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net/cadence_gem: Prefetch rx descriptors ASAP
[qemu.git] / blockdev.c
blob44755e1a5d2f298d17073d5c4b19acb844bb2793
1 /*
2 * QEMU host block devices
3 *
4 * Copyright (c) 2003-2008 Fabrice Bellard
5 *
6 * This work is licensed under the terms of the GNU GPL, version 2 or
7 * later. See the COPYING file in the top-level directory.
8 *
9 * This file incorporates work covered by the following copyright and
10 * permission notice:
11 *
12 * Copyright (c) 2003-2008 Fabrice Bellard
13 *
14 * Permission is hereby granted, free of charge, to any person obtaining a copy
15 * of this software and associated documentation files (the "Software"), to deal
16 * in the Software without restriction, including without limitation the rights
17 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
18 * copies of the Software, and to permit persons to whom the Software is
19 * furnished to do so, subject to the following conditions:
20 *
21 * The above copyright notice and this permission notice shall be included in
22 * all copies or substantial portions of the Software.
23 *
24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
25 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
26 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
27 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
28 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
29 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
30 * THE SOFTWARE.
31 */
32
33 #include "sysemu/blockdev.h"
34 #include "hw/block/block.h"
35 #include "block/blockjob.h"
36 #include "monitor/monitor.h"
37 #include "qapi/qmp/qerror.h"
38 #include "qemu/option.h"
39 #include "qemu/config-file.h"
40 #include "qapi/qmp/types.h"
41 #include "qapi-visit.h"
42 #include "qapi/qmp-output-visitor.h"
43 #include "sysemu/sysemu.h"
44 #include "block/block_int.h"
45 #include "qmp-commands.h"
46 #include "trace.h"
47 #include "sysemu/arch_init.h"
48
49 static QTAILQ_HEAD(drivelist, DriveInfo) drives = QTAILQ_HEAD_INITIALIZER(drives);
50
51 static const char *const if_name[IF_COUNT] = {
52 [IF_NONE] = "none",
53 [IF_IDE] = "ide",
54 [IF_SCSI] = "scsi",
55 [IF_FLOPPY] = "floppy",
56 [IF_PFLASH] = "pflash",
57 [IF_MTD] = "mtd",
58 [IF_SD] = "sd",
59 [IF_VIRTIO] = "virtio",
60 [IF_XEN] = "xen",
61 };
62
63 static const int if_max_devs[IF_COUNT] = {
64 /*
65 * Do not change these numbers! They govern how drive option
66 * index maps to unit and bus. That mapping is ABI.
67 *
68 * All controllers used to imlement if=T drives need to support
69 * if_max_devs[T] units, for any T with if_max_devs[T] != 0.
70 * Otherwise, some index values map to "impossible" bus, unit
71 * values.
72 *
73 * For instance, if you change [IF_SCSI] to 255, -drive
74 * if=scsi,index=12 no longer means bus=1,unit=5, but
75 * bus=0,unit=12. With an lsi53c895a controller (7 units max),
76 * the drive can't be set up. Regression.
77 */
78 [IF_IDE] = 2,
79 [IF_SCSI] = 7,
80 };
81
82 /*
83 * We automatically delete the drive when a device using it gets
84 * unplugged. Questionable feature, but we can't just drop it.
85 * Device models call blockdev_mark_auto_del() to schedule the
86 * automatic deletion, and generic qdev code calls blockdev_auto_del()
87 * when deletion is actually safe.
88 */
89 void blockdev_mark_auto_del(BlockDriverState *bs)
90 {
91 DriveInfo *dinfo = drive_get_by_blockdev(bs);
92
93 if (dinfo && !dinfo->enable_auto_del) {
94 return;
95 }
96
97 if (bs->job) {
98 block_job_cancel(bs->job);
99 }
100 if (dinfo) {
101 dinfo->auto_del = 1;
102 }
103 }
104
105 void blockdev_auto_del(BlockDriverState *bs)
106 {
107 DriveInfo *dinfo = drive_get_by_blockdev(bs);
108
109 if (dinfo && dinfo->auto_del) {
110 drive_put_ref(dinfo);
111 }
112 }
113
114 static int drive_index_to_bus_id(BlockInterfaceType type, int index)
115 {
116 int max_devs = if_max_devs[type];
117 return max_devs ? index / max_devs : 0;
118 }
119
120 static int drive_index_to_unit_id(BlockInterfaceType type, int index)
121 {
122 int max_devs = if_max_devs[type];
123 return max_devs ? index % max_devs : index;
124 }
125
126 QemuOpts *drive_def(const char *optstr)
127 {
128 return qemu_opts_parse(qemu_find_opts("drive"), optstr, 0);
129 }
130
131 QemuOpts *drive_add(BlockInterfaceType type, int index, const char *file,
132 const char *optstr)
133 {
134 QemuOpts *opts;
135 char buf[32];
136
137 opts = drive_def(optstr);
138 if (!opts) {
139 return NULL;
140 }
141 if (type != IF_DEFAULT) {
142 qemu_opt_set(opts, "if", if_name[type]);
143 }
144 if (index >= 0) {
145 snprintf(buf, sizeof(buf), "%d", index);
146 qemu_opt_set(opts, "index", buf);
147 }
148 if (file)
149 qemu_opt_set(opts, "file", file);
150 return opts;
151 }
152
153 DriveInfo *drive_get(BlockInterfaceType type, int bus, int unit)
154 {
155 DriveInfo *dinfo;
156
157 /* seek interface, bus and unit */
158
159 QTAILQ_FOREACH(dinfo, &drives, next) {
160 if (dinfo->type == type &&
161 dinfo->bus == bus &&
162 dinfo->unit == unit)
163 return dinfo;
164 }
165
166 return NULL;
167 }
168
169 DriveInfo *drive_get_by_index(BlockInterfaceType type, int index)
170 {
171 return drive_get(type,
172 drive_index_to_bus_id(type, index),
173 drive_index_to_unit_id(type, index));
174 }
175
176 int drive_get_max_bus(BlockInterfaceType type)
177 {
178 int max_bus;
179 DriveInfo *dinfo;
180
181 max_bus = -1;
182 QTAILQ_FOREACH(dinfo, &drives, next) {
183 if(dinfo->type == type &&
184 dinfo->bus > max_bus)
185 max_bus = dinfo->bus;
186 }
187 return max_bus;
188 }
189
190 /* Get a block device. This should only be used for single-drive devices
191 (e.g. SD/Floppy/MTD). Multi-disk devices (scsi/ide) should use the
192 appropriate bus. */
193 DriveInfo *drive_get_next(BlockInterfaceType type)
194 {
195 static int next_block_unit[IF_COUNT];
196
197 return drive_get(type, 0, next_block_unit[type]++);
198 }
199
200 DriveInfo *drive_get_by_blockdev(BlockDriverState *bs)
201 {
202 DriveInfo *dinfo;
203
204 QTAILQ_FOREACH(dinfo, &drives, next) {
205 if (dinfo->bdrv == bs) {
206 return dinfo;
207 }
208 }
209 return NULL;
210 }
211
212 static void bdrv_format_print(void *opaque, const char *name)
213 {
214 error_printf(" %s", name);
215 }
216
217 static void drive_uninit(DriveInfo *dinfo)
218 {
219 if (dinfo->opts) {
220 qemu_opts_del(dinfo->opts);
221 }
222
223 bdrv_unref(dinfo->bdrv);
224 g_free(dinfo->id);
225 QTAILQ_REMOVE(&drives, dinfo, next);
226 g_free(dinfo->serial);
227 g_free(dinfo);
228 }
229
230 void drive_put_ref(DriveInfo *dinfo)
231 {
232 assert(dinfo->refcount);
233 if (--dinfo->refcount == 0) {
234 drive_uninit(dinfo);
235 }
236 }
237
238 void drive_get_ref(DriveInfo *dinfo)
239 {
240 dinfo->refcount++;
241 }
242
243 typedef struct {
244 QEMUBH *bh;
245 BlockDriverState *bs;
246 } BDRVPutRefBH;
247
248 static void bdrv_put_ref_bh(void *opaque)
249 {
250 BDRVPutRefBH *s = opaque;
251
252 bdrv_unref(s->bs);
253 qemu_bh_delete(s->bh);
254 g_free(s);
255 }
256
257 /*
258 * Release a BDS reference in a BH
259 *
260 * It is not safe to use bdrv_unref() from a callback function when the callers
261 * still need the BlockDriverState. In such cases we schedule a BH to release
262 * the reference.
