1019d6b8fSAnthony Liguori /* 2cc2040f8SStefan Weil * Block driver for Connectix / Microsoft Virtual PC images 3019d6b8fSAnthony Liguori * 4019d6b8fSAnthony Liguori * Copyright (c) 2005 Alex Beregszaszi 5019d6b8fSAnthony Liguori * Copyright (c) 2009 Kevin Wolf <kwolf@suse.de> 6019d6b8fSAnthony Liguori * 7019d6b8fSAnthony Liguori * Permission is hereby granted, free of charge, to any person obtaining a copy 8019d6b8fSAnthony Liguori * of this software and associated documentation files (the "Software"), to deal 9019d6b8fSAnthony Liguori * in the Software without restriction, including without limitation the rights 10019d6b8fSAnthony Liguori * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 11019d6b8fSAnthony Liguori * copies of the Software, and to permit persons to whom the Software is 12019d6b8fSAnthony Liguori * furnished to do so, subject to the following conditions: 13019d6b8fSAnthony Liguori * 14019d6b8fSAnthony Liguori * The above copyright notice and this permission notice shall be included in 15019d6b8fSAnthony Liguori * all copies or substantial portions of the Software. 16019d6b8fSAnthony Liguori * 17019d6b8fSAnthony Liguori * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 18019d6b8fSAnthony Liguori * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 19019d6b8fSAnthony Liguori * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 20019d6b8fSAnthony Liguori * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 21019d6b8fSAnthony Liguori * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 22019d6b8fSAnthony Liguori * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 23019d6b8fSAnthony Liguori * THE SOFTWARE. 24019d6b8fSAnthony Liguori */ 25019d6b8fSAnthony Liguori #include "qemu-common.h" 26737e150eSPaolo Bonzini #include "block/block_int.h" 271de7afc9SPaolo Bonzini #include "qemu/module.h" 28caf71f86SPaolo Bonzini #include "migration/migration.h" 291fe1fa51SCharles Arnold #if defined(CONFIG_UUID) 301fe1fa51SCharles Arnold #include <uuid/uuid.h> 311fe1fa51SCharles Arnold #endif 32019d6b8fSAnthony Liguori 33019d6b8fSAnthony Liguori /**************************************************************/ 34019d6b8fSAnthony Liguori 35019d6b8fSAnthony Liguori #define HEADER_SIZE 512 36019d6b8fSAnthony Liguori 37019d6b8fSAnthony Liguori //#define CACHE 38019d6b8fSAnthony Liguori 39019d6b8fSAnthony Liguori enum vhd_type { 40019d6b8fSAnthony Liguori VHD_FIXED = 2, 41019d6b8fSAnthony Liguori VHD_DYNAMIC = 3, 42019d6b8fSAnthony Liguori VHD_DIFFERENCING = 4, 43019d6b8fSAnthony Liguori }; 44019d6b8fSAnthony Liguori 45019d6b8fSAnthony Liguori // Seconds since Jan 1, 2000 0:00:00 (UTC) 46019d6b8fSAnthony Liguori #define VHD_TIMESTAMP_BASE 946684800 47019d6b8fSAnthony Liguori 48019d6b8fSAnthony Liguori // always big-endian 49e54835c0SJeff Cody typedef struct vhd_footer { 50019d6b8fSAnthony Liguori char creator[8]; // "conectix" 51019d6b8fSAnthony Liguori uint32_t features; 52019d6b8fSAnthony Liguori uint32_t version; 53019d6b8fSAnthony Liguori 54019d6b8fSAnthony Liguori // Offset of next header structure, 0xFFFFFFFF if none 55019d6b8fSAnthony Liguori uint64_t data_offset; 56019d6b8fSAnthony Liguori 57019d6b8fSAnthony Liguori // Seconds since Jan 1, 2000 0:00:00 (UTC) 58019d6b8fSAnthony Liguori uint32_t timestamp; 59019d6b8fSAnthony Liguori 60019d6b8fSAnthony Liguori char creator_app[4]; // "vpc " 61019d6b8fSAnthony Liguori uint16_t major; 62019d6b8fSAnthony Liguori uint16_t minor; 63019d6b8fSAnthony Liguori char creator_os[4]; // "Wi2k" 64019d6b8fSAnthony Liguori 65019d6b8fSAnthony Liguori uint64_t orig_size; 66019d6b8fSAnthony Liguori uint64_t size; 67019d6b8fSAnthony Liguori 68019d6b8fSAnthony Liguori uint16_t cyls; 69019d6b8fSAnthony Liguori uint8_t heads; 70019d6b8fSAnthony Liguori uint8_t secs_per_cyl; 71019d6b8fSAnthony Liguori 72019d6b8fSAnthony Liguori uint32_t type; 73019d6b8fSAnthony Liguori 74019d6b8fSAnthony Liguori // Checksum of the Hard Disk Footer ("one's complement of the sum of all 75019d6b8fSAnthony Liguori // the bytes in the footer without the checksum field") 76019d6b8fSAnthony Liguori uint32_t checksum; 77019d6b8fSAnthony Liguori 78019d6b8fSAnthony Liguori // UUID used to identify a parent hard disk (backing file) 79019d6b8fSAnthony Liguori uint8_t uuid[16]; 80019d6b8fSAnthony Liguori 81019d6b8fSAnthony Liguori uint8_t in_saved_state; 82e54835c0SJeff Cody } QEMU_PACKED VHDFooter; 83019d6b8fSAnthony Liguori 84e54835c0SJeff Cody typedef struct vhd_dyndisk_header { 85019d6b8fSAnthony Liguori char magic[8]; // "cxsparse" 86019d6b8fSAnthony Liguori 87019d6b8fSAnthony Liguori // Offset of next header structure, 0xFFFFFFFF if none 88019d6b8fSAnthony Liguori uint64_t data_offset; 89019d6b8fSAnthony Liguori 90019d6b8fSAnthony Liguori // Offset of the Block Allocation Table (BAT) 91019d6b8fSAnthony Liguori uint64_t table_offset; 92019d6b8fSAnthony Liguori 93019d6b8fSAnthony Liguori uint32_t version; 94019d6b8fSAnthony Liguori uint32_t max_table_entries; // 32bit/entry 95019d6b8fSAnthony Liguori 96019d6b8fSAnthony Liguori // 2 MB by default, must be a power of two 97019d6b8fSAnthony Liguori uint32_t block_size; 98019d6b8fSAnthony Liguori 99019d6b8fSAnthony Liguori uint32_t checksum; 100019d6b8fSAnthony Liguori uint8_t parent_uuid[16]; 101019d6b8fSAnthony Liguori uint32_t parent_timestamp; 102019d6b8fSAnthony Liguori uint32_t reserved; 103019d6b8fSAnthony Liguori 104019d6b8fSAnthony Liguori // Backing file name (in UTF-16) 105019d6b8fSAnthony Liguori uint8_t parent_name[512]; 106019d6b8fSAnthony Liguori 107019d6b8fSAnthony Liguori struct { 108019d6b8fSAnthony