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
18 static QTAILQ_HEAD(drivelist, DriveInfo) drives = QTAILQ_HEAD_INITIALIZER(drives);
19
20 /*
21 * We automatically delete the drive when a device using it gets
22 * unplugged. Questionable feature, but we can't just drop it.
23 * Device models call blockdev_mark_auto_del() to schedule the
24 * automatic deletion, and generic qdev code calls blockdev_auto_del()
25 * when deletion is actually safe.
26 */
blockdev_mark_auto_del(BlockDriverState * bs)27 void blockdev_mark_auto_del(BlockDriverState *bs)
28 {
29 DriveInfo *dinfo = drive_get_by_blockdev(bs);
30
31 dinfo->auto_del = 1;
32 }
33
blockdev_auto_del(BlockDriverState * bs)34 void blockdev_auto_del(BlockDriverState *bs)
35 {
36 DriveInfo *dinfo = drive_get_by_blockdev(bs);
37
38 if (dinfo->auto_del) {
39 drive_uninit(dinfo);
40 }
41 }
42
drive_add(const char * file,const char * fmt,...)43 QemuOpts *drive_add(const char *file, const char *fmt, ...)
44 {
45 va_list ap;
46 char optstr[1024];
47 QemuOpts *opts;
48
49 va_start(ap, fmt);
50 vsnprintf(optstr, sizeof(optstr), fmt, ap);
51 va_end(ap);
52
53 opts = qemu_opts_parse(qemu_find_opts("drive"), optstr, 0);
54 if (!opts) {
55 return NULL;
56 }
57 if (file)
58 qemu_opt_set(opts, "file", file);
59 return opts;
60 }
61
drive_get(BlockInterfaceType type,int bus,int unit)62 DriveInfo *drive_get(BlockInterfaceType type, int bus, int unit)
63 {
64 DriveInfo *dinfo;
65
66 /* seek interface, bus and unit */
67
68 QTAILQ_FOREACH(dinfo, &drives, next) {
69 if (dinfo->type == type &&
70 dinfo->bus == bus &&
71 dinfo->unit == unit)
72 return dinfo;
73 }
74
75 return NULL;
76 }
77
drive_get_max_bus(BlockInterfaceType type)78 int drive_get_max_bus(BlockInterfaceType type)
79 {
80 int max_bus;
81 DriveInfo *dinfo;
82
83 max_bus = -1;
84 QTAILQ_FOREACH(dinfo, &drives, next) {
85 if(dinfo->type == type &&
86 dinfo->bus > max_bus)
87 max_bus = dinfo->bus;
88 }
89 return max_bus;
90 }
91
drive_get_by_blockdev(BlockDriverState * bs)92 DriveInfo *drive_get_by_blockdev(BlockDriverState *bs)
93 {
94 DriveInfo *dinfo;
95
96 QTAILQ_FOREACH(dinfo, &drives, next) {
97 if (dinfo->bdrv == bs) {
98 return dinfo;
99 }
100 }
101 return NULL;
102 }
103
bdrv_format_print(void * opaque,const char * name)104 static void bdrv_format_print(void *opaque, const char *name)
105 {
106 fprintf(stderr, " %s", name);
107 }
108
drive_uninit(DriveInfo * dinfo)109 void drive_uninit(DriveInfo *dinfo)
110 {
111 qemu_opts_del(dinfo->opts);
112 bdrv_delete(dinfo->bdrv);
113 QTAILQ_REMOVE(&drives, dinfo, next);
114 qemu_free(dinfo);
115 }
116
parse_block_error_action(const char * buf,int is_read)117 static int parse_block_error_action(const char *buf, int is_read)
118 {
119 if (!strcmp(buf, "ignore")) {
120 return BLOCK_ERR_IGNORE;
121 } else if (!is_read && !strcmp(buf, "enospc")) {
122 return BLOCK_ERR_STOP_ENOSPC;
123 } else if (!strcmp(buf, "stop")) {
124 return BLOCK_ERR_STOP_ANY;
125 } else if (!strcmp(buf, "report")) {
126 return BLOCK_ERR_REPORT;
127 } else {
128 fprintf(stderr, "qemu: '%s' invalid %s error action\n",
129 buf, is_read ? "read" : "write");
130 return -1;
131 }
132 }
133
