vga: remove CONFIG_BOCHS_VBE
[qemu/opensuse.git] / blockdev.c
blob99828ad2bdbc7dcbb137f4e719d621cc934c1b24
1 /*
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.
8 */
10 #include "blockdev.h"
11 #include "hw/block-common.h"
12 #include "blockjob.h"
13 #include "monitor.h"
14 #include "qerror.h"
15 #include "qemu-option.h"
16 #include "qemu-config.h"
17 #include "qemu-objects.h"
18 #include "sysemu.h"
19 #include "block_int.h"
20 #include "qmp-commands.h"
21 #include "trace.h"
22 #include "arch_init.h"
24 static QTAILQ_HEAD(drivelist, DriveInfo) drives = QTAILQ_HEAD_INITIALIZER(drives);
26 static const char *const if_name[IF_COUNT] = {
27 [IF_NONE] = "none",
28 [IF_IDE] = "ide",
29 [IF_SCSI] = "scsi",
30 [IF_FLOPPY] = "floppy",
31 [IF_PFLASH] = "pflash",
32 [IF_MTD] = "mtd",
33 [IF_SD] = "sd",
34 [IF_VIRTIO] = "virtio",
35 [IF_XEN] = "xen",
38 static const int if_max_devs[IF_COUNT] = {
40 * Do not change these numbers! They govern how drive option
41 * index maps to unit and bus. That mapping is ABI.
43 * All controllers used to imlement if=T drives need to support
44 * if_max_devs[T] units, for any T with if_max_devs[T] != 0.
45 * Otherwise, some index values map to "impossible" bus, unit
46 * values.
48 * For instance, if you change [IF_SCSI] to 255, -drive
49 * if=scsi,index=12 no longer means bus=1,unit=5, but
50 * bus=0,unit=12. With an lsi53c895a controller (7 units max),
51 * the drive can't be set up. Regression.
53 [IF_IDE] = 2,
54 [IF_SCSI] = 7,
58 * We automatically delete the drive when a device using it gets
59 * unplugged. Questionable feature, but we can't just drop it.
60 * Device models call blockdev_mark_auto_del() to schedule the
61 * automatic deletion, and generic qdev code calls blockdev_auto_del()
62 * when deletion is actually safe.
64 void blockdev_mark_auto_del(BlockDriverState *bs)
66 DriveInfo *dinfo = drive_get_by_blockdev(bs);
68 if (bs->job) {
69 block_job_cancel(bs->job);
71 if (dinfo) {
72 dinfo->auto_del = 1;
76 void blockdev_auto_del(BlockDriverState *bs)
78 DriveInfo *dinfo = drive_get_by_blockdev(bs);
80 if (dinfo && dinfo->auto_del) {
81 drive_put_ref(dinfo);
85 static int drive_index_to_bus_id(BlockInterfaceType type, int index)
87 int max_devs = if_max_devs[type];
88 return max_devs ? index / max_devs : 0;
91 static int drive_index_to_unit_id(BlockInterfaceType type, int index)
93 int max_devs = if_max_devs[type];
94 return max_devs ? index % max_devs : index;
97 QemuOpts *drive_def(const char *optstr)
99 return qemu_opts_parse(qemu_find_opts("drive"), optstr, 0);
102 QemuOpts *drive_add(BlockInterfaceType type, int index, const char *file,
103 const char *optstr)
105 QemuOpts *opts;
106 char buf[32];
108 opts = drive_def(optstr);
109 if (!opts) {
110 return NULL;
112 if (type != IF_DEFAULT) {
113 qemu_opt_set(opts, "if", if_name[type]);
115 if (index >= 0) {
116 snprintf(buf, sizeof(buf), "%d", index);
117 qemu_opt_set(opts, "index", buf);
119 if (file)
120 qemu_opt_set(opts, "file", file);
121 return opts;
124 DriveInfo *drive_get(BlockInterfaceType type, int bus, int unit)
126 DriveInfo *dinfo;
128 /* seek interface, bus and unit */
130 QTAILQ_FOREACH(dinfo, &drives, next) {
131 if (dinfo->type == type &&
132 dinfo->bus == bus &&
133 dinfo->unit == unit)
134 return dinfo;
137 return NULL;
140 DriveInfo *drive_get_by_index(BlockInterfaceType type, int index)
142 return drive_get(type,
143 drive_index_to_bus_id(type, index),
144 drive_index_to_unit_id(type, index));
147 int drive_get_max_bus(BlockInterfaceType type)
149 int max_bus;
150 DriveInfo *dinfo;
152 max_bus = -1;
153 QTAILQ_FOREACH(dinfo, &drives, next) {
154 if(dinfo->type == type &&
155 dinfo->bus > max_bus)
156 max_bus = dinfo->bus;
158 return max_bus;
161 /* Get a block device. This should only be used for single-drive devices
162 (e.g. SD/Floppy/MTD). Multi-disk devices (scsi/ide) should use the
163 appropriate bus. */
164 DriveInfo *drive_get_next(BlockInterfaceType type)
166 static int next_block_unit[IF_COUNT];
168 return drive_get(type, 0, next_block_unit[type]++);
