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s390x/kvm: factor out storing of CPU status
[qemu.git] / block / iscsi.c
blob4683f3b244ee4fd2b56426780e97291295d28653
1 /*
2 * QEMU Block driver for iSCSI images
3 *
4 * Copyright (c) 2010-2011 Ronnie Sahlberg <ronniesahlberg@gmail.com>
5 * Copyright (c) 2012-2016 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 "scsi/constants.h"
38 #include "qemu/iov.h"
39 #include "qemu/uuid.h"
40 #include "qmp-commands.h"
41 #include "qapi/qmp/qstring.h"
42 #include "crypto/secret.h"
43 #include "scsi/utils.h"
44
45 /* Conflict between scsi/utils.h and libiscsi! :( */
46 #define SCSI_XFER_NONE ISCSI_XFER_NONE
47 #include <iscsi/iscsi.h>
48 #include <iscsi/scsi-lowlevel.h>
49 #undef SCSI_XFER_NONE
50 QEMU_BUILD_BUG_ON((int)SCSI_XFER_NONE != (int)ISCSI_XFER_NONE);
51
52 #ifdef __linux__
53 #include <scsi/sg.h>
54 #endif
55
56 typedef struct IscsiLun {
57 struct iscsi_context *iscsi;
58 AioContext *aio_context;
59 int lun;
60 enum scsi_inquiry_peripheral_device_type type;
61 int block_size;
62 uint64_t num_blocks;
63 int events;
64 QEMUTimer *nop_timer;
65 QEMUTimer *event_timer;
66 QemuMutex mutex;
67 struct scsi_inquiry_logical_block_provisioning lbp;
68 struct scsi_inquiry_block_limits bl;
69 unsigned char *zeroblock;
70 /* The allocmap tracks which clusters (pages) on the iSCSI target are
71 * allocated and which are not. In case a target returns zeros for
72 * unallocated pages (iscsilun->lprz) we can directly return zeros instead
73 * of reading zeros over the wire if a read request falls within an
74 * unallocated block. As there are 3 possible states we need 2 bitmaps to
75 * track. allocmap_valid keeps track if QEMU's information about a page is
76 * valid. allocmap tracks if a page is allocated or not. In case QEMU has no
77 * valid information about a page the corresponding allocmap entry should be
78 * switched to unallocated as well to force a new lookup of the allocation
79 * status as lookups are generally skipped if a page is suspect to be
80 * allocated. If a iSCSI target is opened with cache.direct = on the
81 * allocmap_valid does not exist turning all cached information invalid so
82 * that a fresh lookup is made for any page even if allocmap entry returns
83 * it's unallocated. */
84 unsigned long *allocmap;
85 unsigned long *allocmap_valid;
86 long allocmap_size;
87 int cluster_sectors;
88 bool use_16_for_rw;
89 bool write_protected;
90 bool lbpme;
91 bool lbprz;
92 bool dpofua;
93 bool has_write_same;
94 bool request_timed_out;
95 } IscsiLun;
96
97 typedef struct IscsiTask {
98 int status;
99 int complete;
100 int retries;
101 int do_retry;
102 struct scsi_task *task;
103 Coroutine *co;
104 IscsiLun *iscsilun;
105 QEMUTimer retry_timer;
106 int err_code;
107 } IscsiTask;
108
109 typedef struct IscsiAIOCB {
110 BlockAIOCB common;
111 QEMUBH *bh;
112 IscsiLun *iscsilun;
113 struct scsi_task *task;
114 uint8_t *buf;
115 int status;
116 int64_t sector_num;
117 int nb_sectors;
118 int ret;
119 #ifdef __linux__
120 sg_io_hdr_t *ioh;
121 #endif
122 } IscsiAIOCB;
123
124 /* libiscsi uses time_t so its enough to process events every second */
125 #define EVENT_INTERVAL 1000
126 #define NOP_INTERVAL 5000
127 #define MAX_NOP_FAILURES 3
128 #define ISCSI_CMD_RETRIES ARRAY_SIZE(iscsi_retry_times)
129 static const unsigned iscsi_retry_times[] = {8, 32, 128, 512, 2048, 8192, 32768};
130
131 /* this threshold is a trade-off knob to choose between
132 * the potential additional overhead of an extra GET_LBA_STATUS request
133 * vs. unnecessarily reading a lot of zero sectors over the wire.
134 * If a read request is greater or equal than ISCSI_CHECKALLOC_THRES
135 * sectors we check the allocation status of the area covered by the
136 * request first if the allocationmap indicates that the area might be
137 * unallocated. */
138 #define ISCSI_CHECKALLOC_THRES 64
139
140 static void
141 iscsi_bh_cb(void *p)
142 {
143 IscsiAIOCB *acb = p;
144
145 qemu_bh_delete(acb->bh);
146
147 g_free(acb->buf);
148 acb->buf = NULL;
149
150 acb->common.cb(acb->common.opaque, acb->status);
151
152 if (acb->task != NULL) {
153 scsi_free_scsi_task(acb->task);
154 acb->task = NULL;
155 }
156
157 qemu_aio_unref(acb);
158 }
159
160 static void
161 iscsi_schedule_bh(IscsiAIOCB *acb)
162 {
163 if (acb->bh) {
164 return;
165 }
166 acb->bh = aio_bh_new(acb->iscsilun->aio_context, iscsi_bh_cb, acb);
167 qemu_bh_schedule(acb->bh);
168 }
169
170 static void iscsi_co_generic_bh_cb(void *opaque)
171 {
172 struct IscsiTask *iTask = opaque;
173
174 iTask->complete = 1;
175 aio_co_wake(iTask->co);
176 }
177
178 static void iscsi_retry_timer_expired(void *opaque)
179 {
180 struct IscsiTask *iTask = opaque;
181 iTask->complete = 1;
182 if (iTask->co) {
183 aio_co_wake(iTask->co);
184 }
185 }
186
187 static inline unsigned exp_random(double mean)
188 {
189 return -mean * log((double)rand() / RAND_MAX);
190 }
191
192 /* SCSI_SENSE_ASCQ_INVALID_FIELD_IN_PARAMETER_LIST was introduced in
193 * libiscsi 1.10.0, together with other constants we need. Use it as
194 * a hint that we have to define them ourselves if needed, to keep the
195 * minimum required libiscsi version at 1.9.0. We use an ASCQ macro for
196 * the test because SCSI_STATUS_* is an enum.
197 *
198 * To guard against future changes where SCSI_SENSE_ASCQ_* also becomes
199 * an enum, check against the LIBISCSI_API_VERSION macro, which was
200 * introduced in 1.11.0. If it is present, there is no need to define
201 * anything.
202 */
203 #if !defined(SCSI_SENSE_ASCQ_INVALID_FIELD_IN_PARAMETER_LIST) && \
204 !defined(LIBISCSI_API_VERSION)
205 #define SCSI_STATUS_TASK_SET_FULL 0x28
206 #define SCSI_STATUS_TIMEOUT 0x0f000002
207 #define SCSI_SENSE_ASCQ_INVALID_FIELD_IN_PARAMETER_LIST 0x2600
208 #define SCSI_SENSE_ASCQ_PARAMETER_LIST_LENGTH_ERROR 0x1a00
209 #endif
210
211 #ifndef LIBISCSI_API_VERSION
212 #define LIBISCSI_API_VERSION 20130701
213 #endif
214
215 static int iscsi_translate_sense(struct scsi_sense *sense)
216 {
217 return - scsi_sense_to_errno(sense->key,
218 (sense->ascq & 0xFF00) >> 8,
219 sense->ascq & 0xFF);
220 }
221
222 /* Called (via iscsi_service) with QemuMutex held. */
223 static void
224 iscsi_co_generic_cb(struct iscsi_context *iscsi, int status,
225 void *command_data, void *opaque)
226 {
227 struct IscsiTask *iTask = opaque;
228 struct scsi_task *task = command_data;
229
230 iTask->status = status;
231 iTask->do_retry = 0;
232 iTask->task = task;
233
234 if (status != SCSI_STATUS_GOOD) {
235 if (iTask->retries++ < ISCSI_CMD_RETRIES) {
236 if (status == SCSI_STATUS_CHECK_CONDITION
237 && task->sense.key == SCSI_SENSE_UNIT_ATTENTION) {
238 error_report("iSCSI CheckCondition: %s",
239 iscsi_get_error(iscsi));
240 iTask->do_retry = 1;
241 goto out;
242 }
243 if (status == SCSI_STATUS_BUSY ||
244 status == SCSI_STATUS_TIMEOUT ||
245 status == SCSI_STATUS_TASK_SET_FULL) {
246 unsigned retry_time =
247 exp_random(iscsi_retry_times[iTask->retries - 1]);
248 if (status == SCSI_STATUS_TIMEOUT) {
249 /* make sure the request is rescheduled AFTER the
250 * reconnect is initiated */
251 retry_time = EVENT_INTERVAL * 2;
252 iTask->iscsilun->request_timed_out = true;
253 }
254 error_report("iSCSI Busy/TaskSetFull/TimeOut"
255 " (retry #%u in %u ms): %s",
256 iTask->retries, retry_time,
257 iscsi_get_error(iscsi));
258 aio_timer_init(iTask->iscsilun->aio_context,
259 &iTask->retry_timer, QEMU_CLOCK_REALTIME,
260 SCALE_MS, iscsi_retry_timer_expired, iTask);
261 timer_mod(&iTask->retry_timer,
262 qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + retry_time);
263 iTask->do_retry = 1;
264 return;
265 }
266 }
267 iTask->err_code = iscsi_translate_sense(&task->sense);
268 error_report("iSCSI Failure: %s", iscsi_get_error(iscsi));
269 }
270
271 out:
272 if (iTask->co) {
273 aio_bh_schedule_oneshot(iTask->iscsilun->aio_context,
274 iscsi_co_generic_bh_cb, iTask);
275 } else {
276 iTask->complete = 1;
277 }
278 }
279
280 static void iscsi_co_init_iscsitask(IscsiLun *iscsilun, struct IscsiTask *iTask)
281 {
282 *iTask = (struct IscsiTask) {
283 .co = qemu_coroutine_self(),
284 .iscsilun = iscsilun,
285 };
286 }
287
288 static void
289 iscsi_abort_task_cb(struct iscsi_context *iscsi, int status, void *command_data,
290 void *private_data)
291 {
292 IscsiAIOCB *acb = private_data;
293
294 acb->status = -ECANCELED;
295 iscsi_schedule_bh(acb);
296 }
297
298 static void
299 iscsi_aio_cancel(BlockAIOCB *blockacb)
300 {
301 IscsiAIOCB *acb = (IscsiAIOCB *)blockacb;
302 IscsiLun *iscsilun = acb->iscsilun;
303
304 if (acb->status != -EINPROGRESS) {
305 return;
306 }
307
308 /* send a task mgmt call to the target to cancel the task on the target */
309 iscsi_task_mgmt_abort_task_async(iscsilun->iscsi, acb->task,
310 iscsi_abort_task_cb, acb);
311
312 }
313
314 static const AIOCBInfo iscsi_aiocb_info = {
315 .aiocb_size = sizeof(IscsiAIOCB),
316 .cancel_async = iscsi_aio_cancel,
317 };
318
319
