Jeff Cody | e8d4e5f | 2013-04-29 14:48:18 -0400 | [diff] [blame] | 1 | /* |
| 2 | * Block driver for Hyper-V VHDX Images |
| 3 | * |
| 4 | * Copyright (c) 2013 Red Hat, Inc., |
| 5 | * |
| 6 | * Authors: |
| 7 | * Jeff Cody <jcody@redhat.com> |
| 8 | * |
Jeff Cody | 6e9d290 | 2013-10-30 10:44:38 -0400 | [diff] [blame] | 9 | * This is based on the "VHDX Format Specification v1.00", published 8/25/2012 |
Jeff Cody | e8d4e5f | 2013-04-29 14:48:18 -0400 | [diff] [blame] | 10 | * by Microsoft: |
Jeff Cody | 6e9d290 | 2013-10-30 10:44:38 -0400 | [diff] [blame] | 11 | * https://www.microsoft.com/en-us/download/details.aspx?id=34750 |
Jeff Cody | e8d4e5f | 2013-04-29 14:48:18 -0400 | [diff] [blame] | 12 | * |
| 13 | * This work is licensed under the terms of the GNU LGPL, version 2 or later. |
| 14 | * See the COPYING.LIB file in the top-level directory. |
| 15 | * |
| 16 | */ |
| 17 | |
Peter Maydell | 80c71a2 | 2016-01-18 18:01:42 +0000 | [diff] [blame] | 18 | #include "qemu/osdep.h" |
Markus Armbruster | da34e65 | 2016-03-14 09:01:28 +0100 | [diff] [blame] | 19 | #include "qapi/error.h" |
Jeff Cody | e8d4e5f | 2013-04-29 14:48:18 -0400 | [diff] [blame] | 20 | #include "qemu-common.h" |
| 21 | #include "block/block_int.h" |
Kevin Wolf | 10bf03a | 2016-03-08 15:57:05 +0100 | [diff] [blame] | 22 | #include "sysemu/block-backend.h" |
Jeff Cody | e8d4e5f | 2013-04-29 14:48:18 -0400 | [diff] [blame] | 23 | #include "qemu/module.h" |
| 24 | #include "qemu/crc32c.h" |
Paolo Bonzini | 58369e2 | 2016-03-15 17:22:36 +0100 | [diff] [blame] | 25 | #include "qemu/bswap.h" |
Jeff Cody | e8d4e5f | 2013-04-29 14:48:18 -0400 | [diff] [blame] | 26 | #include "block/vhdx.h" |
Jeff Cody | 5641bf4 | 2013-10-01 11:59:20 -0400 | [diff] [blame] | 27 | #include "migration/migration.h" |
Fam Zheng | cb6414d | 2016-09-21 12:27:16 +0800 | [diff] [blame] | 28 | #include "qemu/uuid.h" |
Jeff Cody | 3412f7b | 2013-10-30 10:44:53 -0400 | [diff] [blame] | 29 | |
| 30 | /* Options for VHDX creation */ |
| 31 | |
| 32 | #define VHDX_BLOCK_OPT_LOG_SIZE "log_size" |
| 33 | #define VHDX_BLOCK_OPT_BLOCK_SIZE "block_size" |
| 34 | #define VHDX_BLOCK_OPT_ZERO "block_state_zero" |
| 35 | |
| 36 | typedef enum VHDXImageType { |
| 37 | VHDX_TYPE_DYNAMIC = 0, |
| 38 | VHDX_TYPE_FIXED, |
| 39 | VHDX_TYPE_DIFFERENCING, /* Currently unsupported */ |
| 40 | } VHDXImageType; |
Jeff Cody | e8d4e5f | 2013-04-29 14:48:18 -0400 | [diff] [blame] | 41 | |
| 42 | /* Several metadata and region table data entries are identified by |
| 43 | * guids in a MS-specific GUID format. */ |
| 44 | |
| 45 | |
| 46 | /* ------- Known Region Table GUIDs ---------------------- */ |
| 47 | static const MSGUID bat_guid = { .data1 = 0x2dc27766, |
| 48 | .data2 = 0xf623, |
| 49 | .data3 = 0x4200, |
| 50 | .data4 = { 0x9d, 0x64, 0x11, 0x5e, |
| 51 | 0x9b, 0xfd, 0x4a, 0x08} }; |
| 52 | |
| 53 | static const MSGUID metadata_guid = { .data1 = 0x8b7ca206, |
| 54 | .data2 = 0x4790, |
| 55 | .data3 = 0x4b9a, |
| 56 | .data4 = { 0xb8, 0xfe, 0x57, 0x5f, |
| 57 | 0x05, 0x0f, 0x88, 0x6e} }; |
| 58 | |
| 59 | |
| 60 | |
| 61 | /* ------- Known Metadata Entry GUIDs ---------------------- */ |
| 62 | static const MSGUID file_param_guid = { .data1 = 0xcaa16737, |
| 63 | .data2 = 0xfa36, |
| 64 | .data3 = 0x4d43, |
| 65 | .data4 = { 0xb3, 0xb6, 0x33, 0xf0, |
| 66 | 0xaa, 0x44, 0xe7, 0x6b} }; |
| 67 | |
| 68 | static const MSGUID virtual_size_guid = { .data1 = 0x2FA54224, |
| 69 | .data2 = 0xcd1b, |
| 70 | .data3 = 0x4876, |
| 71 | .data4 = { 0xb2, 0x11, 0x5d, 0xbe, |
| 72 | 0xd8, 0x3b, 0xf4, 0xb8} }; |
| 73 | |
| 74 | static const MSGUID page83_guid = { .data1 = 0xbeca12ab, |
| 75 | .data2 = 0xb2e6, |
| 76 | .data3 = 0x4523, |
| 77 | .data4 = { 0x93, 0xef, 0xc3, 0x09, |
| 78 | 0xe0, 0x00, 0xc7, 0x46} }; |
| 79 | |
| 80 | |
| 81 | static const MSGUID phys_sector_guid = { .data1 = 0xcda348c7, |
| 82 | .data2 = 0x445d, |
| 83 | .data3 = 0x4471, |
| 84 | .data4 = { 0x9c, 0xc9, 0xe9, 0x88, |
| 85 | 0x52, 0x51, 0xc5, 0x56} }; |
| 86 | |
| 87 | static const MSGUID parent_locator_guid = { .data1 = 0xa8d35f2d, |
| 88 | .data2 = 0xb30b, |
| 89 | .data3 = 0x454d, |
| 90 | .data4 = { 0xab, 0xf7, 0xd3, |
| 91 | 0xd8, 0x48, 0x34, |
| 92 | 0xab, 0x0c} }; |
| 93 | |
| 94 | static const MSGUID logical_sector_guid = { .data1 = 0x8141bf1d, |
| 95 | .data2 = 0xa96f, |
| 96 | .data3 = 0x4709, |
| 97 | .data4 = { 0xba, 0x47, 0xf2, |
| 98 | 0x33, 0xa8, 0xfa, |
| 99 | 0xab, 0x5f} }; |
| 100 | |
| 101 | /* Each parent type must have a valid GUID; this is for parent images |
| 102 | * of type 'VHDX'. If we were to allow e.g. a QCOW2 parent, we would |
| 103 | * need to make up our own QCOW2 GUID type */ |
Peter Maydell | c2ebb05 | 2014-09-14 20:29:59 +0100 | [diff] [blame] | 104 | static const MSGUID parent_vhdx_guid __attribute__((unused)) |
| 105 | = { .data1 = 0xb04aefb7, |
Jeff Cody | e8d4e5f | 2013-04-29 14:48:18 -0400 | [diff] [blame] | 106 | .data2 = 0xd19e, |
| 107 | .data3 = 0x4a81, |
| 108 | .data4 = { 0xb7, 0x89, 0x25, 0xb8, |
| 109 | 0xe9, 0x44, 0x59, 0x13} }; |
| 110 | |
| 111 | |
| 112 | #define META_FILE_PARAMETER_PRESENT 0x01 |
| 113 | #define META_VIRTUAL_DISK_SIZE_PRESENT 0x02 |
| 114 | #define META_PAGE_83_PRESENT 0x04 |
| 115 | #define META_LOGICAL_SECTOR_SIZE_PRESENT 0x08 |
| 116 | #define META_PHYS_SECTOR_SIZE_PRESENT 0x10 |
| 117 | #define META_PARENT_LOCATOR_PRESENT 0x20 |
| 118 | |
| 119 | #define META_ALL_PRESENT \ |
| 120 | (META_FILE_PARAMETER_PRESENT | META_VIRTUAL_DISK_SIZE_PRESENT | \ |
| 121 | META_PAGE_83_PRESENT | META_LOGICAL_SECTOR_SIZE_PRESENT | \ |
| 122 | META_PHYS_SECTOR_SIZE_PRESENT) |
| 123 | |
Jeff Cody | e8d4e5f | 2013-04-29 14:48:18 -0400 | [diff] [blame] | 124 | |
Jeff Cody | 059e2fb | 2013-04-29 14:48:19 -0400 | [diff] [blame] | 125 | typedef struct VHDXSectorInfo { |
| 126 | uint32_t bat_idx; /* BAT entry index */ |
| 127 | uint32_t sectors_avail; /* sectors available in payload block */ |
| 128 | uint32_t bytes_left; /* bytes left in the block after data to r/w */ |
| 129 | uint32_t bytes_avail; /* bytes available in payload block */ |
| 130 | uint64_t file_offset; /* absolute offset in bytes, in file */ |
| 131 | uint64_t block_offset; /* block offset, in bytes */ |
| 132 | } VHDXSectorInfo; |
| 133 | |
Jeff Cody | 4f18b78 | 2013-10-30 10:44:39 -0400 | [diff] [blame] | 134 | /* Calculates new checksum. |
| 135 | * |
| 136 | * Zero is substituted during crc calculation for the original crc field |
| 137 | * crc_offset: byte offset in buf of the buffer crc |
| 138 | * buf: buffer pointer |
| 139 | * size: size of buffer (must be > crc_offset+4) |
| 140 | * |
Jeff Cody | 4f75b52 | 2014-08-06 15:54:58 -0400 | [diff] [blame] | 141 | * Note: The buffer should have all multi-byte data in little-endian format, |
| 142 | * and the resulting checksum is in little endian format. |
Jeff Cody | 4f18b78 | 2013-10-30 10:44:39 -0400 | [diff] [blame] | 143 | */ |
| 144 | uint32_t vhdx_update_checksum(uint8_t *buf, size_t size, int crc_offset) |
| 145 | { |
| 146 | uint32_t crc; |
| 147 | |
| 148 | assert(buf != NULL); |
| 149 | assert(size > (crc_offset + sizeof(crc))); |
| 150 | |
| 151 | memset(buf + crc_offset, 0, sizeof(crc)); |
| 152 | crc = crc32c(0xffffffff, buf, size); |
Jeff Cody | 4f75b52 | 2014-08-06 15:54:58 -0400 | [diff] [blame] | 153 | cpu_to_le32s(&crc); |
Jeff Cody | 4f18b78 | 2013-10-30 10:44:39 -0400 | [diff] [blame] | 154 | memcpy(buf + crc_offset, &crc, sizeof(crc)); |
| 155 | |
| 156 | return crc; |
| 157 | } |
| 158 | |
Jeff Cody | e8d4e5f | 2013-04-29 14:48:18 -0400 | [diff] [blame] | 159 | uint32_t vhdx_checksum_calc(uint32_t crc, uint8_t *buf, size_t size, |
| 160 | int crc_offset) |
| 161 | { |
| 162 | uint32_t crc_new; |
| 163 | uint32_t crc_orig; |
| 164 | assert(buf != NULL); |
| 165 | |
| 166 | if (crc_offset > 0) { |
| 167 | memcpy(&crc_orig, buf + crc_offset, sizeof(crc_orig)); |
| 168 | memset(buf + crc_offset, 0, sizeof(crc_orig)); |
| 169 | } |
| 170 | |
| 171 | crc_new = crc32c(crc, buf, size); |
| 172 | if (crc_offset > 0) { |
| 173 | memcpy(buf + crc_offset, &crc_orig, sizeof(crc_orig)); |
| 174 | } |
| 175 | |
| 176 | return crc_new; |
| 177 | } |
| 178 | |
| 179 | /* Validates the checksum of the buffer, with an in-place CRC. |
| 180 | * |
| 181 | * Zero is substituted during crc calculation for the original crc field, |
| 182 | * and the crc field is restored afterwards. But the buffer will be modifed |
| 183 | * during the calculation, so this may not be not suitable for multi-threaded |
| 184 | * use. |
| 185 | * |
| 186 | * crc_offset: byte offset in buf of the buffer crc |
| 187 | * buf: buffer pointer |
| 188 | * size: size of buffer (must be > crc_offset+4) |
| 189 | * |
| 190 | * returns true if checksum is valid, false otherwise |
| 191 | */ |
| 192 | bool vhdx_checksum_is_valid(uint8_t *buf, size_t size, int crc_offset) |
| 193 | { |
| 194 | uint32_t crc_orig; |
| 195 | uint32_t crc; |
| 196 | |
| 197 | assert(buf != NULL); |
| 198 | assert(size > (crc_offset + 4)); |
| 199 | |
| 200 | memcpy(&crc_orig, buf + crc_offset, sizeof(crc_orig)); |
| 201 | crc_orig = le32_to_cpu(crc_orig); |
| 202 | |
| 203 | crc = vhdx_checksum_calc(0xffffffff, buf, size, crc_offset); |
| 204 | |
| 205 | return crc == crc_orig; |
| 206 | } |
| 207 | |
| 208 | |
| 209 | /* |
Jeff Cody | 4f18b78 | 2013-10-30 10:44:39 -0400 | [diff] [blame] | 210 | * This generates a UUID that is compliant with the MS GUIDs used |
| 211 | * in the VHDX spec (and elsewhere). |
| 212 | */ |
| 213 | void vhdx_guid_generate(MSGUID *guid) |
| 214 | { |
Fam Zheng | cb6414d | 2016-09-21 12:27:16 +0800 | [diff] [blame] | 215 | QemuUUID uuid; |
Jeff Cody | 4f18b78 | 2013-10-30 10:44:39 -0400 | [diff] [blame] | 216 | assert(guid != NULL); |
| 217 | |
Fam Zheng | cb6414d | 2016-09-21 12:27:16 +0800 | [diff] [blame] | 218 | qemu_uuid_generate(&uuid); |
| 219 | memcpy(guid, &uuid, sizeof(MSGUID)); |
Jeff Cody | 4f18b78 | 2013-10-30 10:44:39 -0400 | [diff] [blame] | 220 | } |
| 221 | |
Jeff Cody | 1a848fd | 2013-10-30 10:44:46 -0400 | [diff] [blame] | 222 | /* Check for region overlaps inside the VHDX image */ |
| 223 | static int vhdx_region_check(BDRVVHDXState *s, uint64_t start, uint64_t length) |
| 224 | { |
| 225 | int ret = 0; |
| 226 | uint64_t end; |
| 227 | VHDXRegionEntry *r; |
| 228 | |
| 229 | end = start + length; |
| 230 | QLIST_FOREACH(r, &s->regions, entries) { |
| 231 | if (!((start >= r->end) || (end <= r->start))) { |
| 232 | ret = -EINVAL; |
| 233 | goto exit; |
| 234 | } |
| 235 | } |
| 236 | |
| 237 | exit: |
| 238 | return ret; |
| 239 | } |
| 240 | |
| 241 | /* Register a region for future checks */ |
| 242 | static void vhdx_region_register(BDRVVHDXState *s, |
| 243 | uint64_t start, uint64_t length) |
| 244 | { |
| 245 | VHDXRegionEntry *r; |
| 246 | |
| 247 | r = g_malloc0(sizeof(*r)); |
| 248 | |
| 249 | r->start = start; |
| 250 | r->end = start + length; |
| 251 | |
| 252 | QLIST_INSERT_HEAD(&s->regions, r, entries); |
| 253 | } |
| 254 | |
| 255 | /* Free all registered regions */ |
| 256 | static void vhdx_region_unregister_all(BDRVVHDXState *s) |
| 257 | { |
| 258 | VHDXRegionEntry *r, *r_next; |
| 259 | |
| 260 | QLIST_FOREACH_SAFE(r, &s->regions, entries, r_next) { |
| 261 | QLIST_REMOVE(r, entries); |
| 262 | g_free(r); |
| 263 | } |
| 264 | } |
| 265 | |
Jeff Cody | 1e74a97 | 2013-10-30 10:44:51 -0400 | [diff] [blame] | 266 | static void vhdx_set_shift_bits(BDRVVHDXState *s) |
| 267 | { |
Max Reitz | 04a3615 | 2015-12-18 16:04:26 +0100 | [diff] [blame] | 268 | s->logical_sector_size_bits = ctz32(s->logical_sector_size); |
| 269 | s->sectors_per_block_bits = ctz32(s->sectors_per_block); |
| 270 | s->chunk_ratio_bits = ctz64(s->chunk_ratio); |
| 271 | s->block_size_bits = ctz32(s->block_size); |
Jeff Cody | 1e74a97 | 2013-10-30 10:44:51 -0400 | [diff] [blame] | 272 | } |
| 273 | |
