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arm: Refactor get_phys_addr FSR return mechanism
[qemu/ar7.git] / blockdev.c
blob3aa1ae66981afb4dca2f87bf3e66b0ccc10fff79
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(qemu_find_opts("drive"), optstr, 0);
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-s390", &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, QERR_DEVICE_NOT_FOUND, device);
1115 return NULL;
1116 }
1117 bs = blk_bs(blk);
1118
1119 if (!has_id) {
1120 id = NULL;
1121 }
1122
1123 if (!has_name) {
1124 name = NULL;
1125 }
1126
1127 if (!id && !name) {
1128 error_setg(errp, "Name or id must be provided");
1129 return NULL;
1130 }
1131
1132 aio_context = bdrv_get_aio_context(bs);
1133 aio_context_acquire(aio_context);
1134
1135 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT_DELETE, errp)) {
1136 goto out_aio_context;
1137 }
1138
1139 ret = bdrv_snapshot_find_by_id_and_name(bs, id, name, &sn, &local_err);
1140 if (local_err) {
1141 error_propagate(errp, local_err);
1142 goto out_aio_context;
1143 }
1144 if (!ret) {
1145 error_setg(errp,
1146 "Snapshot with id '%s' and name '%s' does not exist on "
1147 "device '%s'",
1148 STR_OR_NULL(id), STR_OR_NULL(name), device);
1149 goto out_aio_context;
1150 }
1151
1152 bdrv_snapshot_delete(bs, id, name, &local_err);
1153 if (local_err) {
1154 error_propagate(errp, local_err);
1155 goto out_aio_context;
1156 }
1157
1158 aio_context_release(aio_context);
1159
1160 info = g_new0(SnapshotInfo, 1);
1161 info->id = g_strdup(sn.id_str);
1162 info->name = g_strdup(sn.name);
1163 info->date_nsec = sn.date_nsec;
1164 info->date_sec = sn.date_sec;
1165 info->vm_state_size = sn.vm_state_size;
1166 info->vm_clock_nsec = sn.vm_clock_nsec % 1000000000;
1167 info->vm_clock_sec = sn.vm_clock_nsec / 1000000000;
1168
1169 return info;
1170
1171 out_aio_context:
1172 aio_context_release(aio_context);
1173 return NULL;
1174 }
1175
1176 /**
1177 * block_dirty_bitmap_lookup:
1178 * Return a dirty bitmap (if present), after validating
1179 * the node reference and bitmap names.
1180 *
1181 * @node: The name of the BDS node to search for bitmaps
1182 * @name: The name of the bitmap to search for
1183 * @pbs: Output pointer for BDS lookup, if desired. Can be NULL.
1184 * @paio: Output pointer for aio_context acquisition, if desired. Can be NULL.
1185 * @errp: Output pointer for error information. Can be NULL.
1186 *
1187 * @return: A bitmap object on success, or NULL on failure.
1188 */
1189 static BdrvDirtyBitmap *block_dirty_bitmap_lookup(const char *node,
1190 const char *name,
1191 BlockDriverState **pbs,
1192 AioContext **paio,
1193 Error **errp)
1194 {
1195 BlockDriverState *bs;
1196 BdrvDirtyBitmap *bitmap;
1197 AioContext *aio_context;
1198
1199 if (!node) {
1200 error_setg(errp, "Node cannot be NULL");
1201 return NULL;
1202 }
1203 if (!name) {
1204 error_setg(errp, "Bitmap name cannot be NULL");
1205 return NULL;
1206 }
1207 bs = bdrv_lookup_bs(node, node, NULL);
1208 if (!bs) {
1209 error_setg(errp, "Node '%s' not found", node);
1210 return NULL;
1211 }
1212
1213 aio_context = bdrv_get_aio_context(bs);
1214 aio_context_acquire(aio_context);
1215
1216 bitmap = bdrv_find_dirty_bitmap(bs, name);
1217 if (!bitmap) {
1218 error_setg(errp, "Dirty bitmap '%s' not found", name);
1219 goto fail;
1220 }
1221
1222 if (pbs) {
1223 *pbs = bs;
1224 }
1225 if (paio) {
1226 *paio = aio_context;
1227 } else {
1228 aio_context_release(aio_context);
1229 }
1230
1231 return bitmap;
1232
1233 fail:
1234 aio_context_release(aio_context);
1235 return NULL;
1236 }
1237
1238 /* New and old BlockDriverState structs for atomic group operations */
1239
1240 typedef struct BlkTransactionState BlkTransactionState;
1241
1242 /* Only prepare() may fail. In a single transaction, only one of commit() or
1243 abort() will be called, clean() will always be called if it present. */
1244 typedef struct BdrvActionOps {
1245 /* Size of state struct, in bytes. */
1246 size_t instance_size;
1247 /* Prepare the work, must NOT be NULL. */
1248 void (*prepare)(BlkTransactionState *common, Error **errp);
1249 /* Commit the changes, can be NULL. */
1250 void (*commit)(BlkTransactionState *common);
1251 /* Abort the changes on fail, can be NULL. */
1252 void (*abort)(BlkTransactionState *common);
1253 /* Clean up resource in the end, can be NULL. */
1254 void (*clean)(BlkTransactionState *common);
1255 } BdrvActionOps;
1256
1257 /*
1258 * This structure must be arranged as first member in child type, assuming
1259 * that compiler will also arrange it to the same address with parent instance.
1260 * Later it will be used in free().
1261 */
1262 struct BlkTransactionState {
1263 TransactionAction *action;
1264 const BdrvActionOps *ops;
1265 QSIMPLEQ_ENTRY(BlkTransactionState) entry;
1266 };
1267
1268 /* internal snapshot private data */
1269 typedef struct InternalSnapshotState {
1270 BlkTransactionState common;
1271 BlockDriverState *bs;
1272 AioContext *aio_context;
1273 QEMUSnapshotInfo sn;
1274 } InternalSnapshotState;
1275
1276 static void internal_snapshot_prepare(BlkTransactionState *common,
1277 Error **errp)
1278 {
1279 Error *local_err = NULL;
1280 const char *device;
1281 const char *name;
1282 BlockBackend *blk;
1283 BlockDriverState *bs;
1284 QEMUSnapshotInfo old_sn, *sn;
1285 bool ret;
1286 qemu_timeval tv;
1287 BlockdevSnapshotInternal *internal;
1288 InternalSnapshotState *state;
1289 int ret1;
1290
1291 g_assert(common->action->kind ==
1292 TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC);
1293 internal = common->action->blockdev_snapshot_internal_sync;
1294 state = DO_UPCAST(InternalSnapshotState, common, common);
1295
1296 /* 1. parse input */
1297 device = internal->device;
1298 name = internal->name;
1299
1300 /* 2. check for validation */
1301 blk = blk_by_name(device);
1302 if (!blk) {
1303 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1304 return;
1305 }
1306 bs = blk_bs(blk);
1307
1308 /* AioContext is released in .clean() */
1309 state->aio_context = bdrv_get_aio_context(bs);
1310 aio_context_acquire(state->aio_context);
1311
1312 if (!bdrv_is_inserted(bs)) {
1313 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1314 return;
1315 }
1316
1317 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT, errp)) {
1318 return;
1319 }
1320
1321 if (bdrv_is_read_only(bs)) {
1322 error_setg(errp, "Device '%s' is read only", device);
1323 return;
1324 }
1325
1326 if (!bdrv_can_snapshot(bs)) {
1327 error_setg(errp, "Block format '%s' used by device '%s' "
1328 "does not support internal snapshots",
1329 bs->drv->format_name, device);
1330 return;
1331 }
1332
1333 if (!strlen(name)) {
1334 error_setg(errp, "Name is empty");
1335 return;
1336 }
1337
1338 /* check whether a snapshot with name exist */
1339 ret = bdrv_snapshot_find_by_id_and_name(bs, NULL, name, &old_sn,
1340 &local_err);
1341 if (local_err) {
1342 error_propagate(errp, local_err);
1343 return;
1344 } else if (ret) {
1345 error_setg(errp,
1346 "Snapshot with name '%s' already exists on device '%s'",
1347 name, device);
1348 return;
1349 }
1350
1351 /* 3. take the snapshot */
1352 sn = &state->sn;
1353 pstrcpy(sn->name, sizeof(sn->name), name);
1354 qemu_gettimeofday(&tv);
1355 sn->date_sec = tv.tv_sec;
1356 sn->date_nsec = tv.tv_usec * 1000;
1357 sn->vm_clock_nsec = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
1358
1359 ret1 = bdrv_snapshot_create(bs, sn);
1360 if (ret1 < 0) {
1361 error_setg_errno(errp, -ret1,
1362 "Failed to create snapshot '%s' on device '%s'",
1363 name, device);
1364 return;
1365 }
1366
1367 /* 4. succeed, mark a snapshot is created */
1368 state->bs = bs;
1369 }
1370
1371 static void internal_snapshot_abort(BlkTransactionState *common)
