1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30#include <linux/string.h>
31#include <linux/parser.h>
32#include <linux/timer.h>
33#include <linux/fs.h>
34#include <linux/blkdev.h>
35#include <linux/slab.h>
36#include <linux/spinlock.h>
37#include <linux/bio.h>
38#include <linux/genhd.h>
39#include <linux/file.h>
40#include <linux/module.h>
41#include <scsi/scsi.h>
42#include <scsi/scsi_host.h>
43#include <asm/unaligned.h>
44
45#include <target/target_core_base.h>
46#include <target/target_core_backend.h>
47
48#include "target_core_iblock.h"
49
50#define IBLOCK_MAX_BIO_PER_TASK 32
51#define IBLOCK_BIO_POOL_SIZE 128
52
53static struct se_subsystem_api iblock_template;
54
55static void iblock_bio_done(struct bio *, int);
56
57
58
59
60
61static int iblock_attach_hba(struct se_hba *hba, u32 host_id)
62{
63 pr_debug("CORE_HBA[%d] - TCM iBlock HBA Driver %s on"
64 " Generic Target Core Stack %s\n", hba->hba_id,
65 IBLOCK_VERSION, TARGET_CORE_MOD_VERSION);
66 return 0;
67}
68
69static void iblock_detach_hba(struct se_hba *hba)
70{
71}
72
73static void *iblock_allocate_virtdevice(struct se_hba *hba, const char *name)
74{
75 struct iblock_dev *ib_dev = NULL;
76
77 ib_dev = kzalloc(sizeof(struct iblock_dev), GFP_KERNEL);
78 if (!ib_dev) {
79 pr_err("Unable to allocate struct iblock_dev\n");
80 return NULL;
81 }
82
83 pr_debug( "IBLOCK: Allocated ib_dev for %s\n", name);
84
85 return ib_dev;
86}
87
88static struct se_device *iblock_create_virtdevice(
89 struct se_hba *hba,
90 struct se_subsystem_dev *se_dev,
91 void *p)
92{
93 struct iblock_dev *ib_dev = p;
94 struct se_device *dev;
95 struct se_dev_limits dev_limits;
96 struct block_device *bd = NULL;
97 struct request_queue *q;
98 struct queue_limits *limits;
99 u32 dev_flags = 0;
100 fmode_t mode;
101 int ret = -EINVAL;
102
103 if (!ib_dev) {
104 pr_err("Unable to locate struct iblock_dev parameter\n");
105 return ERR_PTR(ret);
106 }
107 memset(&dev_limits, 0, sizeof(struct se_dev_limits));
108
109 ib_dev->ibd_bio_set = bioset_create(IBLOCK_BIO_POOL_SIZE, 0);
110 if (!ib_dev->ibd_bio_set) {
111 pr_err("IBLOCK: Unable to create bioset()\n");
112 return ERR_PTR(-ENOMEM);
113 }
114 pr_debug("IBLOCK: Created bio_set()\n");
115
116
117
118
119 pr_debug( "IBLOCK: Claiming struct block_device: %s\n",
120 ib_dev->ibd_udev_path);
121
122 mode = FMODE_READ|FMODE_EXCL;
123 if (!ib_dev->ibd_readonly)
124 mode |= FMODE_WRITE;
125
126 bd = blkdev_get_by_path(ib_dev->ibd_udev_path, mode, ib_dev);
127 if (IS_ERR(bd)) {
128 ret = PTR_ERR(bd);
129 goto failed;
130 }
131
132
133
134
135 q = bdev_get_queue(bd);
136 limits = &dev_limits.limits;
137 limits->logical_block_size = bdev_logical_block_size(bd);
138 limits->max_hw_sectors = UINT_MAX;
139 limits->max_sectors = UINT_MAX;
140 dev_limits.hw_queue_depth = q->nr_requests;
141 dev_limits.queue_depth = q->nr_requests;
142
143 ib_dev->ibd_bd = bd;
144
145 dev = transport_add_device_to_core_hba(hba,
146 &iblock_template, se_dev, dev_flags, ib_dev,
