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block: Prepare for NULL BDS
[qemu.git] / blockdev.c
blobc9271d2c96eb8b738d7aec0a5c5e521b81c0708a
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 "block/throttle-groups.h"
38 #include "monitor/monitor.h"
39 #include "qemu/error-report.h"
40 #include "qemu/option.h"
41 #include "qemu/config-file.h"
42 #include "qapi/qmp/types.h"
43 #include "qapi-visit.h"
44 #include "qapi/qmp/qerror.h"
45 #include "qapi/qmp-output-visitor.h"
46 #include "qapi/util.h"
47 #include "sysemu/sysemu.h"
48 #include "block/block_int.h"
49 #include "qmp-commands.h"
50 #include "trace.h"
51 #include "sysemu/arch_init.h"
52
53 static const char *const if_name[IF_COUNT] = {
54 [IF_NONE] = "none",
55 [IF_IDE] = "ide",
56 [IF_SCSI] = "scsi",
57 [IF_FLOPPY] = "floppy",
58 [IF_PFLASH] = "pflash",
59 [IF_MTD] = "mtd",
60 [IF_SD] = "sd",
61 [IF_VIRTIO] = "virtio",
62 [IF_XEN] = "xen",
63 };
64
65 static int if_max_devs[IF_COUNT] = {
66 /*
67 * Do not change these numbers! They govern how drive option
68 * index maps to unit and bus. That mapping is ABI.
69 *
70 * All controllers used to imlement if=T drives need to support
71 * if_max_devs[T] units, for any T with if_max_devs[T] != 0.
72 * Otherwise, some index values map to "impossible" bus, unit
73 * values.
74 *
75 * For instance, if you change [IF_SCSI] to 255, -drive
76 * if=scsi,index=12 no longer means bus=1,unit=5, but
77 * bus=0,unit=12. With an lsi53c895a controller (7 units max),
78 * the drive can't be set up. Regression.
79 */
80 [IF_IDE] = 2,
81 [IF_SCSI] = 7,
82 };
83
84 /**
85 * Boards may call this to offer board-by-board overrides
86 * of the default, global values.
87 */
88 void override_max_devs(BlockInterfaceType type, int max_devs)
89 {
90 BlockBackend *blk;
91 DriveInfo *dinfo;
92
93 if (max_devs <= 0) {
94 return;
95 }
96
97 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
98 dinfo = blk_legacy_dinfo(blk);
99 if (dinfo->type == type) {
100 fprintf(stderr, "Cannot override units-per-bus property of"
101 " the %s interface, because a drive of that type has"
102 " already been added.\n", if_name[type]);
103 g_assert_not_reached();
104 }
105 }
106
107 if_max_devs[type] = max_devs;
108 }
109
110 /*
111 * We automatically delete the drive when a device using it gets
112 * unplugged. Questionable feature, but we can't just drop it.
113 * Device models call blockdev_mark_auto_del() to schedule the
114 * automatic deletion, and generic qdev code calls blockdev_auto_del()
115 * when deletion is actually safe.
116 */
117 void blockdev_mark_auto_del(BlockBackend *blk)
118 {
119 DriveInfo *dinfo = blk_legacy_dinfo(blk);
120 BlockDriverState *bs = blk_bs(blk);
121 AioContext *aio_context;
122
123 if (!dinfo) {
124 return;
125 }
126
127 if (bs) {
128 aio_context = bdrv_get_aio_context(bs);
129 aio_context_acquire(aio_context);
130
131 if (bs->job) {
132 block_job_cancel(bs->job);
133 }
134
135 aio_context_release(aio_context);
136 }
137
138 dinfo->auto_del = 1;
139 }
140
141 void blockdev_auto_del(BlockBackend *blk)
142 {
143 DriveInfo *dinfo = blk_legacy_dinfo(blk);
144
145 if (dinfo && dinfo->auto_del) {
146 blk_unref(blk);
147 }
148 }
149
150 /**
151 * Returns the current mapping of how many units per bus
152 * a particular interface can support.
153 *
154 * A positive integer indicates n units per bus.
155 * 0 implies the mapping has not been established.
156 * -1 indicates an invalid BlockInterfaceType was given.
157 */
158 int drive_get_max_devs(BlockInterfaceType type)
159 {
160 if (type >= IF_IDE && type < IF_COUNT) {
161 return if_max_devs[type];
162 }
163
164 return -1;
165 }
166
167 static int drive_index_to_bus_id(BlockInterfaceType type, int index)
168 {
169 int max_devs = if_max_devs[type];
170 return max_devs ? index / max_devs : 0;
171 }
172
173 static int drive_index_to_unit_id(BlockInterfaceType type, int index)
174 {
175 int max_devs = if_max_devs[type];
176 return max_devs ? index % max_devs : index;
177 }
178
179 QemuOpts *drive_def(const char *optstr)
180 {
181 return qemu_opts_parse_noisily(qemu_find_opts("drive"), optstr, false);
182 }
183
184 QemuOpts *drive_add(BlockInterfaceType type, int index, const char *file,
185 const char *optstr)
186 {
187 QemuOpts *opts;
188
189 opts = drive_def(optstr);
190 if (!opts) {
191 return NULL;
192 }
193 if (type != IF_DEFAULT) {
194 qemu_opt_set(opts, "if", if_name[type], &error_abort);
195 }
196 if (index >= 0) {
197 qemu_opt_set_number(opts, "index", index, &error_abort);
198 }
199 if (file)
200 qemu_opt_set(opts, "file", file, &error_abort);
201 return opts;
202 }
203
204 DriveInfo *drive_get(BlockInterfaceType type, int bus, int unit)
205 {
206 BlockBackend *blk;
207 DriveInfo *dinfo;
208
209 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
210 dinfo = blk_legacy_dinfo(blk);
211 if (dinfo && dinfo->type == type
212 && dinfo->bus == bus && dinfo->unit == unit) {
213 return dinfo;
214 }
215 }
216
217 return NULL;
218 }
219
220 bool drive_check_orphaned(void)
221 {
222 BlockBackend *blk;
223 DriveInfo *dinfo;
224 bool rs = false;
225
226 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
227 dinfo = blk_legacy_dinfo(blk);
228 /* If dinfo->bdrv->dev is NULL, it has no device attached. */
229 /* Unless this is a default drive, this may be an oversight. */
230 if (!blk_get_attached_dev(blk) && !dinfo->is_default &&
231 dinfo->type != IF_NONE) {
232 fprintf(stderr, "Warning: Orphaned drive without device: "
233 "id=%s,file=%s,if=%s,bus=%d,unit=%d\n",
234 blk_name(blk), blk_bs(blk) ? blk_bs(blk)->filename : "",
235 if_name[dinfo->type], dinfo->bus, dinfo->unit);
236 rs = true;
237 }
238 }
239
240 return rs;
241 }
242
243 DriveInfo *drive_get_by_index(BlockInterfaceType type, int index)
244 {
245 return drive_get(type,
246 drive_index_to_bus_id(type, index),
247 drive_index_to_unit_id(type, index));
248 }
249
250 int drive_get_max_bus(BlockInterfaceType type)
251 {
252 int max_bus;
253 BlockBackend *blk;
254 DriveInfo *dinfo;
255
256 max_bus = -1;
257 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
258 dinfo = blk_legacy_dinfo(blk);
259 if (dinfo && dinfo->type == type && dinfo->bus > max_bus) {
260 max_bus = dinfo->bus;
261 }
262 }
263 return max_bus;
264 }
265
266 /* Get a block device. This should only be used for single-drive devices
267 (e.g. SD/Floppy/MTD). Multi-disk devices (scsi/ide) should use the
268 appropriate bus. */
269 DriveInfo *drive_get_next(BlockInterfaceType type)
270 {
271 static int next_block_unit[IF_COUNT];
272
273 return drive_get(type, 0, next_block_unit[type]++);
274 }
275
276 static void bdrv_format_print(void *opaque, const char *name)
277 {
278 error_printf(" %s", name);
279 }
280
281 typedef struct {
282 QEMUBH *bh;
283 BlockDriverState *bs;
284 } BDRVPutRefBH;
285
286 static void bdrv_put_ref_bh(void *opaque)
287 {
288 BDRVPutRefBH *s = opaque;
289
290 bdrv_unref(s->bs);
291 qemu_bh_delete(s->bh);
292 g_free(s);
293 }
294
295 /*
296 * Release a BDS reference in a BH
297 *
298 * It is not safe to use bdrv_unref() from a callback function when the callers
299 * still need the BlockDriverState. In such cases we schedule a BH to release
300 * the reference.
301 */
302 static void bdrv_put_ref_bh_schedule(BlockDriverState *bs)
303 {
304 BDRVPutRefBH *s;
305
306 s = g_new(BDRVPutRefBH, 1);
307 s->bh = qemu_bh_new(bdrv_put_ref_bh, s);
308 s->bs = bs;
309 qemu_bh_schedule(s->bh);
310 }
311
312 static int parse_block_error_action(const char *buf, bool is_read, Error **errp)
313 {
314 if (!strcmp(buf, "ignore")) {
315 return BLOCKDEV_ON_ERROR_IGNORE;
316 } else if (!is_read && !strcmp(buf, "enospc")) {
317 return BLOCKDEV_ON_ERROR_ENOSPC;
318 } else if (!strcmp(buf, "stop")) {
319 return BLOCKDEV_ON_ERROR_STOP;
320 } else if (!strcmp(buf, "report")) {
321 return BLOCKDEV_ON_ERROR_REPORT;
322 } else {
323 error_setg(errp, "'%s' invalid %s error action",
324 buf, is_read ? "read" : "write");
325 return -1;
326 }
327 }
328
329 static bool check_throttle_config(ThrottleConfig *cfg, Error **errp)
330 {
331 if (throttle_conflicting(cfg)) {
332 error_setg(errp, "bps/iops/max total values and read/write values"
333 " cannot be used at the same time");
334 return false;
335 }
336
337 if (!throttle_is_valid(cfg)) {
338 error_setg(errp, "bps/iops/maxs values must be 0 or greater");
339 return false;
340 }
341
342 if (throttle_max_is_missing_limit(cfg)) {
343 error_setg(errp, "bps_max/iops_max require corresponding"
344 " bps/iops values");
345 return false;
346 }
347
348 return true;
349 }
350
351 typedef enum { MEDIA_DISK, MEDIA_CDROM } DriveMediaType;
352
353 /* Takes the ownership of bs_opts */
354 static BlockBackend *blockdev_init(const char *file, QDict *bs_opts,
355 Error **errp)
356 {
357 const char *buf;
358 int ro = 0;
359 int bdrv_flags = 0;
360 int on_read_error, on_write_error;
361 BlockBackend *blk;
362 BlockDriverState *bs;
363 ThrottleConfig cfg;
364 int snapshot = 0;
365 bool copy_on_read;
366 Error *error = NULL;
367 QemuOpts *opts;
368 const char *id;
369 bool has_driver_specific_opts;
370 BlockdevDetectZeroesOptions detect_zeroes;
371 const char *throttling_group;
372
373 /* Check common options by copying from bs_opts to opts, all other options
374 * stay in bs_opts for processing by bdrv_open(). */
375 id = qdict_get_try_str(bs_opts, "id");
376 opts = qemu_opts_create(&qemu_common_drive_opts, id, 1, &error);
377 if (error) {
378 error_propagate(errp, error);
379 goto err_no_opts;
380 }
381
382 qemu_opts_absorb_qdict(opts, bs_opts, &error);
383 if (error) {
384 error_propagate(errp, error);
385 goto early_err;
386 }
387
388 if (id) {
389 qdict_del(bs_opts, "id");
390 }
391
392 has_driver_specific_opts = !!qdict_size(bs_opts);
393
394 /* extract parameters */
395 snapshot = qemu_opt_get_bool(opts, "snapshot", 0);
396 ro = qemu_opt_get_bool(opts, "read-only", 0);
397 copy_on_read = qemu_opt_get_bool(opts, "copy-on-read", false);
398
399 if ((buf = qemu_opt_get(opts, "discard")) != NULL) {
400 if (bdrv_parse_discard_flags(buf, &bdrv_flags) != 0) {
401 error_setg(errp, "invalid discard option");
402 goto early_err;
403 }
404 }
405
406 if (qemu_opt_get_bool(opts, BDRV_OPT_CACHE_WB, true)) {
407 bdrv_flags |= BDRV_O_CACHE_WB;
408 }
409 if (qemu_opt_get_bool(opts, BDRV_OPT_CACHE_DIRECT, false)) {
410 bdrv_flags |= BDRV_O_NOCACHE;
411 }
412 if (qemu_opt_get_bool(opts, BDRV_OPT_CACHE_NO_FLUSH, false)) {
413 bdrv_flags |= BDRV_O_NO_FLUSH;
414 }
415
416 if ((buf = qemu_opt_get(opts, "aio")) != NULL) {
417 if (!strcmp(buf, "native")) {
418 bdrv_flags |= BDRV_O_NATIVE_AIO;
419 } else if (!strcmp(buf, "threads")) {
420 /* this is the default */
421 } else {
422 error_setg(errp, "invalid aio option");
423 goto early_err;
424 }
425 }
426
427 if ((buf = qemu_opt_get(opts, "format")) != NULL) {
428 if (is_help_option(buf)) {
429 error_printf("Supported formats:");
430 bdrv_iterate_format(bdrv_format_print, NULL);
431 error_printf("\n");
432 goto early_err;
433 }
434
435 if (qdict_haskey(bs_opts, "driver")) {
436 error_setg(errp, "Cannot specify both 'driver' and 'format'");
437 goto early_err;
438 }
439 qdict_put(bs_opts, "driver", qstring_from_str(buf));
440 }
441
442 /* disk I/O throttling */
443 memset(&cfg, 0, sizeof(cfg));
444 cfg.buckets[THROTTLE_BPS_TOTAL].avg =
445 qemu_opt_get_number(opts, "throttling.bps-total", 0);
446 cfg.buckets[THROTTLE_BPS_READ].avg =
447 qemu_opt_get_number(opts, "throttling.bps-read", 0);
448 cfg.buckets[THROTTLE_BPS_WRITE].avg =
449 qemu_opt_get_number(opts, "throttling.bps-write", 0);
450 cfg.buckets[THROTTLE_OPS_TOTAL].avg =
451 qemu_opt_get_number(opts, "throttling.iops-total", 0);
452 cfg.buckets[THROTTLE_OPS_READ].avg =
453 qemu_opt_get_number(opts, "throttling.iops-read", 0);
454 cfg.buckets[THROTTLE_OPS_WRITE].avg =
