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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 "block.h" | |
11 | #include "blockdev.h" | |
12 | #include "monitor.h" | |
13 | #include "qerror.h" | |
14 | #include "qemu-option.h" | |
15 | #include "qemu-config.h" | |
16 | #include "sysemu.h" | |
17 | #include "hw/qdev.h" | |
18 | #include "block_int.h" | |
19 | ||
20 | static QTAILQ_HEAD(drivelist, DriveInfo) drives = QTAILQ_HEAD_INITIALIZER(drives); | |
21 | ||
22 | static const char *const if_name[IF_COUNT] = { | |
23 | [IF_NONE] = "none", | |
24 | [IF_IDE] = "ide", | |
25 | [IF_SCSI] = "scsi", | |
26 | [IF_FLOPPY] = "floppy", | |
27 | [IF_PFLASH] = "pflash", | |
28 | [IF_MTD] = "mtd", | |
29 | [IF_SD] = "sd", | |
30 | [IF_VIRTIO] = "virtio", | |
31 | [IF_XEN] = "xen", | |
32 | }; | |
33 | ||
34 | static const int if_max_devs[IF_COUNT] = { | |
35 | /* | |
36 | * Do not change these numbers! They govern how drive option | |
37 | * index maps to unit and bus. That mapping is ABI. | |
38 | * | |
39 | * All controllers used to imlement if=T drives need to support | |
40 | * if_max_devs[T] units, for any T with if_max_devs[T] != 0. | |
41 | * Otherwise, some index values map to "impossible" bus, unit | |
42 | * values. | |
43 | * | |
44 | * For instance, if you change [IF_SCSI] to 255, -drive | |
45 | * if=scsi,index=12 no longer means bus=1,unit=5, but | |
46 | * bus=0,unit=12. With an lsi53c895a controller (7 units max), | |
47 | * the drive can't be set up. Regression. | |
48 | */ | |
49 | [IF_IDE] = 2, | |
50 | [IF_SCSI] = 7, | |
51 | }; | |
52 | ||
53 | /* | |
54 | * We automatically delete the drive when a device using it gets | |
55 | * unplugged. Questionable feature, but we can't just drop it. | |
56 | * Device models call blockdev_mark_auto_del() to schedule the | |
57 | * automatic deletion, and generic qdev code calls blockdev_auto_del() | |
58 | * when deletion is actually safe. | |
59 | */ | |
60 | void blockdev_mark_auto_del(BlockDriverState *bs) | |
61 | { | |
62 | DriveInfo *dinfo = drive_get_by_blockdev(bs); | |
63 | ||
64 | if (dinfo) { | |
65 | dinfo->auto_del = 1; | |
66 | } | |
67 | } | |
68 | ||
69 | void blockdev_auto_del(BlockDriverState *bs) | |
70 | { | |
71 | DriveInfo *dinfo = drive_get_by_blockdev(bs); | |
72 | ||
73 | if (dinfo && dinfo->auto_del) { | |
74 | drive_put_ref(dinfo); | |
75 | } | |
76 | } | |
77 | ||
78 | static int drive_index_to_bus_id(BlockInterfaceType type, int index) | |
79 | { | |
80 | int max_devs = if_max_devs[type]; | |
81 | return max_devs ? index / max_devs : 0; | |
82 | } | |
83 | ||
84 | static int drive_index_to_unit_id(BlockInterfaceType type, int index) | |
85 | { | |
86 | int max_devs = if_max_devs[type]; | |
87 | return max_devs ? index % max_devs : index; | |
88 | } | |
89 | ||
90 | QemuOpts *drive_def(const char *optstr) | |
91 | { | |
92 | return qemu_opts_parse(qemu_find_opts("drive"), optstr, 0); | |
93 | } | |
94 | ||
95 | QemuOpts *drive_add(BlockInterfaceType type, int index, const char *file, | |
96 | const char *optstr) | |
97 | { | |
98 | QemuOpts *opts; | |
99 | char buf[32]; | |
100 | ||
