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block/nfs: cache allocated filesize for read-only files
[qemu/ar7.git] / blockdev.c
blob32b04b478c73873cd54ad2d93a189ecdeeda268c
1 /*
2 * QEMU host block devices
3 *
4 * Copyright (c) 2003-2008 Fabrice Bellard
5 *
6 * This work is licensed under the terms of the GNU GPL, version 2 or
7 * later. See the COPYING file in the top-level directory.
8 *
9 * This file incorporates work covered by the following copyright and
10 * permission notice:
11 *
12 * Copyright (c) 2003-2008 Fabrice Bellard
13 *
14 * Permission is hereby granted, free of charge, to any person obtaining a copy
15 * of this software and associated documentation files (the "Software"), to deal
16 * in the Software without restriction, including without limitation the rights
17 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
18 * copies of the Software, and to permit persons to whom the Software is
19 * furnished to do so, subject to the following conditions:
20 *
21 * The above copyright notice and this permission notice shall be included in
22 * all copies or substantial portions of the Software.
23 *
24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
25 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
26 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
27 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
28 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
29 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
30 * THE SOFTWARE.
31 */
32
33 #include "sysemu/block-backend.h"
34 #include "sysemu/blockdev.h"
35 #include "hw/block/block.h"
36 #include "block/blockjob.h"
37 #include "block/throttle-groups.h"
38 #include "monitor/monitor.h"
39 #include "qemu/error-report.h"
40 #include "qemu/option.h"
41 #include "qemu/config-file.h"
42 #include "qapi/qmp/types.h"
43 #include "qapi-visit.h"
44 #include "qapi/qmp/qerror.h"
45 #include "qapi/qmp-output-visitor.h"
46 #include "qapi/util.h"
47 #include "sysemu/sysemu.h"
48 #include "block/block_int.h"
49 #include "qmp-commands.h"
50 #include "trace.h"
51 #include "sysemu/arch_init.h"
52
53 static const char *const if_name[IF_COUNT] = {
54 [IF_NONE] = "none",
55 [IF_IDE] = "ide",
56 [IF_SCSI] = "scsi",
57 [IF_FLOPPY] = "floppy",
58 [IF_PFLASH] = "pflash",
59 [IF_MTD] = "mtd",
60 [IF_SD] = "sd",
61 [IF_VIRTIO] = "virtio",
62 [IF_XEN] = "xen",
63 };
64
65 static int if_max_devs[IF_COUNT] = {
66 /*
67 * Do not change these numbers! They govern how drive option
68 * index maps to unit and bus. That mapping is ABI.
69 *
70 * All controllers used to imlement if=T drives need to support
71 * if_max_devs[T] units, for any T with if_max_devs[T] != 0.
72 * Otherwise, some index values map to "impossible" bus, unit
73 * values.
74 *
75 * For instance, if you change [IF_SCSI] to 255, -drive
76 * if=scsi,index=12 no longer means bus=1,unit=5, but
77 * bus=0,unit=12. With an lsi53c895a controller (7 units max),
78 * the drive can't be set up. Regression.
79 */
80 [IF_IDE] = 2,
81 [IF_SCSI] = 7,
82 };
83
84 /**
85 * Boards may call this to offer board-by-board overrides
86 * of the default, global values.
87 */
88 void override_max_devs(BlockInterfaceType type, int max_devs)
89 {
90 BlockBackend *blk;
91 DriveInfo *dinfo;
92
93 if (max_devs <= 0) {
94 return;
95 }
96
97 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
98 dinfo = blk_legacy_dinfo(blk);
99 if (dinfo->type == type) {
100 fprintf(stderr, "Cannot override units-per-bus property of"
101 " the %s interface, because a drive of that type has"
102 " already been added.\n", if_name[type]);
103 g_assert_not_reached();
104 }
105 }
106
107 if_max_devs[type] = max_devs;
108 }
109
110 /*
111 * We automatically delete the drive when a device using it gets
112 * unplugged. Questionable feature, but we can't just drop it.
113 * Device models call blockdev_mark_auto_del() to schedule the
114 * automatic deletion, and generic qdev code calls blockdev_auto_del()
115 * when deletion is actually safe.
116 */
117 void blockdev_mark_auto_del(BlockBackend *blk)
118 {
119 DriveInfo *dinfo = blk_legacy_dinfo(blk);
120 BlockDriverState *bs = blk_bs(blk);
121 AioContext *aio_context;
122
123 if (!dinfo) {
124 return;
125 }
126
127 aio_context = bdrv_get_aio_context(bs);
128 aio_context_acquire(aio_context);
129
130 if (bs->job) {
131 block_job_cancel(bs->job);
132 }
133
134 aio_context_release(aio_context);
135
136 dinfo->auto_del = 1;
137 }
138
139 void blockdev_auto_del(BlockBackend *blk)
140 {
141 DriveInfo *dinfo = blk_legacy_dinfo(blk);
142
143 if (dinfo && dinfo->auto_del) {
144 blk_unref(blk);
145 }
146 }
147
148 /**
149 * Returns the current mapping of how many units per bus
150 * a particular interface can support.
151 *
152 * A positive integer indicates n units per bus.
153 * 0 implies the mapping has not been established.
154 * -1 indicates an invalid BlockInterfaceType was given.
155 */
156 int drive_get_max_devs(BlockInterfaceType type)
157 {
158 if (type >= IF_IDE && type < IF_COUNT) {
159 return if_max_devs[type];
160 }
161
162 return -1;
163 }
164
165 static int drive_index_to_bus_id(BlockInterfaceType type, int index)
166 {
167 int max_devs = if_max_devs[type];
168 return max_devs ? index / max_devs : 0;
169 }
170
171 static int drive_index_to_unit_id(BlockInterfaceType type, int index)
172 {
173 int max_devs = if_max_devs[type];
174 return max_devs ? index % max_devs : index;
175 }
176
177 QemuOpts *drive_def(const char *optstr)
178 {
179 return qemu_opts_parse_noisily(qemu_find_opts("drive"), optstr, false);
180 }
181
182 QemuOpts *drive_add(BlockInterfaceType type, int index, const char *file,
183 const char *optstr)
184 {
185 QemuOpts *opts;
186
187 opts = drive_def(optstr);
188 if (!opts) {
189 return NULL;
190 }
191 if (type != IF_DEFAULT) {
192 qemu_opt_set(opts, "if", if_name[type], &error_abort);
193 }
194 if (index >= 0) {
195 qemu_opt_set_number(opts, "index", index, &error_abort);
196 }
197 if (file)
198 qemu_opt_set(opts, "file", file, &error_abort);
199 return opts;
200 }
201
202 DriveInfo *drive_get(BlockInterfaceType type, int bus, int unit)
203 {
204 BlockBackend *blk;
205 DriveInfo *dinfo;
206
207 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
208 dinfo = blk_legacy_dinfo(blk);
209 if (dinfo && dinfo->type == type
210 && dinfo->bus == bus && dinfo->unit == unit) {
211 return dinfo;
212 }
213 }
214
215 return NULL;
216 }
217
218 bool drive_check_orphaned(void)
219 {
220 BlockBackend *blk;
221 DriveInfo *dinfo;
222 bool rs = false;
223
224 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
225 dinfo = blk_legacy_dinfo(blk);
226 /* If dinfo->bdrv->dev is NULL, it has no device attached. */
227 /* Unless this is a default drive, this may be an oversight. */
228 if (!blk_get_attached_dev(blk) && !dinfo->is_default &&
229 dinfo->type != IF_NONE) {
230 fprintf(stderr, "Warning: Orphaned drive without device: "
231 "id=%s,file=%s,if=%s,bus=%d,unit=%d\n",
232 blk_name(blk), blk_bs(blk)->filename, if_name[dinfo->type],
233 dinfo->bus, dinfo->unit);
234 rs = true;
235 }
236 }
237
238 return rs;
239 }
240
241 DriveInfo *drive_get_by_index(BlockInterfaceType type, int index)
242 {
243 return drive_get(type,
244 drive_index_to_bus_id(type, index),
245 drive_index_to_unit_id(type, index));
246 }
247
248 int drive_get_max_bus(BlockInterfaceType type)
249 {
250 int max_bus;
251 BlockBackend *blk;
252 DriveInfo *dinfo;
253
254 max_bus = -1;
255 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
256 dinfo = blk_legacy_dinfo(blk);
257 if (dinfo && dinfo->type == type && dinfo->bus > max_bus) {
258 max_bus = dinfo->bus;
259 }
260 }
261 return max_bus;
262 }
263
264 /* Get a block device. This should only be used for single-drive devices
265 (e.g. SD/Floppy/MTD). Multi-disk devices (scsi/ide) should use the
266 appropriate bus. */
267 DriveInfo *drive_get_next(BlockInterfaceType type)
268 {
269 static int next_block_unit[IF_COUNT];
270
271 return drive_get(type, 0, next_block_unit[type]++);
272 }
273
274 static void bdrv_format_print(void *opaque, const char *name)
275 {
276 error_printf(" %s", name);
277 }
278
279 typedef struct {
280 QEMUBH *bh;
281 BlockDriverState *bs;
282 } BDRVPutRefBH;
283
284 static void bdrv_put_ref_bh(void *opaque)
285 {
286 BDRVPutRefBH *s = opaque;
287
288 bdrv_unref(s->bs);
289 qemu_bh_delete(s->bh);
290 g_free(s);
291 }
292
293 /*
294 * Release a BDS reference in a BH
295 *
296 * It is not safe to use bdrv_unref() from a callback function when the callers
297 * still need the BlockDriverState. In such cases we schedule a BH to release
298 * the reference.
