1 /* 2 * QEMU Block driver for iSCSI images 3 * 4 * Copyright (c) 2010-2011 Ronnie Sahlberg <ronniesahlberg@gmail.com> 5 * 6 * Permission is hereby granted, free of charge, to any person obtaining a copy 7 * of this software and associated documentation files (the "Software"), to deal 8 * in the Software without restriction, including without limitation the rights 9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 10 * copies of the Software, and to permit persons to whom the Software is 11 * furnished to do so, subject to the following conditions: 12 * 13 * The above copyright notice and this permission notice shall be included in 14 * all copies or substantial portions of the Software. 15 * 16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 22 * THE SOFTWARE. 23 */ 24 25 #include "config-host.h" 26 27 #include <poll.h> 28 #include <arpa/inet.h> 29 #include "qemu-common.h" 30 #include "qemu/config-file.h" 31 #include "qemu/error-report.h" 32 #include "block/block_int.h" 33 #include "trace.h" 34 #include "block/scsi.h" 35 #include "qemu/iov.h" 36 #include "sysemu/sysemu.h" 37 #include "qmp-commands.h" 38 39 #include <iscsi/iscsi.h> 40 #include <iscsi/scsi-lowlevel.h> 41 42 #ifdef __linux__ 43 #include <scsi/sg.h> 44 #include <block/scsi.h> 45 #endif 46 47 typedef struct IscsiLun { 48 struct iscsi_context *iscsi; 49 int lun; 50 enum scsi_inquiry_peripheral_device_type type; 51 int block_size; 52 uint64_t num_blocks; 53 int events; 54 QEMUTimer *nop_timer; 55 uint8_t lbpme; 56 uint8_t lbprz; 57 struct scsi_inquiry_logical_block_provisioning lbp; 58 struct scsi_inquiry_block_limits bl; 59 } IscsiLun; 60 61 typedef struct IscsiTask { 62 int status; 63 int complete; 64 int retries; 65 int do_retry; 66 struct scsi_task *task; 67 Coroutine *co; 68 } IscsiTask; 69 70 typedef struct IscsiAIOCB { 71 BlockDriverAIOCB common; 72 QEMUIOVector *qiov; 73 QEMUBH *bh; 74 IscsiLun *iscsilun; 75 struct scsi_task *task; 76 uint8_t *buf; 77 int status; 78 int canceled; 79 int retries; 80 int64_t sector_num; 81 int nb_sectors; 82 #ifdef __linux__ 83 sg_io_hdr_t *ioh; 84 #endif 85 } IscsiAIOCB; 86 87 #define NOP_INTERVAL 5000 88 #define MAX_NOP_FAILURES 3 89 #define ISCSI_CMD_RETRIES 5 90 #define ISCSI_MAX_UNMAP 131072 91 92 static void 93 iscsi_bh_cb(void *p) 94 { 95 IscsiAIOCB *acb = p; 96 97 qemu_bh_delete(acb->bh); 98 99 g_free(acb->buf); 100 acb->buf = NULL; 101 102 if (acb->canceled == 0) { 103 acb->common.cb(acb->common.opaque, acb->status); 104 } 105 106 if (acb->task != NULL) { 107 scsi_free_scsi_task(acb->task); 108 acb->task = NULL; 109 } 110 111 qemu_aio_release(acb); 112 } 113 114 static void 115 iscsi_schedule_bh(IscsiAIOCB *acb) 116 { 117 if (acb->bh) { 118 return; 119 } 120 acb->bh = qemu_bh_new(iscsi_bh_cb, acb); 121 qemu_bh_schedule(acb->bh); 122 } 123 124 static void 125 iscsi_co_generic_cb(struct iscsi_context *iscsi, int status, 126 void *command_data, void *opaque) 127 { 128 struct IscsiTask *iTask = opaque; 129 struct scsi_task *task = command_data; 130 131 iTask->complete = 1; 132 iTask->status = status; 133 iTask->do_retry = 0; 134 iTask->task = task; 135 136 if (iTask->retries-- > 0 && status == SCSI_STATUS_CHECK_CONDITION 137 && task->sense.key == SCSI_SENSE_UNIT_ATTENTION) { 138 iTask->do_retry = 1; 139 goto out; 140 } 141 142 if (status != SCSI_STATUS_GOOD) { 143 error_report("iSCSI: Failure. %s", iscsi_get_error(iscsi)); 144 } 145 146 out: 147 if (iTask->co) { 148 qemu_coroutine_enter(iTask->co, NULL); 149 } 150 } 151 152 static void iscsi_co_init_iscsitask(IscsiLun *iscsilun, struct IscsiTask *iTask) 153 { 154 *iTask = (struct IscsiTask) { 155 .co = qemu_coroutine_self(), 156 .retries = ISCSI_CMD_RETRIES, 157 }; 158 } 159 160 static void 161 iscsi_abort_task_cb(struct iscsi_context *iscsi, int status, void *command_data, 162 void *private_data) 163 { 164 IscsiAIOCB *acb = private_data; 165 166 acb->status = -ECANCELED; 167 iscsi_schedule_bh(acb); 168 } 169 170 static void 171 iscsi_aio_cancel(BlockDriverAIOCB *blockacb) 172 { 173 IscsiAIOCB *acb = (IscsiAIOCB *)blockacb; 174 IscsiLun *iscsilun = acb->iscsilun; 175 176 if (acb->status != -EINPROGRESS) { 177 return; 178 } 179 180 acb->canceled = 1; 181 182 /* send a task mgmt call to the target to cancel the task on the target */ 183 iscsi_task_mgmt_abort_task_async(iscsilun->iscsi, acb->task, 184 iscsi_abort_task_cb, acb); 185 186 while (acb->status == -EINPROGRESS) { 187 qemu_aio_wait(); 188 } 189 } 190 191 static const AIOCBInfo iscsi_aiocb_info = { 192 .aiocb_size = sizeof(IscsiAIOCB), 193 .cancel = iscsi_aio_cancel, 194 }; 195 196 197 static void iscsi_process_read(void *arg); 198 static void iscsi_process_write(void *arg); 199 200 static void 201 iscsi_set_events(IscsiLun *iscsilun) 202 { 203 struct iscsi_context *iscsi = iscsilun->iscsi; 204 int ev; 205 206 /* We always register a read handler. */ 207 ev = POLLIN; 208 ev |= iscsi_which_events(iscsi); 209 if (ev != iscsilun->events) { 210 qemu_aio_set_fd_handler(iscsi_get_fd(iscsi), 211 iscsi_process_read, 212 (ev & POLLOUT) ? iscsi_process_write : NULL, 213 