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More sub-db stuff

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This commit is contained in:
Howard Chu 2011-08-07 22:37:45 -07:00
parent a687f2dc3c
commit 852ac0e3bc
2 changed files with 223 additions and 203 deletions
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417
libraries/libmdb/mdb.c
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@ -33,7 +33,7 @@ typedef ULONG pgno_t;
#define DEBUG 1
#endif
#if (DEBUG +0) && defined(__GNUC__)
#if DEBUG && defined(__GNUC__)
# define DPRINTF(fmt, ...) \
fprintf(stderr, "%s:%d: " fmt "\n", __func__, __LINE__, ##__VA_ARGS__)
#else
@ -97,7 +97,11 @@ typedef struct MDB_txninfo {
* headers on any page after the first.
*/
typedef struct MDB_page { /* represents a page of storage */
pgno_t mp_pgno; /* page number */
#define mp_pgno mp_p.p_pgno
union padded {
pgno_t p_pgno; /* page number */
void * p_pad;
} mp_p;
#define P_BRANCH 0x01 /* branch page */
#define P_LEAF 0x02 /* leaf page */
#define P_OVERFLOW 0x04 /* overflow page */
@ -121,29 +125,38 @@ typedef struct MDB_page { /* represents a page of storage */
#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_meta.mm_psize - PAGEHDRSZ - SIZELEFT(p)) / \
((env)->me_meta.mm_psize - PAGEHDRSZ))
#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_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 + size + psize - 1) / psize;
typedef struct MDB_db {
uint32_t md_pad;
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 */
uint32_t mm_psize;
uint16_t mm_flags;
uint16_t mm_depth;
ULONG mm_branch_pages;
ULONG mm_leaf_pages;
ULONG mm_overflow_pages;
ULONG mm_entries;
pgno_t mm_root;
} MDB_meta;
typedef struct MDB_dhead { /* a dirty page */
@ -211,24 +224,12 @@ typedef struct MDB_node {
char mn_data[1];
} MDB_node;
typedef struct MDB_db {
uint32_t md_pad;
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;
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_db *md_db;
MDB_page *md_page;
} MDB_dbx;
struct MDB_txn {
@ -242,7 +243,7 @@ struct MDB_txn {
MDB_reader *reader;
} mt_u;
MDB_dbx *mt_dbxs; /* array */
MDB_db mt_db0; /* just for write txns */
MDB_db *mt_dbs;
unsigned int mt_numdbs;
#define MDB_TXN_RDONLY 0x01 /* read-only transaction */
@ -255,19 +256,24 @@ struct MDB_env {
int me_fd;
int me_lfd;
uint32_t me_flags;
unsigned int me_maxreaders;
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_meta;
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 */
pthread_key_t me_txkey; /* thread-key for readers */
unsigned int me_psize;
int me_db_toggle;
MDB_dbx *me_dbxs; /* array */
MDB_db *me_dbs[2];
MDB_oldpages *me_pghead;
MDB_oldpages *me_pgtail;
MDB_dbx *me_dbxs; /* array */
unsigned int me_numdbs;
pthread_key_t me_txkey; /* thread-key for readers */
};
#define NODESIZE offsetof(MDB_node, mn_data)
@ -292,8 +298,7 @@ static int mdb_search_page(MDB_txn *txn,
MDB_cursor *cursor, int modify,
MDB_pageparent *mpp);
static int mdbenv_read_header(MDB_env *env);
static int mdb_check_meta_page(MDB_page *p);
static int mdbenv_read_header(MDB_env *env, MDB_meta *meta);
static int mdbenv_read_meta(MDB_env *env, int *which);
static int mdbenv_write_meta(MDB_txn *txn);
static MDB_page *mdbenv_get_page(MDB_env *env, pgno_t pgno);
@ -384,7 +389,7 @@ mdb_cmp(MDB_txn *txn, MDB_dbi dbi, const MDB_val *a, const MDB_val *b)
static int
