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| author | Anand Jain <anand.jain@oracle.com> | 2023-07-31 19:16:32 +0800 |
|---|---|---|
| committer | David Sterba <dsterba@suse.com> | 2023-08-21 14:54:48 +0200 |
| commit | 4844c3664a72d36cc79752cb651c78860b14c240 (patch) | |
| tree | b5f589102b8fefa97abab40da23277689853e3b4 /fs/btrfs/volumes.c | |
| parent | 182741d287fb1ea870ee6ef45aa1915a0b031233 (diff) | |
| download | lwn-4844c3664a72d36cc79752cb651c78860b14c240.tar.gz lwn-4844c3664a72d36cc79752cb651c78860b14c240.zip | |
btrfs: add a helper to read the superblock metadata_uuid
In some cases, we need to read the FSID from the superblock when the
metadata_uuid is not set, and otherwise, read the metadata_uuid. So,
add a helper.
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/volumes.c')
| -rw-r--r-- | fs/btrfs/volumes.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c index bfdfecee1afe..2669206e6f15 100644 --- a/fs/btrfs/volumes.c +++ b/fs/btrfs/volumes.c @@ -681,6 +681,14 @@ error_free_page: return -EINVAL; } +u8 *btrfs_sb_fsid_ptr(struct btrfs_super_block *sb) +{ + bool has_metadata_uuid = (btrfs_super_incompat_flags(sb) & + BTRFS_FEATURE_INCOMPAT_METADATA_UUID); + + return has_metadata_uuid ? sb->metadata_uuid : sb->fsid; +} + /* * Handle scanned device having its CHANGING_FSID_V2 flag set and the fs_devices * being created with a disk that has already completed its fsid change. Such |