147 &dev_limits, "IBLOCK", IBLOCK_VERSION);
148 if (!dev)
149 goto failed;
150
151
152
153
154
155
156 if (blk_queue_discard(q)) {
157 dev->se_sub_dev->se_dev_attrib.max_unmap_lba_count =
158 q->limits.max_discard_sectors;
159
160
161
162 dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count = 1;
163 dev->se_sub_dev->se_dev_attrib.unmap_granularity =
164 q->limits.discard_granularity >> 9;
165 dev->se_sub_dev->se_dev_attrib.unmap_granularity_alignment =
166 q->limits.discard_alignment;
167
168 pr_debug("IBLOCK: BLOCK Discard support available,"
169 " disabled by default\n");
170 }
171
172 if (blk_queue_nonrot(q))
173 dev->se_sub_dev->se_dev_attrib.is_nonrot = 1;
174
175 return dev;
176
177failed:
178 if (ib_dev->ibd_bio_set) {
179 bioset_free(ib_dev->ibd_bio_set);
180 ib_dev->ibd_bio_set = NULL;
181 }
182 ib_dev->ibd_bd = NULL;
183 return ERR_PTR(ret);
184}
185
186static void iblock_free_device(void *p)
187{
188 struct iblock_dev *ib_dev = p;
189
190 if (ib_dev->ibd_bd != NULL)
191 blkdev_put(ib_dev->ibd_bd, FMODE_WRITE|FMODE_READ|FMODE_EXCL);
192 if (ib_dev->ibd_bio_set != NULL)
193 bioset_free(ib_dev->ibd_bio_set);
194 kfree(ib_dev);
195}
196
197static unsigned long long iblock_emulate_read_cap_with_block_size(
198 struct se_device *dev,
199 struct block_device *bd,
200 struct request_queue *q)
201{
202 unsigned long long blocks_long = (div_u64(i_size_read(bd->bd_inode),
203 bdev_logical_block_size(bd)) - 1);
204 u32 block_size = bdev_logical_block_size(bd);
205
206 if (block_size == dev->se_sub_dev->se_dev_attrib.block_size)
207 return blocks_long;
208
209 switch (block_size) {
210 case 4096:
211 switch (dev->se_sub_dev->se_dev_attrib.block_size) {
212 case 2048:
213 blocks_long <<= 1;
214 break;
215 case 1024:
216 blocks_long <<= 2;
217 break;
218 case 512:
219 blocks_long <<= 3;
220 default:
221 break;
222 }
223 break;
224 case 2048:
225 switch (dev->se_sub_dev->se_dev_attrib.block_size) {
226 case 4096:
227 blocks_long >>= 1;
228 break;
229 case 1024:
230 blocks_long <<= 1;
231 break;
232 case 512:
233 blocks_long <<= 2;
234 break;
235 default:
236 break;
237 }
238 break;
239 case 1024:
240 switch (dev->se_sub_dev->se_dev_attrib.block_size) {
241 case 4096:
242 blocks_long >>= 2;
243 break;
244 case 2048:
245 blocks_long >>= 1;
246 break;
247 case 512:
248 blocks_long <<= 1;
249 break;
250 default:
251 break;
252 }
253 break;
254 case 512:
255 switch (dev->se_sub_dev->se_dev_attrib.block_size) {
256 case 4096:
257 blocks_long >>= 3;
258 break;
259 case 2048:
260 blocks_long >>= 2;
261 break;
262 case 1024:
263 blocks_long >>= 1;
264 break;
265 default:
266 break;
267 }
268 break;
269 default:
270 break;
271 }
272
273 return blocks_long;
274}
275
276static void iblock_end_io_flush(struct bio *bio, int err)
277{
278 struct se_cmd *cmd = bio->bi_private;
279
280 if (err)
281 pr_err("IBLOCK: cache flush failed: %d\n", err);
282
283 if (cmd) {
284 if (err) {
285 cmd->scsi_sense_reason =
286 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