320 static void iscsi_process_read(void *arg);
321 static void iscsi_process_write(void *arg);
322
323 /* Called with QemuMutex held. */
324 static void
325 iscsi_set_events(IscsiLun *iscsilun)
326 {
327 struct iscsi_context *iscsi = iscsilun->iscsi;
328 int ev = iscsi_which_events(iscsi);
329
330 if (ev != iscsilun->events) {
331 aio_set_fd_handler(iscsilun->aio_context, iscsi_get_fd(iscsi),
332 false,
333 (ev & POLLIN) ? iscsi_process_read : NULL,
334 (ev & POLLOUT) ? iscsi_process_write : NULL,
335 NULL,
336 iscsilun);
337 iscsilun->events = ev;
338 }
339 }
340
341 static void iscsi_timed_check_events(void *opaque)
342 {
343 IscsiLun *iscsilun = opaque;
344
345 /* check for timed out requests */
346 iscsi_service(iscsilun->iscsi, 0);
347
348 if (iscsilun->request_timed_out) {
349 iscsilun->request_timed_out = false;
350 iscsi_reconnect(iscsilun->iscsi);
351 }
352
353 /* newer versions of libiscsi may return zero events. Ensure we are able
354 * to return to service once this situation changes. */
355 iscsi_set_events(iscsilun);
356
357 timer_mod(iscsilun->event_timer,
358 qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + EVENT_INTERVAL);
359 }
360
361 static void
362 iscsi_process_read(void *arg)
363 {
364 IscsiLun *iscsilun = arg;
365 struct iscsi_context *iscsi = iscsilun->iscsi;
366
367 qemu_mutex_lock(&iscsilun->mutex);
368 iscsi_service(iscsi, POLLIN);
369 iscsi_set_events(iscsilun);
370 qemu_mutex_unlock(&iscsilun->mutex);
371 }
372
373 static void
374 iscsi_process_write(void *arg)
375 {
376 IscsiLun *iscsilun = arg;
377 struct iscsi_context *iscsi = iscsilun->iscsi;
378
379 qemu_mutex_lock(&iscsilun->mutex);
380 iscsi_service(iscsi, POLLOUT);
381 iscsi_set_events(iscsilun);
382 qemu_mutex_unlock(&iscsilun->mutex);
383 }
384
385 static int64_t sector_lun2qemu(int64_t sector, IscsiLun *iscsilun)
386 {
387 return sector * iscsilun->block_size / BDRV_SECTOR_SIZE;
388 }
389
390 static int64_t sector_qemu2lun(int64_t sector, IscsiLun *iscsilun)
391 {
392 return sector * BDRV_SECTOR_SIZE / iscsilun->block_size;
393 }
394
395 static bool is_byte_request_lun_aligned(int64_t offset, int count,
396 IscsiLun *iscsilun)
397 {
398 if (offset % iscsilun->block_size || count % iscsilun->block_size) {
399 error_report("iSCSI misaligned request: "
400 "iscsilun->block_size %u, offset %" PRIi64
401 ", count %d",
402 iscsilun->block_size, offset, count);
403 return false;
404 }
405 return true;
406 }
407
408 static bool is_sector_request_lun_aligned(int64_t sector_num, int nb_sectors,
409 IscsiLun *iscsilun)
410 {
411 assert(nb_sectors <= BDRV_REQUEST_MAX_SECTORS);
412 return is_byte_request_lun_aligned(sector_num << BDRV_SECTOR_BITS,
413 nb_sectors << BDRV_SECTOR_BITS,
414 iscsilun);
415 }
416
417 static void iscsi_allocmap_free(IscsiLun *iscsilun)
418 {
419 g_free(iscsilun->allocmap);
420 g_free(iscsilun->allocmap_valid);
421 iscsilun->allocmap = NULL;
422 iscsilun->allocmap_valid = NULL;
423 }
424
425
426 static int iscsi_allocmap_init(IscsiLun *iscsilun, int open_flags)
427 {
428 iscsi_allocmap_free(iscsilun);
429
430 iscsilun->allocmap_size =
431 DIV_ROUND_UP(sector_lun2qemu(iscsilun->num_blocks, iscsilun),
432 iscsilun->cluster_sectors);
433
434 iscsilun->allocmap = bitmap_try_new(iscsilun->allocmap_size);
435 if (!iscsilun->allocmap) {
436 return -ENOMEM;
437 }
438
439 if (open_flags & BDRV_O_NOCACHE) {
440 /* in case that cache.direct = on all allocmap entries are
441 * treated as invalid to force a relookup of the block
442 * status on every read request */
443 return 0;
444 }
445
446 iscsilun->allocmap_valid = bitmap_try_new(iscsilun->allocmap_size);
447 if (!iscsilun->allocmap_valid) {
448 /* if we are under memory pressure free the allocmap as well */
449 iscsi_allocmap_free(iscsilun);
450 return -ENOMEM;
451 }
452
453 return 0;
454 }
455
456 static void
457 iscsi_allocmap_update(IscsiLun *iscsilun, int64_t sector_num,
458 int nb_sectors, bool allocated, bool valid)
459 {
460 int64_t cl_num_expanded, nb_cls_expanded, cl_num_shrunk, nb_cls_shrunk;
461
462 if (iscsilun->allocmap == NULL) {
463 return;
464 }
465 /* expand to entirely contain all affected clusters */
466 cl_num_expanded = sector_num / iscsilun->cluster_sectors;
467 nb_cls_expanded = DIV_ROUND_UP(sector_num + nb_sectors,
468 iscsilun->cluster_sectors) - cl_num_expanded;
469 /* shrink to touch only completely contained clusters */
470 cl_num_shrunk = DIV_ROUND_UP(sector_num, iscsilun->cluster_sectors);
471 nb_cls_shrunk = (sector_num + nb_sectors) / iscsilun->cluster_sectors
472 - cl_num_shrunk;
473 if (allocated) {
474 bitmap_set(iscsilun->allocmap, cl_num_expanded, nb_cls_expanded);
475 } else {
476 if (nb_cls_shrunk > 0) {
477 bitmap_clear(iscsilun->allocmap, cl_num_shrunk, nb_cls_shrunk);
478 }
479 }
480
481 if (iscsilun->allocmap_valid == NULL) {
482 return;
483 }
484 if (valid) {
485 if (nb_cls_shrunk > 0) {
486 bitmap_set(iscsilun->allocmap_valid, cl_num_shrunk, nb_cls_shrunk);
487 }
488 } else {
489 bitmap_clear(iscsilun->allocmap_valid, cl_num_expanded,
490 nb_cls_expanded);
491 }
492 }
493
494 static void
495 iscsi_allocmap_set_allocated(IscsiLun *iscsilun, int64_t sector_num,
496 int nb_sectors)
497 {
498 iscsi_allocmap_update(iscsilun, sector_num, nb_sectors, true, true);
499 }
500
501 static void
502 iscsi_allocmap_set_unallocated(IscsiLun *iscsilun, int64_t sector_num,
503 int nb_sectors)
504 {
505 /* Note: if cache.direct=on the fifth argument to iscsi_allocmap_update
506 * is ignored, so this will in effect be an iscsi_allocmap_set_invalid.
507 */
508 iscsi_allocmap_update(iscsilun, sector_num, nb_sectors, false, true);
509 }
510
511 static void iscsi_allocmap_set_invalid(IscsiLun *iscsilun, int64_t sector_num,
512 int nb_sectors)
513 {
514 iscsi_allocmap_update(iscsilun, sector_num, nb_sectors, false, false);
515 }
516
517 static void iscsi_allocmap_invalidate(IscsiLun *iscsilun)
518 {
519 if (iscsilun->allocmap) {
520 bitmap_zero(iscsilun->allocmap, iscsilun->allocmap_size);
521 }
522 if (iscsilun->allocmap_valid) {
523 bitmap_zero(iscsilun->allocmap_valid, iscsilun->allocmap_size);
524 }
525 }
526
527 static inline bool
528 iscsi_allocmap_is_allocated(IscsiLun *iscsilun, int64_t sector_num,
529 int nb_sectors)
530 {
531 unsigned long size;
532 if (iscsilun->allocmap == NULL) {
533 return true;
534 }
535 size = DIV_ROUND_UP(sector_num + nb_sectors, iscsilun->cluster_sectors);
536 return !(find_next_bit(iscsilun->allocmap, size,
537 sector_num / iscsilun->cluster_sectors) == size);
538 }
539
540 static inline bool iscsi_allocmap_is_valid(IscsiLun *iscsilun,
541 int64_t sector_num, int nb_sectors)
542 {
543 unsigned long size;
544 if (iscsilun->allocmap_valid == NULL) {
545 return false;
546 }
547 size = DIV_ROUND_UP(sector_num + nb_sectors, iscsilun->cluster_sectors);
548 return (find_next_zero_bit(iscsilun->allocmap_valid, size,
549 sector_num / iscsilun->cluster_sectors) == size);
550 }
551
552 static int coroutine_fn
553 iscsi_co_writev_flags(BlockDriverState *bs, int64_t sector_num, int nb_sectors,
554 QEMUIOVector *iov, int flags)
555 {
556 IscsiLun *iscsilun = bs->opaque;
557 struct IscsiTask iTask;
558 uint64_t lba;
559 uint32_t num_sectors;
560 bool fua = flags & BDRV_REQ_FUA;
561 int r = 0;
562
563 if (fua) {
564 assert(iscsilun->dpofua);
565 }
566 if (!is_sector_request_lun_aligned(sector_num, nb_sectors, iscsilun)) {
567 return -EINVAL;
568 }
569
570 if (bs->bl.max_transfer) {
571 assert(nb_sectors << BDRV_SECTOR_BITS <= bs->bl.max_transfer);
572 }
573
574 lba = sector_qemu2lun(sector_num, iscsilun);
575 num_sectors = sector_qemu2lun(nb_sectors, iscsilun);
576 iscsi_co_init_iscsitask(iscsilun, &iTask);
577 qemu_mutex_lock(&iscsilun->mutex);
578 retry:
579 if (iscsilun->use_16_for_rw) {
580 #if LIBISCSI_API_VERSION >= (20160603)
581 iTask.task = iscsi_write16_iov_task(iscsilun->iscsi, iscsilun->lun, lba,
582 NULL, num_sectors * iscsilun->block_size,
583 iscsilun->block_size, 0, 0, fua, 0, 0,
584 iscsi_co_generic_cb, &iTask,
585 (struct scsi_iovec *)iov->iov, iov->niov);
586 } else {
587 iTask.task = iscsi_write10_iov_task(iscsilun->iscsi, iscsilun->lun, lba,
588 NULL, num_sectors * iscsilun->block_size,
589 iscsilun->block_size, 0, 0, fua, 0, 0,
590 iscsi_co_generic_cb, &iTask,
591 (struct scsi_iovec *)iov->iov, iov->niov);
592 }
593 #else
594 iTask.task = iscsi_write16_task(iscsilun->iscsi, iscsilun->lun, lba,
595 NULL, num_sectors * iscsilun->block_size,
596 iscsilun->block_size, 0, 0, fua, 0, 0,
597 iscsi_co_generic_cb, &iTask);
598 } else {
599 iTask.task = iscsi_write10_task(iscsilun->iscsi, iscsilun->lun, lba,
600 NULL, num_sectors * iscsilun->block_size,
601 iscsilun->block_size, 0, 0, fua, 0, 0,
602 iscsi_co_generic_cb, &iTask);
603 }
604 #endif
605 if (iTask.task == NULL) {
606 qemu_mutex_unlock(&iscsilun->mutex);
607 return -ENOMEM;
608 }
609 #if LIBISCSI_API_VERSION < (20160603)
610 scsi_task_set_iov_out(iTask.task, (struct scsi_iovec *) iov->iov,
