2 * QEMU host block devices
4 * Copyright (c) 2003-2008 Fabrice Bellard
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.
14 #include "qemu-option.h"
15 #include "qemu-config.h"
18 #include "block_int.h"
20 static QTAILQ_HEAD(drivelist, DriveInfo) drives = QTAILQ_HEAD_INITIALIZER(drives);
23 * We automatically delete the drive when a device using it gets
24 * unplugged. Questionable feature, but we can't just drop it.
25 * Device models call blockdev_mark_auto_del() to schedule the
26 * automatic deletion, and generic qdev code calls blockdev_auto_del()
27 * when deletion is actually safe.
29 void blockdev_mark_auto_del(BlockDriverState *bs)
31 DriveInfo *dinfo = drive_get_by_blockdev(bs);
36 void blockdev_auto_del(BlockDriverState *bs)
38 DriveInfo *dinfo = drive_get_by_blockdev(bs);
40 if (dinfo->auto_del) {
45 QemuOpts *drive_add(const char *file, const char *fmt, ...)
52 vsnprintf(optstr, sizeof(optstr), fmt, ap);
55 opts = qemu_opts_parse(qemu_find_opts("drive"), optstr, 0);
60 qemu_opt_set(opts, "file", file);
64 DriveInfo *drive_get(BlockInterfaceType type, int bus, int unit)
68 /* seek interface, bus and unit */
70 QTAILQ_FOREACH(dinfo, &drives, next) {
71 if (dinfo->type == type &&
80 int drive_get_max_bus(BlockInterfaceType type)
86 QTAILQ_FOREACH(dinfo, &drives, next) {
87 if(dinfo->type == type &&
94 DriveInfo *drive_get_by_blockdev(BlockDriverState *bs)
98 QTAILQ_FOREACH(dinfo, &drives, next) {
99 if (dinfo->bdrv == bs) {
106 static void bdrv_format_print(void *opaque, const char *name)
108 fprintf(stderr, " %s", name);
111 void drive_uninit(DriveInfo *dinfo)
113 qemu_opts_del(dinfo->opts);
114 bdrv_delete(dinfo->bdrv);
115 QTAILQ_REMOVE(&drives, dinfo, next);
119 static int parse_block_error_action(const char *buf, int is_read)
121 if (!strcmp(buf, "ignore")) {
122 return BLOCK_ERR_IGNORE;
123 } else if (!is_read && !strcmp(buf, "enospc")) {
124 return BLOCK_ERR_STOP_ENOSPC;
125 } else if (!strcmp(buf, "stop")) {
126 return BLOCK_ERR_STOP_ANY;
127 } else if (!strcmp(buf, "report")) {
128 return BLOCK_ERR_REPORT;
130 fprintf(stderr, "qemu: '%s' invalid %s error action\n",
131 buf, is_read ? "read" : "write");
136 DriveInfo *drive_init(QemuOpts *opts, int default_to_scsi, int *fatal_error)
139 const char *file = NULL;
142 const char *mediastr = "";
143 BlockInterfaceType type;
144 enum { MEDIA_DISK, MEDIA_CDROM } media;
146 int cyls, heads, secs, translation;
147 BlockDriver *drv = NULL;
152 int on_read_error, on_write_error;
160 translation = BIOS_ATA_TRANSLATION_AUTO;
162 if (default_to_scsi) {
164 max_devs = MAX_SCSI_DEVS;
165 pstrcpy(devname, sizeof(devname), "scsi");
168 max_devs = MAX_IDE_DEVS;
169 pstrcpy(devname, sizeof(devname), "ide");
173 /* extract parameters */
174 bus_id = qemu_opt_get_number(opts, "bus", 0);
175 unit_id = qemu_opt_get_number(opts, "unit", -1);
176 index = qemu_opt_get_number(opts, "index", -1);
178 cyls = qemu_opt_get_number(opts, "cyls", 0);
179 heads = qemu_opt_get_number(opts, "heads", 0);
