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27#include <linux/string.h>
28#include <linux/parser.h>
29#include <linux/timer.h>
30#include <linux/fs.h>
31#include <linux/blkdev.h>
32#include <linux/slab.h>
33#include <linux/spinlock.h>
34#include <linux/bio.h>
35#include <linux/genhd.h>
36#include <linux/file.h>
37#include <linux/module.h>
38#include <scsi/scsi.h>
39#include <scsi/scsi_host.h>
40#include <asm/unaligned.h>
41
42#include <target/target_core_base.h>
43#include <target/target_core_backend.h>
44#include <target/target_core_backend_configfs.h>
45
46#include "target_core_iblock.h"
47
48#define IBLOCK_MAX_BIO_PER_TASK 32
49#define IBLOCK_BIO_POOL_SIZE 128
50
51static inline struct iblock_dev *IBLOCK_DEV(struct se_device *dev)
52{
53 return container_of(dev, struct iblock_dev, dev);
54}
55
56
57static struct se_subsystem_api iblock_template;
58
59
60
61
62
63static int iblock_attach_hba(struct se_hba *hba, u32 host_id)
64{
65 pr_debug("CORE_HBA[%d] - TCM iBlock HBA Driver %s on"
66 " Generic Target Core Stack %s\n", hba->hba_id,
67 IBLOCK_VERSION, TARGET_CORE_MOD_VERSION);
68 return 0;
69}
70
71static void iblock_detach_hba(struct se_hba *hba)
72{
73}
74
75static struct se_device *iblock_alloc_device(struct se_hba *hba, const char *name)
76{
77 struct iblock_dev *ib_dev = NULL;
78
79 ib_dev = kzalloc(sizeof(struct iblock_dev), GFP_KERNEL);
80 if (!ib_dev) {
81 pr_err("Unable to allocate struct iblock_dev\n");
82 return NULL;
83 }
84
85 pr_debug( "IBLOCK: Allocated ib_dev for %s\n", name);
86
87 return &ib_dev->dev;
88}
89
90static int iblock_configure_device(struct se_device *dev)
91{
92 struct iblock_dev *ib_dev = IBLOCK_DEV(dev);
93 struct request_queue *q;
94 struct block_device *bd = NULL;
95 struct blk_integrity *bi;
96 fmode_t mode;
97 int ret = -ENOMEM;
98
99 if (!(ib_dev->ibd_flags & IBDF_HAS_UDEV_PATH)) {
100 pr_err("Missing udev_path= parameters for IBLOCK\n");
101 return -EINVAL;
102 }
103
104 ib_dev->ibd_bio_set = bioset_create(IBLOCK_BIO_POOL_SIZE, 0);
105 if (!ib_dev->ibd_bio_set) {
106 pr_err("IBLOCK: Unable to create bioset\n");
107 goto out;
108 }
109
110 pr_debug( "IBLOCK: Claiming struct block_device: %s\n",
111 ib_dev->ibd_udev_path);
112
113 mode = FMODE_READ|FMODE_EXCL;
114 if (!ib_dev->ibd_readonly)
115 mode |= FMODE_WRITE;
116
117 bd = blkdev_get_by_path(ib_dev->ibd_udev_path, mode, ib_dev);
118 if (IS_ERR(bd)) {
119 ret = PTR_ERR(bd);
120 goto out_free_bioset;
121 }
122 ib_dev->ibd_bd = bd;
123
124 q = bdev_get_queue(bd);
125
126 dev->dev_attrib.hw_block_size = bdev_logical_block_size(bd);
127 dev->dev_attrib.hw_max_sectors = queue_max_hw_sectors(q);
128 dev->dev_attrib.hw_queue_depth = q->nr_requests;
129
130
131
132
133
134
135 if (blk_queue_discard(q)) {
