[PATCH 5.18 053/879] btrfs: zoned: fix comparison of alloc_offset vs meta_write_pointer

Greg Kroah-Hartman
2022-06-07T21:59:01Z

From: Naohiro Aota <naohiro.aota@wdc.com>

commit aa9ffadfcae33e611d8c2d476bcc2aa0d273b587 upstream.

The block_group->alloc_offset is an offset from the start of the block
group. OTOH, the ->meta_write_pointer is an address in the logical
space. So, we should compare the alloc_offset shifted with the
block_group->start.

Fixes: afba2bc036b0 ("btrfs: zoned: implement active zone tracking")
CC: stable@vger.kernel.org # 5.16+
Signed-off-by: Naohiro Aota <naohiro.aota@wdc.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
fs/btrfs/zoned.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

--- a/fs/btrfs/zoned.c
+++ b/fs/btrfs/zoned.c
@@ -1896,7 +1896,7 @@ int btrfs_zone_finish(struct btrfs_block
/* Check if we have unwritten allocated space */
if ((block_group->flags &
(BTRFS_BLOCK_GROUP_METADATA | BTRFS_BLOCK_GROUP_SYSTEM)) &&
- block_group->alloc_offset > block_group->meta_write_pointer) {
+ block_group->start + block_group->alloc_offset > block_group->meta_write_pointer) {
spin_unlock(&block_group->lock);
return -EAGAIN;
}