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btrfs: zoned: fix unpaired block group unfreeze during device replace 

When doing a device replace on a zoned filesystem, if we find a block
group with ->to_copy == 0, we jump to the label 'done', which will result
in later calling btrfs_unfreeze_block_group(), even though at this point
we never called btrfs_freeze_block_group().

Since at this point we have neither turned the block group to RO mode nor
made any progress, we don't need to jump to the label 'done'. So fix this
by jumping instead to the label 'skip' and dropping our reference on the
block group before the jump.

Fixes: 78ce9fc269 ("btrfs: zoned: mark block groups to copy for device-replace")
CC: stable@vger.kernel.org # 5.12
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Filipe Manana 2021-04-14 14:05:26 +01:00 committed by David Sterba
parent f9690f426b
commit 0dc16ef4f6
1 changed files with 2 additions and 3 deletions
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5
fs/btrfs/scrub.c
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@ -3674,8 +3674,8 @@ int scrub_enumerate_chunks(struct scrub_ctx *sctx,
spin_lock(&cache->lock);
if (!cache->to_copy) {
spin_unlock(&cache->lock);
ro_set = 0;
goto done;
btrfs_put_block_group(cache);
goto skip;
}
spin_unlock(&cache->lock);
}
@ -3833,7 +3833,6 @@ int scrub_enumerate_chunks(struct scrub_ctx *sctx,
cache, found_key.offset))
ro_set = 0;
done:
down_write(&dev_replace->rwsem);
dev_replace->cursor_left = dev_replace->cursor_right;
dev_replace->item_needs_writeback = 1;