299 */
300 static void bdrv_put_ref_bh_schedule(BlockDriverState *bs)
301 {
302 BDRVPutRefBH *s;
303
304 s = g_new(BDRVPutRefBH, 1);
305 s->bh = qemu_bh_new(bdrv_put_ref_bh, s);
306 s->bs = bs;
307 qemu_bh_schedule(s->bh);
308 }
309
310 static int parse_block_error_action(const char *buf, bool is_read, Error **errp)
311 {
312 if (!strcmp(buf, "ignore")) {
313 return BLOCKDEV_ON_ERROR_IGNORE;
314 } else if (!is_read && !strcmp(buf, "enospc")) {
315 return BLOCKDEV_ON_ERROR_ENOSPC;
316 } else if (!strcmp(buf, "stop")) {
317 return BLOCKDEV_ON_ERROR_STOP;
318 } else if (!strcmp(buf, "report")) {
319 return BLOCKDEV_ON_ERROR_REPORT;
320 } else {
321 error_setg(errp, "'%s' invalid %s error action",
322 buf, is_read ? "read" : "write");
323 return -1;
324 }
325 }
326
327 static bool check_throttle_config(ThrottleConfig *cfg, Error **errp)
328 {
329 if (throttle_conflicting(cfg)) {
330 error_setg(errp, "bps/iops/max total values and read/write values"
331 " cannot be used at the same time");
332 return false;
333 }
334
335 if (!throttle_is_valid(cfg)) {
336 error_setg(errp, "bps/iops/maxs values must be 0 or greater");
337 return false;
338 }
339
340 if (throttle_max_is_missing_limit(cfg)) {
341 error_setg(errp, "bps_max/iops_max require corresponding"
342 " bps/iops values");
343 return false;
344 }
345
346 return true;
347 }
348
349 typedef enum { MEDIA_DISK, MEDIA_CDROM } DriveMediaType;
350
351 /* Takes the ownership of bs_opts */
352 static BlockBackend *blockdev_init(const char *file, QDict *bs_opts,
353 Error **errp)
354 {
355 const char *buf;
356 int ro = 0;
357 int bdrv_flags = 0;
358 int on_read_error, on_write_error;
359 BlockBackend *blk;
360 BlockDriverState *bs;
361 ThrottleConfig cfg;
362 int snapshot = 0;
363 bool copy_on_read;
364 Error *error = NULL;
365 QemuOpts *opts;
366 const char *id;
367 bool has_driver_specific_opts;
368 BlockdevDetectZeroesOptions detect_zeroes;
369 const char *throttling_group;
370
371 /* Check common options by copying from bs_opts to opts, all other options
372 * stay in bs_opts for processing by bdrv_open(). */
373 id = qdict_get_try_str(bs_opts, "id");
374 opts = qemu_opts_create(&qemu_common_drive_opts, id, 1, &error);
375 if (error) {
376 error_propagate(errp, error);
377 goto err_no_opts;
378 }
379
380 qemu_opts_absorb_qdict(opts, bs_opts, &error);
381 if (error) {
382 error_propagate(errp, error);
383 goto early_err;
384 }
385
386 if (id) {
387 qdict_del(bs_opts, "id");
388 }
389
390 has_driver_specific_opts = !!qdict_size(bs_opts);
391
392 /* extract parameters */
393 snapshot = qemu_opt_get_bool(opts, "snapshot", 0);
394 ro = qemu_opt_get_bool(opts, "read-only", 0);
395 copy_on_read = qemu_opt_get_bool(opts, "copy-on-read", false);
396
397 if ((buf = qemu_opt_get(opts, "discard")) != NULL) {
398 if (bdrv_parse_discard_flags(buf, &bdrv_flags) != 0) {
399 error_setg(errp, "invalid discard option");
400 goto early_err;
401 }
402 }
403
404 if (qemu_opt_get_bool(opts, BDRV_OPT_CACHE_WB, true)) {
405 bdrv_flags |= BDRV_O_CACHE_WB;
406 }
407 if (qemu_opt_get_bool(opts, BDRV_OPT_CACHE_DIRECT, false)) {
408 bdrv_flags |= BDRV_O_NOCACHE;
409 }
410 if (qemu_opt_get_bool(opts, BDRV_OPT_CACHE_NO_FLUSH, false)) {
411 bdrv_flags |= BDRV_O_NO_FLUSH;
412 }
413
414 #ifdef CONFIG_LINUX_AIO
415 if ((buf = qemu_opt_get(opts, "aio")) != NULL) {
416 if (!strcmp(buf, "native")) {
417 bdrv_flags |= BDRV_O_NATIVE_AIO;
418 } else if (!strcmp(buf, "threads")) {
419 /* this is the default */
420 } else {
421 error_setg(errp, "invalid aio option");
422 goto early_err;
423 }
424 }
425 #endif
426
427 if ((buf = qemu_opt_get(opts, "format")) != NULL) {
428 if (is_help_option(buf)) {
429 error_printf("Supported formats:");
430 bdrv_iterate_format(bdrv_format_print, NULL);
431 error_printf("\n");
432 goto early_err;
433 }
434
435 if (qdict_haskey(bs_opts, "driver")) {
436 error_setg(errp, "Cannot specify both 'driver' and 'format'");
437 goto early_err;
438 }
439 qdict_put(bs_opts, "driver", qstring_from_str(buf));
440 }
441
442 /* disk I/O throttling */
443 memset(&cfg, 0, sizeof(cfg));
444 cfg.buckets[THROTTLE_BPS_TOTAL].avg =
445 qemu_opt_get_number(opts, "throttling.bps-total", 0);
446 cfg.buckets[THROTTLE_BPS_READ].avg =
447 qemu_opt_get_number(opts, "throttling.bps-read", 0);
448 cfg.buckets[THROTTLE_BPS_WRITE].avg =
449 qemu_opt_get_number(opts, "throttling.bps-write", 0);
450 cfg.buckets[THROTTLE_OPS_TOTAL].avg =
451 qemu_opt_get_number(opts, "throttling.iops-total", 0);
452 cfg.buckets[THROTTLE_OPS_READ].avg =
453 qemu_opt_get_number(opts, "throttling.iops-read", 0);
454 cfg.buckets[THROTTLE_OPS_WRITE].avg =
455 qemu_opt_get_number(opts, "throttling.iops-write", 0);
456
457 cfg.buckets[THROTTLE_BPS_TOTAL].max =
458 qemu_opt_get_number(opts, "throttling.bps-total-max", 0);
459 cfg.buckets[THROTTLE_BPS_READ].max =
460 qemu_opt_get_number(opts, "throttling.bps-read-max", 0);
461 cfg.buckets[THROTTLE_BPS_WRITE].max =
462 qemu_opt_get_number(opts, "throttling.bps-write-max", 0);
463 cfg.buckets[THROTTLE_OPS_TOTAL].max =
464 qemu_opt_get_number(opts, "throttling.iops-total-max", 0);
465 cfg.buckets[THROTTLE_OPS_READ].max =
466 qemu_opt_get_number(opts, "throttling.iops-read-max", 0);
467 cfg.buckets[THROTTLE_OPS_WRITE].max =
468 qemu_opt_get_number(opts, "throttling.iops-write-max", 0);
469
470 cfg.op_size = qemu_opt_get_number(opts, "throttling.iops-size", 0);
471
472 throttling_group = qemu_opt_get(opts, "throttling.group");
473
474 if (!check_throttle_config(&cfg, &error)) {
475 error_propagate(errp, error);
476 goto early_err;
477 }
478
479 on_write_error = BLOCKDEV_ON_ERROR_ENOSPC;
480 if ((buf = qemu_opt_get(opts, "werror")) != NULL) {
481 on_write_error = parse_block_error_action(buf, 0, &error);
482 if (error) {
483 error_propagate(errp, error);
484 goto early_err;
485 }
486 }
487
488 on_read_error = BLOCKDEV_ON_ERROR_REPORT;
489 if ((buf = qemu_opt_get(opts, "rerror")) != NULL) {
490 on_read_error = parse_block_error_action(buf, 1, &error);
491 if (error) {
492 error_propagate(errp, error);
493 goto early_err;
494 }
495 }
496
497 detect_zeroes =
498 qapi_enum_parse(BlockdevDetectZeroesOptions_lookup,
499 qemu_opt_get(opts, "detect-zeroes"),
500 BLOCKDEV_DETECT_ZEROES_OPTIONS_MAX,
501 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF,
502 &error);
503 if (error) {
504 error_propagate(errp, error);
505 goto early_err;
506 }
507
508 if (detect_zeroes == BLOCKDEV_DETECT_ZEROES_OPTIONS_UNMAP &&
509 !(bdrv_flags & BDRV_O_UNMAP)) {
510 error_setg(errp, "setting detect-zeroes to unmap is not allowed "
511 "without setting discard operation to unmap");
512 goto early_err;
513 }
514
515 /* init */
516 if ((!file || !*file) && !has_driver_specific_opts) {
517 blk = blk_new_with_bs(qemu_opts_id(opts), errp);
518 if (!blk) {
519 goto early_err;
520 }
521
522 bs = blk_bs(blk);
523 bs->open_flags = snapshot ? BDRV_O_SNAPSHOT : 0;
524 bs->read_only = ro;
525
526 QDECREF(bs_opts);
527 } else {
528 if (file && !*file) {
529 file = NULL;
530 }
531
532 if (snapshot) {
533 /* always use cache=unsafe with snapshot */
534 bdrv_flags &= ~BDRV_O_CACHE_MASK;
535 bdrv_flags |= (BDRV_O_SNAPSHOT|BDRV_O_CACHE_WB|BDRV_O_NO_FLUSH);
536 }
537
538 if (copy_on_read) {
539 bdrv_flags |= BDRV_O_COPY_ON_READ;
540 }
541
542 if (runstate_check(RUN_STATE_INMIGRATE)) {
543 bdrv_flags |= BDRV_O_INCOMING;
544 }
545
546 bdrv_flags |= ro ? 0 : BDRV_O_RDWR;
547
548 blk = blk_new_open(qemu_opts_id(opts), file, NULL, bs_opts, bdrv_flags,
549 errp);
550 if (!blk) {
551 goto err_no_bs_opts;
552 }
553 bs = blk_bs(blk);
554 }
555
556 bs->detect_zeroes = detect_zeroes;
557
558 bdrv_set_on_error(bs, on_read_error, on_write_error);
559
560 /* disk I/O throttling */
561 if (throttle_enabled(&cfg)) {
562 if (!throttling_group) {
563 throttling_group = blk_name(blk);
564 }
565 bdrv_io_limits_enable(bs, throttling_group);
566 bdrv_set_io_limits(bs, &cfg);
567 }
568
569 if (bdrv_key_required(bs)) {
570 autostart = 0;
571 }
572
573 err_no_bs_opts:
574 qemu_opts_del(opts);
575 return blk;
576
577 early_err:
578 qemu_opts_del(opts);
579 err_no_opts:
580 QDECREF(bs_opts);
581 return NULL;
582 }
583
584 static void qemu_opt_rename(QemuOpts *opts, const char *from, const char *to,
585 Error **errp)
586 {
587 const char *value;
588
589 value = qemu_opt_get(opts, from);
590 if (value) {
591 if (qemu_opt_find(opts, to)) {
592 error_setg(errp, "'%s' and its alias '%s' can't be used at the "
593 "same time", to, from);
594 return;
595 }
596 }
597
598 /* rename all items in opts */
599 while ((value = qemu_opt_get(opts, from))) {
600 qemu_opt_set(opts, to, value, &error_abort);
601 qemu_opt_unset(opts, from);
602 }
603 }
604
605 QemuOptsList qemu_legacy_drive_opts = {
606 .name = "drive",
607 .head = QTAILQ_HEAD_INITIALIZER(qemu_legacy_drive_opts.head),
608 .desc = {
609 {
610 .name = "bus",
611 .type = QEMU_OPT_NUMBER,
612 .help = "bus number",
613 },{
614 .name = "unit",
615 .type = QEMU_OPT_NUMBER,
616 .help = "unit number (i.e. lun for scsi)",
617 },{
618 .name = "index",
619 .type = QEMU_OPT_NUMBER,
620 .help = "index number",
621 },{
622 .name = "media",
623 .type = QEMU_OPT_STRING,
624 .help = "media type (disk, cdrom)",
625 },{
626 .name = "if",
627 .type = QEMU_OPT_STRING,
628 .help = "interface (ide, scsi, sd, mtd, floppy, pflash, virtio)",
629 },{
630 .name = "cyls",
631 .type = QEMU_OPT_NUMBER,
632 .help = "number of cylinders (ide disk geometry)",
633 },{
634 .name = "heads",
635 .type = QEMU_OPT_NUMBER,
636 .help = "number of heads (ide disk geometry)",
637 },{
638 .name = "secs",
639 .type = QEMU_OPT_NUMBER,
640 .help = "number of sectors (ide disk geometry)",
641 },{
642 .name = "trans",
643 .type = QEMU_OPT_STRING,
644 .help = "chs translation (auto, lba, none)",
645 },{
646 .name = "boot",
647 .type = QEMU_OPT_BOOL,
648 .help = "(deprecated, ignored)",
649 },{
650 .name = "addr",
651 .type = QEMU_OPT_STRING,
652 .help = "pci address (virtio only)",
653 },{
654 .name = "serial",
655 .type = QEMU_OPT_STRING,
656 .help = "disk serial number",
657 },{
658 .name = "file",
659 .type = QEMU_OPT_STRING,
660 .help = "file name",
661 },
662
663 /* Options that are passed on, but have special semantics with -drive */
664 {
665 .name = "read-only",
666 .type = QEMU_OPT_BOOL,
667 .help = "open drive file as read-only",
668 },{
669 .name = "rerror",
670 .type = QEMU_OPT_STRING,
671 .help = "read error action",
672 },{
673 .name = "werror",
674 .type = QEMU_OPT_STRING,
675 .help = "write error action",
676 },{
677 .name = "copy-on-read",
678 .type = QEMU_OPT_BOOL,
679 .help = "copy read data from backing file into image file",
680 },
681
682 { /* end of list */ }
683 },
684 };
685
686 DriveInfo *drive_new(QemuOpts *all_opts, BlockInterfaceType block_default_type)
687 {
688 const char *value;
689 BlockBackend *blk;
690 DriveInfo *dinfo = NULL;
691 QDict *bs_opts;
692 QemuOpts *legacy_opts;
693 DriveMediaType media = MEDIA_DISK;
694 BlockInterfaceType type;
695 int cyls, heads, secs, translation;
696 int max_devs, bus_id, unit_id, index;
697 const char *devaddr;
698 const char *werror, *rerror;
699 bool read_only = false;
700 bool copy_on_read;
701 const char *serial;
702 const char *filename;
703 Error *local_err = NULL;
704 int i;
705
706 /* Change legacy command line options into QMP ones */
707 static const struct {
708 const char *from;
709 const char *to;
710 } opt_renames[] = {
711 { "iops", "throttling.iops-total" },
712 { "iops_rd", "throttling.iops-read" },
713 { "iops_wr", "throttling.iops-write" },
714
715 { "bps", "throttling.bps-total" },
716 { "bps_rd", "throttling.bps-read" },
717 { "bps_wr", "throttling.bps-write" },
718
719 { "iops_max", "throttling.iops-total-max" },
720 { "iops_rd_max", "throttling.iops-read-max" },
721 { "iops_wr_max", "throttling.iops-write-max" },
722
723 { "bps_max", "throttling.bps-total-max" },
724 { "bps_rd_max", "throttling.bps-read-max" },
725 { "bps_wr_max", "throttling.bps-write-max" },
726
727 { "iops_size", "throttling.iops-size" },
728
729 { "group", "throttling.group" },
730
731 { "readonly", "read-only" },
732 };
733
734 for (i = 0; i < ARRAY_SIZE(opt_renames); i++) {
735 qemu_opt_rename(all_opts, opt_renames[i].from, opt_renames[i].to,
736 &local_err);
737 if (local_err) {
738 error_report_err(local_err);
739 return NULL;
740 }
741 }
742
743 value = qemu_opt_get(all_opts, "cache");
744 if (value) {
745 int flags = 0;
746
747 if (bdrv_parse_cache_flags(value, &flags) != 0) {
