xref: /openbmc/qemu/blockdev.c (revision 1cf9412b)
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  * This file incorporates work covered by the following copyright and
10  * permission notice:
11  *
12  * Copyright (c) 2003-2008 Fabrice Bellard
13  *
14  * Permission is hereby granted, free of charge, to any person obtaining a copy
15  * of this software and associated documentation files (the "Software"), to deal
16  * in the Software without restriction, including without limitation the rights
17  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
18  * copies of the Software, and to permit persons to whom the Software is
19  * furnished to do so, subject to the following conditions:
20  *
21  * The above copyright notice and this permission notice shall be included in
22  * all copies or substantial portions of the Software.
23  *
24  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
25  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
26  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
27  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
28  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
29  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
30  * THE SOFTWARE.
31  */
32 
33 #include "sysemu/blockdev.h"
34 #include "hw/block/block.h"
35 #include "block/blockjob.h"
36 #include "monitor/monitor.h"
37 #include "qapi/qmp/qerror.h"
38 #include "qemu/option.h"
39 #include "qemu/config-file.h"
40 #include "qapi/qmp/types.h"
41 #include "sysemu/sysemu.h"
42 #include "block/block_int.h"
43 #include "qmp-commands.h"
44 #include "trace.h"
45 #include "sysemu/arch_init.h"
46 
47 static QTAILQ_HEAD(drivelist, DriveInfo) drives = QTAILQ_HEAD_INITIALIZER(drives);
48 extern QemuOptsList qemu_common_drive_opts;
49 
50 static const char *const if_name[IF_COUNT] = {
51     [IF_NONE] = "none",
52     [IF_IDE] = "ide",
53     [IF_SCSI] = "scsi",
54     [IF_FLOPPY] = "floppy",
55     [IF_PFLASH] = "pflash",
56     [IF_MTD] = "mtd",
57     [IF_SD] = "sd",
58     [IF_VIRTIO] = "virtio",
59     [IF_XEN] = "xen",
60 };
61 
62 static const int if_max_devs[IF_COUNT] = {
63     /*
64      * Do not change these numbers!  They govern how drive option
65      * index maps to unit and bus.  That mapping is ABI.
66      *
67      * All controllers used to imlement if=T drives need to support
68      * if_max_devs[T] units, for any T with if_max_devs[T] != 0.
69      * Otherwise, some index values map to "impossible" bus, unit
70      * values.
71      *
72      * For instance, if you change [IF_SCSI] to 255, -drive
73      * if=scsi,index=12 no longer means bus=1,unit=5, but
74      * bus=0,unit=12.  With an lsi53c895a controller (7 units max),
75      * the drive can't be set up.  Regression.
76      */
77     [IF_IDE] = 2,
78     [IF_SCSI] = 7,
79 };
80 
81 /*
82  * We automatically delete the drive when a device using it gets
83  * unplugged.  Questionable feature, but we can't just drop it.
84  * Device models call blockdev_mark_auto_del() to schedule the
85  * automatic deletion, and generic qdev code calls blockdev_auto_del()
86  * when deletion is actually safe.
87  */
88 void blockdev_mark_auto_del(BlockDriverState *bs)
89 {
90     DriveInfo *dinfo = drive_get_by_blockdev(bs);
91 
92     if (bs->job) {
93         block_job_cancel(bs->job);
94     }
95     if (dinfo) {
96         dinfo->auto_del = 1;
97     }
98 }
99 
100 void blockdev_auto_del(BlockDriverState *bs)
101 {
102     DriveInfo *dinfo = drive_get_by_blockdev(bs);
103 
104     if (dinfo && dinfo->auto_del) {
105         drive_put_ref(dinfo);
106     }
107 }
108 
109 static int drive_index_to_bus_id(BlockInterfaceType type, int index)
110 {
111     int max_devs = if_max_devs[type];
112     return max_devs ? index / max_devs : 0;
113 }
114 
115 static int drive_index_to_unit_id(BlockInterfaceType type, int index)
116 {
117     int max_devs = if_max_devs[type];
118     return max_devs ? index % max_devs : index;
119 }
120 
121 QemuOpts *drive_def(const char *optstr)
122 {
123     return qemu_opts_parse(qemu_find_opts("drive"), optstr, 0);
124 }
125 
126 QemuOpts *drive_add(BlockInterfaceType type, int index, const char *file,
127                     const char *optstr)
128 {
129     QemuOpts *opts;
130     char buf[32];
131 
132     opts = drive_def(optstr);
133     if (!opts) {
134         return NULL;
135     }
136     if (type != IF_DEFAULT) {
137         qemu_opt_set(opts, "if", if_name[type]);
138     }
139     if (index >= 0) {
140         snprintf(buf, sizeof(buf), "%d", index);
141         qemu_opt_set(opts, "index", buf);
142     }
143     if (file)
144         qemu_opt_set(opts, "file", file);
145     return opts;
146 }
147 
148 DriveInfo *drive_get(BlockInterfaceType type, int bus, int unit)
149 {
150     DriveInfo *dinfo;
151 
152     /* seek interface, bus and unit */
153 
154     QTAILQ_FOREACH(dinfo, &drives, next) {
155         if (dinfo->type == type &&
156 	    dinfo->bus == bus &&
157 	    dinfo->unit == unit)
158             return dinfo;
159     }
160 
161     return NULL;
162 }
163 
164 DriveInfo *drive_get_by_index(BlockInterfaceType type, int index)
165 {
166     return drive_get(type,
167                      drive_index_to_bus_id(type, index),
168                      drive_index_to_unit_id(type, index));
169 }
170 
171 int drive_get_max_bus(BlockInterfaceType type)
172 {
173     int max_bus;
174     DriveInfo *dinfo;
175 
176     max_bus = -1;
177     QTAILQ_FOREACH(dinfo, &drives, next) {
178         if(dinfo->type == type &&
179            dinfo->bus > max_bus)
180             max_bus = dinfo->bus;
181     }
182     return max_bus;
183 }
184 
185 /* Get a block device.  This should only be used for single-drive devices
186    (e.g. SD/Floppy/MTD).  Multi-disk devices (scsi/ide) should use the
187    appropriate bus.  */
188 DriveInfo *drive_get_next(BlockInterfaceType type)
189 {
190     static int next_block_unit[IF_COUNT];
191 
192     return drive_get(type, 0, next_block_unit[type]++);
193 }
194 
195 DriveInfo *drive_get_by_blockdev(BlockDriverState *bs)
196 {
197     DriveInfo *dinfo;
198 
199     QTAILQ_FOREACH(dinfo, &drives, next) {
200         if (dinfo->bdrv == bs) {
201             return dinfo;
202         }
203     }
204     return NULL;
205 }
206 
207 static void bdrv_format_print(void *opaque, const char *name)
208 {
209     error_printf(" %s", name);
210 }
211 
212 static void drive_uninit(DriveInfo *dinfo)
213 {
214     qemu_opts_del(dinfo->opts);
215     bdrv_unref(dinfo->bdrv);
216     g_free(dinfo->id);
217     QTAILQ_REMOVE(&drives, dinfo, next);
218     g_free(dinfo->serial);
219     g_free(dinfo);
220 }
221 
222 void drive_put_ref(DriveInfo *dinfo)
223 {
224     assert(dinfo->refcount);
225     if (--dinfo->refcount == 0) {
226         drive_uninit(dinfo);
227     }
228 }
229 
230 void drive_get_ref(DriveInfo *dinfo)
231 {
232     dinfo->refcount++;
233 }
234 
235 typedef struct {
236     QEMUBH *bh;
237     BlockDriverState *bs;
238 } BDRVPutRefBH;
239 
240 static void bdrv_put_ref_bh(void *opaque)
241 {
242     BDRVPutRefBH *s = opaque;
243 
244     bdrv_unref(s->bs);
245     qemu_bh_delete(s->bh);
246     g_free(s);
247 }
248 
249 /*
250  * Release a BDS reference in a BH
251  *
252  * It is not safe to use bdrv_unref() from a callback function when the callers
253  * still need the BlockDriverState.  In such cases we schedule a BH to release
254  * the reference.