171 DriveInfo *drive_get_by_blockdev(BlockDriverState *bs)
173 DriveInfo *dinfo;
175 QTAILQ_FOREACH(dinfo, &drives, next) {
176 if (dinfo->bdrv == bs) {
177 return dinfo;
180 return NULL;
183 static void bdrv_format_print(void *opaque, const char *name)
185 error_printf(" %s", name);
188 static void drive_uninit(DriveInfo *dinfo)
190 qemu_opts_del(dinfo->opts);
191 bdrv_delete(dinfo->bdrv);
192 g_free(dinfo->id);
193 QTAILQ_REMOVE(&drives, dinfo, next);
194 g_free(dinfo);
197 void drive_put_ref(DriveInfo *dinfo)
199 assert(dinfo->refcount);
200 if (--dinfo->refcount == 0) {
201 drive_uninit(dinfo);
205 void drive_get_ref(DriveInfo *dinfo)
207 dinfo->refcount++;
210 typedef struct {
211 QEMUBH *bh;
212 DriveInfo *dinfo;
213 } DrivePutRefBH;
215 static void drive_put_ref_bh(void *opaque)
217 DrivePutRefBH *s = opaque;
219 drive_put_ref(s->dinfo);
220 qemu_bh_delete(s->bh);
221 g_free(s);
225 * Release a drive reference in a BH
227 * It is not possible to use drive_put_ref() from a callback function when the
228 * callers still need the drive. In such cases we schedule a BH to release the
229 * reference.
231 static void drive_put_ref_bh_schedule(DriveInfo *dinfo)
233 DrivePutRefBH *s;
235 s = g_new(DrivePutRefBH, 1);
236 s->bh = qemu_bh_new(drive_put_ref_bh, s);
237 s->dinfo = dinfo;
238 qemu_bh_schedule(s->bh);
241 static int parse_block_error_action(const char *buf, bool is_read)
243 if (!strcmp(buf, "ignore")) {
244 return BLOCKDEV_ON_ERROR_IGNORE;
245 } else if (!is_read && !strcmp(buf, "enospc")) {
246 return BLOCKDEV_ON_ERROR_ENOSPC;
247 } else if (!strcmp(buf, "stop")) {
248 return BLOCKDEV_ON_ERROR_STOP;
249 } else if (!strcmp(buf, "report")) {
250 return BLOCKDEV_ON_ERROR_REPORT;
251 } else {
252 error_report("'%s' invalid %s error action",
253 buf, is_read ? "read" : "write");
254 return -1;
258 static bool do_check_io_limits(BlockIOLimit *io_limits)
260 bool bps_flag;
261 bool iops_flag;
263 assert(io_limits);
265 bps_flag = (io_limits->bps[BLOCK_IO_LIMIT_TOTAL] != 0)
266 && ((io_limits->bps[BLOCK_IO_LIMIT_READ] != 0)
267 || (io_limits->bps[BLOCK_IO_LIMIT_WRITE] != 0));
268 iops_flag = (io_limits->iops[BLOCK_IO_LIMIT_TOTAL] != 0)
269 && ((io_limits->iops[BLOCK_IO_LIMIT_READ] != 0)
270 || (io_limits->iops[BLOCK_IO_LIMIT_WRITE] != 0));
271 if (bps_flag || iops_flag) {
272 return false;
275 return true;
278 DriveInfo *drive_init(QemuOpts *opts, int default_to_scsi)
280 const char *buf;
281 const char *file = NULL;
282 const char *serial;
283 const char *mediastr = "";
284 BlockInterfaceType type;
285 enum { MEDIA_DISK, MEDIA_CDROM } media;
286 int bus_id, unit_id;
287 int cyls, heads, secs, translation;
288 BlockDriver *drv = NULL;
289 int max_devs;
290 int index;
291 int ro = 0;
292 int bdrv_flags = 0;
293 int on_read_error, on_write_error;
294 const char *devaddr;
295 DriveInfo *dinfo;
296 BlockIOLimit io_limits;
297 int snapshot = 0;
298 bool copy_on_read;
299 int ret;
301 translation = BIOS_ATA_TRANSLATION_AUTO;
302 media = MEDIA_DISK;
304 /* extract parameters */
305 bus_id = qemu_opt_get_number(opts, "bus", 0);
306 unit_id = qemu_opt_get_number(opts, "unit", -1);
307 index = qemu_opt_get_number(opts, "index", -1);
309 cyls = qemu_opt_get_number(opts, "cyls", 0);
310 heads = qemu_opt_get_number(opts, "heads", 0);
311 secs = qemu_opt_get_number(opts, "secs", 0);
313 snapshot = qemu_opt_get_bool(opts, "snapshot", 0);
314 ro = qemu_opt_get_bool(opts, "readonly", 0);
315 copy_on_read = qemu_opt_get_bool(opts, "copy-on-read", false);
317 file = qemu_opt_get(opts, "file");
318 serial = qemu_opt_get(opts, "serial");
320 if ((buf = qemu_opt_get(opts, "if")) != NULL) {
321 for (type = 0; type < IF_COUNT && strcmp(buf, if_name[type]); type++)
323 if (type == IF_COUNT) {
324 error_report("unsupported bus type '%s'", buf);
325 return NULL;
327 } else {
328 type = default_to_scsi ? IF_SCSI : IF_IDE;
331 max_devs = if_max_devs[type];
333 if (cyls || heads || secs) {
334 if (cyls < 1) {
335 error_report("invalid physical cyls number");
336 return NULL;
338 if (heads < 1) {
339 error_report("invalid physical heads number");
340 return NULL;
342 if (secs < 1) {
343 error_report("invalid physical secs number");
344 return NULL;
348 if ((buf = qemu_opt_get(opts, "trans")) != NULL) {
349 if (!cyls) {
350 error_report("'%s' trans must be used with cyls, heads and secs",
351 buf);
352 return NULL;
354 if (!strcmp(buf, "none"))
355 translation = BIOS_ATA_TRANSLATION_NONE;
356 else if (!strcmp(buf, "lba"))
357 translation = BIOS_ATA_TRANSLATION_LBA;
358 else if (!strcmp(buf, "auto"))
359 translation = BIOS_ATA_TRANSLATION_AUTO;
360 else {
361 error_report("'%s' invalid translation type", buf);
362 return NULL;
366 if ((buf = qemu_opt_get(opts, "media")) != NULL) {
367 if (!strcmp(buf, "disk")) {
368 media = MEDIA_DISK;
369 } else if (!strcmp(buf, "cdrom")) {
370 if (cyls || secs || heads) {
371 error_report("CHS can't be set with media=%s", buf);
372 return NULL;
374 media = MEDIA_CDROM;
375 } else {
376 error_report("'%s' invalid media", buf);
377 return NULL;
381 bdrv_flags |= BDRV_O_CACHE_WB;
382 if ((buf = qemu_opt_get(opts, "cache")) != NULL) {
383 if (bdrv_parse_cache_flags(buf, &bdrv_flags) != 0) {
384 error_report("invalid cache option");
385 return NULL;
389 #ifdef CONFIG_LINUX_AIO
390 if ((buf = qemu_opt_get(opts, "aio")) != NULL) {
391 if (!strcmp(buf, "native")) {
392 bdrv_flags |= BDRV_O_NATIVE_AIO;
393 } else if (!strcmp(buf, "threads")) {
394 /* this is the default */
395 } else {
396 error_report("invalid aio option");
397 return NULL;
400 #endif
402 if ((buf = qemu_opt_get(opts, "format")) != NULL) {
403 if (is_help_option(buf)) {
404 error_printf("Supported formats:");
405 bdrv_iterate_format(bdrv_format_print, NULL);
406 error_printf("\n");
407 return NULL;
409 drv = bdrv_find_whitelisted_format(buf);
410 if (!drv) {
411 error_report("'%s' invalid format", buf);
412 return NULL;
416 /* disk I/O throttling */
417 io_limits.bps[BLOCK_IO_LIMIT_TOTAL] =
418 qemu_opt_get_number(opts, "bps", 0);
419 io_limits.bps[BLOCK_IO_LIMIT_READ] =
420 qemu_opt_get_number(opts, "bps_rd", 0);
421 io_limits.bps[BLOCK_IO_LIMIT_WRITE] =
422 qemu_opt_get_number(opts, "bps_wr", 0);
423 io_limits.iops[BLOCK_IO_LIMIT_TOTAL] =
424 qemu_opt_get_number(opts, "iops", 0);
425 io_limits.iops[BLOCK_IO_LIMIT_READ] =
426 qemu_opt_get_number(opts, "iops_rd", 0);
427 io_limits.iops[BLOCK_IO_LIMIT_WRITE] =
428 qemu_opt_get_number(opts, "iops_wr", 0);
430 if (!do_check_io_limits(&io_limits)) {
431 error_report("bps(iops) and bps_rd/bps_wr(iops_rd/iops_wr) "
432 "cannot be used at the same time");
433 return NULL;
436 on_write_error = BLOCKDEV_ON_ERROR_ENOSPC;
437 if ((buf = qemu_opt_get(opts, "werror")) != NULL) {
438 if (type != IF_IDE && type != IF_SCSI && type != IF_VIRTIO && type != IF_NONE) {
439 error_report("werror is not supported by this bus type");
440 return NULL;
443 on_write_error = parse_block_error_action(buf, 0);
444 if (on_write_error < 0) {
445 return NULL;
449 on_read_error = BLOCKDEV_ON_ERROR_REPORT;
450 if ((buf = qemu_opt_get(opts, "rerror")) != NULL) {
451 if (type != IF_IDE && type != IF_VIRTIO && type != IF_SCSI && type != IF_NONE) {
452 error_report("rerror is not supported by this bus type");
453 return NULL;
456 on_read_error = parse_block_error_action(buf, 1);
457 if (on_read_error < 0) {
458 return NULL;
462 if ((devaddr = qemu_opt_get(opts, "addr")) != NULL) {
463 if (type != IF_VIRTIO) {
464 error_report("addr is not supported by this bus type");
465 return NULL;
469 /* compute bus and unit according index */
471 if (index != -1) {
472 if (bus_id != 0 || unit_id != -1) {
473 error_report("index cannot be used with bus and unit");
474 return NULL;
476 bus_id = drive_index_to_bus_id(type, index);
477 unit_id = drive_index_to_unit_id(type, index);
480 /* if user doesn't specify a unit_id,
481 * try to find the first free
484 if (unit_id == -1) {
485 unit_id = 0;
486 while (drive_get(type, bus_id, unit_id) != NULL) {
487 unit_id++;
488 if (max_devs && unit_id >= max_devs) {
489 unit_id -= max_devs;
490 bus_id++;
495 /* check unit id */
497 if (max_devs && unit_id >= max_devs) {
