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lmdb: ITS#7771 fix cursor tracking on fake pages.

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node_del shifts nodes around, cursors pointing at fake pages
need to have their mc_pg[0] corrected.

Includes ITS#7771 more for prev commit.
This commit is contained in:
Howard Chu 2015-10-12 00:08:41 +01:00 committed by Leo Yuriev
parent f6045ae77e
commit ad808146c8
1 changed files with 19 additions and 6 deletions
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25
mdb.c
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@ -6673,8 +6673,14 @@ put_sub:
for (m2 = mc->mc_txn->mt_cursors[mc->mc_dbi]; m2; m2=m2->mc_next) {
if (m2 == mc || m2->mc_snum < mc->mc_snum) continue;
if (!(m2->mc_flags & C_INITIALIZED)) continue;
if (m2->mc_pg[i] == mp && m2->mc_ki[i] == mc->mc_ki[i]) {
mdb_xcursor_init2(m2, mx, new_dupdata);
if (m2->mc_pg[i] == mp) {
if (m2->mc_ki[i] == mc->mc_ki[i]) {
mdb_xcursor_init2(m2, mx, new_dupdata);
} else if (!insert_key) {
MDB_node *n2 = NODEPTR(mp, m2->mc_ki[i]);
if (!(n2->mn_flags & F_SUBDATA))
m2->mc_xcursor->mx_cursor.mc_pg[0] = NODEDATA(n2);
}
}
}
}
@ -6772,12 +6778,19 @@ mdb_cursor_del(MDB_cursor *mc, unsigned flags)
mdb_node_shrink(mp, mc->mc_ki[mc->mc_top]);
leaf = NODEPTR(mp, mc->mc_ki[mc->mc_top]);
mc->mc_xcursor->mx_cursor.mc_pg[0] = NODEDATA(leaf);
/* fix other sub-DB cursors pointed at this fake page */
/* fix other sub-DB cursors pointed at fake pages on this page */
for (m2 = mc->mc_txn->mt_cursors[mc->mc_dbi]; m2; m2=m2->mc_next) {
if (m2 == mc || m2->mc_snum < mc->mc_snum) continue;
if (m2->mc_pg[mc->mc_top] == mp &&
m2->mc_ki[mc->mc_top] == mc->mc_ki[mc->mc_top])
m2->mc_xcursor->mx_cursor.mc_pg[0] = NODEDATA(leaf);
if (!(m2->mc_flags & C_INITIALIZED)) continue;
if (m2->mc_pg[mc->mc_top] == mp) {
if (m2->mc_ki[mc->mc_top] == mc->mc_ki[mc->mc_top]) {
m2->mc_xcursor->mx_cursor.mc_pg[0] = NODEDATA(leaf);
} else {
MDB_node *n2 = NODEPTR(mp, m2->mc_ki[mc->mc_top]);
if (!(n2->mn_flags & F_SUBDATA))
m2->mc_xcursor->mx_cursor.mc_pg[0] = NODEDATA(n2);
}
}
}
}
mc->mc_db->md_entries--;