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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 | ||
10 | #include "blockdev.h" | |
11 | #include "hw/block-common.h" | |
12 | #include "monitor.h" | |
13 | #include "qerror.h" | |
14 | #include "qemu-option.h" | |
15 | #include "qemu-config.h" | |
16 | #include "qemu-objects.h" | |
17 | #include "sysemu.h" | |
18 | #include "block_int.h" | |
19 | #include "qmp-commands.h" | |
20 | #include "trace.h" | |
21 | #include "arch_init.h" | |
22 | ||
23 | static QTAILQ_HEAD(drivelist, DriveInfo) drives = QTAILQ_HEAD_INITIALIZER(drives); | |
24 | ||
25 | static const char *const if_name[IF_COUNT] = { | |
26 | [IF_NONE] = "none", | |
27 | [IF_IDE] = "ide", | |
28 | [IF_SCSI] = "scsi", | |
29 | [IF_FLOPPY] = "floppy", | |
30 | [IF_PFLASH] = "pflash", | |
31 | [IF_MTD] = "mtd", | |
32 | [IF_SD] = "sd", | |
33 | [IF_VIRTIO] = "virtio", | |
34 | [IF_XEN] = "xen", | |
35 | }; | |
36 | ||
37 | static const int if_max_devs[IF_COUNT] = { | |
38 | /* | |
39 | * Do not change these numbers! They govern how drive option | |
40 | * index maps to unit and bus. That mapping is ABI. | |
41 | * | |
42 | * All controllers used to imlement if=T drives need to support | |
43 | * if_max_devs[T] units, for any T with if_max_devs[T] != 0. | |
44 | * Otherwise, some index values map to "impossible" bus, unit | |
45 | * values. | |
46 | * | |
47 | * For instance, if you change [IF_SCSI] to 255, -drive | |
48 | * if=scsi,index=12 no longer means bus=1,unit=5, but | |
49 | * bus=0,unit=12. With an lsi53c895a controller (7 units max), | |
50 | * the drive can't be set up. Regression. | |
51 | */ | |
52 | [IF_IDE] = 2, | |
53 | [IF_SCSI] = 7, | |
54 | }; | |
55 | ||
56 | /* | |
57 | * We automatically delete the drive when a device using it gets | |
58 | * unplugged. Questionable feature, but we can't just drop it. | |
59 | * Device models call blockdev_mark_auto_del() to schedule the | |
60 | * automatic deletion, and generic qdev code calls blockdev_auto_del() | |
61 | * when deletion is actually safe. | |
62 | */ | |
63 | void blockdev_mark_auto_del(BlockDriverState *bs) | |
64 | { | |
65 | DriveInfo *dinfo = drive_get_by_blockdev(bs); | |
66 | ||
67 | if (bs->job) { | |
68 | block_job_cancel(bs->job); | |
69 | } | |
70 | if (dinfo) { | |
71 | dinfo->auto_del = 1; | |
72 | } | |
73 | } | |
74 | ||
75 | void blockdev_auto_del(BlockDriverState *bs) | |
76 | { | |
77 | DriveInfo *dinfo = drive_get_by_blockdev(bs); | |
78 | ||
79 | if (dinfo && dinfo->auto_del) { | |
80 | drive_put_ref(dinfo); | |
81 | } | |
82 | } | |
83 | ||
84 | static int drive_index_to_bus_id(BlockInterfaceType type, int index) | |
85 | { | |
86 | int max_devs = if_max_devs[type]; | |
87 | return max_devs ? index / max_devs : 0; | |
88 | } | |
89 | ||
90 | static int drive_index_to_unit_id(BlockInterfaceType type, int index) | |
91 | { | |
92 | int max_devs = if_max_devs[type]; | |
93 | return max_devs ? index % max_devs : index; | |
94 | } | |
95 | ||
96 | QemuOpts *drive_def(const char *optstr) | |
97 | { | |
98 | return qemu_opts_parse(qemu_find_opts("drive"), optstr, 0); | |
99 | } | |
100 | ||
101 | QemuOpts *drive_add(BlockInterfaceType type, int index, const char *file, | |
102 | const char *optstr) | |
103 | { | |
104 | QemuOpts *opts; | |
105 | char buf[32]; | |
106 | ||
107 | opts = drive_def(optstr); | |
108 | if (!opts) { | |
109 | return NULL; | |
110 | } | |
111 | if (type != IF_DEFAULT) { | |
112 | qemu_opt_set(opts, "if", if_name[type]); | |
113 | } | |
114 | if (index >= 0) { | |
115 | snprintf(buf, sizeof(buf), "%d", index); | |
116 | qemu_opt_set(opts, "index", buf); | |
117 | } | |
118 | if (file) | |
119 | qemu_opt_set(opts, "file", file); | |
120 | return opts; | |
121 | } | |
122 | ||
123 | DriveInfo *drive_get(BlockInterfaceType type, int bus, int unit) | |
124 | { | |
125 | DriveInfo *dinfo; | |
126 | ||
127 | /* seek interface, bus and unit */ | |
128 | ||
129 | QTAILQ_FOREACH(dinfo, &drives, next) { | |
130 | if (dinfo->type == type && | |
131 | dinfo->bus == bus && | |
132 | dinfo->unit == unit) | |
133 | return dinfo; | |
134 | } | |
135 | ||
136 | return NULL; | |
137 | } | |
138 | ||
139 | DriveInfo *drive_get_by_index(BlockInterfaceType type, int index) | |
140 | { | |
141 | return drive_get(type, | |
142 | drive_index_to_bus_id(type, index), | |
143 | drive_index_to_unit_id(type, index)); | |
144 | } | |
145 | ||
146 | int drive_get_max_bus(BlockInterfaceType type) | |
147 | { | |
148 | int max_bus; | |
149 | DriveInfo *dinfo; | |
150 | ||
151 | max_bus = -1; | |
152 | QTAILQ_FOREACH(dinfo, &drives, next) { | |
153 | if(dinfo->type == type && | |
154 | dinfo->bus > max_bus) | |
155 | max_bus = dinfo->bus; | |
156 | } | |
157 | return max_bus; | |
158 | } | |
159 | ||
