2 * LSI/Engenio/NetApp E-Series RDAC SCSI Device Handler
4 * Copyright (C) 2005 Mike Christie. All rights reserved.
5 * Copyright (C) Chandra Seetharaman, IBM Corp. 2007
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
22 #include <scsi/scsi.h>
23 #include <scsi/scsi_eh.h>
24 #include <scsi/scsi_dh.h>
25 #include <linux/workqueue.h>
26 #include <linux/slab.h>
27 #include <linux/module.h>
29 #define RDAC_NAME "rdac"
30 #define RDAC_RETRY_COUNT 5
35 * These struct definitions and the forming of the
36 * mode page were taken from the LSI RDAC 2.4 GPL'd
37 * driver, and then converted to Linux conventions.
39 #define RDAC_QUIESCENCE_TIME 20
43 #define RDAC_PAGE_CODE_REDUNDANT_CONTROLLER 0x2c
46 * Controller modes definitions
48 #define RDAC_MODE_TRANSFER_SPECIFIED_LUNS 0x02
53 #define RDAC_FORCED_QUIESENCE 0x02
55 #define RDAC_TIMEOUT (60 * HZ)
56 #define RDAC_RETRIES 3
58 struct rdac_mode_6_hdr {
65 struct rdac_mode_10_hdr {
73 struct rdac_mode_common {
74 u8 controller_serial[16];
75 u8 alt_controller_serial[16];
78 u8 quiescence_timeout;
82 struct rdac_pg_legacy {
83 struct rdac_mode_6_hdr hdr;
86 struct rdac_mode_common common;
87 #define MODE6_MAX_LUN 32
88 u8 lun_table[MODE6_MAX_LUN];
94 struct rdac_pg_expanded {
95 struct rdac_mode_10_hdr hdr;
99 struct rdac_mode_common common;
107 u8 page_code; /* 0xC9 */
110 u8 page_id[4]; /* "vace" */
116 #define SUBSYS_ID_LEN 16
117 #define SLOT_ID_LEN 2
118 #define ARRAY_LABEL_LEN 31
122 u8 page_code; /* 0xC4 */
125 u8 page_id[4]; /* "subs" */
126 u8 subsys_id[SUBSYS_ID_LEN];
128 u8 slot_id[SLOT_ID_LEN];
132 #define UNIQUE_ID_LEN 16
135 u8 page_code; /* 0xC8 */
138 u8 page_id[4]; /* "edid" */
142 u8 vol_user_label_len;
143 u8 vol_user_label[60];
144 u8 array_uniq_id_len;
145 u8 array_unique_id[UNIQUE_ID_LEN];
146 u8 array_user_label_len;
147 u8 array_user_label[60];
151 struct rdac_controller {
152 u8 array_id[UNIQUE_ID_LEN];
155 struct list_head node; /* list of all controllers */
157 struct rdac_pg_legacy legacy;
158 struct rdac_pg_expanded expanded;
161 u8 array_name[ARRAY_LABEL_LEN];
162 struct Scsi_Host *host;
165 struct work_struct ms_work;
166 struct scsi_device *ms_sdev;
167 struct list_head ms_head;
172 u8 page_code; /* 0xC2 */
175 u8 page_id[4]; /* "swr4" */
179 u8 max_lun_supported;
180 u8 partitions[239]; /* Total allocation length should be 0xFF */
183 struct rdac_dh_data {
184 struct rdac_controller *ctlr;
185 #define UNINITIALIZED_LUN (1 << 8)
189 #define RDAC_MODE_AVT 1
190 #define RDAC_MODE_IOSHIP 2
193 #define RDAC_STATE_ACTIVE 0
194 #define RDAC_STATE_PASSIVE 1
197 #define RDAC_LUN_UNOWNED 0
198 #define RDAC_LUN_OWNED 1
201 #define RDAC_PREFERRED 0
202 #define RDAC_NON_PREFERRED 1
205 unsigned char sense[SCSI_SENSE_BUFFERSIZE];
207 struct c2_inquiry c2;
208 struct c4_inquiry c4;
209 struct c8_inquiry c8;
210 struct c9_inquiry c9;
214 static const char *mode[] = {
219 static const char *lun_state[] =
225 struct rdac_queue_data {
226 struct list_head entry;
227 struct rdac_dh_data *h;
228 activate_complete callback_fn;
232 static LIST_HEAD(ctlr_list);
233 static DEFINE_SPINLOCK(list_lock);
234 static struct workqueue_struct *kmpath_rdacd;
235 static void send_mode_select(struct work_struct *work);
238 * module parameter to enable rdac debug logging.
