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cciss: Fix cciss SCSI rescan code to better notice device changes
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Fix cciss SCSI rescan code to better notice device changes.
If you hot-unplug a tape drive, then hot-plug a different
tape drive into the same slot in a storage enclosure,
the cciss driver wouldn't notice anything had changed, as
it was only looking at the LUN address and device type.
Now it looks at the inquiry page 0x83 device identifier,
and vendor and model strings as well.

Signed-off-by: Stephen M. Cameron <scameron@beardog.cca.cpqcorp.net>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
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scameron@beardog.cca.cpqcorp.net authored and Jens Axboe committed Oct 9, 2008
1 parent 79eb014 commit 905bd78
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Showing 2 changed files with 102 additions and 53 deletions.
151 changes: 98 additions & 53 deletions drivers/block/cciss_scsi.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -365,7 +365,7 @@ struct scsi2map {

static int
cciss_scsi_add_entry(int ctlr, int hostno,
unsigned char *scsi3addr, int devtype,
struct cciss_scsi_dev_t *device,
struct scsi2map *added, int *nadded)
{
/* assumes hba[ctlr]->scsi_ctlr->lock is held */
Expand All @@ -384,12 +384,12 @@ cciss_scsi_add_entry(int ctlr, int hostno,
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) {
if (device->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);
memcpy(addr1, device->scsi3addr, 8);
addr1[4] = 0;
for (i = 0; i < n; i++) {
sd = &ccissscsi[ctlr].dev[i];
Expand All @@ -399,7 +399,7 @@ cciss_scsi_add_entry(int ctlr, int hostno,
if (memcmp(addr1, addr2, 8) == 0) {
bus = sd->bus;
target = sd->target;
lun = scsi3addr[4];
lun = device->scsi3addr[4];
break;
}
}
Expand All @@ -420,8 +420,12 @@ cciss_scsi_add_entry(int ctlr, int hostno,
added[*nadded].lun = sd->lun;
(*nadded)++;

memcpy(&sd->scsi3addr[0], scsi3addr, 8);
sd->devtype = devtype;
memcpy(sd->scsi3addr, device->scsi3addr, 8);
memcpy(sd->vendor, device->vendor, sizeof(sd->vendor));
memcpy(sd->revision, device->revision, sizeof(sd->revision));
memcpy(sd->device_id, device->device_id, sizeof(sd->device_id));
sd->devtype = device->devtype;

ccissscsi[ctlr].ndevices++;

/* initially, (before registering with scsi layer) we don't
Expand Down Expand Up @@ -487,6 +491,22 @@ static void fixup_botched_add(int ctlr, char *scsi3addr)
CPQ_TAPE_UNLOCK(ctlr, flags);
}

static int device_is_the_same(struct cciss_scsi_dev_t *dev1,
struct cciss_scsi_dev_t *dev2)
{
return dev1->devtype == dev2->devtype &&
memcmp(dev1->scsi3addr, dev2->scsi3addr,
sizeof(dev1->scsi3addr)) == 0 &&
memcmp(dev1->device_id, dev2->device_id,
sizeof(dev1->device_id)) == 0 &&
memcmp(dev1->vendor, dev2->vendor,
sizeof(dev1->vendor)) == 0 &&
memcmp(dev1->model, dev2->model,
sizeof(dev1->model)) == 0 &&
memcmp(dev1->revision, dev2->revision,
sizeof(dev1->revision)) == 0;
}

