block/iscsi.c

   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 "hw/scsi-defs.h"
  35
  36 #include <iscsi/iscsi.h>
  37 #include <iscsi/scsi-lowlevel.h>
  38
  39 #ifdef __linux__
  40 #include <scsi/sg.h>
  41 #include <hw/scsi-defs.h>
  42 #endif
  43
  44 typedef struct IscsiLun {
  45     struct iscsi_context *iscsi;
  46     int lun;
  47     enum scsi_inquiry_peripheral_device_type type;
  48     int block_size;
  49     uint64_t num_blocks;
  50     int events;
  51 } IscsiLun;
  52
  53 typedef struct IscsiAIOCB {
  54     BlockDriverAIOCB common;
  55     QEMUIOVector *qiov;
  56     QEMUBH *bh;
  57     IscsiLun *iscsilun;
  58     struct scsi_task *task;
  59     uint8_t *buf;
  60     int status;
  61     int canceled;
  62     size_t read_size;
  63     size_t read_offset;
  64 #ifdef __linux__
  65     sg_io_hdr_t *ioh;
  66 #endif
  67 } IscsiAIOCB;
  68
  69 static void
  70 iscsi_bh_cb(void *p)
  71 {
  72     IscsiAIOCB *acb = p;
  73
  74     qemu_bh_delete(acb->bh);
  75
  76     if (acb->canceled == 0) {
  77         acb->common.cb(acb->common.opaque, acb->status);
  78     }
  79
  80     if (acb->task != NULL) {
  81         scsi_free_scsi_task(acb->task);
  82         acb->task = NULL;
  83     }
  84
  85     qemu_aio_release(acb);
  86 }
  87
  88 static void
  89 iscsi_schedule_bh(IscsiAIOCB *acb)
  90 {
  91     if (acb->bh) {
  92         return;
  93     }
  94     acb->bh = qemu_bh_new(iscsi_bh_cb, acb);
  95     qemu_bh_schedule(acb->bh);
  96 }
  97
  98
  99 static void
 100 iscsi_abort_task_cb(struct iscsi_context *iscsi, int status, void *command_data,
 101                     void *private_data)
 102 {
 103     IscsiAIOCB *acb = private_data;
 104
 105     acb->status = -ECANCELED;
 106     iscsi_schedule_bh(acb);
 107 }
 108
 109 static void
 110 iscsi_aio_cancel(BlockDriverAIOCB *blockacb)
 111 {
 112     IscsiAIOCB *acb = (IscsiAIOCB *)blockacb;
 113     IscsiLun *iscsilun = acb->iscsilun;
 114
 115     if (acb->status != -EINPROGRESS) {
 116         return;
 117     }
 118
 119     acb->canceled = 1;
 120
 121     /* send a task mgmt call to the target to cancel the task on the target */
 122     iscsi_task_mgmt_abort_task_async(iscsilun->iscsi, acb->task,
 123                                      iscsi_abort_task_cb, acb);
 124
 125     while (acb->status == -EINPROGRESS) {
 126         qemu_aio_wait();
 127     }
 128 }
 129
 130 static const AIOCBInfo iscsi_aiocb_info = {
 131     .aiocb_size         = sizeof(IscsiAIOCB),
 132     .cancel             = iscsi_aio_cancel,
 133 };
 134
 135
 136 static void iscsi_process_read(void *arg);
 137 static void iscsi_process_write(void *arg);
 138
 139 static int iscsi_process_flush(void *arg)
 140 {
 141     IscsiLun *iscsilun = arg;
 142
 143     return iscsi_queue_length(iscsilun->iscsi) > 0;
 144 }
 145
 146 static void
 147 iscsi_set_events(IscsiLun *iscsilun)
 148 {
 149     struct iscsi_context *iscsi = iscsilun->iscsi;
 150     int ev;
 151
 152     /* We always register a read handler.  */
 153     ev = POLLIN;
 154     ev |= iscsi_which_events(iscsi);
 155     if (ev != iscsilun->events) {
 156         qemu_aio_set_fd_handler(iscsi_get_fd(iscsi),
 157                       iscsi_process_read,
 158                       (ev & POLLOUT) ? iscsi_process_write : NULL,
 159                       iscsi_process_flush,
 160                       iscsilun);
 161
 162     }
 163
 164     iscsilun->events = ev;
 165 }
 166
 167 static void
 168 iscsi_process_read(void *arg)
 169 {
 170     IscsiLun *iscsilun = arg;
 171     struct iscsi_context *iscsi = iscsilun->iscsi;
 172
 173     iscsi_service(iscsi, POLLIN);
 174     iscsi_set_events(iscsilun);
 175 }
 176
 177 static void
 178 iscsi_process_write(void *arg)
 179 {
 180     IscsiLun *iscsilun = arg;
 181     struct iscsi_context *iscsi = iscsilun->iscsi;
 182