611 iov->niov);
612 #endif
613 while (!iTask.complete) {
614 iscsi_set_events(iscsilun);
615 qemu_mutex_unlock(&iscsilun->mutex);
616 qemu_coroutine_yield();
617 qemu_mutex_lock(&iscsilun->mutex);
618 }
619
620 if (iTask.task != NULL) {
621 scsi_free_scsi_task(iTask.task);
622 iTask.task = NULL;
623 }
624
625 if (iTask.do_retry) {
626 iTask.complete = 0;
627 goto retry;
628 }
629
630 if (iTask.status != SCSI_STATUS_GOOD) {
631 iscsi_allocmap_set_invalid(iscsilun, sector_num, nb_sectors);
632 r = iTask.err_code;
633 goto out_unlock;
634 }
635
636 iscsi_allocmap_set_allocated(iscsilun, sector_num, nb_sectors);
637
638 out_unlock:
639 qemu_mutex_unlock(&iscsilun->mutex);
640 return r;
641 }
642
643
644
645 static int64_t coroutine_fn iscsi_co_get_block_status(BlockDriverState *bs,
646 int64_t sector_num,
647 int nb_sectors, int *pnum,
648 BlockDriverState **file)
649 {
650 IscsiLun *iscsilun = bs->opaque;
651 struct scsi_get_lba_status *lbas = NULL;
652 struct scsi_lba_status_descriptor *lbasd = NULL;
653 struct IscsiTask iTask;
654 int64_t ret;
655
656 iscsi_co_init_iscsitask(iscsilun, &iTask);
657
658 if (!is_sector_request_lun_aligned(sector_num, nb_sectors, iscsilun)) {
659 ret = -EINVAL;
660 goto out;
661 }
662
663 /* default to all sectors allocated */
664 ret = BDRV_BLOCK_DATA;
665 ret |= (sector_num << BDRV_SECTOR_BITS) | BDRV_BLOCK_OFFSET_VALID;
666 *pnum = nb_sectors;
667
668 /* LUN does not support logical block provisioning */
669 if (!iscsilun->lbpme) {
670 goto out;
671 }
672
673 qemu_mutex_lock(&iscsilun->mutex);
674 retry:
675 if (iscsi_get_lba_status_task(iscsilun->iscsi, iscsilun->lun,
676 sector_qemu2lun(sector_num, iscsilun),
677 8 + 16, iscsi_co_generic_cb,
678 &iTask) == NULL) {
679 ret = -ENOMEM;
680 goto out_unlock;
681 }
682
683 while (!iTask.complete) {
684 iscsi_set_events(iscsilun);
685 qemu_mutex_unlock(&iscsilun->mutex);
686 qemu_coroutine_yield();
687 qemu_mutex_lock(&iscsilun->mutex);
688 }
689
690 if (iTask.do_retry) {
691 if (iTask.task != NULL) {
692 scsi_free_scsi_task(iTask.task);
693 iTask.task = NULL;
694 }
695 iTask.complete = 0;
696 goto retry;
697 }
698
699 if (iTask.status != SCSI_STATUS_GOOD) {
700 /* in case the get_lba_status_callout fails (i.e.
701 * because the device is busy or the cmd is not
702 * supported) we pretend all blocks are allocated
703 * for backwards compatibility */
704 goto out_unlock;
705 }
706
707 lbas = scsi_datain_unmarshall(iTask.task);
708 if (lbas == NULL) {
709 ret = -EIO;
710 goto out_unlock;
711 }
712
713 lbasd = &lbas->descriptors[0];
714
715 if (sector_qemu2lun(sector_num, iscsilun) != lbasd->lba) {
716 ret = -EIO;
717 goto out_unlock;
718 }
719
720 *pnum = sector_lun2qemu(lbasd->num_blocks, iscsilun);
721
722 if (lbasd->provisioning == SCSI_PROVISIONING_TYPE_DEALLOCATED ||
723 lbasd->provisioning == SCSI_PROVISIONING_TYPE_ANCHORED) {
724 ret &= ~BDRV_BLOCK_DATA;
725 if (iscsilun->lbprz) {
726 ret |= BDRV_BLOCK_ZERO;
727 }
728 }
729
730 if (ret & BDRV_BLOCK_ZERO) {
731 iscsi_allocmap_set_unallocated(iscsilun, sector_num, *pnum);
732 } else {
733 iscsi_allocmap_set_allocated(iscsilun, sector_num, *pnum);
734 }
735
736 if (*pnum > nb_sectors) {
737 *pnum = nb_sectors;
738 }
739 out_unlock:
740 qemu_mutex_unlock(&iscsilun->mutex);
741 out:
742 if (iTask.task != NULL) {
743 scsi_free_scsi_task(iTask.task);
744 }
745 if (ret > 0 && ret & BDRV_BLOCK_OFFSET_VALID) {
746 *file = bs;
747 }
748 return ret;
749 }
750
751 static int coroutine_fn iscsi_co_readv(BlockDriverState *bs,
752 int64_t sector_num, int nb_sectors,
753 QEMUIOVector *iov)
754 {
755 IscsiLun *iscsilun = bs->opaque;
756 struct IscsiTask iTask;
757 uint64_t lba;
758 uint32_t num_sectors;
759
760 if (!is_sector_request_lun_aligned(sector_num, nb_sectors, iscsilun)) {
761 return -EINVAL;
762 }
763
764 if (bs->bl.max_transfer) {
765 assert(nb_sectors << BDRV_SECTOR_BITS <= bs->bl.max_transfer);
766 }
767
768 /* if cache.direct is off and we have a valid entry in our allocation map
769 * we can skip checking the block status and directly return zeroes if
770 * the request falls within an unallocated area */
771 if (iscsi_allocmap_is_valid(iscsilun, sector_num, nb_sectors) &&
772 !iscsi_allocmap_is_allocated(iscsilun, sector_num, nb_sectors)) {
773 qemu_iovec_memset(iov, 0, 0x00, iov->size);
774 return 0;
775 }
776
777 if (nb_sectors >= ISCSI_CHECKALLOC_THRES &&
778 !iscsi_allocmap_is_valid(iscsilun, sector_num, nb_sectors) &&
779 !iscsi_allocmap_is_allocated(iscsilun, sector_num, nb_sectors)) {
780 int pnum;
781 BlockDriverState *file;
782 /* check the block status from the beginning of the cluster
783 * containing the start sector */
784 int64_t ret = iscsi_co_get_block_status(bs,
785 sector_num - sector_num % iscsilun->cluster_sectors,
786 BDRV_REQUEST_MAX_SECTORS, &pnum, &file);
787 if (ret < 0) {
788 return ret;
789 }
790 /* if the whole request falls into an unallocated area we can avoid
791 * to read and directly return zeroes instead */
792 if (ret & BDRV_BLOCK_ZERO &&
793 pnum >= nb_sectors + sector_num % iscsilun->cluster_sectors) {
794 qemu_iovec_memset(iov, 0, 0x00, iov->size);
795 return 0;
796 }
797 }
798
799 lba = sector_qemu2lun(sector_num, iscsilun);
800 num_sectors = sector_qemu2lun(nb_sectors, iscsilun);
801
802 iscsi_co_init_iscsitask(iscsilun, &iTask);
803 qemu_mutex_lock(&iscsilun->mutex);
804 retry:
805 if (iscsilun->use_16_for_rw) {
806 #if LIBISCSI_API_VERSION >= (20160603)
807 iTask.task = iscsi_read16_iov_task(iscsilun->iscsi, iscsilun->lun, lba,
808 num_sectors * iscsilun->block_size,
809 iscsilun->block_size, 0, 0, 0, 0, 0,
810 iscsi_co_generic_cb, &iTask,
811 (struct scsi_iovec *)iov->iov, iov->niov);
812 } else {
813 iTask.task = iscsi_read10_iov_task(iscsilun->iscsi, iscsilun->lun, lba,
814 num_sectors * iscsilun->block_size,
815 iscsilun->block_size,
816 0, 0, 0, 0, 0,
817 iscsi_co_generic_cb, &iTask,
818 (struct scsi_iovec *)iov->iov, iov->niov);
819 }
820 #else
821 iTask.task = iscsi_read16_task(iscsilun->iscsi, iscsilun->lun, lba,
822 num_sectors * iscsilun->block_size,
823 iscsilun->block_size, 0, 0, 0, 0, 0,
824 iscsi_co_generic_cb, &iTask);
825 } else {
826 iTask.task = iscsi_read10_task(iscsilun->iscsi, iscsilun->lun, lba,
827 num_sectors * iscsilun->block_size,
828 iscsilun->block_size,
829 0, 0, 0, 0, 0,
830 iscsi_co_generic_cb, &iTask);
831 }
832 #endif
833 if (iTask.task == NULL) {
834 qemu_mutex_unlock(&iscsilun->mutex);
835 return -ENOMEM;
836 }
837 #if LIBISCSI_API_VERSION < (20160603)
838 scsi_task_set_iov_in(iTask.task, (struct scsi_iovec *) iov->iov, iov->niov);
839 #endif
840 while (!iTask.complete) {
841 iscsi_set_events(iscsilun);
842 qemu_mutex_unlock(&iscsilun->mutex);
843 qemu_coroutine_yield();
844 qemu_mutex_lock(&iscsilun->mutex);
845 }
846
847 if (iTask.task != NULL) {
848 scsi_free_scsi_task(iTask.task);
849 iTask.task = NULL;
850 }
851
852 if (iTask.do_retry) {
853 iTask.complete = 0;
854 goto retry;
855 }
856 qemu_mutex_unlock(&iscsilun->mutex);
857
858 if (iTask.status != SCSI_STATUS_GOOD) {
859 return iTask.err_code;
860 }
861
862 return 0;
863 }
864
865 static int coroutine_fn iscsi_co_flush(BlockDriverState *bs)
866 {
867 IscsiLun *iscsilun = bs->opaque;
868 struct IscsiTask iTask;
869
870 iscsi_co_init_iscsitask(iscsilun, &iTask);
871 qemu_mutex_lock(&iscsilun->mutex);
872 retry:
873 if (iscsi_synchronizecache10_task(iscsilun->iscsi, iscsilun->lun, 0, 0, 0,
874 0, iscsi_co_generic_cb, &iTask) == NULL) {
875 qemu_mutex_unlock(&iscsilun->mutex);
876 return -ENOMEM;
877 }
878
879 while (!iTask.complete) {
880 iscsi_set_events(iscsilun);
881 qemu_mutex_unlock(&iscsilun->mutex);
882 qemu_coroutine_yield();
883 qemu_mutex_lock(&iscsilun->mutex);
884 }
885
886 if (iTask.task != NULL) {
887 scsi_free_scsi_task(iTask.task);
888 iTask.task = NULL;
889 }
890
891 if (iTask.do_retry) {
892 iTask.complete = 0;
893 goto retry;
894 }
895 qemu_mutex_unlock(&iscsilun->mutex);
896
897 if (iTask.status != SCSI_STATUS_GOOD) {
898 return iTask.err_code;
899 }
900
901 return 0;
902 }
903
904 #ifdef __linux__
905 /* Called (via iscsi_service) with QemuMutex held. */
906 static void
907 iscsi_aio_ioctl_cb(struct iscsi_context *iscsi, int status,
908 void *command_data, void *opaque)
909 {
910 IscsiAIOCB *acb = opaque;
911
912 g_free(acb->buf);
913 acb->buf = NULL;
914
915 acb->status = 0;
916 if (status < 0) {
917 error_report("Failed to ioctl(SG_IO) to iSCSI lun. %s",
918 iscsi_get_error(iscsi));
919 acb->status = iscsi_translate_sense(&acb->task->sense);
920 }
921
922 acb->ioh->driver_status = 0;
923 acb->ioh->host_status = 0;
924 acb->ioh->resid = 0;
925 acb->ioh->status = status;
926
927 #define SG_ERR_DRIVER_SENSE 0x08
928
929 if (status == SCSI_STATUS_CHECK_CONDITION && acb->task->datain.size >= 2) {
930 int ss;
931
932 acb->ioh->driver_status |= SG_ERR_DRIVER_SENSE;
933
934 acb->ioh->sb_len_wr = acb->task->datain.size - 2;
935 ss = (acb->ioh->mx_sb_len >= acb->ioh->sb_len_wr) ?
