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target-i386: Pass X86CPU object to cpu_x86_find_by_name()
[qemu/kevin.git] / blockdev.c
blob7879e8593d783591b1ae062572373758195fe8f3
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/blockdev.h"
34 #include "hw/block/block.h"
35 #include "block/blockjob.h"
36 #include "monitor/monitor.h"
37 #include "qapi/qmp/qerror.h"
38 #include "qemu/option.h"
39 #include "qemu/config-file.h"
40 #include "qapi/qmp/types.h"
41 #include "sysemu/sysemu.h"
42 #include "block/block_int.h"
43 #include "qmp-commands.h"
44 #include "trace.h"
45 #include "sysemu/arch_init.h"
46
47 static QTAILQ_HEAD(drivelist, DriveInfo) drives = QTAILQ_HEAD_INITIALIZER(drives);
48 extern QemuOptsList qemu_common_drive_opts;
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 const 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 * We automatically delete the drive when a device using it gets
83 * unplugged. Questionable feature, but we can't just drop it.
84 * Device models call blockdev_mark_auto_del() to schedule the
85 * automatic deletion, and generic qdev code calls blockdev_auto_del()
86 * when deletion is actually safe.
87 */
88 void blockdev_mark_auto_del(BlockDriverState *bs)
89 {
90 DriveInfo *dinfo = drive_get_by_blockdev(bs);
91
92 if (bs->job) {
93 block_job_cancel(bs->job);
94 }
95 if (dinfo) {
96 dinfo->auto_del = 1;
97 }
98 }
99
100 void blockdev_auto_del(BlockDriverState *bs)
101 {
102 DriveInfo *dinfo = drive_get_by_blockdev(bs);
103
104 if (dinfo && dinfo->auto_del) {
105 drive_put_ref(dinfo);
106 }
107 }
108
109 static int drive_index_to_bus_id(BlockInterfaceType type, int index)
110 {
111 int max_devs = if_max_devs[type];
112 return max_devs ? index / max_devs : 0;
113 }
114
115 static int drive_index_to_unit_id(BlockInterfaceType type, int index)
116 {
117 int max_devs = if_max_devs[type];
118 return max_devs ? index % max_devs : index;
119 }
120
121 QemuOpts *drive_def(const char *optstr)
122 {
123 return qemu_opts_parse(qemu_find_opts("drive"), optstr, 0);
124 }
125
126 QemuOpts *drive_add(BlockInterfaceType type, int index, const char *file,
127 const char *optstr)
128 {
129 QemuOpts *opts;
130 char buf[32];
131
132 opts = drive_def(optstr);
133 if (!opts) {
134 return NULL;
135 }
136 if (type != IF_DEFAULT) {
137 qemu_opt_set(opts, "if", if_name[type]);
138 }
139 if (index >= 0) {
140 snprintf(buf, sizeof(buf), "%d", index);
141 qemu_opt_set(opts, "index", buf);
142 }
143 if (file)
144 qemu_opt_set(opts, "file", file);
145 return opts;
146 }
147
148 DriveInfo *drive_get(BlockInterfaceType type, int bus, int unit)
149 {
150 DriveInfo *dinfo;
151
152 /* seek interface, bus and unit */
153
154 QTAILQ_FOREACH(dinfo, &drives, next) {
155 if (dinfo->type == type &&
156 dinfo->bus == bus &&
157 dinfo->unit == unit)
158 return dinfo;
159 }
160
161 return NULL;
162 }
163
164 DriveInfo *drive_get_by_index(BlockInterfaceType type, int index)
165 {
166 return drive_get(type,
167 drive_index_to_bus_id(type, index),
168 drive_index_to_unit_id(type, index));
169 }
170
171 int drive_get_max_bus(BlockInterfaceType type)
172 {
173 int max_bus;
174 DriveInfo *dinfo;
175
176 max_bus = -1;
177 QTAILQ_FOREACH(dinfo, &drives, next) {
178 if(dinfo->type == type &&
179 dinfo->bus > max_bus)
180 max_bus = dinfo->bus;
181 }
182 return max_bus;
183 }
184
185 /* Get a block device. This should only be used for single-drive devices
186 (e.g. SD/Floppy/MTD). Multi-disk devices (scsi/ide) should use the
187 appropriate bus. */
188 DriveInfo *drive_get_next(BlockInterfaceType type)
189 {
190 static int next_block_unit[IF_COUNT];
191
192 return drive_get(type, 0, next_block_unit[type]++);
193 }
194
195 DriveInfo *drive_get_by_blockdev(BlockDriverState *bs)
196 {
197 DriveInfo *dinfo;
198
199 QTAILQ_FOREACH(dinfo, &drives, next) {
200 if (dinfo->bdrv == bs) {
201 return dinfo;
202 }
203 }
204 return NULL;
205 }
206
207 static void bdrv_format_print(void *opaque, const char *name)
208 {
209 error_printf(" %s", name);
210 }
211
212 static void drive_uninit(DriveInfo *dinfo)
213 {
214 qemu_opts_del(dinfo->opts);
215 bdrv_delete(dinfo->bdrv);
216 g_free(dinfo->id);
217 QTAILQ_REMOVE(&drives, dinfo, next);
218 g_free(dinfo->serial);
219 g_free(dinfo);
220 }
221
222 void drive_put_ref(DriveInfo *dinfo)
223 {
224 assert(dinfo->refcount);
225 if (--dinfo->refcount == 0) {
226 drive_uninit(dinfo);
227 }
228 }
229
230 void drive_get_ref(DriveInfo *dinfo)
231 {
232 dinfo->refcount++;
233 }
234
235 typedef struct {
236 QEMUBH *bh;
237 DriveInfo *dinfo;
238 } DrivePutRefBH;
239
240 static void drive_put_ref_bh(void *opaque)
241 {
242 DrivePutRefBH *s = opaque;
243
244 drive_put_ref(s->dinfo);
245 qemu_bh_delete(s->bh);
246 g_free(s);
247 }
248
249 /*
250 * Release a drive reference in a BH
251 *
252 * It is not possible to use drive_put_ref() from a callback function when the
253 * callers still need the drive. In such cases we schedule a BH to release the
254 * reference.