drive_init(QemuOpts * opts,int default_to_scsi,int * fatal_error)134 DriveInfo *drive_init(QemuOpts *opts, int default_to_scsi, int *fatal_error)
135 {
136 const char *buf;
137 const char *file = NULL;
138 char devname[128];
139 const char *serial;
140 const char *mediastr = "";
141 BlockInterfaceType type;
142 enum { MEDIA_DISK, MEDIA_CDROM } media;
143 int bus_id, unit_id;
144 int cyls, heads, secs, translation;
145 BlockDriver *drv = NULL;
146 int max_devs;
147 int index;
148 int ro = 0;
149 int bdrv_flags = 0;
150 int on_read_error, on_write_error;
151 const char *devaddr;
152 DriveInfo *dinfo;
153 int snapshot = 0;
154 int ret;
155
156 *fatal_error = 1;
157
158 translation = BIOS_ATA_TRANSLATION_AUTO;
159
160 if (default_to_scsi) {
161 type = IF_SCSI;
162 max_devs = MAX_SCSI_DEVS;
163 pstrcpy(devname, sizeof(devname), "scsi");
164 } else {
165 type = IF_IDE;
166 max_devs = MAX_IDE_DEVS;
167 pstrcpy(devname, sizeof(devname), "ide");
168 }
169 media = MEDIA_DISK;
170
171 /* extract parameters */
172 bus_id = qemu_opt_get_number(opts, "bus", 0);
173 unit_id = qemu_opt_get_number(opts, "unit", -1);
174 index = qemu_opt_get_number(opts, "index", -1);
175
176 cyls = qemu_opt_get_number(opts, "cyls", 0);
177 heads = qemu_opt_get_number(opts, "heads", 0);
178 secs = qemu_opt_get_number(opts, "secs", 0);
179
180 snapshot = qemu_opt_get_bool(opts, "snapshot", 0);
181 ro = qemu_opt_get_bool(opts, "readonly", 0);
182
183 file = qemu_opt_get(opts, "file");
184 serial = qemu_opt_get(opts, "serial");
185
186 if ((buf = qemu_opt_get(opts, "if")) != NULL) {
187 pstrcpy(devname, sizeof(devname), buf);
188 if (!strcmp(buf, "ide")) {
189 type = IF_IDE;
190 max_devs = MAX_IDE_DEVS;
191 } else if (!strcmp(buf, "scsi")) {
192 type = IF_SCSI;
193 max_devs = MAX_SCSI_DEVS;
194 } else if (!strcmp(buf, "floppy")) {
195 type = IF_FLOPPY;
196 max_devs = 0;
197 } else if (!strcmp(buf, "pflash")) {
198 type = IF_PFLASH;
199 max_devs = 0;
200 } else if (!strcmp(buf, "mtd")) {
201 type = IF_MTD;
202 max_devs = 0;
203 } else if (!strcmp(buf, "sd")) {
204 type = IF_SD;
205 max_devs = 0;
206 } else if (!strcmp(buf, "virtio")) {
207 type = IF_VIRTIO;
208 max_devs = 0;
209 } else if (!strcmp(buf, "xen")) {
210 type = IF_XEN;
211 max_devs = 0;
212 } else if (!strcmp(buf, "none")) {
213 type = IF_NONE;
214 max_devs = 0;
215 } else {
216 fprintf(stderr, "qemu: unsupported bus type '%s'\n", buf);
217 return NULL;
218 }
219 }
220
221 if (cyls || heads || secs) {
222 if (cyls < 1 || (type == IF_IDE && cyls > 16383)) {
223 fprintf(stderr, "qemu: '%s' invalid physical cyls number\n", buf);
224 return NULL;
225 }
226 if (heads < 1 || (type == IF_IDE && heads > 16)) {
227 fprintf(stderr, "qemu: '%s' invalid physical heads number\n", buf);
228 return NULL;
229 }
230 if (secs < 1 || (type == IF_IDE && secs > 63)) {
231 fprintf(stderr, "qemu: '%s' invalid physical secs number\n", buf);
232 return NULL;
233 }
234 }
235
236 if ((buf = qemu_opt_get(opts, "trans")) != NULL) {
237 if (!cyls) {
238 fprintf(stderr,
239 "qemu: '%s' trans must be used with cyls,heads and secs\n",
240 buf);
241 return NULL;
242 }
243 if (!strcmp(buf, "none"))
244 translation = BIOS_ATA_TRANSLATION_NONE;