101 | opts = drive_def(optstr); | |
102 | if (!opts) { | |
103 | return NULL; | |
104 | } | |
105 | if (type != IF_DEFAULT) { | |
106 | qemu_opt_set(opts, "if", if_name[type]); | |
107 | } | |
108 | if (index >= 0) { | |
109 | snprintf(buf, sizeof(buf), "%d", index); | |
110 | qemu_opt_set(opts, "index", buf); | |
111 | } | |
112 | if (file) | |
113 | qemu_opt_set(opts, "file", file); | |
114 | return opts; | |
115 | } | |
116 | ||
117 | DriveInfo *drive_get(BlockInterfaceType type, int bus, int unit) | |
118 | { | |
119 | DriveInfo *dinfo; | |
120 | ||
121 | /* seek interface, bus and unit */ | |
122 | ||
123 | QTAILQ_FOREACH(dinfo, &drives, next) { | |
124 | if (dinfo->type == type && | |
125 | dinfo->bus == bus && | |
126 | dinfo->unit == unit) | |
127 | return dinfo; | |
128 | } | |
129 | ||
130 | return NULL; | |
131 | } | |
132 | ||
133 | DriveInfo *drive_get_by_index(BlockInterfaceType type, int index) | |
134 | { | |
135 | return drive_get(type, | |
136 | drive_index_to_bus_id(type, index), | |
137 | drive_index_to_unit_id(type, index)); | |
138 | } | |
139 | ||
140 | int drive_get_max_bus(BlockInterfaceType type) | |
141 | { | |
142 | int max_bus; | |
143 | DriveInfo *dinfo; | |
144 | ||
145 | max_bus = -1; | |
146 | QTAILQ_FOREACH(dinfo, &drives, next) { | |
147 | if(dinfo->type == type && | |
148 | dinfo->bus > max_bus) | |
149 | max_bus = dinfo->bus; | |
150 | } | |
151 | return max_bus; | |
152 | } | |
153 | ||
154 | /* Get a block device. This should only be used for single-drive devices | |
155 | (e.g. SD/Floppy/MTD). Multi-disk devices (scsi/ide) should use the | |
156 | appropriate bus. */ | |
157 | DriveInfo *drive_get_next(BlockInterfaceType type) | |
158 | { | |
159 | static int next_block_unit[IF_COUNT]; | |
160 | ||
161 | return drive_get(type, 0, next_block_unit[type]++); | |
162 | } | |
163 | ||
164 | DriveInfo *drive_get_by_blockdev(BlockDriverState *bs) | |
165 | { | |
166 | DriveInfo *dinfo; | |
167 | ||
168 | QTAILQ_FOREACH(dinfo, &drives, next) { | |
169 | if (dinfo->bdrv == bs) { | |
170 | return dinfo; | |
171 | } | |
172 | } | |
173 | return NULL; | |
174 | } | |
175 | ||
176 | static void bdrv_format_print(void *opaque, const char *name) | |
177 | { | |
178 | error_printf(" %s", name); | |
179 | } | |
180 | ||
181 | static void drive_uninit(DriveInfo *dinfo) | |
182 | { | |
183 | qemu_opts_del(dinfo->opts); | |
184 | bdrv_delete(dinfo->bdrv); | |
185 | qemu_free(dinfo->id); | |
186 | QTAILQ_REMOVE(&drives, dinfo, next); | |
187 | qemu_free(dinfo); | |
188 | } | |
189 | ||
190 | void drive_put_ref(DriveInfo *dinfo) | |
191 | { | |
192 | assert(dinfo->refcount); | |
193 | if (--dinfo->refcount == 0) { | |
194 | drive_uninit(dinfo); | |
195 | } | |
196 | } | |
197 | ||
198 | void drive_get_ref(DriveInfo *dinfo) | |
199 | { | |
200 | dinfo->refcount++; | |
201 | } | |
202 | ||
203 | static int parse_block_error_action(const char *buf, int is_read) | |
204 | { | |
205 | if (!strcmp(buf, "ignore")) { | |
206 | return BLOCK_ERR_IGNORE; | |
207 | } else if (!is_read && !strcmp(buf, "enospc")) { | |
208 | return BLOCK_ERR_STOP_ENOSPC; | |
