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slirp: use less predictable directory name in /tmp for smb config (CVE-2015-4037)
[qemu/ar7.git] / blockdev.c
blob5eaf77e5995689d0b18bbf597c849ac38f8eefdb
1 /*
2 * QEMU host block devices
3 *
4 * Copyright (c) 2003-2008 Fabrice Bellard
5 *
6 * This work is licensed under the terms of the GNU GPL, version 2 or
7 * later. See the COPYING file in the top-level directory.
8 *
9 * This file incorporates work covered by the following copyright and
10 * permission notice:
11 *
12 * Copyright (c) 2003-2008 Fabrice Bellard
13 *
14 * Permission is hereby granted, free of charge, to any person obtaining a copy
15 * of this software and associated documentation files (the "Software"), to deal
16 * in the Software without restriction, including without limitation the rights
17 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
18 * copies of the Software, and to permit persons to whom the Software is
19 * furnished to do so, subject to the following conditions:
20 *
21 * The above copyright notice and this permission notice shall be included in
22 * all copies or substantial portions of the Software.
23 *
24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
25 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
26 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
27 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
28 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
29 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
30 * THE SOFTWARE.
31 */
32
33 #include "sysemu/block-backend.h"
34 #include "sysemu/blockdev.h"
35 #include "hw/block/block.h"
36 #include "block/blockjob.h"
37 #include "monitor/monitor.h"
38 #include "qemu/option.h"
39 #include "qemu/config-file.h"
40 #include "qapi/qmp/types.h"
41 #include "qapi-visit.h"
42 #include "qapi/qmp-output-visitor.h"
43 #include "qapi/util.h"
44 #include "sysemu/sysemu.h"
45 #include "block/block_int.h"
46 #include "qmp-commands.h"
47 #include "trace.h"
48 #include "sysemu/arch_init.h"
49
50 static const char *const if_name[IF_COUNT] = {
51 [IF_NONE] = "none",
52 [IF_IDE] = "ide",
53 [IF_SCSI] = "scsi",
54 [IF_FLOPPY] = "floppy",
55 [IF_PFLASH] = "pflash",
56 [IF_MTD] = "mtd",
57 [IF_SD] = "sd",
58 [IF_VIRTIO] = "virtio",
59 [IF_XEN] = "xen",
60 };
61
62 static int if_max_devs[IF_COUNT] = {
63 /*
64 * Do not change these numbers! They govern how drive option
65 * index maps to unit and bus. That mapping is ABI.
66 *
67 * All controllers used to imlement if=T drives need to support
68 * if_max_devs[T] units, for any T with if_max_devs[T] != 0.
69 * Otherwise, some index values map to "impossible" bus, unit
70 * values.
71 *
72 * For instance, if you change [IF_SCSI] to 255, -drive
73 * if=scsi,index=12 no longer means bus=1,unit=5, but
74 * bus=0,unit=12. With an lsi53c895a controller (7 units max),
75 * the drive can't be set up. Regression.
76 */
77 [IF_IDE] = 2,
78 [IF_SCSI] = 7,
79 };
80
81 /**
82 * Boards may call this to offer board-by-board overrides
83 * of the default, global values.
84 */
85 void override_max_devs(BlockInterfaceType type, int max_devs)
86 {
87 BlockBackend *blk;
88 DriveInfo *dinfo;
89
90 if (max_devs <= 0) {
91 return;
92 }
93
94 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
95 dinfo = blk_legacy_dinfo(blk);
96 if (dinfo->type == type) {
97 fprintf(stderr, "Cannot override units-per-bus property of"
98 " the %s interface, because a drive of that type has"
99 " already been added.\n", if_name[type]);
100 g_assert_not_reached();
101 }
102 }
103
104 if_max_devs[type] = max_devs;
105 }
106
107 /*
108 * We automatically delete the drive when a device using it gets
109 * unplugged. Questionable feature, but we can't just drop it.
110 * Device models call blockdev_mark_auto_del() to schedule the
111 * automatic deletion, and generic qdev code calls blockdev_auto_del()
112 * when deletion is actually safe.
113 */
114 void blockdev_mark_auto_del(BlockBackend *blk)
115 {
116 DriveInfo *dinfo = blk_legacy_dinfo(blk);
117 BlockDriverState *bs = blk_bs(blk);
118 AioContext *aio_context;
119
120 if (!dinfo) {
121 return;
122 }
123
124 aio_context = bdrv_get_aio_context(bs);
125 aio_context_acquire(aio_context);
126
127 if (bs->job) {
128 block_job_cancel(bs->job);
129 }
130
131 aio_context_release(aio_context);
132
133 dinfo->auto_del = 1;
134 }
135
136 void blockdev_auto_del(BlockBackend *blk)
137 {
138 DriveInfo *dinfo = blk_legacy_dinfo(blk);
139
140 if (dinfo && dinfo->auto_del) {
141 blk_unref(blk);
142 }
143 }
144
145 /**
146 * Returns the current mapping of how many units per bus
147 * a particular interface can support.
148 *
149 * A positive integer indicates n units per bus.
150 * 0 implies the mapping has not been established.
151 * -1 indicates an invalid BlockInterfaceType was given.
152 */
153 int drive_get_max_devs(BlockInterfaceType type)
154 {
155 if (type >= IF_IDE && type < IF_COUNT) {
156 return if_max_devs[type];
157 }
158
159 return -1;
160 }
161
162 static int drive_index_to_bus_id(BlockInterfaceType type, int index)
163 {
164 int max_devs = if_max_devs[type];
165 return max_devs ? index / max_devs : 0;
166 }
167
168 static int drive_index_to_unit_id(BlockInterfaceType type, int index)
169 {
170 int max_devs = if_max_devs[type];
171 return max_devs ? index % max_devs : index;
172 }
173
174 QemuOpts *drive_def(const char *optstr)
175 {
176 return qemu_opts_parse(qemu_find_opts("drive"), optstr, 0);
177 }
178
179 QemuOpts *drive_add(BlockInterfaceType type, int index, const char *file,
180 const char *optstr)
181 {
182 QemuOpts *opts;
183
184 opts = drive_def(optstr);
185 if (!opts) {
186 return NULL;
187 }
188 if (type != IF_DEFAULT) {
189 qemu_opt_set(opts, "if", if_name[type], &error_abort);
190 }
191 if (index >= 0) {
192 qemu_opt_set_number(opts, "index", index, &error_abort);
193 }
194 if (file)
195 qemu_opt_set(opts, "file", file, &error_abort);
196 return opts;
197 }
198
199 DriveInfo *drive_get(BlockInterfaceType type, int bus, int unit)
200 {
201 BlockBackend *blk;
202 DriveInfo *dinfo;
203
204 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
205 dinfo = blk_legacy_dinfo(blk);
206 if (dinfo && dinfo->type == type
207 && dinfo->bus == bus && dinfo->unit == unit) {
208 return dinfo;
209 }
210 }
211
212 return NULL;
213 }
214
215 bool drive_check_orphaned(void)
216 {
217 BlockBackend *blk;
218 DriveInfo *dinfo;
219 bool rs = false;
220
221 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
222 dinfo = blk_legacy_dinfo(blk);
223 /* If dinfo->bdrv->dev is NULL, it has no device attached. */
224 /* Unless this is a default drive, this may be an oversight. */
225 if (!blk_get_attached_dev(blk) && !dinfo->is_default &&
226 dinfo->type != IF_NONE) {
227 fprintf(stderr, "Warning: Orphaned drive without device: "
228 "id=%s,file=%s,if=%s,bus=%d,unit=%d\n",
229 blk_name(blk), blk_bs(blk)->filename, if_name[dinfo->type],
230 dinfo->bus, dinfo->unit);
231 rs = true;
232 }
233 }
234
235 return rs;
236 }
237
238 DriveInfo *drive_get_by_index(BlockInterfaceType type, int index)
239 {
240 return drive_get(type,
241 drive_index_to_bus_id(type, index),
242 drive_index_to_unit_id(type, index));
243 }
244
245 int drive_get_max_bus(BlockInterfaceType type)
246 {
247 int max_bus;
248 BlockBackend *blk;
249 DriveInfo *dinfo;
250
251 max_bus = -1;
252 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
253 dinfo = blk_legacy_dinfo(blk);
254 if (dinfo && dinfo->type == type && dinfo->bus > max_bus) {
255 max_bus = dinfo->bus;
256 }
257 }
258 return max_bus;
259 }
260
261 /* Get a block device. This should only be used for single-drive devices
262 (e.g. SD/Floppy/MTD). Multi-disk devices (scsi/ide) should use the
263 appropriate bus. */
264 DriveInfo *drive_get_next(BlockInterfaceType type)
265 {
266 static int next_block_unit[IF_COUNT];
267
268 return drive_get(type, 0, next_block_unit[type]++);
269 }
270
271 static void bdrv_format_print(void *opaque, const char *name)
272 {
273 error_printf(" %s", name);
274 }
275
276 typedef struct {
277 QEMUBH *bh;
278 BlockDriverState *bs;
279 } BDRVPutRefBH;
280
281 static void bdrv_put_ref_bh(void *opaque)
282 {
283 BDRVPutRefBH *s = opaque;
284
285 bdrv_unref(s->bs);
286 qemu_bh_delete(s->bh);
287 g_free(s);
288 }
289
290 /*
291 * Release a BDS reference in a BH
292 *
293 * It is not safe to use bdrv_unref() from a callback function when the callers
294 * still need the BlockDriverState. In such cases we schedule a BH to release
295 * the reference.
296 */
297 static void bdrv_put_ref_bh_schedule(BlockDriverState *bs)
298 {
299 BDRVPutRefBH *s;
300
301 s = g_new(BDRVPutRefBH, 1);
302 s->bh = qemu_bh_new(bdrv_put_ref_bh, s);
303 s->bs = bs;
304 qemu_bh_schedule(s->bh);
305 }
306
307 static int parse_block_error_action(const char *buf, bool is_read, Error **errp)
308 {
309 if (!strcmp(buf, "ignore")) {
310 return BLOCKDEV_ON_ERROR_IGNORE;
311 } else if (!is_read && !strcmp(buf, "enospc")) {
312 return BLOCKDEV_ON_ERROR_ENOSPC;
313 } else if (!strcmp(buf, "stop")) {
314 return BLOCKDEV_ON_ERROR_STOP;
315 } else if (!strcmp(buf, "report")) {
316 return BLOCKDEV_ON_ERROR_REPORT;
317 } else {
318 error_setg(errp, "'%s' invalid %s error action",
319 buf, is_read ? "read" : "write");
320 return -1;
321 }
322 }
323
324 static bool check_throttle_config(ThrottleConfig *cfg, Error **errp)
325 {
326 if (throttle_conflicting(cfg)) {
327 error_setg(errp, "bps/iops/max total values and read/write values"
328 " cannot be used at the same time");
329 return false;
330 }
331
332 if (!throttle_is_valid(cfg)) {
333 error_setg(errp, "bps/iops/maxs values must be 0 or greater");
334 return false;
335 }
336
337 return true;
338 }
339
340 typedef enum { MEDIA_DISK, MEDIA_CDROM } DriveMediaType;
341
342 /* Takes the ownership of bs_opts */
343 static BlockBackend *blockdev_init(const char *file, QDict *bs_opts,
344 Error **errp)
345 {
346 const char *buf;
347 int ro = 0;
348 int bdrv_flags = 0;
349 int on_read_error, on_write_error;
350 BlockBackend *blk;
351 BlockDriverState *bs;
352 ThrottleConfig cfg;
353 int snapshot = 0;
354 bool copy_on_read;
355 Error *error = NULL;
356 QemuOpts *opts;
357 const char *id;
358 bool has_driver_specific_opts;
359 BlockdevDetectZeroesOptions detect_zeroes;
360
361 /* Check common options by copying from bs_opts to opts, all other options
362 * stay in bs_opts for processing by bdrv_open(). */
363 id = qdict_get_try_str(bs_opts, "id");
364 opts = qemu_opts_create(&qemu_common_drive_opts, id, 1, &error);
365 if (error) {
366 error_propagate(errp, error);
367 goto err_no_opts;
368 }
369
370 qemu_opts_absorb_qdict(opts, bs_opts, &error);
371 if (error) {
372 error_propagate(errp, error);
373 goto early_err;
374 }
375
376 if (id) {
377 qdict_del(bs_opts, "id");
378 }
379
380 has_driver_specific_opts = !!qdict_size(bs_opts);
381
382 /* extract parameters */
383 snapshot = qemu_opt_get_bool(opts, "snapshot", 0);
384 ro = qemu_opt_get_bool(opts, "read-only", 0);
385 copy_on_read = qemu_opt_get_bool(opts, "copy-on-read", false);
386
387 if ((buf = qemu_opt_get(opts, "discard")) != NULL) {
388 if (bdrv_parse_discard_flags(buf, &bdrv_flags) != 0) {
389 error_setg(errp, "invalid discard option");
390 goto early_err;
391 }
392 }
393
394 if (qemu_opt_get_bool(opts, "cache.writeback", true)) {
395 bdrv_flags |= BDRV_O_CACHE_WB;
396 }
397 if (qemu_opt_get_bool(opts, "cache.direct", false)) {
398 bdrv_flags |= BDRV_O_NOCACHE;
399 }
400 if (qemu_opt_get_bool(opts, "cache.no-flush", false)) {
401 bdrv_flags |= BDRV_O_NO_FLUSH;
402 }
403
404 #ifdef CONFIG_LINUX_AIO
405 if ((buf = qemu_opt_get(opts, "aio")) != NULL) {
406 if (!strcmp(buf, "native")) {
407 bdrv_flags |= BDRV_O_NATIVE_AIO;
408 } else if (!strcmp(buf, "threads")) {
409 /* this is the default */
410 } else {
411 error_setg(errp, "invalid aio option");
412 goto early_err;
413 }
414 }
415 #endif
416
417 if ((buf = qemu_opt_get(opts, "format")) != NULL) {
418 if (is_help_option(buf)) {
419 error_printf("Supported formats:");
420 bdrv_iterate_format(bdrv_format_print, NULL);
421 error_printf("\n");
422 goto early_err;
423 }
424
425 if (qdict_haskey(bs_opts, "driver")) {
426 error_setg(errp, "Cannot specify both 'driver' and 'format'");
427 goto early_err;
