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4775 lines
128 KiB
4775 lines
128 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 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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#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 <stddef.h>
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#include <stdint.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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#ifndef _WIN32
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#include <pthread.h>
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#endif
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#include "mdb.h"
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#include "midl.h"
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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 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) *(x) = TlsAlloc()
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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)
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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 fdatasync(fd) !FlushFileBuffers(fd)
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#define ErrCode() GetLastError()
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#define GetPageSize(x) {SYSTEM_INFO si; GetSystemInfo(&si); (x) = si.dwPageSize;}
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#define close(fd) CloseHandle(fd)
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#define munmap(ptr,len) UnmapViewOfFile(ptr)
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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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/** 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 GetPageSize(x) (x) = sysconf(_SC_PAGE_SIZE)
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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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/** 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 ULONG pgno_t;
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/** @defgroup debug Debug Macros
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* @{
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*/
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#ifndef DEBUG
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/** Enable debug output.
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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 DEBUG 0
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#endif
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#if !(__STDC_VERSION__ >= 199901L || defined(__GNUC__))
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# define DPRINTF (void) /* Vararg macros may be unsupported */
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#elif DEBUG
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/** Print a debug message with printf formatting. */
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# define DPRINTF(fmt, ...) /**< Requires 2 or more args */ \
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fprintf(stderr, "%s:%d:(%p) " fmt "\n", __func__, __LINE__, pthread_self(), __VA_ARGS__)
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#else
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# define DPRINTF(fmt, ...) ((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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/** @} */
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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 #GetPageSize() 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 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 file format. */
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#define MDB_VERSION 1
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/** The maximum size of a key in the database.
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* While data items have essentially unbounded size, we require that
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* keys all fit onto a regular page. This limit could be raised a bit
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* further if needed; to something just under #PAGESIZE / #MDB_MINKEYS.
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*/
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#define MAXKEYSIZE 511
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#if 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[(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)
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#endif
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/** @defgroup lazylock Lazy Locking
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* Macros for locks that are't actually needed.
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* The DB view is always consistent because all writes are wrapped in
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* the wmutex. Finer-grained locks aren't necessary.
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* @{
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*/
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#ifndef LAZY_LOCKS
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/** Use lazy locking. I.e., don't lock these accesses at all. */
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#define LAZY_LOCKS 1
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#endif
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#if LAZY_LOCKS
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/** Grab the reader lock */
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#define LAZY_MUTEX_LOCK(x)
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/** Release the reader lock */
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#define LAZY_MUTEX_UNLOCK(x)
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/** Release the DB table reader/writer lock */
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#define LAZY_RWLOCK_UNLOCK(x)
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/** Grab the DB table write lock */
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#define LAZY_RWLOCK_WRLOCK(x)
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/** Grab the DB table read lock */
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#define LAZY_RWLOCK_RDLOCK(x)
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/** Declare the DB table rwlock */
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#define LAZY_RWLOCK_DEF(x)
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/** Initialize the DB table rwlock */
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#define LAZY_RWLOCK_INIT(x,y)
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/** Destroy the DB table rwlock */
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#define LAZY_RWLOCK_DESTROY(x)
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#else
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#define LAZY_MUTEX_LOCK(x) pthread_mutex_lock(x)
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#define LAZY_MUTEX_UNLOCK(x) pthread_mutex_unlock(x)
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#define LAZY_RWLOCK_UNLOCK(x) pthread_rwlock_unlock(x)
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#define LAZY_RWLOCK_WRLOCK(x) pthread_rwlock_wrlock(x)
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#define LAZY_RWLOCK_RDLOCK(x) pthread_rwlock_rdlock(x)
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#define LAZY_RWLOCK_DEF(x) pthread_rwlock_t x
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#define LAZY_RWLOCK_INIT(x,y) pthread_rwlock_init(x,y)
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#define LAZY_RWLOCK_DESTROY(x) pthread_rwlock_destroy(x)
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#endif
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/** @} */
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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 (~0UL)
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/** Test if a flag \b f is 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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/** 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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* 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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* @todo We don't actually do such coalescing yet, we grab pages from one
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* old transaction at a time.
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* @{
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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().
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*/
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#define DEFAULT_READERS 126
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/** The size of a CPU cache line in bytes. We want our lock structures
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* aligned to this size to avoid false cache line sharing in the
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* lock table.
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* This value works for most CPUs. For Itanium this should be 128.
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*/
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#ifndef CACHELINE
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#define CACHELINE 64
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#endif
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/** The information we store in a single slot of the reader table.
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* In addition to a transaction ID, we also record the process and
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* thread ID that owns a slot, so that we can detect stale information,
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* e.g. threads or processes that went away without cleaning up.
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* @note We currently don't check for stale records. We simply re-init
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* the table when we know that we're the only process opening the
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* lock file.
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*/
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typedef struct MDB_rxbody {
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/** The current Transaction ID when this transaction began.
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* Multiple readers that start at the same time will probably have the
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* same ID here. Again, it's not important to exclude them from
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* anything; all we need to know is which version of the DB they
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* started from so we can avoid overwriting any data used in that
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* particular version.
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*/
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ULONG mrb_txnid;
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/** The process ID of the process owning this reader txn. */
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pid_t mrb_pid;
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/** The thread ID of the thread owning this txn. */
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pthread_t mrb_tid;
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} MDB_rxbody;
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/** The actual reader record, with cacheline padding. */
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typedef struct MDB_reader {
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union {
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MDB_rxbody mrx;
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/** shorthand for mrb_txnid */
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#define mr_txnid mru.mrx.mrb_txnid
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#define mr_pid mru.mrx.mrb_pid
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#define mr_tid mru.mrx.mrb_tid
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/** cache line alignment */
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char pad[(sizeof(MDB_rxbody)+CACHELINE-1) & ~(CACHELINE-1)];
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} mru;
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} MDB_reader;
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/** The header for the reader table.
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* The table resides in a memory-mapped file. (This is a different file
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* than is used for the main database.)
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*
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* For POSIX the actual mutexes reside in the shared memory of this
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* mapped file. On Windows, mutexes are named objects allocated by the
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* kernel; we store the mutex names in this mapped file so that other
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* processes can grab them. This same approach will also be used on
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* MacOSX/Darwin (using named semaphores) since MacOSX doesn't support
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* process-shared POSIX mutexes.
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*/
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typedef struct MDB_txbody {
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/** Stamp identifying this as an MDB lock file. It must be set
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* to #MDB_MAGIC. */
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uint32_t mtb_magic;
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/** Version number of this lock file. Must be set to #MDB_VERSION. */
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uint32_t mtb_version;
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#ifdef _WIN32
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char mtb_rmname[32];
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#else
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/** Mutex protecting access to this table.
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|
* This is the reader lock that #LOCK_MUTEX_R acquires.
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*/
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pthread_mutex_t mtb_mutex;
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#endif
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/** The ID of the last transaction committed to the database.
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* This is recorded here only for convenience; the value can always
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* be determined by reading the main database meta pages.
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*/
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ULONG mtb_txnid;
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/** The number of slots that have been used in the reader table.
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* This always records the maximum count, it is not decremented
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* when readers release their slots.
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*/
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uint32_t mtb_numreaders;
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/** The ID of the most recent meta page in the database.
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* This is recorded here only for convenience; the value can always
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* be determined by reading the main database meta pages.
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*/
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uint32_t mtb_me_toggle;
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} MDB_txbody;
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|
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/** The actual reader table definition. */
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typedef struct MDB_txninfo {
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union {
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MDB_txbody mtb;
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#define mti_magic mt1.mtb.mtb_magic
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#define mti_version mt1.mtb.mtb_version
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#define mti_mutex mt1.mtb.mtb_mutex
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#define mti_rmname mt1.mtb.mtb_rmname
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#define mti_txnid mt1.mtb.mtb_txnid
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#define mti_numreaders mt1.mtb.mtb_numreaders
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#define mti_me_toggle mt1.mtb.mtb_me_toggle
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char pad[(sizeof(MDB_txbody)+CACHELINE-1) & ~(CACHELINE-1)];
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} mt1;
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union {
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#ifdef _WIN32
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|
char mt2_wmname[32];
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#define mti_wmname mt2.mt2_wmname
|
|
#else
|
|
pthread_mutex_t mt2_wmutex;
|
|
#define mti_wmutex mt2.mt2_wmutex
|
|
#endif
|
|
char pad[(sizeof(pthread_mutex_t)+CACHELINE-1) & ~(CACHELINE-1)];
|
|
} mt2;
|
|
MDB_reader mti_readers[1];
|
|
} MDB_txninfo;
|
|
/** @} */
|
|
|
|
/** Common header for all page types.
|
|
* Overflow pages 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 padded {
|
|
pgno_t p_pgno; /**< page number */
|
|
void * p_next; /**< for in-memory list of freed structs */
|
|
} mp_p;
|
|
#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 */
|
|
#define P_LEAF2 0x20 /**< for #MDB_DUPFIXED records */
|
|
uint32_t mp_flags;
|
|
#define mp_lower mp_pb.pb.pb_lower
|
|
#define mp_upper mp_pb.pb.pb_upper
|
|
#define mp_pages mp_pb.pb_pages
|
|
union page_bounds {
|
|
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)
|
|
|
|
/** 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 ignore flags)
|
|
*/
|
|
unsigned short mn_lo;
|
|
unsigned short mn_hi; /**< part of dsize or pgno */
|
|
unsigned short mn_flags; /**< flags for special node types */
|
|
#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 */
|
|
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)
|
|
|
|
/** 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 */
|
|
#if LONG_MAX == 0x7fffffff
|
|
#define NODEPGNO(node) ((node)->mn_lo | ((node)->mn_hi << 16))
|
|
/** Set the page number in a branch node */
|
|
#define SETPGNO(node,pgno) do { \
|
|
(node)->mn_lo = (pgno) & 0xffff; (node)->mn_hi = (pgno) >> 16;} while(0)
|
|
#else
|
|
#define NODEPGNO(node) ((node)->mn_lo | ((node)->mn_hi << 16) | ((unsigned long)(node)->mn_flags << 32))
|
|
/** Set the page number in a branch node */
|
|
#define SETPGNO(node,pgno) do { \
|
|
(node)->mn_lo = (pgno) & 0xffff; (node)->mn_hi = (pgno) >> 16; \
|
|
(node)->mn_flags = (pgno) >> 32; } while(0)
|
|
#endif
|
|
|
|
/** 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)
|
|
|
|
/** 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 key, if requested. */
|
|
#define MDB_SET_KEY(node, key) if (key!=NULL) {(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_open */
|
|
uint16_t md_depth; /**< depth of this tree */
|
|
ULONG md_branch_pages; /**< number of internal pages */
|
|
ULONG md_leaf_pages; /**< number of leaf pages */
|
|
ULONG md_overflow_pages; /**< number of overflow pages */
|
|
ULONG md_entries; /**< number of data items */
|
|
pgno_t md_root; /**< the root page of this tree */
|
|
} MDB_db;
|
|
|
|
/** 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. */
|
|
typedef struct MDB_meta {
|
|
/** Stamp identifying this as an MDB data file. It must be set
|
|
* to #MDB_MAGIC. */
|
|
uint32_t mm_magic;
|
|
/** Version number of this lock file. Must be set to #MDB_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 */
|
|
ULONG mm_txnid; /**< txnid that committed this page */
|
|
} MDB_meta;
|
|
|
|
/** Auxiliary DB info.
|
|
* The information here is mostly static/read-only. There is
|
|
* only a single copy of this record in the environment.
|
|
* The \b md_dirty flag is not read-only, but only a write
|
|
* transaction can ever update it, and only write transactions
|
|
* need to worry about it.
|
|
*/
|
|
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 */
|
|
MDB_dbi md_parent; /**< parent DB of a sub-DB */
|
|
unsigned int md_dirty; /**< TRUE if DB was written in this txn */
|
|
} MDB_dbx;
|
|
|
|
/** A database transaction.
|
|
* Every operation requires a transaction handle.
|
|
*/
|
|
struct MDB_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.
|
|
*/
|
|
ULONG mt_txnid;
|
|
MDB_env *mt_env; /**< the DB environment */
|
|
/** The list of pages that became unused during this transaction.
|
|
* This is an #IDL.
|
|
*/
|
|
pgno_t *mt_free_pgs;
|
|
union {
|
|
ID2L dirty_list; /**< modified pages */
|
|
MDB_reader *reader; /**< this thread's slot in the reader table */
|
|
} 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;
|
|
/** Number of DB records in use. This number only ever increments;
|
|
* we don't decrement it when individual DB handles are closed.
|
|
*/
|
|
unsigned int mt_numdbs;
|
|
|
|
#define MDB_TXN_RDONLY 0x01 /**< read-only transaction */
|
|
#define MDB_TXN_ERROR 0x02 /**< an error has occurred */
|
|
unsigned int mt_flags;
|
|
/** Tracks which of the two meta pages was used at the start
|
|
* of this transaction.
|
|
*/
|
|
unsigned int mt_toggle;
|
|
};
|
|
|
|
/** 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 */
|
|
struct MDB_cursor {
|
|
/** 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;
|
|
unsigned short mc_snum; /**< number of pushed pages */
|
|
unsigned short mc_top; /**< index of top page, mc_snum-1 */
|
|
unsigned int mc_flags;
|
|
#define C_INITIALIZED 0x01 /**< cursor has been initialized and is valid */
|
|
#define C_EOF 0x02 /**< No more data */
|
|
#define C_XDIRTY 0x04 /**< @deprecated mc_xcursor needs to be flushed */
|
|
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;
|
|
/** A fake transaction struct for pointing to our own table
|
|
* of DB info.
|
|
*/
|
|
MDB_txn mx_txn;
|
|
/** Our private DB information tables. Slots 0 and 1 are always
|
|
* copies of the corresponding slots in the main transaction. These
|
|
* hold the FREEDB and MAINDB, respectively. If the main cursor is
|
|
* on a sub-database, that will be copied to slot 2, and the duplicate
|
|
* database info will be in slot 3. If the main cursor is on the MAINDB
|
|
* then the duplicate DB info will be in slot 2 and slot 3 will be unused.
|
|
*/
|
|
MDB_dbx mx_dbxs[4];
|
|
/** MDB_db table */
|
|
MDB_db mx_dbs[4];
|
|
} MDB_xcursor;
|
|
|
|
/** A set of pages freed by an earlier transaction. */
|
|
typedef struct MDB_oldpages {
|
|
/** Usually we only read one record from the FREEDB at a time, but
|
|
* in case we read more, this will chain them together.
|
|
*/
|
|
struct MDB_oldpages *mo_next;
|
|
/** The ID of the transaction in which these pages were freed. */
|
|
ULONG mo_txnid;
|
|
/** An #IDL of the pages */
|
|
pgno_t mo_pages[1]; /* dynamic */
|
|
} MDB_oldpages;
|
|
|
|
/** 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
|
|
uint32_t me_flags;
|
|
uint32_t me_extrapad; /**< unused for now */
|
|
unsigned int me_maxreaders; /**< size of the reader table */
|
|
unsigned int me_numdbs; /**< number of DBs opened */
|
|
unsigned int me_maxdbs; /**< size of the DB table */
|
|
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 */
|
|
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 */
|
|
unsigned int me_psize; /**< size of a page, from #GetPageSize */
|
|
unsigned int me_db_toggle; /**< which DB table is current */
|
|
MDB_dbx *me_dbxs; /**< array of static DB info */
|
|
MDB_db *me_dbs[2]; /**< two arrays of MDB_db info */
|
|
MDB_oldpages *me_pghead; /**< list of old page records */
|
|
pthread_key_t me_txkey; /**< thread-key for readers */
|
|
MDB_page *me_dpages; /**< list of malloc'd blocks for re-use */
|
|
/** IDL of pages that became unused in a write txn */
|
|
pgno_t me_free_pgs[MDB_IDL_UM_SIZE];
|
|
/** ID2L of pages that were written during a write txn */
|
|
ID2 me_dirty_list[MDB_IDL_UM_SIZE];
|
|
/** rwlock for the DB tables, if #LAZY_LOCKS is false */
|
|
LAZY_RWLOCK_DEF(me_dblock);
|
|
#ifdef _WIN32
|
|
HANDLE me_rmutex; /* Windows mutexes don't reside in shared mem */
|
|
HANDLE me_wmutex;
|
|
#endif
|
|
};
|
|
/** max number of pages to commit in one writev() call */
|
|
#define MDB_COMMIT_PAGES 64
|
|
|
|
static MDB_page *mdb_alloc_page(MDB_cursor *mc, int num);
|
|
static int mdb_touch(MDB_cursor *mc);
|
|
|
|
static int mdb_search_page_root(MDB_cursor *mc,
|
|
MDB_val *key, int modify);
|
|
static int mdb_search_page(MDB_cursor *mc,
|
|
MDB_val *key, int modify);
|
|
|
|
static int mdb_env_read_header(MDB_env *env, MDB_meta *meta);
|
|
static int mdb_env_read_meta(MDB_env *env, int *which);
|
|
static int mdb_env_write_meta(MDB_txn *txn);
|
|
static int mdb_get_page(MDB_txn *txn, pgno_t pgno, MDB_page **mp);
|
|
|
|
static MDB_node *mdb_search_node(MDB_cursor *mc, MDB_val *key, int *exactp);
|
|
static int mdb_add_node(MDB_cursor *mc, indx_t indx,
|
|
MDB_val *key, MDB_val *data, pgno_t pgno, uint8_t flags);
|
|
static void mdb_del_node(MDB_page *mp, indx_t indx, int ksize);
|
|
static int mdb_del0(MDB_cursor *mc, MDB_node *leaf);
|
|
static int mdb_read_data(MDB_txn *txn, MDB_node *leaf, MDB_val *data);
|
|
|
|
static int mdb_rebalance(MDB_cursor *mc);
|
|
static int mdb_update_key(MDB_page *mp, indx_t indx, MDB_val *key);
|
|
static int mdb_move_node(MDB_cursor *csrc, MDB_cursor *cdst);
|
|
static int mdb_merge(MDB_cursor *csrc, MDB_cursor *cdst);
|
|
static int mdb_split(MDB_cursor *mc, MDB_val *newkey, MDB_val *newdata,
|
|
pgno_t newpgno);
|
|
static MDB_page *mdb_new_page(MDB_cursor *mc, uint32_t flags, int num);
|
|
|
|
static void cursor_pop_page(MDB_cursor *mc);
|
|
static int cursor_push_page(MDB_cursor *mc, MDB_page *mp);
|
|
|
|
static int mdb_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_xcursor_init0(MDB_cursor *mc);
|
|
static void mdb_xcursor_init1(MDB_cursor *mc, MDB_node *node);
|
|
static void mdb_xcursor_init2(MDB_cursor *mc);
|
|
static void mdb_xcursor_fini(MDB_cursor *mc);
|
|
|
|
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 void mdb_default_cmp(MDB_txn *txn, MDB_dbi dbi);
|
|
|
|
/** @cond */
|
|
static MDB_cmp_func memncmp, memnrcmp, intcmp, cintcmp;
|
|
/** @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"
|
|
};
|
|
|
|
char *
|
|
mdb_strerror(int err)
|
|
{
|
|
if (!err)
|
|
return ("Successful return: 0");
|
|
|
|
if (err >= MDB_KEYEXIST && err <= MDB_VERSION_MISMATCH)
|
|
return mdb_errstr[err - MDB_KEYEXIST];
|
|
|
|
return strerror(err);
|
|
}
|
|
|
|
#if 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->mv_size > MAXKEYSIZE)
|
|
return "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
|
|
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;
|
|
}
|
|
#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);
|
|
}
|
|
|
|
/** Compare two data items according to a particular database.
