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 "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 bool use_16_for_rw; 68 } IscsiLun; 69 70 typedef struct IscsiTask { 71 int status; 72 int complete; 73 int retries; 74 int do_retry; 75 struct scsi_task *task; 76 Coroutine *co; 77 QEMUBH *bh; 78 IscsiLun *iscsilun; 79 QEMUTimer retry_timer; 80 } IscsiTask; 81 82 typedef struct IscsiAIOCB { 83 BlockAIOCB common; 84 QEMUIOVector *qiov; 85 QEMUBH *bh; 86 IscsiLun *iscsilun; 87 struct scsi_task *task; 88 uint8_t *buf; 89 int status; 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 ARRAY_SIZE(iscsi_retry_times) 100 static const unsigned iscsi_retry_times[] = {8, 32, 128, 512, 2048}; 101 102 /* this threshold is a trade-off knob to choose between 103 * the potential additional overhead of an extra GET_LBA_STATUS request 104 * vs. unnecessarily reading a lot of zero sectors over the wire. 105 * If a read request is greater or equal than ISCSI_CHECKALLOC_THRES 106 * sectors we check the allocation status of the area covered by the 107 * request first if the allocationmap indicates that the area might be 108 * unallocated. */ 109 #define ISCSI_CHECKALLOC_THRES 64 110 111 static void 112 iscsi_bh_cb(void *p) 113 { 114 IscsiAIOCB *acb = p; 115 116 qemu_bh_delete(acb->bh); 117 118 g_free(acb->buf); 119 acb->buf = NULL; 120 121 acb->common.cb(acb->common.opaque, acb->status); 122 123 if (acb->task != NULL) { 124 scsi_free_scsi_task(acb->task); 125 acb->task = NULL; 126 } 127 128 qemu_aio_unref(acb); 129 } 130 131 static void 132 iscsi_schedule_bh(IscsiAIOCB *acb) 133 { 134 if (acb->bh) { 135 return; 136 } 137 acb->bh = aio_bh_new(acb->iscsilun->aio_context, iscsi_bh_cb, acb); 138 qemu_bh_schedule(acb->bh); 139 } 140 141 static void iscsi_co_generic_bh_cb(void *opaque) 142 { 143 struct IscsiTask *iTask = opaque; 144 iTask->complete = 1; 145 qemu_bh_delete(iTask->bh); 146 qemu_coroutine_enter(iTask->co, NULL); 147 } 148 149 static void iscsi_retry_timer_expired(void *opaque) 150 { 151 struct IscsiTask *iTask = opaque; 152 iTask->complete = 1; 153 if (iTask->co) { 154 qemu_coroutine_enter(iTask->co, NULL); 155 } 156 } 157 158 static inline unsigned exp_random(double mean) 159 { 160 return -mean * log((double)rand() / RAND_MAX); 161 } 162 163 static void 164 iscsi_co_generic_cb(struct iscsi_context *iscsi, int status, 165 void *command_data, void *opaque) 166 { 167 struct IscsiTask *iTask = opaque; 168 struct scsi_task *task = command_data; 169 170 iTask->status = status; 171 iTask->do_retry = 0; 172 iTask->task = task; 173 174 if (status != SCSI_STATUS_GOOD) { 175 if (iTask->retries++ < ISCSI_CMD_RETRIES) { 176 if (status == SCSI_STATUS_CHECK_CONDITION 177 && task->sense.key == SCSI_SENSE_UNIT_ATTENTION) { 178 error_report("iSCSI CheckCondition: %s", 179 iscsi_get_error(iscsi)); 180 iTask->do_retry = 1; 181 goto out; 182 } 183 if (status == SCSI_STATUS_BUSY) { 184 unsigned retry_time = 185 exp_random(iscsi_retry_times[iTask->retries - 1]); 186 error_report("iSCSI Busy (retry #%u in %u ms): %s", 187 iTask->retries, retry_time, 188 iscsi_get_error(iscsi)); 189 aio_timer_init(iTask->iscsilun->aio_context, 190 &iTask->retry_timer, QEMU_CLOCK_REALTIME, 191 SCALE_MS, iscsi_retry_timer_expired, iTask); 192 timer_mod(&iTask->retry_timer, 193 qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + retry_time); 194 iTask->do_retry = 1; 195 return; 196 } 197 } 198 error_report("iSCSI Failure: %s", iscsi_get_error(iscsi)); 199 } 200 201 out: 202 if (iTask->co) { 203 iTask->bh = aio_bh_new(iTask->iscsilun->aio_context, 204 iscsi_co_generic_bh_cb, iTask); 205 qemu_bh_schedule(iTask->bh); 206 } else { 207 iTask->complete = 1; 208 } 209 } 210 211 static void iscsi_co_init_iscsitask(IscsiLun *iscsilun, struct IscsiTask *iTask) 212 { 213 *iTask = (struct IscsiTask) { 214 .co = qemu_coroutine_self(), 215 .iscsilun = iscsilun, 216 }; 217 } 218 219 static void 220 iscsi_abort_task_cb(struct iscsi_context *iscsi, int status, void *command_data, 221 void *private_data) 222 { 223 IscsiAIOCB *acb = private_data; 224 225 acb->status = -ECANCELED; 226 iscsi_schedule_bh(acb); 227 } 228 229 static void 230 iscsi_aio_cancel(BlockAIOCB *blockacb) 231 { 232 IscsiAIOCB *acb = (IscsiAIOCB *)blockacb; 233 IscsiLun *iscsilun = acb->iscsilun; 234 235 if (acb->status != -EINPROGRESS) { 236 return; 237 } 238 239 /* send a task mgmt call to the target to cancel the task on the target */ 240 iscsi_task_mgmt_abort_task_async(iscsilun->iscsi, acb->task, 241 iscsi_abort_task_cb, acb); 242 243 } 244 245 static const AIOCBInfo iscsi_aiocb_info = { 246 .aiocb_size = sizeof(IscsiAIOCB), 247 .cancel_async = iscsi_aio_cancel, 248 }; 249 250 251 static void iscsi_process_read(void *arg); 252 static void iscsi_process_write(void *arg); 253 254 static void 255 iscsi_set_events(IscsiLun *iscsilun) 256 { 257 struct iscsi_context *iscsi = iscsilun->iscsi; 258 int ev; 259 260 /* We always register a read handler. */ 261 ev = POLLIN; 262 ev |= iscsi_which_events(iscsi); 263 if (ev != iscsilun->events) { 264 aio_set_fd_handler(iscsilun->aio_context, 265 iscsi_get_fd(iscsi), 266 iscsi_process_read, 267 (ev & POLLOUT) ? iscsi_process_write : NULL, 268 iscsilun); 269 270 } 271 272 iscsilun->events = ev; 273 } 274 275 static void 276 iscsi_process_read(void *arg) 277 { 278 IscsiLun *iscsilun = arg; 279 struct iscsi_context *iscsi = iscsilun->iscsi; 280 281 iscsi_service(iscsi, POLLIN); 282 iscsi_set_events(iscsilun); 283 } 284 285 static void 286 iscsi_process_write(void *arg) 287 { 288 IscsiLun *iscsilun = arg; 