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Merge remote-tracking branch 'remotes/bonzini/tags/for-upstream' into staging
[qemu.git] / blockdev.c
blobfbb3a7997887f5728dc3182e36cdc4b2508c20c2
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/block-backend.h"
34 #include "sysemu/blockdev.h"
35 #include "hw/block/block.h"
36 #include "block/blockjob.h"
37 #include "monitor/monitor.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 "qapi/util.h"
44 #include "sysemu/sysemu.h"
45 #include "block/block_int.h"
46 #include "qmp-commands.h"
47 #include "trace.h"
48 #include "sysemu/arch_init.h"
49
50 static const char *const if_name[IF_COUNT] = {
51 [IF_NONE] = "none",
52 [IF_IDE] = "ide",
53 [IF_SCSI] = "scsi",
54 [IF_FLOPPY] = "floppy",
55 [IF_PFLASH] = "pflash",
56 [IF_MTD] = "mtd",
57 [IF_SD] = "sd",
58 [IF_VIRTIO] = "virtio",
59 [IF_XEN] = "xen",
60 };
61
62 static int if_max_devs[IF_COUNT] = {
63 /*
64 * Do not change these numbers! They govern how drive option
65 * index maps to unit and bus. That mapping is ABI.
66 *
67 * All controllers used to imlement if=T drives need to support
68 * if_max_devs[T] units, for any T with if_max_devs[T] != 0.
69 * Otherwise, some index values map to "impossible" bus, unit
70 * values.
71 *
72 * For instance, if you change [IF_SCSI] to 255, -drive
73 * if=scsi,index=12 no longer means bus=1,unit=5, but
74 * bus=0,unit=12. With an lsi53c895a controller (7 units max),
75 * the drive can't be set up. Regression.
76 */
77 [IF_IDE] = 2,
78 [IF_SCSI] = 7,
79 };
80
81 /**
82 * Boards may call this to offer board-by-board overrides
83 * of the default, global values.
84 */
85 void override_max_devs(BlockInterfaceType type, int max_devs)
86 {
87 BlockBackend *blk;
88 DriveInfo *dinfo;
89
90 if (max_devs <= 0) {
91 return;
92 }
93
94 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
95 dinfo = blk_legacy_dinfo(blk);
96 if (dinfo->type == type) {
97 fprintf(stderr, "Cannot override units-per-bus property of"
98 " the %s interface, because a drive of that type has"
99 " already been added.\n", if_name[type]);
100 g_assert_not_reached();
101 }
102 }
103
104 if_max_devs[type] = max_devs;
105 }
106
107 /*
108 * We automatically delete the drive when a device using it gets
109 * unplugged. Questionable feature, but we can't just drop it.
110 * Device models call blockdev_mark_auto_del() to schedule the
111 * automatic deletion, and generic qdev code calls blockdev_auto_del()
112 * when deletion is actually safe.
113 */
114 void blockdev_mark_auto_del(BlockBackend *blk)
115 {
116 DriveInfo *dinfo = blk_legacy_dinfo(blk);
117 BlockDriverState *bs = blk_bs(blk);
118 AioContext *aio_context;
119
120 if (!dinfo) {
121 return;
122 }
123
124 aio_context = bdrv_get_aio_context(bs);
125 aio_context_acquire(aio_context);
126
127 if (bs->job) {
128 block_job_cancel(bs->job);
129 }
130
131 aio_context_release(aio_context);
132
133 dinfo->auto_del = 1;
134 }
135
136 void blockdev_auto_del(BlockBackend *blk)
137 {
138 DriveInfo *dinfo = blk_legacy_dinfo(blk);
139
140 if (dinfo && dinfo->auto_del) {
141 blk_unref(blk);
142 }
143 }
144
145 /**
146 * Returns the current mapping of how many units per bus
147 * a particular interface can support.
148 *
149 * A positive integer indicates n units per bus.
150 * 0 implies the mapping has not been established.
151 * -1 indicates an invalid BlockInterfaceType was given.
152 */
153 int drive_get_max_devs(BlockInterfaceType type)
154 {
155 if (type >= IF_IDE && type < IF_COUNT) {
156 return if_max_devs[type];
157 }
158
159 return -1;
160 }
161
162 static int drive_index_to_bus_id(BlockInterfaceType type, int index)
163 {
164 int max_devs = if_max_devs[type];
165 return max_devs ? index / max_devs : 0;
166 }
167
168 static int drive_index_to_unit_id(BlockInterfaceType type, int index)
169 {
170 int max_devs = if_max_devs[type];
171 return max_devs ? index % max_devs : index;
172 }
173
174 QemuOpts *drive_def(const char *optstr)
175 {
176 return qemu_opts_parse(qemu_find_opts("drive"), optstr, 0);
177 }
178
179 QemuOpts *drive_add(BlockInterfaceType type, int index, const char *file,
180 const char *optstr)
181 {
182 QemuOpts *opts;
183
184 opts = drive_def(optstr);
185 if (!opts) {
186 return NULL;
187 }
188 if (type != IF_DEFAULT) {
189 qemu_opt_set(opts, "if", if_name[type], &error_abort);
190 }
191 if (index >= 0) {
192 qemu_opt_set_number(opts, "index", index, &error_abort);
193 }
194 if (file)
195 qemu_opt_set(opts, "file", file, &error_abort);
196 return opts;
197 }
198
199 DriveInfo *drive_get(BlockInterfaceType type, int bus, int unit)
200 {
201 BlockBackend *blk;
202 DriveInfo *dinfo;
203
204 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
205 dinfo = blk_legacy_dinfo(blk);
206 if (dinfo && dinfo->type == type
207 && dinfo->bus == bus && dinfo->unit == unit) {
208 return dinfo;
209 }
210 }
211
212 return NULL;
213 }
214
215 bool drive_check_orphaned(void)
216 {
217 BlockBackend *blk;
218 DriveInfo *dinfo;
219 bool rs = false;
220
221 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
222 dinfo = blk_legacy_dinfo(blk);
223 /* If dinfo->bdrv->dev is NULL, it has no device attached. */
224 /* Unless this is a default drive, this may be an oversight. */
225 if (!blk_get_attached_dev(blk) && !dinfo->is_default &&
226 dinfo->type != IF_NONE) {
227 fprintf(stderr, "Warning: Orphaned drive without device: "
228 "id=%s,file=%s,if=%s,bus=%d,unit=%d\n",
229 blk_name(blk), blk_bs(blk)->filename, if_name[dinfo->type],
230 dinfo->bus, dinfo->unit);
231 rs = true;
232 }
233 }
234
235 return rs;
236 }
237
238 DriveInfo *drive_get_by_index(BlockInterfaceType type, int index)
239 {
240 return drive_get(type,
241 drive_index_to_bus_id(type, index),
242 drive_index_to_unit_id(type, index));
243 }
244
245 int drive_get_max_bus(BlockInterfaceType type)
246 {
247 int max_bus;
248 BlockBackend *blk;
249 DriveInfo *dinfo;
250
251 max_bus = -1;
252 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
253 dinfo = blk_legacy_dinfo(blk);
254 if (dinfo && dinfo->type == type && dinfo->bus > max_bus) {
255 max_bus = dinfo->bus;
256 }
257 }
258 return max_bus;
259 }
260
261 /* Get a block device. This should only be used for single-drive devices
262 (e.g. SD/Floppy/MTD). Multi-disk devices (scsi/ide) should use the
263 appropriate bus. */
264 DriveInfo *drive_get_next(BlockInterfaceType type)
265 {
266 static int next_block_unit[IF_COUNT];
267
268 return drive_get(type, 0, next_block_unit[type]++);
269 }
270
271 static void bdrv_format_print(void *opaque, const char *name)
272 {
273 error_printf(" %s", name);
274 }
275
276 typedef struct {
277 QEMUBH *bh;
278 BlockDriverState *bs;
279 } BDRVPutRefBH;
280
281 static void bdrv_put_ref_bh(void *opaque)
282 {
283 BDRVPutRefBH *s = opaque;
284
285 bdrv_unref(s->bs);
286 qemu_bh_delete(s->bh);
287 g_free(s);
288 }
289
290 /*
291 * Release a BDS reference in a BH
292 *
293 * It is not safe to use bdrv_unref() from a callback function when the callers
294 * still need the BlockDriverState. In such cases we schedule a BH to release
295 * the reference.
296 */
297 static void bdrv_put_ref_bh_schedule(BlockDriverState *bs)
298 {
299 BDRVPutRefBH *s;
300
301 s = g_new(BDRVPutRefBH, 1);
302 s->bh = qemu_bh_new(bdrv_put_ref_bh, s);
303 s->bs = bs;
304 qemu_bh_schedule(s->bh);
305 }
306
307 static int parse_block_error_action(const char *buf, bool is_read, Error **errp)
308 {
309 if (!strcmp(buf, "ignore")) {
310 return BLOCKDEV_ON_ERROR_IGNORE;
311 } else if (!is_read && !strcmp(buf, "enospc")) {
312 return BLOCKDEV_ON_ERROR_ENOSPC;
313 } else if (!strcmp(buf, "stop")) {
314 return BLOCKDEV_ON_ERROR_STOP;
315 } else if (!strcmp(buf, "report")) {
316 return BLOCKDEV_ON_ERROR_REPORT;
317 } else {
318 error_setg(errp, "'%s' invalid %s error action",
319 buf, is_read ? "read" : "write");
320 return -1;
321 }
322 }
323
324 static bool check_throttle_config(ThrottleConfig *cfg, Error **errp)
325 {
326 if (throttle_conflicting(cfg)) {
327 error_setg(errp, "bps/iops/max total values and read/write values"
328 " cannot be used at the same time");
329 return false;
330 }
331
332 if (!throttle_is_valid(cfg)) {
333 error_setg(errp, "bps/iops/maxs values must be 0 or greater");
334 return false;
335 }
336
337 return true;
338 }
339
340 typedef enum { MEDIA_DISK, MEDIA_CDROM } DriveMediaType;
341
342 /* Takes the ownership of bs_opts */
343 static BlockBackend *blockdev_init(const char *file, QDict *bs_opts,
344 Error **errp)
345 {
346 const char *buf;
347 int ro = 0;
348 int bdrv_flags = 0;
349 int on_read_error, on_write_error;
350 BlockBackend *blk;
351 BlockDriverState *bs;
352 ThrottleConfig cfg;
353 int snapshot = 0;
354 bool copy_on_read;
355 Error *error = NULL;
356 QemuOpts *opts;
357 const char *id;
358 bool has_driver_specific_opts;
359 BlockdevDetectZeroesOptions detect_zeroes;
360
361 /* Check common options by copying from bs_opts to opts, all other options
362 * stay in bs_opts for processing by bdrv_open(). */
363 id = qdict_get_try_str(bs_opts, "id");
364 opts = qemu_opts_create(&qemu_common_drive_opts, id, 1, &error);
365 if (error) {
366 error_propagate(errp, error);
367 goto err_no_opts;
368 }
369
370 qemu_opts_absorb_qdict(opts, bs_opts, &error);
371 if (error) {
372 error_propagate(errp, error);
373 goto early_err;
374 }
375
376 if (id) {
377 qdict_del(bs_opts, "id");
378 }
379
380 has_driver_specific_opts = !!qdict_size(bs_opts);
381
382 /* extract parameters */
383 snapshot = qemu_opt_get_bool(opts, "snapshot", 0);
384 ro = qemu_opt_get_bool(opts, "read-only", 0);
385 copy_on_read = qemu_opt_get_bool(opts, "copy-on-read", false);
386
387 if ((buf = qemu_opt_get(opts, "discard")) != NULL) {
388 if (bdrv_parse_discard_flags(buf, &bdrv_flags) != 0) {
389 error_setg(errp, "invalid discard option");
390 goto early_err;
391 }
392 }
393
394 if (qemu_opt_get_bool(opts, "cache.writeback", true)) {
395 bdrv_flags |= BDRV_O_CACHE_WB;
396 }
397 if (qemu_opt_get_bool(opts, "cache.direct", false)) {
398 bdrv_flags |= BDRV_O_NOCACHE;
399 }
400 if (qemu_opt_get_bool(opts, "cache.no-flush", false)) {
401 bdrv_flags |= BDRV_O_NO_FLUSH;
402 }
403
404 #ifdef CONFIG_LINUX_AIO
405 if ((buf = qemu_opt_get(opts, "aio")) != NULL) {
406 if (!strcmp(buf, "native")) {
407 bdrv_flags |= BDRV_O_NATIVE_AIO;
408 } else if (!strcmp(buf, "threads")) {
409 /* this is the default */
410 } else {
411 error_setg(errp, "invalid aio option");
412 goto early_err;
413 }
414 }
415 #endif
416
417 if ((buf = qemu_opt_get(opts, "format")) != NULL) {
418 if (is_help_option(buf)) {
419 error_printf("Supported formats:");
420 bdrv_iterate_format(bdrv_format_print, NULL);
421 error_printf("\n");
422 goto early_err;
423 }
424
425 if (qdict_haskey(bs_opts, "driver")) {
426 error_setg(errp, "Cannot specify both 'driver' and 'format'");
427 goto early_err;
428 }
429 qdict_put(bs_opts, "driver", qstring_from_str(buf));
430 }
431
432 /* disk I/O throttling */
433 memset(&cfg, 0, sizeof(cfg));
434 cfg.buckets[THROTTLE_BPS_TOTAL].avg =
435 qemu_opt_get_number(opts, "throttling.bps-total", 0);
436 cfg.buckets[THROTTLE_BPS_READ].avg =
437 qemu_opt_get_number(opts, "throttling.bps-read", 0);
438 cfg.buckets[THROTTLE_BPS_WRITE].avg =
439 qemu_opt_get_number(opts, "throttling.bps-write", 0);
440 cfg.buckets[THROTTLE_OPS_TOTAL].avg =
441 qemu_opt_get_number(opts, "throttling.iops-total", 0);
442 cfg.buckets[THROTTLE_OPS_READ].avg =
443 qemu_opt_get_number(opts, "throttling.iops-read", 0);
444 cfg.buckets[THROTTLE_OPS_WRITE].avg =
445 qemu_opt_get_number(opts, "throttling.iops-write", 0);