245 else if (!strcmp(buf, "lba"))
246 translation = BIOS_ATA_TRANSLATION_LBA;
247 else if (!strcmp(buf, "auto"))
248 translation = BIOS_ATA_TRANSLATION_AUTO;
249 else {
250 fprintf(stderr, "qemu: '%s' invalid translation type\n", buf);
251 return NULL;
252 }
253 }
254
255 if ((buf = qemu_opt_get(opts, "media")) != NULL) {
256 if (!strcmp(buf, "disk")) {
257 media = MEDIA_DISK;
258 } else if (!strcmp(buf, "cdrom")) {
259 if (cyls || secs || heads) {
260 fprintf(stderr,
261 "qemu: '%s' invalid physical CHS format\n", buf);
262 return NULL;
263 }
264 media = MEDIA_CDROM;
265 } else {
266 fprintf(stderr, "qemu: '%s' invalid media\n", buf);
267 return NULL;
268 }
269 }
270
271 if ((buf = qemu_opt_get(opts, "cache")) != NULL) {
272 if (!strcmp(buf, "off") || !strcmp(buf, "none")) {
273 bdrv_flags |= BDRV_O_NOCACHE;
274 } else if (!strcmp(buf, "writeback")) {
275 bdrv_flags |= BDRV_O_CACHE_WB;
276 } else if (!strcmp(buf, "unsafe")) {
277 bdrv_flags |= BDRV_O_CACHE_WB;
278 bdrv_flags |= BDRV_O_NO_FLUSH;
279 } else if (!strcmp(buf, "writethrough")) {
280 /* this is the default */
281 } else {
282 fprintf(stderr, "qemu: invalid cache option\n");
283 return NULL;
284 }
285 }
286
287 #ifdef CONFIG_LINUX_AIO
288 if ((buf = qemu_opt_get(opts, "aio")) != NULL) {
289 if (!strcmp(buf, "native")) {
290 bdrv_flags |= BDRV_O_NATIVE_AIO;
291 } else if (!strcmp(buf, "threads")) {
292 /* this is the default */
293 } else {
294 fprintf(stderr, "qemu: invalid aio option\n");
295 return NULL;
296 }
297 }
298 #endif
299
300 if ((buf = qemu_opt_get(opts, "format")) != NULL) {
301 if (strcmp(buf, "?") == 0) {
302 fprintf(stderr, "qemu: Supported formats:");
303 bdrv_iterate_format(bdrv_format_print, NULL);
304 fprintf(stderr, "\n");
305 return NULL;
306 }
307 drv = bdrv_find_whitelisted_format(buf);
308 if (!drv) {
309 fprintf(stderr, "qemu: '%s' invalid format\n", buf);
310 return NULL;
311 }
312 }
313
314 on_write_error = BLOCK_ERR_STOP_ENOSPC;
315 if ((buf = qemu_opt_get(opts, "werror")) != NULL) {
316 if (type != IF_IDE && type != IF_SCSI && type != IF_VIRTIO && type != IF_NONE) {
317 fprintf(stderr, "werror is no supported by this format\n");
318 return NULL;
319 }
320
321 on_write_error = parse_block_error_action(buf, 0);
322 if (on_write_error < 0) {
323 return NULL;
324 }
325 }
326
327 on_read_error = BLOCK_ERR_REPORT;
328 if ((buf = qemu_opt_get(opts, "rerror")) != NULL) {
329 if (type != IF_IDE && type != IF_VIRTIO && type != IF_NONE) {
330 fprintf(stderr, "rerror is no supported by this format\n");
331 return NULL;
332 }
333
334 on_read_error = parse_block_error_action(buf, 1);
335 if (on_read_error < 0) {
336 return NULL;
337 }
338 }
339
340 if ((devaddr = qemu_opt_get(opts, "addr")) != NULL) {
341 if (type != IF_VIRTIO) {
342 fprintf(stderr, "addr is not supported\n");
343 return NULL;
344 }
345 }
346
347 /* compute bus and unit according index */
348
349 if (index != -1) {
350 if (bus_id != 0 || unit_id != -1) {
351 fprintf(stderr,
352 "qemu: index cannot be used with bus and unit\n");
353 return NULL;
354 }
355 if (max_devs == 0)
356 {
357 unit_id = index;
358 bus_id = 0;
359 } else {
360 unit_id = index % max_devs;
361 bus_id = index / max_devs;
