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 <math.h> 30 #include <arpa/inet.h> 31 #include "qemu-common.h" 32 #include "qemu/config-file.h" 33 #include "qemu/error-report.h" 34 #include "qemu/bitops.h" 35 #include "qemu/bitmap.h" 36 #include "block/block_int.h" 37 #include "trace.h" 38 #include "block/scsi.h" 39 #include "qemu/iov.h" 40 #include "sysemu/sysemu.h" 41 #include "qmp-commands.h" 42 43 #include <iscsi/iscsi.h> 44 #include <iscsi/scsi-lowlevel.h> 45 46 #ifdef __linux__ 47 #include <scsi/sg.h> 48 #include <block/scsi.h> 49 #endif 50 51 typedef struct IscsiLun { 52 struct iscsi_context *iscsi; 53 AioContext *aio_context; 54 int lun; 55 enum scsi_inquiry_peripheral_device_type type; 56 int block_size; 57 uint64_t num_blocks; 58 int events; 59 QEMUTimer *nop_timer; 60 uint8_t lbpme; 61 uint8_t lbprz; 62 uint8_t has_write_same; 63 struct scsi_inquiry_logical_block_provisioning lbp; 64 struct scsi_inquiry_block_limits bl; 65 unsigned char *zeroblock; 66 unsigned long *allocationmap; 67 int cluster_sectors; 68 bool use_16_for_rw; 69 } IscsiLun; 70 71 typedef struct IscsiTask { 72 int status; 73 int complete; 74 int retries; 75 int do_retry; 76 struct scsi_task *task; 77 Coroutine *co; 78 QEMUBH *bh; 79 IscsiLun *iscsilun; 80 QEMUTimer retry_timer; 81 } IscsiTask; 82 83 typedef struct IscsiAIOCB { 84 BlockDriverAIOCB common; 85 QEMUIOVector *qiov; 86 QEMUBH *bh; 87 IscsiLun *iscsilun; 88 struct scsi_task *task; 89 uint8_t *buf; 90 int status; 91 int64_t sector_num; 92 int nb_sectors; 93 #ifdef __linux__ 94 sg_io_hdr_t *ioh; 95 #endif 96 } IscsiAIOCB; 97 98 #define NOP_INTERVAL 5000 99 #define MAX_NOP_FAILURES 3 100 #define ISCSI_CMD_RETRIES ARRAY_SIZE(iscsi_retry_times) 101 static const unsigned iscsi_retry_times[] = {8, 32, 128, 512, 2048}; 102 103 /* this threshold is a trade-off knob to choose between 104 * the potential additional overhead of an extra GET_LBA_STATUS request 105 * vs. unnecessarily reading a lot of zero sectors over the wire. 106 * If a read request is greater or equal than ISCSI_CHECKALLOC_THRES 107 * sectors we check the allocation status of the area covered by the 108 * request first if the allocationmap indicates that the area might be 109 * unallocated. */ 110 #define ISCSI_CHECKALLOC_THRES 64 111 112 static void 113 iscsi_bh_cb(void *p) 114 { 115 IscsiAIOCB *acb = p; 116 117 qemu_bh_delete(acb->bh); 118 119 g_free(acb->buf); 120 acb->buf = NULL; 121 122 acb->common.cb(acb->common.opaque, acb->status); 123 124 if (acb->task != NULL) { 125 scsi_free_scsi_task(acb->task); 126 acb->task = NULL; 127 } 128 129 qemu_aio_unref(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 iTask->complete = 1; 146 qemu_bh_delete(iTask->bh); 147 qemu_coroutine_enter(iTask->co, NULL); 148 } 149 150 static void iscsi_retry_timer_expired(void *opaque) 151 { 152 struct IscsiTask *iTask = opaque; 153 iTask->complete = 1; 154 if (iTask->co) { 155 qemu_coroutine_enter(iTask->co, NULL); 156 } 157 } 158 159 static inline unsigned exp_random(double mean) 160 { 161 return -mean * log((double)rand() / RAND_MAX); 162 } 163 164 static void 165 iscsi_co_generic_cb(struct iscsi_context *iscsi, int status, 166 void *command_data, void *opaque) 167 { 168 struct IscsiTask *iTask = opaque; 169 struct scsi_task *task = command_data; 170 171 iTask->status = status; 172 iTask->do_retry = 0; 173 iTask->task = task; 174 175 if (status != SCSI_STATUS_GOOD) { 176 if (iTask->retries++ < ISCSI_CMD_RETRIES) { 177 if (status == SCSI_STATUS_CHECK_CONDITION 178 && task->sense.key == SCSI_SENSE_UNIT_ATTENTION) { 179 error_report("iSCSI CheckCondition: %s", 180 iscsi_get_error(iscsi)); 181 iTask->do_retry = 1; 182 goto out; 183 } 184 if (status == SCSI_STATUS_BUSY) { 185 unsigned retry_time = 186 exp_random(iscsi_retry_times[iTask->retries - 1]); 187 error_report("iSCSI Busy (retry #%u in %u ms): %s", 188 iTask->retries, retry_time, 189 iscsi_get_error(iscsi)); 190 aio_timer_init(iTask->iscsilun->aio_context, 191 &iTask->retry_timer, QEMU_CLOCK_REALTIME, 192 SCALE_MS, iscsi_retry_timer_expired, iTask); 193 timer_mod(&iTask->retry_timer, 194 qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + retry_time); 195 iTask->do_retry = 1; 196 return; 197 } 198 } 199 error_report("iSCSI Failure: %s", iscsi_get_error(iscsi)); 200 } 201 202 out: 203 if (iTask->co) { 204 iTask->bh = aio_bh_new(iTask->iscsilun->aio_context, 205 iscsi_co_generic_bh_cb, iTask); 206 qemu_bh_schedule(iTask->bh); 207 } else { 208 iTask->complete = 1; 209 } 210 } 211 212 static void iscsi_co_init_iscsitask(IscsiLun *iscsilun, struct IscsiTask *iTask) 213 { 214 *iTask = (struct IscsiTask) { 215 .co = qemu_coroutine_self(), 216 .iscsilun = iscsilun, 217 }; 218 } 219 220 static void 221 iscsi_abort_task_cb(struct iscsi_context *iscsi, int status, void *command_data, 222 void *private_data) 223 { 224 IscsiAIOCB *acb = private_data; 225 226 acb->status = -ECANCELED; 227 iscsi_schedule_bh(acb); 228 } 229 230 static void 231 iscsi_aio_cancel(BlockDriverAIOCB *blockacb) 232 { 233 IscsiAIOCB *acb = (IscsiAIOCB *)blockacb; 234 IscsiLun *iscsilun = acb->iscsilun; 235 236 if (acb->status != -EINPROGRESS) { 237 return; 238 } 239 240 /* send a task mgmt call to the target to cancel the task on the target */ 241 iscsi_task_mgmt_abort_task_async(iscsilun->iscsi, acb->task, 242 iscsi_abort_task_cb, acb); 243 244 } 245 246 static const AIOCBInfo iscsi_aiocb_info = { 247 .aiocb_size = sizeof(IscsiAIOCB), 248 .cancel_async = iscsi_aio_cancel, 249 }; 250 251 252 static void iscsi_process_read(void *arg); 253 static void iscsi_process_write(void *arg); 254 255 static void 256 iscsi_set_events(IscsiLun *iscsilun) 257 { 258 struct iscsi_context *iscsi = iscsilun->iscsi; 259 int ev; 260 261 /* We always register a read handler. */ 262 ev = POLLIN; 263 ev |= iscsi_which_events(iscsi); 264 if (ev != iscsilun->events) { 265 aio_set_fd_handler(iscsilun->aio_context, 266 iscsi_get_fd(iscsi), 267 iscsi_process_read, 268 (ev & POLLOUT) ? iscsi_process_write : NULL, 269 iscsilun); 270 271 } 272 273 iscsilun->events = ev; 274 } 275 276 static void 277 iscsi_process_read(void *arg) 278 { 279 IscsiLun *iscsilun = arg; 280 struct iscsi_context *iscsi = iscsilun->iscsi; 281 282 iscsi_service(iscsi, POLLIN); 283 iscsi_set_events(iscsilun); 284 } 285 286 static void 287 iscsi_process_write(void *arg) 288 { 289 IscsiLun *iscsilun = arg; 290 struct iscsi_context *iscsi = iscsilun->iscsi; 291 292 iscsi_service(iscsi, POLLOUT); 293 iscsi_set_events(iscsilun); 294 } 295 296 static int64_t sector_lun2qemu(int64_t sector, IscsiLun *iscsilun) 297 { 298 return sector * iscsilun->block_size / BDRV_SECTOR_SIZE; 299 } 300 301 static int64_t sector_qemu2lun(int64_t sector, IscsiLun *iscsilun) 302 { 303 return sector * BDRV_SECTOR_SIZE / iscsilun->block_size; 304 } 305 306 static bool is_request_lun_aligned(int64_t sector_num, int nb_sectors, 307 IscsiLun *iscsilun) 308 { 309 if ((sector_num * BDRV_SECTOR_SIZE) % iscsilun->block_size || 310 (nb_sectors * BDRV_SECTOR_SIZE) % iscsilun->block_size) { 311 error_report("iSCSI misaligned request: " 312 "iscsilun->block_size %u, sector_num %" PRIi64 313 ", nb_sectors %d", 314 iscsilun->block_size, sector_num, nb_sectors); 315 return 0; 316 } 317 return 1; 318 } 319 320 static void iscsi_allocationmap_set(IscsiLun *iscsilun, int64_t sector_num, 321 int nb_sectors) 322 { 323 if (iscsilun->allocationmap == NULL) { 324 return; 325 } 326 bitmap_set(iscsilun->allocationmap, 327 sector_num / iscsilun->cluster_sectors, 328 DIV_ROUND_UP(nb_sectors, iscsilun->cluster_sectors)); 329 } 330 331 static void iscsi_allocationmap_clear(IscsiLun *iscsilun, int64_t sector_num, 332 int nb_sectors) 333 { 334 int64_t cluster_num, nb_clusters; 335 if (iscsilun->allocationmap == NULL) { 336 return; 337 } 338 cluster_num = DIV_ROUND_UP(sector_num, iscsilun->cluster_sectors); 339 nb_clusters = (sector_num + nb_sectors) / iscsilun->cluster_sectors 340 - cluster_num; 341 if (nb_clusters > 0) { 342 bitmap_clear(iscsilun->allocationmap, cluster_num, nb_clusters); 343 } 344 } 345 346 static int coroutine_fn iscsi_co_writev(BlockDriverState *bs, 347 int64_t sector_num, int nb_sectors, 348 QEMUIOVector *iov) 349 { 350 IscsiLun *iscsilun = bs->opaque; 351 struct IscsiTask iTask; 352 uint64_t lba; 353 uint32_t num_sectors; 354 355 if (!is_request_lun_aligned(sector_num, nb_sectors, iscsilun)) { 356 return -EINVAL; 357 } 358 359 lba = sector_qemu2lun(sector_num, iscsilun); 360 num_sectors = sector_qemu2lun(nb_sectors, iscsilun); 361 iscsi_co_init_iscsitask(iscsilun, &iTask); 362 retry: 363 if (iscsilun->use_16_for_rw) { 364 iTask.task = iscsi_write16_task(iscsilun->iscsi, iscsilun->lun, lba, 365 NULL, num_sectors * iscsilun->block_size, 366 iscsilun->block_size, 0, 0, 0, 0, 0, 367 iscsi_co_generic_cb, &iTask); 368 } else { 369 iTask.task = iscsi_write10_task(iscsilun->iscsi, iscsilun->lun, lba, 370 NULL, num_sectors * iscsilun->block_size, 371 iscsilun->block_size, 0, 0, 0, 0, 0, 372 iscsi_co_generic_cb, &iTask); 373 } 374 if (iTask.task == NULL) { 375 return -ENOMEM; 376 } 377 scsi_task_set_iov_out(iTask.task, (struct scsi_iovec *) iov->iov, 378 iov->niov); 379 while (!iTask.complete) { 380 iscsi_set_events(iscsilun); 381 qemu_coroutine_yield(); 382 } 383 384 if (iTask.task != NULL) { 385 scsi_free_scsi_task(iTask.task); 386 iTask.task = NULL; 387 } 388 389 if (iTask.do_retry) { 390 iTask.complete = 0; 391 goto retry; 392 } 393 394 if (iTask.status != SCSI_STATUS_GOOD) { 395 return -EIO; 396 } 397 398 iscsi_allocationmap_set(iscsilun, sector_num, nb_sectors); 399 400 return 0; 401 } 402 403 404 static bool iscsi_allocationmap_is_allocated(IscsiLun *iscsilun, 405 int64_t sector_num, int nb_sectors) 406 { 407 unsigned long size; 408 if (iscsilun->allocationmap == NULL) { 409 return true; 410 } 411 size = DIV_ROUND_UP(sector_num + nb_sectors, iscsilun->cluster_sectors); 412 return !(find_next_bit(iscsilun->allocationmap, size, 413 sector_num / iscsilun->cluster_sectors) == size); 414 } 415 416 static int64_t coroutine_fn iscsi_co_get_block_status(BlockDriverState *bs, 417 int64_t sector_num, 418 int nb_sectors, int *pnum) 419 { 420 IscsiLun *iscsilun = bs->opaque; 421 struct scsi_get_lba_status *lbas = NULL; 422 struct scsi_lba_status_descriptor *lbasd = NULL; 423 struct IscsiTask iTask; 424 int64_t ret; 425 426 iscsi_co_init_iscsitask(iscsilun, &iTask); 427 428 if (!is_request_lun_aligned(sector_num, nb_sectors, iscsilun)) { 429 ret = -EINVAL; 430 goto out; 431 } 432 433 /* default to all sectors allocated */ 434 ret = BDRV_BLOCK_DATA; 435 ret |= (sector_num << BDRV_SECTOR_BITS) | BDRV_BLOCK_OFFSET_VALID; 436 *pnum = nb_sectors; 437 438 /* LUN does not support logical block provisioning */ 439 if (iscsilun->lbpme == 0) { 440 goto out; 441 } 442 443 retry: 444 if (iscsi_get_lba_status_task(iscsilun->iscsi, iscsilun->lun, 445 sector_qemu2lun(sector_num, iscsilun), 446 8 + 16, iscsi_co_generic_cb, 447 &iTask) == NULL) { 448 ret = -ENOMEM; 449 goto out; 