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3411 lines
84 KiB
3411 lines
84 KiB
/* mdb.c - memory-mapped database library */
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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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#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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#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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#include <pthread.h>
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#include "mdb.h"
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#define ULONG unsigned long
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typedef ULONG pgno_t;
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#include "midl.h"
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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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#ifndef DEBUG
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#define DEBUG 1
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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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# define DPRINTF(fmt, ...) /* Requires 2 or more args */ \
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fprintf(stderr, "%s:%d: " fmt "\n", __func__, __LINE__, __VA_ARGS__)
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#else
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# define DPRINTF(fmt, ...) ((void) 0)
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#endif
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#define DPUTS(arg) DPRINTF("%s", arg)
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#define PAGESIZE 4096
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#define MDB_MINKEYS 2
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#define MDB_MAGIC 0xBEEFC0DE
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#define MDB_VERSION 1
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#define MAXKEYSIZE 511
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#define P_INVALID (~0UL)
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#define F_ISSET(w, f) (((w) & (f)) == (f))
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typedef uint16_t indx_t;
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#define DEFAULT_READERS 126
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#define DEFAULT_MAPSIZE 1048576
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/* Lock descriptor stuff */
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#ifndef CACHELINE
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#define CACHELINE 64 /* most CPUs. Itanium uses 128 */
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#endif
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typedef struct MDB_rxbody {
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ULONG mrb_txnid;
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pid_t mrb_pid;
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pthread_t mrb_tid;
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} MDB_rxbody;
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typedef struct MDB_reader {
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union {
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MDB_rxbody mrx;
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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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typedef struct MDB_txbody {
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uint32_t mtb_magic;
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uint32_t mtb_version;
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pthread_mutex_t mtb_mutex;
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ULONG mtb_txnid;
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uint32_t mtb_numreaders;
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uint32_t mtb_me_toggle;
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} MDB_txbody;
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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_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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pthread_mutex_t mt2_wmutex;
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#define mti_wmutex mt2.mt2_wmutex
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char pad[(sizeof(pthread_mutex_t)+CACHELINE-1) & ~(CACHELINE-1)];
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} mt2;
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MDB_reader mti_readers[1];
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} MDB_txninfo;
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/* Common header for all page types. Overflow pages
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* occupy a number of contiguous pages with no
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* headers on any page after the first.
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*/
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typedef struct MDB_page { /* represents a page of storage */
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#define mp_pgno mp_p.p_pgno
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union padded {
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pgno_t p_pgno; /* page number */
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void * p_align; /* for IL32P64 */
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} mp_p;
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#define P_BRANCH 0x01 /* branch page */
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#define P_LEAF 0x02 /* leaf page */
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#define P_OVERFLOW 0x04 /* overflow page */
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#define P_META 0x08 /* meta page */
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#define P_DIRTY 0x10 /* dirty page */
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#define P_LEAF2 0x20 /* DB with small, fixed size keys and no data */
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uint32_t mp_flags;
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#define mp_lower mp_pb.pb.pb_lower
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#define mp_upper mp_pb.pb.pb_upper
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#define mp_pages mp_pb.pb_pages
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union page_bounds {
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struct {
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indx_t pb_lower; /* lower bound of free space */
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indx_t pb_upper; /* upper bound of free space */
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} pb;
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uint32_t pb_pages; /* number of overflow pages */
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struct {
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indx_t pb_ksize; /* on a LEAF2 page */
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indx_t pb_numkeys;
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} pb2;
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} mp_pb;
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indx_t mp_ptrs[1]; /* dynamic size */
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} MDB_page;
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#define PAGEHDRSZ ((unsigned) offsetof(MDB_page, mp_ptrs))
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#define NUMKEYS(p) (((p)->mp_lower - PAGEHDRSZ) >> 1)
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#define SIZELEFT(p) (indx_t)((p)->mp_upper - (p)->mp_lower)
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#define PAGEFILL(env, p) (1000L * ((env)->me_psize - PAGEHDRSZ - SIZELEFT(p)) / \
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((env)->me_psize - PAGEHDRSZ))
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#define IS_LEAF(p) F_ISSET((p)->mp_flags, P_LEAF)
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#define IS_BRANCH(p) F_ISSET((p)->mp_flags, P_BRANCH)
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#define IS_OVERFLOW(p) F_ISSET((p)->mp_flags, P_OVERFLOW)
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#define OVPAGES(size, psize) ((PAGEHDRSZ-1 + (size)) / (psize) + 1)
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typedef struct MDB_db {
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uint32_t md_pad;
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uint16_t md_flags;
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uint16_t md_depth;
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ULONG md_branch_pages;
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ULONG md_leaf_pages;
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ULONG md_overflow_pages;
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ULONG md_entries;
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pgno_t md_root;
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} MDB_db;
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#define FREE_DBI 0
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#define MAIN_DBI 1
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typedef struct MDB_meta { /* meta (footer) page content */
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uint32_t mm_magic;
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uint32_t mm_version;
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void *mm_address; /* address for fixed mapping */
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size_t mm_mapsize; /* size of mmap region */
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MDB_db mm_dbs[2]; /* first is free space, 2nd is main db */
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#define mm_psize mm_dbs[0].md_pad
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#define mm_flags mm_dbs[0].md_flags
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pgno_t mm_last_pg; /* last used page in file */
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ULONG mm_txnid; /* txnid that committed this page */
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} MDB_meta;
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typedef struct MDB_dhead { /* a dirty page */
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MDB_page *md_parent;
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unsigned md_pi; /* parent index */
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int md_num;
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} MDB_dhead;
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typedef struct MDB_dpage {
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MDB_dhead h;
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MDB_page p;
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} MDB_dpage;
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typedef struct MDB_oldpages {
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struct MDB_oldpages *mo_next;
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ULONG mo_txnid;
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pgno_t mo_pages[1]; /* dynamic */
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} MDB_oldpages;
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typedef struct MDB_pageparent {
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MDB_page *mp_page;
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MDB_page *mp_parent;
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unsigned mp_pi;
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} MDB_pageparent;
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static MDB_dpage *mdb_alloc_page(MDB_txn *txn, MDB_page *parent, unsigned int parent_idx, int num);
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static int mdb_touch(MDB_txn *txn, MDB_pageparent *mp);
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typedef struct MDB_ppage { /* ordered list of pages */
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MDB_page *mp_page;
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unsigned int mp_ki; /* cursor index on page */
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} MDB_ppage;
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#define CURSOR_TOP(c) (&(c)->mc_stack[(c)->mc_snum-1])
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#define CURSOR_PARENT(c) (&(c)->mc_stack[(c)->mc_snum-2])
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struct MDB_xcursor;
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struct MDB_cursor {
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MDB_txn *mc_txn;
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MDB_ppage mc_stack[32]; /* stack of parent pages */
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unsigned int mc_snum; /* number of pushed pages */
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MDB_dbi mc_dbi;
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short mc_initialized; /* 1 if initialized */
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short mc_eof; /* 1 if end is reached */
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struct MDB_xcursor *mc_xcursor;
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};
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#define METADATA(p) ((void *)((char *)(p) + PAGEHDRSZ))
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typedef struct MDB_node {
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#define mn_pgno mn_p.np_pgno
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#define mn_dsize mn_p.np_dsize
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union {
