1 /* 2 * QEMU Block driver for iSCSI images 3 * 4 * Copyright (c) 2010-2011 Ronnie Sahlberg <ronniesahlberg@gmail.com> 5 * Copyright (c) 2012-2014 Peter Lieven <pl@kamp.de> 6 * 7 * Permission is hereby granted, free of charge, to any person obtaining a copy 8 * of this software and associated documentation files (the "Software"), to deal 9 * in the Software without restriction, including without limitation the rights 10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 11 * copies of the Software, and to permit persons to whom the Software is 12 * furnished to do so, subject to the following conditions: 13 * 14 * The above copyright notice and this permission notice shall be included in 15 * all copies or substantial portions of the Software. 16 * 17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 20 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 23 * THE SOFTWARE. 24 */ 25 26 #include "config-host.h" 27 28 #include <poll.h> 29 #include <arpa/inet.h> 30 #include "qemu-common.h" 31 #include "qemu/config-file.h" 32 #include "qemu/error-report.h" 33 #include "qemu/bitops.h" 34 #include "qemu/bitmap.h" 35 #include "block/block_int.h" 36 #include "trace.h" 37 #include "block/scsi.h" 38 #include "qemu/iov.h" 39 #include "sysemu/sysemu.h" 40 #include "qmp-commands.h" 41 42 #include <iscsi/iscsi.h> 43 #include <iscsi/scsi-lowlevel.h> 44 45 #ifdef __linux__ 46 #include <scsi/sg.h> 47 #include <block/scsi.h> 48 #endif 49 50 typedef struct IscsiLun { 51 struct iscsi_context *iscsi; 52 AioContext *aio_context; 53 int lun; 54 enum scsi_inquiry_peripheral_device_type type; 55 int block_size; 56 uint64_t num_blocks; 57 int events; 58 QEMUTimer *nop_timer; 59 uint8_t lbpme; 60 uint8_t lbprz; 61 uint8_t has_write_same; 62 struct scsi_inquiry_logical_block_provisioning lbp; 63 struct scsi_inquiry_block_limits bl; 64 unsigned char *zeroblock; 65 unsigned long *allocationmap; 66 int cluster_sectors; 67 } IscsiLun; 68 69 typedef struct IscsiTask { 70 int status; 71 int complete; 72 int retries; 73 int do_retry; 74 struct scsi_task *task; 75 Coroutine *co; 76 QEMUBH *bh; 77 IscsiLun *iscsilun; 78 } IscsiTask; 79 80 typedef struct IscsiAIOCB { 81 BlockDriverAIOCB common; 82 QEMUIOVector *qiov; 83 QEMUBH *bh; 84 IscsiLun *iscsilun; 85 struct scsi_task *task; 86 uint8_t *buf; 87 int status; 88 int canceled; 89 int retries; 90 int64_t sector_num; 91 int nb_sectors; 92 #ifdef __linux__ 93 sg_io_hdr_t *ioh; 94 #endif 95 } IscsiAIOCB; 96 97 #define NOP_INTERVAL 5000 98 #define MAX_NOP_FAILURES 3 99 #define ISCSI_CMD_RETRIES 5 100 101 /* this threshhold is a trade-off knob to choose between 102 * the potential additional overhead of an extra GET_LBA_STATUS request 103 * vs. unnecessarily reading a lot of zero sectors over the wire. 104 * If a read request is greater or equal than ISCSI_CHECKALLOC_THRES 105 * sectors we check the allocation status of the area covered by the 106 * request first if the allocationmap indicates that the area might be 107 * unallocated. */ 108 #define ISCSI_CHECKALLOC_THRES 64 109 110 static void 111 iscsi_bh_cb(void *p) 112 { 113 IscsiAIOCB *acb = p; 114 115 qemu_bh_delete(acb->bh); 116 117 g_free(acb->buf); 118 acb->buf = NULL; 119 120 if (acb->canceled == 0) { 121 acb->common.cb(acb->common.opaque, acb->status); 122 } 123 124 if (acb->task != NULL) { 125 scsi_free_scsi_task(acb->task); 126 acb->task = NULL; 127 } 128 129 qemu_aio_release(acb); 130 } 131 132 static void 133 iscsi_schedule_bh(IscsiAIOCB *acb) 134 { 135 if (acb->bh) { 136 return; 137 } 138 acb->bh = aio_bh_new(acb->iscsilun->aio_context, iscsi_bh_cb, acb); 139 qemu_bh_schedule(acb->bh); 140 } 141 142 static void iscsi_co_generic_bh_cb(void *opaque) 143 { 144 struct IscsiTask *iTask = opaque; 145 qemu_bh_delete(iTask->bh); 146 qemu_coroutine_enter(iTask->co, NULL); 147 } 148 149 static void 150 iscsi_co_generic_cb(struct iscsi_context *iscsi, int status, 151 void *command_data, void *opaque) 152 { 153 struct IscsiTask *iTask = opaque; 154 struct scsi_task *task = command_data; 155 156 iTask->complete = 1; 157 iTask->status = status; 158 iTask->do_retry = 0; 159 iTask->task = task; 160 161 if (iTask->retries-- > 0 && status == SCSI_STATUS_CHECK_CONDITION 162 && task->sense.key == SCSI_SENSE_UNIT_ATTENTION) { 163 error_report("iSCSI CheckCondition: %s", iscsi_get_error(iscsi)); 164 iTask->do_retry = 1; 165 goto out; 166 } 167 168 if (status != SCSI_STATUS_GOOD) { 169 error_report("iSCSI Failure: %s", iscsi_get_error(iscsi)); 170 } 171 172 out: 173 if (iTask->co) { 174 iTask->bh = aio_bh_new(iTask->iscsilun->aio_context, 175 iscsi_co_generic_bh_cb, iTask); 176 qemu_bh_schedule(iTask->bh); 177 } 178 } 179 180 static void iscsi_co_init_iscsitask(IscsiLun *iscsilun, struct IscsiTask *iTask) 181 { 182 *iTask = (struct IscsiTask) { 183 .co = qemu_coroutine_self(), 184 .retries = ISCSI_CMD_RETRIES, 185 .iscsilun = iscsilun, 186 }; 187 } 188 189 static void 190 iscsi_abort_task_cb(struct iscsi_context *iscsi, int status, void *command_data, 191 void *private_data) 192 { 193 IscsiAIOCB *acb = private_data; 194 195 acb->status = -ECANCELED; 196 iscsi_schedule_bh(acb); 197 } 198 199 static void 200 iscsi_aio_cancel(BlockDriverAIOCB *blockacb) 201 { 202 IscsiAIOCB *acb = (IscsiAIOCB *)blockacb; 203 IscsiLun *iscsilun = acb->iscsilun; 204 205 if (acb->status != -EINPROGRESS) { 206 return; 207 } 208 209 acb->canceled = 1; 210 211 /* send a task mgmt call to the target to cancel the task on the target */ 212 iscsi_task_mgmt_abort_task_async(iscsilun->iscsi, acb->task, 213 iscsi_abort_task_cb, acb); 214 215 while (acb->status == -EINPROGRESS) { 216 aio_poll(iscsilun->aio_context, true); 217 } 218 } 219 