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cciss: add support for multi lun tape devices 

This patch adds support for multi-lun devices in a SAS environment. It's
required for the support of media changers.

Signed-off-by: Stephen M. Cameron <scameron@beardog.cca.cpqcorp.net>
Signed-off-by: Mike Miller <mike.miller@hp.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
Mike Miller 2008-08-04 11:54:54 +02:00 committed by Jens Axboe
parent f4a93bcda7
commit 935dc8d757
1 changed files with 37 additions and 3 deletions
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40
drivers/block/cciss_scsi.c
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@ -371,16 +371,50 @@ cciss_scsi_add_entry(int ctlr, int hostno,
/* 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;