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Commit | Line | Data |
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9aebd98a SW |
1 | /* |
2 | * Block driver for the Virtual Disk Image (VDI) format | |
3 | * | |
641543b7 | 4 | * Copyright (c) 2009, 2012 Stefan Weil |
9aebd98a SW |
5 | * |
6 | * This program is free software: you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation, either version 2 of the License, or | |
9 | * (at your option) version 3 or any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
18 | * | |
19 | * Reference: | |
20 | * http://forums.virtualbox.org/viewtopic.php?t=8046 | |
21 | * | |
22 | * This driver supports create / read / write operations on VDI images. | |
23 | * | |
24 | * Todo (see also TODO in code): | |
25 | * | |
26 | * Some features like snapshots are still missing. | |
27 | * | |
28 | * Deallocation of zero-filled blocks and shrinking images are missing, too | |
29 | * (might be added to common block layer). | |
30 | * | |
31 | * Allocation of blocks could be optimized (less writes to block map and | |
32 | * header). | |
33 | * | |
dc6fb73d | 34 | * Read and write of adjacent blocks could be done in one operation |
9aebd98a SW |
35 | * (current code uses one operation per block (1 MiB). |
36 | * | |
37 | * The code is not thread safe (missing locks for changes in header and | |
38 | * block table, no problem with current QEMU). | |
39 | * | |
40 | * Hints: | |
41 | * | |
42 | * Blocks (VDI documentation) correspond to clusters (QEMU). | |
43 | * QEMU's backing files could be implemented using VDI snapshot files (TODO). | |
44 | * VDI snapshot files may also contain the complete machine state. | |
45 | * Maybe this machine state can be converted to QEMU PC machine snapshot data. | |
46 | * | |
47 | * The driver keeps a block cache (little endian entries) in memory. | |
48 | * For the standard block size (1 MiB), a 1 TiB disk will use 4 MiB RAM, | |
49 | * so this seems to be reasonable. | |
50 | */ | |
51 | ||
80c71a24 | 52 | #include "qemu/osdep.h" |
da34e65c | 53 | #include "qapi/error.h" |
9aebd98a | 54 | #include "qemu-common.h" |
737e150e | 55 | #include "block/block_int.h" |
a08f0c3b | 56 | #include "sysemu/block-backend.h" |
1de7afc9 | 57 | #include "qemu/module.h" |
caf71f86 | 58 | #include "migration/migration.h" |
10817bf0 | 59 | #include "qemu/coroutine.h" |
9aebd98a | 60 | |
ee682d27 | 61 | #if defined(CONFIG_UUID) |
9aebd98a SW |
62 | #include <uuid/uuid.h> |
63 | #else | |
64 | /* TODO: move uuid emulation to some central place in QEMU. */ | |
9c17d615 | 65 | #include "sysemu/sysemu.h" /* UUID_FMT */ |
9aebd98a | 66 | typedef unsigned char uuid_t[16]; |
9aebd98a SW |
67 | #endif |
68 | ||
69 | /* Code configuration options. */ | |
70 | ||
71 | /* Enable debug messages. */ | |
72 | //~ #define CONFIG_VDI_DEBUG | |
73 | ||
74 | /* Support write operations on VDI images. */ | |
75 | #define CONFIG_VDI_WRITE | |
76 | ||
77 | /* Support non-standard block (cluster) size. This is untested. | |
78 | * Maybe it will be needed for very large images. | |
79 | */ | |
80 | //~ #define CONFIG_VDI_BLOCK_SIZE | |
81 | ||
82 | /* Support static (fixed, pre-allocated) images. */ | |
83 | #define CONFIG_VDI_STATIC_IMAGE | |
84 | ||
85 | /* Command line option for static images. */ | |
86 | #define BLOCK_OPT_STATIC "static" | |
87 | ||
88 | #define KiB 1024 | |
89 | #define MiB (KiB * KiB) | |
90 | ||
91 | #define SECTOR_SIZE 512 | |
99cce9fa | 92 | #define DEFAULT_CLUSTER_SIZE (1 * MiB) |
9aebd98a SW |
93 | |
94 | #if defined(CONFIG_VDI_DEBUG) | |
95 | #define logout(fmt, ...) \ | |
96 | fprintf(stderr, "vdi\t%-24s" fmt, __func__, ##__VA_ARGS__) | |
97 | #else | |
98 | #define logout(fmt, ...) ((void)0) | |
99 | #endif | |
100 | ||
101 | /* Image signature. */ | |
102 | #define VDI_SIGNATURE 0xbeda107f | |
103 | ||
104 | /* Image version. */ | |
105 | #define VDI_VERSION_1_1 0x00010001 | |
106 | ||
107 | /* Image type. */ | |
108 | #define VDI_TYPE_DYNAMIC 1 | |
109 | #define VDI_TYPE_STATIC 2 | |
110 | ||
111 | /* Innotek / SUN images use these strings in header.text: | |
112 | * "<<< innotek VirtualBox Disk Image >>>\n" | |
113 | * "<<< Sun xVM VirtualBox Disk Image >>>\n" | |
114 | * "<<< Sun VirtualBox Disk Image >>>\n" | |
115 | * The value does not matter, so QEMU created images use a different text. | |
116 | */ | |
117 | #define VDI_TEXT "<<< QEMU VM Virtual Disk Image >>>\n" | |
118 | ||
c794b4e0 ES |
119 | /* A never-allocated block; semantically arbitrary content. */ |
120 | #define VDI_UNALLOCATED 0xffffffffU | |
121 | ||
122 | /* A discarded (no longer allocated) block; semantically zero-filled. */ | |
123 | #define VDI_DISCARDED 0xfffffffeU | |
124 | ||