180 secs = qemu_opt_get_number(opts, "secs", 0);
182 snapshot = qemu_opt_get_bool(opts, "snapshot", 0);
183 ro = qemu_opt_get_bool(opts, "readonly", 0);
185 file = qemu_opt_get(opts, "file");
186 serial = qemu_opt_get(opts, "serial");
188 if ((buf = qemu_opt_get(opts, "if")) != NULL) {
189 pstrcpy(devname, sizeof(devname), buf);
190 if (!strcmp(buf, "ide")) {
192 max_devs = MAX_IDE_DEVS;
193 } else if (!strcmp(buf, "scsi")) {
195 max_devs = MAX_SCSI_DEVS;
196 } else if (!strcmp(buf, "floppy")) {
199 } else if (!strcmp(buf, "pflash")) {
202 } else if (!strcmp(buf, "mtd")) {
205 } else if (!strcmp(buf, "sd")) {
208 } else if (!strcmp(buf, "virtio")) {
211 } else if (!strcmp(buf, "xen")) {
214 } else if (!strcmp(buf, "none")) {
218 fprintf(stderr, "qemu: unsupported bus type '%s'\n", buf);
223 if (cyls || heads || secs) {
224 if (cyls < 1 || (type == IF_IDE && cyls > 16383)) {
225 fprintf(stderr, "qemu: '%s' invalid physical cyls number\n", buf);
228 if (heads < 1 || (type == IF_IDE && heads > 16)) {
229 fprintf(stderr, "qemu: '%s' invalid physical heads number\n", buf);
232 if (secs < 1 || (type == IF_IDE && secs > 63)) {
233 fprintf(stderr, "qemu: '%s' invalid physical secs number\n", buf);
238 if ((buf = qemu_opt_get(opts, "trans")) != NULL) {
241 "qemu: '%s' trans must be used with cyls,heads and secs\n",
245 if (!strcmp(buf, "none"))
246 translation = BIOS_ATA_TRANSLATION_NONE;
247 else if (!strcmp(buf, "lba"))
248 translation = BIOS_ATA_TRANSLATION_LBA;
249 else if (!strcmp(buf, "auto"))
250 translation = BIOS_ATA_TRANSLATION_AUTO;
252 fprintf(stderr, "qemu: '%s' invalid translation type\n", buf);
257 if ((buf = qemu_opt_get(opts, "media")) != NULL) {
258 if (!strcmp(buf, "disk")) {
260 } else if (!strcmp(buf, "cdrom")) {
261 if (cyls || secs || heads) {
263 "qemu: '%s' invalid physical CHS format\n", buf);
268 fprintf(stderr, "qemu: '%s' invalid media\n", buf);
273 if ((buf = qemu_opt_get(opts, "cache")) != NULL) {
274 if (!strcmp(buf, "off") || !strcmp(buf, "none")) {
275 bdrv_flags |= BDRV_O_NOCACHE;
276 } else if (!strcmp(buf, "writeback")) {
277 bdrv_flags |= BDRV_O_CACHE_WB;
278 } else if (!strcmp(buf, "unsafe")) {
279 bdrv_flags |= BDRV_O_CACHE_WB;
280 bdrv_flags |= BDRV_O_NO_FLUSH;
281 } else if (!strcmp(buf, "writethrough")) {
282 /* this is the default */
284 fprintf(stderr, "qemu: invalid cache option\n");
289 #ifdef CONFIG_LINUX_AIO
290 if ((buf = qemu_opt_get(opts, "aio")) != NULL) {
291 if (!strcmp(buf, "native")) {
292 bdrv_flags |= BDRV_O_NATIVE_AIO;
293 } else if (!strcmp(buf, "threads")) {
294 /* this is the default */
296 fprintf(stderr, "qemu: invalid aio option\n");
302 if ((buf = qemu_opt_get(opts, "format")) != NULL) {
303 if (strcmp(buf, "?") == 0) {
304 fprintf(stderr, "qemu: Supported formats:");
305 bdrv_iterate_format(bdrv_format_print, NULL);
306 fprintf(stderr, "\n");
309 drv = bdrv_find_whitelisted_format(buf);
311 fprintf(stderr, "qemu: '%s' invalid format\n", buf);