Jeff Cody | 4f18b78 | 2013-10-30 10:44:39 -0400 | [diff] [blame] | 274 | /* |
Jeff Cody | e8d4e5f | 2013-04-29 14:48:18 -0400 | [diff] [blame] | 275 | * Per the MS VHDX Specification, for every VHDX file: |
| 276 | * - The header section is fixed size - 1 MB |
| 277 | * - The header section is always the first "object" |
| 278 | * - The first 64KB of the header is the File Identifier |
| 279 | * - The first uint64 (8 bytes) is the VHDX Signature ("vhdxfile") |
| 280 | * - The following 512 bytes constitute a UTF-16 string identifiying the |
| 281 | * software that created the file, and is optional and diagnostic only. |
| 282 | * |
| 283 | * Therefore, we probe by looking for the vhdxfile signature "vhdxfile" |
| 284 | */ |
| 285 | static int vhdx_probe(const uint8_t *buf, int buf_size, const char *filename) |
| 286 | { |
| 287 | if (buf_size >= 8 && !memcmp(buf, "vhdxfile", 8)) { |
| 288 | return 100; |
| 289 | } |
| 290 | return 0; |
| 291 | } |
| 292 | |
Jeff Cody | 1e74a97 | 2013-10-30 10:44:51 -0400 | [diff] [blame] | 293 | /* |
| 294 | * Writes the header to the specified offset. |
| 295 | * |
| 296 | * This will optionally read in buffer data from disk (otherwise zero-fill), |
| 297 | * and then update the header checksum. Header is converted to proper |
| 298 | * endianness before being written to the specified file offset |
| 299 | */ |
Kevin Wolf | cf2ab8f | 2016-06-20 18:24:02 +0200 | [diff] [blame] | 300 | static int vhdx_write_header(BdrvChild *file, VHDXHeader *hdr, |
Jeff Cody | 1e74a97 | 2013-10-30 10:44:51 -0400 | [diff] [blame] | 301 | uint64_t offset, bool read) |
| 302 | { |
Kevin Wolf | cf2ab8f | 2016-06-20 18:24:02 +0200 | [diff] [blame] | 303 | BlockDriverState *bs_file = file->bs; |
Jeff Cody | 1e74a97 | 2013-10-30 10:44:51 -0400 | [diff] [blame] | 304 | uint8_t *buffer = NULL; |
| 305 | int ret; |
Jeff Cody | 4f75b52 | 2014-08-06 15:54:58 -0400 | [diff] [blame] | 306 | VHDXHeader *header_le; |
Jeff Cody | 1e74a97 | 2013-10-30 10:44:51 -0400 | [diff] [blame] | 307 | |
| 308 | assert(bs_file != NULL); |
| 309 | assert(hdr != NULL); |
| 310 | |
| 311 | /* the header checksum is not over just the packed size of VHDXHeader, |
| 312 | * but rather over the entire 'reserved' range for the header, which is |
| 313 | * 4KB (VHDX_HEADER_SIZE). */ |
| 314 | |
| 315 | buffer = qemu_blockalign(bs_file, VHDX_HEADER_SIZE); |
| 316 | if (read) { |
| 317 | /* if true, we can't assume the extra reserved bytes are 0 */ |
Kevin Wolf | cf2ab8f | 2016-06-20 18:24:02 +0200 | [diff] [blame] | 318 | ret = bdrv_pread(file, offset, buffer, VHDX_HEADER_SIZE); |
Jeff Cody | 1e74a97 | 2013-10-30 10:44:51 -0400 | [diff] [blame] | 319 | if (ret < 0) { |
| 320 | goto exit; |
| 321 | } |
| 322 | } else { |
| 323 | memset(buffer, 0, VHDX_HEADER_SIZE); |
| 324 | } |
| 325 | |
| 326 | /* overwrite the actual VHDXHeader portion */ |
Jeff Cody | 4f75b52 | 2014-08-06 15:54:58 -0400 | [diff] [blame] | 327 | header_le = (VHDXHeader *)buffer; |
| 328 | memcpy(header_le, hdr, sizeof(VHDXHeader)); |
| 329 | vhdx_header_le_export(hdr, header_le); |
| 330 | vhdx_update_checksum(buffer, VHDX_HEADER_SIZE, |
| 331 | offsetof(VHDXHeader, checksum)); |
Kevin Wolf | d9ca2ea | 2016-06-20 20:09:15 +0200 | [diff] [blame] | 332 | ret = bdrv_pwrite_sync(file, offset, header_le, sizeof(VHDXHeader)); |
Jeff Cody | 1e74a97 | 2013-10-30 10:44:51 -0400 | [diff] [blame] | 333 | |
| 334 | exit: |
| 335 | qemu_vfree(buffer); |
| 336 | return ret; |
| 337 | } |
| 338 | |
Jeff Cody | 4f18b78 | 2013-10-30 10:44:39 -0400 | [diff] [blame] | 339 | /* Update the VHDX headers |
| 340 | * |
| 341 | * This follows the VHDX spec procedures for header updates. |
| 342 | * |
| 343 | * - non-current header is updated with largest sequence number |
| 344 | */ |
| 345 | static int vhdx_update_header(BlockDriverState *bs, BDRVVHDXState *s, |
Jeff Cody | c3906c5 | 2013-10-30 10:44:43 -0400 | [diff] [blame] | 346 | bool generate_data_write_guid, MSGUID *log_guid) |
Jeff Cody | 4f18b78 | 2013-10-30 10:44:39 -0400 | [diff] [blame] | 347 | { |
| 348 | int ret = 0; |
| 349 | int hdr_idx = 0; |
| 350 | uint64_t header_offset = VHDX_HEADER1_OFFSET; |
| 351 | |
| 352 | VHDXHeader *active_header; |
| 353 | VHDXHeader *inactive_header; |
Jeff Cody | 4f18b78 | 2013-10-30 10:44:39 -0400 | [diff] [blame] | 354 | |
| 355 | /* operate on the non-current header */ |
| 356 | if (s->curr_header == 0) { |
| 357 | hdr_idx = 1; |
| 358 | header_offset = VHDX_HEADER2_OFFSET; |
| 359 | } |
| 360 | |
| 361 | active_header = s->headers[s->curr_header]; |
| 362 | inactive_header = s->headers[hdr_idx]; |
| 363 | |
| 364 | inactive_header->sequence_number = active_header->sequence_number + 1; |
| 365 | |
| 366 | /* a new file guid must be generated before any file write, including |
| 367 | * headers */ |
| 368 | inactive_header->file_write_guid = s->session_guid; |
| 369 | |
| 370 | /* a new data guid only needs to be generated before any guest-visible |
| 371 | * writes (i.e. something observable via virtual disk read) */ |
| 372 | if (generate_data_write_guid) { |
| 373 | vhdx_guid_generate(&inactive_header->data_write_guid); |
| 374 | } |
| 375 | |
Jeff Cody | c3906c5 | 2013-10-30 10:44:43 -0400 | [diff] [blame] | 376 | /* update the log guid if present */ |
| 377 | if (log_guid) { |
| 378 | inactive_header->log_guid = *log_guid; |
| 379 | } |
| 380 | |
Kevin Wolf | cf2ab8f | 2016-06-20 18:24:02 +0200 | [diff] [blame] | 381 | ret = vhdx_write_header(bs->file, inactive_header, header_offset, true); |
Jeff Cody | 4f18b78 | 2013-10-30 10:44:39 -0400 | [diff] [blame] | 382 | if (ret < 0) { |
| 383 | goto exit; |
| 384 | } |
| 385 | s->curr_header = hdr_idx; |
| 386 | |
| 387 | exit: |
Jeff Cody | 4f18b78 | 2013-10-30 10:44:39 -0400 | [diff] [blame] | 388 | return ret; |
| 389 | } |
| 390 | |
| 391 | /* |
| 392 | * The VHDX spec calls for header updates to be performed twice, so that both |
| 393 | * the current and non-current header have valid info |
| 394 | */ |
Jeff Cody | c3906c5 | 2013-10-30 10:44:43 -0400 | [diff] [blame] | 395 | int vhdx_update_headers(BlockDriverState *bs, BDRVVHDXState *s, |
| 396 | bool generate_data_write_guid, MSGUID *log_guid) |
Jeff Cody | 4f18b78 | 2013-10-30 10:44:39 -0400 | [diff] [blame] | 397 | { |
| 398 | int ret; |
| 399 | |
Jeff Cody | c3906c5 | 2013-10-30 10:44:43 -0400 | [diff] [blame] | 400 | ret = vhdx_update_header(bs, s, generate_data_write_guid, log_guid); |
Jeff Cody | 4f18b78 | 2013-10-30 10:44:39 -0400 | [diff] [blame] | 401 | if (ret < 0) { |
| 402 | return ret; |
| 403 | } |
Jeff Cody | c3906c5 | 2013-10-30 10:44:43 -0400 | [diff] [blame] | 404 | ret = vhdx_update_header(bs, s, generate_data_write_guid, log_guid); |
Jeff Cody | 4f18b78 | 2013-10-30 10:44:39 -0400 | [diff] [blame] | 405 | return ret; |
| 406 | } |
Jeff Cody | e8d4e5f | 2013-04-29 14:48:18 -0400 | [diff] [blame] | 407 | |
| 408 | /* opens the specified header block from the VHDX file header section */ |
Paolo Bonzini | 6890aad | 2014-02-17 14:44:00 +0100 | [diff] [blame] | 409 | static void vhdx_parse_header(BlockDriverState *bs, BDRVVHDXState *s, |
| 410 | Error **errp) |
Jeff Cody | e8d4e5f | 2013-04-29 14:48:18 -0400 | [diff] [blame] | 411 | { |
Paolo Bonzini | 6890aad | 2014-02-17 14:44:00 +0100 | [diff] [blame] | 412 | int ret; |
Jeff Cody | e8d4e5f | 2013-04-29 14:48:18 -0400 | [diff] [blame] | 413 | VHDXHeader *header1; |
| 414 | VHDXHeader *header2; |
| 415 | bool h1_valid = false; |
| 416 | bool h2_valid = false; |
| 417 | uint64_t h1_seq = 0; |
| 418 | uint64_t h2_seq = 0; |
| 419 | uint8_t *buffer; |
| 420 | |
Jeff Cody | 6e9d290 | 2013-10-30 10:44:38 -0400 | [diff] [blame] | 421 | /* header1 & header2 are freed in vhdx_close() */ |
Jeff Cody | e8d4e5f | 2013-04-29 14:48:18 -0400 | [diff] [blame] | 422 | header1 = qemu_blockalign(bs, sizeof(VHDXHeader)); |
| 423 | header2 = qemu_blockalign(bs, sizeof(VHDXHeader)); |
| 424 | |
| 425 | buffer = qemu_blockalign(bs, VHDX_HEADER_SIZE); |
| 426 | |
| 427 | s->headers[0] = header1; |
| 428 | s->headers[1] = header2; |
| 429 | |
| 430 | /* We have to read the whole VHDX_HEADER_SIZE instead of |
| 431 | * sizeof(VHDXHeader), because the checksum is over the whole |
| 432 | * region */ |
Kevin Wolf | cf2ab8f | 2016-06-20 18:24:02 +0200 | [diff] [blame] | 433 | ret = bdrv_pread(bs->file, VHDX_HEADER1_OFFSET, buffer, |
Kevin Wolf | 9a4f4c3 | 2015-06-16 14:19:22 +0200 | [diff] [blame] | 434 | VHDX_HEADER_SIZE); |
Jeff Cody | e8d4e5f | 2013-04-29 14:48:18 -0400 | [diff] [blame] | 435 | if (ret < 0) { |
| 436 | goto fail; |
| 437 | } |
| 438 | /* copy over just the relevant portion that we need */ |
| 439 | memcpy(header1, buffer, sizeof(VHDXHeader)); |
Jeff Cody | e8d4e5f | 2013-04-29 14:48:18 -0400 | [diff] [blame] | 440 | |
Jeff Cody | 4f75b52 | 2014-08-06 15:54:58 -0400 | [diff] [blame] | 441 | if (vhdx_checksum_is_valid(buffer, VHDX_HEADER_SIZE, 4)) { |
| 442 | vhdx_header_le_import(header1); |
| 443 | if (header1->signature == VHDX_HEADER_SIGNATURE && |
| 444 | header1->version == 1) { |
| 445 | h1_seq = header1->sequence_number; |
| 446 | h1_valid = true; |
| 447 | } |
Jeff Cody | e8d4e5f | 2013-04-29 14:48:18 -0400 | [diff] [blame] | 448 | } |
| 449 | |
Kevin Wolf | cf2ab8f | 2016-06-20 18:24:02 +0200 | [diff] [blame] | 450 | ret = bdrv_pread(bs->file, VHDX_HEADER2_OFFSET, buffer, |
Kevin Wolf | 9a4f4c3 | 2015-06-16 14:19:22 +0200 | [diff] [blame] | 451 | VHDX_HEADER_SIZE); |
Jeff Cody | e8d4e5f | 2013-04-29 14:48:18 -0400 | [diff] [blame] | 452 | if (ret < 0) { |
| 453 | goto fail; |
| 454 | } |
| 455 | /* copy over just the relevant portion that we need */ |
| 456 | memcpy(header2, buffer, sizeof(VHDXHeader)); |
Jeff Cody | e8d4e5f | 2013-04-29 14:48:18 -0400 | [diff] [blame] | 457 | |
Jeff Cody | 4f75b52 | 2014-08-06 15:54:58 -0400 | [diff] [blame] | 458 | if (vhdx_checksum_is_valid(buffer, VHDX_HEADER_SIZE, 4)) { |
| 459 | vhdx_header_le_import(header2); |
| 460 | if (header2->signature == VHDX_HEADER_SIGNATURE && |
| 461 | header2->version == 1) { |
| 462 | h2_seq = header2->sequence_number; |
| 463 | h2_valid = true; |
| 464 | } |
Jeff Cody | e8d4e5f | 2013-04-29 14:48:18 -0400 | [diff] [blame] | 465 | } |
| 466 | |
| 467 | /* If there is only 1 valid header (or no valid headers), we |
| 468 | * don't care what the sequence numbers are */ |
| 469 | if (h1_valid && !h2_valid) { |
| 470 | s->curr_header = 0; |
| 471 | } else if (!h1_valid && h2_valid) { |
| 472 | s->curr_header = 1; |
| 473 | } else if (!h1_valid && !h2_valid) { |
Jeff Cody | e8d4e5f | 2013-04-29 14:48:18 -0400 | [diff] [blame] | 474 | goto fail; |
| 475 | } else { |
| 476 | /* If both headers are valid, then we choose the active one by the |
| 477 | * highest sequence number. If the sequence numbers are equal, that is |
| 478 | * invalid */ |
| 479 | if (h1_seq > h2_seq) { |
| 480 | s->curr_header = 0; |
| 481 | } else if (h2_seq > h1_seq) { |
| 482 | s->curr_header = 1; |
| 483 | } else { |
Jeff Cody | 6906046 | 2014-05-13 10:00:52 -0400 | [diff] [blame] | 484 | /* The Microsoft Disk2VHD tool will create 2 identical |
| 485 | * headers, with identical sequence numbers. If the headers are |
| 486 | * identical, don't consider the file corrupt */ |
| 487 | if (!memcmp(header1, header2, sizeof(VHDXHeader))) { |
| 488 | s->curr_header = 0; |
| 489 | } else { |
| 490 | goto fail; |
| 491 | } |
Jeff Cody | e8d4e5f | 2013-04-29 14:48:18 -0400 | [diff] [blame] | 492 | } |
| 493 | } |
| 494 | |
Jeff Cody | 1a848fd | 2013-10-30 10:44:46 -0400 | [diff] [blame] | 495 | vhdx_region_register(s, s->headers[s->curr_header]->log_offset, |
| 496 | s->headers[s->curr_header]->log_length); |
Jeff Cody | e8d4e5f | 2013-04-29 14:48:18 -0400 | [diff] [blame] | 497 | goto exit; |
| 498 | |
| 499 | fail: |
Paolo Bonzini | 6890aad | 2014-02-17 14:44:00 +0100 | [diff] [blame] | 500 | error_setg_errno(errp, -ret, "No valid VHDX header found"); |
