1 /* 2 * QEMU Block driver for iSCSI images 3 * 4 * Copyright (c) 2010-2011 Ronnie Sahlberg <ronniesahlberg@gmail.com> 5 * Copyright (c) 2012-2013 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 "block/block_int.h" 34 #include "trace.h" 35 #include "block/scsi.h" 36 #include "qemu/iov.h" 37 #include "sysemu/sysemu.h" 38 #include "qmp-commands.h" 39 40 #include <iscsi/iscsi.h> 41 #include <iscsi/scsi-lowlevel.h> 42 43 #ifdef __linux__ 44 #include <scsi/sg.h> 45 #include <block/scsi.h> 46 #endif 47 48 typedef struct IscsiLun { 49 struct iscsi_context *iscsi; 50 int lun; 51 enum scsi_inquiry_peripheral_device_type type; 52 int block_size; 53 uint64_t num_blocks; 54 int events; 55 QEMUTimer *nop_timer; 56 uint8_t lbpme; 57 uint8_t lbprz; 58 uint8_t has_write_same; 59 struct scsi_inquiry_logical_block_provisioning lbp; 60 struct scsi_inquiry_block_limits bl; 61 unsigned char *zeroblock; 62 } IscsiLun; 63 64 typedef struct IscsiTask { 65 int status; 66 int complete; 67 int retries; 68 int do_retry; 69 struct scsi_task *task; 70 Coroutine *co; 71 } IscsiTask; 72 73 typedef struct IscsiAIOCB { 74 BlockDriverAIOCB common; 75 QEMUIOVector *qiov; 76 QEMUBH *bh; 77 IscsiLun *iscsilun; 78 struct scsi_task *task; 79 uint8_t *buf; 80 int status; 81 int canceled; 82 int retries; 83 int64_t sector_num; 84 int nb_sectors; 85 #ifdef __linux__ 86 sg_io_hdr_t *ioh; 87 #endif 88 } IscsiAIOCB; 89 90 #define NOP_INTERVAL 5000 91 #define MAX_NOP_FAILURES 3 92 #define ISCSI_CMD_RETRIES 5 93 94 static void 95 iscsi_bh_cb(void *p) 96 { 97 IscsiAIOCB *acb = p; 98 99 qemu_bh_delete(acb->bh); 100 101 g_free(acb->buf); 102 acb->buf = NULL; 103 104 if (acb->canceled == 0) { 105 acb->common.cb(acb->common.opaque, acb->status); 106 } 107 108 if (acb->task != NULL) { 109 scsi_free_scsi_task(acb->task); 110 acb->task = NULL; 111 } 112 113 qemu_aio_release(acb); 114 } 115 116 static void 117 iscsi_schedule_bh(IscsiAIOCB *acb) 118 { 119 if (acb->bh) { 120 return; 121 } 122 acb->bh = qemu_bh_new(iscsi_bh_cb, acb); 123 qemu_bh_schedule(acb->bh); 124 } 125 126 static void 127 iscsi_co_generic_cb(struct iscsi_context *iscsi, int status, 128 void *command_data, void *opaque) 129 { 130 struct IscsiTask *iTask = opaque; 131 struct scsi_task *task = command_data; 132 133 iTask->complete = 1; 134 iTask->status = status; 135 iTask->do_retry = 0; 136 iTask->task = task; 137 138 if (iTask->retries-- > 0 && status == SCSI_STATUS_CHECK_CONDITION 139 && task->sense.key == SCSI_SENSE_UNIT_ATTENTION) { 140 iTask->do_retry = 1; 141 goto out; 142 } 143 144 if (status != SCSI_STATUS_GOOD) { 145 error_report("iSCSI: Failure. %s", iscsi_get_error(iscsi)); 146 } 147 148 out: 149 if (iTask->co) { 150 qemu_coroutine_enter(iTask->co, NULL); 151 } 152 } 153 154 static void iscsi_co_init_iscsitask(IscsiLun *iscsilun, struct IscsiTask *iTask) 155 { 156 *iTask = (struct IscsiTask) { 157 .co = qemu_coroutine_self(), 158 .retries = ISCSI_CMD_RETRIES, 159 }; 160 } 161 162 static void 163 iscsi_abort_task_cb(struct iscsi_context *iscsi, int status, void *command_data, 164 void *private_data) 165 { 166 IscsiAIOCB *acb = private_data; 167 168 acb->status = -ECANCELED; 169 iscsi_schedule_bh(acb); 170 } 171 172 static void 173 iscsi_aio_cancel(BlockDriverAIOCB *blockacb) 174 { 175 IscsiAIOCB *acb = (IscsiAIOCB *)blockacb; 176 IscsiLun *iscsilun = acb->iscsilun; 177 178 if (acb->status != -EINPROGRESS) { 179 return; 180 } 181 182 acb->canceled = 1; 183 184 /* send a task mgmt call to the target to cancel the task on the target */ 185 iscsi_task_mgmt_abort_task_async(iscsilun->iscsi, acb->task, 186 iscsi_abort_task_cb, acb); 187 188 while (acb->status == -EINPROGRESS) { 189 qemu_aio_wait(); 190 } 191 } 192 193 static const AIOCBInfo iscsi_aiocb_info = { 194 .aiocb_size = sizeof(IscsiAIOCB), 195 .cancel = iscsi_aio_cancel, 196 }; 197 198 199 static void iscsi_process_read(void *arg); 200 static void iscsi_process_write(void *arg); 201 202 static void 203 iscsi_set_events(IscsiLun *iscsilun) 204 { 205 struct iscsi_context *iscsi = iscsilun->iscsi; 206 int ev; 207 208 /* We always register a read handler. */ 209 ev = POLLIN; 210 ev |= iscsi_which_events(iscsi); 211 if (ev != iscsilun->events) { 212 qemu_aio_set_fd_handler(iscsi_get_fd(iscsi), 213 iscsi_process_read, 214 (ev & POLLOUT) ? iscsi_process_write : NULL, 215 iscsilun); 216 217 } 218 219 iscsilun->events = ev; 220 } 221 222 static void 223 iscsi_process_read(void *arg) 224 { 225 IscsiLun *iscsilun = arg; 226 struct iscsi_context *iscsi = iscsilun->iscsi; 227 228 iscsi_service(iscsi, POLLIN); 229 iscsi_set_events(iscsilun); 230 } 231 232 static void 233 iscsi_process_write(void *arg) 234 { 235 IscsiLun *iscsilun = arg; 236 struct iscsi_context *iscsi = iscsilun->iscsi; 237 238 iscsi_service(iscsi, POLLOUT); 239 iscsi_set_events(iscsilun); 240 } 241 242 static int64_t sector_lun2qemu(int64_t sector, IscsiLun *iscsilun) 243 { 244 return sector * iscsilun->block_size / BDRV_SECTOR_SIZE; 245 } 246 247 static int64_t sector_qemu2lun(int64_t sector, IscsiLun *iscsilun) 248 { 249 return sector * BDRV_SECTOR_SIZE / iscsilun->block_size; 250 } 251 252 static bool is_request_lun_aligned(int64_t sector_num, int nb_sectors, 253 IscsiLun *iscsilun) 254 { 255 if ((sector_num * BDRV_SECTOR_SIZE) % iscsilun->block_size || 256 (nb_sectors * BDRV_SECTOR_SIZE) % iscsilun->block_size) { 257 error_report("iSCSI misaligned request: " 258 "iscsilun->block_size %u, sector_num %" PRIi64 259 ", nb_sectors %d", 260 iscsilun->block_size, sector_num, nb_sectors); 261 return 0; 262 } 263 return 1; 264 } 265 266 static int coroutine_fn iscsi_co_writev(BlockDriverState *bs, 267 int64_t sector_num, int nb_sectors, 268 QEMUIOVector *iov) 269 { 270 IscsiLun *iscsilun = bs->opaque; 271 struct IscsiTask iTask; 272 uint64_t lba; 273 uint32_t num_sectors; 274 uint8_t *data = NULL; 275 uint8_t *buf = NULL; 276 277 if (!is_request_lun_aligned(sector_num, nb_sectors, iscsilun)) { 278 return -EINVAL; 279 } 280 281 lba = sector_qemu2lun(sector_num, iscsilun); 282 num_sectors = sector_qemu2lun(nb_sectors, iscsilun); 283 #if !defined(LIBISCSI_FEATURE_IOVECTOR) 284 /* if the iovec only contains one buffer we can pass it directly */ 285 if (iov->niov == 1) { 286 data = iov->iov[0].iov_base; 287 } else { 288 size_t size = MIN(nb_sectors * BDRV_SECTOR_SIZE, iov->size); 289 buf = g_malloc(size); 290 qemu_iovec_to_buf(iov, 0, buf, size); 291 data = buf; 292 } 293 #endif 294 iscsi_co_init_iscsitask(iscsilun, &iTask); 295 retry: 296 iTask.task = iscsi_write16_task(iscsilun->iscsi, iscsilun->lun, lba, 297 data, num_sectors * iscsilun->block_size, 298 iscsilun->block_size, 0, 0, 0, 0, 0, 299 iscsi_co_generic_cb, &iTask); 300 if (iTask.task == NULL) { 301 g_free(buf); 302 return -EIO; 303 } 304 #if defined(LIBISCSI_FEATURE_IOVECTOR) 305 scsi_task_set_iov_out(iTask.task, (struct scsi_iovec *) iov->iov, 306 iov->niov); 307 #endif 308 while (!iTask.complete) { 309 iscsi_set_events(iscsilun); 310 qemu_coroutine_yield(); 311 } 312 313 if (iTask.task != NULL) { 314 scsi_free_scsi_task(iTask.task); 315 iTask.task = NULL; 316 } 317 318 if (iTask.do_retry) { 319 goto retry; 320 } 321 322 g_free(buf); 323 324 if (iTask.status != SCSI_STATUS_GOOD) { 325 return -EIO; 326 } 327 328 return 0; 329 } 330 331 static int coroutine_fn iscsi_co_readv(BlockDriverState *bs, 332 int64_t sector_num, int nb_sectors, 333 QEMUIOVector *iov) 334 { 335 IscsiLun *iscsilun = bs->opaque; 336 struct IscsiTask iTask; 337 uint64_t lba; 338 uint32_t num_sectors; 339 #if !defined(LIBISCSI_FEATURE_IOVECTOR) 340 int i; 341 #endif 342 343 if (!is_request_lun_aligned(sector_num, nb_sectors, iscsilun)) { 344 return -EINVAL; 345 } 346 347 lba = sector_qemu2lun(sector_num, iscsilun); 348 num_sectors = sector_qemu2lun(nb_sectors, iscsilun); 349 350 iscsi_co_init_iscsitask(iscsilun, &iTask); 351 retry: 352 switch (iscsilun->type) { 353 case TYPE_DISK: 354 iTask.task = iscsi_read16_task(iscsilun->iscsi, iscsilun->lun, lba, 355 num_sectors * iscsilun->block_size, 356 iscsilun->block_size, 0, 0, 0, 0, 0, 357 iscsi_co_generic_cb, &iTask); 358 break; 359 default: 360 iTask.task = iscsi_read10_task(iscsilun->iscsi, iscsilun->lun, lba, 361 num_sectors * iscsilun->block_size, 362 iscsilun->block_size, 0, 0, 0, 0, 0, 363 iscsi_co_generic_cb, &iTask); 364 break; 365 } 366 if (iTask.task == NULL) { 367 return -EIO; 368 } 369 #if defined(LIBISCSI_FEATURE_IOVECTOR) 370 scsi_task_set_iov_in(iTask.task, (struct scsi_iovec *) iov->iov, iov->niov); 371 #else 372 for (i = 0; i < iov->niov; i++) { 373 scsi_task_add_data_in_buffer(iTask.task, 374 iov->iov[i].iov_len, 375 iov->iov[i].iov_base); 376 } 377 #endif 378 379 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 goto retry; 391 } 392 393 if (iTask.status != SCSI_STATUS_GOOD) { 394 return -EIO; 395 } 396 397 return 0; 398 } 399 400 static int coroutine_fn iscsi_co_flush(BlockDriverState *bs) 401 { 402 IscsiLun *iscsilun = bs->opaque; 403 struct IscsiTask iTask; 404 405 iscsi_co_init_iscsitask(iscsilun, &iTask); 406 407 retry: 408 if (iscsi_synchronizecache10_task(iscsilun->iscsi, iscsilun->lun, 0, 0, 0, 409 0, iscsi_co_generic_cb, &iTask) == NULL) { 410 return -EIO; 411 } 412 413 while (!iTask.complete) { 414 iscsi_set_events(iscsilun); 415 qemu_coroutine_yield(); 416 } 417 418 if (iTask.task != NULL) { 419 scsi_free_scsi_task(iTask.task); 420 iTask.task = NULL; 421 } 422 423 if (iTask.do_retry) { 424 goto retry; 425 } 426 427 if (iTask.status != SCSI_STATUS_GOOD) { 428 return -EIO; 429 } 430 431 return 0; 432 } 433 434 #ifdef __linux__ 435 static void 436 iscsi_aio_ioctl_cb(struct iscsi_context *iscsi, int status, 437 void *command_data, void *opaque) 438 { 439 IscsiAIOCB *acb = opaque; 440 441 g_free(acb->buf); 442 acb->buf = NULL; 443 444 if (acb->canceled != 0) { 445 return; 446 } 447 448 acb->status = 0; 449 if (status < 0) { 450 error_report("Failed to ioctl(SG_IO) to iSCSI lun. %s", 451 iscsi_get_error(iscsi)); 452 acb->status = -EIO; 453 } 454 455 acb->ioh->driver_status = 0; 456 acb->ioh->host_status = 0; 457 acb->ioh->resid = 0; 458 459 #define SG_ERR_DRIVER_SENSE 0x08 460 461 if (status == SCSI_STATUS_CHECK_CONDITION && acb->task->datain.size >= 2) { 462 int ss; 463 464 acb->ioh->driver_status |= SG_ERR_DRIVER_SENSE; 465 466 acb->ioh->sb_len_wr = acb->task->datain.size - 2; 467 ss = (acb->ioh->mx_sb_len >= acb->ioh->sb_len_wr) ? 468 acb->ioh->mx_sb_len : acb->ioh->sb_len_wr; 469 memcpy(acb->ioh->sbp, &acb->task->datain.data[2], ss); 470 } 471 472 iscsi_schedule_bh(acb); 473 } 474 475 static BlockDriverAIOCB *iscsi_aio_ioctl(BlockDriverState *bs, 476 unsigned long int req, void *buf, 477 BlockDriverCompletionFunc *cb, void *opaque) 478 { 479 IscsiLun *iscsilun = bs->opaque; 480 struct iscsi_context *iscsi = iscsilun->iscsi; 481 struct iscsi_data data; 482 IscsiAIOCB *acb; 483 484 assert(req == SG_IO); 485 486 acb = qemu_aio_get(&iscsi_aiocb_info, bs, cb, opaque); 487 488 acb->iscsilun = iscsilun; 489 acb->canceled = 0; 490 acb->bh = NULL; 491 acb->status = -EINPROGRESS; 492 acb->buf = NULL; 493 acb->ioh = buf; 494 495 acb->task = malloc(sizeof(struct scsi_task)); 496 if (acb->task == NULL) { 497 error_report("iSCSI: Failed to allocate task for scsi command. %s", 498 iscsi_get_error(iscsi)); 499 qemu_aio_release(acb); 500 return NULL; 501 } 502 memset(acb->task, 0, sizeof(struct scsi_task)); 503 504 switch (acb->ioh->dxfer_direction) { 505 case SG_DXFER_TO_DEV: 506 acb->task->xfer_dir = SCSI_XFER_WRITE; 507 break; 508 case SG_DXFER_FROM_DEV: 509 acb->task->xfer_dir = SCSI_XFER_READ; 510 break; 511 default: 512 acb->task->xfer_dir = SCSI_XFER_NONE; 513 break; 514 } 515 516 acb->task->cdb_size = acb->ioh->cmd_len; 517 memcpy(&acb->task->cdb[0], acb->ioh->cmdp, acb->ioh->cmd_len); 518 acb->task->expxferlen = acb->ioh->dxfer_len; 519 520 data.size = 0; 521 if (acb->task->xfer_dir == SCSI_XFER_WRITE) { 522 if (acb->ioh->iovec_count == 0) { 523 data.data = acb->ioh->dxferp; 524 data.size = acb->ioh->dxfer_len; 525 } else { 526 #if defined(LIBISCSI_FEATURE_IOVECTOR) 527 scsi_task_set_iov_out(acb->task, 528 (struct scsi_iovec *) acb->ioh->dxferp, 529 acb->ioh->iovec_count); 530 #else 531 struct iovec *iov = (struct iovec *)acb->ioh->dxferp; 532 533 acb->buf = g_malloc(acb->ioh->dxfer_len); 534 data.data = acb->buf; 535 data.size = iov_to_buf(iov, acb->ioh->iovec_count, 0, 536 acb->buf, acb->ioh->dxfer_len); 537 #endif 538 } 539 } 540 541 if (iscsi_scsi_command_async(iscsi, iscsilun->lun, acb->task, 542 iscsi_aio_ioctl_cb, 543 (data.size > 0) ? &data : NULL, 544 acb) != 0) { 545 scsi_free_scsi_task(acb->task); 546 qemu_aio_release(acb); 547 return NULL; 548 } 549 550 /* tell libiscsi to read straight into the buffer we got from ioctl */ 551 if (acb->task->xfer_dir == SCSI_XFER_READ) { 552 if (acb->ioh->iovec_count == 0) { 553 scsi_task_add_data_in_buffer(acb->task, 554 acb->ioh->dxfer_len, 555 acb->ioh->dxferp); 556 } else { 557 #if defined(LIBISCSI_FEATURE_IOVECTOR) 558 scsi_task_set_iov_in(acb->task, 559 (struct scsi_iovec *) acb->ioh->dxferp, 560 acb->ioh->iovec_count); 561 #else 562 int i; 563 for (i = 0; i < acb->ioh->iovec_count; i++) { 564 struct iovec *iov = (struct iovec *)acb->ioh->dxferp; 565 566 scsi_task_add_data_in_buffer(acb->task, 567 iov[i].iov_len, 568 iov[i].iov_base); 569 } 570 #endif 571 } 572 } 573 574 iscsi_set_events(iscsilun); 575 576 return &acb->common; 577 } 578 579 580 static void ioctl_cb(void *opaque, int status) 581 { 582 int *p_status = opaque; 583 *p_status = status; 584 } 585 586 static int iscsi_ioctl(BlockDriverState *bs, unsigned long int req, void *buf) 587 { 588 IscsiLun *iscsilun = bs->opaque; 589 int status; 590 591 switch (req) { 592 case SG_GET_VERSION_NUM: 593 *(int *)buf = 30000; 594 break; 595 case SG_GET_SCSI_ID: 596 ((struct sg_scsi_id *)buf)->scsi_type = iscsilun->type; 597 break; 598 case SG_IO: 599 status = -EINPROGRESS; 600 iscsi_aio_ioctl(bs, req, buf, ioctl_cb, &status); 601 602 while (status == -EINPROGRESS) { 603 qemu_aio_wait(); 604 } 605 606 return 0; 607 default: 608 return -1; 609 } 610 return 0; 611 } 612 #endif 613 614 static int64_t 615 iscsi_getlength(BlockDriverState *bs) 616 { 617 IscsiLun *iscsilun = bs->opaque; 618 int64_t len; 619 620 len = iscsilun->num_blocks; 621 len *= iscsilun->block_size; 622 623 return len; 624 } 625 626 #if defined(LIBISCSI_FEATURE_IOVECTOR) 627 628 static int64_t coroutine_fn iscsi_co_get_block_status(BlockDriverState *bs, 629 int64_t sector_num, 630 int nb_sectors, int *pnum) 631 { 632 IscsiLun *iscsilun = bs->opaque; 633 struct scsi_get_lba_status *lbas = NULL; 634 struct scsi_lba_status_descriptor *lbasd = NULL; 635 struct IscsiTask iTask; 636 int64_t ret; 637 638 iscsi_co_init_iscsitask(iscsilun, &iTask); 639 640 if (!is_request_lun_aligned(sector_num, nb_sectors, iscsilun)) { 641 ret = -EINVAL; 642 goto out; 643 } 644 645 /* default to all sectors allocated */ 646 ret = BDRV_BLOCK_DATA; 647 ret |= (sector_num << BDRV_SECTOR_BITS) | BDRV_BLOCK_OFFSET_VALID; 648 *pnum = nb_sectors; 649 650 /* LUN does not support logical block provisioning */ 651 if (iscsilun->lbpme == 0) { 652 goto out; 653 } 654 655 retry: 656 if (iscsi_get_lba_status_task(iscsilun->iscsi, iscsilun->lun, 657 sector_qemu2lun(sector_num, iscsilun), 658 8 + 16, iscsi_co_generic_cb, 659 &iTask) == NULL) { 660 ret = -EIO; 661 goto out; 662 } 663 664 while (!iTask.complete) { 665 iscsi_set_events(iscsilun); 666 qemu_coroutine_yield(); 667 } 668 669 if (iTask.do_retry) { 670 if (iTask.task != NULL) { 671 scsi_free_scsi_task(iTask.task); 672 iTask.task = NULL; 673 } 674 goto retry; 675 } 676 677 if (iTask.status != SCSI_STATUS_GOOD) { 678 /* in case the get_lba_status_callout fails (i.e. 679 * because the device is busy or the cmd is not 680 * supported) we pretend all blocks are allocated 681 * for backwards compatibility */ 682 goto out; 683 } 684 685 lbas = scsi_datain_unmarshall(iTask.task); 686 if (lbas == NULL) { 687 ret = -EIO; 688 goto out; 689 } 690 691 lbasd = &lbas->descriptors[0]; 692 693 if (sector_qemu2lun(sector_num, iscsilun) != lbasd->lba) { 694 ret = -EIO; 695 goto out; 696 } 697 698 *pnum = sector_lun2qemu(lbasd->num_blocks, iscsilun); 699 if (*pnum > nb_sectors) { 700 *pnum = nb_sectors; 701 } 702 703 if (lbasd->provisioning == SCSI_PROVISIONING_TYPE_DEALLOCATED || 704 lbasd->provisioning == SCSI_PROVISIONING_TYPE_ANCHORED) { 705 ret &= ~BDRV_BLOCK_DATA; 706 if (iscsilun->lbprz) { 707 ret |= BDRV_BLOCK_ZERO; 708 } 709 } 710 711 out: 712 if (iTask.task != NULL) { 713 scsi_free_scsi_task(iTask.task); 714 } 715 return ret; 716 } 717 718 #endif /* LIBISCSI_FEATURE_IOVECTOR */ 719 720 static int 721 coroutine_fn iscsi_co_discard(BlockDriverState *bs, int64_t sector_num, 722 int nb_sectors) 723 { 724 IscsiLun *iscsilun = bs->opaque; 725 struct IscsiTask iTask; 726 struct unmap_list list; 727 728 if (!is_request_lun_aligned(sector_num, nb_sectors, iscsilun)) { 729 return -EINVAL; 730 } 731 732 if (!iscsilun->lbp.lbpu) { 733 /* UNMAP is not supported by the target */ 734 return 0; 735 } 736 737 list.lba = sector_qemu2lun(sector_num, iscsilun); 738 list.num = sector_qemu2lun(nb_sectors, iscsilun); 739 740 iscsi_co_init_iscsitask(iscsilun, &iTask); 741 retry: 742 if (iscsi_unmap_task(iscsilun->iscsi, iscsilun->lun, 0, 0, &list, 1, 743 iscsi_co_generic_cb, &iTask) == NULL) { 744 return -EIO; 745 } 746 747 while (!iTask.complete) { 748 iscsi_set_events(iscsilun); 749 qemu_coroutine_yield(); 750 } 751 752 if (iTask.task != NULL) { 753 scsi_free_scsi_task(iTask.task); 754 iTask.task = NULL; 755 } 756 757 if (iTask.do_retry) { 758 goto retry; 759 } 760 761 if (iTask.status == SCSI_STATUS_CHECK_CONDITION) { 762 /* the target might fail with a check condition if it 763 is not happy with the alignment of the UNMAP request 764 we silently fail in this case */ 765 return 0; 766 } 767 768 if (iTask.status != SCSI_STATUS_GOOD) { 769 return -EIO; 770 } 771 772 return 0; 773 } 774 775 #if defined(SCSI_SENSE_ASCQ_CAPACITY_DATA_HAS_CHANGED) 776 777 static int 778 coroutine_fn iscsi_co_write_zeroes(BlockDriverState *bs, int64_t sector_num, 779 int nb_sectors, BdrvRequestFlags flags) 780 { 781 IscsiLun *iscsilun = bs->opaque; 782 struct IscsiTask iTask; 783 uint64_t lba; 784 uint32_t nb_blocks; 785 786 if (!is_request_lun_aligned(sector_num, nb_sectors, iscsilun)) { 787 return -EINVAL; 788 } 789 790 if (!(flags & BDRV_REQ_MAY_UNMAP) && !iscsilun->has_write_same) { 791 /* WRITE SAME without UNMAP is not supported by the target */ 792 return -ENOTSUP; 793 } 794 795 if ((flags & BDRV_REQ_MAY_UNMAP) && !iscsilun->lbp.lbpws) { 796 /* WRITE SAME with UNMAP is not supported by the target */ 797 return -ENOTSUP; 798 } 799 800 lba = sector_qemu2lun(sector_num, iscsilun); 801 nb_blocks = sector_qemu2lun(nb_sectors, iscsilun); 802 803 if (iscsilun->zeroblock == NULL) { 804 iscsilun->zeroblock = g_malloc0(iscsilun->block_size); 805 } 806 807 iscsi_co_init_iscsitask(iscsilun, &iTask); 808 retry: 809 if (iscsi_writesame16_task(iscsilun->iscsi, iscsilun->lun, lba, 810 iscsilun->zeroblock, iscsilun->block_size, 811 nb_blocks, 0, !!