136 dev->dev_attrib.max_unmap_lba_count =
137 q->limits.max_discard_sectors;
138
139
140
141
142 dev->dev_attrib.max_unmap_block_desc_count = 1;
143 dev->dev_attrib.unmap_granularity =
144 q->limits.discard_granularity >> 9;
145 dev->dev_attrib.unmap_granularity_alignment =
146 q->limits.discard_alignment;
147
148 pr_debug("IBLOCK: BLOCK Discard support available,"
149 " disabled by default\n");
150 }
151
152
153
154
155 dev->dev_attrib.max_write_same_len = 0xFFFF;
156
157 if (blk_queue_nonrot(q))
158 dev->dev_attrib.is_nonrot = 1;
159
160 bi = bdev_get_integrity(bd);
161 if (bi) {
162 struct bio_set *bs = ib_dev->ibd_bio_set;
163
164 if (!strcmp(bi->name, "T10-DIF-TYPE3-IP") ||
165 !strcmp(bi->name, "T10-DIF-TYPE1-IP")) {
166 pr_err("IBLOCK export of blk_integrity: %s not"
167 " supported\n", bi->name);
168 ret = -ENOSYS;
169 goto out_blkdev_put;
170 }
171
172 if (!strcmp(bi->name, "T10-DIF-TYPE3-CRC")) {
173 dev->dev_attrib.pi_prot_type = TARGET_DIF_TYPE3_PROT;
174 } else if (!strcmp(bi->name, "T10-DIF-TYPE1-CRC")) {
175 dev->dev_attrib.pi_prot_type = TARGET_DIF_TYPE1_PROT;
176 }
177
178 if (dev->dev_attrib.pi_prot_type) {
179 if (bioset_integrity_create(bs, IBLOCK_BIO_POOL_SIZE) < 0) {
180 pr_err("Unable to allocate bioset for PI\n");
181 ret = -ENOMEM;
182 goto out_blkdev_put;
183 }
184 pr_debug("IBLOCK setup BIP bs->bio_integrity_pool: %p\n",
185 bs->bio_integrity_pool);
186 }
187 dev->dev_attrib.hw_pi_prot_type = dev->dev_attrib.pi_prot_type;
188 }
189
190 return 0;
191
192out_blkdev_put:
193 blkdev_put(ib_dev->ibd_bd, FMODE_WRITE|FMODE_READ|FMODE_EXCL);
194out_free_bioset:
195 bioset_free(ib_dev->ibd_bio_set);
196 ib_dev->ibd_bio_set = NULL;
197out:
198 return ret;
199}
200
201static void iblock_free_device(struct se_device *dev)
202{
203 struct iblock_dev *ib_dev = IBLOCK_DEV(dev);
204
205 if (ib_dev->ibd_bd != NULL)
206 blkdev_put(ib_dev->ibd_bd, FMODE_WRITE|FMODE_READ|FMODE_EXCL);
207 if (ib_dev->ibd_bio_set != NULL)
208 bioset_free(ib_dev->ibd_bio_set);
209
210 kfree(ib_dev);
211}
212
213static unsigned long long iblock_emulate_read_cap_with_block_size(
214 struct se_device *dev,
215 struct block_device *bd,
216 struct request_queue *q)
217{
218 unsigned long long blocks_long = (div_u64(i_size_read(bd->bd_inode),
219 bdev_logical_block_size(bd)) - 1);
220 u32 block_size = bdev_logical_block_size(bd);
221
222 if (block_size == dev->dev_attrib.block_size)
223 return blocks_long;
224
225 switch (block_size) {
226 case 4096:
227 switch (dev->dev_attrib.block_size) {
228 case 2048:
229 blocks_long <<= 1;
230 break;
231 case 1024:
232 blocks_long <<= 2;
233 break;
234 case 512:
235 blocks_long <<= 3;
236 default:
237 break;
238 }
239 break;
240 case 2048:
241 switch (dev->dev_attrib.block_size) {