 183     iscsi_service(iscsi, POLLOUT);
 184     iscsi_set_events(iscsilun);
 185 }
 186
 187
 188 static void
 189 iscsi_aio_write16_cb(struct iscsi_context *iscsi, int status,
 190                      void *command_data, void *opaque)
 191 {
 192     IscsiAIOCB *acb = opaque;
 193
 194     trace_iscsi_aio_write16_cb(iscsi, status, acb, acb->canceled);
 195
 196     g_free(acb->buf);
 197
 198     if (acb->canceled != 0) {
 199         return;
 200     }
 201
 202     acb->status = 0;
 203     if (status < 0) {
 204         error_report("Failed to write16 data to iSCSI lun. %s",
 205                      iscsi_get_error(iscsi));
 206         acb->status = -EIO;
 207     }
 208
 209     iscsi_schedule_bh(acb);
 210 }
 211
 212 static int64_t sector_qemu2lun(int64_t sector, IscsiLun *iscsilun)
 213 {
 214     return sector * BDRV_SECTOR_SIZE / iscsilun->block_size;
 215 }
 216
 217 static BlockDriverAIOCB *
 218 iscsi_aio_writev(BlockDriverState *bs, int64_t sector_num,
 219                  QEMUIOVector *qiov, int nb_sectors,
 220                  BlockDriverCompletionFunc *cb,
 221                  void *opaque)
 222 {
 223     IscsiLun *iscsilun = bs->opaque;
 224     struct iscsi_context *iscsi = iscsilun->iscsi;
 225     IscsiAIOCB *acb;
 226     size_t size;
 227     uint32_t num_sectors;
 228     uint64_t lba;
 229     struct iscsi_data data;
 230
 231     acb = qemu_aio_get(&iscsi_aiocb_info, bs, cb, opaque);
 232     trace_iscsi_aio_writev(iscsi, sector_num, nb_sectors, opaque, acb);
 233
 234     acb->iscsilun = iscsilun;
 235     acb->qiov     = qiov;
 236
 237     acb->canceled   = 0;
 238     acb->bh         = NULL;
 239     acb->status     = -EINPROGRESS;
 240
 241     /* XXX we should pass the iovec to write16 to avoid the extra copy */
 242     /* this will allow us to get rid of 'buf' completely */
 243     size = nb_sectors * BDRV_SECTOR_SIZE;
 244     acb->buf = g_malloc(size);
 245     qemu_iovec_to_buf(acb->qiov, 0, acb->buf, size);
 246
 247     acb->task = malloc(sizeof(struct scsi_task));
 248     if (acb->task == NULL) {
 249         error_report("iSCSI: Failed to allocate task for scsi WRITE16 "
 250                      "command. %s", iscsi_get_error(iscsi));
 251         qemu_aio_release(acb);
 252         return NULL;
 253     }
 254     memset(acb->task, 0, sizeof(struct scsi_task));
 255
 256     acb->task->xfer_dir = SCSI_XFER_WRITE;
 257     acb->task->cdb_size = 16;
 258     acb->task->cdb[0] = 0x8a;
 259     lba = sector_qemu2lun(sector_num, iscsilun);
 260     *(uint32_t *)&acb->task->cdb[2]  = htonl(lba >> 32);
 261     *(uint32_t *)&acb->task->cdb[6]  = htonl(lba & 0xffffffff);
 262     num_sectors = size / iscsilun->block_size;
 263     *(uint32_t *)&acb->task->cdb[10] = htonl(num_sectors);
 264     acb->task->expxferlen = size;
 265
 266     data.data = acb->buf;
 267     data.size = size;
 268
 269     if (iscsi_scsi_command_async(iscsi, iscsilun->lun, acb->task,
 270                                  iscsi_aio_write16_cb,
 271                                  &data,
 272                                  acb) != 0) {
 273         scsi_free_scsi_task(acb->task);
 274         g_free(acb->buf);
 275         qemu_aio_release(acb);
 276         return NULL;
 277     }
 278
 279     iscsi_set_events(iscsilun);
 280
 281     return &acb->common;
 282 }
 283
 284 static void
 285 iscsi_aio_read16_cb(struct iscsi_context *iscsi, int status,
 286                     void *command_data, void *opaque)
 287 {
 288     IscsiAIOCB *acb = opaque;
 289
 290     trace_iscsi_aio_read16_cb(iscsi, status, acb, acb->canceled);
 291
 292     if (acb->canceled != 0) {
 293         return;
 294     }
 295
 296     acb->status = 0;
 297     if (status != 0) {
 298         error_report("Failed to read16 data from iSCSI lun. %s",
 299                      iscsi_get_error(iscsi));
 300         acb->status = -EIO;