289 struct iscsi_context *iscsi = iscsilun->iscsi; 290 291 iscsi_service(iscsi, POLLOUT); 292 iscsi_set_events(iscsilun); 293 } 294 295 static int64_t sector_lun2qemu(int64_t sector, IscsiLun *iscsilun) 296 { 297 return sector * iscsilun->block_size / BDRV_SECTOR_SIZE; 298 } 299 300 static int64_t sector_qemu2lun(int64_t sector, IscsiLun *iscsilun) 301 { 302 return sector * BDRV_SECTOR_SIZE / iscsilun->block_size; 303 } 304 305 static bool is_request_lun_aligned(int64_t sector_num, int nb_sectors, 306 IscsiLun *iscsilun) 307 { 308 if ((sector_num * BDRV_SECTOR_SIZE) % iscsilun->block_size || 309 (nb_sectors * BDRV_SECTOR_SIZE) % iscsilun->block_size) { 310 error_report("iSCSI misaligned request: " 311 "iscsilun->block_size %u, sector_num %" PRIi64 312 ", nb_sectors %d", 313 iscsilun->block_size, sector_num, nb_sectors); 314 return 0; 315 } 316 return 1; 317 } 318 319 static unsigned long *iscsi_allocationmap_init(IscsiLun *iscsilun) 320 { 321 return bitmap_try_new(DIV_ROUND_UP(sector_lun2qemu(iscsilun->num_blocks, 322 iscsilun), 323 iscsilun->cluster_sectors)); 324 } 325 326 static void iscsi_allocationmap_set(IscsiLun *iscsilun, int64_t sector_num, 327 int nb_sectors) 328 { 329 if (iscsilun->allocationmap == NULL) { 330 return; 331 } 332 bitmap_set(iscsilun->allocationmap, 333 sector_num / iscsilun->cluster_sectors, 334 DIV_ROUND_UP(nb_sectors, iscsilun->cluster_sectors)); 335 } 336 337 static void iscsi_allocationmap_clear(IscsiLun *iscsilun, int64_t sector_num, 338 int nb_sectors) 339 { 340 int64_t cluster_num, nb_clusters; 341 if (iscsilun->allocationmap == NULL) { 342 return; 343 } 344 cluster_num = DIV_ROUND_UP(sector_num, iscsilun->cluster_sectors); 345 nb_clusters = (sector_num + nb_sectors) / iscsilun->cluster_sectors 346 - cluster_num; 347 if (nb_clusters > 0) { 348 bitmap_clear(iscsilun->allocationmap, cluster_num, nb_clusters); 349 } 350 } 351 352 static int coroutine_fn iscsi_co_writev(BlockDriverState *bs, 353 int64_t sector_num, int nb_sectors, 354 QEMUIOVector *iov) 355 { 356 IscsiLun *iscsilun = bs->opaque; 357 struct IscsiTask iTask; 358 uint64_t lba; 359 uint32_t num_sectors; 360 361 if (!is_request_lun_aligned(sector_num, nb_sectors, iscsilun)) { 362 return -EINVAL; 363 } 364 365 lba = sector_qemu2lun(sector_num, iscsilun); 366 num_sectors = sector_qemu2lun(nb_sectors, iscsilun); 367 iscsi_co_init_iscsitask(iscsilun, &iTask); 368 retry: 369 if (iscsilun->use_16_for_rw) { 370 iTask.task = iscsi_write16_task(iscsilun->iscsi, iscsilun->lun, lba, 371 NULL, num_sectors * iscsilun->block_size, 372 iscsilun->block_size, 0, 0, 0, 0, 0, 373 iscsi_co_generic_cb, &iTask); 374 } else { 375 iTask.task = iscsi_write10_task(iscsilun->iscsi, iscsilun->lun, lba, 376 NULL, num_sectors * iscsilun->block_size, 377 iscsilun->block_size, 0, 0, 0, 0, 0, 378 iscsi_co_generic_cb, &iTask); 379 } 380 if (iTask.task == NULL) { 381 return -ENOMEM; 382 } 383 scsi_task_set_iov_out(iTask.task, (struct scsi_iovec *) iov->iov, 384 iov->niov); 385 while (!iTask.complete) { 386 iscsi_set_events(iscsilun); 387 qemu_coroutine_yield(); 388 } 389 390 if (iTask.task != NULL) { 391 scsi_free_scsi_task(iTask.task); 392 iTask.task = NULL; 393 } 394 395 if (iTask.do_retry) { 396 iTask.complete = 0; 397 goto retry; 398 } 399 400 if (iTask.status != SCSI_STATUS_GOOD) { 401 return -EIO; 402 } 403 404 iscsi_allocationmap_set(iscsilun, sector_num, nb_sectors); 405 406 return 0; 407 } 408 409 410 static bool iscsi_allocationmap_is_allocated(IscsiLun *iscsilun, 411 int64_t sector_num, int nb_sectors) 412 { 413 unsigned long size; 414 if (iscsilun->allocationmap == NULL) { 415 return true; 416 } 417 size = DIV_ROUND_UP(sector_num + nb_sectors, iscsilun->cluster_sectors); 418 return !(find_next_bit(iscsilun->allocationmap, size, 419 sector_num / iscsilun->cluster_sectors) == size); 420 } 421 422 static int64_t coroutine_fn iscsi_co_get_block_status(BlockDriverState *bs, 423 int64_t sector_num, 424 int nb_sectors, int *pnum) 425 { 426 IscsiLun *iscsilun = bs->opaque; 427 struct scsi_get_lba_status *lbas = NULL; 428 struct scsi_lba_status_descriptor *lbasd = NULL; 429 struct IscsiTask iTask; 430 int64_t ret; 431 432 iscsi_co_init_iscsitask(iscsilun, &iTask); 433 434 if (!is_request_lun_aligned(sector_num, nb_sectors, iscsilun)) { 435 ret = -EINVAL; 436 goto out; 437 } 438 439 /* default to all sectors allocated */ 440 ret = BDRV_BLOCK_DATA; 441 ret |= (sector_num << BDRV_SECTOR_BITS) | BDRV_BLOCK_OFFSET_VALID; 442 *pnum = nb_sectors; 443 444 /* LUN does not support logical block provisioning */ 445 if (iscsilun->lbpme == 0) { 446 goto out; 447 } 448 449 retry: 450 if (iscsi_get_lba_status_task(iscsilun->iscsi, iscsilun->lun, 451 sector_qemu2lun(sector_num, iscsilun), 452 8 + 16, iscsi_co_generic_cb, 453 &iTask) == NULL) { 454 ret = -ENOMEM; 455 goto out; 456 } 457 458 while (!iTask.complete) { 459 iscsi_set_events(iscsilun); 460 qemu_coroutine_yield(); 461 } 462 463 if (iTask.do_retry) { 464 if (iTask.task != NULL) { 465 scsi_free_scsi_task(iTask.task); 466 iTask.task = NULL; 467 } 468 iTask.complete = 0; 469 goto retry; 470 } 471 472 if (iTask.status != SCSI_STATUS_GOOD) { 473 /* in case the get_lba_status_callout fails (i.e. 474 * because the device is busy or the cmd is not 475 * supported) we pretend all blocks are allocated 476 * for backwards compatibility */ 477 goto out; 478 } 479 480 lbas = scsi_datain_unmarshall(iTask.task); 481 if (lbas == NULL) { 482 ret = -EIO; 483 goto out; 484 } 485 486 lbasd = &lbas->descriptors[0]; 487 488 if (sector_qemu2lun(sector_num, iscsilun) != lbasd->lba) { 