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qerror: Finally unused, clean up
[qemu/ar7.git] / blockdev.c
blob80dabc3d123a435ec771ff42aa13c318f617e26b
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/option.h"
40 #include "qemu/config-file.h"
41 #include "qapi/qmp/types.h"
42 #include "qapi-visit.h"
43 #include "qapi/qmp-output-visitor.h"
44 #include "qapi/util.h"
45 #include "sysemu/sysemu.h"
46 #include "block/block_int.h"
47 #include "qmp-commands.h"
48 #include "trace.h"
49 #include "sysemu/arch_init.h"
50
51 static const char *const if_name[IF_COUNT] = {
52 [IF_NONE] = "none",
53 [IF_IDE] = "ide",
54 [IF_SCSI] = "scsi",
55 [IF_FLOPPY] = "floppy",
56 [IF_PFLASH] = "pflash",
57 [IF_MTD] = "mtd",
58 [IF_SD] = "sd",
59 [IF_VIRTIO] = "virtio",
60 [IF_XEN] = "xen",
61 };
62
63 static int if_max_devs[IF_COUNT] = {
64 /*
65 * Do not change these numbers! They govern how drive option
66 * index maps to unit and bus. That mapping is ABI.
67 *
68 * All controllers used to imlement if=T drives need to support
69 * if_max_devs[T] units, for any T with if_max_devs[T] != 0.
70 * Otherwise, some index values map to "impossible" bus, unit
71 * values.
72 *
73 * For instance, if you change [IF_SCSI] to 255, -drive
74 * if=scsi,index=12 no longer means bus=1,unit=5, but
75 * bus=0,unit=12. With an lsi53c895a controller (7 units max),
76 * the drive can't be set up. Regression.
77 */
78 [IF_IDE] = 2,
79 [IF_SCSI] = 7,
80 };
81
82 /**
83 * Boards may call this to offer board-by-board overrides
84 * of the default, global values.
85 */
86 void override_max_devs(BlockInterfaceType type, int max_devs)
87 {
88 BlockBackend *blk;
89 DriveInfo *dinfo;
90
91 if (max_devs <= 0) {
92 return;
93 }
94
95 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
96 dinfo = blk_legacy_dinfo(blk);
97 if (dinfo->type == type) {
98 fprintf(stderr, "Cannot override units-per-bus property of"
99 " the %s interface, because a drive of that type has"
100 " already been added.\n", if_name[type]);
101 g_assert_not_reached();
102 }
103 }
104
105 if_max_devs[type] = max_devs;
106 }
107
108 /*
109 * We automatically delete the drive when a device using it gets
110 * unplugged. Questionable feature, but we can't just drop it.
111 * Device models call blockdev_mark_auto_del() to schedule the
112 * automatic deletion, and generic qdev code calls blockdev_auto_del()
113 * when deletion is actually safe.
114 */
115 void blockdev_mark_auto_del(BlockBackend *blk)
116 {
117 DriveInfo *dinfo = blk_legacy_dinfo(blk);
118 BlockDriverState *bs = blk_bs(blk);
119 AioContext *aio_context;
120
121 if (!dinfo) {
122 return;
123 }
124
125 aio_context = bdrv_get_aio_context(bs);
126 aio_context_acquire(aio_context);
127
128 if (bs->job) {
129 block_job_cancel(bs->job);
130 }
131
132 aio_context_release(aio_context);
133
134 dinfo->auto_del = 1;
135 }
136
137 void blockdev_auto_del(BlockBackend *blk)
138 {
139 DriveInfo *dinfo = blk_legacy_dinfo(blk);
140
141 if (dinfo && dinfo->auto_del) {
142 blk_unref(blk);
143 }
144 }
145
146 /**
147 * Returns the current mapping of how many units per bus
148 * a particular interface can support.
149 *
150 * A positive integer indicates n units per bus.
151 * 0 implies the mapping has not been established.
152 * -1 indicates an invalid BlockInterfaceType was given.
153 */
154 int drive_get_max_devs(BlockInterfaceType type)
155 {
156 if (type >= IF_IDE && type < IF_COUNT) {
157 return if_max_devs[type];
158 }
159
160 return -1;
161 }
162
163 static int drive_index_to_bus_id(BlockInterfaceType type, int index)
164 {
165 int max_devs = if_max_devs[type];
166 return max_devs ? index / max_devs : 0;
167 }
168
169 static int drive_index_to_unit_id(BlockInterfaceType type, int index)
170 {
171 int max_devs = if_max_devs[type];
172 return max_devs ? index % max_devs : index;
173 }
174
175 QemuOpts *drive_def(const char *optstr)
176 {
177 return qemu_opts_parse_noisily(qemu_find_opts("drive"), optstr, false);
178 }
179
180 QemuOpts *drive_add(BlockInterfaceType type, int index, const char *file,
181 const char *optstr)
182 {
183 QemuOpts *opts;
184
185 opts = drive_def(optstr);
186 if (!opts) {
187 return NULL;
188 }
189 if (type != IF_DEFAULT) {
190 qemu_opt_set(opts, "if", if_name[type], &error_abort);
191 }
192 if (index >= 0) {
193 qemu_opt_set_number(opts, "index", index, &error_abort);
194 }
195 if (file)
196 qemu_opt_set(opts, "file", file, &error_abort);
197 return opts;
198 }
199
200 DriveInfo *drive_get(BlockInterfaceType type, int bus, int unit)
201 {
202 BlockBackend *blk;
203 DriveInfo *dinfo;
204
205 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
206 dinfo = blk_legacy_dinfo(blk);
207 if (dinfo && dinfo->type == type
208 && dinfo->bus == bus && dinfo->unit == unit) {
209 return dinfo;
210 }
211 }
212
213 return NULL;
214 }
215
216 bool drive_check_orphaned(void)
217 {
218 BlockBackend *blk;
219 DriveInfo *dinfo;
220 bool rs = false;
221
222 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
223 dinfo = blk_legacy_dinfo(blk);
224 /* If dinfo->bdrv->dev is NULL, it has no device attached. */
225 /* Unless this is a default drive, this may be an oversight. */
226 if (!blk_get_attached_dev(blk) && !dinfo->is_default &&
227 dinfo->type != IF_NONE) {
228 fprintf(stderr, "Warning: Orphaned drive without device: "
229 "id=%s,file=%s,if=%s,bus=%d,unit=%d\n",
230 blk_name(blk), blk_bs(blk)->filename, if_name[dinfo->type],
231 dinfo->bus, dinfo->unit);
232 rs = true;
233 }
234 }
235
236 return rs;
237 }
238
239 DriveInfo *drive_get_by_index(BlockInterfaceType type, int index)
240 {
241 return drive_get(type,
242 drive_index_to_bus_id(type, index),
243 drive_index_to_unit_id(type, index));
244 }
245
246 int drive_get_max_bus(BlockInterfaceType type)
247 {
248 int max_bus;
249 BlockBackend *blk;
250 DriveInfo *dinfo;
251
252 max_bus = -1;
253 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
254 dinfo = blk_legacy_dinfo(blk);
255 if (dinfo && dinfo->type == type && dinfo->bus > max_bus) {
256 max_bus = dinfo->bus;
257 }
258 }
259 return max_bus;
260 }
261
262 /* Get a block device. This should only be used for single-drive devices
263 (e.g. SD/Floppy/MTD). Multi-disk devices (scsi/ide) should use the
264 appropriate bus. */
265 DriveInfo *drive_get_next(BlockInterfaceType type)
266 {
267 static int next_block_unit[IF_COUNT];
268
269 return drive_get(type, 0, next_block_unit[type]++);
270 }
271
272 static void bdrv_format_print(void *opaque, const char *name)
273 {
274 error_printf(" %s", name);
275 }
276
277 typedef struct {
278 QEMUBH *bh;
279 BlockDriverState *bs;
280 } BDRVPutRefBH;
281
282 static void bdrv_put_ref_bh(void *opaque)
283 {
284 BDRVPutRefBH *s = opaque;
285
286 bdrv_unref(s->bs);
287 qemu_bh_delete(s->bh);
288 g_free(s);
289 }
290
291 /*
292 * Release a BDS reference in a BH
293 *
294 * It is not safe to use bdrv_unref() from a callback function when the callers
295 * still need the BlockDriverState. In such cases we schedule a BH to release
296 * the reference.
297 */
298 static void bdrv_put_ref_bh_schedule(BlockDriverState *bs)
299 {
300 BDRVPutRefBH *s;
301
302 s = g_new(BDRVPutRefBH, 1);
303 s->bh = qemu_bh_new(bdrv_put_ref_bh, s);
304 s->bs = bs;
305 qemu_bh_schedule(s->bh);
306 }
307
308 static int parse_block_error_action(const char *buf, bool is_read, Error **errp)
309 {
310 if (!strcmp(buf, "ignore")) {
311 return BLOCKDEV_ON_ERROR_IGNORE;
312 } else if (!is_read && !strcmp(buf, "enospc")) {
313 return BLOCKDEV_ON_ERROR_ENOSPC;
314 } else if (!strcmp(buf, "stop")) {
315 return BLOCKDEV_ON_ERROR_STOP;
316 } else if (!strcmp(buf, "report")) {
317 return BLOCKDEV_ON_ERROR_REPORT;
318 } else {
319 error_setg(errp, "'%s' invalid %s error action",
320 buf, is_read ? "read" : "write");
321 return -1;
322 }
323 }
324
325 static bool check_throttle_config(ThrottleConfig *cfg, Error **errp)
326 {
327 if (throttle_conflicting(cfg)) {
328 error_setg(errp, "bps/iops/max total values and read/write values"
329 " cannot be used at the same time");
330 return false;
331 }
332
333 if (!throttle_is_valid(cfg)) {
334 error_setg(errp, "bps/iops/maxs values must be 0 or greater");
335 return false;
336 }
337
338 return true;
339 }
340
341 typedef enum { MEDIA_DISK, MEDIA_CDROM } DriveMediaType;
342
343 /* Takes the ownership of bs_opts */
344 static BlockBackend *blockdev_init(const char *file, QDict *bs_opts,
345 Error **errp)
346 {
347 const char *buf;
348 int ro = 0;
349 int bdrv_flags = 0;
350 int on_read_error, on_write_error;
351 BlockBackend *blk;
352 BlockDriverState *bs;
353 ThrottleConfig cfg;
354 int snapshot = 0;
355 bool copy_on_read;
356 Error *error = NULL;
357 QemuOpts *opts;
358 const char *id;
359 bool has_driver_specific_opts;
360 BlockdevDetectZeroesOptions detect_zeroes;
361 const char *throttling_group;
362
363 /* Check common options by copying from bs_opts to opts, all other options
364 * stay in bs_opts for processing by bdrv_open(). */
365 id = qdict_get_try_str(bs_opts, "id");
366 opts = qemu_opts_create(&qemu_common_drive_opts, id, 1, &error);
367 if (error) {
368 error_propagate(errp, error);
369 goto err_no_opts;
370 }
371
372 qemu_opts_absorb_qdict(opts, bs_opts, &error);
373 if (error) {
374 error_propagate(errp, error);
375 goto early_err;
376 }
377
378 if (id) {
379 qdict_del(bs_opts, "id");
380 }
381
382 has_driver_specific_opts = !!qdict_size(bs_opts);
383
384 /* extract parameters */
385 snapshot = qemu_opt_get_bool(opts, "snapshot", 0);
386 ro = qemu_opt_get_bool(opts, "read-only", 0);
387 copy_on_read = qemu_opt_get_bool(opts, "copy-on-read", false);
388
389 if ((buf = qemu_opt_get(opts, "discard")) != NULL) {
390 if (bdrv_parse_discard_flags(buf, &bdrv_flags) != 0) {
391 error_setg(errp, "invalid discard option");
392 goto early_err;
393 }
394 }
395
396 if (qemu_opt_get_bool(opts, BDRV_OPT_CACHE_WB, true)) {
397 bdrv_flags |= BDRV_O_CACHE_WB;
398 }
399 if (qemu_opt_get_bool(opts, BDRV_OPT_CACHE_DIRECT, false)) {
400 bdrv_flags |= BDRV_O_NOCACHE;
401 }
402 if (qemu_opt_get_bool(opts, BDRV_OPT_CACHE_NO_FLUSH, false)) {
403 bdrv_flags |= BDRV_O_NO_FLUSH;
404 }
405
406 #ifdef CONFIG_LINUX_AIO
407 if ((buf = qemu_opt_get(opts, "aio")) != NULL) {
408 if (!strcmp(buf, "native")) {
409 bdrv_flags |= BDRV_O_NATIVE_AIO;
410 } else if (!strcmp(buf, "threads")) {
411 /* this is the default */
412 } else {
413 error_setg(errp, "invalid aio option");
414 goto early_err;
415 }
416 }
417 #endif
418
419 if ((buf = qemu_opt_get(opts, "format")) != NULL) {
420 if (is_help_option(buf)) {
421 error_printf("Supported formats:");
422 bdrv_iterate_format(bdrv_format_print, NULL);
423 error_printf("\n");
424 goto early_err;
425 }
426
427 if (qdict_haskey(bs_opts, "driver")) {
428 error_setg(errp, "Cannot specify both 'driver' and 'format'");
429 goto early_err;
430 }
431 qdict_put(bs_opts, "driver", qstring_from_str(buf));
432 }
433
434 /* disk I/O throttling */
435 memset(&cfg, 0, sizeof(cfg));
436 cfg.buckets[THROTTLE_BPS_TOTAL].avg =
437 qemu_opt_get_number(opts, "throttling.bps-total", 0);
438 cfg.buckets[THROTTLE_BPS_READ].avg =
439 qemu_opt_get_number(opts, "throttling.bps-read", 0);
440 cfg.buckets[THROTTLE_BPS_WRITE].avg =
441 qemu_opt_get_number(opts, "throttling.bps-write", 0);
442 cfg.buckets[THROTTLE_OPS_TOTAL].avg =
443 qemu_opt_get_number(opts, "throttling.iops-total", 0);
444 cfg.buckets[THROTTLE_OPS_READ].avg =
445 qemu_opt_get_number(opts, "throttling.iops-read", 0);
446 cfg.buckets[THROTTLE_OPS_WRITE].avg =
447 qemu_opt_get_number(opts, "throttling.iops-write", 0);
448
449 cfg.buckets[THROTTLE_BPS_TOTAL].max =
450 qemu_opt_get_number(opts, "throttling.bps-total-max", 0);
451 cfg.buckets[THROTTLE_BPS_READ].max =
