linux-kernel - Re: ftruncate-mmap: pages are lost after writing to mmaped file.

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Message-ID: <873ad2znit.fsf@devron.myhome.or.jp>
Date:	Wed, 25 Mar 2009 05:14:34 +0900
From:	OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
To:	Jan Kara <jack@...e.cz>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Nick Piggin <nickpiggin@...oo.com.au>,
	"Martin J. Bligh" <mbligh@...igh.org>, linux-ext4@...r.kernel.org,
	Ying Han <yinghan@...gle.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>, guichaz@...il.com,
	Alex Khesin <alexk@...gle.com>,
	Mike Waychison <mikew@...gle.com>,
	Rohit Seth <rohitseth@...gle.com>
Subject: Re: ftruncate-mmap: pages are lost after writing to mmaped file.

Jan Kara <jack@...e.cz> writes:

>   BTW: Note that there's a plenty of filesystems that don't implement
> mkwrite() (e.g. ext2, UDF, VFAT...) and thus have the same problem with
> ENOSPC. So I'd not speak too much about consistency ;).

FWIW, fatfs doesn't allow sparse file (mmap the non-allocated region),
so I guess there is no problem.
-- 
OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
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