498 error_report("unit %d too big (max is %d)",
499 unit_id, max_devs - 1);
500 return NULL;
504 * catch multiple definitions
507 if (drive_get(type, bus_id, unit_id) != NULL) {
508 error_report("drive with bus=%d, unit=%d (index=%d) exists",
509 bus_id, unit_id, index);
510 return NULL;
513 /* init */
515 dinfo = g_malloc0(sizeof(*dinfo));
516 if ((buf = qemu_opts_id(opts)) != NULL) {
517 dinfo->id = g_strdup(buf);
518 } else {
519 /* no id supplied -> create one */
520 dinfo->id = g_malloc0(32);
521 if (type == IF_IDE || type == IF_SCSI)
522 mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd";
523 if (max_devs)
524 snprintf(dinfo->id, 32, "%s%i%s%i",
525 if_name[type], bus_id, mediastr, unit_id);
526 else
527 snprintf(dinfo->id, 32, "%s%s%i",
528 if_name[type], mediastr, unit_id);
530 dinfo->bdrv = bdrv_new(dinfo->id);
531 dinfo->bdrv->open_flags = snapshot ? BDRV_O_SNAPSHOT : 0;
532 dinfo->bdrv->read_only = ro;
533 dinfo->devaddr = devaddr;
534 dinfo->type = type;
535 dinfo->bus = bus_id;
536 dinfo->unit = unit_id;
537 dinfo->cyls = cyls;
538 dinfo->heads = heads;
539 dinfo->secs = secs;
540 dinfo->trans = translation;
541 dinfo->opts = opts;
542 dinfo->refcount = 1;
543 dinfo->serial = serial;
544 QTAILQ_INSERT_TAIL(&drives, dinfo, next);
546 bdrv_set_on_error(dinfo->bdrv, on_read_error, on_write_error);
548 /* disk I/O throttling */
549 bdrv_set_io_limits(dinfo->bdrv, &io_limits);
551 switch(type) {
552 case IF_IDE:
553 case IF_SCSI:
554 case IF_XEN:
555 case IF_NONE:
556 dinfo->media_cd = media == MEDIA_CDROM;
557 break;
558 case IF_SD:
559 case IF_FLOPPY:
560 case IF_PFLASH:
561 case IF_MTD:
562 break;
563 case IF_VIRTIO:
564 /* add virtio block device */
565 opts = qemu_opts_create(qemu_find_opts("device"), NULL, 0, NULL);
566 if (arch_type == QEMU_ARCH_S390X) {
567 qemu_opt_set(opts, "driver", "virtio-blk-s390");
568 } else {
569 qemu_opt_set(opts, "driver", "virtio-blk-pci");
571 qemu_opt_set(opts, "drive", dinfo->id);
572 if (devaddr)
573 qemu_opt_set(opts, "addr", devaddr);
574 break;
575 default:
576 abort();
578 if (!file || !*file) {
579 return dinfo;
581 if (snapshot) {
582 /* always use cache=unsafe with snapshot */
583 bdrv_flags &= ~BDRV_O_CACHE_MASK;
584 bdrv_flags |= (BDRV_O_SNAPSHOT|BDRV_O_CACHE_WB|BDRV_O_NO_FLUSH);
587 if (copy_on_read) {
588 bdrv_flags |= BDRV_O_COPY_ON_READ;
591 if (runstate_check(RUN_STATE_INMIGRATE)) {
592 bdrv_flags |= BDRV_O_INCOMING;
595 if (media == MEDIA_CDROM) {
596 /* CDROM is fine for any interface, don't check. */
597 ro = 1;
598 } else if (ro == 1) {
599 if (type != IF_SCSI && type != IF_VIRTIO && type != IF_FLOPPY &&
600 type != IF_NONE && type != IF_PFLASH) {
601 error_report("readonly not supported by this bus type");
602 goto err;
606 bdrv_flags |= ro ? 0 : BDRV_O_RDWR;
608 if (ro && copy_on_read) {
609 error_report("warning: disabling copy_on_read on readonly drive");
612 ret = bdrv_open(dinfo->bdrv, file, bdrv_flags, drv);
613 if (ret < 0) {
614 error_report("could not open disk image %s: %s",
615 file, strerror(-ret));
616 goto err;
619 if (bdrv_key_required(dinfo->bdrv))
620 autostart = 0;
621 return dinfo;
623 err:
624 bdrv_delete(dinfo->bdrv);
625 g_free(dinfo->id);
626 QTAILQ_REMOVE(&drives, dinfo, next);
627 g_free(dinfo);
628 return NULL;
631 void do_commit(Monitor *mon, const QDict *qdict)
633 const char *device = qdict_get_str(qdict, "device");
634 BlockDriverState *bs;
635 int ret;
637 if (!strcmp(device, "all")) {
638 ret = bdrv_commit_all();
639 if (ret == -EBUSY) {
640 qerror_report(QERR_DEVICE_IN_USE, device);
641 return;
643 } else {
644 bs = bdrv_find(device);
645 if (!bs) {
646 qerror_report(QERR_DEVICE_NOT_FOUND, device);
647 return;
649 ret = bdrv_commit(bs);
650 if (ret == -EBUSY) {
651 qerror_report(QERR_DEVICE_IN_USE, device);
652 return;
657 static void blockdev_do_action(int kind, void *data, Error **errp)
659 BlockdevAction action;
660 BlockdevActionList list;
662 action.kind = kind;
663 action.data = data;
664 list.value = &action;
665 list.next = NULL;
666 qmp_transaction(&list, errp);