|
|
* This returns a comparison as if the two items were data items of
|
|
* a sorted duplicates #MDB_DUPSORT database.
|
|
* @param[in] txn A transaction handle returned by #mdb_txn_begin()
|
|
* @param[in] dbi A database handle returned by #mdb_open()
|
|
* @param[in] a The first item to compare
|
|
* @param[in] b The second item to compare
|
|
* @return < 0 if a < b, 0 if a == b, > 0 if a > b
|
|
*/
|
|
int
|
|
mdb_dcmp(MDB_txn *txn, MDB_dbi dbi, const MDB_val *a, const MDB_val *b)
|
|
{
|
|
if (txn->mt_dbxs[dbi].md_dcmp)
|
|
return txn->mt_dbxs[dbi].md_dcmp(a, b);
|
|
else
|
|
return EINVAL; /* too bad you can't distinguish this from a valid result */
|
|
}
|
|
|
|
/** Allocate pages for writing.
|
|
* If there are free pages available from older transactions, they
|
|
* will be re-used first. Otherwise a new page will be allocated.
|
|
* @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.
|
|
* @return Address of the allocated page(s). Requests for multiple pages
|
|
* will always be satisfied by a single contiguous chunk of memory.
|
|
*/
|
|
static MDB_page *
|
|
mdb_alloc_page(MDB_cursor *mc, int num)
|
|
{
|
|
MDB_txn *txn = mc->mc_txn;
|
|
MDB_page *np;
|
|
pgno_t pgno = P_INVALID;
|
|
ID2 mid;
|
|
|
|
if (txn->mt_txnid > 2) {
|
|
|
|
if (!txn->mt_env->me_pghead && mc->mc_dbi != FREE_DBI &&
|
|
txn->mt_dbs[FREE_DBI].md_root != P_INVALID) {
|
|
/* See if there's anything in the free DB */
|
|
MDB_cursor m2;
|
|
MDB_node *leaf;
|
|
ULONG *kptr, oldest;
|
|
|
|
m2.mc_txn = txn;
|
|
m2.mc_dbi = FREE_DBI;
|
|
m2.mc_snum = 0;
|
|
m2.mc_flags = 0;
|
|
mdb_search_page(&m2, NULL, 0);
|
|
leaf = NODEPTR(m2.mc_pg[m2.mc_top], 0);
|
|
kptr = (ULONG *)NODEKEY(leaf);
|
|
|
|
{
|
|
unsigned int i;
|
|
oldest = txn->mt_txnid - 1;
|
|
for (i=0; i<txn->mt_env->me_txns->mti_numreaders; i++) {
|
|
ULONG mr = txn->mt_env->me_txns->mti_readers[i].mr_txnid;
|
|
if (mr && mr < oldest)
|
|
oldest = mr;
|
|
}
|
|
}
|
|
|
|
if (oldest > *kptr) {
|
|
/* It's usable, grab it.
|
|
*/
|
|
MDB_oldpages *mop;
|
|
MDB_val data;
|
|
pgno_t *idl;
|
|
|
|
mdb_read_data(txn, leaf, &data);
|
|
idl = (ULONG *)data.mv_data;
|
|
mop = malloc(sizeof(MDB_oldpages) + MDB_IDL_SIZEOF(idl) - sizeof(pgno_t));
|
|
mop->mo_next = txn->mt_env->me_pghead;
|
|
mop->mo_txnid = *kptr;
|
|
txn->mt_env->me_pghead = mop;
|
|
memcpy(mop->mo_pages, idl, MDB_IDL_SIZEOF(idl));
|
|
|
|
#if DEBUG > 1
|
|
{
|
|
unsigned int i;
|
|
DPRINTF("IDL read txn %lu root %lu num %lu",
|
|
mop->mo_txnid, txn->mt_dbs[FREE_DBI].md_root, idl[0]);
|
|
for (i=0; i<idl[0]; i++) {
|
|
DPRINTF("IDL %lu", idl[i+1]);
|
|
}
|
|
}
|
|
#endif
|
|
/* drop this IDL from the DB */
|
|
m2.mc_ki[m2.mc_top] = 0;
|
|
m2.mc_flags = C_INITIALIZED;
|
|
mdb_cursor_del(&m2, 0);
|
|
}
|
|
}
|
|
if (txn->mt_env->me_pghead) {
|
|
MDB_oldpages *mop = txn->mt_env->me_pghead;
|
|
if (num > 1) {
|
|
/* FIXME: For now, always use fresh pages. We
|
|
* really ought to search the free list for a
|
|
* contiguous range.
|
|
*/
|
|
;
|
|
} else {
|
|
/* peel pages off tail, so we only have to truncate the list */
|
|
pgno = MDB_IDL_LAST(mop->mo_pages);
|
|
if (MDB_IDL_IS_RANGE(mop->mo_pages)) {
|
|
mop->mo_pages[2]++;
|
|
if (mop->mo_pages[2] > mop->mo_pages[1])
|
|
mop->mo_pages[0] = 0;
|
|
} else {
|
|
mop->mo_pages[0]--;
|
|
}
|
|
if (MDB_IDL_IS_ZERO(mop->mo_pages)) {
|
|
txn->mt_env->me_pghead = mop->mo_next;
|
|
free(mop);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
if (pgno == P_INVALID) {
|
|
/* DB size is maxed out */
|
|
if (txn->mt_next_pgno + num >= txn->mt_env->me_maxpg)
|
|
return NULL;
|
|
}
|
|
if (txn->mt_env->me_dpages && num == 1) {
|
|
np = txn->mt_env->me_dpages;
|
|
txn->mt_env->me_dpages = np->mp_next;
|
|
} else {
|
|
if ((np = malloc(txn->mt_env->me_psize * num )) == NULL)
|
|
return NULL;
|
|
}
|
|
if (pgno == P_INVALID) {
|
|
np->mp_pgno = txn->mt_next_pgno;
|
|
txn->mt_next_pgno += num;
|
|
} else {
|
|
np->mp_pgno = pgno;
|
|
}
|
|
mid.mid = np->mp_pgno;
|
|
mid.mptr = np;
|
|
mdb_mid2l_insert(txn->mt_u.dirty_list, &mid);
|
|
|
|
return np;
|
|
}
|
|
|
|
/** 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_touch(MDB_cursor *mc)
|
|
{
|
|
MDB_page *mp = mc->mc_pg[mc->mc_top];
|
|
pgno_t pgno;
|
|
|
|
if (!F_ISSET(mp->mp_flags, P_DIRTY)) {
|
|
MDB_page *np;
|
|
if ((np = mdb_alloc_page(mc, 1)) == NULL)
|
|
return ENOMEM;
|
|
DPRINTF("touched db %u page %lu -> %lu", mc->mc_dbi, mp->mp_pgno, np->mp_pgno);
|
|
assert(mp->mp_pgno != np->mp_pgno);
|
|
mdb_midl_append(mc->mc_txn->mt_free_pgs, mp->mp_pgno);
|
|
pgno = np->mp_pgno;
|
|
memcpy(np, mp, mc->mc_txn->mt_env->me_psize);
|
|
mp = np;
|
|
mp->mp_pgno = pgno;
|
|
mp->mp_flags |= P_DIRTY;
|
|
|
|
mc->mc_pg[mc->mc_top] = mp;
|
|
/** If this page has a parent, update the parent to point to
|
|
* this new page.
|
|
*/
|
|
if (mc->mc_top)
|
|
SETPGNO(NODEPTR(mc->mc_pg[mc->mc_top-1], mc->mc_ki[mc->mc_top-1]), mp->mp_pgno);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
mdb_env_sync(MDB_env *env, int force)
|
|
{
|
|
int rc = 0;
|
|
if (force || !F_ISSET(env->me_flags, MDB_NOSYNC)) {
|
|
if (fdatasync(env->me_fd))
|
|
rc = ErrCode();
|
|
}
|
|
return rc;
|
|
}
|
|
|
|
static inline void
|
|
mdb_txn_reset0(MDB_txn *txn);
|
|
|
|
/** 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. This can only
|
|
* fail for read-only transactions, and then only if the
|
|
* reader table is full.
|
|
*/
|
|
static inline int
|
|
mdb_txn_renew0(MDB_txn *txn)
|
|
{
|
|
MDB_env *env = txn->mt_env;
|
|
|
|
if (txn->mt_flags & MDB_TXN_RDONLY) {
|
|
MDB_reader *r = pthread_getspecific(env->me_txkey);
|
|
if (!r) {
|
|
unsigned int i;
|
|
pid_t pid = getpid();
|
|
pthread_t tid = pthread_self();
|
|
|
|
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 ENOMEM;
|
|
}
|
|
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;
|
|
UNLOCK_MUTEX_R(env);
|
|
r = &env->me_txns->mti_readers[i];
|
|
pthread_setspecific(env->me_txkey, r);
|
|
}
|
|
txn->mt_txnid = env->me_txns->mti_txnid;
|
|
txn->mt_toggle = env->me_txns->mti_me_toggle;
|
|
r->mr_txnid = txn->mt_txnid;
|
|
txn->mt_u.reader = r;
|
|
} else {
|
|
LOCK_MUTEX_W(env);
|
|
|
|
txn->mt_txnid = env->me_txns->mti_txnid+1;
|
|
txn->mt_toggle = env->me_txns->mti_me_toggle;
|
|
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_next_pgno = env->me_metas[txn->mt_toggle]->mm_last_pg+1;
|
|
env->me_txn = txn;
|
|
}
|
|
|
|
/* Copy the DB arrays */
|
|
LAZY_RWLOCK_RDLOCK(&env->me_dblock);
|
|
txn->mt_numdbs = env->me_numdbs;
|
|
txn->mt_dbxs = env->me_dbxs; /* mostly static anyway */
|
|
memcpy(txn->mt_dbs, env->me_metas[txn->mt_toggle]->mm_dbs, 2 * sizeof(MDB_db));
|
|
if (txn->mt_numdbs > 2)
|
|
memcpy(txn->mt_dbs+2, env->me_dbs[env->me_db_toggle]+2,
|
|
(txn->mt_numdbs - 2) * sizeof(MDB_db));
|
|
LAZY_RWLOCK_UNLOCK(&env->me_dblock);
|
|
|
|
return MDB_SUCCESS;
|
|
}
|
|
|
|
int
|
|
mdb_txn_renew(MDB_txn *txn)
|
|
{
|
|
int rc;
|
|
|
|
if (!txn)
|
|
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 %lu%c %p on mdbenv %p, root page %lu",
|
|
txn->mt_txnid, (txn->mt_flags & MDB_TXN_RDONLY) ? 'r' : 'w', txn,
|
|
(void *)txn->mt_env, txn->mt_dbs[MAIN_DBI].md_root);
|
|
}
|
|
return rc;
|
|
}
|
|
|
|
int
|
|
mdb_txn_begin(MDB_env *env, unsigned int flags, MDB_txn **ret)
|
|
{
|
|
MDB_txn *txn;
|
|
int rc;
|
|
|
|
if (env->me_flags & MDB_FATAL_ERROR) {
|
|
DPUTS("environment had fatal error, must shutdown!");
|
|
return MDB_PANIC;
|
|
}
|
|
if ((txn = calloc(1, sizeof(MDB_txn) + env->me_maxdbs * sizeof(MDB_db))) == NULL) {
|
|
DPRINTF("calloc: %s", strerror(ErrCode()));
|
|
return ENOMEM;
|
|
}
|
|
txn->mt_dbs = (MDB_db *)(txn+1);
|
|
if (flags & MDB_RDONLY) {
|
|
txn->mt_flags |= MDB_TXN_RDONLY;
|
|
}
|
|
txn->mt_env = env;
|
|
|
|
rc = mdb_txn_renew0(txn);
|
|
if (rc)
|
|
free(txn);
|
|
else {
|
|
*ret = txn;
|
|
DPRINTF("begin txn %lu%c %p on mdbenv %p, root page %lu",
|
|
txn->mt_txnid, (txn->mt_flags & MDB_TXN_RDONLY) ? 'r' : 'w', txn,
|
|
(void *) env, txn->mt_dbs[MAIN_DBI].md_root);
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
/** Common code for #mdb_txn_reset() and #mdb_txn_abort().
|
|
* @param[in] txn the transaction handle to reset
|
|
*/
|
|
static inline void
|
|
mdb_txn_reset0(MDB_txn *txn)
|
|
{
|
|
MDB_env *env = txn->mt_env;
|
|
|
|
if (F_ISSET(txn->mt_flags, MDB_TXN_RDONLY)) {
|
|
txn->mt_u.reader->mr_txnid = 0;
|
|
} else {
|
|
MDB_oldpages *mop;
|
|
MDB_page *dp;
|
|
unsigned int i;
|
|
|
|
/* return all dirty pages to dpage list */
|
|
for (i=1; i<=txn->mt_u.dirty_list[0].mid; i++) {
|
|
dp = txn->mt_u.dirty_list[i].mptr;
|
|
if (!IS_OVERFLOW(dp) || dp->mp_pages == 1) {
|
|
dp->mp_next = txn->mt_env->me_dpages;
|
|
txn->mt_env->me_dpages = dp;
|
|
} else {
|
|
/* large pages just get freed directly */
|
|
free(dp);
|
|
}
|
|
}
|
|
|
|
while ((mop = txn->mt_env->me_pghead)) {
|
|
txn->mt_env->me_pghead = mop->mo_next;
|
|
free(mop);
|
|
}
|
|
|
|
env->me_txn = NULL;
|
|
for (i=2; i<env->me_numdbs; i++)
|
|
env->me_dbxs[i].md_dirty = 0;
|
|
/* The writer mutex was locked in mdb_txn_begin. */
|
|
UNLOCK_MUTEX_W(env);
|
|
}
|
|
}
|
|
|
|
void
|
|
mdb_txn_reset(MDB_txn *txn)
|
|
{
|
|
if (txn == NULL)
|
|
return;
|
|
|
|
DPRINTF("reset txn %lu%c %p on mdbenv %p, root page %lu",
|
|
txn->mt_txnid, (txn->mt_flags & MDB_TXN_RDONLY) ? 'r' : 'w', txn,
|
|
(void *)txn->mt_env, txn->mt_dbs[MAIN_DBI].md_root);
|
|
|
|
mdb_txn_reset0(txn);
|
|
}
|
|
|
|
void
|
|
mdb_txn_abort(MDB_txn *txn)
|
|
{
|
|
if (txn == NULL)
|
|
return;
|
|
|
|
DPRINTF("abort txn %lu%c %p on mdbenv %p, root page %lu",
|
|
txn->mt_txnid, (txn->mt_flags & MDB_TXN_RDONLY) ? 'r' : 'w', txn,
|
|
(void *)txn->mt_env, txn->mt_dbs[MAIN_DBI].md_root);
|
|
|
|
mdb_txn_reset0(txn);
|
|
free(txn);
|
|
}
|
|
|
|
int
|
|
mdb_txn_commit(MDB_txn *txn)
|
|
{
|
|
int n, done;
|
|
unsigned int i;
|
|
ssize_t rc;
|
|
off_t size;
|
|
MDB_page *dp;
|
|
MDB_env *env;
|
|
pgno_t next;
|
|
MDB_cursor mc;
|
|
|
|
assert(txn != NULL);
|
|
assert(txn->mt_env != NULL);
|
|
|
|
env = txn->mt_env;
|
|
|
|
if (F_ISSET(txn->mt_flags, MDB_TXN_RDONLY)) {
|
|
mdb_txn_abort(txn);
|
|
return MDB_SUCCESS;
|
|
}
|
|
|
|
if (txn != env->me_txn) {
|
|
DPUTS("attempt to commit unknown transaction");
|
|
mdb_txn_abort(txn);
|
|
return EINVAL;
|
|
}
|
|
|
|
if (F_ISSET(txn->mt_flags, MDB_TXN_ERROR)) {
|
|
DPUTS("error flag is set, can't commit");
|
|
mdb_txn_abort(txn);
|
|
return EINVAL;
|
|
}
|
|
|
|
if (!txn->mt_u.dirty_list[0].mid)
|
|
goto done;
|
|
|
|
DPRINTF("committing txn %lu %p on mdbenv %p, root page %lu",
|
|
txn->mt_txnid, txn, (void *)env, txn->mt_dbs[MAIN_DBI].md_root);
|
|
|
|
mc.mc_txn = txn;
|
|
mc.mc_dbi = FREE_DBI;
|
|
mc.mc_flags = 0;
|
|
|
|
/* should only be one record now */
|
|
if (env->me_pghead) {
|
|
/* make sure first page of freeDB is touched and on freelist */
|
|
mdb_search_page(&mc, NULL, 1);
|
|
}
|
|
/* save to free list */
|
|
if (!MDB_IDL_IS_ZERO(txn->mt_free_pgs)) {
|
|
MDB_val key, data;
|
|
ULONG i;
|
|
|
|
/* make sure last page of freeDB is touched and on freelist */
|
|
key.mv_size = MAXKEYSIZE+1;
|
|
key.mv_data = NULL;
|
|
mdb_search_page(&mc, &key, 1);
|
|
|
|
mdb_midl_sort(txn->mt_free_pgs);
|
|
#if DEBUG > 1
|
|
{
|
|
unsigned int i;
|
|
ULONG *idl = txn->mt_free_pgs;
|
|
DPRINTF("IDL write txn %lu root %lu num %lu",
|
|
txn->mt_txnid, txn->mt_dbs[FREE_DBI].md_root, idl[0]);
|
|
for (i=0; i<idl[0]; i++) {
|
|
DPRINTF("IDL %lu", idl[i+1]);
|
|
}
|
|
}
|
|
#endif
|
|
/* write to last page of freeDB */
|
|
key.mv_size = sizeof(pgno_t);
|
|
key.mv_data = (char *)&txn->mt_txnid;
|
|
data.mv_data = txn->mt_free_pgs;
|
|
/* The free list can still grow during this call,
|
|
* despite the pre-emptive touches above. So check
|
|
* and make sure the entire thing got written.
