linux-ext4 - Re: [PATCH 07/17] vfs: Introduce new helpers for syncing after writing to O_SYNC file or IS

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20090826182236.GA1290@infradead.org>
Date:	Wed, 26 Aug 2009 14:22:36 -0400
From:	Christoph Hellwig <hch@...radead.org>
To:	Jan Kara <jack@...e.cz>
Cc:	Christoph Hellwig <hch@...radead.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Evgeniy Polyakov <zbr@...emap.net>, ocfs2-devel@....oracle.com,
	Joel Becker <joel.becker@...cle.com>,
	Felix Blyakher <felixb@....com>, xfs@....sgi.com,
	Anton Altaparmakov <aia21@...tab.net>,
	linux-ntfs-dev@...ts.sourceforge.net,
	OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>,
	linux-ext4@...r.kernel.org, tytso@....edu
Subject: Re: [PATCH 07/17] vfs: Introduce new helpers for syncing after
	writing to O_SYNC file or IS_SYNC inode

On Thu, Aug 20, 2009 at 12:27:29PM -0400, Christoph Hellwig wrote:
> Maybe you can help brain storming, but I still can't see any way in that
> the
> 
>   - write data
>   - write inode
>   - wait for data
> 
> actually is a benefit in terms of semantics (I agree that it could be
> faster in theory, but even that is debatable with todays seek latencies
> in disks)

Btw, another reason why our current default is actively harmful:

	barriers

With volatile write caches we do have to flush the disk write cache in
->fsync, either implicitly by a metadata operation, or explicitly if
only data changed.  Unless the filesystems waits itself for the data
to hit the disk like XFS or btrfs will be issue the cache flush
potentially before the data write has actually reached the disk cache.
--
To unsubscribe from this list: send the line "unsubscribe linux-ext4" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html