Annotation of qemu/blockdev.c, revision 1.1.1.5

1.1       root        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"
1.1.1.2   root       17: #include "block_int.h"
1.1       root       18: 
                     19: static QTAILQ_HEAD(drivelist, DriveInfo) drives = QTAILQ_HEAD_INITIALIZER(drives);
                     20: 
1.1.1.2   root       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: 
1.1       root       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: 
1.1.1.2   root       63:     if (dinfo) {
                     64:         dinfo->auto_del = 1;
                     65:     }
1.1       root       66: }
                     67: 
                     68: void blockdev_auto_del(BlockDriverState *bs)
                     69: {
                     70:     DriveInfo *dinfo = drive_get_by_blockdev(bs);
                     71: 
1.1.1.2   root       72:     if (dinfo && dinfo->auto_del) {
                     73:         drive_put_ref(dinfo);
1.1       root       74:     }
                     75: }
                     76: 
1.1.1.2   root       77: static int drive_index_to_bus_id(BlockInterfaceType type, int index)
1.1       root       78: {
1.1.1.2   root       79:     int max_devs = if_max_devs[type];
                     80:     return max_devs ? index / max_devs : 0;
                     81: }
1.1       root       82: 
1.1.1.2   root       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: }
1.1       root       88: 
1.1.1.2   root       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);
1.1       root      101:     if (!opts) {
                    102:         return NULL;
                    103:     }
1.1.1.2   root      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:     }
1.1       root      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: 
1.1.1.2   root      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: 
1.1       root      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: 
1.1.1.2   root      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: 
1.1       root      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: {
1.1.1.2   root      177:     error_printf(" %s", name);
1.1       root      178: }
                    179: 
1.1.1.2   root      180: static void drive_uninit(DriveInfo *dinfo)
1.1       root      181: {
                    182:     qemu_opts_del(dinfo->opts);
                    183:     bdrv_delete(dinfo->bdrv);
1.1.1.5 ! root      184:     g_free(dinfo->id);
1.1       root      185:     QTAILQ_REMOVE(&drives, dinfo, next);
1.1.1.5 ! root      186:     g_free(dinfo);
1.1       root      187: }
                    188: 
1.1.1.2   root      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: 
1.1       root      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 {
1.1.1.2   root      213:         error_report("'%s' invalid %s error action",
                    214:                      buf, is_read ? "read" : "write");
1.1       root      215:         return -1;
                    216:     }
                    217: }
                    218: 
1.1.1.2   root      219: DriveInfo *drive_init(QemuOpts *opts, int default_to_scsi)
1.1       root      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);
1.1.1.2   root      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);
1.1       root      265:             return NULL;
                    266:        }
1.1.1.4   root      267:     } else {
                    268:         type = default_to_scsi ? IF_SCSI : IF_IDE;
                    269:         pstrcpy(devname, sizeof(devname), if_name[type]);
1.1       root      270:     }
1.1.1.4   root      271: 
1.1.1.2   root      272:     max_devs = if_max_devs[type];
1.1       root      273: 
                    274:     if (cyls || heads || secs) {
                    275:         if (cyls < 1 || (type == IF_IDE && cyls > 16383)) {
1.1.1.2   root      276:             error_report("invalid physical cyls number");
1.1       root      277:            return NULL;
                    278:        }
                    279:         if (heads < 1 || (type == IF_IDE && heads > 16)) {
1.1.1.2   root      280:             error_report("invalid physical heads number");
1.1       root      281:            return NULL;
                    282:        }
                    283:         if (secs < 1 || (type == IF_IDE && secs > 63)) {
1.1.1.2   root      284:             error_report("invalid physical secs number");
1.1       root      285:            return NULL;
                    286:        }
                    287:     }
                    288: 
                    289:     if ((buf = qemu_opt_get(opts, "trans")) != NULL) {
                    290:         if (!cyls) {
1.1.1.4   root      291:             error_report("'%s' trans must be used with cyls, heads and secs",
1.1.1.2   root      292:                          buf);
1.1       root      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 {
1.1.1.2   root      302:             error_report("'%s' invalid translation type", buf);
1.1       root      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) {
1.1.1.4   root      312:                 error_report("CHS can't be set with media=%s", buf);
1.1       root      313:                return NULL;
                    314:             }
                    315:            media = MEDIA_CDROM;
                    316:        } else {
1.1.1.2   root      317:            error_report("'%s' invalid media", buf);
1.1       root      318:            return NULL;
                    319:        }
                    320:     }
                    321: 
                    322:     if ((buf = qemu_opt_get(opts, "cache")) != NULL) {
1.1.1.5 ! root      323:         if (bdrv_parse_cache_flags(buf, &bdrv_flags) != 0) {
        !           324:             error_report("invalid cache option");
        !           325:             return NULL;
1.1       root      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 {
1.1.1.2   root      336:            error_report("invalid aio option");
1.1       root      337:            return NULL;
                    338:         }
                    339:     }
                    340: #endif
                    341: 
                    342:     if ((buf = qemu_opt_get(opts, "format")) != NULL) {
                    343:        if (strcmp(buf, "?") == 0) {
1.1.1.2   root      344:            error_printf("Supported formats:");
                    345:            bdrv_iterate_format(bdrv_format_print, NULL);
                    346:            error_printf("\n");
                    347:            return NULL;
1.1       root      348:         }
                    349:         drv = bdrv_find_whitelisted_format(buf);
                    350:         if (!drv) {
1.1.1.2   root      351:             error_report("'%s' invalid format", buf);
1.1       root      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) {
