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From: Dave Chinner <david@fromorbit.com>
To: Alex Elder <aelder@sgi.com>
Cc: xfs@oss.sgi.com
Subject: Re: [PATCH 5/8] xfs: split direct IO write path from xfs_file_aio_write
Date: Wed, 5 Jan 2011 18:36:25 +1100	[thread overview]
Message-ID: <20110105073625.GA8322@dastard> (raw)
In-Reply-To: <1294192495.2485.726.camel@doink>

On Tue, Jan 04, 2011 at 07:54:55PM -0600, Alex Elder wrote:
> On Tue, 2011-01-04 at 15:48 +1100, Dave Chinner wrote:
> > From: Dave Chinner <dchinner@redhat.com>
> > 
> > The current xfs_file_aio_write code is a mess of locking shenanigans
> > to handle the different locking requirements of buffered and direct
> > IO. Start to clean this up by disentangling the direct IO path from
> > the mess.
> 
> All good, very good.  But I'm not sure why you cut
> out the code that backed off to buffered I/O if
> generic_file_direct_write() returns an error.
> (You gave no explanation.)

Oh, I thought I put one in there. It's simple, though - XFS handles
all allocation cases in the direct IO code and never returns a
result that will require falling back to the buffered IO path.  It
is basically a code path that has been unused for years and all it
does is make the logic much more complex to understand.

I'll add that to the commit message....

Cheers,

Dave.
-- 
Dave Chinner
david@fromorbit.com

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  reply	other threads:[~2011-01-05  7:34 UTC|newest]

Thread overview: 28+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-01-04  4:48 [PATCH 0/8] xfs: prevent corruption due to overlapping AIO DIO V2 Dave Chinner
2011-01-04  4:48 ` [PATCH 1/8] xfs: ensure sync write errors are returned Dave Chinner
2011-01-05  1:53   ` Alex Elder
2011-01-07  8:45   ` Christoph Hellwig
2011-01-07  9:07     ` Dave Chinner
2011-01-04  4:48 ` [PATCH 2/8] xfs: factor common post-write isize handling code Dave Chinner
2011-01-05  1:54   ` Alex Elder
2011-01-04  4:48 ` [PATCH 4/8] xfs: introduce xfs_rw_lock() helpers for locking the inode Dave Chinner
2011-01-05  1:54   ` Alex Elder
2011-01-05  7:55     ` Dave Chinner
2011-01-04  4:48 ` [PATCH 5/8] xfs: split direct IO write path from xfs_file_aio_write Dave Chinner
2011-01-05  1:54   ` Alex Elder
2011-01-05  7:36     ` Dave Chinner [this message]
2011-01-07  8:58   ` Christoph Hellwig
2011-01-07  9:21     ` Dave Chinner
2011-01-04  4:48 ` [PATCH 6/8] xfs: split buffered " Dave Chinner
2011-01-05  1:55   ` Alex Elder
2011-01-04  4:48 ` [PATCH 7/8] xfs: factor common write setup code Dave Chinner
2011-01-05  1:55   ` Alex Elder
2011-01-07  8:53   ` Christoph Hellwig
2011-01-07  9:20     ` Dave Chinner
2011-01-04  4:48 ` [PATCH 8/8] xfs: serialise unaligned direct IOs Dave Chinner
2011-01-05  1:55   ` Alex Elder
2011-01-05  1:53 ` [PATCH 0/8] xfs: prevent corruption due to overlapping AIO DIO V2 Alex Elder
  -- strict thread matches above, loose matches on Subject: below --
2011-01-07 11:30 [PATCH 0/8] xfs: prevent corruption due to overlapping AIO DIO V3 Dave Chinner
2011-01-07 11:30 ` [PATCH 5/8] xfs: split direct IO write path from xfs_file_aio_write Dave Chinner
2011-01-10 19:24   ` Christoph Hellwig
2011-01-10 23:37 [PATCH 0/8] xfs: prevent corruption due to overlapping AIO DIO V4 Dave Chinner
2011-01-10 23:37 ` [PATCH 5/8] xfs: split direct IO write path from xfs_file_aio_write Dave Chinner
2011-01-11 21:44   ` Alex Elder

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