Use zero_user_page() in ext4 where possible

Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

1 files changed, 2 insertions, 9 deletions

diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index f6d8528c4f5..125aca71468 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -1766,7 +1766,6 @@ int ext4_block_truncate_page(handle_t *handle, struct page *page,
         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));
@@ -1778,10 +1777,7 @@ int ext4_block_truncate_page(handle_t *handle, struct page *page,
          */
         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;
         }
@@ -1834,10 +1830,7 @@ int ext4_block_truncate_page(handle_t *handle, struct page *page,
                         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");