669 void qmp_blockdev_snapshot_sync(const char *device, const char *snapshot_file,
670 bool has_format, const char *format,
671 bool has_mode, enum NewImageMode mode,
672 Error **errp)
674 BlockdevSnapshot snapshot = {
675 .device = (char *) device,
676 .snapshot_file = (char *) snapshot_file,
677 .has_format = has_format,
678 .format = (char *) format,
679 .has_mode = has_mode,
680 .mode = mode,
682 blockdev_do_action(BLOCKDEV_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC, &snapshot,
683 errp);
687 /* New and old BlockDriverState structs for group snapshots */
688 typedef struct BlkTransactionStates {
689 BlockDriverState *old_bs;
690 BlockDriverState *new_bs;
691 QSIMPLEQ_ENTRY(BlkTransactionStates) entry;
692 } BlkTransactionStates;
695 * 'Atomic' group snapshots. The snapshots are taken as a set, and if any fail
696 * then we do not pivot any of the devices in the group, and abandon the
697 * snapshots
699 void qmp_transaction(BlockdevActionList *dev_list, Error **errp)
701 int ret = 0;
702 BlockdevActionList *dev_entry = dev_list;
703 BlkTransactionStates *states, *next;
705 QSIMPLEQ_HEAD(snap_bdrv_states, BlkTransactionStates) snap_bdrv_states;
706 QSIMPLEQ_INIT(&snap_bdrv_states);
708 /* drain all i/o before any snapshots */
709 bdrv_drain_all();
711 /* We don't do anything in this loop that commits us to the snapshot */
712 while (NULL != dev_entry) {
713 BlockdevAction *dev_info = NULL;
714 BlockDriver *proto_drv;
715 BlockDriver *drv;
716 int flags;
717 enum NewImageMode mode;
718 const char *new_image_file;
719 const char *device;
720 const char *format = "qcow2";
722 dev_info = dev_entry->value;
723 dev_entry = dev_entry->next;
725 states = g_malloc0(sizeof(BlkTransactionStates));
726 QSIMPLEQ_INSERT_TAIL(&snap_bdrv_states, states, entry);
728 switch (dev_info->kind) {
729 case BLOCKDEV_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC:
730 device = dev_info->blockdev_snapshot_sync->device;
731 if (!dev_info->blockdev_snapshot_sync->has_mode) {
732 dev_info->blockdev_snapshot_sync->mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
734 new_image_file = dev_info->blockdev_snapshot_sync->snapshot_file;
735 if (dev_info->blockdev_snapshot_sync->has_format) {
736 format = dev_info->blockdev_snapshot_sync->format;
738 mode = dev_info->blockdev_snapshot_sync->mode;
739 break;
740 default:
741 abort();
744 drv = bdrv_find_format(format);
745 if (!drv) {
746 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
747 goto delete_and_fail;
750 states->old_bs = bdrv_find(device);
751 if (!states->old_bs) {
752 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
753 goto delete_and_fail;
756 if (!bdrv_is_inserted(states->old_bs)) {
757 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
758 goto delete_and_fail;
761 if (bdrv_in_use(states->old_bs)) {
762 error_set(errp, QERR_DEVICE_IN_USE, device);
763 goto delete_and_fail;
766 if (!bdrv_is_read_only(states->old_bs)) {
767 if (bdrv_flush(states->old_bs)) {
768 error_set(errp, QERR_IO_ERROR);
769 goto delete_and_fail;
773 flags = states->old_bs->open_flags;
775 proto_drv = bdrv_find_protocol(new_image_file);
776 if (!proto_drv) {
777 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
778 goto delete_and_fail;
781 /* create new image w/backing file */
782 if (mode != NEW_IMAGE_MODE_EXISTING) {
783 ret = bdrv_img_create(new_image_file, format,
784 states->old_bs->filename,
785 states->old_bs->drv->format_name,
786 NULL, -1, flags);
787 if (ret) {
788 error_set(errp, QERR_OPEN_FILE_FAILED, new_image_file);
789 goto delete_and_fail;
793 /* We will manually add the backing_hd field to the bs later */
794 states->new_bs = bdrv_new("");
795 ret = bdrv_open(states->new_bs, new_image_file,
796 flags | BDRV_O_NO_BACKING, drv);
797 if (ret != 0) {
798 error_set(errp, QERR_OPEN_FILE_FAILED, new_image_file);
799 goto delete_and_fail;
804 /* Now we are going to do the actual pivot. Everything up to this point
805 * is reversible, but we are committed at this point */
806 QSIMPLEQ_FOREACH(states, &snap_bdrv_states, entry) {