936 acb->ioh->mx_sb_len : acb->ioh->sb_len_wr;
937 memcpy(acb->ioh->sbp, &acb->task->datain.data[2], ss);
938 }
939
940 iscsi_schedule_bh(acb);
941 }
942
943 static void iscsi_ioctl_bh_completion(void *opaque)
944 {
945 IscsiAIOCB *acb = opaque;
946
947 qemu_bh_delete(acb->bh);
948 acb->common.cb(acb->common.opaque, acb->ret);
949 qemu_aio_unref(acb);
950 }
951
952 static void iscsi_ioctl_handle_emulated(IscsiAIOCB *acb, int req, void *buf)
953 {
954 BlockDriverState *bs = acb->common.bs;
955 IscsiLun *iscsilun = bs->opaque;
956 int ret = 0;
957
958 switch (req) {
959 case SG_GET_VERSION_NUM:
960 *(int *)buf = 30000;
961 break;
962 case SG_GET_SCSI_ID:
963 ((struct sg_scsi_id *)buf)->scsi_type = iscsilun->type;
964 break;
965 default:
966 ret = -EINVAL;
967 }
968 assert(!acb->bh);
969 acb->bh = aio_bh_new(bdrv_get_aio_context(bs),
970 iscsi_ioctl_bh_completion, acb);
971 acb->ret = ret;
972 qemu_bh_schedule(acb->bh);
973 }
974
975 static BlockAIOCB *iscsi_aio_ioctl(BlockDriverState *bs,
976 unsigned long int req, void *buf,
977 BlockCompletionFunc *cb, void *opaque)
978 {
979 IscsiLun *iscsilun = bs->opaque;
980 struct iscsi_context *iscsi = iscsilun->iscsi;
981 struct iscsi_data data;
982 IscsiAIOCB *acb;
983
984 acb = qemu_aio_get(&iscsi_aiocb_info, bs, cb, opaque);
985
986 acb->iscsilun = iscsilun;
987 acb->bh = NULL;
988 acb->status = -EINPROGRESS;
989 acb->buf = NULL;
990 acb->ioh = buf;
991
992 if (req != SG_IO) {
993 iscsi_ioctl_handle_emulated(acb, req, buf);
994 return &acb->common;
995 }
996
997 if (acb->ioh->cmd_len > SCSI_CDB_MAX_SIZE) {
998 error_report("iSCSI: ioctl error CDB exceeds max size (%d > %d)",
999 acb->ioh->cmd_len, SCSI_CDB_MAX_SIZE);
1000 qemu_aio_unref(acb);
1001 return NULL;
1002 }
1003
1004 acb->task = malloc(sizeof(struct scsi_task));
1005 if (acb->task == NULL) {
1006 error_report("iSCSI: Failed to allocate task for scsi command. %s",
1007 iscsi_get_error(iscsi));
1008 qemu_aio_unref(acb);
1009 return NULL;
1010 }
1011 memset(acb->task, 0, sizeof(struct scsi_task));
1012
1013 switch (acb->ioh->dxfer_direction) {
1014 case SG_DXFER_TO_DEV:
1015 acb->task->xfer_dir = SCSI_XFER_WRITE;
1016 break;
1017 case SG_DXFER_FROM_DEV:
1018 acb->task->xfer_dir = SCSI_XFER_READ;
1019 break;
1020 default:
1021 acb->task->xfer_dir = SCSI_XFER_NONE;
1022 break;
1023 }
1024
1025 acb->task->cdb_size = acb->ioh->cmd_len;
1026 memcpy(&acb->task->cdb[0], acb->ioh->cmdp, acb->ioh->cmd_len);
1027 acb->task->expxferlen = acb->ioh->dxfer_len;
1028
1029 data.size = 0;
1030 qemu_mutex_lock(&iscsilun->mutex);
1031 if (acb->task->xfer_dir == SCSI_XFER_WRITE) {
1032 if (acb->ioh->iovec_count == 0) {
1033 data.data = acb->ioh->dxferp;
1034 data.size = acb->ioh->dxfer_len;
1035 } else {
1036 scsi_task_set_iov_out(acb->task,
1037 (struct scsi_iovec *) acb->ioh->dxferp,
1038 acb->ioh->iovec_count);
1039 }
1040 }
1041
1042 if (iscsi_scsi_command_async(iscsi, iscsilun->lun, acb->task,
1043 iscsi_aio_ioctl_cb,
1044 (data.size > 0) ? &data : NULL,
1045 acb) != 0) {
1046 qemu_mutex_unlock(&iscsilun->mutex);
1047 scsi_free_scsi_task(acb->task);
1048 qemu_aio_unref(acb);
1049 return NULL;
1050 }
1051
1052 /* tell libiscsi to read straight into the buffer we got from ioctl */
1053 if (acb->task->xfer_dir == SCSI_XFER_READ) {
1054 if (acb->ioh->iovec_count == 0) {
1055 scsi_task_add_data_in_buffer(acb->task,
1056 acb->ioh->dxfer_len,
1057 acb->ioh->dxferp);
1058 } else {
1059 scsi_task_set_iov_in(acb->task,
1060 (struct scsi_iovec *) acb->ioh->dxferp,
1061 acb->ioh->iovec_count);
1062 }
1063 }
1064
1065 iscsi_set_events(iscsilun);
1066 qemu_mutex_unlock(&iscsilun->mutex);
1067
1068 return &acb->common;
1069 }
1070
1071 #endif
1072
1073 static int64_t
1074 iscsi_getlength(BlockDriverState *bs)
1075 {
1076 IscsiLun *iscsilun = bs->opaque;
1077 int64_t len;
1078
1079 len = iscsilun->num_blocks;
1080 len *= iscsilun->block_size;
1081
1082 return len;
1083 }
1084
1085 static int
1086 coroutine_fn iscsi_co_pdiscard(BlockDriverState *bs, int64_t offset, int bytes)
1087 {
1088 IscsiLun *iscsilun = bs->opaque;
1089 struct IscsiTask iTask;
1090 struct unmap_list list;
1091 int r = 0;
1092
1093 if (!is_byte_request_lun_aligned(offset, bytes, iscsilun)) {
1094 return -ENOTSUP;
1095 }
1096
1097 if (!iscsilun->lbp.lbpu) {
1098 /* UNMAP is not supported by the target */
1099 return 0;
1100 }
1101
1102 list.lba = offset / iscsilun->block_size;
1103 list.num = bytes / iscsilun->block_size;
1104
1105 iscsi_co_init_iscsitask(iscsilun, &iTask);
1106 qemu_mutex_lock(&iscsilun->mutex);
1107 retry:
1108 if (iscsi_unmap_task(iscsilun->iscsi, iscsilun->lun, 0, 0, &list, 1,
1109 iscsi_co_generic_cb, &iTask) == NULL) {
1110 r = -ENOMEM;
1111 goto out_unlock;
1112 }
1113
1114 while (!iTask.complete) {
1115 iscsi_set_events(iscsilun);
1116 qemu_mutex_unlock(&iscsilun->mutex);
1117 qemu_coroutine_yield();
1118 qemu_mutex_lock(&iscsilun->mutex);
1119 }
1120
1121 if (iTask.task != NULL) {
1122 scsi_free_scsi_task(iTask.task);
1123 iTask.task = NULL;
1124 }
1125
1126 if (iTask.do_retry) {
1127 iTask.complete = 0;
1128 goto retry;
1129 }
1130
1131 if (iTask.status == SCSI_STATUS_CHECK_CONDITION) {
1132 /* the target might fail with a check condition if it
1133 is not happy with the alignment of the UNMAP request
1134 we silently fail in this case */
1135 goto out_unlock;
1136 }
1137
1138 if (iTask.status != SCSI_STATUS_GOOD) {
1139 r = iTask.err_code;
1140 goto out_unlock;
1141 }
1142
1143 iscsi_allocmap_set_invalid(iscsilun, offset >> BDRV_SECTOR_BITS,
1144 bytes >> BDRV_SECTOR_BITS);
1145
1146 out_unlock:
1147 qemu_mutex_unlock(&iscsilun->mutex);
1148 return r;
1149 }
1150
1151 static int
1152 coroutine_fn iscsi_co_pwrite_zeroes(BlockDriverState *bs, int64_t offset,
1153 int bytes, BdrvRequestFlags flags)
1154 {
1155 IscsiLun *iscsilun = bs->opaque;
1156 struct IscsiTask iTask;
1157 uint64_t lba;
1158 uint32_t nb_blocks;
1159 bool use_16_for_ws = iscsilun->use_16_for_rw;
1160 int r = 0;
1161
1162 if (!is_byte_request_lun_aligned(offset, bytes, iscsilun)) {
1163 return -ENOTSUP;
1164 }
1165
1166 if (flags & BDRV_REQ_MAY_UNMAP) {
1167 if (!use_16_for_ws && !iscsilun->lbp.lbpws10) {
1168 /* WRITESAME10 with UNMAP is unsupported try WRITESAME16 */
1169 use_16_for_ws = true;
1170 }
1171 if (use_16_for_ws && !iscsilun->lbp.lbpws) {
1172 /* WRITESAME16 with UNMAP is not supported by the target,
1173 * fall back and try WRITESAME10/16 without UNMAP */
1174 flags &= ~BDRV_REQ_MAY_UNMAP;
1175 use_16_for_ws = iscsilun->use_16_for_rw;
1176 }
1177 }
1178
1179 if (!(flags & BDRV_REQ_MAY_UNMAP) && !iscsilun->has_write_same) {
1180 /* WRITESAME without UNMAP is not supported by the target */
1181 return -ENOTSUP;
1182 }
1183
1184 lba = offset / iscsilun->block_size;
1185 nb_blocks = bytes / iscsilun->block_size;
1186
1187 if (iscsilun->zeroblock == NULL) {
1188 iscsilun->zeroblock = g_try_malloc0(iscsilun->block_size);
1189 if (iscsilun->zeroblock == NULL) {
1190 return -ENOMEM;
1191 }
1192 }
1193
1194 qemu_mutex_lock(&iscsilun->mutex);
1195 iscsi_co_init_iscsitask(iscsilun, &iTask);
1196 retry:
1197 if (use_16_for_ws) {
1198 iTask.task = iscsi_writesame16_task(iscsilun->iscsi, iscsilun->lun, lba,
1199 iscsilun->zeroblock, iscsilun->block_size,
1200 nb_blocks, 0, !!(flags & BDRV_REQ_MAY_UNMAP),
1201 0, 0, iscsi_co_generic_cb, &iTask);
1202 } else {
1203 iTask.task = iscsi_writesame10_task(iscsilun->iscsi, iscsilun->lun, lba,
1204 iscsilun->zeroblock, iscsilun->block_size,
1205 nb_blocks, 0, !!(flags & BDRV_REQ_MAY_UNMAP),
1206 0, 0, iscsi_co_generic_cb, &iTask);
1207 }
1208 if (iTask.task == NULL) {
1209 qemu_mutex_unlock(&iscsilun->mutex);
1210 return -ENOMEM;
1211 }
1212
1213 while (!iTask.complete) {
1214 iscsi_set_events(iscsilun);
