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Merge tag 'migration-20240407-pull-request' of https://gitlab.com/peterx/qemu into...
[qemu/armbru.git] / block / iscsi.c
blob2ff14b74724d61a2d8325662b70c1b9729a8a187
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 "sysemu/sysemu.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-io.h"
37 #include "block/block_int.h"
38 #include "block/qdict.h"
39 #include "scsi/constants.h"
40 #include "qemu/iov.h"
41 #include "qemu/module.h"
42 #include "qemu/option.h"
43 #include "qemu/uuid.h"
44 #include "sysemu/replay.h"
45 #include "qapi/error.h"
46 #include "qapi/qapi-commands-machine.h"
47 #include "qapi/qmp/qdict.h"
48 #include "qapi/qmp/qstring.h"
49 #include "crypto/secret.h"
50 #include "scsi/utils.h"
51 #include "trace.h"
52
53 /* Conflict between scsi/utils.h and libiscsi! :( */
54 #define SCSI_XFER_NONE ISCSI_XFER_NONE
55 #include <iscsi/iscsi.h>
56 #define inline __attribute__((gnu_inline)) /* required for libiscsi v1.9.0 */
57 #include <iscsi/scsi-lowlevel.h>
58 #undef inline
59 #undef SCSI_XFER_NONE
60 QEMU_BUILD_BUG_ON((int)SCSI_XFER_NONE != (int)ISCSI_XFER_NONE);
61
62 #ifdef __linux__
63 #include <scsi/sg.h>
64 #endif
65
66 typedef struct IscsiLun {
67 struct iscsi_context *iscsi;
68 AioContext *aio_context;
69 int lun;
70 enum scsi_inquiry_peripheral_device_type type;
71 int block_size;
72 uint64_t num_blocks;
73 int events;
74 QEMUTimer *nop_timer;
75 QEMUTimer *event_timer;
76 QemuMutex mutex;
77 struct scsi_inquiry_logical_block_provisioning lbp;
78 struct scsi_inquiry_block_limits bl;
79 struct scsi_inquiry_device_designator *dd;
80 unsigned char *zeroblock;
81 /* The allocmap tracks which clusters (pages) on the iSCSI target are
82 * allocated and which are not. In case a target returns zeros for
83 * unallocated pages (iscsilun->lprz) we can directly return zeros instead
84 * of reading zeros over the wire if a read request falls within an
85 * unallocated block. As there are 3 possible states we need 2 bitmaps to
86 * track. allocmap_valid keeps track if QEMU's information about a page is
87 * valid. allocmap tracks if a page is allocated or not. In case QEMU has no
88 * valid information about a page the corresponding allocmap entry should be
89 * switched to unallocated as well to force a new lookup of the allocation
90 * status as lookups are generally skipped if a page is suspect to be
91 * allocated. If a iSCSI target is opened with cache.direct = on the
92 * allocmap_valid does not exist turning all cached information invalid so
93 * that a fresh lookup is made for any page even if allocmap entry returns
94 * it's unallocated. */
95 unsigned long *allocmap;
96 unsigned long *allocmap_valid;
97 long allocmap_size;
98 int cluster_size;
99 bool use_16_for_rw;
100 bool write_protected;
101 bool lbpme;
102 bool lbprz;
103 bool dpofua;
104 bool has_write_same;
105 bool request_timed_out;
106 } IscsiLun;
107
108 typedef struct IscsiTask {
109 int status;
110 int complete;
111 int retries;
112 int do_retry;
113 struct scsi_task *task;
114 Coroutine *co;
115 IscsiLun *iscsilun;
116 QEMUTimer retry_timer;
117 int err_code;
118 char *err_str;
119 } IscsiTask;
120
121 typedef struct IscsiAIOCB {
122 BlockAIOCB common;
123 QEMUBH *bh;
124 IscsiLun *iscsilun;
125 struct scsi_task *task;
126 int status;
127 int64_t sector_num;
128 int nb_sectors;
129 int ret;
130 #ifdef __linux__
131 sg_io_hdr_t *ioh;
132 #endif
133 bool cancelled;
134 } IscsiAIOCB;
135
136 /* libiscsi uses time_t so its enough to process events every second */
137 #define EVENT_INTERVAL 1000
138 #define NOP_INTERVAL 5000
139 #define MAX_NOP_FAILURES 3
140 #define ISCSI_CMD_RETRIES ARRAY_SIZE(iscsi_retry_times)
141 static const unsigned iscsi_retry_times[] = {8, 32, 128, 512, 2048, 8192, 32768};
142
143 /* this threshold is a trade-off knob to choose between
144 * the potential additional overhead of an extra GET_LBA_STATUS request
145 * vs. unnecessarily reading a lot of zero sectors over the wire.
146 * If a read request is greater or equal than ISCSI_CHECKALLOC_THRES
147 * sectors we check the allocation status of the area covered by the
148 * request first if the allocationmap indicates that the area might be
149 * unallocated. */
150 #define ISCSI_CHECKALLOC_THRES 64
151
152 #ifdef __linux__
153
154 static void
155 iscsi_bh_cb(void *p)
156 {
157 IscsiAIOCB *acb = p;
158
159 qemu_bh_delete(acb->bh);
160
161 acb->common.cb(acb->common.opaque, acb->status);
162
163 if (acb->task != NULL) {
164 scsi_free_scsi_task(acb->task);
165 acb->task = NULL;
166 }
167
168 qemu_aio_unref(acb);
169 }
170
171 static void
172 iscsi_schedule_bh(IscsiAIOCB *acb)
173 {
174 if (acb->bh) {
175 return;
176 }
177 acb->bh = aio_bh_new(acb->iscsilun->aio_context, iscsi_bh_cb, acb);
178 qemu_bh_schedule(acb->bh);
179 }
180
181 #endif
182
183 static void iscsi_co_generic_bh_cb(void *opaque)
184 {
185 struct IscsiTask *iTask = opaque;
186
187 iTask->complete = 1;
188 aio_co_wake(iTask->co);
189 }
190
191 static void iscsi_retry_timer_expired(void *opaque)
192 {
193 struct IscsiTask *iTask = opaque;
194 iTask->complete = 1;
195 if (iTask->co) {
196 aio_co_wake(iTask->co);
197 }
198 }
199
200 static inline unsigned exp_random(double mean)
201 {
202 return -mean * log((double)rand() / RAND_MAX);
203 }
204
205 /* SCSI_SENSE_ASCQ_INVALID_FIELD_IN_PARAMETER_LIST was introduced in
206 * libiscsi 1.10.0, together with other constants we need. Use it as
207 * a hint that we have to define them ourselves if needed, to keep the
208 * minimum required libiscsi version at 1.9.0. We use an ASCQ macro for
209 * the test because SCSI_STATUS_* is an enum.
210 *
211 * To guard against future changes where SCSI_SENSE_ASCQ_* also becomes
212 * an enum, check against the LIBISCSI_API_VERSION macro, which was
213 * introduced in 1.11.0. If it is present, there is no need to define
214 * anything.
215 */
216 #if !defined(SCSI_SENSE_ASCQ_INVALID_FIELD_IN_PARAMETER_LIST) && \
217 !defined(LIBISCSI_API_VERSION)
218 #define SCSI_STATUS_TASK_SET_FULL 0x28
219 #define SCSI_STATUS_TIMEOUT 0x0f000002
220 #define SCSI_SENSE_ASCQ_INVALID_FIELD_IN_PARAMETER_LIST 0x2600
221 #define SCSI_SENSE_ASCQ_PARAMETER_LIST_LENGTH_ERROR 0x1a00
222 #endif
223
224 #ifndef LIBISCSI_API_VERSION
225 #define LIBISCSI_API_VERSION 20130701
226 #endif
227
228 static int iscsi_translate_sense(struct scsi_sense *sense)
229 {
230 return scsi_sense_to_errno(sense->key,
231 (sense->ascq & 0xFF00) >> 8,
232 sense->ascq & 0xFF);
233 }
234
235 /* Called (via iscsi_service) with QemuMutex held. */
236 static void
237 iscsi_co_generic_cb(struct iscsi_context *iscsi, int status,
238 void *command_data, void *opaque)
239 {
240 struct IscsiTask *iTask = opaque;
241 struct scsi_task *task = command_data;
242
243 iTask->status = status;
244 iTask->do_retry = 0;
245 iTask->err_code = 0;
246 iTask->task = task;
247
248 if (status != SCSI_STATUS_GOOD) {
249 iTask->err_code = -EIO;
250 if (iTask->retries++ < ISCSI_CMD_RETRIES) {
251 if (status == SCSI_STATUS_BUSY ||
252 status == SCSI_STATUS_TIMEOUT ||
253 status == SCSI_STATUS_TASK_SET_FULL) {
254 unsigned retry_time =
255 exp_random(iscsi_retry_times[iTask->retries - 1]);
256 if (status == SCSI_STATUS_TIMEOUT) {
257 /* make sure the request is rescheduled AFTER the
258 * reconnect is initiated */
259 retry_time = EVENT_INTERVAL * 2;
260 iTask->iscsilun->request_timed_out = true;
261 }
262 error_report("iSCSI Busy/TaskSetFull/TimeOut"
263 " (retry #%u in %u ms): %s",
264 iTask->retries, retry_time,
265 iscsi_get_error(iscsi));
266 aio_timer_init(iTask->iscsilun->aio_context,
267 &iTask->retry_timer, QEMU_CLOCK_REALTIME,
268 SCALE_MS, iscsi_retry_timer_expired, iTask);
269 timer_mod(&iTask->retry_timer,
270 qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + retry_time);
271 iTask->do_retry = 1;
272 return;
273 } else if (status == SCSI_STATUS_CHECK_CONDITION) {
274 int error = iscsi_translate_sense(&task->sense);
275 if (error == EAGAIN) {
276 error_report("iSCSI CheckCondition: %s",
277 iscsi_get_error(iscsi));
278 iTask->do_retry = 1;
279 } else {
280 iTask->err_code = -error;
281 iTask->err_str = g_strdup(iscsi_get_error(iscsi));
282 }
283 }
284 }
285 }
286
287 if (iTask->co) {
288 replay_bh_schedule_oneshot_event(iTask->iscsilun->aio_context,
289 iscsi_co_generic_bh_cb, iTask);
290 } else {
291 iTask->complete = 1;
292 }
293 }
294
295 static void coroutine_fn
296 iscsi_co_init_iscsitask(IscsiLun *iscsilun, struct IscsiTask *iTask)
297 {
298 *iTask = (struct IscsiTask) {
299 .co = qemu_coroutine_self(),
300 .iscsilun = iscsilun,
301 };
302 }
303
304 #ifdef __linux__
305
306 /* Called (via iscsi_service) with QemuMutex held. */
307 static void
308 iscsi_abort_task_cb(struct iscsi_context *iscsi, int status, void *command_data,
309 void *private_data)
310 {
311 IscsiAIOCB *acb = private_data;
312
313 /* If the command callback hasn't been called yet, drop the task */
314 if (!acb->bh) {
315 /* Call iscsi_aio_ioctl_cb() with SCSI_STATUS_CANCELLED */
316 iscsi_scsi_cancel_task(iscsi, acb->task);
317 }
318
319 qemu_aio_unref(acb); /* acquired in iscsi_aio_cancel() */
320 }
321
322 static void
323 iscsi_aio_cancel(BlockAIOCB *blockacb)
324 {
325 IscsiAIOCB *acb = (IscsiAIOCB *)blockacb;
326 IscsiLun *iscsilun = acb->iscsilun;
327
328 WITH_QEMU_LOCK_GUARD(&iscsilun->mutex) {
329
330 /* If it was cancelled or completed already, our work is done here */
331 if (acb->cancelled || acb->status != -EINPROGRESS) {
332 return;
333 }
334
335 acb->cancelled = true;
336
337 qemu_aio_ref(acb); /* released in iscsi_abort_task_cb() */
338
339 /* send a task mgmt call to the target to cancel the task on the target */
340 if (iscsi_task_mgmt_abort_task_async(iscsilun->iscsi, acb->task,
341 iscsi_abort_task_cb, acb) < 0) {
342 qemu_aio_unref(acb); /* since iscsi_abort_task_cb() won't be called */
343 }
344 }
345 }
346
347 static const AIOCBInfo iscsi_aiocb_info = {
348 .aiocb_size = sizeof(IscsiAIOCB),
349 .cancel_async = iscsi_aio_cancel,
350 };
351
352 #endif
353
354 static void iscsi_process_read(void *arg);
355 static void iscsi_process_write(void *arg);
356
357 /* Called with QemuMutex held. */
358 static void
359 iscsi_set_events(IscsiLun *iscsilun)
360 {
361 struct iscsi_context *iscsi = iscsilun->iscsi;
362 int ev = iscsi_which_events(iscsi);
363
364 if (ev != iscsilun->events) {
365 aio_set_fd_handler(iscsilun->aio_context, iscsi_get_fd(iscsi),
366 (ev & POLLIN) ? iscsi_process_read : NULL,
367 (ev & POLLOUT) ? iscsi_process_write : NULL,
368 NULL, NULL,
369 iscsilun);
370 iscsilun->events = ev;
371 }
372 }
373
374 static void iscsi_timed_check_events(void *opaque)
375 {
376 IscsiLun *iscsilun = opaque;
377
378 WITH_QEMU_LOCK_GUARD(&iscsilun->mutex) {
379 /* check for timed out requests */
380 iscsi_service(iscsilun->iscsi, 0);
381
382 if (iscsilun->request_timed_out) {
383 iscsilun->request_timed_out = false;
384 iscsi_reconnect(iscsilun->iscsi);
385 }
386
387 /*
388 * newer versions of libiscsi may return zero events. Ensure we are
389 * able to return to service once this situation changes.