242 case 4096:
243 blocks_long >>= 1;
244 break;
245 case 1024:
246 blocks_long <<= 1;
247 break;
248 case 512:
249 blocks_long <<= 2;
250 break;
251 default:
252 break;
253 }
254 break;
255 case 1024:
256 switch (dev->dev_attrib.block_size) {
257 case 4096:
258 blocks_long >>= 2;
259 break;
260 case 2048:
261 blocks_long >>= 1;
262 break;
263 case 512:
264 blocks_long <<= 1;
265 break;
266 default:
267 break;
268 }
269 break;
270 case 512:
271 switch (dev->dev_attrib.block_size) {
272 case 4096:
273 blocks_long >>= 3;
274 break;
275 case 2048:
276 blocks_long >>= 2;
277 break;
278 case 1024:
279 blocks_long >>= 1;
280 break;
281 default:
282 break;
283 }
284 break;
285 default:
286 break;
287 }
288
289 return blocks_long;
290}
291
292static void iblock_complete_cmd(struct se_cmd *cmd)
293{
294 struct iblock_req *ibr = cmd->priv;
295 u8 status;
296
297 if (!atomic_dec_and_test(&ibr->pending))
298 return;
299
300 if (atomic_read(&ibr->ib_bio_err_cnt))
301 status = SAM_STAT_CHECK_CONDITION;
302 else
303 status = SAM_STAT_GOOD;
304
305 target_complete_cmd(cmd, status);
306 kfree(ibr);
307}
308
309static void iblock_bio_done(struct bio *bio, int err)
310{
311 struct se_cmd *cmd = bio->bi_private;
312 struct iblock_req *ibr = cmd->priv;
313
314
315
316
317 if (!test_bit(BIO_UPTODATE, &bio->bi_flags) && !err)
318 err = -EIO;
319
320 if (err != 0) {
321 pr_err("test_bit(BIO_UPTODATE) failed for bio: %p,"
322 " err: %d\n", bio, err);
323
324
325
326 atomic_inc(&ibr->ib_bio_err_cnt);
327 smp_mb__after_atomic();
328 }
329
330 bio_put(bio);
331
332 iblock_complete_cmd(cmd);
333}
334
335static struct bio *
336iblock_get_bio(struct se_cmd *cmd, sector_t lba, u32 sg_num)
337{
338 struct iblock_dev *ib_dev = IBLOCK_DEV(cmd->se_dev);
339 struct bio *bio;
340
341
342
343
344
345 if (sg_num > BIO_MAX_PAGES)
346 sg_num = BIO_MAX_PAGES;
347
348 bio = bio_alloc_bioset(GFP_NOIO, sg_num, ib_dev->ibd_bio_set);
349 if (!bio) {
350 pr_err("Unable to allocate memory for bio\n");
351 return NULL;
352 }
353
354 bio->bi_bdev = ib_dev->ibd_bd;
355 bio->bi_private = cmd;
356 bio->bi_end_io = &iblock_bio_done;
357 bio->bi_iter.bi_sector = lba;
358
359 return bio;
360}
361
362static void iblock_submit_bios(struct bio_list *list, int rw)
363{
364 struct blk_plug plug;
365 struct bio *bio;
366
367 blk_start_plug(&plug);
368 while ((bio = bio_list_pop(list)))
369 submit_bio(rw, bio);
370 blk_finish_plug(&plug);
371}
372
373static void iblock_end_io_flush(struct bio *bio, int err)
374{
375 struct se_cmd *cmd = bio->bi_private;
376
377 if (err)
378 pr_err("IBLOCK: cache flush failed: %d\n", err);
379
380 if (cmd) {
381 if (err)
382 target_complete_cmd(cmd, SAM_STAT_CHECK_CONDITION);
383 else
384 target_complete_cmd(cmd, SAM_STAT_GOOD);
