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Commit | Line | Data |
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6a0f9e82 | 1 | /* |
cc2040f8 | 2 | * Block driver for Connectix / Microsoft Virtual PC images |
5fafdf24 | 3 | * |
6a0f9e82 | 4 | * Copyright (c) 2005 Alex Beregszaszi |
15d35bc5 | 5 | * Copyright (c) 2009 Kevin Wolf <kwolf@suse.de> |
5fafdf24 | 6 | * |
6a0f9e82 FB |
7 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
8 | * of this software and associated documentation files (the "Software"), to deal | |
9 | * in the Software without restriction, including without limitation the rights | |
10 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
11 | * copies of the Software, and to permit persons to whom the Software is | |
12 | * furnished to do so, subject to the following conditions: | |
13 | * | |
14 | * The above copyright notice and this permission notice shall be included in | |
15 | * all copies or substantial portions of the Software. | |
16 | * | |
17 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
18 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
19 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
20 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
21 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
22 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN | |
23 | * THE SOFTWARE. | |
24 | */ | |
922a01a0 | 25 | |
80c71a24 | 26 | #include "qemu/osdep.h" |
da34e65c | 27 | #include "qapi/error.h" |
737e150e | 28 | #include "block/block_int.h" |
609f45ea | 29 | #include "block/qdict.h" |
b8f45cdf | 30 | #include "sysemu/block-backend.h" |
1de7afc9 | 31 | #include "qemu/module.h" |
922a01a0 | 32 | #include "qemu/option.h" |
795c40b8 | 33 | #include "migration/blocker.h" |
58369e22 | 34 | #include "qemu/bswap.h" |
38440a21 | 35 | #include "qemu/uuid.h" |
5df022cf | 36 | #include "qemu/memalign.h" |
182c8835 KW |
37 | #include "qapi/qmp/qdict.h" |
38 | #include "qapi/qobject-input-visitor.h" | |
39 | #include "qapi/qapi-visit-block-core.h" | |
6a0f9e82 FB |
40 | |
41 | /**************************************************************/ | |
42 | ||
6a0f9e82 FB |
43 | //#define CACHE |
44 | ||
2cfacb62 AL |
45 | enum vhd_type { |
46 | VHD_FIXED = 2, | |
47 | VHD_DYNAMIC = 3, | |
48 | VHD_DIFFERENCING = 4, | |
49 | }; | |
50 | ||
9c057d0b | 51 | /* Seconds since Jan 1, 2000 0:00:00 (UTC) */ |
57c7d9e5 AL |
52 | #define VHD_TIMESTAMP_BASE 946684800 |
53 | ||
fb9245c2 JC |
54 | #define VHD_CHS_MAX_C 65535LL |
55 | #define VHD_CHS_MAX_H 16 | |
56 | #define VHD_CHS_MAX_S 255 | |
57 | ||
c23fb11b | 58 | #define VHD_MAX_SECTORS 0xff000000 /* 2040 GiB max image size */ |
fb9245c2 JC |
59 | #define VHD_MAX_GEOMETRY (VHD_CHS_MAX_C * VHD_CHS_MAX_H * VHD_CHS_MAX_S) |
60 | ||
61 | #define VPC_OPT_FORCE_SIZE "force_size" | |
97f1c45c | 62 | |
9c057d0b | 63 | /* always big-endian */ |
e54835c0 | 64 | typedef struct vhd_footer { |
9c057d0b | 65 | char creator[8]; /* "conectix" */ |
2cfacb62 AL |
66 | uint32_t features; |
67 | uint32_t version; | |
68 | ||
9c057d0b | 69 | /* Offset of next header structure, 0xFFFFFFFF if none */ |
2cfacb62 AL |
70 | uint64_t data_offset; |
71 | ||
9c057d0b | 72 | /* Seconds since Jan 1, 2000 0:00:00 (UTC) */ |
2cfacb62 AL |
73 | uint32_t timestamp; |
74 | ||
9c057d0b | 75 | char creator_app[4]; /* e.g., "vpc " */ |
2cfacb62 AL |
76 | uint16_t major; |
77 | uint16_t minor; | |
9c057d0b | 78 | char creator_os[4]; /* "Wi2k" */ |
2cfacb62 AL |
79 | |
80 | uint64_t orig_size; | |
03671ded | 81 | uint64_t current_size; |
2cfacb62 AL |
82 | |
83 | uint16_t cyls; | |
84 | uint8_t heads; | |
85 | uint8_t secs_per_cyl; | |
86 | ||
87 | uint32_t type; | |
88 | ||
9c057d0b JC |
89 | /* Checksum of the Hard Disk Footer ("one's complement of the sum of all |
90 | the bytes in the footer without the checksum field") */ | |
2cfacb62 AL |
91 | uint32_t checksum; |
92 | ||
9c057d0b | 93 | /* UUID used to identify a parent hard disk (backing file) */ |
38440a21 | 94 | QemuUUID uuid; |
2cfacb62 AL |
95 | |
96 | uint8_t in_saved_state; | |
275734e4 | 97 | uint8_t reserved[427]; |
e54835c0 | 98 | } QEMU_PACKED VHDFooter; |
b9fa33a6 | 99 | |
275734e4 MA |
100 | QEMU_BUILD_BUG_ON(sizeof(VHDFooter) != 512); |
101 | ||
e54835c0 | 102 | typedef struct vhd_dyndisk_header { |
9c057d0b | 103 | char magic[8]; /* "cxsparse" */ |
2cfacb62 | 104 | |
9c057d0b | 105 | /* Offset of next header structure, 0xFFFFFFFF if none */ |
2cfacb62 AL |
106 | uint64_t data_offset; |
107 | ||
9c057d0b | 108 | /* Offset of the Block Allocation Table (BAT) */ |
2cfacb62 AL |
109 | uint64_t table_offset; |
110 | ||
111 | uint32_t version; | |
9c057d0b | 112 | uint32_t max_table_entries; /* 32bit/entry */ |
2cfacb62 | 113 | |
9c057d0b | 114 | /* 2 MB by default, must be a power of two */ |
2cfacb62 AL |
115 | uint32_t block_size; |
116 | ||
117 | uint32_t checksum; | |
118 | uint8_t parent_uuid[16]; | |
119 | uint32_t parent_timestamp; | |
120 | uint32_t reserved; | |
121 | ||
9c057d0b | 122 | /* Backing file name (in UTF-16) */ |
2cfacb62 AL |
123 | uint8_t parent_name[512]; |
124 | ||
125 | struct { | |
126 | uint32_t platform; | |
127 | uint32_t data_space; | |
128 | uint32_t data_length; | |
129 | uint32_t reserved; | |
130 | uint64_t data_offset; | |
131 | } parent_locator[8]; | |
e326f078 | 132 | uint8_t reserved2[256]; |
e54835c0 | 133 | } QEMU_PACKED VHDDynDiskHeader; |
6a0f9e82 | 134 | |
e326f078 MA |
135 | QEMU_BUILD_BUG_ON(sizeof(VHDDynDiskHeader) != 1024); |
136 | ||
6a0f9e82 | 137 | typedef struct BDRVVPCState { |
848c66e8 | 138 | CoMutex lock; |
275734e4 | 139 | VHDFooter footer; |
15d35bc5 | 140 | uint64_t free_data_block_offset; |
2cfacb62 | 141 | int max_table_entries; |
6a0f9e82 | 142 | uint32_t *pagetable; |
15d35bc5 AL |
143 | uint64_t bat_offset; |
144 | uint64_t last_bitmap_offset; | |
6a0f9e82 | 145 | |
2cfacb62 | 146 | uint32_t block_size; |
15d35bc5 | 147 | uint32_t bitmap_size; |
c540d53a JC |
148 | bool force_use_chs; |
149 | bool force_use_sz; | |
15d35bc5 | 150 | |
6a0f9e82 FB |
151 | #ifdef CACHE |
152 | uint8_t *pageentry_u8; | |
153 | uint32_t *pageentry_u32; | |
154 | uint16_t *pageentry_u16; | |
3b46e624 | 155 | |
6a0f9e82 FB |
156 | uint64_t last_bitmap; |