455 qemu_opt_get_number(opts, "throttling.iops-write", 0);
456
457 cfg.buckets[THROTTLE_BPS_TOTAL].max =
458 qemu_opt_get_number(opts, "throttling.bps-total-max", 0);
459 cfg.buckets[THROTTLE_BPS_READ].max =
460 qemu_opt_get_number(opts, "throttling.bps-read-max", 0);
461 cfg.buckets[THROTTLE_BPS_WRITE].max =
462 qemu_opt_get_number(opts, "throttling.bps-write-max", 0);
463 cfg.buckets[THROTTLE_OPS_TOTAL].max =
464 qemu_opt_get_number(opts, "throttling.iops-total-max", 0);
465 cfg.buckets[THROTTLE_OPS_READ].max =
466 qemu_opt_get_number(opts, "throttling.iops-read-max", 0);
467 cfg.buckets[THROTTLE_OPS_WRITE].max =
468 qemu_opt_get_number(opts, "throttling.iops-write-max", 0);
469
470 cfg.op_size = qemu_opt_get_number(opts, "throttling.iops-size", 0);
471
472 throttling_group = qemu_opt_get(opts, "throttling.group");
473
474 if (!check_throttle_config(&cfg, &error)) {
475 error_propagate(errp, error);
476 goto early_err;
477 }
478
479 on_write_error = BLOCKDEV_ON_ERROR_ENOSPC;
480 if ((buf = qemu_opt_get(opts, "werror")) != NULL) {
481 on_write_error = parse_block_error_action(buf, 0, &error);
482 if (error) {
483 error_propagate(errp, error);
484 goto early_err;
485 }
486 }
487
488 on_read_error = BLOCKDEV_ON_ERROR_REPORT;
489 if ((buf = qemu_opt_get(opts, "rerror")) != NULL) {
490 on_read_error = parse_block_error_action(buf, 1, &error);
491 if (error) {
492 error_propagate(errp, error);
493 goto early_err;
494 }
495 }
496
497 detect_zeroes =
498 qapi_enum_parse(BlockdevDetectZeroesOptions_lookup,
499 qemu_opt_get(opts, "detect-zeroes"),
500 BLOCKDEV_DETECT_ZEROES_OPTIONS_MAX,
501 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF,
502 &error);
503 if (error) {
504 error_propagate(errp, error);
505 goto early_err;
506 }
507
508 if (detect_zeroes == BLOCKDEV_DETECT_ZEROES_OPTIONS_UNMAP &&
509 !(bdrv_flags & BDRV_O_UNMAP)) {
510 error_setg(errp, "setting detect-zeroes to unmap is not allowed "
511 "without setting discard operation to unmap");
512 goto early_err;
513 }
514
515 /* init */
516 if ((!file || !*file) && !has_driver_specific_opts) {
517 blk = blk_new_with_bs(qemu_opts_id(opts), errp);
518 if (!blk) {
519 goto early_err;
520 }
521
522 bs = blk_bs(blk);
523 bs->open_flags = snapshot ? BDRV_O_SNAPSHOT : 0;
524 bs->read_only = ro;
525
526 QDECREF(bs_opts);
527 } else {
528 if (file && !*file) {
529 file = NULL;
530 }
531
532 if (snapshot) {
533 /* always use cache=unsafe with snapshot */
534 bdrv_flags &= ~BDRV_O_CACHE_MASK;
535 bdrv_flags |= (BDRV_O_SNAPSHOT|BDRV_O_CACHE_WB|BDRV_O_NO_FLUSH);
536 }
537
538 if (copy_on_read) {
539 bdrv_flags |= BDRV_O_COPY_ON_READ;
540 }
541
542 bdrv_flags |= ro ? 0 : BDRV_O_RDWR;
543
544 blk = blk_new_open(qemu_opts_id(opts), file, NULL, bs_opts, bdrv_flags,
545 errp);
546 if (!blk) {
547 goto err_no_bs_opts;
548 }
549 bs = blk_bs(blk);
550 }
551
552 bs->detect_zeroes = detect_zeroes;
553
554 blk_set_on_error(blk, on_read_error, on_write_error);
555
556 /* disk I/O throttling */
557 if (throttle_enabled(&cfg)) {
558 if (!throttling_group) {
559 throttling_group = blk_name(blk);
560 }
561 bdrv_io_limits_enable(bs, throttling_group);
562 bdrv_set_io_limits(bs, &cfg);
563 }
564
565 if (bdrv_key_required(bs)) {
566 autostart = 0;
567 }
568
569 err_no_bs_opts:
570 qemu_opts_del(opts);
571 return blk;
572
573 early_err:
574 qemu_opts_del(opts);
575 err_no_opts:
576 QDECREF(bs_opts);
577 return NULL;
578 }
579
580 static void qemu_opt_rename(QemuOpts *opts, const char *from, const char *to,
581 Error **errp)
582 {
583 const char *value;
584
585 value = qemu_opt_get(opts, from);
586 if (value) {
587 if (qemu_opt_find(opts, to)) {
588 error_setg(errp, "'%s' and its alias '%s' can't be used at the "
589 "same time", to, from);
590 return;
591 }
592 }
593
594 /* rename all items in opts */
595 while ((value = qemu_opt_get(opts, from))) {
596 qemu_opt_set(opts, to, value, &error_abort);
597 qemu_opt_unset(opts, from);
598 }
599 }
600
601 QemuOptsList qemu_legacy_drive_opts = {
602 .name = "drive",
603 .head = QTAILQ_HEAD_INITIALIZER(qemu_legacy_drive_opts.head),
604 .desc = {
605 {
606 .name = "bus",
607 .type = QEMU_OPT_NUMBER,
608 .help = "bus number",
609 },{
610 .name = "unit",
611 .type = QEMU_OPT_NUMBER,
612 .help = "unit number (i.e. lun for scsi)",
613 },{
614 .name = "index",
615 .type = QEMU_OPT_NUMBER,
616 .help = "index number",
617 },{
618 .name = "media",
619 .type = QEMU_OPT_STRING,
620 .help = "media type (disk, cdrom)",
621 },{
622 .name = "if",
623 .type = QEMU_OPT_STRING,
624 .help = "interface (ide, scsi, sd, mtd, floppy, pflash, virtio)",
625 },{
626 .name = "cyls",
627 .type = QEMU_OPT_NUMBER,
628 .help = "number of cylinders (ide disk geometry)",
629 },{
630 .name = "heads",
631 .type = QEMU_OPT_NUMBER,
632 .help = "number of heads (ide disk geometry)",
633 },{
634 .name = "secs",
635 .type = QEMU_OPT_NUMBER,
636 .help = "number of sectors (ide disk geometry)",
637 },{
638 .name = "trans",
639 .type = QEMU_OPT_STRING,
640 .help = "chs translation (auto, lba, none)",
641 },{
642 .name = "boot",
643 .type = QEMU_OPT_BOOL,
644 .help = "(deprecated, ignored)",
645 },{
646 .name = "addr",
647 .type = QEMU_OPT_STRING,
648 .help = "pci address (virtio only)",
649 },{
650 .name = "serial",
651 .type = QEMU_OPT_STRING,
652 .help = "disk serial number",
653 },{
654 .name = "file",
655 .type = QEMU_OPT_STRING,
656 .help = "file name",
657 },
658
659 /* Options that are passed on, but have special semantics with -drive */
660 {
661 .name = "read-only",
662 .type = QEMU_OPT_BOOL,
663 .help = "open drive file as read-only",
664 },{
665 .name = "rerror",
666 .type = QEMU_OPT_STRING,
667 .help = "read error action",
668 },{
669 .name = "werror",
670 .type = QEMU_OPT_STRING,
671 .help = "write error action",
672 },{
673 .name = "copy-on-read",
674 .type = QEMU_OPT_BOOL,
675 .help = "copy read data from backing file into image file",
676 },
677
678 { /* end of list */ }
679 },
680 };
681
682 DriveInfo *drive_new(QemuOpts *all_opts, BlockInterfaceType block_default_type)
683 {
684 const char *value;
685 BlockBackend *blk;
686 DriveInfo *dinfo = NULL;
687 QDict *bs_opts;
688 QemuOpts *legacy_opts;
689 DriveMediaType media = MEDIA_DISK;
690 BlockInterfaceType type;
691 int cyls, heads, secs, translation;
692 int max_devs, bus_id, unit_id, index;
693 const char *devaddr;
694 const char *werror, *rerror;
695 bool read_only = false;
696 bool copy_on_read;
697 const char *serial;
698 const char *filename;
699 Error *local_err = NULL;
700 int i;
701
702 /* Change legacy command line options into QMP ones */
703 static const struct {
704 const char *from;
705 const char *to;
706 } opt_renames[] = {
707 { "iops", "throttling.iops-total" },
708 { "iops_rd", "throttling.iops-read" },
709 { "iops_wr", "throttling.iops-write" },
710
711 { "bps", "throttling.bps-total" },
712 { "bps_rd", "throttling.bps-read" },
713 { "bps_wr", "throttling.bps-write" },
714
715 { "iops_max", "throttling.iops-total-max" },
716 { "iops_rd_max", "throttling.iops-read-max" },
717 { "iops_wr_max", "throttling.iops-write-max" },
718
719 { "bps_max", "throttling.bps-total-max" },
720 { "bps_rd_max", "throttling.bps-read-max" },
721 { "bps_wr_max", "throttling.bps-write-max" },
722
723 { "iops_size", "throttling.iops-size" },
724
725 { "group", "throttling.group" },
726
727 { "readonly", "read-only" },
728 };
729
730 for (i = 0; i < ARRAY_SIZE(opt_renames); i++) {
731 qemu_opt_rename(all_opts, opt_renames[i].from, opt_renames[i].to,
732 &local_err);
733 if (local_err) {
734 error_report_err(local_err);
735 return NULL;
736 }
737 }
738
739 value = qemu_opt_get(all_opts, "cache");
740 if (value) {
741 int flags = 0;
742
743 if (bdrv_parse_cache_flags(value, &flags) != 0) {
744 error_report("invalid cache option");
745 return NULL;
746 }
747
748 /* Specific options take precedence */
749 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_WB)) {
750 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_WB,
751 !!(flags & BDRV_O_CACHE_WB), &error_abort);
752 }
753 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_DIRECT)) {
754 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_DIRECT,
755 !!(flags & BDRV_O_NOCACHE), &error_abort);
756 }
757 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_NO_FLUSH)) {
758 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_NO_FLUSH,
759 !!(flags & BDRV_O_NO_FLUSH), &error_abort);
760 }
761 qemu_opt_unset(all_opts, "cache");
762 }
763
764 /* Get a QDict for processing the options */
765 bs_opts = qdict_new();
766 qemu_opts_to_qdict(all_opts, bs_opts);
767
768 legacy_opts = qemu_opts_create(&qemu_legacy_drive_opts, NULL, 0,
769 &error_abort);
770 qemu_opts_absorb_qdict(legacy_opts, bs_opts, &local_err);
771 if (local_err) {
772 error_report_err(local_err);
773 goto fail;
774 }
775
776 /* Deprecated option boot=[on|off] */
777 if (qemu_opt_get(legacy_opts, "boot") != NULL) {
778 fprintf(stderr, "qemu-kvm: boot=on|off is deprecated and will be "
779 "ignored. Future versions will reject this parameter. Please "
780 "update your scripts.\n");
781 }
782
783 /* Media type */
784 value = qemu_opt_get(legacy_opts, "media");
785 if (value) {
786 if (!strcmp(value, "disk")) {
787 media = MEDIA_DISK;
788 } else if (!strcmp(value, "cdrom")) {
789 media = MEDIA_CDROM;
790 read_only = true;
791 } else {
792 error_report("'%s' invalid media", value);
793 goto fail;
794 }
795 }
796
797 /* copy-on-read is disabled with a warning for read-only devices */
798 read_only |= qemu_opt_get_bool(legacy_opts, "read-only", false);
799 copy_on_read = qemu_opt_get_bool(legacy_opts, "copy-on-read", false);
800
801 if (read_only && copy_on_read) {
802 error_report("warning: disabling copy-on-read on read-only drive");
803 copy_on_read = false;
804 }
805
806 qdict_put(bs_opts, "read-only",
807 qstring_from_str(read_only ? "on" : "off"));
808 qdict_put(bs_opts, "copy-on-read",
809 qstring_from_str(copy_on_read ? "on" :"off"));
810
811 /* Controller type */
812 value = qemu_opt_get(legacy_opts, "if");
813 if (value) {
814 for (type = 0;
815 type < IF_COUNT && strcmp(value, if_name[type]);
816 type++) {
817 }
818 if (type == IF_COUNT) {
819 error_report("unsupported bus type '%s'", value);
820 goto fail;
821 }
822 } else {
823 type = block_default_type;
824 }
825
826 /* Geometry */
827 cyls = qemu_opt_get_number(legacy_opts, "cyls", 0);
828 heads = qemu_opt_get_number(legacy_opts, "heads", 0);
829 secs = qemu_opt_get_number(legacy_opts, "secs", 0);
830
831 if (cyls || heads || secs) {
832 if (cyls < 1) {
833 error_report("invalid physical cyls number");
834 goto fail;
835 }
836 if (heads < 1) {
837 error_report("invalid physical heads number");
838 goto fail;
839 }
840 if (secs < 1) {
841 error_report("invalid physical secs number");
842 goto fail;
843 }
844 }
845
846 translation = BIOS_ATA_TRANSLATION_AUTO;
847 value = qemu_opt_get(legacy_opts, "trans");
848 if (value != NULL) {
849 if (!cyls) {
850 error_report("'%s' trans must be used with cyls, heads and secs",
851 value);
852 goto fail;
853 }
854 if (!strcmp(value, "none")) {
855 translation = BIOS_ATA_TRANSLATION_NONE;
856 } else if (!strcmp(value, "lba")) {
857 translation = BIOS_ATA_TRANSLATION_LBA;
858 } else if (!strcmp(value, "large")) {
859 translation = BIOS_ATA_TRANSLATION_LARGE;
860 } else if (!strcmp(value, "rechs")) {
861 translation = BIOS_ATA_TRANSLATION_RECHS;
862 } else if (!strcmp(value, "auto")) {
863 translation = BIOS_ATA_TRANSLATION_AUTO;
864 } else {
865 error_report("'%s' invalid translation type", value);
866 goto fail;
867 }
868 }
869
870 if (media == MEDIA_CDROM) {
871 if (cyls || secs || heads) {
872 error_report("CHS can't be set with media=cdrom");
873 goto fail;
874 }
875 }
876
877 /* Device address specified by bus/unit or index.