160 | /* Get a block device. This should only be used for single-drive devices | |
161 | (e.g. SD/Floppy/MTD). Multi-disk devices (scsi/ide) should use the | |
162 | appropriate bus. */ | |
163 | DriveInfo *drive_get_next(BlockInterfaceType type) | |
164 | { | |
165 | static int next_block_unit[IF_COUNT]; | |
166 | ||
167 | return drive_get(type, 0, next_block_unit[type]++); | |
168 | } | |
169 | ||
170 | DriveInfo *drive_get_by_blockdev(BlockDriverState *bs) | |
171 | { | |
172 | DriveInfo *dinfo; | |
173 | ||
174 | QTAILQ_FOREACH(dinfo, &drives, next) { | |
175 | if (dinfo->bdrv == bs) { | |
176 | return dinfo; | |
177 | } | |
178 | } | |
179 | return NULL; | |
180 | } | |
181 | ||
182 | static void bdrv_format_print(void *opaque, const char *name) | |
183 | { | |
184 | error_printf(" %s", name); | |
185 | } | |
186 | ||
187 | static void drive_uninit(DriveInfo *dinfo) | |
188 | { | |
189 | qemu_opts_del(dinfo->opts); | |
190 | bdrv_delete(dinfo->bdrv); | |
191 | g_free(dinfo->id); | |
192 | QTAILQ_REMOVE(&drives, dinfo, next); | |
193 | g_free(dinfo); | |
194 | } | |
195 | ||
196 | void drive_put_ref(DriveInfo *dinfo) | |
197 | { | |
198 | assert(dinfo->refcount); | |
199 | if (--dinfo->refcount == 0) { | |
200 | drive_uninit(dinfo); | |
201 | } | |
202 | } | |
203 | ||
204 | void drive_get_ref(DriveInfo *dinfo) | |
205 | { | |
206 | dinfo->refcount++; | |
207 | } | |
208 | ||
209 | typedef struct { | |
210 | QEMUBH *bh; | |
211 | DriveInfo *dinfo; | |
212 | } DrivePutRefBH; | |
213 | ||
214 | static void drive_put_ref_bh(void *opaque) | |
215 | { | |
216 | DrivePutRefBH *s = opaque; | |
217 | ||
218 | drive_put_ref(s->dinfo); | |
219 | qemu_bh_delete(s->bh); | |
220 | g_free(s); | |
221 | } | |
222 | ||
223 | /* | |
224 | * Release a drive reference in a BH | |
225 | * | |
226 | * It is not possible to use drive_put_ref() from a callback function when the | |
227 | * callers still need the drive. In such cases we schedule a BH to release the | |
228 | * reference. | |
229 | */ | |
230 | static void drive_put_ref_bh_schedule(DriveInfo *dinfo) | |
231 | { | |
232 | DrivePutRefBH *s; | |
233 | ||
234 | s = g_new(DrivePutRefBH, 1); | |
235 | s->bh = qemu_bh_new(drive_put_ref_bh, s); | |
236 | s->dinfo = dinfo; | |
237 | qemu_bh_schedule(s->bh); | |
238 | } | |
239 | ||
240 | static int parse_block_error_action(const char *buf, int is_read) | |
241 | { | |
242 | if (!strcmp(buf, "ignore")) { | |
243 | return BLOCK_ERR_IGNORE; | |
244 | } else if (!is_read && !strcmp(buf, "enospc")) { | |
245 | return BLOCK_ERR_STOP_ENOSPC; | |
246 | } else if (!strcmp(buf, "stop")) { | |
247 | return BLOCK_ERR_STOP_ANY; | |
248 | } else if (!strcmp(buf, "report")) { | |
249 | return BLOCK_ERR_REPORT; | |
250 | } else { | |
251 | error_report("'%s' invalid %s error action", | |
252 | buf, is_read ? "read" : "write"); | |
253 | return -1; | |
254 | } | |
255 | } | |
256 | ||
257 | static bool do_check_io_limits(BlockIOLimit *io_limits) | |
258 | { | |
259 | bool bps_flag; | |
260 | bool iops_flag; | |
261 | ||
262 | assert(io_limits); | |
263 | ||
264 | bps_flag = (io_limits->bps[BLOCK_IO_LIMIT_TOTAL] != 0) | |
265 | && ((io_limits->bps[BLOCK_IO_LIMIT_READ] != 0) | |
266 | || (io_limits->bps[BLOCK_IO_LIMIT_WRITE] != 0)); | |
267 | iops_flag = (io_limits->iops[BLOCK_IO_LIMIT_TOTAL] != 0) | |
268 | && ((io_limits->iops[BLOCK_IO_LIMIT_READ] != 0) | |
269 | || (io_limits->iops[BLOCK_IO_LIMIT_WRITE] != 0)); | |
270 | if (bps_flag || iops_flag) { | |
271 | return false; | |
272 | } | |
273 | ||
274 | return true; | |
275 | } | |
276 | ||
277 | DriveInfo *drive_init(QemuOpts *opts, int default_to_scsi) | |
278 | { | |
279 | const char *buf; | |
280 | const char *file = NULL; | |
281 | const char *serial; | |
282 | const char *mediastr = ""; | |
283 | BlockInterfaceType type; | |
284 | enum { MEDIA_DISK, MEDIA_CDROM } media; | |
285 | int bus_id, unit_id; | |
286 | int cyls, heads, secs, translation; | |
287 | BlockDriver *drv = NULL; | |
288 | int max_devs; | |
289 | int index; | |
290 | int ro = 0; | |
291 | int bdrv_flags = 0; | |
292 | int on_read_error, on_write_error; | |
293 | const char *devaddr; | |
294 | DriveInfo *dinfo; | |
295 | BlockIOLimit io_limits; | |
296 | int snapshot = 0; | |
297 | bool copy_on_read; | |
298 | int ret; | |
299 | ||
300 | translation = BIOS_ATA_TRANSLATION_AUTO; | |
301 | media = MEDIA_DISK; | |
302 | ||
303 | /* extract parameters */ | |
304 | bus_id = qemu_opt_get_number(opts, "bus", 0); | |
305 | unit_id = qemu_opt_get_number(opts, "unit", -1); | |
306 | index = qemu_opt_get_number(opts, "index", -1); | |
307 | ||
308 | cyls = qemu_opt_get_number(opts, "cyls", 0); | |
309 | heads = qemu_opt_get_number(opts, "heads", 0); | |
310 | secs = qemu_opt_get_number(opts, "secs", 0); | |
311 | ||