255  */
256 static void bdrv_put_ref_bh_schedule(BlockDriverState *bs)
257 {
258     BDRVPutRefBH *s;
259 
260     s = g_new(BDRVPutRefBH, 1);
261     s->bh = qemu_bh_new(bdrv_put_ref_bh, s);
262     s->bs = bs;
263     qemu_bh_schedule(s->bh);
264 }
265 
266 static int parse_block_error_action(const char *buf, bool is_read)
267 {
268     if (!strcmp(buf, "ignore")) {
269         return BLOCKDEV_ON_ERROR_IGNORE;
270     } else if (!is_read && !strcmp(buf, "enospc")) {
271         return BLOCKDEV_ON_ERROR_ENOSPC;
272     } else if (!strcmp(buf, "stop")) {
273         return BLOCKDEV_ON_ERROR_STOP;
274     } else if (!strcmp(buf, "report")) {
275         return BLOCKDEV_ON_ERROR_REPORT;
276     } else {
277         error_report("'%s' invalid %s error action",
278                      buf, is_read ? "read" : "write");
279         return -1;
280     }
281 }
282 
283 static bool check_throttle_config(ThrottleConfig *cfg, Error **errp)
284 {
285     if (throttle_conflicting(cfg)) {
286         error_setg(errp, "bps/iops/max total values and read/write values"
287                          " cannot be used at the same time");
288         return false;
289     }
290 
291     if (!throttle_is_valid(cfg)) {
292         error_setg(errp, "bps/iops/maxs values must be 0 or greater");
293         return false;
294     }
295 
296     return true;
297 }
298 
299 static DriveInfo *blockdev_init(QemuOpts *all_opts,
300                                 BlockInterfaceType block_default_type)
301 {
302     const char *buf;
303     const char *file = NULL;
304     const char *serial;
305     const char *mediastr = "";
306     BlockInterfaceType type;
307     enum { MEDIA_DISK, MEDIA_CDROM } media;
308     int bus_id, unit_id;
309     int cyls, heads, secs, translation;
310     int max_devs;
311     int index;
312     int ro = 0;
313     int bdrv_flags = 0;
314     int on_read_error, on_write_error;
315     const char *devaddr;
316     DriveInfo *dinfo;
317     ThrottleConfig cfg;
318     int snapshot = 0;
319     bool copy_on_read;
320     int ret;
321     Error *error = NULL;
322     QemuOpts *opts;
323     QDict *bs_opts;
324     const char *id;
325     bool has_driver_specific_opts;
326     BlockDriver *drv = NULL;
327 
328     translation = BIOS_ATA_TRANSLATION_AUTO;
329     media = MEDIA_DISK;
330 
331     /* Check common options by copying from all_opts to opts, all other options
332      * are stored in bs_opts. */
333     id = qemu_opts_id(all_opts);
334     opts = qemu_opts_create(&qemu_common_drive_opts, id, 1, &error);
335     if (error_is_set(&error)) {
336         qerror_report_err(error);
337         error_free(error);
338         return NULL;
339     }
340 
341     bs_opts = qdict_new();
342     qemu_opts_to_qdict(all_opts, bs_opts);
343     qemu_opts_absorb_qdict(opts, bs_opts, &error);
344     if (error_is_set(&error)) {
345         qerror_report_err(error);
346         error_free(error);
347         return NULL;
348     }
349 
350     if (id) {
351         qdict_del(bs_opts, "id");
352     }
353 
354     has_driver_specific_opts = !!qdict_size(bs_opts);
355 
356     /* extract parameters */
357     bus_id  = qemu_opt_get_number(opts, "bus", 0);
358     unit_id = qemu_opt_get_number(opts, "unit", -1);
359     index   = qemu_opt_get_number(opts, "index", -1);
360 
361     cyls  = qemu_opt_get_number(opts, "cyls", 0);
362     heads = qemu_opt_get_number(opts, "heads", 0);
363     secs  = qemu_opt_get_number(opts, "secs", 0);
364 
365     snapshot = qemu_opt_get_bool(opts, "snapshot", 0);
366     ro = qemu_opt_get_bool(opts, "read-only", 0);
367     copy_on_read = qemu_opt_get_bool(opts, "copy-on-read", false);
368 
369     file = qemu_opt_get(opts, "file");
370     serial = qemu_opt_get(opts, "serial");
371 
372     if ((buf = qemu_opt_get(opts, "if")) != NULL) {
373         for (type = 0; type < IF_COUNT && strcmp(buf, if_name[type]); type++)
374             ;
375         if (type == IF_COUNT) {
376             error_report("unsupported bus type '%s'", buf);
377             return NULL;
378 	}
379     } else {
380         type = block_default_type;
381     }
382 
383     max_devs = if_max_devs[type];
384 
385     if (cyls || heads || secs) {
386         if (cyls < 1) {
387             error_report("invalid physical cyls number");
388 	    return NULL;
389 	}
390         if (heads < 1) {
391             error_report("invalid physical heads number");
392 	    return NULL;
393 	}
394         if (secs < 1) {
395             error_report("invalid physical secs number");
396 	    return NULL;
397 	}
398     }
399 
400     if ((buf = qemu_opt_get(opts, "trans")) != NULL) {
401         if (!cyls) {
402             error_report("'%s' trans must be used with cyls, heads and secs",
403                          buf);
404             return NULL;
405         }
406         if (!strcmp(buf, "none"))
407             translation = BIOS_ATA_TRANSLATION_NONE;
408         else if (!strcmp(buf, "lba"))
409             translation = BIOS_ATA_TRANSLATION_LBA;
410         else if (!strcmp(buf, "auto"))
411             translation = BIOS_ATA_TRANSLATION_AUTO;
412 	else {
413             error_report("'%s' invalid translation type", buf);
414 	    return NULL;
415 	}
416     }
417 
418     if ((buf = qemu_opt_get(opts, "media")) != NULL) {
419         if (!strcmp(buf, "disk")) {
420 	    media = MEDIA_DISK;
421 	} else if (!strcmp(buf, "cdrom")) {
422             if (cyls || secs || heads) {
423                 error_report("CHS can't be set with media=%s", buf);
424 	        return NULL;
425             }
426 	    media = MEDIA_CDROM;
427 	} else {
428 	    error_report("'%s' invalid media", buf);
429 	    return NULL;
430 	}
431     }
432 
433     if ((buf = qemu_opt_get(opts, "discard")) != NULL) {
434         if (bdrv_parse_discard_flags(buf, &bdrv_flags) != 0) {
435             error_report("invalid discard option");
436             return NULL;
437         }
438     }
439 
440     if (qemu_opt_get_bool(opts, "cache.writeback", true)) {
441         bdrv_flags |= BDRV_O_CACHE_WB;
442     }
443     if (qemu_opt_get_bool(opts, "cache.direct", false)) {
444         bdrv_flags |= BDRV_O_NOCACHE;
445     }
446     if (qemu_opt_get_bool(opts, "cache.no-flush", false)) {
447         bdrv_flags |= BDRV_O_NO_FLUSH;
448     }
449 
450 #ifdef CONFIG_LINUX_AIO
451     if ((buf = qemu_opt_get(opts, "aio")) != NULL) {
452         if (!strcmp(buf, "native")) {
453             bdrv_flags |= BDRV_O_NATIVE_AIO;
454         } else if (!strcmp(buf, "threads")) {
455             /* this is the default */
456         } else {
457            error_report("invalid aio option");
458            return NULL;
459         }
460     }
461 #endif
462 
463     if ((buf = qemu_opt_get(opts, "format")) != NULL) {
464         if (is_help_option(buf)) {
465             error_printf("Supported formats:");
466             bdrv_iterate_format(bdrv_format_print, NULL);
467             error_printf("\n");
468             return NULL;
469         }
470 
471         drv = bdrv_find_whitelisted_format(buf, ro);
472         if (!drv) {
473             if (!ro && bdrv_find_whitelisted_format(buf, !ro)) {
474                 error_report("'%s' can be only used as read-only device.", buf);
475             } else {
476                 error_report("'%s' invalid format", buf);
477             }
478             return NULL;
479         }
480     }
481 
482     /* disk I/O throttling */
483     memset(&cfg, 0, sizeof(cfg));
484     cfg.buckets[THROTTLE_BPS_TOTAL].avg =
485         qemu_opt_get_number(opts, "throttling.bps-total", 0);
486     cfg.buckets[THROTTLE_BPS_READ].avg  =
487         qemu_opt_get_number(opts, "throttling.bps-read", 0);
488     cfg.buckets[THROTTLE_BPS_WRITE].avg =
489         qemu_opt_get_number(opts, "throttling.bps-write", 0);
490     cfg.buckets[THROTTLE_OPS_TOTAL].avg =
491         qemu_opt_get_number(opts, "throttling.iops-total", 0);
492     cfg.buckets[THROTTLE_OPS_READ].avg =
493         qemu_opt_get_number(opts, "throttling.iops-read", 0);
494     cfg.buckets[THROTTLE_OPS_WRITE].avg =
495         qemu_opt_get_number(opts, "throttling.iops-write", 0);
496 
497     cfg.buckets[THROTTLE_BPS_TOTAL].max =
498         qemu_opt_get_number(opts, "throttling.bps-total-max", 0);
499     cfg.buckets[THROTTLE_BPS_READ].max  =
500         qemu_opt_get_number(opts, "throttling.bps-read-max", 0);
501     cfg.buckets[THROTTLE_BPS_WRITE].max =
502         qemu_opt_get_number(opts, "throttling.bps-write-max", 0);
503     cfg.buckets[THROTTLE_OPS_TOTAL].max =
504         qemu_opt_get_number(opts, "throttling.iops-total-max", 0);
505     cfg.buckets[THROTTLE_OPS_READ].max =
506         qemu_opt_get_number(opts, "throttling.iops-read-max", 0);
507     cfg.buckets[THROTTLE_OPS_WRITE].max =
508         qemu_opt_get_number(opts, "throttling.iops-write-max", 0);
509 
510     cfg.op_size = qemu_opt_get_number(opts, "throttling.iops-size", 0);
511 
512     if (!check_throttle_config(&cfg, &error)) {
513         error_report("%s", error_get_pretty(error));
514         error_free(error);
515         return NULL;
516     }
517 
518     if (qemu_opt_get(opts, "boot") != NULL) {
519         fprintf(stderr, "qemu-kvm: boot=on|off is deprecated and will be "
520                 "ignored. Future versions will reject this parameter. Please "
521                 "update your scripts.\n");
522     }
523 
524     on_write_error = BLOCKDEV_ON_ERROR_ENOSPC;
525     if ((buf = qemu_opt_get(opts, "werror")) != NULL) {
526         if (type != IF_IDE && type != IF_SCSI && type != IF_VIRTIO && type != IF_NONE) {
527             error_report("werror is not supported by this bus type");
