linux-kernel - Re: [PATCH v2 3/3] xfs: Add alignment check for DAX mount

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Date:	Thu, 5 May 2016 10:03:46 +0200
From:	Jan Kara <jack@...e.cz>
To:	Toshi Kani <toshi.kani@....com>
Cc:	Dave Chinner <david@...morbit.com>, dan.j.williams@...el.com,
	jack@...e.cz, hch@...radead.org, boaz@...xistor.com, tytso@....edu,
	adilger.kernel@...ger.ca, ross.zwisler@...ux.intel.com,
	micah.parrish@....com, linux-nvdimm@...ts.01.org,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 3/3] xfs: Add alignment check for DAX mount

On Wed 04-05-16 17:41:26, Toshi Kani wrote:
> On Thu, 2016-05-05 at 09:18 +1000, Dave Chinner wrote:
> > On Mon, May 02, 2016 at 12:42:58PM -0600, Toshi Kani wrote:
> > > 
> :
> > Please write a helper along the lines of:
> > 
> > 	error = blkdev_supports_dax(sb->s_bdev, sb->s_blocksize);
> > 
> > and encapsulate all this, including the specific error messages in the
> > helper (i.e. "Block device %s does not support DAX."). Then the rest
> > of the filesystem code looks something like this:
> > 
> > 	if (mp->m_flags & XFS_MOUNT_DAX) {
> > 		error = blkdev_supports_dax(sb->s_bdev, sb->s_blocksize);
> > 		if (error) {
> > 			xfs_alert(mp,
> > 		"DAX unsupported by block device. Turning off DAX.");
> > 			mp->m_flags &= ~XFS_MOUNT_DAX;
> > 		}
> > 	}
> > 
> > And each filesystem can choose to do what it wants with the error
> > without having to care exactly why DAX is not supported.
> 
> Yes, I had this change in mind and was wondering if you are OK with it
> since I am incline to keep the ext2/4 message style as majority rule. :)
> https://lkml.org/lkml/2016/5/3/543
> 
> Assuming that's OK, I will make this change.

Yeah, just send me ext2 changes on top of your v2 and I can pull it to my
tree.


								Honza
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR