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" 53f043568fSPhilippe Mathieu-Daudé #include "qemu/units.h" 54da34e65cSMarkus Armbruster #include "qapi/error.h" 5549858b50SMax Reitz #include "qapi/qobject-input-visitor.h" 5649858b50SMax Reitz #include "qapi/qapi-visit-block-core.h" 57737e150eSPaolo Bonzini #include "block/block_int.h" 58f853465aSMarkus Armbruster #include "block/qdict.h" 59a08f0c3bSKevin Wolf #include "sysemu/block-backend.h" 601de7afc9SPaolo Bonzini #include "qemu/module.h" 61922a01a0SMarkus Armbruster #include "qemu/option.h" 6258369e22SPaolo Bonzini #include "qemu/bswap.h" 63795c40b8SJuan Quintela #include "migration/blocker.h" 6410817bf0SDaniel P. Berrange #include "qemu/coroutine.h" 65f348b6d1SVeronia Bahaa #include "qemu/cutils.h" 667c6f55b6SFam Zheng #include "qemu/uuid.h" 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 SECTOR_SIZE 512 883dd5b8f4SLeonid Bloch #define DEFAULT_CLUSTER_SIZE S_1MiB 899aebd98aSStefan Weil 909aebd98aSStefan Weil #if defined(CONFIG_VDI_DEBUG) 91b80666bfSEric Blake #define VDI_DEBUG 1 929aebd98aSStefan Weil #else 93b80666bfSEric Blake #define VDI_DEBUG 0 949aebd98aSStefan Weil #endif 959aebd98aSStefan Weil 96b80666bfSEric Blake #define logout(fmt, ...) \ 97b80666bfSEric Blake do { \ 98b80666bfSEric Blake if (VDI_DEBUG) { \ 99b80666bfSEric Blake fprintf(stderr, "vdi\t%-24s" fmt, __func__, ##__VA_ARGS__); \ 100b80666bfSEric Blake } \ 101b80666bfSEric Blake } while (0) 102b80666bfSEric Blake 1039aebd98aSStefan Weil /* Image signature. */ 1049aebd98aSStefan Weil #define VDI_SIGNATURE 0xbeda107f 1059aebd98aSStefan Weil 1069aebd98aSStefan Weil /* Image version. */ 1079aebd98aSStefan Weil #define VDI_VERSION_1_1 0x00010001 1089aebd98aSStefan Weil 1099aebd98aSStefan Weil /* Image type. */ 1109aebd98aSStefan Weil #define VDI_TYPE_DYNAMIC 1 1119aebd98aSStefan Weil #define VDI_TYPE_STATIC 2 1129aebd98aSStefan Weil 1139aebd98aSStefan Weil /* Innotek / SUN images use these strings in header.text: 1149aebd98aSStefan Weil * "<<< innotek VirtualBox Disk Image >>>\n" 1159aebd98aSStefan Weil * "<<< Sun xVM VirtualBox Disk Image >>>\n" 1169aebd98aSStefan Weil * "<<< Sun VirtualBox Disk Image >>>\n" 1179aebd98aSStefan Weil * The value does not matter, so QEMU created images use a different text. 1189aebd98aSStefan Weil */ 1199aebd98aSStefan Weil #define VDI_TEXT "<<< QEMU VM Virtual Disk Image >>>\n" 1209aebd98aSStefan Weil 121c794b4e0SEric Sunshine /* A never-allocated block; semantically arbitrary content. */ 122c794b4e0SEric Sunshine #define VDI_UNALLOCATED 0xffffffffU 123c794b4e0SEric Sunshine 124c794b4e0SEric Sunshine /* A discarded (no longer allocated) block; semantically zero-filled. */ 125c794b4e0SEric Sunshine #define VDI_DISCARDED 0xfffffffeU 126c794b4e0SEric Sunshine 127c794b4e0SEric Sunshine #define VDI_IS_ALLOCATED(X) ((X) < VDI_DISCARDED) 1289aebd98aSStefan Weil 129d20418eeSMax Reitz /* The bmap will take up VDI_BLOCKS_IN_IMAGE_MAX * sizeof(uint32_t) bytes; since 130d20418eeSMax Reitz * the bmap is read and written in a single operation, its size needs to be 131d20418eeSMax Reitz * limited to INT_MAX; furthermore, when opening an image, the bmap size is 132d20418eeSMax Reitz * rounded up to be aligned on BDRV_SECTOR_SIZE. 133d20418eeSMax Reitz * Therefore this should satisfy the following: 134d20418eeSMax Reitz * VDI_BLOCKS_IN_IMAGE_MAX * sizeof(uint32_t) + BDRV_SECTOR_SIZE == INT_MAX + 1 135d20418eeSMax Reitz * (INT_MAX + 1 is the first value not representable as an int) 136d20418eeSMax Reitz * This guarantees that any value below or equal to the constant will, when 137d20418eeSMax Reitz * multiplied by sizeof(uint32_t) and rounded up to a BDRV_SECTOR_SIZE boundary, 138d20418eeSMax Reitz * still be below or equal to INT_MAX. */ 139d20418eeSMax Reitz #define VDI_BLOCKS_IN_IMAGE_MAX \ 140d20418eeSMax Reitz ((unsigned)((INT_MAX + 1u - BDRV_SECTOR_SIZE) / sizeof(uint32_t))) 14163fa06dcSJeff Cody #define VDI_DISK_SIZE_MAX ((uint64_t)VDI_BLOCKS_IN_IMAGE_MAX * \ 14263fa06dcSJeff Cody (uint64_t)DEFAULT_CLUSTER_SIZE) 14363fa06dcSJeff Cody 14449858b50SMax Reitz static QemuOptsList vdi_create_opts; 14549858b50SMax Reitz 1469aebd98aSStefan Weil typedef struct { 1479aebd98aSStefan Weil char text[0x40]; 1489aebd98aSStefan Weil uint32_t signature; 1499aebd98aSStefan Weil uint32_t version; 1509aebd98aSStefan Weil uint32_t header_size; 1519aebd98aSStefan Weil uint32_t image_type; 1529aebd98aSStefan Weil uint32_t image_flags; 1539aebd98aSStefan Weil char description[256]; 1549aebd98aSStefan Weil uint32_t offset_bmap; 1559aebd98aSStefan Weil uint32_t offset_data; 1569aebd98aSStefan Weil uint32_t cylinders; /* disk geometry, unused here */ 1579aebd98aSStefan Weil uint32_t heads; /* disk geometry, unused here */ 1589aebd98aSStefan Weil uint32_t sectors; /* disk geometry, unused here */ 1599aebd98aSStefan Weil uint32_t sector_size; 1609aebd98aSStefan Weil uint32_t unused1; 1619aebd98aSStefan Weil uint64_t disk_size; 1629aebd98aSStefan Weil uint32_t block_size; 1639aebd98aSStefan Weil uint32_t block_extra; /* unused here */ 1649aebd98aSStefan Weil uint32_t blocks_in_image; 1659aebd98aSStefan Weil uint32_t blocks_allocated; 1667c6f55b6SFam Zheng QemuUUID uuid_image; 1677c6f55b6SFam Zheng QemuUUID uuid_last_snap; 1687c6f55b6SFam Zheng QemuUUID uuid_link; 1697c6f55b6SFam Zheng QemuUUID uuid_parent; 1709aebd98aSStefan Weil uint64_t unused2[7]; 1718368febdSJeff Cody } QEMU_PACKED VdiHeader; 1729aebd98aSStefan Weil 1739aebd98aSStefan Weil typedef struct { 1749aebd98aSStefan Weil /* The block map entries are little endian (even in memory). */ 1759aebd98aSStefan Weil uint32_t *bmap; 1769aebd98aSStefan Weil /* Size of block (bytes). */ 1779aebd98aSStefan Weil uint32_t block_size; 1789aebd98aSStefan Weil /* First sector of block map. */ 1799aebd98aSStefan Weil uint32_t bmap_sector; 1804ff9786cSStefan Weil /* VDI header (converted to host endianness). */ 1819aebd98aSStefan Weil VdiHeader header; 182fc9d106cSKevin Wolf 1831e886639SPaolo Bonzini CoRwlock bmap_lock; 184f0ab6f10SMax Reitz 185fc9d106cSKevin Wolf Error *migration_blocker; 1869aebd98aSStefan Weil } BDRVVdiState; 1879aebd98aSStefan Weil 1889aebd98aSStefan Weil static void vdi_header_to_cpu(VdiHeader *header) 1899aebd98aSStefan Weil { 19009190184SPeter Maydell header->signature = le32_to_cpu(header->signature); 19109190184SPeter Maydell header->version = le32_to_cpu(header->version); 19209190184SPeter Maydell header->header_size = le32_to_cpu(header->header_size); 19309190184SPeter Maydell header->image_type = le32_to_cpu(header->image_type); 19409190184SPeter Maydell header->image_flags = le32_to_cpu(header->image_flags); 19509190184SPeter Maydell header->offset_bmap = le32_to_cpu(header->offset_bmap); 19609190184SPeter Maydell header->offset_data = le32_to_cpu(header->offset_data); 19709190184SPeter Maydell header->cylinders = le32_to_cpu(header->cylinders); 19809190184SPeter Maydell header->heads = le32_to_cpu(header->heads); 19909190184SPeter Maydell header->sectors = le32_to_cpu(header->sectors); 20009190184SPeter Maydell header->sector_size = le32_to_cpu(header->sector_size); 20109190184SPeter Maydell header->disk_size = le64_to_cpu(header->disk_size); 20209190184SPeter Maydell header->block_size = le32_to_cpu(header->block_size); 20309190184SPeter Maydell header->block_extra = le32_to_cpu(header->block_extra); 20409190184SPeter Maydell header->blocks_in_image = le32_to_cpu(header->blocks_in_image); 20509190184SPeter Maydell header->blocks_allocated = le32_to_cpu(header->blocks_allocated); 206*1324f063SPeter Maydell header->uuid_image = qemu_uuid_bswap(header->uuid_image); 207*1324f063SPeter Maydell header->uuid_last_snap = qemu_uuid_bswap(header->uuid_last_snap); 208*1324f063SPeter Maydell header->uuid_link = qemu_uuid_bswap(header->uuid_link); 209*1324f063SPeter Maydell header->uuid_parent = qemu_uuid_bswap(header->uuid_parent); 2109aebd98aSStefan Weil } 2119aebd98aSStefan Weil 2129aebd98aSStefan Weil static void vdi_header_to_le(VdiHeader *header) 2139aebd98aSStefan Weil { 21409190184SPeter Maydell header->signature = cpu_to_le32(header->signature); 21509190184SPeter Maydell header->version = cpu_to_le32(header->version); 21609190184SPeter Maydell header->header_size = cpu_to_le32(header->header_size); 21709190184SPeter Maydell header->image_type = cpu_to_le32(header->image_type); 21809190184SPeter Maydell header->image_flags = cpu_to_le32(header->image_flags); 21909190184SPeter Maydell header->offset_bmap = cpu_to_le32(header->offset_bmap); 22009190184SPeter Maydell header->offset_data = cpu_to_le32(header->offset_data); 22109190184SPeter Maydell header->cylinders = cpu_to_le32(header->cylinders); 22209190184SPeter Maydell header->heads = cpu_to_le32(header->heads); 22309190184SPeter Maydell header->sectors = cpu_to_le32(header->sectors); 22409190184SPeter Maydell header->sector_size = cpu_to_le32(header->sector_size); 22509190184SPeter Maydell header->disk_size = cpu_to_le64(header->disk_size); 22609190184SPeter Maydell header->block_size = cpu_to_le32(header->block_size); 22709190184SPeter Maydell header->block_extra = cpu_to_le32(header->block_extra); 22809190184SPeter Maydell header->blocks_in_image = cpu_to_le32(header->blocks_in_image); 22909190184SPeter Maydell header->blocks_allocated = cpu_to_le32(header->blocks_allocated); 230*1324f063SPeter Maydell header->uuid_image = qemu_uuid_bswap(header->uuid_image); 231*1324f063SPeter Maydell header->uuid_last_snap = qemu_uuid_bswap(header->uuid_last_snap); 232*1324f063SPeter Maydell header->uuid_link = qemu_uuid_bswap(header->uuid_link); 233*1324f063SPeter Maydell header->uuid_parent = qemu_uuid_bswap(header->uuid_parent); 2349aebd98aSStefan Weil } 2359aebd98aSStefan Weil 2369aebd98aSStefan Weil static void vdi_header_print(VdiHeader *header) 2379aebd98aSStefan Weil { 238ac928b8eSPeter Maydell char uuidstr[37]; 239ac928b8eSPeter Maydell QemuUUID uuid; 2409aebd98aSStefan Weil logout("text %s", header->text); 2419f0470bbSStefan Weil logout("signature 0x%08x\n", header->signature); 2429aebd98aSStefan Weil logout("header size 0x%04x\n", header->header_size); 2439aebd98aSStefan Weil logout("image type 0x%04x\n", header->image_type); 2449aebd98aSStefan Weil logout("image flags 0x%04x\n", header->image_flags); 2459aebd98aSStefan Weil logout("description %s\n", header->description); 2469aebd98aSStefan Weil logout("offset bmap 0x%04x\n", header->offset_bmap); 2479aebd98aSStefan Weil logout("offset data 0x%04x\n", header->offset_data); 2489aebd98aSStefan Weil logout("cylinders 0x%04x\n", header->cylinders); 2499aebd98aSStefan Weil logout("heads 0x%04x\n", header->heads); 2509aebd98aSStefan Weil logout("sectors 0x%04x\n", header->sectors); 2519aebd98aSStefan Weil logout("sector size 0x%04x\n", header->sector_size); 2529aebd98aSStefan Weil logout("image size 0x%" PRIx64 " B (%" PRIu64 " MiB)\n", 2539aebd98aSStefan Weil header->disk_size, header->disk_size / MiB); 2549aebd98aSStefan Weil logout("block size 0x%04x\n", header->block_size); 2559aebd98aSStefan Weil logout("block extra 0x%04x\n", header->block_extra); 2569aebd98aSStefan Weil logout("blocks tot. 0x%04x\n", header->blocks_in_image); 2579aebd98aSStefan Weil logout("blocks all. 0x%04x\n", header->blocks_allocated); 258ac928b8eSPeter Maydell uuid = header->uuid_image; 259ac928b8eSPeter Maydell qemu_uuid_unparse(&uuid, uuidstr); 260ac928b8eSPeter Maydell logout("uuid image %s\n", uuidstr); 261ac928b8eSPeter Maydell uuid = header->uuid_last_snap; 262ac928b8eSPeter Maydell qemu_uuid_unparse(&uuid, uuidstr); 263ac928b8eSPeter Maydell logout("uuid snap %s\n", uuidstr); 264ac928b8eSPeter Maydell uuid = header->uuid_link; 265ac928b8eSPeter Maydell qemu_uuid_unparse(&uuid, uuidstr); 266ac928b8eSPeter Maydell logout("uuid link %s\n", uuidstr); 267ac928b8eSPeter Maydell uuid = header->uuid_parent; 268ac928b8eSPeter Maydell qemu_uuid_unparse(&uuid, uuidstr); 269ac928b8eSPeter Maydell logout("uuid parent %s\n", uuidstr); 2709aebd98aSStefan Weil } 2719aebd98aSStefan Weil 2722fd61638SPaolo Bonzini static int coroutine_fn vdi_co_check(BlockDriverState *bs, BdrvCheckResult *res, 2734534ff54SKevin Wolf BdrvCheckMode fix) 2749aebd98aSStefan Weil { 2759aebd98aSStefan Weil /* TODO: additional checks possible. */ 2769aebd98aSStefan Weil BDRVVdiState *s = (BDRVVdiState *)bs->opaque; 2779aebd98aSStefan Weil uint32_t blocks_allocated = 0; 2789aebd98aSStefan Weil uint32_t block; 2799aebd98aSStefan Weil uint32_t *bmap; 2809aebd98aSStefan Weil logout("\n"); 