]>
Commit | Line | Data |
---|---|---|
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" |
737e150e | 54 | #include "block/block_int.h" |
a08f0c3b | 55 | #include "sysemu/block-backend.h" |
1de7afc9 | 56 | #include "qemu/module.h" |
922a01a0 | 57 | #include "qemu/option.h" |
58369e22 | 58 | #include "qemu/bswap.h" |
795c40b8 | 59 | #include "migration/blocker.h" |
10817bf0 | 60 | #include "qemu/coroutine.h" |
f348b6d1 | 61 | #include "qemu/cutils.h" |
7c6f55b6 | 62 | #include "qemu/uuid.h" |
9aebd98a SW |
63 | |
64 | /* Code configuration options. */ | |
65 | ||
66 | /* Enable debug messages. */ | |
67 | //~ #define CONFIG_VDI_DEBUG | |
68 | ||
69 | /* Support write operations on VDI images. */ | |
70 | #define CONFIG_VDI_WRITE | |
71 | ||
72 | /* Support non-standard block (cluster) size. This is untested. | |
73 | * Maybe it will be needed for very large images. | |
74 | */ | |
75 | //~ #define CONFIG_VDI_BLOCK_SIZE | |
76 | ||
77 | /* Support static (fixed, pre-allocated) images. */ | |
78 | #define CONFIG_VDI_STATIC_IMAGE | |
79 | ||
80 | /* Command line option for static images. */ | |
81 | #define BLOCK_OPT_STATIC "static" | |
82 | ||
83 | #define KiB 1024 | |
84 | #define MiB (KiB * KiB) | |
85 | ||
86 | #define SECTOR_SIZE 512 | |
99cce9fa | 87 | #define DEFAULT_CLUSTER_SIZE (1 * MiB) |
9aebd98a SW |
88 | |
89 | #if defined(CONFIG_VDI_DEBUG) | |
b80666bf | 90 | #define VDI_DEBUG 1 |
9aebd98a | 91 | #else |
b80666bf | 92 | #define VDI_DEBUG 0 |
9aebd98a SW |
93 | #endif |
94 | ||
b80666bf EB |
95 | #define logout(fmt, ...) \ |
96 | do { \ | |
97 | if (VDI_DEBUG) { \ | |
98 | fprintf(stderr, "vdi\t%-24s" fmt, __func__, ##__VA_ARGS__); \ | |
99 | } \ | |
100 | } while (0) | |
101 | ||
9aebd98a SW |
102 | /* Image signature. */ |
103 | #define VDI_SIGNATURE 0xbeda107f | |
104 | ||
105 | /* Image version. */ | |
106 | #define VDI_VERSION_1_1 0x00010001 | |
107 | ||
108 | /* Image type. */ | |
109 | #define VDI_TYPE_DYNAMIC 1 | |
110 | #define VDI_TYPE_STATIC 2 | |
111 | ||
112 | /* Innotek / SUN images use these strings in header.text: | |
113 | * "<<< innotek VirtualBox Disk Image >>>\n" | |
114 | * "<<< Sun xVM VirtualBox Disk Image >>>\n" | |
115 | * "<<< Sun VirtualBox Disk Image >>>\n" | |
116 | * The value does not matter, so QEMU created images use a different text. | |
117 | */ | |
118 | #define VDI_TEXT "<<< QEMU VM Virtual Disk Image >>>\n" | |
119 | ||
c794b4e0 ES |
120 | /* A never-allocated block; semantically arbitrary content. */ |
121 | #define VDI_UNALLOCATED 0xffffffffU | |
122 | ||
123 | /* A discarded (no longer allocated) block; semantically zero-filled. */ | |
124 | #define VDI_DISCARDED 0xfffffffeU | |
125 | ||
126 | #define VDI_IS_ALLOCATED(X) ((X) < VDI_DISCARDED) | |
9aebd98a | 127 | |
d20418ee HR |
128 | /* The bmap will take up VDI_BLOCKS_IN_IMAGE_MAX * sizeof(uint32_t) bytes; since |
129 | * the bmap is read and written in a single operation, its size needs to be | |
130 | * limited to INT_MAX; furthermore, when opening an image, the bmap size is | |
131 | * rounded up to be aligned on BDRV_SECTOR_SIZE. | |
132 | * Therefore this should satisfy the following: | |
133 | * VDI_BLOCKS_IN_IMAGE_MAX * sizeof(uint32_t) + BDRV_SECTOR_SIZE == INT_MAX + 1 | |
134 | * (INT_MAX + 1 is the first value not representable as an int) | |
135 | * This guarantees that any value below or equal to the constant will, when | |
136 | * multiplied by sizeof(uint32_t) and rounded up to a BDRV_SECTOR_SIZE boundary, | |
137 | * still be below or equal to INT_MAX. */ | |
138 | #define VDI_BLOCKS_IN_IMAGE_MAX \ | |
139 | ((unsigned)((INT_MAX + 1u - BDRV_SECTOR_SIZE) / sizeof(uint32_t))) | |
63fa06dc JC |
140 | #define VDI_DISK_SIZE_MAX ((uint64_t)VDI_BLOCKS_IN_IMAGE_MAX * \ |
141 | (uint64_t)DEFAULT_CLUSTER_SIZE) | |
142 | ||
9aebd98a SW |
143 | typedef struct { |
144 | char text[0x40]; | |
145 | uint32_t signature; | |
146 | uint32_t version; | |
147 | uint32_t header_size; | |
148 | uint32_t image_type; | |
149 | uint32_t image_flags; | |
150 | char description[256]; | |
151 | uint32_t offset_bmap; | |
152 | uint32_t offset_data; | |
153 | uint32_t cylinders; /* disk geometry, unused here */ | |
154 | uint32_t heads; /* disk geometry, unused here */ | |
155 | uint32_t sectors; /* disk geometry, unused here */ | |
156 | uint32_t sector_size; | |
157 | uint32_t unused1; | |
158 | uint64_t disk_size; | |
