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nbd: Tolerate more errors to structured reply request
[qemu/ar7.git] / block / iscsi.c
blob506bf5f87570fed229eb98b9997720a6b1000311
1 /*
2 * QEMU Block driver for iSCSI images
3 *
4 * Copyright (c) 2010-2011 Ronnie Sahlberg <ronniesahlberg@gmail.com>
5 * Copyright (c) 2012-2017 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 "qemu/osdep.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/qdict.h"
38 #include "scsi/constants.h"
39 #include "qemu/iov.h"
40 #include "qemu/module.h"
41 #include "qemu/option.h"
42 #include "qemu/uuid.h"
43 #include "qapi/error.h"
44 #include "qapi/qapi-commands-misc.h"
45 #include "qapi/qmp/qdict.h"
46 #include "qapi/qmp/qstring.h"
47 #include "crypto/secret.h"
48 #include "scsi/utils.h"
49 #include "trace.h"
50
51 /* Conflict between scsi/utils.h and libiscsi! :( */
52 #define SCSI_XFER_NONE ISCSI_XFER_NONE
53 #include <iscsi/iscsi.h>
54 #define inline __attribute__((gnu_inline)) /* required for libiscsi v1.9.0 */
55 #include <iscsi/scsi-lowlevel.h>
56 #undef inline
57 #undef SCSI_XFER_NONE
58 QEMU_BUILD_BUG_ON((int)SCSI_XFER_NONE != (int)ISCSI_XFER_NONE);
59
60 #ifdef __linux__
61 #include <scsi/sg.h>
62 #endif
63
64 typedef struct IscsiLun {
65 struct iscsi_context *iscsi;
66 AioContext *aio_context;
67 int lun;
68 enum scsi_inquiry_peripheral_device_type type;
69 int block_size;
70 uint64_t num_blocks;
71 int events;
72 QEMUTimer *nop_timer;
73 QEMUTimer *event_timer;
74 QemuMutex mutex;
75 struct scsi_inquiry_logical_block_provisioning lbp;
76 struct scsi_inquiry_block_limits bl;
77 struct scsi_inquiry_device_designator *dd;
78 unsigned char *zeroblock;
79 /* The allocmap tracks which clusters (pages) on the iSCSI target are
80 * allocated and which are not. In case a target returns zeros for
81 * unallocated pages (iscsilun->lprz) we can directly return zeros instead
82 * of reading zeros over the wire if a read request falls within an
83 * unallocated block. As there are 3 possible states we need 2 bitmaps to
84 * track. allocmap_valid keeps track if QEMU's information about a page is
85 * valid. allocmap tracks if a page is allocated or not. In case QEMU has no
86 * valid information about a page the corresponding allocmap entry should be
87 * switched to unallocated as well to force a new lookup of the allocation
88 * status as lookups are generally skipped if a page is suspect to be
89 * allocated. If a iSCSI target is opened with cache.direct = on the
90 * allocmap_valid does not exist turning all cached information invalid so
91 * that a fresh lookup is made for any page even if allocmap entry returns
92 * it's unallocated. */
93 unsigned long *allocmap;
94 unsigned long *allocmap_valid;
95 long allocmap_size;
96 int cluster_size;
97 bool use_16_for_rw;
98 bool write_protected;
99 bool lbpme;
100 bool lbprz;
101 bool dpofua;
102 bool has_write_same;
103 bool request_timed_out;
104 } IscsiLun;
105
106 typedef struct IscsiTask {
107 int status;
108 int complete;
109 int retries;
110 int do_retry;
111 struct scsi_task *task;
112 Coroutine *co;
113 IscsiLun *iscsilun;
114 QEMUTimer retry_timer;
115 int err_code;
116 char *err_str;
117 } IscsiTask;
118
119 typedef struct IscsiAIOCB {
120 BlockAIOCB common;
121 QEMUBH *bh;
122 IscsiLun *iscsilun;
123 struct scsi_task *task;
124 int status;
125 int64_t sector_num;
126 int nb_sectors;
127 int ret;
128 #ifdef __linux__
129 sg_io_hdr_t *ioh;
130 #endif
131 bool cancelled;
132 } IscsiAIOCB;
133
134 /* libiscsi uses time_t so its enough to process events every second */
135 #define EVENT_INTERVAL 1000
136 #define NOP_INTERVAL 5000
137 #define MAX_NOP_FAILURES 3
138 #define ISCSI_CMD_RETRIES ARRAY_SIZE(iscsi_retry_times)
139 static const unsigned iscsi_retry_times[] = {8, 32, 128, 512, 2048, 8192, 32768};
140
141 /* this threshold is a trade-off knob to choose between
142 * the potential additional overhead of an extra GET_LBA_STATUS request
143 * vs. unnecessarily reading a lot of zero sectors over the wire.
144 * If a read request is greater or equal than ISCSI_CHECKALLOC_THRES
145 * sectors we check the allocation status of the area covered by the
146 * request first if the allocationmap indicates that the area might be
147 * unallocated. */
148 #define ISCSI_CHECKALLOC_THRES 64
149
150 #ifdef __linux__
151
152 static void
153 iscsi_bh_cb(void *p)
154 {
155 IscsiAIOCB *acb = p;
156
157 qemu_bh_delete(acb->bh);
158
159 acb->common.cb(acb->common.opaque, acb->status);
160
161 if (acb->task != NULL) {
162 scsi_free_scsi_task(acb->task);
163 acb->task = NULL;
164 }
165
166 qemu_aio_unref(acb);
167 }
168
169 static void
170 iscsi_schedule_bh(IscsiAIOCB *acb)
171 {
172 if (acb->bh) {
173 return;
174 }
175 acb->bh = aio_bh_new(acb->iscsilun->aio_context, iscsi_bh_cb, acb);
176 qemu_bh_schedule(acb->bh);
177 }
178
179 #endif
180
181 static void iscsi_co_generic_bh_cb(void *opaque)
182 {
183 struct IscsiTask *iTask = opaque;
184
185 iTask->complete = 1;
186 aio_co_wake(iTask->co);
187 }
188
189 static void iscsi_retry_timer_expired(void *opaque)
190 {
191 struct IscsiTask *iTask = opaque;
192 iTask->complete = 1;
193 if (iTask->co) {
194 aio_co_wake(iTask->co);
195 }
196 }
197
198 static inline unsigned exp_random(double mean)
199 {
200 return -mean * log((double)rand() / RAND_MAX);
201 }
202
203 /* SCSI_SENSE_ASCQ_INVALID_FIELD_IN_PARAMETER_LIST was introduced in
204 * libiscsi 1.10.0, together with other constants we need. Use it as
205 * a hint that we have to define them ourselves if needed, to keep the
206 * minimum required libiscsi version at 1.9.0. We use an ASCQ macro for
207 * the test because SCSI_STATUS_* is an enum.
208 *
209 * To guard against future changes where SCSI_SENSE_ASCQ_* also becomes
210 * an enum, check against the LIBISCSI_API_VERSION macro, which was
211 * introduced in 1.11.0. If it is present, there is no need to define
212 * anything.
213 */
214 #if !defined(SCSI_SENSE_ASCQ_INVALID_FIELD_IN_PARAMETER_LIST) && \
215 !defined(LIBISCSI_API_VERSION)
216 #define SCSI_STATUS_TASK_SET_FULL 0x28
217 #define SCSI_STATUS_TIMEOUT 0x0f000002
218 #define SCSI_SENSE_ASCQ_INVALID_FIELD_IN_PARAMETER_LIST 0x2600
219 #define SCSI_SENSE_ASCQ_PARAMETER_LIST_LENGTH_ERROR 0x1a00
220 #endif
221
222 #ifndef LIBISCSI_API_VERSION
223 #define LIBISCSI_API_VERSION 20130701
224 #endif
225
226 static int iscsi_translate_sense(struct scsi_sense *sense)
227 {
228 return scsi_sense_to_errno(sense->key,
229 (sense->ascq & 0xFF00) >> 8,
230 sense->ascq & 0xFF);
231 }
232
233 /* Called (via iscsi_service) with QemuMutex held. */
234 static void
235 iscsi_co_generic_cb(struct iscsi_context *iscsi, int status,
236 void *command_data, void *opaque)
237 {
238 struct IscsiTask *iTask = opaque;
239 struct scsi_task *task = command_data;
240
241 iTask->status = status;
242 iTask->do_retry = 0;
243 iTask->task = task;
244
245 if (status != SCSI_STATUS_GOOD) {
246 if (iTask->retries++ < ISCSI_CMD_RETRIES) {
247 if (status == SCSI_STATUS_BUSY ||
248 status == SCSI_STATUS_TIMEOUT ||
249 status == SCSI_STATUS_TASK_SET_FULL) {
250 unsigned retry_time =
251 exp_random(iscsi_retry_times[iTask->retries - 1]);
252 if (status == SCSI_STATUS_TIMEOUT) {
253 /* make sure the request is rescheduled AFTER the
254 * reconnect is initiated */
255 retry_time = EVENT_INTERVAL * 2;
256 iTask->iscsilun->request_timed_out = true;
257 }
258 error_report("iSCSI Busy/TaskSetFull/TimeOut"
259 " (retry #%u in %u ms): %s",
260 iTask->retries, retry_time,
261 iscsi_get_error(iscsi));
262 aio_timer_init(iTask->iscsilun->aio_context,
263 &iTask->retry_timer, QEMU_CLOCK_REALTIME,
264 SCALE_MS, iscsi_retry_timer_expired, iTask);
265 timer_mod(&iTask->retry_timer,
266 qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + retry_time);
267 iTask->do_retry = 1;
268 }
269 } else if (status == SCSI_STATUS_CHECK_CONDITION) {
270 int error = iscsi_translate_sense(&task->sense);
271 if (error == EAGAIN) {
272 error_report("iSCSI CheckCondition: %s",
273 iscsi_get_error(iscsi));
274 iTask->do_retry = 1;
275 } else {
276 iTask->err_code = -error;
277 iTask->err_str = g_strdup(iscsi_get_error(iscsi));
278 }
279 }
280 }
281
282 if (iTask->co) {
283 aio_bh_schedule_oneshot(iTask->iscsilun->aio_context,
284 iscsi_co_generic_bh_cb, iTask);
285 } else {
286 iTask->complete = 1;
287 }
288 }
289
290 static void iscsi_co_init_iscsitask(IscsiLun *iscsilun, struct IscsiTask *iTask)
291 {
292 *iTask = (struct IscsiTask) {
293 .co = qemu_coroutine_self(),
294 .iscsilun = iscsilun,
295 };
296 }
297
298 #ifdef __linux__
299
300 /* Called (via iscsi_service) with QemuMutex held. */
301 static void
302 iscsi_abort_task_cb(struct iscsi_context *iscsi, int status, void *command_data,
303 void *private_data)
304 {
305 IscsiAIOCB *acb = private_data;
306
307 /* If the command callback hasn't been called yet, drop the task */
308 if (!acb->bh) {
309 /* Call iscsi_aio_ioctl_cb() with SCSI_STATUS_CANCELLED */
310 iscsi_scsi_cancel_task(iscsi, acb->task);
311 }
312
313 qemu_aio_unref(acb); /* acquired in iscsi_aio_cancel() */
314 }
315
316 static void
317 iscsi_aio_cancel(BlockAIOCB *blockacb)
318 {
319 IscsiAIOCB *acb = (IscsiAIOCB *)blockacb;
320 IscsiLun *iscsilun = acb->iscsilun;
321
322 qemu_mutex_lock(&iscsilun->mutex);
323
324 /* If it was cancelled or completed already, our work is done here */
325 if (acb->cancelled || acb->status != -EINPROGRESS) {
326 qemu_mutex_unlock(&iscsilun->mutex);
327 return;
328 }
329
330 acb->cancelled = true;
331
332 qemu_aio_ref(acb); /* released in iscsi_abort_task_cb() */
333
334 /* send a task mgmt call to the target to cancel the task on the target */
335 if (iscsi_task_mgmt_abort_task_async(iscsilun->iscsi, acb->task,
336 iscsi_abort_task_cb, acb) < 0) {
337 qemu_aio_unref(acb); /* since iscsi_abort_task_cb() won't be called */
338 }
339
340 qemu_mutex_unlock(&iscsilun->mutex);
341 }
342
343 static const AIOCBInfo iscsi_aiocb_info = {
344 .aiocb_size = sizeof(IscsiAIOCB),
345 .cancel_async = iscsi_aio_cancel,
346 };
347
348 #endif
349
350 static void iscsi_process_read(void *arg);
351 static void iscsi_process_write(void *arg);
352
353 /* Called with QemuMutex held. */
354 static void
355 iscsi_set_events(IscsiLun *iscsilun)
356 {
357 struct iscsi_context *iscsi = iscsilun->iscsi;
358 int ev = iscsi_which_events(iscsi);
359
360 if (ev != iscsilun->events) {
361 aio_set_fd_handler(iscsilun->aio_context, iscsi_get_fd(iscsi),
362 false,
363 (ev & POLLIN) ? iscsi_process_read : NULL,
364 (ev & POLLOUT) ? iscsi_process_write : NULL,
365 NULL,
366 iscsilun);
367 iscsilun->events = ev;
368 }
369 }
370
371 static void iscsi_timed_check_events(void *opaque)
372 {
373 IscsiLun *iscsilun = opaque;
374
375 qemu_mutex_lock(&iscsilun->mutex);
376
