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block/fs/drivers: remove rw argument from submit_bio
[mirror_ubuntu-hirsute-kernel.git] / drivers / target / target_core_iblock.c
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, int rw)
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 bio->bi_rw = rw;
338
339 return bio;
340 }
341
342 static void iblock_submit_bios(struct bio_list *list)
343 {
344 struct blk_plug plug;
345 struct bio *bio;
346
347 blk_start_plug(&plug);
348 while ((bio = bio_list_pop(list)))
349 submit_bio(bio);
350 blk_finish_plug(&plug);
351 }
352
353 static void iblock_end_io_flush(struct bio *bio)
354 {
355 struct se_cmd *cmd = bio->bi_private;
356
357 if (bio->bi_error)
358 pr_err("IBLOCK: cache flush failed: %d\n", bio->bi_error);
359
360 if (cmd) {
361 if (bio->bi_error)
362 target_complete_cmd(cmd, SAM_STAT_CHECK_CONDITION);
363 else
364 target_complete_cmd(cmd, SAM_STAT_GOOD);
365 }
366
367 bio_put(bio);
368 }
369
370 /*
371 * Implement SYCHRONIZE CACHE. Note that we can't handle lba ranges and must
372 * always flush the whole cache.
373 */
374 static sense_reason_t
375 iblock_execute_sync_cache(struct se_cmd *cmd)
376 {
377 struct iblock_dev *ib_dev = IBLOCK_DEV(cmd->se_dev);
378 int immed = (cmd->t_task_cdb[1] & 0x2);
379 struct bio *bio;
380
381 /*
382 * If the Immediate bit is set, queue up the GOOD response
383 * for this SYNCHRONIZE_CACHE op.
384 */
385 if (immed)
386 target_complete_cmd(cmd, SAM_STAT_GOOD);
387
388 bio = bio_alloc(GFP_KERNEL, 0);
389 bio->bi_end_io = iblock_end_io_flush;
390 bio->bi_bdev = ib_dev->ibd_bd;
391 bio->bi_rw = WRITE_FLUSH;
392 if (!immed)
393 bio->bi_private = cmd;
394 submit_bio(bio);
395 return 0;
396 }
397
398 static sense_reason_t
399 iblock_execute_unmap(struct se_cmd *cmd, sector_t lba, sector_t nolb)
400 {
401 struct block_device *bdev = IBLOCK_DEV(cmd->se_dev)->ibd_bd;
402 struct se_device *dev = cmd->se_dev;
403 int ret;
404
405 ret = blkdev_issue_discard(bdev,
406 target_to_linux_sector(dev, lba),
407 target_to_linux_sector(dev, nolb),
408 GFP_KERNEL, 0);
409 if (ret < 0) {
410 pr_err("blkdev_issue_discard() failed: %d\n", ret);
411 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
412 }
413
414 return 0;
415 }
416
417 static sense_reason_t
418 iblock_execute_write_same_direct(struct block_device *bdev, struct se_cmd *cmd)
419 {
420 struct se_device *dev = cmd->se_dev;
421 struct scatterlist *sg = &cmd->t_data_sg[0];
422 struct page *page = NULL;
423 int ret;
424
425 if (sg->offset) {
426 page = alloc_page(GFP_KERNEL);
427 if (!page)
428 return TCM_OUT_OF_RESOURCES;
429 sg_copy_to_buffer(sg, cmd->t_data_nents, page_address(page),
430 dev->dev_attrib.block_size);
431 }
432
433 ret = blkdev_issue_write_same(bdev,
434 target_to_linux_sector(dev, cmd->t_task_lba),
435 target_to_linux_sector(dev,
436 sbc_get_write_same_sectors(cmd)),
437 GFP_KERNEL, page ? page : sg_page(sg));
438 if (page)
439 __free_page(page);
440 if (ret)
441 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
442
443 target_complete_cmd(cmd, GOOD);
444 return 0;
445 }
446
447 static sense_reason_t
448 iblock_execute_write_same(struct se_cmd *cmd)
449 {
450 struct block_device *bdev = IBLOCK_DEV(cmd->se_dev)->ibd_bd;
