[PATCH] ceph: Add check returned value on func ceph_calc_ceph_pg.

[majianpeng]

Func ceph_calc_ceph_pg maybe failed.So add check for returned value.

Signed-off-by: Jianpeng Ma <majianp...@gmail.com>
---
 fs/ceph/ioctl.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/fs/ceph/ioctl.c b/fs/ceph/ioctl.c
index e0b4ef3..8c463dd 100644
--- a/fs/ceph/ioctl.c
+++ b/fs/ceph/ioctl.c
@@ -209,8 +209,12 @@ static long ceph_ioctl_get_dataloc(struct file *file, void 
__user *arg)
        snprintf(dl.object_name, sizeof(dl.object_name), "%llx.%08llx",
                 ceph_ino(inode), dl.object_no);
 
-       ceph_calc_ceph_pg(&pgid, dl.object_name, osdc->osdmap,
-               ceph_file_layout_pg_pool(ci->i_layout));
+       r = ceph_calc_ceph_pg(&pgid, dl.object_name, osdc->osdmap,
+                               ceph_file_layout_pg_pool(ci->i_layout));
+       if (r < 0) {
+               up_read(&osdc->map_sem);
+               return r;
+       }
 
        dl.osd = ceph_calc_pg_primary(osdc->osdmap, pgid);
        if (dl.osd >= 0) {
-- 
1.8.1.2


Thanks!
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