File:  [Qemu by Fabrice Bellard] / qemu / blockdev.c
Revision 1.1.1.5 (vendor branch): download - view: text, annotated - select for diffs
Tue Apr 24 19:16:53 2018 UTC (3 years, 4 months ago) by root
Branches: qemu, MAIN
CVS tags: qemu1001, HEAD
qemu 1.0.1

    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 "block_int.h"
   18: 
   19: static QTAILQ_HEAD(drivelist, DriveInfo) drives = QTAILQ_HEAD_INITIALIZER(drives);
   20: 
   21: static const char *const if_name[IF_COUNT] = {
   22:     [IF_NONE] = "none",
   23:     [IF_IDE] = "ide",
   24:     [IF_SCSI] = "scsi",
   25:     [IF_FLOPPY] = "floppy",
   26:     [IF_PFLASH] = "pflash",
   27:     [IF_MTD] = "mtd",
   28:     [IF_SD] = "sd",
   29:     [IF_VIRTIO] = "virtio",
   30:     [IF_XEN] = "xen",
   31: };
   32: 
   33: static const int if_max_devs[IF_COUNT] = {
   34:     /*
   35:      * Do not change these numbers!  They govern how drive option
   36:      * index maps to unit and bus.  That mapping is ABI.
   37:      *
   38:      * All controllers used to imlement if=T drives need to support
   39:      * if_max_devs[T] units, for any T with if_max_devs[T] != 0.
   40:      * Otherwise, some index values map to "impossible" bus, unit
   41:      * values.
   42:      *
   43:      * For instance, if you change [IF_SCSI] to 255, -drive
   44:      * if=scsi,index=12 no longer means bus=1,unit=5, but
   45:      * bus=0,unit=12.  With an lsi53c895a controller (7 units max),
   46:      * the drive can't be set up.  Regression.
   47:      */
   48:     [IF_IDE] = 2,
   49:     [IF_SCSI] = 7,
   50: };
   51: 
   52: /*
   53:  * We automatically delete the drive when a device using it gets
   54:  * unplugged.  Questionable feature, but we can't just drop it.
   55:  * Device models call blockdev_mark_auto_del() to schedule the
   56:  * automatic deletion, and generic qdev code calls blockdev_auto_del()
   57:  * when deletion is actually safe.
   58:  */
   59: void blockdev_mark_auto_del(BlockDriverState *bs)
   60: {
   61:     DriveInfo *dinfo = drive_get_by_blockdev(bs);
   62: 
   63:     if (dinfo) {
   64:         dinfo->auto_del = 1;
   65:     }
   66: }
   67: 
   68: void blockdev_auto_del(BlockDriverState *bs)
   69: {
   70:     DriveInfo *dinfo = drive_get_by_blockdev(bs);
   71: 
   72:     if (dinfo && dinfo->auto_del) {
   73:         drive_put_ref(dinfo);
   74:     }
   75: }
   76: 
   77: static int drive_index_to_bus_id(BlockInterfaceType type, int index)
   78: {
   79:     int max_devs = if_max_devs[type];
   80:     return max_devs ? index / max_devs : 0;
   81: }
   82: 
   83: static int drive_index_to_unit_id(BlockInterfaceType type, int index)
   84: {
   85:     int max_devs = if_max_devs[type];
   86:     return max_devs ? index % max_devs : index;
   87: }
   88: 
   89: QemuOpts *drive_def(const char *optstr)
   90: {
   91:     return qemu_opts_parse(qemu_find_opts("drive"), optstr, 0);
   92: }
   93: 
   94: QemuOpts *drive_add(BlockInterfaceType type, int index, const char *file,
   95:                     const char *optstr)
   96: {
   97:     QemuOpts *opts;
   98:     char buf[32];
   99: 
  100:     opts = drive_def(optstr);
  101:     if (!opts) {
  102:         return NULL;
  103:     }
  104:     if (type != IF_DEFAULT) {
  105:         qemu_opt_set(opts, "if", if_name[type]);
  106:     }
  107:     if (index >= 0) {
  108:         snprintf(buf, sizeof(buf), "%d", index);
  109:         qemu_opt_set(opts, "index", buf);
  110:     }
  111:     if (file)
  112:         qemu_opt_set(opts, "file", file);
  113:     return opts;
  114: }
  115: 
  116: DriveInfo *drive_get(BlockInterfaceType type, int bus, int unit)
  117: {
  118:     DriveInfo *dinfo;
  119: 
