1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /******************************************************************************* 3 * Filename: target_core_iblock.c 4 * 5 * This file contains the Storage Engine <-> Linux BlockIO transport 6 * specific functions. 7 * 8 * (c) Copyright 2003-2013 Datera, Inc. 9 * 10 * Nicholas A. Bellinger <nab@kernel.org> 11 * 12 ******************************************************************************/ 13 14 #include <linux/string.h> 15 #include <linux/parser.h> 16 #include <linux/timer.h> 17 #include <linux/fs.h> 18 #include <linux/blkdev.h> 19 #include <linux/blk-integrity.h> 20 #include <linux/slab.h> 21 #include <linux/spinlock.h> 22 #include <linux/bio.h> 23 #include <linux/file.h> 24 #include <linux/module.h> 25 #include <linux/scatterlist.h> 26 #include <linux/pr.h> 27 #include <scsi/scsi_proto.h> 28 #include <scsi/scsi_common.h> 29 #include <asm/unaligned.h> 30 31 #include <target/target_core_base.h> 32 #include <target/target_core_backend.h> 33 34 #include "target_core_iblock.h" 35 #include "target_core_pr.h" 36 37 #define IBLOCK_MAX_BIO_PER_TASK 32 /* max # of bios to submit at a time */ 38 #define IBLOCK_BIO_POOL_SIZE 128 39 40 static inline struct iblock_dev *IBLOCK_DEV(struct se_device *dev) 41 { 42 return container_of(dev, struct iblock_dev, dev); 43 } 44 45 46 static int iblock_attach_hba(struct se_hba *hba, u32 host_id) 47 { 48 pr_debug("CORE_HBA[%d] - TCM iBlock HBA Driver %s on" 49 " Generic Target Core Stack %s\n", hba->hba_id, 50 IBLOCK_VERSION, TARGET_CORE_VERSION); 51 return 0; 52 } 53 54 static void iblock_detach_hba(struct se_hba *hba) 55 { 56 } 57 58 static struct se_device *iblock_alloc_device(struct se_hba *hba, const char *name) 59 { 60 struct iblock_dev *ib_dev = NULL; 61 62 ib_dev = kzalloc(sizeof(struct iblock_dev), GFP_KERNEL); 63 if (!ib_dev) { 64 pr_err("Unable to allocate struct iblock_dev\n"); 65 return NULL; 66 } 67 68 ib_dev->ibd_plug = kcalloc(nr_cpu_ids, sizeof(*ib_dev->ibd_plug), 69 GFP_KERNEL); 70 if (!ib_dev->ibd_plug) 71 goto free_dev; 72 73 pr_debug( "IBLOCK: Allocated ib_dev for %s\n", name); 74 75 return &ib_dev->dev; 76 77 free_dev: 78 kfree(ib_dev); 79 return NULL; 80 } 81 82 static bool iblock_configure_unmap(struct se_device *dev) 83 { 84 struct iblock_dev *ib_dev = IBLOCK_DEV(dev); 85 86 return target_configure_unmap_from_queue(&dev->dev_attrib, 87 ib_dev->ibd_bd); 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 blk_mode_t mode = BLK_OPEN_READ; 97 unsigned int max_write_zeroes_sectors; 98 int ret; 99 100 if (!(ib_dev->ibd_flags & IBDF_HAS_UDEV_PATH)) { 101 pr_err("Missing udev_path= parameters for IBLOCK\n"); 102 return -EINVAL; 103 } 104 105 ret = bioset_init(&ib_dev->ibd_bio_set, IBLOCK_BIO_POOL_SIZE, 0, BIOSET_NEED_BVECS); 106 if (ret) { 107 pr_err("IBLOCK: Unable to create bioset\n"); 108 goto out; 109 } 110 111 pr_debug( "IBLOCK: Claiming struct block_device: %s\n", 112 ib_dev->ibd_udev_path); 113 114 if (!ib_dev->ibd_readonly) 115 mode |= BLK_OPEN_WRITE; 116 else 117 dev->dev_flags |= DF_READ_ONLY; 118 119 bd = blkdev_get_by_path(ib_dev->ibd_udev_path, mode, ib_dev, NULL); 120 if (IS_ERR(bd)) { 121 ret = PTR_ERR(bd); 122 goto out_free_bioset; 123 } 124 ib_dev->ibd_bd = bd; 125 126 q = bdev_get_queue(bd); 127 128 dev->dev_attrib.hw_block_size = bdev_logical_block_size(bd); 129 dev->dev_attrib.hw_max_sectors = mult_frac(queue_max_hw_sectors(q), 130 SECTOR_SIZE, 131 dev->dev_attrib.hw_block_size); 132 dev->dev_attrib.hw_queue_depth = q->nr_requests; 133 134 /* 135 * Enable write same emulation for IBLOCK and use 0xFFFF as 136 * the smaller WRITE_SAME(10) only has a two-byte block count. 