446
447 cfg.buckets[THROTTLE_BPS_TOTAL].max =
448 qemu_opt_get_number(opts, "throttling.bps-total-max", 0);
449 cfg.buckets[THROTTLE_BPS_READ].max =
450 qemu_opt_get_number(opts, "throttling.bps-read-max", 0);
451 cfg.buckets[THROTTLE_BPS_WRITE].max =
452 qemu_opt_get_number(opts, "throttling.bps-write-max", 0);
453 cfg.buckets[THROTTLE_OPS_TOTAL].max =
454 qemu_opt_get_number(opts, "throttling.iops-total-max", 0);
455 cfg.buckets[THROTTLE_OPS_READ].max =
456 qemu_opt_get_number(opts, "throttling.iops-read-max", 0);
457 cfg.buckets[THROTTLE_OPS_WRITE].max =
458 qemu_opt_get_number(opts, "throttling.iops-write-max", 0);
459
460 cfg.op_size = qemu_opt_get_number(opts, "throttling.iops-size", 0);
461
462 if (!check_throttle_config(&cfg, &error)) {
463 error_propagate(errp, error);
464 goto early_err;
465 }
466
467 on_write_error = BLOCKDEV_ON_ERROR_ENOSPC;
468 if ((buf = qemu_opt_get(opts, "werror")) != NULL) {
469 on_write_error = parse_block_error_action(buf, 0, &error);
470 if (error) {
471 error_propagate(errp, error);
472 goto early_err;
473 }
474 }
475
476 on_read_error = BLOCKDEV_ON_ERROR_REPORT;
477 if ((buf = qemu_opt_get(opts, "rerror")) != NULL) {
478 on_read_error = parse_block_error_action(buf, 1, &error);
479 if (error) {
480 error_propagate(errp, error);
481 goto early_err;
482 }
483 }
484
485 detect_zeroes =
486 qapi_enum_parse(BlockdevDetectZeroesOptions_lookup,
487 qemu_opt_get(opts, "detect-zeroes"),
488 BLOCKDEV_DETECT_ZEROES_OPTIONS_MAX,
489 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF,
490 &error);
491 if (error) {
492 error_propagate(errp, error);
493 goto early_err;
494 }
495
496 if (detect_zeroes == BLOCKDEV_DETECT_ZEROES_OPTIONS_UNMAP &&
497 !(bdrv_flags & BDRV_O_UNMAP)) {
498 error_setg(errp, "setting detect-zeroes to unmap is not allowed "
499 "without setting discard operation to unmap");
500 goto early_err;
501 }
502
503 /* init */
504 if ((!file || !*file) && !has_driver_specific_opts) {
505 blk = blk_new_with_bs(qemu_opts_id(opts), errp);
506 if (!blk) {
507 goto early_err;
508 }
509
510 bs = blk_bs(blk);
511 bs->open_flags = snapshot ? BDRV_O_SNAPSHOT : 0;
512 bs->read_only = ro;
513
514 QDECREF(bs_opts);
515 } else {
516 if (file && !*file) {
517 file = NULL;
518 }
519
520 if (snapshot) {
521 /* always use cache=unsafe with snapshot */
522 bdrv_flags &= ~BDRV_O_CACHE_MASK;
523 bdrv_flags |= (BDRV_O_SNAPSHOT|BDRV_O_CACHE_WB|BDRV_O_NO_FLUSH);
524 }
525
526 if (copy_on_read) {
527 bdrv_flags |= BDRV_O_COPY_ON_READ;
528 }
529
530 if (runstate_check(RUN_STATE_INMIGRATE)) {
531 bdrv_flags |= BDRV_O_INCOMING;
532 }
533
534 bdrv_flags |= ro ? 0 : BDRV_O_RDWR;
535
536 blk = blk_new_open(qemu_opts_id(opts), file, NULL, bs_opts, bdrv_flags,
537 errp);
538 if (!blk) {
539 goto err_no_bs_opts;
540 }
541 bs = blk_bs(blk);
542 }
543
544 bs->detect_zeroes = detect_zeroes;
545
546 bdrv_set_on_error(bs, on_read_error, on_write_error);
547
548 /* disk I/O throttling */
549 if (throttle_enabled(&cfg)) {
550 bdrv_io_limits_enable(bs);
551 bdrv_set_io_limits(bs, &cfg);
552 }
553
554 if (bdrv_key_required(bs)) {
555 autostart = 0;
556 }
557
558 err_no_bs_opts:
559 qemu_opts_del(opts);
560 return blk;
561
562 early_err:
563 qemu_opts_del(opts);
564 err_no_opts:
565 QDECREF(bs_opts);
566 return NULL;
567 }
568
569 static void qemu_opt_rename(QemuOpts *opts, const char *from, const char *to,
570 Error **errp)
571 {
572 const char *value;
573
574 value = qemu_opt_get(opts, from);
575 if (value) {
576 if (qemu_opt_find(opts, to)) {
577 error_setg(errp, "'%s' and its alias '%s' can't be used at the "
578 "same time", to, from);
579 return;
580 }
581 }
582
583 /* rename all items in opts */
584 while ((value = qemu_opt_get(opts, from))) {
585 qemu_opt_set(opts, to, value, &error_abort);
586 qemu_opt_unset(opts, from);
587 }
588 }
589
590 QemuOptsList qemu_legacy_drive_opts = {
591 .name = "drive",
592 .head = QTAILQ_HEAD_INITIALIZER(qemu_legacy_drive_opts.head),
593 .desc = {
594 {
595 .name = "bus",
596 .type = QEMU_OPT_NUMBER,
597 .help = "bus number",
598 },{
599 .name = "unit",
600 .type = QEMU_OPT_NUMBER,
601 .help = "unit number (i.e. lun for scsi)",
602 },{
603 .name = "index",
604 .type = QEMU_OPT_NUMBER,
605 .help = "index number",
606 },{
607 .name = "media",
608 .type = QEMU_OPT_STRING,
609 .help = "media type (disk, cdrom)",
610 },{
611 .name = "if",
612 .type = QEMU_OPT_STRING,
613 .help = "interface (ide, scsi, sd, mtd, floppy, pflash, virtio)",
614 },{
615 .name = "cyls",
616 .type = QEMU_OPT_NUMBER,
617 .help = "number of cylinders (ide disk geometry)",
618 },{
619 .name = "heads",
620 .type = QEMU_OPT_NUMBER,
621 .help = "number of heads (ide disk geometry)",
622 },{
623 .name = "secs",
624 .type = QEMU_OPT_NUMBER,
625 .help = "number of sectors (ide disk geometry)",
626 },{
627 .name = "trans",
628 .type = QEMU_OPT_STRING,
629 .help = "chs translation (auto, lba, none)",
630 },{
631 .name = "boot",
632 .type = QEMU_OPT_BOOL,
633 .help = "(deprecated, ignored)",
634 },{
635 .name = "addr",
636 .type = QEMU_OPT_STRING,
637 .help = "pci address (virtio only)",
638 },{
639 .name = "serial",
640 .type = QEMU_OPT_STRING,
641 .help = "disk serial number",
642 },{
643 .name = "file",
644 .type = QEMU_OPT_STRING,
645 .help = "file name",
646 },
647
648 /* Options that are passed on, but have special semantics with -drive */
649 {
650 .name = "read-only",
651 .type = QEMU_OPT_BOOL,
652 .help = "open drive file as read-only",
653 },{
654 .name = "rerror",
655 .type = QEMU_OPT_STRING,
656 .help = "read error action",
657 },{
658 .name = "werror",
659 .type = QEMU_OPT_STRING,
660 .help = "write error action",
661 },{
662 .name = "copy-on-read",
663 .type = QEMU_OPT_BOOL,
664 .help = "copy read data from backing file into image file",
665 },
666
667 { /* end of list */ }
668 },
669 };
670
671 DriveInfo *drive_new(QemuOpts *all_opts, BlockInterfaceType block_default_type)
672 {
673 const char *value;
674 BlockBackend *blk;
675 DriveInfo *dinfo = NULL;
676 QDict *bs_opts;
677 QemuOpts *legacy_opts;
678 DriveMediaType media = MEDIA_DISK;
679 BlockInterfaceType type;
680 int cyls, heads, secs, translation;
681 int max_devs, bus_id, unit_id, index;
682 const char *devaddr;
683 const char *werror, *rerror;
684 bool read_only = false;
685 bool copy_on_read;
686 const char *serial;
687 const char *filename;
688 Error *local_err = NULL;
689 int i;
690
691 /* Change legacy command line options into QMP ones */
692 static const struct {
693 const char *from;
694 const char *to;
695 } opt_renames[] = {
696 { "iops", "throttling.iops-total" },
697 { "iops_rd", "throttling.iops-read" },
698 { "iops_wr", "throttling.iops-write" },
699
700 { "bps", "throttling.bps-total" },
701 { "bps_rd", "throttling.bps-read" },
702 { "bps_wr", "throttling.bps-write" },
703
704 { "iops_max", "throttling.iops-total-max" },
705 { "iops_rd_max", "throttling.iops-read-max" },
706 { "iops_wr_max", "throttling.iops-write-max" },
707
708 { "bps_max", "throttling.bps-total-max" },
709 { "bps_rd_max", "throttling.bps-read-max" },
710 { "bps_wr_max", "throttling.bps-write-max" },
711
712 { "iops_size", "throttling.iops-size" },
713
714 { "readonly", "read-only" },
715 };
716
717 for (i = 0; i < ARRAY_SIZE(opt_renames); i++) {
718 qemu_opt_rename(all_opts, opt_renames[i].from, opt_renames[i].to,
719 &local_err);
720 if (local_err) {
721 error_report_err(local_err);
722 return NULL;
723 }
724 }
725
726 value = qemu_opt_get(all_opts, "cache");
727 if (value) {
728 int flags = 0;
729
730 if (bdrv_parse_cache_flags(value, &flags) != 0) {
731 error_report("invalid cache option");
732 return NULL;
733 }
734
735 /* Specific options take precedence */
736 if (!qemu_opt_get(all_opts, "cache.writeback")) {
737 qemu_opt_set_bool(all_opts, "cache.writeback",
738 !!(flags & BDRV_O_CACHE_WB), &error_abort);
739 }
740 if (!qemu_opt_get(all_opts, "cache.direct")) {
741 qemu_opt_set_bool(all_opts, "cache.direct",
742 !!(flags & BDRV_O_NOCACHE), &error_abort);
743 }
744 if (!qemu_opt_get(all_opts, "cache.no-flush")) {
745 qemu_opt_set_bool(all_opts, "cache.no-flush",
746 !!(flags & BDRV_O_NO_FLUSH), &error_abort);
747 }
748 qemu_opt_unset(all_opts, "cache");
749 }
750
751 /* Get a QDict for processing the options */
752 bs_opts = qdict_new();
753 qemu_opts_to_qdict(all_opts, bs_opts);
754
755 legacy_opts = qemu_opts_create(&qemu_legacy_drive_opts, NULL, 0,
756 &error_abort);
757 qemu_opts_absorb_qdict(legacy_opts, bs_opts, &local_err);
758 if (local_err) {
759 error_report_err(local_err);
760 goto fail;
761 }
762
763 /* Deprecated option boot=[on|off] */
764 if (qemu_opt_get(legacy_opts, "boot") != NULL) {
765 fprintf(stderr, "qemu-kvm: boot=on|off is deprecated and will be "
766 "ignored. Future versions will reject this parameter. Please "
767 "update your scripts.\n");
768 }
769
770 /* Media type */
771 value = qemu_opt_get(legacy_opts, "media");
772 if (value) {
773 if (!strcmp(value, "disk")) {
774 media = MEDIA_DISK;
775 } else if (!strcmp(value, "cdrom")) {
776 media = MEDIA_CDROM;
777 read_only = true;
778 } else {
779 error_report("'%s' invalid media", value);
780 goto fail;
781 }
782 }
783
784 /* copy-on-read is disabled with a warning for read-only devices */
785 read_only |= qemu_opt_get_bool(legacy_opts, "read-only", false);
786 copy_on_read = qemu_opt_get_bool(legacy_opts, "copy-on-read", false);
787
788 if (read_only && copy_on_read) {
789 error_report("warning: disabling copy-on-read on read-only drive");
790 copy_on_read = false;
791 }
792
793 qdict_put(bs_opts, "read-only",
794 qstring_from_str(read_only ? "on" : "off"));
795 qdict_put(bs_opts, "copy-on-read",
796 qstring_from_str(copy_on_read ? "on" :"off"));
797
798 /* Controller type */
799 value = qemu_opt_get(legacy_opts, "if");
800 if (value) {
801 for (type = 0;
802 type < IF_COUNT && strcmp(value, if_name[type]);
803 type++) {
804 }
805 if (type == IF_COUNT) {
806 error_report("unsupported bus type '%s'", value);
807 goto fail;
808 }
809 } else {
810 type = block_default_type;
811 }
812
813 /* Geometry */
814 cyls = qemu_opt_get_number(legacy_opts, "cyls", 0);
815 heads = qemu_opt_get_number(legacy_opts, "heads", 0);
816 secs = qemu_opt_get_number(legacy_opts, "secs", 0);
817
818 if (cyls || heads || secs) {
819 if (cyls < 1) {
820 error_report("invalid physical cyls number");
821 goto fail;
822 }
823 if (heads < 1) {
824 error_report("invalid physical heads number");
825 goto fail;
826 }
827 if (secs < 1) {
828 error_report("invalid physical secs number");
829 goto fail;
830 }
831 }
832
833 translation = BIOS_ATA_TRANSLATION_AUTO;
834 value = qemu_opt_get(legacy_opts, "trans");
835 if (value != NULL) {
836 if (!cyls) {
837 error_report("'%s' trans must be used with cyls, heads and secs",
838 value);
839 goto fail;
840 }
841 if (!strcmp(value, "none")) {
842 translation = BIOS_ATA_TRANSLATION_NONE;
843 } else if (!strcmp(value, "lba")) {
844 translation = BIOS_ATA_TRANSLATION_LBA;
845 } else if (!strcmp(value, "large")) {
846 translation = BIOS_ATA_TRANSLATION_LARGE;
847 } else if (!strcmp(value, "rechs")) {
848 translation = BIOS_ATA_TRANSLATION_RECHS;
849 } else if (!strcmp(value, "auto")) {
850 translation = BIOS_ATA_TRANSLATION_AUTO;
851 } else {
852 error_report("'%s' invalid translation type", value);
853 goto fail;
854 }
855 }
856
857 if (media == MEDIA_CDROM) {
858 if (cyls || secs || heads) {
859 error_report("CHS can't be set with media=cdrom");
860 goto fail;
861 }
862 }
863
864 /* Device address specified by bus/unit or index.
