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From: Dave Chinner <david@fromorbit.com>
To: Christoph Hellwig <hch@infradead.org>
Cc: xfs@oss.sgi.com
Subject: Re: [PATCH 18/27] xfs: split out xfs inode operations into separate file
Date: Thu, 13 Jun 2013 18:00:09 +1000	[thread overview]
Message-ID: <20130613080009.GL29338@dastard> (raw)
In-Reply-To: <20130613011414.GB29338@dastard>

On Thu, Jun 13, 2013 at 11:14:14AM +1000, Dave Chinner wrote:
> On Wed, Jun 12, 2013 at 07:05:19AM -0700, Christoph Hellwig wrote:
> > On Wed, Jun 12, 2013 at 08:22:38PM +1000, Dave Chinner wrote:
> > > From: Dave Chinner <dchinner@redhat.com>
> > > 
> > > The core xfs inode operations such as locking, allocation, reading
> > > and writing are not shared with userspace. However, much of the
> > > remaining internal inode code such as the incore extent tracking and
> > > formatting is. Split the XFS inode operations out into a new
> > > xfs_inode_iops.c file to minimise the differences between the files
> > > shred with userspace.
> > 
> > Having struct xfs_inode in an xfs_inode_ops.h file while xfs_inode.h
> > is still around strikes me as extremely odd.
> 
> Consider it a first step in a longer process....
> 
> > It seems like icdinode
> > should be in xfs_inode_item.h as is part of the log format primarily.
> 
> Yes, I've definitely been looking at that, because xfs_inode_item.h is
> shared with userspace and there are some issues with cyclic
> inclusion and definitions in userspace based around the fact that
> the icdinode is defined in xfs_inode.h and so needs to be included
> before the struct xfs_inode is defined in include/libxfs.h. Yet
> there is static inline code in xfs_inode.h that needs to know the
> structure of the struct xfs_inode....

And this is where it gets sticky. The xfs_inode_ops.h header has a
dependency on struct xfs_icdinode. Moving that to xfs_inode_item.h
means that we now have a dependencies of:

	xfs_inode_ops.h requires
		xfs_inode_item.h requires:
			xfs_trans.h requires:
				xfs_log.h

which are new. And it also introduces a circular dependency as
xfs_inode_item.h has a dependency on the struct xfs_inode already
being defined, so it can't be included before struct xfs_inode is
defined.....

As it is, xfs_inode_item.h still has a section under #ifdef
__KERNEL__. It's the section dealing with the struct inode_log_item,
and all the other logitem header files have similar kernel only
sections.  libxfs has it's own definitions for these structures, so
what we've got here is the shared on-disk log format definitions and
kernel-only log item definitions sharing the same files in the
kernel tree.

So what I really think needs to happen here first is similar to the
dir2 header file re-org. That is, a header file to define the
format, and a header file to define the in-kernel structures and
APIs....

The header files in XFS have never been properly sorted out - it's
about time we cleaned up this mess ;)

Cheers,

Dave.
-- 
Dave Chinner
david@fromorbit.com

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  reply	other threads:[~2013-06-13  8:00 UTC|newest]