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pgno_t np_pgno; /* child page number */
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uint32_t np_dsize; /* leaf data size */
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} mn_p;
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unsigned int mn_flags:4;
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unsigned int mn_ksize:12; /* key size */
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#define F_BIGDATA 0x01 /* data put on overflow page */
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#define F_SUBDATA 0x02 /* data is a sub-database */
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#define F_DUPDATA 0x04 /* data has duplicates */
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char mn_data[1];
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} MDB_node;
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typedef struct MDB_dbx {
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MDB_val md_name;
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MDB_cmp_func *md_cmp; /* user compare function */
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MDB_cmp_func *md_dcmp; /* user dupsort function */
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MDB_rel_func *md_rel; /* user relocate function */
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MDB_dbi md_parent;
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unsigned int md_dirty;
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} MDB_dbx;
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struct MDB_txn {
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pgno_t mt_next_pgno; /* next unallocated page */
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ULONG mt_txnid;
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ULONG mt_oldest;
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MDB_env *mt_env;
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pgno_t *mt_free_pgs; /* this is an IDL */
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union {
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MIDL2 *dirty_list; /* modified pages */
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MDB_reader *reader;
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} mt_u;
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MDB_dbx *mt_dbxs; /* array */
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MDB_db *mt_dbs;
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unsigned int mt_numdbs;
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#define MDB_TXN_RDONLY 0x01 /* read-only transaction */
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#define MDB_TXN_ERROR 0x02 /* an error has occurred */
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#define MDB_TXN_METOGGLE 0x04 /* used meta page 1 */
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unsigned int mt_flags;
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};
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/* Context for sorted-dup records */
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typedef struct MDB_xcursor {
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MDB_cursor mx_cursor;
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MDB_txn mx_txn;
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MDB_dbx mx_dbxs[4];
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MDB_db mx_dbs[4];
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} MDB_xcursor;
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struct MDB_env {
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int me_fd;
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int me_lfd;
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int me_mfd; /* just for writing the meta pages */
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#define MDB_FATAL_ERROR 0x80000000U
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uint32_t me_flags;
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uint32_t me_extrapad; /* unused for now */
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unsigned int me_maxreaders;
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unsigned int me_numdbs;
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unsigned int me_maxdbs;
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char *me_path;
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char *me_map;
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MDB_txninfo *me_txns;
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MDB_meta *me_metas[2];
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MDB_meta *me_meta;
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MDB_txn *me_txn; /* current write transaction */
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size_t me_mapsize;
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off_t me_size; /* current file size */
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pgno_t me_maxpg; /* me_mapsize / me_psize */
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unsigned int me_psize;
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unsigned int me_db_toggle;
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MDB_dbx *me_dbxs; /* array */
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MDB_db *me_dbs[2];
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MDB_oldpages *me_pghead;
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pthread_key_t me_txkey; /* thread-key for readers */
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MDB_dpage *me_dpages;
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pgno_t me_free_pgs[MDB_IDL_UM_SIZE];
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MIDL2 me_dirty_list[MDB_IDL_DB_SIZE];
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};
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#define NODESIZE offsetof(MDB_node, mn_data)
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#define INDXSIZE(k) (NODESIZE + ((k) == NULL ? 0 : (k)->mv_size))
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#define LEAFSIZE(k, d) (NODESIZE + (k)->mv_size + (d)->mv_size)
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#define NODEPTR(p, i) ((MDB_node *)((char *)(p) + (p)->mp_ptrs[i]))
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#define NODEKEY(node) (void *)((node)->mn_data)
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#define NODEDATA(node) (void *)((char *)(node)->mn_data + (node)->mn_ksize)
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#define NODEPGNO(node) ((node)->mn_pgno)
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#define NODEDSZ(node) ((node)->mn_dsize)
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#define MDB_COMMIT_PAGES 64 /* max number of pages to write in one commit */
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static int mdb_search_page_root(MDB_txn *txn,
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MDB_dbi dbi, MDB_val *key,
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MDB_cursor *cursor, int modify,
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MDB_pageparent *mpp);
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static int mdb_search_page(MDB_txn *txn,
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MDB_dbi dbi, MDB_val *key,
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MDB_cursor *cursor, int modify,
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MDB_pageparent *mpp);
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static int mdb_env_read_header(MDB_env *env, MDB_meta *meta);
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static int mdb_env_read_meta(MDB_env *env, int *which);
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static int mdb_env_write_meta(MDB_txn *txn);
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static MDB_page *mdb_get_page(MDB_txn *txn, pgno_t pgno);
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static MDB_node *mdb_search_node(MDB_txn *txn, MDB_dbi dbi, MDB_page *mp,
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MDB_val *key, int *exactp, unsigned int *kip);
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static int mdb_add_node(MDB_txn *txn, MDB_dbi dbi, MDB_page *mp,
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indx_t indx, MDB_val *key, MDB_val *data,
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pgno_t pgno, uint8_t flags);
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static void mdb_del_node(MDB_page *mp, indx_t indx);
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static int mdb_del0(MDB_txn *txn, MDB_dbi dbi, unsigned int ki,
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MDB_pageparent *mpp, MDB_node *leaf);
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static int mdb_put0(MDB_txn *txn, MDB_dbi dbi,
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MDB_val *key, MDB_val *data, unsigned int flags);
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static int mdb_read_data(MDB_txn *txn, MDB_node *leaf, MDB_val *data);
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static int mdb_rebalance(MDB_txn *txn, MDB_dbi dbi, MDB_pageparent *mp);
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static int mdb_update_key(MDB_page *mp, indx_t indx, MDB_val *key);
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static int mdb_move_node(MDB_txn *txn, MDB_dbi dbi,
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MDB_pageparent *src, indx_t srcindx,
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MDB_pageparent *dst, indx_t dstindx);
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static int mdb_merge(MDB_txn *txn, MDB_dbi dbi, MDB_pageparent *src,
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MDB_pageparent *dst);
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static int mdb_split(MDB_txn *txn, MDB_dbi dbi, MDB_page **mpp,
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unsigned int *newindxp, MDB_val *newkey,
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MDB_val *newdata, pgno_t newpgno);
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static MDB_dpage *mdb_new_page(MDB_txn *txn, MDB_dbi dbi, uint32_t flags, int num);
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static void cursor_pop_page(MDB_cursor *cursor);
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static MDB_ppage *cursor_push_page(MDB_cursor *cursor,
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MDB_page *mp);
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static int mdb_set_key(MDB_node *node, MDB_val *key);
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static int mdb_sibling(MDB_cursor *cursor, int move_right);
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static int mdb_cursor_next(MDB_cursor *cursor,
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MDB_val *key, MDB_val *data, MDB_cursor_op op);
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static int mdb_cursor_prev(MDB_cursor *cursor,
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MDB_val *key, MDB_val *data, MDB_cursor_op op);
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static int mdb_cursor_set(MDB_cursor *cursor,
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MDB_val *key, MDB_val *data, MDB_cursor_op op, int *exactp);
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static int mdb_cursor_first(MDB_cursor *cursor,
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MDB_val *key, MDB_val *data);
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static int mdb_cursor_last(MDB_cursor *cursor,
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MDB_val *key, MDB_val *data);
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static void mdb_xcursor_init0(MDB_txn *txn, MDB_dbi dbi, MDB_xcursor *mx);
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static void mdb_xcursor_init1(MDB_txn *txn, MDB_dbi dbi, MDB_xcursor *mx, MDB_node *node);
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static void mdb_xcursor_fini(MDB_txn *txn, MDB_dbi dbi, MDB_xcursor *mx);
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static size_t mdb_leaf_size(MDB_env *env, MDB_val *key,
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MDB_val *data);
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static size_t mdb_branch_size(MDB_env *env, MDB_val *key);
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static int memncmp(const void *s1, size_t n1,
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const void *s2, size_t n2);
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static int memnrcmp(const void *s1, size_t n1,
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const void *s2, size_t n2);
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static int
|
|
memncmp(const void *s1, size_t n1, const void *s2, size_t n2)
|
|
{
|
|
int diff, len_diff = -1;
|
|
|
|
if (n1 >= n2) {
|
|
len_diff = (n1 > n2);
|
|
n1 = n2;
|
|
}
|
|
diff = memcmp(s1, s2, n1);
|
|
return diff ? diff : len_diff;
|
|
}
|
|
|
|
static int
|
|
memnrcmp(const void *s1, size_t n1, const void *s2, size_t n2)
|
|
{
|
|
const unsigned char *p1, *p2, *p1_lim;
|
|
|
|
if (n2 == 0)
|
|
return n1 != 0;
|
|
if (n1 == 0)
|
|
return -1;
|
|
|
|
p1 = (const unsigned char *)s1 + n1 - 1;
|
|
p2 = (const unsigned char *)s2 + n2 - 1;
|
|
|
|
for (p1_lim = (n1 <= n2 ? s1 : s2); *p1 == *p2; p1--, p2--) {
|
|
if (p1 == p1_lim)
|
|
return (p1 != s1) ? (p1 != p2) : (p2 != s2) ? -1 : 0;
|
|
}
|
|
return *p1 - *p2;
|
|
}
|
|
|
|
char *
|
|
mdb_version(int *maj, int *min, int *pat)
|
|
{
|
|
*maj = MDB_VERSION_MAJOR;
|
|
*min = MDB_VERSION_MINOR;
|
|
*pat = MDB_VERSION_PATCH;
|
|
return MDB_VERSION_STRING;
|
|
}
|
|
|
|
static char *const 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 errstr[err - MDB_KEYEXIST];
|
|
|
|
return strerror(err);
