linux-kernel - [PATCH 5/6] nfs: Add comment on PG

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Message-Id: <20060825153801.24254.34847.sendpatchset@twins>
Date:	Fri, 25 Aug 2006 17:38:01 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Cc:	Rik van Riel <riel@...hat.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Andrew Morton <akpm@...l.org>,
	Trond Myklebust <trond.myklebust@....uio.no>
Subject: [PATCH 5/6] nfs: Add comment on PG_private use of NFS


Add a comment explaining the use of PG_private in the NFS client.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
---
 fs/nfs/write.c |    5 +++++
 1 file changed, 5 insertions(+)

Index: linux-2.6/fs/nfs/write.c
===================================================================
--- linux-2.6.orig/fs/nfs/write.c
+++ linux-2.6/fs/nfs/write.c
@@ -424,6 +424,11 @@ static int nfs_inode_add_request(struct 
 		if (nfs_have_delegation(inode, FMODE_WRITE))
 			nfsi->change_attr++;
 	}
+	/*
+	 * The PG_private bit is unfortunately needed if we want to fix the
+	 * hole in the mmap semantics. If we do not set it, then the VM will
+	 * fail to call the "releasepage" address ops.
+	 */
 	SetPagePrivate(req->wb_page);
 	nfsi->npages++;
 	atomic_inc(&req->wb_count);
-
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