Liguori uint32_t platform; 109019d6b8fSAnthony Liguori uint32_t data_space; 110019d6b8fSAnthony Liguori uint32_t data_length; 111019d6b8fSAnthony Liguori uint32_t reserved; 112019d6b8fSAnthony Liguori uint64_t data_offset; 113019d6b8fSAnthony Liguori } parent_locator[8]; 114e54835c0SJeff Cody } QEMU_PACKED VHDDynDiskHeader; 115019d6b8fSAnthony Liguori 116019d6b8fSAnthony Liguori typedef struct BDRVVPCState { 117848c66e8SPaolo Bonzini CoMutex lock; 118019d6b8fSAnthony Liguori uint8_t footer_buf[HEADER_SIZE]; 119019d6b8fSAnthony Liguori uint64_t free_data_block_offset; 120019d6b8fSAnthony Liguori int max_table_entries; 121019d6b8fSAnthony Liguori uint32_t *pagetable; 122019d6b8fSAnthony Liguori uint64_t bat_offset; 123019d6b8fSAnthony Liguori uint64_t last_bitmap_offset; 124019d6b8fSAnthony Liguori 125019d6b8fSAnthony Liguori uint32_t block_size; 126019d6b8fSAnthony Liguori uint32_t bitmap_size; 127019d6b8fSAnthony Liguori 128019d6b8fSAnthony Liguori #ifdef CACHE 129019d6b8fSAnthony Liguori uint8_t *pageentry_u8; 130019d6b8fSAnthony Liguori uint32_t *pageentry_u32; 131019d6b8fSAnthony Liguori uint16_t *pageentry_u16; 132019d6b8fSAnthony Liguori 133019d6b8fSAnthony Liguori uint64_t last_bitmap; 134019d6b8fSAnthony Liguori #endif 135612ff3d8SKevin Wolf 136612ff3d8SKevin Wolf Error *migration_blocker; 137019d6b8fSAnthony Liguori } BDRVVPCState; 138019d6b8fSAnthony Liguori 139019d6b8fSAnthony Liguori static uint32_t vpc_checksum(uint8_t* buf, size_t size) 140019d6b8fSAnthony Liguori { 141019d6b8fSAnthony Liguori uint32_t res = 0; 142019d6b8fSAnthony Liguori int i; 143019d6b8fSAnthony Liguori 144019d6b8fSAnthony Liguori for (i = 0; i < size; i++) 145019d6b8fSAnthony Liguori res += buf[i]; 146019d6b8fSAnthony Liguori 147019d6b8fSAnthony Liguori return ~res; 148019d6b8fSAnthony Liguori } 149019d6b8fSAnthony Liguori 150019d6b8fSAnthony Liguori 151019d6b8fSAnthony Liguori static int vpc_probe(const uint8_t *buf, int buf_size, const char *filename) 152019d6b8fSAnthony Liguori { 153019d6b8fSAnthony Liguori if (buf_size >= 8 && !strncmp((char *)buf, "conectix", 8)) 154019d6b8fSAnthony Liguori return 100; 155019d6b8fSAnthony Liguori return 0; 156019d6b8fSAnthony Liguori } 157019d6b8fSAnthony Liguori 158015a1036SMax Reitz static int vpc_open(BlockDriverState *bs, QDict *options, int flags, 159015a1036SMax Reitz Error **errp) 160019d6b8fSAnthony Liguori { 161019d6b8fSAnthony Liguori BDRVVPCState *s = bs->opaque; 16266f82ceeSKevin Wolf int i; 163e54835c0SJeff Cody VHDFooter *footer; 164e54835c0SJeff Cody VHDDynDiskHeader *dyndisk_header; 165019d6b8fSAnthony Liguori uint8_t buf[HEADER_SIZE]; 166019d6b8fSAnthony Liguori uint32_t checksum; 16724da78dbSCharles Arnold int disk_type = VHD_DYNAMIC; 16859294e46SKevin Wolf int ret; 169019d6b8fSAnthony Liguori 17059294e46SKevin Wolf ret = bdrv_pread(bs->file, 0, s->footer_buf, HEADER_SIZE); 17159294e46SKevin Wolf if (ret < 0) { 172019d6b8fSAnthony Liguori goto fail; 17359294e46SKevin Wolf } 174019d6b8fSAnthony Liguori 175e54835c0SJeff Cody footer = (VHDFooter *) s->footer_buf; 17624da78dbSCharles Arnold if (strncmp(footer->creator, "conectix", 8)) { 17724da78dbSCharles Arnold int64_t offset = bdrv_getlength(bs->file); 17859294e46SKevin Wolf if (offset < 0) { 17959294e46SKevin Wolf ret = offset; 18059294e46SKevin Wolf goto fail; 18159294e46SKevin Wolf } else if (offset < HEADER_SIZE) { 18259294e46SKevin Wolf ret = -EINVAL; 183019d6b8fSAnthony Liguori goto fail; 18424da78dbSCharles Arnold } 18559294e46SKevin Wolf 18624da78dbSCharles Arnold /* If a fixed disk, the footer is found only at the end of the file */ 18759294e46SKevin Wolf ret = bdrv_pread(bs->file, offset-HEADER_SIZE, s->footer_buf, 18859294e46SKevin Wolf HEADER_SIZE); 18959294e46SKevin Wolf if (ret < 0) { 19024da78dbSCharles Arnold goto fail; 19124da78dbSCharles Arnold } 19224da78dbSCharles Arnold if (strncmp(footer->creator, "conectix", 8)) { 19359294e46SKevin Wolf ret = -EMEDIUMTYPE; 19424da78dbSCharles Arnold goto fail; 19524da78dbSCharles Arnold } 19624da78dbSCharles Arnold disk_type = VHD_FIXED; 19724da78dbSCharles Arnold } 198019d6b8fSAnthony Liguori 199019d6b8fSAnthony Liguori checksum = be32_to_cpu(footer->checksum); 200019d6b8fSAnthony Liguori footer->checksum = 0; 201019d6b8fSAnthony Liguori if (vpc_checksum(s->footer_buf, HEADER_SIZE) != checksum) 202019d6b8fSAnthony Liguori fprintf(stderr, "block-vpc: The header checksum of '%s' is " 20366f82ceeSKevin Wolf "incorrect.\n", bs->filename); 204019d6b8fSAnthony Liguori 205c088b691SZhang Shengju /* Write 'checksum' back to footer, or else will leave it with zero. */ 206c088b691SZhang Shengju footer->checksum = be32_to_cpu(checksum); 207c088b691SZhang Shengju 20833ccf667SStefan Hajnoczi // The visible size of a image in Virtual PC depends on the geometry 20933ccf667SStefan Hajnoczi // rather than on the size stored in the footer (the size in the footer 21033ccf667SStefan Hajnoczi // is too large usually) 21133ccf667SStefan Hajnoczi bs->total_sectors = (int64_t) 21233ccf667SStefan Hajnoczi be16_to_cpu(footer->cyls) * footer->heads * footer->secs_per_cyl; 213019d6b8fSAnthony Liguori 2140173e7bbSPeter Lieven /* images created with disk2vhd report a far higher virtual size 2150173e7bbSPeter Lieven * than expected with the cyls * heads * sectors_per_cyl formula. 