  120:     /* seek interface, bus and unit */
  121: 
  122:     QTAILQ_FOREACH(dinfo, &drives, next) {
  123:         if (dinfo->type == type &&
  124: 	    dinfo->bus == bus &&
  125: 	    dinfo->unit == unit)
  126:             return dinfo;
  127:     }
  128: 
  129:     return NULL;
  130: }
  131: 
  132: DriveInfo *drive_get_by_index(BlockInterfaceType type, int index)
  133: {
  134:     return drive_get(type,
  135:                      drive_index_to_bus_id(type, index),
  136:                      drive_index_to_unit_id(type, index));
  137: }
  138: 
  139: int drive_get_max_bus(BlockInterfaceType type)
  140: {
  141:     int max_bus;
  142:     DriveInfo *dinfo;
  143: 
  144:     max_bus = -1;
  145:     QTAILQ_FOREACH(dinfo, &drives, next) {
  146:         if(dinfo->type == type &&
  147:            dinfo->bus > max_bus)
  148:             max_bus = dinfo->bus;
  149:     }
  150:     return max_bus;
  151: }
  152: 
  153: /* Get a block device.  This should only be used for single-drive devices
  154:    (e.g. SD/Floppy/MTD).  Multi-disk devices (scsi/ide) should use the
  155:    appropriate bus.  */
  156: DriveInfo *drive_get_next(BlockInterfaceType type)
  157: {
  158:     static int next_block_unit[IF_COUNT];
  159: 
  160:     return drive_get(type, 0, next_block_unit[type]++);
  161: }
  162: 
  163: DriveInfo *drive_get_by_blockdev(BlockDriverState *bs)
  164: {
  165:     DriveInfo *dinfo;
  166: 
  167:     QTAILQ_FOREACH(dinfo, &drives, next) {
  168:         if (dinfo->bdrv == bs) {
  169:             return dinfo;
  170:         }
  171:     }
  172:     return NULL;
  173: }
  174: 
  175: static void bdrv_format_print(void *opaque, const char *name)
  176: {
  177:     error_printf(" %s", name);
  178: }
  179: 
  180: static void drive_uninit(DriveInfo *dinfo)
  181: {
  182:     qemu_opts_del(dinfo->opts);
  183:     bdrv_delete(dinfo->bdrv);
  184:     g_free(dinfo->id);
  185:     QTAILQ_REMOVE(&drives, dinfo, next);
  186:     g_free(dinfo);
  187: }
  188: 
  189: void drive_put_ref(DriveInfo *dinfo)
  190: {
  191:     assert(dinfo->refcount);
  192:     if (--dinfo->refcount == 0) {
  193:         drive_uninit(dinfo);
  194:     }
  195: }
  196: 
  197: void drive_get_ref(DriveInfo *dinfo)
  198: {
  199:     dinfo->refcount++;
  200: }
  201: 
  202: static int parse_block_error_action(const char *buf, int is_read)
  203: {
  204:     if (!strcmp(buf, "ignore")) {
  205:         return BLOCK_ERR_IGNORE;
  206:     } else if (!is_read && !strcmp(buf, "enospc")) {
  207:         return BLOCK_ERR_STOP_ENOSPC;
  208:     } else if (!strcmp(buf, "stop")) {
  209:         return BLOCK_ERR_STOP_ANY;
  210:     } else if (!strcmp(buf, "report")) {
  211:         return BLOCK_ERR_REPORT;
  212:     } else {
  213:         error_report("'%s' invalid %s error action",
  214:                      buf, is_read ? "read" : "write");
  215:         return -1;
  216:     }
  217: }
  218: 
  219: DriveInfo *drive_init(QemuOpts *opts, int default_to_scsi)
  220: {
  221:     const char *buf;
  222:     const char *file = NULL;
  223:     char devname[128];
  224:     const char *serial;
  225:     const char *mediastr = "";
  226:     BlockInterfaceType type;
  227:     enum { MEDIA_DISK, MEDIA_CDROM } media;
  228:     int bus_id, unit_id;
  229:     int cyls, heads, secs, translation;
  230:     BlockDriver *drv = NULL;
  231:     int max_devs;
  232:     int index;
  233:     int ro = 0;
  234:     int bdrv_flags = 0;
  235:     int on_read_error, on_write_error;
  236:     const char *devaddr;
  237:     DriveInfo *dinfo;
  238:     int snapshot = 0;
  239:     int ret;
  240: 
  241:     translation = BIOS_ATA_TRANSLATION_AUTO;