316 on_write_error = BLOCK_ERR_STOP_ENOSPC;
317 if ((buf = qemu_opt_get(opts, "werror")) != NULL) {
318 if (type != IF_IDE && type != IF_SCSI && type != IF_VIRTIO && type != IF_NONE) {
319 fprintf(stderr, "werror is not supported by this format\n");
323 on_write_error = parse_block_error_action(buf, 0);
324 if (on_write_error < 0) {
329 on_read_error = BLOCK_ERR_REPORT;
330 if ((buf = qemu_opt_get(opts, "rerror")) != NULL) {
331 if (type != IF_IDE && type != IF_VIRTIO && type != IF_SCSI && type != IF_NONE) {
332 fprintf(stderr, "rerror is not supported by this format\n");
336 on_read_error = parse_block_error_action(buf, 1);
337 if (on_read_error < 0) {
342 if ((devaddr = qemu_opt_get(opts, "addr")) != NULL) {
343 if (type != IF_VIRTIO) {
344 fprintf(stderr, "addr is not supported\n");
349 /* compute bus and unit according index */
352 if (bus_id != 0 || unit_id != -1) {
354 "qemu: index cannot be used with bus and unit\n");
362 unit_id = index % max_devs;
363 bus_id = index / max_devs;
367 /* if user doesn't specify a unit_id,
368 * try to find the first free
373 while (drive_get(type, bus_id, unit_id) != NULL) {
375 if (max_devs && unit_id >= max_devs) {
384 if (max_devs && unit_id >= max_devs) {
385 fprintf(stderr, "qemu: unit %d too big (max is %d)\n",
386 unit_id, max_devs - 1);
391 * ignore multiple definitions
394 if (drive_get(type, bus_id, unit_id) != NULL) {
401 dinfo = qemu_mallocz(sizeof(*dinfo));
402 if ((buf = qemu_opts_id(opts)) != NULL) {
403 dinfo->id = qemu_strdup(buf);
405 /* no id supplied -> create one */
406 dinfo->id = qemu_mallocz(32);
407 if (type == IF_IDE || type == IF_SCSI)
408 mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd";
410 snprintf(dinfo->id, 32, "%s%i%s%i",
411 devname, bus_id, mediastr, unit_id);
413 snprintf(dinfo->id, 32, "%s%s%i",
414 devname, mediastr, unit_id);
416 dinfo->bdrv = bdrv_new(dinfo->id);
417 dinfo->devaddr = devaddr;
420 dinfo->unit = unit_id;
423 strncpy(dinfo->serial, serial, sizeof(dinfo->serial) - 1);
424 QTAILQ_INSERT_TAIL(&drives, dinfo, next);
426 bdrv_set_on_error(dinfo->bdrv, on_read_error, on_write_error);
436 bdrv_set_geometry_hint(dinfo->bdrv, cyls, heads, secs);
437 bdrv_set_translation_hint(dinfo->bdrv, translation);
441 bdrv_set_type_hint(dinfo->bdrv, BDRV_TYPE_CDROM);
446 /* FIXME: This isn't really a floppy, but it's a reasonable
449 bdrv_set_type_hint(dinfo->bdrv, BDRV_TYPE_FLOPPY);
455 /* add virtio block device */
456 opts = qemu_opts_create(qemu_find_opts("device"), NULL, 0);
457 qemu_opt_set(opts, "driver", "virtio-blk-pci");
458 qemu_opt_set(opts, "drive", dinfo->id);
460 qemu_opt_set(opts, "addr", devaddr);
465 if (!file || !*file) {
470 /* always use cache=unsafe with snapshot */
471 bdrv_flags &= ~BDRV_O_CACHE_MASK;
472 bdrv_flags |= (BDRV_O_SNAPSHOT|BDRV_O_CACHE_WB|BDRV_O_NO_FLUSH);
475 if (media == MEDIA_CDROM) {
476 /* CDROM is fine for any interface, don't check. */
478 } else if (ro == 1) {
479 if (type != IF_SCSI && type != IF_VIRTIO && type != IF_FLOPPY && type != IF_NONE) {
