Re: [PATCH 0/4] (RESEND) ext3[34] barrier changes

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To: Chris Mason <chris.mason@...>

Cc: Andi Kleen <andi@...>, Andrew Morton <akpm@...>, Eric Sandeen <sandeen@...>, <linux-ext4@...>, <linux-kernel@...>, <linux-fsdevel@...>, <jamie@...>

Subject: Re: [PATCH 0/4] (RESEND) ext3[34] barrier changes

Date: Monday, May 19, 2008 - 10:46 am

On Mon, May 19, 2008 at 09:26:41AM -0400, Chris Mason wrote:
quoted text> >
> > Didn't ext4 have some new checksum trick to avoid them?
> 
> I didn't think checksumming avoided barriers completely.  Just the barrier 
> before the commit block, not the barrier after.

Funny thing, I was looking in this over the weekend.  It currently
avoids barriers entirely if journal_async_commit is enabled (which is
not the default); if enabled, it effectively forces barrier=0.  This
is IMHO a bug.

I'm working on a patch where "barrier=1" will use a barrier before and
after, and "barrier=1,journal_async_commit" will use a barrier after.

       	   				    	     - Ted
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Messages in current thread:

[PATCH 0/4] (RESEND) ext3[34] barrier changes, Eric Sandeen, (Fri May 16, 3:02 pm)

Re: [PATCH 0/4] (RESEND) ext3[34] barrier changes, Andrew Morton, (Fri May 16, 4:05 pm)

Re: [PATCH 0/4] (RESEND) ext3[34] barrier changes, Eric Sandeen, (Thu May 29, 9:36 am)

Re: [PATCH 0/4] (RESEND) ext3[34] barrier changes, Pavel Machek, (Mon May 19, 5:04 am)

Re: [PATCH 0/4] (RESEND) ext3[34] barrier changes, Andi Kleen, (Sun May 18, 3:54 pm)

Re: [PATCH 0/4] (RESEND) ext3[34] barrier changes, Chris Mason, (Mon May 19, 9:26 am)

Re: [PATCH 0/4] (RESEND) ext3[34] barrier changes, Jamie Lokier, (Tue May 20, 11:36 am)

Re: [PATCH 0/4] (RESEND) ext3[34] barrier changes, Chris Mason, (Tue May 20, 12:02 pm)

Re: [PATCH 0/4] (RESEND) ext3[34] barrier changes, Jamie Lokier, (Tue May 20, 12:27 pm)

Re: [PATCH 0/4] (RESEND) ext3[34] barrier changes, Chris Mason, (Tue May 20, 1:08 pm)

Re: [PATCH 0/4] (RESEND) ext3[34] barrier changes, Jamie Lokier, (Tue May 20, 6:26 pm)

Re: [PATCH 0/4] (RESEND) ext3[34] barrier changes, Theodore Tso, (Mon May 19, 10:46 am)

Re: [PATCH 0/4] (RESEND) ext3[34] barrier changes, Ric Wheeler, (Fri May 23, 2:33 pm)

[PATCH, RFC] ext4: Fix use of write barrier in commit logic, Theodore Tso, (Mon May 19, 10:51 pm)

Re: [PATCH, RFC] ext4: Fix use of write barrier in commit lo..., Jamie Lokier, (Tue May 20, 11:23 am)

Re: [PATCH 0/4] (RESEND) ext3[34] barrier changes, Jamie Lokier, (Fri May 16, 6:30 pm)

Re: [PATCH 0/4] (RESEND) ext3[34] barrier changes, Eric Sandeen, (Fri May 16, 4:53 pm)

Re: [PATCH 0/4] (RESEND) ext3[34] barrier changes, Jamie Lokier, (Fri May 16, 6:03 pm)

Re: [PATCH 0/4] (RESEND) ext3[34] barrier changes, Theodore Tso, (Sun May 18, 8:28 pm)

Re: [PATCH 0/4] (RESEND) ext3[34] barrier changes, Jamie Lokier, (Tue May 20, 11:13 am)