528             return NULL;
529         }
530 
531         on_write_error = parse_block_error_action(buf, 0);
532         if (on_write_error < 0) {
533             return NULL;
534         }
535     }
536 
537     on_read_error = BLOCKDEV_ON_ERROR_REPORT;
538     if ((buf = qemu_opt_get(opts, "rerror")) != NULL) {
539         if (type != IF_IDE && type != IF_VIRTIO && type != IF_SCSI && type != IF_NONE) {
540             error_report("rerror is not supported by this bus type");
541             return NULL;
542         }
543 
544         on_read_error = parse_block_error_action(buf, 1);
545         if (on_read_error < 0) {
546             return NULL;
547         }
548     }
549 
550     if ((devaddr = qemu_opt_get(opts, "addr")) != NULL) {
551         if (type != IF_VIRTIO) {
552             error_report("addr is not supported by this bus type");
553             return NULL;
554         }
555     }
556 
557     /* compute bus and unit according index */
558 
559     if (index != -1) {
560         if (bus_id != 0 || unit_id != -1) {
561             error_report("index cannot be used with bus and unit");
562             return NULL;
563         }
564         bus_id = drive_index_to_bus_id(type, index);
565         unit_id = drive_index_to_unit_id(type, index);
566     }
567 
568     /* if user doesn't specify a unit_id,
569      * try to find the first free
570      */
571 
572     if (unit_id == -1) {
573        unit_id = 0;
574        while (drive_get(type, bus_id, unit_id) != NULL) {
575            unit_id++;
576            if (max_devs && unit_id >= max_devs) {
577                unit_id -= max_devs;
578                bus_id++;
579            }
580        }
581     }
582 
583     /* check unit id */
584 
585     if (max_devs && unit_id >= max_devs) {
586         error_report("unit %d too big (max is %d)",
587                      unit_id, max_devs - 1);
588         return NULL;
589     }
590 
591     /*
592      * catch multiple definitions
593      */
594 
595     if (drive_get(type, bus_id, unit_id) != NULL) {
596         error_report("drive with bus=%d, unit=%d (index=%d) exists",
597                      bus_id, unit_id, index);
598         return NULL;
599     }
600 
601     /* init */
602 
603     dinfo = g_malloc0(sizeof(*dinfo));
604     if ((buf = qemu_opts_id(opts)) != NULL) {
605         dinfo->id = g_strdup(buf);
606     } else {
607         /* no id supplied -> create one */
608         dinfo->id = g_malloc0(32);
609         if (type == IF_IDE || type == IF_SCSI)
610             mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd";
611         if (max_devs)
612             snprintf(dinfo->id, 32, "%s%i%s%i",
613                      if_name[type], bus_id, mediastr, unit_id);
614         else
615             snprintf(dinfo->id, 32, "%s%s%i",
616                      if_name[type], mediastr, unit_id);
617     }
618     dinfo->bdrv = bdrv_new(dinfo->id);
619     dinfo->bdrv->open_flags = snapshot ? BDRV_O_SNAPSHOT : 0;
620     dinfo->bdrv->read_only = ro;
621     dinfo->devaddr = devaddr;
622     dinfo->type = type;
623     dinfo->bus = bus_id;
624     dinfo->unit = unit_id;
625     dinfo->cyls = cyls;
626     dinfo->heads = heads;
627     dinfo->secs = secs;
628     dinfo->trans = translation;
629     dinfo->opts = all_opts;
630     dinfo->refcount = 1;
631     if (serial != NULL) {
632         dinfo->serial = g_strdup(serial);
633     }
634     QTAILQ_INSERT_TAIL(&drives, dinfo, next);
635 
636     bdrv_set_on_error(dinfo->bdrv, on_read_error, on_write_error);
637 
638     /* disk I/O throttling */
639     if (throttle_enabled(&cfg)) {
640         bdrv_io_limits_enable(dinfo->bdrv);
641         bdrv_set_io_limits(dinfo->bdrv, &cfg);
642     }
643 
644     switch(type) {
645     case IF_IDE:
646     case IF_SCSI:
647     case IF_XEN:
648     case IF_NONE:
649         dinfo->media_cd = media == MEDIA_CDROM;
650         break;
651     case IF_SD:
652     case IF_FLOPPY:
653     case IF_PFLASH:
654     case IF_MTD:
655         break;
656     case IF_VIRTIO:
657     {
658         /* add virtio block device */
659         QemuOpts *devopts;
660         devopts = qemu_opts_create_nofail(qemu_find_opts("device"));
661         if (arch_type == QEMU_ARCH_S390X) {
662             qemu_opt_set(devopts, "driver", "virtio-blk-s390");
663         } else {
664             qemu_opt_set(devopts, "driver", "virtio-blk-pci");
665         }
666         qemu_opt_set(devopts, "drive", dinfo->id);
667         if (devaddr)
668             qemu_opt_set(devopts, "addr", devaddr);
669         break;
670     }
671     default:
672         abort();
673     }
674     if (!file || !*file) {
675         if (has_driver_specific_opts) {
676             file = NULL;
677         } else {
678             return dinfo;
679         }
680     }
681     if (snapshot) {
682         /* always use cache=unsafe with snapshot */
683         bdrv_flags &= ~BDRV_O_CACHE_MASK;
684         bdrv_flags |= (BDRV_O_SNAPSHOT|BDRV_O_CACHE_WB|BDRV_O_NO_FLUSH);
685     }
686 
687     if (copy_on_read) {
688         bdrv_flags |= BDRV_O_COPY_ON_READ;
689     }
690 
691     if (runstate_check(RUN_STATE_INMIGRATE)) {
692         bdrv_flags |= BDRV_O_INCOMING;
693     }
694 
695     if (media == MEDIA_CDROM) {
696         /* CDROM is fine for any interface, don't check.  */
697         ro = 1;
698     } else if (ro == 1) {
699         if (type != IF_SCSI && type != IF_VIRTIO && type != IF_FLOPPY &&
700             type != IF_NONE && type != IF_PFLASH) {
701             error_report("read-only not supported by this bus type");
702             goto err;
703         }
704     }
705 
706     bdrv_flags |= ro ? 0 : BDRV_O_RDWR;
707 
708     if (ro && copy_on_read) {
709         error_report("warning: disabling copy_on_read on read-only drive");
710     }
711 
712     QINCREF(bs_opts);
713     ret = bdrv_open(dinfo->bdrv, file, bs_opts, bdrv_flags, drv, &error);
714 
715     if (ret < 0) {
716         error_report("could not open disk image %s: %s",
717                      file ?: dinfo->id, error_get_pretty(error));
718         goto err;
719     }
720 
721     if (bdrv_key_required(dinfo->bdrv))
722         autostart = 0;
723 
724     QDECREF(bs_opts);
725     qemu_opts_del(opts);
726 
727     return dinfo;
728 
729 err:
730     qemu_opts_del(opts);
731     QDECREF(bs_opts);
732     bdrv_unref(dinfo->bdrv);
733     g_free(dinfo->id);
734     QTAILQ_REMOVE(&drives, dinfo, next);
735     g_free(dinfo);
736     return NULL;
737 }
738 
739 static void qemu_opt_rename(QemuOpts *opts, const char *from, const char *to)
740 {
741     const char *value;
742 
743     value = qemu_opt_get(opts, from);
744     if (value) {
745         qemu_opt_set(opts, to, value);
746         qemu_opt_unset(opts, from);
747     }
748 }
749 
750 DriveInfo *drive_init(QemuOpts *all_opts, BlockInterfaceType block_default_type)
751 {
752     const char *value;
753 
754     /* Change legacy command line options into QMP ones */
755     qemu_opt_rename(all_opts, "iops", "throttling.iops-total");
756     qemu_opt_rename(all_opts, "iops_rd", "throttling.iops-read");
757     qemu_opt_rename(all_opts, "iops_wr", "throttling.iops-write");
758 
759     qemu_opt_rename(all_opts, "bps", "throttling.bps-total");
760     qemu_opt_rename(all_opts, "bps_rd", "throttling.bps-read");
761     qemu_opt_rename(all_opts, "bps_wr", "throttling.bps-write");
762 
763     qemu_opt_rename(all_opts, "iops_max", "throttling.iops-total-max");
764     qemu_opt_rename(all_opts, "iops_rd_max", "throttling.iops-read-max");
765     qemu_opt_rename(all_opts, "iops_wr_max", "throttling.iops-write-max");
766 
767     qemu_opt_rename(all_opts, "bps_max", "throttling.bps-total-max");
768     qemu_opt_rename(all_opts, "bps_rd_max", "throttling.bps-read-max");
769     qemu_opt_rename(all_opts, "bps_wr_max", "throttling.bps-write-max");
770 
771     qemu_opt_rename(all_opts,
772                     "iops_size", "throttling.iops-size");
773 
774     qemu_opt_rename(all_opts, "readonly", "read-only");
775 
776     value = qemu_opt_get(all_opts, "cache");
777     if (value) {
778         int flags = 0;
779 
780         if (bdrv_parse_cache_flags(value, &flags) != 0) {
781             error_report("invalid cache option");
782             return NULL;
783         }
784 
785         /* Specific options take precedence */
786         if (!qemu_opt_get(all_opts, "cache.writeback")) {
787             qemu_opt_set_bool(all_opts, "cache.writeback",
788                               !!(flags & BDRV_O_CACHE_WB));
789         }
790         if (!qemu_opt_get(all_opts, "cache.direct")) {
791             qemu_opt_set_bool(all_opts, "cache.direct",
792                               !!(flags & BDRV_O_NOCACHE));
793         }
794         if (!qemu_opt_get(all_opts, "cache.no-flush")) {
795             qemu_opt_set_bool(all_opts, "cache.no-flush",
796                               !!(flags & BDRV_O_NO_FLUSH));
797         }
798         qemu_opt_unset(all_opts, "cache");
799     }
800 
801     return blockdev_init(all_opts, block_default_type);
802 }
803 
804 void do_commit(Monitor *mon, const QDict *qdict)
805 {
806     const char *device = qdict_get_str(qdict, "device");
807     BlockDriverState *bs;
808     int ret;
809 
810     if (!strcmp(device, "all")) {
811         ret = bdrv_commit_all();
812     } else {
813         bs = bdrv_find(device);
814         if (!bs) {
815             monitor_printf(mon, "Device '%s' not found\n", device);
816             return;
817         }
818         ret = bdrv_commit(bs);
819     }
820     if (ret < 0) {
