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8304 lines
226 KiB
8304 lines
226 KiB
/** @file mdb.c
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* @brief memory-mapped database library
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*
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* A Btree-based database management library modeled loosely on the
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* BerkeleyDB API, but much simplified.
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*/
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/*
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* Copyright 2011-2013 Howard Chu, Symas Corp.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted only as authorized by the OpenLDAP
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* Public License.
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*
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* A copy of this license is available in the file LICENSE in the
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* top-level directory of the distribution or, alternatively, at
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* <http://www.OpenLDAP.org/license.html>.
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*
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* This code is derived from btree.c written by Martin Hedenfalk.
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*
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* Copyright (c) 2009, 2010 Martin Hedenfalk <martin@bzero.se>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#ifndef _GNU_SOURCE
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#define _GNU_SOURCE 1
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#endif
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/param.h>
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#ifdef _WIN32
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#include <windows.h>
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#else
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#include <sys/uio.h>
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#include <sys/mman.h>
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#ifdef HAVE_SYS_FILE_H
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#include <sys/file.h>
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#endif
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#include <fcntl.h>
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#endif
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#include <assert.h>
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#include <errno.h>
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#include <limits.h>
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#include <stddef.h>
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#include <inttypes.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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#include <unistd.h>
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#if !(defined(BYTE_ORDER) || defined(__BYTE_ORDER))
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#include <netinet/in.h>
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#include <resolv.h> /* defines BYTE_ORDER on HPUX and Solaris */
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#endif
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#if defined(__APPLE__) || defined (BSD)
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# define MDB_USE_POSIX_SEM 1
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# define MDB_FDATASYNC fsync
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#elif defined(ANDROID)
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# define MDB_FDATASYNC fsync
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#endif
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#ifndef _WIN32
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#include <pthread.h>
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#ifdef MDB_USE_POSIX_SEM
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#include <semaphore.h>
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#endif
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#endif
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#ifdef USE_VALGRIND
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#include <valgrind/memcheck.h>
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#define VGMEMP_CREATE(h,r,z) VALGRIND_CREATE_MEMPOOL(h,r,z)
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#define VGMEMP_ALLOC(h,a,s) VALGRIND_MEMPOOL_ALLOC(h,a,s)
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#define VGMEMP_FREE(h,a) VALGRIND_MEMPOOL_FREE(h,a)
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#define VGMEMP_DESTROY(h) VALGRIND_DESTROY_MEMPOOL(h)
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#define VGMEMP_DEFINED(a,s) VALGRIND_MAKE_MEM_DEFINED(a,s)
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#else
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#define VGMEMP_CREATE(h,r,z)
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#define VGMEMP_ALLOC(h,a,s)
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#define VGMEMP_FREE(h,a)
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#define VGMEMP_DESTROY(h)
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#define VGMEMP_DEFINED(a,s)
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#endif
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#ifndef BYTE_ORDER
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# if (defined(_LITTLE_ENDIAN) || defined(_BIG_ENDIAN)) && !(defined(_LITTLE_ENDIAN) && defined(_BIG_ENDIAN))
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/* Solaris just defines one or the other */
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# define LITTLE_ENDIAN 1234
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# define BIG_ENDIAN 4321
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# ifdef _LITTLE_ENDIAN
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# define BYTE_ORDER LITTLE_ENDIAN
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# else
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# define BYTE_ORDER BIG_ENDIAN
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# endif
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# else
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# define BYTE_ORDER __BYTE_ORDER
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# endif
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#endif
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#ifndef LITTLE_ENDIAN
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#define LITTLE_ENDIAN __LITTLE_ENDIAN
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#endif
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#ifndef BIG_ENDIAN
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#define BIG_ENDIAN __BIG_ENDIAN
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#endif
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#if defined(__i386) || defined(__x86_64) || defined(_M_IX86)
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#define MISALIGNED_OK 1
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#endif
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#include "lmdb.h"
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#include "midl.h"
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#if (BYTE_ORDER == LITTLE_ENDIAN) == (BYTE_ORDER == BIG_ENDIAN)
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# error "Unknown or unsupported endianness (BYTE_ORDER)"
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#elif (-6 & 5) || CHAR_BIT != 8 || UINT_MAX < 0xffffffff || ULONG_MAX % 0xFFFF
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# error "Two's complement, reasonably sized integer types, please"
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#endif
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/** @defgroup internal MDB Internals
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* @{
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*/
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/** @defgroup compat Windows Compatibility Macros
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* A bunch of macros to minimize the amount of platform-specific ifdefs
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* needed throughout the rest of the code. When the features this library
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* needs are similar enough to POSIX to be hidden in a one-or-two line
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* replacement, this macro approach is used.
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* @{
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*/
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#ifdef _WIN32
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#define MDB_PIDLOCK 0
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#define pthread_t DWORD
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#define pthread_mutex_t HANDLE
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#define pthread_key_t DWORD
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#define pthread_self() GetCurrentThreadId()
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#define pthread_key_create(x,y) \
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((*(x) = TlsAlloc()) == TLS_OUT_OF_INDEXES ? ErrCode() : 0)
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#define pthread_key_delete(x) TlsFree(x)
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#define pthread_getspecific(x) TlsGetValue(x)
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#define pthread_setspecific(x,y) (TlsSetValue(x,y) ? 0 : ErrCode())
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#define pthread_mutex_unlock(x) ReleaseMutex(x)
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#define pthread_mutex_lock(x) WaitForSingleObject(x, INFINITE)
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#define LOCK_MUTEX_R(env) pthread_mutex_lock((env)->me_rmutex)
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#define UNLOCK_MUTEX_R(env) pthread_mutex_unlock((env)->me_rmutex)
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#define LOCK_MUTEX_W(env) pthread_mutex_lock((env)->me_wmutex)
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#define UNLOCK_MUTEX_W(env) pthread_mutex_unlock((env)->me_wmutex)
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#define getpid() GetCurrentProcessId()
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#define MDB_FDATASYNC(fd) (!FlushFileBuffers(fd))
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#define MDB_MSYNC(addr,len,flags) (!FlushViewOfFile(addr,len))
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#define ErrCode() GetLastError()
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#define GET_PAGESIZE(x) {SYSTEM_INFO si; GetSystemInfo(&si); (x) = si.dwPageSize;}
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#define close(fd) (CloseHandle(fd) ? 0 : -1)
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#define munmap(ptr,len) UnmapViewOfFile(ptr)
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#ifdef PROCESS_QUERY_LIMITED_INFORMATION
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#define MDB_PROCESS_QUERY_LIMITED_INFORMATION PROCESS_QUERY_LIMITED_INFORMATION
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#else
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#define MDB_PROCESS_QUERY_LIMITED_INFORMATION 0x1000
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#endif
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#define Z "I"
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#else
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#define Z "z" /**< printf format modifier for size_t */
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/** For MDB_LOCK_FORMAT: True if readers take a pid lock in the lockfile */
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#define MDB_PIDLOCK 1
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#ifdef MDB_USE_POSIX_SEM
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#define LOCK_MUTEX_R(env) mdb_sem_wait((env)->me_rmutex)
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#define UNLOCK_MUTEX_R(env) sem_post((env)->me_rmutex)
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#define LOCK_MUTEX_W(env) mdb_sem_wait((env)->me_wmutex)
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#define UNLOCK_MUTEX_W(env) sem_post((env)->me_wmutex)
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static int
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mdb_sem_wait(sem_t *sem)
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{
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int rc;
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while ((rc = sem_wait(sem)) && (rc = errno) == EINTR) ;
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return rc;
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}
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#else
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/** Lock the reader mutex.
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*/
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#define LOCK_MUTEX_R(env) pthread_mutex_lock(&(env)->me_txns->mti_mutex)
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/** Unlock the reader mutex.
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*/
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#define UNLOCK_MUTEX_R(env) pthread_mutex_unlock(&(env)->me_txns->mti_mutex)
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/** Lock the writer mutex.
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* Only a single write transaction is allowed at a time. Other writers
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* will block waiting for this mutex.
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*/
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#define LOCK_MUTEX_W(env) pthread_mutex_lock(&(env)->me_txns->mti_wmutex)
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/** Unlock the writer mutex.
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*/
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#define UNLOCK_MUTEX_W(env) pthread_mutex_unlock(&(env)->me_txns->mti_wmutex)
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#endif /* MDB_USE_POSIX_SEM */
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/** Get the error code for the last failed system function.
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*/
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#define ErrCode() errno
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/** An abstraction for a file handle.
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* On POSIX systems file handles are small integers. On Windows
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* they're opaque pointers.
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*/
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#define HANDLE int
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/** A value for an invalid file handle.
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* Mainly used to initialize file variables and signify that they are
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* unused.
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*/
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#define INVALID_HANDLE_VALUE (-1)
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/** Get the size of a memory page for the system.
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* This is the basic size that the platform's memory manager uses, and is
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* fundamental to the use of memory-mapped files.
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*/
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#define GET_PAGESIZE(x) ((x) = sysconf(_SC_PAGE_SIZE))
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#endif
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#if defined(_WIN32) || defined(MDB_USE_POSIX_SEM)
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#define MNAME_LEN 32
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#else
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#define MNAME_LEN (sizeof(pthread_mutex_t))
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#endif
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/** @} */
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#ifndef _WIN32
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/** A flag for opening a file and requesting synchronous data writes.
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* This is only used when writing a meta page. It's not strictly needed;
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* we could just do a normal write and then immediately perform a flush.
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* But if this flag is available it saves us an extra system call.
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*
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* @note If O_DSYNC is undefined but exists in /usr/include,
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* preferably set some compiler flag to get the definition.
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* Otherwise compile with the less efficient -DMDB_DSYNC=O_SYNC.
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*/
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#ifndef MDB_DSYNC
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# define MDB_DSYNC O_DSYNC
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#endif
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#endif
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/** Function for flushing the data of a file. Define this to fsync
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* if fdatasync() is not supported.
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*/
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#ifndef MDB_FDATASYNC
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# define MDB_FDATASYNC fdatasync
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#endif
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#ifndef MDB_MSYNC
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# define MDB_MSYNC(addr,len,flags) msync(addr,len,flags)
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#endif
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#ifndef MS_SYNC
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#define MS_SYNC 1
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#endif
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#ifndef MS_ASYNC
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#define MS_ASYNC 0
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#endif
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/** A page number in the database.
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* Note that 64 bit page numbers are overkill, since pages themselves
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* already represent 12-13 bits of addressable memory, and the OS will
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* always limit applications to a maximum of 63 bits of address space.
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*
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* @note In the #MDB_node structure, we only store 48 bits of this value,
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* which thus limits us to only 60 bits of addressable data.
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*/
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typedef MDB_ID pgno_t;
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/** A transaction ID.
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* See struct MDB_txn.mt_txnid for details.
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*/
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typedef MDB_ID txnid_t;
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/** @defgroup debug Debug Macros
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* @{
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*/
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#ifndef MDB_DEBUG
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/** Enable debug output. Needs variable argument macros (a C99 feature).
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* Set this to 1 for copious tracing. Set to 2 to add dumps of all IDLs
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* read from and written to the database (used for free space management).
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*/
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#define MDB_DEBUG 0
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#endif
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#if MDB_DEBUG
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static int mdb_debug;
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static txnid_t mdb_debug_start;
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/** Print a debug message with printf formatting.
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* Requires double parenthesis around 2 or more args.
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*/
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# define DPRINTF(args) ((void) ((mdb_debug) && DPRINTF0 args))
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# define DPRINTF0(fmt, ...) \
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fprintf(stderr, "%s:%d " fmt "\n", __func__, __LINE__, __VA_ARGS__)
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#else
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# define DPRINTF(args) ((void) 0)
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#endif
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/** Print a debug string.
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* The string is printed literally, with no format processing.
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*/
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#define DPUTS(arg) DPRINTF(("%s", arg))
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/** Debuging output value of a cursor DBI: Negative in a sub-cursor. */
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#define DDBI(mc) \
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(((mc)->mc_flags & C_SUB) ? -(int)(mc)->mc_dbi : (int)(mc)->mc_dbi)
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/** @} */
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/** A default memory page size.
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* The actual size is platform-dependent, but we use this for
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* boot-strapping. We probably should not be using this any more.
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* The #GET_PAGESIZE() macro is used to get the actual size.
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*
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* Note that we don't currently support Huge pages. On Linux,
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* regular data files cannot use Huge pages, and in general
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* Huge pages aren't actually pageable. We rely on the OS
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* demand-pager to read our data and page it out when memory
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* pressure from other processes is high. So until OSs have
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* actual paging support for Huge pages, they're not viable.
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*/
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#define MDB_PAGESIZE 4096
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/** The minimum number of keys required in a database page.
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* Setting this to a larger value will place a smaller bound on the
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* maximum size of a data item. Data items larger than this size will
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* be pushed into overflow pages instead of being stored directly in
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* the B-tree node. This value used to default to 4. With a page size
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* of 4096 bytes that meant that any item larger than 1024 bytes would
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* go into an overflow page. That also meant that on average 2-3KB of
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* each overflow page was wasted space. The value cannot be lower than
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* 2 because then there would no longer be a tree structure. With this
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* value, items larger than 2KB will go into overflow pages, and on
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* average only 1KB will be wasted.
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*/
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#define MDB_MINKEYS 2
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/** A stamp that identifies a file as an MDB file.
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* There's nothing special about this value other than that it is easily
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* recognizable, and it will reflect any byte order mismatches.
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*/
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#define MDB_MAGIC 0xBEEFC0DE
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/** The version number for a database's datafile format. */
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#define MDB_DATA_VERSION 1
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/** The version number for a database's lockfile format. */
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#define MDB_LOCK_VERSION 1
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/** @brief The maximum size of a key in the database.
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*
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* The library rejects bigger keys, and cannot deal with records
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* with bigger keys stored by a library with bigger max keysize.
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*
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* We require that keys all fit onto a regular page. This limit
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* could be raised a bit further if needed; to something just
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* under #MDB_PAGESIZE / #MDB_MINKEYS.
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*
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* Note that data items in an #MDB_DUPSORT database are actually keys
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* of a subDB, so they're also limited to this size.
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*/
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#ifndef MDB_MAXKEYSIZE
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#define MDB_MAXKEYSIZE 511
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#endif
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/** @brief The maximum size of a data item.
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*
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* We only store a 32 bit value for node sizes.
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*/
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#define MAXDATASIZE 0xffffffffUL
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#if MDB_DEBUG
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/** A key buffer.
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* @ingroup debug
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* This is used for printing a hex dump of a key's contents.
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*/
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#define DKBUF char kbuf[(MDB_MAXKEYSIZE*2+1)]
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/** Display a key in hex.
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* @ingroup debug
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* Invoke a function to display a key in hex.
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*/
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#define DKEY(x) mdb_dkey(x, kbuf)
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#else
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#define DKBUF
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#define DKEY(x) 0
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#endif
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/** An invalid page number.
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|
* Mainly used to denote an empty tree.
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|
*/
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#define P_INVALID (~(pgno_t)0)
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|
/** Test if the flags \b f are set in a flag word \b w. */
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#define F_ISSET(w, f) (((w) & (f)) == (f))
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|
/** Used for offsets within a single page.
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* Since memory pages are typically 4 or 8KB in size, 12-13 bits,
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* this is plenty.
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*/
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typedef uint16_t indx_t;
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|
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/** Default size of memory map.
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* This is certainly too small for any actual applications. Apps should always set
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* the size explicitly using #mdb_env_set_mapsize().
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*/
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#define DEFAULT_MAPSIZE 1048576
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|
|
/** @defgroup readers Reader Lock Table
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* Readers don't acquire any locks for their data access. Instead, they
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* simply record their transaction ID in the reader table. The reader
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* mutex is needed just to find an empty slot in the reader table. The
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* slot's address is saved in thread-specific data so that subsequent read
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* transactions started by the same thread need no further locking to proceed.
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|
*
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* If #MDB_NOTLS is set, the slot address is not saved in thread-specific data.
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*
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* No reader table is used if the database is on a read-only filesystem, or
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* if #MDB_NOLOCK is set.
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|
*
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|
* Since the database uses multi-version concurrency control, readers don't
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* actually need any locking. This table is used to keep track of which
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* readers are using data from which old transactions, so that we'll know
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* when a particular old transaction is no longer in use. Old transactions
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* that have discarded any data pages can then have those pages reclaimed
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* for use by a later write transaction.
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*
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* The lock table is constructed such that reader slots are aligned with the
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* processor's cache line size. Any slot is only ever used by one thread.
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* This alignment guarantees that there will be no contention or cache
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* thrashing as threads update their own slot info, and also eliminates
|
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* any need for locking when accessing a slot.
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|
*
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* A writer thread will scan every slot in the table to determine the oldest
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* outstanding reader transaction. Any freed pages older than this will be
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* reclaimed by the writer. The writer doesn't use any locks when scanning
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* this table. This means that there's no guarantee that the writer will
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* see the most up-to-date reader info, but that's not required for correct
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* operation - all we need is to know the upper bound on the oldest reader,
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* we don't care at all about the newest reader. So the only consequence of
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* reading stale information here is that old pages might hang around a
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|
* while longer before being reclaimed. That's actually good anyway, because
|
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* the longer we delay reclaiming old pages, the more likely it is that a
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|
* string of contiguous pages can be found after coalescing old pages from
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* many old transactions together.
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|
* @{
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*/
|
|
/** Number of slots in the reader table.
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|
* This value was chosen somewhat arbitrarily. 126 readers plus a
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|
* couple mutexes fit exactly into 8KB on my development machine.
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|
* Applications should set the table size using #mdb_env_set_maxreaders().
|
|
*/
|
|
#define DEFAULT_READERS 126
|
|
|
|
/** The size of a CPU cache line in bytes. We want our lock structures
|
|
* aligned to this size to avoid false cache line sharing in the
|
|
* lock table.
|
|
* This value works for most CPUs. For Itanium this should be 128.
|
|
*/
|
|
#ifndef CACHELINE
|
|
#define CACHELINE 64
|
|
#endif
|
|
|
|
/** The information we store in a single slot of the reader table.
|
|
* In addition to a transaction ID, we also record the process and
|
|
* thread ID that owns a slot, so that we can detect stale information,
|
|
* e.g. threads or processes that went away without cleaning up.
|
|
* @note We currently don't check for stale records. We simply re-init
|
|
* the table when we know that we're the only process opening the
|
|
* lock file.
|
|
*/
|
|
typedef struct MDB_rxbody {
|
|
/** Current Transaction ID when this transaction began, or (txnid_t)-1.
|
|
* Multiple readers that start at the same time will probably have the
|
|
* same ID here. Again, it's not important to exclude them from
|
|
* anything; all we need to know is which version of the DB they
|
|
* started from so we can avoid overwriting any data used in that
|
|
* particular version.
|
|
*/
|
|
txnid_t mrb_txnid;
|
|
/** The process ID of the process owning this reader txn. */
|
|
pid_t mrb_pid;
|
|
/** The thread ID of the thread owning this txn. */
|
|
pthread_t mrb_tid;
|
|
} MDB_rxbody;
|
|
|
|
/** The actual reader record, with cacheline padding. */
|
|
typedef struct MDB_reader {
|
|
union {
|
|
MDB_rxbody mrx;
|
|
/** shorthand for mrb_txnid */
|
|
#define mr_txnid mru.mrx.mrb_txnid
|
|
#define mr_pid mru.mrx.mrb_pid
|
|
#define mr_tid mru.mrx.mrb_tid
|
|
/** cache line alignment */
|
|
char pad[(sizeof(MDB_rxbody)+CACHELINE-1) & ~(CACHELINE-1)];
|
|
} mru;
|
|
} MDB_reader;
|
|
|
|
/** The header for the reader table.
|
|
* The table resides in a memory-mapped file. (This is a different file
|
|
* than is used for the main database.)
|
|
*
|
|
* For POSIX the actual mutexes reside in the shared memory of this
|
|
* mapped file. On Windows, mutexes are named objects allocated by the
|
|
* kernel; we store the mutex names in this mapped file so that other
|
|
* processes can grab them. This same approach is also used on
|
|
* MacOSX/Darwin (using named semaphores) since MacOSX doesn't support
|
|
* process-shared POSIX mutexes. For these cases where a named object
|
|
* is used, the object name is derived from a 64 bit FNV hash of the
|
|
* environment pathname. As such, naming collisions are extremely
|
|
* unlikely. If a collision occurs, the results are unpredictable.
|
|
*/
|
|
typedef struct MDB_txbody {
|
|
/** Stamp identifying this as an MDB file. It must be set
|
|
* to #MDB_MAGIC. */
|
|
uint32_t mtb_magic;
|
|
/** Format of this lock file. Must be set to #MDB_LOCK_FORMAT. */
|
|
uint32_t mtb_format;
|
|
#if defined(_WIN32) || defined(MDB_USE_POSIX_SEM)
|
|
char mtb_rmname[MNAME_LEN];
|
|
#else
|
|
/** Mutex protecting access to this table.
|
|
* This is the reader lock that #LOCK_MUTEX_R acquires.
|
|
*/
|
|
pthread_mutex_t mtb_mutex;
|
|
#endif
|
|
/** The ID of the last transaction committed to the database.
|
|
* This is recorded here only for convenience; the value can always
|
|
* be determined by reading the main database meta pages.
|
|
*/
|
|
txnid_t mtb_txnid;
|
|
/** The number of slots that have been used in the reader table.
|
|
* This always records the maximum count, it is not decremented
|
|
* when readers release their slots.
|
|
*/
|
|
unsigned mtb_numreaders;
|
|
} MDB_txbody;
|
|
|
|
/** The actual reader table definition. */
|
|
typedef struct MDB_txninfo {
|
|
union {
|
|
MDB_txbody mtb;
|
|
#define mti_magic mt1.mtb.mtb_magic
|
|
#define mti_format mt1.mtb.mtb_format
|
|
#define mti_mutex mt1.mtb.mtb_mutex
|
|
#define mti_rmname mt1.mtb.mtb_rmname
|
|
#define mti_txnid mt1.mtb.mtb_txnid
|
|
#define mti_numreaders mt1.mtb.mtb_numreaders
|
|
char pad[(sizeof(MDB_txbody)+CACHELINE-1) & ~(CACHELINE-1)];
|
|
} mt1;
|
|
union {
|
|
#if defined(_WIN32) || defined(MDB_USE_POSIX_SEM)
|
|
char mt2_wmname[MNAME_LEN];
|
|
#define mti_wmname mt2.mt2_wmname
|
|
#else
|
|
pthread_mutex_t mt2_wmutex;
|
|
#define mti_wmutex mt2.mt2_wmutex
|
|
#endif
|
|
char pad[(MNAME_LEN+CACHELINE-1) & ~(CACHELINE-1)];
|
|
} mt2;
|
|
MDB_reader mti_readers[1];
|
|
} MDB_txninfo;
|
|
|
|
/** Lockfile format signature: version, features and field layout */
|
|
#define MDB_LOCK_FORMAT \
|
|
((uint32_t) \
|
|
((MDB_LOCK_VERSION) \
|
|
/* Flags which describe functionality */ \
|
|
+ (((MDB_PIDLOCK) != 0) << 16)))
|
|
/** @} */
|
|
|
|
/** Common header for all page types.
|
|
* Overflow records occupy a number of contiguous pages with no
|
|
* headers on any page after the first.
|
|
*/
|
|
typedef struct MDB_page {
|
|
#define mp_pgno mp_p.p_pgno
|
|
#define mp_next mp_p.p_next
|
|
union {
|
|
pgno_t p_pgno; /**< page number */
|
|
void * p_next; /**< for in-memory list of freed structs */
|
|
} mp_p;
|
|
uint16_t mp_pad;
|
|
/** @defgroup mdb_page Page Flags
|
|
* @ingroup internal
|
|
* Flags for the page headers.
|
|
* @{
|
|
*/
|
|
#define P_BRANCH 0x01 /**< branch page */
|
|
#define P_LEAF 0x02 /**< leaf page */
|
|
#define P_OVERFLOW 0x04 /**< overflow page */
|
|
#define P_META 0x08 /**< meta page */
|
|
#define P_DIRTY 0x10 /**< dirty page, also set for #P_SUBP pages */
|
|
#define P_LEAF2 0x20 /**< for #MDB_DUPFIXED records */
|
|
#define P_SUBP 0x40 /**< for #MDB_DUPSORT sub-pages */
|
|
#define P_KEEP 0x8000 /**< leave this page alone during spill */
|
|
/** @} */
|
|
uint16_t mp_flags; /**< @ref mdb_page */
|
|
#define mp_lower mp_pb.pb.pb_lower
|
|
#define mp_upper mp_pb.pb.pb_upper
|
|
#define mp_pages mp_pb.pb_pages
|
|
union {
|
|
struct {
|
|
indx_t pb_lower; /**< lower bound of free space */
|
|
indx_t pb_upper; /**< upper bound of free space */
|
|
} pb;
|
|
uint32_t pb_pages; /**< number of overflow pages */
|
|
} mp_pb;
|
|
indx_t mp_ptrs[1]; /**< dynamic size */
|
|
} MDB_page;
|
|
|
|
/** Size of the page header, excluding dynamic data at the end */
|
|
#define PAGEHDRSZ ((unsigned) offsetof(MDB_page, mp_ptrs))
|
|
|
|
/** Address of first usable data byte in a page, after the header */
|
|
#define METADATA(p) ((void *)((char *)(p) + PAGEHDRSZ))
|
|
|
|
/** Number of nodes on a page */
|
|
#define NUMKEYS(p) (((p)->mp_lower - PAGEHDRSZ) >> 1)
|
|
|
|
/** The amount of space remaining in the page */
|
|
#define SIZELEFT(p) (indx_t)((p)->mp_upper - (p)->mp_lower)
|
|
|
|
/** The percentage of space used in the page, in tenths of a percent. */
|
|
#define PAGEFILL(env, p) (1000L * ((env)->me_psize - PAGEHDRSZ - SIZELEFT(p)) / \
|
|
((env)->me_psize - PAGEHDRSZ))
|
|
/** The minimum page fill factor, in tenths of a percent.
|
|
* Pages emptier than this are candidates for merging.
|
|
*/
|
|
#define FILL_THRESHOLD 250
|
|
|
|
/** Test if a page is a leaf page */
|
|
#define IS_LEAF(p) F_ISSET((p)->mp_flags, P_LEAF)
|
|
/** Test if a page is a LEAF2 page */
|
|
#define IS_LEAF2(p) F_ISSET((p)->mp_flags, P_LEAF2)
|
|
/** Test if a page is a branch page */
|
|
#define IS_BRANCH(p) F_ISSET((p)->mp_flags, P_BRANCH)
|
|
/** Test if a page is an overflow page */
|
|
#define IS_OVERFLOW(p) F_ISSET((p)->mp_flags, P_OVERFLOW)
|
|
/** Test if a page is a sub page */
|
|
#define IS_SUBP(p) F_ISSET((p)->mp_flags, P_SUBP)
|
|
|
|
/** The number of overflow pages needed to store the given size. */
|
|
#define OVPAGES(size, psize) ((PAGEHDRSZ-1 + (size)) / (psize) + 1)
|
|
|
|
/** Header for a single key/data pair within a page.
|
|
* We guarantee 2-byte alignment for nodes.
|
|
*/
|
|
typedef struct MDB_node {
|
|
/** lo and hi are used for data size on leaf nodes and for
|
|
* child pgno on branch nodes. On 64 bit platforms, flags
|
|
* is also used for pgno. (Branch nodes have no flags).
|
|
* They are in host byte order in case that lets some
|
|
* accesses be optimized into a 32-bit word access.
|
|
*/
|
|
#define mn_lo mn_offset[BYTE_ORDER!=LITTLE_ENDIAN]
|
|
#define mn_hi mn_offset[BYTE_ORDER==LITTLE_ENDIAN] /**< part of dsize or pgno */
|
|
unsigned short mn_offset[2]; /**< storage for #mn_lo and #mn_hi */
|
|
/** @defgroup mdb_node Node Flags
|
|
* @ingroup internal
|
|
* Flags for node headers.
|
|
* @{
|
|
*/
|
|
#define F_BIGDATA 0x01 /**< data put on overflow page */
|
|
#define F_SUBDATA 0x02 /**< data is a sub-database */
|
|
#define F_DUPDATA 0x04 /**< data has duplicates */
|
|
|
|
/** valid flags for #mdb_node_add() */
|
|
#define NODE_ADD_FLAGS (F_DUPDATA|F_SUBDATA|MDB_RESERVE|MDB_APPEND)
|
|
|
|
/** @} */
|
|
unsigned short mn_flags; /**< @ref mdb_node */
|
|
unsigned short mn_ksize; /**< key size */
|
|
char mn_data[1]; /**< key and data are appended here */
|
|
} MDB_node;
|
|
|
|
/** Size of the node header, excluding dynamic data at the end */
|
|
#define NODESIZE offsetof(MDB_node, mn_data)
|
|
|
|
/** Bit position of top word in page number, for shifting mn_flags */
|
|
#define PGNO_TOPWORD ((pgno_t)-1 > 0xffffffffu ? 32 : 0)
|
|
|
|
/** Size of a node in a branch page with a given key.
|
|
* This is just the node header plus the key, there is no data.
|
|
*/
|
|
#define INDXSIZE(k) (NODESIZE + ((k) == NULL ? 0 : (k)->mv_size))
|
|
|
|
/** Size of a node in a leaf page with a given key and data.
|
|
* This is node header plus key plus data size.
|
|
*/
|
|
#define LEAFSIZE(k, d) (NODESIZE + (k)->mv_size + (d)->mv_size)
|
|
|
|
/** Address of node \b i in page \b p */
|
|
#define NODEPTR(p, i) ((MDB_node *)((char *)(p) + (p)->mp_ptrs[i]))
|
|
|
|
/** Address of the key for the node */
|
|
#define NODEKEY(node) (void *)((node)->mn_data)
|
|
|
|
/** Address of the data for a node */
|
|
#define NODEDATA(node) (void *)((char *)(node)->mn_data + (node)->mn_ksize)
|
|
|
|
/** Get the page number pointed to by a branch node */
|
|
#define NODEPGNO(node) \
|
|
((node)->mn_lo | ((pgno_t) (node)->mn_hi << 16) | \
|
|
(PGNO_TOPWORD ? ((pgno_t) (node)->mn_flags << PGNO_TOPWORD) : 0))
|
|
/** Set the page number in a branch node */
|
|
#define SETPGNO(node,pgno) do { \
|
|
(node)->mn_lo = (pgno) & 0xffff; (node)->mn_hi = (pgno) >> 16; \
|
|
if (PGNO_TOPWORD) (node)->mn_flags = (pgno) >> PGNO_TOPWORD; } while(0)
|
|
|
|
/** Get the size of the data in a leaf node */
|
|
#define NODEDSZ(node) ((node)->mn_lo | ((unsigned)(node)->mn_hi << 16))
|
|
/** Set the size of the data for a leaf node */
|
|
#define SETDSZ(node,size) do { \
|
|
(node)->mn_lo = (size) & 0xffff; (node)->mn_hi = (size) >> 16;} while(0)
|
|
/** The size of a key in a node */
|
|
#define NODEKSZ(node) ((node)->mn_ksize)
|
|
|
|
/** Copy a page number from src to dst */
|
|
#ifdef MISALIGNED_OK
|
|
#define COPY_PGNO(dst,src) dst = src
|
|
#else
|
|
#if SIZE_MAX > 4294967295UL
|
|
#define COPY_PGNO(dst,src) do { \
|
|
unsigned short *s, *d; \
|
|
s = (unsigned short *)&(src); \
|
|
d = (unsigned short *)&(dst); \
|
|
*d++ = *s++; \
|
|
*d++ = *s++; \
|
|
*d++ = *s++; \
|
|
*d = *s; \
|
|
} while (0)
|
|
#else
|
|
#define COPY_PGNO(dst,src) do { \
|
|
unsigned short *s, *d; \
|
|
s = (unsigned short *)&(src); \
|
|
d = (unsigned short *)&(dst); \
|
|
*d++ = *s++; \
|
|
*d = *s; \
|
|
} while (0)
|
|
#endif
|
|
#endif
|
|
/** The address of a key in a LEAF2 page.
|
|
* LEAF2 pages are used for #MDB_DUPFIXED sorted-duplicate sub-DBs.
|
|
* There are no node headers, keys are stored contiguously.
|
|
*/
|
|
#define LEAF2KEY(p, i, ks) ((char *)(p) + PAGEHDRSZ + ((i)*(ks)))
|
|
|
|
/** Set the \b node's key into \b keyptr, if requested. */
|
|
#define MDB_GET_KEY(node, keyptr) { if ((keyptr) != NULL) { \
|
|
(keyptr)->mv_size = NODEKSZ(node); (keyptr)->mv_data = NODEKEY(node); } }
|
|
|
|
/** Set the \b node's key into \b key. */
|
|
#define MDB_GET_KEY2(node, key) { key.mv_size = NODEKSZ(node); key.mv_data = NODEKEY(node); }
|
|
|
|
/** Information about a single database in the environment. */
|
|
typedef struct MDB_db {
|
|
uint32_t md_pad; /**< also ksize for LEAF2 pages */
|
|
uint16_t md_flags; /**< @ref mdb_dbi_open */
|
|
uint16_t md_depth; /**< depth of this tree */
|
|
pgno_t md_branch_pages; /**< number of internal pages */
|
|
pgno_t md_leaf_pages; /**< number of leaf pages */
|
|
pgno_t md_overflow_pages; /**< number of overflow pages */
|
|
size_t md_entries; /**< number of data items */
|
|
pgno_t md_root; /**< the root page of this tree */
|
|
} MDB_db;
|
|
|
|
/** mdb_dbi_open flags */
|
|
#define MDB_VALID 0x8000 /**< DB handle is valid, for me_dbflags */
|
|
#define PERSISTENT_FLAGS (0xffff & ~(MDB_VALID))
|
|
#define VALID_FLAGS (MDB_REVERSEKEY|MDB_DUPSORT|MDB_INTEGERKEY|MDB_DUPFIXED|\
|
|
MDB_INTEGERDUP|MDB_REVERSEDUP|MDB_CREATE)
|
|
|
|
/** Handle for the DB used to track free pages. */
|
|
#define FREE_DBI 0
|
|
/** Handle for the default DB. */
|
|
#define MAIN_DBI 1
|
|
|
|
/** Meta page content.
|
|
* A meta page is the start point for accessing a database snapshot.
|
|
* Pages 0-1 are meta pages. Transaction N writes meta page #(N % 2).
|
|
*/
|
|
typedef struct MDB_meta {
|
|
/** Stamp identifying this as an MDB file. It must be set
|
|
* to #MDB_MAGIC. */
|
|
uint32_t mm_magic;
|
|
/** Version number of this lock file. Must be set to #MDB_DATA_VERSION. */
|
|
uint32_t mm_version;
|
|
void *mm_address; /**< address for fixed mapping */
|
|
size_t mm_mapsize; /**< size of mmap region */
|
|
MDB_db mm_dbs[2]; /**< first is free space, 2nd is main db */
|
|
/** The size of pages used in this DB */
|
|
#define mm_psize mm_dbs[0].md_pad
|
|
/** Any persistent environment flags. @ref mdb_env */
|
|
#define mm_flags mm_dbs[0].md_flags
|
|
pgno_t mm_last_pg; /**< last used page in file */
|
|
txnid_t mm_txnid; /**< txnid that committed this page */
|
|
} MDB_meta;
|
|
|
|
/** Buffer for a stack-allocated dirty page.
|
|
* The members define size and alignment, and silence type
|
|
* aliasing warnings. They are not used directly; that could
|
|
* mean incorrectly using several union members in parallel.
|
|
*/
|
|
typedef union MDB_pagebuf {
|
|
char mb_raw[MDB_PAGESIZE];
|
|
MDB_page mb_page;
|
|
struct {
|
|
char mm_pad[PAGEHDRSZ];
|
|
MDB_meta mm_meta;
|
|
} mb_metabuf;
|
|
} MDB_pagebuf;
|
|
|
|
/** Auxiliary DB info.
|
|
* The information here is mostly static/read-only. There is
|
|
* only a single copy of this record in the environment.
|
|
*/
|
|
typedef struct MDB_dbx {
|
|
MDB_val md_name; /**< name of the database */
|
|
MDB_cmp_func *md_cmp; /**< function for comparing keys */
|
|
MDB_cmp_func *md_dcmp; /**< function for comparing data items */
|
|
MDB_rel_func *md_rel; /**< user relocate function */
|
|
void *md_relctx; /**< user-provided context for md_rel */
|
|
} MDB_dbx;
|
|
|
|
/** A database transaction.
|
|
* Every operation requires a transaction handle.
|
|
*/
|
|
struct MDB_txn {
|
|
MDB_txn *mt_parent; /**< parent of a nested txn */
|
|
MDB_txn *mt_child; /**< nested txn under this txn */
|
|
pgno_t mt_next_pgno; /**< next unallocated page */
|
|
/** The ID of this transaction. IDs are integers incrementing from 1.
|
|
* Only committed write transactions increment the ID. If a transaction
|
|
* aborts, the ID may be re-used by the next writer.
|
|
*/
|
|
txnid_t mt_txnid;
|
|
MDB_env *mt_env; /**< the DB environment */
|
|
/** The list of pages that became unused during this transaction.
|
|
*/
|
|
MDB_IDL mt_free_pgs;
|
|
/** The sorted list of dirty pages we temporarily wrote to disk
|
|
* because the dirty list was full. page numbers in here are
|
|
* shifted left by 1, deleted slots have the LSB set.
|
|
*/
|
|
MDB_IDL mt_spill_pgs;
|
|
union {
|
|
/** For write txns: Modified pages. Sorted when not MDB_WRITEMAP. */
|
|
MDB_ID2L dirty_list;
|
|
/** For read txns: This thread/txn's reader table slot, or NULL. */
|
|
MDB_reader *reader;
|
|
} mt_u;
|
|
/** Array of records for each DB known in the environment. */
|
|
MDB_dbx *mt_dbxs;
|
|
/** Array of MDB_db records for each known DB */
|
|
MDB_db *mt_dbs;
|
|
/** @defgroup mt_dbflag Transaction DB Flags
|
|
* @ingroup internal
|
|
* @{
|
|
*/
|
|
#define DB_DIRTY 0x01 /**< DB was modified or is DUPSORT data */
|
|
#define DB_STALE 0x02 /**< Named-DB record is older than txnID */
|
|
#define DB_NEW 0x04 /**< Named-DB handle opened in this txn */
|
|
#define DB_VALID 0x08 /**< DB handle is valid, see also #MDB_VALID */
|
|
/** @} */
|
|
/** In write txns, array of cursors for each DB */
|
|
MDB_cursor **mt_cursors;
|
|
/** Array of flags for each DB */
|
|
unsigned char *mt_dbflags;
|
|
/** Number of DB records in use. This number only ever increments;
|
|
* we don't decrement it when individual DB handles are closed.
|
|
*/
|
|
MDB_dbi mt_numdbs;
|
|
|
|
/** @defgroup mdb_txn Transaction Flags
|
|
* @ingroup internal
|
|
* @{
|
|
*/
|
|
#define MDB_TXN_RDONLY 0x01 /**< read-only transaction */
|
|
#define MDB_TXN_ERROR 0x02 /**< an error has occurred */
|
|
#define MDB_TXN_DIRTY 0x04 /**< must write, even if dirty list is empty */
|
|
#define MDB_TXN_SPILLS 0x08 /**< txn or a parent has spilled pages */
|
|
/** @} */
|
|
unsigned int mt_flags; /**< @ref mdb_txn */
|
|
/** dirty_list room: Array size - #dirty pages visible to this txn.
|
|
* Includes ancestor txns' dirty pages not hidden by other txns'
|
|
* dirty/spilled pages. Thus commit(nested txn) has room to merge
|
|
* dirty_list into mt_parent after freeing hidden mt_parent pages.
|
|
*/
|
|
unsigned int mt_dirty_room;
|
|
};
|
|
|
|
/** Enough space for 2^32 nodes with minimum of 2 keys per node. I.e., plenty.
|
|
* At 4 keys per node, enough for 2^64 nodes, so there's probably no need to
|
|
* raise this on a 64 bit machine.
|
|
*/
|
|
#define CURSOR_STACK 32
|
|
|
|
struct MDB_xcursor;
|
|
|
|
/** Cursors are used for all DB operations.
|
|
* A cursor holds a path of (page pointer, key index) from the DB
|
|
* root to a position in the DB, plus other state. #MDB_DUPSORT
|
|
* cursors include an xcursor to the current data item. Write txns
|
|
* track their cursors and keep them up to date when data moves.
|
|
* Exception: An xcursor's pointer to a #P_SUBP page can be stale.
|
|
* (A node with #F_DUPDATA but no #F_SUBDATA contains a subpage).
|
|
*/
|
|
struct MDB_cursor {
|
|
/** Next cursor on this DB in this txn */
|
|
MDB_cursor *mc_next;
|
|
/** Backup of the original cursor if this cursor is a shadow */
|
|
MDB_cursor *mc_backup;
|
|
/** Context used for databases with #MDB_DUPSORT, otherwise NULL */
|
|
struct MDB_xcursor *mc_xcursor;
|
|
/** The transaction that owns this cursor */
|
|
MDB_txn *mc_txn;
|
|
/** The database handle this cursor operates on */
|
|
MDB_dbi mc_dbi;
|
|
/** The database record for this cursor */
|
|
MDB_db *mc_db;
|
|
/** The database auxiliary record for this cursor */
|
|
MDB_dbx *mc_dbx;
|
|
/** The @ref mt_dbflag for this database */
|
|
unsigned char *mc_dbflag;
|
|
unsigned short mc_snum; /**< number of pushed pages */
|
|
unsigned short mc_top; /**< index of top page, normally mc_snum-1 */
|
|
/** @defgroup mdb_cursor Cursor Flags
|
|
* @ingroup internal
|
|
* Cursor state flags.
|
|
* @{
|
|
*/
|
|
#define C_INITIALIZED 0x01 /**< cursor has been initialized and is valid */
|
|
#define C_EOF 0x02 /**< No more data */
|
|
#define C_SUB 0x04 /**< Cursor is a sub-cursor */
|
|
#define C_DEL 0x08 /**< last op was a cursor_del */
|
|
#define C_SPLITTING 0x20 /**< Cursor is in page_split */
|
|
#define C_UNTRACK 0x40 /**< Un-track cursor when closing */
|
|
/** @} */
|
|
unsigned int mc_flags; /**< @ref mdb_cursor */
|
|
MDB_page *mc_pg[CURSOR_STACK]; /**< stack of pushed pages */
|
|
indx_t mc_ki[CURSOR_STACK]; /**< stack of page indices */
|
|
};
|
|
|
|
/** Context for sorted-dup records.
|
|
* We could have gone to a fully recursive design, with arbitrarily
|
|
* deep nesting of sub-databases. But for now we only handle these
|
|
* levels - main DB, optional sub-DB, sorted-duplicate DB.
