19aebd98aSStefan Weil /* 29aebd98aSStefan Weil * Block driver for the Virtual Disk Image (VDI) format 39aebd98aSStefan Weil * 49aebd98aSStefan Weil * Copyright (c) 2009 Stefan Weil 59aebd98aSStefan Weil * 69aebd98aSStefan Weil * This program is free software: you can redistribute it and/or modify 79aebd98aSStefan Weil * it under the terms of the GNU General Public License as published by 89aebd98aSStefan Weil * the Free Software Foundation, either version 2 of the License, or 99aebd98aSStefan Weil * (at your option) version 3 or any later version. 109aebd98aSStefan Weil * 119aebd98aSStefan Weil * This program is distributed in the hope that it will be useful, 129aebd98aSStefan Weil * but WITHOUT ANY WARRANTY; without even the implied warranty of 139aebd98aSStefan Weil * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 149aebd98aSStefan Weil * GNU General Public License for more details. 159aebd98aSStefan Weil * 169aebd98aSStefan Weil * You should have received a copy of the GNU General Public License 179aebd98aSStefan Weil * along with this program. If not, see <http://www.gnu.org/licenses/>. 189aebd98aSStefan Weil * 199aebd98aSStefan Weil * Reference: 209aebd98aSStefan Weil * http://forums.virtualbox.org/viewtopic.php?t=8046 219aebd98aSStefan Weil * 229aebd98aSStefan Weil * This driver supports create / read / write operations on VDI images. 239aebd98aSStefan Weil * 249aebd98aSStefan Weil * Todo (see also TODO in code): 259aebd98aSStefan Weil * 269aebd98aSStefan Weil * Some features like snapshots are still missing. 279aebd98aSStefan Weil * 289aebd98aSStefan Weil * Deallocation of zero-filled blocks and shrinking images are missing, too 299aebd98aSStefan Weil * (might be added to common block layer). 309aebd98aSStefan Weil * 319aebd98aSStefan Weil * Allocation of blocks could be optimized (less writes to block map and 329aebd98aSStefan Weil * header). 339aebd98aSStefan Weil * 349aebd98aSStefan Weil * Read and write of adjacents blocks could be done in one operation 359aebd98aSStefan Weil * (current code uses one operation per block (1 MiB). 369aebd98aSStefan Weil * 379aebd98aSStefan Weil * The code is not thread safe (missing locks for changes in header and 389aebd98aSStefan Weil * block table, no problem with current QEMU). 399aebd98aSStefan Weil * 409aebd98aSStefan Weil * Hints: 419aebd98aSStefan Weil * 429aebd98aSStefan Weil * Blocks (VDI documentation) correspond to clusters (QEMU). 439aebd98aSStefan Weil * QEMU's backing files could be implemented using VDI snapshot files (TODO). 449aebd98aSStefan Weil * VDI snapshot files may also contain the complete machine state. 459aebd98aSStefan Weil * Maybe this machine state can be converted to QEMU PC machine snapshot data. 469aebd98aSStefan Weil * 479aebd98aSStefan Weil * The driver keeps a block cache (little endian entries) in memory. 489aebd98aSStefan Weil * For the standard block size (1 MiB), a 1 TiB disk will use 4 MiB RAM, 499aebd98aSStefan Weil * so this seems to be reasonable. 509aebd98aSStefan Weil */ 519aebd98aSStefan Weil 529aebd98aSStefan Weil #include "qemu-common.h" 539aebd98aSStefan Weil #include "block_int.h" 549aebd98aSStefan Weil #include "module.h" 55fc9d106cSKevin Wolf #include "migration.h" 569aebd98aSStefan Weil 57ee682d27SStefan Weil #if defined(CONFIG_UUID) 589aebd98aSStefan Weil #include <uuid/uuid.h> 599aebd98aSStefan Weil #else 609aebd98aSStefan Weil /* TODO: move uuid emulation to some central place in QEMU. */ 619aebd98aSStefan Weil #include "sysemu.h" /* UUID_FMT */ 629aebd98aSStefan Weil typedef unsigned char uuid_t[16]; 639aebd98aSStefan Weil void uuid_generate(uuid_t out); 649aebd98aSStefan Weil int uuid_is_null(const uuid_t uu); 659aebd98aSStefan Weil void uuid_unparse(const uuid_t uu, char *out); 669aebd98aSStefan Weil #endif 679aebd98aSStefan Weil 689aebd98aSStefan Weil /* Code configuration options. */ 699aebd98aSStefan Weil 709aebd98aSStefan Weil /* Enable debug messages. */ 719aebd98aSStefan Weil //~ #define CONFIG_VDI_DEBUG 729aebd98aSStefan Weil 739aebd98aSStefan Weil /* Support write operations on VDI images. */ 749aebd98aSStefan Weil #define CONFIG_VDI_WRITE 759aebd98aSStefan Weil 769aebd98aSStefan Weil /* Support non-standard block (cluster) size. This is untested. 779aebd98aSStefan Weil * Maybe it will be needed for very large images. 789aebd98aSStefan Weil */ 799aebd98aSStefan Weil //~ #define CONFIG_VDI_BLOCK_SIZE 809aebd98aSStefan Weil 819aebd98aSStefan Weil /* Support static (fixed, pre-allocated) images. */ 829aebd98aSStefan Weil #define CONFIG_VDI_STATIC_IMAGE 839aebd98aSStefan Weil 849aebd98aSStefan Weil /* Command line option for static images. */ 859aebd98aSStefan Weil #define BLOCK_OPT_STATIC "static" 869aebd98aSStefan Weil 879aebd98aSStefan Weil #define KiB 1024 889aebd98aSStefan Weil #define MiB (KiB * KiB) 899aebd98aSStefan Weil 909aebd98aSStefan Weil #define SECTOR_SIZE 512 9199cce9faSKevin Wolf #define DEFAULT_CLUSTER_SIZE (1 * MiB) 929aebd98aSStefan Weil 939aebd98aSStefan Weil #if defined(CONFIG_VDI_DEBUG) 949aebd98aSStefan Weil #define logout(fmt, ...) \ 959aebd98aSStefan Weil fprintf(stderr, "vdi\t%-24s" fmt, __func__, ##__VA_ARGS__) 969aebd98aSStefan Weil #else 979aebd98aSStefan Weil #define logout(fmt, ...) ((void)0) 989aebd98aSStefan Weil #endif 999aebd98aSStefan Weil 1009aebd98aSStefan Weil /* Image signature. */ 1019aebd98aSStefan Weil #define VDI_SIGNATURE 0xbeda107f 1029aebd98aSStefan Weil 1039aebd98aSStefan Weil /* Image version. */ 1049aebd98aSStefan Weil #define VDI_VERSION_1_1 0x00010001 1059aebd98aSStefan Weil 1069aebd98aSStefan Weil /* Image type. */ 1079aebd98aSStefan Weil #define VDI_TYPE_DYNAMIC 1 1089aebd98aSStefan Weil #define VDI_TYPE_STATIC 2 1099aebd98aSStefan Weil 1109aebd98aSStefan Weil /* Innotek / SUN images use these strings in header.text: 1119aebd98aSStefan Weil * "<<< innotek VirtualBox Disk Image >>>\n" 1129aebd98aSStefan Weil * "<<< Sun xVM VirtualBox Disk Image >>>\n" 1139aebd98aSStefan Weil * "<<< Sun VirtualBox Disk Image >>>\n" 1149aebd98aSStefan Weil * The value does not matter, so QEMU created images use a different text. 1159aebd98aSStefan Weil */ 1169aebd98aSStefan Weil #define VDI_TEXT "<<< QEMU VM Virtual Disk Image >>>\n" 1179aebd98aSStefan Weil 118c794b4e0SEric Sunshine /* A never-allocated block; semantically arbitrary content. */ 119c794b4e0SEric Sunshine #define