748 error_report("invalid cache option");
749 return NULL;
750 }
751
752 /* Specific options take precedence */
753 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_WB)) {
754 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_WB,
755 !!(flags & BDRV_O_CACHE_WB), &error_abort);
756 }
757 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_DIRECT)) {
758 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_DIRECT,
759 !!(flags & BDRV_O_NOCACHE), &error_abort);
760 }
761 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_NO_FLUSH)) {
762 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_NO_FLUSH,
763 !!(flags & BDRV_O_NO_FLUSH), &error_abort);
764 }
765 qemu_opt_unset(all_opts, "cache");
766 }
767
768 /* Get a QDict for processing the options */
769 bs_opts = qdict_new();
770 qemu_opts_to_qdict(all_opts, bs_opts);
771
772 legacy_opts = qemu_opts_create(&qemu_legacy_drive_opts, NULL, 0,
773 &error_abort);
774 qemu_opts_absorb_qdict(legacy_opts, bs_opts, &local_err);
775 if (local_err) {
776 error_report_err(local_err);
777 goto fail;
778 }
779
780 /* Deprecated option boot=[on|off] */
781 if (qemu_opt_get(legacy_opts, "boot") != NULL) {
782 fprintf(stderr, "qemu-kvm: boot=on|off is deprecated and will be "
783 "ignored. Future versions will reject this parameter. Please "
784 "update your scripts.\n");
785 }
786
787 /* Media type */
788 value = qemu_opt_get(legacy_opts, "media");
789 if (value) {
790 if (!strcmp(value, "disk")) {
791 media = MEDIA_DISK;
792 } else if (!strcmp(value, "cdrom")) {
793 media = MEDIA_CDROM;
794 read_only = true;
795 } else {
796 error_report("'%s' invalid media", value);
797 goto fail;
798 }
799 }
800
801 /* copy-on-read is disabled with a warning for read-only devices */
802 read_only |= qemu_opt_get_bool(legacy_opts, "read-only", false);
803 copy_on_read = qemu_opt_get_bool(legacy_opts, "copy-on-read", false);
804
805 if (read_only && copy_on_read) {
806 error_report("warning: disabling copy-on-read on read-only drive");
807 copy_on_read = false;
808 }
809
810 qdict_put(bs_opts, "read-only",
811 qstring_from_str(read_only ? "on" : "off"));
812 qdict_put(bs_opts, "copy-on-read",
813 qstring_from_str(copy_on_read ? "on" :"off"));
814
815 /* Controller type */
816 value = qemu_opt_get(legacy_opts, "if");
817 if (value) {
818 for (type = 0;
819 type < IF_COUNT && strcmp(value, if_name[type]);
820 type++) {
821 }
822 if (type == IF_COUNT) {
823 error_report("unsupported bus type '%s'", value);
824 goto fail;
825 }
826 } else {
827 type = block_default_type;
828 }
829
830 /* Geometry */
831 cyls = qemu_opt_get_number(legacy_opts, "cyls", 0);
832 heads = qemu_opt_get_number(legacy_opts, "heads", 0);
833 secs = qemu_opt_get_number(legacy_opts, "secs", 0);
834
835 if (cyls || heads || secs) {
836 if (cyls < 1) {
837 error_report("invalid physical cyls number");
838 goto fail;
839 }
840 if (heads < 1) {
841 error_report("invalid physical heads number");
842 goto fail;
843 }
844 if (secs < 1) {
845 error_report("invalid physical secs number");
846 goto fail;
847 }
848 }
849
850 translation = BIOS_ATA_TRANSLATION_AUTO;
851 value = qemu_opt_get(legacy_opts, "trans");
852 if (value != NULL) {
853 if (!cyls) {
854 error_report("'%s' trans must be used with cyls, heads and secs",
855 value);
856 goto fail;
857 }
858 if (!strcmp(value, "none")) {
859 translation = BIOS_ATA_TRANSLATION_NONE;
860 } else if (!strcmp(value, "lba")) {
861 translation = BIOS_ATA_TRANSLATION_LBA;
862 } else if (!strcmp(value, "large")) {
863 translation = BIOS_ATA_TRANSLATION_LARGE;
864 } else if (!strcmp(value, "rechs")) {
865 translation = BIOS_ATA_TRANSLATION_RECHS;
866 } else if (!strcmp(value, "auto")) {
867 translation = BIOS_ATA_TRANSLATION_AUTO;
868 } else {
869 error_report("'%s' invalid translation type", value);
870 goto fail;
871 }
872 }
873
874 if (media == MEDIA_CDROM) {
875 if (cyls || secs || heads) {
876 error_report("CHS can't be set with media=cdrom");
877 goto fail;
878 }
879 }
880
881 /* Device address specified by bus/unit or index.
882 * If none was specified, try to find the first free one. */
883 bus_id = qemu_opt_get_number(legacy_opts, "bus", 0);
884 unit_id = qemu_opt_get_number(legacy_opts, "unit", -1);
885 index = qemu_opt_get_number(legacy_opts, "index", -1);
886
887 max_devs = if_max_devs[type];
888
889 if (index != -1) {
890 if (bus_id != 0 || unit_id != -1) {
891 error_report("index cannot be used with bus and unit");
892 goto fail;
893 }
894 bus_id = drive_index_to_bus_id(type, index);
895 unit_id = drive_index_to_unit_id(type, index);
896 }
897
898 if (unit_id == -1) {
899 unit_id = 0;
900 while (drive_get(type, bus_id, unit_id) != NULL) {
901 unit_id++;
902 if (max_devs && unit_id >= max_devs) {
903 unit_id -= max_devs;
904 bus_id++;
905 }
906 }
907 }
908
909 if (max_devs && unit_id >= max_devs) {
910 error_report("unit %d too big (max is %d)", unit_id, max_devs - 1);
911 goto fail;
912 }
913
914 if (drive_get(type, bus_id, unit_id) != NULL) {
915 error_report("drive with bus=%d, unit=%d (index=%d) exists",
916 bus_id, unit_id, index);
917 goto fail;
918 }
919
920 /* Serial number */
921 serial = qemu_opt_get(legacy_opts, "serial");
922
923 /* no id supplied -> create one */
924 if (qemu_opts_id(all_opts) == NULL) {
925 char *new_id;
926 const char *mediastr = "";
927 if (type == IF_IDE || type == IF_SCSI) {
928 mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd";
929 }
930 if (max_devs) {
931 new_id = g_strdup_printf("%s%i%s%i", if_name[type], bus_id,
932 mediastr, unit_id);
933 } else {
934 new_id = g_strdup_printf("%s%s%i", if_name[type],
935 mediastr, unit_id);
936 }
937 qdict_put(bs_opts, "id", qstring_from_str(new_id));
938 g_free(new_id);
939 }
940
941 /* Add virtio block device */
942 devaddr = qemu_opt_get(legacy_opts, "addr");
943 if (devaddr && type != IF_VIRTIO) {
944 error_report("addr is not supported by this bus type");
945 goto fail;
946 }
947
948 if (type == IF_VIRTIO) {
949 QemuOpts *devopts;
950 devopts = qemu_opts_create(qemu_find_opts("device"), NULL, 0,
951 &error_abort);
952 if (arch_type == QEMU_ARCH_S390X) {
953 qemu_opt_set(devopts, "driver", "virtio-blk-ccw", &error_abort);
954 } else {
955 qemu_opt_set(devopts, "driver", "virtio-blk-pci", &error_abort);
956 }
957 qemu_opt_set(devopts, "drive", qdict_get_str(bs_opts, "id"),
958 &error_abort);
959 if (devaddr) {
960 qemu_opt_set(devopts, "addr", devaddr, &error_abort);
961 }
962 }
963
964 filename = qemu_opt_get(legacy_opts, "file");
965
966 /* Check werror/rerror compatibility with if=... */
967 werror = qemu_opt_get(legacy_opts, "werror");
968 if (werror != NULL) {
969 if (type != IF_IDE && type != IF_SCSI && type != IF_VIRTIO &&
970 type != IF_NONE) {
971 error_report("werror is not supported by this bus type");
972 goto fail;
973 }
974 qdict_put(bs_opts, "werror", qstring_from_str(werror));
975 }
976
977 rerror = qemu_opt_get(legacy_opts, "rerror");
978 if (rerror != NULL) {
979 if (type != IF_IDE && type != IF_VIRTIO && type != IF_SCSI &&
980 type != IF_NONE) {
981 error_report("rerror is not supported by this bus type");
982 goto fail;
983 }
984 qdict_put(bs_opts, "rerror", qstring_from_str(rerror));
985 }
986
987 /* Actual block device init: Functionality shared with blockdev-add */
988 blk = blockdev_init(filename, bs_opts, &local_err);
989 bs_opts = NULL;
990 if (!blk) {
991 if (local_err) {
992 error_report_err(local_err);
993 }
994 goto fail;
995 } else {
996 assert(!local_err);
997 }
998
999 /* Create legacy DriveInfo */
1000 dinfo = g_malloc0(sizeof(*dinfo));
1001 dinfo->opts = all_opts;
1002
1003 dinfo->cyls = cyls;
1004 dinfo->heads = heads;
1005 dinfo->secs = secs;
1006 dinfo->trans = translation;
1007
1008 dinfo->type = type;
1009 dinfo->bus = bus_id;
1010 dinfo->unit = unit_id;
1011 dinfo->devaddr = devaddr;
1012 dinfo->serial = g_strdup(serial);
1013
1014 blk_set_legacy_dinfo(blk, dinfo);
1015
1016 switch(type) {
1017 case IF_IDE:
1018 case IF_SCSI:
1019 case IF_XEN:
1020 case IF_NONE:
1021 dinfo->media_cd = media == MEDIA_CDROM;
1022 break;
1023 default:
1024 break;
1025 }
1026
1027 fail:
1028 qemu_opts_del(legacy_opts);
1029 QDECREF(bs_opts);
1030 return dinfo;
1031 }
1032
1033 void hmp_commit(Monitor *mon, const QDict *qdict)
1034 {
1035 const char *device = qdict_get_str(qdict, "device");
1036 BlockBackend *blk;
1037 int ret;
1038
1039 if (!strcmp(device, "all")) {
1040 ret = bdrv_commit_all();
1041 } else {
1042 blk = blk_by_name(device);
1043 if (!blk) {
1044 monitor_printf(mon, "Device '%s' not found\n", device);
1045 return;
1046 }
1047 ret = bdrv_commit(blk_bs(blk));
1048 }
1049 if (ret < 0) {
1050 monitor_printf(mon, "'commit' error for '%s': %s\n", device,
1051 strerror(-ret));
1052 }
1053 }
1054
1055 static void blockdev_do_action(int kind, void *data, Error **errp)
1056 {
1057 TransactionAction action;
1058 TransactionActionList list;
1059
1060 action.kind = kind;
1061 action.data = data;
1062 list.value = &action;
1063 list.next = NULL;
1064 qmp_transaction(&list, errp);
1065 }
1066
1067 void qmp_blockdev_snapshot_sync(bool has_device, const char *device,
1068 bool has_node_name, const char *node_name,
1069 const char *snapshot_file,
1070 bool has_snapshot_node_name,
1071 const char *snapshot_node_name,
1072 bool has_format, const char *format,
1073 bool has_mode, NewImageMode mode, Error **errp)
1074 {
1075 BlockdevSnapshot snapshot = {
1076 .has_device = has_device,
1077 .device = (char *) device,
1078 .has_node_name = has_node_name,
1079 .node_name = (char *) node_name,
1080 .snapshot_file = (char *) snapshot_file,
1081 .has_snapshot_node_name = has_snapshot_node_name,
1082 .snapshot_node_name = (char *) snapshot_node_name,
1083 .has_format = has_format,
1084 .format = (char *) format,
1085 .has_mode = has_mode,
1086 .mode = mode,
1087 };
1088 blockdev_do_action(TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC,
1089 &snapshot, errp);
1090 }
1091
1092 void qmp_blockdev_snapshot_internal_sync(const char *device,
1093 const char *name,
1094 Error **errp)
1095 {
1096 BlockdevSnapshotInternal snapshot = {
1097 .device = (char *) device,
1098 .name = (char *) name
1099 };
1100
1101 blockdev_do_action(TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC,
1102 &snapshot, errp);
1103 }
1104
1105 SnapshotInfo *qmp_blockdev_snapshot_delete_internal_sync(const char *device,
1106 bool has_id,
1107 const char *id,
1108 bool has_name,
1109 const char *name,
1110 Error **errp)
1111 {
1112 BlockDriverState *bs;
1113 BlockBackend *blk;
1114 AioContext *aio_context;
1115 QEMUSnapshotInfo sn;
1116 Error *local_err = NULL;
1117 SnapshotInfo *info = NULL;
1118 int ret;
1119
1120 blk = blk_by_name(device);
1121 if (!blk) {
1122 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1123 "Device '%s' not found", device);
1124 return NULL;
1125 }
1126 bs = blk_bs(blk);
1127
1128 if (!has_id) {
1129 id = NULL;
1130 }
1131
1132 if (!has_name) {
1133 name = NULL;
1134 }
1135
1136 if (!id && !name) {
1137 error_setg(errp, "Name or id must be provided");
1138 return NULL;
1139 }
1140
1141 aio_context = bdrv_get_aio_context(bs);
1142 aio_context_acquire(aio_context);
1143
1144 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT_DELETE, errp)) {
1145 goto out_aio_context;
1146 }
1147
1148 ret = bdrv_snapshot_find_by_id_and_name(bs, id, name, &sn, &local_err);
1149 if (local_err) {
1150 error_propagate(errp, local_err);
1151 goto out_aio_context;
1152 }
1153 if (!ret) {
1154 error_setg(errp,
1155 "Snapshot with id '%s' and name '%s' does not exist on "
1156 "device '%s'",
1157 STR_OR_NULL(id), STR_OR_NULL(name), device);
1158 goto out_aio_context;
1159 }
1160
1161 bdrv_snapshot_delete(bs, id, name, &local_err);
1162 if (local_err) {
1163 error_propagate(errp, local_err);
1164 goto out_aio_context;
1165 }
1166
1167 aio_context_release(aio_context);
1168
1169 info = g_new0(SnapshotInfo, 1);
1170 info->id = g_strdup(sn.id_str);
1171 info->name = g_strdup(sn.name);
1172 info->date_nsec = sn.date_nsec;
1173 info->date_sec = sn.date_sec;
1174 info->vm_state_size = sn.vm_state_size;
1175 info->vm_clock_nsec = sn.vm_clock_nsec % 1000000000;
1176 info->vm_clock_sec = sn.vm_clock_nsec / 1000000000;
1177
1178 return info;
1179
1180 out_aio_context:
1181 aio_context_release(aio_context);
1182 return NULL;
1183 }
1184
1185 /**
1186 * block_dirty_bitmap_lookup:
1187 * Return a dirty bitmap (if present), after validating
1188 * the node reference and bitmap names.