125 | #define VDI_IS_ALLOCATED(X) ((X) < VDI_DISCARDED) | |
9aebd98a | 126 | |
d20418ee HR |
127 | /* The bmap will take up VDI_BLOCKS_IN_IMAGE_MAX * sizeof(uint32_t) bytes; since |
128 | * the bmap is read and written in a single operation, its size needs to be | |
129 | * limited to INT_MAX; furthermore, when opening an image, the bmap size is | |
130 | * rounded up to be aligned on BDRV_SECTOR_SIZE. | |
131 | * Therefore this should satisfy the following: | |
132 | * VDI_BLOCKS_IN_IMAGE_MAX * sizeof(uint32_t) + BDRV_SECTOR_SIZE == INT_MAX + 1 | |
133 | * (INT_MAX + 1 is the first value not representable as an int) | |
134 | * This guarantees that any value below or equal to the constant will, when | |
135 | * multiplied by sizeof(uint32_t) and rounded up to a BDRV_SECTOR_SIZE boundary, | |
136 | * still be below or equal to INT_MAX. */ | |
137 | #define VDI_BLOCKS_IN_IMAGE_MAX \ | |
138 | ((unsigned)((INT_MAX + 1u - BDRV_SECTOR_SIZE) / sizeof(uint32_t))) | |
63fa06dc JC |
139 | #define VDI_DISK_SIZE_MAX ((uint64_t)VDI_BLOCKS_IN_IMAGE_MAX * \ |
140 | (uint64_t)DEFAULT_CLUSTER_SIZE) | |
141 | ||
ee682d27 | 142 | #if !defined(CONFIG_UUID) |
8ba2aae3 | 143 | static inline void uuid_generate(uuid_t out) |
9aebd98a | 144 | { |
4f3669ea | 145 | memset(out, 0, sizeof(uuid_t)); |
9aebd98a SW |
146 | } |
147 | ||
8ba2aae3 | 148 | static inline int uuid_is_null(const uuid_t uu) |
9aebd98a SW |
149 | { |
150 | uuid_t null_uuid = { 0 }; | |
4f3669ea | 151 | return memcmp(uu, null_uuid, sizeof(uuid_t)) == 0; |
9aebd98a SW |
152 | } |
153 | ||
f18a768e | 154 | # if defined(CONFIG_VDI_DEBUG) |
8ba2aae3 | 155 | static inline void uuid_unparse(const uuid_t uu, char *out) |
9aebd98a SW |
156 | { |
157 | snprintf(out, 37, UUID_FMT, | |
158 | uu[0], uu[1], uu[2], uu[3], uu[4], uu[5], uu[6], uu[7], | |
159 | uu[8], uu[9], uu[10], uu[11], uu[12], uu[13], uu[14], uu[15]); | |
160 | } | |
f18a768e | 161 | # endif |
9aebd98a SW |
162 | #endif |
163 | ||
9aebd98a SW |
164 | typedef struct { |
165 | char text[0x40]; | |
166 | uint32_t signature; | |
167 | uint32_t version; | |
168 | uint32_t header_size; | |
169 | uint32_t image_type; | |
170 | uint32_t image_flags; | |
171 | char description[256]; | |
172 | uint32_t offset_bmap; | |
173 | uint32_t offset_data; | |
174 | uint32_t cylinders; /* disk geometry, unused here */ | |
175 | uint32_t heads; /* disk geometry, unused here */ | |
176 | uint32_t sectors; /* disk geometry, unused here */ | |
177 | uint32_t sector_size; | |
178 | uint32_t unused1; | |
179 | uint64_t disk_size; | |
180 | uint32_t block_size; | |
181 | uint32_t block_extra; /* unused here */ | |
182 | uint32_t blocks_in_image; | |
183 | uint32_t blocks_allocated; | |
184 | uuid_t uuid_image; | |
185 | uuid_t uuid_last_snap; | |
186 | uuid_t uuid_link; | |
187 | uuid_t uuid_parent; | |
188 | uint64_t unused2[7]; | |
8368febd | 189 | } QEMU_PACKED VdiHeader; |
9aebd98a SW |
190 | |
191 | typedef struct { | |
9aebd98a SW |
192 | /* The block map entries are little endian (even in memory). */ |
193 | uint32_t *bmap; | |
194 | /* Size of block (bytes). */ | |
195 | uint32_t block_size; | |
196 | /* Size of block (sectors). */ | |
197 | uint32_t block_sectors; | |
198 | /* First sector of block map. */ | |
199 | uint32_t bmap_sector; | |
4ff9786c | 200 | /* VDI header (converted to host endianness). */ |
9aebd98a | 201 | VdiHeader header; |
fc9d106c | 202 | |
f0ab6f10 HR |
203 | CoMutex write_lock; |
204 | ||
fc9d106c | 205 | Error *migration_blocker; |
9aebd98a SW |
206 | } BDRVVdiState; |
207 | ||
208 | /* Change UUID from little endian (IPRT = VirtualBox format) to big endian | |
209 | * format (network byte order, standard, see RFC 4122) and vice versa. | |
210 | */ | |
211 | static void uuid_convert(uuid_t uuid) | |
212 | { | |
213 | bswap32s((uint32_t *)&uuid[0]); | |
214 | bswap16s((uint16_t *)&uuid[4]); | |
215 | bswap16s((uint16_t *)&uuid[6]); | |
216 | } | |
217 | ||
218 | static void vdi_header_to_cpu(VdiHeader *header) | |
219 | { | |
220 | le32_to_cpus(&header->signature); | |
221 | le32_to_cpus(&header->version); | |
222 | le32_to_cpus(&header->header_size); | |
223 | le32_to_cpus(&header->image_type); | |
224 | le32_to_cpus(&header->image_flags); | |
225 | le32_to_cpus(&header->offset_bmap); | |
226 | le32_to_cpus(&header->offset_data); | |
227 | le32_to_cpus(&header->cylinders); | |
228 | le32_to_cpus(&header->heads); | |
229 | le32_to_cpus(&header->sectors); | |
230 | le32_to_cpus(&header->sector_size); | |
231 | le64_to_cpus(&header->disk_size); | |
232 | le32_to_cpus(&header->block_size); | |
233 | le32_to_cpus(&header->block_extra); | |
234 | le32_to_cpus(&header->blocks_in_image); | |
235 | le32_to_cpus(&header->blocks_allocated); | |
