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[qemu/ar7.git] / block / iscsi.c
blobbd1f1bfcd10743b91246cf9f3bbc2597b0139c9a
1 /*
2 * QEMU Block driver for iSCSI images
3 *
4 * Copyright (c) 2010-2011 Ronnie Sahlberg <ronniesahlberg@gmail.com>
5 * Copyright (c) 2012-2015 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 <math.h>
30 #include <arpa/inet.h>
31 #include "qemu-common.h"
32 #include "qemu/config-file.h"
33 #include "qemu/error-report.h"
34 #include "qemu/bitops.h"
35 #include "qemu/bitmap.h"
36 #include "block/block_int.h"
37 #include "block/scsi.h"
38 #include "qemu/iov.h"
39 #include "sysemu/sysemu.h"
40 #include "qmp-commands.h"
41 #include "qapi/qmp/qstring.h"
42
43 #include <iscsi/iscsi.h>
44 #include <iscsi/scsi-lowlevel.h>
45
46 #ifdef __linux__
47 #include <scsi/sg.h>
48 #include <block/scsi.h>
49 #endif
50
51 typedef struct IscsiLun {
52 struct iscsi_context *iscsi;
53 AioContext *aio_context;
54 int lun;
55 enum scsi_inquiry_peripheral_device_type type;
56 int block_size;
57 uint64_t num_blocks;
58 int events;
59 QEMUTimer *nop_timer;
60 QEMUTimer *event_timer;
61 struct scsi_inquiry_logical_block_provisioning lbp;
62 struct scsi_inquiry_block_limits bl;
63 unsigned char *zeroblock;
64 unsigned long *allocationmap;
65 int cluster_sectors;
66 bool use_16_for_rw;
67 bool write_protected;
68 bool lbpme;
69 bool lbprz;
70 bool dpofua;
71 bool has_write_same;
72 bool force_next_flush;
73 bool request_timed_out;
74 } IscsiLun;
75
76 typedef struct IscsiTask {
77 int status;
78 int complete;
79 int retries;
80 int do_retry;
81 struct scsi_task *task;
82 Coroutine *co;
83 QEMUBH *bh;
84 IscsiLun *iscsilun;
85 QEMUTimer retry_timer;
86 bool force_next_flush;
87 int err_code;
88 } IscsiTask;
89
90 typedef struct IscsiAIOCB {
91 BlockAIOCB common;
92 QEMUIOVector *qiov;
93 QEMUBH *bh;
94 IscsiLun *iscsilun;
95 struct scsi_task *task;
96 uint8_t *buf;
97 int status;
98 int64_t sector_num;
99 int nb_sectors;
100 int ret;
101 #ifdef __linux__
102 sg_io_hdr_t *ioh;
103 #endif
104 } IscsiAIOCB;
105
106 /* libiscsi uses time_t so its enough to process events every second */
107 #define EVENT_INTERVAL 1000
108 #define NOP_INTERVAL 5000
109 #define MAX_NOP_FAILURES 3
110 #define ISCSI_CMD_RETRIES ARRAY_SIZE(iscsi_retry_times)
111 static const unsigned iscsi_retry_times[] = {8, 32, 128, 512, 2048, 8192, 32768};
112
113 /* this threshold is a trade-off knob to choose between
114 * the potential additional overhead of an extra GET_LBA_STATUS request
115 * vs. unnecessarily reading a lot of zero sectors over the wire.
116 * If a read request is greater or equal than ISCSI_CHECKALLOC_THRES
117 * sectors we check the allocation status of the area covered by the
118 * request first if the allocationmap indicates that the area might be
119 * unallocated. */
120 #define ISCSI_CHECKALLOC_THRES 64
121
122 static void
123 iscsi_bh_cb(void *p)
124 {
125 IscsiAIOCB *acb = p;
126
127 qemu_bh_delete(acb->bh);
128
129 g_free(acb->buf);
130 acb->buf = NULL;
131
132 acb->common.cb(acb->common.opaque, acb->status);
133
134 if (acb->task != NULL) {
135 scsi_free_scsi_task(acb->task);
136 acb->task = NULL;
137 }
138
139 qemu_aio_unref(acb);
140 }
141
142 static void
143 iscsi_schedule_bh(IscsiAIOCB *acb)
144 {
145 if (acb->bh) {
146 return;
147 }
148 acb->bh = aio_bh_new(acb->iscsilun->aio_context, iscsi_bh_cb, acb);
149 qemu_bh_schedule(acb->bh);
150 }
151
152 static void iscsi_co_generic_bh_cb(void *opaque)
153 {
154 struct IscsiTask *iTask = opaque;
155 iTask->complete = 1;
156 qemu_bh_delete(iTask->bh);
157 qemu_coroutine_enter(iTask->co, NULL);
158 }
159
160 static void iscsi_retry_timer_expired(void *opaque)
161 {
162 struct IscsiTask *iTask = opaque;
163 iTask->complete = 1;
164 if (iTask->co) {
165 qemu_coroutine_enter(iTask->co, NULL);
166 }
167 }
168
169 static inline unsigned exp_random(double mean)
170 {
171 return -mean * log((double)rand() / RAND_MAX);
172 }
173
174 /* SCSI_SENSE_ASCQ_INVALID_FIELD_IN_PARAMETER_LIST was introduced in
175 * libiscsi 1.10.0, together with other constants we need. Use it as
176 * a hint that we have to define them ourselves if needed, to keep the
177 * minimum required libiscsi version at 1.9.0. We use an ASCQ macro for
178 * the test because SCSI_STATUS_* is an enum.
179 *
180 * To guard against future changes where SCSI_SENSE_ASCQ_* also becomes
181 * an enum, check against the LIBISCSI_API_VERSION macro, which was
182 * introduced in 1.11.0. If it is present, there is no need to define
183 * anything.
184 */
185 #if !defined(SCSI_SENSE_ASCQ_INVALID_FIELD_IN_PARAMETER_LIST) && \
186 !defined(LIBISCSI_API_VERSION)
187 #define SCSI_STATUS_TASK_SET_FULL 0x28
188 #define SCSI_STATUS_TIMEOUT 0x0f000002
189 #define SCSI_SENSE_ASCQ_INVALID_FIELD_IN_PARAMETER_LIST 0x2600
190 #define SCSI_SENSE_ASCQ_PARAMETER_LIST_LENGTH_ERROR 0x1a00
191 #endif
192
193 static int iscsi_translate_sense(struct scsi_sense *sense)
194 {
195 int ret;
196
197 switch (sense->key) {
198 case SCSI_SENSE_NOT_READY:
199 return -EBUSY;
200 case SCSI_SENSE_DATA_PROTECTION:
201 return -EACCES;
202 case SCSI_SENSE_COMMAND_ABORTED:
203 return -ECANCELED;
204 case SCSI_SENSE_ILLEGAL_REQUEST:
205 /* Parse ASCQ */
206 break;
207 default:
208 return -EIO;
209 }
210 switch (sense->ascq) {
211 case SCSI_SENSE_ASCQ_PARAMETER_LIST_LENGTH_ERROR:
212 case SCSI_SENSE_ASCQ_INVALID_OPERATION_CODE:
213 case SCSI_SENSE_ASCQ_INVALID_FIELD_IN_CDB:
214 case SCSI_SENSE_ASCQ_INVALID_FIELD_IN_PARAMETER_LIST:
215 ret = -EINVAL;
216 break;
217 case SCSI_SENSE_ASCQ_LBA_OUT_OF_RANGE:
218 ret = -ENOSPC;
219 break;
220 case SCSI_SENSE_ASCQ_LOGICAL_UNIT_NOT_SUPPORTED:
221 ret = -ENOTSUP;
222 break;
223 case SCSI_SENSE_ASCQ_MEDIUM_NOT_PRESENT:
224 case SCSI_SENSE_ASCQ_MEDIUM_NOT_PRESENT_TRAY_CLOSED:
225 case SCSI_SENSE_ASCQ_MEDIUM_NOT_PRESENT_TRAY_OPEN:
226 ret = -ENOMEDIUM;
227 break;
228 case SCSI_SENSE_ASCQ_WRITE_PROTECTED:
229 ret = -EACCES;
230 break;
231 default:
232 ret = -EIO;
233 break;
234 }
235 return ret;
236 }
237
238 static void
239 iscsi_co_generic_cb(struct iscsi_context *iscsi, int status,
240 void *command_data, void *opaque)
241 {
242 struct IscsiTask *iTask = opaque;
243 struct scsi_task *task = command_data;
244
245 iTask->status = status;
246 iTask->do_retry = 0;
247 iTask->task = task;
248
249 if (status != SCSI_STATUS_GOOD) {
250 if (iTask->retries++ < ISCSI_CMD_RETRIES) {
251 if (status == SCSI_STATUS_CHECK_CONDITION
252 && task->sense.key == SCSI_SENSE_UNIT_ATTENTION) {
253 error_report("iSCSI CheckCondition: %s",
254 iscsi_get_error(iscsi));
255 iTask->do_retry = 1;
256 goto out;
257 }
258 if (status == SCSI_STATUS_BUSY ||
259 status == SCSI_STATUS_TIMEOUT ||
260 status == SCSI_STATUS_TASK_SET_FULL) {
261 unsigned retry_time =
262 exp_random(iscsi_retry_times[iTask->retries - 1]);
263 if (status == SCSI_STATUS_TIMEOUT) {
264 /* make sure the request is rescheduled AFTER the
265 * reconnect is initiated */
266 retry_time = EVENT_INTERVAL * 2;
267 iTask->iscsilun->request_timed_out = true;
268 }
269 error_report("iSCSI Busy/TaskSetFull/TimeOut"
270 " (retry #%u in %u ms): %s",
271 iTask->retries, retry_time,
272 iscsi_get_error(iscsi));
273 aio_timer_init(iTask->iscsilun->aio_context,
274 &iTask->retry_timer, QEMU_CLOCK_REALTIME,
275 SCALE_MS, iscsi_retry_timer_expired, iTask);
276 timer_mod(&iTask->retry_timer,
277 qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + retry_time);
278 iTask->do_retry = 1;
279 return;
280 }
281 }
282 iTask->err_code = iscsi_translate_sense(&task->sense);
283 error_report("iSCSI Failure: %s", iscsi_get_error(iscsi));
284 } else {
285 iTask->iscsilun->force_next_flush |= iTask->force_next_flush;
286 }
287
288 out:
289 if (iTask->co) {
290 iTask->bh = aio_bh_new(iTask->iscsilun->aio_context,
291 iscsi_co_generic_bh_cb, iTask);
292 qemu_bh_schedule(iTask->bh);
293 } else {
294 iTask->complete = 1;
295 }
296 }
297
298 static void iscsi_co_init_iscsitask(IscsiLun *iscsilun, struct IscsiTask *iTask)
299 {
300 *iTask = (struct IscsiTask) {
301 .co = qemu_coroutine_self(),
302 .iscsilun = iscsilun,
303 };
304 }
305
306 static void
307 iscsi_abort_task_cb(struct iscsi_context *iscsi, int status, void *command_data,
308 void *private_data)
309 {
310 IscsiAIOCB *acb = private_data;
311
312 acb->status = -ECANCELED;
313 iscsi_schedule_bh(acb);
314 }
315
316 static void
317 iscsi_aio_cancel(BlockAIOCB *blockacb)
318 {
319 IscsiAIOCB *acb = (IscsiAIOCB *)blockacb;
320 IscsiLun *iscsilun = acb->iscsilun;
321
322 if (acb->status != -EINPROGRESS) {
323 return;
324 }
325
326 /* send a task mgmt call to the target to cancel the task on the target */
327 iscsi_task_mgmt_abort_task_async(iscsilun->iscsi, acb->task,
328 iscsi_abort_task_cb, acb);
329
330 }
331
332 static const AIOCBInfo iscsi_aiocb_info = {
333 .aiocb_size = sizeof(IscsiAIOCB),
334 .cancel_async = iscsi_aio_cancel,
335 };
336
337
338 static void iscsi_process_read(void *arg);
339 static void iscsi_process_write(void *arg);
340
341 static void
342 iscsi_set_events(IscsiLun *iscsilun)
343 {
344 struct iscsi_context *iscsi = iscsilun->iscsi;
345 int ev = iscsi_which_events(iscsi);
346
347 if (ev != iscsilun->events) {
348 aio_set_fd_handler(iscsilun->aio_context, iscsi_get_fd(iscsi),
349 false,
350 (ev & POLLIN) ? iscsi_process_read : NULL,
351 (ev & POLLOUT) ? iscsi_process_write : NULL,
352 iscsilun);
353 iscsilun->events = ev;
354 }
355 }
356
357 static void iscsi_timed_check_events(void *opaque)
358 {
359 IscsiLun *iscsilun = opaque;
360
361 /* check for timed out requests */
362 iscsi_service(iscsilun->iscsi, 0);
363
364 if (iscsilun->request_timed_out) {
365 iscsilun->request_timed_out = false;
366 iscsi_reconnect(iscsilun->iscsi);
367 }
368
369 /* newer versions of libiscsi may return zero events. Ensure we are able
370 * to return to service once this situation changes. */
371 iscsi_set_events(iscsilun);
372
373 timer_mod(iscsilun->event_timer,
374 qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + EVENT_INTERVAL);
375 }
376
377 static void
378 iscsi_process_read(void *arg)
379 {
380 IscsiLun *iscsilun = arg;
381 struct iscsi_context *iscsi = iscsilun->iscsi;
382
383 iscsi_service(iscsi, POLLIN);
384 iscsi_set_events(iscsilun);
385 }
386
387 static void
388 iscsi_process_write(void *arg)
389 {
390 IscsiLun *iscsilun = arg;
391 struct iscsi_context *iscsi = iscsilun->iscsi;
392
393 iscsi_service(iscsi, POLLOUT);
394 iscsi_set_events(iscsilun);
395 }
396
397 static int64_t sector_lun2qemu(int64_t sector, IscsiLun *iscsilun)
398 {
399 return sector * iscsilun->block_size / BDRV_SECTOR_SIZE;
400 }
401
402 static int64_t sector_qemu2lun(int64_t sector, IscsiLun *iscsilun)
403 {
404 return sector * BDRV_SECTOR_SIZE / iscsilun->block_size;
405 }
406
407 static bool is_request_lun_aligned(int64_t sector_num, int nb_sectors,
408 IscsiLun *iscsilun)
409 {
410 if ((sector_num * BDRV_SECTOR_SIZE) % iscsilun->block_size ||
411 (nb_sectors * BDRV_SECTOR_SIZE) % iscsilun->block_size) {
412 error_report("iSCSI misaligned request: "
413 "iscsilun->block_size %u, sector_num %" PRIi64
414 ", nb_sectors %d",
415 iscsilun->block_size, sector_num, nb_sectors);
416 return 0;
417 }
418 return 1;
419 }
420
421 static unsigned long *iscsi_allocationmap_init(IscsiLun *iscsilun)
422 {
423 return bitmap_try_new(DIV_ROUND_UP(sector_lun2qemu(iscsilun->num_blocks,
424 iscsilun),
425 iscsilun->cluster_sectors));
426 }
427
428 static void iscsi_allocationmap_set(IscsiLun *iscsilun, int64_t sector_num,
429 int nb_sectors)
430 {
431 if (iscsilun->allocationmap == NULL) {
432 return;
433 }
434 bitmap_set(iscsilun->allocationmap,
435 sector_num / iscsilun->cluster_sectors,
436 DIV_ROUND_UP(nb_sectors, iscsilun->cluster_sectors));
437 }
438
439 static void iscsi_allocationmap_clear(IscsiLun *iscsilun, int64_t sector_num,
440 int nb_sectors)
441 {
442 int64_t cluster_num, nb_clusters;
443 if (iscsilun->allocationmap == NULL) {
444 return;
445 }
446 cluster_num = DIV_ROUND_UP(sector_num, iscsilun->cluster_sectors);
447 nb_clusters = (sector_num + nb_sectors) / iscsilun->cluster_sectors
448 - cluster_num;
449 if (nb_clusters > 0) {
450 bitmap_clear(iscsilun->allocationmap, cluster_num, nb_clusters);
451 }
452 }
453
454 static int coroutine_fn iscsi_co_writev(BlockDriverState *bs,
455 int64_t sector_num, int nb_sectors,
456 QEMUIOVector *iov)
457 {
458 IscsiLun *iscsilun = bs->opaque;
459 struct IscsiTask iTask;
460 uint64_t lba;
461 uint32_t num_sectors;
462 int fua;
463
464 if (!is_request_lun_aligned(sector_num, nb_sectors, iscsilun)) {
465 return -EINVAL;
466 }
467
468 if (bs->bl.max_transfer_length && nb_sectors > bs->bl.max_transfer_length) {
469 error_report("iSCSI Error: Write of %d sectors exceeds max_xfer_len "
470 "of %d sectors", nb_sectors, bs->bl.max_transfer_length);
471 return -EINVAL;
472 }
473
474 lba = sector_qemu2lun(sector_num, iscsilun);
475 num_sectors = sector_qemu2lun(nb_sectors, iscsilun);
476 iscsi_co_init_iscsitask(iscsilun, &iTask);
477 retry:
478 fua = iscsilun->dpofua && !bs->enable_write_cache;
479 iTask.force_next_flush = !fua;
480 if (iscsilun->use_16_for_rw) {
481 iTask.task = iscsi_write16_task(iscsilun->iscsi, iscsilun->lun, lba,
482 NULL, num_sectors * iscsilun->block_size,
483 iscsilun->block_size, 0, 0, fua, 0, 0,
484 iscsi_co_generic_cb, &iTask);
485 } else {
486 iTask.task = iscsi_write10_task(iscsilun->iscsi, iscsilun->lun, lba,
487 NULL, num_sectors * iscsilun->block_size,
488 iscsilun->block_size, 0, 0, fua, 0, 0,
489 iscsi_co_generic_cb, &iTask);
490 }
491 if (iTask.task == NULL) {
492 return -ENOMEM;
493 }
494 scsi_task_set_iov_out(iTask.task, (struct scsi_iovec *) iov->iov,
495 iov->niov);
496 while (!iTask.complete) {
497 iscsi_set_events(iscsilun);
498 qemu_coroutine_yield();
499 }
500
501 if (iTask.task != NULL) {
502 scsi_free_scsi_task(iTask.task);