1189 *
1190 * @node: The name of the BDS node to search for bitmaps
1191 * @name: The name of the bitmap to search for
1192 * @pbs: Output pointer for BDS lookup, if desired. Can be NULL.
1193 * @paio: Output pointer for aio_context acquisition, if desired. Can be NULL.
1194 * @errp: Output pointer for error information. Can be NULL.
1195 *
1196 * @return: A bitmap object on success, or NULL on failure.
1197 */
1198 static BdrvDirtyBitmap *block_dirty_bitmap_lookup(const char *node,
1199 const char *name,
1200 BlockDriverState **pbs,
1201 AioContext **paio,
1202 Error **errp)
1203 {
1204 BlockDriverState *bs;
1205 BdrvDirtyBitmap *bitmap;
1206 AioContext *aio_context;
1207
1208 if (!node) {
1209 error_setg(errp, "Node cannot be NULL");
1210 return NULL;
1211 }
1212 if (!name) {
1213 error_setg(errp, "Bitmap name cannot be NULL");
1214 return NULL;
1215 }
1216 bs = bdrv_lookup_bs(node, node, NULL);
1217 if (!bs) {
1218 error_setg(errp, "Node '%s' not found", node);
1219 return NULL;
1220 }
1221
1222 aio_context = bdrv_get_aio_context(bs);
1223 aio_context_acquire(aio_context);
1224
1225 bitmap = bdrv_find_dirty_bitmap(bs, name);
1226 if (!bitmap) {
1227 error_setg(errp, "Dirty bitmap '%s' not found", name);
1228 goto fail;
1229 }
1230
1231 if (pbs) {
1232 *pbs = bs;
1233 }
1234 if (paio) {
1235 *paio = aio_context;
1236 } else {
1237 aio_context_release(aio_context);
1238 }
1239
1240 return bitmap;
1241
1242 fail:
1243 aio_context_release(aio_context);
1244 return NULL;
1245 }
1246
1247 /* New and old BlockDriverState structs for atomic group operations */
1248
1249 typedef struct BlkTransactionState BlkTransactionState;
1250
1251 /* Only prepare() may fail. In a single transaction, only one of commit() or
1252 abort() will be called, clean() will always be called if it present. */
1253 typedef struct BdrvActionOps {
1254 /* Size of state struct, in bytes. */
1255 size_t instance_size;
1256 /* Prepare the work, must NOT be NULL. */
1257 void (*prepare)(BlkTransactionState *common, Error **errp);
1258 /* Commit the changes, can be NULL. */
1259 void (*commit)(BlkTransactionState *common);
1260 /* Abort the changes on fail, can be NULL. */
1261 void (*abort)(BlkTransactionState *common);
1262 /* Clean up resource in the end, can be NULL. */
1263 void (*clean)(BlkTransactionState *common);
1264 } BdrvActionOps;
1265
1266 /*
1267 * This structure must be arranged as first member in child type, assuming
1268 * that compiler will also arrange it to the same address with parent instance.
1269 * Later it will be used in free().
1270 */
1271 struct BlkTransactionState {
1272 TransactionAction *action;
1273 const BdrvActionOps *ops;
1274 QSIMPLEQ_ENTRY(BlkTransactionState) entry;
1275 };
1276
1277 /* internal snapshot private data */
1278 typedef struct InternalSnapshotState {
1279 BlkTransactionState common;
1280 BlockDriverState *bs;
1281 AioContext *aio_context;
1282 QEMUSnapshotInfo sn;
1283 } InternalSnapshotState;
1284
1285 static void internal_snapshot_prepare(BlkTransactionState *common,
1286 Error **errp)
1287 {
1288 Error *local_err = NULL;
1289 const char *device;
1290 const char *name;
1291 BlockBackend *blk;
1292 BlockDriverState *bs;
1293 QEMUSnapshotInfo old_sn, *sn;
1294 bool ret;
1295 qemu_timeval tv;
1296 BlockdevSnapshotInternal *internal;
1297 InternalSnapshotState *state;
1298 int ret1;
1299
1300 g_assert(common->action->kind ==
1301 TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC);
1302 internal = common->action->blockdev_snapshot_internal_sync;
1303 state = DO_UPCAST(InternalSnapshotState, common, common);
1304
1305 /* 1. parse input */
1306 device = internal->device;
1307 name = internal->name;
1308
1309 /* 2. check for validation */
1310 blk = blk_by_name(device);
1311 if (!blk) {
1312 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1313 "Device '%s' not found", device);
1314 return;
1315 }
1316 bs = blk_bs(blk);
1317
1318 /* AioContext is released in .clean() */
1319 state->aio_context = bdrv_get_aio_context(bs);
1320 aio_context_acquire(state->aio_context);
1321
1322 if (!bdrv_is_inserted(bs)) {
1323 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1324 return;
1325 }
1326
1327 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT, errp)) {
1328 return;
1329 }
1330
1331 if (bdrv_is_read_only(bs)) {
1332 error_setg(errp, "Device '%s' is read only", device);
1333 return;
1334 }
1335
1336 if (!bdrv_can_snapshot(bs)) {
1337 error_setg(errp, "Block format '%s' used by device '%s' "
1338 "does not support internal snapshots",
1339 bs->drv->format_name, device);
1340 return;
1341 }
1342
1343 if (!strlen(name)) {
1344 error_setg(errp, "Name is empty");
1345 return;
1346 }
1347
1348 /* check whether a snapshot with name exist */
1349 ret = bdrv_snapshot_find_by_id_and_name(bs, NULL, name, &old_sn,
1350 &local_err);
1351 if (local_err) {
1352 error_propagate(errp, local_err);
1353 return;
1354 } else if (ret) {
1355 error_setg(errp,
1356 "Snapshot with name '%s' already exists on device '%s'",
1357 name, device);
1358 return;
1359 }
1360
1361 /* 3. take the snapshot */
1362 sn = &state->sn;
1363 pstrcpy(sn->name, sizeof(sn->name), name);
1364 qemu_gettimeofday(&tv);
1365 sn->date_sec = tv.tv_sec;
1366 sn->date_nsec = tv.tv_usec * 1000;
1367 sn->vm_clock_nsec = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
1368
1369 ret1 = bdrv_snapshot_create(bs, sn);
1370 if (ret1 < 0) {
1371 error_setg_errno(errp, -ret1,
1372 "Failed to create snapshot '%s' on device '%s'",
1373 name, device);
1374 return;
1375 }
1376
1377 /* 4. succeed, mark a snapshot is created */
1378 state->bs = bs;
1379 }
1380
1381 static void internal_snapshot_abort(BlkTransactionState *common)
1382 {
1383 InternalSnapshotState *state =
1384 DO_UPCAST(InternalSnapshotState, common, common);
1385 BlockDriverState *bs = state->bs;
1386 QEMUSnapshotInfo *sn = &state->sn;
1387 Error *local_error = NULL;
1388
1389 if (!bs) {
1390 return;
1391 }
1392
1393 if (bdrv_snapshot_delete(bs, sn->id_str, sn->name, &local_error) < 0) {
1394 error_report("Failed to delete snapshot with id '%s' and name '%s' on "
1395 "device '%s' in abort: %s",
1396 sn->id_str,
1397 sn->name,
1398 bdrv_get_device_name(bs),
1399 error_get_pretty(local_error));
1400 error_free(local_error);
1401 }
1402 }
1403
1404 static void internal_snapshot_clean(BlkTransactionState *common)
1405 {
1406 InternalSnapshotState *state = DO_UPCAST(InternalSnapshotState,
1407 common, common);
1408
1409 if (state->aio_context) {
1410 aio_context_release(state->aio_context);
1411 }
1412 }
1413
1414 /* external snapshot private data */
1415 typedef struct ExternalSnapshotState {
1416 BlkTransactionState common;
1417 BlockDriverState *old_bs;
1418 BlockDriverState *new_bs;
1419 AioContext *aio_context;
1420 } ExternalSnapshotState;
1421
1422 static void external_snapshot_prepare(BlkTransactionState *common,
1423 Error **errp)
1424 {
1425 int flags, ret;
1426 QDict *options;
1427 Error *local_err = NULL;
1428 bool has_device = false;
1429 const char *device;
1430 bool has_node_name = false;
1431 const char *node_name;
1432 bool has_snapshot_node_name = false;
1433 const char *snapshot_node_name;
1434 const char *new_image_file;
1435 const char *format = "qcow2";
1436 enum NewImageMode mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
1437 ExternalSnapshotState *state =
1438 DO_UPCAST(ExternalSnapshotState, common, common);
1439 TransactionAction *action = common->action;
1440
1441 /* get parameters */
1442 g_assert(action->kind == TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC);
1443
1444 has_device = action->blockdev_snapshot_sync->has_device;
1445 device = action->blockdev_snapshot_sync->device;
1446 has_node_name = action->blockdev_snapshot_sync->has_node_name;
1447 node_name = action->blockdev_snapshot_sync->node_name;
1448 has_snapshot_node_name =
1449 action->blockdev_snapshot_sync->has_snapshot_node_name;
1450 snapshot_node_name = action->blockdev_snapshot_sync->snapshot_node_name;
1451
1452 new_image_file = action->blockdev_snapshot_sync->snapshot_file;
1453 if (action->blockdev_snapshot_sync->has_format) {
1454 format = action->blockdev_snapshot_sync->format;
1455 }
1456 if (action->blockdev_snapshot_sync->has_mode) {
1457 mode = action->blockdev_snapshot_sync->mode;
1458 }
1459
1460 /* start processing */
1461 state->old_bs = bdrv_lookup_bs(has_device ? device : NULL,
1462 has_node_name ? node_name : NULL,
1463 &local_err);
1464 if (local_err) {
1465 error_propagate(errp, local_err);
1466 return;
1467 }
1468
1469 if (has_node_name && !has_snapshot_node_name) {
1470 error_setg(errp, "New snapshot node name missing");
1471 return;
1472 }
1473
1474 if (has_snapshot_node_name && bdrv_find_node(snapshot_node_name)) {