iscsilun); 214 215 } 216 217 iscsilun->events = ev; 218 } 219 220 static void 221 iscsi_process_read(void *arg) 222 { 223 IscsiLun *iscsilun = arg; 224 struct iscsi_context *iscsi = iscsilun->iscsi; 225 226 iscsi_service(iscsi, POLLIN); 227 iscsi_set_events(iscsilun); 228 } 229 230 static void 231 iscsi_process_write(void *arg) 232 { 233 IscsiLun *iscsilun = arg; 234 struct iscsi_context *iscsi = iscsilun->iscsi; 235 236 iscsi_service(iscsi, POLLOUT); 237 iscsi_set_events(iscsilun); 238 } 239 240 static int 241 iscsi_aio_writev_acb(IscsiAIOCB *acb); 242 243 static void 244 iscsi_aio_write16_cb(struct iscsi_context *iscsi, int status, 245 void *command_data, void *opaque) 246 { 247 IscsiAIOCB *acb = opaque; 248 249 trace_iscsi_aio_write16_cb(iscsi, status, acb, acb->canceled); 250 251 g_free(acb->buf); 252 acb->buf = NULL; 253 254 if (acb->canceled != 0) { 255 return; 256 } 257 258 acb->status = 0; 259 if (status != 0) { 260 if (status == SCSI_STATUS_CHECK_CONDITION 261 && acb->task->sense.key == SCSI_SENSE_UNIT_ATTENTION 262 && acb->retries-- > 0) { 263 scsi_free_scsi_task(acb->task); 264 acb->task = NULL; 265 if (iscsi_aio_writev_acb(acb) == 0) { 266 iscsi_set_events(acb->iscsilun); 267 return; 268 } 269 } 270 error_report("Failed to write16 data to iSCSI lun. %s", 271 iscsi_get_error(iscsi)); 272 acb->status = -EIO; 273 } 274 275 iscsi_schedule_bh(acb); 276 } 277 278 static int64_t sector_lun2qemu(int64_t sector, IscsiLun *iscsilun) 279 { 280 return sector * iscsilun->block_size / BDRV_SECTOR_SIZE; 281 } 282 283 static int64_t sector_qemu2lun(int64_t sector, IscsiLun *iscsilun) 284 { 285 return sector * BDRV_SECTOR_SIZE / iscsilun->block_size; 286 } 287 288 static bool is_request_lun_aligned(int64_t sector_num, int nb_sectors, 289 IscsiLun *iscsilun) 290 { 291 if ((sector_num * BDRV_SECTOR_SIZE) % iscsilun->block_size || 292 (nb_sectors * BDRV_SECTOR_SIZE) % iscsilun->block_size) { 293 error_report("iSCSI misaligned request: " 294 "iscsilun->block_size %u, sector_num %" PRIi64 295 ", nb_sectors %d", 296 iscsilun->block_size, sector_num, nb_sectors); 297 return 0; 298 } 299 return 1; 300 } 301 302 static int 303 iscsi_aio_writev_acb(IscsiAIOCB *acb) 304 { 305 struct iscsi_context *iscsi = acb->iscsilun->iscsi; 306 size_t size; 307 uint32_t num_sectors; 308 uint64_t lba; 309 #if !defined(LIBISCSI_FEATURE_IOVECTOR) 310 struct iscsi_data data; 311 #endif 312 int ret; 313 314 acb->canceled = 0; 315 acb->bh = NULL; 316 acb->status = -EINPROGRESS; 317 acb->buf = NULL; 318 319 /* this will allow us to get rid of 'buf' completely */ 320 size = acb->nb_sectors * BDRV_SECTOR_SIZE; 321 322 #if !defined(LIBISCSI_FEATURE_IOVECTOR) 323 data.size = MIN(size, acb->qiov->size); 324 325 /* if the iovec only contains one buffer we can pass it directly */ 326 if (acb->qiov->niov == 1) { 327 data.data = acb->qiov->iov[0].iov_base; 328 } else { 329 acb->buf = g_malloc(data.size); 330 qemu_iovec_to_buf(acb->qiov, 0, acb->buf, data.size); 331 data.data = acb->buf; 332 } 333 #endif 334 335 acb->task = malloc(sizeof(struct scsi_task)); 336 if (acb->task == NULL) { 337 error_report("iSCSI: Failed to allocate task for scsi WRITE16 " 338 "command. %s", iscsi_get_error(iscsi)); 339 return -1; 340 } 341 memset(acb->task, 0, sizeof(struct scsi_task)); 342 343 acb->task->xfer_dir = SCSI_XFER_WRITE; 344 acb->task->cdb_size = 16; 345 acb->task->cdb[0] = 0x8a; 346 lba = sector_qemu2lun(acb->sector_num, acb->iscsilun); 347 *(uint32_t *)&acb->task->cdb[2] = htonl(lba >> 32); 348 *(uint32_t *)&acb->task->cdb[6] = htonl(lba & 0xffffffff); 349 num_sectors = sector_qemu2lun(acb->nb_sectors, acb->iscsilun); 350 *(uint32_t *)&acb->task->cdb[10] = htonl(num_sectors); 351 acb->task->expxferlen = size; 352 353 #if defined(LIBISCSI_FEATURE_IOVECTOR) 354 ret = iscsi_scsi_command_async(iscsi, acb->iscsilun->lun, acb->task, 355 iscsi_aio_write16_cb, 356 NULL, 357 acb); 358 #else 359 ret = iscsi_scsi_command_async(iscsi, acb->iscsilun->lun, acb->task, 360 iscsi_aio_write16_cb, 361 &data, 362 acb); 363 #endif 364 if (ret != 0) { 365 scsi_free_scsi_task(acb->task); 366 g_free(acb->buf); 367 return -1; 368 } 369 370 #if defined(LIBISCSI_FEATURE_IOVECTOR) 371 scsi_task_set_iov_out(acb->task, (struct scsi_iovec*) acb->qiov->iov, acb->qiov->niov); 372 #endif 373 374 return 0; 375 } 376 377 static BlockDriverAIOCB * 378 iscsi_aio_writev(BlockDriverState *bs, int64_t sector_num, 379 QEMUIOVector *qiov, int nb_sectors, 380 BlockDriverCompletionFunc *cb, 381 void *opaque) 382 { 383 IscsiLun *iscsilun = bs->opaque; 384 IscsiAIOCB *acb; 385 386 if (!is_request_lun_aligned(sector_num, nb_sectors, iscsilun)) { 387 return NULL; 388 } 389 390 acb = qemu_aio_get(&iscsi_aiocb_info, bs, cb, opaque); 391 trace_iscsi_aio_writev(iscsilun->iscsi, sector_num, nb_sectors, opaque, acb); 392 393 acb->iscsilun = iscsilun; 394 acb->qiov = qiov; 395 acb->nb_sectors = nb_sectors; 396 acb->sector_num = sector_num; 397 acb->retries = ISCSI_CMD_RETRIES; 398 399 if (iscsi_aio_writev_acb(acb) != 0) { 400 qemu_aio_release(acb); 401 return NULL; 402 } 403 404 iscsi_set_events(iscsilun); 