480 fprintf(stderr, "qemu: readonly flag not supported for drive with this interface\n");
485 bdrv_flags |= ro ? 0 : BDRV_O_RDWR;
487 ret = bdrv_open(dinfo->bdrv, file, bdrv_flags, drv);
489 fprintf(stderr, "qemu: could not open disk image %s: %s\n",
490 file, strerror(-ret));
494 if (bdrv_key_required(dinfo->bdrv))
500 void do_commit(Monitor *mon, const QDict *qdict)
502 const char *device = qdict_get_str(qdict, "device");
503 BlockDriverState *bs;
505 if (!strcmp(device, "all")) {
508 bs = bdrv_find(device);
510 qerror_report(QERR_DEVICE_NOT_FOUND, device);
517 static int eject_device(Monitor *mon, BlockDriverState *bs, int force)
520 if (!bdrv_is_removable(bs)) {
521 qerror_report(QERR_DEVICE_NOT_REMOVABLE,
522 bdrv_get_device_name(bs));
525 if (bdrv_is_locked(bs)) {
526 qerror_report(QERR_DEVICE_LOCKED, bdrv_get_device_name(bs));
534 int do_eject(Monitor *mon, const QDict *qdict, QObject **ret_data)
536 BlockDriverState *bs;
537 int force = qdict_get_try_bool(qdict, "force", 0);
538 const char *filename = qdict_get_str(qdict, "device");
540 bs = bdrv_find(filename);
542 qerror_report(QERR_DEVICE_NOT_FOUND, filename);
545 return eject_device(mon, bs, force);
548 int do_block_set_passwd(Monitor *mon, const QDict *qdict,
551 BlockDriverState *bs;
554 bs = bdrv_find(qdict_get_str(qdict, "device"));
556 qerror_report(QERR_DEVICE_NOT_FOUND, qdict_get_str(qdict, "device"));
560 err = bdrv_set_key(bs, qdict_get_str(qdict, "password"));
561 if (err == -EINVAL) {
562 qerror_report(QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs));
564 } else if (err < 0) {
565 qerror_report(QERR_INVALID_PASSWORD);
572 int do_change_block(Monitor *mon, const char *device,
573 const char *filename, const char *fmt)
575 BlockDriverState *bs;
576 BlockDriver *drv = NULL;
579 bs = bdrv_find(device);
581 qerror_report(QERR_DEVICE_NOT_FOUND, device);
585 drv = bdrv_find_whitelisted_format(fmt);
587 qerror_report(QERR_INVALID_BLOCK_FORMAT, fmt);
591 if (eject_device(mon, bs, 0) < 0) {
594 bdrv_flags = bdrv_is_read_only(bs) ? 0 : BDRV_O_RDWR;
595 bdrv_flags |= bdrv_is_snapshot(bs) ? BDRV_O_SNAPSHOT : 0;
596 if (bdrv_open(bs, filename, bdrv_flags, drv) < 0) {
597 qerror_report(QERR_OPEN_FILE_FAILED, filename);
600 return monitor_read_bdrv_key_start(mon, bs, NULL, NULL);
603 int do_drive_del(Monitor *mon, const QDict *qdict, QObject **ret_data)
605 const char *id = qdict_get_str(qdict, "id");
606 BlockDriverState *bs;
607 BlockDriverState **ptr;
612 qerror_report(QERR_DEVICE_NOT_FOUND, id);
616 /* quiesce block driver; prevent further io */
621 /* clean up guest state from pointing to host resource by
622 * finding and removing DeviceState "drive" property */
623 for (prop = bs->peer->info->props; prop && prop->name; prop++) {
624 if (prop->info->type == PROP_TYPE_DRIVE) {
625 ptr = qdev_get_prop_ptr(bs->peer, prop);
627 bdrv_detach(bs, bs->peer);
634 /* clean up host side */
635 drive_uninit(drive_get_by_blockdev(bs));