1.1.1.2   root      359:             error_report("werror is not supported by this bus type");
1.1       root      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) {
1.1.1.2   root      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");
1.1       root      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) {
1.1.1.2   root      384:             error_report("addr is not supported by this bus type");
1.1       root      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) {
1.1.1.2   root      393:             error_report("index cannot be used with bus and unit");
1.1       root      394:             return NULL;
                    395:         }
1.1.1.2   root      396:         bus_id = drive_index_to_bus_id(type, index);
                    397:         unit_id = drive_index_to_unit_id(type, index);
1.1       root      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) {
1.1.1.2   root      418:         error_report("unit %d too big (max is %d)",
                    419:                      unit_id, max_devs - 1);
1.1       root      420:         return NULL;
                    421:     }
                    422: 
                    423:     /*
1.1.1.2   root      424:      * catch multiple definitions
1.1       root      425:      */
                    426: 
                    427:     if (drive_get(type, bus_id, unit_id) != NULL) {
1.1.1.2   root      428:         error_report("drive with bus=%d, unit=%d (index=%d) exists",
                    429:                      bus_id, unit_id, index);
1.1       root      430:         return NULL;
                    431:     }
                    432: 
                    433:     /* init */
                    434: 
1.1.1.5 ! root      435:     dinfo = g_malloc0(sizeof(*dinfo));
1.1       root      436:     if ((buf = qemu_opts_id(opts)) != NULL) {
1.1.1.5 ! root      437:         dinfo->id = g_strdup(buf);
1.1       root      438:     } else {
                    439:         /* no id supplied -> create one */
1.1.1.5 ! root      440:         dinfo->id = g_malloc0(32);
1.1       root      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;
1.1.1.2   root      456:     dinfo->refcount = 1;
1.1       root      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:
1.1.1.4   root      476:             dinfo->media_cd = 1;
1.1       root      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 */
1.1.1.2   root      487:         opts = qemu_opts_create(qemu_find_opts("device"), NULL, 0);
1.1.1.4   root      488:         qemu_opt_set(opts, "driver", "virtio-blk");
1.1       root      489:         qemu_opt_set(opts, "drive", dinfo->id);
                    490:         if (devaddr)
                    491:             qemu_opt_set(opts, "addr", devaddr);
                    492:         break;
1.1.1.2   root      493:     default:
1.1       root      494:         abort();
                    495:     }
                    496:     if (!file || !*file) {
1.1.1.2   root      497:         return dinfo;
1.1       root      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) {
1.1.1.2   root      510:             error_report("readonly not supported by this bus type");
                    511:             goto err;
1.1       root      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) {
1.1.1.2   root      519:         error_report("could not open disk image %s: %s",
                    520:                      file, strerror(-ret));
                    521:         goto err;
1.1       root      522:     }
                    523: 
                    524:     if (bdrv_key_required(dinfo->bdrv))
                    525:         autostart = 0;
                    526:     return dinfo;
1.1.1.2   root      527: 
                    528: err:
                    529:     bdrv_delete(dinfo->bdrv);
1.1.1.5 ! root      530:     g_free(dinfo->id);
1.1.1.2   root      531:     QTAILQ_REMOVE(&drives, dinfo, next);
1.1.1.5 ! root      532:     g_free(dinfo);
1.1.1.2   root      533:     return NULL;
1.1       root      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: 
1.1.1.2   root      553: int do_snapshot_blkdev(Monitor *mon, const QDict *qdict, QObject **ret_data)
                    554: {
                    555:     const char *device = qdict_get_str(qdict, "device");
1.1.1.4   root      556:     const char *filename = qdict_get_try_str(qdict, "snapshot-file");
1.1.1.2   root      557:     const char *format = qdict_get_try_str(qdict, "format");
                    558:     BlockDriverState *bs;
1.1.1.4   root      559:     BlockDriver *drv, *old_drv, *proto_drv;
1.1.1.2   root      560:     int ret = 0;
                    561:     int flags;
1.1.1.4   root      562:     char old_filename[1024];
1.1.1.2   root      563: 
                    564:     if (!filename) {
1.1.1.4   root      565:         qerror_report(QERR_MISSING_PARAMETER, "snapshot-file");
1.1.1.2   root      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: 
1.1.1.4   root      577:     pstrcpy(old_filename, sizeof(old_filename), bs->filename);
                    578: 
                    579:     old_drv = bs->drv;
                    580:     flags = bs->open_flags;
                    581: 
1.1.1.2   root      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,
1.1.1.4   root      601:                           bs->drv->format_name, NULL, -1, flags);
1.1.1.2   root      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:     /*
1.1.1.4   root      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.
1.1.1.2   root      615:      */
                    616:     if (ret != 0) {
1.1.1.4   root      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:         }
1.1.1.2   root      623:     }
                    624: out:
                    625:     if (ret) {
                    626:         ret = -1;
                    627:     }
                    628: 
                    629:     return ret;
                    630: }
                    631: 
1.1       root      632: static int eject_device(Monitor *mon, BlockDriverState *bs, int force)
                    633: {
1.1.1.5 ! root      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) {
1.1       root      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: }
1.1.1.2   root      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: 
1.1.1.5 ! root      738:     /* if we have a device attached to this BlockDriverState
1.1.1.3   root      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:      */
1.1.1.5 ! root      743:     if (bdrv_get_attached_dev(bs)) {
1.1.1.3   root      744:         bdrv_make_anon(bs);
                    745:     } else {
                    746:         drive_uninit(drive_get_by_blockdev(bs));
1.1.1.2   root      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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