File:  [Qemu by Fabrice Bellard] / qemu / blockdev.c
Revision 1.1.1.2 (vendor branch): download - view: text, annotated - select for diffs
Tue Apr 24 18:33:32 2018 UTC (3 years, 1 month ago) by root
Branches: qemu, MAIN
CVS tags: qemu0140, HEAD
qemu 0.14.0

    1: /*
    2:  * QEMU host block devices
    3:  *
    4:  * Copyright (c) 2003-2008 Fabrice Bellard
    5:  *
    6:  * This work is licensed under the terms of the GNU GPL, version 2 or
    7:  * later.  See the COPYING file in the top-level directory.
    8:  */
    9: 
   10: #include "block.h"
   11: #include "blockdev.h"
   12: #include "monitor.h"
   13: #include "qerror.h"
   14: #include "qemu-option.h"
   15: #include "qemu-config.h"
   16: #include "sysemu.h"
   17: #include "hw/qdev.h"
   18: #include "block_int.h"
   19: 
   20: static QTAILQ_HEAD(drivelist, DriveInfo) drives = QTAILQ_HEAD_INITIALIZER(drives);
   21: 
   22: static const char *const if_name[IF_COUNT] = {
   23:     [IF_NONE] = "none",
   24:     [IF_IDE] = "ide",
   25:     [IF_SCSI] = "scsi",
   26:     [IF_FLOPPY] = "floppy",
   27:     [IF_PFLASH] = "pflash",
   28:     [IF_MTD] = "mtd",
   29:     [IF_SD] = "sd",
   30:     [IF_VIRTIO] = "virtio",
   31:     [IF_XEN] = "xen",
   32: };
   33: 
   34: static const int if_max_devs[IF_COUNT] = {
   35:     /*
   36:      * Do not change these numbers!  They govern how drive option
   37:      * index maps to unit and bus.  That mapping is ABI.
   38:      *
   39:      * All controllers used to imlement if=T drives need to support
   40:      * if_max_devs[T] units, for any T with if_max_devs[T] != 0.
   41:      * Otherwise, some index values map to "impossible" bus, unit
   42:      * values.
   43:      *
   44:      * For instance, if you change [IF_SCSI] to 255, -drive
   45:      * if=scsi,index=12 no longer means bus=1,unit=5, but
   46:      * bus=0,unit=12.  With an lsi53c895a controller (7 units max),
   47:      * the drive can't be set up.  Regression.
   48:      */
   49:     [IF_IDE] = 2,
   50:     [IF_SCSI] = 7,
   51: };
   52: 
   53: /*
   54:  * We automatically delete the drive when a device using it gets
   55:  * unplugged.  Questionable feature, but we can't just drop it.
   56:  * Device models call blockdev_mark_auto_del() to schedule the
   57:  * automatic deletion, and generic qdev code calls blockdev_auto_del()
   58:  * when deletion is actually safe.