1475 error_setg(errp, "New snapshot node name already existing");
1476 return;
1477 }
1478
1479 /* Acquire AioContext now so any threads operating on old_bs stop */
1480 state->aio_context = bdrv_get_aio_context(state->old_bs);
1481 aio_context_acquire(state->aio_context);
1482
1483 if (!bdrv_is_inserted(state->old_bs)) {
1484 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1485 return;
1486 }
1487
1488 if (bdrv_op_is_blocked(state->old_bs,
1489 BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT, errp)) {
1490 return;
1491 }
1492
1493 if (!bdrv_is_read_only(state->old_bs)) {
1494 if (bdrv_flush(state->old_bs)) {
1495 error_setg(errp, QERR_IO_ERROR);
1496 return;
1497 }
1498 }
1499
1500 if (!bdrv_is_first_non_filter(state->old_bs)) {
1501 error_setg(errp, QERR_FEATURE_DISABLED, "snapshot");
1502 return;
1503 }
1504
1505 flags = state->old_bs->open_flags;
1506
1507 /* create new image w/backing file */
1508 if (mode != NEW_IMAGE_MODE_EXISTING) {
1509 bdrv_img_create(new_image_file, format,
1510 state->old_bs->filename,
1511 state->old_bs->drv->format_name,
1512 NULL, -1, flags, &local_err, false);
1513 if (local_err) {
1514 error_propagate(errp, local_err);
1515 return;
1516 }
1517 }
1518
1519 options = qdict_new();
1520 if (has_snapshot_node_name) {
1521 qdict_put(options, "node-name",
1522 qstring_from_str(snapshot_node_name));
1523 }
1524 qdict_put(options, "driver", qstring_from_str(format));
1525
1526 /* TODO Inherit bs->options or only take explicit options with an
1527 * extended QMP command? */
1528 assert(state->new_bs == NULL);
1529 ret = bdrv_open(&state->new_bs, new_image_file, NULL, options,
1530 flags | BDRV_O_NO_BACKING, &local_err);
1531 /* We will manually add the backing_hd field to the bs later */
1532 if (ret != 0) {
1533 error_propagate(errp, local_err);
1534 }
1535 }
1536
1537 static void external_snapshot_commit(BlkTransactionState *common)
1538 {
1539 ExternalSnapshotState *state =
1540 DO_UPCAST(ExternalSnapshotState, common, common);
1541
1542 bdrv_set_aio_context(state->new_bs, state->aio_context);
1543
1544 /* This removes our old bs and adds the new bs */
1545 bdrv_append(state->new_bs, state->old_bs);
1546 /* We don't need (or want) to use the transactional
1547 * bdrv_reopen_multiple() across all the entries at once, because we
1548 * don't want to abort all of them if one of them fails the reopen */
1549 bdrv_reopen(state->new_bs, state->new_bs->open_flags & ~BDRV_O_RDWR,
1550 NULL);
1551
1552 aio_context_release(state->aio_context);
1553 }
1554
1555 static void external_snapshot_abort(BlkTransactionState *common)
1556 {
1557 ExternalSnapshotState *state =
1558 DO_UPCAST(ExternalSnapshotState, common, common);
1559 if (state->new_bs) {
1560 bdrv_unref(state->new_bs);
1561 }
1562 if (state->aio_context) {
1563 aio_context_release(state->aio_context);
1564 }
1565 }
1566
1567 typedef struct DriveBackupState {
1568 BlkTransactionState common;
1569 BlockDriverState *bs;
1570 AioContext *aio_context;
1571 BlockJob *job;
1572 } DriveBackupState;
1573
1574 static void drive_backup_prepare(BlkTransactionState *common, Error **errp)
1575 {
1576 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1577 BlockDriverState *bs;
1578 BlockBackend *blk;
1579 DriveBackup *backup;
1580 Error *local_err = NULL;
1581
1582 assert(common->action->kind == TRANSACTION_ACTION_KIND_DRIVE_BACKUP);
1583 backup = common->action->drive_backup;
1584
1585 blk = blk_by_name(backup->device);
1586 if (!blk) {
1587 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1588 "Device '%s' not found", backup->device);
1589 return;
1590 }
1591 bs = blk_bs(blk);
1592
1593 /* AioContext is released in .clean() */
1594 state->aio_context = bdrv_get_aio_context(bs);
1595 aio_context_acquire(state->aio_context);
1596
1597 qmp_drive_backup(backup->device, backup->target,
1598 backup->has_format, backup->format,
1599 backup->sync,
1600 backup->has_mode, backup->mode,
1601 backup->has_speed, backup->speed,
1602 backup->has_bitmap, backup->bitmap,
1603 backup->has_on_source_error, backup->on_source_error,
1604 backup->has_on_target_error, backup->on_target_error,
1605 &local_err);
1606 if (local_err) {
1607 error_propagate(errp, local_err);
1608 return;
1609 }
1610
1611 state->bs = bs;
1612 state->job = state->bs->job;
1613 }
1614
1615 static void drive_backup_abort(BlkTransactionState *common)
1616 {
1617 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1618 BlockDriverState *bs = state->bs;
1619
1620 /* Only cancel if it's the job we started */
1621 if (bs && bs->job && bs->job == state->job) {
1622 block_job_cancel_sync(bs->job);
1623 }
1624 }
1625
1626 static void drive_backup_clean(BlkTransactionState *common)
1627 {
1628 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1629
1630 if (state->aio_context) {
1631 aio_context_release(state->aio_context);
1632 }
1633 }
1634
1635 typedef struct BlockdevBackupState {
1636 BlkTransactionState common;
1637 BlockDriverState *bs;
1638 BlockJob *job;
1639 AioContext *aio_context;
1640 } BlockdevBackupState;
1641
1642 static void blockdev_backup_prepare(BlkTransactionState *common, Error **errp)
1643 {
1644 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
1645 BlockdevBackup *backup;
1646 BlockDriverState *bs, *target;
1647 BlockBackend *blk;
1648 Error *local_err = NULL;
1649
1650 assert(common->action->kind == TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP);
1651 backup = common->action->blockdev_backup;
1652
1653 blk = blk_by_name(backup->device);
1654 if (!blk) {
1655 error_setg(errp, "Device '%s' not found", backup->device);
1656 return;
1657 }
1658 bs = blk_bs(blk);
1659
1660 blk = blk_by_name(backup->target);
1661 if (!blk) {
1662 error_setg(errp, "Device '%s' not found", backup->target);
1663 return;
1664 }
1665 target = blk_bs(blk);
1666
1667 /* AioContext is released in .clean() */
1668 state->aio_context = bdrv_get_aio_context(bs);
1669 if (state->aio_context != bdrv_get_aio_context(target)) {
1670 state->aio_context = NULL;
1671 error_setg(errp, "Backup between two IO threads is not implemented");
1672 return;
1673 }
1674 aio_context_acquire(state->aio_context);
1675
1676 qmp_blockdev_backup(backup->device, backup->target,
1677 backup->sync,
1678 backup->has_speed, backup->speed,
1679 backup->has_on_source_error, backup->on_source_error,
1680 backup->has_on_target_error, backup->on_target_error,
1681 &local_err);
1682 if (local_err) {
1683 error_propagate(errp, local_err);
1684 return;
1685 }
1686
1687 state->bs = bs;
1688 state->job = state->bs->job;
1689 }
1690
1691 static void blockdev_backup_abort(BlkTransactionState *common)
1692 {
1693 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
1694 BlockDriverState *bs = state->bs;
1695
1696 /* Only cancel if it's the job we started */
1697 if (bs && bs->job && bs->job == state->job) {
1698 block_job_cancel_sync(bs->job);
1699 }
1700 }
1701
1702 static void blockdev_backup_clean(BlkTransactionState *common)
1703 {
1704 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
1705
1706 if (state->aio_context) {
1707 aio_context_release(state->aio_context);
1708 }
1709 }
1710
1711 static void abort_prepare(BlkTransactionState *common, Error **errp)
1712 {
1713 error_setg(errp, "Transaction aborted using Abort action");
1714 }
1715
1716 static void abort_commit(BlkTransactionState *common)
1717 {
1718 g_assert_not_reached(); /* this action never succeeds */
1719 }
1720
1721 static const BdrvActionOps actions[] = {
1722 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC] = {
1723 .instance_size = sizeof(ExternalSnapshotState),
1724 .prepare = external_snapshot_prepare,
1725 .commit = external_snapshot_commit,
1726 .abort = external_snapshot_abort,
1727 },
1728 [TRANSACTION_ACTION_KIND_DRIVE_BACKUP] = {
1729 .instance_size = sizeof(DriveBackupState),
1730 .prepare = drive_backup_prepare,
1731 .abort = drive_backup_abort,
1732 .clean = drive_backup_clean,
1733 },
1734 [TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP] = {
1735 .instance_size = sizeof(BlockdevBackupState),
1736 .prepare = blockdev_backup_prepare,
1737 .abort = blockdev_backup_abort,
1738 .clean = blockdev_backup_clean,
1739 },
1740 [TRANSACTION_ACTION_KIND_ABORT] = {
1741 .instance_size = sizeof(BlkTransactionState),
1742 .prepare = abort_prepare,
1743 .commit = abort_commit,
1744 },
1745 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC] = {
1746 .instance_size = sizeof(InternalSnapshotState),
1747 .prepare = internal_snapshot_prepare,
1748 .abort = internal_snapshot_abort,
1749 .clean = internal_snapshot_clean,
1750 },
1751 };
1752
1753 /*
1754 * 'Atomic' group operations. The operations are performed as a set, and if
1755 * any fail then we roll back all operations in the group.