1215 qemu_mutex_unlock(&iscsilun->mutex);
1216 qemu_coroutine_yield();
1217 qemu_mutex_lock(&iscsilun->mutex);
1218 }
1219
1220 if (iTask.status == SCSI_STATUS_CHECK_CONDITION &&
1221 iTask.task->sense.key == SCSI_SENSE_ILLEGAL_REQUEST &&
1222 (iTask.task->sense.ascq == SCSI_SENSE_ASCQ_INVALID_OPERATION_CODE ||
1223 iTask.task->sense.ascq == SCSI_SENSE_ASCQ_INVALID_FIELD_IN_CDB)) {
1224 /* WRITE SAME is not supported by the target */
1225 iscsilun->has_write_same = false;
1226 scsi_free_scsi_task(iTask.task);
1227 r = -ENOTSUP;
1228 goto out_unlock;
1229 }
1230
1231 if (iTask.task != NULL) {
1232 scsi_free_scsi_task(iTask.task);
1233 iTask.task = NULL;
1234 }
1235
1236 if (iTask.do_retry) {
1237 iTask.complete = 0;
1238 goto retry;
1239 }
1240
1241 if (iTask.status != SCSI_STATUS_GOOD) {
1242 iscsi_allocmap_set_invalid(iscsilun, offset >> BDRV_SECTOR_BITS,
1243 bytes >> BDRV_SECTOR_BITS);
1244 r = iTask.err_code;
1245 goto out_unlock;
1246 }
1247
1248 if (flags & BDRV_REQ_MAY_UNMAP) {
1249 iscsi_allocmap_set_invalid(iscsilun, offset >> BDRV_SECTOR_BITS,
1250 bytes >> BDRV_SECTOR_BITS);
1251 } else {
1252 iscsi_allocmap_set_allocated(iscsilun, offset >> BDRV_SECTOR_BITS,
1253 bytes >> BDRV_SECTOR_BITS);
1254 }
1255
1256 out_unlock:
1257 qemu_mutex_unlock(&iscsilun->mutex);
1258 return r;
1259 }
1260
1261 static void apply_chap(struct iscsi_context *iscsi, QemuOpts *opts,
1262 Error **errp)
1263 {
1264 const char *user = NULL;
1265 const char *password = NULL;
1266 const char *secretid;
1267 char *secret = NULL;
1268
1269 user = qemu_opt_get(opts, "user");
1270 if (!user) {
1271 return;
1272 }
1273
1274 secretid = qemu_opt_get(opts, "password-secret");
1275 password = qemu_opt_get(opts, "password");
1276 if (secretid && password) {
1277 error_setg(errp, "'password' and 'password-secret' properties are "
1278 "mutually exclusive");
1279 return;
1280 }
1281 if (secretid) {
1282 secret = qcrypto_secret_lookup_as_utf8(secretid, errp);
1283 if (!secret) {
1284 return;
1285 }
1286 password = secret;
1287 } else if (!password) {
1288 error_setg(errp, "CHAP username specified but no password was given");
1289 return;
1290 }
1291
1292 if (iscsi_set_initiator_username_pwd(iscsi, user, password)) {
1293 error_setg(errp, "Failed to set initiator username and password");
1294 }
1295
1296 g_free(secret);
1297 }
1298
1299 static void apply_header_digest(struct iscsi_context *iscsi, QemuOpts *opts,
1300 Error **errp)
1301 {
1302 const char *digest = NULL;
1303
1304 digest = qemu_opt_get(opts, "header-digest");
1305 if (!digest) {
1306 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE_CRC32C);
1307 } else if (!strcmp(digest, "crc32c")) {
1308 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_CRC32C);
1309 } else if (!strcmp(digest, "none")) {
1310 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE);
1311 } else if (!strcmp(digest, "crc32c-none")) {
1312 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_CRC32C_NONE);
1313 } else if (!strcmp(digest, "none-crc32c")) {
1314 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE_CRC32C);
1315 } else {
1316 error_setg(errp, "Invalid header-digest setting : %s", digest);
1317 }
1318 }
1319
1320 static char *get_initiator_name(QemuOpts *opts)
1321 {
1322 const char *name;
1323 char *iscsi_name;
1324 UuidInfo *uuid_info;
1325
1326 name = qemu_opt_get(opts, "initiator-name");
1327 if (name) {
1328 return g_strdup(name);
1329 }
1330
1331 uuid_info = qmp_query_uuid(NULL);
1332 if (strcmp(uuid_info->UUID, UUID_NONE) == 0) {
1333 name = qemu_get_vm_name();
1334 } else {
1335 name = uuid_info->UUID;
1336 }
1337 iscsi_name = g_strdup_printf("iqn.2008-11.org.linux-kvm%s%s",
1338 name ? ":" : "", name ? name : "");
1339 qapi_free_UuidInfo(uuid_info);
1340 return iscsi_name;
1341 }
1342
1343 static void iscsi_nop_timed_event(void *opaque)
1344 {
1345 IscsiLun *iscsilun = opaque;
1346
1347 qemu_mutex_lock(&iscsilun->mutex);
1348 if (iscsi_get_nops_in_flight(iscsilun->iscsi) >= MAX_NOP_FAILURES) {
1349 error_report("iSCSI: NOP timeout. Reconnecting...");
1350 iscsilun->request_timed_out = true;
1351 } else if (iscsi_nop_out_async(iscsilun->iscsi, NULL, NULL, 0, NULL) != 0) {
1352 error_report("iSCSI: failed to sent NOP-Out. Disabling NOP messages.");
1353 goto out;
1354 }
1355
1356 timer_mod(iscsilun->nop_timer, qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + NOP_INTERVAL);
1357 iscsi_set_events(iscsilun);
1358
1359 out:
1360 qemu_mutex_unlock(&iscsilun->mutex);
1361 }
1362
1363 static void iscsi_readcapacity_sync(IscsiLun *iscsilun, Error **errp)
1364 {
1365 struct scsi_task *task = NULL;
1366 struct scsi_readcapacity10 *rc10 = NULL;
1367 struct scsi_readcapacity16 *rc16 = NULL;
1368 int retries = ISCSI_CMD_RETRIES;
1369
1370 do {
1371 if (task != NULL) {
1372 scsi_free_scsi_task(task);
1373 task = NULL;
1374 }
1375
1376 switch (iscsilun->type) {
1377 case TYPE_DISK:
1378 task = iscsi_readcapacity16_sync(iscsilun->iscsi, iscsilun->lun);
1379 if (task != NULL && task->status == SCSI_STATUS_GOOD) {
1380 rc16 = scsi_datain_unmarshall(task);
1381 if (rc16 == NULL) {
1382 error_setg(errp, "iSCSI: Failed to unmarshall readcapacity16 data.");
1383 } else {
1384 iscsilun->block_size = rc16->block_length;
1385 iscsilun->num_blocks = rc16->returned_lba + 1;
1386 iscsilun->lbpme = !!rc16->lbpme;
1387 iscsilun->lbprz = !!rc16->lbprz;
1388 iscsilun->use_16_for_rw = (rc16->returned_lba > 0xffffffff);
1389 }
1390 break;
1391 }
1392 if (task != NULL && task->status == SCSI_STATUS_CHECK_CONDITION
1393 && task->sense.key == SCSI_SENSE_UNIT_ATTENTION) {
1394 break;
1395 }
1396 /* Fall through and try READ CAPACITY(10) instead. */
1397 case TYPE_ROM:
1398 task = iscsi_readcapacity10_sync(iscsilun->iscsi, iscsilun->lun, 0, 0);
1399 if (task != NULL && task->status == SCSI_STATUS_GOOD) {
1400 rc10 = scsi_datain_unmarshall(task);
1401 if (rc10 == NULL) {
1402 error_setg(errp, "iSCSI: Failed to unmarshall readcapacity10 data.");
1403 } else {
1404 iscsilun->block_size = rc10->block_size;
1405 if (rc10->lba == 0) {
1406 /* blank disk loaded */
1407 iscsilun->num_blocks = 0;
1408 } else {
1409 iscsilun->num_blocks = rc10->lba + 1;
1410 }
1411 }
1412 }
1413 break;
1414 default:
1415 return;
1416 }
1417 } while (task != NULL && task->status == SCSI_STATUS_CHECK_CONDITION
1418 && task->sense.key == SCSI_SENSE_UNIT_ATTENTION
1419 && retries-- > 0);
1420
1421 if (task == NULL || task->status != SCSI_STATUS_GOOD) {
1422 error_setg(errp, "iSCSI: failed to send readcapacity10/16 command");
1423 } else if (!iscsilun->block_size ||
1424 iscsilun->block_size % BDRV_SECTOR_SIZE) {
1425 error_setg(errp, "iSCSI: the target returned an invalid "
1426 "block size of %d.", iscsilun->block_size);
1427 }
1428 if (task) {
1429 scsi_free_scsi_task(task);
1430 }
1431 }
1432
1433 static struct scsi_task *iscsi_do_inquiry(struct iscsi_context *iscsi, int lun,
1434 int evpd, int pc, void **inq, Error **errp)
1435 {
1436 int full_size;
1437 struct scsi_task *task = NULL;
1438 task = iscsi_inquiry_sync(iscsi, lun, evpd, pc, 64);
1439 if (task == NULL || task->status != SCSI_STATUS_GOOD) {
1440 goto fail;
1441 }
1442 full_size = scsi_datain_getfullsize(task);
1443 if (full_size > task->datain.size) {
1444 scsi_free_scsi_task(task);
1445
1446 /* we need more data for the full list */
1447 task = iscsi_inquiry_sync(iscsi, lun, evpd, pc, full_size);
1448 if (task == NULL || task->status != SCSI_STATUS_GOOD) {
1449 goto fail;
1450 }
1451 }
1452
1453 *inq = scsi_datain_unmarshall(task);
1454 if (*inq == NULL) {
1455 error_setg(errp, "iSCSI: failed to unmarshall inquiry datain blob");
1456 goto fail_with_err;
1457 }
1458
1459 return task;
1460
1461 fail:
1462 error_setg(errp, "iSCSI: Inquiry command failed : %s",