385 }
386
387 bio_put(bio);
388}
389
390
391
392
393
394static sense_reason_t
395iblock_execute_sync_cache(struct se_cmd *cmd)
396{
397 struct iblock_dev *ib_dev = IBLOCK_DEV(cmd->se_dev);
398 int immed = (cmd->t_task_cdb[1] & 0x2);
399 struct bio *bio;
400
401
402
403
404
405 if (immed)
406 target_complete_cmd(cmd, SAM_STAT_GOOD);
407
408 bio = bio_alloc(GFP_KERNEL, 0);
409 bio->bi_end_io = iblock_end_io_flush;
410 bio->bi_bdev = ib_dev->ibd_bd;
411 if (!immed)
412 bio->bi_private = cmd;
413 submit_bio(WRITE_FLUSH, bio);
414 return 0;
415}
416
417static sense_reason_t
418iblock_do_unmap(struct se_cmd *cmd, void *priv,
419 sector_t lba, sector_t nolb)
420{
421 struct block_device *bdev = priv;
422 int ret;
423
424 ret = blkdev_issue_discard(bdev, lba, nolb, GFP_KERNEL, 0);
425 if (ret < 0) {
426 pr_err("blkdev_issue_discard() failed: %d\n", ret);
427 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
428 }
429
430 return 0;
431}
432
433static sense_reason_t
434iblock_execute_unmap(struct se_cmd *cmd)
435{
436 struct block_device *bdev = IBLOCK_DEV(cmd->se_dev)->ibd_bd;
437
438 return sbc_execute_unmap(cmd, iblock_do_unmap, bdev);
439}
440
441static sense_reason_t
442iblock_execute_write_same_unmap(struct se_cmd *cmd)
443{
444 struct block_device *bdev = IBLOCK_DEV(cmd->se_dev)->ibd_bd;
445 sector_t lba = cmd->t_task_lba;
446 sector_t nolb = sbc_get_write_same_sectors(cmd);
447 int ret;
448
449 ret = iblock_do_unmap(cmd, bdev, lba, nolb);
450 if (ret)
451 return ret;
452
453 target_complete_cmd(cmd, GOOD);
454 return 0;
455}
456
457static sense_reason_t
458iblock_execute_write_same(struct se_cmd *cmd)
459{
460 struct iblock_req *ibr;
461 struct scatterlist *sg;
462 struct bio *bio;
463 struct bio_list list;
464 sector_t block_lba = cmd->t_task_lba;
465 sector_t sectors = sbc_get_write_same_sectors(cmd);
466
467 sg = &cmd->t_data_sg[0];
468
469 if (cmd->t_data_nents > 1 ||
470 sg->length != cmd->se_dev->dev_attrib.block_size) {
471 pr_err("WRITE_SAME: Illegal SGL t_data_nents: %u length: %u"
472 " block_size: %u\n", cmd->t_data_nents, sg->length,
473 cmd->se_dev->dev_attrib.block_size);
474 return TCM_INVALID_CDB_FIELD;
475 }
476
477 ibr = kzalloc(sizeof(struct iblock_req), GFP_KERNEL);
478 if (!ibr)
479 goto fail;
480 cmd->priv = ibr;
481
482 bio = iblock_get_bio(cmd, block_lba, 1);
483 if (!bio)
484 goto fail_free_ibr;
485
486 bio_list_init(&list);
487 bio_list_add(&list, bio);
488
489 atomic_set(&ibr->pending, 1);
490
491 while (sectors) {
492 while (bio_add_page(bio, sg_page(sg), sg->length, sg->offset)
493 != sg->length) {
494
495 bio = iblock_get_bio(cmd, block_lba, 1);
496 if (!bio)
497 goto fail_put_bios;
498
499 atomic_inc(&ibr->pending);
500 bio_list_add(&list, bio);
501 }
502
503