239 * 2 bits for each type of logging, only two types defined for now
240 * Can be enhanced if required at later point
242 static int rdac_logging = 1;
243 module_param(rdac_logging, int, S_IRUGO|S_IWUSR);
244 MODULE_PARM_DESC(rdac_logging, "A bit mask of rdac logging levels, "
245 "Default is 1 - failover logging enabled, "
246 "set it to 0xF to enable all the logs");
248 #define RDAC_LOG_FAILOVER 0
249 #define RDAC_LOG_SENSE 2
251 #define RDAC_LOG_BITS 2
253 #define RDAC_LOG_LEVEL(SHIFT) \
254 ((rdac_logging >> (SHIFT)) & ((1 << (RDAC_LOG_BITS)) - 1))
256 #define RDAC_LOG(SHIFT, sdev, f, arg...) \
258 if (unlikely(RDAC_LOG_LEVEL(SHIFT))) \
259 sdev_printk(KERN_INFO, sdev, RDAC_NAME ": " f "\n", ## arg); \
262 static inline struct rdac_dh_data *get_rdac_data(struct scsi_device *sdev)
264 struct scsi_dh_data *scsi_dh_data = sdev->scsi_dh_data;
265 BUG_ON(scsi_dh_data == NULL);
266 return ((struct rdac_dh_data *) scsi_dh_data->buf);
269 static struct request *get_rdac_req(struct scsi_device *sdev,
270 void *buffer, unsigned buflen, int rw)
273 struct request_queue *q = sdev->request_queue;
275 rq = blk_get_request(q, rw, GFP_NOIO);
278 sdev_printk(KERN_INFO, sdev,
279 "get_rdac_req: blk_get_request failed.\n");
283 if (buflen && blk_rq_map_kern(q, rq, buffer, buflen, GFP_NOIO)) {
285 sdev_printk(KERN_INFO, sdev,
286 "get_rdac_req: blk_rq_map_kern failed.\n");
290 rq->cmd_type = REQ_TYPE_BLOCK_PC;
291 rq->cmd_flags |= REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT |
293 rq->retries = RDAC_RETRIES;
294 rq->timeout = RDAC_TIMEOUT;
299 static struct request *rdac_failover_get(struct scsi_device *sdev,
300 struct rdac_dh_data *h, struct list_head *list)
303 struct rdac_mode_common *common;
305 struct rdac_queue_data *qdata;
308 if (h->ctlr->use_ms10) {
309 struct rdac_pg_expanded *rdac_pg;
311 data_size = sizeof(struct rdac_pg_expanded);
312 rdac_pg = &h->ctlr->mode_select.expanded;
313 memset(rdac_pg, 0, data_size);
314 common = &rdac_pg->common;
315 rdac_pg->page_code = RDAC_PAGE_CODE_REDUNDANT_CONTROLLER + 0x40;
316 rdac_pg->subpage_code = 0x1;
317 rdac_pg->page_len[0] = 0x01;
318 rdac_pg->page_len[1] = 0x28;
319 lun_table = rdac_pg->lun_table;
321 struct rdac_pg_legacy *rdac_pg;
323 data_size = sizeof(struct rdac_pg_legacy);
324 rdac_pg = &h->ctlr->mode_select.legacy;
325 memset(rdac_pg, 0, data_size);
326 common = &rdac_pg->common;
327 rdac_pg->page_code = RDAC_PAGE_CODE_REDUNDANT_CONTROLLER;
328 rdac_pg->page_len = 0x68;
329 lun_table = rdac_pg->lun_table;
331 common->rdac_mode[1] = RDAC_MODE_TRANSFER_SPECIFIED_LUNS;
332 common->quiescence_timeout = RDAC_QUIESCENCE_TIME;
333 common->rdac_options = RDAC_FORCED_QUIESENCE;
335 list_for_each_entry(qdata, list, entry) {
336 lun_table[qdata->h->lun] = 0x81;
339 /* get request for block layer packet command */
340 rq = get_rdac_req(sdev, &h->ctlr->mode_select, data_size, WRITE);
344 /* Prepare the command. */
345 if (h->ctlr->use_ms10) {
346 rq->cmd[0] = MODE_SELECT_10;
347 rq->cmd[7] = data_size >> 8;
348 rq->cmd[8] = data_size & 0xff;
350 rq->cmd[0] = MODE_SELECT;
351 rq->cmd[4] = data_size;