452 qemu_opt_get_number(opts, "throttling.bps-read-max", 0);
453 cfg.buckets[THROTTLE_BPS_WRITE].max =
454 qemu_opt_get_number(opts, "throttling.bps-write-max", 0);
455 cfg.buckets[THROTTLE_OPS_TOTAL].max =
456 qemu_opt_get_number(opts, "throttling.iops-total-max", 0);
457 cfg.buckets[THROTTLE_OPS_READ].max =
458 qemu_opt_get_number(opts, "throttling.iops-read-max", 0);
459 cfg.buckets[THROTTLE_OPS_WRITE].max =
460 qemu_opt_get_number(opts, "throttling.iops-write-max", 0);
461
462 cfg.op_size = qemu_opt_get_number(opts, "throttling.iops-size", 0);
463
464 throttling_group = qemu_opt_get(opts, "throttling.group");
465
466 if (!check_throttle_config(&cfg, &error)) {
467 error_propagate(errp, error);
468 goto early_err;
469 }
470
471 on_write_error = BLOCKDEV_ON_ERROR_ENOSPC;
472 if ((buf = qemu_opt_get(opts, "werror")) != NULL) {
473 on_write_error = parse_block_error_action(buf, 0, &error);
474 if (error) {
475 error_propagate(errp, error);
476 goto early_err;
477 }
478 }
479
480 on_read_error = BLOCKDEV_ON_ERROR_REPORT;
481 if ((buf = qemu_opt_get(opts, "rerror")) != NULL) {
482 on_read_error = parse_block_error_action(buf, 1, &error);
483 if (error) {
484 error_propagate(errp, error);
485 goto early_err;
486 }
487 }
488
489 detect_zeroes =
490 qapi_enum_parse(BlockdevDetectZeroesOptions_lookup,
491 qemu_opt_get(opts, "detect-zeroes"),
492 BLOCKDEV_DETECT_ZEROES_OPTIONS_MAX,
493 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF,
494 &error);
495 if (error) {
496 error_propagate(errp, error);
497 goto early_err;
498 }
499
500 if (detect_zeroes == BLOCKDEV_DETECT_ZEROES_OPTIONS_UNMAP &&
501 !(bdrv_flags & BDRV_O_UNMAP)) {
502 error_setg(errp, "setting detect-zeroes to unmap is not allowed "
503 "without setting discard operation to unmap");
504 goto early_err;
505 }
506
507 /* init */
508 if ((!file || !*file) && !has_driver_specific_opts) {
509 blk = blk_new_with_bs(qemu_opts_id(opts), errp);
510 if (!blk) {
511 goto early_err;
512 }
513
514 bs = blk_bs(blk);
515 bs->open_flags = snapshot ? BDRV_O_SNAPSHOT : 0;
516 bs->read_only = ro;
517
518 QDECREF(bs_opts);
519 } else {
520 if (file && !*file) {
521 file = NULL;
522 }
523
524 if (snapshot) {
525 /* always use cache=unsafe with snapshot */
526 bdrv_flags &= ~BDRV_O_CACHE_MASK;
527 bdrv_flags |= (BDRV_O_SNAPSHOT|BDRV_O_CACHE_WB|BDRV_O_NO_FLUSH);
528 }
529
530 if (copy_on_read) {
531 bdrv_flags |= BDRV_O_COPY_ON_READ;
532 }
533
534 if (runstate_check(RUN_STATE_INMIGRATE)) {
535 bdrv_flags |= BDRV_O_INCOMING;
536 }
537
538 bdrv_flags |= ro ? 0 : BDRV_O_RDWR;
539
540 blk = blk_new_open(qemu_opts_id(opts), file, NULL, bs_opts, bdrv_flags,
541 errp);
542 if (!blk) {
543 goto err_no_bs_opts;
544 }
545 bs = blk_bs(blk);
546 }
547
548 bs->detect_zeroes = detect_zeroes;
549
550 bdrv_set_on_error(bs, on_read_error, on_write_error);
551
552 /* disk I/O throttling */
553 if (throttle_enabled(&cfg)) {
554 if (!throttling_group) {
555 throttling_group = blk_name(blk);
556 }
557 bdrv_io_limits_enable(bs, throttling_group);
558 bdrv_set_io_limits(bs, &cfg);
559 }
560
561 if (bdrv_key_required(bs)) {
562 autostart = 0;
563 }
564
565 err_no_bs_opts:
566 qemu_opts_del(opts);
567 return blk;
568
569 early_err:
570 qemu_opts_del(opts);
571 err_no_opts:
572 QDECREF(bs_opts);
573 return NULL;
574 }
575
576 static void qemu_opt_rename(QemuOpts *opts, const char *from, const char *to,
577 Error **errp)
578 {
579 const char *value;
580
581 value = qemu_opt_get(opts, from);
582 if (value) {
583 if (qemu_opt_find(opts, to)) {
584 error_setg(errp, "'%s' and its alias '%s' can't be used at the "
585 "same time", to, from);
586 return;
587 }
588 }
589
590 /* rename all items in opts */
591 while ((value = qemu_opt_get(opts, from))) {
592 qemu_opt_set(opts, to, value, &error_abort);
593 qemu_opt_unset(opts, from);
594 }
595 }
596
597 QemuOptsList qemu_legacy_drive_opts = {
598 .name = "drive",
599 .head = QTAILQ_HEAD_INITIALIZER(qemu_legacy_drive_opts.head),
600 .desc = {
601 {
602 .name = "bus",
603 .type = QEMU_OPT_NUMBER,
604 .help = "bus number",
605 },{
606 .name = "unit",
607 .type = QEMU_OPT_NUMBER,
608 .help = "unit number (i.e. lun for scsi)",
609 },{
610 .name = "index",
611 .type = QEMU_OPT_NUMBER,
612 .help = "index number",
613 },{
614 .name = "media",
615 .type = QEMU_OPT_STRING,
616 .help = "media type (disk, cdrom)",
617 },{
618 .name = "if",
619 .type = QEMU_OPT_STRING,
620 .help = "interface (ide, scsi, sd, mtd, floppy, pflash, virtio)",
621 },{
622 .name = "cyls",
623 .type = QEMU_OPT_NUMBER,
624 .help = "number of cylinders (ide disk geometry)",
625 },{
626 .name = "heads",
627 .type = QEMU_OPT_NUMBER,
628 .help = "number of heads (ide disk geometry)",
629 },{
630 .name = "secs",
631 .type = QEMU_OPT_NUMBER,
632 .help = "number of sectors (ide disk geometry)",
633 },{
634 .name = "trans",
635 .type = QEMU_OPT_STRING,
636 .help = "chs translation (auto, lba, none)",
637 },{
638 .name = "boot",
639 .type = QEMU_OPT_BOOL,
640 .help = "(deprecated, ignored)",
641 },{
642 .name = "addr",
643 .type = QEMU_OPT_STRING,
644 .help = "pci address (virtio only)",
645 },{
646 .name = "serial",
647 .type = QEMU_OPT_STRING,
648 .help = "disk serial number",
649 },{
650 .name = "file",
651 .type = QEMU_OPT_STRING,
652 .help = "file name",
653 },
654
655 /* Options that are passed on, but have special semantics with -drive */
656 {
657 .name = "read-only",
658 .type = QEMU_OPT_BOOL,
659 .help = "open drive file as read-only",
660 },{
661 .name = "rerror",
662 .type = QEMU_OPT_STRING,
663 .help = "read error action",
664 },{
665 .name = "werror",
666 .type = QEMU_OPT_STRING,
667 .help = "write error action",
668 },{
669 .name = "copy-on-read",
670 .type = QEMU_OPT_BOOL,
671 .help = "copy read data from backing file into image file",
672 },
673
674 { /* end of list */ }
675 },
676 };
677
678 DriveInfo *drive_new(QemuOpts *all_opts, BlockInterfaceType block_default_type)
679 {
680 const char *value;
681 BlockBackend *blk;
682 DriveInfo *dinfo = NULL;
683 QDict *bs_opts;
684 QemuOpts *legacy_opts;
685 DriveMediaType media = MEDIA_DISK;
686 BlockInterfaceType type;
687 int cyls, heads, secs, translation;
688 int max_devs, bus_id, unit_id, index;
689 const char *devaddr;
690 const char *werror, *rerror;
691 bool read_only = false;
692 bool copy_on_read;
693 const char *serial;
694 const char *filename;
695 Error *local_err = NULL;
696 int i;
697
698 /* Change legacy command line options into QMP ones */
699 static const struct {
700 const char *from;
701 const char *to;
702 } opt_renames[] = {
703 { "iops", "throttling.iops-total" },
704 { "iops_rd", "throttling.iops-read" },
705 { "iops_wr", "throttling.iops-write" },
706
707 { "bps", "throttling.bps-total" },
708 { "bps_rd", "throttling.bps-read" },
709 { "bps_wr", "throttling.bps-write" },
710
711 { "iops_max", "throttling.iops-total-max" },
712 { "iops_rd_max", "throttling.iops-read-max" },
713 { "iops_wr_max", "throttling.iops-write-max" },
714
715 { "bps_max", "throttling.bps-total-max" },
716 { "bps_rd_max", "throttling.bps-read-max" },
717 { "bps_wr_max", "throttling.bps-write-max" },
718
719 { "iops_size", "throttling.iops-size" },
720
721 { "group", "throttling.group" },
722
723 { "readonly", "read-only" },
724 };
725
726 for (i = 0; i < ARRAY_SIZE(opt_renames); i++) {
727 qemu_opt_rename(all_opts, opt_renames[i].from, opt_renames[i].to,
728 &local_err);
729 if (local_err) {
730 error_report_err(local_err);
731 return NULL;
732 }
733 }
734
735 value = qemu_opt_get(all_opts, "cache");
736 if (value) {
737 int flags = 0;
738
739 if (bdrv_parse_cache_flags(value, &flags) != 0) {
740 error_report("invalid cache option");
741 return NULL;
742 }
743
744 /* Specific options take precedence */
745 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_WB)) {
746 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_WB,
747 !!(flags & BDRV_O_CACHE_WB), &error_abort);
748 }
749 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_DIRECT)) {
750 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_DIRECT,
751 !!(flags & BDRV_O_NOCACHE), &error_abort);
752 }
753 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_NO_FLUSH)) {
754 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_NO_FLUSH,
755 !!(flags & BDRV_O_NO_FLUSH), &error_abort);
756 }
757 qemu_opt_unset(all_opts, "cache");
758 }
759
760 /* Get a QDict for processing the options */
761 bs_opts = qdict_new();
762 qemu_opts_to_qdict(all_opts, bs_opts);
763
764 legacy_opts = qemu_opts_create(&qemu_legacy_drive_opts, NULL, 0,
765 &error_abort);
766 qemu_opts_absorb_qdict(legacy_opts, bs_opts, &local_err);
767 if (local_err) {
768 error_report_err(local_err);
769 goto fail;
770 }
771
772 /* Deprecated option boot=[on|off] */
773 if (qemu_opt_get(legacy_opts, "boot") != NULL) {
774 fprintf(stderr, "qemu-kvm: boot=on|off is deprecated and will be "
775 "ignored. Future versions will reject this parameter. Please "
776 "update your scripts.\n");
777 }
778
779 /* Media type */
780 value = qemu_opt_get(legacy_opts, "media");
781 if (value) {
782 if (!strcmp(value, "disk")) {
783 media = MEDIA_DISK;
784 } else if (!strcmp(value, "cdrom")) {
785 media = MEDIA_CDROM;
786 read_only = true;
787 } else {
788 error_report("'%s' invalid media", value);
789 goto fail;
790 }
791 }
792
793 /* copy-on-read is disabled with a warning for read-only devices */
794 read_only |= qemu_opt_get_bool(legacy_opts, "read-only", false);
795 copy_on_read = qemu_opt_get_bool(legacy_opts, "copy-on-read", false);
796
797 if (read_only && copy_on_read) {
798 error_report("warning: disabling copy-on-read on read-only drive");
799 copy_on_read = false;
800 }
801
802 qdict_put(bs_opts, "read-only",
803 qstring_from_str(read_only ? "on" : "off"));
804 qdict_put(bs_opts, "copy-on-read",
805 qstring_from_str(copy_on_read ? "on" :"off"));
806
807 /* Controller type */
808 value = qemu_opt_get(legacy_opts, "if");
809 if (value) {
810 for (type = 0;
811 type < IF_COUNT && strcmp(value, if_name[type]);
812 type++) {
813 }
814 if (type == IF_COUNT) {
815 error_report("unsupported bus type '%s'", value);
816 goto fail;
817 }
818 } else {
819 type = block_default_type;
820 }
821
822 /* Geometry */
823 cyls = qemu_opt_get_number(legacy_opts, "cyls", 0);
824 heads = qemu_opt_get_number(legacy_opts, "heads", 0);
825 secs = qemu_opt_get_number(legacy_opts, "secs", 0);
826
827 if (cyls || heads || secs) {
828 if (cyls < 1) {
829 error_report("invalid physical cyls number");
830 goto fail;
831 }
832 if (heads < 1) {
833 error_report("invalid physical heads number");
834 goto fail;
835 }
836 if (secs < 1) {
837 error_report("invalid physical secs number");
838 goto fail;
839 }
840 }
841
842 translation = BIOS_ATA_TRANSLATION_AUTO;
843 value = qemu_opt_get(legacy_opts, "trans");
844 if (value != NULL) {
845 if (!cyls) {
846 error_report("'%s' trans must be used with cyls, heads and secs",
847 value);
848 goto fail;
849 }
850 if (!strcmp(value, "none")) {
851 translation = BIOS_ATA_TRANSLATION_NONE;
852 } else if (!strcmp(value, "lba")) {
853 translation = BIOS_ATA_TRANSLATION_LBA;
854 } else if (!strcmp(value, "large")) {
855 translation = BIOS_ATA_TRANSLATION_LARGE;
856 } else if (!strcmp(value, "rechs")) {
857 translation = BIOS_ATA_TRANSLATION_RECHS;
858 } else if (!strcmp(value, "auto")) {
859 translation = BIOS_ATA_TRANSLATION_AUTO;
860 } else {
861 error_report("'%s' invalid translation type", value);
862 goto fail;
863 }
864 }
865
866 if (media == MEDIA_CDROM) {
867 if (cyls || secs || heads) {
868 error_report("CHS can't be set with media=cdrom");
869 goto fail;
870 }
871 }
872
873 /* Device address specified by bus/unit or index.