Jeff Cody | e8d4e5f | 2013-04-29 14:48:18 -0400 | [diff] [blame] | 501 | qemu_vfree(header1); |
| 502 | qemu_vfree(header2); |
| 503 | s->headers[0] = NULL; |
| 504 | s->headers[1] = NULL; |
| 505 | exit: |
| 506 | qemu_vfree(buffer); |
Jeff Cody | e8d4e5f | 2013-04-29 14:48:18 -0400 | [diff] [blame] | 507 | } |
| 508 | |
| 509 | |
| 510 | static int vhdx_open_region_tables(BlockDriverState *bs, BDRVVHDXState *s) |
| 511 | { |
| 512 | int ret = 0; |
| 513 | uint8_t *buffer; |
| 514 | int offset = 0; |
| 515 | VHDXRegionTableEntry rt_entry; |
| 516 | uint32_t i; |
| 517 | bool bat_rt_found = false; |
| 518 | bool metadata_rt_found = false; |
| 519 | |
| 520 | /* We have to read the whole 64KB block, because the crc32 is over the |
| 521 | * whole block */ |
| 522 | buffer = qemu_blockalign(bs, VHDX_HEADER_BLOCK_SIZE); |
| 523 | |
Kevin Wolf | cf2ab8f | 2016-06-20 18:24:02 +0200 | [diff] [blame] | 524 | ret = bdrv_pread(bs->file, VHDX_REGION_TABLE_OFFSET, buffer, |
Jeff Cody | e8d4e5f | 2013-04-29 14:48:18 -0400 | [diff] [blame] | 525 | VHDX_HEADER_BLOCK_SIZE); |
| 526 | if (ret < 0) { |
| 527 | goto fail; |
| 528 | } |
| 529 | memcpy(&s->rt, buffer, sizeof(s->rt)); |
Jeff Cody | e8d4e5f | 2013-04-29 14:48:18 -0400 | [diff] [blame] | 530 | offset += sizeof(s->rt); |
| 531 | |
Jeff Cody | 4f75b52 | 2014-08-06 15:54:58 -0400 | [diff] [blame] | 532 | if (!vhdx_checksum_is_valid(buffer, VHDX_HEADER_BLOCK_SIZE, 4)) { |
Jeff Cody | e8d4e5f | 2013-04-29 14:48:18 -0400 | [diff] [blame] | 533 | ret = -EINVAL; |
| 534 | goto fail; |
| 535 | } |
| 536 | |
Jeff Cody | 4f75b52 | 2014-08-06 15:54:58 -0400 | [diff] [blame] | 537 | vhdx_region_header_le_import(&s->rt); |
| 538 | |
| 539 | if (s->rt.signature != VHDX_REGION_SIGNATURE) { |
| 540 | ret = -EINVAL; |
| 541 | goto fail; |
| 542 | } |
| 543 | |
| 544 | |
Jeff Cody | e8d4e5f | 2013-04-29 14:48:18 -0400 | [diff] [blame] | 545 | /* Per spec, maximum region table entry count is 2047 */ |
| 546 | if (s->rt.entry_count > 2047) { |
| 547 | ret = -EINVAL; |
| 548 | goto fail; |
| 549 | } |
| 550 | |
| 551 | for (i = 0; i < s->rt.entry_count; i++) { |
| 552 | memcpy(&rt_entry, buffer + offset, sizeof(rt_entry)); |
| 553 | offset += sizeof(rt_entry); |
| 554 | |
Jeff Cody | c325ee1 | 2013-10-30 10:44:50 -0400 | [diff] [blame] | 555 | vhdx_region_entry_le_import(&rt_entry); |
Jeff Cody | e8d4e5f | 2013-04-29 14:48:18 -0400 | [diff] [blame] | 556 | |
Jeff Cody | 1a848fd | 2013-10-30 10:44:46 -0400 | [diff] [blame] | 557 | /* check for region overlap between these entries, and any |
| 558 | * other memory regions in the file */ |
| 559 | ret = vhdx_region_check(s, rt_entry.file_offset, rt_entry.length); |
| 560 | if (ret < 0) { |
| 561 | goto fail; |
| 562 | } |
| 563 | |
| 564 | vhdx_region_register(s, rt_entry.file_offset, rt_entry.length); |
| 565 | |
Jeff Cody | e8d4e5f | 2013-04-29 14:48:18 -0400 | [diff] [blame] | 566 | /* see if we recognize the entry */ |
| 567 | if (guid_eq(rt_entry.guid, bat_guid)) { |
| 568 | /* must be unique; if we have already found it this is invalid */ |
| 569 | if (bat_rt_found) { |
| 570 | ret = -EINVAL; |
| 571 | goto fail; |
| 572 | } |
| 573 | bat_rt_found = true; |
| 574 | s->bat_rt = rt_entry; |
| 575 | continue; |
| 576 | } |
| 577 | |
| 578 | if (guid_eq(rt_entry.guid, metadata_guid)) { |
| 579 | /* must be unique; if we have already found it this is invalid */ |
| 580 | if (metadata_rt_found) { |
| 581 | ret = -EINVAL; |
| 582 | goto fail; |
| 583 | } |
| 584 | metadata_rt_found = true; |
| 585 | s->metadata_rt = rt_entry; |
| 586 | continue; |
| 587 | } |
| 588 | |
| 589 | if (rt_entry.data_bits & VHDX_REGION_ENTRY_REQUIRED) { |
| 590 | /* cannot read vhdx file - required region table entry that |
| 591 | * we do not understand. per spec, we must fail to open */ |
| 592 | ret = -ENOTSUP; |
| 593 | goto fail; |
| 594 | } |
| 595 | } |
Jeff Cody | 1a848fd | 2013-10-30 10:44:46 -0400 | [diff] [blame] | 596 | |
| 597 | if (!bat_rt_found || !metadata_rt_found) { |
| 598 | ret = -EINVAL; |
| 599 | goto fail; |
| 600 | } |
| 601 | |
Jeff Cody | e8d4e5f | 2013-04-29 14:48:18 -0400 | [diff] [blame] | 602 | ret = 0; |
| 603 | |
| 604 | fail: |
| 605 | qemu_vfree(buffer); |
| 606 | return ret; |
| 607 | } |
| 608 | |
| 609 | |
| 610 | |
| 611 | /* Metadata initial parser |
| 612 | * |
| 613 | * This loads all the metadata entry fields. This may cause additional |
| 614 | * fields to be processed (e.g. parent locator, etc..). |
| 615 | * |
| 616 | * There are 5 Metadata items that are always required: |
| 617 | * - File Parameters (block size, has a parent) |
| 618 | * - Virtual Disk Size (size, in bytes, of the virtual drive) |
| 619 | * - Page 83 Data (scsi page 83 guid) |
| 620 | * - Logical Sector Size (logical sector size in bytes, either 512 or |
| 621 | * 4096. We only support 512 currently) |
| 622 | * - Physical Sector Size (512 or 4096) |
| 623 | * |
| 624 | * Also, if the File Parameters indicate this is a differencing file, |
| 625 | * we must also look for the Parent Locator metadata item. |
| 626 | */ |
| 627 | static int vhdx_parse_metadata(BlockDriverState *bs, BDRVVHDXState *s) |
| 628 | { |
| 629 | int ret = 0; |
| 630 | uint8_t *buffer; |
| 631 | int offset = 0; |
| 632 | uint32_t i = 0; |
| 633 | VHDXMetadataTableEntry md_entry; |
| 634 | |
| 635 | buffer = qemu_blockalign(bs, VHDX_METADATA_TABLE_MAX_SIZE); |
| 636 | |
Kevin Wolf | cf2ab8f | 2016-06-20 18:24:02 +0200 | [diff] [blame] | 637 | ret = bdrv_pread(bs->file, s->metadata_rt.file_offset, buffer, |
Jeff Cody | e8d4e5f | 2013-04-29 14:48:18 -0400 | [diff] [blame] | 638 | VHDX_METADATA_TABLE_MAX_SIZE); |
| 639 | if (ret < 0) { |
| 640 | goto exit; |
| 641 | } |
| 642 | memcpy(&s->metadata_hdr, buffer, sizeof(s->metadata_hdr)); |
| 643 | offset += sizeof(s->metadata_hdr); |
| 644 | |
Jeff Cody | c325ee1 | 2013-10-30 10:44:50 -0400 | [diff] [blame] | 645 | vhdx_metadata_header_le_import(&s->metadata_hdr); |
Jeff Cody | e8d4e5f | 2013-04-29 14:48:18 -0400 | [diff] [blame] | 646 | |
Jeff Cody | 4f75b52 | 2014-08-06 15:54:58 -0400 | [diff] [blame] | 647 | if (s->metadata_hdr.signature != VHDX_METADATA_SIGNATURE) { |
Jeff Cody | e8d4e5f | 2013-04-29 14:48:18 -0400 | [diff] [blame] | 648 | ret = -EINVAL; |
| 649 | goto exit; |
| 650 | } |
| 651 | |
| 652 | s->metadata_entries.present = 0; |
| 653 | |
| 654 | if ((s->metadata_hdr.entry_count * sizeof(md_entry)) > |
| 655 | (VHDX_METADATA_TABLE_MAX_SIZE - offset)) { |
| 656 | ret = -EINVAL; |
| 657 | goto exit; |
| 658 | } |
| 659 | |
| 660 | for (i = 0; i < s->metadata_hdr.entry_count; i++) { |
| 661 | memcpy(&md_entry, buffer + offset, sizeof(md_entry)); |
| 662 | offset += sizeof(md_entry); |
| 663 | |
Jeff Cody | c325ee1 | 2013-10-30 10:44:50 -0400 | [diff] [blame] | 664 | vhdx_metadata_entry_le_import(&md_entry); |
Jeff Cody | e8d4e5f | 2013-04-29 14:48:18 -0400 | [diff] [blame] | 665 | |
| 666 | if (guid_eq(md_entry.item_id, file_param_guid)) { |
| 667 | if (s->metadata_entries.present & META_FILE_PARAMETER_PRESENT) { |
| 668 | ret = -EINVAL; |
| 669 | goto exit; |
| 670 | } |
| 671 | s->metadata_entries.file_parameters_entry = md_entry; |
| 672 | s->metadata_entries.present |= META_FILE_PARAMETER_PRESENT; |
| 673 | continue; |
| 674 | } |
| 675 | |
| 676 | if (guid_eq(md_entry.item_id, virtual_size_guid)) { |
| 677 | if (s->metadata_entries.present & META_VIRTUAL_DISK_SIZE_PRESENT) { |
| 678 | ret = -EINVAL; |
| 679 | goto exit; |
| 680 | } |
| 681 | s->metadata_entries.virtual_disk_size_entry = md_entry; |
| 682 | s->metadata_entries.present |= META_VIRTUAL_DISK_SIZE_PRESENT; |
| 683 | continue; |
| 684 | } |
| 685 | |
| 686 | if (guid_eq(md_entry.item_id, page83_guid)) { |
| 687 | if (s->metadata_entries.present & META_PAGE_83_PRESENT) { |
| 688 | ret = -EINVAL; |
| 689 | goto exit; |
| 690 | } |
| 691 | s->metadata_entries.page83_data_entry = md_entry; |
| 692 | s->metadata_entries.present |= META_PAGE_83_PRESENT; |
| 693 | continue; |
| 694 | } |
| 695 | |
| 696 | if (guid_eq(md_entry.item_id, logical_sector_guid)) { |
| 697 | if (s->metadata_entries.present & |
| 698 | META_LOGICAL_SECTOR_SIZE_PRESENT) { |
| 699 | ret = -EINVAL; |
| 700 | goto exit; |
| 701 | } |
| 702 | s->metadata_entries.logical_sector_size_entry = md_entry; |
| 703 | s->metadata_entries.present |= META_LOGICAL_SECTOR_SIZE_PRESENT; |
| 704 | continue; |
| 705 | } |
| 706 | |
| 707 | if (guid_eq(md_entry.item_id, phys_sector_guid)) { |
| 708 | if (s->metadata_entries.present & META_PHYS_SECTOR_SIZE_PRESENT) { |
| 709 | ret = -EINVAL; |
| 710 | goto exit; |
| 711 | } |
| 712 | s->metadata_entries.phys_sector_size_entry = md_entry; |
| 713 | s->metadata_entries.present |= META_PHYS_SECTOR_SIZE_PRESENT; |
| 714 | continue; |
| 715 | } |
| 716 | |
| 717 | if (guid_eq(md_entry.item_id, parent_locator_guid)) { |
| 718 | if (s->metadata_entries.present & META_PARENT_LOCATOR_PRESENT) { |
| 719 | ret = -EINVAL; |
| 720 | goto exit; |
| 721 | } |
| 722 | s->metadata_entries.parent_locator_entry = md_entry; |
| 723 | s->metadata_entries.present |= META_PARENT_LOCATOR_PRESENT; |
| 724 | continue; |
| 725 | } |
| 726 | |
| 727 | if (md_entry.data_bits & VHDX_META_FLAGS_IS_REQUIRED) { |
| 728 | /* cannot read vhdx file - required region table entry that |
| 729 | * we do not understand. per spec, we must fail to open */ |
| 730 | ret = -ENOTSUP; |
| 731 | goto exit; |
| 732 | } |
| 733 | } |
| 734 | |
| 735 | if (s->metadata_entries.present != META_ALL_PRESENT) { |
| 736 | ret = -ENOTSUP; |
| 737 | goto exit; |
| 738 | } |
| 739 | |
Kevin Wolf | cf2ab8f | 2016-06-20 18:24:02 +0200 | [diff] [blame] | 740 | ret = bdrv_pread(bs->file, |
Jeff Cody | e8d4e5f | 2013-04-29 14:48:18 -0400 | [diff] [blame] | 741 | s->metadata_entries.file_parameters_entry.offset |
| 742 | + s->metadata_rt.file_offset, |
| 743 | &s->params, |
| 744 | sizeof(s->params)); |
| 745 | |
| 746 | if (ret < 0) { |
| 747 | goto exit; |
| 748 | } |
| 749 | |
| 750 | le32_to_cpus(&s->params.block_size); |
| 751 | le32_to_cpus(&s->params.data_bits); |
| 752 | |
| 753 | |
| 754 | /* We now have the file parameters, so we can tell if this is a |
| 755 | * differencing file (i.e.. has_parent), is dynamic or fixed |
| 756 | * sized (leave_blocks_allocated), and the block size */ |
| 757 | |
| 758 | /* The parent locator required iff the file parameters has_parent set */ |
| 759 | if (s->params.data_bits & VHDX_PARAMS_HAS_PARENT) { |
| 760 | if (s->metadata_entries.present & META_PARENT_LOCATOR_PRESENT) { |
| 761 | /* TODO: parse parent locator fields */ |
| 762 | ret = -ENOTSUP; /* temp, until differencing files are supported */ |
| 763 | goto exit; |
| 764 | } else { |
| 765 | /* if has_parent is set, but there is not parent locator present, |
| 766 | * then that is an invalid combination */ |
| 767 | ret = -EINVAL; |
| 768 | goto exit; |
| 769 | } |
| 770 | } |
| 771 | |
| 772 | /* determine virtual disk size, logical sector size, |
| 773 | * and phys sector size */ |
| 774 | |
Kevin Wolf | cf2ab8f | 2016-06-20 18:24:02 +0200 | [diff] [blame] | 775 | ret = bdrv_pread(bs->file, |
Jeff Cody | e8d4e5f | 2013-04-29 14:48:18 -0400 | [diff] [blame] | 776 | s->metadata_entries.virtual_disk_size_entry.offset |
| 777 | + s->metadata_rt.file_offset, |
| 778 | &s->virtual_disk_size, |
| 779 | sizeof(uint64_t)); |
| 780 | if (ret < 0) { |
| 781 | goto exit; |
| 782 | } |
Kevin Wolf | cf2ab8f | 2016-06-20 18:24:02 +0200 | [diff] [blame] | 783 | ret = bdrv_pread(bs->file, |
Jeff Cody | e8d4e5f | 2013-04-29 14:48:18 -0400 | [diff] [blame] | 784 | s->metadata_entries.logical_sector_size_entry.offset |
| 785 | + s->metadata_rt.file_offset, |
| 786 | &s->logical_sector_size, |
| 787 | sizeof(uint32_t)); |
| 788 | if (ret < 0) { |
| 789 | goto exit; |
| 790 | } |
Kevin Wolf | cf2ab8f | 2016-06-20 18:24:02 +0200 | [diff] [blame] | 791 | ret = bdrv_pread(bs->file, |