428 }
429 qdict_put(bs_opts, "driver", qstring_from_str(buf));
430 }
431
432 /* disk I/O throttling */
433 memset(&cfg, 0, sizeof(cfg));
434 cfg.buckets[THROTTLE_BPS_TOTAL].avg =
435 qemu_opt_get_number(opts, "throttling.bps-total", 0);
436 cfg.buckets[THROTTLE_BPS_READ].avg =
437 qemu_opt_get_number(opts, "throttling.bps-read", 0);
438 cfg.buckets[THROTTLE_BPS_WRITE].avg =
439 qemu_opt_get_number(opts, "throttling.bps-write", 0);
440 cfg.buckets[THROTTLE_OPS_TOTAL].avg =
441 qemu_opt_get_number(opts, "throttling.iops-total", 0);
442 cfg.buckets[THROTTLE_OPS_READ].avg =
443 qemu_opt_get_number(opts, "throttling.iops-read", 0);
444 cfg.buckets[THROTTLE_OPS_WRITE].avg =
445 qemu_opt_get_number(opts, "throttling.iops-write", 0);
446
447 cfg.buckets[THROTTLE_BPS_TOTAL].max =
448 qemu_opt_get_number(opts, "throttling.bps-total-max", 0);
449 cfg.buckets[THROTTLE_BPS_READ].max =
450 qemu_opt_get_number(opts, "throttling.bps-read-max", 0);
451 cfg.buckets[THROTTLE_BPS_WRITE].max =
452 qemu_opt_get_number(opts, "throttling.bps-write-max", 0);
453 cfg.buckets[THROTTLE_OPS_TOTAL].max =
454 qemu_opt_get_number(opts, "throttling.iops-total-max", 0);
455 cfg.buckets[THROTTLE_OPS_READ].max =
456 qemu_opt_get_number(opts, "throttling.iops-read-max", 0);
457 cfg.buckets[THROTTLE_OPS_WRITE].max =
458 qemu_opt_get_number(opts, "throttling.iops-write-max", 0);
459
460 cfg.op_size = qemu_opt_get_number(opts, "throttling.iops-size", 0);
461
462 if (!check_throttle_config(&cfg, &error)) {
463 error_propagate(errp, error);
464 goto early_err;
465 }
466
467 on_write_error = BLOCKDEV_ON_ERROR_ENOSPC;
468 if ((buf = qemu_opt_get(opts, "werror")) != NULL) {
469 on_write_error = parse_block_error_action(buf, 0, &error);
470 if (error) {
471 error_propagate(errp, error);
472 goto early_err;
473 }
474 }
475
476 on_read_error = BLOCKDEV_ON_ERROR_REPORT;
477 if ((buf = qemu_opt_get(opts, "rerror")) != NULL) {
478 on_read_error = parse_block_error_action(buf, 1, &error);
479 if (error) {
480 error_propagate(errp, error);
481 goto early_err;
482 }
483 }
484
485 detect_zeroes =
486 qapi_enum_parse(BlockdevDetectZeroesOptions_lookup,
487 qemu_opt_get(opts, "detect-zeroes"),
488 BLOCKDEV_DETECT_ZEROES_OPTIONS_MAX,
489 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF,
490 &error);
491 if (error) {
492 error_propagate(errp, error);
493 goto early_err;
494 }
495
496 if (detect_zeroes == BLOCKDEV_DETECT_ZEROES_OPTIONS_UNMAP &&
497 !(bdrv_flags & BDRV_O_UNMAP)) {
498 error_setg(errp, "setting detect-zeroes to unmap is not allowed "
499 "without setting discard operation to unmap");
500 goto early_err;
501 }
502
503 /* init */
504 if ((!file || !*file) && !has_driver_specific_opts) {
505 blk = blk_new_with_bs(qemu_opts_id(opts), errp);
506 if (!blk) {
507 goto early_err;
508 }
509
510 bs = blk_bs(blk);
511 bs->open_flags = snapshot ? BDRV_O_SNAPSHOT : 0;
512 bs->read_only = ro;
513
514 QDECREF(bs_opts);
515 } else {
516 if (file && !*file) {
517 file = NULL;
518 }
519
520 if (snapshot) {
521 /* always use cache=unsafe with snapshot */
522 bdrv_flags &= ~BDRV_O_CACHE_MASK;
523 bdrv_flags |= (BDRV_O_SNAPSHOT|BDRV_O_CACHE_WB|BDRV_O_NO_FLUSH);
524 }
525
526 if (copy_on_read) {
527 bdrv_flags |= BDRV_O_COPY_ON_READ;
528 }
529
530 if (runstate_check(RUN_STATE_INMIGRATE)) {
531 bdrv_flags |= BDRV_O_INCOMING;
532 }
533
534 bdrv_flags |= ro ? 0 : BDRV_O_RDWR;
535
536 blk = blk_new_open(qemu_opts_id(opts), file, NULL, bs_opts, bdrv_flags,
537 errp);
538 if (!blk) {
539 goto err_no_bs_opts;
540 }
541 bs = blk_bs(blk);
542 }
543
544 bs->detect_zeroes = detect_zeroes;
545
546 bdrv_set_on_error(bs, on_read_error, on_write_error);
547
548 /* disk I/O throttling */
549 if (throttle_enabled(&cfg)) {
550 bdrv_io_limits_enable(bs);
551 bdrv_set_io_limits(bs, &cfg);
552 }
553
554 if (bdrv_key_required(bs)) {
555 autostart = 0;
556 }
557
558 err_no_bs_opts:
559 qemu_opts_del(opts);
560 return blk;
561
562 early_err:
563 qemu_opts_del(opts);
564 err_no_opts:
565 QDECREF(bs_opts);
566 return NULL;
567 }
568
569 static void qemu_opt_rename(QemuOpts *opts, const char *from, const char *to,
570 Error **errp)
571 {
572 const char *value;
573
574 value = qemu_opt_get(opts, from);
575 if (value) {
576 if (qemu_opt_find(opts, to)) {
577 error_setg(errp, "'%s' and its alias '%s' can't be used at the "
578 "same time", to, from);
579 return;
580 }
581 }
582
583 /* rename all items in opts */
584 while ((value = qemu_opt_get(opts, from))) {
585 qemu_opt_set(opts, to, value, &error_abort);
586 qemu_opt_unset(opts, from);
587 }
588 }
589
590 QemuOptsList qemu_legacy_drive_opts = {
591 .name = "drive",
592 .head = QTAILQ_HEAD_INITIALIZER(qemu_legacy_drive_opts.head),
593 .desc = {
594 {
595 .name = "bus",
596 .type = QEMU_OPT_NUMBER,
597 .help = "bus number",
598 },{
599 .name = "unit",
600 .type = QEMU_OPT_NUMBER,
601 .help = "unit number (i.e. lun for scsi)",
602 },{
603 .name = "index",
604 .type = QEMU_OPT_NUMBER,
605 .help = "index number",
606 },{
607 .name = "media",
608 .type = QEMU_OPT_STRING,
609 .help = "media type (disk, cdrom)",
610 },{
611 .name = "if",
612 .type = QEMU_OPT_STRING,
613 .help = "interface (ide, scsi, sd, mtd, floppy, pflash, virtio)",
614 },{
615 .name = "cyls",
616 .type = QEMU_OPT_NUMBER,
617 .help = "number of cylinders (ide disk geometry)",
618 },{
619 .name = "heads",
620 .type = QEMU_OPT_NUMBER,
621 .help = "number of heads (ide disk geometry)",
622 },{
623 .name = "secs",
624 .type = QEMU_OPT_NUMBER,
625 .help = "number of sectors (ide disk geometry)",
626 },{
627 .name = "trans",
628 .type = QEMU_OPT_STRING,
629 .help = "chs translation (auto, lba, none)",
630 },{
631 .name = "boot",
632 .type = QEMU_OPT_BOOL,
633 .help = "(deprecated, ignored)",
634 },{
635 .name = "addr",
636 .type = QEMU_OPT_STRING,
637 .help = "pci address (virtio only)",
638 },{
639 .name = "serial",
640 .type = QEMU_OPT_STRING,
641 .help = "disk serial number",
642 },{
643 .name = "file",
644 .type = QEMU_OPT_STRING,
645 .help = "file name",
646 },
647
648 /* Options that are passed on, but have special semantics with -drive */
649 {
650 .name = "read-only",
651 .type = QEMU_OPT_BOOL,
652 .help = "open drive file as read-only",
653 },{
654 .name = "rerror",
655 .type = QEMU_OPT_STRING,
656 .help = "read error action",
657 },{
658 .name = "werror",
659 .type = QEMU_OPT_STRING,
660 .help = "write error action",
661 },{
662 .name = "copy-on-read",
663 .type = QEMU_OPT_BOOL,
664 .help = "copy read data from backing file into image file",
665 },
666
667 { /* end of list */ }
668 },
669 };
670
671 DriveInfo *drive_new(QemuOpts *all_opts, BlockInterfaceType block_default_type)
672 {
673 const char *value;
674 BlockBackend *blk;
675 DriveInfo *dinfo = NULL;
676 QDict *bs_opts;
677 QemuOpts *legacy_opts;
678 DriveMediaType media = MEDIA_DISK;
679 BlockInterfaceType type;
680 int cyls, heads, secs, translation;
681 int max_devs, bus_id, unit_id, index;
682 const char *devaddr;
683 const char *werror, *rerror;
684 bool read_only = false;
685 bool copy_on_read;
686 const char *serial;
687 const char *filename;
688 Error *local_err = NULL;
689 int i;
690
691 /* Change legacy command line options into QMP ones */
692 static const struct {
693 const char *from;
694 const char *to;
695 } opt_renames[] = {
696 { "iops", "throttling.iops-total" },
697 { "iops_rd", "throttling.iops-read" },
698 { "iops_wr", "throttling.iops-write" },
699
700 { "bps", "throttling.bps-total" },
701 { "bps_rd", "throttling.bps-read" },
702 { "bps_wr", "throttling.bps-write" },
703
704 { "iops_max", "throttling.iops-total-max" },
705 { "iops_rd_max", "throttling.iops-read-max" },
706 { "iops_wr_max", "throttling.iops-write-max" },
707
708 { "bps_max", "throttling.bps-total-max" },
709 { "bps_rd_max", "throttling.bps-read-max" },
710 { "bps_wr_max", "throttling.bps-write-max" },
711
712 { "iops_size", "throttling.iops-size" },
713
714 { "readonly", "read-only" },
715 };
716
717 for (i = 0; i < ARRAY_SIZE(opt_renames); i++) {
718 qemu_opt_rename(all_opts, opt_renames[i].from, opt_renames[i].to,
719 &local_err);
720 if (local_err) {
721 error_report_err(local_err);
722 return NULL;
723 }
724 }
725
726 value = qemu_opt_get(all_opts, "cache");
727 if (value) {
728 int flags = 0;
729
730 if (bdrv_parse_cache_flags(value, &flags) != 0) {
731 error_report("invalid cache option");
732 return NULL;
733 }
734
735 /* Specific options take precedence */
736 if (!qemu_opt_get(all_opts, "cache.writeback")) {
737 qemu_opt_set_bool(all_opts, "cache.writeback",
738 !!(flags & BDRV_O_CACHE_WB), &error_abort);
739 }
740 if (!qemu_opt_get(all_opts, "cache.direct")) {
741 qemu_opt_set_bool(all_opts, "cache.direct",
742 !!(flags & BDRV_O_NOCACHE), &error_abort);
743 }
744 if (!qemu_opt_get(all_opts, "cache.no-flush")) {
745 qemu_opt_set_bool(all_opts, "cache.no-flush",
746 !!(flags & BDRV_O_NO_FLUSH), &error_abort);
747 }
748 qemu_opt_unset(all_opts, "cache");
749 }
750
751 /* Get a QDict for processing the options */
752 bs_opts = qdict_new();
753 qemu_opts_to_qdict(all_opts, bs_opts);
754
755 legacy_opts = qemu_opts_create(&qemu_legacy_drive_opts, NULL, 0,
756 &error_abort);
757 qemu_opts_absorb_qdict(legacy_opts, bs_opts, &local_err);
758 if (local_err) {
759 error_report_err(local_err);
760 goto fail;
761 }
762
763 /* Deprecated option boot=[on|off] */
764 if (qemu_opt_get(legacy_opts, "boot") != NULL) {
765 fprintf(stderr, "qemu-kvm: boot=on|off is deprecated and will be "
766 "ignored. Future versions will reject this parameter. Please "
767 "update your scripts.\n");
768 }
769
770 /* Media type */
771 value = qemu_opt_get(legacy_opts, "media");
772 if (value) {
773 if (!strcmp(value, "disk")) {
774 media = MEDIA_DISK;
775 } else if (!strcmp(value, "cdrom")) {
776 media = MEDIA_CDROM;
777 read_only = true;
778 } else {
779 error_report("'%s' invalid media", value);
780 goto fail;
781 }
782 }
783
784 /* copy-on-read is disabled with a warning for read-only devices */
785 read_only |= qemu_opt_get_bool(legacy_opts, "read-only", false);
786 copy_on_read = qemu_opt_get_bool(legacy_opts, "copy-on-read", false);
787
788 if (read_only && copy_on_read) {
789 error_report("warning: disabling copy-on-read on read-only drive");
790 copy_on_read = false;
791 }
792
793 qdict_put(bs_opts, "read-only",
794 qstring_from_str(read_only ? "on" : "off"));
795 qdict_put(bs_opts, "copy-on-read",
796 qstring_from_str(copy_on_read ? "on" :"off"));
797
798 /* Controller type */
799 value = qemu_opt_get(legacy_opts, "if");
800 if (value) {
801 for (type = 0;
802 type < IF_COUNT && strcmp(value, if_name[type]);
803 type++) {
804 }
805 if (type == IF_COUNT) {
806 error_report("unsupported bus type '%s'", value);
807 goto fail;
808 }
809 } else {
810 type = block_default_type;
811 }
812
813 /* Geometry */
814 cyls = qemu_opt_get_number(legacy_opts, "cyls", 0);
815 heads = qemu_opt_get_number(legacy_opts, "heads", 0);
816 secs = qemu_opt_get_number(legacy_opts, "secs", 0);
817
818 if (cyls || heads || secs) {
819 if (cyls < 1) {
820 error_report("invalid physical cyls number");
821 goto fail;
822 }
823 if (heads < 1) {
824 error_report("invalid physical heads number");
825 goto fail;
826 }
827 if (secs < 1) {
828 error_report("invalid physical secs number");
829 goto fail;
830 }
831 }
832
833 translation = BIOS_ATA_TRANSLATION_AUTO;
834 value = qemu_opt_get(legacy_opts, "trans");
835 if (value != NULL) {
836 if (!cyls) {
837 error_report("'%s' trans must be used with cyls, heads and secs",
838 value);
839 goto fail;
840 }
841 if (!strcmp(value, "none")) {
842 translation = BIOS_ATA_TRANSLATION_NONE;
843 } else if (!strcmp(value, "lba")) {
844 translation = BIOS_ATA_TRANSLATION_LBA;
845 } else if (!strcmp(value, "large")) {
846 translation = BIOS_ATA_TRANSLATION_LARGE;
847 } else if (!strcmp(value, "rechs")) {
848 translation = BIOS_ATA_TRANSLATION_RECHS;
849 } else if (!strcmp(value, "auto")) {
850 translation = BIOS_ATA_TRANSLATION_AUTO;
851 } else {
852 error_report("'%s' invalid translation type", value);
853 goto fail;
854 }
855 }
856
857 if (media == MEDIA_CDROM) {
858 if (cyls || secs || heads) {
859 error_report("CHS can't be set with media=cdrom");
860 goto fail;
861 }
862 }
863
864 /* Device address specified by bus/unit or index.
