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ath10k: advertise force AP scan feature
[linux-2.6/btrfs-unstable.git] / drivers / target / target_core_iblock.c
blobabe4eb997a842240f8b76875cc7cfbb7f55dbe0f
1 /*******************************************************************************
2 * Filename: target_core_iblock.c
3 *
4 * This file contains the Storage Engine <-> Linux BlockIO transport
5 * specific functions.
6 *
7 * (c) Copyright 2003-2013 Datera, Inc.
8 *
9 * Nicholas A. Bellinger <nab@kernel.org>
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
15 *
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
20 *
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
24 *
25 ******************************************************************************/
26
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_proto.h>
39 #include <asm/unaligned.h>
40
41 #include <target/target_core_base.h>
42 #include <target/target_core_backend.h>
43
44 #include "target_core_iblock.h"
45
46 #define IBLOCK_MAX_BIO_PER_TASK 32 /* max # of bios to submit at a time */
47 #define IBLOCK_BIO_POOL_SIZE 128
48
49 static inline struct iblock_dev *IBLOCK_DEV(struct se_device *dev)
50 {
51 return container_of(dev, struct iblock_dev, dev);
52 }
53
54
55 static int iblock_attach_hba(struct se_hba *hba, u32 host_id)
56 {
57 pr_debug("CORE_HBA[%d] - TCM iBlock HBA Driver %s on"
58 " Generic Target Core Stack %s\n", hba->hba_id,
59 IBLOCK_VERSION, TARGET_CORE_VERSION);
60 return 0;
61 }
62
63 static void iblock_detach_hba(struct se_hba *hba)
64 {
65 }
66
67 static struct se_device *iblock_alloc_device(struct se_hba *hba, const char *name)
68 {
69 struct iblock_dev *ib_dev = NULL;
70
71 ib_dev = kzalloc(sizeof(struct iblock_dev), GFP_KERNEL);
72 if (!ib_dev) {
73 pr_err("Unable to allocate struct iblock_dev\n");
74 return NULL;
75 }
76
77 pr_debug( "IBLOCK: Allocated ib_dev for %s\n", name);
78
79 return &ib_dev->dev;
80 }
81
82 static int iblock_configure_device(struct se_device *dev)
83 {
84 struct iblock_dev *ib_dev = IBLOCK_DEV(dev);
85 struct request_queue *q;
86 struct block_device *bd = NULL;
87 struct blk_integrity *bi;
88 fmode_t mode;
89 int ret = -ENOMEM;
90
91 if (!(ib_dev->ibd_flags & IBDF_HAS_UDEV_PATH)) {
92 pr_err("Missing udev_path= parameters for IBLOCK\n");
93 return -EINVAL;
94 }
95
96 ib_dev->ibd_bio_set = bioset_create(IBLOCK_BIO_POOL_SIZE, 0);
97 if (!ib_dev->ibd_bio_set) {
98 pr_err("IBLOCK: Unable to create bioset\n");
99 goto out;
100 }
101
102 pr_debug( "IBLOCK: Claiming struct block_device: %s\n",
103 ib_dev->ibd_udev_path);
104
105 mode = FMODE_READ|FMODE_EXCL;
106 if (!ib_dev->ibd_readonly)
107 mode |= FMODE_WRITE;
108 else
109 dev->dev_flags |= DF_READ_ONLY;
110
111 bd = blkdev_get_by_path(ib_dev->ibd_udev_path, mode, ib_dev);
112 if (IS_ERR(bd)) {
113 ret = PTR_ERR(bd);
114 goto out_free_bioset;
115 }
116 ib_dev->ibd_bd = bd;
117
118 q = bdev_get_queue(bd);
119
120 dev->dev_attrib.hw_block_size = bdev_logical_block_size(bd);
121 dev->dev_attrib.hw_max_sectors = queue_max_hw_sectors(q);
122 dev->dev_attrib.hw_queue_depth = q->nr_requests;
123
124 if (target_configure_unmap_from_queue(&dev->dev_attrib, q,
125 dev->dev_attrib.hw_block_size))
126 pr_debug("IBLOCK: BLOCK Discard support available,"
127 " disabled by default\n");
128
129 /*
130 * Enable write same emulation for IBLOCK and use 0xFFFF as
131 * the smaller WRITE_SAME(10) only has a two-byte block count.
