Patch "nfs: fix pnfs direct write memory leak" has been added to the 3.14-stable tree

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This is a note to let you know that I've just added the patch titled

    nfs: fix pnfs direct write memory leak

to the 3.14-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     nfs-fix-pnfs-direct-write-memory-leak.patch
and it can be found in the queue-3.14 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.


>From 8c393f9a721c30a030049a680e1bf896669bb279 Mon Sep 17 00:00:00 2001
From: Peng Tao <tao.peng@xxxxxxxxxxxxxxx>
Date: Wed, 5 Nov 2014 22:36:50 +0800
Subject: nfs: fix pnfs direct write memory leak

From: Peng Tao <tao.peng@xxxxxxxxxxxxxxx>

commit 8c393f9a721c30a030049a680e1bf896669bb279 upstream.

For pNFS direct writes, layout driver may dynamically allocate ds_cinfo.buckets.
So we need to take care to free them when freeing dreq.

Ideally this needs to be done inside layout driver where ds_cinfo.buckets
are allocated. But buckets are attached to dreq and reused across LD IO iterations.
So I feel it's OK to free them in the generic layer.

Signed-off-by: Peng Tao <tao.peng@xxxxxxxxxxxxxxx>
Signed-off-by: Trond Myklebust <trond.myklebust@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 fs/nfs/direct.c         |    1 +
 include/linux/nfs_xdr.h |   11 +++++++++++
 2 files changed, 12 insertions(+)

--- a/fs/nfs/direct.c
+++ b/fs/nfs/direct.c
@@ -178,6 +178,7 @@ static void nfs_direct_req_free(struct k
 {
 	struct nfs_direct_req *dreq = container_of(kref, struct nfs_direct_req, kref);
 
+	nfs_free_pnfs_ds_cinfo(&dreq->ds_cinfo);
 	if (dreq->l_ctx != NULL)
 		nfs_put_lock_context(dreq->l_ctx);
 	if (dreq->ctx != NULL)
--- a/include/linux/nfs_xdr.h
+++ b/include/linux/nfs_xdr.h
@@ -1247,11 +1247,22 @@ struct nfs41_free_stateid_res {
 	unsigned int			status;
 };
 
+static inline void
+nfs_free_pnfs_ds_cinfo(struct pnfs_ds_commit_info *cinfo)
+{
+	kfree(cinfo->buckets);
+}
+
 #else
 
 struct pnfs_ds_commit_info {
 };
 
+static inline void
+nfs_free_pnfs_ds_cinfo(struct pnfs_ds_commit_info *cinfo)
+{
+}
+
 #endif /* CONFIG_NFS_V4_1 */
 
 struct nfs_page;


Patches currently in stable-queue which might be from tao.peng@xxxxxxxxxxxxxxx are

queue-3.14/nfs-fix-pnfs-direct-write-memory-leak.patch
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