VDI_UNALLOCATED 0xffffffffU 120c794b4e0SEric Sunshine 121c794b4e0SEric Sunshine /* A discarded (no longer allocated) block; semantically zero-filled. */ 122c794b4e0SEric Sunshine #define VDI_DISCARDED 0xfffffffeU 123c794b4e0SEric Sunshine 124c794b4e0SEric Sunshine #define VDI_IS_ALLOCATED(X) ((X) < VDI_DISCARDED) 1259aebd98aSStefan Weil 126ee682d27SStefan Weil #if !defined(CONFIG_UUID) 1279aebd98aSStefan Weil void uuid_generate(uuid_t out) 1289aebd98aSStefan Weil { 1294f3669eaSStefan Weil memset(out, 0, sizeof(uuid_t)); 1309aebd98aSStefan Weil } 1319aebd98aSStefan Weil 1329aebd98aSStefan Weil int uuid_is_null(const uuid_t uu) 1339aebd98aSStefan Weil { 1349aebd98aSStefan Weil uuid_t null_uuid = { 0 }; 1354f3669eaSStefan Weil return memcmp(uu, null_uuid, sizeof(uuid_t)) == 0; 1369aebd98aSStefan Weil } 1379aebd98aSStefan Weil 1389aebd98aSStefan Weil void uuid_unparse(const uuid_t uu, char *out) 1399aebd98aSStefan Weil { 1409aebd98aSStefan Weil snprintf(out, 37, UUID_FMT, 1419aebd98aSStefan Weil uu[0], uu[1], uu[2], uu[3], uu[4], uu[5], uu[6], uu[7], 1429aebd98aSStefan Weil uu[8], uu[9], uu[10], uu[11], uu[12], uu[13], uu[14], uu[15]); 1439aebd98aSStefan Weil } 1449aebd98aSStefan Weil #endif 1459aebd98aSStefan Weil 1469aebd98aSStefan Weil typedef struct { 1479aebd98aSStefan Weil BlockDriverAIOCB common; 1489aebd98aSStefan Weil int64_t sector_num; 1499aebd98aSStefan Weil QEMUIOVector *qiov; 1509aebd98aSStefan Weil uint8_t *buf; 1519aebd98aSStefan Weil /* Total number of sectors. */ 1529aebd98aSStefan Weil int nb_sectors; 1539aebd98aSStefan Weil /* Number of sectors for current AIO. */ 1549aebd98aSStefan Weil int n_sectors; 1559aebd98aSStefan Weil /* New allocated block map entry. */ 1569aebd98aSStefan Weil uint32_t bmap_first; 1579aebd98aSStefan Weil uint32_t bmap_last; 1589aebd98aSStefan Weil /* Buffer for new allocated block. */ 1599aebd98aSStefan Weil void *block_buffer; 1609aebd98aSStefan Weil void *orig_buf; 161e67a64a8SKevin Wolf bool is_write; 1629aebd98aSStefan Weil int header_modified; 1639aebd98aSStefan Weil BlockDriverAIOCB *hd_aiocb; 1649aebd98aSStefan Weil struct iovec hd_iov; 1659aebd98aSStefan Weil QEMUIOVector hd_qiov; 1669aebd98aSStefan Weil QEMUBH *bh; 1679aebd98aSStefan Weil } VdiAIOCB; 1689aebd98aSStefan Weil 1699aebd98aSStefan Weil typedef struct { 1709aebd98aSStefan Weil char text[0x40]; 1719aebd98aSStefan Weil uint32_t signature; 1729aebd98aSStefan Weil uint32_t version; 1739aebd98aSStefan Weil uint32_t header_size; 1749aebd98aSStefan Weil uint32_t image_type; 1759aebd98aSStefan Weil uint32_t image_flags; 1769aebd98aSStefan Weil char description[256]; 1779aebd98aSStefan Weil uint32_t offset_bmap; 1789aebd98aSStefan Weil uint32_t offset_data; 1799aebd98aSStefan Weil uint32_t cylinders; /* disk geometry, unused here */ 1809aebd98aSStefan Weil uint32_t heads; /* disk geometry, unused here */ 1819aebd98aSStefan Weil uint32_t sectors; /* disk geometry, unused here */ 1829aebd98aSStefan Weil uint32_t sector_size; 1839aebd98aSStefan Weil uint32_t unused1; 1849aebd98aSStefan Weil uint64_t disk_size; 1859aebd98aSStefan Weil uint32_t block_size; 1869aebd98aSStefan Weil uint32_t block_extra; /* unused here */ 1879aebd98aSStefan Weil uint32_t blocks_in_image; 1889aebd98aSStefan Weil uint32_t blocks_allocated; 1899aebd98aSStefan Weil uuid_t uuid_image; 1909aebd98aSStefan Weil uuid_t uuid_last_snap; 1919aebd98aSStefan Weil uuid_t uuid_link; 1929aebd98aSStefan Weil uuid_t uuid_parent; 1939aebd98aSStefan Weil uint64_t unused2[7]; 1949aebd98aSStefan Weil } VdiHeader; 1959aebd98aSStefan Weil 1969aebd98aSStefan Weil typedef struct { 1979aebd98aSStefan Weil /* The block map entries are little endian (even in memory). */ 1989aebd98aSStefan Weil uint32_t *bmap; 1999aebd98aSStefan Weil /* Size of block (bytes). */ 2009aebd98aSStefan Weil uint32_t block_size; 2019aebd98aSStefan Weil /* Size of block (sectors). */ 2029aebd98aSStefan Weil uint32_t block_sectors; 2039aebd98aSStefan Weil /* First sector of block map. */ 2049aebd98aSStefan Weil uint32_t bmap_sector; 2054ff9786cSStefan Weil /* VDI header (converted to host endianness). */ 2069aebd98aSStefan Weil VdiHeader header; 207fc9d106cSKevin Wolf 208fc9d106cSKevin Wolf Error *migration_blocker; 2099aebd98aSStefan Weil } BDRVVdiState; 2109aebd98aSStefan Weil 2119aebd98aSStefan Weil /* Change UUID from little endian (IPRT = VirtualBox format) to big endian 2129aebd98aSStefan Weil * format (network byte order, standard, see RFC 4122) and vice versa. 2139aebd98aSStefan Weil */ 2149aebd98aSStefan Weil static void uuid_convert(uuid_t uuid) 2159aebd98aSStefan Weil { 2169aebd98aSStefan Weil bswap32s((uint32_t *)&uuid[0]); 2179aebd98aSStefan Weil bswap16s((uint16_t *)&uuid[4]); 2189aebd98aSStefan Weil bswap16s((uint16_t *)&uuid[6]); 2199aebd98aSStefan Weil } 2209aebd98aSStefan Weil 2219aebd98aSStefan Weil static void vdi_header_to_cpu(VdiHeader *header) 2229aebd98aSStefan Weil { 2239aebd98aSStefan Weil le32_to_cpus(&header->signature); 2249aebd98aSStefan Weil le32_to_cpus(&header->version); 2259aebd98aSStefan Weil le32_to_cpus(&header->header_size); 2269aebd98aSStefan Weil le32_to_cpus(&header->image_type); 2279aebd98aSStefan Weil le32_to_cpus(&header->image_flags); 2289aebd98aSStefan Weil le32_to_cpus(&header->offset_bmap); 2299aebd98aSStefan Weil le32_to_cpus(&header->offset_data); 2309aebd98aSStefan Weil le32_to_cpus(&header->cylinders); 2319aebd98aSStefan Weil le32_to_cpus(&header->heads); 2329aebd98aSStefan Weil le32_to_cpus(&header->sectors); 2339aebd98aSStefan Weil le32_to_cpus(&header->sector_size); 2349aebd98aSStefan Weil le64_to_cpus(&header->disk_size); 2359aebd98aSStefan Weil le32_to_cpus(&header->block_size); 2369aebd98aSStefan Weil le32_to_cpus(&header->block_extra); 2379aebd98aSStefan Weil le32_to_cpus(&header->blocks_in_image); 2389aebd98aSStefan Weil le32_to_cpus(&header->blocks_allocated); 2399aebd98aSStefan Weil uuid_convert(header->uuid_image); 2409aebd98aSStefan Weil uuid_convert(header->uuid_last_snap); 2419aebd98aSStefan Weil uuid_convert(header->uuid_link); 2429aebd98aSStefan Weil uuid_convert(header->uuid_parent); 2439aebd98aSStefan Weil } 2449aebd98aSStefan Weil 2459aebd98aSStefan Weil static void vdi_header_to_le(VdiHeader *header) 2469aebd98aSStefan Weil { 2479aebd98aSStefan Weil cpu_to_le32s(&header->signature); 2489aebd98aSStefan Weil cpu_to_le32s(&header->version); 