236 | uuid_convert(header->uuid_image); | |
237 | uuid_convert(header->uuid_last_snap); | |
238 | uuid_convert(header->uuid_link); | |
239 | uuid_convert(header->uuid_parent); | |
240 | } | |
241 | ||
242 | static void vdi_header_to_le(VdiHeader *header) | |
243 | { | |
244 | cpu_to_le32s(&header->signature); | |
245 | cpu_to_le32s(&header->version); | |
246 | cpu_to_le32s(&header->header_size); | |
247 | cpu_to_le32s(&header->image_type); | |
248 | cpu_to_le32s(&header->image_flags); | |
249 | cpu_to_le32s(&header->offset_bmap); | |
250 | cpu_to_le32s(&header->offset_data); | |
251 | cpu_to_le32s(&header->cylinders); | |
252 | cpu_to_le32s(&header->heads); | |
253 | cpu_to_le32s(&header->sectors); | |
254 | cpu_to_le32s(&header->sector_size); | |
255 | cpu_to_le64s(&header->disk_size); | |
256 | cpu_to_le32s(&header->block_size); | |
257 | cpu_to_le32s(&header->block_extra); | |
258 | cpu_to_le32s(&header->blocks_in_image); | |
259 | cpu_to_le32s(&header->blocks_allocated); | |
9aebd98a SW |
260 | uuid_convert(header->uuid_image); |
261 | uuid_convert(header->uuid_last_snap); | |
262 | uuid_convert(header->uuid_link); | |
263 | uuid_convert(header->uuid_parent); | |
264 | } | |
265 | ||
266 | #if defined(CONFIG_VDI_DEBUG) | |
267 | static void vdi_header_print(VdiHeader *header) | |
268 | { | |
269 | char uuid[37]; | |
270 | logout("text %s", header->text); | |
9f0470bb | 271 | logout("signature 0x%08x\n", header->signature); |
9aebd98a SW |
272 | logout("header size 0x%04x\n", header->header_size); |
273 | logout("image type 0x%04x\n", header->image_type); | |
274 | logout("image flags 0x%04x\n", header->image_flags); | |
275 | logout("description %s\n", header->description); | |
276 | logout("offset bmap 0x%04x\n", header->offset_bmap); | |
277 | logout("offset data 0x%04x\n", header->offset_data); | |
278 | logout("cylinders 0x%04x\n", header->cylinders); | |
279 | logout("heads 0x%04x\n", header->heads); | |
280 | logout("sectors 0x%04x\n", header->sectors); | |
281 | logout("sector size 0x%04x\n", header->sector_size); | |
282 | logout("image size 0x%" PRIx64 " B (%" PRIu64 " MiB)\n", | |
283 | header->disk_size, header->disk_size / MiB); | |
284 | logout("block size 0x%04x\n", header->block_size); | |
285 | logout("block extra 0x%04x\n", header->block_extra); | |
286 | logout("blocks tot. 0x%04x\n", header->blocks_in_image); | |
287 | logout("blocks all. 0x%04x\n", header->blocks_allocated); | |
288 | uuid_unparse(header->uuid_image, uuid); | |
289 | logout("uuid image %s\n", uuid); | |
290 | uuid_unparse(header->uuid_last_snap, uuid); | |
291 | logout("uuid snap %s\n", uuid); | |
292 | uuid_unparse(header->uuid_link, uuid); | |
293 | logout("uuid link %s\n", uuid); | |
294 | uuid_unparse(header->uuid_parent, uuid); | |
295 | logout("uuid parent %s\n", uuid); | |
296 | } | |
297 | #endif | |
298 | ||
4534ff54 KW |
299 | static int vdi_check(BlockDriverState *bs, BdrvCheckResult *res, |
300 | BdrvCheckMode fix) | |
9aebd98a SW |
301 | { |
302 | /* TODO: additional checks possible. */ | |
303 | BDRVVdiState *s = (BDRVVdiState *)bs->opaque; | |
9aebd98a SW |
304 | uint32_t blocks_allocated = 0; |
305 | uint32_t block; | |
306 | uint32_t *bmap; | |
307 | logout("\n"); | |
308 | ||
4534ff54 KW |
309 | if (fix) { |
310 | return -ENOTSUP; | |
311 | } | |
312 | ||
5839e53b | 313 | bmap = g_try_new(uint32_t, s->header.blocks_in_image); |
17cce735 KW |
314 | if (s->header.blocks_in_image && bmap == NULL) { |
315 | res->check_errors++; | |
316 | return -ENOMEM; | |
317 | } | |
318 | ||
9aebd98a SW |
319 | memset(bmap, 0xff, s->header.blocks_in_image * sizeof(uint32_t)); |
320 | ||
321 | /* Check block map and value of blocks_allocated. */ | |
322 | for (block = 0; block < s->header.blocks_in_image; block++) { | |
323 | uint32_t bmap_entry = le32_to_cpu(s->bmap[block]); | |
c794b4e0 | 324 | if (VDI_IS_ALLOCATED(bmap_entry)) { |
9aebd98a SW |
325 | if (bmap_entry < s->header.blocks_in_image) { |
326 | blocks_allocated++; | |
c794b4e0 | 327 | if (!VDI_IS_ALLOCATED(bmap[bmap_entry])) { |
9aebd98a SW |
328 | bmap[bmap_entry] = bmap_entry; |
329 | } else { | |
330 | fprintf(stderr, "ERROR: block index %" PRIu32 | |
331 | " also used by %" PRIu32 "\n", bmap[bmap_entry], bmap_entry); | |
9ac228e0 | 332 | res->corruptions++; |
9aebd98a SW |
333 | } |
334 | } else { | |
335 | fprintf(stderr, "ERROR: block index %" PRIu32 | |
336 | " too large, is %" PRIu32 "\n", block, bmap_entry); | |
9ac228e0 | 337 | res->corruptions++; |
9aebd98a SW |
338 | } |
339 | } | |
340 | } | |
341 | if (blocks_allocated != s->header.blocks_allocated) { | |
342 | fprintf(stderr, "ERROR: allocated blocks mismatch, is %" PRIu32 | |
343 | ", should be %" PRIu32 "\n", | |
