linux-kernel - Re: [PATCH v4 5/5] xfs: disable map

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Date:   Thu, 4 Apr 2019 06:52:16 -0400 (EDT)
From:   Pankaj Gupta <pagupta@...hat.com>
To:     Adam Borowski <kilobyte@...band.pl>
Cc:     Dave Chinner <david@...morbit.com>,
        darrick wong <darrick.wong@...cle.com>,
        linux-nvdimm@...ts.01.org, linux-kernel@...r.kernel.org,
        virtualization@...ts.linux-foundation.org, kvm@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-acpi@...r.kernel.org,
        qemu-devel@...gnu.org, linux-ext4@...r.kernel.org,
        linux-xfs@...r.kernel.org,
        dan j williams <dan.j.williams@...el.com>,
        zwisler@...nel.org, vishal l verma <vishal.l.verma@...el.com>,
        dave jiang <dave.jiang@...el.com>, mst@...hat.com,
        jasowang@...hat.com, willy@...radead.org, rjw@...ysocki.net,
        hch@...radead.org, lenb@...nel.org, jack@...e.cz, tytso@....edu,
        adilger kernel <adilger.kernel@...ger.ca>,
        lcapitulino@...hat.com, kwolf@...hat.com, imammedo@...hat.com,
        jmoyer@...hat.com, nilal@...hat.com, riel@...riel.com,
        stefanha@...hat.com, aarcange@...hat.com, david@...hat.com,
        cohuck@...hat.com,
        xiaoguangrong eric <xiaoguangrong.eric@...il.com>
Subject: Re: [PATCH v4 5/5] xfs: disable map_sync for async flush


> 
> On Thu, Apr 04, 2019 at 02:12:30AM -0400, Pankaj Gupta wrote:
> > > All this ad hoc IS_DAX conditional logic is getting pretty nasty.
> > > 
> > > xfs_file_mmap(
> > > ....
> > > {
> > > 	struct inode	*inode = file_inode(filp);
> > > 
> > > 	if (vma->vm_flags & VM_SYNC) {
> > > 		if (!IS_DAX(inode))
> > > 			return -EOPNOTSUPP;
> > > 		if (!dax_synchronous(xfs_find_daxdev_for_inode(inode))
> > > 			return -EOPNOTSUPP;
> > > 	}
> > > 
> > > 	file_accessed(filp);
> > > 	vma->vm_ops = &xfs_file_vm_ops;
> > > 	if (IS_DAX(inode))
> > > 		vma->vm_flags |= VM_HUGEPAGE;
> > > 	return 0;
> > > }
> > 
> > Sure, this is better.
> 
> > > Even better, factor out all the "MAP_SYNC supported" checks into a
> > > helper so that the filesystem code just doesn't have to care about
> > > the details of checking for DAX+MAP_SYNC support....
> > 
> > o.k. Will add one common helper function for both ext4 & xfs filesystems.
> 
> Note this pending patch for Goldwyn Rodrigues' patchset for btrfs:
> 
> https://lore.kernel.org/linux-btrfs/20190328102418.5466-1-kilobyte@angband.pl/
> 
> We might want to coordinate.

Sure. Good to know.

Thanks for the pointer. Will have a look.

Best regards,
Pankaj 

> 
> 
> Meow!
> --
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> ⢿⡄⠘⠷⠚⠋⠀ will make your testsuite pass much faster, and fix bugs?
> ⠈⠳⣄⠀⠀⠀⠀
>