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gro: Allow tunnel stacking in the case of FOU/GUE
[linux/fpc-iii.git] / drivers / target / target_core_iblock.c
blob8c965683789f9e141233edac76593e156a58bd2f
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.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 /* max # of bios to submit at a time */
49 #define IBLOCK_BIO_POOL_SIZE 128
50
51 static inline struct iblock_dev *IBLOCK_DEV(struct se_device *dev)
52 {
53 return container_of(dev, struct iblock_dev, dev);
54 }
55
56
57 static struct se_subsystem_api iblock_template;
58
59 /* iblock_attach_hba(): (Part of se_subsystem_api_t template)
60 *
61 *
62 */
63 static 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
71 static void iblock_detach_hba(struct se_hba *hba)
72 {
73 }
74
75 static 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
90 static 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 * Check if the underlying struct block_device request_queue supports
132 * the QUEUE_FLAG_DISCARD bit for UNMAP/WRITE_SAME in SCSI + TRIM
133 * in ATA and we need to set TPE=1
134 */
135 if (blk_queue_discard(q)) {
136 dev->dev_attrib.max_unmap_lba_count =
137 q->limits.max_discard_sectors;
138
139 /*
140 * Currently hardcoded to 1 in Linux/SCSI code..
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 * Enable write same emulation for IBLOCK and use 0xFFFF as
153 * the smaller WRITE_SAME(10) only has a two-byte block count.
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
192 out_blkdev_put:
193 blkdev_put(ib_dev->ibd_bd, FMODE_WRITE|FMODE_READ|FMODE_EXCL);
194 out_free_bioset:
195 bioset_free(ib_dev->ibd_bio_set);
196 ib_dev->ibd_bio_set = NULL;
197 out:
198 return ret;
199 }
200
201 static 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
213 static 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
292 static 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
309 static 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 * Set -EIO if !BIO_UPTODATE and the passed is still err=0
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 * Bump the ib_bio_err_cnt and release bio.
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
335 static struct bio *
336 iblock_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 * Only allocate as many vector entries as the bio code allows us to,
343 * we'll loop later on until we have handled the whole request.
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
362 static 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
373 static 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 * Implement SYCHRONIZE CACHE. Note that we can't handle lba ranges and must
392 * always flush the whole cache.
393 */
394 static sense_reason_t
395 iblock_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 * If the Immediate bit is set, queue up the GOOD response
403 * for this SYNCHRONIZE_CACHE op.
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
417 static sense_reason_t
418 iblock_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
433 static sense_reason_t
434 iblock_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
441 static sense_reason_t
442 iblock_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 sense_reason_t 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
457 static sense_reason_t
458 iblock_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 if (cmd->prot_op) {
468 pr_err("WRITE_SAME: Protection information with IBLOCK"
469 " backends not supported\n");
470 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
471 }
472 sg = &cmd->t_data_sg[0];
473
474 if (cmd->t_data_nents > 1 ||