255 */
256 static void drive_put_ref_bh_schedule(DriveInfo *dinfo)
257 {
258 DrivePutRefBH *s;
259
260 s = g_new(DrivePutRefBH, 1);
261 s->bh = qemu_bh_new(drive_put_ref_bh, s);
262 s->dinfo = dinfo;
263 qemu_bh_schedule(s->bh);
264 }
265
266 static int parse_block_error_action(const char *buf, bool is_read)
267 {
268 if (!strcmp(buf, "ignore")) {
269 return BLOCKDEV_ON_ERROR_IGNORE;
270 } else if (!is_read && !strcmp(buf, "enospc")) {
271 return BLOCKDEV_ON_ERROR_ENOSPC;
272 } else if (!strcmp(buf, "stop")) {
273 return BLOCKDEV_ON_ERROR_STOP;
274 } else if (!strcmp(buf, "report")) {
275 return BLOCKDEV_ON_ERROR_REPORT;
276 } else {
277 error_report("'%s' invalid %s error action",
278 buf, is_read ? "read" : "write");
279 return -1;
280 }
281 }
282
283 static bool do_check_io_limits(BlockIOLimit *io_limits, Error **errp)
284 {
285 bool bps_flag;
286 bool iops_flag;
287
288 assert(io_limits);
289
290 bps_flag = (io_limits->bps[BLOCK_IO_LIMIT_TOTAL] != 0)
291 && ((io_limits->bps[BLOCK_IO_LIMIT_READ] != 0)
292 || (io_limits->bps[BLOCK_IO_LIMIT_WRITE] != 0));
293 iops_flag = (io_limits->iops[BLOCK_IO_LIMIT_TOTAL] != 0)
294 && ((io_limits->iops[BLOCK_IO_LIMIT_READ] != 0)
295 || (io_limits->iops[BLOCK_IO_LIMIT_WRITE] != 0));
296 if (bps_flag || iops_flag) {
297 error_setg(errp, "bps(iops) and bps_rd/bps_wr(iops_rd/iops_wr) "
298 "cannot be used at the same time");
299 return false;
300 }
301
302 if (io_limits->bps[BLOCK_IO_LIMIT_TOTAL] < 0 ||
303 io_limits->bps[BLOCK_IO_LIMIT_WRITE] < 0 ||
304 io_limits->bps[BLOCK_IO_LIMIT_READ] < 0 ||
305 io_limits->iops[BLOCK_IO_LIMIT_TOTAL] < 0 ||
306 io_limits->iops[BLOCK_IO_LIMIT_WRITE] < 0 ||
307 io_limits->iops[BLOCK_IO_LIMIT_READ] < 0) {
308 error_setg(errp, "bps and iops values must be 0 or greater");
309 return false;
310 }
311
312 return true;
313 }
314
315 static DriveInfo *blockdev_init(QemuOpts *all_opts,
316 BlockInterfaceType block_default_type)
317 {
318 const char *buf;
319 const char *file = NULL;
320 const char *serial;
321 const char *mediastr = "";
322 BlockInterfaceType type;
323 enum { MEDIA_DISK, MEDIA_CDROM } media;
324 int bus_id, unit_id;
325 int cyls, heads, secs, translation;
326 int max_devs;
327 int index;
328 int ro = 0;
329 int bdrv_flags = 0;
330 int on_read_error, on_write_error;
331 const char *devaddr;
332 DriveInfo *dinfo;
333 BlockIOLimit io_limits;
334 int snapshot = 0;
335 bool copy_on_read;
336 int ret;
337 Error *error = NULL;
338 QemuOpts *opts;
339 QDict *bs_opts;
340 const char *id;
341 bool has_driver_specific_opts;
342
343 translation = BIOS_ATA_TRANSLATION_AUTO;
344 media = MEDIA_DISK;
345
346 /* Check common options by copying from all_opts to opts, all other options
347 * are stored in bs_opts. */
348 id = qemu_opts_id(all_opts);
349 opts = qemu_opts_create(&qemu_common_drive_opts, id, 1, &error);
350 if (error_is_set(&error)) {
351 qerror_report_err(error);
352 error_free(error);
353 return NULL;
354 }
355
356 bs_opts = qdict_new();
357 qemu_opts_to_qdict(all_opts, bs_opts);
358 qemu_opts_absorb_qdict(opts, bs_opts, &error);
359 if (error_is_set(&error)) {
360 qerror_report_err(error);
361 error_free(error);
362 return NULL;
363 }
364
365 if (id) {
366 qdict_del(bs_opts, "id");
367 }
368
369 has_driver_specific_opts = !!qdict_size(bs_opts);
370
371 /* extract parameters */
372 bus_id = qemu_opt_get_number(opts, "bus", 0);
373 unit_id = qemu_opt_get_number(opts, "unit", -1);
374 index = qemu_opt_get_number(opts, "index", -1);
375
376 cyls = qemu_opt_get_number(opts, "cyls", 0);
377 heads = qemu_opt_get_number(opts, "heads", 0);
378 secs = qemu_opt_get_number(opts, "secs", 0);
379
380 snapshot = qemu_opt_get_bool(opts, "snapshot", 0);
381 ro = qemu_opt_get_bool(opts, "read-only", 0);
382 copy_on_read = qemu_opt_get_bool(opts, "copy-on-read", false);
383
384 file = qemu_opt_get(opts, "file");
385 serial = qemu_opt_get(opts, "serial");
386
387 if ((buf = qemu_opt_get(opts, "if")) != NULL) {
388 for (type = 0; type < IF_COUNT && strcmp(buf, if_name[type]); type++)
389 ;
390 if (type == IF_COUNT) {
391 error_report("unsupported bus type '%s'", buf);
392 return NULL;
393 }
394 } else {
395 type = block_default_type;
396 }
397
398 max_devs = if_max_devs[type];
399
400 if (cyls || heads || secs) {
401 if (cyls < 1) {
402 error_report("invalid physical cyls number");
403 return NULL;
404 }
405 if (heads < 1) {
406 error_report("invalid physical heads number");
407 return NULL;
408 }
409 if (secs < 1) {
410 error_report("invalid physical secs number");
411 return NULL;
412 }
413 }
414
415 if ((buf = qemu_opt_get(opts, "trans")) != NULL) {
416 if (!cyls) {
417 error_report("'%s' trans must be used with cyls, heads and secs",
418 buf);
419 return NULL;
420 }
421 if (!strcmp(buf, "none"))
422 translation = BIOS_ATA_TRANSLATION_NONE;
423 else if (!strcmp(buf, "lba"))
424 translation = BIOS_ATA_TRANSLATION_LBA;
425 else if (!strcmp(buf, "auto"))
426 translation = BIOS_ATA_TRANSLATION_AUTO;
427 else {
428 error_report("'%s' invalid translation type", buf);
429 return NULL;
430 }
431 }
432
433 if ((buf = qemu_opt_get(opts, "media")) != NULL) {
434 if (!strcmp(buf, "disk")) {
435 media = MEDIA_DISK;
436 } else if (!strcmp(buf, "cdrom")) {
437 if (cyls || secs || heads) {
438 error_report("CHS can't be set with media=%s", buf);
439 return NULL;
440 }
441 media = MEDIA_CDROM;
442 } else {
443 error_report("'%s' invalid media", buf);
444 return NULL;
445 }
446 }
447
448 if ((buf = qemu_opt_get(opts, "discard")) != NULL) {
449 if (bdrv_parse_discard_flags(buf, &bdrv_flags) != 0) {
450 error_report("invalid discard option");
451 return NULL;
452 }
453 }
454
455 bdrv_flags = 0;
456 if (qemu_opt_get_bool(opts, "cache.writeback", true)) {
457 bdrv_flags |= BDRV_O_CACHE_WB;
458 }
459 if (qemu_opt_get_bool(opts, "cache.direct", false)) {
460 bdrv_flags |= BDRV_O_NOCACHE;
461 }
462 if (qemu_opt_get_bool(opts, "cache.no-flush", true)) {
463 bdrv_flags |= BDRV_O_NO_FLUSH;
464 }
465
466 #ifdef CONFIG_LINUX_AIO
467 if ((buf = qemu_opt_get(opts, "aio")) != NULL) {
468 if (!strcmp(buf, "native")) {
469 bdrv_flags |= BDRV_O_NATIVE_AIO;
470 } else if (!strcmp(buf, "threads")) {
471 /* this is the default */
472 } else {
473 error_report("invalid aio option");
474 return NULL;
475 }
476 }
477 #endif
478
479 if ((buf = qemu_opt_get(opts, "format")) != NULL) {
480 if (is_help_option(buf)) {
481 error_printf("Supported formats:");
482 bdrv_iterate_format(bdrv_format_print, NULL);
483 error_printf("\n");
484 return NULL;
485 }
486
487 qdict_put(bs_opts, "driver", qstring_from_str(buf));
488 }
489
490 /* disk I/O throttling */
491 io_limits.bps[BLOCK_IO_LIMIT_TOTAL] =
492 qemu_opt_get_number(opts, "throttling.bps-total", 0);
493 io_limits.bps[BLOCK_IO_LIMIT_READ] =
494 qemu_opt_get_number(opts, "throttling.bps-read", 0);
495 io_limits.bps[BLOCK_IO_LIMIT_WRITE] =
496 qemu_opt_get_number(opts, "throttling.bps-write", 0);