   59:  */
   60: void blockdev_mark_auto_del(BlockDriverState *bs)
   61: {
   62:     DriveInfo *dinfo = drive_get_by_blockdev(bs);
   63: 
   64:     if (dinfo) {
   65:         dinfo->auto_del = 1;
   66:     }
   67: }
   68: 
   69: void blockdev_auto_del(BlockDriverState *bs)
   70: {
   71:     DriveInfo *dinfo = drive_get_by_blockdev(bs);
   72: 
   73:     if (dinfo && dinfo->auto_del) {
   74:         drive_put_ref(dinfo);
   75:     }
   76: }
   77: 
   78: static int drive_index_to_bus_id(BlockInterfaceType type, int index)
   79: {
   80:     int max_devs = if_max_devs[type];
   81:     return max_devs ? index / max_devs : 0;
   82: }
   83: 
   84: static int drive_index_to_unit_id(BlockInterfaceType type, int index)
   85: {
   86:     int max_devs = if_max_devs[type];
   87:     return max_devs ? index % max_devs : index;
   88: }
   89: 
   90: QemuOpts *drive_def(const char *optstr)
   91: {
   92:     return qemu_opts_parse(qemu_find_opts("drive"), optstr, 0);
   93: }
   94: 
   95: QemuOpts *drive_add(BlockInterfaceType type, int index, const char *file,
   96:                     const char *optstr)
   97: {
   98:     QemuOpts *opts;
   99:     char buf[32];
  100: 
  101:     opts = drive_def(optstr);
  102:     if (!opts) {
  103:         return NULL;
  104:     }
  105:     if (type != IF_DEFAULT) {
  106:         qemu_opt_set(opts, "if", if_name[type]);
  107:     }
  108:     if (index >= 0) {
  109:         snprintf(buf, sizeof(buf), "%d", index);
  110:         qemu_opt_set(opts, "index", buf);
  111:     }
  112:     if (file)
  113:         qemu_opt_set(opts, "file", file);
  114:     return opts;
  115: }
  116: 
  117: DriveInfo *drive_get(BlockInterfaceType type, int bus, int unit)
  118: {
  119:     DriveInfo *dinfo;
  120: 
  121:     /* seek interface, bus and unit */
  122: 
  123:     QTAILQ_FOREACH(dinfo, &drives, next) {
  124:         if (dinfo->type == type &&
  125: 	    dinfo->bus == bus &&
  126: 	    dinfo->unit == unit)
  127:             return dinfo;
  128:     }
  129: 
  130:     return NULL;
  131: }
  132: 
  133: DriveInfo *drive_get_by_index(BlockInterfaceType type, int index)
  134: {
  135:     return drive_get(type,
  136:                      drive_index_to_bus_id(type, index),
  137:                      drive_index_to_unit_id(type, index));
  138: }
  139: 
  140: int drive_get_max_bus(BlockInterfaceType type)
  141: {
  142:     int max_bus;
  143:     DriveInfo *dinfo;
  144: 
  145:     max_bus = -1;
  146:     QTAILQ_FOREACH(dinfo, &drives, next) {
  147:         if(dinfo->type == type &&
  148:            dinfo->bus > max_bus)
  149:             max_bus = dinfo->bus;
  150:     }
  151:     return max_bus;
  152: }
  153: 
  154: /* Get a block device.  This should only be used for single-drive devices
  155:    (e.g. SD/Floppy/MTD).  Multi-disk devices (scsi/ide) should use the
  156:    appropriate bus.  */
  157: DriveInfo *drive_get_next(BlockInterfaceType type)
  158: {
  159:     static int next_block_unit[IF_COUNT];
  160: 
  161:     return drive_get(type, 0, next_block_unit[type]++);
  162: }
  163: 
  164: DriveInfo *drive_get_by_blockdev(BlockDriverState *bs)
  165: {
  166:     DriveInfo *dinfo;
  167: 
  168:     QTAILQ_FOREACH(dinfo, &drives, next) {
  169:         if (dinfo->bdrv == bs) {
  170:             return dinfo;
  171:         }
  172:     }
  173:     return NULL;
  174: }
  175: 
  176: static void bdrv_format_print(void *opaque, const char *name)
  177: {
  178:     error_printf(" %s", name);