344 | blocks_allocated, s->header.blocks_allocated); | |
9ac228e0 | 345 | res->corruptions++; |
9aebd98a SW |
346 | } |
347 | ||
7267c094 | 348 | g_free(bmap); |
9aebd98a | 349 | |
9ac228e0 | 350 | return 0; |
9aebd98a SW |
351 | } |
352 | ||
353 | static int vdi_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) | |
354 | { | |
355 | /* TODO: vdi_get_info would be needed for machine snapshots. | |
356 | vm_state_offset is still missing. */ | |
357 | BDRVVdiState *s = (BDRVVdiState *)bs->opaque; | |
358 | logout("\n"); | |
359 | bdi->cluster_size = s->block_size; | |
360 | bdi->vm_state_offset = 0; | |
95de6d70 | 361 | bdi->unallocated_blocks_are_zero = true; |
9aebd98a SW |
362 | return 0; |
363 | } | |
364 | ||
365 | static int vdi_make_empty(BlockDriverState *bs) | |
366 | { | |
367 | /* TODO: missing code. */ | |
368 | logout("\n"); | |
369 | /* The return value for missing code must be 0, see block.c. */ | |
370 | return 0; | |
371 | } | |
372 | ||
373 | static int vdi_probe(const uint8_t *buf, int buf_size, const char *filename) | |
374 | { | |
375 | const VdiHeader *header = (const VdiHeader *)buf; | |
dddc7750 | 376 | int ret = 0; |
9aebd98a SW |
377 | |
378 | logout("\n"); | |
379 | ||
380 | if (buf_size < sizeof(*header)) { | |
381 | /* Header too small, no VDI. */ | |
382 | } else if (le32_to_cpu(header->signature) == VDI_SIGNATURE) { | |
dddc7750 | 383 | ret = 100; |
9aebd98a SW |
384 | } |
385 | ||
dddc7750 | 386 | if (ret == 0) { |
9aebd98a SW |
387 | logout("no vdi image\n"); |
388 | } else { | |
389 | logout("%s", header->text); | |
390 | } | |
391 | ||
dddc7750 | 392 | return ret; |
9aebd98a SW |
393 | } |
394 | ||
015a1036 HR |
395 | static int vdi_open(BlockDriverState *bs, QDict *options, int flags, |
396 | Error **errp) | |
9aebd98a SW |
397 | { |
398 | BDRVVdiState *s = bs->opaque; | |
399 | VdiHeader header; | |
400 | size_t bmap_size; | |
8937f822 | 401 | int ret; |
9aebd98a SW |
402 | |
403 | logout("\n"); | |
404 | ||
9a4f4c31 | 405 | ret = bdrv_read(bs->file->bs, 0, (uint8_t *)&header, 1); |
8937f822 | 406 | if (ret < 0) { |
9aebd98a SW |
407 | goto fail; |
408 | } | |
409 | ||
410 | vdi_header_to_cpu(&header); | |
411 | #if defined(CONFIG_VDI_DEBUG) | |
412 | vdi_header_print(&header); | |
413 | #endif | |
414 | ||
63fa06dc JC |
415 | if (header.disk_size > VDI_DISK_SIZE_MAX) { |
416 | error_setg(errp, "Unsupported VDI image size (size is 0x%" PRIx64 | |
417 | ", max supported is 0x%" PRIx64 ")", | |
418 | header.disk_size, VDI_DISK_SIZE_MAX); | |
419 | ret = -ENOTSUP; | |
420 | goto fail; | |
421 | } | |
422 | ||
f21dc3a4 SW |
423 | if (header.disk_size % SECTOR_SIZE != 0) { |
424 | /* 'VBoxManage convertfromraw' can create images with odd disk sizes. | |
425 | We accept them but round the disk size to the next multiple of | |
426 | SECTOR_SIZE. */ | |
427 | logout("odd disk size %" PRIu64 " B, round up\n", header.disk_size); | |
e9082e47 | 428 | header.disk_size = ROUND_UP(header.disk_size, SECTOR_SIZE); |
f21dc3a4 SW |
429 | } |
430 | ||
0e87ba2c | 431 | if (header.signature != VDI_SIGNATURE) { |
521b2b5d HR |
432 | error_setg(errp, "Image not in VDI format (bad signature %08" PRIx32 |
433 | ")", header.signature); | |
76abe407 | 434 | ret = -EINVAL; |
0e87ba2c SW |
435 | goto fail; |
436 | } else if (header.version != VDI_VERSION_1_1) { | |
521b2b5d HR |
437 | error_setg(errp, "unsupported VDI image (version %" PRIu32 ".%" PRIu32 |
438 | ")", header.version >> 16, header.version & 0xffff); | |
8937f822 | 439 | ret = -ENOTSUP; |
9aebd98a SW |
440 | goto fail; |
441 | } else if (header.offset_bmap % SECTOR_SIZE != 0) { | |
442 | /* We only support block maps which start on a sector boundary. */ | |
5b7aa9b5 | 443 | error_setg(errp, "unsupported VDI image (unaligned block map offset " |
521b2b5d | 444 | "0x%" PRIx32 ")", header.offset_bmap); |
8937f822 | 445 | ret = -ENOTSUP; |
9aebd98a SW |
446 | goto fail; |
447 | } else if (header.offset_data % SECTOR_SIZE != 0) { | |
448 | /* We only support data blocks which start on a sector boundary. */ | |
521b2b5d HR |
449 | error_setg(errp, "unsupported VDI image (unaligned data offset 0x%" |
450 | PRIx32 ")", header.offset_data); | |
8937f822 | 451 | ret = -ENOTSUP; |
9aebd98a SW |
452 | goto fail; |
453 | } else if (header.sector_size != SECTOR_SIZE) { | |
521b2b5d HR |
454 | error_setg(errp, "unsupported VDI image (sector size %" PRIu32 |
455 | " is not %u)", header.sector_size, SECTOR_SIZE); | |
8937f822 | 456 | ret = -ENOTSUP; |
9aebd98a | 457 | goto fail; |
63fa06dc | 458 | } else if (header.block_size != DEFAULT_CLUSTER_SIZE) { |
521b2b5d HR |
459 | error_setg(errp, "unsupported VDI image (block size %" PRIu32 |
