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

commit 494ddd11be3e2621096bb425eed2886f8e8446d4 upstream.

Signed-off-by: Jianpeng Ma <majianpeng@gmail.com>
Reviewed-by: Sage Weil <sage@inktank.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/fs/ceph/ioctl.c b/fs/ceph/ioctl.c
index e0b4ef31d3c870c9e73fecad303e9f9957542385..a5ce62eb7806daf0722d1950f26015a11e67275c 100644 (file)
--- 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);