475 sg->length != cmd->se_dev->dev_attrib.block_size) {
476 pr_err("WRITE_SAME: Illegal SGL t_data_nents: %u length: %u"
477 " block_size: %u\n", cmd->t_data_nents, sg->length,
478 cmd->se_dev->dev_attrib.block_size);
479 return TCM_INVALID_CDB_FIELD;
480 }
481
482 ibr = kzalloc(sizeof(struct iblock_req), GFP_KERNEL);
483 if (!ibr)
484 goto fail;
485 cmd->priv = ibr;
486
487 bio = iblock_get_bio(cmd, block_lba, 1);
488 if (!bio)
489 goto fail_free_ibr;
490
491 bio_list_init(&list);
492 bio_list_add(&list, bio);
493
494 atomic_set(&ibr->pending, 1);
495
496 while (sectors) {
497 while (bio_add_page(bio, sg_page(sg), sg->length, sg->offset)
498 != sg->length) {
499
500 bio = iblock_get_bio(cmd, block_lba, 1);
501 if (!bio)
502 goto fail_put_bios;
503
504 atomic_inc(&ibr->pending);
505 bio_list_add(&list, bio);
506 }
507
508 /* Always in 512 byte units for Linux/Block */
509 block_lba += sg->length >> IBLOCK_LBA_SHIFT;
510 sectors -= 1;
511 }
512
513 iblock_submit_bios(&list, WRITE);
514 return 0;
515
516 fail_put_bios:
517 while ((bio = bio_list_pop(&list)))
518 bio_put(bio);
519 fail_free_ibr:
520 kfree(ibr);
521 fail:
522 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
523 }
524
525 enum {
526 Opt_udev_path, Opt_readonly, Opt_force, Opt_err
527 };
528
529 static match_table_t tokens = {
530 {Opt_udev_path, "udev_path=%s"},
531 {Opt_readonly, "readonly=%d"},
532 {Opt_force, "force=%d"},
533 {Opt_err, NULL}
534 };
535
536 static ssize_t iblock_set_configfs_dev_params(struct se_device *dev,
537 const char *page, ssize_t count)
538 {
539 struct iblock_dev *ib_dev = IBLOCK_DEV(dev);
540 char *orig, *ptr, *arg_p, *opts;
541 substring_t args[MAX_OPT_ARGS];
542 int ret = 0, token;
543 unsigned long tmp_readonly;
544
545 opts = kstrdup(page, GFP_KERNEL);
546 if (!opts)
547 return -ENOMEM;
548
549 orig = opts;
550
551 while ((ptr = strsep(&opts, ",\n")) != NULL) {
552 if (!*ptr)
553 continue;
554
555 token = match_token(ptr, tokens, args);
556 switch (token) {
557 case Opt_udev_path:
558 if (ib_dev->ibd_bd) {
559 pr_err("Unable to set udev_path= while"
560 " ib_dev->ibd_bd exists\n");
561 ret = -EEXIST;
562 goto out;
563 }
564 if (match_strlcpy(ib_dev->ibd_udev_path, &args[0],
565 SE_UDEV_PATH_LEN) == 0) {
566 ret = -EINVAL;
567 break;
568 }
569 pr_debug("IBLOCK: Referencing UDEV path: %s\n",
570 ib_dev->ibd_udev_path);
571 ib_dev->ibd_flags |= IBDF_HAS_UDEV_PATH;
572 break;
573 case Opt_readonly:
574 arg_p = match_strdup(&args[0]);
575 if (!arg_p) {
576 ret = -ENOMEM;
577 break;
578 }
579 ret = kstrtoul(arg_p, 0, &tmp_readonly);
580 kfree(arg_p);
581 if (ret < 0) {
582 pr_err("kstrtoul() failed for"
583 " readonly=\n");
584 goto out;
585 }
586 ib_dev->ibd_readonly = tmp_readonly;
587 pr_debug("IBLOCK: readonly: %d\n", ib_dev->ibd_readonly);
588 break;
589 case Opt_force:
590 break;
591 default:
592 break;
593 }
594 }
595
596 out:
597 kfree(orig);
598 return (!ret) ? count : ret;
599 }
600
601 static ssize_t iblock_show_configfs_dev_params(struct se_device *dev, char *b)
602 {
603 struct iblock_dev *ib_dev = IBLOCK_DEV(dev);
604 struct block_device *bd = ib_dev->ibd_bd;
605 char buf[BDEVNAME_SIZE];
606 ssize_t bl = 0;
607
608 if (bd)
609 bl += sprintf(b + bl, "iBlock device: %s",
610 bdevname(bd, buf));
611 if (ib_dev->ibd_flags & IBDF_HAS_UDEV_PATH)
612 bl += sprintf(b + bl, " UDEV PATH: %s",
613 ib_dev->ibd_udev_path);
614 bl += sprintf(b + bl, " readonly: %d\n", ib_dev->ibd_readonly);
615
616 bl += sprintf(b + bl, " ");
617 if (bd) {
618 bl += sprintf(b + bl, "Major: %d Minor: %d %s\n",
619 MAJOR(bd->bd_dev), MINOR(bd->bd_dev), (!bd->bd_contains) ?
620 "" : (bd->bd_holder == ib_dev) ?