807 /* This removes our old bs from the bdrv_states, and adds the new bs */
808 bdrv_append(states->new_bs, states->old_bs);
809 /* We don't need (or want) to use the transactional
810 * bdrv_reopen_multiple() across all the entries at once, because we
811 * don't want to abort all of them if one of them fails the reopen */
812 bdrv_reopen(states->new_bs, states->new_bs->open_flags & ~BDRV_O_RDWR,
813 NULL);
816 /* success */
817 goto exit;
819 delete_and_fail:
821 * failure, and it is all-or-none; abandon each new bs, and keep using
822 * the original bs for all images
824 QSIMPLEQ_FOREACH(states, &snap_bdrv_states, entry) {
825 if (states->new_bs) {
826 bdrv_delete(states->new_bs);
829 exit:
830 QSIMPLEQ_FOREACH_SAFE(states, &snap_bdrv_states, entry, next) {
831 g_free(states);
836 static void eject_device(BlockDriverState *bs, int force, Error **errp)
838 if (bdrv_in_use(bs)) {
839 error_set(errp, QERR_DEVICE_IN_USE, bdrv_get_device_name(bs));
840 return;
842 if (!bdrv_dev_has_removable_media(bs)) {
843 error_set(errp, QERR_DEVICE_NOT_REMOVABLE, bdrv_get_device_name(bs));
844 return;
847 if (bdrv_dev_is_medium_locked(bs) && !bdrv_dev_is_tray_open(bs)) {
848 bdrv_dev_eject_request(bs, force);
849 if (!force) {
850 error_set(errp, QERR_DEVICE_LOCKED, bdrv_get_device_name(bs));
851 return;
855 bdrv_close(bs);
858 void qmp_eject(const char *device, bool has_force, bool force, Error **errp)
860 BlockDriverState *bs;
862 bs = bdrv_find(device);
863 if (!bs) {
864 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
865 return;
868 eject_device(bs, force, errp);
871 void qmp_block_passwd(const char *device, const char *password, Error **errp)
873 BlockDriverState *bs;
874 int err;
876 bs = bdrv_find(device);
877 if (!bs) {
878 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
879 return;
882 err = bdrv_set_key(bs, password);
883 if (err == -EINVAL) {
884 error_set(errp, QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs));
885 return;
886 } else if (err < 0) {
887 error_set(errp, QERR_INVALID_PASSWORD);
888 return;
892 static void qmp_bdrv_open_encrypted(BlockDriverState *bs, const char *filename,
893 int bdrv_flags, BlockDriver *drv,
894 const char *password, Error **errp)
896 if (bdrv_open(bs, filename, bdrv_flags, drv) < 0) {
897 error_set(errp, QERR_OPEN_FILE_FAILED, filename);
898 return;
901 if (bdrv_key_required(bs)) {
902 if (password) {
903 if (bdrv_set_key(bs, password) < 0) {
904 error_set(errp, QERR_INVALID_PASSWORD);
906 } else {
907 error_set(errp, QERR_DEVICE_ENCRYPTED, bdrv_get_device_name(bs),
908 bdrv_get_encrypted_filename(bs));
910 } else if (password) {
911 error_set(errp, QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs));
915 void qmp_change_blockdev(const char *device, const char *filename,
916 bool has_format, const char *format, Error **errp)
918 BlockDriverState *bs;
919 BlockDriver *drv = NULL;
920 int bdrv_flags;
921 Error *err = NULL;
923 bs = bdrv_find(device);
924 if (!bs) {
925 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
926 return;
929 if (format) {
930 drv = bdrv_find_whitelisted_format(format);
931 if (!drv) {
932 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
933 return;
937 eject_device(bs, 0, &err);
938 if (error_is_set(&err)) {
939 error_propagate(errp, err);
940 return;
943 bdrv_flags = bdrv_is_read_only(bs) ? 0 : BDRV_O_RDWR;
944 bdrv_flags |= bdrv_is_snapshot(bs) ? BDRV_O_SNAPSHOT : 0;
946 qmp_bdrv_open_encrypted(bs, filename, bdrv_flags, drv, NULL, errp);
949 /* throttling disk I/O limits */
950 void qmp_block_set_io_throttle(const char *device, int64_t bps, int64_t bps_rd,
951 int64_t bps_wr, int64_t iops, int64_t iops_rd,
952 int64_t iops_wr, Error **errp)
954 BlockIOLimit io_limits;
955 BlockDriverState *bs;
957 bs = bdrv_find(device);
958 if (!bs) {
959 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
960 return;
963 io_limits.bps[BLOCK_IO_LIMIT_TOTAL] = bps;
964 io_limits.bps[BLOCK_IO_LIMIT_READ] = bps_rd;
965 io_limits.bps[BLOCK_IO_LIMIT_WRITE] = bps_wr;
966 io_limits.iops[BLOCK_IO_LIMIT_TOTAL]= iops;
967 io_limits.iops[BLOCK_IO_LIMIT_READ] = iops_rd;