451 struct iblock_req *ibr;
452 struct scatterlist *sg;
453 struct bio *bio;
454 struct bio_list list;
455 struct se_device *dev = cmd->se_dev;
456 sector_t block_lba = target_to_linux_sector(dev, cmd->t_task_lba);
457 sector_t sectors = target_to_linux_sector(dev,
458 sbc_get_write_same_sectors(cmd));
459
460 if (cmd->prot_op) {
461 pr_err("WRITE_SAME: Protection information with IBLOCK"
462 " backends not supported\n");
463 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
464 }
465 sg = &cmd->t_data_sg[0];
466
467 if (cmd->t_data_nents > 1 ||
468 sg->length != cmd->se_dev->dev_attrib.block_size) {
469 pr_err("WRITE_SAME: Illegal SGL t_data_nents: %u length: %u"
470 " block_size: %u\n", cmd->t_data_nents, sg->length,
471 cmd->se_dev->dev_attrib.block_size);
472 return TCM_INVALID_CDB_FIELD;
473 }
474
475 if (bdev_write_same(bdev))
476 return iblock_execute_write_same_direct(bdev, cmd);
477
478 ibr = kzalloc(sizeof(struct iblock_req), GFP_KERNEL);
479 if (!ibr)
480 goto fail;
481 cmd->priv = ibr;
482
483 bio = iblock_get_bio(cmd, block_lba, 1, WRITE);
484 if (!bio)
485 goto fail_free_ibr;
486
487 bio_list_init(&list);
488 bio_list_add(&list, bio);
489
490 atomic_set(&ibr->pending, 1);
491
492 while (sectors) {
493 while (bio_add_page(bio, sg_page(sg), sg->length, sg->offset)
494 != sg->length) {
495
496 bio = iblock_get_bio(cmd, block_lba, 1, WRITE);
497 if (!bio)
498 goto fail_put_bios;
499
500 atomic_inc(&ibr->pending);
501 bio_list_add(&list, bio);
502 }
503
504 /* Always in 512 byte units for Linux/Block */
505 block_lba += sg->length >> IBLOCK_LBA_SHIFT;
506 sectors -= 1;
507 }
508
509 iblock_submit_bios(&list);
510 return 0;
511
512 fail_put_bios:
513 while ((bio = bio_list_pop(&list)))
514 bio_put(bio);
515 fail_free_ibr:
516 kfree(ibr);
517 fail:
518 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
519 }
520
521 enum {
522 Opt_udev_path, Opt_readonly, Opt_force, Opt_err
523 };
524
525 static match_table_t tokens = {
526 {Opt_udev_path, "udev_path=%s"},
527 {Opt_readonly, "readonly=%d"},
528 {Opt_force, "force=%d"},
529 {Opt_err, NULL}
530 };
531
532 static ssize_t iblock_set_configfs_dev_params(struct se_device *dev,
533 const char *page, ssize_t count)
534 {
535 struct iblock_dev *ib_dev = IBLOCK_DEV(dev);
536 char *orig, *ptr, *arg_p, *opts;
537 substring_t args[MAX_OPT_ARGS];
538 int ret = 0, token;
539 unsigned long tmp_readonly;
540
541 opts = kstrdup(page, GFP_KERNEL);
542 if (!opts)
543 return -ENOMEM;
544
545 orig = opts;
546
547 while ((ptr = strsep(&opts, ",\n")) != NULL) {
548 if (!*ptr)
549 continue;
550
551 token = match_token(ptr, tokens, args);
552 switch (token) {
553 case Opt_udev_path:
554 if (ib_dev->ibd_bd) {
555 pr_err("Unable to set udev_path= while"
556 " ib_dev->ibd_bd exists\n");
557 ret = -EEXIST;
558 goto out;
559 }
560 if (match_strlcpy(ib_dev->ibd_udev_path, &args[0],
561 SE_UDEV_PATH_LEN) == 0) {
562 ret = -EINVAL;
563 break;
564 }
565 pr_debug("IBLOCK: Referencing UDEV path: %s\n",
566 ib_dev->ibd_udev_path);
567 ib_dev->ibd_flags |= IBDF_HAS_UDEV_PATH;
568 break;
569 case Opt_readonly:
570 arg_p = match_strdup(&args[0]);
571 if (!arg_p) {
572 ret = -ENOMEM;
573 break;
574 }
575 ret = kstrtoul(arg_p, 0, &tmp_readonly);
576 kfree(arg_p);
577 if (ret < 0) {