1756 */
1757 void qmp_transaction(TransactionActionList *dev_list, Error **errp)
1758 {
1759 TransactionActionList *dev_entry = dev_list;
1760 BlkTransactionState *state, *next;
1761 Error *local_err = NULL;
1762
1763 QSIMPLEQ_HEAD(snap_bdrv_states, BlkTransactionState) snap_bdrv_states;
1764 QSIMPLEQ_INIT(&snap_bdrv_states);
1765
1766 /* drain all i/o before any operations */
1767 bdrv_drain_all();
1768
1769 /* We don't do anything in this loop that commits us to the operations */
1770 while (NULL != dev_entry) {
1771 TransactionAction *dev_info = NULL;
1772 const BdrvActionOps *ops;
1773
1774 dev_info = dev_entry->value;
1775 dev_entry = dev_entry->next;
1776
1777 assert(dev_info->kind < ARRAY_SIZE(actions));
1778
1779 ops = &actions[dev_info->kind];
1780 assert(ops->instance_size > 0);
1781
1782 state = g_malloc0(ops->instance_size);
1783 state->ops = ops;
1784 state->action = dev_info;
1785 QSIMPLEQ_INSERT_TAIL(&snap_bdrv_states, state, entry);
1786
1787 state->ops->prepare(state, &local_err);
1788 if (local_err) {
1789 error_propagate(errp, local_err);
1790 goto delete_and_fail;
1791 }
1792 }
1793
1794 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) {
1795 if (state->ops->commit) {
1796 state->ops->commit(state);
1797 }
1798 }
1799
1800 /* success */
1801 goto exit;
1802
1803 delete_and_fail:
1804 /* failure, and it is all-or-none; roll back all operations */
1805 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) {
1806 if (state->ops->abort) {
1807 state->ops->abort(state);
1808 }
1809 }
1810 exit:
1811 QSIMPLEQ_FOREACH_SAFE(state, &snap_bdrv_states, entry, next) {
1812 if (state->ops->clean) {
1813 state->ops->clean(state);
1814 }
1815 g_free(state);
1816 }
1817 }
1818
1819
1820 static void eject_device(BlockBackend *blk, int force, Error **errp)
1821 {
1822 BlockDriverState *bs = blk_bs(blk);
1823 AioContext *aio_context;
1824
1825 aio_context = bdrv_get_aio_context(bs);
1826 aio_context_acquire(aio_context);
1827
1828 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_EJECT, errp)) {
1829 goto out;
1830 }
1831 if (!blk_dev_has_removable_media(blk)) {
1832 error_setg(errp, "Device '%s' is not removable",
1833 bdrv_get_device_name(bs));
1834 goto out;
1835 }
1836
1837 if (blk_dev_is_medium_locked(blk) && !blk_dev_is_tray_open(blk)) {
1838 blk_dev_eject_request(blk, force);
1839 if (!force) {
1840 error_setg(errp, "Device '%s' is locked",
1841 bdrv_get_device_name(bs));
1842 goto out;
1843 }
1844 }
1845
1846 bdrv_close(bs);
1847
1848 out:
1849 aio_context_release(aio_context);
1850 }
1851
1852 void qmp_eject(const char *device, bool has_force, bool force, Error **errp)
1853 {
1854 BlockBackend *blk;
1855
1856 blk = blk_by_name(device);
1857 if (!blk) {
1858 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1859 "Device '%s' not found", device);
1860 return;
1861 }
1862
1863 eject_device(blk, force, errp);
1864 }
1865
1866 void qmp_block_passwd(bool has_device, const char *device,
1867 bool has_node_name, const char *node_name,
1868 const char *password, Error **errp)
1869 {
1870 Error *local_err = NULL;
1871 BlockDriverState *bs;
1872 AioContext *aio_context;
1873
1874 bs = bdrv_lookup_bs(has_device ? device : NULL,
1875 has_node_name ? node_name : NULL,
1876 &local_err);
1877 if (local_err) {
1878 error_propagate(errp, local_err);
1879 return;
1880 }
1881
1882 aio_context = bdrv_get_aio_context(bs);
1883 aio_context_acquire(aio_context);
1884
1885 bdrv_add_key(bs, password, errp);
1886
1887 aio_context_release(aio_context);
1888 }
1889
1890 /* Assumes AioContext is held */
1891 static void qmp_bdrv_open_encrypted(BlockDriverState *bs, const char *filename,
1892 int bdrv_flags, const char *format,
1893 const char *password, Error **errp)
1894 {
1895 Error *local_err = NULL;
1896 QDict *options = NULL;
1897 int ret;
1898
1899 if (format) {
1900 options = qdict_new();
1901 qdict_put(options, "driver", qstring_from_str(format));
1902 }
1903
1904 ret = bdrv_open(&bs, filename, NULL, options, bdrv_flags, &local_err);
1905 if (ret < 0) {
1906 error_propagate(errp, local_err);
1907 return;
1908 }
1909
1910 bdrv_add_key(bs, password, errp);
1911 }
1912
1913 void qmp_change_blockdev(const char *device, const char *filename,
1914 const char *format, Error **errp)
1915 {
1916 BlockBackend *blk;
1917 BlockDriverState *bs;
1918 AioContext *aio_context;
1919 int bdrv_flags;
1920 Error *err = NULL;
1921
1922 blk = blk_by_name(device);
1923 if (!blk) {
1924 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1925 "Device '%s' not found", device);
1926 return;
1927 }
1928 bs = blk_bs(blk);
1929
1930 aio_context = bdrv_get_aio_context(bs);
1931 aio_context_acquire(aio_context);
1932
1933 eject_device(blk, 0, &err);
1934 if (err) {
1935 error_propagate(errp, err);
1936 goto out;
1937 }
1938
1939 bdrv_flags = bdrv_is_read_only(bs) ? 0 : BDRV_O_RDWR;
1940 bdrv_flags |= bdrv_is_snapshot(bs) ? BDRV_O_SNAPSHOT : 0;
1941
1942 qmp_bdrv_open_encrypted(bs, filename, bdrv_flags, format, NULL, errp);
1943
1944 out:
1945 aio_context_release(aio_context);
1946 }
1947
1948 /* throttling disk I/O limits */
1949 void qmp_block_set_io_throttle(const char *device, int64_t bps, int64_t bps_rd,
1950 int64_t bps_wr,
1951 int64_t iops,
1952 int64_t iops_rd,
1953 int64_t iops_wr,
1954 bool has_bps_max,
1955 int64_t bps_max,
1956 bool has_bps_rd_max,
1957 int64_t bps_rd_max,
1958 bool has_bps_wr_max,
1959 int64_t bps_wr_max,
1960 bool has_iops_max,
1961 int64_t iops_max,
1962 bool has_iops_rd_max,
1963 int64_t iops_rd_max,
1964 bool has_iops_wr_max,
1965 int64_t iops_wr_max,
1966 bool has_iops_size,
1967 int64_t iops_size,
1968 bool has_group,
1969 const char *group, Error **errp)
1970 {
1971 ThrottleConfig cfg;
1972 BlockDriverState *bs;
1973 BlockBackend *blk;
1974 AioContext *aio_context;
1975
1976 blk = blk_by_name(device);
1977 if (!blk) {
1978 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1979 "Device '%s' not found", device);
1980 return;
1981 }
1982 bs = blk_bs(blk);
1983
1984 memset(&cfg, 0, sizeof(cfg));
1985 cfg.buckets[THROTTLE_BPS_TOTAL].avg = bps;
1986 cfg.buckets[THROTTLE_BPS_READ].avg = bps_rd;
1987 cfg.buckets[THROTTLE_BPS_WRITE].avg = bps_wr;
1988
1989 cfg.buckets[THROTTLE_OPS_TOTAL].avg = iops;
1990 cfg.buckets[THROTTLE_OPS_READ].avg = iops_rd;
1991 cfg.buckets[THROTTLE_OPS_WRITE].avg = iops_wr;
1992
1993 if (has_bps_max) {
1994 cfg.buckets[THROTTLE_BPS_TOTAL].max = bps_max;
1995 }
1996 if (has_bps_rd_max) {
1997 cfg.buckets[THROTTLE_BPS_READ].max = bps_rd_max;
1998 }
1999 if (has_bps_wr_max) {
2000 cfg.buckets[THROTTLE_BPS_WRITE].max = bps_wr_max;
2001 }
2002 if (has_iops_max) {
2003 cfg.buckets[THROTTLE_OPS_TOTAL].max = iops_max;
2004 }
2005 if (has_iops_rd_max) {
2006 cfg.buckets[THROTTLE_OPS_READ].max = iops_rd_max;
2007 }
2008 if (has_iops_wr_max) {
2009 cfg.buckets[THROTTLE_OPS_WRITE].max = iops_wr_max;
2010 }
2011
2012 if (has_iops_size) {
2013 cfg.op_size = iops_size;
2014 }
2015
2016 if (!check_throttle_config(&cfg, errp)) {
2017 return;
2018 }
2019
2020 aio_context = bdrv_get_aio_context(bs);
2021 aio_context_acquire(aio_context);
2022
2023 if (throttle_enabled(&cfg)) {
2024 /* Enable I/O limits if they're not enabled yet, otherwise
2025 * just update the throttling group. */
2026 if (!bs->io_limits_enabled) {
2027 bdrv_io_limits_enable(bs, has_group ? group : device);
2028 } else if (has_group) {
2029 bdrv_io_limits_update_group(bs, group);
2030 }
2031 /* Set the new throttling configuration */
2032 bdrv_set_io_limits(bs, &cfg);
2033 } else if (bs->io_limits_enabled) {
2034 /* If all throttling settings are set to 0, disable I/O limits */
2035 bdrv_io_limits_disable(bs);
2036 }
2037
2038 aio_context_release(aio_context);
2039 }
2040
2041 void qmp_block_dirty_bitmap_add(const char *node, const char *name,
2042 bool has_granularity, uint32_t granularity,
2043 Error **errp)
2044 {
2045 AioContext *aio_context;
2046 BlockDriverState *bs;
2047
2048 if (!name || name[0] == '\0') {
2049 error_setg(errp, "Bitmap name cannot be empty");
2050 return;
2051 }
2052
2053 bs = bdrv_lookup_bs(node, node, errp);
2054 if (!bs) {
2055 return;
2056 }
2057
2058 aio_context = bdrv_get_aio_context(bs);
2059 aio_context_acquire(aio_context);
2060
2061 if (has_granularity) {
2062 if (granularity < 512 || !is_power_of_2(granularity)) {
2063 error_setg(errp, "Granularity must be power of 2 "
2064 "and at least 512");
2065 goto out;
2066 }
2067 } else {
2068 /* Default to cluster size, if available: */
2069 granularity = bdrv_get_default_bitmap_granularity(bs);
2070 }
2071
2072 bdrv_create_dirty_bitmap(bs, granularity, name, errp);
2073
2074 out:
2075 aio_context_release(aio_context);
2076 }
2077
2078 void qmp_block_dirty_bitmap_remove(const char *node, const char *name,
2079 Error **errp)
2080 {
2081 AioContext *aio_context;
2082 BlockDriverState *bs;
2083 BdrvDirtyBitmap *bitmap;
2084
2085 bitmap = block_dirty_bitmap_lookup(node, name, &bs, &aio_context, errp);
2086 if (!bitmap || !bs) {
2087 return;
2088 }
2089
2090 if (bdrv_dirty_bitmap_frozen(bitmap)) {
2091 error_setg(errp,
2092 "Bitmap '%s' is currently frozen and cannot be removed",
2093 name);
2094 goto out;
2095 }
2096 bdrv_dirty_bitmap_make_anon(bitmap);
2097 bdrv_release_dirty_bitmap(bs, bitmap);
2098
2099 out:
2100 aio_context_release(aio_context);
2101 }
2102
2103 /**
2104 * Completely clear a bitmap, for the purposes of synchronizing a bitmap
2105 * immediately after a full backup operation.
2106 */
2107 void qmp_block_dirty_bitmap_clear(const char *node, const char *name,
2108 Error **errp)
2109 {
2110 AioContext *aio_context;
2111 BdrvDirtyBitmap *bitmap;
2112 BlockDriverState *bs;
2113
2114 bitmap = block_dirty_bitmap_lookup(node, name, &bs, &aio_context, errp);
2115 if (!bitmap || !bs) {
2116 return;
2117 }
2118
2119 if (bdrv_dirty_bitmap_frozen(bitmap)) {
2120 error_setg(errp,
2121 "Bitmap '%s' is currently frozen and cannot be modified",
2122 name);
2123 goto out;
2124 } else if (!bdrv_dirty_bitmap_enabled(bitmap)) {
2125 error_setg(errp,
2126 "Bitmap '%s' is currently disabled and cannot be cleared",
2127 name);
2128 goto out;
2129 }
2130
2131 bdrv_clear_dirty_bitmap(bitmap);
2132
2133 out:
2134 aio_context_release(aio_context);
2135 }
2136
2137 void hmp_drive_del(Monitor *mon, const QDict *qdict)
2138 {
2139 const char *id = qdict_get_str(qdict, "id");
2140 BlockBackend *blk;
2141 BlockDriverState *bs;
2142 AioContext *aio_context;
2143 Error *local_err = NULL;
2144
2145 blk = blk_by_name(id);
2146 if (!blk) {
2147 error_report("Device '%s' not found", id);
2148 return;
2149 }
2150 bs = blk_bs(blk);
2151
2152 if (!blk_legacy_dinfo(blk)) {
2153 error_report("Deleting device added with blockdev-add"
2154 " is not supported");
2155 return;
2156 }
2157
2158 aio_context = bdrv_get_aio_context(bs);
2159 aio_context_acquire(aio_context);
2160
2161 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_DRIVE_DEL, &local_err)) {
2162 error_report_err(local_err);
2163 aio_context_release(aio_context);
2164 return;
2165 }
2166
2167 bdrv_close(bs);
2168
2169 /* if we have a device attached to this BlockDriverState
2170 * then we need to make the drive anonymous until the device
2171 * can be removed. If this is a drive with no device backing
2172 * then we can just get rid of the block driver state right here.
2173 */
2174 if (blk_get_attached_dev(blk)) {
2175 blk_hide_on_behalf_of_hmp_drive_del(blk);
2176 /* Further I/O must not pause the guest */
2177 bdrv_set_on_error(bs, BLOCKDEV_ON_ERROR_REPORT,
2178 BLOCKDEV_ON_ERROR_REPORT);
2179 } else {
2180 blk_unref(blk);
2181 }
2182
2183 aio_context_release(aio_context);
2184 }
2185
2186 void qmp_block_resize(bool has_device, const char *device,
2187 bool has_node_name, const char *node_name,
2188 int64_t size, Error **errp)
2189 {
2190 Error *local_err = NULL;
2191 BlockDriverState *bs;
2192 AioContext *aio_context;
2193 int ret;
2194
2195 bs = bdrv_lookup_bs(has_device ? device : NULL,
2196 has_node_name ? node_name : NULL,
2197 &local_err);
2198 if (local_err) {
2199 error_propagate(errp, local_err);
2200 return;
2201 }
2202
2203 aio_context = bdrv_get_aio_context(bs);
2204 aio_context_acquire(aio_context);
2205
2206 if (!bdrv_is_first_non_filter(bs)) {
2207 error_setg(errp, QERR_FEATURE_DISABLED, "resize");
2208 goto out;
2209 }
2210
2211 if (size < 0) {
2212 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size");
2213 goto out;
2214 }
2215
2216 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_RESIZE, NULL)) {
2217 error_setg(errp, QERR_DEVICE_IN_USE, device);
2218 goto out;
2219 }
2220
2221 /* complete all in-flight operations before resizing the device */
2222 bdrv_drain_all();
2223
2224 ret = bdrv_truncate(bs, size);
2225 switch (ret) {
2226 case 0:
2227 break;
2228 case -ENOMEDIUM:
2229 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
2230 break;
2231 case -ENOTSUP:
2232 error_setg(errp, QERR_UNSUPPORTED);
2233 break;
2234 case -EACCES:
2235 error_setg(errp, "Device '%s' is read only", device);
2236 break;
2237 case -EBUSY:
2238 error_setg(errp, QERR_DEVICE_IN_USE, device);
2239 break;
2240 default:
2241 error_setg_errno(errp, -ret, "Could not resize");
2242 break;
2243 }
2244
2245 out:
2246 aio_context_release(aio_context);
2247 }
2248
2249 static void block_job_cb(void *opaque, int ret)
2250 {
2251 /* Note that this function may be executed from another AioContext besides
2252 * the QEMU main loop. If you need to access anything that assumes the
2253 * QEMU global mutex, use a BH or introduce a mutex.