 301     }
 302
 303     iscsi_schedule_bh(acb);
 304 }
 305
 306 static BlockDriverAIOCB *
 307 iscsi_aio_readv(BlockDriverState *bs, int64_t sector_num,
 308                 QEMUIOVector *qiov, int nb_sectors,
 309                 BlockDriverCompletionFunc *cb,
 310                 void *opaque)
 311 {
 312     IscsiLun *iscsilun = bs->opaque;
 313     struct iscsi_context *iscsi = iscsilun->iscsi;
 314     IscsiAIOCB *acb;
 315     size_t qemu_read_size;
 316     int i;
 317     uint64_t lba;
 318     uint32_t num_sectors;
 319
 320     qemu_read_size = BDRV_SECTOR_SIZE * (size_t)nb_sectors;
 321
 322     acb = qemu_aio_get(&iscsi_aiocb_info, bs, cb, opaque);
 323     trace_iscsi_aio_readv(iscsi, sector_num, nb_sectors, opaque, acb);
 324
 325     acb->iscsilun = iscsilun;
 326     acb->qiov     = qiov;
 327
 328     acb->canceled    = 0;
 329     acb->bh          = NULL;
 330     acb->status      = -EINPROGRESS;
 331     acb->read_size   = qemu_read_size;
 332     acb->buf         = NULL;
 333
 334     /* If LUN blocksize is bigger than BDRV_BLOCK_SIZE a read from QEMU
 335      * may be misaligned to the LUN, so we may need to read some extra
 336      * data.
 337      */
 338     acb->read_offset = 0;
 339     if (iscsilun->block_size > BDRV_SECTOR_SIZE) {
 340         uint64_t bdrv_offset = BDRV_SECTOR_SIZE * sector_num;
 341
 342         acb->read_offset  = bdrv_offset % iscsilun->block_size;
 343     }
 344
 345     num_sectors  = (qemu_read_size + iscsilun->block_size
 346                     + acb->read_offset - 1)
 347                     / iscsilun->block_size;
 348
 349     acb->task = malloc(sizeof(struct scsi_task));
 350     if (acb->task == NULL) {
 351         error_report("iSCSI: Failed to allocate task for scsi READ16 "
 352                      "command. %s", iscsi_get_error(iscsi));
 353         qemu_aio_release(acb);
 354         return NULL;
 355     }
 356     memset(acb->task, 0, sizeof(struct scsi_task));
 357
 358     acb->task->xfer_dir = SCSI_XFER_READ;
 359     lba = sector_qemu2lun(sector_num, iscsilun);
 360     acb->task->expxferlen = qemu_read_size;
 361
 362     switch (iscsilun->type) {
 363     case TYPE_DISK:
 364         acb->task->cdb_size = 16;
 365         acb->task->cdb[0]  = 0x88;
 366         *(uint32_t *)&acb->task->cdb[2]  = htonl(lba >> 32);
 367         *(uint32_t *)&acb->task->cdb[6]  = htonl(lba & 0xffffffff);
 368         *(uint32_t *)&acb->task->cdb[10] = htonl(num_sectors);
 369         break;
 370     default:
 371         acb->task->cdb_size = 10;
 372         acb->task->cdb[0]  = 0x28;
 373         *(uint32_t *)&acb->task->cdb[2] = htonl(lba);
 374         *(uint16_t *)&acb->task->cdb[7] = htons(num_sectors);
 375         break;
 376     }
 377
 378     if (iscsi_scsi_command_async(iscsi, iscsilun->lun, acb->task,
 379                                  iscsi_aio_read16_cb,
 380                                  NULL,
 381                                  acb) != 0) {
 382         scsi_free_scsi_task(acb->task);
 383         qemu_aio_release(acb);
 384         return NULL;
 385     }
 386
 387     for (i = 0; i < acb->qiov->niov; i++) {
 388         scsi_task_add_data_in_buffer(acb->task,
 389                 acb->qiov->iov[i].iov_len,
 390                 acb->qiov->iov[i].iov_base);
 391     }
 392
 393     iscsi_set_events(iscsilun);
 394
 395     return &acb->common;
 396 }
 397
 398
 399 static void
 400 iscsi_synccache10_cb(struct iscsi_context *iscsi, int status,
 401                      void *command_data, void *opaque)
 402 {
 403     IscsiAIOCB *acb = opaque;
 404
 405     if (acb->canceled != 0) {
 406         return;
 407     }
 408
 409     acb->status = 0;
 410     if (status < 0) {
 411         error_report("Failed to sync10 data on iSCSI lun. %s",
 412                      iscsi_get_error(iscsi));
 413         acb->status = -EIO;
 414     }
