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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>
This commit is contained in:
Anand Jain 2023-07-31 19:16:32 +08:00 committed by David Sterba
parent 182741d287
commit 4844c3664a
2 changed files with 9 additions and 0 deletions
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8
fs/btrfs/volumes.c
View File

@ -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

1
fs/btrfs/volumes.h
View File

@ -747,5 +747,6 @@ int btrfs_verify_dev_extents(struct btrfs_fs_info *fs_info);
bool btrfs_repair_one_zone(struct btrfs_fs_info *fs_info, u64 logical);
bool btrfs_pinned_by_swapfile(struct btrfs_fs_info *fs_info, void *ptr);
u8 *btrfs_sb_fsid_ptr(struct btrfs_super_block *sb);
#endif