874 * If none was specified, try to find the first free one. */
875 bus_id = qemu_opt_get_number(legacy_opts, "bus", 0);
876 unit_id = qemu_opt_get_number(legacy_opts, "unit", -1);
877 index = qemu_opt_get_number(legacy_opts, "index", -1);
878
879 max_devs = if_max_devs[type];
880
881 if (index != -1) {
882 if (bus_id != 0 || unit_id != -1) {
883 error_report("index cannot be used with bus and unit");
884 goto fail;
885 }
886 bus_id = drive_index_to_bus_id(type, index);
887 unit_id = drive_index_to_unit_id(type, index);
888 }
889
890 if (unit_id == -1) {
891 unit_id = 0;
892 while (drive_get(type, bus_id, unit_id) != NULL) {
893 unit_id++;
894 if (max_devs && unit_id >= max_devs) {
895 unit_id -= max_devs;
896 bus_id++;
897 }
898 }
899 }
900
901 if (max_devs && unit_id >= max_devs) {
902 error_report("unit %d too big (max is %d)", unit_id, max_devs - 1);
903 goto fail;
904 }
905
906 if (drive_get(type, bus_id, unit_id) != NULL) {
907 error_report("drive with bus=%d, unit=%d (index=%d) exists",
908 bus_id, unit_id, index);
909 goto fail;
910 }
911
912 /* Serial number */
913 serial = qemu_opt_get(legacy_opts, "serial");
914
915 /* no id supplied -> create one */
916 if (qemu_opts_id(all_opts) == NULL) {
917 char *new_id;
918 const char *mediastr = "";
919 if (type == IF_IDE || type == IF_SCSI) {
920 mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd";
921 }
922 if (max_devs) {
923 new_id = g_strdup_printf("%s%i%s%i", if_name[type], bus_id,
924 mediastr, unit_id);
925 } else {
926 new_id = g_strdup_printf("%s%s%i", if_name[type],
927 mediastr, unit_id);
928 }
929 qdict_put(bs_opts, "id", qstring_from_str(new_id));
930 g_free(new_id);
931 }
932
933 /* Add virtio block device */
934 devaddr = qemu_opt_get(legacy_opts, "addr");
935 if (devaddr && type != IF_VIRTIO) {
936 error_report("addr is not supported by this bus type");
937 goto fail;
938 }
939
940 if (type == IF_VIRTIO) {
941 QemuOpts *devopts;
942 devopts = qemu_opts_create(qemu_find_opts("device"), NULL, 0,
943 &error_abort);
944 if (arch_type == QEMU_ARCH_S390X) {
945 qemu_opt_set(devopts, "driver", "virtio-blk-ccw", &error_abort);
946 } else {
947 qemu_opt_set(devopts, "driver", "virtio-blk-pci", &error_abort);
948 }
949 qemu_opt_set(devopts, "drive", qdict_get_str(bs_opts, "id"),
950 &error_abort);
951 if (devaddr) {
952 qemu_opt_set(devopts, "addr", devaddr, &error_abort);
953 }
954 }
955
956 filename = qemu_opt_get(legacy_opts, "file");
957
958 /* Check werror/rerror compatibility with if=... */
959 werror = qemu_opt_get(legacy_opts, "werror");
960 if (werror != NULL) {
961 if (type != IF_IDE && type != IF_SCSI && type != IF_VIRTIO &&
962 type != IF_NONE) {
963 error_report("werror is not supported by this bus type");
964 goto fail;
965 }
966 qdict_put(bs_opts, "werror", qstring_from_str(werror));
967 }
968
969 rerror = qemu_opt_get(legacy_opts, "rerror");
970 if (rerror != NULL) {
971 if (type != IF_IDE && type != IF_VIRTIO && type != IF_SCSI &&
972 type != IF_NONE) {
973 error_report("rerror is not supported by this bus type");
974 goto fail;
975 }
976 qdict_put(bs_opts, "rerror", qstring_from_str(rerror));
977 }
978
979 /* Actual block device init: Functionality shared with blockdev-add */
980 blk = blockdev_init(filename, bs_opts, &local_err);
981 bs_opts = NULL;
982 if (!blk) {
983 if (local_err) {
984 error_report_err(local_err);
985 }
986 goto fail;
987 } else {
988 assert(!local_err);
989 }
990
991 /* Create legacy DriveInfo */
992 dinfo = g_malloc0(sizeof(*dinfo));
993 dinfo->opts = all_opts;
994
995 dinfo->cyls = cyls;
996 dinfo->heads = heads;
997 dinfo->secs = secs;
998 dinfo->trans = translation;
999
1000 dinfo->type = type;
1001 dinfo->bus = bus_id;
1002 dinfo->unit = unit_id;
1003 dinfo->devaddr = devaddr;
1004 dinfo->serial = g_strdup(serial);
1005
1006 blk_set_legacy_dinfo(blk, dinfo);
1007
1008 switch(type) {
1009 case IF_IDE:
1010 case IF_SCSI:
1011 case IF_XEN:
1012 case IF_NONE:
1013 dinfo->media_cd = media == MEDIA_CDROM;
1014 break;
1015 default:
1016 break;
1017 }
1018
1019 fail:
1020 qemu_opts_del(legacy_opts);
1021 QDECREF(bs_opts);
1022 return dinfo;
1023 }
1024
1025 void hmp_commit(Monitor *mon, const QDict *qdict)
1026 {
1027 const char *device = qdict_get_str(qdict, "device");
1028 BlockBackend *blk;
1029 int ret;
1030
1031 if (!strcmp(device, "all")) {
1032 ret = bdrv_commit_all();
1033 } else {
1034 blk = blk_by_name(device);
1035 if (!blk) {
1036 monitor_printf(mon, "Device '%s' not found\n", device);
1037 return;
1038 }
1039 ret = bdrv_commit(blk_bs(blk));
1040 }
1041 if (ret < 0) {
1042 monitor_printf(mon, "'commit' error for '%s': %s\n", device,
1043 strerror(-ret));
1044 }
1045 }
1046
1047 static void blockdev_do_action(int kind, void *data, Error **errp)
1048 {
1049 TransactionAction action;
1050 TransactionActionList list;
1051
1052 action.kind = kind;
1053 action.data = data;
1054 list.value = &action;
1055 list.next = NULL;
1056 qmp_transaction(&list, errp);
1057 }
1058
1059 void qmp_blockdev_snapshot_sync(bool has_device, const char *device,
1060 bool has_node_name, const char *node_name,
1061 const char *snapshot_file,
1062 bool has_snapshot_node_name,
1063 const char *snapshot_node_name,
1064 bool has_format, const char *format,
1065 bool has_mode, NewImageMode mode, Error **errp)
1066 {
1067 BlockdevSnapshot snapshot = {
1068 .has_device = has_device,
1069 .device = (char *) device,
1070 .has_node_name = has_node_name,
1071 .node_name = (char *) node_name,
1072 .snapshot_file = (char *) snapshot_file,
1073 .has_snapshot_node_name = has_snapshot_node_name,
1074 .snapshot_node_name = (char *) snapshot_node_name,
1075 .has_format = has_format,
1076 .format = (char *) format,
1077 .has_mode = has_mode,
1078 .mode = mode,
1079 };
1080 blockdev_do_action(TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC,
1081 &snapshot, errp);
1082 }
1083
1084 void qmp_blockdev_snapshot_internal_sync(const char *device,
1085 const char *name,
1086 Error **errp)
1087 {
1088 BlockdevSnapshotInternal snapshot = {
1089 .device = (char *) device,
1090 .name = (char *) name
1091 };
1092
1093 blockdev_do_action(TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC,
1094 &snapshot, errp);
1095 }
1096
1097 SnapshotInfo *qmp_blockdev_snapshot_delete_internal_sync(const char *device,
1098 bool has_id,
1099 const char *id,
1100 bool has_name,
1101 const char *name,
1102 Error **errp)
1103 {
1104 BlockDriverState *bs;
1105 BlockBackend *blk;
1106 AioContext *aio_context;
1107 QEMUSnapshotInfo sn;
1108 Error *local_err = NULL;
1109 SnapshotInfo *info = NULL;
1110 int ret;
1111
1112 blk = blk_by_name(device);
1113 if (!blk) {
1114 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1115 "Device '%s' not found", device);
1116 return NULL;
1117 }
1118 bs = blk_bs(blk);
1119
1120 if (!has_id) {
1121 id = NULL;
1122 }
1123
1124 if (!has_name) {
1125 name = NULL;
1126 }
1127
1128 if (!id && !name) {
1129 error_setg(errp, "Name or id must be provided");
1130 return NULL;
1131 }
1132
1133 aio_context = bdrv_get_aio_context(bs);
1134 aio_context_acquire(aio_context);
1135
1136 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT_DELETE, errp)) {
1137 goto out_aio_context;
1138 }
1139
1140 ret = bdrv_snapshot_find_by_id_and_name(bs, id, name, &sn, &local_err);
1141 if (local_err) {
1142 error_propagate(errp, local_err);
1143 goto out_aio_context;
1144 }
1145 if (!ret) {
1146 error_setg(errp,
1147 "Snapshot with id '%s' and name '%s' does not exist on "
1148 "device '%s'",
1149 STR_OR_NULL(id), STR_OR_NULL(name), device);
1150 goto out_aio_context;
1151 }
1152
1153 bdrv_snapshot_delete(bs, id, name, &local_err);
1154 if (local_err) {
1155 error_propagate(errp, local_err);
1156 goto out_aio_context;
1157 }
1158
1159 aio_context_release(aio_context);
1160
1161 info = g_new0(SnapshotInfo, 1);
1162 info->id = g_strdup(sn.id_str);
1163 info->name = g_strdup(sn.name);
1164 info->date_nsec = sn.date_nsec;
1165 info->date_sec = sn.date_sec;
1166 info->vm_state_size = sn.vm_state_size;
1167 info->vm_clock_nsec = sn.vm_clock_nsec % 1000000000;
1168 info->vm_clock_sec = sn.vm_clock_nsec / 1000000000;
1169
1170 return info;
1171
1172 out_aio_context:
1173 aio_context_release(aio_context);
1174 return NULL;
1175 }
1176
1177 /**
1178 * block_dirty_bitmap_lookup:
1179 * Return a dirty bitmap (if present), after validating
1180 * the node reference and bitmap names.
1181 *
1182 * @node: The name of the BDS node to search for bitmaps
1183 * @name: The name of the bitmap to search for
1184 * @pbs: Output pointer for BDS lookup, if desired. Can be NULL.
1185 * @paio: Output pointer for aio_context acquisition, if desired. Can be NULL.
1186 * @errp: Output pointer for error information. Can be NULL.
1187 *
1188 * @return: A bitmap object on success, or NULL on failure.