Jeff Cody | e8d4e5f | 2013-04-29 14:48:18 -0400 | [diff] [blame] | 792 | s->metadata_entries.phys_sector_size_entry.offset |
| 793 | + s->metadata_rt.file_offset, |
| 794 | &s->physical_sector_size, |
| 795 | sizeof(uint32_t)); |
| 796 | if (ret < 0) { |
| 797 | goto exit; |
| 798 | } |
| 799 | |
| 800 | le64_to_cpus(&s->virtual_disk_size); |
| 801 | le32_to_cpus(&s->logical_sector_size); |
| 802 | le32_to_cpus(&s->physical_sector_size); |
| 803 | |
Jeff Cody | 1d7678d | 2014-03-26 13:05:39 +0100 | [diff] [blame] | 804 | if (s->params.block_size < VHDX_BLOCK_SIZE_MIN || |
| 805 | s->params.block_size > VHDX_BLOCK_SIZE_MAX) { |
Jeff Cody | e8d4e5f | 2013-04-29 14:48:18 -0400 | [diff] [blame] | 806 | ret = -EINVAL; |
| 807 | goto exit; |
| 808 | } |
| 809 | |
Jeff Cody | 1d7678d | 2014-03-26 13:05:39 +0100 | [diff] [blame] | 810 | /* only 2 supported sector sizes */ |
| 811 | if (s->logical_sector_size != 512 && s->logical_sector_size != 4096) { |
| 812 | ret = -EINVAL; |
| 813 | goto exit; |
| 814 | } |
| 815 | |
| 816 | /* Both block_size and sector_size are guaranteed powers of 2, below. |
| 817 | Due to range checks above, s->sectors_per_block can never be < 256 */ |
Jeff Cody | e8d4e5f | 2013-04-29 14:48:18 -0400 | [diff] [blame] | 818 | s->sectors_per_block = s->params.block_size / s->logical_sector_size; |
| 819 | s->chunk_ratio = (VHDX_MAX_SECTORS_PER_BLOCK) * |
| 820 | (uint64_t)s->logical_sector_size / |
| 821 | (uint64_t)s->params.block_size; |
| 822 | |
| 823 | /* These values are ones we will want to use for division / multiplication |
| 824 | * later on, and they are all guaranteed (per the spec) to be powers of 2, |
| 825 | * so we can take advantage of that for shift operations during |
| 826 | * reads/writes */ |
| 827 | if (s->logical_sector_size & (s->logical_sector_size - 1)) { |
| 828 | ret = -EINVAL; |
| 829 | goto exit; |
| 830 | } |
| 831 | if (s->sectors_per_block & (s->sectors_per_block - 1)) { |
| 832 | ret = -EINVAL; |
| 833 | goto exit; |
| 834 | } |
| 835 | if (s->chunk_ratio & (s->chunk_ratio - 1)) { |
| 836 | ret = -EINVAL; |
| 837 | goto exit; |
| 838 | } |
| 839 | s->block_size = s->params.block_size; |
| 840 | if (s->block_size & (s->block_size - 1)) { |
| 841 | ret = -EINVAL; |
| 842 | goto exit; |
| 843 | } |
| 844 | |
Jeff Cody | 1e74a97 | 2013-10-30 10:44:51 -0400 | [diff] [blame] | 845 | vhdx_set_shift_bits(s); |
Jeff Cody | e8d4e5f | 2013-04-29 14:48:18 -0400 | [diff] [blame] | 846 | |
| 847 | ret = 0; |
| 848 | |
| 849 | exit: |
| 850 | qemu_vfree(buffer); |
| 851 | return ret; |
| 852 | } |
| 853 | |
Jeff Cody | 1e74a97 | 2013-10-30 10:44:51 -0400 | [diff] [blame] | 854 | /* |
| 855 | * Calculate the number of BAT entries, including sector |
| 856 | * bitmap entries. |
| 857 | */ |
| 858 | static void vhdx_calc_bat_entries(BDRVVHDXState *s) |
| 859 | { |
| 860 | uint32_t data_blocks_cnt, bitmap_blocks_cnt; |
| 861 | |
Max Reitz | 939901d | 2015-12-18 16:04:25 +0100 | [diff] [blame] | 862 | data_blocks_cnt = DIV_ROUND_UP(s->virtual_disk_size, s->block_size); |
| 863 | bitmap_blocks_cnt = DIV_ROUND_UP(data_blocks_cnt, s->chunk_ratio); |
Jeff Cody | 1e74a97 | 2013-10-30 10:44:51 -0400 | [diff] [blame] | 864 | |
| 865 | if (s->parent_entries) { |
| 866 | s->bat_entries = bitmap_blocks_cnt * (s->chunk_ratio + 1); |
| 867 | } else { |
| 868 | s->bat_entries = data_blocks_cnt + |
| 869 | ((data_blocks_cnt - 1) >> s->chunk_ratio_bits); |
| 870 | } |
| 871 | |
| 872 | } |
Jeff Cody | e8d4e5f | 2013-04-29 14:48:18 -0400 | [diff] [blame] | 873 | |
Jeff Cody | c46415a | 2013-10-30 10:44:44 -0400 | [diff] [blame] | 874 | static void vhdx_close(BlockDriverState *bs) |
| 875 | { |
| 876 | BDRVVHDXState *s = bs->opaque; |
| 877 | qemu_vfree(s->headers[0]); |
Jeff Cody | 0a43a1b | 2013-10-30 10:44:45 -0400 | [diff] [blame] | 878 | s->headers[0] = NULL; |
Jeff Cody | c46415a | 2013-10-30 10:44:44 -0400 | [diff] [blame] | 879 | qemu_vfree(s->headers[1]); |
Jeff Cody | 0a43a1b | 2013-10-30 10:44:45 -0400 | [diff] [blame] | 880 | s->headers[1] = NULL; |
Jeff Cody | c46415a | 2013-10-30 10:44:44 -0400 | [diff] [blame] | 881 | qemu_vfree(s->bat); |
Jeff Cody | 0a43a1b | 2013-10-30 10:44:45 -0400 | [diff] [blame] | 882 | s->bat = NULL; |
Jeff Cody | c46415a | 2013-10-30 10:44:44 -0400 | [diff] [blame] | 883 | qemu_vfree(s->parent_entries); |
Jeff Cody | 0a43a1b | 2013-10-30 10:44:45 -0400 | [diff] [blame] | 884 | s->parent_entries = NULL; |
Jeff Cody | c46415a | 2013-10-30 10:44:44 -0400 | [diff] [blame] | 885 | migrate_del_blocker(s->migration_blocker); |
| 886 | error_free(s->migration_blocker); |
Jeff Cody | 0a43a1b | 2013-10-30 10:44:45 -0400 | [diff] [blame] | 887 | qemu_vfree(s->log.hdr); |
| 888 | s->log.hdr = NULL; |
Jeff Cody | 1a848fd | 2013-10-30 10:44:46 -0400 | [diff] [blame] | 889 | vhdx_region_unregister_all(s); |
Jeff Cody | c46415a | 2013-10-30 10:44:44 -0400 | [diff] [blame] | 890 | } |
| 891 | |
Max Reitz | 015a103 | 2013-09-05 14:22:29 +0200 | [diff] [blame] | 892 | static int vhdx_open(BlockDriverState *bs, QDict *options, int flags, |
| 893 | Error **errp) |
Jeff Cody | e8d4e5f | 2013-04-29 14:48:18 -0400 | [diff] [blame] | 894 | { |
| 895 | BDRVVHDXState *s = bs->opaque; |
| 896 | int ret = 0; |
| 897 | uint32_t i; |
| 898 | uint64_t signature; |
Paolo Bonzini | 6890aad | 2014-02-17 14:44:00 +0100 | [diff] [blame] | 899 | Error *local_err = NULL; |
Jeff Cody | e8d4e5f | 2013-04-29 14:48:18 -0400 | [diff] [blame] | 900 | |
Kevin Wolf | 4e4bf5c | 2016-12-16 18:52:37 +0100 | [diff] [blame] | 901 | bs->file = bdrv_open_child(NULL, options, "file", bs, &child_file, |
| 902 | false, errp); |
| 903 | if (!bs->file) { |
| 904 | return -EINVAL; |
| 905 | } |
| 906 | |
Jeff Cody | e8d4e5f | 2013-04-29 14:48:18 -0400 | [diff] [blame] | 907 | s->bat = NULL; |
Jeff Cody | c3906c5 | 2013-10-30 10:44:43 -0400 | [diff] [blame] | 908 | s->first_visible_write = true; |
Jeff Cody | e8d4e5f | 2013-04-29 14:48:18 -0400 | [diff] [blame] | 909 | |
| 910 | qemu_co_mutex_init(&s->lock); |
Jeff Cody | 1a848fd | 2013-10-30 10:44:46 -0400 | [diff] [blame] | 911 | QLIST_INIT(&s->regions); |
Jeff Cody | e8d4e5f | 2013-04-29 14:48:18 -0400 | [diff] [blame] | 912 | |
| 913 | /* validate the file signature */ |
Kevin Wolf | cf2ab8f | 2016-06-20 18:24:02 +0200 | [diff] [blame] | 914 | ret = bdrv_pread(bs->file, 0, &signature, sizeof(uint64_t)); |
Jeff Cody | e8d4e5f | 2013-04-29 14:48:18 -0400 | [diff] [blame] | 915 | if (ret < 0) { |
| 916 | goto fail; |
| 917 | } |
| 918 | if (memcmp(&signature, "vhdxfile", 8)) { |
| 919 | ret = -EINVAL; |
| 920 | goto fail; |
| 921 | } |
| 922 | |
Jeff Cody | 4f18b78 | 2013-10-30 10:44:39 -0400 | [diff] [blame] | 923 | /* This is used for any header updates, for the file_write_guid. |
| 924 | * The spec dictates that a new value should be used for the first |
| 925 | * header update */ |
| 926 | vhdx_guid_generate(&s->session_guid); |
| 927 | |
Paolo Bonzini | 6890aad | 2014-02-17 14:44:00 +0100 | [diff] [blame] | 928 | vhdx_parse_header(bs, s, &local_err); |
| 929 | if (local_err != NULL) { |
| 930 | error_propagate(errp, local_err); |
| 931 | ret = -EINVAL; |
Jeff Cody | e8d4e5f | 2013-04-29 14:48:18 -0400 | [diff] [blame] | 932 | goto fail; |
| 933 | } |
| 934 | |
Jeff Cody | 7e30e6a | 2013-12-17 05:33:37 -0500 | [diff] [blame] | 935 | ret = vhdx_parse_log(bs, s, &s->log_replayed_on_open, errp); |
Jeff Cody | 0a43a1b | 2013-10-30 10:44:45 -0400 | [diff] [blame] | 936 | if (ret < 0) { |
Jeff Cody | e8d4e5f | 2013-04-29 14:48:18 -0400 | [diff] [blame] | 937 | goto fail; |
| 938 | } |
| 939 | |
| 940 | ret = vhdx_open_region_tables(bs, s); |
Jeff Cody | 0a43a1b | 2013-10-30 10:44:45 -0400 | [diff] [blame] | 941 | if (ret < 0) { |
Jeff Cody | e8d4e5f | 2013-04-29 14:48:18 -0400 | [diff] [blame] | 942 | goto fail; |
| 943 | } |
| 944 | |
| 945 | ret = vhdx_parse_metadata(bs, s); |
Jeff Cody | 0a43a1b | 2013-10-30 10:44:45 -0400 | [diff] [blame] | 946 | if (ret < 0) { |
Jeff Cody | e8d4e5f | 2013-04-29 14:48:18 -0400 | [diff] [blame] | 947 | goto fail; |
| 948 | } |
Jeff Cody | 0a43a1b | 2013-10-30 10:44:45 -0400 | [diff] [blame] | 949 | |
Jeff Cody | e8d4e5f | 2013-04-29 14:48:18 -0400 | [diff] [blame] | 950 | s->block_size = s->params.block_size; |
| 951 | |
| 952 | /* the VHDX spec dictates that virtual_disk_size is always a multiple of |
| 953 | * logical_sector_size */ |
| 954 | bs->total_sectors = s->virtual_disk_size >> s->logical_sector_size_bits; |
| 955 | |
Jeff Cody | 1e74a97 | 2013-10-30 10:44:51 -0400 | [diff] [blame] | 956 | vhdx_calc_bat_entries(s); |
Jeff Cody | e8d4e5f | 2013-04-29 14:48:18 -0400 | [diff] [blame] | 957 | |
| 958 | s->bat_offset = s->bat_rt.file_offset; |
| 959 | |
| 960 | if (s->bat_entries > s->bat_rt.length / sizeof(VHDXBatEntry)) { |
| 961 | /* BAT allocation is not large enough for all entries */ |
| 962 | ret = -EINVAL; |
| 963 | goto fail; |
| 964 | } |
| 965 | |
Jeff Cody | 6e9d290 | 2013-10-30 10:44:38 -0400 | [diff] [blame] | 966 | /* s->bat is freed in vhdx_close() */ |
Kevin Wolf | 9a4f4c3 | 2015-06-16 14:19:22 +0200 | [diff] [blame] | 967 | s->bat = qemu_try_blockalign(bs->file->bs, s->bat_rt.length); |
Kevin Wolf | a67e128 | 2014-05-20 13:55:50 +0200 | [diff] [blame] | 968 | if (s->bat == NULL) { |
| 969 | ret = -ENOMEM; |
| 970 | goto fail; |
| 971 | } |
| 972 | |
Kevin Wolf | cf2ab8f | 2016-06-20 18:24:02 +0200 | [diff] [blame] | 973 | ret = bdrv_pread(bs->file, s->bat_offset, s->bat, s->bat_rt.length); |
Jeff Cody | e8d4e5f | 2013-04-29 14:48:18 -0400 | [diff] [blame] | 974 | if (ret < 0) { |
| 975 | goto fail; |
| 976 | } |
| 977 | |
Jeff Cody | 1a848fd | 2013-10-30 10:44:46 -0400 | [diff] [blame] | 978 | uint64_t payblocks = s->chunk_ratio; |
| 979 | /* endian convert, and verify populated BAT field file offsets against |
| 980 | * region table and log entries */ |
Jeff Cody | e8d4e5f | 2013-04-29 14:48:18 -0400 | [diff] [blame] | 981 | for (i = 0; i < s->bat_entries; i++) { |
| 982 | le64_to_cpus(&s->bat[i]); |
Jeff Cody | 1a848fd | 2013-10-30 10:44:46 -0400 | [diff] [blame] | 983 | if (payblocks--) { |
| 984 | /* payload bat entries */ |
| 985 | if ((s->bat[i] & VHDX_BAT_STATE_BIT_MASK) == |
Jeff Cody | d92aa88 | 2013-10-30 10:44:48 -0400 | [diff] [blame] | 986 | PAYLOAD_BLOCK_FULLY_PRESENT) { |
Jeff Cody | 1a848fd | 2013-10-30 10:44:46 -0400 | [diff] [blame] | 987 | ret = vhdx_region_check(s, s->bat[i] & VHDX_BAT_FILE_OFF_MASK, |
| 988 | s->block_size); |
| 989 | if (ret < 0) { |
| 990 | goto fail; |
| 991 | } |
| 992 | } |
| 993 | } else { |
| 994 | payblocks = s->chunk_ratio; |
| 995 | /* Once differencing files are supported, verify sector bitmap |
| 996 | * blocks here */ |
| 997 | } |
Jeff Cody | e8d4e5f | 2013-04-29 14:48:18 -0400 | [diff] [blame] | 998 | } |
| 999 | |
Ashijeet Acharya | fe44dc9 | 2017-01-16 17:01:53 +0530 | [diff] [blame] | 1000 | /* Disable migration when VHDX images are used */ |
| 1001 | error_setg(&s->migration_blocker, "The vhdx format used by node '%s' " |
| 1002 | "does not support live migration", |
| 1003 | bdrv_get_device_or_node_name(bs)); |
| 1004 | ret = migrate_add_blocker(s->migration_blocker, &local_err); |
| 1005 | if (local_err) { |
| 1006 | error_propagate(errp, local_err); |
| 1007 | error_free(s->migration_blocker); |
| 1008 | goto fail; |
| 1009 | } |
| 1010 | |
Jeff Cody | e8d4e5f | 2013-04-29 14:48:18 -0400 | [diff] [blame] | 1011 | if (flags & BDRV_O_RDWR) { |
Jeff Cody | c3906c5 | 2013-10-30 10:44:43 -0400 | [diff] [blame] | 1012 | ret = vhdx_update_headers(bs, s, false, NULL); |
Jeff Cody | 4f18b78 | 2013-10-30 10:44:39 -0400 | [diff] [blame] | 1013 | if (ret < 0) { |
| 1014 | goto fail; |
| 1015 | } |
Jeff Cody | e8d4e5f | 2013-04-29 14:48:18 -0400 | [diff] [blame] | 1016 | } |
| 1017 | |
Jeff Cody | d92aa88 | 2013-10-30 10:44:48 -0400 | [diff] [blame] | 1018 | /* TODO: differencing files */ |
Jeff Cody | e8d4e5f | 2013-04-29 14:48:18 -0400 | [diff] [blame] | 1019 | |