390 */
391 iscsi_set_events(iscsilun);
392 }
393
394 timer_mod(iscsilun->event_timer,
395 qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + EVENT_INTERVAL);
396 }
397
398 static void
399 iscsi_process_read(void *arg)
400 {
401 IscsiLun *iscsilun = arg;
402 struct iscsi_context *iscsi = iscsilun->iscsi;
403
404 qemu_mutex_lock(&iscsilun->mutex);
405 iscsi_service(iscsi, POLLIN);
406 iscsi_set_events(iscsilun);
407 qemu_mutex_unlock(&iscsilun->mutex);
408 }
409
410 static void
411 iscsi_process_write(void *arg)
412 {
413 IscsiLun *iscsilun = arg;
414 struct iscsi_context *iscsi = iscsilun->iscsi;
415
416 qemu_mutex_lock(&iscsilun->mutex);
417 iscsi_service(iscsi, POLLOUT);
418 iscsi_set_events(iscsilun);
419 qemu_mutex_unlock(&iscsilun->mutex);
420 }
421
422 static int64_t sector_lun2qemu(int64_t sector, IscsiLun *iscsilun)
423 {
424 return sector * iscsilun->block_size / BDRV_SECTOR_SIZE;
425 }
426
427 static int64_t sector_qemu2lun(int64_t sector, IscsiLun *iscsilun)
428 {
429 return sector * BDRV_SECTOR_SIZE / iscsilun->block_size;
430 }
431
432 static bool is_byte_request_lun_aligned(int64_t offset, int64_t bytes,
433 IscsiLun *iscsilun)
434 {
435 if (offset % iscsilun->block_size || bytes % iscsilun->block_size) {
436 error_report("iSCSI misaligned request: "
437 "iscsilun->block_size %u, offset %" PRIi64
438 ", bytes %" PRIi64,
439 iscsilun->block_size, offset, bytes);
440 return false;
441 }
442 return true;
443 }
444
445 static bool is_sector_request_lun_aligned(int64_t sector_num, int nb_sectors,
446 IscsiLun *iscsilun)
447 {
448 assert(nb_sectors <= BDRV_REQUEST_MAX_SECTORS);
449 return is_byte_request_lun_aligned(sector_num << BDRV_SECTOR_BITS,
450 nb_sectors << BDRV_SECTOR_BITS,
451 iscsilun);
452 }
453
454 static void iscsi_allocmap_free(IscsiLun *iscsilun)
455 {
456 g_free(iscsilun->allocmap);
457 g_free(iscsilun->allocmap_valid);
458 iscsilun->allocmap = NULL;
459 iscsilun->allocmap_valid = NULL;
460 }
461
462
463 static int iscsi_allocmap_init(IscsiLun *iscsilun, int open_flags)
464 {
465 iscsi_allocmap_free(iscsilun);
466
467 assert(iscsilun->cluster_size);
468 iscsilun->allocmap_size =
469 DIV_ROUND_UP(iscsilun->num_blocks * iscsilun->block_size,
470 iscsilun->cluster_size);
471
472 iscsilun->allocmap = bitmap_try_new(iscsilun->allocmap_size);
473 if (!iscsilun->allocmap) {
474 return -ENOMEM;
475 }
476
477 if (open_flags & BDRV_O_NOCACHE) {
478 /* when cache.direct = on all allocmap entries are
479 * treated as invalid to force a relookup of the block
480 * status on every read request */
481 return 0;
482 }
483
484 iscsilun->allocmap_valid = bitmap_try_new(iscsilun->allocmap_size);
485 if (!iscsilun->allocmap_valid) {
486 /* if we are under memory pressure free the allocmap as well */
487 iscsi_allocmap_free(iscsilun);
488 return -ENOMEM;
489 }
490
491 return 0;
492 }
493
494 static void
495 iscsi_allocmap_update(IscsiLun *iscsilun, int64_t offset,
496 int64_t bytes, bool allocated, bool valid)
497 {
498 int64_t cl_num_expanded, nb_cls_expanded, cl_num_shrunk, nb_cls_shrunk;
499
500 if (iscsilun->allocmap == NULL) {
501 return;
502 }
503 /* expand to entirely contain all affected clusters */
504 assert(iscsilun->cluster_size);
505 cl_num_expanded = offset / iscsilun->cluster_size;
506 nb_cls_expanded = DIV_ROUND_UP(offset + bytes,
507 iscsilun->cluster_size) - cl_num_expanded;
508 /* shrink to touch only completely contained clusters */
509 cl_num_shrunk = DIV_ROUND_UP(offset, iscsilun->cluster_size);
510 nb_cls_shrunk = (offset + bytes) / iscsilun->cluster_size - cl_num_shrunk;
511 if (allocated) {
512 bitmap_set(iscsilun->allocmap, cl_num_expanded, nb_cls_expanded);
513 } else {
514 if (nb_cls_shrunk > 0) {
515 bitmap_clear(iscsilun->allocmap, cl_num_shrunk, nb_cls_shrunk);
516 }
517 }
518
519 if (iscsilun->allocmap_valid == NULL) {
520 return;
521 }
522 if (valid) {
523 if (nb_cls_shrunk > 0) {
524 bitmap_set(iscsilun->allocmap_valid, cl_num_shrunk, nb_cls_shrunk);
525 }
526 } else {
527 bitmap_clear(iscsilun->allocmap_valid, cl_num_expanded,
528 nb_cls_expanded);
529 }
530 }
531
532 static void
533 iscsi_allocmap_set_allocated(IscsiLun *iscsilun, int64_t offset,
534 int64_t bytes)
535 {
536 iscsi_allocmap_update(iscsilun, offset, bytes, true, true);
537 }
538
539 static void
540 iscsi_allocmap_set_unallocated(IscsiLun *iscsilun, int64_t offset,
541 int64_t bytes)
542 {
543 /* Note: if cache.direct=on the fifth argument to iscsi_allocmap_update
544 * is ignored, so this will in effect be an iscsi_allocmap_set_invalid.
545 */
546 iscsi_allocmap_update(iscsilun, offset, bytes, false, true);
547 }
548
549 static void iscsi_allocmap_set_invalid(IscsiLun *iscsilun, int64_t offset,
550 int64_t bytes)
551 {
552 iscsi_allocmap_update(iscsilun, offset, bytes, false, false);
553 }
554
555 static void iscsi_allocmap_invalidate(IscsiLun *iscsilun)
556 {
557 if (iscsilun->allocmap) {
558 bitmap_zero(iscsilun->allocmap, iscsilun->allocmap_size);
559 }
560 if (iscsilun->allocmap_valid) {
561 bitmap_zero(iscsilun->allocmap_valid, iscsilun->allocmap_size);
562 }
563 }
564
565 static inline bool
566 iscsi_allocmap_is_allocated(IscsiLun *iscsilun, int64_t offset,
567 int64_t bytes)
568 {
569 unsigned long size;
570 if (iscsilun->allocmap == NULL) {
571 return true;
572 }
573 assert(iscsilun->cluster_size);
574 size = DIV_ROUND_UP(offset + bytes, iscsilun->cluster_size);
575 return !(find_next_bit(iscsilun->allocmap, size,
576 offset / iscsilun->cluster_size) == size);
577 }
578
579 static inline bool iscsi_allocmap_is_valid(IscsiLun *iscsilun,
580 int64_t offset, int64_t bytes)
581 {
582 unsigned long size;
583 if (iscsilun->allocmap_valid == NULL) {
584 return false;
585 }
586 assert(iscsilun->cluster_size);
587 size = DIV_ROUND_UP(offset + bytes, iscsilun->cluster_size);
588 return (find_next_zero_bit(iscsilun->allocmap_valid, size,
589 offset / iscsilun->cluster_size) == size);
590 }
591
592 static void coroutine_fn iscsi_co_wait_for_task(IscsiTask *iTask,
593 IscsiLun *iscsilun)
594 {
595 while (!iTask->complete) {
596 iscsi_set_events(iscsilun);
597 qemu_mutex_unlock(&iscsilun->mutex);
598 qemu_coroutine_yield();
599 qemu_mutex_lock(&iscsilun->mutex);
600 }
601 }
602
603 static int coroutine_fn
604 iscsi_co_writev(BlockDriverState *bs, int64_t sector_num, int nb_sectors,
605 QEMUIOVector *iov, int flags)
606 {
607 IscsiLun *iscsilun = bs->opaque;
608 struct IscsiTask iTask;
609 uint64_t lba;
610 uint32_t num_sectors;
611 bool fua = flags & BDRV_REQ_FUA;
612 int r = 0;
613
614 if (fua) {
615 assert(iscsilun->dpofua);
616 }
617 if (!is_sector_request_lun_aligned(sector_num, nb_sectors, iscsilun)) {
618 return -EINVAL;
619 }
620
621 if (bs->bl.max_transfer) {
622 assert(nb_sectors << BDRV_SECTOR_BITS <= bs->bl.max_transfer);
623 }
624
625 lba = sector_qemu2lun(sector_num, iscsilun);
626 num_sectors = sector_qemu2lun(nb_sectors, iscsilun);
627 iscsi_co_init_iscsitask(iscsilun, &iTask);
628 qemu_mutex_lock(&iscsilun->mutex);
629 retry:
630 if (iscsilun->use_16_for_rw) {
631 #if LIBISCSI_API_VERSION >= (20160603)
632 iTask.task = iscsi_write16_iov_task(iscsilun->iscsi, iscsilun->lun, lba,
633 NULL, num_sectors * iscsilun->block_size,
634 iscsilun->block_size, 0, 0, fua, 0, 0,
635 iscsi_co_generic_cb, &iTask,
636 (struct scsi_iovec *)iov->iov, iov->niov);
637 } else {
638 iTask.task = iscsi_write10_iov_task(iscsilun->iscsi, iscsilun->lun, lba,
639 NULL, num_sectors * iscsilun->block_size,
640 iscsilun->block_size, 0, 0, fua, 0, 0,
641 iscsi_co_generic_cb, &iTask,
642 (struct scsi_iovec *)iov->iov, iov->niov);
643 }
644 #else
645 iTask.task = iscsi_write16_task(iscsilun->iscsi, iscsilun->lun, lba,
646 NULL, num_sectors * iscsilun->block_size,
647 iscsilun->block_size, 0, 0, fua, 0, 0,
648 iscsi_co_generic_cb, &iTask);
649 } else {
650 iTask.task = iscsi_write10_task(iscsilun->iscsi, iscsilun->lun, lba,
651 NULL, num_sectors * iscsilun->block_size,
652 iscsilun->block_size, 0, 0, fua, 0, 0,
653 iscsi_co_generic_cb, &iTask);
654 }
655 #endif
656 if (iTask.task == NULL) {
657 qemu_mutex_unlock(&iscsilun->mutex);
658 return -ENOMEM;
659 }
660 #if LIBISCSI_API_VERSION < (20160603)
661 scsi_task_set_iov_out(iTask.task, (struct scsi_iovec *) iov->iov,
662 iov->niov);
663 #endif
664 iscsi_co_wait_for_task(&iTask, iscsilun);
665
666 if (iTask.task != NULL) {
667 scsi_free_scsi_task(iTask.task);
668 iTask.task = NULL;
669 }
670
671 if (iTask.do_retry) {
672 iTask.complete = 0;
673 goto retry;
674 }
675
676 if (iTask.status != SCSI_STATUS_GOOD) {
677 iscsi_allocmap_set_invalid(iscsilun, sector_num * BDRV_SECTOR_SIZE,
678 nb_sectors * BDRV_SECTOR_SIZE);
679 error_report("iSCSI WRITE10/16 failed at lba %" PRIu64 ": %s", lba,
680 iTask.err_str);
681 r = iTask.err_code;
682 goto out_unlock;
683 }
684
685 iscsi_allocmap_set_allocated(iscsilun, sector_num * BDRV_SECTOR_SIZE,
686 nb_sectors * BDRV_SECTOR_SIZE);
687
688 out_unlock:
689 qemu_mutex_unlock(&iscsilun->mutex);
690 g_free(iTask.err_str);
691 return r;
692 }
693
694
695
696 static int coroutine_fn iscsi_co_block_status(BlockDriverState *bs,
697 bool want_zero, int64_t offset,
698 int64_t bytes, int64_t *pnum,
699 int64_t *map,
700 BlockDriverState **file)
701 {
702 IscsiLun *iscsilun = bs->opaque;
703 struct scsi_get_lba_status *lbas = NULL;
704 struct scsi_lba_status_descriptor *lbasd = NULL;
705 struct IscsiTask iTask;
706 uint64_t lba, max_bytes;
707 int ret;
708
709 iscsi_co_init_iscsitask(iscsilun, &iTask);
710
711 assert(QEMU_IS_ALIGNED(offset | bytes, iscsilun->block_size));
712
713 /* default to all sectors allocated */
714 ret = BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID;
715 if (map) {
716 *map = offset;
717 }
718 *pnum = bytes;
719
720 /* LUN does not support logical block provisioning */
721 if (!iscsilun->lbpme) {
722 goto out;
723 }
724
725 lba = offset / iscsilun->block_size;
726 max_bytes = (iscsilun->num_blocks - lba) * iscsilun->block_size;
727
728 qemu_mutex_lock(&iscsilun->mutex);
729 retry:
730 if (iscsi_get_lba_status_task(iscsilun->iscsi, iscsilun->lun,
731 lba, 8 + 16, iscsi_co_generic_cb,
732 &iTask) == NULL) {
733 ret = -ENOMEM;
734 goto out_unlock;
735 }
736 iscsi_co_wait_for_task(&iTask, iscsilun);
737
738 if (iTask.do_retry) {
739 if (iTask.task != NULL) {
740 scsi_free_scsi_task(iTask.task);
741 iTask.task = NULL;
742 }
743 iTask.complete = 0;
744 goto retry;
745 }
746
747 if (iTask.status != SCSI_STATUS_GOOD) {
748 /* in case the get_lba_status_callout fails (i.e.