|
|
*/
|
|
do {
|
|
i = txn->mt_free_pgs[0];
|
|
data.mv_size = MDB_IDL_SIZEOF(txn->mt_free_pgs);
|
|
rc = mdb_cursor_put(&mc, &key, &data, 0);
|
|
if (rc) {
|
|
mdb_txn_abort(txn);
|
|
return rc;
|
|
}
|
|
} while (i != txn->mt_free_pgs[0]);
|
|
}
|
|
/* should only be one record now */
|
|
if (env->me_pghead) {
|
|
MDB_val key, data;
|
|
MDB_oldpages *mop;
|
|
|
|
mop = env->me_pghead;
|
|
key.mv_size = sizeof(pgno_t);
|
|
key.mv_data = (char *)&mop->mo_txnid;
|
|
data.mv_size = MDB_IDL_SIZEOF(mop->mo_pages);
|
|
data.mv_data = mop->mo_pages;
|
|
mdb_cursor_put(&mc, &key, &data, 0);
|
|
free(env->me_pghead);
|
|
env->me_pghead = NULL;
|
|
}
|
|
|
|
/* Update DB root pointers. Their pages have already been
|
|
* touched so this is all in-place and cannot fail.
|
|
*/
|
|
{
|
|
MDB_val data;
|
|
data.mv_size = sizeof(MDB_db);
|
|
|
|
mc.mc_dbi = MAIN_DBI;
|
|
mc.mc_flags = 0;
|
|
for (i = 2; i < txn->mt_numdbs; i++) {
|
|
if (txn->mt_dbxs[i].md_dirty) {
|
|
data.mv_data = &txn->mt_dbs[i];
|
|
mdb_cursor_put(&mc, &txn->mt_dbxs[i].md_name, &data, 0);
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Commit up to MDB_COMMIT_PAGES dirty pages to disk until done.
|
|
*/
|
|
next = 0;
|
|
i = 1;
|
|
do {
|
|
#ifdef _WIN32
|
|
/* 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.
|
|
*/
|
|
OVERLAPPED ov;
|
|
memset(&ov, 0, sizeof(ov));
|
|
for (; i<=txn->mt_u.dirty_list[0].mid; i++) {
|
|
size_t wsize;
|
|
dp = txn->mt_u.dirty_list[i].mptr;
|
|
DPRINTF("committing page %lu", dp->mp_pgno);
|
|
size = dp->mp_pgno * env->me_psize;
|
|
ov.Offset = size & 0xffffffff;
|
|
ov.OffsetHigh = size >> 16;
|
|
ov.OffsetHigh >>= 16;
|
|
/* clear dirty flag */
|
|
dp->mp_flags &= ~P_DIRTY;
|
|
wsize = env->me_psize;
|
|
if (IS_OVERFLOW(dp)) wsize *= dp->mp_pages;
|
|
rc = WriteFile(env->me_fd, dp, wsize, NULL, &ov);
|
|
if (!rc) {
|
|
n = ErrCode();
|
|
DPRINTF("WriteFile: %d", n);
|
|
mdb_txn_abort(txn);
|
|
return n;
|
|
}
|
|
}
|
|
done = 1;;
|
|
#else
|
|
struct iovec iov[MDB_COMMIT_PAGES];
|
|
n = 0;
|
|
done = 1;
|
|
size = 0;
|
|
for (; i<=txn->mt_u.dirty_list[0].mid; i++) {
|
|
dp = txn->mt_u.dirty_list[i].mptr;
|
|
if (dp->mp_pgno != next) {
|
|
if (n) {
|
|
DPRINTF("committing %u dirty pages", n);
|
|
rc = writev(env->me_fd, iov, n);
|
|
if (rc != size) {
|
|
n = ErrCode();
|
|
if (rc > 0)
|
|
DPUTS("short write, filesystem full?");
|
|
else
|
|
DPRINTF("writev: %s", strerror(n));
|
|
mdb_txn_abort(txn);
|
|
return n;
|
|
}
|
|
n = 0;
|
|
size = 0;
|
|
}
|
|
lseek(env->me_fd, dp->mp_pgno * env->me_psize, SEEK_SET);
|
|
next = dp->mp_pgno;
|
|
}
|
|
DPRINTF("committing page %lu", dp->mp_pgno);
|
|
iov[n].iov_len = env->me_psize;
|
|
if (IS_OVERFLOW(dp)) iov[n].iov_len *= dp->mp_pages;
|
|
iov[n].iov_base = dp;
|
|
size += iov[n].iov_len;
|
|
next = dp->mp_pgno + (IS_OVERFLOW(dp) ? dp->mp_pages : 1);
|
|
/* clear dirty flag */
|
|
dp->mp_flags &= ~P_DIRTY;
|
|
if (++n >= MDB_COMMIT_PAGES) {
|
|
done = 0;
|
|
i++;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (n == 0)
|
|
break;
|
|
|
|
DPRINTF("committing %u dirty pages", n);
|
|
rc = writev(env->me_fd, iov, n);
|
|
if (rc != size) {
|
|
n = ErrCode();
|
|
if (rc > 0)
|
|
DPUTS("short write, filesystem full?");
|
|
else
|
|
DPRINTF("writev: %s", strerror(n));
|
|
mdb_txn_abort(txn);
|
|
return n;
|
|
}
|
|
#endif
|
|
} while (!done);
|
|
|
|
/* Drop the dirty pages.
|
|
*/
|
|
for (i=1; i<=txn->mt_u.dirty_list[0].mid; i++) {
|
|
dp = txn->mt_u.dirty_list[i].mptr;
|
|
if (!IS_OVERFLOW(dp) || dp->mp_pages == 1) {
|
|
dp->mp_next = txn->mt_env->me_dpages;
|
|
txn->mt_env->me_dpages = dp;
|
|
} else {
|
|
free(dp);
|
|
}
|
|
txn->mt_u.dirty_list[i].mid = 0;
|
|
}
|
|
txn->mt_u.dirty_list[0].mid = 0;
|
|
|
|
if ((n = mdb_env_sync(env, 0)) != 0 ||
|
|
(n = mdb_env_write_meta(txn)) != MDB_SUCCESS) {
|
|
mdb_txn_abort(txn);
|
|
return n;
|
|
}
|
|
|
|
done:
|
|
env->me_txn = NULL;
|
|
/* update the DB tables */
|
|
{
|
|
int toggle = !env->me_db_toggle;
|
|
MDB_db *ip, *jp;
|
|
|
|
ip = &env->me_dbs[toggle][2];
|
|
jp = &txn->mt_dbs[2];
|
|
LAZY_RWLOCK_WRLOCK(&env->me_dblock);
|
|
for (i = 2; i < txn->mt_numdbs; i++) {
|
|
if (ip->md_root != jp->md_root)
|
|
*ip = *jp;
|
|
ip++; jp++;
|
|
}
|
|
|
|
for (i = 2; i < txn->mt_numdbs; i++) {
|
|
if (txn->mt_dbxs[i].md_dirty)
|
|
txn->mt_dbxs[i].md_dirty = 0;
|
|
}
|
|
env->me_db_toggle = toggle;
|
|
env->me_numdbs = txn->mt_numdbs;
|
|
LAZY_RWLOCK_UNLOCK(&env->me_dblock);
|
|
}
|
|
|
|
UNLOCK_MUTEX_W(env);
|
|
free(txn);
|
|
|
|
return MDB_SUCCESS;
|
|
}
|
|
|
|
/** 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)
|
|
{
|
|
char page[PAGESIZE];
|
|
MDB_page *p;
|
|
MDB_meta *m;
|
|
int rc, err;
|
|
|
|
/* We don't know the page size yet, so use a minimum value.
|
|
*/
|
|
|
|
#ifdef _WIN32
|
|
if (!ReadFile(env->me_fd, page, PAGESIZE, (DWORD *)&rc, NULL) || rc == 0)
|
|
#else
|
|
if ((rc = read(env->me_fd, page, PAGESIZE)) == 0)
|
|
#endif
|
|
{
|
|
return ENOENT;
|
|
}
|
|
else if (rc != PAGESIZE) {
|
|
err = ErrCode();
|
|
if (rc > 0)
|
|
err = EINVAL;
|
|
DPRINTF("read: %s", strerror(err));
|
|
return err;
|
|
}
|
|
|
|
p = (MDB_page *)page;
|
|
|
|
if (!F_ISSET(p->mp_flags, P_META)) {
|
|
DPRINTF("page %lu not a meta page", p->mp_pgno);
|
|
return EINVAL;
|
|
}
|
|
|
|
m = METADATA(p);
|
|
if (m->mm_magic != MDB_MAGIC) {
|
|
DPUTS("meta has invalid magic");
|
|
return EINVAL;
|
|
}
|
|
|
|
if (m->mm_version != MDB_VERSION) {
|
|
DPRINTF("database is version %u, expected version %u",
|
|
m->mm_version, MDB_VERSION);
|
|
return MDB_VERSION_MISMATCH;
|
|
}
|
|
|
|
memcpy(meta, m, sizeof(*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;
|
|
MDB_meta *m;
|
|
int rc;
|
|
unsigned int psize;
|
|
|
|
DPUTS("writing new meta page");
|
|
|
|
GetPageSize(psize);
|
|
|
|
meta->mm_magic = MDB_MAGIC;
|
|
meta->mm_version = MDB_VERSION;
|
|
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;
|
|
|
|
m = METADATA(p);
|
|
memcpy(m, meta, sizeof(*meta));
|
|
|
|
q = (MDB_page *)((char *)p + psize);
|
|
|
|
q->mp_pgno = 1;
|
|
q->mp_flags = P_META;
|
|
|
|
m = METADATA(q);
|
|
memcpy(m, meta, sizeof(*meta));
|
|
|
|
#ifdef _WIN32
|
|
{
|
|
DWORD len;
|
|
rc = WriteFile(env->me_fd, p, psize * 2, &len, NULL);
|
|
rc = (len == psize * 2) ? MDB_SUCCESS : ErrCode();
|
|
}
|
|
#else
|
|
rc = write(env->me_fd, p, psize * 2);
|
|
rc = (rc == (int)psize * 2) ? MDB_SUCCESS : ErrCode();
|
|
#endif
|
|
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;
|
|
off_t off;
|
|
int rc, len, toggle;
|
|
char *ptr;
|
|
#ifdef _WIN32
|
|
OVERLAPPED ov;
|
|
#endif
|
|
|
|
assert(txn != NULL);
|
|
assert(txn->mt_env != NULL);
|
|
|
|
toggle = !txn->mt_toggle;
|
|
DPRINTF("writing meta page %d for root page %lu",
|
|
toggle, txn->mt_dbs[MAIN_DBI].md_root);
|
|
|
|
env = txn->mt_env;
|
|
|
|
metab.mm_txnid = env->me_metas[toggle]->mm_txnid;
|
|
metab.mm_last_pg = env->me_metas[toggle]->mm_last_pg;
|
|
|
|
ptr = (char *)&meta;
|
|
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 */
|
|
#ifdef _WIN32
|
|
{
|
|
memset(&ov, 0, sizeof(ov));
|
|
ov.Offset = off;
|
|
WriteFile(env->me_mfd, ptr, len, (DWORD *)&rc, &ov);
|
|
}
|
|
#else
|
|
rc = pwrite(env->me_mfd, ptr, len, off);
|
|
#endif
|
|
if (rc != len) {
|
|
int r2;
|
|
rc = ErrCode();
|
|
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
|
|
WriteFile(env->me_fd, ptr, len, NULL, &ov);
|
|
#else
|
|
r2 = pwrite(env->me_fd, ptr, len, off);
|
|
#endif
|
|
env->me_flags |= MDB_FATAL_ERROR;
|
|
return rc;
|
|
}
|
|
/* 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.
|
|
*/
|
|
LAZY_MUTEX_LOCK(&env->me_txns->mti_mutex);
|
|
txn->mt_env->me_txns->mti_me_toggle = toggle;
|
|
txn->mt_env->me_txns->mti_txnid = txn->mt_txnid;
|
|
LAZY_MUTEX_UNLOCK(&env->me_txns->mti_mutex);
|
|
|
|
return MDB_SUCCESS;
|
|
}
|
|
|
|
/** Check both meta pages to see which one is newer.
|
|
* @param[in] env the environment handle
|
|
* @param[out] which address of where to store the meta toggle ID
|
|
* @return 0 on success, non-zero on failure.
|
|
*/
|
|
static int
|
|
mdb_env_read_meta(MDB_env *env, int *which)
|
|
{
|
|
int toggle = 0;
|
|
|
|
assert(env != NULL);
|
|
|
|
if (env->me_metas[0]->mm_txnid < env->me_metas[1]->mm_txnid)
|
|
toggle = 1;
|
|
|
|
DPRINTF("Using meta page %d", toggle);
|
|
*which = toggle;
|
|
|
|
return MDB_SUCCESS;
|
|
}
|
|
|
|
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 = 2;
|
|
e->me_fd = INVALID_HANDLE_VALUE;
|
|
e->me_lfd = INVALID_HANDLE_VALUE;
|
|
e->me_mfd = INVALID_HANDLE_VALUE;
|
|
*env = e;
|
|
return MDB_SUCCESS;
|
|
}
|
|
|
|
int
|
|
mdb_env_set_mapsize(MDB_env *env, size_t size)
|
|
{
|
|
if (env->me_map)
|
|
return EINVAL;
|
|
env->me_mapsize = size;
|
|
return MDB_SUCCESS;
|
|
}
|
|
|
|
int
|
|
mdb_env_set_maxdbs(MDB_env *env, int dbs)
|
|
{
|
|
if (env->me_map)
|
|
return EINVAL;
|
|
env->me_maxdbs = dbs;
|
|
return MDB_SUCCESS;
|
|
}
|
|
|
|
int
|
|
mdb_env_set_maxreaders(MDB_env *env, int readers)
|
|
{
|
|
if (env->me_map)
|
|
return EINVAL;
|
|
env->me_maxreaders = readers;
|
|
return MDB_SUCCESS;
|
|
}
|
|
|
|
int
|
|
mdb_env_get_maxreaders(MDB_env *env, 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)
|
|
{
|
|
int i, newenv = 0, toggle;
|
|
MDB_meta meta;
|
|
MDB_page *p;
|
|
|
|
env->me_flags = flags;
|
|
|
|
memset(&meta, 0, sizeof(meta));
|
|
|
|
if ((i = mdb_env_read_header(env, &meta)) != 0) {
|
|
if (i != ENOENT)
|
|
return i;
|
|
DPUTS("new mdbenv");
|
|
newenv = 1;
|
|
}
|
|
|
|
if (!env->me_mapsize) {
|
|
env->me_mapsize = newenv ? DEFAULT_MAPSIZE : meta.mm_mapsize;
|
|
}
|
|
|
|
#ifdef _WIN32
|
|
{
|
|
HANDLE mh;
|
|
LONG sizelo, sizehi;
|
|
sizelo = env->me_mapsize & 0xffffffff;
|
|
sizehi = env->me_mapsize >> 16; /* pointless on WIN32, only needed on W64 */
|
|
sizehi >>= 16;
|
|
/* Windows won't create mappings for zero length files.
|
|
* Just allocate the maxsize right now.