312 | snapshot = qemu_opt_get_bool(opts, "snapshot", 0); | |
313 | ro = qemu_opt_get_bool(opts, "readonly", 0); | |
314 | copy_on_read = qemu_opt_get_bool(opts, "copy-on-read", false); | |
315 | ||
316 | file = qemu_opt_get(opts, "file"); | |
317 | serial = qemu_opt_get(opts, "serial"); | |
318 | ||
319 | if ((buf = qemu_opt_get(opts, "if")) != NULL) { | |
320 | for (type = 0; type < IF_COUNT && strcmp(buf, if_name[type]); type++) | |
321 | ; | |
322 | if (type == IF_COUNT) { | |
323 | error_report("unsupported bus type '%s'", buf); | |
324 | return NULL; | |
325 | } | |
326 | } else { | |
327 | type = default_to_scsi ? IF_SCSI : IF_IDE; | |
328 | } | |
329 | ||
330 | max_devs = if_max_devs[type]; | |
331 | ||
332 | if (cyls || heads || secs) { | |
333 | if (cyls < 1) { | |
334 | error_report("invalid physical cyls number"); | |
335 | return NULL; | |
336 | } | |
337 | if (heads < 1) { | |
338 | error_report("invalid physical heads number"); | |
339 | return NULL; | |
340 | } | |
341 | if (secs < 1) { | |
342 | error_report("invalid physical secs number"); | |
343 | return NULL; | |
344 | } | |
345 | } | |
346 | ||
347 | if ((buf = qemu_opt_get(opts, "trans")) != NULL) { | |
348 | if (!cyls) { | |
349 | error_report("'%s' trans must be used with cyls, heads and secs", | |
350 | buf); | |
351 | return NULL; | |
352 | } | |
353 | if (!strcmp(buf, "none")) | |
354 | translation = BIOS_ATA_TRANSLATION_NONE; | |
355 | else if (!strcmp(buf, "lba")) | |
356 | translation = BIOS_ATA_TRANSLATION_LBA; | |
357 | else if (!strcmp(buf, "auto")) | |
358 | translation = BIOS_ATA_TRANSLATION_AUTO; | |
359 | else { | |
360 | error_report("'%s' invalid translation type", buf); | |
361 | return NULL; | |
362 | } | |
363 | } | |
364 | ||
365 | if ((buf = qemu_opt_get(opts, "media")) != NULL) { | |
366 | if (!strcmp(buf, "disk")) { | |
367 | media = MEDIA_DISK; | |
368 | } else if (!strcmp(buf, "cdrom")) { | |
369 | if (cyls || secs || heads) { | |
370 | error_report("CHS can't be set with media=%s", buf); | |
371 | return NULL; | |
372 | } | |
373 | media = MEDIA_CDROM; | |
374 | } else { | |
375 | error_report("'%s' invalid media", buf); | |
376 | return NULL; | |
377 | } | |
378 | } | |
379 | ||
380 | bdrv_flags |= BDRV_O_CACHE_WB; | |
381 | if ((buf = qemu_opt_get(opts, "cache")) != NULL) { | |
382 | if (bdrv_parse_cache_flags(buf, &bdrv_flags) != 0) { | |
383 | error_report("invalid cache option"); | |
384 | return NULL; | |
385 | } | |
386 | } | |
387 | ||
388 | #ifdef CONFIG_LINUX_AIO | |
389 | if ((buf = qemu_opt_get(opts, "aio")) != NULL) { | |
390 | if (!strcmp(buf, "native")) { | |
391 | bdrv_flags |= BDRV_O_NATIVE_AIO; | |
392 | } else if (!strcmp(buf, "threads")) { | |
393 | /* this is the default */ | |
394 | } else { | |
395 | error_report("invalid aio option"); | |
396 | return NULL; | |
397 | } | |
398 | } | |
399 | #endif | |
400 | ||
401 | if ((buf = qemu_opt_get(opts, "format")) != NULL) { | |
402 | if (is_help_option(buf)) { | |
403 | error_printf("Supported formats:"); | |
404 | bdrv_iterate_format(bdrv_format_print, NULL); | |
405 | error_printf("\n"); | |
406 | return NULL; | |
407 | } | |
408 | drv = bdrv_find_whitelisted_format(buf); | |
409 | if (!drv) { | |
410 | error_report("'%s' invalid format", buf); | |
411 | return NULL; | |
412 | } | |
413 | } | |
414 | ||
415 | /* disk I/O throttling */ | |
416 | io_limits.bps[BLOCK_IO_LIMIT_TOTAL] = | |
417 | qemu_opt_get_number(opts, "bps", 0); | |
418 | io_limits.bps[BLOCK_IO_LIMIT_READ] = | |
419 | qemu_opt_get_number(opts, "bps_rd", 0); | |
420 | io_limits.bps[BLOCK_IO_LIMIT_WRITE] = | |
421 | qemu_opt_get_number(opts, "bps_wr", 0); | |
422 | io_limits.iops[BLOCK_IO_LIMIT_TOTAL] = | |
423 | qemu_opt_get_number(opts, "iops", 0); | |
424 | io_limits.iops[BLOCK_IO_LIMIT_READ] = | |
425 | qemu_opt_get_number(opts, "iops_rd", 0); | |
426 | io_limits.iops[BLOCK_IO_LIMIT_WRITE] = | |
427 | qemu_opt_get_number(opts, "iops_wr", 0); | |
428 | ||
429 | if (!do_check_io_limits(&io_limits)) { | |
430 | error_report("bps(iops) and bps_rd/bps_wr(iops_rd/iops_wr) " | |
431 | "cannot be used at the same time"); | |
432 | return NULL; | |
433 | } | |
434 | ||
435 | on_write_error = BLOCK_ERR_STOP_ENOSPC; | |
436 | if ((buf = qemu_opt_get(opts, "werror")) != NULL) { | |
437 | if (type != IF_IDE && type != IF_SCSI && type != IF_VIRTIO && type != IF_NONE) { | |
438 | error_report("werror is not supported by this bus type"); | |
439 | return NULL; | |
440 | } | |
441 | ||
442 | on_write_error = parse_block_error_action(buf, 0); | |
443 | if (on_write_error < 0) { | |
444 | return NULL; | |
445 | } | |
446 | } | |
447 | ||
448 | on_read_error = BLOCK_ERR_REPORT; | |
449 | if ((buf = qemu_opt_get(opts, "rerror")) != NULL) { | |
450 | if (type != IF_IDE && type != IF_VIRTIO && type != IF_SCSI && type != IF_NONE) { | |
