From: Christoph Hellwig <hch@lst.de>
Date: Tue, 15 Nov 2022 09:39:44 +0000 (+0100)
Subject: btrfs: zoned: fix missing endianness conversion in sb_write_pointer
X-Git-Tag: v6.1-rc7~17^2~5
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=c51f0e6a1254b3ac2d308e1c6fd8fb936992b455;p=thirdparty%2Flinux.git

btrfs: zoned: fix missing endianness conversion in sb_write_pointer

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>
---

diff --git a/fs/btrfs/zoned.c b/fs/btrfs/zoned.c
index 1912abf6d0207..44d8177eeffce 100644
--- a/fs/btrfs/zoned.c
+++ b/fs/btrfs/zoned.c
@@ -134,7 +134,8 @@ 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;