405 return &acb->common; 406 } 407 408 static int 409 iscsi_aio_readv_acb(IscsiAIOCB *acb); 410 411 static void 412 iscsi_aio_read16_cb(struct iscsi_context *iscsi, int status, 413 void *command_data, void *opaque) 414 { 415 IscsiAIOCB *acb = opaque; 416 417 trace_iscsi_aio_read16_cb(iscsi, status, acb, acb->canceled); 418 419 if (acb->canceled != 0) { 420 return; 421 } 422 423 acb->status = 0; 424 if (status != 0) { 425 if (status == SCSI_STATUS_CHECK_CONDITION 426 && acb->task->sense.key == SCSI_SENSE_UNIT_ATTENTION 427 && acb->retries-- > 0) { 428 scsi_free_scsi_task(acb->task); 429 acb->task = NULL; 430 if (iscsi_aio_readv_acb(acb) == 0) { 431 iscsi_set_events(acb->iscsilun); 432 return; 433 } 434 } 435 error_report("Failed to read16 data from iSCSI lun. %s", 436 iscsi_get_error(iscsi)); 437 acb->status = -EIO; 438 } 439 440 iscsi_schedule_bh(acb); 441 } 442 443 static int 444 iscsi_aio_readv_acb(IscsiAIOCB *acb) 445 { 446 struct iscsi_context *iscsi = acb->iscsilun->iscsi; 447 size_t size; 448 uint64_t lba; 449 uint32_t num_sectors; 450 int ret; 451 #if !defined(LIBISCSI_FEATURE_IOVECTOR) 452 int i; 453 #endif 454 455 acb->canceled = 0; 456 acb->bh = NULL; 457 acb->status = -EINPROGRESS; 458 acb->buf = NULL; 459 460 size = acb->nb_sectors * BDRV_SECTOR_SIZE; 461 462 acb->task = malloc(sizeof(struct scsi_task)); 463 if (acb->task == NULL) { 464 error_report("iSCSI: Failed to allocate task for scsi READ16 " 465 "command. %s", iscsi_get_error(iscsi)); 466 return -1; 467 } 468 memset(acb->task, 0, sizeof(struct scsi_task)); 469 470 acb->task->xfer_dir = SCSI_XFER_READ; 471 acb->task->expxferlen = size; 472 lba = sector_qemu2lun(acb->sector_num, acb->iscsilun); 473 num_sectors = sector_qemu2lun(acb->nb_sectors, acb->iscsilun); 474 475 switch (acb->iscsilun->type) { 476 case TYPE_DISK: 477 acb->task->cdb_size = 16; 478 acb->task->cdb[0] = 0x88; 479 *(uint32_t *)&acb->task->cdb[2] = htonl(lba >> 32); 480 *(uint32_t *)&acb->task->cdb[6] = htonl(lba & 0xffffffff); 481 *(uint32_t *)&acb->task->cdb[10] = htonl(num_sectors); 482 break; 483 default: 484 acb->task->cdb_size = 10; 485 acb->task->cdb[0] = 0x28; 486 *(uint32_t *)&acb->task->cdb[2] = htonl(lba); 487 *(uint16_t *)&acb->task->cdb[7] = htons(num_sectors); 488 break; 489 } 490 491 ret = iscsi_scsi_command_async(iscsi, acb->iscsilun->lun, acb->task, 492 iscsi_aio_read16_cb, 493 NULL, 494 acb); 495 if (ret != 0) { 496 scsi_free_scsi_task(acb->task); 497 return -1; 498 } 499 500 #if defined(LIBISCSI_FEATURE_IOVECTOR) 501 scsi_task_set_iov_in(acb->task, (struct scsi_iovec*) acb->qiov->iov, acb->qiov->niov); 502 #else 503 for (i = 0; i < acb->qiov->niov; i++) { 504 scsi_task_add_data_in_buffer(acb->task, 505 acb->qiov->iov[i].iov_len, 506 acb->qiov->iov[i].iov_base); 507 } 508 #endif 509 return 0; 510 } 511 512 static BlockDriverAIOCB * 513 iscsi_aio_readv(BlockDriverState *bs, int64_t sector_num, 514 QEMUIOVector *qiov, int nb_sectors, 515 BlockDriverCompletionFunc *cb, 516 void *opaque) 517 { 518 IscsiLun *iscsilun = bs->opaque; 519 IscsiAIOCB *acb; 520 521 if (!is_request_lun_aligned(sector_num, nb_sectors, iscsilun)) { 522 return NULL; 523 } 524 525 acb = qemu_aio_get(&iscsi_aiocb_info, bs, cb, opaque); 526 trace_iscsi_aio_readv(iscsilun->iscsi, sector_num, nb_sectors, opaque, acb); 527 528 acb->nb_sectors = nb_sectors; 529 acb->sector_num = sector_num; 530 acb->iscsilun = iscsilun; 531 acb->qiov = qiov; 532 acb->retries = ISCSI_CMD_RETRIES; 533 534 if (iscsi_aio_readv_acb(acb) != 0) { 535 qemu_aio_release(acb); 536 return NULL; 537 } 538 539 iscsi_set_events(iscsilun); 540 return &acb->common; 541 } 542 543 static int 544 iscsi_aio_flush_acb(IscsiAIOCB *acb); 545 546 static void 547 iscsi_synccache10_cb(struct iscsi_context *iscsi, int status, 548 void *command_data, void *opaque) 549 { 550 IscsiAIOCB *acb = opaque; 551 552 if (acb->canceled != 0) { 553 return; 554 } 555 556 acb->status = 0; 557 if (status != 0) { 558 if (status == SCSI_STATUS_CHECK_CONDITION 559 && acb->task->sense.key == SCSI_SENSE_UNIT_ATTENTION 560 && acb->retries-- > 0) { 561 scsi_free_scsi_task(acb->task); 562 acb->task = NULL; 563 if (iscsi_aio_flush_acb(acb) == 0) { 564 iscsi_set_events(acb->iscsilun); 565 return; 566 } 567 } 568 error_report("Failed to sync10 data on iSCSI lun. %s", 569 iscsi_get_error(iscsi)); 570 acb->status = -EIO; 571 } 572 573 iscsi_schedule_bh(acb); 574 } 575 576 static int 577 iscsi_aio_flush_acb(IscsiAIOCB *acb) 578 { 579 struct iscsi_context *iscsi = acb->iscsilun->iscsi; 580 581 acb->canceled = 0; 582 acb->bh = NULL; 583 acb->status = -EINPROGRESS; 584 acb->buf = NULL; 585 586 acb->task = iscsi_synchronizecache10_task(iscsi, acb->iscsilun->lun, 587 0, 0, 0, 0, 588 iscsi_synccache10_cb, 589 acb); 590 if (acb->task == NULL) { 591 error_report("iSCSI: Failed to send synchronizecache10 command. %s", 592 iscsi_get_error(iscsi)); 593 return -1; 594 } 595 596 return 0; 597 } 598 599 static BlockDriverAIOCB * 600 iscsi_aio_flush(BlockDriverState *bs, 601 BlockDriverCompletionFunc *cb, void *opaque) 602 { 603 IscsiLun *iscsilun = bs->opaque; 604 605 IscsiAIOCB *acb; 606 607 acb = qemu_aio_get(&iscsi_aiocb_info, bs, cb, opaque); 608 609 acb->iscsilun = iscsilun; 610 acb->retries = ISCSI_CMD_RETRIES; 611 612 if (iscsi_aio_flush_acb(acb) != 0) { 613 qemu_aio_release(acb); 614 return NULL; 615 } 616 617 iscsi_set_events(iscsilun); 618 619 return &acb->common; 620 } 621 622 #ifdef __linux__ 623 static void 624 iscsi_aio_ioctl_cb(struct iscsi_context *iscsi, int status, 625 void *command_data, void *opaque) 626 { 627 IscsiAIOCB *acb = opaque; 628 629 g_free(acb->buf); 630 acb->buf = NULL; 631 632 if (acb->canceled != 0) { 633 return; 634 } 635 636 acb->status = 0; 637 if (status < 0) { 638 error_report("Failed to ioctl(SG_IO) to iSCSI lun. %s", 639 iscsi_get_error(iscsi)); 640 acb->status = -EIO; 641 } 642 643 acb->ioh->driver_status = 0; 644 acb->ioh->host_status = 0; 645 acb->ioh->resid = 0; 646 647 #define SG_ERR_DRIVER_SENSE 0x08 648 649 if (status == SCSI_STATUS_CHECK_CONDITION && acb->task->datain.size >= 2) { 650 int ss; 651 652 acb->ioh->driver_status |= SG_ERR_DRIVER_SENSE; 653 654 acb->ioh->sb_len_wr = acb->task->datain.size - 2; 655 ss = (acb->ioh->mx_sb_len >= acb->ioh->sb_len_wr) ? 656 acb->ioh->mx_sb_len : acb->ioh->sb_len_wr; 657 memcpy(acb->ioh->sbp, &acb->task->datain.data[2], ss); 658 } 659 660 iscsi_schedule_bh(acb); 661 } 662 663 static BlockDriverAIOCB *iscsi_aio_ioctl(BlockDriverState *bs, 664 unsigned long int req, void *buf, 665 BlockDriverCompletionFunc *cb, void *opaque) 666 { 667 IscsiLun *iscsilun = bs->opaque; 668 struct iscsi_context *iscsi = iscsilun->iscsi; 669 struct iscsi_data data; 670 IscsiAIOCB *acb; 671 672 assert(req == SG_IO); 673 674 acb = qemu_aio_get(&iscsi_aiocb_info, bs, cb, opaque); 675 676 acb->iscsilun = iscsilun; 677 acb->canceled = 0; 678 acb->bh = NULL; 679 acb->status = -EINPROGRESS; 680 acb->buf = NULL; 681 acb->ioh = buf; 682 683 acb->task = malloc(sizeof(struct scsi_task)); 684 if (acb->task == NULL) { 685 error_report("iSCSI: Failed to allocate task for scsi command. %s", 686 iscsi_get_error(iscsi)); 687 qemu_aio_release(acb); 688 return NULL; 689 } 690 memset(acb->task, 0, sizeof(struct scsi_task)); 691 692 switch (acb->ioh->dxfer_direction) { 693 case SG_DXFER_TO_DEV: 694 acb->task->xfer_dir = SCSI_XFER_WRITE; 695 break; 696 case SG_DXFER_FROM_DEV: 697 acb->task->xfer_dir = SCSI_XFER_READ; 698 break; 699 default: 700 acb->task->xfer_dir = SCSI_XFER_NONE; 701 break; 702 } 703 704 acb->task->cdb_size = acb->ioh->cmd_len; 705 memcpy(&acb->task->cdb[0], acb->ioh->cmdp, acb->ioh->cmd_len); 706 acb->task->expxferlen = acb->ioh->dxfer_len; 707 708 data.size = 0; 709 if (acb->task->xfer_dir == SCSI_XFER_WRITE) { 710 if (acb->ioh->iovec_count == 0) { 711 data.data = acb->ioh->dxferp; 712 data.size = acb->ioh->dxfer_len; 713 } else { 714 #if defined(LIBISCSI_FEATURE_IOVECTOR) 715 scsi_task_set_iov_out(acb->task, 716 (struct scsi_iovec *) acb->ioh->dxferp, 717 acb->ioh->iovec_count); 718 #else 719 struct iovec *iov = (struct iovec *)acb->ioh->dxferp; 720 721 acb->buf = g_malloc(acb->ioh->dxfer_len); 722 data.data = acb->buf; 723 data.size = iov_to_buf(iov, acb->ioh->iovec_count, 0, 724 acb->buf, acb->ioh->dxfer_len); 725 #endif 726 } 727 } 728 729 if (iscsi_scsi_command_async(iscsi, iscsilun->lun, acb->task, 730 iscsi_aio_ioctl_cb, 731 (data.size > 0) ? &data : NULL, 732 acb) != 0) { 733 scsi_free_scsi_task(acb->task); 734 qemu_aio_release(acb); 735 return NULL; 736 } 737 738 /* tell libiscsi to read straight into the buffer we got from ioctl */ 739 if (acb->task->xfer_dir == SCSI_XFER_READ) { 740 if (acb->ioh->iovec_count == 0) { 741 scsi_task_add_data_in_buffer(acb->task, 742 acb->ioh->dxfer_len, 743 acb->ioh->dxferp); 744 } else { 745 #if defined(LIBISCSI_FEATURE_IOVECTOR) 746 scsi_task_set_iov_in(acb->task, 747 (struct scsi_iovec *) acb->ioh->dxferp, 748 acb->ioh->iovec_count); 749 #else 750 int i; 751 for (i = 0; i < acb->ioh->iovec_count; i++) { 752 struct iovec *iov = (struct iovec *)acb->ioh->dxferp; 753 754 scsi_task_add_data_in_buffer(acb->task, 755 iov[i].iov_len, 756 iov[i].iov_base); 757 } 758 #endif 759 } 760 } 761 762 iscsi_set_events(iscsilun); 763 764 return &acb->common; 765 } 766 767 768 static void ioctl_cb(void *opaque, int status) 769 { 770 int *p_status = opaque; 771 *p_status = status; 772 } 773 774 static int iscsi_ioctl(BlockDriverState *bs, unsigned long int req, void *buf) 775 { 776 IscsiLun *iscsilun = bs->opaque; 777 int status; 778 779 switch (req) { 780 case SG_GET_VERSION_NUM: 781 *(int *)buf = 30000; 782 break; 783 case SG_GET_SCSI_ID: 784 ((struct sg_scsi_id *)buf)->scsi_type = iscsilun->type; 785 break; 786 case SG_IO: 787 status = -EINPROGRESS; 788 iscsi_aio_ioctl(bs, req, buf, ioctl_cb, &status); 789 790 while (status == -EINPROGRESS) { 791 qemu_aio_wait(); 792 } 793 794 return 0; 795 default: 796 return -1; 797 } 798 return 0; 799 } 800 #endif 801 802 static int64_t 803 iscsi_getlength(BlockDriverState *bs) 804 { 805 IscsiLun *iscsilun = bs->opaque; 806 int64_t len; 807 808 len = iscsilun->num_blocks; 809 len *= iscsilun->block_size; 