377 /* check for timed out requests */
378 iscsi_service(iscsilun->iscsi, 0);
379
380 if (iscsilun->request_timed_out) {
381 iscsilun->request_timed_out = false;
382 iscsi_reconnect(iscsilun->iscsi);
383 }
384
385 /* newer versions of libiscsi may return zero events. Ensure we are able
386 * to return to service once this situation changes. */
387 iscsi_set_events(iscsilun);
388
389 qemu_mutex_unlock(&iscsilun->mutex);
390
391 timer_mod(iscsilun->event_timer,
392 qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + EVENT_INTERVAL);
393 }
394
395 static void
396 iscsi_process_read(void *arg)
397 {
398 IscsiLun *iscsilun = arg;
399 struct iscsi_context *iscsi = iscsilun->iscsi;
400
401 qemu_mutex_lock(&iscsilun->mutex);
402 iscsi_service(iscsi, POLLIN);
403 iscsi_set_events(iscsilun);
404 qemu_mutex_unlock(&iscsilun->mutex);
405 }
406
407 static void
408 iscsi_process_write(void *arg)
409 {
410 IscsiLun *iscsilun = arg;
411 struct iscsi_context *iscsi = iscsilun->iscsi;
412
413 qemu_mutex_lock(&iscsilun->mutex);
414 iscsi_service(iscsi, POLLOUT);
415 iscsi_set_events(iscsilun);
416 qemu_mutex_unlock(&iscsilun->mutex);
417 }
418
419 static int64_t sector_lun2qemu(int64_t sector, IscsiLun *iscsilun)
420 {
421 return sector * iscsilun->block_size / BDRV_SECTOR_SIZE;
422 }
423
424 static int64_t sector_qemu2lun(int64_t sector, IscsiLun *iscsilun)
425 {
426 return sector * BDRV_SECTOR_SIZE / iscsilun->block_size;
427 }
428
429 static bool is_byte_request_lun_aligned(int64_t offset, int count,
430 IscsiLun *iscsilun)
431 {
432 if (offset % iscsilun->block_size || count % iscsilun->block_size) {
433 error_report("iSCSI misaligned request: "
434 "iscsilun->block_size %u, offset %" PRIi64
435 ", count %d",
436 iscsilun->block_size, offset, count);
437 return false;
438 }
439 return true;
440 }
441
442 static bool is_sector_request_lun_aligned(int64_t sector_num, int nb_sectors,
443 IscsiLun *iscsilun)
444 {
445 assert(nb_sectors <= BDRV_REQUEST_MAX_SECTORS);
446 return is_byte_request_lun_aligned(sector_num << BDRV_SECTOR_BITS,
447 nb_sectors << BDRV_SECTOR_BITS,
448 iscsilun);
449 }
450
451 static void iscsi_allocmap_free(IscsiLun *iscsilun)
452 {
453 g_free(iscsilun->allocmap);
454 g_free(iscsilun->allocmap_valid);
455 iscsilun->allocmap = NULL;
456 iscsilun->allocmap_valid = NULL;
457 }
458
459
460 static int iscsi_allocmap_init(IscsiLun *iscsilun, int open_flags)
461 {
462 iscsi_allocmap_free(iscsilun);
463
464 assert(iscsilun->cluster_size);
465 iscsilun->allocmap_size =
466 DIV_ROUND_UP(iscsilun->num_blocks * iscsilun->block_size,
467 iscsilun->cluster_size);
468
469 iscsilun->allocmap = bitmap_try_new(iscsilun->allocmap_size);
470 if (!iscsilun->allocmap) {
471 return -ENOMEM;
472 }
473
474 if (open_flags & BDRV_O_NOCACHE) {
475 /* when cache.direct = on all allocmap entries are
476 * treated as invalid to force a relookup of the block
477 * status on every read request */
478 return 0;
479 }
480
481 iscsilun->allocmap_valid = bitmap_try_new(iscsilun->allocmap_size);
482 if (!iscsilun->allocmap_valid) {
483 /* if we are under memory pressure free the allocmap as well */
484 iscsi_allocmap_free(iscsilun);
485 return -ENOMEM;
486 }
487
488 return 0;
489 }
490
491 static void
492 iscsi_allocmap_update(IscsiLun *iscsilun, int64_t offset,
493 int64_t bytes, bool allocated, bool valid)
494 {
495 int64_t cl_num_expanded, nb_cls_expanded, cl_num_shrunk, nb_cls_shrunk;
496
497 if (iscsilun->allocmap == NULL) {
498 return;
499 }
500 /* expand to entirely contain all affected clusters */
501 assert(iscsilun->cluster_size);
502 cl_num_expanded = offset / iscsilun->cluster_size;
503 nb_cls_expanded = DIV_ROUND_UP(offset + bytes,
504 iscsilun->cluster_size) - cl_num_expanded;
505 /* shrink to touch only completely contained clusters */
506 cl_num_shrunk = DIV_ROUND_UP(offset, iscsilun->cluster_size);
507 nb_cls_shrunk = (offset + bytes) / iscsilun->cluster_size - cl_num_shrunk;
508 if (allocated) {
509 bitmap_set(iscsilun->allocmap, cl_num_expanded, nb_cls_expanded);
510 } else {
511 if (nb_cls_shrunk > 0) {
512 bitmap_clear(iscsilun->allocmap, cl_num_shrunk, nb_cls_shrunk);
513 }
514 }
515
516 if (iscsilun->allocmap_valid == NULL) {
517 return;
518 }
519 if (valid) {
520 if (nb_cls_shrunk > 0) {
521 bitmap_set(iscsilun->allocmap_valid, cl_num_shrunk, nb_cls_shrunk);
522 }
523 } else {
524 bitmap_clear(iscsilun->allocmap_valid, cl_num_expanded,
525 nb_cls_expanded);
526 }
527 }
528
529 static void
530 iscsi_allocmap_set_allocated(IscsiLun *iscsilun, int64_t offset,
531 int64_t bytes)
532 {
533 iscsi_allocmap_update(iscsilun, offset, bytes, true, true);
534 }
535
536 static void
537 iscsi_allocmap_set_unallocated(IscsiLun *iscsilun, int64_t offset,
538 int64_t bytes)
539 {
540 /* Note: if cache.direct=on the fifth argument to iscsi_allocmap_update
541 * is ignored, so this will in effect be an iscsi_allocmap_set_invalid.
542 */
543 iscsi_allocmap_update(iscsilun, offset, bytes, false, true);
544 }
545
546 static void iscsi_allocmap_set_invalid(IscsiLun *iscsilun, int64_t offset,
547 int64_t bytes)
548 {
549 iscsi_allocmap_update(iscsilun, offset, bytes, false, false);
550 }
551
552 static void iscsi_allocmap_invalidate(IscsiLun *iscsilun)
553 {
554 if (iscsilun->allocmap) {
555 bitmap_zero(iscsilun->allocmap, iscsilun->allocmap_size);
556 }
557 if (iscsilun->allocmap_valid) {
558 bitmap_zero(iscsilun->allocmap_valid, iscsilun->allocmap_size);
559 }
560 }
561
562 static inline bool
563 iscsi_allocmap_is_allocated(IscsiLun *iscsilun, int64_t offset,
564 int64_t bytes)
565 {
566 unsigned long size;
567 if (iscsilun->allocmap == NULL) {
568 return true;
569 }
570 assert(iscsilun->cluster_size);
571 size = DIV_ROUND_UP(offset + bytes, iscsilun->cluster_size);
572 return !(find_next_bit(iscsilun->allocmap, size,
573 offset / iscsilun->cluster_size) == size);
574 }
575
576 static inline bool iscsi_allocmap_is_valid(IscsiLun *iscsilun,
577 int64_t offset, int64_t bytes)
578 {
579 unsigned long size;
580 if (iscsilun->allocmap_valid == NULL) {
581 return false;
582 }
583 assert(iscsilun->cluster_size);
584 size = DIV_ROUND_UP(offset + bytes, iscsilun->cluster_size);
585 return (find_next_zero_bit(iscsilun->allocmap_valid, size,
586 offset / iscsilun->cluster_size) == size);
587 }
588
589 static void coroutine_fn iscsi_co_wait_for_task(IscsiTask *iTask,
590 IscsiLun *iscsilun)
591 {
592 while (!iTask->complete) {
593 iscsi_set_events(iscsilun);
594 qemu_mutex_unlock(&iscsilun->mutex);
595 qemu_coroutine_yield();
596 qemu_mutex_lock(&iscsilun->mutex);
597 }
598 }
599
600 static int coroutine_fn
601 iscsi_co_writev(BlockDriverState *bs, int64_t sector_num, int nb_sectors,
602 QEMUIOVector *iov, int flags)
603 {
604 IscsiLun *iscsilun = bs->opaque;
605 struct IscsiTask iTask;
606 uint64_t lba;
607 uint32_t num_sectors;
608 bool fua = flags & BDRV_REQ_FUA;
609 int r = 0;
610
611 if (fua) {
612 assert(iscsilun->dpofua);
613 }
614 if (!is_sector_request_lun_aligned(sector_num, nb_sectors, iscsilun)) {
615 return -EINVAL;
616 }
617
618 if (bs->bl.max_transfer) {
619 assert(nb_sectors << BDRV_SECTOR_BITS <= bs->bl.max_transfer);
620 }
621
622 lba = sector_qemu2lun(sector_num, iscsilun);
623 num_sectors = sector_qemu2lun(nb_sectors, iscsilun);
624 iscsi_co_init_iscsitask(iscsilun, &iTask);
625 qemu_mutex_lock(&iscsilun->mutex);
626 retry:
627 if (iscsilun->use_16_for_rw) {
628 #if LIBISCSI_API_VERSION >= (20160603)
629 iTask.task = iscsi_write16_iov_task(iscsilun->iscsi, iscsilun->lun, lba,
630 NULL, num_sectors * iscsilun->block_size,
631 iscsilun->block_size, 0, 0, fua, 0, 0,
632 iscsi_co_generic_cb, &iTask,
633 (struct scsi_iovec *)iov->iov, iov->niov);
634 } else {
635 iTask.task = iscsi_write10_iov_task(iscsilun->iscsi, iscsilun->lun, lba,
636 NULL, num_sectors * iscsilun->block_size,
637 iscsilun->block_size, 0, 0, fua, 0, 0,
638 iscsi_co_generic_cb, &iTask,
639 (struct scsi_iovec *)iov->iov, iov->niov);
640 }
641 #else
642 iTask.task = iscsi_write16_task(iscsilun->iscsi, iscsilun->lun, lba,
643 NULL, num_sectors * iscsilun->block_size,
644 iscsilun->block_size, 0, 0, fua, 0, 0,
645 iscsi_co_generic_cb, &iTask);
646 } else {
647 iTask.task = iscsi_write10_task(iscsilun->iscsi, iscsilun->lun, lba,
648 NULL, num_sectors * iscsilun->block_size,
649 iscsilun->block_size, 0, 0, fua, 0, 0,
650 iscsi_co_generic_cb, &iTask);
651 }
652 #endif
653 if (iTask.task == NULL) {
654 qemu_mutex_unlock(&iscsilun->mutex);
655 return -ENOMEM;
656 }
657 #if LIBISCSI_API_VERSION < (20160603)
658 scsi_task_set_iov_out(iTask.task, (struct scsi_iovec *) iov->iov,
659 iov->niov);
660 #endif
661 iscsi_co_wait_for_task(&iTask, iscsilun);
662
663 if (iTask.task != NULL) {
664 scsi_free_scsi_task(iTask.task);
665 iTask.task = NULL;
666 }
667
668 if (iTask.do_retry) {
669 iTask.complete = 0;
670 goto retry;
671 }
672
673 if (iTask.status != SCSI_STATUS_GOOD) {
674 iscsi_allocmap_set_invalid(iscsilun, sector_num * BDRV_SECTOR_SIZE,
675 nb_sectors * BDRV_SECTOR_SIZE);
676 error_report("iSCSI WRITE10/16 failed at lba %" PRIu64 ": %s", lba,
677 iTask.err_str);
678 r = iTask.err_code;
679 goto out_unlock;
680 }
681
682 iscsi_allocmap_set_allocated(iscsilun, sector_num * BDRV_SECTOR_SIZE,
683 nb_sectors * BDRV_SECTOR_SIZE);
684
685 out_unlock:
686 qemu_mutex_unlock(&iscsilun->mutex);
687 g_free(iTask.err_str);
688 return r;
689 }
690
691
692
693 static int coroutine_fn iscsi_co_block_status(BlockDriverState *bs,
694 bool want_zero, int64_t offset,
695 int64_t bytes, int64_t *pnum,
696 int64_t *map,
697 BlockDriverState **file)
698 {
699 IscsiLun *iscsilun = bs->opaque;
700 struct scsi_get_lba_status *lbas = NULL;
701 struct scsi_lba_status_descriptor *lbasd = NULL;
702 struct IscsiTask iTask;
703 uint64_t lba;
704 int ret;
705
706 iscsi_co_init_iscsitask(iscsilun, &iTask);
707
708 assert(QEMU_IS_ALIGNED(offset | bytes, iscsilun->block_size));
709
710 /* default to all sectors allocated */
711 ret = BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID;
712 if (map) {
713 *map = offset;
714 }
715 *pnum = bytes;
716
717 /* LUN does not support logical block provisioning */
718 if (!iscsilun->lbpme) {
719 goto out;
720 }
721
722 lba = offset / iscsilun->block_size;
723
724 qemu_mutex_lock(&iscsilun->mutex);
725 retry:
726 if (iscsi_get_lba_status_task(iscsilun->iscsi, iscsilun->lun,
727 lba, 8 + 16, iscsi_co_generic_cb,
728 &iTask) == NULL) {
729 ret = -ENOMEM;
730 goto out_unlock;
731 }
732 iscsi_co_wait_for_task(&iTask, iscsilun);
733
734 if (iTask.do_retry) {
735 if (iTask.task != NULL) {
736 scsi_free_scsi_task(iTask.task);
737 iTask.task = NULL;
738 }
739 iTask.complete = 0;
740 goto retry;
741 }
742
743 if (iTask.status != SCSI_STATUS_GOOD) {
744 /* in case the get_lba_status_callout fails (i.e.