503 iTask.task = NULL;
504 }
505
506 if (iTask.do_retry) {
507 iTask.complete = 0;
508 goto retry;
509 }
510
511 if (iTask.status != SCSI_STATUS_GOOD) {
512 return iTask.err_code;
513 }
514
515 iscsi_allocationmap_set(iscsilun, sector_num, nb_sectors);
516
517 return 0;
518 }
519
520
521 static bool iscsi_allocationmap_is_allocated(IscsiLun *iscsilun,
522 int64_t sector_num, int nb_sectors)
523 {
524 unsigned long size;
525 if (iscsilun->allocationmap == NULL) {
526 return true;
527 }
528 size = DIV_ROUND_UP(sector_num + nb_sectors, iscsilun->cluster_sectors);
529 return !(find_next_bit(iscsilun->allocationmap, size,
530 sector_num / iscsilun->cluster_sectors) == size);
531 }
532
533 static int64_t coroutine_fn iscsi_co_get_block_status(BlockDriverState *bs,
534 int64_t sector_num,
535 int nb_sectors, int *pnum)
536 {
537 IscsiLun *iscsilun = bs->opaque;
538 struct scsi_get_lba_status *lbas = NULL;
539 struct scsi_lba_status_descriptor *lbasd = NULL;
540 struct IscsiTask iTask;
541 int64_t ret;
542
543 iscsi_co_init_iscsitask(iscsilun, &iTask);
544
545 if (!is_request_lun_aligned(sector_num, nb_sectors, iscsilun)) {
546 ret = -EINVAL;
547 goto out;
548 }
549
550 /* default to all sectors allocated */
551 ret = BDRV_BLOCK_DATA;
552 ret |= (sector_num << BDRV_SECTOR_BITS) | BDRV_BLOCK_OFFSET_VALID;
553 *pnum = nb_sectors;
554
555 /* LUN does not support logical block provisioning */
556 if (!iscsilun->lbpme) {
557 goto out;
558 }
559
560 retry:
561 if (iscsi_get_lba_status_task(iscsilun->iscsi, iscsilun->lun,
562 sector_qemu2lun(sector_num, iscsilun),
563 8 + 16, iscsi_co_generic_cb,
564 &iTask) == NULL) {
565 ret = -ENOMEM;
566 goto out;
567 }
568
569 while (!iTask.complete) {
570 iscsi_set_events(iscsilun);
571 qemu_coroutine_yield();
572 }
573
574 if (iTask.do_retry) {
575 if (iTask.task != NULL) {
576 scsi_free_scsi_task(iTask.task);
577 iTask.task = NULL;
578 }
579 iTask.complete = 0;
580 goto retry;
581 }
582
583 if (iTask.status != SCSI_STATUS_GOOD) {
584 /* in case the get_lba_status_callout fails (i.e.
585 * because the device is busy or the cmd is not
586 * supported) we pretend all blocks are allocated
587 * for backwards compatibility */
588 goto out;
589 }
590
591 lbas = scsi_datain_unmarshall(iTask.task);
592 if (lbas == NULL) {
593 ret = -EIO;
594 goto out;
595 }
596
597 lbasd = &lbas->descriptors[0];
598
599 if (sector_qemu2lun(sector_num, iscsilun) != lbasd->lba) {
600 ret = -EIO;
601 goto out;
602 }
603
604 *pnum = sector_lun2qemu(lbasd->num_blocks, iscsilun);
605
606 if (lbasd->provisioning == SCSI_PROVISIONING_TYPE_DEALLOCATED ||
607 lbasd->provisioning == SCSI_PROVISIONING_TYPE_ANCHORED) {
608 ret &= ~BDRV_BLOCK_DATA;
609 if (iscsilun->lbprz) {
610 ret |= BDRV_BLOCK_ZERO;
611 }
612 }
613
614 if (ret & BDRV_BLOCK_ZERO) {
615 iscsi_allocationmap_clear(iscsilun, sector_num, *pnum);
616 } else {
617 iscsi_allocationmap_set(iscsilun, sector_num, *pnum);
618 }
619
620 if (*pnum > nb_sectors) {
621 *pnum = nb_sectors;
622 }
623 out:
624 if (iTask.task != NULL) {
625 scsi_free_scsi_task(iTask.task);
626 }
627 return ret;
628 }
629
630 static int coroutine_fn iscsi_co_readv(BlockDriverState *bs,
631 int64_t sector_num, int nb_sectors,
632 QEMUIOVector *iov)
633 {
634 IscsiLun *iscsilun = bs->opaque;
635 struct IscsiTask iTask;
636 uint64_t lba;
637 uint32_t num_sectors;
638
639 if (!is_request_lun_aligned(sector_num, nb_sectors, iscsilun)) {
640 return -EINVAL;
641 }
642
643 if (bs->bl.max_transfer_length && nb_sectors > bs->bl.max_transfer_length) {
644 error_report("iSCSI Error: Read of %d sectors exceeds max_xfer_len "
645 "of %d sectors", nb_sectors, bs->bl.max_transfer_length);
646 return -EINVAL;
647 }
648
649 if (iscsilun->lbprz && nb_sectors >= ISCSI_CHECKALLOC_THRES &&
650 !iscsi_allocationmap_is_allocated(iscsilun, sector_num, nb_sectors)) {
651 int64_t ret;
652 int pnum;
653 ret = iscsi_co_get_block_status(bs, sector_num, INT_MAX, &pnum);
654 if (ret < 0) {
655 return ret;
656 }
657 if (ret & BDRV_BLOCK_ZERO && pnum >= nb_sectors) {
658 qemu_iovec_memset(iov, 0, 0x00, iov->size);
659 return 0;
660 }
661 }
662
663 lba = sector_qemu2lun(sector_num, iscsilun);
664 num_sectors = sector_qemu2lun(nb_sectors, iscsilun);
665
666 iscsi_co_init_iscsitask(iscsilun, &iTask);
667 retry:
668 if (iscsilun->use_16_for_rw) {
669 iTask.task = iscsi_read16_task(iscsilun->iscsi, iscsilun->lun, lba,
670 num_sectors * iscsilun->block_size,
671 iscsilun->block_size, 0, 0, 0, 0, 0,
672 iscsi_co_generic_cb, &iTask);
673 } else {
674 iTask.task = iscsi_read10_task(iscsilun->iscsi, iscsilun->lun, lba,
675 num_sectors * iscsilun->block_size,
676 iscsilun->block_size,
677 0, 0, 0, 0, 0,
678 iscsi_co_generic_cb, &iTask);
679 }
680 if (iTask.task == NULL) {
681 return -ENOMEM;
682 }
683 scsi_task_set_iov_in(iTask.task, (struct scsi_iovec *) iov->iov, iov->niov);
684
685 while (!iTask.complete) {
686 iscsi_set_events(iscsilun);
687 qemu_coroutine_yield();
688 }
689
690 if (iTask.task != NULL) {
691 scsi_free_scsi_task(iTask.task);
692 iTask.task = NULL;
693 }
694
695 if (iTask.do_retry) {
696 iTask.complete = 0;
697 goto retry;
698 }
699
700 if (iTask.status != SCSI_STATUS_GOOD) {
701 return iTask.err_code;
702 }
703
704 return 0;
705 }
706
707 static int coroutine_fn iscsi_co_flush(BlockDriverState *bs)
708 {
709 IscsiLun *iscsilun = bs->opaque;
710 struct IscsiTask iTask;
711
712 if (!iscsilun->force_next_flush) {
713 return 0;
714 }
715 iscsilun->force_next_flush = false;
716
717 iscsi_co_init_iscsitask(iscsilun, &iTask);
718 retry:
719 if (iscsi_synchronizecache10_task(iscsilun->iscsi, iscsilun->lun, 0, 0, 0,
720 0, iscsi_co_generic_cb, &iTask) == NULL) {
721 return -ENOMEM;
722 }
723
724 while (!iTask.complete) {
725 iscsi_set_events(iscsilun);
726 qemu_coroutine_yield();
727 }
728
729 if (iTask.task != NULL) {
730 scsi_free_scsi_task(iTask.task);
731 iTask.task = NULL;
732 }
733
734 if (iTask.do_retry) {
735 iTask.complete = 0;
736 goto retry;
737 }
738
739 if (iTask.status != SCSI_STATUS_GOOD) {
740 return iTask.err_code;
741 }
742
743 return 0;
744 }
745
746 #ifdef __linux__
747 static void
748 iscsi_aio_ioctl_cb(struct iscsi_context *iscsi, int status,
749 void *command_data, void *opaque)
750 {
751 IscsiAIOCB *acb = opaque;
752
753 g_free(acb->buf);
754 acb->buf = NULL;
755
756 acb->status = 0;
757 if (status < 0) {
758 error_report("Failed to ioctl(SG_IO) to iSCSI lun. %s",
759 iscsi_get_error(iscsi));
760 acb->status = iscsi_translate_sense(&acb->task->sense);
761 }
762
763 acb->ioh->driver_status = 0;
764 acb->ioh->host_status = 0;
765 acb->ioh->resid = 0;
766
767 #define SG_ERR_DRIVER_SENSE 0x08
768
769 if (status == SCSI_STATUS_CHECK_CONDITION && acb->task->datain.size >= 2) {
770 int ss;
771
772 acb->ioh->driver_status |= SG_ERR_DRIVER_SENSE;
773
774 acb->ioh->sb_len_wr = acb->task->datain.size - 2;
775 ss = (acb->ioh->mx_sb_len >= acb->ioh->sb_len_wr) ?
