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lmdb: Cleanup MDB_env.me_txn0.

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More fallout from 4d02c741b120786df1b87ee9ed49c1d3f9bc7522.

Change-Id: I3bbd913c7da3e45f00f1d40c0aac6e7bf5f48c69
This commit is contained in:
Hallvard Furuseth 2015-04-08 21:52:05 +02:00 committed by Leo Yuriev
parent dba429d608
commit 5ac6404059
1 changed files with 16 additions and 16 deletions
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32
mdb.c
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@ -3029,6 +3029,7 @@ mdb_txn_renew0(MDB_txn *txn)
meta = env->me_metas[txn->mt_txnid & 1];
}
} else {
/* Not yet touching txn == env->me_txn0, it may be active */
if (ti) {
if (LOCK_MUTEX(rc, env, MDB_MUTEX(env, w)))
return rc;
@ -3114,7 +3115,7 @@ mdb_txn_begin(MDB_env *env, MDB_txn *parent, unsigned int flags, MDB_txn **ret)
{
MDB_txn *txn;
MDB_ntxn *ntxn;
int rc, size, tsize = sizeof(MDB_txn);
int rc, size, tsize;
flags &= MDB_TXN_BEGIN_FLAGS;
flags |= env->me_flags & MDB_WRITEMAP;
@ -3125,6 +3126,8 @@ mdb_txn_begin(MDB_env *env, MDB_txn *parent, unsigned int flags, MDB_txn **ret)
}
if (env->me_flags & MDB_RDONLY & ~flags) /* write txn in RDONLY env */
return EACCES;
size = tsize = sizeof(MDB_txn);
if (parent) {
/* Nested transactions: Max 1 child, write txns only, no writemap */
flags |= parent->mt_flags;
@ -3133,16 +3136,15 @@ mdb_txn_begin(MDB_env *env, MDB_txn *parent, unsigned int flags, MDB_txn **ret)
{
return (parent->mt_flags & MDB_TXN_RDONLY) ? EINVAL : MDB_BAD_TXN;
}
tsize = sizeof(MDB_ntxn);
}
size = tsize;
if (!(flags & MDB_RDONLY)) {
if (!parent) {
txn = env->me_txn0; /* just reuse preallocated write txn */
goto ok;
}
/* child txns use own copy of cursors */
/* Child txns save MDB_pgstate and use own copy of cursors */
size = tsize = sizeof(MDB_ntxn);
size += env->me_maxdbs * sizeof(MDB_cursor *);
} else if (!(flags & MDB_RDONLY)) {
/* Reuse preallocated write txn. However, do not touch it until
* mdb_txn_renew0() succeeds, since it currently may be active.
*/
txn = env->me_txn0;
goto renew;
}
size += env->me_maxdbs * (sizeof(MDB_db)+1);
@ -3168,7 +3170,6 @@ mdb_txn_begin(MDB_env *env, MDB_txn *parent, unsigned int flags, MDB_txn **ret)
txn->mt_flags = flags;
txn->mt_env = env;
ok:
if (parent) {
unsigned int i;
txn->mt_u.dirty_list = malloc(sizeof(MDB_ID2)*MDB_IDL_UM_SIZE);
@ -3208,6 +3209,7 @@ ok:
if (rc)
mdb_txn_reset0(txn, "beginchild-fail");
} else {
renew:
rc = mdb_txn_renew0(txn);
}
if (rc) {
@ -5330,15 +5332,13 @@ mdb_env_open(MDB_env *env, const char *path, unsigned int flags, mdb_mode_t mode
if (rc)
goto leave;
}
if (!((flags & MDB_RDONLY) ||
(env->me_pbuf = calloc(1, env->me_psize))))
rc = ENOMEM;
if (!(flags & MDB_RDONLY)) {
MDB_txn *txn;
int tsize = sizeof(MDB_txn), size = tsize + env->me_maxdbs *
(sizeof(MDB_db)+sizeof(MDB_cursor *)+sizeof(unsigned int)+1);
txn = calloc(1, size);
if (txn) {
if ((env->me_pbuf = calloc(1, env->me_psize)) &&
(txn = calloc(1, size)))
{
txn->mt_dbs = (MDB_db *)((char *)txn + tsize);
txn->mt_cursors = (MDB_cursor **)(txn->mt_dbs + env->me_maxdbs);
txn->mt_dbiseqs = (unsigned int *)(txn->mt_cursors + env->me_maxdbs);