450 } 451 452 while (!iTask.complete) { 453 iscsi_set_events(iscsilun); 454 qemu_coroutine_yield(); 455 } 456 457 if (iTask.do_retry) { 458 if (iTask.task != NULL) { 459 scsi_free_scsi_task(iTask.task); 460 iTask.task = NULL; 461 } 462 iTask.complete = 0; 463 goto retry; 464 } 465 466 if (iTask.status != SCSI_STATUS_GOOD) { 467 /* in case the get_lba_status_callout fails (i.e. 468 * because the device is busy or the cmd is not 469 * supported) we pretend all blocks are allocated 470 * for backwards compatibility */ 471 goto out; 472 } 473 474 lbas = scsi_datain_unmarshall(iTask.task); 475 if (lbas == NULL) { 476 ret = -EIO; 477 goto out; 478 } 479 480 lbasd = &lbas->descriptors[0]; 481 482 if (sector_qemu2lun(sector_num, iscsilun) != lbasd->lba) { 483 ret = -EIO; 484 goto out; 485 } 486 487 *pnum = sector_lun2qemu(lbasd->num_blocks, iscsilun); 488 489 if (lbasd->provisioning == SCSI_PROVISIONING_TYPE_DEALLOCATED || 490 lbasd->provisioning == SCSI_PROVISIONING_TYPE_ANCHORED) { 491 ret &= ~BDRV_BLOCK_DATA; 492 if (iscsilun->lbprz) { 493 ret |= BDRV_BLOCK_ZERO; 494 } 495 } 496 497 if (ret & BDRV_BLOCK_ZERO) { 498 iscsi_allocationmap_clear(iscsilun, sector_num, *pnum); 499 } else { 500 iscsi_allocationmap_set(iscsilun, sector_num, *pnum); 501 } 502 503 if (*pnum > nb_sectors) { 504 *pnum = nb_sectors; 505 } 506 out: 507 if (iTask.task != NULL) { 508 scsi_free_scsi_task(iTask.task); 509 } 510 return ret; 511 } 512 513 static int coroutine_fn iscsi_co_readv(BlockDriverState *bs, 514 int64_t sector_num, int nb_sectors, 515 QEMUIOVector *iov) 516 { 517 IscsiLun *iscsilun = bs->opaque; 518 struct IscsiTask iTask; 519 uint64_t lba; 520 uint32_t num_sectors; 521 522 if (!is_request_lun_aligned(sector_num, nb_sectors, iscsilun)) { 523 return -EINVAL; 524 } 525 526 if (iscsilun->lbprz && nb_sectors >= ISCSI_CHECKALLOC_THRES && 527 !iscsi_allocationmap_is_allocated(iscsilun, sector_num, nb_sectors)) { 528 int64_t ret; 529 int pnum; 530 ret = iscsi_co_get_block_status(bs, sector_num, INT_MAX, &pnum); 531 if (ret < 0) { 532 return ret; 533 } 534 if (ret & BDRV_BLOCK_ZERO && pnum >= nb_sectors) { 535 qemu_iovec_memset(iov, 0, 0x00, iov->size); 536 return 0; 537 } 538 } 539 540 lba = sector_qemu2lun(sector_num, iscsilun); 541 num_sectors = sector_qemu2lun(nb_sectors, iscsilun); 542 543 iscsi_co_init_iscsitask(iscsilun, &iTask); 544 retry: 545 if (iscsilun->use_16_for_rw) { 546 iTask.task = iscsi_read16_task(iscsilun->iscsi, iscsilun->lun, lba, 547 num_sectors * iscsilun->block_size, 548 iscsilun->block_size, 0, 0, 0, 0, 0, 549 iscsi_co_generic_cb, &iTask); 550 } else { 551 iTask.task = iscsi_read10_task(iscsilun->iscsi, iscsilun->lun, lba, 552 num_sectors * iscsilun->block_size, 553 iscsilun->block_size, 554 0, 0, 0, 0, 0, 555 iscsi_co_generic_cb, &iTask); 556 } 557 if (iTask.task == NULL) { 558 return -ENOMEM; 559 } 560 scsi_task_set_iov_in(iTask.task, (struct scsi_iovec *) iov->iov, iov->niov); 561 562 while (!iTask.complete) { 563 iscsi_set_events(iscsilun); 564 qemu_coroutine_yield(); 565 } 566 567 if (iTask.task != NULL) { 568 scsi_free_scsi_task(iTask.task); 569 iTask.task = NULL; 570 } 571 572 if (iTask.do_retry) { 573 iTask.complete = 0; 574 goto retry; 575 } 576 577 if (iTask.status != SCSI_STATUS_GOOD) { 578 return -EIO; 579 } 580 581 return 0; 582 } 583 584 static int coroutine_fn iscsi_co_flush(BlockDriverState *bs) 585 { 586 IscsiLun *iscsilun = bs->opaque; 587 struct IscsiTask iTask; 588 589 if (bs->sg) { 590 return 0; 591 } 592 593 iscsi_co_init_iscsitask(iscsilun, &iTask); 594 595 retry: 596 if (iscsi_synchronizecache10_task(iscsilun->iscsi, iscsilun->lun, 0, 0, 0, 597 0, iscsi_co_generic_cb, &iTask) == NULL) { 598 return -ENOMEM; 599 } 600 601 while (!iTask.complete) { 602 iscsi_set_events(iscsilun); 603 qemu_coroutine_yield(); 604 } 605 606 if (iTask.task != NULL) { 607 scsi_free_scsi_task(iTask.task); 608 iTask.task = NULL; 609 } 610 611 if (iTask.do_retry) { 612 iTask.complete = 0; 613 goto retry; 614 } 615 616 if (iTask.status != SCSI_STATUS_GOOD) { 617 return -EIO; 618 } 619 620 return 0; 621 } 622 623 #ifdef __linux__ 624 static void 625 iscsi_aio_ioctl_cb(struct iscsi_context *iscsi, int status, 626 void *command_data, void *opaque) 627 { 628 IscsiAIOCB *acb = opaque; 629 630 g_free(acb->buf); 631 acb->buf = NULL; 632 633 acb->status = 0; 634 if (status < 0) { 635 error_report("Failed to ioctl(SG_IO) to iSCSI lun. %s", 636 iscsi_get_error(iscsi)); 637 acb->status = -EIO; 638 } 639 640 acb->ioh->driver_status = 0; 641 acb->ioh->host_status = 0; 642 acb->ioh->resid = 0; 643 644 #define SG_ERR_DRIVER_SENSE 0x08 645 646 if (status == SCSI_STATUS_CHECK_CONDITION && acb->task->datain.size >= 2) { 647 int ss; 648 649 acb->ioh->driver_status |= SG_ERR_DRIVER_SENSE; 650 651 acb->ioh->sb_len_wr = acb->task->datain.size - 2; 652 ss = (acb->ioh->mx_sb_len >= acb->ioh->sb_len_wr) ? 