File:  [Qemu by Fabrice Bellard] / qemu / blockdev.c
Revision 1.1.1.4 (vendor branch): download - view: text, annotated - select for diffs
Tue Apr 24 18:55:49 2018 UTC (3 years, 1 month ago) by root
Branches: qemu, MAIN
CVS tags: qemu1000, qemu0151, HEAD
qemu 0.15.1

    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 "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:     media = MEDIA_DISK;
  244: 
  245:     /* extract parameters */
  246:     bus_id  = qemu_opt_get_number(opts, "bus", 0);
  247:     unit_id = qemu_opt_get_number(opts, "unit", -1);
  248:     index   = qemu_opt_get_number(opts, "index", -1);
  249: 
  250:     cyls  = qemu_opt_get_number(opts, "cyls", 0);
  251:     heads = qemu_opt_get_number(opts, "heads", 0);
  252:     secs  = qemu_opt_get_number(opts, "secs", 0);
  253: 
  254:     snapshot = qemu_opt_get_bool(opts, "snapshot", 0);
  255:     ro = qemu_opt_get_bool(opts, "readonly", 0);
  256: 
  257:     file = qemu_opt_get(opts, "file");
  258:     serial = qemu_opt_get(opts, "serial");
  259: 
  260:     if ((buf = qemu_opt_get(opts, "if")) != NULL) {
  261:         pstrcpy(devname, sizeof(devname), buf);
  262:         for (type = 0; type < IF_COUNT && strcmp(buf, if_name[type]); type++)
  263:             ;
  264:         if (type == IF_COUNT) {
  265:             error_report("unsupported bus type '%s'", buf);
  266:             return NULL;
  267: 	}
  268:     } else {
  269:         type = default_to_scsi ? IF_SCSI : IF_IDE;
  270:         pstrcpy(devname, sizeof(devname), if_name[type]);
  271:     }
  272: 
  273:     max_devs = if_max_devs[type];
  274: 
  275:     if (cyls || heads || secs) {
  276:         if (cyls < 1 || (type == IF_IDE && cyls > 16383)) {
  277:             error_report("invalid physical cyls number");
  278: 	    return NULL;
  279: 	}
  280:         if (heads < 1 || (type == IF_IDE && heads > 16)) {
  281:             error_report("invalid physical heads number");
  282: 	    return NULL;
  283: 	}
  284:         if (secs < 1 || (type == IF_IDE && secs > 63)) {
  285:             error_report("invalid physical secs number");
  286: 	    return NULL;
  287: 	}
  288:     }
  289: 
  290:     if ((buf = qemu_opt_get(opts, "trans")) != NULL) {
  291:         if (!cyls) {
  292:             error_report("'%s' trans must be used with cyls, heads and secs",
  293:                          buf);
  294:             return NULL;
  295:         }
  296:         if (!strcmp(buf, "none"))
  297:             translation = BIOS_ATA_TRANSLATION_NONE;
  298:         else if (!strcmp(buf, "lba"))
  299:             translation = BIOS_ATA_TRANSLATION_LBA;
  300:         else if (!strcmp(buf, "auto"))
  301:             translation = BIOS_ATA_TRANSLATION_AUTO;
  302: 	else {
  303:             error_report("'%s' invalid translation type", buf);
  304: 	    return NULL;
  305: 	}
  306:     }
  307: 
  308:     if ((buf = qemu_opt_get(opts, "media")) != NULL) {
  309:         if (!strcmp(buf, "disk")) {
  310: 	    media = MEDIA_DISK;
  311: 	} else if (!strcmp(buf, "cdrom")) {
  312:             if (cyls || secs || heads) {
  313:                 error_report("CHS can't be set with media=%s", buf);
  314: 	        return NULL;
  315:             }
  316: 	    media = MEDIA_CDROM;
  317: 	} else {
  318: 	    error_report("'%s' invalid media", buf);
  319: 	    return NULL;
  320: 	}
  321:     }
  322: 
  323:     if ((buf = qemu_opt_get(opts, "cache")) != NULL) {
  324:         if (!strcmp(buf, "off") || !strcmp(buf, "none")) {
  325:             bdrv_flags |= BDRV_O_NOCACHE | BDRV_O_CACHE_WB;
  326:         } else if (!strcmp(buf, "writeback")) {
  327:             bdrv_flags |= BDRV_O_CACHE_WB;
  328:         } else if (!strcmp(buf, "unsafe")) {
  329:             bdrv_flags |= BDRV_O_CACHE_WB;
  330:             bdrv_flags |= BDRV_O_NO_FLUSH;
  331:         } else if (!strcmp(buf, "writethrough")) {
