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Add MDB_WRITEMAP to use a writable mmap

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This commit is contained in:
Howard Chu 2012-09-04 10:28:37 -07:00
parent 14a08f877f
commit d8a89464cd
4 changed files with 100 additions and 29 deletions
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108
libraries/libmdb/mdb.c
View file

@ -1312,26 +1312,39 @@ none:
return NULL;
}
}
if (txn->mt_env->me_dpages && num == 1) {
np = txn->mt_env->me_dpages;
VGMEMP_ALLOC(txn->mt_env, np, txn->mt_env->me_psize);
VGMEMP_DEFINED(np, sizeof(np->mp_next));
txn->mt_env->me_dpages = np->mp_next;
} else {
size_t sz = txn->mt_env->me_psize * num;
if ((np = malloc(sz)) == NULL)
return NULL;
VGMEMP_ALLOC(txn->mt_env, np, sz);
}
if (pgno == P_INVALID) {
np->mp_pgno = txn->mt_next_pgno;
txn->mt_next_pgno += num;
} else {
if (txn->mt_env->me_flags & MDB_WRITEMAP) {
if (pgno == P_INVALID) {
pgno = txn->mt_next_pgno;
txn->mt_next_pgno += num;
}
np = (MDB_page *)(txn->mt_env->me_map + txn->mt_env->me_psize * pgno);
np->mp_pgno = pgno;
} else {
if (txn->mt_env->me_dpages && num == 1) {
np = txn->mt_env->me_dpages;
VGMEMP_ALLOC(txn->mt_env, np, txn->mt_env->me_psize);
VGMEMP_DEFINED(np, sizeof(np->mp_next));
txn->mt_env->me_dpages = np->mp_next;
} else {
size_t sz = txn->mt_env->me_psize * num;
if ((np = malloc(sz)) == NULL)
return NULL;
VGMEMP_ALLOC(txn->mt_env, np, sz);
}
if (pgno == P_INVALID) {
np->mp_pgno = txn->mt_next_pgno;
txn->mt_next_pgno += num;
} else {
np->mp_pgno = pgno;
}
}
mid.mid = np->mp_pgno;
mid.mptr = np;
mdb_mid2l_insert(txn->mt_u.dirty_list, &mid);
if (txn->mt_env->me_flags & MDB_WRITEMAP) {
mdb_mid2l_append(txn->mt_u.dirty_list, &mid);
} else {
mdb_mid2l_insert(txn->mt_u.dirty_list, &mid);
}
return np;
}
@ -1655,6 +1668,9 @@ mdb_txn_begin(MDB_env *env, MDB_txn *parent, unsigned int flags, MDB_txn **ret)
if (parent->mt_child) {
return EINVAL;
}
/* nested TXNs not supported here */
if (env->me_flags & MDB_WRITEMAP)
return EINVAL;
}
size = sizeof(MDB_txn) + env->me_maxdbs * (sizeof(MDB_db)+1);
if (!(flags & MDB_RDONLY))
@ -1741,17 +1757,19 @@ mdb_txn_reset0(MDB_txn *txn)
}
}
/* return all dirty pages to dpage list */
for (i=1; i<=txn->mt_u.dirty_list[0].mid; i++) {
dp = txn->mt_u.dirty_list[i].mptr;
if (!IS_OVERFLOW(dp) || dp->mp_pages == 1) {
dp->mp_next = txn->mt_env->me_dpages;
VGMEMP_FREE(txn->mt_env, dp);
txn->mt_env->me_dpages = dp;
} else {
/* large pages just get freed directly */
VGMEMP_FREE(txn->mt_env, dp);
free(dp);
if (!(env->me_flags & MDB_WRITEMAP)) {
/* return all dirty pages to dpage list */
for (i=1; i<=txn->mt_u.dirty_list[0].mid; i++) {
dp = txn->mt_u.dirty_list[i].mptr;
if (!IS_OVERFLOW(dp) || dp->mp_pages == 1) {
dp->mp_next = txn->mt_env->me_dpages;
VGMEMP_FREE(txn->mt_env, dp);
txn->mt_env->me_dpages = dp;
} else {
/* large pages just get freed directly */
VGMEMP_FREE(txn->mt_env, dp);
free(dp);
}
}
}
@ -2057,6 +2075,17 @@ again:
mdb_audit(txn);
#endif
if (env->me_flags & MDB_WRITEMAP) {
for (i=1; i<=txn->mt_u.dirty_list[0].mid; i++) {
dp = txn->mt_u.dirty_list[i].mptr;
/* clear dirty flag */
dp->mp_flags &= ~P_DIRTY;
txn->mt_u.dirty_list[i].mid = 0;
}
txn->mt_u.dirty_list[0].mid = 0;
goto sync;
}
/* Commit up to MDB_COMMIT_PAGES dirty pages to disk until done.
*/
next = 0;
@ -2165,6 +2194,7 @@ again:
}
txn->mt_u.dirty_list[0].mid = 0;
sync:
if ((n = mdb_env_sync(env, 0)) != 0 ||
(n = mdb_env_write_meta(txn)) != MDB_SUCCESS) {
mdb_txn_abort(txn);
@ -2323,6 +2353,14 @@ mdb_env_write_meta(MDB_txn *txn)
env = txn->mt_env;
if (env->me_flags & MDB_WRITEMAP) {
MDB_meta *mp = env->me_metas[toggle];
mp->mm_dbs[0] = txn->mt_dbs[0];
mp->mm_dbs[1] = txn->mt_dbs[1];
mp->mm_last_pg = txn->mt_next_pgno - 1;
mp->mm_txnid = txn->mt_txnid;
goto done;
}
metab.mm_txnid = env->me_metas[toggle]->mm_txnid;
metab.mm_last_pg = env->me_metas[toggle]->mm_last_pg;
@ -2368,6 +2406,7 @@ mdb_env_write_meta(MDB_txn *txn)
env->me_flags |= MDB_FATAL_ERROR;
return rc;
}
done:
/* Memory ordering issues are irrelevant; since the entire writer
* is wrapped by wmutex, all of these changes will become visible
* after the wmutex is unlocked. Since the DB is multi-version,
@ -2456,7 +2495,7 @@ mdb_env_get_maxreaders(MDB_env *env, unsigned int *readers)
static int
mdb_env_open2(MDB_env *env, unsigned int flags)
{
int i, newenv = 0;
int i, newenv = 0, prot;
MDB_meta meta;
MDB_page *p;
@ -2505,7 +2544,12 @@ mdb_env_open2(MDB_env *env, unsigned int flags)
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,
prot = PROT_READ;
if (flags & MDB_WRITEMAP) {
prot |= PROT_WRITE;
ftruncate(env->me_fd, env->me_mapsize);
}
env->me_map = mmap(meta.mm_address, env->me_mapsize, prot, i,
env->me_fd, 0);
if (env->me_map == MAP_FAILED) {
env->me_map = NULL;
@ -3434,6 +3478,11 @@ mdb_page_get(MDB_txn *txn, pgno_t pgno, MDB_page **ret)
{
MDB_page *p = NULL;
if (txn->mt_env->me_flags & MDB_WRITEMAP) {
if (pgno < txn->mt_next_pgno)
p = (MDB_page *)(txn->mt_env->me_map + txn->mt_env->me_psize * pgno);
goto done;
}
if (!F_ISSET(txn->mt_flags, MDB_TXN_RDONLY) && txn->mt_u.dirty_list[0].mid) {
unsigned x;
x = mdb_mid2l_search(txn->mt_u.dirty_list, pgno);
@ -3445,6 +3494,7 @@ mdb_page_get(MDB_txn *txn, pgno_t pgno, MDB_page **ret)
if (pgno < txn->mt_next_pgno)
p = (MDB_page *)(txn->mt_env->me_map + txn->mt_env->me_psize * pgno);
}
done:
*ret = p;
if (!p) {
DPRINTF("page %zu not found", pgno);

