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[PATCH] cciss: One Button Disaster Recovery support 

This patch adds support for "One Button Disaster Recovery" devices to the
cciss driver.  (OBDR devices are tape drives which can pretend to be cd-rom
devices temporarily.  Once booted the device can be reverted to a tape drive
and data recovery operations can be automatically begun.)

This is an enhancement request by a vendor/partner working on One Button
Disaster Recovery.

Signed-off-by: Stephen M. Cameron <steve.cameron@hp.com>
Signed-off-by: Mike Miller <mike.miller@hp.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Mike Miller 2005-09-13 01:25:25 -07:00 committed by Linus Torvalds
parent bb2a37bf41
commit 47922d068e
1 changed files with 29 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

41
drivers/block/cciss_scsi.c
View File

@ -878,7 +878,7 @@ cciss_scsi_interpret_error(CommandList_struct *cp)
static int static int
cciss_scsi_do_inquiry(ctlr_info_t *c, unsigned char *scsi3addr, cciss_scsi_do_inquiry(ctlr_info_t *c, unsigned char *scsi3addr,
InquiryData_struct *buf) unsigned char *buf, unsigned char bufsize)
{ {
int rc; int rc;
CommandList_struct *cp; CommandList_struct *cp;
@ -901,11 +901,10 @@ cciss_scsi_do_inquiry(ctlr_info_t *c, unsigned char *scsi3addr,
cdb[1] = 0; cdb[1] = 0;
cdb[2] = 0; cdb[2] = 0;
cdb[3] = 0; cdb[3] = 0;
cdb[4] = sizeof(*buf) & 0xff; cdb[4] = bufsize;
cdb[5] = 0; cdb[5] = 0;
rc = cciss_scsi_do_simple_cmd(c, cp, scsi3addr, cdb, rc = cciss_scsi_do_simple_cmd(c, cp, scsi3addr, cdb,
6, (unsigned char *) buf, 6, buf, bufsize, XFER_READ);
sizeof(*buf), XFER_READ);
if (rc != 0) return rc; /* something went wrong */ if (rc != 0) return rc; /* something went wrong */
@ -1001,9 +1000,10 @@ cciss_update_non_disk_devices(int cntl_num, int hostno)
that though. that though.
*/ */
#define OBDR_TAPE_INQ_SIZE 49
#define OBDR_TAPE_SIG "$DR-10"
ReportLunData_struct *ld_buff; ReportLunData_struct *ld_buff;
InquiryData_struct *inq_buff; unsigned char *inq_buff;
unsigned char scsi3addr[8]; unsigned char scsi3addr[8];
ctlr_info_t *c; ctlr_info_t *c;
__u32 num_luns=0; __u32 num_luns=0;
@ -1021,7 +1021,7 @@ cciss_update_non_disk_devices(int cntl_num, int hostno)
return; return;
} }
memset(ld_buff, 0, reportlunsize); memset(ld_buff, 0, reportlunsize);
inq_buff = kmalloc(sizeof( InquiryData_struct), GFP_KERNEL); inq_buff = kmalloc(OBDR_TAPE_INQ_SIZE, GFP_KERNEL);
if (inq_buff == NULL) { if (inq_buff == NULL) {
printk(KERN_ERR "cciss: out of memory\n"); printk(KERN_ERR "cciss: out of memory\n");
kfree(ld_buff); kfree(ld_buff);
@ -1052,19 +1052,36 @@ cciss_update_non_disk_devices(int cntl_num, int hostno)
/* for each physical lun, do an inquiry */ /* for each physical lun, do an inquiry */
if (ld_buff->LUN[i][3] & 0xC0) continue; if (ld_buff->LUN[i][3] & 0xC0) continue;
memset(inq_buff, 0, sizeof(InquiryData_struct)); memset(inq_buff, 0, OBDR_TAPE_INQ_SIZE);
memcpy(&scsi3addr[0], &ld_buff->LUN[i][0], 8); memcpy(&scsi3addr[0], &ld_buff->LUN[i][0], 8);
if (cciss_scsi_do_inquiry(hba[cntl_num], if (cciss_scsi_do_inquiry(hba[cntl_num], scsi3addr, inq_buff,
scsi3addr, inq_buff) != 0) (unsigned char) OBDR_TAPE_INQ_SIZE) != 0) {
{
/* Inquiry failed (msg printed already) */ /* Inquiry failed (msg printed already) */
devtype = 0; /* so we will skip this device. */ devtype = 0; /* so we will skip this device. */
} else /* what kind of device is this? */ } else /* what kind of device is this? */
devtype = (inq_buff->data_byte[0] & 0x1f); devtype = (inq_buff[0] & 0x1f);
switch (devtype) switch (devtype)
{ {
case 0x05: /* CD-ROM */ {
/* We don't *really* support actual CD-ROM devices,
* just this "One Button Disaster Recovery" tape drive
* which temporarily pretends to be a CD-ROM drive.
* So we check that the device is really an OBDR tape
* device by checking for "$DR-10" in bytes 43-48 of
* the inquiry data.
*/
char obdr_sig[7];
strncpy(obdr_sig, &inq_buff[43], 6);
obdr_sig[6] = '\0';
if (strncmp(obdr_sig, OBDR_TAPE_SIG, 6) != 0)
/* Not OBDR device, ignore it. */
break;
}
/* fall through . . . */
case 0x01: /* sequential access, (tape) */ case 0x01: /* sequential access, (tape) */
case 0x08: /* medium changer */ case 0x08: /* medium changer */
if (ncurrent >= CCISS_MAX_SCSI_DEVS_PER_HBA) { if (ncurrent >= CCISS_MAX_SCSI_DEVS_PER_HBA) {