diff --git a/libraries/libmdb/mdb.c b/libraries/libmdb/mdb.c deleted file mode 100644 index bd39a20..0000000 --- a/libraries/libmdb/mdb.c +++ /dev/null @@ -1,3678 +0,0 @@ -/* mdb.c - memory-mapped database library */ -/* - * Copyright 2011 Howard Chu, Symas Corp. - * All rights reserved. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted only as authorized by the OpenLDAP - * Public License. - * - * A copy of this license is available in the file LICENSE in the - * top-level directory of the distribution or, alternatively, at - * . - * - * This code is derived from btree.c written by Martin Hedenfalk. - * - * Copyright (c) 2009, 2010 Martin Hedenfalk - * - * Permission to use, copy, modify, and distribute this software for any - * purpose with or without fee is hereby granted, provided that the above - * copyright notice and this permission notice appear in all copies. - * - * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES - * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF - * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR - * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES - * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN - * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF - * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. - */ -#include -#include -#include -#include -#include -#ifdef HAVE_SYS_FILE_H -#include -#endif -#include - -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include - -#include "mdb.h" - -#define ULONG unsigned long -typedef ULONG pgno_t; - -#include "midl.h" - -/* Note: If O_DSYNC is undefined but exists in /usr/include, - * preferably set some compiler flag to get the definition. - * Otherwise compile with the less efficient -DMDB_DSYNC=O_SYNC. - */ -#ifndef MDB_DSYNC -# define MDB_DSYNC O_DSYNC -#endif - -#ifndef DEBUG -#define DEBUG 1 -#endif - -#if !(__STDC_VERSION__ >= 199901L || defined(__GNUC__)) -# define DPRINTF (void) /* Vararg macros may be unsupported */ -#elif DEBUG -# define DPRINTF(fmt, ...) /* Requires 2 or more args */ \ - fprintf(stderr, "%s:%d: " fmt "\n", __func__, __LINE__, __VA_ARGS__) -#else -# define DPRINTF(fmt, ...) ((void) 0) -#endif -#define DPUTS(arg) DPRINTF("%s", arg) - -#define PAGESIZE 4096 -#define MDB_MINKEYS 2 -#define MDB_MAGIC 0xBEEFC0DE -#define MDB_VERSION 1 -#define MAXKEYSIZE 511 -#if DEBUG -#define KBUF (MAXKEYSIZE*2+1) -#define DKBUF char kbuf[KBUF] -#define DKEY(x) mdb_dkey(x, kbuf) -#else -#define DKBUF -#define DKEY(x) -#endif - -#define P_INVALID (~0UL) - -#define F_ISSET(w, f) (((w) & (f)) == (f)) - -typedef uint16_t indx_t; - -#define DEFAULT_READERS 126 -#define DEFAULT_MAPSIZE 1048576 - -/* Lock descriptor stuff */ -#ifndef CACHELINE -#define CACHELINE 64 /* most CPUs. Itanium uses 128 */ -#endif - -typedef struct MDB_rxbody { - ULONG mrb_txnid; - pid_t mrb_pid; - pthread_t mrb_tid; -} MDB_rxbody; - -typedef struct MDB_reader { - union { - MDB_rxbody mrx; -#define mr_txnid mru.mrx.mrb_txnid -#define mr_pid mru.mrx.mrb_pid -#define mr_tid mru.mrx.mrb_tid - /* cache line alignment */ - char pad[(sizeof(MDB_rxbody)+CACHELINE-1) & ~(CACHELINE-1)]; - } mru; -} MDB_reader; - -typedef struct MDB_txbody { - uint32_t mtb_magic; - uint32_t mtb_version; - pthread_mutex_t mtb_mutex; - ULONG mtb_txnid; - uint32_t mtb_numreaders; - uint32_t mtb_me_toggle; -} MDB_txbody; - -typedef struct MDB_txninfo { - union { - MDB_txbody mtb; -#define mti_magic mt1.mtb.mtb_magic -#define mti_version mt1.mtb.mtb_version -#define mti_mutex mt1.mtb.mtb_mutex -#define mti_txnid mt1.mtb.mtb_txnid -#define mti_numreaders mt1.mtb.mtb_numreaders -#define mti_me_toggle mt1.mtb.mtb_me_toggle - char pad[(sizeof(MDB_txbody)+CACHELINE-1) & ~(CACHELINE-1)]; - } mt1; - union { - pthread_mutex_t mt2_wmutex; -#define mti_wmutex mt2.mt2_wmutex - char pad[(sizeof(pthread_mutex_t)+CACHELINE-1) & ~(CACHELINE-1)]; - } mt2; - MDB_reader mti_readers[1]; -} MDB_txninfo; - -/* Common