1372 {
1373 InternalSnapshotState *state =
1374 DO_UPCAST(InternalSnapshotState, common, common);
1375 BlockDriverState *bs = state->bs;
1376 QEMUSnapshotInfo *sn = &state->sn;
1377 Error *local_error = NULL;
1378
1379 if (!bs) {
1380 return;
1381 }
1382
1383 if (bdrv_snapshot_delete(bs, sn->id_str, sn->name, &local_error) < 0) {
1384 error_report("Failed to delete snapshot with id '%s' and name '%s' on "
1385 "device '%s' in abort: %s",
1386 sn->id_str,
1387 sn->name,
1388 bdrv_get_device_name(bs),
1389 error_get_pretty(local_error));
1390 error_free(local_error);
1391 }
1392 }
1393
1394 static void internal_snapshot_clean(BlkTransactionState *common)
1395 {
1396 InternalSnapshotState *state = DO_UPCAST(InternalSnapshotState,
1397 common, common);
1398
1399 if (state->aio_context) {
1400 aio_context_release(state->aio_context);
1401 }
1402 }
1403
1404 /* external snapshot private data */
1405 typedef struct ExternalSnapshotState {
1406 BlkTransactionState common;
1407 BlockDriverState *old_bs;
1408 BlockDriverState *new_bs;
1409 AioContext *aio_context;
1410 } ExternalSnapshotState;
1411
1412 static void external_snapshot_prepare(BlkTransactionState *common,
1413 Error **errp)
1414 {
1415 BlockDriver *drv;
1416 int flags, ret;
1417 QDict *options = NULL;
1418 Error *local_err = NULL;
1419 bool has_device = false;
1420 const char *device;
1421 bool has_node_name = false;
1422 const char *node_name;
1423 bool has_snapshot_node_name = false;
1424 const char *snapshot_node_name;
1425 const char *new_image_file;
1426 const char *format = "qcow2";
1427 enum NewImageMode mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
1428 ExternalSnapshotState *state =
1429 DO_UPCAST(ExternalSnapshotState, common, common);
1430 TransactionAction *action = common->action;
1431
1432 /* get parameters */
1433 g_assert(action->kind == TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC);
1434
1435 has_device = action->blockdev_snapshot_sync->has_device;
1436 device = action->blockdev_snapshot_sync->device;
1437 has_node_name = action->blockdev_snapshot_sync->has_node_name;
1438 node_name = action->blockdev_snapshot_sync->node_name;
1439 has_snapshot_node_name =
1440 action->blockdev_snapshot_sync->has_snapshot_node_name;
1441 snapshot_node_name = action->blockdev_snapshot_sync->snapshot_node_name;
1442
1443 new_image_file = action->blockdev_snapshot_sync->snapshot_file;
1444 if (action->blockdev_snapshot_sync->has_format) {
1445 format = action->blockdev_snapshot_sync->format;
1446 }
1447 if (action->blockdev_snapshot_sync->has_mode) {
1448 mode = action->blockdev_snapshot_sync->mode;
1449 }
1450
1451 /* start processing */
1452 drv = bdrv_find_format(format);
1453 if (!drv) {
1454 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
1455 return;
1456 }
1457
1458 state->old_bs = bdrv_lookup_bs(has_device ? device : NULL,
1459 has_node_name ? node_name : NULL,
1460 &local_err);
1461 if (local_err) {
1462 error_propagate(errp, local_err);
1463 return;
1464 }
1465
1466 if (has_node_name && !has_snapshot_node_name) {
1467 error_setg(errp, "New snapshot node name missing");
1468 return;
1469 }
1470
1471 if (has_snapshot_node_name && bdrv_find_node(snapshot_node_name)) {
1472 error_setg(errp, "New snapshot node name already existing");
1473 return;
1474 }
1475
1476 /* Acquire AioContext now so any threads operating on old_bs stop */
1477 state->aio_context = bdrv_get_aio_context(state->old_bs);
1478 aio_context_acquire(state->aio_context);
1479
1480 if (!bdrv_is_inserted(state->old_bs)) {
1481 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1482 return;
1483 }
1484
1485 if (bdrv_op_is_blocked(state->old_bs,
1486 BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT, errp)) {
1487 return;
1488 }
1489
1490 if (!bdrv_is_read_only(state->old_bs)) {
1491 if (bdrv_flush(state->old_bs)) {
1492 error_set(errp, QERR_IO_ERROR);
1493 return;
1494 }
1495 }
1496
1497 if (!bdrv_is_first_non_filter(state->old_bs)) {
1498 error_set(errp, QERR_FEATURE_DISABLED, "snapshot");
1499 return;
1500 }
1501
1502 flags = state->old_bs->open_flags;
1503
1504 /* create new image w/backing file */
1505 if (mode != NEW_IMAGE_MODE_EXISTING) {
1506 bdrv_img_create(new_image_file, format,
1507 state->old_bs->filename,
1508 state->old_bs->drv->format_name,
1509 NULL, -1, flags, &local_err, false);
1510 if (local_err) {
1511 error_propagate(errp, local_err);
1512 return;
1513 }
1514 }
1515
1516 if (has_snapshot_node_name) {
1517 options = qdict_new();
1518 qdict_put(options, "node-name",
1519 qstring_from_str(snapshot_node_name));
1520 }
1521
1522 /* TODO Inherit bs->options or only take explicit options with an
1523 * extended QMP command? */
1524 assert(state->new_bs == NULL);
1525 ret = bdrv_open(&state->new_bs, new_image_file, NULL, options,
1526 flags | BDRV_O_NO_BACKING, drv, &local_err);
1527 /* We will manually add the backing_hd field to the bs later */
1528 if (ret != 0) {
1529 error_propagate(errp, local_err);
1530 }
1531 }
1532
1533 static void external_snapshot_commit(BlkTransactionState *common)
1534 {
1535 ExternalSnapshotState *state =
1536 DO_UPCAST(ExternalSnapshotState, common, common);
1537
1538 bdrv_set_aio_context(state->new_bs, state->aio_context);
1539
1540 /* This removes our old bs and adds the new bs */
1541 bdrv_append(state->new_bs, state->old_bs);
1542 /* We don't need (or want) to use the transactional
1543 * bdrv_reopen_multiple() across all the entries at once, because we
1544 * don't want to abort all of them if one of them fails the reopen */
1545 bdrv_reopen(state->new_bs, state->new_bs->open_flags & ~BDRV_O_RDWR,
1546 NULL);
1547
1548 aio_context_release(state->aio_context);
1549 }
1550
1551 static void external_snapshot_abort(BlkTransactionState *common)
1552 {
1553 ExternalSnapshotState *state =
1554 DO_UPCAST(ExternalSnapshotState, common, common);
1555 if (state->new_bs) {
1556 bdrv_unref(state->new_bs);
1557 }
1558 if (state->aio_context) {
1559 aio_context_release(state->aio_context);
1560 }
1561 }
1562
1563 typedef struct DriveBackupState {
1564 BlkTransactionState common;
1565 BlockDriverState *bs;
1566 AioContext *aio_context;
1567 BlockJob *job;
1568 } DriveBackupState;
1569
1570 static void drive_backup_prepare(BlkTransactionState *common, Error **errp)
1571 {
1572 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1573 BlockDriverState *bs;
1574 BlockBackend *blk;
1575 DriveBackup *backup;
1576 Error *local_err = NULL;
1577
1578 assert(common->action->kind == TRANSACTION_ACTION_KIND_DRIVE_BACKUP);
1579 backup = common->action->drive_backup;
1580
1581 blk = blk_by_name(backup->device);
1582 if (!blk) {
1583 error_set(errp, QERR_DEVICE_NOT_FOUND, backup->device);
1584 return;
1585 }
1586 bs = blk_bs(blk);
1587
1588 /* AioContext is released in .clean() */
1589 state->aio_context = bdrv_get_aio_context(bs);
1590 aio_context_acquire(state->aio_context);
1591
1592 qmp_drive_backup(backup->device, backup->target,
1593 backup->has_format, backup->format,
1594 backup->sync,
1595 backup->has_mode, backup->mode,
1596 backup->has_speed, backup->speed,
1597 backup->has_bitmap, backup->bitmap,
1598 backup->has_on_source_error, backup->on_source_error,
1599 backup->has_on_target_error, backup->on_target_error,
1600 &local_err);
1601 if (local_err) {
1602 error_propagate(errp, local_err);
1603 return;
1604 }
1605
1606 state->bs = bs;
1607 state->job = state->bs->job;
1608 }
1609
1610 static void drive_backup_abort(BlkTransactionState *common)
1611 {
1612 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1613 BlockDriverState *bs = state->bs;
1614
1615 /* Only cancel if it's the job we started */
1616 if (bs && bs->job && bs->job == state->job) {
1617 block_job_cancel_sync(bs->job);
1618 }