865 * If none was specified, try to find the first free one. */
866 bus_id = qemu_opt_get_number(legacy_opts, "bus", 0);
867 unit_id = qemu_opt_get_number(legacy_opts, "unit", -1);
868 index = qemu_opt_get_number(legacy_opts, "index", -1);
869
870 max_devs = if_max_devs[type];
871
872 if (index != -1) {
873 if (bus_id != 0 || unit_id != -1) {
874 error_report("index cannot be used with bus and unit");
875 goto fail;
876 }
877 bus_id = drive_index_to_bus_id(type, index);
878 unit_id = drive_index_to_unit_id(type, index);
879 }
880
881 if (unit_id == -1) {
882 unit_id = 0;
883 while (drive_get(type, bus_id, unit_id) != NULL) {
884 unit_id++;
885 if (max_devs && unit_id >= max_devs) {
886 unit_id -= max_devs;
887 bus_id++;
888 }
889 }
890 }
891
892 if (max_devs && unit_id >= max_devs) {
893 error_report("unit %d too big (max is %d)", unit_id, max_devs - 1);
894 goto fail;
895 }
896
897 if (drive_get(type, bus_id, unit_id) != NULL) {
898 error_report("drive with bus=%d, unit=%d (index=%d) exists",
899 bus_id, unit_id, index);
900 goto fail;
901 }
902
903 /* Serial number */
904 serial = qemu_opt_get(legacy_opts, "serial");
905
906 /* no id supplied -> create one */
907 if (qemu_opts_id(all_opts) == NULL) {
908 char *new_id;
909 const char *mediastr = "";
910 if (type == IF_IDE || type == IF_SCSI) {
911 mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd";
912 }
913 if (max_devs) {
914 new_id = g_strdup_printf("%s%i%s%i", if_name[type], bus_id,
915 mediastr, unit_id);
916 } else {
917 new_id = g_strdup_printf("%s%s%i", if_name[type],
918 mediastr, unit_id);
919 }
920 qdict_put(bs_opts, "id", qstring_from_str(new_id));
921 g_free(new_id);
922 }
923
924 /* Add virtio block device */
925 devaddr = qemu_opt_get(legacy_opts, "addr");
926 if (devaddr && type != IF_VIRTIO) {
927 error_report("addr is not supported by this bus type");
928 goto fail;
929 }
930
931 if (type == IF_VIRTIO) {
932 QemuOpts *devopts;
933 devopts = qemu_opts_create(qemu_find_opts("device"), NULL, 0,
934 &error_abort);
935 if (arch_type == QEMU_ARCH_S390X) {
936 qemu_opt_set(devopts, "driver", "virtio-blk-s390", &error_abort);
937 } else {
938 qemu_opt_set(devopts, "driver", "virtio-blk-pci", &error_abort);
939 }
940 qemu_opt_set(devopts, "drive", qdict_get_str(bs_opts, "id"),
941 &error_abort);
942 if (devaddr) {
943 qemu_opt_set(devopts, "addr", devaddr, &error_abort);
944 }
945 }
946
947 filename = qemu_opt_get(legacy_opts, "file");
948
949 /* Check werror/rerror compatibility with if=... */
950 werror = qemu_opt_get(legacy_opts, "werror");
951 if (werror != NULL) {
952 if (type != IF_IDE && type != IF_SCSI && type != IF_VIRTIO &&
953 type != IF_NONE) {
954 error_report("werror is not supported by this bus type");
955 goto fail;
956 }
957 qdict_put(bs_opts, "werror", qstring_from_str(werror));
958 }
959
960 rerror = qemu_opt_get(legacy_opts, "rerror");
961 if (rerror != NULL) {
962 if (type != IF_IDE && type != IF_VIRTIO && type != IF_SCSI &&
963 type != IF_NONE) {
964 error_report("rerror is not supported by this bus type");
965 goto fail;
966 }
967 qdict_put(bs_opts, "rerror", qstring_from_str(rerror));
968 }
969
970 /* Actual block device init: Functionality shared with blockdev-add */
971 blk = blockdev_init(filename, bs_opts, &local_err);
972 bs_opts = NULL;
973 if (!blk) {
974 if (local_err) {
975 error_report_err(local_err);
976 }
977 goto fail;
978 } else {
979 assert(!local_err);
980 }
981
982 /* Create legacy DriveInfo */
983 dinfo = g_malloc0(sizeof(*dinfo));
984 dinfo->opts = all_opts;
985
986 dinfo->cyls = cyls;
987 dinfo->heads = heads;
988 dinfo->secs = secs;
989 dinfo->trans = translation;
990
991 dinfo->type = type;
992 dinfo->bus = bus_id;
993 dinfo->unit = unit_id;
994 dinfo->devaddr = devaddr;
995 dinfo->serial = g_strdup(serial);
996
997 blk_set_legacy_dinfo(blk, dinfo);
998
999 switch(type) {
1000 case IF_IDE:
1001 case IF_SCSI:
1002 case IF_XEN:
1003 case IF_NONE:
1004 dinfo->media_cd = media == MEDIA_CDROM;
1005 break;
1006 default:
1007 break;
1008 }
1009
1010 fail:
1011 qemu_opts_del(legacy_opts);
1012 QDECREF(bs_opts);
1013 return dinfo;
1014 }
1015
1016 void hmp_commit(Monitor *mon, const QDict *qdict)
1017 {
1018 const char *device = qdict_get_str(qdict, "device");
1019 BlockBackend *blk;
1020 int ret;
1021
1022 if (!strcmp(device, "all")) {
1023 ret = bdrv_commit_all();
1024 } else {
1025 blk = blk_by_name(device);
1026 if (!blk) {
1027 monitor_printf(mon, "Device '%s' not found\n", device);
1028 return;
1029 }
1030 ret = bdrv_commit(blk_bs(blk));
1031 }
1032 if (ret < 0) {
1033 monitor_printf(mon, "'commit' error for '%s': %s\n", device,
1034 strerror(-ret));
1035 }
1036 }
1037
1038 static void blockdev_do_action(int kind, void *data, Error **errp)
1039 {
1040 TransactionAction action;
1041 TransactionActionList list;
1042
1043 action.kind = kind;
1044 action.data = data;
1045 list.value = &action;
1046 list.next = NULL;
1047 qmp_transaction(&list, errp);
1048 }
1049
1050 void qmp_blockdev_snapshot_sync(bool has_device, const char *device,
1051 bool has_node_name, const char *node_name,
1052 const char *snapshot_file,
1053 bool has_snapshot_node_name,
1054 const char *snapshot_node_name,
1055 bool has_format, const char *format,
1056 bool has_mode, NewImageMode mode, Error **errp)
1057 {
1058 BlockdevSnapshot snapshot = {
1059 .has_device = has_device,
1060 .device = (char *) device,
1061 .has_node_name = has_node_name,
1062 .node_name = (char *) node_name,
1063 .snapshot_file = (char *) snapshot_file,
1064 .has_snapshot_node_name = has_snapshot_node_name,
1065 .snapshot_node_name = (char *) snapshot_node_name,
1066 .has_format = has_format,
1067 .format = (char *) format,
1068 .has_mode = has_mode,
1069 .mode = mode,
1070 };
1071 blockdev_do_action(TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC,
1072 &snapshot, errp);
1073 }
1074
1075 void qmp_blockdev_snapshot_internal_sync(const char *device,
1076 const char *name,
1077 Error **errp)
1078 {
1079 BlockdevSnapshotInternal snapshot = {
1080 .device = (char *) device,
1081 .name = (char *) name
1082 };
1083
1084 blockdev_do_action(TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC,
1085 &snapshot, errp);
1086 }
1087
1088 SnapshotInfo *qmp_blockdev_snapshot_delete_internal_sync(const char *device,
1089 bool has_id,
1090 const char *id,
1091 bool has_name,
1092 const char *name,
1093 Error **errp)
1094 {
1095 BlockDriverState *bs;
1096 BlockBackend *blk;
1097 AioContext *aio_context;
1098 QEMUSnapshotInfo sn;
1099 Error *local_err = NULL;
1100 SnapshotInfo *info = NULL;
1101 int ret;
1102
1103 blk = blk_by_name(device);
1104 if (!blk) {
1105 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1106 return NULL;
1107 }
1108 bs = blk_bs(blk);
1109
1110 if (!has_id) {
1111 id = NULL;
1112 }
1113
1114 if (!has_name) {
1115 name = NULL;
1116 }
1117
1118 if (!id && !name) {
1119 error_setg(errp, "Name or id must be provided");
1120 return NULL;
1121 }
1122
1123 aio_context = bdrv_get_aio_context(bs);
1124 aio_context_acquire(aio_context);
1125
1126 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT_DELETE, errp)) {
1127 goto out_aio_context;
1128 }
1129
1130 ret = bdrv_snapshot_find_by_id_and_name(bs, id, name, &sn, &local_err);
1131 if (local_err) {
1132 error_propagate(errp, local_err);
1133 goto out_aio_context;
1134 }
1135 if (!ret) {
1136 error_setg(errp,
1137 "Snapshot with id '%s' and name '%s' does not exist on "
1138 "device '%s'",
1139 STR_OR_NULL(id), STR_OR_NULL(name), device);
1140 goto out_aio_context;
1141 }
1142
1143 bdrv_snapshot_delete(bs, id, name, &local_err);
1144 if (local_err) {
1145 error_propagate(errp, local_err);
1146 goto out_aio_context;
1147 }
1148
1149 aio_context_release(aio_context);
1150
1151 info = g_new0(SnapshotInfo, 1);
1152 info->id = g_strdup(sn.id_str);
1153 info->name = g_strdup(sn.name);
1154 info->date_nsec = sn.date_nsec;
1155 info->date_sec = sn.date_sec;
1156 info->vm_state_size = sn.vm_state_size;
1157 info->vm_clock_nsec = sn.vm_clock_nsec % 1000000000;
1158 info->vm_clock_sec = sn.vm_clock_nsec / 1000000000;
1159
1160 return info;
1161
1162 out_aio_context:
1163 aio_context_release(aio_context);
1164 return NULL;
1165 }
1166
1167 /**
1168 * block_dirty_bitmap_lookup:
1169 * Return a dirty bitmap (if present), after validating
1170 * the node reference and bitmap names.
1171 *
1172 * @node: The name of the BDS node to search for bitmaps
1173 * @name: The name of the bitmap to search for
1174 * @pbs: Output pointer for BDS lookup, if desired. Can be NULL.
