ceph: Don't forget the 'up_read(&osdc->map_sem)' if met error.

CC: stable@vger.kernel.org
Signed-off-by: Jianpeng Ma <majianpeng@gmail.com>
Reviewed-by: Sage Weil <sage@inktank.com>

1 files changed, 3 insertions, 1 deletions

diff --git a/fs/ceph/ioctl.c b/fs/ceph/ioctl.c
index e0b4ef31d3c8..a5ce62eb7806 100644
--- a/fs/ceph/ioctl.c
+++ b/fs/ceph/ioctl.c
@@ -196,8 +196,10 @@ static long ceph_ioctl_get_dataloc(struct file *file, void __user *arg)
         r = ceph_calc_file_object_mapping(&ci->i_layout, dl.file_offset, len,
                                           &dl.object_no, &dl.object_offset,
                                           &olen);
-        if (r < 0)
+        if (r < 0) {
+                up_read(&osdc->map_sem);
                 return -EIO;
+        }
         dl.file_offset -= dl.object_offset;
         dl.object_size = ceph_file_layout_object_size(ci->i_layout);
         dl.block_size = ceph_file_layout_su(ci->i_layout);