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Drop unneeded code.

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MDB_txn.mt_toggle: Use (mt_txnid & 1) instead.
Drop error checks which will be repeated.
mdb_cursor_set(): Turn assert into if/return to match the above.
mdb_cursor_del(): 'flags' are now used as bitflags.
This commit is contained in:
Hallvard Furuseth 2013-09-23 20:21:11 +02:00
parent 2980bd30f5
commit e3f6c152c5
1 changed files with 13 additions and 24 deletions
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37
libraries/liblmdb/mdb.c
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@ -898,10 +898,6 @@ struct MDB_txn {
* dirty_list into mt_parent after freeing hidden mt_parent pages.
*/
unsigned int mt_dirty_room;
/** Tracks which of the two meta pages was used at the start
* of this transaction.
*/
unsigned int mt_toggle;
};
/** Enough space for 2^32 nodes with minimum of 2 keys per node. I.e., plenty.
@ -2118,6 +2114,7 @@ static int
mdb_txn_renew0(MDB_txn *txn)
{
MDB_env *env = txn->mt_env;
MDB_meta *meta;
unsigned int i;
uint16_t x;
int rc, new_notls = 0;
@ -2128,8 +2125,8 @@ mdb_txn_renew0(MDB_txn *txn)
if (txn->mt_flags & MDB_TXN_RDONLY) {
if (!env->me_txns) {
i = mdb_env_pick_meta(env);
txn->mt_txnid = env->me_metas[i]->mm_txnid;
meta = env->me_metas[ mdb_env_pick_meta(env) ];
txn->mt_txnid = meta->mm_txnid;
txn->mt_u.reader = NULL;
} else {
MDB_reader *r = (env->me_flags & MDB_NOTLS) ? txn->mt_u.reader :
@ -2174,13 +2171,13 @@ mdb_txn_renew0(MDB_txn *txn)
}
txn->mt_txnid = r->mr_txnid = env->me_txns->mti_txnid;
txn->mt_u.reader = r;
meta = env->me_metas[txn->mt_txnid & 1];
}
txn->mt_toggle = txn->mt_txnid & 1;
} else {
LOCK_MUTEX_W(env);
txn->mt_txnid = env->me_txns->mti_txnid;
txn->mt_toggle = txn->mt_txnid & 1;
meta = env->me_metas[txn->mt_txnid & 1];
txn->mt_txnid++;
#if MDB_DEBUG
if (txn->mt_txnid == mdb_debug_start)
@ -2196,10 +2193,10 @@ mdb_txn_renew0(MDB_txn *txn)
}
/* Copy the DB info and flags */
memcpy(txn->mt_dbs, env->me_metas[txn->mt_toggle]->mm_dbs, 2 * sizeof(MDB_db));
memcpy(txn->mt_dbs, meta->mm_dbs, 2 * sizeof(MDB_db));
/* Moved to here to avoid a data race in read TXNs */
txn->mt_next_pgno = env->me_metas[txn->mt_toggle]->mm_last_pg+1;
txn->mt_next_pgno = meta->mm_last_pg+1;
for (i=2; i<txn->mt_numdbs; i++) {
x = env->me_dbflags[i];
@ -2295,7 +2292,6 @@ mdb_txn_begin(MDB_env *env, MDB_txn *parent, unsigned int flags, MDB_txn **ret)
return ENOMEM;
}
txn->mt_txnid = parent->mt_txnid;
txn->mt_toggle = parent->mt_toggle;
txn->mt_dirty_room = parent->mt_dirty_room;
txn->mt_u.dirty_list[0].mid = 0;
txn->mt_spill_pgs = NULL;
@ -3093,7 +3089,7 @@ mdb_env_write_meta(MDB_txn *txn)
assert(txn != NULL);
assert(txn->mt_env != NULL);
toggle = !txn->mt_toggle;
toggle = txn->mt_txnid & 1;
DPRINTF(("writing meta page %d for root page %"Z"u",
toggle, txn->mt_dbs[MAIN_DBI].md_root));
@ -4878,7 +4874,7 @@ mdb_get(MDB_txn *txn, MDB_dbi dbi,
if (txn->mt_flags & MDB_TXN_ERROR)
return MDB_BAD_TXN;
if (key->mv_size == 0 || key->mv_size > MDB_MAXKEYSIZE) {
if (key->mv_size > MDB_MAXKEYSIZE) {
return MDB_BAD_VALSIZE;
}
@ -5107,7 +5103,8 @@ mdb_cursor_set(MDB_cursor *mc, MDB_val *key, MDB_val *data,
assert(mc);
assert(key);
assert(key->mv_size > 0);
if (key->mv_size == 0)
return MDB_BAD_VALSIZE;
if (mc->mc_xcursor)
mc->mc_xcursor->mx_cursor.mc_flags &= ~(C_INITIALIZED|C_EOF);
@ -5431,7 +5428,7 @@ mdb_cursor_get(MDB_cursor *mc, MDB_val *key, MDB_val *data,
case MDB_SET_RANGE:
if (key == NULL) {
rc = EINVAL;
} else if (key->mv_size == 0 || key->mv_size > MDB_MAXKEYSIZE) {
} else if (key->mv_size > MDB_MAXKEYSIZE) {
rc = MDB_BAD_VALSIZE;
} else if (op == MDB_SET_RANGE)
rc = mdb_cursor_set(mc, key, data, op, NULL);
@ -6051,7 +6048,6 @@ mdb_cursor_del(MDB_cursor *mc, unsigned int flags)
if (!(flags & MDB_NOSPILL) && (rc = mdb_page_spill(mc, NULL, NULL)))
return rc;
flags &= ~MDB_NOSPILL; /* TODO: Or change (flags != MDB_NODUPDATA) to ~(flags & MDB_NODUPDATA), not looking at the logic of that code just now */
rc = mdb_cursor_touch(mc);
if (rc)
@ -7301,7 +7297,7 @@ mdb_del(MDB_txn *txn, MDB_dbi dbi,
if (txn->mt_flags & (MDB_TXN_RDONLY|MDB_TXN_ERROR))
return (txn->mt_flags & MDB_TXN_RDONLY) ? EACCES : MDB_BAD_TXN;
if (key->mv_size == 0 || key->mv_size > MDB_MAXKEYSIZE) {
if (key->mv_size > MDB_MAXKEYSIZE) {
return MDB_BAD_VALSIZE;
}
@ -7765,13 +7761,6 @@ mdb_put(MDB_txn *txn, MDB_dbi dbi,
if (txn == NULL || !dbi || dbi >= txn->mt_numdbs || !(txn->mt_dbflags[dbi] & DB_VALID))
return EINVAL;
if (txn->mt_flags & (MDB_TXN_RDONLY|MDB_TXN_ERROR))
return (txn->mt_flags & MDB_TXN_RDONLY) ? EACCES : MDB_BAD_TXN;
if (key->mv_size == 0 || key->mv_size > MDB_MAXKEYSIZE) {
return MDB_BAD_VALSIZE;
}
if ((flags & (MDB_NOOVERWRITE|MDB_NODUPDATA|MDB_RESERVE|MDB_APPEND|MDB_APPENDDUP)) != flags)
return EINVAL;