220 static const AIOCBInfo iscsi_aiocb_info = { 221 .aiocb_size = sizeof(IscsiAIOCB), 222 .cancel = iscsi_aio_cancel, 223 }; 224 225 226 static void iscsi_process_read(void *arg); 227 static void iscsi_process_write(void *arg); 228 229 static void 230 iscsi_set_events(IscsiLun *iscsilun) 231 { 232 struct iscsi_context *iscsi = iscsilun->iscsi; 233 int ev; 234 235 /* We always register a read handler. */ 236 ev = POLLIN; 237 ev |= iscsi_which_events(iscsi); 238 if (ev != iscsilun->events) { 239 aio_set_fd_handler(iscsilun->aio_context, 240 iscsi_get_fd(iscsi), 241 iscsi_process_read, 242 (ev & POLLOUT) ? iscsi_process_write : NULL, 243 iscsilun); 244 245 } 246 247 iscsilun->events = ev; 248 } 249 250 static void 251 iscsi_process_read(void *arg) 252 { 253 IscsiLun *iscsilun = arg; 254 struct iscsi_context *iscsi = iscsilun->iscsi; 255 256 iscsi_service(iscsi, POLLIN); 257 iscsi_set_events(iscsilun); 258 } 259 260 static void 261 iscsi_process_write(void *arg) 262 { 263 IscsiLun *iscsilun = arg; 264 struct iscsi_context *iscsi = iscsilun->iscsi; 265 266 iscsi_service(iscsi, POLLOUT); 267 iscsi_set_events(iscsilun); 268 } 269 270 static int64_t sector_lun2qemu(int64_t sector, IscsiLun *iscsilun) 271 { 272 return sector * iscsilun->block_size / BDRV_SECTOR_SIZE; 273 } 274 275 static int64_t sector_qemu2lun(int64_t sector, IscsiLun *iscsilun) 276 { 277 return sector * BDRV_SECTOR_SIZE / iscsilun->block_size; 278 } 279 280 static bool is_request_lun_aligned(int64_t sector_num, int nb_sectors, 281 IscsiLun *iscsilun) 282 { 283 if ((sector_num * BDRV_SECTOR_SIZE) % iscsilun->block_size || 284 (nb_sectors * BDRV_SECTOR_SIZE) % iscsilun->block_size) { 285 error_report("iSCSI misaligned request: " 286 "iscsilun->block_size %u, sector_num %" PRIi64 287 ", nb_sectors %d", 288 iscsilun->block_size, sector_num, nb_sectors); 289 return 0; 290 } 291 return 1; 292 } 293 294 static void iscsi_allocationmap_set(IscsiLun *iscsilun, int64_t sector_num, 295 int nb_sectors) 296 { 297 if (iscsilun->allocationmap == NULL) { 298 return; 299 } 300 bitmap_set(iscsilun->allocationmap, 301 sector_num / iscsilun->cluster_sectors, 302 DIV_ROUND_UP(nb_sectors, iscsilun->cluster_sectors)); 303 } 304 305 static void iscsi_allocationmap_clear(IscsiLun *iscsilun, int64_t sector_num, 306 int nb_sectors) 307 { 308 int64_t cluster_num, nb_clusters; 309 if (iscsilun->allocationmap == NULL) { 310 return; 311 } 312 cluster_num = DIV_ROUND_UP(sector_num, iscsilun->cluster_sectors); 313 nb_clusters = (sector_num + nb_sectors) / iscsilun->cluster_sectors 314 - cluster_num; 315 if (nb_clusters > 0) { 316 bitmap_clear(iscsilun->allocationmap, cluster_num, nb_clusters); 317 } 318 } 319 320 static int coroutine_fn iscsi_co_writev(BlockDriverState *bs, 321 int64_t sector_num, int nb_sectors, 322 QEMUIOVector *iov) 323 { 324 IscsiLun *iscsilun = bs->opaque; 325 struct IscsiTask iTask; 326 uint64_t lba; 327 uint32_t num_sectors; 328 uint8_t *data = NULL; 329 uint8_t *buf = NULL; 330 331 if (!is_request_lun_aligned(sector_num, nb_sectors, iscsilun)) { 332 return -EINVAL; 333 } 334 335 lba = sector_qemu2lun(sector_num, iscsilun); 336 num_sectors = sector_qemu2lun(nb_sectors, iscsilun); 337 #if !defined(LIBISCSI_FEATURE_IOVECTOR) 338 /* if the iovec only contains one buffer we can pass it directly */ 339 if (iov->niov == 1) { 340 data = iov->iov[0].iov_base; 341 } else { 342 size_t size = MIN(nb_sectors * BDRV_SECTOR_SIZE, iov->size); 343 buf = g_malloc(size); 344 qemu_iovec_to_buf(iov, 0, buf, size); 345 data = buf; 346 } 347 #endif 348 iscsi_co_init_iscsitask(iscsilun, &iTask); 349 retry: 350 iTask.task = iscsi_write16_task(iscsilun->iscsi, iscsilun->lun, lba, 351 data, num_sectors * iscsilun->block_size, 352 iscsilun->block_size, 0, 0, 0, 0, 0, 353 iscsi_co_generic_cb, &iTask); 354 if (iTask.task == NULL) { 355 g_free(buf); 356 return -ENOMEM; 357 } 358 #if defined(LIBISCSI_FEATURE_IOVECTOR) 359 scsi_task_set_iov_out(iTask.task, (struct scsi_iovec *) iov->iov, 360 iov->niov); 361 #endif 362 while (!iTask.complete) { 363 iscsi_set_events(iscsilun); 364 qemu_coroutine_yield(); 365 } 366 367 if (iTask.task != NULL) { 368 scsi_free_scsi_task(iTask.task); 369 iTask.task = NULL; 370 } 371 372 if (iTask.do_retry) { 373 iTask.complete = 0; 374 goto retry; 375 } 376 377 g_free(buf); 378 379 if (iTask.status != SCSI_STATUS_GOOD) { 380 return -EIO; 381 } 382 383 iscsi_allocationmap_set(iscsilun, sector_num, nb_sectors); 384 385 return 0; 386 } 387 388 389 #if defined(LIBISCSI_FEATURE_IOVECTOR) 390 static bool iscsi_allocationmap_is_allocated(IscsiLun *iscsilun, 391 int64_t sector_num, int nb_sectors) 392 { 393 unsigned long size; 394 if (iscsilun->allocationmap == NULL) { 395 return true; 396 } 397 size = DIV_ROUND_UP(sector_num + nb_sectors, iscsilun->cluster_sectors); 398 return !(find_next_bit(iscsilun->allocationmap, size, 399 sector_num / iscsilun->cluster_sectors) == size); 400 } 401 402 static int64_t coroutine_fn iscsi_co_get_block_status(BlockDriverState *bs, 403 int64_t sector_num, 404 int nb_sectors, int *pnum) 405 { 406 IscsiLun *iscsilun = bs->opaque; 407 struct scsi_get_lba_status *lbas = NULL; 408 struct scsi_lba_status_descriptor *lbasd = NULL; 409 struct IscsiTask iTask; 410 int64_t ret; 411 412 iscsi_co_init_iscsitask(iscsilun, &iTask); 413 414 if (!is_request_lun_aligned(sector_num, nb_sectors, iscsilun)) { 415 ret = -EINVAL; 416 goto out; 417 } 418 419 /* default to all sectors allocated */ 420 ret = BDRV_BLOCK_DATA; 421 ret |= (sector_num << BDRV_SECTOR_BITS) | BDRV_BLOCK_OFFSET_VALID; 422 *pnum = nb_sectors; 423 424 /* LUN does not support logical block provisioning */ 425 if (iscsilun->lbpme == 0) { 426 