_mdb_cmp(MDB_txn *txn, MDB_dbi dbi, const MDB_val *key1, const MDB_val *key2)
{
if (F_ISSET(txn->mt_dbxs[dbi].md_db->md_flags, MDB_REVERSEKEY))
if (F_ISSET(txn->mt_dbs[dbi].md_flags, MDB_REVERSEKEY))
return memnrcmp(key1->mv_data, key1->mv_size, key2->mv_data, key2->mv_size);
else
return memncmp((char *)key1->mv_data, key1->mv_size, key2->mv_data, key2->mv_size);
@ -435,7 +440,7 @@ mdb_alloc_page(MDB_txn *txn, MDB_page *parent, unsigned int parent_idx, int num)
}
}
if ((dp = malloc(txn->mt_env->me_meta.mm_psize * num + sizeof(MDB_dhead))) == NULL)
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;
@ -468,7 +473,7 @@ mdb_touch(MDB_txn *txn, MDB_pageparent *pp)
DPRINTF("touched page %lu -> %lu", mp->mp_pgno, dp->p.mp_pgno);
mdb_idl_insert(txn->mt_free_pgs, mp->mp_pgno);
pgno = dp->p.mp_pgno;
memcpy(&dp->p, mp, txn->mt_env->me_meta.mm_psize);
memcpy(&dp->p, mp, txn->mt_env->me_psize);
mp = &dp->p;
mp->mp_pgno = pgno;
mp->mp_flags |= P_DIRTY;
@ -492,8 +497,6 @@ mdbenv_sync(MDB_env *env)
return rc;
}
#define DBX_CHUNK 16 /* space for 16 DBs at a time */
int
mdb_txn_begin(MDB_env *env, int rdonly, MDB_txn **ret)
{
@ -563,20 +566,21 @@ mdb_txn_begin(MDB_env *env, int rdonly, MDB_txn **ret)
/* Copy the DB arrays */
txn->mt_numdbs = env->me_numdbs;
rc = (txn->mt_numdbs % DBX_CHUNK) + 1;
txn->mt_dbxs = malloc(rc * DBX_CHUNK * sizeof(MDB_dbx));
memcpy(txn->mt_dbxs, env->me_dbxs, txn->mt_numdbs * sizeof(MDB_dbx));
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) {
memcpy(&txn->mt_db0, txn->mt_dbxs[0].md_db, sizeof(txn->mt_db0));
txn->mt_dbxs[0].md_db = &txn->mt_db0;
if (toggle)
txn->mt_flags |= MDB_TXN_METOGGLE;
txn->mt_next_pgno = env->me_meta.mm_last_pg+1;
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_dbxs[0].md_db->md_root);
txn->mt_txnid, (void *) env, txn->mt_dbs[MAIN_DBI].md_root);
*ret = txn;
return MDB_SUCCESS;
@ -593,9 +597,9 @@ mdb_txn_abort(MDB_txn *txn)
env = txn->mt_env;
DPRINTF("abort transaction %lu on mdbenv %p, root page %lu",
txn->mt_txnid, (void *) env, txn->mt_dbxs[0].md_db->md_root);
txn->mt_txnid, (void *) env, txn->mt_dbs[MAIN_DBI].md_root);
free(txn->mt_dbxs);
free(txn->mt_dbs);
if (F_ISSET(txn->mt_flags, MDB_TXN_RDONLY)) {
txn->mt_u.reader->mr_txnid = 0;
@ -607,7 +611,7 @@ mdb_txn_abort(MDB_txn *txn)
while (!STAILQ_EMPTY(txn->mt_u.dirty_queue)) {
dp = STAILQ_FIRST(txn->mt_u.dirty_queue);
STAILQ_REMOVE_HEAD(txn->mt_u.dirty_queue, h.md_next);
if (dp->p.mp_pgno <= env->me_meta.mm_last_pg)
if (dp->p.mp_pgno <= env->me_meta->mm_last_pg)
mdb_idl_insert(txn->mt_free_pgs, dp->p.mp_pgno);
free(dp);
}
@ -639,6 +643,7 @@ int
mdb_txn_commit(MDB_txn *txn)
{
int n, done;
unsigned int i;
ssize_t rc;
off_t size;
MDB_dpage *dp;
@ -673,7 +678,26 @@ mdb_txn_commit(MDB_txn *txn)
goto done;
DPRINTF("committing transaction %lu on mdbenv %p, root page %lu",
txn->mt_txnid, (void *) env, txn->mt_dbxs[0].md_db->md_root);
txn->mt_txnid, (void *) env, txn->mt_dbs[MAIN_DBI].md_root);
/* 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 < env->me_numdbs; i++) {
if (env->me_dbs[env->me_db_toggle][i].md_root != txn->mt_dbs[i].md_root) {
data.mv_data = &txn->mt_dbs[i];
mdb_put(txn, i, &txn->mt_dbxs[i].md_name, &data, 0);
}
}
for (i = env->me_numdbs; i < txn->mt_numdbs; i++) {
data.mv_data = &txn->mt_dbs[i];
mdb_put(txn, i, &txn->mt_dbxs[i].md_name, &data, 0);
}
}
/* Commit up to MDB_COMMIT_PAGES dirty pages to disk until done.
