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From: Dave Chinner <david@fromorbit.com>
To: Christoph Hellwig <hch@infradead.org>
Cc: xfs@oss.sgi.com
Subject: Re: [PATCH 04/11] xfs: factor out xfs_da_grow_inode_int
Date: Tue, 12 Jul 2011 10:55:35 +1000	[thread overview]
Message-ID: <20110712005535.GJ23038@dastard> (raw)
In-Reply-To: <20110711052406.GA13266@infradead.org>

On Mon, Jul 11, 2011 at 01:24:06AM -0400, Christoph Hellwig wrote:
> On Mon, Jul 11, 2011 at 10:37:43AM +1000, Dave Chinner wrote:
> > On Sun, Jul 10, 2011 at 04:49:20PM -0400, Christoph Hellwig wrote:
> > > xfs_da_grow_inode and xfs_dir2_grow_inode are mostly duplicate code.  Factor
> > > the meat of those two functions into a new common helper.
> > 
> > Hmmmm. I'm in the process of splitting xfs_dir2_grow_inode() into
> > data space vs free space variants so I can play speculative
> > preallocation tricks in the directory data space to reduce dataspace
> > fragmentation for large directories. Combined with a rework of the
> > readir readahead code, it significantly reduces IO count and seeks
> > for readdir calls...
> > 
> > I'll probably just rebase on top of this patch, though, because I did
> > notice that the two functions were very similar to begin with. ;)
> 
> Are you two variants still sharing the core code?

Sort of - there's an extra allocation failure case added (multiple
directory block size allocation failure), but otherwise is the same.

> If yes rebasing sounds
> like the better idea.  If the two dir2 variants are different enough
> from the da variant I'm fine with postponing this one for now.

I'll rebase anyway - the code won't be ready for 3.1 because I
haven't yet started on the readahead optimisations that better
allocation allows. I also need to add dataspace truncation during
inactivation so that we don't leave blocks in the data space "beyond
EOF" that repair complains about on clean unmounts.

And FWIW, I think I now know enough about how this all works to be
able to implement online directory data space defragmentation now...

Cheers,

Dave.
-- 
Dave Chinner
david@fromorbit.com

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  reply	other threads:[~2011-07-12  0:55 UTC|newest]

Thread overview: 36+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-07-10 20:49 [PATCH 00/11] a few more cleanups for Linux 3.1 Christoph Hellwig
2011-07-10 20:49 ` [PATCH 01/11] xfs: reshuffle dir2 headers Christoph Hellwig
2011-07-11 22:32   ` Alex Elder
2011-07-12  9:06     ` Christoph Hellwig
2011-07-10 20:49 ` [PATCH 02/11] xfs: cleanup struct xfs_dir2_free Christoph Hellwig
2011-07-11 22:32   ` Alex Elder
2011-07-10 20:49 ` [PATCH 03/11] xfs: factor out xfs_dir2_leaf_find_stale Christoph Hellwig
2011-07-11 22:32   ` Alex Elder
2011-07-12  9:09     ` Christoph Hellwig
2011-07-13  6:49     ` Dave Chinner
2011-07-13  7:16       ` Christoph Hellwig
2011-07-13 10:28         ` Dave Chinner
2011-07-10 20:49 ` [PATCH 04/11] xfs: factor out xfs_da_grow_inode_int Christoph Hellwig
2011-07-11  0:37   ` Dave Chinner
2011-07-11  5:24     ` Christoph Hellwig
2011-07-12  0:55       ` Dave Chinner [this message]
2011-07-11 22:32   ` Alex Elder
2011-07-10 20:49 ` [PATCH 05/11] xfs: add a proper transaction pointer to struct xfs_buf Christoph Hellwig
2011-07-11 22:33   ` Alex Elder
2011-07-12  9:12     ` Christoph Hellwig
2011-07-10 20:49 ` [PATCH 06/11] xfs: remove wrappers around b_fspriv Christoph Hellwig
2011-07-11 22:33   ` Alex Elder
2011-07-12  1:02     ` Dave Chinner
2011-07-12  9:15       ` Christoph Hellwig
2011-07-10 20:49 ` [PATCH 07/11] xfs: remove wrappers around b_iodone Christoph Hellwig
2011-07-11 22:33   ` Alex Elder
2011-07-10 20:49 ` [PATCH 08/11] xfs: remove the unused xfs_buf_delwri_sort function Christoph Hellwig
2011-07-11 22:33   ` Alex Elder
2011-07-10 20:49 ` [PATCH 09/11] xfs: remove the dead QUOTADEBUG debug Christoph Hellwig
2011-07-11 22:33   ` Alex Elder
2011-07-12  0:59     ` Dave Chinner
2011-07-10 20:49 ` [PATCH 10/11] xfs: remove leftovers of the old btree tracing code Christoph Hellwig
2011-07-12  2:52   ` Alex Elder
2011-07-10 20:49 ` [PATCH 11/11] xfs: kill the dead XFS_DABUF debug code Christoph Hellwig
2011-07-11 22:33   ` Alex Elder
2011-07-13  6:51 ` [PATCH 00/11] a few more cleanups for Linux 3.1 Dave Chinner

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