(flags & BDRV_REQ_MAY_UNMAP), 812 0, 0, iscsi_co_generic_cb, &iTask) == NULL) { 813 return -EIO; 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 goto retry; 828 } 829 830 if (iTask.status != SCSI_STATUS_GOOD) { 831 if (iTask.status == SCSI_STATUS_CHECK_CONDITION && 832 iTask.task->sense.key == SCSI_SENSE_ILLEGAL_REQUEST && 833 iTask.task->sense.ascq == SCSI_SENSE_ASCQ_INVALID_OPERATION_CODE) { 834 /* WRITE SAME is not supported by the target */ 835 iscsilun->has_write_same = false; 836 return -ENOTSUP; 837 } 838 839 return -EIO; 840 } 841 842 return 0; 843 } 844 845 #endif /* SCSI_SENSE_ASCQ_CAPACITY_DATA_HAS_CHANGED */ 846 847 static int parse_chap(struct iscsi_context *iscsi, const char *target) 848 { 849 QemuOptsList *list; 850 QemuOpts *opts; 851 const char *user = NULL; 852 const char *password = NULL; 853 854 list = qemu_find_opts("iscsi"); 855 if (!list) { 856 return 0; 857 } 858 859 opts = qemu_opts_find(list, target); 860 if (opts == NULL) { 861 opts = QTAILQ_FIRST(&list->head); 862 if (!opts) { 863 return 0; 864 } 865 } 866 867 user = qemu_opt_get(opts, "user"); 868 if (!user) { 869 return 0; 870 } 871 872 password = qemu_opt_get(opts, "password"); 873 if (!password) { 874 error_report("CHAP username specified but no password was given"); 875 return -1; 876 } 877 878 if (iscsi_set_initiator_username_pwd(iscsi, user, password)) { 879 error_report("Failed to set initiator username and password"); 880 return -1; 881 } 882 883 return 0; 884 } 885 886 static void parse_header_digest(struct iscsi_context *iscsi, const char *target) 887 { 888 QemuOptsList *list; 889 QemuOpts *opts; 890 const char *digest = NULL; 891 892 list = qemu_find_opts("iscsi"); 893 if (!list) { 894 return; 895 } 896 897 opts = qemu_opts_find(list, target); 898 if (opts == NULL) { 899 opts = QTAILQ_FIRST(&list->head); 900 if (!opts) { 901 return; 902 } 903 } 904 905 digest = qemu_opt_get(opts, "header-digest"); 906 if (!digest) { 907 return; 908 } 909 910 if (!strcmp(digest, "CRC32C")) { 911 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_CRC32C); 912 } else if (!strcmp(digest, "NONE")) { 913 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE); 914 } else if (!strcmp(digest, "CRC32C-NONE")) { 915 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_CRC32C_NONE); 916 } else if (!strcmp(digest, "NONE-CRC32C")) { 917 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE_CRC32C); 918 } else { 919 error_report("Invalid header-digest setting : %s", digest); 920 } 921 } 922 923 static char *parse_initiator_name(const char *target) 924 { 925 QemuOptsList *list; 926 QemuOpts *opts; 927 const char *name; 928 char *iscsi_name; 929 UuidInfo *uuid_info; 930 931 list = qemu_find_opts("iscsi"); 932 if (list) { 933 opts = qemu_opts_find(list, target); 934 if (!opts) { 935 opts = QTAILQ_FIRST(&list->head); 936 } 937 if (opts) { 938 name = qemu_opt_get(opts, "initiator-name"); 939 if (name) { 940 return g_strdup(name); 941 } 942 } 943 } 944 945 uuid_info = qmp_query_uuid(NULL); 946 if (strcmp(uuid_info->UUID, UUID_NONE) == 0) { 947 name = qemu_get_vm_name(); 948 } else { 949 name = uuid_info->UUID; 950 } 951 iscsi_name = g_strdup_printf("iqn.2008-11.org.linux-kvm%s%s", 952 name ? ":" : "", name ? name : ""); 953 qapi_free_UuidInfo(uuid_info); 954 return iscsi_name; 955 } 956 957 #if defined(LIBISCSI_FEATURE_NOP_COUNTER) 958 static void iscsi_nop_timed_event(void *opaque) 959 { 960 IscsiLun *iscsilun = opaque; 961 962 if (iscsi_get_nops_in_flight(iscsilun->iscsi) > MAX_NOP_FAILURES) { 963 error_report("iSCSI: NOP timeout. Reconnecting..."); 964 iscsi_reconnect(iscsilun->iscsi); 965 } 966 967 if (iscsi_nop_out_async(iscsilun->iscsi, NULL, NULL, 0, NULL) != 0) { 968 error_report("iSCSI: failed to sent NOP-Out. Disabling NOP messages."); 969 return; 970 } 971 972 timer_mod(iscsilun->nop_timer, qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + NOP_INTERVAL); 973 iscsi_set_events(iscsilun); 974 } 975 #endif 976 977 static int iscsi_readcapacity_sync(IscsiLun *iscsilun) 978 { 979 struct scsi_task *task = NULL; 980 struct scsi_readcapacity10 *rc10 = NULL; 981 struct scsi_readcapacity16 *rc16 = NULL; 982 int ret = 0; 983 int retries = ISCSI_CMD_RETRIES; 984 985 do { 986 if (task != NULL) { 987 scsi_free_scsi_task(task); 988 task = NULL; 989 } 990 991 switch (iscsilun->type) { 992 case TYPE_DISK: 993 task = iscsi_readcapacity16_sync(iscsilun->iscsi, iscsilun->lun); 994 if (task != NULL && task->status == SCSI_STATUS_GOOD) { 995 rc16 = scsi_datain_unmarshall(task); 996 if (rc16 == NULL) { 997 error_report("iSCSI: Failed to unmarshall readcapacity16 data."); 998 ret = -EINVAL; 999 } else { 1000 iscsilun->block_size = rc16->block_length; 1001 iscsilun->num_blocks = rc16->returned_lba + 1; 1002 iscsilun->lbpme = rc16->lbpme; 1003 iscsilun->lbprz = rc16->lbprz; 1004 } 1005 } 1006 break; 1007 case TYPE_ROM: 1008 task = iscsi_readcapacity10_sync(iscsilun->iscsi, iscsilun->lun, 0, 0); 1009 if (task != NULL && task->status == SCSI_STATUS_GOOD) { 1010 rc10 = scsi_datain_unmarshall(task); 1011 if (rc10 == NULL) { 1012 error_report("iSCSI: Failed to unmarshall readcapacity10 data."); 1013 ret = -EINVAL; 1014 } else { 1015 iscsilun->block_size = rc10->block_size; 1016 if (rc10->lba == 0) { 1017 /* blank disk loaded */ 1018 iscsilun->num_blocks = 0; 1019 } else { 1020 iscsilun->num_blocks = rc10->lba + 1; 1021 } 1022 } 1023 } 1024 break; 1025 default: 1026 return 0; 1027 } 1028 } while (task != NULL && task->status == SCSI_STATUS_CHECK_CONDITION 1029 && task->sense.key == SCSI_SENSE_UNIT_ATTENTION 1030 && retries-- > 0); 1031 1032 if (task == NULL || task->status != SCSI_STATUS_GOOD) { 1033 error_report("iSCSI: failed to send readcapacity10 command."); 1034 ret = -EINVAL; 1035 } 1036 if (task) { 1037 scsi_free_scsi_task(task); 1038 } 1039 return ret; 1040 } 1041 1042 /* TODO Convert to fine grained options */ 1043 static QemuOptsList runtime_opts = { 1044 .name = "iscsi", 1045 .head = QTAILQ_HEAD_INITIALIZER(runtime_opts.head), 1046 .desc = { 1047 { 1048 .name = "filename", 1049 .type = QEMU_OPT_STRING, 1050 .help = "URL to the iscsi image", 1051 }, 1052 { /* end of list */ } 1053 }, 1054 }; 1055 1056 static struct scsi_task *iscsi_do_inquiry(struct iscsi_context *iscsi, 1057 int lun, int evpd, int pc) { 1058 int full_size; 1059 struct scsi_task *task = NULL; 1060 task = iscsi_inquiry_sync(iscsi, lun, evpd, pc, 64); 1061 if (task == NULL || task->status != SCSI_STATUS_GOOD) { 1062 goto fail; 1063 } 1064 full_size = scsi_datain_getfullsize(task); 1065 if (full_size > task->datain.size) { 1066 scsi_free_scsi_task(task); 1067 1068 /* we need more data for the full list */ 1069 task = iscsi_inquiry_sync(iscsi, lun, evpd, pc, full_size); 1070 if (task == NULL || task->status != SCSI_STATUS_GOOD) { 1071 goto fail; 1072 } 1073 } 1074 1075 return task; 1076 1077 fail: 1078 error_report("iSCSI: Inquiry command failed : %s", 1079 iscsi_get_error(iscsi)); 1080 if (task) { 1081 scsi_free_scsi_task(task); 1082 return NULL; 1083 } 1084 return NULL; 1085 } 1086 1087 /* 1088 * We support iscsi url's on the form 1089 * iscsi://[<username>%<password>@]<host>[:<port>]/<targetname>/<lun> 1090 */ 1091 static int iscsi_open(BlockDriverState *bs, QDict *options, int flags, 1092 Error **errp) 1093 { 1094 IscsiLun *iscsilun = bs->opaque; 1095 struct iscsi_context *iscsi = NULL; 1096 struct iscsi_url *iscsi_url = NULL; 1097 struct scsi_task *task = NULL; 1098 struct scsi_inquiry_standard *inq = NULL; 1099 char *initiator_name = NULL; 1100 QemuOpts *opts; 1101 Error *local_err = NULL; 1102 const char *filename; 1103 int ret; 1104 1105 if ((BDRV_SECTOR_SIZE % 512) != 0) { 1106 error_report("iSCSI: Invalid BDRV_SECTOR_SIZE. " 1107 "BDRV_SECTOR_SIZE(%lld) is not a multiple " 1108 "of 512", BDRV_SECTOR_SIZE); 1109 return -EINVAL; 1110 } 1111 1112 opts = qemu_opts_create_nofail(&runtime_opts); 1113 qemu_opts_absorb_qdict(opts, options, &local_err); 1114 if (error_is_set(&local_err)) { 1115 qerror_report_err(local_err); 1116 error_free(local_err); 1117 ret = -EINVAL; 1118 goto out; 1119 } 1120 1121 filename = qemu_opt_get(opts, "filename"); 1122 1123 1124 iscsi_url = iscsi_parse_full_url(iscsi, filename); 1125 if (iscsi_url == NULL) { 1126 error_report("Failed to parse URL : %s", filename); 1127 ret = -EINVAL; 1128 goto out; 1129 } 1130 1131 memset(iscsilun, 0, sizeof(IscsiLun)); 1132 1133 initiator_name = parse_initiator_name(iscsi_url->target); 1134 1135 iscsi = iscsi_create_context(initiator_name); 1136 if (iscsi == NULL) { 1137 error_report("iSCSI: Failed to create iSCSI context."); 1138 ret = -ENOMEM; 1139 goto out; 1140 } 1141 1142 if (iscsi_set_targetname(iscsi, iscsi_url->target)) { 1143 error_report("iSCSI: Failed to set target name."); 1144 ret = -EINVAL; 1145 goto out; 1146 } 1147 1148 if (iscsi_url->user != NULL) { 1149 ret = iscsi_set_initiator_username_pwd(iscsi, iscsi_url->user, 1150 iscsi_url->passwd); 1151 if (ret != 0) { 1152 error_report("Failed to set initiator username and password"); 1153 ret = -EINVAL; 1154 goto out; 1155 } 