776 acb->ioh->mx_sb_len : acb->ioh->sb_len_wr;
777 memcpy(acb->ioh->sbp, &acb->task->datain.data[2], ss);
778 }
779
780 iscsi_schedule_bh(acb);
781 }
782
783 static void iscsi_ioctl_bh_completion(void *opaque)
784 {
785 IscsiAIOCB *acb = opaque;
786
787 qemu_bh_delete(acb->bh);
788 acb->common.cb(acb->common.opaque, acb->ret);
789 qemu_aio_unref(acb);
790 }
791
792 static void iscsi_ioctl_handle_emulated(IscsiAIOCB *acb, int req, void *buf)
793 {
794 BlockDriverState *bs = acb->common.bs;
795 IscsiLun *iscsilun = bs->opaque;
796 int ret = 0;
797
798 switch (req) {
799 case SG_GET_VERSION_NUM:
800 *(int *)buf = 30000;
801 break;
802 case SG_GET_SCSI_ID:
803 ((struct sg_scsi_id *)buf)->scsi_type = iscsilun->type;
804 break;
805 default:
806 ret = -EINVAL;
807 }
808 assert(!acb->bh);
809 acb->bh = aio_bh_new(bdrv_get_aio_context(bs),
810 iscsi_ioctl_bh_completion, acb);
811 acb->ret = ret;
812 qemu_bh_schedule(acb->bh);
813 }
814
815 static BlockAIOCB *iscsi_aio_ioctl(BlockDriverState *bs,
816 unsigned long int req, void *buf,
817 BlockCompletionFunc *cb, void *opaque)
818 {
819 IscsiLun *iscsilun = bs->opaque;
820 struct iscsi_context *iscsi = iscsilun->iscsi;
821 struct iscsi_data data;
822 IscsiAIOCB *acb;
823
824 acb = qemu_aio_get(&iscsi_aiocb_info, bs, cb, opaque);
825
826 acb->iscsilun = iscsilun;
827 acb->bh = NULL;
828 acb->status = -EINPROGRESS;
829 acb->buf = NULL;
830 acb->ioh = buf;
831
832 if (req != SG_IO) {
833 iscsi_ioctl_handle_emulated(acb, req, buf);
834 return &acb->common;
835 }
836
837 acb->task = malloc(sizeof(struct scsi_task));
838 if (acb->task == NULL) {
839 error_report("iSCSI: Failed to allocate task for scsi command. %s",
840 iscsi_get_error(iscsi));
841 qemu_aio_unref(acb);
842 return NULL;
843 }
844 memset(acb->task, 0, sizeof(struct scsi_task));
845
846 switch (acb->ioh->dxfer_direction) {
847 case SG_DXFER_TO_DEV:
848 acb->task->xfer_dir = SCSI_XFER_WRITE;
849 break;
850 case SG_DXFER_FROM_DEV:
851 acb->task->xfer_dir = SCSI_XFER_READ;
852 break;
853 default:
854 acb->task->xfer_dir = SCSI_XFER_NONE;
855 break;
856 }
857
858 acb->task->cdb_size = acb->ioh->cmd_len;
859 memcpy(&acb->task->cdb[0], acb->ioh->cmdp, acb->ioh->cmd_len);
860 acb->task->expxferlen = acb->ioh->dxfer_len;
861
862 data.size = 0;
863 if (acb->task->xfer_dir == SCSI_XFER_WRITE) {
864 if (acb->ioh->iovec_count == 0) {
865 data.data = acb->ioh->dxferp;
866 data.size = acb->ioh->dxfer_len;
867 } else {
868 scsi_task_set_iov_out(acb->task,
869 (struct scsi_iovec *) acb->ioh->dxferp,
870 acb->ioh->iovec_count);
871 }
872 }
873
874 if (iscsi_scsi_command_async(iscsi, iscsilun->lun, acb->task,
875 iscsi_aio_ioctl_cb,
876 (data.size > 0) ? &data : NULL,
877 acb) != 0) {
878 scsi_free_scsi_task(acb->task);
879 qemu_aio_unref(acb);
880 return NULL;
881 }
882
883 /* tell libiscsi to read straight into the buffer we got from ioctl */
884 if (acb->task->xfer_dir == SCSI_XFER_READ) {
885 if (acb->ioh->iovec_count == 0) {
886 scsi_task_add_data_in_buffer(acb->task,
887 acb->ioh->dxfer_len,
888 acb->ioh->dxferp);
889 } else {
890 scsi_task_set_iov_in(acb->task,
891 (struct scsi_iovec *) acb->ioh->dxferp,
892 acb->ioh->iovec_count);
893 }
894 }
895
896 iscsi_set_events(iscsilun);
897
898 return &acb->common;
899 }
900
901 #endif
902
903 static int64_t
904 iscsi_getlength(BlockDriverState *bs)
905 {
906 IscsiLun *iscsilun = bs->opaque;
907 int64_t len;
908
909 len = iscsilun->num_blocks;
910 len *= iscsilun->block_size;
911
912 return len;
913 }
914
915 static int
916 coroutine_fn iscsi_co_discard(BlockDriverState *bs, int64_t sector_num,
917 int nb_sectors)
918 {
919 IscsiLun *iscsilun = bs->opaque;
920 struct IscsiTask iTask;
921 struct unmap_list list;
922
923 if (!is_request_lun_aligned(sector_num, nb_sectors, iscsilun)) {
924 return -EINVAL;
925 }
926
927 if (!iscsilun->lbp.lbpu) {
928 /* UNMAP is not supported by the target */
929 return 0;
930 }
931
932 list.lba = sector_qemu2lun(sector_num, iscsilun);
933 list.num = sector_qemu2lun(nb_sectors, iscsilun);
934
935 iscsi_co_init_iscsitask(iscsilun, &iTask);
936 retry:
937 if (iscsi_unmap_task(iscsilun->iscsi, iscsilun->lun, 0, 0, &list, 1,
938 iscsi_co_generic_cb, &iTask) == NULL) {
939 return -ENOMEM;
940 }
941
942 while (!iTask.complete) {
943 iscsi_set_events(iscsilun);
944 qemu_coroutine_yield();
945 }
946
947 if (iTask.task != NULL) {
948 scsi_free_scsi_task(iTask.task);
949 iTask.task = NULL;
950 }
951
952 if (iTask.do_retry) {
953 iTask.complete = 0;
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 iTask.err_code;
966 }
967
968 iscsi_allocationmap_clear(iscsilun, sector_num, nb_sectors);
969
970 return 0;
971 }
972
973 static int
974 coroutine_fn iscsi_co_write_zeroes(BlockDriverState *bs, int64_t sector_num,
975 int nb_sectors, BdrvRequestFlags flags)
976 {
977 IscsiLun *iscsilun = bs->opaque;
978 struct IscsiTask iTask;
979 uint64_t lba;
980 uint32_t nb_blocks;
981 bool use_16_for_ws = iscsilun->use_16_for_rw;
982
983 if (!is_request_lun_aligned(sector_num, nb_sectors, iscsilun)) {
984 return -EINVAL;
985 }
986
987 if (flags & BDRV_REQ_MAY_UNMAP) {
988 if (!use_16_for_ws && !iscsilun->lbp.lbpws10) {
989 /* WRITESAME10 with UNMAP is unsupported try WRITESAME16 */
990 use_16_for_ws = true;
991 }
992 if (use_16_for_ws && !iscsilun->lbp.lbpws) {
993 /* WRITESAME16 with UNMAP is not supported by the target,
994 * fall back and try WRITESAME10/16 without UNMAP */
995 flags &= ~BDRV_REQ_MAY_UNMAP;
996 use_16_for_ws = iscsilun->use_16_for_rw;
997 }
998 }
999
1000 if (!(flags & BDRV_REQ_MAY_UNMAP) && !iscsilun->has_write_same) {
1001 /* WRITESAME without UNMAP is not supported by the target */
1002 return -ENOTSUP;
1003 }
1004
1005 lba = sector_qemu2lun(sector_num, iscsilun);
1006 nb_blocks = sector_qemu2lun(nb_sectors, iscsilun);
1007
1008 if (iscsilun->zeroblock == NULL) {
1009 iscsilun->zeroblock = g_try_malloc0(iscsilun->block_size);
1010 if (iscsilun->zeroblock == NULL) {
1011 return -ENOMEM;
1012 }
1013 }
1014
1015 iscsi_co_init_iscsitask(iscsilun, &iTask);
1016 iTask.force_next_flush = true;
1017 retry:
1018 if (use_16_for_ws) {
1019 iTask.task = iscsi_writesame16_task(iscsilun->iscsi, iscsilun->lun, lba,
1020 iscsilun->zeroblock, iscsilun->block_size,
1021 nb_blocks, 0, !!(flags & BDRV_REQ_MAY_UNMAP),
