linux-kernel - Re: [RFC] fsblock

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Date:	Sat, 30 Jun 2007 11:42:44 +0100
From:	Christoph Hellwig <hch@...radead.org>
To:	Jeff Garzik <jeff@...zik.org>
Cc:	Nick Piggin <npiggin@...e.de>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linux Memory Management List <linux-mm@...ck.org>,
	linux-fsdevel@...r.kernel.org
Subject: Re: [RFC] fsblock

On Sat, Jun 23, 2007 at 11:07:54PM -0400, Jeff Garzik wrote:
> >- In line with the above item, filesystem block allocation is performed
> >  before a page is dirtied. In the buffer layer, mmap writes can dirty a
> >  page with no backing blocks which is a problem if the filesystem is
> >  ENOSPC (patches exist for buffer.c for this).
> 
> This raises an eyebrow...  The handling of ENOSPC prior to mmap write is 
> more an ABI behavior, so I don't see how this can be fixed with internal 
> changes, yet without changing behavior currently exported to userland 
> (and thus affecting code based on such assumptions).

Not really, the current behaviour is a bug.  And it's not actually buffer
layer specific - XFS now has a fix for that bug and it's generic enough
that everyone could use it.

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