878 * If none was specified, try to find the first free one. */
879 bus_id = qemu_opt_get_number(legacy_opts, "bus", 0);
880 unit_id = qemu_opt_get_number(legacy_opts, "unit", -1);
881 index = qemu_opt_get_number(legacy_opts, "index", -1);
882
883 max_devs = if_max_devs[type];
884
885 if (index != -1) {
886 if (bus_id != 0 || unit_id != -1) {
887 error_report("index cannot be used with bus and unit");
888 goto fail;
889 }
890 bus_id = drive_index_to_bus_id(type, index);
891 unit_id = drive_index_to_unit_id(type, index);
892 }
893
894 if (unit_id == -1) {
895 unit_id = 0;
896 while (drive_get(type, bus_id, unit_id) != NULL) {
897 unit_id++;
898 if (max_devs && unit_id >= max_devs) {
899 unit_id -= max_devs;
900 bus_id++;
901 }
902 }
903 }
904
905 if (max_devs && unit_id >= max_devs) {
906 error_report("unit %d too big (max is %d)", unit_id, max_devs - 1);
907 goto fail;
908 }
909
910 if (drive_get(type, bus_id, unit_id) != NULL) {
911 error_report("drive with bus=%d, unit=%d (index=%d) exists",
912 bus_id, unit_id, index);
913 goto fail;
914 }
915
916 /* Serial number */
917 serial = qemu_opt_get(legacy_opts, "serial");
918
919 /* no id supplied -> create one */
920 if (qemu_opts_id(all_opts) == NULL) {
921 char *new_id;
922 const char *mediastr = "";
923 if (type == IF_IDE || type == IF_SCSI) {
924 mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd";
925 }
926 if (max_devs) {
927 new_id = g_strdup_printf("%s%i%s%i", if_name[type], bus_id,
928 mediastr, unit_id);
929 } else {
930 new_id = g_strdup_printf("%s%s%i", if_name[type],
931 mediastr, unit_id);
932 }
933 qdict_put(bs_opts, "id", qstring_from_str(new_id));
934 g_free(new_id);
935 }
936
937 /* Add virtio block device */
938 devaddr = qemu_opt_get(legacy_opts, "addr");
939 if (devaddr && type != IF_VIRTIO) {
940 error_report("addr is not supported by this bus type");
941 goto fail;
942 }
943
944 if (type == IF_VIRTIO) {
945 QemuOpts *devopts;
946 devopts = qemu_opts_create(qemu_find_opts("device"), NULL, 0,
947 &error_abort);
948 if (arch_type == QEMU_ARCH_S390X) {
949 qemu_opt_set(devopts, "driver", "virtio-blk-ccw", &error_abort);
950 } else {
951 qemu_opt_set(devopts, "driver", "virtio-blk-pci", &error_abort);
952 }
953 qemu_opt_set(devopts, "drive", qdict_get_str(bs_opts, "id"),
954 &error_abort);
955 if (devaddr) {
956 qemu_opt_set(devopts, "addr", devaddr, &error_abort);
957 }
958 }
959
960 filename = qemu_opt_get(legacy_opts, "file");
961
962 /* Check werror/rerror compatibility with if=... */
963 werror = qemu_opt_get(legacy_opts, "werror");
964 if (werror != NULL) {
965 if (type != IF_IDE && type != IF_SCSI && type != IF_VIRTIO &&
966 type != IF_NONE) {
967 error_report("werror is not supported by this bus type");
968 goto fail;
969 }
970 qdict_put(bs_opts, "werror", qstring_from_str(werror));
971 }
972
973 rerror = qemu_opt_get(legacy_opts, "rerror");
974 if (rerror != NULL) {
975 if (type != IF_IDE && type != IF_VIRTIO && type != IF_SCSI &&
976 type != IF_NONE) {
977 error_report("rerror is not supported by this bus type");
978 goto fail;
979 }
980 qdict_put(bs_opts, "rerror", qstring_from_str(rerror));
981 }
982
983 /* Actual block device init: Functionality shared with blockdev-add */
984 blk = blockdev_init(filename, bs_opts, &local_err);
985 bs_opts = NULL;
986 if (!blk) {
987 if (local_err) {
988 error_report_err(local_err);
989 }
990 goto fail;
991 } else {
992 assert(!local_err);
993 }
994
995 /* Create legacy DriveInfo */
996 dinfo = g_malloc0(sizeof(*dinfo));
997 dinfo->opts = all_opts;
998
999 dinfo->cyls = cyls;
1000 dinfo->heads = heads;
1001 dinfo->secs = secs;
1002 dinfo->trans = translation;
1003
1004 dinfo->type = type;
1005 dinfo->bus = bus_id;
1006 dinfo->unit = unit_id;
1007 dinfo->devaddr = devaddr;
1008 dinfo->serial = g_strdup(serial);
1009
1010 blk_set_legacy_dinfo(blk, dinfo);
1011
1012 switch(type) {
1013 case IF_IDE:
1014 case IF_SCSI:
1015 case IF_XEN:
1016 case IF_NONE:
1017 dinfo->media_cd = media == MEDIA_CDROM;
1018 break;
1019 default:
1020 break;
1021 }
1022
1023 fail:
1024 qemu_opts_del(legacy_opts);
1025 QDECREF(bs_opts);
1026 return dinfo;
1027 }
1028
1029 void hmp_commit(Monitor *mon, const QDict *qdict)
1030 {
1031 const char *device = qdict_get_str(qdict, "device");
1032 BlockBackend *blk;
1033 int ret;
1034
1035 if (!strcmp(device, "all")) {
1036 ret = bdrv_commit_all();
1037 } else {
1038 blk = blk_by_name(device);
1039 if (!blk) {
1040 monitor_printf(mon, "Device '%s' not found\n", device);
1041 return;
1042 }
1043 if (!blk_is_available(blk)) {
1044 monitor_printf(mon, "Device '%s' has no medium\n", device);
1045 return;
1046 }
1047 ret = bdrv_commit(blk_bs(blk));
1048 }
1049 if (ret < 0) {
1050 monitor_printf(mon, "'commit' error for '%s': %s\n", device,
1051 strerror(-ret));
1052 }
1053 }
1054
1055 static void blockdev_do_action(int kind, void *data, Error **errp)
1056 {
1057 TransactionAction action;
1058 TransactionActionList list;
1059
1060 action.kind = kind;
1061 action.data = data;
1062 list.value = &action;
1063 list.next = NULL;
1064 qmp_transaction(&list, errp);
1065 }
1066
1067 void qmp_blockdev_snapshot_sync(bool has_device, const char *device,
1068 bool has_node_name, const char *node_name,
1069 const char *snapshot_file,
1070 bool has_snapshot_node_name,
1071 const char *snapshot_node_name,
1072 bool has_format, const char *format,
1073 bool has_mode, NewImageMode mode, Error **errp)
1074 {
1075 BlockdevSnapshot snapshot = {
1076 .has_device = has_device,
1077 .device = (char *) device,
1078 .has_node_name = has_node_name,
1079 .node_name = (char *) node_name,
1080 .snapshot_file = (char *) snapshot_file,
1081 .has_snapshot_node_name = has_snapshot_node_name,
1082 .snapshot_node_name = (char *) snapshot_node_name,
1083 .has_format = has_format,
1084 .format = (char *) format,
1085 .has_mode = has_mode,
1086 .mode = mode,
1087 };
1088 blockdev_do_action(TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC,
1089 &snapshot, errp);
1090 }
1091
1092 void qmp_blockdev_snapshot_internal_sync(const char *device,
1093 const char *name,
1094 Error **errp)
1095 {
1096 BlockdevSnapshotInternal snapshot = {
1097 .device = (char *) device,
1098 .name = (char *) name
1099 };
1100
1101 blockdev_do_action(TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC,
1102 &snapshot, errp);
1103 }
1104
1105 SnapshotInfo *qmp_blockdev_snapshot_delete_internal_sync(const char *device,
1106 bool has_id,
1107 const char *id,
1108 bool has_name,
1109 const char *name,
1110 Error **errp)
1111 {
1112 BlockDriverState *bs;
1113 BlockBackend *blk;
1114 AioContext *aio_context;
1115 QEMUSnapshotInfo sn;
1116 Error *local_err = NULL;
1117 SnapshotInfo *info = NULL;
1118 int ret;
1119
1120 blk = blk_by_name(device);
1121 if (!blk) {
1122 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1123 "Device '%s' not found", device);
1124 return NULL;
1125 }
1126
1127 aio_context = blk_get_aio_context(blk);
1128 aio_context_acquire(aio_context);
1129
1130 if (!has_id) {
1131 id = NULL;
1132 }
1133
1134 if (!has_name) {
1135 name = NULL;
1136 }
1137
1138 if (!id && !name) {
1139 error_setg(errp, "Name or id must be provided");
1140 goto out_aio_context;
1141 }
1142
1143 if (!blk_is_available(blk)) {
1144 error_setg(errp, "Device '%s' has no medium", device);
1145 goto out_aio_context;
1146 }
1147 bs = blk_bs(blk);
1148
1149 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT_DELETE, errp)) {
1150 goto out_aio_context;
1151 }
1152
1153 ret = bdrv_snapshot_find_by_id_and_name(bs, id, name, &sn, &local_err);
1154 if (local_err) {
1155 error_propagate(errp, local_err);
1156 goto out_aio_context;
1157 }
1158 if (!ret) {
1159 error_setg(errp,
1160 "Snapshot with id '%s' and name '%s' does not exist on "
1161 "device '%s'",
1162 STR_OR_NULL(id), STR_OR_NULL(name), device);
1163 goto out_aio_context;
1164 }
1165
1166 bdrv_snapshot_delete(bs, id, name, &local_err);
1167 if (local_err) {
1168 error_propagate(errp, local_err);
1169 goto out_aio_context;
1170 }
1171
1172 aio_context_release(aio_context);
1173
1174 info = g_new0(SnapshotInfo, 1);
1175 info->id = g_strdup(sn.id_str);
1176 info->name = g_strdup(sn.name);
1177 info->date_nsec = sn.date_nsec;
1178 info->date_sec = sn.date_sec;
1179 info->vm_state_size = sn.vm_state_size;
1180 info->vm_clock_nsec = sn.vm_clock_nsec % 1000000000;
1181 info->vm_clock_sec = sn.vm_clock_nsec / 1000000000;
1182
1183 return info;
1184
1185 out_aio_context:
1186 aio_context_release(aio_context);
1187 return NULL;
1188 }
1189
1190 /**
1191 * block_dirty_bitmap_lookup:
1192 * Return a dirty bitmap (if present), after validating
1193 * the node reference and bitmap names.
1194 *
1195 * @node: The name of the BDS node to search for bitmaps
1196 * @name: The name of the bitmap to search for
1197 * @pbs: Output pointer for BDS lookup, if desired. Can be NULL.
1198 * @paio: Output pointer for aio_context acquisition, if desired. Can be NULL.
1199 * @errp: Output pointer for error information. Can be NULL.
1200 *
1201 * @return: A bitmap object on success, or NULL on failure.