  242:     media = MEDIA_DISK;
  243: 
  244:     /* extract parameters */
  245:     bus_id  = qemu_opt_get_number(opts, "bus", 0);
  246:     unit_id = qemu_opt_get_number(opts, "unit", -1);
  247:     index   = qemu_opt_get_number(opts, "index", -1);
  248: 
  249:     cyls  = qemu_opt_get_number(opts, "cyls", 0);
  250:     heads = qemu_opt_get_number(opts, "heads", 0);
  251:     secs  = qemu_opt_get_number(opts, "secs", 0);
  252: 
  253:     snapshot = qemu_opt_get_bool(opts, "snapshot", 0);
  254:     ro = qemu_opt_get_bool(opts, "readonly", 0);
  255: 
  256:     file = qemu_opt_get(opts, "file");
  257:     serial = qemu_opt_get(opts, "serial");
  258: 
  259:     if ((buf = qemu_opt_get(opts, "if")) != NULL) {
  260:         pstrcpy(devname, sizeof(devname), buf);
  261:         for (type = 0; type < IF_COUNT && strcmp(buf, if_name[type]); type++)
  262:             ;
  263:         if (type == IF_COUNT) {
  264:             error_report("unsupported bus type '%s'", buf);
  265:             return NULL;
  266: 	}
  267:     } else {
  268:         type = default_to_scsi ? IF_SCSI : IF_IDE;
  269:         pstrcpy(devname, sizeof(devname), if_name[type]);
  270:     }
  271: 
  272:     max_devs = if_max_devs[type];
  273: 
  274:     if (cyls || heads || secs) {
  275:         if (cyls < 1 || (type == IF_IDE && cyls > 16383)) {
  276:             error_report("invalid physical cyls number");
  277: 	    return NULL;
  278: 	}
  279:         if (heads < 1 || (type == IF_IDE && heads > 16)) {
  280:             error_report("invalid physical heads number");
  281: 	    return NULL;
  282: 	}
  283:         if (secs < 1 || (type == IF_IDE && secs > 63)) {
  284:             error_report("invalid physical secs number");
  285: 	    return NULL;
  286: 	}
  287:     }
  288: 
  289:     if ((buf = qemu_opt_get(opts, "trans")) != NULL) {
  290:         if (!cyls) {
  291:             error_report("'%s' trans must be used with cyls, heads and secs",
  292:                          buf);
  293:             return NULL;
  294:         }
  295:         if (!strcmp(buf, "none"))
  296:             translation = BIOS_ATA_TRANSLATION_NONE;
  297:         else if (!strcmp(buf, "lba"))
  298:             translation = BIOS_ATA_TRANSLATION_LBA;
  299:         else if (!strcmp(buf, "auto"))
  300:             translation = BIOS_ATA_TRANSLATION_AUTO;
  301: 	else {
  302:             error_report("'%s' invalid translation type", buf);
  303: 	    return NULL;
  304: 	}
  305:     }
  306: 
  307:     if ((buf = qemu_opt_get(opts, "media")) != NULL) {
  308:         if (!strcmp(buf, "disk")) {
  309: 	    media = MEDIA_DISK;
  310: 	} else if (!strcmp(buf, "cdrom")) {
  311:             if (cyls || secs || heads) {
  312:                 error_report("CHS can't be set with media=%s", buf);
  313: 	        return NULL;
  314:             }
  315: 	    media = MEDIA_CDROM;
  316: 	} else {
  317: 	    error_report("'%s' invalid media", buf);
  318: 	    return NULL;
  319: 	}
  320:     }
  321: 
  322:     if ((buf = qemu_opt_get(opts, "cache")) != NULL) {
  323:         if (bdrv_parse_cache_flags(buf, &bdrv_flags) != 0) {
  324:             error_report("invalid cache option");
  325:             return NULL;
  326:         }
  327:     }
  328: 
  329: #ifdef CONFIG_LINUX_AIO
  330:     if ((buf = qemu_opt_get(opts, "aio")) != NULL) {
  331:         if (!strcmp(buf, "native")) {
  332:             bdrv_flags |= BDRV_O_NATIVE_AIO;
  333:         } else if (!strcmp(buf, "threads")) {
  334:             /* this is the default */
  335:         } else {
  336:            error_report("invalid aio option");
  337:            return NULL;
  338:         }
  339:     }
  340: #endif
  341: 
