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Message-Id: <20140915192644.914183820@linuxfoundation.org>
Date: Mon, 15 Sep 2014 12:26:52 -0700
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org, Sage Weil <sage@...hat.com>,
Ilya Dryomov <ilya.dryomov@...tank.com>
Subject: [PATCH 3.14 112/114] libceph: gracefully handle large reply messages from the mon
3.14-stable review patch. If anyone has any objections, please let me know.
------------------
From: Sage Weil <sage@...hat.com>
commit 73c3d4812b4c755efeca0140f606f83772a39ce4 upstream.
We preallocate a few of the message types we get back from the mon. If we
get a larger message than we are expecting, fall back to trying to allocate
a new one instead of blindly using the one we have.
Signed-off-by: Sage Weil <sage@...hat.com>
Reviewed-by: Ilya Dryomov <ilya.dryomov@...tank.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
net/ceph/mon_client.c | 8 ++++++++
1 file changed, 8 insertions(+)
--- a/net/ceph/mon_client.c
+++ b/net/ceph/mon_client.c
@@ -1041,7 +1041,15 @@ static struct ceph_msg *mon_alloc_msg(st
if (!m) {
pr_info("alloc_msg unknown type %d\n", type);
*skip = 1;
+ } else if (front_len > m->front_alloc_len) {
+ pr_warning("mon_alloc_msg front %d > prealloc %d (%u#%llu)\n",
+ front_len, m->front_alloc_len,
+ (unsigned int)con->peer_name.type,
+ le64_to_cpu(con->peer_name.num));
+ ceph_msg_put(m);
+ m = ceph_msg_new(type, front_len, GFP_NOFS, false);
}
+
return m;
}
--
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