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| author | Anand Jain <anand.jain@oracle.com> | 2023-07-31 19:16:36 +0800 |
|---|---|---|
| committer | David Sterba <dsterba@suse.com> | 2023-08-21 14:54:48 +0200 |
| commit | 67bc5ad04bea699371a2d52e89690e54963e1397 (patch) | |
| tree | db170876eb9b484dc29b06ecba11edac8b3f47cd /fs/btrfs/disk-io.c | |
| parent | 6bfe3959b0e7a526f5c64747801a8613f002f05a (diff) | |
| download | linux-67bc5ad04bea699371a2d52e89690e54963e1397.tar.gz linux-67bc5ad04bea699371a2d52e89690e54963e1397.tar.bz2 linux-67bc5ad04bea699371a2d52e89690e54963e1397.zip | |
btrfs: drop redundant check to use fs_devices::metadata_uuid
fs_devices::metadata_uuid value is already updated based on the
super_block::METADATA_UUID flag for either fsid or metadata_uuid as
appropriate. So, fs_devices::metadata_uuid can be used directly.
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Tested-by: Guilherme G. Piccoli <gpiccoli@igalia.com>
Signed-off-by: Anand Jain <anand.jain@oracle.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs/btrfs/disk-io.c')
| -rw-r--r-- | fs/btrfs/disk-io.c | 15 |
1 files changed, 5 insertions, 10 deletions
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c index 32ec651c570f..0a96ea8c1d3a 100644 --- a/fs/btrfs/disk-io.c +++ b/fs/btrfs/disk-io.c @@ -313,21 +313,16 @@ static bool check_tree_block_fsid(struct extent_buffer *eb) struct btrfs_fs_info *fs_info = eb->fs_info; struct btrfs_fs_devices *fs_devices = fs_info->fs_devices, *seed_devs; u8 fsid[BTRFS_FSID_SIZE]; - u8 *metadata_uuid; read_extent_buffer(eb, fsid, offsetof(struct btrfs_header, fsid), BTRFS_FSID_SIZE); + /* - * Checking the incompat flag is only valid for the current fs. For - * seed devices it's forbidden to have their uuid changed so reading - * ->fsid in this case is fine + * alloc_fs_devices() copies the fsid into metadata_uuid if the + * metadata_uuid is unset in the superblock, including for a seed device. + * So, we can use fs_devices->metadata_uuid. */ - if (btrfs_fs_incompat(fs_info, METADATA_UUID)) - metadata_uuid = fs_devices->metadata_uuid; - else - metadata_uuid = fs_devices->fsid; - - if (!memcmp(fsid, metadata_uuid, BTRFS_FSID_SIZE)) + if (memcmp(fsid, fs_info->fs_devices->metadata_uuid, BTRFS_FSID_SIZE) == 0) return false; list_for_each_entry(seed_devs, &fs_devices->seed_list, seed_list) |