 415
 416     iscsi_schedule_bh(acb);
 417 }
 418
 419 static BlockDriverAIOCB *
 420 iscsi_aio_flush(BlockDriverState *bs,
 421                 BlockDriverCompletionFunc *cb, void *opaque)
 422 {
 423     IscsiLun *iscsilun = bs->opaque;
 424     struct iscsi_context *iscsi = iscsilun->iscsi;
 425     IscsiAIOCB *acb;
 426
 427     acb = qemu_aio_get(&iscsi_aiocb_info, bs, cb, opaque);
 428
 429     acb->iscsilun = iscsilun;
 430     acb->canceled   = 0;
 431     acb->bh         = NULL;
 432     acb->status     = -EINPROGRESS;
 433
 434     acb->task = iscsi_synchronizecache10_task(iscsi, iscsilun->lun,
 435                                          0, 0, 0, 0,
 436                                          iscsi_synccache10_cb,
 437                                          acb);
 438     if (acb->task == NULL) {
 439         error_report("iSCSI: Failed to send synchronizecache10 command. %s",
 440                      iscsi_get_error(iscsi));
 441         qemu_aio_release(acb);
 442         return NULL;
 443     }
 444
 445     iscsi_set_events(iscsilun);
 446
 447     return &acb->common;
 448 }
 449
 450 static void
 451 iscsi_unmap_cb(struct iscsi_context *iscsi, int status,
 452                      void *command_data, void *opaque)
 453 {
 454     IscsiAIOCB *acb = opaque;
 455
 456     if (acb->canceled != 0) {
 457         return;
 458     }
 459
 460     acb->status = 0;
 461     if (status < 0) {
 462         error_report("Failed to unmap data on iSCSI lun. %s",
 463                      iscsi_get_error(iscsi));
 464         acb->status = -EIO;
 465     }
 466
 467     iscsi_schedule_bh(acb);
 468 }
 469
 470 static BlockDriverAIOCB *
 471 iscsi_aio_discard(BlockDriverState *bs,
 472                   int64_t sector_num, int nb_sectors,
 473                   BlockDriverCompletionFunc *cb, void *opaque)
 474 {
 475     IscsiLun *iscsilun = bs->opaque;
 476     struct iscsi_context *iscsi = iscsilun->iscsi;
 477     IscsiAIOCB *acb;
 478     struct unmap_list list[1];
 479
 480     acb = qemu_aio_get(&iscsi_aiocb_info, bs, cb, opaque);
 481
 482     acb->iscsilun = iscsilun;
 483     acb->canceled   = 0;
 484     acb->bh         = NULL;
 485     acb->status     = -EINPROGRESS;
 486
 487     list[0].lba = sector_qemu2lun(sector_num, iscsilun);
 488     list[0].num = nb_sectors * BDRV_SECTOR_SIZE / iscsilun->block_size;
 489
 490     acb->task = iscsi_unmap_task(iscsi, iscsilun->lun,
 491                                  0, 0, &list[0], 1,
 492                                  iscsi_unmap_cb,
 493                                  acb);
 494     if (acb->task == NULL) {
 495         error_report("iSCSI: Failed to send unmap command. %s",
 496                      iscsi_get_error(iscsi));
 497         qemu_aio_release(acb);
 498         return NULL;
 499     }
 500
 501     iscsi_set_events(iscsilun);
 502
 503     return &acb->common;
 504 }
 505
 506 #ifdef __linux__
 507 static void
 508 iscsi_aio_ioctl_cb(struct iscsi_context *iscsi, int status,
 509                      void *command_data, void *opaque)
 510 {
 511     IscsiAIOCB *acb = opaque;
 512
 513     if (acb->canceled != 0) {
 514         return;
 515     }
 516
 517     acb->status = 0;
 518     if (status < 0) {
 519         error_report("Failed to ioctl(SG_IO) to iSCSI lun. %s",
 520                      iscsi_get_error(iscsi));
 521         acb->status = -EIO;
 522     }
 523
 524     acb->ioh->driver_status = 0;
 525     acb->ioh->host_status   = 0;
 526     acb->ioh->resid         = 0;
 527
 528 #define SG_ERR_DRIVER_SENSE    0x08
 529
 530     if (status == SCSI_STATUS_CHECK_CONDITION && acb->task->datain.size >= 2) {
 531         int ss;
 532
 533         acb->ioh->driver_status |= SG_ERR_DRIVER_SENSE;
 534
 535         acb->ioh->sb_len_wr = acb->task->datain.size - 2;
 536         ss = (acb->ioh->mx_sb_len >= acb->ioh->sb_len_wr) ?