137 */ 138 max_write_zeroes_sectors = bdev_write_zeroes_sectors(bd); 139 if (max_write_zeroes_sectors) 140 dev->dev_attrib.max_write_same_len = max_write_zeroes_sectors; 141 else 142 dev->dev_attrib.max_write_same_len = 0xFFFF; 143 144 if (bdev_nonrot(bd)) 145 dev->dev_attrib.is_nonrot = 1; 146 147 bi = bdev_get_integrity(bd); 148 if (bi) { 149 struct bio_set *bs = &ib_dev->ibd_bio_set; 150 151 if (!strcmp(bi->profile->name, "T10-DIF-TYPE3-IP") || 152 !strcmp(bi->profile->name, "T10-DIF-TYPE1-IP")) { 153 pr_err("IBLOCK export of blk_integrity: %s not" 154 " supported\n", bi->profile->name); 155 ret = -ENOSYS; 156 goto out_blkdev_put; 157 } 158 159 if (!strcmp(bi->profile->name, "T10-DIF-TYPE3-CRC")) { 160 dev->dev_attrib.pi_prot_type = TARGET_DIF_TYPE3_PROT; 161 } else if (!strcmp(bi->profile->name, "T10-DIF-TYPE1-CRC")) { 162 dev->dev_attrib.pi_prot_type = TARGET_DIF_TYPE1_PROT; 163 } 164 165 if (dev->dev_attrib.pi_prot_type) { 166 if (bioset_integrity_create(bs, IBLOCK_BIO_POOL_SIZE) < 0) { 167 pr_err("Unable to allocate bioset for PI\n"); 168 ret = -ENOMEM; 169 goto out_blkdev_put; 170 } 171 pr_debug("IBLOCK setup BIP bs->bio_integrity_pool: %p\n", 172 &bs->bio_integrity_pool); 173 } 174 dev->dev_attrib.hw_pi_prot_type = dev->dev_attrib.pi_prot_type; 175 } 176 177 return 0; 178 179 out_blkdev_put: 180 blkdev_put(ib_dev->ibd_bd, ib_dev); 181 out_free_bioset: 182 bioset_exit(&ib_dev->ibd_bio_set); 183 out: 184 return ret; 185 } 186 187 static void iblock_dev_call_rcu(struct rcu_head *p) 188 { 189 struct se_device *dev = container_of(p, struct se_device, rcu_head); 190 struct iblock_dev *ib_dev = IBLOCK_DEV(dev); 191 192 kfree(ib_dev->ibd_plug); 193 kfree(ib_dev); 194 } 195 196 static void iblock_free_device(struct se_device *dev) 197 { 198 call_rcu(&dev->rcu_head, iblock_dev_call_rcu); 199 } 200 201 static void iblock_destroy_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, ib_dev); 207 bioset_exit(&ib_dev->ibd_bio_set); 208 } 209 210 static struct se_dev_plug *iblock_plug_device(struct se_device *se_dev) 211 { 212 struct iblock_dev *ib_dev = IBLOCK_DEV(se_dev); 213 struct iblock_dev_plug *ib_dev_plug; 214 215 /* 216 * Each se_device has a per cpu work this can be run from. We 217 * shouldn't have multiple threads on the same cpu calling this 218 * at the same time. 219 */ 220 ib_dev_plug = &ib_dev->ibd_plug[raw_smp_processor_id()]; 221 if (test_and_set_bit(IBD_PLUGF_PLUGGED, &ib_dev_plug->flags)) 222 return NULL; 223 224 blk_start_plug(&ib_dev_plug->blk_plug); 225 return &ib_dev_plug->se_plug; 226 } 227 228 static void iblock_unplug_device(struct se_dev_plug *se_plug) 229 { 230 struct iblock_dev_plug *ib_dev_plug = container_of(se_plug, 231 struct iblock_dev_plug, se_plug); 232 233 blk_finish_plug(&ib_dev_plug->blk_plug); 234 clear_bit(IBD_PLUGF_PLUGGED, &ib_dev_plug->flags); 235 } 236 237 static sector_t iblock_get_blocks(struct se_device *dev) 238 { 239 struct iblock_dev *ib_dev = IBLOCK_DEV(dev); 240 u32 block_size = bdev_logical_block_size(ib_dev->ibd_bd); 241 unsigned long long blocks_long = 242 div_u64(bdev_nr_bytes(ib_dev->ibd_bd), block_size) - 1; 243 244 if (block_size == dev->dev_attrib.block_size) 245 return blocks_long; 246 247 switch (block_size) { 248 case 4096: 249 switch (dev->dev_attrib.block_size) { 250 case 2048: 251 blocks_long <<= 1; 252 break; 253 case 1024: 254 blocks_long <<= 2; 255 break; 256 case 512: 257 blocks_long <<= 3; 258 break; 259 default: 260 break; 261 } 262 break; 263 case 2048: 264 switch (dev->dev_attrib.block_size) { 265 case 4096: 266 blocks_long >>= 1; 267 break; 268 case 1024: 269 blocks_long <<= 1; 270 break; 271 case 512: 272 blocks_long <<= 2; 273 break; 274 default: 275 break; 276 } 277 break; 278 case 1024: 279 switch (dev->dev_attrib.block_size) { 280 case 4096: 281 blocks_long >>= 2; 282 break; 283 case 2048: 284 blocks_long >>= 1; 285 break; 286 case 512: 287 blocks_long <<= 1; 288 break; 289 default: 290 break; 291 } 292 break; 293 case 512: 294 switch (dev->dev_attrib.block_size) { 295 case 4096: 296 blocks_long >>= 3; 297 break; 298 case 2048: 299 blocks_long >>= 2; 300 break; 301 case 1024: 302 blocks_long >>= 1; 303 break; 304 default: 305 break; 306 } 307 break; 308 default: 309 break; 310 } 311 312 return blocks_long; 313 } 314 315 static void iblock_complete_cmd(struct se_cmd *cmd, blk_status_t blk_status) 316 { 317 struct iblock_req *ibr = cmd->priv; 318 u8 status; 319 320 if (!refcount_dec_and_test(&ibr->pending)) 321 return; 322 323 if (blk_status == BLK_STS_RESV_CONFLICT) 324 status = SAM_STAT_RESERVATION_CONFLICT; 325 else if (atomic_read(&ibr->ib_bio_err_cnt)) 326 status = SAM_STAT_CHECK_CONDITION; 327 else 328 status = SAM_STAT_GOOD; 329 330 target_complete_cmd(cmd, status); 331 kfree(ibr); 332 } 333 334 static void iblock_bio_done(struct bio *bio) 335 { 336 struct se_cmd *cmd = bio->bi_private; 337 struct iblock_req *ibr = cmd->priv; 338 blk_status_t blk_status = bio->bi_status; 339 340 if (bio->bi_status) { 341 pr_err("bio error: %p, err: %d\n", bio, bio->bi_status); 342 /* 343 * Bump the ib_bio_err_cnt and release bio. 344 */ 345 atomic_inc(&ibr->ib_bio_err_cnt); 346 smp_mb__after_atomic(); 347 } 348 349 bio_put(bio); 350 351 iblock_complete_cmd(cmd, blk_status); 352 } 353 354 static struct bio *iblock_get_bio(struct se_cmd *cmd, sector_t lba, u32 sg_num, 355 blk_opf_t opf) 356 { 357 struct iblock_dev *ib_dev = IBLOCK_DEV(cmd->se_dev); 358 struct bio *bio; 359 360 /* 361 * Only allocate as many vector entries as the bio code allows us to, 362 * we'll loop later on until we have handled the whole request. 363 */ 364 bio = bio_alloc_bioset(ib_dev->ibd_bd, bio_max_segs(sg_num), opf, 365 GFP_NOIO, &ib_dev->ibd_bio_set); 366 if (!bio) { 367 pr_err("Unable to allocate memory for bio\n"); 368 return NULL; 369 } 370 371 bio->bi_private = cmd; 372 bio->bi_end_io = &iblock_bio_done; 373 bio->bi_iter.bi_sector = lba; 374 375 return bio; 376 } 377 378 static void iblock_submit_bios(struct bio_list *list) 379 { 380 struct blk_plug plug; 381 struct bio *bio; 382 /* 383 * The block layer handles nested plugs, so just plug/unplug to handle 384 * fabric drivers that didn't support batching and multi bio cmds. 385 */ 386 blk_start_plug(&plug); 387 while ((bio = bio_list_pop(list))) 388 submit_bio(bio); 389 blk_finish_plug(&plug); 390 } 391 392 static void iblock_end_io_flush(struct bio *bio) 393 { 394 struct se_cmd *cmd = bio->bi_private; 395 396 if (bio->bi_status) 397 pr_err("IBLOCK: cache flush failed: %d\n", bio->bi_status); 398 399 if (cmd) { 400 if (bio->bi_status) 401 target_complete_cmd(cmd, SAM_STAT_CHECK_CONDITION); 402 else 403 target_complete_cmd(cmd, SAM_STAT_GOOD); 404 } 405 406 bio_put(bio); 407 } 408 409 /* 410 * Implement SYCHRONIZE CACHE. Note that we can't handle lba ranges and must 411 * always flush the whole cache. 412 */ 413 static sense_reason_t 414 iblock_execute_sync_cache(struct se_cmd *cmd) 415 { 416 struct iblock_dev *ib_dev = IBLOCK_DEV(cmd->se_dev); 417 int immed = (cmd->t_task_cdb[1] & 0x2); 418 struct bio *bio; 419 420 /* 421 * If the Immediate bit is set, queue up the GOOD response 422 * for this SYNCHRONIZE_CACHE op. 423 */ 424 if (immed) 425 target_complete_cmd(cmd, SAM_STAT_GOOD); 426 427 bio = bio_alloc(ib_dev->ibd_bd, 0, REQ_OP_WRITE | REQ_PREFLUSH, 428 GFP_KERNEL); 429 bio->bi_end_io = iblock_end_io_flush; 430 if (!immed) 431 bio->bi_private = cmd; 432 submit_bio(bio); 433 return 0; 434 } 435 436 static sense_reason_t 437 iblock_execute_unmap(struct se_cmd *cmd, sector_t lba, sector_t nolb) 438 { 439 struct block_device *bdev = IBLOCK_DEV(cmd->se_dev)->ibd_bd; 440 struct se_device *dev = cmd->se_dev; 441 int ret; 442 443 ret = blkdev_issue_discard(bdev, 444 target_to_linux_sector(dev, lba), 445 target_to_linux_sector(dev, nolb), 446 GFP_KERNEL); 447 if (ret < 0) { 448 pr_err("blkdev_issue_discard() failed: %d\n", ret); 449 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 450 } 451 452 return 0; 453 } 454 455 static sense_reason_t 456 iblock_execute_zero_out(struct block_device *bdev, struct se_cmd *cmd) 457 { 458 struct se_device *dev = cmd->se_dev; 459 struct scatterlist *sg = &cmd->t_data_sg[0]; 460 unsigned char *buf, *not_zero; 461 int ret; 462 463 buf = kmap(sg_page(sg)) + sg->offset; 464 if (!buf) 465 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 466 /* 467 * Fall back to block_execute_write_same() slow-path if 468 * incoming WRITE_SAME payload does not contain zeros. 