linux-kernel - [PATCH 5/9] Unionfs: clear partial read in readpage

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Message-Id: <11949486303084-git-send-email-ezk@cs.sunysb.edu>
Date:	Tue, 13 Nov 2007 05:10:24 -0500
From:	Erez Zadok <ezk@...sunysb.edu>
To:	akpm@...ux-foundation.org
Cc:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	viro@....linux.org.uk, hch@...radead.org,
	Erez Zadok <ezk@...sunysb.edu>, Hugh Dickins <hugh@...itas.com>
Subject: [PATCH 5/9] Unionfs: clear partial read in readpage

Signed-off-by: Hugh Dickins <hugh@...itas.com>
Signed-off-by: Erez Zadok <ezk@...sunysb.edu>
---
 fs/unionfs/mmap.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

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)
-- 
1.5.2.2

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