Re: [PATCH 0/4] (RESEND) ext3[34] barrier changes, Greg Smith, (Wed May 21, 4:25 pm)

Re: [PATCH 0/4] (RESEND) ext3[34] barrier changes, Eric Sandeen, (Fri May 16, 6:21 pm)

Re: [PATCH 0/4] (RESEND) ext3[34] barrier changes, Andi Kleen, (Sun May 18, 4:03 pm)

Re: [PATCH 0/4] (RESEND) ext3[34] barrier changes, Theodore Tso, (Sun May 18, 8:43 pm)

Re: [PATCH 0/4] (RESEND) ext3[34] barrier changes, Eric Sandeen, (Sun May 18, 10:29 pm)

Re: [PATCH 0/4] (RESEND) ext3[34] barrier changes, Jamie Lokier, (Tue May 20, 7:35 pm)

Re: [PATCH 0/4] (RESEND) ext3[34] barrier changes, Andrew Morton, (Mon May 19, 12:11 am)

Re: [PATCH 0/4] (RESEND) ext3[34] barrier changes, Chris Mason, (Mon May 19, 1:16 pm)

Re: [PATCH 0/4] (RESEND) ext3[34] barrier changes, Daniel Phillips, (Wed May 21, 6:30 pm)

Re: [PATCH 0/4] (RESEND) ext3[34] barrier changes, Jamie Lokier, (Tue May 20, 10:58 am)

Re: [PATCH 0/4] (RESEND) ext3[34] barrier changes, Chris Mason, (Mon May 19, 2:39 pm)

Re: [PATCH 0/4] (RESEND) ext3[34] barrier changes, Pavel Machek, (Wed May 21, 7:22 am)

Re: [PATCH 0/4] (RESEND) ext3[34] barrier changes, Andrew Morton, (Wed May 21, 2:03 pm)

Re: [PATCH 0/4] (RESEND) ext3[34] barrier changes, Jamie Lokier, (Wed May 21, 3:54 pm)

Re: [PATCH 0/4] (RESEND) ext3[34] barrier changes, Theodore Tso, (Wed May 21, 2:29 pm)

Re: [PATCH 0/4] (RESEND) ext3[34] barrier changes, Jamie Lokier, (Wed May 21, 3:36 pm)

Re: [PATCH 0/4] (RESEND) ext3[34] barrier changes, Chris Mason, (Wed May 21, 3:40 pm)

Re: [PATCH 0/4] (RESEND) ext3[34] barrier changes, Andrew Morton, (Wed May 21, 2:49 pm)

Re: [PATCH 0/4] (RESEND) ext3[34] barrier changes, Jamie Lokier, (Wed May 21, 3:42 pm)

Re: [PATCH 0/4] (RESEND) ext3[34] barrier changes, Eric Sandeen, (Wed May 21, 2:15 pm)

Re: [PATCH 0/4] (RESEND) ext3[34] barrier changes, Jamie Lokier, (Wed May 21, 3:43 pm)

Re: [PATCH 0/4] (RESEND) ext3[34] barrier changes, Theodore Tso, (Wed May 21, 8:32 am)

Re: [PATCH 0/4] (RESEND) ext3[34] barrier changes, Jens Axboe, (Tue May 20, 4:25 am)

Re: [PATCH 0/4] (RESEND) ext3[34] barrier changes, Chris Mason, (Tue May 20, 8:17 am)

Re: [PATCH 0/4] (RESEND) ext3[34] barrier changes, Jan Kara, (Mon May 19, 6:39 pm)

Re: [PATCH 0/4] (RESEND) ext3[34] barrier changes, Chris Mason, (Mon May 19, 8:29 pm)

Re: [PATCH 0/4] (RESEND) ext3[34] barrier changes, Timothy Shimmin, (Mon May 19, 11:29 pm)

Re: [PATCH 0/4] (RESEND) ext3[34] barrier changes, Chris Mason, (Tue May 20, 8:04 am)

Re: [PATCH 0/4] (RESEND) ext3[34] barrier changes, Jamie Lokier, (Fri May 16, 6:53 pm)