653 acb->ioh->mx_sb_len : acb->ioh->sb_len_wr; 654 memcpy(acb->ioh->sbp, &acb->task->datain.data[2], ss); 655 } 656 657 iscsi_schedule_bh(acb); 658 } 659 660 static BlockDriverAIOCB *iscsi_aio_ioctl(BlockDriverState *bs, 661 unsigned long int req, void *buf, 662 BlockDriverCompletionFunc *cb, void *opaque) 663 { 664 IscsiLun *iscsilun = bs->opaque; 665 struct iscsi_context *iscsi = iscsilun->iscsi; 666 struct iscsi_data data; 667 IscsiAIOCB *acb; 668 669 assert(req == SG_IO); 670 671 acb = qemu_aio_get(&iscsi_aiocb_info, bs, cb, opaque); 672 673 acb->iscsilun = iscsilun; 674 acb->bh = NULL; 675 acb->status = -EINPROGRESS; 676 acb->buf = NULL; 677 acb->ioh = buf; 678 679 acb->task = malloc(sizeof(struct scsi_task)); 680 if (acb->task == NULL) { 681 error_report("iSCSI: Failed to allocate task for scsi command. %s", 682 iscsi_get_error(iscsi)); 683 qemu_aio_unref(acb); 684 return NULL; 685 } 686 memset(acb->task, 0, sizeof(struct scsi_task)); 687 688 switch (acb->ioh->dxfer_direction) { 689 case SG_DXFER_TO_DEV: 690 acb->task->xfer_dir = SCSI_XFER_WRITE; 691 break; 692 case SG_DXFER_FROM_DEV: 693 acb->task->xfer_dir = SCSI_XFER_READ; 694 break; 695 default: 696 acb->task->xfer_dir = SCSI_XFER_NONE; 697 break; 698 } 699 700 acb->task->cdb_size = acb->ioh->cmd_len; 701 memcpy(&acb->task->cdb[0], acb->ioh->cmdp, acb->ioh->cmd_len); 702 acb->task->expxferlen = acb->ioh->dxfer_len; 703 704 data.size = 0; 705 if (acb->task->xfer_dir == SCSI_XFER_WRITE) { 706 if (acb->ioh->iovec_count == 0) { 707 data.data = acb->ioh->dxferp; 708 data.size = acb->ioh->dxfer_len; 709 } else { 710 scsi_task_set_iov_out(acb->task, 711 (struct scsi_iovec *) acb->ioh->dxferp, 712 acb->ioh->iovec_count); 713 } 714 } 715 716 if (iscsi_scsi_command_async(iscsi, iscsilun->lun, acb->task, 717 iscsi_aio_ioctl_cb, 718 (data.size > 0) ? &data : NULL, 719 acb) != 0) { 720 scsi_free_scsi_task(acb->task); 721 qemu_aio_unref(acb); 722 return NULL; 723 } 724 725 /* tell libiscsi to read straight into the buffer we got from ioctl */ 726 if (acb->task->xfer_dir == SCSI_XFER_READ) { 727 if (acb->ioh->iovec_count == 0) { 728 scsi_task_add_data_in_buffer(acb->task, 729 acb->ioh->dxfer_len, 730 acb->ioh->dxferp); 731 } else { 732 scsi_task_set_iov_in(acb->task, 733 (struct scsi_iovec *) acb->ioh->dxferp, 734 acb->ioh->iovec_count); 735 } 736 } 737 738 iscsi_set_events(iscsilun); 739 740 return &acb->common; 741 } 742 743 static void ioctl_cb(void *opaque, int status) 744 { 745 int *p_status = opaque; 746 *p_status = status; 747 } 748 749 static int iscsi_ioctl(BlockDriverState *bs, unsigned long int req, void *buf) 750 { 751 IscsiLun *iscsilun = bs->opaque; 752 int status; 753 754 switch (req) { 755 case SG_GET_VERSION_NUM: 756 *(int *)buf = 30000; 757 break; 758 case SG_GET_SCSI_ID: 759 ((struct sg_scsi_id *)buf)->scsi_type = iscsilun->type; 760 break; 761 case SG_IO: 762 status = -EINPROGRESS; 763 iscsi_aio_ioctl(bs, req, buf, ioctl_cb, &status); 764 765 while (status == -EINPROGRESS) { 766 aio_poll(iscsilun->aio_context, true); 767 } 768 769 return 0; 770 default: 771 return -1; 772 } 773 return 0; 774 } 775 #endif 776 777 static int64_t 778 iscsi_getlength(BlockDriverState *bs) 779 { 780 IscsiLun *iscsilun = bs->opaque; 781 int64_t len; 782 783 len = iscsilun->num_blocks; 784 len *= iscsilun->block_size; 785 786 return len; 787 } 788 789 static int 790 coroutine_fn iscsi_co_discard(BlockDriverState *bs, int64_t sector_num, 791 int nb_sectors) 792 { 793 IscsiLun *iscsilun = bs->opaque; 794 struct IscsiTask iTask; 795 struct unmap_list list; 796 797 if (!is_request_lun_aligned(sector_num, nb_sectors, iscsilun)) { 798 return -EINVAL; 799 } 800 801 if (!iscsilun->lbp.lbpu) { 802 /* UNMAP is not supported by the target */ 803 return 0; 804 } 805 806 list.lba = sector_qemu2lun(sector_num, iscsilun); 807 list.num = sector_qemu2lun(nb_sectors, iscsilun); 808 809 iscsi_co_init_iscsitask(iscsilun, &iTask); 810 retry: 811 if (iscsi_unmap_task(iscsilun->iscsi, iscsilun->lun, 0, 0, &list, 1, 812 iscsi_co_generic_cb, &iTask) == NULL) { 813 return -ENOMEM; 814 } 815 816 while (!iTask.complete) { 817 iscsi_set_events(iscsilun); 818 qemu_coroutine_yield(); 819 } 820 821 if (iTask.task != NULL) { 822 scsi_free_scsi_task(iTask.task); 823 iTask.task = NULL; 824 } 825 826 if (iTask.do_retry) { 827 iTask.complete = 0; 828 goto retry; 829 } 830 831 if (iTask.status == SCSI_STATUS_CHECK_CONDITION) { 832 /* the target might fail with a check condition if it 833 is not happy with the alignment of the UNMAP request 834 we silently fail in this case */ 835 return 0; 836 } 837 838 if (iTask.status != SCSI_STATUS_GOOD) { 839 return -EIO; 840 } 841 842 iscsi_allocationmap_clear(iscsilun, sector_num, nb_sectors); 843 844 return 0; 845 } 846 847 static int 848 coroutine_fn iscsi_co_write_zeroes(BlockDriverState *bs, int64_t sector_num, 849 int nb_sectors, BdrvRequestFlags flags) 850 { 851 IscsiLun *iscsilun = bs->opaque; 852 struct IscsiTask iTask; 853 uint64_t lba; 854 uint32_t nb_blocks; 855 bool use_16_for_ws = iscsilun->use_16_for_rw; 856 857 if (!is_request_lun_aligned(sector_num, nb_sectors, iscsilun)) { 858 return -EINVAL; 859 } 860 861 if (flags & BDRV_REQ_MAY_UNMAP) { 862 if (!use_16_for_ws && !iscsilun->lbp.lbpws10) { 863 /* WRITESAME10 with UNMAP is unsupported try WRITESAME16 */ 864 use_16_for_ws = true; 865 } 866 if (use_16_for_ws && !iscsilun->lbp.lbpws) { 867 /* WRITESAME16 with UNMAP is not supported by the target, 868 * fall back and try WRITESAME10/16 without UNMAP */ 869 flags &= ~BDRV_REQ_MAY_UNMAP; 870 use_16_for_ws = iscsilun->use_16_for_rw; 871 } 872 } 873 874 if (!(flags & BDRV_REQ_MAY_UNMAP) && !iscsilun->has_write_same) { 875 /* WRITESAME without UNMAP is not supported by the target */ 876 return -ENOTSUP; 877 } 878 879 lba = sector_qemu2lun(sector_num, iscsilun); 880 nb_blocks = sector_qemu2lun(nb_sectors, iscsilun); 881 882 if (iscsilun->zeroblock == NULL) { 883 iscsilun->zeroblock = g_try_malloc0(iscsilun->block_size); 884 if (iscsilun->zeroblock == NULL) { 885 return -ENOMEM; 886 } 887 } 888 889 iscsi_co_init_iscsitask(iscsilun, &iTask); 890 retry: 891 if (use_16_for_ws) { 892 iTask.task = iscsi_writesame16_task(iscsilun->iscsi, iscsilun->lun, lba, 893 iscsilun->zeroblock, iscsilun->block_size, 894 nb_blocks, 0, !!