749 * because the device is busy or the cmd is not
750 * supported) we pretend all blocks are allocated
751 * for backwards compatibility */
752 error_report("iSCSI GET_LBA_STATUS failed at lba %" PRIu64 ": %s",
753 lba, iTask.err_str);
754 goto out_unlock;
755 }
756
757 lbas = scsi_datain_unmarshall(iTask.task);
758 if (lbas == NULL || lbas->num_descriptors == 0) {
759 ret = -EIO;
760 goto out_unlock;
761 }
762
763 lbasd = &lbas->descriptors[0];
764
765 if (lba != lbasd->lba) {
766 ret = -EIO;
767 goto out_unlock;
768 }
769
770 *pnum = MIN((int64_t) lbasd->num_blocks * iscsilun->block_size, max_bytes);
771
772 if (lbasd->provisioning == SCSI_PROVISIONING_TYPE_DEALLOCATED ||
773 lbasd->provisioning == SCSI_PROVISIONING_TYPE_ANCHORED) {
774 ret &= ~BDRV_BLOCK_DATA;
775 if (iscsilun->lbprz) {
776 ret |= BDRV_BLOCK_ZERO;
777 }
778 }
779
780 if (ret & BDRV_BLOCK_ZERO) {
781 iscsi_allocmap_set_unallocated(iscsilun, offset, *pnum);
782 } else {
783 iscsi_allocmap_set_allocated(iscsilun, offset, *pnum);
784 }
785
786 out_unlock:
787 qemu_mutex_unlock(&iscsilun->mutex);
788 g_free(iTask.err_str);
789 out:
790 if (iTask.task != NULL) {
791 scsi_free_scsi_task(iTask.task);
792 }
793 if (ret > 0 && ret & BDRV_BLOCK_OFFSET_VALID && file) {
794 *file = bs;
795 }
796 return ret;
797 }
798
799 static int coroutine_fn iscsi_co_readv(BlockDriverState *bs,
800 int64_t sector_num, int nb_sectors,
801 QEMUIOVector *iov)
802 {
803 IscsiLun *iscsilun = bs->opaque;
804 struct IscsiTask iTask;
805 uint64_t lba;
806 uint32_t num_sectors;
807 int r = 0;
808
809 if (!is_sector_request_lun_aligned(sector_num, nb_sectors, iscsilun)) {
810 return -EINVAL;
811 }
812
813 if (bs->bl.max_transfer) {
814 assert(nb_sectors << BDRV_SECTOR_BITS <= bs->bl.max_transfer);
815 }
816
817 /* if cache.direct is off and we have a valid entry in our allocation map
818 * we can skip checking the block status and directly return zeroes if
819 * the request falls within an unallocated area */
820 if (iscsi_allocmap_is_valid(iscsilun, sector_num * BDRV_SECTOR_SIZE,
821 nb_sectors * BDRV_SECTOR_SIZE) &&
822 !iscsi_allocmap_is_allocated(iscsilun, sector_num * BDRV_SECTOR_SIZE,
823 nb_sectors * BDRV_SECTOR_SIZE)) {
824 qemu_iovec_memset(iov, 0, 0x00, iov->size);
825 return 0;
826 }
827
828 if (nb_sectors >= ISCSI_CHECKALLOC_THRES &&
829 !iscsi_allocmap_is_valid(iscsilun, sector_num * BDRV_SECTOR_SIZE,
830 nb_sectors * BDRV_SECTOR_SIZE) &&
831 !iscsi_allocmap_is_allocated(iscsilun, sector_num * BDRV_SECTOR_SIZE,
832 nb_sectors * BDRV_SECTOR_SIZE)) {
833 int64_t pnum;
834 /* check the block status from the beginning of the cluster
835 * containing the start sector */
836 int64_t head;
837 int ret;
838
839 assert(iscsilun->cluster_size);
840 head = (sector_num * BDRV_SECTOR_SIZE) % iscsilun->cluster_size;
841 ret = iscsi_co_block_status(bs, true,
842 sector_num * BDRV_SECTOR_SIZE - head,
843 BDRV_REQUEST_MAX_BYTES, &pnum, NULL, NULL);
844 if (ret < 0) {
845 return ret;
846 }
847 /* if the whole request falls into an unallocated area we can avoid
848 * reading and directly return zeroes instead */
849 if (ret & BDRV_BLOCK_ZERO &&
850 pnum >= nb_sectors * BDRV_SECTOR_SIZE + head) {
851 qemu_iovec_memset(iov, 0, 0x00, iov->size);
852 return 0;
853 }
854 }
855
856 lba = sector_qemu2lun(sector_num, iscsilun);
857 num_sectors = sector_qemu2lun(nb_sectors, iscsilun);
858
859 iscsi_co_init_iscsitask(iscsilun, &iTask);
860 qemu_mutex_lock(&iscsilun->mutex);
861 retry:
862 if (iscsilun->use_16_for_rw) {
863 #if LIBISCSI_API_VERSION >= (20160603)
864 iTask.task = iscsi_read16_iov_task(iscsilun->iscsi, iscsilun->lun, lba,
865 num_sectors * iscsilun->block_size,
866 iscsilun->block_size, 0, 0, 0, 0, 0,
867 iscsi_co_generic_cb, &iTask,
868 (struct scsi_iovec *)iov->iov, iov->niov);
869 } else {
870 iTask.task = iscsi_read10_iov_task(iscsilun->iscsi, iscsilun->lun, lba,
871 num_sectors * iscsilun->block_size,
872 iscsilun->block_size,
873 0, 0, 0, 0, 0,
874 iscsi_co_generic_cb, &iTask,
875 (struct scsi_iovec *)iov->iov, iov->niov);
876 }
877 #else
878 iTask.task = iscsi_read16_task(iscsilun->iscsi, iscsilun->lun, lba,
879 num_sectors * iscsilun->block_size,
880 iscsilun->block_size, 0, 0, 0, 0, 0,
881 iscsi_co_generic_cb, &iTask);
882 } else {
883 iTask.task = iscsi_read10_task(iscsilun->iscsi, iscsilun->lun, lba,
884 num_sectors * iscsilun->block_size,
885 iscsilun->block_size,
886 0, 0, 0, 0, 0,
887 iscsi_co_generic_cb, &iTask);
888 }
889 #endif
890 if (iTask.task == NULL) {
891 qemu_mutex_unlock(&iscsilun->mutex);
892 return -ENOMEM;
893 }
894 #if LIBISCSI_API_VERSION < (20160603)
895 scsi_task_set_iov_in(iTask.task, (struct scsi_iovec *) iov->iov, iov->niov);
896 #endif
897
898 iscsi_co_wait_for_task(&iTask, iscsilun);
899 if (iTask.task != NULL) {
900 scsi_free_scsi_task(iTask.task);
901 iTask.task = NULL;
902 }
903
904 if (iTask.do_retry) {
905 iTask.complete = 0;
906 goto retry;
907 }
908
909 if (iTask.status != SCSI_STATUS_GOOD) {
910 error_report("iSCSI READ10/16 failed at lba %" PRIu64 ": %s",
911 lba, iTask.err_str);
912 r = iTask.err_code;
913 }
914
915 qemu_mutex_unlock(&iscsilun->mutex);
916 g_free(iTask.err_str);
917 return r;
918 }
919
920 static int coroutine_fn iscsi_co_flush(BlockDriverState *bs)
921 {
922 IscsiLun *iscsilun = bs->opaque;
923 struct IscsiTask iTask;
924 int r = 0;
925
926 iscsi_co_init_iscsitask(iscsilun, &iTask);
927 qemu_mutex_lock(&iscsilun->mutex);
928 retry:
929 if (iscsi_synchronizecache10_task(iscsilun->iscsi, iscsilun->lun, 0, 0, 0,
930 0, iscsi_co_generic_cb, &iTask) == NULL) {
931 qemu_mutex_unlock(&iscsilun->mutex);
932 return -ENOMEM;
933 }
934
935 iscsi_co_wait_for_task(&iTask, iscsilun);
936
937 if (iTask.task != NULL) {
938 scsi_free_scsi_task(iTask.task);
939 iTask.task = NULL;
940 }
941
942 if (iTask.do_retry) {
943 iTask.complete = 0;
944 goto retry;
945 }
946
947 if (iTask.status != SCSI_STATUS_GOOD) {
948 error_report("iSCSI SYNCHRONIZECACHE10 failed: %s", iTask.err_str);
949 r = iTask.err_code;
950 }
951
952 qemu_mutex_unlock(&iscsilun->mutex);
953 g_free(iTask.err_str);
954 return r;
955 }
956
957 #ifdef __linux__
958 /* Called (via iscsi_service) with QemuMutex held. */
959 static void
960 iscsi_aio_ioctl_cb(struct iscsi_context *iscsi, int status,
961 void *command_data, void *opaque)
962 {
963 IscsiAIOCB *acb = opaque;
964
965 if (status == SCSI_STATUS_CANCELLED) {
966 if (!acb->bh) {
967 acb->status = -ECANCELED;
968 iscsi_schedule_bh(acb);
969 }
970 return;
971 }
972
973 acb->status = 0;
974 if (status < 0) {
975 error_report("Failed to ioctl(SG_IO) to iSCSI lun. %s",
976 iscsi_get_error(iscsi));