  332:             /* this is the default */
  333:         } else {
  334:            error_report("invalid cache option");
  335:            return NULL;
  336:         }
  337:     }
  338: 
  339: #ifdef CONFIG_LINUX_AIO
  340:     if ((buf = qemu_opt_get(opts, "aio")) != NULL) {
  341:         if (!strcmp(buf, "native")) {
  342:             bdrv_flags |= BDRV_O_NATIVE_AIO;
  343:         } else if (!strcmp(buf, "threads")) {
  344:             /* this is the default */
  345:         } else {
  346:            error_report("invalid aio option");
  347:            return NULL;
  348:         }
  349:     }
  350: #endif
  351: 
  352:     if ((buf = qemu_opt_get(opts, "format")) != NULL) {
  353:        if (strcmp(buf, "?") == 0) {
  354:            error_printf("Supported formats:");
  355:            bdrv_iterate_format(bdrv_format_print, NULL);
  356:            error_printf("\n");
  357:            return NULL;
  358:         }
  359:         drv = bdrv_find_whitelisted_format(buf);
  360:         if (!drv) {
  361:             error_report("'%s' invalid format", buf);
  362:             return NULL;
  363:         }
  364:     }
  365: 
  366:     on_write_error = BLOCK_ERR_STOP_ENOSPC;
  367:     if ((buf = qemu_opt_get(opts, "werror")) != NULL) {
  368:         if (type != IF_IDE && type != IF_SCSI && type != IF_VIRTIO && type != IF_NONE) {
  369:             error_report("werror is not supported by this bus type");
  370:             return NULL;
  371:         }
  372: 
  373:         on_write_error = parse_block_error_action(buf, 0);
  374:         if (on_write_error < 0) {
  375:             return NULL;
  376:         }
  377:     }
  378: 
  379:     on_read_error = BLOCK_ERR_REPORT;
  380:     if ((buf = qemu_opt_get(opts, "rerror")) != NULL) {
  381:         if (type != IF_IDE && type != IF_VIRTIO && type != IF_SCSI && type != IF_NONE) {
  382:             error_report("rerror is not supported by this bus type");
  383:             return NULL;
  384:         }
  385: 
  386:         on_read_error = parse_block_error_action(buf, 1);
  387:         if (on_read_error < 0) {
  388:             return NULL;
  389:         }
  390:     }
  391: 
  392:     if ((devaddr = qemu_opt_get(opts, "addr")) != NULL) {
  393:         if (type != IF_VIRTIO) {
  394:             error_report("addr is not supported by this bus type");
  395:             return NULL;
  396:         }
  397:     }
  398: 
  399:     /* compute bus and unit according index */
  400: 
  401:     if (index != -1) {
  402:         if (bus_id != 0 || unit_id != -1) {
  403:             error_report("index cannot be used with bus and unit");
  404:             return NULL;
  405:         }
  406:         bus_id = drive_index_to_bus_id(type, index);
  407:         unit_id = drive_index_to_unit_id(type, index);
  408:     }
  409: 
  410:     /* if user doesn't specify a unit_id,
  411:      * try to find the first free
  412:      */
  413: 
  414:     if (unit_id == -1) {
  415:        unit_id = 0;
  416:        while (drive_get(type, bus_id, unit_id) != NULL) {
  417:            unit_id++;
  418:            if (max_devs && unit_id >= max_devs) {
  419:                unit_id -= max_devs;
  420:                bus_id++;
  421:            }
  422:        }
  423:     }
  424: 
  425:     /* check unit id */
  426: 
  427:     if (max_devs && unit_id >= max_devs) {
  428:         error_report("unit %d too big (max is %d)",
  429:                      unit_id, max_devs - 1);
  430:         return NULL;
  431:     }
  432: 
  433:     /*
  434:      * catch multiple definitions
  435:      */
  436: 
  437:     if (drive_get(type, bus_id, unit_id) != NULL) {
  438:         error_report("drive with bus=%d, unit=%d (index=%d) exists",
  439:                      bus_id, unit_id, index);
  440:         return NULL;
  441:     }
  442: 
  443:     /* init */
  444: 
  445:     dinfo = qemu_mallocz(sizeof(*dinfo));