1189 */
1190 static BdrvDirtyBitmap *block_dirty_bitmap_lookup(const char *node,
1191 const char *name,
1192 BlockDriverState **pbs,
1193 AioContext **paio,
1194 Error **errp)
1195 {
1196 BlockDriverState *bs;
1197 BdrvDirtyBitmap *bitmap;
1198 AioContext *aio_context;
1199
1200 if (!node) {
1201 error_setg(errp, "Node cannot be NULL");
1202 return NULL;
1203 }
1204 if (!name) {
1205 error_setg(errp, "Bitmap name cannot be NULL");
1206 return NULL;
1207 }
1208 bs = bdrv_lookup_bs(node, node, NULL);
1209 if (!bs) {
1210 error_setg(errp, "Node '%s' not found", node);
1211 return NULL;
1212 }
1213
1214 aio_context = bdrv_get_aio_context(bs);
1215 aio_context_acquire(aio_context);
1216
1217 bitmap = bdrv_find_dirty_bitmap(bs, name);
1218 if (!bitmap) {
1219 error_setg(errp, "Dirty bitmap '%s' not found", name);
1220 goto fail;
1221 }
1222
1223 if (pbs) {
1224 *pbs = bs;
1225 }
1226 if (paio) {
1227 *paio = aio_context;
1228 } else {
1229 aio_context_release(aio_context);
1230 }
1231
1232 return bitmap;
1233
1234 fail:
1235 aio_context_release(aio_context);
1236 return NULL;
1237 }
1238
1239 /* New and old BlockDriverState structs for atomic group operations */
1240
1241 typedef struct BlkTransactionState BlkTransactionState;
1242
1243 /* Only prepare() may fail. In a single transaction, only one of commit() or
1244 abort() will be called, clean() will always be called if it present. */
1245 typedef struct BdrvActionOps {
1246 /* Size of state struct, in bytes. */
1247 size_t instance_size;
1248 /* Prepare the work, must NOT be NULL. */
1249 void (*prepare)(BlkTransactionState *common, Error **errp);
1250 /* Commit the changes, can be NULL. */
1251 void (*commit)(BlkTransactionState *common);
1252 /* Abort the changes on fail, can be NULL. */
1253 void (*abort)(BlkTransactionState *common);
1254 /* Clean up resource in the end, can be NULL. */
1255 void (*clean)(BlkTransactionState *common);
1256 } BdrvActionOps;
1257
1258 /*
1259 * This structure must be arranged as first member in child type, assuming
1260 * that compiler will also arrange it to the same address with parent instance.
1261 * Later it will be used in free().
1262 */
1263 struct BlkTransactionState {
1264 TransactionAction *action;
1265 const BdrvActionOps *ops;
1266 QSIMPLEQ_ENTRY(BlkTransactionState) entry;
1267 };
1268
1269 /* internal snapshot private data */
1270 typedef struct InternalSnapshotState {
1271 BlkTransactionState common;
1272 BlockDriverState *bs;
1273 AioContext *aio_context;
1274 QEMUSnapshotInfo sn;
1275 } InternalSnapshotState;
1276
1277 static void internal_snapshot_prepare(BlkTransactionState *common,
1278 Error **errp)
1279 {
1280 Error *local_err = NULL;
1281 const char *device;
1282 const char *name;
1283 BlockBackend *blk;
1284 BlockDriverState *bs;
1285 QEMUSnapshotInfo old_sn, *sn;
1286 bool ret;
1287 qemu_timeval tv;
1288 BlockdevSnapshotInternal *internal;
1289 InternalSnapshotState *state;
1290 int ret1;
1291
1292 g_assert(common->action->kind ==
1293 TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC);
1294 internal = common->action->blockdev_snapshot_internal_sync;
1295 state = DO_UPCAST(InternalSnapshotState, common, common);
1296
1297 /* 1. parse input */
1298 device = internal->device;
1299 name = internal->name;
1300
1301 /* 2. check for validation */
1302 blk = blk_by_name(device);
1303 if (!blk) {
1304 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1305 "Device '%s' not found", device);
1306 return;
1307 }
1308 bs = blk_bs(blk);
1309
1310 /* AioContext is released in .clean() */
1311 state->aio_context = bdrv_get_aio_context(bs);
1312 aio_context_acquire(state->aio_context);
1313
1314 if (!bdrv_is_inserted(bs)) {
1315 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1316 return;
1317 }
1318
1319 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT, errp)) {
1320 return;
1321 }
1322
1323 if (bdrv_is_read_only(bs)) {
1324 error_setg(errp, "Device '%s' is read only", device);
1325 return;
1326 }
1327
1328 if (!bdrv_can_snapshot(bs)) {
1329 error_setg(errp, "Block format '%s' used by device '%s' "
1330 "does not support internal snapshots",
1331 bs->drv->format_name, device);
1332 return;
1333 }
1334
1335 if (!strlen(name)) {
1336 error_setg(errp, "Name is empty");
1337 return;
1338 }
1339
1340 /* check whether a snapshot with name exist */
1341 ret = bdrv_snapshot_find_by_id_and_name(bs, NULL, name, &old_sn,
1342 &local_err);
1343 if (local_err) {
1344 error_propagate(errp, local_err);
1345 return;
1346 } else if (ret) {
1347 error_setg(errp,
1348 "Snapshot with name '%s' already exists on device '%s'",
1349 name, device);
1350 return;
1351 }
1352
1353 /* 3. take the snapshot */
1354 sn = &state->sn;
1355 pstrcpy(sn->name, sizeof(sn->name), name);
1356 qemu_gettimeofday(&tv);
1357 sn->date_sec = tv.tv_sec;
1358 sn->date_nsec = tv.tv_usec * 1000;
1359 sn->vm_clock_nsec = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
1360
1361 ret1 = bdrv_snapshot_create(bs, sn);
1362 if (ret1 < 0) {
1363 error_setg_errno(errp, -ret1,
1364 "Failed to create snapshot '%s' on device '%s'",
1365 name, device);
1366 return;
1367 }
1368
1369 /* 4. succeed, mark a snapshot is created */
1370 state->bs = bs;
1371 }
1372
1373 static void internal_snapshot_abort(BlkTransactionState *common)
1374 {
1375 InternalSnapshotState *state =
1376 DO_UPCAST(InternalSnapshotState, common, common);
1377 BlockDriverState *bs = state->bs;
1378 QEMUSnapshotInfo *sn = &state->sn;
1379 Error *local_error = NULL;
1380
1381 if (!bs) {
1382 return;
1383 }
1384
1385 if (bdrv_snapshot_delete(bs, sn->id_str, sn->name, &local_error) < 0) {
1386 error_report("Failed to delete snapshot with id '%s' and name '%s' on "
1387 "device '%s' in abort: %s",
1388 sn->id_str,
1389 sn->name,
1390 bdrv_get_device_name(bs),
1391 error_get_pretty(local_error));
1392 error_free(local_error);
1393 }
1394 }
1395
1396 static void internal_snapshot_clean(BlkTransactionState *common)
1397 {
1398 InternalSnapshotState *state = DO_UPCAST(InternalSnapshotState,
1399 common, common);
1400
1401 if (state->aio_context) {
1402 aio_context_release(state->aio_context);
1403 }
1404 }
1405
1406 /* external snapshot private data */
1407 typedef struct ExternalSnapshotState {
1408 BlkTransactionState common;
1409 BlockDriverState *old_bs;
1410 BlockDriverState *new_bs;
1411 AioContext *aio_context;
1412 } ExternalSnapshotState;
1413
1414 static void external_snapshot_prepare(BlkTransactionState *common,
1415 Error **errp)
1416 {
1417 BlockDriver *drv;
1418 int flags, ret;
1419 QDict *options = NULL;
1420 Error *local_err = NULL;
1421 bool has_device = false;
1422 const char *device;
1423 bool has_node_name = false;
1424 const char *node_name;
1425 bool has_snapshot_node_name = false;
1426 const char *snapshot_node_name;
1427 const char *new_image_file;
1428 const char *format = "qcow2";
1429 enum NewImageMode mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
1430 ExternalSnapshotState *state =
1431 DO_UPCAST(ExternalSnapshotState, common, common);
1432 TransactionAction *action = common->action;
1433
1434 /* get parameters */
1435 g_assert(action->kind == TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC);
1436
1437 has_device = action->blockdev_snapshot_sync->has_device;
1438 device = action->blockdev_snapshot_sync->device;
1439 has_node_name = action->blockdev_snapshot_sync->has_node_name;
1440 node_name = action->blockdev_snapshot_sync->node_name;
1441 has_snapshot_node_name =
1442 action->blockdev_snapshot_sync->has_snapshot_node_name;
1443 snapshot_node_name = action->blockdev_snapshot_sync->snapshot_node_name;
1444
1445 new_image_file = action->blockdev_snapshot_sync->snapshot_file;
1446 if (action->blockdev_snapshot_sync->has_format) {
1447 format = action->blockdev_snapshot_sync->format;
1448 }
1449 if (action->blockdev_snapshot_sync->has_mode) {
1450 mode = action->blockdev_snapshot_sync->mode;
1451 }
1452
1453 /* start processing */
1454 drv = bdrv_find_format(format);
1455 if (!drv) {
1456 error_setg(errp, QERR_INVALID_BLOCK_FORMAT, format);
1457 return;
1458 }
1459
1460 state->old_bs = bdrv_lookup_bs(has_device ? device : NULL,
1461 has_node_name ? node_name : NULL,
1462 &local_err);
1463 if (local_err) {
1464 error_propagate(errp, local_err);
1465 return;
1466 }
1467
1468 if (has_node_name && !has_snapshot_node_name) {
1469 error_setg(errp, "New snapshot node name missing");
1470 return;
1471 }
1472
1473 if (has_snapshot_node_name && bdrv_find_node(snapshot_node_name)) {
1474 error_setg(errp, "New snapshot node name already existing");
1475 return;
1476 }
1477
1478 /* Acquire AioContext now so any threads operating on old_bs stop */
1479 state->aio_context = bdrv_get_aio_context(state->old_bs);
1480 aio_context_acquire(state->aio_context);
1481
1482 if (!bdrv_is_inserted(state->old_bs)) {
1483 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1484 return;
1485 }
1486
1487 if (bdrv_op_is_blocked(state->old_bs,
1488 BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT, errp)) {
1489 return;
1490 }
1491
1492 if (!bdrv_is_read_only(state->old_bs)) {
1493 if (bdrv_flush(state->old_bs)) {
1494 error_setg(errp, QERR_IO_ERROR);
1495 return;
1496 }
1497 }
1498
1499 if (!bdrv_is_first_non_filter(state->old_bs)) {
1500 error_setg(errp, QERR_FEATURE_DISABLED, "snapshot");
1501 return;
1502 }
1503
1504 flags = state->old_bs->open_flags;
1505
1506 /* create new image w/backing file */
1507 if (mode != NEW_IMAGE_MODE_EXISTING) {
1508 bdrv_img_create(new_image_file, format,
1509 state->old_bs->filename,
1510 state->old_bs->drv->format_name,
1511 NULL, -1, flags, &local_err, false);
1512 if (local_err) {
1513 error_propagate(errp, local_err);
1514 return;
1515 }
1516 }
1517
1518 if (has_snapshot_node_name) {
1519 options = qdict_new();
1520 qdict_put(options, "node-name",
1521 qstring_from_str(snapshot_node_name));
1522 }
1523
1524 /* TODO Inherit bs->options or only take explicit options with an
1525 * extended QMP command? */
1526 assert(state->new_bs == NULL);
1527 ret = bdrv_open(&state->new_bs, new_image_file, NULL, options,
1528 flags | BDRV_O_NO_BACKING, drv, &local_err);
1529 /* We will manually add the backing_hd field to the bs later */
1530 if (ret != 0) {
1531 error_propagate(errp, local_err);
1532 }
1533 }
1534
1535 static void external_snapshot_commit(BlkTransactionState *common)
1536 {
1537 ExternalSnapshotState *state =
1538 DO_UPCAST(ExternalSnapshotState, common, common);
1539
1540 bdrv_set_aio_context(state->new_bs, state->aio_context);
1541
1542 /* This removes our old bs and adds the new bs */
1543 bdrv_append(state->new_bs, state->old_bs);
1544 /* We don't need (or want) to use the transactional
1545 * bdrv_reopen_multiple() across all the entries at once, because we
1546 * don't want to abort all of them if one of them fails the reopen */
1547 bdrv_reopen(state->new_bs, state->new_bs->open_flags & ~BDRV_O_RDWR,
1548 NULL);
1549
1550 aio_context_release(state->aio_context);
1551 }
1552
1553 static void external_snapshot_abort(BlkTransactionState *common)
1554 {
1555 ExternalSnapshotState *state =
1556 DO_UPCAST(ExternalSnapshotState, common, common);
1557 if (state->new_bs) {
1558 bdrv_unref(state->new_bs);
1559 }
1560 if (state->aio_context) {
1561 aio_context_release(state->aio_context);
1562 }
1563 }
1564
1565 typedef struct DriveBackupState {
1566 BlkTransactionState common;
1567 BlockDriverState *bs;
1568 AioContext *aio_context;
1569 BlockJob *job;
1570 } DriveBackupState;
1571
1572 static void drive_backup_prepare(BlkTransactionState *common, Error **errp)
1573 {
1574 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1575 BlockDriverState *bs;
1576 BlockBackend *blk;
1577 DriveBackup *backup;
1578 Error *local_err = NULL;
1579
1580 assert(common->action->kind == TRANSACTION_ACTION_KIND_DRIVE_BACKUP);
1581 backup = common->action->drive_backup;
1582
1583 blk = blk_by_name(backup->device);
1584 if (!blk) {
1585 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1586 "Device '%s' not found", backup->device);
1587 return;
1588 }
1589 bs = blk_bs(blk);
1590
1591 /* AioContext is released in .clean() */
1592 state->aio_context = bdrv_get_aio_context(bs);
1593 aio_context_acquire(state->aio_context);
1594
1595 qmp_drive_backup(backup->device, backup->target,
1596 backup->has_format, backup->format,
1597 backup->sync,
1598 backup->has_mode, backup->mode,
1599 backup->has_speed, backup->speed,
1600 backup->has_bitmap, backup->bitmap,
1601 backup->has_on_source_error, backup->on_source_error,
1602 backup->has_on_target_error, backup->on_target_error,
1603 &local_err);
1604 if (local_err) {
1605 error_propagate(errp, local_err);
1606 return;
1607 }
1608
1609 state->bs = bs;
1610 state->job = state->bs->job;
1611 }
1612
1613 static void drive_backup_abort(BlkTransactionState *common)
1614 {
1615 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1616 BlockDriverState *bs = state->bs;
1617
1618 /* Only cancel if it's the job we started */
1619 if (bs && bs->job && bs->job == state->job) {
1620 block_job_cancel_sync(bs->job);
1621 }
1622 }
1623
1624 static void drive_backup_clean(BlkTransactionState *common)
1625 {
1626 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1627
1628 if (state->aio_context) {
1629 aio_context_release(state->aio_context);
1630 }
1631 }
1632
1633 typedef struct BlockdevBackupState {
