linux-kernel - Re: [PATCH 1/1] fs/mpage.c: forgotten WRITE

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Message-ID: <CACZ9PQXNK=z-bk8BJ8rmU9dJiEAcoHBFBoGDK_QoJ0NQFweufQ@mail.gmail.com>
Date:	Fri, 14 Mar 2014 23:23:45 +0900
From:	Roman Peniaev <r.peniaev@...il.com>
To:	Jan Kara <jack@...e.cz>
Cc:	Tejun Heo <tj@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	Jens Axboe <axboe@...nel.dk>
Subject: Re: [PATCH 1/1] fs/mpage.c: forgotten WRITE_SYNC in case of data
 integrity write

On Fri, Mar 14, 2014 at 11:15 PM, Jan Kara <jack@...e.cz> wrote:
> On Fri 14-03-14 10:11:43, Tejun Heo wrote:
>> > Also, could you please help me do understand how can I guarantee
>> > integrity in case of block device with big volatile
>> > cache and filesystem, which does not support REQ_FLUSH/FUA?
>>
>> If a device has a volatile cache but doesn't support flush, it can't
>> guarantee integrity.  There's no way for its user to determine or
>> force whether certain data is on non-volatile media.  It's an
>> inherently broken device.
>   I think his problem was that the device does support REQ_FLUSH/FUA but
> the filesystem on top of it doesn't issue it properly. That's a filesystem
> problem so fix the filesystem... :) Which one is it?

take any old school, e.g. ext2 or even better: fat :)

--
Roman
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