Commit 51976a8c authored Oct 24, 2012 by Boaz Harrosh Committed by James Bottomley Nov 27, 2012

[SCSI] osd_uld: Add osdname & systemid sysfs at scsi_osd class



This patch adds the support for the following two read-only sysfs attributes
to scsi_osd class members : osdname & systemid

These attributes will show up as below in sysfs class hierarchy:
/sys/class/scsi_osd/osdX/osdname
/sys/class/scsi_osd/osdX/systemid

The osdname & systemid are OSD device attributes which uniquely
identify a device on the network, while it's IP and certainly
it's /dev/osdX device path might change.
Userspace utilities (e.g. mkfs.exofs) can parse these attributes to
identify the correct OSD in safer and faster way.

(Today osd apps open each device in the system and send a
 attributes query for these, in order to access the user
 requested device)

Signed-off-by: Sachin Bhamare <sbhamare@panasas.com>
Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

parent afd5e34b

drivers/scsi/osd/osd_uld.c

+28 −0

Original line number	Diff line number	Diff line
		@@ -97,9 +97,37 @@ struct osd_dev_handle {

		static DEFINE_IDA(osd_minor_ida);

		/*
		* scsi sysfs attribute operations
		*/
		static ssize_t osdname_show(struct device dev, struct device_attribute attr,
		char *buf)
		{
		struct osd_uld_device *ould = container_of(dev, struct osd_uld_device,
		class_dev);
		return sprintf(buf, "%s\n", ould->odi.osdname);
		}

		static ssize_t systemid_show(struct device dev, struct device_attribute attr,
		char *buf)
		{
		struct osd_uld_device *ould = container_of(dev, struct osd_uld_device,
		class_dev);

		memcpy(buf, ould->odi.systemid, ould->odi.systemid_len);
		return ould->odi.systemid_len;
		}

		static struct device_attribute osd_uld_attrs[] = {
		__ATTR(osdname, S_IRUGO, osdname_show, NULL),
		__ATTR(systemid, S_IRUGO, systemid_show, NULL),
		__ATTR_NULL,
		};

		static struct class osd_uld_class = {
		.owner = THIS_MODULE,
		.name = "scsi_osd",
		.dev_attrs = osd_uld_attrs,
		};

		/*