nfs: fix pnfs direct write memory leak

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@primarydata.com>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/fs/nfs/direct.c b/fs/nfs/direct.c
index 0bd7a55a5f073befd4d0ce97e87cca2dd0d42e37..725e87538c98ad71ae5f28ded813d9e61fb8a6d1 100644 (file)
--- a/fs/nfs/direct.c
+++ b/fs/nfs/direct.c
@@ -180,6 +180,7 @@ 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)
                nfs_put_lock_context(dreq->l_ctx);
        if (dreq->ctx != NULL)

diff --git a/include/linux/nfs_xdr.h b/include/linux/nfs_xdr.h
index 104b62f23ee025a51d730228e061ea49ce4513e0..54e351aa4d2e5652c03711ec70e416b71d7ee3a5 100644 (file)
--- a/include/linux/nfs_xdr.h
+++ b/include/linux/nfs_xdr.h
@@ -1184,11 +1184,22 @@ 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;