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

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Message-ID: <20110510161836.GL4402@quack.suse.cz>
Date:	Tue, 10 May 2011 18:18:36 +0200
From:	Jan Kara <jack@...e.cz>
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 11-05-11 00:24:58, OGAWA Hirofumi wrote:
> Jan Kara <jack@...e.cz> writes:
> 
> >> Isn't it reallocated blocks too, and metadata too?
> >   Reallocated blocks - not really. For a block to be freed it cannot be
> > under writeback and when it's freed no writeback is started.
> 
> Sure for data -> data reallocated case. metadata -> data/metadata is
> still there.
  Unless you properly use bforget() (which you should I think). But I have
not really checked this in detail for a while.

								Honza
-- 
Jan Kara <jack@...e.cz>
SUSE Labs, CR
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