132 */
133 dev->dev_attrib.max_write_same_len = 0xFFFF;
134
135 if (blk_queue_nonrot(q))
136 dev->dev_attrib.is_nonrot = 1;
137
138 bi = bdev_get_integrity(bd);
139 if (bi) {
140 struct bio_set *bs = ib_dev->ibd_bio_set;
141
142 if (!strcmp(bi->profile->name, "T10-DIF-TYPE3-IP") ||
143 !strcmp(bi->profile->name, "T10-DIF-TYPE1-IP")) {
144 pr_err("IBLOCK export of blk_integrity: %s not"
145 " supported\n", bi->profile->name);
146 ret = -ENOSYS;
147 goto out_blkdev_put;
148 }
149
150 if (!strcmp(bi->profile->name, "T10-DIF-TYPE3-CRC")) {
151 dev->dev_attrib.pi_prot_type = TARGET_DIF_TYPE3_PROT;
152 } else if (!strcmp(bi->profile->name, "T10-DIF-TYPE1-CRC")) {
153 dev->dev_attrib.pi_prot_type = TARGET_DIF_TYPE1_PROT;
154 }
155
156 if (dev->dev_attrib.pi_prot_type) {
157 if (bioset_integrity_create(bs, IBLOCK_BIO_POOL_SIZE) < 0) {
158 pr_err("Unable to allocate bioset for PI\n");
159 ret = -ENOMEM;
160 goto out_blkdev_put;
161 }
162 pr_debug("IBLOCK setup BIP bs->bio_integrity_pool: %p\n",
163 bs->bio_integrity_pool);
164 }
165 dev->dev_attrib.hw_pi_prot_type = dev->dev_attrib.pi_prot_type;
166 }
167
168 return 0;
169
170 out_blkdev_put:
171 blkdev_put(ib_dev->ibd_bd, FMODE_WRITE|FMODE_READ|FMODE_EXCL);
172 out_free_bioset:
173 bioset_free(ib_dev->ibd_bio_set);
174 ib_dev->ibd_bio_set = NULL;
175 out:
176 return ret;
177 }
178
179 static void iblock_dev_call_rcu(struct rcu_head *p)
180 {
181 struct se_device *dev = container_of(p, struct se_device, rcu_head);
182 struct iblock_dev *ib_dev = IBLOCK_DEV(dev);
183
184 kfree(ib_dev);
185 }
186
187 static void iblock_free_device(struct se_device *dev)
188 {
189 struct iblock_dev *ib_dev = IBLOCK_DEV(dev);
190
191 if (ib_dev->ibd_bd != NULL)
192 blkdev_put(ib_dev->ibd_bd, FMODE_WRITE|FMODE_READ|FMODE_EXCL);
193 if (ib_dev->ibd_bio_set != NULL)
194 bioset_free(ib_dev->ibd_bio_set);
195
196 call_rcu(&dev->rcu_head, iblock_dev_call_rcu);
197 }
198
199 static unsigned long long iblock_emulate_read_cap_with_block_size(
200 struct se_device *dev,
201 struct block_device *bd,
202 struct request_queue *q)
203 {
204 unsigned long long blocks_long = (div_u64(i_size_read(bd->bd_inode),
205 bdev_logical_block_size(bd)) - 1);
206 u32 block_size = bdev_logical_block_size(bd);
207
208 if (block_size == dev->dev_attrib.block_size)
209 return blocks_long;
210
211 switch (block_size) {
212 case 4096:
213 switch (dev->dev_attrib.block_size) {
214 case 2048:
215 blocks_long <<= 1;
216 break;
217 case 1024:
218 blocks_long <<= 2;
219 break;
220 case 512:
221 blocks_long <<= 3;
222 default:
223 break;
224 }
225 break;
226 case 2048:
227 switch (dev->dev_attrib.block_size) {
228 case 4096:
229 blocks_long >>= 1;
230 break;
231 case 1024:
232 blocks_long <<= 1;
233 break;
234 case 512:
235 blocks_long <<= 2;
236 break;
237 default:
238 break;
239 }
240 break;
241 case 1024:
242 switch (dev->dev_attrib.block_size) {
243 case 4096:
244 blocks_long >>= 2;
245 break;
246 case 2048:
247 blocks_long >>= 1;
248 break;
