Btrfs: fix mutex unlock without prior lock on space cache truncation
If the call to btrfs_truncate_inode_items() failed and we don't have a block group, we were unlocking the cache_write_mutex without having locked it (we do it only if we have a block group). Fixes: 1bbc621e ("Btrfs: allow block group cache writeout outside critical section in commit") Signed-off-by: NFilipe Manana <fdmanana@suse.com> Reviewed-by: NDavid Sterba <dsterba@suse.cz> Signed-off-by: NChris Mason <clm@fb.com>
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