 537              acb->ioh->mx_sb_len : acb->ioh->sb_len_wr;
 538         memcpy(acb->ioh->sbp, &acb->task->datain.data[2], ss);
 539     }
 540
 541     iscsi_schedule_bh(acb);
 542 }
 543
 544 static BlockDriverAIOCB *iscsi_aio_ioctl(BlockDriverState *bs,
 545         unsigned long int req, void *buf,
 546         BlockDriverCompletionFunc *cb, void *opaque)
 547 {
 548     IscsiLun *iscsilun = bs->opaque;
 549     struct iscsi_context *iscsi = iscsilun->iscsi;
 550     struct iscsi_data data;
 551     IscsiAIOCB *acb;
 552
 553     assert(req == SG_IO);
 554
 555     acb = qemu_aio_get(&iscsi_aiocb_info, bs, cb, opaque);
 556
 557     acb->iscsilun = iscsilun;
 558     acb->canceled    = 0;
 559     acb->bh          = NULL;
 560     acb->status      = -EINPROGRESS;
 561     acb->buf         = NULL;
 562     acb->ioh         = buf;
 563
 564     acb->task = malloc(sizeof(struct scsi_task));
 565     if (acb->task == NULL) {
 566         error_report("iSCSI: Failed to allocate task for scsi command. %s",
 567                      iscsi_get_error(iscsi));
 568         qemu_aio_release(acb);
 569         return NULL;
 570     }
 571     memset(acb->task, 0, sizeof(struct scsi_task));
 572
 573     switch (acb->ioh->dxfer_direction) {
 574     case SG_DXFER_TO_DEV:
 575         acb->task->xfer_dir = SCSI_XFER_WRITE;
 576         break;
 577     case SG_DXFER_FROM_DEV:
 578         acb->task->xfer_dir = SCSI_XFER_READ;
 579         break;
 580     default:
 581         acb->task->xfer_dir = SCSI_XFER_NONE;
 582         break;
 583     }
 584
 585     acb->task->cdb_size = acb->ioh->cmd_len;
 586     memcpy(&acb->task->cdb[0], acb->ioh->cmdp, acb->ioh->cmd_len);
 587     acb->task->expxferlen = acb->ioh->dxfer_len;
 588
 589     if (acb->task->xfer_dir == SCSI_XFER_WRITE) {
 590         data.data = acb->ioh->dxferp;
 591         data.size = acb->ioh->dxfer_len;
 592     }
 593     if (iscsi_scsi_command_async(iscsi, iscsilun->lun, acb->task,
 594                                  iscsi_aio_ioctl_cb,
 595                                  (acb->task->xfer_dir == SCSI_XFER_WRITE) ?