(flags & BDRV_REQ_MAY_UNMAP), 895 0, 0, iscsi_co_generic_cb, &iTask); 896 } else { 897 iTask.task = iscsi_writesame10_task(iscsilun->iscsi, iscsilun->lun, lba, 898 iscsilun->zeroblock, iscsilun->block_size, 899 nb_blocks, 0, !!(flags & BDRV_REQ_MAY_UNMAP), 900 0, 0, iscsi_co_generic_cb, &iTask); 901 } 902 if (iTask.task == NULL) { 903 return -ENOMEM; 904 } 905 906 while (!iTask.complete) { 907 iscsi_set_events(iscsilun); 908 qemu_coroutine_yield(); 909 } 910 911 if (iTask.status == SCSI_STATUS_CHECK_CONDITION && 912 iTask.task->sense.key == SCSI_SENSE_ILLEGAL_REQUEST && 913 (iTask.task->sense.ascq == SCSI_SENSE_ASCQ_INVALID_OPERATION_CODE || 914 iTask.task->sense.ascq == SCSI_SENSE_ASCQ_INVALID_FIELD_IN_CDB)) { 915 /* WRITE SAME is not supported by the target */ 916 iscsilun->has_write_same = false; 917 scsi_free_scsi_task(iTask.task); 918 return -ENOTSUP; 919 } 920 921 if (iTask.task != NULL) { 922 scsi_free_scsi_task(iTask.task); 923 iTask.task = NULL; 924 } 925 926 if (iTask.do_retry) { 927 iTask.complete = 0; 928 goto retry; 929 } 930 931 if (iTask.status != SCSI_STATUS_GOOD) { 932 return -EIO; 933 } 934 935 if (flags & BDRV_REQ_MAY_UNMAP) { 936 iscsi_allocationmap_clear(iscsilun, sector_num, nb_sectors); 937 } else { 938 iscsi_allocationmap_set(iscsilun, sector_num, nb_sectors); 939 } 940 941 return 0; 942 } 943 944 static void parse_chap(struct iscsi_context *iscsi, const char *target, 945 Error **errp) 946 { 947 QemuOptsList *list; 948 QemuOpts *opts; 949 const char *user = NULL; 950 const char *password = NULL; 951 952 list = qemu_find_opts("iscsi"); 953 if (!list) { 954 return; 955 } 956 957 opts = qemu_opts_find(list, target); 958 if (opts == NULL) { 959 opts = QTAILQ_FIRST(&list->head); 960 if (!opts) { 961 return; 962 } 963 } 964 965 user = qemu_opt_get(opts, "user"); 966 if (!user) { 967 return; 968 } 969 970 password = qemu_opt_get(opts, "password"); 971 if (!password) { 972 error_setg(errp, "CHAP username specified but no password was given"); 973 return; 974 } 975 976 if (iscsi_set_initiator_username_pwd(iscsi, user, password)) { 977 error_setg(errp, "Failed to set initiator username and password"); 978 } 979 } 980 981 static void parse_header_digest(struct iscsi_context *iscsi, const char *target, 982 Error **errp) 983 { 984 QemuOptsList *list; 985 QemuOpts *opts; 986 const char *digest = NULL; 987 988 list = qemu_find_opts("iscsi"); 989 if (!list) { 990 return; 991 } 992 993 opts = qemu_opts_find(list, target); 994 if (opts == NULL) { 995 opts = QTAILQ_FIRST(&list->head); 996 if (!opts) { 997 return; 998 } 999 } 1000 1001 digest = qemu_opt_get(opts, "header-digest"); 1002 if (!digest) { 1003 return; 1004 } 1005 1006 if (!strcmp(digest, "CRC32C")) { 1007 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_CRC32C); 1008 } else if (!strcmp(digest, "NONE")) { 1009 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE); 1010 } else if (!strcmp(digest, "CRC32C-NONE")) { 1011 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_CRC32C_NONE); 1012 } else if (!strcmp(digest, "NONE-CRC32C")) { 1013 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE_CRC32C); 1014 } else { 1015 error_setg(errp, "Invalid header-digest setting : %s", digest); 1016 } 1017 } 1018 1019 static char *parse_initiator_name(const char *target) 1020 { 1021 QemuOptsList *list; 1022 QemuOpts *opts; 1023 const char *name; 1024 char *iscsi_name; 1025 UuidInfo *uuid_info; 1026 1027 list = qemu_find_opts("iscsi"); 1028 if (list) { 1029 opts = qemu_opts_find(list, target); 1030 if (!opts) { 1031 opts = QTAILQ_FIRST(&list->head); 1032 } 1033 if (opts) { 1034 name = qemu_opt_get(opts, "initiator-name"); 1035 if (name) { 1036 return g_strdup(name); 1037 } 1038 } 1039 } 1040 1041 uuid_info = qmp_query_uuid(NULL); 1042 if (strcmp(uuid_info->UUID, UUID_NONE) == 0) { 1043 name = qemu_get_vm_name(); 1044 } else { 1045 name = uuid_info->UUID; 1046 } 1047 iscsi_name = g_strdup_printf("iqn.2008-11.org.linux-kvm%s%s", 1048 name ? ":" : "", name ? name : ""); 1049 qapi_free_UuidInfo(uuid_info); 1050 return iscsi_name; 1051 } 1052 1053 static void iscsi_nop_timed_event(void *opaque) 1054 { 1055 IscsiLun *iscsilun = opaque; 1056 1057 if (iscsi_get_nops_in_flight(iscsilun->iscsi) > MAX_NOP_FAILURES) { 1058 error_report("iSCSI: NOP timeout. Reconnecting..."); 1059 iscsi_reconnect(iscsilun->iscsi); 1060 } 1061 1062 if (iscsi_nop_out_async(iscsilun->iscsi, NULL, NULL, 0, NULL) != 0) { 1063 error_report("iSCSI: failed to sent NOP-Out. Disabling NOP messages."); 1064 return; 1065 } 1066 1067 timer_mod(iscsilun->nop_timer, qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + NOP_INTERVAL); 1068 iscsi_set_events(iscsilun); 1069 } 1070 1071 static void iscsi_readcapacity_sync(IscsiLun *iscsilun, Error **errp) 1072 { 1073 struct scsi_task *task = NULL; 1074 struct scsi_readcapacity10 *rc10 = NULL; 1075 struct scsi_readcapacity16 *rc16 = NULL; 1076 int retries = ISCSI_CMD_RETRIES; 1077 1078 do { 1079 if (task != NULL) { 1080 scsi_free_scsi_task(task); 1081 task = NULL; 1082 } 1083 1084 switch (iscsilun->type) { 1085 case TYPE_DISK: 1086 task = iscsi_readcapacity16_sync(iscsilun->iscsi, iscsilun->lun); 1087 if (task != NULL && task->status == SCSI_STATUS_GOOD) { 1088 rc16 = scsi_datain_unmarshall(task); 1089 if (rc16 == NULL) { 1090 