  446:     if ((buf = qemu_opts_id(opts)) != NULL) {
  447:         dinfo->id = qemu_strdup(buf);
  448:     } else {
  449:         /* no id supplied -> create one */
  450:         dinfo->id = qemu_mallocz(32);
  451:         if (type == IF_IDE || type == IF_SCSI)
  452:             mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd";
  453:         if (max_devs)
  454:             snprintf(dinfo->id, 32, "%s%i%s%i",
  455:                      devname, bus_id, mediastr, unit_id);
  456:         else
  457:             snprintf(dinfo->id, 32, "%s%s%i",
  458:                      devname, mediastr, unit_id);
  459:     }
  460:     dinfo->bdrv = bdrv_new(dinfo->id);
  461:     dinfo->devaddr = devaddr;
  462:     dinfo->type = type;
  463:     dinfo->bus = bus_id;
  464:     dinfo->unit = unit_id;
  465:     dinfo->opts = opts;
  466:     dinfo->refcount = 1;
  467:     if (serial)
  468:         strncpy(dinfo->serial, serial, sizeof(dinfo->serial) - 1);
  469:     QTAILQ_INSERT_TAIL(&drives, dinfo, next);
  470: 
  471:     bdrv_set_on_error(dinfo->bdrv, on_read_error, on_write_error);
  472: 
  473:     switch(type) {
  474:     case IF_IDE:
  475:     case IF_SCSI:
  476:     case IF_XEN:
  477:     case IF_NONE:
  478:         switch(media) {
  479: 	case MEDIA_DISK:
  480:             if (cyls != 0) {
  481:                 bdrv_set_geometry_hint(dinfo->bdrv, cyls, heads, secs);
  482:                 bdrv_set_translation_hint(dinfo->bdrv, translation);
  483:             }
  484: 	    break;
  485: 	case MEDIA_CDROM:
  486:             bdrv_set_removable(dinfo->bdrv, 1);
  487:             dinfo->media_cd = 1;
  488: 	    break;
  489: 	}
  490:         break;
  491:     case IF_SD:
  492:         /* FIXME: This isn't really a floppy, but it's a reasonable
  493:            approximation.  */
  494:     case IF_FLOPPY:
  495:         bdrv_set_removable(dinfo->bdrv, 1);
  496:         break;
  497:     case IF_PFLASH:
  498:     case IF_MTD:
  499:         break;
  500:     case IF_VIRTIO:
  501:         /* add virtio block device */
  502:         opts = qemu_opts_create(qemu_find_opts("device"), NULL, 0);
  503:         qemu_opt_set(opts, "driver", "virtio-blk");
  504:         qemu_opt_set(opts, "drive", dinfo->id);
  505:         if (devaddr)
  506:             qemu_opt_set(opts, "addr", devaddr);
  507:         break;
  508:     default:
  509:         abort();
  510:     }
  511:     if (!file || !*file) {
  512:         return dinfo;
  513:     }
  514:     if (snapshot) {
  515:         /* always use cache=unsafe with snapshot */
  516:         bdrv_flags &= ~BDRV_O_CACHE_MASK;
  517:         bdrv_flags |= (BDRV_O_SNAPSHOT|BDRV_O_CACHE_WB|BDRV_O_NO_FLUSH);
  518:     }
  519: 
  520:     if (media == MEDIA_CDROM) {
  521:         /* CDROM is fine for any interface, don't check.  */
  522:         ro = 1;
  523:     } else if (ro == 1) {
  524:         if (type != IF_SCSI && type != IF_VIRTIO && type != IF_FLOPPY && type != IF_NONE) {
  525:             error_report("readonly not supported by this bus type");
  526:             goto err;
  527:         }
  528:     }
  529: 
  530:     bdrv_flags |= ro ? 0 : BDRV_O_RDWR;
  531: 
  532:     ret = bdrv_open(dinfo->bdrv, file, bdrv_flags, drv);
  533:     if (ret < 0) {
  534:         error_report("could not open disk image %s: %s",
  535:                      file, strerror(-ret));
  536:         goto err;
  537:     }
  538: 
  539:     if (bdrv_key_required(dinfo->bdrv))
  540:         autostart = 0;
  541:     return dinfo;
  542: 
  543: err:
  544:     bdrv_delete(dinfo->bdrv);
  545:     qemu_free(dinfo->id);
  546:     QTAILQ_REMOVE(&drives, dinfo, next);
  547:     qemu_free(dinfo);
  548:     return NULL;
  549: }
  550: 
  551: void do_commit(Monitor *mon, const QDict *qdict)
  552: {
  553:     const char *device = qdict_get_str(qdict, "device");
  554:     BlockDriverState *bs;
  555: 