Thread overview: 56+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-06-12 10:22 [PATCH 00/27] xfs: current patch queue for 3.11 Dave Chinner
2013-06-12 10:22 ` [PATCH 01/27] xfs: update mount options documentation Dave Chinner
2013-06-13 13:34   ` Eric Sandeen
2013-06-14  0:40     ` Dave Chinner
2013-06-14  0:53       ` Eric Sandeen
2013-06-12 10:22 ` [PATCH 02/27] xfs: add pluging for bulkstat readahead Dave Chinner
2013-06-12 10:22 ` [PATCH 03/27] xfs: plug directory buffer readahead Dave Chinner
2013-06-12 10:22 ` [PATCH 04/27] xfs: don't use speculative prealloc for small files Dave Chinner
2013-06-12 16:10   ` Brian Foster
2013-06-13  0:50     ` Dave Chinner
2013-06-12 10:22 ` [PATCH 05/27] xfs: don't do IO when creating an new inode Dave Chinner
2013-06-12 10:22 ` [PATCH 06/27] xfs: xfs_ifree doesn't need to modify the inode buffer Dave Chinner
2013-06-12 10:22 ` [PATCH 07/27] xfs: Introduce ordered log vector support Dave Chinner
2013-06-12 10:22 ` [PATCH 08/27] xfs: Introduce an ordered buffer item Dave Chinner
2013-06-12 10:22 ` [PATCH 09/27] xfs: Inode create log items Dave Chinner
2013-06-12 10:22 ` [PATCH 10/27] xfs: Inode create transaction reservations Dave Chinner
2013-06-12 10:22 ` [PATCH 11/27] xfs: Inode create item recovery Dave Chinner
2013-06-12 10:22 ` [PATCH 12/27] xfs: Use inode create transaction Dave Chinner
2013-06-12 10:22 ` [PATCH 13/27] xfs: remove local fork format handling from xfs_bmapi_write() Dave Chinner
2013-06-12 10:22 ` [PATCH 14/27] xfs: move getdents code into it's own file Dave Chinner
2013-06-12 10:22 ` [PATCH 15/27] xfs: reshuffle dir2 definitions around for userspace Dave Chinner
2013-06-17 16:05   ` Christoph Hellwig
2013-06-18 21:12     ` Dave Chinner
2013-06-18 21:35       ` Dave Chinner
2013-06-12 10:22 ` [PATCH 16/27] xfs: split out attribute listing code into separate file Dave Chinner
2013-06-12 10:22 ` [PATCH 17/27] xfs: split out attribute fork truncation " Dave Chinner
2013-06-12 10:22 ` [PATCH 18/27] xfs: split out xfs inode operations " Dave Chinner
2013-06-12 14:05   ` Christoph Hellwig
2013-06-13  1:14     ` Dave Chinner
2013-06-13  8:00       ` Dave Chinner [this message]
2013-06-17 15:56         ` Christoph Hellwig
2013-06-17 18:14           ` Ben Myers
2013-06-18 20:40             ` Dave Chinner
2013-06-18 21:37               ` Ben Myers
2013-06-18 22:02                 ` Dave Chinner
2013-06-12 10:22 ` [PATCH 19/27] xfs: consolidate xfs_vnodeops.c into xfs_inode_ops.c Dave Chinner
2013-06-12 13:59   ` Christoph Hellwig
2013-06-13  1:39     ` Dave Chinner
2013-06-17 16:02       ` Christoph Hellwig
2013-06-18 20:55         ` Dave Chinner
2013-06-12 10:22 ` [PATCH 20/27] xfs: move xfs_getbmap to xfs_extent_ops.c Dave Chinner
2013-06-12 10:22 ` [PATCH 21/27] xfs: introduce xfs_sb.c for sharing with libxfs Dave Chinner
2013-06-12 10:22 ` [PATCH 22/27] xfs: move xfs_trans_reservations to xfs_trans.h Dave Chinner
2013-06-12 10:22 ` [PATCH 23/27] xfs: sync minor header differences needed by userspace Dave Chinner
2013-06-12 10:22 ` [PATCH 24/27] xfs: move xfs_bmap_punch_delalloc() to xfs_aops.c Dave Chinner
2013-06-12 14:06   ` Christoph Hellwig
2013-06-13  1:39     ` Dave Chinner
2013-06-12 10:22 ` [PATCH 25/27] xfs: split out transaction reservation code Dave Chinner
2013-06-12 10:22 ` [PATCH 26/27] xfs: minor cleanups Dave Chinner
2013-06-12 10:22 ` [PATCH 27/27] xfs: fix issues that cause userspace warnings Dave Chinner
2013-06-17 19:32   ` Brian Foster
2013-06-18 21:42     ` Dave Chinner
2013-06-12 13:06 ` [PATCH 00/27] xfs: current patch queue for 3.11 Brian Foster
2013-06-13  1:40   ` Dave Chinner
2013-06-12 14:17 ` Ben Myers
2013-06-13  1:58   ` Dave Chinner

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