linux-kernel - Re: [PATCH 5/9] writeback: introduce the pageout work

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Message-ID: <20120301123640.GA30369@localhost>
Date:	Thu, 1 Mar 2012 20:36:40 +0800
From:	Fengguang Wu <fengguang.wu@...el.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Greg Thelen <gthelen@...gle.com>, Jan Kara <jack@...e.cz>,
	Ying Han <yinghan@...gle.com>,
	"hannes@...xchg.org" <hannes@...xchg.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Rik van Riel <riel@...hat.com>, Mel Gorman <mgorman@...e.de>,
	Minchan Kim <minchan.kim@...il.com>,
	Linux Memory Management List <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 5/9] writeback: introduce the pageout work

> Please have a think about all of this and see if you can demonstrate
> how the iput() here is guaranteed safe.

There are already several __iget()/iput() calls inside fs-writeback.c.
The existing iput() calls already demonstrate its safety?

Basically the flusher works in this way

- the dirty inode list i_wb_list does not reference count the inode at all

- the flusher thread does something analog to igrab() and set I_SYNC
  before going off to writeout the inode

- evice() will wait for completion of I_SYNC

Thanks,
Fengguang
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