287 target_complete_cmd(cmd, SAM_STAT_CHECK_CONDITION);
288 } else {
289 target_complete_cmd(cmd, SAM_STAT_GOOD);
290 }
291 }
292
293 bio_put(bio);
294}
295
296
297
298
299
300static int iblock_execute_sync_cache(struct se_cmd *cmd)
301{
302 struct iblock_dev *ib_dev = cmd->se_dev->dev_ptr;
303 int immed = (cmd->t_task_cdb[1] & 0x2);
304 struct bio *bio;
305
306
307
308
309
310 if (immed)
311 target_complete_cmd(cmd, SAM_STAT_GOOD);
312
313 bio = bio_alloc(GFP_KERNEL, 0);
314 bio->bi_end_io = iblock_end_io_flush;
315 bio->bi_bdev = ib_dev->ibd_bd;
316 if (!immed)
317 bio->bi_private = cmd;
318 submit_bio(WRITE_FLUSH, bio);
319 return 0;
320}
321
322static int iblock_execute_unmap(struct se_cmd *cmd)
323{
324 struct se_device *dev = cmd->se_dev;
325 struct iblock_dev *ibd = dev->dev_ptr;
326 unsigned char *buf, *ptr = NULL;
327 sector_t lba;
328 int size;
329 u32 range;
330 int ret = 0;
331 int dl, bd_dl;
332
333 if (cmd->data_length < 8) {
334 pr_warn("UNMAP parameter list length %u too small\n",
335 cmd->data_length);
336 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
337 return -EINVAL;
338 }
339
340 buf = transport_kmap_data_sg(cmd);
341
342 dl = get_unaligned_be16(&buf[0]);
343 bd_dl = get_unaligned_be16(&buf[2]);
344
345 size = cmd->data_length - 8;
346 if (bd_dl > size)
347 pr_warn("UNMAP parameter list length %u too small, ignoring bd_dl %u\n",
348 cmd->data_length, bd_dl);
349 else
350 size = bd_dl;
351
352 if (size / 16 > dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count) {
353 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
354 ret = -EINVAL;
355 goto err;
356 }
357
358
359 ptr = &buf[8];
360 pr_debug("UNMAP: Sub: %s Using dl: %u bd_dl: %u size: %u"
361 " ptr: %p\n", dev->transport->name, dl, bd_dl, size, ptr);
362
363 while (size >= 16) {
364 lba = get_unaligned_be64(&ptr[0]);
365 range = get_unaligned_be32(&ptr[8]);
366 pr_debug("UNMAP: Using lba: %llu and range: %u\n",
367 (unsigned long long)lba, range);
368
369 if (range > dev->se_sub_dev->se_dev_attrib.max_unmap_lba_count) {
370 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
371 ret = -EINVAL;
372 goto err;
373 }
374
375 if (lba + range > dev->transport->get_blocks(dev) + 1) {
376 cmd->scsi_sense_reason = TCM_ADDRESS_OUT_OF_RANGE;
377 ret = -EINVAL;
378 goto err;
379 }
380
381 ret = blkdev_issue_discard(ibd->ibd_bd, lba, range,
382 GFP_KERNEL, 0);
383 if (ret < 0) {
384 pr_err("blkdev_issue_discard() failed: %d\n",
385 ret);
386 goto err;
387 }
388
389 ptr += 16;
390 size -= 16;
391 }
392
393err:
394 transport_kunmap_data_sg(cmd);
395 if (!ret)
396 target_complete_cmd(cmd, GOOD);
397 return ret;
398}
399
400static int iblock_execute_write_same(struct se_cmd *cmd)
401{
402 struct iblock_dev *ibd = cmd->se_dev->dev_ptr;
403 int ret;
404
405 ret = blkdev_issue_discard(ibd->ibd_bd, cmd->t_task_lba,
406 spc_get_write_same_sectors(cmd), GFP_KERNEL,
407 0);
408 if (ret < 0) {
409 pr_debug("blkdev_issue_discard() failed for WRITE_SAME\n");