2
libraries/libmdb/mdb.h
View file

@ -161,6 +161,8 @@ typedef void (MDB_rel_func)(MDB_val *item, void *oldptr, void *newptr, void *rel
#define MDB_RDONLY 0x20000
/** don't fsync metapage after commit */
#define MDB_NOMETASYNC 0x40000
/** use writable mmap */
#define MDB_WRITEMAP 0x80000
/** @} */
/** @defgroup mdb_open Database Flags

12
libraries/libmdb/midl.c
View file

@ -311,5 +311,17 @@ int mdb_mid2l_insert( MDB_ID2L ids, MDB_ID2 *id )
return 0;
}
int mdb_mid2l_append( MDB_ID2L ids, MDB_ID2 *id )
{
/* Too big? */
if (ids[0].mid >= MDB_IDL_UM_MAX) {
return -2;
}
ids[0].mid++;
ids[ids[0].mid] = *id;
return 0;
}
/** @} */
/** @} */

7
libraries/libmdb/midl.h
View file

@ -180,6 +180,13 @@ unsigned mdb_mid2l_search( MDB_ID2L ids, MDB_ID id );
*/
int mdb_mid2l_insert( MDB_ID2L ids, MDB_ID2 *id );
/** Append an ID2 into a ID2L.
* @param[in,out] ids The ID2L to append into.
* @param[in] id The ID2 to append.
* @return 0 on success, -2 if the ID2L is too big.
*/
int mdb_mid2l_append( MDB_ID2L ids, MDB_ID2 *id );
/** @} */
/** @} */
#ifdef __cplusplus