621 "CLAIMED: IBLOCK" : "CLAIMED: OS");
622 } else {
623 bl += sprintf(b + bl, "Major: 0 Minor: 0\n");
624 }
625
626 return bl;
627 }
628
629 static int
630 iblock_alloc_bip(struct se_cmd *cmd, struct bio *bio)
631 {
632 struct se_device *dev = cmd->se_dev;
633 struct blk_integrity *bi;
634 struct bio_integrity_payload *bip;
635 struct iblock_dev *ib_dev = IBLOCK_DEV(dev);
636 struct scatterlist *sg;
637 int i, rc;
638
639 bi = bdev_get_integrity(ib_dev->ibd_bd);
640 if (!bi) {
641 pr_err("Unable to locate bio_integrity\n");
642 return -ENODEV;
643 }
644
645 bip = bio_integrity_alloc(bio, GFP_NOIO, cmd->t_prot_nents);
646 if (!bip) {
647 pr_err("Unable to allocate bio_integrity_payload\n");
648 return -ENOMEM;
649 }
650
651 bip->bip_iter.bi_size = (cmd->data_length / dev->dev_attrib.block_size) *
652 dev->prot_length;
653 bip->bip_iter.bi_sector = bio->bi_iter.bi_sector;
654
655 pr_debug("IBLOCK BIP Size: %u Sector: %llu\n", bip->bip_iter.bi_size,
656 (unsigned long long)bip->bip_iter.bi_sector);
657
658 for_each_sg(cmd->t_prot_sg, sg, cmd->t_prot_nents, i) {
659
660 rc = bio_integrity_add_page(bio, sg_page(sg), sg->length,
661 sg->offset);
662 if (rc != sg->length) {
663 pr_err("bio_integrity_add_page() failed; %d\n", rc);
664 return -ENOMEM;
665 }
666
667 pr_debug("Added bio integrity page: %p length: %d offset; %d\n",
668 sg_page(sg), sg->length, sg->offset);
669 }
670
671 return 0;
672 }
673
674 static sense_reason_t
675 iblock_execute_rw(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents,
676 enum dma_data_direction data_direction)
677 {
678 struct se_device *dev = cmd->se_dev;
679 struct iblock_req *ibr;
680 struct bio *bio, *bio_start;
681 struct bio_list list;
682 struct scatterlist *sg;
683 u32 sg_num = sgl_nents;
684 sector_t block_lba;
685 unsigned bio_cnt;
686 int rw = 0;
687 int i;
688
689 if (data_direction == DMA_TO_DEVICE) {
690 struct iblock_dev *ib_dev = IBLOCK_DEV(dev);
691 struct request_queue *q = bdev_get_queue(ib_dev->ibd_bd);
692 /*
693 * Force writethrough using WRITE_FUA if a volatile write cache
694 * is not enabled, or if initiator set the Force Unit Access bit.
695 */
696 if (q->flush_flags & REQ_FUA) {
697 if (cmd->se_cmd_flags & SCF_FUA)
698 rw = WRITE_FUA;
699 else if (!(q->flush_flags & REQ_FLUSH))
700 rw = WRITE_FUA;
701 else
702 rw = WRITE;
703 } else {
704 rw = WRITE;
705 }
706 } else {
707 rw = READ;
708 }
709
710 /*
711 * Convert the blocksize advertised to the initiator to the 512 byte
712 * units unconditionally used by the Linux block layer.
713 */
714 if (dev->dev_attrib.block_size == 4096)
715 block_lba = (cmd->t_task_lba << 3);
716 else if (dev->dev_attrib.block_size == 2048)
717 block_lba = (cmd->t_task_lba << 2);
718 else if (dev->dev_attrib.block_size == 1024)
719 block_lba = (cmd->t_task_lba << 1);
720 else if (dev->dev_attrib.block_size == 512)
721 block_lba = cmd->t_task_lba;
722 else {
723 pr_err("Unsupported SCSI -> BLOCK LBA conversion:"
724 " %u\n", dev->dev_attrib.block_size);
725 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
726 }
727
728 ibr = kzalloc(sizeof(struct iblock_req), GFP_KERNEL);
729 if (!ibr)
730 goto fail;
731 cmd->priv = ibr;
732
733 if (!sgl_nents) {
734 atomic_set(&ibr->pending, 1);
735 iblock_complete_cmd(cmd);
736 return 0;
737 }
738
739 bio = iblock_get_bio(cmd, block_lba, sgl_nents);
740 if (!bio)
741 goto fail_free_ibr;
742
743 bio_start = bio;
744 bio_list_init(&list);
745 bio_list_add(&list, bio);
746
747 atomic_set(&ibr->pending, 2);
748 bio_cnt = 1;
749
750 for_each_sg(sgl, sg, sgl_nents, i) {
751 /*
752 * XXX: if the length the device accepts is shorter than the
753 * length of the S/G list entry this will cause and
754 * endless loop. Better hope no driver uses huge pages.