header for all page types. Overflow pages - * occupy a number of contiguous pages with no - * headers on any page after the first. - */ -typedef struct MDB_page { /* represents a page of storage */ -#define mp_pgno mp_p.p_pgno - union padded { - pgno_t p_pgno; /* page number */ - void * p_align; /* for IL32P64 */ - } mp_p; -#define P_BRANCH 0x01 /* branch page */ -#define P_LEAF 0x02 /* leaf page */ -#define P_OVERFLOW 0x04 /* overflow page */ -#define P_META 0x08 /* meta page */ -#define P_DIRTY 0x10 /* dirty page */ -#define P_LEAF2 0x20 /* DB with small, fixed size keys and no data */ - uint32_t mp_flags; -#define mp_lower mp_pb.pb.pb_lower -#define mp_upper mp_pb.pb.pb_upper -#define mp_pages mp_pb.pb_pages - union page_bounds { - struct { - indx_t pb_lower; /* lower bound of free space */ - indx_t pb_upper; /* upper bound of free space */ - } pb; - uint32_t pb_pages; /* number of overflow pages */ - } mp_pb; - indx_t mp_ptrs[1]; /* dynamic size */ -} MDB_page; - -#define PAGEHDRSZ ((unsigned) offsetof(MDB_page, mp_ptrs)) - -#define NUMKEYS(p) (((p)->mp_lower - PAGEHDRSZ) >> 1) -#define SIZELEFT(p) (indx_t)((p)->mp_upper - (p)->mp_lower) -#define PAGEFILL(env, p) (1000L * ((env)->me_psize - PAGEHDRSZ - SIZELEFT(p)) / \ - ((env)->me_psize - PAGEHDRSZ)) -#define IS_LEAF(p) F_ISSET((p)->mp_flags, P_LEAF) -#define IS_LEAF2(p) F_ISSET((p)->mp_flags, P_LEAF2) -#define IS_BRANCH(p) F_ISSET((p)->mp_flags, P_BRANCH) -#define IS_OVERFLOW(p) F_ISSET((p)->mp_flags, P_OVERFLOW) - -#define OVPAGES(size, psize) ((PAGEHDRSZ-1 + (size)) / (psize) + 1) - -typedef struct MDB_db { - uint32_t md_pad; /* also ksize for LEAF2 pages */ - uint16_t md_flags; - uint16_t md_depth; - ULONG md_branch_pages; - ULONG md_leaf_pages; - ULONG md_overflow_pages; - ULONG md_entries; - pgno_t md_root; -} MDB_db; - -#define FREE_DBI 0 -#define MAIN_DBI 1 - -typedef struct MDB_meta { /* meta (footer) page content */ - uint32_t mm_magic; - uint32_t mm_version; - void *mm_address; /* address for fixed mapping */ - size_t mm_mapsize; /* size of mmap region */ - MDB_db mm_dbs[2]; /* first is free space, 2nd is main db */ -#define mm_psize mm_dbs[0].md_pad -#define mm_flags mm_dbs[0].md_flags - pgno_t mm_last_pg; /* last used page in file */ - ULONG mm_txnid; /* txnid that committed this page */ -} MDB_meta; - -typedef struct MDB_dhead { /* a dirty page */ - MDB_page *md_parent; - unsigned md_pi; /* parent index */ - int md_num; -} MDB_dhead; - -typedef struct MDB_dpage { - MDB_dhead h; - MDB_page p; -} MDB_dpage; - -typedef struct MDB_oldpages { - struct MDB_oldpages *mo_next; - ULONG mo_txnid; - pgno_t mo_pages[1]; /* dynamic */ -} MDB_oldpages; - -typedef struct MDB_pageparent { - MDB_page *mp_page; - MDB_page *mp_parent; - unsigned mp_pi; -} MDB_pageparent; - -static MDB_dpage *mdb_alloc_page(MDB_txn *txn, MDB_page *parent, unsigned int parent_idx, int num); -static int mdb_touch(MDB_txn *txn, MDB_pageparent *mp); - -typedef struct MDB_ppage { /* ordered list of pages */ - MDB_page *mp_page; - unsigned int mp_ki; /* cursor index on page */ -} MDB_ppage; - -#define CURSOR_TOP(c) (&(c)->mc_stack[(c)->mc_snum-1]) -#define CURSOR_PARENT(c) (&(c)->mc_stack[(c)->mc_snum-2]) - -struct MDB_xcursor; - -struct MDB_cursor { - MDB_txn *mc_txn; - MDB_ppage mc_stack[32]; /* stack of parent pages */ - unsigned int mc_snum; /* number of pushed pages */ - MDB_dbi mc_dbi; - short mc_initialized; /* 1 if initialized */ - short mc_eof; /* 1 if end is reached */ - struct MDB_xcursor *mc_xcursor; -}; - -#define METADATA(p) ((void *)((char *)(p) + PAGEHDRSZ)) - -typedef struct MDB_node { -#define mn_pgno mn_p.np_pgno -#define mn_dsize mn_p.np_dsize - union { - pgno_t np_pgno; /* child page number */ - uint32_t np_dsize; /* leaf data size */ - } mn_p; - unsigned int mn_flags:4; - unsigned int mn_ksize:12; /* key size */ -#define F_BIGDATA 0x01 /* data put on overflow page */ -#define F_SUBDATA 