1156 } 1157 1158 /* check if we got CHAP username/password via the options */ 1159 if (parse_chap(iscsi, iscsi_url->target) != 0) { 1160 error_report("iSCSI: Failed to set CHAP user/password"); 1161 ret = -EINVAL; 1162 goto out; 1163 } 1164 1165 if (iscsi_set_session_type(iscsi, ISCSI_SESSION_NORMAL) != 0) { 1166 error_report("iSCSI: Failed to set session type to normal."); 1167 ret = -EINVAL; 1168 goto out; 1169 } 1170 1171 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE_CRC32C); 1172 1173 /* check if we got HEADER_DIGEST via the options */ 1174 parse_header_digest(iscsi, iscsi_url->target); 1175 1176 if (iscsi_full_connect_sync(iscsi, iscsi_url->portal, iscsi_url->lun) != 0) { 1177 error_report("iSCSI: Failed to connect to LUN : %s", 1178 iscsi_get_error(iscsi)); 1179 ret = -EINVAL; 1180 goto out; 1181 } 1182 1183 iscsilun->iscsi = iscsi; 1184 iscsilun->lun = iscsi_url->lun; 1185 1186 task = iscsi_inquiry_sync(iscsi, iscsilun->lun, 0, 0, 36); 1187 1188 if (task == NULL || task->status != SCSI_STATUS_GOOD) { 1189 error_report("iSCSI: failed to send inquiry command."); 1190 ret = -EINVAL; 1191 goto out; 1192 } 1193 1194 inq = scsi_datain_unmarshall(task); 1195 if (inq == NULL) { 1196 error_report("iSCSI: Failed to unmarshall inquiry data."); 1197 ret = -EINVAL; 1198 goto out; 1199 } 1200 1201 iscsilun->type = inq->periperal_device_type; 1202 iscsilun->has_write_same = true; 1203 1204 if ((ret = iscsi_readcapacity_sync(iscsilun)) != 0) { 1205 goto out; 1206 } 1207 bs->total_sectors = sector_lun2qemu(iscsilun->num_blocks, iscsilun); 1208 1209 /* Medium changer or tape. We dont have any emulation for this so this must 1210 * be sg ioctl compatible. We force it to be sg, otherwise qemu will try 1211 * to read from the device to guess the image format. 1212 */ 1213 if (iscsilun->type == TYPE_MEDIUM_CHANGER || 1214 iscsilun->type == TYPE_TAPE) { 1215 bs->sg = 1; 1216 } 1217 1218 if (iscsilun->lbpme) { 1219 struct scsi_inquiry_logical_block_provisioning *inq_lbp; 1220 task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1, 1221 SCSI_INQUIRY_PAGECODE_LOGICAL_BLOCK_PROVISIONING); 1222 if (task == NULL) { 1223 ret = -EINVAL; 1224 goto out; 1225 } 1226 inq_lbp = scsi_datain_unmarshall(task); 1227 if (inq_lbp == NULL) { 1228 error_report("iSCSI: failed to unmarshall inquiry datain blob"); 1229 ret = -EINVAL; 1230 goto out; 1231 } 1232 memcpy(&iscsilun->lbp, inq_lbp, 1233 sizeof(struct scsi_inquiry_logical_block_provisioning)); 1234 scsi_free_scsi_task(task); 1235 task = NULL; 1236 } 1237 1238 if (iscsilun->lbp.lbpu || iscsilun->lbp.lbpws) { 1239 struct scsi_inquiry_block_limits *inq_bl; 1240 task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1, 1241 SCSI_INQUIRY_PAGECODE_BLOCK_LIMITS); 1242 if (task == NULL) { 1243 ret = -EINVAL; 1244 goto out; 1245 } 1246 inq_bl = scsi_datain_unmarshall(task); 1247 if (inq_bl == NULL) { 1248 error_report("iSCSI: failed to unmarshall inquiry datain blob"); 1249 ret = -EINVAL; 1250 goto out; 1251 } 1252 memcpy(&iscsilun->bl, inq_bl, 1253 sizeof(struct scsi_inquiry_block_limits)); 1254 scsi_free_scsi_task(task); 1255 task = NULL; 1256 1257 if (iscsilun->bl.max_unmap < 0xffffffff) { 1258 bs->bl.max_discard = sector_lun2qemu(iscsilun->bl.max_unmap, 1259 iscsilun); 1260 } 1261 bs->bl.discard_alignment = sector_lun2qemu(iscsilun->bl.opt_unmap_gran, 1262 iscsilun); 1263 1264 if (iscsilun->bl.max_ws_len < 0xffffffff) { 1265 bs->bl.max_write_zeroes = sector_lun2qemu(iscsilun->bl.max_ws_len, 1266 iscsilun); 1267 } 1268 bs->bl.write_zeroes_alignment = sector_lun2qemu(iscsilun->bl.opt_unmap_gran, 1269 iscsilun); 1270 1271 bs->bl.opt_transfer_length = sector_lun2qemu(iscsilun->bl.opt_xfer_len, 1272 iscsilun); 1273 } 1274 1275 #if defined(LIBISCSI_FEATURE_NOP_COUNTER) 1276 /* Set up a timer for sending out iSCSI NOPs */ 1277 iscsilun->nop_timer = timer_new_ms(QEMU_CLOCK_REALTIME, iscsi_nop_timed_event, iscsilun); 1278 timer_mod(iscsilun->nop_timer, qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + NOP_INTERVAL); 1279 #endif 1280 1281 out: 1282 qemu_opts_del(opts); 1283 if (initiator_name != NULL) { 1284 g_free(initiator_name); 1285 } 1286 if (iscsi_url != NULL) { 1287 iscsi_destroy_url(iscsi_url); 1288 } 1289 if (task != NULL) { 1290 scsi_free_scsi_task(task); 1291 } 1292 1293 if (ret) { 1294 if (iscsi != NULL) { 1295 iscsi_destroy_context(iscsi); 1296 } 1297 memset(iscsilun, 0, sizeof(IscsiLun)); 1298 } 1299 return ret; 1300 } 1301 1302 static void iscsi_close(BlockDriverState *bs) 1303 { 1304 IscsiLun *iscsilun = bs->opaque; 1305 struct iscsi_context *iscsi = iscsilun->iscsi; 1306 1307 if (iscsilun->nop_timer) { 1308 timer_del(iscsilun->nop_timer); 1309 