goto out; 427 } 428 429 retry: 430 if (iscsi_get_lba_status_task(iscsilun->iscsi, iscsilun->lun, 431 sector_qemu2lun(sector_num, iscsilun), 432 8 + 16, iscsi_co_generic_cb, 433 &iTask) == NULL) { 434 ret = -ENOMEM; 435 goto out; 436 } 437 438 while (!iTask.complete) { 439 iscsi_set_events(iscsilun); 440 qemu_coroutine_yield(); 441 } 442 443 if (iTask.do_retry) { 444 if (iTask.task != NULL) { 445 scsi_free_scsi_task(iTask.task); 446 iTask.task = NULL; 447 } 448 iTask.complete = 0; 449 goto retry; 450 } 451 452 if (iTask.status != SCSI_STATUS_GOOD) { 453 /* in case the get_lba_status_callout fails (i.e. 454 * because the device is busy or the cmd is not 455 * supported) we pretend all blocks are allocated 456 * for backwards compatibility */ 457 goto out; 458 } 459 460 lbas = scsi_datain_unmarshall(iTask.task); 461 if (lbas == NULL) { 462 ret = -EIO; 463 goto out; 464 } 465 466 lbasd = &lbas->descriptors[0]; 467 468 if (sector_qemu2lun(sector_num, iscsilun) != lbasd->lba) { 469 ret = -EIO; 470 goto out; 471 } 472 473 *pnum = sector_lun2qemu(lbasd->num_blocks, iscsilun); 474 475 if (lbasd->provisioning == SCSI_PROVISIONING_TYPE_DEALLOCATED || 476 lbasd->provisioning == SCSI_PROVISIONING_TYPE_ANCHORED) { 477 ret &= ~BDRV_BLOCK_DATA; 478 if (iscsilun->lbprz) { 479 ret |= BDRV_BLOCK_ZERO; 480 } 481 } 482 483 if (ret & BDRV_BLOCK_ZERO) { 484 iscsi_allocationmap_clear(iscsilun, sector_num, *pnum); 485 } else { 486 iscsi_allocationmap_set(iscsilun, sector_num, *pnum); 487 } 488 489 if (*pnum > nb_sectors) { 490 *pnum = nb_sectors; 491 } 492 out: 493 if (iTask.task != NULL) { 494 scsi_free_scsi_task(iTask.task); 495 } 496 return ret; 497 } 498 499 #endif /* LIBISCSI_FEATURE_IOVECTOR */ 500 501 502 static int coroutine_fn iscsi_co_readv(BlockDriverState *bs, 503 int64_t sector_num, int nb_sectors, 504 QEMUIOVector *iov) 505 { 506 IscsiLun *iscsilun = bs->opaque; 507 struct IscsiTask iTask; 508 uint64_t lba; 509 uint32_t num_sectors; 510 #if !defined(LIBISCSI_FEATURE_IOVECTOR) 511 int i; 512 #endif 513 514 if (!is_request_lun_aligned(sector_num, nb_sectors, iscsilun)) { 515 return -EINVAL; 516 } 517 518 #if defined(LIBISCSI_FEATURE_IOVECTOR) 519 if (iscsilun->lbprz && nb_sectors >= ISCSI_CHECKALLOC_THRES && 520 !iscsi_allocationmap_is_allocated(iscsilun, sector_num, nb_sectors)) { 521 int64_t ret; 522 int pnum; 523 ret = iscsi_co_get_block_status(bs, sector_num, INT_MAX, &pnum); 524 if (ret < 0) { 525 return ret; 526 } 527 if (ret & BDRV_BLOCK_ZERO && pnum >= nb_sectors) { 528 qemu_iovec_memset(iov, 0, 0x00, iov->size); 529 return 0; 530 } 531 } 532 #endif 533 534 lba = sector_qemu2lun(sector_num, iscsilun); 535 num_sectors = sector_qemu2lun(nb_sectors, iscsilun); 536 537 iscsi_co_init_iscsitask(iscsilun, &iTask); 538 retry: 539 switch (iscsilun->type) { 540 case TYPE_DISK: 541 iTask.task = iscsi_read16_task(iscsilun->iscsi, iscsilun->lun, lba, 542 num_sectors * iscsilun->block_size, 543 iscsilun->block_size, 0, 0, 0, 0, 0, 544 iscsi_co_generic_cb, &iTask); 545 break; 546 default: 547 iTask.task = iscsi_read10_task(iscsilun->iscsi, iscsilun->lun, lba, 548 num_sectors * iscsilun->block_size, 549 iscsilun->block_size, 550 #if !defined(CONFIG_LIBISCSI_1_4) /* API change from 1.4.0 to 1.5.0 */ 551 0, 0, 0, 0, 0, 552 #endif 553 iscsi_co_generic_cb, &iTask); 554 break; 555 } 556 if (iTask.task == NULL) { 557 return -ENOMEM; 558 } 559 #if defined(LIBISCSI_FEATURE_IOVECTOR) 560 scsi_task_set_iov_in(iTask.task, (struct scsi_iovec *) iov->iov, iov->niov); 561 #else 562 for (i = 0; i < iov->niov; i++) { 563 scsi_task_add_data_in_buffer(iTask.task, 564 iov->iov[i].iov_len, 565 iov->iov[i].iov_base); 566 } 567 #endif 568 569 while (!iTask.complete) { 570 iscsi_set_events(iscsilun); 571 qemu_coroutine_yield(); 572 } 573 574 if (iTask.task != NULL) { 575 scsi_free_scsi_task(iTask.task); 576 iTask.task = NULL; 577 } 578 579 if (iTask.do_retry) { 580 iTask.complete = 0; 581 goto retry; 582 } 583 584 if (iTask.status != SCSI_STATUS_GOOD) { 585 return -EIO; 586 } 587 588 return 0; 589 } 590 591 static int coroutine_fn iscsi_co_flush(BlockDriverState *bs) 592 { 593 IscsiLun *iscsilun = bs->opaque; 594 struct IscsiTask iTask; 595 596 if (bs->sg) { 597 return 0; 598 } 599 600 iscsi_co_init_iscsitask(iscsilun, &iTask); 601 602 retry: 603 if (iscsi_synchronizecache10_task(iscsilun->iscsi, iscsilun->lun, 0, 0, 0, 604 0, iscsi_co_generic_cb, &iTask) == NULL) { 605 return -ENOMEM; 606 } 607 608 while (!iTask.complete) { 609 iscsi_set_events(iscsilun); 610 qemu_coroutine_yield(); 611 } 612 613 if (iTask.task != NULL) { 614 scsi_free_scsi_task(iTask.task); 615 iTask.task = NULL; 616 } 617 618 if (iTask.do_retry) { 619 iTask.complete = 0; 620 goto retry; 621 } 622 623 if (iTask.status != SCSI_STATUS_GOOD) { 624 return -EIO; 625 } 626 627 return 0; 628 } 629 630 #ifdef __linux__ 631 static void 632 iscsi_aio_ioctl_cb(struct iscsi_context *iscsi, int status, 633 void *command_data, void *opaque) 634 { 635 IscsiAIOCB *acb = opaque; 636 637 g_free(acb->buf); 638 acb->buf = NULL; 639 640 if (acb->canceled != 0) { 641 return; 642 } 643 644 acb->status = 0; 645 if (status < 0) { 646 error_report("Failed to ioctl(SG_IO) to iSCSI lun. %s", 647 iscsi_get_error(iscsi)); 648 acb->status = -EIO; 649 } 650 651 acb->ioh->driver_status = 0; 652 acb->ioh->host_status = 0; 653 acb->ioh->resid = 0; 654 655 #define SG_ERR_DRIVER_SENSE 0x08 656 657 if (status == SCSI_STATUS_CHECK_CONDITION && acb->task->datain.size >= 2) { 658 int ss; 659 660 acb->ioh->driver_status |= SG_ERR_DRIVER_SENSE; 661 662 acb->ioh->sb_len_wr = acb->task->datain.size - 2; 663 ss = (acb->ioh->mx_sb_len >= acb->ioh->sb_len_wr) ? 