btrfs: return error value if create_io_em failed in cow_file_range

In cow_file_range(), create_io_em() may fail, but its return value is
not recorded.  Then return value may be 0 even it failed which is a
wrong behavior.

Let cow_file_range() return PTR_ERR(em) if create_io_em() failed.

Fixes: 6f9994dbabe5 ("Btrfs: create a helper to create em for IO")
CC: stable@vger.kernel.org # 4.11+
Signed-off-by: Su Yue <suy.fnst@cn.fujitsu.com>
Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

1 files changed, 3 insertions, 1 deletions

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 7148abaf1da3..f81a48c47fe0 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -1018,8 +1018,10 @@ static noinline int cow_file_range(struct inode *inode,
                                   ram_size, /* ram_bytes */
                                   BTRFS_COMPRESS_NONE, /* compress_type */
                                   BTRFS_ORDERED_REGULAR /* type */);
-                if (IS_ERR(em))
+                if (IS_ERR(em)) {
+                        ret = PTR_ERR(em);
                         goto out_reserve;
+                }
                 free_extent_map(em);
 
                 ret = btrfs_add_ordered_extent(inode, start, ins.objectid,