static int
adjust_cciss_scsi_table(int ctlr, int hostno,
struct cciss_scsi_dev_t sd[], int nsds)
Expand Down Expand Up @@ -532,7 +552,7 @@ adjust_cciss_scsi_table(int ctlr, int hostno,
for (j=0;j<nsds;j++) {
if (SCSI3ADDR_EQ(sd[j].scsi3addr,
csd->scsi3addr)) {
if (sd[j].devtype == csd->devtype)
if (device_is_the_same(&sd[j], csd))
found=2;
else
found=1;
Expand All @@ -548,22 +568,26 @@ adjust_cciss_scsi_table(int ctlr, int hostno,
cciss_scsi_remove_entry(ctlr, hostno, i,
removed, &nremoved);
/* remove ^^^, hence i not incremented */
}
else if (found == 1) { /* device is different kind */
} else if (found == 1) { /* device is different in some way */
changes++;
printk("cciss%d: device c%db%dt%dl%d type changed "
"(device type now %s).\n",
ctlr, hostno, csd->bus, csd->target, csd->lun,
scsi_device_type(csd->devtype));
printk("cciss%d: device c%db%dt%dl%d has changed.\n",
ctlr, hostno, csd->bus, csd->target, csd->lun);
cciss_scsi_remove_entry(ctlr, hostno, i,
removed, &nremoved);
/* remove ^^^, hence i not incremented */
if (cciss_scsi_add_entry(ctlr, hostno,
&sd[j].scsi3addr[0], sd[j].devtype,
if (cciss_scsi_add_entry(ctlr, hostno, &sd[j],
added, &nadded) != 0)
/* we just removed one, so add can't fail. */
BUG();
csd->devtype = sd[j].devtype;
memcpy(csd->device_id, sd[j].device_id,
sizeof(csd->device_id));
memcpy(csd->vendor, sd[j].vendor,
sizeof(csd->vendor));
memcpy(csd->model, sd[j].model,
sizeof(csd->model));
memcpy(csd->revision, sd[j].revision,
sizeof(csd->revision));
} else /* device is same as it ever was, */
i++; /* so just move along. */
}
Expand All @@ -577,7 +601,7 @@ adjust_cciss_scsi_table(int ctlr, int hostno,
csd = &ccissscsi[ctlr].dev[j];
if (SCSI3ADDR_EQ(sd[i].scsi3addr,
csd->scsi3addr)) {
if (sd[i].devtype == csd->devtype)
if (device_is_the_same(&sd[i], csd))
found=2; /* found device */
else
found=1; /* found a bug. */
Expand All @@ -586,16 +610,14 @@ adjust_cciss_scsi_table(int ctlr, int hostno,
}
if (!found) {
changes++;
if (cciss_scsi_add_entry(ctlr, hostno,

&sd[i].scsi3addr[0], sd[i].devtype,
if (cciss_scsi_add_entry(ctlr, hostno, &sd[i],
added, &nadded) != 0)
break;
} else if (found == 1) {
/* should never happen... */
changes++;
printk("cciss%d: device unexpectedly changed type\n",
ctlr);
printk(KERN_WARNING "cciss%d: device "
"unexpectedly changed\n", ctlr);
/* but if it does happen, we just ignore that device */
}
}
Expand Down Expand Up @@ -1012,7 +1034,8 @@ cciss_scsi_interpret_error(CommandList_struct *cp)

static int
cciss_scsi_do_inquiry(ctlr_info_t *c, unsigned char *scsi3addr,
unsigned char *buf, unsigned char bufsize)
unsigned char page, unsigned char *buf,
unsigned char bufsize)
{
int rc;
CommandList_struct *cp;
Expand All @@ -1032,8 +1055,8 @@ cciss_scsi_do_inquiry(ctlr_info_t *c, unsigned char *scsi3addr,
ei = cp->err_info;

cdb[0] = CISS_INQUIRY;
cdb[1] = 0;
cdb[2] = 0;
cdb[1] = (page != 0);
cdb[2] = page;
cdb[3] = 0;
cdb[4] = bufsize;
cdb[5] = 0;
Expand All @@ -1053,6 +1076,25 @@ cciss_scsi_do_inquiry(ctlr_info_t *c, unsigned char *scsi3addr,
return rc;
}

/* Get the device id from inquiry page 0x83 */
static int cciss_scsi_get_device_id(ctlr_info_t *c, unsigned char *scsi3addr,
unsigned char *device_id, int buflen)
{
int rc;
unsigned char *buf;

if (buflen > 16)
buflen = 16;
buf = kzalloc(64, GFP_KERNEL);
if (!buf)
return -1;
rc = cciss_scsi_do_inquiry(c, scsi3addr, 0x83, buf, 64);
if (rc == 0)
memcpy(device_id, &buf[8], buflen);
kfree(buf);
return rc != 0;
}

static int
cciss_scsi_do_report_phys_luns(ctlr_info_t *c,
ReportLunData_struct *buf, int bufsize)
Expand Down Expand Up @@ -1142,25 +1184,21 @@ cciss_update_non_disk_devices(int cntl_num, int hostno)
ctlr_info_t *c;
__u32 num_luns=0;
unsigned char *ch;
/* unsigned char found[CCISS_MAX_SCSI_DEVS_PER_HBA]; */
struct cciss_scsi_dev_t currentsd[CCISS_MAX_SCSI_DEVS_PER_HBA];
struct cciss_scsi_dev_t *currentsd, *this_device;
int ncurrent=0;
int reportlunsize = sizeof(*ld_buff) + CISS_MAX_PHYS_LUN * 8;
int i;