| 1020 | return 0; |
| 1021 | fail: |
Jeff Cody | 0a43a1b | 2013-10-30 10:44:45 -0400 | [diff] [blame] | 1022 | vhdx_close(bs); |
Jeff Cody | e8d4e5f | 2013-04-29 14:48:18 -0400 | [diff] [blame] | 1023 | return ret; |
| 1024 | } |
| 1025 | |
| 1026 | static int vhdx_reopen_prepare(BDRVReopenState *state, |
| 1027 | BlockReopenQueue *queue, Error **errp) |
| 1028 | { |
| 1029 | return 0; |
| 1030 | } |
| 1031 | |
| 1032 | |
Jeff Cody | 059e2fb | 2013-04-29 14:48:19 -0400 | [diff] [blame] | 1033 | /* |
| 1034 | * Perform sector to block offset translations, to get various |
| 1035 | * sector and file offsets into the image. See VHDXSectorInfo |
| 1036 | */ |
| 1037 | static void vhdx_block_translate(BDRVVHDXState *s, int64_t sector_num, |
| 1038 | int nb_sectors, VHDXSectorInfo *sinfo) |
| 1039 | { |
| 1040 | uint32_t block_offset; |
| 1041 | |
| 1042 | sinfo->bat_idx = sector_num >> s->sectors_per_block_bits; |
| 1043 | /* effectively a modulo - this gives us the offset into the block |
| 1044 | * (in sector sizes) for our sector number */ |
| 1045 | block_offset = sector_num - (sinfo->bat_idx << s->sectors_per_block_bits); |
| 1046 | /* the chunk ratio gives us the interleaving of the sector |
| 1047 | * bitmaps, so we need to advance our page block index by the |
| 1048 | * sector bitmaps entry number */ |
| 1049 | sinfo->bat_idx += sinfo->bat_idx >> s->chunk_ratio_bits; |
| 1050 | |
| 1051 | /* the number of sectors we can read/write in this cycle */ |
| 1052 | sinfo->sectors_avail = s->sectors_per_block - block_offset; |
| 1053 | |
| 1054 | sinfo->bytes_left = sinfo->sectors_avail << s->logical_sector_size_bits; |
| 1055 | |
| 1056 | if (sinfo->sectors_avail > nb_sectors) { |
| 1057 | sinfo->sectors_avail = nb_sectors; |
| 1058 | } |
| 1059 | |
| 1060 | sinfo->bytes_avail = sinfo->sectors_avail << s->logical_sector_size_bits; |
| 1061 | |
Jeff Cody | 0b7da09 | 2013-10-30 10:44:49 -0400 | [diff] [blame] | 1062 | sinfo->file_offset = s->bat[sinfo->bat_idx] & VHDX_BAT_FILE_OFF_MASK; |
Jeff Cody | 059e2fb | 2013-04-29 14:48:19 -0400 | [diff] [blame] | 1063 | |
| 1064 | sinfo->block_offset = block_offset << s->logical_sector_size_bits; |
| 1065 | |
| 1066 | /* The file offset must be past the header section, so must be > 0 */ |
| 1067 | if (sinfo->file_offset == 0) { |
| 1068 | return; |
| 1069 | } |
| 1070 | |
| 1071 | /* block offset is the offset in vhdx logical sectors, in |
| 1072 | * the payload data block. Convert that to a byte offset |
| 1073 | * in the block, and add in the payload data block offset |
| 1074 | * in the file, in bytes, to get the final read address */ |
| 1075 | |
Jeff Cody | 059e2fb | 2013-04-29 14:48:19 -0400 | [diff] [blame] | 1076 | sinfo->file_offset += sinfo->block_offset; |
| 1077 | } |
| 1078 | |
| 1079 | |
Paolo Bonzini | 97b00e2 | 2013-11-22 13:39:49 +0100 | [diff] [blame] | 1080 | static int vhdx_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) |
| 1081 | { |
| 1082 | BDRVVHDXState *s = bs->opaque; |
| 1083 | |
| 1084 | bdi->cluster_size = s->block_size; |
| 1085 | |
Paolo Bonzini | 95de6d7 | 2013-11-22 13:39:50 +0100 | [diff] [blame] | 1086 | bdi->unallocated_blocks_are_zero = |
| 1087 | (s->params.data_bits & VHDX_PARAMS_HAS_PARENT) == 0; |
| 1088 | |
Paolo Bonzini | 97b00e2 | 2013-11-22 13:39:49 +0100 | [diff] [blame] | 1089 | return 0; |
| 1090 | } |
| 1091 | |
Jeff Cody | 059e2fb | 2013-04-29 14:48:19 -0400 | [diff] [blame] | 1092 | |
Jeff Cody | e8d4e5f | 2013-04-29 14:48:18 -0400 | [diff] [blame] | 1093 | static coroutine_fn int vhdx_co_readv(BlockDriverState *bs, int64_t sector_num, |
| 1094 | int nb_sectors, QEMUIOVector *qiov) |
| 1095 | { |
Jeff Cody | 059e2fb | 2013-04-29 14:48:19 -0400 | [diff] [blame] | 1096 | BDRVVHDXState *s = bs->opaque; |
| 1097 | int ret = 0; |
| 1098 | VHDXSectorInfo sinfo; |
| 1099 | uint64_t bytes_done = 0; |
| 1100 | QEMUIOVector hd_qiov; |
| 1101 | |
| 1102 | qemu_iovec_init(&hd_qiov, qiov->niov); |
| 1103 | |
| 1104 | qemu_co_mutex_lock(&s->lock); |
| 1105 | |
| 1106 | while (nb_sectors > 0) { |
| 1107 | /* We are a differencing file, so we need to inspect the sector bitmap |
| 1108 | * to see if we have the data or not */ |
| 1109 | if (s->params.data_bits & VHDX_PARAMS_HAS_PARENT) { |
| 1110 | /* not supported yet */ |
| 1111 | ret = -ENOTSUP; |
| 1112 | goto exit; |
| 1113 | } else { |
| 1114 | vhdx_block_translate(s, sector_num, nb_sectors, &sinfo); |
| 1115 | |
| 1116 | qemu_iovec_reset(&hd_qiov); |
| 1117 | qemu_iovec_concat(&hd_qiov, qiov, bytes_done, sinfo.bytes_avail); |
| 1118 | |
| 1119 | /* check the payload block state */ |
| 1120 | switch (s->bat[sinfo.bat_idx] & VHDX_BAT_STATE_BIT_MASK) { |
| 1121 | case PAYLOAD_BLOCK_NOT_PRESENT: /* fall through */ |
Jeff Cody | 0571df4 | 2014-12-08 01:07:42 -0500 | [diff] [blame] | 1122 | case PAYLOAD_BLOCK_UNDEFINED: |
| 1123 | case PAYLOAD_BLOCK_UNMAPPED: |
Jeff Cody | a9d1e9d | 2014-12-08 01:07:43 -0500 | [diff] [blame] | 1124 | case PAYLOAD_BLOCK_UNMAPPED_v095: |
Jeff Cody | 059e2fb | 2013-04-29 14:48:19 -0400 | [diff] [blame] | 1125 | case PAYLOAD_BLOCK_ZERO: |
| 1126 | /* return zero */ |
| 1127 | qemu_iovec_memset(&hd_qiov, 0, 0, sinfo.bytes_avail); |
| 1128 | break; |
Jeff Cody | d92aa88 | 2013-10-30 10:44:48 -0400 | [diff] [blame] | 1129 | case PAYLOAD_BLOCK_FULLY_PRESENT: |
Jeff Cody | 059e2fb | 2013-04-29 14:48:19 -0400 | [diff] [blame] | 1130 | qemu_co_mutex_unlock(&s->lock); |
Kevin Wolf | 28b04a8 | 2016-05-24 17:21:22 +0200 | [diff] [blame] | 1131 | ret = bdrv_co_readv(bs->file, |
Jeff Cody | 059e2fb | 2013-04-29 14:48:19 -0400 | [diff] [blame] | 1132 | sinfo.file_offset >> BDRV_SECTOR_BITS, |
| 1133 | sinfo.sectors_avail, &hd_qiov); |
| 1134 | qemu_co_mutex_lock(&s->lock); |
| 1135 | if (ret < 0) { |
| 1136 | goto exit; |
| 1137 | } |
| 1138 | break; |
| 1139 | case PAYLOAD_BLOCK_PARTIALLY_PRESENT: |
| 1140 | /* we don't yet support difference files, fall through |
| 1141 | * to error */ |
| 1142 | default: |
| 1143 | ret = -EIO; |
| 1144 | goto exit; |
| 1145 | break; |
| 1146 | } |
| 1147 | nb_sectors -= sinfo.sectors_avail; |
| 1148 | sector_num += sinfo.sectors_avail; |
| 1149 | bytes_done += sinfo.bytes_avail; |
| 1150 | } |
| 1151 | } |
| 1152 | ret = 0; |
| 1153 | exit: |
| 1154 | qemu_co_mutex_unlock(&s->lock); |
| 1155 | qemu_iovec_destroy(&hd_qiov); |
| 1156 | return ret; |
Jeff Cody | e8d4e5f | 2013-04-29 14:48:18 -0400 | [diff] [blame] | 1157 | } |
| 1158 | |
Jeff Cody | d92aa88 | 2013-10-30 10:44:48 -0400 | [diff] [blame] | 1159 | /* |
| 1160 | * Allocate a new payload block at the end of the file. |
| 1161 | * |
| 1162 | * Allocation will happen at 1MB alignment inside the file |
| 1163 | * |
| 1164 | * Returns the file offset start of the new payload block |
| 1165 | */ |
| 1166 | static int vhdx_allocate_block(BlockDriverState *bs, BDRVVHDXState *s, |
| 1167 | uint64_t *new_offset) |
| 1168 | { |
Kevin Wolf | 9a4f4c3 | 2015-06-16 14:19:22 +0200 | [diff] [blame] | 1169 | *new_offset = bdrv_getlength(bs->file->bs); |
Jeff Cody | e8d4e5f | 2013-04-29 14:48:18 -0400 | [diff] [blame] | 1170 | |
Jeff Cody | d92aa88 | 2013-10-30 10:44:48 -0400 | [diff] [blame] | 1171 | /* per the spec, the address for a block is in units of 1MB */ |
| 1172 | *new_offset = ROUND_UP(*new_offset, 1024 * 1024); |
| 1173 | |
Kevin Wolf | 52cdbc5 | 2017-02-16 18:39:03 +0100 | [diff] [blame] | 1174 | return bdrv_truncate(bs->file, *new_offset + s->block_size); |
Jeff Cody | d92aa88 | 2013-10-30 10:44:48 -0400 | [diff] [blame] | 1175 | } |
| 1176 | |
| 1177 | /* |
| 1178 | * Update the BAT table entry with the new file offset, and the new entry |
| 1179 | * state */ |
| 1180 | static void vhdx_update_bat_table_entry(BlockDriverState *bs, BDRVVHDXState *s, |
| 1181 | VHDXSectorInfo *sinfo, |
| 1182 | uint64_t *bat_entry_le, |
| 1183 | uint64_t *bat_offset, int state) |
| 1184 | { |
| 1185 | /* The BAT entry is a uint64, with 44 bits for the file offset in units of |
| 1186 | * 1MB, and 3 bits for the block state. */ |
Jeff Cody | cdf9634 | 2015-01-20 16:01:43 -0500 | [diff] [blame] | 1187 | if ((state == PAYLOAD_BLOCK_ZERO) || |
| 1188 | (state == PAYLOAD_BLOCK_UNDEFINED) || |
| 1189 | (state == PAYLOAD_BLOCK_NOT_PRESENT) || |
| 1190 | (state == PAYLOAD_BLOCK_UNMAPPED)) { |
| 1191 | s->bat[sinfo->bat_idx] = 0; /* For PAYLOAD_BLOCK_ZERO, the |
| 1192 | FileOffsetMB field is denoted as |
| 1193 | 'reserved' in the v1.0 spec. If it is |
| 1194 | non-zero, MS Hyper-V will fail to read |
| 1195 | the disk image */ |
| 1196 | } else { |
| 1197 | s->bat[sinfo->bat_idx] = sinfo->file_offset; |
| 1198 | } |
Jeff Cody | d92aa88 | 2013-10-30 10:44:48 -0400 | [diff] [blame] | 1199 | |
| 1200 | s->bat[sinfo->bat_idx] |= state & VHDX_BAT_STATE_BIT_MASK; |
| 1201 | |
| 1202 | *bat_entry_le = cpu_to_le64(s->bat[sinfo->bat_idx]); |
| 1203 | *bat_offset = s->bat_offset + sinfo->bat_idx * sizeof(VHDXBatEntry); |
| 1204 | |
| 1205 | } |
Jeff Cody | e8d4e5f | 2013-04-29 14:48:18 -0400 | [diff] [blame] | 1206 | |
Jeff Cody | c3906c5 | 2013-10-30 10:44:43 -0400 | [diff] [blame] | 1207 | /* Per the spec, on the first write of guest-visible data to the file the |
| 1208 | * data write guid must be updated in the header */ |
| 1209 | int vhdx_user_visible_write(BlockDriverState *bs, BDRVVHDXState *s) |
| 1210 | { |
| 1211 | int ret = 0; |
| 1212 | if (s->first_visible_write) { |
| 1213 | s->first_visible_write = false; |
| 1214 | ret = vhdx_update_headers(bs, s, true, NULL); |
| 1215 | } |
| 1216 | return ret; |
| 1217 | } |
| 1218 | |
Jeff Cody | e8d4e5f | 2013-04-29 14:48:18 -0400 | [diff] [blame] | 1219 | static coroutine_fn int vhdx_co_writev(BlockDriverState *bs, int64_t sector_num, |
| 1220 | int nb_sectors, QEMUIOVector *qiov) |
| 1221 | { |
Jeff Cody | d92aa88 | 2013-10-30 10:44:48 -0400 | [diff] [blame] | 1222 | int ret = -ENOTSUP; |
| 1223 | BDRVVHDXState *s = bs->opaque; |
| 1224 | VHDXSectorInfo sinfo; |
| 1225 | uint64_t bytes_done = 0; |
| 1226 | uint64_t bat_entry = 0; |
| 1227 | uint64_t bat_entry_offset = 0; |
| 1228 | QEMUIOVector hd_qiov; |
| 1229 | struct iovec iov1 = { 0 }; |
| 1230 | struct iovec iov2 = { 0 }; |
| 1231 | int sectors_to_write; |
| 1232 | int bat_state; |
| 1233 | uint64_t bat_prior_offset = 0; |
| 1234 | bool bat_update = false; |
| 1235 | |
| 1236 | qemu_iovec_init(&hd_qiov, qiov->niov); |
| 1237 | |
| 1238 | qemu_co_mutex_lock(&s->lock); |
| 1239 | |
| 1240 | ret = vhdx_user_visible_write(bs, s); |
| 1241 | if (ret < 0) { |
| 1242 | goto exit; |
| 1243 | } |
| 1244 | |
| 1245 | while (nb_sectors > 0) { |
| 1246 | bool use_zero_buffers = false; |
| 1247 | bat_update = false; |
| 1248 | if (s->params.data_bits & VHDX_PARAMS_HAS_PARENT) { |
| 1249 | /* not supported yet */ |
| 1250 | ret = -ENOTSUP; |
| 1251 | goto exit; |
| 1252 | } else { |
| 1253 | vhdx_block_translate(s, sector_num, nb_sectors, &sinfo); |
| 1254 | sectors_to_write = sinfo.sectors_avail; |
| 1255 | |
| 1256 | qemu_iovec_reset(&hd_qiov); |
| 1257 | /* check the payload block state */ |
| 1258 | bat_state = s->bat[sinfo.bat_idx] & VHDX_BAT_STATE_BIT_MASK; |
| 1259 | switch (bat_state) { |
| 1260 | case PAYLOAD_BLOCK_ZERO: |
| 1261 | /* in this case, we need to preserve zero writes for |
| 1262 | * data that is not part of this write, so we must pad |
| 1263 | * the rest of the buffer to zeroes */ |
| 1264 | |
| 1265 | /* if we are on a posix system with ftruncate() that extends |
| 1266 | * a file, then it is zero-filled for us. On Win32, the raw |
| 1267 | * layer uses SetFilePointer and SetFileEnd, which does not |
| 1268 | * zero fill AFAIK */ |
| 1269 | |
| 1270 | /* Queue another write of zero buffers if the underlying file |
| 1271 | * does not zero-fill on file extension */ |
| 1272 | |
Kevin Wolf | 9a4f4c3 | 2015-06-16 14:19:22 +0200 | [diff] [blame] | 1273 | if (bdrv_has_zero_init(bs->file->bs) == 0) { |