|
|
*/
|
|
if (newenv) {
|
|
SetFilePointer(env->me_fd, sizelo, sizehi ? &sizehi : NULL, 0);
|
|
if (!SetEndOfFile(env->me_fd))
|
|
return ErrCode();
|
|
SetFilePointer(env->me_fd, 0, NULL, 0);
|
|
}
|
|
mh = CreateFileMapping(env->me_fd, NULL, PAGE_READONLY,
|
|
sizehi, sizelo, NULL);
|
|
if (!mh)
|
|
return ErrCode();
|
|
env->me_map = MapViewOfFileEx(mh, FILE_MAP_READ, 0, 0, env->me_mapsize,
|
|
meta.mm_address);
|
|
CloseHandle(mh);
|
|
if (!env->me_map)
|
|
return ErrCode();
|
|
}
|
|
#else
|
|
i = MAP_SHARED;
|
|
if (meta.mm_address && (flags & MDB_FIXEDMAP))
|
|
i |= MAP_FIXED;
|
|
env->me_map = mmap(meta.mm_address, env->me_mapsize, PROT_READ, i,
|
|
env->me_fd, 0);
|
|
if (env->me_map == MAP_FAILED)
|
|
return ErrCode();
|
|
#endif
|
|
|
|
if (newenv) {
|
|
meta.mm_mapsize = env->me_mapsize;
|
|
if (flags & MDB_FIXEDMAP)
|
|
meta.mm_address = env->me_map;
|
|
i = mdb_env_init_meta(env, &meta);
|
|
if (i != MDB_SUCCESS) {
|
|
munmap(env->me_map, env->me_mapsize);
|
|
return i;
|
|
}
|
|
}
|
|
env->me_psize = meta.mm_psize;
|
|
|
|
env->me_maxpg = env->me_mapsize / env->me_psize;
|
|
|
|
p = (MDB_page *)env->me_map;
|
|
env->me_metas[0] = METADATA(p);
|
|
env->me_metas[1] = (MDB_meta *)((char *)env->me_metas[0] + meta.mm_psize);
|
|
|
|
if ((i = mdb_env_read_meta(env, &toggle)) != 0)
|
|
return i;
|
|
|
|
DPRINTF("opened database version %u, pagesize %u",
|
|
env->me_metas[toggle]->mm_version, env->me_psize);
|
|
DPRINTF("depth: %u", env->me_metas[toggle]->mm_dbs[MAIN_DBI].md_depth);
|
|
DPRINTF("entries: %lu", env->me_metas[toggle]->mm_dbs[MAIN_DBI].md_entries);
|
|
DPRINTF("branch pages: %lu", env->me_metas[toggle]->mm_dbs[MAIN_DBI].md_branch_pages);
|
|
DPRINTF("leaf pages: %lu", env->me_metas[toggle]->mm_dbs[MAIN_DBI].md_leaf_pages);
|
|
DPRINTF("overflow pages: %lu", env->me_metas[toggle]->mm_dbs[MAIN_DBI].md_overflow_pages);
|
|
DPRINTF("root: %lu", env->me_metas[toggle]->mm_dbs[MAIN_DBI].md_root);
|
|
|
|
return MDB_SUCCESS;
|
|
}
|
|
|
|
#ifndef _WIN32
|
|
/* Windows doesn't support destructor callbacks for thread-specific storage */
|
|
static void
|
|
mdb_env_reader_dest(void *ptr)
|
|
{
|
|
MDB_reader *reader = ptr;
|
|
|
|
reader->mr_txnid = 0;
|
|
reader->mr_pid = 0;
|
|
reader->mr_tid = 0;
|
|
}
|
|
#endif
|
|
|
|
/* downgrade the exclusive lock on the region back to shared */
|
|
static void
|
|
mdb_env_share_locks(MDB_env *env)
|
|
{
|
|
int toggle = 0;
|
|
|
|
if (env->me_metas[0]->mm_txnid < env->me_metas[1]->mm_txnid)
|
|
toggle = 1;
|
|
env->me_txns->mti_me_toggle = toggle;
|
|
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));
|
|
LockFileEx(env->me_lfd, 0, 0, 1, 0, &ov);
|
|
UnlockFile(env->me_lfd, 0, 0, 1, 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;
|
|
fcntl(env->me_lfd, F_SETLK, &lock_info);
|
|
}
|
|
#endif
|
|
}
|
|
|
|
static int
|
|
mdb_env_setup_locks(MDB_env *env, char *lpath, int mode, int *excl)
|
|
{
|
|
int rc;
|
|
off_t size, rsize;
|
|
|
|
*excl = 0;
|
|
|
|
#ifdef _WIN32
|
|
if ((env->me_lfd = CreateFile(lpath, GENERIC_READ|GENERIC_WRITE,
|
|
FILE_SHARE_READ|FILE_SHARE_WRITE, NULL, OPEN_ALWAYS,
|
|
FILE_ATTRIBUTE_NORMAL, NULL)) == INVALID_HANDLE_VALUE) {
|
|
rc = ErrCode();
|
|
return rc;
|
|
}
|
|
/* Try to get exclusive lock. If we succeed, then
|
|
* nobody is using the lock region and we should initialize it.
|
|
*/
|
|
{
|
|
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)) {
|
|
rc = ErrCode();
|
|
goto fail;
|
|
}
|
|
}
|
|
}
|
|
size = GetFileSize(env->me_lfd, NULL);
|
|
#else
|
|
if ((env->me_lfd = open(lpath, O_RDWR|O_CREAT, mode)) == -1) {
|
|
rc = ErrCode();
|
|
return rc;
|
|
}
|
|
/* Try to get exclusive lock. If we succeed, then
|
|
* nobody is using the lock region and we should initialize it.
|
|
*/
|
|
{
|
|
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;
|
|
rc = fcntl(env->me_lfd, F_SETLK, &lock_info);
|
|
if (rc == 0) {
|
|
*excl = 1;
|
|
} else {
|
|
lock_info.l_type = F_RDLCK;
|
|
rc = fcntl(env->me_lfd, F_SETLKW, &lock_info);
|
|
if (rc) {
|
|
rc = ErrCode();
|
|
goto fail;
|
|
}
|
|
}
|
|
}
|
|
size = lseek(env->me_lfd, 0, SEEK_END);
|
|
#endif
|
|
rsize = (env->me_maxreaders-1) * sizeof(MDB_reader) + sizeof(MDB_txninfo);
|
|
if (size < rsize && *excl) {
|
|
#ifdef _WIN32
|
|
SetFilePointer(env->me_lfd, rsize, NULL, 0);
|
|
if (!SetEndOfFile(env->me_lfd)) {
|
|
rc = ErrCode();
|
|
goto fail;
|
|
}
|
|
#else
|
|
if (ftruncate(env->me_lfd, rsize) != 0) {
|
|
rc = ErrCode();
|
|
goto fail;
|
|
}
|
|
#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) {
|
|
rc = ErrCode();
|
|
goto fail;
|
|
}
|
|
env->me_txns = MapViewOfFileEx(mh, FILE_MAP_WRITE, 0, 0, rsize, NULL);
|
|
CloseHandle(mh);
|
|
if (!env->me_txns) {
|
|
rc = ErrCode();
|
|
goto fail;
|
|
}
|
|
}
|
|
#else
|
|
env->me_txns = mmap(0, rsize, PROT_READ|PROT_WRITE, MAP_SHARED,
|
|
env->me_lfd, 0);
|
|
if (env->me_txns == MAP_FAILED) {
|
|
rc = ErrCode();
|
|
goto fail;
|
|
}
|
|
#endif
|
|
if (*excl) {
|
|
#ifdef _WIN32
|
|
char *ptr;
|
|
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;
|
|
}
|
|
/* FIXME: only using up to 20 characters of the env path here,
|
|
* probably not enough to assure uniqueness...
|
|
*/
|
|
sprintf(env->me_txns->mti_rmname, "Global\\MDBr%.20s", lpath);
|
|
ptr = env->me_txns->mti_rmname + sizeof("Global\\MDBr");
|
|
while ((ptr = strchr(ptr, '\\')))
|
|
*ptr++ = '/';
|
|
env->me_rmutex = CreateMutex(&mdb_all_sa, FALSE, env->me_txns->mti_rmname);
|
|
if (!env->me_rmutex) {
|
|
rc = ErrCode();
|
|
goto fail;
|
|
}
|
|
sprintf(env->me_txns->mti_rmname, "Global\\MDBw%.20s", lpath);
|
|
ptr = env->me_txns->mti_rmname + sizeof("Global\\MDBw");
|
|
while ((ptr = strchr(ptr, '\\')))
|
|
*ptr++ = '/';
|
|
env->me_wmutex = CreateMutex(&mdb_all_sa, FALSE, env->me_txns->mti_rmname);
|
|
if (!env->me_wmutex) {
|
|
rc = ErrCode();
|
|
goto fail;
|
|
}
|
|
#else
|
|
pthread_mutexattr_t mattr;
|
|
|
|
pthread_mutexattr_init(&mattr);
|
|
rc = pthread_mutexattr_setpshared(&mattr, PTHREAD_PROCESS_SHARED);
|
|
if (rc) {
|
|
goto fail;
|
|
}
|
|
pthread_mutex_init(&env->me_txns->mti_mutex, &mattr);
|
|
pthread_mutex_init(&env->me_txns->mti_wmutex, &mattr);
|
|
#endif
|
|
env->me_txns->mti_version = MDB_VERSION;
|
|
env->me_txns->mti_magic = MDB_MAGIC;
|
|
env->me_txns->mti_txnid = 0;
|
|
env->me_txns->mti_numreaders = 0;
|
|
env->me_txns->mti_me_toggle = 0;
|
|
|
|
} else {
|
|
if (env->me_txns->mti_magic != MDB_MAGIC) {
|
|
DPUTS("lock region has invalid magic");
|
|
rc = EINVAL;
|
|
goto fail;
|
|
}
|
|
if (env->me_txns->mti_version != MDB_VERSION) {
|
|
DPRINTF("lock region is version %u, expected version %u",
|
|
env->me_txns->mti_version, MDB_VERSION);
|
|
rc = MDB_VERSION_MISMATCH;
|
|
goto fail;
|
|
}
|
|
rc = ErrCode();
|
|
if (rc != EACCES && rc != EAGAIN) {
|
|
goto fail;
|
|
}
|
|
#ifdef _WIN32
|
|
env->me_rmutex = OpenMutex(SYNCHRONIZE, FALSE, env->me_txns->mti_rmname);
|
|
if (!env->me_rmutex) {
|
|
rc = ErrCode();
|
|
goto fail;
|
|
}
|
|
env->me_wmutex = OpenMutex(SYNCHRONIZE, FALSE, env->me_txns->mti_wmname);
|
|
if (!env->me_wmutex) {
|
|
rc = ErrCode();
|
|
goto fail;
|
|
}
|
|
#endif
|
|
}
|
|
return MDB_SUCCESS;
|
|
|
|
fail:
|
|
close(env->me_lfd);
|
|
env->me_lfd = INVALID_HANDLE_VALUE;
|
|
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"
|
|
int
|
|
mdb_env_open(MDB_env *env, const char *path, unsigned int flags, mode_t mode)
|
|
{
|
|
int oflags, rc, len, excl;
|
|
char *lpath, *dpath;
|
|
|
|
len = strlen(path);
|
|
lpath = malloc(len + sizeof(LOCKNAME) + len + sizeof(DATANAME));
|
|
if (!lpath)
|
|
return ENOMEM;
|
|
dpath = lpath + len + sizeof(LOCKNAME);
|
|
sprintf(lpath, "%s" LOCKNAME, path);
|
|
sprintf(dpath, "%s" DATANAME, path);
|
|
|
|
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;
|
|
if ((env->me_fd = CreateFile(dpath, oflags, FILE_SHARE_READ|FILE_SHARE_WRITE,
|
|
NULL, len, mode, NULL)) == INVALID_HANDLE_VALUE) {
|
|
rc = ErrCode();
|
|
goto leave;
|
|
}
|
|
#else
|
|
if (F_ISSET(flags, MDB_RDONLY))
|
|
oflags = O_RDONLY;
|
|
else
|
|
oflags = O_RDWR | O_CREAT;
|
|
|
|
if ((env->me_fd = open(dpath, oflags, mode)) == -1) {
|
|
rc = ErrCode();
|
|
goto leave;
|
|
}
|
|
#endif
|
|
|
|
if ((rc = mdb_env_open2(env, flags)) == MDB_SUCCESS) {
|
|
/* synchronous fd for meta writes */
|
|
#ifdef _WIN32
|
|
if (!(flags & (MDB_RDONLY|MDB_NOSYNC)))
|
|
mode |= FILE_FLAG_WRITE_THROUGH;
|
|
if ((env->me_mfd = CreateFile(dpath, oflags, FILE_SHARE_READ|FILE_SHARE_WRITE,
|
|
NULL, len, mode, NULL)) == INVALID_HANDLE_VALUE) {
|
|
rc = ErrCode();
|
|
goto leave;
|
|
}
|
|
#else
|
|
if (!(flags & (MDB_RDONLY|MDB_NOSYNC)))
|
|
oflags |= MDB_DSYNC;
|
|
if ((env->me_mfd = open(dpath, oflags, mode)) == -1) {
|
|
rc = ErrCode();
|
|
goto leave;
|
|
}
|
|
#endif
|
|
env->me_path = strdup(path);
|
|
DPRINTF("opened dbenv %p", (void *) env);
|
|
pthread_key_create(&env->me_txkey, mdb_env_reader_dest);
|
|
LAZY_RWLOCK_INIT(&env->me_dblock, NULL);
|
|
if (excl)
|
|
mdb_env_share_locks(env);
|
|
env->me_dbxs = calloc(env->me_maxdbs, sizeof(MDB_dbx));
|
|
env->me_dbs[0] = calloc(env->me_maxdbs, sizeof(MDB_db));
|
|
env->me_dbs[1] = calloc(env->me_maxdbs, sizeof(MDB_db));
|
|
env->me_numdbs = 2;
|
|
}
|
|
|
|
leave:
|
|
if (rc) {
|
|
if (env->me_fd != INVALID_HANDLE_VALUE) {
|
|
close(env->me_fd);
|
|
env->me_fd = INVALID_HANDLE_VALUE;
|
|
}
|
|
if (env->me_lfd != INVALID_HANDLE_VALUE) {
|
|
close(env->me_lfd);
|
|
env->me_lfd = INVALID_HANDLE_VALUE;
|
|
}
|
|
}
|
|
free(lpath);
|
|
return rc;
|
|
}
|
|
|
|
void
|
|
mdb_env_close(MDB_env *env)
|
|
{
|
|
MDB_page *dp;
|
|
|
|
if (env == NULL)
|
|
return;
|
|
|
|
while (env->me_dpages) {
|
|
dp = env->me_dpages;
|
|
env->me_dpages = dp->mp_next;
|
|
free(dp);
|
|
}
|
|
|
|
free(env->me_dbs[1]);
|
|
free(env->me_dbs[0]);
|
|
free(env->me_dbxs);
|
|
free(env->me_path);
|
|
|
|
LAZY_RWLOCK_DESTROY(&env->me_dblock);
|
|
pthread_key_delete(env->me_txkey);
|
|
|
|
if (env->me_map) {
|
|
munmap(env->me_map, env->me_mapsize);
|
|
}
|
|
close(env->me_mfd);
|
|
close(env->me_fd);
|
|
if (env->me_txns) {
|
|
pid_t pid = getpid();
|
|
unsigned int i;
|
|
for (i=0; i<env->me_txns->mti_numreaders; i++)
|
|
if (env->me_txns->mti_readers[i].mr_pid == pid)
|
|
env->me_txns->mti_readers[i].mr_pid = 0;
|
|
munmap(env->me_txns, (env->me_maxreaders-1)*sizeof(MDB_reader)+sizeof(MDB_txninfo));
|
|
}
|
|
close(env->me_lfd);
|
|
free(env);
|
|
}
|
|
|
|
/* only for aligned ints */
|
|
static int
|
|
intcmp(const MDB_val *a, const MDB_val *b)
|
|
{
|
|
if (a->mv_size == sizeof(long))
|
|
{
|
|
unsigned long *la, *lb;
|
|
la = a->mv_data;
|
|
lb = b->mv_data;
|
|
return *la - *lb;
|
|
} else {
|
|
unsigned int *ia, *ib;
|
|
ia = a->mv_data;
|
|
ib = b->mv_data;
|
|
return *ia - *ib;
|
|
}
|
|
}
|
|
|
|
/* ints must always be the same size */
|
|
static int
|
|
cintcmp(const MDB_val *a, const MDB_val *b)
|
|
{
|
|
#if __BYTE_ORDER == __LITTLE_ENDIAN
|
|
unsigned short *u, *c;
|
|
int x;
|
|
|
|
u = a->mv_data + a->mv_size;
|
|
c = 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
|
|
}
|
|
|
|
static int
|
|
memncmp(const MDB_val *a, const MDB_val *b)
|
|
{
|
|
int diff, len_diff;
|
|
unsigned int len;
|
|
|
|
len = a->mv_size;
|
|
len_diff = a->mv_size - b->mv_size;
|
|
if (len_diff > 0)
|
|
len = b->mv_size;
|
|
diff = memcmp(a->mv_data, b->mv_data, len);
|
|
return diff ? diff : len_diff;
|
|
}
|
|
|
|
static int
|
|
memnrcmp(const MDB_val *a, const MDB_val *b)
|
|
{
|
|
const unsigned char *p1, *p2, *p1_lim;
|
|
int diff, len_diff;
|
|
|
|
if (b->mv_size == 0)
|
|
return a->mv_size != 0;
|
|
if (a->mv_size == 0)
|
|
return -1;
|
|
|
|
p1 = (const unsigned char *)a->mv_data + a->mv_size - 1;
|
|
p2 = (const unsigned char *)b->mv_data + b->mv_size - 1;
|
|
|
|
len_diff = a->mv_size - b->mv_size;
|
|
if (len_diff < 0)
|
|
p1_lim = p1 - a->mv_size;
|
|
else
|
|
p1_lim = p1 - b->mv_size;
|
|
|
|
while (p1 > p1_lim) {
|
|
diff = *p1 - *p2;
|
|
if (diff)
|
|
return diff;
|
|
p1--;
|
|
p2--;
|
|
}
|
|
return len_diff;
|
|
}
|
|
|
|
/* Search for key within a leaf 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).
