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From: Alex Tomas <alex@clusterfs.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Alex Tomas <alex@clusterfs.com>,
	Eric Sandeen <sandeen@redhat.com>,
	"Theodore Ts'o" <tytso@mit.edu>,
	"linux-ext4@vger.kernel.org" <linux-ext4@vger.kernel.org>
Subject: Re: booked-page-flag.patch
Date: Fri, 16 Feb 2007 00:07:55 +0300	[thread overview]
Message-ID: <m3fy973z9w.fsf@bzzz.home.net> (raw)
In-Reply-To: <20070215125654.b0f18ab3.akpm@linux-foundation.org> (Andrew Morton's message of "Thu\, 15 Feb 2007 12\:56\:54 -0800")

>>>>> Andrew Morton (AM) writes:

 AM> If the page doesn't have buffer-heads, set PG_private and clear page->private

 AM> If the page does have buffer_heads, use BH_Delay.

I did exactly this way in the first version, but later
got feeling that the community'd discard "ugly hack".

one more question: how much of it you want in VFS?

->get_block(with BH_Delay) can be used to signal
filesystem that no actual allocation is required.
so, aware filesystem can just reserve space. then
->writepages() should walk through the pages like
it does currently, collect contiugous sequences
and again call ->get_block(w/o BH_Delay) with b_size
covering all contiguous pages ...

thanks, Alex

  reply	other threads:[~2007-02-15 21:07 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-02-15  8:45 booked-page-flag.patch Andrew Morton
2007-02-15 14:03 ` booked-page-flag.patch Alex Tomas
2007-02-15 17:18 ` booked-page-flag.patch Eric Sandeen
2007-02-15 17:30   ` booked-page-flag.patch Alex Tomas
2007-02-15 20:56     ` booked-page-flag.patch Andrew Morton
2007-02-15 21:07       ` Alex Tomas [this message]
2007-02-15 23:23         ` booked-page-flag.patch Andrew Morton
2007-02-16  7:30           ` booked-page-flag.patch Alex Tomas
2007-02-16  7:46             ` booked-page-flag.patch Andrew Morton
2007-02-16  7:56               ` booked-page-flag.patch Alex Tomas
2007-02-16  8:06                 ` booked-page-flag.patch Andrew Morton
2007-02-16 12:14                   ` booked-page-flag.patch Andreas Dilger
2007-02-16 16:02               ` booked-page-flag.patch Dave Kleikamp
2007-02-16 15:03           ` booked-page-flag.patch Theodore Tso
2007-02-15 20:21   ` booked-page-flag.patch Andrew Morton
2007-02-16 12:17   ` booked-page-flag.patch Andreas Dilger

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