810 811 return len; 812 } 813 814 static int64_t coroutine_fn iscsi_co_get_block_status(BlockDriverState *bs, 815 int64_t sector_num, 816 int nb_sectors, int *pnum) 817 { 818 IscsiLun *iscsilun = bs->opaque; 819 struct scsi_get_lba_status *lbas = NULL; 820 struct scsi_lba_status_descriptor *lbasd = NULL; 821 struct IscsiTask iTask; 822 int64_t ret; 823 824 iscsi_co_init_iscsitask(iscsilun, &iTask); 825 826 if (!is_request_lun_aligned(sector_num, nb_sectors, iscsilun)) { 827 ret = -EINVAL; 828 goto out; 829 } 830 831 /* default to all sectors allocated */ 832 ret = BDRV_BLOCK_DATA; 833 ret |= (sector_num << BDRV_SECTOR_BITS) | BDRV_BLOCK_OFFSET_VALID; 834 *pnum = nb_sectors; 835 836 /* LUN does not support logical block provisioning */ 837 if (iscsilun->lbpme == 0) { 838 goto out; 839 } 840 841 retry: 842 if (iscsi_get_lba_status_task(iscsilun->iscsi, iscsilun->lun, 843 sector_qemu2lun(sector_num, iscsilun), 844 8 + 16, iscsi_co_generic_cb, 845 &iTask) == NULL) { 846 ret = -EIO; 847 goto out; 848 } 849 850 while (!iTask.complete) { 851 iscsi_set_events(iscsilun); 852 qemu_coroutine_yield(); 853 } 854 855 if (iTask.do_retry) { 856 if (iTask.task != NULL) { 857 scsi_free_scsi_task(iTask.task); 858 iTask.task = NULL; 859 } 860 goto retry; 861 } 862 863 if (iTask.status != SCSI_STATUS_GOOD) { 864 /* in case the get_lba_status_callout fails (i.e. 865 * because the device is busy or the cmd is not 866 * supported) we pretend all blocks are allocated 867 * for backwards compatiblity */ 868 goto out; 869 } 870 871 lbas = scsi_datain_unmarshall(iTask.task); 872 if (lbas == NULL) { 873 ret = -EIO; 874 goto out; 875 } 876 877 lbasd = &lbas->descriptors[0]; 878 879 if (sector_qemu2lun(sector_num, iscsilun) != lbasd->lba) { 880 ret = -EIO; 881 goto out; 882 } 883 884 *pnum = sector_lun2qemu(lbasd->num_blocks, iscsilun); 885 if (*pnum > nb_sectors) { 886 *pnum = nb_sectors; 887 } 888 889 if (lbasd->provisioning == SCSI_PROVISIONING_TYPE_DEALLOCATED || 890 lbasd->provisioning == SCSI_PROVISIONING_TYPE_ANCHORED) { 891 ret &= ~BDRV_BLOCK_DATA; 892 if (iscsilun->lbprz) { 893 ret |= BDRV_BLOCK_ZERO; 894 } 895 } 896 897 out: 898 if (iTask.task != NULL) { 899 scsi_free_scsi_task(iTask.task); 900 } 901 return ret; 902 } 903 904 static int 905 coroutine_fn iscsi_co_discard(BlockDriverState *bs, int64_t sector_num, 906 int nb_sectors) 907 { 908 IscsiLun *iscsilun = bs->opaque; 909 struct IscsiTask iTask; 910 struct unmap_list list; 911 uint32_t nb_blocks; 912 uint32_t max_unmap; 913 914 if (!is_request_lun_aligned(sector_num, nb_sectors, iscsilun)) { 915 return -EINVAL; 916 } 917 918 if (!iscsilun->lbp.lbpu) { 919 /* UNMAP is not supported by the target */ 920 return 0; 921 } 922 923 list.lba = sector_qemu2lun(sector_num, iscsilun); 924 nb_blocks = sector_qemu2lun(nb_sectors, iscsilun); 925 926 max_unmap = iscsilun->bl.max_unmap; 927 if (max_unmap == 0xffffffff) { 928 max_unmap = ISCSI_MAX_UNMAP; 929 } 930 931 while (nb_blocks > 0) { 932 iscsi_co_init_iscsitask(iscsilun, &iTask); 933 list.num = nb_blocks; 934 if (list.num > max_unmap) { 935 list.num = max_unmap; 936 } 937 retry: 938 if (iscsi_unmap_task(iscsilun->iscsi, iscsilun->lun, 0, 0, &list, 1, 939 iscsi_co_generic_cb, &iTask) == NULL) { 940 return -EIO; 941 } 942 943 while (!iTask.complete) { 944 iscsi_set_events(iscsilun); 945 qemu_coroutine_yield(); 946 } 947 948 if (iTask.task != NULL) { 949 scsi_free_scsi_task(iTask.task); 950 iTask.task = NULL; 951 } 952 953 if (iTask.do_retry) { 954 goto retry; 955 } 956 957 if (iTask.status == SCSI_STATUS_CHECK_CONDITION) { 958 /* the target might fail with a check condition if it 959 is not happy with the alignment of the UNMAP request 960 we silently fail in this case */ 961 return 0; 962 } 963 964 if (iTask.status != SCSI_STATUS_GOOD) { 965 return -EIO; 966 } 967 968 list.lba += list.num; 969 nb_blocks -= list.num; 970 } 971 972 return 0; 973 } 974 975 static int parse_chap(struct iscsi_context *iscsi, const char *target) 976 { 977 QemuOptsList *list; 978 QemuOpts *opts; 979 const char *user = NULL; 980 const char *password = NULL; 981 982 list = qemu_find_opts("iscsi"); 983 if (!list) { 984 return 0; 985 } 986 987 opts = qemu_opts_find(list, target); 988 if (opts == NULL) { 989 opts = QTAILQ_FIRST(&list->head); 990 if (!opts) { 991 return 0; 992 } 993 } 994 995 user = qemu_opt_get(opts, "user"); 996 if (!user) { 997 return 0; 998 } 999 1000 password = qemu_opt_get(opts, "password"); 1001 if (!password) { 1002 error_report("CHAP username specified but no password was given"); 1003 return -1; 1004 } 1005 1006 if (iscsi_set_initiator_username_pwd(iscsi, user, password)) { 1007 error_report("Failed to set initiator username and password"); 1008 return -1; 1009 } 1010 1011 return 0; 1012 } 1013 1014 static void parse_header_digest(struct iscsi_context *iscsi, const char *target) 1015 { 1016 QemuOptsList *list; 1017 QemuOpts *opts; 1018 const char *digest = NULL; 1019 1020 list = qemu_find_opts("iscsi"); 1021 if (!list) { 1022 return; 1023 } 1024 1025 opts = qemu_opts_find(list, target); 1026 if (opts == NULL) { 