Jeff Cody | d92aa88 | 2013-10-30 10:44:48 -0400 | [diff] [blame] | 1274 | use_zero_buffers = true; |
| 1275 | |
| 1276 | /* zero fill the front, if any */ |
| 1277 | if (sinfo.block_offset) { |
| 1278 | iov1.iov_len = sinfo.block_offset; |
| 1279 | iov1.iov_base = qemu_blockalign(bs, iov1.iov_len); |
| 1280 | memset(iov1.iov_base, 0, iov1.iov_len); |
| 1281 | qemu_iovec_concat_iov(&hd_qiov, &iov1, 1, 0, |
Kevin Wolf | d1a126c | 2015-04-14 16:36:16 +0200 | [diff] [blame] | 1282 | iov1.iov_len); |
Jeff Cody | d92aa88 | 2013-10-30 10:44:48 -0400 | [diff] [blame] | 1283 | sectors_to_write += iov1.iov_len >> BDRV_SECTOR_BITS; |
| 1284 | } |
| 1285 | |
| 1286 | /* our actual data */ |
| 1287 | qemu_iovec_concat(&hd_qiov, qiov, bytes_done, |
| 1288 | sinfo.bytes_avail); |
| 1289 | |
| 1290 | /* zero fill the back, if any */ |
| 1291 | if ((sinfo.bytes_avail - sinfo.block_offset) < |
| 1292 | s->block_size) { |
| 1293 | iov2.iov_len = s->block_size - |
| 1294 | (sinfo.bytes_avail + sinfo.block_offset); |
| 1295 | iov2.iov_base = qemu_blockalign(bs, iov2.iov_len); |
| 1296 | memset(iov2.iov_base, 0, iov2.iov_len); |
| 1297 | qemu_iovec_concat_iov(&hd_qiov, &iov2, 1, 0, |
Kevin Wolf | d1a126c | 2015-04-14 16:36:16 +0200 | [diff] [blame] | 1298 | iov2.iov_len); |
Jeff Cody | d92aa88 | 2013-10-30 10:44:48 -0400 | [diff] [blame] | 1299 | sectors_to_write += iov2.iov_len >> BDRV_SECTOR_BITS; |
| 1300 | } |
| 1301 | } |
Jeff Cody | d92aa88 | 2013-10-30 10:44:48 -0400 | [diff] [blame] | 1302 | /* fall through */ |
| 1303 | case PAYLOAD_BLOCK_NOT_PRESENT: /* fall through */ |
Jeff Cody | 0571df4 | 2014-12-08 01:07:42 -0500 | [diff] [blame] | 1304 | case PAYLOAD_BLOCK_UNMAPPED: |
Jeff Cody | a9d1e9d | 2014-12-08 01:07:43 -0500 | [diff] [blame] | 1305 | case PAYLOAD_BLOCK_UNMAPPED_v095: |
Jeff Cody | 0571df4 | 2014-12-08 01:07:42 -0500 | [diff] [blame] | 1306 | case PAYLOAD_BLOCK_UNDEFINED: |
Jeff Cody | d92aa88 | 2013-10-30 10:44:48 -0400 | [diff] [blame] | 1307 | bat_prior_offset = sinfo.file_offset; |
| 1308 | ret = vhdx_allocate_block(bs, s, &sinfo.file_offset); |
| 1309 | if (ret < 0) { |
| 1310 | goto exit; |
| 1311 | } |
| 1312 | /* once we support differencing files, this may also be |
| 1313 | * partially present */ |
| 1314 | /* update block state to the newly specified state */ |
| 1315 | vhdx_update_bat_table_entry(bs, s, &sinfo, &bat_entry, |
| 1316 | &bat_entry_offset, |
| 1317 | PAYLOAD_BLOCK_FULLY_PRESENT); |
| 1318 | bat_update = true; |
| 1319 | /* since we just allocated a block, file_offset is the |
| 1320 | * beginning of the payload block. It needs to be the |
| 1321 | * write address, which includes the offset into the block */ |
| 1322 | if (!use_zero_buffers) { |
| 1323 | sinfo.file_offset += sinfo.block_offset; |
| 1324 | } |
| 1325 | /* fall through */ |
| 1326 | case PAYLOAD_BLOCK_FULLY_PRESENT: |
| 1327 | /* if the file offset address is in the header zone, |
| 1328 | * there is a problem */ |
| 1329 | if (sinfo.file_offset < (1024 * 1024)) { |
| 1330 | ret = -EFAULT; |
| 1331 | goto error_bat_restore; |
| 1332 | } |
| 1333 | |
| 1334 | if (!use_zero_buffers) { |
| 1335 | qemu_iovec_concat(&hd_qiov, qiov, bytes_done, |
| 1336 | sinfo.bytes_avail); |
| 1337 | } |
| 1338 | /* block exists, so we can just overwrite it */ |
| 1339 | qemu_co_mutex_unlock(&s->lock); |
Kevin Wolf | 25ec177 | 2016-05-24 17:21:22 +0200 | [diff] [blame] | 1340 | ret = bdrv_co_writev(bs->file, |
Jeff Cody | d92aa88 | 2013-10-30 10:44:48 -0400 | [diff] [blame] | 1341 | sinfo.file_offset >> BDRV_SECTOR_BITS, |
| 1342 | sectors_to_write, &hd_qiov); |
| 1343 | qemu_co_mutex_lock(&s->lock); |
| 1344 | if (ret < 0) { |
| 1345 | goto error_bat_restore; |
| 1346 | } |
| 1347 | break; |
| 1348 | case PAYLOAD_BLOCK_PARTIALLY_PRESENT: |
| 1349 | /* we don't yet support difference files, fall through |
| 1350 | * to error */ |
| 1351 | default: |
| 1352 | ret = -EIO; |
| 1353 | goto exit; |
| 1354 | break; |
| 1355 | } |
| 1356 | |
| 1357 | if (bat_update) { |
| 1358 | /* this will update the BAT entry into the log journal, and |
| 1359 | * then flush the log journal out to disk */ |
| 1360 | ret = vhdx_log_write_and_flush(bs, s, &bat_entry, |
| 1361 | sizeof(VHDXBatEntry), |
| 1362 | bat_entry_offset); |
| 1363 | if (ret < 0) { |
| 1364 | goto exit; |
| 1365 | } |
| 1366 | } |
| 1367 | |
| 1368 | nb_sectors -= sinfo.sectors_avail; |
| 1369 | sector_num += sinfo.sectors_avail; |
| 1370 | bytes_done += sinfo.bytes_avail; |
| 1371 | |
| 1372 | } |
| 1373 | } |
| 1374 | |
| 1375 | goto exit; |
| 1376 | |
| 1377 | error_bat_restore: |
| 1378 | if (bat_update) { |
| 1379 | /* keep metadata in sync, and restore the bat entry state |
| 1380 | * if error. */ |
| 1381 | sinfo.file_offset = bat_prior_offset; |
| 1382 | vhdx_update_bat_table_entry(bs, s, &sinfo, &bat_entry, |
| 1383 | &bat_entry_offset, bat_state); |
| 1384 | } |
| 1385 | exit: |
| 1386 | qemu_vfree(iov1.iov_base); |
| 1387 | qemu_vfree(iov2.iov_base); |
| 1388 | qemu_co_mutex_unlock(&s->lock); |
| 1389 | qemu_iovec_destroy(&hd_qiov); |
| 1390 | return ret; |
Jeff Cody | e8d4e5f | 2013-04-29 14:48:18 -0400 | [diff] [blame] | 1391 | } |
| 1392 | |
| 1393 | |
Jeff Cody | 3412f7b | 2013-10-30 10:44:53 -0400 | [diff] [blame] | 1394 | |
| 1395 | /* |
| 1396 | * Create VHDX Headers |
| 1397 | * |
| 1398 | * There are 2 headers, and the highest sequence number will represent |
| 1399 | * the active header |
| 1400 | */ |
Kevin Wolf | db1e80e | 2016-06-20 22:05:39 +0200 | [diff] [blame] | 1401 | static int vhdx_create_new_headers(BlockBackend *blk, uint64_t image_size, |
Jeff Cody | 3412f7b | 2013-10-30 10:44:53 -0400 | [diff] [blame] | 1402 | uint32_t log_size) |
| 1403 | { |
Kevin Wolf | db1e80e | 2016-06-20 22:05:39 +0200 | [diff] [blame] | 1404 | BlockDriverState *bs = blk_bs(blk); |
Kevin Wolf | cf2ab8f | 2016-06-20 18:24:02 +0200 | [diff] [blame] | 1405 | BdrvChild *child; |
Jeff Cody | 3412f7b | 2013-10-30 10:44:53 -0400 | [diff] [blame] | 1406 | int ret = 0; |
| 1407 | VHDXHeader *hdr = NULL; |
| 1408 | |
Markus Armbruster | 5839e53 | 2014-08-19 10:31:08 +0200 | [diff] [blame] | 1409 | hdr = g_new0(VHDXHeader, 1); |
Jeff Cody | 3412f7b | 2013-10-30 10:44:53 -0400 | [diff] [blame] | 1410 | |
| 1411 | hdr->signature = VHDX_HEADER_SIGNATURE; |
| 1412 | hdr->sequence_number = g_random_int(); |
| 1413 | hdr->log_version = 0; |
| 1414 | hdr->version = 1; |
| 1415 | hdr->log_length = log_size; |
| 1416 | hdr->log_offset = VHDX_HEADER_SECTION_END; |
| 1417 | vhdx_guid_generate(&hdr->file_write_guid); |
| 1418 | vhdx_guid_generate(&hdr->data_write_guid); |
| 1419 | |
Kevin Wolf | cf2ab8f | 2016-06-20 18:24:02 +0200 | [diff] [blame] | 1420 | /* XXX Ugly way to get blk->root, but that's a feature, not a bug. This |
| 1421 | * hack makes it obvious that vhdx_write_header() bypasses the BlockBackend |
| 1422 | * here, which it really shouldn't be doing. */ |
| 1423 | child = QLIST_FIRST(&bs->parents); |
| 1424 | assert(!QLIST_NEXT(child, next_parent)); |
| 1425 | |
| 1426 | ret = vhdx_write_header(child, hdr, VHDX_HEADER1_OFFSET, false); |
Jeff Cody | 3412f7b | 2013-10-30 10:44:53 -0400 | [diff] [blame] | 1427 | if (ret < 0) { |
| 1428 | goto exit; |
| 1429 | } |
| 1430 | hdr->sequence_number++; |
Kevin Wolf | cf2ab8f | 2016-06-20 18:24:02 +0200 | [diff] [blame] | 1431 | ret = vhdx_write_header(child, hdr, VHDX_HEADER2_OFFSET, false); |
Jeff Cody | 3412f7b | 2013-10-30 10:44:53 -0400 | [diff] [blame] | 1432 | if (ret < 0) { |
| 1433 | goto exit; |
| 1434 | } |
| 1435 | |
| 1436 | exit: |
| 1437 | g_free(hdr); |
| 1438 | return ret; |
| 1439 | } |
| 1440 | |
Jeff Cody | e91a8b2 | 2014-09-16 15:12:06 -0400 | [diff] [blame] | 1441 | #define VHDX_METADATA_ENTRY_BUFFER_SIZE \ |
| 1442 | (sizeof(VHDXFileParameters) +\ |
| 1443 | sizeof(VHDXVirtualDiskSize) +\ |
| 1444 | sizeof(VHDXPage83Data) +\ |
| 1445 | sizeof(VHDXVirtualDiskLogicalSectorSize) +\ |
| 1446 | sizeof(VHDXVirtualDiskPhysicalSectorSize)) |
Jeff Cody | 3412f7b | 2013-10-30 10:44:53 -0400 | [diff] [blame] | 1447 | |
| 1448 | /* |
| 1449 | * Create the Metadata entries. |
| 1450 | * |
| 1451 | * For more details on the entries, see section 3.5 (pg 29) in the |
| 1452 | * VHDX 1.00 specification. |
| 1453 | * |
| 1454 | * We support 5 metadata entries (all required by spec): |
| 1455 | * File Parameters, |
| 1456 | * Virtual Disk Size, |
| 1457 | * Page 83 Data, |
| 1458 | * Logical Sector Size, |
| 1459 | * Physical Sector Size |
| 1460 | * |
| 1461 | * The first 64KB of the Metadata section is reserved for the metadata |
| 1462 | * header and entries; beyond that, the metadata items themselves reside. |
| 1463 | */ |
Kevin Wolf | db1e80e | 2016-06-20 22:05:39 +0200 | [diff] [blame] | 1464 | static int vhdx_create_new_metadata(BlockBackend *blk, |
Jeff Cody | 3412f7b | 2013-10-30 10:44:53 -0400 | [diff] [blame] | 1465 | uint64_t image_size, |
| 1466 | uint32_t block_size, |
| 1467 | uint32_t sector_size, |
| 1468 | uint64_t metadata_offset, |
| 1469 | VHDXImageType type) |
| 1470 | { |
| 1471 | int ret = 0; |
| 1472 | uint32_t offset = 0; |
| 1473 | void *buffer = NULL; |
| 1474 | void *entry_buffer; |
Daniel P. Berrange | a8f15a2 | 2015-08-26 12:17:12 +0100 | [diff] [blame] | 1475 | VHDXMetadataTableHeader *md_table; |
Jeff Cody | 3412f7b | 2013-10-30 10:44:53 -0400 | [diff] [blame] | 1476 | VHDXMetadataTableEntry *md_table_entry; |
| 1477 | |
| 1478 | /* Metadata entries */ |
| 1479 | VHDXFileParameters *mt_file_params; |
| 1480 | VHDXVirtualDiskSize *mt_virtual_size; |
| 1481 | VHDXPage83Data *mt_page83; |
| 1482 | VHDXVirtualDiskLogicalSectorSize *mt_log_sector_size; |
| 1483 | VHDXVirtualDiskPhysicalSectorSize *mt_phys_sector_size; |
| 1484 | |
Jeff Cody | e91a8b2 | 2014-09-16 15:12:06 -0400 | [diff] [blame] | 1485 | entry_buffer = g_malloc0(VHDX_METADATA_ENTRY_BUFFER_SIZE); |
Jeff Cody | 3412f7b | 2013-10-30 10:44:53 -0400 | [diff] [blame] | 1486 | |
| 1487 | mt_file_params = entry_buffer; |
| 1488 | offset += sizeof(VHDXFileParameters); |
| 1489 | mt_virtual_size = entry_buffer + offset; |
| 1490 | offset += sizeof(VHDXVirtualDiskSize); |
| 1491 | mt_page83 = entry_buffer + offset; |
| 1492 | offset += sizeof(VHDXPage83Data); |
| 1493 | mt_log_sector_size = entry_buffer + offset; |
| 1494 | offset += sizeof(VHDXVirtualDiskLogicalSectorSize); |
| 1495 | mt_phys_sector_size = entry_buffer + offset; |
| 1496 | |
| 1497 | mt_file_params->block_size = cpu_to_le32(block_size); |
| 1498 | if (type == VHDX_TYPE_FIXED) { |
| 1499 | mt_file_params->data_bits |= VHDX_PARAMS_LEAVE_BLOCKS_ALLOCED; |
| 1500 | cpu_to_le32s(&mt_file_params->data_bits); |
| 1501 | } |
| 1502 | |
| 1503 | vhdx_guid_generate(&mt_page83->page_83_data); |
| 1504 | cpu_to_leguids(&mt_page83->page_83_data); |
| 1505 | mt_virtual_size->virtual_disk_size = cpu_to_le64(image_size); |
| 1506 | mt_log_sector_size->logical_sector_size = cpu_to_le32(sector_size); |
| 1507 | mt_phys_sector_size->physical_sector_size = cpu_to_le32(sector_size); |
| 1508 | |
| 1509 | buffer = g_malloc0(VHDX_HEADER_BLOCK_SIZE); |
| 1510 | md_table = buffer; |
| 1511 | |
| 1512 | md_table->signature = VHDX_METADATA_SIGNATURE; |
| 1513 | md_table->entry_count = 5; |
| 1514 | vhdx_metadata_header_le_export(md_table); |
| 1515 | |
| 1516 | |
| 1517 | /* This will reference beyond the reserved table portion */ |
| 1518 | offset = 64 * KiB; |
| 1519 | |
| 1520 | md_table_entry = buffer + sizeof(VHDXMetadataTableHeader); |
| 1521 | |
| 1522 | md_table_entry[0].item_id = file_param_guid; |
| 1523 | md_table_entry[0].offset = offset; |
| 1524 | md_table_entry[0].length = sizeof(VHDXFileParameters); |
| 1525 | md_table_entry[0].data_bits |= VHDX_META_FLAGS_IS_REQUIRED; |
| 1526 | offset += md_table_entry[0].length; |
| 1527 | vhdx_metadata_entry_le_export(&md_table_entry[0]); |
| 1528 | |
| 1529 | md_table_entry[1].item_id = virtual_size_guid; |
| 1530 | md_table_entry[1].offset = offset; |