1175 * @paio: Output pointer for aio_context acquisition, if desired. Can be NULL.
1176 * @errp: Output pointer for error information. Can be NULL.
1177 *
1178 * @return: A bitmap object on success, or NULL on failure.
1179 */
1180 static BdrvDirtyBitmap *block_dirty_bitmap_lookup(const char *node,
1181 const char *name,
1182 BlockDriverState **pbs,
1183 AioContext **paio,
1184 Error **errp)
1185 {
1186 BlockDriverState *bs;
1187 BdrvDirtyBitmap *bitmap;
1188 AioContext *aio_context;
1189
1190 if (!node) {
1191 error_setg(errp, "Node cannot be NULL");
1192 return NULL;
1193 }
1194 if (!name) {
1195 error_setg(errp, "Bitmap name cannot be NULL");
1196 return NULL;
1197 }
1198 bs = bdrv_lookup_bs(node, node, NULL);
1199 if (!bs) {
1200 error_setg(errp, "Node '%s' not found", node);
1201 return NULL;
1202 }
1203
1204 aio_context = bdrv_get_aio_context(bs);
1205 aio_context_acquire(aio_context);
1206
1207 bitmap = bdrv_find_dirty_bitmap(bs, name);
1208 if (!bitmap) {
1209 error_setg(errp, "Dirty bitmap '%s' not found", name);
1210 goto fail;
1211 }
1212
1213 if (pbs) {
1214 *pbs = bs;
1215 }
1216 if (paio) {
1217 *paio = aio_context;
1218 } else {
1219 aio_context_release(aio_context);
1220 }
1221
1222 return bitmap;
1223
1224 fail:
1225 aio_context_release(aio_context);
1226 return NULL;
1227 }
1228
1229 /* New and old BlockDriverState structs for atomic group operations */
1230
1231 typedef struct BlkTransactionState BlkTransactionState;
1232
1233 /* Only prepare() may fail. In a single transaction, only one of commit() or
1234 abort() will be called, clean() will always be called if it present. */
1235 typedef struct BdrvActionOps {
1236 /* Size of state struct, in bytes. */
1237 size_t instance_size;
1238 /* Prepare the work, must NOT be NULL. */
1239 void (*prepare)(BlkTransactionState *common, Error **errp);
1240 /* Commit the changes, can be NULL. */
1241 void (*commit)(BlkTransactionState *common);
1242 /* Abort the changes on fail, can be NULL. */
1243 void (*abort)(BlkTransactionState *common);
1244 /* Clean up resource in the end, can be NULL. */
1245 void (*clean)(BlkTransactionState *common);
1246 } BdrvActionOps;
1247
1248 /*
1249 * This structure must be arranged as first member in child type, assuming
1250 * that compiler will also arrange it to the same address with parent instance.
1251 * Later it will be used in free().
1252 */
1253 struct BlkTransactionState {
1254 TransactionAction *action;
1255 const BdrvActionOps *ops;
1256 QSIMPLEQ_ENTRY(BlkTransactionState) entry;
1257 };
1258
1259 /* internal snapshot private data */
1260 typedef struct InternalSnapshotState {
1261 BlkTransactionState common;
1262 BlockDriverState *bs;
1263 AioContext *aio_context;
1264 QEMUSnapshotInfo sn;
1265 } InternalSnapshotState;
1266
1267 static void internal_snapshot_prepare(BlkTransactionState *common,
1268 Error **errp)
1269 {
1270 Error *local_err = NULL;
1271 const char *device;
1272 const char *name;
1273 BlockBackend *blk;
1274 BlockDriverState *bs;
1275 QEMUSnapshotInfo old_sn, *sn;
1276 bool ret;
1277 qemu_timeval tv;
1278 BlockdevSnapshotInternal *internal;
1279 InternalSnapshotState *state;
1280 int ret1;
1281
1282 g_assert(common->action->kind ==
1283 TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC);
1284 internal = common->action->blockdev_snapshot_internal_sync;
1285 state = DO_UPCAST(InternalSnapshotState, common, common);
1286
1287 /* 1. parse input */
1288 device = internal->device;
1289 name = internal->name;
1290
1291 /* 2. check for validation */
1292 blk = blk_by_name(device);
1293 if (!blk) {
1294 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1295 return;
1296 }
1297 bs = blk_bs(blk);
1298
1299 /* AioContext is released in .clean() */
1300 state->aio_context = bdrv_get_aio_context(bs);
1301 aio_context_acquire(state->aio_context);
1302
1303 if (!bdrv_is_inserted(bs)) {
1304 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1305 return;
1306 }
1307
1308 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT, errp)) {
1309 return;
1310 }
1311
1312 if (bdrv_is_read_only(bs)) {
1313 error_setg(errp, "Device '%s' is read only", device);
1314 return;
1315 }
1316
1317 if (!bdrv_can_snapshot(bs)) {
1318 error_setg(errp, "Block format '%s' used by device '%s' "
1319 "does not support internal snapshots",
1320 bs->drv->format_name, device);
1321 return;
1322 }
1323
1324 if (!strlen(name)) {
1325 error_setg(errp, "Name is empty");
1326 return;
1327 }
1328
1329 /* check whether a snapshot with name exist */
1330 ret = bdrv_snapshot_find_by_id_and_name(bs, NULL, name, &old_sn,
1331 &local_err);
1332 if (local_err) {
1333 error_propagate(errp, local_err);
1334 return;
1335 } else if (ret) {
1336 error_setg(errp,
1337 "Snapshot with name '%s' already exists on device '%s'",
1338 name, device);
1339 return;
1340 }
1341
1342 /* 3. take the snapshot */
1343 sn = &state->sn;
1344 pstrcpy(sn->name, sizeof(sn->name), name);
1345 qemu_gettimeofday(&tv);
1346 sn->date_sec = tv.tv_sec;
1347 sn->date_nsec = tv.tv_usec * 1000;
1348 sn->vm_clock_nsec = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
1349
1350 ret1 = bdrv_snapshot_create(bs, sn);
1351 if (ret1 < 0) {
1352 error_setg_errno(errp, -ret1,
1353 "Failed to create snapshot '%s' on device '%s'",
1354 name, device);
1355 return;
1356 }
1357
1358 /* 4. succeed, mark a snapshot is created */
1359 state->bs = bs;
1360 }
1361
1362 static void internal_snapshot_abort(BlkTransactionState *common)
1363 {
1364 InternalSnapshotState *state =
1365 DO_UPCAST(InternalSnapshotState, common, common);
1366 BlockDriverState *bs = state->bs;
1367 QEMUSnapshotInfo *sn = &state->sn;
1368 Error *local_error = NULL;
1369
1370 if (!bs) {
1371 return;
1372 }
1373
1374 if (bdrv_snapshot_delete(bs, sn->id_str, sn->name, &local_error) < 0) {
1375 error_report("Failed to delete snapshot with id '%s' and name '%s' on "
1376 "device '%s' in abort: %s",
1377 sn->id_str,
1378 sn->name,
1379 bdrv_get_device_name(bs),
1380 error_get_pretty(local_error));
1381 error_free(local_error);
1382 }
1383 }
1384
1385 static void internal_snapshot_clean(BlkTransactionState *common)
1386 {
1387 InternalSnapshotState *state = DO_UPCAST(InternalSnapshotState,
1388 common, common);
1389
1390 if (state->aio_context) {
1391 aio_context_release(state->aio_context);
1392 }
1393 }
1394
1395 /* external snapshot private data */
1396 typedef struct ExternalSnapshotState {
1397 BlkTransactionState common;
1398 BlockDriverState *old_bs;
1399 BlockDriverState *new_bs;
1400 AioContext *aio_context;
1401 } ExternalSnapshotState;
1402
1403 static void external_snapshot_prepare(BlkTransactionState *common,
1404 Error **errp)
1405 {
1406 BlockDriver *drv;
1407 int flags, ret;
1408 QDict *options = NULL;
1409 Error *local_err = NULL;
1410 bool has_device = false;
1411 const char *device;
1412 bool has_node_name = false;
1413 const char *node_name;
1414 bool has_snapshot_node_name = false;
1415 const char *snapshot_node_name;
1416 const char *new_image_file;
1417 const char *format = "qcow2";
1418 enum NewImageMode mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
1419 ExternalSnapshotState *state =
1420 DO_UPCAST(ExternalSnapshotState, common, common);
1421 TransactionAction *action = common->action;
1422
1423 /* get parameters */
1424 g_assert(action->kind == TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC);
1425
1426 has_device = action->blockdev_snapshot_sync->has_device;
1427 device = action->blockdev_snapshot_sync->device;
1428 has_node_name = action->blockdev_snapshot_sync->has_node_name;
1429 node_name = action->blockdev_snapshot_sync->node_name;
1430 has_snapshot_node_name =
1431 action->blockdev_snapshot_sync->has_snapshot_node_name;
1432 snapshot_node_name = action->blockdev_snapshot_sync->snapshot_node_name;
1433
1434 new_image_file = action->blockdev_snapshot_sync->snapshot_file;
1435 if (action->blockdev_snapshot_sync->has_format) {
1436 format = action->blockdev_snapshot_sync->format;
1437 }
1438 if (action->blockdev_snapshot_sync->has_mode) {
1439 mode = action->blockdev_snapshot_sync->mode;
1440 }
1441
1442 /* start processing */
1443 drv = bdrv_find_format(format);
1444 if (!drv) {
1445 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
1446 return;
1447 }
1448
1449 state->old_bs = bdrv_lookup_bs(has_device ? device : NULL,
1450 has_node_name ? node_name : NULL,
1451 &local_err);
1452 if (local_err) {
1453 error_propagate(errp, local_err);
1454 return;
1455 }
1456
1457 if (has_node_name && !has_snapshot_node_name) {
1458 error_setg(errp, "New snapshot node name missing");
1459 return;
1460 }
1461
1462 if (has_snapshot_node_name && bdrv_find_node(snapshot_node_name)) {
1463 error_setg(errp, "New snapshot node name already existing");
1464 return;
1465 }
1466
1467 /* Acquire AioContext now so any threads operating on old_bs stop */
1468 state->aio_context = bdrv_get_aio_context(state->old_bs);
1469 aio_context_acquire(state->aio_context);
1470
1471 if (!bdrv_is_inserted(state->old_bs)) {
1472 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1473 return;
1474 }
1475
1476 if (bdrv_op_is_blocked(state->old_bs,
1477 BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT, errp)) {
1478 return;
1479 }
1480
1481 if (!bdrv_is_read_only(state->old_bs)) {
1482 if (bdrv_flush(state->old_bs)) {
1483 error_set(errp, QERR_IO_ERROR);
1484 return;
1485 }
1486 }
1487
1488 if (!bdrv_is_first_non_filter(state->old_bs)) {
1489 error_set(errp, QERR_FEATURE_DISABLED, "snapshot");
1490 return;
1491 }
1492
1493 flags = state->old_bs->open_flags;
1494
1495 /* create new image w/backing file */
1496 if (mode != NEW_IMAGE_MODE_EXISTING) {
1497 bdrv_img_create(new_image_file, format,
1498 state->old_bs->filename,
1499 state->old_bs->drv->format_name,
1500 NULL, -1, flags, &local_err, false);
1501 if (local_err) {
1502 error_propagate(errp, local_err);
1503 return;
1504 }
1505 }
1506
1507 if (has_snapshot_node_name) {
1508 options = qdict_new();
1509 qdict_put(options, "node-name",
1510 qstring_from_str(snapshot_node_name));
1511 }
1512
1513 /* TODO Inherit bs->options or only take explicit options with an
1514 * extended QMP command? */
1515 assert(state->new_bs == NULL);
1516 ret = bdrv_open(&state->new_bs, new_image_file, NULL, options,
1517 flags | BDRV_O_NO_BACKING, drv, &local_err);
1518 /* We will manually add the backing_hd field to the bs later */
1519 if (ret != 0) {
1520 error_propagate(errp, local_err);
1521 }
1522 }
1523
1524 static void external_snapshot_commit(BlkTransactionState *common)
1525 {
1526 ExternalSnapshotState *state =
1527 DO_UPCAST(ExternalSnapshotState, common, common);
1528
1529 bdrv_set_aio_context(state->new_bs, state->aio_context);
1530
1531 /* This removes our old bs and adds the new bs */
1532 bdrv_append(state->new_bs, state->old_bs);
1533 /* We don't need (or want) to use the transactional
1534 * bdrv_reopen_multiple() across all the entries at once, because we
1535 * don't want to abort all of them if one of them fails the reopen */
1536 bdrv_reopen(state->new_bs, state->new_bs->open_flags & ~BDRV_O_RDWR,
1537 NULL);
1538
1539 aio_context_release(state->aio_context);
1540 }
1541
1542 static void external_snapshot_abort(BlkTransactionState *common)
1543 {
1544 ExternalSnapshotState *state =
1545 DO_UPCAST(ExternalSnapshotState, common, common);
1546 if (state->new_bs) {
1547 bdrv_unref(state->new_bs);
1548 }
1549 if (state->aio_context) {
1550 aio_context_release(state->aio_context);
1551 }
1552 }
1553
1554 typedef struct DriveBackupState {
1555 BlkTransactionState common;
1556 BlockDriverState *bs;
1557 AioContext *aio_context;
1558 BlockJob *job;
1559 } DriveBackupState;
1560
1561 static void drive_backup_prepare(BlkTransactionState *common, Error **errp)
1562 {
1563 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1564 BlockDriverState *bs;
1565 BlockBackend *blk;
1566 DriveBackup *backup;
1567 Error *local_err = NULL;
1568
1569 assert(common->action->kind == TRANSACTION_ACTION_KIND_DRIVE_BACKUP);
1570 backup = common->action->drive_backup;
1571
1572 blk = blk_by_name(backup->device);
1573 if (!blk) {
1574 error_set(errp, QERR_DEVICE_NOT_FOUND, backup->device);
1575 return;
1576 }
1577 bs = blk_bs(blk);
1578
1579 /* AioContext is released in .clean() */
1580 state->aio_context = bdrv_get_aio_context(bs);
1581 aio_context_acquire(state->aio_context);
1582
1583 qmp_drive_backup(backup->device, backup->target,
1584 backup->has_format, backup->format,
1585 backup->sync,
1586 backup->has_mode, backup->mode,
1587 backup->has_speed, backup->speed,
1588 backup->has_bitmap, backup->bitmap,
1589 backup->has_on_source_error, backup->on_source_error,
1590 backup->has_on_target_error, backup->on_target_error,
1591 &local_err);
1592 if (local_err) {
1593 error_propagate(errp, local_err);
1594 return;
1595 }
1596
1597 state->bs = bs;
1598 state->job = state->bs->job;
1599 }
1600
1601 static void drive_backup_abort(BlkTransactionState *common)
1602 {
1603 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1604 BlockDriverState *bs = state->bs;
1605
1606 /* Only cancel if it's the job we started */
1607 if (bs && bs->job && bs->job == state->job) {
1608 block_job_cancel_sync(bs->job);
1609 }
