19aebd98aSStefan Weil /* 29aebd98aSStefan Weil * Block driver for the Virtual Disk Image (VDI) format 39aebd98aSStefan Weil * 4641543b7SStefan Weil * Copyright (c) 2009, 2012 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 * 34dc6fb73dSDeepak Kathayat * Read and write of adjacent 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 5280c71a24SPeter Maydell #include "qemu/osdep.h" 53da34e65cSMarkus Armbruster #include "qapi/error.h" 54737e150eSPaolo Bonzini #include "block/block_int.h" 55a08f0c3bSKevin Wolf #include "sysemu/block-backend.h" 561de7afc9SPaolo Bonzini #include "qemu/module.h" 5758369e22SPaolo Bonzini #include "qemu/bswap.h" 58caf71f86SPaolo Bonzini #include "migration/migration.h" 5910817bf0SDaniel P. Berrange #include "qemu/coroutine.h" 60f348b6d1SVeronia Bahaa #include "qemu/cutils.h" 619aebd98aSStefan Weil 62ee682d27SStefan Weil #if defined(CONFIG_UUID) 639aebd98aSStefan Weil #include <uuid/uuid.h> 649aebd98aSStefan Weil #else 659aebd98aSStefan Weil /* TODO: move uuid emulation to some central place in QEMU. */ 669c17d615SPaolo Bonzini #include "sysemu/sysemu.h" /* UUID_FMT */ 679aebd98aSStefan Weil typedef unsigned char uuid_t[16]; 689aebd98aSStefan Weil #endif 699aebd98aSStefan Weil 709aebd98aSStefan Weil /* Code configuration options. */ 719aebd98aSStefan Weil 729aebd98aSStefan Weil /* Enable debug messages. */ 739aebd98aSStefan Weil //~ #define CONFIG_VDI_DEBUG 749aebd98aSStefan Weil 759aebd98aSStefan Weil /* Support write operations on VDI images. */ 769aebd98aSStefan Weil #define CONFIG_VDI_WRITE 779aebd98aSStefan Weil 789aebd98aSStefan Weil /* Support non-standard block (cluster) size. This is untested. 799aebd98aSStefan Weil * Maybe it will be needed for very large images. 809aebd98aSStefan Weil */ 819aebd98aSStefan Weil //~ #define CONFIG_VDI_BLOCK_SIZE 829aebd98aSStefan Weil 839aebd98aSStefan Weil /* Support static (fixed, pre-allocated) images. */ 849aebd98aSStefan Weil #define CONFIG_VDI_STATIC_IMAGE 859aebd98aSStefan Weil 869aebd98aSStefan Weil /* Command line option for static images. */ 879aebd98aSStefan Weil #define BLOCK_OPT_STATIC "static" 889aebd98aSStefan Weil 899aebd98aSStefan Weil #define KiB 1024 909aebd98aSStefan Weil #define MiB (KiB * KiB) 919aebd98aSStefan Weil 929aebd98aSStefan Weil #define SECTOR_SIZE 512 9399cce9faSKevin Wolf #define DEFAULT_CLUSTER_SIZE (1 * MiB) 949aebd98aSStefan Weil 959aebd98aSStefan Weil #if defined(CONFIG_VDI_DEBUG) 969aebd98aSStefan Weil #define logout(fmt, ...) \ 979aebd98aSStefan Weil fprintf(stderr, "vdi\t%-24s" fmt, __func__, ##__VA_ARGS__) 989aebd98aSStefan Weil #else 999aebd98aSStefan Weil #define logout(fmt, ...) ((void)0) 1009aebd98aSStefan Weil #endif 1019aebd98aSStefan Weil 1029aebd98aSStefan Weil /* Image signature. */ 1039aebd98aSStefan Weil #define VDI_SIGNATURE 0xbeda107f 1049aebd98aSStefan Weil 1059aebd98aSStefan Weil /* Image version. */ 1069aebd98aSStefan Weil #define VDI_VERSION_1_1 0x00010001 1079aebd98aSStefan Weil 1089aebd98aSStefan Weil /* Image type. */ 1099aebd98aSStefan Weil #define VDI_TYPE_DYNAMIC 1 1109aebd98aSStefan Weil #define VDI_TYPE_STATIC 2 1119aebd98aSStefan Weil 1129aebd98aSStefan Weil /* Innotek / SUN images use these strings in header.text: 1139aebd98aSStefan Weil * "<<< innotek VirtualBox Disk Image >>>\n" 1149aebd98aSStefan Weil * "<<< Sun xVM VirtualBox Disk Image >>>\n" 1159aebd98aSStefan Weil * "<<< Sun VirtualBox Disk Image >>>\n" 1169aebd98aSStefan Weil * The value does not matter, so QEMU created images use a different text. 1179aebd98aSStefan Weil */ 1189aebd98aSStefan Weil #define VDI_TEXT "<<< QEMU VM Virtual Disk Image >>>\n" 1199aebd98aSStefan Weil 120c794b4e0SEric Sunshine /* A never-allocated block; semantically arbitrary content. */ 121c794b4e0SEric Sunshine #define VDI_UNALLOCATED 0xffffffffU 122c794b4e0SEric Sunshine 123c794b4e0SEric Sunshine /* A discarded (no longer allocated) block; semantically zero-filled. */ 124c794b4e0SEric Sunshine #define VDI_DISCARDED 0xfffffffeU 125c794b4e0SEric Sunshine 126c794b4e0SEric Sunshine #define VDI_IS_ALLOCATED(X) ((X) < VDI_DISCARDED) 1279aebd98aSStefan Weil 128d20418eeSMax Reitz /* The bmap will take up VDI_BLOCKS_IN_IMAGE_MAX * sizeof(uint32_t) bytes; since 129d20418eeSMax Reitz * the bmap is read and written in a single operation, its size needs to be 130d20418eeSMax Reitz * limited to INT_MAX; furthermore, when opening an image, the bmap size is 131d20418eeSMax Reitz * rounded up to be aligned on BDRV_SECTOR_SIZE. 132d20418eeSMax Reitz * Therefore this should satisfy the following: 133d20418eeSMax Reitz * VDI_BLOCKS_IN_IMAGE_MAX * sizeof(uint32_t) + BDRV_SECTOR_SIZE == INT_MAX + 1 134d20418eeSMax Reitz * (INT_MAX + 1 is the first value not representable as an int) 135d20418eeSMax Reitz * This guarantees that any value below or equal to the constant will, when 136d20418eeSMax Reitz * multiplied by sizeof(uint32_t) and rounded up to a BDRV_SECTOR_SIZE boundary, 137d20418eeSMax Reitz * still be below or equal to INT_MAX. */ 138d20418eeSMax Reitz #define VDI_BLOCKS_IN_IMAGE_MAX \ 139d20418eeSMax Reitz ((unsigned)((INT_MAX + 1u - BDRV_SECTOR_SIZE) / sizeof(uint32_t))) 14063fa06dcSJeff Cody #define VDI_DISK_SIZE_MAX ((uint64_t)VDI_BLOCKS_IN_IMAGE_MAX * \ 14163fa06dcSJeff Cody (uint64_t)DEFAULT_CLUSTER_SIZE) 14263fa06dcSJeff Cody 143ee682d27SStefan Weil #if !defined(CONFIG_UUID) 1448ba2aae3SStefan Hajnoczi static inline void uuid_generate(uuid_t out) 1459aebd98aSStefan Weil { 1464f3669eaSStefan Weil memset(out, 0, sizeof(uuid_t)); 1479aebd98aSStefan Weil } 1489aebd98aSStefan Weil 1498ba2aae3SStefan Hajnoczi static inline int uuid_is_null(const uuid_t uu) 1509aebd98aSStefan Weil { 1519aebd98aSStefan Weil uuid_t null_uuid = { 0 }; 1524f3669eaSStefan Weil return