btrfs: zoned: fix locking imbalance on scrub

If we're doing device replace on a zoned filesystem and discover in
scrub_enumerate_chunks() that we don't have to copy the block group it is
unlocked before it gets skipped.

But as the block group hasn't yet been locked before it leads to a locking
imbalance. To fix this simply remove the unlock.

This was uncovered by fstests' testcase btrfs/163.

Fixes: 9283b9e09a6d ("btrfs: remove lock protection for BLOCK_GROUP_FLAG_TO_COPY")
Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/fs/btrfs/scrub.c b/fs/btrfs/scrub.c
index b659c67..196c4c6 100644 (file)
--- a/fs/btrfs/scrub.c
+++ b/fs/btrfs/scrub.c
@@ -3911,7 +3911,6 @@ int scrub_enumerate_chunks(struct scrub_ctx *sctx,
 
                if (sctx->is_dev_replace && btrfs_is_zoned(fs_info)) {
                        if (!test_bit(BLOCK_GROUP_FLAG_TO_COPY, &cache->runtime_flags)) {
-                               spin_unlock(&cache->lock);
                                btrfs_put_block_group(cache);
                                goto skip;
                        }