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Groups > linux.kernel > #1380013
| From | "Verma, Vishal L" <vishal.l.verma@intel.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: [PATCH v2 5/5] dax: handle media errors in dax_do_io |
| Date | 2016-04-15 19:00 +0200 |
| Message-ID | <rofg7-67R-27@gated-at.bofh.it> (permalink) |
| References | <ridK1-6VB-1@gated-at.bofh.it> <ridK2-6VB-17@gated-at.bofh.it> <roeDn-5Pa-9@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
On Fri, 2016-04-15 at 12:11 -0400, Jeff Moyer wrote:
> Vishal Verma <vishal.l.verma@intel.com> writes:
>
> >
> > dax_do_io (called for read() or write() for a dax file system) may
> > fail
> > in the presence of bad blocks or media errors. Since we expect that
> > a
> > write should clear media errors on nvdimms, make dax_do_io fall
> > back to
> > the direct_IO path, which will send down a bio to the driver, which
> > can
> > then attempt to clear the error.
> [snip]
>
> >
> > + if (IS_DAX(inode)) {
> > + ret = dax_do_io(iocb, inode, iter, offset,
> > blkdev_get_block,
> > NULL, DIO_SKIP_DIO_COUNT);
> > - return __blockdev_direct_IO(iocb, inode, I_BDEV(inode),
> > iter, offset,
> > + if (ret == -EIO && (iov_iter_rw(iter) == WRITE))
> > + ret_saved = ret;
> > + else
> > + return ret;
> > + }
> > +
> > + ret = __blockdev_direct_IO(iocb, inode, I_BDEV(inode),
> > iter, offset,
> > blkdev_get_block, NULL, NULL,
> > DIO_SKIP_DIO_COUNT);
> > + if (ret < 0 && ret_saved)
> > + return ret_saved;
> > +
> Hmm, did you just break async DIO? I think you did! :)
> __blockdev_direct_IO can return -EIOCBQUEUED, and you've now turned
> that
> into -EIO. Really, I don't see a reason to save that first
> -EIO. The
> same applies to all instances in this patch.
The reason I saved it was if __blockdev_direct_IO fails for some
reason, we should return the original cause o the error, which was an
EIO.. i.e. we shouldn't be hiding the EIO if the direct_IO fails with
something else..
But, how does _EIOCBQUEUED work? Maybe we need an exception for it?
Thanks,
-Vishal
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Re: [PATCH v2 5/5] dax: handle media errors in dax_do_io Jeff Moyer <jmoyer@redhat.com> - 2016-04-15 18:20 +0200
Re: [PATCH v2 5/5] dax: handle media errors in dax_do_io "Verma, Vishal L" <vishal.l.verma@intel.com> - 2016-04-15 19:00 +0200
Re: [PATCH v2 5/5] dax: handle media errors in dax_do_io Jeff Moyer <jmoyer@redhat.com> - 2016-04-15 19:20 +0200
Re: [PATCH v2 5/5] dax: handle media errors in dax_do_io "Verma, Vishal L" <vishal.l.verma@intel.com> - 2016-04-15 19:40 +0200
Re: [PATCH v2 5/5] dax: handle media errors in dax_do_io Dan Williams <dan.j.williams@intel.com> - 2016-04-15 20:00 +0200
Re: [PATCH v2 5/5] dax: handle media errors in dax_do_io Jeff Moyer <jmoyer@redhat.com> - 2016-04-15 20:10 +0200
Re: [PATCH v2 5/5] dax: handle media errors in dax_do_io Dan Williams <dan.j.williams@intel.com> - 2016-04-15 20:20 +0200
Re: [PATCH v2 5/5] dax: handle media errors in dax_do_io Jeff Moyer <jmoyer@redhat.com> - 2016-04-15 20:30 +0200
Re: [PATCH v2 5/5] dax: handle media errors in dax_do_io Dan Williams <dan.j.williams@intel.com> - 2016-04-15 21:00 +0200
