linux-kernel - Re: [PATCH v3 5/7] selftests: add memfd/sealing page-pinning tests

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Date:	Wed, 16 Jul 2014 03:08:31 -0700 (PDT)
From:	Hugh Dickins <hughd@...gle.com>
To:	David Herrmann <dh.herrmann@...il.com>
cc:	linux-kernel@...r.kernel.org,
	Michael Kerrisk <mtk.manpages@...il.com>,
	Ryan Lortie <desrt@...rt.ca>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
	linux-fsdevel@...r.kernel.org, linux-api@...r.kernel.org,
	Greg Kroah-Hartman <greg@...ah.com>, john.stultz@...aro.org,
	Lennart Poettering <lennart@...ttering.net>,
	Daniel Mack <zonque@...il.com>, Kay Sievers <kay@...y.org>,
	Hugh Dickins <hughd@...gle.com>,
	Tony Battersby <tonyb@...ernetics.com>,
	Andy Lutomirski <luto@...capital.net>
Subject: Re: [PATCH v3 5/7] selftests: add memfd/sealing page-pinning tests

On Fri, 13 Jun 2014, David Herrmann wrote:

> Setting SEAL_WRITE is not possible if there're pending GUP users. This
> commit adds selftests for memfd+sealing that use FUSE to create pending
> page-references. FUSE is very helpful here in that it allows us to delay
> direct-IO operations for an arbitrary amount of time. This way, we can
> force the kernel to pin pages and then run our normal selftests.
> 
> Signed-off-by: David Herrmann <dh.herrmann@...il.com>

I had a number of problems in getting this working (on openSUSE 13.1):
rpm told me I had fuse installed, yet I had to download and install
the tarball to get header files needed; then "make fuse_mnt" told me
to add -D_FILE_OFFSET_BITS=64 to the compile flags; after which I
got "undefined reference to `fuse_main_real'"; but then I tried
"make run_fuse" as root, and it seemed to sort these issues out
for itself, aside from "./run_fuse_test.sh: Permission denied" -
which was within my bounds of comprehension unlike the rest!

No complaint, thanks for providing the test (though I didn't check
the source to convince myself that "DONE" has done what's claimed):
some rainy day someone can get the Makefile working more smoothly,
no need to delay the patchset for this.

Hugh
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