0x02 /* data is a sub-database */ -#define F_DUPDATA 0x04 /* data has duplicates */ - char mn_data[1]; -} MDB_node; - -typedef struct MDB_dbx { - MDB_val md_name; - MDB_cmp_func *md_cmp; /* user compare function */ - MDB_cmp_func *md_dcmp; /* user dupsort function */ - MDB_rel_func *md_rel; /* user relocate function */ - MDB_dbi md_parent; - unsigned int md_dirty; -} MDB_dbx; - -struct MDB_txn { - pgno_t mt_next_pgno; /* next unallocated page */ - ULONG mt_txnid; - ULONG mt_oldest; - MDB_env *mt_env; - pgno_t *mt_free_pgs; /* this is an IDL */ - union { - MIDL2 *dirty_list; /* modified pages */ - MDB_reader *reader; - } mt_u; - MDB_dbx *mt_dbxs; /* array */ - MDB_db *mt_dbs; - unsigned int mt_numdbs; - -#define MDB_TXN_RDONLY 0x01 /* read-only transaction */ -#define MDB_TXN_ERROR 0x02 /* an error has occurred */ -#define MDB_TXN_METOGGLE 0x04 /* used meta page 1 */ - unsigned int mt_flags; -}; - -/* Context for sorted-dup records */ -typedef struct MDB_xcursor { - MDB_cursor mx_cursor; - MDB_txn mx_txn; - MDB_dbx mx_dbxs[4]; - MDB_db mx_dbs[4]; -} MDB_xcursor; - -struct MDB_env { - int me_fd; - int me_lfd; - int me_mfd; /* just for writing the meta pages */ -#define MDB_FATAL_ERROR 0x80000000U - uint32_t me_flags; - uint32_t me_extrapad; /* unused for now */ - unsigned int me_maxreaders; - unsigned int me_numdbs; - unsigned int me_maxdbs; - char *me_path; - char *me_map; - MDB_txninfo *me_txns; - MDB_meta *me_metas[2]; - MDB_meta *me_meta; - MDB_txn *me_txn; /* current write transaction */ - size_t me_mapsize; - off_t me_size; /* current file size */ - pgno_t me_maxpg; /* me_mapsize / me_psize */ - unsigned int me_psize; - unsigned int me_db_toggle; - MDB_dbx *me_dbxs; /* array */ - MDB_db *me_dbs[2]; - MDB_oldpages *me_pghead; - pthread_key_t me_txkey; /* thread-key for readers */ - MDB_dpage *me_dpages; - pgno_t me_free_pgs[MDB_IDL_UM_SIZE]; - MIDL2 me_dirty_list[MDB_IDL_DB_SIZE]; -}; - -#define NODESIZE offsetof(MDB_node, mn_data) - -#define INDXSIZE(k) (NODESIZE + ((k) == NULL ? 0 : (k)->mv_size)) -#define LEAFSIZE(k, d) (NODESIZE + (k)->mv_size + (d)->mv_size) -#define NODEPTR(p, i) ((MDB_node *)((char *)(p) + (p)->mp_ptrs[i])) -#define NODEKEY(node) (void *)((node)->mn_data) -#define NODEDATA(node) (void *)((char *)(node)->mn_data + (node)->mn_ksize) -#define NODEPGNO(node) ((node)->mn_pgno) -#define NODEDSZ(node) ((node)->mn_dsize) -#define NODEKSZ(node) ((node)->mn_ksize) -#define LEAF2KEY(p, i, ks) ((char *)(p) + PAGEHDRSZ + ((i)*(ks))) - -#define MDB_SET_KEY(node, key) if (key!=NULL) {(key)->mv_size = NODEKSZ(node); (key)->mv_data = NODEKEY(node);} - -#define MDB_COMMIT_PAGES 64 /* max number of pages to write in one commit */ - -static int mdb_search_page_root(MDB_txn *txn, - MDB_dbi dbi, MDB_val *key, - MDB_cursor *cursor, int modify, - MDB_pageparent *mpp); -static int mdb_search_page(MDB_txn *txn, - MDB_dbi dbi, MDB_val *key, - MDB_cursor *cursor, int modify, - MDB_pageparent *mpp); - -static int mdb_env_read_header(MDB_env *env, MDB_meta *meta); -static int mdb_env_read_meta(MDB_env *env, int *which); -static int mdb_env_write_meta(MDB_txn *txn); -static MDB_page *mdb_get_page(MDB_txn *txn, pgno_t pgno); - -static MDB_node *mdb_search_node(MDB_txn *txn, MDB_dbi dbi, MDB_page *mp, - MDB_val *key, int *exactp, unsigned int *kip); -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); -static void mdb_del_node(MDB_page *mp, indx_t indx, int ksize); -static int mdb_del0(MDB_txn *txn, MDB_dbi dbi, unsigned int ki, - MDB_pageparent *mpp, MDB_node *leaf); -static int mdb_put0(MDB_txn *txn, MDB_dbi dbi, - MDB_val *key, MDB_val *data, unsigned int flags); -static int mdb_read_data(MDB_txn *txn, MDB_node *leaf, MDB_val *data); - -static int mdb_rebalance(MDB_txn *txn, MDB_dbi dbi, MDB_pageparent *mp); -static int mdb_update_key(MDB_page *mp, indx_t indx, MDB_val *key); -static int mdb_move_node(MDB_txn *txn, MDB_dbi dbi, - MDB_pageparent *src, indx_t srcindx, - MDB_pageparent *dst, indx_t dstindx); -static int mdb_merge(MDB_txn *txn, MDB_dbi dbi, MDB_pageparent *src, - MDB_pageparent *dst); -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); -static MDB_dpage *mdb_new_page(MDB_txn *txn, MDB_dbi dbi, uint32_t flags, int num); - -static void cursor_pop_page(MDB_cursor *cursor); -static MDB_ppage *cursor_push_page(MDB_cursor *cursor, - MDB_page *mp); - -static int mdb_sibling(MDB_cursor *cursor, int move_right); -static int mdb_cursor_next(MDB_cursor *cursor, - MDB_val *key, MDB_val *data, MDB_cursor_op op); -static int mdb_cursor_prev(MDB_cursor *cursor, - MDB_val *key, MDB_val *data, MDB_cursor_op op); -static int mdb_cursor_set(MDB_cursor *cursor, - MDB_val *key, MDB_val *data, MDB_cursor_op op, int *exactp); -static int mdb_cursor_first(MDB_cursor *cursor, - MDB_val *key, MDB_val *data); -static int mdb_cursor_last(MDB_cursor *cursor, - MDB_val *key, MDB_val *data); - -static void mdb_xcursor_init0(MDB_txn *txn, MDB_dbi dbi, MDB_xcursor *mx); -static void mdb_xcursor_init1(MDB_txn *txn, MDB_dbi dbi, MDB_xcursor *mx, MDB_node *node); -static void mdb_xcursor_fini(MDB_txn *txn, MDB_dbi dbi, MDB_xcursor *mx); - -static size_t mdb_leaf_size(MDB_env *env, MDB_val *key, - MDB_val *data); -static size_t mdb_branch_size(MDB_env *env, MDB_val *key); - -static int memncmp(const void *s1, size_t n1, - const void *s2, size_t n2); -static int memnrcmp(const void *s1, size_t n1, - const void *s2, size_t n2); - -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); -} - -static char * -mdb_dkey(MDB_val *key, char *buf) -{ - char *ptr = buf; - unsigned char *c = key->mv_data; - unsigned int i; - if (key->mv_size > MAXKEYSIZE) - return "MAXKEYSIZE"; - for (i=0; imv_size; i++) - ptr += sprintf(ptr, "%02x", *c++); - return buf; -} - -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); - - if (txn->mt_dbs[dbi].md_flags & (0 -#if __BYTE_ORDER == __LITTLE_ENDIAN - |MDB_INTEGERDUP -#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); -} - -/* 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; imt_env->me_pghead) { - unsigned int i; - for (i=0; imt_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; ime_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; ime_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; imt_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) { - int r2; - rc = errno; - 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; - r2 = pwrite(env->me_fd, ptr, len, off); - env->me_flags |= MDB_FATAL_ERROR; - return rc; - } - 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; ime_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 = NULL; - MDB_val nodekey; - DKBUF; - - 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; - - if (IS_LEAF2(mp)) { - nodekey.mv_size = txn->mt_dbs[dbi].md_pad; - nodekey.mv_data = LEAF2KEY(mp, i, nodekey.mv_size); - } else { - node = NODEPTR(mp, i); - - nodekey.mv_size = node->mn_ksize; - nodekey.mv_data = NODEKEY(node); - } - - rc = mdb_cmp(txn, dbi, key, &nodekey); - - if (IS_LEAF(mp)) - DPRINTF("found leaf index %u [%s], rc = %i", - i, DKEY(&nodekey), rc); - else - DPRINTF("found branch index %u [%s -> %lu], rc = %i", - i, DKEY(&nodekey), NODEPGNO(node), rc); - - 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; - - /* nodeptr is fake for LEAF2 */ - return IS_LEAF2(mp) ? NODEPTR(mp, 0) : 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 db %u cursor %p", top->mp_page->mp_pgno, - cursor->mc_dbi, (void *) cursor); - } -} - -static MDB_ppage * -cursor_push_page(MDB_cursor *cursor, MDB_page *mp) -{ - MDB_ppage *ppage; - - DPRINTF("pushing page %lu on db %u cursor %p", mp->mp_pgno, - cursor->mc_dbi, (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; - DKBUF; - 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, DKEY(key)); - 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 ? DKEY(key) : 