1463 iscsi_get_error(iscsi));
1464 fail_with_err:
1465 if (task != NULL) {
1466 scsi_free_scsi_task(task);
1467 }
1468 return NULL;
1469 }
1470
1471 static void iscsi_detach_aio_context(BlockDriverState *bs)
1472 {
1473 IscsiLun *iscsilun = bs->opaque;
1474
1475 aio_set_fd_handler(iscsilun->aio_context, iscsi_get_fd(iscsilun->iscsi),
1476 false, NULL, NULL, NULL, NULL);
1477 iscsilun->events = 0;
1478
1479 if (iscsilun->nop_timer) {
1480 timer_del(iscsilun->nop_timer);
1481 timer_free(iscsilun->nop_timer);
1482 iscsilun->nop_timer = NULL;
1483 }
1484 if (iscsilun->event_timer) {
1485 timer_del(iscsilun->event_timer);
1486 timer_free(iscsilun->event_timer);
1487 iscsilun->event_timer = NULL;
1488 }
1489 }
1490
1491 static void iscsi_attach_aio_context(BlockDriverState *bs,
1492 AioContext *new_context)
1493 {
1494 IscsiLun *iscsilun = bs->opaque;
1495
1496 iscsilun->aio_context = new_context;
1497 iscsi_set_events(iscsilun);
1498
1499 /* Set up a timer for sending out iSCSI NOPs */
1500 iscsilun->nop_timer = aio_timer_new(iscsilun->aio_context,
1501 QEMU_CLOCK_REALTIME, SCALE_MS,
1502 iscsi_nop_timed_event, iscsilun);
1503 timer_mod(iscsilun->nop_timer,
1504 qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + NOP_INTERVAL);
1505
1506 /* Set up a timer for periodic calls to iscsi_set_events and to
1507 * scan for command timeout */
1508 iscsilun->event_timer = aio_timer_new(iscsilun->aio_context,
1509 QEMU_CLOCK_REALTIME, SCALE_MS,
1510 iscsi_timed_check_events, iscsilun);
1511 timer_mod(iscsilun->event_timer,
1512 qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + EVENT_INTERVAL);
1513 }
1514
1515 static void iscsi_modesense_sync(IscsiLun *iscsilun)
1516 {
1517 struct scsi_task *task;
1518 struct scsi_mode_sense *ms = NULL;
1519 iscsilun->write_protected = false;
1520 iscsilun->dpofua = false;
1521
1522 task = iscsi_modesense6_sync(iscsilun->iscsi, iscsilun->lun,
1523 1, SCSI_MODESENSE_PC_CURRENT,
1524 0x3F, 0, 255);
1525 if (task == NULL) {
1526 error_report("iSCSI: Failed to send MODE_SENSE(6) command: %s",
1527 iscsi_get_error(iscsilun->iscsi));
1528 goto out;
1529 }
1530
1531 if (task->status != SCSI_STATUS_GOOD) {
1532 error_report("iSCSI: Failed MODE_SENSE(6), LUN assumed writable");
1533 goto out;
1534 }
1535 ms = scsi_datain_unmarshall(task);
1536 if (!ms) {
1537 error_report("iSCSI: Failed to unmarshall MODE_SENSE(6) data: %s",
1538 iscsi_get_error(iscsilun->iscsi));
1539 goto out;
1540 }
1541 iscsilun->write_protected = ms->device_specific_parameter & 0x80;
1542 iscsilun->dpofua = ms->device_specific_parameter & 0x10;
1543
1544 out:
1545 if (task) {
1546 scsi_free_scsi_task(task);
1547 }
1548 }
1549
1550 static void iscsi_parse_iscsi_option(const char *target, QDict *options)
1551 {
1552 QemuOptsList *list;
1553 QemuOpts *opts;
1554 const char *user, *password, *password_secret, *initiator_name,
1555 *header_digest, *timeout;
1556
1557 list = qemu_find_opts("iscsi");
1558 if (!list) {
1559 return;
1560 }
1561
1562 opts = qemu_opts_find(list, target);
1563 if (opts == NULL) {
1564 opts = QTAILQ_FIRST(&list->head);
1565 if (!opts) {
1566 return;
1567 }
1568 }
1569
1570 user = qemu_opt_get(opts, "user");
1571 if (user) {
1572 qdict_set_default_str(options, "user", user);
1573 }
1574
1575 password = qemu_opt_get(opts, "password");
1576 if (password) {
1577 qdict_set_default_str(options, "password", password);
1578 }
1579
1580 password_secret = qemu_opt_get(opts, "password-secret");
1581 if (password_secret) {
1582 qdict_set_default_str(options, "password-secret", password_secret);
1583 }
1584
1585 initiator_name = qemu_opt_get(opts, "initiator-name");
1586 if (initiator_name) {
1587 qdict_set_default_str(options, "initiator-name", initiator_name);
1588 }
1589
1590 header_digest = qemu_opt_get(opts, "header-digest");
1591 if (header_digest) {
1592 /* -iscsi takes upper case values, but QAPI only supports lower case
1593 * enum constant names, so we have to convert here. */
1594 char *qapi_value = g_ascii_strdown(header_digest, -1);
1595 qdict_set_default_str(options, "header-digest", qapi_value);
1596 g_free(qapi_value);
1597 }
1598
1599 timeout = qemu_opt_get(opts, "timeout");
1600 if (timeout) {
1601 qdict_set_default_str(options, "timeout", timeout);
1602 }
1603 }
1604
1605 /*
1606 * We support iscsi url's on the form
1607 * iscsi://[<username>%<password>@]<host>[:<port>]/<targetname>/<lun>
1608 */
1609 static void iscsi_parse_filename(const char *filename, QDict *options,
1610 Error **errp)
1611 {
1612 struct iscsi_url *iscsi_url;
1613 const char *transport_name;
1614 char *lun_str;
1615
1616 iscsi_url = iscsi_parse_full_url(NULL, filename);
1617 if (iscsi_url == NULL) {
1618 error_setg(errp, "Failed to parse URL : %s", filename);
1619 return;
1620 }
1621
1622 #if LIBISCSI_API_VERSION >= (20160603)
1623 switch (iscsi_url->transport) {
1624 case TCP_TRANSPORT:
1625 transport_name = "tcp";
1626 break;
1627 case ISER_TRANSPORT:
1628 transport_name = "iser";
1629 break;
1630 default:
1631 error_setg(errp, "Unknown transport type (%d)",
1632 iscsi_url->transport);
1633 return;
1634 }
1635 #else
1636 transport_name = "tcp";
1637 #endif
1638
1639 qdict_set_default_str(options, "transport", transport_name);
1640 qdict_set_default_str(options, "portal", iscsi_url->portal);
1641 qdict_set_default_str(options, "target", iscsi_url->target);
1642
1643 lun_str = g_strdup_printf("%d", iscsi_url->lun);
1644 qdict_set_default_str(options, "lun", lun_str);
1645 g_free(lun_str);
1646
1647 /* User/password from -iscsi take precedence over those from the URL */
1648 iscsi_parse_iscsi_option(iscsi_url->target, options);
1649
1650 if (iscsi_url->user[0] != '\0') {
1651 qdict_set_default_str(options, "user", iscsi_url->user);
1652 qdict_set_default_str(options, "password", iscsi_url->passwd);
1653 }
1654
1655 iscsi_destroy_url(iscsi_url);
1656 }
1657
1658 static QemuOptsList runtime_opts = {
1659 .name = "iscsi",
1660 .head = QTAILQ_HEAD_INITIALIZER(runtime_opts.head),
1661 .desc = {
1662 {
1663 .name = "transport",
1664 .type = QEMU_OPT_STRING,
1665 },
1666 {
1667 .name = "portal",
1668 .type = QEMU_OPT_STRING,
1669 },
1670 {
1671 .name = "target",
1672 .type = QEMU_OPT_STRING,
1673 },
1674 {
1675 .name = "user",
1676 .type = QEMU_OPT_STRING,
1677 },
1678 {
1679 .name = "password",
1680 .type = QEMU_OPT_STRING,
1681 },
1682 {
1683 .name = "password-secret",
1684 .type = QEMU_OPT_STRING,
1685 },
1686 {
1687 .name = "lun",
1688 .type = QEMU_OPT_NUMBER,
1689 },
1690 {
1691 .name = "initiator-name",
1692 .type = QEMU_OPT_STRING,
1693 },
1694 {
1695 .name = "header-digest",
1696 .type = QEMU_OPT_STRING,
1697 },
1698 {
1699 .name = "timeout",
1700 .type = QEMU_OPT_NUMBER,
1701 },
1702 {
1703 .name = "filename",
1704 .type = QEMU_OPT_STRING,
1705 },
1706 { /* end of list */ }
1707 },
1708 };
1709
1710 static int iscsi_open(BlockDriverState *bs, QDict *options, int flags,
1711 Error **errp)
1712 {
1713 IscsiLun *iscsilun = bs->opaque;
1714 struct iscsi_context *iscsi = NULL;
1715 struct scsi_task *task = NULL;
1716 struct scsi_inquiry_standard *inq = NULL;
1717 struct scsi_inquiry_supported_pages *inq_vpd;
1718 char *initiator_name = NULL;
1719 QemuOpts *opts;
1720 Error *local_err = NULL;
1721 const char *transport_name, *portal, *target, *filename;
1722 #if LIBISCSI_API_VERSION >= (20160603)
1723 enum iscsi_transport_type transport;
1724 #endif
1725 int i, ret = 0, timeout = 0, lun;
1726
1727 /* If we are given a filename, parse the filename, with precedence given to
1728 * filename encoded options */
1729 filename = qdict_get_try_str(options, "filename");
1730 if (filename) {
1731 warn_report("'filename' option specified. "
1732 "This is an unsupported option, and may be deprecated "