error_setg(errp, "iSCSI: Failed to unmarshall readcapacity16 data."); 1091 } else { 1092 iscsilun->block_size = rc16->block_length; 1093 iscsilun->num_blocks = rc16->returned_lba + 1; 1094 iscsilun->lbpme = rc16->lbpme; 1095 iscsilun->lbprz = rc16->lbprz; 1096 iscsilun->use_16_for_rw = (rc16->returned_lba > 0xffffffff); 1097 } 1098 } 1099 break; 1100 case TYPE_ROM: 1101 task = iscsi_readcapacity10_sync(iscsilun->iscsi, iscsilun->lun, 0, 0); 1102 if (task != NULL && task->status == SCSI_STATUS_GOOD) { 1103 rc10 = scsi_datain_unmarshall(task); 1104 if (rc10 == NULL) { 1105 error_setg(errp, "iSCSI: Failed to unmarshall readcapacity10 data."); 1106 } else { 1107 iscsilun->block_size = rc10->block_size; 1108 if (rc10->lba == 0) { 1109 /* blank disk loaded */ 1110 iscsilun->num_blocks = 0; 1111 } else { 1112 iscsilun->num_blocks = rc10->lba + 1; 1113 } 1114 } 1115 } 1116 break; 1117 default: 1118 return; 1119 } 1120 } while (task != NULL && task->status == SCSI_STATUS_CHECK_CONDITION 1121 && task->sense.key == SCSI_SENSE_UNIT_ATTENTION 1122 && retries-- > 0); 1123 1124 if (task == NULL || task->status != SCSI_STATUS_GOOD) { 1125 error_setg(errp, "iSCSI: failed to send readcapacity10 command."); 1126 } 1127 if (task) { 1128 scsi_free_scsi_task(task); 1129 } 1130 } 1131 1132 /* TODO Convert to fine grained options */ 1133 static QemuOptsList runtime_opts = { 1134 .name = "iscsi", 1135 .head = QTAILQ_HEAD_INITIALIZER(runtime_opts.head), 1136 .desc = { 1137 { 1138 .name = "filename", 1139 .type = QEMU_OPT_STRING, 1140 .help = "URL to the iscsi image", 1141 }, 1142 { /* end of list */ } 1143 }, 1144 }; 1145 1146 static struct scsi_task *iscsi_do_inquiry(struct iscsi_context *iscsi, int lun, 1147 int evpd, int pc, void **inq, Error **errp) 1148 { 1149 int full_size; 1150 struct scsi_task *task = NULL; 1151 task = iscsi_inquiry_sync(iscsi, lun, evpd, pc, 64); 1152 if (task == NULL || task->status != SCSI_STATUS_GOOD) { 1153 goto fail; 1154 } 1155 full_size = scsi_datain_getfullsize(task); 1156 if (full_size > task->datain.size) { 1157 scsi_free_scsi_task(task); 1158 1159 /* we need more data for the full list */ 1160 task = iscsi_inquiry_sync(iscsi, lun, evpd, pc, full_size); 1161 if (task == NULL || task->status != SCSI_STATUS_GOOD) { 1162 goto fail; 1163 } 1164 } 1165 1166 *inq = scsi_datain_unmarshall(task); 1167 if (*inq == NULL) { 1168 error_setg(errp, "iSCSI: failed to unmarshall inquiry datain blob"); 1169 goto fail_with_err; 1170 } 1171 1172 return task; 1173 1174 fail: 1175 error_setg(errp, "iSCSI: Inquiry command failed : %s", 1176 iscsi_get_error(iscsi)); 1177 fail_with_err: 1178 if (task != NULL) { 1179 scsi_free_scsi_task(task); 1180 } 1181 return NULL; 1182 } 1183 1184 static void iscsi_detach_aio_context(BlockDriverState *bs) 1185 { 1186 IscsiLun *iscsilun = bs->opaque; 1187 1188 aio_set_fd_handler(iscsilun->aio_context, 1189 iscsi_get_fd(iscsilun->iscsi), 1190 NULL, NULL, NULL); 1191 iscsilun->events = 0; 1192 1193 if (iscsilun->nop_timer) { 1194 timer_del(iscsilun->nop_timer); 1195 timer_free(iscsilun->nop_timer); 1196 iscsilun->nop_timer = NULL; 1197 } 1198 } 1199 1200 static void iscsi_attach_aio_context(BlockDriverState *bs, 1201 AioContext *new_context) 1202 { 1203 IscsiLun *iscsilun = bs->opaque; 1204 1205 iscsilun->aio_context = new_context; 1206 iscsi_set_events(iscsilun); 1207 1208 /* Set up a timer for sending out iSCSI NOPs */ 1209 iscsilun->nop_timer = aio_timer_new(iscsilun->aio_context, 1210 QEMU_CLOCK_REALTIME, SCALE_MS, 1211 iscsi_nop_timed_event, iscsilun); 1212 timer_mod(iscsilun->nop_timer, 1213 qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + NOP_INTERVAL); 1214 } 1215 1216 /* 1217 * We support iscsi url's on the form 1218 * iscsi://[<username>%<password>@]<host>[:<port>]/<targetname>/<lun> 1219 * 1220 * Note: flags are currently not used by iscsi_open. If this function 1221 * is changed such that flags are used, please examine iscsi_reopen_prepare() 1222 * to see if needs to be changed as well. 1223 */ 1224 static int iscsi_open(BlockDriverState *bs, QDict *options, int flags, 1225 Error **errp) 1226 { 1227 IscsiLun *iscsilun = bs->opaque; 1228 struct iscsi_context *iscsi = NULL; 1229 struct iscsi_url *iscsi_url = NULL; 1230 struct scsi_task *task = NULL; 1231 struct scsi_inquiry_standard *inq = NULL; 1232 struct scsi_inquiry_supported_pages *inq_vpd; 1233 char *initiator_name = NULL; 1234 QemuOpts *opts; 1235 Error *local_err = NULL; 1236 const char *filename; 1237 int i, ret; 1238 1239 if ((BDRV_SECTOR_SIZE % 512) != 0) { 1240 error_setg(errp, "iSCSI: Invalid BDRV_SECTOR_SIZE. " 1241 "BDRV_SECTOR_SIZE(%lld) is not a multiple " 1242 "of 512", BDRV_SECTOR_SIZE); 1243 return -EINVAL; 1244 } 1245 1246 opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort); 1247 qemu_opts_absorb_qdict(opts, options, &local_err); 1248 if (local_err) { 1249 error_propagate(errp, local_err); 1250 ret = -EINVAL; 1251 goto out; 1252 } 1253 1254 filename = qemu_opt_get(opts, "filename"); 1255 1256 iscsi_url = iscsi_parse_full_url(iscsi, filename); 1257 if (iscsi_url == NULL) { 1258 error_setg(errp, "Failed to parse URL : %s", filename); 1259 ret = -EINVAL; 1260 goto out; 1261 } 1262 1263 memset(iscsilun, 0, sizeof(IscsiLun)); 1264 1265 initiator_name = parse_initiator_name(iscsi_url->target); 1266 1267 iscsi = iscsi_create_context(initiator_name); 1268 if (iscsi == NULL) { 1269 error_setg(errp, "iSCSI: Failed to create iSCSI context."); 1270 ret = -ENOMEM; 1271 goto out; 1272 } 