[PATCH] cciss: SCSI tape info for /proc

Add SCSI host and device info not elsewhere available to /proc/scsi/cciss/*
Namely, connect cciss device instance with scsi host number, and give scsi
host number, bus, target, lun, devicetype, and 8-byte cciss LUNID for each
tapedrive/medium changer attached to a controller

For instance:

# cat /proc/scsi/cciss/2
cciss0: SCSI host: 2
c2b0t0l0 01 0x0000000000000001

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>

1 files changed, 24 insertions, 3 deletions

diff --git a/drivers/block/cciss_scsi.c b/drivers/block/cciss_scsi.c
index efc0bea7693f..e183a3ef7839 100644
--- a/drivers/block/cciss_scsi.c
+++ b/drivers/block/cciss_scsi.c
@@ -1144,6 +1144,7 @@ cciss_scsi_proc_info(struct Scsi_Host *sh,
 
         int buflen, datalen;
         ctlr_info_t *ci;
+        int i;
         int cntl_num;
 
 
@@ -1154,8 +1155,28 @@ cciss_scsi_proc_info(struct Scsi_Host *sh,
         cntl_num = ci->ctlr;    /* Get our index into the hba[] array */
 
         if (func == 0) {        /* User is reading from /proc/scsi/ciss*?/?*  */
-                buflen = sprintf(buffer, "hostnum=%d\n", sh->host_no);  
-
+                buflen = sprintf(buffer, "cciss%d: SCSI host: %d\n",
+                                cntl_num, sh->host_no);
+
+                /* this information is needed by apps to know which cciss
+                   device corresponds to which scsi host number without
+                   having to open a scsi target device node.  The device
+                   information is not a duplicate of /proc/scsi/scsi because
+                   the two may be out of sync due to scsi hotplug, rather
+                   this info is for an app to be able to use to know how to
+                   get them back in sync. */
+
+                for (i=0;i<ccissscsi[cntl_num].ndevices;i++) {
+                        struct cciss_scsi_dev_t *sd = &ccissscsi[cntl_num].dev[i];
+                        buflen += sprintf(&buffer[buflen], "c%db%dt%dl%d %02d "
+                                "0x%02x%02x%02x%02x%02x%02x%02x%02x\n",
+                                sh->host_no, sd->bus, sd->target, sd->lun,
+                                sd->devtype,
+                                sd->scsi3addr[0], sd->scsi3addr[1],
+                                sd->scsi3addr[2], sd->scsi3addr[3],
+                                sd->scsi3addr[4], sd->scsi3addr[5],
+                                sd->scsi3addr[6], sd->scsi3addr[7]);
+                }
                 datalen = buflen - offset;
                 if (datalen < 0) {      /* they're reading past EOF. */
                         datalen = 0;
@@ -1417,7 +1438,7 @@ cciss_proc_tape_report(int ctlr, unsigned char *buffer, off_t *pos, off_t *len)
 
         CPQ_TAPE_LOCK(ctlr, flags);
         size = sprintf(buffer + *len, 
-                "       Sequential access devices: %d\n\n",
+                "Sequential access devices: %d\n\n",
                         ccissscsi[ctlr].ndevices);
         CPQ_TAPE_UNLOCK(ctlr, flags);
         *pos += size; *len += size;