|
|
*/
|
|
typedef struct MDB_xcursor {
|
|
/** A sub-cursor for traversing the Dup DB */
|
|
MDB_cursor mx_cursor;
|
|
/** The database record for this Dup DB */
|
|
MDB_db mx_db;
|
|
/** The auxiliary DB record for this Dup DB */
|
|
MDB_dbx mx_dbx;
|
|
/** The @ref mt_dbflag for this Dup DB */
|
|
unsigned char mx_dbflag;
|
|
} MDB_xcursor;
|
|
|
|
/** State of FreeDB old pages, stored in the MDB_env */
|
|
typedef struct MDB_pgstate {
|
|
pgno_t *mf_pghead; /**< Reclaimed freeDB pages, or NULL before use */
|
|
txnid_t mf_pglast; /**< ID of last used record, or 0 if !mf_pghead */
|
|
} MDB_pgstate;
|
|
|
|
/** The database environment. */
|
|
struct MDB_env {
|
|
HANDLE me_fd; /**< The main data file */
|
|
HANDLE me_lfd; /**< The lock file */
|
|
HANDLE me_mfd; /**< just for writing the meta pages */
|
|
/** Failed to update the meta page. Probably an I/O error. */
|
|
#define MDB_FATAL_ERROR 0x80000000U
|
|
/** Some fields are initialized. */
|
|
#define MDB_ENV_ACTIVE 0x20000000U
|
|
/** me_txkey is set */
|
|
#define MDB_ENV_TXKEY 0x10000000U
|
|
/** Have liveness lock in reader table */
|
|
#define MDB_LIVE_READER 0x08000000U
|
|
uint32_t me_flags; /**< @ref mdb_env */
|
|
unsigned int me_psize; /**< size of a page, from #GET_PAGESIZE */
|
|
unsigned int me_maxreaders; /**< size of the reader table */
|
|
unsigned int me_numreaders; /**< max numreaders set by this env */
|
|
MDB_dbi me_numdbs; /**< number of DBs opened */
|
|
MDB_dbi me_maxdbs; /**< size of the DB table */
|
|
pid_t me_pid; /**< process ID of this env */
|
|
char *me_path; /**< path to the DB files */
|
|
char *me_map; /**< the memory map of the data file */
|
|
MDB_txninfo *me_txns; /**< the memory map of the lock file or NULL */
|
|
MDB_meta *me_metas[2]; /**< pointers to the two meta pages */
|
|
MDB_txn *me_txn; /**< current write transaction */
|
|
size_t me_mapsize; /**< size of the data memory map */
|
|
off_t me_size; /**< current file size */
|
|
pgno_t me_maxpg; /**< me_mapsize / me_psize */
|
|
MDB_dbx *me_dbxs; /**< array of static DB info */
|
|
uint16_t *me_dbflags; /**< array of flags from MDB_db.md_flags */
|
|
pthread_key_t me_txkey; /**< thread-key for readers */
|
|
MDB_pgstate me_pgstate; /**< state of old pages from freeDB */
|
|
# define me_pglast me_pgstate.mf_pglast
|
|
# define me_pghead me_pgstate.mf_pghead
|
|
MDB_page *me_dpages; /**< list of malloc'd blocks for re-use */
|
|
/** IDL of pages that became unused in a write txn */
|
|
MDB_IDL me_free_pgs;
|
|
/** ID2L of pages written during a write txn. Length MDB_IDL_UM_SIZE. */
|
|
MDB_ID2L me_dirty_list;
|
|
/** Max number of freelist items that can fit in a single overflow page */
|
|
int me_maxfree_1pg;
|
|
/** Max size of a node on a page */
|
|
unsigned int me_nodemax;
|
|
#ifdef _WIN32
|
|
int me_pidquery; /**< Used in OpenProcess */
|
|
HANDLE me_rmutex; /* Windows mutexes don't reside in shared mem */
|
|
HANDLE me_wmutex;
|
|
#elif defined(MDB_USE_POSIX_SEM)
|
|
sem_t *me_rmutex; /* Shared mutexes are not supported */
|
|
sem_t *me_wmutex;
|
|
#endif
|
|
};
|
|
|
|
/** Nested transaction */
|
|
typedef struct MDB_ntxn {
|
|
MDB_txn mnt_txn; /**< the transaction */
|
|
MDB_pgstate mnt_pgstate; /**< parent transaction's saved freestate */
|
|
} MDB_ntxn;
|
|
|
|
/** max number of pages to commit in one writev() call */
|
|
#define MDB_COMMIT_PAGES 64
|
|
#if defined(IOV_MAX) && IOV_MAX < MDB_COMMIT_PAGES
|
|
#undef MDB_COMMIT_PAGES
|
|
#define MDB_COMMIT_PAGES IOV_MAX
|
|
#endif
|
|
|
|
/* max bytes to write in one call */
|
|
#define MAX_WRITE (0x80000000U >> (sizeof(ssize_t) == 4))
|
|
|
|
static int mdb_page_alloc(MDB_cursor *mc, int num, MDB_page **mp);
|
|
static int mdb_page_new(MDB_cursor *mc, uint32_t flags, int num, MDB_page **mp);
|
|
static int mdb_page_touch(MDB_cursor *mc);
|
|
|
|
static int mdb_page_get(MDB_txn *txn, pgno_t pgno, MDB_page **mp, int *lvl);
|
|
static int mdb_page_search_root(MDB_cursor *mc,
|
|
MDB_val *key, int modify);
|
|
#define MDB_PS_MODIFY 1
|
|
#define MDB_PS_ROOTONLY 2
|
|
#define MDB_PS_FIRST 4
|
|
#define MDB_PS_LAST 8
|
|
static int mdb_page_search(MDB_cursor *mc,
|
|
MDB_val *key, int flags);
|
|
static int mdb_page_merge(MDB_cursor *csrc, MDB_cursor *cdst);
|
|
|
|
#define MDB_SPLIT_REPLACE MDB_APPENDDUP /**< newkey is not new */
|
|
static int mdb_page_split(MDB_cursor *mc, MDB_val *newkey, MDB_val *newdata,
|
|
pgno_t newpgno, unsigned int nflags);
|
|
|
|
static int mdb_env_read_header(MDB_env *env, MDB_meta *meta);
|
|
static int mdb_env_pick_meta(const MDB_env *env);
|
|
static int mdb_env_write_meta(MDB_txn *txn);
|
|
#if !(defined(_WIN32) || defined(MDB_USE_POSIX_SEM)) /* Drop unused excl arg */
|
|
# define mdb_env_close0(env, excl) mdb_env_close1(env)
|
|
#endif
|
|
static void mdb_env_close0(MDB_env *env, int excl);
|
|
|
|
static MDB_node *mdb_node_search(MDB_cursor *mc, MDB_val *key, int *exactp);
|
|
static int mdb_node_add(MDB_cursor *mc, indx_t indx,
|
|
MDB_val *key, MDB_val *data, pgno_t pgno, unsigned int flags);
|
|
static void mdb_node_del(MDB_page *mp, indx_t indx, int ksize);
|
|
static void mdb_node_shrink(MDB_page *mp, indx_t indx);
|
|
static int mdb_node_move(MDB_cursor *csrc, MDB_cursor *cdst);
|
|
static int mdb_node_read(MDB_txn *txn, MDB_node *leaf, MDB_val *data);
|
|
static size_t mdb_leaf_size(MDB_env *env, MDB_val *key, MDB_val *data);
|
|
static size_t mdb_branch_size(MDB_env *env, MDB_val *key);
|
|
|
|
static int mdb_rebalance(MDB_cursor *mc);
|
|
static int mdb_update_key(MDB_cursor *mc, MDB_val *key);
|
|
|
|
static void mdb_cursor_pop(MDB_cursor *mc);
|
|
static int mdb_cursor_push(MDB_cursor *mc, MDB_page *mp);
|
|
|
|
static int mdb_cursor_del0(MDB_cursor *mc, MDB_node *leaf);
|
|
static int mdb_cursor_sibling(MDB_cursor *mc, int move_right);
|
|
static int mdb_cursor_next(MDB_cursor *mc, MDB_val *key, MDB_val *data, MDB_cursor_op op);
|
|
static int mdb_cursor_prev(MDB_cursor *mc, MDB_val *key, MDB_val *data, MDB_cursor_op op);
|
|
static int mdb_cursor_set(MDB_cursor *mc, MDB_val *key, MDB_val *data, MDB_cursor_op op,
|
|
int *exactp);
|
|
static int mdb_cursor_first(MDB_cursor *mc, MDB_val *key, MDB_val *data);
|
|
static int mdb_cursor_last(MDB_cursor *mc, MDB_val *key, MDB_val *data);
|
|
|
|
static void mdb_cursor_init(MDB_cursor *mc, MDB_txn *txn, MDB_dbi dbi, MDB_xcursor *mx);
|
|
static void mdb_xcursor_init0(MDB_cursor *mc);
|
|
static void mdb_xcursor_init1(MDB_cursor *mc, MDB_node *node);
|
|
|
|
static int mdb_drop0(MDB_cursor *mc, int subs);
|
|
static void mdb_default_cmp(MDB_txn *txn, MDB_dbi dbi);
|
|
|
|
/** @cond */
|
|
static MDB_cmp_func mdb_cmp_memn, mdb_cmp_memnr, mdb_cmp_int, mdb_cmp_cint, mdb_cmp_long;
|
|
/** @endcond */
|
|
|
|
#ifdef _WIN32
|
|
static SECURITY_DESCRIPTOR mdb_null_sd;
|
|
static SECURITY_ATTRIBUTES mdb_all_sa;
|
|
static int mdb_sec_inited;
|
|
#endif
|
|
|
|
/** Return the library version info. */
|
|
char *
|
|
mdb_version(int *major, int *minor, int *patch)
|
|
{
|
|
if (major) *major = MDB_VERSION_MAJOR;
|
|
if (minor) *minor = MDB_VERSION_MINOR;
|
|
if (patch) *patch = MDB_VERSION_PATCH;
|
|
return MDB_VERSION_STRING;
|
|
}
|
|
|
|
/** Table of descriptions for MDB @ref errors */
|
|
static char *const mdb_errstr[] = {
|
|
"MDB_KEYEXIST: Key/data pair already exists",
|
|
"MDB_NOTFOUND: No matching key/data pair found",
|
|
"MDB_PAGE_NOTFOUND: Requested page not found",
|
|
"MDB_CORRUPTED: Located page was wrong type",
|
|
"MDB_PANIC: Update of meta page failed",
|
|
"MDB_VERSION_MISMATCH: Database environment version mismatch",
|
|
"MDB_INVALID: File is not an MDB file",
|
|
"MDB_MAP_FULL: Environment mapsize limit reached",
|
|
"MDB_DBS_FULL: Environment maxdbs limit reached",
|
|
"MDB_READERS_FULL: Environment maxreaders limit reached",
|
|
"MDB_TLS_FULL: Thread-local storage keys full - too many environments open",
|
|
"MDB_TXN_FULL: Transaction has too many dirty pages - transaction too big",
|
|
"MDB_CURSOR_FULL: Internal error - cursor stack limit reached",
|
|
"MDB_PAGE_FULL: Internal error - page has no more space",
|
|
"MDB_MAP_RESIZED: Database contents grew beyond environment mapsize",
|
|
"MDB_INCOMPATIBLE: Operation and DB incompatible, or DB flags changed",
|
|
"MDB_BAD_RSLOT: Invalid reuse of reader locktable slot",
|
|
"MDB_BAD_TXN: Transaction cannot recover - it must be aborted",
|
|
"MDB_BAD_VALSIZE: Too big key/data, key is empty, or wrong DUPFIXED size",
|
|
};
|
|
|
|
char *
|
|
mdb_strerror(int err)
|
|
{
|
|
int i;
|
|
if (!err)
|
|
return ("Successful return: 0");
|
|
|
|
if (err >= MDB_KEYEXIST && err <= MDB_LAST_ERRCODE) {
|
|
i = err - MDB_KEYEXIST;
|
|
return mdb_errstr[i];
|
|
}
|
|
|
|
return strerror(err);
|
|
}
|
|
|
|
#if MDB_DEBUG
|
|
/** Display a key in hexadecimal and return the address of the result.
|
|
* @param[in] key the key to display
|
|
* @param[in] buf the buffer to write into. Should always be #DKBUF.
|
|
* @return The key in hexadecimal form.
|
|
*/
|
|
char *
|
|
mdb_dkey(MDB_val *key, char *buf)
|
|
{
|
|
char *ptr = buf;
|
|
unsigned char *c = key->mv_data;
|
|
unsigned int i;
|
|
|
|
if (!key)
|
|
return "";
|
|
|
|
if (key->mv_size > MDB_MAXKEYSIZE)
|
|
return "MDB_MAXKEYSIZE";
|
|
/* may want to make this a dynamic check: if the key is mostly
|
|
* printable characters, print it as-is instead of converting to hex.
|
|
*/
|
|
#if 1
|
|
buf[0] = '\0';
|
|
for (i=0; i<key->mv_size; i++)
|
|
ptr += sprintf(ptr, "%02x", *c++);
|
|
#else
|
|
sprintf(buf, "%.*s", key->mv_size, key->mv_data);
|
|
#endif
|
|
return buf;
|
|
}
|
|
|
|
/** Display all the keys in the page. */
|
|
void
|
|
mdb_page_list(MDB_page *mp)
|
|
{
|
|
MDB_node *node;
|
|
unsigned int i, nkeys, nsize;
|
|
MDB_val key;
|
|
DKBUF;
|
|
|
|
nkeys = NUMKEYS(mp);
|
|
fprintf(stderr, "Page %"Z"u numkeys %d\n", mp->mp_pgno, nkeys);
|
|
for (i=0; i<nkeys; i++) {
|
|
node = NODEPTR(mp, i);
|
|
key.mv_size = node->mn_ksize;
|
|
key.mv_data = node->mn_data;
|
|
nsize = NODESIZE + NODEKSZ(node) + sizeof(indx_t);
|
|
if (IS_BRANCH(mp)) {
|
|
fprintf(stderr, "key %d: page %"Z"u, %s\n", i, NODEPGNO(node),
|
|
DKEY(&key));
|
|
} else {
|
|
if (F_ISSET(node->mn_flags, F_BIGDATA))
|
|
nsize += sizeof(pgno_t);
|
|
else
|
|
nsize += NODEDSZ(node);
|
|
fprintf(stderr, "key %d: nsize %d, %s\n", i, nsize, DKEY(&key));
|
|
}
|
|
}
|
|
}
|
|
|
|
void
|
|
mdb_cursor_chk(MDB_cursor *mc)
|
|
{
|
|
unsigned int i;
|
|
MDB_node *node;
|
|
MDB_page *mp;
|
|
|
|
if (!mc->mc_snum && !(mc->mc_flags & C_INITIALIZED)) return;
|
|
for (i=0; i<mc->mc_top; i++) {
|
|
mp = mc->mc_pg[i];
|
|
node = NODEPTR(mp, mc->mc_ki[i]);
|
|
if (NODEPGNO(node) != mc->mc_pg[i+1]->mp_pgno)
|
|
printf("oops!\n");
|
|
}
|
|
if (mc->mc_ki[i] >= NUMKEYS(mc->mc_pg[i]))
|
|
printf("ack!\n");
|
|
}
|
|
#endif
|
|
|
|
#if (MDB_DEBUG) > 2
|
|
/** Count all the pages in each DB and in the freelist
|
|
* and make sure it matches the actual number of pages
|
|
* being used.
|
|
*/
|
|
static void mdb_audit(MDB_txn *txn)
|
|
{
|
|
MDB_cursor mc;
|
|
MDB_val key, data;
|
|
MDB_ID freecount, count;
|
|
MDB_dbi i;
|
|
int rc;
|
|
|
|
freecount = 0;
|
|
mdb_cursor_init(&mc, txn, FREE_DBI, NULL);
|
|
while ((rc = mdb_cursor_get(&mc, &key, &data, MDB_NEXT)) == 0)
|
|
freecount += *(MDB_ID *)data.mv_data;
|
|
|
|
count = 0;
|
|
for (i = 0; i<txn->mt_numdbs; i++) {
|
|
MDB_xcursor mx;
|
|
mdb_cursor_init(&mc, txn, i, &mx);
|
|
if (txn->mt_dbs[i].md_root == P_INVALID)
|
|
continue;
|
|
count += txn->mt_dbs[i].md_branch_pages +
|
|
txn->mt_dbs[i].md_leaf_pages +
|
|
txn->mt_dbs[i].md_overflow_pages;
|
|
if (txn->mt_dbs[i].md_flags & MDB_DUPSORT) {
|
|
mdb_page_search(&mc, NULL, MDB_PS_FIRST);
|
|
do {
|
|
unsigned j;
|
|
MDB_page *mp;
|
|
mp = mc.mc_pg[mc.mc_top];
|
|
for (j=0; j<NUMKEYS(mp); j++) {
|
|
MDB_node *leaf = NODEPTR(mp, j);
|
|
if (leaf->mn_flags & F_SUBDATA) {
|
|
MDB_db db;
|
|
memcpy(&db, NODEDATA(leaf), sizeof(db));
|
|
count += db.md_branch_pages + db.md_leaf_pages +
|
|
db.md_overflow_pages;
|
|
}
|
|
}
|
|
}
|
|
while (mdb_cursor_sibling(&mc, 1) == 0);
|
|
}
|
|
}
|
|
if (freecount + count + 2 /* metapages */ != txn->mt_next_pgno) {
|
|
fprintf(stderr, "audit: %lu freecount: %lu count: %lu total: %lu next_pgno: %lu\n",
|
|
txn->mt_txnid, freecount, count+2, freecount+count+2, txn->mt_next_pgno);
|
|
}
|
|
}
|
|
#endif
|
|
|
|
int
|
|
mdb_cmp(MDB_txn *txn, MDB_dbi dbi, const MDB_val *a, const MDB_val *b)
|
|
{
|
|
return txn->mt_dbxs[dbi].md_cmp(a, b);
|
|
}
|
|
|
|
int
|
|
mdb_dcmp(MDB_txn *txn, MDB_dbi dbi, const MDB_val *a, const MDB_val *b)
|
|
{
|
|
return txn->mt_dbxs[dbi].md_dcmp(a, b);
|
|
}
|
|
|
|
/** Allocate memory for a page.
|
|
* Re-use old malloc'd pages first for singletons, otherwise just malloc.
|
|
*/
|
|
static MDB_page *
|
|
mdb_page_malloc(MDB_txn *txn, unsigned num)
|
|
{
|
|
MDB_env *env = txn->mt_env;
|
|
MDB_page *ret = env->me_dpages;
|
|
size_t sz = env->me_psize;
|
|
if (num == 1) {
|
|
if (ret) {
|
|
VGMEMP_ALLOC(env, ret, sz);
|
|
VGMEMP_DEFINED(ret, sizeof(ret->mp_next));
|
|
env->me_dpages = ret->mp_next;
|
|
return ret;
|
|
}
|
|
} else {
|
|
sz *= num;
|
|
}
|
|
if ((ret = malloc(sz)) != NULL) {
|
|
VGMEMP_ALLOC(env, ret, sz);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
/** Free a single page.
|
|
* Saves single pages to a list, for future reuse.
|
|
* (This is not used for multi-page overflow pages.)
|
|
*/
|
|
static void
|
|
mdb_page_free(MDB_env *env, MDB_page *mp)
|
|
{
|
|
mp->mp_next = env->me_dpages;
|
|
VGMEMP_FREE(env, mp);
|
|
env->me_dpages = mp;
|
|
}
|
|
|
|
/** Free a dirty page */
|
|
static void
|
|
mdb_dpage_free(MDB_env *env, MDB_page *dp)
|
|
{
|
|
if (!IS_OVERFLOW(dp) || dp->mp_pages == 1) {
|
|
mdb_page_free(env, dp);
|
|
} else {
|
|
/* large pages just get freed directly */
|
|
VGMEMP_FREE(env, dp);
|
|
free(dp);
|
|
}
|
|
}
|
|
|
|
/** Return all dirty pages to dpage list */
|
|
static void
|
|
mdb_dlist_free(MDB_txn *txn)
|
|
{
|
|
MDB_env *env = txn->mt_env;
|
|
MDB_ID2L dl = txn->mt_u.dirty_list;
|
|
unsigned i, n = dl[0].mid;
|
|
|
|
for (i = 1; i <= n; i++) {
|
|
mdb_dpage_free(env, dl[i].mptr);
|
|
}
|
|
dl[0].mid = 0;
|
|
}
|
|
|
|
/** Set or clear P_KEEP in dirty, non-overflow, non-sub pages watched by txn.
|
|
* @param[in] mc A cursor handle for the current operation.
|
|
* @param[in] pflags Flags of the pages to update:
|
|
* P_DIRTY to set P_KEEP, P_DIRTY|P_KEEP to clear it.
|
|
* @param[in] all No shortcuts. Needed except after a full #mdb_page_flush().
|
|
* @return 0 on success, non-zero on failure.
|
|
*/
|
|
static int
|
|
mdb_pages_xkeep(MDB_cursor *mc, unsigned pflags, int all)
|
|
{
|
|
enum { Mask = P_SUBP|P_DIRTY|P_KEEP };
|
|
MDB_txn *txn = mc->mc_txn;
|
|
MDB_cursor *m3;
|
|
MDB_xcursor *mx;
|
|
MDB_page *dp, *mp;
|
|
MDB_node *leaf;
|
|
unsigned i, j;
|
|
int rc = MDB_SUCCESS, level;
|
|
|
|
/* Mark pages seen by cursors */
|
|
if (mc->mc_flags & C_UNTRACK)
|
|
mc = NULL; /* will find mc in mt_cursors */
|
|
for (i = txn->mt_numdbs;; mc = txn->mt_cursors[--i]) {
|
|
for (; mc; mc=mc->mc_next) {
|
|
if (!(mc->mc_flags & C_INITIALIZED))
|
|
continue;
|
|
for (m3 = mc;; m3 = &mx->mx_cursor) {
|
|
mp = NULL;
|
|
for (j=0; j<m3->mc_snum; j++) {
|
|
mp = m3->mc_pg[j];
|
|
if ((mp->mp_flags & Mask) == pflags)
|
|
mp->mp_flags ^= P_KEEP;
|
|
}
|
|
mx = m3->mc_xcursor;
|
|
/* Proceed to mx if it is at a sub-database */
|
|
if (! (mx && (mx->mx_cursor.mc_flags & C_INITIALIZED)))
|
|
break;
|
|
if (! (mp && (mp->mp_flags & P_LEAF)))
|
|
break;
|
|
leaf = NODEPTR(mp, m3->mc_ki[j-1]);
|
|
if (!(leaf->mn_flags & F_SUBDATA))
|
|
break;
|
|
}
|
|
}
|
|
if (i == 0)
|
|
break;
|
|
}
|
|
|
|
if (all) {
|
|
/* Mark dirty root pages */
|
|
for (i=0; i<txn->mt_numdbs; i++) {
|
|
if (txn->mt_dbflags[i] & DB_DIRTY) {
|
|
pgno_t pgno = txn->mt_dbs[i].md_root;
|
|
if (pgno == P_INVALID)
|
|
continue;
|
|
if ((rc = mdb_page_get(txn, pgno, &dp, &level)) != MDB_SUCCESS)
|
|
break;
|
|
if ((dp->mp_flags & Mask) == pflags && level <= 1)
|
|
dp->mp_flags ^= P_KEEP;
|
|
}
|
|
}
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
static int mdb_page_flush(MDB_txn *txn, int keep);
|
|
|
|
/** Spill pages from the dirty list back to disk.
|
|
* This is intended to prevent running into #MDB_TXN_FULL situations,
|
|
* but note that they may still occur in a few cases:
|
|
* 1) our estimate of the txn size could be too small. Currently this
|
|
* seems unlikely, except with a large number of #MDB_MULTIPLE items.
|
|
* 2) child txns may run out of space if their parents dirtied a
|
|
* lot of pages and never spilled them. TODO: we probably should do
|
|
* a preemptive spill during #mdb_txn_begin() of a child txn, if
|
|
* the parent's dirty_room is below a given threshold.
|
|
*
|
|
* Otherwise, if not using nested txns, it is expected that apps will
|
|
* not run into #MDB_TXN_FULL any more. The pages are flushed to disk
|
|
* the same way as for a txn commit, e.g. their P_DIRTY flag is cleared.
|
|
* If the txn never references them again, they can be left alone.
|
|
* If the txn only reads them, they can be used without any fuss.
|
|
* If the txn writes them again, they can be dirtied immediately without
|
|
* going thru all of the work of #mdb_page_touch(). Such references are
|
|
* handled by #mdb_page_unspill().
|
|
*
|
|
* Also note, we never spill DB root pages, nor pages of active cursors,
|
|
* because we'll need these back again soon anyway. And in nested txns,
|
|
* we can't spill a page in a child txn if it was already spilled in a
|
|
* parent txn. That would alter the parent txns' data even though
|
|
* the child hasn't committed yet, and we'd have no way to undo it if
|
|
* the child aborted.
|
|
*
|
|
* @param[in] m0 cursor A cursor handle identifying the transaction and
|
|
* database for which we are checking space.
|
|
* @param[in] key For a put operation, the key being stored.
|
|
* @param[in] data For a put operation, the data being stored.
|
|
* @return 0 on success, non-zero on failure.
|
|
*/
|
|
static int
|
|
mdb_page_spill(MDB_cursor *m0, MDB_val *key, MDB_val *data)
|
|
{
|
|
MDB_txn *txn = m0->mc_txn;
|
|
MDB_page *dp;
|
|
MDB_ID2L dl = txn->mt_u.dirty_list;
|
|
unsigned int i, j, need;
|
|
int rc;
|
|
|
|
if (m0->mc_flags & C_SUB)
|
|
return MDB_SUCCESS;
|
|
|
|
/* Estimate how much space this op will take */
|
|
i = m0->mc_db->md_depth;
|
|
/* Named DBs also dirty the main DB */
|
|
if (m0->mc_dbi > MAIN_DBI)
|
|
i += txn->mt_dbs[MAIN_DBI].md_depth;
|
|
/* For puts, roughly factor in the key+data size */
|
|
if (key)
|
|
i += (LEAFSIZE(key, data) + txn->mt_env->me_psize) / txn->mt_env->me_psize;
|
|
i += i; /* double it for good measure */
|
|
need = i;
|
|
|
|
if (txn->mt_dirty_room > i)
|
|
return MDB_SUCCESS;
|
|
|
|
if (!txn->mt_spill_pgs) {
|
|
txn->mt_spill_pgs = mdb_midl_alloc(MDB_IDL_UM_MAX);
|
|
if (!txn->mt_spill_pgs)
|
|
return ENOMEM;
|
|
} else {
|
|
/* purge deleted slots */
|
|
MDB_IDL sl = txn->mt_spill_pgs;
|
|
unsigned int num = sl[0];
|
|
j=0;
|
|
for (i=1; i<=num; i++) {
|
|
if (!(sl[i] & 1))
|
|
sl[++j] = sl[i];
|
|
}
|
|
sl[0] = j;
|
|
}
|
|
|
|
/* Preserve pages which may soon be dirtied again */
|
|
if ((rc = mdb_pages_xkeep(m0, P_DIRTY, 1)) != MDB_SUCCESS)
|
|
goto done;
|
|
|
|
/* Less aggressive spill - we originally spilled the entire dirty list,
|
|
* with a few exceptions for cursor pages and DB root pages. But this
|
|
* turns out to be a lot of wasted effort because in a large txn many
|
|
* of those pages will need to be used again. So now we spill only 1/8th
|
|
* of the dirty pages. Testing revealed this to be a good tradeoff,
|
|
* better than 1/2, 1/4, or 1/10.
|
|
*/
|
|
if (need < MDB_IDL_UM_MAX / 8)
|
|
need = MDB_IDL_UM_MAX / 8;
|
|
|
|
/* Save the page IDs of all the pages we're flushing */
|
|
/* flush from the tail forward, this saves a lot of shifting later on. */
|
|
for (i=dl[0].mid; i && need; i--) {
|
|
MDB_ID pn = dl[i].mid << 1;
|
|
dp = dl[i].mptr;
|
|
if (dp->mp_flags & P_KEEP)
|
|
continue;
|
|
/* Can't spill twice, make sure it's not already in a parent's
|
|
* spill list.
|
|
*/
|
|
if (txn->mt_parent) {
|
|
MDB_txn *tx2;
|
|
for (tx2 = txn->mt_parent; tx2; tx2 = tx2->mt_parent) {
|
|
if (tx2->mt_spill_pgs) {
|
|
j = mdb_midl_search(tx2->mt_spill_pgs, pn);
|
|
if (j <= tx2->mt_spill_pgs[0] && tx2->mt_spill_pgs[j] == pn) {
|
|
dp->mp_flags |= P_KEEP;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
if (tx2)
|
|
continue;
|
|
}
|
|
if ((rc = mdb_midl_append(&txn->mt_spill_pgs, pn)))
|
|
goto done;
|
|
need--;
|
|
}
|
|
mdb_midl_sort(txn->mt_spill_pgs);
|
|
|
|
/* Flush the spilled part of dirty list */
|
|
if ((rc = mdb_page_flush(txn, i)) != MDB_SUCCESS)
|
|
goto done;
|
|
|
|
/* Reset any dirty pages we kept that page_flush didn't see */
|
|
rc = mdb_pages_xkeep(m0, P_DIRTY|P_KEEP, i);
|
|
|
|
done:
|
|
txn->mt_flags |= rc ? MDB_TXN_ERROR : MDB_TXN_SPILLS;
|
|
return rc;
|
|
}
|
|
|
|
/** Find oldest txnid still referenced. Expects txn->mt_txnid > 0. */
|
|
static txnid_t
|
|
mdb_find_oldest(MDB_txn *txn)
|
|
{
|
|
int i;
|
|
txnid_t mr, oldest = txn->mt_txnid - 1;
|
|
if (txn->mt_env->me_txns) {
|
|
MDB_reader *r = txn->mt_env->me_txns->mti_readers;
|
|
for (i = txn->mt_env->me_txns->mti_numreaders; --i >= 0; ) {
|
|
if (r[i].mr_pid) {
|
|
mr = r[i].mr_txnid;
|
|
if (oldest > mr)
|
|
oldest = mr;
|
|
}
|
|
}
|
|
}
|
|
return oldest;
|
|
}
|
|
|
|
/** Add a page to the txn's dirty list */
|
|
static void
|
|
mdb_page_dirty(MDB_txn *txn, MDB_page *mp)
|
|
{
|
|
MDB_ID2 mid;
|
|
int (*insert)(MDB_ID2L, MDB_ID2 *);
|
|
|
|
if (txn->mt_env->me_flags & MDB_WRITEMAP) {
|
|
insert = mdb_mid2l_append;
|
|
} else {
|
|
insert = mdb_mid2l_insert;
|
|
}
|
|
mid.mid = mp->mp_pgno;
|
|
mid.mptr = mp;
|
|
insert(txn->mt_u.dirty_list, &mid);
|
|
txn->mt_dirty_room--;
|
|
}
|
|
|
|
/** Allocate page numbers and memory for writing. Maintain me_pglast,
|
|
* me_pghead and mt_next_pgno.
|
|
*
|
|
* If there are free pages available from older transactions, they
|
|
* are re-used first. Otherwise allocate a new page at mt_next_pgno.
|
|
* Do not modify the freedB, just merge freeDB records into me_pghead[]
|
|
* and move me_pglast to say which records were consumed. Only this
|
|
* function can create me_pghead and move me_pglast/mt_next_pgno.
|
|
* @param[in] mc cursor A cursor handle identifying the transaction and
|
|
* database for which we are allocating.
|
|
* @param[in] num the number of pages to allocate.
|
|
* @param[out] mp Address of the allocated page(s). Requests for multiple pages
|
|
* will always be satisfied by a single contiguous chunk of memory.
|
|
* @return 0 on success, non-zero on failure.
|
|
*/
|
|
static int
|
|
mdb_page_alloc(MDB_cursor *mc, int num, MDB_page **mp)
|
|
{
|
|
#ifdef MDB_PARANOID /* Seems like we can ignore this now */
|
|
/* Get at most <Max_retries> more freeDB records once me_pghead
|
|
* has enough pages. If not enough, use new pages from the map.
|
|
* If <Paranoid> and mc is updating the freeDB, only get new
|
|
* records if me_pghead is empty. Then the freelist cannot play
|
|
* catch-up with itself by growing while trying to save it.
|
|
*/
|
|
enum { Paranoid = 1, Max_retries = 500 };
|
|
#else
|
|
enum { Paranoid = 0, Max_retries = INT_MAX /*infinite*/ };
|
|
#endif
|
|
int rc, n2 = num-1, retry = Max_retries;
|
|
MDB_txn *txn = mc->mc_txn;
|
|
MDB_env *env = txn->mt_env;
|
|
pgno_t pgno, *mop = env->me_pghead;
|
|
unsigned i, j, k, mop_len = mop ? mop[0] : 0;
|
|
MDB_page *np;
|
|
txnid_t oldest = 0, last;
|
|
MDB_cursor_op op;
|
|
MDB_cursor m2;
|
|
|
|
*mp = NULL;
|
|
|
|
/* If our dirty list is already full, we can't do anything */
|
|
if (txn->mt_dirty_room == 0)
|
|
return MDB_TXN_FULL;
|
|
|
|
for (op = MDB_FIRST;; op = MDB_NEXT) {
|
|
MDB_val key, data;
|
|
MDB_node *leaf;
|
|
pgno_t *idl, old_id, new_id;
|
|
|
|
/* Seek a big enough contiguous page range. Prefer
|
|
* pages at the tail, just truncating the list.
|
|
*/
|
|
if (mop_len >= (unsigned)num) {
|
|
i = mop_len;
|
|
do {
|
|
pgno = mop[i];
|
|
if (mop[i-n2] == pgno+n2)
|
|
goto search_done;
|
|
} while (--i >= (unsigned)num);
|
|
if (Max_retries < INT_MAX && --retry < 0)
|
|
break;
|
|
}
|
|
|
|
if (op == MDB_FIRST) { /* 1st iteration */
|
|
/* Prepare to fetch more and coalesce */
|
|
oldest = mdb_find_oldest(txn);
|
|
last = env->me_pglast;
|
|
mdb_cursor_init(&m2, txn, FREE_DBI, NULL);
|
|
if (last) {
|
|
op = MDB_SET_RANGE;
|
|
key.mv_data = &last; /* will look up last+1 */
|
|
key.mv_size = sizeof(last);
|
|
}
|
|
if (Paranoid && mc->mc_dbi == FREE_DBI)
|
|
retry = -1;
|
|
}
|
|
if (Paranoid && retry < 0 && mop_len)
|
|
break;
|
|
|
|
last++;
|
|
/* Do not fetch more if the record will be too recent */
|
|
if (oldest <= last)
|
|
break;
|
|
rc = mdb_cursor_get(&m2, &key, NULL, op);
|
|
if (rc) {
|
|
if (rc == MDB_NOTFOUND)
|
|
break;
|
|
return rc;
|
|
}
|
|
last = *(txnid_t*)key.mv_data;
|
|
if (oldest <= last)
|
|
break;
|
|
np = m2.mc_pg[m2.mc_top];
|
|
leaf = NODEPTR(np, m2.mc_ki[m2.mc_top]);
|
|
if ((rc = mdb_node_read(txn, leaf, &data)) != MDB_SUCCESS)
|
|
return rc;
|
|
|
|
idl = (MDB_ID *) data.mv_data;
|
|
i = idl[0];
|
|
if (!mop) {
|
|
if (!(env->me_pghead = mop = mdb_midl_alloc(i)))
|
|
return ENOMEM;
|
|
} else {
|
|
if ((rc = mdb_midl_need(&env->me_pghead, i)) != 0)
|
|
return rc;
|
|
mop = env->me_pghead;
|
|
}
|
|
env->me_pglast = last;
|
|
#if (MDB_DEBUG) > 1
|
|
DPRINTF(("IDL read txn %"Z"u root %"Z"u num %u",
|
|
last, txn->mt_dbs[FREE_DBI].md_root, i));
|
|
for (k = i; k; k--)
|
|
DPRINTF(("IDL %"Z"u", idl[k]));
|
|
#endif
|
|
/* Merge in descending sorted order */
|
|
j = mop_len;
|
|
k = mop_len += i;
|
|
mop[0] = (pgno_t)-1;
|
|
old_id = mop[j];
|
|
while (i) {
|
|
new_id = idl[i--];
|
|
for (; old_id < new_id; old_id = mop[--j])
|
|
mop[k--] = old_id;
|
|
mop[k--] = new_id;
|
|
}
|
|
mop[0] = mop_len;
|
|
}
|
|
|
|
/* Use new pages from the map when nothing suitable in the freeDB */
|
|
i = 0;
|
|
pgno = txn->mt_next_pgno;
|
|
if (pgno + num >= env->me_maxpg) {
|
|
DPUTS("DB size maxed out");
|
|
return MDB_MAP_FULL;
|
|
}
|
|
|
|
search_done:
|
|
if (env->me_flags & MDB_WRITEMAP) {
|
|
np = (MDB_page *)(env->me_map + env->me_psize * pgno);
|
|
} else {
|
|
if (!(np = mdb_page_malloc(txn, num)))
|
|
return ENOMEM;
|
|
}
|
|
if (i) {
|
|
mop[0] = mop_len -= num;
|
|
/* Move any stragglers down */
|
|
for (j = i-num; j < mop_len; )
|
|
mop[++j] = mop[++i];
|
|
} else {
|
|
txn->mt_next_pgno = pgno + num;
|
|
}
|
|
np->mp_pgno = pgno;
|
|
mdb_page_dirty(txn, np);
|
|
*mp = np;
|
|
|
|
return MDB_SUCCESS;
|
|
}
|
|
|
|
/** Copy the used portions of a non-overflow page.
|
|
* @param[in] dst page to copy into
|
|
* @param[in] src page to copy from
|
|
* @param[in] psize size of a page
|
|
*/
|
|
static void
|
|
mdb_page_copy(MDB_page *dst, MDB_page *src, unsigned int psize)
|
|
{
|
|
enum { Align = sizeof(pgno_t) };
|
|
indx_t upper = src->mp_upper, lower = src->mp_lower, unused = upper-lower;
|
|
|
|
/* If page isn't full, just copy the used portion. Adjust
|
|
* alignment so memcpy may copy words instead of bytes.
|
|
*/
|
|
if ((unused &= -Align) && !IS_LEAF2(src)) {
|
|
upper &= -Align;
|
|
memcpy(dst, src, (lower + (Align-1)) & -Align);
|
|
memcpy((pgno_t *)((char *)dst+upper), (pgno_t *)((char *)src+upper),
|
|
psize - upper);
|
|
} else {
|
|
memcpy(dst, src, psize - unused);
|
|
}
|
|
}
|
|
|
|
/** Pull a page off the txn's spill list, if present.
|
|
* If a page being referenced was spilled to disk in this txn, bring
|
|
* it back and make it dirty/writable again.
|
|
* @param[in] txn the transaction handle.
|
|
* @param[in] mp the page being referenced.
|
|
* @param[out] ret the writable page, if any. ret is unchanged if
|
|
* mp wasn't spilled.
|
|
*/
|
|
static int
|
|
mdb_page_unspill(MDB_txn *txn, MDB_page *mp, MDB_page **ret)
|
|
{
|
|
MDB_env *env = txn->mt_env;
|
|
const MDB_txn *tx2;
|
|
unsigned x;
|
|
pgno_t pgno = mp->mp_pgno, pn = pgno << 1;
|
|
|
|
for (tx2 = txn; tx2; tx2=tx2->mt_parent) {
|
|
if (!tx2->mt_spill_pgs)
|
|
continue;
|
|
x = mdb_midl_search(tx2->mt_spill_pgs, pn);
|
|
if (x <= tx2->mt_spill_pgs[0] && tx2->mt_spill_pgs[x] == pn) {
|
|
MDB_page *np;
|
|
int num;
|
|
if (txn->mt_dirty_room == 0)
|
|
return MDB_TXN_FULL;
|
|
if (IS_OVERFLOW(mp))
|
|
num = mp->mp_pages;
|
|
else
|
|
num = 1;
|
|
if (env->me_flags & MDB_WRITEMAP) {
|
|
np = mp;
|
|
} else {
|
|
np = mdb_page_malloc(txn, num);
|
|
if (!np)
|
|
return ENOMEM;
|
|
if (num > 1)
|
|
memcpy(np, mp, num * env->me_psize);
|
|
else
|
|
mdb_page_copy(np, mp, env->me_psize);
|
|
}
|
|
if (tx2 == txn) {
|
|
/* If in current txn, this page is no longer spilled.
|
|
* If it happens to be the last page, truncate the spill list.
|
|
* Otherwise mark it as deleted by setting the LSB.
|
|
*/
|
|
if (x == txn->mt_spill_pgs[0])
|
|
txn->mt_spill_pgs[0]--;
|
|
else
|
|
txn->mt_spill_pgs[x] |= 1;
|
|
} /* otherwise, if belonging to a parent txn, the
|
|
* page remains spilled until child commits
|
|
*/
|
|
|
|
mdb_page_dirty(txn, np);
|
|
np->mp_flags |= P_DIRTY;
|
|
*ret = np;
|
|
break;
|
|
}
|
|
}
|
|
return MDB_SUCCESS;
|
|
}
|
|
|
|
/** Touch a page: make it dirty and re-insert into tree with updated pgno.
|
|
* @param[in] mc cursor pointing to the page to be touched
|
|
* @return 0 on success, non-zero on failure.
|
|
*/
|
|
static int
|
|
mdb_page_touch(MDB_cursor *mc)
|
|
{
|
|
MDB_page *mp = mc->mc_pg[mc->mc_top], *np;
|
|
MDB_txn *txn = mc->mc_txn;
|
|
MDB_cursor *m2, *m3;
|
|
pgno_t pgno;
|
|
int rc;
|
|
|
|
if (!F_ISSET(mp->mp_flags, P_DIRTY)) {
|
|
if (txn->mt_flags & MDB_TXN_SPILLS) {
|
|
np = NULL;
|
|
rc = mdb_page_unspill(txn, mp, &np);
|
|
if (rc)
|
|
return rc;
|
|
if (np)
|
|
goto done;
|
|
}
|
|
if ((rc = mdb_midl_need(&txn->mt_free_pgs, 1)) ||
|
|
(rc = mdb_page_alloc(mc, 1, &np)))
|
|
return rc;
|
|
pgno = np->mp_pgno;
|
|
DPRINTF(("touched db %d page %"Z"u -> %"Z"u", DDBI(mc),
|
|
mp->mp_pgno, pgno));
|
|
assert(mp->mp_pgno != pgno);
|
|
mdb_midl_xappend(txn->mt_free_pgs, mp->mp_pgno);
|
|
/* Update the parent page, if any, to point to the new page */
|
|
if (mc->mc_top) {
|
|
MDB_page *parent = mc->mc_pg[mc->mc_top-1];
|
|
MDB_node *node = NODEPTR(parent, mc->mc_ki[mc->mc_top-1]);
|
|
SETPGNO(node, pgno);
|
|
} else {
|
|
mc->mc_db->md_root = pgno;
|
|
}
|
|
} else if (txn->mt_parent && !IS_SUBP(mp)) {
|
|
MDB_ID2 mid, *dl = txn->mt_u.dirty_list;
|
|
pgno = mp->mp_pgno;
|
|
/* If txn has a parent, make sure the page is in our
|
|
* dirty list.
|
|
*/
|
|
if (dl[0].mid) {
|
|
unsigned x = mdb_mid2l_search(dl, pgno);
|
|
if (x <= dl[0].mid && dl[x].mid == pgno) {
|
|
if (mp != dl[x].mptr) { /* bad cursor? */
|
|
mc->mc_flags &= ~(C_INITIALIZED|C_EOF);
|
|
return MDB_CORRUPTED;
|
|
}
|
|
return 0;
|
|
}
|
|
}
|
|
assert(dl[0].mid < MDB_IDL_UM_MAX);
|
|
/* No - copy it */
|
|
np = mdb_page_malloc(txn, 1);
|
|
if (!np)
|
|
return ENOMEM;
|
|
mid.mid = pgno;
|
|
mid.mptr = np;
|
|
mdb_mid2l_insert(dl, &mid);
|
|
} else {
|
|
return 0;
|
|
}
|
|
|
|
mdb_page_copy(np, mp, txn->mt_env->me_psize);
|
|
np->mp_pgno = pgno;
|
|
np->mp_flags |= P_DIRTY;
|
|
|
|
done:
|
|
/* Adjust cursors pointing to mp */
|
|
mc->mc_pg[mc->mc_top] = np;
|
|
m2 = txn->mt_cursors[mc->mc_dbi];
|
|
if (mc->mc_flags & C_SUB) {
|
|
for (; m2; m2=m2->mc_next) {
|
|
m3 = &m2->mc_xcursor->mx_cursor;
|
|
if (m3->mc_snum < mc->mc_snum) continue;
|
|
if (m3->mc_pg[mc->mc_top] == mp)
|
|
m3->mc_pg[mc->mc_top] = np;
|
|
}
|
|
} else {
|
|
for (; m2; m2=m2->mc_next) {
|
|
if (m2->mc_snum < mc->mc_snum) continue;
|
|
if (m2->mc_pg[mc->mc_top] == mp) {
|
|
m2->mc_pg[mc->mc_top] = np;
|
|
if ((mc->mc_db->md_flags & MDB_DUPSORT) &&
|
|
m2->mc_ki[mc->mc_top] == mc->mc_ki[mc->mc_top])
|
|
{
|
|
MDB_node *leaf = NODEPTR(np, mc->mc_ki[mc->mc_top]);
|
|
if (!(leaf->mn_flags & F_SUBDATA))
|
|
m2->mc_xcursor->mx_cursor.mc_pg[0] = NODEDATA(leaf);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
mdb_env_sync(MDB_env *env, int force)
|
|
{
|
|
int rc = 0;
|
|
if (force || !F_ISSET(env->me_flags, MDB_NOSYNC)) {
|
|
if (env->me_flags & MDB_WRITEMAP) {
|
|
int flags = ((env->me_flags & MDB_MAPASYNC) && !force)
|
|
? MS_ASYNC : MS_SYNC;
|
|
if (MDB_MSYNC(env->me_map, env->me_mapsize, flags))
|
|
rc = ErrCode();
|
|
#ifdef _WIN32
|
|
else if (flags == MS_SYNC && MDB_FDATASYNC(env->me_fd))
|
|
rc = ErrCode();
|
|
#endif
|
|
} else {
|
|
if (MDB_FDATASYNC(env->me_fd))
|
|
rc = ErrCode();
|
|
}
|
|
}
|
|
return rc;
|
|
}
|
|
|
|
/** Back up parent txn's cursors, then grab the originals for tracking */
|
|
static int
|
|
mdb_cursor_shadow(MDB_txn *src, MDB_txn *dst)
|
|
{
|
|
MDB_cursor *mc, *bk;
|
|
MDB_xcursor *mx;
|
|
size_t size;
|
|
int i;
|
|
|
|
for (i = src->mt_numdbs; --i >= 0; ) {
|
|
if ((mc = src->mt_cursors[i]) != NULL) {
|
|
size = sizeof(MDB_cursor);
|
|
if (mc->mc_xcursor)
|
|
size += sizeof(MDB_xcursor);
|
|
for (; mc; mc = bk->mc_next) {
|
|
bk = malloc(size);
|
|
if (!bk)
|
|
return ENOMEM;
|
|
*bk = *mc;
|
|
mc->mc_backup = bk;
|
|
mc->mc_db = &dst->mt_dbs[i];
|
|
/* Kill pointers into src - and dst to reduce abuse: The
|
|
* user may not use mc until dst ends. Otherwise we'd...
|
|
*/
|
|
mc->mc_txn = NULL; /* ...set this to dst */
|
|
mc->mc_dbflag = NULL; /* ...and &dst->mt_dbflags[i] */
|
|
if ((mx = mc->mc_xcursor) != NULL) {
|
|
*(MDB_xcursor *)(bk+1) = *mx;
|
|
mx->mx_cursor.mc_txn = NULL; /* ...and dst. */
|
|
}
|
|
mc->mc_next = dst->mt_cursors[i];
|
|
dst->mt_cursors[i] = mc;
|
|
}
|
|
}
|
|
}
|
|
return MDB_SUCCESS;
|
|
}
|
|
|
|
/** Close this write txn's cursors, give parent txn's cursors back to parent.
|
|
* @param[in] txn the transaction handle.
|
|
* @param[in] merge true to keep changes to parent cursors, false to revert.
|
|
* @return 0 on success, non-zero on failure.
|
|
*/
|
|
static void
|
|
mdb_cursors_close(MDB_txn *txn, unsigned merge)
|
|
{
|
|
MDB_cursor **cursors = txn->mt_cursors, *mc, *next, *bk;
|
|
MDB_xcursor *mx;
|
|
int i;
|
|
|
|
for (i = txn->mt_numdbs; --i >= 0; ) {
|
|
for (mc = cursors[i]; mc; mc = next) {
|
|
next = mc->mc_next;
|
|
if ((bk = mc->mc_backup) != NULL) {
|
|
if (merge) {
|
|
/* Commit changes to parent txn */
|
|
mc->mc_next = bk->mc_next;
|
|
mc->mc_backup = bk->mc_backup;
|
|
mc->mc_txn = bk->mc_txn;
|
|
mc->mc_db = bk->mc_db;
|
|
mc->mc_dbflag = bk->mc_dbflag;
|
|
if ((mx = mc->mc_xcursor) != NULL)
|
|
mx->mx_cursor.mc_txn = bk->mc_txn;
|
|
} else {
|
|
/* Abort nested txn */
|
|
*mc = *bk;
|
|
if ((mx = mc->mc_xcursor) != NULL)
|
|
*mx = *(MDB_xcursor *)(bk+1);
|
|
}
|
|
mc = bk;
|
|
}
|
|
/* Only malloced cursors are permanently tracked. */
|
|
free(mc);
|
|
}
|
|
cursors[i] = NULL;
|
|
}
|
|
}
|
|
|
|
#if !(MDB_DEBUG)
|
|
#define mdb_txn_reset0(txn, act) mdb_txn_reset0(txn)
|
|
#endif
|
|
static void
|
|
mdb_txn_reset0(MDB_txn *txn, const char *act);
|
|
|
|
#if !(MDB_PIDLOCK) /* Currently the same as defined(_WIN32) */
|
|
enum Pidlock_op {
|
|
Pidset, Pidcheck
|
|
};
|
|
#else
|
|
enum Pidlock_op {
|
|
Pidset = F_SETLK, Pidcheck = F_GETLK
|
|
};
|
|
#endif
|
|
|
|
/** Set or check a pid lock. Set returns 0 on success.
