btrfs: disable the seed feature for temp-fsid

A seed device is an integral component of the sprout device, which
functions as a multi-device filesystem. Therefore, temp-fsid feature
is not supported.

Signed-off-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index 81b735f4efc1a41e6f28d5cb2e8ffe8612e90f8c..1fdfa9153e30c55d6813a50b7c8e3ff5d74be887 100644 (file)
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -571,6 +571,14 @@ static struct btrfs_fs_devices *find_fsid_by_device(
        if (btrfs_super_num_devices(disk_super) != 1)
                return fsid_fs_devices;
 
+       /*
+        * A seed device is an integral component of the sprout device, which
+        * functions as a multi-device filesystem. So, temp-fsid feature is
+        * not supported.
+        */
+       if (btrfs_super_flags(disk_super) & BTRFS_SUPER_FLAG_SEEDING)
+               return fsid_fs_devices;
+
        /* Try to find a fs_devices by matching devt. */
        list_for_each_entry(devt_fs_devices, &fs_uuids, fs_list) {
                struct btrfs_device *device;