linux-kernel - Re: introduce dm-snap-mv

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: <20101008092427.GA5426@lst.de>
Date:	Fri, 8 Oct 2010 11:24:27 +0200
From:	Christoph Hellwig <hch@....de>
To:	McPacino <mcpacino@...il.com>
Cc:	Christoph Hellwig <hch@....de>,
	Daniel Phillips <phillips@...nq.net>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	dm-devel@...hat.com, Andrew Morton <akpm@...ux-foundation.org>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Nick Piggin <npiggin@...nel.dk>
Subject: Re: introduce dm-snap-mv

On Fri, Oct 08, 2010 at 05:14:27PM +0800, McPacino wrote:
> Hi Christoph,
> 
> I have to take care the cache problem If using the bio directly.
> BHs can be released by kernel when necessary.
> 
> Is there any existing code using bio to read/write metadata
> blocks? How do they handle the timing freeing bios? I really
> wish to learn something form it.

If you actually need caching just use the pagecache, e.g.
read_mapping_page to read in your data.  That completely abstracts
away the underlying block size.

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/