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

[Christoph Hellwig <hch@lst.de>]

On Wed, Jan 07, 2026 at 08:30:35AM -0800, Darrick J. Wong wrote:
> > 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?

The block code basically has it's own simplified copy of the iomap
direct I/O code.

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

Hmm, I would expect the verify command to be issued by fs/xfs/scrub/
in the kernel, so that it can be directly tied into the in-kernel
logical to physical and rmap.  But you are more well versed there,
so maybe I'm missing something.