[3.16.y-ckt stable] Patch "ceph: fix message length computation" has been added to staging queue

[Luis Henriques]

This is a note to let you know that I have just added a patch titled

    ceph: fix message length computation

to the linux-3.16.y-queue branch of the 3.16.y-ckt extended stable tree 
which can be found at:

    http://kernel.ubuntu.com/git/ubuntu/linux.git/log/?h=linux-3.16.y-queue

This patch is scheduled to be released in version 3.16.7-ckt21.

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.16.y-ckt tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Luis

------

>From c476959169b99aab2804c8544a0032305b895bb9 Mon Sep 17 00:00:00 2001
From: Arnd Bergmann <arnd at arndb.de>
Date: Wed, 30 Sep 2015 15:04:42 +0200
Subject: ceph: fix message length computation

commit 777d738a5e58ba3b6f3932ab1543ce93703f4873 upstream.

create_request_message() computes the maximum length of a message,
but uses the wrong type for the time stamp: sizeof(struct timespec)
may be 8 or 16 depending on the architecture, while sizeof(struct
ceph_timespec) is always 8, and that is what gets put into the
message.

Found while auditing the uses of timespec for y2038 problems.

Fixes: b8e69066d8af ("ceph: include time stamp in every MDS request")
Signed-off-by: Arnd Bergmann <arnd at arndb.de>
Signed-off-by: Yan, Zheng <zyan at redhat.com>
Signed-off-by: Luis Henriques <luis.henriques at canonical.com>
---
 fs/ceph/mds_client.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/ceph/mds_client.c b/fs/ceph/mds_client.c
index 92a2548278fc..63f2bc82f4af 100644
--- a/fs/ceph/mds_client.c
+++ b/fs/ceph/mds_client.c
@@ -1786,7 +1786,7 @@ static struct ceph_msg *create_request_message(struct ceph_mds_client *mdsc,

 	len = sizeof(*head) +
 		pathlen1 + pathlen2 + 2*(1 + sizeof(u32) + sizeof(u64)) +
-		sizeof(struct timespec);
+		sizeof(struct ceph_timespec);

 	/* calculate (max) length for cap releases */
 	len += sizeof(struct ceph_mds_request_release) *