497 io_limits.iops[BLOCK_IO_LIMIT_TOTAL] =
498 qemu_opt_get_number(opts, "throttling.iops-total", 0);
499 io_limits.iops[BLOCK_IO_LIMIT_READ] =
500 qemu_opt_get_number(opts, "throttling.iops-read", 0);
501 io_limits.iops[BLOCK_IO_LIMIT_WRITE] =
502 qemu_opt_get_number(opts, "throttling.iops-write", 0);
503
504 if (!do_check_io_limits(&io_limits, &error)) {
505 error_report("%s", error_get_pretty(error));
506 error_free(error);
507 return NULL;
508 }
509
510 if (qemu_opt_get(opts, "boot") != NULL) {
511 fprintf(stderr, "qemu-kvm: boot=on|off is deprecated and will be "
512 "ignored. Future versions will reject this parameter. Please "
513 "update your scripts.\n");
514 }
515
516 on_write_error = BLOCKDEV_ON_ERROR_ENOSPC;
517 if ((buf = qemu_opt_get(opts, "werror")) != NULL) {
518 if (type != IF_IDE && type != IF_SCSI && type != IF_VIRTIO && type != IF_NONE) {
519 error_report("werror is not supported by this bus type");
520 return NULL;
521 }
522
523 on_write_error = parse_block_error_action(buf, 0);
524 if (on_write_error < 0) {
525 return NULL;
526 }
527 }
528
529 on_read_error = BLOCKDEV_ON_ERROR_REPORT;
530 if ((buf = qemu_opt_get(opts, "rerror")) != NULL) {
531 if (type != IF_IDE && type != IF_VIRTIO && type != IF_SCSI && type != IF_NONE) {
532 error_report("rerror is not supported by this bus type");
533 return NULL;
534 }
535
536 on_read_error = parse_block_error_action(buf, 1);
537 if (on_read_error < 0) {
538 return NULL;
539 }
540 }
541
542 if ((devaddr = qemu_opt_get(opts, "addr")) != NULL) {
543 if (type != IF_VIRTIO) {
544 error_report("addr is not supported by this bus type");
545 return NULL;
546 }
547 }
548
549 /* compute bus and unit according index */
550
551 if (index != -1) {
552 if (bus_id != 0 || unit_id != -1) {
553 error_report("index cannot be used with bus and unit");
554 return NULL;
555 }
556 bus_id = drive_index_to_bus_id(type, index);
557 unit_id = drive_index_to_unit_id(type, index);
558 }
559
560 /* if user doesn't specify a unit_id,
561 * try to find the first free
562 */
563
564 if (unit_id == -1) {
565 unit_id = 0;
566 while (drive_get(type, bus_id, unit_id) != NULL) {
567 unit_id++;
568 if (max_devs && unit_id >= max_devs) {
569 unit_id -= max_devs;
570 bus_id++;
571 }
572 }
573 }
574
575 /* check unit id */
576
577 if (max_devs && unit_id >= max_devs) {
578 error_report("unit %d too big (max is %d)",
579 unit_id, max_devs - 1);
580 return NULL;
581 }
582
583 /*
584 * catch multiple definitions
585 */
586
587 if (drive_get(type, bus_id, unit_id) != NULL) {
588 error_report("drive with bus=%d, unit=%d (index=%d) exists",
589 bus_id, unit_id, index);
590 return NULL;
591 }
592
593 /* init */
594
595 dinfo = g_malloc0(sizeof(*dinfo));
596 if ((buf = qemu_opts_id(opts)) != NULL) {
597 dinfo->id = g_strdup(buf);
598 } else {
599 /* no id supplied -> create one */
600 dinfo->id = g_malloc0(32);
601 if (type == IF_IDE || type == IF_SCSI)
602 mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd";
603 if (max_devs)
604 snprintf(dinfo->id, 32, "%s%i%s%i",
605 if_name[type], bus_id, mediastr, unit_id);
606 else
607 snprintf(dinfo->id, 32, "%s%s%i",
608 if_name[type], mediastr, unit_id);
609 }
610 dinfo->bdrv = bdrv_new(dinfo->id);
611 dinfo->bdrv->open_flags = snapshot ? BDRV_O_SNAPSHOT : 0;
612 dinfo->bdrv->read_only = ro;
613 dinfo->devaddr = devaddr;
614 dinfo->type = type;
615 dinfo->bus = bus_id;
616 dinfo->unit = unit_id;
617 dinfo->cyls = cyls;
618 dinfo->heads = heads;
619 dinfo->secs = secs;
620 dinfo->trans = translation;
621 dinfo->opts = all_opts;
622 dinfo->refcount = 1;
623 if (serial != NULL) {
624 dinfo->serial = g_strdup(serial);
625 }
626 QTAILQ_INSERT_TAIL(&drives, dinfo, next);
627
628 bdrv_set_on_error(dinfo->bdrv, on_read_error, on_write_error);
629
630 /* disk I/O throttling */
631 bdrv_set_io_limits(dinfo->bdrv, &io_limits);
632
633 switch(type) {
634 case IF_IDE:
635 case IF_SCSI:
636 case IF_XEN:
637 case IF_NONE:
638 dinfo->media_cd = media == MEDIA_CDROM;
639 break;
640 case IF_SD:
641 case IF_FLOPPY:
642 case IF_PFLASH:
643 case IF_MTD:
644 break;
645 case IF_VIRTIO:
646 {
647 /* add virtio block device */
648 QemuOpts *devopts;
649 devopts = qemu_opts_create_nofail(qemu_find_opts("device"));
650 if (arch_type == QEMU_ARCH_S390X) {
651 qemu_opt_set(devopts, "driver", "virtio-blk-s390");
652 } else {
653 qemu_opt_set(devopts, "driver", "virtio-blk-pci");
654 }
655 qemu_opt_set(devopts, "drive", dinfo->id);
656 if (devaddr)
657 qemu_opt_set(devopts, "addr", devaddr);
658 break;
659 }
660 default:
661 abort();
662 }
663 if (!file || !*file) {
664 if (has_driver_specific_opts) {
665 file = NULL;
666 } else {
667 return dinfo;
668 }
669 }
670 if (snapshot) {
671 /* always use cache=unsafe with snapshot */
672 bdrv_flags &= ~BDRV_O_CACHE_MASK;
673 bdrv_flags |= (BDRV_O_SNAPSHOT|BDRV_O_CACHE_WB|BDRV_O_NO_FLUSH);
674 }
675
676 if (copy_on_read) {
677 bdrv_flags |= BDRV_O_COPY_ON_READ;
678 }
679
680 if (runstate_check(RUN_STATE_INMIGRATE)) {
681 bdrv_flags |= BDRV_O_INCOMING;
682 }
683
684 if (media == MEDIA_CDROM) {
685 /* CDROM is fine for any interface, don't check. */
686 ro = 1;
687 } else if (ro == 1) {
688 if (type != IF_SCSI && type != IF_VIRTIO && type != IF_FLOPPY &&
689 type != IF_NONE && type != IF_PFLASH) {
690 error_report("read-only not supported by this bus type");
691 goto err;
692 }
693 }
694
695 bdrv_flags |= ro ? 0 : BDRV_O_RDWR;
696
697 if (ro && copy_on_read) {
698 error_report("warning: disabling copy_on_read on read-only drive");
699 }
700
701 QINCREF(bs_opts);
702 ret = bdrv_open(dinfo->bdrv, file, bs_opts, bdrv_flags, NULL);
703
704 if (ret < 0) {
705 if (ret == -EMEDIUMTYPE) {
706 error_report("could not open disk image %s: not in %s format",
707 file ?: dinfo->id, qdict_get_str(bs_opts, "driver"));
708 } else {
709 error_report("could not open disk image %s: %s",
710 file ?: dinfo->id, strerror(-ret));
711 }
712 goto err;
713 }
714
715 if (bdrv_key_required(dinfo->bdrv))
716 autostart = 0;
717
718 QDECREF(bs_opts);
719 qemu_opts_del(opts);
720
721 return dinfo;
722
723 err:
724 qemu_opts_del(opts);
725 QDECREF(bs_opts);
726 bdrv_delete(dinfo->bdrv);
727 g_free(dinfo->id);
728 QTAILQ_REMOVE(&drives, dinfo, next);
729 g_free(dinfo);
730 return NULL;
731 }
732
733 static void qemu_opt_rename(QemuOpts *opts, const char *from, const char *to)
734 {
735 const char *value;
736
737 value = qemu_opt_get(opts, from);
738 if (value) {
739 qemu_opt_set(opts, to, value);
740 qemu_opt_unset(opts, from);
741 }
742 }
743
744 DriveInfo *drive_init(QemuOpts *all_opts, BlockInterfaceType block_default_type)
745 {
746 const char *value;
747
748 /* Change legacy command line options into QMP ones */
749 qemu_opt_rename(all_opts, "iops", "throttling.iops-total");
750 qemu_opt_rename(all_opts, "iops_rd", "throttling.iops-read");
751 qemu_opt_rename(all_opts, "iops_wr", "throttling.iops-write");
752
753 qemu_opt_rename(all_opts, "bps", "throttling.bps-total");
