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Qu Wenruo authored
Current btrfs_orphan_cleanup will also cleanup roots which is already in fs_info->dead_roots without protection. This will have conditional race with fs_info->cleaner_kthread. This patch will use refs in root->root_item to detect roots in dead_roots and avoid conflicts. Signed-off-by:
Qu Wenruo <quwenruo@cn.fujitsu.com> Signed-off-by:
Chris Mason <clm@fb.com>
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