159 | uint32_t block_size; | |
160 | uint32_t block_extra; /* unused here */ | |
161 | uint32_t blocks_in_image; | |
162 | uint32_t blocks_allocated; | |
7c6f55b6 FZ |
163 | QemuUUID uuid_image; |
164 | QemuUUID uuid_last_snap; | |
165 | QemuUUID uuid_link; | |
166 | QemuUUID uuid_parent; | |
9aebd98a | 167 | uint64_t unused2[7]; |
8368febd | 168 | } QEMU_PACKED VdiHeader; |
9aebd98a SW |
169 | |
170 | typedef struct { | |
9aebd98a SW |
171 | /* The block map entries are little endian (even in memory). */ |
172 | uint32_t *bmap; | |
173 | /* Size of block (bytes). */ | |
174 | uint32_t block_size; | |
9aebd98a SW |
175 | /* First sector of block map. */ |
176 | uint32_t bmap_sector; | |
4ff9786c | 177 | /* VDI header (converted to host endianness). */ |
9aebd98a | 178 | VdiHeader header; |
fc9d106c | 179 | |
1e886639 | 180 | CoRwlock bmap_lock; |
f0ab6f10 | 181 | |
fc9d106c | 182 | Error *migration_blocker; |
9aebd98a SW |
183 | } BDRVVdiState; |
184 | ||
9aebd98a SW |
185 | static void vdi_header_to_cpu(VdiHeader *header) |
186 | { | |
187 | le32_to_cpus(&header->signature); | |
188 | le32_to_cpus(&header->version); | |
189 | le32_to_cpus(&header->header_size); | |
190 | le32_to_cpus(&header->image_type); | |
191 | le32_to_cpus(&header->image_flags); | |
192 | le32_to_cpus(&header->offset_bmap); | |
193 | le32_to_cpus(&header->offset_data); | |
194 | le32_to_cpus(&header->cylinders); | |
195 | le32_to_cpus(&header->heads); | |
196 | le32_to_cpus(&header->sectors); | |
197 | le32_to_cpus(&header->sector_size); | |
198 | le64_to_cpus(&header->disk_size); | |
199 | le32_to_cpus(&header->block_size); | |
200 | le32_to_cpus(&header->block_extra); | |
201 | le32_to_cpus(&header->blocks_in_image); | |
202 | le32_to_cpus(&header->blocks_allocated); | |
7c6f55b6 FZ |
203 | qemu_uuid_bswap(&header->uuid_image); |
204 | qemu_uuid_bswap(&header->uuid_last_snap); | |
205 | qemu_uuid_bswap(&header->uuid_link); | |
206 | qemu_uuid_bswap(&header->uuid_parent); | |
9aebd98a SW |
207 | } |
208 | ||
209 | static void vdi_header_to_le(VdiHeader *header) | |
210 | { | |
211 | cpu_to_le32s(&header->signature); | |
212 | cpu_to_le32s(&header->version); | |
213 | cpu_to_le32s(&header->header_size); | |
214 | cpu_to_le32s(&header->image_type); | |
215 | cpu_to_le32s(&header->image_flags); | |
216 | cpu_to_le32s(&header->offset_bmap); | |
217 | cpu_to_le32s(&header->offset_data); | |
218 | cpu_to_le32s(&header->cylinders); | |
219 | cpu_to_le32s(&header->heads); | |
220 | cpu_to_le32s(&header->sectors); | |
221 | cpu_to_le32s(&header->sector_size); | |
222 | cpu_to_le64s(&header->disk_size); | |
223 | cpu_to_le32s(&header->block_size); | |
224 | cpu_to_le32s(&header->block_extra); | |
225 | cpu_to_le32s(&header->blocks_in_image); | |
226 | cpu_to_le32s(&header->blocks_allocated); | |
7c6f55b6 FZ |
227 | qemu_uuid_bswap(&header->uuid_image); |
228 | qemu_uuid_bswap(&header->uuid_last_snap); | |
229 | qemu_uuid_bswap(&header->uuid_link); | |
230 | qemu_uuid_bswap(&header->uuid_parent); | |
9aebd98a SW |
231 | } |
232 | ||
233 | #if defined(CONFIG_VDI_DEBUG) | |
234 | static void vdi_header_print(VdiHeader *header) | |
235 | { | |
236 | char uuid[37]; | |
237 | logout("text %s", header->text); | |
9f0470bb | 238 | logout("signature 0x%08x\n", header->signature); |
9aebd98a SW |
239 | logout("header size 0x%04x\n", header->header_size); |
240 | logout("image type 0x%04x\n", header->image_type); | |
241 | logout("image flags 0x%04x\n", header->image_flags); | |
242 | logout("description %s\n", header->description); | |
243 | logout("offset bmap 0x%04x\n", header->offset_bmap); | |
244 | logout("offset data 0x%04x\n", header->offset_data); | |
245 | logout("cylinders 0x%04x\n", header->cylinders); | |
246 | logout("heads 0x%04x\n", header->heads); | |
247 | logout("sectors 0x%04x\n", header->sectors); | |
248 | logout("sector size 0x%04x\n", header->sector_size); | |
249 | logout("image size 0x%" PRIx64 " B (%" PRIu64 " MiB)\n", | |
250 | header->disk_size, header->disk_size / MiB); | |
251 | logout("block size 0x%04x\n", header->block_size); | |
252 | logout("block extra 0x%04x\n", header->block_extra); | |
253 | logout("blocks tot. 0x%04x\n", header->blocks_in_image); | |
254 | logout("blocks all. 0x%04x\n", header->blocks_allocated); | |
255 | uuid_unparse(header->uuid_image, uuid); | |
256 | logout("uuid image %s\n", uuid); | |
257 | uuid_unparse(header->uuid_last_snap, uuid); | |
