From 57bf63d69cb6b7064e6fec5e83da4e1918168282 Mon Sep 17 00:00:00 2001
From: Dave Kleikamp <shaggy@linux.vnet.ibm.com>
Date: Tue, 6 Mar 2007 01:42:12 -0800
Subject: [PATCH] [PATCH] fs: nobh_truncate_page() fix

This fixes a regression caused by 22c8ca78f20724676b6006232bf06cc3e9299539.

nobh_prepare_write() no longer marks the page uptodate, so
nobh_truncate_page() needs to do it.

Signed-off-by: Dave Kleikamp <shaggy@linux.vnet.ibm.com>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
 fs/buffer.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/fs/buffer.c b/fs/buffer.c
index e8504b65176c..1d0852fa728b 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -2365,6 +2365,10 @@ failed:
 }
 EXPORT_SYMBOL(nobh_prepare_write);
 
+/*
+ * Make sure any changes to nobh_commit_write() are reflected in
+ * nobh_truncate_page(), since it doesn't call commit_write().
+ */
 int nobh_commit_write(struct file *file, struct page *page,
 		unsigned from, unsigned to)
 {
@@ -2466,6 +2470,11 @@ int nobh_truncate_page(struct address_space *mapping, loff_t from)
 		memset(kaddr + offset, 0, PAGE_CACHE_SIZE - offset);
 		flush_dcache_page(page);
 		kunmap_atomic(kaddr, KM_USER0);
+		/*
+		 * It would be more correct to call aops->commit_write()
+		 * here, but this is more efficient.
+		 */
+		SetPageUptodate(page);
 		set_page_dirty(page);
 	}
 	unlock_page(page);