|
|
* If kip is non-null, stores the index of the found entry in *kip.
|
|
* If no entry larger or equal to the key is found, returns NULL.
|
|
*/
|
|
static MDB_node *
|
|
mdb_search_node(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);
|
|
|
|
DPRINTF("searching %u keys in %s page %lu",
|
|
nkeys, IS_LEAF(mp) ? "leaf" : "branch",
|
|
mp->mp_pgno);
|
|
|
|
assert(nkeys > 0);
|
|
|
|
low = IS_LEAF(mp) ? 0 : 1;
|
|
high = nkeys - 1;
|
|
cmp = mc->mc_txn->mt_dbxs[mc->mc_dbi].md_cmp;
|
|
if (IS_LEAF2(mp)) {
|
|
nodekey.mv_size = mc->mc_txn->mt_dbs[mc->mc_dbi].md_pad;
|
|
node = NODEPTR(mp, 0); /* fake */
|
|
}
|
|
while (low <= high) {
|
|
i = (low + high) >> 1;
|
|
|
|
if (IS_LEAF2(mp)) {
|
|
nodekey.mv_data = LEAF2KEY(mp, i, nodekey.mv_size);
|
|
} else {
|
|
node = NODEPTR(mp, i);
|
|
|
|
nodekey.mv_size = node->mn_ksize;
|
|
nodekey.mv_data = NODEKEY(node);
|
|
}
|
|
|
|
rc = cmp(key, &nodekey);
|
|
|
|
#if DEBUG
|
|
if (IS_LEAF(mp))
|
|
DPRINTF("found leaf index %u [%s], rc = %i",
|
|
i, DKEY(&nodekey), rc);
|
|
else
|
|
DPRINTF("found branch index %u [%s -> %lu], 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;
|
|
}
|
|
|
|
static void
|
|
cursor_pop_page(MDB_cursor *mc)
|
|
{
|
|
MDB_page *top;
|
|
|
|
if (mc->mc_snum) {
|
|
top = mc->mc_pg[mc->mc_top];
|
|
mc->mc_snum--;
|
|
if (mc->mc_snum)
|
|
mc->mc_top--;
|
|
|
|
DPRINTF("popped page %lu off db %u cursor %p", top->mp_pgno,
|
|
mc->mc_dbi, (void *) mc);
|
|
}
|
|
}
|
|
|
|
static int
|
|
cursor_push_page(MDB_cursor *mc, MDB_page *mp)
|
|
{
|
|
DPRINTF("pushing page %lu on db %u cursor %p", mp->mp_pgno,
|
|
mc->mc_dbi, (void *) mc);
|
|
|
|
if (mc->mc_snum >= CURSOR_STACK)
|
|
return ENOMEM;
|
|
|
|
mc->mc_top = mc->mc_snum++;
|
|
mc->mc_pg[mc->mc_top] = mp;
|
|
mc->mc_ki[mc->mc_top] = 0;
|
|
|
|
return MDB_SUCCESS;
|
|
}
|
|
|
|
static int
|
|
mdb_get_page(MDB_txn *txn, pgno_t pgno, MDB_page **ret)
|
|
{
|
|
MDB_page *p = NULL;
|
|
|
|
if (!F_ISSET(txn->mt_flags, MDB_TXN_RDONLY) && txn->mt_u.dirty_list[0].mid) {
|
|
unsigned x;
|
|
x = mdb_mid2l_search(txn->mt_u.dirty_list, pgno);
|
|
if (x <= txn->mt_u.dirty_list[0].mid && txn->mt_u.dirty_list[x].mid == pgno) {
|
|
p = txn->mt_u.dirty_list[x].mptr;
|
|
}
|
|
}
|
|
if (!p) {
|
|
if (pgno <= txn->mt_env->me_metas[txn->mt_toggle]->mm_last_pg)
|
|
p = (MDB_page *)(txn->mt_env->me_map + txn->mt_env->me_psize * pgno);
|
|
}
|
|
*ret = p;
|
|
if (!p) {
|
|
DPRINTF("page %lu not found", pgno);
|
|
assert(p != NULL);
|
|
}
|
|
return (p != NULL) ? MDB_SUCCESS : MDB_PAGE_NOTFOUND;
|
|
}
|
|
|
|
static int
|
|
mdb_search_page_root(MDB_cursor *mc, MDB_val *key, int modify)
|
|
{
|
|
MDB_page *mp = mc->mc_pg[mc->mc_top];
|
|
DKBUF;
|
|
int rc;
|
|
|
|
|
|
while (IS_BRANCH(mp)) {
|
|
MDB_node *node;
|
|
|
|
DPRINTF("branch page %lu has %u keys", mp->mp_pgno, NUMKEYS(mp));
|
|
assert(NUMKEYS(mp) > 1);
|
|
DPRINTF("found index 0 to page %lu", NODEPGNO(NODEPTR(mp, 0)));
|
|
|
|
if (key == NULL) /* Initialize cursor to first page. */
|
|
mc->mc_ki[mc->mc_top] = 0;
|
|
else if (key->mv_size > MAXKEYSIZE && key->mv_data == NULL) {
|
|
/* cursor to last page */
|
|
mc->mc_ki[mc->mc_top] = NUMKEYS(mp)-1;
|
|
} else {
|
|
int exact;
|
|
node = mdb_search_node(mc, key, &exact);
|
|
if (node == NULL)
|
|
mc->mc_ki[mc->mc_top] = NUMKEYS(mp) - 1;
|
|
else if (!exact) {
|
|
assert(mc->mc_ki[mc->mc_top] > 0);
|
|
mc->mc_ki[mc->mc_top]--;
|
|
}
|
|
}
|
|
|
|
if (key)
|
|
DPRINTF("following index %u for key [%s]",
|
|
mc->mc_ki[mc->mc_top], DKEY(key));
|
|
assert(mc->mc_ki[mc->mc_top] < NUMKEYS(mp));
|
|
node = NODEPTR(mp, mc->mc_ki[mc->mc_top]);
|
|
|
|
if ((rc = mdb_get_page(mc->mc_txn, NODEPGNO(node), &mp)))
|
|
return rc;
|
|
|
|
if ((rc = cursor_push_page(mc, mp)))
|
|
return rc;
|
|
|
|
if (modify) {
|
|
if ((rc = mdb_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 %lu for key [%s]", mp->mp_pgno,
|
|
key ? DKEY(key) : NULL);
|
|
|
|
return MDB_SUCCESS;
|
|
}
|
|
|
|
/* Search for the page a given key should be in.
|
|
* Pushes parent pages on the cursor stack.
|
|
* If key is NULL, search for the lowest page (used by mdb_cursor_first).
|
|
* If modify is true, visited pages are updated with new page numbers.
|
|
*/
|
|
static int
|
|
mdb_search_page(MDB_cursor *mc, MDB_val *key, int modify)
|
|
{
|
|
int rc;
|
|
pgno_t root;
|
|
|
|
/* Make sure the txn is still viable, then find the root from
|
|
* the txn's db table.
|
|
*/
|
|
if (F_ISSET(mc->mc_txn->mt_flags, MDB_TXN_ERROR)) {
|
|
DPUTS("transaction has failed, must abort");
|
|
return EINVAL;
|
|
} else
|
|
root = mc->mc_txn->mt_dbs[mc->mc_dbi].md_root;
|
|
|
|
if (root == P_INVALID) { /* Tree is empty. */
|
|
DPUTS("tree is empty");
|
|
return MDB_NOTFOUND;
|
|
}
|
|
|
|
if ((rc = mdb_get_page(mc->mc_txn, root, &mc->mc_pg[0])))
|
|
return rc;
|
|
|
|
mc->mc_snum = 1;
|
|
mc->mc_top = 0;
|
|
|
|
DPRINTF("db %u root page %lu has flags 0x%X",
|
|
mc->mc_dbi, root, mc->mc_pg[0]->mp_flags);
|
|
|
|
if (modify) {
|
|
/* For sub-databases, update main root first */
|
|
if (mc->mc_dbi > MAIN_DBI && !mc->mc_txn->mt_dbxs[mc->mc_dbi].md_dirty) {
|
|
MDB_cursor mc2;
|
|
mc2.mc_txn = mc->mc_txn;
|
|
mc2.mc_dbi = MAIN_DBI;
|
|
rc = mdb_search_page(&mc2, &mc->mc_txn->mt_dbxs[mc->mc_dbi].md_name, 1);
|
|
if (rc)
|
|
return rc;
|
|
mc->mc_txn->mt_dbxs[mc->mc_dbi].md_dirty = 1;
|
|
}
|
|
if (!F_ISSET(mc->mc_pg[0]->mp_flags, P_DIRTY)) {
|
|
if ((rc = mdb_touch(mc)))
|
|
return rc;
|
|
mc->mc_txn->mt_dbs[mc->mc_dbi].md_root = mc->mc_pg[0]->mp_pgno;
|
|
}
|
|
}
|
|
|
|
return mdb_search_page_root(mc, key, modify);
|
|
}
|
|
|
|
static int
|
|
mdb_read_data(MDB_txn *txn, MDB_node *leaf, MDB_val *data)
|
|
{
|
|
MDB_page *omp; /* overflow mpage */
|
|
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_get_page(txn, pgno, &omp))) {
|
|
DPRINTF("read overflow page %lu 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)
|
|
return EINVAL;
|
|
|
|
if (key->mv_size == 0 || key->mv_size > MAXKEYSIZE) {
|
|
return EINVAL;
|
|
}
|
|
|
|
mc.mc_txn = txn;
|
|
mc.mc_dbi = dbi;
|
|
mc.mc_flags = 0;
|
|
if (txn->mt_dbs[dbi].md_flags & MDB_DUPSORT) {
|
|
mc.mc_xcursor = &mx;
|
|
mdb_xcursor_init0(&mc);
|
|
} else {
|
|
mc.mc_xcursor = NULL;
|
|
}
|
|
return mdb_cursor_set(&mc, key, data, MDB_SET, &exact);
|
|
}
|
|
|
|
static int
|
|
mdb_sibling(MDB_cursor *mc, int move_right)
|
|
{
|
|
int rc;
|
|
unsigned int ptop;
|
|
MDB_node *indx;
|
|
MDB_page *mp;
|
|
|
|
if (mc->mc_snum < 2) {
|
|
return MDB_NOTFOUND; /* root has no siblings */
|
|
}
|
|
ptop = mc->mc_top-1;
|
|
|
|
DPRINTF("parent page is page %lu, index %u",
|
|
mc->mc_pg[ptop]->mp_pgno, mc->mc_ki[ptop]);
|
|
|
|
cursor_pop_page(mc);
|
|
if (move_right ? (mc->mc_ki[ptop] + 1u >= NUMKEYS(mc->mc_pg[ptop]))
|
|
: (mc->mc_ki[ptop] == 0)) {
|
|
DPRINTF("no more keys left, moving to %s sibling",
|
|
move_right ? "right" : "left");
|
|
if ((rc = mdb_sibling(mc, move_right)) != MDB_SUCCESS)
|
|
return rc;
|
|
} else {
|
|
if (move_right)
|
|
mc->mc_ki[ptop]++;
|
|
else
|
|
mc->mc_ki[ptop]--;
|
|
DPRINTF("just moving to %s index key %u",
|
|
move_right ? "right" : "left", mc->mc_ki[ptop]);
|
|
}
|
|
assert(IS_BRANCH(mc->mc_pg[ptop]));
|
|
|
|
indx = NODEPTR(mc->mc_pg[ptop], mc->mc_ki[ptop]);
|
|
if ((rc = mdb_get_page(mc->mc_txn, NODEPGNO(indx), &mp)))
|
|
return rc;;
|
|
|
|
cursor_push_page(mc, mp);
|
|
|
|
return MDB_SUCCESS;
|
|
}
|
|
|
|
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_txn->mt_dbs[mc->mc_dbi].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_SUCCESS)
|
|
return rc;
|
|
}
|
|
} else {
|
|
mc->mc_xcursor->mx_cursor.mc_flags = 0;
|
|
if (op == MDB_NEXT_DUP)
|
|
return MDB_NOTFOUND;
|
|
}
|
|
}
|
|
|
|
DPRINTF("cursor_next: top page is %lu in cursor %p", mp->mp_pgno, (void *) mc);
|
|
|
|
if (mc->mc_ki[mc->mc_top] + 1u >= NUMKEYS(mp)) {
|
|
DPUTS("=====> move to next sibling page");
|
|
if (mdb_sibling(mc, 1) != MDB_SUCCESS) {
|
|
mc->mc_flags |= C_EOF;
|
|
return MDB_NOTFOUND;
|
|
}
|
|
mp = mc->mc_pg[mc->mc_top];
|
|
DPRINTF("next page is %lu, key index %u", mp->mp_pgno, mc->mc_ki[mc->mc_top]);
|
|
} else
|
|
mc->mc_ki[mc->mc_top]++;
|
|
|
|
DPRINTF("==> cursor points to page %lu 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_txn->mt_dbs[mc->mc_dbi].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_read_data(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_SET_KEY(leaf, key);
|
|
return MDB_SUCCESS;
|
|
}
|
|
|
|
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_txn->mt_dbs[mc->mc_dbi].md_flags & MDB_DUPSORT) {
|
|
leaf = NODEPTR(mp, mc->mc_ki[mc->mc_top]);
|
|
if (op == MDB_PREV || op == MDB_PREV_DUP) {
|
|
if (F_ISSET(leaf->mn_flags, F_DUPDATA)) {
|
|
rc = mdb_cursor_prev(&mc->mc_xcursor->mx_cursor, data, NULL, MDB_PREV);
|
|
if (op != MDB_PREV || rc == MDB_SUCCESS)
|
|
return rc;
|
|
} else {
|
|
mc->mc_xcursor->mx_cursor.mc_flags = 0;
|
|
if (op == MDB_PREV_DUP)
|
|
return MDB_NOTFOUND;
|
|
}
|
|
}
|
|
}
|
|
|
|
DPRINTF("cursor_prev: top page is %lu in cursor %p", mp->mp_pgno, (void *) mc);
|
|
|
|
if (mc->mc_ki[mc->mc_top] == 0) {
|
|
DPUTS("=====> move to prev sibling page");
|
|
if (mdb_sibling(mc, 0) != MDB_SUCCESS) {
|
|
mc->mc_flags &= ~C_INITIALIZED;
|
|
return MDB_NOTFOUND;
|
|
}
|
|
mp = mc->mc_pg[mc->mc_top];
|
|
mc->mc_ki[mc->mc_top] = NUMKEYS(mp) - 1;
|
|
DPRINTF("prev page is %lu, 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 %lu 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_txn->mt_dbs[mc->mc_dbi].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_read_data(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_SET_KEY(leaf, key);
|
|
return MDB_SUCCESS;
|
|
}
|
|
|
|
static int
|
|
mdb_cursor_set(MDB_cursor *mc, MDB_val *key, MDB_val *data,
|
|
MDB_cursor_op op, int *exactp)
|
|
{
|
|
int rc;
|
|
MDB_node *leaf;
|
|
DKBUF;
|
|
|
|
assert(mc);
|
|
assert(key);
|
|
assert(key->mv_size > 0);
|
|
|
|
/* See if we're already on the right page */
|
|
if (mc->mc_flags & C_INITIALIZED) {
|
|
MDB_val nodekey;
|
|
|
|
if (mc->mc_pg[mc->mc_top]->mp_flags & P_LEAF2) {
|
|
nodekey.mv_size = mc->mc_txn->mt_dbs[mc->mc_dbi].md_pad;
|
|
nodekey.mv_data = LEAF2KEY(mc->mc_pg[mc->mc_top], 0, nodekey.mv_size);
|
|
} else {
|
|
leaf = NODEPTR(mc->mc_pg[mc->mc_top], 0);
|
|
MDB_SET_KEY(leaf, &nodekey);
|
|
}
|
|
rc = mc->mc_txn->mt_dbxs[mc->mc_dbi].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;
|
|
set1:
|
|
if (exactp)
|
|
*exactp = 1;
|
|
leaf = NODEPTR(mc->mc_pg[mc->mc_top], mc->mc_ki[mc->mc_top]);
|
|
goto set3;
|
|
}
|
|
if (rc > 0) {
|
|
unsigned int i;
|
|
if (NUMKEYS(mc->mc_pg[mc->mc_top]) > 1) {
|
|
if (mc->mc_pg[mc->mc_top]->mp_flags & P_LEAF2) {
|
|
nodekey.mv_data = LEAF2KEY(mc->mc_pg[mc->mc_top],
|
|
NUMKEYS(mc->mc_pg[mc->mc_top])-1, nodekey.mv_size);
|
|
} else {
|
|
leaf = NODEPTR(mc->mc_pg[mc->mc_top], NUMKEYS(mc->mc_pg[mc->mc_top])-1);
|
|
MDB_SET_KEY(leaf, &nodekey);
|
|
}
|
|
rc = mc->mc_txn->mt_dbxs[mc->mc_dbi].md_cmp(key, &nodekey);
|
|
if (rc == 0) {
|
|
/* last node was the one we wanted */
|
|
mc->mc_ki[mc->mc_top] = NUMKEYS(mc->mc_pg[mc->mc_top])-1;