1634 BlkTransactionState common;
1635 BlockDriverState *bs;
1636 BlockJob *job;
1637 AioContext *aio_context;
1638 } BlockdevBackupState;
1639
1640 static void blockdev_backup_prepare(BlkTransactionState *common, Error **errp)
1641 {
1642 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
1643 BlockdevBackup *backup;
1644 BlockDriverState *bs, *target;
1645 BlockBackend *blk;
1646 Error *local_err = NULL;
1647
1648 assert(common->action->kind == TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP);
1649 backup = common->action->blockdev_backup;
1650
1651 blk = blk_by_name(backup->device);
1652 if (!blk) {
1653 error_setg(errp, "Device '%s' not found", backup->device);
1654 return;
1655 }
1656 bs = blk_bs(blk);
1657
1658 blk = blk_by_name(backup->target);
1659 if (!blk) {
1660 error_setg(errp, "Device '%s' not found", backup->target);
1661 return;
1662 }
1663 target = blk_bs(blk);
1664
1665 /* AioContext is released in .clean() */
1666 state->aio_context = bdrv_get_aio_context(bs);
1667 if (state->aio_context != bdrv_get_aio_context(target)) {
1668 state->aio_context = NULL;
1669 error_setg(errp, "Backup between two IO threads is not implemented");
1670 return;
1671 }
1672 aio_context_acquire(state->aio_context);
1673
1674 qmp_blockdev_backup(backup->device, backup->target,
1675 backup->sync,
1676 backup->has_speed, backup->speed,
1677 backup->has_on_source_error, backup->on_source_error,
1678 backup->has_on_target_error, backup->on_target_error,
1679 &local_err);
1680 if (local_err) {
1681 error_propagate(errp, local_err);
1682 return;
1683 }
1684
1685 state->bs = bs;
1686 state->job = state->bs->job;
1687 }
1688
1689 static void blockdev_backup_abort(BlkTransactionState *common)
1690 {
1691 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
1692 BlockDriverState *bs = state->bs;
1693
1694 /* Only cancel if it's the job we started */
1695 if (bs && bs->job && bs->job == state->job) {
1696 block_job_cancel_sync(bs->job);
1697 }
1698 }
1699
1700 static void blockdev_backup_clean(BlkTransactionState *common)
1701 {
1702 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
1703
1704 if (state->aio_context) {
1705 aio_context_release(state->aio_context);
1706 }
1707 }
1708
1709 static void abort_prepare(BlkTransactionState *common, Error **errp)
1710 {
1711 error_setg(errp, "Transaction aborted using Abort action");
1712 }
1713
1714 static void abort_commit(BlkTransactionState *common)
1715 {
1716 g_assert_not_reached(); /* this action never succeeds */
1717 }
1718
1719 static const BdrvActionOps actions[] = {
1720 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC] = {
1721 .instance_size = sizeof(ExternalSnapshotState),
1722 .prepare = external_snapshot_prepare,
1723 .commit = external_snapshot_commit,
1724 .abort = external_snapshot_abort,
1725 },
1726 [TRANSACTION_ACTION_KIND_DRIVE_BACKUP] = {
1727 .instance_size = sizeof(DriveBackupState),
1728 .prepare = drive_backup_prepare,
1729 .abort = drive_backup_abort,
1730 .clean = drive_backup_clean,
1731 },
1732 [TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP] = {
1733 .instance_size = sizeof(BlockdevBackupState),
1734 .prepare = blockdev_backup_prepare,
1735 .abort = blockdev_backup_abort,
1736 .clean = blockdev_backup_clean,
1737 },
1738 [TRANSACTION_ACTION_KIND_ABORT] = {
1739 .instance_size = sizeof(BlkTransactionState),
1740 .prepare = abort_prepare,
1741 .commit = abort_commit,
1742 },
1743 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC] = {
1744 .instance_size = sizeof(InternalSnapshotState),
1745 .prepare = internal_snapshot_prepare,
1746 .abort = internal_snapshot_abort,
1747 .clean = internal_snapshot_clean,
1748 },
1749 };
1750
1751 /*
1752 * 'Atomic' group operations. The operations are performed as a set, and if
1753 * any fail then we roll back all operations in the group.
1754 */
1755 void qmp_transaction(TransactionActionList *dev_list, Error **errp)
1756 {
1757 TransactionActionList *dev_entry = dev_list;
1758 BlkTransactionState *state, *next;
1759 Error *local_err = NULL;
1760
1761 QSIMPLEQ_HEAD(snap_bdrv_states, BlkTransactionState) snap_bdrv_states;
1762 QSIMPLEQ_INIT(&snap_bdrv_states);
1763
1764 /* drain all i/o before any operations */
1765 bdrv_drain_all();
1766
1767 /* We don't do anything in this loop that commits us to the operations */
1768 while (NULL != dev_entry) {
1769 TransactionAction *dev_info = NULL;
1770 const BdrvActionOps *ops;
1771
1772 dev_info = dev_entry->value;
1773 dev_entry = dev_entry->next;
1774
1775 assert(dev_info->kind < ARRAY_SIZE(actions));
1776
1777 ops = &actions[dev_info->kind];
1778 assert(ops->instance_size > 0);
1779
1780 state = g_malloc0(ops->instance_size);
1781 state->ops = ops;
1782 state->action = dev_info;
1783 QSIMPLEQ_INSERT_TAIL(&snap_bdrv_states, state, entry);
1784
1785 state->ops->prepare(state, &local_err);
1786 if (local_err) {
1787 error_propagate(errp, local_err);
1788 goto delete_and_fail;
1789 }
1790 }
1791
1792 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) {
1793 if (state->ops->commit) {
1794 state->ops->commit(state);
1795 }
1796 }
1797
1798 /* success */
1799 goto exit;
1800
1801 delete_and_fail:
1802 /* failure, and it is all-or-none; roll back all operations */
1803 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) {
1804 if (state->ops->abort) {
1805 state->ops->abort(state);
1806 }
1807 }
1808 exit:
1809 QSIMPLEQ_FOREACH_SAFE(state, &snap_bdrv_states, entry, next) {
1810 if (state->ops->clean) {
1811 state->ops->clean(state);
1812 }
1813 g_free(state);
1814 }
1815 }
1816
1817
1818 static void eject_device(BlockBackend *blk, int force, Error **errp)
1819 {
1820 BlockDriverState *bs = blk_bs(blk);
1821 AioContext *aio_context;
1822
1823 aio_context = bdrv_get_aio_context(bs);
1824 aio_context_acquire(aio_context);
1825
1826 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_EJECT, errp)) {
1827 goto out;
1828 }
1829 if (!blk_dev_has_removable_media(blk)) {
1830 error_setg(errp, "Device '%s' is not removable",
1831 bdrv_get_device_name(bs));
1832 goto out;
1833 }
1834
1835 if (blk_dev_is_medium_locked(blk) && !blk_dev_is_tray_open(blk)) {
1836 blk_dev_eject_request(blk, force);
1837 if (!force) {
1838 error_setg(errp, "Device '%s' is locked",
1839 bdrv_get_device_name(bs));
1840 goto out;
1841 }
1842 }
1843
1844 bdrv_close(bs);
1845
1846 out:
1847 aio_context_release(aio_context);
1848 }
1849
1850 void qmp_eject(const char *device, bool has_force, bool force, Error **errp)
1851 {
1852 BlockBackend *blk;
1853
1854 blk = blk_by_name(device);
1855 if (!blk) {
1856 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1857 "Device '%s' not found", device);
1858 return;
1859 }
1860
1861 eject_device(blk, force, errp);
1862 }
1863
1864 void qmp_block_passwd(bool has_device, const char *device,
1865 bool has_node_name, const char *node_name,
1866 const char *password, Error **errp)
1867 {
1868 Error *local_err = NULL;
1869 BlockDriverState *bs;
1870 AioContext *aio_context;
1871
1872 bs = bdrv_lookup_bs(has_device ? device : NULL,
1873 has_node_name ? node_name : NULL,
1874 &local_err);
1875 if (local_err) {
1876 error_propagate(errp, local_err);
1877 return;
1878 }
1879
1880 aio_context = bdrv_get_aio_context(bs);
1881 aio_context_acquire(aio_context);
1882
1883 bdrv_add_key(bs, password, errp);
1884
1885 aio_context_release(aio_context);
1886 }
1887
1888 /* Assumes AioContext is held */
1889 static void qmp_bdrv_open_encrypted(BlockDriverState *bs, const char *filename,
1890 int bdrv_flags, BlockDriver *drv,
1891 const char *password, Error **errp)
1892 {
1893 Error *local_err = NULL;
1894 int ret;
1895
1896 ret = bdrv_open(&bs, filename, NULL, NULL, bdrv_flags, drv, &local_err);
1897 if (ret < 0) {
1898 error_propagate(errp, local_err);
1899 return;
1900 }
1901
1902 bdrv_add_key(bs, password, errp);
1903 }
1904
1905 void qmp_change_blockdev(const char *device, const char *filename,
1906 const char *format, Error **errp)
1907 {
1908 BlockBackend *blk;
1909 BlockDriverState *bs;
1910 AioContext *aio_context;
1911 BlockDriver *drv = NULL;
1912 int bdrv_flags;
1913 Error *err = NULL;
1914
1915 blk = blk_by_name(device);
1916 if (!blk) {
1917 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1918 "Device '%s' not found", device);
1919 return;
1920 }
1921 bs = blk_bs(blk);
1922
1923 aio_context = bdrv_get_aio_context(bs);
1924 aio_context_acquire(aio_context);
1925
1926 if (format) {
1927 drv = bdrv_find_whitelisted_format(format, bs->read_only);
1928 if (!drv) {
1929 error_setg(errp, QERR_INVALID_BLOCK_FORMAT, format);
1930 goto out;
1931 }
1932 }
1933
1934 eject_device(blk, 0, &err);
1935 if (err) {
1936 error_propagate(errp, err);
1937 goto out;
1938 }
1939
1940 bdrv_flags = bdrv_is_read_only(bs) ? 0 : BDRV_O_RDWR;
1941 bdrv_flags |= bdrv_is_snapshot(bs) ? BDRV_O_SNAPSHOT : 0;
1942
1943 qmp_bdrv_open_encrypted(bs, filename, bdrv_flags, drv, NULL, errp);
1944
1945 out:
1946 aio_context_release(aio_context);
1947 }
1948
1949 /* throttling disk I/O limits */
1950 void qmp_block_set_io_throttle(const char *device, int64_t bps, int64_t bps_rd,
1951 int64_t bps_wr,
1952 int64_t iops,
1953 int64_t iops_rd,
1954 int64_t iops_wr,
1955 bool has_bps_max,
1956 int64_t bps_max,
1957 bool has_bps_rd_max,
1958 int64_t bps_rd_max,
1959 bool has_bps_wr_max,
1960 int64_t bps_wr_max,
1961 bool has_iops_max,
1962 int64_t iops_max,
1963 bool has_iops_rd_max,
1964 int64_t iops_rd_max,
1965 bool has_iops_wr_max,
1966 int64_t iops_wr_max,
1967 bool has_iops_size,
1968 int64_t iops_size,
1969 bool has_group,
1970 const char *group, Error **errp)
1971 {
1972 ThrottleConfig cfg;
1973 BlockDriverState *bs;
1974 BlockBackend *blk;
1975 AioContext *aio_context;
1976
1977 blk = blk_by_name(device);
1978 if (!blk) {
1979 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1980 "Device '%s' not found", device);
1981 return;
1982 }
1983 bs = blk_bs(blk);
1984
1985 memset(&cfg, 0, sizeof(cfg));
1986 cfg.buckets[THROTTLE_BPS_TOTAL].avg = bps;
1987 cfg.buckets[THROTTLE_BPS_READ].avg = bps_rd;
1988 cfg.buckets[THROTTLE_BPS_WRITE].avg = bps_wr;
1989
1990 cfg.buckets[THROTTLE_OPS_TOTAL].avg = iops;
1991 cfg.buckets[THROTTLE_OPS_READ].avg = iops_rd;
1992 cfg.buckets[THROTTLE_OPS_WRITE].avg = iops_wr;
1993
1994 if (has_bps_max) {
1995 cfg.buckets[THROTTLE_BPS_TOTAL].max = bps_max;
1996 }
1997 if (has_bps_rd_max) {
1998 cfg.buckets[THROTTLE_BPS_READ].max = bps_rd_max;
1999 }
2000 if (has_bps_wr_max) {
2001 cfg.buckets[THROTTLE_BPS_WRITE].max = bps_wr_max;
2002 }
2003 if (has_iops_max) {
2004 cfg.buckets[THROTTLE_OPS_TOTAL].max = iops_max;
2005 }
2006 if (has_iops_rd_max) {
2007 cfg.buckets[THROTTLE_OPS_READ].max = iops_rd_max;
2008 }
2009 if (has_iops_wr_max) {
2010 cfg.buckets[THROTTLE_OPS_WRITE].max = iops_wr_max;
2011 }
2012
2013 if (has_iops_size) {
2014 cfg.op_size = iops_size;
2015 }
2016
2017 if (!check_throttle_config(&cfg, errp)) {
2018 return;
2019 }
2020
2021 aio_context = bdrv_get_aio_context(bs);
2022 aio_context_acquire(aio_context);
2023
2024 if (throttle_enabled(&cfg)) {
2025 /* Enable I/O limits if they're not enabled yet, otherwise
2026 * just update the throttling group. */
2027 if (!bs->io_limits_enabled) {
2028 bdrv_io_limits_enable(bs, has_group ? group : device);
2029 } else if (has_group) {
2030 bdrv_io_limits_update_group(bs, group);
2031 }
2032 /* Set the new throttling configuration */
2033 bdrv_set_io_limits(bs, &cfg);
2034 } else if (bs->io_limits_enabled) {
2035 /* If all throttling settings are set to 0, disable I/O limits */
2036 bdrv_io_limits_disable(bs);
2037 }
2038
2039 aio_context_release(aio_context);
2040 }
2041
2042 void qmp_block_dirty_bitmap_add(const char *node, const char *name,
2043 bool has_granularity, uint32_t granularity,
2044 Error **errp)
2045 {
2046 AioContext *aio_context;
2047 BlockDriverState *bs;
2048
2049 if (!name || name[0] == '\0') {
2050 error_setg(errp, "Bitmap name cannot be empty");
2051 return;
2052 }
2053
2054 bs = bdrv_lookup_bs(node, node, errp);
2055 if (!bs) {
2056 return;
2057 }
2058
2059 aio_context = bdrv_get_aio_context(bs);
2060 aio_context_acquire(aio_context);
2061
2062 if (has_granularity) {
2063 if (granularity < 512 || !is_power_of_2(granularity)) {
2064 error_setg(errp, "Granularity must be power of 2 "
2065 "and at least 512");
2066 goto out;
2067 }
2068 } else {
2069 /* Default to cluster size, if available: */
2070 granularity = bdrv_get_default_bitmap_granularity(bs);
2071 }
2072
2073 bdrv_create_dirty_bitmap(bs, granularity, name, errp);
2074
2075 out:
2076 aio_context_release(aio_context);
2077 }
2078
2079 void qmp_block_dirty_bitmap_remove(const char *node, const char *name,
2080 Error **errp)
2081 {
2082 AioContext *aio_context;
2083 BlockDriverState *bs;
2084 BdrvDirtyBitmap *bitmap;
2085
2086 bitmap = block_dirty_bitmap_lookup(node, name, &bs, &aio_context, errp);
2087 if (!bitmap || !bs) {
2088 return;
2089 }
2090
2091 if (bdrv_dirty_bitmap_frozen(bitmap)) {
2092 error_setg(errp,
2093 "Bitmap '%s' is currently frozen and cannot be removed",
2094 name);
2095 goto out;
2096 }
2097 bdrv_dirty_bitmap_make_anon(bitmap);
2098 bdrv_release_dirty_bitmap(bs, bitmap);
2099
2100 out:
2101 aio_context_release(aio_context);
2102 }
2103
2104 /**
2105 * Completely clear a bitmap, for the purposes of synchronizing a bitmap
2106 * immediately after a full backup operation.