  179: }
  180: 
  181: static void drive_uninit(DriveInfo *dinfo)
  182: {
  183:     qemu_opts_del(dinfo->opts);
  184:     bdrv_delete(dinfo->bdrv);
  185:     qemu_free(dinfo->id);
  186:     QTAILQ_REMOVE(&drives, dinfo, next);
  187:     qemu_free(dinfo);
  188: }
  189: 
  190: void drive_put_ref(DriveInfo *dinfo)
  191: {
  192:     assert(dinfo->refcount);
  193:     if (--dinfo->refcount == 0) {
  194:         drive_uninit(dinfo);
  195:     }
  196: }
  197: 
  198: void drive_get_ref(DriveInfo *dinfo)
  199: {
  200:     dinfo->refcount++;
  201: }
  202: 
  203: static int parse_block_error_action(const char *buf, int is_read)
  204: {
  205:     if (!strcmp(buf, "ignore")) {
  206:         return BLOCK_ERR_IGNORE;
  207:     } else if (!is_read && !strcmp(buf, "enospc")) {
  208:         return BLOCK_ERR_STOP_ENOSPC;
  209:     } else if (!strcmp(buf, "stop")) {
  210:         return BLOCK_ERR_STOP_ANY;
  211:     } else if (!strcmp(buf, "report")) {
  212:         return BLOCK_ERR_REPORT;
  213:     } else {
  214:         error_report("'%s' invalid %s error action",
  215:                      buf, is_read ? "read" : "write");
  216:         return -1;
  217:     }
  218: }
  219: 
  220: DriveInfo *drive_init(QemuOpts *opts, int default_to_scsi)
  221: {
  222:     const char *buf;
  223:     const char *file = NULL;
  224:     char devname[128];
  225:     const char *serial;
  226:     const char *mediastr = "";
  227:     BlockInterfaceType type;
  228:     enum { MEDIA_DISK, MEDIA_CDROM } media;
  229:     int bus_id, unit_id;
  230:     int cyls, heads, secs, translation;
  231:     BlockDriver *drv = NULL;
  232:     int max_devs;
  233:     int index;
  234:     int ro = 0;
  235:     int bdrv_flags = 0;
  236:     int on_read_error, on_write_error;
  237:     const char *devaddr;
  238:     DriveInfo *dinfo;
  239:     int snapshot = 0;
  240:     int ret;
  241: 
  242:     translation = BIOS_ATA_TRANSLATION_AUTO;
  243: 
  244:     if (default_to_scsi) {
  245:         type = IF_SCSI;
  246:         pstrcpy(devname, sizeof(devname), "scsi");
  247:     } else {
  248:         type = IF_IDE;
  249:         pstrcpy(devname, sizeof(devname), "ide");
  250:     }
  251:     media = MEDIA_DISK;
  252: 
  253:     /* extract parameters */
  254:     bus_id  = qemu_opt_get_number(opts, "bus", 0);
  255:     unit_id = qemu_opt_get_number(opts, "unit", -1);
  256:     index   = qemu_opt_get_number(opts, "index", -1);
  257: 
  258:     cyls  = qemu_opt_get_number(opts, "cyls", 0);
  259:     heads = qemu_opt_get_number(opts, "heads", 0);
  260:     secs  = qemu_opt_get_number(opts, "secs", 0);
  261: 
  262:     snapshot = qemu_opt_get_bool(opts, "snapshot", 0);
  263:     ro = qemu_opt_get_bool(opts, "readonly", 0);
  264: 
  265:     file = qemu_opt_get(opts, "file");
  266:     serial = qemu_opt_get(opts, "serial");
  267: 
  268:     if ((buf = qemu_opt_get(opts, "if")) != NULL) {
  269:         pstrcpy(devname, sizeof(devname), buf);
  270:         for (type = 0; type < IF_COUNT && strcmp(buf, if_name[type]); type++)
  271:             ;
  272:         if (type == IF_COUNT) {
  273:             error_report("unsupported bus type '%s'", buf);
  274:             return NULL;
  275: 	}
  276:     }
  277:     max_devs = if_max_devs[type];
  278: 
  279:     if (cyls || heads || secs) {
  280:         if (cyls < 1 || (type == IF_IDE && cyls > 16383)) {
  281:             error_report("invalid physical cyls number");
  282: 	    return NULL;
