linux-kernel - Re: POHMELFS high performance network filesystem. Transactions, failover, performance.

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Message-ID: <20080514083131.GA31506@2ka.mipt.ru>
Date:	Wed, 14 May 2008 12:31:31 +0400
From:	Evgeniy Polyakov <johnpol@....mipt.ru>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	linux-fsdevel@...r.kernel.org
Subject: Re: POHMELFS high performance network filesystem. Transactions, failover, performance.

On Wed, May 14, 2008 at 01:01:01AM -0700, Andrew Morton (akpm@...ux-foundation.org) wrote:
> > When ->writepage() is used, it has to wait until page is written (remote
> > side sent acknowledge), so if multiple pages are being written
> > simultaneously we either have to allocate shared structure or use
> > per-page wait.
> 
> That sounds exactly like wait_on_page_writeback()?

Except that we can interrupt waiting and have a timeout, which is
allowed there (page will be unlocked sometime in the future, but we
return error now).

> > Will lock_page_killable()/__lock_page_killable() be exported to modules?
> 
> Maybe, if there's a need.  I see no particular problem with that.

Every good boys, who write own ->writepages() and locks pages there,
want that.

-- 
	Evgeniy Polyakov
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