 596                                      &data : NULL,
 597                                  acb) != 0) {
 598         scsi_free_scsi_task(acb->task);
 599         qemu_aio_release(acb);
 600         return NULL;
 601     }
 602
 603     /* tell libiscsi to read straight into the buffer we got from ioctl */
 604     if (acb->task->xfer_dir == SCSI_XFER_READ) {
 605         scsi_task_add_data_in_buffer(acb->task,
 606                                      acb->ioh->dxfer_len,
 607                                      acb->ioh->dxferp);
 608     }
 609
 610     iscsi_set_events(iscsilun);
 611
 612     return &acb->common;
 613 }
 614
 615
 616 static void ioctl_cb(void *opaque, int status)
 617 {
 618     int *p_status = opaque;
 619     *p_status = status;
 620 }
 621
 622 static int iscsi_ioctl(BlockDriverState *bs, unsigned long int req, void *buf)
 623 {
 624     IscsiLun *iscsilun = bs->opaque;
 625     int status;
 626
 627     switch (req) {
 628     case SG_GET_VERSION_NUM:
 629         *(int *)buf = 30000;
 630         break;
 631     case SG_GET_SCSI_ID:
 632         ((struct sg_scsi_id *)buf)->scsi_type = iscsilun->type;
 633         break;
 634     case SG_IO:
 635         status = -EINPROGRESS;
 636         iscsi_aio_ioctl(bs, req, buf, ioctl_cb, &status);
 637
 638         while (status == -EINPROGRESS) {
 639             qemu_aio_wait();
 640         }
 641
 642         return 0;
 643     default:
 644         return -1;
 645     }
 646     return 0;
 647 }
 648 #endif
 649
 650 static int64_t
 651 iscsi_getlength(BlockDriverState *bs)
 652 {
 653     IscsiLun *iscsilun = bs->opaque;
 654     int64_t len;
 655
 656     len  = iscsilun->num_blocks;
 657     len *= iscsilun->block_size;
 658
 659     return len;
 660 }
 661
 662 static int parse_chap(struct iscsi_context *iscsi, const char *target)
 663 {
 664     QemuOptsList *list;
 665     QemuOpts *opts;
 666     const char *user = NULL;
 667     const char *password = NULL;
 668
 669     list = qemu_find_opts("iscsi");
 670     if (!list) {
 671         return 0;
 672     }
 673
 674     opts = qemu_opts_find(list, target);
 675     if (opts == NULL) {
 676         opts = QTAILQ_FIRST(&list->head);
 677         if (!opts) {
 678             return 0;
 679         }
 680     }
 681
 682     user = qemu_opt_get(opts, "user");
 683     if (!user) {
 684         return 0;
 685     }
 686
 687     password = qemu_opt_get(opts, "password");
 688     if (!password) {
 689         error_report("CHAP username specified but no password was given");
 690         return -1;
 691     }
 692
 693     if (iscsi_set_initiator_username_pwd(iscsi, user, password)) {
 694         error_report("Failed to set initiator username and password");
 695         return -1;
 696     }
 697
 698     return 0;
 699 }
 700
 701 static void parse_header_digest(struct iscsi_context *iscsi, const char *target)
 702 {
 703     QemuOptsList *list;
 704     QemuOpts *opts;
 705     const char *digest = NULL;
 706
 707     list = qemu_find_opts("iscsi");
 708     if (!list) {
 709         return;
 710     }
 711
 712     opts = qemu_opts_find(list, target);
 713     if (opts == NULL) {
 714         opts = QTAILQ_FIRST(&list->head);
 715         if (!opts) {
 716             return;
 717         }
 718     }
 719
 720     digest = qemu_opt_get(opts, "header-digest");
 721     if (!digest) {
 722         return;
 723     }
 724
 725     if (!strcmp(digest, "CRC32C")) {
 726         iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_CRC32C);
 727     } else if (!strcmp(digest, "NONE")) {
 728         iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE);
 729     } else if (!strcmp(digest, "CRC32C-NONE")) {
 730         iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_CRC32C_NONE);
 731     } else if (!strcmp(digest, "NONE-CRC32C")) {
 732         iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE_CRC32C);
 733     } else {
 734         error_report("Invalid header-digest setting : %s", digest);
 735     }
 736 }
 737
 738 static char *parse_initiator_name(const char *target)
 739 {
 740     QemuOptsList *list;