745 * because the device is busy or the cmd is not
746 * supported) we pretend all blocks are allocated
747 * for backwards compatibility */
748 error_report("iSCSI GET_LBA_STATUS failed at lba %" PRIu64 ": %s",
749 lba, iTask.err_str);
750 goto out_unlock;
751 }
752
753 lbas = scsi_datain_unmarshall(iTask.task);
754 if (lbas == NULL) {
755 ret = -EIO;
756 goto out_unlock;
757 }
758
759 lbasd = &lbas->descriptors[0];
760
761 if (lba != lbasd->lba) {
762 ret = -EIO;
763 goto out_unlock;
764 }
765
766 *pnum = (int64_t) lbasd->num_blocks * iscsilun->block_size;
767
768 if (lbasd->provisioning == SCSI_PROVISIONING_TYPE_DEALLOCATED ||
769 lbasd->provisioning == SCSI_PROVISIONING_TYPE_ANCHORED) {
770 ret &= ~BDRV_BLOCK_DATA;
771 if (iscsilun->lbprz) {
772 ret |= BDRV_BLOCK_ZERO;
773 }
774 }
775
776 if (ret & BDRV_BLOCK_ZERO) {
777 iscsi_allocmap_set_unallocated(iscsilun, offset, *pnum);
778 } else {
779 iscsi_allocmap_set_allocated(iscsilun, offset, *pnum);
780 }
781
782 if (*pnum > bytes) {
783 *pnum = bytes;
784 }
785 out_unlock:
786 qemu_mutex_unlock(&iscsilun->mutex);
787 g_free(iTask.err_str);
788 out:
789 if (iTask.task != NULL) {
790 scsi_free_scsi_task(iTask.task);
791 }
792 if (ret > 0 && ret & BDRV_BLOCK_OFFSET_VALID && file) {
793 *file = bs;
794 }
795 return ret;
796 }
797
798 static int coroutine_fn iscsi_co_readv(BlockDriverState *bs,
799 int64_t sector_num, int nb_sectors,
800 QEMUIOVector *iov)
801 {
802 IscsiLun *iscsilun = bs->opaque;
803 struct IscsiTask iTask;
804 uint64_t lba;
805 uint32_t num_sectors;
806 int r = 0;
807
808 if (!is_sector_request_lun_aligned(sector_num, nb_sectors, iscsilun)) {
809 return -EINVAL;
810 }
811
812 if (bs->bl.max_transfer) {
813 assert(nb_sectors << BDRV_SECTOR_BITS <= bs->bl.max_transfer);
814 }
815
816 /* if cache.direct is off and we have a valid entry in our allocation map
817 * we can skip checking the block status and directly return zeroes if
818 * the request falls within an unallocated area */
819 if (iscsi_allocmap_is_valid(iscsilun, sector_num * BDRV_SECTOR_SIZE,
820 nb_sectors * BDRV_SECTOR_SIZE) &&
821 !iscsi_allocmap_is_allocated(iscsilun, sector_num * BDRV_SECTOR_SIZE,
822 nb_sectors * BDRV_SECTOR_SIZE)) {
823 qemu_iovec_memset(iov, 0, 0x00, iov->size);
824 return 0;
825 }
826
827 if (nb_sectors >= ISCSI_CHECKALLOC_THRES &&
828 !iscsi_allocmap_is_valid(iscsilun, sector_num * BDRV_SECTOR_SIZE,
829 nb_sectors * BDRV_SECTOR_SIZE) &&
830 !iscsi_allocmap_is_allocated(iscsilun, sector_num * BDRV_SECTOR_SIZE,
831 nb_sectors * BDRV_SECTOR_SIZE)) {
832 int64_t pnum;
833 /* check the block status from the beginning of the cluster
834 * containing the start sector */
835 int64_t head;
836 int ret;
837
838 assert(iscsilun->cluster_size);
839 head = (sector_num * BDRV_SECTOR_SIZE) % iscsilun->cluster_size;
840 ret = iscsi_co_block_status(bs, true,
841 sector_num * BDRV_SECTOR_SIZE - head,
842 BDRV_REQUEST_MAX_BYTES, &pnum, NULL, NULL);
843 if (ret < 0) {
844 return ret;
845 }
846 /* if the whole request falls into an unallocated area we can avoid
847 * reading and directly return zeroes instead */
848 if (ret & BDRV_BLOCK_ZERO &&
849 pnum >= nb_sectors * BDRV_SECTOR_SIZE + head) {
850 qemu_iovec_memset(iov, 0, 0x00, iov->size);
851 return 0;
852 }
853 }
854
855 lba = sector_qemu2lun(sector_num, iscsilun);
856 num_sectors = sector_qemu2lun(nb_sectors, iscsilun);
857
858 iscsi_co_init_iscsitask(iscsilun, &iTask);
859 qemu_mutex_lock(&iscsilun->mutex);
860 retry:
861 if (iscsilun->use_16_for_rw) {
862 #if LIBISCSI_API_VERSION >= (20160603)
863 iTask.task = iscsi_read16_iov_task(iscsilun->iscsi, iscsilun->lun, lba,
864 num_sectors * iscsilun->block_size,
865 iscsilun->block_size, 0, 0, 0, 0, 0,
866 iscsi_co_generic_cb, &iTask,
867 (struct scsi_iovec *)iov->iov, iov->niov);
868 } else {
869 iTask.task = iscsi_read10_iov_task(iscsilun->iscsi, iscsilun->lun, lba,
870 num_sectors * iscsilun->block_size,
871 iscsilun->block_size,
872 0, 0, 0, 0, 0,
873 iscsi_co_generic_cb, &iTask,
874 (struct scsi_iovec *)iov->iov, iov->niov);
875 }
876 #else
877 iTask.task = iscsi_read16_task(iscsilun->iscsi, iscsilun->lun, lba,
878 num_sectors * iscsilun->block_size,
879 iscsilun->block_size, 0, 0, 0, 0, 0,
880 iscsi_co_generic_cb, &iTask);
881 } else {
882 iTask.task = iscsi_read10_task(iscsilun->iscsi, iscsilun->lun, lba,
883 num_sectors * iscsilun->block_size,
884 iscsilun->block_size,
885 0, 0, 0, 0, 0,
886 iscsi_co_generic_cb, &iTask);
887 }
888 #endif
889 if (iTask.task == NULL) {
890 qemu_mutex_unlock(&iscsilun->mutex);
891 return -ENOMEM;
892 }
893 #if LIBISCSI_API_VERSION < (20160603)
894 scsi_task_set_iov_in(iTask.task, (struct scsi_iovec *) iov->iov, iov->niov);
895 #endif
896
897 iscsi_co_wait_for_task(&iTask, iscsilun);
898 if (iTask.task != NULL) {
899 scsi_free_scsi_task(iTask.task);
900 iTask.task = NULL;
901 }
902
903 if (iTask.do_retry) {
904 iTask.complete = 0;
905 goto retry;
906 }
907
908 if (iTask.status != SCSI_STATUS_GOOD) {
909 error_report("iSCSI READ10/16 failed at lba %" PRIu64 ": %s",
910 lba, iTask.err_str);
911 r = iTask.err_code;
912 }
913
914 qemu_mutex_unlock(&iscsilun->mutex);
915 g_free(iTask.err_str);
916 return r;
917 }
918
919 static int coroutine_fn iscsi_co_flush(BlockDriverState *bs)
920 {
921 IscsiLun *iscsilun = bs->opaque;
922 struct IscsiTask iTask;
923 int r = 0;
924
925 iscsi_co_init_iscsitask(iscsilun, &iTask);
926 qemu_mutex_lock(&iscsilun->mutex);
927 retry:
928 if (iscsi_synchronizecache10_task(iscsilun->iscsi, iscsilun->lun, 0, 0, 0,
929 0, iscsi_co_generic_cb, &iTask) == NULL) {
930 qemu_mutex_unlock(&iscsilun->mutex);
931 return -ENOMEM;
932 }
933
934 iscsi_co_wait_for_task(&iTask, iscsilun);
935
936 if (iTask.task != NULL) {
937 scsi_free_scsi_task(iTask.task);
938 iTask.task = NULL;
939 }
940
941 if (iTask.do_retry) {
942 iTask.complete = 0;
943 goto retry;
944 }
945
946 if (iTask.status != SCSI_STATUS_GOOD) {
947 error_report("iSCSI SYNCHRONIZECACHE10 failed: %s", iTask.err_str);
948 r = iTask.err_code;
949 }
950
951 qemu_mutex_unlock(&iscsilun->mutex);
952 g_free(iTask.err_str);
953 return r;
954 }
955
956 #ifdef __linux__
957 /* Called (via iscsi_service) with QemuMutex held. */
958 static void
959 iscsi_aio_ioctl_cb(struct iscsi_context *iscsi, int status,
960 void *command_data, void *opaque)
961 {
962 IscsiAIOCB *acb = opaque;
963
964 if (status == SCSI_STATUS_CANCELLED) {
965 if (!acb->bh) {
966 acb->status = -ECANCELED;
967 iscsi_schedule_bh(acb);
968 }
969 return;
970 }
971
972 acb->status = 0;
973 if (status < 0) {
974 error_report("Failed to ioctl(SG_IO) to iSCSI lun. %s",
975 iscsi_get_error(iscsi));
976 acb->status = -iscsi_translate_sense(&acb->task->sense);
977 }
978
979 acb->ioh->driver_status = 0;
980 acb->ioh->host_status = 0;
981 acb->ioh->resid = 0;
982 acb->ioh->status = status;
983
984 #define SG_ERR_DRIVER_SENSE 0x08
985
986 if (status == SCSI_STATUS_CHECK_CONDITION && acb->task->datain.size >= 2) {
987 int ss;
988
989 acb->ioh->driver_status |= SG_ERR_DRIVER_SENSE;
990
991 acb->ioh->sb_len_wr = acb->task->datain.size - 2;
992 ss = (acb->ioh->mx_sb_len >= acb->ioh->sb_len_wr) ?