|
|
}
|
|
|
|
int
|
|
mdb_cmp(MDB_txn *txn, MDB_dbi dbi, const MDB_val *a, const MDB_val *b)
|
|
{
|
|
if (txn->mt_dbxs[dbi].md_cmp)
|
|
return txn->mt_dbxs[dbi].md_cmp(a, b);
|
|
|
|
if (txn->mt_dbs[dbi].md_flags & (MDB_REVERSEKEY
|
|
#if __BYTE_ORDER == __LITTLE_ENDIAN
|
|
|MDB_INTEGERKEY
|
|
#endif
|
|
))
|
|
return memnrcmp(a->mv_data, a->mv_size, b->mv_data, b->mv_size);
|
|
else
|
|
return memncmp((char *)a->mv_data, a->mv_size, b->mv_data, b->mv_size);
|
|
}
|
|
|
|
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);
|
|
|
|
return memncmp((char *)a->mv_data, a->mv_size, b->mv_data, b->mv_size);
|
|
}
|
|
|
|
/* Allocate new page(s) for writing */
|
|
static MDB_dpage *
|
|
mdb_alloc_page(MDB_txn *txn, MDB_page *parent, unsigned int parent_idx, int num)
|
|
{
|
|
MDB_dpage *dp;
|
|
pgno_t pgno = P_INVALID;
|
|
ULONG oldest;
|
|
MIDL2 mid;
|
|
|
|
if (txn->mt_txnid > 2) {
|
|
|
|
oldest = txn->mt_txnid - 2;
|
|
if (!txn->mt_env->me_pghead && txn->mt_dbs[FREE_DBI].md_root != P_INVALID) {
|
|
/* See if there's anything in the free DB */
|
|
MDB_pageparent mpp;
|
|
MDB_node *leaf;
|
|
ULONG *kptr;
|
|
|
|
mpp.mp_parent = NULL;
|
|
mpp.mp_pi = 0;
|
|
mdb_search_page(txn, FREE_DBI, NULL, NULL, 0, &mpp);
|
|
leaf = NODEPTR(mpp.mp_page, 0);
|
|
kptr = (ULONG *)NODEKEY(leaf);
|
|
|
|
/* It's potentially usable, unless there are still
|
|
* older readers outstanding. Grab it.
|
|
*/
|
|
if (oldest > *kptr) {
|
|
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 */
|
|
mpp.mp_parent = NULL;
|
|
mpp.mp_pi = 0;
|
|
mdb_search_page(txn, FREE_DBI, NULL, NULL, 1, &mpp);
|
|
leaf = NODEPTR(mpp.mp_page, 0);
|
|
mdb_del0(txn, FREE_DBI, 0, &mpp, leaf);
|
|
}
|
|
}
|
|
if (txn->mt_env->me_pghead) {
|
|
unsigned int i;
|
|
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) continue;
|
|
if (mr < oldest)
|
|
oldest = txn->mt_env->me_txns->mti_readers[i].mr_txnid;
|
|
}
|
|
if (oldest > txn->mt_env->me_pghead->mo_txnid) {
|
|
MDB_oldpages *mop = txn->mt_env->me_pghead;
|
|
txn->mt_oldest = oldest;
|
|
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) {
|
|
dp = txn->mt_env->me_dpages;
|
|
txn->mt_env->me_dpages = (MDB_dpage *)dp->h.md_parent;
|
|
} else {
|
|
if ((dp = malloc(txn->mt_env->me_psize * num + sizeof(MDB_dhead))) == NULL)
|
|
return NULL;
|
|
}
|
|
dp->h.md_num = num;
|
|
dp->h.md_parent = parent;
|
|
dp->h.md_pi = parent_idx;
|
|
if (pgno == P_INVALID) {
|
|
dp->p.mp_pgno = txn->mt_next_pgno;
|
|
txn->mt_next_pgno += num;
|
|
} else {
|
|
dp->p.mp_pgno = pgno;
|
|
}
|
|
mid.mid = dp->p.mp_pgno;
|
|
mid.mptr = dp;
|
|
mdb_midl2_insert(txn->mt_u.dirty_list, &mid);
|
|
|
|
return dp;
|
|
}
|
|
|
|
/* Touch a page: make it dirty and re-insert into tree with updated pgno.
|
|
*/
|
|
static int
|
|
mdb_touch(MDB_txn *txn, MDB_pageparent *pp)
|
|
{
|
|
MDB_page *mp = pp->mp_page;
|
|
pgno_t pgno;
|
|
assert(txn != NULL);
|
|
assert(pp != NULL);
|
|
|
|
if (!F_ISSET(mp->mp_flags, P_DIRTY)) {
|
|
MDB_dpage *dp;
|
|
if ((dp = mdb_alloc_page(txn, pp->mp_parent, pp->mp_pi, 1)) == NULL)
|
|
return ENOMEM;
|
|
DPRINTF("touched page %lu -> %lu", mp->mp_pgno, dp->p.mp_pgno);
|
|
mdb_midl_insert(txn->mt_free_pgs, mp->mp_pgno);
|
|
pgno = dp->p.mp_pgno;
|
|
memcpy(&dp->p, mp, txn->mt_env->me_psize);
|
|
mp = &dp->p;
|
|
mp->mp_pgno = pgno;
|
|
mp->mp_flags |= P_DIRTY;
|
|
|
|
/* Update the page number to new touched page. */
|
|
if (pp->mp_parent != NULL)
|
|
NODEPGNO(NODEPTR(pp->mp_parent, pp->mp_pi)) = mp->mp_pgno;
|
|
pp->mp_page = mp;
|
|
}
|
|
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 = errno;
|
|
}
|
|
return rc;
|
|
}
|
|
|
|
int
|
|
mdb_txn_begin(MDB_env *env, int rdonly, MDB_txn **ret)
|
|
{
|
|
MDB_txn *txn;
|
|
int rc, toggle;
|
|
|
|
if (env->me_flags & MDB_FATAL_ERROR) {
|
|
DPUTS("mdb_txn_begin: environment had fatal error, must shutdown!");
|
|
return MDB_PANIC;
|
|
}
|
|
if ((txn = calloc(1, sizeof(MDB_txn))) == NULL) {
|
|
DPRINTF("calloc: %s", strerror(errno));
|
|
return ENOMEM;
|
|
}
|
|
|
|
if (rdonly) {
|
|
txn->mt_flags |= MDB_TXN_RDONLY;
|
|
} else {
|
|
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;
|
|
|
|
pthread_mutex_lock(&env->me_txns->mti_wmutex);
|
|
env->me_txns->mti_txnid++;
|
|
}
|
|
|
|
txn->mt_txnid = env->me_txns->mti_txnid;
|
|
if (rdonly) {
|
|
MDB_reader *r = pthread_getspecific(env->me_txkey);
|
|
if (!r) {
|
|
unsigned int i;
|
|
pthread_mutex_lock(&env->me_txns->mti_mutex);
|
|
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) {
|
|
pthread_mutex_unlock(&env->me_txns->mti_mutex);
|
|
return ENOSPC;
|
|
}
|
|
env->me_txns->mti_readers[i].mr_pid = getpid();
|
|
env->me_txns->mti_readers[i].mr_tid = pthread_self();
|
|
r = &env->me_txns->mti_readers[i];
|
|
pthread_setspecific(env->me_txkey, r);
|
|
if (i >= env->me_txns->mti_numreaders)
|
|
env->me_txns->mti_numreaders = i+1;
|
|
pthread_mutex_unlock(&env->me_txns->mti_mutex);
|
|
}
|
|
r->mr_txnid = txn->mt_txnid;
|
|
txn->mt_u.reader = r;
|
|
} else {
|
|
env->me_txn = txn;
|
|
}
|
|
|
|
txn->mt_env = env;
|
|
|
|
toggle = env->me_txns->mti_me_toggle;
|
|
if ((rc = mdb_env_read_meta(env, &toggle)) != MDB_SUCCESS) {
|
|
mdb_txn_abort(txn);
|
|
return rc;
|
|
}
|
|
|
|
/* Copy the DB arrays */
|
|
txn->mt_numdbs = env->me_numdbs;
|
|
txn->mt_dbxs = env->me_dbxs; /* mostly static anyway */
|
|
txn->mt_dbs = malloc(env->me_maxdbs * sizeof(MDB_db));
|
|
memcpy(txn->mt_dbs, env->me_meta->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));
|
|
|
|
if (!rdonly) {
|
|
if (toggle)
|
|
txn->mt_flags |= MDB_TXN_METOGGLE;
|
|
txn->mt_next_pgno = env->me_meta->mm_last_pg+1;
|
|
}
|
|
|
|
DPRINTF("begin transaction %lu on mdbenv %p, root page %lu",
|
|
txn->mt_txnid, (void *) env, txn->mt_dbs[MAIN_DBI].md_root);
|
|
|
|
*ret = txn;
|
|
return MDB_SUCCESS;
|
|
}
|
|
|
|
void
|
|
mdb_txn_abort(MDB_txn *txn)
|
|
{
|
|
MDB_env *env;
|
|
|
|
if (txn == NULL)
|
|
return;
|
|
|
|
env = txn->mt_env;
|
|
DPRINTF("abort transaction %lu on mdbenv %p, root page %lu",
|
|
txn->mt_txnid, (void *) env, txn->mt_dbs[MAIN_DBI].md_root);
|
|
|
|
free(txn->mt_dbs);
|
|
|
|
if (F_ISSET(txn->mt_flags, MDB_TXN_RDONLY)) {
|
|
txn->mt_u.reader->mr_txnid = 0;
|
|
} else {
|
|
MDB_oldpages *mop;
|
|
MDB_dpage *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 (dp->h.md_num == 1) {
|
|
dp->h.md_parent = (MDB_page *)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;
|
|
env->me_txns->mti_txnid--;
|
|
for (i=2; i<env->me_numdbs; i++)
|
|
env->me_dbxs[i].md_dirty = 0;
|
|
pthread_mutex_unlock(&env->me_txns->mti_wmutex);
|
|
}
|
|
|
|
free(txn);
|
|
}
|
|
|
|
int
|
|
mdb_txn_commit(MDB_txn *txn)
|
|
{
|
|
int n, done;
|
|
unsigned int i;
|
|
ssize_t rc;
|
|
off_t size;
|
|
MDB_dpage *dp;
|
|
MDB_env *env;
|
|
pgno_t next;
|
|
struct iovec iov[MDB_COMMIT_PAGES];
|
|
|
|
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 transaction %lu on mdbenv %p, root page %lu",
|
|
txn->mt_txnid, (void *) env, txn->mt_dbs[MAIN_DBI].md_root);
|
|
|
|
/* 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_put0(txn, FREE_DBI, &key, &data, 0);
|
|
free(env->me_pghead);
|
|
env->me_pghead = NULL;
|
|
}
|
|
/* save to free list */
|
|
if (!MDB_IDL_IS_ZERO(txn->mt_free_pgs)) {
|
|
MDB_val key, data;
|
|
MDB_pageparent mpp;
|
|
|
|
/* make sure last page of freeDB is touched and on freelist */
|
|
key.mv_size = MAXKEYSIZE+1;
|
|
key.mv_data = NULL;
|
|
mpp.mp_parent = NULL;
|
|
mpp.mp_pi = 0;
|
|
mdb_search_page(txn, FREE_DBI, &key, NULL, 1, &mpp);
|
|
|
|
#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_size = MDB_IDL_SIZEOF(txn->mt_free_pgs);
|
|
data.mv_data = txn->mt_free_pgs;
|
|
mdb_put0(txn, FREE_DBI, &key, &data, 0);
|
|
}
|
|
|
|
/* 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);
|
|
|
|
for (i = 2; i < txn->mt_numdbs; i++) {
|
|
if (txn->mt_dbxs[i].md_dirty) {
|
|
data.mv_data = &txn->mt_dbs[i];
|
|
mdb_put0(txn, MAIN_DBI, &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 {
|
|
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->p.mp_pgno != next) {
|
|
if (n) {
|
|
DPRINTF("committing %u dirty pages", n);
|
|
rc = writev(env->me_fd, iov, n);
|
|
if (rc != size) {
|
|
n = errno;
|
|
if (rc > 0)
|
|
DPUTS("short write, filesystem full?");
|
|
else
|
|
DPRINTF("writev: %s", strerror(errno));
|
|
mdb_txn_abort(txn);
|
|
return n;
|
|
}
|
|
n = 0;
|
|
size = 0;
|
|
}
|
|
lseek(env->me_fd, dp->p.mp_pgno * env->me_psize, SEEK_SET);
|
|
next = dp->p.mp_pgno;
|
|
}
|
|
DPRINTF("committing page %lu", dp->p.mp_pgno);
|
|
iov[n].iov_len = env->me_psize * dp->h.md_num;
|
|
iov[n].iov_base = &dp->p;
|
|
size += iov[n].iov_len;
|
|
next = dp->p.mp_pgno + dp->h.md_num;
|
|
/* clear dirty flag */
|
|
dp->p.mp_flags &= ~P_DIRTY;
|
|
if (++n >= MDB_COMMIT_PAGES) {
|
|
done = 0;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (n == 0)
|
|
break;
|
|
|
|
DPRINTF("committing %u dirty pages", n);
|
|
rc = writev(env->me_fd, iov, n);
|
|
if (rc != size) {
|
|
n = errno;
|
|
if (rc > 0)
|
|
DPUTS("short write, filesystem full?");
|
|
else
|
|
DPRINTF("writev: %s", strerror(errno));
|
|
mdb_txn_abort(txn);
|
|
return n;
|
|
}
|
|
|
|
} 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 (dp->h.md_num == 1) {
|
|
dp->h.md_parent = (MDB_page *)txn->mt_env->me_dpages;
|
|
txn->mt_env->me_dpages = dp;
|
|
} else {
|
|
free(dp);
|
|
}
|
|
txn->mt_u.dirty_list[i].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;
|
|
|
|
for (i = 2; i < env->me_numdbs; i++) {
|
|
if (txn->mt_dbxs[i].md_dirty) {
|
|
env->me_dbs[toggle][i] = txn->mt_dbs[i];
|
|
txn->mt_dbxs[i].md_dirty = 0;
|
|
}
|
|
}
|
|
for (i = env->me_numdbs; i < txn->mt_numdbs; i++) {
|
|
txn->mt_dbxs[i].md_dirty = 0;
|
|
env->me_dbxs[i] = txn->mt_dbxs[i];
|
|
env->me_dbs[toggle][i] = txn->mt_dbs[i];
|
|
}
|
|
env->me_db_toggle = toggle;
|
|
env->me_numdbs = txn->mt_numdbs;
|
|
|
|
free(txn->mt_dbs);
|
|
}
|
|
|
|
pthread_mutex_unlock(&env->me_txns->mti_wmutex);
|
|
free(txn);
|
|
|
|
return MDB_SUCCESS;
|
|
}
|
|
|
|
static int
|
|
mdb_env_read_header(MDB_env *env, MDB_meta *meta)
|
|
{
|
|
char page[PAGESIZE];
|
|
MDB_page *p;
|
|
MDB_meta *m;
|
|
int rc;
|
|
|
|
assert(env != NULL);
|
|
|
|
/* We don't know the page size yet, so use a minimum value.
|
|
*/
|
|
|
|
if ((rc = pread(env->me_fd, page, PAGESIZE, 0)) == 0) {
|
|
return ENOENT;
|
|
} else if (rc != PAGESIZE) {
|
|
if (rc > 0)
|
|
errno = EINVAL;
|
|
DPRINTF("read: %s", strerror(errno));
|
|
return errno;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
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");
|
|
psize = sysconf(_SC_PAGE_SIZE);
|
|
|
|
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));
|
|
|
|
rc = write(env->me_fd, p, psize * 2);
|
|
free(p);
|
|
return (rc == (int)psize * 2) ? MDB_SUCCESS : errno;
|
|
}
|
|
|
|
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;
|
|
|
|
assert(txn != NULL);
|
|
assert(txn->mt_env != NULL);
|
|
|
|
toggle = !F_ISSET(txn->mt_flags, MDB_TXN_METOGGLE);
|
|
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 */
|
|
rc = pwrite(env->me_mfd, ptr, len, off);
|
|
if (rc != len) {
|
|
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;
|
|
rc = pwrite(env->me_fd, ptr, len, off);
|
|
env->me_flags |= MDB_FATAL_ERROR;
|
|
return errno;
|
|
}
|
|
txn->mt_env->me_txns->mti_me_toggle = toggle;
|
|
|
|
return MDB_SUCCESS;
|
|
}
|
|
|
|
static int
|
|
mdb_env_read_meta(MDB_env *env, int *which)
|
|
{
|
|
int toggle = 0;
|
|
|
|
assert(env != NULL);
|
|
|
|
if (which)
|
|
toggle = *which;
|
|
else if (env->me_metas[0]->mm_txnid < env->me_metas[1]->mm_txnid)
|
|
toggle = 1;
|
|
|
|
if (env->me_meta != env->me_metas[toggle])
|
|
env->me_meta = env->me_metas[toggle];
|
|
|
|
DPRINTF("Using meta page %d", 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 = -1;
|
|
e->me_lfd = -1;
|
|
e->me_mfd = -1;
|
|
*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)
|
|
{
|
|
env->me_maxdbs = dbs;
|
|
return MDB_SUCCESS;
|
|
}
|
|
|
|
int
|
|
mdb_env_set_maxreaders(MDB_env *env, int readers)
|
|
{
|
|
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;
|
|
}
|
|
|
|
static int
|
|
mdb_env_open2(MDB_env *env, unsigned int flags)
|
|
{
|
|
int i, newenv = 0;
|
|
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;
|
|
}
|
|
|
|
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 errno;
|
|
|
|
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, NULL)) != 0)
|
|
return i;
|
|
|
|
DPRINTF("opened database version %u, pagesize %u",
|
|
env->me_meta->mm_version, env->me_psize);
|
|
DPRINTF("depth: %u", env->me_meta->mm_dbs[MAIN_DBI].md_depth);
|
|
DPRINTF("entries: %lu", env->me_meta->mm_dbs[MAIN_DBI].md_entries);
|
|
DPRINTF("branch pages: %lu", env->me_meta->mm_dbs[MAIN_DBI].md_branch_pages);
|
|
DPRINTF("leaf pages: %lu", env->me_meta->mm_dbs[MAIN_DBI].md_leaf_pages);
|
|
DPRINTF("overflow pages: %lu", env->me_meta->mm_dbs[MAIN_DBI].md_overflow_pages);
|
|
DPRINTF("root: %lu", env->me_meta->mm_dbs[MAIN_DBI].md_root);
|
|
|
|
return MDB_SUCCESS;
|
|
}
|
|
|
|
static void
|
|
mdb_env_reader_dest(void *ptr)
|
|
{
|
|
MDB_reader *reader = ptr;
|
|
|
|
reader->mr_txnid = 0;
|
|
reader->mr_pid = 0;
|
|
reader->mr_tid = 0;
|
|
}
|
|
|
|
/* downgrade the exclusive lock on the region back to shared */
|
|
static void
|
|
mdb_env_share_locks(MDB_env *env)
|
|
{
|
|
struct flock lock_info;
|
|
|
|
env->me_txns->mti_txnid = env->me_meta->mm_txnid;
|
|
if (env->me_metas[0]->mm_txnid < env->me_metas[1]->mm_txnid)
|
|
env->me_txns->mti_me_toggle = 1;
|
|
|
|
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);
|
|
}
|
|
|
|
static int
|
|
mdb_env_setup_locks(MDB_env *env, char *lpath, int mode, int *excl)
|
|
{
|
|
int rc;
|
|
off_t size, rsize;
|
|
struct flock lock_info;
|
|
|
|
*excl = 0;
|
|
|
|
if ((env->me_lfd = open(lpath, O_RDWR|O_CREAT, mode)) == -1) {
|
|
rc = errno;
|
|
return rc;
|
|
}
|
|
/* Try to get exclusive lock. If we succeed, then
|
|
* nobody is using the lock region and we should initialize it.
