[EXT4 set 9][PATCH 1/5]Morecleanups:ext4-zero_user_page

[Mingming Cao]

Use zero_user_page() in ext4 where possible.


Signed-off-by: Eric Sandeen <[EMAIL PROTECTED]>

Index: linux-2.6.22-rc4-mm2/fs/ext4/inode.c
===================================================================
--- linux-2.6.22-rc4-mm2.orig/fs/ext4/inode.c
+++ linux-2.6.22-rc4-mm2/fs/ext4/inode.c
@@ -1830,7 +1830,6 @@ int ext4_block_truncate_page(handle_t *h
        struct inode *inode = mapping->host;
        struct buffer_head *bh;
        int err = 0;
-       void *kaddr;

        if ((EXT4_I(inode)->i_flags & EXT4_EXTENTS_FL) &&
                        test_opt(inode->i_sb, EXTENTS) &&
@@ -1847,10 +1846,7 @@ int ext4_block_truncate_page(handle_t *h
         */
        if (!page_has_buffers(page) && test_opt(inode->i_sb, NOBH) &&
             ext4_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, KM_USER0);
                set_page_dirty(page);
                goto unlock;
        }
@@ -1903,10 +1899,7 @@ int ext4_block_truncate_page(handle_t *h
                        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, KM_USER0);

        BUFFER_TRACE(bh, "zeroed end of block");



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