2499aebd98aSStefan Weil cpu_to_le32s(&header->header_size); 2509aebd98aSStefan Weil cpu_to_le32s(&header->image_type); 2519aebd98aSStefan Weil cpu_to_le32s(&header->image_flags); 2529aebd98aSStefan Weil cpu_to_le32s(&header->offset_bmap); 2539aebd98aSStefan Weil cpu_to_le32s(&header->offset_data); 2549aebd98aSStefan Weil cpu_to_le32s(&header->cylinders); 2559aebd98aSStefan Weil cpu_to_le32s(&header->heads); 2569aebd98aSStefan Weil cpu_to_le32s(&header->sectors); 2579aebd98aSStefan Weil cpu_to_le32s(&header->sector_size); 2589aebd98aSStefan Weil cpu_to_le64s(&header->disk_size); 2599aebd98aSStefan Weil cpu_to_le32s(&header->block_size); 2609aebd98aSStefan Weil cpu_to_le32s(&header->block_extra); 2619aebd98aSStefan Weil cpu_to_le32s(&header->blocks_in_image); 2629aebd98aSStefan Weil cpu_to_le32s(&header->blocks_allocated); 2639aebd98aSStefan Weil cpu_to_le32s(&header->blocks_allocated); 2649aebd98aSStefan Weil uuid_convert(header->uuid_image); 2659aebd98aSStefan Weil uuid_convert(header->uuid_last_snap); 2669aebd98aSStefan Weil uuid_convert(header->uuid_link); 2679aebd98aSStefan Weil uuid_convert(header->uuid_parent); 2689aebd98aSStefan Weil } 2699aebd98aSStefan Weil 2709aebd98aSStefan Weil #if defined(CONFIG_VDI_DEBUG) 2719aebd98aSStefan Weil static void vdi_header_print(VdiHeader *header) 2729aebd98aSStefan Weil { 2739aebd98aSStefan Weil char uuid[37]; 2749aebd98aSStefan Weil logout("text %s", header->text); 2759aebd98aSStefan Weil logout("signature 0x%04x\n", header->signature); 2769aebd98aSStefan Weil logout("header size 0x%04x\n", header->header_size); 2779aebd98aSStefan Weil logout("image type 0x%04x\n", header->image_type); 2789aebd98aSStefan Weil logout("image flags 0x%04x\n", header->image_flags); 2799aebd98aSStefan Weil logout("description %s\n", header->description); 2809aebd98aSStefan Weil logout("offset bmap 0x%04x\n", header->offset_bmap); 2819aebd98aSStefan Weil logout("offset data 0x%04x\n", header->offset_data); 2829aebd98aSStefan Weil logout("cylinders 0x%04x\n", header->cylinders); 2839aebd98aSStefan Weil logout("heads 0x%04x\n", header->heads); 2849aebd98aSStefan Weil logout("sectors 0x%04x\n", header->sectors); 2859aebd98aSStefan Weil logout("sector size 0x%04x\n", header->sector_size); 2869aebd98aSStefan Weil logout("image size 0x%" PRIx64 " B (%" PRIu64 " MiB)\n", 2879aebd98aSStefan Weil header->disk_size, header->disk_size / MiB); 2889aebd98aSStefan Weil logout("block size 0x%04x\n", header->block_size); 2899aebd98aSStefan Weil logout("block extra 0x%04x\n", header->block_extra); 2909aebd98aSStefan Weil logout("blocks tot. 0x%04x\n", header->blocks_in_image); 2919aebd98aSStefan Weil logout("blocks all. 0x%04x\n", header->blocks_allocated); 2929aebd98aSStefan Weil uuid_unparse(header->uuid_image, uuid); 2939aebd98aSStefan Weil logout("uuid image %s\n", uuid); 2949aebd98aSStefan Weil uuid_unparse(header->uuid_last_snap, uuid); 2959aebd98aSStefan Weil logout("uuid snap %s\n", uuid); 2969aebd98aSStefan Weil uuid_unparse(header->uuid_link, uuid); 2979aebd98aSStefan Weil logout("uuid link %s\n", uuid); 2989aebd98aSStefan Weil uuid_unparse(header->uuid_parent, uuid); 2999aebd98aSStefan Weil logout("uuid parent %s\n", uuid); 3009aebd98aSStefan Weil } 3019aebd98aSStefan Weil #endif 3029aebd98aSStefan Weil 3039ac228e0SKevin Wolf static int vdi_check(BlockDriverState *bs, BdrvCheckResult *res) 3049aebd98aSStefan Weil { 3059aebd98aSStefan Weil /* TODO: additional checks possible. */ 3069aebd98aSStefan Weil BDRVVdiState *s = (BDRVVdiState *)bs->opaque; 3079aebd98aSStefan Weil uint32_t blocks_allocated = 0; 3089aebd98aSStefan Weil uint32_t block; 3099aebd98aSStefan Weil uint32_t *bmap; 3109aebd98aSStefan Weil logout("\n"); 3119aebd98aSStefan Weil 3127267c094SAnthony Liguori bmap = g_malloc(s->header.blocks_in_image * sizeof(uint32_t)); 3139aebd98aSStefan Weil memset(bmap, 0xff, s->header.blocks_in_image * sizeof(uint32_t)); 3149aebd98aSStefan Weil 3159aebd98aSStefan Weil /* Check block map and value of blocks_allocated. */ 3169aebd98aSStefan Weil for (block = 0; block < s->header.blocks_in_image; block++) { 3179aebd98aSStefan Weil uint32_t bmap_entry = le32_to_cpu(s->bmap[block]); 318c794b4e0SEric Sunshine if (VDI_IS_ALLOCATED(bmap_entry)) { 3199aebd98aSStefan Weil if (bmap_entry < s->header.blocks_in_image) { 3209aebd98aSStefan Weil blocks_allocated++; 321c794b4e0SEric Sunshine if (!VDI_IS_ALLOCATED(bmap[bmap_entry])) { 3229aebd98aSStefan Weil bmap[bmap_entry] = bmap_entry; 3239aebd98aSStefan Weil } else { 3249aebd98aSStefan Weil fprintf(stderr, "ERROR: block index %" PRIu32 3259aebd98aSStefan Weil " also used by %" PRIu32 "\n", bmap[bmap_entry], bmap_entry); 3269ac228e0SKevin Wolf res->corruptions++; 3279aebd98aSStefan Weil } 3289aebd98aSStefan Weil } else { 3299aebd98aSStefan Weil fprintf(stderr, "ERROR: block index %" PRIu32 3309aebd98aSStefan Weil " too large, is %" PRIu32 "\n", block, bmap_entry); 3319ac228e0SKevin Wolf res->corruptions++; 3329aebd98aSStefan Weil } 3339aebd98aSStefan Weil } 3349aebd98aSStefan Weil } 3359aebd98aSStefan Weil if (blocks_allocated != s->header.blocks_allocated) { 3369aebd98aSStefan Weil fprintf(stderr, "ERROR: allocated blocks mismatch, is %" PRIu32 3379aebd98aSStefan Weil ", should be %" PRIu32 "\n", 3389aebd98aSStefan Weil blocks_allocated, s->header.blocks_allocated); 3399ac228e0SKevin Wolf res->corruptions++; 3409aebd98aSStefan Weil } 3419aebd98aSStefan Weil 3427267c094SAnthony Liguori g_free(bmap); 3439aebd98aSStefan Weil 3449ac228e0SKevin Wolf return 0; 3459aebd98aSStefan Weil } 3469aebd98aSStefan Weil 3479aebd98aSStefan Weil static int vdi_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) 3489aebd98aSStefan Weil { 3499aebd98aSStefan Weil /* TODO: vdi_get_info would be needed for machine snapshots. 