|
|
*/
|
|
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_SETLK, &lock_info);
|
|
if (rc) {
|
|
rc = errno;
|
|
goto fail;
|
|
}
|
|
}
|
|
size = lseek(env->me_lfd, 0, SEEK_END);
|
|
rsize = (env->me_maxreaders-1) * sizeof(MDB_reader) + sizeof(MDB_txninfo);
|
|
if (size < rsize && *excl) {
|
|
if (ftruncate(env->me_lfd, rsize) != 0) {
|
|
rc = errno;
|
|
goto fail;
|
|
}
|
|
} else {
|
|
rsize = size;
|
|
size = rsize - sizeof(MDB_txninfo);
|
|
env->me_maxreaders = size/sizeof(MDB_reader) + 1;
|
|
}
|
|
env->me_txns = mmap(0, rsize, PROT_READ|PROT_WRITE, MAP_SHARED,
|
|
env->me_lfd, 0);
|
|
if (env->me_txns == MAP_FAILED) {
|
|
rc = errno;
|
|
goto fail;
|
|
}
|
|
if (*excl) {
|
|
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);
|
|
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;
|
|
}
|
|
if (errno != EACCES && errno != EAGAIN) {
|
|
rc = errno;
|
|
goto fail;
|
|
}
|
|
}
|
|
return MDB_SUCCESS;
|
|
|
|
fail:
|
|
close(env->me_lfd);
|
|
env->me_lfd = -1;
|
|
return rc;
|
|
|
|
}
|
|
|
|
#define LOCKNAME "/lock.mdb"
|
|
#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;
|
|
|
|
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 = errno;
|
|
goto leave;
|
|
}
|
|
|
|
if ((rc = mdb_env_open2(env, flags)) == MDB_SUCCESS) {
|
|
/* synchronous fd for meta writes */
|
|
if (!(flags & (MDB_RDONLY|MDB_NOSYNC)))
|
|
oflags |= MDB_DSYNC;
|
|
if ((env->me_mfd = open(dpath, oflags, mode)) == -1) {
|
|
rc = errno;
|
|
goto leave;
|
|
}
|
|
|
|
env->me_path = strdup(path);
|
|
DPRINTF("opened dbenv %p", (void *) env);
|
|
pthread_key_create(&env->me_txkey, mdb_env_reader_dest);
|
|
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 >= 0) {
|
|
close(env->me_fd);
|
|
env->me_fd = -1;
|
|
}
|
|
if (env->me_lfd >= 0) {
|
|
close(env->me_lfd);
|
|
env->me_lfd = -1;
|
|
}
|
|
}
|
|
free(lpath);
|
|
return rc;
|
|
}
|
|
|
|
void
|
|
mdb_env_close(MDB_env *env)
|
|
{
|
|
MDB_dpage *dp;
|
|
|
|
if (env == NULL)
|
|
return;
|
|
|
|
while (env->me_dpages) {
|
|
dp = env->me_dpages;
|
|
env->me_dpages = (MDB_dpage *)dp->h.md_parent;
|
|
free(dp);
|
|
}
|
|
|
|
free(env->me_dbs[1]);
|
|
free(env->me_dbs[0]);
|
|
free(env->me_dbxs);
|
|
free(env->me_path);
|
|
|
|
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();
|
|
size_t size = (env->me_maxreaders-1) * sizeof(MDB_reader) + sizeof(MDB_txninfo);
|
|
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, size);
|
|
}
|
|
close(env->me_lfd);
|
|
free(env);
|
|
}
|
|
|
|
/* 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_txn *txn, MDB_dbi dbi, MDB_page *mp, MDB_val *key,
|
|
int *exactp, unsigned int *kip)
|
|
{
|
|
unsigned int i = 0;
|
|
int low, high;
|
|
int rc = 0;
|
|
MDB_node *node;
|
|
MDB_val nodekey;
|
|
|
|
DPRINTF("searching %u keys in %s page %lu",
|
|
NUMKEYS(mp),
|
|
IS_LEAF(mp) ? "leaf" : "branch",
|
|
mp->mp_pgno);
|
|
|
|
assert(NUMKEYS(mp) > 0);
|
|
|
|
memset(&nodekey, 0, sizeof(nodekey));
|
|
|
|
low = IS_LEAF(mp) ? 0 : 1;
|
|
high = NUMKEYS(mp) - 1;
|
|
while (low <= high) {
|
|
i = (low + high) >> 1;
|
|
node = NODEPTR(mp, i);
|
|
|
|
nodekey.mv_size = node->mn_ksize;
|
|
nodekey.mv_data = NODEKEY(node);
|
|
|
|
rc = mdb_cmp(txn, dbi, key, &nodekey);
|
|
|
|
if (IS_LEAF(mp))
|
|
DPRINTF("found leaf index %u [%.*s], rc = %i",
|
|
i, (int)nodekey.mv_size, (char *)nodekey.mv_data, rc);
|
|
else
|
|
DPRINTF("found branch index %u [%.*s -> %lu], rc = %i",
|
|
i, (int)node->mn_ksize, (char *)NODEKEY(node),
|
|
node->mn_pgno, rc);
|
|
|
|
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 (i >= NUMKEYS(mp))
|
|
/* There is no entry larger or equal to the key. */
|
|
return NULL;
|
|
}
|
|
if (exactp)
|
|
*exactp = (rc == 0);
|
|
if (kip) /* Store the key index if requested. */
|
|
*kip = i;
|
|
|
|
return NODEPTR(mp, i);
|
|
}
|
|
|
|
static void
|
|
cursor_pop_page(MDB_cursor *cursor)
|
|
{
|
|
MDB_ppage *top;
|
|
|
|
if (cursor->mc_snum) {
|
|
top = CURSOR_TOP(cursor);
|
|
cursor->mc_snum--;
|
|
|
|
DPRINTF("popped page %lu off cursor %p", top->mp_page->mp_pgno, (void *) cursor);
|
|
}
|
|
}
|
|
|
|
static MDB_ppage *
|
|
cursor_push_page(MDB_cursor *cursor, MDB_page *mp)
|
|
{
|
|
MDB_ppage *ppage;
|
|
|
|
DPRINTF("pushing page %lu on cursor %p", mp->mp_pgno, (void *) cursor);
|
|
|
|
ppage = &cursor->mc_stack[cursor->mc_snum++];
|
|
ppage->mp_page = mp;
|
|
ppage->mp_ki = 0;
|
|
return ppage;
|
|
}
|
|
|
|
static MDB_page *
|
|
mdb_get_page(MDB_txn *txn, pgno_t pgno)
|
|
{
|
|
MDB_page *p = NULL;
|
|
int found = 0;
|
|
|
|
if (!F_ISSET(txn->mt_flags, MDB_TXN_RDONLY) && txn->mt_u.dirty_list[0].mid) {
|
|
MDB_dpage *dp;
|
|
MIDL2 id;
|
|
unsigned x;
|
|
id.mid = pgno;
|
|
x = mdb_midl2_search(txn->mt_u.dirty_list, &id);
|
|
if (x <= txn->mt_u.dirty_list[0].mid && txn->mt_u.dirty_list[x].mid == pgno) {
|
|
dp = txn->mt_u.dirty_list[x].mptr;
|
|
p = &dp->p;
|
|
found = 1;
|
|
}
|
|
}
|
|
if (!found) {
|
|
if (pgno > txn->mt_env->me_meta->mm_last_pg)
|
|
return NULL;
|
|
p = (MDB_page *)(txn->mt_env->me_map + txn->mt_env->me_psize * pgno);
|
|
}
|
|
return p;
|
|
}
|
|
|
|
static int
|
|
mdb_search_page_root(MDB_txn *txn, MDB_dbi dbi, MDB_val *key,
|
|
MDB_cursor *cursor, int modify, MDB_pageparent *mpp)
|
|
{
|
|
MDB_page *mp = mpp->mp_page;
|
|
int rc;
|
|
|
|
if (cursor && cursor_push_page(cursor, mp) == NULL)
|
|
return ENOMEM;
|
|
|
|
while (IS_BRANCH(mp)) {
|
|
unsigned int i = 0;
|
|
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. */
|
|
i = 0;
|
|
else if (key->mv_size > MAXKEYSIZE && key->mv_data == NULL) {
|
|
/* cursor to last page */
|
|
i = NUMKEYS(mp)-1;
|
|
} else {
|
|
int exact;
|
|
node = mdb_search_node(txn, dbi, mp, key, &exact, &i);
|
|
if (node == NULL)
|
|
i = NUMKEYS(mp) - 1;
|
|
else if (!exact) {
|
|
assert(i > 0);
|
|
i--;
|
|
}
|
|
}
|
|
|
|
if (key)
|
|
DPRINTF("following index %u for key %.*s",
|
|
i, (int)key->mv_size, (char *)key->mv_data);
|
|
assert(i < NUMKEYS(mp));
|
|
node = NODEPTR(mp, i);
|
|
|
|
if (cursor)
|
|
CURSOR_TOP(cursor)->mp_ki = i;
|
|
|
|
mpp->mp_parent = mp;
|
|
if ((mp = mdb_get_page(txn, NODEPGNO(node))) == NULL)
|
|
return MDB_PAGE_NOTFOUND;
|
|
mpp->mp_pi = i;
|
|
mpp->mp_page = mp;
|
|
|
|
if (cursor && cursor_push_page(cursor, mp) == NULL)
|
|
return ENOMEM;
|
|
|
|
if (modify) {
|
|
MDB_dhead *dh = ((MDB_dhead *)mp)-1;
|
|
if ((rc = mdb_touch(txn, mpp)) != 0)
|
|
return rc;
|
|
dh = ((MDB_dhead *)mpp->mp_page)-1;
|
|
dh->md_parent = mpp->mp_parent;
|
|
dh->md_pi = mpp->mp_pi;
|
|
}
|
|
|
|
mp = mpp->mp_page;
|
|
}
|
|
|
|
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 ? (int)key->mv_size : 0, key ? (char *)key->mv_data : NULL);
|
|
|
|
return MDB_SUCCESS;
|
|
}
|
|
|
|
/* Search for the page a given key should be in.
|
|
* Stores a pointer to the found page in *mpp.
|
|
* If key is NULL, search for the lowest page (used by mdb_cursor_first).
|
|
* If cursor is non-null, pushes parent pages on the cursor stack.
|
|
* If modify is true, visited pages are updated with new page numbers.
|
|
*/
|
|
static int
|
|
mdb_search_page(MDB_txn *txn, MDB_dbi dbi, MDB_val *key,
|
|
MDB_cursor *cursor, int modify, MDB_pageparent *mpp)
|
|
{
|
|
int rc;
|
|
pgno_t root;
|
|
|
|
/* Choose which root page to start with. If a transaction is given
|
|
* use the root page from the transaction, otherwise read the last
|
|
* committed root page.
|
|
*/
|
|
if (F_ISSET(txn->mt_flags, MDB_TXN_ERROR)) {
|
|
DPUTS("transaction has failed, must abort");
|
|
return EINVAL;
|
|
} else
|
|
root = txn->mt_dbs[dbi].md_root;
|
|
|
|
if (root == P_INVALID) { /* Tree is empty. */
|
|
DPUTS("tree is empty");
|
|
return MDB_NOTFOUND;
|
|
}
|
|
|
|
if ((mpp->mp_page = mdb_get_page(txn, root)) == NULL)
|
|
return MDB_PAGE_NOTFOUND;
|
|
|
|
DPRINTF("root page has flags 0x%X", mpp->mp_page->mp_flags);
|
|
|
|
if (modify) {
|
|
/* For sub-databases, update main root first */
|
|
if (dbi > MAIN_DBI && !txn->mt_dbxs[dbi].md_dirty) {
|
|
MDB_pageparent mp2;
|
|
rc = mdb_search_page(txn, MAIN_DBI, &txn->mt_dbxs[dbi].md_name,
|
|
NULL, 1, &mp2);
|
|
if (rc)
|
|
return rc;
|
|
txn->mt_dbxs[dbi].md_dirty = 1;
|
|
}
|
|
if (!F_ISSET(mpp->mp_page->mp_flags, P_DIRTY)) {
|
|
mpp->mp_parent = NULL;
|
|
mpp->mp_pi = 0;
|
|
if ((rc = mdb_touch(txn, mpp)))
|
|
return rc;
|
|
txn->mt_dbs[dbi].md_root = mpp->mp_page->mp_pgno;
|
|
}
|
|
}
|
|
|
|
return mdb_search_page_root(txn, dbi, key, cursor, modify, mpp);
|
|
}
|
|
|
|
static int
|
|
mdb_read_data(MDB_txn *txn, MDB_node *leaf, MDB_val *data)
|
|
{
|
|
MDB_page *omp; /* overflow mpage */
|
|
pgno_t pgno;
|
|
|
|
if (!F_ISSET(leaf->mn_flags, F_BIGDATA)) {
|
|
data->mv_size = leaf->mn_dsize;
|
|
data->mv_data = NODEDATA(leaf);
|
|
return MDB_SUCCESS;
|
|
}
|
|
|
|
/* Read overflow data.