memcmp(uu, null_uuid, sizeof(uuid_t)) == 0; 1539aebd98aSStefan Weil } 1549aebd98aSStefan Weil 155f18a768eSSeokYeon Hwang # if defined(CONFIG_VDI_DEBUG) 1568ba2aae3SStefan Hajnoczi static inline void uuid_unparse(const uuid_t uu, char *out) 1579aebd98aSStefan Weil { 1589aebd98aSStefan Weil snprintf(out, 37, UUID_FMT, 1599aebd98aSStefan Weil uu[0], uu[1], uu[2], uu[3], uu[4], uu[5], uu[6], uu[7], 1609aebd98aSStefan Weil uu[8], uu[9], uu[10], uu[11], uu[12], uu[13], uu[14], uu[15]); 1619aebd98aSStefan Weil } 1629aebd98aSStefan Weil # endif 163f18a768eSSeokYeon Hwang #endif 1649aebd98aSStefan Weil 1659aebd98aSStefan Weil typedef struct { 1669aebd98aSStefan Weil char text[0x40]; 1679aebd98aSStefan Weil uint32_t signature; 1689aebd98aSStefan Weil uint32_t version; 1699aebd98aSStefan Weil uint32_t header_size; 1709aebd98aSStefan Weil uint32_t image_type; 1719aebd98aSStefan Weil uint32_t image_flags; 1729aebd98aSStefan Weil char description[256]; 1739aebd98aSStefan Weil uint32_t offset_bmap; 1749aebd98aSStefan Weil uint32_t offset_data; 1759aebd98aSStefan Weil uint32_t cylinders; /* disk geometry, unused here */ 1769aebd98aSStefan Weil uint32_t heads; /* disk geometry, unused here */ 1779aebd98aSStefan Weil uint32_t sectors; /* disk geometry, unused here */ 1789aebd98aSStefan Weil uint32_t sector_size; 1799aebd98aSStefan Weil uint32_t unused1; 1809aebd98aSStefan Weil uint64_t disk_size; 1819aebd98aSStefan Weil uint32_t block_size; 1829aebd98aSStefan Weil uint32_t block_extra; /* unused here */ 1839aebd98aSStefan Weil uint32_t blocks_in_image; 1849aebd98aSStefan Weil uint32_t blocks_allocated; 1859aebd98aSStefan Weil uuid_t uuid_image; 1869aebd98aSStefan Weil uuid_t uuid_last_snap; 1879aebd98aSStefan Weil uuid_t uuid_link; 1889aebd98aSStefan Weil uuid_t uuid_parent; 1899aebd98aSStefan Weil uint64_t unused2[7]; 1908368febdSJeff Cody } QEMU_PACKED VdiHeader; 1919aebd98aSStefan Weil 1929aebd98aSStefan Weil typedef struct { 1939aebd98aSStefan Weil /* The block map entries are little endian (even in memory). */ 1949aebd98aSStefan Weil uint32_t *bmap; 1959aebd98aSStefan Weil /* Size of block (bytes). */ 1969aebd98aSStefan Weil uint32_t block_size; 1979aebd98aSStefan Weil /* Size of block (sectors). */ 1989aebd98aSStefan Weil uint32_t block_sectors; 1999aebd98aSStefan Weil /* First sector of block map. */ 2009aebd98aSStefan Weil uint32_t bmap_sector; 2014ff9786cSStefan Weil /* VDI header (converted to host endianness). */ 2029aebd98aSStefan Weil VdiHeader header; 203fc9d106cSKevin Wolf 204f0ab6f10SMax Reitz CoMutex write_lock; 205f0ab6f10SMax Reitz 206fc9d106cSKevin Wolf Error *migration_blocker; 2079aebd98aSStefan Weil } BDRVVdiState; 2089aebd98aSStefan Weil 2099aebd98aSStefan Weil /* Change UUID from little endian (IPRT = VirtualBox format) to big endian 2109aebd98aSStefan Weil * format (network byte order, standard, see RFC 4122) and vice versa. 2119aebd98aSStefan Weil */ 2129aebd98aSStefan Weil static void uuid_convert(uuid_t uuid) 2139aebd98aSStefan Weil { 2149aebd98aSStefan Weil bswap32s((uint32_t *)&uuid[0]); 2159aebd98aSStefan Weil bswap16s((uint16_t *)&uuid[4]); 2169aebd98aSStefan Weil bswap16s((uint16_t *)&uuid[6]); 2179aebd98aSStefan Weil } 2189aebd98aSStefan Weil 2199aebd98aSStefan Weil static void vdi_header_to_cpu(VdiHeader *header) 2209aebd98aSStefan Weil { 2219aebd98aSStefan Weil le32_to_cpus(&header->signature); 2229aebd98aSStefan Weil le32_to_cpus(&header->version); 2239aebd98aSStefan Weil le32_to_cpus(&header->header_size); 2249aebd98aSStefan Weil le32_to_cpus(&header->image_type); 2259aebd98aSStefan Weil le32_to_cpus(&header->image_flags); 2269aebd98aSStefan Weil le32_to_cpus(&header->offset_bmap); 2279aebd98aSStefan Weil le32_to_cpus(&header->offset_data); 2289aebd98aSStefan Weil le32_to_cpus(&header->cylinders); 2299aebd98aSStefan Weil le32_to_cpus(&header->heads); 2309aebd98aSStefan Weil le32_to_cpus(&header->sectors); 2319aebd98aSStefan Weil le32_to_cpus(&header->sector_size); 2329aebd98aSStefan Weil le64_to_cpus(&header->disk_size); 2339aebd98aSStefan Weil le32_to_cpus(&header->block_size); 2349aebd98aSStefan Weil le32_to_cpus(&header->block_extra); 2359aebd98aSStefan Weil le32_to_cpus(&header->blocks_in_image); 2369aebd98aSStefan Weil le32_to_cpus(&header->blocks_allocated); 2379aebd98aSStefan Weil uuid_convert(header->uuid_image); 2389aebd98aSStefan Weil uuid_convert(header->uuid_last_snap); 2399aebd98aSStefan Weil uuid_convert(header->uuid_link); 2409aebd98aSStefan Weil uuid_convert(header->uuid_parent); 2419aebd98aSStefan Weil } 2429aebd98aSStefan Weil 2439aebd98aSStefan Weil static void vdi_header_to_le(VdiHeader *header) 2449aebd98aSStefan Weil { 2459aebd98aSStefan Weil cpu_to_le32s(&header->signature); 2469aebd98aSStefan Weil cpu_to_le32s(&header->version); 2479aebd98aSStefan Weil cpu_to_le32s(&header->header_size); 2489aebd98aSStefan Weil cpu_to_le32s(&header->image_type); 2499aebd98aSStefan Weil cpu_to_le32s(&header->image_flags); 2509aebd98aSStefan Weil cpu_to_le32s(&header->offset_bmap); 2519aebd98aSStefan Weil cpu_to_le32s(&header->offset_data); 2529aebd98aSStefan Weil cpu_to_le32s(&header->cylinders); 2539aebd98aSStefan Weil cpu_to_le32s(&header->heads); 2549aebd98aSStefan Weil cpu_to_le32s(&header->sectors); 2559aebd98aSStefan Weil cpu_to_le32s(&header->sector_size); 2569aebd98aSStefan Weil cpu_to_le64s(&header->disk_size); 2579aebd98aSStefan Weil cpu_to_le32s(&header->block_size); 2589aebd98aSStefan Weil cpu_to_le32s(&header->block_extra); 2599aebd98aSStefan Weil cpu_to_le32s(&header->blocks_in_image); 2609aebd98aSStefan Weil cpu_to_le32s(&header->blocks_allocated); 2619aebd98aSStefan Weil uuid_convert(header->uuid_image); 2629aebd98aSStefan Weil uuid_convert(header->uuid_last_snap); 2639aebd98aSStefan Weil