865 * If none was specified, try to find the first free one. */
866 bus_id = qemu_opt_get_number(legacy_opts, "bus", 0);
867 unit_id = qemu_opt_get_number(legacy_opts, "unit", -1);
868 index = qemu_opt_get_number(legacy_opts, "index", -1);
869
870 max_devs = if_max_devs[type];
871
872 if (index != -1) {
873 if (bus_id != 0 || unit_id != -1) {
874 error_report("index cannot be used with bus and unit");
875 goto fail;
876 }
877 bus_id = drive_index_to_bus_id(type, index);
878 unit_id = drive_index_to_unit_id(type, index);
879 }
880
881 if (unit_id == -1) {
882 unit_id = 0;
883 while (drive_get(type, bus_id, unit_id) != NULL) {
884 unit_id++;
885 if (max_devs && unit_id >= max_devs) {
886 unit_id -= max_devs;
887 bus_id++;
888 }
889 }
890 }
891
892 if (max_devs && unit_id >= max_devs) {
893 error_report("unit %d too big (max is %d)", unit_id, max_devs - 1);
894 goto fail;
895 }
896
897 if (drive_get(type, bus_id, unit_id) != NULL) {
898 error_report("drive with bus=%d, unit=%d (index=%d) exists",
899 bus_id, unit_id, index);
900 goto fail;
901 }
902
903 /* Serial number */
904 serial = qemu_opt_get(legacy_opts, "serial");
905
906 /* no id supplied -> create one */
907 if (qemu_opts_id(all_opts) == NULL) {
908 char *new_id;
909 const char *mediastr = "";
910 if (type == IF_IDE || type == IF_SCSI) {
911 mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd";
912 }
913 if (max_devs) {
914 new_id = g_strdup_printf("%s%i%s%i", if_name[type], bus_id,
915 mediastr, unit_id);
916 } else {
917 new_id = g_strdup_printf("%s%s%i", if_name[type],
918 mediastr, unit_id);
919 }
920 qdict_put(bs_opts, "id", qstring_from_str(new_id));
921 g_free(new_id);
922 }
923
924 /* Add virtio block device */
925 devaddr = qemu_opt_get(legacy_opts, "addr");
926 if (devaddr && type != IF_VIRTIO) {
927 error_report("addr is not supported by this bus type");
928 goto fail;
929 }
930
931 if (type == IF_VIRTIO) {
932 QemuOpts *devopts;
933 devopts = qemu_opts_create(qemu_find_opts("device"), NULL, 0,
934 &error_abort);
935 if (arch_type == QEMU_ARCH_S390X) {
936 qemu_opt_set(devopts, "driver", "virtio-blk-s390", &error_abort);
937 } else {
938 qemu_opt_set(devopts, "driver", "virtio-blk-pci", &error_abort);
939 }
940 qemu_opt_set(devopts, "drive", qdict_get_str(bs_opts, "id"),
941 &error_abort);
942 if (devaddr) {
943 qemu_opt_set(devopts, "addr", devaddr, &error_abort);
944 }
945 }
946
947 filename = qemu_opt_get(legacy_opts, "file");
948
949 /* Check werror/rerror compatibility with if=... */
950 werror = qemu_opt_get(legacy_opts, "werror");
951 if (werror != NULL) {
952 if (type != IF_IDE && type != IF_SCSI && type != IF_VIRTIO &&
953 type != IF_NONE) {
954 error_report("werror is not supported by this bus type");
955 goto fail;
956 }
957 qdict_put(bs_opts, "werror", qstring_from_str(werror));
958 }
959
960 rerror = qemu_opt_get(legacy_opts, "rerror");
961 if (rerror != NULL) {
962 if (type != IF_IDE && type != IF_VIRTIO && type != IF_SCSI &&
963 type != IF_NONE) {
964 error_report("rerror is not supported by this bus type");
965 goto fail;
966 }
967 qdict_put(bs_opts, "rerror", qstring_from_str(rerror));
968 }
969
970 /* Actual block device init: Functionality shared with blockdev-add */
971 blk = blockdev_init(filename, bs_opts, &local_err);
972 bs_opts = NULL;
973 if (!blk) {
974 if (local_err) {
975 error_report_err(local_err);
976 }
977 goto fail;
978 } else {
979 assert(!local_err);
980 }
981
982 /* Create legacy DriveInfo */
983 dinfo = g_malloc0(sizeof(*dinfo));
984 dinfo->opts = all_opts;
985
986 dinfo->cyls = cyls;
987 dinfo->heads = heads;
988 dinfo->secs = secs;
989 dinfo->trans = translation;
990
991 dinfo->type = type;
992 dinfo->bus = bus_id;
993 dinfo->unit = unit_id;
994 dinfo->devaddr = devaddr;
995 dinfo->serial = g_strdup(serial);
996
997 blk_set_legacy_dinfo(blk, dinfo);
998
999 switch(type) {
1000 case IF_IDE:
1001 case IF_SCSI:
1002 case IF_XEN:
1003 case IF_NONE:
1004 dinfo->media_cd = media == MEDIA_CDROM;
1005 break;
1006 default:
1007 break;
1008 }
1009
1010 fail:
1011 qemu_opts_del(legacy_opts);
1012 QDECREF(bs_opts);
1013 return dinfo;
1014 }
1015
1016 void hmp_commit(Monitor *mon, const QDict *qdict)
1017 {
1018 const char *device = qdict_get_str(qdict, "device");
1019 BlockBackend *blk;
1020 int ret;
1021
1022 if (!strcmp(device, "all")) {
1023 ret = bdrv_commit_all();
1024 } else {
1025 blk = blk_by_name(device);
1026 if (!blk) {
1027 monitor_printf(mon, "Device '%s' not found\n", device);
1028 return;
1029 }
1030 ret = bdrv_commit(blk_bs(blk));
1031 }
1032 if (ret < 0) {
1033 monitor_printf(mon, "'commit' error for '%s': %s\n", device,
1034 strerror(-ret));
1035 }
1036 }
1037
1038 static void blockdev_do_action(int kind, void *data, Error **errp)
1039 {
1040 TransactionAction action;
1041 TransactionActionList list;
1042
1043 action.kind = kind;
1044 action.data = data;
1045 list.value = &action;
1046 list.next = NULL;
1047 qmp_transaction(&list, errp);
1048 }
1049
1050 void qmp_blockdev_snapshot_sync(bool has_device, const char *device,
1051 bool has_node_name, const char *node_name,
1052 const char *snapshot_file,
1053 bool has_snapshot_node_name,
1054 const char *snapshot_node_name,
1055 bool has_format, const char *format,
1056 bool has_mode, NewImageMode mode, Error **errp)
1057 {
1058 BlockdevSnapshot snapshot = {
1059 .has_device = has_device,
1060 .device = (char *) device,
1061 .has_node_name = has_node_name,
1062 .node_name = (char *) node_name,
1063 .snapshot_file = (char *) snapshot_file,
1064 .has_snapshot_node_name = has_snapshot_node_name,
1065 .snapshot_node_name = (char *) snapshot_node_name,
1066 .has_format = has_format,
1067 .format = (char *) format,
1068 .has_mode = has_mode,
1069 .mode = mode,
1070 };
1071 blockdev_do_action(TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC,
1072 &snapshot, errp);
1073 }
1074
1075 void qmp_blockdev_snapshot_internal_sync(const char *device,
1076 const char *name,
1077 Error **errp)
1078 {
1079 BlockdevSnapshotInternal snapshot = {
1080 .device = (char *) device,
1081 .name = (char *) name
1082 };
1083
1084 blockdev_do_action(TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC,
1085 &snapshot, errp);
1086 }
1087
1088 SnapshotInfo *qmp_blockdev_snapshot_delete_internal_sync(const char *device,
1089 bool has_id,
1090 const char *id,
1091 bool has_name,
1092 const char *name,
1093 Error **errp)
1094 {
1095 BlockDriverState *bs;
1096 BlockBackend *blk;
1097 AioContext *aio_context;
1098 QEMUSnapshotInfo sn;
1099 Error *local_err = NULL;
1100 SnapshotInfo *info = NULL;
1101 int ret;
1102
1103 blk = blk_by_name(device);
1104 if (!blk) {
1105 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1106 return NULL;
1107 }
1108 bs = blk_bs(blk);
1109
1110 if (!has_id) {
1111 id = NULL;
1112 }
1113
1114 if (!has_name) {
1115 name = NULL;
1116 }
1117
1118 if (!id && !name) {
1119 error_setg(errp, "Name or id must be provided");
1120 return NULL;
1121 }
1122
1123 aio_context = bdrv_get_aio_context(bs);
1124 aio_context_acquire(aio_context);
1125
1126 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT_DELETE, errp)) {
1127 goto out_aio_context;
1128 }
1129
1130 ret = bdrv_snapshot_find_by_id_and_name(bs, id, name, &sn, &local_err);
1131 if (local_err) {
1132 error_propagate(errp, local_err);
1133 goto out_aio_context;
1134 }
1135 if (!ret) {
1136 error_setg(errp,
1137 "Snapshot with id '%s' and name '%s' does not exist on "
1138 "device '%s'",
1139 STR_OR_NULL(id), STR_OR_NULL(name), device);
1140 goto out_aio_context;
1141 }
1142
1143 bdrv_snapshot_delete(bs, id, name, &local_err);
1144 if (local_err) {
1145 error_propagate(errp, local_err);
1146 goto out_aio_context;
1147 }
1148
1149 aio_context_release(aio_context);
1150
1151 info = g_new0(SnapshotInfo, 1);
1152 info->id = g_strdup(sn.id_str);
1153 info->name = g_strdup(sn.name);
1154 info->date_nsec = sn.date_nsec;
1155 info->date_sec = sn.date_sec;
1156 info->vm_state_size = sn.vm_state_size;
1157 info->vm_clock_nsec = sn.vm_clock_nsec % 1000000000;
1158 info->vm_clock_sec = sn.vm_clock_nsec / 1000000000;
1159
1160 return info;
1161
1162 out_aio_context:
1163 aio_context_release(aio_context);
1164 return NULL;
1165 }
1166
1167 /* New and old BlockDriverState structs for atomic group operations */
1168
1169 typedef struct BlkTransactionState BlkTransactionState;
1170
1171 /* Only prepare() may fail. In a single transaction, only one of commit() or
1172 abort() will be called, clean() will always be called if it present. */
1173 typedef struct BdrvActionOps {
1174 /* Size of state struct, in bytes. */
1175 size_t instance_size;
1176 /* Prepare the work, must NOT be NULL. */
1177 void (*prepare)(BlkTransactionState *common, Error **errp);
1178 /* Commit the changes, can be NULL. */
1179 void (*commit)(BlkTransactionState *common);
1180 /* Abort the changes on fail, can be NULL. */
1181 void (*abort)(BlkTransactionState *common);
1182 /* Clean up resource in the end, can be NULL. */
1183 void (*clean)(BlkTransactionState *common);
1184 } BdrvActionOps;
1185
1186 /*
1187 * This structure must be arranged as first member in child type, assuming
1188 * that compiler will also arrange it to the same address with parent instance.