754 qemu_opt_rename(all_opts, "bps_rd", "throttling.bps-read");
755 qemu_opt_rename(all_opts, "bps_wr", "throttling.bps-write");
756
757 qemu_opt_rename(all_opts, "readonly", "read-only");
758
759 value = qemu_opt_get(all_opts, "cache");
760 if (value) {
761 int flags = 0;
762
763 if (bdrv_parse_cache_flags(value, &flags) != 0) {
764 error_report("invalid cache option");
765 return NULL;
766 }
767
768 /* Specific options take precedence */
769 if (!qemu_opt_get(all_opts, "cache.writeback")) {
770 qemu_opt_set_bool(all_opts, "cache.writeback",
771 !!(flags & BDRV_O_CACHE_WB));
772 }
773 if (!qemu_opt_get(all_opts, "cache.direct")) {
774 qemu_opt_set_bool(all_opts, "cache.direct",
775 !!(flags & BDRV_O_NOCACHE));
776 }
777 if (!qemu_opt_get(all_opts, "cache.no-flush")) {
778 qemu_opt_set_bool(all_opts, "cache.no-flush",
779 !!(flags & BDRV_O_NO_FLUSH));
780 }
781 qemu_opt_unset(all_opts, "cache");
782 }
783
784 return blockdev_init(all_opts, block_default_type);
785 }
786
787 void do_commit(Monitor *mon, const QDict *qdict)
788 {
789 const char *device = qdict_get_str(qdict, "device");
790 BlockDriverState *bs;
791 int ret;
792
793 if (!strcmp(device, "all")) {
794 ret = bdrv_commit_all();
795 } else {
796 bs = bdrv_find(device);
797 if (!bs) {
798 monitor_printf(mon, "Device '%s' not found\n", device);
799 return;
800 }
801 ret = bdrv_commit(bs);
802 }
803 if (ret < 0) {
804 monitor_printf(mon, "'commit' error for '%s': %s\n", device,
805 strerror(-ret));
806 }
807 }
808
809 static void blockdev_do_action(int kind, void *data, Error **errp)
810 {
811 TransactionAction action;
812 TransactionActionList list;
813
814 action.kind = kind;
815 action.data = data;
816 list.value = &action;
817 list.next = NULL;
818 qmp_transaction(&list, errp);
819 }
820
821 void qmp_blockdev_snapshot_sync(const char *device, const char *snapshot_file,
822 bool has_format, const char *format,
823 bool has_mode, enum NewImageMode mode,
824 Error **errp)
825 {
826 BlockdevSnapshot snapshot = {
827 .device = (char *) device,
828 .snapshot_file = (char *) snapshot_file,
829 .has_format = has_format,
830 .format = (char *) format,
831 .has_mode = has_mode,
832 .mode = mode,
833 };
834 blockdev_do_action(TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC,
835 &snapshot, errp);
836 }
837
838
839 /* New and old BlockDriverState structs for group snapshots */
840
841 typedef struct BlkTransactionState BlkTransactionState;
842
843 /* Only prepare() may fail. In a single transaction, only one of commit() or
844 abort() will be called, clean() will always be called if it present. */
845 typedef struct BdrvActionOps {
846 /* Size of state struct, in bytes. */
847 size_t instance_size;
848 /* Prepare the work, must NOT be NULL. */
849 void (*prepare)(BlkTransactionState *common, Error **errp);
850 /* Commit the changes, can be NULL. */
851 void (*commit)(BlkTransactionState *common);
852 /* Abort the changes on fail, can be NULL. */
853 void (*abort)(BlkTransactionState *common);
854 /* Clean up resource in the end, can be NULL. */
855 void (*clean)(BlkTransactionState *common);
856 } BdrvActionOps;
857
858 /*
859 * This structure must be arranged as first member in child type, assuming
860 * that compiler will also arrange it to the same address with parent instance.
861 * Later it will be used in free().
862 */
863 struct BlkTransactionState {
864 TransactionAction *action;
865 const BdrvActionOps *ops;
866 QSIMPLEQ_ENTRY(BlkTransactionState) entry;
867 };
868
869 /* external snapshot private data */
870 typedef struct ExternalSnapshotState {
871 BlkTransactionState common;
872 BlockDriverState *old_bs;
873 BlockDriverState *new_bs;
874 } ExternalSnapshotState;
875
876 static void external_snapshot_prepare(BlkTransactionState *common,
877 Error **errp)
878 {
879 BlockDriver *drv;
880 int flags, ret;
881 Error *local_err = NULL;
882 const char *device;
883 const char *new_image_file;
884 const char *format = "qcow2";
885 enum NewImageMode mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
886 ExternalSnapshotState *state =
887 DO_UPCAST(ExternalSnapshotState, common, common);
888 TransactionAction *action = common->action;
889
890 /* get parameters */
891 g_assert(action->kind == TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC);
892
893 device = action->blockdev_snapshot_sync->device;
894 new_image_file = action->blockdev_snapshot_sync->snapshot_file;
895 if (action->blockdev_snapshot_sync->has_format) {
896 format = action->blockdev_snapshot_sync->format;
897 }
898 if (action->blockdev_snapshot_sync->has_mode) {
899 mode = action->blockdev_snapshot_sync->mode;
900 }
901
902 /* start processing */
903 drv = bdrv_find_format(format);
904 if (!drv) {
905 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
906 return;
907 }
908
909 state->old_bs = bdrv_find(device);
910 if (!state->old_bs) {
911 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
912 return;
913 }
914
915 if (!bdrv_is_inserted(state->old_bs)) {
916 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
917 return;
918 }
919
920 if (bdrv_in_use(state->old_bs)) {
921 error_set(errp, QERR_DEVICE_IN_USE, device);
922 return;
923 }
924
925 if (!bdrv_is_read_only(state->old_bs)) {
926 if (bdrv_flush(state->old_bs)) {
927 error_set(errp, QERR_IO_ERROR);
928 return;
929 }
930 }
931
932 flags = state->old_bs->open_flags;
933
934 /* create new image w/backing file */
935 if (mode != NEW_IMAGE_MODE_EXISTING) {
936 bdrv_img_create(new_image_file, format,
937 state->old_bs->filename,
938 state->old_bs->drv->format_name,
939 NULL, -1, flags, &local_err, false);
940 if (error_is_set(&local_err)) {
941 error_propagate(errp, local_err);
942 return;
943 }
944 }
945
946 /* We will manually add the backing_hd field to the bs later */
947 state->new_bs = bdrv_new("");
948 /* TODO Inherit bs->options or only take explicit options with an
949 * extended QMP command? */
950 ret = bdrv_open(state->new_bs, new_image_file, NULL,
951 flags | BDRV_O_NO_BACKING, drv);
952 if (ret != 0) {
953 error_setg_file_open(errp, -ret, new_image_file);
954 }
955 }
956
957 static void external_snapshot_commit(BlkTransactionState *common)
958 {
959 ExternalSnapshotState *state =
960 DO_UPCAST(ExternalSnapshotState, common, common);
961
962 /* This removes our old bs and adds the new bs */
963 bdrv_append(state->new_bs, state->old_bs);
964 /* We don't need (or want) to use the transactional
965 * bdrv_reopen_multiple() across all the entries at once, because we
966 * don't want to abort all of them if one of them fails the reopen */
967 bdrv_reopen(state->new_bs, state->new_bs->open_flags & ~BDRV_O_RDWR,
968 NULL);
969 }
970
971 static void external_snapshot_abort(BlkTransactionState *common)
972 {
973 ExternalSnapshotState *state =
974 DO_UPCAST(ExternalSnapshotState, common, common);
975 if (state->new_bs) {
976 bdrv_delete(state->new_bs);
977 }
978 }
