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Subject[PATCH 4/13] ext3: use zero_user_page
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;
-
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