263 */
264 static void bdrv_put_ref_bh_schedule(BlockDriverState *bs)
265 {
266 BDRVPutRefBH *s;
267
268 s = g_new(BDRVPutRefBH, 1);
269 s->bh = qemu_bh_new(bdrv_put_ref_bh, s);
270 s->bs = bs;
271 qemu_bh_schedule(s->bh);
272 }
273
274 static int parse_block_error_action(const char *buf, bool is_read, Error **errp)
275 {
276 if (!strcmp(buf, "ignore")) {
277 return BLOCKDEV_ON_ERROR_IGNORE;
278 } else if (!is_read && !strcmp(buf, "enospc")) {
279 return BLOCKDEV_ON_ERROR_ENOSPC;
280 } else if (!strcmp(buf, "stop")) {
281 return BLOCKDEV_ON_ERROR_STOP;
282 } else if (!strcmp(buf, "report")) {
283 return BLOCKDEV_ON_ERROR_REPORT;
284 } else {
285 error_setg(errp, "'%s' invalid %s error action",
286 buf, is_read ? "read" : "write");
287 return -1;
288 }
289 }
290
291 static bool check_throttle_config(ThrottleConfig *cfg, Error **errp)
292 {
293 if (throttle_conflicting(cfg)) {
294 error_setg(errp, "bps/iops/max total values and read/write values"
295 " cannot be used at the same time");
296 return false;
297 }
298
299 if (!throttle_is_valid(cfg)) {
300 error_setg(errp, "bps/iops/maxs values must be 0 or greater");
301 return false;
302 }
303
304 return true;
305 }
306
307 typedef enum { MEDIA_DISK, MEDIA_CDROM } DriveMediaType;
308
309 /* Takes the ownership of bs_opts */
310 static DriveInfo *blockdev_init(QDict *bs_opts,
311 BlockInterfaceType type,
312 Error **errp)
313 {
314 const char *buf;
315 const char *file = NULL;
316 const char *serial;
317 int ro = 0;
318 int bdrv_flags = 0;
319 int on_read_error, on_write_error;
320 DriveInfo *dinfo;
321 ThrottleConfig cfg;
322 int snapshot = 0;
323 bool copy_on_read;
324 int ret;
325 Error *error = NULL;
326 QemuOpts *opts;
327 const char *id;
328 bool has_driver_specific_opts;
329 BlockDriver *drv = NULL;
330
331 /* Check common options by copying from bs_opts to opts, all other options
332 * stay in bs_opts for processing by bdrv_open(). */
333 id = qdict_get_try_str(bs_opts, "id");
334 opts = qemu_opts_create(&qemu_common_drive_opts, id, 1, &error);
335 if (error_is_set(&error)) {
336 error_propagate(errp, error);
337 return NULL;
338 }
339
340 qemu_opts_absorb_qdict(opts, bs_opts, &error);
341 if (error_is_set(&error)) {
342 error_propagate(errp, error);
343 goto early_err;
344 }
345
346 if (id) {
347 qdict_del(bs_opts, "id");
348 }
349
350 has_driver_specific_opts = !!qdict_size(bs_opts);
351
352 /* extract parameters */
353 snapshot = qemu_opt_get_bool(opts, "snapshot", 0);
354 ro = qemu_opt_get_bool(opts, "read-only", 0);
355 copy_on_read = qemu_opt_get_bool(opts, "copy-on-read", false);
356
357 file = qemu_opt_get(opts, "file");
358 serial = qemu_opt_get(opts, "serial");
359
360 if ((buf = qemu_opt_get(opts, "discard")) != NULL) {
361 if (bdrv_parse_discard_flags(buf, &bdrv_flags) != 0) {
362 error_setg(errp, "invalid discard option");
363 goto early_err;
364 }
365 }
366
367 if (qemu_opt_get_bool(opts, "cache.writeback", true)) {
368 bdrv_flags |= BDRV_O_CACHE_WB;
369 }
370 if (qemu_opt_get_bool(opts, "cache.direct", false)) {
371 bdrv_flags |= BDRV_O_NOCACHE;
372 }
373 if (qemu_opt_get_bool(opts, "cache.no-flush", false)) {
374 bdrv_flags |= BDRV_O_NO_FLUSH;
375 }
376
377 #ifdef CONFIG_LINUX_AIO
378 if ((buf = qemu_opt_get(opts, "aio")) != NULL) {
379 if (!strcmp(buf, "native")) {
380 bdrv_flags |= BDRV_O_NATIVE_AIO;
381 } else if (!strcmp(buf, "threads")) {
382 /* this is the default */
383 } else {
384 error_setg(errp, "invalid aio option");
385 goto early_err;
386 }
387 }
388 #endif
389
390 if ((buf = qemu_opt_get(opts, "format")) != NULL) {
391 if (is_help_option(buf)) {
392 error_printf("Supported formats:");
393 bdrv_iterate_format(bdrv_format_print, NULL);
394 error_printf("\n");
395 goto early_err;
396 }
397
398 drv = bdrv_find_format(buf);
399 if (!drv) {
400 error_setg(errp, "'%s' invalid format", buf);
401 goto early_err;
402 }
403 }
404
405 /* disk I/O throttling */
406 memset(&cfg, 0, sizeof(cfg));
407 cfg.buckets[THROTTLE_BPS_TOTAL].avg =
408 qemu_opt_get_number(opts, "throttling.bps-total", 0);
409 cfg.buckets[THROTTLE_BPS_READ].avg =
410 qemu_opt_get_number(opts, "throttling.bps-read", 0);
411 cfg.buckets[THROTTLE_BPS_WRITE].avg =
412 qemu_opt_get_number(opts, "throttling.bps-write", 0);
413 cfg.buckets[THROTTLE_OPS_TOTAL].avg =
414 qemu_opt_get_number(opts, "throttling.iops-total", 0);
415 cfg.buckets[THROTTLE_OPS_READ].avg =
416 qemu_opt_get_number(opts, "throttling.iops-read", 0);
417 cfg.buckets[THROTTLE_OPS_WRITE].avg =
418 qemu_opt_get_number(opts, "throttling.iops-write", 0);
419
420 cfg.buckets[THROTTLE_BPS_TOTAL].max =
421 qemu_opt_get_number(opts, "throttling.bps-total-max", 0);
422 cfg.buckets[THROTTLE_BPS_READ].max =
423 qemu_opt_get_number(opts, "throttling.bps-read-max", 0);
424 cfg.buckets[THROTTLE_BPS_WRITE].max =
425 qemu_opt_get_number(opts, "throttling.bps-write-max", 0);
426 cfg.buckets[THROTTLE_OPS_TOTAL].max =
427 qemu_opt_get_number(opts, "throttling.iops-total-max", 0);
428 cfg.buckets[THROTTLE_OPS_READ].max =
429 qemu_opt_get_number(opts, "throttling.iops-read-max", 0);
430 cfg.buckets[THROTTLE_OPS_WRITE].max =
431 qemu_opt_get_number(opts, "throttling.iops-write-max", 0);
432
433 cfg.op_size = qemu_opt_get_number(opts, "throttling.iops-size", 0);
434
435 if (!check_throttle_config(&cfg, &error)) {
436 error_propagate(errp, error);
437 goto early_err;
438 }
439
440 on_write_error = BLOCKDEV_ON_ERROR_ENOSPC;
441 if ((buf = qemu_opt_get(opts, "werror")) != NULL) {
442 if (type != IF_IDE && type != IF_SCSI && type != IF_VIRTIO && type != IF_NONE) {
443 error_setg(errp, "werror is not supported by this bus type");
444 goto early_err;
445 }
446
447 on_write_error = parse_block_error_action(buf, 0, &error);
448 if (error_is_set(&error)) {
449 error_propagate(errp, error);
450 goto early_err;
451 }
452 }
453
454 on_read_error = BLOCKDEV_ON_ERROR_REPORT;
455 if ((buf = qemu_opt_get(opts, "rerror")) != NULL) {
456 if (type != IF_IDE && type != IF_VIRTIO && type != IF_SCSI && type != IF_NONE) {
457 error_report("rerror is not supported by this bus type");
458 goto early_err;
459 }
460
461 on_read_error = parse_block_error_action(buf, 1, &error);
462 if (error_is_set(&error)) {
463 error_propagate(errp, error);
464 goto early_err;
465 }
466 }
467
468 /* init */
469 dinfo = g_malloc0(sizeof(*dinfo));
470 dinfo->id = g_strdup(qemu_opts_id(opts));
471 dinfo->bdrv = bdrv_new(dinfo->id);
472 dinfo->bdrv->open_flags = snapshot ? BDRV_O_SNAPSHOT : 0;
473 dinfo->bdrv->read_only = ro;
474 dinfo->type = type;
475 dinfo->refcount = 1;
476 if (serial != NULL) {
477 dinfo->serial = g_strdup(serial);
478 }
479 QTAILQ_INSERT_TAIL(&drives, dinfo, next);
480
481 bdrv_set_on_error(dinfo->bdrv, on_read_error, on_write_error);
482
483 /* disk I/O throttling */
484 if (throttle_enabled(&cfg)) {
485 bdrv_io_limits_enable(dinfo->bdrv);
486 bdrv_set_io_limits(dinfo->bdrv, &cfg);
487 }
488
489 if (!file || !*file) {
490 if (has_driver_specific_opts) {
491 file = NULL;
492 } else {
493 QDECREF(bs_opts);
494 qemu_opts_del(opts);
495 return dinfo;
496 }
497 }
498 if (snapshot) {
499 /* always use cache=unsafe with snapshot */
500 bdrv_flags &= ~BDRV_O_CACHE_MASK;
501 bdrv_flags |= (BDRV_O_SNAPSHOT|BDRV_O_CACHE_WB|BDRV_O_NO_FLUSH);
502 }
503
504 if (copy_on_read) {
505 bdrv_flags |= BDRV_O_COPY_ON_READ;
506 }
507
508 if (runstate_check(RUN_STATE_INMIGRATE)) {
509 bdrv_flags |= BDRV_O_INCOMING;
510 }
511
512 bdrv_flags |= ro ? 0 : BDRV_O_RDWR;
513
514 QINCREF(bs_opts);
515 ret = bdrv_open(dinfo->bdrv, file, bs_opts, bdrv_flags, drv, &error);
516
517 if (ret < 0) {
518 error_setg(errp, "could not open disk image %s: %s",
519 file ?: dinfo->id, error_get_pretty(error));