  342:     if ((buf = qemu_opt_get(opts, "format")) != NULL) {
  343:        if (strcmp(buf, "?") == 0) {
  344:            error_printf("Supported formats:");
  345:            bdrv_iterate_format(bdrv_format_print, NULL);
  346:            error_printf("\n");
  347:            return NULL;
  348:         }
  349:         drv = bdrv_find_whitelisted_format(buf);
  350:         if (!drv) {
  351:             error_report("'%s' invalid format", buf);
  352:             return NULL;
  353:         }
  354:     }
  355: 
  356:     on_write_error = BLOCK_ERR_STOP_ENOSPC;
  357:     if ((buf = qemu_opt_get(opts, "werror")) != NULL) {
  358:         if (type != IF_IDE && type != IF_SCSI && type != IF_VIRTIO && type != IF_NONE) {
  359:             error_report("werror is not supported by this bus type");
  360:             return NULL;
  361:         }
  362: 
  363:         on_write_error = parse_block_error_action(buf, 0);
  364:         if (on_write_error < 0) {
  365:             return NULL;
  366:         }
  367:     }
  368: 
  369:     on_read_error = BLOCK_ERR_REPORT;
  370:     if ((buf = qemu_opt_get(opts, "rerror")) != NULL) {
  371:         if (type != IF_IDE && type != IF_VIRTIO && type != IF_SCSI && type != IF_NONE) {
  372:             error_report("rerror is not supported by this bus type");
  373:             return NULL;
  374:         }
  375: 
  376:         on_read_error = parse_block_error_action(buf, 1);
  377:         if (on_read_error < 0) {
  378:             return NULL;
  379:         }
  380:     }
  381: 
  382:     if ((devaddr = qemu_opt_get(opts, "addr")) != NULL) {
  383:         if (type != IF_VIRTIO) {
  384:             error_report("addr is not supported by this bus type");
  385:             return NULL;
  386:         }
  387:     }
  388: 
  389:     /* compute bus and unit according index */
  390: 
  391:     if (index != -1) {
  392:         if (bus_id != 0 || unit_id != -1) {
  393:             error_report("index cannot be used with bus and unit");
  394:             return NULL;
  395:         }
  396:         bus_id = drive_index_to_bus_id(type, index);
  397:         unit_id = drive_index_to_unit_id(type, index);
  398:     }
  399: 
  400:     /* if user doesn't specify a unit_id,
  401:      * try to find the first free
  402:      */
  403: 
  404:     if (unit_id == -1) {
  405:        unit_id = 0;
  406:        while (drive_get(type, bus_id, unit_id) != NULL) {
  407:            unit_id++;
  408:            if (max_devs && unit_id >= max_devs) {
  409:                unit_id -= max_devs;
  410:                bus_id++;
  411:            }
  412:        }
  413:     }
  414: 
  415:     /* check unit id */
  416: 
  417:     if (max_devs && unit_id >= max_devs) {
  418:         error_report("unit %d too big (max is %d)",
  419:                      unit_id, max_devs - 1);
  420:         return NULL;
  421:     }
  422: 
  423:     /*
  424:      * catch multiple definitions
  425:      */
  426: 
  427:     if (drive_get(type, bus_id, unit_id) != NULL) {
  428:         error_report("drive with bus=%d, unit=%d (index=%d) exists",
  429:                      bus_id, unit_id, index);
  430:         return NULL;
  431:     }
  432: 
  433:     /* init */
  434: 
  435:     dinfo = g_malloc0(sizeof(*dinfo));
  436:     if ((buf = qemu_opts_id(opts)) != NULL) {
  437:         dinfo->id = g_strdup(buf);
  438:     } else {
  439:         /* no id supplied -> create one */
  440:         dinfo->id = g_malloc0(32);
  441:         if (type == IF_IDE || type == IF_SCSI)
  442:             mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd";
  443:         if (max_devs)
  444:             snprintf(dinfo->id, 32, "%s%i%s%i",