*/
@ -699,11 +723,11 @@ mdb_txn_commit(MDB_txn *txn)
n = 0;
size = 0;
}
lseek(env->me_fd, dp->p.mp_pgno * env->me_meta.mm_psize, SEEK_SET);
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_meta.mm_psize * dp->h.md_num;
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;
@ -748,14 +772,22 @@ mdb_txn_commit(MDB_txn *txn)
}
env->me_txn = NULL;
/* update the DB tables */
{
MDB_dbx *p1 = env->me_dbxs;
int toggle = !env->me_db_toggle;
txn->mt_dbxs[0].md_db = env->me_dbxs[0].md_db;
env->me_dbxs = txn->mt_dbxs;
for (i = 0; i < env->me_numdbs; i++) {
if (env->me_dbs[toggle][i].md_root != txn->mt_dbs[i].md_root)
env->me_dbs[toggle][i] = txn->mt_dbs[i];
}
for (i = env->me_numdbs; i < txn->mt_numdbs; i++) {
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(p1);
free(txn->mt_dbs);
}
/* add to tail of free list */
@ -787,7 +819,7 @@ done:
}
static int
mdbenv_read_header(MDB_env *env)
mdbenv_read_header(MDB_env *env, MDB_meta *meta)
{
char page[PAGESIZE];
MDB_page *p;
@ -827,42 +859,43 @@ mdbenv_read_header(MDB_env *env)
return EINVAL;
}
memcpy(&env->me_meta, m, sizeof(*m));
memcpy(meta, m, sizeof(*m));
return 0;
}
static int
mdbenv_init_meta(MDB_env *env)
mdbenv_init_meta(MDB_env *env, MDB_meta *meta)
{
MDB_page *p, *q;
MDB_meta *meta;
MDB_meta *m;
int rc;
unsigned int psize;
DPRINTF("writing new meta page");
psize = sysconf(_SC_PAGE_SIZE);
env->me_meta.mm_magic = MDB_MAGIC;
env->me_meta.mm_version = MDB_VERSION;
env->me_meta.mm_psize = psize;
env->me_meta.mm_flags = env->me_flags & 0xffff;
env->me_meta.mm_root = P_INVALID;
env->me_meta.mm_last_pg = 1;
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_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;
meta = METADATA(p);
memcpy(meta, &env->me_meta, sizeof(*meta));
m = METADATA(p);
memcpy(m, meta, sizeof(*meta));
q = (MDB_page *)((char *)p + psize);
q->mp_pgno = 1;
q->mp_flags = P_META;
meta = METADATA(q);
memcpy(meta, &env->me_meta, sizeof(*meta));
m = METADATA(q);
memcpy(m, meta, sizeof(*meta));
rc = write(env->me_fd, p, psize * 2);
free(p);
@ -881,28 +914,22 @@ mdbenv_write_meta(MDB_txn *txn)
assert(txn != NULL);
assert(txn->mt_env != NULL);
DPRINTF("writing meta page for root page %lu", txn->mt_dbxs[0].md_db->md_root);
DPRINTF("writing meta page for root page %lu", txn->mt_dbs[MAIN_DBI].md_root);
env = txn->mt_env;
ptr = (char *)&meta;
off = offsetof(MDB_meta, mm_last_pg);
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;
meta.mm_psize = env->me_meta.mm_psize;
meta.mm_flags = env->me_meta.mm_flags;
meta.mm_depth = txn->mt_dbxs[0].md_db->md_depth;
meta.mm_branch_pages = txn->mt_dbxs[0].md_db->md_branch_pages;
meta.mm_leaf_pages = txn->mt_dbxs[0].md_db->md_leaf_pages;
meta.mm_overflow_pages = txn->mt_dbxs[0].md_db->md_overflow_pages;
meta.mm_entries = txn->mt_dbxs[0].md_db->md_entries;
meta.mm_root = txn->mt_dbxs[0].md_db->md_root;
if (!F_ISSET(txn->mt_flags, MDB_TXN_METOGGLE))
off += env->me_meta.mm_psize;
off += env->me_psize;
off += PAGEHDRSZ;
lseek(env->me_fd, off, SEEK_SET);
@ -915,49 +942,20 @@ mdbenv_write_meta(MDB_txn *txn)
return MDB_SUCCESS;
}
/* Returns true if page p is a valid meta page, false otherwise.