451 | error_report("rerror is not supported by this bus type"); | |
452 | return NULL; | |
453 | } | |
454 | ||
455 | on_read_error = parse_block_error_action(buf, 1); | |
456 | if (on_read_error < 0) { | |
457 | return NULL; | |
458 | } | |
459 | } | |
460 | ||
461 | if ((devaddr = qemu_opt_get(opts, "addr")) != NULL) { | |
462 | if (type != IF_VIRTIO) { | |
463 | error_report("addr is not supported by this bus type"); | |
464 | return NULL; | |
465 | } | |
466 | } | |
467 | ||
468 | /* compute bus and unit according index */ | |
469 | ||
470 | if (index != -1) { | |
471 | if (bus_id != 0 || unit_id != -1) { | |
472 | error_report("index cannot be used with bus and unit"); | |
473 | return NULL; | |
474 | } | |
475 | bus_id = drive_index_to_bus_id(type, index); | |
476 | unit_id = drive_index_to_unit_id(type, index); | |
477 | } | |
478 | ||
479 | /* if user doesn't specify a unit_id, | |
480 | * try to find the first free | |
481 | */ | |
482 | ||
483 | if (unit_id == -1) { | |
484 | unit_id = 0; | |
485 | while (drive_get(type, bus_id, unit_id) != NULL) { | |
486 | unit_id++; | |
487 | if (max_devs && unit_id >= max_devs) { | |
488 | unit_id -= max_devs; | |
489 | bus_id++; | |
490 | } | |
491 | } | |
492 | } | |
493 | ||
494 | /* check unit id */ | |
495 | ||
496 | if (max_devs && unit_id >= max_devs) { | |
497 | error_report("unit %d too big (max is %d)", | |
498 | unit_id, max_devs - 1); | |
499 | return NULL; | |
500 | } | |
501 | ||
502 | /* | |
503 | * catch multiple definitions | |
504 | */ | |
505 | ||
506 | if (drive_get(type, bus_id, unit_id) != NULL) { | |
507 | error_report("drive with bus=%d, unit=%d (index=%d) exists", | |
508 | bus_id, unit_id, index); | |
509 | return NULL; | |
510 | } | |
511 | ||
512 | /* init */ | |
513 | ||
514 | dinfo = g_malloc0(sizeof(*dinfo)); | |
515 | if ((buf = qemu_opts_id(opts)) != NULL) { | |
516 | dinfo->id = g_strdup(buf); | |
517 | } else { | |
518 | /* no id supplied -> create one */ | |
519 | dinfo->id = g_malloc0(32); | |
520 | if (type == IF_IDE || type == IF_SCSI) | |
521 | mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd"; | |
522 | if (max_devs) | |
523 | snprintf(dinfo->id, 32, "%s%i%s%i", | |
524 | if_name[type], bus_id, mediastr, unit_id); | |
525 | else | |
526 | snprintf(dinfo->id, 32, "%s%s%i", | |
527 | if_name[type], mediastr, unit_id); | |
528 | } | |
529 | dinfo->bdrv = bdrv_new(dinfo->id); | |
530 | dinfo->devaddr = devaddr; | |
531 | dinfo->type = type; | |
532 | dinfo->bus = bus_id; | |
533 | dinfo->unit = unit_id; | |
534 | dinfo->cyls = cyls; | |
535 | dinfo->heads = heads; | |
536 | dinfo->secs = secs; | |
537 | dinfo->trans = translation; | |
538 | dinfo->opts = opts; | |
539 | dinfo->refcount = 1; | |
540 | dinfo->serial = serial; | |
541 | QTAILQ_INSERT_TAIL(&drives, dinfo, next); | |
542 | ||
543 | bdrv_set_on_error(dinfo->bdrv, on_read_error, on_write_error); | |
544 | ||
545 | /* disk I/O throttling */ | |
546 | bdrv_set_io_limits(dinfo->bdrv, &io_limits); | |
547 | ||
548 | switch(type) { | |
549 | case IF_IDE: | |
550 | case IF_SCSI: | |
551 | case IF_XEN: | |
552 | case IF_NONE: | |
553 | dinfo->media_cd = media == MEDIA_CDROM; | |
554 | break; | |
555 | case IF_SD: | |
556 | case IF_FLOPPY: | |
557 | case IF_PFLASH: | |
558 | case IF_MTD: | |
559 | break; | |
560 | case IF_VIRTIO: | |
561 | /* add virtio block device */ | |
562 | opts = qemu_opts_create(qemu_find_opts("device"), NULL, 0, NULL); | |
563 | if (arch_type == QEMU_ARCH_S390X) { | |
564 | qemu_opt_set(opts, "driver", "virtio-blk-s390"); | |
565 | } else { | |
566 | qemu_opt_set(opts, "driver", "virtio-blk-pci"); | |
567 | } | |
568 | qemu_opt_set(opts, "drive", dinfo->id); | |
569 | if (devaddr) | |
570 | qemu_opt_set(opts, "addr", devaddr); | |
571 | break; | |
572 | default: | |
573 | abort(); | |
574 | } | |
575 | if (!file || !*file) { | |
576 | return dinfo; | |
577 | } | |
578 | if (snapshot) { | |
579 | /* always use cache=unsafe with snapshot */ | |
580 | bdrv_flags &= ~BDRV_O_CACHE_MASK; | |
581 | bdrv_flags |= (BDRV_O_SNAPSHOT|BDRV_O_CACHE_WB|BDRV_O_NO_FLUSH); | |
582 | } | |
583 | ||
584 | if (copy_on_read) { | |
585 | bdrv_flags |= BDRV_O_COPY_ON_READ; | |
586 | } | |
587 | ||
588 | if (runstate_check(RUN_STATE_INMIGRATE)) { | |
589 | bdrv_flags |= BDRV_O_INCOMING; | |
590 | } | |
591 | ||
592 | if (media == MEDIA_CDROM) { | |
593 | /* CDROM is fine for any interface, don't check. */ | |
594 | ro = 1; | |
595 | } else if (ro == 1) { | |
596 | if (type != IF_SCSI && type != IF_VIRTIO && type != IF_FLOPPY && | |
597 | type != IF_NONE && type != IF_PFLASH) { | |
598 | error_report("readonly not supported by this bus type"); | |
599 | goto err; | |
600 | } | |
601 | } | |
602 | ||
603 | bdrv_flags |= ro ? 0 : BDRV_O_RDWR; | |
604 | ||
