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 49static inline struct iblock_dev *IBLOCK_DEV(struct se_device *dev) 50{ 51 return container_of(dev, struct iblock_dev, dev); 52} 53 54 55static 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 63static void iblock_detach_hba(struct se_hba *hba) 64{ 65} 66 67static 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 82static 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 170out_blkdev_put: 171 blkdev_put(ib_dev->ibd_bd, FMODE_WRITE|FMODE_READ|FMODE_EXCL); 172out_free_bioset: 173 bioset_free(ib_dev->ibd_bio_set); 174 ib_dev->ibd_bio_set = NULL; 175out: 176 return ret; 177} 178 179static 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 187static 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 199static 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 278static 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 295static 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 314static struct bio * 315iblock_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 341static 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 352static 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 */ 373static sense_reason_t 374iblock_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 396static sense_reason_t 397iblock_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 415static sense_reason_t 416iblock_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 476fail_put_bios: 477 while ((bio = bio_list_pop(&list))) 478 bio_put(bio); 479fail_free_ibr: 480 kfree(ibr); 481fail: 482 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 483} 484 485enum { 486 Opt_udev_path, Opt_readonly, Opt_force, Opt_err 487}; 488 489static 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 496static 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 556out: 557 kfree(orig); 558 return (!ret) ? count : ret; 559} 560 561static 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 589static int 590iblock_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 (!bip) { 607 pr_err("Unable to allocate bio_integrity_payload\n"); 608 return -ENOMEM; 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 634static sense_reason_t 635iblock_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 729fail_put_bios: 730 while ((bio = bio_list_pop(&list))) 731 bio_put(bio); 732fail_free_ibr: 733 kfree(ibr); 734fail: 735 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 736} 737 738static 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 747static 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 761static 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 770static 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 778static 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 786static 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 793static sense_reason_t 794iblock_parse_cdb(struct se_cmd *cmd) 795{ 796 return sbc_parse_cdb(cmd, &iblock_sbc_ops); 797} 798 799static 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 808static 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 831static int __init iblock_module_init(void) 832{ 833 return transport_backend_register(&iblock_ops); 834} 835 836static void __exit iblock_module_exit(void) 837{ 838 target_backend_unregister(&iblock_ops); 839} 840 841MODULE_DESCRIPTION("TCM IBLOCK subsystem plugin"); 842MODULE_AUTHOR("nab@Linux-iSCSI.org"); 843MODULE_LICENSE("GPL"); 844 845module_init(iblock_module_init); 846module_exit(iblock_module_exit); 847