2107 */
2108 void qmp_block_dirty_bitmap_clear(const char *node, const char *name,
2109 Error **errp)
2110 {
2111 AioContext *aio_context;
2112 BdrvDirtyBitmap *bitmap;
2113 BlockDriverState *bs;
2114
2115 bitmap = block_dirty_bitmap_lookup(node, name, &bs, &aio_context, errp);
2116 if (!bitmap || !bs) {
2117 return;
2118 }
2119
2120 if (bdrv_dirty_bitmap_frozen(bitmap)) {
2121 error_setg(errp,
2122 "Bitmap '%s' is currently frozen and cannot be modified",
2123 name);
2124 goto out;
2125 } else if (!bdrv_dirty_bitmap_enabled(bitmap)) {
2126 error_setg(errp,
2127 "Bitmap '%s' is currently disabled and cannot be cleared",
2128 name);
2129 goto out;
2130 }
2131
2132 bdrv_clear_dirty_bitmap(bitmap);
2133
2134 out:
2135 aio_context_release(aio_context);
2136 }
2137
2138 void hmp_drive_del(Monitor *mon, const QDict *qdict)
2139 {
2140 const char *id = qdict_get_str(qdict, "id");
2141 BlockBackend *blk;
2142 BlockDriverState *bs;
2143 AioContext *aio_context;
2144 Error *local_err = NULL;
2145
2146 blk = blk_by_name(id);
2147 if (!blk) {
2148 error_report("Device '%s' not found", id);
2149 return;
2150 }
2151 bs = blk_bs(blk);
2152
2153 if (!blk_legacy_dinfo(blk)) {
2154 error_report("Deleting device added with blockdev-add"
2155 " is not supported");
2156 return;
2157 }
2158
2159 aio_context = bdrv_get_aio_context(bs);
2160 aio_context_acquire(aio_context);
2161
2162 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_DRIVE_DEL, &local_err)) {
2163 error_report_err(local_err);
2164 aio_context_release(aio_context);
2165 return;
2166 }
2167
2168 /* quiesce block driver; prevent further io */
2169 bdrv_drain_all();
2170 bdrv_flush(bs);
2171 bdrv_close(bs);
2172
2173 /* if we have a device attached to this BlockDriverState
2174 * then we need to make the drive anonymous until the device
2175 * can be removed. If this is a drive with no device backing
2176 * then we can just get rid of the block driver state right here.
2177 */
2178 if (blk_get_attached_dev(blk)) {
2179 blk_hide_on_behalf_of_hmp_drive_del(blk);
2180 /* Further I/O must not pause the guest */
2181 bdrv_set_on_error(bs, BLOCKDEV_ON_ERROR_REPORT,
2182 BLOCKDEV_ON_ERROR_REPORT);
2183 } else {
2184 blk_unref(blk);
2185 }
2186
2187 aio_context_release(aio_context);
2188 }
2189
2190 void qmp_block_resize(bool has_device, const char *device,
2191 bool has_node_name, const char *node_name,
2192 int64_t size, Error **errp)
2193 {
2194 Error *local_err = NULL;
2195 BlockDriverState *bs;
2196 AioContext *aio_context;
2197 int ret;
2198
2199 bs = bdrv_lookup_bs(has_device ? device : NULL,
2200 has_node_name ? node_name : NULL,
2201 &local_err);
2202 if (local_err) {
2203 error_propagate(errp, local_err);
2204 return;
2205 }
2206
2207 aio_context = bdrv_get_aio_context(bs);
2208 aio_context_acquire(aio_context);
2209
2210 if (!bdrv_is_first_non_filter(bs)) {
2211 error_setg(errp, QERR_FEATURE_DISABLED, "resize");
2212 goto out;
2213 }
2214
2215 if (size < 0) {
2216 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size");
2217 goto out;
2218 }
2219
2220 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_RESIZE, NULL)) {
2221 error_setg(errp, QERR_DEVICE_IN_USE, device);
2222 goto out;
2223 }
2224
2225 /* complete all in-flight operations before resizing the device */
2226 bdrv_drain_all();
2227
2228 ret = bdrv_truncate(bs, size);
2229 switch (ret) {
2230 case 0:
2231 break;
2232 case -ENOMEDIUM:
2233 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
2234 break;
2235 case -ENOTSUP:
2236 error_setg(errp, QERR_UNSUPPORTED);
2237 break;
2238 case -EACCES:
2239 error_setg(errp, "Device '%s' is read only", device);
2240 break;
2241 case -EBUSY:
2242 error_setg(errp, QERR_DEVICE_IN_USE, device);
2243 break;
2244 default:
2245 error_setg_errno(errp, -ret, "Could not resize");
2246 break;
2247 }
2248
2249 out:
2250 aio_context_release(aio_context);
2251 }
2252
2253 static void block_job_cb(void *opaque, int ret)
2254 {
2255 /* Note that this function may be executed from another AioContext besides
2256 * the QEMU main loop. If you need to access anything that assumes the
2257 * QEMU global mutex, use a BH or introduce a mutex.
2258 */
2259
2260 BlockDriverState *bs = opaque;
2261 const char *msg = NULL;
2262
2263 trace_block_job_cb(bs, bs->job, ret);
2264
2265 assert(bs->job);
2266
2267 if (ret < 0) {
2268 msg = strerror(-ret);
2269 }
2270
2271 if (block_job_is_cancelled(bs->job)) {
2272 block_job_event_cancelled(bs->job);
2273 } else {
2274 block_job_event_completed(bs->job, msg);
2275 }
2276
2277 bdrv_put_ref_bh_schedule(bs);
2278 }
2279
2280 void qmp_block_stream(const char *device,
2281 bool has_base, const char *base,
2282 bool has_backing_file, const char *backing_file,
2283 bool has_speed, int64_t speed,
2284 bool has_on_error, BlockdevOnError on_error,
2285 Error **errp)
2286 {
2287 BlockBackend *blk;
2288 BlockDriverState *bs;
2289 BlockDriverState *base_bs = NULL;
2290 AioContext *aio_context;
2291 Error *local_err = NULL;
2292 const char *base_name = NULL;
2293
2294 if (!has_on_error) {
2295 on_error = BLOCKDEV_ON_ERROR_REPORT;
2296 }
2297
2298 blk = blk_by_name(device);
2299 if (!blk) {
2300 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
2301 "Device '%s' not found", device);
2302 return;
2303 }
2304 bs = blk_bs(blk);
2305
2306 aio_context = bdrv_get_aio_context(bs);
2307 aio_context_acquire(aio_context);
2308
2309 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_STREAM, errp)) {
2310 goto out;
2311 }
2312
2313 if (has_base) {
2314 base_bs = bdrv_find_backing_image(bs, base);
2315 if (base_bs == NULL) {
2316 error_setg(errp, QERR_BASE_NOT_FOUND, base);
2317 goto out;
2318 }
2319 assert(bdrv_get_aio_context(base_bs) == aio_context);
2320 base_name = base;
2321 }
2322
2323 /* if we are streaming the entire chain, the result will have no backing
2324 * file, and specifying one is therefore an error */
2325 if (base_bs == NULL && has_backing_file) {
2326 error_setg(errp, "backing file specified, but streaming the "
2327 "entire chain");
2328 goto out;
2329 }
2330
2331 /* backing_file string overrides base bs filename */
2332 base_name = has_backing_file ? backing_file : base_name;
2333
2334 stream_start(bs, base_bs, base_name, has_speed ? speed : 0,
2335 on_error, block_job_cb, bs, &local_err);
2336 if (local_err) {
2337 error_propagate(errp, local_err);
2338 goto out;
2339 }
2340
2341 trace_qmp_block_stream(bs, bs->job);
2342
2343 out:
2344 aio_context_release(aio_context);
2345 }
2346
2347 void qmp_block_commit(const char *device,
2348 bool has_base, const char *base,
2349 bool has_top, const char *top,
2350 bool has_backing_file, const char *backing_file,
2351 bool has_speed, int64_t speed,
2352 Error **errp)
2353 {
2354 BlockBackend *blk;
2355 BlockDriverState *bs;
2356 BlockDriverState *base_bs, *top_bs;
2357 AioContext *aio_context;
2358 Error *local_err = NULL;
2359 /* This will be part of the QMP command, if/when the
2360 * BlockdevOnError change for blkmirror makes it in
2361 */
2362 BlockdevOnError on_error = BLOCKDEV_ON_ERROR_REPORT;
2363
2364 if (!has_speed) {
2365 speed = 0;
2366 }
2367
2368 /* Important Note:
2369 * libvirt relies on the DeviceNotFound error class in order to probe for
2370 * live commit feature versions; for this to work, we must make sure to
2371 * perform the device lookup before any generic errors that may occur in a
2372 * scenario in which all optional arguments are omitted. */
2373 blk = blk_by_name(device);
2374 if (!blk) {
2375 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
2376 "Device '%s' not found", device);
2377 return;
2378 }
2379 bs = blk_bs(blk);
2380
2381 aio_context = bdrv_get_aio_context(bs);
2382 aio_context_acquire(aio_context);
2383
2384 /* drain all i/o before commits */
2385 bdrv_drain_all();
2386
2387 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_COMMIT_SOURCE, errp)) {
2388 goto out;
2389 }
2390
2391 /* default top_bs is the active layer */
2392 top_bs = bs;
2393
2394 if (has_top && top) {
2395 if (strcmp(bs->filename, top) != 0) {
2396 top_bs = bdrv_find_backing_image(bs, top);
2397 }
2398 }
2399
2400 if (top_bs == NULL) {
2401 error_setg(errp, "Top image file %s not found", top ? top : "NULL");
2402 goto out;
2403 }
2404
2405 assert(bdrv_get_aio_context(top_bs) == aio_context);
2406
2407 if (has_base && base) {
2408 base_bs = bdrv_find_backing_image(top_bs, base);
2409 } else {
2410 base_bs = bdrv_find_base(top_bs);
2411 }
2412
2413 if (base_bs == NULL) {
2414 error_setg(errp, QERR_BASE_NOT_FOUND, base ? base : "NULL");
2415 goto out;
2416 }
2417
2418 assert(bdrv_get_aio_context(base_bs) == aio_context);
2419
2420 if (bdrv_op_is_blocked(base_bs, BLOCK_OP_TYPE_COMMIT_TARGET, errp)) {
2421 goto out;
2422 }
2423
2424 /* Do not allow attempts to commit an image into itself */
2425 if (top_bs == base_bs) {
2426 error_setg(errp, "cannot commit an image into itself");
2427 goto out;
2428 }
2429
2430 if (top_bs == bs) {
2431 if (has_backing_file) {
2432 error_setg(errp, "'backing-file' specified,"
2433 " but 'top' is the active layer");
2434 goto out;
2435 }
2436 commit_active_start(bs, base_bs, speed, on_error, block_job_cb,
2437 bs, &local_err);
2438 } else {
2439 commit_start(bs, base_bs, top_bs, speed, on_error, block_job_cb, bs,
2440 has_backing_file ? backing_file : NULL, &local_err);
2441 }
2442 if (local_err != NULL) {
2443 error_propagate(errp, local_err);
2444 goto out;
2445 }
2446
2447 out:
2448 aio_context_release(aio_context);
2449 }
2450
2451 void qmp_drive_backup(const char *device, const char *target,
2452 bool has_format, const char *format,
2453 enum MirrorSyncMode sync,
2454 bool has_mode, enum NewImageMode mode,