|
|
* Check returns 0 if the process is certainly dead, nonzero if it may
|
|
* be alive (the lock exists or an error happened so we do not know).
|
|
*
|
|
* On Windows Pidset is a no-op, we merely check for the existence
|
|
* of the process with the given pid. On POSIX we use a single byte
|
|
* lock on the lockfile, set at an offset equal to the pid.
|
|
*/
|
|
static int
|
|
mdb_reader_pid(MDB_env *env, enum Pidlock_op op, pid_t pid)
|
|
{
|
|
#if !(MDB_PIDLOCK) /* Currently the same as defined(_WIN32) */
|
|
int ret = 0;
|
|
HANDLE h;
|
|
if (op == Pidcheck) {
|
|
h = OpenProcess(env->me_pidquery, FALSE, pid);
|
|
/* No documented "no such process" code, but other program use this: */
|
|
if (!h)
|
|
return ErrCode() != ERROR_INVALID_PARAMETER;
|
|
/* A process exists until all handles to it close. Has it exited? */
|
|
ret = WaitForSingleObject(h, 0) != 0;
|
|
CloseHandle(h);
|
|
}
|
|
return ret;
|
|
#else
|
|
for (;;) {
|
|
int rc;
|
|
struct flock lock_info;
|
|
memset(&lock_info, 0, sizeof(lock_info));
|
|
lock_info.l_type = F_WRLCK;
|
|
lock_info.l_whence = SEEK_SET;
|
|
lock_info.l_start = pid;
|
|
lock_info.l_len = 1;
|
|
if ((rc = fcntl(env->me_lfd, op, &lock_info)) == 0) {
|
|
if (op == F_GETLK && lock_info.l_type != F_UNLCK)
|
|
rc = -1;
|
|
} else if ((rc = ErrCode()) == EINTR) {
|
|
continue;
|
|
}
|
|
return rc;
|
|
}
|
|
#endif
|
|
}
|
|
|
|
/** Common code for #mdb_txn_begin() and #mdb_txn_renew().
|
|
* @param[in] txn the transaction handle to initialize
|
|
* @return 0 on success, non-zero on failure.
|
|
*/
|
|
static int
|
|
mdb_txn_renew0(MDB_txn *txn)
|
|
{
|
|
MDB_env *env = txn->mt_env;
|
|
MDB_meta *meta;
|
|
unsigned int i;
|
|
uint16_t x;
|
|
int rc, new_notls = 0;
|
|
|
|
/* Setup db info */
|
|
txn->mt_numdbs = env->me_numdbs;
|
|
txn->mt_dbxs = env->me_dbxs; /* mostly static anyway */
|
|
|
|
if (txn->mt_flags & MDB_TXN_RDONLY) {
|
|
if (!env->me_txns) {
|
|
meta = env->me_metas[ mdb_env_pick_meta(env) ];
|
|
txn->mt_txnid = meta->mm_txnid;
|
|
txn->mt_u.reader = NULL;
|
|
} else {
|
|
MDB_reader *r = (env->me_flags & MDB_NOTLS) ? txn->mt_u.reader :
|
|
pthread_getspecific(env->me_txkey);
|
|
if (r) {
|
|
if (r->mr_pid != env->me_pid || r->mr_txnid != (txnid_t)-1)
|
|
return MDB_BAD_RSLOT;
|
|
} else {
|
|
pid_t pid = env->me_pid;
|
|
pthread_t tid = pthread_self();
|
|
|
|
if (!(env->me_flags & MDB_LIVE_READER)) {
|
|
rc = mdb_reader_pid(env, Pidset, pid);
|
|
if (rc) {
|
|
UNLOCK_MUTEX_R(env);
|
|
return rc;
|
|
}
|
|
env->me_flags |= MDB_LIVE_READER;
|
|
}
|
|
|
|
LOCK_MUTEX_R(env);
|
|
for (i=0; i<env->me_txns->mti_numreaders; i++)
|
|
if (env->me_txns->mti_readers[i].mr_pid == 0)
|
|
break;
|
|
if (i == env->me_maxreaders) {
|
|
UNLOCK_MUTEX_R(env);
|
|
return MDB_READERS_FULL;
|
|
}
|
|
env->me_txns->mti_readers[i].mr_pid = pid;
|
|
env->me_txns->mti_readers[i].mr_tid = tid;
|
|
if (i >= env->me_txns->mti_numreaders)
|
|
env->me_txns->mti_numreaders = i+1;
|
|
/* Save numreaders for un-mutexed mdb_env_close() */
|
|
env->me_numreaders = env->me_txns->mti_numreaders;
|
|
UNLOCK_MUTEX_R(env);
|
|
r = &env->me_txns->mti_readers[i];
|
|
new_notls = (env->me_flags & MDB_NOTLS);
|
|
if (!new_notls && (rc=pthread_setspecific(env->me_txkey, r))) {
|
|
r->mr_pid = 0;
|
|
return rc;
|
|
}
|
|
}
|
|
txn->mt_txnid = r->mr_txnid = env->me_txns->mti_txnid;
|
|
txn->mt_u.reader = r;
|
|
meta = env->me_metas[txn->mt_txnid & 1];
|
|
}
|
|
} else {
|
|
if (env->me_txns) {
|
|
LOCK_MUTEX_W(env);
|
|
|
|
txn->mt_txnid = env->me_txns->mti_txnid;
|
|
meta = env->me_metas[txn->mt_txnid & 1];
|
|
} else {
|
|
meta = env->me_metas[ mdb_env_pick_meta(env) ];
|
|
txn->mt_txnid = meta->mm_txnid;
|
|
}
|
|
txn->mt_txnid++;
|
|
#if MDB_DEBUG
|
|
if (txn->mt_txnid == mdb_debug_start)
|
|
mdb_debug = 1;
|
|
#endif
|
|
txn->mt_dirty_room = MDB_IDL_UM_MAX;
|
|
txn->mt_u.dirty_list = env->me_dirty_list;
|
|
txn->mt_u.dirty_list[0].mid = 0;
|
|
txn->mt_free_pgs = env->me_free_pgs;
|
|
txn->mt_free_pgs[0] = 0;
|
|
txn->mt_spill_pgs = NULL;
|
|
env->me_txn = txn;
|
|
}
|
|
|
|
/* Copy the DB info and flags */
|
|
memcpy(txn->mt_dbs, meta->mm_dbs, 2 * sizeof(MDB_db));
|
|
|
|
/* Moved to here to avoid a data race in read TXNs */
|
|
txn->mt_next_pgno = meta->mm_last_pg+1;
|
|
|
|
for (i=2; i<txn->mt_numdbs; i++) {
|
|
x = env->me_dbflags[i];
|
|
txn->mt_dbs[i].md_flags = x & PERSISTENT_FLAGS;
|
|
txn->mt_dbflags[i] = (x & MDB_VALID) ? DB_VALID|DB_STALE : 0;
|
|
}
|
|
txn->mt_dbflags[0] = txn->mt_dbflags[1] = DB_VALID;
|
|
|
|
if (env->me_maxpg < txn->mt_next_pgno) {
|
|
mdb_txn_reset0(txn, "renew0-mapfail");
|
|
if (new_notls) {
|
|
txn->mt_u.reader->mr_pid = 0;
|
|
txn->mt_u.reader = NULL;
|
|
}
|
|
return MDB_MAP_RESIZED;
|
|
}
|
|
|
|
return MDB_SUCCESS;
|
|
}
|
|
|
|
int
|
|
mdb_txn_renew(MDB_txn *txn)
|
|
{
|
|
int rc;
|
|
|
|
if (!txn || txn->mt_dbxs) /* A reset txn has mt_dbxs==NULL */
|
|
return EINVAL;
|
|
|
|
if (txn->mt_env->me_flags & MDB_FATAL_ERROR) {
|
|
DPUTS("environment had fatal error, must shutdown!");
|
|
return MDB_PANIC;
|
|
}
|
|
|
|
rc = mdb_txn_renew0(txn);
|
|
if (rc == MDB_SUCCESS) {
|
|
DPRINTF(("renew txn %"Z"u%c %p on mdbenv %p, root page %"Z"u",
|
|
txn->mt_txnid, (txn->mt_flags & MDB_TXN_RDONLY) ? 'r' : 'w',
|
|
(void *)txn, (void *)txn->mt_env, txn->mt_dbs[MAIN_DBI].md_root));
|
|
}
|
|
return rc;
|
|
}
|
|
|
|
int
|
|
mdb_txn_begin(MDB_env *env, MDB_txn *parent, unsigned int flags, MDB_txn **ret)
|
|
{
|
|
MDB_txn *txn;
|
|
MDB_ntxn *ntxn;
|
|
int rc, size, tsize = sizeof(MDB_txn);
|
|
|
|
if (env->me_flags & MDB_FATAL_ERROR) {
|
|
DPUTS("environment had fatal error, must shutdown!");
|
|
return MDB_PANIC;
|
|
}
|
|
if ((env->me_flags & MDB_RDONLY) && !(flags & MDB_RDONLY))
|
|
return EACCES;
|
|
if (parent) {
|
|
/* Nested transactions: Max 1 child, write txns only, no writemap */
|
|
if (parent->mt_child ||
|
|
(flags & MDB_RDONLY) ||
|
|
(parent->mt_flags & (MDB_TXN_RDONLY|MDB_TXN_ERROR)) ||
|
|
(env->me_flags & MDB_WRITEMAP))
|
|
{
|
|
return (parent->mt_flags & MDB_TXN_RDONLY) ? EINVAL : MDB_BAD_TXN;
|
|
}
|
|
tsize = sizeof(MDB_ntxn);
|
|
}
|
|
size = tsize + env->me_maxdbs * (sizeof(MDB_db)+1);
|
|
if (!(flags & MDB_RDONLY))
|
|
size += env->me_maxdbs * sizeof(MDB_cursor *);
|
|
|
|
if ((txn = calloc(1, size)) == NULL) {
|
|
DPRINTF(("calloc: %s", strerror(ErrCode())));
|
|
return ENOMEM;
|
|
}
|
|
txn->mt_dbs = (MDB_db *) ((char *)txn + tsize);
|
|
if (flags & MDB_RDONLY) {
|
|
txn->mt_flags |= MDB_TXN_RDONLY;
|
|
txn->mt_dbflags = (unsigned char *)(txn->mt_dbs + env->me_maxdbs);
|
|
} else {
|
|
txn->mt_cursors = (MDB_cursor **)(txn->mt_dbs + env->me_maxdbs);
|
|
txn->mt_dbflags = (unsigned char *)(txn->mt_cursors + env->me_maxdbs);
|
|
}
|
|
txn->mt_env = env;
|
|
|
|
if (parent) {
|
|
unsigned int i;
|
|
txn->mt_u.dirty_list = malloc(sizeof(MDB_ID2)*MDB_IDL_UM_SIZE);
|
|
if (!txn->mt_u.dirty_list ||
|
|
!(txn->mt_free_pgs = mdb_midl_alloc(MDB_IDL_UM_MAX)))
|
|
{
|
|
free(txn->mt_u.dirty_list);
|
|
free(txn);
|
|
return ENOMEM;
|
|
}
|
|
txn->mt_txnid = parent->mt_txnid;
|
|
txn->mt_dirty_room = parent->mt_dirty_room;
|
|
txn->mt_u.dirty_list[0].mid = 0;
|
|
txn->mt_spill_pgs = NULL;
|
|
txn->mt_next_pgno = parent->mt_next_pgno;
|
|
parent->mt_child = txn;
|
|
txn->mt_parent = parent;
|
|
txn->mt_numdbs = parent->mt_numdbs;
|
|
txn->mt_flags = parent->mt_flags;
|
|
txn->mt_dbxs = parent->mt_dbxs;
|
|
memcpy(txn->mt_dbs, parent->mt_dbs, txn->mt_numdbs * sizeof(MDB_db));
|
|
/* Copy parent's mt_dbflags, but clear DB_NEW */
|
|
for (i=0; i<txn->mt_numdbs; i++)
|
|
txn->mt_dbflags[i] = parent->mt_dbflags[i] & ~DB_NEW;
|
|
rc = 0;
|
|
ntxn = (MDB_ntxn *)txn;
|
|
ntxn->mnt_pgstate = env->me_pgstate; /* save parent me_pghead & co */
|
|
if (env->me_pghead) {
|
|
size = MDB_IDL_SIZEOF(env->me_pghead);
|
|
env->me_pghead = mdb_midl_alloc(env->me_pghead[0]);
|
|
if (env->me_pghead)
|
|
memcpy(env->me_pghead, ntxn->mnt_pgstate.mf_pghead, size);
|
|
else
|
|
rc = ENOMEM;
|
|
}
|
|
if (!rc)
|
|
rc = mdb_cursor_shadow(parent, txn);
|
|
if (rc)
|
|
mdb_txn_reset0(txn, "beginchild-fail");
|
|
} else {
|
|
rc = mdb_txn_renew0(txn);
|
|
}
|
|
if (rc)
|
|
free(txn);
|
|
else {
|
|
*ret = txn;
|
|
DPRINTF(("begin txn %"Z"u%c %p on mdbenv %p, root page %"Z"u",
|
|
txn->mt_txnid, (txn->mt_flags & MDB_TXN_RDONLY) ? 'r' : 'w',
|
|
(void *) txn, (void *) env, txn->mt_dbs[MAIN_DBI].md_root));
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
MDB_env *
|
|
mdb_txn_env(MDB_txn *txn)
|
|
{
|
|
if(!txn) return NULL;
|
|
return txn->mt_env;
|
|
}
|
|
|
|
/** Export or close DBI handles opened in this txn. */
|
|
static void
|
|
mdb_dbis_update(MDB_txn *txn, int keep)
|
|
{
|
|
int i;
|
|
MDB_dbi n = txn->mt_numdbs;
|
|
MDB_env *env = txn->mt_env;
|
|
unsigned char *tdbflags = txn->mt_dbflags;
|
|
|
|
for (i = n; --i >= 2;) {
|
|
if (tdbflags[i] & DB_NEW) {
|
|
if (keep) {
|
|
env->me_dbflags[i] = txn->mt_dbs[i].md_flags | MDB_VALID;
|
|
} else {
|
|
char *ptr = env->me_dbxs[i].md_name.mv_data;
|
|
env->me_dbxs[i].md_name.mv_data = NULL;
|
|
env->me_dbxs[i].md_name.mv_size = 0;
|
|
env->me_dbflags[i] = 0;
|
|
free(ptr);
|
|
}
|
|
}
|
|
}
|
|
if (keep && env->me_numdbs < n)
|
|
env->me_numdbs = n;
|
|
}
|
|
|
|
/** Common code for #mdb_txn_reset() and #mdb_txn_abort().
|
|
* May be called twice for readonly txns: First reset it, then abort.
|
|
* @param[in] txn the transaction handle to reset
|
|
* @param[in] act why the transaction is being reset
|
|
*/
|
|
static void
|
|
mdb_txn_reset0(MDB_txn *txn, const char *act)
|
|
{
|
|
MDB_env *env = txn->mt_env;
|
|
|
|
/* Close any DBI handles opened in this txn */
|
|
mdb_dbis_update(txn, 0);
|
|
|
|
DPRINTF(("%s txn %"Z"u%c %p on mdbenv %p, root page %"Z"u",
|
|
act, txn->mt_txnid, (txn->mt_flags & MDB_TXN_RDONLY) ? 'r' : 'w',
|
|
(void *) txn, (void *)env, txn->mt_dbs[MAIN_DBI].md_root));
|
|
|
|
if (F_ISSET(txn->mt_flags, MDB_TXN_RDONLY)) {
|
|
if (txn->mt_u.reader) {
|
|
txn->mt_u.reader->mr_txnid = (txnid_t)-1;
|
|
if (!(env->me_flags & MDB_NOTLS))
|
|
txn->mt_u.reader = NULL; /* txn does not own reader */
|
|
}
|
|
txn->mt_numdbs = 0; /* close nothing if called again */
|
|
txn->mt_dbxs = NULL; /* mark txn as reset */
|
|
} else {
|
|
mdb_cursors_close(txn, 0);
|
|
|
|
if (!(env->me_flags & MDB_WRITEMAP)) {
|
|
mdb_dlist_free(txn);
|
|
}
|
|
mdb_midl_free(env->me_pghead);
|
|
|
|
if (txn->mt_parent) {
|
|
txn->mt_parent->mt_child = NULL;
|
|
env->me_pgstate = ((MDB_ntxn *)txn)->mnt_pgstate;
|
|
mdb_midl_free(txn->mt_free_pgs);
|
|
mdb_midl_free(txn->mt_spill_pgs);
|
|
free(txn->mt_u.dirty_list);
|
|
return;
|
|
}
|
|
|
|
if (mdb_midl_shrink(&txn->mt_free_pgs))
|
|
env->me_free_pgs = txn->mt_free_pgs;
|
|
env->me_pghead = NULL;
|
|
env->me_pglast = 0;
|
|
|
|
env->me_txn = NULL;
|
|
/* The writer mutex was locked in mdb_txn_begin. */
|
|
if (env->me_txns)
|
|
UNLOCK_MUTEX_W(env);
|
|
}
|
|
}
|
|
|
|
void
|
|
mdb_txn_reset(MDB_txn *txn)
|
|
{
|
|
if (txn == NULL)
|
|
return;
|
|
|
|
/* This call is only valid for read-only txns */
|
|
if (!(txn->mt_flags & MDB_TXN_RDONLY))
|
|
return;
|
|
|
|
mdb_txn_reset0(txn, "reset");
|
|
}
|
|
|
|
void
|
|
mdb_txn_abort(MDB_txn *txn)
|
|
{
|
|
if (txn == NULL)
|
|
return;
|
|
|
|
if (txn->mt_child)
|
|
mdb_txn_abort(txn->mt_child);
|
|
|
|
mdb_txn_reset0(txn, "abort");
|
|
/* Free reader slot tied to this txn (if MDB_NOTLS && writable FS) */
|
|
if ((txn->mt_flags & MDB_TXN_RDONLY) && txn->mt_u.reader)
|
|
txn->mt_u.reader->mr_pid = 0;
|
|
|
|
free(txn);
|
|
}
|
|
|
|
/** Save the freelist as of this transaction to the freeDB.
|
|
* This changes the freelist. Keep trying until it stabilizes.
|
|
*/
|
|
static int
|
|
mdb_freelist_save(MDB_txn *txn)
|
|
{
|
|
/* env->me_pghead[] can grow and shrink during this call.
|
|
* env->me_pglast and txn->mt_free_pgs[] can only grow.
|
|
* Page numbers cannot disappear from txn->mt_free_pgs[].
|
|
*/
|
|
MDB_cursor mc;
|
|
MDB_env *env = txn->mt_env;
|
|
int rc, maxfree_1pg = env->me_maxfree_1pg, more = 1;
|
|
txnid_t pglast = 0, head_id = 0;
|
|
pgno_t freecnt = 0, *free_pgs, *mop;
|
|
ssize_t head_room = 0, total_room = 0, mop_len;
|
|
|
|
mdb_cursor_init(&mc, txn, FREE_DBI, NULL);
|
|
|
|
if (env->me_pghead) {
|
|
/* Make sure first page of freeDB is touched and on freelist */
|
|
rc = mdb_page_search(&mc, NULL, MDB_PS_FIRST|MDB_PS_MODIFY);
|
|
if (rc && rc != MDB_NOTFOUND)
|
|
return rc;
|
|
}
|
|
|
|
for (;;) {
|
|
/* Come back here after each Put() in case freelist changed */
|
|
MDB_val key, data;
|
|
|
|
/* If using records from freeDB which we have not yet
|
|
* deleted, delete them and any we reserved for me_pghead.
|
|
*/
|
|
while (pglast < env->me_pglast) {
|
|
rc = mdb_cursor_first(&mc, &key, NULL);
|
|
if (rc)
|
|
return rc;
|
|
pglast = head_id = *(txnid_t *)key.mv_data;
|
|
total_room = head_room = 0;
|
|
assert(pglast <= env->me_pglast);
|
|
rc = mdb_cursor_del(&mc, 0);
|
|
if (rc)
|
|
return rc;
|
|
}
|
|
|
|
/* Save the IDL of pages freed by this txn, to a single record */
|
|
if (freecnt < txn->mt_free_pgs[0]) {
|
|
if (!freecnt) {
|
|
/* Make sure last page of freeDB is touched and on freelist */
|
|
rc = mdb_page_search(&mc, NULL, MDB_PS_LAST|MDB_PS_MODIFY);
|
|
if (rc && rc != MDB_NOTFOUND)
|
|
return rc;
|
|
}
|
|
free_pgs = txn->mt_free_pgs;
|
|
/* Write to last page of freeDB */
|
|
key.mv_size = sizeof(txn->mt_txnid);
|
|
key.mv_data = &txn->mt_txnid;
|
|
do {
|
|
freecnt = free_pgs[0];
|
|
data.mv_size = MDB_IDL_SIZEOF(free_pgs);
|
|
rc = mdb_cursor_put(&mc, &key, &data, MDB_RESERVE);
|
|
if (rc)
|
|
return rc;
|
|
/* Retry if mt_free_pgs[] grew during the Put() */
|
|
free_pgs = txn->mt_free_pgs;
|
|
} while (freecnt < free_pgs[0]);
|
|
mdb_midl_sort(free_pgs);
|
|
memcpy(data.mv_data, free_pgs, data.mv_size);
|
|
#if (MDB_DEBUG) > 1
|
|
{
|
|
unsigned int i = free_pgs[0];
|
|
DPRINTF(("IDL write txn %"Z"u root %"Z"u num %u",
|
|
txn->mt_txnid, txn->mt_dbs[FREE_DBI].md_root, i));
|
|
for (; i; i--)
|
|
DPRINTF(("IDL %"Z"u", free_pgs[i]));
|
|
}
|
|
#endif
|
|
continue;
|
|
}
|
|
|
|
mop = env->me_pghead;
|
|
mop_len = mop ? mop[0] : 0;
|
|
|
|
/* Reserve records for me_pghead[]. Split it if multi-page,
|
|
* to avoid searching freeDB for a page range. Use keys in
|
|
* range [1,me_pglast]: Smaller than txnid of oldest reader.
|
|
*/
|
|
if (total_room >= mop_len) {
|
|
if (total_room == mop_len || --more < 0)
|
|
break;
|
|
} else if (head_room >= maxfree_1pg && head_id > 1) {
|
|
/* Keep current record (overflow page), add a new one */
|
|
head_id--;
|
|
head_room = 0;
|
|
}
|
|
/* (Re)write {key = head_id, IDL length = head_room} */
|
|
total_room -= head_room;
|
|
head_room = mop_len - total_room;
|
|
if (head_room > maxfree_1pg && head_id > 1) {
|
|
/* Overflow multi-page for part of me_pghead */
|
|
head_room /= head_id; /* amortize page sizes */
|
|
head_room += maxfree_1pg - head_room % (maxfree_1pg + 1);
|
|
} else if (head_room < 0) {
|
|
/* Rare case, not bothering to delete this record */
|
|
head_room = 0;
|
|
}
|
|
key.mv_size = sizeof(head_id);
|
|
key.mv_data = &head_id;
|
|
data.mv_size = (head_room + 1) * sizeof(pgno_t);
|
|
rc = mdb_cursor_put(&mc, &key, &data, MDB_RESERVE);
|
|
if (rc)
|
|
return rc;
|
|
*(MDB_ID *)data.mv_data = 0; /* IDL is initially empty */
|
|
total_room += head_room;
|
|
}
|
|
|
|
/* Fill in the reserved me_pghead records */
|
|
rc = MDB_SUCCESS;
|
|
if (mop_len) {
|
|
MDB_val key, data;
|
|
|
|
mop += mop_len;
|
|
rc = mdb_cursor_first(&mc, &key, &data);
|
|
for (; !rc; rc = mdb_cursor_next(&mc, &key, &data, MDB_NEXT)) {
|
|
unsigned flags = MDB_CURRENT;
|
|
txnid_t id = *(txnid_t *)key.mv_data;
|
|
ssize_t len = (ssize_t)(data.mv_size / sizeof(MDB_ID)) - 1;
|
|
MDB_ID save;
|
|
|
|
assert(len >= 0 && id <= env->me_pglast);
|
|
key.mv_data = &id;
|
|
if (len > mop_len) {
|
|
len = mop_len;
|
|
data.mv_size = (len + 1) * sizeof(MDB_ID);
|
|
flags = 0;
|
|
}
|
|
data.mv_data = mop -= len;
|
|
save = mop[0];
|
|
mop[0] = len;
|
|
rc = mdb_cursor_put(&mc, &key, &data, flags);
|
|
mop[0] = save;
|
|
if (rc || !(mop_len -= len))
|
|
break;
|
|
}
|
|
}
|
|
return rc;
|
|
}
|
|
|
|
/** Flush (some) dirty pages to the map, after clearing their dirty flag.
|
|
* @param[in] txn the transaction that's being committed
|
|
* @param[in] keep number of initial pages in dirty_list to keep dirty.
|
|
* @return 0 on success, non-zero on failure.
|
|
*/
|
|
static int
|
|
mdb_page_flush(MDB_txn *txn, int keep)
|
|
{
|
|
MDB_env *env = txn->mt_env;
|
|
MDB_ID2L dl = txn->mt_u.dirty_list;
|
|
unsigned psize = env->me_psize, j;
|
|
int i, pagecount = dl[0].mid, rc;
|
|
size_t size = 0, pos = 0;
|
|
pgno_t pgno = 0;
|
|
MDB_page *dp = NULL;
|
|
#ifdef _WIN32
|
|
OVERLAPPED ov;
|
|
#else
|
|
struct iovec iov[MDB_COMMIT_PAGES];
|
|
ssize_t wpos = 0, wsize = 0, wres;
|
|
size_t next_pos = 1; /* impossible pos, so pos != next_pos */
|
|
int n = 0;
|
|
#endif
|
|
|
|
j = i = keep;
|
|
|
|
if (env->me_flags & MDB_WRITEMAP) {
|
|
/* Clear dirty flags */
|
|
while (++i <= pagecount) {
|
|
dp = dl[i].mptr;
|
|
/* Don't flush this page yet */
|
|
if (dp->mp_flags & P_KEEP) {
|
|
dp->mp_flags ^= P_KEEP;
|
|
dl[++j] = dl[i];
|
|
continue;
|
|
}
|
|
dp->mp_flags &= ~P_DIRTY;
|
|
}
|
|
goto done;
|
|
}
|
|
|
|
/* Write the pages */
|
|
for (;;) {
|
|
if (++i <= pagecount) {
|
|
dp = dl[i].mptr;
|
|
/* Don't flush this page yet */
|
|
if (dp->mp_flags & P_KEEP) {
|
|
dp->mp_flags ^= P_KEEP;
|
|
dl[i].mid = 0;
|
|
continue;
|
|
}
|
|
pgno = dl[i].mid;
|
|
/* clear dirty flag */
|
|
dp->mp_flags &= ~P_DIRTY;
|
|
pos = pgno * psize;
|
|
size = psize;
|
|
if (IS_OVERFLOW(dp)) size *= dp->mp_pages;
|
|
}
|
|
#ifdef _WIN32
|
|
else break;
|
|
|
|
/* Windows actually supports scatter/gather I/O, but only on
|
|
* unbuffered file handles. Since we're relying on the OS page
|
|
* cache for all our data, that's self-defeating. So we just
|
|
* write pages one at a time. We use the ov structure to set
|
|
* the write offset, to at least save the overhead of a Seek
|
|
* system call.
|
|
*/
|
|
DPRINTF(("committing page %"Z"u", pgno));
|
|
memset(&ov, 0, sizeof(ov));
|
|
ov.Offset = pos & 0xffffffff;
|
|
ov.OffsetHigh = pos >> 16 >> 16;
|
|
if (!WriteFile(env->me_fd, dp, size, NULL, &ov)) {
|
|
rc = ErrCode();
|
|
DPRINTF(("WriteFile: %d", rc));
|
|
return rc;
|
|
}
|
|
#else
|
|
/* Write up to MDB_COMMIT_PAGES dirty pages at a time. */
|
|
if (pos!=next_pos || n==MDB_COMMIT_PAGES || wsize+size>MAX_WRITE) {
|
|
if (n) {
|
|
/* Write previous page(s) */
|
|
#ifdef MDB_USE_PWRITEV
|
|
wres = pwritev(env->me_fd, iov, n, wpos);
|
|
#else
|
|
if (n == 1) {
|
|
wres = pwrite(env->me_fd, iov[0].iov_base, wsize, wpos);
|
|
} else {
|
|
if (lseek(env->me_fd, wpos, SEEK_SET) == -1) {
|
|
rc = ErrCode();
|
|
DPRINTF(("lseek: %s", strerror(rc)));
|
|
return rc;
|
|
}
|
|
wres = writev(env->me_fd, iov, n);
|
|
}
|
|
#endif
|
|
if (wres != wsize) {
|
|
if (wres < 0) {
|
|
rc = ErrCode();
|
|
DPRINTF(("Write error: %s", strerror(rc)));
|
|
} else {
|
|
rc = EIO; /* TODO: Use which error code? */
|
|
DPUTS("short write, filesystem full?");
|
|
}
|
|
return rc;
|
|
}
|
|
n = 0;
|
|
}
|
|
if (i > pagecount)
|
|
break;
|
|
wpos = pos;
|
|
wsize = 0;
|
|
}
|
|
DPRINTF(("committing page %"Z"u", pgno));
|
|
next_pos = pos + size;
|
|
iov[n].iov_len = size;
|
|
iov[n].iov_base = (char *)dp;
|
|
wsize += size;
|
|
n++;
|
|
#endif /* _WIN32 */
|
|
}
|
|
|
|
for (i = keep; ++i <= pagecount; ) {
|
|
dp = dl[i].mptr;
|
|
/* This is a page we skipped above */
|
|
if (!dl[i].mid) {
|
|
dl[++j] = dl[i];
|
|
dl[j].mid = dp->mp_pgno;
|
|
continue;
|
|
}
|
|
mdb_dpage_free(env, dp);
|
|
}
|
|
|
|
done:
|
|
i--;
|
|
txn->mt_dirty_room += i - j;
|
|
dl[0].mid = j;
|
|
return MDB_SUCCESS;
|
|
}
|
|
|
|
int
|
|
mdb_txn_commit(MDB_txn *txn)
|
|
{
|
|
int rc;
|
|
unsigned int i;
|
|
MDB_env *env;
|
|
|
|
assert(txn != NULL);
|
|
assert(txn->mt_env != NULL);
|
|
|
|
if (txn->mt_child) {
|
|
rc = mdb_txn_commit(txn->mt_child);
|
|
txn->mt_child = NULL;
|
|
if (rc)
|
|
goto fail;
|
|
}
|
|
|
|
env = txn->mt_env;
|
|
|
|
if (F_ISSET(txn->mt_flags, MDB_TXN_RDONLY)) {
|
|
mdb_dbis_update(txn, 1);
|
|
txn->mt_numdbs = 2; /* so txn_abort() doesn't close any new handles */
|
|
mdb_txn_abort(txn);
|
|
return MDB_SUCCESS;
|
|
}
|
|
|
|
if (F_ISSET(txn->mt_flags, MDB_TXN_ERROR)) {
|
|
DPUTS("error flag is set, can't commit");
|
|
if (txn->mt_parent)
|
|
txn->mt_parent->mt_flags |= MDB_TXN_ERROR;
|
|
rc = MDB_BAD_TXN;
|
|
goto fail;
|
|
}
|
|
|
|
if (txn->mt_parent) {
|
|
MDB_txn *parent = txn->mt_parent;
|
|
MDB_ID2L dst, src;
|
|
MDB_IDL pspill;
|
|
unsigned x, y, len, ps_len;
|
|
|
|
/* Append our free list to parent's */
|
|
rc = mdb_midl_append_list(&parent->mt_free_pgs, txn->mt_free_pgs);
|
|
if (rc)
|
|
goto fail;
|
|
mdb_midl_free(txn->mt_free_pgs);
|
|
/* Failures after this must either undo the changes
|
|
* to the parent or set MDB_TXN_ERROR in the parent.
|
|
*/
|
|
|
|
parent->mt_next_pgno = txn->mt_next_pgno;
|
|
parent->mt_flags = txn->mt_flags;
|
|
|
|
/* Merge our cursors into parent's and close them */
|
|
mdb_cursors_close(txn, 1);
|
|
|
|
/* Update parent's DB table. */
|
|
memcpy(parent->mt_dbs, txn->mt_dbs, txn->mt_numdbs * sizeof(MDB_db));
|
|
parent->mt_numdbs = txn->mt_numdbs;
|
|
parent->mt_dbflags[0] = txn->mt_dbflags[0];
|
|
parent->mt_dbflags[1] = txn->mt_dbflags[1];
|
|
for (i=2; i<txn->mt_numdbs; i++) {
|
|
/* preserve parent's DB_NEW status */
|
|
x = parent->mt_dbflags[i] & DB_NEW;
|
|
parent->mt_dbflags[i] = txn->mt_dbflags[i] | x;
|
|
}
|
|
|
|
dst = parent->mt_u.dirty_list;
|
|
src = txn->mt_u.dirty_list;
|
|
/* Remove anything in our dirty list from parent's spill list */
|
|
if ((pspill = parent->mt_spill_pgs) && (ps_len = pspill[0])) {
|
|
x = y = ps_len;
|
|
pspill[0] = (pgno_t)-1;
|
|
/* Mark our dirty pages as deleted in parent spill list */
|
|
for (i=0, len=src[0].mid; ++i <= len; ) {
|
|
MDB_ID pn = src[i].mid << 1;
|
|
while (pn > pspill[x])
|
|
x--;
|
|
if (pn == pspill[x]) {
|
|
pspill[x] = 1;
|
|
y = --x;
|
|
}
|
|
}
|
|
/* Squash deleted pagenums if we deleted any */
|
|
for (x=y; ++x <= ps_len; )
|
|
if (!(pspill[x] & 1))
|
|
pspill[++y] = pspill[x];
|
|
pspill[0] = y;
|
|
}
|
|
|
|
/* Find len = length of merging our dirty list with parent's */
|
|
x = dst[0].mid;
|
|
dst[0].mid = 0; /* simplify loops */
|
|
if (parent->mt_parent) {
|
|
len = x + src[0].mid;
|
|
y = mdb_mid2l_search(src, dst[x].mid + 1) - 1;
|
|
for (i = x; y && i; y--) {
|
|
pgno_t yp = src[y].mid;
|
|
while (yp < dst[i].mid)
|
|
i--;
|
|
if (yp == dst[i].mid) {
|
|
i--;
|
|
len--;
|
|
}
|
|
}
|
|
} else { /* Simplify the above for single-ancestor case */
|
|
len = MDB_IDL_UM_MAX - txn->mt_dirty_room;
|
|
}
|
|
/* Merge our dirty list with parent's */
|
|
y = src[0].mid;
|
|
for (i = len; y; dst[i--] = src[y--]) {
|
|
pgno_t yp = src[y].mid;
|
|
while (yp < dst[x].mid)
|
|
dst[i--] = dst[x--];
|
|
if (yp == dst[x].mid)
|
|
free(dst[x--].mptr);
|
|
}
|
|
assert(i == x);
|
|
dst[0].mid = len;
|
|
free(txn->mt_u.dirty_list);
|
|
parent->mt_dirty_room = txn->mt_dirty_room;
|
|
if (txn->mt_spill_pgs) {
|
|
if (parent->mt_spill_pgs) {
|
|
/* TODO: Prevent failure here, so parent does not fail */
|
|
rc = mdb_midl_append_list(&parent->mt_spill_pgs, txn->mt_spill_pgs);
|
|
if (rc)
|
|
parent->mt_flags |= MDB_TXN_ERROR;
|
|
mdb_midl_free(txn->mt_spill_pgs);
|
|
mdb_midl_sort(parent->mt_spill_pgs);
|
|
} else {
|
|
parent->mt_spill_pgs = txn->mt_spill_pgs;
|
|
}
|
|
}
|
|
|
|
parent->mt_child = NULL;
|
|
mdb_midl_free(((MDB_ntxn *)txn)->mnt_pgstate.mf_pghead);
|
|
free(txn);
|
|
return rc;
|
|
}
|
|
|
|
if (txn != env->me_txn) {
|
|
DPUTS("attempt to commit unknown transaction");
|
|
rc = EINVAL;
|
|
goto fail;
|
|
}
|
|
|
|
mdb_cursors_close(txn, 0);
|
|
|
|
if (!txn->mt_u.dirty_list[0].mid &&
|
|
!(txn->mt_flags & (MDB_TXN_DIRTY|MDB_TXN_SPILLS)))
|
|
goto done;
|
|
|
|
DPRINTF(("committing txn %"Z"u %p on mdbenv %p, root page %"Z"u",
|
|
txn->mt_txnid, (void*)txn, (void*)env, txn->mt_dbs[MAIN_DBI].md_root));
|
|
|
|
/* Update DB root pointers */
|
|
if (txn->mt_numdbs > 2) {
|
|
MDB_cursor mc;
|
|
MDB_dbi i;
|
|
MDB_val data;
|
|
data.mv_size = sizeof(MDB_db);
|
|
|
|
mdb_cursor_init(&mc, txn, MAIN_DBI, NULL);
|
|
for (i = 2; i < txn->mt_numdbs; i++) {
|
|
if (txn->mt_dbflags[i] & DB_DIRTY) {
|
|
data.mv_data = &txn->mt_dbs[i];
|
|
rc = mdb_cursor_put(&mc, &txn->mt_dbxs[i].md_name, &data, 0);
|
|
if (rc)
|
|
goto fail;
|
|
}
|
|
}
|
|
}
|
|
|
|
rc = mdb_freelist_save(txn);
|
|
if (rc)
|
|
goto fail;
|
|
|
|
mdb_midl_free(env->me_pghead);
|
|
env->me_pghead = NULL;
|
|
if (mdb_midl_shrink(&txn->mt_free_pgs))
|
|
env->me_free_pgs = txn->mt_free_pgs;
|
|
|
|
#if (MDB_DEBUG) > 2
|
|
mdb_audit(txn);
|
|
#endif
|
|
|
|
if ((rc = mdb_page_flush(txn, 0)) ||
|
|
(rc = mdb_env_sync(env, 0)) ||
|
|
(rc = mdb_env_write_meta(txn)))
|
|
goto fail;
|
|
|
|
done:
|
|
env->me_pglast = 0;
|
|
env->me_txn = NULL;
|
|
mdb_dbis_update(txn, 1);
|
|
|
|
if (env->me_txns)
|
|
UNLOCK_MUTEX_W(env);
|
|
free(txn);
|
|
|
|
return MDB_SUCCESS;
|
|
|
|
fail:
|
|
mdb_txn_abort(txn);
|
|
return rc;
|
|
}
|
|
|
|
/** Read the environment parameters of a DB environment before
|
|
* mapping it into memory.
|
|
* @param[in] env the environment handle
|
|
* @param[out] meta address of where to store the meta information
|
|
* @return 0 on success, non-zero on failure.
|
|
*/
|
|
static int
|
|
mdb_env_read_header(MDB_env *env, MDB_meta *meta)
|
|
{
|
|
MDB_pagebuf pbuf;
|
|
MDB_page *p;
|
|
MDB_meta *m;
|
|
int i, rc, off;
|
|
|
|
/* We don't know the page size yet, so use a minimum value.
|
|
* Read both meta pages so we can use the latest one.
|
|
*/
|
|
|
|
for (i=off=0; i<2; i++, off = meta->mm_psize) {
|
|
#ifdef _WIN32
|
|
DWORD len;
|
|
OVERLAPPED ov;
|
|
memset(&ov, 0, sizeof(ov));
|
|
ov.Offset = off;
|
|
rc = ReadFile(env->me_fd,&pbuf,MDB_PAGESIZE,&len,&ov) ? (int)len : -1;
|
|
if (rc == -1 && ErrCode() == ERROR_HANDLE_EOF)
|
|
rc = 0;
|
|
#else
|
|
rc = pread(env->me_fd, &pbuf, MDB_PAGESIZE, off);
|
|
#endif
|
|
if (rc != MDB_PAGESIZE) {
|
|
if (rc == 0 && off == 0)
|
|
return ENOENT;
|
|
rc = rc < 0 ? (int) ErrCode() : MDB_INVALID;
|
|
DPRINTF(("read: %s", mdb_strerror(rc)));
|
|
return rc;
|
|
}
|
|
|
|
p = (MDB_page *)&pbuf;
|
|
|
|
if (!F_ISSET(p->mp_flags, P_META)) {
|
|
DPRINTF(("page %"Z"u not a meta page", p->mp_pgno));
|
|
return MDB_INVALID;
|
|
}
|
|
|
|
m = METADATA(p);
|
|
if (m->mm_magic != MDB_MAGIC) {
|
|
DPUTS("meta has invalid magic");
|
|
return MDB_INVALID;
|
|
}
|
|
|
|
if (m->mm_version != MDB_DATA_VERSION) {
|
|
DPRINTF(("database is version %u, expected version %u",
|
|
m->mm_version, MDB_DATA_VERSION));
|
|
return MDB_VERSION_MISMATCH;
|
|
}
|
|
|
|
if (off == 0 || m->mm_txnid > meta->mm_txnid)
|
|
*meta = *m;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/** Write the environment parameters of a freshly created DB environment.
|
|
* @param[in] env the environment handle
|
|
* @param[out] meta address of where to store the meta information
|
|
* @return 0 on success, non-zero on failure.
|
|
*/
|
|
static int
|
|
mdb_env_init_meta(MDB_env *env, MDB_meta *meta)
|
|
{
|
|
MDB_page *p, *q;
|
|
int rc;
|
|
unsigned int psize;
|
|
#ifdef _WIN32
|
|
DWORD len;
|
|
OVERLAPPED ov;
|
|
memset(&ov, 0, sizeof(ov));
|
|
#define DO_PWRITE(rc, fd, ptr, size, len, pos) do { \
|
|
ov.Offset = pos; \
|
|
rc = WriteFile(fd, ptr, size, &len, &ov); } while(0)
|
|
#else
|
|
int len;
|
|
#define DO_PWRITE(rc, fd, ptr, size, len, pos) do { \
|
|
len = pwrite(fd, ptr, size, pos); \
|
|
rc = (len >= 0); } while(0)
|
|
#endif
|
|
|
|
DPUTS("writing new meta page");
|
|
|
|
psize = env->me_psize;
|
|
|
|
meta->mm_magic = MDB_MAGIC;
|
|
meta->mm_version = MDB_DATA_VERSION;
|
|
meta->mm_mapsize = env->me_mapsize;
|
|
meta->mm_psize = psize;
|
|
meta->mm_last_pg = 1;
|
|
meta->mm_flags = env->me_flags & 0xffff;
|
|
meta->mm_flags |= MDB_INTEGERKEY;
|
|
meta->mm_dbs[0].md_root = P_INVALID;
|
|
meta->mm_dbs[1].md_root = P_INVALID;
|
|
|
|
p = calloc(2, psize);
|
|
p->mp_pgno = 0;
|
|
p->mp_flags = P_META;
|
|
*(MDB_meta *)METADATA(p) = *meta;
|
|
|
|
q = (MDB_page *)((char *)p + psize);
|
|
q->mp_pgno = 1;
|
|
q->mp_flags = P_META;
|
|
*(MDB_meta *)METADATA(q) = *meta;
|
|
|
|
DO_PWRITE(rc, env->me_fd, p, psize * 2, len, 0);
|
|
if (!rc)
|
|
rc = ErrCode();
|
|
else if ((unsigned) len == psize * 2)
|
|
rc = MDB_SUCCESS;
|
|
else
|
|
rc = ENOSPC;
|
|
free(p);
|
|
return rc;
|
|
}
|
|
|
|
/** Update the environment info to commit a transaction.
|
|
* @param[in] txn the transaction that's being committed
|
|
* @return 0 on success, non-zero on failure.
|
|
*/
|
|
static int
|
|
mdb_env_write_meta(MDB_txn *txn)
|
|
{
|
|
MDB_env *env;
|
|
MDB_meta meta, metab, *mp;
|
|
off_t off;
|
|
int rc, len, toggle;
|
|
char *ptr;
|
|
HANDLE mfd;
|
|
#ifdef _WIN32
|
|
OVERLAPPED ov;
|
|
#else
|
|
int r2;
|
|
#endif
|
|
|
|
assert(txn != NULL);
|
|
assert(txn->mt_env != NULL);
|
|
|
|
toggle = txn->mt_txnid & 1;
|
|
DPRINTF(("writing meta page %d for root page %"Z"u",
|
|
toggle, txn->mt_dbs[MAIN_DBI].md_root));
|
|
|
|
env = txn->mt_env;
|
|
mp = env->me_metas[toggle];
|
|
|
|
if (env->me_flags & MDB_WRITEMAP) {
|
|
/* Persist any increases of mapsize config */
|
|
if (env->me_mapsize > mp->mm_mapsize)
|
|
mp->mm_mapsize = env->me_mapsize;
|
|
mp->mm_dbs[0] = txn->mt_dbs[0];
|
|
mp->mm_dbs[1] = txn->mt_dbs[1];
|
|
mp->mm_last_pg = txn->mt_next_pgno - 1;
|
|
mp->mm_txnid = txn->mt_txnid;
|
|
if (!(env->me_flags & (MDB_NOMETASYNC|MDB_NOSYNC))) {
|
|
rc = (env->me_flags & MDB_MAPASYNC) ? MS_ASYNC : MS_SYNC;
|
|
ptr = env->me_map;
|
|
if (toggle)
|
|
ptr += env->me_psize;
|
|
if (MDB_MSYNC(ptr, env->me_psize, rc)) {
|
|
rc = ErrCode();
|
|
goto fail;
|
|
}
|
|
}
|
|
goto done;
|
|
}
|
|
metab.mm_txnid = env->me_metas[toggle]->mm_txnid;
|
|
metab.mm_last_pg = env->me_metas[toggle]->mm_last_pg;
|
|
|
|
ptr = (char *)&meta;
|
|
if (env->me_mapsize > mp->mm_mapsize) {
|
|
/* Persist any increases of mapsize config */
|
|
meta.mm_mapsize = env->me_mapsize;
|
|
off = offsetof(MDB_meta, mm_mapsize);
|
|
} else {
|
|
off = offsetof(MDB_meta, mm_dbs[0].md_depth);
|
|
}
|
|
len = sizeof(MDB_meta) - off;
|
|
|
|
ptr += off;
|
|
meta.mm_dbs[0] = txn->mt_dbs[0];
|
|
meta.mm_dbs[1] = txn->mt_dbs[1];
|
|
meta.mm_last_pg = txn->mt_next_pgno - 1;
|
|
meta.mm_txnid = txn->mt_txnid;
|
|
|
|
if (toggle)
|
|
off += env->me_psize;
|
|
off += PAGEHDRSZ;
|
|
|
|
/* Write to the SYNC fd */
|
|
mfd = env->me_flags & (MDB_NOSYNC|MDB_NOMETASYNC) ?