1610 }
1611
1612 static void drive_backup_clean(BlkTransactionState *common)
1613 {
1614 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1615
1616 if (state->aio_context) {
1617 aio_context_release(state->aio_context);
1618 }
1619 }
1620
1621 typedef struct BlockdevBackupState {
1622 BlkTransactionState common;
1623 BlockDriverState *bs;
1624 BlockJob *job;
1625 AioContext *aio_context;
1626 } BlockdevBackupState;
1627
1628 static void blockdev_backup_prepare(BlkTransactionState *common, Error **errp)
1629 {
1630 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
1631 BlockdevBackup *backup;
1632 BlockDriverState *bs, *target;
1633 BlockBackend *blk;
1634 Error *local_err = NULL;
1635
1636 assert(common->action->kind == TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP);
1637 backup = common->action->blockdev_backup;
1638
1639 blk = blk_by_name(backup->device);
1640 if (!blk) {
1641 error_setg(errp, "Device '%s' not found", backup->device);
1642 return;
1643 }
1644 bs = blk_bs(blk);
1645
1646 blk = blk_by_name(backup->target);
1647 if (!blk) {
1648 error_setg(errp, "Device '%s' not found", backup->target);
1649 return;
1650 }
1651 target = blk_bs(blk);
1652
1653 /* AioContext is released in .clean() */
1654 state->aio_context = bdrv_get_aio_context(bs);
1655 if (state->aio_context != bdrv_get_aio_context(target)) {
1656 state->aio_context = NULL;
1657 error_setg(errp, "Backup between two IO threads is not implemented");
1658 return;
1659 }
1660 aio_context_acquire(state->aio_context);
1661
1662 qmp_blockdev_backup(backup->device, backup->target,
1663 backup->sync,
1664 backup->has_speed, backup->speed,
1665 backup->has_on_source_error, backup->on_source_error,
1666 backup->has_on_target_error, backup->on_target_error,
1667 &local_err);
1668 if (local_err) {
1669 error_propagate(errp, local_err);
1670 return;
1671 }
1672
1673 state->bs = bs;
1674 state->job = state->bs->job;
1675 }
1676
1677 static void blockdev_backup_abort(BlkTransactionState *common)
1678 {
1679 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
1680 BlockDriverState *bs = state->bs;
1681
1682 /* Only cancel if it's the job we started */
1683 if (bs && bs->job && bs->job == state->job) {
1684 block_job_cancel_sync(bs->job);
1685 }
1686 }
1687
1688 static void blockdev_backup_clean(BlkTransactionState *common)
1689 {
1690 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
1691
1692 if (state->aio_context) {
1693 aio_context_release(state->aio_context);
1694 }
1695 }
1696
1697 static void abort_prepare(BlkTransactionState *common, Error **errp)
1698 {
1699 error_setg(errp, "Transaction aborted using Abort action");
1700 }
1701
1702 static void abort_commit(BlkTransactionState *common)
1703 {
1704 g_assert_not_reached(); /* this action never succeeds */
1705 }
1706
1707 static const BdrvActionOps actions[] = {
1708 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC] = {
1709 .instance_size = sizeof(ExternalSnapshotState),
1710 .prepare = external_snapshot_prepare,
1711 .commit = external_snapshot_commit,
1712 .abort = external_snapshot_abort,
1713 },
1714 [TRANSACTION_ACTION_KIND_DRIVE_BACKUP] = {
1715 .instance_size = sizeof(DriveBackupState),
1716 .prepare = drive_backup_prepare,
1717 .abort = drive_backup_abort,
1718 .clean = drive_backup_clean,
1719 },
1720 [TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP] = {
1721 .instance_size = sizeof(BlockdevBackupState),
1722 .prepare = blockdev_backup_prepare,
1723 .abort = blockdev_backup_abort,
1724 .clean = blockdev_backup_clean,
1725 },
1726 [TRANSACTION_ACTION_KIND_ABORT] = {
1727 .instance_size = sizeof(BlkTransactionState),
1728 .prepare = abort_prepare,
1729 .commit = abort_commit,
1730 },
1731 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC] = {
1732 .instance_size = sizeof(InternalSnapshotState),
1733 .prepare = internal_snapshot_prepare,
1734 .abort = internal_snapshot_abort,
1735 .clean = internal_snapshot_clean,
1736 },
1737 };
1738
1739 /*
1740 * 'Atomic' group operations. The operations are performed as a set, and if
1741 * any fail then we roll back all operations in the group.
1742 */
1743 void qmp_transaction(TransactionActionList *dev_list, Error **errp)
1744 {
1745 TransactionActionList *dev_entry = dev_list;
1746 BlkTransactionState *state, *next;
1747 Error *local_err = NULL;
1748
1749 QSIMPLEQ_HEAD(snap_bdrv_states, BlkTransactionState) snap_bdrv_states;
1750 QSIMPLEQ_INIT(&snap_bdrv_states);
1751
1752 /* drain all i/o before any operations */
1753 bdrv_drain_all();
1754
1755 /* We don't do anything in this loop that commits us to the operations */
1756 while (NULL != dev_entry) {
1757 TransactionAction *dev_info = NULL;
1758 const BdrvActionOps *ops;
1759
1760 dev_info = dev_entry->value;
1761 dev_entry = dev_entry->next;
1762
1763 assert(dev_info->kind < ARRAY_SIZE(actions));
1764
1765 ops = &actions[dev_info->kind];
1766 assert(ops->instance_size > 0);
1767
1768 state = g_malloc0(ops->instance_size);
1769 state->ops = ops;
1770 state->action = dev_info;
1771 QSIMPLEQ_INSERT_TAIL(&snap_bdrv_states, state, entry);
1772
1773 state->ops->prepare(state, &local_err);
1774 if (local_err) {
1775 error_propagate(errp, local_err);
1776 goto delete_and_fail;
1777 }
1778 }
1779
1780 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) {
1781 if (state->ops->commit) {
1782 state->ops->commit(state);
1783 }
1784 }
1785
1786 /* success */
1787 goto exit;
1788
1789 delete_and_fail:
1790 /* failure, and it is all-or-none; roll back all operations */
1791 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) {
1792 if (state->ops->abort) {
1793 state->ops->abort(state);
1794 }
1795 }
1796 exit:
1797 QSIMPLEQ_FOREACH_SAFE(state, &snap_bdrv_states, entry, next) {
1798 if (state->ops->clean) {
1799 state->ops->clean(state);
1800 }
1801 g_free(state);
1802 }
1803 }
1804
1805
1806 static void eject_device(BlockBackend *blk, int force, Error **errp)
1807 {
1808 BlockDriverState *bs = blk_bs(blk);
1809 AioContext *aio_context;
1810
1811 aio_context = bdrv_get_aio_context(bs);
1812 aio_context_acquire(aio_context);
1813
1814 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_EJECT, errp)) {
1815 goto out;
1816 }
1817 if (!blk_dev_has_removable_media(blk)) {
1818 error_setg(errp, "Device '%s' is not removable",
1819 bdrv_get_device_name(bs));
1820 goto out;
1821 }
1822
1823 if (blk_dev_is_medium_locked(blk) && !blk_dev_is_tray_open(blk)) {
1824 blk_dev_eject_request(blk, force);
1825 if (!force) {
1826 error_setg(errp, "Device '%s' is locked",
1827 bdrv_get_device_name(bs));
1828 goto out;
1829 }
1830 }
1831
1832 bdrv_close(bs);
1833
1834 out:
1835 aio_context_release(aio_context);
1836 }
1837
1838 void qmp_eject(const char *device, bool has_force, bool force, Error **errp)
1839 {
1840 BlockBackend *blk;
1841
1842 blk = blk_by_name(device);
1843 if (!blk) {
1844 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1845 return;
1846 }
1847
1848 eject_device(blk, force, errp);
1849 }
1850
1851 void qmp_block_passwd(bool has_device, const char *device,
1852 bool has_node_name, const char *node_name,
1853 const char *password, Error **errp)
1854 {
1855 Error *local_err = NULL;
1856 BlockDriverState *bs;
1857 AioContext *aio_context;
1858
1859 bs = bdrv_lookup_bs(has_device ? device : NULL,
1860 has_node_name ? node_name : NULL,
1861 &local_err);
1862 if (local_err) {
1863 error_propagate(errp, local_err);
1864 return;
1865 }
1866
1867 aio_context = bdrv_get_aio_context(bs);
1868 aio_context_acquire(aio_context);
1869
1870 bdrv_add_key(bs, password, errp);
1871
1872 aio_context_release(aio_context);
1873 }
1874
1875 /* Assumes AioContext is held */
1876 static void qmp_bdrv_open_encrypted(BlockDriverState *bs, const char *filename,
1877 int bdrv_flags, BlockDriver *drv,
1878 const char *password, Error **errp)
1879 {
1880 Error *local_err = NULL;
1881 int ret;
1882
1883 ret = bdrv_open(&bs, filename, NULL, NULL, bdrv_flags, drv, &local_err);
1884 if (ret < 0) {
1885 error_propagate(errp, local_err);
1886 return;
1887 }
1888
1889 bdrv_add_key(bs, password, errp);
1890 }
1891
1892 void qmp_change_blockdev(const char *device, const char *filename,
1893 const char *format, Error **errp)
1894 {
1895 BlockBackend *blk;
1896 BlockDriverState *bs;
1897 AioContext *aio_context;
1898 BlockDriver *drv = NULL;
1899 int bdrv_flags;
1900 Error *err = NULL;
1901
1902 blk = blk_by_name(device);
1903 if (!blk) {
1904 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1905 return;
1906 }
1907 bs = blk_bs(blk);
1908
1909 aio_context = bdrv_get_aio_context(bs);
1910 aio_context_acquire(aio_context);
1911
1912 if (format) {
1913 drv = bdrv_find_whitelisted_format(format, bs->read_only);
1914 if (!drv) {
1915 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
1916 goto out;
1917 }
1918 }
1919
1920 eject_device(blk, 0, &err);
1921 if (err) {
1922 error_propagate(errp, err);
1923 goto out;
1924 }
1925
1926 bdrv_flags = bdrv_is_read_only(bs) ? 0 : BDRV_O_RDWR;
1927 bdrv_flags |= bdrv_is_snapshot(bs) ? BDRV_O_SNAPSHOT : 0;
1928
1929 qmp_bdrv_open_encrypted(bs, filename, bdrv_flags, drv, NULL, errp);
1930
1931 out:
1932 aio_context_release(aio_context);
1933 }
1934
1935 /* throttling disk I/O limits */
1936 void qmp_block_set_io_throttle(const char *device, int64_t bps, int64_t bps_rd,
1937 int64_t bps_wr,
1938 int64_t iops,
1939 int64_t iops_rd,
1940 int64_t iops_wr,
1941 bool has_bps_max,
1942 int64_t bps_max,
1943 bool has_bps_rd_max,
1944 int64_t bps_rd_max,
1945 bool has_bps_wr_max,
1946 int64_t bps_wr_max,
1947 bool has_iops_max,
1948 int64_t iops_max,
1949 bool has_iops_rd_max,
1950 int64_t iops_rd_max,
1951 bool has_iops_wr_max,
1952 int64_t iops_wr_max,
1953 bool has_iops_size,
1954 int64_t iops_size, Error **errp)
1955 {
1956 ThrottleConfig cfg;
1957 BlockDriverState *bs;
1958 BlockBackend *blk;
1959 AioContext *aio_context;
1960
1961 blk = blk_by_name(device);
1962 if (!blk) {
1963 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1964 return;
1965 }
1966 bs = blk_bs(blk);
1967
1968 memset(&cfg, 0, sizeof(cfg));
1969 cfg.buckets[THROTTLE_BPS_TOTAL].avg = bps;
1970 cfg.buckets[THROTTLE_BPS_READ].avg = bps_rd;
1971 cfg.buckets[THROTTLE_BPS_WRITE].avg = bps_wr;
1972
1973 cfg.buckets[THROTTLE_OPS_TOTAL].avg = iops;
1974 cfg.buckets[THROTTLE_OPS_READ].avg = iops_rd;
1975 cfg.buckets[THROTTLE_OPS_WRITE].avg = iops_wr;
1976
1977 if (has_bps_max) {
1978 cfg.buckets[THROTTLE_BPS_TOTAL].max = bps_max;
1979 }
1980 if (has_bps_rd_max) {
1981 cfg.buckets[THROTTLE_BPS_READ].max = bps_rd_max;
1982 }
1983 if (has_bps_wr_max) {
1984 cfg.buckets[THROTTLE_BPS_WRITE].max = bps_wr_max;
1985 }
1986 if (has_iops_max) {
1987 cfg.buckets[THROTTLE_OPS_TOTAL].max = iops_max;
1988 }
1989 if (has_iops_rd_max) {
1990 cfg.buckets[THROTTLE_OPS_READ].max = iops_rd_max;
1991 }
1992 if (has_iops_wr_max) {
1993 cfg.buckets[THROTTLE_OPS_WRITE].max = iops_wr_max;
1994 }
1995
1996 if (has_iops_size) {
1997 cfg.op_size = iops_size;
1998 }
1999
2000 if (!check_throttle_config(&cfg, errp)) {
2001 return;
2002 }
2003
2004 aio_context = bdrv_get_aio_context(bs);
2005 aio_context_acquire(aio_context);
2006
2007 if (!bs->io_limits_enabled && throttle_enabled(&cfg)) {
2008 bdrv_io_limits_enable(bs);
2009 } else if (bs->io_limits_enabled && !throttle_enabled(&cfg)) {
2010 bdrv_io_limits_disable(bs);
2011 }
2012
2013 if (bs->io_limits_enabled) {
2014 bdrv_set_io_limits(bs, &cfg);
2015 }
2016
2017 aio_context_release(aio_context);
2018 }
2019
2020 void qmp_block_dirty_bitmap_add(const char *node, const char *name,
2021 bool has_granularity, uint32_t granularity,
2022 Error **errp)
2023 {
2024 AioContext *aio_context;
2025 BlockDriverState *bs;
2026
2027 if (!name || name[0] == '\0') {
2028 error_setg(errp, "Bitmap name cannot be empty");
2029 return;
2030 }
2031
2032 bs = bdrv_lookup_bs(node, node, errp);
2033 if (!bs) {
2034 return;
2035 }
2036
2037 aio_context = bdrv_get_aio_context(bs);
2038 aio_context_acquire(aio_context);
2039
2040 if (has_granularity) {
2041 if (granularity < 512 || !is_power_of_2(granularity)) {
2042 error_setg(errp, "Granularity must be power of 2 "
2043 "and at least 512");
2044 goto out;
2045 }
2046 } else {
2047 /* Default to cluster size, if available: */
2048 granularity = bdrv_get_default_bitmap_granularity(bs);
2049 }
2050
2051 bdrv_create_dirty_bitmap(bs, granularity, name, errp);
2052
2053 out:
2054 aio_context_release(aio_context);
2055 }
2056
2057 void qmp_block_dirty_bitmap_remove(const char *node, const char *name,
2058 Error **errp)
2059 {
2060 AioContext *aio_context;
2061 BlockDriverState *bs;
2062 BdrvDirtyBitmap *bitmap;
2063
2064 bitmap = block_dirty_bitmap_lookup(node, name, &bs, &aio_context, errp);
2065 if (!bitmap || !bs) {
2066 return;
2067 }
2068
2069 if (bdrv_dirty_bitmap_frozen(bitmap)) {
2070 error_setg(errp,
2071 "Bitmap '%s' is currently frozen and cannot be removed",
2072 name);
2073 goto out;
2074 }
2075 bdrv_dirty_bitmap_make_anon(bitmap);
2076 bdrv_release_dirty_bitmap(bs, bitmap);
2077
2078 out:
2079 aio_context_release(aio_context);
2080 }
2081
2082 /**
2083 * Completely clear a bitmap, for the purposes of synchronizing a bitmap
2084 * immediately after a full backup operation.
