From: Hugh Dickins <hugh@veritas.com>
To: Erez Zadok <ezk@cs.sunysb.edu>
Cc: Andrew Morton <akpm@linux-foundation.org>, linux-kernel@vger.kernel.org
Subject: [PATCH mm] unionfs: clear partial read
Date: Fri, 9 Nov 2007 07:31:07 +0000 (GMT) [thread overview]
Message-ID: <Pine.LNX.4.64.0711090728130.22720@blonde.wat.veritas.com> (raw)
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@veritas.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)
next reply other threads:[~2007-11-09 7:32 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-11-09 7:31 Hugh Dickins [this message]
2007-11-09 15:26 ` Erez Zadok
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