  283: 	}
  284:         if (heads < 1 || (type == IF_IDE && heads > 16)) {
  285:             error_report("invalid physical heads number");
  286: 	    return NULL;
  287: 	}
  288:         if (secs < 1 || (type == IF_IDE && secs > 63)) {
  289:             error_report("invalid physical secs number");
  290: 	    return NULL;
  291: 	}
  292:     }
  293: 
  294:     if ((buf = qemu_opt_get(opts, "trans")) != NULL) {
  295:         if (!cyls) {
  296:             error_report("'%s' trans must be used with cyls,heads and secs",
  297:                          buf);
  298:             return NULL;
  299:         }
  300:         if (!strcmp(buf, "none"))
  301:             translation = BIOS_ATA_TRANSLATION_NONE;
  302:         else if (!strcmp(buf, "lba"))
  303:             translation = BIOS_ATA_TRANSLATION_LBA;
  304:         else if (!strcmp(buf, "auto"))
  305:             translation = BIOS_ATA_TRANSLATION_AUTO;
  306: 	else {
  307:             error_report("'%s' invalid translation type", buf);
  308: 	    return NULL;
  309: 	}
  310:     }
  311: 
  312:     if ((buf = qemu_opt_get(opts, "media")) != NULL) {
  313:         if (!strcmp(buf, "disk")) {
  314: 	    media = MEDIA_DISK;
  315: 	} else if (!strcmp(buf, "cdrom")) {
  316:             if (cyls || secs || heads) {
  317:                 error_report("'%s' invalid physical CHS format", buf);
  318: 	        return NULL;
  319:             }
  320: 	    media = MEDIA_CDROM;
  321: 	} else {
  322: 	    error_report("'%s' invalid media", buf);
  323: 	    return NULL;
  324: 	}
  325:     }
  326: 
  327:     if ((buf = qemu_opt_get(opts, "cache")) != NULL) {
  328:         if (!strcmp(buf, "off") || !strcmp(buf, "none")) {
  329:             bdrv_flags |= BDRV_O_NOCACHE;
  330:         } else if (!strcmp(buf, "writeback")) {
  331:             bdrv_flags |= BDRV_O_CACHE_WB;
  332:         } else if (!strcmp(buf, "unsafe")) {
  333:             bdrv_flags |= BDRV_O_CACHE_WB;
  334:             bdrv_flags |= BDRV_O_NO_FLUSH;
  335:         } else if (!strcmp(buf, "writethrough")) {
  336:             /* this is the default */
  337:         } else {
  338:            error_report("invalid cache option");
  339:            return NULL;
  340:         }
  341:     }
  342: 
  343: #ifdef CONFIG_LINUX_AIO
  344:     if ((buf = qemu_opt_get(opts, "aio")) != NULL) {
  345:         if (!strcmp(buf, "native")) {
  346:             bdrv_flags |= BDRV_O_NATIVE_AIO;
  347:         } else if (!strcmp(buf, "threads")) {
  348:             /* this is the default */
  349:         } else {
  350:            error_report("invalid aio option");
  351:            return NULL;
  352:         }
  353:     }
  354: #endif
  355: 
  356:     if ((buf = qemu_opt_get(opts, "format")) != NULL) {
  357:        if (strcmp(buf, "?") == 0) {
  358:            error_printf("Supported formats:");
  359:            bdrv_iterate_format(bdrv_format_print, NULL);
  360:            error_printf("\n");
  361:            return NULL;
  362:         }
  363:         drv = bdrv_find_whitelisted_format(buf);
  364:         if (!drv) {
  365:             error_report("'%s' invalid format", buf);
  366:             return NULL;
  367:         }
  368:     }
  369: 
  370:     on_write_error = BLOCK_ERR_STOP_ENOSPC;
  371:     if ((buf = qemu_opt_get(opts, "werror")) != NULL) {
  372:         if (type != IF_IDE && type != IF_SCSI && type != IF_VIRTIO && type != IF_NONE) {
  373:             error_report("werror is not supported by this bus type");
