[2.6.22.y] {15/17} - nfs-unmount-leak.patch - series for stable kernel #2

From: Oliver Pinter (Pintér Olivér)
Date: Fri Feb 01 2008 - 20:38:56 EST


mainline: 13ef7b69b54aa8ae4ed264d0bf41339737f8543a


--
Thanks,
Oliver
From: Trond Myklebust <Trond.Myklebust@xxxxxxxxxx>
Date: Tue Dec 11 11:05:19 2007 -0500
Subject: NFSv2/v3: Fix a memory leak when using -onolock
Patch-mainline: 2.6.24
References: 336253



Neil Brown said:
> Hi Trond,
>
> We found that a machine which made moderately heavy use of
> 'automount' was leaking some nfs data structures - particularly the
> 4K allocated by rpc_alloc_iostats.
> It turns out that this only happens with filesystems with -onolock
> set.

> The problem is that if NFS_MOUNT_NONLM is set, nfs_start_lockd doesn't
> set server->destroy, so when the filesystem is unmounted, the
> ->client_acl is not shutdown, and so several resources are still
> held. Multiple mount/umount cycles will slowly eat away memory
> several pages at a time.

Signed-off-by: Trond Myklebust <Trond.Myklebust@xxxxxxxxxx>

Acked-by: Neil Brown <neilb@xxxxxxx>
Signed-off-by: Neil Brown <neilb@xxxxxxx>

---
fs/nfs/client.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)

--- linux-2.6.22-SL103_BRANCH.orig/fs/nfs/client.c
+++ linux-2.6.22-SL103_BRANCH/fs/nfs/client.c
@@ -433,9 +433,6 @@ static int nfs_create_rpc_client(struct
*/
static void nfs_destroy_server(struct nfs_server *server)
{
- if (!IS_ERR(server->client_acl))
- rpc_shutdown_client(server->client_acl);
-
if (!(server->flags & NFS_MOUNT_NONLM))
lockd_down(); /* release rpc.lockd */
}
@@ -771,6 +768,9 @@ void nfs_free_server(struct nfs_server *

if (server->destroy != NULL)
server->destroy(server);
+
+ if (!IS_ERR(server->client_acl))
+ rpc_shutdown_client(server->client_acl);
if (!IS_ERR(server->client))
rpc_shutdown_client(server->client);