504 block_lba += sg->length >> IBLOCK_LBA_SHIFT;
505 sectors -= 1;
506 }
507
508 iblock_submit_bios(&list, WRITE);
509 return 0;
510
511fail_put_bios:
512 while ((bio = bio_list_pop(&list)))
513 bio_put(bio);
514fail_free_ibr:
515 kfree(ibr);
516fail:
517 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
518}
519
520enum {
521 Opt_udev_path, Opt_readonly, Opt_force, Opt_err
522};
523
524static match_table_t tokens = {
525 {Opt_udev_path, "udev_path=%s"},
526 {Opt_readonly, "readonly=%d"},
527 {Opt_force, "force=%d"},
528 {Opt_err, NULL}
529};
530
531static ssize_t iblock_set_configfs_dev_params(struct se_device *dev,
532 const char *page, ssize_t count)
533{
534 struct iblock_dev *ib_dev = IBLOCK_DEV(dev);
535 char *orig, *ptr, *arg_p, *opts;
536 substring_t args[MAX_OPT_ARGS];
537 int ret = 0, token;
538 unsigned long tmp_readonly;
539
540 opts = kstrdup(page, GFP_KERNEL);
541 if (!opts)
542 return -ENOMEM;
543
544 orig = opts;
545
546 while ((ptr = strsep(&opts, ",\n")) != NULL) {
547 if (!*ptr)
548 continue;
549
550 token = match_token(ptr, tokens, args);
551 switch (token) {
552 case Opt_udev_path:
553 if (ib_dev->ibd_bd) {
554 pr_err("Unable to set udev_path= while"
555 " ib_dev->ibd_bd exists\n");
556 ret = -EEXIST;
557 goto out;
558 }
559 if (match_strlcpy(ib_dev->ibd_udev_path, &args[0],
560 SE_UDEV_PATH_LEN) == 0) {
561 ret = -EINVAL;
562 break;
563 }
564 pr_debug("IBLOCK: Referencing UDEV path: %s\n",
565 ib_dev->ibd_udev_path);
566 ib_dev->ibd_flags |= IBDF_HAS_UDEV_PATH;
567 break;
568 case Opt_readonly:
569 arg_p = match_strdup(&args[0]);
570 if (!arg_p) {
571 ret = -ENOMEM;
572 break;
573 }
574 ret = kstrtoul(arg_p, 0, &tmp_readonly);
575 kfree(arg_p);
576 if (ret < 0) {
577 pr_err("kstrtoul() failed for"
578 " readonly=\n");
579 goto out;
580 }
581 ib_dev->ibd_readonly = tmp_readonly;
582 pr_debug("IBLOCK: readonly: %d\n", ib_dev->ibd_readonly);
583 break;
584 case Opt_force:
585 break;
586 default:
587 break;
588 }
589 }
590
591out:
592 kfree(orig);
593 return (!ret) ? count : ret;
594}
595
596static ssize_t iblock_show_configfs_dev_params(struct se_device *dev, char *b)
597{
598 struct iblock_dev *ib_dev = IBLOCK_DEV(dev);
599 struct block_device *bd = ib_dev->ibd_bd;
600 char buf[BDEVNAME_SIZE];
601 ssize_t bl = 0;
602
603 if (bd)
604 bl += sprintf(b + bl, "iBlock device: %s",
605 bdevname(bd, buf));
606 if (ib_dev->ibd_flags & IBDF_HAS_UDEV_PATH)
607 bl += sprintf(b + bl, " UDEV PATH: %s",
608 ib_dev->ibd_udev_path);
609 bl += sprintf(b + bl, " readonly: %d\n", ib_dev->ibd_readonly);
610
611 bl += sprintf(b + bl, " ");
612 if (bd) {
613 bl += sprintf(b + bl, "Major: %d Minor: %d %s\n",
614 MAJOR(bd->bd_dev), MINOR(bd->bd_dev), (!bd->bd_contains) ?
615 "" : (bd->bd_holder == ib_dev) ?