|
|
env->me_fd : env->me_mfd;
|
|
#ifdef _WIN32
|
|
{
|
|
memset(&ov, 0, sizeof(ov));
|
|
ov.Offset = off;
|
|
if (!WriteFile(mfd, ptr, len, (DWORD *)&rc, &ov))
|
|
rc = -1;
|
|
}
|
|
#else
|
|
rc = pwrite(mfd, ptr, len, off);
|
|
#endif
|
|
if (rc != len) {
|
|
rc = rc < 0 ? ErrCode() : EIO;
|
|
DPUTS("write failed, disk error?");
|
|
/* On a failure, the pagecache still contains the new data.
|
|
* Write some old data back, to prevent it from being used.
|
|
* Use the non-SYNC fd; we know it will fail anyway.
|
|
*/
|
|
meta.mm_last_pg = metab.mm_last_pg;
|
|
meta.mm_txnid = metab.mm_txnid;
|
|
#ifdef _WIN32
|
|
memset(&ov, 0, sizeof(ov));
|
|
ov.Offset = off;
|
|
WriteFile(env->me_fd, ptr, len, NULL, &ov);
|
|
#else
|
|
r2 = pwrite(env->me_fd, ptr, len, off);
|
|
(void)r2; /* Silence warnings. We don't care about pwrite's return value */
|
|
#endif
|
|
fail:
|
|
env->me_flags |= MDB_FATAL_ERROR;
|
|
return rc;
|
|
}
|
|
done:
|
|
/* Memory ordering issues are irrelevant; since the entire writer
|
|
* is wrapped by wmutex, all of these changes will become visible
|
|
* after the wmutex is unlocked. Since the DB is multi-version,
|
|
* readers will get consistent data regardless of how fresh or
|
|
* how stale their view of these values is.
|
|
*/
|
|
if (env->me_txns)
|
|
env->me_txns->mti_txnid = txn->mt_txnid;
|
|
|
|
return MDB_SUCCESS;
|
|
}
|
|
|
|
/** Check both meta pages to see which one is newer.
|
|
* @param[in] env the environment handle
|
|
* @return meta toggle (0 or 1).
|
|
*/
|
|
static int
|
|
mdb_env_pick_meta(const MDB_env *env)
|
|
{
|
|
return (env->me_metas[0]->mm_txnid < env->me_metas[1]->mm_txnid);
|
|
}
|
|
|
|
int
|
|
mdb_env_create(MDB_env **env)
|
|
{
|
|
MDB_env *e;
|
|
|
|
e = calloc(1, sizeof(MDB_env));
|
|
if (!e)
|
|
return ENOMEM;
|
|
|
|
e->me_maxreaders = DEFAULT_READERS;
|
|
e->me_maxdbs = e->me_numdbs = 2;
|
|
e->me_fd = INVALID_HANDLE_VALUE;
|
|
e->me_lfd = INVALID_HANDLE_VALUE;
|
|
e->me_mfd = INVALID_HANDLE_VALUE;
|
|
#ifdef MDB_USE_POSIX_SEM
|
|
e->me_rmutex = SEM_FAILED;
|
|
e->me_wmutex = SEM_FAILED;
|
|
#endif
|
|
e->me_pid = getpid();
|
|
VGMEMP_CREATE(e,0,0);
|
|
*env = e;
|
|
return MDB_SUCCESS;
|
|
}
|
|
|
|
static int
|
|
mdb_env_map(MDB_env *env, void *addr, int newsize)
|
|
{
|
|
MDB_page *p;
|
|
unsigned int flags = env->me_flags;
|
|
#ifdef _WIN32
|
|
int rc;
|
|
HANDLE mh;
|
|
LONG sizelo, sizehi;
|
|
sizelo = env->me_mapsize & 0xffffffff;
|
|
sizehi = env->me_mapsize >> 16 >> 16; /* only needed on Win64 */
|
|
|
|
/* Windows won't create mappings for zero length files.
|
|
* Just allocate the maxsize right now.
|
|
*/
|
|
if (newsize) {
|
|
if (SetFilePointer(env->me_fd, sizelo, &sizehi, 0) != (DWORD)sizelo
|
|
|| !SetEndOfFile(env->me_fd)
|
|
|| SetFilePointer(env->me_fd, 0, NULL, 0) != 0)
|
|
return ErrCode();
|
|
}
|
|
mh = CreateFileMapping(env->me_fd, NULL, flags & MDB_WRITEMAP ?
|
|
PAGE_READWRITE : PAGE_READONLY,
|
|
sizehi, sizelo, NULL);
|
|
if (!mh)
|
|
return ErrCode();
|
|
env->me_map = MapViewOfFileEx(mh, flags & MDB_WRITEMAP ?
|
|
FILE_MAP_WRITE : FILE_MAP_READ,
|
|
0, 0, env->me_mapsize, addr);
|
|
rc = env->me_map ? 0 : ErrCode();
|
|
CloseHandle(mh);
|
|
if (rc)
|
|
return rc;
|
|
#else
|
|
int prot = PROT_READ;
|
|
if (flags & MDB_WRITEMAP) {
|
|
prot |= PROT_WRITE;
|
|
if (newsize && ftruncate(env->me_fd, env->me_mapsize) < 0)
|
|
return ErrCode();
|
|
}
|
|
env->me_map = mmap(addr, env->me_mapsize, prot, MAP_SHARED,
|
|
env->me_fd, 0);
|
|
if (env->me_map == MAP_FAILED) {
|
|
env->me_map = NULL;
|
|
return ErrCode();
|
|
}
|
|
/* Turn off readahead. It's harmful when the DB is larger than RAM. */
|
|
#ifdef MADV_RANDOM
|
|
madvise(env->me_map, env->me_mapsize, MADV_RANDOM);
|
|
#else
|
|
#ifdef POSIX_MADV_RANDOM
|
|
posix_madvise(env->me_map, env->me_mapsize, POSIX_MADV_RANDOM);
|
|
#endif /* POSIX_MADV_RANDOM */
|
|
#endif /* MADV_RANDOM */
|
|
#endif /* _WIN32 */
|
|
|
|
/* Can happen because the address argument to mmap() is just a
|
|
* hint. mmap() can pick another, e.g. if the range is in use.
|
|
* The MAP_FIXED flag would prevent that, but then mmap could
|
|
* instead unmap existing pages to make room for the new map.
|
|
*/
|
|
if (addr && env->me_map != addr)
|
|
return EBUSY; /* TODO: Make a new MDB_* error code? */
|
|
|
|
p = (MDB_page *)env->me_map;
|
|
env->me_metas[0] = METADATA(p);
|
|
env->me_metas[1] = (MDB_meta *)((char *)env->me_metas[0] + env->me_psize);
|
|
|
|
return MDB_SUCCESS;
|
|
}
|
|
|
|
int
|
|
mdb_env_set_mapsize(MDB_env *env, size_t size)
|
|
{
|
|
/* If env is already open, caller is responsible for making
|
|
* sure there are no active txns.
|
|
*/
|
|
if (env->me_map) {
|
|
int rc;
|
|
void *old;
|
|
if (env->me_txn)
|
|
return EINVAL;
|
|
if (!size)
|
|
size = env->me_metas[mdb_env_pick_meta(env)]->mm_mapsize;
|
|
munmap(env->me_map, env->me_mapsize);
|
|
env->me_mapsize = size;
|
|
old = (env->me_flags & MDB_FIXEDMAP) ? env->me_map : NULL;
|
|
rc = mdb_env_map(env, old, 1);
|
|
if (rc)
|
|
return rc;
|
|
}
|
|
env->me_mapsize = size;
|
|
if (env->me_psize)
|
|
env->me_maxpg = env->me_mapsize / env->me_psize;
|
|
return MDB_SUCCESS;
|
|
}
|
|
|
|
int
|
|
mdb_env_set_maxdbs(MDB_env *env, MDB_dbi dbs)
|
|
{
|
|
if (env->me_map)
|
|
return EINVAL;
|
|
env->me_maxdbs = dbs + 2; /* Named databases + main and free DB */
|
|
return MDB_SUCCESS;
|
|
}
|
|
|
|
int
|
|
mdb_env_set_maxreaders(MDB_env *env, unsigned int readers)
|
|
{
|
|
if (env->me_map || readers < 1)
|
|
return EINVAL;
|
|
env->me_maxreaders = readers;
|
|
return MDB_SUCCESS;
|
|
}
|
|
|
|
int
|
|
mdb_env_get_maxreaders(MDB_env *env, unsigned int *readers)
|
|
{
|
|
if (!env || !readers)
|
|
return EINVAL;
|
|
*readers = env->me_maxreaders;
|
|
return MDB_SUCCESS;
|
|
}
|
|
|
|
/** Further setup required for opening an MDB environment
|
|
*/
|
|
static int
|
|
mdb_env_open2(MDB_env *env)
|
|
{
|
|
unsigned int flags = env->me_flags;
|
|
int i, newenv = 0, rc;
|
|
MDB_meta meta;
|
|
|
|
#ifdef _WIN32
|
|
/* See if we should use QueryLimited */
|
|
rc = GetVersion();
|
|
if ((rc & 0xff) > 5)
|
|
env->me_pidquery = MDB_PROCESS_QUERY_LIMITED_INFORMATION;
|
|
else
|
|
env->me_pidquery = PROCESS_QUERY_INFORMATION;
|
|
#endif /* _WIN32 */
|
|
|
|
memset(&meta, 0, sizeof(meta));
|
|
|
|
if ((i = mdb_env_read_header(env, &meta)) != 0) {
|
|
if (i != ENOENT)
|
|
return i;
|
|
DPUTS("new mdbenv");
|
|
newenv = 1;
|
|
GET_PAGESIZE(env->me_psize);
|
|
} else {
|
|
env->me_psize = meta.mm_psize;
|
|
}
|
|
|
|
/* Was a mapsize configured? */
|
|
if (!env->me_mapsize) {
|
|
/* If this is a new environment, take the default,
|
|
* else use the size recorded in the existing env.
|
|
*/
|
|
env->me_mapsize = newenv ? DEFAULT_MAPSIZE : meta.mm_mapsize;
|
|
} else if (env->me_mapsize < meta.mm_mapsize) {
|
|
/* If the configured size is smaller, make sure it's
|
|
* still big enough. Silently round up to minimum if not.
|
|
*/
|
|
size_t minsize = (meta.mm_last_pg + 1) * meta.mm_psize;
|
|
if (env->me_mapsize < minsize)
|
|
env->me_mapsize = minsize;
|
|
}
|
|
|
|
rc = mdb_env_map(env, meta.mm_address, newenv);
|
|
if (rc)
|
|
return rc;
|
|
|
|
if (newenv) {
|
|
if (flags & MDB_FIXEDMAP)
|
|
meta.mm_address = env->me_map;
|
|
i = mdb_env_init_meta(env, &meta);
|
|
if (i != MDB_SUCCESS) {
|
|
return i;
|
|
}
|
|
}
|
|
env->me_maxfree_1pg = (env->me_psize - PAGEHDRSZ) / sizeof(pgno_t) - 1;
|
|
env->me_nodemax = (env->me_psize - PAGEHDRSZ) / MDB_MINKEYS;
|
|
|
|
env->me_maxpg = env->me_mapsize / env->me_psize;
|
|
#if MDB_DEBUG
|
|
{
|
|
int toggle = mdb_env_pick_meta(env);
|
|
MDB_db *db = &env->me_metas[toggle]->mm_dbs[MAIN_DBI];
|
|
|
|
DPRINTF(("opened database version %u, pagesize %u",
|
|
env->me_metas[0]->mm_version, env->me_psize));
|
|
DPRINTF(("using meta page %d", toggle));
|
|
DPRINTF(("depth: %u", db->md_depth));
|
|
DPRINTF(("entries: %"Z"u", db->md_entries));
|
|
DPRINTF(("branch pages: %"Z"u", db->md_branch_pages));
|
|
DPRINTF(("leaf pages: %"Z"u", db->md_leaf_pages));
|
|
DPRINTF(("overflow pages: %"Z"u", db->md_overflow_pages));
|
|
DPRINTF(("root: %"Z"u", db->md_root));
|
|
}
|
|
#endif
|
|
|
|
return MDB_SUCCESS;
|
|
}
|
|
|
|
|
|
/** Release a reader thread's slot in the reader lock table.
|
|
* This function is called automatically when a thread exits.
|
|
* @param[in] ptr This points to the slot in the reader lock table.
|
|
*/
|
|
static void
|
|
mdb_env_reader_dest(void *ptr)
|
|
{
|
|
MDB_reader *reader = ptr;
|
|
|
|
reader->mr_pid = 0;
|
|
}
|
|
|
|
#ifdef _WIN32
|
|
/** Junk for arranging thread-specific callbacks on Windows. This is
|
|
* necessarily platform and compiler-specific. Windows supports up
|
|
* to 1088 keys. Let's assume nobody opens more than 64 environments
|
|
* in a single process, for now. They can override this if needed.
|
|
*/
|
|
#ifndef MAX_TLS_KEYS
|
|
#define MAX_TLS_KEYS 64
|
|
#endif
|
|
static pthread_key_t mdb_tls_keys[MAX_TLS_KEYS];
|
|
static int mdb_tls_nkeys;
|
|
|
|
static void NTAPI mdb_tls_callback(PVOID module, DWORD reason, PVOID ptr)
|
|
{
|
|
int i;
|
|
switch(reason) {
|
|
case DLL_PROCESS_ATTACH: break;
|
|
case DLL_THREAD_ATTACH: break;
|
|
case DLL_THREAD_DETACH:
|
|
for (i=0; i<mdb_tls_nkeys; i++) {
|
|
MDB_reader *r = pthread_getspecific(mdb_tls_keys[i]);
|
|
mdb_env_reader_dest(r);
|
|
}
|
|
break;
|
|
case DLL_PROCESS_DETACH: break;
|
|
}
|
|
}
|
|
#ifdef __GNUC__
|
|
#ifdef _WIN64
|
|
const PIMAGE_TLS_CALLBACK mdb_tls_cbp __attribute__((section (".CRT$XLB"))) = mdb_tls_callback;
|
|
#else
|
|
PIMAGE_TLS_CALLBACK mdb_tls_cbp __attribute__((section (".CRT$XLB"))) = mdb_tls_callback;
|
|
#endif
|
|
#else
|
|
#ifdef _WIN64
|
|
/* Force some symbol references.
|
|
* _tls_used forces the linker to create the TLS directory if not already done
|
|
* mdb_tls_cbp prevents whole-program-optimizer from dropping the symbol.
|
|
*/
|
|
#pragma comment(linker, "/INCLUDE:_tls_used")
|
|
#pragma comment(linker, "/INCLUDE:mdb_tls_cbp")
|
|
#pragma const_seg(".CRT$XLB")
|
|
extern const PIMAGE_TLS_CALLBACK mdb_tls_callback;
|
|
const PIMAGE_TLS_CALLBACK mdb_tls_cbp = mdb_tls_callback;
|
|
#pragma const_seg()
|
|
#else /* WIN32 */
|
|
#pragma comment(linker, "/INCLUDE:__tls_used")
|
|
#pragma comment(linker, "/INCLUDE:_mdb_tls_cbp")
|
|
#pragma data_seg(".CRT$XLB")
|
|
PIMAGE_TLS_CALLBACK mdb_tls_cbp = mdb_tls_callback;
|
|
#pragma data_seg()
|
|
#endif /* WIN 32/64 */
|
|
#endif /* !__GNUC__ */
|
|
#endif
|
|
|
|
/** Downgrade the exclusive lock on the region back to shared */
|
|
static int
|
|
mdb_env_share_locks(MDB_env *env, int *excl)
|
|
{
|
|
int rc = 0, toggle = mdb_env_pick_meta(env);
|
|
|
|
env->me_txns->mti_txnid = env->me_metas[toggle]->mm_txnid;
|
|
|
|
#ifdef _WIN32
|
|
{
|
|
OVERLAPPED ov;
|
|
/* First acquire a shared lock. The Unlock will
|
|
* then release the existing exclusive lock.
|
|
*/
|
|
memset(&ov, 0, sizeof(ov));
|
|
if (!LockFileEx(env->me_lfd, 0, 0, 1, 0, &ov)) {
|
|
rc = ErrCode();
|
|
} else {
|
|
UnlockFile(env->me_lfd, 0, 0, 1, 0);
|
|
*excl = 0;
|
|
}
|
|
}
|
|
#else
|
|
{
|
|
struct flock lock_info;
|
|
/* The shared lock replaces the existing lock */
|
|
memset((void *)&lock_info, 0, sizeof(lock_info));
|
|
lock_info.l_type = F_RDLCK;
|
|
lock_info.l_whence = SEEK_SET;
|
|
lock_info.l_start = 0;
|
|
lock_info.l_len = 1;
|
|
while ((rc = fcntl(env->me_lfd, F_SETLK, &lock_info)) &&
|
|
(rc = ErrCode()) == EINTR) ;
|
|
*excl = rc ? -1 : 0; /* error may mean we lost the lock */
|
|
}
|
|
#endif
|
|
|
|
return rc;
|
|
}
|
|
|
|
/** Try to get exlusive lock, otherwise shared.
|
|
* Maintain *excl = -1: no/unknown lock, 0: shared, 1: exclusive.
|
|
*/
|
|
static int
|
|
mdb_env_excl_lock(MDB_env *env, int *excl)
|
|
{
|
|
int rc = 0;
|
|
#ifdef _WIN32
|
|
if (LockFile(env->me_lfd, 0, 0, 1, 0)) {
|
|
*excl = 1;
|
|
} else {
|
|
OVERLAPPED ov;
|
|
memset(&ov, 0, sizeof(ov));
|
|
if (LockFileEx(env->me_lfd, 0, 0, 1, 0, &ov)) {
|
|
*excl = 0;
|
|
} else {
|
|
rc = ErrCode();
|
|
}
|
|
}
|
|
#else
|
|
struct flock lock_info;
|
|
memset((void *)&lock_info, 0, sizeof(lock_info));
|
|
lock_info.l_type = F_WRLCK;
|
|
lock_info.l_whence = SEEK_SET;
|
|
lock_info.l_start = 0;
|
|
lock_info.l_len = 1;
|
|
while ((rc = fcntl(env->me_lfd, F_SETLK, &lock_info)) &&
|
|
(rc = ErrCode()) == EINTR) ;
|
|
if (!rc) {
|
|
*excl = 1;
|
|
} else
|
|
# ifdef MDB_USE_POSIX_SEM
|
|
if (*excl < 0) /* always true when !MDB_USE_POSIX_SEM */
|
|
# endif
|
|
{
|
|
lock_info.l_type = F_RDLCK;
|
|
while ((rc = fcntl(env->me_lfd, F_SETLKW, &lock_info)) &&
|
|
(rc = ErrCode()) == EINTR) ;
|
|
if (rc == 0)
|
|
*excl = 0;
|
|
}
|
|
#endif
|
|
return rc;
|
|
}
|
|
|
|
#if defined(_WIN32) || defined(MDB_USE_POSIX_SEM)
|
|
/*
|
|
* hash_64 - 64 bit Fowler/Noll/Vo-0 FNV-1a hash code
|
|
*
|
|
* @(#) $Revision: 5.1 $
|
|
* @(#) $Id: hash_64a.c,v 5.1 2009/06/30 09:01:38 chongo Exp $
|
|
* @(#) $Source: /usr/local/src/cmd/fnv/RCS/hash_64a.c,v $
|
|
*
|
|
* http://www.isthe.com/chongo/tech/comp/fnv/index.html
|
|
*
|
|
***
|
|
*
|
|
* Please do not copyright this code. This code is in the public domain.
|
|
*
|
|
* LANDON CURT NOLL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
|
|
* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO
|
|
* EVENT SHALL LANDON CURT NOLL BE LIABLE FOR ANY SPECIAL, INDIRECT OR
|
|
* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF
|
|
* USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
|
|
* OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
|
|
* PERFORMANCE OF THIS SOFTWARE.
|
|
*
|
|
* By:
|
|
* chongo <Landon Curt Noll> /\oo/\
|
|
* http://www.isthe.com/chongo/
|
|
*
|
|
* Share and Enjoy! :-)
|
|
*/
|
|
|
|
typedef unsigned long long mdb_hash_t;
|
|
#define MDB_HASH_INIT ((mdb_hash_t)0xcbf29ce484222325ULL)
|
|
|
|
/** perform a 64 bit Fowler/Noll/Vo FNV-1a hash on a buffer
|
|
* @param[in] val value to hash
|
|
* @param[in] hval initial value for hash
|
|
* @return 64 bit hash
|
|
*
|
|
* NOTE: To use the recommended 64 bit FNV-1a hash, use MDB_HASH_INIT as the
|
|
* hval arg on the first call.
|
|
*/
|
|
static mdb_hash_t
|
|
mdb_hash_val(MDB_val *val, mdb_hash_t hval)
|
|
{
|
|
unsigned char *s = (unsigned char *)val->mv_data; /* unsigned string */
|
|
unsigned char *end = s + val->mv_size;
|
|
/*
|
|
* FNV-1a hash each octet of the string
|
|
*/
|
|
while (s < end) {
|
|
/* xor the bottom with the current octet */
|
|
hval ^= (mdb_hash_t)*s++;
|
|
|
|
/* multiply by the 64 bit FNV magic prime mod 2^64 */
|
|
hval += (hval << 1) + (hval << 4) + (hval << 5) +
|
|
(hval << 7) + (hval << 8) + (hval << 40);
|
|
}
|
|
/* return our new hash value */
|
|
return hval;
|
|
}
|
|
|
|
/** Hash the string and output the encoded hash.
|
|
* This uses modified RFC1924 Ascii85 encoding to accommodate systems with
|
|
* very short name limits. We don't care about the encoding being reversible,
|
|
* we just want to preserve as many bits of the input as possible in a
|
|
* small printable string.
|
|
* @param[in] str string to hash
|
|
* @param[out] encbuf an array of 11 chars to hold the hash
|
|
*/
|
|
static const char mdb_a85[]= "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz!#$%&()*+-;<=>?@^_`{|}~";
|
|
|
|
static void
|
|
mdb_pack85(unsigned long l, char *out)
|
|
{
|
|
int i;
|
|
|
|
for (i=0; i<5; i++) {
|
|
*out++ = mdb_a85[l % 85];
|
|
l /= 85;
|
|
}
|
|
}
|
|
|
|
static void
|
|
mdb_hash_enc(MDB_val *val, char *encbuf)
|
|
{
|
|
mdb_hash_t h = mdb_hash_val(val, MDB_HASH_INIT);
|
|
|
|
mdb_pack85(h, encbuf);
|
|
mdb_pack85(h>>32, encbuf+5);
|
|
encbuf[10] = '\0';
|
|
}
|
|
#endif
|
|
|
|
/** Open and/or initialize the lock region for the environment.
|
|
* @param[in] env The MDB environment.
|
|
* @param[in] lpath The pathname of the file used for the lock region.
|
|
* @param[in] mode The Unix permissions for the file, if we create it.
|
|
* @param[out] excl Resulting file lock type: -1 none, 0 shared, 1 exclusive
|
|
* @param[in,out] excl In -1, out lock type: -1 none, 0 shared, 1 exclusive
|
|
* @return 0 on success, non-zero on failure.
|
|
*/
|
|
static int
|
|
mdb_env_setup_locks(MDB_env *env, char *lpath, int mode, int *excl)
|
|
{
|
|
#ifdef _WIN32
|
|
# define MDB_ERRCODE_ROFS ERROR_WRITE_PROTECT
|
|
#else
|
|
# define MDB_ERRCODE_ROFS EROFS
|
|
#ifdef O_CLOEXEC /* Linux: Open file and set FD_CLOEXEC atomically */
|
|
# define MDB_CLOEXEC O_CLOEXEC
|
|
#else
|
|
int fdflags;
|
|
# define MDB_CLOEXEC 0
|
|
#endif
|
|
#endif
|
|
int rc;
|
|
off_t size, rsize;
|
|
|
|
#ifdef _WIN32
|
|
env->me_lfd = CreateFile(lpath, GENERIC_READ|GENERIC_WRITE,
|
|
FILE_SHARE_READ|FILE_SHARE_WRITE, NULL, OPEN_ALWAYS,
|
|
FILE_ATTRIBUTE_NORMAL, NULL);
|
|
#else
|
|
env->me_lfd = open(lpath, O_RDWR|O_CREAT|MDB_CLOEXEC, mode);
|
|
#endif
|
|
if (env->me_lfd == INVALID_HANDLE_VALUE) {
|
|
rc = ErrCode();
|
|
if (rc == MDB_ERRCODE_ROFS && (env->me_flags & MDB_RDONLY)) {
|
|
return MDB_SUCCESS;
|
|
}
|
|
goto fail_errno;
|
|
}
|
|
#if ! ((MDB_CLOEXEC) || defined(_WIN32))
|
|
/* Lose record locks when exec*() */
|
|
if ((fdflags = fcntl(env->me_lfd, F_GETFD) | FD_CLOEXEC) >= 0)
|
|
fcntl(env->me_lfd, F_SETFD, fdflags);
|
|
#endif
|
|
|
|
if (!(env->me_flags & MDB_NOTLS)) {
|
|
rc = pthread_key_create(&env->me_txkey, mdb_env_reader_dest);
|
|
if (rc)
|
|
goto fail;
|
|
env->me_flags |= MDB_ENV_TXKEY;
|
|
#ifdef _WIN32
|
|
/* Windows TLS callbacks need help finding their TLS info. */
|
|
if (mdb_tls_nkeys >= MAX_TLS_KEYS) {
|
|
rc = MDB_TLS_FULL;
|
|
goto fail;
|
|
}
|
|
mdb_tls_keys[mdb_tls_nkeys++] = env->me_txkey;
|
|
#endif
|
|
}
|
|
|
|
/* Try to get exclusive lock. If we succeed, then
|
|
* nobody is using the lock region and we should initialize it.
|
|
*/
|
|
if ((rc = mdb_env_excl_lock(env, excl))) goto fail;
|
|
|
|
#ifdef _WIN32
|
|
size = GetFileSize(env->me_lfd, NULL);
|
|
#else
|
|
size = lseek(env->me_lfd, 0, SEEK_END);
|
|
if (size == -1) goto fail_errno;
|
|
#endif
|
|
rsize = (env->me_maxreaders-1) * sizeof(MDB_reader) + sizeof(MDB_txninfo);
|
|
if (size < rsize && *excl > 0) {
|
|
#ifdef _WIN32
|
|
if (SetFilePointer(env->me_lfd, rsize, NULL, FILE_BEGIN) != rsize
|
|
|| !SetEndOfFile(env->me_lfd))
|
|
goto fail_errno;
|
|
#else
|
|
if (ftruncate(env->me_lfd, rsize) != 0) goto fail_errno;
|
|
#endif
|
|
} else {
|
|
rsize = size;
|
|
size = rsize - sizeof(MDB_txninfo);
|
|
env->me_maxreaders = size/sizeof(MDB_reader) + 1;
|
|
}
|
|
{
|
|
#ifdef _WIN32
|
|
HANDLE mh;
|
|
mh = CreateFileMapping(env->me_lfd, NULL, PAGE_READWRITE,
|
|
0, 0, NULL);
|
|
if (!mh) goto fail_errno;
|
|
env->me_txns = MapViewOfFileEx(mh, FILE_MAP_WRITE, 0, 0, rsize, NULL);
|
|
CloseHandle(mh);
|
|
if (!env->me_txns) goto fail_errno;
|
|
#else
|
|
void *m = mmap(NULL, rsize, PROT_READ|PROT_WRITE, MAP_SHARED,
|
|
env->me_lfd, 0);
|
|
if (m == MAP_FAILED) goto fail_errno;
|
|
env->me_txns = m;
|
|
#endif
|
|
}
|
|
if (*excl > 0) {
|
|
#ifdef _WIN32
|
|
BY_HANDLE_FILE_INFORMATION stbuf;
|
|
struct {
|
|
DWORD volume;
|
|
DWORD nhigh;
|
|
DWORD nlow;
|
|
} idbuf;
|
|
MDB_val val;
|
|
char encbuf[11];
|
|
|
|
if (!mdb_sec_inited) {
|
|
InitializeSecurityDescriptor(&mdb_null_sd,
|
|
SECURITY_DESCRIPTOR_REVISION);
|
|
SetSecurityDescriptorDacl(&mdb_null_sd, TRUE, 0, FALSE);
|
|
mdb_all_sa.nLength = sizeof(SECURITY_ATTRIBUTES);
|
|
mdb_all_sa.bInheritHandle = FALSE;
|
|
mdb_all_sa.lpSecurityDescriptor = &mdb_null_sd;
|
|
mdb_sec_inited = 1;
|
|
}
|
|
if (!GetFileInformationByHandle(env->me_lfd, &stbuf)) goto fail_errno;
|
|
idbuf.volume = stbuf.dwVolumeSerialNumber;
|
|
idbuf.nhigh = stbuf.nFileIndexHigh;
|
|
idbuf.nlow = stbuf.nFileIndexLow;
|
|
val.mv_data = &idbuf;
|
|
val.mv_size = sizeof(idbuf);
|
|
mdb_hash_enc(&val, encbuf);
|
|
sprintf(env->me_txns->mti_rmname, "Global\\MDBr%s", encbuf);
|
|
sprintf(env->me_txns->mti_wmname, "Global\\MDBw%s", encbuf);
|
|
env->me_rmutex = CreateMutex(&mdb_all_sa, FALSE, env->me_txns->mti_rmname);
|
|
if (!env->me_rmutex) goto fail_errno;
|
|
env->me_wmutex = CreateMutex(&mdb_all_sa, FALSE, env->me_txns->mti_wmname);
|
|
if (!env->me_wmutex) goto fail_errno;
|
|
#elif defined(MDB_USE_POSIX_SEM)
|
|
struct stat stbuf;
|
|
struct {
|
|
dev_t dev;
|
|
ino_t ino;
|
|
} idbuf;
|
|
MDB_val val;
|
|
char encbuf[11];
|
|
|
|
#if defined(__NetBSD__)
|
|
#define MDB_SHORT_SEMNAMES 1 /* limited to 14 chars */
|
|
#endif
|
|
if (fstat(env->me_lfd, &stbuf)) goto fail_errno;
|
|
idbuf.dev = stbuf.st_dev;
|
|
idbuf.ino = stbuf.st_ino;
|
|
val.mv_data = &idbuf;
|
|
val.mv_size = sizeof(idbuf);
|
|
mdb_hash_enc(&val, encbuf);
|
|
#ifdef MDB_SHORT_SEMNAMES
|
|
encbuf[9] = '\0'; /* drop name from 15 chars to 14 chars */
|
|
#endif
|
|
sprintf(env->me_txns->mti_rmname, "/MDBr%s", encbuf);
|
|
sprintf(env->me_txns->mti_wmname, "/MDBw%s", encbuf);
|
|
/* Clean up after a previous run, if needed: Try to
|
|
* remove both semaphores before doing anything else.
|
|
*/
|
|
sem_unlink(env->me_txns->mti_rmname);
|
|
sem_unlink(env->me_txns->mti_wmname);
|
|
env->me_rmutex = sem_open(env->me_txns->mti_rmname,
|
|
O_CREAT|O_EXCL, mode, 1);
|
|
if (env->me_rmutex == SEM_FAILED) goto fail_errno;
|
|
env->me_wmutex = sem_open(env->me_txns->mti_wmname,
|
|
O_CREAT|O_EXCL, mode, 1);
|
|
if (env->me_wmutex == SEM_FAILED) goto fail_errno;
|
|
#else /* MDB_USE_POSIX_SEM */
|
|
pthread_mutexattr_t mattr;
|
|
|
|
if ((rc = pthread_mutexattr_init(&mattr))
|
|
|| (rc = pthread_mutexattr_setpshared(&mattr, PTHREAD_PROCESS_SHARED))
|
|
|| (rc = pthread_mutex_init(&env->me_txns->mti_mutex, &mattr))
|
|
|| (rc = pthread_mutex_init(&env->me_txns->mti_wmutex, &mattr)))
|
|
goto fail;
|
|
pthread_mutexattr_destroy(&mattr);
|
|
#endif /* _WIN32 || MDB_USE_POSIX_SEM */
|
|
|
|
env->me_txns->mti_magic = MDB_MAGIC;
|
|
env->me_txns->mti_format = MDB_LOCK_FORMAT;
|
|
env->me_txns->mti_txnid = 0;
|
|
env->me_txns->mti_numreaders = 0;
|
|
|
|
} else {
|
|
if (env->me_txns->mti_magic != MDB_MAGIC) {
|
|
DPUTS("lock region has invalid magic");
|
|
rc = MDB_INVALID;
|
|
goto fail;
|
|
}
|
|
if (env->me_txns->mti_format != MDB_LOCK_FORMAT) {
|
|
DPRINTF(("lock region has format+version 0x%x, expected 0x%x",
|
|
env->me_txns->mti_format, MDB_LOCK_FORMAT));
|
|
rc = MDB_VERSION_MISMATCH;
|
|
goto fail;
|
|
}
|
|
rc = ErrCode();
|
|
if (rc && rc != EACCES && rc != EAGAIN) {
|
|
goto fail;
|
|
}
|
|
#ifdef _WIN32
|
|
env->me_rmutex = OpenMutex(SYNCHRONIZE, FALSE, env->me_txns->mti_rmname);
|
|
if (!env->me_rmutex) goto fail_errno;
|
|
env->me_wmutex = OpenMutex(SYNCHRONIZE, FALSE, env->me_txns->mti_wmname);
|
|
if (!env->me_wmutex) goto fail_errno;
|
|
#elif defined(MDB_USE_POSIX_SEM)
|
|
env->me_rmutex = sem_open(env->me_txns->mti_rmname, 0);
|
|
if (env->me_rmutex == SEM_FAILED) goto fail_errno;
|
|
env->me_wmutex = sem_open(env->me_txns->mti_wmname, 0);
|
|
if (env->me_wmutex == SEM_FAILED) goto fail_errno;
|
|
#endif
|
|
}
|
|
return MDB_SUCCESS;
|
|
|
|
fail_errno:
|
|
rc = ErrCode();
|
|
fail:
|
|
return rc;
|
|
}
|
|
|
|
/** The name of the lock file in the DB environment */
|
|
#define LOCKNAME "/lock.mdb"
|
|
/** The name of the data file in the DB environment */
|
|
#define DATANAME "/data.mdb"
|
|
/** The suffix of the lock file when no subdir is used */
|
|
#define LOCKSUFF "-lock"
|
|
/** Only a subset of the @ref mdb_env flags can be changed
|
|
* at runtime. Changing other flags requires closing the
|
|
* environment and re-opening it with the new flags.
|
|
*/
|
|
#define CHANGEABLE (MDB_NOSYNC|MDB_NOMETASYNC|MDB_MAPASYNC)
|
|
#define CHANGELESS (MDB_FIXEDMAP|MDB_NOSUBDIR|MDB_RDONLY|MDB_WRITEMAP|MDB_NOTLS|MDB_NOLOCK)
|
|
|
|
int
|
|
mdb_env_open(MDB_env *env, const char *path, unsigned int flags, mdb_mode_t mode)
|
|
{
|
|
int oflags, rc, len, excl = -1;
|
|
char *lpath, *dpath;
|
|
|
|
if (env->me_fd!=INVALID_HANDLE_VALUE || (flags & ~(CHANGEABLE|CHANGELESS)))
|
|
return EINVAL;
|
|
|
|
len = strlen(path);
|
|
if (flags & MDB_NOSUBDIR) {
|
|
rc = len + sizeof(LOCKSUFF) + len + 1;
|
|
} else {
|
|
rc = len + sizeof(LOCKNAME) + len + sizeof(DATANAME);
|
|
}
|
|
lpath = malloc(rc);
|
|
if (!lpath)
|
|
return ENOMEM;
|
|
if (flags & MDB_NOSUBDIR) {
|
|
dpath = lpath + len + sizeof(LOCKSUFF);
|
|
sprintf(lpath, "%s" LOCKSUFF, path);
|
|
strcpy(dpath, path);
|
|
} else {
|
|
dpath = lpath + len + sizeof(LOCKNAME);
|
|
sprintf(lpath, "%s" LOCKNAME, path);
|
|
sprintf(dpath, "%s" DATANAME, path);
|
|
}
|
|
|
|
rc = MDB_SUCCESS;
|
|
flags |= env->me_flags;
|
|
if (flags & MDB_RDONLY) {
|
|
/* silently ignore WRITEMAP when we're only getting read access */
|
|
flags &= ~MDB_WRITEMAP;
|
|
} else {
|
|
if (!((env->me_free_pgs = mdb_midl_alloc(MDB_IDL_UM_MAX)) &&
|
|
(env->me_dirty_list = calloc(MDB_IDL_UM_SIZE, sizeof(MDB_ID2)))))
|
|
rc = ENOMEM;
|
|
}
|
|
env->me_flags = flags |= MDB_ENV_ACTIVE;
|
|
if (rc)
|
|
goto leave;
|
|
|
|
env->me_path = strdup(path);
|
|
env->me_dbxs = calloc(env->me_maxdbs, sizeof(MDB_dbx));
|
|
env->me_dbflags = calloc(env->me_maxdbs, sizeof(uint16_t));
|
|
if (!(env->me_dbxs && env->me_path && env->me_dbflags)) {
|
|
rc = ENOMEM;
|
|
goto leave;
|
|
}
|
|
|
|
/* For RDONLY, get lockfile after we know datafile exists */
|
|
if (!(flags & (MDB_RDONLY|MDB_NOLOCK))) {
|
|
rc = mdb_env_setup_locks(env, lpath, mode, &excl);
|
|
if (rc)
|
|
goto leave;
|
|
}
|
|
|
|
#ifdef _WIN32
|
|
if (F_ISSET(flags, MDB_RDONLY)) {
|
|
oflags = GENERIC_READ;
|
|
len = OPEN_EXISTING;
|
|
} else {
|
|
oflags = GENERIC_READ|GENERIC_WRITE;
|
|
len = OPEN_ALWAYS;
|
|
}
|
|
mode = FILE_ATTRIBUTE_NORMAL;
|
|
env->me_fd = CreateFile(dpath, oflags, FILE_SHARE_READ|FILE_SHARE_WRITE,
|
|
NULL, len, mode, NULL);
|
|
#else
|
|
if (F_ISSET(flags, MDB_RDONLY))
|
|
oflags = O_RDONLY;
|
|
else
|
|
oflags = O_RDWR | O_CREAT;
|
|
|
|
env->me_fd = open(dpath, oflags, mode);
|
|
#endif
|
|
if (env->me_fd == INVALID_HANDLE_VALUE) {
|
|
rc = ErrCode();
|
|
goto leave;
|
|
}
|
|
|
|
if ((flags & (MDB_RDONLY|MDB_NOLOCK)) == MDB_RDONLY) {
|
|
rc = mdb_env_setup_locks(env, lpath, mode, &excl);
|
|
if (rc)
|
|
goto leave;
|
|
}
|
|
|
|
if ((rc = mdb_env_open2(env)) == MDB_SUCCESS) {
|
|
if (flags & (MDB_RDONLY|MDB_WRITEMAP)) {
|
|
env->me_mfd = env->me_fd;
|
|
} else {
|
|
/* Synchronous fd for meta writes. Needed even with
|
|
* MDB_NOSYNC/MDB_NOMETASYNC, in case these get reset.
|
|
*/
|
|
#ifdef _WIN32
|
|
len = OPEN_EXISTING;
|
|
env->me_mfd = CreateFile(dpath, oflags,
|
|
FILE_SHARE_READ|FILE_SHARE_WRITE, NULL, len,
|
|
mode | FILE_FLAG_WRITE_THROUGH, NULL);
|
|
#else
|
|
oflags &= ~O_CREAT;
|
|
env->me_mfd = open(dpath, oflags | MDB_DSYNC, mode);
|
|
#endif
|
|
if (env->me_mfd == INVALID_HANDLE_VALUE) {
|
|
rc = ErrCode();
|
|
goto leave;
|
|
}
|
|
}
|
|
DPRINTF(("opened dbenv %p", (void *) env));
|
|
if (excl > 0) {
|
|
rc = mdb_env_share_locks(env, &excl);
|
|
}
|
|
}
|
|
|
|
leave:
|
|
if (rc) {
|
|
mdb_env_close0(env, excl);
|
|
}
|
|
free(lpath);
|
|
return rc;
|
|
}
|
|
|
|
/** Destroy resources from mdb_env_open(), clear our readers & DBIs */
|
|
static void
|
|
mdb_env_close0(MDB_env *env, int excl)
|
|
{
|
|
int i;
|
|
|
|
if (!(env->me_flags & MDB_ENV_ACTIVE))
|
|
return;
|
|
|
|
/* Doing this here since me_dbxs may not exist during mdb_env_close */
|
|
for (i = env->me_maxdbs; --i > MAIN_DBI; )
|
|
free(env->me_dbxs[i].md_name.mv_data);
|
|
|
|
free(env->me_dbflags);
|
|
free(env->me_dbxs);
|
|
free(env->me_path);
|
|
free(env->me_dirty_list);
|
|
mdb_midl_free(env->me_free_pgs);
|
|
|
|
if (env->me_flags & MDB_ENV_TXKEY) {
|
|
pthread_key_delete(env->me_txkey);
|
|
#ifdef _WIN32
|
|
/* Delete our key from the global list */
|
|
for (i=0; i<mdb_tls_nkeys; i++)
|
|
if (mdb_tls_keys[i] == env->me_txkey) {
|
|
mdb_tls_keys[i] = mdb_tls_keys[mdb_tls_nkeys-1];
|
|
mdb_tls_nkeys--;
|
|
break;
|
|
}
|
|
#endif
|
|
}
|
|
|
|
if (env->me_map) {
|
|
munmap(env->me_map, env->me_mapsize);
|
|
}
|
|
if (env->me_mfd != env->me_fd && env->me_mfd != INVALID_HANDLE_VALUE)
|
|
(void) close(env->me_mfd);
|
|
if (env->me_fd != INVALID_HANDLE_VALUE)
|
|
(void) close(env->me_fd);
|
|
if (env->me_txns) {
|
|
pid_t pid = env->me_pid;
|
|
/* Clearing readers is done in this function because
|
|
* me_txkey with its destructor must be disabled first.
|
|
*/
|
|
for (i = env->me_numreaders; --i >= 0; )
|
|
if (env->me_txns->mti_readers[i].mr_pid == pid)
|
|
env->me_txns->mti_readers[i].mr_pid = 0;
|
|
#ifdef _WIN32
|
|
if (env->me_rmutex) {
|
|
CloseHandle(env->me_rmutex);
|
|
if (env->me_wmutex) CloseHandle(env->me_wmutex);
|
|
}
|
|
/* Windows automatically destroys the mutexes when
|
|
* the last handle closes.
|
|
*/
|
|
#elif defined(MDB_USE_POSIX_SEM)
|
|
if (env->me_rmutex != SEM_FAILED) {
|
|
sem_close(env->me_rmutex);
|
|
if (env->me_wmutex != SEM_FAILED)
|
|
sem_close(env->me_wmutex);
|
|
/* If we have the filelock: If we are the
|
|
* only remaining user, clean up semaphores.
|
|
*/
|
|
if (excl == 0)
|
|
mdb_env_excl_lock(env, &excl);
|
|
if (excl > 0) {
|
|
sem_unlink(env->me_txns->mti_rmname);
|
|
sem_unlink(env->me_txns->mti_wmname);
|
|
}
|
|
}
|
|
#endif
|
|
munmap((void *)env->me_txns, (env->me_maxreaders-1)*sizeof(MDB_reader)+sizeof(MDB_txninfo));
|
|
}
|
|
if (env->me_lfd != INVALID_HANDLE_VALUE) {
|
|
#ifdef _WIN32
|
|
if (excl >= 0) {
|
|
/* Unlock the lockfile. Windows would have unlocked it
|
|
* after closing anyway, but not necessarily at once.
|
|
*/
|
|
UnlockFile(env->me_lfd, 0, 0, 1, 0);
|
|
}
|
|
#endif
|
|
(void) close(env->me_lfd);
|
|
}
|
|
|
|
env->me_flags &= ~(MDB_ENV_ACTIVE|MDB_ENV_TXKEY);
|
|
}
|
|
|
|
int
|
|
mdb_env_copyfd(MDB_env *env, HANDLE fd)
|
|
{
|
|
MDB_txn *txn = NULL;
|
|
int rc;
|
|
size_t wsize;
|
|
char *ptr;
|
|
#ifdef _WIN32
|
|
DWORD len, w2;
|
|
#define DO_WRITE(rc, fd, ptr, w2, len) rc = WriteFile(fd, ptr, w2, &len, NULL)
|
|
#else
|
|
ssize_t len;
|
|
size_t w2;
|
|
#define DO_WRITE(rc, fd, ptr, w2, len) len = write(fd, ptr, w2); rc = (len >= 0)
|
|
#endif
|
|
|
|
/* Do the lock/unlock of the reader mutex before starting the
|
|
* write txn. Otherwise other read txns could block writers.