c = (ctlr_info_t *) hba[cntl_num];
ld_buff = kzalloc(reportlunsize, GFP_KERNEL);
if (ld_buff == NULL) {
printk(KERN_ERR "cciss: out of memory\n");
return;
}
inq_buff = kmalloc(OBDR_TAPE_INQ_SIZE, GFP_KERNEL);
if (inq_buff == NULL) {
printk(KERN_ERR "cciss: out of memory\n");
kfree(ld_buff);
return;
currentsd = kzalloc(sizeof(*currentsd) *
(CCISS_MAX_SCSI_DEVS_PER_HBA+1), GFP_KERNEL);
if (ld_buff == NULL || inq_buff == NULL || currentsd == NULL) {
printk(KERN_ERR "cciss: out of memory\n");
goto out;
}

this_device = &currentsd[CCISS_MAX_SCSI_DEVS_PER_HBA];
if (cciss_scsi_do_report_phys_luns(c, ld_buff, reportlunsize) == 0) {
ch = &ld_buff->LUNListLength[0];
num_luns = ((ch[0]<<24) | (ch[1]<<16) | (ch[2]<<8) | ch[3]) / 8;
Expand All @@ -1179,23 +1217,34 @@ cciss_update_non_disk_devices(int cntl_num, int hostno)


/* adjust our table of devices */
for(i=0; i<num_luns; i++)
{
int devtype;

for (i = 0; i < num_luns; i++) {
/* for each physical lun, do an inquiry */
if (ld_buff->LUN[i][3] & 0xC0) continue;
memset(inq_buff, 0, OBDR_TAPE_INQ_SIZE);
memcpy(&scsi3addr[0], &ld_buff->LUN[i][0], 8);

if (cciss_scsi_do_inquiry(hba[cntl_num], scsi3addr, inq_buff,
(unsigned char) OBDR_TAPE_INQ_SIZE) != 0) {
if (cciss_scsi_do_inquiry(hba[cntl_num], scsi3addr, 0, inq_buff,
(unsigned char) OBDR_TAPE_INQ_SIZE) != 0)
/* Inquiry failed (msg printed already) */
devtype = 0; /* so we will skip this device. */
} else /* what kind of device is this? */
devtype = (inq_buff[0] & 0x1f);

switch (devtype)
continue; /* so we will skip this device. */

this_device->devtype = (inq_buff[0] & 0x1f);
this_device->bus = -1;
this_device->target = -1;
this_device->lun = -1;
memcpy(this_device->scsi3addr, scsi3addr, 8);
memcpy(this_device->vendor, &inq_buff[8],
sizeof(this_device->vendor));
memcpy(this_device->model, &inq_buff[16],
sizeof(this_device->model));
memcpy(this_device->revision, &inq_buff[32],
sizeof(this_device->revision));
memset(this_device->device_id, 0,
sizeof(this_device->device_id));
cciss_scsi_get_device_id(hba[cntl_num], scsi3addr,
this_device->device_id, sizeof(this_device->device_id));

switch (this_device->devtype)
{
case 0x05: /* CD-ROM */ {

Expand All @@ -1220,15 +1269,10 @@ cciss_update_non_disk_devices(int cntl_num, int hostno)
if (ncurrent >= CCISS_MAX_SCSI_DEVS_PER_HBA) {
printk(KERN_INFO "cciss%d: %s ignored, "
"too many devices.\n", cntl_num,
scsi_device_type(devtype));
scsi_device_type(this_device->devtype));
break;
}
memcpy(&currentsd[ncurrent].scsi3addr[0],
&scsi3addr[0], 8);
currentsd[ncurrent].devtype = devtype;
currentsd[ncurrent].bus = -1;
currentsd[ncurrent].target = -1;
currentsd[ncurrent].lun = -1;
currentsd[ncurrent] = *this_device;
ncurrent++;
break;
default:
Expand All @@ -1240,6 +1284,7 @@ cciss_update_non_disk_devices(int cntl_num, int hostno)
out:
kfree(inq_buff);
kfree(ld_buff);
kfree(currentsd);
return;
}

Expand Down
4 changes: 4 additions & 0 deletions drivers/block/cciss_scsi.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -66,6 +66,10 @@ struct cciss_scsi_dev_t {
int devtype;
int bus, target, lun; /* as presented to the OS */
unsigned char scsi3addr[8]; /* as presented to the HW */
unsigned char device_id[16]; /* from inquiry pg. 0x83 */
unsigned char vendor[8]; /* bytes 8-15 of inquiry data */
unsigned char model[16]; /* bytes 16-31 of inquiry data */
unsigned char revision[4]; /* bytes 32-35 of inquiry data */
};

struct cciss_scsi_hba_t {
Expand Down

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