209 | } else if (!strcmp(buf, "stop")) { | |
210 | return BLOCK_ERR_STOP_ANY; | |
211 | } else if (!strcmp(buf, "report")) { | |
212 | return BLOCK_ERR_REPORT; | |
213 | } else { | |
214 | error_report("'%s' invalid %s error action", | |
215 | buf, is_read ? "read" : "write"); | |
216 | return -1; | |
217 | } | |
218 | } | |
219 | ||
220 | DriveInfo *drive_init(QemuOpts *opts, int default_to_scsi) | |
221 | { | |
222 | const char *buf; | |
223 | const char *file = NULL; | |
224 | char devname[128]; | |
225 | const char *serial; | |
226 | const char *mediastr = ""; | |
227 | BlockInterfaceType type; | |
228 | enum { MEDIA_DISK, MEDIA_CDROM } media; | |
229 | int bus_id, unit_id; | |
230 | int cyls, heads, secs, translation; | |
231 | BlockDriver *drv = NULL; | |
232 | int max_devs; | |
233 | int index; | |
234 | int ro = 0; | |
235 | int bdrv_flags = 0; | |
236 | int on_read_error, on_write_error; | |
237 | const char *devaddr; | |
238 | DriveInfo *dinfo; | |
239 | int snapshot = 0; | |
240 | int ret; | |
241 | ||
242 | translation = BIOS_ATA_TRANSLATION_AUTO; | |
243 | media = MEDIA_DISK; | |
244 | ||
245 | /* extract parameters */ | |
246 | bus_id = qemu_opt_get_number(opts, "bus", 0); | |
247 | unit_id = qemu_opt_get_number(opts, "unit", -1); | |
248 | index = qemu_opt_get_number(opts, "index", -1); | |
249 | ||
250 | cyls = qemu_opt_get_number(opts, "cyls", 0); | |
251 | heads = qemu_opt_get_number(opts, "heads", 0); | |
252 | secs = qemu_opt_get_number(opts, "secs", 0); | |
253 | ||
254 | snapshot = qemu_opt_get_bool(opts, "snapshot", 0); | |
255 | ro = qemu_opt_get_bool(opts, "readonly", 0); | |
256 | ||
257 | file = qemu_opt_get(opts, "file"); | |
258 | serial = qemu_opt_get(opts, "serial"); | |
259 | ||
260 | if ((buf = qemu_opt_get(opts, "if")) != NULL) { | |
261 | pstrcpy(devname, sizeof(devname), buf); | |
262 | for (type = 0; type < IF_COUNT && strcmp(buf, if_name[type]); type++) | |
263 | ; | |
264 | if (type == IF_COUNT) { | |
265 | error_report("unsupported bus type '%s'", buf); | |
266 | return NULL; | |
267 | } | |
268 | } else { | |
269 | type = default_to_scsi ? IF_SCSI : IF_IDE; | |
270 | pstrcpy(devname, sizeof(devname), if_name[type]); | |
271 | } | |
272 | ||
273 | max_devs = if_max_devs[type]; | |
274 | ||
275 | if (cyls || heads || secs) { | |
276 | if (cyls < 1 || (type == IF_IDE && cyls > 16383)) { | |
277 | error_report("invalid physical cyls number"); | |
278 | return NULL; | |
279 | } | |
280 | if (heads < 1 || (type == IF_IDE && heads > 16)) { | |
281 | error_report("invalid physical heads number"); | |
282 | return NULL; | |
283 | } | |
284 | if (secs < 1 || (type == IF_IDE && secs > 63)) { | |
285 | error_report("invalid physical secs number"); | |
286 | return NULL; | |
287 | } | |
288 | } | |
289 | ||
290 | if ((buf = qemu_opt_get(opts, "trans")) != NULL) { | |
291 | if (!cyls) { | |
292 | error_report("'%s' trans must be used with cyls, heads and secs", | |
293 | buf); | |
294 | return NULL; | |
295 | } | |
296 | if (!strcmp(buf, "none")) | |
297 | translation = BIOS_ATA_TRANSLATION_NONE; | |
298 | else if (!strcmp(buf, "lba")) | |
