ceph: fix message revocation
A message can be on a queue (pending or sent), or out_msg (sending), or
both. We were assuming that if it's not on a queue it couldn't be out_msg,
but that was false in the case of lossy connections like the OSD. Fix
ceph_con_revoke() to treat these cases independently. Also, fix the
out_kvec_is_message check to only trigger if we are currently sending
_this_ message.
This fixes a GPF in tcp_sendpage, triggered by OSD restarts.
Signed-off-by: Sage Weil <sage@newdream.net>
diff --git a/fs/ceph/messenger.c b/fs/ceph/messenger.c
index 9ad43a3..9692d08 100644
--- a/fs/ceph/messenger.c
+++ b/fs/ceph/messenger.c
@@ -2015,20 +2015,20 @@
{
mutex_lock(&con->mutex);
if (!list_empty(&msg->list_head)) {
- dout("con_revoke %p msg %p\n", con, msg);
+ dout("con_revoke %p msg %p - was on queue\n", con, msg);
list_del_init(&msg->list_head);
ceph_msg_put(msg);
msg->hdr.seq = 0;
- if (con->out_msg == msg) {
- ceph_msg_put(con->out_msg);
- con->out_msg = NULL;
- }
+ }
+ if (con->out_msg == msg) {
+ dout("con_revoke %p msg %p - was sending\n", con, msg);
+ con->out_msg = NULL;
if (con->out_kvec_is_msg) {
con->out_skip = con->out_kvec_bytes;
con->out_kvec_is_msg = false;
}
- } else {
- dout("con_revoke %p msg %p - not queued (sent?)\n", con, msg);
+ ceph_msg_put(msg);
+ msg->hdr.seq = 0;
}
mutex_unlock(&con->mutex);
}