1027 opts = QTAILQ_FIRST(&list->head); 1028 if (!opts) { 1029 return; 1030 } 1031 } 1032 1033 digest = qemu_opt_get(opts, "header-digest"); 1034 if (!digest) { 1035 return; 1036 } 1037 1038 if (!strcmp(digest, "CRC32C")) { 1039 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_CRC32C); 1040 } else if (!strcmp(digest, "NONE")) { 1041 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE); 1042 } else if (!strcmp(digest, "CRC32C-NONE")) { 1043 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_CRC32C_NONE); 1044 } else if (!strcmp(digest, "NONE-CRC32C")) { 1045 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE_CRC32C); 1046 } else { 1047 error_report("Invalid header-digest setting : %s", digest); 1048 } 1049 } 1050 1051 static char *parse_initiator_name(const char *target) 1052 { 1053 QemuOptsList *list; 1054 QemuOpts *opts; 1055 const char *name; 1056 char *iscsi_name; 1057 UuidInfo *uuid_info; 1058 1059 list = qemu_find_opts("iscsi"); 1060 if (list) { 1061 opts = qemu_opts_find(list, target); 1062 if (!opts) { 1063 opts = QTAILQ_FIRST(&list->head); 1064 } 1065 if (opts) { 1066 name = qemu_opt_get(opts, "initiator-name"); 1067 if (name) { 1068 return g_strdup(name); 1069 } 1070 } 1071 } 1072 1073 uuid_info = qmp_query_uuid(NULL); 1074 if (strcmp(uuid_info->UUID, UUID_NONE) == 0) { 1075 name = qemu_get_vm_name(); 1076 } else { 1077 name = uuid_info->UUID; 1078 } 1079 iscsi_name = g_strdup_printf("iqn.2008-11.org.linux-kvm%s%s", 1080 name ? ":" : "", name ? name : ""); 1081 qapi_free_UuidInfo(uuid_info); 1082 return iscsi_name; 1083 } 1084 1085 #if defined(LIBISCSI_FEATURE_NOP_COUNTER) 1086 static void iscsi_nop_timed_event(void *opaque) 1087 { 1088 IscsiLun *iscsilun = opaque; 1089 1090 if (iscsi_get_nops_in_flight(iscsilun->iscsi) > MAX_NOP_FAILURES) { 1091 error_report("iSCSI: NOP timeout. Reconnecting..."); 1092 iscsi_reconnect(iscsilun->iscsi); 1093 } 1094 1095 if (iscsi_nop_out_async(iscsilun->iscsi, NULL, NULL, 0, NULL) != 0) { 1096 error_report("iSCSI: failed to sent NOP-Out. Disabling NOP messages."); 1097 return; 1098 } 1099 1100 timer_mod(iscsilun->nop_timer, qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + NOP_INTERVAL); 1101 iscsi_set_events(iscsilun); 1102 } 1103 #endif 1104 1105 static int iscsi_readcapacity_sync(IscsiLun *iscsilun) 1106 { 1107 struct scsi_task *task = NULL; 1108 struct scsi_readcapacity10 *rc10 = NULL; 1109 struct scsi_readcapacity16 *rc16 = NULL; 1110 int ret = 0; 1111 int retries = ISCSI_CMD_RETRIES; 1112 1113 do { 1114 if (task != NULL) { 1115 scsi_free_scsi_task(task); 1116 task = NULL; 1117 } 1118 1119 switch (iscsilun->type) { 1120 case TYPE_DISK: 1121 task = iscsi_readcapacity16_sync(iscsilun->iscsi, iscsilun->lun); 1122 if (task != NULL && task->status == SCSI_STATUS_GOOD) { 1123 rc16 = scsi_datain_unmarshall(task); 1124 if (rc16 == NULL) { 1125 error_report("iSCSI: Failed to unmarshall readcapacity16 data."); 1126 ret = -EINVAL; 1127 } else { 1128 iscsilun->block_size = rc16->block_length; 1129 iscsilun->num_blocks = rc16->returned_lba + 1; 1130 iscsilun->lbpme = rc16->lbpme; 1131 iscsilun->lbprz = rc16->lbprz; 1132 } 1133 } 1134 break; 1135 case TYPE_ROM: 1136 task = iscsi_readcapacity10_sync(iscsilun->iscsi, iscsilun->lun, 0, 0); 1137 if (task != NULL && task->status == SCSI_STATUS_GOOD) { 1138 rc10 = scsi_datain_unmarshall(task); 1139 if (rc10 == NULL) { 1140 error_report("iSCSI: Failed to unmarshall readcapacity10 data."); 1141 ret = -EINVAL; 1142 } else { 1143 iscsilun->block_size = rc10->block_size; 1144 if (rc10->lba == 0) { 1145 /* blank disk loaded */ 1146 iscsilun->num_blocks = 0; 1147 } else { 1148 iscsilun->num_blocks = rc10->lba + 1; 1149 } 1150 } 1151 } 1152 break; 1153 default: 1154 return 0; 1155 } 1156 } while (task != NULL && task->status == SCSI_STATUS_CHECK_CONDITION 1157 && task->sense.key == SCSI_SENSE_UNIT_ATTENTION 1158 && retries-- > 0); 1159 1160 if (task == NULL || task->status != SCSI_STATUS_GOOD) { 1161 error_report("iSCSI: failed to send readcapacity10 command."); 1162 ret = -EINVAL; 1163 } 1164 if (task) { 1165 scsi_free_scsi_task(task); 1166 } 1167 return ret; 1168 } 1169 1170 /* TODO Convert to fine grained options */ 1171 static QemuOptsList runtime_opts = { 1172 .name = "iscsi", 1173 .head = QTAILQ_HEAD_INITIALIZER(runtime_opts.head), 1174 .desc = { 1175 { 1176 .name = "filename", 1177 .type = QEMU_OPT_STRING, 1178 .help = "URL to the iscsi image", 1179 }, 1180 { /* end of list */ } 1181 }, 1182 }; 1183 1184 static struct scsi_task *iscsi_do_inquiry(struct iscsi_context *iscsi, 1185 int lun, int evpd, int pc) { 1186 int full_size; 1187 struct scsi_task *task = NULL; 1188 task = iscsi_inquiry_sync(iscsi, lun, evpd, pc, 64); 1189 if (task == NULL || task->status != SCSI_STATUS_GOOD) { 1190 goto fail; 1191 } 1192 full_size = scsi_datain_getfullsize(task); 1193 if (full_size > task->datain.size) { 1194 scsi_free_scsi_task(task); 1195 1196 /* we need more data for the full list */ 1197 task = iscsi_inquiry_sync(iscsi, lun, evpd, pc, full_size); 1198 if (task == NULL || task->status != SCSI_STATUS_GOOD) { 