616 "CLAIMED: IBLOCK" : "CLAIMED: OS");
617 } else {
618 bl += sprintf(b + bl, "Major: 0 Minor: 0\n");
619 }
620
621 return bl;
622}
623
624static int
625iblock_alloc_bip(struct se_cmd *cmd, struct bio *bio)
626{
627 struct se_device *dev = cmd->se_dev;
628 struct blk_integrity *bi;
629 struct bio_integrity_payload *bip;
630 struct iblock_dev *ib_dev = IBLOCK_DEV(dev);
631 struct scatterlist *sg;
632 int i, rc;
633
634 bi = bdev_get_integrity(ib_dev->ibd_bd);
635 if (!bi) {
636 pr_err("Unable to locate bio_integrity\n");
637 return -ENODEV;
638 }
639
640 bip = bio_integrity_alloc(bio, GFP_NOIO, cmd->t_prot_nents);
641 if (!bip) {
642 pr_err("Unable to allocate bio_integrity_payload\n");
643 return -ENOMEM;
644 }
645
646 bip->bip_iter.bi_size = (cmd->data_length / dev->dev_attrib.block_size) *
647 dev->prot_length;
648 bip->bip_iter.bi_sector = bio->bi_iter.bi_sector;
649
650 pr_debug("IBLOCK BIP Size: %u Sector: %llu\n", bip->bip_iter.bi_size,
651 (unsigned long long)bip->bip_iter.bi_sector);
652
653 for_each_sg(cmd->t_prot_sg, sg, cmd->t_prot_nents, i) {
654
655 rc = bio_integrity_add_page(bio, sg_page(sg), sg->length,
656 sg->offset);
657 if (rc != sg->length) {
658 pr_err("bio_integrity_add_page() failed; %d\n", rc);
659 return -ENOMEM;
660 }
661
662 pr_debug("Added bio integrity page: %p length: %d offset; %d\n",
663 sg_page(sg), sg->length, sg->offset);
664 }
665
666 return 0;
667}
668
669static sense_reason_t
670iblock_execute_rw(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents,
671 enum dma_data_direction data_direction)
672{
673 struct se_device *dev = cmd->se_dev;
674 struct iblock_req *ibr;
675 struct bio *bio, *bio_start;
676 struct bio_list list;
677 struct scatterlist *sg;
678 u32 sg_num = sgl_nents;
679 sector_t block_lba;
680 unsigned bio_cnt;
681 int rw = 0;
682 int i;
683
684 if (data_direction == DMA_TO_DEVICE) {
685 struct iblock_dev *ib_dev = IBLOCK_DEV(dev);
686 struct request_queue *q = bdev_get_queue(ib_dev->ibd_bd);
687
688
689
690
691 if (q->flush_flags & REQ_FUA) {
692 if (cmd->se_cmd_flags & SCF_FUA)
693 rw = WRITE_FUA;
694 else if (!(q->flush_flags & REQ_FLUSH))
695 rw = WRITE_FUA;
696 else
697 rw = WRITE;
698 } else {
699 rw = WRITE;
700 }
701 } else {
702 rw = READ;
703 }
704
705
706
707
708
709 if (dev->dev_attrib.block_size == 4096)
710 block_lba = (cmd->t_task_lba << 3);
711 else if (dev->dev_attrib.block_size == 2048)
712 block_lba = (cmd->t_task_lba << 2);
713 else if (dev->dev_attrib.block_size == 1024)
714 block_lba = (cmd->t_task_lba << 1);
715 else if (dev->dev_attrib.block_size == 512)
716 block_lba = cmd->t_task_lba;
717 else {
718 pr_err("Unsupported SCSI -> BLOCK LBA conversion:"
719 " %u\n", dev->dev_attrib.block_size);
720 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
721 }
722
723 ibr = kzalloc(sizeof(struct iblock_req), GFP_KERNEL);
724 if (!ibr)
725 goto fail;
726 cmd->priv = ibr;
727
728 if (!sgl_nents) {
729 atomic_set(&ibr->pending, 1);
730 iblock_complete_cmd(cmd);
731 return 0;
732 }
733