2160173e7bbSPeter Lieven * use the footer->size instead if the image was created with 2170173e7bbSPeter Lieven * disk2vhd. 2180173e7bbSPeter Lieven */ 2190173e7bbSPeter Lieven if (!strncmp(footer->creator_app, "d2v", 4)) { 2200173e7bbSPeter Lieven bs->total_sectors = be64_to_cpu(footer->size) / BDRV_SECTOR_SIZE; 2210173e7bbSPeter Lieven } 2220173e7bbSPeter Lieven 223258d2edbSCharles Arnold /* Allow a maximum disk size of approximately 2 TB */ 224258d2edbSCharles Arnold if (bs->total_sectors >= 65535LL * 255 * 255) { 22559294e46SKevin Wolf ret = -EFBIG; 226efc8243dSSerge E. Hallyn goto fail; 227efc8243dSSerge E. Hallyn } 228efc8243dSSerge E. Hallyn 22924da78dbSCharles Arnold if (disk_type == VHD_DYNAMIC) { 23059294e46SKevin Wolf ret = bdrv_pread(bs->file, be64_to_cpu(footer->data_offset), buf, 23159294e46SKevin Wolf HEADER_SIZE); 23259294e46SKevin Wolf if (ret < 0) { 233019d6b8fSAnthony Liguori goto fail; 23424da78dbSCharles Arnold } 235019d6b8fSAnthony Liguori 236e54835c0SJeff Cody dyndisk_header = (VHDDynDiskHeader *) buf; 237019d6b8fSAnthony Liguori 23824da78dbSCharles Arnold if (strncmp(dyndisk_header->magic, "cxsparse", 8)) { 23959294e46SKevin Wolf ret = -EINVAL; 240019d6b8fSAnthony Liguori goto fail; 24124da78dbSCharles Arnold } 242019d6b8fSAnthony Liguori 243019d6b8fSAnthony Liguori s->block_size = be32_to_cpu(dyndisk_header->block_size); 244019d6b8fSAnthony Liguori s->bitmap_size = ((s->block_size / (8 * 512)) + 511) & ~511; 245019d6b8fSAnthony Liguori 246019d6b8fSAnthony Liguori s->max_table_entries = be32_to_cpu(dyndisk_header->max_table_entries); 2477267c094SAnthony Liguori s->pagetable = g_malloc(s->max_table_entries * 4); 248019d6b8fSAnthony Liguori 249019d6b8fSAnthony Liguori s->bat_offset = be64_to_cpu(dyndisk_header->table_offset); 25059294e46SKevin Wolf 25159294e46SKevin Wolf ret = bdrv_pread(bs->file, s->bat_offset, s->pagetable, 25259294e46SKevin Wolf s->max_table_entries * 4); 25359294e46SKevin Wolf if (ret < 0) { 254019d6b8fSAnthony Liguori goto fail; 25524da78dbSCharles Arnold } 256019d6b8fSAnthony Liguori 257019d6b8fSAnthony Liguori s->free_data_block_offset = 258019d6b8fSAnthony Liguori (s->bat_offset + (s->max_table_entries * 4) + 511) & ~511; 259019d6b8fSAnthony Liguori 260019d6b8fSAnthony Liguori for (i = 0; i < s->max_table_entries; i++) { 261019d6b8fSAnthony Liguori be32_to_cpus(&s->pagetable[i]); 262019d6b8fSAnthony Liguori if (s->pagetable[i] != 0xFFFFFFFF) { 263019d6b8fSAnthony Liguori int64_t next = (512 * (int64_t) s->pagetable[i]) + 264019d6b8fSAnthony Liguori s->bitmap_size + s->block_size; 265019d6b8fSAnthony Liguori 26624da78dbSCharles Arnold if (next > s->free_data_block_offset) { 267019d6b8fSAnthony Liguori s->free_data_block_offset = next; 268019d6b8fSAnthony Liguori } 269019d6b8fSAnthony Liguori } 27024da78dbSCharles Arnold } 271019d6b8fSAnthony Liguori 272fb8fe35fSPeter Lieven if (s->free_data_block_offset > bdrv_getlength(bs->file)) { 273fb8fe35fSPeter Lieven error_setg(errp, "block-vpc: free_data_block_offset points after " 274fb8fe35fSPeter Lieven "the end of file. The image has been truncated."); 275fb8fe35fSPeter Lieven ret = -EINVAL; 276fb8fe35fSPeter Lieven goto fail; 277fb8fe35fSPeter Lieven } 278fb8fe35fSPeter Lieven 279019d6b8fSAnthony Liguori s->last_bitmap_offset = (int64_t) -1; 280019d6b8fSAnthony Liguori 281019d6b8fSAnthony Liguori #ifdef CACHE 2827267c094SAnthony Liguori s->pageentry_u8 = g_malloc(512); 283019d6b8fSAnthony Liguori s->pageentry_u32 = s->pageentry_u8; 284019d6b8fSAnthony Liguori s->pageentry_u16 = s->pageentry_u8; 285019d6b8fSAnthony Liguori s->last_pagetable = -1; 286019d6b8fSAnthony Liguori #endif 28724da78dbSCharles Arnold } 288019d6b8fSAnthony Liguori 289848c66e8SPaolo Bonzini qemu_co_mutex_init(&s->lock); 290612ff3d8SKevin Wolf 291612ff3d8SKevin Wolf /* Disable migration when VHD images are used */ 292612ff3d8SKevin Wolf error_set(&s->migration_blocker, 293612ff3d8SKevin Wolf QERR_BLOCK_FORMAT_FEATURE_NOT_SUPPORTED, 294612ff3d8SKevin Wolf "vpc", bs->device_name, "live migration"); 295612ff3d8SKevin Wolf migrate_add_blocker(s->migration_blocker); 296612ff3d8SKevin Wolf 297019d6b8fSAnthony Liguori return 0; 29859294e46SKevin Wolf 299019d6b8fSAnthony Liguori fail: 30059294e46SKevin Wolf g_free(s->pagetable); 30159294e46SKevin Wolf #ifdef CACHE 30259294e46SKevin Wolf g_free(s->pageentry_u8); 30359294e46SKevin Wolf #endif 30459294e46SKevin Wolf return ret; 305019d6b8fSAnthony Liguori } 306019d6b8fSAnthony Liguori 3073fe4b700SJeff Cody static int vpc_reopen_prepare(BDRVReopenState *state, 3083fe4b700SJeff Cody BlockReopenQueue *queue, Error **errp) 3093fe4b700SJeff Cody { 3103fe4b700SJeff Cody return 0; 3113fe4b700SJeff Cody } 3123fe4b700SJeff Cody 313019d6b8fSAnthony Liguori /* 314019d6b8fSAnthony Liguori * Returns the absolute byte offset of the given sector in the image file. 315019d6b8fSAnthony Liguori * If the sector is not allocated, -1 is returned instead. 316019d6b8fSAnthony Liguori * 317019d6b8fSAnthony Liguori * The parameter write must be 1 if the offset will be used for a write 318019d6b8fSAnthony Liguori * operation (the block bitmaps is updated then), 0 otherwise. 