Re: [PATCH v2 5/5] dax: handle media errors in dax_do_io Jeff Moyer <jmoyer@redhat.com> - 2016-04-15 21:20 +0200
Re: [PATCH v2 5/5] dax: handle media errors in dax_do_io Toshi Kani <toshi.kani@hpe.com> - 2016-04-15 21:20 +0200
Re: [PATCH v2 5/5] dax: handle media errors in dax_do_io Toshi Kani <toshi.kani@hpe.com> - 2016-04-15 21:40 +0200
Re: [PATCH v2 5/5] dax: handle media errors in dax_do_io Christoph Hellwig <hch@infradead.org> - 2016-04-20 23:00 +0200
Re: [PATCH v2 5/5] dax: handle media errors in dax_do_io "Verma, Vishal L" <vishal.l.verma@intel.com> - 2016-04-23 20:10 +0200
Re: [PATCH v2 5/5] dax: handle media errors in dax_do_io "hch@infradead.org" <hch@infradead.org> - 2016-04-25 10:40 +0200
Re: [PATCH v2 5/5] dax: handle media errors in dax_do_io Jeff Moyer <jmoyer@redhat.com> - 2016-04-25 17:40 +0200
Re: [PATCH v2 5/5] dax: handle media errors in dax_do_io "hch@infradead.org" <hch@infradead.org> - 2016-04-26 10:40 +0200
Re: [PATCH v2 5/5] dax: handle media errors in dax_do_io "Verma, Vishal L" <vishal.l.verma@intel.com> - 2016-04-25 19:20 +0200
Re: [PATCH v2 5/5] dax: handle media errors in dax_do_io Dan Williams <dan.j.williams@intel.com> - 2016-04-25 19:30 +0200
Re: [PATCH v2 5/5] dax: handle media errors in dax_do_io Dave Chinner <david@fromorbit.com> - 2016-04-26 01:30 +0200
Re: [PATCH v2 5/5] dax: handle media errors in dax_do_io "Darrick J. Wong" <darrick.wong@oracle.com> - 2016-04-26 01:40 +0200
Re: [PATCH v2 5/5] dax: handle media errors in dax_do_io Dan Williams <dan.j.williams@intel.com> - 2016-04-26 01:50 +0200
Re: [PATCH v2 5/5] dax: handle media errors in dax_do_io Dave Chinner <david@fromorbit.com> - 2016-04-26 02:20 +0200
Re: [PATCH v2 5/5] dax: handle media errors in dax_do_io Dan Williams <dan.j.williams@intel.com> - 2016-04-26 03:50 +0200
Re: [PATCH v2 5/5] dax: handle media errors in dax_do_io Dave Chinner <david@fromorbit.com> - 2016-04-26 05:00 +0200
Re: [PATCH v2 5/5] dax: handle media errors in dax_do_io Dan Williams <dan.j.williams@intel.com> - 2016-04-26 06:20 +0200
Re: [PATCH v2 5/5] dax: handle media errors in dax_do_io Dave Chinner <david@fromorbit.com> - 2016-04-26 10:30 +0200
Re: [PATCH v2 5/5] dax: handle media errors in dax_do_io Dan Williams <dan.j.williams@intel.com> - 2016-04-26 17:00 +0200
Re: [PATCH v2 5/5] dax: handle media errors in dax_do_io Jan Kara <jack@suse.cz> - 2016-04-26 17:40 +0200
Re: [PATCH v2 5/5] dax: handle media errors in dax_do_io Dan Williams <dan.j.williams@intel.com> - 2016-04-26 19:20 +0200
Re: [PATCH v2 5/5] dax: handle media errors in dax_do_io "Verma, Vishal L" <vishal.l.verma@intel.com> - 2016-04-26 02:00 +0200
Re: [PATCH v2 5/5] dax: handle media errors in dax_do_io Dave Chinner <david@fromorbit.com> - 2016-04-26 02:50 +0200
Re: [PATCH v2 5/5] dax: handle media errors in dax_do_io Vishal Verma <vishal@kernel.org> - 2016-04-26 17:00 +0200
Re: [PATCH v2 5/5] dax: handle media errors in dax_do_io "hch@infradead.org" <hch@infradead.org> - 2016-04-26 10:40 +0200
Re: [PATCH v2 5/5] dax: handle media errors in dax_do_io Vishal Verma <vishal@kernel.org> - 2016-04-26 17:10 +0200
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