362 }
363 }
364
365 /* if user doesn't specify a unit_id,
366 * try to find the first free
367 */
368
369 if (unit_id == -1) {
370 unit_id = 0;
371 while (drive_get(type, bus_id, unit_id) != NULL) {
372 unit_id++;
373 if (max_devs && unit_id >= max_devs) {
374 unit_id -= max_devs;
375 bus_id++;
376 }
377 }
378 }
379
380 /* check unit id */
381
382 if (max_devs && unit_id >= max_devs) {
383 fprintf(stderr, "qemu: unit %d too big (max is %d)\n",
384 unit_id, max_devs - 1);
385 return NULL;
386 }
387
388 /*
389 * ignore multiple definitions
390 */
391
392 if (drive_get(type, bus_id, unit_id) != NULL) {
393 *fatal_error = 0;
394 return NULL;
395 }
396
397 /* init */
398
399 dinfo = qemu_mallocz(sizeof(*dinfo));
400 if ((buf = qemu_opts_id(opts)) != NULL) {
401 dinfo->id = qemu_strdup(buf);
402 } else {
403 /* no id supplied -> create one */
404 dinfo->id = qemu_mallocz(32);
405 if (type == IF_IDE || type == IF_SCSI)
406 mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd";
407 if (max_devs)
408 snprintf(dinfo->id, 32, "%s%i%s%i",
409 devname, bus_id, mediastr, unit_id);
410 else
411 snprintf(dinfo->id, 32, "%s%s%i",
412 devname, mediastr, unit_id);
413 }
414 dinfo->bdrv = bdrv_new(dinfo->id);
415 dinfo->devaddr = devaddr;
416 dinfo->type = type;
417 dinfo->bus = bus_id;
418 dinfo->unit = unit_id;
419 dinfo->opts = opts;
420 if (serial)
421 strncpy(dinfo->serial, serial, sizeof(dinfo->serial) - 1);
422 QTAILQ_INSERT_TAIL(&drives, dinfo, next);
423
424 bdrv_set_on_error(dinfo->bdrv, on_read_error, on_write_error);
425
426 switch(type) {
427 case IF_IDE:
428 case IF_SCSI:
429 case IF_XEN:
430 case IF_NONE:
431 switch(media) {
432 case MEDIA_DISK:
433 if (cyls != 0) {
434 bdrv_set_geometry_hint(dinfo->bdrv, cyls, heads, secs);
435 bdrv_set_translation_hint(dinfo->bdrv, translation);
436 }
437 break;
438 case MEDIA_CDROM:
439 bdrv_set_type_hint(dinfo->bdrv, BDRV_TYPE_CDROM);
440 break;
441 }
442 break;
443 case IF_SD:
444 /* FIXME: This isn't really a floppy, but it's a reasonable
445 approximation. */
446 case IF_FLOPPY:
447 bdrv_set_type_hint(dinfo->bdrv, BDRV_TYPE_FLOPPY);
448 break;
449 case IF_PFLASH:
450 case IF_MTD:
451 break;
452 case IF_VIRTIO:
453 /* add virtio block device */
454 opts = qemu_opts_create(qemu_find_opts("device"), NULL, 0);
455 qemu_opt_set(opts, "driver", "virtio-blk-pci");
456 qemu_opt_set(opts, "drive", dinfo->id);
457 if (devaddr)
458 qemu_opt_set(opts, "addr", devaddr);
459 break;
460 case IF_COUNT:
461 abort();
462 }
463 if (!file || !*file) {
464 *fatal_error = 0;
465 return NULL;
466 }
467 if (snapshot) {
468 /* always use cache=unsafe with snapshot */
469 bdrv_flags &= ~BDRV_O_CACHE_MASK;
470 bdrv_flags |= (BDRV_O_SNAPSHOT|BDRV_O_CACHE_WB|BDRV_O_NO_FLUSH);
471 }
472
473 if (media == MEDIA_CDROM) {
474 /* CDROM is fine for any interface, don't check. */
475 ro = 1;
476 } else if (ro == 1) {
477 if (type != IF_SCSI && type != IF_VIRTIO && type != IF_FLOPPY && type != IF_NONE) {
478 fprintf(stderr, "qemu: readonly flag not supported for drive with this interface\n");
479 return NULL;
480 }
481 }
482
483 bdrv_flags |= ro ? 0 : BDRV_O_RDWR;
484
485 ret = bdrv_open(dinfo->bdrv, file, bdrv_flags, drv);