249 case 512:
250 blocks_long <<= 1;
251 break;
252 default:
253 break;
254 }
255 break;
256 case 512:
257 switch (dev->dev_attrib.block_size) {
258 case 4096:
259 blocks_long >>= 3;
260 break;
261 case 2048:
262 blocks_long >>= 2;
263 break;
264 case 1024:
265 blocks_long >>= 1;
266 break;
267 default:
268 break;
269 }
270 break;
271 default:
272 break;
273 }
274
275 return blocks_long;
276 }
277
278 static void iblock_complete_cmd(struct se_cmd *cmd)
279 {
280 struct iblock_req *ibr = cmd->priv;
281 u8 status;
282
283 if (!atomic_dec_and_test(&ibr->pending))
284 return;
285
286 if (atomic_read(&ibr->ib_bio_err_cnt))
287 status = SAM_STAT_CHECK_CONDITION;
288 else
289 status = SAM_STAT_GOOD;
290
291 target_complete_cmd(cmd, status);
292 kfree(ibr);
293 }
294
295 static void iblock_bio_done(struct bio *bio)
296 {
297 struct se_cmd *cmd = bio->bi_private;
298 struct iblock_req *ibr = cmd->priv;
299
300 if (bio->bi_error) {
301 pr_err("bio error: %p, err: %d\n", bio, bio->bi_error);
302 /*
303 * Bump the ib_bio_err_cnt and release bio.
304 */
305 atomic_inc(&ibr->ib_bio_err_cnt);
306 smp_mb__after_atomic();
307 }
308
309 bio_put(bio);
310
311 iblock_complete_cmd(cmd);
312 }
313
314 static struct bio *
315 iblock_get_bio(struct se_cmd *cmd, sector_t lba, u32 sg_num)
316 {
317 struct iblock_dev *ib_dev = IBLOCK_DEV(cmd->se_dev);
318 struct bio *bio;
319
320 /*
321 * Only allocate as many vector entries as the bio code allows us to,
322 * we'll loop later on until we have handled the whole request.
323 */
324 if (sg_num > BIO_MAX_PAGES)
325 sg_num = BIO_MAX_PAGES;
326
327 bio = bio_alloc_bioset(GFP_NOIO, sg_num, ib_dev->ibd_bio_set);
328 if (!bio) {
329 pr_err("Unable to allocate memory for bio\n");
330 return NULL;
331 }
332
333 bio->bi_bdev = ib_dev->ibd_bd;
334 bio->bi_private = cmd;
335 bio->bi_end_io = &iblock_bio_done;
336 bio->bi_iter.bi_sector = lba;
337
338 return bio;
339 }
340
341 static void iblock_submit_bios(struct bio_list *list, int rw)
342 {
343 struct blk_plug plug;
344 struct bio *bio;
345
346 blk_start_plug(&plug);
347 while ((bio = bio_list_pop(list)))
348 submit_bio(rw, bio);
349 blk_finish_plug(&plug);
350 }
351
352 static void iblock_end_io_flush(struct bio *bio)
353 {
354 struct se_cmd *cmd = bio->bi_private;
355
356 if (bio->bi_error)
357 pr_err("IBLOCK: cache flush failed: %d\n", bio->bi_error);
358
359 if (cmd) {
360 if (bio->bi_error)
361 target_complete_cmd(cmd, SAM_STAT_CHECK_CONDITION);
362 else
363 target_complete_cmd(cmd, SAM_STAT_GOOD);
364 }
365
366 bio_put(bio);
367 }
368
369 /*
370 * Implement SYCHRONIZE CACHE. Note that we can't handle lba ranges and must
371 * always flush the whole cache.
372 */
373 static sense_reason_t
374 iblock_execute_sync_cache(struct se_cmd *cmd)
375 {
376 struct iblock_dev *ib_dev = IBLOCK_DEV(cmd->se_dev);
377 int immed = (cmd->t_task_cdb[1] & 0x2);
378 struct bio *bio;
379
380 /*
381 * If the Immediate bit is set, queue up the GOOD response
382 * for this SYNCHRONIZE_CACHE op.