uuid_convert(header->uuid_link); 2649aebd98aSStefan Weil uuid_convert(header->uuid_parent); 2659aebd98aSStefan Weil } 2669aebd98aSStefan Weil 2679aebd98aSStefan Weil #if defined(CONFIG_VDI_DEBUG) 2689aebd98aSStefan Weil static void vdi_header_print(VdiHeader *header) 2699aebd98aSStefan Weil { 2709aebd98aSStefan Weil char uuid[37]; 2719aebd98aSStefan Weil logout("text %s", header->text); 2729f0470bbSStefan Weil logout("signature 0x%08x\n", header->signature); 2739aebd98aSStefan Weil logout("header size 0x%04x\n", header->header_size); 2749aebd98aSStefan Weil logout("image type 0x%04x\n", header->image_type); 2759aebd98aSStefan Weil logout("image flags 0x%04x\n", header->image_flags); 2769aebd98aSStefan Weil logout("description %s\n", header->description); 2779aebd98aSStefan Weil logout("offset bmap 0x%04x\n", header->offset_bmap); 2789aebd98aSStefan Weil logout("offset data 0x%04x\n", header->offset_data); 2799aebd98aSStefan Weil logout("cylinders 0x%04x\n", header->cylinders); 2809aebd98aSStefan Weil logout("heads 0x%04x\n", header->heads); 2819aebd98aSStefan Weil logout("sectors 0x%04x\n", header->sectors); 2829aebd98aSStefan Weil logout("sector size 0x%04x\n", header->sector_size); 2839aebd98aSStefan Weil logout("image size 0x%" PRIx64 " B (%" PRIu64 " MiB)\n", 2849aebd98aSStefan Weil header->disk_size, header->disk_size / MiB); 2859aebd98aSStefan Weil logout("block size 0x%04x\n", header->block_size); 2869aebd98aSStefan Weil logout("block extra 0x%04x\n", header->block_extra); 2879aebd98aSStefan Weil logout("blocks tot. 0x%04x\n", header->blocks_in_image); 2889aebd98aSStefan Weil logout("blocks all. 0x%04x\n", header->blocks_allocated); 2899aebd98aSStefan Weil uuid_unparse(header->uuid_image, uuid); 2909aebd98aSStefan Weil logout("uuid image %s\n", uuid); 2919aebd98aSStefan Weil uuid_unparse(header->uuid_last_snap, uuid); 2929aebd98aSStefan Weil logout("uuid snap %s\n", uuid); 2939aebd98aSStefan Weil uuid_unparse(header->uuid_link, uuid); 2949aebd98aSStefan Weil logout("uuid link %s\n", uuid); 2959aebd98aSStefan Weil uuid_unparse(header->uuid_parent, uuid); 2969aebd98aSStefan Weil logout("uuid parent %s\n", uuid); 2979aebd98aSStefan Weil } 2989aebd98aSStefan Weil #endif 2999aebd98aSStefan Weil 3004534ff54SKevin Wolf static int vdi_check(BlockDriverState *bs, BdrvCheckResult *res, 3014534ff54SKevin Wolf BdrvCheckMode fix) 3029aebd98aSStefan Weil { 3039aebd98aSStefan Weil /* TODO: additional checks possible. */ 3049aebd98aSStefan Weil BDRVVdiState *s = (BDRVVdiState *)bs->opaque; 3059aebd98aSStefan Weil uint32_t blocks_allocated = 0; 3069aebd98aSStefan Weil uint32_t block; 3079aebd98aSStefan Weil uint32_t *bmap; 3089aebd98aSStefan Weil logout("\n"); 3099aebd98aSStefan Weil 3104534ff54SKevin Wolf if (fix) { 3114534ff54SKevin Wolf return -ENOTSUP; 3124534ff54SKevin Wolf } 3134534ff54SKevin Wolf 3145839e53bSMarkus Armbruster bmap = g_try_new(uint32_t, s->header.blocks_in_image); 31517cce735SKevin Wolf if (s->header.blocks_in_image && bmap == NULL) { 31617cce735SKevin Wolf res->check_errors++; 31717cce735SKevin Wolf return -ENOMEM; 31817cce735SKevin Wolf } 31917cce735SKevin Wolf 3209aebd98aSStefan Weil memset(bmap, 0xff, s->header.blocks_in_image * sizeof(uint32_t)); 3219aebd98aSStefan Weil 3229aebd98aSStefan Weil /* Check block map and value of blocks_allocated. */ 3239aebd98aSStefan Weil for (block = 0; block < s->header.blocks_in_image; block++) { 3249aebd98aSStefan Weil uint32_t bmap_entry = le32_to_cpu(s->bmap[block]); 325c794b4e0SEric Sunshine if (VDI_IS_ALLOCATED(bmap_entry)) { 3269aebd98aSStefan Weil if (bmap_entry < s->header.blocks_in_image) { 3279aebd98aSStefan Weil blocks_allocated++; 328c794b4e0SEric Sunshine if (!VDI_IS_ALLOCATED(bmap[bmap_entry])) { 3299aebd98aSStefan Weil bmap[bmap_entry] = bmap_entry; 3309aebd98aSStefan Weil } else { 3319aebd98aSStefan Weil fprintf(stderr, "ERROR: block index %" PRIu32 3329aebd98aSStefan Weil " also used by %" PRIu32 "\n", bmap[bmap_entry], bmap_entry); 3339ac228e0SKevin Wolf res->corruptions++; 3349aebd98aSStefan Weil } 3359aebd98aSStefan Weil } else { 3369aebd98aSStefan Weil fprintf(stderr, "ERROR: block index %" PRIu32 3379aebd98aSStefan Weil " too large, is %" PRIu32 "\n", block, bmap_entry); 3389ac228e0SKevin Wolf res->corruptions++; 3399aebd98aSStefan Weil } 3409aebd98aSStefan Weil } 3419aebd98aSStefan Weil } 3429aebd98aSStefan Weil if (blocks_allocated != s->header.blocks_allocated) { 3439aebd98aSStefan Weil fprintf(stderr, "ERROR: allocated blocks mismatch, is %" PRIu32 3449aebd98aSStefan Weil ", should be %" PRIu32 "\n", 3459aebd98aSStefan Weil blocks_allocated, s->header.blocks_allocated); 3469ac228e0SKevin Wolf res->corruptions++; 3479aebd98aSStefan Weil } 3489aebd98aSStefan Weil 3497267c094SAnthony Liguori g_free(bmap); 3509aebd98aSStefan Weil 3519ac228e0SKevin Wolf return 0; 3529aebd98aSStefan Weil } 3539aebd98aSStefan Weil 3549aebd98aSStefan Weil static int vdi_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) 3559aebd98aSStefan Weil { 3569aebd98aSStefan Weil /* TODO: vdi_get_info would be needed for machine snapshots. 