319019d6b8fSAnthony Liguori */ 320019d6b8fSAnthony Liguori static inline int64_t get_sector_offset(BlockDriverState *bs, 321019d6b8fSAnthony Liguori int64_t sector_num, int write) 322019d6b8fSAnthony Liguori { 323019d6b8fSAnthony Liguori BDRVVPCState *s = bs->opaque; 324019d6b8fSAnthony Liguori uint64_t offset = sector_num * 512; 325019d6b8fSAnthony Liguori uint64_t bitmap_offset, block_offset; 326019d6b8fSAnthony Liguori uint32_t pagetable_index, pageentry_index; 327019d6b8fSAnthony Liguori 328019d6b8fSAnthony Liguori pagetable_index = offset / s->block_size; 329019d6b8fSAnthony Liguori pageentry_index = (offset % s->block_size) / 512; 330019d6b8fSAnthony Liguori 331019d6b8fSAnthony Liguori if (pagetable_index >= s->max_table_entries || s->pagetable[pagetable_index] == 0xffffffff) 332019d6b8fSAnthony Liguori return -1; // not allocated 333019d6b8fSAnthony Liguori 334019d6b8fSAnthony Liguori bitmap_offset = 512 * (uint64_t) s->pagetable[pagetable_index]; 335019d6b8fSAnthony Liguori block_offset = bitmap_offset + s->bitmap_size + (512 * pageentry_index); 336019d6b8fSAnthony Liguori 337019d6b8fSAnthony Liguori // We must ensure that we don't write to any sectors which are marked as 338019d6b8fSAnthony Liguori // unused in the bitmap. We get away with setting all bits in the block 339019d6b8fSAnthony Liguori // bitmap each time we write to a new block. This might cause Virtual PC to 340019d6b8fSAnthony Liguori // miss sparse read optimization, but it's not a problem in terms of 341019d6b8fSAnthony Liguori // correctness. 342019d6b8fSAnthony Liguori if (write && (s->last_bitmap_offset != bitmap_offset)) { 343019d6b8fSAnthony Liguori uint8_t bitmap[s->bitmap_size]; 344019d6b8fSAnthony Liguori 345019d6b8fSAnthony Liguori s->last_bitmap_offset = bitmap_offset; 346019d6b8fSAnthony Liguori memset(bitmap, 0xff, s->bitmap_size); 347078a458eSKevin Wolf bdrv_pwrite_sync(bs->file, bitmap_offset, bitmap, s->bitmap_size); 348019d6b8fSAnthony Liguori } 349019d6b8fSAnthony Liguori 350019d6b8fSAnthony Liguori // printf("sector: %" PRIx64 ", index: %x, offset: %x, bioff: %" PRIx64 ", bloff: %" PRIx64 "\n", 351019d6b8fSAnthony Liguori // sector_num, pagetable_index, pageentry_index, 352019d6b8fSAnthony Liguori // bitmap_offset, block_offset); 353019d6b8fSAnthony Liguori 354019d6b8fSAnthony Liguori // disabled by reason 355019d6b8fSAnthony Liguori #if 0 356019d6b8fSAnthony Liguori #ifdef CACHE 357019d6b8fSAnthony Liguori if (bitmap_offset != s->last_bitmap) 358019d6b8fSAnthony Liguori { 359019d6b8fSAnthony Liguori lseek(s->fd, bitmap_offset, SEEK_SET); 360019d6b8fSAnthony Liguori 361019d6b8fSAnthony Liguori s->last_bitmap = bitmap_offset; 362019d6b8fSAnthony Liguori 363019d6b8fSAnthony Liguori // Scary! Bitmap is stored as big endian 32bit entries, 364019d6b8fSAnthony Liguori // while we used to look it up byte by byte 365019d6b8fSAnthony Liguori read(s->fd, s->pageentry_u8, 512); 366019d6b8fSAnthony Liguori for (i = 0; i < 128; i++) 367019d6b8fSAnthony Liguori be32_to_cpus(&s->pageentry_u32[i]); 368019d6b8fSAnthony Liguori } 369019d6b8fSAnthony Liguori 370019d6b8fSAnthony Liguori if ((s->pageentry_u8[pageentry_index / 8] >> (pageentry_index % 8)) & 1) 371019d6b8fSAnthony Liguori return -1; 372019d6b8fSAnthony Liguori #else 373019d6b8fSAnthony Liguori lseek(s->fd, bitmap_offset + (pageentry_index / 8), SEEK_SET); 374019d6b8fSAnthony Liguori 375019d6b8fSAnthony Liguori read(s->fd, &bitmap_entry, 1); 376019d6b8fSAnthony Liguori 377019d6b8fSAnthony Liguori if ((bitmap_entry >> (pageentry_index % 8)) & 1) 378019d6b8fSAnthony Liguori return -1; // not allocated 379019d6b8fSAnthony Liguori #endif 380019d6b8fSAnthony Liguori #endif 381019d6b8fSAnthony Liguori 382019d6b8fSAnthony Liguori return block_offset; 383019d6b8fSAnthony Liguori } 384019d6b8fSAnthony Liguori 385019d6b8fSAnthony Liguori /* 386019d6b8fSAnthony Liguori * Writes the footer to the end of the image file. This is needed when the 387019d6b8fSAnthony Liguori * file grows as it overwrites the old footer 388019d6b8fSAnthony Liguori * 389019d6b8fSAnthony Liguori * Returns 0 on success and < 0 on error 390019d6b8fSAnthony Liguori */ 391019d6b8fSAnthony Liguori static int rewrite_footer(BlockDriverState* bs) 392019d6b8fSAnthony Liguori { 393019d6b8fSAnthony Liguori int ret; 394019d6b8fSAnthony Liguori BDRVVPCState *s = bs->opaque; 395019d6b8fSAnthony Liguori int64_t offset = s->free_data_block_offset; 396019d6b8fSAnthony Liguori 397078a458eSKevin Wolf ret = bdrv_pwrite_sync(bs->file, offset, s->footer_buf, HEADER_SIZE); 398019d6b8fSAnthony Liguori if (ret < 0) 399019d6b8fSAnthony Liguori return ret; 400019d6b8fSAnthony Liguori 401019d6b8fSAnthony Liguori return 0; 402019d6b8fSAnthony Liguori } 403019d6b8fSAnthony Liguori 404019d6b8fSAnthony Liguori /* 405019d6b8fSAnthony Liguori * Allocates a new block. This involves writing a new footer and updating 406019d6b8fSAnthony Liguori * the Block Allocation Table to use the space at the old end of the image 407019d6b8fSAnthony Liguori * file (overwriting the old footer) 408019d6b8fSAnthony Liguori * 409019d6b8fSAnthony Liguori * Returns the sectors' offset in the image file on success and < 0 on error 410019d6b8fSAnthony Liguori */ 411019d6b8fSAnthony Liguori static int64_t alloc_block(BlockDriverState* bs, int64_t sector_num) 412019d6b8fSAnthony Liguori { 413019d6b8fSAnthony Liguori BDRVVPCState *s = bs->opaque; 414019d6b8fSAnthony Liguori int64_t bat_offset; 415019d6b8fSAnthony Liguori uint32_t index, bat_value; 416019d6b8fSAnthony Liguori int ret; 417019d6b8fSAnthony Liguori uint8_t bitmap[s->bitmap_size]; 418019d6b8fSAnthony Liguori 419019d6b8fSAnthony Liguori // Check if sector_num is valid 420019d6b8fSAnthony Liguori if ((sector_num < 0) || (sector_num > bs->total_sectors)) 421019d6b8fSAnthony Liguori return -1; 422019d6b8fSAnthony Liguori 423019d6b8fSAnthony Liguori // Write entry into in-memory BAT 424019d6b8fSAnthony Liguori index = (sector_num * 512) / s->block_size; 425019d6b8fSAnthony Liguori if (s->pagetable[index] != 0xFFFFFFFF) 426019d6b8fSAnthony Liguori return -1; 427019d6b8fSAnthony Liguori 428019d6b8fSAnthony Liguori s->pagetable[index] = s->free_data_block_offset / 512; 429019d6b8fSAnthony Liguori 430019d6b8fSAnthony Liguori // Initialize the block's bitmap 431019d6b8fSAnthony