Btrfs: Fix race in btrfs_mark_extent_written
Fix bug reported by Johannes Hirte. The reason of that bug is btrfs_del_items is called after btrfs_duplicate_item and btrfs_del_items triggers tree balance. The fix is check that case and call btrfs_search_slot when needed. Signed-off-by: Yan Zheng <zheng.yan@oracle.com> Signed-off-by: Chris Mason <chris.mason@oracle.com>
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