977 acb->status = -iscsi_translate_sense(&acb->task->sense);
978 }
979
980 acb->ioh->driver_status = 0;
981 acb->ioh->host_status = 0;
982 acb->ioh->resid = 0;
983 acb->ioh->status = status;
984
985 #define SG_ERR_DRIVER_SENSE 0x08
986
987 if (status == SCSI_STATUS_CHECK_CONDITION && acb->task->datain.size >= 2) {
988 int ss;
989
990 acb->ioh->driver_status |= SG_ERR_DRIVER_SENSE;
991
992 acb->ioh->sb_len_wr = acb->task->datain.size - 2;
993 ss = MIN(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 /* Must use malloc(): this is freed via scsi_free_scsi_task() */
1062 acb->task = malloc(sizeof(struct scsi_task));
1063 if (acb->task == NULL) {
1064 error_report("iSCSI: Failed to allocate task for scsi command. %s",
1065 iscsi_get_error(iscsi));
1066 qemu_aio_unref(acb);
1067 return NULL;
1068 }
1069 memset(acb->task, 0, sizeof(struct scsi_task));
1070
1071 switch (acb->ioh->dxfer_direction) {
1072 case SG_DXFER_TO_DEV:
1073 acb->task->xfer_dir = SCSI_XFER_WRITE;
1074 break;
1075 case SG_DXFER_FROM_DEV:
1076 acb->task->xfer_dir = SCSI_XFER_READ;
1077 break;
1078 default:
1079 acb->task->xfer_dir = SCSI_XFER_NONE;
1080 break;
1081 }
1082
1083 acb->task->cdb_size = acb->ioh->cmd_len;
1084 memcpy(&acb->task->cdb[0], acb->ioh->cmdp, acb->ioh->cmd_len);
1085 acb->task->expxferlen = acb->ioh->dxfer_len;
1086
1087 data.size = 0;
1088 qemu_mutex_lock(&iscsilun->mutex);
1089 if (acb->task->xfer_dir == SCSI_XFER_WRITE) {
1090 if (acb->ioh->iovec_count == 0) {
1091 data.data = acb->ioh->dxferp;
1092 data.size = acb->ioh->dxfer_len;
1093 } else {
1094 scsi_task_set_iov_out(acb->task,
1095 (struct scsi_iovec *) acb->ioh->dxferp,
1096 acb->ioh->iovec_count);
1097 }
1098 }
1099
1100 if (iscsi_scsi_command_async(iscsi, iscsilun->lun, acb->task,
1101 iscsi_aio_ioctl_cb,
1102 (data.size > 0) ? &data : NULL,
1103 acb) != 0) {
1104 qemu_mutex_unlock(&iscsilun->mutex);
1105 scsi_free_scsi_task(acb->task);
1106 qemu_aio_unref(acb);
1107 return NULL;
1108 }
1109
1110 /* tell libiscsi to read straight into the buffer we got from ioctl */
1111 if (acb->task->xfer_dir == SCSI_XFER_READ) {
1112 if (acb->ioh->iovec_count == 0) {
1113 scsi_task_add_data_in_buffer(acb->task,
1114 acb->ioh->dxfer_len,
1115 acb->ioh->dxferp);
1116 } else {
1117 scsi_task_set_iov_in(acb->task,
1118 (struct scsi_iovec *) acb->ioh->dxferp,
1119 acb->ioh->iovec_count);
1120 }
1121 }
1122
1123 iscsi_set_events(iscsilun);
1124 qemu_mutex_unlock(&iscsilun->mutex);
1125
1126 return &acb->common;
1127 }
1128
1129 #endif
1130
1131 static int64_t coroutine_fn
1132 iscsi_co_getlength(BlockDriverState *bs)
1133 {
1134 IscsiLun *iscsilun = bs->opaque;
1135 int64_t len;
1136
1137 len = iscsilun->num_blocks;
1138 len *= iscsilun->block_size;
1139
1140 return len;
1141 }
1142
1143 static int
1144 coroutine_fn iscsi_co_pdiscard(BlockDriverState *bs, int64_t offset,
1145 int64_t bytes)
1146 {
1147 IscsiLun *iscsilun = bs->opaque;
1148 struct IscsiTask iTask;
1149 struct unmap_list list;
1150 int r = 0;
1151
1152 if (!is_byte_request_lun_aligned(offset, bytes, iscsilun)) {
1153 return -ENOTSUP;
1154 }
1155
1156 if (!iscsilun->lbp.lbpu) {
1157 /* UNMAP is not supported by the target */
1158 return 0;
1159 }
1160
1161 /*
1162 * We don't want to overflow list.num which is uint32_t.
1163 * We rely on our max_pdiscard.
1164 */
1165 assert(bytes / iscsilun->block_size <= UINT32_MAX);
1166
1167 list.lba = offset / iscsilun->block_size;
1168 list.num = bytes / iscsilun->block_size;
1169
1170 iscsi_co_init_iscsitask(iscsilun, &iTask);
1171 qemu_mutex_lock(&iscsilun->mutex);
1172 retry:
1173 if (iscsi_unmap_task(iscsilun->iscsi, iscsilun->lun, 0, 0, &list, 1,
1174 iscsi_co_generic_cb, &iTask) == NULL) {
1175 r = -ENOMEM;
1176 goto out_unlock;
1177 }
1178
1179 iscsi_co_wait_for_task(&iTask, iscsilun);
1180
1181 if (iTask.task != NULL) {
1182 scsi_free_scsi_task(iTask.task);
1183 iTask.task = NULL;
1184 }
1185
1186 if (iTask.do_retry) {
1187 iTask.complete = 0;
1188 goto retry;
1189 }
1190
1191 iscsi_allocmap_set_invalid(iscsilun, offset, bytes);
1192
1193 if (iTask.status == SCSI_STATUS_CHECK_CONDITION) {
1194 /* the target might fail with a check condition if it
1195 is not happy with the alignment of the UNMAP request
1196 we silently fail in this case */
1197 goto out_unlock;
1198 }
1199
1200 if (iTask.status != SCSI_STATUS_GOOD) {
1201 error_report("iSCSI UNMAP failed at lba %" PRIu64 ": %s",
1202 list.lba, iTask.err_str);
1203 r = iTask.err_code;
1204 goto out_unlock;
1205 }
1206
1207 out_unlock:
1208 qemu_mutex_unlock(&iscsilun->mutex);
1209 g_free(iTask.err_str);
1210 return r;
1211 }
1212
1213 static int
1214 coroutine_fn iscsi_co_pwrite_zeroes(BlockDriverState *bs, int64_t offset,
1215 int64_t bytes, BdrvRequestFlags flags)
1216 {
1217 IscsiLun *iscsilun = bs->opaque;
1218 struct IscsiTask iTask;
1219 uint64_t lba;
1220 uint64_t nb_blocks;
1221 bool use_16_for_ws = iscsilun->use_16_for_rw;
1222 int r = 0;
1223
1224 if (!is_byte_request_lun_aligned(offset, bytes, iscsilun)) {
1225 return -ENOTSUP;
1226 }
1227
1228 if (flags & BDRV_REQ_MAY_UNMAP) {
1229 if (!use_16_for_ws && !iscsilun->lbp.lbpws10) {
1230 /* WRITESAME10 with UNMAP is unsupported try WRITESAME16 */
1231 use_16_for_ws = true;
1232 }
1233 if (use_16_for_ws && !iscsilun->lbp.lbpws) {
1234 /* WRITESAME16 with UNMAP is not supported by the target,
1235 * fall back and try WRITESAME10/16 without UNMAP */
1236 flags &= ~BDRV_REQ_MAY_UNMAP;
1237 use_16_for_ws = iscsilun->use_16_for_rw;
1238 }
1239 }
1240
1241 if (!(flags & BDRV_REQ_MAY_UNMAP) && !iscsilun->has_write_same) {
1242 /* WRITESAME without UNMAP is not supported by the target */
1243 return -ENOTSUP;
1244 }
1245
1246 lba = offset / iscsilun->block_size;
1247 nb_blocks = bytes / iscsilun->block_size;
1248
1249 if (iscsilun->zeroblock == NULL) {
1250 iscsilun->zeroblock = g_try_malloc0(iscsilun->block_size);
1251 if (iscsilun->zeroblock == NULL) {
1252 return -ENOMEM;
1253 }
1254 }
1255
1256 qemu_mutex_lock(&iscsilun->mutex);
1257 iscsi_co_init_iscsitask(iscsilun, &iTask);
1258 retry:
1259 if (use_16_for_ws) {
1260 /*
1261 * iscsi_writesame16_task num_blocks argument is uint32_t. We rely here
1262 * on our max_pwrite_zeroes limit.
1263 */
1264 assert(nb_blocks <= UINT32_MAX);
1265 iTask.task = iscsi_writesame16_task(iscsilun->iscsi, iscsilun->lun, lba,
1266 iscsilun->zeroblock, iscsilun->block_size,
1267 nb_blocks, 0, !!(flags & BDRV_REQ_MAY_UNMAP),
1268 0, 0, iscsi_co_generic_cb, &iTask);
1269 } else {
1270 /*
1271 * iscsi_writesame10_task num_blocks argument is uint16_t. We rely here
1272 * on our max_pwrite_zeroes limit.