258 | logout("uuid snap %s\n", uuid); | |
259 | uuid_unparse(header->uuid_link, uuid); | |
260 | logout("uuid link %s\n", uuid); | |
261 | uuid_unparse(header->uuid_parent, uuid); | |
262 | logout("uuid parent %s\n", uuid); | |
263 | } | |
264 | #endif | |
265 | ||
4534ff54 KW |
266 | static int vdi_check(BlockDriverState *bs, BdrvCheckResult *res, |
267 | BdrvCheckMode fix) | |
9aebd98a SW |
268 | { |
269 | /* TODO: additional checks possible. */ | |
270 | BDRVVdiState *s = (BDRVVdiState *)bs->opaque; | |
9aebd98a SW |
271 | uint32_t blocks_allocated = 0; |
272 | uint32_t block; | |
273 | uint32_t *bmap; | |
274 | logout("\n"); | |
275 | ||
4534ff54 KW |
276 | if (fix) { |
277 | return -ENOTSUP; | |
278 | } | |
279 | ||
5839e53b | 280 | bmap = g_try_new(uint32_t, s->header.blocks_in_image); |
17cce735 KW |
281 | if (s->header.blocks_in_image && bmap == NULL) { |
282 | res->check_errors++; | |
283 | return -ENOMEM; | |
284 | } | |
285 | ||
9aebd98a SW |
286 | memset(bmap, 0xff, s->header.blocks_in_image * sizeof(uint32_t)); |
287 | ||
288 | /* Check block map and value of blocks_allocated. */ | |
289 | for (block = 0; block < s->header.blocks_in_image; block++) { | |
290 | uint32_t bmap_entry = le32_to_cpu(s->bmap[block]); | |
c794b4e0 | 291 | if (VDI_IS_ALLOCATED(bmap_entry)) { |
9aebd98a SW |
292 | if (bmap_entry < s->header.blocks_in_image) { |
293 | blocks_allocated++; | |
c794b4e0 | 294 | if (!VDI_IS_ALLOCATED(bmap[bmap_entry])) { |
9aebd98a SW |
295 | bmap[bmap_entry] = bmap_entry; |
296 | } else { | |
297 | fprintf(stderr, "ERROR: block index %" PRIu32 | |
298 | " also used by %" PRIu32 "\n", bmap[bmap_entry], bmap_entry); | |
9ac228e0 | 299 | res->corruptions++; |
9aebd98a SW |
300 | } |
301 | } else { | |
302 | fprintf(stderr, "ERROR: block index %" PRIu32 | |
303 | " too large, is %" PRIu32 "\n", block, bmap_entry); | |
9ac228e0 | 304 | res->corruptions++; |
9aebd98a SW |
305 | } |
306 | } | |
307 | } | |
308 | if (blocks_allocated != s->header.blocks_allocated) { | |
309 | fprintf(stderr, "ERROR: allocated blocks mismatch, is %" PRIu32 | |
310 | ", should be %" PRIu32 "\n", | |
311 | blocks_allocated, s->header.blocks_allocated); | |
9ac228e0 | 312 | res->corruptions++; |
9aebd98a SW |
313 | } |
314 | ||
7267c094 | 315 | g_free(bmap); |
9aebd98a | 316 | |
9ac228e0 | 317 | return 0; |
9aebd98a SW |
318 | } |
319 | ||
320 | static int vdi_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) | |
321 | { | |
322 | /* TODO: vdi_get_info would be needed for machine snapshots. | |
323 | vm_state_offset is still missing. */ | |
324 | BDRVVdiState *s = (BDRVVdiState *)bs->opaque; | |
325 | logout("\n"); | |
326 | bdi->cluster_size = s->block_size; | |
327 | bdi->vm_state_offset = 0; | |
95de6d70 | 328 | bdi->unallocated_blocks_are_zero = true; |
9aebd98a SW |
329 | return 0; |
330 | } | |
331 | ||
332 | static int vdi_make_empty(BlockDriverState *bs) | |
333 | { | |
334 | /* TODO: missing code. */ | |
335 | logout("\n"); | |
336 | /* The return value for missing code must be 0, see block.c. */ | |
337 | return 0; | |
338 | } | |
339 | ||
340 | static int vdi_probe(const uint8_t *buf, int buf_size, const char *filename) | |
341 | { | |
342 | const VdiHeader *header = (const VdiHeader *)buf; | |
dddc7750 | 343 | int ret = 0; |
9aebd98a SW |
344 | |
345 | logout("\n"); | |
346 | ||
347 | if (buf_size < sizeof(*header)) { | |
348 | /* Header too small, no VDI. */ | |
349 | } else if (le32_to_cpu(header->signature) == VDI_SIGNATURE) { | |
dddc7750 | 350 | ret = 100; |
9aebd98a SW |
351 | } |
352 | ||
dddc7750 | 353 | if (ret == 0) { |
9aebd98a SW |
354 | logout("no vdi image\n"); |
355 | } else { | |
356 | logout("%s", header->text); | |
357 | } | |
358 | ||
dddc7750 | 359 | return ret; |
9aebd98a SW |
360 | } |
361 | ||
015a1036 HR |
362 | static int vdi_open(BlockDriverState *bs, QDict *options, int flags, |
363 | Error **errp) | |
9aebd98a SW |
364 | { |
365 | BDRVVdiState *s = bs->opaque; | |
366 | VdiHeader header; | |
367 | size_t bmap_size; | |
8937f822 | 368 | int ret; |
fe44dc91 | 369 | Error *local_err = NULL; |
9aebd98a | 370 | |
4e4bf5c4 KW |
371 | bs->file = bdrv_open_child(NULL, options, "file", bs, &child_file, |
372 | false, errp); | |
373 | if (!bs->file) { | |
374 | return -EINVAL; | |
375 | } | |
376 | ||
9aebd98a SW |
377 | logout("\n"); |
378 | ||
fbcbbf4e | 379 | ret = bdrv_read(bs->file, 0, (uint8_t *)&header, 1); |