993 acb->ioh->mx_sb_len : acb->ioh->sb_len_wr;
994 memcpy(acb->ioh->sbp, &acb->task->datain.data[2], ss);
995 }
996
997 iscsi_schedule_bh(acb);
998 }
999
1000 static void iscsi_ioctl_bh_completion(void *opaque)
1001 {
1002 IscsiAIOCB *acb = opaque;
1003
1004 qemu_bh_delete(acb->bh);
1005 acb->common.cb(acb->common.opaque, acb->ret);
1006 qemu_aio_unref(acb);
1007 }
1008
1009 static void iscsi_ioctl_handle_emulated(IscsiAIOCB *acb, int req, void *buf)
1010 {
1011 BlockDriverState *bs = acb->common.bs;
1012 IscsiLun *iscsilun = bs->opaque;
1013 int ret = 0;
1014
1015 switch (req) {
1016 case SG_GET_VERSION_NUM:
1017 *(int *)buf = 30000;
1018 break;
1019 case SG_GET_SCSI_ID:
1020 ((struct sg_scsi_id *)buf)->scsi_type = iscsilun->type;
1021 break;
1022 default:
1023 ret = -EINVAL;
1024 }
1025 assert(!acb->bh);
1026 acb->bh = aio_bh_new(bdrv_get_aio_context(bs),
1027 iscsi_ioctl_bh_completion, acb);
1028 acb->ret = ret;
1029 qemu_bh_schedule(acb->bh);
1030 }
1031
1032 static BlockAIOCB *iscsi_aio_ioctl(BlockDriverState *bs,
1033 unsigned long int req, void *buf,
1034 BlockCompletionFunc *cb, void *opaque)
1035 {
1036 IscsiLun *iscsilun = bs->opaque;
1037 struct iscsi_context *iscsi = iscsilun->iscsi;
1038 struct iscsi_data data;
1039 IscsiAIOCB *acb;
1040
1041 acb = qemu_aio_get(&iscsi_aiocb_info, bs, cb, opaque);
1042
1043 acb->iscsilun = iscsilun;
1044 acb->bh = NULL;
1045 acb->status = -EINPROGRESS;
1046 acb->ioh = buf;
1047 acb->cancelled = false;
1048
1049 if (req != SG_IO) {
1050 iscsi_ioctl_handle_emulated(acb, req, buf);
1051 return &acb->common;
1052 }
1053
1054 if (acb->ioh->cmd_len > SCSI_CDB_MAX_SIZE) {
1055 error_report("iSCSI: ioctl error CDB exceeds max size (%d > %d)",
1056 acb->ioh->cmd_len, SCSI_CDB_MAX_SIZE);
1057 qemu_aio_unref(acb);
1058 return NULL;
1059 }
1060
1061 acb->task = malloc(sizeof(struct scsi_task));
1062 if (acb->task == NULL) {
1063 error_report("iSCSI: Failed to allocate task for scsi command. %s",
1064 iscsi_get_error(iscsi));
1065 qemu_aio_unref(acb);
1066 return NULL;
1067 }
1068 memset(acb->task, 0, sizeof(struct scsi_task));
1069
1070 switch (acb->ioh->dxfer_direction) {
1071 case SG_DXFER_TO_DEV:
1072 acb->task->xfer_dir = SCSI_XFER_WRITE;
1073 break;
1074 case SG_DXFER_FROM_DEV:
1075 acb->task->xfer_dir = SCSI_XFER_READ;
1076 break;
1077 default:
1078 acb->task->xfer_dir = SCSI_XFER_NONE;
1079 break;
1080 }
1081
1082 acb->task->cdb_size = acb->ioh->cmd_len;
1083 memcpy(&acb->task->cdb[0], acb->ioh->cmdp, acb->ioh->cmd_len);
1084 acb->task->expxferlen = acb->ioh->dxfer_len;
1085
1086 data.size = 0;
1087 qemu_mutex_lock(&iscsilun->mutex);
1088 if (acb->task->xfer_dir == SCSI_XFER_WRITE) {
1089 if (acb->ioh->iovec_count == 0) {
1090 data.data = acb->ioh->dxferp;
1091 data.size = acb->ioh->dxfer_len;
1092 } else {
1093 scsi_task_set_iov_out(acb->task,
1094 (struct scsi_iovec *) acb->ioh->dxferp,
1095 acb->ioh->iovec_count);
1096 }
1097 }
1098
1099 if (iscsi_scsi_command_async(iscsi, iscsilun->lun, acb->task,
1100 iscsi_aio_ioctl_cb,
1101 (data.size > 0) ? &data : NULL,
1102 acb) != 0) {
1103 qemu_mutex_unlock(&iscsilun->mutex);
1104 scsi_free_scsi_task(acb->task);
1105 qemu_aio_unref(acb);
1106 return NULL;
1107 }
1108
1109 /* tell libiscsi to read straight into the buffer we got from ioctl */
1110 if (acb->task->xfer_dir == SCSI_XFER_READ) {
1111 if (acb->ioh->iovec_count == 0) {
1112 scsi_task_add_data_in_buffer(acb->task,
1113 acb->ioh->dxfer_len,
1114 acb->ioh->dxferp);
1115 } else {
1116 scsi_task_set_iov_in(acb->task,
1117 (struct scsi_iovec *) acb->ioh->dxferp,
1118 acb->ioh->iovec_count);
1119 }
1120 }
1121
1122 iscsi_set_events(iscsilun);
1123 qemu_mutex_unlock(&iscsilun->mutex);
1124
1125 return &acb->common;
1126 }
1127
1128 #endif
1129
1130 static int64_t
1131 iscsi_getlength(BlockDriverState *bs)
1132 {
1133 IscsiLun *iscsilun = bs->opaque;
1134 int64_t len;
1135
1136 len = iscsilun->num_blocks;
1137 len *= iscsilun->block_size;
1138
1139 return len;
1140 }
1141
1142 static int
1143 coroutine_fn iscsi_co_pdiscard(BlockDriverState *bs, int64_t offset, int bytes)
1144 {
1145 IscsiLun *iscsilun = bs->opaque;
1146 struct IscsiTask iTask;
1147 struct unmap_list list;
1148 int r = 0;
1149
1150 if (!is_byte_request_lun_aligned(offset, bytes, iscsilun)) {
1151 return -ENOTSUP;
1152 }
1153
1154 if (!iscsilun->lbp.lbpu) {
1155 /* UNMAP is not supported by the target */
1156 return 0;
1157 }
1158
1159 list.lba = offset / iscsilun->block_size;
1160 list.num = bytes / iscsilun->block_size;
1161
1162 iscsi_co_init_iscsitask(iscsilun, &iTask);
1163 qemu_mutex_lock(&iscsilun->mutex);
1164 retry:
1165 if (iscsi_unmap_task(iscsilun->iscsi, iscsilun->lun, 0, 0, &list, 1,
1166 iscsi_co_generic_cb, &iTask) == NULL) {
1167 r = -ENOMEM;
1168 goto out_unlock;
1169 }
1170
1171 iscsi_co_wait_for_task(&iTask, iscsilun);
1172
1173 if (iTask.task != NULL) {
1174 scsi_free_scsi_task(iTask.task);
1175 iTask.task = NULL;
1176 }
1177
1178 if (iTask.do_retry) {
1179 iTask.complete = 0;
1180 goto retry;
1181 }
1182
1183 iscsi_allocmap_set_invalid(iscsilun, offset, bytes);
1184
1185 if (iTask.status == SCSI_STATUS_CHECK_CONDITION) {
1186 /* the target might fail with a check condition if it
1187 is not happy with the alignment of the UNMAP request
1188 we silently fail in this case */
1189 goto out_unlock;
1190 }
1191
1192 if (iTask.status != SCSI_STATUS_GOOD) {
1193 error_report("iSCSI UNMAP failed at lba %" PRIu64 ": %s",
1194 list.lba, iTask.err_str);
1195 r = iTask.err_code;
1196 goto out_unlock;
1197 }
1198
1199 out_unlock:
1200 qemu_mutex_unlock(&iscsilun->mutex);
1201 g_free(iTask.err_str);
1202 return r;
1203 }
1204
1205 static int
1206 coroutine_fn iscsi_co_pwrite_zeroes(BlockDriverState *bs, int64_t offset,
1207 int bytes, BdrvRequestFlags flags)
1208 {
1209 IscsiLun *iscsilun = bs->opaque;
1210 struct IscsiTask iTask;
1211 uint64_t lba;
1212 uint32_t nb_blocks;
1213 bool use_16_for_ws = iscsilun->use_16_for_rw;
1214 int r = 0;
1215
1216 if (!is_byte_request_lun_aligned(offset, bytes, iscsilun)) {
1217 return -ENOTSUP;
1218 }
1219
1220 if (flags & BDRV_REQ_MAY_UNMAP) {
1221 if (!use_16_for_ws && !iscsilun->lbp.lbpws10) {
1222 /* WRITESAME10 with UNMAP is unsupported try WRITESAME16 */
1223 use_16_for_ws = true;
1224 }
1225 if (use_16_for_ws && !iscsilun->lbp.lbpws) {
1226 /* WRITESAME16 with UNMAP is not supported by the target,
1227 * fall back and try WRITESAME10/16 without UNMAP */
1228 flags &= ~BDRV_REQ_MAY_UNMAP;
1229 use_16_for_ws = iscsilun->use_16_for_rw;
1230 }
1231 }
1232
1233 if (!(flags & BDRV_REQ_MAY_UNMAP) && !iscsilun->has_write_same) {
1234 /* WRITESAME without UNMAP is not supported by the target */
1235 return -ENOTSUP;
1236 }
1237
1238 lba = offset / iscsilun->block_size;
1239 nb_blocks = bytes / iscsilun->block_size;
1240
1241 if (iscsilun->zeroblock == NULL) {
1242 iscsilun->zeroblock = g_try_malloc0(iscsilun->block_size);
1243 if (iscsilun->zeroblock == NULL) {
1244 return -ENOMEM;
1245 }
1246 }
1247
1248 qemu_mutex_lock(&iscsilun->mutex);
1249 iscsi_co_init_iscsitask(iscsilun, &iTask);
1250 retry:
1251 if (use_16_for_ws) {
1252 iTask.task = iscsi_writesame16_task(iscsilun->iscsi, iscsilun->lun, lba,
1253 iscsilun->zeroblock, iscsilun->block_size,
1254 nb_blocks, 0, !!(flags & BDRV_REQ_MAY_UNMAP),
1255 0, 0, iscsi_co_generic_cb, &iTask);
1256 } else {
1257 iTask.task = iscsi_writesame10_task(iscsilun->iscsi, iscsilun->lun, lba,
1258 iscsilun->zeroblock, iscsilun->block_size,
1259 nb_blocks, 0, !!(flags & BDRV_REQ_MAY_UNMAP),
1260 0, 0, iscsi_co_generic_cb, &iTask);
1261 }
1262 if (iTask.task == NULL) {
1263 qemu_mutex_unlock(&iscsilun->mutex);
1264 return -ENOMEM;
1265 }
1266
1267 iscsi_co_wait_for_task(&iTask, iscsilun);
1268
1269 if (iTask.status == SCSI_STATUS_CHECK_CONDITION &&
1270 iTask.task->sense.key == SCSI_SENSE_ILLEGAL_REQUEST &&
1271 (iTask.task->sense.ascq == SCSI_SENSE_ASCQ_INVALID_OPERATION_CODE ||
1272 iTask.task->sense.ascq == SCSI_SENSE_ASCQ_INVALID_FIELD_IN_CDB)) {
1273 /* WRITE SAME is not supported by the target */
1274 iscsilun->has_write_same = false;
1275 scsi_free_scsi_task(iTask.task);
1276 r = -ENOTSUP;
1277 goto out_unlock;
1278 }
1279
1280 if (iTask.task != NULL) {
1281 scsi_free_scsi_task(iTask.task);
1282 iTask.task = NULL;
1283 }
1284
1285 if (iTask.do_retry) {
1286 iTask.complete = 0;
1287 goto retry;
1288 }
1289
1290 if (iTask.status != SCSI_STATUS_GOOD) {
1291 iscsi_allocmap_set_invalid(iscsilun, offset, bytes);
1292 error_report("iSCSI WRITESAME10/16 failed at lba %" PRIu64 ": %s",
1293 lba, iTask.err_str);
1294 r = iTask.err_code;
1295 goto out_unlock;
1296 }
1297
1298 if (flags & BDRV_REQ_MAY_UNMAP) {
1299 iscsi_allocmap_set_invalid(iscsilun, offset, bytes);
1300 } else {
1301 iscsi_allocmap_set_allocated(iscsilun, offset, bytes);
1302 }
1303
1304 out_unlock:
1305 qemu_mutex_unlock(&iscsilun->mutex);
1306 g_free(iTask.err_str);
1307 return r;
1308 }
1309
1310 static void apply_chap(struct iscsi_context *iscsi, QemuOpts *opts,
1311 Error **errp)
1312 {
1313 const char *user = NULL;
1314 const char *password = NULL;
1315 const char *secretid;
1316 char *secret = NULL;
1317
1318 user = qemu_opt_get(opts, "user");
1319 if (!user) {
1320 return;
1321 }
1322