  374:             return NULL;
  375:         }
  376: 
  377:         on_write_error = parse_block_error_action(buf, 0);
  378:         if (on_write_error < 0) {
  379:             return NULL;
  380:         }
  381:     }
  382: 
  383:     on_read_error = BLOCK_ERR_REPORT;
  384:     if ((buf = qemu_opt_get(opts, "rerror")) != NULL) {
  385:         if (type != IF_IDE && type != IF_VIRTIO && type != IF_SCSI && type != IF_NONE) {
  386:             error_report("rerror is not supported by this bus type");
  387:             return NULL;
  388:         }
  389: 
  390:         on_read_error = parse_block_error_action(buf, 1);
  391:         if (on_read_error < 0) {
  392:             return NULL;
  393:         }
  394:     }
  395: 
  396:     if ((devaddr = qemu_opt_get(opts, "addr")) != NULL) {
  397:         if (type != IF_VIRTIO) {
  398:             error_report("addr is not supported by this bus type");
  399:             return NULL;
  400:         }
  401:     }
  402: 
  403:     /* compute bus and unit according index */
  404: 
  405:     if (index != -1) {
  406:         if (bus_id != 0 || unit_id != -1) {
  407:             error_report("index cannot be used with bus and unit");
  408:             return NULL;
  409:         }
  410:         bus_id = drive_index_to_bus_id(type, index);
  411:         unit_id = drive_index_to_unit_id(type, index);
  412:     }
  413: 
  414:     /* if user doesn't specify a unit_id,
  415:      * try to find the first free
  416:      */
  417: 
  418:     if (unit_id == -1) {
  419:        unit_id = 0;
  420:        while (drive_get(type, bus_id, unit_id) != NULL) {
  421:            unit_id++;
  422:            if (max_devs && unit_id >= max_devs) {
  423:                unit_id -= max_devs;
  424:                bus_id++;
  425:            }
  426:        }
  427:     }
  428: 
  429:     /* check unit id */
  430: 
  431:     if (max_devs && unit_id >= max_devs) {
  432:         error_report("unit %d too big (max is %d)",
  433:                      unit_id, max_devs - 1);
  434:         return NULL;
  435:     }
  436: 
  437:     /*
  438:      * catch multiple definitions
  439:      */
  440: 
  441:     if (drive_get(type, bus_id, unit_id) != NULL) {
  442:         error_report("drive with bus=%d, unit=%d (index=%d) exists",
  443:                      bus_id, unit_id, index);
  444:         return NULL;
  445:     }
  446: 
  447:     /* init */
  448: 
  449:     dinfo = qemu_mallocz(sizeof(*dinfo));
  450:     if ((buf = qemu_opts_id(opts)) != NULL) {
  451:         dinfo->id = qemu_strdup(buf);
  452:     } else {
  453:         /* no id supplied -> create one */
  454:         dinfo->id = qemu_mallocz(32);
  455:         if (type == IF_IDE || type == IF_SCSI)
  456:             mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd";
  457:         if (max_devs)
  458:             snprintf(dinfo->id, 32, "%s%i%s%i",
  459:                      devname, bus_id, mediastr, unit_id);
  460:         else
  461:             snprintf(dinfo->id, 32, "%s%s%i",
  462:                      devname, mediastr, unit_id);
  463:     }
  464:     dinfo->bdrv = bdrv_new(dinfo->id);
  465:     dinfo->devaddr = devaddr;
  466:     dinfo->type = type;
  467:     dinfo->bus = bus_id;
  468:     dinfo->unit = unit_id;
  469:     dinfo->opts = opts;
  470:     dinfo->refcount = 1;
  471:     if (serial)
  472:         strncpy(dinfo->serial, serial, sizeof(dinfo->serial) - 1);
  473:     QTAILQ_INSERT_TAIL(&drives, dinfo, next);
