Re: [PATCH 11/11] xfs: add media error reporting ioctl

["Darrick J. Wong" <djwong@kernel.org>]

On Wed, Jan 07, 2026 at 10:36:11AM +0100, Christoph Hellwig wrote:
> On Mon, Jan 05, 2026 at 11:13:29PM -0800, Darrick J. Wong wrote:
> > From: Darrick J. Wong <djwong@kernel.org>
> > 
> > Add a new privileged ioctl so that xfs_scrub can report the media errors
> > that it finds to the kernel for further processing.  Ideally this would
> > be done by the kernel, but the kernel doesn't (yet) support initiating
> > verification reads.
> 
> FYI, I'd much prefer adding the kernel support than relying in userspace
> doing it, which will be hard to move away from.

Hrm.  I wonder, does the block layer use iomap for directio?  Now that
the fserror reporting has been hooked up to iomap, I wonder if it's
possible for xfs_healer to listen for file IO errors on a block device?

Oh.  block/fops.c doesn't actually call iomap_dio_* so I guess that's
not yet possible.  Would it be easier to convert blockdevs to use iomap,
or should I bite the bullet and convert the legacy direct_IO code?

Or I guess one of us should go figure out a reasonable verify command
that would call fserror_* on media errors.

--D