979
980 typedef struct DriveBackupState {
981 BlkTransactionState common;
982 BlockDriverState *bs;
983 BlockJob *job;
984 } DriveBackupState;
985
986 static void drive_backup_prepare(BlkTransactionState *common, Error **errp)
987 {
988 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
989 DriveBackup *backup;
990 Error *local_err = NULL;
991
992 assert(common->action->kind == TRANSACTION_ACTION_KIND_DRIVE_BACKUP);
993 backup = common->action->drive_backup;
994
995 qmp_drive_backup(backup->device, backup->target,
996 backup->has_format, backup->format,
997 backup->sync,
998 backup->has_mode, backup->mode,
999 backup->has_speed, backup->speed,
1000 backup->has_on_source_error, backup->on_source_error,
1001 backup->has_on_target_error, backup->on_target_error,
1002 &local_err);
1003 if (error_is_set(&local_err)) {
1004 error_propagate(errp, local_err);
1005 state->bs = NULL;
1006 state->job = NULL;
1007 return;
1008 }
1009
1010 state->bs = bdrv_find(backup->device);
1011 state->job = state->bs->job;
1012 }
1013
1014 static void drive_backup_abort(BlkTransactionState *common)
1015 {
1016 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1017 BlockDriverState *bs = state->bs;
1018
1019 /* Only cancel if it's the job we started */
1020 if (bs && bs->job && bs->job == state->job) {
1021 block_job_cancel_sync(bs->job);
1022 }
1023 }
1024
1025 static void abort_prepare(BlkTransactionState *common, Error **errp)
1026 {
1027 error_setg(errp, "Transaction aborted using Abort action");
1028 }
1029
1030 static void abort_commit(BlkTransactionState *common)
1031 {
1032 g_assert_not_reached(); /* this action never succeeds */
1033 }
1034
1035 static const BdrvActionOps actions[] = {
1036 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC] = {
1037 .instance_size = sizeof(ExternalSnapshotState),
1038 .prepare = external_snapshot_prepare,
1039 .commit = external_snapshot_commit,
1040 .abort = external_snapshot_abort,
1041 },
1042 [TRANSACTION_ACTION_KIND_DRIVE_BACKUP] = {
1043 .instance_size = sizeof(DriveBackupState),
1044 .prepare = drive_backup_prepare,
1045 .abort = drive_backup_abort,
1046 },
1047 [TRANSACTION_ACTION_KIND_ABORT] = {
1048 .instance_size = sizeof(BlkTransactionState),
1049 .prepare = abort_prepare,
1050 .commit = abort_commit,
1051 },
1052 };
1053
1054 /*
1055 * 'Atomic' group snapshots. The snapshots are taken as a set, and if any fail
1056 * then we do not pivot any of the devices in the group, and abandon the
1057 * snapshots
1058 */
1059 void qmp_transaction(TransactionActionList *dev_list, Error **errp)
1060 {
1061 TransactionActionList *dev_entry = dev_list;
1062 BlkTransactionState *state, *next;
1063 Error *local_err = NULL;
1064
1065 QSIMPLEQ_HEAD(snap_bdrv_states, BlkTransactionState) snap_bdrv_states;
1066 QSIMPLEQ_INIT(&snap_bdrv_states);
1067
1068 /* drain all i/o before any snapshots */
1069 bdrv_drain_all();
1070
1071 /* We don't do anything in this loop that commits us to the snapshot */
1072 while (NULL != dev_entry) {
1073 TransactionAction *dev_info = NULL;
1074 const BdrvActionOps *ops;
1075
1076 dev_info = dev_entry->value;
1077 dev_entry = dev_entry->next;
1078
1079 assert(dev_info->kind < ARRAY_SIZE(actions));
1080
1081 ops = &actions[dev_info->kind];
1082 state = g_malloc0(ops->instance_size);
1083 state->ops = ops;
1084 state->action = dev_info;
1085 QSIMPLEQ_INSERT_TAIL(&snap_bdrv_states, state, entry);
1086
1087 state->ops->prepare(state, &local_err);
1088 if (error_is_set(&local_err)) {
1089 error_propagate(errp, local_err);
1090 goto delete_and_fail;
1091 }
1092 }
1093
1094 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) {
1095 if (state->ops->commit) {
1096 state->ops->commit(state);
1097 }
1098 }
1099
1100 /* success */
1101 goto exit;
1102
1103 delete_and_fail:
1104 /*
1105 * failure, and it is all-or-none; abandon each new bs, and keep using
1106 * the original bs for all images
1107 */
1108 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) {
1109 if (state->ops->abort) {
1110 state->ops->abort(state);
1111 }
1112 }
1113 exit:
1114 QSIMPLEQ_FOREACH_SAFE(state, &snap_bdrv_states, entry, next) {
1115 if (state->ops->clean) {
1116 state->ops->clean(state);
1117 }
1118 g_free(state);
1119 }
1120 }
1121
1122
1123 static void eject_device(BlockDriverState *bs, int force, Error **errp)
1124 {
1125 if (bdrv_in_use(bs)) {
1126 error_set(errp, QERR_DEVICE_IN_USE, bdrv_get_device_name(bs));
1127 return;
1128 }
1129 if (!bdrv_dev_has_removable_media(bs)) {
1130 error_set(errp, QERR_DEVICE_NOT_REMOVABLE, bdrv_get_device_name(bs));
1131 return;
1132 }
1133
1134 if (bdrv_dev_is_medium_locked(bs) && !bdrv_dev_is_tray_open(bs)) {
1135 bdrv_dev_eject_request(bs, force);
1136 if (!force) {
1137 error_set(errp, QERR_DEVICE_LOCKED, bdrv_get_device_name(bs));
1138 return;
1139 }
1140 }
1141
1142 bdrv_close(bs);
1143 }
1144
1145 void qmp_eject(const char *device, bool has_force, bool force, Error **errp)
1146 {
1147 BlockDriverState *bs;
1148
1149 bs = bdrv_find(device);
1150 if (!bs) {
1151 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1152 return;
1153 }
1154
1155 eject_device(bs, force, errp);
1156 }
1157
1158 void qmp_block_passwd(const char *device, const char *password, Error **errp)
1159 {
1160 BlockDriverState *bs;
1161 int err;
1162
1163 bs = bdrv_find(device);
1164 if (!bs) {
1165 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1166 return;
1167 }
1168
1169 err = bdrv_set_key(bs, password);
1170 if (err == -EINVAL) {
1171 error_set(errp, QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs));
1172 return;
1173 } else if (err < 0) {
1174 error_set(errp, QERR_INVALID_PASSWORD);
1175 return;
1176 }
1177 }
1178
1179 static void qmp_bdrv_open_encrypted(BlockDriverState *bs, const char *filename,
1180 int bdrv_flags, BlockDriver *drv,
1181 const char *password, Error **errp)
1182 {
1183 int ret;
1184
1185 ret = bdrv_open(bs, filename, NULL, bdrv_flags, drv);
1186 if (ret < 0) {
1187 error_setg_file_open(errp, -ret, filename);
1188 return;
1189 }
1190
1191 if (bdrv_key_required(bs)) {
1192 if (password) {
1193 if (bdrv_set_key(bs, password) < 0) {
1194 error_set(errp, QERR_INVALID_PASSWORD);
1195 }
1196 } else {
1197 error_set(errp, QERR_DEVICE_ENCRYPTED, bdrv_get_device_name(bs),
1198 bdrv_get_encrypted_filename(bs));
1199 }
1200 } else if (password) {
1201 error_set(errp, QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs));
1202 }
1203 }
1204
1205 void qmp_change_blockdev(const char *device, const char *filename,
1206 bool has_format, const char *format, Error **errp)
1207 {
1208 BlockDriverState *bs;
1209 BlockDriver *drv = NULL;
1210 int bdrv_flags;
1211 Error *err = NULL;
1212
1213 bs = bdrv_find(device);
1214 if (!bs) {
1215 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1216 return;
1217 }
1218
1219 if (format) {
1220 drv = bdrv_find_whitelisted_format(format, bs->read_only);
1221 if (!drv) {
