Btrfs: introduce btrfs_get_fs_uuids to get fs_uuids

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

fs/btrfs/volumes.c

diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index 39ff99e..e500bfa 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -52,6 +52,10 @@
 
 DEFINE_MUTEX(uuid_mutex);
 static LIST_HEAD(fs_uuids);
+struct list_head *btrfs_get_fs_uuids(void)
+{
+	return &fs_uuids;
+}
 
 static struct btrfs_fs_devices *__alloc_fs_devices(void)
 {

fs/btrfs/volumes.h

diff --git a/fs/btrfs/volumes.h b/fs/btrfs/volumes.h
index e9780e9..ac7e938 100644
--- a/fs/btrfs/volumes.h
+++ b/fs/btrfs/volumes.h
@@ -542,5 +542,6 @@
 	mutex_unlock(&root->fs_info->chunk_mutex);
 }
 
+struct list_head *btrfs_get_fs_uuids(void);
 
 #endif