linux-kernel - Re: [RESEND PATCH v3 0/4] configfs: implement committable items and add sample code

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Date:   Wed, 13 Jan 2021 15:49:33 -0800
From:   Joel Becker <jlbec@...lplan.org>
To:     Bartosz Golaszewski <brgl@...ev.pl>
Cc:     Christoph Hellwig <hch@....de>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Kent Gibson <warthog618@...il.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>
Subject: Re: [RESEND PATCH v3 0/4] configfs: implement committable items and
 add sample code

On Mon, Jan 11, 2021 at 09:32:14AM +0100, Bartosz Golaszewski wrote:
> On Tue, Dec 29, 2020 at 11:22 AM Bartosz Golaszewski <brgl@...ev.pl> wrote:
> >
> > From: Bartosz Golaszewski <bgolaszewski@...libre.com>
> >
> > Committable items in configfs are well defined and documented but unfortunately
> > so far never implemented.
> >
> > The use-case we have over at the GPIO subsystem is using configfs in
> > conjunction with sysfs to replace our current gpio-mockup testing module
> > with one that will be much more flexible and will allow complete coverage
> > of the GPIO uAPI.
> >
> > The current gpio-mockup module is controlled using module parameters which
> > forces the user to reload it everytime they need to change the chip
> > configuration or layout and makes it difficult to extend its functionality.
> >
> > Testing module based on configfs would allow fine-grained control over dummy
> > GPIO chips but since GPIO devices must be configured before they are
> > instantiated, we need committable items.
> >
> > This implements them and adds code examples to configfs_sample module. The
> > first two patches are just cosmetic.
> >
> > v1 -> v2:
> > - fix a 'set but not used' build warning reported by kernel test robot
> >
> > v2 -> v3:
> > - use (1UL << bit) instead of BIT() in patch 2/4
> > - extend configfs_dump_one() to make it print the new flags
> > - clear the CONFIGFS_USET_DIR bit on the live group dirent
> >
> > Rebased on top of v5.11-rc1.
> >
> > Bartosz Golaszewski (4):
> >   configfs: increase the item name length
> >   configfs: use (1UL << bit) for internal flags
> >   configfs: implement committable items
> >   samples: configfs: add a committable group
> >
> >  Documentation/filesystems/configfs.rst |   6 +-
> >  fs/configfs/configfs_internal.h        |  22 +--
> >  fs/configfs/dir.c                      | 240 ++++++++++++++++++++++++-
> >  fs/configfs/file.c                     |   8 +
> >  include/linux/configfs.h               |   3 +-
> >  samples/configfs/configfs_sample.c     | 150 ++++++++++++++++
> >  6 files changed, 409 insertions(+), 20 deletions(-)
> >
> > --
> > 2.29.1
> >
> 
> Joel, Christoph,
> 
> This series in its current form has been on the list for many weeks.
> Are there any objections from your side against merging it for v5.12?

Hey Bartosz,

I don't have much time for code reviews these days (you can see my
lack of mailing list stats), so I only saw your series today.  I
accidentally reviewed the first version, but my comments there still
stand.  Overall, I'm very happy to see this implemented.

Thanks,
Joel

-- 

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 It's the heart that matters more."

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			jlbec@...lplan.org