btrfs: make btrfs_free_stale_device() to iterate all stales

Let the list iterator iterate further and find other stale
devices and delete it. This is in preparation to add support
for user land request-able stale devices cleanup. Also rename
btrfs_free_stale_device() to btrfs_free_stale_devices().

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

diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index 011bb9b..207014f 100644 (file)
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -605,21 +605,22 @@ static void pending_bios_fn(struct btrfs_work *work)
 }
 
 
-static void btrfs_free_stale_device(struct btrfs_device *cur_dev)
+static void btrfs_free_stale_devices(struct btrfs_device *cur_dev)
 {
-       struct btrfs_fs_devices *fs_devs;
-       struct btrfs_device *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(fs_devs, &fs_uuids, list) {
-               int del = 1;
+       list_for_each_entry_safe(fs_devs, tmp_fs_devs, &fs_uuids, list) {
 
                if (fs_devs->opened)
                        continue;
 
-               list_for_each_entry(dev, &fs_devs->devices, dev_list) {
+               list_for_each_entry_safe(dev, tmp_dev,
+                                        &fs_devs->devices, dev_list) {
+                       int not_found;
 
                        if (dev == cur_dev)
                                continue;
@@ -633,14 +634,12 @@ static void btrfs_free_stale_device(struct btrfs_device *cur_dev)
                         * either use mapper or non mapper path throughout.
                         */
                        rcu_read_lock();
-                       del = strcmp(rcu_str_deref(dev->name),
+                       not_found = strcmp(rcu_str_deref(dev->name),
                                                rcu_str_deref(cur_dev->name));
                        rcu_read_unlock();
-                       if (!del)
-                               break;
-               }
+                       if (not_found)
+                               continue;
 
-               if (!del) {
                        /* delete the stale device */
                        if (fs_devs->num_devices == 1) {
                                btrfs_sysfs_remove_fsid(fs_devs);
@@ -651,7 +650,6 @@ static void btrfs_free_stale_device(struct btrfs_device *cur_dev)
                                list_del(&dev->dev_list);
                                free_device(dev);
                        }
-                       break;
                }
        }
 }
@@ -779,7 +777,7 @@ static noinline int device_list_add(const char *path,
 
                ret = 1;
                device->fs_devices = fs_devices;
-               btrfs_free_stale_device(device);
+               btrfs_free_stale_devices(device);
        } else if (!device->name || strcmp(device->name->str, path)) {
                /*
                 * When FS is already mounted.