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Skip unneeded calls to mdb_page_get in mdb_page_search

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This commit is contained in:
Howard Chu 2012-07-23 04:23:49 -07:00
parent ccc4d23e74
commit 205bb17793
1 changed files with 19 additions and 4 deletions
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23
libraries/libmdb/mdb.c
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@ -3524,8 +3524,9 @@ mdb_page_search(MDB_cursor *mc, MDB_val *key, int flags)
}
assert(root > 1);
if ((rc = mdb_page_get(mc->mc_txn, root, &mc->mc_pg[0])))
return rc;
if (!mc->mc_pg[0] || mc->mc_pg[0]->mp_pgno != root)
if ((rc = mdb_page_get(mc->mc_txn, root, &mc->mc_pg[0])))
return rc;
mc->mc_snum = 1;
mc->mc_top = 0;
@ -3832,7 +3833,6 @@ mdb_cursor_set(MDB_cursor *mc, MDB_val *key, MDB_val *data,
* was the one we wanted.
*/
mc->mc_ki[mc->mc_top] = 0;
leaf = NODEPTR(mp, 0);
if (exactp)
*exactp = 1;
goto set1;
@ -3852,13 +3852,26 @@ mdb_cursor_set(MDB_cursor *mc, MDB_val *key, MDB_val *data,
if (rc == 0) {
/* last node was the one we wanted */
mc->mc_ki[mc->mc_top] = nkeys-1;
leaf = NODEPTR(mp, nkeys-1);
if (exactp)
*exactp = 1;
goto set1;
}
if (rc < 0) {
/* This is definitely the right page, skip search_page */
if (mp->mp_flags & P_LEAF2) {
nodekey.mv_data = LEAF2KEY(mp,
mc->mc_ki[mc->mc_top], nodekey.mv_size);
} else {
leaf = NODEPTR(mp, mc->mc_ki[mc->mc_top]);
MDB_SET_KEY(leaf, &nodekey);
}
rc = mc->mc_dbx->md_cmp(key, &nodekey);
if (rc == 0) {
/* current node was the one we wanted */
if (exactp)
*exactp = 1;
goto set1;
}
rc = 0;
goto set2;
}
@ -4986,6 +4999,7 @@ mdb_xcursor_init1(MDB_cursor *mc, MDB_node *node)
if (node->mn_flags & F_SUBDATA) {
memcpy(&mx->mx_db, NODEDATA(node), sizeof(MDB_db));
mx->mx_cursor.mc_pg[0] = 0;
mx->mx_cursor.mc_snum = 0;
mx->mx_cursor.mc_flags = C_SUB;
} else {
@ -5038,6 +5052,7 @@ mdb_cursor_init(MDB_cursor *mc, MDB_txn *txn, MDB_dbi dbi, MDB_xcursor *mx)
mc->mc_dbflag = &txn->mt_dbflags[dbi];
mc->mc_snum = 0;
mc->mc_top = 0;
mc->mc_pg[0] = 0;
mc->mc_flags = 0;
if (txn->mt_dbs[dbi].md_flags & MDB_DUPSORT) {
assert(mx != NULL);