2819aebd98aSStefan Weil 2824534ff54SKevin Wolf if (fix) { 2834534ff54SKevin Wolf return -ENOTSUP; 2844534ff54SKevin Wolf } 2854534ff54SKevin Wolf 2865839e53bSMarkus Armbruster bmap = g_try_new(uint32_t, s->header.blocks_in_image); 28717cce735SKevin Wolf if (s->header.blocks_in_image && bmap == NULL) { 28817cce735SKevin Wolf res->check_errors++; 28917cce735SKevin Wolf return -ENOMEM; 29017cce735SKevin Wolf } 29117cce735SKevin Wolf 2929aebd98aSStefan Weil memset(bmap, 0xff, s->header.blocks_in_image * sizeof(uint32_t)); 2939aebd98aSStefan Weil 2949aebd98aSStefan Weil /* Check block map and value of blocks_allocated. */ 2959aebd98aSStefan Weil for (block = 0; block < s->header.blocks_in_image; block++) { 2969aebd98aSStefan Weil uint32_t bmap_entry = le32_to_cpu(s->bmap[block]); 297c794b4e0SEric Sunshine if (VDI_IS_ALLOCATED(bmap_entry)) { 2989aebd98aSStefan Weil if (bmap_entry < s->header.blocks_in_image) { 2999aebd98aSStefan Weil blocks_allocated++; 300c794b4e0SEric Sunshine if (!VDI_IS_ALLOCATED(bmap[bmap_entry])) { 3019aebd98aSStefan Weil bmap[bmap_entry] = bmap_entry; 3029aebd98aSStefan Weil } else { 3039aebd98aSStefan Weil fprintf(stderr, "ERROR: block index %" PRIu32 3049aebd98aSStefan Weil " also used by %" PRIu32 "\n", bmap[bmap_entry], bmap_entry); 3059ac228e0SKevin Wolf res->corruptions++; 3069aebd98aSStefan Weil } 3079aebd98aSStefan Weil } else { 3089aebd98aSStefan Weil fprintf(stderr, "ERROR: block index %" PRIu32 3099aebd98aSStefan Weil " too large, is %" PRIu32 "\n", block, bmap_entry); 3109ac228e0SKevin Wolf res->corruptions++; 3119aebd98aSStefan Weil } 3129aebd98aSStefan Weil } 3139aebd98aSStefan Weil } 3149aebd98aSStefan Weil if (blocks_allocated != s->header.blocks_allocated) { 3159aebd98aSStefan Weil fprintf(stderr, "ERROR: allocated blocks mismatch, is %" PRIu32 3169aebd98aSStefan Weil ", should be %" PRIu32 "\n", 3179aebd98aSStefan Weil blocks_allocated, s->header.blocks_allocated); 3189ac228e0SKevin Wolf res->corruptions++; 3199aebd98aSStefan Weil } 3209aebd98aSStefan Weil 3217267c094SAnthony Liguori g_free(bmap); 3229aebd98aSStefan Weil 3239ac228e0SKevin Wolf return 0; 3249aebd98aSStefan Weil } 3259aebd98aSStefan Weil 3269aebd98aSStefan Weil static int vdi_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) 3279aebd98aSStefan Weil { 3289aebd98aSStefan Weil /* TODO: vdi_get_info would be needed for machine snapshots. 3299aebd98aSStefan Weil vm_state_offset is still missing. */ 3309aebd98aSStefan Weil BDRVVdiState *s = (BDRVVdiState *)bs->opaque; 3319aebd98aSStefan Weil logout("\n"); 3329aebd98aSStefan Weil bdi->cluster_size = s->block_size; 3339aebd98aSStefan Weil bdi->vm_state_offset = 0; 33495de6d70SPaolo Bonzini bdi->unallocated_blocks_are_zero = true; 3359aebd98aSStefan Weil return 0; 3369aebd98aSStefan Weil } 3379aebd98aSStefan Weil 3389aebd98aSStefan Weil static int vdi_make_empty(BlockDriverState *bs) 3399aebd98aSStefan Weil { 3409aebd98aSStefan Weil /* TODO: missing code. */ 3419aebd98aSStefan Weil logout("\n"); 3429aebd98aSStefan Weil /* The return value for missing code must be 0, see block.c. */ 3439aebd98aSStefan Weil return 0; 3449aebd98aSStefan Weil } 3459aebd98aSStefan Weil 3469aebd98aSStefan Weil static int vdi_probe(const uint8_t *buf, int buf_size, const char *filename) 3479aebd98aSStefan Weil { 3489aebd98aSStefan Weil const VdiHeader *header = (const VdiHeader *)buf; 349dddc7750SJeff Cody int ret = 0; 3509aebd98aSStefan Weil 3519aebd98aSStefan Weil logout("\n"); 3529aebd98aSStefan Weil 3539aebd98aSStefan Weil if (buf_size < sizeof(*header)) { 3549aebd98aSStefan Weil /* Header too small, no VDI. */ 3559aebd98aSStefan Weil } else if (le32_to_cpu(header->signature) == VDI_SIGNATURE) { 356dddc7750SJeff Cody ret = 100; 3579aebd98aSStefan Weil } 3589aebd98aSStefan Weil 359dddc7750SJeff Cody if (ret == 0) { 3609aebd98aSStefan Weil logout("no vdi image\n"); 3619aebd98aSStefan Weil } else { 3629aebd98aSStefan Weil logout("%s", header->text); 3639aebd98aSStefan Weil } 3649aebd98aSStefan Weil 365dddc7750SJeff Cody return ret; 3669aebd98aSStefan Weil } 3679aebd98aSStefan Weil 368015a1036SMax Reitz static int vdi_open(BlockDriverState *bs, QDict *options, int flags, 369015a1036SMax Reitz Error **errp) 3709aebd98aSStefan Weil { 3719aebd98aSStefan Weil BDRVVdiState *s = bs->opaque; 3729aebd98aSStefan Weil VdiHeader header; 3739aebd98aSStefan Weil size_t bmap_size; 3748937f822SStefan Weil int ret; 375fe44dc91SAshijeet Acharya Error *local_err = NULL; 376ac928b8eSPeter Maydell QemuUUID uuid_link, uuid_parent; 3779aebd98aSStefan Weil 3784e4bf5c4SKevin Wolf bs->file = bdrv_open_child(NULL, options, "file", bs, &child_file, 3794e4bf5c4SKevin Wolf false, errp); 3804e4bf5c4SKevin Wolf if (!bs->file) { 3814e4bf5c4SKevin Wolf return -EINVAL; 3824e4bf5c4SKevin Wolf } 3834e4bf5c4SKevin Wolf 3849aebd98aSStefan Weil logout("\n"); 3859aebd98aSStefan Weil 386fbcbbf4eSKevin Wolf ret = bdrv_read(bs->file, 0, (uint8_t *)&header, 1); 3878937f822SStefan Weil if (ret < 0) { 3889aebd98aSStefan Weil goto fail; 3899aebd98aSStefan Weil } 3909aebd98aSStefan Weil 3919aebd98aSStefan Weil vdi_header_to_cpu(&header); 39295a14d51SKevin Wolf if (VDI_DEBUG) { 3939aebd98aSStefan Weil vdi_header_print(&header); 39495a14d51SKevin Wolf } 3959aebd98aSStefan Weil 39663fa06dcSJeff Cody if (header.disk_size > VDI_DISK_SIZE_MAX) { 39763fa06dcSJeff Cody error_setg(errp, "Unsupported VDI image size (size is 0x%" PRIx64 39863fa06dcSJeff Cody ", max supported is 0x%" PRIx64 ")", 39963fa06dcSJeff Cody header.disk_size, VDI_DISK_SIZE_MAX); 40063fa06dcSJeff Cody ret = -ENOTSUP; 40163fa06dcSJeff Cody goto fail; 40263fa06dcSJeff Cody } 40363fa06dcSJeff Cody 404ac928b8eSPeter Maydell uuid_link = header.uuid_link; 405ac928b8eSPeter Maydell uuid_parent = header.uuid_parent; 406ac928b8eSPeter Maydell 407f21dc3a4SStefan Weil if (header.disk_size % SECTOR_SIZE != 0) { 408f21dc3a4SStefan Weil /* 'VBoxManage convertfromraw' can create images with odd disk sizes. 