8937f822 | 380 | if (ret < 0) { |
9aebd98a SW |
381 | goto fail; |
382 | } | |
383 | ||
384 | vdi_header_to_cpu(&header); | |
385 | #if defined(CONFIG_VDI_DEBUG) | |
386 | vdi_header_print(&header); | |
387 | #endif | |
388 | ||
63fa06dc JC |
389 | if (header.disk_size > VDI_DISK_SIZE_MAX) { |
390 | error_setg(errp, "Unsupported VDI image size (size is 0x%" PRIx64 | |
391 | ", max supported is 0x%" PRIx64 ")", | |
392 | header.disk_size, VDI_DISK_SIZE_MAX); | |
393 | ret = -ENOTSUP; | |
394 | goto fail; | |
395 | } | |
396 | ||
f21dc3a4 SW |
397 | if (header.disk_size % SECTOR_SIZE != 0) { |
398 | /* 'VBoxManage convertfromraw' can create images with odd disk sizes. | |
399 | We accept them but round the disk size to the next multiple of | |
400 | SECTOR_SIZE. */ | |
401 | logout("odd disk size %" PRIu64 " B, round up\n", header.disk_size); | |
e9082e47 | 402 | header.disk_size = ROUND_UP(header.disk_size, SECTOR_SIZE); |
f21dc3a4 SW |
403 | } |
404 | ||
0e87ba2c | 405 | if (header.signature != VDI_SIGNATURE) { |
521b2b5d HR |
406 | error_setg(errp, "Image not in VDI format (bad signature %08" PRIx32 |
407 | ")", header.signature); | |
76abe407 | 408 | ret = -EINVAL; |
0e87ba2c SW |
409 | goto fail; |
410 | } else if (header.version != VDI_VERSION_1_1) { | |
521b2b5d HR |
411 | error_setg(errp, "unsupported VDI image (version %" PRIu32 ".%" PRIu32 |
412 | ")", header.version >> 16, header.version & 0xffff); | |
8937f822 | 413 | ret = -ENOTSUP; |
9aebd98a SW |
414 | goto fail; |
415 | } else if (header.offset_bmap % SECTOR_SIZE != 0) { | |
416 | /* We only support block maps which start on a sector boundary. */ | |
5b7aa9b5 | 417 | error_setg(errp, "unsupported VDI image (unaligned block map offset " |
521b2b5d | 418 | "0x%" PRIx32 ")", header.offset_bmap); |
8937f822 | 419 | ret = -ENOTSUP; |
9aebd98a SW |
420 | goto fail; |
421 | } else if (header.offset_data % SECTOR_SIZE != 0) { | |
422 | /* We only support data blocks which start on a sector boundary. */ | |
521b2b5d HR |
423 | error_setg(errp, "unsupported VDI image (unaligned data offset 0x%" |
424 | PRIx32 ")", header.offset_data); | |
8937f822 | 425 | ret = -ENOTSUP; |
9aebd98a SW |
426 | goto fail; |
427 | } else if (header.sector_size != SECTOR_SIZE) { | |
521b2b5d HR |
428 | error_setg(errp, "unsupported VDI image (sector size %" PRIu32 |
429 | " is not %u)", header.sector_size, SECTOR_SIZE); | |
8937f822 | 430 | ret = -ENOTSUP; |
9aebd98a | 431 | goto fail; |
63fa06dc | 432 | } else if (header.block_size != DEFAULT_CLUSTER_SIZE) { |
521b2b5d HR |
433 | error_setg(errp, "unsupported VDI image (block size %" PRIu32 |
434 | " is not %u)", header.block_size, DEFAULT_CLUSTER_SIZE); | |
8937f822 | 435 | ret = -ENOTSUP; |
9aebd98a | 436 | goto fail; |
f21dc3a4 SW |
437 | } else if (header.disk_size > |
438 | (uint64_t)header.blocks_in_image * header.block_size) { | |
5b7aa9b5 PB |
439 | error_setg(errp, "unsupported VDI image (disk size %" PRIu64 ", " |
440 | "image bitmap has room for %" PRIu64 ")", | |
441 | header.disk_size, | |
442 | (uint64_t)header.blocks_in_image * header.block_size); | |
8937f822 | 443 | ret = -ENOTSUP; |
9aebd98a | 444 | goto fail; |
7c6f55b6 | 445 | } else if (!qemu_uuid_is_null(&header.uuid_link)) { |
5b7aa9b5 | 446 | error_setg(errp, "unsupported VDI image (non-NULL link UUID)"); |
8937f822 | 447 | ret = -ENOTSUP; |
9aebd98a | 448 | goto fail; |
7c6f55b6 | 449 | } else if (!qemu_uuid_is_null(&header.uuid_parent)) { |
5b7aa9b5 | 450 | error_setg(errp, "unsupported VDI image (non-NULL parent UUID)"); |
8937f822 | 451 | ret = -ENOTSUP; |
9aebd98a | 452 | goto fail; |
63fa06dc JC |
453 | } else if (header.blocks_in_image > VDI_BLOCKS_IN_IMAGE_MAX) { |
454 | error_setg(errp, "unsupported VDI image " | |
455 | "(too many blocks %u, max is %u)", | |
456 | header.blocks_in_image, VDI_BLOCKS_IN_IMAGE_MAX); | |
457 | ret = -ENOTSUP; | |
458 | goto fail; | |
9aebd98a SW |
459 | } |
460 | ||
461 | bs->total_sectors = header.disk_size / SECTOR_SIZE; | |
462 | ||
463 | s->block_size = header.block_size; | |
9aebd98a SW |
464 | s->bmap_sector = header.offset_bmap / SECTOR_SIZE; |
465 | s->header = header; | |
466 | ||
467 | bmap_size = header.blocks_in_image * sizeof(uint32_t); | |
e9082e47 | 468 | bmap_size = DIV_ROUND_UP(bmap_size, SECTOR_SIZE); |
9a4f4c31 | 469 | s->bmap = qemu_try_blockalign(bs->file->bs, bmap_size * SECTOR_SIZE); |