578 pr_err("kstrtoul() failed for"
579 " readonly=\n");
580 goto out;
581 }
582 ib_dev->ibd_readonly = tmp_readonly;
583 pr_debug("IBLOCK: readonly: %d\n", ib_dev->ibd_readonly);
584 break;
585 case Opt_force:
586 break;
587 default:
588 break;
589 }
590 }
591
592 out:
593 kfree(orig);
594 return (!ret) ? count : ret;
595 }
596
597 static ssize_t iblock_show_configfs_dev_params(struct se_device *dev, char *b)
598 {
599 struct iblock_dev *ib_dev = IBLOCK_DEV(dev);
600 struct block_device *bd = ib_dev->ibd_bd;
601 char buf[BDEVNAME_SIZE];
602 ssize_t bl = 0;
603
604 if (bd)
605 bl += sprintf(b + bl, "iBlock device: %s",
606 bdevname(bd, buf));
607 if (ib_dev->ibd_flags & IBDF_HAS_UDEV_PATH)
608 bl += sprintf(b + bl, " UDEV PATH: %s",
609 ib_dev->ibd_udev_path);
610 bl += sprintf(b + bl, " readonly: %d\n", ib_dev->ibd_readonly);
611
612 bl += sprintf(b + bl, " ");
613 if (bd) {
614 bl += sprintf(b + bl, "Major: %d Minor: %d %s\n",
615 MAJOR(bd->bd_dev), MINOR(bd->bd_dev), (!bd->bd_contains) ?
616 "" : (bd->bd_holder == ib_dev) ?
617 "CLAIMED: IBLOCK" : "CLAIMED: OS");
618 } else {
619 bl += sprintf(b + bl, "Major: 0 Minor: 0\n");
620 }
621
622 return bl;
623 }
624
625 static int
626 iblock_alloc_bip(struct se_cmd *cmd, struct bio *bio)
627 {
628 struct se_device *dev = cmd->se_dev;
629 struct blk_integrity *bi;
630 struct bio_integrity_payload *bip;
631 struct iblock_dev *ib_dev = IBLOCK_DEV(dev);
632 struct scatterlist *sg;
633 int i, rc;
634
635 bi = bdev_get_integrity(ib_dev->ibd_bd);
636 if (!bi) {
637 pr_err("Unable to locate bio_integrity\n");
638 return -ENODEV;
639 }
640
641 bip = bio_integrity_alloc(bio, GFP_NOIO, cmd->t_prot_nents);
642 if (IS_ERR(bip)) {
643 pr_err("Unable to allocate bio_integrity_payload\n");
644 return PTR_ERR(bip);
645 }
646
647 bip->bip_iter.bi_size = (cmd->data_length / dev->dev_attrib.block_size) *
648 dev->prot_length;
649 bip->bip_iter.bi_sector = bio->bi_iter.bi_sector;
650
651 pr_debug("IBLOCK BIP Size: %u Sector: %llu\n", bip->bip_iter.bi_size,
652 (unsigned long long)bip->bip_iter.bi_sector);
653
654 for_each_sg(cmd->t_prot_sg, sg, cmd->t_prot_nents, i) {
655
656 rc = bio_integrity_add_page(bio, sg_page(sg), sg->length,
657 sg->offset);
658 if (rc != sg->length) {
659 pr_err("bio_integrity_add_page() failed; %d\n", rc);
660 return -ENOMEM;
661 }
662
663 pr_debug("Added bio integrity page: %p length: %d offset; %d\n",
664 sg_page(sg), sg->length, sg->offset);
665 }
666
667 return 0;
668 }
669
670 static sense_reason_t
671 iblock_execute_rw(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents,
672 enum dma_data_direction data_direction)
673 {
674 struct se_device *dev = cmd->se_dev;
675 sector_t block_lba = target_to_linux_sector(dev, cmd->t_task_lba);
676 struct iblock_req *ibr;
677 struct bio *bio, *bio_start;
678 struct bio_list list;
679 struct scatterlist *sg;
680 u32 sg_num = sgl_nents;
681 unsigned bio_cnt;
682 int rw = 0;
683 int i;
684
685 if (data_direction == DMA_TO_DEVICE) {
686 struct iblock_dev *ib_dev = IBLOCK_DEV(dev);
687 struct request_queue *q = bdev_get_queue(ib_dev->ibd_bd);
688 /*
689 * Force writethrough using WRITE_FUA if a volatile write cache
690 * is not enabled, or if initiator set the Force Unit Access bit.