1189 * Later it will be used in free().
1190 */
1191 struct BlkTransactionState {
1192 TransactionAction *action;
1193 const BdrvActionOps *ops;
1194 QSIMPLEQ_ENTRY(BlkTransactionState) entry;
1195 };
1196
1197 /* internal snapshot private data */
1198 typedef struct InternalSnapshotState {
1199 BlkTransactionState common;
1200 BlockDriverState *bs;
1201 AioContext *aio_context;
1202 QEMUSnapshotInfo sn;
1203 } InternalSnapshotState;
1204
1205 static void internal_snapshot_prepare(BlkTransactionState *common,
1206 Error **errp)
1207 {
1208 Error *local_err = NULL;
1209 const char *device;
1210 const char *name;
1211 BlockBackend *blk;
1212 BlockDriverState *bs;
1213 QEMUSnapshotInfo old_sn, *sn;
1214 bool ret;
1215 qemu_timeval tv;
1216 BlockdevSnapshotInternal *internal;
1217 InternalSnapshotState *state;
1218 int ret1;
1219
1220 g_assert(common->action->kind ==
1221 TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC);
1222 internal = common->action->blockdev_snapshot_internal_sync;
1223 state = DO_UPCAST(InternalSnapshotState, common, common);
1224
1225 /* 1. parse input */
1226 device = internal->device;
1227 name = internal->name;
1228
1229 /* 2. check for validation */
1230 blk = blk_by_name(device);
1231 if (!blk) {
1232 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1233 return;
1234 }
1235 bs = blk_bs(blk);
1236
1237 /* AioContext is released in .clean() */
1238 state->aio_context = bdrv_get_aio_context(bs);
1239 aio_context_acquire(state->aio_context);
1240
1241 if (!bdrv_is_inserted(bs)) {
1242 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1243 return;
1244 }
1245
1246 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT, errp)) {
1247 return;
1248 }
1249
1250 if (bdrv_is_read_only(bs)) {
1251 error_set(errp, QERR_DEVICE_IS_READ_ONLY, device);
1252 return;
1253 }
1254
1255 if (!bdrv_can_snapshot(bs)) {
1256 error_set(errp, QERR_BLOCK_FORMAT_FEATURE_NOT_SUPPORTED,
1257 bs->drv->format_name, device, "internal snapshot");
1258 return;
1259 }
1260
1261 if (!strlen(name)) {
1262 error_setg(errp, "Name is empty");
1263 return;
1264 }
1265
1266 /* check whether a snapshot with name exist */
1267 ret = bdrv_snapshot_find_by_id_and_name(bs, NULL, name, &old_sn,
1268 &local_err);
1269 if (local_err) {
1270 error_propagate(errp, local_err);
1271 return;
1272 } else if (ret) {
1273 error_setg(errp,
1274 "Snapshot with name '%s' already exists on device '%s'",
1275 name, device);
1276 return;
1277 }
1278
1279 /* 3. take the snapshot */
1280 sn = &state->sn;
1281 pstrcpy(sn->name, sizeof(sn->name), name);
1282 qemu_gettimeofday(&tv);
1283 sn->date_sec = tv.tv_sec;
1284 sn->date_nsec = tv.tv_usec * 1000;
1285 sn->vm_clock_nsec = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
1286
1287 ret1 = bdrv_snapshot_create(bs, sn);
1288 if (ret1 < 0) {
1289 error_setg_errno(errp, -ret1,
1290 "Failed to create snapshot '%s' on device '%s'",
1291 name, device);
1292 return;
1293 }
1294
1295 /* 4. succeed, mark a snapshot is created */
1296 state->bs = bs;
1297 }
1298
1299 static void internal_snapshot_abort(BlkTransactionState *common)
1300 {
1301 InternalSnapshotState *state =
1302 DO_UPCAST(InternalSnapshotState, common, common);
1303 BlockDriverState *bs = state->bs;
1304 QEMUSnapshotInfo *sn = &state->sn;
1305 Error *local_error = NULL;
1306
1307 if (!bs) {
1308 return;
1309 }
1310
1311 if (bdrv_snapshot_delete(bs, sn->id_str, sn->name, &local_error) < 0) {
1312 error_report("Failed to delete snapshot with id '%s' and name '%s' on "
1313 "device '%s' in abort: %s",
1314 sn->id_str,
1315 sn->name,
1316 bdrv_get_device_name(bs),
1317 error_get_pretty(local_error));
1318 error_free(local_error);
1319 }
1320 }
1321
1322 static void internal_snapshot_clean(BlkTransactionState *common)
1323 {
1324 InternalSnapshotState *state = DO_UPCAST(InternalSnapshotState,
1325 common, common);
1326
1327 if (state->aio_context) {
1328 aio_context_release(state->aio_context);
1329 }
1330 }
1331
1332 /* external snapshot private data */
1333 typedef struct ExternalSnapshotState {
1334 BlkTransactionState common;
1335 BlockDriverState *old_bs;
1336 BlockDriverState *new_bs;
1337 AioContext *aio_context;
1338 } ExternalSnapshotState;
1339
1340 static void external_snapshot_prepare(BlkTransactionState *common,
1341 Error **errp)
1342 {
1343 BlockDriver *drv;
1344 int flags, ret;
1345 QDict *options = NULL;
1346 Error *local_err = NULL;
1347 bool has_device = false;
1348 const char *device;
1349 bool has_node_name = false;
1350 const char *node_name;
1351 bool has_snapshot_node_name = false;
1352 const char *snapshot_node_name;
1353 const char *new_image_file;
1354 const char *format = "qcow2";
1355 enum NewImageMode mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
1356 ExternalSnapshotState *state =
1357 DO_UPCAST(ExternalSnapshotState, common, common);
1358 TransactionAction *action = common->action;
1359
1360 /* get parameters */
1361 g_assert(action->kind == TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC);
1362
1363 has_device = action->blockdev_snapshot_sync->has_device;
1364 device = action->blockdev_snapshot_sync->device;
1365 has_node_name = action->blockdev_snapshot_sync->has_node_name;
1366 node_name = action->blockdev_snapshot_sync->node_name;
1367 has_snapshot_node_name =
1368 action->blockdev_snapshot_sync->has_snapshot_node_name;
1369 snapshot_node_name = action->blockdev_snapshot_sync->snapshot_node_name;
1370
1371 new_image_file = action->blockdev_snapshot_sync->snapshot_file;
1372 if (action->blockdev_snapshot_sync->has_format) {
1373 format = action->blockdev_snapshot_sync->format;
1374 }
1375 if (action->blockdev_snapshot_sync->has_mode) {
1376 mode = action->blockdev_snapshot_sync->mode;
1377 }
1378
1379 /* start processing */
1380 drv = bdrv_find_format(format);
1381 if (!drv) {
1382 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
1383 return;
1384 }
1385
1386 state->old_bs = bdrv_lookup_bs(has_device ? device : NULL,
1387 has_node_name ? node_name : NULL,
1388 &local_err);
1389 if (local_err) {
1390 error_propagate(errp, local_err);
1391 return;
1392 }
1393
1394 if (has_node_name && !has_snapshot_node_name) {
1395 error_setg(errp, "New snapshot node name missing");
1396 return;
1397 }
1398
1399 if (has_snapshot_node_name && bdrv_find_node(snapshot_node_name)) {
1400 error_setg(errp, "New snapshot node name already existing");
1401 return;
1402 }
1403
1404 /* Acquire AioContext now so any threads operating on old_bs stop */
1405 state->aio_context = bdrv_get_aio_context(state->old_bs);
1406 aio_context_acquire(state->aio_context);
1407
1408 if (!bdrv_is_inserted(state->old_bs)) {
1409 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1410 return;
1411 }
1412
1413 if (bdrv_op_is_blocked(state->old_bs,
1414 BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT, errp)) {
1415 return;
1416 }
1417
1418 if (!bdrv_is_read_only(state->old_bs)) {
1419 if (bdrv_flush(state->old_bs)) {
1420 error_set(errp, QERR_IO_ERROR);
1421 return;
1422 }
1423 }
1424
1425 if (!bdrv_is_first_non_filter(state->old_bs)) {
1426 error_set(errp, QERR_FEATURE_DISABLED, "snapshot");
1427 return;
1428 }
1429
1430 flags = state->old_bs->open_flags;
1431
1432 /* create new image w/backing file */
1433 if (mode != NEW_IMAGE_MODE_EXISTING) {
1434 bdrv_img_create(new_image_file, format,
1435 state->old_bs->filename,
1436 state->old_bs->drv->format_name,
1437 NULL, -1, flags, &local_err, false);
1438 if (local_err) {
1439 error_propagate(errp, local_err);
1440 return;
1441 }
1442 }
1443
1444 if (has_snapshot_node_name) {
1445 options = qdict_new();
1446 qdict_put(options, "node-name",
1447 qstring_from_str(snapshot_node_name));
1448 }
1449
1450 /* TODO Inherit bs->options or only take explicit options with an
1451 * extended QMP command? */
1452 assert(state->new_bs == NULL);
1453 ret = bdrv_open(&state->new_bs, new_image_file, NULL, options,
1454 flags | BDRV_O_NO_BACKING, drv, &local_err);
1455 /* We will manually add the backing_hd field to the bs later */
1456 if (ret != 0) {
1457 error_propagate(errp, local_err);
1458 }
1459 }
1460
1461 static void external_snapshot_commit(BlkTransactionState *common)
1462 {
1463 ExternalSnapshotState *state =
1464 DO_UPCAST(ExternalSnapshotState, common, common);
1465
1466 bdrv_set_aio_context(state->new_bs, state->aio_context);
1467
1468 /* This removes our old bs and adds the new bs */
1469 bdrv_append(state->new_bs, state->old_bs);
1470 /* We don't need (or want) to use the transactional
1471 * bdrv_reopen_multiple() across all the entries at once, because we
1472 * don't want to abort all of them if one of them fails the reopen */
1473 bdrv_reopen(state->new_bs, state->new_bs->open_flags & ~BDRV_O_RDWR,
1474 NULL);
1475
1476 aio_context_release(state->aio_context);
1477 }
1478
1479 static void external_snapshot_abort(BlkTransactionState *common)
1480 {
1481 ExternalSnapshotState *state =
1482 DO_UPCAST(ExternalSnapshotState, common, common);
1483 if (state->new_bs) {
1484 bdrv_unref(state->new_bs);
1485 }
1486 if (state->aio_context) {
1487 aio_context_release(state->aio_context);
1488 }
1489 }
1490
1491 typedef struct DriveBackupState {
1492 BlkTransactionState common;
1493 BlockDriverState *bs;
1494 AioContext *aio_context;
1495 BlockJob *job;
1496 } DriveBackupState;
1497
1498 static void drive_backup_prepare(BlkTransactionState *common, Error **errp)
1499 {
1500 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1501 BlockDriverState *bs;
1502 BlockBackend *blk;
1503 DriveBackup *backup;
1504 Error *local_err = NULL;
1505
1506 assert(common->action->kind == TRANSACTION_ACTION_KIND_DRIVE_BACKUP);
1507 backup = common->action->drive_backup;
1508
1509 blk = blk_by_name(backup->device);
1510 if (!blk) {
1511 error_set(errp, QERR_DEVICE_NOT_FOUND, backup->device);
1512 return;
1513 }
1514 bs = blk_bs(blk);
1515
1516 /* AioContext is released in .clean() */
1517 state->aio_context = bdrv_get_aio_context(bs);
1518 aio_context_acquire(state->aio_context);
1519
1520 qmp_drive_backup(backup->device, backup->target,
1521 backup->has_format, backup->format,
1522 backup->sync,
