Re: [PATCH 1/8] xfs: factor DIO write mapping from get_blocks

[Dave Chinner <david@fromorbit.com>]

On Tue, Apr 14, 2015 at 10:23:46AM -0400, Brian Foster wrote:
> On Tue, Apr 14, 2015 at 05:26:44PM +1000, Dave Chinner wrote:
> > From: Dave Chinner <dchinner@redhat.com>
> > 
> > Clarify and separate the buffer mapping logic so that the direct IO mapping is
> > not tangled up in propagating the extent status to teh mapping buffer. This
> > makes it easier to extend the direct IO mapping to use an ioend in future.
> > 
> > Signed-off-by: Dave Chinner <dchinner@redhat.com>
> > ---
> >  fs/xfs/xfs_aops.c | 36 +++++++++++++++++++++++-------------
> >  1 file changed, 23 insertions(+), 13 deletions(-)
> > 
> > diff --git a/fs/xfs/xfs_aops.c b/fs/xfs/xfs_aops.c
> > index 3a9b7a1..5f7ddd5 100644
> > --- a/fs/xfs/xfs_aops.c
> > +++ b/fs/xfs/xfs_aops.c
> > @@ -1233,6 +1233,22 @@ xfs_vm_releasepage(
> >  	return try_to_free_buffers(page);
> >  }
> >  
> > +/*
> > + * do all the direct IO specific mapping buffer manipulation here.
> > + */
> > +static void
> > +xfs_map_direct(
> > +	struct inode		*inode,
> > +	struct buffer_head	*bh_result,
> > +	struct xfs_bmbt_irec	*imap,
> > +	xfs_off_t		offset)
> > +{
> > +	if (ISUNWRITTEN(imap)) {
> > +		bh_result->b_private = inode;
> > +		set_buffer_defer_completion(bh_result);
> > +	}
> > +}
> > +
> >  STATIC int
> >  __xfs_get_blocks(
> >  	struct inode		*inode,
> > @@ -1332,20 +1348,14 @@ __xfs_get_blocks(
> >  	}
> >  
> >  	if (imap.br_startblock != HOLESTARTBLOCK &&
> > -	    imap.br_startblock != DELAYSTARTBLOCK) {
> > -		/*
> > -		 * For unwritten extents do not report a disk address on
> > -		 * the read case (treat as if we're reading into a hole).
> > -		 */
> 
> Can we keep this comment and move it before this block?

*nod*.

Cheers,

Dave.
-- 
Dave Chinner
david@fromorbit.com

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