2254 */
2255
2256 BlockDriverState *bs = opaque;
2257 const char *msg = NULL;
2258
2259 trace_block_job_cb(bs, bs->job, ret);
2260
2261 assert(bs->job);
2262
2263 if (ret < 0) {
2264 msg = strerror(-ret);
2265 }
2266
2267 if (block_job_is_cancelled(bs->job)) {
2268 block_job_event_cancelled(bs->job);
2269 } else {
2270 block_job_event_completed(bs->job, msg);
2271 }
2272
2273 bdrv_put_ref_bh_schedule(bs);
2274 }
2275
2276 void qmp_block_stream(const char *device,
2277 bool has_base, const char *base,
2278 bool has_backing_file, const char *backing_file,
2279 bool has_speed, int64_t speed,
2280 bool has_on_error, BlockdevOnError on_error,
2281 Error **errp)
2282 {
2283 BlockBackend *blk;
2284 BlockDriverState *bs;
2285 BlockDriverState *base_bs = NULL;
2286 AioContext *aio_context;
2287 Error *local_err = NULL;
2288 const char *base_name = NULL;
2289
2290 if (!has_on_error) {
2291 on_error = BLOCKDEV_ON_ERROR_REPORT;
2292 }
2293
2294 blk = blk_by_name(device);
2295 if (!blk) {
2296 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
2297 "Device '%s' not found", device);
2298 return;
2299 }
2300 bs = blk_bs(blk);
2301
2302 aio_context = bdrv_get_aio_context(bs);
2303 aio_context_acquire(aio_context);
2304
2305 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_STREAM, errp)) {
2306 goto out;
2307 }
2308
2309 if (has_base) {
2310 base_bs = bdrv_find_backing_image(bs, base);
2311 if (base_bs == NULL) {
2312 error_setg(errp, QERR_BASE_NOT_FOUND, base);
2313 goto out;
2314 }
2315 assert(bdrv_get_aio_context(base_bs) == aio_context);
2316 base_name = base;
2317 }
2318
2319 /* if we are streaming the entire chain, the result will have no backing
2320 * file, and specifying one is therefore an error */
2321 if (base_bs == NULL && has_backing_file) {
2322 error_setg(errp, "backing file specified, but streaming the "
2323 "entire chain");
2324 goto out;
2325 }
2326
2327 /* backing_file string overrides base bs filename */
2328 base_name = has_backing_file ? backing_file : base_name;
2329
2330 stream_start(bs, base_bs, base_name, has_speed ? speed : 0,
2331 on_error, block_job_cb, bs, &local_err);
2332 if (local_err) {
2333 error_propagate(errp, local_err);
2334 goto out;
2335 }
2336
2337 trace_qmp_block_stream(bs, bs->job);
2338
2339 out:
2340 aio_context_release(aio_context);
2341 }
2342
2343 void qmp_block_commit(const char *device,
2344 bool has_base, const char *base,
2345 bool has_top, const char *top,
2346 bool has_backing_file, const char *backing_file,
2347 bool has_speed, int64_t speed,
2348 Error **errp)
2349 {
2350 BlockBackend *blk;
2351 BlockDriverState *bs;
2352 BlockDriverState *base_bs, *top_bs;
2353 AioContext *aio_context;
2354 Error *local_err = NULL;
2355 /* This will be part of the QMP command, if/when the
2356 * BlockdevOnError change for blkmirror makes it in
2357 */
2358 BlockdevOnError on_error = BLOCKDEV_ON_ERROR_REPORT;
2359
2360 if (!has_speed) {
2361 speed = 0;
2362 }
2363
2364 /* Important Note:
2365 * libvirt relies on the DeviceNotFound error class in order to probe for
2366 * live commit feature versions; for this to work, we must make sure to
2367 * perform the device lookup before any generic errors that may occur in a
2368 * scenario in which all optional arguments are omitted. */
2369 blk = blk_by_name(device);
2370 if (!blk) {
2371 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
2372 "Device '%s' not found", device);
2373 return;
2374 }
2375 bs = blk_bs(blk);
2376
2377 aio_context = bdrv_get_aio_context(bs);
2378 aio_context_acquire(aio_context);
2379
2380 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_COMMIT_SOURCE, errp)) {
2381 goto out;
2382 }
2383
2384 /* default top_bs is the active layer */
2385 top_bs = bs;
2386
2387 if (has_top && top) {
2388 if (strcmp(bs->filename, top) != 0) {
2389 top_bs = bdrv_find_backing_image(bs, top);
2390 }
2391 }
2392
2393 if (top_bs == NULL) {
2394 error_setg(errp, "Top image file %s not found", top ? top : "NULL");
2395 goto out;
2396 }
2397
2398 assert(bdrv_get_aio_context(top_bs) == aio_context);
2399
2400 if (has_base && base) {
2401 base_bs = bdrv_find_backing_image(top_bs, base);
2402 } else {
2403 base_bs = bdrv_find_base(top_bs);
2404 }
2405
2406 if (base_bs == NULL) {
2407 error_setg(errp, QERR_BASE_NOT_FOUND, base ? base : "NULL");
2408 goto out;
2409 }
2410
2411 assert(bdrv_get_aio_context(base_bs) == aio_context);
2412
2413 if (bdrv_op_is_blocked(base_bs, BLOCK_OP_TYPE_COMMIT_TARGET, errp)) {
2414 goto out;
2415 }
2416
2417 /* Do not allow attempts to commit an image into itself */
2418 if (top_bs == base_bs) {
2419 error_setg(errp, "cannot commit an image into itself");
2420 goto out;
2421 }
2422
2423 if (top_bs == bs) {
2424 if (has_backing_file) {
2425 error_setg(errp, "'backing-file' specified,"
2426 " but 'top' is the active layer");
2427 goto out;
2428 }
2429 commit_active_start(bs, base_bs, speed, on_error, block_job_cb,
2430 bs, &local_err);
2431 } else {
2432 commit_start(bs, base_bs, top_bs, speed, on_error, block_job_cb, bs,
2433 has_backing_file ? backing_file : NULL, &local_err);
2434 }
2435 if (local_err != NULL) {
2436 error_propagate(errp, local_err);
2437 goto out;
2438 }
2439
2440 out:
2441 aio_context_release(aio_context);
2442 }
2443
2444 void qmp_drive_backup(const char *device, const char *target,
2445 bool has_format, const char *format,
2446 enum MirrorSyncMode sync,
2447 bool has_mode, enum NewImageMode mode,
2448 bool has_speed, int64_t speed,
2449 bool has_bitmap, const char *bitmap,
2450 bool has_on_source_error, BlockdevOnError on_source_error,
2451 bool has_on_target_error, BlockdevOnError on_target_error,
2452 Error **errp)
2453 {
2454 BlockBackend *blk;
2455 BlockDriverState *bs;
2456 BlockDriverState *target_bs;
2457 BlockDriverState *source = NULL;
2458 BdrvDirtyBitmap *bmap = NULL;
2459 AioContext *aio_context;
2460 QDict *options = NULL;
2461 Error *local_err = NULL;
2462 int flags;
2463 int64_t size;
2464 int ret;
2465
2466 if (!has_speed) {
2467 speed = 0;
2468 }
2469 if (!has_on_source_error) {
2470 on_source_error = BLOCKDEV_ON_ERROR_REPORT;
2471 }
2472 if (!has_on_target_error) {
2473 on_target_error = BLOCKDEV_ON_ERROR_REPORT;
2474 }
2475 if (!has_mode) {
2476 mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
2477 }
2478
2479 blk = blk_by_name(device);
2480 if (!blk) {
2481 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
2482 "Device '%s' not found", device);
2483 return;
2484 }
2485 bs = blk_bs(blk);
2486
2487 aio_context = bdrv_get_aio_context(bs);
2488 aio_context_acquire(aio_context);
2489
2490 /* Although backup_run has this check too, we need to use bs->drv below, so
2491 * do an early check redundantly. */
2492 if (!bdrv_is_inserted(bs)) {
2493 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
2494 goto out;
2495 }
2496
2497 if (!has_format) {
2498 format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name;
2499 }
2500
2501 /* Early check to avoid creating target */
2502 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_BACKUP_SOURCE, errp)) {
2503 goto out;
2504 }
2505
2506 flags = bs->open_flags | BDRV_O_RDWR;
2507
2508 /* See if we have a backing HD we can use to create our new image
2509 * on top of. */
2510 if (sync == MIRROR_SYNC_MODE_TOP) {
2511 source = bs->backing_hd;
2512 if (!source) {
2513 sync = MIRROR_SYNC_MODE_FULL;
2514 }
2515 }
2516 if (sync == MIRROR_SYNC_MODE_NONE) {
2517 source = bs;
2518 }
2519
2520 size = bdrv_getlength(bs);
2521 if (size < 0) {
2522 error_setg_errno(errp, -size, "bdrv_getlength failed");
2523 goto out;
2524 }
2525
2526 if (mode != NEW_IMAGE_MODE_EXISTING) {
2527 assert(format);
2528 if (source) {
2529 bdrv_img_create(target, format, source->filename,
2530 source->drv->format_name, NULL,
2531 size, flags, &local_err, false);
2532 } else {
2533 bdrv_img_create(target, format, NULL, NULL, NULL,
2534 size, flags, &local_err, false);
2535 }
2536 }
2537
2538 if (local_err) {
2539 error_propagate(errp, local_err);
2540 goto out;
2541 }
2542
2543 if (format) {
2544 options = qdict_new();
2545 qdict_put(options, "driver", qstring_from_str(format));
2546 }
2547
2548 target_bs = NULL;
2549 ret = bdrv_open(&target_bs, target, NULL, options, flags, &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 void qmp_drive_mirror(const char *device, const char *target,
2638 bool has_format, const char *format,
2639 bool has_node_name, const char *node_name,
2640 bool has_replaces, const char *replaces,
2641 enum MirrorSyncMode sync,
2642 bool has_mode, enum NewImageMode mode,
2643 bool has_speed, int64_t speed,
2644 bool has_granularity, uint32_t granularity,
2645 bool has_buf_size, int64_t buf_size,
2646 bool has_on_source_error, BlockdevOnError on_source_error,
2647 bool has_on_target_error, BlockdevOnError on_target_error,
2648 bool has_unmap, bool unmap,
2649 Error **errp)
2650 {
2651 BlockBackend *blk;
2652 BlockDriverState *bs;
2653 BlockDriverState *source, *target_bs;
2654 AioContext *aio_context;
2655 Error *local_err = NULL;
2656 QDict *options;
2657 int flags;
2658 int64_t size;
2659 int ret;
2660
2661 if (!has_speed) {
2662 speed = 0;
2663 }
2664 if (!has_on_source_error) {
2665 on_source_error = BLOCKDEV_ON_ERROR_REPORT;
2666 }
2667 if (!has_on_target_error) {
2668 on_target_error = BLOCKDEV_ON_ERROR_REPORT;
2669 }
2670 if (!has_mode) {
2671 mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
2672 }
2673 if (!has_granularity) {
2674 granularity = 0;
2675 }
2676 if (!has_buf_size) {
2677 buf_size = 0;
2678 }
2679 if (!has_unmap) {
2680 unmap = true;
2681 }
2682
2683 if (granularity != 0 && (granularity < 512 || granularity > 1048576 * 64)) {
2684 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity",
2685 "a value in range [512B, 64MB]");
2686 return;
2687 }
2688 if (granularity & (granularity - 1)) {
2689 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity",
2690 "power of 2");
2691 return;
2692 }
2693
2694 blk = blk_by_name(device);
2695 if (!blk) {
2696 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
2697 "Device '%s' not found", device);
2698 return;
2699 }
2700 bs = blk_bs(blk);
2701
2702 aio_context = bdrv_get_aio_context(bs);
2703 aio_context_acquire(aio_context);
2704
2705 if (!bdrv_is_inserted(bs)) {
2706 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
2707 goto out;
2708 }
2709
2710 if (!has_format) {
2711 format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name;
2712 }
2713
2714 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_MIRROR, errp)) {
2715 goto out;
2716 }
2717
2718 flags = bs->open_flags | BDRV_O_RDWR;
2719 source = bs->backing_hd;
2720 if (!source && sync == MIRROR_SYNC_MODE_TOP) {
2721 sync = MIRROR_SYNC_MODE_FULL;
2722 }
2723 if (sync == MIRROR_SYNC_MODE_NONE) {
2724 source = bs;
2725 }
2726
2727 size = bdrv_getlength(bs);
2728 if (size < 0) {
2729 error_setg_errno(errp, -size, "bdrv_getlength failed");
2730 goto out;
2731 }
2732
2733 if (has_replaces) {
2734 BlockDriverState *to_replace_bs;
2735 AioContext *replace_aio_context;
2736 int64_t replace_size;
2737
2738 if (!has_node_name) {
2739 error_setg(errp, "a node-name must be provided when replacing a"
2740 " named node of the graph");
2741 goto out;
2742 }
2743
2744 to_replace_bs = check_to_replace_node(bs, replaces, &local_err);
2745
2746 if (!to_replace_bs) {
2747 error_propagate(errp, local_err);
2748 goto out;
2749 }
2750
2751 replace_aio_context = bdrv_get_aio_context(to_replace_bs);
2752 aio_context_acquire(replace_aio_context);
2753 replace_size = bdrv_getlength(to_replace_bs);
2754 aio_context_release(replace_aio_context);
2755
2756 if (size != replace_size) {
2757 error_setg(errp, "cannot replace image with a mirror image of "
2758 "different size");
2759 goto out;
2760 }
2761 }
2762
2763 if ((sync == MIRROR_SYNC_MODE_FULL || !source)
2764 && mode != NEW_IMAGE_MODE_EXISTING)
2765 {
2766 /* create new image w/o backing file */
2767 assert(format);
2768 bdrv_img_create(target, format,
2769 NULL, NULL, NULL, size, flags, &local_err, false);
2770 } else {
2771 switch (mode) {
2772 case NEW_IMAGE_MODE_EXISTING:
2773 break;
2774 case NEW_IMAGE_MODE_ABSOLUTE_PATHS:
2775 /* create new image with backing file */
2776 bdrv_img_create(target, format,
2777 source->filename,
2778 source->drv->format_name,
2779 NULL, size, flags, &local_err, false);
2780 break;
2781 default:
2782 abort();
2783 }
2784 }
2785
2786 if (local_err) {
2787 error_propagate(errp, local_err);
2788 goto out;
2789 }
2790
2791 options = qdict_new();
2792 if (has_node_name) {
2793 qdict_put(options, "node-name", qstring_from_str(node_name));
2794 }
2795 if (format) {
2796 qdict_put(options, "driver", qstring_from_str(format));
2797 }
2798
2799 /* Mirroring takes care of copy-on-write using the source's backing
2800 * file.