1619 }
1620
1621 static void drive_backup_clean(BlkTransactionState *common)
1622 {
1623 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1624
1625 if (state->aio_context) {
1626 aio_context_release(state->aio_context);
1627 }
1628 }
1629
1630 typedef struct BlockdevBackupState {
1631 BlkTransactionState common;
1632 BlockDriverState *bs;
1633 BlockJob *job;
1634 AioContext *aio_context;
1635 } BlockdevBackupState;
1636
1637 static void blockdev_backup_prepare(BlkTransactionState *common, Error **errp)
1638 {
1639 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
1640 BlockdevBackup *backup;
1641 BlockDriverState *bs, *target;
1642 BlockBackend *blk;
1643 Error *local_err = NULL;
1644
1645 assert(common->action->kind == TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP);
1646 backup = common->action->blockdev_backup;
1647
1648 blk = blk_by_name(backup->device);
1649 if (!blk) {
1650 error_setg(errp, "Device '%s' not found", backup->device);
1651 return;
1652 }
1653 bs = blk_bs(blk);
1654
1655 blk = blk_by_name(backup->target);
1656 if (!blk) {
1657 error_setg(errp, "Device '%s' not found", backup->target);
1658 return;
1659 }
1660 target = blk_bs(blk);
1661
1662 /* AioContext is released in .clean() */
1663 state->aio_context = bdrv_get_aio_context(bs);
1664 if (state->aio_context != bdrv_get_aio_context(target)) {
1665 state->aio_context = NULL;
1666 error_setg(errp, "Backup between two IO threads is not implemented");
1667 return;
1668 }
1669 aio_context_acquire(state->aio_context);
1670
1671 qmp_blockdev_backup(backup->device, backup->target,
1672 backup->sync,
1673 backup->has_speed, backup->speed,
1674 backup->has_on_source_error, backup->on_source_error,
1675 backup->has_on_target_error, backup->on_target_error,
1676 &local_err);
1677 if (local_err) {
1678 error_propagate(errp, local_err);
1679 return;
1680 }
1681
1682 state->bs = bs;
1683 state->job = state->bs->job;
1684 }
1685
1686 static void blockdev_backup_abort(BlkTransactionState *common)
1687 {
1688 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
1689 BlockDriverState *bs = state->bs;
1690
1691 /* Only cancel if it's the job we started */
1692 if (bs && bs->job && bs->job == state->job) {
1693 block_job_cancel_sync(bs->job);
1694 }
1695 }
1696
1697 static void blockdev_backup_clean(BlkTransactionState *common)
1698 {
1699 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
1700
1701 if (state->aio_context) {
1702 aio_context_release(state->aio_context);
1703 }
1704 }
1705
1706 static void abort_prepare(BlkTransactionState *common, Error **errp)
1707 {
1708 error_setg(errp, "Transaction aborted using Abort action");
1709 }
1710
1711 static void abort_commit(BlkTransactionState *common)
1712 {
1713 g_assert_not_reached(); /* this action never succeeds */
1714 }
1715
1716 static const BdrvActionOps actions[] = {
1717 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC] = {
1718 .instance_size = sizeof(ExternalSnapshotState),
1719 .prepare = external_snapshot_prepare,
1720 .commit = external_snapshot_commit,
1721 .abort = external_snapshot_abort,
1722 },
1723 [TRANSACTION_ACTION_KIND_DRIVE_BACKUP] = {
1724 .instance_size = sizeof(DriveBackupState),
1725 .prepare = drive_backup_prepare,
1726 .abort = drive_backup_abort,
1727 .clean = drive_backup_clean,
1728 },
1729 [TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP] = {
1730 .instance_size = sizeof(BlockdevBackupState),
1731 .prepare = blockdev_backup_prepare,
1732 .abort = blockdev_backup_abort,
1733 .clean = blockdev_backup_clean,
1734 },
1735 [TRANSACTION_ACTION_KIND_ABORT] = {
1736 .instance_size = sizeof(BlkTransactionState),
1737 .prepare = abort_prepare,
1738 .commit = abort_commit,
1739 },
1740 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC] = {
1741 .instance_size = sizeof(InternalSnapshotState),
1742 .prepare = internal_snapshot_prepare,
1743 .abort = internal_snapshot_abort,
1744 .clean = internal_snapshot_clean,
1745 },
1746 };
1747
1748 /*
1749 * 'Atomic' group operations. The operations are performed as a set, and if
1750 * any fail then we roll back all operations in the group.
1751 */
1752 void qmp_transaction(TransactionActionList *dev_list, Error **errp)
1753 {
1754 TransactionActionList *dev_entry = dev_list;
1755 BlkTransactionState *state, *next;
1756 Error *local_err = NULL;
1757
1758 QSIMPLEQ_HEAD(snap_bdrv_states, BlkTransactionState) snap_bdrv_states;
1759 QSIMPLEQ_INIT(&snap_bdrv_states);
1760
1761 /* drain all i/o before any operations */
1762 bdrv_drain_all();
1763
1764 /* We don't do anything in this loop that commits us to the operations */
1765 while (NULL != dev_entry) {
1766 TransactionAction *dev_info = NULL;
1767 const BdrvActionOps *ops;
1768
1769 dev_info = dev_entry->value;
1770 dev_entry = dev_entry->next;
1771
1772 assert(dev_info->kind < ARRAY_SIZE(actions));
1773
1774 ops = &actions[dev_info->kind];
1775 assert(ops->instance_size > 0);
1776
1777 state = g_malloc0(ops->instance_size);
1778 state->ops = ops;
1779 state->action = dev_info;
1780 QSIMPLEQ_INSERT_TAIL(&snap_bdrv_states, state, entry);
1781
1782 state->ops->prepare(state, &local_err);
1783 if (local_err) {
1784 error_propagate(errp, local_err);
1785 goto delete_and_fail;
1786 }
1787 }
1788
1789 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) {
1790 if (state->ops->commit) {
1791 state->ops->commit(state);
1792 }
1793 }
1794
1795 /* success */
1796 goto exit;
1797
1798 delete_and_fail:
1799 /* failure, and it is all-or-none; roll back all operations */
1800 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) {
1801 if (state->ops->abort) {
1802 state->ops->abort(state);
1803 }
1804 }
1805 exit:
1806 QSIMPLEQ_FOREACH_SAFE(state, &snap_bdrv_states, entry, next) {
1807 if (state->ops->clean) {
1808 state->ops->clean(state);
1809 }
1810 g_free(state);
1811 }
1812 }
1813
1814
1815 static void eject_device(BlockBackend *blk, int force, Error **errp)
1816 {
1817 BlockDriverState *bs = blk_bs(blk);
1818 AioContext *aio_context;
1819
1820 aio_context = bdrv_get_aio_context(bs);
1821 aio_context_acquire(aio_context);
1822
1823 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_EJECT, errp)) {
1824 goto out;
1825 }
1826 if (!blk_dev_has_removable_media(blk)) {
1827 error_setg(errp, "Device '%s' is not removable",
1828 bdrv_get_device_name(bs));
1829 goto out;
1830 }
1831
1832 if (blk_dev_is_medium_locked(blk) && !blk_dev_is_tray_open(blk)) {
1833 blk_dev_eject_request(blk, force);
1834 if (!force) {
1835 error_setg(errp, "Device '%s' is locked",
1836 bdrv_get_device_name(bs));
1837 goto out;
1838 }
1839 }
1840
1841 bdrv_close(bs);
1842
1843 out:
1844 aio_context_release(aio_context);
1845 }
1846
1847 void qmp_eject(const char *device, bool has_force, bool force, Error **errp)
1848 {
1849 BlockBackend *blk;
1850
1851 blk = blk_by_name(device);
1852 if (!blk) {
1853 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1854 return;
1855 }
1856
1857 eject_device(blk, force, errp);
1858 }
1859
1860 void qmp_block_passwd(bool has_device, const char *device,
1861 bool has_node_name, const char *node_name,
1862 const char *password, Error **errp)
1863 {
1864 Error *local_err = NULL;
1865 BlockDriverState *bs;
1866 AioContext *aio_context;
1867
1868 bs = bdrv_lookup_bs(has_device ? device : NULL,
1869 has_node_name ? node_name : NULL,
1870 &local_err);
1871 if (local_err) {
1872 error_propagate(errp, local_err);
1873 return;
1874 }
1875
1876 aio_context = bdrv_get_aio_context(bs);
1877 aio_context_acquire(aio_context);
1878
1879 bdrv_add_key(bs, password, errp);
1880
1881 aio_context_release(aio_context);
1882 }
1883
1884 /* Assumes AioContext is held */
1885 static void qmp_bdrv_open_encrypted(BlockDriverState *bs, const char *filename,