383 */
384 if (immed)
385 target_complete_cmd(cmd, SAM_STAT_GOOD);
386
387 bio = bio_alloc(GFP_KERNEL, 0);
388 bio->bi_end_io = iblock_end_io_flush;
389 bio->bi_bdev = ib_dev->ibd_bd;
390 if (!immed)
391 bio->bi_private = cmd;
392 submit_bio(WRITE_FLUSH, bio);
393 return 0;
394 }
395
396 static sense_reason_t
397 iblock_execute_unmap(struct se_cmd *cmd, sector_t lba, sector_t nolb)
398 {
399 struct block_device *bdev = IBLOCK_DEV(cmd->se_dev)->ibd_bd;
400 struct se_device *dev = cmd->se_dev;
401 int ret;
402
403 ret = blkdev_issue_discard(bdev,
404 target_to_linux_sector(dev, lba),
405 target_to_linux_sector(dev, nolb),
406 GFP_KERNEL, 0);
407 if (ret < 0) {
408 pr_err("blkdev_issue_discard() failed: %d\n", ret);
409 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
410 }
411
412 return 0;
413 }
414
415 static sense_reason_t
416 iblock_execute_write_same(struct se_cmd *cmd)
417 {
418 struct iblock_req *ibr;
419 struct scatterlist *sg;
420 struct bio *bio;
421 struct bio_list list;
422 struct se_device *dev = cmd->se_dev;
423 sector_t block_lba = target_to_linux_sector(dev, cmd->t_task_lba);
424 sector_t sectors = target_to_linux_sector(dev,
425 sbc_get_write_same_sectors(cmd));
426
427 if (cmd->prot_op) {
428 pr_err("WRITE_SAME: Protection information with IBLOCK"
429 " backends not supported\n");
430 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
431 }
432 sg = &cmd->t_data_sg[0];
433
434 if (cmd->t_data_nents > 1 ||
435 sg->length != cmd->se_dev->dev_attrib.block_size) {
436 pr_err("WRITE_SAME: Illegal SGL t_data_nents: %u length: %u"
437 " block_size: %u\n", cmd->t_data_nents, sg->length,
438 cmd->se_dev->dev_attrib.block_size);
439 return TCM_INVALID_CDB_FIELD;
440 }
441
442 ibr = kzalloc(sizeof(struct iblock_req), GFP_KERNEL);
443 if (!ibr)
444 goto fail;
445 cmd->priv = ibr;
446
447 bio = iblock_get_bio(cmd, block_lba, 1);
448 if (!bio)
449 goto fail_free_ibr;
450
451 bio_list_init(&list);
452 bio_list_add(&list, bio);
453
454 atomic_set(&ibr->pending, 1);
455
456 while (sectors) {
457 while (bio_add_page(bio, sg_page(sg), sg->length, sg->offset)
458 != sg->length) {
459
460 bio = iblock_get_bio(cmd, block_lba, 1);
461 if (!bio)
462 goto fail_put_bios;
463
464 atomic_inc(&ibr->pending);
465 bio_list_add(&list, bio);
466 }
467
468 /* Always in 512 byte units for Linux/Block */
469 block_lba += sg->length >> IBLOCK_LBA_SHIFT;
470 sectors -= 1;
471 }
472
473 iblock_submit_bios(&list, WRITE);
474 return 0;
475
476 fail_put_bios:
477 while ((bio = bio_list_pop(&list)))
478 bio_put(bio);
479 fail_free_ibr:
480 kfree(ibr);
481 fail:
482 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
483 }
484
485 enum {
486 Opt_udev_path, Opt_readonly, Opt_force, Opt_err
487 };
488
489 static match_table_t tokens = {
490 {Opt_udev_path, "udev_path=%s"},
491 {Opt_readonly, "readonly=%d"},
492 {Opt_force, "force=%d"},
493 {Opt_err, NULL}
494 };
495
496 static ssize_t iblock_set_configfs_dev_params(struct se_device *dev,
497 const char *page, ssize_t count)
498 {
499 struct iblock_dev *ib_dev = IBLOCK_DEV(dev);
500 char *orig, *ptr, *arg_p, *opts;
501 substring_t args[MAX_OPT_ARGS];