1733 "in the future");
1734 iscsi_parse_filename(filename, options, &local_err);
1735 if (local_err) {
1736 ret = -EINVAL;
1737 error_propagate(errp, local_err);
1738 goto exit;
1739 }
1740 }
1741
1742 opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort);
1743 qemu_opts_absorb_qdict(opts, options, &local_err);
1744 if (local_err) {
1745 error_propagate(errp, local_err);
1746 ret = -EINVAL;
1747 goto out;
1748 }
1749
1750 transport_name = qemu_opt_get(opts, "transport");
1751 portal = qemu_opt_get(opts, "portal");
1752 target = qemu_opt_get(opts, "target");
1753 lun = qemu_opt_get_number(opts, "lun", 0);
1754
1755 if (!transport_name || !portal || !target) {
1756 error_setg(errp, "Need all of transport, portal and target options");
1757 ret = -EINVAL;
1758 goto out;
1759 }
1760
1761 if (!strcmp(transport_name, "tcp")) {
1762 #if LIBISCSI_API_VERSION >= (20160603)
1763 transport = TCP_TRANSPORT;
1764 } else if (!strcmp(transport_name, "iser")) {
1765 transport = ISER_TRANSPORT;
1766 #else
1767 /* TCP is what older libiscsi versions always use */
1768 #endif
1769 } else {
1770 error_setg(errp, "Unknown transport: %s", transport_name);
1771 ret = -EINVAL;
1772 goto out;
1773 }
1774
1775 memset(iscsilun, 0, sizeof(IscsiLun));
1776
1777 initiator_name = get_initiator_name(opts);
1778
1779 iscsi = iscsi_create_context(initiator_name);
1780 if (iscsi == NULL) {
1781 error_setg(errp, "iSCSI: Failed to create iSCSI context.");
1782 ret = -ENOMEM;
1783 goto out;
1784 }
1785 #if LIBISCSI_API_VERSION >= (20160603)
1786 if (iscsi_init_transport(iscsi, transport)) {
1787 error_setg(errp, ("Error initializing transport."));
1788 ret = -EINVAL;
1789 goto out;
1790 }
1791 #endif
1792 if (iscsi_set_targetname(iscsi, target)) {
1793 error_setg(errp, "iSCSI: Failed to set target name.");
1794 ret = -EINVAL;
1795 goto out;
1796 }
1797
1798 /* check if we got CHAP username/password via the options */
1799 apply_chap(iscsi, opts, &local_err);
1800 if (local_err != NULL) {
1801 error_propagate(errp, local_err);
1802 ret = -EINVAL;
1803 goto out;
1804 }
1805
1806 if (iscsi_set_session_type(iscsi, ISCSI_SESSION_NORMAL) != 0) {
1807 error_setg(errp, "iSCSI: Failed to set session type to normal.");
1808 ret = -EINVAL;
1809 goto out;
1810 }
1811
1812 /* check if we got HEADER_DIGEST via the options */
1813 apply_header_digest(iscsi, opts, &local_err);
1814 if (local_err != NULL) {
1815 error_propagate(errp, local_err);
1816 ret = -EINVAL;
1817 goto out;
1818 }
1819
1820 /* timeout handling is broken in libiscsi before 1.15.0 */
1821 timeout = qemu_opt_get_number(opts, "timeout", 0);
1822 #if LIBISCSI_API_VERSION >= 20150621
1823 iscsi_set_timeout(iscsi, timeout);
1824 #else
1825 if (timeout) {
1826 error_report("iSCSI: ignoring timeout value for libiscsi <1.15.0");
1827 }
1828 #endif
1829
1830 if (iscsi_full_connect_sync(iscsi, portal, lun) != 0) {
1831 error_setg(errp, "iSCSI: Failed to connect to LUN : %s",
1832 iscsi_get_error(iscsi));
1833 ret = -EINVAL;
1834 goto out;
1835 }
1836
1837 iscsilun->iscsi = iscsi;
1838 iscsilun->aio_context = bdrv_get_aio_context(bs);
1839 iscsilun->lun = lun;
1840 iscsilun->has_write_same = true;
1841
1842 task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 0, 0,
1843 (void **) &inq, errp);
1844 if (task == NULL) {
1845 ret = -EINVAL;
1846 goto out;
1847 }
1848 iscsilun->type = inq->periperal_device_type;
1849 scsi_free_scsi_task(task);
1850 task = NULL;
1851
1852 iscsi_modesense_sync(iscsilun);
1853 if (iscsilun->dpofua) {
1854 bs->supported_write_flags = BDRV_REQ_FUA;
1855 }
1856 bs->supported_zero_flags = BDRV_REQ_MAY_UNMAP;
1857
1858 /* Check the write protect flag of the LUN if we want to write */
1859 if (iscsilun->type == TYPE_DISK && (flags & BDRV_O_RDWR) &&
1860 iscsilun->write_protected) {
1861 error_setg(errp, "Cannot open a write protected LUN as read-write");
1862 ret = -EACCES;
1863 goto out;
1864 }
1865
1866 iscsi_readcapacity_sync(iscsilun, &local_err);
1867 if (local_err != NULL) {
1868 error_propagate(errp, local_err);
1869 ret = -EINVAL;
1870 goto out;
1871 }
1872 bs->total_sectors = sector_lun2qemu(iscsilun->num_blocks, iscsilun);
1873
1874 /* We don't have any emulation for devices other than disks and CD-ROMs, so
1875 * this must be sg ioctl compatible. We force it to be sg, otherwise qemu
1876 * will try to read from the device to guess the image format.
1877 */
1878 if (iscsilun->type != TYPE_DISK && iscsilun->type != TYPE_ROM) {
1879 bs->sg = true;
1880 }
1881
1882 task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1,
1883 SCSI_INQUIRY_PAGECODE_SUPPORTED_VPD_PAGES,
1884 (void **) &inq_vpd, errp);
1885 if (task == NULL) {
1886 ret = -EINVAL;
1887 goto out;
1888 }
1889 for (i = 0; i < inq_vpd->num_pages; i++) {
1890 struct scsi_task *inq_task;
1891 struct scsi_inquiry_logical_block_provisioning *inq_lbp;
1892 struct scsi_inquiry_block_limits *inq_bl;
1893 switch (inq_vpd->pages[i]) {
1894 case SCSI_INQUIRY_PAGECODE_LOGICAL_BLOCK_PROVISIONING:
1895 inq_task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1,
1896 SCSI_INQUIRY_PAGECODE_LOGICAL_BLOCK_PROVISIONING,
1897 (void **) &inq_lbp, errp);
1898 if (inq_task == NULL) {
1899 ret = -EINVAL;
1900 goto out;
1901 }
1902 memcpy(&iscsilun->lbp, inq_lbp,
1903 sizeof(struct scsi_inquiry_logical_block_provisioning));
1904 scsi_free_scsi_task(inq_task);
1905 break;
1906 case SCSI_INQUIRY_PAGECODE_BLOCK_LIMITS:
1907 inq_task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1,
1908 SCSI_INQUIRY_PAGECODE_BLOCK_LIMITS,
1909 (void **) &inq_bl, errp);
1910 if (inq_task == NULL) {
1911 ret = -EINVAL;
1912 goto out;
1913 }
1914 memcpy(&iscsilun->bl, inq_bl,
1915 sizeof(struct scsi_inquiry_block_limits));
1916 scsi_free_scsi_task(inq_task);
1917 break;
1918 default:
1919 break;
1920 }
1921 }
1922 scsi_free_scsi_task(task);
1923 task = NULL;
1924
1925 qemu_mutex_init(&iscsilun->mutex);
1926 iscsi_attach_aio_context(bs, iscsilun->aio_context);
1927
1928 /* Guess the internal cluster (page) size of the iscsi target by the means
1929 * of opt_unmap_gran. Transfer the unmap granularity only if it has a
1930 * reasonable size */
1931 if (iscsilun->bl.opt_unmap_gran * iscsilun->block_size >= 4 * 1024 &&
1932 iscsilun->bl.opt_unmap_gran * iscsilun->block_size <= 16 * 1024 * 1024) {
1933 iscsilun->cluster_sectors = (iscsilun->bl.opt_unmap_gran *
1934 iscsilun->block_size) >> BDRV_SECTOR_BITS;
1935 if (iscsilun->lbprz) {
1936 ret = iscsi_allocmap_init(iscsilun, bs->open_flags);
1937 }
1938 }
1939
1940 out:
1941 qemu_opts_del(opts);
1942 g_free(initiator_name);
1943 if (task != NULL) {
1944 scsi_free_scsi_task(task);
1945 }
1946
1947 if (ret) {
1948 if (iscsi != NULL) {
1949 if (iscsi_is_logged_in(iscsi)) {
1950 iscsi_logout_sync(iscsi);
1951 }
1952 iscsi_destroy_context(iscsi);
1953 }
1954 memset(iscsilun, 0, sizeof(IscsiLun));
1955 }
1956 exit:
1957 return ret;
1958 }
1959
1960 static void iscsi_close(BlockDriverState *bs)
1961 {
1962 IscsiLun *iscsilun = bs->opaque;
1963 struct iscsi_context *iscsi = iscsilun->iscsi;
1964
1965 iscsi_detach_aio_context(bs);
1966 if (iscsi_is_logged_in(iscsi)) {
1967 iscsi_logout_sync(iscsi);
1968 }
1969 iscsi_destroy_context(iscsi);
1970 g_free(iscsilun->zeroblock);
1971 iscsi_allocmap_free(iscsilun);
1972 qemu_mutex_destroy(&iscsilun->mutex);
1973 memset(iscsilun, 0, sizeof(IscsiLun));
1974 }
1975
1976 static void iscsi_refresh_limits(BlockDriverState *bs, Error **errp)
1977 {
1978 /* We don't actually refresh here, but just return data queried in
1979 * iscsi_open(): iscsi targets don't change their limits. */
1980
1981 IscsiLun *iscsilun = bs->opaque;
1982 uint64_t max_xfer_len = iscsilun->use_16_for_rw ? 0xffffffff : 0xffff;
