Btrfs: use the device_list_mutex during write_dev_supers

[deliverable/linux.git] / fs / btrfs / disk-io.c

diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index b2588a552658d28118fd8d885d8595d1ec1f4303..98b6a71decba105616ef5727b07b18c6d79dd8e0 100644 (file)
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -2310,7 +2310,7 @@ int write_all_supers(struct btrfs_root *root, int max_mirrors)
        sb = &root->fs_info->super_for_commit;
        dev_item = &sb->dev_item;
 
-       rcu_read_lock();
+       mutex_lock(&root->fs_info->fs_devices->device_list_mutex);
        head = &root->fs_info->fs_devices->devices;
        list_for_each_entry_rcu(dev, head, dev_list) {
                if (!dev->bdev) {
@@ -2355,7 +2355,7 @@ int write_all_supers(struct btrfs_root *root, int max_mirrors)
                if (ret)
                        total_errors++;
        }
-       rcu_read_unlock();
+       mutex_unlock(&root->fs_info->fs_devices->device_list_mutex);
        if (total_errors > max_errors) {
                printk(KERN_ERR "btrfs: %d errors while writing supers\n",
                       total_errors);