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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <m3fy973z9w.fsf@bzzz.home.net>
Date:	Fri, 16 Feb 2007 00:07:55 +0300
From:	Alex Tomas <alex@...sterfs.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

>>>>> 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
-
To unsubscribe from this list: send the line "unsubscribe linux-ext4" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html