1222 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
1223 return;
1224 }
1225 }
1226
1227 eject_device(bs, 0, &err);
1228 if (error_is_set(&err)) {
1229 error_propagate(errp, err);
1230 return;
1231 }
1232
1233 bdrv_flags = bdrv_is_read_only(bs) ? 0 : BDRV_O_RDWR;
1234 bdrv_flags |= bdrv_is_snapshot(bs) ? BDRV_O_SNAPSHOT : 0;
1235
1236 qmp_bdrv_open_encrypted(bs, filename, bdrv_flags, drv, NULL, errp);
1237 }
1238
1239 /* throttling disk I/O limits */
1240 void qmp_block_set_io_throttle(const char *device, int64_t bps, int64_t bps_rd,
1241 int64_t bps_wr, int64_t iops, int64_t iops_rd,
1242 int64_t iops_wr, Error **errp)
1243 {
1244 BlockIOLimit io_limits;
1245 BlockDriverState *bs;
1246
1247 bs = bdrv_find(device);
1248 if (!bs) {
1249 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1250 return;
1251 }
1252
1253 io_limits.bps[BLOCK_IO_LIMIT_TOTAL] = bps;
1254 io_limits.bps[BLOCK_IO_LIMIT_READ] = bps_rd;
1255 io_limits.bps[BLOCK_IO_LIMIT_WRITE] = bps_wr;
1256 io_limits.iops[BLOCK_IO_LIMIT_TOTAL]= iops;
1257 io_limits.iops[BLOCK_IO_LIMIT_READ] = iops_rd;
1258 io_limits.iops[BLOCK_IO_LIMIT_WRITE]= iops_wr;
1259
1260 if (!do_check_io_limits(&io_limits, errp)) {
1261 return;
1262 }
1263
1264 bs->io_limits = io_limits;
1265
1266 if (!bs->io_limits_enabled && bdrv_io_limits_enabled(bs)) {
1267 bdrv_io_limits_enable(bs);
1268 } else if (bs->io_limits_enabled && !bdrv_io_limits_enabled(bs)) {
1269 bdrv_io_limits_disable(bs);
1270 } else {
1271 if (bs->block_timer) {
1272 qemu_mod_timer(bs->block_timer, qemu_get_clock_ns(vm_clock));
1273 }
1274 }
1275 }
1276
1277 int do_drive_del(Monitor *mon, const QDict *qdict, QObject **ret_data)
1278 {
1279 const char *id = qdict_get_str(qdict, "id");
1280 BlockDriverState *bs;
1281
1282 bs = bdrv_find(id);
1283 if (!bs) {
1284 qerror_report(QERR_DEVICE_NOT_FOUND, id);
1285 return -1;
1286 }
1287 if (bdrv_in_use(bs)) {
1288 qerror_report(QERR_DEVICE_IN_USE, id);
1289 return -1;
1290 }
1291
1292 /* quiesce block driver; prevent further io */
1293 bdrv_drain_all();
1294 bdrv_flush(bs);
1295 bdrv_close(bs);
1296
1297 /* if we have a device attached to this BlockDriverState
1298 * then we need to make the drive anonymous until the device
1299 * can be removed. If this is a drive with no device backing
1300 * then we can just get rid of the block driver state right here.
1301 */
1302 if (bdrv_get_attached_dev(bs)) {
1303 bdrv_make_anon(bs);
1304
1305 /* Further I/O must not pause the guest */
1306 bdrv_set_on_error(bs, BLOCKDEV_ON_ERROR_REPORT,
1307 BLOCKDEV_ON_ERROR_REPORT);
1308 } else {
1309 drive_uninit(drive_get_by_blockdev(bs));
1310 }
1311
1312 return 0;
1313 }
1314
1315 void qmp_block_resize(const char *device, int64_t size, Error **errp)
1316 {
1317 BlockDriverState *bs;
1318 int ret;
1319
1320 bs = bdrv_find(device);
1321 if (!bs) {
1322 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1323 return;
1324 }
1325
1326 if (size < 0) {
1327 error_set(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size");
1328 return;
1329 }
1330
1331 /* complete all in-flight operations before resizing the device */
1332 bdrv_drain_all();
1333
1334 ret = bdrv_truncate(bs, size);
1335 switch (ret) {
1336 case 0:
1337 break;
1338 case -ENOMEDIUM:
1339 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1340 break;
1341 case -ENOTSUP:
1342 error_set(errp, QERR_UNSUPPORTED);
1343 break;
1344 case -EACCES:
1345 error_set(errp, QERR_DEVICE_IS_READ_ONLY, device);
1346 break;
1347 case -EBUSY:
1348 error_set(errp, QERR_DEVICE_IN_USE, device);
1349 break;
1350 default:
1351 error_setg_errno(errp, -ret, "Could not resize");
1352 break;
1353 }
1354 }
1355
1356 static void block_job_cb(void *opaque, int ret)
1357 {
1358 BlockDriverState *bs = opaque;
1359 QObject *obj;
1360
1361 trace_block_job_cb(bs, bs->job, ret);
1362
1363 assert(bs->job);
1364 obj = qobject_from_block_job(bs->job);
1365 if (ret < 0) {
1366 QDict *dict = qobject_to_qdict(obj);
1367 qdict_put(dict, "error", qstring_from_str(strerror(-ret)));
1368 }
1369
1370 if (block_job_is_cancelled(bs->job)) {
1371 monitor_protocol_event(QEVENT_BLOCK_JOB_CANCELLED, obj);
1372 } else {
1373 monitor_protocol_event(QEVENT_BLOCK_JOB_COMPLETED, obj);
1374 }
1375 qobject_decref(obj);
1376
1377 drive_put_ref_bh_schedule(drive_get_by_blockdev(bs));
1378 }
1379
1380 void qmp_block_stream(const char *device, bool has_base,
1381 const char *base, bool has_speed, int64_t speed,
1382 bool has_on_error, BlockdevOnError on_error,
1383 Error **errp)
1384 {
1385 BlockDriverState *bs;
1386 BlockDriverState *base_bs = NULL;
1387 Error *local_err = NULL;
1388
1389 if (!has_on_error) {
1390 on_error = BLOCKDEV_ON_ERROR_REPORT;
1391 }
1392
1393 bs = bdrv_find(device);
1394 if (!bs) {
1395 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1396 return;
1397 }
1398
1399 if (base) {
1400 base_bs = bdrv_find_backing_image(bs, base);
1401 if (base_bs == NULL) {
1402 error_set(errp, QERR_BASE_NOT_FOUND, base);
1403 return;
1404 }
1405 }
1406
1407 stream_start(bs, base_bs, base, has_speed ? speed : 0,
1408 on_error, block_job_cb, bs, &local_err);
1409 if (error_is_set(&local_err)) {
1410 error_propagate(errp, local_err);
1411 return;
1412 }
1413
1414 /* Grab a reference so hotplug does not delete the BlockDriverState from
1415 * underneath us.
1416 */
1417 drive_get_ref(drive_get_by_blockdev(bs));
1418
1419 trace_qmp_block_stream(bs, bs->job);
1420 }
1421
1422 void qmp_block_commit(const char *device,
1423 bool has_base, const char *base, const char *top,
1424 bool has_speed, int64_t speed,
1425 Error **errp)
1426 {
1427 BlockDriverState *bs;
1428 BlockDriverState *base_bs, *top_bs;
1429 Error *local_err = NULL;
1430 /* This will be part of the QMP command, if/when the
1431 * BlockdevOnError change for blkmirror makes it in
1432 */
1433 BlockdevOnError on_error = BLOCKDEV_ON_ERROR_REPORT;
1434
1435 /* drain all i/o before commits */
1436 bdrv_drain_all();
1437
1438 bs = bdrv_find(device);
1439 if (!bs) {
1440 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1441 return;
1442 }
1443
1444 /* default top_bs is the active layer */
1445 top_bs = bs;
1446
1447 if (top) {
1448 if (strcmp(bs->filename, top) != 0) {
1449 top_bs = bdrv_find_backing_image(bs, top);
1450 }
1451 }
1452
1453 if (top_bs == NULL) {
1454 error_setg(errp, "Top image file %s not found", top ? top : "NULL");
1455 return;
1456 }
1457
1458 if (has_base && base) {
1459 base_bs = bdrv_find_backing_image(top_bs, base);
1460 } else {
1461 base_bs = bdrv_find_base(top_bs);
1462 }
1463
1464 if (base_bs == NULL) {
1465 error_set(errp, QERR_BASE_NOT_FOUND, base ? base : "NULL");
1466 return;
1467 }
1468
1469 commit_start(bs, base_bs, top_bs, speed, on_error, block_job_cb, bs,
1470 &local_err);
1471 if (local_err != NULL) {
1472 error_propagate(errp, local_err);
1473 return;
1474 }
1475 /* Grab a reference so hotplug does not delete the BlockDriverState from
1476 * underneath us.