3509aebd98aSStefan Weil vm_state_offset is still missing. */ 3519aebd98aSStefan Weil BDRVVdiState *s = (BDRVVdiState *)bs->opaque; 3529aebd98aSStefan Weil logout("\n"); 3539aebd98aSStefan Weil bdi->cluster_size = s->block_size; 3549aebd98aSStefan Weil bdi->vm_state_offset = 0; 3559aebd98aSStefan Weil return 0; 3569aebd98aSStefan Weil } 3579aebd98aSStefan Weil 3589aebd98aSStefan Weil static int vdi_make_empty(BlockDriverState *bs) 3599aebd98aSStefan Weil { 3609aebd98aSStefan Weil /* TODO: missing code. */ 3619aebd98aSStefan Weil logout("\n"); 3629aebd98aSStefan Weil /* The return value for missing code must be 0, see block.c. */ 3639aebd98aSStefan Weil return 0; 3649aebd98aSStefan Weil } 3659aebd98aSStefan Weil 3669aebd98aSStefan Weil static int vdi_probe(const uint8_t *buf, int buf_size, const char *filename) 3679aebd98aSStefan Weil { 3689aebd98aSStefan Weil const VdiHeader *header = (const VdiHeader *)buf; 3699aebd98aSStefan Weil int result = 0; 3709aebd98aSStefan Weil 3719aebd98aSStefan Weil logout("\n"); 3729aebd98aSStefan Weil 3739aebd98aSStefan Weil if (buf_size < sizeof(*header)) { 3749aebd98aSStefan Weil /* Header too small, no VDI. */ 3759aebd98aSStefan Weil } else if (le32_to_cpu(header->signature) == VDI_SIGNATURE) { 3769aebd98aSStefan Weil result = 100; 3779aebd98aSStefan Weil } 3789aebd98aSStefan Weil 3799aebd98aSStefan Weil if (result == 0) { 3809aebd98aSStefan Weil logout("no vdi image\n"); 3819aebd98aSStefan Weil } else { 3829aebd98aSStefan Weil logout("%s", header->text); 3839aebd98aSStefan Weil } 3849aebd98aSStefan Weil 3859aebd98aSStefan Weil return result; 3869aebd98aSStefan Weil } 3879aebd98aSStefan Weil 38866f82ceeSKevin Wolf static int vdi_open(BlockDriverState *bs, int flags) 3899aebd98aSStefan Weil { 3909aebd98aSStefan Weil BDRVVdiState *s = bs->opaque; 3919aebd98aSStefan Weil VdiHeader header; 3929aebd98aSStefan Weil size_t bmap_size; 3939aebd98aSStefan Weil 3949aebd98aSStefan Weil logout("\n"); 3959aebd98aSStefan Weil 39666f82ceeSKevin Wolf if (bdrv_read(bs->file, 0, (uint8_t *)&header, 1) < 0) { 3979aebd98aSStefan Weil goto fail; 3989aebd98aSStefan Weil } 3999aebd98aSStefan Weil 4009aebd98aSStefan Weil vdi_header_to_cpu(&header); 4019aebd98aSStefan Weil #if defined(CONFIG_VDI_DEBUG) 4029aebd98aSStefan Weil vdi_header_print(&header); 4039aebd98aSStefan Weil #endif 4049aebd98aSStefan Weil 405f21dc3a4SStefan Weil if (header.disk_size % SECTOR_SIZE != 0) { 406f21dc3a4SStefan Weil /* 'VBoxManage convertfromraw' can create images with odd disk sizes. 407f21dc3a4SStefan Weil We accept them but round the disk size to the next multiple of 408f21dc3a4SStefan Weil SECTOR_SIZE. */ 409f21dc3a4SStefan Weil logout("odd disk size %" PRIu64 " B, round up\n", header.disk_size); 410f21dc3a4SStefan Weil header.disk_size += SECTOR_SIZE - 1; 411f21dc3a4SStefan Weil header.disk_size &= ~(SECTOR_SIZE - 1); 412f21dc3a4SStefan Weil } 413f21dc3a4SStefan Weil 4149aebd98aSStefan Weil if (header.version != VDI_VERSION_1_1) { 4159aebd98aSStefan Weil logout("unsupported version %u.%u\n", 4169aebd98aSStefan Weil header.version >> 16, header.version & 0xffff); 4179aebd98aSStefan Weil goto fail; 4189aebd98aSStefan Weil } else if (header.offset_bmap % SECTOR_SIZE != 0) { 4199aebd98aSStefan Weil /* We only support block maps which start on a sector boundary. */ 4209aebd98aSStefan Weil logout("unsupported block map offset 0x%x B\n", header.offset_bmap); 4219aebd98aSStefan Weil goto fail; 4229aebd98aSStefan Weil } else if (header.offset_data % SECTOR_SIZE != 0) { 4239aebd98aSStefan Weil /* We only support data blocks which start on a sector boundary. */ 4249aebd98aSStefan Weil logout("unsupported data offset 0x%x B\n", header.offset_data); 4259aebd98aSStefan Weil goto fail; 4269aebd98aSStefan Weil } else if (header.sector_size != SECTOR_SIZE) { 4279aebd98aSStefan Weil logout("unsupported sector size %u B\n", header.sector_size); 4289aebd98aSStefan Weil goto fail; 4299aebd98aSStefan Weil } else if (header.block_size != 1 * MiB) { 4309aebd98aSStefan Weil logout("unsupported block size %u B\n", header.block_size); 4319aebd98aSStefan Weil goto fail; 432f21dc3a4SStefan Weil } else if (header.disk_size > 433f21dc3a4SStefan Weil (uint64_t)header.blocks_in_image * header.block_size) { 434f21dc3a4SStefan Weil logout("unsupported disk size %" PRIu64 " B\n", header.disk_size); 4359aebd98aSStefan Weil goto fail; 4369aebd98aSStefan Weil } else if (!uuid_is_null(header.uuid_link)) { 4379aebd98aSStefan Weil logout("link uuid != 0, unsupported\n"); 4389aebd98aSStefan Weil goto fail; 4399aebd98aSStefan Weil } else if (!uuid_is_null(header.uuid_parent)) { 4409aebd98aSStefan Weil logout("parent uuid != 0, unsupported\n"); 4419aebd98aSStefan Weil goto fail; 4429aebd98aSStefan Weil } 4439aebd98aSStefan Weil 4449aebd98aSStefan Weil bs->total_sectors = header.disk_size / SECTOR_SIZE; 4459aebd98aSStefan Weil 4469aebd98aSStefan Weil s->block_size = header.block_size; 4479aebd98aSStefan Weil s->block_sectors = header.block_size / SECTOR_SIZE; 4489aebd98aSStefan Weil s->bmap_sector = header.offset_bmap / SECTOR_SIZE; 4499aebd98aSStefan Weil s->header = header; 4509aebd98aSStefan Weil 4519aebd98aSStefan Weil bmap_size = header.blocks_in_image * sizeof(uint32_t); 4526eea90ebSStefan Weil bmap_size = (bmap_size + SECTOR_SIZE - 1) / SECTOR_SIZE; 453b76b6e95SStefan Weil if (bmap_size > 0) { 4547267c094SAnthony Liguori s->bmap = g_malloc(bmap_size * SECTOR_SIZE); 455b76b6e95SStefan Weil } 45666f82ceeSKevin Wolf if (bdrv_read(bs->file, s->bmap_sector, (uint8_t *)s->bmap, bmap_size) < 0) { 4579aebd98aSStefan Weil goto fail_free_bmap; 4589aebd98aSStefan Weil } 4599aebd98aSStefan Weil 460fc9d106cSKevin Wolf /* Disable migration when vdi images are used */ 461fc9d106cSKevin Wolf error_set(&s->migration_blocker, 462fc9d106cSKevin Wolf QERR_BLOCK_FORMAT_FEATURE_NOT_SUPPORTED, 463fc9d106cSKevin Wolf "vdi", bs->device_name, "live migration"); 464fc9d106cSKevin Wolf migrate_add_blocker(s->migration_blocker); 465fc9d106cSKevin Wolf 4669aebd98aSStefan Weil return 0; 4679aebd98aSStefan Weil 4689aebd98aSStefan Weil fail_free_bmap: 4697267c094SAnthony Liguori g_free(s->bmap); 4709aebd98aSStefan Weil 4719aebd98aSStefan Weil fail: 4729aebd98aSStefan Weil return -1; 4739aebd98aSStefan Weil } 4749aebd98aSStefan Weil 475*e850b35aSStefan Hajnoczi static int coroutine_fn vdi_co_is_allocated(BlockDriverState *bs, 476*e850b35aSStefan Hajnoczi int64_t sector_num, int nb_sectors, int *pnum) 4779aebd98aSStefan Weil { 4789aebd98aSStefan Weil /* TODO: Check for too large sector_num (in bdrv_is_allocated or here). */ 4799aebd98aSStefan Weil BDRVVdiState *s = (BDRVVdiState *)bs->opaque; 4809aebd98aSStefan Weil size_t bmap_index = sector_num / s->block_sectors; 4819aebd98aSStefan Weil size_t sector_in_block = sector_num % s->block_sectors; 4829aebd98aSStefan Weil int n_sectors = s->block_sectors - sector_in_block; 4839aebd98aSStefan Weil uint32_t