NFS: Use cached page as buffer for NFS symlink requests

Now that we have a copy of the symlink path in the page cache, we can pass
a struct page down to the XDR routines instead of a string buffer.

Test plan:
Connectathon, all NFS versions.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

1 files changed, 5 insertions, 2 deletions

diff --git a/fs/nfs/nfs3xdr.c b/fs/nfs/nfs3xdr.c
index 0250269e9753..16556fa4effb 100644
--- a/fs/nfs/nfs3xdr.c
+++ b/fs/nfs/nfs3xdr.c
@@ -56,7 +56,7 @@
 #define NFS3_writeargs_sz       (NFS3_fh_sz+5)
 #define NFS3_createargs_sz      (NFS3_diropargs_sz+NFS3_sattr_sz)
 #define NFS3_mkdirargs_sz       (NFS3_diropargs_sz+NFS3_sattr_sz)
-#define NFS3_symlinkargs_sz     (NFS3_diropargs_sz+NFS3_path_sz+NFS3_sattr_sz)
+#define NFS3_symlinkargs_sz     (NFS3_diropargs_sz+1+NFS3_sattr_sz)
 #define NFS3_mknodargs_sz       (NFS3_diropargs_sz+2+NFS3_sattr_sz)
 #define NFS3_renameargs_sz      (NFS3_diropargs_sz+NFS3_diropargs_sz)
 #define NFS3_linkargs_sz                (NFS3_fh_sz+NFS3_diropargs_sz)
@@ -398,8 +398,11 @@ nfs3_xdr_symlinkargs(struct rpc_rqst *req, u32 *p, struct nfs3_symlinkargs *args
         p = xdr_encode_fhandle(p, args->fromfh);
         p = xdr_encode_array(p, args->fromname, args->fromlen);
         p = xdr_encode_sattr(p, args->sattr);
-        p = xdr_encode_array(p, args->topath, args->tolen);
+        *p++ = htonl(args->pathlen);
         req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
+
+        /* Copy the page */
+        xdr_encode_pages(&req->rq_snd_buf, args->pages, 0, args->pathlen);
         return 0;
 }