409f21dc3a4SStefan Weil We accept them but round the disk size to the next multiple of 410f21dc3a4SStefan Weil SECTOR_SIZE. */ 411f21dc3a4SStefan Weil logout("odd disk size %" PRIu64 " B, round up\n", header.disk_size); 412e9082e47SMax Reitz header.disk_size = ROUND_UP(header.disk_size, SECTOR_SIZE); 413f21dc3a4SStefan Weil } 414f21dc3a4SStefan Weil 4150e87ba2cSStefan Weil if (header.signature != VDI_SIGNATURE) { 416521b2b5dSMax Reitz error_setg(errp, "Image not in VDI format (bad signature %08" PRIx32 417521b2b5dSMax Reitz ")", header.signature); 41876abe407SPaolo Bonzini ret = -EINVAL; 4190e87ba2cSStefan Weil goto fail; 4200e87ba2cSStefan Weil } else if (header.version != VDI_VERSION_1_1) { 421521b2b5dSMax Reitz error_setg(errp, "unsupported VDI image (version %" PRIu32 ".%" PRIu32 422521b2b5dSMax Reitz ")", header.version >> 16, header.version & 0xffff); 4238937f822SStefan Weil ret = -ENOTSUP; 4249aebd98aSStefan Weil goto fail; 4259aebd98aSStefan Weil } else if (header.offset_bmap % SECTOR_SIZE != 0) { 4269aebd98aSStefan Weil /* We only support block maps which start on a sector boundary. */ 4275b7aa9b5SPaolo Bonzini error_setg(errp, "unsupported VDI image (unaligned block map offset " 428521b2b5dSMax Reitz "0x%" PRIx32 ")", header.offset_bmap); 4298937f822SStefan Weil ret = -ENOTSUP; 4309aebd98aSStefan Weil goto fail; 4319aebd98aSStefan Weil } else if (header.offset_data % SECTOR_SIZE != 0) { 4329aebd98aSStefan Weil /* We only support data blocks which start on a sector boundary. */ 433521b2b5dSMax Reitz error_setg(errp, "unsupported VDI image (unaligned data offset 0x%" 434521b2b5dSMax Reitz PRIx32 ")", header.offset_data); 4358937f822SStefan Weil ret = -ENOTSUP; 4369aebd98aSStefan Weil goto fail; 4379aebd98aSStefan Weil } else if (header.sector_size != SECTOR_SIZE) { 438521b2b5dSMax Reitz error_setg(errp, "unsupported VDI image (sector size %" PRIu32 439521b2b5dSMax Reitz " is not %u)", header.sector_size, SECTOR_SIZE); 4408937f822SStefan Weil ret = -ENOTSUP; 4419aebd98aSStefan Weil goto fail; 44263fa06dcSJeff Cody } else if (header.block_size != DEFAULT_CLUSTER_SIZE) { 443521b2b5dSMax Reitz error_setg(errp, "unsupported VDI image (block size %" PRIu32 4443dd5b8f4SLeonid Bloch " is not %" PRIu32 ")", 445f043568fSPhilippe Mathieu-Daudé header.block_size, DEFAULT_CLUSTER_SIZE); 4468937f822SStefan Weil ret = -ENOTSUP; 4479aebd98aSStefan Weil goto fail; 448f21dc3a4SStefan Weil } else if (header.disk_size > 449f21dc3a4SStefan Weil (uint64_t)header.blocks_in_image * header.block_size) { 4505b7aa9b5SPaolo Bonzini error_setg(errp, "unsupported VDI image (disk size %" PRIu64 ", " 4515b7aa9b5SPaolo Bonzini "image bitmap has room for %" PRIu64 ")", 4525b7aa9b5SPaolo Bonzini header.disk_size, 4535b7aa9b5SPaolo Bonzini (uint64_t)header.blocks_in_image * header.block_size); 4548937f822SStefan Weil ret = -ENOTSUP; 4559aebd98aSStefan Weil goto fail; 456ac928b8eSPeter Maydell } else if (!qemu_uuid_is_null(&uuid_link)) { 4575b7aa9b5SPaolo Bonzini error_setg(errp, "unsupported VDI image (non-NULL link UUID)"); 4588937f822SStefan Weil ret = -ENOTSUP; 4599aebd98aSStefan Weil goto fail; 460ac928b8eSPeter Maydell } else if (!qemu_uuid_is_null(&uuid_parent)) { 4615b7aa9b5SPaolo Bonzini error_setg(errp, "unsupported VDI image (non-NULL parent UUID)"); 4628937f822SStefan Weil ret = -ENOTSUP; 4639aebd98aSStefan Weil goto fail; 46463fa06dcSJeff Cody } else if (header.blocks_in_image > VDI_BLOCKS_IN_IMAGE_MAX) { 46563fa06dcSJeff Cody error_setg(errp, "unsupported VDI image " 46663fa06dcSJeff Cody "(too many blocks %u, max is %u)", 46763fa06dcSJeff Cody header.blocks_in_image, VDI_BLOCKS_IN_IMAGE_MAX); 46863fa06dcSJeff Cody ret = -ENOTSUP; 46963fa06dcSJeff Cody goto fail; 4709aebd98aSStefan Weil } 4719aebd98aSStefan Weil 4729aebd98aSStefan Weil bs->total_sectors = header.disk_size / SECTOR_SIZE; 4739aebd98aSStefan Weil 4749aebd98aSStefan Weil s->block_size = header.block_size; 4759aebd98aSStefan Weil s->bmap_sector = header.offset_bmap / SECTOR_SIZE; 4769aebd98aSStefan Weil s->header = header; 4779aebd98aSStefan Weil 4789aebd98aSStefan Weil bmap_size = header.blocks_in_image * sizeof(uint32_t); 479e9082e47SMax Reitz bmap_size = DIV_ROUND_UP(bmap_size, SECTOR_SIZE); 4809a4f4c31SKevin Wolf s->bmap = qemu_try_blockalign(bs->file->bs, bmap_size * SECTOR_SIZE); 48117cce735SKevin Wolf if (s->bmap == NULL) { 48217cce735SKevin Wolf ret = -ENOMEM; 48317cce735SKevin Wolf goto fail; 48417cce735SKevin Wolf } 48517cce735SKevin Wolf 486fbcbbf4eSKevin Wolf ret = bdrv_read(bs->file, s->bmap_sector, (uint8_t *)s->bmap, 4879a4f4c31SKevin Wolf bmap_size); 4888937f822SStefan Weil if (ret < 0) { 4899aebd98aSStefan Weil goto fail_free_bmap; 4909aebd98aSStefan Weil } 4919aebd98aSStefan Weil 492fc9d106cSKevin Wolf /* Disable migration when vdi images are used */ 49381e5f78aSAlberto Garcia error_setg(&s->migration_blocker, "The vdi format used by node '%s' " 49481e5f78aSAlberto Garcia "does not support live migration", 49581e5f78aSAlberto Garcia bdrv_get_device_or_node_name(bs)); 496fe44dc91SAshijeet Acharya ret = migrate_add_blocker(s->migration_blocker, &local_err); 497fe44dc91SAshijeet Acharya if (local_err) { 498fe44dc91SAshijeet Acharya error_propagate(errp, local_err); 499fe44dc91SAshijeet Acharya error_free(s->migration_blocker); 500fe44dc91SAshijeet Acharya goto fail_free_bmap; 501fe44dc91SAshijeet Acharya } 502fc9d106cSKevin Wolf 5031e886639SPaolo Bonzini qemu_co_rwlock_init(&s->bmap_lock); 504f0ab6f10SMax Reitz 5059aebd98aSStefan Weil return 0; 5069aebd98aSStefan Weil 5079aebd98aSStefan Weil fail_free_bmap: 50817cce735SKevin Wolf qemu_vfree(s->bmap); 5099aebd98aSStefan Weil 5109aebd98aSStefan Weil fail: 5118937f822SStefan Weil return ret; 5129aebd98aSStefan Weil } 5139aebd98aSStefan Weil 514ecfe2bbaSJeff Cody static int vdi_reopen_prepare(BDRVReopenState *state, 515ecfe2bbaSJeff Cody BlockReopenQueue *queue, Error **errp) 516ecfe2bbaSJeff Cody { 517ecfe2bbaSJeff Cody return 0; 518ecfe2bbaSJeff Cody } 519ecfe2bbaSJeff Cody 52067635f6aSEric Blake static int coroutine_fn vdi_co_block_status(BlockDriverState *bs, 52167635f6aSEric Blake bool want_zero, 52267635f6aSEric Blake int64_t offset, int64_t bytes, 52367635f6aSEric Blake int64_t *pnum, int64_t *map, 52467635f6aSEric Blake BlockDriverState **file) 5259aebd98aSStefan Weil { 5269aebd98aSStefan Weil BDRVVdiState *s = (BDRVVdiState *)bs->opaque; 52767635f6aSEric Blake size_t bmap_index = offset / s->block_size; 52867635f6aSEric Blake size_t index_in_block = offset % s->block_size; 5299aebd98aSStefan