linux-kernel - [PATCH mm] unionfs: clear partial read

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Date:	Fri, 9 Nov 2007 07:31:07 +0000 (GMT)
From:	Hugh Dickins <hugh@...itas.com>
To:	Erez Zadok <ezk@...sunysb.edu>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: [PATCH mm] unionfs: clear partial read

unionfs_do_readpage forgot to clear the rest of the page when vfs_read
does not fill the page: fix that.

Signed-off-by: Hugh Dickins <hugh@...itas.com>
---

 fs/unionfs/mmap.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- 2.6.24-rc1-mm1/fs/unionfs/mmap.c	2007-11-04 13:48:02.000000000 +0000
+++ linux/fs/unionfs/mmap.c	2007-11-06 13:51:02.000000000 +0000
@@ -176,7 +176,8 @@ static int unionfs_do_readpage(struct fi
 	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)
-
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