Liguori memset(bitmap, 0xff, s->bitmap_size); 4325bb1cbacSKevin Wolf ret = bdrv_pwrite_sync(bs->file, s->free_data_block_offset, bitmap, 433078a458eSKevin Wolf s->bitmap_size); 4345bb1cbacSKevin Wolf if (ret < 0) { 4355bb1cbacSKevin Wolf return ret; 4365bb1cbacSKevin Wolf } 437019d6b8fSAnthony Liguori 438019d6b8fSAnthony Liguori // Write new footer (the old one will be overwritten) 439019d6b8fSAnthony Liguori s->free_data_block_offset += s->block_size + s->bitmap_size; 440019d6b8fSAnthony Liguori ret = rewrite_footer(bs); 441019d6b8fSAnthony Liguori if (ret < 0) 442019d6b8fSAnthony Liguori goto fail; 443019d6b8fSAnthony Liguori 444019d6b8fSAnthony Liguori // Write BAT entry to disk 445019d6b8fSAnthony Liguori bat_offset = s->bat_offset + (4 * index); 446019d6b8fSAnthony Liguori bat_value = be32_to_cpu(s->pagetable[index]); 447078a458eSKevin Wolf ret = bdrv_pwrite_sync(bs->file, bat_offset, &bat_value, 4); 448019d6b8fSAnthony Liguori if (ret < 0) 449019d6b8fSAnthony Liguori goto fail; 450019d6b8fSAnthony Liguori 451019d6b8fSAnthony Liguori return get_sector_offset(bs, sector_num, 0); 452019d6b8fSAnthony Liguori 453019d6b8fSAnthony Liguori fail: 454019d6b8fSAnthony Liguori s->free_data_block_offset -= (s->block_size + s->bitmap_size); 455019d6b8fSAnthony Liguori return -1; 456019d6b8fSAnthony Liguori } 457019d6b8fSAnthony Liguori 45897b00e28SPaolo Bonzini static int vpc_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) 45997b00e28SPaolo Bonzini { 46097b00e28SPaolo Bonzini BDRVVPCState *s = (BDRVVPCState *)bs->opaque; 46197b00e28SPaolo Bonzini VHDFooter *footer = (VHDFooter *) s->footer_buf; 46297b00e28SPaolo Bonzini 46397b00e28SPaolo Bonzini if (cpu_to_be32(footer->type) != VHD_FIXED) { 46497b00e28SPaolo Bonzini bdi->cluster_size = s->block_size; 46597b00e28SPaolo Bonzini } 46697b00e28SPaolo Bonzini 467*95de6d70SPaolo Bonzini bdi->unallocated_blocks_are_zero = true; 46897b00e28SPaolo Bonzini return 0; 46997b00e28SPaolo Bonzini } 47097b00e28SPaolo Bonzini 471019d6b8fSAnthony Liguori static int vpc_read(BlockDriverState *bs, int64_t sector_num, 472019d6b8fSAnthony Liguori uint8_t *buf, int nb_sectors) 473019d6b8fSAnthony Liguori { 4746c6ea921SKevin Wolf BDRVVPCState *s = bs->opaque; 475019d6b8fSAnthony Liguori int ret; 476019d6b8fSAnthony Liguori int64_t offset; 4776c6ea921SKevin Wolf int64_t sectors, sectors_per_block; 478e54835c0SJeff Cody VHDFooter *footer = (VHDFooter *) s->footer_buf; 479019d6b8fSAnthony Liguori 48024da78dbSCharles Arnold if (cpu_to_be32(footer->type) == VHD_FIXED) { 48124da78dbSCharles Arnold return bdrv_read(bs->file, sector_num, buf, nb_sectors); 48224da78dbSCharles Arnold } 483019d6b8fSAnthony Liguori while (nb_sectors > 0) { 484019d6b8fSAnthony Liguori offset = get_sector_offset(bs, sector_num, 0); 485019d6b8fSAnthony Liguori 4866c6ea921SKevin Wolf sectors_per_block = s->block_size >> BDRV_SECTOR_BITS; 4876c6ea921SKevin Wolf sectors = sectors_per_block - (sector_num % sectors_per_block); 4886c6ea921SKevin Wolf if (sectors > nb_sectors) { 4896c6ea921SKevin Wolf sectors = nb_sectors; 490019d6b8fSAnthony Liguori } 491019d6b8fSAnthony Liguori 4926c6ea921SKevin Wolf if (offset == -1) { 4936c6ea921SKevin Wolf memset(buf, 0, sectors * BDRV_SECTOR_SIZE); 4946c6ea921SKevin Wolf } else { 4956c6ea921SKevin Wolf ret = bdrv_pread(bs->file, offset, buf, 4966c6ea921SKevin Wolf sectors * BDRV_SECTOR_SIZE); 4976c6ea921SKevin Wolf if (ret != sectors * BDRV_SECTOR_SIZE) { 4986c6ea921SKevin Wolf return -1; 4996c6ea921SKevin Wolf } 5006c6ea921SKevin Wolf } 5016c6ea921SKevin Wolf 5026c6ea921SKevin Wolf nb_sectors -= sectors; 5036c6ea921SKevin Wolf sector_num += sectors; 5046c6ea921SKevin Wolf buf += sectors * BDRV_SECTOR_SIZE; 505019d6b8fSAnthony Liguori } 506019d6b8fSAnthony Liguori return 0; 507019d6b8fSAnthony Liguori } 508019d6b8fSAnthony Liguori 5092914caa0SPaolo Bonzini static coroutine_fn int vpc_co_read(BlockDriverState *bs, int64_t sector_num, 5102914caa0SPaolo Bonzini uint8_t *buf, int nb_sectors) 5112914caa0SPaolo Bonzini { 5122914caa0SPaolo Bonzini int ret; 5132914caa0SPaolo Bonzini BDRVVPCState *s = bs->opaque; 5142914caa0SPaolo Bonzini qemu_co_mutex_lock(&s->lock); 5152914caa0SPaolo Bonzini ret = vpc_read(bs, sector_num, buf, nb_sectors); 5162914caa0SPaolo Bonzini qemu_co_mutex_unlock(&s->lock); 5172914caa0SPaolo Bonzini return ret; 5182914caa0SPaolo Bonzini } 5192914caa0SPaolo Bonzini 520019d6b8fSAnthony Liguori static int vpc_write(BlockDriverState *bs, int64_t sector_num, 521019d6b8fSAnthony Liguori const uint8_t *buf, int nb_sectors) 522019d6b8fSAnthony Liguori { 5236c6ea921SKevin Wolf BDRVVPCState *s = bs->opaque; 524019d6b8fSAnthony Liguori int64_t offset; 5256c6ea921SKevin Wolf int64_t sectors, sectors_per_block; 526019d6b8fSAnthony Liguori int ret; 527e54835c0SJeff Cody VHDFooter *footer = (VHDFooter *) s->footer_buf; 528019d6b8fSAnthony Liguori 52924da78dbSCharles Arnold if (cpu_to_be32(footer->type) == VHD_FIXED) { 53024da78dbSCharles Arnold return bdrv_write(bs->file, sector_num, buf, nb_sectors); 53124da78dbSCharles Arnold } 532019d6b8fSAnthony Liguori while (nb_sectors > 0) { 533019d6b8fSAnthony Liguori offset = get_sector_offset(bs, sector_num, 1); 534019d6b8fSAnthony Liguori 5356c6ea921SKevin Wolf sectors_per_block = s->block_size >> BDRV_SECTOR_BITS; 5366c6ea921SKevin Wolf sectors = sectors_per_block - (sector_num % sectors_per_block); 5376c6ea921SKevin Wolf if (sectors > nb_sectors) { 5386c6ea921SKevin Wolf sectors = nb_sectors; 5396c6ea921SKevin Wolf } 5406c6ea921SKevin Wolf 541019d6b8fSAnthony Liguori if (offset == -1) { 