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btrfs: update comment for temp-fsid, fsid, and metadata_uuid

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Update the comment to explain the relationship between temp_fsid, fsid,
and metadata_uuid.

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 2023-10-04 23:00:24 +08:00 committed by David Sterba
parent 3cf63ddf29
commit 000331bb03
1 changed files with 4 additions and 0 deletions
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4
fs/btrfs/volumes.h
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@ -299,6 +299,10 @@ struct btrfs_fs_devices {
* - When the BTRFS_FEATURE_INCOMPAT_METADATA_UUID flag is set:
* fs_devices->fsid == sb->fsid
* fs_devices->metadata_uuid == sb->metadata_uuid
*
* - When in-memory fs_devices->temp_fsid is true
* fs_devices->fsid = random
* fs_devices->metadata_uuid == sb->fsid
*/
u8 metadata_uuid[BTRFS_FSID_SIZE];