17cce735 KW |
470 | if (s->bmap == NULL) { |
471 | ret = -ENOMEM; | |
472 | goto fail; | |
473 | } | |
474 | ||
fbcbbf4e | 475 | ret = bdrv_read(bs->file, s->bmap_sector, (uint8_t *)s->bmap, |
9a4f4c31 | 476 | bmap_size); |
8937f822 | 477 | if (ret < 0) { |
9aebd98a SW |
478 | goto fail_free_bmap; |
479 | } | |
480 | ||
fc9d106c | 481 | /* Disable migration when vdi images are used */ |
81e5f78a AG |
482 | error_setg(&s->migration_blocker, "The vdi format used by node '%s' " |
483 | "does not support live migration", | |
484 | bdrv_get_device_or_node_name(bs)); | |
fe44dc91 AA |
485 | ret = migrate_add_blocker(s->migration_blocker, &local_err); |
486 | if (local_err) { | |
487 | error_propagate(errp, local_err); | |
488 | error_free(s->migration_blocker); | |
489 | goto fail_free_bmap; | |
490 | } | |
fc9d106c | 491 | |
1e886639 | 492 | qemu_co_rwlock_init(&s->bmap_lock); |
f0ab6f10 | 493 | |
9aebd98a SW |
494 | return 0; |
495 | ||
496 | fail_free_bmap: | |
17cce735 | 497 | qemu_vfree(s->bmap); |
9aebd98a SW |
498 | |
499 | fail: | |
8937f822 | 500 | return ret; |
9aebd98a SW |
501 | } |
502 | ||
ecfe2bba JC |
503 | static int vdi_reopen_prepare(BDRVReopenState *state, |
504 | BlockReopenQueue *queue, Error **errp) | |
505 | { | |
506 | return 0; | |
507 | } | |
508 | ||
67635f6a EB |
509 | static int coroutine_fn vdi_co_block_status(BlockDriverState *bs, |
510 | bool want_zero, | |
511 | int64_t offset, int64_t bytes, | |
512 | int64_t *pnum, int64_t *map, | |
513 | BlockDriverState **file) | |
9aebd98a | 514 | { |
9aebd98a | 515 | BDRVVdiState *s = (BDRVVdiState *)bs->opaque; |
67635f6a EB |
516 | size_t bmap_index = offset / s->block_size; |
517 | size_t index_in_block = offset % s->block_size; | |
9aebd98a | 518 | uint32_t bmap_entry = le32_to_cpu(s->bmap[bmap_index]); |
4bc74be9 PB |
519 | int result; |
520 | ||
67635f6a EB |
521 | logout("%p, %" PRId64 ", %" PRId64 ", %p\n", bs, offset, bytes, pnum); |
522 | *pnum = MIN(s->block_size - index_in_block, bytes); | |
4bc74be9 PB |
523 | result = VDI_IS_ALLOCATED(bmap_entry); |
524 | if (!result) { | |
525 | return 0; | |
526 | } | |
527 | ||
67635f6a EB |
528 | *map = s->header.offset_data + (uint64_t)bmap_entry * s->block_size + |
529 | index_in_block; | |
8bfb1371 | 530 | *file = bs->file->bs; |
67635f6a | 531 | return BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID; |
9aebd98a SW |
532 | } |
533 | ||
0865bb6f KW |
534 | static int coroutine_fn |
535 | vdi_co_preadv(BlockDriverState *bs, uint64_t offset, uint64_t bytes, | |
536 | QEMUIOVector *qiov, int flags) | |
9aebd98a | 537 | { |
9aebd98a | 538 | BDRVVdiState *s = bs->opaque; |
0865bb6f | 539 | QEMUIOVector local_qiov; |
9aebd98a SW |
540 | uint32_t bmap_entry; |
541 | uint32_t block_index; | |
0865bb6f KW |
542 | uint32_t offset_in_block; |
543 | uint32_t n_bytes; | |
544 | uint64_t bytes_done = 0; | |
eb9566d1 | 545 | int ret = 0; |
4de659e8 PB |
546 | |
547 | logout("\n"); | |
9aebd98a | 548 | |
0865bb6f | 549 | qemu_iovec_init(&local_qiov, qiov->niov); |
0c7bfc32 | 550 | |
0865bb6f KW |
551 | while (ret >= 0 && bytes > 0) { |
552 | block_index = offset / s->block_size; | |
553 | offset_in_block = offset % s->block_size; | |
554 | n_bytes = MIN(bytes, s->block_size - offset_in_block); | |
555 | ||
556 | logout("will read %u bytes starting at offset %" PRIu64 "\n", | |
557 | n_bytes, offset); | |
eb9566d1 PB |
558 | |
559 | /* prepare next AIO request */ | |
1e886639 | 560 | qemu_co_rwlock_rdlock(&s->bmap_lock); |
eb9566d1 | 561 | bmap_entry = le32_to_cpu(s->bmap[block_index]); |
1e886639 | 562 | qemu_co_rwlock_unlock(&s->bmap_lock); |
eb9566d1 PB |
563 | if (!VDI_IS_ALLOCATED(bmap_entry)) { |
564 | /* Block not allocated, return zeros, no need to wait. */ | |
0865bb6f | 565 | qemu_iovec_memset(qiov, bytes_done, 0, n_bytes); |
eb9566d1 PB |
566 | ret = 0; |
567 | } else { | |
0865bb6f KW |
568 | uint64_t data_offset = s->header.offset_data + |
569 | (uint64_t)bmap_entry * s->block_size + | |
570 | offset_in_block; | |
571 | ||
572 | qemu_iovec_reset(&local_qiov); | |
573 | qemu_iovec_concat(&local_qiov, qiov, bytes_done, n_bytes); | |
574 | ||
a03ef88f | 575 | ret = bdrv_co_preadv(bs->file, data_offset, n_bytes, |
0865bb6f | 576 | &local_qiov, 0); |
eb9566d1 | 577 | } |
0865bb6f | 578 | logout("%u bytes read\n", n_bytes); |
0c7bfc32 | 579 | |
0865bb6f KW |
580 | bytes -= n_bytes; |
581 | offset += n_bytes; | |