Re: [PATCH 0/4] (RESEND) ext3[34] barrier changes, Theodore Tso, (Fri May 16, 8:20 pm)

Re: [PATCH 0/4] (RESEND) ext3[34] barrier changes, Andrew Morton, (Fri May 16, 8:35 pm)

Re: [PATCH 0/4] (RESEND) ext3[34] barrier changes, Chris Mason, (Sat May 17, 8:48 pm)

Re: [PATCH 0/4] (RESEND) ext3[34] barrier changes, Jamie Lokier, (Tue May 20, 7:44 pm)

Re: [PATCH 0/4] (RESEND) ext3[34] barrier changes, Theodore Tso, (Sat May 17, 9:36 pm)

Re: [PATCH 0/4] (RESEND) ext3[34] barrier changes, Ric Wheeler, (Sun May 18, 10:49 am)

Re: [PATCH 0/4] (RESEND) ext3[34] barrier changes, Jamie Lokier, (Tue May 20, 7:48 pm)

Re: [PATCH 0/4] (RESEND) ext3[34] barrier changes, Jamie Lokier, (Tue May 20, 10:42 am)

Re: [PATCH 0/4] (RESEND) ext3[34] barrier changes, Theodore Tso, (Sat May 17, 9:43 am)

Re: [PATCH 0/4] (RESEND) ext3[34] barrier changes, Theodore Tso, (Sat May 17, 4:44 pm)

Re: [PATCH 0/4] (RESEND) ext3[34] barrier changes, Jamie Lokier, (Tue May 20, 10:45 am)

Re: [PATCH 0/4] (RESEND) ext3[34] barrier changes, Andreas Dilger, (Sat May 17, 1:59 pm)

Re: [PATCH 0/4] (RESEND) ext3[34] barrier changes, Andrew Morton, (Fri May 16, 4:58 pm)

Re: [PATCH 0/4] (RESEND) ext3[34] barrier changes, Jamie Lokier, (Fri May 16, 5:45 pm)

Re: [PATCH 0/4] (RESEND) ext3[34] barrier changes, Eric Sandeen, (Fri May 16, 6:03 pm)

Re: [PATCH 0/4] (RESEND) ext3[34] barrier changes, Jamie Lokier, (Fri May 16, 6:09 pm)

[PATCH 4/4] ext4: call blkdev_issue_flush on fsync, Eric Sandeen, (Fri May 16, 3:09 pm)

Re: [PATCH 4/4] ext4: call blkdev_issue_flush on fsync, Theodore Tso, (Mon May 19, 10:34 pm)

Re: [PATCH 4/4] ext4: call blkdev_issue_flush on fsync, Jamie Lokier, (Tue May 20, 11:43 am)

Re: [PATCH 4/4] ext4: call blkdev_issue_flush on fsync, Jens Axboe, (Tue May 20, 3:54 pm)

Re: [PATCH 4/4] ext4: call blkdev_issue_flush on fsync, Jamie Lokier, (Tue May 20, 6:02 pm)

Re: [PATCH 4/4] ext4: call blkdev_issue_flush on fsync, Jens Axboe, (Wed May 21, 3:30 am)

Re: [PATCH 4/4] ext4: call blkdev_issue_flush on fsync, Eric Sandeen, (Tue May 20, 11:52 am)

Re: [PATCH 4/4] ext4: call blkdev_issue_flush on fsync, Jens Axboe, (Tue May 20, 4:14 pm)

[PATCH 3/4] ext4: enable barriers by default, Eric Sandeen, (Fri May 16, 3:08 pm)

[PATCH 2/4] ext3: call blkdev_issue_flush on fsync, Eric Sandeen, (Fri May 16, 3:07 pm)

Re: [PATCH 2/4] ext3: call blkdev_issue_flush on fsync, Jamie Lokier, (Fri May 16, 6:15 pm)

[PATCH 1/4] ext3: enable barriers by default, Eric Sandeen, (Fri May 16, 3:05 pm)

Re: [PATCH 1/4] ext3: enable barriers by default, Pavel Machek, (Mon May 19, 4:58 am)

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