664 acb->ioh->mx_sb_len : acb->ioh->sb_len_wr; 665 memcpy(acb->ioh->sbp, &acb->task->datain.data[2], ss); 666 } 667 668 iscsi_schedule_bh(acb); 669 } 670 671 static BlockDriverAIOCB *iscsi_aio_ioctl(BlockDriverState *bs, 672 unsigned long int req, void *buf, 673 BlockDriverCompletionFunc *cb, void *opaque) 674 { 675 IscsiLun *iscsilun = bs->opaque; 676 struct iscsi_context *iscsi = iscsilun->iscsi; 677 struct iscsi_data data; 678 IscsiAIOCB *acb; 679 680 assert(req == SG_IO); 681 682 acb = qemu_aio_get(&iscsi_aiocb_info, bs, cb, opaque); 683 684 acb->iscsilun = iscsilun; 685 acb->canceled = 0; 686 acb->bh = NULL; 687 acb->status = -EINPROGRESS; 688 acb->buf = NULL; 689 acb->ioh = buf; 690 691 acb->task = malloc(sizeof(struct scsi_task)); 692 if (acb->task == NULL) { 693 error_report("iSCSI: Failed to allocate task for scsi command. %s", 694 iscsi_get_error(iscsi)); 695 qemu_aio_release(acb); 696 return NULL; 697 } 698 memset(acb->task, 0, sizeof(struct scsi_task)); 699 700 switch (acb->ioh->dxfer_direction) { 701 case SG_DXFER_TO_DEV: 702 acb->task->xfer_dir = SCSI_XFER_WRITE; 703 break; 704 case SG_DXFER_FROM_DEV: 705 acb->task->xfer_dir = SCSI_XFER_READ; 706 break; 707 default: 708 acb->task->xfer_dir = SCSI_XFER_NONE; 709 break; 710 } 711 712 acb->task->cdb_size = acb->ioh->cmd_len; 713 memcpy(&acb->task->cdb[0], acb->ioh->cmdp, acb->ioh->cmd_len); 714 acb->task->expxferlen = acb->ioh->dxfer_len; 715 716 data.size = 0; 717 if (acb->task->xfer_dir == SCSI_XFER_WRITE) { 718 if (acb->ioh->iovec_count == 0) { 719 data.data = acb->ioh->dxferp; 720 data.size = acb->ioh->dxfer_len; 721 } else { 722 #if defined(LIBISCSI_FEATURE_IOVECTOR) 723 scsi_task_set_iov_out(acb->task, 724 (struct scsi_iovec *) acb->ioh->dxferp, 725 acb->ioh->iovec_count); 726 #else 727 struct iovec *iov = (struct iovec *)acb->ioh->dxferp; 728 729 acb->buf = g_malloc(acb->ioh->dxfer_len); 730 data.data = acb->buf; 731 data.size = iov_to_buf(iov, acb->ioh->iovec_count, 0, 732 acb->buf, acb->ioh->dxfer_len); 733 #endif 734 } 735 } 736 737 if (iscsi_scsi_command_async(iscsi, iscsilun->lun, acb->task, 738 iscsi_aio_ioctl_cb, 739 (data.size > 0) ? &data : NULL, 740 acb) != 0) { 741 scsi_free_scsi_task(acb->task); 742 qemu_aio_release(acb); 743 return NULL; 744 } 745 746 /* tell libiscsi to read straight into the buffer we got from ioctl */ 747 if (acb->task->xfer_dir == SCSI_XFER_READ) { 748 if (acb->ioh->iovec_count == 0) { 749 scsi_task_add_data_in_buffer(acb->task, 750 acb->ioh->dxfer_len, 751 acb->ioh->dxferp); 752 } else { 753 #if defined(LIBISCSI_FEATURE_IOVECTOR) 754 scsi_task_set_iov_in(acb->task, 755 (struct scsi_iovec *) acb->ioh->dxferp, 756 acb->ioh->iovec_count); 757 #else 758 int i; 759 for (i = 0; i < acb->ioh->iovec_count; i++) { 760 struct iovec *iov = (struct iovec *)acb->ioh->dxferp; 761 762 scsi_task_add_data_in_buffer(acb->task, 763 iov[i].iov_len, 764 iov[i].iov_base); 765 } 766 #endif 767 } 768 } 769 770 iscsi_set_events(iscsilun); 771 772 return &acb->common; 773 } 774 775 776 static void ioctl_cb(void *opaque, int status) 777 { 778 int *p_status = opaque; 779 *p_status = status; 780 } 781 782 static int iscsi_ioctl(BlockDriverState *bs, unsigned long int req, void *buf) 783 { 784 IscsiLun *iscsilun = bs->opaque; 785 int status; 786 787 switch (req) { 788 case SG_GET_VERSION_NUM: 789 *(int *)buf = 30000; 790 break; 791 case SG_GET_SCSI_ID: 792 ((struct sg_scsi_id *)buf)->scsi_type = iscsilun->type; 793 break; 794 case SG_IO: 795 status = -EINPROGRESS; 796 iscsi_aio_ioctl(bs, req, buf, ioctl_cb, &status); 797 798 while (status == -EINPROGRESS) { 799 aio_poll(iscsilun->aio_context, true); 800 } 801 802 return 0; 803 default: 804 return -1; 805 } 806 return 0; 807 } 808 #endif 809 810 static int64_t 811 iscsi_getlength(BlockDriverState *bs) 812 { 813 IscsiLun *iscsilun = bs->opaque; 814 int64_t len; 815 816 len = iscsilun->num_blocks; 817 len *= iscsilun->block_size; 818 819 return len; 820 } 821 822 static int 823 coroutine_fn iscsi_co_discard(BlockDriverState *bs, int64_t sector_num, 824 int nb_sectors) 825 { 826 IscsiLun *iscsilun = bs->opaque; 827 struct IscsiTask iTask; 828 struct unmap_list list; 829 830 if (!is_request_lun_aligned(sector_num, nb_sectors, iscsilun)) { 831 return -EINVAL; 832 } 833 834 if (!iscsilun->lbp.lbpu) { 835 /* UNMAP is not supported by the target */ 836 return 0; 837 } 838 839 list.lba = sector_qemu2lun(sector_num, iscsilun); 840 list.num = sector_qemu2lun(nb_sectors, iscsilun); 841 842 iscsi_co_init_iscsitask(iscsilun, &iTask); 843 retry: 844 if (iscsi_unmap_task(iscsilun->iscsi, iscsilun->lun, 0, 0, &list, 1, 845 iscsi_co_generic_cb, &iTask) == NULL) { 846 return -ENOMEM; 847 } 848 849 while (!iTask.complete) { 850 iscsi_set_events(iscsilun); 851 qemu_coroutine_yield(); 852 } 853 854 if (iTask.task != NULL) { 855 scsi_free_scsi_task(iTask.task); 856 iTask.task = NULL; 857 } 858 859 if (iTask.do_retry) { 860 iTask.complete = 0; 861 goto retry; 862 } 863 864 if (iTask.status == SCSI_STATUS_CHECK_CONDITION) { 865 /* the target might fail with a check condition if it 866 is not happy with the alignment of the UNMAP request 867 we silently fail in this case */ 868 return 0; 869 } 870 871 if (iTask.status != SCSI_STATUS_GOOD) { 872 return -EIO; 873 } 874 875 iscsi_allocationmap_clear(iscsilun, sector_num, nb_sectors); 876 877 return 0; 878 } 879 880 #if defined(SCSI_SENSE_ASCQ_CAPACITY_DATA_HAS_CHANGED) 881 882 static int 883 coroutine_fn iscsi_co_write_zeroes(BlockDriverState *bs, int64_t sector_num, 884 int nb_sectors, BdrvRequestFlags flags) 885 { 886 IscsiLun *iscsilun = bs->opaque; 887 struct IscsiTask iTask; 888 uint64_t lba; 889 uint32_t nb_blocks; 890 891 if (!is_request_lun_aligned(sector_num, nb_sectors, iscsilun)) { 892 return -EINVAL; 893 } 894 895 if ((flags & BDRV_REQ_MAY_UNMAP) && !iscsilun->lbp.lbpws) { 896 /* WRITE SAME with UNMAP is not supported by the target, 897 * fall back and try WRITE SAME without UNMAP */ 898 flags &= ~BDRV_REQ_MAY_UNMAP; 899 } 900 901 if (!