520 error_free(error);
521 goto err;
522 }
523
524 if (bdrv_key_required(dinfo->bdrv))
525 autostart = 0;
526
527 QDECREF(bs_opts);
528 qemu_opts_del(opts);
529
530 return dinfo;
531
532 err:
533 bdrv_unref(dinfo->bdrv);
534 g_free(dinfo->id);
535 QTAILQ_REMOVE(&drives, dinfo, next);
536 g_free(dinfo);
537 early_err:
538 QDECREF(bs_opts);
539 qemu_opts_del(opts);
540 return NULL;
541 }
542
543 static void qemu_opt_rename(QemuOpts *opts, const char *from, const char *to)
544 {
545 const char *value;
546
547 value = qemu_opt_get(opts, from);
548 if (value) {
549 qemu_opt_set(opts, to, value);
550 qemu_opt_unset(opts, from);
551 }
552 }
553
554 QemuOptsList qemu_legacy_drive_opts = {
555 .name = "drive",
556 .head = QTAILQ_HEAD_INITIALIZER(qemu_legacy_drive_opts.head),
557 .desc = {
558 {
559 .name = "bus",
560 .type = QEMU_OPT_NUMBER,
561 .help = "bus number",
562 },{
563 .name = "unit",
564 .type = QEMU_OPT_NUMBER,
565 .help = "unit number (i.e. lun for scsi)",
566 },{
567 .name = "index",
568 .type = QEMU_OPT_NUMBER,
569 .help = "index number",
570 },{
571 .name = "media",
572 .type = QEMU_OPT_STRING,
573 .help = "media type (disk, cdrom)",
574 },{
575 .name = "if",
576 .type = QEMU_OPT_STRING,
577 .help = "interface (ide, scsi, sd, mtd, floppy, pflash, virtio)",
578 },{
579 .name = "cyls",
580 .type = QEMU_OPT_NUMBER,
581 .help = "number of cylinders (ide disk geometry)",
582 },{
583 .name = "heads",
584 .type = QEMU_OPT_NUMBER,
585 .help = "number of heads (ide disk geometry)",
586 },{
587 .name = "secs",
588 .type = QEMU_OPT_NUMBER,
589 .help = "number of sectors (ide disk geometry)",
590 },{
591 .name = "trans",
592 .type = QEMU_OPT_STRING,
593 .help = "chs translation (auto, lba, none)",
594 },{
595 .name = "boot",
596 .type = QEMU_OPT_BOOL,
597 .help = "(deprecated, ignored)",
598 },{
599 .name = "addr",
600 .type = QEMU_OPT_STRING,
601 .help = "pci address (virtio only)",
602 },
603
604 /* Options that are passed on, but have special semantics with -drive */
605 {
606 .name = "read-only",
607 .type = QEMU_OPT_BOOL,
608 .help = "open drive file as read-only",
609 },{
610 .name = "copy-on-read",
611 .type = QEMU_OPT_BOOL,
612 .help = "copy read data from backing file into image file",
613 },
614
615 { /* end of list */ }
616 },
617 };
618
619 DriveInfo *drive_init(QemuOpts *all_opts, BlockInterfaceType block_default_type)
620 {
621 const char *value;
622 DriveInfo *dinfo = NULL;
623 QDict *bs_opts;
624 QemuOpts *legacy_opts;
625 DriveMediaType media = MEDIA_DISK;
626 BlockInterfaceType type;
627 int cyls, heads, secs, translation;
628 int max_devs, bus_id, unit_id, index;
629 const char *devaddr;
630 bool read_only = false;
631 bool copy_on_read;
632 Error *local_err = NULL;
633
634 /* Change legacy command line options into QMP ones */
635 qemu_opt_rename(all_opts, "iops", "throttling.iops-total");
636 qemu_opt_rename(all_opts, "iops_rd", "throttling.iops-read");
637 qemu_opt_rename(all_opts, "iops_wr", "throttling.iops-write");
638
639 qemu_opt_rename(all_opts, "bps", "throttling.bps-total");
640 qemu_opt_rename(all_opts, "bps_rd", "throttling.bps-read");
641 qemu_opt_rename(all_opts, "bps_wr", "throttling.bps-write");
642
643 qemu_opt_rename(all_opts, "iops_max", "throttling.iops-total-max");
644 qemu_opt_rename(all_opts, "iops_rd_max", "throttling.iops-read-max");
645 qemu_opt_rename(all_opts, "iops_wr_max", "throttling.iops-write-max");
646
647 qemu_opt_rename(all_opts, "bps_max", "throttling.bps-total-max");
648 qemu_opt_rename(all_opts, "bps_rd_max", "throttling.bps-read-max");
649 qemu_opt_rename(all_opts, "bps_wr_max", "throttling.bps-write-max");
650
651 qemu_opt_rename(all_opts,
652 "iops_size", "throttling.iops-size");
653
654 qemu_opt_rename(all_opts, "readonly", "read-only");
655
656 value = qemu_opt_get(all_opts, "cache");
657 if (value) {
658 int flags = 0;
659
660 if (bdrv_parse_cache_flags(value, &flags) != 0) {
661 error_report("invalid cache option");
662 return NULL;
663 }
664
665 /* Specific options take precedence */
666 if (!qemu_opt_get(all_opts, "cache.writeback")) {
667 qemu_opt_set_bool(all_opts, "cache.writeback",
668 !!(flags & BDRV_O_CACHE_WB));
669 }
670 if (!qemu_opt_get(all_opts, "cache.direct")) {
671 qemu_opt_set_bool(all_opts, "cache.direct",
672 !!(flags & BDRV_O_NOCACHE));
673 }
674 if (!qemu_opt_get(all_opts, "cache.no-flush")) {
675 qemu_opt_set_bool(all_opts, "cache.no-flush",
676 !!(flags & BDRV_O_NO_FLUSH));
677 }
678 qemu_opt_unset(all_opts, "cache");
679 }
680
681 /* Get a QDict for processing the options */
682 bs_opts = qdict_new();
683 qemu_opts_to_qdict(all_opts, bs_opts);
684
685 legacy_opts = qemu_opts_create_nofail(&qemu_legacy_drive_opts);
686 qemu_opts_absorb_qdict(legacy_opts, bs_opts, &local_err);
687 if (error_is_set(&local_err)) {
688 qerror_report_err(local_err);
689 error_free(local_err);
690 goto fail;
691 }
692
693 /* Deprecated option boot=[on|off] */
694 if (qemu_opt_get(legacy_opts, "boot") != NULL) {
695 fprintf(stderr, "qemu-kvm: boot=on|off is deprecated and will be "
696 "ignored. Future versions will reject this parameter. Please "
697 "update your scripts.\n");
698 }
699
700 /* Media type */
701 value = qemu_opt_get(legacy_opts, "media");
702 if (value) {
703 if (!strcmp(value, "disk")) {
704 media = MEDIA_DISK;
705 } else if (!strcmp(value, "cdrom")) {
706 media = MEDIA_CDROM;
707 read_only = true;
708 } else {
709 error_report("'%s' invalid media", value);
710 goto fail;
711 }
712 }
713
714 /* copy-on-read is disabled with a warning for read-only devices */
715 read_only |= qemu_opt_get_bool(legacy_opts, "read-only", false);
716 copy_on_read = qemu_opt_get_bool(legacy_opts, "copy-on-read", false);
717
718 if (read_only && copy_on_read) {
719 error_report("warning: disabling copy-on-read on read-only drive");
720 copy_on_read = false;
721 }
722
723 qdict_put(bs_opts, "read-only",
724 qstring_from_str(read_only ? "on" : "off"));
725 qdict_put(bs_opts, "copy-on-read",
726 qstring_from_str(copy_on_read ? "on" :"off"));
727
728 /* Controller type */
729 value = qemu_opt_get(legacy_opts, "if");
730 if (value) {
731 for (type = 0;
732 type < IF_COUNT && strcmp(value, if_name[type]);
733 type++) {
734 }
735 if (type == IF_COUNT) {
736 error_report("unsupported bus type '%s'", value);
737 goto fail;
738 }
739 } else {
740 type = block_default_type;
741 }
742
743 /* Geometry */
744 cyls = qemu_opt_get_number(legacy_opts, "cyls", 0);
745 heads = qemu_opt_get_number(legacy_opts, "heads", 0);
746 secs = qemu_opt_get_number(legacy_opts, "secs", 0);
747
748 if (cyls || heads || secs) {
749 if (cyls < 1) {
750 error_report("invalid physical cyls number");
751 goto fail;
752 }
753 if (heads < 1) {
754 error_report("invalid physical heads number");
755 goto fail;
756 }
757 if (secs < 1) {
758 error_report("invalid physical secs number");
759 goto fail;
760 }
761 }
762
763 translation = BIOS_ATA_TRANSLATION_AUTO;
764 value = qemu_opt_get(legacy_opts, "trans");
765 if (value != NULL) {
766 if (!cyls) {
767 error_report("'%s' trans must be used with cyls, heads and secs",
768 value);
769 goto fail;
770 }
771 if (!strcmp(value, "none")) {
772 translation = BIOS_ATA_TRANSLATION_NONE;
773 } else if (!strcmp(value, "lba")) {
774 translation = BIOS_ATA_TRANSLATION_LBA;
775 } else if (!strcmp(value, "auto")) {
776 translation = BIOS_ATA_TRANSLATION_AUTO;
777 } else {
778 error_report("'%s' invalid translation type", value);
779 goto fail;
780 }
781 }
782
783 if (media == MEDIA_CDROM) {
784 if (cyls || secs || heads) {
785 error_report("CHS can't be set with media=cdrom");
786 goto fail;
787 }
788 }
789
790 /* Device address specified by bus/unit or index.