502 int ret = 0, token;
503 unsigned long tmp_readonly;
504
505 opts = kstrdup(page, GFP_KERNEL);
506 if (!opts)
507 return -ENOMEM;
508
509 orig = opts;
510
511 while ((ptr = strsep(&opts, ",\n")) != NULL) {
512 if (!*ptr)
513 continue;
514
515 token = match_token(ptr, tokens, args);
516 switch (token) {
517 case Opt_udev_path:
518 if (ib_dev->ibd_bd) {
519 pr_err("Unable to set udev_path= while"
520 " ib_dev->ibd_bd exists\n");
521 ret = -EEXIST;
522 goto out;
523 }
524 if (match_strlcpy(ib_dev->ibd_udev_path, &args[0],
525 SE_UDEV_PATH_LEN) == 0) {
526 ret = -EINVAL;
527 break;
528 }
529 pr_debug("IBLOCK: Referencing UDEV path: %s\n",
530 ib_dev->ibd_udev_path);
531 ib_dev->ibd_flags |= IBDF_HAS_UDEV_PATH;
532 break;
533 case Opt_readonly:
534 arg_p = match_strdup(&args[0]);
535 if (!arg_p) {
536 ret = -ENOMEM;
537 break;
538 }
539 ret = kstrtoul(arg_p, 0, &tmp_readonly);
540 kfree(arg_p);
541 if (ret < 0) {
542 pr_err("kstrtoul() failed for"
543 " readonly=\n");
544 goto out;
545 }
546 ib_dev->ibd_readonly = tmp_readonly;
547 pr_debug("IBLOCK: readonly: %d\n", ib_dev->ibd_readonly);
548 break;
549 case Opt_force:
550 break;
551 default:
552 break;
553 }
554 }
555
556 out:
557 kfree(orig);
558 return (!ret) ? count : ret;
559 }
560
561 static ssize_t iblock_show_configfs_dev_params(struct se_device *dev, char *b)
562 {
563 struct iblock_dev *ib_dev = IBLOCK_DEV(dev);
564 struct block_device *bd = ib_dev->ibd_bd;
565 char buf[BDEVNAME_SIZE];
566 ssize_t bl = 0;
567
568 if (bd)
569 bl += sprintf(b + bl, "iBlock device: %s",
570 bdevname(bd, buf));
571 if (ib_dev->ibd_flags & IBDF_HAS_UDEV_PATH)
572 bl += sprintf(b + bl, " UDEV PATH: %s",
573 ib_dev->ibd_udev_path);
574 bl += sprintf(b + bl, " readonly: %d\n", ib_dev->ibd_readonly);
575
576 bl += sprintf(b + bl, " ");
577 if (bd) {
578 bl += sprintf(b + bl, "Major: %d Minor: %d %s\n",
579 MAJOR(bd->bd_dev), MINOR(bd->bd_dev), (!bd->bd_contains) ?
580 "" : (bd->bd_holder == ib_dev) ?
581 "CLAIMED: IBLOCK" : "CLAIMED: OS");
582 } else {
583 bl += sprintf(b + bl, "Major: 0 Minor: 0\n");
584 }
585
586 return bl;
587 }
588
589 static int
590 iblock_alloc_bip(struct se_cmd *cmd, struct bio *bio)
591 {
592 struct se_device *dev = cmd->se_dev;
593 struct blk_integrity *bi;
594 struct bio_integrity_payload *bip;
595 struct iblock_dev *ib_dev = IBLOCK_DEV(dev);
596 struct scatterlist *sg;
597 int i, rc;
598
599 bi = bdev_get_integrity(ib_dev->ibd_bd);
600 if (!bi) {
601 pr_err("Unable to locate bio_integrity\n");
602 return -ENODEV;
603 }
604
605 bip = bio_integrity_alloc(bio, GFP_NOIO, cmd->t_prot_nents);
606 if (IS_ERR(bip)) {
607 pr_err("Unable to allocate bio_integrity_payload\n");
608 return PTR_ERR(bip);
609 }
610
611 bip->bip_iter.bi_size = (cmd->data_length / dev->dev_attrib.block_size) *
612 dev->prot_length;
613 bip->bip_iter.bi_sector = bio->bi_iter.bi_sector;
614
615 pr_debug("IBLOCK BIP Size: %u Sector: %llu\n", bip->bip_iter.bi_size,
616 (unsigned long long)bip->bip_iter.bi_sector);
617
618 for_each_sg(cmd->t_prot_sg, sg, cmd->t_prot_nents, i) {
619
620 rc = bio_integrity_add_page(bio, sg_page(sg), sg->length,
621 sg->offset);