(flags & BDRV_REQ_MAY_UNMAP) && !iscsilun->has_write_same) { 902 /* WRITE SAME without UNMAP is not supported by the target */ 903 return -ENOTSUP; 904 } 905 906 lba = sector_qemu2lun(sector_num, iscsilun); 907 nb_blocks = sector_qemu2lun(nb_sectors, iscsilun); 908 909 if (iscsilun->zeroblock == NULL) { 910 iscsilun->zeroblock = g_malloc0(iscsilun->block_size); 911 } 912 913 iscsi_co_init_iscsitask(iscsilun, &iTask); 914 retry: 915 if (iscsi_writesame16_task(iscsilun->iscsi, iscsilun->lun, lba, 916 iscsilun->zeroblock, iscsilun->block_size, 917 nb_blocks, 0, !!(flags & BDRV_REQ_MAY_UNMAP), 918 0, 0, iscsi_co_generic_cb, &iTask) == NULL) { 919 return -ENOMEM; 920 } 921 922 while (!iTask.complete) { 923 iscsi_set_events(iscsilun); 924 qemu_coroutine_yield(); 925 } 926 927 if (iTask.status == SCSI_STATUS_CHECK_CONDITION && 928 iTask.task->sense.key == SCSI_SENSE_ILLEGAL_REQUEST && 929 (iTask.task->sense.ascq == SCSI_SENSE_ASCQ_INVALID_OPERATION_CODE || 930 iTask.task->sense.ascq == SCSI_SENSE_ASCQ_INVALID_FIELD_IN_CDB)) { 931 /* WRITE SAME is not supported by the target */ 932 iscsilun->has_write_same = false; 933 scsi_free_scsi_task(iTask.task); 934 return -ENOTSUP; 935 } 936 937 if (iTask.task != NULL) { 938 scsi_free_scsi_task(iTask.task); 939 iTask.task = NULL; 940 } 941 942 if (iTask.do_retry) { 943 iTask.complete = 0; 944 goto retry; 945 } 946 947 if (iTask.status != SCSI_STATUS_GOOD) { 948 return -EIO; 949 } 950 951 if (flags & BDRV_REQ_MAY_UNMAP) { 952 iscsi_allocationmap_clear(iscsilun, sector_num, nb_sectors); 953 } else { 954 iscsi_allocationmap_set(iscsilun, sector_num, nb_sectors); 955 } 956 957 return 0; 958 } 959 960 #endif /* SCSI_SENSE_ASCQ_CAPACITY_DATA_HAS_CHANGED */ 961 962 static void parse_chap(struct iscsi_context *iscsi, const char *target, 963 Error **errp) 964 { 965 QemuOptsList *list; 966 QemuOpts *opts; 967 const char *user = NULL; 968 const char *password = NULL; 969 970 list = qemu_find_opts("iscsi"); 971 if (!list) { 972 return; 973 } 974 975 opts = qemu_opts_find(list, target); 976 if (opts == NULL) { 977 opts = QTAILQ_FIRST(&list->head); 978 if (!opts) { 979 return; 980 } 981 } 982 983 user = qemu_opt_get(opts, "user"); 984 if (!user) { 985 return; 986 } 987 988 password = qemu_opt_get(opts, "password"); 989 if (!password) { 990 error_setg(errp, "CHAP username specified but no password was given"); 991 return; 992 } 993 994 if (iscsi_set_initiator_username_pwd(iscsi, user, password)) { 995 error_setg(errp, "Failed to set initiator username and password"); 996 } 997 } 998 999 static void parse_header_digest(struct iscsi_context *iscsi, const char *target, 1000 Error **errp) 1001 { 1002 QemuOptsList *list; 1003 QemuOpts *opts; 1004 const char *digest = NULL; 1005 1006 list = qemu_find_opts("iscsi"); 1007 if (!list) { 1008 return; 1009 } 1010 1011 opts = qemu_opts_find(list, target); 1012 if (opts == NULL) { 1013 opts = QTAILQ_FIRST(&list->head); 1014 if (!opts) { 1015 return; 1016 } 1017 } 1018 1019 digest = qemu_opt_get(opts, "header-digest"); 1020 if (!digest) { 1021 return; 1022 } 1023 1024 if (!strcmp(digest, "CRC32C")) { 1025 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_CRC32C); 1026 } else if (!strcmp(digest, "NONE")) { 1027 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE); 1028 } else if (!strcmp(digest, "CRC32C-NONE")) { 1029 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_CRC32C_NONE); 1030 } else if (!strcmp(digest, "NONE-CRC32C")) { 1031 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE_CRC32C); 1032 } else { 1033 error_setg(errp, "Invalid header-digest setting : %s", digest); 1034 } 1035 } 1036 1037 static char *parse_initiator_name(const char *target) 1038 { 1039 QemuOptsList *list; 1040 QemuOpts *opts; 1041 const char *name; 1042 char *iscsi_name; 1043 UuidInfo *uuid_info; 1044 1045 list = qemu_find_opts("iscsi"); 1046 if (list) { 1047 opts = qemu_opts_find(list, target); 1048 if (!opts) { 1049 opts = QTAILQ_FIRST(&list->head); 1050 } 1051 if (opts) { 1052 name = qemu_opt_get(opts, "initiator-name"); 1053 if (name) { 1054 return g_strdup(name); 1055 } 1056 } 1057 } 1058 1059 uuid_info = qmp_query_uuid(NULL); 1060 if (strcmp(uuid_info->UUID, UUID_NONE) == 0) { 1061 name = qemu_get_vm_name(); 1062 } else { 1063 name = uuid_info->UUID; 1064 } 1065 iscsi_name = g_strdup_printf("iqn.2008-11.org.linux-kvm%s%s", 1066 name ? ":" : "", name ? name : ""); 1067 qapi_free_UuidInfo(uuid_info); 1068 return iscsi_name; 1069 } 1070 1071 #if defined(LIBISCSI_FEATURE_NOP_COUNTER) 1072 static void iscsi_nop_timed_event(void *opaque) 1073 { 1074 IscsiLun *iscsilun = opaque; 1075 1076 if (iscsi_get_nops_in_flight(iscsilun->iscsi) > MAX_NOP_FAILURES) { 1077 error_report("iSCSI: NOP timeout. Reconnecting..."); 1078 iscsi_reconnect(iscsilun->iscsi); 1079 } 1080 1081 if (iscsi_nop_out_async(iscsilun->iscsi, NULL, NULL, 0, NULL) != 0) { 1082 error_report("iSCSI: failed to sent NOP-Out. Disabling NOP messages."); 1083 return; 1084 } 1085 1086 timer_mod(iscsilun->nop_timer, qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + NOP_INTERVAL); 1087 iscsi_set_events(iscsilun); 1088 } 1089 #endif 1090 1091 static void iscsi_readcapacity_sync(IscsiLun *iscsilun, Error **errp) 1092 { 1093 struct scsi_task *task = NULL; 1094 struct scsi_readcapacity10 *rc10 = NULL; 1095 struct scsi_readcapacity16 *rc16 = NULL; 1096 int