791 * If none was specified, try to find the first free one. */
792 bus_id = qemu_opt_get_number(legacy_opts, "bus", 0);
793 unit_id = qemu_opt_get_number(legacy_opts, "unit", -1);
794 index = qemu_opt_get_number(legacy_opts, "index", -1);
795
796 max_devs = if_max_devs[type];
797
798 if (index != -1) {
799 if (bus_id != 0 || unit_id != -1) {
800 error_report("index cannot be used with bus and unit");
801 goto fail;
802 }
803 bus_id = drive_index_to_bus_id(type, index);
804 unit_id = drive_index_to_unit_id(type, index);
805 }
806
807 if (unit_id == -1) {
808 unit_id = 0;
809 while (drive_get(type, bus_id, unit_id) != NULL) {
810 unit_id++;
811 if (max_devs && unit_id >= max_devs) {
812 unit_id -= max_devs;
813 bus_id++;
814 }
815 }
816 }
817
818 if (max_devs && unit_id >= max_devs) {
819 error_report("unit %d too big (max is %d)", unit_id, max_devs - 1);
820 goto fail;
821 }
822
823 if (drive_get(type, bus_id, unit_id) != NULL) {
824 error_report("drive with bus=%d, unit=%d (index=%d) exists",
825 bus_id, unit_id, index);
826 goto fail;
827 }
828
829 /* no id supplied -> create one */
830 if (qemu_opts_id(all_opts) == NULL) {
831 char *new_id;
832 const char *mediastr = "";
833 if (type == IF_IDE || type == IF_SCSI) {
834 mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd";
835 }
836 if (max_devs) {
837 new_id = g_strdup_printf("%s%i%s%i", if_name[type], bus_id,
838 mediastr, unit_id);
839 } else {
840 new_id = g_strdup_printf("%s%s%i", if_name[type],
841 mediastr, unit_id);
842 }
843 qdict_put(bs_opts, "id", qstring_from_str(new_id));
844 g_free(new_id);
845 }
846
847 /* Add virtio block device */
848 devaddr = qemu_opt_get(legacy_opts, "addr");
849 if (devaddr && type != IF_VIRTIO) {
850 error_report("addr is not supported by this bus type");
851 goto fail;
852 }
853
854 if (type == IF_VIRTIO) {
855 QemuOpts *devopts;
856 devopts = qemu_opts_create_nofail(qemu_find_opts("device"));
857 if (arch_type == QEMU_ARCH_S390X) {
858 qemu_opt_set(devopts, "driver", "virtio-blk-s390");
859 } else {
860 qemu_opt_set(devopts, "driver", "virtio-blk-pci");
861 }
862 qemu_opt_set(devopts, "drive", qdict_get_str(bs_opts, "id"));
863 if (devaddr) {
864 qemu_opt_set(devopts, "addr", devaddr);
865 }
866 }
867
868 /* Actual block device init: Functionality shared with blockdev-add */
869 dinfo = blockdev_init(bs_opts, type, &local_err);
870 if (dinfo == NULL) {
871 if (error_is_set(&local_err)) {
872 qerror_report_err(local_err);
873 error_free(local_err);
874 }
875 goto fail;
876 } else {
877 assert(!error_is_set(&local_err));
878 }
879
880 /* Set legacy DriveInfo fields */
881 dinfo->enable_auto_del = true;
882 dinfo->opts = all_opts;
883
884 dinfo->cyls = cyls;
885 dinfo->heads = heads;
886 dinfo->secs = secs;
887 dinfo->trans = translation;
888
889 dinfo->bus = bus_id;
890 dinfo->unit = unit_id;
891 dinfo->devaddr = devaddr;
892
893 switch(type) {
894 case IF_IDE:
895 case IF_SCSI:
896 case IF_XEN:
897 case IF_NONE:
898 dinfo->media_cd = media == MEDIA_CDROM;
899 break;
900 default:
901 break;
902 }
903
904 fail:
905 qemu_opts_del(legacy_opts);
906 return dinfo;
907 }
908
909 void do_commit(Monitor *mon, const QDict *qdict)
910 {
911 const char *device = qdict_get_str(qdict, "device");
912 BlockDriverState *bs;
913 int ret;
914
915 if (!strcmp(device, "all")) {
916 ret = bdrv_commit_all();
917 } else {
918 bs = bdrv_find(device);
919 if (!bs) {
920 monitor_printf(mon, "Device '%s' not found\n", device);
921 return;
922 }
923 ret = bdrv_commit(bs);
924 }
925 if (ret < 0) {
926 monitor_printf(mon, "'commit' error for '%s': %s\n", device,
927 strerror(-ret));
928 }
929 }
930
931 static void blockdev_do_action(int kind, void *data, Error **errp)
932 {
933 TransactionAction action;
934 TransactionActionList list;
935
936 action.kind = kind;
937 action.data = data;
938 list.value = &action;
939 list.next = NULL;
940 qmp_transaction(&list, errp);
941 }
942
943 void qmp_blockdev_snapshot_sync(const char *device, const char *snapshot_file,
944 bool has_format, const char *format,
945 bool has_mode, enum NewImageMode mode,
946 Error **errp)
947 {
948 BlockdevSnapshot snapshot = {
949 .device = (char *) device,
950 .snapshot_file = (char *) snapshot_file,
951 .has_format = has_format,
952 .format = (char *) format,
953 .has_mode = has_mode,
954 .mode = mode,
955 };
956 blockdev_do_action(TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC,
957 &snapshot, errp);
958 }
959
960 void qmp_blockdev_snapshot_internal_sync(const char *device,
961 const char *name,
962 Error **errp)
963 {
964 BlockdevSnapshotInternal snapshot = {
965 .device = (char *) device,
966 .name = (char *) name
967 };
968
969 blockdev_do_action(TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC,
970 &snapshot, errp);
971 }
972
973 SnapshotInfo *qmp_blockdev_snapshot_delete_internal_sync(const char *device,
974 bool has_id,
975 const char *id,
976 bool has_name,
977 const char *name,
978 Error **errp)
979 {
980 BlockDriverState *bs = bdrv_find(device);
981 QEMUSnapshotInfo sn;
982 Error *local_err = NULL;
983 SnapshotInfo *info = NULL;
984 int ret;
985
986 if (!bs) {
987 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
988 return NULL;
989 }
990
991 if (!has_id) {
992 id = NULL;
993 }
994
995 if (!has_name) {
996 name = NULL;
997 }
998
999 if (!id && !name) {
1000 error_setg(errp, "Name or id must be provided");
1001 return NULL;
1002 }
1003
1004 ret = bdrv_snapshot_find_by_id_and_name(bs, id, name, &sn, &local_err);
1005 if (error_is_set(&local_err)) {
1006 error_propagate(errp, local_err);
1007 return NULL;
1008 }
1009 if (!ret) {
1010 error_setg(errp,
1011 "Snapshot with id '%s' and name '%s' does not exist on "
1012 "device '%s'",
1013 STR_OR_NULL(id), STR_OR_NULL(name), device);
1014 return NULL;
1015 }
1016
1017 bdrv_snapshot_delete(bs, id, name, &local_err);
1018 if (error_is_set(&local_err)) {
1019 error_propagate(errp, local_err);
1020 return NULL;
1021 }
1022
1023 info = g_malloc0(sizeof(SnapshotInfo));
1024 info->id = g_strdup(sn.id_str);
1025 info->name = g_strdup(sn.name);
1026 info->date_nsec = sn.date_nsec;
1027 info->date_sec = sn.date_sec;
1028 info->vm_state_size = sn.vm_state_size;
1029 info->vm_clock_nsec = sn.vm_clock_nsec % 1000000000;
1030 info->vm_clock_sec = sn.vm_clock_nsec / 1000000000;
1031
1032 return info;
1033 }
1034
1035 /* New and old BlockDriverState structs for group snapshots */
1036
1037 typedef struct BlkTransactionState BlkTransactionState;
1038
1039 /* Only prepare() may fail. In a single transaction, only one of commit() or
1040 abort() will be called, clean() will always be called if it present. */
1041 typedef struct BdrvActionOps {
1042 /* Size of state struct, in bytes. */
1043 size_t instance_size;
1044 /* Prepare the work, must NOT be NULL. */
1045 void (*prepare)(BlkTransactionState *common, Error **errp);
1046 /* Commit the changes, can be NULL. */
1047 void (*commit)(BlkTransactionState *common);
1048 /* Abort the changes on fail, can be NULL. */
1049 void (*abort)(BlkTransactionState *common);
1050 /* Clean up resource in the end, can be NULL. */
1051 void (*clean)(BlkTransactionState *common);
1052 } BdrvActionOps;
1053
1054 /*
1055 * This structure must be arranged as first member in child type, assuming
1056 * that compiler will also arrange it to the same address with parent instance.
1057 * Later it will be used in free().
1058 */
1059 struct BlkTransactionState {
1060 TransactionAction *action;
1061 const BdrvActionOps *ops;
1062 QSIMPLEQ_ENTRY(BlkTransactionState) entry;
1063 };
1064
1065 /* internal snapshot private data */
1066 typedef struct InternalSnapshotState {
1067 BlkTransactionState common;
1068 BlockDriverState *bs;
1069 QEMUSnapshotInfo sn;
1070 } InternalSnapshotState;
1071
1072 static void internal_snapshot_prepare(BlkTransactionState *common,
1073 Error **errp)
1074 {
1075 const char *device;
1076 const char *name;
1077 BlockDriverState *bs;
1078 QEMUSnapshotInfo old_sn, *sn;
1079 bool ret;
1080 qemu_timeval tv;
1081 BlockdevSnapshotInternal *internal;
1082 InternalSnapshotState *state;
1083 int ret1;
1084
1085 g_assert(common->action->kind ==
1086 TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC);
1087 internal = common->action->blockdev_snapshot_internal_sync;
