[SCSI] scsi_dh: Update RDAC device handler

This patch updates the RDAC device handler to
refuse to attach to devices not supporting the
RDAC vpd pages.

Signed-off-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Chandra Seetharaman <sekharan@us.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>

diff --git a/drivers/scsi/device_handler/scsi_dh_rdac.c b/drivers/scsi/device_handler/scsi_dh_rdac.c
index 0e25a6e9c82dd4a7ca7d6d2dd077f30967466780..b093a501f8ae673b980ca896d6d73d4ed407a78e 100644 (file)
--- a/drivers/scsi/device_handler/scsi_dh_rdac.c
+++ b/drivers/scsi/device_handler/scsi_dh_rdac.c
@@ -173,6 +173,11 @@ struct rdac_dh_data {
 #define RDAC_STATE_ACTIVE      0
 #define RDAC_STATE_PASSIVE     1
        unsigned char           state;
+
+#define RDAC_LUN_UNOWNED       0
+#define RDAC_LUN_OWNED         1
+#define RDAC_LUN_AVT           2
+       char                    lun_state;
        unsigned char           sense[SCSI_SENSE_BUFFERSIZE];
        union                   {
                struct c2_inquiry c2;
@@ -182,6 +187,13 @@ struct rdac_dh_data {
        } inq;
 };
 
+static const char *lun_state[] =
+{
+       "unowned",
+       "owned",
+       "owned (AVT mode)",
+};
+
 static LIST_HEAD(ctlr_list);
 static DEFINE_SPINLOCK(list_lock);
 
@@ -197,9 +209,8 @@ static struct request *get_rdac_req(struct scsi_device *sdev,
 {
        struct request *rq;
        struct request_queue *q = sdev->request_queue;
-       struct rdac_dh_data *h = get_rdac_data(sdev);
 
-       rq = blk_get_request(q, rw, GFP_KERNEL);
+       rq = blk_get_request(q, rw, GFP_NOIO);
 
        if (!rq) {
                sdev_printk(KERN_INFO, sdev,
@@ -207,17 +218,14 @@ static struct request *get_rdac_req(struct scsi_device *sdev,
                return NULL;
        }
 
-       if (buflen && blk_rq_map_kern(q, rq, buffer, buflen, GFP_KERNEL)) {
+       if (buflen && blk_rq_map_kern(q, rq, buffer, buflen, GFP_NOIO)) {
                blk_put_request(rq);
                sdev_printk(KERN_INFO, sdev,
                                "get_rdac_req: blk_rq_map_kern failed.\n");
                return NULL;
        }
 
-       memset(&rq->cmd, 0, BLK_MAX_CDB);
-       rq->sense = h->sense;
-       memset(rq->sense, 0, SCSI_SENSE_BUFFERSIZE);
-       rq->sense_len = 0;
+       memset(rq->cmd, 0, BLK_MAX_CDB);
 
        rq->cmd_type = REQ_TYPE_BLOCK_PC;
        rq->cmd_flags |= REQ_FAILFAST | REQ_NOMERGE;
@@ -227,12 +235,12 @@ static struct request *get_rdac_req(struct scsi_device *sdev,
        return rq;
 }
 
-static struct request *rdac_failover_get(struct scsi_device *sdev)
+static struct request *rdac_failover_get(struct scsi_device *sdev,
+                                        struct rdac_dh_data *h)
 {
        struct request *rq;
        struct rdac_mode_common *common;
        unsigned data_size;
-       struct rdac_dh_data *h = get_rdac_data(sdev);
 
        if (h->ctlr->use_ms10) {
                struct rdac_pg_expanded *rdac_pg;
@@ -277,6 +285,10 @@ static struct request *rdac_failover_get(struct scsi_device *sdev)
        }
        rq->cmd_len = COMMAND_SIZE(rq->cmd[0]);
 
+       rq->sense = h->sense;
+       memset(rq->sense, 0, SCSI_SENSE_BUFFERSIZE);
+       rq->sense_len = 0;
+
        return rq;
 }
 
@@ -321,11 +333,10 @@ done:
 }
 
 static int submit_inquiry(struct scsi_device *sdev, int page_code,
-               unsigned int len)
+                         unsigned int len, struct rdac_dh_data *h)
 {
        struct request *rq;
        struct request_queue *q = sdev->request_queue;
-       struct rdac_dh_data *h = get_rdac_data(sdev);
        int err = SCSI_DH_RES_TEMP_UNAVAIL;
 
        rq = get_rdac_req(sdev, &h->inq, len, READ);
@@ -338,59 +349,68 @@ static int submit_inquiry(struct scsi_device *sdev, int page_code,
        rq->cmd[2] = page_code;
        rq->cmd[4] = len;
        rq->cmd_len = COMMAND_SIZE(INQUIRY);
+
+       rq->sense = h->sense;
+       memset(rq->sense, 0, SCSI_SENSE_BUFFERSIZE);
+       rq->sense_len = 0;
+
        err = blk_execute_rq(q, NULL, rq, 1);
        if (err == -EIO)
                err = SCSI_DH_IO;
+
+       blk_put_request(rq);
 done:
        return err;
 }
 