bmap_entry = le32_to_cpu(s->bmap[bmap_index]); 4849aebd98aSStefan Weil logout("%p, %" PRId64 ", %d, %p\n", bs, sector_num, nb_sectors, pnum); 4859aebd98aSStefan Weil if (n_sectors > nb_sectors) { 4869aebd98aSStefan Weil n_sectors = nb_sectors; 4879aebd98aSStefan Weil } 4889aebd98aSStefan Weil *pnum = n_sectors; 489c794b4e0SEric Sunshine return VDI_IS_ALLOCATED(bmap_entry); 4909aebd98aSStefan Weil } 4919aebd98aSStefan Weil 4929aebd98aSStefan Weil static void vdi_aio_cancel(BlockDriverAIOCB *blockacb) 4939aebd98aSStefan Weil { 4949aebd98aSStefan Weil /* TODO: This code is untested. How can I get it executed? */ 495b666d239SKevin Wolf VdiAIOCB *acb = container_of(blockacb, VdiAIOCB, common); 4969aebd98aSStefan Weil logout("\n"); 4979aebd98aSStefan Weil if (acb->hd_aiocb) { 4989aebd98aSStefan Weil bdrv_aio_cancel(acb->hd_aiocb); 4999aebd98aSStefan Weil } 5009aebd98aSStefan Weil qemu_aio_release(acb); 5019aebd98aSStefan Weil } 5029aebd98aSStefan Weil 5039aebd98aSStefan Weil static AIOPool vdi_aio_pool = { 5049aebd98aSStefan Weil .aiocb_size = sizeof(VdiAIOCB), 5059aebd98aSStefan Weil .cancel = vdi_aio_cancel, 5069aebd98aSStefan Weil }; 5079aebd98aSStefan Weil 5089aebd98aSStefan Weil static VdiAIOCB *vdi_aio_setup(BlockDriverState *bs, int64_t sector_num, 5099aebd98aSStefan Weil QEMUIOVector *qiov, int nb_sectors, 5109aebd98aSStefan Weil BlockDriverCompletionFunc *cb, void *opaque, int is_write) 5119aebd98aSStefan Weil { 5129aebd98aSStefan Weil VdiAIOCB *acb; 5139aebd98aSStefan Weil 5149aebd98aSStefan Weil logout("%p, %" PRId64 ", %p, %d, %p, %p, %d\n", 5159aebd98aSStefan Weil bs, sector_num, qiov, nb_sectors, cb, opaque, is_write); 5169aebd98aSStefan Weil 5179aebd98aSStefan Weil acb = qemu_aio_get(&vdi_aio_pool, bs, cb, opaque); 5189aebd98aSStefan Weil if (acb) { 5199aebd98aSStefan Weil acb->hd_aiocb = NULL; 5209aebd98aSStefan Weil acb->sector_num = sector_num; 5219aebd98aSStefan Weil acb->qiov = qiov; 522e67a64a8SKevin Wolf acb->is_write = is_write; 523e67a64a8SKevin Wolf 5249aebd98aSStefan Weil if (qiov->niov > 1) { 5259aebd98aSStefan Weil acb->buf = qemu_blockalign(bs, qiov->size); 5269aebd98aSStefan Weil acb->orig_buf = acb->buf; 5279aebd98aSStefan Weil if (is_write) { 5289aebd98aSStefan Weil qemu_iovec_to_buffer(qiov, acb->buf); 5299aebd98aSStefan Weil } 5309aebd98aSStefan Weil } else { 5319aebd98aSStefan Weil acb->buf = (uint8_t *)qiov->iov->iov_base; 5329aebd98aSStefan Weil } 5339aebd98aSStefan Weil acb->nb_sectors = nb_sectors; 5349aebd98aSStefan Weil acb->n_sectors = 0; 5359aebd98aSStefan Weil acb->bmap_first = VDI_UNALLOCATED; 5369aebd98aSStefan Weil acb->bmap_last = VDI_UNALLOCATED; 5379aebd98aSStefan Weil acb->block_buffer = NULL; 5389aebd98aSStefan Weil acb->header_modified = 0; 5399aebd98aSStefan Weil } 5409aebd98aSStefan Weil return acb; 5419aebd98aSStefan Weil } 5429aebd98aSStefan Weil 5439aebd98aSStefan Weil static int vdi_schedule_bh(QEMUBHFunc *cb, VdiAIOCB *acb) 5449aebd98aSStefan Weil { 5459aebd98aSStefan Weil logout("\n"); 5469aebd98aSStefan Weil 5479aebd98aSStefan Weil if (acb->bh) { 5489aebd98aSStefan Weil return -EIO; 5499aebd98aSStefan Weil } 5509aebd98aSStefan Weil 5519aebd98aSStefan Weil acb->bh = qemu_bh_new(cb, acb); 5529aebd98aSStefan Weil if (!acb->bh) { 5539aebd98aSStefan Weil return -EIO; 5549aebd98aSStefan Weil } 5559aebd98aSStefan Weil 5569aebd98aSStefan Weil qemu_bh_schedule(acb->bh); 5579aebd98aSStefan Weil 5589aebd98aSStefan Weil return 0; 5599aebd98aSStefan Weil } 5609aebd98aSStefan Weil 5619aebd98aSStefan Weil static void vdi_aio_read_cb(void *opaque, int ret); 562e67a64a8SKevin Wolf static void vdi_aio_write_cb(void *opaque, int ret); 5639aebd98aSStefan Weil 564e67a64a8SKevin Wolf static void vdi_aio_rw_bh(void *opaque) 5659aebd98aSStefan Weil { 5669aebd98aSStefan Weil VdiAIOCB *acb = opaque; 5679aebd98aSStefan Weil logout("\n"); 5689aebd98aSStefan Weil qemu_bh_delete(acb->bh); 5699aebd98aSStefan Weil acb->bh = NULL; 570e67a64a8SKevin Wolf 571e67a64a8SKevin Wolf if (acb->is_write) { 572e67a64a8SKevin Wolf vdi_aio_write_cb(opaque, 0); 573e67a64a8SKevin Wolf } else { 5749aebd98aSStefan Weil vdi_aio_read_cb(opaque, 0); 5759aebd98aSStefan Weil } 576e67a64a8SKevin Wolf } 5779aebd98aSStefan Weil 5789aebd98aSStefan Weil static void vdi_aio_read_cb(void *opaque, int ret) 5799aebd98aSStefan Weil { 5809aebd98aSStefan Weil VdiAIOCB *acb = opaque; 5819aebd98aSStefan Weil BlockDriverState *bs = acb->common.bs; 5829aebd98aSStefan Weil BDRVVdiState *s = bs->opaque; 5839aebd98aSStefan Weil uint32_t bmap_entry; 5849aebd98aSStefan Weil uint32_t block_index; 5859aebd98aSStefan Weil uint32_t sector_in_block; 5869aebd98aSStefan Weil uint32_t n_sectors; 5879aebd98aSStefan Weil 5889aebd98aSStefan Weil logout("%u sectors read\n", acb->n_sectors); 5899aebd98aSStefan Weil 5909aebd98aSStefan Weil acb->hd_aiocb = NULL; 5919aebd98aSStefan Weil 5929aebd98aSStefan Weil if (ret < 0) { 5939aebd98aSStefan Weil goto done; 5949aebd98aSStefan Weil } 5959aebd98aSStefan Weil 5969aebd98aSStefan Weil acb->nb_sectors -= acb->n_sectors; 5979aebd98aSStefan Weil 5989aebd98aSStefan Weil if (acb->nb_sectors == 0) { 5999aebd98aSStefan Weil /* request completed */ 6009aebd98aSStefan Weil ret = 0; 6019aebd98aSStefan Weil goto done; 6029aebd98aSStefan Weil } 6039aebd98aSStefan Weil 6049aebd98aSStefan Weil acb->sector_num += acb->n_sectors; 6059aebd98aSStefan Weil acb->buf += acb->n_sectors * SECTOR_SIZE; 6069aebd98aSStefan Weil 6079aebd98aSStefan Weil block_index = acb->sector_num / s->block_sectors; 6089aebd98aSStefan Weil sector_in_block = acb->sector_num % s->block_sectors; 6099aebd98aSStefan Weil n_sectors = s->block_sectors - sector_in_block; 6109aebd98aSStefan Weil if (n_sectors > acb->nb_sectors) { 6119aebd98aSStefan Weil n_sectors = acb->nb_sectors; 6129aebd98aSStefan Weil } 6139aebd98aSStefan Weil 6149aebd98aSStefan Weil logout("will read %u sectors starting at sector %" PRIu64 "\n", 6159aebd98aSStefan Weil n_sectors, acb->sector_num); 6169aebd98aSStefan Weil 6179aebd98aSStefan Weil /* prepare next AIO request */ 6189aebd98aSStefan Weil acb->n_sectors = n_sectors; 6199aebd98aSStefan Weil bmap_entry = le32_to_cpu(s->bmap[block_index]); 620c794b4e0SEric Sunshine if (!VDI_IS_ALLOCATED(bmap_entry)) { 6219aebd98aSStefan Weil /* Block not allocated, return zeros, no need to wait. */ 6229aebd98aSStefan Weil memset(acb->buf, 0, n_sectors * SECTOR_SIZE); 623e67a64a8SKevin Wolf ret = vdi_schedule_bh(vdi_aio_rw_bh, acb); 6249aebd98aSStefan Weil if (ret < 0) { 6259aebd98aSStefan Weil goto done; 6269aebd98aSStefan Weil } 6279aebd98aSStefan Weil } else { 6289aebd98aSStefan Weil uint64_t offset = s->header.offset_data / SECTOR_SIZE + 6299aebd98aSStefan Weil (uint64_t)bmap_entry * s->block_sectors + 6309aebd98aSStefan Weil sector_in_block; 6319aebd98aSStefan Weil acb->hd_iov.iov_base = (void *)acb->buf; 6329aebd98aSStefan Weil acb->hd_iov.iov_len = n_sectors * SECTOR_SIZE; 6339aebd98aSStefan Weil qemu_iovec_init_external(&acb->hd_qiov, &acb->hd_iov, 1); 63466f82ceeSKevin Wolf acb->hd_aiocb = bdrv_aio_readv(bs->file, offset, &acb->hd_qiov, 6359aebd98aSStefan Weil n_sectors, vdi_aio_read_cb, acb); 6369aebd98aSStefan Weil if (acb->hd_aiocb == NULL) { 63740a892b7SStefan Weil ret = -EIO; 6389aebd98aSStefan Weil goto done; 6399aebd98aSStefan Weil } 6409aebd98aSStefan Weil } 6419aebd98aSStefan Weil return; 6429aebd98aSStefan Weil done: 6439aebd98aSStefan Weil if (acb->qiov->niov > 1) { 6449aebd98aSStefan Weil qemu_iovec_from_buffer(acb->qiov, acb->orig_buf, acb->qiov->size); 6459aebd98aSStefan Weil qemu_vfree(acb->orig_buf); 6469aebd98aSStefan Weil } 6479aebd98aSStefan Weil acb->common.cb(acb->common.opaque, ret); 6489aebd98aSStefan Weil qemu_aio_release(acb); 6499aebd98aSStefan Weil } 6509aebd98aSStefan Weil 6519aebd98aSStefan Weil static BlockDriverAIOCB *vdi_aio_readv(BlockDriverState *bs, 6529aebd98aSStefan Weil int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, 6539aebd98aSStefan Weil BlockDriverCompletionFunc *cb, void *opaque) 6549aebd98aSStefan Weil { 6559aebd98aSStefan Weil VdiAIOCB *acb; 656e67a64a8SKevin Wolf int ret; 657e67a64a8SKevin Wolf 6589aebd98aSStefan Weil logout("\n"); 6599aebd98aSStefan Weil acb = vdi_aio_setup(bs, sector_num, qiov, nb_sectors, cb, opaque, 0); 6609aebd98aSStefan Weil if (!acb) { 6619aebd98aSStefan Weil return NULL; 6629aebd98aSStefan Weil } 663e67a64a8SKevin Wolf 664e67a64a8SKevin Wolf ret = vdi_schedule_bh(vdi_aio_rw_bh, acb); 665e67a64a8SKevin Wolf if (ret < 0) { 666e67a64a8SKevin Wolf if (acb->qiov->niov > 1) { 667e67a64a8SKevin Wolf qemu_vfree(acb->orig_buf); 668e67a64a8SKevin Wolf } 669e67a64a8SKevin Wolf qemu_aio_release(acb); 670e67a64a8SKevin Wolf return NULL; 671e67a64a8SKevin Wolf } 672e67a64a8SKevin Wolf 6739aebd98aSStefan Weil return &acb->common; 6749aebd98aSStefan Weil } 6759aebd98aSStefan Weil 6769aebd98aSStefan Weil static void vdi_aio_write_cb(void *opaque, int ret) 6779aebd98aSStefan Weil { 6789aebd98aSStefan Weil VdiAIOCB *acb = opaque; 6799aebd98aSStefan Weil BlockDriverState *bs = acb->common.bs; 6809aebd98aSStefan Weil BDRVVdiState *s = bs->opaque; 6819aebd98aSStefan Weil uint32_t bmap_entry; 6829aebd98aSStefan Weil uint32_t block_index; 6839aebd98aSStefan Weil uint32_t sector_in_block; 6849aebd98aSStefan Weil uint32_t n_sectors; 6859aebd98aSStefan Weil 6869aebd98aSStefan Weil acb->hd_aiocb = NULL; 6879aebd98aSStefan Weil 6889aebd98aSStefan Weil if (ret < 0) { 6899aebd98aSStefan Weil goto done; 6909aebd98aSStefan Weil } 6919aebd98aSStefan Weil 6929aebd98aSStefan Weil acb->nb_sectors -= acb->n_sectors; 6939aebd98aSStefan Weil acb->sector_num += acb->n_sectors; 6949aebd98aSStefan Weil acb->buf += acb->n_sectors * SECTOR_SIZE; 6959aebd98aSStefan Weil 6969aebd98aSStefan Weil if (acb->nb_sectors == 0) { 6979aebd98aSStefan Weil logout("finished data write\n"); 6989aebd98aSStefan Weil acb->n_sectors = 0; 6999aebd98aSStefan Weil if (acb->header_modified) { 7009aebd98aSStefan Weil VdiHeader *header = acb->block_buffer; 7019aebd98aSStefan Weil logout("now writing modified header\n"); 702c794b4e0SEric Sunshine assert(VDI_IS_ALLOCATED(acb->bmap_first)); 7039aebd98aSStefan Weil *header = s->header; 7049aebd98aSStefan Weil vdi_header_to_le(header); 7059aebd98aSStefan Weil acb->header_modified = 0; 7069aebd98aSStefan Weil acb->hd_iov.iov_base = acb->block_buffer; 7079aebd98aSStefan Weil acb->hd_iov.iov_len = SECTOR_SIZE; 7089aebd98aSStefan Weil qemu_iovec_init_external(&acb->hd_qiov, &acb->hd_iov, 1); 70966f82ceeSKevin Wolf acb->hd_aiocb = bdrv_aio_writev(bs->file, 0, &acb->hd_qiov, 1, 7109aebd98aSStefan Weil vdi_aio_write_cb, acb); 7119aebd98aSStefan Weil if (acb->hd_aiocb == NULL) { 71240a892b7SStefan Weil ret = -EIO; 7139aebd98aSStefan Weil goto done; 7149aebd98aSStefan Weil } 7159aebd98aSStefan Weil return; 716c794b4e0SEric Sunshine } else if (VDI_IS_ALLOCATED(acb->bmap_first)) { 7179aebd98aSStefan Weil /* One or more new blocks were allocated. */ 7189aebd98aSStefan Weil uint64_t offset; 7199aebd98aSStefan Weil uint32_t bmap_first; 7209aebd98aSStefan Weil uint32_t bmap_last; 7217267c094SAnthony Liguori g_free(acb->block_buffer); 7229aebd98aSStefan Weil acb->block_buffer = NULL; 7239aebd98aSStefan Weil bmap_first = acb->bmap_first; 7249aebd98aSStefan Weil bmap_last = acb->bmap_last; 7259aebd98aSStefan Weil logout("now writing modified block map entry %u...%u\n", 7269aebd98aSStefan Weil bmap_first, bmap_last); 7279aebd98aSStefan Weil /* Write modified sectors from block map. */ 7289aebd98aSStefan Weil bmap_first /= (SECTOR_SIZE / sizeof(uint32_t)); 7299aebd98aSStefan Weil bmap_last /= (SECTOR_SIZE / sizeof(uint32_t)); 7309aebd98aSStefan Weil n_sectors = bmap_last - bmap_first + 1; 7319aebd98aSStefan Weil offset = s->bmap_sector + bmap_first; 7329aebd98aSStefan Weil acb->bmap_first = VDI_UNALLOCATED; 733a2a45a26SBlue Swirl acb->hd_iov.iov_base = (void *)((uint8_t *)&s->bmap[0] + 734a2a45a26SBlue Swirl bmap_first * SECTOR_SIZE); 7359aebd98aSStefan Weil acb->hd_iov.iov_len = n_sectors * SECTOR_SIZE; 7369aebd98aSStefan Weil qemu_iovec_init_external(&acb->hd_qiov, &acb->hd_iov, 1); 7379aebd98aSStefan Weil logout("will write %u block map sectors starting from entry %u\n", 7389aebd98aSStefan Weil n_sectors, bmap_first); 73966f82ceeSKevin Wolf acb->hd_aiocb = bdrv_aio_writev(bs->file, offset, &acb->hd_qiov, 7409aebd98aSStefan Weil n_sectors, vdi_aio_write_cb, acb); 7419aebd98aSStefan Weil if (acb->hd_aiocb == NULL) { 74240a892b7SStefan Weil ret = -EIO; 7439aebd98aSStefan Weil goto done; 7449aebd98aSStefan Weil } 7459aebd98aSStefan Weil return; 7469aebd98aSStefan Weil } 7479aebd98aSStefan Weil ret = 0; 7489aebd98aSStefan Weil goto done; 7499aebd98aSStefan Weil } 7509aebd98aSStefan Weil 7519aebd98aSStefan Weil logout("%u