|
|
*/
|
|
rc = mdb_txn_begin(env, NULL, MDB_RDONLY, &txn);
|
|
if (rc)
|
|
return rc;
|
|
|
|
if (env->me_txns) {
|
|
/* We must start the actual read txn after blocking writers */
|
|
mdb_txn_reset0(txn, "reset-stage1");
|
|
|
|
/* Temporarily block writers until we snapshot the meta pages */
|
|
LOCK_MUTEX_W(env);
|
|
|
|
rc = mdb_txn_renew0(txn);
|
|
if (rc) {
|
|
UNLOCK_MUTEX_W(env);
|
|
goto leave;
|
|
}
|
|
}
|
|
|
|
wsize = env->me_psize * 2;
|
|
ptr = env->me_map;
|
|
w2 = wsize;
|
|
while (w2 > 0) {
|
|
DO_WRITE(rc, fd, ptr, w2, len);
|
|
if (!rc) {
|
|
rc = ErrCode();
|
|
break;
|
|
} else if (len > 0) {
|
|
rc = MDB_SUCCESS;
|
|
ptr += len;
|
|
w2 -= len;
|
|
continue;
|
|
} else {
|
|
/* Non-blocking or async handles are not supported */
|
|
rc = EIO;
|
|
break;
|
|
}
|
|
}
|
|
if (env->me_txns)
|
|
UNLOCK_MUTEX_W(env);
|
|
|
|
if (rc)
|
|
goto leave;
|
|
|
|
wsize = txn->mt_next_pgno * env->me_psize - wsize;
|
|
while (wsize > 0) {
|
|
if (wsize > MAX_WRITE)
|
|
w2 = MAX_WRITE;
|
|
else
|
|
w2 = wsize;
|
|
DO_WRITE(rc, fd, ptr, w2, len);
|
|
if (!rc) {
|
|
rc = ErrCode();
|
|
break;
|
|
} else if (len > 0) {
|
|
rc = MDB_SUCCESS;
|
|
ptr += len;
|
|
wsize -= len;
|
|
continue;
|
|
} else {
|
|
rc = EIO;
|
|
break;
|
|
}
|
|
}
|
|
|
|
leave:
|
|
mdb_txn_abort(txn);
|
|
return rc;
|
|
}
|
|
|
|
int
|
|
mdb_env_copy(MDB_env *env, const char *path)
|
|
{
|
|
int rc, len;
|
|
char *lpath;
|
|
HANDLE newfd = INVALID_HANDLE_VALUE;
|
|
|
|
if (env->me_flags & MDB_NOSUBDIR) {
|
|
lpath = (char *)path;
|
|
} else {
|
|
len = strlen(path);
|
|
len += sizeof(DATANAME);
|
|
lpath = malloc(len);
|
|
if (!lpath)
|
|
return ENOMEM;
|
|
sprintf(lpath, "%s" DATANAME, path);
|
|
}
|
|
|
|
/* The destination path must exist, but the destination file must not.
|
|
* We don't want the OS to cache the writes, since the source data is
|
|
* already in the OS cache.
|
|
*/
|
|
#ifdef _WIN32
|
|
newfd = CreateFile(lpath, GENERIC_WRITE, 0, NULL, CREATE_NEW,
|
|
FILE_FLAG_NO_BUFFERING|FILE_FLAG_WRITE_THROUGH, NULL);
|
|
#else
|
|
newfd = open(lpath, O_WRONLY|O_CREAT|O_EXCL, 0666);
|
|
#endif
|
|
if (newfd == INVALID_HANDLE_VALUE) {
|
|
rc = ErrCode();
|
|
goto leave;
|
|
}
|
|
|
|
#ifdef O_DIRECT
|
|
/* Set O_DIRECT if the file system supports it */
|
|
if ((rc = fcntl(newfd, F_GETFL)) != -1)
|
|
(void) fcntl(newfd, F_SETFL, rc | O_DIRECT);
|
|
#endif
|
|
#ifdef F_NOCACHE /* __APPLE__ */
|
|
rc = fcntl(newfd, F_NOCACHE, 1);
|
|
if (rc) {
|
|
rc = ErrCode();
|
|
goto leave;
|
|
}
|
|
#endif
|
|
|
|
rc = mdb_env_copyfd(env, newfd);
|
|
|
|
leave:
|
|
if (!(env->me_flags & MDB_NOSUBDIR))
|
|
free(lpath);
|
|
if (newfd != INVALID_HANDLE_VALUE)
|
|
if (close(newfd) < 0 && rc == MDB_SUCCESS)
|
|
rc = ErrCode();
|
|
|
|
return rc;
|
|
}
|
|
|
|
void
|
|
mdb_env_close(MDB_env *env)
|
|
{
|
|
MDB_page *dp;
|
|
|
|
if (env == NULL)
|
|
return;
|
|
|
|
VGMEMP_DESTROY(env);
|
|
while ((dp = env->me_dpages) != NULL) {
|
|
VGMEMP_DEFINED(&dp->mp_next, sizeof(dp->mp_next));
|
|
env->me_dpages = dp->mp_next;
|
|
free(dp);
|
|
}
|
|
|
|
mdb_env_close0(env, 0);
|
|
free(env);
|
|
}
|
|
|
|
/** Compare two items pointing at aligned size_t's */
|
|
static int
|
|
mdb_cmp_long(const MDB_val *a, const MDB_val *b)
|
|
{
|
|
return (*(size_t *)a->mv_data < *(size_t *)b->mv_data) ? -1 :
|
|
*(size_t *)a->mv_data > *(size_t *)b->mv_data;
|
|
}
|
|
|
|
/** Compare two items pointing at aligned unsigned int's */
|
|
static int
|
|
mdb_cmp_int(const MDB_val *a, const MDB_val *b)
|
|
{
|
|
return (*(unsigned int *)a->mv_data < *(unsigned int *)b->mv_data) ? -1 :
|
|
*(unsigned int *)a->mv_data > *(unsigned int *)b->mv_data;
|
|
}
|
|
|
|
/** Compare two items pointing at unsigned ints of unknown alignment.
|
|
* Nodes and keys are guaranteed to be 2-byte aligned.
|
|
*/
|
|
static int
|
|
mdb_cmp_cint(const MDB_val *a, const MDB_val *b)
|
|
{
|
|
#if BYTE_ORDER == LITTLE_ENDIAN
|
|
unsigned short *u, *c;
|
|
int x;
|
|
|
|
u = (unsigned short *) ((char *) a->mv_data + a->mv_size);
|
|
c = (unsigned short *) ((char *) b->mv_data + a->mv_size);
|
|
do {
|
|
x = *--u - *--c;
|
|
} while(!x && u > (unsigned short *)a->mv_data);
|
|
return x;
|
|
#else
|
|
return memcmp(a->mv_data, b->mv_data, a->mv_size);
|
|
#endif
|
|
}
|
|
|
|
/** Compare two items lexically */
|
|
static int
|
|
mdb_cmp_memn(const MDB_val *a, const MDB_val *b)
|
|
{
|
|
int diff;
|
|
ssize_t len_diff;
|
|
unsigned int len;
|
|
|
|
len = a->mv_size;
|
|
len_diff = (ssize_t) a->mv_size - (ssize_t) b->mv_size;
|
|
if (len_diff > 0) {
|
|
len = b->mv_size;
|
|
len_diff = 1;
|
|
}
|
|
|
|
diff = memcmp(a->mv_data, b->mv_data, len);
|
|
return diff ? diff : len_diff<0 ? -1 : len_diff;
|
|
}
|
|
|
|
/** Compare two items in reverse byte order */
|
|
static int
|
|
mdb_cmp_memnr(const MDB_val *a, const MDB_val *b)
|
|
{
|
|
const unsigned char *p1, *p2, *p1_lim;
|
|
ssize_t len_diff;
|
|
int diff;
|
|
|
|
p1_lim = (const unsigned char *)a->mv_data;
|
|
p1 = (const unsigned char *)a->mv_data + a->mv_size;
|
|
p2 = (const unsigned char *)b->mv_data + b->mv_size;
|
|
|
|
len_diff = (ssize_t) a->mv_size - (ssize_t) b->mv_size;
|
|
if (len_diff > 0) {
|
|
p1_lim += len_diff;
|
|
len_diff = 1;
|
|
}
|
|
|
|
while (p1 > p1_lim) {
|
|
diff = *--p1 - *--p2;
|
|
if (diff)
|
|
return diff;
|
|
}
|
|
return len_diff<0 ? -1 : len_diff;
|
|
}
|
|
|
|
/** Search for key within a page, using binary search.
|
|
* Returns the smallest entry larger or equal to the key.
|
|
* If exactp is non-null, stores whether the found entry was an exact match
|
|
* in *exactp (1 or 0).
|
|
* Updates the cursor index with the index of the found entry.
|
|
* If no entry larger or equal to the key is found, returns NULL.
|
|
*/
|
|
static MDB_node *
|
|
mdb_node_search(MDB_cursor *mc, MDB_val *key, int *exactp)
|
|
{
|
|
unsigned int i = 0, nkeys;
|
|
int low, high;
|
|
int rc = 0;
|
|
MDB_page *mp = mc->mc_pg[mc->mc_top];
|
|
MDB_node *node = NULL;
|
|
MDB_val nodekey;
|
|
MDB_cmp_func *cmp;
|
|
DKBUF;
|
|
|
|
nkeys = NUMKEYS(mp);
|
|
|
|
#if MDB_DEBUG
|
|
{
|
|
pgno_t pgno;
|
|
COPY_PGNO(pgno, mp->mp_pgno);
|
|
DPRINTF(("searching %u keys in %s %spage %"Z"u",
|
|
nkeys, IS_LEAF(mp) ? "leaf" : "branch", IS_SUBP(mp) ? "sub-" : "",
|
|
pgno));
|
|
}
|
|
#endif
|
|
|
|
assert(nkeys > 0);
|
|
|
|
low = IS_LEAF(mp) ? 0 : 1;
|
|
high = nkeys - 1;
|
|
cmp = mc->mc_dbx->md_cmp;
|
|
|
|
/* Branch pages have no data, so if using integer keys,
|
|
* alignment is guaranteed. Use faster mdb_cmp_int.
|
|
*/
|
|
if (cmp == mdb_cmp_cint && IS_BRANCH(mp)) {
|
|
if (NODEPTR(mp, 1)->mn_ksize == sizeof(size_t))
|
|
cmp = mdb_cmp_long;
|
|
else
|
|
cmp = mdb_cmp_int;
|
|
}
|
|
|
|
if (IS_LEAF2(mp)) {
|
|
nodekey.mv_size = mc->mc_db->md_pad;
|
|
node = NODEPTR(mp, 0); /* fake */
|
|
while (low <= high) {
|
|
i = (low + high) >> 1;
|
|
nodekey.mv_data = LEAF2KEY(mp, i, nodekey.mv_size);
|
|
rc = cmp(key, &nodekey);
|
|
DPRINTF(("found leaf index %u [%s], rc = %i",
|
|
i, DKEY(&nodekey), rc));
|
|
if (rc == 0)
|
|
break;
|
|
if (rc > 0)
|
|
low = i + 1;
|
|
else
|
|
high = i - 1;
|
|
}
|
|
} else {
|
|
while (low <= high) {
|
|
i = (low + high) >> 1;
|
|
|
|
node = NODEPTR(mp, i);
|
|
nodekey.mv_size = NODEKSZ(node);
|
|
nodekey.mv_data = NODEKEY(node);
|
|
|
|
rc = cmp(key, &nodekey);
|
|
#if MDB_DEBUG
|
|
if (IS_LEAF(mp))
|
|
DPRINTF(("found leaf index %u [%s], rc = %i",
|
|
i, DKEY(&nodekey), rc));
|
|
else
|
|
DPRINTF(("found branch index %u [%s -> %"Z"u], rc = %i",
|
|
i, DKEY(&nodekey), NODEPGNO(node), rc));
|
|
#endif
|
|
if (rc == 0)
|
|
break;
|
|
if (rc > 0)
|
|
low = i + 1;
|
|
else
|
|
high = i - 1;
|
|
}
|
|
}
|
|
|
|
if (rc > 0) { /* Found entry is less than the key. */
|
|
i++; /* Skip to get the smallest entry larger than key. */
|
|
if (!IS_LEAF2(mp))
|
|
node = NODEPTR(mp, i);
|
|
}
|
|
if (exactp)
|
|
*exactp = (rc == 0);
|
|
/* store the key index */
|
|
mc->mc_ki[mc->mc_top] = i;
|
|
if (i >= nkeys)
|
|
/* There is no entry larger or equal to the key. */
|
|
return NULL;
|
|
|
|
/* nodeptr is fake for LEAF2 */
|
|
return node;
|
|
}
|
|
|
|
#if 0
|
|
static void
|
|
mdb_cursor_adjust(MDB_cursor *mc, func)
|
|
{
|
|
MDB_cursor *m2;
|
|
|
|
for (m2 = mc->mc_txn->mt_cursors[mc->mc_dbi]; m2; m2=m2->mc_next) {
|
|
if (m2->mc_pg[m2->mc_top] == mc->mc_pg[mc->mc_top]) {
|
|
func(mc, m2);
|
|
}
|
|
}
|
|
}
|
|
#endif
|
|
|
|
/** Pop a page off the top of the cursor's stack. */
|
|
static void
|
|
mdb_cursor_pop(MDB_cursor *mc)
|
|
{
|
|
if (mc->mc_snum) {
|
|
#if MDB_DEBUG
|
|
MDB_page *top = mc->mc_pg[mc->mc_top];
|
|
#endif
|
|
mc->mc_snum--;
|
|
if (mc->mc_snum)
|
|
mc->mc_top--;
|
|
|
|
DPRINTF(("popped page %"Z"u off db %d cursor %p", top->mp_pgno,
|
|
DDBI(mc), (void *) mc));
|
|
}
|
|
}
|
|
|
|
/** Push a page onto the top of the cursor's stack. */
|
|
static int
|
|
mdb_cursor_push(MDB_cursor *mc, MDB_page *mp)
|
|
{
|
|
DPRINTF(("pushing page %"Z"u on db %d cursor %p", mp->mp_pgno,
|
|
DDBI(mc), (void *) mc));
|
|
|
|
if (mc->mc_snum >= CURSOR_STACK) {
|
|
assert(mc->mc_snum < CURSOR_STACK);
|
|
return MDB_CURSOR_FULL;
|
|
}
|
|
|
|
mc->mc_top = mc->mc_snum++;
|
|
mc->mc_pg[mc->mc_top] = mp;
|
|
mc->mc_ki[mc->mc_top] = 0;
|
|
|
|
return MDB_SUCCESS;
|
|
}
|
|
|
|
/** Find the address of the page corresponding to a given page number.
|
|
* @param[in] txn the transaction for this access.
|
|
* @param[in] pgno the page number for the page to retrieve.
|
|
* @param[out] ret address of a pointer where the page's address will be stored.
|
|
* @param[out] lvl dirty_list inheritance level of found page. 1=current txn, 0=mapped page.
|
|
* @return 0 on success, non-zero on failure.
|
|
*/
|
|
static int
|
|
mdb_page_get(MDB_txn *txn, pgno_t pgno, MDB_page **ret, int *lvl)
|
|
{
|
|
MDB_env *env = txn->mt_env;
|
|
MDB_page *p = NULL;
|
|
int level;
|
|
|
|
if (!((txn->mt_flags & MDB_TXN_RDONLY) | (env->me_flags & MDB_WRITEMAP))) {
|
|
MDB_txn *tx2 = txn;
|
|
level = 1;
|
|
do {
|
|
MDB_ID2L dl = tx2->mt_u.dirty_list;
|
|
unsigned x;
|
|
/* Spilled pages were dirtied in this txn and flushed
|
|
* because the dirty list got full. Bring this page
|
|
* back in from the map (but don't unspill it here,
|
|
* leave that unless page_touch happens again).
|
|
*/
|
|
if (tx2->mt_spill_pgs) {
|
|
MDB_ID pn = pgno << 1;
|
|
x = mdb_midl_search(tx2->mt_spill_pgs, pn);
|
|
if (x <= tx2->mt_spill_pgs[0] && tx2->mt_spill_pgs[x] == pn) {
|
|
p = (MDB_page *)(env->me_map + env->me_psize * pgno);
|
|
goto done;
|
|
}
|
|
}
|
|
if (dl[0].mid) {
|
|
unsigned x = mdb_mid2l_search(dl, pgno);
|
|
if (x <= dl[0].mid && dl[x].mid == pgno) {
|
|
p = dl[x].mptr;
|
|
goto done;
|
|
}
|
|
}
|
|
level++;
|
|
} while ((tx2 = tx2->mt_parent) != NULL);
|
|
}
|
|
|
|
if (pgno < txn->mt_next_pgno) {
|
|
level = 0;
|
|
p = (MDB_page *)(env->me_map + env->me_psize * pgno);
|
|
} else {
|
|
DPRINTF(("page %"Z"u not found", pgno));
|
|
assert(p != NULL);
|
|
return MDB_PAGE_NOTFOUND;
|
|
}
|
|
|
|
done:
|
|
*ret = p;
|
|
if (lvl)
|
|
*lvl = level;
|
|
return MDB_SUCCESS;
|
|
}
|
|
|
|
/** Finish #mdb_page_search() / #mdb_page_search_lowest().
|
|
* The cursor is at the root page, set up the rest of it.
|
|
*/
|
|
static int
|
|
mdb_page_search_root(MDB_cursor *mc, MDB_val *key, int flags)
|
|
{
|
|
MDB_page *mp = mc->mc_pg[mc->mc_top];
|
|
int rc;
|
|
DKBUF;
|
|
|
|
while (IS_BRANCH(mp)) {
|
|
MDB_node *node;
|
|
indx_t i;
|
|
|
|
DPRINTF(("branch page %"Z"u has %u keys", mp->mp_pgno, NUMKEYS(mp)));
|
|
assert(NUMKEYS(mp) > 1);
|
|
DPRINTF(("found index 0 to page %"Z"u", NODEPGNO(NODEPTR(mp, 0))));
|
|
|
|
if (flags & (MDB_PS_FIRST|MDB_PS_LAST)) {
|
|
i = 0;
|
|
if (flags & MDB_PS_LAST)
|
|
i = NUMKEYS(mp) - 1;
|
|
} else {
|
|
int exact;
|
|
node = mdb_node_search(mc, key, &exact);
|
|
if (node == NULL)
|
|
i = NUMKEYS(mp) - 1;
|
|
else {
|
|
i = mc->mc_ki[mc->mc_top];
|
|
if (!exact) {
|
|
assert(i > 0);
|
|
i--;
|
|
}
|
|
}
|
|
DPRINTF(("following index %u for key [%s]", i, DKEY(key)));
|
|
}
|
|
|
|
assert(i < NUMKEYS(mp));
|
|
node = NODEPTR(mp, i);
|
|
|
|
if ((rc = mdb_page_get(mc->mc_txn, NODEPGNO(node), &mp, NULL)) != 0)
|
|
return rc;
|
|
|
|
mc->mc_ki[mc->mc_top] = i;
|
|
if ((rc = mdb_cursor_push(mc, mp)))
|
|
return rc;
|
|
|
|
if (flags & MDB_PS_MODIFY) {
|
|
if ((rc = mdb_page_touch(mc)) != 0)
|
|
return rc;
|
|
mp = mc->mc_pg[mc->mc_top];
|
|
}
|
|
}
|
|
|
|
if (!IS_LEAF(mp)) {
|
|
DPRINTF(("internal error, index points to a %02X page!?",
|
|
mp->mp_flags));
|
|
return MDB_CORRUPTED;
|
|
}
|
|
|
|
DPRINTF(("found leaf page %"Z"u for key [%s]", mp->mp_pgno,
|
|
key ? DKEY(key) : "null"));
|
|
mc->mc_flags |= C_INITIALIZED;
|
|
mc->mc_flags &= ~C_EOF;
|
|
|
|
return MDB_SUCCESS;
|
|
}
|
|
|
|
/** Search for the lowest key under the current branch page.
|
|
* This just bypasses a NUMKEYS check in the current page
|
|
* before calling mdb_page_search_root(), because the callers
|
|
* are all in situations where the current page is known to
|
|
* be underfilled.
|
|
*/
|
|
static int
|
|
mdb_page_search_lowest(MDB_cursor *mc)
|
|
{
|
|
MDB_page *mp = mc->mc_pg[mc->mc_top];
|
|
MDB_node *node = NODEPTR(mp, 0);
|
|
int rc;
|
|
|
|
if ((rc = mdb_page_get(mc->mc_txn, NODEPGNO(node), &mp, NULL)) != 0)
|
|
return rc;
|
|
|
|
mc->mc_ki[mc->mc_top] = 0;
|
|
if ((rc = mdb_cursor_push(mc, mp)))
|
|
return rc;
|
|
return mdb_page_search_root(mc, NULL, MDB_PS_FIRST);
|
|
}
|
|
|
|
/** Search for the page a given key should be in.
|
|
* Push it and its parent pages on the cursor stack.
|
|
* @param[in,out] mc the cursor for this operation.
|
|
* @param[in] key the key to search for, or NULL for first/last page.
|
|
* @param[in] flags If MDB_PS_MODIFY is set, visited pages in the DB
|
|
* are touched (updated with new page numbers).
|
|
* If MDB_PS_FIRST or MDB_PS_LAST is set, find first or last leaf.
|
|
* This is used by #mdb_cursor_first() and #mdb_cursor_last().
|
|
* If MDB_PS_ROOTONLY set, just fetch root node, no further lookups.
|
|
* @return 0 on success, non-zero on failure.
|
|
*/
|
|
static int
|
|
mdb_page_search(MDB_cursor *mc, MDB_val *key, int flags)
|
|
{
|
|
int rc;
|
|
pgno_t root;
|
|
|
|
/* Make sure the txn is still viable, then find the root from
|
|
* the txn's db table and set it as the root of the cursor's stack.
|
|
*/
|
|
if (F_ISSET(mc->mc_txn->mt_flags, MDB_TXN_ERROR)) {
|
|
DPUTS("transaction has failed, must abort");
|
|
return MDB_BAD_TXN;
|
|
} else {
|
|
/* Make sure we're using an up-to-date root */
|
|
if (*mc->mc_dbflag & DB_STALE) {
|
|
MDB_cursor mc2;
|
|
mdb_cursor_init(&mc2, mc->mc_txn, MAIN_DBI, NULL);
|
|
rc = mdb_page_search(&mc2, &mc->mc_dbx->md_name, 0);
|
|
if (rc)
|
|
return rc;
|
|
{
|
|
MDB_val data;
|
|
int exact = 0;
|
|
uint16_t flags;
|
|
MDB_node *leaf = mdb_node_search(&mc2,
|
|
&mc->mc_dbx->md_name, &exact);
|
|
if (!exact)
|
|
return MDB_NOTFOUND;
|
|
rc = mdb_node_read(mc->mc_txn, leaf, &data);
|
|
if (rc)
|
|
return rc;
|
|
memcpy(&flags, ((char *) data.mv_data + offsetof(MDB_db, md_flags)),
|
|
sizeof(uint16_t));
|
|
/* The txn may not know this DBI, or another process may
|
|
* have dropped and recreated the DB with other flags.
|
|
*/
|
|
if ((mc->mc_db->md_flags & PERSISTENT_FLAGS) != flags)
|
|
return MDB_INCOMPATIBLE;
|
|
memcpy(mc->mc_db, data.mv_data, sizeof(MDB_db));
|
|
}
|
|
*mc->mc_dbflag &= ~DB_STALE;
|
|
}
|
|
root = mc->mc_db->md_root;
|
|
|
|
if (root == P_INVALID) { /* Tree is empty. */
|
|
DPUTS("tree is empty");
|
|
return MDB_NOTFOUND;
|
|
}
|
|
}
|
|
|
|
assert(root > 1);
|
|
if (!mc->mc_pg[0] || mc->mc_pg[0]->mp_pgno != root)
|
|
if ((rc = mdb_page_get(mc->mc_txn, root, &mc->mc_pg[0], NULL)) != 0)
|
|
return rc;
|
|
|
|
mc->mc_snum = 1;
|
|
mc->mc_top = 0;
|
|
|
|
DPRINTF(("db %d root page %"Z"u has flags 0x%X",
|
|
DDBI(mc), root, mc->mc_pg[0]->mp_flags));
|
|
|
|
if (flags & MDB_PS_MODIFY) {
|
|
if ((rc = mdb_page_touch(mc)))
|
|
return rc;
|
|
}
|
|
|
|
if (flags & MDB_PS_ROOTONLY)
|
|
return MDB_SUCCESS;
|
|
|
|
return mdb_page_search_root(mc, key, flags);
|
|
}
|
|
|
|
static int
|
|
mdb_ovpage_free(MDB_cursor *mc, MDB_page *mp)
|
|
{
|
|
MDB_txn *txn = mc->mc_txn;
|
|
pgno_t pg = mp->mp_pgno;
|
|
unsigned x = 0, ovpages = mp->mp_pages;
|
|
MDB_env *env = txn->mt_env;
|
|
MDB_IDL sl = txn->mt_spill_pgs;
|
|
MDB_ID pn = pg << 1;
|
|
int rc;
|
|
|
|
DPRINTF(("free ov page %"Z"u (%d)", pg, ovpages));
|
|
/* If the page is dirty or on the spill list we just acquired it,
|
|
* so we should give it back to our current free list, if any.
|
|
* Otherwise put it onto the list of pages we freed in this txn.
|
|
*
|
|
* Won't create me_pghead: me_pglast must be inited along with it.
|
|
* Unsupported in nested txns: They would need to hide the page
|
|
* range in ancestor txns' dirty and spilled lists.
|
|
*/
|
|
if (env->me_pghead &&
|
|
!txn->mt_parent &&
|
|
((mp->mp_flags & P_DIRTY) ||
|
|
(sl && (x = mdb_midl_search(sl, pn)) <= sl[0] && sl[x] == pn)))
|
|
{
|
|
unsigned i, j;
|
|
pgno_t *mop;
|
|
MDB_ID2 *dl, ix, iy;
|
|
rc = mdb_midl_need(&env->me_pghead, ovpages);
|
|
if (rc)
|
|
return rc;
|
|
if (!(mp->mp_flags & P_DIRTY)) {
|
|
/* This page is no longer spilled */
|
|
if (x == sl[0])
|
|
sl[0]--;
|
|
else
|
|
sl[x] |= 1;
|
|
goto release;
|
|
}
|
|
/* Remove from dirty list */
|
|
dl = txn->mt_u.dirty_list;
|
|
x = dl[0].mid--;
|
|
for (ix = dl[x]; ix.mptr != mp; ix = iy) {
|
|
if (x > 1) {
|
|
x--;
|
|
iy = dl[x];
|
|
dl[x] = ix;
|
|
} else {
|
|
assert(x > 1);
|
|
j = ++(dl[0].mid);
|
|
dl[j] = ix; /* Unsorted. OK when MDB_TXN_ERROR. */
|
|
txn->mt_flags |= MDB_TXN_ERROR;
|
|
return MDB_CORRUPTED;
|
|
}
|
|
}
|
|
if (!(env->me_flags & MDB_WRITEMAP))
|
|
mdb_dpage_free(env, mp);
|
|
release:
|
|
/* Insert in me_pghead */
|
|
mop = env->me_pghead;
|
|
j = mop[0] + ovpages;
|
|
for (i = mop[0]; i && mop[i] < pg; i--)
|
|
mop[j--] = mop[i];
|
|
while (j>i)
|
|
mop[j--] = pg++;
|
|
mop[0] += ovpages;
|
|
} else {
|
|
rc = mdb_midl_append_range(&txn->mt_free_pgs, pg, ovpages);
|
|
if (rc)
|
|
return rc;
|
|
}
|
|
mc->mc_db->md_overflow_pages -= ovpages;
|
|
return 0;
|
|
}
|
|
|
|
/** Return the data associated with a given node.
|
|
* @param[in] txn The transaction for this operation.
|
|
* @param[in] leaf The node being read.
|
|
* @param[out] data Updated to point to the node's data.
|
|
* @return 0 on success, non-zero on failure.
|
|
*/
|
|
static int
|
|
mdb_node_read(MDB_txn *txn, MDB_node *leaf, MDB_val *data)
|
|
{
|
|
MDB_page *omp; /* overflow page */
|
|
pgno_t pgno;
|
|
int rc;
|
|
|
|
if (!F_ISSET(leaf->mn_flags, F_BIGDATA)) {
|
|
data->mv_size = NODEDSZ(leaf);
|
|
data->mv_data = NODEDATA(leaf);
|
|
return MDB_SUCCESS;
|
|
}
|
|
|
|
/* Read overflow data.
|
|
*/
|
|
data->mv_size = NODEDSZ(leaf);
|
|
memcpy(&pgno, NODEDATA(leaf), sizeof(pgno));
|
|
if ((rc = mdb_page_get(txn, pgno, &omp, NULL)) != 0) {
|
|
DPRINTF(("read overflow page %"Z"u failed", pgno));
|
|
return rc;
|
|
}
|
|
data->mv_data = METADATA(omp);
|
|
|
|
return MDB_SUCCESS;
|
|
}
|
|
|
|
int
|
|
mdb_get(MDB_txn *txn, MDB_dbi dbi,
|
|
MDB_val *key, MDB_val *data)
|
|
{
|
|
MDB_cursor mc;
|
|
MDB_xcursor mx;
|
|
int exact = 0;
|
|
DKBUF;
|
|
|
|
assert(key);
|
|
assert(data);
|
|
DPRINTF(("===> get db %u key [%s]", dbi, DKEY(key)));
|
|
|
|
if (txn == NULL || !dbi || dbi >= txn->mt_numdbs || !(txn->mt_dbflags[dbi] & DB_VALID))
|
|
return EINVAL;
|
|
|
|
if (txn->mt_flags & MDB_TXN_ERROR)
|
|
return MDB_BAD_TXN;
|
|
|
|
if (key->mv_size > MDB_MAXKEYSIZE) {
|
|
return MDB_BAD_VALSIZE;
|
|
}
|
|
|
|
mdb_cursor_init(&mc, txn, dbi, &mx);
|
|
return mdb_cursor_set(&mc, key, data, MDB_SET, &exact);
|
|
}
|
|
|
|
/** Find a sibling for a page.
|
|
* Replaces the page at the top of the cursor's stack with the
|
|
* specified sibling, if one exists.
|
|
* @param[in] mc The cursor for this operation.
|
|
* @param[in] move_right Non-zero if the right sibling is requested,
|
|
* otherwise the left sibling.
|
|
* @return 0 on success, non-zero on failure.
|
|
*/
|
|
static int
|
|
mdb_cursor_sibling(MDB_cursor *mc, int move_right)
|
|
{
|
|
int rc;
|
|
MDB_node *indx;
|
|
MDB_page *mp;
|
|
|
|
if (mc->mc_snum < 2) {
|
|
return MDB_NOTFOUND; /* root has no siblings */
|
|
}
|
|
|
|
mdb_cursor_pop(mc);
|
|
DPRINTF(("parent page is page %"Z"u, index %u",
|
|
mc->mc_pg[mc->mc_top]->mp_pgno, mc->mc_ki[mc->mc_top]));
|
|
|
|
if (move_right ? (mc->mc_ki[mc->mc_top] + 1u >= NUMKEYS(mc->mc_pg[mc->mc_top]))
|
|
: (mc->mc_ki[mc->mc_top] == 0)) {
|
|
DPRINTF(("no more keys left, moving to %s sibling",
|
|
move_right ? "right" : "left"));
|
|
if ((rc = mdb_cursor_sibling(mc, move_right)) != MDB_SUCCESS) {
|
|
/* undo cursor_pop before returning */
|
|
mc->mc_top++;
|
|
mc->mc_snum++;
|
|
return rc;
|
|
}
|
|
} else {
|
|
if (move_right)
|
|
mc->mc_ki[mc->mc_top]++;
|
|
else
|
|
mc->mc_ki[mc->mc_top]--;
|
|
DPRINTF(("just moving to %s index key %u",
|
|
move_right ? "right" : "left", mc->mc_ki[mc->mc_top]));
|
|
}
|
|
assert(IS_BRANCH(mc->mc_pg[mc->mc_top]));
|
|
|
|
indx = NODEPTR(mc->mc_pg[mc->mc_top], mc->mc_ki[mc->mc_top]);
|
|
if ((rc = mdb_page_get(mc->mc_txn, NODEPGNO(indx), &mp, NULL) != 0))
|
|
return rc;
|
|
|
|
mdb_cursor_push(mc, mp);
|
|
if (!move_right)
|
|
mc->mc_ki[mc->mc_top] = NUMKEYS(mp)-1;
|
|
|
|
return MDB_SUCCESS;
|
|
}
|
|
|
|
/** Move the cursor to the next data item. */
|
|
static int
|
|
mdb_cursor_next(MDB_cursor *mc, MDB_val *key, MDB_val *data, MDB_cursor_op op)
|
|
{
|
|
MDB_page *mp;
|
|
MDB_node *leaf;
|
|
int rc;
|
|
|
|
if (mc->mc_flags & C_EOF) {
|
|
return MDB_NOTFOUND;
|
|
}
|
|
|
|
assert(mc->mc_flags & C_INITIALIZED);
|
|
|
|
mp = mc->mc_pg[mc->mc_top];
|
|
|
|
if (mc->mc_db->md_flags & MDB_DUPSORT) {
|
|
leaf = NODEPTR(mp, mc->mc_ki[mc->mc_top]);
|
|
if (F_ISSET(leaf->mn_flags, F_DUPDATA)) {
|
|
if (op == MDB_NEXT || op == MDB_NEXT_DUP) {
|
|
rc = mdb_cursor_next(&mc->mc_xcursor->mx_cursor, data, NULL, MDB_NEXT);
|
|
if (op != MDB_NEXT || rc != MDB_NOTFOUND) {
|
|
if (rc == MDB_SUCCESS)
|
|
MDB_GET_KEY(leaf, key);
|
|
return rc;
|
|
}
|
|
}
|
|
} else {
|
|
mc->mc_xcursor->mx_cursor.mc_flags &= ~(C_INITIALIZED|C_EOF);
|
|
if (op == MDB_NEXT_DUP)
|
|
return MDB_NOTFOUND;
|
|
}
|
|
}
|
|
|
|
DPRINTF(("cursor_next: top page is %"Z"u in cursor %p", mp->mp_pgno, (void *) mc));
|
|
if (mc->mc_flags & C_DEL)
|
|
goto skip;
|
|
|
|
if (mc->mc_ki[mc->mc_top] + 1u >= NUMKEYS(mp)) {
|
|
DPUTS("=====> move to next sibling page");
|
|
if ((rc = mdb_cursor_sibling(mc, 1)) != MDB_SUCCESS) {
|
|
mc->mc_flags |= C_EOF;
|
|
return rc;
|
|
}
|
|
mp = mc->mc_pg[mc->mc_top];
|
|
DPRINTF(("next page is %"Z"u, key index %u", mp->mp_pgno, mc->mc_ki[mc->mc_top]));
|
|
} else
|
|
mc->mc_ki[mc->mc_top]++;
|
|
|
|
skip:
|
|
DPRINTF(("==> cursor points to page %"Z"u with %u keys, key index %u",
|
|
mp->mp_pgno, NUMKEYS(mp), mc->mc_ki[mc->mc_top]));
|
|
|
|
if (IS_LEAF2(mp)) {
|
|
key->mv_size = mc->mc_db->md_pad;
|
|
key->mv_data = LEAF2KEY(mp, mc->mc_ki[mc->mc_top], key->mv_size);
|
|
return MDB_SUCCESS;
|
|
}
|
|
|
|
assert(IS_LEAF(mp));
|
|
leaf = NODEPTR(mp, mc->mc_ki[mc->mc_top]);
|
|
|
|
if (F_ISSET(leaf->mn_flags, F_DUPDATA)) {
|
|
mdb_xcursor_init1(mc, leaf);
|
|
}
|
|
if (data) {
|
|
if ((rc = mdb_node_read(mc->mc_txn, leaf, data)) != MDB_SUCCESS)
|
|
return rc;
|
|
|
|
if (F_ISSET(leaf->mn_flags, F_DUPDATA)) {
|
|
rc = mdb_cursor_first(&mc->mc_xcursor->mx_cursor, data, NULL);
|
|
if (rc != MDB_SUCCESS)
|
|
return rc;
|
|
}
|
|
}
|
|
|
|
MDB_GET_KEY(leaf, key);
|
|
return MDB_SUCCESS;
|
|
}
|
|
|
|
/** Move the cursor to the previous data item. */
|
|
static int
|
|
mdb_cursor_prev(MDB_cursor *mc, MDB_val *key, MDB_val *data, MDB_cursor_op op)
|
|
{
|
|
MDB_page *mp;
|
|
MDB_node *leaf;
|
|
int rc;
|
|
|
|
assert(mc->mc_flags & C_INITIALIZED);
|
|
|
|
mp = mc->mc_pg[mc->mc_top];
|
|
|
|
if (mc->mc_db->md_flags & MDB_DUPSORT) {
|
|
leaf = NODEPTR(mp, mc->mc_ki[mc->mc_top]);
|
|
if (F_ISSET(leaf->mn_flags, F_DUPDATA)) {
|
|
if (op == MDB_PREV || op == MDB_PREV_DUP) {
|
|
rc = mdb_cursor_prev(&mc->mc_xcursor->mx_cursor, data, NULL, MDB_PREV);
|
|
if (op != MDB_PREV || rc != MDB_NOTFOUND) {
|
|
if (rc == MDB_SUCCESS)
|
|
MDB_GET_KEY(leaf, key);
|
|
return rc;
|
|
}
|
|
} else {
|
|
mc->mc_xcursor->mx_cursor.mc_flags &= ~(C_INITIALIZED|C_EOF);
|
|
if (op == MDB_PREV_DUP)
|
|
return MDB_NOTFOUND;
|
|
}
|
|
}
|
|
}
|
|
|
|
DPRINTF(("cursor_prev: top page is %"Z"u in cursor %p", mp->mp_pgno, (void *) mc));
|
|
|
|
if (mc->mc_ki[mc->mc_top] == 0) {
|
|
DPUTS("=====> move to prev sibling page");
|
|
if ((rc = mdb_cursor_sibling(mc, 0)) != MDB_SUCCESS) {
|
|
return rc;
|
|
}
|
|
mp = mc->mc_pg[mc->mc_top];
|
|
mc->mc_ki[mc->mc_top] = NUMKEYS(mp) - 1;
|
|
DPRINTF(("prev page is %"Z"u, key index %u", mp->mp_pgno, mc->mc_ki[mc->mc_top]));
|
|
} else
|
|
mc->mc_ki[mc->mc_top]--;
|
|
|
|
mc->mc_flags &= ~C_EOF;
|
|
|
|
DPRINTF(("==> cursor points to page %"Z"u with %u keys, key index %u",
|
|
mp->mp_pgno, NUMKEYS(mp), mc->mc_ki[mc->mc_top]));
|
|
|
|
if (IS_LEAF2(mp)) {
|
|
key->mv_size = mc->mc_db->md_pad;
|
|
key->mv_data = LEAF2KEY(mp, mc->mc_ki[mc->mc_top], key->mv_size);
|
|
return MDB_SUCCESS;
|
|
}
|
|
|
|
assert(IS_LEAF(mp));
|
|
leaf = NODEPTR(mp, mc->mc_ki[mc->mc_top]);
|
|
|
|
if (F_ISSET(leaf->mn_flags, F_DUPDATA)) {
|
|
mdb_xcursor_init1(mc, leaf);
|
|
}
|
|
if (data) {
|
|
if ((rc = mdb_node_read(mc->mc_txn, leaf, data)) != MDB_SUCCESS)
|
|
return rc;
|
|
|
|
if (F_ISSET(leaf->mn_flags, F_DUPDATA)) {
|
|
rc = mdb_cursor_last(&mc->mc_xcursor->mx_cursor, data, NULL);
|
|
if (rc != MDB_SUCCESS)
|
|
return rc;
|
|
}
|
|
}
|
|
|
|
MDB_GET_KEY(leaf, key);
|
|
return MDB_SUCCESS;
|
|
}
|
|
|
|
/** Set the cursor on a specific data item. */
|
|
static int
|
|
mdb_cursor_set(MDB_cursor *mc, MDB_val *key, MDB_val *data,
|
|
MDB_cursor_op op, int *exactp)
|
|
{
|
|
int rc;
|
|
MDB_page *mp;
|
|
MDB_node *leaf = NULL;
|
|
DKBUF;
|
|
|
|
assert(mc);
|
|
assert(key);
|
|
if (key->mv_size == 0)
|
|
return MDB_BAD_VALSIZE;
|
|
|
|
if (mc->mc_xcursor)
|
|
mc->mc_xcursor->mx_cursor.mc_flags &= ~(C_INITIALIZED|C_EOF);
|
|
|
|
/* See if we're already on the right page */
|
|
if (mc->mc_flags & C_INITIALIZED) {
|
|
MDB_val nodekey;
|
|
|
|
mp = mc->mc_pg[mc->mc_top];
|
|
if (!NUMKEYS(mp)) {
|
|
mc->mc_ki[mc->mc_top] = 0;
|
|
return MDB_NOTFOUND;
|
|
}
|
|
if (mp->mp_flags & P_LEAF2) {
|
|
nodekey.mv_size = mc->mc_db->md_pad;
|
|
nodekey.mv_data = LEAF2KEY(mp, 0, nodekey.mv_size);
|
|
} else {
|
|
leaf = NODEPTR(mp, 0);
|
|
MDB_GET_KEY2(leaf, nodekey);
|
|
}
|
|
rc = mc->mc_dbx->md_cmp(key, &nodekey);
|
|
if (rc == 0) {
|
|
/* Probably happens rarely, but first node on the page
|
|
* was the one we wanted.
|
|
*/
|
|
mc->mc_ki[mc->mc_top] = 0;
|
|
if (exactp)
|
|
*exactp = 1;
|
|
goto set1;
|
|
}
|
|
if (rc > 0) {
|
|
unsigned int i;
|
|
unsigned int nkeys = NUMKEYS(mp);
|
|
if (nkeys > 1) {
|
|
if (mp->mp_flags & P_LEAF2) {
|
|
nodekey.mv_data = LEAF2KEY(mp,
|
|
nkeys-1, nodekey.mv_size);
|
|
} else {
|
|
leaf = NODEPTR(mp, nkeys-1);
|
|
MDB_GET_KEY2(leaf, nodekey);
|
|
}
|
|
rc = mc->mc_dbx->md_cmp(key, &nodekey);
|
|
if (rc == 0) {
|
|
/* last node was the one we wanted */
|
|
mc->mc_ki[mc->mc_top] = nkeys-1;
|
|
if (exactp)
|
|
*exactp = 1;
|
|
goto set1;
|
|
}
|
|
if (rc < 0) {
|
|
if (mc->mc_ki[mc->mc_top] < NUMKEYS(mp)) {
|
|
/* This is definitely the right page, skip search_page */
|
|
if (mp->mp_flags & P_LEAF2) {
|
|
nodekey.mv_data = LEAF2KEY(mp,
|
|
mc->mc_ki[mc->mc_top], nodekey.mv_size);
|
|
} else {
|
|
leaf = NODEPTR(mp, mc->mc_ki[mc->mc_top]);
|
|
MDB_GET_KEY2(leaf, nodekey);
|
|
}
|
|
rc = mc->mc_dbx->md_cmp(key, &nodekey);
|
|
if (rc == 0) {
|
|
/* current node was the one we wanted */
|
|
if (exactp)
|
|
*exactp = 1;
|
|
goto set1;
|
|
}
|
|
}
|
|
rc = 0;
|
|
goto set2;
|
|
}
|
|
}
|
|
/* If any parents have right-sibs, search.
|
|
* Otherwise, there's nothing further.