1886 int bdrv_flags, BlockDriver *drv,
1887 const char *password, Error **errp)
1888 {
1889 Error *local_err = NULL;
1890 int ret;
1891
1892 ret = bdrv_open(&bs, filename, NULL, NULL, bdrv_flags, drv, &local_err);
1893 if (ret < 0) {
1894 error_propagate(errp, local_err);
1895 return;
1896 }
1897
1898 bdrv_add_key(bs, password, errp);
1899 }
1900
1901 void qmp_change_blockdev(const char *device, const char *filename,
1902 const char *format, Error **errp)
1903 {
1904 BlockBackend *blk;
1905 BlockDriverState *bs;
1906 AioContext *aio_context;
1907 BlockDriver *drv = NULL;
1908 int bdrv_flags;
1909 Error *err = NULL;
1910
1911 blk = blk_by_name(device);
1912 if (!blk) {
1913 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1914 return;
1915 }
1916 bs = blk_bs(blk);
1917
1918 aio_context = bdrv_get_aio_context(bs);
1919 aio_context_acquire(aio_context);
1920
1921 if (format) {
1922 drv = bdrv_find_whitelisted_format(format, bs->read_only);
1923 if (!drv) {
1924 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
1925 goto out;
1926 }
1927 }
1928
1929 eject_device(blk, 0, &err);
1930 if (err) {
1931 error_propagate(errp, err);
1932 goto out;
1933 }
1934
1935 bdrv_flags = bdrv_is_read_only(bs) ? 0 : BDRV_O_RDWR;
1936 bdrv_flags |= bdrv_is_snapshot(bs) ? BDRV_O_SNAPSHOT : 0;
1937
1938 qmp_bdrv_open_encrypted(bs, filename, bdrv_flags, drv, NULL, errp);
1939
1940 out:
1941 aio_context_release(aio_context);
1942 }
1943
1944 /* throttling disk I/O limits */
1945 void qmp_block_set_io_throttle(const char *device, int64_t bps, int64_t bps_rd,
1946 int64_t bps_wr,
1947 int64_t iops,
1948 int64_t iops_rd,
1949 int64_t iops_wr,
1950 bool has_bps_max,
1951 int64_t bps_max,
1952 bool has_bps_rd_max,
1953 int64_t bps_rd_max,
1954 bool has_bps_wr_max,
1955 int64_t bps_wr_max,
1956 bool has_iops_max,
1957 int64_t iops_max,
1958 bool has_iops_rd_max,
1959 int64_t iops_rd_max,
1960 bool has_iops_wr_max,
1961 int64_t iops_wr_max,
1962 bool has_iops_size,
1963 int64_t iops_size,
1964 bool has_group,
1965 const char *group, Error **errp)
1966 {
1967 ThrottleConfig cfg;
1968 BlockDriverState *bs;
1969 BlockBackend *blk;
1970 AioContext *aio_context;
1971
1972 blk = blk_by_name(device);
1973 if (!blk) {
1974 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1975 return;
1976 }
1977 bs = blk_bs(blk);
1978
1979 memset(&cfg, 0, sizeof(cfg));
1980 cfg.buckets[THROTTLE_BPS_TOTAL].avg = bps;
1981 cfg.buckets[THROTTLE_BPS_READ].avg = bps_rd;
1982 cfg.buckets[THROTTLE_BPS_WRITE].avg = bps_wr;
1983
1984 cfg.buckets[THROTTLE_OPS_TOTAL].avg = iops;
1985 cfg.buckets[THROTTLE_OPS_READ].avg = iops_rd;
1986 cfg.buckets[THROTTLE_OPS_WRITE].avg = iops_wr;
1987
1988 if (has_bps_max) {
1989 cfg.buckets[THROTTLE_BPS_TOTAL].max = bps_max;
1990 }
1991 if (has_bps_rd_max) {
1992 cfg.buckets[THROTTLE_BPS_READ].max = bps_rd_max;
1993 }
1994 if (has_bps_wr_max) {
1995 cfg.buckets[THROTTLE_BPS_WRITE].max = bps_wr_max;
1996 }
1997 if (has_iops_max) {
1998 cfg.buckets[THROTTLE_OPS_TOTAL].max = iops_max;
1999 }
2000 if (has_iops_rd_max) {
2001 cfg.buckets[THROTTLE_OPS_READ].max = iops_rd_max;
2002 }
2003 if (has_iops_wr_max) {
2004 cfg.buckets[THROTTLE_OPS_WRITE].max = iops_wr_max;
2005 }
2006
2007 if (has_iops_size) {
2008 cfg.op_size = iops_size;
2009 }
2010
2011 if (!check_throttle_config(&cfg, errp)) {
2012 return;
2013 }
2014
2015 aio_context = bdrv_get_aio_context(bs);
2016 aio_context_acquire(aio_context);
2017
2018 if (throttle_enabled(&cfg)) {
2019 /* Enable I/O limits if they're not enabled yet, otherwise
2020 * just update the throttling group. */
2021 if (!bs->io_limits_enabled) {
2022 bdrv_io_limits_enable(bs, has_group ? group : device);
2023 } else if (has_group) {
2024 bdrv_io_limits_update_group(bs, group);
2025 }
2026 /* Set the new throttling configuration */
2027 bdrv_set_io_limits(bs, &cfg);
2028 } else if (bs->io_limits_enabled) {
2029 /* If all throttling settings are set to 0, disable I/O limits */
2030 bdrv_io_limits_disable(bs);
2031 }
2032
2033 aio_context_release(aio_context);
2034 }
2035
2036 void qmp_block_dirty_bitmap_add(const char *node, const char *name,
2037 bool has_granularity, uint32_t granularity,
2038 Error **errp)
2039 {
2040 AioContext *aio_context;
2041 BlockDriverState *bs;
2042
2043 if (!name || name[0] == '\0') {
2044 error_setg(errp, "Bitmap name cannot be empty");
2045 return;
2046 }
2047
2048 bs = bdrv_lookup_bs(node, node, errp);
2049 if (!bs) {
2050 return;
2051 }
2052
2053 aio_context = bdrv_get_aio_context(bs);
2054 aio_context_acquire(aio_context);
2055
2056 if (has_granularity) {
2057 if (granularity < 512 || !is_power_of_2(granularity)) {
2058 error_setg(errp, "Granularity must be power of 2 "
2059 "and at least 512");
2060 goto out;
2061 }
2062 } else {
2063 /* Default to cluster size, if available: */
2064 granularity = bdrv_get_default_bitmap_granularity(bs);
2065 }
2066
2067 bdrv_create_dirty_bitmap(bs, granularity, name, errp);
2068
2069 out:
2070 aio_context_release(aio_context);
2071 }
2072
2073 void qmp_block_dirty_bitmap_remove(const char *node, const char *name,
2074 Error **errp)
2075 {
2076 AioContext *aio_context;
2077 BlockDriverState *bs;
2078 BdrvDirtyBitmap *bitmap;
2079
2080 bitmap = block_dirty_bitmap_lookup(node, name, &bs, &aio_context, errp);
2081 if (!bitmap || !bs) {
2082 return;
2083 }
2084
2085 if (bdrv_dirty_bitmap_frozen(bitmap)) {
2086 error_setg(errp,
2087 "Bitmap '%s' is currently frozen and cannot be removed",
2088 name);
2089 goto out;
2090 }
2091 bdrv_dirty_bitmap_make_anon(bitmap);
2092 bdrv_release_dirty_bitmap(bs, bitmap);
2093
2094 out:
2095 aio_context_release(aio_context);
2096 }
2097
2098 /**
2099 * Completely clear a bitmap, for the purposes of synchronizing a bitmap
2100 * immediately after a full backup operation.
2101 */
2102 void qmp_block_dirty_bitmap_clear(const char *node, const char *name,
2103 Error **errp)
2104 {
2105 AioContext *aio_context;
2106 BdrvDirtyBitmap *bitmap;
2107 BlockDriverState *bs;
2108
2109 bitmap = block_dirty_bitmap_lookup(node, name, &bs, &aio_context, errp);
2110 if (!bitmap || !bs) {
2111 return;
2112 }
2113
2114 if (bdrv_dirty_bitmap_frozen(bitmap)) {
2115 error_setg(errp,
2116 "Bitmap '%s' is currently frozen and cannot be modified",
2117 name);
2118 goto out;
2119 } else if (!bdrv_dirty_bitmap_enabled(bitmap)) {
2120 error_setg(errp,
2121 "Bitmap '%s' is currently disabled and cannot be cleared",
2122 name);
2123 goto out;
2124 }
2125
2126 bdrv_clear_dirty_bitmap(bitmap);
2127
2128 out:
2129 aio_context_release(aio_context);
2130 }
2131
2132 void hmp_drive_del(Monitor *mon, const QDict *qdict)
2133 {
2134 const char *id = qdict_get_str(qdict, "id");
2135 BlockBackend *blk;
2136 BlockDriverState *bs;
2137 AioContext *aio_context;
2138 Error *local_err = NULL;
2139
2140 blk = blk_by_name(id);
2141 if (!blk) {
2142 error_report("Device '%s' not found", id);
2143 return;
2144 }
2145 bs = blk_bs(blk);
2146
2147 if (!blk_legacy_dinfo(blk)) {
2148 error_report("Deleting device added with blockdev-add"
2149 " is not supported");
2150 return;
2151 }
2152
2153 aio_context = bdrv_get_aio_context(bs);
2154 aio_context_acquire(aio_context);
2155
2156 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_DRIVE_DEL, &local_err)) {
2157 error_report_err(local_err);
2158 aio_context_release(aio_context);
2159 return;
2160 }
2161
2162 /* quiesce block driver; prevent further io */
2163 bdrv_drain_all();
2164 bdrv_flush(bs);
2165 bdrv_close(bs);
2166
2167 /* if we have a device attached to this BlockDriverState
2168 * then we need to make the drive anonymous until the device
2169 * can be removed. If this is a drive with no device backing
2170 * then we can just get rid of the block driver state right here.
