From: "Theodore Ts'o" <tytso@mit.edu>
To: Badari Pulavarty <pbadari@us.ibm.com>
Cc: Jan Kara <jack@suse.cz>, Andrew Morton <akpm@osdl.org>,
sct@redhat.com, lkml <linux-kernel@vger.kernel.org>,
linux-fsdevel <linux-fsdevel@vger.kernel.org>
Subject: Re: ext3_ordered_writepage() questions
Date: Thu, 16 Mar 2006 19:44:29 -0500 [thread overview]
Message-ID: <20060317004429.GG29275@thunk.org> (raw)
In-Reply-To: <1142552722.21442.180.camel@dyn9047017100.beaverton.ibm.com>
On Thu, Mar 16, 2006 at 03:45:21PM -0800, Badari Pulavarty wrote:
> Yep. I wasn't expecting to see buffers in the transaction/log. I was
> expecting to see some "dummy" transaction - which these buffers are
> attached to provide ordering. (even though we are not doing metadata
> updates). In fact, I was expecting to see "ctime" update in the
> transaction.
What you're missing is that journal_start() and journal_stop() don't
create a transaction. They delimit an operation, yes, but multiple
operations are grouped together to form a transaction. Transactions
are only closed when after the commit_internal or if the journal runs
out of space. So you're not going to see a dummy transaction which
the buffers are attached to; instead, all of the various operations
happening within commit_interval are grouped into a single transaction.
This is all explained in Stephen's paper; see page #4 in:
http://ftp.kernel.org/pub/linux/kernel/people/sct/ext3/journal-design.ps.gz
- Ted
next prev parent reply other threads:[~2006-03-17 0:44 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-03-08 0:19 [RFC PATCH 0/3] VFS changes to collapse all the vectored and AIO support Badari Pulavarty
2006-03-08 0:22 ` [PATCH 1/3] Vectorize aio_read/aio_write methods Badari Pulavarty
2006-03-08 12:44 ` christoph
2006-03-08 0:23 ` [PATCH 2/3] Remove readv/writev methods and use aio_read/aio_write instead Badari Pulavarty
2006-03-08 12:45 ` christoph
2006-03-08 16:26 ` Badari Pulavarty
2006-03-08 0:24 ` [PATCH 3/3] Zach's core aio changes to support vectored AIO Badari Pulavarty
2006-03-08 3:37 ` Benjamin LaHaise
2006-03-08 16:34 ` Badari Pulavarty
2006-03-08 12:47 ` [RFC PATCH 0/3] VFS changes to collapse all the vectored and AIO support christoph
2006-03-08 16:24 ` Badari Pulavarty
2006-03-09 16:17 ` ext3_ordered_writepage() questions Badari Pulavarty
2006-03-09 23:35 ` Andrew Morton
2006-03-10 0:36 ` Badari Pulavarty
2006-03-16 18:09 ` Theodore Ts'o
2006-03-16 18:22 ` Badari Pulavarty
2006-03-16 21:04 ` Theodore Ts'o
2006-03-16 21:57 ` Badari Pulavarty
2006-03-16 22:05 ` Jan Kara
2006-03-16 23:45 ` Badari Pulavarty
2006-03-17 0:44 ` Theodore Ts'o [this message]
2006-03-17 0:54 ` Andreas Dilger
2006-03-17 17:05 ` Stephen C. Tweedie
2006-03-17 21:32 ` Badari Pulavarty
2006-03-17 22:22 ` Stephen C. Tweedie
2006-03-17 22:38 ` Badari Pulavarty
2006-03-17 23:23 ` Mingming Cao
2006-03-20 17:05 ` Stephen C. Tweedie
2006-03-18 2:57 ` Suparna Bhattacharya
2006-03-18 3:02 ` Suparna Bhattacharya
2006-03-17 15:32 ` Jamie Lokier
2006-03-17 21:50 ` Stephen C. Tweedie
2006-03-17 22:11 ` Theodore Ts'o
2006-03-17 22:44 ` Jamie Lokier
2006-03-18 23:40 ` Theodore Ts'o
2006-03-19 2:36 ` Jamie Lokier
2006-03-19 5:28 ` Chris Adams
2006-03-20 2:18 ` Theodore Ts'o
2006-03-20 16:26 ` Stephen C. Tweedie
2006-03-17 22:23 ` Jamie Lokier
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