1088 state = DO_UPCAST(InternalSnapshotState, common, common);
1089
1090 /* 1. parse input */
1091 device = internal->device;
1092 name = internal->name;
1093
1094 /* 2. check for validation */
1095 bs = bdrv_find(device);
1096 if (!bs) {
1097 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1098 return;
1099 }
1100
1101 if (!bdrv_is_inserted(bs)) {
1102 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1103 return;
1104 }
1105
1106 if (bdrv_is_read_only(bs)) {
1107 error_set(errp, QERR_DEVICE_IS_READ_ONLY, device);
1108 return;
1109 }
1110
1111 if (!bdrv_can_snapshot(bs)) {
1112 error_set(errp, QERR_BLOCK_FORMAT_FEATURE_NOT_SUPPORTED,
1113 bs->drv->format_name, device, "internal snapshot");
1114 return;
1115 }
1116
1117 if (!strlen(name)) {
1118 error_setg(errp, "Name is empty");
1119 return;
1120 }
1121
1122 /* check whether a snapshot with name exist */
1123 ret = bdrv_snapshot_find_by_id_and_name(bs, NULL, name, &old_sn, errp);
1124 if (error_is_set(errp)) {
1125 return;
1126 } else if (ret) {
1127 error_setg(errp,
1128 "Snapshot with name '%s' already exists on device '%s'",
1129 name, device);
1130 return;
1131 }
1132
1133 /* 3. take the snapshot */
1134 sn = &state->sn;
1135 pstrcpy(sn->name, sizeof(sn->name), name);
1136 qemu_gettimeofday(&tv);
1137 sn->date_sec = tv.tv_sec;
1138 sn->date_nsec = tv.tv_usec * 1000;
1139 sn->vm_clock_nsec = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
1140
1141 ret1 = bdrv_snapshot_create(bs, sn);
1142 if (ret1 < 0) {
1143 error_setg_errno(errp, -ret1,
1144 "Failed to create snapshot '%s' on device '%s'",
1145 name, device);
1146 return;
1147 }
1148
1149 /* 4. succeed, mark a snapshot is created */
1150 state->bs = bs;
1151 }
1152
1153 static void internal_snapshot_abort(BlkTransactionState *common)
1154 {
1155 InternalSnapshotState *state =
1156 DO_UPCAST(InternalSnapshotState, common, common);
1157 BlockDriverState *bs = state->bs;
1158 QEMUSnapshotInfo *sn = &state->sn;
1159 Error *local_error = NULL;
1160
1161 if (!bs) {
1162 return;
1163 }
1164
1165 if (bdrv_snapshot_delete(bs, sn->id_str, sn->name, &local_error) < 0) {
1166 error_report("Failed to delete snapshot with id '%s' and name '%s' on "
1167 "device '%s' in abort: %s",
1168 sn->id_str,
1169 sn->name,
1170 bdrv_get_device_name(bs),
1171 error_get_pretty(local_error));
1172 error_free(local_error);
1173 }
1174 }
1175
1176 /* external snapshot private data */
1177 typedef struct ExternalSnapshotState {
1178 BlkTransactionState common;
1179 BlockDriverState *old_bs;
1180 BlockDriverState *new_bs;
1181 } ExternalSnapshotState;
1182
1183 static void external_snapshot_prepare(BlkTransactionState *common,
1184 Error **errp)
1185 {
1186 BlockDriver *drv;
1187 int flags, ret;
1188 Error *local_err = NULL;
1189 const char *device;
1190 const char *new_image_file;
1191 const char *format = "qcow2";
1192 enum NewImageMode mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
1193 ExternalSnapshotState *state =
1194 DO_UPCAST(ExternalSnapshotState, common, common);
1195 TransactionAction *action = common->action;
1196
1197 /* get parameters */
1198 g_assert(action->kind == TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC);
1199
1200 device = action->blockdev_snapshot_sync->device;
1201 new_image_file = action->blockdev_snapshot_sync->snapshot_file;
1202 if (action->blockdev_snapshot_sync->has_format) {
1203 format = action->blockdev_snapshot_sync->format;
1204 }
1205 if (action->blockdev_snapshot_sync->has_mode) {
1206 mode = action->blockdev_snapshot_sync->mode;
1207 }
1208
1209 /* start processing */
1210 drv = bdrv_find_format(format);
1211 if (!drv) {
1212 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
1213 return;
1214 }
1215
1216 state->old_bs = bdrv_find(device);
1217 if (!state->old_bs) {
1218 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1219 return;
1220 }
1221
1222 if (!bdrv_is_inserted(state->old_bs)) {
1223 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1224 return;
1225 }
1226
1227 if (bdrv_in_use(state->old_bs)) {
1228 error_set(errp, QERR_DEVICE_IN_USE, device);
1229 return;
1230 }
1231
1232 if (!bdrv_is_read_only(state->old_bs)) {
1233 if (bdrv_flush(state->old_bs)) {
1234 error_set(errp, QERR_IO_ERROR);
1235 return;
1236 }
1237 }
1238
1239 if (bdrv_check_ext_snapshot(state->old_bs) != EXT_SNAPSHOT_ALLOWED) {
1240 error_set(errp, QERR_FEATURE_DISABLED, "snapshot");
1241 return;
1242 }
1243
1244 flags = state->old_bs->open_flags;
1245
1246 /* create new image w/backing file */
1247 if (mode != NEW_IMAGE_MODE_EXISTING) {
1248 bdrv_img_create(new_image_file, format,
1249 state->old_bs->filename,
1250 state->old_bs->drv->format_name,
1251 NULL, -1, flags, &local_err, false);
1252 if (error_is_set(&local_err)) {
1253 error_propagate(errp, local_err);
1254 return;
1255 }
1256 }
1257
1258 /* We will manually add the backing_hd field to the bs later */
1259 state->new_bs = bdrv_new("");
1260 /* TODO Inherit bs->options or only take explicit options with an
1261 * extended QMP command? */
1262 ret = bdrv_open(state->new_bs, new_image_file, NULL,
1263 flags | BDRV_O_NO_BACKING, drv, &local_err);
1264 if (ret != 0) {
1265 error_propagate(errp, local_err);
1266 }
1267 }
1268
1269 static void external_snapshot_commit(BlkTransactionState *common)
1270 {
1271 ExternalSnapshotState *state =
1272 DO_UPCAST(ExternalSnapshotState, common, common);
1273
1274 /* This removes our old bs and adds the new bs */
1275 bdrv_append(state->new_bs, state->old_bs);
1276 /* We don't need (or want) to use the transactional
1277 * bdrv_reopen_multiple() across all the entries at once, because we
1278 * don't want to abort all of them if one of them fails the reopen */
1279 bdrv_reopen(state->new_bs, state->new_bs->open_flags & ~BDRV_O_RDWR,
1280 NULL);
1281 }
1282
1283 static void external_snapshot_abort(BlkTransactionState *common)
1284 {
1285 ExternalSnapshotState *state =
1286 DO_UPCAST(ExternalSnapshotState, common, common);
1287 if (state->new_bs) {
1288 bdrv_unref(state->new_bs);
1289 }
1290 }
1291
1292 typedef struct DriveBackupState {
1293 BlkTransactionState common;
1294 BlockDriverState *bs;
1295 BlockJob *job;
1296 } DriveBackupState;
1297
1298 static void drive_backup_prepare(BlkTransactionState *common, Error **errp)
1299 {
1300 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1301 DriveBackup *backup;
1302 Error *local_err = NULL;
1303
1304 assert(common->action->kind == TRANSACTION_ACTION_KIND_DRIVE_BACKUP);
1305 backup = common->action->drive_backup;
1306
1307 qmp_drive_backup(backup->device, backup->target,
1308 backup->has_format, backup->format,
1309 backup->sync,
1310 backup->has_mode, backup->mode,
1311 backup->has_speed, backup->speed,
1312 backup->has_on_source_error, backup->on_source_error,
1313 backup->has_on_target_error, backup->on_target_error,
1314 &local_err);
1315 if (error_is_set(&local_err)) {
1316 error_propagate(errp, local_err);
1317 state->bs = NULL;
1318 state->job = NULL;
1319 return;
1320 }
1321
1322 state->bs = bdrv_find(backup->device);
1323 state->job = state->bs->job;
1324 }
1325
1326 static void drive_backup_abort(BlkTransactionState *common)
1327 {
1328 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1329 BlockDriverState *bs = state->bs;
1330
1331 /* Only cancel if it's the job we started */
1332 if (bs && bs->job && bs->job == state->job) {
1333 block_job_cancel_sync(bs->job);
1334 }
1335 }
1336
1337 static void abort_prepare(BlkTransactionState *common, Error **errp)
1338 {
1339 error_setg(errp, "Transaction aborted using Abort action");
1340 }
1341
1342 static void abort_commit(BlkTransactionState *common)
1343 {
1344 g_assert_not_reached(); /* this action never succeeds */
1345 }
1346
1347 static const BdrvActionOps actions[] = {
1348 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC] = {
1349 .instance_size = sizeof(ExternalSnapshotState),
1350 .prepare = external_snapshot_prepare,
1351 .commit = external_snapshot_commit,
1352 .abort = external_snapshot_abort,
1353 },
1354 [TRANSACTION_ACTION_KIND_DRIVE_BACKUP] = {
1355 .instance_size = sizeof(DriveBackupState),
1356 .prepare = drive_backup_prepare,
1357 .abort = drive_backup_abort,
1358 },
1359 [TRANSACTION_ACTION_KIND_ABORT] = {