1022 0, 0, iscsi_co_generic_cb, &iTask);
1023 } else {
1024 iTask.task = iscsi_writesame10_task(iscsilun->iscsi, iscsilun->lun, lba,
1025 iscsilun->zeroblock, iscsilun->block_size,
1026 nb_blocks, 0, !!(flags & BDRV_REQ_MAY_UNMAP),
1027 0, 0, iscsi_co_generic_cb, &iTask);
1028 }
1029 if (iTask.task == NULL) {
1030 return -ENOMEM;
1031 }
1032
1033 while (!iTask.complete) {
1034 iscsi_set_events(iscsilun);
1035 qemu_coroutine_yield();
1036 }
1037
1038 if (iTask.status == SCSI_STATUS_CHECK_CONDITION &&
1039 iTask.task->sense.key == SCSI_SENSE_ILLEGAL_REQUEST &&
1040 (iTask.task->sense.ascq == SCSI_SENSE_ASCQ_INVALID_OPERATION_CODE ||
1041 iTask.task->sense.ascq == SCSI_SENSE_ASCQ_INVALID_FIELD_IN_CDB)) {
1042 /* WRITE SAME is not supported by the target */
1043 iscsilun->has_write_same = false;
1044 scsi_free_scsi_task(iTask.task);
1045 return -ENOTSUP;
1046 }
1047
1048 if (iTask.task != NULL) {
1049 scsi_free_scsi_task(iTask.task);
1050 iTask.task = NULL;
1051 }
1052
1053 if (iTask.do_retry) {
1054 iTask.complete = 0;
1055 goto retry;
1056 }
1057
1058 if (iTask.status != SCSI_STATUS_GOOD) {
1059 return iTask.err_code;
1060 }
1061
1062 if (flags & BDRV_REQ_MAY_UNMAP) {
1063 iscsi_allocationmap_clear(iscsilun, sector_num, nb_sectors);
1064 } else {
1065 iscsi_allocationmap_set(iscsilun, sector_num, nb_sectors);
1066 }
1067
1068 return 0;
1069 }
1070
1071 static void parse_chap(struct iscsi_context *iscsi, const char *target,
1072 Error **errp)
1073 {
1074 QemuOptsList *list;
1075 QemuOpts *opts;
1076 const char *user = NULL;
1077 const char *password = NULL;
1078
1079 list = qemu_find_opts("iscsi");
1080 if (!list) {
1081 return;
1082 }
1083
1084 opts = qemu_opts_find(list, target);
1085 if (opts == NULL) {
1086 opts = QTAILQ_FIRST(&list->head);
1087 if (!opts) {
1088 return;
1089 }
1090 }
1091
1092 user = qemu_opt_get(opts, "user");
1093 if (!user) {
1094 return;
1095 }
1096
1097 password = qemu_opt_get(opts, "password");
1098 if (!password) {
1099 error_setg(errp, "CHAP username specified but no password was given");
1100 return;
1101 }
1102
1103 if (iscsi_set_initiator_username_pwd(iscsi, user, password)) {
1104 error_setg(errp, "Failed to set initiator username and password");
1105 }
1106 }
1107
1108 static void parse_header_digest(struct iscsi_context *iscsi, const char *target,
1109 Error **errp)
1110 {
1111 QemuOptsList *list;
1112 QemuOpts *opts;
1113 const char *digest = NULL;
1114
1115 list = qemu_find_opts("iscsi");
1116 if (!list) {
1117 return;
1118 }
1119
1120 opts = qemu_opts_find(list, target);
1121 if (opts == NULL) {
1122 opts = QTAILQ_FIRST(&list->head);
1123 if (!opts) {
1124 return;
1125 }
1126 }
1127
1128 digest = qemu_opt_get(opts, "header-digest");
1129 if (!digest) {
1130 return;
1131 }
1132
1133 if (!strcmp(digest, "CRC32C")) {
1134 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_CRC32C);
1135 } else if (!strcmp(digest, "NONE")) {
1136 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE);
1137 } else if (!strcmp(digest, "CRC32C-NONE")) {
1138 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_CRC32C_NONE);
1139 } else if (!strcmp(digest, "NONE-CRC32C")) {
1140 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE_CRC32C);
1141 } else {
1142 error_setg(errp, "Invalid header-digest setting : %s", digest);
1143 }
1144 }
1145
1146 static char *parse_initiator_name(const char *target)
1147 {
1148 QemuOptsList *list;
1149 QemuOpts *opts;
1150 const char *name;
1151 char *iscsi_name;
1152 UuidInfo *uuid_info;
1153
1154 list = qemu_find_opts("iscsi");
1155 if (list) {
1156 opts = qemu_opts_find(list, target);
1157 if (!opts) {
1158 opts = QTAILQ_FIRST(&list->head);
1159 }
1160 if (opts) {
1161 name = qemu_opt_get(opts, "initiator-name");
1162 if (name) {
1163 return g_strdup(name);
1164 }
1165 }
1166 }
1167
1168 uuid_info = qmp_query_uuid(NULL);
1169 if (strcmp(uuid_info->UUID, UUID_NONE) == 0) {
1170 name = qemu_get_vm_name();
1171 } else {
1172 name = uuid_info->UUID;
1173 }
1174 iscsi_name = g_strdup_printf("iqn.2008-11.org.linux-kvm%s%s",
1175 name ? ":" : "", name ? name : "");
1176 qapi_free_UuidInfo(uuid_info);
1177 return iscsi_name;
1178 }
1179
1180 static int parse_timeout(const char *target)
1181 {
1182 QemuOptsList *list;
1183 QemuOpts *opts;
1184 const char *timeout;
1185
1186 list = qemu_find_opts("iscsi");
1187 if (list) {
1188 opts = qemu_opts_find(list, target);
1189 if (!opts) {
1190 opts = QTAILQ_FIRST(&list->head);
1191 }
1192 if (opts) {
1193 timeout = qemu_opt_get(opts, "timeout");
1194 if (timeout) {
1195 return atoi(timeout);
1196 }
1197 }
1198 }
1199
1200 return 0;
1201 }
1202
1203 static void iscsi_nop_timed_event(void *opaque)
1204 {
1205 IscsiLun *iscsilun = opaque;
1206
1207 if (iscsi_get_nops_in_flight(iscsilun->iscsi) >= MAX_NOP_FAILURES) {
1208 error_report("iSCSI: NOP timeout. Reconnecting...");
1209 iscsilun->request_timed_out = true;
1210 } else if (iscsi_nop_out_async(iscsilun->iscsi, NULL, NULL, 0, NULL) != 0) {
1211 error_report("iSCSI: failed to sent NOP-Out. Disabling NOP messages.");
1212 return;
1213 }
1214
1215 timer_mod(iscsilun->nop_timer, qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + NOP_INTERVAL);
1216 iscsi_set_events(iscsilun);
1217 }
1218
1219 static void iscsi_readcapacity_sync(IscsiLun *iscsilun, Error **errp)
1220 {
1221 struct scsi_task *task = NULL;
1222 struct scsi_readcapacity10 *rc10 = NULL;
1223 struct scsi_readcapacity16 *rc16 = NULL;
1224 int retries = ISCSI_CMD_RETRIES;
1225
1226 do {
1227 if (task != NULL) {
1228 scsi_free_scsi_task(task);
1229 task = NULL;
1230 }
1231
1232 switch (iscsilun->type) {
1233 case TYPE_DISK:
1234 task = iscsi_readcapacity16_sync(iscsilun->iscsi, iscsilun->lun);
1235 if (task != NULL && task->status == SCSI_STATUS_GOOD) {
1236 rc16 = scsi_datain_unmarshall(task);
1237 if (rc16 == NULL) {
1238 error_setg(errp, "iSCSI: Failed to unmarshall readcapacity16 data.");
1239 } else {
1240 iscsilun->block_size = rc16->block_length;
1241 iscsilun->num_blocks = rc16->returned_lba + 1;
1242 iscsilun->lbpme = !!rc16->lbpme;
1243 iscsilun->lbprz = !!rc16->lbprz;
1244 iscsilun->use_16_for_rw = (rc16->returned_lba > 0xffffffff);
1245 }
1246 }
1247 break;
1248 case TYPE_ROM:
1249 task = iscsi_readcapacity10_sync(iscsilun->iscsi, iscsilun->lun, 0, 0);
