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 int ret; 448 449 ret = iblock_do_unmap(cmd, bdev, lba, nolb); 450 if (ret) 451 return ret; 452 453 target_complete_cmd(cmd, GOOD); 454 return 0; 455 } 456 457 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 sg = &cmd->t_data_sg[0]; 468 469 if (cmd->t_data_nents > 1 || 470 sg->length != cmd->se_dev->dev_attrib.block_size) { 471 pr_err("WRITE_SAME: Illegal SGL t_data_nents: %u length: %u" 472 " block_size: %u\n", cmd->t_data_nents, sg->length, 473 cmd->se_dev->dev_attrib.block_size); 474 return TCM_INVALID_CDB_FIELD; 475 } 476 477 ibr = kzalloc(sizeof(struct iblock_req), GFP_KERNEL); 478 if (!ibr) 479 goto fail; 480 cmd->priv = ibr; 481 482 bio = iblock_get_bio(cmd, block_lba, 1); 483 if (!bio) 484 goto fail_free_ibr; 485 486 bio_list_init(&list); 487 bio_list_add(&list, bio); 488 489 atomic_set(&ibr->pending, 1); 490 491 while (sectors) { 492 while (bio_add_page(bio, sg_page(sg), sg->length, sg->offset) 493 != sg->length) { 494 495 bio = iblock_get_bio(cmd, block_lba, 1); 496 if (!bio) 497 goto fail_put_bios; 498 499 atomic_inc(&ibr->pending); 500 bio_list_add(&list, bio); 501 } 502 503 /* Always in 512 byte units for Linux/Block */ 504 block_lba += sg->length >> IBLOCK_LBA_SHIFT; 505 sectors -= 1; 506 } 507 508 iblock_submit_bios(&list, WRITE); 509 return 0; 510 511 fail_put_bios: 512 while ((bio = bio_list_pop(&list))) 513 bio_put(bio); 514 fail_free_ibr: 515 kfree(ibr); 516 fail: 517 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 518 } 519 520 enum { 521 Opt_udev_path, Opt_readonly, Opt_force, Opt_err 522 }; 523 524 static match_table_t tokens = { 525 {Opt_udev_path, "udev_path=%s"}, 526 {Opt_readonly, "readonly=%d"}, 527 {Opt_force, "force=%d"}, 528 {Opt_err, NULL} 529 }; 530 531 static ssize_t iblock_set_configfs_dev_params(struct se_device *dev, 532 const char *page, ssize_t count) 533 { 534 struct iblock_dev *ib_dev = IBLOCK_DEV(dev); 535 char *orig, *ptr, *arg_p, *opts; 536 substring_t args[MAX_OPT_ARGS]; 537 int ret = 0, token; 538 unsigned long tmp_readonly; 539 540 opts = kstrdup(page, GFP_KERNEL); 541 if (!opts) 542 return -ENOMEM; 543 544 orig = opts; 545 546 while ((ptr = strsep(&opts, ",\n")) != NULL) { 547 if (!*ptr) 548 continue; 549 550 token = match_token(ptr, tokens, args); 551 switch (token) { 552 case Opt_udev_path: 553 if (ib_dev->ibd_bd) { 554 pr_err("Unable to set udev_path= while" 555 " ib_dev->ibd_bd exists\n"); 556 ret = -EEXIST; 557 goto out; 558 } 559 if (match_strlcpy(ib_dev->ibd_udev_path, &args[0], 560 SE_UDEV_PATH_LEN) == 0) { 561 ret = -EINVAL; 562 break; 563 } 564 pr_debug("IBLOCK: Referencing UDEV path: %s\n", 565 ib_dev->ibd_udev_path); 566 ib_dev->ibd_flags |= IBDF_HAS_UDEV_PATH; 567 break; 568 case Opt_readonly: 569 arg_p = match_strdup(&args[0]); 570 if (!arg_p) { 571 ret = -ENOMEM; 572 break; 573 } 574 ret = kstrtoul(arg_p, 0, &tmp_readonly); 575 kfree(arg_p); 576 if (ret < 0) { 577 pr_err("kstrtoul() failed for" 578 " readonly=\n"); 579 goto out; 580 } 581 ib_dev->ibd_readonly = tmp_readonly; 582 pr_debug("IBLOCK: readonly: %d\n", ib_dev->ibd_readonly); 583 break; 584 case Opt_force: 585 break; 586 default: 587 break; 588 } 589 } 590 591 out: 592 kfree(orig); 593 return (!ret) ? count : ret; 594 } 595 596 static ssize_t iblock_show_configfs_dev_params(struct se_device *dev, char *b) 597 { 598 struct iblock_dev *ib_dev = IBLOCK_DEV(dev); 599 struct