2801 */
2802 target_bs = NULL;
2803 ret = bdrv_open(&target_bs, target, NULL, options,
2804 flags | BDRV_O_NO_BACKING, &local_err);
2805 if (ret < 0) {
2806 error_propagate(errp, local_err);
2807 goto out;
2808 }
2809
2810 bdrv_set_aio_context(target_bs, aio_context);
2811
2812 /* pass the node name to replace to mirror start since it's loose coupling
2813 * and will allow to check whether the node still exist at mirror completion
2814 */
2815 mirror_start(bs, target_bs,
2816 has_replaces ? replaces : NULL,
2817 speed, granularity, buf_size, sync,
2818 on_source_error, on_target_error,
2819 unmap,
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, ERROR_CLASS_DEVICE_NOT_FOUND,
2961 "Device '%s' not found", device);
2962 return;
2963 }
2964 bs = blk_bs(blk);
2965
2966 aio_context = bdrv_get_aio_context(bs);
2967 aio_context_acquire(aio_context);
2968
2969 image_bs = bdrv_lookup_bs(NULL, image_node_name, &local_err);
2970 if (local_err) {
2971 error_propagate(errp, local_err);
2972 goto out;
2973 }
2974
2975 if (!image_bs) {
2976 error_setg(errp, "image file not found");
2977 goto out;
2978 }
2979
2980 if (bdrv_find_base(image_bs) == image_bs) {
2981 error_setg(errp, "not allowing backing file change on an image "
2982 "without a backing file");
2983 goto out;
2984 }
2985
2986 /* even though we are not necessarily operating on bs, we need it to
2987 * determine if block ops are currently prohibited on the chain */
2988 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_CHANGE, errp)) {
2989 goto out;
2990 }
2991
2992 /* final sanity check */
2993 if (!bdrv_chain_contains(bs, image_bs)) {
2994 error_setg(errp, "'%s' and image file are not in the same chain",
2995 device);
2996 goto out;
2997 }
2998
2999 /* if not r/w, reopen to make r/w */
3000 open_flags = image_bs->open_flags;
3001 ro = bdrv_is_read_only(image_bs);
3002
3003 if (ro) {
3004 bdrv_reopen(image_bs, open_flags | BDRV_O_RDWR, &local_err);
3005 if (local_err) {
3006 error_propagate(errp, local_err);
3007 goto out;
3008 }
3009 }
3010
3011 ret = bdrv_change_backing_file(image_bs, backing_file,
3012 image_bs->drv ? image_bs->drv->format_name : "");
3013
3014 if (ret < 0) {
3015 error_setg_errno(errp, -ret, "Could not change backing file to '%s'",
3016 backing_file);
3017 /* don't exit here, so we can try to restore open flags if
3018 * appropriate */
3019 }
3020
3021 if (ro) {
3022 bdrv_reopen(image_bs, open_flags, &local_err);
3023 if (local_err) {
3024 error_propagate(errp, local_err); /* will preserve prior errp */
3025 }
3026 }
3027
3028 out:
3029 aio_context_release(aio_context);
3030 }
3031
3032 void qmp_blockdev_add(BlockdevOptions *options, Error **errp)
3033 {
3034 QmpOutputVisitor *ov = qmp_output_visitor_new();
3035 BlockBackend *blk;
3036 QObject *obj;
3037 QDict *qdict;
3038 Error *local_err = NULL;
3039
3040 /* Require an ID in the top level */
3041 if (!options->has_id) {
3042 error_setg(errp, "Block device needs an ID");
3043 goto fail;
3044 }
3045
3046 /* TODO Sort it out in raw-posix and drive_new(): Reject aio=native with
3047 * cache.direct=false instead of silently switching to aio=threads, except
3048 * when called from drive_new().
3049 *
3050 * For now, simply forbidding the combination for all drivers will do. */
3051 if (options->has_aio && options->aio == BLOCKDEV_AIO_OPTIONS_NATIVE) {
3052 bool direct = options->has_cache &&
3053 options->cache->has_direct &&
3054 options->cache->direct;
3055 if (!direct) {
3056 error_setg(errp, "aio=native requires cache.direct=true");
3057 goto fail;
3058 }
3059 }
3060
3061 visit_type_BlockdevOptions(qmp_output_get_visitor(ov),
3062 &options, NULL, &local_err);
3063 if (local_err) {
3064 error_propagate(errp, local_err);
3065 goto fail;
3066 }
3067
3068 obj = qmp_output_get_qobject(ov);
3069 qdict = qobject_to_qdict(obj);
3070
3071 qdict_flatten(qdict);
3072
3073 blk = blockdev_init(NULL, qdict, &local_err);
3074 if (local_err) {
3075 error_propagate(errp, local_err);
3076 goto fail;
3077 }
3078
3079 if (bdrv_key_required(blk_bs(blk))) {
3080 blk_unref(blk);
3081 error_setg(errp, "blockdev-add doesn't support encrypted devices");
3082 goto fail;
3083 }
3084
3085 fail:
3086 qmp_output_visitor_cleanup(ov);
3087 }
3088
3089 BlockJobInfoList *qmp_query_block_jobs(Error **errp)
3090 {
3091 BlockJobInfoList *head = NULL, **p_next = &head;
3092 BlockDriverState *bs;
3093
3094 for (bs = bdrv_next(NULL); bs; bs = bdrv_next(bs)) {
3095 AioContext *aio_context = bdrv_get_aio_context(bs);
3096
3097 aio_context_acquire(aio_context);
3098
3099 if (bs->job) {
3100 BlockJobInfoList *elem = g_new0(BlockJobInfoList, 1);
3101 elem->value = block_job_query(bs->job);
3102 *p_next = elem;
3103 p_next = &elem->next;
3104 }
3105
3106 aio_context_release(aio_context);
3107 }
3108
3109 return head;
3110 }
3111
3112 QemuOptsList qemu_common_drive_opts = {
3113 .name = "drive",
3114 .head = QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts.head),
3115 .desc = {
3116 {
3117 .name = "snapshot",
3118 .type = QEMU_OPT_BOOL,
3119 .help = "enable/disable snapshot mode",
3120 },{
3121 .name = "discard",
3122 .type = QEMU_OPT_STRING,
3123 .help = "discard operation (ignore/off, unmap/on)",
3124 },{
3125 .name = BDRV_OPT_CACHE_WB,
3126 .type = QEMU_OPT_BOOL,
3127 .help = "enables writeback mode for any caches",
3128 },{
3129 .name = BDRV_OPT_CACHE_DIRECT,
3130 .type = QEMU_OPT_BOOL,
3131 .help = "enables use of O_DIRECT (bypass the host page cache)",
3132 },{
3133 .name = BDRV_OPT_CACHE_NO_FLUSH,
3134 .type = QEMU_OPT_BOOL,
3135 .help = "ignore any flush requests for the device",
3136 },{
3137 .name = "aio",
3138 .type = QEMU_OPT_STRING,
3139 .help = "host AIO implementation (threads, native)",
3140 },{
3141 .name = "format",
3142 .type = QEMU_OPT_STRING,
3143 .help = "disk format (raw, qcow2, ...)",
3144 },{
3145 .name = "rerror",
3146 .type = QEMU_OPT_STRING,
3147 .help = "read error action",
3148 },{
3149 .name = "werror",
3150 .type = QEMU_OPT_STRING,
3151 .help = "write error action",
3152 },{
3153 .name = "read-only",
3154 .type = QEMU_OPT_BOOL,
3155 .help = "open drive file as read-only",
3156 },{
3157 .name = "throttling.iops-total",
3158 .type = QEMU_OPT_NUMBER,
3159 .help = "limit total I/O operations per second",
3160 },{
3161 .name = "throttling.iops-read",
3162 .type = QEMU_OPT_NUMBER,
3163 .help = "limit read operations per second",
3164 },{
3165 .name = "throttling.iops-write",
3166 .type = QEMU_OPT_NUMBER,
3167 .help = "limit write operations per second",
3168 },{
3169 .name = "throttling.bps-total",
3170 .type = QEMU_OPT_NUMBER,
3171 .help = "limit total bytes per second",
3172 },{
3173 .name = "throttling.bps-read",
3174 .type = QEMU_OPT_NUMBER,
3175 .help = "limit read bytes per second",
3176 },{
3177 .name = "throttling.bps-write",
3178 .type = QEMU_OPT_NUMBER,
3179 .help = "limit write bytes per second",
3180 },{
3181 .name = "throttling.iops-total-max",
3182 .type = QEMU_OPT_NUMBER,
3183 .help = "I/O operations burst",
3184 },{
3185 .name = "throttling.iops-read-max",
3186 .type = QEMU_OPT_NUMBER,
3187 .help = "I/O operations read burst",
3188 },{
3189 .name = "throttling.iops-write-max",
3190 .type = QEMU_OPT_NUMBER,
3191 .help = "I/O operations write burst",
3192 },{
3193 .name = "throttling.bps-total-max",
3194 .type = QEMU_OPT_NUMBER,
3195 .help = "total bytes burst",
3196 },{
3197 .name = "throttling.bps-read-max",
3198 .type = QEMU_OPT_NUMBER,
3199 .help = "total bytes read burst",
3200 },{
3201 .name = "throttling.bps-write-max",
3202 .type = QEMU_OPT_NUMBER,
3203 .help = "total bytes write burst",
3204 },{
3205 .name = "throttling.iops-size",
3206 .type = QEMU_OPT_NUMBER,
3207 .help = "when limiting by iops max size of an I/O in bytes",
3208 },{
3209 .name = "throttling.group",
3210 .type = QEMU_OPT_STRING,
3211 .help = "name of the block throttling group",
3212 },{
3213 .name = "copy-on-read",
3214 .type = QEMU_OPT_BOOL,
3215 .help = "copy read data from backing file into image file",
3216 },{
3217 .name = "detect-zeroes",
3218 .type = QEMU_OPT_STRING,
3219 .help = "try to optimize zero writes (off, on, unmap)",
3220 },
3221 { /* end of list */ }
3222 },
3223 };
3224
3225 QemuOptsList qemu_drive_opts = {
3226 .name = "drive",
3227 .head = QTAILQ_HEAD_INITIALIZER(qemu_drive_opts.head),
3228 .desc = {
3229 /*
3230 * no elements => accept any params
3231 * validation will happen later
3232 */
3233 { /* end of list */ }
3234 },
3235 };
AR7 emulation for QEMU