353 rq->cmd_len = COMMAND_SIZE(rq->cmd[0]);
355 rq->sense = h->sense;
356 memset(rq->sense, 0, SCSI_SENSE_BUFFERSIZE);
362 static void release_controller(struct kref *kref)
364 struct rdac_controller *ctlr;
365 ctlr = container_of(kref, struct rdac_controller, kref);
367 flush_workqueue(kmpath_rdacd);
368 spin_lock(&list_lock);
369 list_del(&ctlr->node);
370 spin_unlock(&list_lock);
374 static struct rdac_controller *get_controller(int index, char *array_name,
375 u8 *array_id, struct scsi_device *sdev)
377 struct rdac_controller *ctlr, *tmp;
379 spin_lock(&list_lock);
381 list_for_each_entry(tmp, &ctlr_list, node) {
382 if ((memcmp(tmp->array_id, array_id, UNIQUE_ID_LEN) == 0) &&
383 (tmp->index == index) &&
384 (tmp->host == sdev->host)) {
385 kref_get(&tmp->kref);
386 spin_unlock(&list_lock);
390 ctlr = kmalloc(sizeof(*ctlr), GFP_ATOMIC);
394 /* initialize fields of controller */
395 memcpy(ctlr->array_id, array_id, UNIQUE_ID_LEN);
397 ctlr->host = sdev->host;
398 memcpy(ctlr->array_name, array_name, ARRAY_LABEL_LEN);
400 kref_init(&ctlr->kref);
403 ctlr->ms_sdev = NULL;
404 spin_lock_init(&ctlr->ms_lock);
405 INIT_WORK(&ctlr->ms_work, send_mode_select);
406 INIT_LIST_HEAD(&ctlr->ms_head);
407 list_add(&ctlr->node, &ctlr_list);
409 spin_unlock(&list_lock);
413 static int submit_inquiry(struct scsi_device *sdev, int page_code,
414 unsigned int len, struct rdac_dh_data *h)
417 struct request_queue *q = sdev->request_queue;
418 int err = SCSI_DH_RES_TEMP_UNAVAIL;
420 rq = get_rdac_req(sdev, &h->inq, len, READ);
424 /* Prepare the command. */
425 rq->cmd[0] = INQUIRY;
427 rq->cmd[2] = page_code;
429 rq->cmd_len = COMMAND_SIZE(INQUIRY);
431 rq->sense = h->sense;
432 memset(rq->sense, 0, SCSI_SENSE_BUFFERSIZE);
435 err = blk_execute_rq(q, NULL, rq, 1);
444 static int get_lun_info(struct scsi_device *sdev, struct rdac_dh_data *h,
445 char *array_name, u8 *array_id)
448 struct c8_inquiry *inqp;
450 err = submit_inquiry(sdev, 0xC8, sizeof(struct c8_inquiry), h);
451 if (err == SCSI_DH_OK) {
453 if (inqp->page_code != 0xc8)
454 return SCSI_DH_NOSYS;
455 if (inqp->page_id[0] != 'e' || inqp->page_id[1] != 'd' ||
456 inqp->page_id[2] != 'i' || inqp->page_id[3] != 'd')
457 return SCSI_DH_NOSYS;
458 h->lun = inqp->lun[7]; /* Uses only the last byte */
460 for(i=0; i<ARRAY_LABEL_LEN-1; ++i)
461 *(array_name+i) = inqp->array_user_label[(2*i)+1];
463 *(array_name+ARRAY_LABEL_LEN-1) = '\0';
464 memset(array_id, 0, UNIQUE_ID_LEN);
465 memcpy(array_id, inqp->array_unique_id, inqp->array_uniq_id_len);
470 static int check_ownership(struct scsi_device *sdev, struct rdac_dh_data *h)
473 struct c9_inquiry *inqp;
475 h->state = RDAC_STATE_ACTIVE;
476 err = submit_inquiry(sdev, 0xC9, sizeof(struct c9_inquiry), h);
477 if (err == SCSI_DH_OK) {
479 /* detect the operating mode */
480 if ((inqp->avte_cvp >> 5) & 0x1)
481 h->mode = RDAC_MODE_IOSHIP; /* LUN in IOSHIP mode */
482 else if (inqp->avte_cvp >> 7)
483 h->mode = RDAC_MODE_AVT; /* LUN in AVT mode */
485 h->mode = RDAC_MODE; /* LUN in RDAC mode */
487 /* Update ownership */
488 if (inqp->avte_cvp & 0x1)
