Btrfs: check the return value of io_ctl_init()
It can return -ENOMEM.
Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
diff --git a/fs/btrfs/free-space-cache.c b/fs/btrfs/free-space-cache.c
index 4e55af3..e4eb222 100644
--- a/fs/btrfs/free-space-cache.c
+++ b/fs/btrfs/free-space-cache.c
@@ -637,7 +637,10 @@
if (!num_entries)
return 0;
- io_ctl_init(&io_ctl, inode, root);
+ ret = io_ctl_init(&io_ctl, inode, root);
+ if (ret)
+ return ret;
+
ret = readahead_cache(inode);
if (ret)
goto out;
@@ -851,7 +854,9 @@
if (!i_size_read(inode))
return -1;
- io_ctl_init(&io_ctl, inode, root);
+ ret = io_ctl_init(&io_ctl, inode, root);
+ if (ret)
+ return -1;
/* Get the cluster for this block_group if it exists */
if (block_group && !list_empty(&block_group->cluster_list))