 741     QemuOpts *opts;
 742     const char *name = NULL;
 743     const char *iscsi_name = qemu_get_vm_name();
 744
 745     list = qemu_find_opts("iscsi");
 746     if (list) {
 747         opts = qemu_opts_find(list, target);
 748         if (!opts) {
 749             opts = QTAILQ_FIRST(&list->head);
 750         }
 751         if (opts) {
 752             name = qemu_opt_get(opts, "initiator-name");
 753         }
 754     }
 755
 756     if (name) {
 757         return g_strdup(name);
 758     } else {
 759         return g_strdup_printf("iqn.2008-11.org.linux-kvm%s%s",
 760                                iscsi_name ? ":" : "",
 761                                iscsi_name ? iscsi_name : "");
 762     }
 763 }
 764
 765 /*
 766  * We support iscsi url's on the form
 767  * iscsi://[<username>%<password>@]<host>[:<port>]/<targetname>/<lun>
 768  */
 769 static int iscsi_open(BlockDriverState *bs, const char *filename, int flags)
 770 {
 771     IscsiLun *iscsilun = bs->opaque;
 772     struct iscsi_context *iscsi = NULL;
 773     struct iscsi_url *iscsi_url = NULL;
 774     struct scsi_task *task = NULL;
 775     struct scsi_inquiry_standard *inq = NULL;
 776     struct scsi_readcapacity10 *rc10 = NULL;
 777     struct scsi_readcapacity16 *rc16 = NULL;
 778     char *initiator_name = NULL;
 779     int ret;
 780
 781     if ((BDRV_SECTOR_SIZE % 512) != 0) {
 782         error_report("iSCSI: Invalid BDRV_SECTOR_SIZE. "
 783                      "BDRV_SECTOR_SIZE(%lld) is not a multiple "
 784                      "of 512", BDRV_SECTOR_SIZE);
 785         return -EINVAL;
 786     }
 787
 788     iscsi_url = iscsi_parse_full_url(iscsi, filename);
 789     if (iscsi_url == NULL) {
 790         error_report("Failed to parse URL : %s", filename);
 791         ret = -EINVAL;
 792         goto out;
 793     }
 794
 795     memset(iscsilun, 0, sizeof(IscsiLun));
 796
 797     initiator_name = parse_initiator_name(iscsi_url->target);
 798
 799     iscsi = iscsi_create_context(initiator_name);
 800     if (iscsi == NULL) {
 801         error_report("iSCSI: Failed to create iSCSI context.");
 802         ret = -ENOMEM;
 803         goto out;
 804     }
 805
 806     if (iscsi_set_targetname(iscsi, iscsi_url->target)) {
 807         error_report("iSCSI: Failed to set target name.");
 808         ret = -EINVAL;
 809         goto out;
 810     }
 811
 812     if (iscsi_url->user != NULL) {
 813         ret = iscsi_set_initiator_username_pwd(iscsi, iscsi_url->user,
 814                                               iscsi_url->passwd);
 815         if (ret != 0) {
 816             error_report("Failed to set initiator username and password");
 817             ret = -EINVAL;
 818             goto out;
 819         }
 820     }
 821
 822     /* check if we got CHAP username/password via the options */
 823     if (parse_chap(iscsi, iscsi_url->target) != 0) {
 824         error_report("iSCSI: Failed to set CHAP user/password");
 825         ret = -EINVAL;
 826         goto out;
 827     }
 828
 829     if (iscsi_set_session_type(iscsi, ISCSI_SESSION_NORMAL) != 0) {
 830         error_report("iSCSI: Failed to set session type to normal.");
 831         ret = -EINVAL;
 832         goto out;
 833     }
 834
 835     iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE_CRC32C);
 836
 837     /* check if we got HEADER_DIGEST via the options */
 838     parse_header_digest(iscsi, iscsi_url->target);
 839
 840     if (iscsi_full_connect_sync(iscsi, iscsi_url->portal, iscsi_url->lun) != 0) {
 841         error_report("iSCSI: Failed to connect to LUN : %s",
 842             iscsi_get_error(iscsi));
 843         ret = -EINVAL;
 844         goto out;
 845     }
 846
 847     iscsilun->iscsi = iscsi;
 848     iscsilun->lun   = iscsi_url->lun;
 849
 850     task = iscsi_inquiry_sync(iscsi, iscsilun->lun, 0, 0, 36);
 851
 852     if (task == NULL || task->status != SCSI_STATUS_GOOD) {
 853         error_report("iSCSI: failed to send inquiry command.");
 854         ret = -EINVAL;
 855         goto out;
 856     }
 857
 858     inq = scsi_datain_unmarshall(task);
 859     if (inq == NULL) {