|
|
goto set1;
|
|
}
|
|
if (rc < 0) {
|
|
/* This is definitely the right page, skip search_page */
|
|
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] = NUMKEYS(mc->mc_pg[mc->mc_top]);
|
|
return MDB_NOTFOUND;
|
|
}
|
|
}
|
|
}
|
|
|
|
rc = mdb_search_page(mc, key, 0);
|
|
if (rc != MDB_SUCCESS)
|
|
return rc;
|
|
|
|
assert(IS_LEAF(mc->mc_pg[mc->mc_top]));
|
|
|
|
set2:
|
|
leaf = mdb_search_node(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_sibling(mc, 1)) != MDB_SUCCESS)
|
|
return rc; /* no entries matched */
|
|
mc->mc_ki[mc->mc_top] = 0;
|
|
assert(IS_LEAF(mc->mc_pg[mc->mc_top]));
|
|
leaf = NODEPTR(mc->mc_pg[mc->mc_top], 0);
|
|
}
|
|
|
|
set3:
|
|
mc->mc_flags |= C_INITIALIZED;
|
|
mc->mc_flags &= ~C_EOF;
|
|
|
|
if (IS_LEAF2(mc->mc_pg[mc->mc_top])) {
|
|
key->mv_size = mc->mc_txn->mt_dbs[mc->mc_dbi].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 (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_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_read_data(mc->mc_txn, leaf, &d2)) != MDB_SUCCESS)
|
|
return rc;
|
|
rc = mc->mc_txn->mt_dbxs[mc->mc_dbi].md_dcmp(data, &d2);
|
|
if (rc) {
|
|
if (op == MDB_GET_BOTH || rc > 0)
|
|
return MDB_NOTFOUND;
|
|
}
|
|
|
|
} else {
|
|
if ((rc = mdb_read_data(mc->mc_txn, leaf, data)) != MDB_SUCCESS)
|
|
return rc;
|
|
}
|
|
}
|
|
|
|
/* The key already matches in all other cases */
|
|
if (op == MDB_SET_RANGE)
|
|
MDB_SET_KEY(leaf, key);
|
|
DPRINTF("==> cursor placed on key [%s]", DKEY(key));
|
|
|
|
return rc;
|
|
}
|
|
|
|
static int
|
|
mdb_cursor_first(MDB_cursor *mc, MDB_val *key, MDB_val *data)
|
|
{
|
|
int rc;
|
|
MDB_node *leaf;
|
|
|
|
rc = mdb_search_page(mc, NULL, 0);
|
|
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;
|
|
|
|
if (IS_LEAF2(mc->mc_pg[mc->mc_top])) {
|
|
key->mv_size = mc->mc_txn->mt_dbs[mc->mc_dbi].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 (mc->mc_xcursor)
|
|
mc->mc_xcursor->mx_cursor.mc_flags = 0;
|
|
if ((rc = mdb_read_data(mc->mc_txn, leaf, data)) != MDB_SUCCESS)
|
|
return rc;
|
|
}
|
|
}
|
|
MDB_SET_KEY(leaf, key);
|
|
return MDB_SUCCESS;
|
|
}
|
|
|
|
static int
|
|
mdb_cursor_last(MDB_cursor *mc, MDB_val *key, MDB_val *data)
|
|
{
|
|
int rc;
|
|
MDB_node *leaf;
|
|
MDB_val lkey;
|
|
|
|
lkey.mv_size = MAXKEYSIZE+1;
|
|
lkey.mv_data = NULL;
|
|
|
|
rc = mdb_search_page(mc, &lkey, 0);
|
|
if (rc != MDB_SUCCESS)
|
|
return rc;
|
|
assert(IS_LEAF(mc->mc_pg[mc->mc_top]));
|
|
|
|
leaf = NODEPTR(mc->mc_pg[mc->mc_top], NUMKEYS(mc->mc_pg[mc->mc_top])-1);
|
|
mc->mc_flags |= C_INITIALIZED;
|
|
mc->mc_flags &= ~C_EOF;
|
|
|
|
mc->mc_ki[mc->mc_top] = NUMKEYS(mc->mc_pg[mc->mc_top]) - 1;
|
|
|
|
if (IS_LEAF2(mc->mc_pg[mc->mc_top])) {
|
|
key->mv_size = mc->mc_txn->mt_dbs[mc->mc_dbi].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_read_data(mc->mc_txn, leaf, data)) != MDB_SUCCESS)
|
|
return rc;
|
|
}
|
|
}
|
|
|
|
MDB_SET_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;
|
|
|
|
assert(mc);
|
|
|
|
switch (op) {
|
|
case MDB_GET_BOTH:
|
|
case MDB_GET_BOTH_RANGE:
|
|
if (data == NULL || mc->mc_xcursor == NULL) {
|
|
rc = EINVAL;
|
|
break;
|
|
}
|
|
/* FALLTHRU */
|
|
case MDB_SET:
|
|
case MDB_SET_RANGE:
|
|
if (key == NULL || key->mv_size == 0 || key->mv_size > MAXKEYSIZE) {
|
|
rc = EINVAL;
|
|
} 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_txn->mt_dbs[mc->mc_dbi].md_flags & MDB_DUPFIXED) ||
|
|
!(mc->mc_flags & C_INITIALIZED)) {
|
|
rc = EINVAL;
|
|
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 ||
|
|
!(mc->mc_txn->mt_dbs[mc->mc_dbi].md_flags & MDB_DUPFIXED)) {
|
|
rc = EINVAL;
|
|
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_txn->mt_dbs[mx->mc_dbi].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) || (mc->mc_flags & C_EOF))
|
|
rc = mdb_cursor_last(mc, key, data);
|
|
else
|
|
rc = mdb_cursor_prev(mc, key, data, op);
|
|
break;
|
|
case MDB_FIRST:
|
|
rc = mdb_cursor_first(mc, key, data);
|
|
break;
|
|
case MDB_FIRST_DUP:
|
|
if (data == NULL ||
|
|
!(mc->mc_txn->mt_dbs[mc->mc_dbi].md_flags & MDB_DUPSORT) ||
|
|
!(mc->mc_flags & C_INITIALIZED) ||
|
|
!(mc->mc_xcursor->mx_cursor.mc_flags & C_INITIALIZED)) {
|
|
rc = EINVAL;
|
|
break;
|
|
}
|
|
rc = mdb_cursor_first(&mc->mc_xcursor->mx_cursor, data, NULL);
|
|
break;
|
|
case MDB_LAST:
|
|
rc = mdb_cursor_last(mc, key, data);
|
|
break;
|
|
case MDB_LAST_DUP:
|
|
if (data == NULL ||
|
|
!(mc->mc_txn->mt_dbs[mc->mc_dbi].md_flags & MDB_DUPSORT) ||
|
|
!(mc->mc_flags & C_INITIALIZED) ||
|
|
!(mc->mc_xcursor->mx_cursor.mc_flags & C_INITIALIZED)) {
|
|
rc = EINVAL;
|
|
break;
|
|
}
|
|
rc = mdb_cursor_last(&mc->mc_xcursor->mx_cursor, data, NULL);
|
|
break;
|
|
default:
|
|
DPRINTF("unhandled/unimplemented cursor operation %u", op);
|
|
rc = EINVAL;
|
|
break;
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
static int
|
|
mdb_cursor_touch(MDB_cursor *mc)
|
|
{
|
|
int rc;
|
|
|
|
if (mc->mc_dbi > MAIN_DBI && !mc->mc_txn->mt_dbxs[mc->mc_dbi].md_dirty) {
|
|
MDB_cursor mc2;
|
|
mc2.mc_txn = mc->mc_txn;
|
|
mc2.mc_dbi = MAIN_DBI;
|
|
rc = mdb_search_page(&mc2, &mc->mc_txn->mt_dbxs[mc->mc_dbi].md_name, 1);
|
|
if (rc) return rc;
|
|
mc->mc_txn->mt_dbxs[mc->mc_dbi].md_dirty = 1;
|
|
}
|
|
for (mc->mc_top = 0; mc->mc_top < mc->mc_snum; mc->mc_top++) {
|
|
if (!F_ISSET(mc->mc_pg[mc->mc_top]->mp_flags, P_DIRTY)) {
|
|
rc = mdb_touch(mc);
|
|
if (rc) return rc;
|
|
if (!mc->mc_top) {
|
|
mc->mc_txn->mt_dbs[mc->mc_dbi].md_root =
|
|
mc->mc_pg[mc->mc_top]->mp_pgno;
|
|
}
|
|
}
|
|
}
|
|
mc->mc_top = mc->mc_snum-1;
|
|
return MDB_SUCCESS;
|
|
}
|
|
|
|
int
|
|
mdb_cursor_put(MDB_cursor *mc, MDB_val *key, MDB_val *data,
|
|
unsigned int flags)
|
|
{
|
|
MDB_node *leaf;
|
|
MDB_val xdata, *rdata, dkey;
|
|
MDB_db dummy;
|
|
char dbuf[PAGESIZE];
|
|
int do_sub = 0;
|
|
size_t nsize;
|
|
DKBUF;
|
|
int rc, rc2;
|
|
|
|
if (F_ISSET(mc->mc_txn->mt_flags, MDB_TXN_RDONLY))
|
|
return EACCES;
|
|
|
|
DPRINTF("==> put db %u key [%s], size %zu, data size %zu",
|
|
mc->mc_dbi, DKEY(key), key->mv_size, 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_txn->mt_dbs[mc->mc_dbi].md_root == P_INVALID) {
|
|
MDB_page *np;
|
|
/* new database, write a root leaf page */
|
|
DPUTS("allocating new root leaf page");
|
|
if ((np = mdb_new_page(mc, P_LEAF, 1)) == NULL) {
|
|
return ENOMEM;
|
|
}
|
|
mc->mc_snum = 0;
|
|
cursor_push_page(mc, np);
|
|
mc->mc_txn->mt_dbs[mc->mc_dbi].md_root = np->mp_pgno;
|
|
mc->mc_txn->mt_dbs[mc->mc_dbi].md_depth++;
|
|
mc->mc_txn->mt_dbxs[mc->mc_dbi].md_dirty = 1;
|
|
if ((mc->mc_txn->mt_dbs[mc->mc_dbi].md_flags & (MDB_DUPSORT|MDB_DUPFIXED))
|
|
== MDB_DUPFIXED)
|
|
np->mp_flags |= P_LEAF2;
|
|
mc->mc_flags |= C_INITIALIZED;
|
|
rc = MDB_NOTFOUND;
|
|
goto top;
|
|
} else {
|
|
int exact = 0;
|
|
MDB_val d2;
|
|
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;
|
|
}
|
|
|
|
/* Cursor is positioned, now make sure all pages are writable */
|
|
rc2 = mdb_cursor_touch(mc);
|
|
if (rc2) return rc2;
|
|
|
|
top:
|
|
/* 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_txn->mt_dbs[mc->mc_dbi].md_pad;
|
|
if (key->mv_size != ksize)
|
|
return EINVAL;
|
|
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_txn->mt_dbs[mc->mc_dbi].md_flags, MDB_DUPSORT)) {
|
|
/* Was a single item before, must convert now */
|
|
if (!F_ISSET(leaf->mn_flags, F_DUPDATA)) {
|
|
dkey.mv_size = NODEDSZ(leaf);
|
|
dkey.mv_data = dbuf;
|
|
memcpy(dbuf, NODEDATA(leaf), dkey.mv_size);
|
|
/* data matches, ignore it */
|
|
if (!mdb_dcmp(mc->mc_txn, mc->mc_dbi, data, &dkey))
|
|
return (flags == MDB_NODUPDATA) ? MDB_KEYEXIST : MDB_SUCCESS;
|
|
memset(&dummy, 0, sizeof(dummy));
|
|
if (mc->mc_txn->mt_dbs[mc->mc_dbi].md_flags & MDB_DUPFIXED) {
|
|
dummy.md_pad = data->mv_size;
|
|
dummy.md_flags = MDB_DUPFIXED;
|
|
if (mc->mc_txn->mt_dbs[mc->mc_dbi].md_flags & MDB_INTEGERDUP)
|
|
dummy.md_flags |= MDB_INTEGERKEY;
|
|
}
|
|
dummy.md_root = P_INVALID;
|
|
if (dkey.mv_size == sizeof(MDB_db)) {
|
|
memcpy(NODEDATA(leaf), &dummy, sizeof(dummy));
|
|
goto put_sub;
|
|
}
|
|
mdb_del_node(mc->mc_pg[mc->mc_top], mc->mc_ki[mc->mc_top], 0);
|
|
do_sub = 1;
|
|
rdata = &xdata;
|
|
xdata.mv_size = sizeof(MDB_db);
|
|
xdata.mv_data = &dummy;
|
|
/* new sub-DB, must fully init xcursor */
|
|
if (flags == MDB_CURRENT)
|
|
flags = 0;
|
|
goto new_sub;
|
|
}
|
|
goto put_sub;
|
|
}
|
|
/* same size, just replace it */
|
|
if (!F_ISSET(leaf->mn_flags, F_BIGDATA) &&
|
|
NODEDSZ(leaf) == data->mv_size) {
|
|
memcpy(NODEDATA(leaf), data->mv_data, data->mv_size);
|
|
goto done;
|
|
}
|
|
mdb_del_node(mc->mc_pg[mc->mc_top], mc->mc_ki[mc->mc_top], 0);
|
|
} else {
|
|
DPRINTF("inserting key at index %i", mc->mc_ki[mc->mc_top]);
|
|
}
|
|
|
|
rdata = data;
|
|
|
|
new_sub:
|
|
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) {
|
|
rc = mdb_split(mc, key, rdata, P_INVALID);
|
|
} else {
|
|
/* There is room already in this leaf page. */
|
|
rc = mdb_add_node(mc, mc->mc_ki[mc->mc_top], key, rdata, 0, 0);
|
|
}
|
|
|
|
if (rc != MDB_SUCCESS)
|
|
mc->mc_txn->mt_flags |= MDB_TXN_ERROR;
|
|
else {
|
|
/* Remember if we just added a subdatabase */
|
|
if (flags & F_SUBDATA) {
|
|
leaf = NODEPTR(mc->mc_pg[mc->mc_top], mc->mc_ki[mc->mc_top]);
|
|
leaf->mn_flags |= F_SUBDATA;
|
|
}
|
|
|
|
/* 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) {
|
|
leaf = NODEPTR(mc->mc_pg[mc->mc_top], mc->mc_ki[mc->mc_top]);
|
|
put_sub:
|
|
if (flags == MDB_CURRENT)
|
|
mdb_xcursor_init2(mc);
|
|
else
|
|
mdb_xcursor_init1(mc, leaf);
|
|
xdata.mv_size = 0;
|
|
xdata.mv_data = "";
|
|
if (flags == MDB_NODUPDATA)
|
|
flags = MDB_NOOVERWRITE;
|
|
/* converted, write the original data first */
|
|
if (dkey.mv_size) {
|
|
rc = mdb_cursor_put(&mc->mc_xcursor->mx_cursor, &dkey, &xdata, flags);
|
|
if (rc) return rc;
|
|
leaf->mn_flags |= F_DUPDATA;
|
|
}
|
|
rc = mdb_cursor_put(&mc->mc_xcursor->mx_cursor, data, &xdata, flags);
|
|
mdb_xcursor_fini(mc);
|
|
memcpy(NODEDATA(leaf),
|
|
&mc->mc_xcursor->mx_txn.mt_dbs[mc->mc_xcursor->mx_cursor.mc_dbi],
|
|
sizeof(MDB_db));
|
|
}
|
|
mc->mc_txn->mt_dbs[mc->mc_dbi].md_entries++;
|
|
}
|
|
done:
|
|
return rc;
|
|
}
|
|
|
|
int
|
|
mdb_cursor_del(MDB_cursor *mc, unsigned int flags)
|
|
{
|
|
MDB_node *leaf;
|
|
int rc;
|
|
|
|
if (F_ISSET(mc->mc_txn->mt_flags, MDB_TXN_RDONLY))
|
|
return EACCES;
|
|
|
|
if (!mc->mc_flags & C_INITIALIZED)
|
|
return EINVAL;
|
|
|
|
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) {
|
|
mdb_xcursor_init2(mc);
|
|
rc = mdb_cursor_del(&mc->mc_xcursor->mx_cursor, 0);
|
|
mdb_xcursor_fini(mc);
|
|
/* If sub-DB still has entries, we're done */
|
|
if (mc->mc_xcursor->mx_txn.mt_dbs[mc->mc_xcursor->mx_cursor.mc_dbi].md_root
|
|
!= P_INVALID) {
|
|
memcpy(NODEDATA(leaf),
|
|
&mc->mc_xcursor->mx_txn.mt_dbs[mc->mc_xcursor->mx_cursor.mc_dbi],
|
|
sizeof(MDB_db));
|
|
mc->mc_txn->mt_dbs[mc->mc_dbi].md_entries--;
|
|
return rc;
|
|
}
|
|
/* otherwise fall thru and delete the sub-DB */
|
|
}
|
|
|
|
/* add all the child DB's pages to the free list */
|
|