157 | #endif | |
612ff3d8 KW |
158 | |
159 | Error *migration_blocker; | |
6a0f9e82 FB |
160 | } BDRVVPCState; |
161 | ||
c540d53a JC |
162 | #define VPC_OPT_SIZE_CALC "force_size_calc" |
163 | static QemuOptsList vpc_runtime_opts = { | |
164 | .name = "vpc-runtime-opts", | |
165 | .head = QTAILQ_HEAD_INITIALIZER(vpc_runtime_opts.head), | |
166 | .desc = { | |
167 | { | |
168 | .name = VPC_OPT_SIZE_CALC, | |
169 | .type = QEMU_OPT_STRING, | |
170 | .help = "Force disk size calculation to use either CHS geometry, " | |
171 | "or use the disk current_size specified in the VHD footer. " | |
172 | "{chs, current_size}" | |
173 | }, | |
174 | { /* end of list */ } | |
175 | } | |
176 | }; | |
177 | ||
182c8835 KW |
178 | static QemuOptsList vpc_create_opts; |
179 | ||
7550379d | 180 | static uint32_t vpc_checksum(void *p, size_t size) |
57c7d9e5 | 181 | { |
7550379d | 182 | uint8_t *buf = p; |
57c7d9e5 AL |
183 | uint32_t res = 0; |
184 | int i; | |
185 | ||
186 | for (i = 0; i < size; i++) | |
187 | res += buf[i]; | |
188 | ||
189 | return ~res; | |
190 | } | |
191 | ||
192 | ||
6a0f9e82 FB |
193 | static int vpc_probe(const uint8_t *buf, int buf_size, const char *filename) |
194 | { | |
ffe8ab83 | 195 | if (buf_size >= 8 && !strncmp((char *)buf, "conectix", 8)) |
7d37435b | 196 | return 100; |
6a0f9e82 FB |
197 | return 0; |
198 | } | |
199 | ||
c540d53a JC |
200 | static void vpc_parse_options(BlockDriverState *bs, QemuOpts *opts, |
201 | Error **errp) | |
202 | { | |
203 | BDRVVPCState *s = bs->opaque; | |
204 | const char *size_calc; | |
205 | ||
206 | size_calc = qemu_opt_get(opts, VPC_OPT_SIZE_CALC); | |
207 | ||
208 | if (!size_calc) { | |
209 | /* no override, use autodetect only */ | |
210 | } else if (!strcmp(size_calc, "current_size")) { | |
211 | s->force_use_sz = true; | |
212 | } else if (!strcmp(size_calc, "chs")) { | |
213 | s->force_use_chs = true; | |
214 | } else { | |
215 | error_setg(errp, "Invalid size calculation mode: '%s'", size_calc); | |
216 | } | |
217 | } | |
218 | ||
015a1036 HR |
219 | static int vpc_open(BlockDriverState *bs, QDict *options, int flags, |
220 | Error **errp) | |
6a0f9e82 FB |
221 | { |
222 | BDRVVPCState *s = bs->opaque; | |
66f82cee | 223 | int i; |
e54835c0 | 224 | VHDFooter *footer; |
c540d53a JC |
225 | QemuOpts *opts = NULL; |
226 | Error *local_err = NULL; | |
227 | bool use_chs; | |
e326f078 | 228 | VHDDynDiskHeader dyndisk_header; |
57c7d9e5 | 229 | uint32_t checksum; |
97f1c45c | 230 | uint64_t computed_size; |
b15deac7 | 231 | uint64_t pagetable_size; |
24da78db | 232 | int disk_type = VHD_DYNAMIC; |
59294e46 | 233 | int ret; |
81caa3cc | 234 | int64_t bs_size; |
6a0f9e82 | 235 | |
83930780 VSO |
236 | ret = bdrv_open_file_child(NULL, options, "file", bs, errp); |
237 | if (ret < 0) { | |
238 | return ret; | |
4e4bf5c4 KW |
239 | } |
240 | ||
c540d53a | 241 | opts = qemu_opts_create(&vpc_runtime_opts, NULL, 0, &error_abort); |
af175e85 | 242 | if (!qemu_opts_absorb_qdict(opts, options, errp)) { |
c540d53a JC |
243 | ret = -EINVAL; |
244 | goto fail; | |
245 | } | |
246 | ||
247 | vpc_parse_options(bs, opts, &local_err); | |
248 | if (local_err) { | |
249 | error_propagate(errp, local_err); | |
250 | ret = -EINVAL; | |
251 | goto fail; | |
252 | } | |
253 | ||
32cc71de | 254 | ret = bdrv_pread(bs->file, 0, sizeof(s->footer), &s->footer, 0); |
59294e46 | 255 | if (ret < 0) { |
32f6439c | 256 | error_setg(errp, "Unable to read VHD header"); |
6a0f9e82 | 257 | goto fail; |
59294e46 | 258 | } |
6a0f9e82 | 259 | |
275734e4 | 260 | footer = &s->footer; |
24da78db | 261 | if (strncmp(footer->creator, "conectix", 8)) { |
9a4f4c31 | 262 | int64_t offset = bdrv_getlength(bs->file->bs); |
59294e46 KW |
263 | if (offset < 0) { |
264 | ret = offset; | |
32f6439c | 265 | error_setg(errp, "Invalid file size"); |
59294e46 | 266 | goto fail; |
be7c5ddd | 267 | } else if (offset < sizeof(*footer)) { |
59294e46 | 268 | ret = -EINVAL; |
32f6439c | 269 | error_setg(errp, "File too small for a VHD header"); |
24da78db CA |
270 | goto fail; |
271 | } | |
59294e46 | 272 | |
24da78db | 273 | /* If a fixed disk, the footer is found only at the end of the file */ |
32cc71de AF |
274 | ret = bdrv_pread(bs->file, offset - sizeof(*footer), sizeof(*footer), |
275 | footer, 0); | |
59294e46 | 276 | if (ret < 0) { |
24da78db CA |
277 | goto fail; |
278 | } | |
7da9623c TH |
279 | if (strncmp(footer->creator, "conectix", 8) || |
280 | be32_to_cpu(footer->type) != VHD_FIXED) { | |
76abe407 PB |
281 | error_setg(errp, "invalid VPC image"); |
282 | ret = -EINVAL; | |
24da78db CA |
283 | goto fail; |
284 | } | |
285 | disk_type = VHD_FIXED; | |
286 | } | |
6a0f9e82 | 287 | |
57c7d9e5 AL |
288 | checksum = be32_to_cpu(footer->checksum); |
289 | footer->checksum = 0; | |
be7c5ddd | 290 | if (vpc_checksum(footer, sizeof(*footer)) != checksum) { |
04788ba2 MA |
291 | error_setg(errp, "Incorrect header checksum"); |
292 | ret = -EINVAL; | |
293 | goto fail; | |
294 | } | |
57c7d9e5 | 295 | |
c088b691 | 296 | /* Write 'checksum' back to footer, or else will leave it with zero. */ |
a4127c42 | 297 | footer->checksum = cpu_to_be32(checksum); |
c088b691 | 298 | |
9c057d0b JC |
299 | /* The visible size of a image in Virtual PC depends on the geometry |
300 | rather than on the size stored in the footer (the size in the footer | |
301 | is too large usually) */ | |
33ccf667 SH |
302 | bs->total_sectors = (int64_t) |
303 | be16_to_cpu(footer->cyls) * footer->heads * footer->secs_per_cyl; | |
1fa79228 | 304 | |
c540d53a JC |
305 | /* Microsoft Virtual PC and Microsoft Hyper-V produce and read |
306 | * VHD image sizes differently. VPC will rely on CHS geometry, | |
307 | * while Hyper-V and disk2vhd use the size specified in the footer. | |
308 | * | |
309 | * We use a couple of approaches to try and determine the correct method: | |
310 | * look at the Creator App field, and look for images that have CHS | |
311 | * geometry that is the maximum value. | |
312 | * | |
313 | * If the CHS geometry is the maximum CHS geometry, then we assume that | |
314 | * the size is the footer->current_size to avoid truncation. Otherwise, | |
315 | * we follow the table based on footer->creator_app: | |