2085 */
2086 void qmp_block_dirty_bitmap_clear(const char *node, const char *name,
2087 Error **errp)
2088 {
2089 AioContext *aio_context;
2090 BdrvDirtyBitmap *bitmap;
2091 BlockDriverState *bs;
2092
2093 bitmap = block_dirty_bitmap_lookup(node, name, &bs, &aio_context, errp);
2094 if (!bitmap || !bs) {
2095 return;
2096 }
2097
2098 if (bdrv_dirty_bitmap_frozen(bitmap)) {
2099 error_setg(errp,
2100 "Bitmap '%s' is currently frozen and cannot be modified",
2101 name);
2102 goto out;
2103 } else if (!bdrv_dirty_bitmap_enabled(bitmap)) {
2104 error_setg(errp,
2105 "Bitmap '%s' is currently disabled and cannot be cleared",
2106 name);
2107 goto out;
2108 }
2109
2110 bdrv_clear_dirty_bitmap(bitmap);
2111
2112 out:
2113 aio_context_release(aio_context);
2114 }
2115
2116 int hmp_drive_del(Monitor *mon, const QDict *qdict, QObject **ret_data)
2117 {
2118 const char *id = qdict_get_str(qdict, "id");
2119 BlockBackend *blk;
2120 BlockDriverState *bs;
2121 AioContext *aio_context;
2122 Error *local_err = NULL;
2123
2124 blk = blk_by_name(id);
2125 if (!blk) {
2126 error_report("Device '%s' not found", id);
2127 return -1;
2128 }
2129 bs = blk_bs(blk);
2130
2131 if (!blk_legacy_dinfo(blk)) {
2132 error_report("Deleting device added with blockdev-add"
2133 " is not supported");
2134 return -1;
2135 }
2136
2137 aio_context = bdrv_get_aio_context(bs);
2138 aio_context_acquire(aio_context);
2139
2140 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_DRIVE_DEL, &local_err)) {
2141 error_report_err(local_err);
2142 aio_context_release(aio_context);
2143 return -1;
2144 }
2145
2146 /* quiesce block driver; prevent further io */
2147 bdrv_drain_all();
2148 bdrv_flush(bs);
2149 bdrv_close(bs);
2150
2151 /* if we have a device attached to this BlockDriverState
2152 * then we need to make the drive anonymous until the device
2153 * can be removed. If this is a drive with no device backing
2154 * then we can just get rid of the block driver state right here.
2155 */
2156 if (blk_get_attached_dev(blk)) {
2157 blk_hide_on_behalf_of_hmp_drive_del(blk);
2158 /* Further I/O must not pause the guest */
2159 bdrv_set_on_error(bs, BLOCKDEV_ON_ERROR_REPORT,
2160 BLOCKDEV_ON_ERROR_REPORT);
2161 } else {
2162 blk_unref(blk);
2163 }
2164
2165 aio_context_release(aio_context);
2166 return 0;
2167 }
2168
2169 void qmp_block_resize(bool has_device, const char *device,
2170 bool has_node_name, const char *node_name,
2171 int64_t size, Error **errp)
2172 {
2173 Error *local_err = NULL;
2174 BlockDriverState *bs;
2175 AioContext *aio_context;
2176 int ret;
2177
2178 bs = bdrv_lookup_bs(has_device ? device : NULL,
2179 has_node_name ? node_name : NULL,
2180 &local_err);
2181 if (local_err) {
2182 error_propagate(errp, local_err);
2183 return;
2184 }
2185
2186 aio_context = bdrv_get_aio_context(bs);
2187 aio_context_acquire(aio_context);
2188
2189 if (!bdrv_is_first_non_filter(bs)) {
2190 error_set(errp, QERR_FEATURE_DISABLED, "resize");
2191 goto out;
2192 }
2193
2194 if (size < 0) {
2195 error_set(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size");
2196 goto out;
2197 }
2198
2199 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_RESIZE, NULL)) {
2200 error_set(errp, QERR_DEVICE_IN_USE, device);
2201 goto out;
2202 }
2203
2204 /* complete all in-flight operations before resizing the device */
2205 bdrv_drain_all();
2206
2207 ret = bdrv_truncate(bs, size);
2208 switch (ret) {
2209 case 0:
2210 break;
2211 case -ENOMEDIUM:
2212 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
2213 break;
2214 case -ENOTSUP:
2215 error_set(errp, QERR_UNSUPPORTED);
2216 break;
2217 case -EACCES:
2218 error_setg(errp, "Device '%s' is read only", device);
2219 break;
2220 case -EBUSY:
2221 error_set(errp, QERR_DEVICE_IN_USE, device);
2222 break;
2223 default:
2224 error_setg_errno(errp, -ret, "Could not resize");
2225 break;
2226 }
2227
2228 out:
2229 aio_context_release(aio_context);
2230 }
2231
2232 static void block_job_cb(void *opaque, int ret)
2233 {
2234 /* Note that this function may be executed from another AioContext besides
2235 * the QEMU main loop. If you need to access anything that assumes the
2236 * QEMU global mutex, use a BH or introduce a mutex.
2237 */
2238
2239 BlockDriverState *bs = opaque;
2240 const char *msg = NULL;
2241
2242 trace_block_job_cb(bs, bs->job, ret);
2243
2244 assert(bs->job);
2245
2246 if (ret < 0) {
2247 msg = strerror(-ret);
2248 }
2249
2250 if (block_job_is_cancelled(bs->job)) {
2251 block_job_event_cancelled(bs->job);
2252 } else {
2253 block_job_event_completed(bs->job, msg);
2254 }
2255
2256 bdrv_put_ref_bh_schedule(bs);
2257 }
2258
2259 void qmp_block_stream(const char *device,
2260 bool has_base, const char *base,
2261 bool has_backing_file, const char *backing_file,
2262 bool has_speed, int64_t speed,
2263 bool has_on_error, BlockdevOnError on_error,
2264 Error **errp)
2265 {
2266 BlockBackend *blk;
2267 BlockDriverState *bs;
2268 BlockDriverState *base_bs = NULL;
2269 AioContext *aio_context;
2270 Error *local_err = NULL;
2271 const char *base_name = NULL;
2272
2273 if (!has_on_error) {
2274 on_error = BLOCKDEV_ON_ERROR_REPORT;
2275 }
2276
2277 blk = blk_by_name(device);
2278 if (!blk) {
2279 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
2280 return;
2281 }
2282 bs = blk_bs(blk);
2283
2284 aio_context = bdrv_get_aio_context(bs);
2285 aio_context_acquire(aio_context);
2286
2287 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_STREAM, errp)) {
2288 goto out;
2289 }
2290
2291 if (has_base) {
2292 base_bs = bdrv_find_backing_image(bs, base);
2293 if (base_bs == NULL) {
2294 error_set(errp, QERR_BASE_NOT_FOUND, base);
2295 goto out;
2296 }
2297 assert(bdrv_get_aio_context(base_bs) == aio_context);
2298 base_name = base;
2299 }
2300
2301 /* if we are streaming the entire chain, the result will have no backing
2302 * file, and specifying one is therefore an error */
2303 if (base_bs == NULL && has_backing_file) {
2304 error_setg(errp, "backing file specified, but streaming the "
2305 "entire chain");
2306 goto out;
2307 }
2308
2309 /* backing_file string overrides base bs filename */
2310 base_name = has_backing_file ? backing_file : base_name;
2311
2312 stream_start(bs, base_bs, base_name, has_speed ? speed : 0,
2313 on_error, block_job_cb, bs, &local_err);
2314 if (local_err) {
2315 error_propagate(errp, local_err);
2316 goto out;
2317 }
2318
2319 trace_qmp_block_stream(bs, bs->job);
2320
2321 out:
2322 aio_context_release(aio_context);
2323 }
2324
2325 void qmp_block_commit(const char *device,
2326 bool has_base, const char *base,
2327 bool has_top, const char *top,
2328 bool has_backing_file, const char *backing_file,
2329 bool has_speed, int64_t speed,
2330 Error **errp)
2331 {
2332 BlockBackend *blk;
2333 BlockDriverState *bs;
2334 BlockDriverState *base_bs, *top_bs;
2335 AioContext *aio_context;
2336 Error *local_err = NULL;
2337 /* This will be part of the QMP command, if/when the
2338 * BlockdevOnError change for blkmirror makes it in
2339 */
2340 BlockdevOnError on_error = BLOCKDEV_ON_ERROR_REPORT;
2341
2342 if (!has_speed) {
2343 speed = 0;
2344 }
2345
2346 /* Important Note:
2347 * libvirt relies on the DeviceNotFound error class in order to probe for
2348 * live commit feature versions; for this to work, we must make sure to
2349 * perform the device lookup before any generic errors that may occur in a
2350 * scenario in which all optional arguments are omitted. */
2351 blk = blk_by_name(device);
2352 if (!blk) {
2353 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
2354 return;
2355 }
2356 bs = blk_bs(blk);
2357
2358 aio_context = bdrv_get_aio_context(bs);
2359 aio_context_acquire(aio_context);
2360
2361 /* drain all i/o before commits */
2362 bdrv_drain_all();
2363
2364 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_COMMIT_SOURCE, errp)) {
2365 goto out;
2366 }
2367
2368 /* default top_bs is the active layer */
2369 top_bs = bs;
2370
2371 if (has_top && top) {
2372 if (strcmp(bs->filename, top) != 0) {
2373 top_bs = bdrv_find_backing_image(bs, top);
2374 }
2375 }
2376
2377 if (top_bs == NULL) {
2378 error_setg(errp, "Top image file %s not found", top ? top : "NULL");
2379 goto out;
2380 }
2381
2382 assert(bdrv_get_aio_context(top_bs) == aio_context);
2383
2384 if (has_base && base) {
2385 base_bs = bdrv_find_backing_image(top_bs, base);
2386 } else {
2387 base_bs = bdrv_find_base(top_bs);
2388 }
2389
2390 if (base_bs == NULL) {
2391 error_set(errp, QERR_BASE_NOT_FOUND, base ? base : "NULL");
2392 goto out;
2393 }
2394
2395 assert(bdrv_get_aio_context(base_bs) == aio_context);
2396
2397 if (bdrv_op_is_blocked(base_bs, BLOCK_OP_TYPE_COMMIT_TARGET, errp)) {
2398 goto out;
2399 }
2400
2401 /* Do not allow attempts to commit an image into itself */
2402 if (top_bs == base_bs) {
2403 error_setg(errp, "cannot commit an image into itself");
2404 goto out;
2405 }
2406
2407 if (top_bs == bs) {
2408 if (has_backing_file) {
2409 error_setg(errp, "'backing-file' specified,"
2410 " but 'top' is the active layer");
2411 goto out;
2412 }
2413 commit_active_start(bs, base_bs, speed, on_error, block_job_cb,
2414 bs, &local_err);
2415 } else {
2416 commit_start(bs, base_bs, top_bs, speed, on_error, block_job_cb, bs,
2417 has_backing_file ? backing_file : NULL, &local_err);
2418 }
2419 if (local_err != NULL) {
2420 error_propagate(errp, local_err);
2421 goto out;
2422 }
2423
2424 out:
2425 aio_context_release(aio_context);
2426 }
2427
2428 void qmp_drive_backup(const char *device, const char *target,
2429 bool has_format, const char *format,
2430 enum MirrorSyncMode sync,
2431 bool has_mode, enum NewImageMode mode,