821         monitor_printf(mon, "'commit' error for '%s': %s\n", device,
822                        strerror(-ret));
823     }
824 }
825 
826 static void blockdev_do_action(int kind, void *data, Error **errp)
827 {
828     TransactionAction action;
829     TransactionActionList list;
830 
831     action.kind = kind;
832     action.data = data;
833     list.value = &action;
834     list.next = NULL;
835     qmp_transaction(&list, errp);
836 }
837 
838 void qmp_blockdev_snapshot_sync(const char *device, const char *snapshot_file,
839                                 bool has_format, const char *format,
840                                 bool has_mode, enum NewImageMode mode,
841                                 Error **errp)
842 {
843     BlockdevSnapshot snapshot = {
844         .device = (char *) device,
845         .snapshot_file = (char *) snapshot_file,
846         .has_format = has_format,
847         .format = (char *) format,
848         .has_mode = has_mode,
849         .mode = mode,
850     };
851     blockdev_do_action(TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC,
852                        &snapshot, errp);
853 }
854 
855 void qmp_blockdev_snapshot_internal_sync(const char *device,
856                                          const char *name,
857                                          Error **errp)
858 {
859     BlockdevSnapshotInternal snapshot = {
860         .device = (char *) device,
861         .name = (char *) name
862     };
863 
864     blockdev_do_action(TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC,
865                        &snapshot, errp);
866 }
867 
868 SnapshotInfo *qmp_blockdev_snapshot_delete_internal_sync(const char *device,
869                                                          bool has_id,
870                                                          const char *id,
871                                                          bool has_name,
872                                                          const char *name,
873                                                          Error **errp)
874 {
875     BlockDriverState *bs = bdrv_find(device);
876     QEMUSnapshotInfo sn;
877     Error *local_err = NULL;
878     SnapshotInfo *info = NULL;
879     int ret;
880 
881     if (!bs) {
882         error_set(errp, QERR_DEVICE_NOT_FOUND, device);
883         return NULL;
884     }
885 
886     if (!has_id) {
887         id = NULL;
888     }
889 
890     if (!has_name) {
891         name = NULL;
892     }
893 
894     if (!id && !name) {
895         error_setg(errp, "Name or id must be provided");
896         return NULL;
897     }
898 
899     ret = bdrv_snapshot_find_by_id_and_name(bs, id, name, &sn, &local_err);
900     if (error_is_set(&local_err)) {
901         error_propagate(errp, local_err);
902         return NULL;
903     }
904     if (!ret) {
905         error_setg(errp,
906                    "Snapshot with id '%s' and name '%s' does not exist on "
907                    "device '%s'",
908                    STR_OR_NULL(id), STR_OR_NULL(name), device);
909         return NULL;
910     }
911 
912     bdrv_snapshot_delete(bs, id, name, &local_err);
913     if (error_is_set(&local_err)) {
914         error_propagate(errp, local_err);
915         return NULL;
916     }
917 
918     info = g_malloc0(sizeof(SnapshotInfo));
919     info->id = g_strdup(sn.id_str);
920     info->name = g_strdup(sn.name);
921     info->date_nsec = sn.date_nsec;
922     info->date_sec = sn.date_sec;
923     info->vm_state_size = sn.vm_state_size;
924     info->vm_clock_nsec = sn.vm_clock_nsec % 1000000000;
925     info->vm_clock_sec = sn.vm_clock_nsec / 1000000000;
926 
927     return info;
928 }
929 
930 /* New and old BlockDriverState structs for group snapshots */
931 
932 typedef struct BlkTransactionState BlkTransactionState;
933 
934 /* Only prepare() may fail. In a single transaction, only one of commit() or
935    abort() will be called, clean() will always be called if it present. */
936 typedef struct BdrvActionOps {
937     /* Size of state struct, in bytes. */
938     size_t instance_size;
939     /* Prepare the work, must NOT be NULL. */
940     void (*prepare)(BlkTransactionState *common, Error **errp);
941     /* Commit the changes, can be NULL. */
942     void (*commit)(BlkTransactionState *common);
943     /* Abort the changes on fail, can be NULL. */
944     void (*abort)(BlkTransactionState *common);
945     /* Clean up resource in the end, can be NULL. */
946     void (*clean)(BlkTransactionState *common);
947 } BdrvActionOps;
948 
949 /*
950  * This structure must be arranged as first member in child type, assuming
951  * that compiler will also arrange it to the same address with parent instance.
952  * Later it will be used in free().
953  */
954 struct BlkTransactionState {
955     TransactionAction *action;
956     const BdrvActionOps *ops;
957     QSIMPLEQ_ENTRY(BlkTransactionState) entry;
958 };
959 
960 /* internal snapshot private data */
961 typedef struct InternalSnapshotState {
962     BlkTransactionState common;
963     BlockDriverState *bs;
964     QEMUSnapshotInfo sn;
965 } InternalSnapshotState;
966 
967 static void internal_snapshot_prepare(BlkTransactionState *common,
968                                       Error **errp)
969 {
970     const char *device;
971     const char *name;
972     BlockDriverState *bs;
973     QEMUSnapshotInfo old_sn, *sn;
974     bool ret;
975     qemu_timeval tv;
976     BlockdevSnapshotInternal *internal;
977     InternalSnapshotState *state;
978     int ret1;
979 
980     g_assert(common->action->kind ==
981              TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC);
982     internal = common->action->blockdev_snapshot_internal_sync;
983     state = DO_UPCAST(InternalSnapshotState, common, common);
984 
985     /* 1. parse input */
986     device = internal->device;
987     name = internal->name;
988 
989     /* 2. check for validation */
990     bs = bdrv_find(device);
991     if (!bs) {
992         error_set(errp, QERR_DEVICE_NOT_FOUND, device);
993         return;
994     }
995 
996     if (!bdrv_is_inserted(bs)) {
997         error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
998         return;
999     }
1000 
1001     if (bdrv_is_read_only(bs)) {
1002         error_set(errp, QERR_DEVICE_IS_READ_ONLY, device);
1003         return;
1004     }
1005 
1006     if (!bdrv_can_snapshot(bs)) {
1007         error_set(errp, QERR_BLOCK_FORMAT_FEATURE_NOT_SUPPORTED,
1008                   bs->drv->format_name, device, "internal snapshot");
1009         return;
1010     }
1011 
1012     if (!strlen(name)) {
1013         error_setg(errp, "Name is empty");
1014         return;
1015     }
1016 
1017     /* check whether a snapshot with name exist */
1018     ret = bdrv_snapshot_find_by_id_and_name(bs, NULL, name, &old_sn, errp);
1019     if (error_is_set(errp)) {
1020         return;
1021     } else if (ret) {
1022         error_setg(errp,
1023                    "Snapshot with name '%s' already exists on device '%s'",
1024                    name, device);
1025         return;
1026     }
1027 
1028     /* 3. take the snapshot */
1029     sn = &state->sn;
1030     pstrcpy(sn->name, sizeof(sn->name), name);
1031     qemu_gettimeofday(&tv);
1032     sn->date_sec = tv.tv_sec;
1033     sn->date_nsec = tv.tv_usec * 1000;
1034     sn->vm_clock_nsec = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
1035 
1036     ret1 = bdrv_snapshot_create(bs, sn);
1037     if (ret1 < 0) {
1038         error_setg_errno(errp, -ret1,
1039                          "Failed to create snapshot '%s' on device '%s'",
1040                          name, device);
1041         return;
1042     }
1043 
1044     /* 4. succeed, mark a snapshot is created */
1045     state->bs = bs;
1046 }
1047 
1048 static void internal_snapshot_abort(BlkTransactionState *common)
1049 {
1050     InternalSnapshotState *state =
1051                              DO_UPCAST(InternalSnapshotState, common, common);
1052     BlockDriverState *bs = state->bs;
1053     QEMUSnapshotInfo *sn = &state->sn;
1054     Error *local_error = NULL;
1055 
1056     if (!bs) {
1057         return;
1058     }
1059 
1060     if (bdrv_snapshot_delete(bs, sn->id_str, sn->name, &local_error) < 0) {
1061         error_report("Failed to delete snapshot with id '%s' and name '%s' on "
1062                      "device '%s' in abort: %s",
1063                      sn->id_str,
1064                      sn->name,
1065                      bdrv_get_device_name(bs),
1066                      error_get_pretty(local_error));
1067         error_free(local_error);
1068     }
1069 }
1070 
1071 /* external snapshot private data */
1072 typedef struct ExternalSnapshotState {
1073     BlkTransactionState common;
1074     BlockDriverState *old_bs;
1075     BlockDriverState *new_bs;
1076 } ExternalSnapshotState;
1077 
1078 static void external_snapshot_prepare(BlkTransactionState *common,
1079                                       Error **errp)
1080 {
1081     BlockDriver *drv;
1082     int flags, ret;
1083     Error *local_err = NULL;
1084     const char *device;
1085     const char *new_image_file;
1086     const char *format = "qcow2";
1087     enum NewImageMode mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
1088     ExternalSnapshotState *state =
1089                              DO_UPCAST(ExternalSnapshotState, common, common);
1090     TransactionAction *action = common->action;
1091 
1092     /* get parameters */
1093     g_assert(action->kind == TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC);
1094 
1095     device = action->blockdev_snapshot_sync->device;