1273 */
1274 assert(nb_blocks <= UINT16_MAX);
1275 iTask.task = iscsi_writesame10_task(iscsilun->iscsi, iscsilun->lun, lba,
1276 iscsilun->zeroblock, iscsilun->block_size,
1277 nb_blocks, 0, !!(flags & BDRV_REQ_MAY_UNMAP),
1278 0, 0, iscsi_co_generic_cb, &iTask);
1279 }
1280 if (iTask.task == NULL) {
1281 qemu_mutex_unlock(&iscsilun->mutex);
1282 return -ENOMEM;
1283 }
1284
1285 iscsi_co_wait_for_task(&iTask, iscsilun);
1286
1287 if (iTask.status == SCSI_STATUS_CHECK_CONDITION &&
1288 iTask.task->sense.key == SCSI_SENSE_ILLEGAL_REQUEST &&
1289 (iTask.task->sense.ascq == SCSI_SENSE_ASCQ_INVALID_OPERATION_CODE ||
1290 iTask.task->sense.ascq == SCSI_SENSE_ASCQ_INVALID_FIELD_IN_CDB)) {
1291 /* WRITE SAME is not supported by the target */
1292 iscsilun->has_write_same = false;
1293 scsi_free_scsi_task(iTask.task);
1294 r = -ENOTSUP;
1295 goto out_unlock;
1296 }
1297
1298 if (iTask.task != NULL) {
1299 scsi_free_scsi_task(iTask.task);
1300 iTask.task = NULL;
1301 }
1302
1303 if (iTask.do_retry) {
1304 iTask.complete = 0;
1305 goto retry;
1306 }
1307
1308 if (iTask.status != SCSI_STATUS_GOOD) {
1309 iscsi_allocmap_set_invalid(iscsilun, offset, bytes);
1310 error_report("iSCSI WRITESAME10/16 failed at lba %" PRIu64 ": %s",
1311 lba, iTask.err_str);
1312 r = iTask.err_code;
1313 goto out_unlock;
1314 }
1315
1316 if (flags & BDRV_REQ_MAY_UNMAP) {
1317 iscsi_allocmap_set_invalid(iscsilun, offset, bytes);
1318 } else {
1319 iscsi_allocmap_set_allocated(iscsilun, offset, bytes);
1320 }
1321
1322 out_unlock:
1323 qemu_mutex_unlock(&iscsilun->mutex);
1324 g_free(iTask.err_str);
1325 return r;
1326 }
1327
1328 static void apply_chap(struct iscsi_context *iscsi, QemuOpts *opts,
1329 Error **errp)
1330 {
1331 const char *user = NULL;
1332 const char *password = NULL;
1333 const char *secretid;
1334 char *secret = NULL;
1335
1336 user = qemu_opt_get(opts, "user");
1337 if (!user) {
1338 return;
1339 }
1340
1341 secretid = qemu_opt_get(opts, "password-secret");
1342 password = qemu_opt_get(opts, "password");
1343 if (secretid && password) {
1344 error_setg(errp, "'password' and 'password-secret' properties are "
1345 "mutually exclusive");
1346 return;
1347 }
1348 if (secretid) {
1349 secret = qcrypto_secret_lookup_as_utf8(secretid, errp);
1350 if (!secret) {
1351 return;
1352 }
1353 password = secret;
1354 } else if (!password) {
1355 error_setg(errp, "CHAP username specified but no password was given");
1356 return;
1357 } else {
1358 warn_report("iSCSI block driver 'password' option is deprecated, "
1359 "use 'password-secret' instead");
1360 }
1361
1362 if (iscsi_set_initiator_username_pwd(iscsi, user, password)) {
1363 error_setg(errp, "Failed to set initiator username and password");
1364 }
1365
1366 g_free(secret);
1367 }
1368
1369 static void apply_header_digest(struct iscsi_context *iscsi, QemuOpts *opts,
1370 Error **errp)
1371 {
1372 const char *digest = NULL;
1373
1374 digest = qemu_opt_get(opts, "header-digest");
1375 if (!digest) {
1376 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE_CRC32C);
1377 } else if (!strcmp(digest, "crc32c")) {
1378 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_CRC32C);
1379 } else if (!strcmp(digest, "none")) {
1380 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE);
1381 } else if (!strcmp(digest, "crc32c-none")) {
1382 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_CRC32C_NONE);
1383 } else if (!strcmp(digest, "none-crc32c")) {
1384 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE_CRC32C);
1385 } else {
1386 error_setg(errp, "Invalid header-digest setting : %s", digest);
1387 }
1388 }
1389
1390 static char *get_initiator_name(QemuOpts *opts)
1391 {
1392 const char *name;
1393 char *iscsi_name;
1394 UuidInfo *uuid_info;
1395
1396 name = qemu_opt_get(opts, "initiator-name");
1397 if (name) {
1398 return g_strdup(name);
1399 }
1400
1401 uuid_info = qmp_query_uuid(NULL);
1402 if (strcmp(uuid_info->UUID, UUID_NONE) == 0) {
1403 name = qemu_get_vm_name();
1404 } else {
1405 name = uuid_info->UUID;
1406 }
1407 iscsi_name = g_strdup_printf("iqn.2008-11.org.linux-kvm%s%s",
1408 name ? ":" : "", name ? name : "");
1409 qapi_free_UuidInfo(uuid_info);
1410 return iscsi_name;
1411 }
1412
1413 static void iscsi_nop_timed_event(void *opaque)
1414 {
1415 IscsiLun *iscsilun = opaque;
1416
1417 QEMU_LOCK_GUARD(&iscsilun->mutex);
1418 if (iscsi_get_nops_in_flight(iscsilun->iscsi) >= MAX_NOP_FAILURES) {
1419 error_report("iSCSI: NOP timeout. Reconnecting...");
1420 iscsilun->request_timed_out = true;
1421 } else if (iscsi_nop_out_async(iscsilun->iscsi, NULL, NULL, 0, NULL) != 0) {
1422 error_report("iSCSI: failed to sent NOP-Out. Disabling NOP messages.");
1423 return;
1424 }
1425
1426 timer_mod(iscsilun->nop_timer, qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + NOP_INTERVAL);
1427 iscsi_set_events(iscsilun);
1428 }
1429
1430 static void iscsi_readcapacity_sync(IscsiLun *iscsilun, Error **errp)
1431 {
1432 struct scsi_task *task = NULL;
1433 struct scsi_readcapacity10 *rc10 = NULL;
1434 struct scsi_readcapacity16 *rc16 = NULL;
1435 int retries = ISCSI_CMD_RETRIES;
1436
1437 do {
1438 if (task != NULL) {
1439 scsi_free_scsi_task(task);
1440 task = NULL;
1441 }
1442
1443 switch (iscsilun->type) {
1444 case TYPE_DISK:
1445 task = iscsi_readcapacity16_sync(iscsilun->iscsi, iscsilun->lun);
1446 if (task != NULL && task->status == SCSI_STATUS_GOOD) {
1447 rc16 = scsi_datain_unmarshall(task);
1448 if (rc16 == NULL) {
1449 error_setg(errp, "iSCSI: Failed to unmarshall readcapacity16 data.");
1450 } else {
1451 iscsilun->block_size = rc16->block_length;
1452 iscsilun->num_blocks = rc16->returned_lba + 1;
1453 iscsilun->lbpme = !!rc16->lbpme;
1454 iscsilun->lbprz = !!rc16->lbprz;
1455 iscsilun->use_16_for_rw = (rc16->returned_lba > 0xffffffff);
1456 }
1457 break;
1458 }
1459 if (task != NULL && task->status == SCSI_STATUS_CHECK_CONDITION
1460 && task->sense.key == SCSI_SENSE_UNIT_ATTENTION) {
1461 break;
1462 }
1463 /* Fall through and try READ CAPACITY(10) instead. */
1464 case TYPE_ROM:
1465 task = iscsi_readcapacity10_sync(iscsilun->iscsi, iscsilun->lun, 0, 0);
1466 if (task != NULL && task->status == SCSI_STATUS_GOOD) {
1467 rc10 = scsi_datain_unmarshall(task);
1468 if (rc10 == NULL) {
1469 error_setg(errp, "iSCSI: Failed to unmarshall readcapacity10 data.");
1470 } else {
1471 iscsilun->block_size = rc10->block_size;
1472 if (rc10->lba == 0) {
1473 /* blank disk loaded */
1474 iscsilun->num_blocks = 0;
1475 } else {
1476 iscsilun->num_blocks = rc10->lba + 1;
1477 }
1478 }
1479 }
1480 break;
1481 default:
1482 return;
1483 }
1484 } while (task != NULL && task->status == SCSI_STATUS_CHECK_CONDITION
1485 && task->sense.key == SCSI_SENSE_UNIT_ATTENTION
1486 && retries-- > 0);
1487
1488 if (task == NULL || task->status != SCSI_STATUS_GOOD) {
1489 error_setg(errp, "iSCSI: failed to send readcapacity10/16 command");
1490 } else if (!iscsilun->block_size ||
1491 iscsilun->block_size % BDRV_SECTOR_SIZE) {
1492 error_setg(errp, "iSCSI: the target returned an invalid "
1493 "block size of %d.", iscsilun->block_size);
1494 }
1495 if (task) {
1496 scsi_free_scsi_task(task);
1497 }
1498 }
1499
1500 static struct scsi_task *iscsi_do_inquiry(struct iscsi_context *iscsi, int lun,
1501 int evpd, int pc, void **inq, Error **errp)
1502 {
1503 int full_size;
1504 struct scsi_task *task = NULL;
1505 task = iscsi_inquiry_sync(iscsi, lun, evpd, pc, 64);
1506 if (task == NULL || task->status != SCSI_STATUS_GOOD) {
1507 goto fail;
1508 }
1509 full_size = scsi_datain_getfullsize(task);
1510 if (full_size > task->datain.size) {
1511 scsi_free_scsi_task(task);
1512
1513 /* we need more data for the full list */
1514 task = iscsi_inquiry_sync(iscsi, lun, evpd, pc, full_size);
1515 if (task == NULL || task->status != SCSI_STATUS_GOOD) {
1516 goto fail;
1517 }
1518 }
1519
1520 *inq = scsi_datain_unmarshall(task);
1521 if (*inq == NULL) {
1522 error_setg(errp, "iSCSI: failed to unmarshall inquiry datain blob");
1523 goto fail_with_err;
1524 }
1525
1526 return task;
1527
1528 fail:
1529 error_setg(errp, "iSCSI: Inquiry command failed : %s",
1530 iscsi_get_error(iscsi));
1531 fail_with_err:
1532 if (task != NULL) {
1533 scsi_free_scsi_task(task);
1534 }
1535 return NULL;
1536 }
1537
1538 static void iscsi_detach_aio_context(BlockDriverState *bs)
1539 {
1540 IscsiLun *iscsilun = bs->opaque;
1541
1542 aio_set_fd_handler(iscsilun->aio_context, iscsi_get_fd(iscsilun->iscsi),
1543 NULL, NULL, NULL, NULL, NULL);
1544 iscsilun->events = 0;
1545
1546 if (iscsilun->nop_timer) {
1547 timer_free(iscsilun->nop_timer);
1548 iscsilun->nop_timer = NULL;
1549 }
1550 if (iscsilun->event_timer) {
1551 timer_free(iscsilun->event_timer);
1552 iscsilun->event_timer = NULL;
1553 }
1554 }
1555
1556 static void iscsi_attach_aio_context(BlockDriverState *bs,
1557 AioContext *new_context)
1558 {
1559 IscsiLun *iscsilun = bs->opaque;
1560
1561 iscsilun->aio_context = new_context;
1562 iscsi_set_events(iscsilun);
1563
1564 /* Set up a timer for sending out iSCSI NOPs */
1565 iscsilun->nop_timer = aio_timer_new(iscsilun->aio_context,
1566 QEMU_CLOCK_REALTIME, SCALE_MS,
1567 iscsi_nop_timed_event, iscsilun);
1568 timer_mod(iscsilun->nop_timer,
1569 qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + NOP_INTERVAL);
1570
1571 /* Set up a timer for periodic calls to iscsi_set_events and to
1572 * scan for command timeout */
1573 iscsilun->event_timer = aio_timer_new(iscsilun->aio_context,
1574 QEMU_CLOCK_REALTIME, SCALE_MS,
1575 iscsi_timed_check_events, iscsilun);
1576 timer_mod(iscsilun->event_timer,
1577 qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + EVENT_INTERVAL);
1578 }
1579
1580 static void iscsi_modesense_sync(IscsiLun *iscsilun)
1581 {
1582 struct scsi_task *task;
1583 struct scsi_mode_sense *ms = NULL;
1584 iscsilun->write_protected = false;
1585 iscsilun->dpofua = false;
1586
1587 task = iscsi_modesense6_sync(iscsilun->iscsi, iscsilun->lun,
1588 1, SCSI_MODESENSE_PC_CURRENT,
1589 0x3F, 0, 255);
1590 if (task == NULL) {
1591 error_report("iSCSI: Failed to send MODE_SENSE(6) command: %s",
1592 iscsi_get_error(iscsilun->iscsi));
1593 goto out;
1594 }
1595
1596 if (task->status != SCSI_STATUS_GOOD) {