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; - DKBUF; - - assert(key); - assert(data); - DPRINTF("===> get db %u key [%s]", dbi, DKEY(key)); - - if (txn == NULL || !dbi || dbi >= txn->mt_numdbs) - return EINVAL; - - if (key->mv_size == 0 || key->mv_size > MAXKEYSIZE) { - return EINVAL; - } - - 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; - if (IS_LEAF2(mpp.mp_page)) { - data->mv_size = txn->mt_dbs[dbi].md_pad; - data->mv_data = LEAF2KEY(mpp.mp_page, 0, data->mv_size); - } else { - leaf = NODEPTR(mpp.mp_page, 0); - data->mv_size = NODEKSZ(leaf); - data->mv_data = NODEKEY(leaf); - } - } else { - 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, NODEPGNO(indx))) == 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_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 (F_ISSET(leaf->mn_flags, F_DUPDATA)) { - if (op == MDB_NEXT || op == MDB_NEXT_DUP) { - rc = mdb_cursor_next(&cursor->mc_xcursor->mx_cursor, data, NULL, MDB_NEXT); - if (op != MDB_NEXT || rc == MDB_SUCCESS) - return rc; - } - } else { - cursor->mc_xcursor->mx_cursor.mc_initialized = 0; - if (op == MDB_NEXT_DUP) - return MDB_NOTFOUND; - } - } - - 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); - - if (IS_LEAF2(mp)) { - key->mv_size = cursor->mc_txn->mt_dbs[cursor->mc_dbi].md_pad; - key->mv_data = LEAF2KEY(mp, top->mp_ki, key->mv_size); - return MDB_SUCCESS; - } - - 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; - } - } - - MDB_SET_KEY(leaf, key); - return MDB_SUCCESS; -} - -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) { - if (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; - } else { - cursor->mc_xcursor->mx_cursor.mc_initialized = 0; - if (op == MDB_PREV_DUP) - return MDB_NOTFOUND; - } - } - } - - 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) { - cursor->mc_initialized = 0; - 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); - - if (IS_LEAF2(mp)) { - key->mv_size = cursor->mc_txn->mt_dbs[cursor->mc_dbi].md_pad; - key->mv_data = LEAF2KEY(mp, top->mp_ki, key->mv_size); - return MDB_SUCCESS; - } - - 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; - } - } - - MDB_SET_KEY(leaf, key); - return MDB_SUCCESS; -} - -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; - DKBUF; - - assert(cursor); - assert(key); - assert(key->mv_size > 0); - - /* See if we're already on the right page */ - if (cursor->mc_initialized) { - MDB_val nodekey; - top = CURSOR_TOP(cursor); - /* Don't try this for LEAF2 pages. Maybe support that later. */ - if ((top->mp_page->mp_flags & (P_LEAF|P_LEAF2)) == P_LEAF) { - leaf = NODEPTR(top->mp_page, 0); - MDB_SET_KEY(leaf, &nodekey); - rc = mdb_cmp(cursor->mc_txn, cursor->mc_dbi, key, &nodekey); - if (rc >= 0) { - leaf = NODEPTR(top->mp_page, NUMKEYS(top->mp_page)-1); - MDB_SET_KEY(leaf, &nodekey); - rc = mdb_cmp(cursor->mc_txn, cursor->mc_dbi, key, &nodekey); - if (rc <= 0) { - /* we're already on the right page */ - mpp.mp_page = top->mp_page; - rc = 0; - goto set2; - } - } - } - } - 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); -set2: - 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 (IS_LEAF2(mpp.mp_page)) { - key->mv_size = cursor->mc_txn->mt_dbs[cursor->mc_dbi].md_pad; - key->mv_data = LEAF2KEY(mpp.mp_page, top->mp_ki, key->mv_size); - return MDB_SUCCESS; - } - - 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; - if (op == MDB_GET_BOTH) { - ex2p = &ex2; - } else { - ex2p = NULL; - } - rc = mdb_cursor_set(&cursor->mc_xcursor->mx_cursor, data, NULL, MDB_SET_RANGE, ex2p); - if (rc != MDB_SUCCESS) - return rc; - } - } else if (op == MDB_GET_BOTH || op == MDB_GET_BOTH_RANGE) { - MDB_val d2; - if ((rc = mdb_read_data(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; - } - } - - /* The key already matches in all other cases */ - if (op == MDB_SET_RANGE) - MDB_SET_KEY(leaf, key); - DPRINTF("==> cursor placed on key [%s]", DKEY(key)); - - return rc; -} - -static int -mdb_cursor_first(MDB_cursor *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 (IS_LEAF2(mpp.mp_page)) { - key->mv_size = cursor->mc_txn->mt_dbs[cursor->mc_dbi].md_pad; - key->mv_data = LEAF2KEY(mpp.mp_page, 0, key->mv_size); - return MDB_SUCCESS; - } - - 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 (cursor->mc_xcursor) - cursor->mc_xcursor->mx_cursor.mc_initialized = 0; - if ((rc = mdb_read_data(cursor->mc_txn, leaf, data)) != MDB_SUCCESS) - return rc; - } - } - MDB_SET_KEY(leaf, key); - return MDB_SUCCESS; -} - -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 (IS_LEAF2(mpp.mp_page)) { - key->mv_size = cursor->mc_txn->mt_dbs[cursor->mc_dbi].md_pad; - key->mv_data = LEAF2KEY(mpp.mp_page, top->mp_ki, key->mv_size); - return MDB_SUCCESS; - } - - 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; - } - } - - MDB_SET_KEY(leaf, key); - return MDB_SUCCESS; -} - -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_GET_MULTIPLE: - if (data == NULL || - !(cursor->mc_txn->mt_dbs[cursor->mc_dbi].md_flags & MDB_DUPFIXED) || - !cursor->mc_initialized) { - rc = EINVAL; - break; - } - rc = MDB_SUCCESS; - if (!cursor->mc_xcursor->mx_cursor.mc_initialized || cursor->mc_xcursor->mx_cursor.mc_eof) - break; - goto fetchm; - case MDB_NEXT_MULTIPLE: - if (data == NULL || - !(cursor->mc_txn->mt_dbs[cursor->mc_dbi].md_flags & MDB_DUPFIXED)) { - rc = EINVAL; - break; - } - if (!cursor->mc_initialized) - rc = mdb_cursor_first(cursor, key, data); - else - rc = mdb_cursor_next(cursor, key, data, MDB_NEXT_DUP); - if (rc == MDB_SUCCESS) { - if (cursor->mc_xcursor->mx_cursor.mc_initialized) { - MDB_ppage *top; -fetchm: - top = CURSOR_TOP(&cursor->mc_xcursor->mx_cursor); - data->mv_size = NUMKEYS(top->mp_page) * - cursor->mc_xcursor->mx_txn.mt_dbs[cursor->mc_xcursor->mx_cursor.mc_dbi].md_pad; - data->mv_data = METADATA(top->mp_page); - top->mp_ki = NUMKEYS(top->mp_page)-1; - } else { - rc = MDB_NOTFOUND; - } - } - 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 */ - DKBUF; - - assert(mp->mp_upper >= mp->mp_lower); - - DPRINTF("add node [%s] to %s page %lu at index %i, key size %zu", - key ? DKEY(key) : NULL, - IS_LEAF(mp) ? "leaf" : "branch", - mp->mp_pgno, indx, key ? key->mv_size : 0); - - if (IS_LEAF2(mp)) { - /* Move higher keys up one slot. */ - int ksize = txn->mt_dbs[dbi].md_pad, dif; - char *ptr = LEAF2KEY(mp, indx, ksize); - dif = NUMKEYS(mp) - indx; - if (dif > 0) - memmove(ptr+ksize, ptr, dif*ksize); - /* insert new key */ - memcpy(ptr, key->mv_data, ksize); - - /* Just using these for counting */ - mp->mp_lower += sizeof(indx_t); - mp->mp_upper -= ksize - sizeof(indx_t); - return MDB_SUCCESS; - } - - if (key != NULL) - node_size += key->mv_size; - - if (IS_LEAF(mp)) { - assert(data); - if (F_ISSET(flags, F_BIGDATA)) { - /* Data already on overflow page. */ - node_size += sizeof(pgno_t); - } else if (data->mv_size >= 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 - NODEPGNO(node) = pgno; - - if (key) - memcpy(NODEKEY(node), key->mv_data, key->mv_size); - - if (IS_LEAF(mp)) { - assert(key); - if (ofp == NULL) { - if (F_ISSET(flags, F_BIGDATA)) - memcpy(node->mn_data + key->mv_size, data->mv_data, - sizeof(pgno_t)); - else - memcpy(node->mn_data + key->mv_size, data->mv_data, - data->mv_size); - } else { - memcpy(node->mn_data + key->mv_size, &ofp->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, int ksize) -{ - unsigned int sz; - indx_t i, j, numkeys, ptr; - MDB_node *node; - char *base; - - DPRINTF("delete node %u on %s page %lu", indx, - IS_LEAF(mp) ? "leaf" : "branch", mp->mp_pgno); - assert(indx < NUMKEYS(mp)); - - if (IS_LEAF2(mp)) { - int x = NUMKEYS(mp) - 1 - indx; - base = LEAF2KEY(mp, indx, ksize); - if (x) - memmove(base, base + ksize, x * ksize); - mp->mp_lower -= sizeof(indx_t); - mp->mp_upper += ksize - sizeof(indx_t); - return; - } - - node = NODEPTR(mp, indx); - sz = NODESIZE + node->mn_ksize; - if (IS_LEAF(mp)) { - if (F_ISSET(node->mn_flags, F_BIGDATA)) - sz += sizeof(pgno_t); - else - sz += NODEDSZ(node); - } - - 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; - mx->mx_cursor.mc_initialized = 0; - mx->mx_cursor.mc_eof = 0; -} - -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; - DKBUF; - - node = NODEPTR(mp, indx); - ptr = mp->mp_ptrs[indx]; - DPRINTF("update key %u (ofs %u) [%.