1202 */
1203 static BdrvDirtyBitmap *block_dirty_bitmap_lookup(const char *node,
1204 const char *name,
1205 BlockDriverState **pbs,
1206 AioContext **paio,
1207 Error **errp)
1208 {
1209 BlockDriverState *bs;
1210 BdrvDirtyBitmap *bitmap;
1211 AioContext *aio_context;
1212
1213 if (!node) {
1214 error_setg(errp, "Node cannot be NULL");
1215 return NULL;
1216 }
1217 if (!name) {
1218 error_setg(errp, "Bitmap name cannot be NULL");
1219 return NULL;
1220 }
1221 bs = bdrv_lookup_bs(node, node, NULL);
1222 if (!bs) {
1223 error_setg(errp, "Node '%s' not found", node);
1224 return NULL;
1225 }
1226
1227 aio_context = bdrv_get_aio_context(bs);
1228 aio_context_acquire(aio_context);
1229
1230 bitmap = bdrv_find_dirty_bitmap(bs, name);
1231 if (!bitmap) {
1232 error_setg(errp, "Dirty bitmap '%s' not found", name);
1233 goto fail;
1234 }
1235
1236 if (pbs) {
1237 *pbs = bs;
1238 }
1239 if (paio) {
1240 *paio = aio_context;
1241 } else {
1242 aio_context_release(aio_context);
1243 }
1244
1245 return bitmap;
1246
1247 fail:
1248 aio_context_release(aio_context);
1249 return NULL;
1250 }
1251
1252 /* New and old BlockDriverState structs for atomic group operations */
1253
1254 typedef struct BlkTransactionState BlkTransactionState;
1255
1256 /* Only prepare() may fail. In a single transaction, only one of commit() or
1257 abort() will be called, clean() will always be called if it present. */
1258 typedef struct BdrvActionOps {
1259 /* Size of state struct, in bytes. */
1260 size_t instance_size;
1261 /* Prepare the work, must NOT be NULL. */
1262 void (*prepare)(BlkTransactionState *common, Error **errp);
1263 /* Commit the changes, can be NULL. */
1264 void (*commit)(BlkTransactionState *common);
1265 /* Abort the changes on fail, can be NULL. */
1266 void (*abort)(BlkTransactionState *common);
1267 /* Clean up resource in the end, can be NULL. */
1268 void (*clean)(BlkTransactionState *common);
1269 } BdrvActionOps;
1270
1271 /*
1272 * This structure must be arranged as first member in child type, assuming
1273 * that compiler will also arrange it to the same address with parent instance.
1274 * Later it will be used in free().
1275 */
1276 struct BlkTransactionState {
1277 TransactionAction *action;
1278 const BdrvActionOps *ops;
1279 QSIMPLEQ_ENTRY(BlkTransactionState) entry;
1280 };
1281
1282 /* internal snapshot private data */
1283 typedef struct InternalSnapshotState {
1284 BlkTransactionState common;
1285 BlockDriverState *bs;
1286 AioContext *aio_context;
1287 QEMUSnapshotInfo sn;
1288 } InternalSnapshotState;
1289
1290 static void internal_snapshot_prepare(BlkTransactionState *common,
1291 Error **errp)
1292 {
1293 Error *local_err = NULL;
1294 const char *device;
1295 const char *name;
1296 BlockBackend *blk;
1297 BlockDriverState *bs;
1298 QEMUSnapshotInfo old_sn, *sn;
1299 bool ret;
1300 qemu_timeval tv;
1301 BlockdevSnapshotInternal *internal;
1302 InternalSnapshotState *state;
1303 int ret1;
1304
1305 g_assert(common->action->kind ==
1306 TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC);
1307 internal = common->action->blockdev_snapshot_internal_sync;
1308 state = DO_UPCAST(InternalSnapshotState, common, common);
1309
1310 /* 1. parse input */
1311 device = internal->device;
1312 name = internal->name;
1313
1314 /* 2. check for validation */
1315 blk = blk_by_name(device);
1316 if (!blk) {
1317 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1318 "Device '%s' not found", device);
1319 return;
1320 }
1321
1322 /* AioContext is released in .clean() */
1323 state->aio_context = blk_get_aio_context(blk);
1324 aio_context_acquire(state->aio_context);
1325
1326 if (!blk_is_available(blk)) {
1327 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1328 return;
1329 }
1330 bs = blk_bs(blk);
1331
1332 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT, errp)) {
1333 return;
1334 }
1335
1336 if (bdrv_is_read_only(bs)) {
1337 error_setg(errp, "Device '%s' is read only", device);
1338 return;
1339 }
1340
1341 if (!bdrv_can_snapshot(bs)) {
1342 error_setg(errp, "Block format '%s' used by device '%s' "
1343 "does not support internal snapshots",
1344 bs->drv->format_name, device);
1345 return;
1346 }
1347
1348 if (!strlen(name)) {
1349 error_setg(errp, "Name is empty");
1350 return;
1351 }
1352
1353 /* check whether a snapshot with name exist */
1354 ret = bdrv_snapshot_find_by_id_and_name(bs, NULL, name, &old_sn,
1355 &local_err);
1356 if (local_err) {
1357 error_propagate(errp, local_err);
1358 return;
1359 } else if (ret) {
1360 error_setg(errp,
1361 "Snapshot with name '%s' already exists on device '%s'",
1362 name, device);
1363 return;
1364 }
1365
1366 /* 3. take the snapshot */
1367 sn = &state->sn;
1368 pstrcpy(sn->name, sizeof(sn->name), name);
1369 qemu_gettimeofday(&tv);
1370 sn->date_sec = tv.tv_sec;
1371 sn->date_nsec = tv.tv_usec * 1000;
1372 sn->vm_clock_nsec = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
1373
1374 ret1 = bdrv_snapshot_create(bs, sn);
1375 if (ret1 < 0) {
1376 error_setg_errno(errp, -ret1,
1377 "Failed to create snapshot '%s' on device '%s'",
1378 name, device);
1379 return;
1380 }
1381
1382 /* 4. succeed, mark a snapshot is created */
1383 state->bs = bs;
1384 }
1385
1386 static void internal_snapshot_abort(BlkTransactionState *common)
1387 {
1388 InternalSnapshotState *state =
1389 DO_UPCAST(InternalSnapshotState, common, common);
1390 BlockDriverState *bs = state->bs;
1391 QEMUSnapshotInfo *sn = &state->sn;
1392 Error *local_error = NULL;
1393
1394 if (!bs) {
1395 return;
1396 }
1397
1398 if (bdrv_snapshot_delete(bs, sn->id_str, sn->name, &local_error) < 0) {
1399 error_report("Failed to delete snapshot with id '%s' and name '%s' on "
1400 "device '%s' in abort: %s",
1401 sn->id_str,
1402 sn->name,
1403 bdrv_get_device_name(bs),
1404 error_get_pretty(local_error));
1405 error_free(local_error);
1406 }
1407 }
1408
1409 static void internal_snapshot_clean(BlkTransactionState *common)
1410 {
1411 InternalSnapshotState *state = DO_UPCAST(InternalSnapshotState,
1412 common, common);
1413
1414 if (state->aio_context) {
1415 aio_context_release(state->aio_context);
1416 }
1417 }
1418
1419 /* external snapshot private data */
1420 typedef struct ExternalSnapshotState {
1421 BlkTransactionState common;
1422 BlockDriverState *old_bs;
1423 BlockDriverState *new_bs;
1424 AioContext *aio_context;
1425 } ExternalSnapshotState;
1426
1427 static void external_snapshot_prepare(BlkTransactionState *common,
1428 Error **errp)
1429 {
1430 int flags, ret;
1431 QDict *options;
1432 Error *local_err = NULL;
1433 bool has_device = false;
1434 const char *device;
1435 bool has_node_name = false;
1436 const char *node_name;
1437 bool has_snapshot_node_name = false;
1438 const char *snapshot_node_name;
1439 const char *new_image_file;
1440 const char *format = "qcow2";
1441 enum NewImageMode mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
1442 ExternalSnapshotState *state =
1443 DO_UPCAST(ExternalSnapshotState, common, common);
1444 TransactionAction *action = common->action;
1445
1446 /* get parameters */
1447 g_assert(action->kind == TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC);
1448
1449 has_device = action->blockdev_snapshot_sync->has_device;
1450 device = action->blockdev_snapshot_sync->device;
1451 has_node_name = action->blockdev_snapshot_sync->has_node_name;
1452 node_name = action->blockdev_snapshot_sync->node_name;
1453 has_snapshot_node_name =
1454 action->blockdev_snapshot_sync->has_snapshot_node_name;
1455 snapshot_node_name = action->blockdev_snapshot_sync->snapshot_node_name;
1456
1457 new_image_file = action->blockdev_snapshot_sync->snapshot_file;
1458 if (action->blockdev_snapshot_sync->has_format) {
1459 format = action->blockdev_snapshot_sync->format;
1460 }
1461 if (action->blockdev_snapshot_sync->has_mode) {
1462 mode = action->blockdev_snapshot_sync->mode;
1463 }
1464
1465 /* start processing */
1466 state->old_bs = bdrv_lookup_bs(has_device ? device : NULL,
1467 has_node_name ? node_name : NULL,
1468 &local_err);
1469 if (local_err) {
1470 error_propagate(errp, local_err);
1471 return;
1472 }
1473
1474 if (has_node_name && !has_snapshot_node_name) {
1475 error_setg(errp, "New snapshot node name missing");
1476 return;
1477 }
1478
1479 if (has_snapshot_node_name && bdrv_find_node(snapshot_node_name)) {
1480 error_setg(errp, "New snapshot node name already existing");
1481 return;
1482 }
1483
1484 /* Acquire AioContext now so any threads operating on old_bs stop */
1485 state->aio_context = bdrv_get_aio_context(state->old_bs);
1486 aio_context_acquire(state->aio_context);
1487
1488 if (!bdrv_is_inserted(state->old_bs)) {
1489 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1490 return;
1491 }
1492
1493 if (bdrv_op_is_blocked(state->old_bs,
1494 BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT, errp)) {
1495 return;
1496 }
1497
1498 if (!bdrv_is_read_only(state->old_bs)) {
1499 if (bdrv_flush(state->old_bs)) {
1500 error_setg(errp, QERR_IO_ERROR);
1501 return;
1502 }
1503 }
1504
1505 if (!bdrv_is_first_non_filter(state->old_bs)) {
1506 error_setg(errp, QERR_FEATURE_DISABLED, "snapshot");
1507 return;
1508 }
1509
1510 flags = state->old_bs->open_flags;
1511
1512 /* create new image w/backing file */
1513 if (mode != NEW_IMAGE_MODE_EXISTING) {
1514 bdrv_img_create(new_image_file, format,
1515 state->old_bs->filename,
1516 state->old_bs->drv->format_name,
1517 NULL, -1, flags, &local_err, false);
1518 if (local_err) {
1519 error_propagate(errp, local_err);
1520 return;
1521 }
1522 }
1523
1524 options = qdict_new();
1525 if (has_snapshot_node_name) {
1526 qdict_put(options, "node-name",
1527 qstring_from_str(snapshot_node_name));
1528 }
1529 qdict_put(options, "driver", qstring_from_str(format));
1530
1531 /* TODO Inherit bs->options or only take explicit options with an
1532 * extended QMP command? */
1533 assert(state->new_bs == NULL);
1534 ret = bdrv_open(&state->new_bs, new_image_file, NULL, options,
1535 flags | BDRV_O_NO_BACKING, &local_err);
1536 /* We will manually add the backing_hd field to the bs later */
1537 if (ret != 0) {
1538 error_propagate(errp, local_err);
1539 }
1540 }
1541
1542 static void external_snapshot_commit(BlkTransactionState *common)
1543 {
1544 ExternalSnapshotState *state =
1545 DO_UPCAST(ExternalSnapshotState, common, common);
1546
1547 bdrv_set_aio_context(state->new_bs, state->aio_context);
1548
1549 /* This removes our old bs and adds the new bs */
1550 bdrv_append(state->new_bs, state->old_bs);
1551 /* We don't need (or want) to use the transactional
1552 * bdrv_reopen_multiple() across all the entries at once, because we
1553 * don't want to abort all of them if one of them fails the reopen */
1554 bdrv_reopen(state->old_bs, state->old_bs->open_flags & ~BDRV_O_RDWR,
1555 NULL);
1556
1557 aio_context_release(state->aio_context);
1558 }
1559
1560 static void external_snapshot_abort(BlkTransactionState *common)
1561 {
1562 ExternalSnapshotState *state =
1563 DO_UPCAST(ExternalSnapshotState, common, common);
1564 if (state->new_bs) {
1565 bdrv_unref(state->new_bs);
1566 }
1567 if (state->aio_context) {
1568 aio_context_release(state->aio_context);
1569 }
1570 }
1571
1572 typedef struct DriveBackupState {
1573 BlkTransactionState common;
1574 BlockDriverState *bs;
1575 AioContext *aio_context;
1576 BlockJob *job;
1577 } DriveBackupState;
1578
1579 static void drive_backup_prepare(BlkTransactionState *common, Error **errp)
1580 {
1581 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1582 BlockBackend *blk;
1583 DriveBackup *backup;
1584 Error *local_err = NULL;
1585
1586 assert(common->action->kind == TRANSACTION_ACTION_KIND_DRIVE_BACKUP);
1587 backup = common->action->drive_backup;
1588
1589 blk = blk_by_name(backup->device);
1590 if (!blk) {
1591 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1592 "Device '%s' not found", backup->device);
1593 return;
1594 }
1595
1596 /* AioContext is released in .clean() */
1597 state->aio_context = blk_get_aio_context(blk);
1598 aio_context_acquire(state->aio_context);
1599
1600 qmp_drive_backup(backup->device, backup->target,
1601 backup->has_format, backup->format,
1602 backup->sync,
1603 backup->has_mode, backup->mode,
1604 backup->has_speed, backup->speed,
1605 backup->has_bitmap, backup->bitmap,
1606 backup->has_on_source_error, backup->on_source_error,
1607 backup->has_on_target_error, backup->on_target_error,
1608 &local_err);
1609 if (local_err) {
1610 error_propagate(errp, local_err);
1611 return;
1612 }
1613
1614 state->bs = blk_bs(blk);
1615 state->job = state->bs->job;
1616 }
1617
1618 static void drive_backup_abort(BlkTransactionState *common)
1619 {
1620 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1621 BlockDriverState *bs = state->bs;
1622
1623 /* Only cancel if it's the job we started */
1624 if (bs && bs->job && bs->job == state->job) {
1625 block_job_cancel_sync(bs->job);
1626 }
1627 }
1628
1629 static void drive_backup_clean(BlkTransactionState *common)
1630 {
1631 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1632
1633 if (state->aio_context) {
1634 aio_context_release(state->aio_context);
1635 }
1636 }
1637
1638 typedef struct BlockdevBackupState {
1639 BlkTransactionState common;
1640 BlockDriverState *bs;
1641 BlockJob *job;
1642 AioContext *aio_context;
1643 } BlockdevBackupState;
1644
1645 static void blockdev_backup_prepare(BlkTransactionState *common, Error **errp)
1646 {
1647 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