605 | if (ro && copy_on_read) { | |
606 | error_report("warning: disabling copy_on_read on readonly drive"); | |
607 | } | |
608 | ||
609 | ret = bdrv_open(dinfo->bdrv, file, bdrv_flags, drv); | |
610 | if (ret < 0) { | |
611 | error_report("could not open disk image %s: %s", | |
612 | file, strerror(-ret)); | |
613 | goto err; | |
614 | } | |
615 | ||
616 | if (bdrv_key_required(dinfo->bdrv)) | |
617 | autostart = 0; | |
618 | return dinfo; | |
619 | ||
620 | err: | |
621 | bdrv_delete(dinfo->bdrv); | |
622 | g_free(dinfo->id); | |
623 | QTAILQ_REMOVE(&drives, dinfo, next); | |
624 | g_free(dinfo); | |
625 | return NULL; | |
626 | } | |
627 | ||
628 | void do_commit(Monitor *mon, const QDict *qdict) | |
629 | { | |
630 | const char *device = qdict_get_str(qdict, "device"); | |
631 | BlockDriverState *bs; | |
632 | int ret; | |
633 | ||
634 | if (!strcmp(device, "all")) { | |
635 | ret = bdrv_commit_all(); | |
636 | if (ret == -EBUSY) { | |
637 | qerror_report(QERR_DEVICE_IN_USE, device); | |
638 | return; | |
639 | } | |
640 | } else { | |
641 | bs = bdrv_find(device); | |
642 | if (!bs) { | |
643 | qerror_report(QERR_DEVICE_NOT_FOUND, device); | |
644 | return; | |
645 | } | |
646 | ret = bdrv_commit(bs); | |
647 | if (ret == -EBUSY) { | |
648 | qerror_report(QERR_DEVICE_IN_USE, device); | |
649 | return; | |
650 | } | |
651 | } | |
652 | } | |
653 | ||
654 | static void blockdev_do_action(int kind, void *data, Error **errp) | |
655 | { | |
656 | BlockdevAction action; | |
657 | BlockdevActionList list; | |
658 | ||
659 | action.kind = kind; | |
660 | action.data = data; | |
661 | list.value = &action; | |
662 | list.next = NULL; | |
663 | qmp_transaction(&list, errp); | |
664 | } | |
665 | ||
666 | void qmp_blockdev_snapshot_sync(const char *device, const char *snapshot_file, | |
667 | bool has_format, const char *format, | |
668 | bool has_mode, enum NewImageMode mode, | |
669 | Error **errp) | |
670 | { | |
671 | BlockdevSnapshot snapshot = { | |
672 | .device = (char *) device, | |
673 | .snapshot_file = (char *) snapshot_file, | |
674 | .has_format = has_format, | |
675 | .format = (char *) format, | |
676 | .has_mode = has_mode, | |
677 | .mode = mode, | |
678 | }; | |
679 | blockdev_do_action(BLOCKDEV_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC, &snapshot, | |
680 | errp); | |
681 | } | |
682 | ||
683 | ||
684 | /* New and old BlockDriverState structs for group snapshots */ | |
685 | typedef struct BlkTransactionStates { | |
686 | BlockDriverState *old_bs; | |
687 | BlockDriverState *new_bs; | |
688 | QSIMPLEQ_ENTRY(BlkTransactionStates) entry; | |
689 | } BlkTransactionStates; | |
690 | ||
691 | /* | |
692 | * 'Atomic' group snapshots. The snapshots are taken as a set, and if any fail | |
693 | * then we do not pivot any of the devices in the group, and abandon the | |
694 | * snapshots | |
695 | */ | |
696 | void qmp_transaction(BlockdevActionList *dev_list, Error **errp) | |
697 | { | |
698 | int ret = 0; | |
699 | BlockdevActionList *dev_entry = dev_list; | |
700 | BlkTransactionStates *states, *next; | |
701 | ||
702 | QSIMPLEQ_HEAD(snap_bdrv_states, BlkTransactionStates) snap_bdrv_states; | |
703 | QSIMPLEQ_INIT(&snap_bdrv_states); | |
704 | ||
705 | /* drain all i/o before any snapshots */ | |
706 | bdrv_drain_all(); | |
707 | ||
708 | /* We don't do anything in this loop that commits us to the snapshot */ | |
709 | while (NULL != dev_entry) { | |
710 | BlockdevAction *dev_info = NULL; | |
711 | BlockDriver *proto_drv; | |
712 | BlockDriver *drv; | |
713 | int flags; | |
714 | enum NewImageMode mode; | |
715 | const char *new_image_file; | |
716 | const char *device; | |
717 | const char *format = "qcow2"; | |
718 | ||
719 | dev_info = dev_entry->value; | |
720 | dev_entry = dev_entry->next; | |
721 | ||
722 | states = g_malloc0(sizeof(BlkTransactionStates)); | |
723 | QSIMPLEQ_INSERT_TAIL(&snap_bdrv_states, states, entry); | |
724 | ||
725 | switch (dev_info->kind) { | |
726 | case BLOCKDEV_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC: | |
727 | device = dev_info->blockdev_snapshot_sync->device; | |
728 | if (!dev_info->blockdev_snapshot_sync->has_mode) { | |
729 | dev_info->blockdev_snapshot_sync->mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS; | |
730 | } | |
731 | new_image_file = dev_info->blockdev_snapshot_sync->snapshot_file; | |
732 | if (dev_info->blockdev_snapshot_sync->has_format) { | |
733 | format = dev_info->blockdev_snapshot_sync->format; | |
734 | } | |
735 | mode = dev_info->blockdev_snapshot_sync->mode; | |
736 | break; | |
737 | default: | |
738 | abort(); | |
739 | } | |
740 | ||
741 | drv = bdrv_find_format(format); | |
742 | if (!drv) { | |
743 | error_set(errp, QERR_INVALID_BLOCK_FORMAT, format); | |
744 | goto delete_and_fail; | |
745 | } | |