1523 backup->has_mode, backup->mode,
1524 backup->has_speed, backup->speed,
1525 backup->has_on_source_error, backup->on_source_error,
1526 backup->has_on_target_error, backup->on_target_error,
1527 &local_err);
1528 if (local_err) {
1529 error_propagate(errp, local_err);
1530 return;
1531 }
1532
1533 state->bs = bs;
1534 state->job = state->bs->job;
1535 }
1536
1537 static void drive_backup_abort(BlkTransactionState *common)
1538 {
1539 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1540 BlockDriverState *bs = state->bs;
1541
1542 /* Only cancel if it's the job we started */
1543 if (bs && bs->job && bs->job == state->job) {
1544 block_job_cancel_sync(bs->job);
1545 }
1546 }
1547
1548 static void drive_backup_clean(BlkTransactionState *common)
1549 {
1550 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1551
1552 if (state->aio_context) {
1553 aio_context_release(state->aio_context);
1554 }
1555 }
1556
1557 typedef struct BlockdevBackupState {
1558 BlkTransactionState common;
1559 BlockDriverState *bs;
1560 BlockJob *job;
1561 AioContext *aio_context;
1562 } BlockdevBackupState;
1563
1564 static void blockdev_backup_prepare(BlkTransactionState *common, Error **errp)
1565 {
1566 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
1567 BlockdevBackup *backup;
1568 BlockDriverState *bs, *target;
1569 BlockBackend *blk;
1570 Error *local_err = NULL;
1571
1572 assert(common->action->kind == TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP);
1573 backup = common->action->blockdev_backup;
1574
1575 blk = blk_by_name(backup->device);
1576 if (!blk) {
1577 error_setg(errp, "Device '%s' not found", backup->device);
1578 return;
1579 }
1580 bs = blk_bs(blk);
1581
1582 blk = blk_by_name(backup->target);
1583 if (!blk) {
1584 error_setg(errp, "Device '%s' not found", backup->target);
1585 return;
1586 }
1587 target = blk_bs(blk);
1588
1589 /* AioContext is released in .clean() */
1590 state->aio_context = bdrv_get_aio_context(bs);
1591 if (state->aio_context != bdrv_get_aio_context(target)) {
1592 state->aio_context = NULL;
1593 error_setg(errp, "Backup between two IO threads is not implemented");
1594 return;
1595 }
1596 aio_context_acquire(state->aio_context);
1597
1598 qmp_blockdev_backup(backup->device, backup->target,
1599 backup->sync,
1600 backup->has_speed, backup->speed,
1601 backup->has_on_source_error, backup->on_source_error,
1602 backup->has_on_target_error, backup->on_target_error,
1603 &local_err);
1604 if (local_err) {
1605 error_propagate(errp, local_err);
1606 return;
1607 }
1608
1609 state->bs = bs;
1610 state->job = state->bs->job;
1611 }
1612
1613 static void blockdev_backup_abort(BlkTransactionState *common)
1614 {
1615 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
1616 BlockDriverState *bs = state->bs;
1617
1618 /* Only cancel if it's the job we started */
1619 if (bs && bs->job && bs->job == state->job) {
1620 block_job_cancel_sync(bs->job);
1621 }
1622 }
1623
1624 static void blockdev_backup_clean(BlkTransactionState *common)
1625 {
1626 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
1627
1628 if (state->aio_context) {
1629 aio_context_release(state->aio_context);
1630 }
1631 }
1632
1633 static void abort_prepare(BlkTransactionState *common, Error **errp)
1634 {
1635 error_setg(errp, "Transaction aborted using Abort action");
1636 }
1637
1638 static void abort_commit(BlkTransactionState *common)
1639 {
1640 g_assert_not_reached(); /* this action never succeeds */
1641 }
1642
1643 static const BdrvActionOps actions[] = {
1644 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC] = {
1645 .instance_size = sizeof(ExternalSnapshotState),
1646 .prepare = external_snapshot_prepare,
1647 .commit = external_snapshot_commit,
1648 .abort = external_snapshot_abort,
1649 },
1650 [TRANSACTION_ACTION_KIND_DRIVE_BACKUP] = {
1651 .instance_size = sizeof(DriveBackupState),
1652 .prepare = drive_backup_prepare,
1653 .abort = drive_backup_abort,
1654 .clean = drive_backup_clean,
1655 },
1656 [TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP] = {
1657 .instance_size = sizeof(BlockdevBackupState),
1658 .prepare = blockdev_backup_prepare,
1659 .abort = blockdev_backup_abort,
1660 .clean = blockdev_backup_clean,
1661 },
1662 [TRANSACTION_ACTION_KIND_ABORT] = {
1663 .instance_size = sizeof(BlkTransactionState),
1664 .prepare = abort_prepare,
1665 .commit = abort_commit,
1666 },
1667 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC] = {
1668 .instance_size = sizeof(InternalSnapshotState),
1669 .prepare = internal_snapshot_prepare,
1670 .abort = internal_snapshot_abort,
1671 .clean = internal_snapshot_clean,
1672 },
1673 };
1674
1675 /*
1676 * 'Atomic' group operations. The operations are performed as a set, and if
1677 * any fail then we roll back all operations in the group.
1678 */
1679 void qmp_transaction(TransactionActionList *dev_list, Error **errp)
1680 {
1681 TransactionActionList *dev_entry = dev_list;
1682 BlkTransactionState *state, *next;
1683 Error *local_err = NULL;
1684
1685 QSIMPLEQ_HEAD(snap_bdrv_states, BlkTransactionState) snap_bdrv_states;
1686 QSIMPLEQ_INIT(&snap_bdrv_states);
1687
1688 /* drain all i/o before any operations */
1689 bdrv_drain_all();
1690
1691 /* We don't do anything in this loop that commits us to the operations */
1692 while (NULL != dev_entry) {
1693 TransactionAction *dev_info = NULL;
1694 const BdrvActionOps *ops;
1695
1696 dev_info = dev_entry->value;
1697 dev_entry = dev_entry->next;
1698
1699 assert(dev_info->kind < ARRAY_SIZE(actions));
1700
1701 ops = &actions[dev_info->kind];
1702 assert(ops->instance_size > 0);
1703
1704 state = g_malloc0(ops->instance_size);
1705 state->ops = ops;
1706 state->action = dev_info;
1707 QSIMPLEQ_INSERT_TAIL(&snap_bdrv_states, state, entry);
1708
1709 state->ops->prepare(state, &local_err);
1710 if (local_err) {
1711 error_propagate(errp, local_err);
1712 goto delete_and_fail;
1713 }
1714 }
1715
1716 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) {
1717 if (state->ops->commit) {
1718 state->ops->commit(state);
1719 }
1720 }
1721
1722 /* success */
1723 goto exit;
1724
1725 delete_and_fail:
1726 /* failure, and it is all-or-none; roll back all operations */
1727 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) {
1728 if (state->ops->abort) {
1729 state->ops->abort(state);
1730 }
1731 }
1732 exit:
1733 QSIMPLEQ_FOREACH_SAFE(state, &snap_bdrv_states, entry, next) {
1734 if (state->ops->clean) {
1735 state->ops->clean(state);
1736 }
1737 g_free(state);
1738 }
1739 }
1740
1741
1742 static void eject_device(BlockBackend *blk, int force, Error **errp)
1743 {
1744 BlockDriverState *bs = blk_bs(blk);
1745 AioContext *aio_context;
1746
1747 aio_context = bdrv_get_aio_context(bs);
1748 aio_context_acquire(aio_context);
1749
1750 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_EJECT, errp)) {
1751 goto out;
1752 }
1753 if (!blk_dev_has_removable_media(blk)) {
1754 error_setg(errp, "Device '%s' is not removable",
1755 bdrv_get_device_name(bs));
1756 goto out;
1757 }
1758
1759 if (blk_dev_is_medium_locked(blk) && !blk_dev_is_tray_open(blk)) {
1760 blk_dev_eject_request(blk, force);
1761 if (!force) {
1762 error_setg(errp, "Device '%s' is locked",
1763 bdrv_get_device_name(bs));
1764 goto out;
1765 }
1766 }
1767
1768 bdrv_close(bs);
1769
1770 out:
1771 aio_context_release(aio_context);
1772 }
1773
1774 void qmp_eject(const char *device, bool has_force, bool force, Error **errp)
1775 {
1776 BlockBackend *blk;
1777
1778 blk = blk_by_name(device);
1779 if (!blk) {
1780 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1781 return;
1782 }
1783
1784 eject_device(blk, force, errp);
1785 }
1786
1787 void qmp_block_passwd(bool has_device, const char *device,
1788 bool has_node_name, const char *node_name,
1789 const char *password, Error **errp)
1790 {
1791 Error *local_err = NULL;
1792 BlockDriverState *bs;
1793 AioContext *aio_context;
1794
1795 bs = bdrv_lookup_bs(has_device ? device : NULL,
1796 has_node_name ? node_name : NULL,
1797 &local_err);
1798 if (local_err) {
1799 error_propagate(errp, local_err);
1800 return;
1801 }
1802
1803 aio_context = bdrv_get_aio_context(bs);
1804 aio_context_acquire(aio_context);
1805
1806 bdrv_add_key(bs, password, errp);
1807
1808 aio_context_release(aio_context);
1809 }
1810
1811 /* Assumes AioContext is held */
1812 static void qmp_bdrv_open_encrypted(BlockDriverState *bs, const char *filename,
1813 int bdrv_flags, BlockDriver *drv,
1814 const char *password, Error **errp)
1815 {
1816 Error *local_err = NULL;
1817 int ret;
1818
1819 ret = bdrv_open(&bs, filename, NULL, NULL, bdrv_flags, drv, &local_err);
1820 if (ret < 0) {
1821 error_propagate(errp, local_err);
1822 return;
1823 }
1824
1825 bdrv_add_key(bs, password, errp);
1826 }
1827
1828 void qmp_change_blockdev(const char *device, const char *filename,
1829 const char *format, Error **errp)
1830 {
1831 BlockBackend *blk;
1832 BlockDriverState *bs;
1833 AioContext *aio_context;
1834 BlockDriver *drv = NULL;
1835 int bdrv_flags;
1836 Error *err = NULL;
1837
1838 blk = blk_by_name(device);
1839 if (!blk) {
1840 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1841 return;
1842 }
1843 bs = blk_bs(blk);
1844
1845 aio_context = bdrv_get_aio_context(bs);
1846 aio_context_acquire(aio_context);
1847
1848 if (format) {
1849 drv = bdrv_find_whitelisted_format(format, bs->read_only);
1850 if (!drv) {
1851 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
1852 goto out;
1853 }
1854 }
1855
1856 eject_device(blk, 0, &err);
1857 if (err) {
1858 error_propagate(errp, err);
1859 goto out;
1860 }
1861
1862 bdrv_flags = bdrv_is_read_only(bs) ? 0 : BDRV_O_RDWR;
1863 bdrv_flags |= bdrv_is_snapshot(bs) ? BDRV_O_SNAPSHOT : 0;
1864
1865 qmp_bdrv_open_encrypted(bs, filename, bdrv_flags, drv, NULL, errp);
1866
1867 out:
1868 aio_context_release(aio_context);
1869 }
1870
1871 /* throttling disk I/O limits */
1872 void qmp_block_set_io_throttle(const char *device, int64_t bps, int64_t bps_rd,
1873 int64_t bps_wr,
1874 int64_t iops,
1875 int64_t iops_rd,
1876 int64_t iops_wr,
1877 bool has_bps_max,
