diff options
| -rw-r--r-- | fs/btrfs/volumes.h | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/fs/btrfs/volumes.h b/fs/btrfs/volumes.h index 2128a032c3b7..576bfcb5b764 100644 --- a/fs/btrfs/volumes.h +++ b/fs/btrfs/volumes.h @@ -290,6 +290,15 @@ struct btrfs_fs_devices { * - Following shall be true at all times: * - metadata_uuid == btrfs_header::fsid * - metadata_uuid == btrfs_dev_item::fsid + * + * - Relations between fsid and metadata_uuid in sb and fs_devices: + * - Normal: + * fs_devices->fsid == fs_devices->metadata_uuid == sb->fsid + * sb->metadata_uuid == 0 + * + * - When the BTRFS_FEATURE_INCOMPAT_METADATA_UUID flag is set: + * fs_devices->fsid == sb->fsid + * fs_devices->metadata_uuid == sb->metadata_uuid */ u8 metadata_uuid[BTRFS_FSID_SIZE]; |