746 | ||
747 | states->old_bs = bdrv_find(device); | |
748 | if (!states->old_bs) { | |
749 | error_set(errp, QERR_DEVICE_NOT_FOUND, device); | |
750 | goto delete_and_fail; | |
751 | } | |
752 | ||
753 | if (!bdrv_is_inserted(states->old_bs)) { | |
754 | error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); | |
755 | goto delete_and_fail; | |
756 | } | |
757 | ||
758 | if (bdrv_in_use(states->old_bs)) { | |
759 | error_set(errp, QERR_DEVICE_IN_USE, device); | |
760 | goto delete_and_fail; | |
761 | } | |
762 | ||
763 | if (!bdrv_is_read_only(states->old_bs)) { | |
764 | if (bdrv_flush(states->old_bs)) { | |
765 | error_set(errp, QERR_IO_ERROR); | |
766 | goto delete_and_fail; | |
767 | } | |
768 | } | |
769 | ||
770 | flags = states->old_bs->open_flags; | |
771 | ||
772 | proto_drv = bdrv_find_protocol(new_image_file); | |
773 | if (!proto_drv) { | |
774 | error_set(errp, QERR_INVALID_BLOCK_FORMAT, format); | |
775 | goto delete_and_fail; | |
776 | } | |
777 | ||
778 | /* create new image w/backing file */ | |
779 | if (mode != NEW_IMAGE_MODE_EXISTING) { | |
780 | ret = bdrv_img_create(new_image_file, format, | |
781 | states->old_bs->filename, | |
782 | states->old_bs->drv->format_name, | |
783 | NULL, -1, flags); | |
784 | if (ret) { | |
785 | error_set(errp, QERR_OPEN_FILE_FAILED, new_image_file); | |
786 | goto delete_and_fail; | |
787 | } | |
788 | } | |
789 | ||
790 | /* We will manually add the backing_hd field to the bs later */ | |
791 | states->new_bs = bdrv_new(""); | |
792 | ret = bdrv_open(states->new_bs, new_image_file, | |
793 | flags | BDRV_O_NO_BACKING, drv); | |
794 | if (ret != 0) { | |
795 | error_set(errp, QERR_OPEN_FILE_FAILED, new_image_file); | |
796 | goto delete_and_fail; | |
797 | } | |
798 | } | |
799 | ||
800 | ||
801 | /* Now we are going to do the actual pivot. Everything up to this point | |
802 | * is reversible, but we are committed at this point */ | |
803 | QSIMPLEQ_FOREACH(states, &snap_bdrv_states, entry) { | |
804 | /* This removes our old bs from the bdrv_states, and adds the new bs */ | |
805 | bdrv_append(states->new_bs, states->old_bs); | |
806 | } | |
807 | ||
808 | /* success */ | |
809 | goto exit; | |
810 | ||
811 | delete_and_fail: | |
812 | /* | |
813 | * failure, and it is all-or-none; abandon each new bs, and keep using | |
814 | * the original bs for all images | |
815 | */ | |
816 | QSIMPLEQ_FOREACH(states, &snap_bdrv_states, entry) { | |
817 | if (states->new_bs) { | |
818 | bdrv_delete(states->new_bs); | |
819 | } | |
820 | } | |
821 | exit: | |
822 | QSIMPLEQ_FOREACH_SAFE(states, &snap_bdrv_states, entry, next) { | |
823 | g_free(states); | |
824 | } | |
825 | return; | |
826 | } | |
827 | ||
828 | ||
829 | static void eject_device(BlockDriverState *bs, int force, Error **errp) | |
830 | { | |
831 | if (bdrv_in_use(bs)) { | |
832 | error_set(errp, QERR_DEVICE_IN_USE, bdrv_get_device_name(bs)); | |
833 | return; | |
834 | } | |
835 | if (!bdrv_dev_has_removable_media(bs)) { | |
836 | error_set(errp, QERR_DEVICE_NOT_REMOVABLE, bdrv_get_device_name(bs)); | |
837 | return; | |
838 | } | |
839 | ||
840 | if (bdrv_dev_is_medium_locked(bs) && !bdrv_dev_is_tray_open(bs)) { | |
841 | bdrv_dev_eject_request(bs, force); | |
842 | if (!force) { | |
843 | error_set(errp, QERR_DEVICE_LOCKED, bdrv_get_device_name(bs)); | |
844 | return; | |
845 | } | |
846 | } | |
847 | ||
848 | bdrv_close(bs); | |
849 | } | |
850 | ||
851 | void qmp_eject(const char *device, bool has_force, bool force, Error **errp) | |
852 | { | |
853 | BlockDriverState *bs; | |
854 | ||
855 | bs = bdrv_find(device); | |
856 | if (!bs) { | |
857 | error_set(errp, QERR_DEVICE_NOT_FOUND, device); | |
858 | return; | |
859 | } | |
860 | ||
861 | eject_device(bs, force, errp); | |
862 | } | |
863 | ||
864 | void qmp_block_passwd(const char *device, const char *password, Error **errp) | |
865 | { | |
866 | BlockDriverState *bs; | |
867 | int err; | |
868 | ||
869 | bs = bdrv_find(device); | |
870 | if (!bs) { | |
871 | error_set(errp, QERR_DEVICE_NOT_FOUND, device); | |
872 | return; | |
873 | } | |
874 | ||
875 | err = bdrv_set_key(bs, password); | |
876 | if (err == -EINVAL) { | |
877 | error_set(errp, QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs)); | |
878 | return; | |
879 | } else if (err < 0) { | |
880 | error_set(errp, QERR_INVALID_PASSWORD); | |
881 | return; | |
882 | } | |
883 | } | |
884 | ||
885 | static void qmp_bdrv_open_encrypted(BlockDriverState *bs, const char *filename, | |
886 | int bdrv_flags, BlockDriver *drv, | |
887 | const char *password, Error **errp) | |
888 | { | |
889 | if (bdrv_open(bs, filename, bdrv_flags, drv) < 0) { | |
890 | error_set(errp, QERR_OPEN_FILE_FAILED, filename); | |
891 | return; | |
892 | } | |
893 | ||
894 | if (bdrv_key_required(bs)) { | |
