linux-ext4 - Re: booked-page-flag.patch

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Message-Id: <1171641757.8468.9.camel@kleikamp.austin.ibm.com>
Date:	Fri, 16 Feb 2007 10:02:37 -0600
From:	Dave Kleikamp <shaggy@...ux.vnet.ibm.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Alex Tomas <alex@...sterfs.com>, Eric Sandeen <sandeen@...hat.com>,
	"Theodore Ts'o" <tytso@....edu>,
	"linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>
Subject: Re: booked-page-flag.patch

On Thu, 2007-02-15 at 23:46 -0800, Andrew Morton wrote:
> On Fri, 16 Feb 2007 10:30:39 +0300 Alex Tomas <alex@...sterfs.com> wrote:
> > hmm. I thought it has to call get_block() at least to know whether
> > the block is already allocated. and I was going to reserve space
> > in prepare_write for which some fs-specific method is needed becase
> > only fs knows how much metadata it'd need.
> 
> Well, one could just assume that the page has no disk mapping and go and
> make the space reservation.  Things will work out OK when we come to do
> writepage().
> 
> Or one could do both: call get_block() only if the page was inside i_size.

Or call get_block() with create = 0.  Or replace the create argument
with a flags field that can take either GET_BLOCK_CREATE or
GET_BLOCK_RESERVE.
-- 
David Kleikamp
IBM Linux Technology Center

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