btrfs: move commit out of sysfs when changing label
Signed-off-by: David Sterba <dsterba@suse.cz>
diff --git a/fs/btrfs/sysfs.c b/fs/btrfs/sysfs.c
index 226f726..92db3f6 100644
--- a/fs/btrfs/sysfs.c
+++ b/fs/btrfs/sysfs.c
@@ -369,9 +369,6 @@
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 @@
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);