| 1531 | md_table_entry[1].length = sizeof(VHDXVirtualDiskSize); |
| 1532 | md_table_entry[1].data_bits |= VHDX_META_FLAGS_IS_REQUIRED | |
| 1533 | VHDX_META_FLAGS_IS_VIRTUAL_DISK; |
| 1534 | offset += md_table_entry[1].length; |
| 1535 | vhdx_metadata_entry_le_export(&md_table_entry[1]); |
| 1536 | |
| 1537 | md_table_entry[2].item_id = page83_guid; |
| 1538 | md_table_entry[2].offset = offset; |
| 1539 | md_table_entry[2].length = sizeof(VHDXPage83Data); |
| 1540 | md_table_entry[2].data_bits |= VHDX_META_FLAGS_IS_REQUIRED | |
| 1541 | VHDX_META_FLAGS_IS_VIRTUAL_DISK; |
| 1542 | offset += md_table_entry[2].length; |
| 1543 | vhdx_metadata_entry_le_export(&md_table_entry[2]); |
| 1544 | |
| 1545 | md_table_entry[3].item_id = logical_sector_guid; |
| 1546 | md_table_entry[3].offset = offset; |
| 1547 | md_table_entry[3].length = sizeof(VHDXVirtualDiskLogicalSectorSize); |
| 1548 | md_table_entry[3].data_bits |= VHDX_META_FLAGS_IS_REQUIRED | |
| 1549 | VHDX_META_FLAGS_IS_VIRTUAL_DISK; |
| 1550 | offset += md_table_entry[3].length; |
| 1551 | vhdx_metadata_entry_le_export(&md_table_entry[3]); |
| 1552 | |
| 1553 | md_table_entry[4].item_id = phys_sector_guid; |
| 1554 | md_table_entry[4].offset = offset; |
| 1555 | md_table_entry[4].length = sizeof(VHDXVirtualDiskPhysicalSectorSize); |
| 1556 | md_table_entry[4].data_bits |= VHDX_META_FLAGS_IS_REQUIRED | |
| 1557 | VHDX_META_FLAGS_IS_VIRTUAL_DISK; |
| 1558 | vhdx_metadata_entry_le_export(&md_table_entry[4]); |
| 1559 | |
Kevin Wolf | db1e80e | 2016-06-20 22:05:39 +0200 | [diff] [blame] | 1560 | ret = blk_pwrite(blk, metadata_offset, buffer, VHDX_HEADER_BLOCK_SIZE, 0); |
Jeff Cody | 3412f7b | 2013-10-30 10:44:53 -0400 | [diff] [blame] | 1561 | if (ret < 0) { |
| 1562 | goto exit; |
| 1563 | } |
| 1564 | |
Kevin Wolf | db1e80e | 2016-06-20 22:05:39 +0200 | [diff] [blame] | 1565 | ret = blk_pwrite(blk, metadata_offset + (64 * KiB), entry_buffer, |
| 1566 | VHDX_METADATA_ENTRY_BUFFER_SIZE, 0); |
Jeff Cody | 3412f7b | 2013-10-30 10:44:53 -0400 | [diff] [blame] | 1567 | if (ret < 0) { |
| 1568 | goto exit; |
| 1569 | } |
| 1570 | |
| 1571 | |
| 1572 | exit: |
| 1573 | g_free(buffer); |
| 1574 | g_free(entry_buffer); |
| 1575 | return ret; |
| 1576 | } |
| 1577 | |
| 1578 | /* This create the actual BAT itself. We currently only support |
| 1579 | * 'Dynamic' and 'Fixed' image types. |
| 1580 | * |
| 1581 | * Dynamic images: default state of the BAT is all zeroes. |
| 1582 | * |
| 1583 | * Fixed images: default state of the BAT is fully populated, with |
| 1584 | * file offsets and state PAYLOAD_BLOCK_FULLY_PRESENT. |
| 1585 | */ |
Kevin Wolf | db1e80e | 2016-06-20 22:05:39 +0200 | [diff] [blame] | 1586 | static int vhdx_create_bat(BlockBackend *blk, BDRVVHDXState *s, |
Jeff Cody | 3412f7b | 2013-10-30 10:44:53 -0400 | [diff] [blame] | 1587 | uint64_t image_size, VHDXImageType type, |
Jeff Cody | 4f75b52 | 2014-08-06 15:54:58 -0400 | [diff] [blame] | 1588 | bool use_zero_blocks, uint64_t file_offset, |
| 1589 | uint32_t length) |
Jeff Cody | 3412f7b | 2013-10-30 10:44:53 -0400 | [diff] [blame] | 1590 | { |
| 1591 | int ret = 0; |
| 1592 | uint64_t data_file_offset; |
| 1593 | uint64_t total_sectors = 0; |
| 1594 | uint64_t sector_num = 0; |
| 1595 | uint64_t unused; |
| 1596 | int block_state; |
| 1597 | VHDXSectorInfo sinfo; |
| 1598 | |
| 1599 | assert(s->bat == NULL); |
| 1600 | |
| 1601 | /* this gives a data start after BAT/bitmap entries, and well |
| 1602 | * past any metadata entries (with a 4 MB buffer for future |
| 1603 | * expansion */ |
Jeff Cody | 4f75b52 | 2014-08-06 15:54:58 -0400 | [diff] [blame] | 1604 | data_file_offset = file_offset + length + 5 * MiB; |
Jeff Cody | 3412f7b | 2013-10-30 10:44:53 -0400 | [diff] [blame] | 1605 | total_sectors = image_size >> s->logical_sector_size_bits; |
| 1606 | |
| 1607 | if (type == VHDX_TYPE_DYNAMIC) { |
| 1608 | /* All zeroes, so we can just extend the file - the end of the BAT |
| 1609 | * is the furthest thing we have written yet */ |
Kevin Wolf | db1e80e | 2016-06-20 22:05:39 +0200 | [diff] [blame] | 1610 | ret = blk_truncate(blk, data_file_offset); |
Jeff Cody | 3412f7b | 2013-10-30 10:44:53 -0400 | [diff] [blame] | 1611 | if (ret < 0) { |
| 1612 | goto exit; |
| 1613 | } |
| 1614 | } else if (type == VHDX_TYPE_FIXED) { |
Kevin Wolf | db1e80e | 2016-06-20 22:05:39 +0200 | [diff] [blame] | 1615 | ret = blk_truncate(blk, data_file_offset + image_size); |
Jeff Cody | 3412f7b | 2013-10-30 10:44:53 -0400 | [diff] [blame] | 1616 | if (ret < 0) { |
| 1617 | goto exit; |
| 1618 | } |
| 1619 | } else { |
| 1620 | ret = -ENOTSUP; |
| 1621 | goto exit; |
| 1622 | } |
| 1623 | |
| 1624 | if (type == VHDX_TYPE_FIXED || |
| 1625 | use_zero_blocks || |
Kevin Wolf | db1e80e | 2016-06-20 22:05:39 +0200 | [diff] [blame] | 1626 | bdrv_has_zero_init(blk_bs(blk)) == 0) { |
Jeff Cody | 3412f7b | 2013-10-30 10:44:53 -0400 | [diff] [blame] | 1627 | /* for a fixed file, the default BAT entry is not zero */ |
Kevin Wolf | a67e128 | 2014-05-20 13:55:50 +0200 | [diff] [blame] | 1628 | s->bat = g_try_malloc0(length); |
Adelina Tuvenie | a011898 | 2014-09-18 18:17:44 +0300 | [diff] [blame] | 1629 | if (length && s->bat == NULL) { |
Kevin Wolf | a67e128 | 2014-05-20 13:55:50 +0200 | [diff] [blame] | 1630 | ret = -ENOMEM; |
| 1631 | goto exit; |
| 1632 | } |
Jeff Cody | 3412f7b | 2013-10-30 10:44:53 -0400 | [diff] [blame] | 1633 | block_state = type == VHDX_TYPE_FIXED ? PAYLOAD_BLOCK_FULLY_PRESENT : |
| 1634 | PAYLOAD_BLOCK_NOT_PRESENT; |
| 1635 | block_state = use_zero_blocks ? PAYLOAD_BLOCK_ZERO : block_state; |
| 1636 | /* fill the BAT by emulating sector writes of sectors_per_block size */ |
| 1637 | while (sector_num < total_sectors) { |
| 1638 | vhdx_block_translate(s, sector_num, s->sectors_per_block, &sinfo); |
| 1639 | sinfo.file_offset = data_file_offset + |
| 1640 | (sector_num << s->logical_sector_size_bits); |
| 1641 | sinfo.file_offset = ROUND_UP(sinfo.file_offset, MiB); |
Kevin Wolf | db1e80e | 2016-06-20 22:05:39 +0200 | [diff] [blame] | 1642 | vhdx_update_bat_table_entry(blk_bs(blk), s, &sinfo, &unused, &unused, |
Jeff Cody | 3412f7b | 2013-10-30 10:44:53 -0400 | [diff] [blame] | 1643 | block_state); |
| 1644 | cpu_to_le64s(&s->bat[sinfo.bat_idx]); |
| 1645 | sector_num += s->sectors_per_block; |
| 1646 | } |
Kevin Wolf | db1e80e | 2016-06-20 22:05:39 +0200 | [diff] [blame] | 1647 | ret = blk_pwrite(blk, file_offset, s->bat, length, 0); |
Jeff Cody | 3412f7b | 2013-10-30 10:44:53 -0400 | [diff] [blame] | 1648 | if (ret < 0) { |
| 1649 | goto exit; |
| 1650 | } |
| 1651 | } |
| 1652 | |
| 1653 | |
| 1654 | |
| 1655 | exit: |
| 1656 | g_free(s->bat); |
| 1657 | return ret; |
| 1658 | } |
| 1659 | |
| 1660 | /* Creates the region table header, and region table entries. |
| 1661 | * There are 2 supported region table entries: BAT, and Metadata/ |
| 1662 | * |
| 1663 | * As the calculations for the BAT region table are also needed |
| 1664 | * to create the BAT itself, we will also cause the BAT to be |
| 1665 | * created. |
| 1666 | */ |
Kevin Wolf | db1e80e | 2016-06-20 22:05:39 +0200 | [diff] [blame] | 1667 | static int vhdx_create_new_region_table(BlockBackend *blk, |
Jeff Cody | 3412f7b | 2013-10-30 10:44:53 -0400 | [diff] [blame] | 1668 | uint64_t image_size, |
| 1669 | uint32_t block_size, |
| 1670 | uint32_t sector_size, |
| 1671 | uint32_t log_size, |
| 1672 | bool use_zero_blocks, |
| 1673 | VHDXImageType type, |
| 1674 | uint64_t *metadata_offset) |
| 1675 | { |
| 1676 | int ret = 0; |
| 1677 | uint32_t offset = 0; |
| 1678 | void *buffer = NULL; |
Jeff Cody | 4f75b52 | 2014-08-06 15:54:58 -0400 | [diff] [blame] | 1679 | uint64_t bat_file_offset; |
| 1680 | uint32_t bat_length; |
Jeff Cody | 3412f7b | 2013-10-30 10:44:53 -0400 | [diff] [blame] | 1681 | BDRVVHDXState *s = NULL; |
| 1682 | VHDXRegionTableHeader *region_table; |
| 1683 | VHDXRegionTableEntry *rt_bat; |
| 1684 | VHDXRegionTableEntry *rt_metadata; |
| 1685 | |
| 1686 | assert(metadata_offset != NULL); |
| 1687 | |
| 1688 | /* Populate enough of the BDRVVHDXState to be able to use the |
| 1689 | * pre-existing BAT calculation, translation, and update functions */ |
Markus Armbruster | 5839e53 | 2014-08-19 10:31:08 +0200 | [diff] [blame] | 1690 | s = g_new0(BDRVVHDXState, 1); |
Jeff Cody | 3412f7b | 2013-10-30 10:44:53 -0400 | [diff] [blame] | 1691 | |
| 1692 | s->chunk_ratio = (VHDX_MAX_SECTORS_PER_BLOCK) * |
| 1693 | (uint64_t) sector_size / (uint64_t) block_size; |
| 1694 | |
| 1695 | s->sectors_per_block = block_size / sector_size; |
| 1696 | s->virtual_disk_size = image_size; |
| 1697 | s->block_size = block_size; |
| 1698 | s->logical_sector_size = sector_size; |
| 1699 | |
| 1700 | vhdx_set_shift_bits(s); |
| 1701 | |
| 1702 | vhdx_calc_bat_entries(s); |
| 1703 | |
| 1704 | /* At this point the VHDX state is populated enough for creation */ |
| 1705 | |
| 1706 | /* a single buffer is used so we can calculate the checksum over the |
| 1707 | * entire 64KB block */ |
| 1708 | buffer = g_malloc0(VHDX_HEADER_BLOCK_SIZE); |
| 1709 | region_table = buffer; |
| 1710 | offset += sizeof(VHDXRegionTableHeader); |
| 1711 | rt_bat = buffer + offset; |
| 1712 | offset += sizeof(VHDXRegionTableEntry); |
| 1713 | rt_metadata = buffer + offset; |
| 1714 | |
| 1715 | region_table->signature = VHDX_REGION_SIGNATURE; |
| 1716 | region_table->entry_count = 2; /* BAT and Metadata */ |
| 1717 | |
| 1718 | rt_bat->guid = bat_guid; |
| 1719 | rt_bat->length = ROUND_UP(s->bat_entries * sizeof(VHDXBatEntry), MiB); |
| 1720 | rt_bat->file_offset = ROUND_UP(VHDX_HEADER_SECTION_END + log_size, MiB); |
| 1721 | s->bat_offset = rt_bat->file_offset; |
| 1722 | |
| 1723 | rt_metadata->guid = metadata_guid; |
| 1724 | rt_metadata->file_offset = ROUND_UP(rt_bat->file_offset + rt_bat->length, |
| 1725 | MiB); |
| 1726 | rt_metadata->length = 1 * MiB; /* min size, and more than enough */ |
| 1727 | *metadata_offset = rt_metadata->file_offset; |
| 1728 | |
Jeff Cody | 4f75b52 | 2014-08-06 15:54:58 -0400 | [diff] [blame] | 1729 | bat_file_offset = rt_bat->file_offset; |
| 1730 | bat_length = rt_bat->length; |
| 1731 | |
| 1732 | vhdx_region_header_le_export(region_table); |
| 1733 | vhdx_region_entry_le_export(rt_bat); |
| 1734 | vhdx_region_entry_le_export(rt_metadata); |
| 1735 | |
Jeff Cody | 3412f7b | 2013-10-30 10:44:53 -0400 | [diff] [blame] | 1736 | vhdx_update_checksum(buffer, VHDX_HEADER_BLOCK_SIZE, |
| 1737 | offsetof(VHDXRegionTableHeader, checksum)); |
| 1738 | |
| 1739 | |
| 1740 | /* The region table gives us the data we need to create the BAT, |
| 1741 | * so do that now */ |
Kevin Wolf | db1e80e | 2016-06-20 22:05:39 +0200 | [diff] [blame] | 1742 | ret = vhdx_create_bat(blk, s, image_size, type, use_zero_blocks, |
Jeff Cody | 4f75b52 | 2014-08-06 15:54:58 -0400 | [diff] [blame] | 1743 | bat_file_offset, bat_length); |
| 1744 | if (ret < 0) { |
| 1745 | goto exit; |
| 1746 | } |
Jeff Cody | 3412f7b | 2013-10-30 10:44:53 -0400 | [diff] [blame] | 1747 | |
| 1748 | /* Now write out the region headers to disk */ |
Kevin Wolf | db1e80e | 2016-06-20 22:05:39 +0200 | [diff] [blame] | 1749 | ret = blk_pwrite(blk, VHDX_REGION_TABLE_OFFSET, buffer, |
| 1750 | VHDX_HEADER_BLOCK_SIZE, 0); |
Jeff Cody | 3412f7b | 2013-10-30 10:44:53 -0400 | [diff] [blame] | 1751 | if (ret < 0) { |
| 1752 | goto exit; |
| 1753 | } |
| 1754 | |
Kevin Wolf | db1e80e | 2016-06-20 22:05:39 +0200 | [diff] [blame] | 1755 | ret = blk_pwrite(blk, VHDX_REGION_TABLE2_OFFSET, buffer, |
| 1756 | VHDX_HEADER_BLOCK_SIZE, 0); |
Jeff Cody | 3412f7b | 2013-10-30 10:44:53 -0400 | [diff] [blame] | 1757 | if (ret < 0) { |
| 1758 | goto exit; |
| 1759 | } |
| 1760 | |
Jeff Cody | 3412f7b | 2013-10-30 10:44:53 -0400 | [diff] [blame] | 1761 | exit: |
| 1762 | g_free(s); |
| 1763 | g_free(buffer); |
| 1764 | return ret; |
| 1765 | } |
| 1766 | |