3579aebd98aSStefan Weil vm_state_offset is still missing. */ 3589aebd98aSStefan Weil BDRVVdiState *s = (BDRVVdiState *)bs->opaque; 3599aebd98aSStefan Weil logout("\n"); 3609aebd98aSStefan Weil bdi->cluster_size = s->block_size; 3619aebd98aSStefan Weil bdi->vm_state_offset = 0; 36295de6d70SPaolo Bonzini bdi->unallocated_blocks_are_zero = true; 3639aebd98aSStefan Weil return 0; 3649aebd98aSStefan Weil } 3659aebd98aSStefan Weil 3669aebd98aSStefan Weil static int vdi_make_empty(BlockDriverState *bs) 3679aebd98aSStefan Weil { 3689aebd98aSStefan Weil /* TODO: missing code. */ 3699aebd98aSStefan Weil logout("\n"); 3709aebd98aSStefan Weil /* The return value for missing code must be 0, see block.c. */ 3719aebd98aSStefan Weil return 0; 3729aebd98aSStefan Weil } 3739aebd98aSStefan Weil 3749aebd98aSStefan Weil static int vdi_probe(const uint8_t *buf, int buf_size, const char *filename) 3759aebd98aSStefan Weil { 3769aebd98aSStefan Weil const VdiHeader *header = (const VdiHeader *)buf; 377dddc7750SJeff Cody int ret = 0; 3789aebd98aSStefan Weil 3799aebd98aSStefan Weil logout("\n"); 3809aebd98aSStefan Weil 3819aebd98aSStefan Weil if (buf_size < sizeof(*header)) { 3829aebd98aSStefan Weil /* Header too small, no VDI. */ 3839aebd98aSStefan Weil } else if (le32_to_cpu(header->signature) == VDI_SIGNATURE) { 384dddc7750SJeff Cody ret = 100; 3859aebd98aSStefan Weil } 3869aebd98aSStefan Weil 387dddc7750SJeff Cody if (ret == 0) { 3889aebd98aSStefan Weil logout("no vdi image\n"); 3899aebd98aSStefan Weil } else { 3909aebd98aSStefan Weil logout("%s", header->text); 3919aebd98aSStefan Weil } 3929aebd98aSStefan Weil 393dddc7750SJeff Cody return ret; 3949aebd98aSStefan Weil } 3959aebd98aSStefan Weil 396015a1036SMax Reitz static int vdi_open(BlockDriverState *bs, QDict *options, int flags, 397015a1036SMax Reitz Error **errp) 3989aebd98aSStefan Weil { 3999aebd98aSStefan Weil BDRVVdiState *s = bs->opaque; 4009aebd98aSStefan Weil VdiHeader header; 4019aebd98aSStefan Weil size_t bmap_size; 4028937f822SStefan Weil int ret; 4039aebd98aSStefan Weil 4049aebd98aSStefan Weil logout("\n"); 4059aebd98aSStefan Weil 406*fbcbbf4eSKevin Wolf ret = bdrv_read(bs->file, 0, (uint8_t *)&header, 1); 4078937f822SStefan Weil if (ret < 0) { 4089aebd98aSStefan Weil goto fail; 4099aebd98aSStefan Weil } 4109aebd98aSStefan Weil 4119aebd98aSStefan Weil vdi_header_to_cpu(&header); 4129aebd98aSStefan Weil #if defined(CONFIG_VDI_DEBUG) 4139aebd98aSStefan Weil vdi_header_print(&header); 4149aebd98aSStefan Weil #endif 4159aebd98aSStefan Weil 41663fa06dcSJeff Cody if (header.disk_size > VDI_DISK_SIZE_MAX) { 41763fa06dcSJeff Cody error_setg(errp, "Unsupported VDI image size (size is 0x%" PRIx64 41863fa06dcSJeff Cody ", max supported is 0x%" PRIx64 ")", 41963fa06dcSJeff Cody header.disk_size, VDI_DISK_SIZE_MAX); 42063fa06dcSJeff Cody ret = -ENOTSUP; 42163fa06dcSJeff Cody goto fail; 42263fa06dcSJeff Cody } 42363fa06dcSJeff Cody 424f21dc3a4SStefan Weil if (header.disk_size % SECTOR_SIZE != 0) { 425f21dc3a4SStefan Weil /* 'VBoxManage convertfromraw' can create images with odd disk sizes. 426f21dc3a4SStefan Weil We accept them but round the disk size to the next multiple of 427f21dc3a4SStefan Weil SECTOR_SIZE. */ 428f21dc3a4SStefan Weil logout("odd disk size %" PRIu64 " B, round up\n", header.disk_size); 429e9082e47SMax Reitz header.disk_size = ROUND_UP(header.disk_size, SECTOR_SIZE); 430f21dc3a4SStefan Weil } 431f21dc3a4SStefan Weil 4320e87ba2cSStefan Weil if (header.signature != VDI_SIGNATURE) { 433521b2b5dSMax Reitz error_setg(errp, "Image not in VDI format (bad signature %08" PRIx32 434521b2b5dSMax Reitz ")", header.signature); 43576abe407SPaolo Bonzini ret = -EINVAL; 4360e87ba2cSStefan Weil goto fail; 4370e87ba2cSStefan Weil } else if (header.version != VDI_VERSION_1_1) { 438521b2b5dSMax Reitz error_setg(errp, "unsupported VDI image (version %" PRIu32 ".%" PRIu32 439521b2b5dSMax Reitz ")", header.version >> 16, header.version & 0xffff); 4408937f822SStefan Weil ret = -ENOTSUP; 4419aebd98aSStefan Weil goto fail; 4429aebd98aSStefan Weil } else if (header.offset_bmap % SECTOR_SIZE != 0) { 4439aebd98aSStefan Weil /* We only support block maps which start on a sector boundary. */ 4445b7aa9b5SPaolo Bonzini error_setg(errp, "unsupported VDI image (unaligned block map offset " 445521b2b5dSMax Reitz "0x%" PRIx32 ")", header.offset_bmap); 4468937f822SStefan Weil ret = -ENOTSUP; 4479aebd98aSStefan Weil goto fail; 4489aebd98aSStefan Weil } else if (header.offset_data % SECTOR_SIZE != 0) { 4499aebd98aSStefan Weil /* We only support data blocks which start on a sector boundary. */ 450521b2b5dSMax Reitz error_setg(errp, "unsupported VDI image (unaligned data offset 0x%" 451521b2b5dSMax Reitz PRIx32 ")", header.offset_data); 4528937f822SStefan Weil ret = -ENOTSUP; 4539aebd98aSStefan Weil goto fail; 4549aebd98aSStefan Weil } else if (header.sector_size != SECTOR_SIZE) { 455521b2b5dSMax Reitz error_setg(errp, "unsupported VDI image (sector size %" PRIu32 456521b2b5dSMax Reitz " is not %u)", header.sector_size, SECTOR_SIZE); 4578937f822SStefan Weil ret = -ENOTSUP; 4589aebd98aSStefan Weil goto fail; 45963fa06dcSJeff Cody } else if (header.block_size != DEFAULT_CLUSTER_SIZE) { 460521b2b5dSMax Reitz error_setg(errp, "unsupported VDI image (block size %" PRIu32 461521b2b5dSMax Reitz " is not %u)", header.block_size, DEFAULT_CLUSTER_SIZE); 4628937f822SStefan Weil ret = -ENOTSUP; 4639aebd98aSStefan Weil goto fail; 464f21dc3a4SStefan Weil } else if (header.disk_size > 465f21dc3a4SStefan Weil (uint64_t)header.blocks_in_image * header.block_size) { 4665b7aa9b5SPaolo Bonzini error_setg(errp, "unsupported VDI image (disk size %" PRIu64 ", " 4675b7aa9b5SPaolo Bonzini "image bitmap has room for %" PRIu64 ")", 4685b7aa9b5SPaolo Bonzini header.disk_size, 4695b7aa9b5SPaolo Bonzini (uint64_t)header.blocks_in_image * header.block_size); 4708937f822SStefan Weil ret = -ENOTSUP; 4719aebd98aSStefan Weil goto fail; 4729aebd98aSStefan Weil } else if (!uuid_is_null(header.uuid_link)) { 4735b7aa9b5SPaolo Bonzini error_setg(errp, "unsupported VDI image (non-NULL link UUID)"); 4748937f822SStefan Weil ret = -ENOTSUP; 4759aebd98aSStefan Weil goto fail; 4769aebd98aSStefan Weil } else if (!uuid_is_null(header.uuid_parent)) { 4775b7aa9b5SPaolo Bonzini error_setg(errp, "unsupported VDI image (non-NULL parent UUID)"); 4788937f822SStefan Weil ret = -ENOTSUP; 4799aebd98aSStefan Weil goto fail; 48063fa06dcSJeff Cody } else if (header.blocks_in_image > VDI_BLOCKS_IN_IMAGE_MAX) { 48163fa06dcSJeff Cody error_setg(errp, "unsupported VDI image " 48263fa06dcSJeff Cody "(too many blocks %u, max is %u)", 48363fa06dcSJeff Cody header.blocks_in_image, VDI_BLOCKS_IN_IMAGE_MAX); 48463fa06dcSJeff Cody ret = -ENOTSUP; 48563fa06dcSJeff Cody goto fail; 4869aebd98aSStefan Weil } 4879aebd98aSStefan Weil 4889aebd98aSStefan Weil bs->total_sectors = header.disk_size / SECTOR_SIZE; 4899aebd98aSStefan Weil 4909aebd98aSStefan Weil s->block_size = header.block_size; 4919aebd98aSStefan Weil s->block_sectors = header.block_size / SECTOR_SIZE; 4929aebd98aSStefan Weil s->bmap_sector = header.offset_bmap / SECTOR_SIZE; 4939aebd98aSStefan Weil s->header = header; 4949aebd98aSStefan Weil 4959aebd98aSStefan Weil bmap_size = header.blocks_in_image * sizeof(uint32_t); 496e9082e47SMax Reitz bmap_size = DIV_ROUND_UP(bmap_size, SECTOR_SIZE); 4979a4f4c31SKevin Wolf s->bmap = qemu_try_blockalign(bs->file->bs, bmap_size * SECTOR_SIZE); 49817cce735SKevin Wolf if (s->bmap == NULL) { 49917cce735SKevin Wolf ret = -ENOMEM; 50017cce735SKevin Wolf goto fail; 50117cce735SKevin Wolf } 50217cce735SKevin Wolf 503*fbcbbf4eSKevin Wolf ret = bdrv_read(bs->file, s->bmap_sector, (uint8_t *)s->bmap, 5049a4f4c31SKevin Wolf bmap_size); 5058937f822SStefan Weil if (ret < 0) { 5069aebd98aSStefan Weil goto fail_free_bmap; 5079aebd98aSStefan Weil } 5089aebd98aSStefan Weil 509fc9d106cSKevin Wolf /* Disable migration when vdi images are used */ 51081e5f78aSAlberto Garcia error_setg(&s->migration_blocker, "The vdi format used by node '%s' " 51181e5f78aSAlberto Garcia "does not support live migration", 51281e5f78aSAlberto Garcia bdrv_get_device_or_node_name(bs)); 513fc9d106cSKevin Wolf migrate_add_blocker(s->migration_blocker); 514fc9d106cSKevin Wolf 515f0ab6f10SMax Reitz qemu_co_mutex_init(&s->write_lock); 516f0ab6f10SMax Reitz 5179aebd98aSStefan Weil return 0; 5189aebd98aSStefan Weil 5199aebd98aSStefan Weil fail_free_bmap: 52017cce735SKevin Wolf qemu_vfree(s->bmap); 5219aebd98aSStefan Weil 5229aebd98aSStefan Weil fail: 5238937f822SStefan Weil return ret; 5249aebd98aSStefan Weil } 5259aebd98aSStefan Weil 526ecfe2bbaSJeff Cody static int vdi_reopen_prepare(BDRVReopenState *state, 527ecfe2bbaSJeff Cody BlockReopenQueue *queue, Error **errp) 528ecfe2bbaSJeff Cody { 529ecfe2bbaSJeff Cody return 0; 530ecfe2bbaSJeff Cody } 531ecfe2bbaSJeff Cody 532b6b8a333SPaolo Bonzini static int64_t coroutine_fn vdi_co_get_block_status(BlockDriverState *bs, 53367a0fd2aSFam Zheng int64_t sector_num, int nb_sectors, int *pnum, BlockDriverState **file) 5349aebd98aSStefan Weil { 5359aebd98aSStefan Weil /* TODO: Check for too large sector_num (in bdrv_is_allocated or here). */ 5369aebd98aSStefan Weil BDRVVdiState *s = (BDRVVdiState *)bs->opaque; 5379aebd98aSStefan Weil size_t bmap_index = sector_num / s->block_sectors; 5389aebd98aSStefan Weil size_t sector_in_block = sector_num % s->block_sectors; 5399aebd98aSStefan Weil int n_sectors = s->block_sectors - sector_in_block; 5409aebd98aSStefan Weil uint32_t bmap_entry = le32_to_cpu(s->bmap[bmap_index]); 5414bc74be9SPaolo Bonzini uint64_t offset; 5424bc74be9SPaolo Bonzini int result; 5434bc74be9SPaolo Bonzini 5449aebd98aSStefan Weil logout("%p, %" PRId64 ", %d, %p\n", bs, sector_num, nb_sectors, pnum); 5459aebd98aSStefan Weil if (n_sectors > nb_sectors) { 5469aebd98aSStefan Weil n_sectors = nb_sectors; 5479aebd98aSStefan Weil } 5489aebd98aSStefan Weil *pnum = n_sectors; 5494bc74be9SPaolo Bonzini result = VDI_IS_ALLOCATED(bmap_entry); 5504bc74be9SPaolo Bonzini if (!result) { 5514bc74be9SPaolo Bonzini return 0; 5524bc74be9SPaolo Bonzini } 5534bc74be9SPaolo Bonzini 5544bc74be9SPaolo Bonzini offset = s->header.offset_data + 5554bc74be9SPaolo Bonzini (uint64_t)bmap_entry * s->block_size + 5564bc74be9SPaolo Bonzini sector_in_block * SECTOR_SIZE; 5578bfb1371SFam Zheng *file = bs->file->bs; 5584bc74be9SPaolo Bonzini return BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID | offset; 5599aebd98aSStefan Weil } 5609aebd98aSStefan Weil 5610865bb6fSKevin Wolf static int coroutine_fn 5620865bb6fSKevin Wolf vdi_co_preadv(BlockDriverState *bs, uint64_t offset, uint64_t bytes, 5630865bb6fSKevin Wolf QEMUIOVector *qiov, int flags) 5649aebd98aSStefan Weil { 5659aebd98aSStefan Weil BDRVVdiState *s = bs->opaque; 5660865bb6fSKevin Wolf QEMUIOVector local_qiov; 5679aebd98aSStefan Weil uint32_t bmap_entry; 5689aebd98aSStefan Weil uint32_t block_index; 5690865bb6fSKevin Wolf uint32_t offset_in_block; 5700865bb6fSKevin Wolf uint32_t n_bytes; 5710865bb6fSKevin Wolf uint64_t bytes_done = 0; 572eb9566d1SPaolo Bonzini int ret = 0; 5734de659e8SPaolo Bonzini 5744de659e8SPaolo Bonzini logout("\n"); 5759aebd98aSStefan Weil 5760865bb6fSKevin Wolf qemu_iovec_init(&local_qiov, qiov->niov); 5779aebd98aSStefan Weil 5780865bb6fSKevin Wolf while (ret >= 0 && bytes > 0) { 5790865bb6fSKevin Wolf block_index = offset / s->block_size; 5800865bb6fSKevin Wolf offset_in_block = offset % s->block_size; 5810865bb6fSKevin Wolf n_bytes = MIN(bytes, s->block_size - offset_in_block); 5820865bb6fSKevin Wolf 5830865bb6fSKevin Wolf logout("will read %u bytes starting at offset %" PRIu64 "\n", 5840865bb6fSKevin Wolf n_bytes, offset); 5859aebd98aSStefan Weil 5869aebd98aSStefan Weil /* prepare next AIO request */ 5879aebd98aSStefan Weil bmap_entry = le32_to_cpu(s->bmap[block_index]); 588c794b4e0SEric Sunshine if (!VDI_IS_ALLOCATED(bmap_entry)) { 5899aebd98aSStefan Weil /* Block not allocated, return zeros, no need to wait. */ 5900865bb6fSKevin Wolf qemu_iovec_memset(qiov, bytes_done, 0, n_bytes); 5913d46a75aSPaolo Bonzini ret = 0; 5929aebd98aSStefan Weil } else { 5930865bb6fSKevin Wolf uint64_t data_offset = s->header.offset_data + 5940865bb6fSKevin