1096     new_image_file = action->blockdev_snapshot_sync->snapshot_file;
1097     if (action->blockdev_snapshot_sync->has_format) {
1098         format = action->blockdev_snapshot_sync->format;
1099     }
1100     if (action->blockdev_snapshot_sync->has_mode) {
1101         mode = action->blockdev_snapshot_sync->mode;
1102     }
1103 
1104     /* start processing */
1105     drv = bdrv_find_format(format);
1106     if (!drv) {
1107         error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
1108         return;
1109     }
1110 
1111     state->old_bs = bdrv_find(device);
1112     if (!state->old_bs) {
1113         error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1114         return;
1115     }
1116 
1117     if (!bdrv_is_inserted(state->old_bs)) {
1118         error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1119         return;
1120     }
1121 
1122     if (bdrv_in_use(state->old_bs)) {
1123         error_set(errp, QERR_DEVICE_IN_USE, device);
1124         return;
1125     }
1126 
1127     if (!bdrv_is_read_only(state->old_bs)) {
1128         if (bdrv_flush(state->old_bs)) {
1129             error_set(errp, QERR_IO_ERROR);
1130             return;
1131         }
1132     }
1133 
1134     flags = state->old_bs->open_flags;
1135 
1136     /* create new image w/backing file */
1137     if (mode != NEW_IMAGE_MODE_EXISTING) {
1138         bdrv_img_create(new_image_file, format,
1139                         state->old_bs->filename,
1140                         state->old_bs->drv->format_name,
1141                         NULL, -1, flags, &local_err, false);
1142         if (error_is_set(&local_err)) {
1143             error_propagate(errp, local_err);
1144             return;
1145         }
1146     }
1147 
1148     /* We will manually add the backing_hd field to the bs later */
1149     state->new_bs = bdrv_new("");
1150     /* TODO Inherit bs->options or only take explicit options with an
1151      * extended QMP command? */
1152     ret = bdrv_open(state->new_bs, new_image_file, NULL,
1153                     flags | BDRV_O_NO_BACKING, drv, &local_err);
1154     if (ret != 0) {
1155         error_propagate(errp, local_err);
1156     }
1157 }
1158 
1159 static void external_snapshot_commit(BlkTransactionState *common)
1160 {
1161     ExternalSnapshotState *state =
1162                              DO_UPCAST(ExternalSnapshotState, common, common);
1163 
1164     /* This removes our old bs and adds the new bs */
1165     bdrv_append(state->new_bs, state->old_bs);
1166     /* We don't need (or want) to use the transactional
1167      * bdrv_reopen_multiple() across all the entries at once, because we
1168      * don't want to abort all of them if one of them fails the reopen */
1169     bdrv_reopen(state->new_bs, state->new_bs->open_flags & ~BDRV_O_RDWR,
1170                 NULL);
1171 }
1172 
1173 static void external_snapshot_abort(BlkTransactionState *common)
1174 {
1175     ExternalSnapshotState *state =
1176                              DO_UPCAST(ExternalSnapshotState, common, common);
1177     if (state->new_bs) {
1178         bdrv_unref(state->new_bs);
1179     }
1180 }
1181 
1182 typedef struct DriveBackupState {
1183     BlkTransactionState common;
1184     BlockDriverState *bs;
1185     BlockJob *job;
1186 } DriveBackupState;
1187 
1188 static void drive_backup_prepare(BlkTransactionState *common, Error **errp)
1189 {
1190     DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1191     DriveBackup *backup;
1192     Error *local_err = NULL;
1193 
1194     assert(common->action->kind == TRANSACTION_ACTION_KIND_DRIVE_BACKUP);
1195     backup = common->action->drive_backup;
1196 
1197     qmp_drive_backup(backup->device, backup->target,
1198                      backup->has_format, backup->format,
1199                      backup->sync,
1200                      backup->has_mode, backup->mode,
1201                      backup->has_speed, backup->speed,
1202                      backup->has_on_source_error, backup->on_source_error,
1203                      backup->has_on_target_error, backup->on_target_error,
1204                      &local_err);
1205     if (error_is_set(&local_err)) {
1206         error_propagate(errp, local_err);
1207         state->bs = NULL;
1208         state->job = NULL;
1209         return;
1210     }
1211 
1212     state->bs = bdrv_find(backup->device);
1213     state->job = state->bs->job;
1214 }
1215 
1216 static void drive_backup_abort(BlkTransactionState *common)
1217 {
1218     DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1219     BlockDriverState *bs = state->bs;
1220 
1221     /* Only cancel if it's the job we started */
1222     if (bs && bs->job && bs->job == state->job) {
1223         block_job_cancel_sync(bs->job);
1224     }
1225 }
1226 
1227 static void abort_prepare(BlkTransactionState *common, Error **errp)
1228 {
1229     error_setg(errp, "Transaction aborted using Abort action");
1230 }
1231 
1232 static void abort_commit(BlkTransactionState *common)
1233 {
1234     g_assert_not_reached(); /* this action never succeeds */
1235 }
1236 
1237 static const BdrvActionOps actions[] = {
1238     [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC] = {
1239         .instance_size = sizeof(ExternalSnapshotState),
1240         .prepare  = external_snapshot_prepare,
1241         .commit   = external_snapshot_commit,
1242         .abort = external_snapshot_abort,
1243     },
1244     [TRANSACTION_ACTION_KIND_DRIVE_BACKUP] = {
1245         .instance_size = sizeof(DriveBackupState),
1246         .prepare = drive_backup_prepare,
1247         .abort = drive_backup_abort,
1248     },
1249     [TRANSACTION_ACTION_KIND_ABORT] = {
1250         .instance_size = sizeof(BlkTransactionState),
1251         .prepare = abort_prepare,
1252         .commit = abort_commit,
1253     },
1254     [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC] = {
1255         .instance_size = sizeof(InternalSnapshotState),
1256         .prepare  = internal_snapshot_prepare,
1257         .abort = internal_snapshot_abort,
1258     },
1259 };
1260 
1261 /*
1262  * 'Atomic' group snapshots.  The snapshots are taken as a set, and if any fail
1263  *  then we do not pivot any of the devices in the group, and abandon the
1264  *  snapshots
1265  */
1266 void qmp_transaction(TransactionActionList *dev_list, Error **errp)
1267 {
1268     TransactionActionList *dev_entry = dev_list;
1269     BlkTransactionState *state, *next;
1270     Error *local_err = NULL;
1271 
1272     QSIMPLEQ_HEAD(snap_bdrv_states, BlkTransactionState) snap_bdrv_states;
1273     QSIMPLEQ_INIT(&snap_bdrv_states);
1274 
1275     /* drain all i/o before any snapshots */
1276     bdrv_drain_all();
1277 
1278     /* We don't do anything in this loop that commits us to the snapshot */
1279     while (NULL != dev_entry) {
1280         TransactionAction *dev_info = NULL;
1281         const BdrvActionOps *ops;
1282 
1283         dev_info = dev_entry->value;
1284         dev_entry = dev_entry->next;
1285 
1286         assert(dev_info->kind < ARRAY_SIZE(actions));
1287 
1288         ops = &actions[dev_info->kind];
1289         assert(ops->instance_size > 0);
1290 
1291         state = g_malloc0(ops->instance_size);
1292         state->ops = ops;
1293         state->action = dev_info;
1294         QSIMPLEQ_INSERT_TAIL(&snap_bdrv_states, state, entry);
1295 
1296         state->ops->prepare(state, &local_err);
1297         if (error_is_set(&local_err)) {
1298             error_propagate(errp, local_err);
1299             goto delete_and_fail;
1300         }
1301     }
1302 
1303     QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) {
1304         if (state->ops->commit) {
1305             state->ops->commit(state);
1306         }
1307     }
1308 
1309     /* success */
1310     goto exit;
1311 
1312 delete_and_fail:
1313     /*
1314     * failure, and it is all-or-none; abandon each new bs, and keep using
1315     * the original bs for all images
1316     */
1317     QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) {
1318         if (state->ops->abort) {
1319             state->ops->abort(state);
1320         }
1321     }
1322 exit:
1323     QSIMPLEQ_FOREACH_SAFE(state, &snap_bdrv_states, entry, next) {
1324         if (state->ops->clean) {
1325             state->ops->clean(state);
1326         }
1327         g_free(state);
1328     }
1329 }
1330 
1331 
1332 static void eject_device(BlockDriverState *bs, int force, Error **errp)
1333 {
1334     if (bdrv_in_use(bs)) {
1335         error_set(errp, QERR_DEVICE_IN_USE, bdrv_get_device_name(bs));
1336         return;
1337     }
1338     if (!bdrv_dev_has_removable_media(bs)) {
1339         error_set(errp, QERR_DEVICE_NOT_REMOVABLE, bdrv_get_device_name(bs));
1340         return;
1341     }
1342 
1343     if (bdrv_dev_is_medium_locked(bs) && !bdrv_dev_is_tray_open(bs)) {
1344         bdrv_dev_eject_request(bs, force);
1345         if (!force) {
1346             error_set(errp, QERR_DEVICE_LOCKED, bdrv_get_device_name(bs));
1347             return;
1348         }
1349     }
1350 
1351     bdrv_close(bs);
1352 }
1353 
1354 void qmp_eject(const char *device, bool has_force, bool force, Error **errp)
1355 {
1356     BlockDriverState *bs;
1357 
1358     bs = bdrv_find(device);
1359     if (!bs) {
1360         error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1361         return;
1362     }
1363 
1364     eject_device(bs, force, errp);
1365 }
1366 
1367 void qmp_block_passwd(const char *device, const char *password, Error **errp)
1368 {
1369     BlockDriverState *bs;
1370     int err;