299 | translation = BIOS_ATA_TRANSLATION_LBA; | |
300 | else if (!strcmp(buf, "auto")) | |
301 | translation = BIOS_ATA_TRANSLATION_AUTO; | |
302 | else { | |
303 | error_report("'%s' invalid translation type", buf); | |
304 | return NULL; | |
305 | } | |
306 | } | |
307 | ||
308 | if ((buf = qemu_opt_get(opts, "media")) != NULL) { | |
309 | if (!strcmp(buf, "disk")) { | |
310 | media = MEDIA_DISK; | |
311 | } else if (!strcmp(buf, "cdrom")) { | |
312 | if (cyls || secs || heads) { | |
313 | error_report("'%s' invalid physical CHS format", buf); | |
314 | return NULL; | |
315 | } | |
316 | media = MEDIA_CDROM; | |
317 | } else { | |
318 | error_report("'%s' invalid media", buf); | |
319 | return NULL; | |
320 | } | |
321 | } | |
322 | ||
323 | if ((buf = qemu_opt_get(opts, "cache")) != NULL) { | |
324 | if (!strcmp(buf, "off") || !strcmp(buf, "none")) { | |
325 | bdrv_flags |= BDRV_O_NOCACHE | BDRV_O_CACHE_WB; | |
326 | } else if (!strcmp(buf, "writeback")) { | |
327 | bdrv_flags |= BDRV_O_CACHE_WB; | |
328 | } else if (!strcmp(buf, "unsafe")) { | |
329 | bdrv_flags |= BDRV_O_CACHE_WB; | |
330 | bdrv_flags |= BDRV_O_NO_FLUSH; | |
331 | } else if (!strcmp(buf, "writethrough")) { | |
332 | /* this is the default */ | |
333 | } else { | |
334 | error_report("invalid cache option"); | |
335 | return NULL; | |
336 | } | |
337 | } | |
338 | ||
339 | #ifdef CONFIG_LINUX_AIO | |
340 | if ((buf = qemu_opt_get(opts, "aio")) != NULL) { | |
341 | if (!strcmp(buf, "native")) { | |
342 | bdrv_flags |= BDRV_O_NATIVE_AIO; | |
343 | } else if (!strcmp(buf, "threads")) { | |
344 | /* this is the default */ | |
345 | } else { | |
346 | error_report("invalid aio option"); | |
347 | return NULL; | |
348 | } | |
349 | } | |
350 | #endif | |
351 | ||
352 | if ((buf = qemu_opt_get(opts, "format")) != NULL) { | |
353 | if (strcmp(buf, "?") == 0) { | |
354 | error_printf("Supported formats:"); | |
355 | bdrv_iterate_format(bdrv_format_print, NULL); | |
356 | error_printf("\n"); | |
357 | return NULL; | |
358 | } | |
359 | drv = bdrv_find_whitelisted_format(buf); | |
360 | if (!drv) { | |
361 | error_report("'%s' invalid format", buf); | |
362 | return NULL; | |
363 | } | |
364 | } | |
365 | ||
366 | on_write_error = BLOCK_ERR_STOP_ENOSPC; | |
367 | if ((buf = qemu_opt_get(opts, "werror")) != NULL) { | |
368 | if (type != IF_IDE && type != IF_SCSI && type != IF_VIRTIO && type != IF_NONE) { | |
369 | error_report("werror is not supported by this bus type"); | |
370 | return NULL; | |
371 | } | |
372 | ||
373 | on_write_error = parse_block_error_action(buf, 0); | |
374 | if (on_write_error < 0) { | |
375 | return NULL; | |
376 | } | |
377 | } | |
378 | ||
379 | on_read_error = BLOCK_ERR_REPORT; | |
380 | if ((buf = qemu_opt_get(opts, "rerror")) != NULL) { | |
381 | if (type != IF_IDE && type != IF_VIRTIO && type != IF_SCSI && type != IF_NONE) { | |
382 | error_report("rerror is not supported by this bus type"); | |
383 | return NULL; | |
384 | } | |
385 | ||
386 | on_read_error = parse_block_error_action(buf, 1); | |
387 | if (on_read_error < 0) { | |
388 | return NULL; | |
389 | } | |
390 | } | |
391 | ||