rc = mdb_search_page(&mc->mc_xcursor->mx_cursor, NULL, 0);
|
|
if (rc == MDB_SUCCESS) {
|
|
MDB_node *ni;
|
|
MDB_cursor *mx;
|
|
unsigned int i;
|
|
|
|
mx = &mc->mc_xcursor->mx_cursor;
|
|
mc->mc_txn->mt_dbs[mc->mc_dbi].md_entries -=
|
|
mx->mc_txn->mt_dbs[mx->mc_dbi].md_entries;
|
|
|
|
cursor_pop_page(mx);
|
|
if (mx->mc_snum) {
|
|
while (mx->mc_snum > 1) {
|
|
for (i=0; i<NUMKEYS(mx->mc_pg[mx->mc_top]); i++) {
|
|
pgno_t pg;
|
|
ni = NODEPTR(mx->mc_pg[mx->mc_top], i);
|
|
pg = NODEPGNO(ni);
|
|
/* free it */
|
|
mdb_midl_append(mc->mc_txn->mt_free_pgs, pg);
|
|
}
|
|
rc = mdb_sibling(mx, 1);
|
|
if (rc) break;
|
|
}
|
|
}
|
|
/* free it */
|
|
mdb_midl_append(mc->mc_txn->mt_free_pgs,
|
|
mx->mc_txn->mt_dbs[mx->mc_dbi].md_root);
|
|
}
|
|
}
|
|
|
|
return mdb_del0(mc, leaf);
|
|
}
|
|
|
|
/* Allocate a page and initialize it
|
|
*/
|
|
static MDB_page *
|
|
mdb_new_page(MDB_cursor *mc, uint32_t flags, int num)
|
|
{
|
|
MDB_page *np;
|
|
|
|
if ((np = mdb_alloc_page(mc, num)) == NULL)
|
|
return NULL;
|
|
DPRINTF("allocated new mpage %lu, 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_txn->mt_dbs[mc->mc_dbi].md_branch_pages++;
|
|
else if (IS_LEAF(np))
|
|
mc->mc_txn->mt_dbs[mc->mc_dbi].md_leaf_pages++;
|
|
else if (IS_OVERFLOW(np)) {
|
|
mc->mc_txn->mt_dbs[mc->mc_dbi].md_overflow_pages += num;
|
|
np->mp_pages = num;
|
|
}
|
|
|
|
return np;
|
|
}
|
|
|
|
static size_t
|
|
mdb_leaf_size(MDB_env *env, MDB_val *key, MDB_val *data)
|
|
{
|
|
size_t sz;
|
|
|
|
sz = LEAFSIZE(key, data);
|
|
if (data->mv_size >= env->me_psize / MDB_MINKEYS) {
|
|
/* put on overflow page */
|
|
sz -= data->mv_size - sizeof(pgno_t);
|
|
}
|
|
sz += sz & 1;
|
|
|
|
return sz + sizeof(indx_t);
|
|
}
|
|
|
|
static size_t
|
|
mdb_branch_size(MDB_env *env, MDB_val *key)
|
|
{
|
|
size_t sz;
|
|
|
|
sz = INDXSIZE(key);
|
|
if (sz >= env->me_psize / MDB_MINKEYS) {
|
|
/* put on overflow page */
|
|
/* not implemented */
|
|
/* sz -= key->size - sizeof(pgno_t); */
|
|
}
|
|
|
|
return sz + sizeof(indx_t);
|
|
}
|
|
|
|
static int
|
|
mdb_add_node(MDB_cursor *mc, indx_t indx,
|
|
MDB_val *key, MDB_val *data, pgno_t pgno, uint8_t 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 page %lu index %i, data size %zu key size %zu [%s]",
|
|
IS_LEAF(mp) ? "leaf" : "branch",
|
|
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_txn->mt_dbs[mc->mc_dbi].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 (data->mv_size >= mc->mc_txn->mt_env->me_psize / MDB_MINKEYS) {
|
|
int ovpages = OVPAGES(data->mv_size, mc->mc_txn->mt_env->me_psize);
|
|
/* Put data on overflow page. */
|
|
DPRINTF("data size is %zu, put on overflow page",
|
|
data->mv_size);
|
|
node_size += sizeof(pgno_t);
|
|
if ((ofp = mdb_new_page(mc, P_OVERFLOW, ovpages)) == NULL)
|
|
return ENOMEM;
|
|
DPRINTF("allocated overflow page %lu", 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 %lu, 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 = %zu", node_size);
|
|
return ENOSPC;
|
|
}
|
|
|
|
/* 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
|
|
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));
|
|
memcpy(METADATA(ofp), data->mv_data, data->mv_size);
|
|
}
|
|
}
|
|
|
|
return MDB_SUCCESS;
|
|
}
|
|
|
|
static void
|
|
mdb_del_node(MDB_page *mp, indx_t indx, int ksize)
|
|
{
|
|
unsigned int sz;
|
|
indx_t i, j, numkeys, ptr;
|
|
MDB_node *node;
|
|
char *base;
|
|
|
|
DPRINTF("delete node %u on %s page %lu", indx,
|
|
IS_LEAF(mp) ? "leaf" : "branch", mp->mp_pgno);
|
|
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;
|
|
}
|
|
|
|
static void
|
|
mdb_xcursor_init0(MDB_cursor *mc)
|
|
{
|
|
MDB_xcursor *mx = mc->mc_xcursor;
|
|
MDB_dbi dbn;
|
|
|
|
mx->mx_txn = *mc->mc_txn;
|
|
mx->mx_txn.mt_dbxs = mx->mx_dbxs;
|
|
mx->mx_txn.mt_dbs = mx->mx_dbs;
|
|
mx->mx_dbxs[0] = mc->mc_txn->mt_dbxs[0];
|
|
mx->mx_dbxs[1] = mc->mc_txn->mt_dbxs[1];
|
|
if (mc->mc_dbi > 1) {
|
|
mx->mx_dbxs[2] = mc->mc_txn->mt_dbxs[mc->mc_dbi];
|
|
dbn = 2;
|
|
} else {
|
|
dbn = 1;
|
|
}
|
|
mx->mx_dbxs[dbn+1].md_parent = dbn;
|
|
mx->mx_dbxs[dbn+1].md_cmp = mx->mx_dbxs[dbn].md_dcmp;
|
|
mx->mx_dbxs[dbn+1].md_rel = mx->mx_dbxs[dbn].md_rel;
|
|
mx->mx_dbxs[dbn+1].md_dirty = 0;
|
|
mx->mx_txn.mt_numdbs = dbn+2;
|
|
mx->mx_txn.mt_u = mc->mc_txn->mt_u;
|
|
|
|
mx->mx_cursor.mc_xcursor = NULL;
|
|
mx->mx_cursor.mc_txn = &mx->mx_txn;
|
|
mx->mx_cursor.mc_dbi = dbn+1;
|
|
}
|
|
|
|
static void
|
|
mdb_xcursor_init1(MDB_cursor *mc, MDB_node *node)
|
|
{
|
|
MDB_db *db = NODEDATA(node);
|
|
MDB_xcursor *mx = mc->mc_xcursor;
|
|
MDB_dbi dbn;
|
|
mx->mx_dbs[0] = mc->mc_txn->mt_dbs[0];
|
|
mx->mx_dbs[1] = mc->mc_txn->mt_dbs[1];
|
|
if (mc->mc_dbi > 1) {
|
|
mx->mx_dbs[2] = mc->mc_txn->mt_dbs[mc->mc_dbi];
|
|
mx->mx_dbxs[2].md_dirty = mc->mc_txn->mt_dbxs[mc->mc_dbi].md_dirty;
|
|
dbn = 3;
|
|
} else {
|
|
dbn = 2;
|
|
}
|
|
DPRINTF("Sub-db %u for db %u root page %lu", dbn, mc->mc_dbi, db->md_root);
|
|
mx->mx_dbs[dbn] = *db;
|
|
if (F_ISSET(mc->mc_pg[mc->mc_top]->mp_flags, P_DIRTY))
|
|
mx->mx_dbxs[dbn].md_dirty = 1;
|
|
mx->mx_dbxs[dbn].md_name.mv_data = NODEKEY(node);
|
|
mx->mx_dbxs[dbn].md_name.mv_size = node->mn_ksize;
|
|
mx->mx_txn.mt_next_pgno = mc->mc_txn->mt_next_pgno;
|
|
mx->mx_cursor.mc_snum = 0;
|
|
mx->mx_cursor.mc_flags = 0;
|
|
}
|
|
|
|
static void
|
|
mdb_xcursor_init2(MDB_cursor *mc)
|
|
{
|
|
MDB_xcursor *mx = mc->mc_xcursor;
|
|
MDB_dbi dbn;
|
|
mx->mx_dbs[0] = mc->mc_txn->mt_dbs[0];
|
|
mx->mx_dbs[1] = mc->mc_txn->mt_dbs[1];
|
|
if (mc->mc_dbi > 1) {
|
|
mx->mx_dbs[2] = mc->mc_txn->mt_dbs[mc->mc_dbi];
|
|
mx->mx_dbxs[2].md_dirty = mc->mc_txn->mt_dbxs[mc->mc_dbi].md_dirty;
|
|
dbn = 3;
|
|
} else {
|
|
dbn = 2;
|
|
}
|
|
DPRINTF("Sub-db %u for db %u root page %lu", dbn, mc->mc_dbi,
|
|
mx->mx_dbs[dbn].md_root);
|
|
mx->mx_txn.mt_next_pgno = mc->mc_txn->mt_next_pgno;
|
|
}
|
|
|
|
static void
|
|
mdb_xcursor_fini(MDB_cursor *mc)
|
|
{
|
|
MDB_xcursor *mx = mc->mc_xcursor;
|
|
mc->mc_txn->mt_next_pgno = mx->mx_txn.mt_next_pgno;
|
|
mc->mc_txn->mt_dbs[0] = mx->mx_dbs[0];
|
|
mc->mc_txn->mt_dbs[1] = mx->mx_dbs[1];
|
|
if (mc->mc_dbi > 1) {
|
|
mc->mc_txn->mt_dbs[mc->mc_dbi] = mx->mx_dbs[2];
|
|
mc->mc_txn->mt_dbxs[mc->mc_dbi].md_dirty = mx->mx_dbxs[2].md_dirty;
|
|
}
|
|
}
|
|
|
|
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 || dbi >= txn->mt_numdbs)
|
|
return EINVAL;
|
|
|
|
if (txn->mt_dbs[dbi].md_flags & MDB_DUPSORT)
|
|
size += sizeof(MDB_xcursor);
|
|
|
|
if ((mc = calloc(1, size)) != NULL) {
|
|
mc->mc_dbi = dbi;
|
|
mc->mc_txn = txn;
|
|
if (txn->mt_dbs[dbi].md_flags & MDB_DUPSORT) {
|
|
MDB_xcursor *mx = (MDB_xcursor *)(mc + 1);
|
|
mc->mc_xcursor = mx;
|
|
mdb_xcursor_init0(mc);
|
|
}
|
|
} else {
|
|
return ENOMEM;
|
|
}
|
|
|
|
*ret = mc;
|
|
|
|
return MDB_SUCCESS;
|
|
}
|
|
|
|
/* Return the count of duplicate data items for the current key */
|
|
int
|
|
mdb_cursor_count(MDB_cursor *mc, unsigned long *countp)
|
|
{
|
|
MDB_node *leaf;
|
|
|
|
if (mc == NULL || countp == NULL)
|
|
return EINVAL;
|
|
|
|
if (!(mc->mc_txn->mt_dbs[mc->mc_dbi].md_flags & MDB_DUPSORT))
|
|
return EINVAL;
|
|
|
|
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_txn.mt_dbs[mc->mc_xcursor->mx_cursor.mc_dbi].md_entries;
|
|
}
|
|
return MDB_SUCCESS;
|
|
}
|
|
|
|
void
|
|
mdb_cursor_close(MDB_cursor *mc)
|
|
{
|
|
if (mc != NULL) {
|
|
free(mc);
|
|
}
|
|
}
|
|
|
|
static int
|
|
mdb_update_key(MDB_page *mp, indx_t indx, MDB_val *key)
|
|
{
|
|
indx_t ptr, i, numkeys;
|
|
int delta;
|
|
size_t len;
|
|
MDB_node *node;
|
|
char *base;
|
|
DKBUF;
|
|
|
|
node = NODEPTR(mp, indx);
|
|
ptr = mp->mp_ptrs[indx];
|
|
DPRINTF("update key %u (ofs %u) [%.*s] to [%s] on page %lu",
|
|
indx, ptr,
|
|
(int)node->mn_ksize, (char *)NODEKEY(node),
|
|
DKEY(key),
|
|
mp->mp_pgno);
|
|
|
|
delta = key->mv_size - node->mn_ksize;
|
|
if (delta) {
|
|
if (delta > 0 && SIZELEFT(mp) < delta) {
|
|
DPRINTF("OUCH! Not enough room, delta = %d", delta);
|
|
return ENOSPC;
|
|
}
|
|
|
|
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);
|
|
node->mn_ksize = key->mv_size;
|
|
}
|
|
|
|
memcpy(NODEKEY(node), key->mv_data, key->mv_size);
|
|
|
|
return MDB_SUCCESS;
|
|
}
|
|
|
|
/* Move a node from csrc to cdst.
|
|
*/
|
|
static int
|
|
mdb_move_node(MDB_cursor *csrc, MDB_cursor *cdst)
|
|
{
|
|
int rc;
|
|
MDB_node *srcnode;
|
|
MDB_val key, data;
|
|
DKBUF;
|
|
|
|
/* Mark src and dst as dirty. */
|
|
if ((rc = mdb_touch(csrc)) ||
|
|
(rc = mdb_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_txn->mt_dbs[csrc->mc_dbi].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;
|
|
} else {
|
|
if (csrc->mc_ki[csrc->mc_top] == 0 && IS_BRANCH(csrc->mc_pg[csrc->mc_top])) {
|
|
unsigned int snum = csrc->mc_snum;
|
|
/* must find the lowest key below src */
|
|
mdb_search_page_root(csrc, NULL, 0);
|
|
srcnode = NODEPTR(csrc->mc_pg[csrc->mc_top], 0);
|
|
csrc->mc_snum = snum--;
|
|
csrc->mc_top = snum;
|
|
} else {
|
|
srcnode = NODEPTR(csrc->mc_pg[csrc->mc_top], csrc->mc_ki[csrc->mc_top]);
|
|
}
|
|
key.mv_size = NODEKSZ(srcnode);
|
|
key.mv_data = NODEKEY(srcnode);
|
|
data.mv_size = NODEDSZ(srcnode);
|
|
data.mv_data = NODEDATA(srcnode);
|
|
}
|
|
DPRINTF("moving %s node %u [%s] on page %lu to node %u on page %lu",
|
|
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_add_node(cdst, cdst->mc_ki[cdst->mc_top], &key, &data, NODEPGNO(srcnode),
|
|
srcnode->mn_flags);
|
|
if (rc != MDB_SUCCESS)
|
|
return rc;
|
|
|
|
/* Delete the node from the source page.
|
|
*/
|
|
mdb_del_node(csrc->mc_pg[csrc->mc_top], csrc->mc_ki[csrc->mc_top], key.mv_size);
|
|
|
|
/* 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], csrc->mc_ki[csrc->mc_top], key.mv_size);
|
|
} else {
|
|
srcnode = NODEPTR(csrc->mc_pg[csrc->mc_top], csrc->mc_ki[csrc->mc_top]);
|
|
key.mv_size = NODEKSZ(srcnode);
|
|
key.mv_data = NODEKEY(srcnode);
|
|
}
|
|
DPRINTF("update separator for source page %lu to [%s]",
|
|
csrc->mc_pg[csrc->mc_top]->mp_pgno, DKEY(&key));
|
|
if ((rc = mdb_update_key(csrc->mc_pg[csrc->mc_top-1], csrc->mc_ki[csrc->mc_top-1],
|
|
&key)) != MDB_SUCCESS)
|
|
return rc;
|
|
}
|
|
if (IS_BRANCH(csrc->mc_pg[csrc->mc_top])) {
|
|
MDB_val nullkey;
|
|
nullkey.mv_size = 0;
|
|
assert(mdb_update_key(csrc->mc_pg[csrc->mc_top], 0, &nullkey) == 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 %lu to [%s]",
|
|
cdst->mc_pg[cdst->mc_top]->mp_pgno, DKEY(&key));
|
|
if ((rc = mdb_update_key(cdst->mc_pg[cdst->mc_top-1], cdst->mc_ki[cdst->mc_top-1],
|
|
&key)) != MDB_SUCCESS)
|
|
return rc;
|
|
}
|
|
if (IS_BRANCH(cdst->mc_pg[cdst->mc_top])) {
|
|
MDB_val nullkey;
|
|
nullkey.mv_size = 0;
|
|
assert(mdb_update_key(cdst->mc_pg[cdst->mc_top], 0, &nullkey) == MDB_SUCCESS);
|
|
}
|
|
}
|
|
|
|
return MDB_SUCCESS;
|
|
}
|
|
|
|
static int
|
|
mdb_merge(MDB_cursor *csrc, MDB_cursor *cdst)
|
|
{
|
|
int rc;
|
|
indx_t i, j;
|
|
MDB_node *srcnode;
|
|
MDB_val key, data;
|
|
|
|
DPRINTF("merging page %lu into %lu", 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_touch(cdst)))
|
|
return rc;
|
|
|
|
/* Move all nodes from src to dst.