691 */
692 if (test_bit(QUEUE_FLAG_FUA, &q->queue_flags)) {
693 if (cmd->se_cmd_flags & SCF_FUA)
694 rw = WRITE_FUA;
695 else if (!test_bit(QUEUE_FLAG_WC, &q->queue_flags))
696 rw = WRITE_FUA;
697 else
698 rw = WRITE;
699 } else {
700 rw = WRITE;
701 }
702 } else {
703 rw = READ;
704 }
705
706 ibr = kzalloc(sizeof(struct iblock_req), GFP_KERNEL);
707 if (!ibr)
708 goto fail;
709 cmd->priv = ibr;
710
711 if (!sgl_nents) {
712 atomic_set(&ibr->pending, 1);
713 iblock_complete_cmd(cmd);
714 return 0;
715 }
716
717 bio = iblock_get_bio(cmd, block_lba, sgl_nents, rw);
718 if (!bio)
719 goto fail_free_ibr;
720
721 bio_start = bio;
722 bio_list_init(&list);
723 bio_list_add(&list, bio);
724
725 atomic_set(&ibr->pending, 2);
726 bio_cnt = 1;
727
728 for_each_sg(sgl, sg, sgl_nents, i) {
729 /*
730 * XXX: if the length the device accepts is shorter than the
731 * length of the S/G list entry this will cause and
732 * endless loop. Better hope no driver uses huge pages.
733 */
734 while (bio_add_page(bio, sg_page(sg), sg->length, sg->offset)
735 != sg->length) {
736 if (bio_cnt >= IBLOCK_MAX_BIO_PER_TASK) {
737 iblock_submit_bios(&list);
738 bio_cnt = 0;
739 }
740
741 bio = iblock_get_bio(cmd, block_lba, sg_num, rw);
742 if (!bio)
743 goto fail_put_bios;
744
745 atomic_inc(&ibr->pending);
746 bio_list_add(&list, bio);
747 bio_cnt++;
748 }
749
750 /* Always in 512 byte units for Linux/Block */
751 block_lba += sg->length >> IBLOCK_LBA_SHIFT;
752 sg_num--;
753 }
754
755 if (cmd->prot_type && dev->dev_attrib.pi_prot_type) {
756 int rc = iblock_alloc_bip(cmd, bio_start);
757 if (rc)
758 goto fail_put_bios;
759 }
760
761 iblock_submit_bios(&list);
762 iblock_complete_cmd(cmd);
763 return 0;
764
765 fail_put_bios:
766 while ((bio = bio_list_pop(&list)))
767 bio_put(bio);
768 fail_free_ibr:
769 kfree(ibr);
770 fail:
771 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
772 }
773
774 static sector_t iblock_get_blocks(struct se_device *dev)
775 {
776 struct iblock_dev *ib_dev = IBLOCK_DEV(dev);
777 struct block_device *bd = ib_dev->ibd_bd;
778 struct request_queue *q = bdev_get_queue(bd);
779
780 return iblock_emulate_read_cap_with_block_size(dev, bd, q);
781 }
782
783 static sector_t iblock_get_alignment_offset_lbas(struct se_device *dev)
784 {
785 struct iblock_dev *ib_dev = IBLOCK_DEV(dev);
786 struct block_device *bd = ib_dev->ibd_bd;
787 int ret;
788
789 ret = bdev_alignment_offset(bd);
790 if (ret == -1)
791 return 0;
792
793 /* convert offset-bytes to offset-lbas */
794 return ret / bdev_logical_block_size(bd);
795 }
796
797 static unsigned int iblock_get_lbppbe(struct se_device *dev)
798 {
