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

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Message-ID: <20110510170339.GA27538@infradead.org>
Date:	Tue, 10 May 2011 13:03:39 -0400
From:	Christoph Hellwig <hch@...radead.org>
To:	OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
Cc:	Jan Kara <jack@...e.cz>, Christoph Hellwig <hch@...radead.org>,
	"Darrick J. Wong" <djwong@...ibm.com>,
	Theodore Tso <tytso@....edu>,
	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

On Wed, May 11, 2011 at 12:24:58AM +0900, OGAWA Hirofumi wrote:
> > under writeback and when it's freed no writeback is started.
> 
> Sure for data -> data reallocated case. metadata -> data/metadata is
> still there.

That's usually handled differently.  For XFS take a look at the
xfs_alloc_busy_* function.  For 2.6.40 they've been mostly rewritten
to rarely wait for the reuse but instead avoid busy blocks.  But that's
a real data integrity issue even without stable pages for I/O.

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