Re: [PATCH 0/7] Enable UFS provisioning via Linux

From: Bart Van Assche <Bart.VanAssche@wdc.com>
To: "evgreen@chromium.org" <evgreen@chromium.org>,
	Stanislav Nijnikov <Stanislav.Nijnikov@wdc.com>
Cc: "vinholikatti@gmail.com" <vinholikatti@gmail.com>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"martin.petersen@oracle.com" <martin.petersen@oracle.com>,
	Avri Altman <Avri.Altman@wdc.com>,
	"linux-scsi@vger.kernel.org" <linux-scsi@vger.kernel.org>,
	Alex Lemberg <Alex.Lemberg@wdc.com>,
	"jejb@linux.vnet.ibm.com" <jejb@linux.vnet.ibm.com>,
	"adrian.hunter@intel.com" <adrian.hunter@intel.com>,
	"gwendal@chromium.org" <gwendal@chromium.org>
Subject: Re: [PATCH 0/7] Enable UFS provisioning via Linux
Date: Tue, 12 Jun 2018 20:11:18 +0000	[thread overview]
Message-ID: <d8035c8092a9401a766977a423c3f02c9c460ec5.camel@wdc.com> (raw)
In-Reply-To: <CAE=gft4LRtYJH1DStr6F6iK7q+TMA3RDPhft=A_AFyKpFmyS5w@mail.gmail.com>

On Tue, 2018-06-12 at 12:42 -0700, Evan Green wrote:
> What I _want_ to do is basically create N sysfs groups, where each
> group points to the same array of attributes. Then in the show/store
> methods, look up which group I'm in and use that as an index. But the
> show/store functions only pass the attributes themselves, and there
> seems to be no way for me to get the parent node.

The first argument that is passed to sysfs show and store methods is
a kobject pointer. Have you considered to access kobject.parent from
inside the show/store methods? From fs/sysfs/file.c:

	if (ops->show) {
		count = ops->show(kobj, of->kn->priv, buf);
		if (count < 0)
			return count;
	}

Bart.