|
|
*/
|
|
for (i=0; i<mc->mc_top; i++)
|
|
if (mc->mc_ki[i] <
|
|
NUMKEYS(mc->mc_pg[i])-1)
|
|
break;
|
|
if (i == mc->mc_top) {
|
|
/* There are no other pages */
|
|
mc->mc_ki[mc->mc_top] = nkeys;
|
|
return MDB_NOTFOUND;
|
|
}
|
|
}
|
|
if (!mc->mc_top) {
|
|
/* There are no other pages */
|
|
mc->mc_ki[mc->mc_top] = 0;
|
|
if (op == MDB_SET_RANGE) {
|
|
rc = 0;
|
|
goto set1;
|
|
} else
|
|
return MDB_NOTFOUND;
|
|
}
|
|
}
|
|
|
|
rc = mdb_page_search(mc, key, 0);
|
|
if (rc != MDB_SUCCESS)
|
|
return rc;
|
|
|
|
mp = mc->mc_pg[mc->mc_top];
|
|
assert(IS_LEAF(mp));
|
|
|
|
set2:
|
|
leaf = mdb_node_search(mc, key, exactp);
|
|
if (exactp != NULL && !*exactp) {
|
|
/* MDB_SET specified and not an exact match. */
|
|
return MDB_NOTFOUND;
|
|
}
|
|
|
|
if (leaf == NULL) {
|
|
DPUTS("===> inexact leaf not found, goto sibling");
|
|
if ((rc = mdb_cursor_sibling(mc, 1)) != MDB_SUCCESS)
|
|
return rc; /* no entries matched */
|
|
mp = mc->mc_pg[mc->mc_top];
|
|
assert(IS_LEAF(mp));
|
|
leaf = NODEPTR(mp, 0);
|
|
}
|
|
|
|
set1:
|
|
mc->mc_flags |= C_INITIALIZED;
|
|
mc->mc_flags &= ~C_EOF;
|
|
|
|
if (IS_LEAF2(mp)) {
|
|
key->mv_size = mc->mc_db->md_pad;
|
|
key->mv_data = LEAF2KEY(mp, mc->mc_ki[mc->mc_top], key->mv_size);
|
|
return MDB_SUCCESS;
|
|
}
|
|
|
|
if (F_ISSET(leaf->mn_flags, F_DUPDATA)) {
|
|
mdb_xcursor_init1(mc, leaf);
|
|
}
|
|
if (data) {
|
|
if (F_ISSET(leaf->mn_flags, F_DUPDATA)) {
|
|
if (op == MDB_SET || op == MDB_SET_KEY || op == MDB_SET_RANGE) {
|
|
rc = mdb_cursor_first(&mc->mc_xcursor->mx_cursor, data, NULL);
|
|
} else {
|
|
int ex2, *ex2p;
|
|
if (op == MDB_GET_BOTH) {
|
|
ex2p = &ex2;
|
|
ex2 = 0;
|
|
} else {
|
|
ex2p = NULL;
|
|
}
|
|
rc = mdb_cursor_set(&mc->mc_xcursor->mx_cursor, data, NULL, MDB_SET_RANGE, ex2p);
|
|
if (rc != MDB_SUCCESS)
|
|
return rc;
|
|
}
|
|
} else if (op == MDB_GET_BOTH || op == MDB_GET_BOTH_RANGE) {
|
|
MDB_val d2;
|
|
if ((rc = mdb_node_read(mc->mc_txn, leaf, &d2)) != MDB_SUCCESS)
|
|
return rc;
|
|
rc = mc->mc_dbx->md_dcmp(data, &d2);
|
|
if (rc) {
|
|
if (op == MDB_GET_BOTH || rc > 0)
|
|
return MDB_NOTFOUND;
|
|
rc = 0;
|
|
}
|
|
|
|
} else {
|
|
if (mc->mc_xcursor)
|
|
mc->mc_xcursor->mx_cursor.mc_flags &= ~(C_INITIALIZED|C_EOF);
|
|
if ((rc = mdb_node_read(mc->mc_txn, leaf, data)) != MDB_SUCCESS)
|
|
return rc;
|
|
}
|
|
}
|
|
|
|
/* The key already matches in all other cases */
|
|
if (op == MDB_SET_RANGE || op == MDB_SET_KEY)
|
|
MDB_GET_KEY(leaf, key);
|
|
DPRINTF(("==> cursor placed on key [%s]", DKEY(key)));
|
|
|
|
return rc;
|
|
}
|
|
|
|
/** Move the cursor to the first item in the database. */
|
|
static int
|
|
mdb_cursor_first(MDB_cursor *mc, MDB_val *key, MDB_val *data)
|
|
{
|
|
int rc;
|
|
MDB_node *leaf;
|
|
|
|
if (mc->mc_xcursor)
|
|
mc->mc_xcursor->mx_cursor.mc_flags &= ~(C_INITIALIZED|C_EOF);
|
|
|
|
if (!(mc->mc_flags & C_INITIALIZED) || mc->mc_top) {
|
|
rc = mdb_page_search(mc, NULL, MDB_PS_FIRST);
|
|
if (rc != MDB_SUCCESS)
|
|
return rc;
|
|
}
|
|
assert(IS_LEAF(mc->mc_pg[mc->mc_top]));
|
|
|
|
leaf = NODEPTR(mc->mc_pg[mc->mc_top], 0);
|
|
mc->mc_flags |= C_INITIALIZED;
|
|
mc->mc_flags &= ~C_EOF;
|
|
|
|
mc->mc_ki[mc->mc_top] = 0;
|
|
|
|
if (IS_LEAF2(mc->mc_pg[mc->mc_top])) {
|
|
key->mv_size = mc->mc_db->md_pad;
|
|
key->mv_data = LEAF2KEY(mc->mc_pg[mc->mc_top], 0, key->mv_size);
|
|
return MDB_SUCCESS;
|
|
}
|
|
|
|
if (data) {
|
|
if (F_ISSET(leaf->mn_flags, F_DUPDATA)) {
|
|
mdb_xcursor_init1(mc, leaf);
|
|
rc = mdb_cursor_first(&mc->mc_xcursor->mx_cursor, data, NULL);
|
|
if (rc)
|
|
return rc;
|
|
} else {
|
|
if ((rc = mdb_node_read(mc->mc_txn, leaf, data)) != MDB_SUCCESS)
|
|
return rc;
|
|
}
|
|
}
|
|
MDB_GET_KEY(leaf, key);
|
|
return MDB_SUCCESS;
|
|
}
|
|
|
|
/** Move the cursor to the last item in the database. */
|
|
static int
|
|
mdb_cursor_last(MDB_cursor *mc, MDB_val *key, MDB_val *data)
|
|
{
|
|
int rc;
|
|
MDB_node *leaf;
|
|
|
|
if (mc->mc_xcursor)
|
|
mc->mc_xcursor->mx_cursor.mc_flags &= ~(C_INITIALIZED|C_EOF);
|
|
|
|
if (!(mc->mc_flags & C_EOF)) {
|
|
|
|
if (!(mc->mc_flags & C_INITIALIZED) || mc->mc_top) {
|
|
rc = mdb_page_search(mc, NULL, MDB_PS_LAST);
|
|
if (rc != MDB_SUCCESS)
|
|
return rc;
|
|
}
|
|
assert(IS_LEAF(mc->mc_pg[mc->mc_top]));
|
|
|
|
}
|
|
mc->mc_ki[mc->mc_top] = NUMKEYS(mc->mc_pg[mc->mc_top]) - 1;
|
|
mc->mc_flags |= C_INITIALIZED|C_EOF;
|
|
leaf = NODEPTR(mc->mc_pg[mc->mc_top], mc->mc_ki[mc->mc_top]);
|
|
|
|
if (IS_LEAF2(mc->mc_pg[mc->mc_top])) {
|
|
key->mv_size = mc->mc_db->md_pad;
|
|
key->mv_data = LEAF2KEY(mc->mc_pg[mc->mc_top], mc->mc_ki[mc->mc_top], key->mv_size);
|
|
return MDB_SUCCESS;
|
|
}
|
|
|
|
if (data) {
|
|
if (F_ISSET(leaf->mn_flags, F_DUPDATA)) {
|
|
mdb_xcursor_init1(mc, leaf);
|
|
rc = mdb_cursor_last(&mc->mc_xcursor->mx_cursor, data, NULL);
|
|
if (rc)
|
|
return rc;
|
|
} else {
|
|
if ((rc = mdb_node_read(mc->mc_txn, leaf, data)) != MDB_SUCCESS)
|
|
return rc;
|
|
}
|
|
}
|
|
|
|
MDB_GET_KEY(leaf, key);
|
|
return MDB_SUCCESS;
|
|
}
|
|
|
|
int
|
|
mdb_cursor_get(MDB_cursor *mc, MDB_val *key, MDB_val *data,
|
|
MDB_cursor_op op)
|
|
{
|
|
int rc;
|
|
int exact = 0;
|
|
int (*mfunc)(MDB_cursor *mc, MDB_val *key, MDB_val *data);
|
|
|
|
assert(mc);
|
|
|
|
if (mc->mc_txn->mt_flags & MDB_TXN_ERROR)
|
|
return MDB_BAD_TXN;
|
|
|
|
switch (op) {
|
|
case MDB_GET_CURRENT:
|
|
if (!(mc->mc_flags & C_INITIALIZED)) {
|
|
rc = EINVAL;
|
|
} else {
|
|
MDB_page *mp = mc->mc_pg[mc->mc_top];
|
|
if (!NUMKEYS(mp)) {
|
|
mc->mc_ki[mc->mc_top] = 0;
|
|
rc = MDB_NOTFOUND;
|
|
break;
|
|
}
|
|
rc = MDB_SUCCESS;
|
|
if (IS_LEAF2(mp)) {
|
|
key->mv_size = mc->mc_db->md_pad;
|
|
key->mv_data = LEAF2KEY(mp, mc->mc_ki[mc->mc_top], key->mv_size);
|
|
} else {
|
|
MDB_node *leaf = NODEPTR(mp, mc->mc_ki[mc->mc_top]);
|
|
MDB_GET_KEY(leaf, key);
|
|
if (data) {
|
|
if (F_ISSET(leaf->mn_flags, F_DUPDATA)) {
|
|
if (mc->mc_flags & C_DEL)
|
|
mdb_xcursor_init1(mc, leaf);
|
|
rc = mdb_cursor_get(&mc->mc_xcursor->mx_cursor, data, NULL, MDB_GET_CURRENT);
|
|
} else {
|
|
rc = mdb_node_read(mc->mc_txn, leaf, data);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
break;
|
|
case MDB_GET_BOTH:
|
|
case MDB_GET_BOTH_RANGE:
|
|
if (data == NULL) {
|
|
rc = EINVAL;
|
|
break;
|
|
}
|
|
if (mc->mc_xcursor == NULL) {
|
|
rc = MDB_INCOMPATIBLE;
|
|
break;
|
|
}
|
|
/* FALLTHRU */
|
|
case MDB_SET:
|
|
case MDB_SET_KEY:
|
|
case MDB_SET_RANGE:
|
|
if (key == NULL) {
|
|
rc = EINVAL;
|
|
} else if (key->mv_size > MDB_MAXKEYSIZE) {
|
|
rc = MDB_BAD_VALSIZE;
|
|
} else if (op == MDB_SET_RANGE)
|
|
rc = mdb_cursor_set(mc, key, data, op, NULL);
|
|
else
|
|
rc = mdb_cursor_set(mc, key, data, op, &exact);
|
|
break;
|
|
case MDB_GET_MULTIPLE:
|
|
if (data == NULL || !(mc->mc_flags & C_INITIALIZED)) {
|
|
rc = EINVAL;
|
|
break;
|
|
}
|
|
if (!(mc->mc_db->md_flags & MDB_DUPFIXED)) {
|
|
rc = MDB_INCOMPATIBLE;
|
|
break;
|
|
}
|
|
rc = MDB_SUCCESS;
|
|
if (!(mc->mc_xcursor->mx_cursor.mc_flags & C_INITIALIZED) ||
|
|
(mc->mc_xcursor->mx_cursor.mc_flags & C_EOF))
|
|
break;
|
|
goto fetchm;
|
|
case MDB_NEXT_MULTIPLE:
|
|
if (data == NULL) {
|
|
rc = EINVAL;
|
|
break;
|
|
}
|
|
if (!(mc->mc_db->md_flags & MDB_DUPFIXED)) {
|
|
rc = MDB_INCOMPATIBLE;
|
|
break;
|
|
}
|
|
if (!(mc->mc_flags & C_INITIALIZED))
|
|
rc = mdb_cursor_first(mc, key, data);
|
|
else
|
|
rc = mdb_cursor_next(mc, key, data, MDB_NEXT_DUP);
|
|
if (rc == MDB_SUCCESS) {
|
|
if (mc->mc_xcursor->mx_cursor.mc_flags & C_INITIALIZED) {
|
|
MDB_cursor *mx;
|
|
fetchm:
|
|
mx = &mc->mc_xcursor->mx_cursor;
|
|
data->mv_size = NUMKEYS(mx->mc_pg[mx->mc_top]) *
|
|
mx->mc_db->md_pad;
|
|
data->mv_data = METADATA(mx->mc_pg[mx->mc_top]);
|
|
mx->mc_ki[mx->mc_top] = NUMKEYS(mx->mc_pg[mx->mc_top])-1;
|
|
} else {
|
|
rc = MDB_NOTFOUND;
|
|
}
|
|
}
|
|
break;
|
|
case MDB_NEXT:
|
|
case MDB_NEXT_DUP:
|
|
case MDB_NEXT_NODUP:
|
|
if (!(mc->mc_flags & C_INITIALIZED))
|
|
rc = mdb_cursor_first(mc, key, data);
|
|
else
|
|
rc = mdb_cursor_next(mc, key, data, op);
|
|
break;
|
|
case MDB_PREV:
|
|
case MDB_PREV_DUP:
|
|
case MDB_PREV_NODUP:
|
|
if (!(mc->mc_flags & C_INITIALIZED)) {
|
|
rc = mdb_cursor_last(mc, key, data);
|
|
if (rc)
|
|
break;
|
|
mc->mc_flags |= C_INITIALIZED;
|
|
mc->mc_ki[mc->mc_top]++;
|
|
}
|
|
rc = mdb_cursor_prev(mc, key, data, op);
|
|
break;
|
|
case MDB_FIRST:
|
|
rc = mdb_cursor_first(mc, key, data);
|
|
break;
|
|
case MDB_FIRST_DUP:
|
|
mfunc = mdb_cursor_first;
|
|
mmove:
|
|
if (data == NULL || !(mc->mc_flags & C_INITIALIZED)) {
|
|
rc = EINVAL;
|
|
break;
|
|
}
|
|
if (mc->mc_xcursor == NULL) {
|
|
rc = MDB_INCOMPATIBLE;
|
|
break;
|
|
}
|
|
if (!(mc->mc_xcursor->mx_cursor.mc_flags & C_INITIALIZED)) {
|
|
rc = EINVAL;
|
|
break;
|
|
}
|
|
rc = mfunc(&mc->mc_xcursor->mx_cursor, data, NULL);
|
|
break;
|
|
case MDB_LAST:
|
|
rc = mdb_cursor_last(mc, key, data);
|
|
break;
|
|
case MDB_LAST_DUP:
|
|
mfunc = mdb_cursor_last;
|
|
goto mmove;
|
|
default:
|
|
DPRINTF(("unhandled/unimplemented cursor operation %u", op));
|
|
rc = EINVAL;
|
|
break;
|
|
}
|
|
|
|
if (mc->mc_flags & C_DEL)
|
|
mc->mc_flags ^= C_DEL;
|
|
|
|
return rc;
|
|
}
|
|
|
|
/** Touch all the pages in the cursor stack.
|
|
* Makes sure all the pages are writable, before attempting a write operation.
|
|
* @param[in] mc The cursor to operate on.
|
|
*/
|
|
static int
|
|
mdb_cursor_touch(MDB_cursor *mc)
|
|
{
|
|
int rc;
|
|
|
|
if (mc->mc_dbi > MAIN_DBI && !(*mc->mc_dbflag & DB_DIRTY)) {
|
|
MDB_cursor mc2;
|
|
MDB_xcursor mcx;
|
|
mdb_cursor_init(&mc2, mc->mc_txn, MAIN_DBI, &mcx);
|
|
rc = mdb_page_search(&mc2, &mc->mc_dbx->md_name, MDB_PS_MODIFY);
|
|
if (rc)
|
|
return rc;
|
|
*mc->mc_dbflag |= DB_DIRTY;
|
|
}
|
|
for (mc->mc_top = 0; mc->mc_top < mc->mc_snum; mc->mc_top++) {
|
|
rc = mdb_page_touch(mc);
|
|
if (rc)
|
|
return rc;
|
|
}
|
|
mc->mc_top = mc->mc_snum-1;
|
|
return MDB_SUCCESS;
|
|
}
|
|
|
|
/** Do not spill pages to disk if txn is getting full, may fail instead */
|
|
#define MDB_NOSPILL 0x8000
|
|
|
|
int
|
|
mdb_cursor_put(MDB_cursor *mc, MDB_val *key, MDB_val *data,
|
|
unsigned int flags)
|
|
{
|
|
enum { MDB_NO_ROOT = MDB_LAST_ERRCODE+10 }; /* internal code */
|
|
MDB_node *leaf = NULL;
|
|
MDB_val xdata, *rdata, dkey;
|
|
MDB_page *fp;
|
|
MDB_db dummy;
|
|
int do_sub = 0, insert = 0;
|
|
unsigned int mcount = 0, dcount = 0, nospill;
|
|
size_t nsize;
|
|
int rc, rc2;
|
|
MDB_pagebuf pbuf;
|
|
char dbuf[MDB_MAXKEYSIZE+1];
|
|
unsigned int nflags;
|
|
DKBUF;
|
|
|
|
/* Check this first so counter will always be zero on any
|
|
* early failures.
|
|
*/
|
|
if (flags & MDB_MULTIPLE) {
|
|
dcount = data[1].mv_size;
|
|
data[1].mv_size = 0;
|
|
if (!F_ISSET(mc->mc_db->md_flags, MDB_DUPFIXED))
|
|
return MDB_INCOMPATIBLE;
|
|
}
|
|
|
|
nospill = flags & MDB_NOSPILL;
|
|
flags &= ~MDB_NOSPILL;
|
|
|
|
if (mc->mc_txn->mt_flags & (MDB_TXN_RDONLY|MDB_TXN_ERROR))
|
|
return (mc->mc_txn->mt_flags & MDB_TXN_RDONLY) ? EACCES : MDB_BAD_TXN;
|
|
|
|
if (flags != MDB_CURRENT && (key->mv_size == 0 || key->mv_size > MDB_MAXKEYSIZE))
|
|
return MDB_BAD_VALSIZE;
|
|
|
|
if (F_ISSET(mc->mc_db->md_flags, MDB_DUPSORT) && data->mv_size > MDB_MAXKEYSIZE)
|
|
return MDB_BAD_VALSIZE;
|
|
|
|
#if SIZE_MAX > MAXDATASIZE
|
|
if (data->mv_size > MAXDATASIZE)
|
|
return MDB_BAD_VALSIZE;
|
|
#endif
|
|
|
|
DPRINTF(("==> put db %d key [%s], size %"Z"u, data size %"Z"u",
|
|
DDBI(mc), DKEY(key), key ? key->mv_size : 0, data->mv_size));
|
|
|
|
dkey.mv_size = 0;
|
|
|
|
if (flags == MDB_CURRENT) {
|
|
if (!(mc->mc_flags & C_INITIALIZED))
|
|
return EINVAL;
|
|
rc = MDB_SUCCESS;
|
|
} else if (mc->mc_db->md_root == P_INVALID) {
|
|
/* new database, cursor has nothing to point to */
|
|
mc->mc_snum = 0;
|
|
mc->mc_flags &= ~C_INITIALIZED;
|
|
rc = MDB_NO_ROOT;
|
|
} else {
|
|
int exact = 0;
|
|
MDB_val d2;
|
|
if (flags & MDB_APPEND) {
|
|
MDB_val k2;
|
|
rc = mdb_cursor_last(mc, &k2, &d2);
|
|
if (rc == 0) {
|
|
rc = mc->mc_dbx->md_cmp(key, &k2);
|
|
if (rc > 0) {
|
|
rc = MDB_NOTFOUND;
|
|
mc->mc_ki[mc->mc_top]++;
|
|
} else {
|
|
/* new key is <= last key */
|
|
rc = MDB_KEYEXIST;
|
|
}
|
|
}
|
|
} else {
|
|
rc = mdb_cursor_set(mc, key, &d2, MDB_SET, &exact);
|
|
}
|
|
if ((flags & MDB_NOOVERWRITE) && rc == 0) {
|
|
DPRINTF(("duplicate key [%s]", DKEY(key)));
|
|
*data = d2;
|
|
return MDB_KEYEXIST;
|
|
}
|
|
if (rc && rc != MDB_NOTFOUND)
|
|
return rc;
|
|
}
|
|
|
|
if (mc->mc_flags & C_DEL)
|
|
mc->mc_flags ^= C_DEL;
|
|
|
|
/* Cursor is positioned, check for room in the dirty list */
|
|
if (!nospill) {
|
|
if (flags & MDB_MULTIPLE) {
|
|
rdata = &xdata;
|
|
xdata.mv_size = data->mv_size * dcount;
|
|
} else {
|
|
rdata = data;
|
|
}
|
|
if ((rc2 = mdb_page_spill(mc, key, rdata)))
|
|
return rc2;
|
|
}
|
|
|
|
if (rc == MDB_NO_ROOT) {
|
|
MDB_page *np;
|
|
/* new database, write a root leaf page */
|
|
DPUTS("allocating new root leaf page");
|
|
if ((rc2 = mdb_page_new(mc, P_LEAF, 1, &np))) {
|
|
return rc2;
|
|
}
|
|
mdb_cursor_push(mc, np);
|
|
mc->mc_db->md_root = np->mp_pgno;
|
|
mc->mc_db->md_depth++;
|
|
*mc->mc_dbflag |= DB_DIRTY;
|
|
if ((mc->mc_db->md_flags & (MDB_DUPSORT|MDB_DUPFIXED))
|
|
== MDB_DUPFIXED)
|
|
np->mp_flags |= P_LEAF2;
|
|
mc->mc_flags |= C_INITIALIZED;
|
|
} else {
|
|
/* make sure all cursor pages are writable */
|
|
rc2 = mdb_cursor_touch(mc);
|
|
if (rc2)
|
|
return rc2;
|
|
}
|
|
|
|
/* The key already exists */
|
|
if (rc == MDB_SUCCESS) {
|
|
/* there's only a key anyway, so this is a no-op */
|
|
if (IS_LEAF2(mc->mc_pg[mc->mc_top])) {
|
|
unsigned int ksize = mc->mc_db->md_pad;
|
|
if (key->mv_size != ksize)
|
|
return MDB_BAD_VALSIZE;
|
|
if (flags == MDB_CURRENT) {
|
|
char *ptr = LEAF2KEY(mc->mc_pg[mc->mc_top], mc->mc_ki[mc->mc_top], ksize);
|
|
memcpy(ptr, key->mv_data, ksize);
|
|
}
|
|
return MDB_SUCCESS;
|
|
}
|
|
|
|
leaf = NODEPTR(mc->mc_pg[mc->mc_top], mc->mc_ki[mc->mc_top]);
|
|
|
|
/* DB has dups? */
|
|
if (F_ISSET(mc->mc_db->md_flags, MDB_DUPSORT)) {
|
|
/* Was a single item before, must convert now */
|
|
more:
|
|
if (!F_ISSET(leaf->mn_flags, F_DUPDATA)) {
|
|
/* Just overwrite the current item */
|
|
if (flags == MDB_CURRENT)
|
|
goto current;
|
|
|
|
dkey.mv_size = NODEDSZ(leaf);
|
|
dkey.mv_data = NODEDATA(leaf);
|
|
#if UINT_MAX < SIZE_MAX
|
|
if (mc->mc_dbx->md_dcmp == mdb_cmp_int && dkey.mv_size == sizeof(size_t))
|
|
#ifdef MISALIGNED_OK
|
|
mc->mc_dbx->md_dcmp = mdb_cmp_long;
|
|
#else
|
|
mc->mc_dbx->md_dcmp = mdb_cmp_cint;
|
|
#endif
|
|
#endif
|
|
/* if data matches, skip it */
|
|
if (!mc->mc_dbx->md_dcmp(data, &dkey)) {
|
|
if (flags & MDB_NODUPDATA)
|
|
rc = MDB_KEYEXIST;
|
|
else if (flags & MDB_MULTIPLE)
|
|
goto next_mult;
|
|
else
|
|
rc = MDB_SUCCESS;
|
|
return rc;
|
|
}
|
|
|
|
/* create a fake page for the dup items */
|
|
memcpy(dbuf, dkey.mv_data, dkey.mv_size);
|
|
dkey.mv_data = dbuf;
|
|
fp = (MDB_page *)&pbuf;
|
|
fp->mp_pgno = mc->mc_pg[mc->mc_top]->mp_pgno;
|
|
fp->mp_flags = P_LEAF|P_DIRTY|P_SUBP;
|
|
fp->mp_lower = PAGEHDRSZ;
|
|
fp->mp_upper = PAGEHDRSZ + dkey.mv_size + data->mv_size;
|
|
if (mc->mc_db->md_flags & MDB_DUPFIXED) {
|
|
fp->mp_flags |= P_LEAF2;
|
|
fp->mp_pad = data->mv_size;
|
|
fp->mp_upper += 2 * data->mv_size; /* leave space for 2 more */
|
|
} else {
|
|
fp->mp_upper += 2 * sizeof(indx_t) + 2 * NODESIZE +
|
|
(dkey.mv_size & 1) + (data->mv_size & 1);
|
|
}
|
|
mdb_node_del(mc->mc_pg[mc->mc_top], mc->mc_ki[mc->mc_top], 0);
|
|
do_sub = 1;
|
|
rdata = &xdata;
|
|
xdata.mv_size = fp->mp_upper;
|
|
xdata.mv_data = fp;
|
|
flags |= F_DUPDATA;
|
|
goto new_sub;
|
|
}
|
|
if (!F_ISSET(leaf->mn_flags, F_SUBDATA)) {
|
|
/* See if we need to convert from fake page to subDB */
|
|
MDB_page *mp;
|
|
unsigned int offset;
|
|
unsigned int i;
|
|
uint16_t fp_flags;
|
|
|
|
fp = NODEDATA(leaf);
|
|
if (flags == MDB_CURRENT) {
|
|
reuse:
|
|
fp->mp_flags |= P_DIRTY;
|
|
COPY_PGNO(fp->mp_pgno, mc->mc_pg[mc->mc_top]->mp_pgno);
|
|
mc->mc_xcursor->mx_cursor.mc_pg[0] = fp;
|
|
flags |= F_DUPDATA;
|
|
goto put_sub;
|
|
}
|
|
if (mc->mc_db->md_flags & MDB_DUPFIXED) {
|
|
offset = fp->mp_pad;
|
|
if (SIZELEFT(fp) >= offset)
|
|
goto reuse;
|
|
offset *= 4; /* space for 4 more */
|
|
} else {
|
|
offset = NODESIZE + sizeof(indx_t) + data->mv_size;
|
|
}
|
|
offset += offset & 1;
|
|
fp_flags = fp->mp_flags;
|
|
if (NODESIZE + sizeof(indx_t) + NODEKSZ(leaf) + NODEDSZ(leaf) +
|
|
offset >= mc->mc_txn->mt_env->me_nodemax) {
|
|
/* yes, convert it */
|
|
dummy.md_flags = 0;
|
|
if (mc->mc_db->md_flags & MDB_DUPFIXED) {
|
|
dummy.md_pad = fp->mp_pad;
|
|
dummy.md_flags = MDB_DUPFIXED;
|
|
if (mc->mc_db->md_flags & MDB_INTEGERDUP)
|
|
dummy.md_flags |= MDB_INTEGERKEY;
|
|
}
|
|
dummy.md_depth = 1;
|
|
dummy.md_branch_pages = 0;
|
|
dummy.md_leaf_pages = 1;
|
|
dummy.md_overflow_pages = 0;
|
|
dummy.md_entries = NUMKEYS(fp);
|
|
rdata = &xdata;
|
|
xdata.mv_size = sizeof(MDB_db);
|
|
xdata.mv_data = &dummy;
|
|
if ((rc = mdb_page_alloc(mc, 1, &mp)))
|
|
return rc;
|
|
offset = mc->mc_txn->mt_env->me_psize - NODEDSZ(leaf);
|
|
flags |= F_DUPDATA|F_SUBDATA;
|
|
dummy.md_root = mp->mp_pgno;
|
|
fp_flags &= ~P_SUBP;
|
|
} else {
|
|
/* no, just grow it */
|
|
rdata = &xdata;
|
|
xdata.mv_size = NODEDSZ(leaf) + offset;
|
|
xdata.mv_data = &pbuf;
|
|
mp = (MDB_page *)&pbuf;
|
|
mp->mp_pgno = mc->mc_pg[mc->mc_top]->mp_pgno;
|
|
flags |= F_DUPDATA;
|
|
}
|
|
mp->mp_flags = fp_flags | P_DIRTY;
|
|
mp->mp_pad = fp->mp_pad;
|
|
mp->mp_lower = fp->mp_lower;
|
|
mp->mp_upper = fp->mp_upper + offset;
|
|
if (IS_LEAF2(fp)) {
|
|
memcpy(METADATA(mp), METADATA(fp), NUMKEYS(fp) * fp->mp_pad);
|
|
} else {
|
|
nsize = NODEDSZ(leaf) - fp->mp_upper;
|
|
memcpy((char *)mp + mp->mp_upper, (char *)fp + fp->mp_upper, nsize);
|
|
for (i=0; i<NUMKEYS(fp); i++)
|
|
mp->mp_ptrs[i] = fp->mp_ptrs[i] + offset;
|
|
}
|
|
mdb_node_del(mc->mc_pg[mc->mc_top], mc->mc_ki[mc->mc_top], 0);
|
|
do_sub = 1;
|
|
goto new_sub;
|
|
}
|
|
/* data is on sub-DB, just store it */
|
|
flags |= F_DUPDATA|F_SUBDATA;
|
|
goto put_sub;
|
|
}
|
|
current:
|
|
/* overflow page overwrites need special handling */
|
|
if (F_ISSET(leaf->mn_flags, F_BIGDATA)) {
|
|
MDB_page *omp;
|
|
pgno_t pg;
|
|
unsigned psize = mc->mc_txn->mt_env->me_psize;
|
|
int level, ovpages, dpages = OVPAGES(data->mv_size, psize);
|
|
|
|
memcpy(&pg, NODEDATA(leaf), sizeof(pg));
|
|
if ((rc2 = mdb_page_get(mc->mc_txn, pg, &omp, &level)) != 0)
|
|
return rc2;
|
|
ovpages = omp->mp_pages;
|
|
|
|
/* Is the ov page large enough? */
|
|
if (ovpages >= dpages) {
|
|
if (!(omp->mp_flags & P_DIRTY) &&
|
|
(level || (mc->mc_txn->mt_env->me_flags & MDB_WRITEMAP)))
|
|
{
|
|
rc = mdb_page_unspill(mc->mc_txn, omp, &omp);
|
|
if (rc)
|
|
return rc;
|
|
level = 0; /* dirty in this txn or clean */
|
|
}
|
|
/* Is it dirty? */
|
|
if (omp->mp_flags & P_DIRTY) {
|
|
/* yes, overwrite it. Note in this case we don't
|
|
* bother to try shrinking the page if the new data
|
|
* is smaller than the overflow threshold.
|
|
*/
|
|
if (level > 1) {
|
|
/* It is writable only in a parent txn */
|
|
size_t sz = (size_t) psize * ovpages, off;
|
|
MDB_page *np = mdb_page_malloc(mc->mc_txn, ovpages);
|
|
MDB_ID2 id2;
|
|
if (!np)
|
|
return ENOMEM;
|
|
id2.mid = pg;
|
|
id2.mptr = np;
|
|
mdb_mid2l_insert(mc->mc_txn->mt_u.dirty_list, &id2);
|
|
if (!(flags & MDB_RESERVE)) {
|
|
/* Copy end of page, adjusting alignment so
|
|
* compiler may copy words instead of bytes.
|
|
*/
|
|
off = (PAGEHDRSZ + data->mv_size) & -sizeof(size_t);
|
|
memcpy((size_t *)((char *)np + off),
|
|
(size_t *)((char *)omp + off), sz - off);
|
|
sz = PAGEHDRSZ;
|
|
}
|
|
memcpy(np, omp, sz); /* Copy beginning of page */
|
|
omp = np;
|
|
}
|
|
SETDSZ(leaf, data->mv_size);
|
|
if (F_ISSET(flags, MDB_RESERVE))
|
|
data->mv_data = METADATA(omp);
|
|
else
|
|
memcpy(METADATA(omp), data->mv_data, data->mv_size);
|
|
goto done;
|
|
}
|
|
}
|
|
if ((rc2 = mdb_ovpage_free(mc, omp)) != MDB_SUCCESS)
|
|
return rc2;
|
|
} else if (NODEDSZ(leaf) == data->mv_size) {
|
|
/* same size, just replace it. Note that we could
|
|
* also reuse this node if the new data is smaller,
|
|
* but instead we opt to shrink the node in that case.
|
|
*/
|
|
if (F_ISSET(flags, MDB_RESERVE))
|
|
data->mv_data = NODEDATA(leaf);
|
|
else if (data->mv_size)
|
|
memcpy(NODEDATA(leaf), data->mv_data, data->mv_size);
|
|
else
|
|
memcpy(NODEKEY(leaf), key->mv_data, key->mv_size);
|
|
goto done;
|
|
}
|
|
mdb_node_del(mc->mc_pg[mc->mc_top], mc->mc_ki[mc->mc_top], 0);
|
|
mc->mc_db->md_entries--;
|
|
} else {
|
|
DPRINTF(("inserting key at index %i", mc->mc_ki[mc->mc_top]));
|
|
insert = 1;
|
|
}
|
|
|
|
rdata = data;
|
|
|
|
new_sub:
|
|
nflags = flags & NODE_ADD_FLAGS;
|
|
nsize = IS_LEAF2(mc->mc_pg[mc->mc_top]) ? key->mv_size : mdb_leaf_size(mc->mc_txn->mt_env, key, rdata);
|
|
if (SIZELEFT(mc->mc_pg[mc->mc_top]) < nsize) {
|
|
if (( flags & (F_DUPDATA|F_SUBDATA)) == F_DUPDATA )
|
|
nflags &= ~MDB_APPEND;
|
|
if (!insert)
|
|
nflags |= MDB_SPLIT_REPLACE;
|
|
rc = mdb_page_split(mc, key, rdata, P_INVALID, nflags);
|
|
} else {
|
|
/* There is room already in this leaf page. */
|
|
rc = mdb_node_add(mc, mc->mc_ki[mc->mc_top], key, rdata, 0, nflags);
|
|
if (rc == 0 && !do_sub && insert) {
|
|
/* Adjust other cursors pointing to mp */
|
|
MDB_cursor *m2, *m3;
|
|
MDB_dbi dbi = mc->mc_dbi;
|
|
unsigned i = mc->mc_top;
|
|
MDB_page *mp = mc->mc_pg[i];
|
|
|
|
for (m2 = mc->mc_txn->mt_cursors[dbi]; m2; m2=m2->mc_next) {
|
|
if (mc->mc_flags & C_SUB)
|
|
m3 = &m2->mc_xcursor->mx_cursor;
|
|
else
|
|
m3 = m2;
|
|
if (m3 == mc || m3->mc_snum < mc->mc_snum) continue;
|
|
if (m3->mc_pg[i] == mp && m3->mc_ki[i] >= mc->mc_ki[i]) {
|
|
m3->mc_ki[i]++;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
if (rc != MDB_SUCCESS)
|
|
mc->mc_txn->mt_flags |= MDB_TXN_ERROR;
|
|
else {
|
|
/* Now store the actual data in the child DB. Note that we're
|
|
* storing the user data in the keys field, so there are strict
|
|
* size limits on dupdata. The actual data fields of the child
|
|
* DB are all zero size.
|
|
*/
|
|
if (do_sub) {
|
|
int xflags;
|
|
put_sub:
|
|
xdata.mv_size = 0;
|
|
xdata.mv_data = "";
|
|
leaf = NODEPTR(mc->mc_pg[mc->mc_top], mc->mc_ki[mc->mc_top]);
|
|
if (flags & MDB_CURRENT) {
|
|
xflags = MDB_CURRENT|MDB_NOSPILL;
|
|
} else {
|
|
mdb_xcursor_init1(mc, leaf);
|
|
xflags = (flags & MDB_NODUPDATA) ?
|
|
MDB_NOOVERWRITE|MDB_NOSPILL : MDB_NOSPILL;
|
|
}
|
|
/* converted, write the original data first */
|
|
if (dkey.mv_size) {
|
|
rc = mdb_cursor_put(&mc->mc_xcursor->mx_cursor, &dkey, &xdata, xflags);
|
|
if (rc)
|
|
return rc;
|
|
{
|
|
/* Adjust other cursors pointing to mp */
|
|
MDB_cursor *m2;
|
|
unsigned i = mc->mc_top;
|
|
MDB_page *mp = mc->mc_pg[i];
|
|
|
|
for (m2 = mc->mc_txn->mt_cursors[mc->mc_dbi]; m2; m2=m2->mc_next) {
|
|
if (m2 == mc || m2->mc_snum < mc->mc_snum) continue;
|
|
if (!(m2->mc_flags & C_INITIALIZED)) continue;
|
|
if (m2->mc_pg[i] == mp && m2->mc_ki[i] == mc->mc_ki[i]) {
|
|
mdb_xcursor_init1(m2, leaf);
|
|
}
|
|
}
|
|
}
|
|
/* we've done our job */
|
|
dkey.mv_size = 0;
|
|
}
|
|
if (flags & MDB_APPENDDUP)
|
|
xflags |= MDB_APPEND;
|
|
rc = mdb_cursor_put(&mc->mc_xcursor->mx_cursor, data, &xdata, xflags);
|
|
if (flags & F_SUBDATA) {
|
|
void *db = NODEDATA(leaf);
|
|
memcpy(db, &mc->mc_xcursor->mx_db, sizeof(MDB_db));
|
|
}
|
|
}
|
|
/* sub-writes might have failed so check rc again.
|
|
* Don't increment count if we just replaced an existing item.
|
|
*/
|
|
if (!rc && !(flags & MDB_CURRENT))
|
|
mc->mc_db->md_entries++;
|
|
if (flags & MDB_MULTIPLE) {
|
|
if (!rc) {
|
|
next_mult:
|
|
mcount++;
|
|
/* let caller know how many succeeded, if any */
|
|
data[1].mv_size = mcount;
|
|
if (mcount < dcount) {
|
|
data[0].mv_data = (char *)data[0].mv_data + data[0].mv_size;
|
|
leaf = NODEPTR(mc->mc_pg[mc->mc_top], mc->mc_ki[mc->mc_top]);
|
|
goto more;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
done:
|
|
/* If we succeeded and the key didn't exist before, make sure
|
|
* the cursor is marked valid.
|
|
*/
|
|
if (!rc && insert)
|
|
mc->mc_flags |= C_INITIALIZED;
|
|
return rc;
|
|
}
|
|
|
|
int
|
|
mdb_cursor_del(MDB_cursor *mc, unsigned int flags)
|
|
{
|
|
MDB_node *leaf;
|
|
int rc;
|
|
|
|
if (mc->mc_txn->mt_flags & (MDB_TXN_RDONLY|MDB_TXN_ERROR))
|
|
return (mc->mc_txn->mt_flags & MDB_TXN_RDONLY) ? EACCES : MDB_BAD_TXN;
|
|
|
|
if (!(mc->mc_flags & C_INITIALIZED))
|
|
return EINVAL;
|
|
|
|
if (!(flags & MDB_NOSPILL) && (rc = mdb_page_spill(mc, NULL, NULL)))
|
|
return rc;
|
|
|
|
rc = mdb_cursor_touch(mc);
|
|
if (rc)
|
|
return rc;
|
|
|
|
leaf = NODEPTR(mc->mc_pg[mc->mc_top], mc->mc_ki[mc->mc_top]);
|
|
|
|
if (!IS_LEAF2(mc->mc_pg[mc->mc_top]) && F_ISSET(leaf->mn_flags, F_DUPDATA)) {
|
|
if (!(flags & MDB_NODUPDATA)) {
|
|
if (!F_ISSET(leaf->mn_flags, F_SUBDATA)) {
|
|
mc->mc_xcursor->mx_cursor.mc_pg[0] = NODEDATA(leaf);
|
|
}
|
|
rc = mdb_cursor_del(&mc->mc_xcursor->mx_cursor, MDB_NOSPILL);
|
|
/* If sub-DB still has entries, we're done */
|
|
if (mc->mc_xcursor->mx_db.md_entries) {
|
|
if (leaf->mn_flags & F_SUBDATA) {
|
|
/* update subDB info */
|
|
void *db = NODEDATA(leaf);
|
|
memcpy(db, &mc->mc_xcursor->mx_db, sizeof(MDB_db));
|
|
} else {
|
|
MDB_cursor *m2;
|
|
/* shrink fake page */
|
|
mdb_node_shrink(mc->mc_pg[mc->mc_top], mc->mc_ki[mc->mc_top]);
|
|
leaf = NODEPTR(mc->mc_pg[mc->mc_top], mc->mc_ki[mc->mc_top]);
|
|
mc->mc_xcursor->mx_cursor.mc_pg[0] = NODEDATA(leaf);
|
|
/* fix other sub-DB cursors pointed at this fake page */
|
|
for (m2 = mc->mc_txn->mt_cursors[mc->mc_dbi]; m2; m2=m2->mc_next) {
|
|
if (m2 == mc || m2->mc_snum < mc->mc_snum) continue;
|
|
if (m2->mc_pg[mc->mc_top] == mc->mc_pg[mc->mc_top] &&
|
|
m2->mc_ki[mc->mc_top] == mc->mc_ki[mc->mc_top])
|
|
m2->mc_xcursor->mx_cursor.mc_pg[0] = NODEDATA(leaf);
|
|
}
|
|
}
|
|
mc->mc_db->md_entries--;
|
|
mc->mc_flags |= C_DEL;
|
|
return rc;
|
|
}
|
|
/* otherwise fall thru and delete the sub-DB */
|
|
}
|
|
|
|
if (leaf->mn_flags & F_SUBDATA) {
|
|
/* add all the child DB's pages to the free list */
|
|
rc = mdb_drop0(&mc->mc_xcursor->mx_cursor, 0);
|
|
if (rc == MDB_SUCCESS) {
|
|
mc->mc_db->md_entries -=
|
|
mc->mc_xcursor->mx_db.md_entries;
|
|
}
|
|
}
|
|
}
|
|
|
|
return mdb_cursor_del0(mc, leaf);
|
|
}
|
|
|
|
/** Allocate and initialize new pages for a database.
|
|
* @param[in] mc a cursor on the database being added to.
|
|
* @param[in] flags flags defining what type of page is being allocated.
|
|
* @param[in] num the number of pages to allocate. This is usually 1,
|
|
* unless allocating overflow pages for a large record.
|
|
* @param[out] mp Address of a page, or NULL on failure.
|
|
* @return 0 on success, non-zero on failure.
|
|
*/
|
|
static int
|
|
mdb_page_new(MDB_cursor *mc, uint32_t flags, int num, MDB_page **mp)
|
|
{
|
|
MDB_page *np;
|
|
int rc;
|
|
|
|
if ((rc = mdb_page_alloc(mc, num, &np)))
|
|
return rc;
|
|
DPRINTF(("allocated new mpage %"Z"u, page size %u",
|
|
np->mp_pgno, mc->mc_txn->mt_env->me_psize));
|
|
np->mp_flags = flags | P_DIRTY;
|
|
np->mp_lower = PAGEHDRSZ;
|
|
np->mp_upper = mc->mc_txn->mt_env->me_psize;
|
|
|
|
if (IS_BRANCH(np))
|
|
mc->mc_db->md_branch_pages++;
|
|
else if (IS_LEAF(np))
|
|
mc->mc_db->md_leaf_pages++;
|
|
else if (IS_OVERFLOW(np)) {
|
|
mc->mc_db->md_overflow_pages += num;
|
|
np->mp_pages = num;
|
|
}
|
|
*mp = np;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/** Calculate the size of a leaf node.
|
|
* The size depends on the environment's page size; if a data item
|
|
* is too large it will be put onto an overflow page and the node
|
|
* size will only include the key and not the data. Sizes are always
|
|
* rounded up to an even number of bytes, to guarantee 2-byte alignment
|
|
* of the #MDB_node headers.
|
|
* @param[in] env The environment handle.
|
|
* @param[in] key The key for the node.
|
|
* @param[in] data The data for the node.
|
|
* @return The number of bytes needed to store the node.
|
|
*/
|
|
static size_t
|
|
mdb_leaf_size(MDB_env *env, MDB_val *key, MDB_val *data)
|
|
{
|
|
size_t sz;
|
|
|
|
sz = LEAFSIZE(key, data);
|
|
if (sz >= env->me_nodemax) {
|
|
/* put on overflow page */
|
|
sz -= data->mv_size - sizeof(pgno_t);
|
|
}
|
|
sz += sz & 1;
|
|
|
|
return sz + sizeof(indx_t);
|
|
}
|
|
|
|
/** Calculate the size of a branch node.
|
|
* The size should depend on the environment's page size but since
|
|
* we currently don't support spilling large keys onto overflow
|
|
* pages, it's simply the size of the #MDB_node header plus the
|
|
* size of the key. Sizes are always rounded up to an even number
|
|
* of bytes, to guarantee 2-byte alignment of the #MDB_node headers.
|
|
* @param[in] env The environment handle.
|
|
* @param[in] key The key for the node.
|
|
* @return The number of bytes needed to store the node.
|
|
*/
|
|
static size_t
|
|
mdb_branch_size(MDB_env *env, MDB_val *key)
|
|
{
|
|
size_t sz;
|
|
|
|
sz = INDXSIZE(key);
|
|
if (sz >= env->me_nodemax) {
|
|
/* put on overflow page */
|
|
/* not implemented */
|
|
/* sz -= key->size - sizeof(pgno_t); */
|
|
}
|
|
|
|
return sz + sizeof(indx_t);
|
|
}
|
|
|
|
/** Add a node to the page pointed to by the cursor.
|
|
* @param[in] mc The cursor for this operation.
|
|
* @param[in] indx The index on the page where the new node should be added.
|
|
* @param[in] key The key for the new node.
|
|
* @param[in] data The data for the new node, if any.
|
|
* @param[in] pgno The page number, if adding a branch node.
|
|
* @param[in] flags Flags for the node.
|
|
* @return 0 on success, non-zero on failure. Possible errors are:
|
|
* <ul>
|
|
* <li>ENOMEM - failed to allocate overflow pages for the node.
|
|
* <li>MDB_PAGE_FULL - there is insufficient room in the page. This error
|
|
* should never happen since all callers already calculate the
|
|
* page's free space before calling this function.