1323 secretid = qemu_opt_get(opts, "password-secret");
1324 password = qemu_opt_get(opts, "password");
1325 if (secretid && password) {
1326 error_setg(errp, "'password' and 'password-secret' properties are "
1327 "mutually exclusive");
1328 return;
1329 }
1330 if (secretid) {
1331 secret = qcrypto_secret_lookup_as_utf8(secretid, errp);
1332 if (!secret) {
1333 return;
1334 }
1335 password = secret;
1336 } else if (!password) {
1337 error_setg(errp, "CHAP username specified but no password was given");
1338 return;
1339 }
1340
1341 if (iscsi_set_initiator_username_pwd(iscsi, user, password)) {
1342 error_setg(errp, "Failed to set initiator username and password");
1343 }
1344
1345 g_free(secret);
1346 }
1347
1348 static void apply_header_digest(struct iscsi_context *iscsi, QemuOpts *opts,
1349 Error **errp)
1350 {
1351 const char *digest = NULL;
1352
1353 digest = qemu_opt_get(opts, "header-digest");
1354 if (!digest) {
1355 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE_CRC32C);
1356 } else if (!strcmp(digest, "crc32c")) {
1357 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_CRC32C);
1358 } else if (!strcmp(digest, "none")) {
1359 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE);
1360 } else if (!strcmp(digest, "crc32c-none")) {
1361 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_CRC32C_NONE);
1362 } else if (!strcmp(digest, "none-crc32c")) {
1363 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE_CRC32C);
1364 } else {
1365 error_setg(errp, "Invalid header-digest setting : %s", digest);
1366 }
1367 }
1368
1369 static char *get_initiator_name(QemuOpts *opts)
1370 {
1371 const char *name;
1372 char *iscsi_name;
1373 UuidInfo *uuid_info;
1374
1375 name = qemu_opt_get(opts, "initiator-name");
1376 if (name) {
1377 return g_strdup(name);
1378 }
1379
1380 uuid_info = qmp_query_uuid(NULL);
1381 if (strcmp(uuid_info->UUID, UUID_NONE) == 0) {
1382 name = qemu_get_vm_name();
1383 } else {
1384 name = uuid_info->UUID;
1385 }
1386 iscsi_name = g_strdup_printf("iqn.2008-11.org.linux-kvm%s%s",
1387 name ? ":" : "", name ? name : "");
1388 qapi_free_UuidInfo(uuid_info);
1389 return iscsi_name;
1390 }
1391
1392 static void iscsi_nop_timed_event(void *opaque)
1393 {
1394 IscsiLun *iscsilun = opaque;
1395
1396 qemu_mutex_lock(&iscsilun->mutex);
1397 if (iscsi_get_nops_in_flight(iscsilun->iscsi) >= MAX_NOP_FAILURES) {
1398 error_report("iSCSI: NOP timeout. Reconnecting...");
1399 iscsilun->request_timed_out = true;
1400 } else if (iscsi_nop_out_async(iscsilun->iscsi, NULL, NULL, 0, NULL) != 0) {
1401 error_report("iSCSI: failed to sent NOP-Out. Disabling NOP messages.");
1402 goto out;
1403 }
1404
1405 timer_mod(iscsilun->nop_timer, qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + NOP_INTERVAL);
1406 iscsi_set_events(iscsilun);
1407
1408 out:
1409 qemu_mutex_unlock(&iscsilun->mutex);
1410 }
1411
1412 static void iscsi_readcapacity_sync(IscsiLun *iscsilun, Error **errp)
1413 {
1414 struct scsi_task *task = NULL;
1415 struct scsi_readcapacity10 *rc10 = NULL;
1416 struct scsi_readcapacity16 *rc16 = NULL;
1417 int retries = ISCSI_CMD_RETRIES;
1418
1419 do {
1420 if (task != NULL) {
1421 scsi_free_scsi_task(task);
1422 task = NULL;
1423 }
1424
1425 switch (iscsilun->type) {
1426 case TYPE_DISK:
1427 task = iscsi_readcapacity16_sync(iscsilun->iscsi, iscsilun->lun);
1428 if (task != NULL && task->status == SCSI_STATUS_GOOD) {
1429 rc16 = scsi_datain_unmarshall(task);
1430 if (rc16 == NULL) {
1431 error_setg(errp, "iSCSI: Failed to unmarshall readcapacity16 data.");
1432 } else {
1433 iscsilun->block_size = rc16->block_length;
1434 iscsilun->num_blocks = rc16->returned_lba + 1;
1435 iscsilun->lbpme = !!rc16->lbpme;
1436 iscsilun->lbprz = !!rc16->lbprz;
1437 iscsilun->use_16_for_rw = (rc16->returned_lba > 0xffffffff);
1438 }
1439 break;
1440 }
1441 if (task != NULL && task->status == SCSI_STATUS_CHECK_CONDITION
1442 && task->sense.key == SCSI_SENSE_UNIT_ATTENTION) {
1443 break;
1444 }
1445 /* Fall through and try READ CAPACITY(10) instead. */
1446 case TYPE_ROM:
1447 task = iscsi_readcapacity10_sync(iscsilun->iscsi, iscsilun->lun, 0, 0);
1448 if (task != NULL && task->status == SCSI_STATUS_GOOD) {
1449 rc10 = scsi_datain_unmarshall(task);
1450 if (rc10 == NULL) {
1451 error_setg(errp, "iSCSI: Failed to unmarshall readcapacity10 data.");
1452 } else {
1453 iscsilun->block_size = rc10->block_size;
1454 if (rc10->lba == 0) {
1455 /* blank disk loaded */
1456 iscsilun->num_blocks = 0;
1457 } else {
1458 iscsilun->num_blocks = rc10->lba + 1;
1459 }
1460 }
1461 }
1462 break;
1463 default:
1464 return;
1465 }
1466 } while (task != NULL && task->status == SCSI_STATUS_CHECK_CONDITION
1467 && task->sense.key == SCSI_SENSE_UNIT_ATTENTION
1468 && retries-- > 0);
1469
1470 if (task == NULL || task->status != SCSI_STATUS_GOOD) {
1471 error_setg(errp, "iSCSI: failed to send readcapacity10/16 command");
1472 } else if (!iscsilun->block_size ||
1473 iscsilun->block_size % BDRV_SECTOR_SIZE) {
1474 error_setg(errp, "iSCSI: the target returned an invalid "
1475 "block size of %d.", iscsilun->block_size);
1476 }
1477 if (task) {
1478 scsi_free_scsi_task(task);
1479 }
1480 }
1481
1482 static struct scsi_task *iscsi_do_inquiry(struct iscsi_context *iscsi, int lun,
1483 int evpd, int pc, void **inq, Error **errp)
1484 {
1485 int full_size;
1486 struct scsi_task *task = NULL;
1487 task = iscsi_inquiry_sync(iscsi, lun, evpd, pc, 64);
1488 if (task == NULL || task->status != SCSI_STATUS_GOOD) {
1489 goto fail;
1490 }
1491 full_size = scsi_datain_getfullsize(task);
1492 if (full_size > task->datain.size) {
1493 scsi_free_scsi_task(task);
1494
1495 /* we need more data for the full list */
1496 task = iscsi_inquiry_sync(iscsi, lun, evpd, pc, full_size);
1497 if (task == NULL || task->status != SCSI_STATUS_GOOD) {
1498 goto fail;
1499 }
1500 }
1501
1502 *inq = scsi_datain_unmarshall(task);
1503 if (*inq == NULL) {
1504 error_setg(errp, "iSCSI: failed to unmarshall inquiry datain blob");
1505 goto fail_with_err;
1506 }
1507
1508 return task;
1509
1510 fail:
1511 error_setg(errp, "iSCSI: Inquiry command failed : %s",
1512 iscsi_get_error(iscsi));
1513 fail_with_err:
1514 if (task != NULL) {
1515 scsi_free_scsi_task(task);
1516 }
1517 return NULL;
1518 }
1519
1520 static void iscsi_detach_aio_context(BlockDriverState *bs)
1521 {
1522 IscsiLun *iscsilun = bs->opaque;
1523
1524 aio_set_fd_handler(iscsilun->aio_context, iscsi_get_fd(iscsilun->iscsi),
1525 false, NULL, NULL, NULL, NULL);
1526 iscsilun->events = 0;
1527
1528 if (iscsilun->nop_timer) {
1529 timer_del(iscsilun->nop_timer);
1530 timer_free(iscsilun->nop_timer);
1531 iscsilun->nop_timer = NULL;
1532 }
1533 if (iscsilun->event_timer) {
1534 timer_del(iscsilun->event_timer);
1535 timer_free(iscsilun->event_timer);
1536 iscsilun->event_timer = NULL;
1537 }
1538 }
1539
1540 static void iscsi_attach_aio_context(BlockDriverState *bs,
1541 AioContext *new_context)
1542 {
1543 IscsiLun *iscsilun = bs->opaque;
1544
1545 iscsilun->aio_context = new_context;
1546 iscsi_set_events(iscsilun);
1547
1548 /* Set up a timer for sending out iSCSI NOPs */
1549 iscsilun->nop_timer = aio_timer_new(iscsilun->aio_context,
1550 QEMU_CLOCK_REALTIME, SCALE_MS,
1551 iscsi_nop_timed_event, iscsilun);
1552 timer_mod(iscsilun->nop_timer,
1553 qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + NOP_INTERVAL);
1554
1555 /* Set up a timer for periodic calls to iscsi_set_events and to
1556 * scan for command timeout */
1557 iscsilun->event_timer = aio_timer_new(iscsilun->aio_context,
1558 QEMU_CLOCK_REALTIME, SCALE_MS,
1559 iscsi_timed_check_events, iscsilun);
1560 timer_mod(iscsilun->event_timer,
1561 qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + EVENT_INTERVAL);
1562 }
1563
1564 static void iscsi_modesense_sync(IscsiLun *iscsilun)
1565 {
1566 struct scsi_task *task;
1567 struct scsi_mode_sense *ms = NULL;
1568 iscsilun->write_protected = false;
1569 iscsilun->dpofua = false;
1570
1571 task = iscsi_modesense6_sync(iscsilun->iscsi, iscsilun->lun,
1572 1, SCSI_MODESENSE_PC_CURRENT,
1573 0x3F, 0, 255);
1574 if (task == NULL) {
1575 error_report("iSCSI: Failed to send MODE_SENSE(6) command: %s",
1576 iscsi_get_error(iscsilun->iscsi));
1577 goto out;
1578 }
1579
1580 if (task->status != SCSI_STATUS_GOOD) {
1581 error_report("iSCSI: Failed MODE_SENSE(6), LUN assumed writable");
1582 goto out;
1583 }
1584 ms = scsi_datain_unmarshall(task);
1585 if (!ms) {
1586 error_report("iSCSI: Failed to unmarshall MODE_SENSE(6) data: %s",
1587 iscsi_get_error(iscsilun->iscsi));
1588 goto out;
1589 }
1590 iscsilun->write_protected = ms->device_specific_parameter & 0x80;
1591 iscsilun->dpofua = ms->device_specific_parameter & 0x10;
1592
1593 out:
1594 if (task) {
1595 scsi_free_scsi_task(task);
1596 }
1597 }
1598
1599 static void iscsi_parse_iscsi_option(const char *target, QDict *options)
1600 {
1601 QemuOptsList *list;
1602 QemuOpts *opts;
1603 const char *user, *password, *password_secret, *initiator_name,
1604 *header_digest, *timeout;
1605
1606 list = qemu_find_opts("iscsi");
1607 if (!list) {
1608 return;
1609 }
1610
1611 opts = qemu_opts_find(list, target);
1612 if (opts == NULL) {
1613 opts = QTAILQ_FIRST(&list->head);
1614 if (!opts) {