sectors written\n", acb->n_sectors); 7529aebd98aSStefan Weil 7539aebd98aSStefan Weil block_index = acb->sector_num / s->block_sectors; 7549aebd98aSStefan Weil sector_in_block = acb->sector_num % s->block_sectors; 7559aebd98aSStefan Weil n_sectors = s->block_sectors - sector_in_block; 7569aebd98aSStefan Weil if (n_sectors > acb->nb_sectors) { 7579aebd98aSStefan Weil n_sectors = acb->nb_sectors; 7589aebd98aSStefan Weil } 7599aebd98aSStefan Weil 7609aebd98aSStefan Weil logout("will write %u sectors starting at sector %" PRIu64 "\n", 7619aebd98aSStefan Weil n_sectors, acb->sector_num); 7629aebd98aSStefan Weil 7639aebd98aSStefan Weil /* prepare next AIO request */ 7649aebd98aSStefan Weil acb->n_sectors = n_sectors; 7659aebd98aSStefan Weil bmap_entry = le32_to_cpu(s->bmap[block_index]); 766c794b4e0SEric Sunshine if (!VDI_IS_ALLOCATED(bmap_entry)) { 7679aebd98aSStefan Weil /* Allocate new block and write to it. */ 7689aebd98aSStefan Weil uint64_t offset; 7699aebd98aSStefan Weil uint8_t *block; 7709aebd98aSStefan Weil bmap_entry = s->header.blocks_allocated; 7719aebd98aSStefan Weil s->bmap[block_index] = cpu_to_le32(bmap_entry); 7729aebd98aSStefan Weil s->header.blocks_allocated++; 7739aebd98aSStefan Weil offset = s->header.offset_data / SECTOR_SIZE + 7749aebd98aSStefan Weil (uint64_t)bmap_entry * s->block_sectors; 7759aebd98aSStefan Weil block = acb->block_buffer; 7769aebd98aSStefan Weil if (block == NULL) { 7777267c094SAnthony Liguori block = g_malloc0(s->block_size); 7789aebd98aSStefan Weil acb->block_buffer = block; 7799aebd98aSStefan Weil acb->bmap_first = block_index; 7809aebd98aSStefan Weil assert(!acb->header_modified); 7819aebd98aSStefan Weil acb->header_modified = 1; 7829aebd98aSStefan Weil } 7839aebd98aSStefan Weil acb->bmap_last = block_index; 7849aebd98aSStefan Weil memcpy(block + sector_in_block * SECTOR_SIZE, 7859aebd98aSStefan Weil acb->buf, n_sectors * SECTOR_SIZE); 786a2a45a26SBlue Swirl acb->hd_iov.iov_base = (void *)block; 7879aebd98aSStefan Weil acb->hd_iov.iov_len = s->block_size; 7889aebd98aSStefan Weil qemu_iovec_init_external(&acb->hd_qiov, &acb->hd_iov, 1); 78966f82ceeSKevin Wolf acb->hd_aiocb = bdrv_aio_writev(bs->file, offset, 7909aebd98aSStefan Weil &acb->hd_qiov, s->block_sectors, 7919aebd98aSStefan Weil vdi_aio_write_cb, acb); 7929aebd98aSStefan Weil if (acb->hd_aiocb == NULL) { 79340a892b7SStefan Weil ret = -EIO; 7949aebd98aSStefan Weil goto done; 7959aebd98aSStefan Weil } 7969aebd98aSStefan Weil } else { 7979aebd98aSStefan Weil uint64_t offset = s->header.offset_data / SECTOR_SIZE + 7989aebd98aSStefan Weil (uint64_t)bmap_entry * s->block_sectors + 7999aebd98aSStefan Weil sector_in_block; 800a2a45a26SBlue Swirl acb->hd_iov.iov_base = (void *)acb->buf; 8019aebd98aSStefan Weil acb->hd_iov.iov_len = n_sectors * SECTOR_SIZE; 8029aebd98aSStefan Weil qemu_iovec_init_external(&acb->hd_qiov, &acb->hd_iov, 1); 80366f82ceeSKevin Wolf acb->hd_aiocb = bdrv_aio_writev(bs->file, offset, &acb->hd_qiov, 8049aebd98aSStefan Weil n_sectors, vdi_aio_write_cb, acb); 8059aebd98aSStefan Weil if (acb->hd_aiocb == NULL) { 80640a892b7SStefan Weil ret = -EIO; 8079aebd98aSStefan Weil goto done; 8089aebd98aSStefan Weil } 8099aebd98aSStefan Weil } 8109aebd98aSStefan Weil 8119aebd98aSStefan Weil return; 8129aebd98aSStefan Weil 8139aebd98aSStefan Weil done: 8149aebd98aSStefan Weil if (acb->qiov->niov > 1) { 8159aebd98aSStefan Weil qemu_vfree(acb->orig_buf); 8169aebd98aSStefan Weil } 8179aebd98aSStefan Weil acb->common.cb(acb->common.opaque, ret); 8189aebd98aSStefan Weil qemu_aio_release(acb); 8199aebd98aSStefan Weil } 8209aebd98aSStefan Weil 8219aebd98aSStefan Weil static BlockDriverAIOCB *vdi_aio_writev(BlockDriverState *bs, 8229aebd98aSStefan Weil int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, 8239aebd98aSStefan Weil BlockDriverCompletionFunc *cb, void *opaque) 8249aebd98aSStefan Weil { 8259aebd98aSStefan Weil VdiAIOCB *acb; 826e67a64a8SKevin Wolf int ret; 827e67a64a8SKevin Wolf 8289aebd98aSStefan Weil logout("\n"); 8299aebd98aSStefan Weil acb = vdi_aio_setup(bs, sector_num, qiov, nb_sectors, cb, opaque, 1); 8309aebd98aSStefan Weil if (!acb) { 8319aebd98aSStefan Weil return NULL; 8329aebd98aSStefan Weil } 833e67a64a8SKevin Wolf 834e67a64a8SKevin Wolf ret = vdi_schedule_bh(vdi_aio_rw_bh, acb); 835e67a64a8SKevin Wolf if (ret < 0) { 836e67a64a8SKevin Wolf if (acb->qiov->niov > 1) { 837e67a64a8SKevin Wolf qemu_vfree(acb->orig_buf); 838e67a64a8SKevin Wolf } 839e67a64a8SKevin Wolf qemu_aio_release(acb); 840e67a64a8SKevin Wolf return NULL; 841e67a64a8SKevin Wolf } 842e67a64a8SKevin Wolf 8439aebd98aSStefan Weil return &acb->common; 8449aebd98aSStefan Weil } 8459aebd98aSStefan Weil 8469aebd98aSStefan Weil static int vdi_create(const char *filename, QEMUOptionParameter *options) 8479aebd98aSStefan Weil { 8489aebd98aSStefan Weil int fd; 8499aebd98aSStefan Weil int result = 0; 8509aebd98aSStefan Weil uint64_t bytes = 0; 8519aebd98aSStefan Weil uint32_t blocks; 85299cce9faSKevin Wolf size_t block_size = DEFAULT_CLUSTER_SIZE; 8539aebd98aSStefan Weil uint32_t image_type = VDI_TYPE_DYNAMIC; 8549aebd98aSStefan Weil VdiHeader header; 8559aebd98aSStefan Weil size_t i; 8569aebd98aSStefan Weil size_t bmap_size; 8579aebd98aSStefan Weil uint32_t *bmap; 8589aebd98aSStefan Weil 8599aebd98aSStefan Weil logout("\n"); 8609aebd98aSStefan Weil 8619aebd98aSStefan Weil /* Read out options. */ 8629aebd98aSStefan Weil while (options && options->name) { 8639aebd98aSStefan Weil if (!strcmp(options->name, BLOCK_OPT_SIZE)) { 8649aebd98aSStefan Weil bytes = options->value.n; 8659aebd98aSStefan Weil #if defined(CONFIG_VDI_BLOCK_SIZE) 8669aebd98aSStefan Weil } else if (!strcmp(options->name, BLOCK_OPT_CLUSTER_SIZE)) { 8679aebd98aSStefan Weil if (options->value.n) { 8689aebd98aSStefan Weil /* TODO: Additional checks (SECTOR_SIZE * 2^n, ...). */ 8699aebd98aSStefan Weil block_size = options->value.n; 8709aebd98aSStefan Weil } 8719aebd98aSStefan Weil #endif 8729aebd98aSStefan Weil #if defined(CONFIG_VDI_STATIC_IMAGE) 8739aebd98aSStefan Weil } else if (!strcmp(options->name, BLOCK_OPT_STATIC)) { 8746eea90ebSStefan Weil if (options->value.n) { 8759aebd98aSStefan Weil image_type = VDI_TYPE_STATIC; 8766eea90ebSStefan Weil } 8779aebd98aSStefan Weil #endif 8789aebd98aSStefan Weil } 8799aebd98aSStefan Weil options++; 8809aebd98aSStefan Weil } 8819aebd98aSStefan Weil 