  445:                      devname, bus_id, mediastr, unit_id);
  446:         else
  447:             snprintf(dinfo->id, 32, "%s%s%i",
  448:                      devname, mediastr, unit_id);
  449:     }
  450:     dinfo->bdrv = bdrv_new(dinfo->id);
  451:     dinfo->devaddr = devaddr;
  452:     dinfo->type = type;
  453:     dinfo->bus = bus_id;
  454:     dinfo->unit = unit_id;
  455:     dinfo->opts = opts;
  456:     dinfo->refcount = 1;
  457:     if (serial)
  458:         strncpy(dinfo->serial, serial, sizeof(dinfo->serial) - 1);
  459:     QTAILQ_INSERT_TAIL(&drives, dinfo, next);
  460: 
  461:     bdrv_set_on_error(dinfo->bdrv, on_read_error, on_write_error);
  462: 
  463:     switch(type) {
  464:     case IF_IDE:
  465:     case IF_SCSI:
  466:     case IF_XEN:
  467:     case IF_NONE:
  468:         switch(media) {
  469: 	case MEDIA_DISK:
  470:             if (cyls != 0) {
  471:                 bdrv_set_geometry_hint(dinfo->bdrv, cyls, heads, secs);
  472:                 bdrv_set_translation_hint(dinfo->bdrv, translation);
  473:             }
  474: 	    break;
  475: 	case MEDIA_CDROM:
  476:             dinfo->media_cd = 1;
  477: 	    break;
  478: 	}
  479:         break;
  480:     case IF_SD:
  481:     case IF_FLOPPY:
  482:     case IF_PFLASH:
  483:     case IF_MTD:
  484:         break;
  485:     case IF_VIRTIO:
  486:         /* add virtio block device */
  487:         opts = qemu_opts_create(qemu_find_opts("device"), NULL, 0);
  488:         qemu_opt_set(opts, "driver", "virtio-blk");
  489:         qemu_opt_set(opts, "drive", dinfo->id);
  490:         if (devaddr)
  491:             qemu_opt_set(opts, "addr", devaddr);
  492:         break;
  493:     default:
  494:         abort();
  495:     }
  496:     if (!file || !*file) {
  497:         return dinfo;
  498:     }
  499:     if (snapshot) {
  500:         /* always use cache=unsafe with snapshot */
  501:         bdrv_flags &= ~BDRV_O_CACHE_MASK;
  502:         bdrv_flags |= (BDRV_O_SNAPSHOT|BDRV_O_CACHE_WB|BDRV_O_NO_FLUSH);
  503:     }
  504: 
  505:     if (media == MEDIA_CDROM) {
  506:         /* CDROM is fine for any interface, don't check.  */
  507:         ro = 1;
  508:     } else if (ro == 1) {
  509:         if (type != IF_SCSI && type != IF_VIRTIO && type != IF_FLOPPY && type != IF_NONE) {
  510:             error_report("readonly not supported by this bus type");
  511:             goto err;
  512:         }
  513:     }
  514: 
  515:     bdrv_flags |= ro ? 0 : BDRV_O_RDWR;
  516: 
  517:     ret = bdrv_open(dinfo->bdrv, file, bdrv_flags, drv);
  518:     if (ret < 0) {
  519:         error_report("could not open disk image %s: %s",
  520:                      file, strerror(-ret));
  521:         goto err;
  522:     }
  523: 
  524:     if (bdrv_key_required(dinfo->bdrv))
  525:         autostart = 0;
  526:     return dinfo;
  527: 
  528: err:
  529:     bdrv_delete(dinfo->bdrv);
  530:     g_free(dinfo->id);
  531:     QTAILQ_REMOVE(&drives, dinfo, next);
  532:     g_free(dinfo);
  533:     return NULL;
  534: }
  535: 
  536: void do_commit(Monitor *mon, const QDict *qdict)
  537: {
  538:     const char *device = qdict_get_str(qdict, "device");
  539:     BlockDriverState *bs;
  540: 
  541:     if (!strcmp(device, "all")) {
  542:         bdrv_commit_all();
  543:     } else {
  544:         bs = bdrv_find(device);
  545:         if (!bs) {
  546:             qerror_report(QERR_DEVICE_NOT_FOUND, device);
  547:             return;
  548:         }
  549:         bdrv_commit(bs);
  550:     }
  551: }
  552: 
  553: int do_snapshot_blkdev(Monitor *mon, const QDict *qdict, QObject **ret_data)
  554: {
  555:     const char *device = qdict_get_str(qdict, "device");
