NFS: support large reads and writes on the wire

 Most NFS server implementations allow up to 64KB reads and writes on the
 wire.  The Solaris NFS server allows up to a megabyte, for instance.

 Now the Linux NFS client supports transfer sizes up to 1MB, too.  This will
 help reduce protocol and context switch overhead on read/write intensive NFS
 workloads, and support larger atomic read and write operations on servers
 that support them.

 Test-plan:
 Connectathon and iozone on mount point with wsize=rsize>32768 over TCP.
 Tests with NFS over UDP to verify the maximum RPC payload size cap.

 Signed-off-by: Chuck Lever <cel@netapp.com>
 Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

1 files changed, 3 insertions, 3 deletions

diff --git a/fs/nfs/read.c b/fs/nfs/read.c
index 21486242c3d3..05eb43fadf8e 100644
--- a/fs/nfs/read.c
+++ b/fs/nfs/read.c
@@ -83,7 +83,7 @@ static int nfs_readpage_sync(struct nfs_open_context *ctx, struct inode *inode,
         int             result;
         struct nfs_read_data *rdata;
 
-        rdata = nfs_readdata_alloc();
+        rdata = nfs_readdata_alloc(1);
         if (!rdata)
                 return -ENOMEM;
 
@@ -283,7 +283,7 @@ static int nfs_pagein_multi(struct list_head *head, struct inode *inode)
 
         nbytes = req->wb_bytes;
         for(;;) {
-                data = nfs_readdata_alloc();
+                data = nfs_readdata_alloc(1);
                 if (!data)
                         goto out_bad;
                 INIT_LIST_HEAD(&data->pages);
@@ -339,7 +339,7 @@ static int nfs_pagein_one(struct list_head *head, struct inode *inode)
         if (NFS_SERVER(inode)->rsize < PAGE_CACHE_SIZE)
                 return nfs_pagein_multi(head, inode);
 
-        data = nfs_readdata_alloc();
+        data = nfs_readdata_alloc(NFS_SERVER(inode)->rpages);
         if (!data)
                 goto out_bad;