895 | if (password) { | |
896 | if (bdrv_set_key(bs, password) < 0) { | |
897 | error_set(errp, QERR_INVALID_PASSWORD); | |
898 | } | |
899 | } else { | |
900 | error_set(errp, QERR_DEVICE_ENCRYPTED, bdrv_get_device_name(bs), | |
901 | bdrv_get_encrypted_filename(bs)); | |
902 | } | |
903 | } else if (password) { | |
904 | error_set(errp, QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs)); | |
905 | } | |
906 | } | |
907 | ||
908 | void qmp_change_blockdev(const char *device, const char *filename, | |
909 | bool has_format, const char *format, Error **errp) | |
910 | { | |
911 | BlockDriverState *bs; | |
912 | BlockDriver *drv = NULL; | |
913 | int bdrv_flags; | |
914 | Error *err = NULL; | |
915 | ||
916 | bs = bdrv_find(device); | |
917 | if (!bs) { | |
918 | error_set(errp, QERR_DEVICE_NOT_FOUND, device); | |
919 | return; | |
920 | } | |
921 | ||
922 | if (format) { | |
923 | drv = bdrv_find_whitelisted_format(format); | |
924 | if (!drv) { | |
925 | error_set(errp, QERR_INVALID_BLOCK_FORMAT, format); | |
926 | return; | |
927 | } | |
928 | } | |
929 | ||
930 | eject_device(bs, 0, &err); | |
931 | if (error_is_set(&err)) { | |
932 | error_propagate(errp, err); | |
933 | return; | |
934 | } | |
935 | ||
936 | bdrv_flags = bdrv_is_read_only(bs) ? 0 : BDRV_O_RDWR; | |
937 | bdrv_flags |= bdrv_is_snapshot(bs) ? BDRV_O_SNAPSHOT : 0; | |
938 | ||
939 | qmp_bdrv_open_encrypted(bs, filename, bdrv_flags, drv, NULL, errp); | |
940 | } | |
941 | ||
942 | /* throttling disk I/O limits */ | |
943 | void qmp_block_set_io_throttle(const char *device, int64_t bps, int64_t bps_rd, | |
944 | int64_t bps_wr, int64_t iops, int64_t iops_rd, | |
945 | int64_t iops_wr, Error **errp) | |
946 | { | |
947 | BlockIOLimit io_limits; | |
948 | BlockDriverState *bs; | |
949 | ||
950 | bs = bdrv_find(device); | |
951 | if (!bs) { | |
952 | error_set(errp, QERR_DEVICE_NOT_FOUND, device); | |
953 | return; | |
954 | } | |
955 | ||
956 | io_limits.bps[BLOCK_IO_LIMIT_TOTAL] = bps; | |
957 | io_limits.bps[BLOCK_IO_LIMIT_READ] = bps_rd; | |
958 | io_limits.bps[BLOCK_IO_LIMIT_WRITE] = bps_wr; | |
959 | io_limits.iops[BLOCK_IO_LIMIT_TOTAL]= iops; | |
960 | io_limits.iops[BLOCK_IO_LIMIT_READ] = iops_rd; | |
961 | io_limits.iops[BLOCK_IO_LIMIT_WRITE]= iops_wr; | |
962 | ||
963 | if (!do_check_io_limits(&io_limits)) { | |
964 | error_set(errp, QERR_INVALID_PARAMETER_COMBINATION); | |
965 | return; | |
966 | } | |
967 | ||
968 | bs->io_limits = io_limits; | |
969 | bs->slice_time = BLOCK_IO_SLICE_TIME; | |
970 | ||
971 | if (!bs->io_limits_enabled && bdrv_io_limits_enabled(bs)) { | |
972 | bdrv_io_limits_enable(bs); | |
973 | } else if (bs->io_limits_enabled && !bdrv_io_limits_enabled(bs)) { | |
974 | bdrv_io_limits_disable(bs); | |
975 | } else { | |
976 | if (bs->block_timer) { | |
977 | qemu_mod_timer(bs->block_timer, qemu_get_clock_ns(vm_clock)); | |
978 | } | |
979 | } | |
980 | } | |
981 | ||
982 | int do_drive_del(Monitor *mon, const QDict *qdict, QObject **ret_data) | |
983 | { | |
984 | const char *id = qdict_get_str(qdict, "id"); | |
985 | BlockDriverState *bs; | |
986 | ||
987 | bs = bdrv_find(id); | |
988 | if (!bs) { | |
989 | qerror_report(QERR_DEVICE_NOT_FOUND, id); | |
990 | return -1; | |
991 | } | |
992 | if (bdrv_in_use(bs)) { | |
993 | qerror_report(QERR_DEVICE_IN_USE, id); | |
994 | return -1; | |
995 | } | |
996 | ||
997 | /* quiesce block driver; prevent further io */ | |
998 | bdrv_drain_all(); | |
999 | bdrv_flush(bs); | |
1000 | bdrv_close(bs); | |
1001 | ||
1002 | /* if we have a device attached to this BlockDriverState | |
1003 | * then we need to make the drive anonymous until the device | |
1004 | * can be removed. If this is a drive with no device backing | |
1005 | * then we can just get rid of the block driver state right here. | |
1006 | */ | |
1007 | if (bdrv_get_attached_dev(bs)) { | |
1008 | bdrv_make_anon(bs); | |
1009 | } else { | |
1010 | drive_uninit(drive_get_by_blockdev(bs)); | |
1011 | } | |
1012 | ||
1013 | return 0; | |
1014 | } | |
1015 | ||
1016 | void qmp_block_resize(const char *device, int64_t size, Error **errp) | |
1017 | { | |
1018 | BlockDriverState *bs; | |
1019 | ||
1020 | bs = bdrv_find(device); | |
1021 | if (!bs) { | |
1022 | error_set(errp, QERR_DEVICE_NOT_FOUND, device); | |
1023 | return; | |
1024 | } | |
1025 | ||
1026 | if (size < 0) { | |
1027 | error_set(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size"); | |
1028 | return; | |
1029 | } | |
1030 | ||
1031 | switch (bdrv_truncate(bs, size)) { | |
1032 | case 0: | |
1033 | break; | |
1034 | case -ENOMEDIUM: | |
1035 | error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); | |
1036 | break; | |
1037 | case -ENOTSUP: | |
1038 | error_set(errp, QERR_UNSUPPORTED); | |
1039 | break; | |
1040 | case -EACCES: | |
