From: Jeff Garzik <jeff@garzik.org>
To: Andrew Morton <akpm@osdl.org>
Cc: Badari Pulavarty <pbadari@us.ibm.com>,
cmm@us.ibm.com, linux-kernel@vger.kernel.org,
ext2-devel@lists.sourceforge.net, linux-fsdevel@vger.kernel.org
Subject: Re: [PATCH 1/5] Forking ext4 filesystem from ext3 filesystem
Date: Thu, 10 Aug 2006 17:00:28 -0400 [thread overview]
Message-ID: <44DB9E6C.9070808@garzik.org> (raw)
In-Reply-To: <20060810132720.4d9fced4.akpm@osdl.org>
Andrew Morton wrote:
> On Thu, 10 Aug 2006 16:13:33 -0400
> Jeff Garzik <jeff@garzik.org> wrote:
>
>> The sooner we kill buffer heads and use submit_bio(), the better :)
>
> A buffer_head is a caching entity and a bio is an IO container. They're
> quite separate concepts.
Yeah, sorry, I meant direct pagecache I/O. I forgot that bio doesn't
handle caching.
> A buffer_head is the kernel's sole abstraction of a disk block.
> Filesystems use disk blocks a lot, and they need such an abstraction.
IMO Al Viro work has shown that you can do pagecache I/O without needing
such a heavyweight system.
Jeff
WARNING: multiple messages have this Message-ID (diff)
From: Jeff Garzik <jeff@garzik.org>
To: Andrew Morton <akpm@osdl.org>
Cc: linux-fsdevel@vger.kernel.org, cmm@us.ibm.com,
ext2-devel@lists.sourceforge.net,
Badari Pulavarty <pbadari@us.ibm.com>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 1/5] Forking ext4 filesystem from ext3 filesystem
Date: Thu, 10 Aug 2006 17:00:28 -0400 [thread overview]
Message-ID: <44DB9E6C.9070808@garzik.org> (raw)
In-Reply-To: <20060810132720.4d9fced4.akpm@osdl.org>
Andrew Morton wrote:
> On Thu, 10 Aug 2006 16:13:33 -0400
> Jeff Garzik <jeff@garzik.org> wrote:
>
>> The sooner we kill buffer heads and use submit_bio(), the better :)
>
> A buffer_head is a caching entity and a bio is an IO container. They're
> quite separate concepts.
Yeah, sorry, I meant direct pagecache I/O. I forgot that bio doesn't
handle caching.
> A buffer_head is the kernel's sole abstraction of a disk block.
> Filesystems use disk blocks a lot, and they need such an abstraction.
IMO Al Viro work has shown that you can do pagecache I/O without needing
such a heavyweight system.
Jeff
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next prev parent reply other threads:[~2006-08-10 21:01 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-08-10 1:17 [PATCH 1/5] Forking ext4 filesystem from ext3 filesystem Mingming Cao
2006-08-10 6:39 ` Andrew Morton
2006-08-10 6:39 ` Andrew Morton
2006-08-10 16:41 ` Mingming Cao
2006-08-10 16:41 ` Mingming Cao
2006-08-10 16:48 ` Jörn Engel
2006-08-10 16:48 ` Jörn Engel
2006-08-10 18:18 ` Andrew Morton
2006-08-10 18:18 ` Andrew Morton
2006-08-10 20:22 ` Jeff Garzik
2006-08-10 20:22 ` Jeff Garzik
2006-08-10 20:33 ` Andrew Morton
2006-08-10 20:33 ` Andrew Morton
2006-08-10 20:52 ` Jeff Garzik
2006-08-10 17:44 ` [Ext2-devel] " Theodore Tso
2006-08-10 17:44 ` Theodore Tso
2006-08-10 18:51 ` Badari Pulavarty
2006-08-10 19:23 ` Andrew Morton
2006-08-10 19:23 ` Andrew Morton
2006-08-10 19:36 ` [Ext2-devel] " Dave Kleikamp
2006-08-10 19:36 ` Dave Kleikamp
2006-08-10 19:54 ` [Ext2-devel] " Andrew Morton
2006-08-10 19:54 ` Andrew Morton
2006-08-10 20:12 ` Jeff Garzik
2006-08-10 20:12 ` Jeff Garzik
2006-08-10 20:13 ` Jeff Garzik
2006-08-10 20:13 ` Jeff Garzik
2006-08-10 20:27 ` Andrew Morton
2006-08-10 20:27 ` Andrew Morton
2006-08-10 21:00 ` Jeff Garzik [this message]
2006-08-10 21:00 ` Jeff Garzik
2006-08-10 21:11 ` [Ext2-devel] " Alex Tomas
2006-08-10 21:11 ` Alex Tomas
2006-08-10 22:18 ` [Ext2-devel] " Andrew Morton
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