316 | * | |
317 | * Known creator apps: | |
318 | * 'vpc ' : CHS Virtual PC (uses disk geometry) | |
319 | * 'qemu' : CHS QEMU (uses disk geometry) | |
fb9245c2 | 320 | * 'qem2' : current_size QEMU (uses current_size) |
c540d53a JC |
321 | * 'win ' : current_size Hyper-V |
322 | * 'd2v ' : current_size Disk2vhd | |
9bdfb9e8 | 323 | * 'tap\0' : current_size XenServer |
bab246db | 324 | * 'CTXS' : current_size XenConverter |
c540d53a JC |
325 | * |
326 | * The user can override the table values via drive options, however | |
327 | * even with an override we will still use current_size for images | |
328 | * that have CHS geometry of the maximum size. | |
329 | */ | |
330 | use_chs = (!!strncmp(footer->creator_app, "win ", 4) && | |
fb9245c2 | 331 | !!strncmp(footer->creator_app, "qem2", 4) && |
9bdfb9e8 | 332 | !!strncmp(footer->creator_app, "d2v ", 4) && |
bab246db | 333 | !!strncmp(footer->creator_app, "CTXS", 4) && |
9bdfb9e8 | 334 | !!memcmp(footer->creator_app, "tap", 4)) || s->force_use_chs; |
c540d53a JC |
335 | |
336 | if (!use_chs || bs->total_sectors == VHD_MAX_GEOMETRY || s->force_use_sz) { | |
03671ded | 337 | bs->total_sectors = be64_to_cpu(footer->current_size) / |
c540d53a | 338 | BDRV_SECTOR_SIZE; |
0173e7bb PL |
339 | } |
340 | ||
c23fb11b JC |
341 | /* Allow a maximum disk size of 2040 GiB */ |
342 | if (bs->total_sectors > VHD_MAX_SECTORS) { | |
59294e46 | 343 | ret = -EFBIG; |
efc8243d SH |
344 | goto fail; |
345 | } | |
346 | ||
24da78db | 347 | if (disk_type == VHD_DYNAMIC) { |
02df95c4 | 348 | ret = bdrv_pread(bs->file, be64_to_cpu(footer->data_offset), |
32cc71de | 349 | sizeof(dyndisk_header), &dyndisk_header, 0); |
59294e46 | 350 | if (ret < 0) { |
32f6439c | 351 | error_setg(errp, "Error reading dynamic VHD header"); |
24da78db CA |
352 | goto fail; |
353 | } | |
b9fa33a6 | 354 | |
e326f078 | 355 | if (strncmp(dyndisk_header.magic, "cxsparse", 8)) { |
32f6439c | 356 | error_setg(errp, "Invalid header magic"); |
59294e46 | 357 | ret = -EINVAL; |
24da78db CA |
358 | goto fail; |
359 | } | |
6a0f9e82 | 360 | |
e326f078 | 361 | s->block_size = be32_to_cpu(dyndisk_header.block_size); |
5e71dfad KW |
362 | if (!is_power_of_2(s->block_size) || s->block_size < BDRV_SECTOR_SIZE) { |
363 | error_setg(errp, "Invalid block size %" PRIu32, s->block_size); | |
364 | ret = -EINVAL; | |
365 | goto fail; | |
366 | } | |
24da78db | 367 | s->bitmap_size = ((s->block_size / (8 * 512)) + 511) & ~511; |
15d35bc5 | 368 | |
e326f078 | 369 | s->max_table_entries = be32_to_cpu(dyndisk_header.max_table_entries); |
97f1c45c JC |
370 | |
371 | if ((bs->total_sectors * 512) / s->block_size > 0xffffffffU) { | |
32f6439c | 372 | error_setg(errp, "Too many blocks"); |
97f1c45c JC |
373 | ret = -EINVAL; |
374 | goto fail; | |
375 | } | |
97f1c45c JC |
376 | |
377 | computed_size = (uint64_t) s->max_table_entries * s->block_size; | |
378 | if (computed_size < bs->total_sectors * 512) { | |
32f6439c | 379 | error_setg(errp, "Page table too small"); |
97f1c45c JC |
380 | ret = -EINVAL; |
381 | goto fail; | |
382 | } | |
383 | ||
b15deac7 JC |
384 | if (s->max_table_entries > SIZE_MAX / 4 || |
385 | s->max_table_entries > (int) INT_MAX / 4) { | |
386 | error_setg(errp, "Max Table Entries too large (%" PRId32 ")", | |
387 | s->max_table_entries); | |
388 | ret = -EINVAL; | |
389 | goto fail; | |
390 | } | |
391 | ||
392 | pagetable_size = (uint64_t) s->max_table_entries * 4; | |
393 | ||
9a4f4c31 | 394 | s->pagetable = qemu_try_blockalign(bs->file->bs, pagetable_size); |
5fb09cd5 | 395 | if (s->pagetable == NULL) { |
32f6439c | 396 | error_setg(errp, "Unable to allocate memory for page table"); |
5fb09cd5 KW |
397 | ret = -ENOMEM; |
398 | goto fail; | |
399 | } | |
b71d1c2e | 400 | |
e326f078 | 401 | s->bat_offset = be64_to_cpu(dyndisk_header.table_offset); |
59294e46 | 402 | |
32cc71de AF |
403 | ret = bdrv_pread(bs->file, s->bat_offset, pagetable_size, |
404 | s->pagetable, 0); | |
59294e46 | 405 | if (ret < 0) { |
32f6439c | 406 | error_setg(errp, "Error reading pagetable"); |
24da78db CA |
407 | goto fail; |
408 | } | |
b71d1c2e | 409 | |
24da78db | 410 | s->free_data_block_offset = |
b15deac7 | 411 | ROUND_UP(s->bat_offset + pagetable_size, 512); |
15d35bc5 | 412 | |
24da78db CA |
413 | for (i = 0; i < s->max_table_entries; i++) { |
414 | be32_to_cpus(&s->pagetable[i]); | |
415 | if (s->pagetable[i] != 0xFFFFFFFF) { | |
416 | int64_t next = (512 * (int64_t) s->pagetable[i]) + | |
417 | s->bitmap_size + s->block_size; | |
15d35bc5 | 418 | |
24da78db CA |
419 | if (next > s->free_data_block_offset) { |
420 | s->free_data_block_offset = next; | |
421 | } | |
422 | } | |
15d35bc5 | 423 | } |
15d35bc5 | 424 | |
81caa3cc EB |
425 | bs_size = bdrv_getlength(bs->file->bs); |
426 | if (bs_size < 0) { | |
427 | error_setg_errno(errp, -bs_size, "Unable to learn image size"); | |
428 | ret = bs_size; | |
429 | goto fail; | |
430 | } | |
431 | if (s->free_data_block_offset > bs_size) { | |
fb8fe35f PL |
432 | error_setg(errp, "block-vpc: free_data_block_offset points after " |
433 | "the end of file. The image has been truncated."); | |
434 | ret = -EINVAL; | |
435 | goto fail; | |
436 | } | |
437 | ||
24da78db | 438 | s->last_bitmap_offset = (int64_t) -1; |
6a0f9e82 | 439 | |
6a0f9e82 | 440 | #ifdef CACHE |
24da78db CA |
441 | s->pageentry_u8 = g_malloc(512); |
442 | s->pageentry_u32 = s->pageentry_u8; | |
443 | s->pageentry_u16 = s->pageentry_u8; | |
444 | s->last_pagetable = -1; | |
6a0f9e82 | 445 | #endif |
24da78db | 446 | } |
6a0f9e82 | 447 | |
612ff3d8 | 448 | /* Disable migration when VHD images are used */ |
4026f1c4 | 449 | bdrv_graph_rdlock_main_loop(); |
81e5f78a AG |
450 | error_setg(&s->migration_blocker, "The vpc format used by node '%s' " |
451 | "does not support live migration", | |
452 | bdrv_get_device_or_node_name(bs)); | |
4026f1c4 KW |
453 | bdrv_graph_rdunlock_main_loop(); |
454 | ||
c8a7fc51 | 455 | ret = migrate_add_blocker(&s->migration_blocker, errp); |
386f6c07 | 456 | if (ret < 0) { |
fe44dc91 AA |
457 | goto fail; |
458 | } | |
459 | ||
460 | qemu_co_mutex_init(&s->lock); | |
c317b646 | 461 | qemu_opts_del(opts); |
612ff3d8 | 462 | |
6a0f9e82 | 463 | return 0; |
59294e46 KW |
464 | |