460 | " is not %u)", header.block_size, DEFAULT_CLUSTER_SIZE); | |
8937f822 | 461 | ret = -ENOTSUP; |
9aebd98a | 462 | goto fail; |
f21dc3a4 SW |
463 | } else if (header.disk_size > |
464 | (uint64_t)header.blocks_in_image * header.block_size) { | |
5b7aa9b5 PB |
465 | error_setg(errp, "unsupported VDI image (disk size %" PRIu64 ", " |
466 | "image bitmap has room for %" PRIu64 ")", | |
467 | header.disk_size, | |
468 | (uint64_t)header.blocks_in_image * header.block_size); | |
8937f822 | 469 | ret = -ENOTSUP; |
9aebd98a SW |
470 | goto fail; |
471 | } else if (!uuid_is_null(header.uuid_link)) { | |
5b7aa9b5 | 472 | error_setg(errp, "unsupported VDI image (non-NULL link UUID)"); |
8937f822 | 473 | ret = -ENOTSUP; |
9aebd98a SW |
474 | goto fail; |
475 | } else if (!uuid_is_null(header.uuid_parent)) { | |
5b7aa9b5 | 476 | error_setg(errp, "unsupported VDI image (non-NULL parent UUID)"); |
8937f822 | 477 | ret = -ENOTSUP; |
9aebd98a | 478 | goto fail; |
63fa06dc JC |
479 | } else if (header.blocks_in_image > VDI_BLOCKS_IN_IMAGE_MAX) { |
480 | error_setg(errp, "unsupported VDI image " | |
481 | "(too many blocks %u, max is %u)", | |
482 | header.blocks_in_image, VDI_BLOCKS_IN_IMAGE_MAX); | |
483 | ret = -ENOTSUP; | |
484 | goto fail; | |
9aebd98a SW |
485 | } |
486 | ||
487 | bs->total_sectors = header.disk_size / SECTOR_SIZE; | |
488 | ||
489 | s->block_size = header.block_size; | |
490 | s->block_sectors = header.block_size / SECTOR_SIZE; | |
491 | s->bmap_sector = header.offset_bmap / SECTOR_SIZE; | |
492 | s->header = header; | |
493 | ||
494 | bmap_size = header.blocks_in_image * sizeof(uint32_t); | |
e9082e47 | 495 | bmap_size = DIV_ROUND_UP(bmap_size, SECTOR_SIZE); |
9a4f4c31 | 496 | s->bmap = qemu_try_blockalign(bs->file->bs, bmap_size * SECTOR_SIZE); |
17cce735 KW |
497 | if (s->bmap == NULL) { |
498 | ret = -ENOMEM; | |
499 | goto fail; | |
500 | } | |
501 | ||
9a4f4c31 KW |
502 | ret = bdrv_read(bs->file->bs, s->bmap_sector, (uint8_t *)s->bmap, |
503 | bmap_size); | |
8937f822 | 504 | if (ret < 0) { |
9aebd98a SW |
505 | goto fail_free_bmap; |
506 | } | |
507 | ||
fc9d106c | 508 | /* Disable migration when vdi images are used */ |
81e5f78a AG |
509 | error_setg(&s->migration_blocker, "The vdi format used by node '%s' " |
510 | "does not support live migration", | |
511 | bdrv_get_device_or_node_name(bs)); | |
fc9d106c KW |
512 | migrate_add_blocker(s->migration_blocker); |
513 | ||
f0ab6f10 HR |
514 | qemu_co_mutex_init(&s->write_lock); |
515 | ||
9aebd98a SW |
516 | return 0; |
517 | ||
518 | fail_free_bmap: | |
17cce735 | 519 | qemu_vfree(s->bmap); |
9aebd98a SW |
520 | |
521 | fail: | |
8937f822 | 522 | return ret; |
9aebd98a SW |
523 | } |
524 | ||
ecfe2bba JC |
525 | static int vdi_reopen_prepare(BDRVReopenState *state, |
526 | BlockReopenQueue *queue, Error **errp) | |
527 | { | |
528 | return 0; | |
529 | } | |
530 | ||
b6b8a333 | 531 | static int64_t coroutine_fn vdi_co_get_block_status(BlockDriverState *bs, |
67a0fd2a | 532 | int64_t sector_num, int nb_sectors, int *pnum, BlockDriverState **file) |
9aebd98a SW |
533 | { |
534 | /* TODO: Check for too large sector_num (in bdrv_is_allocated or here). */ | |
535 | BDRVVdiState *s = (BDRVVdiState *)bs->opaque; | |
536 | size_t bmap_index = sector_num / s->block_sectors; | |
537 | size_t sector_in_block = sector_num % s->block_sectors; | |
538 | int n_sectors = s->block_sectors - sector_in_block; | |
539 | uint32_t bmap_entry = le32_to_cpu(s->bmap[bmap_index]); | |
4bc74be9 PB |
540 | uint64_t offset; |
541 | int result; | |
542 | ||
9aebd98a SW |
543 | logout("%p, %" PRId64 ", %d, %p\n", bs, sector_num, nb_sectors, pnum); |
544 | if (n_sectors > nb_sectors) { | |
545 | n_sectors = nb_sectors; | |
546 | } | |
547 | *pnum = n_sectors; | |
4bc74be9 PB |
548 | result = VDI_IS_ALLOCATED(bmap_entry); |
549 | if (!result) { | |
550 | return 0; | |
551 | } | |
552 | ||
553 | offset = s->header.offset_data + | |
554 | (uint64_t)bmap_entry * s->block_size + | |
555 | sector_in_block * SECTOR_SIZE; | |
8bfb1371 | 556 | *file = bs->file->bs; |
4bc74be9 | 557 | return BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID | offset; |
9aebd98a SW |
558 | } |
559 | ||
a7a43aa1 PB |
560 | static int vdi_co_read(BlockDriverState *bs, |
561 | int64_t sector_num, uint8_t *buf, int nb_sectors) | |
9aebd98a | 562 | { |
9aebd98a SW |
563 | BDRVVdiState *s = bs->opaque; |
564 | uint32_t bmap_entry; | |
565 | uint32_t block_index; | |
566 | uint32_t sector_in_block; | |
567 | uint32_t n_sectors; | |
eb9566d1 | 568 | int ret = 0; |
4de659e8 PB |
569 | |
570 | logout("\n"); | |
9aebd98a | 571 | |
eb9566d1 PB |
572 | while (ret >= 0 && nb_sectors > 0) { |
573 | block_index = sector_num / s->block_sectors; | |