622 if (rc != sg->length) {
623 pr_err("bio_integrity_add_page() failed; %d\n", rc);
624 return -ENOMEM;
625 }
626
627 pr_debug("Added bio integrity page: %p length: %d offset; %d\n",
628 sg_page(sg), sg->length, sg->offset);
629 }
630
631 return 0;
632 }
633
634 static sense_reason_t
635 iblock_execute_rw(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents,
636 enum dma_data_direction data_direction)
637 {
638 struct se_device *dev = cmd->se_dev;
639 sector_t block_lba = target_to_linux_sector(dev, cmd->t_task_lba);
640 struct iblock_req *ibr;
641 struct bio *bio, *bio_start;
642 struct bio_list list;
643 struct scatterlist *sg;
644 u32 sg_num = sgl_nents;
645 unsigned bio_cnt;
646 int rw = 0;
647 int i;
648
649 if (data_direction == DMA_TO_DEVICE) {
650 struct iblock_dev *ib_dev = IBLOCK_DEV(dev);
651 struct request_queue *q = bdev_get_queue(ib_dev->ibd_bd);
652 /*
653 * Force writethrough using WRITE_FUA if a volatile write cache
654 * is not enabled, or if initiator set the Force Unit Access bit.
655 */
656 if (q->flush_flags & REQ_FUA) {
657 if (cmd->se_cmd_flags & SCF_FUA)
658 rw = WRITE_FUA;
659 else if (!(q->flush_flags & REQ_FLUSH))
660 rw = WRITE_FUA;
661 else
662 rw = WRITE;
663 } else {
664 rw = WRITE;
665 }
666 } else {
667 rw = READ;
668 }
669
670 ibr = kzalloc(sizeof(struct iblock_req), GFP_KERNEL);
671 if (!ibr)
672 goto fail;
673 cmd->priv = ibr;
674
675 if (!sgl_nents) {
676 atomic_set(&ibr->pending, 1);
677 iblock_complete_cmd(cmd);
678 return 0;
679 }
680
681 bio = iblock_get_bio(cmd, block_lba, sgl_nents);
682 if (!bio)
683 goto fail_free_ibr;
684
685 bio_start = bio;
686 bio_list_init(&list);
687 bio_list_add(&list, bio);
688
689 atomic_set(&ibr->pending, 2);
690 bio_cnt = 1;
691
692 for_each_sg(sgl, sg, sgl_nents, i) {
693 /*
694 * XXX: if the length the device accepts is shorter than the
695 * length of the S/G list entry this will cause and
696 * endless loop. Better hope no driver uses huge pages.
697 */
698 while (bio_add_page(bio, sg_page(sg), sg->length, sg->offset)
699 != sg->length) {
700 if (bio_cnt >= IBLOCK_MAX_BIO_PER_TASK) {
701 iblock_submit_bios(&list, rw);
702 bio_cnt = 0;
703 }
704
705 bio = iblock_get_bio(cmd, block_lba, sg_num);
706 if (!bio)
707 goto fail_put_bios;
708
709 atomic_inc(&ibr->pending);
710 bio_list_add(&list, bio);
711 bio_cnt++;
712 }
713
714 /* Always in 512 byte units for Linux/Block */
715 block_lba += sg->length >> IBLOCK_LBA_SHIFT;
716 sg_num--;
717 }
718
719 if (cmd->prot_type && dev->dev_attrib.pi_prot_type) {
720 int rc = iblock_alloc_bip(cmd, bio_start);
721 if (rc)
722 goto fail_put_bios;
723 }
724
725 iblock_submit_bios(&list, rw);
726 iblock_complete_cmd(cmd);
727 return 0;
728
729 fail_put_bios:
730 while ((bio = bio_list_pop(&list)))
731 bio_put(bio);
732 fail_free_ibr:
733 kfree(ibr);
734 fail:
735 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
736 }
737
738 static sector_t iblock_get_blocks(struct se_device *dev)
739 {
740 struct iblock_dev *ib_dev = IBLOCK_DEV(dev);
741 struct block_device *bd = ib_dev->ibd_bd;
742 struct request_queue *q = bdev_get_queue(bd);
743
744 return iblock_emulate_read_cap_with_block_size(dev, bd, q);
