linux-ext4 - Re: [PATCH 2/2] ext2: Add blk_issue

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Message-ID: <20090114174023.GK19950@duck.suse.cz>
Date:	Wed, 14 Jan 2009 18:40:23 +0100
From:	Jan Kara <jack@...e.cz>
To:	Eric Sandeen <sandeen@...hat.com>
Cc:	linux-ext4@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, pavel@...e.cz
Subject: Re: [PATCH 2/2] ext2: Add blk_issue_flush() to syncing paths

On Wed 14-01-09 11:35:50, Eric Sandeen wrote:
> Jan Kara wrote:
> > To be really safe that the data hit the platter, we should also flush drive's
> > writeback caches on fsync and for O_SYNC files or O_DIRSYNC inodes.
> 
> Seems sane, but aren't we getting really divergent behavior here between
> ext2, ext3, and ext4 w.r.t. drive cache flushing for sync paths?
  Well, but ext3/4 should do a barrier on a transaction commit (if the user
really cares about data integrity) and hence it implicitely does the same.

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