Wolf (uint64_t)bmap_entry * s->block_size + 5950865bb6fSKevin Wolf offset_in_block; 5960c7bfc32SPaolo Bonzini 5970865bb6fSKevin Wolf qemu_iovec_reset(&local_qiov); 5980865bb6fSKevin Wolf qemu_iovec_concat(&local_qiov, qiov, bytes_done, n_bytes); 5990865bb6fSKevin Wolf 6000865bb6fSKevin Wolf ret = bdrv_co_preadv(bs->file->bs, data_offset, n_bytes, 6010865bb6fSKevin Wolf &local_qiov, 0); 6023d46a75aSPaolo Bonzini } 6030865bb6fSKevin Wolf logout("%u bytes read\n", n_bytes); 6040865bb6fSKevin Wolf 6050865bb6fSKevin Wolf bytes -= n_bytes; 6060865bb6fSKevin Wolf offset += n_bytes; 6070865bb6fSKevin Wolf bytes_done += n_bytes; 6080865bb6fSKevin Wolf } 6090865bb6fSKevin Wolf 6100865bb6fSKevin Wolf qemu_iovec_destroy(&local_qiov); 6113d46a75aSPaolo Bonzini 6123d46a75aSPaolo Bonzini return ret; 6139aebd98aSStefan Weil } 6149aebd98aSStefan Weil 615fde9d56fSKevin Wolf static int coroutine_fn 616fde9d56fSKevin Wolf vdi_co_pwritev(BlockDriverState *bs, uint64_t offset, uint64_t bytes, 617fde9d56fSKevin Wolf QEMUIOVector *qiov, int flags) 6189aebd98aSStefan Weil { 6199aebd98aSStefan Weil BDRVVdiState *s = bs->opaque; 620fde9d56fSKevin Wolf QEMUIOVector local_qiov; 6219aebd98aSStefan Weil uint32_t bmap_entry; 6229aebd98aSStefan Weil uint32_t block_index; 623fde9d56fSKevin Wolf uint32_t offset_in_block; 624fde9d56fSKevin Wolf uint32_t n_bytes; 625bfc45fc1SPaolo Bonzini uint32_t bmap_first = VDI_UNALLOCATED; 626bfc45fc1SPaolo Bonzini uint32_t bmap_last = VDI_UNALLOCATED; 627bfc45fc1SPaolo Bonzini uint8_t *block = NULL; 628fde9d56fSKevin Wolf uint64_t bytes_done = 0; 629eb9566d1SPaolo Bonzini int ret = 0; 6304de659e8SPaolo Bonzini 6314de659e8SPaolo Bonzini logout("\n"); 6329aebd98aSStefan Weil 633fde9d56fSKevin Wolf qemu_iovec_init(&local_qiov, qiov->niov); 6349aebd98aSStefan Weil 635fde9d56fSKevin Wolf while (ret >= 0 && bytes > 0) { 636fde9d56fSKevin Wolf block_index = offset / s->block_size; 637fde9d56fSKevin Wolf offset_in_block = offset % s->block_size; 638fde9d56fSKevin Wolf n_bytes = MIN(bytes, s->block_size - offset_in_block); 639fde9d56fSKevin Wolf 640fde9d56fSKevin Wolf logout("will write %u bytes starting at offset %" PRIu64 "\n", 641fde9d56fSKevin Wolf n_bytes, offset); 6429aebd98aSStefan Weil 6439aebd98aSStefan Weil /* prepare next AIO request */ 6449aebd98aSStefan Weil bmap_entry = le32_to_cpu(s->bmap[block_index]); 645c794b4e0SEric Sunshine if (!VDI_IS_ALLOCATED(bmap_entry)) { 6469aebd98aSStefan Weil /* Allocate new block and write to it. */ 647fde9d56fSKevin Wolf uint64_t data_offset; 6489aebd98aSStefan Weil bmap_entry = s->header.blocks_allocated; 6499aebd98aSStefan Weil s->bmap[block_index] = cpu_to_le32(bmap_entry); 6509aebd98aSStefan Weil s->header.blocks_allocated++; 651fde9d56fSKevin Wolf data_offset = s->header.offset_data + 652fde9d56fSKevin Wolf (uint64_t)bmap_entry * s->block_size; 6539aebd98aSStefan Weil if (block == NULL) { 654641543b7SStefan Weil block = g_malloc(s->block_size); 655bfc45fc1SPaolo Bonzini bmap_first = block_index; 6569aebd98aSStefan Weil } 657bfc45fc1SPaolo Bonzini bmap_last = block_index; 658641543b7SStefan Weil /* Copy data to be written to new block and zero unused parts. */ 659fde9d56fSKevin Wolf memset(block, 0, offset_in_block); 660fde9d56fSKevin Wolf qemu_iovec_to_buf(qiov, bytes_done, block + offset_in_block, 661fde9d56fSKevin Wolf n_bytes); 662fde9d56fSKevin Wolf memset(block + offset_in_block + n_bytes, 0, 663fde9d56fSKevin Wolf s->block_size - n_bytes - offset_in_block); 664f0ab6f10SMax Reitz 665f0ab6f10SMax Reitz /* Note that this coroutine does not yield anywhere from reading the 666f0ab6f10SMax Reitz * bmap entry until here, so in regards to all the coroutines trying 667f0ab6f10SMax Reitz * to write to this cluster, the one doing the allocation will 668f0ab6f10SMax Reitz * always be the first to try to acquire the lock. 669f0ab6f10SMax Reitz * Therefore, it is also the first that will actually be able to 670f0ab6f10SMax Reitz * acquire the lock and thus the padded cluster is written before 671f0ab6f10SMax Reitz * the other coroutines can write to the affected area. */ 672f0ab6f10SMax Reitz qemu_co_mutex_lock(&s->write_lock); 673fde9d56fSKevin Wolf ret = bdrv_pwrite(bs->file->bs, data_offset, block, s->block_size); 674f0ab6f10SMax Reitz qemu_co_mutex_unlock(&s->write_lock); 6759aebd98aSStefan Weil } else { 676fde9d56fSKevin Wolf uint64_t data_offset = s->header.offset_data + 677fde9d56fSKevin Wolf (uint64_t)bmap_entry * s->block_size + 678fde9d56fSKevin Wolf offset_in_block; 679f0ab6f10SMax Reitz qemu_co_mutex_lock(&s->write_lock); 680f0ab6f10SMax Reitz /* This lock is only used to make sure the following write operation 681f0ab6f10SMax Reitz * is executed after the write issued by the coroutine allocating 682f0ab6f10SMax Reitz * this cluster, therefore we do not need to keep it locked. 683f0ab6f10SMax Reitz * As stated above, the allocating coroutine will always try to lock 684f0ab6f10SMax Reitz * the mutex before all the other concurrent accesses to that 685f0ab6f10SMax Reitz * cluster, therefore at this point we can be absolutely certain 686f0ab6f10SMax Reitz * that that write operation has returned (there may be other writes 687f0ab6f10SMax Reitz * in flight, but they do not concern this very operation). */ 688f0ab6f10SMax Reitz qemu_co_mutex_unlock(&s->write_lock); 689fde9d56fSKevin Wolf 690fde9d56fSKevin Wolf qemu_iovec_reset(&local_qiov); 691fde9d56fSKevin Wolf qemu_iovec_concat(&local_qiov, qiov, bytes_done, n_bytes); 692fde9d56fSKevin Wolf 693fde9d56fSKevin Wolf ret = bdrv_co_pwritev(bs->file->bs, data_offset, n_bytes, 694fde9d56fSKevin Wolf &local_qiov, 0); 6959aebd98aSStefan Weil } 6960c7bfc32SPaolo Bonzini 697fde9d56fSKevin Wolf bytes -= n_bytes; 698fde9d56fSKevin Wolf offset += n_bytes; 699fde9d56fSKevin Wolf bytes_done += n_bytes; 7000c7bfc32SPaolo Bonzini 701fde9d56fSKevin Wolf logout("%u bytes written\n", n_bytes); 7023d46a75aSPaolo Bonzini } 7039aebd98aSStefan Weil 704fde9d56fSKevin Wolf qemu_iovec_destroy(&local_qiov); 705fde9d56fSKevin Wolf 7060c7bfc32SPaolo Bonzini logout("finished data write\n"); 7074eea78e6SPaolo Bonzini if (ret < 0) { 7084eea78e6SPaolo Bonzini return ret; 7094eea78e6SPaolo Bonzini } 7104eea78e6SPaolo Bonzini 711bfc45fc1SPaolo Bonzini if (block) { 7124eea78e6SPaolo Bonzini /* One or more new blocks were allocated. */ 713bfc45fc1SPaolo Bonzini VdiHeader *header = (VdiHeader *) block; 7144eea78e6SPaolo Bonzini uint8_t *base; 7154eea78e6SPaolo Bonzini uint64_t offset; 716fde9d56fSKevin Wolf uint32_t n_sectors; 7174eea78e6SPaolo Bonzini 7180c7bfc32SPaolo Bonzini logout("now writing modified header\n"); 719bfc45fc1SPaolo Bonzini assert(VDI_IS_ALLOCATED(bmap_first)); 7200c7bfc32SPaolo Bonzini *header = s->header; 7210c7bfc32SPaolo Bonzini vdi_header_to_le(header); 7229a4f4c31SKevin Wolf ret = bdrv_write(bs->file->bs, 0, block, 1); 723bfc45fc1SPaolo Bonzini g_free(block); 724bfc45fc1SPaolo Bonzini block = NULL; 7254eea78e6SPaolo Bonzini 7264eea78e6SPaolo Bonzini if (ret < 0) { 7274eea78e6SPaolo Bonzini return ret; 7284eea78e6SPaolo Bonzini } 7294eea78e6SPaolo Bonzini 7300c7bfc32SPaolo Bonzini logout("now writing modified block map entry %u...%u\n", 7310c7bfc32SPaolo Bonzini bmap_first, bmap_last); 7320c7bfc32SPaolo Bonzini /* Write modified sectors from block map. */ 7330c7bfc32SPaolo Bonzini bmap_first /= (SECTOR_SIZE / sizeof(uint32_t)); 7340c7bfc32SPaolo Bonzini bmap_last /= (SECTOR_SIZE / sizeof(uint32_t)); 7350c7bfc32SPaolo Bonzini n_sectors = bmap_last - bmap_first + 1; 7360c7bfc32SPaolo Bonzini offset = s->bmap_sector + bmap_first; 7374eea78e6SPaolo Bonzini base = ((uint8_t *)&s->bmap[0]) + bmap_first * SECTOR_SIZE; 7380c7bfc32SPaolo Bonzini logout("will write %u block map sectors starting from entry %u\n", 7390c7bfc32SPaolo Bonzini n_sectors, bmap_first); 7409a4f4c31SKevin Wolf ret = bdrv_write(bs->file->bs, offset, base, n_sectors); 7410c7bfc32SPaolo Bonzini } 7420c7bfc32SPaolo Bonzini 7433d46a75aSPaolo Bonzini return ret; 7449aebd98aSStefan Weil } 7459aebd98aSStefan Weil 746004b7f25SChunyan Liu static int vdi_create(const char *filename, QemuOpts *opts, Error **errp) 7479aebd98aSStefan Weil { 748dddc7750SJeff Cody int ret = 0; 7499aebd98aSStefan Weil uint64_t bytes = 0; 7509aebd98aSStefan Weil uint32_t blocks; 75199cce9faSKevin Wolf size_t block_size = DEFAULT_CLUSTER_SIZE; 7529aebd98aSStefan Weil uint32_t image_type = VDI_TYPE_DYNAMIC; 7539aebd98aSStefan Weil VdiHeader header; 7549aebd98aSStefan Weil size_t i; 7559aebd98aSStefan Weil size_t bmap_size; 75670747862SJeff Cody int64_t offset = 0; 75770747862SJeff Cody Error *local_err = NULL; 758a08f0c3bSKevin Wolf BlockBackend *blk = NULL; 75970747862SJeff Cody uint32_t *bmap = NULL; 7609aebd98aSStefan Weil 7619aebd98aSStefan Weil logout("\n"); 7629aebd98aSStefan Weil 7639aebd98aSStefan Weil /* Read out options. */ 764c2eb918eSHu Tao bytes = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0), 765c2eb918eSHu Tao BDRV_SECTOR_SIZE); 7669aebd98aSStefan Weil #if defined(CONFIG_VDI_BLOCK_SIZE) 7679aebd98aSStefan Weil /* TODO: Additional checks (SECTOR_SIZE * 2^n, ...). */ 768004b7f25SChunyan Liu block_size = qemu_opt_get_size_del(opts, 769004b7f25SChunyan Liu BLOCK_OPT_CLUSTER_SIZE, 770004b7f25SChunyan Liu DEFAULT_CLUSTER_SIZE); 7719aebd98aSStefan Weil #endif 7729aebd98aSStefan Weil #if defined(CONFIG_VDI_STATIC_IMAGE) 773004b7f25SChunyan Liu if (qemu_opt_get_bool_del(opts, BLOCK_OPT_STATIC, false)) { 7749aebd98aSStefan Weil image_type = VDI_TYPE_STATIC; 7756eea90ebSStefan Weil } 7769aebd98aSStefan Weil #endif 7779aebd98aSStefan Weil 77863fa06dcSJeff Cody if (bytes > VDI_DISK_SIZE_MAX) { 779dddc7750SJeff Cody ret = -ENOTSUP; 78063fa06dcSJeff Cody error_setg(errp, "Unsupported VDI image size (size is 0x%" PRIx64 78163fa06dcSJeff Cody ", max supported is 0x%" PRIx64 ")", 78263fa06dcSJeff Cody bytes, VDI_DISK_SIZE_MAX); 78363fa06dcSJeff Cody goto exit; 78463fa06dcSJeff Cody } 78563fa06dcSJeff Cody 786dddc7750SJeff Cody ret = bdrv_create_file(filename, opts, &local_err); 787dddc7750SJeff Cody if (ret < 0) { 78870747862SJeff Cody error_propagate(errp, local_err); 78963fa06dcSJeff Cody goto exit; 7909aebd98aSStefan Weil } 791a08f0c3bSKevin Wolf 792efaa7c4eSMax Reitz blk = blk_new_open(filename, NULL, NULL, 79372e775c7SKevin Wolf BDRV_O_RDWR | BDRV_O_PROTOCOL, &local_err); 794a08f0c3bSKevin Wolf if (blk == NULL) { 79570747862SJeff Cody error_propagate(errp, local_err); 796a08f0c3bSKevin Wolf ret = -EIO; 79770747862SJeff Cody goto exit; 7984ab15590SChunyan Liu } 7994ab15590SChunyan Liu 800a08f0c3bSKevin Wolf blk_set_allow_write_beyond_eof(blk, true); 801a08f0c3bSKevin Wolf 802f21dc3a4SStefan Weil /* We need enough blocks to store the given disk size, 803f21dc3a4SStefan Weil so always round up. */ 804e9082e47SMax Reitz blocks = DIV_ROUND_UP(bytes, block_size); 805f21dc3a4SStefan Weil 8069aebd98aSStefan Weil bmap_size = blocks * sizeof(uint32_t); 807e9082e47SMax Reitz bmap_size = ROUND_UP(bmap_size, SECTOR_SIZE); 8089aebd98aSStefan Weil 8099aebd98aSStefan Weil memset(&header, 0, sizeof(header)); 8101786dc15SBlue Swirl pstrcpy(header.text, sizeof(header.text), VDI_TEXT); 8119aebd98aSStefan Weil header.signature = VDI_SIGNATURE; 8129aebd98aSStefan Weil header.version = VDI_VERSION_1_1; 8139aebd98aSStefan Weil header.header_size = 0x180; 8149aebd98aSStefan Weil header.image_type = image_type; 8159aebd98aSStefan Weil header.offset_bmap = 0x200; 8169aebd98aSStefan Weil header.offset_data = 0x200 + bmap_size; 8179aebd98aSStefan Weil header.sector_size = SECTOR_SIZE; 8189aebd98aSStefan Weil header.disk_size = bytes; 8199aebd98aSStefan Weil header.block_size = block_size; 8209aebd98aSStefan Weil header.blocks_in_image = blocks; 8216eea90ebSStefan Weil if (image_type == VDI_TYPE_STATIC) { 8226eea90ebSStefan Weil header.blocks_allocated = blocks; 8236eea90ebSStefan Weil } 8249aebd98aSStefan Weil uuid_generate(header.uuid_image); 8259aebd98aSStefan Weil uuid_generate(header.uuid_last_snap); 8269aebd98aSStefan Weil /* There is no need to set header.uuid_link or header.uuid_parent here. */ 8279aebd98aSStefan Weil #if defined(CONFIG_VDI_DEBUG) 8289aebd98aSStefan Weil vdi_header_print(&header); 8299aebd98aSStefan Weil #endif 8309aebd98aSStefan Weil vdi_header_to_le(&header); 8318341f00dSEric Blake ret = blk_pwrite(blk, offset, &header, sizeof(header), 0); 832dddc7750SJeff Cody if (ret < 0) { 83370747862SJeff Cody error_setg(errp, "Error writing header to %s", filename); 83470747862SJeff Cody goto exit; 8359aebd98aSStefan Weil } 83670747862SJeff Cody offset += sizeof(header); 8379aebd98aSStefan Weil 838b76b6e95SStefan Weil if (bmap_size > 0) { 83917cce735SKevin Wolf bmap = g_try_malloc0(bmap_size); 84017cce735SKevin Wolf if (bmap == NULL) { 84117cce735SKevin Wolf ret = -ENOMEM; 84217cce735SKevin Wolf error_setg(errp, "Could not allocate bmap"); 84317cce735SKevin Wolf goto exit; 84417cce735SKevin Wolf } 8459aebd98aSStefan Weil for (i = 0; i < blocks; i++) { 8469aebd98aSStefan Weil if (image_type == VDI_TYPE_STATIC) { 8479aebd98aSStefan Weil bmap[i] = i; 8489aebd98aSStefan Weil } else { 8499aebd98aSStefan Weil bmap[i] = VDI_UNALLOCATED; 8509aebd98aSStefan Weil } 8519aebd98aSStefan Weil } 8528341f00dSEric Blake ret = blk_pwrite(blk, offset, bmap, bmap_size, 0); 853dddc7750SJeff Cody if (ret < 0) { 85470747862SJeff Cody error_setg(errp, "Error writing bmap to %s", filename); 85570747862SJeff Cody goto exit; 8569aebd98aSStefan Weil } 85770747862SJeff Cody offset += bmap_size; 858514f21a5SStefan Weil } 859514f21a5SStefan Weil 8609aebd98aSStefan Weil if (image_type == VDI_TYPE_STATIC) { 861a08f0c3bSKevin Wolf ret = blk_truncate(blk, offset + blocks * block_size); 862dddc7750SJeff Cody if (ret < 0) { 86370747862SJeff Cody error_setg(errp, "Failed to statically allocate %s", filename); 86470747862SJeff Cody goto exit; 8659aebd98aSStefan Weil } 8669aebd98aSStefan Weil } 8679aebd98aSStefan Weil 86863fa06dcSJeff Cody exit: 869a08f0c3bSKevin Wolf blk_unref(blk); 87070747862SJeff Cody g_free(bmap); 871dddc7750SJeff Cody return ret; 8729aebd98aSStefan Weil } 8739aebd98aSStefan Weil 8749aebd98aSStefan Weil static void vdi_close(BlockDriverState *bs) 8759aebd98aSStefan Weil { 876fc9d106cSKevin Wolf BDRVVdiState *s = bs->opaque; 8776ac5f388SKevin Wolf 87817cce735SKevin Wolf qemu_vfree(s->bmap); 8796ac5f388SKevin Wolf 880fc9d106cSKevin Wolf migrate_del_blocker(s->migration_blocker); 881fc9d106cSKevin Wolf error_free(s->migration_blocker); 8829aebd98aSStefan Weil } 8839aebd98aSStefan Weil 884004b7f25SChunyan Liu static QemuOptsList vdi_create_opts = { 885004b7f25SChunyan Liu .name = "vdi-create-opts", 886004b7f25SChunyan Liu .head = QTAILQ_HEAD_INITIALIZER(vdi_create_opts.head), 887004b7f25SChunyan Liu .desc = { 8889aebd98aSStefan Weil { 8899aebd98aSStefan Weil .name = BLOCK_OPT_SIZE, 890004b7f25SChunyan Liu .type = QEMU_OPT_SIZE, 8919aebd98aSStefan Weil .help = "Virtual disk size" 8929aebd98aSStefan Weil }, 8939aebd98aSStefan Weil #if defined(CONFIG_VDI_BLOCK_SIZE) 8949aebd98aSStefan Weil { 8959aebd98aSStefan Weil .name = BLOCK_OPT_CLUSTER_SIZE, 896004b7f25SChunyan Liu .type = QEMU_OPT_SIZE, 89799cce9faSKevin Wolf .help = "VDI cluster (block) size", 898004b7f25SChunyan Liu .def_value_str = stringify(DEFAULT_CLUSTER_SIZE) 8999aebd98aSStefan Weil }, 9009aebd98aSStefan Weil #endif 9019aebd98aSStefan Weil #if defined(CONFIG_VDI_STATIC_IMAGE) 9029aebd98aSStefan Weil { 9039aebd98aSStefan Weil .name = BLOCK_OPT_STATIC, 904004b7f25SChunyan Liu .type = QEMU_OPT_BOOL, 905004b7f25SChunyan Liu .help = "VDI static (pre-allocated) image", 906004b7f25SChunyan Liu .def_value_str = "off" 9079aebd98aSStefan Weil }, 9089aebd98aSStefan Weil #endif 9099aebd98aSStefan Weil /* TODO: An additional option to set UUID values might be useful. */ 910004b7f25SChunyan Liu { /* end of list */ } 911004b7f25SChunyan Liu } 9129aebd98aSStefan Weil }; 9139aebd98aSStefan Weil 9149aebd98aSStefan Weil static BlockDriver bdrv_vdi = { 9159aebd98aSStefan Weil .format_name = "vdi", 9169aebd98aSStefan Weil .instance_size = sizeof(BDRVVdiState), 9179aebd98aSStefan Weil .bdrv_probe = vdi_probe, 9189aebd98aSStefan Weil .bdrv_open = vdi_open, 9199aebd98aSStefan Weil .bdrv_close = vdi_close, 920ecfe2bbaSJeff Cody .bdrv_reopen_prepare = vdi_reopen_prepare, 921c282e1fdSChunyan Liu .bdrv_create = vdi_create, 9223ac21627SPeter Lieven .bdrv_has_zero_init = bdrv_has_zero_init_1, 923b6b8a333SPaolo Bonzini .bdrv_co_get_block_status = vdi_co_get_block_status, 9249aebd98aSStefan Weil .bdrv_make_empty = vdi_make_empty, 9259aebd98aSStefan Weil 9260865bb6fSKevin Wolf .bdrv_co_preadv = vdi_co_preadv, 9279aebd98aSStefan Weil #if defined(CONFIG_VDI_WRITE) 928fde9d56fSKevin Wolf .bdrv_co_pwritev = vdi_co_pwritev, 9299aebd98aSStefan Weil #endif 9309aebd98aSStefan Weil 9319aebd98aSStefan Weil .bdrv_get_info = vdi_get_info, 9329aebd98aSStefan Weil 933004b7f25SChunyan Liu .create_opts = &vdi_create_opts, 9349aebd98aSStefan Weil .bdrv_check = vdi_check, 9359aebd98aSStefan Weil }; 9369aebd98aSStefan Weil 9379aebd98aSStefan Weil static void bdrv_vdi_init(void) 9389aebd98aSStefan Weil { 9399aebd98aSStefan Weil logout("\n"); 9409aebd98aSStefan Weil bdrv_register(&bdrv_vdi); 9419aebd98aSStefan Weil } 9429aebd98aSStefan Weil 9439aebd98aSStefan Weil block_init(bdrv_vdi_init); 944