[PATCH 4/13] ext3: use zero_user_page

[Nate Diller <nate.diller@gmail.com>]

Use zero_user_page() instead of open-coding it. 

Signed-off-by: Nate Diller <nate.diller@gmail.com>

--- 

diff -urpN -X dontdiff linux-2.6.21-rc6-mm1/fs/ext3/inode.c linux-2.6.21-rc6-mm1-test/fs/ext3/inode.c
--- linux-2.6.21-rc6-mm1/fs/ext3/inode.c	2007-04-09 17:24:03.000000000 -0700
+++ linux-2.6.21-rc6-mm1-test/fs/ext3/inode.c	2007-04-09 18:18:23.000000000 -0700
@@ -1767,7 +1767,6 @@ static int ext3_block_truncate_page(hand
 	struct inode *inode = mapping->host;
 	struct buffer_head *bh;
 	int err = 0;
-	void *kaddr;
 
 	blocksize = inode->i_sb->s_blocksize;
 	length = blocksize - (offset & (blocksize - 1));
@@ -1779,10 +1778,7 @@ static int ext3_block_truncate_page(hand
 	 */
 	if (!page_has_buffers(page) && test_opt(inode->i_sb, NOBH) &&
 	     ext3_should_writeback_data(inode) && PageUptodate(page)) {
-		kaddr = kmap_atomic(page, KM_USER0);
-		memset(kaddr + offset, 0, length);
-		flush_dcache_page(page);
-		kunmap_atomic(kaddr, KM_USER0);
+		zero_user_page(page, offset, length);
 		set_page_dirty(page);
 		goto unlock;
 	}
@@ -1835,11 +1831,7 @@ static int ext3_block_truncate_page(hand
 			goto unlock;
 	}
 
-	kaddr = kmap_atomic(page, KM_USER0);
-	memset(kaddr + offset, 0, length);
-	flush_dcache_page(page);
-	kunmap_atomic(kaddr, KM_USER0);
-
+	zero_user_page(page, offset, length);
 	BUFFER_TRACE(bh, "zeroed end of block");
 
 	err = 0;