469 */ 470 not_zero = memchr_inv(buf, 0x00, cmd->data_length); 471 kunmap(sg_page(sg)); 472 473 if (not_zero) 474 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 475 476 ret = blkdev_issue_zeroout(bdev, 477 target_to_linux_sector(dev, cmd->t_task_lba), 478 target_to_linux_sector(dev, 479 sbc_get_write_same_sectors(cmd)), 480 GFP_KERNEL, BLKDEV_ZERO_NOUNMAP); 481 if (ret) 482 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 483 484 target_complete_cmd(cmd, SAM_STAT_GOOD); 485 return 0; 486 } 487 488 static sense_reason_t 489 iblock_execute_write_same(struct se_cmd *cmd) 490 { 491 struct block_device *bdev = IBLOCK_DEV(cmd->se_dev)->ibd_bd; 492 struct iblock_req *ibr; 493 struct scatterlist *sg; 494 struct bio *bio; 495 struct bio_list list; 496 struct se_device *dev = cmd->se_dev; 497 sector_t block_lba = target_to_linux_sector(dev, cmd->t_task_lba); 498 sector_t sectors = target_to_linux_sector(dev, 499 sbc_get_write_same_sectors(cmd)); 500 501 if (cmd->prot_op) { 502 pr_err("WRITE_SAME: Protection information with IBLOCK" 503 " backends not supported\n"); 504 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 505 } 506 507 if (!cmd->t_data_nents) 508 return TCM_INVALID_CDB_FIELD; 509 510 sg = &cmd->t_data_sg[0]; 511 512 if (cmd->t_data_nents > 1 || 513 sg->length != cmd->se_dev->dev_attrib.block_size) { 514 pr_err("WRITE_SAME: Illegal SGL t_data_nents: %u length: %u" 515 " block_size: %u\n", cmd->t_data_nents, sg->length, 516 cmd->se_dev->dev_attrib.block_size); 517 return TCM_INVALID_CDB_FIELD; 518 } 519 520 if (bdev_write_zeroes_sectors(bdev)) { 521 if (!iblock_execute_zero_out(bdev, cmd)) 522 return 0; 523 } 524 525 ibr = kzalloc(sizeof(struct iblock_req), GFP_KERNEL); 526 if (!ibr) 527 goto fail; 528 cmd->priv = ibr; 529 530 bio = iblock_get_bio(cmd, block_lba, 1, REQ_OP_WRITE); 531 if (!bio) 532 goto fail_free_ibr; 533 534 bio_list_init(&list); 535 bio_list_add(&list, bio); 536 537 refcount_set(&ibr->pending, 1); 538 539 while (sectors) { 540 while (bio_add_page(bio, sg_page(sg), sg->length, sg->offset) 541 != sg->length) { 542 543 bio = iblock_get_bio(cmd, block_lba, 1, REQ_OP_WRITE); 544 if (!bio) 545 goto fail_put_bios; 546 547 refcount_inc(&ibr->pending); 548 bio_list_add(&list, bio); 549 } 550 551 /* Always in 512 byte units for Linux/Block */ 552 block_lba += sg->length >> SECTOR_SHIFT; 553 sectors -= sg->length >> SECTOR_SHIFT; 554 } 555 556 iblock_submit_bios(&list); 557 return 0; 558 559 fail_put_bios: 560 while ((bio = bio_list_pop(&list))) 561 bio_put(bio); 562 fail_free_ibr: 563 kfree(ibr); 564 fail: 565 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 566 } 567 568 enum { 569 Opt_udev_path, Opt_readonly, Opt_force, Opt_err 570 }; 571 572 static match_table_t tokens = { 573 {Opt_udev_path, "udev_path=%s"}, 574 {Opt_readonly, "readonly=%d"}, 575 {Opt_force, "force=%d"}, 576 {Opt_err, NULL} 577 }; 578 579 static ssize_t iblock_set_configfs_dev_params(struct se_device *dev, 580 const char *page, ssize_t count) 581 { 582 struct iblock_dev *ib_dev = IBLOCK_DEV(dev); 583 char *orig, *ptr, *arg_p, *opts; 584 substring_t args[MAX_OPT_ARGS]; 585 int ret = 0, token; 586 unsigned long tmp_readonly; 587 588 opts = kstrdup(page, GFP_KERNEL); 589 if (!opts) 590 return -ENOMEM; 591 592 orig = opts; 593 594 while ((ptr = strsep(&opts, ",\n")) != NULL) { 595 if (!*ptr) 596 continue; 597 598 token = match_token(ptr, tokens, args); 599 switch (token) { 600 case Opt_udev_path: 601 if (ib_dev->ibd_bd) { 602 pr_err("Unable to set udev_path= while" 603 " ib_dev->ibd_bd exists\n"); 604 ret = -EEXIST; 605 goto out; 606 } 607 if (match_strlcpy(ib_dev->ibd_udev_path, &args[0], 608 SE_UDEV_PATH_LEN) == 0) { 609 ret = -EINVAL; 610 break; 611 } 612 pr_debug("IBLOCK: Referencing UDEV path: %s\n", 613 ib_dev->ibd_udev_path); 614 ib_dev->ibd_flags |= IBDF_HAS_UDEV_PATH; 615 break; 616 case Opt_readonly: 617 arg_p = match_strdup(&args[0]); 618 if (!arg_p) { 619 ret = -ENOMEM; 620 break; 621 } 622 ret = kstrtoul(arg_p, 0, &tmp_readonly); 623 kfree(arg_p); 624 if (ret < 0) { 625 pr_err("kstrtoul() failed for" 626 " readonly=\n"); 627 goto out; 628 } 629 ib_dev->ibd_readonly = tmp_readonly; 630 pr_debug("IBLOCK: readonly: %d\n", ib_dev->ibd_readonly); 631 break; 632 case Opt_force: 633 break; 634 default: 635 break; 636 } 637 } 638 639 out: 640 kfree(orig); 641 return (!ret) ? count : ret; 642 } 643 644 static