1273 1274 if (iscsi_set_targetname(iscsi, iscsi_url->target)) { 1275 error_setg(errp, "iSCSI: Failed to set target name."); 1276 ret = -EINVAL; 1277 goto out; 1278 } 1279 1280 if (iscsi_url->user != NULL) { 1281 ret = iscsi_set_initiator_username_pwd(iscsi, iscsi_url->user, 1282 iscsi_url->passwd); 1283 if (ret != 0) { 1284 error_setg(errp, "Failed to set initiator username and password"); 1285 ret = -EINVAL; 1286 goto out; 1287 } 1288 } 1289 1290 /* check if we got CHAP username/password via the options */ 1291 parse_chap(iscsi, iscsi_url->target, &local_err); 1292 if (local_err != NULL) { 1293 error_propagate(errp, local_err); 1294 ret = -EINVAL; 1295 goto out; 1296 } 1297 1298 if (iscsi_set_session_type(iscsi, ISCSI_SESSION_NORMAL) != 0) { 1299 error_setg(errp, "iSCSI: Failed to set session type to normal."); 1300 ret = -EINVAL; 1301 goto out; 1302 } 1303 1304 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE_CRC32C); 1305 1306 /* check if we got HEADER_DIGEST via the options */ 1307 parse_header_digest(iscsi, iscsi_url->target, &local_err); 1308 if (local_err != NULL) { 1309 error_propagate(errp, local_err); 1310 ret = -EINVAL; 1311 goto out; 1312 } 1313 1314 if (iscsi_full_connect_sync(iscsi, iscsi_url->portal, iscsi_url->lun) != 0) { 1315 error_setg(errp, "iSCSI: Failed to connect to LUN : %s", 1316 iscsi_get_error(iscsi)); 1317 ret = -EINVAL; 1318 goto out; 1319 } 1320 1321 iscsilun->iscsi = iscsi; 1322 iscsilun->aio_context = bdrv_get_aio_context(bs); 1323 iscsilun->lun = iscsi_url->lun; 1324 iscsilun->has_write_same = true; 1325 1326 task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 0, 0, 1327 (void **) &inq, errp); 1328 if (task == NULL) { 1329 ret = -EINVAL; 1330 goto out; 1331 } 1332 iscsilun->type = inq->periperal_device_type; 1333 scsi_free_scsi_task(task); 1334 task = NULL; 1335 1336 iscsi_readcapacity_sync(iscsilun, &local_err); 1337 if (local_err != NULL) { 1338 error_propagate(errp, local_err); 1339 ret = -EINVAL; 1340 goto out; 1341 } 1342 bs->total_sectors = sector_lun2qemu(iscsilun->num_blocks, iscsilun); 1343 bs->request_alignment = iscsilun->block_size; 1344 1345 /* We don't have any emulation for devices other than disks and CD-ROMs, so 1346 * this must be sg ioctl compatible. We force it to be sg, otherwise qemu 1347 * will try to read from the device to guess the image format. 1348 */ 1349 if (iscsilun->type != TYPE_DISK && iscsilun->type != TYPE_ROM) { 1350 bs->sg = 1; 1351 } 1352 1353 task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1, 1354 SCSI_INQUIRY_PAGECODE_SUPPORTED_VPD_PAGES, 1355 (void **) &inq_vpd, errp); 1356 if (task == NULL) { 1357 ret = -EINVAL; 1358 goto out; 1359 } 1360 for (i = 0; i < inq_vpd->num_pages; i++) { 1361 struct scsi_task *inq_task; 1362 struct scsi_inquiry_logical_block_provisioning *inq_lbp; 1363 struct scsi_inquiry_block_limits *inq_bl; 1364 switch (inq_vpd->pages[i]) { 1365 case SCSI_INQUIRY_PAGECODE_LOGICAL_BLOCK_PROVISIONING: 1366 inq_task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1, 1367 SCSI_INQUIRY_PAGECODE_LOGICAL_BLOCK_PROVISIONING, 1368 (void **) &inq_lbp, errp); 1369 if (inq_task == NULL) { 1370 ret = -EINVAL; 1371 goto out; 1372 } 1373 memcpy(&iscsilun->lbp, inq_lbp, 1374 sizeof(struct scsi_inquiry_logical_block_provisioning)); 1375 scsi_free_scsi_task(inq_task); 1376 break; 1377 case SCSI_INQUIRY_PAGECODE_BLOCK_LIMITS: 1378 inq_task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1, 1379 SCSI_INQUIRY_PAGECODE_BLOCK_LIMITS, 1380 (void **) &inq_bl, errp); 1381 if (inq_task == NULL) { 1382 ret = -EINVAL; 1383 goto out; 1384 } 1385 memcpy(&iscsilun->bl, inq_bl, 1386 sizeof(struct scsi_inquiry_block_limits)); 1387 scsi_free_scsi_task(inq_task); 1388 break; 1389 default: 1390 break; 1391 } 1392 } 1393 scsi_free_scsi_task(task); 1394 task = NULL; 1395 1396 iscsi_attach_aio_context(bs, iscsilun->aio_context); 1397 1398 /* Guess the internal cluster (page) size of the iscsi target by the means 1399 * of opt_unmap_gran. Transfer the unmap granularity only if it has a 1400 * reasonable size */ 1401 if (iscsilun->bl.opt_unmap_gran * iscsilun->block_size >= 4 * 1024 && 1402 iscsilun->bl.opt_unmap_gran * iscsilun->block_size <= 16 * 1024 * 1024) { 1403 iscsilun->cluster_sectors = (iscsilun->bl.opt_unmap_gran * 1404 iscsilun->block_size) >> BDRV_SECTOR_BITS; 1405 if (iscsilun->lbprz && !(bs->open_flags & BDRV_O_NOCACHE)) { 1406 iscsilun->allocationmap = 1407 bitmap_new(DIV_ROUND_UP(bs->total_sectors, 1408 iscsilun->cluster_sectors)); 1409 } 1410 } 1411 1412 out: 1413 qemu_opts_del(opts); 1414 g_free(initiator_name); 1415 if (iscsi_url != NULL) { 1416 iscsi_destroy_url(iscsi_url); 1417 } 1418 if (task != NULL) { 1419 scsi_free_scsi_task(task); 1420 } 1421 1422 if (ret) { 1423 if (iscsi != NULL) { 1424 iscsi_destroy_context(iscsi); 1425 } 1426 memset(iscsilun, 0, sizeof(IscsiLun)); 1427 } 1428 return ret; 1429 } 1430 1431 static void iscsi_close(BlockDriverState *bs) 1432 { 1433 IscsiLun *iscsilun = bs->opaque; 1434 struct iscsi_context *iscsi = iscsilun->iscsi; 1435 1436 iscsi_detach_aio_context(bs); 1437 iscsi_destroy_context(iscsi); 1438 g_free(iscsilun->zeroblock); 1439 g_free(iscsilun->allocationmap); 1440 memset(iscsilun, 0, sizeof(IscsiLun)); 1441 } 1442 1443 static void iscsi_refresh_limits(BlockDriverState *bs, Error **errp) 1444 { 1445 IscsiLun *iscsilun = bs->opaque; 1446 1447 /* We don't actually refresh here, but just return data queried in 1448 * iscsi_open(): iscsi targets don't