| 1767 | /* We need to create the following elements: |
| 1768 | * |
| 1769 | * .-----------------------------------------------------------------. |
| 1770 | * | (A) | (B) | (C) | (D) | (E) | |
| 1771 | * | File ID | Header1 | Header 2 | Region Tbl 1 | Region Tbl 2 | |
| 1772 | * | | | | | | |
| 1773 | * .-----------------------------------------------------------------. |
| 1774 | * 0 64KB 128KB 192KB 256KB 320KB |
| 1775 | * |
| 1776 | * |
| 1777 | * .---- ~ ----------- ~ ------------ ~ ---------------- ~ -----------. |
| 1778 | * | (F) | (G) | (H) | | |
| 1779 | * | Journal Log | BAT / Bitmap | Metadata | .... data ...... | |
| 1780 | * | | | | | |
| 1781 | * .---- ~ ----------- ~ ------------ ~ ---------------- ~ -----------. |
| 1782 | * 1MB |
| 1783 | */ |
Chunyan Liu | 5366092 | 2014-06-05 17:21:08 +0800 | [diff] [blame] | 1784 | static int vhdx_create(const char *filename, QemuOpts *opts, Error **errp) |
Jeff Cody | 3412f7b | 2013-10-30 10:44:53 -0400 | [diff] [blame] | 1785 | { |
| 1786 | int ret = 0; |
| 1787 | uint64_t image_size = (uint64_t) 2 * GiB; |
| 1788 | uint32_t log_size = 1 * MiB; |
| 1789 | uint32_t block_size = 0; |
| 1790 | uint64_t signature; |
| 1791 | uint64_t metadata_offset; |
| 1792 | bool use_zero_blocks = false; |
| 1793 | |
| 1794 | gunichar2 *creator = NULL; |
| 1795 | glong creator_items; |
Kevin Wolf | 10bf03a | 2016-03-08 15:57:05 +0100 | [diff] [blame] | 1796 | BlockBackend *blk; |
Chunyan Liu | 5366092 | 2014-06-05 17:21:08 +0800 | [diff] [blame] | 1797 | char *type = NULL; |
Jeff Cody | 3412f7b | 2013-10-30 10:44:53 -0400 | [diff] [blame] | 1798 | VHDXImageType image_type; |
| 1799 | Error *local_err = NULL; |
| 1800 | |
Hu Tao | c2eb918 | 2014-09-10 17:05:45 +0800 | [diff] [blame] | 1801 | image_size = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0), |
| 1802 | BDRV_SECTOR_SIZE); |
Chunyan Liu | 5366092 | 2014-06-05 17:21:08 +0800 | [diff] [blame] | 1803 | log_size = qemu_opt_get_size_del(opts, VHDX_BLOCK_OPT_LOG_SIZE, 0); |
| 1804 | block_size = qemu_opt_get_size_del(opts, VHDX_BLOCK_OPT_BLOCK_SIZE, 0); |
| 1805 | type = qemu_opt_get_del(opts, BLOCK_OPT_SUBFMT); |
Jeff Cody | 30af51c | 2014-12-08 01:07:44 -0500 | [diff] [blame] | 1806 | use_zero_blocks = qemu_opt_get_bool_del(opts, VHDX_BLOCK_OPT_ZERO, true); |
Jeff Cody | 3412f7b | 2013-10-30 10:44:53 -0400 | [diff] [blame] | 1807 | |
| 1808 | if (image_size > VHDX_MAX_IMAGE_SIZE) { |
| 1809 | error_setg_errno(errp, EINVAL, "Image size too large; max of 64TB"); |
| 1810 | ret = -EINVAL; |
| 1811 | goto exit; |
| 1812 | } |
| 1813 | |
| 1814 | if (type == NULL) { |
Chunyan Liu | 5366092 | 2014-06-05 17:21:08 +0800 | [diff] [blame] | 1815 | type = g_strdup("dynamic"); |
Jeff Cody | 3412f7b | 2013-10-30 10:44:53 -0400 | [diff] [blame] | 1816 | } |
| 1817 | |
| 1818 | if (!strcmp(type, "dynamic")) { |
| 1819 | image_type = VHDX_TYPE_DYNAMIC; |
| 1820 | } else if (!strcmp(type, "fixed")) { |
| 1821 | image_type = VHDX_TYPE_FIXED; |
| 1822 | } else if (!strcmp(type, "differencing")) { |
| 1823 | error_setg_errno(errp, ENOTSUP, |
| 1824 | "Differencing files not yet supported"); |
| 1825 | ret = -ENOTSUP; |
| 1826 | goto exit; |
| 1827 | } else { |
| 1828 | ret = -EINVAL; |
| 1829 | goto exit; |
| 1830 | } |
| 1831 | |
| 1832 | /* These are pretty arbitrary, and mainly designed to keep the BAT |
| 1833 | * size reasonable to load into RAM */ |
| 1834 | if (block_size == 0) { |
| 1835 | if (image_size > 32 * TiB) { |
| 1836 | block_size = 64 * MiB; |
| 1837 | } else if (image_size > (uint64_t) 100 * GiB) { |
| 1838 | block_size = 32 * MiB; |
| 1839 | } else if (image_size > 1 * GiB) { |
| 1840 | block_size = 16 * MiB; |
| 1841 | } else { |
| 1842 | block_size = 8 * MiB; |
| 1843 | } |
| 1844 | } |
| 1845 | |
| 1846 | |
| 1847 | /* make the log size close to what was specified, but must be |
| 1848 | * min 1MB, and multiple of 1MB */ |
| 1849 | log_size = ROUND_UP(log_size, MiB); |
| 1850 | |
| 1851 | block_size = ROUND_UP(block_size, MiB); |
| 1852 | block_size = block_size > VHDX_BLOCK_SIZE_MAX ? VHDX_BLOCK_SIZE_MAX : |
| 1853 | block_size; |
| 1854 | |
Chunyan Liu | c282e1f | 2014-06-05 17:21:11 +0800 | [diff] [blame] | 1855 | ret = bdrv_create_file(filename, opts, &local_err); |
Jeff Cody | 3412f7b | 2013-10-30 10:44:53 -0400 | [diff] [blame] | 1856 | if (ret < 0) { |
| 1857 | error_propagate(errp, local_err); |
| 1858 | goto exit; |
| 1859 | } |
| 1860 | |
Max Reitz | efaa7c4 | 2016-03-16 19:54:38 +0100 | [diff] [blame] | 1861 | blk = blk_new_open(filename, NULL, NULL, |
Kevin Wolf | 5588060 | 2017-02-17 15:07:38 +0100 | [diff] [blame] | 1862 | BDRV_O_RDWR | BDRV_O_RESIZE | BDRV_O_PROTOCOL, |
| 1863 | &local_err); |
Kevin Wolf | 10bf03a | 2016-03-08 15:57:05 +0100 | [diff] [blame] | 1864 | if (blk == NULL) { |
Jeff Cody | 3412f7b | 2013-10-30 10:44:53 -0400 | [diff] [blame] | 1865 | error_propagate(errp, local_err); |
Kevin Wolf | 10bf03a | 2016-03-08 15:57:05 +0100 | [diff] [blame] | 1866 | ret = -EIO; |
Jeff Cody | 3412f7b | 2013-10-30 10:44:53 -0400 | [diff] [blame] | 1867 | goto exit; |
| 1868 | } |
| 1869 | |
Kevin Wolf | 10bf03a | 2016-03-08 15:57:05 +0100 | [diff] [blame] | 1870 | blk_set_allow_write_beyond_eof(blk, true); |
| 1871 | |
Jeff Cody | 3412f7b | 2013-10-30 10:44:53 -0400 | [diff] [blame] | 1872 | /* Create (A) */ |
| 1873 | |
| 1874 | /* The creator field is optional, but may be useful for |
| 1875 | * debugging / diagnostics */ |
| 1876 | creator = g_utf8_to_utf16("QEMU v" QEMU_VERSION, -1, NULL, |
| 1877 | &creator_items, NULL); |
| 1878 | signature = cpu_to_le64(VHDX_FILE_SIGNATURE); |
Eric Blake | 8341f00 | 2016-05-06 10:26:27 -0600 | [diff] [blame] | 1879 | ret = blk_pwrite(blk, VHDX_FILE_ID_OFFSET, &signature, sizeof(signature), |
| 1880 | 0); |
Jeff Cody | 3412f7b | 2013-10-30 10:44:53 -0400 | [diff] [blame] | 1881 | if (ret < 0) { |
| 1882 | goto delete_and_exit; |
| 1883 | } |
| 1884 | if (creator) { |
Kevin Wolf | 10bf03a | 2016-03-08 15:57:05 +0100 | [diff] [blame] | 1885 | ret = blk_pwrite(blk, VHDX_FILE_ID_OFFSET + sizeof(signature), |
Eric Blake | 8341f00 | 2016-05-06 10:26:27 -0600 | [diff] [blame] | 1886 | creator, creator_items * sizeof(gunichar2), 0); |
Jeff Cody | 3412f7b | 2013-10-30 10:44:53 -0400 | [diff] [blame] | 1887 | if (ret < 0) { |
| 1888 | goto delete_and_exit; |
| 1889 | } |
| 1890 | } |
| 1891 | |
| 1892 | |
| 1893 | /* Creates (B),(C) */ |
Kevin Wolf | db1e80e | 2016-06-20 22:05:39 +0200 | [diff] [blame] | 1894 | ret = vhdx_create_new_headers(blk, image_size, log_size); |
Jeff Cody | 3412f7b | 2013-10-30 10:44:53 -0400 | [diff] [blame] | 1895 | if (ret < 0) { |
| 1896 | goto delete_and_exit; |
| 1897 | } |
| 1898 | |
| 1899 | /* Creates (D),(E),(G) explicitly. (F) created as by-product */ |
Kevin Wolf | db1e80e | 2016-06-20 22:05:39 +0200 | [diff] [blame] | 1900 | ret = vhdx_create_new_region_table(blk, image_size, block_size, 512, |
Jeff Cody | 3412f7b | 2013-10-30 10:44:53 -0400 | [diff] [blame] | 1901 | log_size, use_zero_blocks, image_type, |
| 1902 | &metadata_offset); |
| 1903 | if (ret < 0) { |
| 1904 | goto delete_and_exit; |
| 1905 | } |
| 1906 | |
| 1907 | /* Creates (H) */ |
Kevin Wolf | db1e80e | 2016-06-20 22:05:39 +0200 | [diff] [blame] | 1908 | ret = vhdx_create_new_metadata(blk, image_size, block_size, 512, |
Jeff Cody | 3412f7b | 2013-10-30 10:44:53 -0400 | [diff] [blame] | 1909 | metadata_offset, image_type); |
| 1910 | if (ret < 0) { |
| 1911 | goto delete_and_exit; |
| 1912 | } |
| 1913 | |
| 1914 | |
Jeff Cody | 3412f7b | 2013-10-30 10:44:53 -0400 | [diff] [blame] | 1915 | delete_and_exit: |
Kevin Wolf | 10bf03a | 2016-03-08 15:57:05 +0100 | [diff] [blame] | 1916 | blk_unref(blk); |
Jeff Cody | 3412f7b | 2013-10-30 10:44:53 -0400 | [diff] [blame] | 1917 | exit: |
Chunyan Liu | 5366092 | 2014-06-05 17:21:08 +0800 | [diff] [blame] | 1918 | g_free(type); |
Jeff Cody | 3412f7b | 2013-10-30 10:44:53 -0400 | [diff] [blame] | 1919 | g_free(creator); |
| 1920 | return ret; |
| 1921 | } |
| 1922 | |
Jeff Cody | 7e30e6a | 2013-12-17 05:33:37 -0500 | [diff] [blame] | 1923 | /* If opened r/w, the VHDX driver will automatically replay the log, |
| 1924 | * if one is present, inside the vhdx_open() call. |
| 1925 | * |
| 1926 | * If qemu-img check -r all is called, the image is automatically opened |
| 1927 | * r/w and any log has already been replayed, so there is nothing (currently) |
| 1928 | * for us to do here |
| 1929 | */ |
| 1930 | static int vhdx_check(BlockDriverState *bs, BdrvCheckResult *result, |
| 1931 | BdrvCheckMode fix) |
| 1932 | { |
| 1933 | BDRVVHDXState *s = bs->opaque; |
| 1934 | |
| 1935 | if (s->log_replayed_on_open) { |
| 1936 | result->corruptions_fixed++; |
| 1937 | } |
| 1938 | return 0; |
| 1939 | } |
| 1940 | |
Chunyan Liu | 5366092 | 2014-06-05 17:21:08 +0800 | [diff] [blame] | 1941 | static QemuOptsList vhdx_create_opts = { |
| 1942 | .name = "vhdx-create-opts", |
| 1943 | .head = QTAILQ_HEAD_INITIALIZER(vhdx_create_opts.head), |
| 1944 | .desc = { |
| 1945 | { |
| 1946 | .name = BLOCK_OPT_SIZE, |
| 1947 | .type = QEMU_OPT_SIZE, |
| 1948 | .help = "Virtual disk size; max of 64TB." |
| 1949 | }, |
| 1950 | { |
| 1951 | .name = VHDX_BLOCK_OPT_LOG_SIZE, |
| 1952 | .type = QEMU_OPT_SIZE, |
| 1953 | .def_value_str = stringify(DEFAULT_LOG_SIZE), |
| 1954 | .help = "Log size; min 1MB." |
| 1955 | }, |
| 1956 | { |
| 1957 | .name = VHDX_BLOCK_OPT_BLOCK_SIZE, |
| 1958 | .type = QEMU_OPT_SIZE, |
| 1959 | .def_value_str = stringify(0), |
| 1960 | .help = "Block Size; min 1MB, max 256MB. " \ |
| 1961 | "0 means auto-calculate based on image size." |
| 1962 | }, |
| 1963 | { |
| 1964 | .name = BLOCK_OPT_SUBFMT, |
| 1965 | .type = QEMU_OPT_STRING, |
| 1966 | .help = "VHDX format type, can be either 'dynamic' or 'fixed'. "\ |
| 1967 | "Default is 'dynamic'." |
| 1968 | }, |
| 1969 | { |
| 1970 | .name = VHDX_BLOCK_OPT_ZERO, |
| 1971 | .type = QEMU_OPT_BOOL, |
Jeff Cody | 30af51c | 2014-12-08 01:07:44 -0500 | [diff] [blame] | 1972 | .help = "Force use of payload blocks of type 'ZERO'. "\ |
| 1973 | "Non-standard, but default. Do not set to 'off' when "\ |
| 1974 | "using 'qemu-img convert' with subformat=dynamic." |
Chunyan Liu | 5366092 | 2014-06-05 17:21:08 +0800 | [diff] [blame] | 1975 | }, |
| 1976 | { NULL } |
| 1977 | } |
Jeff Cody | 3412f7b | 2013-10-30 10:44:53 -0400 | [diff] [blame] | 1978 | }; |
| 1979 | |
Jeff Cody | e8d4e5f | 2013-04-29 14:48:18 -0400 | [diff] [blame] | 1980 | static BlockDriver bdrv_vhdx = { |
| 1981 | .format_name = "vhdx", |
| 1982 | .instance_size = sizeof(BDRVVHDXState), |
| 1983 | .bdrv_probe = vhdx_probe, |
| 1984 | .bdrv_open = vhdx_open, |
| 1985 | .bdrv_close = vhdx_close, |
| 1986 | .bdrv_reopen_prepare = vhdx_reopen_prepare, |
Kevin Wolf | 862f215 | 2016-12-19 16:36:02 +0100 | [diff] [blame] | 1987 | .bdrv_child_perm = bdrv_format_default_perms, |
Jeff Cody | e8d4e5f | 2013-04-29 14:48:18 -0400 | [diff] [blame] | 1988 | .bdrv_co_readv = vhdx_co_readv, |
| 1989 | .bdrv_co_writev = vhdx_co_writev, |
Chunyan Liu | c282e1f | 2014-06-05 17:21:11 +0800 | [diff] [blame] | 1990 | .bdrv_create = vhdx_create, |
Paolo Bonzini | 97b00e2 | 2013-11-22 13:39:49 +0100 | [diff] [blame] | 1991 | .bdrv_get_info = vhdx_get_info, |
Jeff Cody | 7e30e6a | 2013-12-17 05:33:37 -0500 | [diff] [blame] | 1992 | .bdrv_check = vhdx_check, |
Jeff Cody | 85b712c | 2014-12-08 01:07:45 -0500 | [diff] [blame] | 1993 | .bdrv_has_zero_init = bdrv_has_zero_init_1, |
Jeff Cody | 3412f7b | 2013-10-30 10:44:53 -0400 | [diff] [blame] | 1994 | |
Chunyan Liu | 5366092 | 2014-06-05 17:21:08 +0800 | [diff] [blame] | 1995 | .create_opts = &vhdx_create_opts, |
Jeff Cody | e8d4e5f | 2013-04-29 14:48:18 -0400 | [diff] [blame] | 1996 | }; |
| 1997 | |
| 1998 | static void bdrv_vhdx_init(void) |
| 1999 | { |
| 2000 | bdrv_register(&bdrv_vhdx); |
| 2001 | } |
| 2002 | |
| 2003 | block_init(bdrv_vhdx_init); |