linux-ext4 - Re: [RFC][PATCH 2/3] Move the file data to the new blocks

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 for Android: free password hash cracker in your pocket

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

Message-Id: <20070206173520.7719a7de.akpm@linux-foundation.org>
Date:	Tue, 6 Feb 2007 17:35:20 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Jan Kara <jack@...e.cz>
Cc:	sho@...s.nec.co.jp, linux-ext4@...r.kernel.org,
	linux-fsdevel@...r.kernel.org
Subject: Re: [RFC][PATCH 2/3] Move the file data to the new blocks

On Mon, 5 Feb 2007 14:12:04 +0100
Jan Kara <jack@...e.cz> wrote:

> > Move the blocks on the temporary inode to the original inode
> > by a page.
> > 1. Read the file data from the old blocks to the page
> > 2. Move the block on the temporary inode to the original inode
> > 3. Write the file data on the page into the new blocks
>   I have one thing - it's probably not good to use page cache for
> defragmentation.

Then it is no longer online defragmentation.  The issues with maintaining
correctness and coherency with ongoing VFS activity would be truly ghastly.

If we're worried about pagecache pollution then it would be better to control
that from userspace via fadvise().
-
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