GIT: unionfs2-2.6.27.y: Unionfs: clear partial read in readpage

[Erez Zadok]

commit 1370aecac49ee8bb19da6b807fc6308c44d47774
Author: Erez Zadok <ezk at cs.sunysb.edu>
Date:   Fri Nov 9 10:27:32 2007 -0500

    Unionfs: clear partial read in readpage
    
    Signed-off-by: Hugh Dickins <hugh at veritas.com>
    Signed-off-by: Erez Zadok <ezk at cs.sunysb.edu>

diff --git a/fs/unionfs/mmap.c b/fs/unionfs/mmap.c
index 468dc61..bb00fd5 100644
--- a/fs/unionfs/mmap.c
+++ b/fs/unionfs/mmap.c
@@ -178,7 +178,8 @@ static int unionfs_do_readpage(struct file *file, struct page *page)
 	err = vfs_read(lower_file, page_data, PAGE_CACHE_SIZE,
 		       &lower_file->f_pos);
 	set_fs(old_fs);
-
+	if (err >= 0 && err < PAGE_CACHE_SIZE)
+		memset(page_data + err, 0, PAGE_CACHE_SIZE - err);
 	kunmap(page);
 
 	if (err < 0)