Commit 5a7be515 authored Jan 21, 2009 by Yan Zheng Committed by Chris Mason Jan 21, 2009

Btrfs: Fix infinite loop in btrfs_extent_post_op



btrfs_extent_post_op calls finish_current_insert and del_pending_extents. They
both may enter infinite loops.

finish_current_insert enters infinite loop if it only finds some backrefs to
update.  The fix is to check for pending backref updates before restarting the
loop.

The infinite loop in del_pending_extents is due to a the skipped variable
not being properly reset before looping around.

Signed-off-by: Yan Zheng <zheng.yan@oracle.com>

parent 3dfdb934

fs/btrfs/extent-tree.c

+3 −1

Original line number	Diff line number	Diff line
		@@ -2156,7 +2156,8 @@ static int finish_current_insert(struct btrfs_trans_handle *trans,
		ret = find_first_extent_bit(&info->extent_ins, search, &start,
		&end, EXTENT_WRITEBACK);
		if (ret) {
		if (skipped && all && !num_inserts) {
		if (skipped && all && !num_inserts &&
		list_empty(&update_list)) {
		skipped = 0;
		search = 0;
		continue;
		@@ -2544,6 +2545,7 @@ static int del_pending_extents(struct btrfs_trans_handle *trans,
		if (ret) {
		if (all && skipped && !nr) {
		search = 0;
		skipped = 0;
		continue;
		}
		mutex_unlock(&info->extent_ins_mutex);