*/
static int
mdb_check_meta_page(MDB_page *p)
{
if (!F_ISSET(p->mp_flags, P_META)) {
DPRINTF("page %lu not a meta page", p->mp_pgno);
return EINVAL;
}
return 0;
}
static int
mdbenv_read_meta(MDB_env *env, int *which)
{
MDB_page *mp0, *mp1;
MDB_meta *meta[2];
int toggle = 0, rc;
int toggle = 0;
assert(env != NULL);
if ((mp0 = mdbenv_get_page(env, 0)) == NULL ||
(mp1 = mdbenv_get_page(env, 1)) == NULL)
return EIO;
rc = mdb_check_meta_page(mp0);
if (rc) return rc;
rc = mdb_check_meta_page(mp1);
if (rc) return rc;
meta[0] = METADATA(mp0);
meta[1] = METADATA(mp1);
if (meta[0]->mm_txnid < meta[1]->mm_txnid)
if (env->me_metas[0]->mm_txnid < env->me_metas[1]->mm_txnid)
toggle = 1;
if (meta[toggle]->mm_txnid > env->me_meta.mm_txnid) {
memcpy(&env->me_meta, meta[toggle], sizeof(env->me_meta));
if (which)
*which = toggle;
}
if (env->me_meta != env->me_metas[toggle])
env->me_meta = env->me_metas[toggle];
if (which)
*which = toggle;
DPRINTF("Using meta page %d", toggle);
@ -972,8 +970,8 @@ mdbenv_create(MDB_env **env)
e = calloc(1, sizeof(*e));
if (!e) return ENOMEM;
e->me_meta.mm_mapsize = DEFAULT_MAPSIZE;
e->me_maxreaders = DEFAULT_READERS;
e->me_maxdbs = 2;
e->me_fd = -1;
e->me_lfd = -1;
*env = e;
@ -985,7 +983,16 @@ mdbenv_set_mapsize(MDB_env *env, size_t size)
{
if (env->me_map)
return EINVAL;
env->me_mapsize = env->me_meta.mm_mapsize = size;
env->me_mapsize = size;
return MDB_SUCCESS;
}
int
mdbenv_set_maxdbs(MDB_env *env, int dbs)
{
if (env->me_map)
return EINVAL;
env->me_maxdbs = dbs;
return MDB_SUCCESS;
}
@ -1009,49 +1016,59 @@ int
mdbenv_open2(MDB_env *env, unsigned int flags)
{
int i, newenv = 0;
MDB_meta meta;
MDB_page *p;
env->me_flags = flags;
if ((i = mdbenv_read_header(env)) != 0) {
memset(&meta, 0, sizeof(meta));
if ((i = mdbenv_read_header(env, &meta)) != 0) {
if (i != ENOENT)
return i;
DPRINTF("new mdbenv");
newenv = 1;
}
if (!env->me_mapsize)
env->me_mapsize = env->me_meta.mm_mapsize;
if (!env->me_mapsize) {
env->me_mapsize = newenv ? DEFAULT_MAPSIZE : meta.mm_mapsize;
}
i = MAP_SHARED;
if (env->me_meta.mm_address && (flags & MDB_FIXEDMAP))
if (meta.mm_address && (flags & MDB_FIXEDMAP))
i |= MAP_FIXED;
env->me_map = mmap(env->me_meta.mm_address, env->me_mapsize, PROT_READ, i,
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) {
env->me_meta.mm_mapsize = env->me_mapsize;
meta.mm_mapsize = env->me_mapsize;
if (flags & MDB_FIXEDMAP)
env->me_meta.mm_address = env->me_map;
i = mdbenv_init_meta(env);
meta.mm_address = env->me_map;
i = mdbenv_init_meta(env, &meta);
if (i != MDB_SUCCESS) {
munmap(env->me_map, env->me_mapsize);
return i;
}
}
env->me_psize = meta.mm_psize;
p = (MDB_page *)(MDB_page *)(MDB_page *)(MDB_page *)(MDB_page *)(MDB_page *)(MDB_page *)(MDB_page *)(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 = mdbenv_read_meta(env, NULL)) != 0)
return i;
DPRINTF("opened database version %u, pagesize %u",
env->me_meta.mm_version, env->me_meta.mm_psize);