1250 if (task != NULL && task->status == SCSI_STATUS_GOOD) {
1251 rc10 = scsi_datain_unmarshall(task);
1252 if (rc10 == NULL) {
1253 error_setg(errp, "iSCSI: Failed to unmarshall readcapacity10 data.");
1254 } else {
1255 iscsilun->block_size = rc10->block_size;
1256 if (rc10->lba == 0) {
1257 /* blank disk loaded */
1258 iscsilun->num_blocks = 0;
1259 } else {
1260 iscsilun->num_blocks = rc10->lba + 1;
1261 }
1262 }
1263 }
1264 break;
1265 default:
1266 return;
1267 }
1268 } while (task != NULL && task->status == SCSI_STATUS_CHECK_CONDITION
1269 && task->sense.key == SCSI_SENSE_UNIT_ATTENTION
1270 && retries-- > 0);
1271
1272 if (task == NULL || task->status != SCSI_STATUS_GOOD) {
1273 error_setg(errp, "iSCSI: failed to send readcapacity10 command.");
1274 } else if (!iscsilun->block_size ||
1275 iscsilun->block_size % BDRV_SECTOR_SIZE) {
1276 error_setg(errp, "iSCSI: the target returned an invalid "
1277 "block size of %d.", iscsilun->block_size);
1278 }
1279 if (task) {
1280 scsi_free_scsi_task(task);
1281 }
1282 }
1283
1284 /* TODO Convert to fine grained options */
1285 static QemuOptsList runtime_opts = {
1286 .name = "iscsi",
1287 .head = QTAILQ_HEAD_INITIALIZER(runtime_opts.head),
1288 .desc = {
1289 {
1290 .name = "filename",
1291 .type = QEMU_OPT_STRING,
1292 .help = "URL to the iscsi image",
1293 },
1294 { /* end of list */ }
1295 },
1296 };
1297
1298 static struct scsi_task *iscsi_do_inquiry(struct iscsi_context *iscsi, int lun,
1299 int evpd, int pc, void **inq, Error **errp)
1300 {
1301 int full_size;
1302 struct scsi_task *task = NULL;
1303 task = iscsi_inquiry_sync(iscsi, lun, evpd, pc, 64);
1304 if (task == NULL || task->status != SCSI_STATUS_GOOD) {
1305 goto fail;
1306 }
1307 full_size = scsi_datain_getfullsize(task);
1308 if (full_size > task->datain.size) {
1309 scsi_free_scsi_task(task);
1310
1311 /* we need more data for the full list */
1312 task = iscsi_inquiry_sync(iscsi, lun, evpd, pc, full_size);
1313 if (task == NULL || task->status != SCSI_STATUS_GOOD) {
1314 goto fail;
1315 }
1316 }
1317
1318 *inq = scsi_datain_unmarshall(task);
1319 if (*inq == NULL) {
1320 error_setg(errp, "iSCSI: failed to unmarshall inquiry datain blob");
1321 goto fail_with_err;
1322 }
1323
1324 return task;
1325
1326 fail:
1327 error_setg(errp, "iSCSI: Inquiry command failed : %s",
1328 iscsi_get_error(iscsi));
1329 fail_with_err:
1330 if (task != NULL) {
1331 scsi_free_scsi_task(task);
1332 }
1333 return NULL;
1334 }
1335
1336 static void iscsi_detach_aio_context(BlockDriverState *bs)
1337 {
1338 IscsiLun *iscsilun = bs->opaque;
1339
1340 aio_set_fd_handler(iscsilun->aio_context, iscsi_get_fd(iscsilun->iscsi),
1341 false, NULL, NULL, NULL);
1342 iscsilun->events = 0;
1343
1344 if (iscsilun->nop_timer) {
1345 timer_del(iscsilun->nop_timer);
1346 timer_free(iscsilun->nop_timer);
1347 iscsilun->nop_timer = NULL;
1348 }
1349 if (iscsilun->event_timer) {
1350 timer_del(iscsilun->event_timer);
1351 timer_free(iscsilun->event_timer);
1352 iscsilun->event_timer = NULL;
1353 }
1354 }
1355
1356 static void iscsi_attach_aio_context(BlockDriverState *bs,
1357 AioContext *new_context)
1358 {
1359 IscsiLun *iscsilun = bs->opaque;
1360
1361 iscsilun->aio_context = new_context;
1362 iscsi_set_events(iscsilun);
1363
1364 /* Set up a timer for sending out iSCSI NOPs */
1365 iscsilun->nop_timer = aio_timer_new(iscsilun->aio_context,
1366 QEMU_CLOCK_REALTIME, SCALE_MS,
1367 iscsi_nop_timed_event, iscsilun);
1368 timer_mod(iscsilun->nop_timer,
1369 qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + NOP_INTERVAL);
1370
1371 /* Set up a timer for periodic calls to iscsi_set_events and to
1372 * scan for command timeout */
1373 iscsilun->event_timer = aio_timer_new(iscsilun->aio_context,
1374 QEMU_CLOCK_REALTIME, SCALE_MS,
1375 iscsi_timed_check_events, iscsilun);
1376 timer_mod(iscsilun->event_timer,
1377 qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + EVENT_INTERVAL);
1378 }
1379
1380 static void iscsi_modesense_sync(IscsiLun *iscsilun)
1381 {
1382 struct scsi_task *task;
1383 struct scsi_mode_sense *ms = NULL;
1384 iscsilun->write_protected = false;
1385 iscsilun->dpofua = false;
1386
1387 task = iscsi_modesense6_sync(iscsilun->iscsi, iscsilun->lun,
1388 1, SCSI_MODESENSE_PC_CURRENT,
1389 0x3F, 0, 255);
1390 if (task == NULL) {
1391 error_report("iSCSI: Failed to send MODE_SENSE(6) command: %s",
1392 iscsi_get_error(iscsilun->iscsi));
1393 goto out;
1394 }
1395
1396 if (task->status != SCSI_STATUS_GOOD) {
1397 error_report("iSCSI: Failed MODE_SENSE(6), LUN assumed writable");
1398 goto out;
1399 }
1400 ms = scsi_datain_unmarshall(task);
1401 if (!ms) {
1402 error_report("iSCSI: Failed to unmarshall MODE_SENSE(6) data: %s",
1403 iscsi_get_error(iscsilun->iscsi));
1404 goto out;
1405 }
1406 iscsilun->write_protected = ms->device_specific_parameter & 0x80;
1407 iscsilun->dpofua = ms->device_specific_parameter & 0x10;
1408
1409 out:
1410 if (task) {
1411 scsi_free_scsi_task(task);
1412 }
1413 }
1414
1415 /*
1416 * We support iscsi url's on the form
1417 * iscsi://[<username>%<password>@]<host>[:<port>]/<targetname>/<lun>
1418 */
1419 static int iscsi_open(BlockDriverState *bs, QDict *options, int flags,
1420 Error **errp)
1421 {
1422 IscsiLun *iscsilun = bs->opaque;
1423 struct iscsi_context *iscsi = NULL;
1424 struct iscsi_url *iscsi_url = NULL;
1425 struct scsi_task *task = NULL;
1426 struct scsi_inquiry_standard *inq = NULL;
1427 struct scsi_inquiry_supported_pages *inq_vpd;
1428 char *initiator_name = NULL;
1429 QemuOpts *opts;
1430 Error *local_err = NULL;
1431 const char *filename;
1432 int i, ret = 0, timeout = 0;
1433
1434 opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort);
1435 qemu_opts_absorb_qdict(opts, options, &local_err);
1436 if (local_err) {
1437 error_propagate(errp, local_err);
1438 ret = -EINVAL;
1439 goto out;
1440 }
1441
1442 filename = qemu_opt_get(opts, "filename");
1443
1444 iscsi_url = iscsi_parse_full_url(iscsi, filename);
1445 if (iscsi_url == NULL) {
1446 error_setg(errp, "Failed to parse URL : %s", filename);
1447 ret = -EINVAL;
1448 goto out;
1449 }
1450
1451 memset(iscsilun, 0, sizeof(IscsiLun));
1452
1453 initiator_name = parse_initiator_name(iscsi_url->target);
1454
1455 iscsi = iscsi_create_context(initiator_name);