  474: 
  475:     bdrv_set_on_error(dinfo->bdrv, on_read_error, on_write_error);
  476: 
  477:     switch(type) {
  478:     case IF_IDE:
  479:     case IF_SCSI:
  480:     case IF_XEN:
  481:     case IF_NONE:
  482:         switch(media) {
  483: 	case MEDIA_DISK:
  484:             if (cyls != 0) {
  485:                 bdrv_set_geometry_hint(dinfo->bdrv, cyls, heads, secs);
  486:                 bdrv_set_translation_hint(dinfo->bdrv, translation);
  487:             }
  488: 	    break;
  489: 	case MEDIA_CDROM:
  490:             bdrv_set_type_hint(dinfo->bdrv, BDRV_TYPE_CDROM);
  491: 	    break;
  492: 	}
  493:         break;
  494:     case IF_SD:
  495:         /* FIXME: This isn't really a floppy, but it's a reasonable
  496:            approximation.  */
  497:     case IF_FLOPPY:
  498:         bdrv_set_type_hint(dinfo->bdrv, BDRV_TYPE_FLOPPY);
  499:         break;
  500:     case IF_PFLASH:
  501:     case IF_MTD:
  502:         break;
  503:     case IF_VIRTIO:
  504:         /* add virtio block device */
  505:         opts = qemu_opts_create(qemu_find_opts("device"), NULL, 0);
  506:         qemu_opt_set(opts, "driver", "virtio-blk-pci");
  507:         qemu_opt_set(opts, "drive", dinfo->id);
  508:         if (devaddr)
  509:             qemu_opt_set(opts, "addr", devaddr);
  510:         break;
  511:     default:
  512:         abort();
  513:     }
  514:     if (!file || !*file) {
  515:         return dinfo;
  516:     }
  517:     if (snapshot) {
  518:         /* always use cache=unsafe with snapshot */
  519:         bdrv_flags &= ~BDRV_O_CACHE_MASK;
  520:         bdrv_flags |= (BDRV_O_SNAPSHOT|BDRV_O_CACHE_WB|BDRV_O_NO_FLUSH);
  521:     }
  522: 
  523:     if (media == MEDIA_CDROM) {
  524:         /* CDROM is fine for any interface, don't check.  */
  525:         ro = 1;
  526:     } else if (ro == 1) {
  527:         if (type != IF_SCSI && type != IF_VIRTIO && type != IF_FLOPPY && type != IF_NONE) {
  528:             error_report("readonly not supported by this bus type");
  529:             goto err;
  530:         }
  531:     }
  532: 
  533:     bdrv_flags |= ro ? 0 : BDRV_O_RDWR;
  534: 
  535:     ret = bdrv_open(dinfo->bdrv, file, bdrv_flags, drv);
  536:     if (ret < 0) {
  537:         error_report("could not open disk image %s: %s",
  538:                      file, strerror(-ret));
  539:         goto err;
  540:     }
  541: 
  542:     if (bdrv_key_required(dinfo->bdrv))
  543:         autostart = 0;
  544:     return dinfo;
  545: 
  546: err:
  547:     bdrv_delete(dinfo->bdrv);
  548:     qemu_free(dinfo->id);
  549:     QTAILQ_REMOVE(&drives, dinfo, next);
  550:     qemu_free(dinfo);
  551:     return NULL;
  552: }
  553: 
  554: void do_commit(Monitor *mon, const QDict *qdict)
  555: {
  556:     const char *device = qdict_get_str(qdict, "device");
  557:     BlockDriverState *bs;
  558: 
  559:     if (!strcmp(device, "all")) {
  560:         bdrv_commit_all();
  561:     } else {
  562:         bs = bdrv_find(device);
  563:         if (!bs) {
  564:             qerror_report(QERR_DEVICE_NOT_FOUND, device);
  565:             return;
  566:         }
  567:         bdrv_commit(bs);
  568:     }
  569: }
  570: 
  571: int do_snapshot_blkdev(Monitor *mon, const QDict *qdict, QObject **ret_data)
  572: {
  573:     const char *device = qdict_get_str(qdict, "device");
  574:     const char *filename = qdict_get_try_str(qdict, "snapshot_file");
  575:     const char *format = qdict_get_try_str(qdict, "format");