DPRINTF("depth: %u", env->me_meta.mm_depth);
DPRINTF("entries: %lu", env->me_meta.mm_entries);
DPRINTF("branch pages: %lu", env->me_meta.mm_branch_pages);
DPRINTF("leaf pages: %lu", env->me_meta.mm_leaf_pages);
DPRINTF("overflow pages: %lu", env->me_meta.mm_overflow_pages);
DPRINTF("root: %lu", env->me_meta.mm_root);
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;
}
@ -1066,12 +1083,13 @@ mdbenv_reader_dest(void *ptr)
reader->mr_tid = 0;
}
/* downgrade the exclusive lock on the region back to shared */
static void
mdbenv_share_locks(MDB_env *env)
{
struct flock lock_info;
env->me_txns->mt_txnid = env->me_meta.mm_txnid;
env->me_txns->mt_txnid = env->me_meta->mm_txnid;
memset((void *)&lock_info, 0, sizeof(lock_info));
lock_info.l_type = F_RDLCK;
@ -1201,12 +1219,12 @@ mdbenv_open(MDB_env *env, const char *path, unsigned int flags, mode_t mode)
pthread_key_create(&env->me_txkey, mdbenv_reader_dest);
if (excl)
mdbenv_share_locks(env);
env->me_dbxs = calloc(DBX_CHUNK, sizeof(MDB_dbx));
env->me_numdbs = 1;
env->me_dbxs[0].md_db = (MDB_db *)&env->me_meta.mm_psize;
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:
free(lpath);
return rc;
@ -1348,7 +1366,7 @@ mdbenv_get_page(MDB_env *env, pgno_t pgno)
}
}
if (!found) {
p = (MDB_page *)(env->me_map + env->me_meta.mm_psize * pgno);
p = (MDB_page *)(env->me_map + env->me_psize * pgno);
}
return p;
}
@ -1450,7 +1468,7 @@ mdb_search_page(MDB_txn *txn, MDB_dbi dbi, MDB_val *key,
DPRINTF("transaction has failed, must abort");
return EINVAL;
} else
root = txn->mt_dbxs[dbi].md_db->md_root;
root = txn->mt_dbs[dbi].md_root;
if (root == P_INVALID) { /* Tree is empty. */
DPRINTF("tree is empty");
@ -1464,7 +1482,8 @@ mdb_search_page(MDB_txn *txn, MDB_dbi dbi, MDB_val *key,
if (modify) {
/* For sub-databases, update main root first */
if (dbi && !F_ISSET(txn->mt_dbxs[dbi].md_page->mp_flags, P_DIRTY)) {
if (dbi > MAIN_DBI && txn->mt_dbs[dbi].md_root ==
txn->mt_env->me_dbs[txn->mt_env->me_db_toggle][dbi].md_root) {
MDB_pageparent mp2;
rc = mdb_search_page(txn, 0, &txn->mt_dbxs[dbi].md_name,
NULL, 1, &mp2);
@ -1476,7 +1495,7 @@ mdb_search_page(MDB_txn *txn, MDB_dbi dbi, MDB_val *key,
mpp->mp_pi = 0;
if ((rc = mdb_touch(txn, mpp)))
return rc;
txn->mt_dbxs[dbi].md_db->md_root = mpp->mp_page->mp_pgno;
txn->mt_dbs[dbi].md_root = mpp->mp_page->mp_pgno;
}
}
@ -1794,17 +1813,17 @@ mdb_new_page(MDB_txn *txn, MDB_dbi dbi, uint32_t flags, int num)
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_meta.mm_psize);
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_meta.mm_psize;
dp->p.mp_upper = txn->mt_env->me_psize;
if (IS_BRANCH(&dp->p))
txn->mt_dbxs[dbi].md_db->md_branch_pages++;
txn->mt_dbs[dbi].md_branch_pages++;
else if (IS_LEAF(&dp->p))
txn->mt_dbxs[dbi].md_db->md_leaf_pages++;
txn->mt_dbs[dbi].md_leaf_pages++;
else if (IS_OVERFLOW(&dp->p)) {
txn->mt_dbxs[dbi].md_db->md_overflow_pages += num;
txn->mt_dbs[dbi].md_overflow_pages += num;