*s] to [%s] on page %lu", - indx, ptr, - (int)node->mn_ksize, (char *)NODEKEY(node), - DKEY(key), - mp->mp_pgno); - - delta = key->mv_size - node->mn_ksize; - if (delta) { - if (delta > 0 && SIZELEFT(mp) < delta) { - DPRINTF("OUCH! Not enough room, delta = %d", delta); - return ENOSPC; - } - - numkeys = NUMKEYS(mp); - for (i = 0; i < numkeys; i++) { - if (mp->mp_ptrs[i] <= ptr) - mp->mp_ptrs[i] -= delta; - } - - base = (char *)mp + mp->mp_upper; - len = ptr - mp->mp_upper + NODESIZE; - memmove(base - delta, base, len); - mp->mp_upper -= delta; - - node = NODEPTR(mp, indx); - node->mn_ksize = key->mv_size; - } - - memcpy(NODEKEY(node), key->mv_data, key->mv_size); - - return MDB_SUCCESS; -} - -/* Move a node from 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; - DKBUF; - - /* Mark src and dst as dirty. */ - if ((rc = mdb_touch(txn, src)) || - (rc = mdb_touch(txn, dst))) - return rc;; - - if (IS_LEAF2(src->mp_page)) { - srcnode = NODEPTR(src->mp_page, 0); /* fake */ - key.mv_size = txn->mt_dbs[dbi].md_pad; - key.mv_data = LEAF2KEY(src->mp_page, srcindx, key.mv_size); - data.mv_size = 0; - data.mv_data = NULL; - } else { - srcnode = NODEPTR(src->mp_page, srcindx); - key.mv_size = NODEKSZ(srcnode); - key.mv_data = NODEKEY(srcnode); - data.mv_size = NODEDSZ(srcnode); - data.mv_data = NODEDATA(srcnode); - } - DPRINTF("moving %s node %u [%s] on page %lu to node %u on page %lu", - IS_LEAF(src->mp_page) ? "leaf" : "branch", - srcindx, - DKEY(&key), - src->mp_page->mp_pgno, - dstindx, dst->mp_page->mp_pgno); - - /* Add the node to the destination page. - */ - 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, key.mv_size); - - /* The key value just changed due to del_node, find it again. - */ - if (!IS_LEAF2(src->mp_page)) { - srcnode = NODEPTR(src->mp_page, srcindx); - key.mv_data = NODEKEY(srcnode); - } - - /* Update the parent separators. - */ - if (srcindx == 0) { - if (src->mp_pi != 0) { - DPRINTF("update separator for source page %lu to [%s]", - src->mp_page->mp_pgno, DKEY(&key)); - if ((rc = mdb_update_key(src->mp_parent, src->mp_pi, - &key)) != MDB_SUCCESS) - return rc; - } - if (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) { - if (dst->mp_pi != 0) { - DPRINTF("update separator for destination page %lu to [%s]", - dst->mp_page->mp_pgno, DKEY(&key)); - if ((rc = mdb_update_key(dst->mp_parent, dst->mp_pi, - &key)) != MDB_SUCCESS) - return rc; - } - if (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. - */ - if (IS_LEAF2(src->mp_page)) { - key.mv_size = txn->mt_dbs[dbi].md_pad; - key.mv_data = METADATA(src->mp_page); - for (i = 0; i < NUMKEYS(src->mp_page); i++) { - rc = mdb_add_node(txn, dbi, dst->mp_page, NUMKEYS(dst->mp_page), &key, - NULL, 0, 0); - if (rc != MDB_SUCCESS) - return rc; - key.mv_data = (char *)key.mv_data + key.mv_size; - } - } else { - for (i = 0; i < NUMKEYS(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, 0); - 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 = 0; - txn->mt_dbs[dbi].md_leaf_pages = 0; - } 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 (!IS_LEAF2(mpp->mp_page) && 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; imt_free_pgs, pg); - pg++; - } - } - mdb_del_node(mpp->mp_page, ki, txn->mt_dbs[dbi].md_pad); - 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; - DKBUF; - - assert(key != NULL); - - DPRINTF("====> delete db %u key [%s]", dbi, DKEY(key)); - - if (txn == NULL || !dbi || dbi >= txn->mt_numdbs) - return EINVAL; - - if (F_ISSET(txn->mt_flags, MDB_TXN_RDONLY)) { - return 