410 return ret;
411 }
412
413 target_complete_cmd(cmd, GOOD);
414 return 0;
415}
416
417enum {
418 Opt_udev_path, Opt_readonly, Opt_force, Opt_err
419};
420
421static match_table_t tokens = {
422 {Opt_udev_path, "udev_path=%s"},
423 {Opt_readonly, "readonly=%d"},
424 {Opt_force, "force=%d"},
425 {Opt_err, NULL}
426};
427
428static ssize_t iblock_set_configfs_dev_params(struct se_hba *hba,
429 struct se_subsystem_dev *se_dev,
430 const char *page, ssize_t count)
431{
432 struct iblock_dev *ib_dev = se_dev->se_dev_su_ptr;
433 char *orig, *ptr, *arg_p, *opts;
434 substring_t args[MAX_OPT_ARGS];
435 int ret = 0, token;
436 unsigned long tmp_readonly;
437
438 opts = kstrdup(page, GFP_KERNEL);
439 if (!opts)
440 return -ENOMEM;
441
442 orig = opts;
443
444 while ((ptr = strsep(&opts, ",\n")) != NULL) {
445 if (!*ptr)
446 continue;
447
448 token = match_token(ptr, tokens, args);
449 switch (token) {
450 case Opt_udev_path:
451 if (ib_dev->ibd_bd) {
452 pr_err("Unable to set udev_path= while"
453 " ib_dev->ibd_bd exists\n");
454 ret = -EEXIST;
455 goto out;
456 }
457 arg_p = match_strdup(&args[0]);
458 if (!arg_p) {
459 ret = -ENOMEM;
460 break;
461 }
462 snprintf(ib_dev->ibd_udev_path, SE_UDEV_PATH_LEN,
463 "%s", arg_p);
464 kfree(arg_p);
465 pr_debug("IBLOCK: Referencing UDEV path: %s\n",
466 ib_dev->ibd_udev_path);
467 ib_dev->ibd_flags |= IBDF_HAS_UDEV_PATH;
468 break;
469 case Opt_readonly:
470 arg_p = match_strdup(&args[0]);
471 if (!arg_p) {
472 ret = -ENOMEM;
473 break;
474 }
475 ret = strict_strtoul(arg_p, 0, &tmp_readonly);
476 kfree(arg_p);
477 if (ret < 0) {
478 pr_err("strict_strtoul() failed for"
479 " readonly=\n");
480 goto out;
481 }
482 ib_dev->ibd_readonly = tmp_readonly;
483 pr_debug("IBLOCK: readonly: %d\n", ib_dev->ibd_readonly);
484 break;
485 case Opt_force:
486 break;
487 default:
488 break;
489 }
490 }
491
492out:
493 kfree(orig);
494 return (!ret) ? count : ret;
495}
496
497static ssize_t iblock_check_configfs_dev_params(
498 struct se_hba *hba,
499 struct se_subsystem_dev *se_dev)
500{
501 struct iblock_dev *ibd = se_dev->se_dev_su_ptr;
502
503 if (!(ibd->ibd_flags & IBDF_HAS_UDEV_PATH)) {
504 pr_err("Missing udev_path= parameters for IBLOCK\n");
505 return -EINVAL;
506 }
507
508 return 0;
509}
510
511static ssize_t iblock_show_configfs_dev_params(
512 struct se_hba *hba,
513 struct se_subsystem_dev *se_dev,
514 char *b)
515{
516 struct iblock_dev *ibd = se_dev->se_dev_su_ptr;
517 struct block_device *bd = ibd->ibd_bd;
518 char buf[BDEVNAME_SIZE];
519 ssize_t bl = 0;
520
521 if (bd)
522 bl += sprintf(b + bl, "iBlock device: %s",
523 bdevname(bd, buf));
524 if (ibd->ibd_flags & IBDF_HAS_UDEV_PATH)
525 bl += sprintf(b + bl, " UDEV PATH: %s",
526 ibd->ibd_udev_path);
527 bl += sprintf(b + bl, " readonly: %d\n", ibd->ibd_readonly);
528
529 bl += sprintf(b + bl, " ");
530 if (bd) {
531 bl += sprintf(b + bl, "Major: %d Minor: %d %s\n",
532 MAJOR(bd->bd_dev), MINOR(bd->bd_dev), (!bd->bd_contains) ?
533 "" : (bd->bd_holder == ibd) ?