1477 */
1478 drive_get_ref(drive_get_by_blockdev(bs));
1479 }
1480
1481 void qmp_drive_backup(const char *device, const char *target,
1482 bool has_format, const char *format,
1483 enum MirrorSyncMode sync,
1484 bool has_mode, enum NewImageMode mode,
1485 bool has_speed, int64_t speed,
1486 bool has_on_source_error, BlockdevOnError on_source_error,
1487 bool has_on_target_error, BlockdevOnError on_target_error,
1488 Error **errp)
1489 {
1490 BlockDriverState *bs;
1491 BlockDriverState *target_bs;
1492 BlockDriverState *source = NULL;
1493 BlockDriver *drv = NULL;
1494 Error *local_err = NULL;
1495 int flags;
1496 int64_t size;
1497 int ret;
1498
1499 if (!has_speed) {
1500 speed = 0;
1501 }
1502 if (!has_on_source_error) {
1503 on_source_error = BLOCKDEV_ON_ERROR_REPORT;
1504 }
1505 if (!has_on_target_error) {
1506 on_target_error = BLOCKDEV_ON_ERROR_REPORT;
1507 }
1508 if (!has_mode) {
1509 mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
1510 }
1511
1512 bs = bdrv_find(device);
1513 if (!bs) {
1514 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1515 return;
1516 }
1517
1518 if (!bdrv_is_inserted(bs)) {
1519 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1520 return;
1521 }
1522
1523 if (!has_format) {
1524 format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name;
1525 }
1526 if (format) {
1527 drv = bdrv_find_format(format);
1528 if (!drv) {
1529 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
1530 return;
1531 }
1532 }
1533
1534 if (bdrv_in_use(bs)) {
1535 error_set(errp, QERR_DEVICE_IN_USE, device);
1536 return;
1537 }
1538
1539 flags = bs->open_flags | BDRV_O_RDWR;
1540
1541 /* See if we have a backing HD we can use to create our new image
1542 * on top of. */
1543 if (sync == MIRROR_SYNC_MODE_TOP) {
1544 source = bs->backing_hd;
1545 if (!source) {
1546 sync = MIRROR_SYNC_MODE_FULL;
1547 }
1548 }
1549 if (sync == MIRROR_SYNC_MODE_NONE) {
1550 source = bs;
1551 }
1552
1553 size = bdrv_getlength(bs);
1554 if (size < 0) {
1555 error_setg_errno(errp, -size, "bdrv_getlength failed");
1556 return;
1557 }
1558
1559 if (mode != NEW_IMAGE_MODE_EXISTING) {
1560 assert(format && drv);
1561 if (source) {
1562 bdrv_img_create(target, format, source->filename,
1563 source->drv->format_name, NULL,
1564 size, flags, &local_err, false);
1565 } else {
1566 bdrv_img_create(target, format, NULL, NULL, NULL,
1567 size, flags, &local_err, false);
1568 }
1569 }
1570
1571 if (error_is_set(&local_err)) {
1572 error_propagate(errp, local_err);
1573 return;
1574 }
1575
1576 target_bs = bdrv_new("");
1577 ret = bdrv_open(target_bs, target, NULL, flags, drv);
1578 if (ret < 0) {
1579 bdrv_delete(target_bs);
1580 error_setg_file_open(errp, -ret, target);
1581 return;
1582 }
1583
1584 backup_start(bs, target_bs, speed, sync, on_source_error, on_target_error,
1585 block_job_cb, bs, &local_err);
1586 if (local_err != NULL) {
1587 bdrv_delete(target_bs);
1588 error_propagate(errp, local_err);
1589 return;
1590 }
1591
1592 /* Grab a reference so hotplug does not delete the BlockDriverState from
1593 * underneath us.
1594 */
1595 drive_get_ref(drive_get_by_blockdev(bs));
1596 }
1597
1598 #define DEFAULT_MIRROR_BUF_SIZE (10 << 20)
1599
1600 void qmp_drive_mirror(const char *device, const char *target,
1601 bool has_format, const char *format,
1602 enum MirrorSyncMode sync,
1603 bool has_mode, enum NewImageMode mode,
1604 bool has_speed, int64_t speed,
1605 bool has_granularity, uint32_t granularity,
1606 bool has_buf_size, int64_t buf_size,
1607 bool has_on_source_error, BlockdevOnError on_source_error,
1608 bool has_on_target_error, BlockdevOnError on_target_error,
1609 Error **errp)
1610 {
1611 BlockDriverState *bs;
1612 BlockDriverState *source, *target_bs;
1613 BlockDriver *drv = NULL;
1614 Error *local_err = NULL;
1615 int flags;
1616 int64_t size;
1617 int ret;
1618
1619 if (!has_speed) {
1620 speed = 0;
1621 }
1622 if (!has_on_source_error) {
1623 on_source_error = BLOCKDEV_ON_ERROR_REPORT;
1624 }
1625 if (!has_on_target_error) {
1626 on_target_error = BLOCKDEV_ON_ERROR_REPORT;
1627 }
1628 if (!has_mode) {
1629 mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
1630 }
1631 if (!has_granularity) {
1632 granularity = 0;
1633 }
1634 if (!has_buf_size) {
1635 buf_size = DEFAULT_MIRROR_BUF_SIZE;
1636 }
1637
1638 if (granularity != 0 && (granularity < 512 || granularity > 1048576 * 64)) {
1639 error_set(errp, QERR_INVALID_PARAMETER, device);
1640 return;
1641 }
1642 if (granularity & (granularity - 1)) {
1643 error_set(errp, QERR_INVALID_PARAMETER, device);
1644 return;
1645 }
1646
1647 bs = bdrv_find(device);
1648 if (!bs) {
1649 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1650 return;
1651 }
1652
1653 if (!bdrv_is_inserted(bs)) {
1654 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1655 return;
1656 }
1657
1658 if (!has_format) {
1659 format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name;
1660 }
1661 if (format) {
1662 drv = bdrv_find_format(format);
1663 if (!drv) {
1664 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
1665 return;
1666 }
1667 }
1668
1669 if (bdrv_in_use(bs)) {
1670 error_set(errp, QERR_DEVICE_IN_USE, device);
1671 return;
1672 }
1673
1674 flags = bs->open_flags | BDRV_O_RDWR;
1675 source = bs->backing_hd;
1676 if (!source && sync == MIRROR_SYNC_MODE_TOP) {
1677 sync = MIRROR_SYNC_MODE_FULL;
1678 }
1679
1680 size = bdrv_getlength(bs);
1681 if (size < 0) {
1682 error_setg_errno(errp, -size, "bdrv_getlength failed");
1683 return;
1684 }
1685
1686 if (sync == MIRROR_SYNC_MODE_FULL && mode != NEW_IMAGE_MODE_EXISTING) {
1687 /* create new image w/o backing file */
1688 assert(format && drv);
1689 bdrv_img_create(target, format,
1690 NULL, NULL, NULL, size, flags, &local_err, false);
1691 } else {
1692 switch (mode) {
1693 case NEW_IMAGE_MODE_EXISTING:
1694 ret = 0;
1695 break;
1696 case NEW_IMAGE_MODE_ABSOLUTE_PATHS:
1697 /* create new image with backing file */
1698 bdrv_img_create(target, format,
1699 source->filename,
1700 source->drv->format_name,
1701 NULL, size, flags, &local_err, false);
1702 break;
1703 default:
1704 abort();
1705 }
1706 }
1707
1708 if (error_is_set(&local_err)) {
1709 error_propagate(errp, local_err);
1710 return;
1711 }
1712
1713 /* Mirroring takes care of copy-on-write using the source's backing
1714 * file.
1715 */
1716 target_bs = bdrv_new("");
1717 ret = bdrv_open(target_bs, target, NULL, flags | BDRV_O_NO_BACKING, drv);
1718 if (ret < 0) {
1719 bdrv_delete(target_bs);
1720 error_setg_file_open(errp, -ret, target);
1721 return;
1722 }
1723
1724 mirror_start(bs, target_bs, speed, granularity, buf_size, sync,
1725 on_source_error, on_target_error,
1726 block_job_cb, bs, &local_err);
1727 if (local_err != NULL) {
1728 bdrv_delete(target_bs);
1729 error_propagate(errp, local_err);
1730 return;
1731 }
1732
1733 /* Grab a reference so hotplug does not delete the BlockDriverState from
1734 * underneath us.