  556:     const char *filename = qdict_get_try_str(qdict, "snapshot-file");
  557:     const char *format = qdict_get_try_str(qdict, "format");
  558:     BlockDriverState *bs;
  559:     BlockDriver *drv, *old_drv, *proto_drv;
  560:     int ret = 0;
  561:     int flags;
  562:     char old_filename[1024];
  563: 
  564:     if (!filename) {
  565:         qerror_report(QERR_MISSING_PARAMETER, "snapshot-file");
  566:         ret = -1;
  567:         goto out;
  568:     }
  569: 
  570:     bs = bdrv_find(device);
  571:     if (!bs) {
  572:         qerror_report(QERR_DEVICE_NOT_FOUND, device);
  573:         ret = -1;
  574:         goto out;
  575:     }
  576: 
  577:     pstrcpy(old_filename, sizeof(old_filename), bs->filename);
  578: 
  579:     old_drv = bs->drv;
  580:     flags = bs->open_flags;
  581: 
  582:     if (!format) {
  583:         format = "qcow2";
  584:     }
  585: 
  586:     drv = bdrv_find_format(format);
  587:     if (!drv) {
  588:         qerror_report(QERR_INVALID_BLOCK_FORMAT, format);
  589:         ret = -1;
  590:         goto out;
  591:     }
  592: 
  593:     proto_drv = bdrv_find_protocol(filename);
  594:     if (!proto_drv) {
  595:         qerror_report(QERR_INVALID_BLOCK_FORMAT, format);
  596:         ret = -1;
  597:         goto out;
  598:     }
  599: 
  600:     ret = bdrv_img_create(filename, format, bs->filename,
  601:                           bs->drv->format_name, NULL, -1, flags);
  602:     if (ret) {
  603:         goto out;
  604:     }
  605: 
  606:     qemu_aio_flush();
  607:     bdrv_flush(bs);
  608: 
  609:     bdrv_close(bs);
  610:     ret = bdrv_open(bs, filename, flags, drv);
  611:     /*
  612:      * If reopening the image file we just created fails, fall back
  613:      * and try to re-open the original image. If that fails too, we
  614:      * are in serious trouble.
  615:      */
  616:     if (ret != 0) {
  617:         ret = bdrv_open(bs, old_filename, flags, old_drv);
  618:         if (ret != 0) {
  619:             qerror_report(QERR_OPEN_FILE_FAILED, old_filename);
  620:         } else {
  621:             qerror_report(QERR_OPEN_FILE_FAILED, filename);
  622:         }
  623:     }
  624: out:
  625:     if (ret) {
  626:         ret = -1;
  627:     }
  628: 
  629:     return ret;
  630: }
  631: 
  632: static int eject_device(Monitor *mon, BlockDriverState *bs, int force)
  633: {
  634:     if (!bdrv_dev_has_removable_media(bs)) {
  635:         qerror_report(QERR_DEVICE_NOT_REMOVABLE, bdrv_get_device_name(bs));
  636:         return -1;
  637:     }
  638:     if (bdrv_dev_is_medium_locked(bs) && !bdrv_dev_is_tray_open(bs)) {
  639:         bdrv_dev_eject_request(bs, force);
  640:         if (!force) {
  641:             qerror_report(QERR_DEVICE_LOCKED, bdrv_get_device_name(bs));
  642:             return -1;
  643:         }
  644:     }
  645:     bdrv_close(bs);
  646:     return 0;
  647: }
  648: 
  649: int do_eject(Monitor *mon, const QDict *qdict, QObject **ret_data)
  650: {
  651:     BlockDriverState *bs;
  652:     int force = qdict_get_try_bool(qdict, "force", 0);
  653:     const char *filename = qdict_get_str(qdict, "device");
  654: 
  655:     bs = bdrv_find(filename);
  656:     if (!bs) {
  657:         qerror_report(QERR_DEVICE_NOT_FOUND, filename);
  658:         return -1;
  659:     }
  660:     return eject_device(mon, bs, force);
  661: }
  662: 
  663: int do_block_set_passwd(Monitor *mon, const QDict *qdict,
  664:                         QObject **ret_data)
  665: {
  666:     BlockDriverState *bs;
  667:     int err;
  668: 
  669:     bs = bdrv_find(qdict_get_str(qdict, "device"));
  670:     if (!bs) {
