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btrfs: add comment about metadata_uuid in btrfs_fs_devices

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Add comment about metadata_uuid in btrfs_fs_devices.
No functional change.

Signed-off-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Anand Jain 2023-05-24 20:02:38 +08:00 committed by David Sterba
parent c6930d7d11
commit f62c302e6d
1 changed files with 12 additions and 0 deletions
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12
fs/btrfs/volumes.h
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@ -280,7 +280,19 @@ enum btrfs_read_policy {
struct btrfs_fs_devices {
u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
/*
* UUID written into the btree blocks:
*
* - If metadata_uuid != fsid then super block must have
* BTRFS_FEATURE_INCOMPAT_METADATA_UUID flag set.
*
* - Following shall be true at all times:
* - metadata_uuid == btrfs_header::fsid
* - metadata_uuid == btrfs_dev_item::fsid
*/
u8 metadata_uuid[BTRFS_FSID_SIZE];
struct list_head fs_list;
/*