Weil uint32_t bmap_entry = le32_to_cpu(s->bmap[bmap_index]); 5304bc74be9SPaolo Bonzini int result; 5314bc74be9SPaolo Bonzini 53267635f6aSEric Blake logout("%p, %" PRId64 ", %" PRId64 ", %p\n", bs, offset, bytes, pnum); 53367635f6aSEric Blake *pnum = MIN(s->block_size - index_in_block, bytes); 5344bc74be9SPaolo Bonzini result = VDI_IS_ALLOCATED(bmap_entry); 5354bc74be9SPaolo Bonzini if (!result) { 5364bc74be9SPaolo Bonzini return 0; 5374bc74be9SPaolo Bonzini } 5384bc74be9SPaolo Bonzini 53967635f6aSEric Blake *map = s->header.offset_data + (uint64_t)bmap_entry * s->block_size + 54067635f6aSEric Blake index_in_block; 5418bfb1371SFam Zheng *file = bs->file->bs; 54267635f6aSEric Blake return BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID; 5439aebd98aSStefan Weil } 5449aebd98aSStefan Weil 5450865bb6fSKevin Wolf static int coroutine_fn 5460865bb6fSKevin Wolf vdi_co_preadv(BlockDriverState *bs, uint64_t offset, uint64_t bytes, 5470865bb6fSKevin Wolf QEMUIOVector *qiov, int flags) 5489aebd98aSStefan Weil { 5499aebd98aSStefan Weil BDRVVdiState *s = bs->opaque; 5500865bb6fSKevin Wolf QEMUIOVector local_qiov; 5519aebd98aSStefan Weil uint32_t bmap_entry; 5529aebd98aSStefan Weil uint32_t block_index; 5530865bb6fSKevin Wolf uint32_t offset_in_block; 5540865bb6fSKevin Wolf uint32_t n_bytes; 5550865bb6fSKevin Wolf uint64_t bytes_done = 0; 556eb9566d1SPaolo Bonzini int ret = 0; 5574de659e8SPaolo Bonzini 5584de659e8SPaolo Bonzini logout("\n"); 5599aebd98aSStefan Weil 5600865bb6fSKevin Wolf qemu_iovec_init(&local_qiov, qiov->niov); 5619aebd98aSStefan Weil 5620865bb6fSKevin Wolf while (ret >= 0 && bytes > 0) { 5630865bb6fSKevin Wolf block_index = offset / s->block_size; 5640865bb6fSKevin Wolf offset_in_block = offset % s->block_size; 5650865bb6fSKevin Wolf n_bytes = MIN(bytes, s->block_size - offset_in_block); 5660865bb6fSKevin Wolf 5670865bb6fSKevin Wolf logout("will read %u bytes starting at offset %" PRIu64 "\n", 5680865bb6fSKevin Wolf n_bytes, offset); 5699aebd98aSStefan Weil 5709aebd98aSStefan Weil /* prepare next AIO request */ 5711e886639SPaolo Bonzini qemu_co_rwlock_rdlock(&s->bmap_lock); 5729aebd98aSStefan Weil bmap_entry = le32_to_cpu(s->bmap[block_index]); 5731e886639SPaolo Bonzini qemu_co_rwlock_unlock(&s->bmap_lock); 574c794b4e0SEric Sunshine if (!VDI_IS_ALLOCATED(bmap_entry)) { 5759aebd98aSStefan Weil /* Block not allocated, return zeros, no need to wait. */ 5760865bb6fSKevin Wolf qemu_iovec_memset(qiov, bytes_done, 0, n_bytes); 5773d46a75aSPaolo Bonzini ret = 0; 5789aebd98aSStefan Weil } else { 5790865bb6fSKevin Wolf uint64_t data_offset = s->header.offset_data + 5800865bb6fSKevin Wolf (uint64_t)bmap_entry * s->block_size + 5810865bb6fSKevin Wolf offset_in_block; 5820c7bfc32SPaolo Bonzini 5830865bb6fSKevin Wolf qemu_iovec_reset(&local_qiov); 5840865bb6fSKevin Wolf qemu_iovec_concat(&local_qiov, qiov, bytes_done, n_bytes); 5850865bb6fSKevin Wolf 586a03ef88fSKevin Wolf ret = bdrv_co_preadv(bs->file, data_offset, n_bytes, 5870865bb6fSKevin Wolf &local_qiov, 0); 5883d46a75aSPaolo Bonzini } 5890865bb6fSKevin Wolf logout("%u bytes read\n", n_bytes); 5900865bb6fSKevin Wolf 5910865bb6fSKevin Wolf bytes -= n_bytes; 5920865bb6fSKevin Wolf offset += n_bytes; 5930865bb6fSKevin Wolf bytes_done += n_bytes; 5940865bb6fSKevin Wolf } 5950865bb6fSKevin Wolf 5960865bb6fSKevin Wolf qemu_iovec_destroy(&local_qiov); 5973d46a75aSPaolo Bonzini 5983d46a75aSPaolo Bonzini return ret; 5999aebd98aSStefan Weil } 6009aebd98aSStefan Weil 601fde9d56fSKevin Wolf static int coroutine_fn 602fde9d56fSKevin Wolf vdi_co_pwritev(BlockDriverState *bs, uint64_t offset, uint64_t bytes, 603fde9d56fSKevin Wolf QEMUIOVector *qiov, int flags) 6049aebd98aSStefan Weil { 6059aebd98aSStefan Weil BDRVVdiState *s = bs->opaque; 606fde9d56fSKevin Wolf QEMUIOVector local_qiov; 6079aebd98aSStefan Weil uint32_t bmap_entry; 6089aebd98aSStefan Weil uint32_t block_index; 609fde9d56fSKevin Wolf uint32_t offset_in_block; 610fde9d56fSKevin Wolf uint32_t n_bytes; 6111e886639SPaolo Bonzini uint64_t data_offset; 612bfc45fc1SPaolo Bonzini uint32_t bmap_first = VDI_UNALLOCATED; 613bfc45fc1SPaolo Bonzini uint32_t bmap_last = VDI_UNALLOCATED; 614bfc45fc1SPaolo Bonzini uint8_t *block = NULL; 615fde9d56fSKevin Wolf uint64_t bytes_done = 0; 616eb9566d1SPaolo Bonzini int ret = 0; 6174de659e8SPaolo Bonzini 6184de659e8SPaolo Bonzini logout("\n"); 6199aebd98aSStefan Weil 620fde9d56fSKevin Wolf qemu_iovec_init(&local_qiov, qiov->niov); 6219aebd98aSStefan Weil 622fde9d56fSKevin Wolf while (ret >= 0 && bytes > 0) { 623fde9d56fSKevin Wolf block_index = offset / s->block_size; 624fde9d56fSKevin Wolf offset_in_block = offset % s->block_size; 625fde9d56fSKevin Wolf n_bytes = MIN(bytes, s->block_size - offset_in_block); 626fde9d56fSKevin Wolf 627fde9d56fSKevin Wolf logout("will write %u bytes starting at offset %" PRIu64 "\n", 628fde9d56fSKevin Wolf n_bytes, offset); 6299aebd98aSStefan Weil 6309aebd98aSStefan Weil /* prepare next AIO request */ 6311e886639SPaolo Bonzini qemu_co_rwlock_rdlock(&s->bmap_lock); 6329aebd98aSStefan Weil bmap_entry = le32_to_cpu(s->bmap[block_index]); 633c794b4e0SEric Sunshine if (!VDI_IS_ALLOCATED(bmap_entry)) { 6349aebd98aSStefan Weil /* Allocate new block and write to it. */ 635fde9d56fSKevin Wolf uint64_t data_offset; 6361e886639SPaolo Bonzini qemu_co_rwlock_upgrade(&s->bmap_lock); 6371e886639SPaolo Bonzini bmap_entry = le32_to_cpu(s->bmap[block_index]); 6381e886639SPaolo Bonzini if (VDI_IS_ALLOCATED(bmap_entry)) { 6391e886639SPaolo Bonzini /* A concurrent allocation did the work for us. */ 6401e886639SPaolo Bonzini qemu_co_rwlock_downgrade(&s->bmap_lock); 6411e886639SPaolo Bonzini goto nonallocating_write; 6421e886639SPaolo Bonzini } 6431e886639SPaolo Bonzini 6449aebd98aSStefan Weil bmap_entry = s->header.blocks_allocated; 6459aebd98aSStefan Weil s->bmap[block_index] = cpu_to_le32(bmap_entry); 6469aebd98aSStefan Weil s->header.blocks_allocated++; 647fde9d56fSKevin Wolf data_offset = s->header.offset_data + 648fde9d56fSKevin Wolf (uint64_t)bmap_entry * s->block_size; 6499aebd98aSStefan Weil if (block == NULL) { 650641543b7SStefan Weil block = g_malloc(s->block_size); 651bfc45fc1SPaolo Bonzini bmap_first = block_index; 6529aebd98aSStefan Weil } 653bfc45fc1SPaolo Bonzini bmap_last = block_index; 654641543b7SStefan Weil /* Copy data to be written to new block and zero unused parts. */ 655fde9d56fSKevin Wolf memset(block, 0, offset_in_block); 656fde9d56fSKevin Wolf qemu_iovec_to_buf(qiov, bytes_done, block + offset_in_block, 657fde9d56fSKevin Wolf n_bytes); 658fde9d56fSKevin Wolf memset(block + offset_in_block + n_bytes, 0, 659fde9d56fSKevin Wolf s->block_size - n_bytes - offset_in_block); 660f0ab6f10SMax Reitz 6611e886639SPaolo Bonzini /* Write the new block under CoRwLock write-side protection, 6621e886639SPaolo Bonzini * so this full-cluster write does not overlap a partial write 6631e886639SPaolo Bonzini * of the same cluster, issued from the "else" branch. 