linux-ext4 - Re: [PATCH v2 5/5] dax: handle media errors in dax_do

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Date:	Tue, 26 Apr 2016 01:32:10 -0700
From:	"hch@...radead.org" <hch@...radead.org>
To:	Jeff Moyer <jmoyer@...hat.com>
Cc:	"hch@...radead.org" <hch@...radead.org>,
	"Verma, Vishal L" <vishal.l.verma@...el.com>,
	"axboe@...com" <axboe@...com>, "jack@...e.cz" <jack@...e.cz>,
	"linux-nvdimm@...1.01.org" <linux-nvdimm@...1.01.org>,
	"david@...morbit.com" <david@...morbit.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"xfs@....sgi.com" <xfs@....sgi.com>,
	"linux-block@...r.kernel.org" <linux-block@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"Wilcox, Matthew R" <matthew.r.wilcox@...el.com>,
	"linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>,
	"viro@...iv.linux.org.uk" <viro@...iv.linux.org.uk>
Subject: Re: [PATCH v2 5/5] dax: handle media errors in dax_do_io

On Mon, Apr 25, 2016 at 11:32:08AM -0400, Jeff Moyer wrote:
> > EINVAL is a concern here.  Not due to the right error reported, but
> > because it means your current scheme is fundamentally broken - we
> > need to support I/O at any alignment for DAX I/O, and not fail due to
> > alignbment concernes for a highly specific degraded case.
> >
> > I think this whole series need to go back to the drawing board as I
> > don't think it can actually rely on using direct I/O as the EIO
> > fallback.
> 
> The only callers of dax_do_io are direct_IO methods.

They are because the DAX I/O pass is a mess, but that doesn't mean
the user specific O_DIRECT on the open nessecarily.
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