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 (!IS_LEAF2(mpp.mp_page) && 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; imp_page); i++) { - ni = NODEPTR(top->mp_page, i); - mdb_midl_insert(txn->mt_free_pgs, NODEPGNO(ni)); - } - 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, NODEPGNO(ni)); - } - } - } - 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 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; - DKBUF; - - 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, - DKEY(newkey), *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); - - split_indx = NUMKEYS(&mdp->p) / 2 + 1; - - if (IS_LEAF2(&rdp->p)) { - char *split, *ins; - int x; - unsigned int nkeys = NUMKEYS(&mdp->p), lsize, rsize, ksize; - /* Move half of the keys to the right sibling */ - copy = NULL; - x = *newindxp - split_indx; - ksize = txn->mt_dbs[dbi].md_pad; - split = LEAF2KEY(&mdp->p, split_indx, ksize); - rsize = (nkeys - split_indx) * ksize; - lsize = (nkeys - split_indx) * sizeof(indx_t); - mdp->p.mp_lower -= lsize; - rdp->p.mp_lower += lsize; - mdp->p.mp_upper += rsize - lsize; - rdp->p.mp_upper -= rsize - lsize; - sepkey.mv_size = ksize; - if (newindx == split_indx) { - sepkey.mv_data = newkey->mv_data; - } else { - sepkey.mv_data = split; - } - if (x<0) { - ins = LEAF2KEY(&mdp->p, *newindxp, ksize); - memcpy(&rdp->p.mp_ptrs, split, rsize); - sepkey.mv_data = &rdp->p.mp_ptrs; - memmove(ins+ksize, ins, (split_indx - *newindxp) * ksize); - memcpy(ins, newkey->mv_data, ksize); - mdp->p.mp_lower += sizeof(indx_t); - mdp->p.mp_upper -= ksize - sizeof(indx_t); - } else { - if (x) - memcpy(&rdp->p.mp_ptrs, split, x * ksize); - ins = LEAF2KEY(&rdp->p, x, ksize); - memcpy(ins, newkey->mv_data, ksize); - memcpy(ins+ksize, split + x * ksize, rsize - x * ksize); - rdp->p.mp_lower += sizeof(indx_t); - rdp->p.mp_upper -= ksize - sizeof(indx_t); - *newindxp = x; - *mpp = &rdp->p; - } - goto newsep; - } - - /* 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; - - /* 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); - } - -newsep: - DPRINTF("separator is [%s]", DKEY(&sepkey)); - - /* 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 (IS_LEAF2(&rdp->p)) { - return rc; - } - 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 = NODEPGNO(node); - 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; - size_t nsize; - DKBUF; - - DPRINTF("==> put db %u key [%s], size %zu, data size %zu", - dbi, DKEY(key), 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]", DKEY(key)); - return MDB_KEYEXIST; - } - /* there's only a key anyway, so this is a no-op */ - if (IS_LEAF2(mpp.mp_page)) - return MDB_SUCCESS; - - 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); - dkey.mv_data = dbuf; - memcpy(dbuf, NODEDATA(leaf), dkey.mv_size); - /* data matches, ignore it */ - if (!mdb_dcmp(txn, dbi, data, &dkey)) - return (flags == MDB_NODUPDATA) ? MDB_KEYEXIST : MDB_SUCCESS; - memset(&dummy, 0, sizeof(dummy)); - if (txn->mt_dbs[dbi].md_flags & MDB_DUPFIXED) { - dummy.md_pad = data->mv_size; - dummy.md_flags = MDB_DUPFIXED; - if (txn->mt_dbs[dbi].md_flags & MDB_INTEGERDUP) - dummy.md_flags |= MDB_INTEGERKEY; - } - dummy.md_root = P_INVALID; - if (dkey.mv_size == sizeof(MDB_db)) { - memcpy(NODEDATA(leaf), &dummy, sizeof(dummy)); - goto put_sub; - } - mdb_del_node(mpp.mp_page, ki, 0); - 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, 0); - } - 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; - if ((txn->mt_dbs[dbi].md_flags & (MDB_DUPSORT|MDB_DUPFIXED)) == MDB_DUPFIXED) - mpp.mp_page->mp_flags |= P_LEAF2; - 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: - nsize = IS_LEAF2(mpp.mp_page) ? key->mv_size : mdb_leaf_size(txn->mt_env, key, rdata); - if (SIZELEFT(mpp.mp_page) < nsize) { - 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) { - 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; imt_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; -}