linux-ext4 - Re: [PATCHSET v3.1 0/7] data integrity: Stabilize pages during writeback for various fses

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Date:	Tue, 10 May 2011 22:52:10 +0900
From:	OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	"Darrick J. Wong" <djwong@...ibm.com>,
	Theodore Tso <tytso@....edu>, Jan Kara <jack@...e.cz>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Jens Axboe <axboe@...nel.dk>,
	"Martin K. Petersen" <martin.petersen@...cle.com>,
	Jeff Layton <jlayton@...hat.com>,
	Dave Chinner <david@...morbit.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Dave Hansen <dave@...ux.vnet.ibm.com>, linux-mm@...ck.org,
	Chris Mason <chris.mason@...cle.com>,
	Joel Becker <jlbec@...lplan.org>,
	linux-scsi <linux-scsi@...r.kernel.org>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	linux-ext4@...r.kernel.org, Mingming Cao <mcao@...ibm.com>
Subject: Re: [PATCHSET v3.1 0/7] data integrity: Stabilize pages during writeback for various fses

Christoph Hellwig <hch@...radead.org> writes:

> On Tue, May 10, 2011 at 10:59:15AM +0900, OGAWA Hirofumi wrote:
>> I'd like to know those patches are on what state. Waiting in writeback
>> page makes slower, like you mentioned it (I guess it would more
>> noticeable if device was slower that like FAT uses). And I think
>> currently it doesn't help anything others for blk-integrity stuff
>> (without other technic, it doesn't help FS consistency)?
>
> It only makes things slower if we rewrite a region in a file that is
> currently undergoing writeback. I'd be interested to know about real
> life applications doing that, and if they really are badly affect we
> should help them to work around that in userspace, e.g. by adding a
> fadvice will rewrite call that might be used to never write back that
> regions without an explicit fsync call.

Isn't it reallocated blocks too, and metadata too?

Thanks.
-- 
OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
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