465 | fail: | |
c317b646 | 466 | qemu_opts_del(opts); |
97f1c45c | 467 | qemu_vfree(s->pagetable); |
59294e46 KW |
468 | #ifdef CACHE |
469 | g_free(s->pageentry_u8); | |
470 | #endif | |
471 | return ret; | |
6a0f9e82 FB |
472 | } |
473 | ||
3fe4b700 JC |
474 | static int vpc_reopen_prepare(BDRVReopenState *state, |
475 | BlockReopenQueue *queue, Error **errp) | |
476 | { | |
477 | return 0; | |
478 | } | |
479 | ||
b71d1c2e AL |
480 | /* |
481 | * Returns the absolute byte offset of the given sector in the image file. | |
482 | * If the sector is not allocated, -1 is returned instead. | |
cfc87e00 PM |
483 | * If an error occurred trying to write an updated block bitmap back to |
484 | * the file, -2 is returned, and the error value is written to *err. | |
485 | * This can only happen for a write operation. | |
15d35bc5 AL |
486 | * |
487 | * The parameter write must be 1 if the offset will be used for a write | |
488 | * operation (the block bitmaps is updated then), 0 otherwise. | |
cfc87e00 | 489 | * If write is true then err must not be NULL. |
b71d1c2e | 490 | */ |
517b5dff PB |
491 | static int64_t coroutine_fn GRAPH_RDLOCK |
492 | get_image_offset(BlockDriverState *bs, uint64_t offset, bool write, int *err) | |
6a0f9e82 FB |
493 | { |
494 | BDRVVPCState *s = bs->opaque; | |
6a0f9e82 | 495 | uint64_t bitmap_offset, block_offset; |
d46b7cc6 | 496 | uint32_t pagetable_index, offset_in_block; |
6a0f9e82 | 497 | |
cfc87e00 PM |
498 | assert(!(write && err == NULL)); |
499 | ||
2cfacb62 | 500 | pagetable_index = offset / s->block_size; |
d46b7cc6 | 501 | offset_in_block = offset % s->block_size; |
3b46e624 | 502 | |
15d35bc5 | 503 | if (pagetable_index >= s->max_table_entries || s->pagetable[pagetable_index] == 0xffffffff) |
9c057d0b | 504 | return -1; /* not allocated */ |
6a0f9e82 | 505 | |
378e2aea | 506 | bitmap_offset = 512 * (uint64_t) s->pagetable[pagetable_index]; |
d46b7cc6 | 507 | block_offset = bitmap_offset + s->bitmap_size + offset_in_block; |
15d35bc5 | 508 | |
9c057d0b JC |
509 | /* We must ensure that we don't write to any sectors which are marked as |
510 | unused in the bitmap. We get away with setting all bits in the block | |
511 | bitmap each time we write to a new block. This might cause Virtual PC to | |
512 | miss sparse read optimization, but it's not a problem in terms of | |
513 | correctness. */ | |
15d35bc5 | 514 | if (write && (s->last_bitmap_offset != bitmap_offset)) { |
3c2c599c | 515 | g_autofree uint8_t *bitmap = g_malloc(s->bitmap_size); |
cfc87e00 | 516 | int r; |
15d35bc5 AL |
517 | |
518 | s->last_bitmap_offset = bitmap_offset; | |
519 | memset(bitmap, 0xff, s->bitmap_size); | |
517b5dff | 520 | r = bdrv_co_pwrite_sync(bs->file, bitmap_offset, s->bitmap_size, bitmap, 0); |
cfc87e00 PM |
521 | if (r < 0) { |
522 | *err = r; | |
523 | return -2; | |
524 | } | |
15d35bc5 | 525 | } |
3b46e624 | 526 | |
b71d1c2e | 527 | return block_offset; |
6a0f9e82 FB |
528 | } |
529 | ||
15d35bc5 AL |
530 | /* |
531 | * Writes the footer to the end of the image file. This is needed when the | |
532 | * file grows as it overwrites the old footer | |
533 | * | |
534 | * Returns 0 on success and < 0 on error | |
535 | */ | |
517b5dff | 536 | static int coroutine_fn GRAPH_RDLOCK rewrite_footer(BlockDriverState *bs) |
15d35bc5 AL |
537 | { |
538 | int ret; | |
539 | BDRVVPCState *s = bs->opaque; | |
540 | int64_t offset = s->free_data_block_offset; | |
541 | ||
517b5dff | 542 | ret = bdrv_co_pwrite_sync(bs->file, offset, sizeof(s->footer), &s->footer, 0); |
15d35bc5 AL |
543 | if (ret < 0) |
544 | return ret; | |
545 | ||
546 | return 0; | |
547 | } | |
548 | ||
549 | /* | |
550 | * Allocates a new block. This involves writing a new footer and updating | |
551 | * the Block Allocation Table to use the space at the old end of the image | |
552 | * file (overwriting the old footer) | |
553 | * | |
554 | * Returns the sectors' offset in the image file on success and < 0 on error | |
555 | */ | |
517b5dff PB |
556 | static int64_t coroutine_fn GRAPH_RDLOCK |
557 | alloc_block(BlockDriverState *bs, int64_t offset) | |
15d35bc5 AL |
558 | { |
559 | BDRVVPCState *s = bs->opaque; | |
560 | int64_t bat_offset; | |
561 | uint32_t index, bat_value; | |
562 | int ret; | |
3c2c599c | 563 | g_autofree uint8_t *bitmap = g_malloc(s->bitmap_size); |
15d35bc5 | 564 | |
9c057d0b | 565 | /* Check if sector_num is valid */ |
513b0f02 KW |
566 | if ((offset < 0) || (offset > bs->total_sectors * BDRV_SECTOR_SIZE)) { |
567 | return -EINVAL; | |
568 | } | |
15d35bc5 | 569 | |
9c057d0b | 570 | /* Write entry into in-memory BAT */ |
513b0f02 KW |
571 | index = offset / s->block_size; |
572 | assert(s->pagetable[index] == 0xFFFFFFFF); | |
15d35bc5 AL |
573 | s->pagetable[index] = s->free_data_block_offset / 512; |
574 | ||
9c057d0b | 575 | /* Initialize the block's bitmap */ |
15d35bc5 | 576 | memset(bitmap, 0xff, s->bitmap_size); |
517b5dff PB |
577 | ret = bdrv_co_pwrite_sync(bs->file, s->free_data_block_offset, |
578 | s->bitmap_size, bitmap, 0); | |
5bb1cbac KW |
579 | if (ret < 0) { |
580 | return ret; | |
581 | } | |
15d35bc5 | 582 | |
9c057d0b | 583 | /* Write new footer (the old one will be overwritten) */ |
15d35bc5 AL |
584 | s->free_data_block_offset += s->block_size + s->bitmap_size; |
585 | ret = rewrite_footer(bs); | |
586 | if (ret < 0) | |
587 | goto fail; | |
588 | ||
9c057d0b | 589 | /* Write BAT entry to disk */ |
15d35bc5 | 590 | bat_offset = s->bat_offset + (4 * index); |
a4127c42 | 591 | bat_value = cpu_to_be32(s->pagetable[index]); |
517b5dff | 592 | ret = bdrv_co_pwrite_sync(bs->file, bat_offset, 4, &bat_value, 0); |
15d35bc5 AL |
593 | if (ret < 0) |
594 | goto fail; | |
595 | ||
cfc87e00 | 596 | return get_image_offset(bs, offset, false, NULL); |
15d35bc5 AL |
597 | |
598 | fail: | |
599 | s->free_data_block_offset -= (s->block_size + s->bitmap_size); | |
513b0f02 | 600 | return ret; |
15d35bc5 AL |
601 | } |
602 | ||
3d47eb0a EGE |
603 | static int coroutine_fn |
604 | vpc_co_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) | |
97b00e28 PB |
605 | { |
606 | BDRVVPCState *s = (BDRVVPCState *)bs->opaque; | |
97b00e28 | 607 | |
275734e4 | 608 | if (be32_to_cpu(s->footer.type) != VHD_FIXED) { |