1983 unsigned int block_size = MAX(BDRV_SECTOR_SIZE, iscsilun->block_size);
1984
1985 assert(iscsilun->block_size >= BDRV_SECTOR_SIZE || bs->sg);
1986
1987 bs->bl.request_alignment = block_size;
1988
1989 if (iscsilun->bl.max_xfer_len) {
1990 max_xfer_len = MIN(max_xfer_len, iscsilun->bl.max_xfer_len);
1991 }
1992
1993 if (max_xfer_len * block_size < INT_MAX) {
1994 bs->bl.max_transfer = max_xfer_len * iscsilun->block_size;
1995 }
1996
1997 if (iscsilun->lbp.lbpu) {
1998 if (iscsilun->bl.max_unmap < 0xffffffff / block_size) {
1999 bs->bl.max_pdiscard =
2000 iscsilun->bl.max_unmap * iscsilun->block_size;
2001 }
2002 bs->bl.pdiscard_alignment =
2003 iscsilun->bl.opt_unmap_gran * iscsilun->block_size;
2004 } else {
2005 bs->bl.pdiscard_alignment = iscsilun->block_size;
2006 }
2007
2008 if (iscsilun->bl.max_ws_len < 0xffffffff / block_size) {
2009 bs->bl.max_pwrite_zeroes =
2010 iscsilun->bl.max_ws_len * iscsilun->block_size;
2011 }
2012 if (iscsilun->lbp.lbpws) {
2013 bs->bl.pwrite_zeroes_alignment =
2014 iscsilun->bl.opt_unmap_gran * iscsilun->block_size;
2015 } else {
2016 bs->bl.pwrite_zeroes_alignment = iscsilun->block_size;
2017 }
2018 if (iscsilun->bl.opt_xfer_len &&
2019 iscsilun->bl.opt_xfer_len < INT_MAX / block_size) {
2020 bs->bl.opt_transfer = pow2floor(iscsilun->bl.opt_xfer_len *
2021 iscsilun->block_size);
2022 }
2023 }
2024
2025 /* Note that this will not re-establish a connection with an iSCSI target - it
2026 * is effectively a NOP. */
2027 static int iscsi_reopen_prepare(BDRVReopenState *state,
2028 BlockReopenQueue *queue, Error **errp)
2029 {
2030 IscsiLun *iscsilun = state->bs->opaque;
2031
2032 if (state->flags & BDRV_O_RDWR && iscsilun->write_protected) {
2033 error_setg(errp, "Cannot open a write protected LUN as read-write");
2034 return -EACCES;
2035 }
2036 return 0;
2037 }
2038
2039 static void iscsi_reopen_commit(BDRVReopenState *reopen_state)
2040 {
2041 IscsiLun *iscsilun = reopen_state->bs->opaque;
2042
2043 /* the cache.direct status might have changed */
2044 if (iscsilun->allocmap != NULL) {
2045 iscsi_allocmap_init(iscsilun, reopen_state->flags);
2046 }
2047 }
2048
2049 static int iscsi_truncate(BlockDriverState *bs, int64_t offset,
2050 PreallocMode prealloc, Error **errp)
2051 {
2052 IscsiLun *iscsilun = bs->opaque;
2053 Error *local_err = NULL;
2054
2055 if (prealloc != PREALLOC_MODE_OFF) {
2056 error_setg(errp, "Unsupported preallocation mode '%s'",
2057 PreallocMode_str(prealloc));
2058 return -ENOTSUP;
2059 }
2060
2061 if (iscsilun->type != TYPE_DISK) {
2062 error_setg(errp, "Cannot resize non-disk iSCSI devices");
2063 return -ENOTSUP;
2064 }
2065
2066 iscsi_readcapacity_sync(iscsilun, &local_err);
2067 if (local_err != NULL) {
2068 error_propagate(errp, local_err);
2069 return -EIO;
2070 }
2071
2072 if (offset > iscsi_getlength(bs)) {
2073 error_setg(errp, "Cannot grow iSCSI devices");
2074 return -EINVAL;
2075 }
2076
2077 if (iscsilun->allocmap != NULL) {
2078 iscsi_allocmap_init(iscsilun, bs->open_flags);
2079 }
2080
2081 return 0;
2082 }
2083
2084 static int iscsi_create(const char *filename, QemuOpts *opts, Error **errp)
2085 {
2086 int ret = 0;
2087 int64_t total_size = 0;
2088 BlockDriverState *bs;
2089 IscsiLun *iscsilun = NULL;
2090 QDict *bs_options;
2091 Error *local_err = NULL;
2092
2093 bs = bdrv_new();
2094
2095 /* Read out options */
2096 total_size = DIV_ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0),
2097 BDRV_SECTOR_SIZE);
2098 bs->opaque = g_new0(struct IscsiLun, 1);
2099 iscsilun = bs->opaque;
2100
2101 bs_options = qdict_new();
2102 iscsi_parse_filename(filename, bs_options, &local_err);
2103 if (local_err) {
2104 error_propagate(errp, local_err);
2105 ret = -EINVAL;
2106 } else {
2107 ret = iscsi_open(bs, bs_options, 0, NULL);
2108 }
2109 QDECREF(bs_options);
2110
2111 if (ret != 0) {
2112 goto out;
2113 }
2114 iscsi_detach_aio_context(bs);
2115 if (iscsilun->type != TYPE_DISK) {
2116 ret = -ENODEV;
2117 goto out;
2118 }
2119 if (bs->total_sectors < total_size) {
2120 ret = -ENOSPC;
2121 goto out;
2122 }
2123
2124 ret = 0;
2125 out:
2126 if (iscsilun->iscsi != NULL) {
2127 iscsi_destroy_context(iscsilun->iscsi);
2128 }
2129 g_free(bs->opaque);
2130 bs->opaque = NULL;
2131 bdrv_unref(bs);
2132 return ret;
2133 }
2134
2135 static int iscsi_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
2136 {
2137 IscsiLun *iscsilun = bs->opaque;
2138 bdi->unallocated_blocks_are_zero = iscsilun->lbprz;
2139 bdi->can_write_zeroes_with_unmap = iscsilun->lbprz && iscsilun->lbp.lbpws;
2140 bdi->cluster_size = iscsilun->cluster_sectors * BDRV_SECTOR_SIZE;
2141 return 0;
2142 }
2143
2144 static void iscsi_invalidate_cache(BlockDriverState *bs,
2145 Error **errp)
2146 {
2147 IscsiLun *iscsilun = bs->opaque;
2148 iscsi_allocmap_invalidate(iscsilun);
2149 }
2150
2151 static QemuOptsList iscsi_create_opts = {
2152 .name = "iscsi-create-opts",
2153 .head = QTAILQ_HEAD_INITIALIZER(iscsi_create_opts.head),
2154 .desc = {
2155 {
2156 .name = BLOCK_OPT_SIZE,
2157 .type = QEMU_OPT_SIZE,
2158 .help = "Virtual disk size"
2159 },
2160 { /* end of list */ }
2161 }
2162 };
2163
2164 static BlockDriver bdrv_iscsi = {
2165 .format_name = "iscsi",
2166 .protocol_name = "iscsi",
2167
2168 .instance_size = sizeof(IscsiLun),
2169 .bdrv_parse_filename = iscsi_parse_filename,
2170 .bdrv_file_open = iscsi_open,
2171 .bdrv_close = iscsi_close,
2172 .bdrv_create = iscsi_create,
2173 .create_opts = &iscsi_create_opts,
2174 .bdrv_reopen_prepare = iscsi_reopen_prepare,
2175 .bdrv_reopen_commit = iscsi_reopen_commit,
2176 .bdrv_invalidate_cache = iscsi_invalidate_cache,
2177
2178 .bdrv_getlength = iscsi_getlength,
2179 .bdrv_get_info = iscsi_get_info,
2180 .bdrv_truncate = iscsi_truncate,
2181 .bdrv_refresh_limits = iscsi_refresh_limits,
2182
2183 .bdrv_co_get_block_status = iscsi_co_get_block_status,
2184 .bdrv_co_pdiscard = iscsi_co_pdiscard,
2185 .bdrv_co_pwrite_zeroes = iscsi_co_pwrite_zeroes,
2186 .bdrv_co_readv = iscsi_co_readv,
2187 .bdrv_co_writev_flags = iscsi_co_writev_flags,
2188 .bdrv_co_flush_to_disk = iscsi_co_flush,
2189
2190 #ifdef __linux__
2191 .bdrv_aio_ioctl = iscsi_aio_ioctl,
2192 #endif
2193
2194 .bdrv_detach_aio_context = iscsi_detach_aio_context,
2195 .bdrv_attach_aio_context = iscsi_attach_aio_context,
2196 };
2197
2198 #if LIBISCSI_API_VERSION >= (20160603)
2199 static BlockDriver bdrv_iser = {
2200 .format_name = "iser",
2201 .protocol_name = "iser",
2202
2203 .instance_size = sizeof(IscsiLun),
2204 .bdrv_parse_filename = iscsi_parse_filename,
2205 .bdrv_file_open = iscsi_open,
2206 .bdrv_close = iscsi_close,
2207 .bdrv_create = iscsi_create,
2208 .create_opts = &iscsi_create_opts,
2209 .bdrv_reopen_prepare = iscsi_reopen_prepare,
2210 .bdrv_reopen_commit = iscsi_reopen_commit,
2211 .bdrv_invalidate_cache = iscsi_invalidate_cache,
2212
2213 .bdrv_getlength = iscsi_getlength,
2214 .bdrv_get_info = iscsi_get_info,
2215 .bdrv_truncate = iscsi_truncate,
2216 .bdrv_refresh_limits = iscsi_refresh_limits,
2217
2218 .bdrv_co_get_block_status = iscsi_co_get_block_status,
2219 .bdrv_co_pdiscard = iscsi_co_pdiscard,
2220 .bdrv_co_pwrite_zeroes = iscsi_co_pwrite_zeroes,
2221 .bdrv_co_readv = iscsi_co_readv,
2222 .bdrv_co_writev_flags = iscsi_co_writev_flags,
2223 .bdrv_co_flush_to_disk = iscsi_co_flush,
2224
2225 #ifdef __linux__
2226 .bdrv_aio_ioctl = iscsi_aio_ioctl,
2227 #endif
2228
2229 .bdrv_detach_aio_context = iscsi_detach_aio_context,
2230 .bdrv_attach_aio_context = iscsi_attach_aio_context,
2231 };
2232 #endif
2233
2234 static void iscsi_block_init(void)
2235 {
2236 bdrv_register(&bdrv_iscsi);
2237 #if LIBISCSI_API_VERSION >= (20160603)
2238 bdrv_register(&bdrv_iser);
2239 #endif
2240 }
2241
2242 block_init(iscsi_block_init);
QEmu