745 }
746
747 static sector_t iblock_get_alignment_offset_lbas(struct se_device *dev)
748 {
749 struct iblock_dev *ib_dev = IBLOCK_DEV(dev);
750 struct block_device *bd = ib_dev->ibd_bd;
751 int ret;
752
753 ret = bdev_alignment_offset(bd);
754 if (ret == -1)
755 return 0;
756
757 /* convert offset-bytes to offset-lbas */
758 return ret / bdev_logical_block_size(bd);
759 }
760
761 static unsigned int iblock_get_lbppbe(struct se_device *dev)
762 {
763 struct iblock_dev *ib_dev = IBLOCK_DEV(dev);
764 struct block_device *bd = ib_dev->ibd_bd;
765 int logs_per_phys = bdev_physical_block_size(bd) / bdev_logical_block_size(bd);
766
767 return ilog2(logs_per_phys);
768 }
769
770 static unsigned int iblock_get_io_min(struct se_device *dev)
771 {
772 struct iblock_dev *ib_dev = IBLOCK_DEV(dev);
773 struct block_device *bd = ib_dev->ibd_bd;
774
775 return bdev_io_min(bd);
776 }
777
778 static unsigned int iblock_get_io_opt(struct se_device *dev)
779 {
780 struct iblock_dev *ib_dev = IBLOCK_DEV(dev);
781 struct block_device *bd = ib_dev->ibd_bd;
782
783 return bdev_io_opt(bd);
784 }
785
786 static struct sbc_ops iblock_sbc_ops = {
787 .execute_rw = iblock_execute_rw,
788 .execute_sync_cache = iblock_execute_sync_cache,
789 .execute_write_same = iblock_execute_write_same,
790 .execute_unmap = iblock_execute_unmap,
791 };
792
793 static sense_reason_t
794 iblock_parse_cdb(struct se_cmd *cmd)
795 {
796 return sbc_parse_cdb(cmd, &iblock_sbc_ops);
797 }
798
799 static bool iblock_get_write_cache(struct se_device *dev)
800 {
801 struct iblock_dev *ib_dev = IBLOCK_DEV(dev);
802 struct block_device *bd = ib_dev->ibd_bd;
803 struct request_queue *q = bdev_get_queue(bd);
804
805 return q->flush_flags & REQ_FLUSH;
806 }
807
808 static const struct target_backend_ops iblock_ops = {
809 .name = "iblock",
810 .inquiry_prod = "IBLOCK",
811 .inquiry_rev = IBLOCK_VERSION,
812 .owner = THIS_MODULE,
813 .attach_hba = iblock_attach_hba,
814 .detach_hba = iblock_detach_hba,
815 .alloc_device = iblock_alloc_device,
816 .configure_device = iblock_configure_device,
817 .free_device = iblock_free_device,
818 .parse_cdb = iblock_parse_cdb,
819 .set_configfs_dev_params = iblock_set_configfs_dev_params,
820 .show_configfs_dev_params = iblock_show_configfs_dev_params,
821 .get_device_type = sbc_get_device_type,
822 .get_blocks = iblock_get_blocks,
823 .get_alignment_offset_lbas = iblock_get_alignment_offset_lbas,
824 .get_lbppbe = iblock_get_lbppbe,
825 .get_io_min = iblock_get_io_min,
826 .get_io_opt = iblock_get_io_opt,
827 .get_write_cache = iblock_get_write_cache,
828 .tb_dev_attrib_attrs = sbc_attrib_attrs,
829 };
830
831 static int __init iblock_module_init(void)
832 {
833 return transport_backend_register(&iblock_ops);
834 }
835
836 static void __exit iblock_module_exit(void)
837 {
838 target_backend_unregister(&iblock_ops);
839 }
840
841 MODULE_DESCRIPTION("TCM IBLOCK subsystem plugin");
842 MODULE_AUTHOR("nab@Linux-iSCSI.org");
843 MODULE_LICENSE("GPL");
844
845 module_init(iblock_module_init);
846 module_exit(iblock_module_exit);
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