97b00e28 PB |
609 | bdi->cluster_size = s->block_size; |
610 | } | |
611 | ||
612 | return 0; | |
613 | } | |
614 | ||
b9b10c35 | 615 | static int coroutine_fn GRAPH_RDLOCK |
f7ef38dd VSO |
616 | vpc_co_preadv(BlockDriverState *bs, int64_t offset, int64_t bytes, |
617 | QEMUIOVector *qiov, BdrvRequestFlags flags) | |
6a0f9e82 | 618 | { |
6c6ea921 | 619 | BDRVVPCState *s = bs->opaque; |
6a0f9e82 | 620 | int ret; |
d46b7cc6 KW |
621 | int64_t image_offset; |
622 | int64_t n_bytes; | |
623 | int64_t bytes_done = 0; | |
d46b7cc6 | 624 | QEMUIOVector local_qiov; |
6a0f9e82 | 625 | |
275734e4 | 626 | if (be32_to_cpu(s->footer.type) == VHD_FIXED) { |
a03ef88f | 627 | return bdrv_co_preadv(bs->file, offset, bytes, qiov, 0); |
24da78db | 628 | } |
b71d1c2e | 629 | |
d46b7cc6 KW |
630 | qemu_co_mutex_lock(&s->lock); |
631 | qemu_iovec_init(&local_qiov, qiov->niov); | |
6c6ea921 | 632 | |
d46b7cc6 | 633 | while (bytes > 0) { |
cfc87e00 | 634 | image_offset = get_image_offset(bs, offset, false, NULL); |
d46b7cc6 KW |
635 | n_bytes = MIN(bytes, s->block_size - (offset % s->block_size)); |
636 | ||
637 | if (image_offset == -1) { | |
638 | qemu_iovec_memset(qiov, bytes_done, 0, n_bytes); | |
b71d1c2e | 639 | } else { |
d46b7cc6 KW |
640 | qemu_iovec_reset(&local_qiov); |
641 | qemu_iovec_concat(&local_qiov, qiov, bytes_done, n_bytes); | |
642 | ||
126734c4 | 643 | qemu_co_mutex_unlock(&s->lock); |
a03ef88f | 644 | ret = bdrv_co_preadv(bs->file, image_offset, n_bytes, |
d46b7cc6 | 645 | &local_qiov, 0); |
126734c4 | 646 | qemu_co_mutex_lock(&s->lock); |
d46b7cc6 KW |
647 | if (ret < 0) { |
648 | goto fail; | |
6c6ea921 | 649 | } |
b71d1c2e AL |
650 | } |
651 | ||
d46b7cc6 KW |
652 | bytes -= n_bytes; |
653 | offset += n_bytes; | |
654 | bytes_done += n_bytes; | |
6a0f9e82 | 655 | } |
6a0f9e82 | 656 | |
d46b7cc6 KW |
657 | ret = 0; |
658 | fail: | |
659 | qemu_iovec_destroy(&local_qiov); | |
2914caa0 | 660 | qemu_co_mutex_unlock(&s->lock); |
d46b7cc6 | 661 | |
2914caa0 PB |
662 | return ret; |
663 | } | |
664 | ||
b9b10c35 | 665 | static int coroutine_fn GRAPH_RDLOCK |
e75abeda VSO |
666 | vpc_co_pwritev(BlockDriverState *bs, int64_t offset, int64_t bytes, |
667 | QEMUIOVector *qiov, BdrvRequestFlags flags) | |
15d35bc5 | 668 | { |
6c6ea921 | 669 | BDRVVPCState *s = bs->opaque; |
513b0f02 KW |
670 | int64_t image_offset; |
671 | int64_t n_bytes; | |
672 | int64_t bytes_done = 0; | |
c8115f8e | 673 | int ret = 0; |
513b0f02 | 674 | QEMUIOVector local_qiov; |
15d35bc5 | 675 | |
275734e4 | 676 | if (be32_to_cpu(s->footer.type) == VHD_FIXED) { |
a03ef88f | 677 | return bdrv_co_pwritev(bs->file, offset, bytes, qiov, 0); |
24da78db | 678 | } |
15d35bc5 | 679 | |
513b0f02 KW |
680 | qemu_co_mutex_lock(&s->lock); |
681 | qemu_iovec_init(&local_qiov, qiov->niov); | |
682 | ||
683 | while (bytes > 0) { | |
cfc87e00 PM |
684 | image_offset = get_image_offset(bs, offset, true, &ret); |
685 | if (image_offset == -2) { | |
686 | /* Failed to write block bitmap: can't proceed with write */ | |
687 | goto fail; | |
688 | } | |
513b0f02 | 689 | n_bytes = MIN(bytes, s->block_size - (offset % s->block_size)); |
6c6ea921 | 690 | |
513b0f02 KW |
691 | if (image_offset == -1) { |
692 | image_offset = alloc_block(bs, offset); | |
693 | if (image_offset < 0) { | |
694 | ret = image_offset; | |
695 | goto fail; | |
696 | } | |
15d35bc5 AL |
697 | } |
698 | ||
513b0f02 KW |
699 | qemu_iovec_reset(&local_qiov); |
700 | qemu_iovec_concat(&local_qiov, qiov, bytes_done, n_bytes); | |
701 | ||
126734c4 | 702 | qemu_co_mutex_unlock(&s->lock); |
a03ef88f | 703 | ret = bdrv_co_pwritev(bs->file, image_offset, n_bytes, |
513b0f02 | 704 | &local_qiov, 0); |
126734c4 | 705 | qemu_co_mutex_lock(&s->lock); |
513b0f02 KW |
706 | if (ret < 0) { |
707 | goto fail; | |
6c6ea921 | 708 | } |
15d35bc5 | 709 | |
513b0f02 KW |
710 | bytes -= n_bytes; |
711 | offset += n_bytes; | |
712 | bytes_done += n_bytes; | |
15d35bc5 AL |
713 | } |
714 | ||
513b0f02 KW |
715 | ret = 0; |
716 | fail: | |
717 | qemu_iovec_destroy(&local_qiov); | |
e183ef75 | 718 | qemu_co_mutex_unlock(&s->lock); |
513b0f02 | 719 | |
e183ef75 PB |
720 | return ret; |
721 | } | |
722 | ||
517b5dff PB |
723 | static int coroutine_fn GRAPH_RDLOCK |
724 | vpc_co_block_status(BlockDriverState *bs, bool want_zero, | |
725 | int64_t offset, int64_t bytes, | |
726 | int64_t *pnum, int64_t *map, | |
727 | BlockDriverState **file) | |
0cc84887 KW |
728 | { |
729 | BDRVVPCState *s = bs->opaque; | |
2f83673b | 730 | int64_t image_offset; |
0cc84887 | 731 | bool allocated; |
2f83673b EB |
732 | int ret; |
733 | int64_t n; | |
0cc84887 | 734 | |
275734e4 | 735 | if (be32_to_cpu(s->footer.type) == VHD_FIXED) { |
2f83673b EB |
736 | *pnum = bytes; |
737 | *map = offset; | |
7429e207 | 738 | *file = bs->file->bs; |
fbc8e1b7 | 739 | return BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID | BDRV_BLOCK_RECURSE; |
0cc84887 KW |
740 | } |
741 | ||
778b087e PB |
742 | qemu_co_mutex_lock(&s->lock); |
743 | ||
2f83673b EB |
744 | image_offset = get_image_offset(bs, offset, false, NULL); |
745 | allocated = (image_offset != -1); | |
0cc84887 | 746 | *pnum = 0; |
2c060c0f | 747 | ret = BDRV_BLOCK_ZERO; |
0cc84887 KW |
748 | |
749 | do { | |
750 | /* All sectors in a block are contiguous (without using the bitmap) */ | |
2f83673b EB |
751 | n = ROUND_UP(offset + 1, s->block_size) - offset; |
752 | n = MIN(n, bytes); | |
0cc84887 KW |
753 | |
754 | *pnum += n; | |
2f83673b EB |
755 | offset += n; |
756 | bytes -= n; | |
2ec711dc PL |
757 | /* *pnum can't be greater than one block for allocated |
758 | * sectors since there is always a bitmap in between. */ | |
759 | if (allocated) { | |
7429e207 | 760 | *file = bs->file->bs; |
2f83673b EB |
761 | *map = image_offset; |
762 | ret = BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID; | |
778b087e | 763 | break; |
2ec711dc | 764 | } |
2f83673b | 765 | if (bytes == 0) { |
0cc84887 KW |
766 | break; |
767 | } | |
2f83673b EB |
768 | image_offset = get_image_offset(bs, offset, false, NULL); |
769 | } while (image_offset == -1); | |
0cc84887 | 770 | |
778b087e PB |
771 | qemu_co_mutex_unlock(&s->lock); |
772 | return ret; | |
0cc84887 KW |
773 | } |
774 | ||