392 | if ((devaddr = qemu_opt_get(opts, "addr")) != NULL) { | |
393 | if (type != IF_VIRTIO) { | |
394 | error_report("addr is not supported by this bus type"); | |
395 | return NULL; | |
396 | } | |
397 | } | |
398 | ||
399 | /* compute bus and unit according index */ | |
400 | ||
401 | if (index != -1) { | |
402 | if (bus_id != 0 || unit_id != -1) { | |
403 | error_report("index cannot be used with bus and unit"); | |
404 | return NULL; | |
405 | } | |
406 | bus_id = drive_index_to_bus_id(type, index); | |
407 | unit_id = drive_index_to_unit_id(type, index); | |
408 | } | |
409 | ||
410 | /* if user doesn't specify a unit_id, | |
411 | * try to find the first free | |
412 | */ | |
413 | ||
414 | if (unit_id == -1) { | |
415 | unit_id = 0; | |
416 | while (drive_get(type, bus_id, unit_id) != NULL) { | |
417 | unit_id++; | |
418 | if (max_devs && unit_id >= max_devs) { | |
419 | unit_id -= max_devs; | |
420 | bus_id++; | |
421 | } | |
422 | } | |
423 | } | |
424 | ||
425 | /* check unit id */ | |
426 | ||
427 | if (max_devs && unit_id >= max_devs) { | |
428 | error_report("unit %d too big (max is %d)", | |
429 | unit_id, max_devs - 1); | |
430 | return NULL; | |
431 | } | |
432 | ||
433 | /* | |
434 | * catch multiple definitions | |
435 | */ | |
436 | ||
437 | if (drive_get(type, bus_id, unit_id) != NULL) { | |
438 | error_report("drive with bus=%d, unit=%d (index=%d) exists", | |
439 | bus_id, unit_id, index); | |
440 | return NULL; | |
441 | } | |
442 | ||
443 | /* init */ | |
444 | ||
445 | dinfo = qemu_mallocz(sizeof(*dinfo)); | |
446 | if ((buf = qemu_opts_id(opts)) != NULL) { | |
447 | dinfo->id = qemu_strdup(buf); | |
448 | } else { | |
449 | /* no id supplied -> create one */ | |
450 | dinfo->id = qemu_mallocz(32); | |
451 | if (type == IF_IDE || type == IF_SCSI) | |
452 | mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd"; | |
453 | if (max_devs) | |
454 | snprintf(dinfo->id, 32, "%s%i%s%i", | |
455 | devname, bus_id, mediastr, unit_id); | |
456 | else | |
457 | snprintf(dinfo->id, 32, "%s%s%i", | |
458 | devname, mediastr, unit_id); | |
459 | } | |
460 | dinfo->bdrv = bdrv_new(dinfo->id); | |
461 | dinfo->devaddr = devaddr; | |
462 | dinfo->type = type; | |
463 | dinfo->bus = bus_id; | |
464 | dinfo->unit = unit_id; | |
465 | dinfo->opts = opts; | |
466 | dinfo->refcount = 1; | |
467 | if (serial) | |
468 | strncpy(dinfo->serial, serial, sizeof(dinfo->serial) - 1); | |
469 | QTAILQ_INSERT_TAIL(&drives, dinfo, next); | |
470 | ||
471 | bdrv_set_on_error(dinfo->bdrv, on_read_error, on_write_error); | |
472 | ||
473 | switch(type) { | |
474 | case IF_IDE: | |
475 | case IF_SCSI: | |
476 | case IF_XEN: | |
477 | case IF_NONE: | |
478 | switch(media) { | |
479 | case MEDIA_DISK: | |
480 | if (cyls != 0) { | |
481 | bdrv_set_geometry_hint(dinfo->bdrv, cyls, heads, secs); | |
482 | bdrv_set_translation_hint(dinfo->bdrv, translation); | |
483 | } | |
484 | break; | |
485 | case MEDIA_CDROM: | |
486 | bdrv_set_removable(dinfo->bdrv, 1); | |
487 | dinfo->media_cd = 1; | |
488 | break; | |
489 | } | |
490 | break; | |
491 | case IF_SD: | |