1456 if (iscsi == NULL) {
1457 error_setg(errp, "iSCSI: Failed to create iSCSI context.");
1458 ret = -ENOMEM;
1459 goto out;
1460 }
1461
1462 if (iscsi_set_targetname(iscsi, iscsi_url->target)) {
1463 error_setg(errp, "iSCSI: Failed to set target name.");
1464 ret = -EINVAL;
1465 goto out;
1466 }
1467
1468 if (iscsi_url->user[0] != '\0') {
1469 ret = iscsi_set_initiator_username_pwd(iscsi, iscsi_url->user,
1470 iscsi_url->passwd);
1471 if (ret != 0) {
1472 error_setg(errp, "Failed to set initiator username and password");
1473 ret = -EINVAL;
1474 goto out;
1475 }
1476 }
1477
1478 /* check if we got CHAP username/password via the options */
1479 parse_chap(iscsi, iscsi_url->target, &local_err);
1480 if (local_err != NULL) {
1481 error_propagate(errp, local_err);
1482 ret = -EINVAL;
1483 goto out;
1484 }
1485
1486 if (iscsi_set_session_type(iscsi, ISCSI_SESSION_NORMAL) != 0) {
1487 error_setg(errp, "iSCSI: Failed to set session type to normal.");
1488 ret = -EINVAL;
1489 goto out;
1490 }
1491
1492 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE_CRC32C);
1493
1494 /* check if we got HEADER_DIGEST via the options */
1495 parse_header_digest(iscsi, iscsi_url->target, &local_err);
1496 if (local_err != NULL) {
1497 error_propagate(errp, local_err);
1498 ret = -EINVAL;
1499 goto out;
1500 }
1501
1502 /* timeout handling is broken in libiscsi before 1.15.0 */
1503 timeout = parse_timeout(iscsi_url->target);
1504 #if defined(LIBISCSI_API_VERSION) && LIBISCSI_API_VERSION >= 20150621
1505 iscsi_set_timeout(iscsi, timeout);
1506 #else
1507 if (timeout) {
1508 error_report("iSCSI: ignoring timeout value for libiscsi <1.15.0");
1509 }
1510 #endif
1511
1512 if (iscsi_full_connect_sync(iscsi, iscsi_url->portal, iscsi_url->lun) != 0) {
1513 error_setg(errp, "iSCSI: Failed to connect to LUN : %s",
1514 iscsi_get_error(iscsi));
1515 ret = -EINVAL;
1516 goto out;
1517 }
1518
1519 iscsilun->iscsi = iscsi;
1520 iscsilun->aio_context = bdrv_get_aio_context(bs);
1521 iscsilun->lun = iscsi_url->lun;
1522 iscsilun->has_write_same = true;
1523
1524 task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 0, 0,
1525 (void **) &inq, errp);
1526 if (task == NULL) {
1527 ret = -EINVAL;
1528 goto out;
1529 }
1530 iscsilun->type = inq->periperal_device_type;
1531 scsi_free_scsi_task(task);
1532 task = NULL;
1533
1534 iscsi_modesense_sync(iscsilun);
1535
1536 /* Check the write protect flag of the LUN if we want to write */
1537 if (iscsilun->type == TYPE_DISK && (flags & BDRV_O_RDWR) &&
1538 iscsilun->write_protected) {
1539 error_setg(errp, "Cannot open a write protected LUN as read-write");
1540 ret = -EACCES;
1541 goto out;
1542 }
1543
1544 iscsi_readcapacity_sync(iscsilun, &local_err);
1545 if (local_err != NULL) {
1546 error_propagate(errp, local_err);
1547 ret = -EINVAL;
1548 goto out;
1549 }
1550 bs->total_sectors = sector_lun2qemu(iscsilun->num_blocks, iscsilun);
1551 bs->request_alignment = iscsilun->block_size;
1552
1553 /* We don't have any emulation for devices other than disks and CD-ROMs, so
1554 * this must be sg ioctl compatible. We force it to be sg, otherwise qemu
1555 * will try to read from the device to guess the image format.
1556 */
1557 if (iscsilun->type != TYPE_DISK && iscsilun->type != TYPE_ROM) {
1558 bs->sg = 1;
1559 }
1560
1561 task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1,
1562 SCSI_INQUIRY_PAGECODE_SUPPORTED_VPD_PAGES,
1563 (void **) &inq_vpd, errp);
1564 if (task == NULL) {
1565 ret = -EINVAL;
1566 goto out;
1567 }
1568 for (i = 0; i < inq_vpd->num_pages; i++) {
1569 struct scsi_task *inq_task;
1570 struct scsi_inquiry_logical_block_provisioning *inq_lbp;
1571 struct scsi_inquiry_block_limits *inq_bl;
1572 switch (inq_vpd->pages[i]) {
1573 case SCSI_INQUIRY_PAGECODE_LOGICAL_BLOCK_PROVISIONING:
1574 inq_task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1,
1575 SCSI_INQUIRY_PAGECODE_LOGICAL_BLOCK_PROVISIONING,
1576 (void **) &inq_lbp, errp);
1577 if (inq_task == NULL) {
1578 ret = -EINVAL;
1579 goto out;
1580 }
1581 memcpy(&iscsilun->lbp, inq_lbp,
1582 sizeof(struct scsi_inquiry_logical_block_provisioning));
1583 scsi_free_scsi_task(inq_task);
1584 break;
1585 case SCSI_INQUIRY_PAGECODE_BLOCK_LIMITS:
1586 inq_task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1,
1587 SCSI_INQUIRY_PAGECODE_BLOCK_LIMITS,
1588 (void **) &inq_bl, errp);
1589 if (inq_task == NULL) {
1590 ret = -EINVAL;
1591 goto out;
1592 }
1593 memcpy(&iscsilun->bl, inq_bl,
1594 sizeof(struct scsi_inquiry_block_limits));
1595 scsi_free_scsi_task(inq_task);
1596 break;
1597 default:
1598 break;
1599 }
1600 }
1601 scsi_free_scsi_task(task);
1602 task = NULL;
1603
1604 iscsi_attach_aio_context(bs, iscsilun->aio_context);
1605
1606 /* Guess the internal cluster (page) size of the iscsi target by the means
1607 * of opt_unmap_gran. Transfer the unmap granularity only if it has a
1608 * reasonable size */
1609 if (iscsilun->bl.opt_unmap_gran * iscsilun->block_size >= 4 * 1024 &&
1610 iscsilun->bl.opt_unmap_gran * iscsilun->block_size <= 16 * 1024 * 1024) {
1611 iscsilun->cluster_sectors = (iscsilun->bl.opt_unmap_gran *
1612 iscsilun->block_size) >> BDRV_SECTOR_BITS;
1613 if (iscsilun->lbprz) {
1614 iscsilun->allocationmap = iscsi_allocationmap_init(iscsilun);
1615 if (iscsilun->allocationmap == NULL) {
1616 ret = -ENOMEM;
1617 }
1618 }
1619 }
1620
1621 out:
1622 qemu_opts_del(opts);
1623 g_free(initiator_name);
1624 if (iscsi_url != NULL) {
1625 iscsi_destroy_url(iscsi_url);
1626 }
1627 if (task != NULL) {
1628 scsi_free_scsi_task(task);
1629 }
1630
1631 if (ret) {
1632 if (iscsi != NULL) {
1633 if (iscsi_is_logged_in(iscsi)) {
1634 iscsi_logout_sync(iscsi);
1635 }
1636 iscsi_destroy_context(iscsi);
1637 }
1638 memset(iscsilun, 0, sizeof(IscsiLun));
1639 }
1640 return ret;
1641 }
1642
1643 static void iscsi_close(BlockDriverState *bs)
1644 {
1645 IscsiLun *iscsilun = bs->opaque;
1646 struct iscsi_context *iscsi = iscsilun->iscsi;
1647
1648 iscsi_detach_aio_context(bs);
1649 if (iscsi_is_logged_in(iscsi)) {
1650 iscsi_logout_sync(iscsi);
1651 }
1652 iscsi_destroy_context(iscsi);
1653 g_free(iscsilun->zeroblock);
1654 g_free(iscsilun->allocationmap);
1655 memset(iscsilun, 0, sizeof(IscsiLun));
1656 }
1657
1658 static int sector_limits_lun2qemu(int64_t sector, IscsiLun *iscsilun)