57c7d9e5 AL |
775 | /* |
776 | * Calculates the number of cylinders, heads and sectors per cylinder | |
777 | * based on a given number of sectors. This is the algorithm described | |
778 | * in the VHD specification. | |
779 | * | |
780 | * Note that the geometry doesn't always exactly match total_sectors but | |
781 | * may round it down. | |
6e9ea0c0 | 782 | * |
c23fb11b | 783 | * Returns 0 on success, -EFBIG if the size is larger than 2040 GiB. Override |
258d2edb CA |
784 | * the hardware EIDE and ATA-2 limit of 16 heads (max disk size of 127 GB) |
785 | * and instead allow up to 255 heads. | |
57c7d9e5 | 786 | */ |
5f14f31d | 787 | static int calculate_geometry(int64_t total_sectors, uint16_t *cyls, |
788 | uint8_t *heads, uint8_t *secs_per_cyl) | |
57c7d9e5 AL |
789 | { |
790 | uint32_t cyls_times_heads; | |
791 | ||
690cbb09 | 792 | total_sectors = MIN(total_sectors, VHD_MAX_GEOMETRY); |
57c7d9e5 | 793 | |
690cbb09 | 794 | if (total_sectors >= 65535LL * 16 * 63) { |
57c7d9e5 | 795 | *secs_per_cyl = 255; |
690cbb09 | 796 | *heads = 16; |
57c7d9e5 AL |
797 | cyls_times_heads = total_sectors / *secs_per_cyl; |
798 | } else { | |
799 | *secs_per_cyl = 17; | |
800 | cyls_times_heads = total_sectors / *secs_per_cyl; | |
13f1493f | 801 | *heads = DIV_ROUND_UP(cyls_times_heads, 1024); |
57c7d9e5 | 802 | |
690cbb09 | 803 | if (*heads < 4) { |
57c7d9e5 | 804 | *heads = 4; |
690cbb09 | 805 | } |
57c7d9e5 AL |
806 | |
807 | if (cyls_times_heads >= (*heads * 1024) || *heads > 16) { | |
808 | *secs_per_cyl = 31; | |
809 | *heads = 16; | |
810 | cyls_times_heads = total_sectors / *secs_per_cyl; | |
811 | } | |
812 | ||
813 | if (cyls_times_heads >= (*heads * 1024)) { | |
814 | *secs_per_cyl = 63; | |
815 | *heads = 16; | |
816 | cyls_times_heads = total_sectors / *secs_per_cyl; | |
817 | } | |
818 | } | |
819 | ||
dede4188 | 820 | *cyls = cyls_times_heads / *heads; |
6e9ea0c0 AJ |
821 | |
822 | return 0; | |
57c7d9e5 AL |
823 | } |
824 | ||
517b5dff PB |
825 | static int coroutine_fn create_dynamic_disk(BlockBackend *blk, VHDFooter *footer, |
826 | int64_t total_sectors) | |
57c7d9e5 | 827 | { |
e326f078 | 828 | VHDDynDiskHeader dyndisk_header; |
b0ce8cb0 | 829 | uint8_t bat_sector[512]; |
57c7d9e5 | 830 | size_t block_size, num_bat_entries; |
24da78db | 831 | int i; |
fef6070e JC |
832 | int ret; |
833 | int64_t offset = 0; | |
57c7d9e5 | 834 | |
9c057d0b | 835 | /* Write the footer (twice: at the beginning and at the end) */ |
57c7d9e5 | 836 | block_size = 0x200000; |
3f6de653 | 837 | num_bat_entries = DIV_ROUND_UP(total_sectors, block_size / 512); |
57c7d9e5 | 838 | |
517b5dff | 839 | ret = blk_co_pwrite(blk, offset, sizeof(*footer), footer, 0); |
40a99aac | 840 | if (ret < 0) { |
f0ff243a BS |
841 | goto fail; |
842 | } | |
57c7d9e5 | 843 | |
fef6070e | 844 | offset = 1536 + ((num_bat_entries * 4 + 511) & ~511); |
517b5dff | 845 | ret = blk_co_pwrite(blk, offset, sizeof(*footer), footer, 0); |
fef6070e | 846 | if (ret < 0) { |
f0ff243a BS |
847 | goto fail; |
848 | } | |
57c7d9e5 | 849 | |
9c057d0b | 850 | /* Write the initial BAT */ |
fef6070e | 851 | offset = 3 * 512; |
57c7d9e5 | 852 | |
b0ce8cb0 | 853 | memset(bat_sector, 0xFF, 512); |
13f1493f | 854 | for (i = 0; i < DIV_ROUND_UP(num_bat_entries * 4, 512); i++) { |
517b5dff | 855 | ret = blk_co_pwrite(blk, offset, 512, bat_sector, 0); |
fef6070e | 856 | if (ret < 0) { |
f0ff243a BS |
857 | goto fail; |
858 | } | |
fef6070e | 859 | offset += 512; |
f0ff243a | 860 | } |
57c7d9e5 | 861 | |
9c057d0b | 862 | /* Prepare the Dynamic Disk Header */ |
3d6101a3 | 863 | memset(&dyndisk_header, 0, sizeof(dyndisk_header)); |
57c7d9e5 | 864 | |
e326f078 | 865 | memcpy(dyndisk_header.magic, "cxsparse", 8); |
57c7d9e5 | 866 | |
78439f6a CA |
867 | /* |
868 | * Note: The spec is actually wrong here for data_offset, it says | |
869 | * 0xFFFFFFFF, but MS tools expect all 64 bits to be set. | |
870 | */ | |
e326f078 MA |
871 | dyndisk_header.data_offset = cpu_to_be64(0xFFFFFFFFFFFFFFFFULL); |
872 | dyndisk_header.table_offset = cpu_to_be64(3 * 512); | |
873 | dyndisk_header.version = cpu_to_be32(0x00010000); | |
874 | dyndisk_header.block_size = cpu_to_be32(block_size); | |
875 | dyndisk_header.max_table_entries = cpu_to_be32(num_bat_entries); | |
57c7d9e5 | 876 | |
3d6101a3 MA |
877 | dyndisk_header.checksum = cpu_to_be32( |
878 | vpc_checksum(&dyndisk_header, sizeof(dyndisk_header))); | |
57c7d9e5 | 879 | |
9c057d0b | 880 | /* Write the header */ |
fef6070e | 881 | offset = 512; |
57c7d9e5 | 882 | |
517b5dff | 883 | ret = blk_co_pwrite(blk, offset, sizeof(dyndisk_header), &dyndisk_header, 0); |
fef6070e | 884 | if (ret < 0) { |
f0ff243a BS |
885 | goto fail; |
886 | } | |
f0ff243a | 887 | |
1a37e312 | 888 | ret = 0; |
24da78db CA |
889 | fail: |
890 | return ret; | |
891 | } | |
892 | ||
517b5dff PB |
893 | static int coroutine_fn create_fixed_disk(BlockBackend *blk, VHDFooter *footer, |
894 | int64_t total_size, Error **errp) | |
24da78db | 895 | { |
fef6070e | 896 | int ret; |
24da78db CA |
897 | |
898 | /* Add footer to total size */ | |
be7c5ddd | 899 | total_size += sizeof(*footer); |
fef6070e | 900 | |
517b5dff | 901 | ret = blk_co_truncate(blk, total_size, false, PREALLOC_MODE_OFF, 0, errp); |
fef6070e JC |
902 | if (ret < 0) { |
903 | return ret; | |
24da78db CA |
904 | } |
905 | ||
517b5dff PB |
906 | ret = blk_co_pwrite(blk, total_size - sizeof(*footer), sizeof(*footer), |
907 | footer, 0); | |
fef6070e | 908 | if (ret < 0) { |
ed3d2ec9 | 909 | error_setg_errno(errp, -ret, "Unable to write VHD header"); |
fef6070e JC |
910 | return ret; |
911 | } | |
24da78db | 912 | |
1a37e312 | 913 | return 0; |
24da78db CA |
914 | } |
915 | ||
1cfeaf38 KW |
916 | static int calculate_rounded_image_size(BlockdevCreateOptionsVpc *vpc_opts, |
917 | uint16_t *out_cyls, | |
918 | uint8_t *out_heads, | |
919 | uint8_t *out_secs_per_cyl, | |
920 | int64_t *out_total_sectors, | |
921 | Error **errp) | |
922 | { | |
923 | int64_t total_size = vpc_opts->size; | |
924 | uint16_t cyls = 0; | |
925 | uint8_t heads = 0; | |
926 | uint8_t secs_per_cyl = 0; | |
927 | int64_t total_sectors; | |
928 | int i; | |
929 | ||
930 | /* | |
931 | * Calculate matching total_size and geometry. Increase the number of | |