1615 return;
1616 }
1617 }
1618
1619 user = qemu_opt_get(opts, "user");
1620 if (user) {
1621 qdict_set_default_str(options, "user", user);
1622 }
1623
1624 password = qemu_opt_get(opts, "password");
1625 if (password) {
1626 qdict_set_default_str(options, "password", password);
1627 }
1628
1629 password_secret = qemu_opt_get(opts, "password-secret");
1630 if (password_secret) {
1631 qdict_set_default_str(options, "password-secret", password_secret);
1632 }
1633
1634 initiator_name = qemu_opt_get(opts, "initiator-name");
1635 if (initiator_name) {
1636 qdict_set_default_str(options, "initiator-name", initiator_name);
1637 }
1638
1639 header_digest = qemu_opt_get(opts, "header-digest");
1640 if (header_digest) {
1641 /* -iscsi takes upper case values, but QAPI only supports lower case
1642 * enum constant names, so we have to convert here. */
1643 char *qapi_value = g_ascii_strdown(header_digest, -1);
1644 qdict_set_default_str(options, "header-digest", qapi_value);
1645 g_free(qapi_value);
1646 }
1647
1648 timeout = qemu_opt_get(opts, "timeout");
1649 if (timeout) {
1650 qdict_set_default_str(options, "timeout", timeout);
1651 }
1652 }
1653
1654 /*
1655 * We support iscsi url's on the form
1656 * iscsi://[<username>%<password>@]<host>[:<port>]/<targetname>/<lun>
1657 */
1658 static void iscsi_parse_filename(const char *filename, QDict *options,
1659 Error **errp)
1660 {
1661 struct iscsi_url *iscsi_url;
1662 const char *transport_name;
1663 char *lun_str;
1664
1665 iscsi_url = iscsi_parse_full_url(NULL, filename);
1666 if (iscsi_url == NULL) {
1667 error_setg(errp, "Failed to parse URL : %s", filename);
1668 return;
1669 }
1670
1671 #if LIBISCSI_API_VERSION >= (20160603)
1672 switch (iscsi_url->transport) {
1673 case TCP_TRANSPORT:
1674 transport_name = "tcp";
1675 break;
1676 case ISER_TRANSPORT:
1677 transport_name = "iser";
1678 break;
1679 default:
1680 error_setg(errp, "Unknown transport type (%d)",
1681 iscsi_url->transport);
1682 return;
1683 }
1684 #else
1685 transport_name = "tcp";
1686 #endif
1687
1688 qdict_set_default_str(options, "transport", transport_name);
1689 qdict_set_default_str(options, "portal", iscsi_url->portal);
1690 qdict_set_default_str(options, "target", iscsi_url->target);
1691
1692 lun_str = g_strdup_printf("%d", iscsi_url->lun);
1693 qdict_set_default_str(options, "lun", lun_str);
1694 g_free(lun_str);
1695
1696 /* User/password from -iscsi take precedence over those from the URL */
1697 iscsi_parse_iscsi_option(iscsi_url->target, options);
1698
1699 if (iscsi_url->user[0] != '\0') {
1700 qdict_set_default_str(options, "user", iscsi_url->user);
1701 qdict_set_default_str(options, "password", iscsi_url->passwd);
1702 }
1703
1704 iscsi_destroy_url(iscsi_url);
1705 }
1706
1707 static QemuOptsList runtime_opts = {
1708 .name = "iscsi",
1709 .head = QTAILQ_HEAD_INITIALIZER(runtime_opts.head),
1710 .desc = {
1711 {
1712 .name = "transport",
1713 .type = QEMU_OPT_STRING,
1714 },
1715 {
1716 .name = "portal",
1717 .type = QEMU_OPT_STRING,
1718 },
1719 {
1720 .name = "target",
1721 .type = QEMU_OPT_STRING,
1722 },
1723 {
1724 .name = "user",
1725 .type = QEMU_OPT_STRING,
1726 },
1727 {
1728 .name = "password",
1729 .type = QEMU_OPT_STRING,
1730 },
1731 {
1732 .name = "password-secret",
1733 .type = QEMU_OPT_STRING,
1734 },
1735 {
1736 .name = "lun",
1737 .type = QEMU_OPT_NUMBER,
1738 },
1739 {
1740 .name = "initiator-name",
1741 .type = QEMU_OPT_STRING,
1742 },
1743 {
1744 .name = "header-digest",
1745 .type = QEMU_OPT_STRING,
1746 },
1747 {
1748 .name = "timeout",
1749 .type = QEMU_OPT_NUMBER,
1750 },
1751 { /* end of list */ }
1752 },
1753 };
1754
1755 static void iscsi_save_designator(IscsiLun *lun,
1756 struct scsi_inquiry_device_identification *inq_di)
1757 {
1758 struct scsi_inquiry_device_designator *desig, *copy = NULL;
1759
1760 for (desig = inq_di->designators; desig; desig = desig->next) {
1761 if (desig->association ||
1762 desig->designator_type > SCSI_DESIGNATOR_TYPE_NAA) {
1763 continue;
1764 }
1765 /* NAA works better than T10 vendor ID based designator. */
1766 if (!copy || copy->designator_type < desig->designator_type) {
1767 copy = desig;
1768 }
1769 }
1770 if (copy) {
1771 lun->dd = g_new(struct scsi_inquiry_device_designator, 1);
1772 *lun->dd = *copy;
1773 lun->dd->next = NULL;
1774 lun->dd->designator = g_malloc(copy->designator_length);
1775 memcpy(lun->dd->designator, copy->designator, copy->designator_length);
1776 }
1777 }
1778
1779 static int iscsi_open(BlockDriverState *bs, QDict *options, int flags,
1780 Error **errp)
1781 {
1782 IscsiLun *iscsilun = bs->opaque;
1783 struct iscsi_context *iscsi = NULL;
1784 struct scsi_task *task = NULL;
1785 struct scsi_inquiry_standard *inq = NULL;
1786 struct scsi_inquiry_supported_pages *inq_vpd;
1787 char *initiator_name = NULL;
1788 QemuOpts *opts;
1789 Error *local_err = NULL;
1790 const char *transport_name, *portal, *target;
1791 #if LIBISCSI_API_VERSION >= (20160603)
1792 enum iscsi_transport_type transport;
1793 #endif
1794 int i, ret = 0, timeout = 0, lun;
1795
1796 opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort);
1797 qemu_opts_absorb_qdict(opts, options, &local_err);
1798 if (local_err) {
1799 error_propagate(errp, local_err);
1800 ret = -EINVAL;
1801 goto out;
1802 }
1803
1804 transport_name = qemu_opt_get(opts, "transport");
1805 portal = qemu_opt_get(opts, "portal");
1806 target = qemu_opt_get(opts, "target");
1807 lun = qemu_opt_get_number(opts, "lun", 0);
1808
1809 if (!transport_name || !portal || !target) {
1810 error_setg(errp, "Need all of transport, portal and target options");
1811 ret = -EINVAL;
1812 goto out;
1813 }
1814
1815 if (!strcmp(transport_name, "tcp")) {
1816 #if LIBISCSI_API_VERSION >= (20160603)
1817 transport = TCP_TRANSPORT;
1818 } else if (!strcmp(transport_name, "iser")) {
1819 transport = ISER_TRANSPORT;
1820 #else
1821 /* TCP is what older libiscsi versions always use */
1822 #endif
1823 } else {
1824 error_setg(errp, "Unknown transport: %s", transport_name);
1825 ret = -EINVAL;
1826 goto out;
1827 }
1828
1829 memset(iscsilun, 0, sizeof(IscsiLun));
1830
1831 initiator_name = get_initiator_name(opts);
1832
1833 iscsi = iscsi_create_context(initiator_name);
1834 if (iscsi == NULL) {
1835 error_setg(errp, "iSCSI: Failed to create iSCSI context.");
1836 ret = -ENOMEM;
1837 goto out;
1838 }
1839 #if LIBISCSI_API_VERSION >= (20160603)
1840 if (iscsi_init_transport(iscsi, transport)) {
1841 error_setg(errp, ("Error initializing transport."));
1842 ret = -EINVAL;
1843 goto out;
1844 }
1845 #endif
1846 if (iscsi_set_targetname(iscsi, target)) {
1847 error_setg(errp, "iSCSI: Failed to set target name.");
1848 ret = -EINVAL;
1849 goto out;
1850 }
1851
1852 /* check if we got CHAP username/password via the options */
1853 apply_chap(iscsi, opts, &local_err);
1854 if (local_err != NULL) {
1855 error_propagate(errp, local_err);
1856 ret = -EINVAL;
1857 goto out;
1858 }
1859
1860 if (iscsi_set_session_type(iscsi, ISCSI_SESSION_NORMAL) != 0) {
1861 error_setg(errp, "iSCSI: Failed to set session type to normal.");
1862 ret = -EINVAL;
1863 goto out;
1864 }
1865
1866 /* check if we got HEADER_DIGEST via the options */
1867 apply_header_digest(iscsi, opts, &local_err);
1868 if (local_err != NULL) {
1869 error_propagate(errp, local_err);
1870 ret = -EINVAL;
1871 goto out;
1872 }
1873
1874 /* timeout handling is broken in libiscsi before 1.15.0 */
1875 timeout = qemu_opt_get_number(opts, "timeout", 0);
1876 #if LIBISCSI_API_VERSION >= 20150621
1877 iscsi_set_timeout(iscsi, timeout);
1878 #else
1879 if (timeout) {
1880 warn_report("iSCSI: ignoring timeout value for libiscsi <1.15.0");
1881 }
1882 #endif
1883
1884 if (iscsi_full_connect_sync(iscsi, portal, lun) != 0) {
1885 error_setg(errp, "iSCSI: Failed to connect to LUN : %s",
1886 iscsi_get_error(iscsi));
1887 ret = -EINVAL;
1888 goto out;
1889 }
1890
1891 iscsilun->iscsi = iscsi;
1892 iscsilun->aio_context = bdrv_get_aio_context(bs);
1893 iscsilun->lun = lun;
1894 iscsilun->has_write_same = true;
1895
1896 task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 0, 0,
1897 (void **) &inq, errp);
1898 if (task == NULL) {
1899 ret = -EINVAL;
1900 goto out;
1901 }
1902 iscsilun->type = inq->periperal_device_type;
1903 scsi_free_scsi_task(task);
1904 task = NULL;
1905
1906 iscsi_modesense_sync(iscsilun);
1907 if (iscsilun->dpofua) {
1908 bs->supported_write_flags = BDRV_REQ_FUA;
1909 }
1910
1911 /* Check the write protect flag of the LUN if we want to write */
1912 if (iscsilun->type == TYPE_DISK && (flags & BDRV_O_RDWR) &&
1913 iscsilun->write_protected) {
1914 ret = bdrv_apply_auto_read_only(bs, "LUN is write protected", errp);
1915 if (ret < 0) {
1916 goto out;
1917 }
1918 flags &= ~BDRV_O_RDWR;
1919 }
1920
1921 iscsi_readcapacity_sync(iscsilun, &local_err);
1922 if (local_err != NULL) {
1923 error_propagate(errp, local_err);
1924 ret = -EINVAL;
1925 goto out;
1926 }
1927 bs->total_sectors = sector_lun2qemu(iscsilun->num_blocks, iscsilun);
1928
1929 /* We don't have any emulation for devices other than disks and CD-ROMs, so
1930 * this must be sg ioctl compatible. We force it to be sg, otherwise qemu
1931 * will try to read from the device to guess the image format.