734 bio = iblock_get_bio(cmd, block_lba, sgl_nents);
735 if (!bio)
736 goto fail_free_ibr;
737
738 bio_start = bio;
739 bio_list_init(&list);
740 bio_list_add(&list, bio);
741
742 atomic_set(&ibr->pending, 2);
743 bio_cnt = 1;
744
745 for_each_sg(sgl, sg, sgl_nents, i) {
746
747
748
749
750
751 while (bio_add_page(bio, sg_page(sg), sg->length, sg->offset)
752 != sg->length) {
753 if (bio_cnt >= IBLOCK_MAX_BIO_PER_TASK) {
754 iblock_submit_bios(&list, rw);
755 bio_cnt = 0;
756 }
757
758 bio = iblock_get_bio(cmd, block_lba, sg_num);
759 if (!bio)
760 goto fail_put_bios;
761
762 atomic_inc(&ibr->pending);
763 bio_list_add(&list, bio);
764 bio_cnt++;
765 }
766
767
768 block_lba += sg->length >> IBLOCK_LBA_SHIFT;
769 sg_num--;
770 }
771
772 if (cmd->prot_type) {
773 int rc = iblock_alloc_bip(cmd, bio_start);
774 if (rc)
775 goto fail_put_bios;
776 }
777
778 iblock_submit_bios(&list, rw);
779 iblock_complete_cmd(cmd);
780 return 0;
781
782fail_put_bios:
783 while ((bio = bio_list_pop(&list)))
784 bio_put(bio);
785fail_free_ibr:
786 kfree(ibr);
787fail:
788 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
789}
790
791static sector_t iblock_get_blocks(struct se_device *dev)
792{
793 struct iblock_dev *ib_dev = IBLOCK_DEV(dev);
794 struct block_device *bd = ib_dev->ibd_bd;
795 struct request_queue *q = bdev_get_queue(bd);
796
797 return iblock_emulate_read_cap_with_block_size(dev, bd, q);
798}
799
800static sector_t iblock_get_alignment_offset_lbas(struct se_device *dev)
801{
802 struct iblock_dev *ib_dev = IBLOCK_DEV(dev);
803 struct block_device *bd = ib_dev->ibd_bd;
804 int ret;
805
806 ret = bdev_alignment_offset(bd);
807 if (ret == -1)
808 return 0;
809
810
811 return ret / bdev_logical_block_size(bd);
812}
813
814static unsigned int iblock_get_lbppbe(struct se_device *dev)
815{
816 struct iblock_dev *ib_dev = IBLOCK_DEV(dev);
817 struct block_device *bd = ib_dev->ibd_bd;
818 int logs_per_phys = bdev_physical_block_size(bd) / bdev_logical_block_size(bd);
819
820 return ilog2(logs_per_phys);
821}
822
823static unsigned int iblock_get_io_min(struct se_device *dev)
824{
825 struct iblock_dev *ib_dev = IBLOCK_DEV(dev);
826 struct block_device *bd = ib_dev->ibd_bd;
827
828 return bdev_io_min(bd);
829}
830
831static unsigned int iblock_get_io_opt(struct se_device *dev)
832{
833 struct iblock_dev *ib_dev = IBLOCK_DEV(dev);
834 struct block_device *bd = ib_dev->ibd_bd;
835
836 return bdev_io_opt(bd);
837}
838
839static struct sbc_ops iblock_sbc_ops = {
840 .execute_rw = iblock_execute_rw,
841 .execute_sync_cache = iblock_execute_sync_cache,
842 .execute_write_same = iblock_execute_write_same,
843 .execute_write_same_unmap = iblock_execute_write_same_unmap,
844 .execute_unmap = iblock_execute_unmap,
845};
846
847static sense_reason_t
848iblock_parse_cdb(struct se_cmd *cmd)
849{
850 return sbc_parse_cdb(cmd, &iblock_sbc_ops);
851}
852
853static bool iblock_get_write_cache(struct se_device *dev)
854{
855 struct iblock_dev *ib_dev = IBLOCK_DEV(dev);
856 struct block_device *bd = ib_dev->ibd_bd;