489 ret = -EIO; 490 goto out; 491 } 492 493 *pnum = sector_lun2qemu(lbasd->num_blocks, iscsilun); 494 495 if (lbasd->provisioning == SCSI_PROVISIONING_TYPE_DEALLOCATED || 496 lbasd->provisioning == SCSI_PROVISIONING_TYPE_ANCHORED) { 497 ret &= ~BDRV_BLOCK_DATA; 498 if (iscsilun->lbprz) { 499 ret |= BDRV_BLOCK_ZERO; 500 } 501 } 502 503 if (ret & BDRV_BLOCK_ZERO) { 504 iscsi_allocationmap_clear(iscsilun, sector_num, *pnum); 505 } else { 506 iscsi_allocationmap_set(iscsilun, sector_num, *pnum); 507 } 508 509 if (*pnum > nb_sectors) { 510 *pnum = nb_sectors; 511 } 512 out: 513 if (iTask.task != NULL) { 514 scsi_free_scsi_task(iTask.task); 515 } 516 return ret; 517 } 518 519 static int coroutine_fn iscsi_co_readv(BlockDriverState *bs, 520 int64_t sector_num, int nb_sectors, 521 QEMUIOVector *iov) 522 { 523 IscsiLun *iscsilun = bs->opaque; 524 struct IscsiTask iTask; 525 uint64_t lba; 526 uint32_t num_sectors; 527 528 if (!is_request_lun_aligned(sector_num, nb_sectors, iscsilun)) { 529 return -EINVAL; 530 } 531 532 if (iscsilun->lbprz && nb_sectors >= ISCSI_CHECKALLOC_THRES && 533 !iscsi_allocationmap_is_allocated(iscsilun, sector_num, nb_sectors)) { 534 int64_t ret; 535 int pnum; 536 ret = iscsi_co_get_block_status(bs, sector_num, INT_MAX, &pnum); 537 if (ret < 0) { 538 return ret; 539 } 540 if (ret & BDRV_BLOCK_ZERO && pnum >= nb_sectors) { 541 qemu_iovec_memset(iov, 0, 0x00, iov->size); 542 return 0; 543 } 544 } 545 546 lba = sector_qemu2lun(sector_num, iscsilun); 547 num_sectors = sector_qemu2lun(nb_sectors, iscsilun); 548 549 iscsi_co_init_iscsitask(iscsilun, &iTask); 550 retry: 551 if (iscsilun->use_16_for_rw) { 552 iTask.task = iscsi_read16_task(iscsilun->iscsi, iscsilun->lun, lba, 553 num_sectors * iscsilun->block_size, 554 iscsilun->block_size, 0, 0, 0, 0, 0, 555 iscsi_co_generic_cb, &iTask); 556 } else { 557 iTask.task = iscsi_read10_task(iscsilun->iscsi, iscsilun->lun, lba, 558 num_sectors * iscsilun->block_size, 559 iscsilun->block_size, 560 0, 0, 0, 0, 0, 561 iscsi_co_generic_cb, &iTask); 562 } 563 if (iTask.task == NULL) { 564 return -ENOMEM; 565 } 566 scsi_task_set_iov_in(iTask.task, (struct scsi_iovec *) iov->iov, iov->niov); 567 568 while (!iTask.complete) { 569 iscsi_set_events(iscsilun); 570 qemu_coroutine_yield(); 571 } 572 573 if (iTask.task != NULL) { 574 scsi_free_scsi_task(iTask.task); 575 iTask.task = NULL; 576 } 577 578 if (iTask.do_retry) { 579 iTask.complete = 0; 580 goto retry; 581 } 582 583 if (iTask.status != SCSI_STATUS_GOOD) { 584 return -EIO; 585 } 586 587 return 0; 588 } 589 590 static int coroutine_fn iscsi_co_flush(BlockDriverState *bs) 591 { 592 IscsiLun *iscsilun = bs->opaque; 593 struct IscsiTask iTask; 594 595 if (bs->sg) { 596 return 0; 597 } 598 599 iscsi_co_init_iscsitask(iscsilun, &iTask); 600 601 retry: 602 if (iscsi_synchronizecache10_task(iscsilun->iscsi, iscsilun->lun, 0, 0, 0, 603 0, iscsi_co_generic_cb, &iTask) == NULL) { 604 return -ENOMEM; 605 } 606 607 while (!iTask.complete) { 608 iscsi_set_events(iscsilun); 609 qemu_coroutine_yield(); 610 } 611 612 if (iTask.task != NULL) { 613 scsi_free_scsi_task(iTask.task); 614 iTask.task = NULL; 615 } 616 617 if (iTask.do_retry) { 618 iTask.complete = 0; 619 goto retry; 620 } 621 622 if (iTask.status != SCSI_STATUS_GOOD) { 623 return -EIO; 624 } 625 626 return 0; 627 } 628 629 #ifdef __linux__ 630 static void 631 iscsi_aio_ioctl_cb(struct iscsi_context *iscsi, int status, 632 void *command_data, void *opaque) 633 { 634 IscsiAIOCB *acb = opaque; 635 636 g_free(acb->buf); 637 acb->buf = NULL; 638 639 acb->status = 0; 640 if (status < 0) { 641 error_report("Failed to ioctl(SG_IO) to iSCSI lun. %s", 642 iscsi_get_error(iscsi)); 643 acb->status = -EIO; 644 } 645 646 acb->ioh->driver_status = 0; 647 acb->ioh->host_status = 0; 648 acb->ioh->resid = 0; 649 650 #define SG_ERR_DRIVER_SENSE 0x08 651 652 if (status == SCSI_STATUS_CHECK_CONDITION && acb->task->datain.size >= 2) { 653 int ss; 654 655 acb->ioh->driver_status |= SG_ERR_DRIVER_SENSE; 656 657 acb->ioh->sb_len_wr = acb->task->datain.size - 2; 658 ss = (acb->ioh->mx_sb_len >= acb->ioh->sb_len_wr) ? 659 acb->ioh->mx_sb_len : acb->ioh->sb_len_wr; 660 memcpy(acb->ioh->sbp, &acb->task->datain.data[2], ss); 661 } 662 663 iscsi_schedule_bh(acb); 664 } 665 666 static BlockAIOCB *iscsi_aio_ioctl(BlockDriverState *bs, 667 unsigned long int req, void *buf, 668 BlockCompletionFunc *cb, void *opaque) 669 { 670 IscsiLun *iscsilun = bs->opaque; 671 struct iscsi_context *iscsi = iscsilun->iscsi; 672 struct iscsi_data data; 673 IscsiAIOCB *acb; 674 675 assert(req == SG_IO); 676 677 acb = qemu_aio_get(&iscsi_aiocb_info, bs, cb, opaque); 678 679 acb->iscsilun = iscsilun; 680 acb->bh = NULL; 681 acb->status = -EINPROGRESS; 682 acb->buf = NULL; 683 acb->ioh = buf; 684 685 acb->task = malloc(sizeof(struct scsi_task)); 686 if (acb->task == NULL) { 687 error_report("iSCSI: Failed to allocate task for scsi command. %s", 688 iscsi_get_error(iscsi)); 689 qemu_aio_unref(acb); 690 return NULL; 691 } 692 memset(acb->task, 0, sizeof(struct scsi_task)); 693 694 switch (acb->ioh->dxfer_direction) { 695 case SG_DXFER_TO_DEV: 696 acb->task->xfer_dir = SCSI_XFER_WRITE; 697 break; 698 case SG_DXFER_FROM_DEV: 699 acb->task->xfer_dir = SCSI_XFER_READ; 700 break; 701 default: 702 acb->task->xfer_dir = SCSI_XFER_NONE; 703 break; 704 } 705 706 acb->task->cdb_size = acb->ioh->cmd_len; 707 memcpy(&acb->task->cdb[0], acb->ioh->cmdp, acb->ioh->cmd_len); 708 acb->task->expxferlen = acb->ioh->dxfer_len; 709 710 data.size = 0; 711 if (acb->task->xfer_dir == SCSI_XFER_WRITE) { 712 if (acb->ioh->iovec_count == 0) { 713 data.data = acb->ioh->dxferp; 714 data.size = acb->ioh->dxfer_len; 715 } else { 716 scsi_task_set_iov_out(acb->task, 717 (struct scsi_iovec *) acb->ioh->dxferp, 718 acb->ioh->iovec_count); 719 } 720 } 721 722 if (iscsi_scsi_command_async(iscsi, iscsilun->lun, acb->task, 723 iscsi_aio_ioctl_cb, 724 (data.size > 0) ? &data : NULL, 725 acb) != 0) { 726 scsi_free_scsi_task(acb->task); 727 qemu_aio_unref(acb); 728 return NULL; 729 } 730 731 /* tell libiscsi to read straight into the buffer we got from ioctl */ 732 if (acb->task->xfer_dir == SCSI_XFER_READ) { 733 if (acb->ioh->iovec_count == 0) { 734 scsi_task_add_data_in_buffer(acb->task, 735 acb->ioh->dxfer_len, 736 acb->ioh->dxferp); 737 } else { 738 scsi_task_set_iov_in(acb->task, 739 (struct scsi_iovec *) acb->ioh->dxferp, 740 acb->ioh->iovec_count); 741 } 742 } 743 744 iscsi_set_events(iscsilun); 745 746 return &acb->common; 747 } 748 749 static void ioctl_cb(void *opaque, int status) 750 { 751 int *p_status = opaque; 752 *p_status = status; 753 } 754 755 static int iscsi_ioctl(BlockDriverState *bs, unsigned long int req, void *buf) 756 { 757 IscsiLun *iscsilun = bs->opaque; 758 int status; 759 760 switch (req) { 761 case SG_GET_VERSION_NUM: 762 *(int *)buf = 30000; 763 break; 764 case SG_GET_SCSI_ID: 765 ((struct sg_scsi_id *)buf)->scsi_type = iscsilun->type; 766 break; 767 case SG_IO: 768 status = -EINPROGRESS; 769 iscsi_aio_ioctl(bs, req, buf, ioctl_cb, &status); 770 771 while (status == -EINPROGRESS) { 772 aio_poll(iscsilun->aio_context, true); 773 } 774 775 return 0; 776 default: 777 return -1; 778 } 779 return 0; 780 } 781 #endif 782 783 static int64_t 784 iscsi_getlength(BlockDriverState *bs) 785 { 786 IscsiLun *iscsilun = bs->opaque; 787 int64_t len; 788 789 len = iscsilun->num_blocks; 790 len *= iscsilun->block_size; 791 792 return len; 793 } 794 795 static int 796 coroutine_fn iscsi_co_discard(BlockDriverState *bs, int64_t sector_num, 797 int nb_sectors) 798 { 799 IscsiLun *iscsilun = bs->opaque; 800 struct IscsiTask iTask; 801 struct unmap_list list; 802 803 if (!is_request_lun_aligned(sector_num, nb_sectors, iscsilun)) { 804 return -EINVAL; 805 } 806 807 if (!iscsilun->lbp.lbpu) { 808 /* UNMAP is not supported by the target */ 809 return 0; 810 } 811 812 list.lba = sector_qemu2lun(sector_num, iscsilun); 813 list.num = sector_qemu2lun(nb_sectors, iscsilun); 814 815 iscsi_co_init_iscsitask(iscsilun, &iTask); 816 retry: 817 if (iscsi_unmap_task(iscsilun->iscsi, iscsilun->lun, 0, 0, &list, 1, 818 iscsi_co_generic_cb, &iTask) == NULL) { 819 return -ENOMEM; 820 } 821 822 while (!iTask.complete) { 823 iscsi_set_events(iscsilun); 824 qemu_coroutine_yield(); 825 } 826 827 if (iTask.task != NULL) { 828 scsi_free_scsi_task(iTask.task); 829 iTask.task = NULL; 830 } 831 832 if (iTask.do_retry) { 833 iTask.complete = 0; 834 goto retry; 835 } 836 837 if (iTask.status == SCSI_STATUS_CHECK_CONDITION) { 838 /* the target might fail with a check condition if it 839 is not happy with the alignment of the UNMAP request 840 we silently fail in this case */ 841 return 0; 842 } 843 844 if (iTask.status != SCSI_STATUS_GOOD) { 845 return -EIO; 846 } 847 848 iscsi_allocationmap_clear(iscsilun, sector_num, nb_sectors); 849 850 return 0; 851 } 852 853 static int 854 coroutine_fn iscsi_co_write_zeroes(BlockDriverState *bs, int64_t sector_num, 855 int nb_sectors, BdrvRequestFlags flags) 856 { 857 IscsiLun *iscsilun = bs->opaque; 858 struct IscsiTask iTask; 859 uint64_t lba; 860 uint32_t nb_blocks; 861 bool use_16_for_ws = iscsilun->use_16_for_rw; 862 863 if (!is_request_lun_aligned(sector_num, nb_sectors, iscsilun)) { 864 return -EINVAL; 865 } 866 867 if (flags & BDRV_REQ_MAY_UNMAP) { 868 if (!use_16_for_ws && !iscsilun->lbp.lbpws10) { 869 /* WRITESAME10 with UNMAP is unsupported try WRITESAME16 */ 870 use_16_for_ws = true; 871 } 872 if (use_16_for_ws && !iscsilun->lbp.lbpws) { 873 /* WRITESAME16 with UNMAP is not supported by the target, 874 * fall back and try WRITESAME10/16 without UNMAP */ 875 flags &= ~BDRV_REQ_MAY_UNMAP; 876 use_16_for_ws = iscsilun->use_16_for_rw; 877 } 878 } 879 880 if (!(flags & BDRV_REQ_MAY_UNMAP) && !iscsilun->has_write_same) { 881 /* WRITESAME without UNMAP is not supported by the target */ 882 return -ENOTSUP; 883 } 884 885 lba = sector_qemu2lun(sector_num, iscsilun); 886 nb_blocks = sector_qemu2lun(nb_sectors, iscsilun); 887 888 if (iscsilun->zeroblock == NULL) { 889 iscsilun->zeroblock = g_try_malloc0(iscsilun->block_size); 890 if (iscsilun->zeroblock == NULL) { 891 return -ENOMEM; 892 } 893 } 894 895 iscsi_co_init_iscsitask(iscsilun, &iTask); 896 retry: 897 if (use_16_for_ws) { 898 iTask.task = iscsi_writesame16_task(iscsilun->iscsi, iscsilun->lun, lba, 899 iscsilun->zeroblock, iscsilun->block_size, 900 nb_blocks, 0, !!(flags & BDRV_REQ_MAY_UNMAP), 901 0, 0, iscsi_co_generic_cb, &iTask); 902 } else { 903 iTask.task = iscsi_writesame10_task(iscsilun->iscsi, iscsilun->lun, lba, 904 iscsilun->zeroblock, iscsilun->block_size, 905 nb_blocks, 0, !!(flags & BDRV_REQ_MAY_UNMAP), 906 0, 0, iscsi_co_generic_cb, &iTask); 907 } 908 if (iTask.task == NULL) { 909 return -ENOMEM; 910 } 911 912 while (!iTask.complete) { 913 iscsi_set_events(iscsilun); 914 qemu_coroutine_yield(); 915 } 916 917 if (iTask.status == SCSI_STATUS_CHECK_CONDITION && 918 iTask.task->sense.key == SCSI_SENSE_ILLEGAL_REQUEST && 919 (iTask.task->sense.ascq == SCSI_SENSE_ASCQ_INVALID_OPERATION_CODE || 920 iTask.task->sense.ascq == SCSI_SENSE_ASCQ_INVALID_FIELD_IN_CDB)) { 921 /* WRITE SAME is not supported by the target */ 922 iscsilun->has_write_same = false; 923 scsi_free_scsi_task(iTask.task); 924 return -ENOTSUP; 925 } 926 927 if (iTask.task != NULL) { 928 scsi_free_scsi_task(iTask.task); 929 iTask.task = NULL; 930 } 931 932 if (iTask.do_retry) { 933 iTask.complete = 0; 934 goto retry; 935 } 936 937 if (iTask.status != SCSI_STATUS_GOOD) { 938 return -EIO; 939 } 940 941 if (flags & BDRV_REQ_MAY_UNMAP) { 942 iscsi_allocationmap_clear(iscsilun, sector_num, nb_sectors); 943 } else { 944 iscsi_allocationmap_set(iscsilun, sector_num, nb_sectors); 945 } 946 947 return 0; 948 } 949 950 static void parse_chap(struct iscsi_context *iscsi, const char *target, 951 Error **errp) 952 { 953 QemuOptsList *list; 954 QemuOpts *opts; 955 const char *user = NULL; 956 const char *password = NULL; 957 958 list = qemu_find_opts("iscsi"); 959 if (!list) { 960 return; 961 } 962 963 opts = qemu_opts_find(list, target); 964 if (opts == NULL) { 965 opts = QTAILQ_FIRST(&list->head); 966 if (!opts) { 967 return; 968 } 969 } 970 971 user = qemu_opt_get(opts, "user"); 972 if (!user) { 973 return; 974 } 975 976 password = qemu_opt_get(opts, "password"); 977 if (!password) { 978 error_setg(errp, "CHAP username specified but no password was given"); 979 return; 980 } 981 982 if (iscsi_set_initiator_username_pwd(iscsi, user, password)) { 983 error_setg(errp, "Failed to set initiator username and password"); 984 } 985 } 986 987 static void parse_header_digest(struct iscsi_context *iscsi, const char *target, 988 Error **errp) 989 { 990 QemuOptsList *list; 991 QemuOpts *opts; 992 const char *digest = NULL; 993 994 list = qemu_find_opts("iscsi"); 995 if (!list) { 996 return; 997 } 998 999 opts = qemu_opts_find(list, target); 1000 if (opts == NULL) { 1001 opts = QTAILQ_FIRST(&list->head); 1002 if (!opts) { 1003 return; 1004 } 1005 } 1006 1007 digest = qemu_opt_get(opts, "header-digest"); 1008 if (!digest) { 1009 return; 1010 } 1011 1012 if (!strcmp(digest, "CRC32C")) { 1013 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_CRC32C); 1014 } else if (!strcmp(digest, "NONE")) { 1015 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE); 1016 } else if (!strcmp(digest, "CRC32C-NONE")) { 1017 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_CRC32C_NONE); 1018 } else if (!strcmp(digest, "NONE-CRC32C")) { 1019 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE_CRC32C); 1020 } else { 1021 error_setg(errp, "Invalid header-digest setting : %s", digest); 1022 } 1023 } 1024 1025 static char *parse_initiator_name(const char *target) 1026 { 1027 QemuOptsList *list; 1028 QemuOpts *opts; 1029 const char *name; 1030 char *iscsi_name; 1031 UuidInfo *uuid_info; 1032 1033 list = qemu_find_opts("iscsi"); 1034 if (list) { 1035 opts = qemu_opts_find(list, target); 1036 if (!opts) { 1037 opts = QTAILQ_FIRST(&list->head); 1038 } 1039 if (opts) { 1040 name = qemu_opt_get(opts, "initiator-name"); 1041 if (name) { 1042 return g_strdup(name); 1043 } 1044 } 1045 } 1046 1047 uuid_info = qmp_query_uuid(NULL); 1048 if (strcmp(uuid_info->UUID, UUID_NONE) == 0) { 1049 name = qemu_get_vm_name(); 1050 } else { 1051 name = uuid_info->UUID; 1052 } 1053 iscsi_name = g_strdup_printf("iqn.2008-11.org.linux-kvm%s%s", 1054 name ? ":" : "", name ? name : ""); 1055 qapi_free_UuidInfo(uuid_info); 1056 return iscsi_name; 1057 } 1058 1059 static void iscsi_nop_timed_event(void *opaque) 1060 { 1061 IscsiLun *iscsilun = opaque; 1062 1063 if (iscsi_get_nops_in_flight(iscsilun->iscsi) > MAX_NOP_FAILURES) { 1064 error_report("iSCSI: NOP timeout. Reconnecting..."); 1065 iscsi_reconnect(iscsilun->iscsi); 1066 } 1067 1068 if (iscsi_nop_out_async(iscsilun->iscsi, NULL, NULL, 0, NULL) != 0) { 1069 error_report("iSCSI: failed to sent NOP-Out. Disabling NOP messages."); 1070 return; 1071 } 1072 1073 timer_mod(iscsilun->nop_timer, qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + NOP_INTERVAL); 1074 iscsi_set_events(iscsilun); 1075 } 1076 1077 static void iscsi_readcapacity_sync(IscsiLun *iscsilun, Error **errp) 1078 { 1079 struct scsi_task *task = NULL; 1080 struct scsi_readcapacity10 *rc10 = NULL; 1081 struct scsi_readcapacity16 *rc16 = NULL; 1082 int retries = ISCSI_CMD_RETRIES; 1083 1084 do { 1085 if (task != NULL) { 1086 scsi_free_scsi_task(task); 1087 task = NULL; 1088 } 1089 1090 switch (iscsilun->type) { 1091 case TYPE_DISK: 1092 task = iscsi_readcapacity16_sync(iscsilun->iscsi, iscsilun->lun); 1093 if (task != NULL && task->status == SCSI_STATUS_GOOD) { 1094 rc16 = scsi_datain_unmarshall(task); 1095 if (rc16 == NULL) { 1096 error_setg(errp, "iSCSI: Failed to unmarshall readcapacity16 data."); 1097 } else { 1098 iscsilun->block_size = rc16->block_length; 1099 iscsilun->num_blocks = rc16->returned_lba + 1; 1100 iscsilun->lbpme = rc16->lbpme; 1101 iscsilun->lbprz = rc16->lbprz; 1102 iscsilun->use_16_for_rw = (rc16->returned_lba > 0xffffffff); 1103 } 1104 } 1105 break; 1106 case TYPE_ROM: 1107 task = iscsi_readcapacity10_sync(iscsilun->iscsi, iscsilun->lun, 0, 0); 1108 if (task != NULL && task->status == SCSI_STATUS_GOOD) { 1109 rc10 = scsi_datain_unmarshall(task); 1110 if (rc10 == NULL) { 1111 error_setg(errp, "iSCSI: Failed to unmarshall readcapacity10 data."); 1112 } else { 1113 iscsilun->block_size = rc10->block_size; 1114 if (rc10->lba == 0) { 1115 /* blank disk loaded */ 1116 iscsilun->num_blocks = 0; 1117 } else { 1118 iscsilun->num_blocks = rc10->lba + 1; 1119 } 1120 } 1121 } 1122 break; 1123 default: 1124 return; 1125 } 1126 } while (task != NULL && task->status == SCSI_STATUS_CHECK_CONDITION 1127 && task->sense.key == SCSI_SENSE_UNIT_ATTENTION 1128 && retries-- > 0); 1129 1130 if (task == NULL || task->status != SCSI_STATUS_GOOD) { 1131 error_setg(errp, "iSCSI: failed to send readcapacity10 command."); 1132 } 1133 if (task) { 1134 scsi_free_scsi_task(task); 1135 } 1136 } 1137 1138 /* TODO Convert to fine grained options */ 1139 static QemuOptsList runtime_opts = { 1140 .name = "iscsi", 1141 .head = QTAILQ_HEAD_INITIALIZER(runtime_opts.head), 1142 .desc = { 1143 { 1144 .name = "filename", 1145 .type = QEMU_OPT_STRING, 1146 .help = "URL to the iscsi image", 1147 }, 1148 { /* end of list */ } 1149 }, 1150 }; 1151 1152 static struct scsi_task *iscsi_do_inquiry(struct iscsi_context *iscsi, int lun, 1153 int evpd, int pc, void **inq, Error **errp) 1154 { 1155 int full_size; 1156 struct scsi_task *task = NULL; 1157 task = iscsi_inquiry_sync(iscsi, lun, evpd, pc, 64); 1158 if (task == NULL || task->status != SCSI_STATUS_GOOD) { 1159 goto fail; 1160 } 1161 full_size = scsi_datain_getfullsize(task); 1162 if (full_size > task->datain.size) { 1163 scsi_free_scsi_task(task); 1164 1165 /* we need more data for the full list */ 1166 task = iscsi_inquiry_sync(iscsi, lun, evpd, pc, full_size); 1167 if (task == NULL || task->status != SCSI_STATUS_GOOD) { 1168 goto fail; 1169 } 1170 } 1171 1172 *inq = scsi_datain_unmarshall(task); 1173 if (*inq == NULL) { 1174 error_setg(errp, "iSCSI: failed to unmarshall inquiry datain blob"); 1175 goto fail_with_err; 1176 } 1177 1178 return task; 1179 1180 fail: 1181 error_setg(errp, "iSCSI: Inquiry command failed : %s", 1182 iscsi_get_error(iscsi)); 1183 fail_with_err: 1184 if (task != NULL) { 1185 scsi_free_scsi_task(task); 1186 } 1187 return NULL; 1188 } 1189 1190 static void iscsi_detach_aio_context(BlockDriverState *bs) 1191 { 1192 IscsiLun *iscsilun = bs->opaque; 1193 1194 aio_set_fd_handler(iscsilun->aio_context, 1195 iscsi_get_fd(iscsilun->iscsi), 1196 NULL, NULL, NULL); 1197 iscsilun->events = 0; 1198 1199 if (iscsilun->nop_timer) { 1200 timer_del(iscsilun->nop_timer); 1201 timer_free(iscsilun->nop_timer); 1202 iscsilun->nop_timer = NULL; 1203 } 1204 } 1205 1206 static void iscsi_attach_aio_context(BlockDriverState *bs, 1207 AioContext *new_context) 1208 { 1209 IscsiLun *iscsilun = bs->opaque; 1210 1211 iscsilun->aio_context = new_context; 1212 iscsi_set_events(iscsilun); 1213 1214 /* Set up a timer for sending out iSCSI NOPs */ 1215 iscsilun->nop_timer = aio_timer_new(iscsilun->aio_context, 1216 QEMU_CLOCK_REALTIME, SCALE_MS, 1217 iscsi_nop_timed_event, iscsilun); 1218 timer_mod(iscsilun->nop_timer, 1219 qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + NOP_INTERVAL); 1220 } 1221 1222 static bool iscsi_is_write_protected(IscsiLun *iscsilun) 1223 { 1224 struct scsi_task *task; 1225 struct scsi_mode_sense *ms = NULL; 1226 bool wrprotected = false; 1227 1228 task = iscsi_modesense6_sync(iscsilun->iscsi, iscsilun->lun, 1229 1, SCSI_MODESENSE_PC_CURRENT, 1230 0x3F, 0, 255); 1231 if (task == NULL) { 1232 error_report("iSCSI: Failed to send MODE_SENSE(6) command: %s", 1233 iscsi_get_error(iscsilun->iscsi)); 1234 goto out; 1235 } 1236 1237 if (task->status != SCSI_STATUS_GOOD) { 1238 error_report("iSCSI: Failed MODE_SENSE(6), LUN assumed writable"); 1239 goto out; 1240 } 1241 ms = scsi_datain_unmarshall(task); 1242 if (!ms) { 1243 error_report("iSCSI: Failed to unmarshall MODE_SENSE(6) data: %s", 1244 iscsi_get_error(iscsilun->iscsi)); 1245 goto out; 1246 } 1247 wrprotected = ms->device_specific_parameter & 0x80; 1248 1249 out: 1250 if (task) { 1251 scsi_free_scsi_task(task); 1252 } 1253 return wrprotected; 1254 } 1255 1256 /* 1257 * We support iscsi url's on the form 1258 * iscsi://[<username>%<password>@]<host>[:<port>]/<targetname>/<lun> 1259 * 1260 * Note: flags are currently not used by iscsi_open. If this function 1261 * is changed such that flags are used, please examine iscsi_reopen_prepare() 1262 * to see if needs to be changed as well. 1263 */ 1264 static int iscsi_open(BlockDriverState *bs, QDict *options, int flags, 1265 Error **errp) 1266 { 1267 IscsiLun *iscsilun = bs->opaque; 1268 struct iscsi_context *iscsi = NULL; 1269 struct iscsi_url *iscsi_url = NULL; 1270 struct scsi_task *task = NULL; 1271 struct scsi_inquiry_standard *inq = NULL; 1272 struct scsi_inquiry_supported_pages *inq_vpd; 1273 char *initiator_name = NULL; 1274 QemuOpts *opts; 1275 Error *local_err = NULL; 1276 const char *filename; 1277 int i, ret; 1278 1279 if ((BDRV_SECTOR_SIZE % 512) != 0) { 1280 error_setg(errp, "iSCSI: Invalid BDRV_SECTOR_SIZE. " 1281 "BDRV_SECTOR_SIZE(%lld) is not a multiple " 1282 "of 512", BDRV_SECTOR_SIZE); 1283 return -EINVAL; 1284 } 1285 1286 opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort); 1287 qemu_opts_absorb_qdict(opts, options, &local_err); 1288 if (local_err) { 1289 error_propagate(errp, local_err); 1290 ret = -EINVAL; 1291 goto out; 1292 } 1293 1294 filename = qemu_opt_get(opts, "filename"); 1295 1296 iscsi_url = iscsi_parse_full_url(iscsi, filename); 1297 if (iscsi_url == NULL) { 1298 error_setg(errp, "Failed to parse URL : %s", filename); 1299 ret = -EINVAL; 1300 goto out; 1301 } 1302 1303 memset(iscsilun, 0, sizeof(IscsiLun)); 1304 1305 initiator_name = parse_initiator_name(iscsi_url->target); 1306 1307 iscsi = iscsi_create_context(initiator_name); 1308 if (iscsi == NULL) { 1309 error_setg(errp, "iSCSI: Failed to create iSCSI context."); 1310 ret = -ENOMEM; 1311 goto out; 1312 } 1313 1314 if (iscsi_set_targetname(iscsi, iscsi_url->target)) { 1315 error_setg(errp, "iSCSI: Failed to set target name."); 1316 ret = -EINVAL; 1317 goto out; 1318 } 1319 1320 if (iscsi_url->user != NULL) { 1321 ret = iscsi_set_initiator_username_pwd(iscsi, iscsi_url->user, 1322 iscsi_url->passwd); 1323 if (ret != 0) { 1324 error_setg(errp, "Failed to set initiator username and password"); 1325 ret = -EINVAL; 1326 goto out; 1327 } 1328 } 1329 1330 /* check if we got CHAP username/password via the options */ 1331 parse_chap(iscsi, iscsi_url->target, &local_err); 1332 if (local_err != NULL) { 1333 error_propagate(errp, local_err); 1334 ret = -EINVAL; 1335 goto out; 1336 } 1337 1338 if (iscsi_set_session_type(iscsi, ISCSI_SESSION_NORMAL) != 0) { 1339 error_setg(errp, "iSCSI: Failed to set session type to normal."); 1340 ret = -EINVAL; 1341 goto out; 1342 } 1343 1344 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE_CRC32C); 1345 1346 /* check if we got HEADER_DIGEST via the options */ 1347 parse_header_digest(iscsi, iscsi_url->target, &local_err); 1348 if (local_err != NULL) { 1349 error_propagate(errp, local_err); 1350 ret = -EINVAL; 1351 goto out; 1352 } 1353 1354 if (iscsi_full_connect_sync(iscsi, iscsi_url->portal, iscsi_url->lun) != 0) { 1355 error_setg(errp, "iSCSI: Failed to connect to LUN : %s", 1356 iscsi_get_error(iscsi)); 1357 ret = -EINVAL; 1358 goto out; 1359 } 1360 1361 iscsilun->iscsi = iscsi; 1362 iscsilun->aio_context = bdrv_get_aio_context(bs); 1363 iscsilun->lun = iscsi_url->lun; 1364 iscsilun->has_write_same = true; 1365 1366 task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 0, 0, 1367 (void **) &inq, errp); 1368 if (task == NULL) { 1369 ret = -EINVAL; 1370 goto out; 1371 } 1372 iscsilun->type = inq->periperal_device_type; 1373 scsi_free_scsi_task(task); 1374 task = NULL; 1375 1376 /* Check the write protect flag of the LUN if we want to write */ 1377 if (iscsilun->type == TYPE_DISK && (flags & BDRV_O_RDWR) && 1378 iscsi_is_write_protected(iscsilun)) { 1379 error_setg(errp, "Cannot open a write protected LUN as read-write"); 1380 ret = -EACCES; 1381 goto out; 1382 } 1383 1384 iscsi_readcapacity_sync(iscsilun, &local_err); 1385 if (local_err != NULL) { 1386 error_propagate(errp, local_err); 1387 ret = -EINVAL; 1388 goto out; 1389 } 1390 bs->total_sectors = sector_lun2qemu(iscsilun->num_blocks, iscsilun); 1391 bs->request_alignment = iscsilun->block_size; 1392 1393 /* We don't have any emulation for devices other than disks and CD-ROMs, so 1394 * this must be sg ioctl compatible. We force it to be sg, otherwise qemu 1395 * will try to read from the device to guess the image format. 1396 */ 1397 if (iscsilun->type != TYPE_DISK && iscsilun->type != TYPE_ROM) { 1398 bs->sg = 1; 1399 } 1400 1401 task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1, 1402 SCSI_INQUIRY_PAGECODE_SUPPORTED_VPD_PAGES, 1403 (void **) &inq_vpd, errp); 1404 if (task == NULL) { 1405 ret = -EINVAL; 1406 goto out; 1407 } 1408 for (i = 0; i < inq_vpd->num_pages; i++) { 1409 struct scsi_task *inq_task; 1410 struct scsi_inquiry_logical_block_provisioning *inq_lbp; 1411 struct scsi_inquiry_block_limits *inq_bl; 1412 switch (inq_vpd->pages[i]) { 1413 case SCSI_INQUIRY_PAGECODE_LOGICAL_BLOCK_PROVISIONING: 1414 inq_task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1, 1415 SCSI_INQUIRY_PAGECODE_LOGICAL_BLOCK_PROVISIONING, 1416 (void **) &inq_lbp, errp); 1417 if (inq_task == NULL) { 1418 ret = -EINVAL; 1419 goto out; 1420 } 1421 memcpy(&iscsilun->lbp, inq_lbp, 1422 sizeof(struct scsi_inquiry_logical_block_provisioning)); 1423 scsi_free_scsi_task(inq_task); 1424 break; 1425 case SCSI_INQUIRY_PAGECODE_BLOCK_LIMITS: 1426 inq_task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1, 1427 SCSI_INQUIRY_PAGECODE_BLOCK_LIMITS, 1428 (void **) &inq_bl, errp); 1429 if (inq_task == NULL) { 1430 ret = -EINVAL; 1431 goto out; 1432 } 1433 memcpy(&iscsilun->bl, inq_bl, 1434 sizeof(struct scsi_inquiry_block_limits)); 1435 scsi_free_scsi_task(inq_task); 1436 break; 1437 default: 1438 break; 1439 } 1440 } 1441 scsi_free_scsi_task(task); 1442 task = NULL; 1443 1444 iscsi_attach_aio_context(bs, iscsilun->aio_context); 1445 1446 /* Guess the internal cluster (page) size of the iscsi target by the means 1447 * of opt_unmap_gran. Transfer the unmap granularity only if it has a 1448 * reasonable size */ 1449 if (iscsilun->bl.opt_unmap_gran * iscsilun->block_size >= 4 * 1024 && 1450 iscsilun->bl.opt_unmap_gran * iscsilun->block_size <= 16 * 1024 * 1024) { 1451 iscsilun->cluster_sectors = (iscsilun->bl.opt_unmap_gran * 1452 iscsilun->block_size) >> BDRV_SECTOR_BITS; 1453 if (iscsilun->lbprz && !(bs->open_flags & BDRV_O_NOCACHE)) { 1454 iscsilun->allocationmap = iscsi_allocationmap_init(iscsilun); 1455 if (iscsilun->allocationmap == NULL) { 1456 ret = -ENOMEM; 1457 } 1458 } 1459 } 1460 1461 out: 1462 qemu_opts_del(opts); 1463 g_free(initiator_name); 1464 if (iscsi_url != NULL) { 1465 iscsi_destroy_url(iscsi_url); 1466 } 1467 if (task != NULL) { 1468 scsi_free_scsi_task(task); 1469 } 1470 1471 if (ret) { 1472 if (iscsi != NULL) { 1473 iscsi_destroy_context(iscsi); 1474 } 1475 memset(iscsilun, 0, sizeof(IscsiLun)); 1476 } 1477 return ret; 1478 } 1479 1480 static void iscsi_close(BlockDriverState *bs) 1481 { 1482 IscsiLun *iscsilun = bs->opaque; 1483 struct iscsi_context *iscsi = iscsilun->iscsi; 1484 1485 iscsi_detach_aio_context(bs); 1486 iscsi_destroy_context(iscsi); 1487 g_free(iscsilun->zeroblock); 1488 g_free(iscsilun->allocationmap); 1489 memset(iscsilun, 0, sizeof(IscsiLun)); 1490 } 1491 1492 static void iscsi_refresh_limits(BlockDriverState *bs, Error **errp) 