489 h->lun_state = RDAC_LUN_OWNED;
491 h->lun_state = RDAC_LUN_UNOWNED;
492 if (h->mode == RDAC_MODE)
493 h->state = RDAC_STATE_PASSIVE;
496 /* Update path prio*/
497 if (inqp->path_prio & 0x1)
498 h->preferred = RDAC_PREFERRED;
500 h->preferred = RDAC_NON_PREFERRED;
506 static int initialize_controller(struct scsi_device *sdev,
507 struct rdac_dh_data *h, char *array_name, u8 *array_id)
510 struct c4_inquiry *inqp;
512 err = submit_inquiry(sdev, 0xC4, sizeof(struct c4_inquiry), h);
513 if (err == SCSI_DH_OK) {
515 /* get the controller index */
516 if (inqp->slot_id[1] == 0x31)
520 h->ctlr = get_controller(index, array_name, array_id, sdev);
522 err = SCSI_DH_RES_TEMP_UNAVAIL;
527 static int set_mode_select(struct scsi_device *sdev, struct rdac_dh_data *h)
530 struct c2_inquiry *inqp;
532 err = submit_inquiry(sdev, 0xC2, sizeof(struct c2_inquiry), h);
533 if (err == SCSI_DH_OK) {
536 * If more than MODE6_MAX_LUN luns are supported, use
539 if (inqp->max_lun_supported >= MODE6_MAX_LUN)
540 h->ctlr->use_ms10 = 1;
542 h->ctlr->use_ms10 = 0;
547 static int mode_select_handle_sense(struct scsi_device *sdev,
548 unsigned char *sensebuf)
550 struct scsi_sense_hdr sense_hdr;
551 int err = SCSI_DH_IO, ret;
552 struct rdac_dh_data *h = get_rdac_data(sdev);
554 ret = scsi_normalize_sense(sensebuf, SCSI_SENSE_BUFFERSIZE, &sense_hdr);
558 switch (sense_hdr.sense_key) {
560 case ABORTED_COMMAND:
565 if (sense_hdr.asc == 0x04 && sense_hdr.ascq == 0x01)
566 /* LUN Not Ready and is in the Process of Becoming
571 case ILLEGAL_REQUEST:
572 if (sense_hdr.asc == 0x91 && sense_hdr.ascq == 0x36)
574 * Command Lock contention
582 RDAC_LOG(RDAC_LOG_FAILOVER, sdev, "array %s, ctlr %d, "
583 "MODE_SELECT returned with sense %02x/%02x/%02x",
584 (char *) h->ctlr->array_name, h->ctlr->index,
585 sense_hdr.sense_key, sense_hdr.asc, sense_hdr.ascq);
591 static void send_mode_select(struct work_struct *work)
593 struct rdac_controller *ctlr =
594 container_of(work, struct rdac_controller, ms_work);
596 struct scsi_device *sdev = ctlr->ms_sdev;
597 struct rdac_dh_data *h = get_rdac_data(sdev);
598 struct request_queue *q = sdev->request_queue;
599 int err, retry_cnt = RDAC_RETRY_COUNT;
600 struct rdac_queue_data *tmp, *qdata;
603 spin_lock(&ctlr->ms_lock);
604 list_splice_init(&ctlr->ms_head, &list);
606 ctlr->ms_sdev = NULL;
607 spin_unlock(&ctlr->ms_lock);
610 err = SCSI_DH_RES_TEMP_UNAVAIL;
611 rq = rdac_failover_get(sdev, h, &list);
615 RDAC_LOG(RDAC_LOG_FAILOVER, sdev, "array %s, ctlr %d, "
616 "%s MODE_SELECT command",
617 (char *) h->ctlr->array_name, h->ctlr->index,
618 (retry_cnt == RDAC_RETRY_COUNT) ? "queueing" : "retrying");
620 err = blk_execute_rq(q, NULL, rq, 1);
622 if (err != SCSI_DH_OK) {
623 err = mode_select_handle_sense(sdev, h->sense);
624 if (err == SCSI_DH_RETRY && retry_cnt--)
627 if (err == SCSI_DH_OK) {
628 h->state = RDAC_STATE_ACTIVE;
629 RDAC_LOG(RDAC_LOG_FAILOVER, sdev, "array %s, ctlr %d, "
630 "MODE_SELECT completed",
631 (char *) h->ctlr->array_name, h->ctlr->index);
635 list_for_each_entry_safe(qdata, tmp, &list, entry) {
