Re: [PATCH 05/18] xfs: move locking into xfs_bmap_punch_delalloc_range

[Brian Foster <bfoster@redhat.com>]

On Wed, May 30, 2018 at 09:58:04AM -0700, Darrick J. Wong wrote:
> On Wed, May 30, 2018 at 09:35:52AM -0400, Brian Foster wrote:
> > On Wed, May 30, 2018 at 12:00:00PM +0200, Christoph Hellwig wrote:
> > > Both callers want the same looking, so do it only once.
> > > 
> > > Signed-off-by: Christoph Hellwig <hch@lst.de>
> > > ---
> > >  fs/xfs/xfs_aops.c      | 2 --
> > >  fs/xfs/xfs_bmap_util.c | 7 ++++---
> > >  fs/xfs/xfs_iomap.c     | 3 ---
> > >  3 files changed, 4 insertions(+), 8 deletions(-)
> > > 
> > > diff --git a/fs/xfs/xfs_aops.c b/fs/xfs/xfs_aops.c
> > > index f2333e351e07..5dd09e83c81c 100644
> > > --- a/fs/xfs/xfs_aops.c
> > > +++ b/fs/xfs/xfs_aops.c
> > > @@ -761,10 +761,8 @@ xfs_aops_discard_page(
> > >  		"page discard on page "PTR_FMT", inode 0x%llx, offset %llu.",
> > >  			page, ip->i_ino, offset);
> > >  
> > > -	xfs_ilock(ip, XFS_ILOCK_EXCL);
> > >  	error = xfs_bmap_punch_delalloc_range(ip, start_fsb,
> > >  			PAGE_SIZE / i_blocksize(inode));
> > > -	xfs_iunlock(ip, XFS_ILOCK_EXCL);
> > >  	if (error && !XFS_FORCED_SHUTDOWN(mp))
> > >  		xfs_alert(mp, "page discard unable to remove delalloc mapping.");
> > >  out_invalidate:
> > > diff --git a/fs/xfs/xfs_bmap_util.c b/fs/xfs/xfs_bmap_util.c
> > > index f2b87873612d..86a7ee425bfc 100644
> > > --- a/fs/xfs/xfs_bmap_util.c
> > > +++ b/fs/xfs/xfs_bmap_util.c
> > > @@ -712,12 +712,11 @@ xfs_bmap_punch_delalloc_range(
> > >  	struct xfs_iext_cursor	icur;
> > >  	int			error = 0;
> > >  
> > > -	ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
> > > -
> > > +	xfs_ilock(ip, XFS_ILOCK_EXCL);
> > >  	if (!(ifp->if_flags & XFS_IFEXTENTS)) {
> > >  		error = xfs_iread_extents(NULL, ip, XFS_DATA_FORK);
> > >  		if (error)
> > > -			return error;
> > > +			goto out_unlock;
> > >  	}
> > >  
> > >  	if (!xfs_iext_lookup_extent_before(ip, ifp, &end_fsb, &icur, &got))
> > 
> > There's a return 0 just below here that needs the exit label treatment.
> > Otherwise looks Ok.
> 
> Will fix that in my tree for testing.  Brian, will you RVB the fixed up
> patch?
> 

Yep. With the locking fix:

Reviewed-by: Brian Foster <bfoster@redhat.com>

> --D
> 
> > Brian
> > 
> > > @@ -738,6 +737,8 @@ xfs_bmap_punch_delalloc_range(
> > >  		}
> > >  	}
> > >  
> > > +out_unlock:
> > > +	xfs_iunlock(ip, XFS_ILOCK_EXCL);
> > >  	return error;
> > >  }
> > >  
> > > diff --git a/fs/xfs/xfs_iomap.c b/fs/xfs/xfs_iomap.c
> > > index da6d1995e460..f949f0dd7382 100644
> > > --- a/fs/xfs/xfs_iomap.c
> > > +++ b/fs/xfs/xfs_iomap.c
> > > @@ -1203,11 +1203,8 @@ xfs_file_iomap_end_delalloc(
> > >  		truncate_pagecache_range(VFS_I(ip), XFS_FSB_TO_B(mp, start_fsb),
> > >  					 XFS_FSB_TO_B(mp, end_fsb) - 1);
> > >  
> > > -		xfs_ilock(ip, XFS_ILOCK_EXCL);
> > >  		error = xfs_bmap_punch_delalloc_range(ip, start_fsb,
> > >  					       end_fsb - start_fsb);
> > > -		xfs_iunlock(ip, XFS_ILOCK_EXCL);
> > > -
> > >  		if (error && !XFS_FORCED_SHUTDOWN(mp)) {
> > >  			xfs_alert(mp, "%s: unable to clean up ino %lld",
> > >  				__func__, ip->i_ino);
> > > -- 
> > > 2.17.0
> > > 
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