2171 */
2172 if (blk_get_attached_dev(blk)) {
2173 blk_hide_on_behalf_of_hmp_drive_del(blk);
2174 /* Further I/O must not pause the guest */
2175 bdrv_set_on_error(bs, BLOCKDEV_ON_ERROR_REPORT,
2176 BLOCKDEV_ON_ERROR_REPORT);
2177 } else {
2178 blk_unref(blk);
2179 }
2180
2181 aio_context_release(aio_context);
2182 }
2183
2184 void qmp_block_resize(bool has_device, const char *device,
2185 bool has_node_name, const char *node_name,
2186 int64_t size, Error **errp)
2187 {
2188 Error *local_err = NULL;
2189 BlockDriverState *bs;
2190 AioContext *aio_context;
2191 int ret;
2192
2193 bs = bdrv_lookup_bs(has_device ? device : NULL,
2194 has_node_name ? node_name : NULL,
2195 &local_err);
2196 if (local_err) {
2197 error_propagate(errp, local_err);
2198 return;
2199 }
2200
2201 aio_context = bdrv_get_aio_context(bs);
2202 aio_context_acquire(aio_context);
2203
2204 if (!bdrv_is_first_non_filter(bs)) {
2205 error_set(errp, QERR_FEATURE_DISABLED, "resize");
2206 goto out;
2207 }
2208
2209 if (size < 0) {
2210 error_set(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size");
2211 goto out;
2212 }
2213
2214 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_RESIZE, NULL)) {
2215 error_set(errp, QERR_DEVICE_IN_USE, device);
2216 goto out;
2217 }
2218
2219 /* complete all in-flight operations before resizing the device */
2220 bdrv_drain_all();
2221
2222 ret = bdrv_truncate(bs, size);
2223 switch (ret) {
2224 case 0:
2225 break;
2226 case -ENOMEDIUM:
2227 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
2228 break;
2229 case -ENOTSUP:
2230 error_set(errp, QERR_UNSUPPORTED);
2231 break;
2232 case -EACCES:
2233 error_setg(errp, "Device '%s' is read only", device);
2234 break;
2235 case -EBUSY:
2236 error_set(errp, QERR_DEVICE_IN_USE, device);
2237 break;
2238 default:
2239 error_setg_errno(errp, -ret, "Could not resize");
2240 break;
2241 }
2242
2243 out:
2244 aio_context_release(aio_context);
2245 }
2246
2247 static void block_job_cb(void *opaque, int ret)
2248 {
2249 /* Note that this function may be executed from another AioContext besides
2250 * the QEMU main loop. If you need to access anything that assumes the
2251 * QEMU global mutex, use a BH or introduce a mutex.
2252 */
2253
2254 BlockDriverState *bs = opaque;
2255 const char *msg = NULL;
2256
2257 trace_block_job_cb(bs, bs->job, ret);
2258
2259 assert(bs->job);
2260
2261 if (ret < 0) {
2262 msg = strerror(-ret);
2263 }
2264
2265 if (block_job_is_cancelled(bs->job)) {
2266 block_job_event_cancelled(bs->job);
2267 } else {
2268 block_job_event_completed(bs->job, msg);
2269 }
2270
2271 bdrv_put_ref_bh_schedule(bs);
2272 }
2273
2274 void qmp_block_stream(const char *device,
2275 bool has_base, const char *base,
2276 bool has_backing_file, const char *backing_file,
2277 bool has_speed, int64_t speed,
2278 bool has_on_error, BlockdevOnError on_error,
2279 Error **errp)
2280 {
2281 BlockBackend *blk;
2282 BlockDriverState *bs;
2283 BlockDriverState *base_bs = NULL;
2284 AioContext *aio_context;
2285 Error *local_err = NULL;
2286 const char *base_name = NULL;
2287
2288 if (!has_on_error) {
2289 on_error = BLOCKDEV_ON_ERROR_REPORT;
2290 }
2291
2292 blk = blk_by_name(device);
2293 if (!blk) {
2294 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
2295 return;
2296 }
2297 bs = blk_bs(blk);
2298
2299 aio_context = bdrv_get_aio_context(bs);
2300 aio_context_acquire(aio_context);
2301
2302 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_STREAM, errp)) {
2303 goto out;
2304 }
2305
2306 if (has_base) {
2307 base_bs = bdrv_find_backing_image(bs, base);
2308 if (base_bs == NULL) {
2309 error_set(errp, QERR_BASE_NOT_FOUND, base);
2310 goto out;
2311 }
2312 assert(bdrv_get_aio_context(base_bs) == aio_context);
2313 base_name = base;
2314 }
2315
2316 /* if we are streaming the entire chain, the result will have no backing
2317 * file, and specifying one is therefore an error */
2318 if (base_bs == NULL && has_backing_file) {
2319 error_setg(errp, "backing file specified, but streaming the "
2320 "entire chain");
2321 goto out;
2322 }
2323
2324 /* backing_file string overrides base bs filename */
2325 base_name = has_backing_file ? backing_file : base_name;
2326
2327 stream_start(bs, base_bs, base_name, has_speed ? speed : 0,
2328 on_error, block_job_cb, bs, &local_err);
2329 if (local_err) {
2330 error_propagate(errp, local_err);
2331 goto out;
2332 }
2333
2334 trace_qmp_block_stream(bs, bs->job);
2335
2336 out:
2337 aio_context_release(aio_context);
2338 }
2339
2340 void qmp_block_commit(const char *device,
2341 bool has_base, const char *base,
2342 bool has_top, const char *top,
2343 bool has_backing_file, const char *backing_file,
2344 bool has_speed, int64_t speed,
2345 Error **errp)
2346 {
2347 BlockBackend *blk;
2348 BlockDriverState *bs;
2349 BlockDriverState *base_bs, *top_bs;
2350 AioContext *aio_context;
2351 Error *local_err = NULL;
2352 /* This will be part of the QMP command, if/when the
2353 * BlockdevOnError change for blkmirror makes it in
2354 */
2355 BlockdevOnError on_error = BLOCKDEV_ON_ERROR_REPORT;
2356
2357 if (!has_speed) {
2358 speed = 0;
2359 }
2360
2361 /* Important Note:
2362 * libvirt relies on the DeviceNotFound error class in order to probe for
2363 * live commit feature versions; for this to work, we must make sure to
2364 * perform the device lookup before any generic errors that may occur in a
2365 * scenario in which all optional arguments are omitted. */
2366 blk = blk_by_name(device);
2367 if (!blk) {
2368 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
2369 return;
2370 }
2371 bs = blk_bs(blk);
2372
2373 aio_context = bdrv_get_aio_context(bs);
2374 aio_context_acquire(aio_context);
2375
2376 /* drain all i/o before commits */
2377 bdrv_drain_all();
2378
2379 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_COMMIT_SOURCE, errp)) {
2380 goto out;
2381 }
2382
2383 /* default top_bs is the active layer */
2384 top_bs = bs;
2385
2386 if (has_top && top) {
2387 if (strcmp(bs->filename, top) != 0) {
2388 top_bs = bdrv_find_backing_image(bs, top);
2389 }
2390 }
2391
2392 if (top_bs == NULL) {
2393 error_setg(errp, "Top image file %s not found", top ? top : "NULL");
2394 goto out;
2395 }
2396
2397 assert(bdrv_get_aio_context(top_bs) == aio_context);
2398
2399 if (has_base && base) {
2400 base_bs = bdrv_find_backing_image(top_bs, base);
2401 } else {
2402 base_bs = bdrv_find_base(top_bs);
2403 }
2404
2405 if (base_bs == NULL) {
2406 error_set(errp, QERR_BASE_NOT_FOUND, base ? base : "NULL");
2407 goto out;
2408 }
2409
2410 assert(bdrv_get_aio_context(base_bs) == aio_context);
2411
2412 if (bdrv_op_is_blocked(base_bs, BLOCK_OP_TYPE_COMMIT_TARGET, errp)) {
2413 goto out;
2414 }
2415
2416 /* Do not allow attempts to commit an image into itself */
2417 if (top_bs == base_bs) {
2418 error_setg(errp, "cannot commit an image into itself");
2419 goto out;
2420 }
2421
2422 if (top_bs == bs) {
2423 if (has_backing_file) {
2424 error_setg(errp, "'backing-file' specified,"
2425 " but 'top' is the active layer");
2426 goto out;
2427 }
2428 commit_active_start(bs, base_bs, speed, on_error, block_job_cb,
2429 bs, &local_err);
2430 } else {
2431 commit_start(bs, base_bs, top_bs, speed, on_error, block_job_cb, bs,
2432 has_backing_file ? backing_file : NULL, &local_err);
2433 }
2434 if (local_err != NULL) {
2435 error_propagate(errp, local_err);
2436 goto out;
2437 }
2438
2439 out:
2440 aio_context_release(aio_context);
2441 }
2442
2443 void qmp_drive_backup(const char *device, const char *target,
2444 bool has_format, const char *format,
2445 enum MirrorSyncMode sync,
2446 bool has_mode, enum NewImageMode mode,
2447 bool has_speed, int64_t speed,
2448 bool has_bitmap, const char *bitmap,
2449 bool has_on_source_error, BlockdevOnError on_source_error,
2450 bool has_on_target_error, BlockdevOnError on_target_error,
2451 Error **errp)