1597 error_report("iSCSI: Failed MODE_SENSE(6), LUN assumed writable");
1598 goto out;
1599 }
1600 ms = scsi_datain_unmarshall(task);
1601 if (!ms) {
1602 error_report("iSCSI: Failed to unmarshall MODE_SENSE(6) data: %s",
1603 iscsi_get_error(iscsilun->iscsi));
1604 goto out;
1605 }
1606 iscsilun->write_protected = ms->device_specific_parameter & 0x80;
1607 iscsilun->dpofua = ms->device_specific_parameter & 0x10;
1608
1609 out:
1610 if (task) {
1611 scsi_free_scsi_task(task);
1612 }
1613 }
1614
1615 static void iscsi_parse_iscsi_option(const char *target, QDict *options)
1616 {
1617 QemuOptsList *list;
1618 QemuOpts *opts;
1619 const char *user, *password, *password_secret, *initiator_name,
1620 *header_digest, *timeout;
1621
1622 list = qemu_find_opts("iscsi");
1623 if (!list) {
1624 return;
1625 }
1626
1627 opts = qemu_opts_find(list, target);
1628 if (opts == NULL) {
1629 opts = QTAILQ_FIRST(&list->head);
1630 if (!opts) {
1631 return;
1632 }
1633 }
1634
1635 user = qemu_opt_get(opts, "user");
1636 if (user) {
1637 qdict_set_default_str(options, "user", user);
1638 }
1639
1640 password = qemu_opt_get(opts, "password");
1641 if (password) {
1642 qdict_set_default_str(options, "password", password);
1643 }
1644
1645 password_secret = qemu_opt_get(opts, "password-secret");
1646 if (password_secret) {
1647 qdict_set_default_str(options, "password-secret", password_secret);
1648 }
1649
1650 initiator_name = qemu_opt_get(opts, "initiator-name");
1651 if (initiator_name) {
1652 qdict_set_default_str(options, "initiator-name", initiator_name);
1653 }
1654
1655 header_digest = qemu_opt_get(opts, "header-digest");
1656 if (header_digest) {
1657 /* -iscsi takes upper case values, but QAPI only supports lower case
1658 * enum constant names, so we have to convert here. */
1659 char *qapi_value = g_ascii_strdown(header_digest, -1);
1660 qdict_set_default_str(options, "header-digest", qapi_value);
1661 g_free(qapi_value);
1662 }
1663
1664 timeout = qemu_opt_get(opts, "timeout");
1665 if (timeout) {
1666 qdict_set_default_str(options, "timeout", timeout);
1667 }
1668 }
1669
1670 /*
1671 * We support iscsi url's on the form
1672 * iscsi://[<username>%<password>@]<host>[:<port>]/<targetname>/<lun>
1673 */
1674 static void iscsi_parse_filename(const char *filename, QDict *options,
1675 Error **errp)
1676 {
1677 struct iscsi_url *iscsi_url;
1678 const char *transport_name;
1679 char *lun_str;
1680
1681 iscsi_url = iscsi_parse_full_url(NULL, filename);
1682 if (iscsi_url == NULL) {
1683 error_setg(errp, "Failed to parse URL : %s", filename);
1684 return;
1685 }
1686
1687 #if LIBISCSI_API_VERSION >= (20160603)
1688 switch (iscsi_url->transport) {
1689 case TCP_TRANSPORT:
1690 transport_name = "tcp";
1691 break;
1692 case ISER_TRANSPORT:
1693 transport_name = "iser";
1694 break;
1695 default:
1696 error_setg(errp, "Unknown transport type (%d)",
1697 iscsi_url->transport);
1698 return;
1699 }
1700 #else
1701 transport_name = "tcp";
1702 #endif
1703
1704 qdict_set_default_str(options, "transport", transport_name);
1705 qdict_set_default_str(options, "portal", iscsi_url->portal);
1706 qdict_set_default_str(options, "target", iscsi_url->target);
1707
1708 lun_str = g_strdup_printf("%d", iscsi_url->lun);
1709 qdict_set_default_str(options, "lun", lun_str);
1710 g_free(lun_str);
1711
1712 /* User/password from -iscsi take precedence over those from the URL */
1713 iscsi_parse_iscsi_option(iscsi_url->target, options);
1714
1715 if (iscsi_url->user[0] != '\0') {
1716 qdict_set_default_str(options, "user", iscsi_url->user);
1717 qdict_set_default_str(options, "password", iscsi_url->passwd);
1718 }
1719
1720 iscsi_destroy_url(iscsi_url);
1721 }
1722
1723 static QemuOptsList runtime_opts = {
1724 .name = "iscsi",
1725 .head = QTAILQ_HEAD_INITIALIZER(runtime_opts.head),
1726 .desc = {
1727 {
1728 .name = "transport",
1729 .type = QEMU_OPT_STRING,
1730 },
1731 {
1732 .name = "portal",
1733 .type = QEMU_OPT_STRING,
1734 },
1735 {
1736 .name = "target",
1737 .type = QEMU_OPT_STRING,
1738 },
1739 {
1740 .name = "user",
1741 .type = QEMU_OPT_STRING,
1742 },
1743 {
1744 .name = "password",
1745 .type = QEMU_OPT_STRING,
1746 },
1747 {
1748 .name = "password-secret",
1749 .type = QEMU_OPT_STRING,
1750 },
1751 {
1752 .name = "lun",
1753 .type = QEMU_OPT_NUMBER,
1754 },
1755 {
1756 .name = "initiator-name",
1757 .type = QEMU_OPT_STRING,
1758 },
1759 {
1760 .name = "header-digest",
1761 .type = QEMU_OPT_STRING,
1762 },
1763 {
1764 .name = "timeout",
1765 .type = QEMU_OPT_NUMBER,
1766 },
1767 { /* end of list */ }
1768 },
1769 };
1770
1771 static void iscsi_save_designator(IscsiLun *lun,
1772 struct scsi_inquiry_device_identification *inq_di)
1773 {
1774 struct scsi_inquiry_device_designator *desig, *copy = NULL;
1775
1776 for (desig = inq_di->designators; desig; desig = desig->next) {
1777 if (desig->association ||
1778 desig->designator_type > SCSI_DESIGNATOR_TYPE_NAA) {
1779 continue;
1780 }
1781 /* NAA works better than T10 vendor ID based designator. */
1782 if (!copy || copy->designator_type < desig->designator_type) {
1783 copy = desig;
1784 }
1785 }
1786 if (copy) {
1787 lun->dd = g_new(struct scsi_inquiry_device_designator, 1);
1788 *lun->dd = *copy;
1789 lun->dd->next = NULL;
1790 lun->dd->designator = g_malloc(copy->designator_length);
1791 memcpy(lun->dd->designator, copy->designator, copy->designator_length);
1792 }
1793 }
1794
1795 static int iscsi_open(BlockDriverState *bs, QDict *options, int flags,
1796 Error **errp)
1797 {
1798 IscsiLun *iscsilun = bs->opaque;
1799 struct iscsi_context *iscsi = NULL;
1800 struct scsi_task *task = NULL;
1801 struct scsi_inquiry_standard *inq = NULL;
1802 struct scsi_inquiry_supported_pages *inq_vpd;
1803 char *initiator_name = NULL;
1804 QemuOpts *opts;
1805 Error *local_err = NULL;
1806 const char *transport_name, *portal, *target;
1807 #if LIBISCSI_API_VERSION >= (20160603)
1808 enum iscsi_transport_type transport;
1809 #endif
1810 int i, ret = 0, timeout = 0, lun;
1811
1812 opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort);
1813 if (!qemu_opts_absorb_qdict(opts, options, errp)) {
1814 ret = -EINVAL;
1815 goto out;
1816 }
1817
1818 transport_name = qemu_opt_get(opts, "transport");
1819 portal = qemu_opt_get(opts, "portal");
1820 target = qemu_opt_get(opts, "target");
1821 lun = qemu_opt_get_number(opts, "lun", 0);
1822
1823 if (!transport_name || !portal || !target) {
1824 error_setg(errp, "Need all of transport, portal and target options");
1825 ret = -EINVAL;
1826 goto out;
1827 }
1828
1829 if (!strcmp(transport_name, "tcp")) {
1830 #if LIBISCSI_API_VERSION >= (20160603)
1831 transport = TCP_TRANSPORT;
1832 } else if (!strcmp(transport_name, "iser")) {
1833 transport = ISER_TRANSPORT;
1834 #else
1835 /* TCP is what older libiscsi versions always use */
1836 #endif
1837 } else {
1838 error_setg(errp, "Unknown transport: %s", transport_name);
1839 ret = -EINVAL;
1840 goto out;
1841 }
1842
1843 memset(iscsilun, 0, sizeof(IscsiLun));
1844
1845 initiator_name = get_initiator_name(opts);
1846
1847 iscsi = iscsi_create_context(initiator_name);
1848 if (iscsi == NULL) {
1849 error_setg(errp, "iSCSI: Failed to create iSCSI context.");
1850 ret = -ENOMEM;
1851 goto out;
1852 }
1853 #if LIBISCSI_API_VERSION >= (20160603)
1854 if (iscsi_init_transport(iscsi, transport)) {
1855 error_setg(errp, ("Error initializing transport."));
1856 ret = -EINVAL;
1857 goto out;
1858 }
1859 #endif
1860 if (iscsi_set_targetname(iscsi, target)) {
1861 error_setg(errp, "iSCSI: Failed to set target name.");
1862 ret = -EINVAL;
1863 goto out;
1864 }
1865
1866 /* check if we got CHAP username/password via the options */
1867 apply_chap(iscsi, opts, &local_err);
1868 if (local_err != NULL) {
1869 error_propagate(errp, local_err);
1870 ret = -EINVAL;
1871 goto out;
1872 }
1873
1874 if (iscsi_set_session_type(iscsi, ISCSI_SESSION_NORMAL) != 0) {
1875 error_setg(errp, "iSCSI: Failed to set session type to normal.");
1876 ret = -EINVAL;
1877 goto out;
1878 }
1879
1880 /* check if we got HEADER_DIGEST via the options */
1881 apply_header_digest(iscsi, opts, &local_err);
1882 if (local_err != NULL) {
1883 error_propagate(errp, local_err);
1884 ret = -EINVAL;
1885 goto out;
1886 }
1887
1888 /* timeout handling is broken in libiscsi before 1.15.0 */
1889 timeout = qemu_opt_get_number(opts, "timeout", 0);
1890 #if LIBISCSI_API_VERSION >= 20150621
1891 iscsi_set_timeout(iscsi, timeout);
1892 #else
1893 if (timeout) {
1894 warn_report("iSCSI: ignoring timeout value for libiscsi <1.15.0");
1895 }
1896 #endif
1897
1898 if (iscsi_full_connect_sync(iscsi, portal, lun) != 0) {
1899 error_setg(errp, "iSCSI: Failed to connect to LUN : %s",
1900 iscsi_get_error(iscsi));
1901 ret = -EINVAL;
1902 goto out;
1903 }
1904
1905 iscsilun->iscsi = iscsi;
1906 iscsilun->aio_context = bdrv_get_aio_context(bs);
1907 iscsilun->lun = lun;
1908 iscsilun->has_write_same = true;
1909
1910 task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 0, 0,
1911 (void **) &inq, errp);
1912 if (task == NULL) {
1913 ret = -EINVAL;
1914 goto out;
1915 }
1916 iscsilun->type = inq->periperal_device_type;
1917 scsi_free_scsi_task(task);
1918 task = NULL;
1919
1920 iscsi_modesense_sync(iscsilun);
1921 if (iscsilun->dpofua) {
1922 bs->supported_write_flags = BDRV_REQ_FUA;
1923 }
1924
1925 /* Check the write protect flag of the LUN if we want to write */
1926 if (iscsilun->type == TYPE_DISK && (flags & BDRV_O_RDWR) &&
1927 iscsilun->write_protected) {
1928 bdrv_graph_rdlock_main_loop();
1929 ret = bdrv_apply_auto_read_only(bs, "LUN is write protected", errp);
1930 bdrv_graph_rdunlock_main_loop();
1931 if (ret < 0) {
1932 goto out;
1933 }
1934 flags &= ~BDRV_O_RDWR;
1935 }
1936
1937 iscsi_readcapacity_sync(iscsilun, &local_err);
1938 if (local_err != NULL) {
1939 error_propagate(errp, local_err);
1940 ret = -EINVAL;
1941 goto out;
1942 }
1943 bs->total_sectors = sector_lun2qemu(iscsilun->num_blocks, iscsilun);
1944
1945 /* We don't have any emulation for devices other than disks and CD-ROMs, so
1946 * this must be sg ioctl compatible. We force it to be sg, otherwise qemu
1947 * will try to read from the device to guess the image format.