492 | /* FIXME: This isn't really a floppy, but it's a reasonable | |
493 | approximation. */ | |
494 | case IF_FLOPPY: | |
495 | bdrv_set_removable(dinfo->bdrv, 1); | |
496 | break; | |
497 | case IF_PFLASH: | |
498 | case IF_MTD: | |
499 | break; | |
500 | case IF_VIRTIO: | |
501 | /* add virtio block device */ | |
502 | opts = qemu_opts_create(qemu_find_opts("device"), NULL, 0); | |
503 | qemu_opt_set(opts, "driver", "virtio-blk"); | |
504 | qemu_opt_set(opts, "drive", dinfo->id); | |
505 | if (devaddr) | |
506 | qemu_opt_set(opts, "addr", devaddr); | |
507 | break; | |
508 | default: | |
509 | abort(); | |
510 | } | |
511 | if (!file || !*file) { | |
512 | return dinfo; | |
513 | } | |
514 | if (snapshot) { | |
515 | /* always use cache=unsafe with snapshot */ | |
516 | bdrv_flags &= ~BDRV_O_CACHE_MASK; | |
517 | bdrv_flags |= (BDRV_O_SNAPSHOT|BDRV_O_CACHE_WB|BDRV_O_NO_FLUSH); | |
518 | } | |
519 | ||
520 | if (media == MEDIA_CDROM) { | |
521 | /* CDROM is fine for any interface, don't check. */ | |
522 | ro = 1; | |
523 | } else if (ro == 1) { | |
524 | if (type != IF_SCSI && type != IF_VIRTIO && type != IF_FLOPPY && type != IF_NONE) { | |
525 | error_report("readonly not supported by this bus type"); | |
526 | goto err; | |
527 | } | |
528 | } | |
529 | ||
530 | bdrv_flags |= ro ? 0 : BDRV_O_RDWR; | |
531 | ||
532 | ret = bdrv_open(dinfo->bdrv, file, bdrv_flags, drv); | |
533 | if (ret < 0) { | |
534 | error_report("could not open disk image %s: %s", | |
535 | file, strerror(-ret)); | |
536 | goto err; | |
537 | } | |
538 | ||
539 | if (bdrv_key_required(dinfo->bdrv)) | |
540 | autostart = 0; | |
541 | return dinfo; | |
542 | ||
543 | err: | |
544 | bdrv_delete(dinfo->bdrv); | |
545 | qemu_free(dinfo->id); | |
546 | QTAILQ_REMOVE(&drives, dinfo, next); | |
547 | qemu_free(dinfo); | |
548 | return NULL; | |
549 | } | |
550 | ||
551 | void do_commit(Monitor *mon, const QDict *qdict) | |
552 | { | |
553 | const char *device = qdict_get_str(qdict, "device"); | |
554 | BlockDriverState *bs; | |
555 | ||
556 | if (!strcmp(device, "all")) { | |
557 | bdrv_commit_all(); | |
558 | } else { | |
559 | bs = bdrv_find(device); | |
560 | if (!bs) { | |
561 | qerror_report(QERR_DEVICE_NOT_FOUND, device); | |
562 | return; | |
563 | } | |
564 | bdrv_commit(bs); | |
565 | } | |
566 | } | |
567 | ||
568 | int do_snapshot_blkdev(Monitor *mon, const QDict *qdict, QObject **ret_data) | |
569 | { | |
570 | const char *device = qdict_get_str(qdict, "device"); | |
571 | const char *filename = qdict_get_try_str(qdict, "snapshot_file"); | |
572 | const char *format = qdict_get_try_str(qdict, "format"); | |
573 | BlockDriverState *bs; | |
574 | BlockDriver *drv, *old_drv, *proto_drv; | |
575 | int ret = 0; | |
576 | int flags; | |
577 | char old_filename[1024]; | |
578 | ||
579 | if (!filename) { | |
580 | qerror_report(QERR_MISSING_PARAMETER, "snapshot_file"); | |
581 | ret = -1; | |
582 | goto out; | |
583 | } | |
584 | ||
585 | bs = bdrv_find(device); | |
586 | if (!bs) { | |
587 | qerror_report(QERR_DEVICE_NOT_FOUND, device); | |
588 | ret = -1; | |
589 | goto out; | |
590 | } | |
591 | ||