1735 */
1736 drive_get_ref(drive_get_by_blockdev(bs));
1737 }
1738
1739 static BlockJob *find_block_job(const char *device)
1740 {
1741 BlockDriverState *bs;
1742
1743 bs = bdrv_find(device);
1744 if (!bs || !bs->job) {
1745 return NULL;
1746 }
1747 return bs->job;
1748 }
1749
1750 void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp)
1751 {
1752 BlockJob *job = find_block_job(device);
1753
1754 if (!job) {
1755 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
1756 return;
1757 }
1758
1759 block_job_set_speed(job, speed, errp);
1760 }
1761
1762 void qmp_block_job_cancel(const char *device,
1763 bool has_force, bool force, Error **errp)
1764 {
1765 BlockJob *job = find_block_job(device);
1766
1767 if (!has_force) {
1768 force = false;
1769 }
1770
1771 if (!job) {
1772 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
1773 return;
1774 }
1775 if (job->paused && !force) {
1776 error_set(errp, QERR_BLOCK_JOB_PAUSED, device);
1777 return;
1778 }
1779
1780 trace_qmp_block_job_cancel(job);
1781 block_job_cancel(job);
1782 }
1783
1784 void qmp_block_job_pause(const char *device, Error **errp)
1785 {
1786 BlockJob *job = find_block_job(device);
1787
1788 if (!job) {
1789 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
1790 return;
1791 }
1792
1793 trace_qmp_block_job_pause(job);
1794 block_job_pause(job);
1795 }
1796
1797 void qmp_block_job_resume(const char *device, Error **errp)
1798 {
1799 BlockJob *job = find_block_job(device);
1800
1801 if (!job) {
1802 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
1803 return;
1804 }
1805
1806 trace_qmp_block_job_resume(job);
1807 block_job_resume(job);
1808 }
1809
1810 void qmp_block_job_complete(const char *device, Error **errp)
1811 {
1812 BlockJob *job = find_block_job(device);
1813
1814 if (!job) {
1815 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
1816 return;
1817 }
1818
1819 trace_qmp_block_job_complete(job);
1820 block_job_complete(job, errp);
1821 }
1822
1823 static void do_qmp_query_block_jobs_one(void *opaque, BlockDriverState *bs)
1824 {
1825 BlockJobInfoList **prev = opaque;
1826 BlockJob *job = bs->job;
1827
1828 if (job) {
1829 BlockJobInfoList *elem = g_new0(BlockJobInfoList, 1);
1830 elem->value = block_job_query(bs->job);
1831 (*prev)->next = elem;
1832 *prev = elem;
1833 }
1834 }
1835
1836 BlockJobInfoList *qmp_query_block_jobs(Error **errp)
1837 {
1838 /* Dummy is a fake list element for holding the head pointer */
1839 BlockJobInfoList dummy = {};
1840 BlockJobInfoList *prev = &dummy;
1841 bdrv_iterate(do_qmp_query_block_jobs_one, &prev);
1842 return dummy.next;
1843 }
1844
1845 QemuOptsList qemu_common_drive_opts = {
1846 .name = "drive",
1847 .head = QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts.head),
1848 .desc = {
1849 {
1850 .name = "bus",
1851 .type = QEMU_OPT_NUMBER,
1852 .help = "bus number",
1853 },{
1854 .name = "unit",
1855 .type = QEMU_OPT_NUMBER,
1856 .help = "unit number (i.e. lun for scsi)",
1857 },{
1858 .name = "if",
1859 .type = QEMU_OPT_STRING,
1860 .help = "interface (ide, scsi, sd, mtd, floppy, pflash, virtio)",
1861 },{
1862 .name = "index",
1863 .type = QEMU_OPT_NUMBER,
1864 .help = "index number",
1865 },{
1866 .name = "cyls",
1867 .type = QEMU_OPT_NUMBER,
1868 .help = "number of cylinders (ide disk geometry)",
1869 },{
1870 .name = "heads",
1871 .type = QEMU_OPT_NUMBER,
1872 .help = "number of heads (ide disk geometry)",
1873 },{
1874 .name = "secs",
1875 .type = QEMU_OPT_NUMBER,
1876 .help = "number of sectors (ide disk geometry)",
1877 },{
1878 .name = "trans",
1879 .type = QEMU_OPT_STRING,
1880 .help = "chs translation (auto, lba. none)",
1881 },{
1882 .name = "media",
1883 .type = QEMU_OPT_STRING,
1884 .help = "media type (disk, cdrom)",
1885 },{
1886 .name = "snapshot",
1887 .type = QEMU_OPT_BOOL,
1888 .help = "enable/disable snapshot mode",
1889 },{
1890 .name = "file",
1891 .type = QEMU_OPT_STRING,
1892 .help = "disk image",
1893 },{
1894 .name = "discard",
1895 .type = QEMU_OPT_STRING,
1896 .help = "discard operation (ignore/off, unmap/on)",
1897 },{
1898 .name = "cache.writeback",
1899 .type = QEMU_OPT_BOOL,
1900 .help = "enables writeback mode for any caches",
1901 },{
1902 .name = "cache.direct",
1903 .type = QEMU_OPT_BOOL,
1904 .help = "enables use of O_DIRECT (bypass the host page cache)",
1905 },{
1906 .name = "cache.no-flush",
1907 .type = QEMU_OPT_BOOL,
1908 .help = "ignore any flush requests for the device",
1909 },{
1910 .name = "aio",
1911 .type = QEMU_OPT_STRING,
1912 .help = "host AIO implementation (threads, native)",
1913 },{
1914 .name = "format",
1915 .type = QEMU_OPT_STRING,
1916 .help = "disk format (raw, qcow2, ...)",
1917 },{
1918 .name = "serial",
1919 .type = QEMU_OPT_STRING,
1920 .help = "disk serial number",
1921 },{
1922 .name = "rerror",
1923 .type = QEMU_OPT_STRING,
1924 .help = "read error action",
1925 },{
1926 .name = "werror",
1927 .type = QEMU_OPT_STRING,
1928 .help = "write error action",
1929 },{
1930 .name = "addr",
1931 .type = QEMU_OPT_STRING,
1932 .help = "pci address (virtio only)",
1933 },{
1934 .name = "read-only",
1935 .type = QEMU_OPT_BOOL,
1936 .help = "open drive file as read-only",
1937 },{
1938 .name = "throttling.iops-total",
1939 .type = QEMU_OPT_NUMBER,
1940 .help = "limit total I/O operations per second",
1941 },{
1942 .name = "throttling.iops-read",
1943 .type = QEMU_OPT_NUMBER,
1944 .help = "limit read operations per second",
1945 },{
1946 .name = "throttling.iops-write",
1947 .type = QEMU_OPT_NUMBER,
1948 .help = "limit write operations per second",
1949 },{
1950 .name = "throttling.bps-total",
1951 .type = QEMU_OPT_NUMBER,
1952 .help = "limit total bytes per second",
1953 },{
1954 .name = "throttling.bps-read",
1955 .type = QEMU_OPT_NUMBER,
1956 .help = "limit read bytes per second",
1957 },{
1958 .name = "throttling.bps-write",
1959 .type = QEMU_OPT_NUMBER,
1960 .help = "limit write bytes per second",
1961 },{
1962 .name = "copy-on-read",
1963 .type = QEMU_OPT_BOOL,
1964 .help = "copy read data from backing file into image file",
1965 },{
1966 .name = "boot",
1967 .type = QEMU_OPT_BOOL,
1968 .help = "(deprecated, ignored)",
1969 },
1970 { /* end of list */ }
1971 },
1972 };
1973
1974 QemuOptsList qemu_drive_opts = {
1975 .name = "drive",
1976 .head = QTAILQ_HEAD_INITIALIZER(qemu_drive_opts.head),
1977 .desc = {
1978 /*
1979 * no elements => accept any params
1980 * validation will happen later
1981 */
1982 { /* end of list */ }
1983 },
1984 };
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