1948 */
1949 if (iscsilun->type != TYPE_DISK && iscsilun->type != TYPE_ROM) {
1950 bs->sg = true;
1951 }
1952
1953 task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1,
1954 SCSI_INQUIRY_PAGECODE_SUPPORTED_VPD_PAGES,
1955 (void **) &inq_vpd, errp);
1956 if (task == NULL) {
1957 ret = -EINVAL;
1958 goto out;
1959 }
1960 for (i = 0; i < inq_vpd->num_pages; i++) {
1961 struct scsi_task *inq_task;
1962 struct scsi_inquiry_logical_block_provisioning *inq_lbp;
1963 struct scsi_inquiry_block_limits *inq_bl;
1964 struct scsi_inquiry_device_identification *inq_di;
1965 switch (inq_vpd->pages[i]) {
1966 case SCSI_INQUIRY_PAGECODE_LOGICAL_BLOCK_PROVISIONING:
1967 inq_task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1,
1968 SCSI_INQUIRY_PAGECODE_LOGICAL_BLOCK_PROVISIONING,
1969 (void **) &inq_lbp, errp);
1970 if (inq_task == NULL) {
1971 ret = -EINVAL;
1972 goto out;
1973 }
1974 memcpy(&iscsilun->lbp, inq_lbp,
1975 sizeof(struct scsi_inquiry_logical_block_provisioning));
1976 scsi_free_scsi_task(inq_task);
1977 break;
1978 case SCSI_INQUIRY_PAGECODE_BLOCK_LIMITS:
1979 inq_task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1,
1980 SCSI_INQUIRY_PAGECODE_BLOCK_LIMITS,
1981 (void **) &inq_bl, errp);
1982 if (inq_task == NULL) {
1983 ret = -EINVAL;
1984 goto out;
1985 }
1986 memcpy(&iscsilun->bl, inq_bl,
1987 sizeof(struct scsi_inquiry_block_limits));
1988 scsi_free_scsi_task(inq_task);
1989 break;
1990 case SCSI_INQUIRY_PAGECODE_DEVICE_IDENTIFICATION:
1991 inq_task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1,
1992 SCSI_INQUIRY_PAGECODE_DEVICE_IDENTIFICATION,
1993 (void **) &inq_di, errp);
1994 if (inq_task == NULL) {
1995 ret = -EINVAL;
1996 goto out;
1997 }
1998 iscsi_save_designator(iscsilun, inq_di);
1999 scsi_free_scsi_task(inq_task);
2000 break;
2001 default:
2002 break;
2003 }
2004 }
2005 scsi_free_scsi_task(task);
2006 task = NULL;
2007
2008 qemu_mutex_init(&iscsilun->mutex);
2009 iscsi_attach_aio_context(bs, iscsilun->aio_context);
2010
2011 /* Guess the internal cluster (page) size of the iscsi target by the means
2012 * of opt_unmap_gran. Transfer the unmap granularity only if it has a
2013 * reasonable size */
2014 if (iscsilun->bl.opt_unmap_gran * iscsilun->block_size >= 4 * 1024 &&
2015 iscsilun->bl.opt_unmap_gran * iscsilun->block_size <= 16 * 1024 * 1024) {
2016 iscsilun->cluster_size = iscsilun->bl.opt_unmap_gran *
2017 iscsilun->block_size;
2018 if (iscsilun->lbprz) {
2019 ret = iscsi_allocmap_init(iscsilun, flags);
2020 }
2021 }
2022
2023 if (iscsilun->lbprz && iscsilun->lbp.lbpws) {
2024 bs->supported_zero_flags = BDRV_REQ_MAY_UNMAP;
2025 }
2026
2027 out:
2028 qemu_opts_del(opts);
2029 g_free(initiator_name);
2030 if (task != NULL) {
2031 scsi_free_scsi_task(task);
2032 }
2033
2034 if (ret) {
2035 if (iscsi != NULL) {
2036 if (iscsi_is_logged_in(iscsi)) {
2037 iscsi_logout_sync(iscsi);
2038 }
2039 iscsi_destroy_context(iscsi);
2040 }
2041 memset(iscsilun, 0, sizeof(IscsiLun));
2042 }
2043
2044 return ret;
2045 }
2046
2047 static void iscsi_close(BlockDriverState *bs)
2048 {
2049 IscsiLun *iscsilun = bs->opaque;
2050 struct iscsi_context *iscsi = iscsilun->iscsi;
2051
2052 iscsi_detach_aio_context(bs);
2053 if (iscsi_is_logged_in(iscsi)) {
2054 iscsi_logout_sync(iscsi);
2055 }
2056 iscsi_destroy_context(iscsi);
2057 if (iscsilun->dd) {
2058 g_free(iscsilun->dd->designator);
2059 g_free(iscsilun->dd);
2060 }
2061 g_free(iscsilun->zeroblock);
2062 iscsi_allocmap_free(iscsilun);
2063 qemu_mutex_destroy(&iscsilun->mutex);
2064 memset(iscsilun, 0, sizeof(IscsiLun));
2065 }
2066
2067 static void iscsi_refresh_limits(BlockDriverState *bs, Error **errp)
2068 {
2069 /* We don't actually refresh here, but just return data queried in
2070 * iscsi_open(): iscsi targets don't change their limits. */
2071
2072 IscsiLun *iscsilun = bs->opaque;
2073 uint64_t max_xfer_len = iscsilun->use_16_for_rw ? 0xffffffff : 0xffff;
2074 unsigned int block_size = MAX(BDRV_SECTOR_SIZE, iscsilun->block_size);
2075
2076 assert(iscsilun->block_size >= BDRV_SECTOR_SIZE || bdrv_is_sg(bs));
2077
2078 bs->bl.request_alignment = block_size;
2079
2080 if (iscsilun->bl.max_xfer_len) {
2081 max_xfer_len = MIN(max_xfer_len, iscsilun->bl.max_xfer_len);
2082 }
2083
2084 if (max_xfer_len * block_size < INT_MAX) {
2085 bs->bl.max_transfer = max_xfer_len * iscsilun->block_size;
2086 }
2087
2088 if (iscsilun->lbp.lbpu) {
2089 bs->bl.max_pdiscard =
2090 MIN_NON_ZERO(iscsilun->bl.max_unmap * iscsilun->block_size,
2091 (uint64_t)UINT32_MAX * iscsilun->block_size);
2092 bs->bl.pdiscard_alignment =
2093 iscsilun->bl.opt_unmap_gran * iscsilun->block_size;
2094 } else {
2095 bs->bl.pdiscard_alignment = iscsilun->block_size;
2096 }
2097
2098 bs->bl.max_pwrite_zeroes =
2099 MIN_NON_ZERO(iscsilun->bl.max_ws_len * iscsilun->block_size,
2100 max_xfer_len * iscsilun->block_size);
2101
2102 if (iscsilun->lbp.lbpws) {
2103 bs->bl.pwrite_zeroes_alignment =
2104 iscsilun->bl.opt_unmap_gran * iscsilun->block_size;
2105 } else {
2106 bs->bl.pwrite_zeroes_alignment = iscsilun->block_size;
2107 }
2108 if (iscsilun->bl.opt_xfer_len &&
2109 iscsilun->bl.opt_xfer_len < INT_MAX / block_size) {
2110 bs->bl.opt_transfer = pow2floor(iscsilun->bl.opt_xfer_len *
2111 iscsilun->block_size);
2112 }
2113 }
2114
2115 /* Note that this will not re-establish a connection with an iSCSI target - it
2116 * is effectively a NOP. */
2117 static int iscsi_reopen_prepare(BDRVReopenState *state,
2118 BlockReopenQueue *queue, Error **errp)
2119 {
2120 IscsiLun *iscsilun = state->bs->opaque;
2121
2122 if (state->flags & BDRV_O_RDWR && iscsilun->write_protected) {
2123 error_setg(errp, "Cannot open a write protected LUN as read-write");
2124 return -EACCES;
2125 }
2126 return 0;
2127 }
2128
2129 static void iscsi_reopen_commit(BDRVReopenState *reopen_state)
2130 {
2131 IscsiLun *iscsilun = reopen_state->bs->opaque;
2132
2133 /* the cache.direct status might have changed */
2134 if (iscsilun->allocmap != NULL) {
2135 iscsi_allocmap_init(iscsilun, reopen_state->flags);
2136 }
2137 }
2138
2139 static int coroutine_fn iscsi_co_truncate(BlockDriverState *bs, int64_t offset,
2140 bool exact, PreallocMode prealloc,
2141 BdrvRequestFlags flags, Error **errp)
2142 {
2143 IscsiLun *iscsilun = bs->opaque;
2144 int64_t cur_length;
2145 Error *local_err = NULL;
2146
2147 if (prealloc != PREALLOC_MODE_OFF) {
2148 error_setg(errp, "Unsupported preallocation mode '%s'",
2149 PreallocMode_str(prealloc));
2150 return -ENOTSUP;
2151 }
2152
2153 if (iscsilun->type != TYPE_DISK) {
2154 error_setg(errp, "Cannot resize non-disk iSCSI devices");
2155 return -ENOTSUP;
2156 }
2157
2158 iscsi_readcapacity_sync(iscsilun, &local_err);
2159 if (local_err != NULL) {
2160 error_propagate(errp, local_err);
2161 return -EIO;
2162 }
2163
2164 cur_length = iscsi_co_getlength(bs);
2165 if (offset != cur_length && exact) {
2166 error_setg(errp, "Cannot resize iSCSI devices");
2167 return -ENOTSUP;
2168 } else if (offset > cur_length) {
2169 error_setg(errp, "Cannot grow iSCSI devices");
2170 return -EINVAL;
2171 }
2172
2173 if (iscsilun->allocmap != NULL) {
2174 iscsi_allocmap_init(iscsilun, bs->open_flags);
2175 }
2176
2177 return 0;
2178 }
2179
2180 static int coroutine_fn
2181 iscsi_co_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
2182 {
2183 IscsiLun *iscsilun = bs->opaque;
2184 bdi->cluster_size = iscsilun->cluster_size;
2185 return 0;
2186 }
2187
2188 static void coroutine_fn iscsi_co_invalidate_cache(BlockDriverState *bs,
2189 Error **errp)
2190 {
2191 IscsiLun *iscsilun = bs->opaque;
2192 iscsi_allocmap_invalidate(iscsilun);
2193 }
2194
2195 static int coroutine_fn GRAPH_RDLOCK
2196 iscsi_co_copy_range_from(BlockDriverState *bs,
2197 BdrvChild *src, int64_t src_offset,
2198 BdrvChild *dst, int64_t dst_offset,
2199 int64_t bytes, BdrvRequestFlags read_flags,
2200 BdrvRequestFlags write_flags)
2201 {
2202 return bdrv_co_copy_range_to(src, src_offset, dst, dst_offset, bytes,
2203 read_flags, write_flags);
2204 }
2205
2206 static struct scsi_task *iscsi_xcopy_task(int param_len)
2207 {
2208 struct scsi_task *task;
2209
2210 task = g_new0(struct scsi_task, 1);
2211
2212 task->cdb[0] = EXTENDED_COPY;
2213 task->cdb[10] = (param_len >> 24) & 0xFF;
2214 task->cdb[11] = (param_len >> 16) & 0xFF;
2215 task->cdb[12] = (param_len >> 8) & 0xFF;
2216 task->cdb[13] = param_len & 0xFF;
2217 task->cdb_size = 16;
2218 task->xfer_dir = SCSI_XFER_WRITE;
2219 task->expxferlen = param_len;
2220
2221 return task;
2222 }
2223
2224 static void iscsi_populate_target_desc(unsigned char *desc, IscsiLun *lun)
2225 {
2226 struct scsi_inquiry_device_designator *dd = lun->dd;
2227
2228 memset(desc, 0, 32);
2229 desc[0] = 0xE4; /* IDENT_DESCR_TGT_DESCR */
2230 desc[4] = dd->code_set;
2231 desc[5] = (dd->designator_type & 0xF)
2232 | ((dd->association & 3) << 4);
2233 desc[7] = dd->designator_length;
2234 memcpy(desc + 8, dd->designator, MIN(dd->designator_length, 20));
2235