ssize_t iblock_show_configfs_dev_params(struct se_device *dev, char *b) 645 { 646 struct iblock_dev *ib_dev = IBLOCK_DEV(dev); 647 struct block_device *bd = ib_dev->ibd_bd; 648 ssize_t bl = 0; 649 650 if (bd) 651 bl += sprintf(b + bl, "iBlock device: %pg", bd); 652 if (ib_dev->ibd_flags & IBDF_HAS_UDEV_PATH) 653 bl += sprintf(b + bl, " UDEV PATH: %s", 654 ib_dev->ibd_udev_path); 655 bl += sprintf(b + bl, " readonly: %d\n", ib_dev->ibd_readonly); 656 657 bl += sprintf(b + bl, " "); 658 if (bd) { 659 bl += sprintf(b + bl, "Major: %d Minor: %d %s\n", 660 MAJOR(bd->bd_dev), MINOR(bd->bd_dev), 661 "CLAIMED: IBLOCK"); 662 } else { 663 bl += sprintf(b + bl, "Major: 0 Minor: 0\n"); 664 } 665 666 return bl; 667 } 668 669 static int 670 iblock_alloc_bip(struct se_cmd *cmd, struct bio *bio, 671 struct sg_mapping_iter *miter) 672 { 673 struct se_device *dev = cmd->se_dev; 674 struct blk_integrity *bi; 675 struct bio_integrity_payload *bip; 676 struct iblock_dev *ib_dev = IBLOCK_DEV(dev); 677 int rc; 678 size_t resid, len; 679 680 bi = bdev_get_integrity(ib_dev->ibd_bd); 681 if (!bi) { 682 pr_err("Unable to locate bio_integrity\n"); 683 return -ENODEV; 684 } 685 686 bip = bio_integrity_alloc(bio, GFP_NOIO, bio_max_segs(cmd->t_prot_nents)); 687 if (IS_ERR(bip)) { 688 pr_err("Unable to allocate bio_integrity_payload\n"); 689 return PTR_ERR(bip); 690 } 691 692 bip->bip_iter.bi_size = bio_integrity_bytes(bi, bio_sectors(bio)); 693 /* virtual start sector must be in integrity interval units */ 694 bip_set_seed(bip, bio->bi_iter.bi_sector >> 695 (bi->interval_exp - SECTOR_SHIFT)); 696 697 pr_debug("IBLOCK BIP Size: %u Sector: %llu\n", bip->bip_iter.bi_size, 698 (unsigned long long)bip->bip_iter.bi_sector); 699 700 resid = bip->bip_iter.bi_size; 701 while (resid > 0 && sg_miter_next(miter)) { 702 703 len = min_t(size_t, miter->length, resid); 704 rc = bio_integrity_add_page(bio, miter->page, len, 705 offset_in_page(miter->addr)); 706 if (rc != len) { 707 pr_err("bio_integrity_add_page() failed; %d\n", rc); 708 sg_miter_stop(miter); 709 return -ENOMEM; 710 } 711 712 pr_debug("Added bio integrity page: %p length: %zu offset: %lu\n", 713 miter->page, len, offset_in_page(miter->addr)); 714 715 resid -= len; 716 if (len < miter->length) 717 miter->consumed -= miter->length - len; 718 } 719 sg_miter_stop(miter); 720 721 return 0; 722 } 723 724 static sense_reason_t 725 iblock_execute_rw(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents, 726 enum dma_data_direction data_direction) 727 { 728 struct se_device *dev = cmd->se_dev; 729 sector_t block_lba = target_to_linux_sector(dev, cmd->t_task_lba); 730 struct iblock_req *ibr; 731 struct bio *bio; 732 struct bio_list list; 733 struct scatterlist *sg; 734 u32 sg_num = sgl_nents; 735 blk_opf_t opf; 736 unsigned bio_cnt; 737 int i, rc; 738 struct sg_mapping_iter prot_miter; 739 unsigned int miter_dir; 740 741 if (data_direction == DMA_TO_DEVICE) { 742 struct iblock_dev *ib_dev = IBLOCK_DEV(dev); 743 /* 744 * Force writethrough using REQ_FUA if a volatile write cache 745 * is not enabled, or if initiator set the Force Unit Access bit. 746 */ 747 opf = REQ_OP_WRITE; 748 miter_dir = SG_MITER_TO_SG; 749 if (bdev_fua(ib_dev->ibd_bd)) { 750 if (cmd->se_cmd_flags & SCF_FUA) 751 opf |= REQ_FUA; 752 else if (!bdev_write_cache(ib_dev->ibd_bd)) 753 opf |= REQ_FUA; 754 } 755 } else { 756 opf = REQ_OP_READ; 757 miter_dir = SG_MITER_FROM_SG; 758 } 759 760 ibr = kzalloc(sizeof(struct iblock_req), GFP_KERNEL); 761 if (!ibr) 762 goto fail; 763 cmd->priv = ibr; 764 765 if (!sgl_nents) { 766 refcount_set(&ibr->pending, 1); 767 iblock_complete_cmd(cmd, BLK_STS_OK); 768 return 0; 769 } 770 771 bio = iblock_get_bio(cmd, block_lba, sgl_nents, opf); 772 if (!bio) 773 goto fail_free_ibr; 774 775 bio_list_init(&list); 776 bio_list_add(&list, bio); 777 778 refcount_set(&ibr->pending, 2); 779 bio_cnt = 1; 780 781 if (cmd->prot_type && dev->dev_attrib.pi_prot_type) 782 sg_miter_start(&prot_miter, cmd->t_prot_sg, cmd->t_prot_nents, 783 miter_dir); 784 785 for_each_sg(sgl, sg, sgl_nents, i) { 786 /* 787 * XXX: if the length the device accepts is shorter than the 788 * length of the S/G list entry this will cause and 789 * endless loop. Better hope no driver uses huge pages. 