 860         error_report("iSCSI: Failed to unmarshall inquiry data.");
 861         ret = -EINVAL;
 862         goto out;
 863     }
 864
 865     iscsilun->type = inq->periperal_device_type;
 866
 867     scsi_free_scsi_task(task);
 868
 869     switch (iscsilun->type) {
 870     case TYPE_DISK:
 871         task = iscsi_readcapacity16_sync(iscsi, iscsilun->lun);
 872         if (task == NULL || task->status != SCSI_STATUS_GOOD) {
 873             error_report("iSCSI: failed to send readcapacity16 command.");
 874             ret = -EINVAL;
 875             goto out;
 876         }
 877         rc16 = scsi_datain_unmarshall(task);
 878         if (rc16 == NULL) {
 879             error_report("iSCSI: Failed to unmarshall readcapacity16 data.");
 880             ret = -EINVAL;
 881             goto out;
 882         }
 883         iscsilun->block_size = rc16->block_length;
 884         iscsilun->num_blocks = rc16->returned_lba + 1;
 885         break;
 886     case TYPE_ROM:
 887         task = iscsi_readcapacity10_sync(iscsi, iscsilun->lun, 0, 0);
 888         if (task == NULL || task->status != SCSI_STATUS_GOOD) {
 889             error_report("iSCSI: failed to send readcapacity10 command.");
 890             ret = -EINVAL;
 891             goto out;
 892         }
 893         rc10 = scsi_datain_unmarshall(task);
 894         if (rc10 == NULL) {
 895             error_report("iSCSI: Failed to unmarshall readcapacity10 data.");
 896             ret = -EINVAL;
 897             goto out;
 898         }
 899         iscsilun->block_size = rc10->block_size;
 900         if (rc10->lba == 0) {
 901             /* blank disk loaded */
 902             iscsilun->num_blocks = 0;
 903         } else {
 904             iscsilun->num_blocks = rc10->lba + 1;
 905         }
 906         break;
 907     default:
 908         break;
 909     }
 910
 911     bs->total_sectors    = iscsilun->num_blocks *
 912                            iscsilun->block_size / BDRV_SECTOR_SIZE ;
 913
 914     /* Medium changer or tape. We dont have any emulation for this so this must
 915      * be sg ioctl compatible. We force it to be sg, otherwise qemu will try
 916      * to read from the device to guess the image format.
 917      */
 918     if (iscsilun->type == TYPE_MEDIUM_CHANGER ||
 919         iscsilun->type == TYPE_TAPE) {
 920         bs->sg = 1;
 921     }
 922
 923     ret = 0;
 924
 925 out:
 926     if (initiator_name != NULL) {
 927         g_free(initiator_name);
 928     }
 929     if (iscsi_url != NULL) {
 930         iscsi_destroy_url(iscsi_url);
 931     }
 932     if (task != NULL) {
 933         scsi_free_scsi_task(task);
 934     }
 935
 936     if (ret) {
 937         if (iscsi != NULL) {
 938             iscsi_destroy_context(iscsi);
 939         }
 940         memset(iscsilun, 0, sizeof(IscsiLun));
 941     }
 942     return ret;
 943 }
 944
 945 static void iscsi_close(BlockDriverState *bs)
 946 {
 947     IscsiLun *iscsilun = bs->opaque;
 948     struct iscsi_context *iscsi = iscsilun->iscsi;
 949
 950     qemu_aio_set_fd_handler(iscsi_get_fd(iscsi), NULL, NULL, NULL, NULL);
 951     iscsi_destroy_context(iscsi);
 952     memset(iscsilun, 0, sizeof(IscsiLun));
 953 }
 954
 955 static int iscsi_has_zero_init(BlockDriverState *bs)
 956 {
 957     return 0;
 958 }
 959
 960 static BlockDriver bdrv_iscsi = {
 961     .format_name     = "iscsi",
 962     .protocol_name   = "iscsi",
 963
 964     .instance_size   = sizeof(IscsiLun),
 965     .bdrv_file_open  = iscsi_open,
 966     .bdrv_close      = iscsi_close,
 967
 968     .bdrv_getlength  = iscsi_getlength,
 969
 970     .bdrv_aio_readv  = iscsi_aio_readv,
 971     .bdrv_aio_writev = iscsi_aio_writev,
 972     .bdrv_aio_flush  = iscsi_aio_flush,
 973
 974     .bdrv_aio_discard = iscsi_aio_discard,
 975     .bdrv_has_zero_init = iscsi_has_zero_init,
 976
 977 #ifdef __linux__
 978     .bdrv_ioctl       = iscsi_ioctl,
 979     .bdrv_aio_ioctl   = iscsi_aio_ioctl,
 980 #endif
 981 };
 982
 983 static void iscsi_block_init(void)
 984 {
 985     bdrv_register(&bdrv_iscsi);
 986 }
 987
 988 block_init(iscsi_block_init);