  576:     BlockDriverState *bs;
  577:     BlockDriver *drv, *proto_drv;
  578:     int ret = 0;
  579:     int flags;
  580: 
  581:     if (!filename) {
  582:         qerror_report(QERR_MISSING_PARAMETER, "snapshot_file");
  583:         ret = -1;
  584:         goto out;
  585:     }
  586: 
  587:     bs = bdrv_find(device);
  588:     if (!bs) {
  589:         qerror_report(QERR_DEVICE_NOT_FOUND, device);
  590:         ret = -1;
  591:         goto out;
  592:     }
  593: 
  594:     if (!format) {
  595:         format = "qcow2";
  596:     }
  597: 
  598:     drv = bdrv_find_format(format);
  599:     if (!drv) {
  600:         qerror_report(QERR_INVALID_BLOCK_FORMAT, format);
  601:         ret = -1;
  602:         goto out;
  603:     }
  604: 
  605:     proto_drv = bdrv_find_protocol(filename);
  606:     if (!proto_drv) {
  607:         qerror_report(QERR_INVALID_BLOCK_FORMAT, format);
  608:         ret = -1;
  609:         goto out;
  610:     }
  611: 
  612:     ret = bdrv_img_create(filename, format, bs->filename,
  613:                           bs->drv->format_name, NULL, -1, bs->open_flags);
  614:     if (ret) {
  615:         goto out;
  616:     }
  617: 
  618:     qemu_aio_flush();
  619:     bdrv_flush(bs);
  620: 
  621:     flags = bs->open_flags;
  622:     bdrv_close(bs);
  623:     ret = bdrv_open(bs, filename, flags, drv);
  624:     /*
  625:      * If reopening the image file we just created fails, we really
  626:      * are in trouble :(
  627:      */
  628:     if (ret != 0) {
  629:         abort();
  630:     }
  631: out:
  632:     if (ret) {
  633:         ret = -1;
  634:     }
  635: 
  636:     return ret;
  637: }
  638: 
  639: static int eject_device(Monitor *mon, BlockDriverState *bs, int force)
  640: {
  641:     if (!force) {
  642:         if (!bdrv_is_removable(bs)) {
  643:             qerror_report(QERR_DEVICE_NOT_REMOVABLE,
  644:                            bdrv_get_device_name(bs));
  645:             return -1;
  646:         }
  647:         if (bdrv_is_locked(bs)) {
  648:             qerror_report(QERR_DEVICE_LOCKED, bdrv_get_device_name(bs));
  649:             return -1;
  650:         }
  651:     }
  652:     bdrv_close(bs);
  653:     return 0;
  654: }
  655: 
  656: int do_eject(Monitor *mon, const QDict *qdict, QObject **ret_data)
  657: {
  658:     BlockDriverState *bs;
  659:     int force = qdict_get_try_bool(qdict, "force", 0);
  660:     const char *filename = qdict_get_str(qdict, "device");
  661: 
  662:     bs = bdrv_find(filename);
  663:     if (!bs) {
  664:         qerror_report(QERR_DEVICE_NOT_FOUND, filename);
  665:         return -1;
  666:     }
  667:     return eject_device(mon, bs, force);
  668: }
  669: 
  670: int do_block_set_passwd(Monitor *mon, const QDict *qdict,
  671:                         QObject **ret_data)
  672: {
  673:     BlockDriverState *bs;
  674:     int err;
  675: 
  676:     bs = bdrv_find(qdict_get_str(qdict, "device"));
  677:     if (!bs) {
  678:         qerror_report(QERR_DEVICE_NOT_FOUND, qdict_get_str(qdict, "device"));
  679:         return -1;
  680:     }
  681: 
  682:     err = bdrv_set_key(bs, qdict_get_str(qdict, "password"));
  683:     if (err == -EINVAL) {
  684:         qerror_report(QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs));
  685:         return -1;
  686:     } else if (err < 0) {
  687:         qerror_report(QERR_INVALID_PASSWORD);
  688:         return -1;
  689:     }
  690: 
  691:     return 0;
  692: }
  693: 