1648 BlockdevBackup *backup;
1649 BlockBackend *blk, *target;
1650 Error *local_err = NULL;
1651
1652 assert(common->action->kind == TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP);
1653 backup = common->action->blockdev_backup;
1654
1655 blk = blk_by_name(backup->device);
1656 if (!blk) {
1657 error_setg(errp, "Device '%s' not found", backup->device);
1658 return;
1659 }
1660
1661 target = blk_by_name(backup->target);
1662 if (!target) {
1663 error_setg(errp, "Device '%s' not found", backup->target);
1664 return;
1665 }
1666
1667 /* AioContext is released in .clean() */
1668 state->aio_context = blk_get_aio_context(blk);
1669 if (state->aio_context != blk_get_aio_context(target)) {
1670 state->aio_context = NULL;
1671 error_setg(errp, "Backup between two IO threads is not implemented");
1672 return;
1673 }
1674 aio_context_acquire(state->aio_context);
1675
1676 qmp_blockdev_backup(backup->device, backup->target,
1677 backup->sync,
1678 backup->has_speed, backup->speed,
1679 backup->has_on_source_error, backup->on_source_error,
1680 backup->has_on_target_error, backup->on_target_error,
1681 &local_err);
1682 if (local_err) {
1683 error_propagate(errp, local_err);
1684 return;
1685 }
1686
1687 state->bs = blk_bs(blk);
1688 state->job = state->bs->job;
1689 }
1690
1691 static void blockdev_backup_abort(BlkTransactionState *common)
1692 {
1693 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
1694 BlockDriverState *bs = state->bs;
1695
1696 /* Only cancel if it's the job we started */
1697 if (bs && bs->job && bs->job == state->job) {
1698 block_job_cancel_sync(bs->job);
1699 }
1700 }
1701
1702 static void blockdev_backup_clean(BlkTransactionState *common)
1703 {
1704 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
1705
1706 if (state->aio_context) {
1707 aio_context_release(state->aio_context);
1708 }
1709 }
1710
1711 static void abort_prepare(BlkTransactionState *common, Error **errp)
1712 {
1713 error_setg(errp, "Transaction aborted using Abort action");
1714 }
1715
1716 static void abort_commit(BlkTransactionState *common)
1717 {
1718 g_assert_not_reached(); /* this action never succeeds */
1719 }
1720
1721 static const BdrvActionOps actions[] = {
1722 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC] = {
1723 .instance_size = sizeof(ExternalSnapshotState),
1724 .prepare = external_snapshot_prepare,
1725 .commit = external_snapshot_commit,
1726 .abort = external_snapshot_abort,
1727 },
1728 [TRANSACTION_ACTION_KIND_DRIVE_BACKUP] = {
1729 .instance_size = sizeof(DriveBackupState),
1730 .prepare = drive_backup_prepare,
1731 .abort = drive_backup_abort,
1732 .clean = drive_backup_clean,
1733 },
1734 [TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP] = {
1735 .instance_size = sizeof(BlockdevBackupState),
1736 .prepare = blockdev_backup_prepare,
1737 .abort = blockdev_backup_abort,
1738 .clean = blockdev_backup_clean,
1739 },
1740 [TRANSACTION_ACTION_KIND_ABORT] = {
1741 .instance_size = sizeof(BlkTransactionState),
1742 .prepare = abort_prepare,
1743 .commit = abort_commit,
1744 },
1745 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC] = {
1746 .instance_size = sizeof(InternalSnapshotState),
1747 .prepare = internal_snapshot_prepare,
1748 .abort = internal_snapshot_abort,
1749 .clean = internal_snapshot_clean,
1750 },
1751 };
1752
1753 /*
1754 * 'Atomic' group operations. The operations are performed as a set, and if
1755 * any fail then we roll back all operations in the group.
1756 */
1757 void qmp_transaction(TransactionActionList *dev_list, Error **errp)
1758 {
1759 TransactionActionList *dev_entry = dev_list;
1760 BlkTransactionState *state, *next;
1761 Error *local_err = NULL;
1762
1763 QSIMPLEQ_HEAD(snap_bdrv_states, BlkTransactionState) snap_bdrv_states;
1764 QSIMPLEQ_INIT(&snap_bdrv_states);
1765
1766 /* drain all i/o before any operations */
1767 bdrv_drain_all();
1768
1769 /* We don't do anything in this loop that commits us to the operations */
1770 while (NULL != dev_entry) {
1771 TransactionAction *dev_info = NULL;
1772 const BdrvActionOps *ops;
1773
1774 dev_info = dev_entry->value;
1775 dev_entry = dev_entry->next;
1776
1777 assert(dev_info->kind < ARRAY_SIZE(actions));
1778
1779 ops = &actions[dev_info->kind];
1780 assert(ops->instance_size > 0);
1781
1782 state = g_malloc0(ops->instance_size);
1783 state->ops = ops;
1784 state->action = dev_info;
1785 QSIMPLEQ_INSERT_TAIL(&snap_bdrv_states, state, entry);
1786
1787 state->ops->prepare(state, &local_err);
1788 if (local_err) {
1789 error_propagate(errp, local_err);
1790 goto delete_and_fail;
1791 }
1792 }
1793
1794 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) {
1795 if (state->ops->commit) {
1796 state->ops->commit(state);
1797 }
1798 }
1799
1800 /* success */
1801 goto exit;
1802
1803 delete_and_fail:
1804 /* failure, and it is all-or-none; roll back all operations */
1805 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) {
1806 if (state->ops->abort) {
1807 state->ops->abort(state);
1808 }
1809 }
1810 exit:
1811 QSIMPLEQ_FOREACH_SAFE(state, &snap_bdrv_states, entry, next) {
1812 if (state->ops->clean) {
1813 state->ops->clean(state);
1814 }
1815 g_free(state);
1816 }
1817 }
1818
1819
1820 static void eject_device(BlockBackend *blk, int force, Error **errp)
1821 {
1822 BlockDriverState *bs = blk_bs(blk);
1823 AioContext *aio_context;
1824
1825 if (!bs) {
1826 /* No medium inserted, so there is nothing to do */
1827 return;
1828 }
1829
1830 aio_context = bdrv_get_aio_context(bs);
1831 aio_context_acquire(aio_context);
1832
1833 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_EJECT, errp)) {
1834 goto out;
1835 }
1836 if (!blk_dev_has_removable_media(blk)) {
1837 error_setg(errp, "Device '%s' is not removable",
1838 bdrv_get_device_name(bs));
1839 goto out;
1840 }
1841
1842 if (blk_dev_is_medium_locked(blk) && !blk_dev_is_tray_open(blk)) {
1843 blk_dev_eject_request(blk, force);
1844 if (!force) {
1845 error_setg(errp, "Device '%s' is locked",
1846 bdrv_get_device_name(bs));
1847 goto out;
1848 }
1849 }
1850
1851 bdrv_close(bs);
1852
1853 out:
1854 aio_context_release(aio_context);
1855 }
1856
1857 void qmp_eject(const char *device, bool has_force, bool force, Error **errp)
1858 {
1859 BlockBackend *blk;
1860
1861 blk = blk_by_name(device);
1862 if (!blk) {
1863 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1864 "Device '%s' not found", device);
1865 return;
1866 }
1867
1868 eject_device(blk, force, errp);
1869 }
1870
1871 void qmp_block_passwd(bool has_device, const char *device,
1872 bool has_node_name, const char *node_name,
1873 const char *password, Error **errp)
1874 {
1875 Error *local_err = NULL;
1876 BlockDriverState *bs;
1877 AioContext *aio_context;
1878
1879 bs = bdrv_lookup_bs(has_device ? device : NULL,
1880 has_node_name ? node_name : NULL,
1881 &local_err);
1882 if (local_err) {
1883 error_propagate(errp, local_err);
1884 return;
1885 }
1886
1887 aio_context = bdrv_get_aio_context(bs);
1888 aio_context_acquire(aio_context);
1889
1890 bdrv_add_key(bs, password, errp);
1891
1892 aio_context_release(aio_context);
1893 }
1894
1895 /* Assumes AioContext is held */
1896 static void qmp_bdrv_open_encrypted(BlockDriverState **pbs,
1897 const char *filename,
1898 int bdrv_flags, const char *format,
1899 const char *password, Error **errp)
1900 {
1901 Error *local_err = NULL;
1902 QDict *options = NULL;
1903 int ret;
1904
1905 if (format) {
1906 options = qdict_new();
1907 qdict_put(options, "driver", qstring_from_str(format));
1908 }
1909
1910 ret = bdrv_open(pbs, filename, NULL, options, bdrv_flags, &local_err);
1911 if (ret < 0) {
1912 error_propagate(errp, local_err);
1913 return;
1914 }
1915
1916 bdrv_add_key(*pbs, password, errp);
1917 }
1918
1919 void qmp_change_blockdev(const char *device, const char *filename,
1920 const char *format, Error **errp)
1921 {
1922 BlockBackend *blk;
1923 BlockDriverState *bs;
1924 AioContext *aio_context;
1925 int bdrv_flags;
1926 bool new_bs;
1927 Error *err = NULL;
1928
1929 blk = blk_by_name(device);
1930 if (!blk) {
1931 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1932 "Device '%s' not found", device);
1933 return;
1934 }
1935 bs = blk_bs(blk);
1936 new_bs = !bs;
1937
1938 aio_context = blk_get_aio_context(blk);
1939 aio_context_acquire(aio_context);
1940
1941 eject_device(blk, 0, &err);
1942 if (err) {
1943 error_propagate(errp, err);
1944 goto out;
1945 }
1946
1947 bdrv_flags = blk_is_read_only(blk) ? 0 : BDRV_O_RDWR;
1948 bdrv_flags |= blk_get_root_state(blk)->open_flags & ~BDRV_O_RDWR;
1949
1950 qmp_bdrv_open_encrypted(&bs, filename, bdrv_flags, format, NULL, &err);
1951 if (err) {
1952 error_propagate(errp, err);
1953 goto out;
1954 }
1955
1956 if (new_bs) {
1957 blk_insert_bs(blk, bs);
1958 /* Has been sent automatically by bdrv_open() if blk_bs(blk) was not
1959 * NULL */
1960 blk_dev_change_media_cb(blk, true);
1961 }
1962
1963 out:
1964 aio_context_release(aio_context);
1965 }
1966
1967 /* throttling disk I/O limits */
1968 void qmp_block_set_io_throttle(const char *device, int64_t bps, int64_t bps_rd,
1969 int64_t bps_wr,
1970 int64_t iops,
1971 int64_t iops_rd,
1972 int64_t iops_wr,
1973 bool has_bps_max,
1974 int64_t bps_max,
1975 bool has_bps_rd_max,
1976 int64_t bps_rd_max,
1977 bool has_bps_wr_max,
1978 int64_t bps_wr_max,
1979 bool has_iops_max,
1980 int64_t iops_max,
1981 bool has_iops_rd_max,
1982 int64_t iops_rd_max,
1983 bool has_iops_wr_max,
1984 int64_t iops_wr_max,
1985 bool has_iops_size,
1986 int64_t iops_size,
1987 bool has_group,
1988 const char *group, Error **errp)
1989 {
1990 ThrottleConfig cfg;
1991 BlockDriverState *bs;
1992 BlockBackend *blk;
1993 AioContext *aio_context;
1994
1995 blk = blk_by_name(device);
1996 if (!blk) {
1997 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1998 "Device '%s' not found", device);
1999 return;
2000 }
2001
2002 aio_context = blk_get_aio_context(blk);
2003 aio_context_acquire(aio_context);
2004
2005 bs = blk_bs(blk);
2006 if (!bs) {
2007 error_setg(errp, "Device '%s' has no medium", device);
2008 goto out;
2009 }
2010
2011 memset(&cfg, 0, sizeof(cfg));
2012 cfg.buckets[THROTTLE_BPS_TOTAL].avg = bps;
2013 cfg.buckets[THROTTLE_BPS_READ].avg = bps_rd;
2014 cfg.buckets[THROTTLE_BPS_WRITE].avg = bps_wr;
2015
2016 cfg.buckets[THROTTLE_OPS_TOTAL].avg = iops;
2017 cfg.buckets[THROTTLE_OPS_READ].avg = iops_rd;
2018 cfg.buckets[THROTTLE_OPS_WRITE].avg = iops_wr;
2019
2020 if (has_bps_max) {
2021 cfg.buckets[THROTTLE_BPS_TOTAL].max = bps_max;
2022 }
2023 if (has_bps_rd_max) {
2024 cfg.buckets[THROTTLE_BPS_READ].max = bps_rd_max;
2025 }
2026 if (has_bps_wr_max) {
2027 cfg.buckets[THROTTLE_BPS_WRITE].max = bps_wr_max;
2028 }
2029 if (has_iops_max) {
2030 cfg.buckets[THROTTLE_OPS_TOTAL].max = iops_max;
2031 }
2032 if (has_iops_rd_max) {
2033 cfg.buckets[THROTTLE_OPS_READ].max = iops_rd_max;
2034 }
2035 if (has_iops_wr_max) {
2036 cfg.buckets[THROTTLE_OPS_WRITE].max = iops_wr_max;
2037 }
2038
2039 if (has_iops_size) {
2040 cfg.op_size = iops_size;
2041 }
2042
2043 if (!check_throttle_config(&cfg, errp)) {
2044 goto out;
2045 }
2046
2047 if (throttle_enabled(&cfg)) {
2048 /* Enable I/O limits if they're not enabled yet, otherwise
2049 * just update the throttling group. */
2050 if (!bs->io_limits_enabled) {
2051 bdrv_io_limits_enable(bs, has_group ? group : device);
2052 } else if (has_group) {
2053 bdrv_io_limits_update_group(bs, group);
2054 }
2055 /* Set the new throttling configuration */
2056 bdrv_set_io_limits(bs, &cfg);
2057 } else if (bs->io_limits_enabled) {
2058 /* If all throttling settings are set to 0, disable I/O limits */
2059 bdrv_io_limits_disable(bs);
2060 }
2061
2062 out:
2063 aio_context_release(aio_context);
2064 }
2065
2066 void qmp_block_dirty_bitmap_add(const char *node, const char *name,
2067 bool has_granularity, uint32_t granularity,
2068 Error **errp)
2069 {
2070 AioContext *aio_context;
2071 BlockDriverState *bs;
2072
2073 if (!name || name[0] == '\0') {
2074 error_setg(errp, "Bitmap name cannot be empty");
2075 return;
2076 }
2077
2078 bs = bdrv_lookup_bs(node, node, errp);
2079 if (!bs) {
2080 return;
2081 }
2082
2083 aio_context = bdrv_get_aio_context(bs);
2084 aio_context_acquire(aio_context);
2085
2086 if (has_granularity) {
2087 if (granularity < 512 || !is_power_of_2(granularity)) {
2088 error_setg(errp, "Granularity must be power of 2 "
2089 "and at least 512");
2090 goto out;
2091 }
2092 } else {
2093 /* Default to cluster size, if available: */
2094 granularity = bdrv_get_default_bitmap_granularity(bs);
2095 }
2096
2097 bdrv_create_dirty_bitmap(bs, granularity, name, errp);
2098
2099 out:
2100 aio_context_release(aio_context);
2101 }
2102
2103 void qmp_block_dirty_bitmap_remove(const char *node, const char *name,
2104 Error **errp)
2105 {
2106 AioContext *aio_context;
2107 BlockDriverState *bs;
2108 BdrvDirtyBitmap *bitmap;
2109
2110 bitmap = block_dirty_bitmap_lookup(node, name, &bs, &aio_context, errp);
2111 if (!bitmap || !bs) {
2112 return;
2113 }
2114
2115 if (bdrv_dirty_bitmap_frozen(bitmap)) {
2116 error_setg(errp,
2117 "Bitmap '%s' is currently frozen and cannot be removed",
2118 name);
2119 goto out;
2120 }
2121 bdrv_dirty_bitmap_make_anon(bitmap);
2122 bdrv_release_dirty_bitmap(bs, bitmap);
2123
2124 out:
2125 aio_context_release(aio_context);
2126 }
2127
2128 /**
2129 * Completely clear a bitmap, for the purposes of synchronizing a bitmap
2130 * immediately after a full backup operation.