8829aebd98aSStefan Weil fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY | O_LARGEFILE, 8839aebd98aSStefan Weil 0644); 8849aebd98aSStefan Weil if (fd < 0) { 8859aebd98aSStefan Weil return -errno; 8869aebd98aSStefan Weil } 8879aebd98aSStefan Weil 888f21dc3a4SStefan Weil /* We need enough blocks to store the given disk size, 889f21dc3a4SStefan Weil so always round up. */ 890f21dc3a4SStefan Weil blocks = (bytes + block_size - 1) / block_size; 891f21dc3a4SStefan Weil 8929aebd98aSStefan Weil bmap_size = blocks * sizeof(uint32_t); 8939aebd98aSStefan Weil bmap_size = ((bmap_size + SECTOR_SIZE - 1) & ~(SECTOR_SIZE -1)); 8949aebd98aSStefan Weil 8959aebd98aSStefan Weil memset(&header, 0, sizeof(header)); 8961786dc15SBlue Swirl pstrcpy(header.text, sizeof(header.text), VDI_TEXT); 8979aebd98aSStefan Weil header.signature = VDI_SIGNATURE; 8989aebd98aSStefan Weil header.version = VDI_VERSION_1_1; 8999aebd98aSStefan Weil header.header_size = 0x180; 9009aebd98aSStefan Weil header.image_type = image_type; 9019aebd98aSStefan Weil header.offset_bmap = 0x200; 9029aebd98aSStefan Weil header.offset_data = 0x200 + bmap_size; 9039aebd98aSStefan Weil header.sector_size = SECTOR_SIZE; 9049aebd98aSStefan Weil header.disk_size = bytes; 9059aebd98aSStefan Weil header.block_size = block_size; 9069aebd98aSStefan Weil header.blocks_in_image = blocks; 9076eea90ebSStefan Weil if (image_type == VDI_TYPE_STATIC) { 9086eea90ebSStefan Weil header.blocks_allocated = blocks; 9096eea90ebSStefan Weil } 9109aebd98aSStefan Weil uuid_generate(header.uuid_image); 9119aebd98aSStefan Weil uuid_generate(header.uuid_last_snap); 9129aebd98aSStefan Weil /* There is no need to set header.uuid_link or header.uuid_parent here. */ 9139aebd98aSStefan Weil #if defined(CONFIG_VDI_DEBUG) 9149aebd98aSStefan Weil vdi_header_print(&header); 9159aebd98aSStefan Weil #endif 9169aebd98aSStefan Weil vdi_header_to_le(&header); 9179aebd98aSStefan Weil if (write(fd, &header, sizeof(header)) < 0) { 9189aebd98aSStefan Weil result = -errno; 9199aebd98aSStefan Weil } 9209aebd98aSStefan Weil 921b76b6e95SStefan Weil bmap = NULL; 922b76b6e95SStefan Weil if (bmap_size > 0) { 9237267c094SAnthony Liguori bmap = (uint32_t *)g_malloc0(bmap_size); 924b76b6e95SStefan Weil } 9259aebd98aSStefan Weil for (i = 0; i < blocks; i++) { 9269aebd98aSStefan Weil if (image_type == VDI_TYPE_STATIC) { 9279aebd98aSStefan Weil bmap[i] = i; 9289aebd98aSStefan Weil } else { 9299aebd98aSStefan Weil bmap[i] = VDI_UNALLOCATED; 9309aebd98aSStefan Weil } 9319aebd98aSStefan Weil } 9329aebd98aSStefan Weil if (write(fd, bmap, bmap_size) < 0) { 9339aebd98aSStefan Weil result = -errno; 9349aebd98aSStefan Weil } 9357267c094SAnthony Liguori g_free(bmap); 9369aebd98aSStefan Weil if (image_type == VDI_TYPE_STATIC) { 9379aebd98aSStefan Weil if (ftruncate(fd, sizeof(header) + bmap_size + blocks * block_size)) { 9389aebd98aSStefan Weil result = -errno; 9399aebd98aSStefan Weil } 9409aebd98aSStefan Weil } 9419aebd98aSStefan Weil 9429aebd98aSStefan Weil if (close(fd) < 0) { 9439aebd98aSStefan Weil result = -errno; 9449aebd98aSStefan Weil } 9459aebd98aSStefan Weil 9469aebd98aSStefan Weil return result; 9479aebd98aSStefan Weil } 9489aebd98aSStefan Weil 9499aebd98aSStefan Weil static void vdi_close(BlockDriverState *bs) 9509aebd98aSStefan Weil { 951fc9d106cSKevin Wolf BDRVVdiState *s = bs->opaque; 9526ac5f388SKevin Wolf 9536ac5f388SKevin Wolf g_free(s->bmap); 9546ac5f388SKevin Wolf 955fc9d106cSKevin Wolf migrate_del_blocker(s->migration_blocker); 956fc9d106cSKevin Wolf error_free(s->migration_blocker); 9579aebd98aSStefan Weil } 9589aebd98aSStefan Weil 9598b94ff85SPaolo Bonzini static coroutine_fn int vdi_co_flush(BlockDriverState *bs) 9609aebd98aSStefan Weil { 9619aebd98aSStefan Weil logout("\n"); 9628b94ff85SPaolo Bonzini return bdrv_co_flush(bs->file); 9639aebd98aSStefan Weil } 9649aebd98aSStefan Weil 9659aebd98aSStefan Weil 9669aebd98aSStefan Weil static QEMUOptionParameter vdi_create_options[] = { 9679aebd98aSStefan Weil { 9689aebd98aSStefan Weil .name = BLOCK_OPT_SIZE, 9699aebd98aSStefan Weil .type = OPT_SIZE, 9709aebd98aSStefan Weil .help = "Virtual disk size" 9719aebd98aSStefan Weil }, 9729aebd98aSStefan Weil #if defined(CONFIG_VDI_BLOCK_SIZE) 9739aebd98aSStefan Weil { 9749aebd98aSStefan Weil .name = BLOCK_OPT_CLUSTER_SIZE, 9759aebd98aSStefan Weil .type = OPT_SIZE, 97699cce9faSKevin Wolf .help = "VDI cluster (block) size", 97799cce9faSKevin Wolf .value = { .n = DEFAULT_CLUSTER_SIZE }, 9789aebd98aSStefan Weil }, 9799aebd98aSStefan Weil #endif 9809aebd98aSStefan Weil #if defined(CONFIG_VDI_STATIC_IMAGE) 9819aebd98aSStefan Weil { 9829aebd98aSStefan Weil .name = BLOCK_OPT_STATIC, 9839aebd98aSStefan Weil .type = OPT_FLAG, 9849aebd98aSStefan Weil .help = "VDI static (pre-allocated) image" 9859aebd98aSStefan Weil }, 9869aebd98aSStefan Weil #endif 9879aebd98aSStefan Weil /* TODO: An additional option to set UUID values might be useful. */ 9889aebd98aSStefan Weil { NULL } 9899aebd98aSStefan Weil }; 9909aebd98aSStefan Weil 9919aebd98aSStefan Weil static BlockDriver bdrv_vdi = { 9929aebd98aSStefan Weil .format_name = "vdi", 9939aebd98aSStefan Weil .instance_size = sizeof(BDRVVdiState), 9949aebd98aSStefan Weil .bdrv_probe = vdi_probe, 9959aebd98aSStefan Weil .bdrv_open = vdi_open, 9969aebd98aSStefan Weil .bdrv_close = vdi_close, 9979aebd98aSStefan Weil .bdrv_create = vdi_create, 998c68b89acSKevin Wolf .bdrv_co_flush_to_disk = vdi_co_flush, 999*e850b35aSStefan Hajnoczi .bdrv_co_is_allocated = vdi_co_is_allocated, 10009aebd98aSStefan Weil .bdrv_make_empty = vdi_make_empty, 10019aebd98aSStefan Weil 10029aebd98aSStefan Weil .bdrv_aio_readv = vdi_aio_readv, 10039aebd98aSStefan Weil #if defined(CONFIG_VDI_WRITE) 10049aebd98aSStefan Weil .bdrv_aio_writev = vdi_aio_writev, 10059aebd98aSStefan Weil #endif 10069aebd98aSStefan Weil 10079aebd98aSStefan Weil .bdrv_get_info = vdi_get_info, 10089aebd98aSStefan Weil 10099aebd98aSStefan Weil .create_options = vdi_create_options, 10109aebd98aSStefan Weil .bdrv_check = vdi_check, 10119aebd98aSStefan Weil }; 10129aebd98aSStefan Weil 10139aebd98aSStefan Weil static void bdrv_vdi_init(void) 10149aebd98aSStefan Weil { 10159aebd98aSStefan Weil logout("\n"); 10169aebd98aSStefan Weil bdrv_register(&bdrv_vdi); 10179aebd98aSStefan Weil } 10189aebd98aSStefan Weil 10199aebd98aSStefan Weil block_init(bdrv_vdi_init); 1020