542019d6b8fSAnthony Liguori offset = alloc_block(bs, sector_num); 543019d6b8fSAnthony Liguori if (offset < 0) 544019d6b8fSAnthony Liguori return -1; 545019d6b8fSAnthony Liguori } 546019d6b8fSAnthony Liguori 5476c6ea921SKevin Wolf ret = bdrv_pwrite(bs->file, offset, buf, sectors * BDRV_SECTOR_SIZE); 5486c6ea921SKevin Wolf if (ret != sectors * BDRV_SECTOR_SIZE) { 549019d6b8fSAnthony Liguori return -1; 5506c6ea921SKevin Wolf } 551019d6b8fSAnthony Liguori 5526c6ea921SKevin Wolf nb_sectors -= sectors; 5536c6ea921SKevin Wolf sector_num += sectors; 5546c6ea921SKevin Wolf buf += sectors * BDRV_SECTOR_SIZE; 555019d6b8fSAnthony Liguori } 556019d6b8fSAnthony Liguori 557019d6b8fSAnthony Liguori return 0; 558019d6b8fSAnthony Liguori } 559019d6b8fSAnthony Liguori 560e183ef75SPaolo Bonzini static coroutine_fn int vpc_co_write(BlockDriverState *bs, int64_t sector_num, 561e183ef75SPaolo Bonzini const uint8_t *buf, int nb_sectors) 562e183ef75SPaolo Bonzini { 563e183ef75SPaolo Bonzini int ret; 564e183ef75SPaolo Bonzini BDRVVPCState *s = bs->opaque; 565e183ef75SPaolo Bonzini qemu_co_mutex_lock(&s->lock); 566e183ef75SPaolo Bonzini ret = vpc_write(bs, sector_num, buf, nb_sectors); 567e183ef75SPaolo Bonzini qemu_co_mutex_unlock(&s->lock); 568e183ef75SPaolo Bonzini return ret; 569e183ef75SPaolo Bonzini } 570e183ef75SPaolo Bonzini 571019d6b8fSAnthony Liguori /* 572019d6b8fSAnthony Liguori * Calculates the number of cylinders, heads and sectors per cylinder 573019d6b8fSAnthony Liguori * based on a given number of sectors. This is the algorithm described 574019d6b8fSAnthony Liguori * in the VHD specification. 575019d6b8fSAnthony Liguori * 576019d6b8fSAnthony Liguori * Note that the geometry doesn't always exactly match total_sectors but 577019d6b8fSAnthony Liguori * may round it down. 578019d6b8fSAnthony Liguori * 579258d2edbSCharles Arnold * Returns 0 on success, -EFBIG if the size is larger than ~2 TB. Override 580258d2edbSCharles Arnold * the hardware EIDE and ATA-2 limit of 16 heads (max disk size of 127 GB) 581258d2edbSCharles Arnold * and instead allow up to 255 heads. 582019d6b8fSAnthony Liguori */ 583019d6b8fSAnthony Liguori static int calculate_geometry(int64_t total_sectors, uint16_t* cyls, 584019d6b8fSAnthony Liguori uint8_t* heads, uint8_t* secs_per_cyl) 585019d6b8fSAnthony Liguori { 586019d6b8fSAnthony Liguori uint32_t cyls_times_heads; 587019d6b8fSAnthony Liguori 588258d2edbSCharles Arnold /* Allow a maximum disk size of approximately 2 TB */ 589258d2edbSCharles Arnold if (total_sectors > 65535LL * 255 * 255) { 590019d6b8fSAnthony Liguori return -EFBIG; 591258d2edbSCharles Arnold } 592019d6b8fSAnthony Liguori 593019d6b8fSAnthony Liguori if (total_sectors > 65535 * 16 * 63) { 594019d6b8fSAnthony Liguori *secs_per_cyl = 255; 595258d2edbSCharles Arnold if (total_sectors > 65535 * 16 * 255) { 596258d2edbSCharles Arnold *heads = 255; 597258d2edbSCharles Arnold } else { 598019d6b8fSAnthony Liguori *heads = 16; 599258d2edbSCharles Arnold } 600019d6b8fSAnthony Liguori cyls_times_heads = total_sectors / *secs_per_cyl; 601019d6b8fSAnthony Liguori } else { 602019d6b8fSAnthony Liguori *secs_per_cyl = 17; 603019d6b8fSAnthony Liguori cyls_times_heads = total_sectors / *secs_per_cyl; 604019d6b8fSAnthony Liguori *heads = (cyls_times_heads + 1023) / 1024; 605019d6b8fSAnthony Liguori 606019d6b8fSAnthony Liguori if (*heads < 4) 607019d6b8fSAnthony Liguori *heads = 4; 608019d6b8fSAnthony Liguori 609019d6b8fSAnthony Liguori if (cyls_times_heads >= (*heads * 1024) || *heads > 16) { 610019d6b8fSAnthony Liguori *secs_per_cyl = 31; 611019d6b8fSAnthony Liguori *heads = 16; 612019d6b8fSAnthony Liguori cyls_times_heads = total_sectors / *secs_per_cyl; 613019d6b8fSAnthony Liguori } 614019d6b8fSAnthony Liguori 615019d6b8fSAnthony Liguori if (cyls_times_heads >= (*heads * 1024)) { 616019d6b8fSAnthony Liguori *secs_per_cyl = 63; 617019d6b8fSAnthony Liguori *heads = 16; 618019d6b8fSAnthony Liguori cyls_times_heads = total_sectors / *secs_per_cyl; 619019d6b8fSAnthony Liguori } 620019d6b8fSAnthony Liguori } 621019d6b8fSAnthony Liguori 622dede4188SStefan Weil *cyls = cyls_times_heads / *heads; 623019d6b8fSAnthony Liguori 624019d6b8fSAnthony Liguori return 0; 625019d6b8fSAnthony Liguori } 626019d6b8fSAnthony Liguori 62724da78dbSCharles Arnold static int create_dynamic_disk(int fd, uint8_t *buf, int64_t total_sectors) 628019d6b8fSAnthony Liguori { 629e54835c0SJeff Cody VHDDynDiskHeader *dyndisk_header = 630e54835c0SJeff Cody (VHDDynDiskHeader *) buf; 631019d6b8fSAnthony Liguori size_t block_size, num_bat_entries; 63224da78dbSCharles Arnold int i; 633f0ff243aSBlue Swirl int ret = -EIO; 634019d6b8fSAnthony Liguori 635019d6b8fSAnthony Liguori // Write the footer (twice: at the beginning and at the end) 636019d6b8fSAnthony Liguori block_size = 0x200000; 637019d6b8fSAnthony Liguori num_bat_entries = (total_sectors + block_size / 512) / (block_size / 512); 638019d6b8fSAnthony Liguori 639f0ff243aSBlue Swirl if (write(fd, buf, HEADER_SIZE) != HEADER_SIZE) { 640f0ff243aSBlue Swirl goto fail; 641f0ff243aSBlue Swirl } 642019d6b8fSAnthony Liguori 643f0ff243aSBlue Swirl if (lseek(fd, 1536 + ((num_bat_entries * 4 + 511) & ~511), SEEK_SET) < 0) { 644f0ff243aSBlue Swirl goto fail; 645f0ff243aSBlue Swirl } 646f0ff243aSBlue Swirl if (write(fd, buf, HEADER_SIZE) != HEADER_SIZE) { 647f0ff243aSBlue Swirl goto fail; 648f0ff243aSBlue Swirl } 649019d6b8fSAnthony Liguori 650019d6b8fSAnthony Liguori // Write the initial BAT 651f0ff243aSBlue Swirl if (lseek(fd, 3 * 512, SEEK_SET) < 0) { 652f0ff243aSBlue Swirl goto fail; 653f0ff243aSBlue Swirl } 