|
|
*/
|
|
data->mv_size = leaf->mn_dsize;
|
|
memcpy(&pgno, NODEDATA(leaf), sizeof(pgno));
|
|
if ((omp = mdb_get_page(txn, pgno)) == NULL) {
|
|
DPRINTF("read overflow page %lu failed", pgno);
|
|
return MDB_PAGE_NOTFOUND;
|
|
}
|
|
data->mv_data = METADATA(omp);
|
|
|
|
return MDB_SUCCESS;
|
|
}
|
|
|
|
int
|
|
mdb_get(MDB_txn *txn, MDB_dbi dbi,
|
|
MDB_val *key, MDB_val *data)
|
|
{
|
|
int rc, exact;
|
|
MDB_node *leaf;
|
|
MDB_pageparent mpp;
|
|
|
|
assert(key);
|
|
assert(data);
|
|
DPRINTF("===> get key [%.*s]", (int)key->mv_size, (char *)key->mv_data);
|
|
|
|
if (txn == NULL || !dbi || dbi >= txn->mt_numdbs)
|
|
return EINVAL;
|
|
|
|
if (key->mv_size == 0 || key->mv_size > MAXKEYSIZE) {
|
|
return EINVAL;
|
|
}
|
|
|
|
if ((rc = mdb_search_page(txn, dbi, key, NULL, 0, &mpp)) != MDB_SUCCESS)
|
|
return rc;
|
|
|
|
leaf = mdb_search_node(txn, dbi, mpp.mp_page, key, &exact, NULL);
|
|
if (leaf && exact) {
|
|
/* Return first duplicate data item */
|
|
if (F_ISSET(leaf->mn_flags, F_DUPDATA)) {
|
|
MDB_xcursor mx;
|
|
|
|
mdb_xcursor_init0(txn, dbi, &mx);
|
|
mdb_xcursor_init1(txn, dbi, &mx, leaf);
|
|
rc = mdb_search_page(&mx.mx_txn, mx.mx_cursor.mc_dbi, NULL, NULL, 0, &mpp);
|
|
if (rc != MDB_SUCCESS)
|
|
return rc;
|
|
leaf = NODEPTR(mpp.mp_page, 0);
|
|
}
|
|
rc = mdb_read_data(txn, leaf, data);
|
|
} else {
|
|
rc = MDB_NOTFOUND;
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
static int
|
|
mdb_sibling(MDB_cursor *cursor, int move_right)
|
|
{
|
|
int rc;
|
|
MDB_node *indx;
|
|
MDB_ppage *parent;
|
|
MDB_page *mp;
|
|
|
|
if (cursor->mc_snum < 2) {
|
|
return MDB_NOTFOUND; /* root has no siblings */
|
|
}
|
|
parent = CURSOR_PARENT(cursor);
|
|
|
|
DPRINTF("parent page is page %lu, index %u",
|
|
parent->mp_page->mp_pgno, parent->mp_ki);
|
|
|
|
cursor_pop_page(cursor);
|
|
if (move_right ? (parent->mp_ki + 1 >= NUMKEYS(parent->mp_page))
|
|
: (parent->mp_ki == 0)) {
|
|
DPRINTF("no more keys left, moving to %s sibling",
|
|
move_right ? "right" : "left");
|
|
if ((rc = mdb_sibling(cursor, move_right)) != MDB_SUCCESS)
|
|
return rc;
|
|
parent = CURSOR_TOP(cursor);
|
|
} else {
|
|
if (move_right)
|
|
parent->mp_ki++;
|
|
else
|
|
parent->mp_ki--;
|
|
DPRINTF("just moving to %s index key %u",
|
|
move_right ? "right" : "left", parent->mp_ki);
|
|
}
|
|
assert(IS_BRANCH(parent->mp_page));
|
|
|
|
indx = NODEPTR(parent->mp_page, parent->mp_ki);
|
|
if ((mp = mdb_get_page(cursor->mc_txn, indx->mn_pgno)) == NULL)
|
|
return MDB_PAGE_NOTFOUND;
|
|
#if 0
|
|
mp->parent = parent->mp_page;
|
|
mp->parent_index = parent->mp_ki;
|
|
#endif
|
|
|
|
cursor_push_page(cursor, mp);
|
|
|
|
return MDB_SUCCESS;
|
|
}
|
|
|
|
static int
|
|
mdb_set_key(MDB_node *node, MDB_val *key)
|
|
{
|
|
if (key == NULL)
|
|
return 0;
|
|
|
|
key->mv_size = node->mn_ksize;
|
|
key->mv_data = NODEKEY(node);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
mdb_cursor_next(MDB_cursor *cursor, MDB_val *key, MDB_val *data, MDB_cursor_op op)
|
|
{
|
|
MDB_ppage *top;
|
|
MDB_page *mp;
|
|
MDB_node *leaf;
|
|
int rc;
|
|
|
|
if (cursor->mc_eof) {
|
|
return MDB_NOTFOUND;
|
|
}
|
|
|
|
assert(cursor->mc_initialized);
|
|
|
|
top = CURSOR_TOP(cursor);
|
|
mp = top->mp_page;
|
|
|
|
if (cursor->mc_txn->mt_dbs[cursor->mc_dbi].md_flags & MDB_DUPSORT) {
|
|
leaf = NODEPTR(mp, top->mp_ki);
|
|
if ((op == MDB_NEXT || op == MDB_NEXT_DUP) && F_ISSET(leaf->mn_flags, F_DUPDATA)) {
|
|
rc = mdb_cursor_next(&cursor->mc_xcursor->mx_cursor, data, NULL, MDB_NEXT);
|
|
if (op != MDB_NEXT || rc == MDB_SUCCESS)
|
|
return rc;
|
|
}
|
|
}
|
|
|
|
DPRINTF("cursor_next: top page is %lu in cursor %p", mp->mp_pgno, (void *) cursor);
|
|
|
|
if (top->mp_ki + 1 >= NUMKEYS(mp)) {
|
|
DPUTS("=====> move to next sibling page");
|
|
if (mdb_sibling(cursor, 1) != MDB_SUCCESS) {
|
|
cursor->mc_eof = 1;
|
|
return MDB_NOTFOUND;
|
|
}
|
|
top = CURSOR_TOP(cursor);
|
|
mp = top->mp_page;
|
|
DPRINTF("next page is %lu, key index %u", mp->mp_pgno, top->mp_ki);
|
|
} else
|
|
top->mp_ki++;
|
|
|
|
DPRINTF("==> cursor points to page %lu with %u keys, key index %u",
|
|
mp->mp_pgno, NUMKEYS(mp), top->mp_ki);
|
|
|
|
assert(IS_LEAF(mp));
|
|
leaf = NODEPTR(mp, top->mp_ki);
|
|
|
|
if (F_ISSET(leaf->mn_flags, F_DUPDATA)) {
|
|
mdb_xcursor_init1(cursor->mc_txn, cursor->mc_dbi, cursor->mc_xcursor, leaf);
|
|
}
|
|
if (data) {
|
|
if ((rc = mdb_read_data(cursor->mc_txn, leaf, data) != MDB_SUCCESS))
|
|
return rc;
|
|
|
|
if (F_ISSET(leaf->mn_flags, F_DUPDATA)) {
|
|
rc = mdb_cursor_first(&cursor->mc_xcursor->mx_cursor, data, NULL);
|
|
if (rc != MDB_SUCCESS)
|
|
return rc;
|
|
}
|
|
}
|
|
|
|
return mdb_set_key(leaf, key);
|
|
}
|
|
|
|
static int
|
|
mdb_cursor_prev(MDB_cursor *cursor, MDB_val *key, MDB_val *data, MDB_cursor_op op)
|
|
{
|
|
MDB_ppage *top;
|
|
MDB_page *mp;
|
|
MDB_node *leaf;
|
|
int rc;
|
|
|
|
assert(cursor->mc_initialized);
|
|
|
|
top = CURSOR_TOP(cursor);
|
|
mp = top->mp_page;
|
|
|
|
if (cursor->mc_txn->mt_dbs[cursor->mc_dbi].md_flags & MDB_DUPSORT) {
|
|
leaf = NODEPTR(mp, top->mp_ki);
|
|
if ((op == MDB_PREV || op == MDB_PREV_DUP) && F_ISSET(leaf->mn_flags, F_DUPDATA)) {
|
|
rc = mdb_cursor_prev(&cursor->mc_xcursor->mx_cursor, data, NULL, MDB_PREV);
|
|
if (op != MDB_PREV || rc == MDB_SUCCESS)
|
|
return rc;
|
|
}
|
|
}
|
|
|
|
DPRINTF("cursor_prev: top page is %lu in cursor %p", mp->mp_pgno, (void *) cursor);
|
|
|
|
if (top->mp_ki == 0) {
|
|
DPUTS("=====> move to prev sibling page");
|
|
if (mdb_sibling(cursor, 0) != MDB_SUCCESS) {
|
|
return MDB_NOTFOUND;
|
|
}
|
|
top = CURSOR_TOP(cursor);
|
|
mp = top->mp_page;
|
|
top->mp_ki = NUMKEYS(mp) - 1;
|
|
DPRINTF("prev page is %lu, key index %u", mp->mp_pgno, top->mp_ki);
|
|
} else
|
|
top->mp_ki--;
|
|
|
|
cursor->mc_eof = 0;
|
|
|
|
DPRINTF("==> cursor points to page %lu with %u keys, key index %u",
|
|
mp->mp_pgno, NUMKEYS(mp), top->mp_ki);
|
|
|
|
assert(IS_LEAF(mp));
|
|
leaf = NODEPTR(mp, top->mp_ki);
|
|
|
|
if (F_ISSET(leaf->mn_flags, F_DUPDATA)) {
|
|
mdb_xcursor_init1(cursor->mc_txn, cursor->mc_dbi, cursor->mc_xcursor, leaf);
|
|
}
|
|
if (data) {
|
|
if ((rc = mdb_read_data(cursor->mc_txn, leaf, data) != MDB_SUCCESS))
|
|
return rc;
|
|
|
|
if (F_ISSET(leaf->mn_flags, F_DUPDATA)) {
|
|
rc = mdb_cursor_last(&cursor->mc_xcursor->mx_cursor, data, NULL);
|
|
if (rc != MDB_SUCCESS)
|
|
return rc;
|
|
}
|
|
}
|
|
|
|
return mdb_set_key(leaf, key);
|
|
}
|
|
|
|
static int
|
|
mdb_cursor_set(MDB_cursor *cursor, MDB_val *key, MDB_val *data,
|
|
MDB_cursor_op op, int *exactp)
|
|
{
|
|
int rc;
|
|
MDB_node *leaf;
|
|
MDB_ppage *top;
|
|
MDB_pageparent mpp;
|
|
|
|
assert(cursor);
|
|
assert(key);
|
|
assert(key->mv_size > 0);
|
|
|
|
cursor->mc_snum = 0;
|
|
|
|
rc = mdb_search_page(cursor->mc_txn, cursor->mc_dbi, key, cursor, 0, &mpp);
|
|
if (rc != MDB_SUCCESS)
|
|
return rc;
|
|
assert(IS_LEAF(mpp.mp_page));
|
|
|
|
top = CURSOR_TOP(cursor);
|
|
leaf = mdb_search_node(cursor->mc_txn, cursor->mc_dbi, mpp.mp_page, key, exactp, &top->mp_ki);
|
|
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(cursor, 1)) != MDB_SUCCESS)
|
|
return rc; /* no entries matched */
|
|
top = CURSOR_TOP(cursor);
|
|
top->mp_ki = 0;
|
|
mpp.mp_page = top->mp_page;
|
|
assert(IS_LEAF(mpp.mp_page));
|
|
leaf = NODEPTR(mpp.mp_page, 0);
|
|
}
|
|
|
|
cursor->mc_initialized = 1;
|
|
cursor->mc_eof = 0;
|
|
|
|
if (F_ISSET(leaf->mn_flags, F_DUPDATA)) {
|
|
mdb_xcursor_init1(cursor->mc_txn, cursor->mc_dbi, cursor->mc_xcursor, leaf);
|
|
}
|
|
if (data) {
|
|
if (F_ISSET(leaf->mn_flags, F_DUPDATA)) {
|
|
if (op == MDB_SET || op == MDB_SET_RANGE) {
|
|
rc = mdb_cursor_first(&cursor->mc_xcursor->mx_cursor, data, NULL);
|
|
} else {
|
|
int ex2, *ex2p;
|
|
MDB_cursor_op op2;
|
|
if (op == MDB_GET_BOTH) {
|
|
ex2p = &ex2;
|
|
op2 = MDB_SET;
|
|
} else {
|
|
ex2p = NULL;
|
|
op2 = MDB_SET_RANGE;
|
|
}
|
|
rc = mdb_cursor_set(&cursor->mc_xcursor->mx_cursor, data, NULL, op2, 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(cursor->mc_txn, leaf, &d2)) != MDB_SUCCESS)
|
|
return rc;
|
|
rc = mdb_dcmp(cursor->mc_txn, cursor->mc_dbi, data, &d2);
|
|
if (rc) {
|
|
if (op == MDB_GET_BOTH || rc > 0)
|
|
return MDB_NOTFOUND;
|
|
}
|
|
|
|
} else {
|
|
if ((rc = mdb_read_data(cursor->mc_txn, leaf, data)) != MDB_SUCCESS)
|
|
return rc;
|
|
}
|
|
}
|
|
|
|
rc = mdb_set_key(leaf, key);
|
|
if (rc == MDB_SUCCESS) {
|
|
DPRINTF("==> cursor placed on key %.*s",
|
|
(int)key->mv_size, (char *)key->mv_data);
|
|
;
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
static int
|
|
mdb_cursor_first(MDB_cursor *cursor, MDB_val *key, MDB_val *data)
|
|
{
|
|
int rc;
|
|
MDB_pageparent mpp;
|
|
MDB_node *leaf;
|
|
|
|
cursor->mc_snum = 0;
|
|
|
|
rc = mdb_search_page(cursor->mc_txn, cursor->mc_dbi, NULL, cursor, 0, &mpp);
|
|
if (rc != MDB_SUCCESS)
|
|
return rc;
|
|
assert(IS_LEAF(mpp.mp_page));
|
|
|
|
leaf = NODEPTR(mpp.mp_page, 0);
|
|
cursor->mc_initialized = 1;
|
|
cursor->mc_eof = 0;
|
|
|
|
if (data) {
|
|
if (F_ISSET(leaf->mn_flags, F_DUPDATA)) {
|
|
mdb_xcursor_init1(cursor->mc_txn, cursor->mc_dbi, cursor->mc_xcursor, leaf);
|
|
rc = mdb_cursor_first(&cursor->mc_xcursor->mx_cursor, data, NULL);
|
|
if (rc)
|
|
return rc;
|
|
} else {
|
|
if ((rc = mdb_read_data(cursor->mc_txn, leaf, data)) != MDB_SUCCESS)
|
|
return rc;
|
|
}
|
|
}
|
|
return mdb_set_key(leaf, key);
|
|
}
|
|
|
|
static int
|
|
mdb_cursor_last(MDB_cursor *cursor, MDB_val *key, MDB_val *data)
|
|
{
|
|
int rc;
|
|
MDB_ppage *top;
|
|
MDB_pageparent mpp;
|
|
MDB_node *leaf;
|
|
MDB_val lkey;