  671:         qerror_report(QERR_DEVICE_NOT_FOUND, qdict_get_str(qdict, "device"));
  672:         return -1;
  673:     }
  674: 
  675:     err = bdrv_set_key(bs, qdict_get_str(qdict, "password"));
  676:     if (err == -EINVAL) {
  677:         qerror_report(QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs));
  678:         return -1;
  679:     } else if (err < 0) {
  680:         qerror_report(QERR_INVALID_PASSWORD);
  681:         return -1;
  682:     }
  683: 
  684:     return 0;
  685: }
  686: 
  687: int do_change_block(Monitor *mon, const char *device,
  688:                     const char *filename, const char *fmt)
  689: {
  690:     BlockDriverState *bs;
  691:     BlockDriver *drv = NULL;
  692:     int bdrv_flags;
  693: 
  694:     bs = bdrv_find(device);
  695:     if (!bs) {
  696:         qerror_report(QERR_DEVICE_NOT_FOUND, device);
  697:         return -1;
  698:     }
  699:     if (fmt) {
  700:         drv = bdrv_find_whitelisted_format(fmt);
  701:         if (!drv) {
  702:             qerror_report(QERR_INVALID_BLOCK_FORMAT, fmt);
  703:             return -1;
  704:         }
  705:     }
  706:     if (eject_device(mon, bs, 0) < 0) {
  707:         return -1;
  708:     }
  709:     bdrv_flags = bdrv_is_read_only(bs) ? 0 : BDRV_O_RDWR;
  710:     bdrv_flags |= bdrv_is_snapshot(bs) ? BDRV_O_SNAPSHOT : 0;
  711:     if (bdrv_open(bs, filename, bdrv_flags, drv) < 0) {
  712:         qerror_report(QERR_OPEN_FILE_FAILED, filename);
  713:         return -1;
  714:     }
  715:     return monitor_read_bdrv_key_start(mon, bs, NULL, NULL);
  716: }
  717: 
  718: int do_drive_del(Monitor *mon, const QDict *qdict, QObject **ret_data)
  719: {
  720:     const char *id = qdict_get_str(qdict, "id");
  721:     BlockDriverState *bs;
  722: 
  723:     bs = bdrv_find(id);
  724:     if (!bs) {
  725:         qerror_report(QERR_DEVICE_NOT_FOUND, id);
  726:         return -1;
  727:     }
  728:     if (bdrv_in_use(bs)) {
  729:         qerror_report(QERR_DEVICE_IN_USE, id);
  730:         return -1;
  731:     }
  732: 
  733:     /* quiesce block driver; prevent further io */
  734:     qemu_aio_flush();
  735:     bdrv_flush(bs);
  736:     bdrv_close(bs);
  737: 
  738:     /* if we have a device attached to this BlockDriverState
  739:      * then we need to make the drive anonymous until the device
  740:      * can be removed.  If this is a drive with no device backing
  741:      * then we can just get rid of the block driver state right here.
  742:      */
  743:     if (bdrv_get_attached_dev(bs)) {
  744:         bdrv_make_anon(bs);
  745:     } else {
  746:         drive_uninit(drive_get_by_blockdev(bs));
  747:     }
  748: 
  749:     return 0;
  750: }
  751: 
  752: /*
  753:  * XXX: replace the QERR_UNDEFINED_ERROR errors with real values once the
  754:  * existing QERR_ macro mess is cleaned up.  A good example for better
  755:  * error reports can be found in the qemu-img resize code.
  756:  */
  757: int do_block_resize(Monitor *mon, const QDict *qdict, QObject **ret_data)
  758: {
  759:     const char *device = qdict_get_str(qdict, "device");
  760:     int64_t size = qdict_get_int(qdict, "size");
  761:     BlockDriverState *bs;
  762: 
  763:     bs = bdrv_find(device);
  764:     if (!bs) {
  765:         qerror_report(QERR_DEVICE_NOT_FOUND, device);
  766:         return -1;
  767:     }
  768: 
  769:     if (size < 0) {
  770:         qerror_report(QERR_UNDEFINED_ERROR);
  771:         return -1;
  772:     }
  773: 
  774:     if (bdrv_truncate(bs, size)) {
  775:         qerror_report(QERR_UNDEFINED_ERROR);
  776:         return -1;
  777:     }
  778: 
  779:     return 0;
  780: }

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