1878 int64_t bps_max,
1879 bool has_bps_rd_max,
1880 int64_t bps_rd_max,
1881 bool has_bps_wr_max,
1882 int64_t bps_wr_max,
1883 bool has_iops_max,
1884 int64_t iops_max,
1885 bool has_iops_rd_max,
1886 int64_t iops_rd_max,
1887 bool has_iops_wr_max,
1888 int64_t iops_wr_max,
1889 bool has_iops_size,
1890 int64_t iops_size, Error **errp)
1891 {
1892 ThrottleConfig cfg;
1893 BlockDriverState *bs;
1894 BlockBackend *blk;
1895 AioContext *aio_context;
1896
1897 blk = blk_by_name(device);
1898 if (!blk) {
1899 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1900 return;
1901 }
1902 bs = blk_bs(blk);
1903
1904 memset(&cfg, 0, sizeof(cfg));
1905 cfg.buckets[THROTTLE_BPS_TOTAL].avg = bps;
1906 cfg.buckets[THROTTLE_BPS_READ].avg = bps_rd;
1907 cfg.buckets[THROTTLE_BPS_WRITE].avg = bps_wr;
1908
1909 cfg.buckets[THROTTLE_OPS_TOTAL].avg = iops;
1910 cfg.buckets[THROTTLE_OPS_READ].avg = iops_rd;
1911 cfg.buckets[THROTTLE_OPS_WRITE].avg = iops_wr;
1912
1913 if (has_bps_max) {
1914 cfg.buckets[THROTTLE_BPS_TOTAL].max = bps_max;
1915 }
1916 if (has_bps_rd_max) {
1917 cfg.buckets[THROTTLE_BPS_READ].max = bps_rd_max;
1918 }
1919 if (has_bps_wr_max) {
1920 cfg.buckets[THROTTLE_BPS_WRITE].max = bps_wr_max;
1921 }
1922 if (has_iops_max) {
1923 cfg.buckets[THROTTLE_OPS_TOTAL].max = iops_max;
1924 }
1925 if (has_iops_rd_max) {
1926 cfg.buckets[THROTTLE_OPS_READ].max = iops_rd_max;
1927 }
1928 if (has_iops_wr_max) {
1929 cfg.buckets[THROTTLE_OPS_WRITE].max = iops_wr_max;
1930 }
1931
1932 if (has_iops_size) {
1933 cfg.op_size = iops_size;
1934 }
1935
1936 if (!check_throttle_config(&cfg, errp)) {
1937 return;
1938 }
1939
1940 aio_context = bdrv_get_aio_context(bs);
1941 aio_context_acquire(aio_context);
1942
1943 if (!bs->io_limits_enabled && throttle_enabled(&cfg)) {
1944 bdrv_io_limits_enable(bs);
1945 } else if (bs->io_limits_enabled && !throttle_enabled(&cfg)) {
1946 bdrv_io_limits_disable(bs);
1947 }
1948
1949 if (bs->io_limits_enabled) {
1950 bdrv_set_io_limits(bs, &cfg);
1951 }
1952
1953 aio_context_release(aio_context);
1954 }
1955
1956 int hmp_drive_del(Monitor *mon, const QDict *qdict, QObject **ret_data)
1957 {
1958 const char *id = qdict_get_str(qdict, "id");
1959 BlockBackend *blk;
1960 BlockDriverState *bs;
1961 AioContext *aio_context;
1962 Error *local_err = NULL;
1963
1964 blk = blk_by_name(id);
1965 if (!blk) {
1966 error_report("Device '%s' not found", id);
1967 return -1;
1968 }
1969 bs = blk_bs(blk);
1970
1971 if (!blk_legacy_dinfo(blk)) {
1972 error_report("Deleting device added with blockdev-add"
1973 " is not supported");
1974 return -1;
1975 }
1976
1977 aio_context = bdrv_get_aio_context(bs);
1978 aio_context_acquire(aio_context);
1979
1980 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_DRIVE_DEL, &local_err)) {
1981 error_report_err(local_err);
1982 aio_context_release(aio_context);
1983 return -1;
1984 }
1985
1986 /* quiesce block driver; prevent further io */
1987 bdrv_drain_all();
1988 bdrv_flush(bs);
1989 bdrv_close(bs);
1990
1991 /* if we have a device attached to this BlockDriverState
1992 * then we need to make the drive anonymous until the device
1993 * can be removed. If this is a drive with no device backing
1994 * then we can just get rid of the block driver state right here.
1995 */
1996 if (blk_get_attached_dev(blk)) {
1997 blk_hide_on_behalf_of_hmp_drive_del(blk);
1998 /* Further I/O must not pause the guest */
1999 bdrv_set_on_error(bs, BLOCKDEV_ON_ERROR_REPORT,
2000 BLOCKDEV_ON_ERROR_REPORT);
2001 } else {
2002 blk_unref(blk);
2003 }
2004
2005 aio_context_release(aio_context);
2006 return 0;
2007 }
2008
2009 void qmp_block_resize(bool has_device, const char *device,
2010 bool has_node_name, const char *node_name,
2011 int64_t size, Error **errp)
2012 {
2013 Error *local_err = NULL;
2014 BlockDriverState *bs;
2015 AioContext *aio_context;
2016 int ret;
2017
2018 bs = bdrv_lookup_bs(has_device ? device : NULL,
2019 has_node_name ? node_name : NULL,
2020 &local_err);
2021 if (local_err) {
2022 error_propagate(errp, local_err);
2023 return;
2024 }
2025
2026 aio_context = bdrv_get_aio_context(bs);
2027 aio_context_acquire(aio_context);
2028
2029 if (!bdrv_is_first_non_filter(bs)) {
2030 error_set(errp, QERR_FEATURE_DISABLED, "resize");
2031 goto out;
2032 }
2033
2034 if (size < 0) {
2035 error_set(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size");
2036 goto out;
2037 }
2038
2039 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_RESIZE, NULL)) {
2040 error_set(errp, QERR_DEVICE_IN_USE, device);
2041 goto out;
2042 }
2043
2044 /* complete all in-flight operations before resizing the device */
2045 bdrv_drain_all();
2046
2047 ret = bdrv_truncate(bs, size);
2048 switch (ret) {
2049 case 0:
2050 break;
2051 case -ENOMEDIUM:
2052 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
2053 break;
2054 case -ENOTSUP:
2055 error_set(errp, QERR_UNSUPPORTED);
2056 break;
2057 case -EACCES:
2058 error_set(errp, QERR_DEVICE_IS_READ_ONLY, device);
2059 break;
2060 case -EBUSY:
2061 error_set(errp, QERR_DEVICE_IN_USE, device);
2062 break;
2063 default:
2064 error_setg_errno(errp, -ret, "Could not resize");
2065 break;
2066 }
2067
2068 out:
2069 aio_context_release(aio_context);
2070 }
2071
2072 static void block_job_cb(void *opaque, int ret)
2073 {
2074 /* Note that this function may be executed from another AioContext besides
2075 * the QEMU main loop. If you need to access anything that assumes the
2076 * QEMU global mutex, use a BH or introduce a mutex.
2077 */
2078
2079 BlockDriverState *bs = opaque;
2080 const char *msg = NULL;
2081
2082 trace_block_job_cb(bs, bs->job, ret);
2083
2084 assert(bs->job);
2085
2086 if (ret < 0) {
2087 msg = strerror(-ret);
2088 }
2089
2090 if (block_job_is_cancelled(bs->job)) {
2091 block_job_event_cancelled(bs->job);
2092 } else {
2093 block_job_event_completed(bs->job, msg);
2094 }
2095
2096 bdrv_put_ref_bh_schedule(bs);
2097 }
2098
2099 void qmp_block_stream(const char *device,
2100 bool has_base, const char *base,
2101 bool has_backing_file, const char *backing_file,
2102 bool has_speed, int64_t speed,
2103 bool has_on_error, BlockdevOnError on_error,
2104 Error **errp)
2105 {
2106 BlockBackend *blk;
2107 BlockDriverState *bs;
2108 BlockDriverState *base_bs = NULL;
2109 AioContext *aio_context;
2110 Error *local_err = NULL;
2111 const char *base_name = NULL;
2112
2113 if (!has_on_error) {
2114 on_error = BLOCKDEV_ON_ERROR_REPORT;
2115 }
2116
2117 blk = blk_by_name(device);
2118 if (!blk) {
2119 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
2120 return;
2121 }
2122 bs = blk_bs(blk);
2123
2124 aio_context = bdrv_get_aio_context(bs);
2125 aio_context_acquire(aio_context);
2126
2127 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_STREAM, errp)) {
2128 goto out;
2129 }
2130
2131 if (has_base) {
2132 base_bs = bdrv_find_backing_image(bs, base);
2133 if (base_bs == NULL) {
2134 error_set(errp, QERR_BASE_NOT_FOUND, base);
2135 goto out;
2136 }
2137 assert(bdrv_get_aio_context(base_bs) == aio_context);
2138 base_name = base;
2139 }
2140
2141 /* if we are streaming the entire chain, the result will have no backing
2142 * file, and specifying one is therefore an error */
2143 if (base_bs == NULL && has_backing_file) {
2144 error_setg(errp, "backing file specified, but streaming the "
2145 "entire chain");
2146 goto out;
2147 }
2148
2149 /* backing_file string overrides base bs filename */
2150 base_name = has_backing_file ? backing_file : base_name;
2151
2152 stream_start(bs, base_bs, base_name, has_speed ? speed : 0,
2153 on_error, block_job_cb, bs, &local_err);
2154 if (local_err) {
2155 error_propagate(errp, local_err);
2156 goto out;
2157 }
2158
2159 trace_qmp_block_stream(bs, bs->job);
2160
2161 out:
2162 aio_context_release(aio_context);
2163 }
2164
2165 void qmp_block_commit(const char *device,
2166 bool has_base, const char *base,
2167 bool has_top, const char *top,
2168 bool has_backing_file, const char *backing_file,
2169 bool has_speed, int64_t speed,
2170 Error **errp)
2171 {
2172 BlockBackend *blk;
2173 BlockDriverState *bs;
2174 BlockDriverState *base_bs, *top_bs;
2175 AioContext *aio_context;
2176 Error *local_err = NULL;
2177 /* This will be part of the QMP command, if/when the
2178 * BlockdevOnError change for blkmirror makes it in
2179 */
2180 BlockdevOnError on_error = BLOCKDEV_ON_ERROR_REPORT;
2181
2182 if (!has_speed) {
2183 speed = 0;
2184 }
2185
2186 /* Important Note:
2187 * libvirt relies on the DeviceNotFound error class in order to probe for
2188 * live commit feature versions; for this to work, we must make sure to
2189 * perform the device lookup before any generic errors that may occur in a
2190 * scenario in which all optional arguments are omitted. */
2191 blk = blk_by_name(device);
2192 if (!blk) {
2193 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
2194 return;
2195 }
2196 bs = blk_bs(blk);
2197
2198 aio_context = bdrv_get_aio_context(bs);
2199 aio_context_acquire(aio_context);
2200
2201 /* drain all i/o before commits */
2202 bdrv_drain_all();
2203
2204 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_COMMIT_SOURCE, errp)) {
2205 goto out;
2206 }
2207
2208 /* default top_bs is the active layer */
2209 top_bs = bs;
2210
2211 if (has_top && top) {
2212 if (strcmp(bs->filename, top) != 0) {
2213 top_bs = bdrv_find_backing_image(bs, top);
2214 }
2215 }
2216
2217 if (top_bs == NULL) {
2218 error_setg(errp, "Top image file %s not found", top ? top : "NULL");
2219 goto out;
2220 }
2221
2222 assert(bdrv_get_aio_context(top_bs) == aio_context);
2223
2224 if (has_base && base) {
2225 base_bs = bdrv_find_backing_image(top_bs, base);
2226 } else {
2227 base_bs = bdrv_find_base(top_bs);
2228 }
2229
2230 if (base_bs == NULL) {
2231 error_set(errp, QERR_BASE_NOT_FOUND, base ? base : "NULL");
2232 goto out;
2233 }
2234
2235 assert(bdrv_get_aio_context(base_bs) == aio_context);
2236
2237 if (bdrv_op_is_blocked(base_bs, BLOCK_OP_TYPE_COMMIT_TARGET, errp)) {
2238 goto out;
2239 }
2240
2241 /* Do not allow attempts to commit an image into itself */
2242 if (top_bs == base_bs) {
2243 error_setg(errp, "cannot commit an image into itself");