1932 */
1933 if (iscsilun->type != TYPE_DISK && iscsilun->type != TYPE_ROM) {
1934 bs->sg = true;
1935 }
1936
1937 task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1,
1938 SCSI_INQUIRY_PAGECODE_SUPPORTED_VPD_PAGES,
1939 (void **) &inq_vpd, errp);
1940 if (task == NULL) {
1941 ret = -EINVAL;
1942 goto out;
1943 }
1944 for (i = 0; i < inq_vpd->num_pages; i++) {
1945 struct scsi_task *inq_task;
1946 struct scsi_inquiry_logical_block_provisioning *inq_lbp;
1947 struct scsi_inquiry_block_limits *inq_bl;
1948 struct scsi_inquiry_device_identification *inq_di;
1949 switch (inq_vpd->pages[i]) {
1950 case SCSI_INQUIRY_PAGECODE_LOGICAL_BLOCK_PROVISIONING:
1951 inq_task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1,
1952 SCSI_INQUIRY_PAGECODE_LOGICAL_BLOCK_PROVISIONING,
1953 (void **) &inq_lbp, errp);
1954 if (inq_task == NULL) {
1955 ret = -EINVAL;
1956 goto out;
1957 }
1958 memcpy(&iscsilun->lbp, inq_lbp,
1959 sizeof(struct scsi_inquiry_logical_block_provisioning));
1960 scsi_free_scsi_task(inq_task);
1961 break;
1962 case SCSI_INQUIRY_PAGECODE_BLOCK_LIMITS:
1963 inq_task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1,
1964 SCSI_INQUIRY_PAGECODE_BLOCK_LIMITS,
1965 (void **) &inq_bl, errp);
1966 if (inq_task == NULL) {
1967 ret = -EINVAL;
1968 goto out;
1969 }
1970 memcpy(&iscsilun->bl, inq_bl,
1971 sizeof(struct scsi_inquiry_block_limits));
1972 scsi_free_scsi_task(inq_task);
1973 break;
1974 case SCSI_INQUIRY_PAGECODE_DEVICE_IDENTIFICATION:
1975 inq_task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1,
1976 SCSI_INQUIRY_PAGECODE_DEVICE_IDENTIFICATION,
1977 (void **) &inq_di, errp);
1978 if (inq_task == NULL) {
1979 ret = -EINVAL;
1980 goto out;
1981 }
1982 iscsi_save_designator(iscsilun, inq_di);
1983 scsi_free_scsi_task(inq_task);
1984 break;
1985 default:
1986 break;
1987 }
1988 }
1989 scsi_free_scsi_task(task);
1990 task = NULL;
1991
1992 qemu_mutex_init(&iscsilun->mutex);
1993 iscsi_attach_aio_context(bs, iscsilun->aio_context);
1994
1995 /* Guess the internal cluster (page) size of the iscsi target by the means
1996 * of opt_unmap_gran. Transfer the unmap granularity only if it has a
1997 * reasonable size */
1998 if (iscsilun->bl.opt_unmap_gran * iscsilun->block_size >= 4 * 1024 &&
1999 iscsilun->bl.opt_unmap_gran * iscsilun->block_size <= 16 * 1024 * 1024) {
2000 iscsilun->cluster_size = iscsilun->bl.opt_unmap_gran *
2001 iscsilun->block_size;
2002 if (iscsilun->lbprz) {
2003 ret = iscsi_allocmap_init(iscsilun, bs->open_flags);
2004 }
2005 }
2006
2007 if (iscsilun->lbprz && iscsilun->lbp.lbpws) {
2008 bs->supported_zero_flags = BDRV_REQ_MAY_UNMAP;
2009 }
2010
2011 out:
2012 qemu_opts_del(opts);
2013 g_free(initiator_name);
2014 if (task != NULL) {
2015 scsi_free_scsi_task(task);
2016 }
2017
2018 if (ret) {
2019 if (iscsi != NULL) {
2020 if (iscsi_is_logged_in(iscsi)) {
2021 iscsi_logout_sync(iscsi);
2022 }
2023 iscsi_destroy_context(iscsi);
2024 }
2025 memset(iscsilun, 0, sizeof(IscsiLun));
2026 }
2027
2028 return ret;
2029 }
2030
2031 static void iscsi_close(BlockDriverState *bs)
2032 {
2033 IscsiLun *iscsilun = bs->opaque;
2034 struct iscsi_context *iscsi = iscsilun->iscsi;
2035
2036 iscsi_detach_aio_context(bs);
2037 if (iscsi_is_logged_in(iscsi)) {
2038 iscsi_logout_sync(iscsi);
2039 }
2040 iscsi_destroy_context(iscsi);
2041 if (iscsilun->dd) {
2042 g_free(iscsilun->dd->designator);
2043 g_free(iscsilun->dd);
2044 }
2045 g_free(iscsilun->zeroblock);
2046 iscsi_allocmap_free(iscsilun);
2047 qemu_mutex_destroy(&iscsilun->mutex);
2048 memset(iscsilun, 0, sizeof(IscsiLun));
2049 }
2050
2051 static void iscsi_refresh_limits(BlockDriverState *bs, Error **errp)
2052 {
2053 /* We don't actually refresh here, but just return data queried in
2054 * iscsi_open(): iscsi targets don't change their limits. */
2055
2056 IscsiLun *iscsilun = bs->opaque;
2057 uint64_t max_xfer_len = iscsilun->use_16_for_rw ? 0xffffffff : 0xffff;
2058 unsigned int block_size = MAX(BDRV_SECTOR_SIZE, iscsilun->block_size);
2059
2060 assert(iscsilun->block_size >= BDRV_SECTOR_SIZE || bs->sg);
2061
2062 bs->bl.request_alignment = block_size;
2063
2064 if (iscsilun->bl.max_xfer_len) {
2065 max_xfer_len = MIN(max_xfer_len, iscsilun->bl.max_xfer_len);
2066 }
2067
2068 if (max_xfer_len * block_size < INT_MAX) {
2069 bs->bl.max_transfer = max_xfer_len * iscsilun->block_size;
2070 }
2071
2072 if (iscsilun->lbp.lbpu) {
2073 if (iscsilun->bl.max_unmap < 0xffffffff / block_size) {
2074 bs->bl.max_pdiscard =
2075 iscsilun->bl.max_unmap * iscsilun->block_size;
2076 }
2077 bs->bl.pdiscard_alignment =
2078 iscsilun->bl.opt_unmap_gran * iscsilun->block_size;
2079 } else {
2080 bs->bl.pdiscard_alignment = iscsilun->block_size;
2081 }
2082
2083 if (iscsilun->bl.max_ws_len < 0xffffffff / block_size) {
2084 bs->bl.max_pwrite_zeroes =
2085 iscsilun->bl.max_ws_len * iscsilun->block_size;
2086 }
2087 if (iscsilun->lbp.lbpws) {
2088 bs->bl.pwrite_zeroes_alignment =
2089 iscsilun->bl.opt_unmap_gran * iscsilun->block_size;
2090 } else {
2091 bs->bl.pwrite_zeroes_alignment = iscsilun->block_size;
2092 }
2093 if (iscsilun->bl.opt_xfer_len &&
2094 iscsilun->bl.opt_xfer_len < INT_MAX / block_size) {
2095 bs->bl.opt_transfer = pow2floor(iscsilun->bl.opt_xfer_len *
2096 iscsilun->block_size);
2097 }
2098 }
2099
2100 /* Note that this will not re-establish a connection with an iSCSI target - it
2101 * is effectively a NOP. */
2102 static int iscsi_reopen_prepare(BDRVReopenState *state,
2103 BlockReopenQueue *queue, Error **errp)
2104 {
2105 IscsiLun *iscsilun = state->bs->opaque;
2106
2107 if (state->flags & BDRV_O_RDWR && iscsilun->write_protected) {
2108 error_setg(errp, "Cannot open a write protected LUN as read-write");
2109 return -EACCES;
2110 }
2111 return 0;
2112 }
2113
2114 static void iscsi_reopen_commit(BDRVReopenState *reopen_state)
2115 {
2116 IscsiLun *iscsilun = reopen_state->bs->opaque;
2117
2118 /* the cache.direct status might have changed */
2119 if (iscsilun->allocmap != NULL) {
2120 iscsi_allocmap_init(iscsilun, reopen_state->flags);
2121 }
2122 }
2123
2124 static int coroutine_fn iscsi_co_truncate(BlockDriverState *bs, int64_t offset,
2125 PreallocMode prealloc, Error **errp)
2126 {
2127 IscsiLun *iscsilun = bs->opaque;
2128 Error *local_err = NULL;
2129
2130 if (prealloc != PREALLOC_MODE_OFF) {
2131 error_setg(errp, "Unsupported preallocation mode '%s'",
2132 PreallocMode_str(prealloc));
2133 return -ENOTSUP;
2134 }
2135
2136 if (iscsilun->type != TYPE_DISK) {
2137 error_setg(errp, "Cannot resize non-disk iSCSI devices");
2138 return -ENOTSUP;
2139 }
2140
2141 iscsi_readcapacity_sync(iscsilun, &local_err);
2142 if (local_err != NULL) {
2143 error_propagate(errp, local_err);
2144 return -EIO;
2145 }
2146
2147 if (offset > iscsi_getlength(bs)) {
2148 error_setg(errp, "Cannot grow iSCSI devices");
2149 return -EINVAL;
2150 }
2151
2152 if (iscsilun->allocmap != NULL) {
2153 iscsi_allocmap_init(iscsilun, bs->open_flags);
2154 }
2155
2156 return 0;
2157 }
2158
2159 static int coroutine_fn iscsi_co_create_opts(const char *filename, QemuOpts *opts,
2160 Error **errp)
2161 {
2162 int ret = 0;
2163 int64_t total_size = 0;
2164 BlockDriverState *bs;
2165 IscsiLun *iscsilun = NULL;
2166 QDict *bs_options;
2167 Error *local_err = NULL;
2168
2169 bs = bdrv_new();
2170
2171 /* Read out options */
2172 total_size = DIV_ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0),
2173 BDRV_SECTOR_SIZE);
2174 bs->opaque = g_new0(struct IscsiLun, 1);
2175 iscsilun = bs->opaque;
2176
2177 bs_options = qdict_new();
2178 iscsi_parse_filename(filename, bs_options, &local_err);
2179 if (local_err) {
2180 error_propagate(errp, local_err);
2181 ret = -EINVAL;
2182 } else {
2183 ret = iscsi_open(bs, bs_options, 0, NULL);
2184 }
2185 qobject_unref(bs_options);
2186
2187 if (ret != 0) {
2188 goto out;
2189 }
2190 iscsi_detach_aio_context(bs);
2191 if (iscsilun->type != TYPE_DISK) {
2192 ret = -ENODEV;
2193 goto out;
2194 }
2195 if (bs->total_sectors < total_size) {
2196 ret = -ENOSPC;
2197 goto out;
2198 }
2199
2200 ret = 0;
2201 out:
2202 if (iscsilun->iscsi != NULL) {
2203 iscsi_destroy_context(iscsilun->iscsi);
2204 }
2205 g_free(bs->opaque);
2206 bs->opaque = NULL;
2207 bdrv_unref(bs);
2208 return ret;
2209 }
2210
2211 static int iscsi_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
2212 {
2213 IscsiLun *iscsilun = bs->opaque;
2214 bdi->unallocated_blocks_are_zero = iscsilun->lbprz;
2215 bdi->cluster_size = iscsilun->cluster_size;
2216 return 0;
2217 }
2218
2219 static void coroutine_fn iscsi_co_invalidate_cache(BlockDriverState *bs,
2220 Error **errp)
2221 {
2222 IscsiLun *iscsilun = bs->opaque;
2223 iscsi_allocmap_invalidate(iscsilun);
2224 }
2225
2226 static int coroutine_fn iscsi_co_copy_range_from(BlockDriverState *bs,
2227 BdrvChild *src,
2228 uint64_t src_offset,
2229 BdrvChild *dst,
2230 uint64_t dst_offset,
2231 uint64_t bytes,
2232 BdrvRequestFlags read_flags,
2233 BdrvRequestFlags write_flags)
2234 {
2235 return bdrv_co_copy_range_to(src, src_offset, dst, dst_offset, bytes,
2236 read_flags, write_flags);
2237 }
2238
2239 static struct scsi_task *iscsi_xcopy_task(int param_len)
2240 {
2241 struct scsi_task *task;
2242
2243 task = g_new0(struct scsi_task, 1);
2244
2245 task->cdb[0] = EXTENDED_COPY;
2246 task->cdb[10] = (param_len >> 24) & 0xFF;
2247 task->cdb[11] = (param_len >> 16) & 0xFF;
2248 task->cdb[12] = (param_len >> 8) & 0xFF;
2249 task->cdb[13] = param_len & 0xFF;
2250 task->cdb_size = 16;
2251 task->xfer_dir = SCSI_XFER_WRITE;
2252 task->expxferlen = param_len;
2253
2254 return task;
2255 }
2256
2257 static void iscsi_populate_target_desc(unsigned char *desc, IscsiLun *lun)