-static int get_lun(struct scsi_device *sdev)
+static int get_lun(struct scsi_device *sdev, struct rdac_dh_data *h)
 {
        int err;
        struct c8_inquiry *inqp;
-       struct rdac_dh_data *h = get_rdac_data(sdev);
 
-       err = submit_inquiry(sdev, 0xC8, sizeof(struct c8_inquiry));
+       err = submit_inquiry(sdev, 0xC8, sizeof(struct c8_inquiry), h);
        if (err == SCSI_DH_OK) {
                inqp = &h->inq.c8;
-               h->lun = inqp->lun[7]; /* currently it uses only one byte */
+               if (inqp->page_code != 0xc8)
+                       return SCSI_DH_NOSYS;
+               if (inqp->page_id[0] != 'e' || inqp->page_id[1] != 'd' ||
+                   inqp->page_id[2] != 'i' || inqp->page_id[3] != 'd')
+                       return SCSI_DH_NOSYS;
+               h->lun = scsilun_to_int((struct scsi_lun *)inqp->lun);
        }
        return err;
 }
 
-#define RDAC_OWNED     0
-#define RDAC_UNOWNED   1
-#define RDAC_FAILED    2
-static int check_ownership(struct scsi_device *sdev)
+static int check_ownership(struct scsi_device *sdev, struct rdac_dh_data *h)
 {
        int err;
        struct c9_inquiry *inqp;
-       struct rdac_dh_data *h = get_rdac_data(sdev);
 
-       err = submit_inquiry(sdev, 0xC9, sizeof(struct c9_inquiry));
+       err = submit_inquiry(sdev, 0xC9, sizeof(struct c9_inquiry), h);
        if (err == SCSI_DH_OK) {
-               err = RDAC_UNOWNED;
                inqp = &h->inq.c9;
-               /*
-                * If in AVT mode or if the path already owns the LUN,
-                * return RDAC_OWNED;
-                */
-               if (((inqp->avte_cvp >> 7) == 0x1) ||
-                                ((inqp->avte_cvp & 0x1) != 0))
-                       err = RDAC_OWNED;
-       } else
-               err = RDAC_FAILED;
+               if ((inqp->avte_cvp >> 7) == 0x1) {
+                       /* LUN in AVT mode */
+                       sdev_printk(KERN_NOTICE, sdev,
+                                   "%s: AVT mode detected\n",
+                                   RDAC_NAME);
+                       h->lun_state = RDAC_LUN_AVT;
+               } else if ((inqp->avte_cvp & 0x1) != 0) {
+                       /* LUN was owned by the controller */
+                       h->lun_state = RDAC_LUN_OWNED;
+               }
+       }
+
        return err;
 }
 
-static int initialize_controller(struct scsi_device *sdev)
+static int initialize_controller(struct scsi_device *sdev,
+                                struct rdac_dh_data *h)
 {
        int err;
        struct c4_inquiry *inqp;
-       struct rdac_dh_data *h = get_rdac_data(sdev);
 
-       err = submit_inquiry(sdev, 0xC4, sizeof(struct c4_inquiry));
+       err = submit_inquiry(sdev, 0xC4, sizeof(struct c4_inquiry), h);
        if (err == SCSI_DH_OK) {
                inqp = &h->inq.c4;
                h->ctlr = get_controller(inqp->subsys_id, inqp->slot_id);
@@ -400,13 +420,12 @@ static int initialize_controller(struct scsi_device *sdev)
        return err;
 }
 
-static int set_mode_select(struct scsi_device *sdev)
+static int set_mode_select(struct scsi_device *sdev, struct rdac_dh_data *h)
 {
        int err;
        struct c2_inquiry *inqp;
-       struct rdac_dh_data *h = get_rdac_data(sdev);
 
-       err = submit_inquiry(sdev, 0xC2, sizeof(struct c2_inquiry));
+       err = submit_inquiry(sdev, 0xC2, sizeof(struct c2_inquiry), h);
        if (err == SCSI_DH_OK) {
                inqp = &h->inq.c2;
                /*
@@ -421,13 +440,13 @@ static int set_mode_select(struct scsi_device *sdev)
        return err;
 }
 
-static int mode_select_handle_sense(struct scsi_device *sdev)
+static int mode_select_handle_sense(struct scsi_device *sdev,
+                                   unsigned char *sensebuf)
 {
        struct scsi_sense_hdr sense_hdr;
-       struct rdac_dh_data *h = get_rdac_data(sdev);
        int sense, err = SCSI_DH_IO, ret;
 
-       ret = scsi_normalize_sense(h->sense, SCSI_SENSE_BUFFERSIZE, &sense_hdr);
+       ret = scsi_normalize_sense(sensebuf, SCSI_SENSE_BUFFERSIZE, &sense_hdr);
        if (!ret)
                goto done;
 