dp->p.mp_pages = num;
}
@ -1817,7 +1836,7 @@ 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_meta.mm_psize / MDB_MINKEYS) {
if (data->mv_size >= env->me_psize / MDB_MINKEYS) {
/* put on overflow page */
sz -= data->mv_size - sizeof(pgno_t);
}
@ -1831,7 +1850,7 @@ mdb_branch_size(MDB_env *env, MDB_val *key)
size_t sz;
sz = INDXSIZE(key);
if (sz >= env->me_meta.mm_psize / MDB_MINKEYS) {
if (sz >= env->me_psize / MDB_MINKEYS) {
/* put on overflow page */
/* not implemented */
/* sz -= key->size - sizeof(pgno_t); */
@ -1865,8 +1884,8 @@ mdb_add_node(MDB_txn *txn, MDB_dbi dbi, MDB_page *mp, indx_t indx,
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_meta.mm_psize / MDB_MINKEYS) {
int ovpages = OVPAGES(data->mv_size, txn->mt_env->me_meta.mm_psize);
} 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);
@ -2165,9 +2184,9 @@ mdb_merge(MDB_txn *txn, MDB_dbi dbi, MDB_pageparent *src, MDB_pageparent *dst)
}
if (IS_LEAF(src->mp_page))
txn->mt_dbxs[dbi].md_db->md_leaf_pages--;
txn->mt_dbs[dbi].md_leaf_pages--;
else
txn->mt_dbxs[dbi].md_db->md_branch_pages--;
txn->mt_dbs[dbi].md_branch_pages--;
mpp.mp_page = src->mp_parent;
dh = (MDB_dhead *)src->mp_parent;
@ -2204,16 +2223,16 @@ mdb_rebalance(MDB_txn *txn, MDB_dbi dbi, MDB_pageparent *mpp)
if (mpp->mp_parent == NULL) {
if (NUMKEYS(mpp->mp_page) == 0) {
DPRINTF("tree is completely empty");
txn->mt_dbxs[dbi].md_db->md_root = P_INVALID;
txn->mt_dbxs[dbi].md_db->md_depth--;
txn->mt_dbxs[dbi].md_db->md_leaf_pages--;
txn->mt_dbs[dbi].md_root = P_INVALID;
txn->mt_dbs[dbi].md_depth--;
txn->mt_dbs[dbi].md_leaf_pages--;
} else if (IS_BRANCH(mpp->mp_page) && NUMKEYS(mpp->mp_page) == 1) {
DPRINTF("collapsing root page!");
txn->mt_dbxs[dbi].md_db->md_root = NODEPGNO(NODEPTR(mpp->mp_page, 0));
if ((root = mdbenv_get_page(txn->mt_env, txn->mt_dbxs[dbi].md_db->md_root)) == NULL)
txn->mt_dbs[dbi].md_root = NODEPGNO(NODEPTR(mpp->mp_page, 0));
if ((root = mdbenv_get_page(txn->mt_env, txn->mt_dbs[dbi].md_root)) == NULL)
return MDB_FAIL;
txn->mt_dbxs[dbi].md_db->md_depth--;
txn->mt_dbxs[dbi].md_db->md_branch_pages--;
txn->mt_dbs[dbi].md_depth--;
txn->mt_dbs[dbi].md_branch_pages--;
} else
DPRINTF("root page doesn't need rebalancing");
return MDB_SUCCESS;
@ -2314,13 +2333,13 @@ mdb_del(MDB_txn *txn, MDB_dbi dbi,
pgno_t pg;
memcpy(&pg, NODEDATA(leaf), sizeof(pg));
ovpages = OVPAGES(NODEDSZ(leaf), txn->mt_env->me_meta.mm_psize);
ovpages = OVPAGES(NODEDSZ(leaf), txn->mt_env->me_psize);
for (i=0; i<ovpages; i++) {
mdb_idl_insert(txn->mt_free_pgs, pg);
pg++;
}
}
txn->mt_dbxs[dbi].md_db->md_entries--;
txn->mt_dbs[dbi].md_entries--;
rc = mdb_rebalance(txn, dbi, &mpp);
if (rc != MDB_SUCCESS)
txn->mt_flags |= MDB_TXN_ERROR;
@ -2363,9 +2382,9 @@ mdb_split(MDB_txn *txn, MDB_dbi dbi, MDB_page **mpp, unsigned int *newindxp,
return MDB_FAIL;
mdp->h.md_pi = 0;
mdp->h.md_parent = &pdp->p;
txn->mt_dbxs[dbi].md_db->md_root = pdp->p.mp_pgno;