534 "CLAIMED: IBLOCK" : "CLAIMED: OS");
535 } else {
536 bl += sprintf(b + bl, "Major: 0 Minor: 0\n");
537 }
538
539 return bl;
540}
541
542static void iblock_complete_cmd(struct se_cmd *cmd)
543{
544 struct iblock_req *ibr = cmd->priv;
545 u8 status;
546
547 if (!atomic_dec_and_test(&ibr->pending))
548 return;
549
550 if (atomic_read(&ibr->ib_bio_err_cnt))
551 status = SAM_STAT_CHECK_CONDITION;
552 else
553 status = SAM_STAT_GOOD;
554
555 target_complete_cmd(cmd, status);
556 kfree(ibr);
557}
558
559static void iblock_bio_destructor(struct bio *bio)
560{
561 struct se_cmd *cmd = bio->bi_private;
562 struct iblock_dev *ib_dev = cmd->se_dev->dev_ptr;
563
564 bio_free(bio, ib_dev->ibd_bio_set);
565}
566
567static struct bio *
568iblock_get_bio(struct se_cmd *cmd, sector_t lba, u32 sg_num)
569{
570 struct iblock_dev *ib_dev = cmd->se_dev->dev_ptr;
571 struct bio *bio;
572
573
574
575
576
577 if (sg_num > BIO_MAX_PAGES)
578 sg_num = BIO_MAX_PAGES;
579
580 bio = bio_alloc_bioset(GFP_NOIO, sg_num, ib_dev->ibd_bio_set);
581 if (!bio) {
582 pr_err("Unable to allocate memory for bio\n");
583 return NULL;
584 }
585
586 bio->bi_bdev = ib_dev->ibd_bd;
587 bio->bi_private = cmd;
588 bio->bi_destructor = iblock_bio_destructor;
589 bio->bi_end_io = &iblock_bio_done;
590 bio->bi_sector = lba;
591 return bio;
592}
593
594static void iblock_submit_bios(struct bio_list *list, int rw)
595{
596 struct blk_plug plug;
597 struct bio *bio;
598
599 blk_start_plug(&plug);
600 while ((bio = bio_list_pop(list)))
601 submit_bio(rw, bio);
602 blk_finish_plug(&plug);
603}
604
605static int iblock_execute_rw(struct se_cmd *cmd)
606{
607 struct scatterlist *sgl = cmd->t_data_sg;
608 u32 sgl_nents = cmd->t_data_nents;
609 enum dma_data_direction data_direction = cmd->data_direction;
610 struct se_device *dev = cmd->se_dev;
611 struct iblock_req *ibr;
612 struct bio *bio;
613 struct bio_list list;
614 struct scatterlist *sg;
615 u32 sg_num = sgl_nents;
616 sector_t block_lba;
617 unsigned bio_cnt;
618 int rw;
619 int i;
620
621 if (data_direction == DMA_TO_DEVICE) {
622
623
624
625
626 if (dev->se_sub_dev->se_dev_attrib.emulate_write_cache == 0 ||
627 (dev->se_sub_dev->se_dev_attrib.emulate_fua_write > 0 &&
628 (cmd->se_cmd_flags & SCF_FUA)))
629 rw = WRITE_FUA;
630 else
631 rw = WRITE;
632 } else {
633 rw = READ;
634 }
635
636
637
638
639
640 if (dev->se_sub_dev->se_dev_attrib.block_size == 4096)
641 block_lba = (cmd->t_task_lba << 3);
642 else if (dev->se_sub_dev->se_dev_attrib.block_size == 2048)
643 block_lba = (cmd->t_task_lba << 2);
644 else if (dev->se_sub_dev->se_dev_attrib.block_size == 1024)
645 block_lba = (cmd->t_task_lba << 1);
646 else if (dev->se_sub_dev->se_dev_attrib.block_size == 512)
647 block_lba = cmd->t_task_lba;
648 else {
649 pr_err("Unsupported SCSI -> BLOCK LBA conversion:"
650 " %u\n", dev->se_sub_dev->se_dev_attrib.block_size);
651 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
652 return -ENOSYS;
653 }
654
655 ibr = kzalloc(sizeof(struct iblock_req), GFP_KERNEL);
656 if (!ibr)
657 goto fail;
658 cmd->priv = ibr;
659
660 bio = iblock_get_bio(cmd, block_lba, sgl_nents);
661 if (!bio)
662 goto fail_free_ibr;
663
664 bio_list_init(&list);
665 bio_list_add(&list, bio);
666
667 atomic_set(&ibr->pending, 2);
668 bio_cnt = 1;
669
670 for_each_sg(sgl, sg, sgl_nents, i) {