636 list_del(&qdata->entry);
637 if (err == SCSI_DH_OK)
638 qdata->h->state = RDAC_STATE_ACTIVE;
639 if (qdata->callback_fn)
640 qdata->callback_fn(qdata->callback_data, err);
646 static int queue_mode_select(struct scsi_device *sdev,
647 activate_complete fn, void *data)
649 struct rdac_queue_data *qdata;
650 struct rdac_controller *ctlr;
652 qdata = kzalloc(sizeof(*qdata), GFP_KERNEL);
654 return SCSI_DH_RETRY;
656 qdata->h = get_rdac_data(sdev);
657 qdata->callback_fn = fn;
658 qdata->callback_data = data;
660 ctlr = qdata->h->ctlr;
661 spin_lock(&ctlr->ms_lock);
662 list_add_tail(&qdata->entry, &ctlr->ms_head);
663 if (!ctlr->ms_queued) {
665 ctlr->ms_sdev = sdev;
666 queue_work(kmpath_rdacd, &ctlr->ms_work);
668 spin_unlock(&ctlr->ms_lock);
672 static int rdac_activate(struct scsi_device *sdev,
673 activate_complete fn, void *data)
675 struct rdac_dh_data *h = get_rdac_data(sdev);
676 int err = SCSI_DH_OK;
679 err = check_ownership(sdev, h);
680 if (err != SCSI_DH_OK)
685 if (h->lun_state == RDAC_LUN_UNOWNED)
688 case RDAC_MODE_IOSHIP:
689 if ((h->lun_state == RDAC_LUN_UNOWNED) &&
690 (h->preferred == RDAC_PREFERRED))
698 err = queue_mode_select(sdev, fn, data);
699 if (err == SCSI_DH_OK)
708 static int rdac_prep_fn(struct scsi_device *sdev, struct request *req)
710 struct rdac_dh_data *h = get_rdac_data(sdev);
711 int ret = BLKPREP_OK;
713 if (h->state != RDAC_STATE_ACTIVE) {
715 req->cmd_flags |= REQ_QUIET;
721 static int rdac_check_sense(struct scsi_device *sdev,
722 struct scsi_sense_hdr *sense_hdr)
724 struct rdac_dh_data *h = get_rdac_data(sdev);
726 RDAC_LOG(RDAC_LOG_SENSE, sdev, "array %s, ctlr %d, "
727 "I/O returned with sense %02x/%02x/%02x",
728 (char *) h->ctlr->array_name, h->ctlr->index,
729 sense_hdr->sense_key, sense_hdr->asc, sense_hdr->ascq);
731 switch (sense_hdr->sense_key) {
733 if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0x01)
734 /* LUN Not Ready - Logical Unit Not Ready and is in
735 * the process of becoming ready
738 return ADD_TO_MLQUEUE;
739 if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0x81)
740 /* LUN Not Ready - Storage firmware incompatible
741 * Manual code synchonisation required.
743 * Nothing we can do here. Try to bypass the path.
746 if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0xA1)
747 /* LUN Not Ready - Quiescense in progress
749 * Just retry and wait.
751 return ADD_TO_MLQUEUE;
752 if (sense_hdr->asc == 0xA1 && sense_hdr->ascq == 0x02)
753 /* LUN Not Ready - Quiescense in progress
754 * or has been achieved
757 return ADD_TO_MLQUEUE;
759 case ILLEGAL_REQUEST:
760 if (sense_hdr->asc == 0x94 && sense_hdr->ascq == 0x01) {
761 /* Invalid Request - Current Logical Unit Ownership.
762 * Controller is not the current owner of the LUN,
763 * Fail the path, so that the other path be used.
765 h->state = RDAC_STATE_PASSIVE;
770 if (sense_hdr->asc == 0x29 && sense_hdr->ascq == 0x00)
772 * Power On, Reset, or Bus Device Reset, just retry.
774 return ADD_TO_MLQUEUE;
775 if (sense_hdr->asc == 0x8b && sense_hdr->ascq == 0x02)
777 * Quiescence in progress , just retry.
