On 10/24/2012 02:51 PM, Boaz Harrosh wrote:
>
> 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@xxxxxxxxxxx>
> Signed-off-by: Boaz Harrosh <bharrosh@xxxxxxxxxxx>
James hi.
This is for the next (v3.8) merge window. Please submit to scsi-misc tree.
It is actually a very old well tested, but forgotten patch.
Thanks
Boaz
> ---
> drivers/scsi/osd/osd_uld.c | 28 ++++++++++++++++++++++++++++
> 1 files changed, 28 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/scsi/osd/osd_uld.c b/drivers/scsi/osd/osd_uld.c
> index d4ed9eb..4375417 100644
> --- a/drivers/scsi/osd/osd_uld.c
> +++ b/drivers/scsi/osd/osd_uld.c
> @@ -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,
> };
>
> /*
>
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