|
|
|
|
cursor->mc_snum = 0;
|
|
|
|
lkey.mv_size = MAXKEYSIZE+1;
|
|
lkey.mv_data = NULL;
|
|
|
|
rc = mdb_search_page(cursor->mc_txn, cursor->mc_dbi, &lkey, cursor, 0, &mpp);
|
|
if (rc != MDB_SUCCESS)
|
|
return rc;
|
|
assert(IS_LEAF(mpp.mp_page));
|
|
|
|
leaf = NODEPTR(mpp.mp_page, NUMKEYS(mpp.mp_page)-1);
|
|
cursor->mc_initialized = 1;
|
|
cursor->mc_eof = 0;
|
|
|
|
top = CURSOR_TOP(cursor);
|
|
top->mp_ki = NUMKEYS(top->mp_page) - 1;
|
|
|
|
if (data) {
|
|
if (F_ISSET(leaf->mn_flags, F_DUPDATA)) {
|
|
mdb_xcursor_init1(cursor->mc_txn, cursor->mc_dbi, cursor->mc_xcursor, leaf);
|
|
rc = mdb_cursor_last(&cursor->mc_xcursor->mx_cursor, data, NULL);
|
|
if (rc)
|
|
return rc;
|
|
} else {
|
|
if ((rc = mdb_read_data(cursor->mc_txn, leaf, data)) != MDB_SUCCESS)
|
|
return rc;
|
|
}
|
|
}
|
|
|
|
return mdb_set_key(leaf, key);
|
|
}
|
|
|
|
int
|
|
mdb_cursor_get(MDB_cursor *cursor, MDB_val *key, MDB_val *data,
|
|
MDB_cursor_op op)
|
|
{
|
|
int rc;
|
|
int exact = 0;
|
|
|
|
assert(cursor);
|
|
|
|
switch (op) {
|
|
case MDB_GET_BOTH:
|
|
case MDB_GET_BOTH_RANGE:
|
|
if (data == NULL || cursor->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(cursor, key, data, op, NULL);
|
|
else
|
|
rc = mdb_cursor_set(cursor, key, data, op, &exact);
|
|
break;
|
|
case MDB_NEXT:
|
|
case MDB_NEXT_DUP:
|
|
case MDB_NEXT_NODUP:
|
|
if (!cursor->mc_initialized)
|
|
rc = mdb_cursor_first(cursor, key, data);
|
|
else
|
|
rc = mdb_cursor_next(cursor, key, data, op);
|
|
break;
|
|
case MDB_PREV:
|
|
case MDB_PREV_DUP:
|
|
case MDB_PREV_NODUP:
|
|
if (!cursor->mc_initialized || cursor->mc_eof)
|
|
rc = mdb_cursor_last(cursor, key, data);
|
|
else
|
|
rc = mdb_cursor_prev(cursor, key, data, op);
|
|
break;
|
|
case MDB_FIRST:
|
|
rc = mdb_cursor_first(cursor, key, data);
|
|
break;
|
|
case MDB_LAST:
|
|
rc = mdb_cursor_last(cursor, key, data);
|
|
break;
|
|
default:
|
|
DPRINTF("unhandled/unimplemented cursor operation %u", op);
|
|
rc = EINVAL;
|
|
break;
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
/* Allocate a page and initialize it
|
|
*/
|
|
static MDB_dpage *
|
|
mdb_new_page(MDB_txn *txn, MDB_dbi dbi, uint32_t flags, int num)
|
|
{
|
|
MDB_dpage *dp;
|
|
|
|
if ((dp = mdb_alloc_page(txn, NULL, 0, num)) == NULL)
|
|
return NULL;
|
|
DPRINTF("allocated new mpage %lu, page size %u",
|
|
dp->p.mp_pgno, txn->mt_env->me_psize);
|
|
dp->p.mp_flags = flags | P_DIRTY;
|
|
dp->p.mp_lower = PAGEHDRSZ;
|
|
dp->p.mp_upper = txn->mt_env->me_psize;
|
|
|
|
if (IS_BRANCH(&dp->p))
|
|
txn->mt_dbs[dbi].md_branch_pages++;
|
|
else if (IS_LEAF(&dp->p))
|
|
txn->mt_dbs[dbi].md_leaf_pages++;
|
|
else if (IS_OVERFLOW(&dp->p)) {
|
|
txn->mt_dbs[dbi].md_overflow_pages += num;
|
|
dp->p.mp_pages = num;
|
|
}
|
|
|
|
return dp;
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
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_txn *txn, MDB_dbi dbi, MDB_page *mp, 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_dpage *ofp = NULL; /* overflow page */
|
|
|
|
assert(mp->mp_upper >= mp->mp_lower);
|
|
|
|
DPRINTF("add node [%.*s] to %s page %lu at index %i, key size %zu",
|
|
key ? (int)key->mv_size : 0, key ? (char *)key->mv_data : NULL,
|
|
IS_LEAF(mp) ? "leaf" : "branch",
|
|
mp->mp_pgno, indx, key ? key->mv_size : 0);
|
|
|
|
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 >= txn->mt_env->me_psize / MDB_MINKEYS) {
|
|
int ovpages = OVPAGES(data->mv_size, 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(txn, dbi, P_OVERFLOW, ovpages)) == NULL)
|
|
return ENOMEM;
|
|
DPRINTF("allocated overflow page %lu", ofp->p.mp_pgno);
|
|
flags |= F_BIGDATA;
|
|
} else {
|
|
node_size += data->mv_size;
|
|
}
|
|
}
|
|
|
|
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))
|
|
node->mn_dsize = data->mv_size;
|
|
else
|
|
node->mn_pgno = 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->p.mp_pgno,
|
|
sizeof(pgno_t));
|
|
memcpy(METADATA(&ofp->p), data->mv_data, data->mv_size);
|
|
}
|
|
}
|
|
|
|
return MDB_SUCCESS;
|
|
}
|
|
|
|
static void
|
|
mdb_del_node(MDB_page *mp, indx_t indx)
|
|
{
|
|
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));
|
|
|
|
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);
|
|
}
|
|
|
|
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_txn *txn, MDB_dbi dbi, MDB_xcursor *mx)
|
|
{
|
|
MDB_dbi dbn;
|
|
|
|
mx->mx_txn = *txn;
|
|
mx->mx_txn.mt_dbxs = mx->mx_dbxs;
|
|
mx->mx_txn.mt_dbs = mx->mx_dbs;
|
|
mx->mx_dbxs[0] = txn->mt_dbxs[0];
|
|
mx->mx_dbxs[1] = txn->mt_dbxs[1];
|
|
if (dbi > 1) {
|
|
mx->mx_dbxs[2] = txn->mt_dbxs[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_cursor.mc_snum = 0;
|
|
mx->mx_cursor.mc_txn = &mx->mx_txn;
|
|
mx->mx_cursor.mc_dbi = dbn+1;
|
|
}
|
|
|
|
static void
|
|
mdb_xcursor_init1(MDB_txn *txn, MDB_dbi dbi, MDB_xcursor *mx, MDB_node *node)
|
|
{
|
|
MDB_db *db = NODEDATA(node);
|
|
MDB_dbi dbn;
|
|
mx->mx_dbs[0] = txn->mt_dbs[0];
|
|
mx->mx_dbs[1] = txn->mt_dbs[1];
|
|
if (dbi > 1) {
|
|
mx->mx_dbs[2] = txn->mt_dbs[dbi];
|
|
dbn = 3;
|
|
} else {
|
|
dbn = 2;
|
|
}
|
|
mx->mx_dbs[dbn] = *db;
|
|
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 = txn->mt_next_pgno;
|
|
mx->mx_txn.mt_oldest = txn->mt_oldest;
|
|
mx->mx_txn.mt_u = txn->mt_u;
|
|
}
|
|
|
|
static void
|
|
mdb_xcursor_fini(MDB_txn *txn, MDB_dbi dbi, MDB_xcursor *mx)
|
|
{
|
|
txn->mt_next_pgno = mx->mx_txn.mt_next_pgno;
|
|
txn->mt_oldest = mx->mx_txn.mt_oldest;
|
|
txn->mt_u = mx->mx_txn.mt_u;
|
|
txn->mt_dbs[0] = mx->mx_dbs[0];
|
|
txn->mt_dbs[1] = mx->mx_dbs[1];
|
|
txn->mt_dbxs[0].md_dirty = mx->mx_dbxs[0].md_dirty;
|
|
txn->mt_dbxs[1].md_dirty = mx->mx_dbxs[1].md_dirty;
|
|
if (dbi > 1) {
|
|
txn->mt_dbs[dbi] = mx->mx_dbs[2];
|
|
txn->mt_dbxs[dbi].md_dirty = mx->mx_dbxs[2].md_dirty;
|
|
}
|
|
}
|
|
|
|
int
|
|
mdb_cursor_open(MDB_txn *txn, MDB_dbi dbi, MDB_cursor **ret)
|
|
{
|
|
MDB_cursor *cursor;
|
|
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 ((cursor = calloc(1, size)) != NULL) {
|
|
cursor->mc_dbi = dbi;
|
|
cursor->mc_txn = txn;
|
|
if (txn->mt_dbs[dbi].md_flags & MDB_DUPSORT) {
|
|
MDB_xcursor *mx = (MDB_xcursor *)(cursor + 1);
|
|
cursor->mc_xcursor = mx;
|
|
mdb_xcursor_init0(txn, dbi, mx);
|
|
}
|
|
} else {
|
|
return ENOMEM;
|
|
}
|
|
|
|
*ret = cursor;
|
|
|
|
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_ppage *top;
|
|
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;
|
|
|
|
top = CURSOR_TOP(mc);
|
|
leaf = NODEPTR(top->mp_page, top->mp_ki);
|
|
if (!F_ISSET(leaf->mn_flags, F_DUPDATA)) {
|
|
*countp = 1;
|
|
} else {
|
|
if (!mc->mc_xcursor->mx_cursor.mc_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 *cursor)
|
|
{
|
|
if (cursor != NULL) {
|
|
free(cursor);
|
|
}
|
|
}
|
|
|
|
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;
|
|
|
|
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),
|
|
(int)key->mv_size, (char *)key->mv_data,
|
|
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 src to dst.
|
|
*/
|
|
static int
|
|
mdb_move_node(MDB_txn *txn, MDB_dbi dbi, MDB_pageparent *src, indx_t srcindx,
|
|
MDB_pageparent *dst, indx_t dstindx)
|
|
{
|
|
int rc;
|
|
MDB_node *srcnode;
|
|
MDB_val key, data;
|
|
|
|
srcnode = NODEPTR(src->mp_page, srcindx);
|
|
DPRINTF("moving %s node %u [%.*s] on page %lu to node %u on page %lu",
|
|
IS_LEAF(src->mp_page) ? "leaf" : "branch",
|
|
srcindx,
|
|
(int)srcnode->mn_ksize, (char *)NODEKEY(srcnode),
|
|
src->mp_page->mp_pgno,
|
|
dstindx, dst->mp_page->mp_pgno);
|
|
|
|
/* Mark src and dst as dirty. */
|
|
if ((rc = mdb_touch(txn, src)) ||
|
|
(rc = mdb_touch(txn, dst)))
|
|
return rc;;
|
|
|
|
/* Add the node to the destination page.
|
|
*/
|
|
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(txn, dbi, dst->mp_page, dstindx, &key, &data, NODEPGNO(srcnode),
|
|
srcnode->mn_flags);
|
|
if (rc != MDB_SUCCESS)
|
|
return rc;
|
|
|
|
/* Delete the node from the source page.
|
|
*/
|
|
mdb_del_node(src->mp_page, srcindx);
|
|
|
|
/* Update the parent separators.
|
|
*/
|
|
if (srcindx == 0 && src->mp_pi != 0) {
|
|
DPRINTF("update separator for source page %lu to [%.*s]",
|
|
src->mp_page->mp_pgno, (int)key.mv_size, (char *)key.mv_data);
|
|
if ((rc = mdb_update_key(src->mp_parent, src->mp_pi,
|
|
&key)) != MDB_SUCCESS)
|
|
return rc;
|
|
}
|
|
|
|
if (srcindx == 0 && IS_BRANCH(src->mp_page)) {
|
|
MDB_val nullkey;
|
|
nullkey.mv_size = 0;
|
|
assert(mdb_update_key(src->mp_page, 0, &nullkey) == MDB_SUCCESS);
|
|
}
|
|
|
|
if (dstindx == 0 && dst->mp_pi != 0) {
|
|
DPRINTF("update separator for destination page %lu to [%.*s]",
|
|
dst->mp_page->mp_pgno, (int)key.mv_size, (char *)key.mv_data);
|
|
if ((rc = mdb_update_key(dst->mp_parent, dst->mp_pi,
|
|
&key)) != MDB_SUCCESS)
|
|
return rc;
|
|
}
|
|
|
|
if (dstindx == 0 && IS_BRANCH(dst->mp_page)) {
|
|
MDB_val nullkey;
|
|
nullkey.mv_size = 0;
|
|
assert(mdb_update_key(dst->mp_page, 0, &nullkey) == MDB_SUCCESS);
|
|
}
|
|
|
|
return MDB_SUCCESS;
|
|
}
|
|
|
|
static int
|
|
mdb_merge(MDB_txn *txn, MDB_dbi dbi, MDB_pageparent *src, MDB_pageparent *dst)
|
|
{
|
|
int rc;
|
|
indx_t i;
|
|
MDB_node *srcnode;
|
|
MDB_val key, data;
|
|
MDB_pageparent mpp;
|
|
MDB_dhead *dh;
|
|
|
|
DPRINTF("merging page %lu and %lu", src->mp_page->mp_pgno, dst->mp_page->mp_pgno);
|
|
|
|
assert(txn != NULL);
|
|
assert(src->mp_parent); /* can't merge root page */
|
|
assert(dst->mp_parent);
|
|
|
|
/* Mark src and dst as dirty. */
|
|
if ((rc = mdb_touch(txn, src)) ||
|
|
(rc = mdb_touch(txn, dst)))
|
|
return rc;
|
|
|
|
/* Move all nodes from src to dst.