1199 goto fail; 1200 } 1201 } 1202 1203 return task; 1204 1205 fail: 1206 error_report("iSCSI: Inquiry command failed : %s", 1207 iscsi_get_error(iscsi)); 1208 if (task) { 1209 scsi_free_scsi_task(task); 1210 return NULL; 1211 } 1212 return NULL; 1213 } 1214 1215 /* 1216 * We support iscsi url's on the form 1217 * iscsi://[<username>%<password>@]<host>[:<port>]/<targetname>/<lun> 1218 */ 1219 static int iscsi_open(BlockDriverState *bs, QDict *options, int flags, 1220 Error **errp) 1221 { 1222 IscsiLun *iscsilun = bs->opaque; 1223 struct iscsi_context *iscsi = NULL; 1224 struct iscsi_url *iscsi_url = NULL; 1225 struct scsi_task *task = NULL; 1226 struct scsi_inquiry_standard *inq = NULL; 1227 char *initiator_name = NULL; 1228 QemuOpts *opts; 1229 Error *local_err = NULL; 1230 const char *filename; 1231 int ret; 1232 1233 if ((BDRV_SECTOR_SIZE % 512) != 0) { 1234 error_report("iSCSI: Invalid BDRV_SECTOR_SIZE. " 1235 "BDRV_SECTOR_SIZE(%lld) is not a multiple " 1236 "of 512", BDRV_SECTOR_SIZE); 1237 return -EINVAL; 1238 } 1239 1240 opts = qemu_opts_create_nofail(&runtime_opts); 1241 qemu_opts_absorb_qdict(opts, options, &local_err); 1242 if (error_is_set(&local_err)) { 1243 qerror_report_err(local_err); 1244 error_free(local_err); 1245 ret = -EINVAL; 1246 goto out; 1247 } 1248 1249 filename = qemu_opt_get(opts, "filename"); 1250 1251 1252 iscsi_url = iscsi_parse_full_url(iscsi, filename); 1253 if (iscsi_url == NULL) { 1254 error_report("Failed to parse URL : %s", filename); 1255 ret = -EINVAL; 1256 goto out; 1257 } 1258 1259 memset(iscsilun, 0, sizeof(IscsiLun)); 1260 1261 initiator_name = parse_initiator_name(iscsi_url->target); 1262 1263 iscsi = iscsi_create_context(initiator_name); 1264 if (iscsi == NULL) { 1265 error_report("iSCSI: Failed to create iSCSI context."); 1266 ret = -ENOMEM; 1267 goto out; 1268 } 1269 1270 if (iscsi_set_targetname(iscsi, iscsi_url->target)) { 1271 error_report("iSCSI: Failed to set target name."); 1272 ret = -EINVAL; 1273 goto out; 1274 } 1275 1276 if (iscsi_url->user != NULL) { 1277 ret = iscsi_set_initiator_username_pwd(iscsi, iscsi_url->user, 1278 iscsi_url->passwd); 1279 if (ret != 0) { 1280 error_report("Failed to set initiator username and password"); 1281 ret = -EINVAL; 1282 goto out; 1283 } 1284 } 1285 1286 /* check if we got CHAP username/password via the options */ 1287 if (parse_chap(iscsi, iscsi_url->target) != 0) { 1288 error_report("iSCSI: Failed to set CHAP user/password"); 1289 ret = -EINVAL; 1290 goto out; 1291 } 1292 1293 if (iscsi_set_session_type(iscsi, ISCSI_SESSION_NORMAL) != 0) { 1294 error_report("iSCSI: Failed to set session type to normal."); 1295 ret = -EINVAL; 1296 goto out; 1297 } 1298 1299 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE_CRC32C); 1300 1301 /* check if we got HEADER_DIGEST via the options */ 1302 parse_header_digest(iscsi, iscsi_url->target); 1303 1304 if (iscsi_full_connect_sync(iscsi, iscsi_url->portal, iscsi_url->lun) != 0) { 1305 error_report("iSCSI: Failed to connect to LUN : %s", 1306 iscsi_get_error(iscsi)); 1307 ret = -EINVAL; 1308 goto out; 1309 } 1310 1311 iscsilun->iscsi = iscsi; 1312 iscsilun->lun = iscsi_url->lun; 1313 1314 task = iscsi_inquiry_sync(iscsi, iscsilun->lun, 0, 0, 36); 1315 1316 if (task == NULL || task->status != SCSI_STATUS_GOOD) { 1317 error_report("iSCSI: failed to send inquiry command."); 1318 ret = -EINVAL; 1319 goto out; 1320 } 1321 1322 inq = scsi_datain_unmarshall(task); 1323 if (inq == NULL) { 1324 error_report("iSCSI: Failed to unmarshall inquiry data."); 1325 ret = -EINVAL; 1326 goto out; 1327 } 1328 1329 iscsilun->type = inq->periperal_device_type; 1330 1331 if ((ret = iscsi_readcapacity_sync(iscsilun)) != 0) { 1332 goto out; 1333 } 1334 bs->total_sectors = sector_lun2qemu(iscsilun->num_blocks, iscsilun); 1335 1336 /* Medium changer or tape. We dont have any emulation for this so this must 1337 * be sg ioctl compatible. We force it to be sg, otherwise qemu will try 1338 * to read from the device to guess the image format. 1339 */ 1340 if (iscsilun->type == TYPE_MEDIUM_CHANGER || 1341 iscsilun->type == TYPE_TAPE) { 1342 bs->sg = 1; 1343 } 1344 1345 if (iscsilun->lbpme) { 1346 struct scsi_inquiry_logical_block_provisioning *inq_lbp; 1347 task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1, 1348 SCSI_INQUIRY_PAGECODE_LOGICAL_BLOCK_PROVISIONING); 1349 if (task == NULL) { 1350 ret = -EINVAL; 1351 goto out; 1352 } 1353 inq_lbp = scsi_datain_unmarshall(task); 1354 if (inq_lbp == NULL) { 1355 error_report("iSCSI: failed to unmarshall inquiry datain blob"); 1356 ret = -EINVAL; 1357 goto out; 1358 } 1359 memcpy(&iscsilun->lbp, inq_lbp, 1360 sizeof(struct scsi_inquiry_logical_block_provisioning)); 1361 scsi_free_scsi_task(task); 1362 task = NULL; 1363 } 1364 1365 if (iscsilun->lbp.lbpu || iscsilun->lbp.lbpws) { 1366 struct scsi_inquiry_block_limits *inq_bl; 1367 task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1, 1368 SCSI_INQUIRY_PAGECODE_BLOCK_LIMITS); 1369 if (task == NULL) { 1370 ret = -EINVAL; 1371 goto out; 1372 } 1373 inq_bl = scsi_datain_unmarshall(task); 