linux-kernel - Re: [GIT PULL] one writeback regression fix for .36

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Message-ID: <20101006183124.GR19804@ZenIV.linux.org.uk>
Date:	Wed, 6 Oct 2010 19:31:24 +0100
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Jens Axboe <jaxboe@...ionio.com>, Christoph Hellwig <hch@....de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [GIT PULL] one writeback regression fix for .36

On Wed, Oct 06, 2010 at 11:17:54AM -0700, Linus Torvalds wrote:
> > Christoph Hellwig (1):
> > ? ? ?writeback: always use sb->s_bdi for writeback purposes
> 
> This is a f*cking disgrace. It's now the second patch I see during
> this release window that works by parsing random strings in the block
> device layer.
> 
> This needs to stop. There's something seriously wrong in the whole
> subsystem. This kind of hackery is a disease, and it seems to be
> endemic.

Eh...  I'm no fonder of that than you are (and strcmp is fucking stupid),
but... that thing is really sb_is_blkdev_sb() trying to make a comeback
in fs/fs-writeback.c.  IOW, it's sick, but not for the reasons you are
mentioning; strcmp() use is trivially removable.
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