1493 { 1494 IscsiLun *iscsilun = bs->opaque; 1495 1496 /* We don't actually refresh here, but just return data queried in 1497 * iscsi_open(): iscsi targets don't change their limits. */ 1498 if (iscsilun->lbp.lbpu) { 1499 if (iscsilun->bl.max_unmap < 0xffffffff) { 1500 bs->bl.max_discard = sector_lun2qemu(iscsilun->bl.max_unmap, 1501 iscsilun); 1502 } 1503 bs->bl.discard_alignment = sector_lun2qemu(iscsilun->bl.opt_unmap_gran, 1504 iscsilun); 1505 } 1506 1507 if (iscsilun->bl.max_ws_len < 0xffffffff) { 1508 bs->bl.max_write_zeroes = sector_lun2qemu(iscsilun->bl.max_ws_len, 1509 iscsilun); 1510 } 1511 if (iscsilun->lbp.lbpws) { 1512 bs->bl.write_zeroes_alignment = sector_lun2qemu(iscsilun->bl.opt_unmap_gran, 1513 iscsilun); 1514 } 1515 bs->bl.opt_transfer_length = sector_lun2qemu(iscsilun->bl.opt_xfer_len, 1516 iscsilun); 1517 } 1518 1519 /* Since iscsi_open() ignores bdrv_flags, there is nothing to do here in 1520 * prepare. Note that this will not re-establish a connection with an iSCSI 1521 * target - it is effectively a NOP. */ 1522 static int iscsi_reopen_prepare(BDRVReopenState *state, 1523 BlockReopenQueue *queue, Error **errp) 1524 { 1525 /* NOP */ 1526 return 0; 1527 } 1528 1529 static int iscsi_truncate(BlockDriverState *bs, int64_t offset) 1530 { 1531 IscsiLun *iscsilun = bs->opaque; 1532 Error *local_err = NULL; 1533 1534 if (iscsilun->type != TYPE_DISK) { 1535 return -ENOTSUP; 1536 } 1537 1538 iscsi_readcapacity_sync(iscsilun, &local_err); 1539 if (local_err != NULL) { 1540 error_free(local_err); 1541 return -EIO; 1542 } 1543 1544 if (offset > iscsi_getlength(bs)) { 1545 return -EINVAL; 1546 } 1547 1548 if (iscsilun->allocationmap != NULL) { 1549 g_free(iscsilun->allocationmap); 1550 iscsilun->allocationmap = iscsi_allocationmap_init(iscsilun); 1551 } 1552 1553 return 0; 1554 } 1555 1556 static int iscsi_create(const char *filename, QemuOpts *opts, Error **errp) 1557 { 1558 int ret = 0; 1559 int64_t total_size = 0; 1560 BlockDriverState *bs; 1561 IscsiLun *iscsilun = NULL; 1562 QDict *bs_options; 1563 1564 bs = bdrv_new(); 1565 1566 /* Read out options */ 1567 total_size = DIV_ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0), 1568 BDRV_SECTOR_SIZE); 1569 bs->opaque = g_new0(struct IscsiLun, 1); 1570 iscsilun = bs->opaque; 1571 1572 bs_options = qdict_new(); 1573 qdict_put(bs_options, "filename", qstring_from_str(filename)); 1574 ret = iscsi_open(bs, bs_options, 0, NULL); 1575 QDECREF(bs_options); 1576 1577 if (ret != 0) { 1578 goto out; 1579 } 1580 iscsi_detach_aio_context(bs); 1581 if (iscsilun->type != TYPE_DISK) { 1582 ret = -ENODEV; 1583 goto out; 1584 } 1585 if (bs->total_sectors < total_size) { 1586 ret = -ENOSPC; 1587 goto out; 1588 } 1589 1590 ret = 0; 1591 out: 1592 if (iscsilun->iscsi != NULL) { 1593 iscsi_destroy_context(iscsilun->iscsi); 1594 } 1595 g_free(bs->opaque); 1596 bs->opaque = NULL; 1597 bdrv_unref(bs); 1598 return ret; 1599 } 1600 1601 static int iscsi_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) 1602 { 1603 IscsiLun *iscsilun = bs->opaque; 1604 bdi->unallocated_blocks_are_zero = !!iscsilun->lbprz; 1605 bdi->can_write_zeroes_with_unmap = iscsilun->lbprz && iscsilun->lbp.lbpws; 1606 bdi->cluster_size = iscsilun->cluster_sectors * BDRV_SECTOR_SIZE; 1607 return 0; 1608 } 1609 1610 static QemuOptsList iscsi_create_opts = { 1611 .name = "iscsi-create-opts", 1612 .head = QTAILQ_HEAD_INITIALIZER(iscsi_create_opts.head), 1613 .desc = { 1614 { 1615 .name = BLOCK_OPT_SIZE, 1616 .type = QEMU_OPT_SIZE, 1617 .help = "Virtual disk size" 1618 }, 1619 { /* end of list */ } 1620 } 1621 }; 1622 1623 static BlockDriver bdrv_iscsi = { 1624 .format_name = "iscsi", 1625 .protocol_name = "iscsi", 1626 1627 .instance_size = sizeof(IscsiLun), 1628 .bdrv_needs_filename = true, 1629 .bdrv_file_open = iscsi_open, 1630 .bdrv_close = iscsi_close, 1631 .bdrv_create = iscsi_create, 1632 .create_opts = &iscsi_create_opts, 1633 .bdrv_reopen_prepare = iscsi_reopen_prepare, 1634 1635 .bdrv_getlength = iscsi_getlength, 1636 .bdrv_get_info = iscsi_get_info, 1637 .bdrv_truncate = iscsi_truncate, 1638 .bdrv_refresh_limits = iscsi_refresh_limits, 1639 1640 .bdrv_co_get_block_status = iscsi_co_get_block_status, 1641 .bdrv_co_discard = iscsi_co_discard, 1642 .bdrv_co_write_zeroes = iscsi_co_write_zeroes, 1643 .bdrv_co_readv = iscsi_co_readv, 1644 .bdrv_co_writev = iscsi_co_writev, 1645 .bdrv_co_flush_to_disk = iscsi_co_flush, 1646 1647 #ifdef __linux__ 1648 .bdrv_ioctl = iscsi_ioctl, 1649 .bdrv_aio_ioctl = iscsi_aio_ioctl, 1650 #endif 1651 1652 .bdrv_detach_aio_context = iscsi_detach_aio_context, 1653 .bdrv_attach_aio_context = iscsi_attach_aio_context, 1654 }; 1655 1656 static QemuOptsList qemu_iscsi_opts = { 1657 .name = "iscsi", 1658 .head = QTAILQ_HEAD_INITIALIZER(qemu_iscsi_opts.head), 1659 .desc = { 1660 { 1661 .name = "user", 1662 .type = QEMU_OPT_STRING, 1663 .help = "username for CHAP authentication to target", 1664 },{ 1665 .name = "password", 1666 .type = QEMU_OPT_STRING, 1667 .help = "password for CHAP authentication to target", 1668 },{ 1669 .name = "header-digest", 1670 .type = QEMU_OPT_STRING, 1671 .help = "HeaderDigest setting. " 1672 "{CRC32C|CRC32C-NONE|NONE-CRC32C|NONE}", 1673 },{ 1674 .name = "initiator-name", 1675 .type = QEMU_OPT_STRING, 1676 .help = "Initiator iqn name to use when connecting", 1677 }, 1678 { /* end of list */ } 1679 }, 1680 }; 1681 1682 static void iscsi_block_init(void) 1683 { 1684 bdrv_register(&bdrv_iscsi); 1685 qemu_add_opts(&qemu_iscsi_opts); 1686 } 1687 1688 block_init(iscsi_block_init); 1689