linux-kernel - Re: [PATCH v3 11/14] xfs: Only free full extents for forcealign

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Message-ID: <ZrK7GrDSebnXXzF6@dread.disaster.area>
Date: Wed, 7 Aug 2024 10:08:58 +1000
From: Dave Chinner <david@...morbit.com>
To: "Darrick J. Wong" <djwong@...nel.org>
Cc: John Garry <john.g.garry@...cle.com>, chandan.babu@...cle.com,
	dchinner@...hat.com, hch@....de, viro@...iv.linux.org.uk,
	brauner@...nel.org, jack@...e.cz, linux-xfs@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	catherine.hoang@...cle.com, martin.petersen@...cle.com
Subject: Re: [PATCH v3 11/14] xfs: Only free full extents for forcealign

On Tue, Aug 06, 2024 at 12:27:38PM -0700, Darrick J. Wong wrote:
> On Thu, Aug 01, 2024 at 04:30:54PM +0000, John Garry wrote:
> > Like we already do for rtvol, only free full extents for forcealign in
> > xfs_free_file_space().
> > 
> > Reviewed-by: "Darrick J. Wong" <djwong@...nel.org> #earlier version
> > Signed-off-by: John Garry <john.g.garry@...cle.com>
> > ---
> >  fs/xfs/xfs_bmap_util.c |  7 ++-----
> >  fs/xfs/xfs_inode.c     | 14 ++++++++++++++
> >  fs/xfs/xfs_inode.h     |  2 ++
> >  3 files changed, 18 insertions(+), 5 deletions(-)
> > 
> > diff --git a/fs/xfs/xfs_bmap_util.c b/fs/xfs/xfs_bmap_util.c
> > index 60389ac8bd45..46eebecd7bba 100644
> > --- a/fs/xfs/xfs_bmap_util.c
> > +++ b/fs/xfs/xfs_bmap_util.c
> > @@ -854,11 +854,8 @@ xfs_free_file_space(
> >  	startoffset_fsb = XFS_B_TO_FSB(mp, offset);
> >  	endoffset_fsb = XFS_B_TO_FSBT(mp, offset + len);
> >  
> > -	/* We can only free complete realtime extents. */
> > -	if (xfs_inode_has_bigrtalloc(ip)) {
> > -		startoffset_fsb = xfs_rtb_roundup_rtx(mp, startoffset_fsb);
> > -		endoffset_fsb = xfs_rtb_rounddown_rtx(mp, endoffset_fsb);
> > -	}
> > +	/* Free only complete extents. */
> > +	xfs_roundin_to_alloc_fsbsize(ip, &startoffset_fsb, &endoffset_fsb);
> 
> ...and then this becomes:
> 
> 	/* We can only free complete allocation units. */
> 	startoffset_fsb = xfs_inode_roundup_alloc_unit(ip, startoffset_fsb);
> 	endoffset_fsb = xfs_inode_rounddown_alloc_unit(ip, endoffset_fsb);

I much prefer this (roundup/rounddown) to the "in/out" API.

-Dave.
-- 
Dave Chinner
david@...morbit.com