968 io_limits.iops[BLOCK_IO_LIMIT_WRITE]= iops_wr;
970 if (!do_check_io_limits(&io_limits)) {
971 error_set(errp, QERR_INVALID_PARAMETER_COMBINATION);
972 return;
975 bs->io_limits = io_limits;
976 bs->slice_time = BLOCK_IO_SLICE_TIME;
978 if (!bs->io_limits_enabled && bdrv_io_limits_enabled(bs)) {
979 bdrv_io_limits_enable(bs);
980 } else if (bs->io_limits_enabled && !bdrv_io_limits_enabled(bs)) {
981 bdrv_io_limits_disable(bs);
982 } else {
983 if (bs->block_timer) {
984 qemu_mod_timer(bs->block_timer, qemu_get_clock_ns(vm_clock));
989 int do_drive_del(Monitor *mon, const QDict *qdict, QObject **ret_data)
991 const char *id = qdict_get_str(qdict, "id");
992 BlockDriverState *bs;
994 bs = bdrv_find(id);
995 if (!bs) {
996 qerror_report(QERR_DEVICE_NOT_FOUND, id);
997 return -1;
999 if (bdrv_in_use(bs)) {
1000 qerror_report(QERR_DEVICE_IN_USE, id);
1001 return -1;
1004 /* quiesce block driver; prevent further io */
1005 bdrv_drain_all();
1006 bdrv_flush(bs);
1007 bdrv_close(bs);
1009 /* if we have a device attached to this BlockDriverState
1010 * then we need to make the drive anonymous until the device
1011 * can be removed. If this is a drive with no device backing
1012 * then we can just get rid of the block driver state right here.
1014 if (bdrv_get_attached_dev(bs)) {
1015 bdrv_make_anon(bs);
1016 } else {
1017 drive_uninit(drive_get_by_blockdev(bs));
1020 return 0;
1023 void qmp_block_resize(const char *device, int64_t size, Error **errp)
1025 BlockDriverState *bs;
1027 bs = bdrv_find(device);
1028 if (!bs) {
1029 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1030 return;
1033 if (size < 0) {
1034 error_set(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size");
1035 return;
1038 switch (bdrv_truncate(bs, size)) {
1039 case 0:
1040 break;
1041 case -ENOMEDIUM:
1042 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1043 break;
1044 case -ENOTSUP:
1045 error_set(errp, QERR_UNSUPPORTED);
1046 break;
1047 case -EACCES:
1048 error_set(errp, QERR_DEVICE_IS_READ_ONLY, device);
1049 break;
1050 case -EBUSY:
1051 error_set(errp, QERR_DEVICE_IN_USE, device);
1052 break;
1053 default:
1054 error_set(errp, QERR_UNDEFINED_ERROR);
1055 break;
1059 static QObject *qobject_from_block_job(BlockJob *job)
1061 return qobject_from_jsonf("{ 'type': %s,"
1062 "'device': %s,"
1063 "'len': %" PRId64 ","
1064 "'offset': %" PRId64 ","
1065 "'speed': %" PRId64 " }",
1066 job->job_type->job_type,
1067 bdrv_get_device_name(job->bs),
1068 job->len,
1069 job->offset,
1070 job->speed);
1073 static void block_job_cb(void *opaque, int ret)
1075 BlockDriverState *bs = opaque;
1076 QObject *obj;
1078 trace_block_job_cb(bs, bs->job, ret);
1080 assert(bs->job);
1081 obj = qobject_from_block_job(bs->job);
1082 if (ret < 0) {
1083 QDict *dict = qobject_to_qdict(obj);
1084 qdict_put(dict, "error", qstring_from_str(strerror(-ret)));
1087 if (block_job_is_cancelled(bs->job)) {
1088 monitor_protocol_event(QEVENT_BLOCK_JOB_CANCELLED, obj);
1089 } else {
1090 monitor_protocol_event(QEVENT_BLOCK_JOB_COMPLETED, obj);
1092 qobject_decref(obj);
1094 drive_put_ref_bh_schedule(drive_get_by_blockdev(bs));
1097 void qmp_block_stream(const char *device, bool has_base,
1098 const char *base, bool has_speed, int64_t speed,
1099 bool has_on_error, BlockdevOnError on_error,
1100 Error **errp)
1102 BlockDriverState *bs;
1103 BlockDriverState *base_bs = NULL;
1104 Error *local_err = NULL;
1106 if (!has_on_error) {
1107 on_error = BLOCKDEV_ON_ERROR_REPORT;
1110 bs = bdrv_find(device);
1111 if (!bs) {
1112 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1113 return;
1116 if (base) {
1117 base_bs = bdrv_find_backing_image(bs, base);
1118 if (base_bs == NULL) {
1119 error_set(errp, QERR_BASE_NOT_FOUND, base);
1120 return;
1124 stream_start(bs, base_bs, base, has_speed ? speed : 0,
1125 on_error, block_job_cb, bs, &local_err);
1126 if (error_is_set(&local_err)) {
1127 error_propagate(errp, local_err);
1128 return;
1131 /* Grab a reference so hotplug does not delete the BlockDriverState from
1132 * underneath us.