|
|
*/
|
|
j = NUMKEYS(cdst->mc_pg[cdst->mc_top]);
|
|
if (IS_LEAF2(csrc->mc_pg[csrc->mc_top])) {
|
|
key.mv_size = csrc->mc_txn->mt_dbs[csrc->mc_dbi].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_add_node(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);
|
|
|
|
key.mv_size = srcnode->mn_ksize;
|
|
key.mv_data = NODEKEY(srcnode);
|
|
data.mv_size = NODEDSZ(srcnode);
|
|
data.mv_data = NODEDATA(srcnode);
|
|
rc = mdb_add_node(cdst, j, &key, &data, NODEPGNO(srcnode), srcnode->mn_flags);
|
|
if (rc != MDB_SUCCESS)
|
|
return rc;
|
|
}
|
|
}
|
|
|
|
DPRINTF("dst page %lu 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_del_node(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;
|
|
if ((rc = mdb_update_key(csrc->mc_pg[csrc->mc_top-1], 0, &key)) != MDB_SUCCESS)
|
|
return rc;
|
|
}
|
|
|
|
mdb_midl_append(csrc->mc_txn->mt_free_pgs, csrc->mc_pg[csrc->mc_top]->mp_pgno);
|
|
if (IS_LEAF(csrc->mc_pg[csrc->mc_top]))
|
|
csrc->mc_txn->mt_dbs[csrc->mc_dbi].md_leaf_pages--;
|
|
else
|
|
csrc->mc_txn->mt_dbs[csrc->mc_dbi].md_branch_pages--;
|
|
cursor_pop_page(csrc);
|
|
|
|
return mdb_rebalance(csrc);
|
|
}
|
|
|
|
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_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];
|
|
}
|
|
}
|
|
|
|
static int
|
|
mdb_rebalance(MDB_cursor *mc)
|
|
{
|
|
MDB_node *node;
|
|
MDB_page *root;
|
|
int rc;
|
|
unsigned int ptop;
|
|
MDB_cursor mn;
|
|
|
|
DPRINTF("rebalancing %s page %lu (has %u keys, %.1f%% full)",
|
|
IS_LEAF(mc->mc_pg[mc->mc_top]) ? "leaf" : "branch",
|
|
mc->mc_pg[mc->mc_top]->mp_pgno, NUMKEYS(mc->mc_pg[mc->mc_top]), (float)PAGEFILL(mc->mc_txn->mt_env, mc->mc_pg[mc->mc_top]) / 10);
|
|
|
|
if (PAGEFILL(mc->mc_txn->mt_env, mc->mc_pg[mc->mc_top]) >= FILL_THRESHOLD) {
|
|
DPRINTF("no need to rebalance page %lu, above fill threshold",
|
|
mc->mc_pg[mc->mc_top]->mp_pgno);
|
|
return MDB_SUCCESS;
|
|
}
|
|
|
|
if (mc->mc_snum < 2) {
|
|
if (NUMKEYS(mc->mc_pg[mc->mc_top]) == 0) {
|
|
DPUTS("tree is completely empty");
|
|
mc->mc_txn->mt_dbs[mc->mc_dbi].md_root = P_INVALID;
|
|
mc->mc_txn->mt_dbs[mc->mc_dbi].md_depth = 0;
|
|
mc->mc_txn->mt_dbs[mc->mc_dbi].md_leaf_pages = 0;
|
|
mdb_midl_append(mc->mc_txn->mt_free_pgs, mc->mc_pg[mc->mc_top]->mp_pgno);
|
|
} else if (IS_BRANCH(mc->mc_pg[mc->mc_top]) && NUMKEYS(mc->mc_pg[mc->mc_top]) == 1) {
|
|
DPUTS("collapsing root page!");
|
|
mdb_midl_append(mc->mc_txn->mt_free_pgs, mc->mc_pg[mc->mc_top]->mp_pgno);
|
|
mc->mc_txn->mt_dbs[mc->mc_dbi].md_root = NODEPGNO(NODEPTR(mc->mc_pg[mc->mc_top], 0));
|
|
if ((rc = mdb_get_page(mc->mc_txn, mc->mc_txn->mt_dbs[mc->mc_dbi].md_root, &root)))
|
|
return rc;
|
|
mc->mc_txn->mt_dbs[mc->mc_dbi].md_depth--;
|
|
mc->mc_txn->mt_dbs[mc->mc_dbi].md_branch_pages--;
|
|
} 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]);
|
|
if ((rc = mdb_get_page(mc->mc_txn, NODEPGNO(node), &mn.mc_pg[mn.mc_top])))
|
|
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]);
|
|
if ((rc = mdb_get_page(mc->mc_txn, NODEPGNO(node), &mn.mc_pg[mn.mc_top])))
|
|
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 %lu (%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 at least two
|
|
* keys, move one key from it.
|
|
*
|
|
* Otherwise we should try to merge them.
|
|
*/
|
|
if (PAGEFILL(mc->mc_txn->mt_env, mn.mc_pg[mn.mc_top]) >= FILL_THRESHOLD && NUMKEYS(mn.mc_pg[mn.mc_top]) >= 2)
|
|
return mdb_move_node(&mn, mc);
|
|
else { /* FIXME: if (has_enough_room()) */
|
|
if (mc->mc_ki[ptop] == 0)
|
|
return mdb_merge(&mn, mc);
|
|
else
|
|
return mdb_merge(mc, &mn);
|
|
}
|
|
}
|
|
|
|
static int
|
|
mdb_del0(MDB_cursor *mc, MDB_node *leaf)
|
|
{
|
|
int rc;
|
|
|
|
/* add overflow pages to free list */
|
|
if (!IS_LEAF2(mc->mc_pg[mc->mc_top]) && F_ISSET(leaf->mn_flags, F_BIGDATA)) {
|
|
int i, ovpages;
|
|
pgno_t pg;
|
|
|
|
memcpy(&pg, NODEDATA(leaf), sizeof(pg));
|
|
ovpages = OVPAGES(NODEDSZ(leaf), mc->mc_txn->mt_env->me_psize);
|
|
for (i=0; i<ovpages; i++) {
|
|
DPRINTF("freed ov page %lu", pg);
|
|
mdb_midl_append(mc->mc_txn->mt_free_pgs, pg);
|
|
pg++;
|
|
}
|
|
}
|
|
mdb_del_node(mc->mc_pg[mc->mc_top], mc->mc_ki[mc->mc_top], mc->mc_txn->mt_dbs[mc->mc_dbi].md_pad);
|
|
mc->mc_txn->mt_dbs[mc->mc_dbi].md_entries--;
|
|
rc = mdb_rebalance(mc);
|
|
if (rc != MDB_SUCCESS)
|
|
mc->mc_txn->mt_flags |= MDB_TXN_ERROR;
|
|
|
|
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)
|
|
return EINVAL;
|
|
|
|
if (F_ISSET(txn->mt_flags, MDB_TXN_RDONLY)) {
|
|
return EACCES;
|
|
}
|
|
|
|
if (key->mv_size == 0 || key->mv_size > MAXKEYSIZE) {
|
|
return EINVAL;
|
|
}
|
|
|
|
mc.mc_txn = txn;
|
|
mc.mc_dbi = dbi;
|
|
mc.mc_flags = 0;
|
|
if (txn->mt_dbs[dbi].md_flags & MDB_DUPSORT) {
|
|
mc.mc_xcursor = &mx;
|
|
mdb_xcursor_init0(&mc);
|
|
} else {
|
|
mc.mc_xcursor = NULL;
|
|
}
|
|
|
|
exact = 0;
|
|
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)
|
|
rc = mdb_cursor_del(&mc, data ? 0 : MDB_NODUPDATA);
|
|
return rc;
|
|
}
|
|
|
|
/* Split page <mc->top>, and insert <key,(data|newpgno)> in either left or
|
|
* right sibling, at index <mc->ki> (as if unsplit). Updates mc->top and
|
|
* mc->ki with the actual values after split, ie if mc->top and mc->ki
|
|
* refer to a node in the new right sibling page.
|
|
*/
|
|
static int
|
|
mdb_split(MDB_cursor *mc, MDB_val *newkey, MDB_val *newdata, pgno_t newpgno)
|
|
{
|
|
uint8_t flags;
|
|
int rc = MDB_SUCCESS, ins_new = 0;
|
|
indx_t newindx;
|
|
pgno_t pgno = 0;
|
|
unsigned int i, j, split_indx, nkeys, pmax;
|
|
MDB_node *node;
|
|
MDB_val sepkey, rkey, rdata;
|
|
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 %lu and adding [%s] at index %i",
|
|
IS_LEAF(mp) ? "leaf" : "branch", mp->mp_pgno,
|
|
DKEY(newkey), mc->mc_ki[mc->mc_top]);
|
|
|
|
if (mc->mc_snum < 2) {
|
|
if ((pp = mdb_new_page(mc, P_BRANCH, 1)) == NULL)
|
|
return ENOMEM;
|
|
/* 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_txn->mt_dbs[mc->mc_dbi].md_root = pp->mp_pgno;
|
|
DPRINTF("root split! new root = %lu", pp->mp_pgno);
|
|
mc->mc_txn->mt_dbs[mc->mc_dbi].md_depth++;
|
|
|
|
/* Add left (implicit) pointer. */
|
|
if ((rc = mdb_add_node(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_txn->mt_dbs[mc->mc_dbi].md_root = mp->mp_pgno;
|
|
mc->mc_txn->mt_dbs[mc->mc_dbi].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 %lu", mc->mc_pg[ptop]->mp_pgno);
|
|
}
|
|
|
|
/* Create a right sibling. */
|
|
if ((rp = mdb_new_page(mc, mp->mp_flags, 1)) == NULL)
|
|
return ENOMEM;
|
|
mdb_cursor_copy(mc, &mn);
|
|
mn.mc_pg[mn.mc_top] = rp;
|
|
mn.mc_ki[ptop] = mc->mc_ki[ptop]+1;
|
|
DPRINTF("new right sibling: page %lu", rp->mp_pgno);
|
|
|
|
nkeys = NUMKEYS(mp);
|
|
split_indx = nkeys / 2 + 1;
|
|
|
|
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_txn->mt_dbs[mc->mc_dbi].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 add_node can fail.
|
|
*/
|
|
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 (newindx < split_indx) {
|
|
psize = nsize;
|
|
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) {
|
|
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) {
|
|
split_indx = i+1;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/* First find the separating key between the split pages.
|
|
*/
|
|
if (newindx == split_indx) {
|
|
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--;
|
|
rc = mdb_split(&mn, &sepkey, NULL, rp->mp_pgno);
|
|
|
|
/* 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])) {
|
|
mc->mc_pg[ptop] = mn.mc_pg[ptop];
|
|
mc->mc_ki[ptop] = mn.mc_ki[ptop] - 1;
|
|
}
|
|
} else {
|
|
mn.mc_top--;
|
|
rc = mdb_add_node(&mn, mn.mc_ki[ptop], &sepkey, NULL, rp->mp_pgno, 0);
|
|
mn.mc_top++;
|
|
}
|
|
if (IS_LEAF2(rp)) {
|
|
return rc;
|
|
}
|
|
if (rc != MDB_SUCCESS) {
|
|
return rc;
|
|
}
|
|
|
|
/* Move half of the keys to the right sibling. */
|
|
|
|
/* grab a page to hold a temporary copy */
|
|
if (mc->mc_txn->mt_env->me_dpages) {
|
|
copy = mc->mc_txn->mt_env->me_dpages;
|
|
mc->mc_txn->mt_env->me_dpages = copy->mp_next;
|
|
} else {
|
|
if ((copy = malloc(mc->mc_txn->mt_env->me_psize)) == 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. */
|
|
j = (i == newindx && ins_new);
|
|
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.mv_data = newdata->mv_data;
|
|
rdata.mv_size = newdata->mv_size;
|
|
} else
|
|
pgno = newpgno;
|
|
flags = 0;
|
|
|
|
ins_new = 1;
|
|
|
|
/* Update page and 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)) {
|
|
rdata.mv_data = NODEDATA(node);
|
|
rdata.mv_size = NODEDSZ(node);
|
|
} 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_add_node(mc, j, &rkey, &rdata, pgno, flags);
|
|
}
|
|
|
|
/* reset back to original page */
|
|
if (newindx < split_indx)
|
|
mc->mc_pg[mc->mc_top] = mp;
|
|
|
|
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);
|
|
|
|
/* return tmp page to freelist */
|
|
copy->mp_next = mc->mc_txn->mt_env->me_dpages;
|
|
mc->mc_txn->mt_env->me_dpages = copy;
|
|
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)
|
|
return EINVAL;
|
|
|
|
if (F_ISSET(txn->mt_flags, MDB_TXN_RDONLY)) {
|
|
return EACCES;
|
|
}
|
|
|
|
if (key->mv_size == 0 || key->mv_size > MAXKEYSIZE) {
|
|
return EINVAL;
|
|
}
|
|
|
|
if ((flags & (MDB_NOOVERWRITE|MDB_NODUPDATA)) != flags)
|
|
return EINVAL;
|
|
|
|
mc.mc_txn = txn;
|
|
mc.mc_dbi = dbi;
|
|
mc.mc_snum = 0;
|
|
mc.mc_flags = 0;
|
|
if (txn->mt_dbs[dbi].md_flags & MDB_DUPSORT) {
|
|
mc.mc_xcursor = &mx;
|
|
mdb_xcursor_init0(&mc);
|
|
} else {
|
|
mc.mc_xcursor = NULL;
|
|
}
|
|
return mdb_cursor_put(&mc, key, data, flags);
|
|
}
|
|
|
|
int
|
|
mdb_env_set_flags(MDB_env *env, unsigned int flag, int onoff)
|
|
{
|
|
/** 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)
|
|
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;
|
|
}
|
|
|
|
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;
|
|
|
|
mdb_env_read_meta(env, &toggle);
|
|
|
|
return mdb_stat0(env, &env->me_metas[toggle]->mm_dbs[MAIN_DBI], arg);
|
|
}
|
|
|
|
static void
|
|
mdb_default_cmp(MDB_txn *txn, MDB_dbi dbi)
|
|
{
|
|
if (txn->mt_dbs[dbi].md_flags & MDB_REVERSEKEY)
|
|
txn->mt_dbxs[dbi].md_cmp = memnrcmp;
|
|
else if (txn->mt_dbs[dbi].md_flags & MDB_INTEGERKEY)
|
|
txn->mt_dbxs[dbi].md_cmp = cintcmp;
|
|
else
|
|
txn->mt_dbxs[dbi].md_cmp = memncmp;
|
|
|
|
if (txn->mt_dbs[dbi].md_flags & MDB_DUPSORT) {
|
|
if (txn->mt_dbs[dbi].md_flags & MDB_INTEGERDUP) {
|
|
if (txn->mt_dbs[dbi].md_flags & MDB_DUPFIXED)
|
|
txn->mt_dbxs[dbi].md_dcmp = intcmp;
|
|
else
|
|
txn->mt_dbxs[dbi].md_dcmp = cintcmp;
|
|
} else if (txn->mt_dbs[dbi].md_flags & MDB_REVERSEDUP) {
|
|
txn->mt_dbxs[dbi].md_dcmp = memnrcmp;
|
|
} else {
|
|
txn->mt_dbxs[dbi].md_dcmp = memncmp;
|
|
}
|
|
} else {
|
|
txn->mt_dbxs[dbi].md_dcmp = NULL;
|
|
}
|
|
}
|
|
|
|
int mdb_open(MDB_txn *txn, const char *name, unsigned int flags, MDB_dbi *dbi)
|
|
{
|
|
MDB_val key, data;
|
|
MDB_dbi i;
|
|
int rc, dirty = 0;
|
|
size_t len;
|
|
|
|
if (txn->mt_dbxs[FREE_DBI].md_cmp == NULL) {
|
|
mdb_default_cmp(txn, FREE_DBI);
|
|
}
|
|
|
|
/* main DB? */
|
|
if (!name) {
|
|
*dbi = MAIN_DBI;
|
|
if (flags & (MDB_DUPSORT|MDB_REVERSEKEY|MDB_INTEGERKEY))
|
|
txn->mt_dbs[MAIN_DBI].md_flags |= (flags & (MDB_DUPSORT|MDB_REVERSEKEY|MDB_INTEGERKEY));
|
|
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 (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 (txn->mt_numdbs >= txn->mt_env->me_maxdbs - 1)
|
|
return ENFILE;
|
|
|
|
/* Find the DB info */
|
|
key.mv_size = len;
|
|
key.mv_data = (void *)name;
|
|
rc = mdb_get(txn, MAIN_DBI, &key, &data);
|
|
|
|
/* Create if requested */
|
|
if (rc == MDB_NOTFOUND && (flags & MDB_CREATE)) {
|
|
MDB_cursor mc;
|
|
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 & 0xffff;
|
|
mc.mc_txn = txn;
|
|
mc.mc_dbi = MAIN_DBI;
|
|
mc.mc_flags = 0;
|
|
rc = mdb_cursor_put(&mc, &key, &data, F_SUBDATA);
|
|
dirty = 1;
|
|
}
|
|
|
|
/* OK, got info, add to table */
|
|
if (rc == MDB_SUCCESS) {
|
|
txn->mt_dbxs[txn->mt_numdbs].md_name.mv_data = strdup(name);
|
|
txn->mt_dbxs[txn->mt_numdbs].md_name.mv_size = len;
|
|
txn->mt_dbxs[txn->mt_numdbs].md_rel = NULL;
|
|
txn->mt_dbxs[txn->mt_numdbs].md_parent = MAIN_DBI;
|
|
txn->mt_dbxs[txn->mt_numdbs].md_dirty = dirty;
|
|
memcpy(&txn->mt_dbs[txn->mt_numdbs], data.mv_data, sizeof(MDB_db));
|
|
*dbi = txn->mt_numdbs;
|
|
txn->mt_env->me_dbs[0][txn->mt_numdbs] = txn->mt_dbs[txn->mt_numdbs];
|
|
txn->mt_env->me_dbs[1][txn->mt_numdbs] = txn->mt_dbs[txn->mt_numdbs];
|
|
mdb_default_cmp(txn, txn->mt_numdbs);
|
|
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;
|
|
|
|
return mdb_stat0(txn->mt_env, &txn->mt_dbs[dbi], arg);
|
|
}
|
|
|
|
void mdb_close(MDB_txn *txn, MDB_dbi dbi)
|
|
{
|
|
char *ptr;
|
|
if (dbi <= MAIN_DBI || dbi >= txn->mt_numdbs)
|
|
return;
|
|
ptr = txn->mt_dbxs[dbi].md_name.mv_data;
|
|
txn->mt_dbxs[dbi].md_name.mv_data = NULL;
|
|
txn->mt_dbxs[dbi].md_name.mv_size = 0;
|
|
free(ptr);
|
|
}
|
|
|
|
int mdb_set_compare(MDB_txn *txn, MDB_dbi dbi, MDB_cmp_func *cmp)
|
|
{
|
|
if (txn == NULL || !dbi || dbi >= txn->mt_numdbs)
|
|
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)
|
|
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)
|
|
return EINVAL;
|
|
|
|
txn->mt_dbxs[dbi].md_rel = rel;
|
|
return MDB_SUCCESS;
|
|
}
|
|
|
|
/** @} */
|
|
|