[PATCH 4.9 28/63] ceph: remove req from unsafe list when unregistering it

From: Greg Kroah-Hartman
Date: Mon Mar 13 2017 - 05:13:55 EST


4.9-stable review patch. If anyone has any objections, please let me know.

------------------

From: Jeff Layton <jlayton@xxxxxxxxxx>

commit df963ea8a082d31521a120e8e31a29ad8a1dc215 upstream.

There's no reason a request should ever be on a s_unsafe list but not
in the request tree.

Link: http://tracker.ceph.com/issues/18474
Signed-off-by: Jeff Layton <jlayton@xxxxxxxxxx>
Reviewed-by: Yan, Zheng <zyan@xxxxxxxxxx>
Signed-off-by: Ilya Dryomov <idryomov@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
fs/ceph/mds_client.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)

--- a/fs/ceph/mds_client.c
+++ b/fs/ceph/mds_client.c
@@ -628,6 +628,9 @@ static void __unregister_request(struct
{
dout("__unregister_request %p tid %lld\n", req, req->r_tid);

+ /* Never leave an unregistered request on an unsafe list! */
+ list_del_init(&req->r_unsafe_item);
+
if (req->r_tid == mdsc->oldest_tid) {
struct rb_node *p = rb_next(&req->r_node);
mdsc->oldest_tid = 0;
@@ -1036,7 +1039,6 @@ static void cleanup_session_requests(str
while (!list_empty(&session->s_unsafe)) {
req = list_first_entry(&session->s_unsafe,
struct ceph_mds_request, r_unsafe_item);
- list_del_init(&req->r_unsafe_item);
pr_warn_ratelimited(" dropping unsafe request %llu\n",
req->r_tid);
__unregister_request(mdsc, req);
@@ -2423,7 +2425,6 @@ static void handle_reply(struct ceph_mds
* useful we could do with a revised return value.
*/
dout("got safe reply %llu, mds%d\n", tid, mds);
- list_del_init(&req->r_unsafe_item);

/* last unsafe request during umount? */
if (mdsc->stopping && !__get_oldest_req(mdsc))