txn->mt_dbs[dbi].md_root = pdp->p.mp_pgno;
DPRINTF("root split! new root = %lu", pdp->p.mp_pgno);
txn->mt_dbxs[dbi].md_db->md_depth++;
txn->mt_dbs[dbi].md_depth++;
/* Add left (implicit) pointer. */
if (mdb_add_node(txn, dbi, &pdp->p, 0, NULL, NULL,
@ -2383,12 +2402,12 @@ mdb_split(MDB_txn *txn, MDB_dbi dbi, MDB_page **mpp, unsigned int *newindxp,
DPRINTF("new right sibling: page %lu", rdp->p.mp_pgno);
/* Move half of the keys to the right sibling. */
if ((copy = malloc(txn->mt_env->me_meta.mm_psize)) == NULL)
if ((copy = malloc(txn->mt_env->me_psize)) == NULL)
return MDB_FAIL;
memcpy(copy, &mdp->p, txn->mt_env->me_meta.mm_psize);
memset(&mdp->p.mp_ptrs, 0, txn->mt_env->me_meta.mm_psize - PAGEHDRSZ);
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_meta.mm_psize;
mdp->p.mp_upper = txn->mt_env->me_psize;
split_indx = NUMKEYS(copy) / 2 + 1;
@ -2524,6 +2543,11 @@ mdb_put(MDB_txn *txn, MDB_dbi dbi,
(int)key->mv_size, (char *)key->mv_data);
return EEXIST;
}
/* same size, just replace it */
if (NODEDSZ(leaf) == data->mv_size) {
memcpy(NODEDATA(leaf), data->mv_data, data->mv_size);
goto done;
}
mdb_del_node(mpp.mp_page, ki);
}
if (leaf == NULL) { /* append if not found */
@ -2538,8 +2562,8 @@ mdb_put(MDB_txn *txn, MDB_dbi dbi,
return ENOMEM;
}
mpp.mp_page = &dp->p;
txn->mt_dbxs[dbi].md_db->md_root = mpp.mp_page->mp_pgno;
txn->mt_dbxs[dbi].md_db->md_depth++;
txn->mt_dbs[dbi].md_root = mpp.mp_page->mp_pgno;
txn->mt_dbs[dbi].md_depth++;
ki = 0;
}
else
@ -2559,7 +2583,7 @@ mdb_put(MDB_txn *txn, MDB_dbi dbi,
if (rc != MDB_SUCCESS)
txn->mt_flags |= MDB_TXN_ERROR;
else
txn->mt_dbxs[dbi].md_db->md_entries++;
txn->mt_dbs[dbi].md_entries++;
done:
return rc;
@ -2591,12 +2615,12 @@ mdbenv_stat(MDB_env *env, MDB_stat *arg)
if (env == NULL || arg == NULL)
return EINVAL;
arg->ms_psize = env->me_meta.mm_psize;
arg->ms_depth = env->me_meta.mm_depth;
arg->ms_branch_pages = env->me_meta.mm_branch_pages;
arg->ms_leaf_pages = env->me_meta.mm_leaf_pages;
arg->ms_overflow_pages = env->me_meta.mm_overflow_pages;
arg->ms_entries = env->me_meta.mm_entries;
arg->ms_psize = env->me_psize;
arg->ms_depth = env->me_meta->mm_dbs[MAIN_DBI].md_depth;
arg->ms_branch_pages = env->me_meta->mm_dbs[MAIN_DBI].md_branch_pages;
arg->ms_leaf_pages = env->me_meta->mm_dbs[MAIN_DBI].md_leaf_pages;
arg->ms_overflow_pages = env->me_meta->mm_dbs[MAIN_DBI].md_overflow_pages;
arg->ms_entries = env->me_meta->mm_dbs[MAIN_DBI].md_entries;
return MDB_SUCCESS;
}
@ -2610,24 +2634,27 @@ int mdb_open(MDB_txn *txn, const char *name, unsigned int flags, MDB_dbi *dbi)
/* main DB? */
if (!name) {
*dbi = 0;
*dbi = MAIN_DBI;
return MDB_SUCCESS;
}
/* Is the DB already open? */
len = strlen(name);
for (i=0; i<txn->mt_numdbs; i++) {
for (i=2; i<txn->mt_numdbs; i++) {
if (len == txn->mt_dbxs[i].md_name.mv_size &&
!strcmp(name, txn->mt_dbxs[i].md_name.mv_data)) {
!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, 0, &key, &data);