2131 */
2132 void qmp_block_dirty_bitmap_clear(const char *node, const char *name,
2133 Error **errp)
2134 {
2135 AioContext *aio_context;
2136 BdrvDirtyBitmap *bitmap;
2137 BlockDriverState *bs;
2138
2139 bitmap = block_dirty_bitmap_lookup(node, name, &bs, &aio_context, errp);
2140 if (!bitmap || !bs) {
2141 return;
2142 }
2143
2144 if (bdrv_dirty_bitmap_frozen(bitmap)) {
2145 error_setg(errp,
2146 "Bitmap '%s' is currently frozen and cannot be modified",
2147 name);
2148 goto out;
2149 } else if (!bdrv_dirty_bitmap_enabled(bitmap)) {
2150 error_setg(errp,
2151 "Bitmap '%s' is currently disabled and cannot be cleared",
2152 name);
2153 goto out;
2154 }
2155
2156 bdrv_clear_dirty_bitmap(bitmap);
2157
2158 out:
2159 aio_context_release(aio_context);
2160 }
2161
2162 void hmp_drive_del(Monitor *mon, const QDict *qdict)
2163 {
2164 const char *id = qdict_get_str(qdict, "id");
2165 BlockBackend *blk;
2166 BlockDriverState *bs;
2167 AioContext *aio_context;
2168 Error *local_err = NULL;
2169
2170 blk = blk_by_name(id);
2171 if (!blk) {
2172 error_report("Device '%s' not found", id);
2173 return;
2174 }
2175
2176 if (!blk_legacy_dinfo(blk)) {
2177 error_report("Deleting device added with blockdev-add"
2178 " is not supported");
2179 return;
2180 }
2181
2182 aio_context = blk_get_aio_context(blk);
2183 aio_context_acquire(aio_context);
2184
2185 bs = blk_bs(blk);
2186 if (bs) {
2187 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_DRIVE_DEL, &local_err)) {
2188 error_report_err(local_err);
2189 aio_context_release(aio_context);
2190 return;
2191 }
2192
2193 bdrv_close(bs);
2194 }
2195
2196 /* if we have a device attached to this BlockDriverState
2197 * then we need to make the drive anonymous until the device
2198 * can be removed. If this is a drive with no device backing
2199 * then we can just get rid of the block driver state right here.
2200 */
2201 if (blk_get_attached_dev(blk)) {
2202 blk_hide_on_behalf_of_hmp_drive_del(blk);
2203 /* Further I/O must not pause the guest */
2204 blk_set_on_error(blk, BLOCKDEV_ON_ERROR_REPORT,
2205 BLOCKDEV_ON_ERROR_REPORT);
2206 } else {
2207 blk_unref(blk);
2208 }
2209
2210 aio_context_release(aio_context);
2211 }
2212
2213 void qmp_block_resize(bool has_device, const char *device,
2214 bool has_node_name, const char *node_name,
2215 int64_t size, Error **errp)
2216 {
2217 Error *local_err = NULL;
2218 BlockDriverState *bs;
2219 AioContext *aio_context;
2220 int ret;
2221
2222 bs = bdrv_lookup_bs(has_device ? device : NULL,
2223 has_node_name ? node_name : NULL,
2224 &local_err);
2225 if (local_err) {
2226 error_propagate(errp, local_err);
2227 return;
2228 }
2229
2230 aio_context = bdrv_get_aio_context(bs);
2231 aio_context_acquire(aio_context);
2232
2233 if (!bdrv_is_first_non_filter(bs)) {
2234 error_setg(errp, QERR_FEATURE_DISABLED, "resize");
2235 goto out;
2236 }
2237
2238 if (size < 0) {
2239 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size");
2240 goto out;
2241 }
2242
2243 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_RESIZE, NULL)) {
2244 error_setg(errp, QERR_DEVICE_IN_USE, device);
2245 goto out;
2246 }
2247
2248 /* complete all in-flight operations before resizing the device */
2249 bdrv_drain_all();
2250
2251 ret = bdrv_truncate(bs, size);
2252 switch (ret) {
2253 case 0:
2254 break;
2255 case -ENOMEDIUM:
2256 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
2257 break;
2258 case -ENOTSUP:
2259 error_setg(errp, QERR_UNSUPPORTED);
2260 break;
2261 case -EACCES:
2262 error_setg(errp, "Device '%s' is read only", device);
2263 break;
2264 case -EBUSY:
2265 error_setg(errp, QERR_DEVICE_IN_USE, device);
2266 break;
2267 default:
2268 error_setg_errno(errp, -ret, "Could not resize");
2269 break;
2270 }
2271
2272 out:
2273 aio_context_release(aio_context);
2274 }
2275
2276 static void block_job_cb(void *opaque, int ret)
2277 {
2278 /* Note that this function may be executed from another AioContext besides
2279 * the QEMU main loop. If you need to access anything that assumes the
2280 * QEMU global mutex, use a BH or introduce a mutex.
2281 */
2282
2283 BlockDriverState *bs = opaque;
2284 const char *msg = NULL;
2285
2286 trace_block_job_cb(bs, bs->job, ret);
2287
2288 assert(bs->job);
2289
2290 if (ret < 0) {
2291 msg = strerror(-ret);
2292 }
2293
2294 if (block_job_is_cancelled(bs->job)) {
2295 block_job_event_cancelled(bs->job);
2296 } else {
2297 block_job_event_completed(bs->job, msg);
2298 }
2299
2300 bdrv_put_ref_bh_schedule(bs);
2301 }
2302
2303 void qmp_block_stream(const char *device,
2304 bool has_base, const char *base,
2305 bool has_backing_file, const char *backing_file,
2306 bool has_speed, int64_t speed,
2307 bool has_on_error, BlockdevOnError on_error,
2308 Error **errp)
2309 {
2310 BlockBackend *blk;
2311 BlockDriverState *bs;
2312 BlockDriverState *base_bs = NULL;
2313 AioContext *aio_context;
2314 Error *local_err = NULL;
2315 const char *base_name = NULL;
2316
2317 if (!has_on_error) {
2318 on_error = BLOCKDEV_ON_ERROR_REPORT;
2319 }
2320
2321 blk = blk_by_name(device);
2322 if (!blk) {
2323 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
2324 "Device '%s' not found", device);
2325 return;
2326 }
2327
2328 aio_context = blk_get_aio_context(blk);
2329 aio_context_acquire(aio_context);
2330
2331 if (!blk_is_available(blk)) {
2332 error_setg(errp, "Device '%s' has no medium", device);
2333 goto out;
2334 }
2335 bs = blk_bs(blk);
2336
2337 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_STREAM, errp)) {
2338 goto out;
2339 }
2340
2341 if (has_base) {
2342 base_bs = bdrv_find_backing_image(bs, base);
2343 if (base_bs == NULL) {
2344 error_setg(errp, QERR_BASE_NOT_FOUND, base);
2345 goto out;
2346 }
2347 assert(bdrv_get_aio_context(base_bs) == aio_context);
2348 base_name = base;
2349 }
2350
2351 /* if we are streaming the entire chain, the result will have no backing
2352 * file, and specifying one is therefore an error */
2353 if (base_bs == NULL && has_backing_file) {
2354 error_setg(errp, "backing file specified, but streaming the "
2355 "entire chain");
2356 goto out;
2357 }
2358
2359 /* backing_file string overrides base bs filename */
2360 base_name = has_backing_file ? backing_file : base_name;
2361
2362 stream_start(bs, base_bs, base_name, has_speed ? speed : 0,
2363 on_error, block_job_cb, bs, &local_err);
2364 if (local_err) {
2365 error_propagate(errp, local_err);
2366 goto out;
2367 }
2368
2369 trace_qmp_block_stream(bs, bs->job);
2370
2371 out:
2372 aio_context_release(aio_context);
2373 }
2374
2375 void qmp_block_commit(const char *device,
2376 bool has_base, const char *base,
2377 bool has_top, const char *top,
2378 bool has_backing_file, const char *backing_file,
2379 bool has_speed, int64_t speed,
2380 Error **errp)
2381 {
2382 BlockBackend *blk;
2383 BlockDriverState *bs;
2384 BlockDriverState *base_bs, *top_bs;
2385 AioContext *aio_context;
2386 Error *local_err = NULL;
2387 /* This will be part of the QMP command, if/when the
2388 * BlockdevOnError change for blkmirror makes it in
2389 */
2390 BlockdevOnError on_error = BLOCKDEV_ON_ERROR_REPORT;
2391
2392 if (!has_speed) {
2393 speed = 0;
2394 }
2395
2396 /* Important Note:
2397 * libvirt relies on the DeviceNotFound error class in order to probe for
2398 * live commit feature versions; for this to work, we must make sure to
2399 * perform the device lookup before any generic errors that may occur in a
2400 * scenario in which all optional arguments are omitted. */
2401 blk = blk_by_name(device);
2402 if (!blk) {
2403 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
2404 "Device '%s' not found", device);
2405 return;
2406 }
2407
2408 aio_context = blk_get_aio_context(blk);
2409 aio_context_acquire(aio_context);
2410
2411 if (!blk_is_available(blk)) {
2412 error_setg(errp, "Device '%s' has no medium", device);
2413 goto out;
2414 }
2415 bs = blk_bs(blk);
2416
2417 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_COMMIT_SOURCE, errp)) {
2418 goto out;
2419 }
2420
2421 /* default top_bs is the active layer */
2422 top_bs = bs;
2423
2424 if (has_top && top) {
2425 if (strcmp(bs->filename, top) != 0) {
2426 top_bs = bdrv_find_backing_image(bs, top);
2427 }
2428 }
2429
2430 if (top_bs == NULL) {
2431 error_setg(errp, "Top image file %s not found", top ? top : "NULL");
2432 goto out;
2433 }
2434
2435 assert(bdrv_get_aio_context(top_bs) == aio_context);
2436
2437 if (has_base && base) {
2438 base_bs = bdrv_find_backing_image(top_bs, base);
2439 } else {
2440 base_bs = bdrv_find_base(top_bs);
2441 }
2442
2443 if (base_bs == NULL) {
2444 error_setg(errp, QERR_BASE_NOT_FOUND, base ? base : "NULL");
2445 goto out;
2446 }
2447
2448 assert(bdrv_get_aio_context(base_bs) == aio_context);
2449
2450 if (bdrv_op_is_blocked(base_bs, BLOCK_OP_TYPE_COMMIT_TARGET, errp)) {
2451 goto out;
2452 }
2453
2454 /* Do not allow attempts to commit an image into itself */
2455 if (top_bs == base_bs) {
2456 error_setg(errp, "cannot commit an image into itself");
2457 goto out;
2458 }
2459
2460 if (top_bs == bs) {
2461 if (has_backing_file) {
2462 error_setg(errp, "'backing-file' specified,"
2463 " but 'top' is the active layer");
2464 goto out;
2465 }
2466 commit_active_start(bs, base_bs, speed, on_error, block_job_cb,
2467 bs, &local_err);
2468 } else {
2469 commit_start(bs, base_bs, top_bs, speed, on_error, block_job_cb, bs,
2470 has_backing_file ? backing_file : NULL, &local_err);
2471 }
2472 if (local_err != NULL) {
2473 error_propagate(errp, local_err);
2474 goto out;
2475 }
2476
2477 out:
2478 aio_context_release(aio_context);
2479 }
2480
2481 void qmp_drive_backup(const char *device, const char *target,
2482 bool has_format, const char *format,
2483 enum MirrorSyncMode sync,
2484 bool has_mode, enum NewImageMode mode,
