linux-ext4 - Re: [RFC][PATCH 0/3] ext4: online defrag (ver 1.0)

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: <87f94c370902040651v388db0aak46d7843872d312ce@mail.gmail.com>
Date:	Wed, 4 Feb 2009 09:51:07 -0500
From:	Greg Freemyer <greg.freemyer@...il.com>
To:	Theodore Tso <tytso@....edu>
Cc:	Akira Fujita <a-fujita@...jp.nec.com>, linux-ext4@...r.kernel.org,
	linux-fsdevel@...r.kernel.org
Subject: Re: [RFC][PATCH 0/3] ext4: online defrag (ver 1.0)

On Wed, Feb 4, 2009 at 9:09 AM, Theodore Tso <tytso@....edu> wrote:
> On Wed, Feb 04, 2009 at 05:07:48PM +0900, Akira Fujita wrote:
>>> Do we want the ioctl name to be specific to defrag?  I thought Ted's
>>> goal was to make it more generic?  I can also envision this same ioctl
>>> being implemented by other file systems so EXT4 seems an inappropriate
>>> prefix.
>
> When I said generic I meant in terms of decomposing the functionality
> into multiple ioctls which each could be useful for multiple purposes.
> Not necessarily in terms of being used by other filesystem, because
> they will almost certainly have their own requirements.
>
> So for example, primitives like "allocate blocks for this inode from
> this region of the disk", or "don't allocate blocks for any inode in
> this region of disk", can be used for multiple things (such as on-line
> shrink), and not just defragmentation.
>
> I don't want to move this to the VFS layer, since it will involve huge
> amounts of time while people argue over generic issues regarding the
> interface.  Look at how long it took to settle on the FIEMAP
> interface; that's not an experience I care to repeat.

Convinced and request withdrawn.

Talking about this ioctl, can anyone say:

If the OHSM team implements a similar ioctl for ext2 and ext3 and
submits them for mainline at some point, do they have a chance of
being accepted or are ext2 and ext3 feature frozen?

Thanks
Greg
-- 
Greg Freemyer
Litigation Triage Solutions Specialist
http://www.linkedin.com/in/gregfreemyer
First 99 Days Litigation White Paper -
http://www.norcrossgroup.com/forms/whitepapers/99%20Days%20whitepaper.pdf

The Norcross Group
The Intersection of Evidence & Technology
http://www.norcrossgroup.com
--
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