|
|
*/
|
|
for (i = 0; i < NUMKEYS(src->mp_page); i++) {
|
|
srcnode = NODEPTR(src->mp_page, 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(txn, dbi, dst->mp_page, NUMKEYS(dst->mp_page), &key,
|
|
&data, NODEPGNO(srcnode), srcnode->mn_flags);
|
|
if (rc != MDB_SUCCESS)
|
|
return rc;
|
|
}
|
|
|
|
DPRINTF("dst page %lu now has %u keys (%.1f%% filled)",
|
|
dst->mp_page->mp_pgno, NUMKEYS(dst->mp_page), (float)PAGEFILL(txn->mt_env, dst->mp_page) / 10);
|
|
|
|
/* Unlink the src page from parent.
|
|
*/
|
|
mdb_del_node(src->mp_parent, src->mp_pi);
|
|
if (src->mp_pi == 0) {
|
|
key.mv_size = 0;
|
|
if ((rc = mdb_update_key(src->mp_parent, 0, &key)) != MDB_SUCCESS)
|
|
return rc;
|
|
}
|
|
|
|
if (IS_LEAF(src->mp_page))
|
|
txn->mt_dbs[dbi].md_leaf_pages--;
|
|
else
|
|
txn->mt_dbs[dbi].md_branch_pages--;
|
|
|
|
mpp.mp_page = src->mp_parent;
|
|
dh = (MDB_dhead *)src->mp_parent;
|
|
dh--;
|
|
mpp.mp_parent = dh->md_parent;
|
|
mpp.mp_pi = dh->md_pi;
|
|
|
|
return mdb_rebalance(txn, dbi, &mpp);
|
|
}
|
|
|
|
#define FILL_THRESHOLD 250
|
|
|
|
static int
|
|
mdb_rebalance(MDB_txn *txn, MDB_dbi dbi, MDB_pageparent *mpp)
|
|
{
|
|
MDB_node *node;
|
|
MDB_page *root;
|
|
MDB_pageparent npp;
|
|
indx_t si = 0, di = 0;
|
|
|
|
assert(txn != NULL);
|
|
assert(mpp != NULL);
|
|
|
|
DPRINTF("rebalancing %s page %lu (has %u keys, %.1f%% full)",
|
|
IS_LEAF(mpp->mp_page) ? "leaf" : "branch",
|
|
mpp->mp_page->mp_pgno, NUMKEYS(mpp->mp_page), (float)PAGEFILL(txn->mt_env, mpp->mp_page) / 10);
|
|
|
|
if (PAGEFILL(txn->mt_env, mpp->mp_page) >= FILL_THRESHOLD) {
|
|
DPRINTF("no need to rebalance page %lu, above fill threshold",
|
|
mpp->mp_page->mp_pgno);
|
|
return MDB_SUCCESS;
|
|
}
|
|
|
|
if (mpp->mp_parent == NULL) {
|
|
if (NUMKEYS(mpp->mp_page) == 0) {
|
|
DPUTS("tree is completely empty");
|
|
txn->mt_dbs[dbi].md_root = P_INVALID;
|
|
txn->mt_dbs[dbi].md_depth--;
|
|
txn->mt_dbs[dbi].md_leaf_pages--;
|
|
} else if (IS_BRANCH(mpp->mp_page) && NUMKEYS(mpp->mp_page) == 1) {
|
|
DPUTS("collapsing root page!");
|
|
txn->mt_dbs[dbi].md_root = NODEPGNO(NODEPTR(mpp->mp_page, 0));
|
|
if ((root = mdb_get_page(txn, txn->mt_dbs[dbi].md_root)) == NULL)
|
|
return MDB_PAGE_NOTFOUND;
|
|
txn->mt_dbs[dbi].md_depth--;
|
|
txn->mt_dbs[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.
|
|
*/
|
|
assert(NUMKEYS(mpp->mp_parent) > 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.
|
|
*/
|
|
if (mpp->mp_pi == 0) {
|
|
/* We're the leftmost leaf in our parent.
|
|
*/
|
|
DPUTS("reading right neighbor");
|
|
node = NODEPTR(mpp->mp_parent, mpp->mp_pi + 1);
|
|
if ((npp.mp_page = mdb_get_page(txn, NODEPGNO(node))) == NULL)
|
|
return MDB_PAGE_NOTFOUND;
|
|
npp.mp_pi = mpp->mp_pi + 1;
|
|
si = 0;
|
|
di = NUMKEYS(mpp->mp_page);
|
|
} else {
|
|
/* There is at least one neighbor to the left.
|
|
*/
|
|
DPUTS("reading left neighbor");
|
|
node = NODEPTR(mpp->mp_parent, mpp->mp_pi - 1);
|
|
if ((npp.mp_page = mdb_get_page(txn, NODEPGNO(node))) == NULL)
|
|
return MDB_PAGE_NOTFOUND;
|
|
npp.mp_pi = mpp->mp_pi - 1;
|
|
si = NUMKEYS(npp.mp_page) - 1;
|
|
di = 0;
|
|
}
|
|
npp.mp_parent = mpp->mp_parent;
|
|
|
|
DPRINTF("found neighbor page %lu (%u keys, %.1f%% full)",
|
|
npp.mp_page->mp_pgno, NUMKEYS(npp.mp_page), (float)PAGEFILL(txn->mt_env, npp.mp_page) / 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(txn->mt_env, npp.mp_page) >= FILL_THRESHOLD && NUMKEYS(npp.mp_page) >= 2)
|
|
return mdb_move_node(txn, dbi, &npp, si, mpp, di);
|
|
else { /* FIXME: if (has_enough_room()) */
|
|
if (mpp->mp_pi == 0)
|
|
return mdb_merge(txn, dbi, &npp, mpp);
|
|
else
|
|
return mdb_merge(txn, dbi, mpp, &npp);
|
|
}
|
|
}
|
|
|
|
static int
|
|
mdb_del0(MDB_txn *txn, MDB_dbi dbi, unsigned int ki, MDB_pageparent *mpp, MDB_node *leaf)
|
|
{
|
|
int rc;
|
|
|
|
/* add overflow pages to free list */
|
|
if (F_ISSET(leaf->mn_flags, F_BIGDATA)) {
|
|
int i, ovpages;
|
|
pgno_t pg;
|
|
|
|
memcpy(&pg, NODEDATA(leaf), sizeof(pg));
|
|
ovpages = OVPAGES(NODEDSZ(leaf), txn->mt_env->me_psize);
|
|
for (i=0; i<ovpages; i++) {
|
|
DPRINTF("freed ov page %lu", pg);
|
|
mdb_midl_insert(txn->mt_free_pgs, pg);
|
|
pg++;
|
|
}
|
|
}
|
|
mdb_del_node(mpp->mp_page, ki);
|
|
txn->mt_dbs[dbi].md_entries--;
|
|
rc = mdb_rebalance(txn, dbi, mpp);
|
|
if (rc != MDB_SUCCESS)
|
|
txn->mt_flags |= MDB_TXN_ERROR;
|
|
|
|
return rc;
|
|
}
|
|
|
|
int
|
|
mdb_del(MDB_txn *txn, MDB_dbi dbi,
|
|
MDB_val *key, MDB_val *data,
|
|
unsigned int flags)
|
|
{
|
|
int rc, exact;
|
|
unsigned int ki;
|
|
MDB_node *leaf;
|
|
MDB_pageparent mpp;
|
|
|
|
DPRINTF("========> delete key %.*s", (int)key->mv_size, (char *)key->mv_data);
|
|
|
|
assert(key != NULL);
|
|
|
|
if (txn == NULL || !dbi || dbi >= txn->mt_numdbs)
|
|
return EINVAL;
|
|
|
|
if (F_ISSET(txn->mt_flags, MDB_TXN_RDONLY)) {
|
|
return EINVAL;
|
|
}
|
|
|
|
if (key->mv_size == 0 || key->mv_size > MAXKEYSIZE) {
|
|
return EINVAL;
|
|
}
|
|
|
|
mpp.mp_parent = NULL;
|
|
mpp.mp_pi = 0;
|
|
if ((rc = mdb_search_page(txn, dbi, key, NULL, 1, &mpp)) != MDB_SUCCESS)
|
|
return rc;
|
|
|
|
leaf = mdb_search_node(txn, dbi, mpp.mp_page, key, &exact, &ki);
|
|
if (leaf == NULL || !exact) {
|
|
return MDB_NOTFOUND;
|
|
}
|
|
|
|
if (F_ISSET(leaf->mn_flags, F_DUPDATA)) {
|
|
MDB_xcursor mx;
|
|
MDB_pageparent mp2;
|
|
|
|
mdb_xcursor_init0(txn, dbi, &mx);
|
|
mdb_xcursor_init1(txn, dbi, &mx, leaf);
|
|
if (flags == MDB_DEL_DUP) {
|
|
rc = mdb_del(&mx.mx_txn, mx.mx_cursor.mc_dbi, data, NULL, 0);
|
|
mdb_xcursor_fini(txn, dbi, &mx);
|
|
if (rc != MDB_SUCCESS)
|
|
return rc;
|
|
/* If sub-DB still has entries, we're done */
|
|
if (mx.mx_txn.mt_dbs[mx.mx_cursor.mc_dbi].md_root != P_INVALID) {
|
|
memcpy(NODEDATA(leaf), &mx.mx_txn.mt_dbs[mx.mx_cursor.mc_dbi],
|
|
sizeof(MDB_db));
|
|
txn->mt_dbs[dbi].md_entries--;
|
|
return rc;
|
|
}
|
|
/* otherwise fall thru and delete the sub-DB */
|
|
} else {
|
|
/* add all the child DB's pages to the free list */
|
|
rc = mdb_search_page(&mx.mx_txn, mx.mx_cursor.mc_dbi,
|
|
NULL, &mx.mx_cursor, 0, &mp2);
|
|
if (rc == MDB_SUCCESS) {
|
|
MDB_ppage *top, *parent;
|
|
MDB_node *ni;
|
|
unsigned int i;
|
|
|
|
cursor_pop_page(&mx.mx_cursor);
|
|
if (mx.mx_cursor.mc_snum) {
|
|
top = CURSOR_TOP(&mx.mx_cursor);
|
|
while (mx.mx_cursor.mc_snum > 1) {
|
|
parent = CURSOR_PARENT(&mx.mx_cursor);
|
|
for (i=0; i<NUMKEYS(top->mp_page); i++) {
|
|
ni = NODEPTR(top->mp_page, i);
|
|
mdb_midl_insert(txn->mt_free_pgs, ni->mn_pgno);
|
|
}
|
|
parent->mp_ki++;
|
|
if (parent->mp_ki >= NUMKEYS(parent->mp_page)) {
|
|
cursor_pop_page(&mx.mx_cursor);
|
|
top = parent;
|
|
} else {
|
|
ni = NODEPTR(parent->mp_page, parent->mp_ki);
|
|
top->mp_page = mdb_get_page(&mx.mx_txn, ni->mn_pgno);
|
|
}
|
|
}
|
|
}
|
|
mdb_midl_insert(txn->mt_free_pgs, mx.mx_txn.mt_dbs[mx.mx_cursor.mc_dbi].md_root);
|
|
}
|
|
}
|
|
}
|
|
|
|
if (data && (rc = mdb_read_data(txn, leaf, data)) != MDB_SUCCESS)
|
|
return rc;
|
|
|
|
return mdb_del0(txn, dbi, ki, &mpp, leaf);
|
|
}
|
|
|
|
/* Split page <*mpp>, and insert <key,(data|newpgno)> in either left or
|
|
* right sibling, at index <*newindxp> (as if unsplit). Updates *mpp and
|
|
* *newindxp with the actual values after split, ie if *mpp and *newindxp
|
|
* refer to a node in the new right sibling page.
