btrfs: zoned: fix missing endianness conversion in sb_write_pointer

commit c51f0e6a1254b3ac2d308e1c6fd8fb936992b455 upstream.

generation is an on-disk __le64 value, so use btrfs_super_generation to
convert it to host endian before comparing it.

Fixes: 12659251ca5d ("btrfs: implement log-structured superblock for ZONED mode")
CC: stable@vger.kernel.org # 5.15+
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/fs/btrfs/zoned.c b/fs/btrfs/zoned.c
index 96958ca..073829b 100644 (file)
--- a/fs/btrfs/zoned.c
+++ b/fs/btrfs/zoned.c
@@ -114,7 +114,8 @@ static int sb_write_pointer(struct block_device *bdev, struct blk_zone *zones,
                        super[i] = page_address(page[i]);
                }
 
-               if (super[0]->generation > super[1]->generation)
+               if (btrfs_super_generation(super[0]) >
+                   btrfs_super_generation(super[1]))
                        sector = zones[1].start;
                else
                        sector = zones[0].start;