486 if (ret < 0) {
487 fprintf(stderr, "qemu: could not open disk image %s: %s\n",
488 file, strerror(-ret));
489 return NULL;
490 }
491
492 if (bdrv_key_required(dinfo->bdrv))
493 autostart = 0;
494 *fatal_error = 0;
495 return dinfo;
496 }
497
do_commit(Monitor * mon,const QDict * qdict)498 void do_commit(Monitor *mon, const QDict *qdict)
499 {
500 const char *device = qdict_get_str(qdict, "device");
501 BlockDriverState *bs;
502
503 if (!strcmp(device, "all")) {
504 bdrv_commit_all();
505 } else {
506 bs = bdrv_find(device);
507 if (!bs) {
508 qerror_report(QERR_DEVICE_NOT_FOUND, device);
509 return;
510 }
511 bdrv_commit(bs);
512 }
513 }
514
eject_device(Monitor * mon,BlockDriverState * bs,int force)515 static int eject_device(Monitor *mon, BlockDriverState *bs, int force)
516 {
517 if (!force) {
518 if (!bdrv_is_removable(bs)) {
519 qerror_report(QERR_DEVICE_NOT_REMOVABLE,
520 bdrv_get_device_name(bs));
521 return -1;
522 }
523 if (bdrv_is_locked(bs)) {
524 qerror_report(QERR_DEVICE_LOCKED, bdrv_get_device_name(bs));
525 return -1;
526 }
527 }
528 bdrv_close(bs);
529 return 0;
530 }
531
do_eject(Monitor * mon,const QDict * qdict,QObject ** ret_data)532 int do_eject(Monitor *mon, const QDict *qdict, QObject **ret_data)
533 {
534 BlockDriverState *bs;
535 int force = qdict_get_try_bool(qdict, "force", 0);
536 const char *filename = qdict_get_str(qdict, "device");
537
538 bs = bdrv_find(filename);
539 if (!bs) {
540 qerror_report(QERR_DEVICE_NOT_FOUND, filename);
541 return -1;
542 }
543 return eject_device(mon, bs, force);
544 }
545
do_block_set_passwd(Monitor * mon,const QDict * qdict,QObject ** ret_data)546 int do_block_set_passwd(Monitor *mon, const QDict *qdict,
547 QObject **ret_data)
548 {
549 BlockDriverState *bs;
550 int err;
551
552 bs = bdrv_find(qdict_get_str(qdict, "device"));
553 if (!bs) {
554 qerror_report(QERR_DEVICE_NOT_FOUND, qdict_get_str(qdict, "device"));
555 return -1;
556 }
557
558 err = bdrv_set_key(bs, qdict_get_str(qdict, "password"));
559 if (err == -EINVAL) {
560 qerror_report(QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs));
561 return -1;
562 } else if (err < 0) {
563 qerror_report(QERR_INVALID_PASSWORD);
564 return -1;
565 }
566
567 return 0;
568 }
569
do_change_block(Monitor * mon,const char * device,const char * filename,const char * fmt)570 int do_change_block(Monitor *mon, const char *device,
571 const char *filename, const char *fmt)
572 {
573 BlockDriverState *bs;
574 BlockDriver *drv = NULL;
575 int bdrv_flags;
576
577 bs = bdrv_find(device);
578 if (!bs) {
579 qerror_report(QERR_DEVICE_NOT_FOUND, device);
580 return -1;
581 }
582 if (fmt) {
583 drv = bdrv_find_whitelisted_format(fmt);
584 if (!drv) {
585 qerror_report(QERR_INVALID_BLOCK_FORMAT, fmt);
586 return -1;
587 }
588 }
589 if (eject_device(mon, bs, 0) < 0) {
590 return -1;
591 }
592 bdrv_flags = bdrv_is_read_only(bs) ? 0 : BDRV_O_RDWR;
593 bdrv_flags |= bdrv_is_snapshot(bs) ? BDRV_O_SNAPSHOT : 0;
594 if (bdrv_open(bs, filename, bdrv_flags, drv) < 0) {
595 qerror_report(QERR_OPEN_FILE_FAILED, filename);
596 return -1;
597 }
598 return monitor_read_bdrv_key_start(mon, bs, NULL, NULL);
599 }
600