  556:     if (!strcmp(device, "all")) {
  557:         bdrv_commit_all();
  558:     } else {
  559:         bs = bdrv_find(device);
  560:         if (!bs) {
  561:             qerror_report(QERR_DEVICE_NOT_FOUND, device);
  562:             return;
  563:         }
  564:         bdrv_commit(bs);
  565:     }
  566: }
  567: 
  568: int do_snapshot_blkdev(Monitor *mon, const QDict *qdict, QObject **ret_data)
  569: {
  570:     const char *device = qdict_get_str(qdict, "device");
  571:     const char *filename = qdict_get_try_str(qdict, "snapshot-file");
  572:     const char *format = qdict_get_try_str(qdict, "format");
  573:     BlockDriverState *bs;
  574:     BlockDriver *drv, *old_drv, *proto_drv;
  575:     int ret = 0;
  576:     int flags;
  577:     char old_filename[1024];
  578: 
  579:     if (!filename) {
  580:         qerror_report(QERR_MISSING_PARAMETER, "snapshot-file");
  581:         ret = -1;
  582:         goto out;
  583:     }
  584: 
  585:     bs = bdrv_find(device);
  586:     if (!bs) {
  587:         qerror_report(QERR_DEVICE_NOT_FOUND, device);
  588:         ret = -1;
  589:         goto out;
  590:     }
  591: 
  592:     pstrcpy(old_filename, sizeof(old_filename), bs->filename);
  593: 
  594:     old_drv = bs->drv;
  595:     flags = bs->open_flags;
  596: 
  597:     if (!format) {
  598:         format = "qcow2";
  599:     }
  600: 
  601:     drv = bdrv_find_format(format);
  602:     if (!drv) {
  603:         qerror_report(QERR_INVALID_BLOCK_FORMAT, format);
  604:         ret = -1;
  605:         goto out;
  606:     }
  607: 
  608:     proto_drv = bdrv_find_protocol(filename);
  609:     if (!proto_drv) {
  610:         qerror_report(QERR_INVALID_BLOCK_FORMAT, format);
  611:         ret = -1;
  612:         goto out;
  613:     }
  614: 
  615:     ret = bdrv_img_create(filename, format, bs->filename,
  616:                           bs->drv->format_name, NULL, -1, flags);
  617:     if (ret) {
  618:         goto out;
  619:     }
  620: 
  621:     qemu_aio_flush();
  622:     bdrv_flush(bs);
  623: 
  624:     bdrv_close(bs);
  625:     ret = bdrv_open(bs, filename, flags, drv);
  626:     /*
  627:      * If reopening the image file we just created fails, fall back
  628:      * and try to re-open the original image. If that fails too, we
  629:      * are in serious trouble.
  630:      */
  631:     if (ret != 0) {
  632:         ret = bdrv_open(bs, old_filename, flags, old_drv);
  633:         if (ret != 0) {
  634:             qerror_report(QERR_OPEN_FILE_FAILED, old_filename);
  635:         } else {
  636:             qerror_report(QERR_OPEN_FILE_FAILED, filename);
  637:         }
  638:     }
  639: out:
  640:     if (ret) {
  641:         ret = -1;
  642:     }
  643: 
  644:     return ret;
  645: }
  646: 
  647: static int eject_device(Monitor *mon, BlockDriverState *bs, int force)
  648: {
  649:     if (!force) {
  650:         if (!bdrv_is_removable(bs)) {
  651:             qerror_report(QERR_DEVICE_NOT_REMOVABLE,
  652:                            bdrv_get_device_name(bs));
  653:             return -1;
  654:         }
  655:         if (bdrv_is_locked(bs)) {
  656:             qerror_report(QERR_DEVICE_LOCKED, bdrv_get_device_name(bs));
  657:             return -1;
  658:         }
  659:     }
  660:     bdrv_close(bs);
  661:     return 0;
  662: }
  663: 
  664: int do_eject(Monitor *mon, const QDict *qdict, QObject **ret_data)
  665: {
  666:     BlockDriverState *bs;
  667:     int force = qdict_get_try_bool(qdict, "force", 0);
  668:     const char *filename = qdict_get_str(qdict, "device");
  669: 
  670:     bs = bdrv_find(filename);
  671:     if (!bs) {
  672:         qerror_report(QERR_DEVICE_NOT_FOUND, filename);
  673:         return -1;
  674:     }
  675:     return eject_device(mon, bs, force);
  676: }
  677: 
  678: int do_block_set_passwd(Monitor *mon, const QDict *qdict,