574 | sector_in_block = sector_num % s->block_sectors; | |
575 | n_sectors = s->block_sectors - sector_in_block; | |
576 | if (n_sectors > nb_sectors) { | |
577 | n_sectors = nb_sectors; | |
578 | } | |
0c7bfc32 | 579 | |
eb9566d1 PB |
580 | logout("will read %u sectors starting at sector %" PRIu64 "\n", |
581 | n_sectors, sector_num); | |
582 | ||
583 | /* prepare next AIO request */ | |
584 | bmap_entry = le32_to_cpu(s->bmap[block_index]); | |
585 | if (!VDI_IS_ALLOCATED(bmap_entry)) { | |
586 | /* Block not allocated, return zeros, no need to wait. */ | |
587 | memset(buf, 0, n_sectors * SECTOR_SIZE); | |
588 | ret = 0; | |
589 | } else { | |
590 | uint64_t offset = s->header.offset_data / SECTOR_SIZE + | |
591 | (uint64_t)bmap_entry * s->block_sectors + | |
592 | sector_in_block; | |
9a4f4c31 | 593 | ret = bdrv_read(bs->file->bs, offset, buf, n_sectors); |
eb9566d1 PB |
594 | } |
595 | logout("%u sectors read\n", n_sectors); | |
0c7bfc32 | 596 | |
eb9566d1 PB |
597 | nb_sectors -= n_sectors; |
598 | sector_num += n_sectors; | |
599 | buf += n_sectors * SECTOR_SIZE; | |
9aebd98a | 600 | } |
3d46a75a | 601 | |
3d46a75a | 602 | return ret; |
9aebd98a SW |
603 | } |
604 | ||
a7a43aa1 PB |
605 | static int vdi_co_write(BlockDriverState *bs, |
606 | int64_t sector_num, const uint8_t *buf, int nb_sectors) | |
9aebd98a | 607 | { |
9aebd98a SW |
608 | BDRVVdiState *s = bs->opaque; |
609 | uint32_t bmap_entry; | |
610 | uint32_t block_index; | |
611 | uint32_t sector_in_block; | |
612 | uint32_t n_sectors; | |
bfc45fc1 PB |
613 | uint32_t bmap_first = VDI_UNALLOCATED; |
614 | uint32_t bmap_last = VDI_UNALLOCATED; | |
bfc45fc1 | 615 | uint8_t *block = NULL; |
eb9566d1 | 616 | int ret = 0; |
4de659e8 PB |
617 | |
618 | logout("\n"); | |
9aebd98a | 619 | |
eb9566d1 PB |
620 | while (ret >= 0 && nb_sectors > 0) { |
621 | block_index = sector_num / s->block_sectors; | |
622 | sector_in_block = sector_num % s->block_sectors; | |
623 | n_sectors = s->block_sectors - sector_in_block; | |
624 | if (n_sectors > nb_sectors) { | |
625 | n_sectors = nb_sectors; | |
626 | } | |
9aebd98a | 627 | |
eb9566d1 PB |
628 | logout("will write %u sectors starting at sector %" PRIu64 "\n", |
629 | n_sectors, sector_num); | |
630 | ||
631 | /* prepare next AIO request */ | |
632 | bmap_entry = le32_to_cpu(s->bmap[block_index]); | |
633 | if (!VDI_IS_ALLOCATED(bmap_entry)) { | |
634 | /* Allocate new block and write to it. */ | |
635 | uint64_t offset; | |
636 | bmap_entry = s->header.blocks_allocated; | |
637 | s->bmap[block_index] = cpu_to_le32(bmap_entry); | |
638 | s->header.blocks_allocated++; | |
639 | offset = s->header.offset_data / SECTOR_SIZE + | |
640 | (uint64_t)bmap_entry * s->block_sectors; | |
641 | if (block == NULL) { | |
642 | block = g_malloc(s->block_size); | |
643 | bmap_first = block_index; | |
644 | } | |
645 | bmap_last = block_index; | |
646 | /* Copy data to be written to new block and zero unused parts. */ | |
647 | memset(block, 0, sector_in_block * SECTOR_SIZE); | |
648 | memcpy(block + sector_in_block * SECTOR_SIZE, | |
649 | buf, n_sectors * SECTOR_SIZE); | |
650 | memset(block + (sector_in_block + n_sectors) * SECTOR_SIZE, 0, | |
651 | (s->block_sectors - n_sectors - sector_in_block) * SECTOR_SIZE); | |
f0ab6f10 HR |
652 | |
653 | /* Note that this coroutine does not yield anywhere from reading the | |
654 | * bmap entry until here, so in regards to all the coroutines trying | |
655 | * to write to this cluster, the one doing the allocation will | |
656 | * always be the first to try to acquire the lock. | |
657 | * Therefore, it is also the first that will actually be able to | |
658 | * acquire the lock and thus the padded cluster is written before | |
659 | * the other coroutines can write to the affected area. */ | |
660 | qemu_co_mutex_lock(&s->write_lock); | |
9a4f4c31 | 661 | ret = bdrv_write(bs->file->bs, offset, block, s->block_sectors); |
f0ab6f10 | 662 | qemu_co_mutex_unlock(&s->write_lock); |
eb9566d1 PB |
663 | } else { |
664 | uint64_t offset = s->header.offset_data / SECTOR_SIZE + | |
665 | (uint64_t)bmap_entry * s->block_sectors + | |
666 | sector_in_block; | |
f0ab6f10 HR |
667 | qemu_co_mutex_lock(&s->write_lock); |
668 | /* This lock is only used to make sure the following write operation | |
669 | * is executed after the write issued by the coroutine allocating | |
670 | * this cluster, therefore we do not need to keep it locked. | |
671 | * As stated above, the allocating coroutine will always try to lock | |
672 | * the mutex before all the other concurrent accesses to that | |
673 | * cluster, therefore at this point we can be absolutely certain | |
674 | * that that write operation has returned (there may be other writes | |