1371 
1372     bs = bdrv_find(device);
1373     if (!bs) {
1374         error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1375         return;
1376     }
1377 
1378     err = bdrv_set_key(bs, password);
1379     if (err == -EINVAL) {
1380         error_set(errp, QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs));
1381         return;
1382     } else if (err < 0) {
1383         error_set(errp, QERR_INVALID_PASSWORD);
1384         return;
1385     }
1386 }
1387 
1388 static void qmp_bdrv_open_encrypted(BlockDriverState *bs, const char *filename,
1389                                     int bdrv_flags, BlockDriver *drv,
1390                                     const char *password, Error **errp)
1391 {
1392     Error *local_err = NULL;
1393     int ret;
1394 
1395     ret = bdrv_open(bs, filename, NULL, bdrv_flags, drv, &local_err);
1396     if (ret < 0) {
1397         error_propagate(errp, local_err);
1398         return;
1399     }
1400 
1401     if (bdrv_key_required(bs)) {
1402         if (password) {
1403             if (bdrv_set_key(bs, password) < 0) {
1404                 error_set(errp, QERR_INVALID_PASSWORD);
1405             }
1406         } else {
1407             error_set(errp, QERR_DEVICE_ENCRYPTED, bdrv_get_device_name(bs),
1408                       bdrv_get_encrypted_filename(bs));
1409         }
1410     } else if (password) {
1411         error_set(errp, QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs));
1412     }
1413 }
1414 
1415 void qmp_change_blockdev(const char *device, const char *filename,
1416                          bool has_format, const char *format, Error **errp)
1417 {
1418     BlockDriverState *bs;
1419     BlockDriver *drv = NULL;
1420     int bdrv_flags;
1421     Error *err = NULL;
1422 
1423     bs = bdrv_find(device);
1424     if (!bs) {
1425         error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1426         return;
1427     }
1428 
1429     if (format) {
1430         drv = bdrv_find_whitelisted_format(format, bs->read_only);
1431         if (!drv) {
1432             error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
1433             return;
1434         }
1435     }
1436 
1437     eject_device(bs, 0, &err);
1438     if (error_is_set(&err)) {
1439         error_propagate(errp, err);
1440         return;
1441     }
1442 
1443     bdrv_flags = bdrv_is_read_only(bs) ? 0 : BDRV_O_RDWR;
1444     bdrv_flags |= bdrv_is_snapshot(bs) ? BDRV_O_SNAPSHOT : 0;
1445 
1446     qmp_bdrv_open_encrypted(bs, filename, bdrv_flags, drv, NULL, errp);
1447 }
1448 
1449 /* throttling disk I/O limits */
1450 void qmp_block_set_io_throttle(const char *device, int64_t bps, int64_t bps_rd,
1451                                int64_t bps_wr,
1452                                int64_t iops,
1453                                int64_t iops_rd,
1454                                int64_t iops_wr,
1455                                bool has_bps_max,
1456                                int64_t bps_max,
1457                                bool has_bps_rd_max,
1458                                int64_t bps_rd_max,
1459                                bool has_bps_wr_max,
1460                                int64_t bps_wr_max,
1461                                bool has_iops_max,
1462                                int64_t iops_max,
1463                                bool has_iops_rd_max,
1464                                int64_t iops_rd_max,
1465                                bool has_iops_wr_max,
1466                                int64_t iops_wr_max,
1467                                bool has_iops_size,
1468                                int64_t iops_size, Error **errp)
1469 {
1470     ThrottleConfig cfg;
1471     BlockDriverState *bs;
1472 
1473     bs = bdrv_find(device);
1474     if (!bs) {
1475         error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1476         return;
1477     }
1478 
1479     memset(&cfg, 0, sizeof(cfg));
1480     cfg.buckets[THROTTLE_BPS_TOTAL].avg = bps;
1481     cfg.buckets[THROTTLE_BPS_READ].avg  = bps_rd;
1482     cfg.buckets[THROTTLE_BPS_WRITE].avg = bps_wr;
1483 
1484     cfg.buckets[THROTTLE_OPS_TOTAL].avg = iops;
1485     cfg.buckets[THROTTLE_OPS_READ].avg  = iops_rd;
1486     cfg.buckets[THROTTLE_OPS_WRITE].avg = iops_wr;
1487 
1488     if (has_bps_max) {
1489         cfg.buckets[THROTTLE_BPS_TOTAL].max = bps_max;
1490     }
1491     if (has_bps_rd_max) {
1492         cfg.buckets[THROTTLE_BPS_READ].max = bps_rd_max;
1493     }
1494     if (has_bps_wr_max) {
1495         cfg.buckets[THROTTLE_BPS_WRITE].max = bps_wr_max;
1496     }
1497     if (has_iops_max) {
1498         cfg.buckets[THROTTLE_OPS_TOTAL].max = iops_max;
1499     }
1500     if (has_iops_rd_max) {
1501         cfg.buckets[THROTTLE_OPS_READ].max = iops_rd_max;
1502     }
1503     if (has_iops_wr_max) {
1504         cfg.buckets[THROTTLE_OPS_WRITE].max = iops_wr_max;
1505     }
1506 
1507     if (has_iops_size) {
1508         cfg.op_size = iops_size;
1509     }
1510 
1511     if (!check_throttle_config(&cfg, errp)) {
1512         return;
1513     }
1514 
1515     if (!bs->io_limits_enabled && throttle_enabled(&cfg)) {
1516         bdrv_io_limits_enable(bs);
1517     } else if (bs->io_limits_enabled && !throttle_enabled(&cfg)) {
1518         bdrv_io_limits_disable(bs);
1519     }
1520 
1521     if (bs->io_limits_enabled) {
1522         bdrv_set_io_limits(bs, &cfg);
1523     }
1524 }
1525 
1526 int do_drive_del(Monitor *mon, const QDict *qdict, QObject **ret_data)
1527 {
1528     const char *id = qdict_get_str(qdict, "id");
1529     BlockDriverState *bs;
1530 
1531     bs = bdrv_find(id);
1532     if (!bs) {
1533         qerror_report(QERR_DEVICE_NOT_FOUND, id);
1534         return -1;
1535     }
1536     if (bdrv_in_use(bs)) {
1537         qerror_report(QERR_DEVICE_IN_USE, id);
1538         return -1;
1539     }
1540 
1541     /* quiesce block driver; prevent further io */
1542     bdrv_drain_all();
1543     bdrv_flush(bs);
1544     bdrv_close(bs);
1545 
1546     /* if we have a device attached to this BlockDriverState
1547      * then we need to make the drive anonymous until the device
1548      * can be removed.  If this is a drive with no device backing
1549      * then we can just get rid of the block driver state right here.
1550      */
1551     if (bdrv_get_attached_dev(bs)) {
1552         bdrv_make_anon(bs);
1553 
1554         /* Further I/O must not pause the guest */
1555         bdrv_set_on_error(bs, BLOCKDEV_ON_ERROR_REPORT,
1556                           BLOCKDEV_ON_ERROR_REPORT);
1557     } else {
1558         drive_uninit(drive_get_by_blockdev(bs));
1559     }
1560 
1561     return 0;
1562 }
1563 
1564 void qmp_block_resize(const char *device, int64_t size, Error **errp)
1565 {
1566     BlockDriverState *bs;
1567     int ret;
1568 
1569     bs = bdrv_find(device);
1570     if (!bs) {
1571         error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1572         return;
1573     }
1574 
1575     if (size < 0) {
1576         error_set(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size");
1577         return;
1578     }
1579 
1580     /* complete all in-flight operations before resizing the device */
1581     bdrv_drain_all();
1582 
1583     ret = bdrv_truncate(bs, size);
1584     switch (ret) {
1585     case 0:
1586         break;
1587     case -ENOMEDIUM:
1588         error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1589         break;
1590     case -ENOTSUP:
1591         error_set(errp, QERR_UNSUPPORTED);
1592         break;
1593     case -EACCES:
1594         error_set(errp, QERR_DEVICE_IS_READ_ONLY, device);
1595         break;
1596     case -EBUSY:
1597         error_set(errp, QERR_DEVICE_IN_USE, device);
1598         break;
1599     default:
1600         error_setg_errno(errp, -ret, "Could not resize");
1601         break;
1602     }
1603 }
1604 
1605 static void block_job_cb(void *opaque, int ret)
1606 {
1607     BlockDriverState *bs = opaque;
1608     QObject *obj;
1609 
1610     trace_block_job_cb(bs, bs->job, ret);
1611 
1612     assert(bs->job);
1613     obj = qobject_from_block_job(bs->job);
1614     if (ret < 0) {
1615         QDict *dict = qobject_to_qdict(obj);
1616         qdict_put(dict, "error", qstring_from_str(strerror(-ret)));
1617     }
1618 
1619     if (block_job_is_cancelled(bs->job)) {
1620         monitor_protocol_event(QEVENT_BLOCK_JOB_CANCELLED, obj);
1621     } else {
1622         monitor_protocol_event(QEVENT_BLOCK_JOB_COMPLETED, obj);
1623     }
1624     qobject_decref(obj);
1625 
1626     bdrv_put_ref_bh_schedule(bs);
1627 }
1628 
1629 void qmp_block_stream(const char *device, bool has_base,
1630                       const char *base, bool has_speed, int64_t speed,
1631                       bool has_on_error, BlockdevOnError on_error,
1632                       Error **errp)
1633 {
1634     BlockDriverState *bs;
1635     BlockDriverState *base_bs = NULL;
1636     Error *local_err = NULL;
1637 
1638     if (!has_on_error) {
1639         on_error = BLOCKDEV_ON_ERROR_REPORT;
1640     }
1641 
1642     bs = bdrv_find(device);
1643     if (!bs) {
1644         error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1645         return;
1646     }
1647 
1648     if (base) {
1649         base_bs = bdrv_find_backing_image(bs, base);
1650         if (base_bs == NULL) {
1651             error_set(errp, QERR_BASE_NOT_FOUND, base);
1652             return;
1653         }
1654     }
1655 
1656     stream_start(bs, base_bs, base, has_speed ? speed : 0,
1657                  on_error, block_job_cb, bs, &local_err);
1658     if (error_is_set(&local_err)) {