592 | pstrcpy(old_filename, sizeof(old_filename), bs->filename); | |
593 | ||
594 | old_drv = bs->drv; | |
595 | flags = bs->open_flags; | |
596 | ||
597 | if (!format) { | |
598 | format = "qcow2"; | |
599 | } | |
600 | ||
601 | drv = bdrv_find_format(format); | |
602 | if (!drv) { | |
603 | qerror_report(QERR_INVALID_BLOCK_FORMAT, format); | |
604 | ret = -1; | |
605 | goto out; | |
606 | } | |
607 | ||
608 | proto_drv = bdrv_find_protocol(filename); | |
609 | if (!proto_drv) { | |
610 | qerror_report(QERR_INVALID_BLOCK_FORMAT, format); | |
611 | ret = -1; | |
612 | goto out; | |
613 | } | |
614 | ||
615 | ret = bdrv_img_create(filename, format, bs->filename, | |
616 | bs->drv->format_name, NULL, -1, flags); | |
617 | if (ret) { | |
618 | goto out; | |
619 | } | |
620 | ||
621 | qemu_aio_flush(); | |
622 | bdrv_flush(bs); | |
623 | ||
624 | bdrv_close(bs); | |
625 | ret = bdrv_open(bs, filename, flags, drv); | |
626 | /* | |
627 | * If reopening the image file we just created fails, fall back | |
628 | * and try to re-open the original image. If that fails too, we | |
629 | * are in serious trouble. | |
630 | */ | |
631 | if (ret != 0) { | |
632 | ret = bdrv_open(bs, old_filename, flags, old_drv); | |
633 | if (ret != 0) { | |
634 | qerror_report(QERR_OPEN_FILE_FAILED, old_filename); | |
635 | } else { | |
636 | qerror_report(QERR_OPEN_FILE_FAILED, filename); | |
637 | } | |
638 | } | |
639 | out: | |
640 | if (ret) { | |
641 | ret = -1; | |
642 | } | |
643 | ||
644 | return ret; | |
645 | } | |
646 | ||
647 | static int eject_device(Monitor *mon, BlockDriverState *bs, int force) | |
648 | { | |
649 | if (!force) { | |
650 | if (!bdrv_is_removable(bs)) { | |
651 | qerror_report(QERR_DEVICE_NOT_REMOVABLE, | |
652 | bdrv_get_device_name(bs)); | |
653 | return -1; | |
654 | } | |
655 | if (bdrv_is_locked(bs)) { | |
656 | qerror_report(QERR_DEVICE_LOCKED, bdrv_get_device_name(bs)); | |
657 | return -1; | |
658 | } | |
659 | } | |
660 | bdrv_close(bs); | |
661 | return 0; | |
662 | } | |
663 | ||
664 | int do_eject(Monitor *mon, const QDict *qdict, QObject **ret_data) | |
665 | { | |
666 | BlockDriverState *bs; | |
667 | int force = qdict_get_try_bool(qdict, "force", 0); | |
668 | const char *filename = qdict_get_str(qdict, "device"); | |
669 | ||
670 | bs = bdrv_find(filename); | |
671 | if (!bs) { | |
672 | qerror_report(QERR_DEVICE_NOT_FOUND, filename); | |
673 | return -1; | |
674 | } | |
675 | return eject_device(mon, bs, force); | |
676 | } | |
677 | ||
678 | int do_block_set_passwd(Monitor *mon, const QDict *qdict, | |
679 | QObject **ret_data) | |
680 | { | |
681 | BlockDriverState *bs; | |
682 | int err; | |
683 | ||
684 | bs = bdrv_find(qdict_get_str(qdict, "device")); | |
685 | if (!bs) { | |
686 | qerror_report(QERR_DEVICE_NOT_FOUND, qdict_get_str(qdict, "device")); | |
687 | return -1; | |
688 | } | |
689 | ||
690 | err = bdrv_set_key(bs, qdict_get_str(qdict, "password")); | |
691 | if (err == -EINVAL) { | |
692 | qerror_report(QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs)); | |
693 | return -1; | |
694 | } else if (err < 0) { | |
695 | qerror_report(QERR_INVALID_PASSWORD); | |