2455 bool has_speed, int64_t speed,
2456 bool has_bitmap, const char *bitmap,
2457 bool has_on_source_error, BlockdevOnError on_source_error,
2458 bool has_on_target_error, BlockdevOnError on_target_error,
2459 Error **errp)
2460 {
2461 BlockBackend *blk;
2462 BlockDriverState *bs;
2463 BlockDriverState *target_bs;
2464 BlockDriverState *source = NULL;
2465 BdrvDirtyBitmap *bmap = NULL;
2466 AioContext *aio_context;
2467 BlockDriver *drv = NULL;
2468 Error *local_err = NULL;
2469 int flags;
2470 int64_t size;
2471 int ret;
2472
2473 if (!has_speed) {
2474 speed = 0;
2475 }
2476 if (!has_on_source_error) {
2477 on_source_error = BLOCKDEV_ON_ERROR_REPORT;
2478 }
2479 if (!has_on_target_error) {
2480 on_target_error = BLOCKDEV_ON_ERROR_REPORT;
2481 }
2482 if (!has_mode) {
2483 mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
2484 }
2485
2486 blk = blk_by_name(device);
2487 if (!blk) {
2488 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
2489 "Device '%s' not found", device);
2490 return;
2491 }
2492 bs = blk_bs(blk);
2493
2494 aio_context = bdrv_get_aio_context(bs);
2495 aio_context_acquire(aio_context);
2496
2497 /* Although backup_run has this check too, we need to use bs->drv below, so
2498 * do an early check redundantly. */
2499 if (!bdrv_is_inserted(bs)) {
2500 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
2501 goto out;
2502 }
2503
2504 if (!has_format) {
2505 format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name;
2506 }
2507 if (format) {
2508 drv = bdrv_find_format(format);
2509 if (!drv) {
2510 error_setg(errp, QERR_INVALID_BLOCK_FORMAT, format);
2511 goto out;
2512 }
2513 }
2514
2515 /* Early check to avoid creating target */
2516 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_BACKUP_SOURCE, errp)) {
2517 goto out;
2518 }
2519
2520 flags = bs->open_flags | BDRV_O_RDWR;
2521
2522 /* See if we have a backing HD we can use to create our new image
2523 * on top of. */
2524 if (sync == MIRROR_SYNC_MODE_TOP) {
2525 source = bs->backing_hd;
2526 if (!source) {
2527 sync = MIRROR_SYNC_MODE_FULL;
2528 }
2529 }
2530 if (sync == MIRROR_SYNC_MODE_NONE) {
2531 source = bs;
2532 }
2533
2534 size = bdrv_getlength(bs);
2535 if (size < 0) {
2536 error_setg_errno(errp, -size, "bdrv_getlength failed");
2537 goto out;
2538 }
2539
2540 if (mode != NEW_IMAGE_MODE_EXISTING) {
2541 assert(format && drv);
2542 if (source) {
2543 bdrv_img_create(target, format, source->filename,
2544 source->drv->format_name, NULL,
2545 size, flags, &local_err, false);
2546 } else {
2547 bdrv_img_create(target, format, NULL, NULL, NULL,
2548 size, flags, &local_err, false);
2549 }
2550 }
2551
2552 if (local_err) {
2553 error_propagate(errp, local_err);
2554 goto out;
2555 }
2556
2557 target_bs = NULL;
2558 ret = bdrv_open(&target_bs, target, NULL, NULL, flags, drv, &local_err);
2559 if (ret < 0) {
2560 error_propagate(errp, local_err);
2561 goto out;
2562 }
2563
2564 bdrv_set_aio_context(target_bs, aio_context);
2565
2566 if (has_bitmap) {
2567 bmap = bdrv_find_dirty_bitmap(bs, bitmap);
2568 if (!bmap) {
2569 error_setg(errp, "Bitmap '%s' could not be found", bitmap);
2570 goto out;
2571 }
2572 }
2573
2574 backup_start(bs, target_bs, speed, sync, bmap,
2575 on_source_error, on_target_error,
2576 block_job_cb, bs, &local_err);
2577 if (local_err != NULL) {
2578 bdrv_unref(target_bs);
2579 error_propagate(errp, local_err);
2580 goto out;
2581 }
2582
2583 out:
2584 aio_context_release(aio_context);
2585 }
2586
2587 BlockDeviceInfoList *qmp_query_named_block_nodes(Error **errp)
2588 {
2589 return bdrv_named_nodes_list(errp);
2590 }
2591
2592 void qmp_blockdev_backup(const char *device, const char *target,
2593 enum MirrorSyncMode sync,
2594 bool has_speed, int64_t speed,
2595 bool has_on_source_error,
2596 BlockdevOnError on_source_error,
2597 bool has_on_target_error,
2598 BlockdevOnError on_target_error,
2599 Error **errp)
2600 {
2601 BlockBackend *blk;
2602 BlockDriverState *bs;
2603 BlockDriverState *target_bs;
2604 Error *local_err = NULL;
2605 AioContext *aio_context;
2606
2607 if (!has_speed) {
2608 speed = 0;
2609 }
2610 if (!has_on_source_error) {
2611 on_source_error = BLOCKDEV_ON_ERROR_REPORT;
2612 }
2613 if (!has_on_target_error) {
2614 on_target_error = BLOCKDEV_ON_ERROR_REPORT;
2615 }
2616
2617 blk = blk_by_name(device);
2618 if (!blk) {
2619 error_setg(errp, "Device '%s' not found", device);
2620 return;
2621 }
2622 bs = blk_bs(blk);
2623
2624 aio_context = bdrv_get_aio_context(bs);
2625 aio_context_acquire(aio_context);
2626
2627 blk = blk_by_name(target);
2628 if (!blk) {
2629 error_setg(errp, "Device '%s' not found", target);
2630 goto out;
2631 }
2632 target_bs = blk_bs(blk);
2633
2634 bdrv_ref(target_bs);
2635 bdrv_set_aio_context(target_bs, aio_context);
2636 backup_start(bs, target_bs, speed, sync, NULL, on_source_error,
2637 on_target_error, block_job_cb, bs, &local_err);
2638 if (local_err != NULL) {
2639 bdrv_unref(target_bs);
2640 error_propagate(errp, local_err);
2641 }
2642 out:
2643 aio_context_release(aio_context);
2644 }
2645
2646 #define DEFAULT_MIRROR_BUF_SIZE (10 << 20)
2647
2648 void qmp_drive_mirror(const char *device, const char *target,
2649 bool has_format, const char *format,
2650 bool has_node_name, const char *node_name,
2651 bool has_replaces, const char *replaces,
2652 enum MirrorSyncMode sync,
2653 bool has_mode, enum NewImageMode mode,
2654 bool has_speed, int64_t speed,
2655 bool has_granularity, uint32_t granularity,
2656 bool has_buf_size, int64_t buf_size,
2657 bool has_on_source_error, BlockdevOnError on_source_error,
2658 bool has_on_target_error, BlockdevOnError on_target_error,
2659 Error **errp)
2660 {
2661 BlockBackend *blk;
2662 BlockDriverState *bs;
2663 BlockDriverState *source, *target_bs;
2664 AioContext *aio_context;
2665 BlockDriver *drv = NULL;
2666 Error *local_err = NULL;
2667 QDict *options = NULL;
2668 int flags;
2669 int64_t size;
2670 int ret;
2671
2672 if (!has_speed) {
2673 speed = 0;
2674 }
2675 if (!has_on_source_error) {
2676 on_source_error = BLOCKDEV_ON_ERROR_REPORT;
2677 }
2678 if (!has_on_target_error) {
2679 on_target_error = BLOCKDEV_ON_ERROR_REPORT;
2680 }
2681 if (!has_mode) {
2682 mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
2683 }
2684 if (!has_granularity) {
2685 granularity = 0;
2686 }
2687 if (!has_buf_size) {
2688 buf_size = DEFAULT_MIRROR_BUF_SIZE;
2689 }
2690
2691 if (granularity != 0 && (granularity < 512 || granularity > 1048576 * 64)) {
2692 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity",
2693 "a value in range [512B, 64MB]");
2694 return;
2695 }
2696 if (granularity & (granularity - 1)) {
2697 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity",
2698 "power of 2");
2699 return;
2700 }
2701
2702 blk = blk_by_name(device);
2703 if (!blk) {
2704 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
2705 "Device '%s' not found", device);
2706 return;
2707 }
2708 bs = blk_bs(blk);
2709
2710 aio_context = bdrv_get_aio_context(bs);
2711 aio_context_acquire(aio_context);
2712
2713 if (!bdrv_is_inserted(bs)) {
2714 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
2715 goto out;
2716 }
2717
2718 if (!has_format) {
2719 format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name;
2720 }
2721 if (format) {
2722 drv = bdrv_find_format(format);
2723 if (!drv) {
2724 error_setg(errp, QERR_INVALID_BLOCK_FORMAT, format);
2725 goto out;
2726 }
2727 }
2728
2729 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_MIRROR, errp)) {
2730 goto out;
2731 }
2732
2733 flags = bs->open_flags | BDRV_O_RDWR;
2734 source = bs->backing_hd;
2735 if (!source && sync == MIRROR_SYNC_MODE_TOP) {
2736 sync = MIRROR_SYNC_MODE_FULL;
2737 }
2738 if (sync == MIRROR_SYNC_MODE_NONE) {
2739 source = bs;
2740 }
2741
2742 size = bdrv_getlength(bs);
2743 if (size < 0) {
2744 error_setg_errno(errp, -size, "bdrv_getlength failed");
2745 goto out;
2746 }
2747
2748 if (has_replaces) {
2749 BlockDriverState *to_replace_bs;
2750 AioContext *replace_aio_context;
2751 int64_t replace_size;
2752
2753 if (!has_node_name) {
2754 error_setg(errp, "a node-name must be provided when replacing a"
2755 " named node of the graph");
2756 goto out;
2757 }
2758
2759 to_replace_bs = check_to_replace_node(replaces, &local_err);
2760
2761 if (!to_replace_bs) {
2762 error_propagate(errp, local_err);
2763 goto out;
2764 }
2765
2766 replace_aio_context = bdrv_get_aio_context(to_replace_bs);
2767 aio_context_acquire(replace_aio_context);
2768 replace_size = bdrv_getlength(to_replace_bs);
2769 aio_context_release(replace_aio_context);
2770
2771 if (size != replace_size) {
2772 error_setg(errp, "cannot replace image with a mirror image of "
2773 "different size");
2774 goto out;
2775 }
2776 }
2777
2778 if ((sync == MIRROR_SYNC_MODE_FULL || !source)
2779 && mode != NEW_IMAGE_MODE_EXISTING)
2780 {
2781 /* create new image w/o backing file */
2782 assert(format && drv);
2783 bdrv_img_create(target, format,
2784 NULL, NULL, NULL, size, flags, &local_err, false);
2785 } else {
2786 switch (mode) {
2787 case NEW_IMAGE_MODE_EXISTING:
2788 break;
2789 case NEW_IMAGE_MODE_ABSOLUTE_PATHS:
2790 /* create new image with backing file */
2791 bdrv_img_create(target, format,
2792 source->filename,
2793 source->drv->format_name,
2794 NULL, size, flags, &local_err, false);
2795 break;
2796 default:
2797 abort();
2798 }
2799 }
2800
2801 if (local_err) {
2802 error_propagate(errp, local_err);
2803 goto out;
2804 }
2805
2806 if (has_node_name) {
2807 options = qdict_new();
2808 qdict_put(options, "node-name", qstring_from_str(node_name));
2809 }
2810
2811 /* Mirroring takes care of copy-on-write using the source's backing
2812 * file.