654019d6b8fSAnthony Liguori 655019d6b8fSAnthony Liguori memset(buf, 0xFF, 512); 656f0ff243aSBlue Swirl for (i = 0; i < (num_bat_entries * 4 + 511) / 512; i++) { 657f0ff243aSBlue Swirl if (write(fd, buf, 512) != 512) { 658f0ff243aSBlue Swirl goto fail; 659f0ff243aSBlue Swirl } 660f0ff243aSBlue Swirl } 661019d6b8fSAnthony Liguori 662019d6b8fSAnthony Liguori // Prepare the Dynamic Disk Header 663019d6b8fSAnthony Liguori memset(buf, 0, 1024); 664019d6b8fSAnthony Liguori 6655ec4d682SNathan Froyd memcpy(dyndisk_header->magic, "cxsparse", 8); 666019d6b8fSAnthony Liguori 66778439f6aSCharles Arnold /* 66878439f6aSCharles Arnold * Note: The spec is actually wrong here for data_offset, it says 66978439f6aSCharles Arnold * 0xFFFFFFFF, but MS tools expect all 64 bits to be set. 67078439f6aSCharles Arnold */ 67178439f6aSCharles Arnold dyndisk_header->data_offset = be64_to_cpu(0xFFFFFFFFFFFFFFFFULL); 672019d6b8fSAnthony Liguori dyndisk_header->table_offset = be64_to_cpu(3 * 512); 673019d6b8fSAnthony Liguori dyndisk_header->version = be32_to_cpu(0x00010000); 674019d6b8fSAnthony Liguori dyndisk_header->block_size = be32_to_cpu(block_size); 675019d6b8fSAnthony Liguori dyndisk_header->max_table_entries = be32_to_cpu(num_bat_entries); 676019d6b8fSAnthony Liguori 677019d6b8fSAnthony Liguori dyndisk_header->checksum = be32_to_cpu(vpc_checksum(buf, 1024)); 678019d6b8fSAnthony Liguori 679019d6b8fSAnthony Liguori // Write the header 680f0ff243aSBlue Swirl if (lseek(fd, 512, SEEK_SET) < 0) { 681f0ff243aSBlue Swirl goto fail; 682f0ff243aSBlue Swirl } 683019d6b8fSAnthony Liguori 684f0ff243aSBlue Swirl if (write(fd, buf, 1024) != 1024) { 685f0ff243aSBlue Swirl goto fail; 686f0ff243aSBlue Swirl } 687f0ff243aSBlue Swirl ret = 0; 688f0ff243aSBlue Swirl 689f0ff243aSBlue Swirl fail: 69024da78dbSCharles Arnold return ret; 69124da78dbSCharles Arnold } 69224da78dbSCharles Arnold 69324da78dbSCharles Arnold static int create_fixed_disk(int fd, uint8_t *buf, int64_t total_size) 69424da78dbSCharles Arnold { 69524da78dbSCharles Arnold int ret = -EIO; 69624da78dbSCharles Arnold 69724da78dbSCharles Arnold /* Add footer to total size */ 69824da78dbSCharles Arnold total_size += 512; 69924da78dbSCharles Arnold if (ftruncate(fd, total_size) != 0) { 70024da78dbSCharles Arnold ret = -errno; 70124da78dbSCharles Arnold goto fail; 70224da78dbSCharles Arnold } 70324da78dbSCharles Arnold if (lseek(fd, -512, SEEK_END) < 0) { 70424da78dbSCharles Arnold goto fail; 70524da78dbSCharles Arnold } 70624da78dbSCharles Arnold if (write(fd, buf, HEADER_SIZE) != HEADER_SIZE) { 70724da78dbSCharles Arnold goto fail; 70824da78dbSCharles Arnold } 70924da78dbSCharles Arnold 71024da78dbSCharles Arnold ret = 0; 71124da78dbSCharles Arnold 71224da78dbSCharles Arnold fail: 71324da78dbSCharles Arnold return ret; 71424da78dbSCharles Arnold } 71524da78dbSCharles Arnold 716d5124c00SMax Reitz static int vpc_create(const char *filename, QEMUOptionParameter *options, 717d5124c00SMax Reitz Error **errp) 71824da78dbSCharles Arnold { 71924da78dbSCharles Arnold uint8_t buf[1024]; 720e54835c0SJeff Cody VHDFooter *footer = (VHDFooter *) buf; 72124da78dbSCharles Arnold QEMUOptionParameter *disk_type_param; 72224da78dbSCharles Arnold int fd, i; 72324da78dbSCharles Arnold uint16_t cyls = 0; 72424da78dbSCharles Arnold uint8_t heads = 0; 72524da78dbSCharles Arnold uint8_t secs_per_cyl = 0; 72624da78dbSCharles Arnold int64_t total_sectors; 72724da78dbSCharles Arnold int64_t total_size; 72824da78dbSCharles Arnold int disk_type; 72924da78dbSCharles Arnold int ret = -EIO; 73024da78dbSCharles Arnold 73124da78dbSCharles Arnold /* Read out options */ 73224da78dbSCharles Arnold total_size = get_option_parameter(options, BLOCK_OPT_SIZE)->value.n; 73324da78dbSCharles Arnold 73424da78dbSCharles Arnold disk_type_param = get_option_parameter(options, BLOCK_OPT_SUBFMT); 73524da78dbSCharles Arnold if (disk_type_param && disk_type_param->value.s) { 73624da78dbSCharles Arnold if (!strcmp(disk_type_param->value.s, "dynamic")) { 73724da78dbSCharles Arnold disk_type = VHD_DYNAMIC; 73824da78dbSCharles Arnold } else if (!strcmp(disk_type_param->value.s, "fixed")) { 73924da78dbSCharles Arnold disk_type = VHD_FIXED; 74024da78dbSCharles Arnold } else { 74124da78dbSCharles Arnold return -EINVAL; 74224da78dbSCharles Arnold } 74324da78dbSCharles Arnold } else { 74424da78dbSCharles Arnold disk_type = VHD_DYNAMIC; 74524da78dbSCharles Arnold } 74624da78dbSCharles Arnold 74724da78dbSCharles Arnold /* Create the file */ 7486165f4d8SCorey Bryant fd = qemu_open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY, 0644); 74924da78dbSCharles Arnold if (fd < 0) { 75024da78dbSCharles Arnold return -EIO; 75124da78dbSCharles Arnold } 75224da78dbSCharles Arnold 753ecd880d9SKevin Wolf /* 754ecd880d9SKevin Wolf * Calculate matching total_size and geometry. Increase the number of 755ecd880d9SKevin Wolf * sectors requested until we get enough (or fail). This ensures that 756ecd880d9SKevin Wolf * qemu-img convert doesn't truncate images, but rather rounds up. 757ecd880d9SKevin Wolf */ 75824da78dbSCharles Arnold total_sectors = total_size / BDRV_SECTOR_SIZE; 759ecd880d9SKevin Wolf for (i = 0; total_sectors > (int64_t)cyls * heads * secs_per_cyl; i++) { 760ecd880d9SKevin Wolf if (calculate_geometry(total_sectors + i, &cyls, &heads, 761ecd880d9SKevin Wolf &secs_per_cyl)) 762ecd880d9SKevin Wolf { 76324da78dbSCharles Arnold ret = -EFBIG; 76424da78dbSCharles Arnold goto fail; 76524da78dbSCharles Arnold } 76624da78dbSCharles Arnold } 767ecd880d9SKevin Wolf 76824da78dbSCharles Arnold total_sectors = (int64_t) cyls * heads * secs_per_cyl; 76924da78dbSCharles Arnold 77024da78dbSCharles Arnold /* Prepare the Hard Disk Footer */ 77124da78dbSCharles Arnold memset(buf, 0, 1024); 77224da78dbSCharles Arnold 77324da78dbSCharles Arnold memcpy(footer->creator, "conectix", 8); 77424da78dbSCharles Arnold /* TODO Check if "qemu" creator_app is ok for VPC */ 77524da78dbSCharles Arnold memcpy(footer->creator_app, "qemu", 4); 77624da78dbSCharles Arnold memcpy(footer->creator_os, "Wi2k", 4); 77724da78dbSCharles Arnold 77824da78dbSCharles Arnold footer->features = be32_to_cpu(0x02); 77924da78dbSCharles Arnold footer->version = be32_to_cpu(0x00010000); 78024da78dbSCharles Arnold if (disk_type == VHD_DYNAMIC) { 78124da78dbSCharles Arnold footer->data_offset = be64_to_cpu(HEADER_SIZE); 78224da78dbSCharles Arnold } else { 78324da78dbSCharles Arnold footer->data_offset = be64_to_cpu(0xFFFFFFFFFFFFFFFFULL); 78424da78dbSCharles Arnold } 78524da78dbSCharles Arnold footer->timestamp = be32_to_cpu(time(NULL) - VHD_TIMESTAMP_BASE); 78624da78dbSCharles Arnold 78724da78dbSCharles Arnold /* Version of Virtual PC 2007 */ 78824da78dbSCharles Arnold footer->major = be16_to_cpu(0x0005); 78924da78dbSCharles Arnold footer->minor = be16_to_cpu(0x0003); 79024da78dbSCharles Arnold if (disk_type == VHD_DYNAMIC) { 79124da78dbSCharles Arnold footer->orig_size = be64_to_cpu(total_sectors * 512); 79224da78dbSCharles Arnold footer->size = be64_to_cpu(total_sectors * 512); 79324da78dbSCharles Arnold } else { 79424da78dbSCharles Arnold footer->orig_size = be64_to_cpu(total_size); 79524da78dbSCharles Arnold footer->size = be64_to_cpu(total_size); 79624da78dbSCharles Arnold } 79724da78dbSCharles Arnold footer->cyls = be16_to_cpu(cyls); 79824da78dbSCharles Arnold footer->heads = heads; 79924da78dbSCharles Arnold footer->secs_per_cyl = secs_per_cyl; 80024da78dbSCharles Arnold 80124da78dbSCharles Arnold footer->type = be32_to_cpu(disk_type); 80224da78dbSCharles Arnold 8031fe1fa51SCharles Arnold #if defined(CONFIG_UUID) 8041fe1fa51SCharles Arnold uuid_generate(footer->uuid); 8051fe1fa51SCharles Arnold #endif 80624da78dbSCharles Arnold 80724da78dbSCharles Arnold footer->checksum = be32_to_cpu(vpc_checksum(buf, HEADER_SIZE)); 80824da78dbSCharles Arnold 80924da78dbSCharles Arnold if (disk_type == VHD_DYNAMIC) { 81024da78dbSCharles Arnold ret = create_dynamic_disk(fd, buf, total_sectors); 81124da78dbSCharles Arnold } else { 81224da78dbSCharles Arnold ret = create_fixed_disk(fd, buf, total_size); 81324da78dbSCharles Arnold } 81424da78dbSCharles Arnold 81524da78dbSCharles Arnold fail: 8162e1e79daSCorey Bryant qemu_close(fd); 817f0ff243aSBlue Swirl return ret; 818019d6b8fSAnthony Liguori } 819019d6b8fSAnthony Liguori 82072c6cc94SKevin Wolf static int vpc_has_zero_init(BlockDriverState *bs) 82172c6cc94SKevin Wolf { 82272c6cc94SKevin Wolf BDRVVPCState *s = bs->opaque; 823e54835c0SJeff Cody VHDFooter *footer = (VHDFooter *) s->footer_buf; 82472c6cc94SKevin Wolf 82572c6cc94SKevin Wolf if (cpu_to_be32(footer->type) == VHD_FIXED) { 82672c6cc94SKevin Wolf return bdrv_has_zero_init(bs->file); 82772c6cc94SKevin Wolf } else { 82872c6cc94SKevin Wolf return 1; 82972c6cc94SKevin Wolf } 83072c6cc94SKevin Wolf } 83172c6cc94SKevin Wolf 832019d6b8fSAnthony Liguori static void vpc_close(BlockDriverState *bs) 833019d6b8fSAnthony Liguori { 834019d6b8fSAnthony Liguori BDRVVPCState *s = bs->opaque; 8357267c094SAnthony Liguori g_free(s->pagetable); 836019d6b8fSAnthony Liguori #ifdef CACHE 8377267c094SAnthony Liguori g_free(s->pageentry_u8); 838019d6b8fSAnthony Liguori #endif 839612ff3d8SKevin Wolf 840612ff3d8SKevin Wolf migrate_del_blocker(s->migration_blocker); 841612ff3d8SKevin Wolf error_free(s->migration_blocker); 842019d6b8fSAnthony Liguori } 843019d6b8fSAnthony Liguori 8440e7e1989SKevin Wolf static QEMUOptionParameter vpc_create_options[] = { 845db08adf5SKevin Wolf { 846db08adf5SKevin Wolf .name = BLOCK_OPT_SIZE, 847db08adf5SKevin Wolf .type = OPT_SIZE, 848db08adf5SKevin Wolf .help = "Virtual disk size" 849db08adf5SKevin Wolf }, 85024da78dbSCharles Arnold { 85124da78dbSCharles Arnold .name = BLOCK_OPT_SUBFMT, 85224da78dbSCharles Arnold .type = OPT_STRING, 85324da78dbSCharles Arnold .help = 85424da78dbSCharles Arnold "Type of virtual hard disk format. Supported formats are " 85524da78dbSCharles Arnold "{dynamic (default) | fixed} " 85624da78dbSCharles Arnold }, 8570e7e1989SKevin Wolf { NULL } 8580e7e1989SKevin Wolf }; 8590e7e1989SKevin Wolf 860019d6b8fSAnthony Liguori static BlockDriver bdrv_vpc = { 861019d6b8fSAnthony Liguori .format_name = "vpc", 862019d6b8fSAnthony Liguori .instance_size = sizeof(BDRVVPCState), 863c68b89acSKevin Wolf 864019d6b8fSAnthony Liguori .bdrv_probe = vpc_probe, 865019d6b8fSAnthony Liguori .bdrv_open = vpc_open, 866019d6b8fSAnthony Liguori .bdrv_close = vpc_close, 8673fe4b700SJeff Cody .bdrv_reopen_prepare = vpc_reopen_prepare, 868019d6b8fSAnthony Liguori .bdrv_create = vpc_create, 8690e7e1989SKevin Wolf 870c68b89acSKevin Wolf .bdrv_read = vpc_co_read, 871c68b89acSKevin Wolf .bdrv_write = vpc_co_write, 872c68b89acSKevin Wolf 87397b00e28SPaolo Bonzini .bdrv_get_info = vpc_get_info, 87497b00e28SPaolo Bonzini 8750e7e1989SKevin Wolf .create_options = vpc_create_options, 87672c6cc94SKevin Wolf .bdrv_has_zero_init = vpc_has_zero_init, 877019d6b8fSAnthony Liguori }; 878019d6b8fSAnthony Liguori 879019d6b8fSAnthony Liguori static void bdrv_vpc_init(void) 880019d6b8fSAnthony Liguori { 881019d6b8fSAnthony Liguori bdrv_register(&bdrv_vpc); 882019d6b8fSAnthony Liguori } 883019d6b8fSAnthony Liguori 884019d6b8fSAnthony Liguori block_init(bdrv_vpc_init); 885