timer_free(iscsilun->nop_timer); 1310 } 1311 qemu_aio_set_fd_handler(iscsi_get_fd(iscsi), NULL, NULL, NULL); 1312 iscsi_destroy_context(iscsi); 1313 g_free(iscsilun->zeroblock); 1314 memset(iscsilun, 0, sizeof(IscsiLun)); 1315 } 1316 1317 static int iscsi_truncate(BlockDriverState *bs, int64_t offset) 1318 { 1319 IscsiLun *iscsilun = bs->opaque; 1320 int ret = 0; 1321 1322 if (iscsilun->type != TYPE_DISK) { 1323 return -ENOTSUP; 1324 } 1325 1326 if ((ret = iscsi_readcapacity_sync(iscsilun)) != 0) { 1327 return ret; 1328 } 1329 1330 if (offset > iscsi_getlength(bs)) { 1331 return -EINVAL; 1332 } 1333 1334 return 0; 1335 } 1336 1337 static int iscsi_create(const char *filename, QEMUOptionParameter *options, 1338 Error **errp) 1339 { 1340 int ret = 0; 1341 int64_t total_size = 0; 1342 BlockDriverState *bs; 1343 IscsiLun *iscsilun = NULL; 1344 QDict *bs_options; 1345 1346 bs = bdrv_new(""); 1347 1348 /* Read out options */ 1349 while (options && options->name) { 1350 if (!strcmp(options->name, "size")) { 1351 total_size = options->value.n / BDRV_SECTOR_SIZE; 1352 } 1353 options++; 1354 } 1355 1356 bs->opaque = g_malloc0(sizeof(struct IscsiLun)); 1357 iscsilun = bs->opaque; 1358 1359 bs_options = qdict_new(); 1360 qdict_put(bs_options, "filename", qstring_from_str(filename)); 1361 ret = iscsi_open(bs, bs_options, 0, NULL); 1362 QDECREF(bs_options); 1363 1364 if (ret != 0) { 1365 goto out; 1366 } 1367 if (iscsilun->nop_timer) { 1368 timer_del(iscsilun->nop_timer); 1369 timer_free(iscsilun->nop_timer); 1370 } 1371 if (iscsilun->type != TYPE_DISK) { 1372 ret = -ENODEV; 1373 goto out; 1374 } 1375 if (bs->total_sectors < total_size) { 1376 ret = -ENOSPC; 1377 goto out; 1378 } 1379 1380 ret = 0; 1381 out: 1382 if (iscsilun->iscsi != NULL) { 1383 iscsi_destroy_context(iscsilun->iscsi); 1384 } 1385 g_free(bs->opaque); 1386 bs->opaque = NULL; 1387 bdrv_unref(bs); 1388 return ret; 1389 } 1390 1391 static int iscsi_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) 1392 { 1393 IscsiLun *iscsilun = bs->opaque; 1394 bdi->unallocated_blocks_are_zero = !!iscsilun->lbprz; 1395 bdi->can_write_zeroes_with_unmap = iscsilun->lbprz && iscsilun->lbp.lbpws; 1396 /* Guess the internal cluster (page) size of the iscsi target by the means 1397 * of opt_unmap_gran. Transfer the unmap granularity only if it has a 1398 * reasonable size for bdi->cluster_size */ 1399 if (iscsilun->bl.opt_unmap_gran * iscsilun->block_size >= 64 * 1024 && 1400 iscsilun->bl.opt_unmap_gran * iscsilun->block_size <= 16 * 1024 * 1024) { 1401 bdi->cluster_size = iscsilun->bl.opt_unmap_gran * iscsilun->block_size; 1402 } 1403 return 0; 1404 } 1405 1406 static QEMUOptionParameter iscsi_create_options[] = { 1407 { 1408 .name = BLOCK_OPT_SIZE, 1409 .type = OPT_SIZE, 1410 .help = "Virtual disk size" 1411 }, 1412 { NULL } 1413 }; 1414 1415 static BlockDriver bdrv_iscsi = { 1416 .format_name = "iscsi", 1417 .protocol_name = "iscsi", 1418 1419 .instance_size = sizeof(IscsiLun), 1420 .bdrv_needs_filename = true, 1421 .bdrv_file_open = iscsi_open, 1422 .bdrv_close = iscsi_close, 1423 .bdrv_create = iscsi_create, 1424 .create_options = iscsi_create_options, 1425 1426 .bdrv_getlength = iscsi_getlength, 1427 .bdrv_get_info = iscsi_get_info, 1428 .bdrv_truncate = iscsi_truncate, 1429 1430 #if defined(LIBISCSI_FEATURE_IOVECTOR) 1431 .bdrv_co_get_block_status = iscsi_co_get_block_status, 1432 #endif 1433 .bdrv_co_discard = iscsi_co_discard, 1434 #if defined(SCSI_SENSE_ASCQ_CAPACITY_DATA_HAS_CHANGED) 1435 .bdrv_co_write_zeroes = iscsi_co_write_zeroes, 1436 #endif 1437 .bdrv_co_readv = iscsi_co_readv, 1438 .bdrv_co_writev = iscsi_co_writev, 1439 .bdrv_co_flush_to_disk = iscsi_co_flush, 1440 1441 #ifdef __linux__ 1442 .bdrv_ioctl = iscsi_ioctl, 1443 .bdrv_aio_ioctl = iscsi_aio_ioctl, 1444 #endif 1445 }; 1446 1447 static QemuOptsList qemu_iscsi_opts = { 1448 .name = "iscsi", 1449 .head = QTAILQ_HEAD_INITIALIZER(qemu_iscsi_opts.head), 1450 .desc = { 1451 { 1452 .name = "user", 1453 .type = QEMU_OPT_STRING, 1454 .help = "username for CHAP authentication to target", 1455 },{ 1456 .name = "password", 1457 .type = QEMU_OPT_STRING, 1458 .help = "password for CHAP authentication to target", 1459 },{ 1460 .name = "header-digest", 1461 .type = QEMU_OPT_STRING, 1462 .help = "HeaderDigest setting. " 1463 "{CRC32C|CRC32C-NONE|NONE-CRC32C|NONE}", 1464 },{ 1465 .name = "initiator-name", 1466 .type = QEMU_OPT_STRING, 1467 .help = "Initiator iqn name to use when connecting", 1468 }, 1469 { /* end of list */ } 1470 }, 1471 }; 1472 1473 static void iscsi_block_init(void) 1474 { 1475 bdrv_register(&bdrv_iscsi); 1476 qemu_add_opts(&qemu_iscsi_opts); 1477 } 1478 1479 block_init(iscsi_block_init); 1480