582 | bytes_done += n_bytes; | |
9aebd98a | 583 | } |
3d46a75a | 584 | |
0865bb6f KW |
585 | qemu_iovec_destroy(&local_qiov); |
586 | ||
3d46a75a | 587 | return ret; |
9aebd98a SW |
588 | } |
589 | ||
fde9d56f KW |
590 | static int coroutine_fn |
591 | vdi_co_pwritev(BlockDriverState *bs, uint64_t offset, uint64_t bytes, | |
592 | QEMUIOVector *qiov, int flags) | |
9aebd98a | 593 | { |
9aebd98a | 594 | BDRVVdiState *s = bs->opaque; |
fde9d56f | 595 | QEMUIOVector local_qiov; |
9aebd98a SW |
596 | uint32_t bmap_entry; |
597 | uint32_t block_index; | |
fde9d56f KW |
598 | uint32_t offset_in_block; |
599 | uint32_t n_bytes; | |
1e886639 | 600 | uint64_t data_offset; |
bfc45fc1 PB |
601 | uint32_t bmap_first = VDI_UNALLOCATED; |
602 | uint32_t bmap_last = VDI_UNALLOCATED; | |
bfc45fc1 | 603 | uint8_t *block = NULL; |
fde9d56f | 604 | uint64_t bytes_done = 0; |
eb9566d1 | 605 | int ret = 0; |
4de659e8 PB |
606 | |
607 | logout("\n"); | |
9aebd98a | 608 | |
fde9d56f | 609 | qemu_iovec_init(&local_qiov, qiov->niov); |
9aebd98a | 610 | |
fde9d56f KW |
611 | while (ret >= 0 && bytes > 0) { |
612 | block_index = offset / s->block_size; | |
613 | offset_in_block = offset % s->block_size; | |
614 | n_bytes = MIN(bytes, s->block_size - offset_in_block); | |
615 | ||
616 | logout("will write %u bytes starting at offset %" PRIu64 "\n", | |
617 | n_bytes, offset); | |
eb9566d1 PB |
618 | |
619 | /* prepare next AIO request */ | |
1e886639 | 620 | qemu_co_rwlock_rdlock(&s->bmap_lock); |
eb9566d1 PB |
621 | bmap_entry = le32_to_cpu(s->bmap[block_index]); |
622 | if (!VDI_IS_ALLOCATED(bmap_entry)) { | |
623 | /* Allocate new block and write to it. */ | |
fde9d56f | 624 | uint64_t data_offset; |
1e886639 PB |
625 | qemu_co_rwlock_upgrade(&s->bmap_lock); |
626 | bmap_entry = le32_to_cpu(s->bmap[block_index]); | |
627 | if (VDI_IS_ALLOCATED(bmap_entry)) { | |
628 | /* A concurrent allocation did the work for us. */ | |
629 | qemu_co_rwlock_downgrade(&s->bmap_lock); | |
630 | goto nonallocating_write; | |
631 | } | |
632 | ||
eb9566d1 PB |
633 | bmap_entry = s->header.blocks_allocated; |
634 | s->bmap[block_index] = cpu_to_le32(bmap_entry); | |
635 | s->header.blocks_allocated++; | |
fde9d56f KW |
636 | data_offset = s->header.offset_data + |
637 | (uint64_t)bmap_entry * s->block_size; | |
eb9566d1 PB |
638 | if (block == NULL) { |
639 | block = g_malloc(s->block_size); | |
640 | bmap_first = block_index; | |
641 | } | |
642 | bmap_last = block_index; | |
643 | /* Copy data to be written to new block and zero unused parts. */ | |
fde9d56f KW |
644 | memset(block, 0, offset_in_block); |
645 | qemu_iovec_to_buf(qiov, bytes_done, block + offset_in_block, | |
646 | n_bytes); | |
647 | memset(block + offset_in_block + n_bytes, 0, | |
648 | s->block_size - n_bytes - offset_in_block); | |
f0ab6f10 | 649 | |
1e886639 PB |
650 | /* Write the new block under CoRwLock write-side protection, |
651 | * so this full-cluster write does not overlap a partial write | |
652 | * of the same cluster, issued from the "else" branch. | |
653 | */ | |
d9ca2ea2 | 654 | ret = bdrv_pwrite(bs->file, data_offset, block, s->block_size); |
1e886639 | 655 | qemu_co_rwlock_unlock(&s->bmap_lock); |
eb9566d1 | 656 | } else { |
1e886639 PB |
657 | nonallocating_write: |
658 | data_offset = s->header.offset_data + | |
659 | (uint64_t)bmap_entry * s->block_size + | |
660 | offset_in_block; | |
661 | qemu_co_rwlock_unlock(&s->bmap_lock); | |
fde9d56f KW |
662 | |
663 | qemu_iovec_reset(&local_qiov); | |
664 | qemu_iovec_concat(&local_qiov, qiov, bytes_done, n_bytes); | |
665 | ||
a03ef88f | 666 | ret = bdrv_co_pwritev(bs->file, data_offset, n_bytes, |
fde9d56f | 667 | &local_qiov, 0); |
9aebd98a | 668 | } |
0c7bfc32 | 669 | |
fde9d56f KW |
670 | bytes -= n_bytes; |
671 | offset += n_bytes; | |
672 | bytes_done += n_bytes; | |
0c7bfc32 | 673 | |
fde9d56f | 674 | logout("%u bytes written\n", n_bytes); |
9aebd98a | 675 | } |
9aebd98a | 676 | |
fde9d56f KW |
677 | qemu_iovec_destroy(&local_qiov); |
678 | ||
0c7bfc32 | 679 | logout("finished data write\n"); |
4eea78e6 PB |
680 | if (ret < 0) { |
681 | return ret; | |
682 | } | |
683 | ||
684 | if (block) { | |
685 | /* One or more new blocks were allocated. */ | |
686 | VdiHeader *header = (VdiHeader *) block; | |
687 | uint8_t *base; | |
688 | uint64_t offset; | |
fde9d56f | 689 | uint32_t n_sectors; |
4eea78e6 PB |
690 | |