@@ -451,14 +470,13 @@ done:
        return err;
 }
 
-static int send_mode_select(struct scsi_device *sdev)
+static int send_mode_select(struct scsi_device *sdev, struct rdac_dh_data *h)
 {
        struct request *rq;
        struct request_queue *q = sdev->request_queue;
-       struct rdac_dh_data *h = get_rdac_data(sdev);
        int err = SCSI_DH_RES_TEMP_UNAVAIL;
 
-       rq = rdac_failover_get(sdev);
+       rq = rdac_failover_get(sdev, h);
        if (!rq)
                goto done;
 
@@ -466,9 +484,11 @@ static int send_mode_select(struct scsi_device *sdev)
 
        err = blk_execute_rq(q, NULL, rq, 1);
        if (err != SCSI_DH_OK)
-               err = mode_select_handle_sense(sdev);
+               err = mode_select_handle_sense(sdev, h->sense);
        if (err == SCSI_DH_OK)
                h->state = RDAC_STATE_ACTIVE;
+
+       blk_put_request(rq);
 done:
        return err;
 }
@@ -478,38 +498,23 @@ static int rdac_activate(struct scsi_device *sdev)
        struct rdac_dh_data *h = get_rdac_data(sdev);
        int err = SCSI_DH_OK;
 
-       if (h->lun == UNINITIALIZED_LUN) {
-               err = get_lun(sdev);
-               if (err != SCSI_DH_OK)
-                       goto done;
-       }
-
-       err = check_ownership(sdev);
-       switch (err) {
-       case RDAC_UNOWNED:
-               break;
-       case RDAC_OWNED:
-               err = SCSI_DH_OK;
-               goto done;
-       case RDAC_FAILED:
-       default:
-               err = SCSI_DH_IO;
+       err = check_ownership(sdev, h);
+       if (err != SCSI_DH_OK)
                goto done;
-       }
 
        if (!h->ctlr) {
-               err = initialize_controller(sdev);
+               err = initialize_controller(sdev, h);
                if (err != SCSI_DH_OK)
                        goto done;
        }
 
        if (h->ctlr->use_ms10 == -1) {
-               err = set_mode_select(sdev);
+               err = set_mode_select(sdev, h);
                if (err != SCSI_DH_OK)
                        goto done;
        }
-
-       err = send_mode_select(sdev);
+       if (h->lun_state == RDAC_LUN_UNOWNED)
+               err = send_mode_select(sdev, h);
 done:
        return err;
 }
@@ -606,11 +611,12 @@ static int rdac_bus_attach(struct scsi_device *sdev)
        struct scsi_dh_data *scsi_dh_data;
        struct rdac_dh_data *h;
        unsigned long flags;
+       int err;
 
        scsi_dh_data = kzalloc(sizeof(struct scsi_device_handler *)
                               + sizeof(*h) , GFP_KERNEL);
        if (!scsi_dh_data) {
-               sdev_printk(KERN_ERR, sdev, "Attach failed %s.\n",
+               sdev_printk(KERN_ERR, sdev, "%s: Attach failed\n",
                            RDAC_NAME);
                return 0;
        }
@@ -619,14 +625,33 @@ static int rdac_bus_attach(struct scsi_device *sdev)
        h = (struct rdac_dh_data *) scsi_dh_data->buf;
        h->lun = UNINITIALIZED_LUN;
        h->state = RDAC_STATE_ACTIVE;
+
+       err = get_lun(sdev, h);
+       if (err != SCSI_DH_OK)
+               goto failed;
+
+       err = check_ownership(sdev, h);
+       if (err != SCSI_DH_OK)
+               goto failed;
+
+       if (!try_module_get(THIS_MODULE))
+               goto failed;
+
        spin_lock_irqsave(sdev->request_queue->queue_lock, flags);
        sdev->scsi_dh_data = scsi_dh_data;
        spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags);
-       try_module_get(THIS_MODULE);
 
-       sdev_printk(KERN_NOTICE, sdev, "Attached %s\n", RDAC_NAME);
+       sdev_printk(KERN_NOTICE, sdev,
+                   "%s: LUN %d (%s)\n",
+                   RDAC_NAME, h->lun, lun_state[(int)h->lun_state]);
 
        return 0;
+
+failed:
+       kfree(scsi_dh_data);
+       sdev_printk(KERN_ERR, sdev, "%s: not attached\n",
+                   RDAC_NAME);
+       return -EINVAL;
 }
 
 static void rdac_bus_detach( struct scsi_device *sdev )
@@ -645,7 +670,7 @@ static void rdac_bus_detach( struct scsi_device *sdev )
                kref_put(&h->ctlr->kref, release_controller);
        kfree(scsi_dh_data);
        module_put(THIS_MODULE);
-       sdev_printk(KERN_NOTICE, sdev, "Detached %s\n", RDAC_NAME);
+       sdev_printk(KERN_NOTICE, sdev, "%s: Detached\n", RDAC_NAME);
 }