755 */
756 while (bio_add_page(bio, sg_page(sg), sg->length, sg->offset)
757 != sg->length) {
758 if (bio_cnt >= IBLOCK_MAX_BIO_PER_TASK) {
759 iblock_submit_bios(&list, rw);
760 bio_cnt = 0;
761 }
762
763 bio = iblock_get_bio(cmd, block_lba, sg_num);
764 if (!bio)
765 goto fail_put_bios;
766
767 atomic_inc(&ibr->pending);
768 bio_list_add(&list, bio);
769 bio_cnt++;
770 }
771
772 /* Always in 512 byte units for Linux/Block */
773 block_lba += sg->length >> IBLOCK_LBA_SHIFT;
774 sg_num--;
775 }
776
777 if (cmd->prot_type && dev->dev_attrib.pi_prot_type) {
778 int rc = iblock_alloc_bip(cmd, bio_start);
779 if (rc)
780 goto fail_put_bios;
781 }
782
783 iblock_submit_bios(&list, rw);
784 iblock_complete_cmd(cmd);
785 return 0;
786
787 fail_put_bios:
788 while ((bio = bio_list_pop(&list)))
789 bio_put(bio);
790 fail_free_ibr:
791 kfree(ibr);
792 fail:
793 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
794 }
795
796 static sector_t iblock_get_blocks(struct se_device *dev)
797 {
798 struct iblock_dev *ib_dev = IBLOCK_DEV(dev);
799 struct block_device *bd = ib_dev->ibd_bd;
800 struct request_queue *q = bdev_get_queue(bd);
801
802 return iblock_emulate_read_cap_with_block_size(dev, bd, q);
803 }
804
805 static sector_t iblock_get_alignment_offset_lbas(struct se_device *dev)
806 {
807 struct iblock_dev *ib_dev = IBLOCK_DEV(dev);
808 struct block_device *bd = ib_dev->ibd_bd;
809 int ret;
810
811 ret = bdev_alignment_offset(bd);
812 if (ret == -1)
813 return 0;
814
815 /* convert offset-bytes to offset-lbas */
816 return ret / bdev_logical_block_size(bd);
817 }
818
819 static unsigned int iblock_get_lbppbe(struct se_device *dev)
820 {
821 struct iblock_dev *ib_dev = IBLOCK_DEV(dev);
822 struct block_device *bd = ib_dev->ibd_bd;
823 int logs_per_phys = bdev_physical_block_size(bd) / bdev_logical_block_size(bd);
824
825 return ilog2(logs_per_phys);
826 }
827
828 static unsigned int iblock_get_io_min(struct se_device *dev)
829 {
830 struct iblock_dev *ib_dev = IBLOCK_DEV(dev);
831 struct block_device *bd = ib_dev->ibd_bd;
832
833 return bdev_io_min(bd);
834 }
835
836 static unsigned int iblock_get_io_opt(struct se_device *dev)
837 {
838 struct iblock_dev *ib_dev = IBLOCK_DEV(dev);
839 struct block_device *bd = ib_dev->ibd_bd;
840
841 return bdev_io_opt(bd);
842 }
843
844 static struct sbc_ops iblock_sbc_ops = {
845 .execute_rw = iblock_execute_rw,
846 .execute_sync_cache = iblock_execute_sync_cache,
847 .execute_write_same = iblock_execute_write_same,
848 .execute_write_same_unmap = iblock_execute_write_same_unmap,
849 .execute_unmap = iblock_execute_unmap,
850 };
851
852 static sense_reason_t
853 iblock_parse_cdb(struct se_cmd *cmd)
854 {
855 return sbc_parse_cdb(cmd, &iblock_sbc_ops);
856 }
857
858 static bool iblock_get_write_cache(struct se_device *dev)
859 {
860 struct iblock_dev *ib_dev = IBLOCK_DEV(dev);
861 struct block_device *bd = ib_dev->ibd_bd;
862 struct request_queue *q = bdev_get_queue(bd);
863
864 return q->flush_flags & REQ_FLUSH;