2236 desc[28] = 0;
2237 desc[29] = (lun->block_size >> 16) & 0xFF;
2238 desc[30] = (lun->block_size >> 8) & 0xFF;
2239 desc[31] = lun->block_size & 0xFF;
2240 }
2241
2242 static void iscsi_xcopy_desc_hdr(uint8_t *hdr, int dc, int cat, int src_index,
2243 int dst_index)
2244 {
2245 hdr[0] = 0x02; /* BLK_TO_BLK_SEG_DESCR */
2246 hdr[1] = ((dc << 1) | cat) & 0xFF;
2247 hdr[2] = (XCOPY_BLK2BLK_SEG_DESC_SIZE >> 8) & 0xFF;
2248 /* don't account for the first 4 bytes in descriptor header*/
2249 hdr[3] = (XCOPY_BLK2BLK_SEG_DESC_SIZE - 4 /* SEG_DESC_SRC_INDEX_OFFSET */) & 0xFF;
2250 hdr[4] = (src_index >> 8) & 0xFF;
2251 hdr[5] = src_index & 0xFF;
2252 hdr[6] = (dst_index >> 8) & 0xFF;
2253 hdr[7] = dst_index & 0xFF;
2254 }
2255
2256 static void iscsi_xcopy_populate_desc(uint8_t *desc, int dc, int cat,
2257 int src_index, int dst_index, int num_blks,
2258 uint64_t src_lba, uint64_t dst_lba)
2259 {
2260 iscsi_xcopy_desc_hdr(desc, dc, cat, src_index, dst_index);
2261
2262 /* The caller should verify the request size */
2263 assert(num_blks < 65536);
2264 desc[10] = (num_blks >> 8) & 0xFF;
2265 desc[11] = num_blks & 0xFF;
2266 desc[12] = (src_lba >> 56) & 0xFF;
2267 desc[13] = (src_lba >> 48) & 0xFF;
2268 desc[14] = (src_lba >> 40) & 0xFF;
2269 desc[15] = (src_lba >> 32) & 0xFF;
2270 desc[16] = (src_lba >> 24) & 0xFF;
2271 desc[17] = (src_lba >> 16) & 0xFF;
2272 desc[18] = (src_lba >> 8) & 0xFF;
2273 desc[19] = src_lba & 0xFF;
2274 desc[20] = (dst_lba >> 56) & 0xFF;
2275 desc[21] = (dst_lba >> 48) & 0xFF;
2276 desc[22] = (dst_lba >> 40) & 0xFF;
2277 desc[23] = (dst_lba >> 32) & 0xFF;
2278 desc[24] = (dst_lba >> 24) & 0xFF;
2279 desc[25] = (dst_lba >> 16) & 0xFF;
2280 desc[26] = (dst_lba >> 8) & 0xFF;
2281 desc[27] = dst_lba & 0xFF;
2282 }
2283
2284 static void iscsi_xcopy_populate_header(unsigned char *buf, int list_id, int str,
2285 int list_id_usage, int prio,
2286 int tgt_desc_len,
2287 int seg_desc_len, int inline_data_len)
2288 {
2289 buf[0] = list_id;
2290 buf[1] = ((str & 1) << 5) | ((list_id_usage & 3) << 3) | (prio & 7);
2291 buf[2] = (tgt_desc_len >> 8) & 0xFF;
2292 buf[3] = tgt_desc_len & 0xFF;
2293 buf[8] = (seg_desc_len >> 24) & 0xFF;
2294 buf[9] = (seg_desc_len >> 16) & 0xFF;
2295 buf[10] = (seg_desc_len >> 8) & 0xFF;
2296 buf[11] = seg_desc_len & 0xFF;
2297 buf[12] = (inline_data_len >> 24) & 0xFF;
2298 buf[13] = (inline_data_len >> 16) & 0xFF;
2299 buf[14] = (inline_data_len >> 8) & 0xFF;
2300 buf[15] = inline_data_len & 0xFF;
2301 }
2302
2303 static void iscsi_xcopy_data(struct iscsi_data *data,
2304 IscsiLun *src, int64_t src_lba,
2305 IscsiLun *dst, int64_t dst_lba,
2306 uint16_t num_blocks)
2307 {
2308 uint8_t *buf;
2309 const int src_offset = XCOPY_DESC_OFFSET;
2310 const int dst_offset = XCOPY_DESC_OFFSET + IDENT_DESCR_TGT_DESCR_SIZE;
2311 const int seg_offset = dst_offset + IDENT_DESCR_TGT_DESCR_SIZE;
2312
2313 data->size = XCOPY_DESC_OFFSET +
2314 IDENT_DESCR_TGT_DESCR_SIZE * 2 +
2315 XCOPY_BLK2BLK_SEG_DESC_SIZE;
2316 data->data = g_malloc0(data->size);
2317 buf = data->data;
2318
2319 /* Initialise the parameter list header */
2320 iscsi_xcopy_populate_header(buf, 1, 0, 2 /* LIST_ID_USAGE_DISCARD */,
2321 0, 2 * IDENT_DESCR_TGT_DESCR_SIZE,
2322 XCOPY_BLK2BLK_SEG_DESC_SIZE,
2323 0);
2324
2325 /* Initialise CSCD list with one src + one dst descriptor */
2326 iscsi_populate_target_desc(&buf[src_offset], src);
2327 iscsi_populate_target_desc(&buf[dst_offset], dst);
2328
2329 /* Initialise one segment descriptor */
2330 iscsi_xcopy_populate_desc(&buf[seg_offset], 0, 0, 0, 1, num_blocks,
2331 src_lba, dst_lba);
2332 }
2333
2334 static int coroutine_fn GRAPH_RDLOCK
2335 iscsi_co_copy_range_to(BlockDriverState *bs,
2336 BdrvChild *src, int64_t src_offset,
2337 BdrvChild *dst, int64_t dst_offset,
2338 int64_t bytes, BdrvRequestFlags read_flags,
2339 BdrvRequestFlags write_flags)
2340 {
2341 IscsiLun *dst_lun = dst->bs->opaque;
2342 IscsiLun *src_lun;
2343 struct IscsiTask iscsi_task;
2344 struct iscsi_data data;
2345 int r = 0;
2346 int block_size;
2347
2348 if (src->bs->drv->bdrv_co_copy_range_to != iscsi_co_copy_range_to) {
2349 return -ENOTSUP;
2350 }
2351 src_lun = src->bs->opaque;
2352
2353 if (!src_lun->dd || !dst_lun->dd) {
2354 return -ENOTSUP;
2355 }
2356 if (!is_byte_request_lun_aligned(dst_offset, bytes, dst_lun)) {
2357 return -ENOTSUP;
2358 }
2359 if (!is_byte_request_lun_aligned(src_offset, bytes, src_lun)) {
2360 return -ENOTSUP;
2361 }
2362 if (dst_lun->block_size != src_lun->block_size ||
2363 !dst_lun->block_size) {
2364 return -ENOTSUP;
2365 }
2366
2367 block_size = dst_lun->block_size;
2368 if (bytes / block_size > 65535) {
2369 return -ENOTSUP;
2370 }
2371
2372 iscsi_xcopy_data(&data,
2373 src_lun, src_offset / block_size,
2374 dst_lun, dst_offset / block_size,
2375 bytes / block_size);
2376
2377 iscsi_co_init_iscsitask(dst_lun, &iscsi_task);
2378
2379 qemu_mutex_lock(&dst_lun->mutex);
2380 iscsi_task.task = iscsi_xcopy_task(data.size);
2381 retry:
2382 if (iscsi_scsi_command_async(dst_lun->iscsi, dst_lun->lun,
2383 iscsi_task.task, iscsi_co_generic_cb,
2384 &data,
2385 &iscsi_task) != 0) {
2386 r = -EIO;
2387 goto out_unlock;
2388 }
2389
2390 iscsi_co_wait_for_task(&iscsi_task, dst_lun);
2391
2392 if (iscsi_task.do_retry) {
2393 iscsi_task.complete = 0;
2394 goto retry;
2395 }
2396
2397 if (iscsi_task.status != SCSI_STATUS_GOOD) {
2398 r = iscsi_task.err_code;
2399 goto out_unlock;
2400 }
2401
2402 out_unlock:
2403
2404 trace_iscsi_xcopy(src_lun, src_offset, dst_lun, dst_offset, bytes, r);
2405 g_free(iscsi_task.task);
2406 qemu_mutex_unlock(&dst_lun->mutex);
2407 g_free(iscsi_task.err_str);
2408 return r;
2409 }
2410
2411
2412 static const char *const iscsi_strong_runtime_opts[] = {
2413 "transport",
2414 "portal",
2415 "target",
2416 "user",
2417 "password",
2418 "password-secret",
2419 "lun",
2420 "initiator-name",
2421 "header-digest",
2422
2423 NULL
2424 };
2425
2426 static BlockDriver bdrv_iscsi = {
2427 .format_name = "iscsi",
2428 .protocol_name = "iscsi",
2429
2430 .instance_size = sizeof(IscsiLun),
2431 .bdrv_parse_filename = iscsi_parse_filename,
2432 .bdrv_file_open = iscsi_open,
2433 .bdrv_close = iscsi_close,
2434 .bdrv_co_create_opts = bdrv_co_create_opts_simple,
2435 .create_opts = &bdrv_create_opts_simple,
2436 .bdrv_reopen_prepare = iscsi_reopen_prepare,
2437 .bdrv_reopen_commit = iscsi_reopen_commit,
2438 .bdrv_co_invalidate_cache = iscsi_co_invalidate_cache,
2439
2440 .bdrv_co_getlength = iscsi_co_getlength,
2441 .bdrv_co_get_info = iscsi_co_get_info,
2442 .bdrv_co_truncate = iscsi_co_truncate,
2443 .bdrv_refresh_limits = iscsi_refresh_limits,
2444
2445 .bdrv_co_block_status = iscsi_co_block_status,
2446 .bdrv_co_pdiscard = iscsi_co_pdiscard,
2447 .bdrv_co_copy_range_from = iscsi_co_copy_range_from,
2448 .bdrv_co_copy_range_to = iscsi_co_copy_range_to,
2449 .bdrv_co_pwrite_zeroes = iscsi_co_pwrite_zeroes,
2450 .bdrv_co_readv = iscsi_co_readv,
2451 .bdrv_co_writev = iscsi_co_writev,
2452 .bdrv_co_flush_to_disk = iscsi_co_flush,
2453
2454 #ifdef __linux__
2455 .bdrv_aio_ioctl = iscsi_aio_ioctl,
2456 #endif
2457
2458 .bdrv_detach_aio_context = iscsi_detach_aio_context,
2459 .bdrv_attach_aio_context = iscsi_attach_aio_context,
2460
2461 .strong_runtime_opts = iscsi_strong_runtime_opts,
2462 };
2463
2464 #if LIBISCSI_API_VERSION >= (20160603)
2465 static BlockDriver bdrv_iser = {
2466 .format_name = "iser",
2467 .protocol_name = "iser",
2468
2469 .instance_size = sizeof(IscsiLun),
2470 .bdrv_parse_filename = iscsi_parse_filename,
2471 .bdrv_file_open = iscsi_open,
2472 .bdrv_close = iscsi_close,
2473 .bdrv_co_create_opts = bdrv_co_create_opts_simple,
2474 .create_opts = &bdrv_create_opts_simple,
2475 .bdrv_reopen_prepare = iscsi_reopen_prepare,
2476 .bdrv_reopen_commit = iscsi_reopen_commit,
2477 .bdrv_co_invalidate_cache = iscsi_co_invalidate_cache,
2478
2479 .bdrv_co_getlength = iscsi_co_getlength,
2480 .bdrv_co_get_info = iscsi_co_get_info,
2481 .bdrv_co_truncate = iscsi_co_truncate,
2482 .bdrv_refresh_limits = iscsi_refresh_limits,
2483
2484 .bdrv_co_block_status = iscsi_co_block_status,
2485 .bdrv_co_pdiscard = iscsi_co_pdiscard,
2486 .bdrv_co_copy_range_from = iscsi_co_copy_range_from,
2487 .bdrv_co_copy_range_to = iscsi_co_copy_range_to,
2488 .bdrv_co_pwrite_zeroes = iscsi_co_pwrite_zeroes,
2489 .bdrv_co_readv = iscsi_co_readv,
2490 .bdrv_co_writev = iscsi_co_writev,
2491 .bdrv_co_flush_to_disk = iscsi_co_flush,
2492
2493 #ifdef __linux__
2494 .bdrv_aio_ioctl = iscsi_aio_ioctl,
2495 #endif
2496
2497 .bdrv_detach_aio_context = iscsi_detach_aio_context,
2498 .bdrv_attach_aio_context = iscsi_attach_aio_context,
2499
2500 .strong_runtime_opts = iscsi_strong_runtime_opts,
2501 };
2502 #endif
2503
2504 static void iscsi_block_init(void)
2505 {
2506 bdrv_register(&bdrv_iscsi);
2507 #if LIBISCSI_API_VERSION >= (20160603)
2508 bdrv_register(&bdrv_iser);
2509 #endif
2510 }
2511
2512 block_init(iscsi_block_init);
armbru's QEMU hackery