1360 .instance_size = sizeof(BlkTransactionState),
1361 .prepare = abort_prepare,
1362 .commit = abort_commit,
1363 },
1364 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC] = {
1365 .instance_size = sizeof(InternalSnapshotState),
1366 .prepare = internal_snapshot_prepare,
1367 .abort = internal_snapshot_abort,
1368 },
1369 };
1370
1371 /*
1372 * 'Atomic' group snapshots. The snapshots are taken as a set, and if any fail
1373 * then we do not pivot any of the devices in the group, and abandon the
1374 * snapshots
1375 */
1376 void qmp_transaction(TransactionActionList *dev_list, Error **errp)
1377 {
1378 TransactionActionList *dev_entry = dev_list;
1379 BlkTransactionState *state, *next;
1380 Error *local_err = NULL;
1381
1382 QSIMPLEQ_HEAD(snap_bdrv_states, BlkTransactionState) snap_bdrv_states;
1383 QSIMPLEQ_INIT(&snap_bdrv_states);
1384
1385 /* drain all i/o before any snapshots */
1386 bdrv_drain_all();
1387
1388 /* We don't do anything in this loop that commits us to the snapshot */
1389 while (NULL != dev_entry) {
1390 TransactionAction *dev_info = NULL;
1391 const BdrvActionOps *ops;
1392
1393 dev_info = dev_entry->value;
1394 dev_entry = dev_entry->next;
1395
1396 assert(dev_info->kind < ARRAY_SIZE(actions));
1397
1398 ops = &actions[dev_info->kind];
1399 assert(ops->instance_size > 0);
1400
1401 state = g_malloc0(ops->instance_size);
1402 state->ops = ops;
1403 state->action = dev_info;
1404 QSIMPLEQ_INSERT_TAIL(&snap_bdrv_states, state, entry);
1405
1406 state->ops->prepare(state, &local_err);
1407 if (error_is_set(&local_err)) {
1408 error_propagate(errp, local_err);
1409 goto delete_and_fail;
1410 }
1411 }
1412
1413 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) {
1414 if (state->ops->commit) {
1415 state->ops->commit(state);
1416 }
1417 }
1418
1419 /* success */
1420 goto exit;
1421
1422 delete_and_fail:
1423 /*
1424 * failure, and it is all-or-none; abandon each new bs, and keep using
1425 * the original bs for all images
1426 */
1427 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) {
1428 if (state->ops->abort) {
1429 state->ops->abort(state);
1430 }
1431 }
1432 exit:
1433 QSIMPLEQ_FOREACH_SAFE(state, &snap_bdrv_states, entry, next) {
1434 if (state->ops->clean) {
1435 state->ops->clean(state);
1436 }
1437 g_free(state);
1438 }
1439 }
1440
1441
1442 static void eject_device(BlockDriverState *bs, int force, Error **errp)
1443 {
1444 if (bdrv_in_use(bs)) {
1445 error_set(errp, QERR_DEVICE_IN_USE, bdrv_get_device_name(bs));
1446 return;
1447 }
1448 if (!bdrv_dev_has_removable_media(bs)) {
1449 error_set(errp, QERR_DEVICE_NOT_REMOVABLE, bdrv_get_device_name(bs));
1450 return;
1451 }
1452
1453 if (bdrv_dev_is_medium_locked(bs) && !bdrv_dev_is_tray_open(bs)) {
1454 bdrv_dev_eject_request(bs, force);
1455 if (!force) {
1456 error_set(errp, QERR_DEVICE_LOCKED, bdrv_get_device_name(bs));
1457 return;
1458 }
1459 }
1460
1461 bdrv_close(bs);
1462 }
1463
1464 void qmp_eject(const char *device, bool has_force, bool force, Error **errp)
1465 {
1466 BlockDriverState *bs;
1467
1468 bs = bdrv_find(device);
1469 if (!bs) {
1470 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1471 return;
1472 }
1473
1474 eject_device(bs, force, errp);
1475 }
1476
1477 void qmp_block_passwd(const char *device, const char *password, Error **errp)
1478 {
1479 BlockDriverState *bs;
1480 int err;
1481
1482 bs = bdrv_find(device);
1483 if (!bs) {
1484 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1485 return;
1486 }
1487
1488 err = bdrv_set_key(bs, password);
1489 if (err == -EINVAL) {
1490 error_set(errp, QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs));
1491 return;
1492 } else if (err < 0) {
1493 error_set(errp, QERR_INVALID_PASSWORD);
1494 return;
1495 }
1496 }
1497
1498 static void qmp_bdrv_open_encrypted(BlockDriverState *bs, const char *filename,
1499 int bdrv_flags, BlockDriver *drv,
1500 const char *password, Error **errp)
1501 {
1502 Error *local_err = NULL;
1503 int ret;
1504
1505 ret = bdrv_open(bs, filename, NULL, bdrv_flags, drv, &local_err);
1506 if (ret < 0) {
1507 error_propagate(errp, local_err);
1508 return;
1509 }
1510
1511 if (bdrv_key_required(bs)) {
1512 if (password) {
1513 if (bdrv_set_key(bs, password) < 0) {
1514 error_set(errp, QERR_INVALID_PASSWORD);
1515 }
1516 } else {
1517 error_set(errp, QERR_DEVICE_ENCRYPTED, bdrv_get_device_name(bs),
1518 bdrv_get_encrypted_filename(bs));
1519 }
1520 } else if (password) {
1521 error_set(errp, QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs));
1522 }
1523 }
1524
1525 void qmp_change_blockdev(const char *device, const char *filename,
1526 bool has_format, const char *format, Error **errp)
1527 {
1528 BlockDriverState *bs;
1529 BlockDriver *drv = NULL;
1530 int bdrv_flags;
1531 Error *err = NULL;
1532
1533 bs = bdrv_find(device);
1534 if (!bs) {
1535 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1536 return;
1537 }
1538
1539 if (format) {
1540 drv = bdrv_find_whitelisted_format(format, bs->read_only);
1541 if (!drv) {
1542 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
1543 return;
1544 }
1545 }
1546
1547 eject_device(bs, 0, &err);
1548 if (error_is_set(&err)) {
1549 error_propagate(errp, err);
1550 return;
1551 }
1552
1553 bdrv_flags = bdrv_is_read_only(bs) ? 0 : BDRV_O_RDWR;
1554 bdrv_flags |= bdrv_is_snapshot(bs) ? BDRV_O_SNAPSHOT : 0;
1555
1556 qmp_bdrv_open_encrypted(bs, filename, bdrv_flags, drv, NULL, errp);
1557 }
1558
1559 /* throttling disk I/O limits */
1560 void qmp_block_set_io_throttle(const char *device, int64_t bps, int64_t bps_rd,
1561 int64_t bps_wr,
1562 int64_t iops,
1563 int64_t iops_rd,
1564 int64_t iops_wr,
1565 bool has_bps_max,
1566 int64_t bps_max,
1567 bool has_bps_rd_max,
1568 int64_t bps_rd_max,
1569 bool has_bps_wr_max,
1570 int64_t bps_wr_max,
1571 bool has_iops_max,
1572 int64_t iops_max,
1573 bool has_iops_rd_max,
1574 int64_t iops_rd_max,
1575 bool has_iops_wr_max,
1576 int64_t iops_wr_max,
1577 bool has_iops_size,
1578 int64_t iops_size, Error **errp)
1579 {
1580 ThrottleConfig cfg;
1581 BlockDriverState *bs;
1582
1583 bs = bdrv_find(device);
1584 if (!bs) {
1585 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1586 return;
1587 }
1588
1589 memset(&cfg, 0, sizeof(cfg));
1590 cfg.buckets[THROTTLE_BPS_TOTAL].avg = bps;
1591 cfg.buckets[THROTTLE_BPS_READ].avg = bps_rd;
1592 cfg.buckets[THROTTLE_BPS_WRITE].avg = bps_wr;
1593
1594 cfg.buckets[THROTTLE_OPS_TOTAL].avg = iops;
1595 cfg.buckets[THROTTLE_OPS_READ].avg = iops_rd;
1596 cfg.buckets[THROTTLE_OPS_WRITE].avg = iops_wr;
1597
1598 if (has_bps_max) {
1599 cfg.buckets[THROTTLE_BPS_TOTAL].max = bps_max;
1600 }
1601 if (has_bps_rd_max) {
1602 cfg.buckets[THROTTLE_BPS_READ].max = bps_rd_max;
1603 }
1604 if (has_bps_wr_max) {
1605 cfg.buckets[THROTTLE_BPS_WRITE].max = bps_wr_max;
1606 }
1607 if (has_iops_max) {
1608 cfg.buckets[THROTTLE_OPS_TOTAL].max = iops_max;
1609 }
1610 if (has_iops_rd_max) {
1611 cfg.buckets[THROTTLE_OPS_READ].max = iops_rd_max;
1612 }
1613 if (has_iops_wr_max) {
1614 cfg.buckets[THROTTLE_OPS_WRITE].max = iops_wr_max;
1615 }
1616
1617 if (has_iops_size) {
1618 cfg.op_size = iops_size;
1619 }
1620
1621 if (!check_throttle_config(&cfg, errp)) {
1622 return;
1623 }
1624
1625 if (!bs->io_limits_enabled && throttle_enabled(&cfg)) {
1626 bdrv_io_limits_enable(bs);
1627 } else if (bs->io_limits_enabled && !throttle_enabled(&cfg)) {
1628 bdrv_io_limits_disable(bs);
1629 }
1630
1631 if (bs->io_limits_enabled) {
1632 bdrv_set_io_limits(bs, &cfg);
1633 }
1634 }
1635
1636 int do_drive_del(Monitor *mon, const QDict *qdict, QObject **ret_data)
1637 {
1638 const char *id = qdict_get_str(qdict, "id");
1639 BlockDriverState *bs;
1640
1641 bs = bdrv_find(id);
1642 if (!bs) {
1643 qerror_report(QERR_DEVICE_NOT_FOUND, id);
1644 return -1;
1645 }
1646 if (bdrv_in_use(bs)) {
1647 qerror_report(QERR_DEVICE_IN_USE, id);
1648 return -1;
1649 }
1650
1651 /* quiesce block driver; prevent further io */
1652 bdrv_drain_all();
1653 bdrv_flush(bs);
1654 bdrv_close(bs);
1655
1656 /* if we have a device attached to this BlockDriverState
1657 * then we need to make the drive anonymous until the device
1658 * can be removed. If this is a drive with no device backing
1659 * then we can just get rid of the block driver state right here.