2452 {
2453 BlockBackend *blk;
2454 BlockDriverState *bs;
2455 BlockDriverState *target_bs;
2456 BlockDriverState *source = NULL;
2457 BdrvDirtyBitmap *bmap = NULL;
2458 AioContext *aio_context;
2459 BlockDriver *drv = NULL;
2460 Error *local_err = NULL;
2461 int flags;
2462 int64_t size;
2463 int ret;
2464
2465 if (!has_speed) {
2466 speed = 0;
2467 }
2468 if (!has_on_source_error) {
2469 on_source_error = BLOCKDEV_ON_ERROR_REPORT;
2470 }
2471 if (!has_on_target_error) {
2472 on_target_error = BLOCKDEV_ON_ERROR_REPORT;
2473 }
2474 if (!has_mode) {
2475 mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
2476 }
2477
2478 blk = blk_by_name(device);
2479 if (!blk) {
2480 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
2481 return;
2482 }
2483 bs = blk_bs(blk);
2484
2485 aio_context = bdrv_get_aio_context(bs);
2486 aio_context_acquire(aio_context);
2487
2488 /* Although backup_run has this check too, we need to use bs->drv below, so
2489 * do an early check redundantly. */
2490 if (!bdrv_is_inserted(bs)) {
2491 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
2492 goto out;
2493 }
2494
2495 if (!has_format) {
2496 format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name;
2497 }
2498 if (format) {
2499 drv = bdrv_find_format(format);
2500 if (!drv) {
2501 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
2502 goto out;
2503 }
2504 }
2505
2506 /* Early check to avoid creating target */
2507 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_BACKUP_SOURCE, errp)) {
2508 goto out;
2509 }
2510
2511 flags = bs->open_flags | BDRV_O_RDWR;
2512
2513 /* See if we have a backing HD we can use to create our new image
2514 * on top of. */
2515 if (sync == MIRROR_SYNC_MODE_TOP) {
2516 source = bs->backing_hd;
2517 if (!source) {
2518 sync = MIRROR_SYNC_MODE_FULL;
2519 }
2520 }
2521 if (sync == MIRROR_SYNC_MODE_NONE) {
2522 source = bs;
2523 }
2524
2525 size = bdrv_getlength(bs);
2526 if (size < 0) {
2527 error_setg_errno(errp, -size, "bdrv_getlength failed");
2528 goto out;
2529 }
2530
2531 if (mode != NEW_IMAGE_MODE_EXISTING) {
2532 assert(format && drv);
2533 if (source) {
2534 bdrv_img_create(target, format, source->filename,
2535 source->drv->format_name, NULL,
2536 size, flags, &local_err, false);
2537 } else {
2538 bdrv_img_create(target, format, NULL, NULL, NULL,
2539 size, flags, &local_err, false);
2540 }
2541 }
2542
2543 if (local_err) {
2544 error_propagate(errp, local_err);
2545 goto out;
2546 }
2547
2548 target_bs = NULL;
2549 ret = bdrv_open(&target_bs, target, NULL, NULL, flags, drv, &local_err);
2550 if (ret < 0) {
2551 error_propagate(errp, local_err);
2552 goto out;
2553 }
2554
2555 bdrv_set_aio_context(target_bs, aio_context);
2556
2557 if (has_bitmap) {
2558 bmap = bdrv_find_dirty_bitmap(bs, bitmap);
2559 if (!bmap) {
2560 error_setg(errp, "Bitmap '%s' could not be found", bitmap);
2561 goto out;
2562 }
2563 }
2564
2565 backup_start(bs, target_bs, speed, sync, bmap,
2566 on_source_error, on_target_error,
2567 block_job_cb, bs, &local_err);
2568 if (local_err != NULL) {
2569 bdrv_unref(target_bs);
2570 error_propagate(errp, local_err);
2571 goto out;
2572 }
2573
2574 out:
2575 aio_context_release(aio_context);
2576 }
2577
2578 BlockDeviceInfoList *qmp_query_named_block_nodes(Error **errp)
2579 {
2580 return bdrv_named_nodes_list(errp);
2581 }
2582
2583 void qmp_blockdev_backup(const char *device, const char *target,
2584 enum MirrorSyncMode sync,
2585 bool has_speed, int64_t speed,
2586 bool has_on_source_error,
2587 BlockdevOnError on_source_error,
2588 bool has_on_target_error,
2589 BlockdevOnError on_target_error,
2590 Error **errp)
2591 {
2592 BlockBackend *blk;
2593 BlockDriverState *bs;
2594 BlockDriverState *target_bs;
2595 Error *local_err = NULL;
2596 AioContext *aio_context;
2597
2598 if (!has_speed) {
2599 speed = 0;
2600 }
2601 if (!has_on_source_error) {
2602 on_source_error = BLOCKDEV_ON_ERROR_REPORT;
2603 }
2604 if (!has_on_target_error) {
2605 on_target_error = BLOCKDEV_ON_ERROR_REPORT;
2606 }
2607
2608 blk = blk_by_name(device);
2609 if (!blk) {
2610 error_setg(errp, "Device '%s' not found", device);
2611 return;
2612 }
2613 bs = blk_bs(blk);
2614
2615 aio_context = bdrv_get_aio_context(bs);
2616 aio_context_acquire(aio_context);
2617
2618 blk = blk_by_name(target);
2619 if (!blk) {
2620 error_setg(errp, "Device '%s' not found", target);
2621 goto out;
2622 }
2623 target_bs = blk_bs(blk);
2624
2625 bdrv_ref(target_bs);
2626 bdrv_set_aio_context(target_bs, aio_context);
2627 backup_start(bs, target_bs, speed, sync, NULL, on_source_error,
2628 on_target_error, block_job_cb, bs, &local_err);
2629 if (local_err != NULL) {
2630 bdrv_unref(target_bs);
2631 error_propagate(errp, local_err);
2632 }
2633 out:
2634 aio_context_release(aio_context);
2635 }
2636
2637 #define DEFAULT_MIRROR_BUF_SIZE (10 << 20)
2638
2639 void qmp_drive_mirror(const char *device, const char *target,
2640 bool has_format, const char *format,
2641 bool has_node_name, const char *node_name,
2642 bool has_replaces, const char *replaces,
2643 enum MirrorSyncMode sync,
2644 bool has_mode, enum NewImageMode mode,
2645 bool has_speed, int64_t speed,
2646 bool has_granularity, uint32_t granularity,
2647 bool has_buf_size, int64_t buf_size,
2648 bool has_on_source_error, BlockdevOnError on_source_error,
2649 bool has_on_target_error, BlockdevOnError on_target_error,
2650 Error **errp)
2651 {
2652 BlockBackend *blk;
2653 BlockDriverState *bs;
2654 BlockDriverState *source, *target_bs;
2655 AioContext *aio_context;
2656 BlockDriver *drv = NULL;
2657 Error *local_err = NULL;
2658 QDict *options = NULL;
2659 int flags;
2660 int64_t size;
2661 int ret;
2662
2663 if (!has_speed) {
2664 speed = 0;
2665 }
2666 if (!has_on_source_error) {
2667 on_source_error = BLOCKDEV_ON_ERROR_REPORT;
2668 }
2669 if (!has_on_target_error) {
2670 on_target_error = BLOCKDEV_ON_ERROR_REPORT;
2671 }
2672 if (!has_mode) {
2673 mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
2674 }
2675 if (!has_granularity) {
2676 granularity = 0;
2677 }
2678 if (!has_buf_size) {
2679 buf_size = DEFAULT_MIRROR_BUF_SIZE;
2680 }
2681
2682 if (granularity != 0 && (granularity < 512 || granularity > 1048576 * 64)) {
2683 error_set(errp, QERR_INVALID_PARAMETER_VALUE, "granularity",
2684 "a value in range [512B, 64MB]");
2685 return;
2686 }
2687 if (granularity & (granularity - 1)) {
2688 error_set(errp, QERR_INVALID_PARAMETER_VALUE, "granularity", "power of 2");
2689 return;
2690 }
2691
2692 blk = blk_by_name(device);
2693 if (!blk) {
2694 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
2695 return;
2696 }
2697 bs = blk_bs(blk);
2698
2699 aio_context = bdrv_get_aio_context(bs);
2700 aio_context_acquire(aio_context);
2701
2702 if (!bdrv_is_inserted(bs)) {
2703 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
2704 goto out;
2705 }
2706
2707 if (!has_format) {
2708 format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name;
2709 }
2710 if (format) {
2711 drv = bdrv_find_format(format);
2712 if (!drv) {
2713 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
2714 goto out;
2715 }
2716 }
2717
2718 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_MIRROR, errp)) {
2719 goto out;
2720 }
2721
2722 flags = bs->open_flags | BDRV_O_RDWR;
2723 source = bs->backing_hd;
2724 if (!source && sync == MIRROR_SYNC_MODE_TOP) {
2725 sync = MIRROR_SYNC_MODE_FULL;
2726 }
2727 if (sync == MIRROR_SYNC_MODE_NONE) {
2728 source = bs;
2729 }
2730
2731 size = bdrv_getlength(bs);
2732 if (size < 0) {
2733 error_setg_errno(errp, -size, "bdrv_getlength failed");
2734 goto out;
2735 }
2736
2737 if (has_replaces) {
2738 BlockDriverState *to_replace_bs;
2739 AioContext *replace_aio_context;
2740 int64_t replace_size;
2741
2742 if (!has_node_name) {
2743 error_setg(errp, "a node-name must be provided when replacing a"
2744 " named node of the graph");
