netdev - Re: [PATCH net-next 09/19] vfio/mdev: Expose mdev alias in sysfs tree

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Message-ID: <20191108181608.GV6990@nanopsycho>
Date:   Fri, 8 Nov 2019 19:16:08 +0100
From:   Jiri Pirko <jiri@...nulli.us>
To:     Alex Williamson <alex.williamson@...hat.com>
Cc:     Parav Pandit <parav@...lanox.com>, davem@...emloft.net,
        kvm@...r.kernel.org, netdev@...r.kernel.org, saeedm@...lanox.com,
        kwankhede@...dia.com, leon@...nel.org, cohuck@...hat.com,
        jiri@...lanox.com, linux-rdma@...r.kernel.org
Subject: Re: [PATCH net-next 09/19] vfio/mdev: Expose mdev alias in sysfs tree

Fri, Nov 08, 2019 at 07:03:55PM CET, alex.williamson@...hat.com wrote:
>On Fri, 8 Nov 2019 14:22:30 +0100
>Jiri Pirko <jiri@...nulli.us> wrote:
>
>> Thu, Nov 07, 2019 at 05:08:24PM CET, parav@...lanox.com wrote:
>> 
>> [...]
>> 
>> > 
>> >+static ssize_t alias_show(struct device *device,
>> >+			  struct device_attribute *attr, char *buf)
>> >+{
>> >+	struct mdev_device *dev = mdev_from_dev(device);
>> >+
>> >+	if (!dev->alias)
>> >+		return -EOPNOTSUPP;
>> >+
>> >+	return sprintf(buf, "%s\n", dev->alias);
>> >+}
>> >+static DEVICE_ATTR_RO(alias);  
>> 
>> I wonder, rather than adding another sysfs file, why the alias can't be
>> simply a symlink to the aliased mdev directory?
>
>The user doesn't know the alias in advance, it seems problematic to
>assume an arbitrarily named link is the alias.  Thanks,

Why the user have to know in advance?


>
>Alex
>
>> >+
>> > static const struct attribute *mdev_device_attrs[] = {
>> >+	&dev_attr_alias.attr,
>> > 	&dev_attr_remove.attr,
>> > 	NULL,
>> > };
>> >-- 
>> >2.19.2
>> >  
>