691 | logout("now writing modified header\n"); | |
692 | assert(VDI_IS_ALLOCATED(bmap_first)); | |
693 | *header = s->header; | |
694 | vdi_header_to_le(header); | |
18d51c4b | 695 | ret = bdrv_write(bs->file, 0, block, 1); |
bfc45fc1 PB |
696 | g_free(block); |
697 | block = NULL; | |
4eea78e6 PB |
698 | |
699 | if (ret < 0) { | |
700 | return ret; | |
0c7bfc32 | 701 | } |
4eea78e6 PB |
702 | |
703 | logout("now writing modified block map entry %u...%u\n", | |
704 | bmap_first, bmap_last); | |
705 | /* Write modified sectors from block map. */ | |
706 | bmap_first /= (SECTOR_SIZE / sizeof(uint32_t)); | |
707 | bmap_last /= (SECTOR_SIZE / sizeof(uint32_t)); | |
708 | n_sectors = bmap_last - bmap_first + 1; | |
709 | offset = s->bmap_sector + bmap_first; | |
710 | base = ((uint8_t *)&s->bmap[0]) + bmap_first * SECTOR_SIZE; | |
711 | logout("will write %u block map sectors starting from entry %u\n", | |
712 | n_sectors, bmap_first); | |
18d51c4b | 713 | ret = bdrv_write(bs->file, offset, base, n_sectors); |
0c7bfc32 PB |
714 | } |
715 | ||
3d46a75a | 716 | return ret; |
9aebd98a SW |
717 | } |
718 | ||
efc75e2a SH |
719 | static int coroutine_fn vdi_co_create_opts(const char *filename, QemuOpts *opts, |
720 | Error **errp) | |
9aebd98a | 721 | { |
dddc7750 | 722 | int ret = 0; |
9aebd98a SW |
723 | uint64_t bytes = 0; |
724 | uint32_t blocks; | |
99cce9fa | 725 | size_t block_size = DEFAULT_CLUSTER_SIZE; |
9aebd98a SW |
726 | uint32_t image_type = VDI_TYPE_DYNAMIC; |
727 | VdiHeader header; | |
728 | size_t i; | |
729 | size_t bmap_size; | |
70747862 JC |
730 | int64_t offset = 0; |
731 | Error *local_err = NULL; | |
a08f0c3b | 732 | BlockBackend *blk = NULL; |
70747862 | 733 | uint32_t *bmap = NULL; |
9aebd98a SW |
734 | |
735 | logout("\n"); | |
736 | ||
737 | /* Read out options. */ | |
c2eb918e HT |
738 | bytes = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0), |
739 | BDRV_SECTOR_SIZE); | |
9aebd98a | 740 | #if defined(CONFIG_VDI_BLOCK_SIZE) |
004b7f25 CL |
741 | /* TODO: Additional checks (SECTOR_SIZE * 2^n, ...). */ |
742 | block_size = qemu_opt_get_size_del(opts, | |
743 | BLOCK_OPT_CLUSTER_SIZE, | |
744 | DEFAULT_CLUSTER_SIZE); | |
9aebd98a SW |
745 | #endif |
746 | #if defined(CONFIG_VDI_STATIC_IMAGE) | |
004b7f25 CL |
747 | if (qemu_opt_get_bool_del(opts, BLOCK_OPT_STATIC, false)) { |
748 | image_type = VDI_TYPE_STATIC; | |
9aebd98a | 749 | } |
004b7f25 | 750 | #endif |
9aebd98a | 751 | |
63fa06dc | 752 | if (bytes > VDI_DISK_SIZE_MAX) { |
dddc7750 | 753 | ret = -ENOTSUP; |
63fa06dc JC |
754 | error_setg(errp, "Unsupported VDI image size (size is 0x%" PRIx64 |
755 | ", max supported is 0x%" PRIx64 ")", | |
756 | bytes, VDI_DISK_SIZE_MAX); | |
757 | goto exit; | |
758 | } | |
759 | ||
dddc7750 JC |
760 | ret = bdrv_create_file(filename, opts, &local_err); |
761 | if (ret < 0) { | |
70747862 | 762 | error_propagate(errp, local_err); |
63fa06dc | 763 | goto exit; |
9aebd98a | 764 | } |
a08f0c3b | 765 | |
efaa7c4e | 766 | blk = blk_new_open(filename, NULL, NULL, |
55880601 KW |
767 | BDRV_O_RDWR | BDRV_O_RESIZE | BDRV_O_PROTOCOL, |
768 | &local_err); | |
a08f0c3b | 769 | if (blk == NULL) { |
70747862 | 770 | error_propagate(errp, local_err); |
a08f0c3b | 771 | ret = -EIO; |
70747862 | 772 | goto exit; |
4ab15590 CL |
773 | } |
774 | ||
a08f0c3b KW |
775 | blk_set_allow_write_beyond_eof(blk, true); |
776 | ||
f21dc3a4 SW |
777 | /* We need enough blocks to store the given disk size, |
778 | so always round up. */ | |
e9082e47 | 779 | blocks = DIV_ROUND_UP(bytes, block_size); |
f21dc3a4 | 780 | |
9aebd98a | 781 | bmap_size = blocks * sizeof(uint32_t); |
e9082e47 | 782 | bmap_size = ROUND_UP(bmap_size, SECTOR_SIZE); |
9aebd98a SW |
783 | |
784 | memset(&header, 0, sizeof(header)); | |
1786dc15 | 785 | pstrcpy(header.text, sizeof(header.text), VDI_TEXT); |
9aebd98a SW |
786 | header.signature = VDI_SIGNATURE; |
787 | header.version = VDI_VERSION_1_1; | |
788 | header.header_size = 0x180; | |
789 | header.image_type = image_type; | |
790 | header.offset_bmap = 0x200; | |
791 | header.offset_data = 0x200 + bmap_size; | |
792 | header.sector_size = SECTOR_SIZE; | |
793 | header.disk_size = bytes; | |
794 | header.block_size = block_size; | |
795 | header.blocks_in_image = blocks; | |
6eea90eb SW |
796 | if (image_type == VDI_TYPE_STATIC) { |
797 | header.blocks_allocated = blocks; | |
798 | } | |
7c6f55b6 FZ |
