Merge remote-tracking branch 'remotes/kevin/tags/for-upstream' into staging
[qemu.git] / block / iscsi.c
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);