linux-kernel - Re: [PATCH v3] libnvdimm, region: sysfs trigger for nvdimm

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Message-ID: <x491ssdprf6.fsf@segfault.boston.devel.redhat.com>
Date:   Thu, 27 Apr 2017 15:43:41 -0400
From:   Jeff Moyer <jmoyer@...hat.com>
To:     Dan Williams <dan.j.williams@...el.com>
Cc:     "linux-nvdimm\@lists.01.org" <linux-nvdimm@...ts.01.org>,
        Masayoshi Mizuma <m.mizuma@...fujitsu.com>,
        Linux ACPI <linux-acpi@...r.kernel.org>,
        "linux-kernel\@vger.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3] libnvdimm, region: sysfs trigger for nvdimm_flush()

Dan Williams <dan.j.williams@...el.com> writes:

> We also still seem to need a discovery mechanism as I've had questions
> about "how do I tell if my system supports deep flush?". That's where
> sysfs is much better than an ioctl. The need for deep flush discovery
> tips the scales, at least for me, to also do deep flush triggering
> through the same interface.

Return ENXIO or EOPNOTSUPP from the ioctl when it isn't supported?

Cheers,
Jeff