799 struct iblock_dev *ib_dev = IBLOCK_DEV(dev);
800 struct block_device *bd = ib_dev->ibd_bd;
801 int logs_per_phys = bdev_physical_block_size(bd) / bdev_logical_block_size(bd);
802
803 return ilog2(logs_per_phys);
804 }
805
806 static unsigned int iblock_get_io_min(struct se_device *dev)
807 {
808 struct iblock_dev *ib_dev = IBLOCK_DEV(dev);
809 struct block_device *bd = ib_dev->ibd_bd;
810
811 return bdev_io_min(bd);
812 }
813
814 static unsigned int iblock_get_io_opt(struct se_device *dev)
815 {
816 struct iblock_dev *ib_dev = IBLOCK_DEV(dev);
817 struct block_device *bd = ib_dev->ibd_bd;
818
819 return bdev_io_opt(bd);
820 }
821
822 static struct sbc_ops iblock_sbc_ops = {
823 .execute_rw = iblock_execute_rw,
824 .execute_sync_cache = iblock_execute_sync_cache,
825 .execute_write_same = iblock_execute_write_same,
826 .execute_unmap = iblock_execute_unmap,
827 };
828
829 static sense_reason_t
830 iblock_parse_cdb(struct se_cmd *cmd)
831 {
832 return sbc_parse_cdb(cmd, &iblock_sbc_ops);
833 }
834
835 static bool iblock_get_write_cache(struct se_device *dev)
836 {
837 struct iblock_dev *ib_dev = IBLOCK_DEV(dev);
838 struct block_device *bd = ib_dev->ibd_bd;
839 struct request_queue *q = bdev_get_queue(bd);
840
841 return test_bit(QUEUE_FLAG_WC, &q->queue_flags);
842 }
843
844 static const struct target_backend_ops iblock_ops = {
845 .name = "iblock",
846 .inquiry_prod = "IBLOCK",
847 .inquiry_rev = IBLOCK_VERSION,
848 .owner = THIS_MODULE,
849 .attach_hba = iblock_attach_hba,
850 .detach_hba = iblock_detach_hba,
851 .alloc_device = iblock_alloc_device,
852 .configure_device = iblock_configure_device,
853 .free_device = iblock_free_device,
854 .parse_cdb = iblock_parse_cdb,
855 .set_configfs_dev_params = iblock_set_configfs_dev_params,
856 .show_configfs_dev_params = iblock_show_configfs_dev_params,
857 .get_device_type = sbc_get_device_type,
858 .get_blocks = iblock_get_blocks,
859 .get_alignment_offset_lbas = iblock_get_alignment_offset_lbas,
860 .get_lbppbe = iblock_get_lbppbe,
861 .get_io_min = iblock_get_io_min,
862 .get_io_opt = iblock_get_io_opt,
863 .get_write_cache = iblock_get_write_cache,
864 .tb_dev_attrib_attrs = sbc_attrib_attrs,
865 };
866
867 static int __init iblock_module_init(void)
868 {
869 return transport_backend_register(&iblock_ops);
870 }
871
872 static void __exit iblock_module_exit(void)
873 {
874 target_backend_unregister(&iblock_ops);
875 }
876
877 MODULE_DESCRIPTION("TCM IBLOCK subsystem plugin");
878 MODULE_AUTHOR("nab@Linux-iSCSI.org");
879 MODULE_LICENSE("GPL");
880
881 module_init(iblock_module_init);
882 module_exit(iblock_module_exit);
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