2432 bool has_speed, int64_t speed,
2433 bool has_bitmap, const char *bitmap,
2434 bool has_on_source_error, BlockdevOnError on_source_error,
2435 bool has_on_target_error, BlockdevOnError on_target_error,
2436 Error **errp)
2437 {
2438 BlockBackend *blk;
2439 BlockDriverState *bs;
2440 BlockDriverState *target_bs;
2441 BlockDriverState *source = NULL;
2442 BdrvDirtyBitmap *bmap = NULL;
2443 AioContext *aio_context;
2444 BlockDriver *drv = NULL;
2445 Error *local_err = NULL;
2446 int flags;
2447 int64_t size;
2448 int ret;
2449
2450 if (!has_speed) {
2451 speed = 0;
2452 }
2453 if (!has_on_source_error) {
2454 on_source_error = BLOCKDEV_ON_ERROR_REPORT;
2455 }
2456 if (!has_on_target_error) {
2457 on_target_error = BLOCKDEV_ON_ERROR_REPORT;
2458 }
2459 if (!has_mode) {
2460 mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
2461 }
2462
2463 blk = blk_by_name(device);
2464 if (!blk) {
2465 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
2466 return;
2467 }
2468 bs = blk_bs(blk);
2469
2470 aio_context = bdrv_get_aio_context(bs);
2471 aio_context_acquire(aio_context);
2472
2473 /* Although backup_run has this check too, we need to use bs->drv below, so
2474 * do an early check redundantly. */
2475 if (!bdrv_is_inserted(bs)) {
2476 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
2477 goto out;
2478 }
2479
2480 if (!has_format) {
2481 format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name;
2482 }
2483 if (format) {
2484 drv = bdrv_find_format(format);
2485 if (!drv) {
2486 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
2487 goto out;
2488 }
2489 }
2490
2491 /* Early check to avoid creating target */
2492 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_BACKUP_SOURCE, errp)) {
2493 goto out;
2494 }
2495
2496 flags = bs->open_flags | BDRV_O_RDWR;
2497
2498 /* See if we have a backing HD we can use to create our new image
2499 * on top of. */
2500 if (sync == MIRROR_SYNC_MODE_TOP) {
2501 source = bs->backing_hd;
2502 if (!source) {
2503 sync = MIRROR_SYNC_MODE_FULL;
2504 }
2505 }
2506 if (sync == MIRROR_SYNC_MODE_NONE) {
2507 source = bs;
2508 }
2509
2510 size = bdrv_getlength(bs);
2511 if (size < 0) {
2512 error_setg_errno(errp, -size, "bdrv_getlength failed");
2513 goto out;
2514 }
2515
2516 if (mode != NEW_IMAGE_MODE_EXISTING) {
2517 assert(format && drv);
2518 if (source) {
2519 bdrv_img_create(target, format, source->filename,
2520 source->drv->format_name, NULL,
2521 size, flags, &local_err, false);
2522 } else {
2523 bdrv_img_create(target, format, NULL, NULL, NULL,
2524 size, flags, &local_err, false);
2525 }
2526 }
2527
2528 if (local_err) {
2529 error_propagate(errp, local_err);
2530 goto out;
2531 }
2532
2533 target_bs = NULL;
2534 ret = bdrv_open(&target_bs, target, NULL, NULL, flags, drv, &local_err);
2535 if (ret < 0) {
2536 error_propagate(errp, local_err);
2537 goto out;
2538 }
2539
2540 bdrv_set_aio_context(target_bs, aio_context);
2541
2542 if (has_bitmap) {
2543 bmap = bdrv_find_dirty_bitmap(bs, bitmap);
2544 if (!bmap) {
2545 error_setg(errp, "Bitmap '%s' could not be found", bitmap);
2546 goto out;
2547 }
2548 }
2549
2550 backup_start(bs, target_bs, speed, sync, bmap,
2551 on_source_error, on_target_error,
2552 block_job_cb, bs, &local_err);
2553 if (local_err != NULL) {
2554 bdrv_unref(target_bs);
2555 error_propagate(errp, local_err);
2556 goto out;
2557 }
2558
2559 out:
2560 aio_context_release(aio_context);
2561 }
2562
2563 BlockDeviceInfoList *qmp_query_named_block_nodes(Error **errp)
2564 {
2565 return bdrv_named_nodes_list(errp);
2566 }
2567
2568 void qmp_blockdev_backup(const char *device, const char *target,
2569 enum MirrorSyncMode sync,
2570 bool has_speed, int64_t speed,
2571 bool has_on_source_error,
2572 BlockdevOnError on_source_error,
2573 bool has_on_target_error,
2574 BlockdevOnError on_target_error,
2575 Error **errp)
2576 {
2577 BlockBackend *blk;
2578 BlockDriverState *bs;
2579 BlockDriverState *target_bs;
2580 Error *local_err = NULL;
2581 AioContext *aio_context;
2582
2583 if (!has_speed) {
2584 speed = 0;
2585 }
2586 if (!has_on_source_error) {
2587 on_source_error = BLOCKDEV_ON_ERROR_REPORT;
2588 }
2589 if (!has_on_target_error) {
2590 on_target_error = BLOCKDEV_ON_ERROR_REPORT;
2591 }
2592
2593 blk = blk_by_name(device);
2594 if (!blk) {
2595 error_setg(errp, "Device '%s' not found", device);
2596 return;
2597 }
2598 bs = blk_bs(blk);
2599
2600 aio_context = bdrv_get_aio_context(bs);
2601 aio_context_acquire(aio_context);
2602
2603 blk = blk_by_name(target);
2604 if (!blk) {
2605 error_setg(errp, "Device '%s' not found", target);
2606 goto out;
2607 }
2608 target_bs = blk_bs(blk);
2609
2610 bdrv_ref(target_bs);
2611 bdrv_set_aio_context(target_bs, aio_context);
2612 backup_start(bs, target_bs, speed, sync, NULL, on_source_error,
2613 on_target_error, block_job_cb, bs, &local_err);
2614 if (local_err != NULL) {
2615 bdrv_unref(target_bs);
2616 error_propagate(errp, local_err);
2617 }
2618 out:
2619 aio_context_release(aio_context);
2620 }
2621
2622 #define DEFAULT_MIRROR_BUF_SIZE (10 << 20)
2623
2624 void qmp_drive_mirror(const char *device, const char *target,
2625 bool has_format, const char *format,
2626 bool has_node_name, const char *node_name,
2627 bool has_replaces, const char *replaces,
2628 enum MirrorSyncMode sync,
2629 bool has_mode, enum NewImageMode mode,
2630 bool has_speed, int64_t speed,
2631 bool has_granularity, uint32_t granularity,
2632 bool has_buf_size, int64_t buf_size,
2633 bool has_on_source_error, BlockdevOnError on_source_error,
2634 bool has_on_target_error, BlockdevOnError on_target_error,
2635 Error **errp)
2636 {
2637 BlockBackend *blk;
2638 BlockDriverState *bs;
2639 BlockDriverState *source, *target_bs;
2640 AioContext *aio_context;
2641 BlockDriver *drv = NULL;
2642 Error *local_err = NULL;
2643 QDict *options = NULL;
2644 int flags;
2645 int64_t size;
2646 int ret;
2647
2648 if (!has_speed) {
2649 speed = 0;
2650 }
2651 if (!has_on_source_error) {
2652 on_source_error = BLOCKDEV_ON_ERROR_REPORT;
2653 }
2654 if (!has_on_target_error) {
2655 on_target_error = BLOCKDEV_ON_ERROR_REPORT;
2656 }
2657 if (!has_mode) {
2658 mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
2659 }
2660 if (!has_granularity) {
2661 granularity = 0;
2662 }
2663 if (!has_buf_size) {
2664 buf_size = DEFAULT_MIRROR_BUF_SIZE;
2665 }
2666
2667 if (granularity != 0 && (granularity < 512 || granularity > 1048576 * 64)) {
2668 error_set(errp, QERR_INVALID_PARAMETER_VALUE, "granularity",
2669 "a value in range [512B, 64MB]");
2670 return;
2671 }
2672 if (granularity & (granularity - 1)) {
2673 error_set(errp, QERR_INVALID_PARAMETER_VALUE, "granularity", "power of 2");
2674 return;
2675 }
2676
2677 blk = blk_by_name(device);
2678 if (!blk) {
2679 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
2680 return;
2681 }
2682 bs = blk_bs(blk);
2683
2684 aio_context = bdrv_get_aio_context(bs);
2685 aio_context_acquire(aio_context);
2686
2687 if (!bdrv_is_inserted(bs)) {
2688 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
2689 goto out;
2690 }
2691
2692 if (!has_format) {
2693 format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name;
2694 }
2695 if (format) {
2696 drv = bdrv_find_format(format);
2697 if (!drv) {
2698 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
2699 goto out;
2700 }
2701 }
2702
2703 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_MIRROR, errp)) {
2704 goto out;
2705 }
2706
2707 flags = bs->open_flags | BDRV_O_RDWR;
2708 source = bs->backing_hd;
2709 if (!source && sync == MIRROR_SYNC_MODE_TOP) {
2710 sync = MIRROR_SYNC_MODE_FULL;
2711 }
2712 if (sync == MIRROR_SYNC_MODE_NONE) {
2713 source = bs;
2714 }
2715
2716 size = bdrv_getlength(bs);
2717 if (size < 0) {
2718 error_setg_errno(errp, -size, "bdrv_getlength failed");
2719 goto out;
2720 }
2721
2722 if (has_replaces) {
2723 BlockDriverState *to_replace_bs;
2724 AioContext *replace_aio_context;
2725 int64_t replace_size;
2726
2727 if (!has_node_name) {
2728 error_setg(errp, "a node-name must be provided when replacing a"
2729 " named node of the graph");
2730 goto out;
2731 }
2732
2733 to_replace_bs = check_to_replace_node(replaces, &local_err);
2734
2735 if (!to_replace_bs) {
2736 error_propagate(errp, local_err);
2737 goto out;
2738 }
2739
2740 replace_aio_context = bdrv_get_aio_context(to_replace_bs);
2741 aio_context_acquire(replace_aio_context);
2742 replace_size = bdrv_getlength(to_replace_bs);
2743 aio_context_release(replace_aio_context);
2744
2745 if (size != replace_size) {
2746 error_setg(errp, "cannot replace image with a mirror image of "
2747 "different size");
2748 goto out;
2749 }
2750 }
2751
2752 if ((sync == MIRROR_SYNC_MODE_FULL || !source)
2753 && mode != NEW_IMAGE_MODE_EXISTING)
2754 {
2755 /* create new image w/o backing file */
2756 assert(format && drv);
2757 bdrv_img_create(target, format,
2758 NULL, NULL, NULL, size, flags, &local_err, false);
2759 } else {
2760 switch (mode) {
2761 case NEW_IMAGE_MODE_EXISTING:
2762 break;
2763 case NEW_IMAGE_MODE_ABSOLUTE_PATHS:
2764 /* create new image with backing file */
2765 bdrv_img_create(target, format,
2766 source->filename,
2767 source->drv->format_name,
2768 NULL, size, flags, &local_err, false);
2769 break;
2770 default:
2771 abort();
2772 }
2773 }
2774
2775 if (local_err) {
2776 error_propagate(errp, local_err);
2777 goto out;
2778 }
2779
2780 if (has_node_name) {
2781 options = qdict_new();
2782 qdict_put(options, "node-name", qstring_from_str(node_name));
2783 }
2784
2785 /* Mirroring takes care of copy-on-write using the source's backing
2786 * file.
