Btrfs: check the return value of io_ctl_init()

It can return -ENOMEM.

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
(cherry picked from commit 706efc6630c2722602541a6a2fc5900a4e38456a)

diff --git a/fs/btrfs/free-space-cache.c b/fs/btrfs/free-space-cache.c
index dfaf62caf75ce588f0853f5069ffa901d1063d2d..3ed064e7306b2ab6e83e255f666a4765e5a93af8 100644 (file)
--- a/fs/btrfs/free-space-cache.c
+++ b/fs/btrfs/free-space-cache.c
@@ -637,7 +637,10 @@ int __load_free_space_cache(struct btrfs_root *root, struct inode *inode,
        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 @@ int __btrfs_write_out_cache(struct btrfs_root *root, struct inode *inode,
        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))