2485 bool has_speed, int64_t speed,
2486 bool has_bitmap, const char *bitmap,
2487 bool has_on_source_error, BlockdevOnError on_source_error,
2488 bool has_on_target_error, BlockdevOnError on_target_error,
2489 Error **errp)
2490 {
2491 BlockBackend *blk;
2492 BlockDriverState *bs;
2493 BlockDriverState *target_bs;
2494 BlockDriverState *source = NULL;
2495 BdrvDirtyBitmap *bmap = NULL;
2496 AioContext *aio_context;
2497 QDict *options = NULL;
2498 Error *local_err = NULL;
2499 int flags;
2500 int64_t size;
2501 int ret;
2502
2503 if (!has_speed) {
2504 speed = 0;
2505 }
2506 if (!has_on_source_error) {
2507 on_source_error = BLOCKDEV_ON_ERROR_REPORT;
2508 }
2509 if (!has_on_target_error) {
2510 on_target_error = BLOCKDEV_ON_ERROR_REPORT;
2511 }
2512 if (!has_mode) {
2513 mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
2514 }
2515
2516 blk = blk_by_name(device);
2517 if (!blk) {
2518 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
2519 "Device '%s' not found", device);
2520 return;
2521 }
2522
2523 aio_context = blk_get_aio_context(blk);
2524 aio_context_acquire(aio_context);
2525
2526 /* Although backup_run has this check too, we need to use bs->drv below, so
2527 * do an early check redundantly. */
2528 if (!blk_is_available(blk)) {
2529 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
2530 goto out;
2531 }
2532 bs = blk_bs(blk);
2533
2534 if (!has_format) {
2535 format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name;
2536 }
2537
2538 /* Early check to avoid creating target */
2539 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_BACKUP_SOURCE, errp)) {
2540 goto out;
2541 }
2542
2543 flags = bs->open_flags | BDRV_O_RDWR;
2544
2545 /* See if we have a backing HD we can use to create our new image
2546 * on top of. */
2547 if (sync == MIRROR_SYNC_MODE_TOP) {
2548 source = backing_bs(bs);
2549 if (!source) {
2550 sync = MIRROR_SYNC_MODE_FULL;
2551 }
2552 }
2553 if (sync == MIRROR_SYNC_MODE_NONE) {
2554 source = bs;
2555 }
2556
2557 size = bdrv_getlength(bs);
2558 if (size < 0) {
2559 error_setg_errno(errp, -size, "bdrv_getlength failed");
2560 goto out;
2561 }
2562
2563 if (mode != NEW_IMAGE_MODE_EXISTING) {
2564 assert(format);
2565 if (source) {
2566 bdrv_img_create(target, format, source->filename,
2567 source->drv->format_name, NULL,
2568 size, flags, &local_err, false);
2569 } else {
2570 bdrv_img_create(target, format, NULL, NULL, NULL,
2571 size, flags, &local_err, false);
2572 }
2573 }
2574
2575 if (local_err) {
2576 error_propagate(errp, local_err);
2577 goto out;
2578 }
2579
2580 if (format) {
2581 options = qdict_new();
2582 qdict_put(options, "driver", qstring_from_str(format));
2583 }
2584
2585 target_bs = NULL;
2586 ret = bdrv_open(&target_bs, target, NULL, options, flags, &local_err);
2587 if (ret < 0) {
2588 error_propagate(errp, local_err);
2589 goto out;
2590 }
2591
2592 bdrv_set_aio_context(target_bs, aio_context);
2593
2594 if (has_bitmap) {
2595 bmap = bdrv_find_dirty_bitmap(bs, bitmap);
2596 if (!bmap) {
2597 error_setg(errp, "Bitmap '%s' could not be found", bitmap);
2598 goto out;
2599 }
2600 }
2601
2602 backup_start(bs, target_bs, speed, sync, bmap,
2603 on_source_error, on_target_error,
2604 block_job_cb, bs, &local_err);
2605 if (local_err != NULL) {
2606 bdrv_unref(target_bs);
2607 error_propagate(errp, local_err);
2608 goto out;
2609 }
2610
2611 out:
2612 aio_context_release(aio_context);
2613 }
2614
2615 BlockDeviceInfoList *qmp_query_named_block_nodes(Error **errp)
2616 {
2617 return bdrv_named_nodes_list(errp);
2618 }
2619
2620 void qmp_blockdev_backup(const char *device, const char *target,
2621 enum MirrorSyncMode sync,
2622 bool has_speed, int64_t speed,
2623 bool has_on_source_error,
2624 BlockdevOnError on_source_error,
2625 bool has_on_target_error,
2626 BlockdevOnError on_target_error,
2627 Error **errp)
2628 {
2629 BlockBackend *blk, *target_blk;
2630 BlockDriverState *bs;
2631 BlockDriverState *target_bs;
2632 Error *local_err = NULL;
2633 AioContext *aio_context;
2634
2635 if (!has_speed) {
2636 speed = 0;
2637 }
2638 if (!has_on_source_error) {
2639 on_source_error = BLOCKDEV_ON_ERROR_REPORT;
2640 }
2641 if (!has_on_target_error) {
2642 on_target_error = BLOCKDEV_ON_ERROR_REPORT;
2643 }
2644
2645 blk = blk_by_name(device);
2646 if (!blk) {
2647 error_setg(errp, "Device '%s' not found", device);
2648 return;
2649 }
2650
2651 aio_context = blk_get_aio_context(blk);
2652 aio_context_acquire(aio_context);
2653
2654 if (!blk_is_available(blk)) {
2655 error_setg(errp, "Device '%s' has no medium", device);
2656 goto out;
2657 }
2658 bs = blk_bs(blk);
2659
2660 target_blk = blk_by_name(target);
2661 if (!target_blk) {
2662 error_setg(errp, "Device '%s' not found", target);
2663 goto out;
2664 }
2665
2666 if (!blk_is_available(target_blk)) {
2667 error_setg(errp, "Device '%s' has no medium", target);
2668 goto out;
2669 }
2670 target_bs = blk_bs(target_blk);
2671
2672 bdrv_ref(target_bs);
2673 bdrv_set_aio_context(target_bs, aio_context);
2674 backup_start(bs, target_bs, speed, sync, NULL, on_source_error,
2675 on_target_error, block_job_cb, bs, &local_err);
2676 if (local_err != NULL) {
2677 bdrv_unref(target_bs);
2678 error_propagate(errp, local_err);
2679 }
2680 out:
2681 aio_context_release(aio_context);
2682 }
2683
2684 void qmp_drive_mirror(const char *device, const char *target,
2685 bool has_format, const char *format,
2686 bool has_node_name, const char *node_name,
2687 bool has_replaces, const char *replaces,
2688 enum MirrorSyncMode sync,
2689 bool has_mode, enum NewImageMode mode,
2690 bool has_speed, int64_t speed,
2691 bool has_granularity, uint32_t granularity,
2692 bool has_buf_size, int64_t buf_size,
2693 bool has_on_source_error, BlockdevOnError on_source_error,
2694 bool has_on_target_error, BlockdevOnError on_target_error,
2695 bool has_unmap, bool unmap,
2696 Error **errp)
2697 {
2698 BlockBackend *blk;
2699 BlockDriverState *bs;
2700 BlockDriverState *source, *target_bs;
2701 AioContext *aio_context;
2702 Error *local_err = NULL;
2703 QDict *options;
2704 int flags;
2705 int64_t size;
2706 int ret;
2707
2708 if (!has_speed) {
2709 speed = 0;
2710 }
2711 if (!has_on_source_error) {
2712 on_source_error = BLOCKDEV_ON_ERROR_REPORT;
2713 }
2714 if (!has_on_target_error) {
2715 on_target_error = BLOCKDEV_ON_ERROR_REPORT;
2716 }
2717 if (!has_mode) {
2718 mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
2719 }
2720 if (!has_granularity) {
2721 granularity = 0;
2722 }
2723 if (!has_buf_size) {
2724 buf_size = 0;
2725 }
2726 if (!has_unmap) {
2727 unmap = true;
2728 }
2729
2730 if (granularity != 0 && (granularity < 512 || granularity > 1048576 * 64)) {
2731 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity",
2732 "a value in range [512B, 64MB]");
2733 return;
2734 }
2735 if (granularity & (granularity - 1)) {
2736 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity",
2737 "power of 2");
2738 return;
2739 }
2740
2741 blk = blk_by_name(device);
2742 if (!blk) {
2743 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
2744 "Device '%s' not found", device);
2745 return;
2746 }
2747
2748 aio_context = blk_get_aio_context(blk);
2749 aio_context_acquire(aio_context);
2750
2751 if (!blk_is_available(blk)) {
2752 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
2753 goto out;
2754 }
2755 bs = blk_bs(blk);
2756
2757 if (!has_format) {
2758 format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name;
2759 }
2760
2761 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_MIRROR, errp)) {
2762 goto out;
2763 }
2764
2765 flags = bs->open_flags | BDRV_O_RDWR;
2766 source = backing_bs(bs);
2767 if (!source && sync == MIRROR_SYNC_MODE_TOP) {
2768 sync = MIRROR_SYNC_MODE_FULL;
2769 }
2770 if (sync == MIRROR_SYNC_MODE_NONE) {
2771 source = bs;
2772 }
2773
2774 size = bdrv_getlength(bs);
2775 if (size < 0) {
2776 error_setg_errno(errp, -size, "bdrv_getlength failed");
2777 goto out;
2778 }
2779
2780 if (has_replaces) {
2781 BlockDriverState *to_replace_bs;
2782 AioContext *replace_aio_context;
2783 int64_t replace_size;
2784
2785 if (!has_node_name) {
2786 error_setg(errp, "a node-name must be provided when replacing a"
2787 " named node of the graph");
2788 goto out;
2789 }
2790
2791 to_replace_bs = check_to_replace_node(bs, replaces, &local_err);
2792
2793 if (!to_replace_bs) {
2794 error_propagate(errp, local_err);
2795 goto out;
2796 }
2797
2798 replace_aio_context = bdrv_get_aio_context(to_replace_bs);
2799 aio_context_acquire(replace_aio_context);
2800 replace_size = bdrv_getlength(to_replace_bs);
2801 aio_context_release(replace_aio_context);
2802
2803 if (size != replace_size) {
2804 error_setg(errp, "cannot replace image with a mirror image of "
2805 "different size");
2806 goto out;
2807 }
2808 }
2809
2810 if ((sync == MIRROR_SYNC_MODE_FULL || !source)
2811 && mode != NEW_IMAGE_MODE_EXISTING)
2812 {
2813 /* create new image w/o backing file */
2814 assert(format);
2815 bdrv_img_create(target, format,
2816 NULL, NULL, NULL, size, flags, &local_err, false);
2817 } else {
2818 switch (mode) {
2819 case NEW_IMAGE_MODE_EXISTING:
2820 break;
2821 case NEW_IMAGE_MODE_ABSOLUTE_PATHS:
2822 /* create new image with backing file */
2823 bdrv_img_create(target, format,
2824 source->filename,
2825 source->drv->format_name,
2826 NULL, size, flags, &local_err, false);
2827 break;
2828 default:
2829 abort();
2830 }
2831 }
2832
2833 if (local_err) {
2834 error_propagate(errp, local_err);
2835 goto out;
2836 }
2837
2838 options = qdict_new();
2839 if (has_node_name) {
2840 qdict_put(options, "node-name", qstring_from_str(node_name));
2841 }
2842 if (format) {
2843 qdict_put(options, "driver", qstring_from_str(format));
2844 }
2845
2846 /* Mirroring takes care of copy-on-write using the source's backing
2847 * file.