1659         error_propagate(errp, local_err);
1660         return;
1661     }
1662 
1663     trace_qmp_block_stream(bs, bs->job);
1664 }
1665 
1666 void qmp_block_commit(const char *device,
1667                       bool has_base, const char *base, const char *top,
1668                       bool has_speed, int64_t speed,
1669                       Error **errp)
1670 {
1671     BlockDriverState *bs;
1672     BlockDriverState *base_bs, *top_bs;
1673     Error *local_err = NULL;
1674     /* This will be part of the QMP command, if/when the
1675      * BlockdevOnError change for blkmirror makes it in
1676      */
1677     BlockdevOnError on_error = BLOCKDEV_ON_ERROR_REPORT;
1678 
1679     /* drain all i/o before commits */
1680     bdrv_drain_all();
1681 
1682     bs = bdrv_find(device);
1683     if (!bs) {
1684         error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1685         return;
1686     }
1687 
1688     /* default top_bs is the active layer */
1689     top_bs = bs;
1690 
1691     if (top) {
1692         if (strcmp(bs->filename, top) != 0) {
1693             top_bs = bdrv_find_backing_image(bs, top);
1694         }
1695     }
1696 
1697     if (top_bs == NULL) {
1698         error_setg(errp, "Top image file %s not found", top ? top : "NULL");
1699         return;
1700     }
1701 
1702     if (has_base && base) {
1703         base_bs = bdrv_find_backing_image(top_bs, base);
1704     } else {
1705         base_bs = bdrv_find_base(top_bs);
1706     }
1707 
1708     if (base_bs == NULL) {
1709         error_set(errp, QERR_BASE_NOT_FOUND, base ? base : "NULL");
1710         return;
1711     }
1712 
1713     commit_start(bs, base_bs, top_bs, speed, on_error, block_job_cb, bs,
1714                 &local_err);
1715     if (local_err != NULL) {
1716         error_propagate(errp, local_err);
1717         return;
1718     }
1719 }
1720 
1721 void qmp_drive_backup(const char *device, const char *target,
1722                       bool has_format, const char *format,
1723                       enum MirrorSyncMode sync,
1724                       bool has_mode, enum NewImageMode mode,
1725                       bool has_speed, int64_t speed,
1726                       bool has_on_source_error, BlockdevOnError on_source_error,
1727                       bool has_on_target_error, BlockdevOnError on_target_error,
1728                       Error **errp)
1729 {
1730     BlockDriverState *bs;
1731     BlockDriverState *target_bs;
1732     BlockDriverState *source = NULL;
1733     BlockDriver *drv = NULL;
1734     Error *local_err = NULL;
1735     int flags;
1736     int64_t size;
1737     int ret;
1738 
1739     if (!has_speed) {
1740         speed = 0;
1741     }
1742     if (!has_on_source_error) {
1743         on_source_error = BLOCKDEV_ON_ERROR_REPORT;
1744     }
1745     if (!has_on_target_error) {
1746         on_target_error = BLOCKDEV_ON_ERROR_REPORT;
1747     }
1748     if (!has_mode) {
1749         mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
1750     }
1751 
1752     bs = bdrv_find(device);
1753     if (!bs) {
1754         error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1755         return;
1756     }
1757 
1758     if (!bdrv_is_inserted(bs)) {
1759         error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1760         return;
1761     }
1762 
1763     if (!has_format) {
1764         format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name;
1765     }
1766     if (format) {
1767         drv = bdrv_find_format(format);
1768         if (!drv) {
1769             error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
1770             return;
1771         }
1772     }
1773 
1774     if (bdrv_in_use(bs)) {
1775         error_set(errp, QERR_DEVICE_IN_USE, device);
1776         return;
1777     }
1778 
1779     flags = bs->open_flags | BDRV_O_RDWR;
1780 
1781     /* See if we have a backing HD we can use to create our new image
1782      * on top of. */
1783     if (sync == MIRROR_SYNC_MODE_TOP) {
1784         source = bs->backing_hd;
1785         if (!source) {
1786             sync = MIRROR_SYNC_MODE_FULL;
1787         }
1788     }
1789     if (sync == MIRROR_SYNC_MODE_NONE) {
1790         source = bs;
1791     }
1792 
1793     size = bdrv_getlength(bs);
1794     if (size < 0) {
1795         error_setg_errno(errp, -size, "bdrv_getlength failed");
1796         return;
1797     }
1798 
1799     if (mode != NEW_IMAGE_MODE_EXISTING) {
1800         assert(format && drv);
1801         if (source) {
1802             bdrv_img_create(target, format, source->filename,
1803                             source->drv->format_name, NULL,
1804                             size, flags, &local_err, false);
1805         } else {
1806             bdrv_img_create(target, format, NULL, NULL, NULL,
1807                             size, flags, &local_err, false);
1808         }
1809     }
1810 
1811     if (error_is_set(&local_err)) {
1812         error_propagate(errp, local_err);
1813         return;
1814     }
1815 
1816     target_bs = bdrv_new("");
1817     ret = bdrv_open(target_bs, target, NULL, flags, drv, &local_err);
1818     if (ret < 0) {
1819         bdrv_unref(target_bs);
1820         error_propagate(errp, local_err);
1821         return;
1822     }
1823 
1824     backup_start(bs, target_bs, speed, sync, on_source_error, on_target_error,
1825                  block_job_cb, bs, &local_err);
1826     if (local_err != NULL) {
1827         bdrv_unref(target_bs);
1828         error_propagate(errp, local_err);
1829         return;
1830     }
1831 }
1832 
1833 #define DEFAULT_MIRROR_BUF_SIZE   (10 << 20)
1834 
1835 void qmp_drive_mirror(const char *device, const char *target,
1836                       bool has_format, const char *format,
1837                       enum MirrorSyncMode sync,
1838                       bool has_mode, enum NewImageMode mode,
1839                       bool has_speed, int64_t speed,
1840                       bool has_granularity, uint32_t granularity,
1841                       bool has_buf_size, int64_t buf_size,
1842                       bool has_on_source_error, BlockdevOnError on_source_error,
1843                       bool has_on_target_error, BlockdevOnError on_target_error,
1844                       Error **errp)
1845 {
1846     BlockDriverState *bs;
1847     BlockDriverState *source, *target_bs;
1848     BlockDriver *drv = NULL;
1849     Error *local_err = NULL;
1850     int flags;
1851     int64_t size;
1852     int ret;
1853 
1854     if (!has_speed) {
1855         speed = 0;
1856     }
1857     if (!has_on_source_error) {
1858         on_source_error = BLOCKDEV_ON_ERROR_REPORT;
1859     }
1860     if (!has_on_target_error) {
1861         on_target_error = BLOCKDEV_ON_ERROR_REPORT;
1862     }
1863     if (!has_mode) {
1864         mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
1865     }
1866     if (!has_granularity) {
1867         granularity = 0;
1868     }
1869     if (!has_buf_size) {
1870         buf_size = DEFAULT_MIRROR_BUF_SIZE;
1871     }
1872 
1873     if (granularity != 0 && (granularity < 512 || granularity > 1048576 * 64)) {
1874         error_set(errp, QERR_INVALID_PARAMETER, device);
1875         return;
1876     }
1877     if (granularity & (granularity - 1)) {
1878         error_set(errp, QERR_INVALID_PARAMETER, device);
1879         return;
1880     }
1881 
1882     bs = bdrv_find(device);
1883     if (!bs) {
1884         error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1885         return;
1886     }
1887 
1888     if (!bdrv_is_inserted(bs)) {
1889         error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1890         return;
1891     }
1892 
1893     if (!has_format) {
1894         format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name;
1895     }
1896     if (format) {
1897         drv = bdrv_find_format(format);
1898         if (!drv) {
1899             error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
1900             return;
1901         }
1902     }
1903 
1904     if (bdrv_in_use(bs)) {
1905         error_set(errp, QERR_DEVICE_IN_USE, device);
1906         return;
1907     }
1908 
1909     flags = bs->open_flags | BDRV_O_RDWR;
1910     source = bs->backing_hd;
1911     if (!source && sync == MIRROR_SYNC_MODE_TOP) {
1912         sync = MIRROR_SYNC_MODE_FULL;
1913     }
1914 
1915     size = bdrv_getlength(bs);
1916     if (size < 0) {
1917         error_setg_errno(errp, -size, "bdrv_getlength failed");
1918         return;
1919     }
1920 
1921     if (sync == MIRROR_SYNC_MODE_FULL && mode != NEW_IMAGE_MODE_EXISTING) {
1922         /* create new image w/o backing file */
1923         assert(format && drv);
1924         bdrv_img_create(target, format,
1925                         NULL, NULL, NULL, size, flags, &local_err, false);
1926     } else {
1927         switch (mode) {
1928         case NEW_IMAGE_MODE_EXISTING:
1929             ret = 0;
1930             break;
1931         case NEW_IMAGE_MODE_ABSOLUTE_PATHS:
1932             /* create new image with backing file */
1933             bdrv_img_create(target, format,
1934                             source->filename,
1935                             source->drv->format_name,
1936                             NULL, size, flags, &local_err, false);
1937             break;
1938         default:
1939             abort();
1940         }
1941     }
1942 
1943     if (error_is_set(&local_err)) {
1944         error_propagate(errp, local_err);
1945         return;
1946     }
1947 
1948     /* Mirroring takes care of copy-on-write using the source's backing
1949      * file.
