On Fri, May 6, 2016 at 7:40 AM, Douglas Gilbert <[email protected]> wrote:
> Permit changing of a LU name from a (fake) IEEE registered NAA (5)
> to a locally assigned UUID. Using a UUID (RFC 4122) for a SCSI
> designation descriptor (e.g. a LU name) was added in spc5r08.pdf
> (a draft INCITS standard) on 25 January 2016. Add parameter
> uuid_ctl to use a separate UUID for each LU (storage device) name.
> Additional option for all LU names to have the same UUID (since
> their storage is shared). Previous action of using NAA identifier
> for LU name remains the default.
> @@ -3503,6 +3520,9 @@ static void sdebug_q_cmd_wq_complete(struct work_struct
> *work)
> sdebug_q_cmd_complete(sd_dp);
> }
>
> +static bool got_shared_uuid;
> +static uuid_be shared_uuid;
So, the assignment to them is non-atomic, is it a problem here?
> @@ -3510,6 +3530,17 @@ static struct sdebug_dev_info *sdebug_device_create(
>
> devip = kzalloc(sizeof(*devip), flags);
> if (devip) {
> + if (sdebug_uuid_ctl == 1)
> + uuid_be_gen(&devip->lu_name);
> + else if (sdebug_uuid_ctl == 2) {
> + if (got_shared_uuid)
> + devip->lu_name = shared_uuid;
> + else {
> + uuid_be_gen(&shared_uuid);
> + got_shared_uuid = true;
> + devip->lu_name = shared_uuid;
> + }
> + }
Perhaps
if (got_shared_uuid == false)
uuid_be_gen(&shared_uuid);
got_shared_uuid = true;
}
devip->lu_name = shared_uuid;
> devip->sdbg_host = sdbg_host;
> list_add_tail(&devip->dev_list, &sdbg_host->dev_info_list);
> }
> @@ -4150,6 +4182,8 @@ MODULE_PARM_DESC(unmap_alignment, "lowest aligned thin
> provisioning lba (def=0)"
> MODULE_PARM_DESC(unmap_granularity, "thin provisioning granularity in blocks
> (def=1)");
> MODULE_PARM_DESC(unmap_max_blocks, "max # of blocks can be unmapped in one
> cmd (def=0xffffffff)");
> MODULE_PARM_DESC(unmap_max_desc, "max # of ranges that can be unmapped in
> one cmd (def=256)");
> +MODULE_PARM_DESC(uuid_ctl,
> + "1->use uuid for lu name, 0->don't, 2->all use same
> (def=0)");
Why not on one line?
> MODULE_PARM_DESC(virtual_gb, "virtual gigabyte (GiB) size (def=0 -> use
> dev_size_mb)");
> MODULE_PARM_DESC(vpd_use_hostno, "0 -> dev ids ignore hostno (def=1 ->
> unique dev ids)");
> MODULE_PARM_DESC(write_same_length, "Maximum blocks per WRITE SAME cmd
> (def=0xffff)");
> @@ -4787,6 +4821,12 @@ static ssize_t strict_store(struct device_driver *ddp,
> const char *buf,
> }
> static DRIVER_ATTR_RW(strict);
>
> +static ssize_t uuid_ctl_show(struct device_driver *ddp, char *buf)
> +{
> + return scnprintf(buf, PAGE_SIZE, "%d\n", !!sdebug_uuid_ctl);
It will never show the difference between 1 and 2. Was it on purpose?
> +}
> +static DRIVER_ATTR_RO(uuid_ctl);
--
With Best Regards,
Andy Shevchenko
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