retries = ISCSI_CMD_RETRIES; 1097 1098 do { 1099 if (task != NULL) { 1100 scsi_free_scsi_task(task); 1101 task = NULL; 1102 } 1103 1104 switch (iscsilun->type) { 1105 case TYPE_DISK: 1106 task = iscsi_readcapacity16_sync(iscsilun->iscsi, iscsilun->lun); 1107 if (task != NULL && task->status == SCSI_STATUS_GOOD) { 1108 rc16 = scsi_datain_unmarshall(task); 1109 if (rc16 == NULL) { 1110 error_setg(errp, "iSCSI: Failed to unmarshall readcapacity16 data."); 1111 } else { 1112 iscsilun->block_size = rc16->block_length; 1113 iscsilun->num_blocks = rc16->returned_lba + 1; 1114 iscsilun->lbpme = rc16->lbpme; 1115 iscsilun->lbprz = rc16->lbprz; 1116 } 1117 } 1118 break; 1119 case TYPE_ROM: 1120 task = iscsi_readcapacity10_sync(iscsilun->iscsi, iscsilun->lun, 0, 0); 1121 if (task != NULL && task->status == SCSI_STATUS_GOOD) { 1122 rc10 = scsi_datain_unmarshall(task); 1123 if (rc10 == NULL) { 1124 error_setg(errp, "iSCSI: Failed to unmarshall readcapacity10 data."); 1125 } else { 1126 iscsilun->block_size = rc10->block_size; 1127 if (rc10->lba == 0) { 1128 /* blank disk loaded */ 1129 iscsilun->num_blocks = 0; 1130 } else { 1131 iscsilun->num_blocks = rc10->lba + 1; 1132 } 1133 } 1134 } 1135 break; 1136 default: 1137 return; 1138 } 1139 } while (task != NULL && task->status == SCSI_STATUS_CHECK_CONDITION 1140 && task->sense.key == SCSI_SENSE_UNIT_ATTENTION 1141 && retries-- > 0); 1142 1143 if (task == NULL || task->status != SCSI_STATUS_GOOD) { 1144 error_setg(errp, "iSCSI: failed to send readcapacity10 command."); 1145 } 1146 if (task) { 1147 scsi_free_scsi_task(task); 1148 } 1149 } 1150 1151 /* TODO Convert to fine grained options */ 1152 static QemuOptsList runtime_opts = { 1153 .name = "iscsi", 1154 .head = QTAILQ_HEAD_INITIALIZER(runtime_opts.head), 1155 .desc = { 1156 { 1157 .name = "filename", 1158 .type = QEMU_OPT_STRING, 1159 .help = "URL to the iscsi image", 1160 }, 1161 { /* end of list */ } 1162 }, 1163 }; 1164 1165 static struct scsi_task *iscsi_do_inquiry(struct iscsi_context *iscsi, int lun, 1166 int evpd, int pc, void **inq, Error **errp) 1167 { 1168 int full_size; 1169 struct scsi_task *task = NULL; 1170 task = iscsi_inquiry_sync(iscsi, lun, evpd, pc, 64); 1171 if (task == NULL || task->status != SCSI_STATUS_GOOD) { 1172 goto fail; 1173 } 1174 full_size = scsi_datain_getfullsize(task); 1175 if (full_size > task->datain.size) { 1176 scsi_free_scsi_task(task); 1177 1178 /* we need more data for the full list */ 1179 task = iscsi_inquiry_sync(iscsi, lun, evpd, pc, full_size); 1180 if (task == NULL || task->status != SCSI_STATUS_GOOD) { 1181 goto fail; 1182 } 1183 } 1184 1185 *inq = scsi_datain_unmarshall(task); 1186 if (*inq == NULL) { 1187 error_setg(errp, "iSCSI: failed to unmarshall inquiry datain blob"); 1188 goto fail_with_err; 1189 } 1190 1191 return task; 1192 1193 fail: 1194 error_setg(errp, "iSCSI: Inquiry command failed : %s", 1195 iscsi_get_error(iscsi)); 1196 fail_with_err: 1197 if (task != NULL) { 1198 scsi_free_scsi_task(task); 1199 } 1200 return NULL; 1201 } 1202 1203 static void iscsi_detach_aio_context(BlockDriverState *bs) 1204 { 1205 IscsiLun *iscsilun = bs->opaque; 1206 1207 aio_set_fd_handler(iscsilun->aio_context, 1208 iscsi_get_fd(iscsilun->iscsi), 1209 NULL, NULL, NULL); 1210 iscsilun->events = 0; 1211 1212 if (iscsilun->nop_timer) { 1213 timer_del(iscsilun->nop_timer); 1214 timer_free(iscsilun->nop_timer); 1215 iscsilun->nop_timer = NULL; 1216 } 1217 } 1218 1219 static void iscsi_attach_aio_context(BlockDriverState *bs, 1220 AioContext *new_context) 1221 { 1222 IscsiLun *iscsilun = bs->opaque; 1223 1224 iscsilun->aio_context = new_context; 1225 iscsi_set_events(iscsilun); 1226 1227 #if defined(LIBISCSI_FEATURE_NOP_COUNTER) 1228 /* Set up a timer for sending out iSCSI NOPs */ 1229 iscsilun->nop_timer = aio_timer_new(iscsilun->aio_context, 1230 QEMU_CLOCK_REALTIME, SCALE_MS, 1231 iscsi_nop_timed_event, iscsilun); 1232 timer_mod(iscsilun->nop_timer, 1233 qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + NOP_INTERVAL); 1234 #endif 1235 } 1236 1237 /* 1238 * We support iscsi url's on the form 1239 * iscsi://[<username>%<password>@]<host>[:<port>]/<targetname>/<lun> 1240 * 1241 * Note: flags are currently not used by iscsi_open. If this function 1242 * is changed such that flags are used, please examine iscsi_reopen_prepare() 1243 * to see if needs to be changed as well. 1244 */ 1245 static int iscsi_open(BlockDriverState *bs, QDict *options, int flags, 1246 Error **errp) 1247 { 1248 IscsiLun *iscsilun = bs->opaque; 1249 struct iscsi_context *iscsi = NULL; 1250 struct iscsi_url *iscsi_url = NULL; 1251 struct scsi_task *task = NULL; 1252 struct scsi_inquiry_standard *inq = NULL; 1253 struct scsi_inquiry_supported_pages *inq_vpd; 1254 char *initiator_name = NULL; 1255 QemuOpts *opts; 1256 Error *local_err = NULL; 1257 const char *filename; 1258 int i, ret; 1259 1260 if ((BDRV_SECTOR_SIZE % 512) != 0) { 1261 error_setg(errp, "iSCSI: Invalid BDRV_SECTOR_SIZE. " 1262 "BDRV_SECTOR_SIZE(%lld) is not a multiple " 1263 "of 512", BDRV_SECTOR_SIZE); 1264 return -EINVAL; 1265 } 1266 1267 opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort); 1268 qemu_opts_absorb_qdict(opts, options, &local_err); 1269 if (local_err) { 1270 error_propagate(errp, local_err); 1271 ret = -EINVAL; 1272 goto out; 1273 } 1274 1275 filename = qemu_opt_get(opts, "filename"); 1276 1277 iscsi_url = iscsi_parse_full_url(iscsi, filename); 1278 if (iscsi_url == NULL) { 1279 error_setg(errp, "Failed to parse URL : %s", filename); 1280 ret = -EINVAL; 1281 goto out; 1282 } 1283 1284 memset(iscsilun, 0, sizeof(IscsiLun)); 1285 1286 initiator_name = parse_initiator_name(iscsi_url->target); 