1950      */
1951     target_bs = bdrv_new("");
1952     ret = bdrv_open(target_bs, target, NULL, flags | BDRV_O_NO_BACKING, drv,
1953                     &local_err);
1954     if (ret < 0) {
1955         bdrv_unref(target_bs);
1956         error_propagate(errp, local_err);
1957         return;
1958     }
1959 
1960     mirror_start(bs, target_bs, speed, granularity, buf_size, sync,
1961                  on_source_error, on_target_error,
1962                  block_job_cb, bs, &local_err);
1963     if (local_err != NULL) {
1964         bdrv_unref(target_bs);
1965         error_propagate(errp, local_err);
1966         return;
1967     }
1968 }
1969 
1970 static BlockJob *find_block_job(const char *device)
1971 {
1972     BlockDriverState *bs;
1973 
1974     bs = bdrv_find(device);
1975     if (!bs || !bs->job) {
1976         return NULL;
1977     }
1978     return bs->job;
1979 }
1980 
1981 void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp)
1982 {
1983     BlockJob *job = find_block_job(device);
1984 
1985     if (!job) {
1986         error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
1987         return;
1988     }
1989 
1990     block_job_set_speed(job, speed, errp);
1991 }
1992 
1993 void qmp_block_job_cancel(const char *device,
1994                           bool has_force, bool force, Error **errp)
1995 {
1996     BlockJob *job = find_block_job(device);
1997 
1998     if (!has_force) {
1999         force = false;
2000     }
2001 
2002     if (!job) {
2003         error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
2004         return;
2005     }
2006     if (job->paused && !force) {
2007         error_set(errp, QERR_BLOCK_JOB_PAUSED, device);
2008         return;
2009     }
2010 
2011     trace_qmp_block_job_cancel(job);
2012     block_job_cancel(job);
2013 }
2014 
2015 void qmp_block_job_pause(const char *device, Error **errp)
2016 {
2017     BlockJob *job = find_block_job(device);
2018 
2019     if (!job) {
2020         error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
2021         return;
2022     }
2023 
2024     trace_qmp_block_job_pause(job);
2025     block_job_pause(job);
2026 }
2027 
2028 void qmp_block_job_resume(const char *device, Error **errp)
2029 {
2030     BlockJob *job = find_block_job(device);
2031 
2032     if (!job) {
2033         error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
2034         return;
2035     }
2036 
2037     trace_qmp_block_job_resume(job);
2038     block_job_resume(job);
2039 }
2040 
2041 void qmp_block_job_complete(const char *device, Error **errp)
2042 {
2043     BlockJob *job = find_block_job(device);
2044 
2045     if (!job) {
2046         error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
2047         return;
2048     }
2049 
2050     trace_qmp_block_job_complete(job);
2051     block_job_complete(job, errp);
2052 }
2053 
2054 static void do_qmp_query_block_jobs_one(void *opaque, BlockDriverState *bs)
2055 {
2056     BlockJobInfoList **prev = opaque;
2057     BlockJob *job = bs->job;
2058 
2059     if (job) {
2060         BlockJobInfoList *elem = g_new0(BlockJobInfoList, 1);
2061         elem->value = block_job_query(bs->job);
2062         (*prev)->next = elem;
2063         *prev = elem;
2064     }
2065 }
2066 
2067 BlockJobInfoList *qmp_query_block_jobs(Error **errp)
2068 {
2069     /* Dummy is a fake list element for holding the head pointer */
2070     BlockJobInfoList dummy = {};
2071     BlockJobInfoList *prev = &dummy;
2072     bdrv_iterate(do_qmp_query_block_jobs_one, &prev);
2073     return dummy.next;
2074 }
2075 
2076 QemuOptsList qemu_common_drive_opts = {
2077     .name = "drive",
2078     .head = QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts.head),
2079     .desc = {
2080         {
2081             .name = "bus",
2082             .type = QEMU_OPT_NUMBER,
2083             .help = "bus number",
2084         },{
2085             .name = "unit",
2086             .type = QEMU_OPT_NUMBER,
2087             .help = "unit number (i.e. lun for scsi)",
2088         },{
2089             .name = "if",
2090             .type = QEMU_OPT_STRING,
2091             .help = "interface (ide, scsi, sd, mtd, floppy, pflash, virtio)",
2092         },{
2093             .name = "index",
2094             .type = QEMU_OPT_NUMBER,
2095             .help = "index number",
2096         },{
2097             .name = "cyls",
2098             .type = QEMU_OPT_NUMBER,
2099             .help = "number of cylinders (ide disk geometry)",
2100         },{
2101             .name = "heads",
2102             .type = QEMU_OPT_NUMBER,
2103             .help = "number of heads (ide disk geometry)",
2104         },{
2105             .name = "secs",
2106             .type = QEMU_OPT_NUMBER,
2107             .help = "number of sectors (ide disk geometry)",
2108         },{
2109             .name = "trans",
2110             .type = QEMU_OPT_STRING,
2111             .help = "chs translation (auto, lba. none)",
2112         },{
2113             .name = "media",
2114             .type = QEMU_OPT_STRING,
2115             .help = "media type (disk, cdrom)",
2116         },{
2117             .name = "snapshot",
2118             .type = QEMU_OPT_BOOL,
2119             .help = "enable/disable snapshot mode",
2120         },{
2121             .name = "file",
2122             .type = QEMU_OPT_STRING,
2123             .help = "disk image",
2124         },{
2125             .name = "discard",
2126             .type = QEMU_OPT_STRING,
2127             .help = "discard operation (ignore/off, unmap/on)",
2128         },{
2129             .name = "cache.writeback",
2130             .type = QEMU_OPT_BOOL,
2131             .help = "enables writeback mode for any caches",
2132         },{
2133             .name = "cache.direct",
2134             .type = QEMU_OPT_BOOL,
2135             .help = "enables use of O_DIRECT (bypass the host page cache)",
2136         },{
2137             .name = "cache.no-flush",
2138             .type = QEMU_OPT_BOOL,
2139             .help = "ignore any flush requests for the device",
2140         },{
2141             .name = "aio",
2142             .type = QEMU_OPT_STRING,
2143             .help = "host AIO implementation (threads, native)",
2144         },{
2145             .name = "format",
2146             .type = QEMU_OPT_STRING,
2147             .help = "disk format (raw, qcow2, ...)",
2148         },{
2149             .name = "serial",
2150             .type = QEMU_OPT_STRING,
2151             .help = "disk serial number",
2152         },{
2153             .name = "rerror",
2154             .type = QEMU_OPT_STRING,
2155             .help = "read error action",
2156         },{
2157             .name = "werror",
2158             .type = QEMU_OPT_STRING,
2159             .help = "write error action",
2160         },{
2161             .name = "addr",
2162             .type = QEMU_OPT_STRING,
2163             .help = "pci address (virtio only)",
2164         },{
2165             .name = "read-only",
2166             .type = QEMU_OPT_BOOL,
2167             .help = "open drive file as read-only",
2168         },{
2169             .name = "throttling.iops-total",
2170             .type = QEMU_OPT_NUMBER,
2171             .help = "limit total I/O operations per second",
2172         },{
2173             .name = "throttling.iops-read",
2174             .type = QEMU_OPT_NUMBER,
2175             .help = "limit read operations per second",
2176         },{
2177             .name = "throttling.iops-write",
2178             .type = QEMU_OPT_NUMBER,
2179             .help = "limit write operations per second",
2180         },{
2181             .name = "throttling.bps-total",
2182             .type = QEMU_OPT_NUMBER,
2183             .help = "limit total bytes per second",
2184         },{
2185             .name = "throttling.bps-read",
2186             .type = QEMU_OPT_NUMBER,
2187             .help = "limit read bytes per second",
2188         },{
2189             .name = "throttling.bps-write",
2190             .type = QEMU_OPT_NUMBER,
2191             .help = "limit write bytes per second",
2192         },{
2193             .name = "throttling.iops-total-max",
2194             .type = QEMU_OPT_NUMBER,
2195             .help = "I/O operations burst",
2196         },{
2197             .name = "throttling.iops-read-max",
2198             .type = QEMU_OPT_NUMBER,
2199             .help = "I/O operations read burst",
2200         },{
2201             .name = "throttling.iops-write-max",
2202             .type = QEMU_OPT_NUMBER,
2203             .help = "I/O operations write burst",
2204         },{
2205             .name = "throttling.bps-total-max",
2206             .type = QEMU_OPT_NUMBER,
2207             .help = "total bytes burst",
2208         },{
2209             .name = "throttling.bps-read-max",
2210             .type = QEMU_OPT_NUMBER,
2211             .help = "total bytes read burst",
2212         },{
2213             .name = "throttling.bps-write-max",
2214             .type = QEMU_OPT_NUMBER,
2215             .help = "total bytes write burst",
2216         },{
2217             .name = "throttling.iops-size",
2218             .type = QEMU_OPT_NUMBER,
2219             .help = "when limiting by iops max size of an I/O in bytes",
2220         },{
2221             .name = "copy-on-read",
2222             .type = QEMU_OPT_BOOL,
2223             .help = "copy read data from backing file into image file",
2224         },{
2225             .name = "boot",
2226             .type = QEMU_OPT_BOOL,
2227             .help = "(deprecated, ignored)",
2228         },
2229         { /* end of list */ }
2230     },
2231 };
2232 
2233 QemuOptsList qemu_drive_opts = {
2234     .name = "drive",
2235     .head = QTAILQ_HEAD_INITIALIZER(qemu_drive_opts.head),
2236     .desc = {
2237         /*
2238          * no elements => accept any params
2239          * validation will happen later
2240          */
2241         { /* end of list */ }
2242     },
2243 };
2244