790 */ 791 while (bio_add_page(bio, sg_page(sg), sg->length, sg->offset) 792 != sg->length) { 793 if (cmd->prot_type && dev->dev_attrib.pi_prot_type) { 794 rc = iblock_alloc_bip(cmd, bio, &prot_miter); 795 if (rc) 796 goto fail_put_bios; 797 } 798 799 if (bio_cnt >= IBLOCK_MAX_BIO_PER_TASK) { 800 iblock_submit_bios(&list); 801 bio_cnt = 0; 802 } 803 804 bio = iblock_get_bio(cmd, block_lba, sg_num, opf); 805 if (!bio) 806 goto fail_put_bios; 807 808 refcount_inc(&ibr->pending); 809 bio_list_add(&list, bio); 810 bio_cnt++; 811 } 812 813 /* Always in 512 byte units for Linux/Block */ 814 block_lba += sg->length >> SECTOR_SHIFT; 815 sg_num--; 816 } 817 818 if (cmd->prot_type && dev->dev_attrib.pi_prot_type) { 819 rc = iblock_alloc_bip(cmd, bio, &prot_miter); 820 if (rc) 821 goto fail_put_bios; 822 } 823 824 iblock_submit_bios(&list); 825 iblock_complete_cmd(cmd, BLK_STS_OK); 826 return 0; 827 828 fail_put_bios: 829 while ((bio = bio_list_pop(&list))) 830 bio_put(bio); 831 fail_free_ibr: 832 kfree(ibr); 833 fail: 834 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 835 } 836 837 static sense_reason_t iblock_execute_pr_out(struct se_cmd *cmd, u8 sa, u64 key, 838 u64 sa_key, u8 type, bool aptpl) 839 { 840 struct se_device *dev = cmd->se_dev; 841 struct iblock_dev *ib_dev = IBLOCK_DEV(dev); 842 struct block_device *bdev = ib_dev->ibd_bd; 843 const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops; 844 int ret; 845 846 if (!ops) { 847 pr_err("Block device does not support pr_ops but iblock device has been configured for PR passthrough.\n"); 848 return TCM_UNSUPPORTED_SCSI_OPCODE; 849 } 850 851 switch (sa) { 852 case PRO_REGISTER: 853 case PRO_REGISTER_AND_IGNORE_EXISTING_KEY: 854 if (!ops->pr_register) { 855 pr_err("block device does not support pr_register.\n"); 856 return TCM_UNSUPPORTED_SCSI_OPCODE; 857 } 858 859 /* The block layer pr ops always enables aptpl */ 860 if (!aptpl) 861 pr_info("APTPL not set by initiator, but will be used.\n"); 862 863 ret = ops->pr_register(bdev, key, sa_key, 864 sa == PRO_REGISTER ? 0 : PR_FL_IGNORE_KEY); 865 break; 866 case PRO_RESERVE: 867 if (!ops->pr_reserve) { 868 pr_err("block_device does not support pr_reserve.\n"); 869 return TCM_UNSUPPORTED_SCSI_OPCODE; 870 } 871 872 ret = ops->pr_reserve(bdev, key, scsi_pr_type_to_block(type), 0); 873 break; 874 case PRO_CLEAR: 875 if (!ops->pr_clear) { 876 pr_err("block_device does not support pr_clear.\n"); 877 return TCM_UNSUPPORTED_SCSI_OPCODE; 878 } 879 880 ret = ops->pr_clear(bdev, key); 881 break; 882 case PRO_PREEMPT: 883 case PRO_PREEMPT_AND_ABORT: 884 if (!ops->pr_clear) { 885 pr_err("block_device does not support pr_preempt.\n"); 886 return TCM_UNSUPPORTED_SCSI_OPCODE; 887 } 888 889 ret = ops->pr_preempt(bdev, key, sa_key, 890 scsi_pr_type_to_block(type), 891 sa == PRO_PREEMPT_AND_ABORT); 892 break; 893 case PRO_RELEASE: 894 if (!ops->pr_clear) { 895 pr_err("block_device does not support pr_pclear.\n"); 896 return TCM_UNSUPPORTED_SCSI_OPCODE; 897 } 898 899 ret = ops->pr_release(bdev, key, scsi_pr_type_to_block(type)); 900 break; 901 default: 902 pr_err("Unknown PERSISTENT_RESERVE_OUT SA: 0x%02x\n", sa); 903 return TCM_UNSUPPORTED_SCSI_OPCODE; 904 } 905 906 if (!ret) 907 return TCM_NO_SENSE; 908 else if (ret == PR_STS_RESERVATION_CONFLICT) 909 return TCM_RESERVATION_CONFLICT; 910 else 911 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 912 } 913 914 static void iblock_pr_report_caps(unsigned char *param_data) 915 { 916 u16 len = 8; 917 918 put_unaligned_be16(len, ¶m_data[0]); 919 /* 920 * When using the pr_ops passthrough method we only support exporting 921 * the device through one target port because from the backend module 922 * level we can't see the target port config. As a result we only 923 * support registration directly from the I_T nexus the cmd is sent 924 * through and do not set ATP_C here. 925 * 926 * The block layer pr_ops do not support passing in initiators so 927 * we don't set SIP_C here. 928 */ 929 /* PTPL_C: Persistence across Target Power Loss bit */ 930 param_data[2] |= 0x01; 931 /* 932 * We are filling in the PERSISTENT RESERVATION TYPE MASK below, so 933 * set the TMV: Task Mask Valid bit. 934 */ 935 param_data[3] |= 0x80; 936 /* 937 * Change ALLOW COMMANDs to 0x20 or 0x40 later from Table 166 938 */ 939 param_data[3] |= 0x10; /* ALLOW COMMANDs field 001b */ 940 /* 941 * PTPL_A: Persistence across Target Power Loss Active bit. The block 942 * layer pr ops always enables this so report it active. 