Subject: [PATCH 30/33] nfs: swap vs nfs_writepage

From: Peter Zijlstra <[email-masked]>
Date: Tue, 30 Oct 2007 17:04:31 +0100

For now just use the ->writepage() path for swap traffic. Trond would like
to see ->swap_page() or some such additional a_op.

Signed-off-by: Peter Zijlstra <[email-masked]>
---
 fs/nfs/write.c |   23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

Index: linux-2.6/fs/nfs/write.c
===================================================================
--- linux-2.6.orig/fs/nfs/write.c
+++ linux-2.6/fs/nfs/write.c
@@ -336,6 +336,29 @@ static int nfs_do_writepage(struct page 
 	nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGE);
 	nfs_add_stats(inode, NFSIOS_WRITEPAGES, 1);
 
+	if (unlikely(IS_SWAPFILE(inode))) {
+		struct rpc_cred *cred;
+		struct nfs_open_context *ctx;
+		int status;
+
+		cred = rpcauth_lookupcred(NFS_CLIENT(inode)->cl_auth, 0);
+		if (IS_ERR(cred))
+			return PTR_ERR(cred);
+
+		ctx = nfs_find_open_context(inode, cred, FMODE_WRITE);
+		if (!ctx)
+			return -EBADF;
+
+		status = nfs_writepage_setup(ctx, page, 0, nfs_page_length(page));
+
+		put_nfs_open_context(ctx);
+
+		if (status < 0) {
+			nfs_set_pageerror(page);
+			return status;
+		}
+	}
+
 	nfs_pageio_cond_complete(pgio, page->index);
 	return nfs_page_async_flush(pgio, page);
 }

--