  679:                         QObject **ret_data)
  680: {
  681:     BlockDriverState *bs;
  682:     int err;
  683: 
  684:     bs = bdrv_find(qdict_get_str(qdict, "device"));
  685:     if (!bs) {
  686:         qerror_report(QERR_DEVICE_NOT_FOUND, qdict_get_str(qdict, "device"));
  687:         return -1;
  688:     }
  689: 
  690:     err = bdrv_set_key(bs, qdict_get_str(qdict, "password"));
  691:     if (err == -EINVAL) {
  692:         qerror_report(QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs));
  693:         return -1;
  694:     } else if (err < 0) {
  695:         qerror_report(QERR_INVALID_PASSWORD);
  696:         return -1;
  697:     }
  698: 
  699:     return 0;
  700: }
  701: 
  702: int do_change_block(Monitor *mon, const char *device,
  703:                     const char *filename, const char *fmt)
  704: {
  705:     BlockDriverState *bs;
  706:     BlockDriver *drv = NULL;
  707:     int bdrv_flags;
  708: 
  709:     bs = bdrv_find(device);
  710:     if (!bs) {
  711:         qerror_report(QERR_DEVICE_NOT_FOUND, device);
  712:         return -1;
  713:     }
  714:     if (fmt) {
  715:         drv = bdrv_find_whitelisted_format(fmt);
  716:         if (!drv) {
  717:             qerror_report(QERR_INVALID_BLOCK_FORMAT, fmt);
  718:             return -1;
  719:         }
  720:     }
  721:     if (eject_device(mon, bs, 0) < 0) {
  722:         return -1;
  723:     }
  724:     bdrv_flags = bdrv_is_read_only(bs) ? 0 : BDRV_O_RDWR;
  725:     bdrv_flags |= bdrv_is_snapshot(bs) ? BDRV_O_SNAPSHOT : 0;
  726:     if (bdrv_open(bs, filename, bdrv_flags, drv) < 0) {
  727:         qerror_report(QERR_OPEN_FILE_FAILED, filename);
  728:         return -1;
  729:     }
  730:     return monitor_read_bdrv_key_start(mon, bs, NULL, NULL);
  731: }
  732: 
  733: int do_drive_del(Monitor *mon, const QDict *qdict, QObject **ret_data)
  734: {
  735:     const char *id = qdict_get_str(qdict, "id");
  736:     BlockDriverState *bs;
  737: 
  738:     bs = bdrv_find(id);
  739:     if (!bs) {
  740:         qerror_report(QERR_DEVICE_NOT_FOUND, id);
  741:         return -1;
  742:     }
  743:     if (bdrv_in_use(bs)) {
  744:         qerror_report(QERR_DEVICE_IN_USE, id);
  745:         return -1;
  746:     }
  747: 
  748:     /* quiesce block driver; prevent further io */
  749:     qemu_aio_flush();
  750:     bdrv_flush(bs);
  751:     bdrv_close(bs);
  752: 
  753:     /* if we have a device associated with this BlockDriverState (bs->peer)
  754:      * then we need to make the drive anonymous until the device
  755:      * can be removed.  If this is a drive with no device backing
  756:      * then we can just get rid of the block driver state right here.
  757:      */
  758:     if (bs->peer) {
  759:         bdrv_make_anon(bs);
  760:     } else {
  761:         drive_uninit(drive_get_by_blockdev(bs));
  762:     }
  763: 
  764:     return 0;
  765: }
  766: 
  767: /*
  768:  * XXX: replace the QERR_UNDEFINED_ERROR errors with real values once the
  769:  * existing QERR_ macro mess is cleaned up.  A good example for better
  770:  * error reports can be found in the qemu-img resize code.
  771:  */
  772: int do_block_resize(Monitor *mon, const QDict *qdict, QObject **ret_data)
  773: {
  774:     const char *device = qdict_get_str(qdict, "device");
  775:     int64_t size = qdict_get_int(qdict, "size");
  776:     BlockDriverState *bs;
  777: 
  778:     bs = bdrv_find(device);
  779:     if (!bs) {
  780:         qerror_report(QERR_DEVICE_NOT_FOUND, device);
  781:         return -1;
  782:     }
  783: 
  784:     if (size < 0) {
  785:         qerror_report(QERR_UNDEFINED_ERROR);
  786:         return -1;
  787:     }
  788: 
  789:     if (bdrv_truncate(bs, size)) {
  790:         qerror_report(QERR_UNDEFINED_ERROR);
  791:         return -1;
  792:     }
  793: 
  794:     return 0;
  795: }

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