1287 1288 iscsi = iscsi_create_context(initiator_name); 1289 if (iscsi == NULL) { 1290 error_setg(errp, "iSCSI: Failed to create iSCSI context."); 1291 ret = -ENOMEM; 1292 goto out; 1293 } 1294 1295 if (iscsi_set_targetname(iscsi, iscsi_url->target)) { 1296 error_setg(errp, "iSCSI: Failed to set target name."); 1297 ret = -EINVAL; 1298 goto out; 1299 } 1300 1301 if (iscsi_url->user != NULL) { 1302 ret = iscsi_set_initiator_username_pwd(iscsi, iscsi_url->user, 1303 iscsi_url->passwd); 1304 if (ret != 0) { 1305 error_setg(errp, "Failed to set initiator username and password"); 1306 ret = -EINVAL; 1307 goto out; 1308 } 1309 } 1310 1311 /* check if we got CHAP username/password via the options */ 1312 parse_chap(iscsi, iscsi_url->target, &local_err); 1313 if (local_err != NULL) { 1314 error_propagate(errp, local_err); 1315 ret = -EINVAL; 1316 goto out; 1317 } 1318 1319 if (iscsi_set_session_type(iscsi, ISCSI_SESSION_NORMAL) != 0) { 1320 error_setg(errp, "iSCSI: Failed to set session type to normal."); 1321 ret = -EINVAL; 1322 goto out; 1323 } 1324 1325 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE_CRC32C); 1326 1327 /* check if we got HEADER_DIGEST via the options */ 1328 parse_header_digest(iscsi, iscsi_url->target, &local_err); 1329 if (local_err != NULL) { 1330 error_propagate(errp, local_err); 1331 ret = -EINVAL; 1332 goto out; 1333 } 1334 1335 if (iscsi_full_connect_sync(iscsi, iscsi_url->portal, iscsi_url->lun) != 0) { 1336 error_setg(errp, "iSCSI: Failed to connect to LUN : %s", 1337 iscsi_get_error(iscsi)); 1338 ret = -EINVAL; 1339 goto out; 1340 } 1341 1342 iscsilun->iscsi = iscsi; 1343 iscsilun->aio_context = bdrv_get_aio_context(bs); 1344 iscsilun->lun = iscsi_url->lun; 1345 iscsilun->has_write_same = true; 1346 1347 task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 0, 0, 1348 (void **) &inq, errp); 1349 if (task == NULL) { 1350 ret = -EINVAL; 1351 goto out; 1352 } 1353 iscsilun->type = inq->periperal_device_type; 1354 scsi_free_scsi_task(task); 1355 task = NULL; 1356 1357 iscsi_readcapacity_sync(iscsilun, &local_err); 1358 if (local_err != NULL) { 1359 error_propagate(errp, local_err); 1360 ret = -EINVAL; 1361 goto out; 1362 } 1363 bs->total_sectors = sector_lun2qemu(iscsilun->num_blocks, iscsilun); 1364 bs->request_alignment = iscsilun->block_size; 1365 1366 /* We don't have any emulation for devices other than disks and CD-ROMs, so 1367 * this must be sg ioctl compatible. We force it to be sg, otherwise qemu 1368 * will try to read from the device to guess the image format. 1369 */ 1370 if (iscsilun->type != TYPE_DISK && iscsilun->type != TYPE_ROM) { 1371 bs->sg = 1; 1372 } 1373 1374 task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1, 1375 SCSI_INQUIRY_PAGECODE_SUPPORTED_VPD_PAGES, 1376 (void **) &inq_vpd, errp); 1377 if (task == NULL) { 1378 ret = -EINVAL; 1379 goto out; 1380 } 1381 for (i = 0; i < inq_vpd->num_pages; i++) { 1382 struct scsi_task *inq_task; 1383 struct scsi_inquiry_logical_block_provisioning *inq_lbp; 1384 struct scsi_inquiry_block_limits *inq_bl; 1385 switch (inq_vpd->pages[i]) { 1386 case SCSI_INQUIRY_PAGECODE_LOGICAL_BLOCK_PROVISIONING: 1387 inq_task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1, 1388 SCSI_INQUIRY_PAGECODE_LOGICAL_BLOCK_PROVISIONING, 1389 (void **) &inq_lbp, errp); 1390 if (inq_task == NULL) { 1391 ret = -EINVAL; 1392 goto out; 1393 } 1394 memcpy(&iscsilun->lbp, inq_lbp, 1395 sizeof(struct scsi_inquiry_logical_block_provisioning)); 1396 scsi_free_scsi_task(inq_task); 1397 break; 1398 case SCSI_INQUIRY_PAGECODE_BLOCK_LIMITS: 1399 inq_task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1, 1400 SCSI_INQUIRY_PAGECODE_BLOCK_LIMITS, 1401 (void **) &inq_bl, errp); 1402 if (inq_task == NULL) { 1403 ret = -EINVAL; 1404 goto out; 1405 } 1406 memcpy(&iscsilun->bl, inq_bl, 1407 sizeof(struct scsi_inquiry_block_limits)); 1408 scsi_free_scsi_task(inq_task); 1409 break; 1410 default: 1411 break; 1412 } 1413 } 1414 scsi_free_scsi_task(task); 1415 task = NULL; 1416 1417 iscsi_attach_aio_context(bs, iscsilun->aio_context); 1418 1419 /* Guess the internal cluster (page) size of the iscsi target by the means 1420 * of opt_unmap_gran. Transfer the unmap granularity only if it has a 1421 * reasonable size */ 1422 if (iscsilun->bl.opt_unmap_gran * iscsilun->block_size >= 4 * 1024 && 1423 iscsilun->bl.opt_unmap_gran * iscsilun->block_size <= 16 * 1024 * 1024) { 1424 iscsilun->cluster_sectors = (iscsilun->bl.opt_unmap_gran * 1425 iscsilun->block_size) >> BDRV_SECTOR_BITS; 1426 #if defined(LIBISCSI_FEATURE_IOVECTOR) 1427 if (iscsilun->lbprz && !(bs->open_flags & BDRV_O_NOCACHE)) { 1428 iscsilun->allocationmap = 1429 bitmap_new(DIV_ROUND_UP(bs->total_sectors, 1430 iscsilun->cluster_sectors)); 1431 } 1432 #endif 1433 } 1434 1435 out: 1436 qemu_opts_del(opts); 1437 if (initiator_name != NULL) { 1438 g_free(initiator_name); 1439 } 1440 if (iscsi_url != NULL) { 1441 iscsi_destroy_url(iscsi_url); 1442 } 1443 if (task != NULL) { 1444 scsi_free_scsi_task(task); 1445 } 1446 1447 if (ret) { 1448 if (iscsi != NULL) { 1449 iscsi_destroy_context(iscsi); 1450 } 1451 memset(iscsilun, 0, sizeof(IscsiLun)); 1452 } 1453 return ret; 1454 } 1455 1456 static void iscsi_close(BlockDriverState *bs) 1457 { 1458 IscsiLun *iscsilun = bs->opaque; 1459 struct iscsi_context *iscsi = iscsilun->iscsi; 1460 1461 iscsi_detach_aio_context(bs); 1462 iscsi_destroy_context(iscsi); 1463 g_free(iscsilun->zeroblock); 1464 g_free(iscsilun->allocationmap); 1465 memset(iscsilun, 0, sizeof(IscsiLun)); 1466 } 1467 1468 static int iscsi_refresh_limits(BlockDriverState *bs) 1469 { 1470 IscsiLun *iscsilun = bs->opaque; 1471 1472 /* We don't