671
672
673
674
675
676 while (bio_add_page(bio, sg_page(sg), sg->length, sg->offset)
677 != sg->length) {
678 if (bio_cnt >= IBLOCK_MAX_BIO_PER_TASK) {
679 iblock_submit_bios(&list, rw);
680 bio_cnt = 0;
681 }
682
683 bio = iblock_get_bio(cmd, block_lba, sg_num);
684 if (!bio)
685 goto fail_put_bios;
686
687 atomic_inc(&ibr->pending);
688 bio_list_add(&list, bio);
689 bio_cnt++;
690 }
691
692
693 block_lba += sg->length >> IBLOCK_LBA_SHIFT;
694 sg_num--;
695 }
696
697 iblock_submit_bios(&list, rw);
698 iblock_complete_cmd(cmd);
699 return 0;
700
701fail_put_bios:
702 while ((bio = bio_list_pop(&list)))
703 bio_put(bio);
704fail_free_ibr:
705 kfree(ibr);
706 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
707fail:
708 return -ENOMEM;
709}
710
711static u32 iblock_get_device_rev(struct se_device *dev)
712{
713 return SCSI_SPC_2;
714}
715
716static u32 iblock_get_device_type(struct se_device *dev)
717{
718 return TYPE_DISK;
719}
720
721static sector_t iblock_get_blocks(struct se_device *dev)
722{
723 struct iblock_dev *ibd = dev->dev_ptr;
724 struct block_device *bd = ibd->ibd_bd;
725 struct request_queue *q = bdev_get_queue(bd);
726
727 return iblock_emulate_read_cap_with_block_size(dev, bd, q);
728}
729
730static void iblock_bio_done(struct bio *bio, int err)
731{
732 struct se_cmd *cmd = bio->bi_private;
733 struct iblock_req *ibr = cmd->priv;
734
735
736
737
738 if (!test_bit(BIO_UPTODATE, &bio->bi_flags) && !err)
739 err = -EIO;
740
741 if (err != 0) {
742 pr_err("test_bit(BIO_UPTODATE) failed for bio: %p,"
743 " err: %d\n", bio, err);
744
745
746
747 atomic_inc(&ibr->ib_bio_err_cnt);
748 smp_mb__after_atomic_inc();
749 }
750
751 bio_put(bio);
752
753 iblock_complete_cmd(cmd);
754}
755
756static struct spc_ops iblock_spc_ops = {
757 .execute_rw = iblock_execute_rw,
758 .execute_sync_cache = iblock_execute_sync_cache,
759 .execute_write_same = iblock_execute_write_same,
760 .execute_unmap = iblock_execute_unmap,
761};
762
763static int iblock_parse_cdb(struct se_cmd *cmd)
764{
765 return sbc_parse_cdb(cmd, &iblock_spc_ops);
766}
767
768static struct se_subsystem_api iblock_template = {
769 .name = "iblock",
770 .owner = THIS_MODULE,
771 .transport_type = TRANSPORT_PLUGIN_VHBA_PDEV,
772 .write_cache_emulated = 1,
773 .fua_write_emulated = 1,
774 .attach_hba = iblock_attach_hba,
775 .detach_hba = iblock_detach_hba,
776 .allocate_virtdevice = iblock_allocate_virtdevice,
777 .create_virtdevice = iblock_create_virtdevice,
778 .free_device = iblock_free_device,
779 .parse_cdb = iblock_parse_cdb,
780 .check_configfs_dev_params = iblock_check_configfs_dev_params,
781 .set_configfs_dev_params = iblock_set_configfs_dev_params,
782 .show_configfs_dev_params = iblock_show_configfs_dev_params,
783 .get_device_rev = iblock_get_device_rev,
784 .get_device_type = iblock_get_device_type,
785 .get_blocks = iblock_get_blocks,
786};
787
788static int __init iblock_module_init(void)
789{
790 return transport_subsystem_register(&iblock_template);
791}
792
793static void iblock_module_exit(void)
794{
795 transport_subsystem_release(&iblock_template);
796}
797
798MODULE_DESCRIPTION("TCM IBLOCK subsystem plugin");
799MODULE_AUTHOR("nab@Linux-iSCSI.org");
800MODULE_LICENSE("GPL");
801
802module_init(iblock_module_init);
803module_exit(iblock_module_exit);
804