779 return ADD_TO_MLQUEUE;
782 /* success just means we do not care what scsi-ml does */
783 return SCSI_RETURN_NOT_HANDLED;
786 static const struct scsi_dh_devlist rdac_dev_list[] = {
801 {"STK", "OPENstorage D280"},
803 {"SUN", "LCSM100_I"},
804 {"SUN", "LCSM100_S"},
805 {"SUN", "LCSM100_E"},
806 {"SUN", "LCSM100_F"},
813 {"LSI", "INF-01-00"},
814 {"ENGENIO", "INF-01-00"},
815 {"STK", "FLEXLINE 380"},
816 {"SUN", "CSM100_R_FC"},
817 {"SUN", "STK6580_6780"},
819 {"SUN", "ArrayStorage"},
823 static int rdac_bus_attach(struct scsi_device *sdev);
824 static void rdac_bus_detach(struct scsi_device *sdev);
826 static struct scsi_device_handler rdac_dh = {
828 .module = THIS_MODULE,
829 .devlist = rdac_dev_list,
830 .prep_fn = rdac_prep_fn,
831 .check_sense = rdac_check_sense,
832 .attach = rdac_bus_attach,
833 .detach = rdac_bus_detach,
834 .activate = rdac_activate,
837 static int rdac_bus_attach(struct scsi_device *sdev)
839 struct scsi_dh_data *scsi_dh_data;
840 struct rdac_dh_data *h;
843 char array_name[ARRAY_LABEL_LEN];
844 char array_id[UNIQUE_ID_LEN];
846 scsi_dh_data = kzalloc(sizeof(*scsi_dh_data)
847 + sizeof(*h) , GFP_KERNEL);
849 sdev_printk(KERN_ERR, sdev, "%s: Attach failed\n",
854 scsi_dh_data->scsi_dh = &rdac_dh;
855 h = (struct rdac_dh_data *) scsi_dh_data->buf;
856 h->lun = UNINITIALIZED_LUN;
857 h->state = RDAC_STATE_ACTIVE;
859 err = get_lun_info(sdev, h, array_name, array_id);
860 if (err != SCSI_DH_OK)
863 err = initialize_controller(sdev, h, array_name, array_id);
864 if (err != SCSI_DH_OK)
867 err = check_ownership(sdev, h);
868 if (err != SCSI_DH_OK)
871 err = set_mode_select(sdev, h);
872 if (err != SCSI_DH_OK)
875 if (!try_module_get(THIS_MODULE))
878 spin_lock_irqsave(sdev->request_queue->queue_lock, flags);
879 sdev->scsi_dh_data = scsi_dh_data;
880 spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags);
882 sdev_printk(KERN_NOTICE, sdev,
883 "%s: LUN %d (%s) (%s)\n",
884 RDAC_NAME, h->lun, mode[(int)h->mode],
885 lun_state[(int)h->lun_state]);
890 kref_put(&h->ctlr->kref, release_controller);
894 sdev_printk(KERN_ERR, sdev, "%s: not attached\n",
899 static void rdac_bus_detach( struct scsi_device *sdev )
901 struct scsi_dh_data *scsi_dh_data;
902 struct rdac_dh_data *h;
905 spin_lock_irqsave(sdev->request_queue->queue_lock, flags);
906 scsi_dh_data = sdev->scsi_dh_data;
907 sdev->scsi_dh_data = NULL;
908 spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags);
910 h = (struct rdac_dh_data *) scsi_dh_data->buf;
912 kref_put(&h->ctlr->kref, release_controller);
914 module_put(THIS_MODULE);
915 sdev_printk(KERN_NOTICE, sdev, "%s: Detached\n", RDAC_NAME);
920 static int __init rdac_init(void)
924 r = scsi_register_device_handler(&rdac_dh);
926 printk(KERN_ERR "Failed to register scsi device handler.");
931 * Create workqueue to handle mode selects for rdac
933 kmpath_rdacd = create_singlethread_workqueue("kmpath_rdacd");
935 scsi_unregister_device_handler(&rdac_dh);
936 printk(KERN_ERR "kmpath_rdacd creation failed.\n");
942 static void __exit rdac_exit(void)
944 destroy_workqueue(kmpath_rdacd);
945 scsi_unregister_device_handler(&rdac_dh);
948 module_init(rdac_init);
949 module_exit(rdac_exit);
951 MODULE_DESCRIPTION("Multipath LSI/Engenio/NetApp E-Series RDAC driver");
952 MODULE_AUTHOR("Mike Christie, Chandra Seetharaman");
953 MODULE_VERSION("01.00.0000.0000");
954 MODULE_LICENSE("GPL");