|
|
*/
|
|
static int
|
|
mdb_split(MDB_txn *txn, MDB_dbi dbi, MDB_page **mpp, unsigned int *newindxp,
|
|
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;
|
|
MDB_node *node;
|
|
MDB_val sepkey, rkey, rdata;
|
|
MDB_page *copy;
|
|
MDB_dpage *mdp, *rdp, *pdp;
|
|
MDB_dhead *dh;
|
|
|
|
assert(txn != NULL);
|
|
|
|
dh = ((MDB_dhead *)*mpp) - 1;
|
|
mdp = (MDB_dpage *)dh;
|
|
newindx = *newindxp;
|
|
|
|
DPRINTF("-----> splitting %s page %lu and adding [%.*s] at index %i",
|
|
IS_LEAF(&mdp->p) ? "leaf" : "branch", mdp->p.mp_pgno,
|
|
(int)newkey->mv_size, (char *)newkey->mv_data, *newindxp);
|
|
|
|
if (mdp->h.md_parent == NULL) {
|
|
if ((pdp = mdb_new_page(txn, dbi, P_BRANCH, 1)) == NULL)
|
|
return ENOMEM;
|
|
mdp->h.md_pi = 0;
|
|
mdp->h.md_parent = &pdp->p;
|
|
txn->mt_dbs[dbi].md_root = pdp->p.mp_pgno;
|
|
DPRINTF("root split! new root = %lu", pdp->p.mp_pgno);
|
|
txn->mt_dbs[dbi].md_depth++;
|
|
|
|
/* Add left (implicit) pointer. */
|
|
if ((rc = mdb_add_node(txn, dbi, &pdp->p, 0, NULL, NULL,
|
|
mdp->p.mp_pgno, 0)) != MDB_SUCCESS)
|
|
return rc;
|
|
} else {
|
|
DPRINTF("parent branch page is %lu", mdp->h.md_parent->mp_pgno);
|
|
}
|
|
|
|
/* Create a right sibling. */
|
|
if ((rdp = mdb_new_page(txn, dbi, mdp->p.mp_flags, 1)) == NULL)
|
|
return ENOMEM;
|
|
rdp->h.md_parent = mdp->h.md_parent;
|
|
rdp->h.md_pi = mdp->h.md_pi + 1;
|
|
DPRINTF("new right sibling: page %lu", rdp->p.mp_pgno);
|
|
|
|
/* Move half of the keys to the right sibling. */
|
|
if ((copy = malloc(txn->mt_env->me_psize)) == NULL)
|
|
return ENOMEM;
|
|
memcpy(copy, &mdp->p, txn->mt_env->me_psize);
|
|
memset(&mdp->p.mp_ptrs, 0, txn->mt_env->me_psize - PAGEHDRSZ);
|
|
mdp->p.mp_lower = PAGEHDRSZ;
|
|
mdp->p.mp_upper = txn->mt_env->me_psize;
|
|
|
|
split_indx = NUMKEYS(copy) / 2 + 1;
|
|
|
|
/* First find the separating key between the split pages.
|
|
*/
|
|
memset(&sepkey, 0, sizeof(sepkey));
|
|
if (newindx == split_indx) {
|
|
sepkey.mv_size = newkey->mv_size;
|
|
sepkey.mv_data = newkey->mv_data;
|
|
} else {
|
|
node = NODEPTR(copy, split_indx);
|
|
sepkey.mv_size = node->mn_ksize;
|
|
sepkey.mv_data = NODEKEY(node);
|
|
}
|
|
|
|
DPRINTF("separator is [%.*s]", (int)sepkey.mv_size, (char *)sepkey.mv_data);
|
|
|
|
/* Copy separator key to the parent.
|
|
*/
|
|
if (SIZELEFT(rdp->h.md_parent) < mdb_branch_size(txn->mt_env, &sepkey)) {
|
|
rc = mdb_split(txn, dbi, &rdp->h.md_parent, &rdp->h.md_pi,
|
|
&sepkey, NULL, rdp->p.mp_pgno);
|
|
|
|
/* Right page might now have changed parent.
|
|
* Check if left page also changed parent.
|
|
*/
|
|
if (rdp->h.md_parent != mdp->h.md_parent &&
|
|
mdp->h.md_pi >= NUMKEYS(mdp->h.md_parent)) {
|
|
mdp->h.md_parent = rdp->h.md_parent;
|
|
mdp->h.md_pi = rdp->h.md_pi - 1;
|
|
}
|
|
} else {
|
|
rc = mdb_add_node(txn, dbi, rdp->h.md_parent, rdp->h.md_pi,
|
|
&sepkey, NULL, rdp->p.mp_pgno, 0);
|
|
}
|
|
if (rc != MDB_SUCCESS) {
|
|
free(copy);
|
|
return rc;
|
|
}
|
|
|
|
for (i = j = 0; i <= NUMKEYS(copy); j++) {
|
|
if (i < split_indx) {
|
|
/* Re-insert in left sibling. */
|
|
pdp = mdp;
|
|
} else {
|
|
/* Insert in right sibling. */
|
|
if (i == split_indx)
|
|
/* Reset insert index for right sibling. */
|
|
j = (i == newindx && ins_new);
|
|
pdp = rdp;
|
|
}
|
|
|
|
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(&mdp->p)) {
|
|
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. */
|
|
*newindxp = j;
|
|
*mpp = &pdp->p;
|
|
} else if (i == NUMKEYS(copy)) {
|
|
break;
|
|
} else {
|
|
node = NODEPTR(copy, i);
|
|
rkey.mv_data = NODEKEY(node);
|
|
rkey.mv_size = node->mn_ksize;
|
|
if (IS_LEAF(&mdp->p)) {
|
|
rdata.mv_data = NODEDATA(node);
|
|
rdata.mv_size = node->mn_dsize;
|
|
} else
|
|
pgno = node->mn_pgno;
|
|
flags = node->mn_flags;
|
|
|
|
i++;
|
|
}
|
|
|
|
if (!IS_LEAF(&mdp->p) && j == 0) {
|
|
/* First branch index doesn't need key data. */
|
|
rkey.mv_size = 0;
|
|
}
|
|
|
|
rc = mdb_add_node(txn, dbi, &pdp->p, j, &rkey, &rdata, pgno,flags);
|
|
}
|
|
|
|
free(copy);
|
|
return rc;
|
|
}
|
|
|
|
static int
|
|
mdb_put0(MDB_txn *txn, MDB_dbi dbi,
|
|
MDB_val *key, MDB_val *data, unsigned int flags)
|
|
{
|
|
int rc = MDB_SUCCESS, exact;
|
|
unsigned int ki;
|
|
MDB_node *leaf;
|
|
MDB_pageparent mpp;
|
|
MDB_val xdata, *rdata, dkey;
|
|
MDB_db dummy;
|
|
char dbuf[PAGESIZE];
|
|
int do_sub = 0;
|
|
|
|
DPRINTF("==> put key %.*s, size %zu, data size %zu",
|
|
(int)key->mv_size, (char *)key->mv_data, key->mv_size, data->mv_size);
|
|
|
|
dkey.mv_size = 0;
|
|
mpp.mp_parent = NULL;
|
|
mpp.mp_pi = 0;
|
|
rc = mdb_search_page(txn, dbi, key, NULL, 1, &mpp);
|
|
if (rc == MDB_SUCCESS) {
|
|
leaf = mdb_search_node(txn, dbi, mpp.mp_page, key, &exact, &ki);
|
|
if (leaf && exact) {
|
|
if (flags == MDB_NOOVERWRITE) {
|
|
DPRINTF("duplicate key %.*s",
|
|
(int)key->mv_size, (char *)key->mv_data);
|
|
return MDB_KEYEXIST;
|
|
}
|
|
if (F_ISSET(txn->mt_dbs[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);
|
|
memcpy(dbuf, NODEDATA(leaf), dkey.mv_size);
|
|
memset(&dummy, 0, sizeof(dummy));
|
|
dummy.md_root = P_INVALID;
|
|
if (dkey.mv_size == sizeof(MDB_db)) {
|
|
memcpy(NODEDATA(leaf), &dummy, sizeof(dummy));
|
|
goto put_sub;
|
|
}
|
|
mdb_del_node(mpp.mp_page, ki);
|
|
do_sub = 1;
|
|
rdata = &xdata;
|
|
xdata.mv_size = sizeof(MDB_db);
|
|
xdata.mv_data = &dummy;
|
|
goto new_sub;
|
|
}
|
|
goto put_sub;
|
|
}
|
|
/* same size, just replace it */
|
|
if (NODEDSZ(leaf) == data->mv_size) {
|
|
memcpy(NODEDATA(leaf), data->mv_data, data->mv_size);
|
|
goto done;
|
|
}
|
|
mdb_del_node(mpp.mp_page, ki);
|
|
}
|
|
if (leaf == NULL) { /* append if not found */
|
|
ki = NUMKEYS(mpp.mp_page);
|
|
DPRINTF("appending key at index %i", ki);
|
|
}
|
|
} else if (rc == MDB_NOTFOUND) {
|
|
MDB_dpage *dp;
|
|
/* new file, just write a root leaf page */
|
|
DPUTS("allocating new root leaf page");
|
|
if ((dp = mdb_new_page(txn, dbi, P_LEAF, 1)) == NULL) {
|
|
return ENOMEM;
|
|
}
|
|
mpp.mp_page = &dp->p;
|
|
txn->mt_dbs[dbi].md_root = mpp.mp_page->mp_pgno;
|
|
txn->mt_dbs[dbi].md_depth++;
|
|
txn->mt_dbxs[dbi].md_dirty = 1;
|
|
ki = 0;
|
|
}
|
|
else
|
|
goto done;
|
|
|
|
assert(IS_LEAF(mpp.mp_page));
|
|
DPRINTF("there are %u keys, should insert new key at index %i",
|
|
NUMKEYS(mpp.mp_page), ki);
|
|
|
|
rdata = data;
|
|
|
|
new_sub:
|
|
if (SIZELEFT(mpp.mp_page) < mdb_leaf_size(txn->mt_env, key, rdata)) {
|
|
rc = mdb_split(txn, dbi, &mpp.mp_page, &ki, key, rdata, P_INVALID);
|
|
} else {
|
|
/* There is room already in this leaf page. */
|
|
rc = mdb_add_node(txn, dbi, mpp.mp_page, ki, key, rdata, 0, 0);
|
|
}
|
|
|
|
if (rc != MDB_SUCCESS)
|
|
txn->mt_flags |= MDB_TXN_ERROR;
|
|
else {
|
|
/* Remember if we just added a subdatabase */
|
|
if (flags & F_SUBDATA) {
|
|
leaf = NODEPTR(mpp.mp_page, ki);
|
|
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) {
|
|
MDB_xcursor mx;
|
|
|
|
leaf = NODEPTR(mpp.mp_page, ki);
|
|
put_sub:
|
|
mdb_xcursor_init0(txn, dbi, &mx);
|
|
mdb_xcursor_init1(txn, dbi, &mx, 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) {
|
|
dkey.mv_data = dbuf;
|
|
rc = mdb_put0(&mx.mx_txn, mx.mx_cursor.mc_dbi, &dkey, &xdata, flags);
|
|
if (rc) return rc;
|
|
leaf->mn_flags |= F_DUPDATA;
|
|
}
|
|
rc = mdb_put0(&mx.mx_txn, mx.mx_cursor.mc_dbi, data, &xdata, flags);
|
|
mdb_xcursor_fini(txn, dbi, &mx);
|
|
memcpy(NODEDATA(leaf), &mx.mx_txn.mt_dbs[mx.mx_cursor.mc_dbi],
|
|
sizeof(MDB_db));
|
|
}
|
|
txn->mt_dbs[dbi].md_entries++;
|
|
}
|
|
|
|
done:
|
|
return rc;
|
|
}
|
|
|
|
int
|
|
mdb_put(MDB_txn *txn, MDB_dbi dbi,
|
|
MDB_val *key, MDB_val *data, unsigned int flags)
|
|
{
|
|
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 EINVAL;
|
|
}
|
|
|
|
if (key->mv_size == 0 || key->mv_size > MAXKEYSIZE) {
|
|
return EINVAL;
|
|
}
|
|
|
|
if ((flags & (MDB_NOOVERWRITE|MDB_NODUPDATA)) != flags)
|
|
return EINVAL;
|
|
|
|
return mdb_put0(txn, dbi, key, data, flags);
|
|
}
|
|
|
|
int
|
|
mdb_env_set_flags(MDB_env *env, unsigned int flag, int onoff)
|
|
{
|
|
#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)
|
|
{
|
|
if (env == NULL || arg == NULL)
|
|
return EINVAL;
|
|
|
|
return mdb_stat0(env, &env->me_meta->mm_dbs[MAIN_DBI], arg);
|
|
}
|
|
|
|
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;
|
|
|
|
/* 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));
|
|
return MDB_SUCCESS;
|
|
}
|
|
|
|
/* 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_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;
|
|
rc = mdb_put0(txn, MAIN_DBI, &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_cmp = NULL;
|
|
txn->mt_dbxs[txn->mt_numdbs].md_dcmp = NULL;
|
|
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];
|
|
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;
|
|
}
|
|
|