865 }
866
867 DEF_TB_DEFAULT_ATTRIBS(iblock);
868
869 static struct configfs_attribute *iblock_backend_dev_attrs[] = {
870 &iblock_dev_attrib_emulate_model_alias.attr,
871 &iblock_dev_attrib_emulate_dpo.attr,
872 &iblock_dev_attrib_emulate_fua_write.attr,
873 &iblock_dev_attrib_emulate_fua_read.attr,
874 &iblock_dev_attrib_emulate_write_cache.attr,
875 &iblock_dev_attrib_emulate_ua_intlck_ctrl.attr,
876 &iblock_dev_attrib_emulate_tas.attr,
877 &iblock_dev_attrib_emulate_tpu.attr,
878 &iblock_dev_attrib_emulate_tpws.attr,
879 &iblock_dev_attrib_emulate_caw.attr,
880 &iblock_dev_attrib_emulate_3pc.attr,
881 &iblock_dev_attrib_pi_prot_type.attr,
882 &iblock_dev_attrib_hw_pi_prot_type.attr,
883 &iblock_dev_attrib_pi_prot_format.attr,
884 &iblock_dev_attrib_enforce_pr_isids.attr,
885 &iblock_dev_attrib_is_nonrot.attr,
886 &iblock_dev_attrib_emulate_rest_reord.attr,
887 &iblock_dev_attrib_force_pr_aptpl.attr,
888 &iblock_dev_attrib_hw_block_size.attr,
889 &iblock_dev_attrib_block_size.attr,
890 &iblock_dev_attrib_hw_max_sectors.attr,
891 &iblock_dev_attrib_optimal_sectors.attr,
892 &iblock_dev_attrib_hw_queue_depth.attr,
893 &iblock_dev_attrib_queue_depth.attr,
894 &iblock_dev_attrib_max_unmap_lba_count.attr,
895 &iblock_dev_attrib_max_unmap_block_desc_count.attr,
896 &iblock_dev_attrib_unmap_granularity.attr,
897 &iblock_dev_attrib_unmap_granularity_alignment.attr,
898 &iblock_dev_attrib_max_write_same_len.attr,
899 NULL,
900 };
901
902 static struct se_subsystem_api iblock_template = {
903 .name = "iblock",
904 .inquiry_prod = "IBLOCK",
905 .inquiry_rev = IBLOCK_VERSION,
906 .owner = THIS_MODULE,
907 .attach_hba = iblock_attach_hba,
908 .detach_hba = iblock_detach_hba,
909 .alloc_device = iblock_alloc_device,
910 .configure_device = iblock_configure_device,
911 .free_device = iblock_free_device,
912 .parse_cdb = iblock_parse_cdb,
913 .set_configfs_dev_params = iblock_set_configfs_dev_params,
914 .show_configfs_dev_params = iblock_show_configfs_dev_params,
915 .get_device_type = sbc_get_device_type,
916 .get_blocks = iblock_get_blocks,
917 .get_alignment_offset_lbas = iblock_get_alignment_offset_lbas,
918 .get_lbppbe = iblock_get_lbppbe,
919 .get_io_min = iblock_get_io_min,
920 .get_io_opt = iblock_get_io_opt,
921 .get_write_cache = iblock_get_write_cache,
922 };
923
924 static int __init iblock_module_init(void)
925 {
926 struct target_backend_cits *tbc = &iblock_template.tb_cits;
927
928 target_core_setup_sub_cits(&iblock_template);
929 tbc->tb_dev_attrib_cit.ct_attrs = iblock_backend_dev_attrs;
930
931 return transport_subsystem_register(&iblock_template);
932 }
933
934 static void __exit iblock_module_exit(void)
935 {
936 transport_subsystem_release(&iblock_template);
937 }
938
939 MODULE_DESCRIPTION("TCM IBLOCK subsystem plugin");
940 MODULE_AUTHOR("nab@Linux-iSCSI.org");
941 MODULE_LICENSE("GPL");
942
943 module_init(iblock_module_init);
944 module_exit(iblock_module_exit);
Linux with added FPC-III support