|
|
* </ul>
|
|
*/
|
|
static int
|
|
mdb_node_add(MDB_cursor *mc, indx_t indx,
|
|
MDB_val *key, MDB_val *data, pgno_t pgno, unsigned int flags)
|
|
{
|
|
unsigned int i;
|
|
size_t node_size = NODESIZE;
|
|
indx_t ofs;
|
|
MDB_node *node;
|
|
MDB_page *mp = mc->mc_pg[mc->mc_top];
|
|
MDB_page *ofp = NULL; /* overflow page */
|
|
DKBUF;
|
|
|
|
assert(mp->mp_upper >= mp->mp_lower);
|
|
|
|
DPRINTF(("add to %s %spage %"Z"u index %i, data size %"Z"u key size %"Z"u [%s]",
|
|
IS_LEAF(mp) ? "leaf" : "branch",
|
|
IS_SUBP(mp) ? "sub-" : "",
|
|
mp->mp_pgno, indx, data ? data->mv_size : 0,
|
|
key ? key->mv_size : 0, key ? DKEY(key) : "null"));
|
|
|
|
if (IS_LEAF2(mp)) {
|
|
/* Move higher keys up one slot. */
|
|
int ksize = mc->mc_db->md_pad, dif;
|
|
char *ptr = LEAF2KEY(mp, indx, ksize);
|
|
dif = NUMKEYS(mp) - indx;
|
|
if (dif > 0)
|
|
memmove(ptr+ksize, ptr, dif*ksize);
|
|
/* insert new key */
|
|
memcpy(ptr, key->mv_data, ksize);
|
|
|
|
/* Just using these for counting */
|
|
mp->mp_lower += sizeof(indx_t);
|
|
mp->mp_upper -= ksize - sizeof(indx_t);
|
|
return MDB_SUCCESS;
|
|
}
|
|
|
|
if (key != NULL)
|
|
node_size += key->mv_size;
|
|
|
|
if (IS_LEAF(mp)) {
|
|
assert(data);
|
|
if (F_ISSET(flags, F_BIGDATA)) {
|
|
/* Data already on overflow page. */
|
|
node_size += sizeof(pgno_t);
|
|
} else if (node_size + data->mv_size >= mc->mc_txn->mt_env->me_nodemax) {
|
|
int ovpages = OVPAGES(data->mv_size, mc->mc_txn->mt_env->me_psize);
|
|
int rc;
|
|
/* Put data on overflow page. */
|
|
DPRINTF(("data size is %"Z"u, node would be %"Z"u, put data on overflow page",
|
|
data->mv_size, node_size+data->mv_size));
|
|
node_size += sizeof(pgno_t);
|
|
if ((rc = mdb_page_new(mc, P_OVERFLOW, ovpages, &ofp)))
|
|
return rc;
|
|
DPRINTF(("allocated overflow page %"Z"u", ofp->mp_pgno));
|
|
flags |= F_BIGDATA;
|
|
} else {
|
|
node_size += data->mv_size;
|
|
}
|
|
}
|
|
node_size += node_size & 1;
|
|
|
|
if (node_size + sizeof(indx_t) > SIZELEFT(mp)) {
|
|
DPRINTF(("not enough room in page %"Z"u, got %u ptrs",
|
|
mp->mp_pgno, NUMKEYS(mp)));
|
|
DPRINTF(("upper - lower = %u - %u = %u", mp->mp_upper, mp->mp_lower,
|
|
mp->mp_upper - mp->mp_lower));
|
|
DPRINTF(("node size = %"Z"u", node_size));
|
|
return MDB_PAGE_FULL;
|
|
}
|
|
|
|
/* Move higher pointers up one slot. */
|
|
for (i = NUMKEYS(mp); i > indx; i--)
|
|
mp->mp_ptrs[i] = mp->mp_ptrs[i - 1];
|
|
|
|
/* Adjust free space offsets. */
|
|
ofs = mp->mp_upper - node_size;
|
|
assert(ofs >= mp->mp_lower + sizeof(indx_t));
|
|
mp->mp_ptrs[indx] = ofs;
|
|
mp->mp_upper = ofs;
|
|
mp->mp_lower += sizeof(indx_t);
|
|
|
|
/* Write the node data. */
|
|
node = NODEPTR(mp, indx);
|
|
node->mn_ksize = (key == NULL) ? 0 : key->mv_size;
|
|
node->mn_flags = flags;
|
|
if (IS_LEAF(mp))
|
|
SETDSZ(node,data->mv_size);
|
|
else
|
|
SETPGNO(node,pgno);
|
|
|
|
if (key)
|
|
memcpy(NODEKEY(node), key->mv_data, key->mv_size);
|
|
|
|
if (IS_LEAF(mp)) {
|
|
assert(key);
|
|
if (ofp == NULL) {
|
|
if (F_ISSET(flags, F_BIGDATA))
|
|
memcpy(node->mn_data + key->mv_size, data->mv_data,
|
|
sizeof(pgno_t));
|
|
else if (F_ISSET(flags, MDB_RESERVE))
|
|
data->mv_data = node->mn_data + key->mv_size;
|
|
else
|
|
memcpy(node->mn_data + key->mv_size, data->mv_data,
|
|
data->mv_size);
|
|
} else {
|
|
memcpy(node->mn_data + key->mv_size, &ofp->mp_pgno,
|
|
sizeof(pgno_t));
|
|
if (F_ISSET(flags, MDB_RESERVE))
|
|
data->mv_data = METADATA(ofp);
|
|
else
|
|
memcpy(METADATA(ofp), data->mv_data, data->mv_size);
|
|
}
|
|
}
|
|
|
|
return MDB_SUCCESS;
|
|
}
|
|
|
|
/** Delete the specified node from a page.
|
|
* @param[in] mp The page to operate on.
|
|
* @param[in] indx The index of the node to delete.
|
|
* @param[in] ksize The size of a node. Only used if the page is
|
|
* part of a #MDB_DUPFIXED database.
|
|
*/
|
|
static void
|
|
mdb_node_del(MDB_page *mp, indx_t indx, int ksize)
|
|
{
|
|
unsigned int sz;
|
|
indx_t i, j, numkeys, ptr;
|
|
MDB_node *node;
|
|
char *base;
|
|
|
|
#if MDB_DEBUG
|
|
{
|
|
pgno_t pgno;
|
|
COPY_PGNO(pgno, mp->mp_pgno);
|
|
DPRINTF(("delete node %u on %s page %"Z"u", indx,
|
|
IS_LEAF(mp) ? "leaf" : "branch", pgno));
|
|
}
|
|
#endif
|
|
assert(indx < NUMKEYS(mp));
|
|
|
|
if (IS_LEAF2(mp)) {
|
|
int x = NUMKEYS(mp) - 1 - indx;
|
|
base = LEAF2KEY(mp, indx, ksize);
|
|
if (x)
|
|
memmove(base, base + ksize, x * ksize);
|
|
mp->mp_lower -= sizeof(indx_t);
|
|
mp->mp_upper += ksize - sizeof(indx_t);
|
|
return;
|
|
}
|
|
|
|
node = NODEPTR(mp, indx);
|
|
sz = NODESIZE + node->mn_ksize;
|
|
if (IS_LEAF(mp)) {
|
|
if (F_ISSET(node->mn_flags, F_BIGDATA))
|
|
sz += sizeof(pgno_t);
|
|
else
|
|
sz += NODEDSZ(node);
|
|
}
|
|
sz += sz & 1;
|
|
|
|
ptr = mp->mp_ptrs[indx];
|
|
numkeys = NUMKEYS(mp);
|
|
for (i = j = 0; i < numkeys; i++) {
|
|
if (i != indx) {
|
|
mp->mp_ptrs[j] = mp->mp_ptrs[i];
|
|
if (mp->mp_ptrs[i] < ptr)
|
|
mp->mp_ptrs[j] += sz;
|
|
j++;
|
|
}
|
|
}
|
|
|
|
base = (char *)mp + mp->mp_upper;
|
|
memmove(base + sz, base, ptr - mp->mp_upper);
|
|
|
|
mp->mp_lower -= sizeof(indx_t);
|
|
mp->mp_upper += sz;
|
|
}
|
|
|
|
/** Compact the main page after deleting a node on a subpage.
|
|
* @param[in] mp The main page to operate on.
|
|
* @param[in] indx The index of the subpage on the main page.
|
|
*/
|
|
static void
|
|
mdb_node_shrink(MDB_page *mp, indx_t indx)
|
|
{
|
|
MDB_node *node;
|
|
MDB_page *sp, *xp;
|
|
char *base;
|
|
int osize, nsize;
|
|
int delta;
|
|
indx_t i, numkeys, ptr;
|
|
|
|
node = NODEPTR(mp, indx);
|
|
sp = (MDB_page *)NODEDATA(node);
|
|
osize = NODEDSZ(node);
|
|
|
|
delta = sp->mp_upper - sp->mp_lower;
|
|
SETDSZ(node, osize - delta);
|
|
xp = (MDB_page *)((char *)sp + delta);
|
|
|
|
/* shift subpage upward */
|
|
if (IS_LEAF2(sp)) {
|
|
nsize = NUMKEYS(sp) * sp->mp_pad;
|
|
memmove(METADATA(xp), METADATA(sp), nsize);
|
|
} else {
|
|
int i;
|
|
nsize = osize - sp->mp_upper;
|
|
numkeys = NUMKEYS(sp);
|
|
for (i=numkeys-1; i>=0; i--)
|
|
xp->mp_ptrs[i] = sp->mp_ptrs[i] - delta;
|
|
}
|
|
xp->mp_upper = sp->mp_lower;
|
|
xp->mp_lower = sp->mp_lower;
|
|
xp->mp_flags = sp->mp_flags;
|
|
xp->mp_pad = sp->mp_pad;
|
|
COPY_PGNO(xp->mp_pgno, mp->mp_pgno);
|
|
|
|
/* shift lower nodes upward */
|
|
ptr = mp->mp_ptrs[indx];
|
|
numkeys = NUMKEYS(mp);
|
|
for (i = 0; i < numkeys; i++) {
|
|
if (mp->mp_ptrs[i] <= ptr)
|
|
mp->mp_ptrs[i] += delta;
|
|
}
|
|
|
|
base = (char *)mp + mp->mp_upper;
|
|
memmove(base + delta, base, ptr - mp->mp_upper + NODESIZE + NODEKSZ(node));
|
|
mp->mp_upper += delta;
|
|
}
|
|
|
|
/** Initial setup of a sorted-dups cursor.
|
|
* Sorted duplicates are implemented as a sub-database for the given key.
|
|
* The duplicate data items are actually keys of the sub-database.
|
|
* Operations on the duplicate data items are performed using a sub-cursor
|
|
* initialized when the sub-database is first accessed. This function does
|
|
* the preliminary setup of the sub-cursor, filling in the fields that
|
|
* depend only on the parent DB.
|
|
* @param[in] mc The main cursor whose sorted-dups cursor is to be initialized.
|
|
*/
|
|
static void
|
|
mdb_xcursor_init0(MDB_cursor *mc)
|
|
{
|
|
MDB_xcursor *mx = mc->mc_xcursor;
|
|
|
|
mx->mx_cursor.mc_xcursor = NULL;
|
|
mx->mx_cursor.mc_txn = mc->mc_txn;
|
|
mx->mx_cursor.mc_db = &mx->mx_db;
|
|
mx->mx_cursor.mc_dbx = &mx->mx_dbx;
|
|
mx->mx_cursor.mc_dbi = mc->mc_dbi;
|
|
mx->mx_cursor.mc_dbflag = &mx->mx_dbflag;
|
|
mx->mx_cursor.mc_snum = 0;
|
|
mx->mx_cursor.mc_top = 0;
|
|
mx->mx_cursor.mc_flags = C_SUB;
|
|
mx->mx_dbx.md_name.mv_size = 0;
|
|
mx->mx_dbx.md_name.mv_data = NULL;
|
|
mx->mx_dbx.md_cmp = mc->mc_dbx->md_dcmp;
|
|
mx->mx_dbx.md_dcmp = NULL;
|
|
mx->mx_dbx.md_rel = mc->mc_dbx->md_rel;
|
|
}
|
|
|
|
/** Final setup of a sorted-dups cursor.
|
|
* Sets up the fields that depend on the data from the main cursor.
|
|
* @param[in] mc The main cursor whose sorted-dups cursor is to be initialized.
|
|
* @param[in] node The data containing the #MDB_db record for the
|
|
* sorted-dup database.
|
|
*/
|
|
static void
|
|
mdb_xcursor_init1(MDB_cursor *mc, MDB_node *node)
|
|
{
|
|
MDB_xcursor *mx = mc->mc_xcursor;
|
|
|
|
if (node->mn_flags & F_SUBDATA) {
|
|
memcpy(&mx->mx_db, NODEDATA(node), sizeof(MDB_db));
|
|
mx->mx_cursor.mc_pg[0] = 0;
|
|
mx->mx_cursor.mc_snum = 0;
|
|
mx->mx_cursor.mc_flags = C_SUB;
|
|
} else {
|
|
MDB_page *fp = NODEDATA(node);
|
|
mx->mx_db.md_pad = mc->mc_pg[mc->mc_top]->mp_pad;
|
|
mx->mx_db.md_flags = 0;
|
|
mx->mx_db.md_depth = 1;
|
|
mx->mx_db.md_branch_pages = 0;
|
|
mx->mx_db.md_leaf_pages = 1;
|
|
mx->mx_db.md_overflow_pages = 0;
|
|
mx->mx_db.md_entries = NUMKEYS(fp);
|
|
COPY_PGNO(mx->mx_db.md_root, fp->mp_pgno);
|
|
mx->mx_cursor.mc_snum = 1;
|
|
mx->mx_cursor.mc_flags = C_INITIALIZED|C_SUB;
|
|
mx->mx_cursor.mc_top = 0;
|
|
mx->mx_cursor.mc_pg[0] = fp;
|
|
mx->mx_cursor.mc_ki[0] = 0;
|
|
if (mc->mc_db->md_flags & MDB_DUPFIXED) {
|
|
mx->mx_db.md_flags = MDB_DUPFIXED;
|
|
mx->mx_db.md_pad = fp->mp_pad;
|
|
if (mc->mc_db->md_flags & MDB_INTEGERDUP)
|
|
mx->mx_db.md_flags |= MDB_INTEGERKEY;
|
|
}
|
|
}
|
|
DPRINTF(("Sub-db -%u root page %"Z"u", mx->mx_cursor.mc_dbi,
|
|
mx->mx_db.md_root));
|
|
mx->mx_dbflag = DB_VALID|DB_DIRTY; /* DB_DIRTY guides mdb_cursor_touch */
|
|
#if UINT_MAX < SIZE_MAX
|
|
if (mx->mx_dbx.md_cmp == mdb_cmp_int && mx->mx_db.md_pad == sizeof(size_t))
|
|
#ifdef MISALIGNED_OK
|
|
mx->mx_dbx.md_cmp = mdb_cmp_long;
|
|
#else
|
|
mx->mx_dbx.md_cmp = mdb_cmp_cint;
|
|
#endif
|
|
#endif
|
|
}
|
|
|
|
/** Initialize a cursor for a given transaction and database. */
|
|
static void
|
|
mdb_cursor_init(MDB_cursor *mc, MDB_txn *txn, MDB_dbi dbi, MDB_xcursor *mx)
|
|
{
|
|
mc->mc_next = NULL;
|
|
mc->mc_backup = NULL;
|
|
mc->mc_dbi = dbi;
|
|
mc->mc_txn = txn;
|
|
mc->mc_db = &txn->mt_dbs[dbi];
|
|
mc->mc_dbx = &txn->mt_dbxs[dbi];
|
|
mc->mc_dbflag = &txn->mt_dbflags[dbi];
|
|
mc->mc_snum = 0;
|
|
mc->mc_top = 0;
|
|
mc->mc_pg[0] = 0;
|
|
mc->mc_flags = 0;
|
|
if (txn->mt_dbs[dbi].md_flags & MDB_DUPSORT) {
|
|
assert(mx != NULL);
|
|
mc->mc_xcursor = mx;
|
|
mdb_xcursor_init0(mc);
|
|
} else {
|
|
mc->mc_xcursor = NULL;
|
|
}
|
|
if (*mc->mc_dbflag & DB_STALE) {
|
|
mdb_page_search(mc, NULL, MDB_PS_ROOTONLY);
|
|
}
|
|
}
|
|
|
|
int
|
|
mdb_cursor_open(MDB_txn *txn, MDB_dbi dbi, MDB_cursor **ret)
|
|
{
|
|
MDB_cursor *mc;
|
|
size_t size = sizeof(MDB_cursor);
|
|
|
|
if (txn == NULL || ret == NULL || dbi >= txn->mt_numdbs || !(txn->mt_dbflags[dbi] & DB_VALID))
|
|
return EINVAL;
|
|
|
|
if (txn->mt_flags & MDB_TXN_ERROR)
|
|
return MDB_BAD_TXN;
|
|
|
|
/* Allow read access to the freelist */
|
|
if (!dbi && !F_ISSET(txn->mt_flags, MDB_TXN_RDONLY))
|
|
return EINVAL;
|
|
|
|
if (txn->mt_dbs[dbi].md_flags & MDB_DUPSORT)
|
|
size += sizeof(MDB_xcursor);
|
|
|
|
if ((mc = malloc(size)) != NULL) {
|
|
mdb_cursor_init(mc, txn, dbi, (MDB_xcursor *)(mc + 1));
|
|
if (txn->mt_cursors) {
|
|
mc->mc_next = txn->mt_cursors[dbi];
|
|
txn->mt_cursors[dbi] = mc;
|
|
mc->mc_flags |= C_UNTRACK;
|
|
}
|
|
} else {
|
|
return ENOMEM;
|
|
}
|
|
|
|
*ret = mc;
|
|
|
|
return MDB_SUCCESS;
|
|
}
|
|
|
|
int
|
|
mdb_cursor_renew(MDB_txn *txn, MDB_cursor *mc)
|
|
{
|
|
if (txn == NULL || mc == NULL || mc->mc_dbi >= txn->mt_numdbs)
|
|
return EINVAL;
|
|
|
|
if ((mc->mc_flags & C_UNTRACK) || txn->mt_cursors)
|
|
return EINVAL;
|
|
|
|
mdb_cursor_init(mc, txn, mc->mc_dbi, mc->mc_xcursor);
|
|
return MDB_SUCCESS;
|
|
}
|
|
|
|
/* Return the count of duplicate data items for the current key */
|
|
int
|
|
mdb_cursor_count(MDB_cursor *mc, size_t *countp)
|
|
{
|
|
MDB_node *leaf;
|
|
|
|
if (mc == NULL || countp == NULL)
|
|
return EINVAL;
|
|
|
|
if (mc->mc_xcursor == NULL)
|
|
return MDB_INCOMPATIBLE;
|
|
|
|
leaf = NODEPTR(mc->mc_pg[mc->mc_top], mc->mc_ki[mc->mc_top]);
|
|
if (!F_ISSET(leaf->mn_flags, F_DUPDATA)) {
|
|
*countp = 1;
|
|
} else {
|
|
if (!(mc->mc_xcursor->mx_cursor.mc_flags & C_INITIALIZED))
|
|
return EINVAL;
|
|
|
|
*countp = mc->mc_xcursor->mx_db.md_entries;
|
|
}
|
|
return MDB_SUCCESS;
|
|
}
|
|
|
|
void
|
|
mdb_cursor_close(MDB_cursor *mc)
|
|
{
|
|
if (mc && !mc->mc_backup) {
|
|
/* remove from txn, if tracked */
|
|
if ((mc->mc_flags & C_UNTRACK) && mc->mc_txn->mt_cursors) {
|
|
MDB_cursor **prev = &mc->mc_txn->mt_cursors[mc->mc_dbi];
|
|
while (*prev && *prev != mc) prev = &(*prev)->mc_next;
|
|
if (*prev == mc)
|
|
*prev = mc->mc_next;
|
|
}
|
|
free(mc);
|
|
}
|
|
}
|
|
|
|
MDB_txn *
|
|
mdb_cursor_txn(MDB_cursor *mc)
|
|
{
|
|
if (!mc) return NULL;
|
|
return mc->mc_txn;
|
|
}
|
|
|
|
MDB_dbi
|
|
mdb_cursor_dbi(MDB_cursor *mc)
|
|
{
|
|
assert(mc != NULL);
|
|
return mc->mc_dbi;
|
|
}
|
|
|
|
/** Replace the key for a node with a new key.
|
|
* @param[in] mc Cursor pointing to the node to operate on.
|
|
* @param[in] key The new key to use.
|
|
* @return 0 on success, non-zero on failure.
|
|
*/
|
|
static int
|
|
mdb_update_key(MDB_cursor *mc, MDB_val *key)
|
|
{
|
|
MDB_page *mp;
|
|
MDB_node *node;
|
|
char *base;
|
|
size_t len;
|
|
int delta, delta0;
|
|
indx_t ptr, i, numkeys, indx;
|
|
DKBUF;
|
|
|
|
indx = mc->mc_ki[mc->mc_top];
|
|
mp = mc->mc_pg[mc->mc_top];
|
|
node = NODEPTR(mp, indx);
|
|
ptr = mp->mp_ptrs[indx];
|
|
#if MDB_DEBUG
|
|
{
|
|
MDB_val k2;
|
|
char kbuf2[(MDB_MAXKEYSIZE*2+1)];
|
|
k2.mv_data = NODEKEY(node);
|
|
k2.mv_size = node->mn_ksize;
|
|
DPRINTF(("update key %u (ofs %u) [%s] to [%s] on page %"Z"u",
|
|
indx, ptr,
|
|
mdb_dkey(&k2, kbuf2),
|
|
DKEY(key),
|
|
mp->mp_pgno));
|
|
}
|
|
#endif
|
|
|
|
delta0 = delta = key->mv_size - node->mn_ksize;
|
|
|
|
/* Must be 2-byte aligned. If new key is
|
|
* shorter by 1, the shift will be skipped.
|
|
*/
|
|
delta += (delta & 1);
|
|
if (delta) {
|
|
if (delta > 0 && SIZELEFT(mp) < delta) {
|
|
pgno_t pgno;
|
|
/* not enough space left, do a delete and split */
|
|
DPRINTF(("Not enough room, delta = %d, splitting...", delta));
|
|
pgno = NODEPGNO(node);
|
|
mdb_node_del(mc->mc_pg[mc->mc_top], mc->mc_ki[mc->mc_top], 0);
|
|
return mdb_page_split(mc, key, NULL, pgno, MDB_SPLIT_REPLACE);
|
|
}
|
|
|
|
numkeys = NUMKEYS(mp);
|
|
for (i = 0; i < numkeys; i++) {
|
|
if (mp->mp_ptrs[i] <= ptr)
|
|
mp->mp_ptrs[i] -= delta;
|
|
}
|
|
|
|
base = (char *)mp + mp->mp_upper;
|
|
len = ptr - mp->mp_upper + NODESIZE;
|
|
memmove(base - delta, base, len);
|
|
mp->mp_upper -= delta;
|
|
|
|
node = NODEPTR(mp, indx);
|
|
}
|
|
|
|
/* But even if no shift was needed, update ksize */
|
|
if (delta0)
|
|
node->mn_ksize = key->mv_size;
|
|
|
|
if (key->mv_size)
|
|
memcpy(NODEKEY(node), key->mv_data, key->mv_size);
|
|
|
|
return MDB_SUCCESS;
|
|
}
|
|
|
|
static void
|
|
mdb_cursor_copy(const MDB_cursor *csrc, MDB_cursor *cdst);
|
|
|
|
/** Move a node from csrc to cdst.
|
|
*/
|
|
static int
|
|
mdb_node_move(MDB_cursor *csrc, MDB_cursor *cdst)
|
|
{
|
|
MDB_node *srcnode;
|
|
MDB_val key, data;
|
|
pgno_t srcpg;
|
|
MDB_cursor mn;
|
|
int rc;
|
|
unsigned short flags;
|
|
|
|
DKBUF;
|
|
|
|
/* Mark src and dst as dirty. */
|
|
if ((rc = mdb_page_touch(csrc)) ||
|
|
(rc = mdb_page_touch(cdst)))
|
|
return rc;
|
|
|
|
if (IS_LEAF2(csrc->mc_pg[csrc->mc_top])) {
|
|
srcnode = NODEPTR(csrc->mc_pg[csrc->mc_top], 0); /* fake */
|
|
key.mv_size = csrc->mc_db->md_pad;
|
|
key.mv_data = LEAF2KEY(csrc->mc_pg[csrc->mc_top], csrc->mc_ki[csrc->mc_top], key.mv_size);
|
|
data.mv_size = 0;
|
|
data.mv_data = NULL;
|
|
srcpg = 0;
|
|
flags = 0;
|
|
} else {
|
|
srcnode = NODEPTR(csrc->mc_pg[csrc->mc_top], csrc->mc_ki[csrc->mc_top]);
|
|
assert(!((long)srcnode&1));
|
|
srcpg = NODEPGNO(srcnode);
|
|
flags = srcnode->mn_flags;
|
|
if (csrc->mc_ki[csrc->mc_top] == 0 && IS_BRANCH(csrc->mc_pg[csrc->mc_top])) {
|
|
unsigned int snum = csrc->mc_snum;
|
|
MDB_node *s2;
|
|
/* must find the lowest key below src */
|
|
mdb_page_search_lowest(csrc);
|
|
if (IS_LEAF2(csrc->mc_pg[csrc->mc_top])) {
|
|
key.mv_size = csrc->mc_db->md_pad;
|
|
key.mv_data = LEAF2KEY(csrc->mc_pg[csrc->mc_top], 0, key.mv_size);
|
|
} else {
|
|
s2 = NODEPTR(csrc->mc_pg[csrc->mc_top], 0);
|
|
key.mv_size = NODEKSZ(s2);
|
|
key.mv_data = NODEKEY(s2);
|
|
}
|
|
csrc->mc_snum = snum--;
|
|
csrc->mc_top = snum;
|
|
} else {
|
|
key.mv_size = NODEKSZ(srcnode);
|
|
key.mv_data = NODEKEY(srcnode);
|
|
}
|
|
data.mv_size = NODEDSZ(srcnode);
|
|
data.mv_data = NODEDATA(srcnode);
|
|
}
|
|
if (IS_BRANCH(cdst->mc_pg[cdst->mc_top]) && cdst->mc_ki[cdst->mc_top] == 0) {
|
|
unsigned int snum = cdst->mc_snum;
|
|
MDB_node *s2;
|
|
MDB_val bkey;
|
|
/* must find the lowest key below dst */
|
|
mdb_page_search_lowest(cdst);
|
|
if (IS_LEAF2(cdst->mc_pg[cdst->mc_top])) {
|
|
bkey.mv_size = cdst->mc_db->md_pad;
|
|
bkey.mv_data = LEAF2KEY(cdst->mc_pg[cdst->mc_top], 0, bkey.mv_size);
|
|
} else {
|
|
s2 = NODEPTR(cdst->mc_pg[cdst->mc_top], 0);
|
|
bkey.mv_size = NODEKSZ(s2);
|
|
bkey.mv_data = NODEKEY(s2);
|
|
}
|
|
cdst->mc_snum = snum--;
|
|
cdst->mc_top = snum;
|
|
mdb_cursor_copy(cdst, &mn);
|
|
mn.mc_ki[snum] = 0;
|
|
rc = mdb_update_key(&mn, &bkey);
|
|
if (rc)
|
|
return rc;
|
|
}
|
|
|
|
DPRINTF(("moving %s node %u [%s] on page %"Z"u to node %u on page %"Z"u",
|
|
IS_LEAF(csrc->mc_pg[csrc->mc_top]) ? "leaf" : "branch",
|
|
csrc->mc_ki[csrc->mc_top],
|
|
DKEY(&key),
|
|
csrc->mc_pg[csrc->mc_top]->mp_pgno,
|
|
cdst->mc_ki[cdst->mc_top], cdst->mc_pg[cdst->mc_top]->mp_pgno));
|
|
|
|
/* Add the node to the destination page.
|
|
*/
|
|
rc = mdb_node_add(cdst, cdst->mc_ki[cdst->mc_top], &key, &data, srcpg, flags);
|
|
if (rc != MDB_SUCCESS)
|
|
return rc;
|
|
|
|
/* Delete the node from the source page.
|
|
*/
|
|
mdb_node_del(csrc->mc_pg[csrc->mc_top], csrc->mc_ki[csrc->mc_top], key.mv_size);
|
|
|
|
{
|
|
/* Adjust other cursors pointing to mp */
|
|
MDB_cursor *m2, *m3;
|
|
MDB_dbi dbi = csrc->mc_dbi;
|
|
MDB_page *mp = csrc->mc_pg[csrc->mc_top];
|
|
|
|
for (m2 = csrc->mc_txn->mt_cursors[dbi]; m2; m2=m2->mc_next) {
|
|
if (csrc->mc_flags & C_SUB)
|
|
m3 = &m2->mc_xcursor->mx_cursor;
|
|
else
|
|
m3 = m2;
|
|
if (m3 == csrc) continue;
|
|
if (m3->mc_pg[csrc->mc_top] == mp && m3->mc_ki[csrc->mc_top] ==
|
|
csrc->mc_ki[csrc->mc_top]) {
|
|
m3->mc_pg[csrc->mc_top] = cdst->mc_pg[cdst->mc_top];
|
|
m3->mc_ki[csrc->mc_top] = cdst->mc_ki[cdst->mc_top];
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Update the parent separators.
|
|
*/
|
|
if (csrc->mc_ki[csrc->mc_top] == 0) {
|
|
if (csrc->mc_ki[csrc->mc_top-1] != 0) {
|
|
if (IS_LEAF2(csrc->mc_pg[csrc->mc_top])) {
|
|
key.mv_data = LEAF2KEY(csrc->mc_pg[csrc->mc_top], 0, key.mv_size);
|
|
} else {
|
|
srcnode = NODEPTR(csrc->mc_pg[csrc->mc_top], 0);
|
|
key.mv_size = NODEKSZ(srcnode);
|
|
key.mv_data = NODEKEY(srcnode);
|
|
}
|
|
DPRINTF(("update separator for source page %"Z"u to [%s]",
|
|
csrc->mc_pg[csrc->mc_top]->mp_pgno, DKEY(&key)));
|
|
mdb_cursor_copy(csrc, &mn);
|
|
mn.mc_snum--;
|
|
mn.mc_top--;
|
|
if ((rc = mdb_update_key(&mn, &key)) != MDB_SUCCESS)
|
|
return rc;
|
|
}
|
|
if (IS_BRANCH(csrc->mc_pg[csrc->mc_top])) {
|
|
MDB_val nullkey;
|
|
indx_t ix = csrc->mc_ki[csrc->mc_top];
|
|
nullkey.mv_size = 0;
|
|
csrc->mc_ki[csrc->mc_top] = 0;
|
|
rc = mdb_update_key(csrc, &nullkey);
|
|
csrc->mc_ki[csrc->mc_top] = ix;
|
|
assert(rc == MDB_SUCCESS);
|
|
}
|
|
}
|
|
|
|
if (cdst->mc_ki[cdst->mc_top] == 0) {
|
|
if (cdst->mc_ki[cdst->mc_top-1] != 0) {
|
|
if (IS_LEAF2(csrc->mc_pg[csrc->mc_top])) {
|
|
key.mv_data = LEAF2KEY(cdst->mc_pg[cdst->mc_top], 0, key.mv_size);
|
|
} else {
|
|
srcnode = NODEPTR(cdst->mc_pg[cdst->mc_top], 0);
|
|
key.mv_size = NODEKSZ(srcnode);
|
|
key.mv_data = NODEKEY(srcnode);
|
|
}
|
|
DPRINTF(("update separator for destination page %"Z"u to [%s]",
|
|
cdst->mc_pg[cdst->mc_top]->mp_pgno, DKEY(&key)));
|
|
mdb_cursor_copy(cdst, &mn);
|
|
mn.mc_snum--;
|
|
mn.mc_top--;
|
|
if ((rc = mdb_update_key(&mn, &key)) != MDB_SUCCESS)
|
|
return rc;
|
|
}
|
|
if (IS_BRANCH(cdst->mc_pg[cdst->mc_top])) {
|
|
MDB_val nullkey;
|
|
indx_t ix = cdst->mc_ki[cdst->mc_top];
|
|
nullkey.mv_size = 0;
|
|
cdst->mc_ki[cdst->mc_top] = 0;
|
|
rc = mdb_update_key(cdst, &nullkey);
|
|
cdst->mc_ki[cdst->mc_top] = ix;
|
|
assert(rc == MDB_SUCCESS);
|
|
}
|
|
}
|
|
|
|
return MDB_SUCCESS;
|
|
}
|
|
|
|
/** Merge one page into another.
|
|
* The nodes from the page pointed to by \b csrc will
|
|
* be copied to the page pointed to by \b cdst and then
|
|
* the \b csrc page will be freed.
|
|
* @param[in] csrc Cursor pointing to the source page.
|
|
* @param[in] cdst Cursor pointing to the destination page.
|
|
*/
|
|
static int
|
|
mdb_page_merge(MDB_cursor *csrc, MDB_cursor *cdst)
|
|
{
|
|
int rc;
|
|
indx_t i, j;
|
|
MDB_node *srcnode;
|
|
MDB_val key, data;
|
|
unsigned nkeys;
|
|
|
|
DPRINTF(("merging page %"Z"u into %"Z"u", csrc->mc_pg[csrc->mc_top]->mp_pgno,
|
|
cdst->mc_pg[cdst->mc_top]->mp_pgno));
|
|
|
|
assert(csrc->mc_snum > 1); /* can't merge root page */
|
|
assert(cdst->mc_snum > 1);
|
|
|
|
/* Mark dst as dirty. */
|
|
if ((rc = mdb_page_touch(cdst)))
|
|
return rc;
|
|
|
|
/* Move all nodes from src to dst.
|
|
*/
|
|
j = nkeys = NUMKEYS(cdst->mc_pg[cdst->mc_top]);
|
|
if (IS_LEAF2(csrc->mc_pg[csrc->mc_top])) {
|
|
key.mv_size = csrc->mc_db->md_pad;
|
|
key.mv_data = METADATA(csrc->mc_pg[csrc->mc_top]);
|
|
for (i = 0; i < NUMKEYS(csrc->mc_pg[csrc->mc_top]); i++, j++) {
|
|
rc = mdb_node_add(cdst, j, &key, NULL, 0, 0);
|
|
if (rc != MDB_SUCCESS)
|
|
return rc;
|
|
key.mv_data = (char *)key.mv_data + key.mv_size;
|
|
}
|
|
} else {
|
|
for (i = 0; i < NUMKEYS(csrc->mc_pg[csrc->mc_top]); i++, j++) {
|
|
srcnode = NODEPTR(csrc->mc_pg[csrc->mc_top], i);
|
|
if (i == 0 && IS_BRANCH(csrc->mc_pg[csrc->mc_top])) {
|
|
unsigned int snum = csrc->mc_snum;
|
|
MDB_node *s2;
|
|
/* must find the lowest key below src */
|
|
mdb_page_search_lowest(csrc);
|
|
if (IS_LEAF2(csrc->mc_pg[csrc->mc_top])) {
|
|
key.mv_size = csrc->mc_db->md_pad;
|
|
key.mv_data = LEAF2KEY(csrc->mc_pg[csrc->mc_top], 0, key.mv_size);
|
|
} else {
|
|
s2 = NODEPTR(csrc->mc_pg[csrc->mc_top], 0);
|
|
key.mv_size = NODEKSZ(s2);
|
|
key.mv_data = NODEKEY(s2);
|
|
}
|
|
csrc->mc_snum = snum--;
|
|
csrc->mc_top = snum;
|
|
} else {
|
|
key.mv_size = srcnode->mn_ksize;
|
|
key.mv_data = NODEKEY(srcnode);
|
|
}
|
|
|
|
data.mv_size = NODEDSZ(srcnode);
|
|
data.mv_data = NODEDATA(srcnode);
|
|
rc = mdb_node_add(cdst, j, &key, &data, NODEPGNO(srcnode), srcnode->mn_flags);
|
|
if (rc != MDB_SUCCESS)
|
|
return rc;
|
|
}
|
|
}
|
|
|
|
DPRINTF(("dst page %"Z"u now has %u keys (%.1f%% filled)",
|
|
cdst->mc_pg[cdst->mc_top]->mp_pgno, NUMKEYS(cdst->mc_pg[cdst->mc_top]),
|
|
(float)PAGEFILL(cdst->mc_txn->mt_env, cdst->mc_pg[cdst->mc_top]) / 10));
|
|
|
|
/* Unlink the src page from parent and add to free list.
|
|
*/
|
|
mdb_node_del(csrc->mc_pg[csrc->mc_top-1], csrc->mc_ki[csrc->mc_top-1], 0);
|
|
if (csrc->mc_ki[csrc->mc_top-1] == 0) {
|
|
key.mv_size = 0;
|
|
csrc->mc_top--;
|
|
rc = mdb_update_key(csrc, &key);
|
|
csrc->mc_top++;
|
|
if (rc)
|
|
return rc;
|
|
}
|
|
|
|
rc = mdb_midl_append(&csrc->mc_txn->mt_free_pgs,
|
|
csrc->mc_pg[csrc->mc_top]->mp_pgno);
|
|
if (rc)
|
|
return rc;
|
|
if (IS_LEAF(csrc->mc_pg[csrc->mc_top]))
|
|
csrc->mc_db->md_leaf_pages--;
|
|
else
|
|
csrc->mc_db->md_branch_pages--;
|
|
{
|
|
/* Adjust other cursors pointing to mp */
|
|
MDB_cursor *m2, *m3;
|
|
MDB_dbi dbi = csrc->mc_dbi;
|
|
MDB_page *mp = cdst->mc_pg[cdst->mc_top];
|
|
|
|
for (m2 = csrc->mc_txn->mt_cursors[dbi]; m2; m2=m2->mc_next) {
|
|
if (csrc->mc_flags & C_SUB)
|
|
m3 = &m2->mc_xcursor->mx_cursor;
|
|
else
|
|
m3 = m2;
|
|
if (m3 == csrc) continue;
|
|
if (m3->mc_snum < csrc->mc_snum) continue;
|
|
if (m3->mc_pg[csrc->mc_top] == csrc->mc_pg[csrc->mc_top]) {
|
|
m3->mc_pg[csrc->mc_top] = mp;
|
|
m3->mc_ki[csrc->mc_top] += nkeys;
|
|
}
|
|
}
|
|
}
|
|
mdb_cursor_pop(csrc);
|
|
|
|
return mdb_rebalance(csrc);
|
|
}
|
|
|
|
/** Copy the contents of a cursor.
|
|
* @param[in] csrc The cursor to copy from.
|
|
* @param[out] cdst The cursor to copy to.
|
|
*/
|
|
static void
|
|
mdb_cursor_copy(const MDB_cursor *csrc, MDB_cursor *cdst)
|
|
{
|
|
unsigned int i;
|
|
|
|
cdst->mc_txn = csrc->mc_txn;
|
|
cdst->mc_dbi = csrc->mc_dbi;
|
|
cdst->mc_db = csrc->mc_db;
|
|
cdst->mc_dbx = csrc->mc_dbx;
|
|
cdst->mc_snum = csrc->mc_snum;
|
|
cdst->mc_top = csrc->mc_top;
|
|
cdst->mc_flags = csrc->mc_flags;
|
|
|
|
for (i=0; i<csrc->mc_snum; i++) {
|
|
cdst->mc_pg[i] = csrc->mc_pg[i];
|
|
cdst->mc_ki[i] = csrc->mc_ki[i];
|
|
}
|
|
}
|
|
|
|
/** Rebalance the tree after a delete operation.
|
|
* @param[in] mc Cursor pointing to the page where rebalancing
|
|
* should begin.
|
|
* @return 0 on success, non-zero on failure.
|
|
*/
|
|
static int
|
|
mdb_rebalance(MDB_cursor *mc)
|
|
{
|
|
MDB_node *node;
|
|
int rc;
|
|
unsigned int ptop, minkeys;
|
|
MDB_cursor mn;
|
|
|
|
minkeys = 1 + (IS_BRANCH(mc->mc_pg[mc->mc_top]));
|
|
#if MDB_DEBUG
|
|
{
|
|
pgno_t pgno;
|
|
COPY_PGNO(pgno, mc->mc_pg[mc->mc_top]->mp_pgno);
|
|
DPRINTF(("rebalancing %s page %"Z"u (has %u keys, %.1f%% full)",
|
|
IS_LEAF(mc->mc_pg[mc->mc_top]) ? "leaf" : "branch",
|
|
pgno, NUMKEYS(mc->mc_pg[mc->mc_top]),
|
|
(float)PAGEFILL(mc->mc_txn->mt_env, mc->mc_pg[mc->mc_top]) / 10));
|
|
}
|
|
#endif
|
|
|
|
if (PAGEFILL(mc->mc_txn->mt_env, mc->mc_pg[mc->mc_top]) >= FILL_THRESHOLD &&
|
|
NUMKEYS(mc->mc_pg[mc->mc_top]) >= minkeys) {
|
|
#if MDB_DEBUG
|
|
pgno_t pgno;
|
|
COPY_PGNO(pgno, mc->mc_pg[mc->mc_top]->mp_pgno);
|
|
DPRINTF(("no need to rebalance page %"Z"u, above fill threshold",
|
|
pgno));
|
|
#endif
|
|
return MDB_SUCCESS;
|
|
}
|
|
|
|
if (mc->mc_snum < 2) {
|
|
MDB_page *mp = mc->mc_pg[0];
|
|
if (IS_SUBP(mp)) {
|
|
DPUTS("Can't rebalance a subpage, ignoring");
|
|
return MDB_SUCCESS;
|
|
}
|
|
if (NUMKEYS(mp) == 0) {
|
|
DPUTS("tree is completely empty");
|
|
mc->mc_db->md_root = P_INVALID;
|
|
mc->mc_db->md_depth = 0;
|
|
mc->mc_db->md_leaf_pages = 0;
|
|
rc = mdb_midl_append(&mc->mc_txn->mt_free_pgs, mp->mp_pgno);
|
|
if (rc)
|
|
return rc;
|
|
/* Adjust cursors pointing to mp */
|
|
mc->mc_snum = 0;
|
|
mc->mc_top = 0;
|
|
{
|
|
MDB_cursor *m2, *m3;
|
|
MDB_dbi dbi = mc->mc_dbi;
|
|
|
|
for (m2 = mc->mc_txn->mt_cursors[dbi]; m2; m2=m2->mc_next) {
|
|
if (mc->mc_flags & C_SUB)
|
|
m3 = &m2->mc_xcursor->mx_cursor;
|
|
else
|
|
m3 = m2;
|
|
if (m3->mc_snum < mc->mc_snum) continue;
|
|
if (m3->mc_pg[0] == mp) {
|
|
m3->mc_snum = 0;
|
|
m3->mc_top = 0;
|
|
}
|
|
}
|
|
}
|
|
} else if (IS_BRANCH(mp) && NUMKEYS(mp) == 1) {
|
|
DPUTS("collapsing root page!");
|
|
rc = mdb_midl_append(&mc->mc_txn->mt_free_pgs, mp->mp_pgno);
|
|
if (rc)
|
|
return rc;
|
|
mc->mc_db->md_root = NODEPGNO(NODEPTR(mp, 0));
|
|
rc = mdb_page_get(mc->mc_txn,mc->mc_db->md_root,&mc->mc_pg[0],NULL);
|
|
if (rc)
|
|
return rc;
|
|
mc->mc_db->md_depth--;
|
|
mc->mc_db->md_branch_pages--;
|
|
mc->mc_ki[0] = mc->mc_ki[1];
|
|
{
|
|
/* Adjust other cursors pointing to mp */
|
|
MDB_cursor *m2, *m3;
|
|
MDB_dbi dbi = mc->mc_dbi;
|
|
|
|
for (m2 = mc->mc_txn->mt_cursors[dbi]; m2; m2=m2->mc_next) {
|
|
if (mc->mc_flags & C_SUB)
|
|
m3 = &m2->mc_xcursor->mx_cursor;
|
|
else
|
|
m3 = m2;
|
|
if (m3 == mc || m3->mc_snum < mc->mc_snum) continue;
|
|
if (m3->mc_pg[0] == mp) {
|
|
m3->mc_pg[0] = mc->mc_pg[0];
|
|
m3->mc_snum = 1;
|
|
m3->mc_top = 0;
|
|
m3->mc_ki[0] = m3->mc_ki[1];
|
|
}
|
|
}
|
|
}
|
|
} else
|
|
DPUTS("root page doesn't need rebalancing");
|
|
return MDB_SUCCESS;
|
|
}
|
|
|
|
/* The parent (branch page) must have at least 2 pointers,
|
|
* otherwise the tree is invalid.
|
|
*/
|
|
ptop = mc->mc_top-1;
|
|
assert(NUMKEYS(mc->mc_pg[ptop]) > 1);
|
|
|
|
/* Leaf page fill factor is below the threshold.
|
|
* Try to move keys from left or right neighbor, or
|
|
* merge with a neighbor page.
|
|
*/
|
|
|
|
/* Find neighbors.
|
|
*/
|
|
mdb_cursor_copy(mc, &mn);
|
|
mn.mc_xcursor = NULL;
|
|
|
|
if (mc->mc_ki[ptop] == 0) {
|
|
/* We're the leftmost leaf in our parent.
|
|
*/
|
|
DPUTS("reading right neighbor");
|
|
mn.mc_ki[ptop]++;
|
|
node = NODEPTR(mc->mc_pg[ptop], mn.mc_ki[ptop]);
|
|
rc = mdb_page_get(mc->mc_txn,NODEPGNO(node),&mn.mc_pg[mn.mc_top],NULL);
|
|
if (rc)
|
|
return rc;
|
|
mn.mc_ki[mn.mc_top] = 0;
|
|
mc->mc_ki[mc->mc_top] = NUMKEYS(mc->mc_pg[mc->mc_top]);
|
|
} else {
|
|
/* There is at least one neighbor to the left.
|
|
*/
|
|
DPUTS("reading left neighbor");
|
|
mn.mc_ki[ptop]--;
|
|
node = NODEPTR(mc->mc_pg[ptop], mn.mc_ki[ptop]);
|
|
rc = mdb_page_get(mc->mc_txn,NODEPGNO(node),&mn.mc_pg[mn.mc_top],NULL);
|
|
if (rc)
|
|
return rc;
|
|
mn.mc_ki[mn.mc_top] = NUMKEYS(mn.mc_pg[mn.mc_top]) - 1;
|
|
mc->mc_ki[mc->mc_top] = 0;
|
|
}
|
|
|
|
DPRINTF(("found neighbor page %"Z"u (%u keys, %.1f%% full)",
|
|
mn.mc_pg[mn.mc_top]->mp_pgno, NUMKEYS(mn.mc_pg[mn.mc_top]),
|
|
(float)PAGEFILL(mc->mc_txn->mt_env, mn.mc_pg[mn.mc_top]) / 10));
|
|
|
|
/* If the neighbor page is above threshold and has enough keys,
|
|
* move one key from it. Otherwise we should try to merge them.
|
|
* (A branch page must never have less than 2 keys.)
