static int vvfat_open(BlockDriverState *bs, QDict *options, int flags) { BDRVVVFATState *s = bs->opaque; int cyls, heads, secs; bool floppy; const char *dirname; QemuOpts *opts; Error *local_err = NULL; int ret; #ifdef DEBUG vvv = s; #endif DLOG(if (stderr == NULL) { stderr = fopen("vvfat.log", "a"); setbuf(stderr, NULL); }) opts = qemu_opts_create_nofail(&runtime_opts); qemu_opts_absorb_qdict(opts, options, &local_err); if (error_is_set(&local_err)) { qerror_report_err(local_err); error_free(local_err); ret = -EINVAL; goto fail; } dirname = qemu_opt_get(opts, "dir"); if (!dirname) { qerror_report(ERROR_CLASS_GENERIC_ERROR, "vvfat block driver requires " "a 'dir' option"); ret = -EINVAL; goto fail; } s->fat_type = qemu_opt_get_number(opts, "fat-type", 0); floppy = qemu_opt_get_bool(opts, "floppy", false); if (floppy) { /* 1.44MB or 2.88MB floppy. 2.88MB can be FAT12 (default) or FAT16. */ if (!s->fat_type) { s->fat_type = 12; secs = 36; s->sectors_per_cluster = 2; } else { secs = s->fat_type == 12 ? 18 : 36; s->sectors_per_cluster = 1; } s->first_sectors_number = 1; cyls = 80; heads = 2; } else { /* 32MB or 504MB disk*/ if (!s->fat_type) { s->fat_type = 16; } cyls = s->fat_type == 12 ? 64 : 1024; heads = 16; secs = 63; } switch (s->fat_type) { case 32: fprintf(stderr, "Big fat greek warning: FAT32 has not been tested. " "You are welcome to do so!\n"); break; case 16: case 12: break; default: qerror_report(ERROR_CLASS_GENERIC_ERROR, "Valid FAT types are only " "12, 16 and 32"); ret = -EINVAL; goto fail; } s->bs = bs; /* LATER TODO: if FAT32, adjust */ s->sectors_per_cluster=0x10; s->current_cluster=0xffffffff; s->first_sectors_number=0x40; /* read only is the default for safety */ bs->read_only = 1; s->qcow = s->write_target = NULL; s->qcow_filename = NULL; s->fat2 = NULL; s->downcase_short_names = 1; fprintf(stderr, "vvfat %s chs %d,%d,%d\n", dirname, cyls, heads, secs); s->sector_count = cyls * heads * secs - (s->first_sectors_number - 1); if (qemu_opt_get_bool(opts, "rw", false)) { if (enable_write_target(s)) { ret = -EIO; goto fail; } bs->read_only = 0; } bs->total_sectors = cyls * heads * secs; if (init_directories(s, dirname, heads, secs)) { ret = -EIO; goto fail; } s->sector_count = s->faked_sectors + s->sectors_per_cluster*s->cluster_count; if (s->first_sectors_number == 0x40) { init_mbr(s, cyls, heads, secs); } // assert(is_consistent(s)); qemu_co_mutex_init(&s->lock); /* Disable migration when vvfat is used rw */ if (s->qcow) { error_set(&s->migration_blocker, QERR_BLOCK_FORMAT_FEATURE_NOT_SUPPORTED, "vvfat (rw)", bs->device_name, "live migration"); migrate_add_blocker(s->migration_blocker); } ret = 0; fail: qemu_opts_del(opts); return ret; }