675 | * in flight, but they do not concern this very operation). */ | |
676 | qemu_co_mutex_unlock(&s->write_lock); | |
9a4f4c31 | 677 | ret = bdrv_write(bs->file->bs, offset, buf, n_sectors); |
9aebd98a | 678 | } |
0c7bfc32 | 679 | |
eb9566d1 PB |
680 | nb_sectors -= n_sectors; |
681 | sector_num += n_sectors; | |
682 | buf += n_sectors * SECTOR_SIZE; | |
0c7bfc32 | 683 | |
eb9566d1 | 684 | logout("%u sectors written\n", n_sectors); |
9aebd98a | 685 | } |
9aebd98a | 686 | |
0c7bfc32 | 687 | logout("finished data write\n"); |
4eea78e6 PB |
688 | if (ret < 0) { |
689 | return ret; | |
690 | } | |
691 | ||
692 | if (block) { | |
693 | /* One or more new blocks were allocated. */ | |
694 | VdiHeader *header = (VdiHeader *) block; | |
695 | uint8_t *base; | |
696 | uint64_t offset; | |
697 | ||
698 | logout("now writing modified header\n"); | |
699 | assert(VDI_IS_ALLOCATED(bmap_first)); | |
700 | *header = s->header; | |
701 | vdi_header_to_le(header); | |
9a4f4c31 | 702 | ret = bdrv_write(bs->file->bs, 0, block, 1); |
bfc45fc1 PB |
703 | g_free(block); |
704 | block = NULL; | |
4eea78e6 PB |
705 | |
706 | if (ret < 0) { | |
707 | return ret; | |
0c7bfc32 | 708 | } |
4eea78e6 PB |
709 | |
710 | logout("now writing modified block map entry %u...%u\n", | |
711 | bmap_first, bmap_last); | |
712 | /* Write modified sectors from block map. */ | |
713 | bmap_first /= (SECTOR_SIZE / sizeof(uint32_t)); | |
714 | bmap_last /= (SECTOR_SIZE / sizeof(uint32_t)); | |
715 | n_sectors = bmap_last - bmap_first + 1; | |
716 | offset = s->bmap_sector + bmap_first; | |
717 | base = ((uint8_t *)&s->bmap[0]) + bmap_first * SECTOR_SIZE; | |
718 | logout("will write %u block map sectors starting from entry %u\n", | |
719 | n_sectors, bmap_first); | |
9a4f4c31 | 720 | ret = bdrv_write(bs->file->bs, offset, base, n_sectors); |
0c7bfc32 PB |
721 | } |
722 | ||
3d46a75a | 723 | return ret; |
9aebd98a SW |
724 | } |
725 | ||
004b7f25 | 726 | static int vdi_create(const char *filename, QemuOpts *opts, Error **errp) |
9aebd98a | 727 | { |
dddc7750 | 728 | int ret = 0; |
9aebd98a SW |
729 | uint64_t bytes = 0; |
730 | uint32_t blocks; | |
99cce9fa | 731 | size_t block_size = DEFAULT_CLUSTER_SIZE; |
9aebd98a SW |
732 | uint32_t image_type = VDI_TYPE_DYNAMIC; |
733 | VdiHeader header; | |
734 | size_t i; | |
735 | size_t bmap_size; | |
70747862 JC |
736 | int64_t offset = 0; |
737 | Error *local_err = NULL; | |
a08f0c3b | 738 | BlockBackend *blk = NULL; |
70747862 | 739 | uint32_t *bmap = NULL; |
9aebd98a SW |
740 | |
741 | logout("\n"); | |
742 | ||
743 | /* Read out options. */ | |
c2eb918e HT |
744 | bytes = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0), |
745 | BDRV_SECTOR_SIZE); | |
9aebd98a | 746 | #if defined(CONFIG_VDI_BLOCK_SIZE) |
004b7f25 CL |
747 | /* TODO: Additional checks (SECTOR_SIZE * 2^n, ...). */ |
748 | block_size = qemu_opt_get_size_del(opts, | |
749 | BLOCK_OPT_CLUSTER_SIZE, | |
750 | DEFAULT_CLUSTER_SIZE); | |
9aebd98a SW |
751 | #endif |
752 | #if defined(CONFIG_VDI_STATIC_IMAGE) | |
004b7f25 CL |
753 | if (qemu_opt_get_bool_del(opts, BLOCK_OPT_STATIC, false)) { |
754 | image_type = VDI_TYPE_STATIC; | |
9aebd98a | 755 | } |
004b7f25 | 756 | #endif |
9aebd98a | 757 | |
63fa06dc | 758 | if (bytes > VDI_DISK_SIZE_MAX) { |
dddc7750 | 759 | ret = -ENOTSUP; |
63fa06dc JC |
760 | error_setg(errp, "Unsupported VDI image size (size is 0x%" PRIx64 |
761 | ", max supported is 0x%" PRIx64 ")", | |
762 | bytes, VDI_DISK_SIZE_MAX); | |
763 | goto exit; | |
764 | } | |
765 | ||
dddc7750 JC |
766 | ret = bdrv_create_file(filename, opts, &local_err); |
767 | if (ret < 0) { | |
70747862 | 768 | error_propagate(errp, local_err); |
63fa06dc | 769 | goto exit; |
9aebd98a | 770 | } |
a08f0c3b | 771 | |
efaa7c4e | 772 | blk = blk_new_open(filename, NULL, NULL, |
a08f0c3b KW |
773 | BDRV_O_RDWR | BDRV_O_CACHE_WB | BDRV_O_PROTOCOL, |
774 | &local_err); | |
775 | if (blk == NULL) { | |
70747862 | 776 | error_propagate(errp, local_err); |
a08f0c3b | 777 | ret = -EIO; |
70747862 | 778 | goto exit; |
4ab15590 CL |
779 | } |
780 | ||
a08f0c3b KW |
781 | blk_set_allow_write_beyond_eof(blk, true); |
782 | ||
f21dc3a4 SW |
783 | /* We need enough blocks to store the given disk size, |
784 | so always round up. */ | |
e9082e47 | 785 | blocks = DIV_ROUND_UP(bytes, block_size); |
f21dc3a4 | 786 | |
9aebd98a | 787 | bmap_size = blocks * sizeof(uint32_t); |
e9082e47 | 788 | bmap_size = ROUND_UP(bmap_size, SECTOR_SIZE); |
9aebd98a SW |
789 | |
790 | memset(&header, 0, sizeof(header)); | |
1786dc15 | 791 | pstrcpy(header.text, sizeof(header.text), VDI_TEXT); |
9aebd98a SW |
792 | header.signature = VDI_SIGNATURE; |
793 | header.version = VDI_VERSION_1_1; | |