857 struct request_queue *q = bdev_get_queue(bd);
858
859 return q->flush_flags & REQ_FLUSH;
860}
861
862DEF_TB_DEFAULT_ATTRIBS(iblock);
863
864static struct configfs_attribute *iblock_backend_dev_attrs[] = {
865 &iblock_dev_attrib_emulate_model_alias.attr,
866 &iblock_dev_attrib_emulate_dpo.attr,
867 &iblock_dev_attrib_emulate_fua_write.attr,
868 &iblock_dev_attrib_emulate_fua_read.attr,
869 &iblock_dev_attrib_emulate_write_cache.attr,
870 &iblock_dev_attrib_emulate_ua_intlck_ctrl.attr,
871 &iblock_dev_attrib_emulate_tas.attr,
872 &iblock_dev_attrib_emulate_tpu.attr,
873 &iblock_dev_attrib_emulate_tpws.attr,
874 &iblock_dev_attrib_emulate_caw.attr,
875 &iblock_dev_attrib_emulate_3pc.attr,
876 &iblock_dev_attrib_pi_prot_type.attr,
877 &iblock_dev_attrib_hw_pi_prot_type.attr,
878 &iblock_dev_attrib_pi_prot_format.attr,
879 &iblock_dev_attrib_enforce_pr_isids.attr,
880 &iblock_dev_attrib_is_nonrot.attr,
881 &iblock_dev_attrib_emulate_rest_reord.attr,
882 &iblock_dev_attrib_force_pr_aptpl.attr,
883 &iblock_dev_attrib_hw_block_size.attr,
884 &iblock_dev_attrib_block_size.attr,
885 &iblock_dev_attrib_hw_max_sectors.attr,
886 &iblock_dev_attrib_optimal_sectors.attr,
887 &iblock_dev_attrib_hw_queue_depth.attr,
888 &iblock_dev_attrib_queue_depth.attr,
889 &iblock_dev_attrib_max_unmap_lba_count.attr,
890 &iblock_dev_attrib_max_unmap_block_desc_count.attr,
891 &iblock_dev_attrib_unmap_granularity.attr,
892 &iblock_dev_attrib_unmap_granularity_alignment.attr,
893 &iblock_dev_attrib_max_write_same_len.attr,
894 NULL,
895};
896
897static struct se_subsystem_api iblock_template = {
898 .name = "iblock",
899 .inquiry_prod = "IBLOCK",
900 .inquiry_rev = IBLOCK_VERSION,
901 .owner = THIS_MODULE,
902 .transport_type = TRANSPORT_PLUGIN_VHBA_PDEV,
903 .attach_hba = iblock_attach_hba,
904 .detach_hba = iblock_detach_hba,
905 .alloc_device = iblock_alloc_device,
906 .configure_device = iblock_configure_device,
907 .free_device = iblock_free_device,
908 .parse_cdb = iblock_parse_cdb,
909 .set_configfs_dev_params = iblock_set_configfs_dev_params,
910 .show_configfs_dev_params = iblock_show_configfs_dev_params,
911 .get_device_type = sbc_get_device_type,
912 .get_blocks = iblock_get_blocks,
913 .get_alignment_offset_lbas = iblock_get_alignment_offset_lbas,
914 .get_lbppbe = iblock_get_lbppbe,
915 .get_io_min = iblock_get_io_min,
916 .get_io_opt = iblock_get_io_opt,
917 .get_write_cache = iblock_get_write_cache,
918};
919
920static int __init iblock_module_init(void)
921{
922 struct target_backend_cits *tbc = &iblock_template.tb_cits;
923
924 target_core_setup_sub_cits(&iblock_template);
925 tbc->tb_dev_attrib_cit.ct_attrs = iblock_backend_dev_attrs;
926
927 return transport_subsystem_register(&iblock_template);
928}
929
930static void __exit iblock_module_exit(void)
931{
932 transport_subsystem_release(&iblock_template);
933}
934
935MODULE_DESCRIPTION("TCM IBLOCK subsystem plugin");
936MODULE_AUTHOR("nab@Linux-iSCSI.org");
937MODULE_LICENSE("GPL");
938
939module_init(iblock_module_init);
940module_exit(iblock_module_exit);
941