2813 */
2814 target_bs = NULL;
2815 ret = bdrv_open(&target_bs, target, NULL, options,
2816 flags | BDRV_O_NO_BACKING, drv, &local_err);
2817 if (ret < 0) {
2818 error_propagate(errp, local_err);
2819 goto out;
2820 }
2821
2822 bdrv_set_aio_context(target_bs, aio_context);
2823
2824 /* pass the node name to replace to mirror start since it's loose coupling
2825 * and will allow to check whether the node still exist at mirror completion
2826 */
2827 mirror_start(bs, target_bs,
2828 has_replaces ? replaces : NULL,
2829 speed, granularity, buf_size, sync,
2830 on_source_error, on_target_error,
2831 block_job_cb, bs, &local_err);
2832 if (local_err != NULL) {
2833 bdrv_unref(target_bs);
2834 error_propagate(errp, local_err);
2835 goto out;
2836 }
2837
2838 out:
2839 aio_context_release(aio_context);
2840 }
2841
2842 /* Get the block job for a given device name and acquire its AioContext */
2843 static BlockJob *find_block_job(const char *device, AioContext **aio_context,
2844 Error **errp)
2845 {
2846 BlockBackend *blk;
2847 BlockDriverState *bs;
2848
2849 blk = blk_by_name(device);
2850 if (!blk) {
2851 goto notfound;
2852 }
2853 bs = blk_bs(blk);
2854
2855 *aio_context = bdrv_get_aio_context(bs);
2856 aio_context_acquire(*aio_context);
2857
2858 if (!bs->job) {
2859 aio_context_release(*aio_context);
2860 goto notfound;
2861 }
2862
2863 return bs->job;
2864
2865 notfound:
2866 error_set(errp, ERROR_CLASS_DEVICE_NOT_ACTIVE,
2867 "No active block job on device '%s'", device);
2868 *aio_context = NULL;
2869 return NULL;
2870 }
2871
2872 void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp)
2873 {
2874 AioContext *aio_context;
2875 BlockJob *job = find_block_job(device, &aio_context, errp);
2876
2877 if (!job) {
2878 return;
2879 }
2880
2881 block_job_set_speed(job, speed, errp);
2882 aio_context_release(aio_context);
2883 }
2884
2885 void qmp_block_job_cancel(const char *device,
2886 bool has_force, bool force, Error **errp)
2887 {
2888 AioContext *aio_context;
2889 BlockJob *job = find_block_job(device, &aio_context, errp);
2890
2891 if (!job) {
2892 return;
2893 }
2894
2895 if (!has_force) {
2896 force = false;
2897 }
2898
2899 if (job->user_paused && !force) {
2900 error_setg(errp, "The block job for device '%s' is currently paused",
2901 device);
2902 goto out;
2903 }
2904
2905 trace_qmp_block_job_cancel(job);
2906 block_job_cancel(job);
2907 out:
2908 aio_context_release(aio_context);
2909 }
2910
2911 void qmp_block_job_pause(const char *device, Error **errp)
2912 {
2913 AioContext *aio_context;
2914 BlockJob *job = find_block_job(device, &aio_context, errp);
2915
2916 if (!job || job->user_paused) {
2917 return;
2918 }
2919
2920 job->user_paused = true;
2921 trace_qmp_block_job_pause(job);
2922 block_job_pause(job);
2923 aio_context_release(aio_context);
2924 }
2925
2926 void qmp_block_job_resume(const char *device, Error **errp)
2927 {
2928 AioContext *aio_context;
2929 BlockJob *job = find_block_job(device, &aio_context, errp);
2930
2931 if (!job || !job->user_paused) {
2932 return;
2933 }
2934
2935 job->user_paused = false;
2936 trace_qmp_block_job_resume(job);
2937 block_job_resume(job);
2938 aio_context_release(aio_context);
2939 }
2940
2941 void qmp_block_job_complete(const char *device, Error **errp)
2942 {
2943 AioContext *aio_context;
2944 BlockJob *job = find_block_job(device, &aio_context, errp);
2945
2946 if (!job) {
2947 return;
2948 }
2949
2950 trace_qmp_block_job_complete(job);
2951 block_job_complete(job, errp);
2952 aio_context_release(aio_context);
2953 }
2954
2955 void qmp_change_backing_file(const char *device,
2956 const char *image_node_name,
2957 const char *backing_file,
2958 Error **errp)
2959 {
2960 BlockBackend *blk;
2961 BlockDriverState *bs = NULL;
2962 AioContext *aio_context;
2963 BlockDriverState *image_bs = NULL;
2964 Error *local_err = NULL;
2965 bool ro;
2966 int open_flags;
2967 int ret;
2968
2969 blk = blk_by_name(device);
2970 if (!blk) {
2971 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
2972 "Device '%s' not found", device);
2973 return;
2974 }
2975 bs = blk_bs(blk);
2976
2977 aio_context = bdrv_get_aio_context(bs);
2978 aio_context_acquire(aio_context);
2979
2980 image_bs = bdrv_lookup_bs(NULL, image_node_name, &local_err);
2981 if (local_err) {
2982 error_propagate(errp, local_err);
2983 goto out;
2984 }
2985
2986 if (!image_bs) {
2987 error_setg(errp, "image file not found");
2988 goto out;
2989 }
2990
2991 if (bdrv_find_base(image_bs) == image_bs) {
2992 error_setg(errp, "not allowing backing file change on an image "
2993 "without a backing file");
2994 goto out;
2995 }
2996
2997 /* even though we are not necessarily operating on bs, we need it to
2998 * determine if block ops are currently prohibited on the chain */
2999 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_CHANGE, errp)) {
3000 goto out;
3001 }
3002
3003 /* final sanity check */
3004 if (!bdrv_chain_contains(bs, image_bs)) {
3005 error_setg(errp, "'%s' and image file are not in the same chain",
3006 device);
3007 goto out;
3008 }
3009
3010 /* if not r/w, reopen to make r/w */
3011 open_flags = image_bs->open_flags;
3012 ro = bdrv_is_read_only(image_bs);
3013
3014 if (ro) {
3015 bdrv_reopen(image_bs, open_flags | BDRV_O_RDWR, &local_err);
3016 if (local_err) {
3017 error_propagate(errp, local_err);
3018 goto out;
3019 }
3020 }
3021
3022 ret = bdrv_change_backing_file(image_bs, backing_file,
3023 image_bs->drv ? image_bs->drv->format_name : "");
3024
3025 if (ret < 0) {
3026 error_setg_errno(errp, -ret, "Could not change backing file to '%s'",
3027 backing_file);
3028 /* don't exit here, so we can try to restore open flags if
3029 * appropriate */
3030 }
3031
3032 if (ro) {
3033 bdrv_reopen(image_bs, open_flags, &local_err);
3034 if (local_err) {
3035 error_propagate(errp, local_err); /* will preserve prior errp */
3036 }
3037 }
3038
3039 out:
3040 aio_context_release(aio_context);
3041 }
3042
3043 void qmp_blockdev_add(BlockdevOptions *options, Error **errp)
3044 {
3045 QmpOutputVisitor *ov = qmp_output_visitor_new();
3046 BlockBackend *blk;
3047 QObject *obj;
3048 QDict *qdict;
3049 Error *local_err = NULL;
3050
3051 /* Require an ID in the top level */
3052 if (!options->has_id) {
3053 error_setg(errp, "Block device needs an ID");
3054 goto fail;
3055 }
3056
3057 /* TODO Sort it out in raw-posix and drive_new(): Reject aio=native with
3058 * cache.direct=false instead of silently switching to aio=threads, except
3059 * when called from drive_new().
3060 *
3061 * For now, simply forbidding the combination for all drivers will do. */
3062 if (options->has_aio && options->aio == BLOCKDEV_AIO_OPTIONS_NATIVE) {
3063 bool direct = options->has_cache &&
3064 options->cache->has_direct &&
3065 options->cache->direct;
3066 if (!direct) {
3067 error_setg(errp, "aio=native requires cache.direct=true");
3068 goto fail;
3069 }
3070 }
3071
3072 visit_type_BlockdevOptions(qmp_output_get_visitor(ov),
3073 &options, NULL, &local_err);
3074 if (local_err) {
3075 error_propagate(errp, local_err);
3076 goto fail;
3077 }
3078
3079 obj = qmp_output_get_qobject(ov);
3080 qdict = qobject_to_qdict(obj);
3081
3082 qdict_flatten(qdict);
3083
3084 blk = blockdev_init(NULL, qdict, &local_err);
3085 if (local_err) {
3086 error_propagate(errp, local_err);
3087 goto fail;
3088 }
3089
3090 if (bdrv_key_required(blk_bs(blk))) {
3091 blk_unref(blk);
3092 error_setg(errp, "blockdev-add doesn't support encrypted devices");
3093 goto fail;
3094 }
3095
3096 fail:
3097 qmp_output_visitor_cleanup(ov);
3098 }
3099
3100 BlockJobInfoList *qmp_query_block_jobs(Error **errp)
3101 {
3102 BlockJobInfoList *head = NULL, **p_next = &head;
3103 BlockDriverState *bs;
3104
3105 for (bs = bdrv_next(NULL); bs; bs = bdrv_next(bs)) {
3106 AioContext *aio_context = bdrv_get_aio_context(bs);
3107
3108 aio_context_acquire(aio_context);
3109
3110 if (bs->job) {
3111 BlockJobInfoList *elem = g_new0(BlockJobInfoList, 1);
3112 elem->value = block_job_query(bs->job);
3113 *p_next = elem;
3114 p_next = &elem->next;
3115 }
3116
3117 aio_context_release(aio_context);
3118 }
3119
3120 return head;
3121 }
3122
3123 QemuOptsList qemu_common_drive_opts = {
3124 .name = "drive",
3125 .head = QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts.head),
3126 .desc = {
3127 {
3128 .name = "snapshot",
3129 .type = QEMU_OPT_BOOL,
3130 .help = "enable/disable snapshot mode",
3131 },{
3132 .name = "discard",
3133 .type = QEMU_OPT_STRING,
3134 .help = "discard operation (ignore/off, unmap/on)",
3135 },{
3136 .name = BDRV_OPT_CACHE_WB,
3137 .type = QEMU_OPT_BOOL,
3138 .help = "enables writeback mode for any caches",
3139 },{
3140 .name = BDRV_OPT_CACHE_DIRECT,
3141 .type = QEMU_OPT_BOOL,
3142 .help = "enables use of O_DIRECT (bypass the host page cache)",
3143 },{
3144 .name = BDRV_OPT_CACHE_NO_FLUSH,
3145 .type = QEMU_OPT_BOOL,
3146 .help = "ignore any flush requests for the device",
3147 },{
3148 .name = "aio",
3149 .type = QEMU_OPT_STRING,
3150 .help = "host AIO implementation (threads, native)",
3151 },{
3152 .name = "format",
3153 .type = QEMU_OPT_STRING,
3154 .help = "disk format (raw, qcow2, ...)",
3155 },{
3156 .name = "rerror",
3157 .type = QEMU_OPT_STRING,
3158 .help = "read error action",
3159 },{
3160 .name = "werror",
3161 .type = QEMU_OPT_STRING,
3162 .help = "write error action",
3163 },{
3164 .name = "read-only",
3165 .type = QEMU_OPT_BOOL,
3166 .help = "open drive file as read-only",
3167 },{
3168 .name = "throttling.iops-total",
3169 .type = QEMU_OPT_NUMBER,
3170 .help = "limit total I/O operations per second",
3171 },{
3172 .name = "throttling.iops-read",
3173 .type = QEMU_OPT_NUMBER,
3174 .help = "limit read operations per second",
3175 },{
3176 .name = "throttling.iops-write",
3177 .type = QEMU_OPT_NUMBER,
3178 .help = "limit write operations per second",
3179 },{
3180 .name = "throttling.bps-total",
3181 .type = QEMU_OPT_NUMBER,
3182 .help = "limit total bytes per second",
3183 },{
3184 .name = "throttling.bps-read",
3185 .type = QEMU_OPT_NUMBER,
3186 .help = "limit read bytes per second",
3187 },{
3188 .name = "throttling.bps-write",
3189 .type = QEMU_OPT_NUMBER,
3190 .help = "limit write bytes per second",
3191 },{
3192 .name = "throttling.iops-total-max",
3193 .type = QEMU_OPT_NUMBER,
3194 .help = "I/O operations burst",
3195 },{
3196 .name = "throttling.iops-read-max",
3197 .type = QEMU_OPT_NUMBER,
3198 .help = "I/O operations read burst",
3199 },{
3200 .name = "throttling.iops-write-max",
3201 .type = QEMU_OPT_NUMBER,
3202 .help = "I/O operations write burst",
3203 },{
3204 .name = "throttling.bps-total-max",
3205 .type = QEMU_OPT_NUMBER,
3206 .help = "total bytes burst",
3207 },{
3208 .name = "throttling.bps-read-max",
3209 .type = QEMU_OPT_NUMBER,
3210 .help = "total bytes read burst",
3211 },{
3212 .name = "throttling.bps-write-max",
3213 .type = QEMU_OPT_NUMBER,
3214 .help = "total bytes write burst",
3215 },{
3216 .name = "throttling.iops-size",
3217 .type = QEMU_OPT_NUMBER,
3218 .help = "when limiting by iops max size of an I/O in bytes",
3219 },{
3220 .name = "throttling.group",
3221 .type = QEMU_OPT_STRING,
3222 .help = "name of the block throttling group",
3223 },{
3224 .name = "copy-on-read",
3225 .type = QEMU_OPT_BOOL,
3226 .help = "copy read data from backing file into image file",
3227 },{
3228 .name = "detect-zeroes",
3229 .type = QEMU_OPT_STRING,
3230 .help = "try to optimize zero writes (off, on, unmap)",
3231 },
3232 { /* end of list */ }
3233 },
3234 };
3235
3236 QemuOptsList qemu_drive_opts = {
3237 .name = "drive",
3238 .head = QTAILQ_HEAD_INITIALIZER(qemu_drive_opts.head),
3239 .desc = {
3240 /*
3241 * no elements => accept any params
3242 * validation will happen later
3243 */
3244 { /* end of list */ }
3245 },
3246 };
AR7 emulation for QEMU