696 | return -1; | |
697 | } | |
698 | ||
699 | return 0; | |
700 | } | |
701 | ||
702 | int do_change_block(Monitor *mon, const char *device, | |
703 | const char *filename, const char *fmt) | |
704 | { | |
705 | BlockDriverState *bs; | |
706 | BlockDriver *drv = NULL; | |
707 | int bdrv_flags; | |
708 | ||
709 | bs = bdrv_find(device); | |
710 | if (!bs) { | |
711 | qerror_report(QERR_DEVICE_NOT_FOUND, device); | |
712 | return -1; | |
713 | } | |
714 | if (fmt) { | |
715 | drv = bdrv_find_whitelisted_format(fmt); | |
716 | if (!drv) { | |
717 | qerror_report(QERR_INVALID_BLOCK_FORMAT, fmt); | |
718 | return -1; | |
719 | } | |
720 | } | |
721 | if (eject_device(mon, bs, 0) < 0) { | |
722 | return -1; | |
723 | } | |
724 | bdrv_flags = bdrv_is_read_only(bs) ? 0 : BDRV_O_RDWR; | |
725 | bdrv_flags |= bdrv_is_snapshot(bs) ? BDRV_O_SNAPSHOT : 0; | |
726 | if (bdrv_open(bs, filename, bdrv_flags, drv) < 0) { | |
727 | qerror_report(QERR_OPEN_FILE_FAILED, filename); | |
728 | return -1; | |
729 | } | |
730 | return monitor_read_bdrv_key_start(mon, bs, NULL, NULL); | |
731 | } | |
732 | ||
733 | int do_drive_del(Monitor *mon, const QDict *qdict, QObject **ret_data) | |
734 | { | |
735 | const char *id = qdict_get_str(qdict, "id"); | |
736 | BlockDriverState *bs; | |
737 | ||
738 | bs = bdrv_find(id); | |
739 | if (!bs) { | |
740 | qerror_report(QERR_DEVICE_NOT_FOUND, id); | |
741 | return -1; | |
742 | } | |
743 | if (bdrv_in_use(bs)) { | |
744 | qerror_report(QERR_DEVICE_IN_USE, id); | |
745 | return -1; | |
746 | } | |
747 | ||
748 | /* quiesce block driver; prevent further io */ | |
749 | qemu_aio_flush(); | |
750 | bdrv_flush(bs); | |
751 | bdrv_close(bs); | |
752 | ||
753 | /* if we have a device associated with this BlockDriverState (bs->peer) | |
754 | * then we need to make the drive anonymous until the device | |
755 | * can be removed. If this is a drive with no device backing | |
756 | * then we can just get rid of the block driver state right here. | |
757 | */ | |
758 | if (bs->peer) { | |
759 | bdrv_make_anon(bs); | |
760 | } else { | |
761 | drive_uninit(drive_get_by_blockdev(bs)); | |
762 | } | |
763 | ||
764 | return 0; | |
765 | } | |
766 | ||
767 | /* | |
768 | * XXX: replace the QERR_UNDEFINED_ERROR errors with real values once the | |
769 | * existing QERR_ macro mess is cleaned up. A good example for better | |
770 | * error reports can be found in the qemu-img resize code. | |
771 | */ | |
772 | int do_block_resize(Monitor *mon, const QDict *qdict, QObject **ret_data) | |
773 | { | |
774 | const char *device = qdict_get_str(qdict, "device"); | |
775 | int64_t size = qdict_get_int(qdict, "size"); | |
776 | BlockDriverState *bs; | |
777 | ||
778 | bs = bdrv_find(device); | |
779 | if (!bs) { | |
780 | qerror_report(QERR_DEVICE_NOT_FOUND, device); | |
781 | return -1; | |
782 | } | |
783 | ||
784 | if (size < 0) { | |
785 | qerror_report(QERR_UNDEFINED_ERROR); | |
786 | return -1; | |
787 | } | |
788 | ||
789 | if (bdrv_truncate(bs, size)) { | |
790 | qerror_report(QERR_UNDEFINED_ERROR); | |
791 | return -1; | |
792 | } | |
793 | ||
794 | return 0; | |
795 | } |