block_device *bd = ib_dev->ibd_bd; 600 char buf[BDEVNAME_SIZE]; 601 ssize_t bl = 0; 602 603 if (bd) 604 bl += sprintf(b + bl, "iBlock device: %s", 605 bdevname(bd, buf)); 606 if (ib_dev->ibd_flags & IBDF_HAS_UDEV_PATH) 607 bl += sprintf(b + bl, " UDEV PATH: %s", 608 ib_dev->ibd_udev_path); 609 bl += sprintf(b + bl, " readonly: %d\n", ib_dev->ibd_readonly); 610 611 bl += sprintf(b + bl, " "); 612 if (bd) { 613 bl += sprintf(b + bl, "Major: %d Minor: %d %s\n", 614 MAJOR(bd->bd_dev), MINOR(bd->bd_dev), (!bd->bd_contains) ? 615 "" : (bd->bd_holder == ib_dev) ? 616 "CLAIMED: IBLOCK" : "CLAIMED: OS"); 617 } else { 618 bl += sprintf(b + bl, "Major: 0 Minor: 0\n"); 619 } 620 621 return bl; 622 } 623 624 static int 625 iblock_alloc_bip(struct se_cmd *cmd, struct bio *bio) 626 { 627 struct se_device *dev = cmd->se_dev; 628 struct blk_integrity *bi; 629 struct bio_integrity_payload *bip; 630 struct iblock_dev *ib_dev = IBLOCK_DEV(dev); 631 struct scatterlist *sg; 632 int i, rc; 633 634 bi = bdev_get_integrity(ib_dev->ibd_bd); 635 if (!bi) { 636 pr_err("Unable to locate bio_integrity\n"); 637 return -ENODEV; 638 } 639 640 bip = bio_integrity_alloc(bio, GFP_NOIO, cmd->t_prot_nents); 641 if (!bip) { 642 pr_err("Unable to allocate bio_integrity_payload\n"); 643 return -ENOMEM; 644 } 645 646 bip->bip_iter.bi_size = (cmd->data_length / dev->dev_attrib.block_size) * 647 dev->prot_length; 648 bip->bip_iter.bi_sector = bio->bi_iter.bi_sector; 649 650 pr_debug("IBLOCK BIP Size: %u Sector: %llu\n", bip->bip_iter.bi_size, 651 (unsigned long long)bip->bip_iter.bi_sector); 652 653 for_each_sg(cmd->t_prot_sg, sg, cmd->t_prot_nents, i) { 654 655 rc = bio_integrity_add_page(bio, sg_page(sg), sg->length, 656 sg->offset); 657 if (rc != sg->length) { 658 pr_err("bio_integrity_add_page() failed; %d\n", rc); 659 return -ENOMEM; 660 } 661 662 pr_debug("Added bio integrity page: %p length: %d offset; %d\n", 663 sg_page(sg), sg->length, sg->offset); 664 } 665 666 return 0; 667 } 668 669 static sense_reason_t 670 iblock_execute_rw(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents, 671 enum dma_data_direction data_direction) 672 { 673 struct se_device *dev = cmd->se_dev; 674 struct iblock_req *ibr; 675 struct bio *bio, *bio_start; 676 struct bio_list list; 677 struct scatterlist *sg; 678 u32 sg_num = sgl_nents; 679 sector_t block_lba; 680 unsigned bio_cnt; 681 int rw = 0; 682 int i; 683 684 if (data_direction == DMA_TO_DEVICE) { 685 struct iblock_dev *ib_dev = IBLOCK_DEV(dev); 686 struct request_queue *q = bdev_get_queue(ib_dev->ibd_bd); 687 /* 688 * Force writethrough using WRITE_FUA if a volatile write cache 689 * is not enabled, or if initiator set the Force Unit Access bit. 690 */ 691 if (q->flush_flags & REQ_FUA) { 692 if (cmd->se_cmd_flags & SCF_FUA) 693 rw = WRITE_FUA; 694 else if (!(q->flush_flags & REQ_FLUSH)) 695 rw = WRITE_FUA; 696 else 697 rw = WRITE; 698 } else { 699 rw = WRITE; 700 } 701 } else { 702 rw = READ; 703 } 704 705 /* 706 * Convert the blocksize advertised to the initiator to the 512 byte 707 * units unconditionally used by the Linux block layer. 