From 935dc8d7575e6c1292b057e39045a40f1fbe26e7 Mon Sep 17 00:00:00 2001 From: Mike Miller Date: Mon, 4 Aug 2008 11:54:54 +0200 Subject: [PATCH] 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 Signed-off-by: Mike Miller Signed-off-by: Jens Axboe --- drivers/block/cciss_scsi.c | 40 +++++++++++++++++++++++++++++++++++--- 1 file changed, 37 insertions(+), 3 deletions(-) diff --git a/drivers/block/cciss_scsi.c b/drivers/block/cciss_scsi.c index c673ff1412..e1233aabda 100644 --- a/drivers/block/cciss_scsi.c +++ b/drivers/block/cciss_scsi.c @@ -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; -- 2.39.5