6641e886639SPaolo Bonzini */ 665d9ca2ea2SKevin Wolf ret = bdrv_pwrite(bs->file, data_offset, block, s->block_size); 6661e886639SPaolo Bonzini qemu_co_rwlock_unlock(&s->bmap_lock); 6679aebd98aSStefan Weil } else { 6681e886639SPaolo Bonzini nonallocating_write: 6691e886639SPaolo Bonzini data_offset = s->header.offset_data + 670fde9d56fSKevin Wolf (uint64_t)bmap_entry * s->block_size + 671fde9d56fSKevin Wolf offset_in_block; 6721e886639SPaolo Bonzini qemu_co_rwlock_unlock(&s->bmap_lock); 673fde9d56fSKevin Wolf 674fde9d56fSKevin Wolf qemu_iovec_reset(&local_qiov); 675fde9d56fSKevin Wolf qemu_iovec_concat(&local_qiov, qiov, bytes_done, n_bytes); 676fde9d56fSKevin Wolf 677a03ef88fSKevin Wolf ret = bdrv_co_pwritev(bs->file, data_offset, n_bytes, 678fde9d56fSKevin Wolf &local_qiov, 0); 6799aebd98aSStefan Weil } 6800c7bfc32SPaolo Bonzini 681fde9d56fSKevin Wolf bytes -= n_bytes; 682fde9d56fSKevin Wolf offset += n_bytes; 683fde9d56fSKevin Wolf bytes_done += n_bytes; 6840c7bfc32SPaolo Bonzini 685fde9d56fSKevin Wolf logout("%u bytes written\n", n_bytes); 6863d46a75aSPaolo Bonzini } 6879aebd98aSStefan Weil 688fde9d56fSKevin Wolf qemu_iovec_destroy(&local_qiov); 689fde9d56fSKevin Wolf 6900c7bfc32SPaolo Bonzini logout("finished data write\n"); 6914eea78e6SPaolo Bonzini if (ret < 0) { 6924eea78e6SPaolo Bonzini return ret; 6934eea78e6SPaolo Bonzini } 6944eea78e6SPaolo Bonzini 695bfc45fc1SPaolo Bonzini if (block) { 6964eea78e6SPaolo Bonzini /* One or more new blocks were allocated. */ 697bfc45fc1SPaolo Bonzini VdiHeader *header = (VdiHeader *) block; 6984eea78e6SPaolo Bonzini uint8_t *base; 6994eea78e6SPaolo Bonzini uint64_t offset; 700fde9d56fSKevin Wolf uint32_t n_sectors; 7014eea78e6SPaolo Bonzini 7020c7bfc32SPaolo Bonzini logout("now writing modified header\n"); 703bfc45fc1SPaolo Bonzini assert(VDI_IS_ALLOCATED(bmap_first)); 7040c7bfc32SPaolo Bonzini *header = s->header; 7050c7bfc32SPaolo Bonzini vdi_header_to_le(header); 70618d51c4bSKevin Wolf ret = bdrv_write(bs->file, 0, block, 1); 707bfc45fc1SPaolo Bonzini g_free(block); 708bfc45fc1SPaolo Bonzini block = NULL; 7094eea78e6SPaolo Bonzini 7104eea78e6SPaolo Bonzini if (ret < 0) { 7114eea78e6SPaolo Bonzini return ret; 7124eea78e6SPaolo Bonzini } 7134eea78e6SPaolo Bonzini 7140c7bfc32SPaolo Bonzini logout("now writing modified block map entry %u...%u\n", 7150c7bfc32SPaolo Bonzini bmap_first, bmap_last); 7160c7bfc32SPaolo Bonzini /* Write modified sectors from block map. */ 7170c7bfc32SPaolo Bonzini bmap_first /= (SECTOR_SIZE / sizeof(uint32_t)); 7180c7bfc32SPaolo Bonzini bmap_last /= (SECTOR_SIZE / sizeof(uint32_t)); 7190c7bfc32SPaolo Bonzini n_sectors = bmap_last - bmap_first + 1; 7200c7bfc32SPaolo Bonzini offset = s->bmap_sector + bmap_first; 7214eea78e6SPaolo Bonzini base = ((uint8_t *)&s->bmap[0]) + bmap_first * SECTOR_SIZE; 7220c7bfc32SPaolo Bonzini logout("will write %u block map sectors starting from entry %u\n", 7230c7bfc32SPaolo Bonzini n_sectors, bmap_first); 72418d51c4bSKevin Wolf ret = bdrv_write(bs->file, offset, base, n_sectors); 7250c7bfc32SPaolo Bonzini } 7260c7bfc32SPaolo Bonzini 7273d46a75aSPaolo Bonzini return ret; 7289aebd98aSStefan Weil } 7299aebd98aSStefan Weil 730e3810574SMax Reitz static int coroutine_fn vdi_co_do_create(BlockdevCreateOptions *create_options, 73149858b50SMax Reitz size_t block_size, Error **errp) 7329aebd98aSStefan Weil { 733e3810574SMax Reitz BlockdevCreateOptionsVdi *vdi_opts; 734dddc7750SJeff Cody int ret = 0; 7359aebd98aSStefan Weil uint64_t bytes = 0; 7369aebd98aSStefan Weil uint32_t blocks; 73761fa6487SKevin Wolf uint32_t image_type; 7389aebd98aSStefan Weil VdiHeader header; 7399aebd98aSStefan Weil size_t i; 7409aebd98aSStefan Weil size_t bmap_size; 74170747862SJeff Cody int64_t offset = 0; 742ec73f060SMax Reitz BlockDriverState *bs_file = NULL; 743a08f0c3bSKevin Wolf BlockBackend *blk = NULL; 74470747862SJeff Cody uint32_t *bmap = NULL; 745ac928b8eSPeter Maydell QemuUUID uuid; 7469aebd98aSStefan Weil 747e3810574SMax Reitz assert(create_options->driver == BLOCKDEV_DRIVER_VDI); 748e3810574SMax Reitz vdi_opts = &create_options->u.vdi; 749e3810574SMax Reitz 7509aebd98aSStefan Weil logout("\n"); 7519aebd98aSStefan Weil 752da23248fSKevin Wolf /* Validate options and set default values */ 75349858b50SMax Reitz bytes = vdi_opts->size; 75461fa6487SKevin Wolf 75561fa6487SKevin Wolf if (!vdi_opts->has_preallocation) { 75661fa6487SKevin Wolf vdi_opts->preallocation = PREALLOC_MODE_OFF; 7576eea90ebSStefan Weil } 75861fa6487SKevin Wolf switch (vdi_opts->preallocation) { 75961fa6487SKevin Wolf case PREALLOC_MODE_OFF: 76061fa6487SKevin Wolf image_type = VDI_TYPE_DYNAMIC; 76161fa6487SKevin Wolf break; 76261fa6487SKevin Wolf case PREALLOC_MODE_METADATA: 76361fa6487SKevin Wolf image_type = VDI_TYPE_STATIC; 76461fa6487SKevin Wolf break; 76561fa6487SKevin Wolf default: 76661fa6487SKevin Wolf error_setg(errp, "Preallocation mode not supported for vdi"); 76761fa6487SKevin Wolf return -EINVAL; 76861fa6487SKevin Wolf } 76961fa6487SKevin Wolf 77049858b50SMax Reitz #ifndef CONFIG_VDI_STATIC_IMAGE 77149858b50SMax Reitz if (image_type == VDI_TYPE_STATIC) { 77249858b50SMax Reitz ret = -ENOTSUP; 77349858b50SMax Reitz error_setg(errp, "Statically allocated images cannot be created in " 77449858b50SMax Reitz "this build"); 77549858b50SMax Reitz goto exit; 77649858b50SMax Reitz } 77749858b50SMax Reitz #endif 77849858b50SMax Reitz #ifndef CONFIG_VDI_BLOCK_SIZE 77949858b50SMax Reitz if (block_size != DEFAULT_CLUSTER_SIZE) { 78049858b50SMax Reitz ret = -ENOTSUP; 78149858b50SMax