932 | * sectors requested until we get enough (or fail). This ensures that | |
933 | * qemu-img convert doesn't truncate images, but rather rounds up. | |
934 | * | |
935 | * If the image size can't be represented by a spec conformant CHS geometry, | |
936 | * we set the geometry to 65535 x 16 x 255 (CxHxS) sectors and use | |
937 | * the image size from the VHD footer to calculate total_sectors. | |
938 | */ | |
939 | if (vpc_opts->force_size) { | |
940 | /* This will force the use of total_size for sector count, below */ | |
941 | cyls = VHD_CHS_MAX_C; | |
942 | heads = VHD_CHS_MAX_H; | |
943 | secs_per_cyl = VHD_CHS_MAX_S; | |
944 | } else { | |
945 | total_sectors = MIN(VHD_MAX_GEOMETRY, total_size / BDRV_SECTOR_SIZE); | |
946 | for (i = 0; total_sectors > (int64_t)cyls * heads * secs_per_cyl; i++) { | |
947 | calculate_geometry(total_sectors + i, &cyls, &heads, &secs_per_cyl); | |
948 | } | |
949 | } | |
950 | ||
951 | if ((int64_t)cyls * heads * secs_per_cyl == VHD_MAX_GEOMETRY) { | |
952 | total_sectors = total_size / BDRV_SECTOR_SIZE; | |
953 | /* Allow a maximum disk size of 2040 GiB */ | |
954 | if (total_sectors > VHD_MAX_SECTORS) { | |
955 | error_setg(errp, "Disk size is too large, max size is 2040 GiB"); | |
956 | return -EFBIG; | |
957 | } | |
958 | } else { | |
959 | total_sectors = (int64_t) cyls * heads * secs_per_cyl; | |
960 | } | |
961 | ||
962 | *out_total_sectors = total_sectors; | |
963 | if (out_cyls) { | |
964 | *out_cyls = cyls; | |
965 | *out_heads = heads; | |
966 | *out_secs_per_cyl = secs_per_cyl; | |
967 | } | |
968 | ||
969 | return 0; | |
970 | } | |
971 | ||
4db7ba3b KW |
972 | static int coroutine_fn GRAPH_UNLOCKED |
973 | vpc_co_create(BlockdevCreateOptions *opts, Error **errp) | |
24da78db | 974 | { |
182c8835 KW |
975 | BlockdevCreateOptionsVpc *vpc_opts; |
976 | BlockBackend *blk = NULL; | |
977 | BlockDriverState *bs = NULL; | |
978 | ||
275734e4 | 979 | VHDFooter footer; |
24da78db CA |
980 | uint16_t cyls = 0; |
981 | uint8_t heads = 0; | |
982 | uint8_t secs_per_cyl = 0; | |
983 | int64_t total_sectors; | |
984 | int64_t total_size; | |
985 | int disk_type; | |
986 | int ret = -EIO; | |
0dbaaa79 | 987 | QemuUUID uuid; |
24da78db | 988 | |
182c8835 KW |
989 | assert(opts->driver == BLOCKDEV_DRIVER_VPC); |
990 | vpc_opts = &opts->u.vpc; | |
991 | ||
992 | /* Validate options and set default values */ | |
993 | total_size = vpc_opts->size; | |
994 | ||
995 | if (!vpc_opts->has_subformat) { | |
996 | vpc_opts->subformat = BLOCKDEV_VPC_SUBFORMAT_DYNAMIC; | |
997 | } | |
998 | switch (vpc_opts->subformat) { | |
999 | case BLOCKDEV_VPC_SUBFORMAT_DYNAMIC: | |
24da78db | 1000 | disk_type = VHD_DYNAMIC; |
182c8835 KW |
1001 | break; |
1002 | case BLOCKDEV_VPC_SUBFORMAT_FIXED: | |
1003 | disk_type = VHD_FIXED; | |
1004 | break; | |
1005 | default: | |
1006 | g_assert_not_reached(); | |
24da78db CA |
1007 | } |
1008 | ||
182c8835 | 1009 | /* Create BlockBackend to write to the image */ |
6ef02851 | 1010 | bs = bdrv_co_open_blockdev_ref(vpc_opts->file, errp); |
182c8835 KW |
1011 | if (bs == NULL) { |
1012 | return -EIO; | |
24da78db | 1013 | } |
b8f45cdf | 1014 | |
6ef02851 KW |
1015 | blk = blk_co_new_with_bs(bs, BLK_PERM_WRITE | BLK_PERM_RESIZE, BLK_PERM_ALL, |
1016 | errp); | |
a3aeeab5 EB |
1017 | if (!blk) { |
1018 | ret = -EPERM; | |
fef6070e | 1019 | goto out; |
4ab15590 | 1020 | } |
b8f45cdf KW |
1021 | blk_set_allow_write_beyond_eof(blk, true); |
1022 | ||
1cfeaf38 KW |
1023 | /* Get geometry and check that it matches the image size*/ |
1024 | ret = calculate_rounded_image_size(vpc_opts, &cyls, &heads, &secs_per_cyl, | |
1025 | &total_sectors, errp); | |
1026 | if (ret < 0) { | |
1027 | goto out; | |
690cbb09 PL |
1028 | } |
1029 | ||
1cfeaf38 KW |
1030 | if (total_size != total_sectors * BDRV_SECTOR_SIZE) { |
1031 | error_setg(errp, "The requested image size cannot be represented in " | |
1032 | "CHS geometry"); | |
1033 | error_append_hint(errp, "Try size=%llu or force-size=on (the " | |
1034 | "latter makes the image incompatible with " | |
1035 | "Virtual PC)", | |
1036 | total_sectors * BDRV_SECTOR_SIZE); | |
1037 | ret = -EINVAL; | |
1038 | goto out; | |
24da78db | 1039 | } |
ecd880d9 | 1040 | |
24da78db | 1041 | /* Prepare the Hard Disk Footer */ |
be7c5ddd | 1042 | memset(&footer, 0, sizeof(footer)); |
24da78db | 1043 | |
275734e4 | 1044 | memcpy(footer.creator, "conectix", 8); |
182c8835 | 1045 | if (vpc_opts->force_size) { |
275734e4 | 1046 | memcpy(footer.creator_app, "qem2", 4); |
fb9245c2 | 1047 | } else { |
275734e4 | 1048 | memcpy(footer.creator_app, "qemu", 4); |
fb9245c2 | 1049 | } |
275734e4 | 1050 | memcpy(footer.creator_os, "Wi2k", 4); |
24da78db | 1051 | |
275734e4 MA |
1052 | footer.features = cpu_to_be32(0x02); |
1053 | footer.version = cpu_to_be32(0x00010000); | |
24da78db | 1054 | if (disk_type == VHD_DYNAMIC) { |
be7c5ddd | 1055 | footer.data_offset = cpu_to_be64(sizeof(footer)); |
24da78db | 1056 | } else { |
275734e4 | 1057 | footer.data_offset = cpu_to_be64(0xFFFFFFFFFFFFFFFFULL); |
24da78db | 1058 | } |
275734e4 | 1059 | footer.timestamp = cpu_to_be32(time(NULL) - VHD_TIMESTAMP_BASE); |
24da78db CA |
1060 | |
1061 | /* Version of Virtual PC 2007 */ | |
275734e4 MA |
1062 | footer.major = cpu_to_be16(0x0005); |
1063 | footer.minor = cpu_to_be16(0x0003); | |
1064 | footer.orig_size = cpu_to_be64(total_size); | |
1065 | footer.current_size = cpu_to_be64(total_size); | |
1066 | footer.cyls = cpu_to_be16(cyls); | |
1067 | footer.heads = heads; | |
1068 | footer.secs_per_cyl = secs_per_cyl; | |
24da78db | 1069 | |
275734e4 | 1070 | footer.type = cpu_to_be32(disk_type); |
24da78db | 1071 | |
0dbaaa79 | 1072 | qemu_uuid_generate(&uuid); |
275734e4 | 1073 | footer.uuid = uuid; |
24da78db | 1074 | |
be7c5ddd | 1075 | footer.checksum = cpu_to_be32(vpc_checksum(&footer, sizeof(footer))); |
24da78db CA |
1076 | |
1077 | if (disk_type == VHD_DYNAMIC) { | |
a3d27617 | 1078 | ret = create_dynamic_disk(blk, &footer, total_sectors); |
ed3d2ec9 HR |
1079 | if (ret < 0) { |
1080 | error_setg(errp, "Unable to create or write VHD header"); | |
1081 | } | |
24da78db | 1082 | } else { |
a3d27617 | 1083 | ret = create_fixed_disk(blk, &footer, total_size, errp); |
