/* Since RBD is currently always opened R/W via the API, * we just need to check if we are using a snapshot or not, in * order to determine if we will allow it to be R/W */ static int qemu_rbd_reopen_prepare(BDRVReopenState *state, BlockReopenQueue *queue, Error **errp) { BDRVRBDState *s = state->bs->opaque; int ret = 0; if (s->snap && state->flags & BDRV_O_RDWR) { error_setg(errp, "Cannot change node '%s' to r/w when using RBD snapshot", bdrv_get_device_or_node_name(state->bs)); ret = -EINVAL; } return ret; }
static int check_constraints_on_bitmap(BlockDriverState *bs, const char *name, uint32_t granularity, Error **errp) { BDRVQcow2State *s = bs->opaque; int granularity_bits = ctz32(granularity); int64_t len = bdrv_getlength(bs); assert(granularity > 0); assert((granularity & (granularity - 1)) == 0); if (len < 0) { error_setg_errno(errp, -len, "Failed to get size of '%s'", bdrv_get_device_or_node_name(bs)); return len; } if (granularity_bits > BME_MAX_GRANULARITY_BITS) { error_setg(errp, "Granularity exceeds maximum (%llu bytes)", 1ULL << BME_MAX_GRANULARITY_BITS); return -EINVAL; } if (granularity_bits < BME_MIN_GRANULARITY_BITS) { error_setg(errp, "Granularity is under minimum (%llu bytes)", 1ULL << BME_MIN_GRANULARITY_BITS); return -EINVAL; } if ((len > (uint64_t)BME_MAX_PHYS_SIZE << granularity_bits) || (len > (uint64_t)BME_MAX_TABLE_SIZE * s->cluster_size << granularity_bits)) { error_setg(errp, "Too much space will be occupied by the bitmap. " "Use larger granularity"); return -EINVAL; } if (strlen(name) > BME_MAX_NAME_SIZE) { error_setg(errp, "Name length exceeds maximum (%u characters)", BME_MAX_NAME_SIZE); return -EINVAL; } return 0; }
static int vpc_open(BlockDriverState *bs, QDict *options, int flags, Error **errp) { BDRVVPCState *s = bs->opaque; int i; VHDFooter *footer; VHDDynDiskHeader *dyndisk_header; uint8_t buf[HEADER_SIZE]; uint32_t checksum; uint64_t computed_size; uint64_t pagetable_size; int disk_type = VHD_DYNAMIC; int ret; ret = bdrv_pread(bs->file->bs, 0, s->footer_buf, HEADER_SIZE); if (ret < 0) { goto fail; } footer = (VHDFooter *) s->footer_buf; if (strncmp(footer->creator, "conectix", 8)) { int64_t offset = bdrv_getlength(bs->file->bs); if (offset < 0) { ret = offset; goto fail; } else if (offset < HEADER_SIZE) { ret = -EINVAL; goto fail; } /* If a fixed disk, the footer is found only at the end of the file */ ret = bdrv_pread(bs->file->bs, offset-HEADER_SIZE, s->footer_buf, HEADER_SIZE); if (ret < 0) { goto fail; } if (strncmp(footer->creator, "conectix", 8)) { error_setg(errp, "invalid VPC image"); ret = -EINVAL; goto fail; } disk_type = VHD_FIXED; } checksum = be32_to_cpu(footer->checksum); footer->checksum = 0; if (vpc_checksum(s->footer_buf, HEADER_SIZE) != checksum) fprintf(stderr, "block-vpc: The header checksum of '%s' is " "incorrect.\n", bs->filename); /* Write 'checksum' back to footer, or else will leave it with zero. */ footer->checksum = cpu_to_be32(checksum); // The visible size of a image in Virtual PC depends on the geometry // rather than on the size stored in the footer (the size in the footer // is too large usually) bs->total_sectors = (int64_t) be16_to_cpu(footer->cyls) * footer->heads * footer->secs_per_cyl; /* Images that have exactly the maximum geometry are probably bigger and * would be truncated if we adhered to the geometry for them. Rely on * footer->current_size for them. */ if (bs->total_sectors == VHD_MAX_GEOMETRY) { bs->total_sectors = be64_to_cpu(footer->current_size) / BDRV_SECTOR_SIZE; } /* Allow a maximum disk size of approximately 2 TB */ if (bs->total_sectors >= VHD_MAX_SECTORS) { ret = -EFBIG; goto fail; } if (disk_type == VHD_DYNAMIC) { ret = bdrv_pread(bs->file->bs, be64_to_cpu(footer->data_offset), buf, HEADER_SIZE); if (ret < 0) { goto fail; } dyndisk_header = (VHDDynDiskHeader *) buf; if (strncmp(dyndisk_header->magic, "cxsparse", 8)) { ret = -EINVAL; goto fail; } s->block_size = be32_to_cpu(dyndisk_header->block_size); if (!is_power_of_2(s->block_size) || s->block_size < BDRV_SECTOR_SIZE) { error_setg(errp, "Invalid block size %" PRIu32, s->block_size); ret = -EINVAL; goto fail; } s->bitmap_size = ((s->block_size / (8 * 512)) + 511) & ~511; s->max_table_entries = be32_to_cpu(dyndisk_header->max_table_entries); if ((bs->total_sectors * 512) / s->block_size > 0xffffffffU) { ret = -EINVAL; goto fail; } if (s->max_table_entries > (VHD_MAX_SECTORS * 512) / s->block_size) { ret = -EINVAL; goto fail; } computed_size = (uint64_t) s->max_table_entries * s->block_size; if (computed_size < bs->total_sectors * 512) { ret = -EINVAL; goto fail; } if (s->max_table_entries > SIZE_MAX / 4 || s->max_table_entries > (int) INT_MAX / 4) { error_setg(errp, "Max Table Entries too large (%" PRId32 ")", s->max_table_entries); ret = -EINVAL; goto fail; } pagetable_size = (uint64_t) s->max_table_entries * 4; s->pagetable = qemu_try_blockalign(bs->file->bs, pagetable_size); if (s->pagetable == NULL) { ret = -ENOMEM; goto fail; } s->bat_offset = be64_to_cpu(dyndisk_header->table_offset); ret = bdrv_pread(bs->file->bs, s->bat_offset, s->pagetable, pagetable_size); if (ret < 0) { goto fail; } s->free_data_block_offset = ROUND_UP(s->bat_offset + pagetable_size, 512); for (i = 0; i < s->max_table_entries; i++) { be32_to_cpus(&s->pagetable[i]); if (s->pagetable[i] != 0xFFFFFFFF) { int64_t next = (512 * (int64_t) s->pagetable[i]) + s->bitmap_size + s->block_size; if (next > s->free_data_block_offset) { s->free_data_block_offset = next; } } } if (s->free_data_block_offset > bdrv_getlength(bs->file->bs)) { error_setg(errp, "block-vpc: free_data_block_offset points after " "the end of file. The image has been truncated."); ret = -EINVAL; goto fail; } s->last_bitmap_offset = (int64_t) -1; #ifdef CACHE s->pageentry_u8 = g_malloc(512); s->pageentry_u32 = s->pageentry_u8; s->pageentry_u16 = s->pageentry_u8; s->last_pagetable = -1; #endif } qemu_co_mutex_init(&s->lock); /* Disable migration when VHD images are used */ error_setg(&s->migration_blocker, "The vpc format used by node '%s' " "does not support live migration", bdrv_get_device_or_node_name(bs)); migrate_add_blocker(s->migration_blocker); return 0; fail: qemu_vfree(s->pagetable); #ifdef CACHE g_free(s->pageentry_u8); #endif return ret; }