Reitz error_setg(errp, 78249858b50SMax Reitz "A non-default cluster size is not supported in this build"); 78349858b50SMax Reitz goto exit; 78449858b50SMax Reitz } 7859aebd98aSStefan Weil #endif 7869aebd98aSStefan Weil 78763fa06dcSJeff Cody if (bytes > VDI_DISK_SIZE_MAX) { 788dddc7750SJeff Cody ret = -ENOTSUP; 78963fa06dcSJeff Cody error_setg(errp, "Unsupported VDI image size (size is 0x%" PRIx64 79063fa06dcSJeff Cody ", max supported is 0x%" PRIx64 ")", 79163fa06dcSJeff Cody bytes, VDI_DISK_SIZE_MAX); 79263fa06dcSJeff Cody goto exit; 79363fa06dcSJeff Cody } 79463fa06dcSJeff Cody 795da23248fSKevin Wolf /* Create BlockBackend to write to the image */ 796ec73f060SMax Reitz bs_file = bdrv_open_blockdev_ref(vdi_opts->file, errp); 797ec73f060SMax Reitz if (!bs_file) { 798ec73f060SMax Reitz ret = -EIO; 79963fa06dcSJeff Cody goto exit; 8009aebd98aSStefan Weil } 801a08f0c3bSKevin Wolf 802ec73f060SMax Reitz blk = blk_new(BLK_PERM_WRITE | BLK_PERM_RESIZE, BLK_PERM_ALL); 803ec73f060SMax Reitz ret = blk_insert_bs(blk, bs_file, errp); 804ec73f060SMax Reitz if (ret < 0) { 80570747862SJeff Cody goto exit; 8064ab15590SChunyan Liu } 8074ab15590SChunyan Liu 808a08f0c3bSKevin Wolf blk_set_allow_write_beyond_eof(blk, true); 809a08f0c3bSKevin Wolf 810f21dc3a4SStefan Weil /* We need enough blocks to store the given disk size, 811f21dc3a4SStefan Weil so always round up. */ 812e9082e47SMax Reitz blocks = DIV_ROUND_UP(bytes, block_size); 813f21dc3a4SStefan Weil 8149aebd98aSStefan Weil bmap_size = blocks * sizeof(uint32_t); 815e9082e47SMax Reitz bmap_size = ROUND_UP(bmap_size, SECTOR_SIZE); 8169aebd98aSStefan Weil 8179aebd98aSStefan Weil memset(&header, 0, sizeof(header)); 8181786dc15SBlue Swirl pstrcpy(header.text, sizeof(header.text), VDI_TEXT); 8199aebd98aSStefan Weil header.signature = VDI_SIGNATURE; 8209aebd98aSStefan Weil header.version = VDI_VERSION_1_1; 8219aebd98aSStefan Weil header.header_size = 0x180; 8229aebd98aSStefan Weil header.image_type = image_type; 8239aebd98aSStefan Weil header.offset_bmap = 0x200; 8249aebd98aSStefan Weil header.offset_data = 0x200 + bmap_size; 8259aebd98aSStefan Weil header.sector_size = SECTOR_SIZE; 8269aebd98aSStefan Weil header.disk_size = bytes; 8279aebd98aSStefan Weil header.block_size = block_size; 8289aebd98aSStefan Weil header.blocks_in_image = blocks; 8296eea90ebSStefan Weil if (image_type == VDI_TYPE_STATIC) { 8306eea90ebSStefan Weil header.blocks_allocated = blocks; 8316eea90ebSStefan Weil } 832ac928b8eSPeter Maydell qemu_uuid_generate(&uuid); 833ac928b8eSPeter Maydell header.uuid_image = uuid; 834ac928b8eSPeter Maydell qemu_uuid_generate(&uuid); 835ac928b8eSPeter Maydell header.uuid_last_snap = uuid; 8369aebd98aSStefan Weil /* There is no need to set header.uuid_link or header.uuid_parent here. */ 83795a14d51SKevin Wolf if (VDI_DEBUG) { 8389aebd98aSStefan Weil vdi_header_print(&header); 83995a14d51SKevin Wolf } 8409aebd98aSStefan Weil vdi_header_to_le(&header); 8418341f00dSEric Blake ret = blk_pwrite(blk, offset, &header, sizeof(header), 0); 842dddc7750SJeff Cody if (ret < 0) { 843ec73f060SMax Reitz error_setg(errp, "Error writing header"); 84470747862SJeff Cody goto exit; 8459aebd98aSStefan Weil } 84670747862SJeff Cody offset += sizeof(header); 8479aebd98aSStefan Weil 848b76b6e95SStefan Weil if (bmap_size > 0) { 84917cce735SKevin Wolf bmap = g_try_malloc0(bmap_size); 85017cce735SKevin Wolf if (bmap == NULL) { 85117cce735SKevin Wolf ret = -ENOMEM; 85217cce735SKevin Wolf error_setg(errp, "Could not allocate bmap"); 85317cce735SKevin Wolf goto exit; 85417cce735SKevin Wolf } 8559aebd98aSStefan Weil for (i = 0; i < blocks; i++) { 8569aebd98aSStefan Weil if (image_type == VDI_TYPE_STATIC) { 8579aebd98aSStefan Weil bmap[i] = i; 8589aebd98aSStefan Weil } else { 8599aebd98aSStefan Weil bmap[i] = VDI_UNALLOCATED; 8609aebd98aSStefan Weil } 8619aebd98aSStefan Weil } 8628341f00dSEric Blake ret = blk_pwrite(blk, offset, bmap, bmap_size, 0); 863dddc7750SJeff Cody if (ret < 0) { 864ec73f060SMax Reitz error_setg(errp, "Error writing bmap"); 86570747862SJeff Cody goto exit; 8669aebd98aSStefan Weil } 86770747862SJeff Cody offset += bmap_size; 868514f21a5SStefan Weil } 869514f21a5SStefan Weil 8709aebd98aSStefan Weil if (image_type == VDI_TYPE_STATIC) { 8713a691c50SMax Reitz ret = blk_truncate(blk, offset + blocks * block_size, 8723a691c50SMax Reitz PREALLOC_MODE_OFF, errp); 873dddc7750SJeff Cody if (ret < 0) { 874ec73f060SMax Reitz error_prepend(errp, "Failed to statically allocate file"); 87570747862SJeff Cody goto exit; 8769aebd98aSStefan Weil } 8779aebd98aSStefan Weil } 8789aebd98aSStefan Weil 87953618dd8SKevin Wolf ret = 0; 88063fa06dcSJeff Cody exit: 881a08f0c3bSKevin Wolf blk_unref(blk); 882ec73f060SMax Reitz bdrv_unref(bs_file); 88370747862SJeff Cody g_free(bmap); 884dddc7750SJeff Cody return ret; 8859aebd98aSStefan Weil } 8869aebd98aSStefan Weil 887e3810574SMax Reitz static int coroutine_fn vdi_co_create(BlockdevCreateOptions *create_options, 888e3810574SMax Reitz Error **errp) 889e3810574SMax Reitz { 890e3810574SMax Reitz return vdi_co_do_create(create_options, DEFAULT_CLUSTER_SIZE, errp); 891e3810574SMax Reitz } 892e3810574SMax Reitz 89349858b50SMax Reitz static int coroutine_fn vdi_co_create_opts(const char *filename, QemuOpts *opts, 89449858b50SMax Reitz Error **errp) 89549858b50SMax Reitz { 89649858b50SMax Reitz QDict *qdict = NULL; 897e3810574SMax Reitz BlockdevCreateOptions *create_options = NULL; 898ec73f060SMax Reitz BlockDriverState *bs_file = NULL; 89949858b50SMax Reitz uint64_t block_size = DEFAULT_CLUSTER_SIZE; 90061fa6487SKevin Wolf bool is_static = false; 90149858b50SMax Reitz Visitor *v; 90249858b50SMax Reitz Error *local_err = NULL; 90349858b50SMax Reitz int ret; 90449858b50SMax Reitz 905da23248fSKevin Wolf /* Parse options and convert legacy syntax. 