799 | qemu_uuid_generate(&header.uuid_image); |
800 | qemu_uuid_generate(&header.uuid_last_snap); | |
9aebd98a SW |
801 | /* There is no need to set header.uuid_link or header.uuid_parent here. */ |
802 | #if defined(CONFIG_VDI_DEBUG) | |
803 | vdi_header_print(&header); | |
804 | #endif | |
805 | vdi_header_to_le(&header); | |
8341f00d | 806 | ret = blk_pwrite(blk, offset, &header, sizeof(header), 0); |
dddc7750 | 807 | if (ret < 0) { |
70747862 JC |
808 | error_setg(errp, "Error writing header to %s", filename); |
809 | goto exit; | |
9aebd98a | 810 | } |
70747862 | 811 | offset += sizeof(header); |
9aebd98a | 812 | |
b76b6e95 | 813 | if (bmap_size > 0) { |
17cce735 KW |
814 | bmap = g_try_malloc0(bmap_size); |
815 | if (bmap == NULL) { | |
816 | ret = -ENOMEM; | |
817 | error_setg(errp, "Could not allocate bmap"); | |
818 | goto exit; | |
819 | } | |
514f21a5 SW |
820 | for (i = 0; i < blocks; i++) { |
821 | if (image_type == VDI_TYPE_STATIC) { | |
822 | bmap[i] = i; | |
823 | } else { | |
824 | bmap[i] = VDI_UNALLOCATED; | |
825 | } | |
9aebd98a | 826 | } |
8341f00d | 827 | ret = blk_pwrite(blk, offset, bmap, bmap_size, 0); |
dddc7750 | 828 | if (ret < 0) { |
70747862 JC |
829 | error_setg(errp, "Error writing bmap to %s", filename); |
830 | goto exit; | |
514f21a5 | 831 | } |
70747862 | 832 | offset += bmap_size; |
9aebd98a | 833 | } |
514f21a5 | 834 | |
9aebd98a | 835 | if (image_type == VDI_TYPE_STATIC) { |
3a691c50 HR |
836 | ret = blk_truncate(blk, offset + blocks * block_size, |
837 | PREALLOC_MODE_OFF, errp); | |
dddc7750 | 838 | if (ret < 0) { |
ed3d2ec9 | 839 | error_prepend(errp, "Failed to statically allocate %s", filename); |
70747862 | 840 | goto exit; |
9aebd98a SW |
841 | } |
842 | } | |
843 | ||
63fa06dc | 844 | exit: |
a08f0c3b | 845 | blk_unref(blk); |
70747862 | 846 | g_free(bmap); |
dddc7750 | 847 | return ret; |
9aebd98a SW |
848 | } |
849 | ||
850 | static void vdi_close(BlockDriverState *bs) | |
851 | { | |
fc9d106c | 852 | BDRVVdiState *s = bs->opaque; |
6ac5f388 | 853 | |
17cce735 | 854 | qemu_vfree(s->bmap); |
6ac5f388 | 855 | |
fc9d106c KW |
856 | migrate_del_blocker(s->migration_blocker); |
857 | error_free(s->migration_blocker); | |
9aebd98a SW |
858 | } |
859 | ||
004b7f25 CL |
860 | static QemuOptsList vdi_create_opts = { |
861 | .name = "vdi-create-opts", | |
862 | .head = QTAILQ_HEAD_INITIALIZER(vdi_create_opts.head), | |
863 | .desc = { | |
864 | { | |
865 | .name = BLOCK_OPT_SIZE, | |
866 | .type = QEMU_OPT_SIZE, | |
867 | .help = "Virtual disk size" | |
868 | }, | |
9aebd98a | 869 | #if defined(CONFIG_VDI_BLOCK_SIZE) |
004b7f25 CL |
870 | { |
871 | .name = BLOCK_OPT_CLUSTER_SIZE, | |
872 | .type = QEMU_OPT_SIZE, | |
873 | .help = "VDI cluster (block) size", | |
874 | .def_value_str = stringify(DEFAULT_CLUSTER_SIZE) | |
875 | }, | |
9aebd98a SW |
876 | #endif |
877 | #if defined(CONFIG_VDI_STATIC_IMAGE) | |
004b7f25 CL |
878 | { |
879 | .name = BLOCK_OPT_STATIC, | |
880 | .type = QEMU_OPT_BOOL, | |
881 | .help = "VDI static (pre-allocated) image", | |
882 | .def_value_str = "off" | |
883 | }, | |
9aebd98a | 884 | #endif |
004b7f25 CL |
885 | /* TODO: An additional option to set UUID values might be useful. */ |
886 | { /* end of list */ } | |
887 | } | |
9aebd98a SW |
888 | }; |
889 | ||
890 | static BlockDriver bdrv_vdi = { | |
891 | .format_name = "vdi", | |
892 | .instance_size = sizeof(BDRVVdiState), | |
893 | .bdrv_probe = vdi_probe, | |
894 | .bdrv_open = vdi_open, | |
895 | .bdrv_close = vdi_close, | |
ecfe2bba | 896 | .bdrv_reopen_prepare = vdi_reopen_prepare, |
862f215f | 897 | .bdrv_child_perm = bdrv_format_default_perms, |
efc75e2a | 898 | .bdrv_co_create_opts = vdi_co_create_opts, |
3ac21627 | 899 | .bdrv_has_zero_init = bdrv_has_zero_init_1, |
67635f6a | 900 | .bdrv_co_block_status = vdi_co_block_status, |
9aebd98a SW |
901 | .bdrv_make_empty = vdi_make_empty, |
902 | ||
0865bb6f | 903 | .bdrv_co_preadv = vdi_co_preadv, |
9aebd98a | 904 | #if defined(CONFIG_VDI_WRITE) |
fde9d56f | 905 | .bdrv_co_pwritev = vdi_co_pwritev, |
9aebd98a SW |
906 | #endif |
907 | ||
908 | .bdrv_get_info = vdi_get_info, | |
909 | ||
004b7f25 | 910 | .create_opts = &vdi_create_opts, |
9aebd98a SW |
911 | .bdrv_check = vdi_check, |
912 | }; | |
913 | ||
914 | static void bdrv_vdi_init(void) | |
915 | { | |
916 | logout("\n"); | |
917 | bdrv_register(&bdrv_vdi); | |
918 | } | |
919 | ||
920 | block_init(bdrv_vdi_init); |