1660 */
1661 if (bdrv_get_attached_dev(bs)) {
1662 bdrv_make_anon(bs);
1663
1664 /* Further I/O must not pause the guest */
1665 bdrv_set_on_error(bs, BLOCKDEV_ON_ERROR_REPORT,
1666 BLOCKDEV_ON_ERROR_REPORT);
1667 } else {
1668 drive_uninit(drive_get_by_blockdev(bs));
1669 }
1670
1671 return 0;
1672 }
1673
1674 void qmp_block_resize(const char *device, int64_t size, Error **errp)
1675 {
1676 BlockDriverState *bs;
1677 int ret;
1678
1679 bs = bdrv_find(device);
1680 if (!bs) {
1681 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1682 return;
1683 }
1684
1685 if (size < 0) {
1686 error_set(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size");
1687 return;
1688 }
1689
1690 /* complete all in-flight operations before resizing the device */
1691 bdrv_drain_all();
1692
1693 ret = bdrv_truncate(bs, size);
1694 switch (ret) {
1695 case 0:
1696 break;
1697 case -ENOMEDIUM:
1698 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1699 break;
1700 case -ENOTSUP:
1701 error_set(errp, QERR_UNSUPPORTED);
1702 break;
1703 case -EACCES:
1704 error_set(errp, QERR_DEVICE_IS_READ_ONLY, device);
1705 break;
1706 case -EBUSY:
1707 error_set(errp, QERR_DEVICE_IN_USE, device);
1708 break;
1709 default:
1710 error_setg_errno(errp, -ret, "Could not resize");
1711 break;
1712 }
1713 }
1714
1715 static void block_job_cb(void *opaque, int ret)
1716 {
1717 BlockDriverState *bs = opaque;
1718 QObject *obj;
1719
1720 trace_block_job_cb(bs, bs->job, ret);
1721
1722 assert(bs->job);
1723 obj = qobject_from_block_job(bs->job);
1724 if (ret < 0) {
1725 QDict *dict = qobject_to_qdict(obj);
1726 qdict_put(dict, "error", qstring_from_str(strerror(-ret)));
1727 }
1728
1729 if (block_job_is_cancelled(bs->job)) {
1730 monitor_protocol_event(QEVENT_BLOCK_JOB_CANCELLED, obj);
1731 } else {
1732 monitor_protocol_event(QEVENT_BLOCK_JOB_COMPLETED, obj);
1733 }
1734 qobject_decref(obj);
1735
1736 bdrv_put_ref_bh_schedule(bs);
1737 }
1738
1739 void qmp_block_stream(const char *device, bool has_base,
1740 const char *base, bool has_speed, int64_t speed,
1741 bool has_on_error, BlockdevOnError on_error,
1742 Error **errp)
1743 {
1744 BlockDriverState *bs;
1745 BlockDriverState *base_bs = NULL;
1746 Error *local_err = NULL;
1747
1748 if (!has_on_error) {
1749 on_error = BLOCKDEV_ON_ERROR_REPORT;
1750 }
1751
1752 bs = bdrv_find(device);
1753 if (!bs) {
1754 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1755 return;
1756 }
1757
1758 if (base) {
1759 base_bs = bdrv_find_backing_image(bs, base);
1760 if (base_bs == NULL) {
1761 error_set(errp, QERR_BASE_NOT_FOUND, base);
1762 return;
1763 }
1764 }
1765
1766 stream_start(bs, base_bs, base, has_speed ? speed : 0,
1767 on_error, block_job_cb, bs, &local_err);
1768 if (error_is_set(&local_err)) {
1769 error_propagate(errp, local_err);
1770 return;
1771 }
1772
1773 trace_qmp_block_stream(bs, bs->job);
1774 }
1775
1776 void qmp_block_commit(const char *device,
1777 bool has_base, const char *base, const char *top,
1778 bool has_speed, int64_t speed,
1779 Error **errp)
1780 {
1781 BlockDriverState *bs;
1782 BlockDriverState *base_bs, *top_bs;
1783 Error *local_err = NULL;
1784 /* This will be part of the QMP command, if/when the
1785 * BlockdevOnError change for blkmirror makes it in
1786 */
1787 BlockdevOnError on_error = BLOCKDEV_ON_ERROR_REPORT;
1788
1789 /* drain all i/o before commits */
1790 bdrv_drain_all();
1791
1792 bs = bdrv_find(device);
1793 if (!bs) {
1794 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1795 return;
1796 }
1797
1798 /* default top_bs is the active layer */
1799 top_bs = bs;
1800
1801 if (top) {
1802 if (strcmp(bs->filename, top) != 0) {
1803 top_bs = bdrv_find_backing_image(bs, top);
1804 }
1805 }
1806
1807 if (top_bs == NULL) {
1808 error_setg(errp, "Top image file %s not found", top ? top : "NULL");
1809 return;
1810 }
1811
1812 if (has_base && base) {
1813 base_bs = bdrv_find_backing_image(top_bs, base);
1814 } else {
1815 base_bs = bdrv_find_base(top_bs);
1816 }
1817
1818 if (base_bs == NULL) {
1819 error_set(errp, QERR_BASE_NOT_FOUND, base ? base : "NULL");
1820 return;
1821 }
1822
1823 commit_start(bs, base_bs, top_bs, speed, on_error, block_job_cb, bs,
1824 &local_err);
1825 if (local_err != NULL) {
1826 error_propagate(errp, local_err);
1827 return;
1828 }
1829 }
1830
1831 void qmp_drive_backup(const char *device, const char *target,
1832 bool has_format, const char *format,
1833 enum MirrorSyncMode sync,
1834 bool has_mode, enum NewImageMode mode,
1835 bool has_speed, int64_t speed,
1836 bool has_on_source_error, BlockdevOnError on_source_error,
1837 bool has_on_target_error, BlockdevOnError on_target_error,
1838 Error **errp)
1839 {
1840 BlockDriverState *bs;
1841 BlockDriverState *target_bs;
1842 BlockDriverState *source = NULL;
1843 BlockDriver *drv = NULL;
1844 Error *local_err = NULL;
1845 int flags;
1846 int64_t size;
1847 int ret;
1848
1849 if (!has_speed) {
1850 speed = 0;
1851 }
1852 if (!has_on_source_error) {
1853 on_source_error = BLOCKDEV_ON_ERROR_REPORT;
1854 }
1855 if (!has_on_target_error) {
1856 on_target_error = BLOCKDEV_ON_ERROR_REPORT;
1857 }
1858 if (!has_mode) {
1859 mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
1860 }
1861
1862 bs = bdrv_find(device);
1863 if (!bs) {
1864 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1865 return;
1866 }
1867
1868 if (!bdrv_is_inserted(bs)) {
1869 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1870 return;
1871 }
1872
1873 if (!has_format) {
1874 format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name;
1875 }
1876 if (format) {
1877 drv = bdrv_find_format(format);
1878 if (!drv) {
1879 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
1880 return;
1881 }
1882 }
1883
1884 if (bdrv_in_use(bs)) {
1885 error_set(errp, QERR_DEVICE_IN_USE, device);
1886 return;
1887 }
1888
1889 flags = bs->open_flags | BDRV_O_RDWR;
1890
1891 /* See if we have a backing HD we can use to create our new image
1892 * on top of. */
1893 if (sync == MIRROR_SYNC_MODE_TOP) {
1894 source = bs->backing_hd;
1895 if (!source) {
1896 sync = MIRROR_SYNC_MODE_FULL;
1897 }
1898 }
1899 if (sync == MIRROR_SYNC_MODE_NONE) {
1900 source = bs;
1901 }
1902
1903 size = bdrv_getlength(bs);
1904 if (size < 0) {
1905 error_setg_errno(errp, -size, "bdrv_getlength failed");
1906 return;
1907 }
1908
1909 if (mode != NEW_IMAGE_MODE_EXISTING) {
1910 assert(format && drv);
1911 if (source) {
1912 bdrv_img_create(target, format, source->filename,
1913 source->drv->format_name, NULL,
1914 size, flags, &local_err, false);
1915 } else {
1916 bdrv_img_create(target, format, NULL, NULL, NULL,
1917 size, flags, &local_err, false);
1918 }
1919 }
1920
1921 if (error_is_set(&local_err)) {
1922 error_propagate(errp, local_err);
1923 return;
1924 }
1925
1926 target_bs = bdrv_new("");
1927 ret = bdrv_open(target_bs, target, NULL, flags, drv, &local_err);
1928 if (ret < 0) {
1929 bdrv_unref(target_bs);
1930 error_propagate(errp, local_err);
1931 return;
1932 }
1933
1934 backup_start(bs, target_bs, speed, sync, on_source_error, on_target_error,
1935 block_job_cb, bs, &local_err);
1936 if (local_err != NULL) {
1937 bdrv_unref(target_bs);
1938 error_propagate(errp, local_err);
1939 return;
1940 }
1941 }
1942
1943 #define DEFAULT_MIRROR_BUF_SIZE (10 << 20)
1944
1945 void qmp_drive_mirror(const char *device, const char *target,
1946 bool has_format, const char *format,
1947 enum MirrorSyncMode sync,
1948 bool has_mode, enum NewImageMode mode,
1949 bool has_speed, int64_t speed,
1950 bool has_granularity, uint32_t granularity,
1951 bool has_buf_size, int64_t buf_size,
1952 bool has_on_source_error, BlockdevOnError on_source_error,
1953 bool has_on_target_error, BlockdevOnError on_target_error,
1954 Error **errp)
1955 {
1956 BlockDriverState *bs;
1957 BlockDriverState *source, *target_bs;
1958 BlockDriver *drv = NULL;
1959 Error *local_err = NULL;
1960 int flags;
1961 int64_t size;
1962 int ret;
1963
1964 if (!has_speed) {
1965 speed = 0;
1966 }
1967 if (!has_on_source_error) {
1968 on_source_error = BLOCKDEV_ON_ERROR_REPORT;
1969 }
1970 if (!has_on_target_error) {
1971 on_target_error = BLOCKDEV_ON_ERROR_REPORT;
1972 }
1973 if (!has_mode) {
1974 mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
1975 }
1976 if (!has_granularity) {
1977 granularity = 0;
1978 }
1979 if (!has_buf_size) {
1980 buf_size = DEFAULT_MIRROR_BUF_SIZE;
1981 }
1982
1983 if (granularity != 0 && (granularity < 512 || granularity > 1048576 * 64)) {
1984 error_set(errp, QERR_INVALID_PARAMETER, device);
1985 return;
1986 }
1987 if (granularity & (granularity - 1)) {
1988 error_set(errp, QERR_INVALID_PARAMETER, device);
1989 return;
1990 }
1991
1992 bs = bdrv_find(device);
1993 if (!bs) {
1994 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1995 return;
1996 }
1997
1998 if (!bdrv_is_inserted(bs)) {
1999 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
2000 return;
2001 }
2002
2003 if (!has_format) {
2004 format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name;
2005 }
2006 if (format) {
2007 drv = bdrv_find_format(format);
2008 if (!drv) {
2009 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
2010 return;
2011 }
2012 }
2013
2014 if (bdrv_in_use(bs)) {
2015 error_set(errp, QERR_DEVICE_IN_USE, device);
2016 return;
2017 }
2018
2019 flags = bs->open_flags | BDRV_O_RDWR;
2020 source = bs->backing_hd;
2021 if (!source && sync == MIRROR_SYNC_MODE_TOP) {
2022 sync = MIRROR_SYNC_MODE_FULL;
2023 }
2024 if (sync == MIRROR_SYNC_MODE_NONE) {
2025 source = bs;
2026 }
2027
2028 size = bdrv_getlength(bs);
2029 if (size < 0) {
2030 error_setg_errno(errp, -size, "bdrv_getlength failed");
2031 return;
2032 }
2033
2034 if ((sync == MIRROR_SYNC_MODE_FULL || !source)
2035 && mode != NEW_IMAGE_MODE_EXISTING)
2036 {
2037 /* create new image w/o backing file */
2038 assert(format && drv);
2039 bdrv_img_create(target, format,
2040 NULL, NULL, NULL, size, flags, &local_err, false);
2041 } else {
2042 switch (mode) {
2043 case NEW_IMAGE_MODE_EXISTING:
2044 break;
2045 case NEW_IMAGE_MODE_ABSOLUTE_PATHS:
2046 /* create new image with backing file */
2047 bdrv_img_create(target, format,
2048 source->filename,
2049 source->drv->format_name,
2050 NULL, size, flags, &local_err, false);
2051 break;
2052 default:
2053 abort();
2054 }
2055 }
2056
2057 if (error_is_set(&local_err)) {
2058 error_propagate(errp, local_err);
2059 return;
2060 }
2061
2062 /* Mirroring takes care of copy-on-write using the source's backing
2063 * file.