2244 goto out;
2245 }
2246
2247 if (top_bs == bs) {
2248 if (has_backing_file) {
2249 error_setg(errp, "'backing-file' specified,"
2250 " but 'top' is the active layer");
2251 goto out;
2252 }
2253 commit_active_start(bs, base_bs, speed, on_error, block_job_cb,
2254 bs, &local_err);
2255 } else {
2256 commit_start(bs, base_bs, top_bs, speed, on_error, block_job_cb, bs,
2257 has_backing_file ? backing_file : NULL, &local_err);
2258 }
2259 if (local_err != NULL) {
2260 error_propagate(errp, local_err);
2261 goto out;
2262 }
2263
2264 out:
2265 aio_context_release(aio_context);
2266 }
2267
2268 void qmp_drive_backup(const char *device, const char *target,
2269 bool has_format, const char *format,
2270 enum MirrorSyncMode sync,
2271 bool has_mode, enum NewImageMode mode,
2272 bool has_speed, int64_t speed,
2273 bool has_on_source_error, BlockdevOnError on_source_error,
2274 bool has_on_target_error, BlockdevOnError on_target_error,
2275 Error **errp)
2276 {
2277 BlockBackend *blk;
2278 BlockDriverState *bs;
2279 BlockDriverState *target_bs;
2280 BlockDriverState *source = NULL;
2281 AioContext *aio_context;
2282 BlockDriver *drv = NULL;
2283 Error *local_err = NULL;
2284 int flags;
2285 int64_t size;
2286 int ret;
2287
2288 if (!has_speed) {
2289 speed = 0;
2290 }
2291 if (!has_on_source_error) {
2292 on_source_error = BLOCKDEV_ON_ERROR_REPORT;
2293 }
2294 if (!has_on_target_error) {
2295 on_target_error = BLOCKDEV_ON_ERROR_REPORT;
2296 }
2297 if (!has_mode) {
2298 mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
2299 }
2300
2301 blk = blk_by_name(device);
2302 if (!blk) {
2303 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
2304 return;
2305 }
2306 bs = blk_bs(blk);
2307
2308 aio_context = bdrv_get_aio_context(bs);
2309 aio_context_acquire(aio_context);
2310
2311 /* Although backup_run has this check too, we need to use bs->drv below, so
2312 * do an early check redundantly. */
2313 if (!bdrv_is_inserted(bs)) {
2314 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
2315 goto out;
2316 }
2317
2318 if (!has_format) {
2319 format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name;
2320 }
2321 if (format) {
2322 drv = bdrv_find_format(format);
2323 if (!drv) {
2324 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
2325 goto out;
2326 }
2327 }
2328
2329 /* Early check to avoid creating target */
2330 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_BACKUP_SOURCE, errp)) {
2331 goto out;
2332 }
2333
2334 flags = bs->open_flags | BDRV_O_RDWR;
2335
2336 /* See if we have a backing HD we can use to create our new image
2337 * on top of. */
2338 if (sync == MIRROR_SYNC_MODE_TOP) {
2339 source = bs->backing_hd;
2340 if (!source) {
2341 sync = MIRROR_SYNC_MODE_FULL;
2342 }
2343 }
2344 if (sync == MIRROR_SYNC_MODE_NONE) {
2345 source = bs;
2346 }
2347
2348 size = bdrv_getlength(bs);
2349 if (size < 0) {
2350 error_setg_errno(errp, -size, "bdrv_getlength failed");
2351 goto out;
2352 }
2353
2354 if (mode != NEW_IMAGE_MODE_EXISTING) {
2355 assert(format && drv);
2356 if (source) {
2357 bdrv_img_create(target, format, source->filename,
2358 source->drv->format_name, NULL,
2359 size, flags, &local_err, false);
2360 } else {
2361 bdrv_img_create(target, format, NULL, NULL, NULL,
2362 size, flags, &local_err, false);
2363 }
2364 }
2365
2366 if (local_err) {
2367 error_propagate(errp, local_err);
2368 goto out;
2369 }
2370
2371 target_bs = NULL;
2372 ret = bdrv_open(&target_bs, target, NULL, NULL, flags, drv, &local_err);
2373 if (ret < 0) {
2374 error_propagate(errp, local_err);
2375 goto out;
2376 }
2377
2378 bdrv_set_aio_context(target_bs, aio_context);
2379
2380 backup_start(bs, target_bs, speed, sync, on_source_error, on_target_error,
2381 block_job_cb, bs, &local_err);
2382 if (local_err != NULL) {
2383 bdrv_unref(target_bs);
2384 error_propagate(errp, local_err);
2385 goto out;
2386 }
2387
2388 out:
2389 aio_context_release(aio_context);
2390 }
2391
2392 BlockDeviceInfoList *qmp_query_named_block_nodes(Error **errp)
2393 {
2394 return bdrv_named_nodes_list();
2395 }
2396
2397 void qmp_blockdev_backup(const char *device, const char *target,
2398 enum MirrorSyncMode sync,
2399 bool has_speed, int64_t speed,
2400 bool has_on_source_error,
2401 BlockdevOnError on_source_error,
2402 bool has_on_target_error,
2403 BlockdevOnError on_target_error,
2404 Error **errp)
2405 {
2406 BlockBackend *blk;
2407 BlockDriverState *bs;
2408 BlockDriverState *target_bs;
2409 Error *local_err = NULL;
2410 AioContext *aio_context;
2411
2412 if (!has_speed) {
2413 speed = 0;
2414 }
2415 if (!has_on_source_error) {
2416 on_source_error = BLOCKDEV_ON_ERROR_REPORT;
2417 }
2418 if (!has_on_target_error) {
2419 on_target_error = BLOCKDEV_ON_ERROR_REPORT;
2420 }
2421
2422 blk = blk_by_name(device);
2423 if (!blk) {
2424 error_setg(errp, "Device '%s' not found", device);
2425 return;
2426 }
2427 bs = blk_bs(blk);
2428
2429 aio_context = bdrv_get_aio_context(bs);
2430 aio_context_acquire(aio_context);
2431
2432 blk = blk_by_name(target);
2433 if (!blk) {
2434 error_setg(errp, "Device '%s' not found", target);
2435 goto out;
2436 }
2437 target_bs = blk_bs(blk);
2438
2439 bdrv_ref(target_bs);
2440 bdrv_set_aio_context(target_bs, aio_context);
2441 backup_start(bs, target_bs, speed, sync, on_source_error, on_target_error,
2442 block_job_cb, bs, &local_err);
2443 if (local_err != NULL) {
2444 bdrv_unref(target_bs);
2445 error_propagate(errp, local_err);
2446 }
2447 out:
2448 aio_context_release(aio_context);
2449 }
2450
2451 #define DEFAULT_MIRROR_BUF_SIZE (10 << 20)
2452
2453 void qmp_drive_mirror(const char *device, const char *target,
2454 bool has_format, const char *format,
2455 bool has_node_name, const char *node_name,
2456 bool has_replaces, const char *replaces,
2457 enum MirrorSyncMode sync,
2458 bool has_mode, enum NewImageMode mode,
2459 bool has_speed, int64_t speed,
2460 bool has_granularity, uint32_t granularity,
2461 bool has_buf_size, int64_t buf_size,
2462 bool has_on_source_error, BlockdevOnError on_source_error,
2463 bool has_on_target_error, BlockdevOnError on_target_error,
2464 Error **errp)
2465 {
2466 BlockBackend *blk;
2467 BlockDriverState *bs;
2468 BlockDriverState *source, *target_bs;
2469 AioContext *aio_context;
2470 BlockDriver *drv = NULL;
2471 Error *local_err = NULL;
2472 QDict *options = NULL;
2473 int flags;
2474 int64_t size;
2475 int ret;
2476
2477 if (!has_speed) {
2478 speed = 0;
2479 }
2480 if (!has_on_source_error) {
2481 on_source_error = BLOCKDEV_ON_ERROR_REPORT;
2482 }
2483 if (!has_on_target_error) {
2484 on_target_error = BLOCKDEV_ON_ERROR_REPORT;
2485 }
2486 if (!has_mode) {
2487 mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
2488 }
2489 if (!has_granularity) {
2490 granularity = 0;
2491 }
2492 if (!has_buf_size) {
2493 buf_size = DEFAULT_MIRROR_BUF_SIZE;
2494 }
2495
2496 if (granularity != 0 && (granularity < 512 || granularity > 1048576 * 64)) {
2497 error_set(errp, QERR_INVALID_PARAMETER_VALUE, "granularity",
2498 "a value in range [512B, 64MB]");
2499 return;
2500 }
2501 if (granularity & (granularity - 1)) {
2502 error_set(errp, QERR_INVALID_PARAMETER_VALUE, "granularity", "power of 2");
2503 return;
2504 }
2505
2506 blk = blk_by_name(device);
2507 if (!blk) {
2508 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
2509 return;
2510 }
2511 bs = blk_bs(blk);
2512
2513 aio_context = bdrv_get_aio_context(bs);
2514 aio_context_acquire(aio_context);
2515
2516 if (!bdrv_is_inserted(bs)) {
2517 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
2518 goto out;
2519 }
2520
2521 if (!has_format) {
2522 format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name;
2523 }
2524 if (format) {
2525 drv = bdrv_find_format(format);
2526 if (!drv) {
2527 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
2528 goto out;
2529 }
2530 }
2531
2532 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_MIRROR, errp)) {
2533 goto out;
2534 }
2535
2536 flags = bs->open_flags | BDRV_O_RDWR;
2537 source = bs->backing_hd;
2538 if (!source && sync == MIRROR_SYNC_MODE_TOP) {
2539 sync = MIRROR_SYNC_MODE_FULL;
2540 }
2541 if (sync == MIRROR_SYNC_MODE_NONE) {
2542 source = bs;
2543 }
2544
2545 size = bdrv_getlength(bs);
2546 if (size < 0) {
2547 error_setg_errno(errp, -size, "bdrv_getlength failed");
2548 goto out;
2549 }
2550
2551 if (has_replaces) {
2552 BlockDriverState *to_replace_bs;
2553 AioContext *replace_aio_context;
2554 int64_t replace_size;
2555
2556 if (!has_node_name) {
2557 error_setg(errp, "a node-name must be provided when replacing a"
2558 " named node of the graph");
2559 goto out;
2560 }
2561
2562 to_replace_bs = check_to_replace_node(replaces, &local_err);
2563
2564 if (!to_replace_bs) {
2565 error_propagate(errp, local_err);
2566 goto out;
2567 }
2568
2569 replace_aio_context = bdrv_get_aio_context(to_replace_bs);
2570 aio_context_acquire(replace_aio_context);
2571 replace_size = bdrv_getlength(to_replace_bs);
2572 aio_context_release(replace_aio_context);
2573
2574 if (size != replace_size) {
2575 error_setg(errp, "cannot replace image with a mirror image of "
2576 "different size");
2577 goto out;
2578 }
2579 }
2580
2581 if ((sync == MIRROR_SYNC_MODE_FULL || !source)
2582 && mode != NEW_IMAGE_MODE_EXISTING)
2583 {
2584 /* create new image w/o backing file */
2585 assert(format && drv);
2586 bdrv_img_create(target, format,
2587 NULL, NULL, NULL, size, flags, &local_err, false);
2588 } else {
2589 switch (mode) {
2590 case NEW_IMAGE_MODE_EXISTING:
2591 break;
2592 case NEW_IMAGE_MODE_ABSOLUTE_PATHS:
2593 /* create new image with backing file */
2594 bdrv_img_create(target, format,
2595 source->filename,
2596 source->drv->format_name,
2597 NULL, size, flags, &local_err, false);
2598 break;
2599 default:
2600 abort();
2601 }
2602 }
2603
2604 if (local_err) {
2605 error_propagate(errp, local_err);
2606 goto out;
2607 }
2608
2609 if (has_node_name) {
2610 options = qdict_new();
2611 qdict_put(options, "node-name", qstring_from_str(node_name));
2612 }
2613
2614 /* Mirroring takes care of copy-on-write using the source's backing
2615 * file.