change their limits. */ 1449 if (iscsilun->lbp.lbpu) { 1450 if (iscsilun->bl.max_unmap < 0xffffffff) { 1451 bs->bl.max_discard = sector_lun2qemu(iscsilun->bl.max_unmap, 1452 iscsilun); 1453 } 1454 bs->bl.discard_alignment = sector_lun2qemu(iscsilun->bl.opt_unmap_gran, 1455 iscsilun); 1456 } 1457 1458 if (iscsilun->bl.max_ws_len < 0xffffffff) { 1459 bs->bl.max_write_zeroes = sector_lun2qemu(iscsilun->bl.max_ws_len, 1460 iscsilun); 1461 } 1462 if (iscsilun->lbp.lbpws) { 1463 bs->bl.write_zeroes_alignment = sector_lun2qemu(iscsilun->bl.opt_unmap_gran, 1464 iscsilun); 1465 } 1466 bs->bl.opt_transfer_length = sector_lun2qemu(iscsilun->bl.opt_xfer_len, 1467 iscsilun); 1468 } 1469 1470 /* Since iscsi_open() ignores bdrv_flags, there is nothing to do here in 1471 * prepare. Note that this will not re-establish a connection with an iSCSI 1472 * target - it is effectively a NOP. */ 1473 static int iscsi_reopen_prepare(BDRVReopenState *state, 1474 BlockReopenQueue *queue, Error **errp) 1475 { 1476 /* NOP */ 1477 return 0; 1478 } 1479 1480 static int iscsi_truncate(BlockDriverState *bs, int64_t offset) 1481 { 1482 IscsiLun *iscsilun = bs->opaque; 1483 Error *local_err = NULL; 1484 1485 if (iscsilun->type != TYPE_DISK) { 1486 return -ENOTSUP; 1487 } 1488 1489 iscsi_readcapacity_sync(iscsilun, &local_err); 1490 if (local_err != NULL) { 1491 error_free(local_err); 1492 return -EIO; 1493 } 1494 1495 if (offset > iscsi_getlength(bs)) { 1496 return -EINVAL; 1497 } 1498 1499 if (iscsilun->allocationmap != NULL) { 1500 g_free(iscsilun->allocationmap); 1501 iscsilun->allocationmap = 1502 bitmap_new(DIV_ROUND_UP(sector_lun2qemu(iscsilun->num_blocks, 1503 iscsilun), 1504 iscsilun->cluster_sectors)); 1505 } 1506 1507 return 0; 1508 } 1509 1510 static int iscsi_create(const char *filename, QemuOpts *opts, Error **errp) 1511 { 1512 int ret = 0; 1513 int64_t total_size = 0; 1514 BlockDriverState *bs; 1515 IscsiLun *iscsilun = NULL; 1516 QDict *bs_options; 1517 1518 bs = bdrv_new("", &error_abort); 1519 1520 /* Read out options */ 1521 total_size = DIV_ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0), 1522 BDRV_SECTOR_SIZE); 1523 bs->opaque = g_new0(struct IscsiLun, 1); 1524 iscsilun = bs->opaque; 1525 1526 bs_options = qdict_new(); 1527 qdict_put(bs_options, "filename", qstring_from_str(filename)); 1528 ret = iscsi_open(bs, bs_options, 0, NULL); 1529 QDECREF(bs_options); 1530 1531 if (ret != 0) { 1532 goto out; 1533 } 1534 iscsi_detach_aio_context(bs); 1535 if (iscsilun->type != TYPE_DISK) { 1536 ret = -ENODEV; 1537 goto out; 1538 } 1539 if (bs->total_sectors < total_size) { 1540 ret = -ENOSPC; 1541 goto out; 1542 } 1543 1544 ret = 0; 1545 out: 1546 if (iscsilun->iscsi != NULL) { 1547 iscsi_destroy_context(iscsilun->iscsi); 1548 } 1549 g_free(bs->opaque); 1550 bs->opaque = NULL; 1551 bdrv_unref(bs); 1552 return ret; 1553 } 1554 1555 static int iscsi_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) 1556 { 1557 IscsiLun *iscsilun = bs->opaque; 1558 bdi->unallocated_blocks_are_zero = !!iscsilun->lbprz; 1559 bdi->can_write_zeroes_with_unmap = iscsilun->lbprz && iscsilun->lbp.lbpws; 1560 bdi->cluster_size = iscsilun->cluster_sectors * BDRV_SECTOR_SIZE; 1561 return 0; 1562 } 1563 1564 static QemuOptsList iscsi_create_opts = { 1565 .name = "iscsi-create-opts", 1566 .head = QTAILQ_HEAD_INITIALIZER(iscsi_create_opts.head), 1567 .desc = { 1568 { 1569 .name = BLOCK_OPT_SIZE, 1570 .type = QEMU_OPT_SIZE, 1571 .help = "Virtual disk size" 1572 }, 1573 { /* end of list */ } 1574 } 1575 }; 1576 1577 static BlockDriver bdrv_iscsi = { 1578 .format_name = "iscsi", 1579 .protocol_name = "iscsi", 1580 1581 .instance_size = sizeof(IscsiLun), 1582 .bdrv_needs_filename = true, 1583 .bdrv_file_open = iscsi_open, 1584 .bdrv_close = iscsi_close, 1585 .bdrv_create = iscsi_create, 1586 .create_opts = &iscsi_create_opts, 1587 .bdrv_reopen_prepare = iscsi_reopen_prepare, 1588 1589 .bdrv_getlength = iscsi_getlength, 1590 .bdrv_get_info = iscsi_get_info, 1591 .bdrv_truncate = iscsi_truncate, 1592 .bdrv_refresh_limits = iscsi_refresh_limits, 1593 1594 .bdrv_co_get_block_status = iscsi_co_get_block_status, 1595 .bdrv_co_discard = iscsi_co_discard, 1596 .bdrv_co_write_zeroes = iscsi_co_write_zeroes, 1597 .bdrv_co_readv = iscsi_co_readv, 1598 .bdrv_co_writev = iscsi_co_writev, 1599 .bdrv_co_flush_to_disk = iscsi_co_flush, 1600 1601 #ifdef __linux__ 1602 .bdrv_ioctl = iscsi_ioctl, 1603 .bdrv_aio_ioctl = iscsi_aio_ioctl, 1604 #endif 1605 1606 .bdrv_detach_aio_context = iscsi_detach_aio_context, 1607 .bdrv_attach_aio_context = iscsi_attach_aio_context, 1608 }; 1609 1610 static QemuOptsList qemu_iscsi_opts = { 1611 .name = "iscsi", 1612 .head = QTAILQ_HEAD_INITIALIZER(qemu_iscsi_opts.head), 1613 .desc = { 1614 { 1615 .name = "user", 1616 .type = QEMU_OPT_STRING, 1617 .help = "username for CHAP authentication to target", 1618 },{ 1619 .name = "password", 1620 .type = QEMU_OPT_STRING, 1621 .help = "password for CHAP authentication to target", 1622 },{ 1623 .name = "header-digest", 1624 .type = QEMU_OPT_STRING, 1625 .help = "HeaderDigest setting. " 1626 "{CRC32C|CRC32C-NONE|NONE-CRC32C|NONE}", 1627 },{ 1628 .name = "initiator-name", 1629 .type = QEMU_OPT_STRING, 1630 .help = "Initiator iqn name to use when connecting", 1631 }, 1632 { /* end of list */ } 1633 }, 1634 }; 1635 1636 static void iscsi_block_init(void) 1637 { 1638 bdrv_register(&bdrv_iscsi); 1639 qemu_add_opts(&qemu_iscsi_opts); 1640 } 1641 1642 block_init(iscsi_block_init); 1643