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[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>
This commit is contained in:
Boaz Harrosh 2012-10-24 14:51:41 -07:00 committed by James Bottomley
parent afd5e34b2b
commit 51976a8c85
1 changed files with 28 additions and 0 deletions
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28
drivers/scsi/osd/osd_uld.c
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@ -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,
};
/*