2848 */
2849 target_bs = NULL;
2850 ret = bdrv_open(&target_bs, target, NULL, options,
2851 flags | BDRV_O_NO_BACKING, &local_err);
2852 if (ret < 0) {
2853 error_propagate(errp, local_err);
2854 goto out;
2855 }
2856
2857 bdrv_set_aio_context(target_bs, aio_context);
2858
2859 /* pass the node name to replace to mirror start since it's loose coupling
2860 * and will allow to check whether the node still exist at mirror completion
2861 */
2862 mirror_start(bs, target_bs,
2863 has_replaces ? replaces : NULL,
2864 speed, granularity, buf_size, sync,
2865 on_source_error, on_target_error,
2866 unmap,
2867 block_job_cb, bs, &local_err);
2868 if (local_err != NULL) {
2869 bdrv_unref(target_bs);
2870 error_propagate(errp, local_err);
2871 goto out;
2872 }
2873
2874 out:
2875 aio_context_release(aio_context);
2876 }
2877
2878 /* Get the block job for a given device name and acquire its AioContext */
2879 static BlockJob *find_block_job(const char *device, AioContext **aio_context,
2880 Error **errp)
2881 {
2882 BlockBackend *blk;
2883 BlockDriverState *bs;
2884
2885 *aio_context = NULL;
2886
2887 blk = blk_by_name(device);
2888 if (!blk) {
2889 goto notfound;
2890 }
2891
2892 *aio_context = blk_get_aio_context(blk);
2893 aio_context_acquire(*aio_context);
2894
2895 if (!blk_is_available(blk)) {
2896 goto notfound;
2897 }
2898 bs = blk_bs(blk);
2899
2900 if (!bs->job) {
2901 goto notfound;
2902 }
2903
2904 return bs->job;
2905
2906 notfound:
2907 error_set(errp, ERROR_CLASS_DEVICE_NOT_ACTIVE,
2908 "No active block job on device '%s'", device);
2909 if (*aio_context) {
2910 aio_context_release(*aio_context);
2911 *aio_context = NULL;
2912 }
2913 return NULL;
2914 }
2915
2916 void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp)
2917 {
2918 AioContext *aio_context;
2919 BlockJob *job = find_block_job(device, &aio_context, errp);
2920
2921 if (!job) {
2922 return;
2923 }
2924
2925 block_job_set_speed(job, speed, errp);
2926 aio_context_release(aio_context);
2927 }
2928
2929 void qmp_block_job_cancel(const char *device,
2930 bool has_force, bool force, Error **errp)
2931 {
2932 AioContext *aio_context;
2933 BlockJob *job = find_block_job(device, &aio_context, errp);
2934
2935 if (!job) {
2936 return;
2937 }
2938
2939 if (!has_force) {
2940 force = false;
2941 }
2942
2943 if (job->user_paused && !force) {
2944 error_setg(errp, "The block job for device '%s' is currently paused",
2945 device);
2946 goto out;
2947 }
2948
2949 trace_qmp_block_job_cancel(job);
2950 block_job_cancel(job);
2951 out:
2952 aio_context_release(aio_context);
2953 }
2954
2955 void qmp_block_job_pause(const char *device, Error **errp)
2956 {
2957 AioContext *aio_context;
2958 BlockJob *job = find_block_job(device, &aio_context, errp);
2959
2960 if (!job || job->user_paused) {
2961 return;
2962 }
2963
2964 job->user_paused = true;
2965 trace_qmp_block_job_pause(job);
2966 block_job_pause(job);
2967 aio_context_release(aio_context);
2968 }
2969
2970 void qmp_block_job_resume(const char *device, Error **errp)
2971 {
2972 AioContext *aio_context;
2973 BlockJob *job = find_block_job(device, &aio_context, errp);
2974
2975 if (!job || !job->user_paused) {
2976 return;
2977 }
2978
2979 job->user_paused = false;
2980 trace_qmp_block_job_resume(job);
2981 block_job_resume(job);
2982 aio_context_release(aio_context);
2983 }
2984
2985 void qmp_block_job_complete(const char *device, Error **errp)
2986 {
2987 AioContext *aio_context;
2988 BlockJob *job = find_block_job(device, &aio_context, errp);
2989
2990 if (!job) {
2991 return;
2992 }
2993
2994 trace_qmp_block_job_complete(job);
2995 block_job_complete(job, errp);
2996 aio_context_release(aio_context);
2997 }
2998
2999 void qmp_change_backing_file(const char *device,
3000 const char *image_node_name,
3001 const char *backing_file,
3002 Error **errp)
3003 {
3004 BlockBackend *blk;
3005 BlockDriverState *bs = NULL;
3006 AioContext *aio_context;
3007 BlockDriverState *image_bs = NULL;
3008 Error *local_err = NULL;
3009 bool ro;
3010 int open_flags;
3011 int ret;
3012
3013 blk = blk_by_name(device);
3014 if (!blk) {
3015 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
3016 "Device '%s' not found", device);
3017 return;
3018 }
3019
3020 aio_context = blk_get_aio_context(blk);
3021 aio_context_acquire(aio_context);
3022
3023 if (!blk_is_available(blk)) {
3024 error_setg(errp, "Device '%s' has no medium", device);
3025 goto out;
3026 }
3027 bs = blk_bs(blk);
3028
3029 image_bs = bdrv_lookup_bs(NULL, image_node_name, &local_err);
3030 if (local_err) {
3031 error_propagate(errp, local_err);
3032 goto out;
3033 }
3034
3035 if (!image_bs) {
3036 error_setg(errp, "image file not found");
3037 goto out;
3038 }
3039
3040 if (bdrv_find_base(image_bs) == image_bs) {
3041 error_setg(errp, "not allowing backing file change on an image "
3042 "without a backing file");
3043 goto out;
3044 }
3045
3046 /* even though we are not necessarily operating on bs, we need it to
3047 * determine if block ops are currently prohibited on the chain */
3048 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_CHANGE, errp)) {
3049 goto out;
3050 }
3051
3052 /* final sanity check */
3053 if (!bdrv_chain_contains(bs, image_bs)) {
3054 error_setg(errp, "'%s' and image file are not in the same chain",
3055 device);
3056 goto out;
3057 }
3058
3059 /* if not r/w, reopen to make r/w */
3060 open_flags = image_bs->open_flags;
3061 ro = bdrv_is_read_only(image_bs);
3062
3063 if (ro) {
3064 bdrv_reopen(image_bs, open_flags | BDRV_O_RDWR, &local_err);
3065 if (local_err) {
3066 error_propagate(errp, local_err);
3067 goto out;
3068 }
3069 }
3070
3071 ret = bdrv_change_backing_file(image_bs, backing_file,
3072 image_bs->drv ? image_bs->drv->format_name : "");
3073
3074 if (ret < 0) {
3075 error_setg_errno(errp, -ret, "Could not change backing file to '%s'",
3076 backing_file);
3077 /* don't exit here, so we can try to restore open flags if
3078 * appropriate */
3079 }
3080
3081 if (ro) {
3082 bdrv_reopen(image_bs, open_flags, &local_err);
3083 if (local_err) {
3084 error_propagate(errp, local_err); /* will preserve prior errp */
3085 }
3086 }
3087
3088 out:
3089 aio_context_release(aio_context);
3090 }
3091
3092 void qmp_blockdev_add(BlockdevOptions *options, Error **errp)
3093 {
3094 QmpOutputVisitor *ov = qmp_output_visitor_new();
3095 BlockDriverState *bs;
3096 BlockBackend *blk = NULL;
3097 QObject *obj;
3098 QDict *qdict;
3099 Error *local_err = NULL;
3100
3101 /* TODO Sort it out in raw-posix and drive_new(): Reject aio=native with
3102 * cache.direct=false instead of silently switching to aio=threads, except
3103 * when called from drive_new().
3104 *
3105 * For now, simply forbidding the combination for all drivers will do. */
3106 if (options->has_aio && options->aio == BLOCKDEV_AIO_OPTIONS_NATIVE) {
3107 bool direct = options->has_cache &&
3108 options->cache->has_direct &&
3109 options->cache->direct;
3110 if (!direct) {
3111 error_setg(errp, "aio=native requires cache.direct=true");
3112 goto fail;
3113 }
3114 }
3115
3116 visit_type_BlockdevOptions(qmp_output_get_visitor(ov),
3117 &options, NULL, &local_err);
3118 if (local_err) {
3119 error_propagate(errp, local_err);
3120 goto fail;
3121 }
3122
3123 obj = qmp_output_get_qobject(ov);
3124 qdict = qobject_to_qdict(obj);
3125
3126 qdict_flatten(qdict);
3127
3128 if (options->has_id) {
3129 blk = blockdev_init(NULL, qdict, &local_err);
3130 if (local_err) {
3131 error_propagate(errp, local_err);
3132 goto fail;
3133 }
3134
3135 bs = blk_bs(blk);
3136 } else {
3137 int ret;
3138
3139 if (!qdict_get_try_str(qdict, "node-name")) {
3140 error_setg(errp, "'id' and/or 'node-name' need to be specified for "
3141 "the root node");
3142 goto fail;
3143 }
3144
3145 bs = NULL;
3146 ret = bdrv_open(&bs, NULL, NULL, qdict, BDRV_O_RDWR | BDRV_O_CACHE_WB,
3147 errp);
3148 if (ret < 0) {
3149 goto fail;
3150 }
3151 }
3152
3153 if (bs && bdrv_key_required(bs)) {
3154 if (blk) {
3155 blk_unref(blk);
3156 } else {
3157 bdrv_unref(bs);
3158 }
3159 error_setg(errp, "blockdev-add doesn't support encrypted devices");
3160 goto fail;
3161 }
3162
3163 fail:
3164 qmp_output_visitor_cleanup(ov);
3165 }
3166
3167 BlockJobInfoList *qmp_query_block_jobs(Error **errp)
3168 {
3169 BlockJobInfoList *head = NULL, **p_next = &head;
3170 BlockDriverState *bs;
3171
3172 for (bs = bdrv_next(NULL); bs; bs = bdrv_next(bs)) {
3173 AioContext *aio_context = bdrv_get_aio_context(bs);
3174
3175 aio_context_acquire(aio_context);
3176
3177 if (bs->job) {
3178 BlockJobInfoList *elem = g_new0(BlockJobInfoList, 1);
3179 elem->value = block_job_query(bs->job);
3180 *p_next = elem;
3181 p_next = &elem->next;
3182 }
3183
3184 aio_context_release(aio_context);
3185 }
3186
3187 return head;
3188 }
3189
3190 QemuOptsList qemu_common_drive_opts = {
3191 .name = "drive",
3192 .head = QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts.head),
3193 .desc = {
3194 {
3195 .name = "snapshot",
3196 .type = QEMU_OPT_BOOL,
3197 .help = "enable/disable snapshot mode",
3198 },{
3199 .name = "discard",
3200 .type = QEMU_OPT_STRING,
3201 .help = "discard operation (ignore/off, unmap/on)",
3202 },{
3203 .name = BDRV_OPT_CACHE_WB,
3204 .type = QEMU_OPT_BOOL,
3205 .help = "enables writeback mode for any caches",
3206 },{
3207 .name = BDRV_OPT_CACHE_DIRECT,
3208 .type = QEMU_OPT_BOOL,
3209 .help = "enables use of O_DIRECT (bypass the host page cache)",
3210 },{
3211 .name = BDRV_OPT_CACHE_NO_FLUSH,
3212 .type = QEMU_OPT_BOOL,
3213 .help = "ignore any flush requests for the device",
3214 },{
3215 .name = "aio",
3216 .type = QEMU_OPT_STRING,
3217 .help = "host AIO implementation (threads, native)",
3218 },{
3219 .name = "format",
3220 .type = QEMU_OPT_STRING,
3221 .help = "disk format (raw, qcow2, ...)",
3222 },{
3223 .name = "rerror",
3224 .type = QEMU_OPT_STRING,
3225 .help = "read error action",
3226 },{
3227 .name = "werror",
3228 .type = QEMU_OPT_STRING,
3229 .help = "write error action",
3230 },{
3231 .name = "read-only",
3232 .type = QEMU_OPT_BOOL,
3233 .help = "open drive file as read-only",
3234 },{
3235 .name = "throttling.iops-total",
3236 .type = QEMU_OPT_NUMBER,
3237 .help = "limit total I/O operations per second",
3238 },{
3239 .name = "throttling.iops-read",
3240 .type = QEMU_OPT_NUMBER,
3241 .help = "limit read operations per second",
3242 },{
3243 .name = "throttling.iops-write",
3244 .type = QEMU_OPT_NUMBER,
3245 .help = "limit write operations per second",
3246 },{
3247 .name = "throttling.bps-total",
3248 .type = QEMU_OPT_NUMBER,
3249 .help = "limit total bytes per second",
3250 },{
3251 .name = "throttling.bps-read",
3252 .type = QEMU_OPT_NUMBER,
3253 .help = "limit read bytes per second",
3254 },{
3255 .name = "throttling.bps-write",
3256 .type = QEMU_OPT_NUMBER,
3257 .help = "limit write bytes per second",
3258 },{
3259 .name = "throttling.iops-total-max",
3260 .type = QEMU_OPT_NUMBER,
3261 .help = "I/O operations burst",
3262 },{
3263 .name = "throttling.iops-read-max",
3264 .type = QEMU_OPT_NUMBER,
3265 .help = "I/O operations read burst",
3266 },{
3267 .name = "throttling.iops-write-max",
3268 .type = QEMU_OPT_NUMBER,
3269 .help = "I/O operations write burst",
3270 },{
3271 .name = "throttling.bps-total-max",
3272 .type = QEMU_OPT_NUMBER,
3273 .help = "total bytes burst",
3274 },{
3275 .name = "throttling.bps-read-max",
3276 .type = QEMU_OPT_NUMBER,
3277 .help = "total bytes read burst",
3278 },{
3279 .name = "throttling.bps-write-max",
3280 .type = QEMU_OPT_NUMBER,
3281 .help = "total bytes write burst",
3282 },{
3283 .name = "throttling.iops-size",
3284 .type = QEMU_OPT_NUMBER,
3285 .help = "when limiting by iops max size of an I/O in bytes",
3286 },{
3287 .name = "throttling.group",
3288 .type = QEMU_OPT_STRING,
3289 .help = "name of the block throttling group",
3290 },{
3291 .name = "copy-on-read",
3292 .type = QEMU_OPT_BOOL,
3293 .help = "copy read data from backing file into image file",
3294 },{
3295 .name = "detect-zeroes",
3296 .type = QEMU_OPT_STRING,
3297 .help = "try to optimize zero writes (off, on, unmap)",
3298 },
3299 { /* end of list */ }
3300 },
3301 };
3302
3303 QemuOptsList qemu_drive_opts = {
3304 .name = "drive",
3305 .head = QTAILQ_HEAD_INITIALIZER(qemu_drive_opts.head),
3306 .desc = {
3307 /*
3308 * no elements => accept any params
3309 * validation will happen later
3310 */
3311 { /* end of list */ }
3312 },
3313 };
QEmu