906da23248fSKevin Wolf * 907da23248fSKevin Wolf * Since CONFIG_VDI_BLOCK_SIZE is disabled by default, 90849858b50SMax Reitz * cluster-size is not part of the QAPI schema; therefore we have 90949858b50SMax Reitz * to parse it before creating the QAPI object. */ 91049858b50SMax Reitz #if defined(CONFIG_VDI_BLOCK_SIZE) 91149858b50SMax Reitz block_size = qemu_opt_get_size_del(opts, 91249858b50SMax Reitz BLOCK_OPT_CLUSTER_SIZE, 91349858b50SMax Reitz DEFAULT_CLUSTER_SIZE); 91449858b50SMax Reitz if (block_size < BDRV_SECTOR_SIZE || block_size > UINT32_MAX || 91549858b50SMax Reitz !is_power_of_2(block_size)) 91649858b50SMax Reitz { 91749858b50SMax Reitz error_setg(errp, "Invalid cluster size"); 91849858b50SMax Reitz ret = -EINVAL; 91949858b50SMax Reitz goto done; 92049858b50SMax Reitz } 92149858b50SMax Reitz #endif 92261fa6487SKevin Wolf if (qemu_opt_get_bool_del(opts, BLOCK_OPT_STATIC, false)) { 92361fa6487SKevin Wolf is_static = true; 92461fa6487SKevin Wolf } 92549858b50SMax Reitz 92649858b50SMax Reitz qdict = qemu_opts_to_qdict_filtered(opts, NULL, &vdi_create_opts, true); 92749858b50SMax Reitz 928da23248fSKevin Wolf /* Create and open the file (protocol layer) */ 929ec73f060SMax Reitz ret = bdrv_create_file(filename, opts, errp); 930ec73f060SMax Reitz if (ret < 0) { 931ec73f060SMax Reitz goto done; 932ec73f060SMax Reitz } 933ec73f060SMax Reitz 934ec73f060SMax Reitz bs_file = bdrv_open(filename, NULL, NULL, 935ec73f060SMax Reitz BDRV_O_RDWR | BDRV_O_RESIZE | BDRV_O_PROTOCOL, errp); 936ec73f060SMax Reitz if (!bs_file) { 937ec73f060SMax Reitz ret = -EIO; 938ec73f060SMax Reitz goto done; 939ec73f060SMax Reitz } 940ec73f060SMax Reitz 941e3810574SMax Reitz qdict_put_str(qdict, "driver", "vdi"); 942ec73f060SMax Reitz qdict_put_str(qdict, "file", bs_file->node_name); 94361fa6487SKevin Wolf if (is_static) { 94461fa6487SKevin Wolf qdict_put_str(qdict, "preallocation", "metadata"); 94561fa6487SKevin Wolf } 94649858b50SMax Reitz 94749858b50SMax Reitz /* Get the QAPI object */ 948f853465aSMarkus Armbruster v = qobject_input_visitor_new_flat_confused(qdict, errp); 949f853465aSMarkus Armbruster if (!v) { 950f853465aSMarkus Armbruster ret = -EINVAL; 951f853465aSMarkus Armbruster goto done; 952f853465aSMarkus Armbruster } 953e3810574SMax Reitz visit_type_BlockdevCreateOptions(v, NULL, &create_options, &local_err); 95449858b50SMax Reitz visit_free(v); 95549858b50SMax Reitz 95649858b50SMax Reitz if (local_err) { 95749858b50SMax Reitz error_propagate(errp, local_err); 95849858b50SMax Reitz ret = -EINVAL; 95949858b50SMax Reitz goto done; 96049858b50SMax Reitz } 96149858b50SMax Reitz 962da23248fSKevin Wolf /* Silently round up size */ 963e3810574SMax Reitz assert(create_options->driver == BLOCKDEV_DRIVER_VDI); 964e3810574SMax Reitz create_options->u.vdi.size = ROUND_UP(create_options->u.vdi.size, 965e3810574SMax Reitz BDRV_SECTOR_SIZE); 96649858b50SMax Reitz 967da23248fSKevin Wolf /* Create the vdi image (format layer) */ 968ec73f060SMax Reitz ret = vdi_co_do_create(create_options, block_size, errp); 96949858b50SMax Reitz done: 970cb3e7f08SMarc-André Lureau qobject_unref(qdict); 971e3810574SMax Reitz qapi_free_BlockdevCreateOptions(create_options); 972ec73f060SMax Reitz bdrv_unref(bs_file); 97349858b50SMax Reitz return ret; 97449858b50SMax Reitz } 97549858b50SMax Reitz 9769aebd98aSStefan Weil static void vdi_close(BlockDriverState *bs) 9779aebd98aSStefan Weil { 978fc9d106cSKevin Wolf BDRVVdiState *s = bs->opaque; 9796ac5f388SKevin Wolf 98017cce735SKevin Wolf qemu_vfree(s->bmap); 9816ac5f388SKevin Wolf 982fc9d106cSKevin Wolf migrate_del_blocker(s->migration_blocker); 983fc9d106cSKevin Wolf error_free(s->migration_blocker); 9849aebd98aSStefan Weil } 9859aebd98aSStefan Weil 986004b7f25SChunyan Liu static QemuOptsList vdi_create_opts = { 987004b7f25SChunyan Liu .name = "vdi-create-opts", 988004b7f25SChunyan Liu .head = QTAILQ_HEAD_INITIALIZER(vdi_create_opts.head), 989004b7f25SChunyan Liu .desc = { 9909aebd98aSStefan Weil { 9919aebd98aSStefan Weil .name = BLOCK_OPT_SIZE, 992004b7f25SChunyan Liu .type = QEMU_OPT_SIZE, 9939aebd98aSStefan Weil .help = "Virtual disk size" 9949aebd98aSStefan Weil }, 9959aebd98aSStefan Weil #if defined(CONFIG_VDI_BLOCK_SIZE) 9969aebd98aSStefan Weil { 9979aebd98aSStefan Weil .name = BLOCK_OPT_CLUSTER_SIZE, 998004b7f25SChunyan Liu .type = QEMU_OPT_SIZE, 99999cce9faSKevin Wolf .help = "VDI cluster (block) size", 1000004b7f25SChunyan Liu .def_value_str = stringify(DEFAULT_CLUSTER_SIZE) 10019aebd98aSStefan Weil }, 10029aebd98aSStefan Weil #endif 10039aebd98aSStefan Weil #if defined(CONFIG_VDI_STATIC_IMAGE) 10049aebd98aSStefan Weil { 10059aebd98aSStefan Weil .name = BLOCK_OPT_STATIC, 1006004b7f25SChunyan Liu .type = QEMU_OPT_BOOL, 1007004b7f25SChunyan Liu .help = "VDI static (pre-allocated) image", 1008004b7f25SChunyan Liu .def_value_str = "off" 10099aebd98aSStefan Weil }, 10109aebd98aSStefan Weil #endif 10119aebd98aSStefan Weil /* TODO: An additional option to set UUID values might be useful. */ 1012004b7f25SChunyan Liu { /* end of list */ } 1013004b7f25SChunyan Liu } 10149aebd98aSStefan Weil }; 10159aebd98aSStefan Weil 10169aebd98aSStefan Weil static BlockDriver bdrv_vdi = { 10179aebd98aSStefan Weil .format_name = "vdi", 10189aebd98aSStefan Weil .instance_size = sizeof(BDRVVdiState), 10199aebd98aSStefan Weil .bdrv_probe = vdi_probe, 10209aebd98aSStefan Weil .bdrv_open = vdi_open, 10219aebd98aSStefan Weil .bdrv_close = vdi_close, 1022ecfe2bbaSJeff Cody .bdrv_reopen_prepare = vdi_reopen_prepare, 1023862f215fSKevin Wolf .bdrv_child_perm = bdrv_format_default_perms, 1024e3810574SMax Reitz .bdrv_co_create = vdi_co_create, 1025da23248fSKevin Wolf .bdrv_co_create_opts = vdi_co_create_opts, 10263ac21627SPeter Lieven .bdrv_has_zero_init = bdrv_has_zero_init_1, 102767635f6aSEric Blake .bdrv_co_block_status = vdi_co_block_status, 10289aebd98aSStefan Weil .bdrv_make_empty = vdi_make_empty, 10299aebd98aSStefan Weil 10300865bb6fSKevin Wolf .bdrv_co_preadv = vdi_co_preadv, 10319aebd98aSStefan Weil #if defined(CONFIG_VDI_WRITE) 1032fde9d56fSKevin Wolf .bdrv_co_pwritev = vdi_co_pwritev, 10339aebd98aSStefan Weil #endif 10349aebd98aSStefan Weil 10359aebd98aSStefan Weil .bdrv_get_info = vdi_get_info, 10369aebd98aSStefan Weil 1037004b7f25SChunyan Liu .create_opts = &vdi_create_opts, 10382fd61638SPaolo Bonzini .bdrv_co_check = vdi_co_check, 10399aebd98aSStefan Weil }; 10409aebd98aSStefan Weil 10419aebd98aSStefan Weil static void bdrv_vdi_init(void) 10429aebd98aSStefan Weil { 10439aebd98aSStefan Weil logout("\n"); 10449aebd98aSStefan Weil bdrv_register(&bdrv_vdi); 10459aebd98aSStefan Weil } 10469aebd98aSStefan Weil 10479aebd98aSStefan Weil block_init(bdrv_vdi_init); 1048