Add support for multi-lun tape devices to the cciss driver.
Signed-off-by: Stephen M. Cameron <smcameron@xxxxxxxxxxxxxxxxxxxxxxx>
---
linux-2.6.24/drivers/block/cciss_scsi.c | 40 +++++++++++++++++++++++++++++---
1 files changed, 37 insertions(+), 3 deletions(-)
diff -puN linux-2.6.24/drivers/block/cciss_scsi.c~cciss_multilun_tape linux-2.6.24/drivers/block/cciss_scsi.c
--- kernel.org2/linux-2.6.24/drivers/block/cciss_scsi.c~cciss_multilun_tape 2008-02-04 07:52:48.000000000 -0600
+++ kernel.org2-root/linux-2.6.24/drivers/block/cciss_scsi.c 2008-02-04 07:52:48.000000000 -0600
@@ -371,16 +371,50 @@ cciss_scsi_add_entry(int ctlr, int hostn
/* assumes hba[ctlr]->scsi_ctlr->lock is held */
int n = ccissscsi[ctlr].ndevices;
struct cciss_scsi_dev_t *sd;
+ int i, bus, target, lun;
+ unsigned char addr1[8], addr2[8];
if (n >= CCISS_MAX_SCSI_DEVS_PER_HBA) {
printk("cciss%d: Too many devices, "
"some will be inaccessible.\n", ctlr);
return -1;
}
- sd = &ccissscsi[ctlr].dev[n];
- if (find_bus_target_lun(ctlr, &sd->bus, &sd->target, &sd->lun) != 0)
- return -1;
+ bus = target = -1;
+ lun = 0;
+ /* Is this device a non-zero lun of a multi-lun device */
+ /* byte 4 of the 8-byte LUN addr will contain the logical unit no. */
+ if (scsi3addr[4] != 0) {
+ /* Search through our list and find the device which */
+ /* has the same 8 byte LUN address, excepting byte 4. */
+ /* Assign the same bus and target for this new LUN. */
+ /* Use the logical unit number from the firmware. */
+ memcpy(addr1, scsi3addr, 8);
+ addr1[4] = 0;
+ for (i = 0; i < n; i++) {
+ sd = &ccissscsi[ctlr].dev[i];
+ memcpy(addr2, sd->scsi3addr, 8);
+ addr2[4] = 0;
+ /* differ only in byte 4? */
+ if (memcmp(addr1, addr2, 8) == 0) {
+ bus = sd->bus;
+ target = sd->target;
+ lun = scsi3addr[4];
+ break;
+ }
+ }
+ }
+
+ sd = &ccissscsi[ctlr].dev[n];
+ if (lun == 0) {
+ if (find_bus_target_lun(ctlr,
+ &sd->bus, &sd->target, &sd->lun) != 0)
+ return -1;
+ } else {
+ sd->bus = bus;
+ sd->target = target;
+ sd->lun = lun;
+ }
added[*nadded].bus = sd->bus;
added[*nadded].target = sd->target;
added[*nadded].lun = sd->lun;
_
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