2745 goto out;
2746 }
2747
2748 to_replace_bs = check_to_replace_node(replaces, &local_err);
2749
2750 if (!to_replace_bs) {
2751 error_propagate(errp, local_err);
2752 goto out;
2753 }
2754
2755 replace_aio_context = bdrv_get_aio_context(to_replace_bs);
2756 aio_context_acquire(replace_aio_context);
2757 replace_size = bdrv_getlength(to_replace_bs);
2758 aio_context_release(replace_aio_context);
2759
2760 if (size != replace_size) {
2761 error_setg(errp, "cannot replace image with a mirror image of "
2762 "different size");
2763 goto out;
2764 }
2765 }
2766
2767 if ((sync == MIRROR_SYNC_MODE_FULL || !source)
2768 && mode != NEW_IMAGE_MODE_EXISTING)
2769 {
2770 /* create new image w/o backing file */
2771 assert(format && drv);
2772 bdrv_img_create(target, format,
2773 NULL, NULL, NULL, size, flags, &local_err, false);
2774 } else {
2775 switch (mode) {
2776 case NEW_IMAGE_MODE_EXISTING:
2777 break;
2778 case NEW_IMAGE_MODE_ABSOLUTE_PATHS:
2779 /* create new image with backing file */
2780 bdrv_img_create(target, format,
2781 source->filename,
2782 source->drv->format_name,
2783 NULL, size, flags, &local_err, false);
2784 break;
2785 default:
2786 abort();
2787 }
2788 }
2789
2790 if (local_err) {
2791 error_propagate(errp, local_err);
2792 goto out;
2793 }
2794
2795 if (has_node_name) {
2796 options = qdict_new();
2797 qdict_put(options, "node-name", qstring_from_str(node_name));
2798 }
2799
2800 /* Mirroring takes care of copy-on-write using the source's backing
2801 * file.
2802 */
2803 target_bs = NULL;
2804 ret = bdrv_open(&target_bs, target, NULL, options,
2805 flags | BDRV_O_NO_BACKING, drv, &local_err);
2806 if (ret < 0) {
2807 error_propagate(errp, local_err);
2808 goto out;
2809 }
2810
2811 bdrv_set_aio_context(target_bs, aio_context);
2812
2813 /* pass the node name to replace to mirror start since it's loose coupling
2814 * and will allow to check whether the node still exist at mirror completion
2815 */
2816 mirror_start(bs, target_bs,
2817 has_replaces ? replaces : NULL,
2818 speed, granularity, buf_size, sync,
2819 on_source_error, on_target_error,
2820 block_job_cb, bs, &local_err);
2821 if (local_err != NULL) {
2822 bdrv_unref(target_bs);
2823 error_propagate(errp, local_err);
2824 goto out;
2825 }
2826
2827 out:
2828 aio_context_release(aio_context);
2829 }
2830
2831 /* Get the block job for a given device name and acquire its AioContext */
2832 static BlockJob *find_block_job(const char *device, AioContext **aio_context,
2833 Error **errp)
2834 {
2835 BlockBackend *blk;
2836 BlockDriverState *bs;
2837
2838 blk = blk_by_name(device);
2839 if (!blk) {
2840 goto notfound;
2841 }
2842 bs = blk_bs(blk);
2843
2844 *aio_context = bdrv_get_aio_context(bs);
2845 aio_context_acquire(*aio_context);
2846
2847 if (!bs->job) {
2848 aio_context_release(*aio_context);
2849 goto notfound;
2850 }
2851
2852 return bs->job;
2853
2854 notfound:
2855 error_set(errp, ERROR_CLASS_DEVICE_NOT_ACTIVE,
2856 "No active block job on device '%s'", device);
2857 *aio_context = NULL;
2858 return NULL;
2859 }
2860
2861 void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp)
2862 {
2863 AioContext *aio_context;
2864 BlockJob *job = find_block_job(device, &aio_context, errp);
2865
2866 if (!job) {
2867 return;
2868 }
2869
2870 block_job_set_speed(job, speed, errp);
2871 aio_context_release(aio_context);
2872 }
2873
2874 void qmp_block_job_cancel(const char *device,
2875 bool has_force, bool force, Error **errp)
2876 {
2877 AioContext *aio_context;
2878 BlockJob *job = find_block_job(device, &aio_context, errp);
2879
2880 if (!job) {
2881 return;
2882 }
2883
2884 if (!has_force) {
2885 force = false;
2886 }
2887
2888 if (job->user_paused && !force) {
2889 error_setg(errp, "The block job for device '%s' is currently paused",
2890 device);
2891 goto out;
2892 }
2893
2894 trace_qmp_block_job_cancel(job);
2895 block_job_cancel(job);
2896 out:
2897 aio_context_release(aio_context);
2898 }
2899
2900 void qmp_block_job_pause(const char *device, Error **errp)
2901 {
2902 AioContext *aio_context;
2903 BlockJob *job = find_block_job(device, &aio_context, errp);
2904
2905 if (!job || job->user_paused) {
2906 return;
2907 }
2908
2909 job->user_paused = true;
2910 trace_qmp_block_job_pause(job);
2911 block_job_pause(job);
2912 aio_context_release(aio_context);
2913 }
2914
2915 void qmp_block_job_resume(const char *device, Error **errp)
2916 {
2917 AioContext *aio_context;
2918 BlockJob *job = find_block_job(device, &aio_context, errp);
2919
2920 if (!job || !job->user_paused) {
2921 return;
2922 }
2923
2924 job->user_paused = false;
2925 trace_qmp_block_job_resume(job);
2926 block_job_resume(job);
2927 aio_context_release(aio_context);
2928 }
2929
2930 void qmp_block_job_complete(const char *device, 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 trace_qmp_block_job_complete(job);
2940 block_job_complete(job, errp);
2941 aio_context_release(aio_context);
2942 }
2943
2944 void qmp_change_backing_file(const char *device,
2945 const char *image_node_name,
2946 const char *backing_file,
2947 Error **errp)
2948 {
2949 BlockBackend *blk;
2950 BlockDriverState *bs = NULL;
2951 AioContext *aio_context;
2952 BlockDriverState *image_bs = NULL;
2953 Error *local_err = NULL;
2954 bool ro;
2955 int open_flags;
2956 int ret;
2957
2958 blk = blk_by_name(device);
2959 if (!blk) {
2960 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
2961 return;
2962 }
2963 bs = blk_bs(blk);
2964
2965 aio_context = bdrv_get_aio_context(bs);
2966 aio_context_acquire(aio_context);
2967
2968 image_bs = bdrv_lookup_bs(NULL, image_node_name, &local_err);
2969 if (local_err) {
2970 error_propagate(errp, local_err);
2971 goto out;
2972 }
2973
2974 if (!image_bs) {
2975 error_setg(errp, "image file not found");
2976 goto out;
2977 }
2978
2979 if (bdrv_find_base(image_bs) == image_bs) {
2980 error_setg(errp, "not allowing backing file change on an image "
2981 "without a backing file");
2982 goto out;
2983 }
2984
2985 /* even though we are not necessarily operating on bs, we need it to
2986 * determine if block ops are currently prohibited on the chain */
2987 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_CHANGE, errp)) {
2988 goto out;
2989 }
2990
2991 /* final sanity check */
2992 if (!bdrv_chain_contains(bs, image_bs)) {
2993 error_setg(errp, "'%s' and image file are not in the same chain",
2994 device);
2995 goto out;
2996 }
2997
2998 /* if not r/w, reopen to make r/w */
2999 open_flags = image_bs->open_flags;
3000 ro = bdrv_is_read_only(image_bs);
3001
3002 if (ro) {
3003 bdrv_reopen(image_bs, open_flags | BDRV_O_RDWR, &local_err);
3004 if (local_err) {
3005 error_propagate(errp, local_err);
3006 goto out;
3007 }
3008 }
3009
3010 ret = bdrv_change_backing_file(image_bs, backing_file,
3011 image_bs->drv ? image_bs->drv->format_name : "");
3012
3013 if (ret < 0) {
3014 error_setg_errno(errp, -ret, "Could not change backing file to '%s'",
3015 backing_file);
3016 /* don't exit here, so we can try to restore open flags if
3017 * appropriate */
3018 }
3019
3020 if (ro) {
3021 bdrv_reopen(image_bs, open_flags, &local_err);
3022 if (local_err) {
3023 error_propagate(errp, local_err); /* will preserve prior errp */
3024 }
3025 }
3026
3027 out:
3028 aio_context_release(aio_context);
3029 }
3030
3031 void qmp_blockdev_add(BlockdevOptions *options, Error **errp)
3032 {
3033 QmpOutputVisitor *ov = qmp_output_visitor_new();
3034 BlockBackend *blk;
3035 QObject *obj;
3036 QDict *qdict;
3037 Error *local_err = NULL;
3038
3039 /* Require an ID in the top level */
3040 if (!options->has_id) {
3041 error_setg(errp, "Block device needs an ID");
3042 goto fail;
3043 }
3044
3045 /* TODO Sort it out in raw-posix and drive_new(): Reject aio=native with
3046 * cache.direct=false instead of silently switching to aio=threads, except
3047 * when called from drive_new().