2258 {
2259 struct scsi_inquiry_device_designator *dd = lun->dd;
2260
2261 memset(desc, 0, 32);
2262 desc[0] = 0xE4; /* IDENT_DESCR_TGT_DESCR */
2263 desc[4] = dd->code_set;
2264 desc[5] = (dd->designator_type & 0xF)
2265 | ((dd->association & 3) << 4);
2266 desc[7] = dd->designator_length;
2267 memcpy(desc + 8, dd->designator, MIN(dd->designator_length, 20));
2268
2269 desc[28] = 0;
2270 desc[29] = (lun->block_size >> 16) & 0xFF;
2271 desc[30] = (lun->block_size >> 8) & 0xFF;
2272 desc[31] = lun->block_size & 0xFF;
2273 }
2274
2275 static void iscsi_xcopy_desc_hdr(uint8_t *hdr, int dc, int cat, int src_index,
2276 int dst_index)
2277 {
2278 hdr[0] = 0x02; /* BLK_TO_BLK_SEG_DESCR */
2279 hdr[1] = ((dc << 1) | cat) & 0xFF;
2280 hdr[2] = (XCOPY_BLK2BLK_SEG_DESC_SIZE >> 8) & 0xFF;
2281 /* don't account for the first 4 bytes in descriptor header*/
2282 hdr[3] = (XCOPY_BLK2BLK_SEG_DESC_SIZE - 4 /* SEG_DESC_SRC_INDEX_OFFSET */) & 0xFF;
2283 hdr[4] = (src_index >> 8) & 0xFF;
2284 hdr[5] = src_index & 0xFF;
2285 hdr[6] = (dst_index >> 8) & 0xFF;
2286 hdr[7] = dst_index & 0xFF;
2287 }
2288
2289 static void iscsi_xcopy_populate_desc(uint8_t *desc, int dc, int cat,
2290 int src_index, int dst_index, int num_blks,
2291 uint64_t src_lba, uint64_t dst_lba)
2292 {
2293 iscsi_xcopy_desc_hdr(desc, dc, cat, src_index, dst_index);
2294
2295 /* The caller should verify the request size */
2296 assert(num_blks < 65536);
2297 desc[10] = (num_blks >> 8) & 0xFF;
2298 desc[11] = num_blks & 0xFF;
2299 desc[12] = (src_lba >> 56) & 0xFF;
2300 desc[13] = (src_lba >> 48) & 0xFF;
2301 desc[14] = (src_lba >> 40) & 0xFF;
2302 desc[15] = (src_lba >> 32) & 0xFF;
2303 desc[16] = (src_lba >> 24) & 0xFF;
2304 desc[17] = (src_lba >> 16) & 0xFF;
2305 desc[18] = (src_lba >> 8) & 0xFF;
2306 desc[19] = src_lba & 0xFF;
2307 desc[20] = (dst_lba >> 56) & 0xFF;
2308 desc[21] = (dst_lba >> 48) & 0xFF;
2309 desc[22] = (dst_lba >> 40) & 0xFF;
2310 desc[23] = (dst_lba >> 32) & 0xFF;
2311 desc[24] = (dst_lba >> 24) & 0xFF;
2312 desc[25] = (dst_lba >> 16) & 0xFF;
2313 desc[26] = (dst_lba >> 8) & 0xFF;
2314 desc[27] = dst_lba & 0xFF;
2315 }
2316
2317 static void iscsi_xcopy_populate_header(unsigned char *buf, int list_id, int str,
2318 int list_id_usage, int prio,
2319 int tgt_desc_len,
2320 int seg_desc_len, int inline_data_len)
2321 {
2322 buf[0] = list_id;
2323 buf[1] = ((str & 1) << 5) | ((list_id_usage & 3) << 3) | (prio & 7);
2324 buf[2] = (tgt_desc_len >> 8) & 0xFF;
2325 buf[3] = tgt_desc_len & 0xFF;
2326 buf[8] = (seg_desc_len >> 24) & 0xFF;
2327 buf[9] = (seg_desc_len >> 16) & 0xFF;
2328 buf[10] = (seg_desc_len >> 8) & 0xFF;
2329 buf[11] = seg_desc_len & 0xFF;
2330 buf[12] = (inline_data_len >> 24) & 0xFF;
2331 buf[13] = (inline_data_len >> 16) & 0xFF;
2332 buf[14] = (inline_data_len >> 8) & 0xFF;
2333 buf[15] = inline_data_len & 0xFF;
2334 }
2335
2336 static void iscsi_xcopy_data(struct iscsi_data *data,
2337 IscsiLun *src, int64_t src_lba,
2338 IscsiLun *dst, int64_t dst_lba,
2339 uint16_t num_blocks)
2340 {
2341 uint8_t *buf;
2342 const int src_offset = XCOPY_DESC_OFFSET;
2343 const int dst_offset = XCOPY_DESC_OFFSET + IDENT_DESCR_TGT_DESCR_SIZE;
2344 const int seg_offset = dst_offset + IDENT_DESCR_TGT_DESCR_SIZE;
2345
2346 data->size = XCOPY_DESC_OFFSET +
2347 IDENT_DESCR_TGT_DESCR_SIZE * 2 +
2348 XCOPY_BLK2BLK_SEG_DESC_SIZE;
2349 data->data = g_malloc0(data->size);
2350 buf = data->data;
2351
2352 /* Initialise the parameter list header */
2353 iscsi_xcopy_populate_header(buf, 1, 0, 2 /* LIST_ID_USAGE_DISCARD */,
2354 0, 2 * IDENT_DESCR_TGT_DESCR_SIZE,
2355 XCOPY_BLK2BLK_SEG_DESC_SIZE,
2356 0);
2357
2358 /* Initialise CSCD list with one src + one dst descriptor */
2359 iscsi_populate_target_desc(&buf[src_offset], src);
2360 iscsi_populate_target_desc(&buf[dst_offset], dst);
2361
2362 /* Initialise one segment descriptor */
2363 iscsi_xcopy_populate_desc(&buf[seg_offset], 0, 0, 0, 1, num_blocks,
2364 src_lba, dst_lba);
2365 }
2366
2367 static int coroutine_fn iscsi_co_copy_range_to(BlockDriverState *bs,
2368 BdrvChild *src,
2369 uint64_t src_offset,
2370 BdrvChild *dst,
2371 uint64_t dst_offset,
2372 uint64_t bytes,
2373 BdrvRequestFlags read_flags,
2374 BdrvRequestFlags write_flags)
2375 {
2376 IscsiLun *dst_lun = dst->bs->opaque;
2377 IscsiLun *src_lun;
2378 struct IscsiTask iscsi_task;
2379 struct iscsi_data data;
2380 int r = 0;
2381 int block_size;
2382
2383 if (src->bs->drv->bdrv_co_copy_range_to != iscsi_co_copy_range_to) {
2384 return -ENOTSUP;
2385 }
2386 src_lun = src->bs->opaque;
2387
2388 if (!src_lun->dd || !dst_lun->dd) {
2389 return -ENOTSUP;
2390 }
2391 if (!is_byte_request_lun_aligned(dst_offset, bytes, dst_lun)) {
2392 return -ENOTSUP;
2393 }
2394 if (!is_byte_request_lun_aligned(src_offset, bytes, src_lun)) {
2395 return -ENOTSUP;
2396 }
2397 if (dst_lun->block_size != src_lun->block_size ||
2398 !dst_lun->block_size) {
2399 return -ENOTSUP;
2400 }
2401
2402 block_size = dst_lun->block_size;
2403 if (bytes / block_size > 65535) {
2404 return -ENOTSUP;
2405 }
2406
2407 iscsi_xcopy_data(&data,
2408 src_lun, src_offset / block_size,
2409 dst_lun, dst_offset / block_size,
2410 bytes / block_size);
2411
2412 iscsi_co_init_iscsitask(dst_lun, &iscsi_task);
2413
2414 qemu_mutex_lock(&dst_lun->mutex);
2415 iscsi_task.task = iscsi_xcopy_task(data.size);
2416 retry:
2417 if (iscsi_scsi_command_async(dst_lun->iscsi, dst_lun->lun,
2418 iscsi_task.task, iscsi_co_generic_cb,
2419 &data,
2420 &iscsi_task) != 0) {
2421 r = -EIO;
2422 goto out_unlock;
2423 }
2424
2425 iscsi_co_wait_for_task(&iscsi_task, dst_lun);
2426
2427 if (iscsi_task.do_retry) {
2428 iscsi_task.complete = 0;
2429 goto retry;
2430 }
2431
2432 if (iscsi_task.status != SCSI_STATUS_GOOD) {
2433 r = iscsi_task.err_code;
2434 goto out_unlock;
2435 }
2436
2437 out_unlock:
2438
2439 trace_iscsi_xcopy(src_lun, src_offset, dst_lun, dst_offset, bytes, r);
2440 g_free(iscsi_task.task);
2441 qemu_mutex_unlock(&dst_lun->mutex);
2442 g_free(iscsi_task.err_str);
2443 return r;
2444 }
2445
2446 static QemuOptsList iscsi_create_opts = {
2447 .name = "iscsi-create-opts",
2448 .head = QTAILQ_HEAD_INITIALIZER(iscsi_create_opts.head),
2449 .desc = {
2450 {
2451 .name = BLOCK_OPT_SIZE,
2452 .type = QEMU_OPT_SIZE,
2453 .help = "Virtual disk size"
2454 },
2455 { /* end of list */ }
2456 }
2457 };
2458
2459 static const char *const iscsi_strong_runtime_opts[] = {
2460 "transport",
2461 "portal",
2462 "target",
2463 "user",
2464 "password",
2465 "password-secret",
2466 "lun",
2467 "initiator-name",
2468 "header-digest",
2469
2470 NULL
2471 };
2472
2473 static BlockDriver bdrv_iscsi = {
2474 .format_name = "iscsi",
2475 .protocol_name = "iscsi",
2476
2477 .instance_size = sizeof(IscsiLun),
2478 .bdrv_parse_filename = iscsi_parse_filename,
2479 .bdrv_file_open = iscsi_open,
2480 .bdrv_close = iscsi_close,
2481 .bdrv_co_create_opts = iscsi_co_create_opts,
2482 .create_opts = &iscsi_create_opts,
2483 .bdrv_reopen_prepare = iscsi_reopen_prepare,
2484 .bdrv_reopen_commit = iscsi_reopen_commit,
2485 .bdrv_co_invalidate_cache = iscsi_co_invalidate_cache,
2486
2487 .bdrv_getlength = iscsi_getlength,
2488 .bdrv_get_info = iscsi_get_info,
2489 .bdrv_co_truncate = iscsi_co_truncate,
2490 .bdrv_refresh_limits = iscsi_refresh_limits,
2491
2492 .bdrv_co_block_status = iscsi_co_block_status,
2493 .bdrv_co_pdiscard = iscsi_co_pdiscard,
2494 .bdrv_co_copy_range_from = iscsi_co_copy_range_from,
2495 .bdrv_co_copy_range_to = iscsi_co_copy_range_to,
2496 .bdrv_co_pwrite_zeroes = iscsi_co_pwrite_zeroes,
2497 .bdrv_co_readv = iscsi_co_readv,
2498 .bdrv_co_writev = iscsi_co_writev,
2499 .bdrv_co_flush_to_disk = iscsi_co_flush,
2500
2501 #ifdef __linux__
2502 .bdrv_aio_ioctl = iscsi_aio_ioctl,
2503 #endif
2504
2505 .bdrv_detach_aio_context = iscsi_detach_aio_context,
2506 .bdrv_attach_aio_context = iscsi_attach_aio_context,
2507
2508 .strong_runtime_opts = iscsi_strong_runtime_opts,
2509 };
2510
2511 #if LIBISCSI_API_VERSION >= (20160603)
2512 static BlockDriver bdrv_iser = {
2513 .format_name = "iser",
2514 .protocol_name = "iser",
2515
2516 .instance_size = sizeof(IscsiLun),
2517 .bdrv_parse_filename = iscsi_parse_filename,
2518 .bdrv_file_open = iscsi_open,
2519 .bdrv_close = iscsi_close,
2520 .bdrv_co_create_opts = iscsi_co_create_opts,
2521 .create_opts = &iscsi_create_opts,
2522 .bdrv_reopen_prepare = iscsi_reopen_prepare,
2523 .bdrv_reopen_commit = iscsi_reopen_commit,
2524 .bdrv_co_invalidate_cache = iscsi_co_invalidate_cache,
2525
2526 .bdrv_getlength = iscsi_getlength,
2527 .bdrv_get_info = iscsi_get_info,
2528 .bdrv_co_truncate = iscsi_co_truncate,
2529 .bdrv_refresh_limits = iscsi_refresh_limits,
2530
2531 .bdrv_co_block_status = iscsi_co_block_status,
2532 .bdrv_co_pdiscard = iscsi_co_pdiscard,
2533 .bdrv_co_copy_range_from = iscsi_co_copy_range_from,
2534 .bdrv_co_copy_range_to = iscsi_co_copy_range_to,
2535 .bdrv_co_pwrite_zeroes = iscsi_co_pwrite_zeroes,
2536 .bdrv_co_readv = iscsi_co_readv,
2537 .bdrv_co_writev = iscsi_co_writev,
2538 .bdrv_co_flush_to_disk = iscsi_co_flush,
2539
2540 #ifdef __linux__
2541 .bdrv_aio_ioctl = iscsi_aio_ioctl,
2542 #endif
2543
2544 .bdrv_detach_aio_context = iscsi_detach_aio_context,
2545 .bdrv_attach_aio_context = iscsi_attach_aio_context,
2546
2547 .strong_runtime_opts = iscsi_strong_runtime_opts,
2548 };
2549 #endif
2550
2551 static void iscsi_block_init(void)
2552 {
2553 bdrv_register(&bdrv_iscsi);
2554 #if LIBISCSI_API_VERSION >= (20160603)
2555 bdrv_register(&bdrv_iser);
2556 #endif
2557 }
2558
2559 block_init(iscsi_block_init);
AR7 emulation for QEMU