1041 | error_set(errp, QERR_DEVICE_IS_READ_ONLY, device); | |
1042 | break; | |
1043 | case -EBUSY: | |
1044 | error_set(errp, QERR_DEVICE_IN_USE, device); | |
1045 | break; | |
1046 | default: | |
1047 | error_set(errp, QERR_UNDEFINED_ERROR); | |
1048 | break; | |
1049 | } | |
1050 | } | |
1051 | ||
1052 | static QObject *qobject_from_block_job(BlockJob *job) | |
1053 | { | |
1054 | return qobject_from_jsonf("{ 'type': %s," | |
1055 | "'device': %s," | |
1056 | "'len': %" PRId64 "," | |
1057 | "'offset': %" PRId64 "," | |
1058 | "'speed': %" PRId64 " }", | |
1059 | job->job_type->job_type, | |
1060 | bdrv_get_device_name(job->bs), | |
1061 | job->len, | |
1062 | job->offset, | |
1063 | job->speed); | |
1064 | } | |
1065 | ||
1066 | static void block_stream_cb(void *opaque, int ret) | |
1067 | { | |
1068 | BlockDriverState *bs = opaque; | |
1069 | QObject *obj; | |
1070 | ||
1071 | trace_block_stream_cb(bs, bs->job, ret); | |
1072 | ||
1073 | assert(bs->job); | |
1074 | obj = qobject_from_block_job(bs->job); | |
1075 | if (ret < 0) { | |
1076 | QDict *dict = qobject_to_qdict(obj); | |
1077 | qdict_put(dict, "error", qstring_from_str(strerror(-ret))); | |
1078 | } | |
1079 | ||
1080 | if (block_job_is_cancelled(bs->job)) { | |
1081 | monitor_protocol_event(QEVENT_BLOCK_JOB_CANCELLED, obj); | |
1082 | } else { | |
1083 | monitor_protocol_event(QEVENT_BLOCK_JOB_COMPLETED, obj); | |
1084 | } | |
1085 | qobject_decref(obj); | |
1086 | ||
1087 | drive_put_ref_bh_schedule(drive_get_by_blockdev(bs)); | |
1088 | } | |
1089 | ||
1090 | void qmp_block_stream(const char *device, bool has_base, | |
1091 | const char *base, bool has_speed, | |
1092 | int64_t speed, Error **errp) | |
1093 | { | |
1094 | BlockDriverState *bs; | |
1095 | BlockDriverState *base_bs = NULL; | |
1096 | Error *local_err = NULL; | |
1097 | ||
1098 | bs = bdrv_find(device); | |
1099 | if (!bs) { | |
1100 | error_set(errp, QERR_DEVICE_NOT_FOUND, device); | |
1101 | return; | |
1102 | } | |
1103 | ||
1104 | if (base) { | |
1105 | base_bs = bdrv_find_backing_image(bs, base); | |
1106 | if (base_bs == NULL) { | |
1107 | error_set(errp, QERR_BASE_NOT_FOUND, base); | |
1108 | return; | |
1109 | } | |
1110 | } | |
1111 | ||
1112 | stream_start(bs, base_bs, base, has_speed ? speed : 0, | |
1113 | block_stream_cb, bs, &local_err); | |
1114 | if (error_is_set(&local_err)) { | |
1115 | error_propagate(errp, local_err); | |
1116 | return; | |
1117 | } | |
1118 | ||
1119 | /* Grab a reference so hotplug does not delete the BlockDriverState from | |
1120 | * underneath us. | |
1121 | */ | |
1122 | drive_get_ref(drive_get_by_blockdev(bs)); | |
1123 | ||
1124 | trace_qmp_block_stream(bs, bs->job); | |
1125 | } | |
1126 | ||
1127 | static BlockJob *find_block_job(const char *device) | |
1128 | { | |
1129 | BlockDriverState *bs; | |
1130 | ||
1131 | bs = bdrv_find(device); | |
1132 | if (!bs || !bs->job) { | |
1133 | return NULL; | |
1134 | } | |
1135 | return bs->job; | |
1136 | } | |
1137 | ||
1138 | void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp) | |
1139 | { | |
1140 | BlockJob *job = find_block_job(device); | |
1141 | ||
1142 | if (!job) { | |
1143 | error_set(errp, QERR_DEVICE_NOT_ACTIVE, device); | |
1144 | return; | |
1145 | } | |
1146 | ||
1147 | block_job_set_speed(job, speed, errp); | |
1148 | } | |
1149 | ||
1150 | void qmp_block_job_cancel(const char *device, Error **errp) | |
1151 | { | |
1152 | BlockJob *job = find_block_job(device); | |
1153 | ||
1154 | if (!job) { | |
1155 | error_set(errp, QERR_DEVICE_NOT_ACTIVE, device); | |
1156 | return; | |
1157 | } | |
1158 | ||
1159 | trace_qmp_block_job_cancel(job); | |
1160 | block_job_cancel(job); | |
1161 | } | |
1162 | ||
1163 | static void do_qmp_query_block_jobs_one(void *opaque, BlockDriverState *bs) | |
1164 | { | |
1165 | BlockJobInfoList **prev = opaque; | |
1166 | BlockJob *job = bs->job; | |
1167 | ||
1168 | if (job) { | |
1169 | BlockJobInfoList *elem; | |
1170 | BlockJobInfo *info = g_new(BlockJobInfo, 1); | |
1171 | *info = (BlockJobInfo){ | |
1172 | .type = g_strdup(job->job_type->job_type), | |
1173 | .device = g_strdup(bdrv_get_device_name(bs)), | |
1174 | .len = job->len, | |
1175 | .offset = job->offset, | |
1176 | .speed = job->speed, | |
1177 | }; | |
1178 | ||
1179 | elem = g_new0(BlockJobInfoList, 1); | |
1180 | elem->value = info; | |
1181 | ||
1182 | (*prev)->next = elem; | |
1183 | *prev = elem; | |
1184 | } | |
1185 | } | |
1186 | ||
1187 | BlockJobInfoList *qmp_query_block_jobs(Error **errp) | |
1188 | { | |
1189 | /* Dummy is a fake list element for holding the head pointer */ | |
1190 | BlockJobInfoList dummy = {}; | |
1191 | BlockJobInfoList *prev = &dummy; | |
1192 | bdrv_iterate(do_qmp_query_block_jobs_one, &prev); | |
1193 | return dummy.next; | |
1194 | } |