2616 */
2617 target_bs = NULL;
2618 ret = bdrv_open(&target_bs, target, NULL, options,
2619 flags | BDRV_O_NO_BACKING, drv, &local_err);
2620 if (ret < 0) {
2621 error_propagate(errp, local_err);
2622 goto out;
2623 }
2624
2625 bdrv_set_aio_context(target_bs, aio_context);
2626
2627 /* pass the node name to replace to mirror start since it's loose coupling
2628 * and will allow to check whether the node still exist at mirror completion
2629 */
2630 mirror_start(bs, target_bs,
2631 has_replaces ? replaces : NULL,
2632 speed, granularity, buf_size, sync,
2633 on_source_error, on_target_error,
2634 block_job_cb, bs, &local_err);
2635 if (local_err != NULL) {
2636 bdrv_unref(target_bs);
2637 error_propagate(errp, local_err);
2638 goto out;
2639 }
2640
2641 out:
2642 aio_context_release(aio_context);
2643 }
2644
2645 /* Get the block job for a given device name and acquire its AioContext */
2646 static BlockJob *find_block_job(const char *device, AioContext **aio_context,
2647 Error **errp)
2648 {
2649 BlockBackend *blk;
2650 BlockDriverState *bs;
2651
2652 blk = blk_by_name(device);
2653 if (!blk) {
2654 goto notfound;
2655 }
2656 bs = blk_bs(blk);
2657
2658 *aio_context = bdrv_get_aio_context(bs);
2659 aio_context_acquire(*aio_context);
2660
2661 if (!bs->job) {
2662 aio_context_release(*aio_context);
2663 goto notfound;
2664 }
2665
2666 return bs->job;
2667
2668 notfound:
2669 error_set(errp, ERROR_CLASS_DEVICE_NOT_ACTIVE,
2670 "No active block job on device '%s'", device);
2671 *aio_context = NULL;
2672 return NULL;
2673 }
2674
2675 void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp)
2676 {
2677 AioContext *aio_context;
2678 BlockJob *job = find_block_job(device, &aio_context, errp);
2679
2680 if (!job) {
2681 return;
2682 }
2683
2684 block_job_set_speed(job, speed, errp);
2685 aio_context_release(aio_context);
2686 }
2687
2688 void qmp_block_job_cancel(const char *device,
2689 bool has_force, bool force, Error **errp)
2690 {
2691 AioContext *aio_context;
2692 BlockJob *job = find_block_job(device, &aio_context, errp);
2693
2694 if (!job) {
2695 return;
2696 }
2697
2698 if (!has_force) {
2699 force = false;
2700 }
2701
2702 if (job->paused && !force) {
2703 error_setg(errp, "The block job for device '%s' is currently paused",
2704 device);
2705 goto out;
2706 }
2707
2708 trace_qmp_block_job_cancel(job);
2709 block_job_cancel(job);
2710 out:
2711 aio_context_release(aio_context);
2712 }
2713
2714 void qmp_block_job_pause(const char *device, Error **errp)
2715 {
2716 AioContext *aio_context;
2717 BlockJob *job = find_block_job(device, &aio_context, errp);
2718
2719 if (!job) {
2720 return;
2721 }
2722
2723 trace_qmp_block_job_pause(job);
2724 block_job_pause(job);
2725 aio_context_release(aio_context);
2726 }
2727
2728 void qmp_block_job_resume(const char *device, Error **errp)
2729 {
2730 AioContext *aio_context;
2731 BlockJob *job = find_block_job(device, &aio_context, errp);
2732
2733 if (!job) {
2734 return;
2735 }
2736
2737 trace_qmp_block_job_resume(job);
2738 block_job_resume(job);
2739 aio_context_release(aio_context);
2740 }
2741
2742 void qmp_block_job_complete(const char *device, Error **errp)
2743 {
2744 AioContext *aio_context;
2745 BlockJob *job = find_block_job(device, &aio_context, errp);
2746
2747 if (!job) {
2748 return;
2749 }
2750
2751 trace_qmp_block_job_complete(job);
2752 block_job_complete(job, errp);
2753 aio_context_release(aio_context);
2754 }
2755
2756 void qmp_change_backing_file(const char *device,
2757 const char *image_node_name,
2758 const char *backing_file,
2759 Error **errp)
2760 {
2761 BlockBackend *blk;
2762 BlockDriverState *bs = NULL;
2763 AioContext *aio_context;
2764 BlockDriverState *image_bs = NULL;
2765 Error *local_err = NULL;
2766 bool ro;
2767 int open_flags;
2768 int ret;
2769
2770 blk = blk_by_name(device);
2771 if (!blk) {
2772 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
2773 return;
2774 }
2775 bs = blk_bs(blk);
2776
2777 aio_context = bdrv_get_aio_context(bs);
2778 aio_context_acquire(aio_context);
2779
2780 image_bs = bdrv_lookup_bs(NULL, image_node_name, &local_err);
2781 if (local_err) {
2782 error_propagate(errp, local_err);
2783 goto out;
2784 }
2785
2786 if (!image_bs) {
2787 error_setg(errp, "image file not found");
2788 goto out;
2789 }
2790
2791 if (bdrv_find_base(image_bs) == image_bs) {
2792 error_setg(errp, "not allowing backing file change on an image "
2793 "without a backing file");
2794 goto out;
2795 }
2796
2797 /* even though we are not necessarily operating on bs, we need it to
2798 * determine if block ops are currently prohibited on the chain */
2799 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_CHANGE, errp)) {
2800 goto out;
2801 }
2802
2803 /* final sanity check */
2804 if (!bdrv_chain_contains(bs, image_bs)) {
2805 error_setg(errp, "'%s' and image file are not in the same chain",
2806 device);
2807 goto out;
2808 }
2809
2810 /* if not r/w, reopen to make r/w */
2811 open_flags = image_bs->open_flags;
2812 ro = bdrv_is_read_only(image_bs);
2813
2814 if (ro) {
2815 bdrv_reopen(image_bs, open_flags | BDRV_O_RDWR, &local_err);
2816 if (local_err) {
2817 error_propagate(errp, local_err);
2818 goto out;
2819 }
2820 }
2821
2822 ret = bdrv_change_backing_file(image_bs, backing_file,
2823 image_bs->drv ? image_bs->drv->format_name : "");
2824
2825 if (ret < 0) {
2826 error_setg_errno(errp, -ret, "Could not change backing file to '%s'",
2827 backing_file);
2828 /* don't exit here, so we can try to restore open flags if
2829 * appropriate */
2830 }
2831
2832 if (ro) {
2833 bdrv_reopen(image_bs, open_flags, &local_err);
2834 if (local_err) {
2835 error_propagate(errp, local_err); /* will preserve prior errp */
2836 }
2837 }
2838
2839 out:
2840 aio_context_release(aio_context);
2841 }
2842
2843 void qmp_blockdev_add(BlockdevOptions *options, Error **errp)
2844 {
2845 QmpOutputVisitor *ov = qmp_output_visitor_new();
2846 BlockBackend *blk;
2847 QObject *obj;
2848 QDict *qdict;
2849 Error *local_err = NULL;
2850
2851 /* Require an ID in the top level */
2852 if (!options->has_id) {
2853 error_setg(errp, "Block device needs an ID");
2854 goto fail;
2855 }
2856
2857 /* TODO Sort it out in raw-posix and drive_new(): Reject aio=native with
2858 * cache.direct=false instead of silently switching to aio=threads, except
2859 * when called from drive_new().
2860 *
2861 * For now, simply forbidding the combination for all drivers will do. */
2862 if (options->has_aio && options->aio == BLOCKDEV_AIO_OPTIONS_NATIVE) {
2863 bool direct = options->has_cache &&
2864 options->cache->has_direct &&
2865 options->cache->direct;
2866 if (!direct) {
2867 error_setg(errp, "aio=native requires cache.direct=true");
2868 goto fail;
2869 }
2870 }
2871
2872 visit_type_BlockdevOptions(qmp_output_get_visitor(ov),
2873 &options, NULL, &local_err);
2874 if (local_err) {
2875 error_propagate(errp, local_err);
2876 goto fail;
2877 }
2878
2879 obj = qmp_output_get_qobject(ov);
2880 qdict = qobject_to_qdict(obj);
2881
2882 qdict_flatten(qdict);
2883
2884 blk = blockdev_init(NULL, qdict, &local_err);
2885 if (local_err) {
2886 error_propagate(errp, local_err);
2887 goto fail;
2888 }
2889
2890 if (bdrv_key_required(blk_bs(blk))) {
2891 blk_unref(blk);
2892 error_setg(errp, "blockdev-add doesn't support encrypted devices");
2893 goto fail;
2894 }
2895
2896 fail:
2897 qmp_output_visitor_cleanup(ov);
2898 }
2899
2900 BlockJobInfoList *qmp_query_block_jobs(Error **errp)
2901 {
2902 BlockJobInfoList *head = NULL, **p_next = &head;
2903 BlockDriverState *bs;
2904
2905 for (bs = bdrv_next(NULL); bs; bs = bdrv_next(bs)) {
2906 AioContext *aio_context = bdrv_get_aio_context(bs);
2907
2908 aio_context_acquire(aio_context);
2909
2910 if (bs->job) {
2911 BlockJobInfoList *elem = g_new0(BlockJobInfoList, 1);
2912 elem->value = block_job_query(bs->job);
2913 *p_next = elem;
2914 p_next = &elem->next;
2915 }
2916
2917 aio_context_release(aio_context);
2918 }
2919
2920 return head;
2921 }
2922
2923 QemuOptsList qemu_common_drive_opts = {
2924 .name = "drive",
2925 .head = QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts.head),
2926 .desc = {
2927 {
2928 .name = "snapshot",
2929 .type = QEMU_OPT_BOOL,
2930 .help = "enable/disable snapshot mode",
2931 },{
2932 .name = "discard",
2933 .type = QEMU_OPT_STRING,
2934 .help = "discard operation (ignore/off, unmap/on)",
2935 },{
2936 .name = "cache.writeback",
2937 .type = QEMU_OPT_BOOL,
2938 .help = "enables writeback mode for any caches",
2939 },{
2940 .name = "cache.direct",
2941 .type = QEMU_OPT_BOOL,
2942 .help = "enables use of O_DIRECT (bypass the host page cache)",
2943 },{
2944 .name = "cache.no-flush",
2945 .type = QEMU_OPT_BOOL,
2946 .help = "ignore any flush requests for the device",
2947 },{
2948 .name = "aio",
2949 .type = QEMU_OPT_STRING,
2950 .help = "host AIO implementation (threads, native)",
2951 },{
2952 .name = "format",
2953 .type = QEMU_OPT_STRING,
2954 .help = "disk format (raw, qcow2, ...)",
2955 },{
2956 .name = "rerror",
2957 .type = QEMU_OPT_STRING,
2958 .help = "read error action",
2959 },{
2960 .name = "werror",
2961 .type = QEMU_OPT_STRING,
2962 .help = "write error action",
2963 },{
2964 .name = "read-only",
2965 .type = QEMU_OPT_BOOL,
2966 .help = "open drive file as read-only",
2967 },{
2968 .name = "throttling.iops-total",
2969 .type = QEMU_OPT_NUMBER,
2970 .help = "limit total I/O operations per second",
2971 },{
2972 .name = "throttling.iops-read",
2973 .type = QEMU_OPT_NUMBER,
2974 .help = "limit read operations per second",
2975 },{
2976 .name = "throttling.iops-write",
2977 .type = QEMU_OPT_NUMBER,
2978 .help = "limit write operations per second",
2979 },{
2980 .name = "throttling.bps-total",
2981 .type = QEMU_OPT_NUMBER,
2982 .help = "limit total bytes per second",
2983 },{
2984 .name = "throttling.bps-read",
2985 .type = QEMU_OPT_NUMBER,
2986 .help = "limit read bytes per second",
2987 },{
2988 .name = "throttling.bps-write",
2989 .type = QEMU_OPT_NUMBER,
2990 .help = "limit write bytes per second",
2991 },{
2992 .name = "throttling.iops-total-max",
2993 .type = QEMU_OPT_NUMBER,
2994 .help = "I/O operations burst",
2995 },{
2996 .name = "throttling.iops-read-max",
2997 .type = QEMU_OPT_NUMBER,
2998 .help = "I/O operations read burst",
2999 },{
3000 .name = "throttling.iops-write-max",
3001 .type = QEMU_OPT_NUMBER,
3002 .help = "I/O operations write burst",
3003 },{
3004 .name = "throttling.bps-total-max",
3005 .type = QEMU_OPT_NUMBER,
3006 .help = "total bytes burst",
3007 },{
3008 .name = "throttling.bps-read-max",
3009 .type = QEMU_OPT_NUMBER,
3010 .help = "total bytes read burst",
3011 },{
3012 .name = "throttling.bps-write-max",
3013 .type = QEMU_OPT_NUMBER,
3014 .help = "total bytes write burst",
3015 },{
3016 .name = "throttling.iops-size",
3017 .type = QEMU_OPT_NUMBER,
3018 .help = "when limiting by iops max size of an I/O in bytes",
3019 },{
3020 .name = "copy-on-read",
3021 .type = QEMU_OPT_BOOL,
3022 .help = "copy read data from backing file into image file",
3023 },{
3024 .name = "detect-zeroes",
3025 .type = QEMU_OPT_STRING,
3026 .help = "try to optimize zero writes (off, on, unmap)",
3027 },
3028 { /* end of list */ }
3029 },
3030 };
3031
3032 QemuOptsList qemu_drive_opts = {
3033 .name = "drive",
3034 .head = QTAILQ_HEAD_INITIALIZER(qemu_drive_opts.head),
3035 .desc = {
3036 /*
3037 * no elements => accept any params
3038 * validation will happen later
3039 */
3040 { /* end of list */ }
3041 },
3042 };
QEmu