ceph: fix ceph_get_caps() interruption

Commit 5c341ee32881 ("ceph: fix scheduler warning due to nested
blocking") causes infinite loop when process is interrupted.  Fix it.

Signed-off-by: Yan, Zheng <zyan@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>

diff --git a/fs/ceph/caps.c b/fs/ceph/caps.c
index baea866a6751facf4c1f18dda23e71582978dffe..94fd76d04683d88103b42ff71a02490201a9783f 100644 (file)
--- a/fs/ceph/caps.c
+++ b/fs/ceph/caps.c
@@ -2591,8 +2591,13 @@ int ceph_get_caps(struct ceph_inode_info *ci, int need, int want,
                        add_wait_queue(&ci->i_cap_wq, &wait);
 
                        while (!try_get_cap_refs(ci, need, want, endoff,
-                                                true, &_got, &err))
+                                                true, &_got, &err)) {
+                               if (signal_pending(current)) {
+                                       ret = -ERESTARTSYS;
+                                       break;
+                               }
                                wait_woken(&wait, TASK_INTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT);
+                       }
 
                        remove_wait_queue(&ci->i_cap_wq, &wait);