actually refresh here, but just return data queried in 1473 * iscsi_open(): iscsi targets don't change their limits. */ 1474 if (iscsilun->lbp.lbpu) { 1475 if (iscsilun->bl.max_unmap < 0xffffffff) { 1476 bs->bl.max_discard = sector_lun2qemu(iscsilun->bl.max_unmap, 1477 iscsilun); 1478 } 1479 bs->bl.discard_alignment = sector_lun2qemu(iscsilun->bl.opt_unmap_gran, 1480 iscsilun); 1481 } 1482 1483 if (iscsilun->bl.max_ws_len < 0xffffffff) { 1484 bs->bl.max_write_zeroes = sector_lun2qemu(iscsilun->bl.max_ws_len, 1485 iscsilun); 1486 } 1487 if (iscsilun->lbp.lbpws) { 1488 bs->bl.write_zeroes_alignment = sector_lun2qemu(iscsilun->bl.opt_unmap_gran, 1489 iscsilun); 1490 } 1491 bs->bl.opt_transfer_length = sector_lun2qemu(iscsilun->bl.opt_xfer_len, 1492 iscsilun); 1493 return 0; 1494 } 1495 1496 /* Since iscsi_open() ignores bdrv_flags, there is nothing to do here in 1497 * prepare. Note that this will not re-establish a connection with an iSCSI 1498 * target - it is effectively a NOP. */ 1499 static int iscsi_reopen_prepare(BDRVReopenState *state, 1500 BlockReopenQueue *queue, Error **errp) 1501 { 1502 /* NOP */ 1503 return 0; 1504 } 1505 1506 static int iscsi_truncate(BlockDriverState *bs, int64_t offset) 1507 { 1508 IscsiLun *iscsilun = bs->opaque; 1509 Error *local_err = NULL; 1510 1511 if (iscsilun->type != TYPE_DISK) { 1512 return -ENOTSUP; 1513 } 1514 1515 iscsi_readcapacity_sync(iscsilun, &local_err); 1516 if (local_err != NULL) { 1517 error_free(local_err); 1518 return -EIO; 1519 } 1520 1521 if (offset > iscsi_getlength(bs)) { 1522 return -EINVAL; 1523 } 1524 1525 if (iscsilun->allocationmap != NULL) { 1526 g_free(iscsilun->allocationmap); 1527 iscsilun->allocationmap = 1528 bitmap_new(DIV_ROUND_UP(bs->total_sectors, 1529 iscsilun->cluster_sectors)); 1530 } 1531 1532 return 0; 1533 } 1534 1535 static int iscsi_create(const char *filename, QEMUOptionParameter *options, 1536 Error **errp) 1537 { 1538 int ret = 0; 1539 int64_t total_size = 0; 1540 BlockDriverState *bs; 1541 IscsiLun *iscsilun = NULL; 1542 QDict *bs_options; 1543 1544 bs = bdrv_new("", &error_abort); 1545 1546 /* Read out options */ 1547 while (options && options->name) { 1548 if (!strcmp(options->name, "size")) { 1549 total_size = options->value.n / BDRV_SECTOR_SIZE; 1550 } 1551 options++; 1552 } 1553 1554 bs->opaque = g_malloc0(sizeof(struct IscsiLun)); 1555 iscsilun = bs->opaque; 1556 1557 bs_options = qdict_new(); 1558 qdict_put(bs_options, "filename", qstring_from_str(filename)); 1559 ret = iscsi_open(bs, bs_options, 0, NULL); 1560 QDECREF(bs_options); 1561 1562 if (ret != 0) { 1563 goto out; 1564 } 1565 iscsi_detach_aio_context(bs); 1566 if (iscsilun->type != TYPE_DISK) { 1567 ret = -ENODEV; 1568 goto out; 1569 } 1570 if (bs->total_sectors < total_size) { 1571 ret = -ENOSPC; 1572 goto out; 1573 } 1574 1575 ret = 0; 1576 out: 1577 if (iscsilun->iscsi != NULL) { 1578 iscsi_destroy_context(iscsilun->iscsi); 1579 } 1580 g_free(bs->opaque); 1581 bs->opaque = NULL; 1582 bdrv_unref(bs); 1583 return ret; 1584 } 1585 1586 static int iscsi_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) 1587 { 1588 IscsiLun *iscsilun = bs->opaque; 1589 bdi->unallocated_blocks_are_zero = !!iscsilun->lbprz; 1590 bdi->can_write_zeroes_with_unmap = iscsilun->lbprz && iscsilun->lbp.lbpws; 1591 bdi->cluster_size = iscsilun->cluster_sectors * BDRV_SECTOR_SIZE; 1592 return 0; 1593 } 1594 1595 static QEMUOptionParameter iscsi_create_options[] = { 1596 { 1597 .name = BLOCK_OPT_SIZE, 1598 .type = OPT_SIZE, 1599 .help = "Virtual disk size" 1600 }, 1601 { NULL } 1602 }; 1603 1604 static BlockDriver bdrv_iscsi = { 1605 .format_name = "iscsi", 1606 .protocol_name = "iscsi", 1607 1608 .instance_size = sizeof(IscsiLun), 1609 .bdrv_needs_filename = true, 1610 .bdrv_file_open = iscsi_open, 1611 .bdrv_close = iscsi_close, 1612 .bdrv_create = iscsi_create, 1613 .create_options = iscsi_create_options, 1614 .bdrv_reopen_prepare = iscsi_reopen_prepare, 1615 1616 .bdrv_getlength = iscsi_getlength, 1617 .bdrv_get_info = iscsi_get_info, 1618 .bdrv_truncate = iscsi_truncate, 1619 .bdrv_refresh_limits = iscsi_refresh_limits, 1620 1621 #if defined(LIBISCSI_FEATURE_IOVECTOR) 1622 .bdrv_co_get_block_status = iscsi_co_get_block_status, 1623 #endif 1624 .bdrv_co_discard = iscsi_co_discard, 1625 #if defined(SCSI_SENSE_ASCQ_CAPACITY_DATA_HAS_CHANGED) 1626 .bdrv_co_write_zeroes = iscsi_co_write_zeroes, 1627 #endif 1628 .bdrv_co_readv = iscsi_co_readv, 1629 .bdrv_co_writev = iscsi_co_writev, 1630 .bdrv_co_flush_to_disk = iscsi_co_flush, 1631 1632 #ifdef __linux__ 1633 .bdrv_ioctl = iscsi_ioctl, 1634 .bdrv_aio_ioctl = iscsi_aio_ioctl, 1635 #endif 1636 1637 .bdrv_detach_aio_context = iscsi_detach_aio_context, 1638 .bdrv_attach_aio_context = iscsi_attach_aio_context, 1639 }; 1640 1641 static QemuOptsList qemu_iscsi_opts = { 1642 .name = "iscsi", 1643 .head = QTAILQ_HEAD_INITIALIZER(qemu_iscsi_opts.head), 1644 .desc = { 1645 { 1646 .name = "user", 1647 .type = QEMU_OPT_STRING, 1648 .help = "username for CHAP authentication to target", 1649 },{ 1650 .name = "password", 1651 .type = QEMU_OPT_STRING, 1652 .help = "password for CHAP authentication to target", 1653 },{ 1654 .name = "header-digest", 1655 .type = QEMU_OPT_STRING, 1656 .help = "HeaderDigest setting. " 1657 "{CRC32C|CRC32C-NONE|NONE-CRC32C|NONE}", 1658 },{ 1659 .name = "initiator-name", 1660 .type = QEMU_OPT_STRING, 1661 .help = "Initiator iqn name to use when connecting", 1662 }, 1663 { /* end of list */ } 1664 }, 1665 }; 1666 1667 static void iscsi_block_init(void) 1668 { 1669 bdrv_register(&bdrv_iscsi); 1670 qemu_add_opts(&qemu_iscsi_opts); 1671 } 1672 1673 block_init(iscsi_block_init); 1674