|
|
*/
|
|
minkeys = 1 + (IS_BRANCH(mn.mc_pg[mn.mc_top]));
|
|
if (PAGEFILL(mc->mc_txn->mt_env, mn.mc_pg[mn.mc_top]) >= FILL_THRESHOLD && NUMKEYS(mn.mc_pg[mn.mc_top]) > minkeys)
|
|
return mdb_node_move(&mn, mc);
|
|
else {
|
|
if (mc->mc_ki[ptop] == 0)
|
|
rc = mdb_page_merge(&mn, mc);
|
|
else {
|
|
mn.mc_ki[mn.mc_top] += mc->mc_ki[mn.mc_top] + 1;
|
|
rc = mdb_page_merge(mc, &mn);
|
|
mdb_cursor_copy(&mn, mc);
|
|
}
|
|
mc->mc_flags &= ~(C_INITIALIZED|C_EOF);
|
|
}
|
|
return rc;
|
|
}
|
|
|
|
/** Complete a delete operation started by #mdb_cursor_del(). */
|
|
static int
|
|
mdb_cursor_del0(MDB_cursor *mc, MDB_node *leaf)
|
|
{
|
|
int rc;
|
|
MDB_page *mp;
|
|
indx_t ki;
|
|
unsigned int nkeys;
|
|
|
|
mp = mc->mc_pg[mc->mc_top];
|
|
ki = mc->mc_ki[mc->mc_top];
|
|
|
|
/* add overflow pages to free list */
|
|
if (!IS_LEAF2(mp) && F_ISSET(leaf->mn_flags, F_BIGDATA)) {
|
|
MDB_page *omp;
|
|
pgno_t pg;
|
|
|
|
memcpy(&pg, NODEDATA(leaf), sizeof(pg));
|
|
if ((rc = mdb_page_get(mc->mc_txn, pg, &omp, NULL)) ||
|
|
(rc = mdb_ovpage_free(mc, omp)))
|
|
return rc;
|
|
}
|
|
mdb_node_del(mp, ki, mc->mc_db->md_pad);
|
|
mc->mc_db->md_entries--;
|
|
rc = mdb_rebalance(mc);
|
|
if (rc != MDB_SUCCESS)
|
|
mc->mc_txn->mt_flags |= MDB_TXN_ERROR;
|
|
else {
|
|
MDB_cursor *m2;
|
|
MDB_dbi dbi = mc->mc_dbi;
|
|
|
|
mp = mc->mc_pg[mc->mc_top];
|
|
nkeys = NUMKEYS(mp);
|
|
|
|
/* if mc points past last node in page, find next sibling */
|
|
if (mc->mc_ki[mc->mc_top] >= nkeys)
|
|
mdb_cursor_sibling(mc, 1);
|
|
|
|
/* Adjust other cursors pointing to mp */
|
|
for (m2 = mc->mc_txn->mt_cursors[dbi]; m2; m2=m2->mc_next) {
|
|
if (m2 == mc)
|
|
continue;
|
|
if (!(m2->mc_flags & C_INITIALIZED))
|
|
continue;
|
|
if (m2->mc_pg[mc->mc_top] == mp) {
|
|
if (m2->mc_ki[mc->mc_top] >= ki) {
|
|
m2->mc_flags |= C_DEL;
|
|
if (m2->mc_ki[mc->mc_top] > ki)
|
|
m2->mc_ki[mc->mc_top]--;
|
|
}
|
|
if (m2->mc_ki[mc->mc_top] >= nkeys)
|
|
mdb_cursor_sibling(m2, 1);
|
|
}
|
|
}
|
|
mc->mc_flags |= C_DEL;
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
int
|
|
mdb_del(MDB_txn *txn, MDB_dbi dbi,
|
|
MDB_val *key, MDB_val *data)
|
|
{
|
|
MDB_cursor mc;
|
|
MDB_xcursor mx;
|
|
MDB_cursor_op op;
|
|
MDB_val rdata, *xdata;
|
|
int rc, exact;
|
|
DKBUF;
|
|
|
|
assert(key != NULL);
|
|
|
|
DPRINTF(("====> delete db %u key [%s]", dbi, DKEY(key)));
|
|
|
|
if (txn == NULL || !dbi || dbi >= txn->mt_numdbs || !(txn->mt_dbflags[dbi] & DB_VALID))
|
|
return EINVAL;
|
|
|
|
if (txn->mt_flags & (MDB_TXN_RDONLY|MDB_TXN_ERROR))
|
|
return (txn->mt_flags & MDB_TXN_RDONLY) ? EACCES : MDB_BAD_TXN;
|
|
|
|
if (key->mv_size > MDB_MAXKEYSIZE) {
|
|
return MDB_BAD_VALSIZE;
|
|
}
|
|
|
|
mdb_cursor_init(&mc, txn, dbi, &mx);
|
|
|
|
exact = 0;
|
|
if (!F_ISSET(txn->mt_dbs[dbi].md_flags, MDB_DUPSORT)) {
|
|
/* must ignore any data */
|
|
data = NULL;
|
|
}
|
|
if (data) {
|
|
op = MDB_GET_BOTH;
|
|
rdata = *data;
|
|
xdata = &rdata;
|
|
} else {
|
|
op = MDB_SET;
|
|
xdata = NULL;
|
|
}
|
|
rc = mdb_cursor_set(&mc, key, xdata, op, &exact);
|
|
if (rc == 0) {
|
|
/* let mdb_page_split know about this cursor if needed:
|
|
* delete will trigger a rebalance; if it needs to move
|
|
* a node from one page to another, it will have to
|
|
* update the parent's separator key(s). If the new sepkey
|
|
* is larger than the current one, the parent page may
|
|
* run out of space, triggering a split. We need this
|
|
* cursor to be consistent until the end of the rebalance.
|
|
*/
|
|
mc.mc_flags |= C_UNTRACK;
|
|
mc.mc_next = txn->mt_cursors[dbi];
|
|
txn->mt_cursors[dbi] = &mc;
|
|
rc = mdb_cursor_del(&mc, data ? 0 : MDB_NODUPDATA);
|
|
txn->mt_cursors[dbi] = mc.mc_next;
|
|
}
|
|
return rc;
|
|
}
|
|
|
|
/** Split a page and insert a new node.
|
|
* @param[in,out] mc Cursor pointing to the page and desired insertion index.
|
|
* The cursor will be updated to point to the actual page and index where
|
|
* the node got inserted after the split.
|
|
* @param[in] newkey The key for the newly inserted node.
|
|
* @param[in] newdata The data for the newly inserted node.
|
|
* @param[in] newpgno The page number, if the new node is a branch node.
|
|
* @param[in] nflags The #NODE_ADD_FLAGS for the new node.
|
|
* @return 0 on success, non-zero on failure.
|
|
*/
|
|
static int
|
|
mdb_page_split(MDB_cursor *mc, MDB_val *newkey, MDB_val *newdata, pgno_t newpgno,
|
|
unsigned int nflags)
|
|
{
|
|
unsigned int flags;
|
|
int rc = MDB_SUCCESS, ins_new = 0, new_root = 0, newpos = 1, did_split = 0;
|
|
indx_t newindx;
|
|
pgno_t pgno = 0;
|
|
unsigned int i, j, split_indx, nkeys, pmax;
|
|
MDB_node *node;
|
|
MDB_val sepkey, rkey, xdata, *rdata = &xdata;
|
|
MDB_page *copy;
|
|
MDB_page *mp, *rp, *pp;
|
|
unsigned int ptop;
|
|
MDB_cursor mn;
|
|
DKBUF;
|
|
|
|
mp = mc->mc_pg[mc->mc_top];
|
|
newindx = mc->mc_ki[mc->mc_top];
|
|
|
|
DPRINTF(("-----> splitting %s page %"Z"u and adding [%s] at index %i",
|
|
IS_LEAF(mp) ? "leaf" : "branch", mp->mp_pgno,
|
|
DKEY(newkey), mc->mc_ki[mc->mc_top]));
|
|
|
|
/* Create a right sibling. */
|
|
if ((rc = mdb_page_new(mc, mp->mp_flags, 1, &rp)))
|
|
return rc;
|
|
DPRINTF(("new right sibling: page %"Z"u", rp->mp_pgno));
|
|
|
|
if (mc->mc_snum < 2) {
|
|
if ((rc = mdb_page_new(mc, P_BRANCH, 1, &pp)))
|
|
return rc;
|
|
/* shift current top to make room for new parent */
|
|
mc->mc_pg[1] = mc->mc_pg[0];
|
|
mc->mc_ki[1] = mc->mc_ki[0];
|
|
mc->mc_pg[0] = pp;
|
|
mc->mc_ki[0] = 0;
|
|
mc->mc_db->md_root = pp->mp_pgno;
|
|
DPRINTF(("root split! new root = %"Z"u", pp->mp_pgno));
|
|
mc->mc_db->md_depth++;
|
|
new_root = 1;
|
|
|
|
/* Add left (implicit) pointer. */
|
|
if ((rc = mdb_node_add(mc, 0, NULL, NULL, mp->mp_pgno, 0)) != MDB_SUCCESS) {
|
|
/* undo the pre-push */
|
|
mc->mc_pg[0] = mc->mc_pg[1];
|
|
mc->mc_ki[0] = mc->mc_ki[1];
|
|
mc->mc_db->md_root = mp->mp_pgno;
|
|
mc->mc_db->md_depth--;
|
|
return rc;
|
|
}
|
|
mc->mc_snum = 2;
|
|
mc->mc_top = 1;
|
|
ptop = 0;
|
|
} else {
|
|
ptop = mc->mc_top-1;
|
|
DPRINTF(("parent branch page is %"Z"u", mc->mc_pg[ptop]->mp_pgno));
|
|
}
|
|
|
|
mc->mc_flags |= C_SPLITTING;
|
|
mdb_cursor_copy(mc, &mn);
|
|
mn.mc_pg[mn.mc_top] = rp;
|
|
mn.mc_ki[ptop] = mc->mc_ki[ptop]+1;
|
|
|
|
if (nflags & MDB_APPEND) {
|
|
mn.mc_ki[mn.mc_top] = 0;
|
|
sepkey = *newkey;
|
|
split_indx = newindx;
|
|
nkeys = 0;
|
|
goto newsep;
|
|
}
|
|
|
|
nkeys = NUMKEYS(mp);
|
|
split_indx = nkeys / 2;
|
|
if (newindx < split_indx)
|
|
newpos = 0;
|
|
|
|
if (IS_LEAF2(rp)) {
|
|
char *split, *ins;
|
|
int x;
|
|
unsigned int lsize, rsize, ksize;
|
|
/* Move half of the keys to the right sibling */
|
|
copy = NULL;
|
|
x = mc->mc_ki[mc->mc_top] - split_indx;
|
|
ksize = mc->mc_db->md_pad;
|
|
split = LEAF2KEY(mp, split_indx, ksize);
|
|
rsize = (nkeys - split_indx) * ksize;
|
|
lsize = (nkeys - split_indx) * sizeof(indx_t);
|
|
mp->mp_lower -= lsize;
|
|
rp->mp_lower += lsize;
|
|
mp->mp_upper += rsize - lsize;
|
|
rp->mp_upper -= rsize - lsize;
|
|
sepkey.mv_size = ksize;
|
|
if (newindx == split_indx) {
|
|
sepkey.mv_data = newkey->mv_data;
|
|
} else {
|
|
sepkey.mv_data = split;
|
|
}
|
|
if (x<0) {
|
|
ins = LEAF2KEY(mp, mc->mc_ki[mc->mc_top], ksize);
|
|
memcpy(rp->mp_ptrs, split, rsize);
|
|
sepkey.mv_data = rp->mp_ptrs;
|
|
memmove(ins+ksize, ins, (split_indx - mc->mc_ki[mc->mc_top]) * ksize);
|
|
memcpy(ins, newkey->mv_data, ksize);
|
|
mp->mp_lower += sizeof(indx_t);
|
|
mp->mp_upper -= ksize - sizeof(indx_t);
|
|
} else {
|
|
if (x)
|
|
memcpy(rp->mp_ptrs, split, x * ksize);
|
|
ins = LEAF2KEY(rp, x, ksize);
|
|
memcpy(ins, newkey->mv_data, ksize);
|
|
memcpy(ins+ksize, split + x * ksize, rsize - x * ksize);
|
|
rp->mp_lower += sizeof(indx_t);
|
|
rp->mp_upper -= ksize - sizeof(indx_t);
|
|
mc->mc_ki[mc->mc_top] = x;
|
|
mc->mc_pg[mc->mc_top] = rp;
|
|
}
|
|
goto newsep;
|
|
}
|
|
|
|
/* For leaf pages, check the split point based on what
|
|
* fits where, since otherwise mdb_node_add can fail.
|
|
*
|
|
* This check is only needed when the data items are
|
|
* relatively large, such that being off by one will
|
|
* make the difference between success or failure.
|
|
*
|
|
* It's also relevant if a page happens to be laid out
|
|
* such that one half of its nodes are all "small" and
|
|
* the other half of its nodes are "large." If the new
|
|
* item is also "large" and falls on the half with
|
|
* "large" nodes, it also may not fit.
|
|
*/
|
|
if (IS_LEAF(mp)) {
|
|
unsigned int psize, nsize;
|
|
/* Maximum free space in an empty page */
|
|
pmax = mc->mc_txn->mt_env->me_psize - PAGEHDRSZ;
|
|
nsize = mdb_leaf_size(mc->mc_txn->mt_env, newkey, newdata);
|
|
if ((nkeys < 20) || (nsize > pmax/16)) {
|
|
if (newindx <= split_indx) {
|
|
psize = nsize;
|
|
newpos = 0;
|
|
for (i=0; i<split_indx; i++) {
|
|
node = NODEPTR(mp, i);
|
|
psize += NODESIZE + NODEKSZ(node) + sizeof(indx_t);
|
|
if (F_ISSET(node->mn_flags, F_BIGDATA))
|
|
psize += sizeof(pgno_t);
|
|
else
|
|
psize += NODEDSZ(node);
|
|
psize += psize & 1;
|
|
if (psize > pmax) {
|
|
if (i <= newindx) {
|
|
split_indx = newindx;
|
|
if (i < newindx)
|
|
newpos = 1;
|
|
}
|
|
else
|
|
split_indx = i;
|
|
break;
|
|
}
|
|
}
|
|
} else {
|
|
psize = nsize;
|
|
for (i=nkeys-1; i>=split_indx; i--) {
|
|
node = NODEPTR(mp, i);
|
|
psize += NODESIZE + NODEKSZ(node) + sizeof(indx_t);
|
|
if (F_ISSET(node->mn_flags, F_BIGDATA))
|
|
psize += sizeof(pgno_t);
|
|
else
|
|
psize += NODEDSZ(node);
|
|
psize += psize & 1;
|
|
if (psize > pmax) {
|
|
if (i >= newindx) {
|
|
split_indx = newindx;
|
|
newpos = 0;
|
|
} else
|
|
split_indx = i+1;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/* First find the separating key between the split pages.
|
|
* The case where newindx == split_indx is ambiguous; the
|
|
* new item could go to the new page or stay on the original
|
|
* page. If newpos == 1 it goes to the new page.
|
|
*/
|
|
if (newindx == split_indx && newpos) {
|
|
sepkey.mv_size = newkey->mv_size;
|
|
sepkey.mv_data = newkey->mv_data;
|
|
} else {
|
|
node = NODEPTR(mp, split_indx);
|
|
sepkey.mv_size = node->mn_ksize;
|
|
sepkey.mv_data = NODEKEY(node);
|
|
}
|
|
|
|
newsep:
|
|
DPRINTF(("separator is [%s]", DKEY(&sepkey)));
|
|
|
|
/* Copy separator key to the parent.
|
|
*/
|
|
if (SIZELEFT(mn.mc_pg[ptop]) < mdb_branch_size(mc->mc_txn->mt_env, &sepkey)) {
|
|
mn.mc_snum--;
|
|
mn.mc_top--;
|
|
did_split = 1;
|
|
rc = mdb_page_split(&mn, &sepkey, NULL, rp->mp_pgno, 0);
|
|
|
|
/* root split? */
|
|
if (mn.mc_snum == mc->mc_snum) {
|
|
mc->mc_pg[mc->mc_snum] = mc->mc_pg[mc->mc_top];
|
|
mc->mc_ki[mc->mc_snum] = mc->mc_ki[mc->mc_top];
|
|
mc->mc_pg[mc->mc_top] = mc->mc_pg[ptop];
|
|
mc->mc_ki[mc->mc_top] = mc->mc_ki[ptop];
|
|
mc->mc_snum++;
|
|
mc->mc_top++;
|
|
ptop++;
|
|
}
|
|
/* Right page might now have changed parent.
|
|
* Check if left page also changed parent.
|
|
*/
|
|
if (mn.mc_pg[ptop] != mc->mc_pg[ptop] &&
|
|
mc->mc_ki[ptop] >= NUMKEYS(mc->mc_pg[ptop])) {
|
|
for (i=0; i<ptop; i++) {
|
|
mc->mc_pg[i] = mn.mc_pg[i];
|
|
mc->mc_ki[i] = mn.mc_ki[i];
|
|
}
|
|
mc->mc_pg[ptop] = mn.mc_pg[ptop];
|
|
mc->mc_ki[ptop] = mn.mc_ki[ptop] - 1;
|
|
}
|
|
} else {
|
|
mn.mc_top--;
|
|
rc = mdb_node_add(&mn, mn.mc_ki[ptop], &sepkey, NULL, rp->mp_pgno, 0);
|
|
mn.mc_top++;
|
|
}
|
|
mc->mc_flags ^= C_SPLITTING;
|
|
if (rc != MDB_SUCCESS) {
|
|
return rc;
|
|
}
|
|
if (nflags & MDB_APPEND) {
|
|
mc->mc_pg[mc->mc_top] = rp;
|
|
mc->mc_ki[mc->mc_top] = 0;
|
|
rc = mdb_node_add(mc, 0, newkey, newdata, newpgno, nflags);
|
|
if (rc)
|
|
return rc;
|
|
for (i=0; i<mc->mc_top; i++)
|
|
mc->mc_ki[i] = mn.mc_ki[i];
|
|
goto done;
|
|
}
|
|
if (IS_LEAF2(rp)) {
|
|
goto done;
|
|
}
|
|
|
|
/* Move half of the keys to the right sibling. */
|
|
|
|
/* grab a page to hold a temporary copy */
|
|
copy = mdb_page_malloc(mc->mc_txn, 1);
|
|
if (copy == NULL)
|
|
return ENOMEM;
|
|
|
|
copy->mp_pgno = mp->mp_pgno;
|
|
copy->mp_flags = mp->mp_flags;
|
|
copy->mp_lower = PAGEHDRSZ;
|
|
copy->mp_upper = mc->mc_txn->mt_env->me_psize;
|
|
mc->mc_pg[mc->mc_top] = copy;
|
|
for (i = j = 0; i <= nkeys; j++) {
|
|
if (i == split_indx) {
|
|
/* Insert in right sibling. */
|
|
/* Reset insert index for right sibling. */
|
|
if (i != newindx || (newpos ^ ins_new)) {
|
|
j = 0;
|
|
mc->mc_pg[mc->mc_top] = rp;
|
|
}
|
|
}
|
|
|
|
if (i == newindx && !ins_new) {
|
|
/* Insert the original entry that caused the split. */
|
|
rkey.mv_data = newkey->mv_data;
|
|
rkey.mv_size = newkey->mv_size;
|
|
if (IS_LEAF(mp)) {
|
|
rdata = newdata;
|
|
} else
|
|
pgno = newpgno;
|
|
flags = nflags;
|
|
|
|
ins_new = 1;
|
|
|
|
/* Update index for the new key. */
|
|
mc->mc_ki[mc->mc_top] = j;
|
|
} else if (i == nkeys) {
|
|
break;
|
|
} else {
|
|
node = NODEPTR(mp, i);
|
|
rkey.mv_data = NODEKEY(node);
|
|
rkey.mv_size = node->mn_ksize;
|
|
if (IS_LEAF(mp)) {
|
|
xdata.mv_data = NODEDATA(node);
|
|
xdata.mv_size = NODEDSZ(node);
|
|
rdata = &xdata;
|
|
} else
|
|
pgno = NODEPGNO(node);
|
|
flags = node->mn_flags;
|
|
|
|
i++;
|
|
}
|
|
|
|
if (!IS_LEAF(mp) && j == 0) {
|
|
/* First branch index doesn't need key data. */
|
|
rkey.mv_size = 0;
|
|
}
|
|
|
|
rc = mdb_node_add(mc, j, &rkey, rdata, pgno, flags);
|
|
if (rc) break;
|
|
}
|
|
|
|
nkeys = NUMKEYS(copy);
|
|
for (i=0; i<nkeys; i++)
|
|
mp->mp_ptrs[i] = copy->mp_ptrs[i];
|
|
mp->mp_lower = copy->mp_lower;
|
|
mp->mp_upper = copy->mp_upper;
|
|
memcpy(NODEPTR(mp, nkeys-1), NODEPTR(copy, nkeys-1),
|
|
mc->mc_txn->mt_env->me_psize - copy->mp_upper);
|
|
|
|
/* reset back to original page */
|
|
if (newindx < split_indx || (!newpos && newindx == split_indx)) {
|
|
mc->mc_pg[mc->mc_top] = mp;
|
|
if (nflags & MDB_RESERVE) {
|
|
node = NODEPTR(mp, mc->mc_ki[mc->mc_top]);
|
|
if (!(node->mn_flags & F_BIGDATA))
|
|
newdata->mv_data = NODEDATA(node);
|
|
}
|
|
} else {
|
|
mc->mc_ki[ptop]++;
|
|
/* Make sure mc_ki is still valid.
|
|
*/
|
|
if (mn.mc_pg[ptop] != mc->mc_pg[ptop] &&
|
|
mc->mc_ki[ptop] >= NUMKEYS(mc->mc_pg[ptop])) {
|
|
for (i=0; i<ptop; i++) {
|
|
mc->mc_pg[i] = mn.mc_pg[i];
|
|
mc->mc_ki[i] = mn.mc_ki[i];
|
|
}
|
|
mc->mc_pg[ptop] = mn.mc_pg[ptop];
|
|
mc->mc_ki[ptop] = mn.mc_ki[ptop] - 1;
|
|
}
|
|
}
|
|
|
|
/* return tmp page to freelist */
|
|
mdb_page_free(mc->mc_txn->mt_env, copy);
|
|
done:
|
|
{
|
|
/* Adjust other cursors pointing to mp */
|
|
MDB_cursor *m2, *m3;
|
|
MDB_dbi dbi = mc->mc_dbi;
|
|
int fixup = NUMKEYS(mp);
|
|
|
|
for (m2 = mc->mc_txn->mt_cursors[dbi]; m2; m2=m2->mc_next) {
|
|
if (mc->mc_flags & C_SUB)
|
|
m3 = &m2->mc_xcursor->mx_cursor;
|
|
else
|
|
m3 = m2;
|
|
if (m3 == mc)
|
|
continue;
|
|
if (!(m2->mc_flags & m3->mc_flags & C_INITIALIZED))
|
|
continue;
|
|
if (m3->mc_flags & C_SPLITTING)
|
|
continue;
|
|
if (new_root) {
|
|
int k;
|
|
/* root split */
|
|
for (k=m3->mc_top; k>=0; k--) {
|
|
m3->mc_ki[k+1] = m3->mc_ki[k];
|
|
m3->mc_pg[k+1] = m3->mc_pg[k];
|
|
}
|
|
if (m3->mc_ki[0] >= split_indx) {
|
|
m3->mc_ki[0] = 1;
|
|
} else {
|
|
m3->mc_ki[0] = 0;
|
|
}
|
|
m3->mc_pg[0] = mc->mc_pg[0];
|
|
m3->mc_snum++;
|
|
m3->mc_top++;
|
|
}
|
|
if (m3->mc_top >= mc->mc_top && m3->mc_pg[mc->mc_top] == mp) {
|
|
if (m3->mc_ki[mc->mc_top] >= newindx && !(nflags & MDB_SPLIT_REPLACE))
|
|
m3->mc_ki[mc->mc_top]++;
|
|
if (m3->mc_ki[mc->mc_top] >= fixup) {
|
|
m3->mc_pg[mc->mc_top] = rp;
|
|
m3->mc_ki[mc->mc_top] -= fixup;
|
|
m3->mc_ki[ptop] = mn.mc_ki[ptop];
|
|
}
|
|
} else if (!did_split && m3->mc_top >= ptop && m3->mc_pg[ptop] == mc->mc_pg[ptop] &&
|
|
m3->mc_ki[ptop] >= mc->mc_ki[ptop]) {
|
|
m3->mc_ki[ptop]++;
|
|
}
|
|
}
|
|
}
|
|
return rc;
|
|
}
|
|
|
|
int
|
|
mdb_put(MDB_txn *txn, MDB_dbi dbi,
|
|
MDB_val *key, MDB_val *data, unsigned int flags)
|
|
{
|
|
MDB_cursor mc;
|
|
MDB_xcursor mx;
|
|
|
|
assert(key != NULL);
|
|
assert(data != NULL);
|
|
|
|
if (txn == NULL || !dbi || dbi >= txn->mt_numdbs || !(txn->mt_dbflags[dbi] & DB_VALID))
|
|
return EINVAL;
|
|
|
|
if ((flags & (MDB_NOOVERWRITE|MDB_NODUPDATA|MDB_RESERVE|MDB_APPEND|MDB_APPENDDUP)) != flags)
|
|
return EINVAL;
|
|
|
|
mdb_cursor_init(&mc, txn, dbi, &mx);
|
|
return mdb_cursor_put(&mc, key, data, flags);
|
|
}
|
|
|
|
int
|
|
mdb_env_set_flags(MDB_env *env, unsigned int flag, int onoff)
|
|
{
|
|
if ((flag & CHANGEABLE) != flag)
|
|
return EINVAL;
|
|
if (onoff)
|
|
env->me_flags |= flag;
|
|
else
|
|
env->me_flags &= ~flag;
|
|
return MDB_SUCCESS;
|
|
}
|
|
|
|
int
|
|
mdb_env_get_flags(MDB_env *env, unsigned int *arg)
|
|
{
|
|
if (!env || !arg)
|
|
return EINVAL;
|
|
|
|
*arg = env->me_flags;
|
|
return MDB_SUCCESS;
|
|
}
|
|
|
|
int
|
|
mdb_env_get_path(MDB_env *env, const char **arg)
|
|
{
|
|
if (!env || !arg)
|
|
return EINVAL;
|
|
|
|
*arg = env->me_path;
|
|
return MDB_SUCCESS;
|
|
}
|
|
|
|
/** Common code for #mdb_stat() and #mdb_env_stat().
|
|
* @param[in] env the environment to operate in.
|
|
* @param[in] db the #MDB_db record containing the stats to return.
|
|
* @param[out] arg the address of an #MDB_stat structure to receive the stats.
|
|
* @return 0, this function always succeeds.
|
|
*/
|
|
static int
|
|
mdb_stat0(MDB_env *env, MDB_db *db, MDB_stat *arg)
|
|
{
|
|
arg->ms_psize = env->me_psize;
|
|
arg->ms_depth = db->md_depth;
|
|
arg->ms_branch_pages = db->md_branch_pages;
|
|
arg->ms_leaf_pages = db->md_leaf_pages;
|
|
arg->ms_overflow_pages = db->md_overflow_pages;
|
|
arg->ms_entries = db->md_entries;
|
|
|
|
return MDB_SUCCESS;
|
|
}
|
|
int
|
|
mdb_env_stat(MDB_env *env, MDB_stat *arg)
|
|
{
|
|
int toggle;
|
|
|
|
if (env == NULL || arg == NULL)
|
|
return EINVAL;
|
|
|
|
toggle = mdb_env_pick_meta(env);
|
|
|
|
return mdb_stat0(env, &env->me_metas[toggle]->mm_dbs[MAIN_DBI], arg);
|
|
}
|
|
|
|
int
|
|
mdb_env_info(MDB_env *env, MDB_envinfo *arg)
|
|
{
|
|
int toggle;
|
|
|
|
if (env == NULL || arg == NULL)
|
|
return EINVAL;
|
|
|
|
toggle = mdb_env_pick_meta(env);
|
|
arg->me_mapaddr = (env->me_flags & MDB_FIXEDMAP) ? env->me_map : 0;
|
|
arg->me_mapsize = env->me_mapsize;
|
|
arg->me_maxreaders = env->me_maxreaders;
|
|
|
|
/* me_numreaders may be zero if this process never used any readers. Use
|
|
* the shared numreader count if it exists.
|
|
*/
|
|
arg->me_numreaders = env->me_txns ? env->me_txns->mti_numreaders : env->me_numreaders;
|
|
|
|
arg->me_last_pgno = env->me_metas[toggle]->mm_last_pg;
|
|
arg->me_last_txnid = env->me_metas[toggle]->mm_txnid;
|
|
return MDB_SUCCESS;
|
|
}
|
|
|
|
/** Set the default comparison functions for a database.
|
|
* Called immediately after a database is opened to set the defaults.
|
|
* The user can then override them with #mdb_set_compare() or
|
|
* #mdb_set_dupsort().
|
|
* @param[in] txn A transaction handle returned by #mdb_txn_begin()
|
|
* @param[in] dbi A database handle returned by #mdb_dbi_open()
|
|
*/
|
|
static void
|
|
mdb_default_cmp(MDB_txn *txn, MDB_dbi dbi)
|
|
{
|
|
uint16_t f = txn->mt_dbs[dbi].md_flags;
|
|
|
|
txn->mt_dbxs[dbi].md_cmp =
|
|
(f & MDB_REVERSEKEY) ? mdb_cmp_memnr :
|
|
(f & MDB_INTEGERKEY) ? mdb_cmp_cint : mdb_cmp_memn;
|
|
|
|
txn->mt_dbxs[dbi].md_dcmp =
|
|
!(f & MDB_DUPSORT) ? 0 :
|
|
((f & MDB_INTEGERDUP)
|
|
? ((f & MDB_DUPFIXED) ? mdb_cmp_int : mdb_cmp_cint)
|
|
: ((f & MDB_REVERSEDUP) ? mdb_cmp_memnr : mdb_cmp_memn));
|
|
}
|
|
|
|
int mdb_dbi_open(MDB_txn *txn, const char *name, unsigned int flags, MDB_dbi *dbi)
|
|
{
|
|
MDB_val key, data;
|
|
MDB_dbi i;
|
|
MDB_cursor mc;
|
|
int rc, dbflag, exact;
|
|
unsigned int unused = 0;
|
|
size_t len;
|
|
|
|
if (txn->mt_dbxs[FREE_DBI].md_cmp == NULL) {
|
|
mdb_default_cmp(txn, FREE_DBI);
|
|
}
|
|
|
|
if ((flags & VALID_FLAGS) != flags)
|
|
return EINVAL;
|
|
if (txn->mt_flags & MDB_TXN_ERROR)
|
|
return MDB_BAD_TXN;
|
|
|
|
/* main DB? */
|
|
if (!name) {
|
|
*dbi = MAIN_DBI;
|
|
if (flags & PERSISTENT_FLAGS) {
|
|
uint16_t f2 = flags & PERSISTENT_FLAGS;
|
|
/* make sure flag changes get committed */
|
|
if ((txn->mt_dbs[MAIN_DBI].md_flags | f2) != txn->mt_dbs[MAIN_DBI].md_flags) {
|
|
txn->mt_dbs[MAIN_DBI].md_flags |= f2;
|
|
txn->mt_flags |= MDB_TXN_DIRTY;
|
|
}
|
|
}
|
|
mdb_default_cmp(txn, MAIN_DBI);
|
|
return MDB_SUCCESS;
|
|
}
|
|
|
|
if (txn->mt_dbxs[MAIN_DBI].md_cmp == NULL) {
|
|
mdb_default_cmp(txn, MAIN_DBI);
|
|
}
|
|
|
|
/* Is the DB already open? */
|
|
len = strlen(name);
|
|
for (i=2; i<txn->mt_numdbs; i++) {
|
|
if (!txn->mt_dbxs[i].md_name.mv_size) {
|
|
/* Remember this free slot */
|
|
if (!unused) unused = i;
|
|
continue;
|
|
}
|
|
if (len == txn->mt_dbxs[i].md_name.mv_size &&
|
|
!strncmp(name, txn->mt_dbxs[i].md_name.mv_data, len)) {
|
|
*dbi = i;
|
|
return MDB_SUCCESS;
|
|
}
|
|
}
|
|
|
|
/* If no free slot and max hit, fail */
|
|
if (!unused && txn->mt_numdbs >= txn->mt_env->me_maxdbs)
|
|
return MDB_DBS_FULL;
|
|
|
|
/* Cannot mix named databases with some mainDB flags */
|
|
if (txn->mt_dbs[MAIN_DBI].md_flags & (MDB_DUPSORT|MDB_INTEGERKEY))
|
|
return (flags & MDB_CREATE) ? MDB_INCOMPATIBLE : MDB_NOTFOUND;
|
|
|
|
/* Find the DB info */
|
|
dbflag = DB_NEW|DB_VALID;
|
|
exact = 0;
|
|
key.mv_size = len;
|
|
key.mv_data = (void *)name;
|
|
mdb_cursor_init(&mc, txn, MAIN_DBI, NULL);
|
|
rc = mdb_cursor_set(&mc, &key, &data, MDB_SET, &exact);
|
|
if (rc == MDB_SUCCESS) {
|
|
/* make sure this is actually a DB */
|
|
MDB_node *node = NODEPTR(mc.mc_pg[mc.mc_top], mc.mc_ki[mc.mc_top]);
|
|
if (!(node->mn_flags & F_SUBDATA))
|
|
return MDB_INCOMPATIBLE;
|
|
} else if (rc == MDB_NOTFOUND && (flags & MDB_CREATE)) {
|
|
/* Create if requested */
|
|
MDB_db dummy;
|
|
data.mv_size = sizeof(MDB_db);
|
|
data.mv_data = &dummy;
|
|
memset(&dummy, 0, sizeof(dummy));
|
|
dummy.md_root = P_INVALID;
|
|
dummy.md_flags = flags & PERSISTENT_FLAGS;
|
|
rc = mdb_cursor_put(&mc, &key, &data, F_SUBDATA);
|
|
dbflag |= DB_DIRTY;
|
|
}
|
|
|
|
/* OK, got info, add to table */
|
|
if (rc == MDB_SUCCESS) {
|
|
unsigned int slot = unused ? unused : txn->mt_numdbs;
|
|
txn->mt_dbxs[slot].md_name.mv_data = strdup(name);
|
|
txn->mt_dbxs[slot].md_name.mv_size = len;
|
|
txn->mt_dbxs[slot].md_rel = NULL;
|
|
txn->mt_dbflags[slot] = dbflag;
|
|
memcpy(&txn->mt_dbs[slot], data.mv_data, sizeof(MDB_db));
|
|
*dbi = slot;
|
|
mdb_default_cmp(txn, slot);
|
|
if (!unused) {
|
|
txn->mt_numdbs++;
|
|
}
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
int mdb_stat(MDB_txn *txn, MDB_dbi dbi, MDB_stat *arg)
|
|
{
|
|
if (txn == NULL || arg == NULL || dbi >= txn->mt_numdbs)
|
|
return EINVAL;
|
|
|
|
if (txn->mt_dbflags[dbi] & DB_STALE) {
|
|
MDB_cursor mc;
|
|
MDB_xcursor mx;
|
|
/* Stale, must read the DB's root. cursor_init does it for us. */
|
|
mdb_cursor_init(&mc, txn, dbi, &mx);
|
|
}
|
|
return mdb_stat0(txn->mt_env, &txn->mt_dbs[dbi], arg);
|
|
}
|
|
|
|
void mdb_dbi_close(MDB_env *env, MDB_dbi dbi)
|
|
{
|
|
char *ptr;
|
|
if (dbi <= MAIN_DBI || dbi >= env->me_maxdbs)
|
|
return;
|
|
ptr = env->me_dbxs[dbi].md_name.mv_data;
|
|
env->me_dbxs[dbi].md_name.mv_data = NULL;
|
|
env->me_dbxs[dbi].md_name.mv_size = 0;
|
|
env->me_dbflags[dbi] = 0;
|
|
free(ptr);
|
|
}
|
|
|
|
int mdb_dbi_flags(MDB_txn *txn, MDB_dbi dbi, unsigned int *flags)
|
|
{
|
|
/* We could return the flags for the FREE_DBI too but what's the point? */
|
|
if (txn == NULL || dbi < MAIN_DBI || dbi >= txn->mt_numdbs)
|
|
return EINVAL;
|
|
*flags = txn->mt_dbs[dbi].md_flags & PERSISTENT_FLAGS;
|
|
return MDB_SUCCESS;
|
|
}
|
|
|
|
/** Add all the DB's pages to the free list.
|
|
* @param[in] mc Cursor on the DB to free.
|
|
* @param[in] subs non-Zero to check for sub-DBs in this DB.
|
|
* @return 0 on success, non-zero on failure.
|
|
*/
|
|
static int
|
|
mdb_drop0(MDB_cursor *mc, int subs)
|
|
{
|
|
int rc;
|
|
|
|
rc = mdb_page_search(mc, NULL, MDB_PS_FIRST);
|
|
if (rc == MDB_SUCCESS) {
|
|
MDB_txn *txn = mc->mc_txn;
|
|
MDB_node *ni;
|
|
MDB_cursor mx;
|
|
unsigned int i;
|
|
|
|
/* LEAF2 pages have no nodes, cannot have sub-DBs */
|
|
if (IS_LEAF2(mc->mc_pg[mc->mc_top]))
|
|
mdb_cursor_pop(mc);
|
|
|
|
mdb_cursor_copy(mc, &mx);
|
|
while (mc->mc_snum > 0) {
|
|
MDB_page *mp = mc->mc_pg[mc->mc_top];
|
|
unsigned n = NUMKEYS(mp);
|
|
if (IS_LEAF(mp)) {
|
|
for (i=0; i<n; i++) {
|
|
ni = NODEPTR(mp, i);
|
|
if (ni->mn_flags & F_BIGDATA) {
|
|
MDB_page *omp;
|
|
pgno_t pg;
|
|
memcpy(&pg, NODEDATA(ni), sizeof(pg));
|
|
rc = mdb_page_get(txn, pg, &omp, NULL);
|
|
if (rc != 0)
|
|
return rc;
|
|
assert(IS_OVERFLOW(omp));
|
|
rc = mdb_midl_append_range(&txn->mt_free_pgs,
|
|
pg, omp->mp_pages);
|
|
if (rc)
|
|
return rc;
|
|
} else if (subs && (ni->mn_flags & F_SUBDATA)) {
|
|
mdb_xcursor_init1(mc, ni);
|
|
rc = mdb_drop0(&mc->mc_xcursor->mx_cursor, 0);
|
|
if (rc)
|
|
return rc;
|
|
}
|
|
}
|
|
} else {
|
|
if ((rc = mdb_midl_need(&txn->mt_free_pgs, n)) != 0)
|
|
return rc;
|
|
for (i=0; i<n; i++) {
|
|
pgno_t pg;
|
|
ni = NODEPTR(mp, i);
|
|
pg = NODEPGNO(ni);
|
|
/* free it */
|
|
mdb_midl_xappend(txn->mt_free_pgs, pg);
|
|
}
|
|
}
|
|
if (!mc->mc_top)
|
|
break;
|
|
mc->mc_ki[mc->mc_top] = i;
|
|
rc = mdb_cursor_sibling(mc, 1);
|
|
if (rc) {
|
|
/* no more siblings, go back to beginning
|
|
* of previous level.
|
|
*/
|
|
mdb_cursor_pop(mc);
|
|
mc->mc_ki[0] = 0;
|
|
for (i=1; i<mc->mc_snum; i++) {
|
|
mc->mc_ki[i] = 0;
|
|
mc->mc_pg[i] = mx.mc_pg[i];
|
|
}
|
|
}
|
|
}
|
|
/* free it */
|
|
rc = mdb_midl_append(&txn->mt_free_pgs, mc->mc_db->md_root);
|
|
} else if (rc == MDB_NOTFOUND) {
|
|
rc = MDB_SUCCESS;
|
|
}
|
|
return rc;
|
|
}
|
|
|
|
int mdb_drop(MDB_txn *txn, MDB_dbi dbi, int del)
|
|
{
|
|
MDB_cursor *mc, *m2;
|
|
int rc;
|
|
|
|
if (!txn || !dbi || dbi >= txn->mt_numdbs || (unsigned)del > 1 || !(txn->mt_dbflags[dbi] & DB_VALID))
|
|
return EINVAL;
|
|
|
|
if (F_ISSET(txn->mt_flags, MDB_TXN_RDONLY))
|
|
return EACCES;
|
|
|
|
rc = mdb_cursor_open(txn, dbi, &mc);
|
|
if (rc)
|
|
return rc;
|
|
|
|
rc = mdb_drop0(mc, mc->mc_db->md_flags & MDB_DUPSORT);
|
|
/* Invalidate the dropped DB's cursors */
|
|
for (m2 = txn->mt_cursors[dbi]; m2; m2 = m2->mc_next)
|
|
m2->mc_flags &= ~(C_INITIALIZED|C_EOF);
|
|
if (rc)
|
|
goto leave;
|
|
|
|
/* Can't delete the main DB */
|
|
if (del && dbi > MAIN_DBI) {
|
|
rc = mdb_del(txn, MAIN_DBI, &mc->mc_dbx->md_name, NULL);
|
|
if (!rc) {
|
|
txn->mt_dbflags[dbi] = DB_STALE;
|
|
mdb_dbi_close(txn->mt_env, dbi);
|
|
}
|
|
} else {
|
|
/* reset the DB record, mark it dirty */
|
|
txn->mt_dbflags[dbi] |= DB_DIRTY;
|
|
txn->mt_dbs[dbi].md_depth = 0;
|
|
txn->mt_dbs[dbi].md_branch_pages = 0;
|
|
txn->mt_dbs[dbi].md_leaf_pages = 0;
|
|
txn->mt_dbs[dbi].md_overflow_pages = 0;
|
|
txn->mt_dbs[dbi].md_entries = 0;
|
|
txn->mt_dbs[dbi].md_root = P_INVALID;
|
|
|
|
txn->mt_flags |= MDB_TXN_DIRTY;
|
|
}
|
|
leave:
|
|
mdb_cursor_close(mc);
|
|
return rc;
|
|
}
|
|
|
|
int mdb_set_compare(MDB_txn *txn, MDB_dbi dbi, MDB_cmp_func *cmp)
|
|
{
|
|
if (txn == NULL || !dbi || dbi >= txn->mt_numdbs || !(txn->mt_dbflags[dbi] & DB_VALID))
|
|
return EINVAL;
|
|
|
|
txn->mt_dbxs[dbi].md_cmp = cmp;
|
|
return MDB_SUCCESS;
|
|
}
|
|
|
|
int mdb_set_dupsort(MDB_txn *txn, MDB_dbi dbi, MDB_cmp_func *cmp)
|
|
{
|
|
if (txn == NULL || !dbi || dbi >= txn->mt_numdbs || !(txn->mt_dbflags[dbi] & DB_VALID))
|
|
return EINVAL;
|
|
|
|
txn->mt_dbxs[dbi].md_dcmp = cmp;
|
|
return MDB_SUCCESS;
|
|
}
|
|
|
|
int mdb_set_relfunc(MDB_txn *txn, MDB_dbi dbi, MDB_rel_func *rel)
|
|
{
|
|
if (txn == NULL || !dbi || dbi >= txn->mt_numdbs || !(txn->mt_dbflags[dbi] & DB_VALID))
|
|
return EINVAL;
|
|
|
|
txn->mt_dbxs[dbi].md_rel = rel;
|
|
return MDB_SUCCESS;
|
|
}
|
|
|
|
int mdb_set_relctx(MDB_txn *txn, MDB_dbi dbi, void *ctx)
|
|
{
|
|
if (txn == NULL || !dbi || dbi >= txn->mt_numdbs || !(txn->mt_dbflags[dbi] & DB_VALID))
|
|
return EINVAL;
|
|
|
|
txn->mt_dbxs[dbi].md_relctx = ctx;
|
|
return MDB_SUCCESS;
|
|
}
|
|
|
|
int mdb_env_get_maxkeysize(MDB_env *env)
|
|
{
|
|
return MDB_MAXKEYSIZE;
|
|
}
|
|
|
|
int mdb_reader_list(MDB_env *env, MDB_msg_func *func, void *ctx)
|
|
{
|
|
unsigned int i, rdrs;
|
|
MDB_reader *mr;
|
|
char buf[64];
|
|
int first = 1;
|
|
|
|
if (!env || !func)
|
|
return -1;
|
|
if (!env->me_txns) {
|
|
return func("(no reader locks)\n", ctx);
|
|
}
|
|
rdrs = env->me_txns->mti_numreaders;
|
|
mr = env->me_txns->mti_readers;
|
|
for (i=0; i<rdrs; i++) {
|
|
if (mr[i].mr_pid) {
|
|
size_t tid;
|
|
int rc;
|
|
tid = mr[i].mr_tid;
|
|
if (mr[i].mr_txnid == (txnid_t)-1) {
|
|
sprintf(buf, "%10d %"Z"x -\n", mr[i].mr_pid, tid);
|
|
} else {
|
|
sprintf(buf, "%10d %"Z"x %"Z"u\n", mr[i].mr_pid, tid, mr[i].mr_txnid);
|
|
}
|
|
if (first) {
|
|
first = 0;
|
|
func(" pid thread txnid\n", ctx);
|
|
}
|
|
rc = func(buf, ctx);
|
|
if (rc < 0)
|
|
return rc;
|
|
}
|
|
}
|
|
if (first) {
|
|
func("(no active readers)\n", ctx);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/** Insert pid into list if not already present.
|
|
* return -1 if already present.
|
|
*/
|
|
static int mdb_pid_insert(pid_t *ids, pid_t pid)
|
|
{
|
|
/* binary search of pid in list */
|
|
unsigned base = 0;
|
|
unsigned cursor = 1;
|
|
int val = 0;
|
|
unsigned n = ids[0];
|
|
|
|
while( 0 < n ) {
|
|
unsigned pivot = n >> 1;
|
|
cursor = base + pivot + 1;
|
|
val = pid - ids[cursor];
|
|
|
|
if( val < 0 ) {
|
|
n = pivot;
|
|
|
|
} else if ( val > 0 ) {
|
|
base = cursor;
|
|
n -= pivot + 1;
|
|
|
|
} else {
|
|
/* found, so it's a duplicate */
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
if( val > 0 ) {
|
|
++cursor;
|
|
}
|
|
ids[0]++;
|
|
for (n = ids[0]; n > cursor; n--)
|
|
ids[n] = ids[n-1];
|
|
ids[n] = pid;
|
|
return 0;
|
|
}
|
|
|
|
int mdb_reader_check(MDB_env *env, int *dead)
|
|
{
|
|
unsigned int i, j, rdrs;
|
|
MDB_reader *mr;
|
|
pid_t *pids, pid;
|
|
int count = 0;
|
|
|
|
if (!env)
|
|
return EINVAL;
|
|
if (dead)
|
|
*dead = 0;
|
|
if (!env->me_txns)
|
|
return MDB_SUCCESS;
|
|
rdrs = env->me_txns->mti_numreaders;
|
|
pids = malloc((rdrs+1) * sizeof(pid_t));
|
|
if (!pids)
|
|
return ENOMEM;
|
|
pids[0] = 0;
|
|
mr = env->me_txns->mti_readers;
|
|
j = 0;
|
|
for (i=0; i<rdrs; i++) {
|
|
if (mr[i].mr_pid && mr[i].mr_pid != env->me_pid) {
|
|
pid = mr[i].mr_pid;
|
|
if (mdb_pid_insert(pids, pid) == 0) {
|
|
if (!mdb_reader_pid(env, Pidcheck, pid)) {
|
|
LOCK_MUTEX_R(env);
|
|
/* Recheck, a new process may have reused pid */
|
|
if (!mdb_reader_pid(env, Pidcheck, pid)) {
|
|
for (j=i; j<rdrs; j++)
|
|
if (mr[j].mr_pid == pid) {
|
|
DPRINTF(("clear stale reader pid %u txn %"Z"d",
|
|
(unsigned) pid, mr[j].mr_txnid));
|
|
mr[j].mr_pid = 0;
|
|
count++;
|
|
}
|
|
}
|
|
UNLOCK_MUTEX_R(env);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
free(pids);
|
|
if (dead)
|
|
*dead = count;
|
|
return MDB_SUCCESS;
|
|
}
|
|
/** @} */
|
|
|