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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>
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@ -2156,7 +2156,8 @@ again:
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ret = find_first_extent_bit(&info->extent_ins, search, &start,
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&end, EXTENT_WRITEBACK);
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if (ret) {
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if (skipped && all && !num_inserts) {
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if (skipped && all && !num_inserts &&
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list_empty(&update_list)) {
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skipped = 0;
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search = 0;
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continue;
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@ -2544,6 +2545,7 @@ again:
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if (ret) {
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if (all && skipped && !nr) {
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search = 0;
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skipped = 0;
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continue;
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}
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mutex_unlock(&info->extent_ins_mutex);
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