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[94.113.220.175]) by smtp.gmail.com with ESMTPSA id x9sm6458681wru.32.2019.11.08.10.16.08 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 08 Nov 2019 10:16:09 -0800 (PST) Date: Fri, 8 Nov 2019 19:16:08 +0100 From: Jiri Pirko To: Alex Williamson Cc: Parav Pandit , davem@davemloft.net, kvm@vger.kernel.org, netdev@vger.kernel.org, saeedm@mellanox.com, kwankhede@nvidia.com, leon@kernel.org, cohuck@redhat.com, jiri@mellanox.com, linux-rdma@vger.kernel.org Subject: Re: [PATCH net-next 09/19] vfio/mdev: Expose mdev alias in sysfs tree Message-ID: <20191108181608.GV6990@nanopsycho> References: <20191107160448.20962-1-parav@mellanox.com> <20191107160834.21087-1-parav@mellanox.com> <20191107160834.21087-9-parav@mellanox.com> <20191108132230.GK6990@nanopsycho> <20191108110355.77128e6f@x1.home> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20191108110355.77128e6f@x1.home> User-Agent: Mutt/1.12.1 (2019-06-15) Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org Fri, Nov 08, 2019 at 07:03:55PM CET, alex.williamson@redhat.com wrote: >On Fri, 8 Nov 2019 14:22:30 +0100 >Jiri Pirko wrote: > >> Thu, Nov 07, 2019 at 05:08:24PM CET, parav@mellanox.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 >> > >