3048 *
3049 * For now, simply forbidding the combination for all drivers will do. */
3050 if (options->has_aio && options->aio == BLOCKDEV_AIO_OPTIONS_NATIVE) {
3051 bool direct = options->has_cache &&
3052 options->cache->has_direct &&
3053 options->cache->direct;
3054 if (!direct) {
3055 error_setg(errp, "aio=native requires cache.direct=true");
3056 goto fail;
3057 }
3058 }
3059
3060 visit_type_BlockdevOptions(qmp_output_get_visitor(ov),
3061 &options, NULL, &local_err);
3062 if (local_err) {
3063 error_propagate(errp, local_err);
3064 goto fail;
3065 }
3066
3067 obj = qmp_output_get_qobject(ov);
3068 qdict = qobject_to_qdict(obj);
3069
3070 qdict_flatten(qdict);
3071
3072 blk = blockdev_init(NULL, qdict, &local_err);
3073 if (local_err) {
3074 error_propagate(errp, local_err);
3075 goto fail;
3076 }
3077
3078 if (bdrv_key_required(blk_bs(blk))) {
3079 blk_unref(blk);
3080 error_setg(errp, "blockdev-add doesn't support encrypted devices");
3081 goto fail;
3082 }
3083
3084 fail:
3085 qmp_output_visitor_cleanup(ov);
3086 }
3087
3088 BlockJobInfoList *qmp_query_block_jobs(Error **errp)
3089 {
3090 BlockJobInfoList *head = NULL, **p_next = &head;
3091 BlockDriverState *bs;
3092
3093 for (bs = bdrv_next(NULL); bs; bs = bdrv_next(bs)) {
3094 AioContext *aio_context = bdrv_get_aio_context(bs);
3095
3096 aio_context_acquire(aio_context);
3097
3098 if (bs->job) {
3099 BlockJobInfoList *elem = g_new0(BlockJobInfoList, 1);
3100 elem->value = block_job_query(bs->job);
3101 *p_next = elem;
3102 p_next = &elem->next;
3103 }
3104
3105 aio_context_release(aio_context);
3106 }
3107
3108 return head;
3109 }
3110
3111 QemuOptsList qemu_common_drive_opts = {
3112 .name = "drive",
3113 .head = QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts.head),
3114 .desc = {
3115 {
3116 .name = "snapshot",
3117 .type = QEMU_OPT_BOOL,
3118 .help = "enable/disable snapshot mode",
3119 },{
3120 .name = "discard",
3121 .type = QEMU_OPT_STRING,
3122 .help = "discard operation (ignore/off, unmap/on)",
3123 },{
3124 .name = BDRV_OPT_CACHE_WB,
3125 .type = QEMU_OPT_BOOL,
3126 .help = "enables writeback mode for any caches",
3127 },{
3128 .name = BDRV_OPT_CACHE_DIRECT,
3129 .type = QEMU_OPT_BOOL,
3130 .help = "enables use of O_DIRECT (bypass the host page cache)",
3131 },{
3132 .name = BDRV_OPT_CACHE_NO_FLUSH,
3133 .type = QEMU_OPT_BOOL,
3134 .help = "ignore any flush requests for the device",
3135 },{
3136 .name = "aio",
3137 .type = QEMU_OPT_STRING,
3138 .help = "host AIO implementation (threads, native)",
3139 },{
3140 .name = "format",
3141 .type = QEMU_OPT_STRING,
3142 .help = "disk format (raw, qcow2, ...)",
3143 },{
3144 .name = "rerror",
3145 .type = QEMU_OPT_STRING,
3146 .help = "read error action",
3147 },{
3148 .name = "werror",
3149 .type = QEMU_OPT_STRING,
3150 .help = "write error action",
3151 },{
3152 .name = "read-only",
3153 .type = QEMU_OPT_BOOL,
3154 .help = "open drive file as read-only",
3155 },{
3156 .name = "throttling.iops-total",
3157 .type = QEMU_OPT_NUMBER,
3158 .help = "limit total I/O operations per second",
3159 },{
3160 .name = "throttling.iops-read",
3161 .type = QEMU_OPT_NUMBER,
3162 .help = "limit read operations per second",
3163 },{
3164 .name = "throttling.iops-write",
3165 .type = QEMU_OPT_NUMBER,
3166 .help = "limit write operations per second",
3167 },{
3168 .name = "throttling.bps-total",
3169 .type = QEMU_OPT_NUMBER,
3170 .help = "limit total bytes per second",
3171 },{
3172 .name = "throttling.bps-read",
3173 .type = QEMU_OPT_NUMBER,
3174 .help = "limit read bytes per second",
3175 },{
3176 .name = "throttling.bps-write",
3177 .type = QEMU_OPT_NUMBER,
3178 .help = "limit write bytes per second",
3179 },{
3180 .name = "throttling.iops-total-max",
3181 .type = QEMU_OPT_NUMBER,
3182 .help = "I/O operations burst",
3183 },{
3184 .name = "throttling.iops-read-max",
3185 .type = QEMU_OPT_NUMBER,
3186 .help = "I/O operations read burst",
3187 },{
3188 .name = "throttling.iops-write-max",
3189 .type = QEMU_OPT_NUMBER,
3190 .help = "I/O operations write burst",
3191 },{
3192 .name = "throttling.bps-total-max",
3193 .type = QEMU_OPT_NUMBER,
3194 .help = "total bytes burst",
3195 },{
3196 .name = "throttling.bps-read-max",
3197 .type = QEMU_OPT_NUMBER,
3198 .help = "total bytes read burst",
3199 },{
3200 .name = "throttling.bps-write-max",
3201 .type = QEMU_OPT_NUMBER,
3202 .help = "total bytes write burst",
3203 },{
3204 .name = "throttling.iops-size",
3205 .type = QEMU_OPT_NUMBER,
3206 .help = "when limiting by iops max size of an I/O in bytes",
3207 },{
3208 .name = "throttling.group",
3209 .type = QEMU_OPT_STRING,
3210 .help = "name of the block throttling group",
3211 },{
3212 .name = "copy-on-read",
3213 .type = QEMU_OPT_BOOL,
3214 .help = "copy read data from backing file into image file",
3215 },{
3216 .name = "detect-zeroes",
3217 .type = QEMU_OPT_STRING,
3218 .help = "try to optimize zero writes (off, on, unmap)",
3219 },
3220 { /* end of list */ }
3221 },
3222 };
3223
3224 QemuOptsList qemu_drive_opts = {
3225 .name = "drive",
3226 .head = QTAILQ_HEAD_INITIALIZER(qemu_drive_opts.head),
3227 .desc = {
3228 /*
3229 * no elements => accept any params
3230 * validation will happen later
3231 */
3232 { /* end of list */ }
3233 },
3234 };
AR7 emulation for QEMU