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ITS#7126 fix cursor tracking code

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Don't compare cursors that aren't deep enough to match the
current cursor.
This commit is contained in:
Howard Chu 2012-01-21 08:12:56 -08:00
parent 713bf092b6
commit b9cbcb0588
1 changed files with 8 additions and 3 deletions
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11
libraries/libmdb/mdb.c
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@ -1234,6 +1234,7 @@ finish:
for (m2 = mc->mc_txn->mt_cursors[dbi]; m2; m2=m2->mc_next) {
if (m2 == mc) continue;
m3 = &m2->mc_xcursor->mx_cursor;
if (m3->mc_snum < mc->mc_snum) continue;
if (m3->mc_pg[mc->mc_top] == mc->mc_pg[mc->mc_top]) {
m3->mc_pg[mc->mc_top] = mp;
}
@ -1242,7 +1243,7 @@ finish:
MDB_cursor *m2;
for (m2 = mc->mc_txn->mt_cursors[mc->mc_dbi]; m2; m2=m2->mc_next) {
if (m2 == mc) continue;
if (m2 == mc || m2->mc_snum < mc->mc_snum) continue;
if (m2->mc_pg[mc->mc_top] == mc->mc_pg[mc->mc_top]) {
m2->mc_pg[mc->mc_top] = mp;
}
@ -4167,7 +4168,7 @@ new_sub:
m3 = &m2->mc_xcursor->mx_cursor;
else
m3 = m2;
if (m3 == mc) continue;
if (m3 == mc || m3->mc_snum < mc->mc_snum) continue;
if (m3->mc_pg[i] == mp && m3->mc_ki[i] >= mc->mc_ki[i]) {
m3->mc_ki[i]++;
}
@ -4208,7 +4209,7 @@ put_sub:
MDB_page *mp = mc->mc_pg[i];
for (m2 = mc->mc_txn->mt_cursors[mc->mc_dbi]; m2; m2=m2->mc_next) {
if (m2 == mc) continue;
if (m2 == mc || m2->mc_snum < mc->mc_snum) continue;
if (m2->mc_pg[i] == mp && m2->mc_ki[i] == mc->mc_ki[i]) {
mdb_xcursor_init1(m2, leaf);
}
@ -4713,6 +4714,7 @@ mdb_cursor_init(MDB_cursor *mc, MDB_txn *txn, MDB_dbi dbi, MDB_xcursor *mx)
mc->mc_dbx = &txn->mt_dbxs[dbi];
mc->mc_dbflag = &txn->mt_dbflags[dbi];
mc->mc_snum = 0;
mc->mc_top = 0;
mc->mc_flags = 0;
if (txn->mt_dbs[dbi].md_flags & MDB_DUPSORT) {
assert(mx != NULL);
@ -5076,6 +5078,7 @@ mdb_page_merge(MDB_cursor *csrc, MDB_cursor *cdst)
m3 = &m2->mc_xcursor->mx_cursor;
else
m3 = m2;
if (m3->mc_snum < csrc->mc_snum) continue;
if (m3->mc_pg[csrc->mc_top] == csrc->mc_pg[csrc->mc_top]) {
m3->mc_pg[csrc->mc_top] = mp;
m3->mc_ki[csrc->mc_top] += nkeys;
@ -5167,6 +5170,7 @@ mdb_rebalance(MDB_cursor *mc)
m3 = &m2->mc_xcursor->mx_cursor;
else
m3 = m2;
if (m3->mc_snum < mc->mc_snum) continue;
if (m3->mc_pg[0] == mp) {
m3->mc_snum = 0;
m3->mc_top = 0;
@ -5196,6 +5200,7 @@ mdb_rebalance(MDB_cursor *mc)
m3 = &m2->mc_xcursor->mx_cursor;
else
m3 = m2;
if (m3->mc_snum < mc->mc_snum) continue;
if (m3->mc_pg[0] == mp) {
m3->mc_pg[0] = mc->mc_pg[0];
}