rc = mdb_get(txn, MAIN_DBI, &key, &data);
/* Create if requested */
if (rc == ENOENT && (flags & MDB_CREATE)) {
@ -2638,28 +2665,16 @@ int mdb_open(MDB_txn *txn, const char *name, unsigned int flags, MDB_dbi *dbi)
dummy.md_root = P_INVALID;
dummy.md_flags = flags & 0xffff;
rc = mdb_put(txn, 0, &key, &data, 0);
if (rc == MDB_SUCCESS)
rc = mdb_get(txn, 0, &key, &data);
}
/* OK, got info, add to table */
if (rc == MDB_SUCCESS) {
/* Is there a free slot? */
if ((txn->mt_numdbs & (DBX_CHUNK-1)) == 0) {
MDB_dbx *p1;
int i;
i = txn->mt_numdbs + DBX_CHUNK;
p1 = realloc(txn->mt_dbxs, i * sizeof(MDB_dbx));
if (p1 == NULL)
return ENOMEM;
txn->mt_dbxs = p1;
}
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_db = data.mv_data;
memcpy(&txn->mt_dbs[txn->mt_numdbs], data.mv_data, sizeof(MDB_db));
*dbi = txn->mt_numdbs;
txn->mt_numdbs++;
}
@ -2672,21 +2687,23 @@ int mdb_stat(MDB_txn *txn, MDB_dbi dbi, MDB_stat *arg)
if (txn == NULL || arg == NULL)
return EINVAL;
arg->ms_psize = txn->mt_env->me_meta.mm_psize;
arg->ms_depth = txn->mt_dbxs[dbi].md_db->md_depth;
arg->ms_branch_pages = txn->mt_dbxs[dbi].md_db->md_branch_pages;
arg->ms_leaf_pages = txn->mt_dbxs[dbi].md_db->md_leaf_pages;
arg->ms_overflow_pages = txn->mt_dbxs[dbi].md_db->md_overflow_pages;
arg->ms_entries = txn->mt_dbxs[dbi].md_db->md_entries;
arg->ms_psize = txn->mt_env->me_psize;
arg->ms_depth = txn->mt_dbs[dbi].md_depth;
arg->ms_branch_pages = txn->mt_dbs[dbi].md_branch_pages;
arg->ms_leaf_pages = txn->mt_dbs[dbi].md_leaf_pages;
arg->ms_overflow_pages = txn->mt_dbs[dbi].md_overflow_pages;
arg->ms_entries = txn->mt_dbs[dbi].md_entries;
return MDB_SUCCESS;
}
void mdb_close(MDB_txn *txn, MDB_dbi dbi)
{
if (dbi >= txn->mt_numdbs)
char *ptr;
if (dbi <= MAIN_DBI || dbi >= txn->mt_numdbs)
return;
free(txn->mt_dbxs[dbi].md_name.mv_data);
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);
}

9
libraries/libmdb/mdb.h
View file

@ -39,12 +39,14 @@ typedef enum MDB_cursor_op { /* cursor operations */
/* DB flags */
#define MDB_REVERSEKEY 0x02 /* use reverse string keys */
#define MDB_DUPSORT 0x04 /* use sorted duplicates */
#define MDB_NOSYNC 0x10000 /* don't fsync after commit */
#define MDB_RDONLY 0x20000 /* read only */
#define MDB_CREATE 0x40000 /* create if not present */
/* environment flags */
#define MDB_FIXEDMAP 0x01 /* mmap at a fixed address */
#define MDB_NOSYNC 0x10000 /* don't fsync after commit */
#define MDB_RDONLY 0x20000 /* read only */
/* DB or env flags */
#define MDB_CREATE 0x40000 /* create if not present */
typedef struct MDB_stat {
unsigned int ms_psize;
@ -64,6 +66,7 @@ int mdbenv_get_path(MDB_env *env, const char **path);
int mdbenv_set_mapsize(MDB_env *env, size_t size);
int mdbenv_set_maxreaders(MDB_env *env, int readers);
int mdbenv_get_maxreaders(MDB_env *env, int *readers);
int mdbenv_set_maxdbs(MDB_env *env, int dbs);
int mdbenv_sync(MDB_env *env);
int mdb_txn_begin(MDB_env *env, int rdonly, MDB_txn **txn);