2787 */
2788 target_bs = NULL;
2789 ret = bdrv_open(&target_bs, target, NULL, options,
2790 flags | BDRV_O_NO_BACKING, drv, &local_err);
2791 if (ret < 0) {
2792 error_propagate(errp, local_err);
2793 goto out;
2794 }
2795
2796 bdrv_set_aio_context(target_bs, aio_context);
2797
2798 /* pass the node name to replace to mirror start since it's loose coupling
2799 * and will allow to check whether the node still exist at mirror completion
2800 */
2801 mirror_start(bs, target_bs,
2802 has_replaces ? replaces : NULL,
2803 speed, granularity, buf_size, sync,
2804 on_source_error, on_target_error,
2805 block_job_cb, bs, &local_err);
2806 if (local_err != NULL) {
2807 bdrv_unref(target_bs);
2808 error_propagate(errp, local_err);
2809 goto out;
2810 }
2811
2812 out:
2813 aio_context_release(aio_context);
2814 }
2815
2816 /* Get the block job for a given device name and acquire its AioContext */
2817 static BlockJob *find_block_job(const char *device, AioContext **aio_context,
2818 Error **errp)
2819 {
2820 BlockBackend *blk;
2821 BlockDriverState *bs;
2822
2823 blk = blk_by_name(device);
2824 if (!blk) {
2825 goto notfound;
2826 }
2827 bs = blk_bs(blk);
2828
2829 *aio_context = bdrv_get_aio_context(bs);
2830 aio_context_acquire(*aio_context);
2831
2832 if (!bs->job) {
2833 aio_context_release(*aio_context);
2834 goto notfound;
2835 }
2836
2837 return bs->job;
2838
2839 notfound:
2840 error_set(errp, ERROR_CLASS_DEVICE_NOT_ACTIVE,
2841 "No active block job on device '%s'", device);
2842 *aio_context = NULL;
2843 return NULL;
2844 }
2845
2846 void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp)
2847 {
2848 AioContext *aio_context;
2849 BlockJob *job = find_block_job(device, &aio_context, errp);
2850
2851 if (!job) {
2852 return;
2853 }
2854
2855 block_job_set_speed(job, speed, errp);
2856 aio_context_release(aio_context);
2857 }
2858
2859 void qmp_block_job_cancel(const char *device,
2860 bool has_force, bool force, Error **errp)
2861 {
2862 AioContext *aio_context;
2863 BlockJob *job = find_block_job(device, &aio_context, errp);
2864
2865 if (!job) {
2866 return;
2867 }
2868
2869 if (!has_force) {
2870 force = false;
2871 }
2872
2873 if (job->user_paused && !force) {
2874 error_setg(errp, "The block job for device '%s' is currently paused",
2875 device);
2876 goto out;
2877 }
2878
2879 trace_qmp_block_job_cancel(job);
2880 block_job_cancel(job);
2881 out:
2882 aio_context_release(aio_context);
2883 }
2884
2885 void qmp_block_job_pause(const char *device, Error **errp)
2886 {
2887 AioContext *aio_context;
2888 BlockJob *job = find_block_job(device, &aio_context, errp);
2889
2890 if (!job || job->user_paused) {
2891 return;
2892 }
2893
2894 job->user_paused = true;
2895 trace_qmp_block_job_pause(job);
2896 block_job_pause(job);
2897 aio_context_release(aio_context);
2898 }
2899
2900 void qmp_block_job_resume(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 = false;
2910 trace_qmp_block_job_resume(job);
2911 block_job_resume(job);
2912 aio_context_release(aio_context);
2913 }
2914
2915 void qmp_block_job_complete(const char *device, Error **errp)
2916 {
2917 AioContext *aio_context;
2918 BlockJob *job = find_block_job(device, &aio_context, errp);
2919
2920 if (!job) {
2921 return;
2922 }
2923
2924 trace_qmp_block_job_complete(job);
2925 block_job_complete(job, errp);
2926 aio_context_release(aio_context);
2927 }
2928
2929 void qmp_change_backing_file(const char *device,
2930 const char *image_node_name,
2931 const char *backing_file,
2932 Error **errp)
2933 {
2934 BlockBackend *blk;
2935 BlockDriverState *bs = NULL;
2936 AioContext *aio_context;
2937 BlockDriverState *image_bs = NULL;
2938 Error *local_err = NULL;
2939 bool ro;
2940 int open_flags;
2941 int ret;
2942
2943 blk = blk_by_name(device);
2944 if (!blk) {
2945 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
2946 return;
2947 }
2948 bs = blk_bs(blk);
2949
2950 aio_context = bdrv_get_aio_context(bs);
2951 aio_context_acquire(aio_context);
2952
2953 image_bs = bdrv_lookup_bs(NULL, image_node_name, &local_err);
2954 if (local_err) {
2955 error_propagate(errp, local_err);
2956 goto out;
2957 }
2958
2959 if (!image_bs) {
2960 error_setg(errp, "image file not found");
2961 goto out;
2962 }
2963
2964 if (bdrv_find_base(image_bs) == image_bs) {
2965 error_setg(errp, "not allowing backing file change on an image "
2966 "without a backing file");
2967 goto out;
2968 }
2969
2970 /* even though we are not necessarily operating on bs, we need it to
2971 * determine if block ops are currently prohibited on the chain */
2972 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_CHANGE, errp)) {
2973 goto out;
2974 }
2975
2976 /* final sanity check */
2977 if (!bdrv_chain_contains(bs, image_bs)) {
2978 error_setg(errp, "'%s' and image file are not in the same chain",
2979 device);
2980 goto out;
2981 }
2982
2983 /* if not r/w, reopen to make r/w */
2984 open_flags = image_bs->open_flags;
2985 ro = bdrv_is_read_only(image_bs);
2986
2987 if (ro) {
2988 bdrv_reopen(image_bs, open_flags | BDRV_O_RDWR, &local_err);
2989 if (local_err) {
2990 error_propagate(errp, local_err);
2991 goto out;
2992 }
2993 }
2994
2995 ret = bdrv_change_backing_file(image_bs, backing_file,
2996 image_bs->drv ? image_bs->drv->format_name : "");
2997
2998 if (ret < 0) {
2999 error_setg_errno(errp, -ret, "Could not change backing file to '%s'",
3000 backing_file);
3001 /* don't exit here, so we can try to restore open flags if
3002 * appropriate */
3003 }
3004
3005 if (ro) {
3006 bdrv_reopen(image_bs, open_flags, &local_err);
3007 if (local_err) {
3008 error_propagate(errp, local_err); /* will preserve prior errp */
3009 }
3010 }
3011
3012 out:
3013 aio_context_release(aio_context);
3014 }
3015
3016 void qmp_blockdev_add(BlockdevOptions *options, Error **errp)
3017 {
3018 QmpOutputVisitor *ov = qmp_output_visitor_new();
3019 BlockBackend *blk;
3020 QObject *obj;
3021 QDict *qdict;
3022 Error *local_err = NULL;
3023
3024 /* Require an ID in the top level */
3025 if (!options->has_id) {
3026 error_setg(errp, "Block device needs an ID");
3027 goto fail;
3028 }
3029
3030 /* TODO Sort it out in raw-posix and drive_new(): Reject aio=native with
3031 * cache.direct=false instead of silently switching to aio=threads, except
3032 * when called from drive_new().
3033 *
3034 * For now, simply forbidding the combination for all drivers will do. */
3035 if (options->has_aio && options->aio == BLOCKDEV_AIO_OPTIONS_NATIVE) {
3036 bool direct = options->has_cache &&
3037 options->cache->has_direct &&
3038 options->cache->direct;
3039 if (!direct) {
3040 error_setg(errp, "aio=native requires cache.direct=true");
3041 goto fail;
3042 }
3043 }
3044
3045 visit_type_BlockdevOptions(qmp_output_get_visitor(ov),
3046 &options, NULL, &local_err);
3047 if (local_err) {
3048 error_propagate(errp, local_err);
3049 goto fail;
3050 }
3051
3052 obj = qmp_output_get_qobject(ov);
3053 qdict = qobject_to_qdict(obj);
3054
3055 qdict_flatten(qdict);
3056
3057 blk = blockdev_init(NULL, qdict, &local_err);
3058 if (local_err) {
3059 error_propagate(errp, local_err);
3060 goto fail;
3061 }
3062
3063 if (bdrv_key_required(blk_bs(blk))) {
3064 blk_unref(blk);
3065 error_setg(errp, "blockdev-add doesn't support encrypted devices");
3066 goto fail;
3067 }
3068
3069 fail:
3070 qmp_output_visitor_cleanup(ov);
3071 }
3072
3073 BlockJobInfoList *qmp_query_block_jobs(Error **errp)
3074 {
3075 BlockJobInfoList *head = NULL, **p_next = &head;
3076 BlockDriverState *bs;
3077
3078 for (bs = bdrv_next(NULL); bs; bs = bdrv_next(bs)) {
3079 AioContext *aio_context = bdrv_get_aio_context(bs);
3080
3081 aio_context_acquire(aio_context);
3082
3083 if (bs->job) {
3084 BlockJobInfoList *elem = g_new0(BlockJobInfoList, 1);
3085 elem->value = block_job_query(bs->job);
3086 *p_next = elem;
3087 p_next = &elem->next;
3088 }
3089
3090 aio_context_release(aio_context);
3091 }
3092
3093 return head;
3094 }
3095
3096 QemuOptsList qemu_common_drive_opts = {
3097 .name = "drive",
3098 .head = QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts.head),
3099 .desc = {
3100 {
3101 .name = "snapshot",
3102 .type = QEMU_OPT_BOOL,
3103 .help = "enable/disable snapshot mode",
3104 },{
3105 .name = "discard",
3106 .type = QEMU_OPT_STRING,
3107 .help = "discard operation (ignore/off, unmap/on)",
3108 },{
3109 .name = "cache.writeback",
3110 .type = QEMU_OPT_BOOL,
3111 .help = "enables writeback mode for any caches",
3112 },{
3113 .name = "cache.direct",
3114 .type = QEMU_OPT_BOOL,
3115 .help = "enables use of O_DIRECT (bypass the host page cache)",
3116 },{
3117 .name = "cache.no-flush",
3118 .type = QEMU_OPT_BOOL,
3119 .help = "ignore any flush requests for the device",
3120 },{
3121 .name = "aio",
3122 .type = QEMU_OPT_STRING,
3123 .help = "host AIO implementation (threads, native)",
3124 },{
3125 .name = "format",
3126 .type = QEMU_OPT_STRING,
3127 .help = "disk format (raw, qcow2, ...)",
3128 },{
3129 .name = "rerror",
3130 .type = QEMU_OPT_STRING,
3131 .help = "read error action",
3132 },{
3133 .name = "werror",
3134 .type = QEMU_OPT_STRING,
3135 .help = "write error action",
3136 },{
3137 .name = "read-only",
3138 .type = QEMU_OPT_BOOL,
3139 .help = "open drive file as read-only",
3140 },{
3141 .name = "throttling.iops-total",
3142 .type = QEMU_OPT_NUMBER,
3143 .help = "limit total I/O operations per second",
3144 },{
3145 .name = "throttling.iops-read",
3146 .type = QEMU_OPT_NUMBER,
3147 .help = "limit read operations per second",
3148 },{
3149 .name = "throttling.iops-write",
3150 .type = QEMU_OPT_NUMBER,
3151 .help = "limit write operations per second",
3152 },{
3153 .name = "throttling.bps-total",
3154 .type = QEMU_OPT_NUMBER,
3155 .help = "limit total bytes per second",
3156 },{
3157 .name = "throttling.bps-read",
3158 .type = QEMU_OPT_NUMBER,
3159 .help = "limit read bytes per second",
3160 },{
3161 .name = "throttling.bps-write",
3162 .type = QEMU_OPT_NUMBER,
3163 .help = "limit write bytes per second",
3164 },{
3165 .name = "throttling.iops-total-max",
3166 .type = QEMU_OPT_NUMBER,
3167 .help = "I/O operations burst",
3168 },{
3169 .name = "throttling.iops-read-max",
3170 .type = QEMU_OPT_NUMBER,
3171 .help = "I/O operations read burst",
3172 },{
3173 .name = "throttling.iops-write-max",
3174 .type = QEMU_OPT_NUMBER,
3175 .help = "I/O operations write burst",
3176 },{
3177 .name = "throttling.bps-total-max",
3178 .type = QEMU_OPT_NUMBER,
3179 .help = "total bytes burst",
3180 },{
3181 .name = "throttling.bps-read-max",
3182 .type = QEMU_OPT_NUMBER,
3183 .help = "total bytes read burst",
3184 },{
3185 .name = "throttling.bps-write-max",
3186 .type = QEMU_OPT_NUMBER,
3187 .help = "total bytes write burst",
3188 },{
3189 .name = "throttling.iops-size",
3190 .type = QEMU_OPT_NUMBER,
3191 .help = "when limiting by iops max size of an I/O in bytes",
3192 },{
3193 .name = "copy-on-read",
3194 .type = QEMU_OPT_BOOL,
3195 .help = "copy read data from backing file into image file",
3196 },{
3197 .name = "detect-zeroes",
3198 .type = QEMU_OPT_STRING,
3199 .help = "try to optimize zero writes (off, on, unmap)",
3200 },
3201 { /* end of list */ }
3202 },
3203 };
3204
3205 QemuOptsList qemu_drive_opts = {
3206 .name = "drive",
3207 .head = QTAILQ_HEAD_INITIALIZER(qemu_drive_opts.head),
3208 .desc = {
3209 /*
3210 * no elements => accept any params
3211 * validation will happen later
3212 */
3213 { /* end of list */ }
3214 },
3215 };
AR7 emulation for QEMU