2064 */
2065 target_bs = bdrv_new("");
2066 ret = bdrv_open(target_bs, target, NULL, flags | BDRV_O_NO_BACKING, drv,
2067 &local_err);
2068 if (ret < 0) {
2069 bdrv_unref(target_bs);
2070 error_propagate(errp, local_err);
2071 return;
2072 }
2073
2074 mirror_start(bs, target_bs, speed, granularity, buf_size, sync,
2075 on_source_error, on_target_error,
2076 block_job_cb, bs, &local_err);
2077 if (local_err != NULL) {
2078 bdrv_unref(target_bs);
2079 error_propagate(errp, local_err);
2080 return;
2081 }
2082 }
2083
2084 static BlockJob *find_block_job(const char *device)
2085 {
2086 BlockDriverState *bs;
2087
2088 bs = bdrv_find(device);
2089 if (!bs || !bs->job) {
2090 return NULL;
2091 }
2092 return bs->job;
2093 }
2094
2095 void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp)
2096 {
2097 BlockJob *job = find_block_job(device);
2098
2099 if (!job) {
2100 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
2101 return;
2102 }
2103
2104 block_job_set_speed(job, speed, errp);
2105 }
2106
2107 void qmp_block_job_cancel(const char *device,
2108 bool has_force, bool force, Error **errp)
2109 {
2110 BlockJob *job = find_block_job(device);
2111
2112 if (!has_force) {
2113 force = false;
2114 }
2115
2116 if (!job) {
2117 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
2118 return;
2119 }
2120 if (job->paused && !force) {
2121 error_set(errp, QERR_BLOCK_JOB_PAUSED, device);
2122 return;
2123 }
2124
2125 trace_qmp_block_job_cancel(job);
2126 block_job_cancel(job);
2127 }
2128
2129 void qmp_block_job_pause(const char *device, Error **errp)
2130 {
2131 BlockJob *job = find_block_job(device);
2132
2133 if (!job) {
2134 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
2135 return;
2136 }
2137
2138 trace_qmp_block_job_pause(job);
2139 block_job_pause(job);
2140 }
2141
2142 void qmp_block_job_resume(const char *device, Error **errp)
2143 {
2144 BlockJob *job = find_block_job(device);
2145
2146 if (!job) {
2147 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
2148 return;
2149 }
2150
2151 trace_qmp_block_job_resume(job);
2152 block_job_resume(job);
2153 }
2154
2155 void qmp_block_job_complete(const char *device, Error **errp)
2156 {
2157 BlockJob *job = find_block_job(device);
2158
2159 if (!job) {
2160 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
2161 return;
2162 }
2163
2164 trace_qmp_block_job_complete(job);
2165 block_job_complete(job, errp);
2166 }
2167
2168 void qmp_blockdev_add(BlockdevOptions *options, Error **errp)
2169 {
2170 QmpOutputVisitor *ov = qmp_output_visitor_new();
2171 QObject *obj;
2172 QDict *qdict;
2173 Error *local_err = NULL;
2174
2175 /* Require an ID in the top level */
2176 if (!options->has_id) {
2177 error_setg(errp, "Block device needs an ID");
2178 goto fail;
2179 }
2180
2181 /* TODO Sort it out in raw-posix and drive_init: Reject aio=native with
2182 * cache.direct=false instead of silently switching to aio=threads, except
2183 * if called from drive_init.
2184 *
2185 * For now, simply forbidding the combination for all drivers will do. */
2186 if (options->has_aio && options->aio == BLOCKDEV_AIO_OPTIONS_NATIVE) {
2187 bool direct = options->cache->has_direct && options->cache->direct;
2188 if (!options->has_cache && !direct) {
2189 error_setg(errp, "aio=native requires cache.direct=true");
2190 goto fail;
2191 }
2192 }
2193
2194 visit_type_BlockdevOptions(qmp_output_get_visitor(ov),
2195 &options, NULL, &local_err);
2196 if (error_is_set(&local_err)) {
2197 error_propagate(errp, local_err);
2198 goto fail;
2199 }
2200
2201 obj = qmp_output_get_qobject(ov);
2202 qdict = qobject_to_qdict(obj);
2203
2204 qdict_flatten(qdict);
2205
2206 blockdev_init(qdict, IF_NONE, &local_err);
2207 if (error_is_set(&local_err)) {
2208 error_propagate(errp, local_err);
2209 goto fail;
2210 }
2211
2212 fail:
2213 qmp_output_visitor_cleanup(ov);
2214 }
2215
2216 static void do_qmp_query_block_jobs_one(void *opaque, BlockDriverState *bs)
2217 {
2218 BlockJobInfoList **prev = opaque;
2219 BlockJob *job = bs->job;
2220
2221 if (job) {
2222 BlockJobInfoList *elem = g_new0(BlockJobInfoList, 1);
2223 elem->value = block_job_query(bs->job);
2224 (*prev)->next = elem;
2225 *prev = elem;
2226 }
2227 }
2228
2229 BlockJobInfoList *qmp_query_block_jobs(Error **errp)
2230 {
2231 /* Dummy is a fake list element for holding the head pointer */
2232 BlockJobInfoList dummy = {};
2233 BlockJobInfoList *prev = &dummy;
2234 bdrv_iterate(do_qmp_query_block_jobs_one, &prev);
2235 return dummy.next;
2236 }
2237
2238 QemuOptsList qemu_common_drive_opts = {
2239 .name = "drive",
2240 .head = QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts.head),
2241 .desc = {
2242 {
2243 .name = "snapshot",
2244 .type = QEMU_OPT_BOOL,
2245 .help = "enable/disable snapshot mode",
2246 },{
2247 .name = "file",
2248 .type = QEMU_OPT_STRING,
2249 .help = "disk image",
2250 },{
2251 .name = "discard",
2252 .type = QEMU_OPT_STRING,
2253 .help = "discard operation (ignore/off, unmap/on)",
2254 },{
2255 .name = "cache.writeback",
2256 .type = QEMU_OPT_BOOL,
2257 .help = "enables writeback mode for any caches",
2258 },{
2259 .name = "cache.direct",
2260 .type = QEMU_OPT_BOOL,
2261 .help = "enables use of O_DIRECT (bypass the host page cache)",
2262 },{
2263 .name = "cache.no-flush",
2264 .type = QEMU_OPT_BOOL,
2265 .help = "ignore any flush requests for the device",
2266 },{
2267 .name = "aio",
2268 .type = QEMU_OPT_STRING,
2269 .help = "host AIO implementation (threads, native)",
2270 },{
2271 .name = "format",
2272 .type = QEMU_OPT_STRING,
2273 .help = "disk format (raw, qcow2, ...)",
2274 },{
2275 .name = "serial",
2276 .type = QEMU_OPT_STRING,
2277 .help = "disk serial number",
2278 },{
2279 .name = "rerror",
2280 .type = QEMU_OPT_STRING,
2281 .help = "read error action",
2282 },{
2283 .name = "werror",
2284 .type = QEMU_OPT_STRING,
2285 .help = "write error action",
2286 },{
2287 .name = "read-only",
2288 .type = QEMU_OPT_BOOL,
2289 .help = "open drive file as read-only",
2290 },{
2291 .name = "throttling.iops-total",
2292 .type = QEMU_OPT_NUMBER,
2293 .help = "limit total I/O operations per second",
2294 },{
2295 .name = "throttling.iops-read",
2296 .type = QEMU_OPT_NUMBER,
2297 .help = "limit read operations per second",
2298 },{
2299 .name = "throttling.iops-write",
2300 .type = QEMU_OPT_NUMBER,
2301 .help = "limit write operations per second",
2302 },{
2303 .name = "throttling.bps-total",
2304 .type = QEMU_OPT_NUMBER,
2305 .help = "limit total bytes per second",
2306 },{
2307 .name = "throttling.bps-read",
2308 .type = QEMU_OPT_NUMBER,
2309 .help = "limit read bytes per second",
2310 },{
2311 .name = "throttling.bps-write",
2312 .type = QEMU_OPT_NUMBER,
2313 .help = "limit write bytes per second",
2314 },{
2315 .name = "throttling.iops-total-max",
2316 .type = QEMU_OPT_NUMBER,
2317 .help = "I/O operations burst",
2318 },{
2319 .name = "throttling.iops-read-max",
2320 .type = QEMU_OPT_NUMBER,
2321 .help = "I/O operations read burst",
2322 },{
2323 .name = "throttling.iops-write-max",
2324 .type = QEMU_OPT_NUMBER,
2325 .help = "I/O operations write burst",
2326 },{
2327 .name = "throttling.bps-total-max",
2328 .type = QEMU_OPT_NUMBER,
2329 .help = "total bytes burst",
2330 },{
2331 .name = "throttling.bps-read-max",
2332 .type = QEMU_OPT_NUMBER,
2333 .help = "total bytes read burst",
2334 },{
2335 .name = "throttling.bps-write-max",
2336 .type = QEMU_OPT_NUMBER,
2337 .help = "total bytes write burst",
2338 },{
2339 .name = "throttling.iops-size",
2340 .type = QEMU_OPT_NUMBER,
2341 .help = "when limiting by iops max size of an I/O in bytes",
2342 },{
2343 .name = "copy-on-read",
2344 .type = QEMU_OPT_BOOL,
2345 .help = "copy read data from backing file into image file",
2346 },
2347 { /* end of list */ }
2348 },
2349 };
2350
2351 QemuOptsList qemu_drive_opts = {
2352 .name = "drive",
2353 .head = QTAILQ_HEAD_INITIALIZER(qemu_drive_opts.head),
2354 .desc = {
2355 /*
2356 * no elements => accept any params
2357 * validation will happen later
2358 */
2359 { /* end of list */ }
2360 },
2361 };
QEmu