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