btrfs: make btrfs_free_stale_devices() argument optional

This updates btrfs_free_stale_devices() helper function to delete all
unmouted devices, when arg is NULL.

Signed-off-by: Anand Jain <anand.jain@oracle.com>
Reviewed-by: Josef Bacik <jbacik@fb.com>
Signed-off-by: David Sterba <dsterba@suse.com>

1 files changed, 5 insertions, 9 deletions

diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index 207014fce7ea..9712377862d9 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -610,9 +610,6 @@ static void btrfs_free_stale_devices(struct btrfs_device *cur_dev)
         struct btrfs_fs_devices *fs_devs, *tmp_fs_devs;
         struct btrfs_device *dev, *tmp_dev;
 
-        if (!cur_dev->name)
-                return;
-
         list_for_each_entry_safe(fs_devs, tmp_fs_devs, &fs_uuids, list) {
 
                 if (fs_devs->opened)
@@ -620,11 +617,9 @@ static void btrfs_free_stale_devices(struct btrfs_device *cur_dev)
 
                 list_for_each_entry_safe(dev, tmp_dev,
                                          &fs_devs->devices, dev_list) {
-                        int not_found;
+                        int not_found = 0;
 
-                        if (dev == cur_dev)
-                                continue;
-                        if (!dev->name)
+                        if (cur_dev && (cur_dev == dev || !dev->name))
                                 continue;
 
                         /*
@@ -634,8 +629,9 @@ static void btrfs_free_stale_devices(struct btrfs_device *cur_dev)
                          * either use mapper or non mapper path throughout.
                          */
                         rcu_read_lock();
-                        not_found = strcmp(rcu_str_deref(dev->name),
-                                                rcu_str_deref(cur_dev->name));
+                        if (cur_dev)
+                                not_found = strcmp(rcu_str_deref(dev->name),
+                                                   rcu_str_deref(cur_dev->name));
                         rcu_read_unlock();
                         if (not_found)
                                 continue;