linux-ext4 - Re: [PATCH] ext4: Fix zeroing of page during writeback

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Message-ID: <20140526163759.GL22284@thunk.org>
Date:	Mon, 26 May 2014 12:37:59 -0400
From:	Theodore Ts'o <tytso@....edu>
To:	Jan Kara <jack@...e.cz>
Cc:	linux-ext4@...r.kernel.org,
	Xiaoguang Wang <wangxg.fnst@...fujitsu.com>,
	stable@...r.kernel.org
Subject: Re: [PATCH] ext4: Fix zeroing of page during writeback

On Thu, May 22, 2014 at 05:06:43PM +0200, Jan Kara wrote:
> Tail of a page straddling inode size must be zeroed when being written
> out due to POSIX requirement that modifications of mmaped page beyond
> inode size must not be written to the file. ext4_bio_write_page() did
> this only for blocks fully beyond inode size but didn't properly zero
> blocks partially beyond inode size. Fix this.
> 
> The problem has been uncovered by mmap_11-4 test in openposix test suite
> (part of LTP).
> 
> Reported-by: Xiaoguang Wang <wangxg.fnst@...fujitsu.com>
> Fixes: 5a0dc7365c240
> Fixes: bd2d0210cf22f
> CC: stable@...r.kernel.org
> Signed-off-by: Jan Kara <jack@...e.cz>

Applied, thanks.

					- Ted
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