btrfs: move commit out of sysfs when changing label

Signed-off-by: David Sterba <dsterba@suse.cz>

1 files changed, 8 insertions, 13 deletions

diff --git a/fs/btrfs/sysfs.c b/fs/btrfs/sysfs.c
index 226f7261533a..92db3f648df4 100644
--- a/fs/btrfs/sysfs.c
+++ b/fs/btrfs/sysfs.c
@@ -369,9 +369,6 @@ static ssize_t btrfs_label_store(struct kobject *kobj,
                                  const char *buf, size_t len)
 {
         struct btrfs_fs_info *fs_info = to_fs_info(kobj);
-        struct btrfs_trans_handle *trans;
-        struct btrfs_root *root = fs_info->fs_root;
-        int ret;
         size_t p_len;
 
         if (fs_info->sb->s_flags & MS_RDONLY)
@@ -386,20 +383,18 @@ static ssize_t btrfs_label_store(struct kobject *kobj,
         if (p_len >= BTRFS_LABEL_SIZE)
                 return -EINVAL;
 
-        trans = btrfs_start_transaction(root, 0);
-        if (IS_ERR(trans))
-                return PTR_ERR(trans);
-
-        spin_lock(&root->fs_info->super_lock);
+        spin_lock(&fs_info->super_lock);
         memset(fs_info->super_copy->label, 0, BTRFS_LABEL_SIZE);
         memcpy(fs_info->super_copy->label, buf, p_len);
-        spin_unlock(&root->fs_info->super_lock);
-        ret = btrfs_commit_transaction(trans, root);
+        spin_unlock(&fs_info->super_lock);
 
-        if (!ret)
-                return len;
+        /*
+         * We don't want to do full transaction commit from inside sysfs
+         */
+        btrfs_set_pending(fs_info, COMMIT);
+        wake_up_process(fs_info->transaction_kthread);
 
-        return ret;
+        return len;
 }
 BTRFS_ATTR_RW(label, btrfs_label_show, btrfs_label_store);