0211b9be | 1084 | } |
24da78db | 1085 | |
fec9921f | 1086 | out: |
b2ab5f54 KW |
1087 | blk_co_unref(blk); |
1088 | bdrv_co_unref(bs); | |
182c8835 KW |
1089 | return ret; |
1090 | } | |
1091 | ||
4db7ba3b | 1092 | static int coroutine_fn GRAPH_UNLOCKED |
4ec8df01 KW |
1093 | vpc_co_create_opts(BlockDriver *drv, const char *filename, |
1094 | QemuOpts *opts, Error **errp) | |
182c8835 KW |
1095 | { |
1096 | BlockdevCreateOptions *create_options = NULL; | |
92adf9db | 1097 | QDict *qdict; |
182c8835 KW |
1098 | Visitor *v; |
1099 | BlockDriverState *bs = NULL; | |
182c8835 KW |
1100 | int ret; |
1101 | ||
1102 | static const QDictRenames opt_renames[] = { | |
1103 | { VPC_OPT_FORCE_SIZE, "force-size" }, | |
1104 | { NULL, NULL }, | |
1105 | }; | |
1106 | ||
1107 | /* Parse options and convert legacy syntax */ | |
1108 | qdict = qemu_opts_to_qdict_filtered(opts, NULL, &vpc_create_opts, true); | |
1109 | ||
1110 | if (!qdict_rename_keys(qdict, opt_renames, errp)) { | |
1111 | ret = -EINVAL; | |
1112 | goto fail; | |
1113 | } | |
1114 | ||
1115 | /* Create and open the file (protocol layer) */ | |
2475a0d0 | 1116 | ret = bdrv_co_create_file(filename, opts, errp); |
182c8835 | 1117 | if (ret < 0) { |
182c8835 KW |
1118 | goto fail; |
1119 | } | |
1120 | ||
6ef02851 KW |
1121 | bs = bdrv_co_open(filename, NULL, NULL, |
1122 | BDRV_O_RDWR | BDRV_O_RESIZE | BDRV_O_PROTOCOL, errp); | |
182c8835 KW |
1123 | if (bs == NULL) { |
1124 | ret = -EIO; | |
1125 | goto fail; | |
1126 | } | |
1127 | ||
1128 | /* Now get the QAPI type BlockdevCreateOptions */ | |
1129 | qdict_put_str(qdict, "driver", "vpc"); | |
1130 | qdict_put_str(qdict, "file", bs->node_name); | |
1131 | ||
af91062e MA |
1132 | v = qobject_input_visitor_new_flat_confused(qdict, errp); |
1133 | if (!v) { | |
182c8835 KW |
1134 | ret = -EINVAL; |
1135 | goto fail; | |
1136 | } | |
1137 | ||
b11a093c | 1138 | visit_type_BlockdevCreateOptions(v, NULL, &create_options, errp); |
182c8835 | 1139 | visit_free(v); |
b11a093c | 1140 | if (!create_options) { |
182c8835 KW |
1141 | ret = -EINVAL; |
1142 | goto fail; | |
1143 | } | |
1144 | ||
1145 | /* Silently round up size */ | |
1146 | assert(create_options->driver == BLOCKDEV_DRIVER_VPC); | |
1147 | create_options->u.vpc.size = | |
1148 | ROUND_UP(create_options->u.vpc.size, BDRV_SECTOR_SIZE); | |
1149 | ||
1cfeaf38 KW |
1150 | if (!create_options->u.vpc.force_size) { |
1151 | int64_t total_sectors; | |
1152 | ret = calculate_rounded_image_size(&create_options->u.vpc, NULL, NULL, | |
1153 | NULL, &total_sectors, errp); | |
1154 | if (ret < 0) { | |
1155 | goto fail; | |
1156 | } | |
1157 | ||
1158 | create_options->u.vpc.size = total_sectors * BDRV_SECTOR_SIZE; | |
1159 | } | |
1160 | ||
1161 | ||
182c8835 KW |
1162 | /* Create the vpc image (format layer) */ |
1163 | ret = vpc_co_create(create_options, errp); | |
1164 | ||
1165 | fail: | |
cb3e7f08 | 1166 | qobject_unref(qdict); |
b2ab5f54 | 1167 | bdrv_co_unref(bs); |
182c8835 | 1168 | qapi_free_BlockdevCreateOptions(create_options); |
f0ff243a | 1169 | return ret; |
57c7d9e5 AL |
1170 | } |
1171 | ||
182c8835 | 1172 | |
72c6cc94 KW |
1173 | static int vpc_has_zero_init(BlockDriverState *bs) |
1174 | { | |
1175 | BDRVVPCState *s = bs->opaque; | |
72c6cc94 | 1176 | |
275734e4 | 1177 | if (be32_to_cpu(s->footer.type) == VHD_FIXED) { |
9a4f4c31 | 1178 | return bdrv_has_zero_init(bs->file->bs); |
72c6cc94 KW |
1179 | } else { |
1180 | return 1; | |
1181 | } | |
1182 | } | |
1183 | ||
6a0f9e82 FB |
1184 | static void vpc_close(BlockDriverState *bs) |
1185 | { | |
1186 | BDRVVPCState *s = bs->opaque; | |
97f1c45c | 1187 | qemu_vfree(s->pagetable); |
6a0f9e82 | 1188 | #ifdef CACHE |
7267c094 | 1189 | g_free(s->pageentry_u8); |
6a0f9e82 | 1190 | #endif |
612ff3d8 | 1191 | |
c8a7fc51 | 1192 | migrate_del_blocker(&s->migration_blocker); |
6a0f9e82 FB |
1193 | } |
1194 | ||
fec9921f CL |
1195 | static QemuOptsList vpc_create_opts = { |
1196 | .name = "vpc-create-opts", | |
1197 | .head = QTAILQ_HEAD_INITIALIZER(vpc_create_opts.head), | |
1198 | .desc = { | |
1199 | { | |
1200 | .name = BLOCK_OPT_SIZE, | |
1201 | .type = QEMU_OPT_SIZE, | |
1202 | .help = "Virtual disk size" | |
1203 | }, | |
1204 | { | |
1205 | .name = BLOCK_OPT_SUBFMT, | |
1206 | .type = QEMU_OPT_STRING, | |
1207 | .help = | |
1208 | "Type of virtual hard disk format. Supported formats are " | |
1209 | "{dynamic (default) | fixed} " | |
1210 | }, | |
fb9245c2 JC |
1211 | { |
1212 | .name = VPC_OPT_FORCE_SIZE, | |
1213 | .type = QEMU_OPT_BOOL, | |
1214 | .help = "Force disk size calculation to use the actual size " | |
1215 | "specified, rather than using the nearest CHS-based " | |
1216 | "calculation" | |
1217 | }, | |
fec9921f CL |
1218 | { /* end of list */ } |
1219 | } | |
0e7e1989 KW |
1220 | }; |
1221 | ||
2654267c HR |
1222 | static const char *const vpc_strong_runtime_opts[] = { |
1223 | VPC_OPT_SIZE_CALC, | |
1224 | ||
1225 | NULL | |
1226 | }; | |
1227 | ||
5efa9d5a | 1228 | static BlockDriver bdrv_vpc = { |
4a411185 KW |
1229 | .format_name = "vpc", |
1230 | .instance_size = sizeof(BDRVVPCState), | |
c68b89ac | 1231 | |
72c6cc94 KW |
1232 | .bdrv_probe = vpc_probe, |
1233 | .bdrv_open = vpc_open, | |
1234 | .bdrv_close = vpc_close, | |
1235 | .bdrv_reopen_prepare = vpc_reopen_prepare, | |
69dca43d | 1236 | .bdrv_child_perm = bdrv_default_perms, |
182c8835 | 1237 | .bdrv_co_create = vpc_co_create, |
efc75e2a | 1238 | .bdrv_co_create_opts = vpc_co_create_opts, |
0e7e1989 | 1239 | |
d46b7cc6 | 1240 | .bdrv_co_preadv = vpc_co_preadv, |
513b0f02 | 1241 | .bdrv_co_pwritev = vpc_co_pwritev, |
2f83673b | 1242 | .bdrv_co_block_status = vpc_co_block_status, |
c68b89ac | 1243 | |
3d47eb0a | 1244 | .bdrv_co_get_info = vpc_co_get_info, |
97b00e28 | 1245 | |
d67066d8 | 1246 | .is_format = true, |
fec9921f | 1247 | .create_opts = &vpc_create_opts, |
72c6cc94 | 1248 | .bdrv_has_zero_init = vpc_has_zero_init, |
2654267c | 1249 | .strong_runtime_opts = vpc_strong_runtime_opts, |
6a0f9e82 | 1250 | }; |
5efa9d5a AL |
1251 | |
1252 | static void bdrv_vpc_init(void) | |
1253 | { | |
1254 | bdrv_register(&bdrv_vpc); | |
1255 | } | |
1256 | ||
1257 | block_init(bdrv_vpc_init); |