1659 {
1660 return MIN(sector_lun2qemu(sector, iscsilun), INT_MAX / 2 + 1);
1661 }
1662
1663 static void iscsi_refresh_limits(BlockDriverState *bs, Error **errp)
1664 {
1665 /* We don't actually refresh here, but just return data queried in
1666 * iscsi_open(): iscsi targets don't change their limits. */
1667
1668 IscsiLun *iscsilun = bs->opaque;
1669 uint32_t max_xfer_len = iscsilun->use_16_for_rw ? 0xffffffff : 0xffff;
1670
1671 if (iscsilun->bl.max_xfer_len) {
1672 max_xfer_len = MIN(max_xfer_len, iscsilun->bl.max_xfer_len);
1673 }
1674
1675 bs->bl.max_transfer_length = sector_limits_lun2qemu(max_xfer_len, iscsilun);
1676
1677 if (iscsilun->lbp.lbpu) {
1678 if (iscsilun->bl.max_unmap < 0xffffffff) {
1679 bs->bl.max_discard =
1680 sector_limits_lun2qemu(iscsilun->bl.max_unmap, iscsilun);
1681 }
1682 bs->bl.discard_alignment =
1683 sector_limits_lun2qemu(iscsilun->bl.opt_unmap_gran, iscsilun);
1684 }
1685
1686 if (iscsilun->bl.max_ws_len < 0xffffffff) {
1687 bs->bl.max_write_zeroes =
1688 sector_limits_lun2qemu(iscsilun->bl.max_ws_len, iscsilun);
1689 }
1690 if (iscsilun->lbp.lbpws) {
1691 bs->bl.write_zeroes_alignment =
1692 sector_limits_lun2qemu(iscsilun->bl.opt_unmap_gran, iscsilun);
1693 }
1694 bs->bl.opt_transfer_length =
1695 sector_limits_lun2qemu(iscsilun->bl.opt_xfer_len, iscsilun);
1696 }
1697
1698 /* Note that this will not re-establish a connection with an iSCSI target - it
1699 * is effectively a NOP. */
1700 static int iscsi_reopen_prepare(BDRVReopenState *state,
1701 BlockReopenQueue *queue, Error **errp)
1702 {
1703 IscsiLun *iscsilun = state->bs->opaque;
1704
1705 if (state->flags & BDRV_O_RDWR && iscsilun->write_protected) {
1706 error_setg(errp, "Cannot open a write protected LUN as read-write");
1707 return -EACCES;
1708 }
1709 return 0;
1710 }
1711
1712 static int iscsi_truncate(BlockDriverState *bs, int64_t offset)
1713 {
1714 IscsiLun *iscsilun = bs->opaque;
1715 Error *local_err = NULL;
1716
1717 if (iscsilun->type != TYPE_DISK) {
1718 return -ENOTSUP;
1719 }
1720
1721 iscsi_readcapacity_sync(iscsilun, &local_err);
1722 if (local_err != NULL) {
1723 error_free(local_err);
1724 return -EIO;
1725 }
1726
1727 if (offset > iscsi_getlength(bs)) {
1728 return -EINVAL;
1729 }
1730
1731 if (iscsilun->allocationmap != NULL) {
1732 g_free(iscsilun->allocationmap);
1733 iscsilun->allocationmap = iscsi_allocationmap_init(iscsilun);
1734 }
1735
1736 return 0;
1737 }
1738
1739 static int iscsi_create(const char *filename, QemuOpts *opts, Error **errp)
1740 {
1741 int ret = 0;
1742 int64_t total_size = 0;
1743 BlockDriverState *bs;
1744 IscsiLun *iscsilun = NULL;
1745 QDict *bs_options;
1746
1747 bs = bdrv_new();
1748
1749 /* Read out options */
1750 total_size = DIV_ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0),
1751 BDRV_SECTOR_SIZE);
1752 bs->opaque = g_new0(struct IscsiLun, 1);
1753 iscsilun = bs->opaque;
1754
1755 bs_options = qdict_new();
1756 qdict_put(bs_options, "filename", qstring_from_str(filename));
1757 ret = iscsi_open(bs, bs_options, 0, NULL);
1758 QDECREF(bs_options);
1759
1760 if (ret != 0) {
1761 goto out;
1762 }
1763 iscsi_detach_aio_context(bs);
1764 if (iscsilun->type != TYPE_DISK) {
1765 ret = -ENODEV;
1766 goto out;
1767 }
1768 if (bs->total_sectors < total_size) {
1769 ret = -ENOSPC;
1770 goto out;
1771 }
1772
1773 ret = 0;
1774 out:
1775 if (iscsilun->iscsi != NULL) {
1776 iscsi_destroy_context(iscsilun->iscsi);
1777 }
1778 g_free(bs->opaque);
1779 bs->opaque = NULL;
1780 bdrv_unref(bs);
1781 return ret;
1782 }
1783
1784 static int iscsi_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
1785 {
1786 IscsiLun *iscsilun = bs->opaque;
1787 bdi->unallocated_blocks_are_zero = iscsilun->lbprz;
1788 bdi->can_write_zeroes_with_unmap = iscsilun->lbprz && iscsilun->lbp.lbpws;
1789 bdi->cluster_size = iscsilun->cluster_sectors * BDRV_SECTOR_SIZE;
1790 return 0;
1791 }
1792
1793 static QemuOptsList iscsi_create_opts = {
1794 .name = "iscsi-create-opts",
1795 .head = QTAILQ_HEAD_INITIALIZER(iscsi_create_opts.head),
1796 .desc = {
1797 {
1798 .name = BLOCK_OPT_SIZE,
1799 .type = QEMU_OPT_SIZE,
1800 .help = "Virtual disk size"
1801 },
1802 { /* end of list */ }
1803 }
1804 };
1805
1806 static BlockDriver bdrv_iscsi = {
1807 .format_name = "iscsi",
1808 .protocol_name = "iscsi",
1809
1810 .instance_size = sizeof(IscsiLun),
1811 .bdrv_needs_filename = true,
1812 .bdrv_file_open = iscsi_open,
1813 .bdrv_close = iscsi_close,
1814 .bdrv_create = iscsi_create,
1815 .create_opts = &iscsi_create_opts,
1816 .bdrv_reopen_prepare = iscsi_reopen_prepare,
1817
1818 .bdrv_getlength = iscsi_getlength,
1819 .bdrv_get_info = iscsi_get_info,
1820 .bdrv_truncate = iscsi_truncate,
1821 .bdrv_refresh_limits = iscsi_refresh_limits,
1822
1823 .bdrv_co_get_block_status = iscsi_co_get_block_status,
1824 .bdrv_co_discard = iscsi_co_discard,
1825 .bdrv_co_write_zeroes = iscsi_co_write_zeroes,
1826 .bdrv_co_readv = iscsi_co_readv,
1827 .bdrv_co_writev = iscsi_co_writev,
1828 .bdrv_co_flush_to_disk = iscsi_co_flush,
1829
1830 #ifdef __linux__
1831 .bdrv_aio_ioctl = iscsi_aio_ioctl,
1832 #endif
1833
1834 .bdrv_detach_aio_context = iscsi_detach_aio_context,
1835 .bdrv_attach_aio_context = iscsi_attach_aio_context,
1836 };
1837
1838 static QemuOptsList qemu_iscsi_opts = {
1839 .name = "iscsi",
1840 .head = QTAILQ_HEAD_INITIALIZER(qemu_iscsi_opts.head),
1841 .desc = {
1842 {
1843 .name = "user",
1844 .type = QEMU_OPT_STRING,
1845 .help = "username for CHAP authentication to target",
1846 },{
1847 .name = "password",
1848 .type = QEMU_OPT_STRING,
1849 .help = "password for CHAP authentication to target",
1850 },{
1851 .name = "header-digest",
1852 .type = QEMU_OPT_STRING,
1853 .help = "HeaderDigest setting. "
1854 "{CRC32C|CRC32C-NONE|NONE-CRC32C|NONE}",
1855 },{
1856 .name = "initiator-name",
1857 .type = QEMU_OPT_STRING,
1858 .help = "Initiator iqn name to use when connecting",
1859 },{
1860 .name = "timeout",
1861 .type = QEMU_OPT_NUMBER,
1862 .help = "Request timeout in seconds (default 0 = no timeout)",
1863 },
1864 { /* end of list */ }
1865 },
1866 };
1867
1868 static void iscsi_block_init(void)
1869 {
1870 bdrv_register(&bdrv_iscsi);
1871 qemu_add_opts(&qemu_iscsi_opts);
1872 }
1873
1874 block_init(iscsi_block_init);
AR7 emulation for QEMU