708 */ 709 if (dev->dev_attrib.block_size == 4096) 710 block_lba = (cmd->t_task_lba << 3); 711 else if (dev->dev_attrib.block_size == 2048) 712 block_lba = (cmd->t_task_lba << 2); 713 else if (dev->dev_attrib.block_size == 1024) 714 block_lba = (cmd->t_task_lba << 1); 715 else if (dev->dev_attrib.block_size == 512) 716 block_lba = cmd->t_task_lba; 717 else { 718 pr_err("Unsupported SCSI -> BLOCK LBA conversion:" 719 " %u\n", dev->dev_attrib.block_size); 720 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 721 } 722 723 ibr = kzalloc(sizeof(struct iblock_req), GFP_KERNEL); 724 if (!ibr) 725 goto fail; 726 cmd->priv = ibr; 727 728 if (!sgl_nents) { 729 atomic_set(&ibr->pending, 1); 730 iblock_complete_cmd(cmd); 731 return 0; 732 } 733 734 bio = iblock_get_bio(cmd, block_lba, sgl_nents); 735 if (!bio) 736 goto fail_free_ibr; 737 738 bio_start = bio; 739 bio_list_init(&list); 740 bio_list_add(&list, bio); 741 742 atomic_set(&ibr->pending, 2); 743 bio_cnt = 1; 744 745 for_each_sg(sgl, sg, sgl_nents, i) { 746 /* 747 * XXX: if the length the device accepts is shorter than the 748 * length of the S/G list entry this will cause and 749 * endless loop. Better hope no driver uses huge pages. 750 */ 751 while (bio_add_page(bio, sg_page(sg), sg->length, sg->offset) 752 != sg->length) { 753 if (bio_cnt >= IBLOCK_MAX_BIO_PER_TASK) { 754 iblock_submit_bios(&list, rw); 755 bio_cnt = 0; 756 } 757 758 bio = iblock_get_bio(cmd, block_lba, sg_num); 759 if (!bio) 760 goto fail_put_bios; 761 762 atomic_inc(&ibr->pending); 763 bio_list_add(&list, bio); 764 bio_cnt++; 765 } 766 767 /* Always in 512 byte units for Linux/Block */ 768 block_lba += sg->length >> IBLOCK_LBA_SHIFT; 769 sg_num--; 770 } 771 772 if (cmd->prot_type) { 773 int rc = iblock_alloc_bip(cmd, bio_start); 774 if (rc) 775 goto fail_put_bios; 776 } 777 778 iblock_submit_bios(&list, rw); 779 iblock_complete_cmd(cmd); 780 return 0; 781 782 fail_put_bios: 783 while ((bio = bio_list_pop(&list))) 784 bio_put(bio); 785 fail_free_ibr: 786 kfree(ibr); 787 fail: 788 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 789 } 790 791 static sector_t iblock_get_blocks(struct se_device *dev) 792 { 793 struct iblock_dev *ib_dev = IBLOCK_DEV(dev); 794 struct block_device *bd = ib_dev->ibd_bd; 795 struct request_queue *q = bdev_get_queue(bd); 796 797 return iblock_emulate_read_cap_with_block_size(dev, bd, q); 798 } 799 800 static sector_t iblock_get_alignment_offset_lbas(struct se_device *dev) 801 { 802 struct iblock_dev *ib_dev = IBLOCK_DEV(dev); 803 struct block_device *bd = ib_dev->ibd_bd; 804 int ret; 805 806 ret = bdev_alignment_offset(bd); 807 if (ret == -1) 808 return 0; 809 810 /* convert offset-bytes to offset-lbas */ 811 return ret / bdev_logical_block_size(bd); 812 } 813 814 static unsigned int iblock_get_lbppbe(struct se_device *dev) 815 { 816 struct iblock_dev *ib_dev = IBLOCK_DEV(dev); 817 struct block_device *bd = ib_dev->ibd_bd; 818 int logs_per_phys = bdev_physical_block_size(bd) / bdev_logical_block_size(bd); 819 820 return ilog2(logs_per_phys); 821 } 822 823 static unsigned int iblock_get_io_min(struct se_device *dev) 824 { 825 struct iblock_dev *ib_dev = IBLOCK_DEV(dev); 826 struct block_device *bd = ib_dev->ibd_bd; 827 828 return bdev_io_min(bd); 829 } 830 831 static unsigned int iblock_get_io_opt(struct se_device *dev) 832 { 833 struct iblock_dev *ib_dev = IBLOCK_DEV(dev); 834 struct block_device *bd = ib_dev->ibd_bd; 835 836 return bdev_io_opt(bd); 837 } 838 839 static struct sbc_ops iblock_sbc_ops = { 840 .execute_rw = iblock_execute_rw, 841 .execute_sync_cache = iblock_execute_sync_cache, 842 .execute_write_same = iblock_execute_write_same, 843 .execute_write_same_unmap = iblock_execute_write_same_unmap, 844 .execute_unmap = iblock_execute_unmap, 845 }; 846 847 static sense_reason_t 848 iblock_parse_cdb(struct se_cmd *cmd) 849 { 850 return sbc_parse_cdb(cmd, &iblock_sbc_ops); 851 } 852 853 static bool iblock_get_write_cache(struct se_device *dev) 854 { 855 struct iblock_dev *ib_dev = IBLOCK_DEV(dev); 856 struct block_device *bd = ib_dev->ibd_bd; 857 struct request_queue *q = bdev_get_queue(bd); 858 859 return q->flush_flags & REQ_FLUSH; 860 } 861 862 DEF_TB_DEFAULT_ATTRIBS(iblock); 863 864 static struct configfs_attribute *iblock_backend_dev_attrs[] = { 865 &iblock_dev_attrib_emulate_model_alias.attr, 866 &iblock_dev_attrib_emulate_dpo.attr, 867 &iblock_dev_attrib_emulate_fua_write.attr, 868 &iblock_dev_attrib_emulate_fua_read.attr, 869 &iblock_dev_attrib_emulate_write_cache.attr, 870 &iblock_dev_attrib_emulate_ua_intlck_ctrl.attr, 871 &iblock_dev_attrib_emulate_tas.attr, 872 &iblock_dev_attrib_emulate_tpu.attr, 873 &iblock_dev_attrib_emulate_tpws.attr, 874 &iblock_dev_attrib_emulate_caw.attr, 875 &iblock_dev_attrib_emulate_3pc.attr, 876 &iblock_dev_attrib_pi_prot_type.attr, 877 &iblock_dev_attrib_hw_pi_prot_type.attr, 878 &iblock_dev_attrib_pi_prot_format.attr, 879 &iblock_dev_attrib_enforce_pr_isids.attr, 880 &iblock_dev_attrib_is_nonrot.attr, 881 &iblock_dev_attrib_emulate_rest_reord.attr, 882 &iblock_dev_attrib_force_pr_aptpl.attr, 883 &iblock_dev_attrib_hw_block_size.attr, 884 &iblock_dev_attrib_block_size.attr, 885 &iblock_dev_attrib_hw_max_sectors.attr, 886 &iblock_dev_attrib_optimal_sectors.attr, 887 &iblock_dev_attrib_hw_queue_depth.attr, 888 &iblock_dev_attrib_queue_depth.attr, 889 &iblock_dev_attrib_max_unmap_lba_count.attr, 890 &iblock_dev_attrib_max_unmap_block_desc_count.attr, 891 &iblock_dev_attrib_unmap_granularity.attr, 892 &iblock_dev_attrib_unmap_granularity_alignment.attr, 893 &iblock_dev_attrib_max_write_same_len.attr, 894 NULL, 895 }; 896 897 static struct se_subsystem_api iblock_template = { 898 .name = "iblock", 899 .inquiry_prod = "IBLOCK", 900 .inquiry_rev = IBLOCK_VERSION, 901 .owner = THIS_MODULE, 902 .transport_type = TRANSPORT_PLUGIN_VHBA_PDEV, 903 .attach_hba = iblock_attach_hba, 904 .detach_hba = iblock_detach_hba, 905 .alloc_device = iblock_alloc_device, 906 .configure_device = iblock_configure_device, 907 .free_device = iblock_free_device, 908 .parse_cdb = iblock_parse_cdb, 909 .set_configfs_dev_params = iblock_set_configfs_dev_params, 910 .show_configfs_dev_params = iblock_show_configfs_dev_params, 911 .get_device_type = sbc_get_device_type, 912 .get_blocks = iblock_get_blocks, 913 .get_alignment_offset_lbas = iblock_get_alignment_offset_lbas, 914 .get_lbppbe = iblock_get_lbppbe, 915 .get_io_min = iblock_get_io_min, 916 .get_io_opt = iblock_get_io_opt, 917 .get_write_cache = iblock_get_write_cache, 918 }; 919 920 static int __init iblock_module_init(void) 921 { 922 struct target_backend_cits *tbc = &iblock_template.tb_cits; 923 924 target_core_setup_sub_cits(&iblock_template); 925 tbc->tb_dev_attrib_cit.ct_attrs = iblock_backend_dev_attrs; 926 927 return transport_subsystem_register(&iblock_template); 928 } 929 930 static void __exit iblock_module_exit(void) 931 { 932 transport_subsystem_release(&iblock_template); 933 } 934 935 MODULE_DESCRIPTION("TCM IBLOCK subsystem plugin"); 936 MODULE_AUTHOR("nab@Linux-iSCSI.org"); 937 MODULE_LICENSE("GPL"); 938 939 module_init(iblock_module_init); 940 module_exit(iblock_module_exit); 941