943 */ 944 param_data[3] |= 0x01; 945 /* 946 * Setup the PERSISTENT RESERVATION TYPE MASK from Table 212 spc4r37. 947 */ 948 param_data[4] |= 0x80; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */ 949 param_data[4] |= 0x40; /* PR_TYPE_EXCLUSIVE_ACCESS_REGONLY */ 950 param_data[4] |= 0x20; /* PR_TYPE_WRITE_EXCLUSIVE_REGONLY */ 951 param_data[4] |= 0x08; /* PR_TYPE_EXCLUSIVE_ACCESS */ 952 param_data[4] |= 0x02; /* PR_TYPE_WRITE_EXCLUSIVE */ 953 param_data[5] |= 0x01; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */ 954 } 955 956 static sense_reason_t iblock_pr_read_keys(struct se_cmd *cmd, 957 unsigned char *param_data) 958 { 959 struct se_device *dev = cmd->se_dev; 960 struct iblock_dev *ib_dev = IBLOCK_DEV(dev); 961 struct block_device *bdev = ib_dev->ibd_bd; 962 const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops; 963 int i, len, paths, data_offset; 964 struct pr_keys *keys; 965 sense_reason_t ret; 966 967 if (!ops) { 968 pr_err("Block device does not support pr_ops but iblock device has been configured for PR passthrough.\n"); 969 return TCM_UNSUPPORTED_SCSI_OPCODE; 970 } 971 972 if (!ops->pr_read_keys) { 973 pr_err("Block device does not support read_keys.\n"); 974 return TCM_UNSUPPORTED_SCSI_OPCODE; 975 } 976 977 /* 978 * We don't know what's under us, but dm-multipath will register every 979 * path with the same key, so start off with enough space for 16 paths. 980 * which is not a lot of memory and should normally be enough. 981 */ 982 paths = 16; 983 retry: 984 len = 8 * paths; 985 keys = kzalloc(sizeof(*keys) + len, GFP_KERNEL); 986 if (!keys) 987 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 988 989 keys->num_keys = paths; 990 if (!ops->pr_read_keys(bdev, keys)) { 991 if (keys->num_keys > paths) { 992 kfree(keys); 993 paths *= 2; 994 goto retry; 995 } 996 } else { 997 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 998 goto free_keys; 999 } 1000 1001 ret = TCM_NO_SENSE; 1002 1003 put_unaligned_be32(keys->generation, ¶m_data[0]); 1004 if (!keys->num_keys) { 1005 put_unaligned_be32(0, ¶m_data[4]); 1006 goto free_keys; 1007 } 1008 1009 put_unaligned_be32(8 * keys->num_keys, ¶m_data[4]); 1010 1011 data_offset = 8; 1012 for (i = 0; i < keys->num_keys; i++) { 1013 if (data_offset + 8 > cmd->data_length) 1014 break; 1015 1016 put_unaligned_be64(keys->keys[i], ¶m_data[data_offset]); 1017 data_offset += 8; 1018 } 1019 1020 free_keys: 1021 kfree(keys); 1022 return ret; 1023 } 1024 1025 static sense_reason_t iblock_pr_read_reservation(struct se_cmd *cmd, 1026 unsigned char *param_data) 1027 { 1028 struct se_device *dev = cmd->se_dev; 1029 struct iblock_dev *ib_dev = IBLOCK_DEV(dev); 1030 struct block_device *bdev = ib_dev->ibd_bd; 1031 const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops; 1032 struct pr_held_reservation rsv = { }; 1033 1034 if (!ops) { 1035 pr_err("Block device does not support pr_ops but iblock device has been configured for PR passthrough.\n"); 1036 return TCM_UNSUPPORTED_SCSI_OPCODE; 1037 } 1038 1039 if (!ops->pr_read_reservation) { 1040 pr_err("Block device does not support read_keys.