  694: int do_change_block(Monitor *mon, const char *device,
  695:                     const char *filename, const char *fmt)
  696: {
  697:     BlockDriverState *bs;
  698:     BlockDriver *drv = NULL;
  699:     int bdrv_flags;
  700: 
  701:     bs = bdrv_find(device);
  702:     if (!bs) {
  703:         qerror_report(QERR_DEVICE_NOT_FOUND, device);
  704:         return -1;
  705:     }
  706:     if (fmt) {
  707:         drv = bdrv_find_whitelisted_format(fmt);
  708:         if (!drv) {
  709:             qerror_report(QERR_INVALID_BLOCK_FORMAT, fmt);
  710:             return -1;
  711:         }
  712:     }
  713:     if (eject_device(mon, bs, 0) < 0) {
  714:         return -1;
  715:     }
  716:     bdrv_flags = bdrv_is_read_only(bs) ? 0 : BDRV_O_RDWR;
  717:     bdrv_flags |= bdrv_is_snapshot(bs) ? BDRV_O_SNAPSHOT : 0;
  718:     if (bdrv_open(bs, filename, bdrv_flags, drv) < 0) {
  719:         qerror_report(QERR_OPEN_FILE_FAILED, filename);
  720:         return -1;
  721:     }
  722:     return monitor_read_bdrv_key_start(mon, bs, NULL, NULL);
  723: }
  724: 
  725: int do_drive_del(Monitor *mon, const QDict *qdict, QObject **ret_data)
  726: {
  727:     const char *id = qdict_get_str(qdict, "id");
  728:     BlockDriverState *bs;
  729:     BlockDriverState **ptr;
  730:     Property *prop;
  731: 
  732:     bs = bdrv_find(id);
  733:     if (!bs) {
  734:         qerror_report(QERR_DEVICE_NOT_FOUND, id);
  735:         return -1;
  736:     }
  737:     if (bdrv_in_use(bs)) {
  738:         qerror_report(QERR_DEVICE_IN_USE, id);
  739:         return -1;
  740:     }
  741: 
  742:     /* quiesce block driver; prevent further io */
  743:     qemu_aio_flush();
  744:     bdrv_flush(bs);
  745:     bdrv_close(bs);
  746: 
  747:     /* clean up guest state from pointing to host resource by
  748:      * finding and removing DeviceState "drive" property */
  749:     if (bs->peer) {
  750:         for (prop = bs->peer->info->props; prop && prop->name; prop++) {
  751:             if (prop->info->type == PROP_TYPE_DRIVE) {
  752:                 ptr = qdev_get_prop_ptr(bs->peer, prop);
  753:                 if (*ptr == bs) {
  754:                     bdrv_detach(bs, bs->peer);
  755:                     *ptr = NULL;
  756:                     break;
  757:                 }
  758:             }
  759:         }
  760:     }
  761: 
  762:     /* clean up host side */
  763:     drive_uninit(drive_get_by_blockdev(bs));
  764: 
  765:     return 0;
  766: }
  767: 
  768: /*
  769:  * XXX: replace the QERR_UNDEFINED_ERROR errors with real values once the
  770:  * existing QERR_ macro mess is cleaned up.  A good example for better
  771:  * error reports can be found in the qemu-img resize code.
  772:  */
  773: int do_block_resize(Monitor *mon, const QDict *qdict, QObject **ret_data)
  774: {
  775:     const char *device = qdict_get_str(qdict, "device");
  776:     int64_t size = qdict_get_int(qdict, "size");
  777:     BlockDriverState *bs;
  778: 
  779:     bs = bdrv_find(device);
  780:     if (!bs) {
  781:         qerror_report(QERR_DEVICE_NOT_FOUND, device);
  782:         return -1;
  783:     }
  784: 
  785:     if (size < 0) {
  786:         qerror_report(QERR_UNDEFINED_ERROR);
  787:         return -1;
  788:     }
  789: 
  790:     if (bdrv_truncate(bs, size)) {
  791:         qerror_report(QERR_UNDEFINED_ERROR);
  792:         return -1;
  793:     }
  794: 
  795:     return 0;
  796: }

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