[PATCH 3.13.y-ckt 074/121] nfs: fix pnfs direct write memory leak

From: Kamal Mostafa
Date: Tue Dec 02 2014 - 14:39:12 EST

3.13.11-ckt12 -stable review patch. If anyone has any objections, please let me know.


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: Kamal Mostafa <kamal@xxxxxxxxxxxxx>
fs/nfs/direct.c | 1 +
include/linux/nfs_xdr.h | 11 +++++++++++
2 files changed, 12 insertions(+)

diff --git a/fs/nfs/direct.c b/fs/nfs/direct.c
index d71d66c..a74e888 100644
--- a/fs/nfs/direct.c
+++ b/fs/nfs/direct.c
@@ -178,6 +178,7 @@ static void nfs_direct_req_free(struct kref *kref)
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)
if (dreq->ctx != NULL)
diff --git a/include/linux/nfs_xdr.h b/include/linux/nfs_xdr.h
index 5624e4e..53988cb 100644
--- 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);

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;

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