\n"); 1041 return TCM_UNSUPPORTED_SCSI_OPCODE; 1042 } 1043 1044 if (ops->pr_read_reservation(bdev, &rsv)) 1045 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1046 1047 put_unaligned_be32(rsv.generation, ¶m_data[0]); 1048 if (!block_pr_type_to_scsi(rsv.type)) { 1049 put_unaligned_be32(0, ¶m_data[4]); 1050 return TCM_NO_SENSE; 1051 } 1052 1053 put_unaligned_be32(16, ¶m_data[4]); 1054 1055 if (cmd->data_length < 16) 1056 return TCM_NO_SENSE; 1057 put_unaligned_be64(rsv.key, ¶m_data[8]); 1058 1059 if (cmd->data_length < 22) 1060 return TCM_NO_SENSE; 1061 param_data[21] = block_pr_type_to_scsi(rsv.type); 1062 1063 return TCM_NO_SENSE; 1064 } 1065 1066 static sense_reason_t iblock_execute_pr_in(struct se_cmd *cmd, u8 sa, 1067 unsigned char *param_data) 1068 { 1069 sense_reason_t ret = TCM_NO_SENSE; 1070 1071 switch (sa) { 1072 case PRI_REPORT_CAPABILITIES: 1073 iblock_pr_report_caps(param_data); 1074 break; 1075 case PRI_READ_KEYS: 1076 ret = iblock_pr_read_keys(cmd, param_data); 1077 break; 1078 case PRI_READ_RESERVATION: 1079 ret = iblock_pr_read_reservation(cmd, param_data); 1080 break; 1081 default: 1082 pr_err("Unknown PERSISTENT_RESERVE_IN SA: 0x%02x\n", sa); 1083 return TCM_UNSUPPORTED_SCSI_OPCODE; 1084 } 1085 1086 return ret; 1087 } 1088 1089 static sector_t iblock_get_alignment_offset_lbas(struct se_device *dev) 1090 { 1091 struct iblock_dev *ib_dev = IBLOCK_DEV(dev); 1092 struct block_device *bd = ib_dev->ibd_bd; 1093 int ret; 1094 1095 ret = bdev_alignment_offset(bd); 1096 if (ret == -1) 1097 return 0; 1098 1099 /* convert offset-bytes to offset-lbas */ 1100 return ret / bdev_logical_block_size(bd); 1101 } 1102 1103 static unsigned int iblock_get_lbppbe(struct se_device *dev) 1104 { 1105 struct iblock_dev *ib_dev = IBLOCK_DEV(dev); 1106 struct block_device *bd = ib_dev->ibd_bd; 1107 unsigned int logs_per_phys = 1108 bdev_physical_block_size(bd) / bdev_logical_block_size(bd); 1109 1110 return ilog2(logs_per_phys); 1111 } 1112 1113 static unsigned int iblock_get_io_min(struct se_device *dev) 1114 { 1115 struct iblock_dev *ib_dev = IBLOCK_DEV(dev); 1116 struct block_device *bd = ib_dev->ibd_bd; 1117 1118 return bdev_io_min(bd); 1119 } 1120 1121 static unsigned int iblock_get_io_opt(struct se_device *dev) 1122 { 1123 struct iblock_dev *ib_dev = IBLOCK_DEV(dev); 1124 struct block_device *bd = ib_dev->ibd_bd; 1125 1126 return bdev_io_opt(bd); 1127 } 1128 1129 static struct exec_cmd_ops iblock_exec_cmd_ops = { 1130 .execute_rw = iblock_execute_rw, 1131 .execute_sync_cache = iblock_execute_sync_cache, 1132 .execute_write_same = iblock_execute_write_same, 1133 .execute_unmap = iblock_execute_unmap, 1134 .execute_pr_out = iblock_execute_pr_out, 1135 .execute_pr_in = iblock_execute_pr_in, 1136 }; 1137 1138 static sense_reason_t 1139 iblock_parse_cdb(struct se_cmd *cmd) 1140 { 1141 return sbc_parse_cdb(cmd, &iblock_exec_cmd_ops); 1142 } 1143 1144 static bool iblock_get_write_cache(struct se_device *dev) 1145 { 1146 return bdev_write_cache(IBLOCK_DEV(dev)->ibd_bd); 1147 } 1148 1149 static const struct target_backend_ops iblock_ops = { 1150 .name = "iblock", 1151 .inquiry_prod = "IBLOCK", 1152 .transport_flags_changeable = TRANSPORT_FLAG_PASSTHROUGH_PGR, 1153 .inquiry_rev = IBLOCK_VERSION, 1154 .owner = THIS_MODULE, 1155 .attach_hba = iblock_attach_hba, 1156 .detach_hba = iblock_detach_hba, 1157 .alloc_device = iblock_alloc_device, 1158 .configure_device = iblock_configure_device, 1159 .destroy_device = iblock_destroy_device, 1160 .free_device = iblock_free_device, 1161 .configure_unmap = iblock_configure_unmap, 1162 .plug_device = iblock_plug_device, 1163 .unplug_device = iblock_unplug_device, 1164 .parse_cdb = iblock_parse_cdb, 1165 .set_configfs_dev_params = iblock_set_configfs_dev_params, 1166 .show_configfs_dev_params = iblock_show_configfs_dev_params, 1167 .get_device_type = sbc_get_device_type, 1168 .get_blocks = iblock_get_blocks, 1169 .get_alignment_offset_lbas = iblock_get_alignment_offset_lbas, 1170 .get_lbppbe = iblock_get_lbppbe, 1171 .get_io_min = iblock_get_io_min, 1172 .get_io_opt = iblock_get_io_opt, 1173 .get_write_cache = iblock_get_write_cache, 1174 .tb_dev_attrib_attrs = sbc_attrib_attrs, 1175 }; 1176 1177 static int __init iblock_module_init(void) 1178 { 1179 return transport_backend_register(&iblock_ops); 1180 } 1181 1182 static void __exit iblock_module_exit(void) 1183 { 1184 target_backend_unregister(&iblock_ops); 1185 } 1186 1187 MODULE_DESCRIPTION("TCM IBLOCK subsystem plugin"); 1188 MODULE_AUTHOR("nab@Linux-iSCSI.org"); 1189 MODULE_LICENSE("GPL"); 1190 1191 module_init(iblock_module_init); 1192 module_exit(iblock_module_exit); 1193