1374 if (inq_bl == NULL) { 1375 error_report("iSCSI: failed to unmarshall inquiry datain blob"); 1376 ret = -EINVAL; 1377 goto out; 1378 } 1379 memcpy(&iscsilun->bl, inq_bl, 1380 sizeof(struct scsi_inquiry_block_limits)); 1381 scsi_free_scsi_task(task); 1382 task = NULL; 1383 } 1384 1385 #if defined(LIBISCSI_FEATURE_NOP_COUNTER) 1386 /* Set up a timer for sending out iSCSI NOPs */ 1387 iscsilun->nop_timer = timer_new_ms(QEMU_CLOCK_REALTIME, iscsi_nop_timed_event, iscsilun); 1388 timer_mod(iscsilun->nop_timer, qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + NOP_INTERVAL); 1389 #endif 1390 1391 out: 1392 qemu_opts_del(opts); 1393 if (initiator_name != NULL) { 1394 g_free(initiator_name); 1395 } 1396 if (iscsi_url != NULL) { 1397 iscsi_destroy_url(iscsi_url); 1398 } 1399 if (task != NULL) { 1400 scsi_free_scsi_task(task); 1401 } 1402 1403 if (ret) { 1404 if (iscsi != NULL) { 1405 iscsi_destroy_context(iscsi); 1406 } 1407 memset(iscsilun, 0, sizeof(IscsiLun)); 1408 } 1409 return ret; 1410 } 1411 1412 static void iscsi_close(BlockDriverState *bs) 1413 { 1414 IscsiLun *iscsilun = bs->opaque; 1415 struct iscsi_context *iscsi = iscsilun->iscsi; 1416 1417 if (iscsilun->nop_timer) { 1418 timer_del(iscsilun->nop_timer); 1419 timer_free(iscsilun->nop_timer); 1420 } 1421 qemu_aio_set_fd_handler(iscsi_get_fd(iscsi), NULL, NULL, NULL); 1422 iscsi_destroy_context(iscsi); 1423 memset(iscsilun, 0, sizeof(IscsiLun)); 1424 } 1425 1426 static int iscsi_truncate(BlockDriverState *bs, int64_t offset) 1427 { 1428 IscsiLun *iscsilun = bs->opaque; 1429 int ret = 0; 1430 1431 if (iscsilun->type != TYPE_DISK) { 1432 return -ENOTSUP; 1433 } 1434 1435 if ((ret = iscsi_readcapacity_sync(iscsilun)) != 0) { 1436 return ret; 1437 } 1438 1439 if (offset > iscsi_getlength(bs)) { 1440 return -EINVAL; 1441 } 1442 1443 return 0; 1444 } 1445 1446 static int iscsi_has_zero_init(BlockDriverState *bs) 1447 { 1448 return 0; 1449 } 1450 1451 static int iscsi_create(const char *filename, QEMUOptionParameter *options, 1452 Error **errp) 1453 { 1454 int ret = 0; 1455 int64_t total_size = 0; 1456 BlockDriverState *bs; 1457 IscsiLun *iscsilun = NULL; 1458 QDict *bs_options; 1459 1460 bs = bdrv_new(""); 1461 1462 /* Read out options */ 1463 while (options && options->name) { 1464 if (!strcmp(options->name, "size")) { 1465 total_size = options->value.n / BDRV_SECTOR_SIZE; 1466 } 1467 options++; 1468 } 1469 1470 bs->opaque = g_malloc0(sizeof(struct IscsiLun)); 1471 iscsilun = bs->opaque; 1472 1473 bs_options = qdict_new(); 1474 qdict_put(bs_options, "filename", qstring_from_str(filename)); 1475 ret = iscsi_open(bs, bs_options, 0, NULL); 1476 QDECREF(bs_options); 1477 1478 if (ret != 0) { 1479 goto out; 1480 } 1481 if (iscsilun->nop_timer) { 1482 timer_del(iscsilun->nop_timer); 1483 timer_free(iscsilun->nop_timer); 1484 } 1485 if (iscsilun->type != TYPE_DISK) { 1486 ret = -ENODEV; 1487 goto out; 1488 } 1489 if (bs->total_sectors < total_size) { 1490 ret = -ENOSPC; 1491 goto out; 1492 } 1493 1494 ret = 0; 1495 out: 1496 if (iscsilun->iscsi != NULL) { 1497 iscsi_destroy_context(iscsilun->iscsi); 1498 } 1499 g_free(bs->opaque); 1500 bs->opaque = NULL; 1501 bdrv_unref(bs); 1502 return ret; 1503 } 1504 1505 static QEMUOptionParameter iscsi_create_options[] = { 1506 { 1507 .name = BLOCK_OPT_SIZE, 1508 .type = OPT_SIZE, 1509 .help = "Virtual disk size" 1510 }, 1511 { NULL } 1512 }; 1513 1514 static BlockDriver bdrv_iscsi = { 1515 .format_name = "iscsi", 1516 .protocol_name = "iscsi", 1517 1518 .instance_size = sizeof(IscsiLun), 1519 .bdrv_file_open = iscsi_open, 1520 .bdrv_close = iscsi_close, 1521 .bdrv_create = iscsi_create, 1522 .create_options = iscsi_create_options, 1523 1524 .bdrv_getlength = iscsi_getlength, 1525 .bdrv_truncate = iscsi_truncate, 1526 1527 .bdrv_co_get_block_status = iscsi_co_get_block_status, 1528 .bdrv_co_discard = iscsi_co_discard, 1529 1530 .bdrv_aio_readv = iscsi_aio_readv, 1531 .bdrv_aio_writev = iscsi_aio_writev, 1532 .bdrv_aio_flush = iscsi_aio_flush, 1533 1534 .bdrv_has_zero_init = iscsi_has_zero_init, 1535 1536 #ifdef __linux__ 1537 .bdrv_ioctl = iscsi_ioctl, 1538 .bdrv_aio_ioctl = iscsi_aio_ioctl, 1539 #endif 1540 }; 1541 1542 static QemuOptsList qemu_iscsi_opts = { 1543 .name = "iscsi", 1544 .head = QTAILQ_HEAD_INITIALIZER(qemu_iscsi_opts.head), 1545 .desc = { 1546 { 1547 .name = "user", 1548 .type = QEMU_OPT_STRING, 1549 .help = "username for CHAP authentication to target", 1550 },{ 1551 .name = "password", 1552 .type = QEMU_OPT_STRING, 1553 .help = "password for CHAP authentication to target", 1554 },{ 1555 .name = "header-digest", 1556 .type = QEMU_OPT_STRING, 1557 .help = "HeaderDigest setting. " 1558 "{CRC32C|CRC32C-NONE|NONE-CRC32C|NONE}", 1559 },{ 1560 .name = "initiator-name", 1561 .type = QEMU_OPT_STRING, 1562 .help = "Initiator iqn name to use when connecting", 1563 }, 1564 { /* end of list */ } 1565 }, 1566 }; 1567 1568 static void iscsi_block_init(void) 1569 { 1570 bdrv_register(&bdrv_iscsi); 1571 qemu_add_opts(&qemu_iscsi_opts); 1572 } 1573 1574 block_init(iscsi_block_init); 1575