794 | header.header_size = 0x180; | |
795 | header.image_type = image_type; | |
796 | header.offset_bmap = 0x200; | |
797 | header.offset_data = 0x200 + bmap_size; | |
798 | header.sector_size = SECTOR_SIZE; | |
799 | header.disk_size = bytes; | |
800 | header.block_size = block_size; | |
801 | header.blocks_in_image = blocks; | |
6eea90eb SW |
802 | if (image_type == VDI_TYPE_STATIC) { |
803 | header.blocks_allocated = blocks; | |
804 | } | |
9aebd98a SW |
805 | uuid_generate(header.uuid_image); |
806 | uuid_generate(header.uuid_last_snap); | |
807 | /* There is no need to set header.uuid_link or header.uuid_parent here. */ | |
808 | #if defined(CONFIG_VDI_DEBUG) | |
809 | vdi_header_print(&header); | |
810 | #endif | |
811 | vdi_header_to_le(&header); | |
a08f0c3b | 812 | ret = blk_pwrite(blk, offset, &header, sizeof(header)); |
dddc7750 | 813 | if (ret < 0) { |
70747862 JC |
814 | error_setg(errp, "Error writing header to %s", filename); |
815 | goto exit; | |
9aebd98a | 816 | } |
70747862 | 817 | offset += sizeof(header); |
9aebd98a | 818 | |
b76b6e95 | 819 | if (bmap_size > 0) { |
17cce735 KW |
820 | bmap = g_try_malloc0(bmap_size); |
821 | if (bmap == NULL) { | |
822 | ret = -ENOMEM; | |
823 | error_setg(errp, "Could not allocate bmap"); | |
824 | goto exit; | |
825 | } | |
514f21a5 SW |
826 | for (i = 0; i < blocks; i++) { |
827 | if (image_type == VDI_TYPE_STATIC) { | |
828 | bmap[i] = i; | |
829 | } else { | |
830 | bmap[i] = VDI_UNALLOCATED; | |
831 | } | |
9aebd98a | 832 | } |
a08f0c3b | 833 | ret = blk_pwrite(blk, offset, bmap, bmap_size); |
dddc7750 | 834 | if (ret < 0) { |
70747862 JC |
835 | error_setg(errp, "Error writing bmap to %s", filename); |
836 | goto exit; | |
514f21a5 | 837 | } |
70747862 | 838 | offset += bmap_size; |
9aebd98a | 839 | } |
514f21a5 | 840 | |
9aebd98a | 841 | if (image_type == VDI_TYPE_STATIC) { |
a08f0c3b | 842 | ret = blk_truncate(blk, offset + blocks * block_size); |
dddc7750 | 843 | if (ret < 0) { |
70747862 JC |
844 | error_setg(errp, "Failed to statically allocate %s", filename); |
845 | goto exit; | |
9aebd98a SW |
846 | } |
847 | } | |
848 | ||
63fa06dc | 849 | exit: |
a08f0c3b | 850 | blk_unref(blk); |
70747862 | 851 | g_free(bmap); |
dddc7750 | 852 | return ret; |
9aebd98a SW |
853 | } |
854 | ||
855 | static void vdi_close(BlockDriverState *bs) | |
856 | { | |
fc9d106c | 857 | BDRVVdiState *s = bs->opaque; |
6ac5f388 | 858 | |
17cce735 | 859 | qemu_vfree(s->bmap); |
6ac5f388 | 860 | |
fc9d106c KW |
861 | migrate_del_blocker(s->migration_blocker); |
862 | error_free(s->migration_blocker); | |
9aebd98a SW |
863 | } |
864 | ||
004b7f25 CL |
865 | static QemuOptsList vdi_create_opts = { |
866 | .name = "vdi-create-opts", | |
867 | .head = QTAILQ_HEAD_INITIALIZER(vdi_create_opts.head), | |
868 | .desc = { | |
869 | { | |
870 | .name = BLOCK_OPT_SIZE, | |
871 | .type = QEMU_OPT_SIZE, | |
872 | .help = "Virtual disk size" | |
873 | }, | |
9aebd98a | 874 | #if defined(CONFIG_VDI_BLOCK_SIZE) |
004b7f25 CL |
875 | { |
876 | .name = BLOCK_OPT_CLUSTER_SIZE, | |
877 | .type = QEMU_OPT_SIZE, | |
878 | .help = "VDI cluster (block) size", | |
879 | .def_value_str = stringify(DEFAULT_CLUSTER_SIZE) | |
880 | }, | |
9aebd98a SW |
881 | #endif |
882 | #if defined(CONFIG_VDI_STATIC_IMAGE) | |
004b7f25 CL |
883 | { |
884 | .name = BLOCK_OPT_STATIC, | |
885 | .type = QEMU_OPT_BOOL, | |
886 | .help = "VDI static (pre-allocated) image", | |
887 | .def_value_str = "off" | |
888 | }, | |
9aebd98a | 889 | #endif |
004b7f25 CL |
890 | /* TODO: An additional option to set UUID values might be useful. */ |
891 | { /* end of list */ } | |
892 | } | |
9aebd98a SW |
893 | }; |
894 | ||
895 | static BlockDriver bdrv_vdi = { | |
896 | .format_name = "vdi", | |
897 | .instance_size = sizeof(BDRVVdiState), | |
898 | .bdrv_probe = vdi_probe, | |
899 | .bdrv_open = vdi_open, | |
900 | .bdrv_close = vdi_close, | |
ecfe2bba | 901 | .bdrv_reopen_prepare = vdi_reopen_prepare, |
c282e1fd | 902 | .bdrv_create = vdi_create, |
3ac21627 | 903 | .bdrv_has_zero_init = bdrv_has_zero_init_1, |
b6b8a333 | 904 | .bdrv_co_get_block_status = vdi_co_get_block_status, |
9aebd98a SW |
905 | .bdrv_make_empty = vdi_make_empty, |
906 | ||
a7a43aa1 | 907 | .bdrv_read = vdi_co_read, |
9aebd98a | 908 | #if defined(CONFIG_VDI_WRITE) |
a7a43aa1 | 909 | .bdrv_write = vdi_co_write, |
9aebd98a SW |
910 | #endif |
911 | ||
912 | .bdrv_get_info = vdi_get_info, | |
913 | ||
004b7f25 | 914 | .create_opts = &vdi_create_opts, |
9aebd98a SW |
915 | .bdrv_check = vdi_check, |
916 | }; | |
917 | ||
918 | static void bdrv_vdi_init(void) | |
919 | { | |
920 | logout("\n"); | |
921 | bdrv_register(&bdrv_vdi); | |
922 | } | |
923 | ||
924 | block_init(bdrv_vdi_init); |