linux-kernel - Re: [PATCH 1/1] FS: Add generic data flush to fsync

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Message-ID: <20140411130027.GA15758@quack.suse.cz>
Date:	Fri, 11 Apr 2014 15:00:27 +0200
From:	Jan Kara <jack@...e.cz>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	Fabian Frederick <fabf@...net.be>, Viro <viro@...iv.linux.org.uk>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	jack <jack@...e.cz>, akpm <akpm@...ux-foundation.org>
Subject: Re: [PATCH 1/1] FS: Add generic data flush to fsync

On Fri 11-04-14 00:45:22, Christoph Hellwig wrote:
> On Fri, Apr 11, 2014 at 06:52:42AM +0200, Fabian Frederick wrote:
> > Currently, there's no generic HW flush management support in kernel.
> > Only 7 filesystems have their own way to manage the barrier flag.
> > 
> > This patch adds MS_BARRIER in sb_flags and conditionnaly issues the flush
> > in generic_file_fsync.
> 
> Please don't add a binary mount option for something thast already is a
> text option in many filesystems.  We can actually enable/disable cache
> flushes at the block device level, so I think this can be
> unconditional.
  How can those be disabled? I didn't find that by a quick look through
/sys and flush code in kernel...

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