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Fixup other cursors after delete op

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This commit is contained in:
Howard Chu 2013-07-09 14:21:35 -07:00
parent a77767013a
commit 64676da8d9
1 changed files with 29 additions and 2 deletions
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31
libraries/liblmdb/mdb.c
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@ -6544,9 +6544,14 @@ static int
mdb_cursor_del0(MDB_cursor *mc, MDB_node *leaf)
{
int rc;
MDB_page *mp;
indx_t ki;
mp = mc->mc_pg[mc->mc_top];
ki = mc->mc_ki[mc->mc_top];
/* add overflow pages to free list */
if (!IS_LEAF2(mc->mc_pg[mc->mc_top]) && F_ISSET(leaf->mn_flags, F_BIGDATA)) {
if (!IS_LEAF2(mp) && F_ISSET(leaf->mn_flags, F_BIGDATA)) {
MDB_page *omp;
pgno_t pg;
@ -6555,7 +6560,7 @@ mdb_cursor_del0(MDB_cursor *mc, MDB_node *leaf)
(rc = mdb_ovpage_free(mc, omp)))
return rc;
}
mdb_node_del(mc->mc_pg[mc->mc_top], mc->mc_ki[mc->mc_top], mc->mc_db->md_pad);
mdb_node_del(mp, ki, mc->mc_db->md_pad);
mc->mc_db->md_entries--;
rc = mdb_rebalance(mc);
if (rc != MDB_SUCCESS)
@ -6564,6 +6569,28 @@ mdb_cursor_del0(MDB_cursor *mc, MDB_node *leaf)
else if (mc->mc_ki[mc->mc_top] >= NUMKEYS(mc->mc_pg[mc->mc_top]))
mc->mc_flags &= ~C_INITIALIZED;
{
/* Adjust other cursors pointing to mp */
MDB_cursor *m2;
unsigned int nkeys;
MDB_dbi dbi = mc->mc_dbi;
mp = mc->mc_pg[mc->mc_top];
nkeys = NUMKEYS(mp);
for (m2 = mc->mc_txn->mt_cursors[dbi]; m2; m2=m2->mc_next) {
if (m2 == mc)
continue;
if (!(m2->mc_flags & C_INITIALIZED))
continue;
if (m2->mc_pg[mc->mc_top] == mp) {
if (m2->mc_ki[mc->mc_top] > ki)
m2->mc_ki[mc->mc_top]--;
if (m2->mc_ki[mc->mc_top] >= nkeys)
m2->mc_flags &= ~C_INITIALIZED;
}
}
}
return rc;
}