1134 drive_get_ref(drive_get_by_blockdev(bs));
1136 trace_qmp_block_stream(bs, bs->job);
1139 void qmp_block_commit(const char *device,
1140 bool has_base, const char *base, const char *top,
1141 bool has_speed, int64_t speed,
1142 Error **errp)
1144 BlockDriverState *bs;
1145 BlockDriverState *base_bs, *top_bs;
1146 Error *local_err = NULL;
1147 /* This will be part of the QMP command, if/when the
1148 * BlockdevOnError change for blkmirror makes it in
1150 BlockdevOnError on_error = BLOCKDEV_ON_ERROR_REPORT;
1152 /* drain all i/o before commits */
1153 bdrv_drain_all();
1155 bs = bdrv_find(device);
1156 if (!bs) {
1157 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1158 return;
1160 if (base && has_base) {
1161 base_bs = bdrv_find_backing_image(bs, base);
1162 } else {
1163 base_bs = bdrv_find_base(bs);
1166 if (base_bs == NULL) {
1167 error_set(errp, QERR_BASE_NOT_FOUND, base ? base : "NULL");
1168 return;
1171 /* default top_bs is the active layer */
1172 top_bs = bs;
1174 if (top) {
1175 if (strcmp(bs->filename, top) != 0) {
1176 top_bs = bdrv_find_backing_image(bs, top);
1180 if (top_bs == NULL) {
1181 error_setg(errp, "Top image file %s not found", top ? top : "NULL");
1182 return;
1185 commit_start(bs, base_bs, top_bs, speed, on_error, block_job_cb, bs,
1186 &local_err);
1187 if (local_err != NULL) {
1188 error_propagate(errp, local_err);
1189 return;
1191 /* Grab a reference so hotplug does not delete the BlockDriverState from
1192 * underneath us.
1194 drive_get_ref(drive_get_by_blockdev(bs));
1197 static BlockJob *find_block_job(const char *device)
1199 BlockDriverState *bs;
1201 bs = bdrv_find(device);
1202 if (!bs || !bs->job) {
1203 return NULL;
1205 return bs->job;
1208 void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp)
1210 BlockJob *job = find_block_job(device);
1212 if (!job) {
1213 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
1214 return;
1217 block_job_set_speed(job, speed, errp);
1220 void qmp_block_job_cancel(const char *device,
1221 bool has_force, bool force, Error **errp)
1223 BlockJob *job = find_block_job(device);
1225 if (!has_force) {
1226 force = false;
1229 if (!job) {
1230 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
1231 return;
1233 if (job->paused && !force) {
1234 error_set(errp, QERR_BLOCK_JOB_PAUSED, device);
1235 return;
1238 trace_qmp_block_job_cancel(job);
1239 block_job_cancel(job);
1242 void qmp_block_job_pause(const char *device, Error **errp)
1244 BlockJob *job = find_block_job(device);
1246 if (!job) {
1247 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
1248 return;
1251 trace_qmp_block_job_pause(job);
1252 block_job_pause(job);
1255 void qmp_block_job_resume(const char *device, Error **errp)
1257 BlockJob *job = find_block_job(device);
1259 if (!job) {
1260 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
1261 return;
1264 trace_qmp_block_job_resume(job);
1265 block_job_resume(job);
1268 static void do_qmp_query_block_jobs_one(void *opaque, BlockDriverState *bs)
1270 BlockJobInfoList **prev = opaque;
1271 BlockJob *job = bs->job;
1273 if (job) {
1274 BlockJobInfoList *elem = g_new0(BlockJobInfoList, 1);
1275 elem->value = block_job_query(bs->job);
1276 (*prev)->next = elem;
1277 *prev = elem;
1281 BlockJobInfoList *qmp_query_block_jobs(Error **errp)
1283 /* Dummy is a fake list element for holding the head pointer */
1284 BlockJobInfoList dummy = {};
1285 BlockJobInfoList *prev = &dummy;
1286 bdrv_iterate(do_qmp_query_block_jobs_one, &prev);
1287 return dummy.next;