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

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Message-ID: <45D495EA.3060200@redhat.com>
Date:	Thu, 15 Feb 2007 09:18:34 -0800
From:	Eric Sandeen <sandeen@...hat.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	"Theodore Ts'o" <tytso@....edu>, Alex Tomas <alex@...sterfs.com>,
	"linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>
Subject: Re: booked-page-flag.patch

Andrew Morton wrote:
> Sorry, we're seriously, seriously, seriously short on flags in the page
> struct and this patch is going to need one heck of a good case for it to be
> acceptable.

This was for the delayed allocation patchset, right; and by managing 
this at the page level that means we can't do this for block size < page 
size, I think...

There are already buffer head flags for delalloc (block to be allocated 
  on flush) and unwritten (actual block allocated to a file but not yet 
written) in the vfs - shouldn't we be looking at using those?

Unless there is a clear path from this patchset to one that supports 
blocks < page, I'm hesitant about it... but I know I'm being a bit of an 
armchair quarterback here, and I'll try to set aside some time to give 
this a better look.

Thanks,
-Eric
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