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Commit | Line | Data |
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585f8587 FB |
1 | /* |
2 | * Block driver for the QCOW version 2 format | |
5fafdf24 | 3 | * |
585f8587 | 4 | * Copyright (c) 2004-2006 Fabrice Bellard |
5fafdf24 | 5 | * |
585f8587 FB |
6 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
7 | * of this software and associated documentation files (the "Software"), to deal | |
8 | * in the Software without restriction, including without limitation the rights | |
9 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
10 | * copies of the Software, and to permit persons to whom the Software is | |
11 | * furnished to do so, subject to the following conditions: | |
12 | * | |
13 | * The above copyright notice and this permission notice shall be included in | |
14 | * all copies or substantial portions of the Software. | |
15 | * | |
16 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
17 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
18 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
19 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
20 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
21 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN | |
22 | * THE SOFTWARE. | |
23 | */ | |
faf07963 | 24 | #include "qemu-common.h" |
585f8587 | 25 | #include "block_int.h" |
5efa9d5a | 26 | #include "module.h" |
585f8587 FB |
27 | #include <zlib.h> |
28 | #include "aes.h" | |
f7d0fe02 | 29 | #include "block/qcow2.h" |
585f8587 FB |
30 | |
31 | /* | |
32 | Differences with QCOW: | |
33 | ||
34 | - Support for multiple incremental snapshots. | |
35 | - Memory management by reference counts. | |
36 | - Clusters which have a reference count of one have the bit | |
37 | QCOW_OFLAG_COPIED to optimize write performance. | |
5fafdf24 | 38 | - Size of compressed clusters is stored in sectors to reduce bit usage |
585f8587 FB |
39 | in the cluster offsets. |
40 | - Support for storing additional data (such as the VM state) in the | |
3b46e624 | 41 | snapshots. |
585f8587 FB |
42 | - If a backing store is used, the cluster size is not constrained |
43 | (could be backported to QCOW). | |
44 | - L2 tables have always a size of one cluster. | |
45 | */ | |
46 | ||
47 | //#define DEBUG_ALLOC | |
48 | //#define DEBUG_ALLOC2 | |
9b80ddf3 | 49 | //#define DEBUG_EXT |
5fafdf24 | 50 | |
9b80ddf3 AL |
51 | |
52 | typedef struct { | |
53 | uint32_t magic; | |
54 | uint32_t len; | |
55 | } QCowExtension; | |
56 | #define QCOW_EXT_MAGIC_END 0 | |
f965509c | 57 | #define QCOW_EXT_MAGIC_BACKING_FORMAT 0xE2792ACA |
9b80ddf3 AL |
58 | |
59 | ||
585f8587 FB |
60 | |
61 | static int qcow_probe(const uint8_t *buf, int buf_size, const char *filename) | |
62 | { | |
63 | const QCowHeader *cow_header = (const void *)buf; | |
3b46e624 | 64 | |
585f8587 FB |
65 | if (buf_size >= sizeof(QCowHeader) && |
66 | be32_to_cpu(cow_header->magic) == QCOW_MAGIC && | |
5fafdf24 | 67 | be32_to_cpu(cow_header->version) == QCOW_VERSION) |
585f8587 FB |
68 | return 100; |
69 | else | |
70 | return 0; | |
71 | } | |
72 | ||
9b80ddf3 AL |
73 | |
74 | /* | |
75 | * read qcow2 extension and fill bs | |
76 | * start reading from start_offset | |
77 | * finish reading upon magic of value 0 or when end_offset reached | |
78 | * unknown magic is skipped (future extension this version knows nothing about) | |
79 | * return 0 upon success, non-0 otherwise | |
80 | */ | |
81 | static int qcow_read_extensions(BlockDriverState *bs, uint64_t start_offset, | |
82 | uint64_t end_offset) | |
83 | { | |
84 | BDRVQcowState *s = bs->opaque; | |
85 | QCowExtension ext; | |
86 | uint64_t offset; | |
87 | ||
88 | #ifdef DEBUG_EXT | |
89 | printf("qcow_read_extensions: start=%ld end=%ld\n", start_offset, end_offset); | |
90 | #endif | |
91 | offset = start_offset; | |
92 | while (offset < end_offset) { | |
93 | ||
94 | #ifdef DEBUG_EXT | |
95 | /* Sanity check */ | |
96 | if (offset > s->cluster_size) | |
97 | printf("qcow_handle_extension: suspicious offset %lu\n", offset); | |
98 | ||
99 | printf("attemting to read extended header in offset %lu\n", offset); | |
100 | #endif | |
101 | ||
102 | if (bdrv_pread(s->hd, offset, &ext, sizeof(ext)) != sizeof(ext)) { | |
4c978075 AL |
103 | fprintf(stderr, "qcow_handle_extension: ERROR: pread fail from offset %llu\n", |
104 | (unsigned long long)offset); | |
9b80ddf3 AL |
105 | return 1; |
106 | } | |
107 | be32_to_cpus(&ext.magic); | |
108 | be32_to_cpus(&ext.len); | |
109 | offset += sizeof(ext); | |
110 | #ifdef DEBUG_EXT | |
111 | printf("ext.magic = 0x%x\n", ext.magic); | |
112 | #endif | |
113 | switch (ext.magic) { | |
114 | case QCOW_EXT_MAGIC_END: | |
115 | return 0; | |
f965509c AL |
116 | |
117 | case QCOW_EXT_MAGIC_BACKING_FORMAT: | |
118 | if (ext.len >= sizeof(bs->backing_format)) { | |
119 | fprintf(stderr, "ERROR: ext_backing_format: len=%u too large" | |
4c978075 | 120 | " (>=%zu)\n", |
f965509c AL |
121 | ext.len, sizeof(bs->backing_format)); |
122 | return 2; | |
123 | } | |
124 | if (bdrv_pread(s->hd, offset , bs->backing_format, | |
125 | ext.len) != ext.len) | |
126 | return 3; | |
127 | bs->backing_format[ext.len] = '\0'; | |
128 | #ifdef DEBUG_EXT | |
129 | printf("Qcow2: Got format extension %s\n", bs->backing_format); | |
130 | #endif | |
131 | offset += ((ext.len + 7) & ~7); | |
132 | break; | |
133 | ||
9b80ddf3 AL |
134 | default: |
135 | /* unknown magic -- just skip it */ | |
136 | offset += ((ext.len + 7) & ~7); | |
137 | break; | |
138 | } | |
139 | } | |
140 | ||
141 | return 0; | |
142 | } | |
143 | ||
144 | ||
585f8587 FB |
145 | static int qcow_open(BlockDriverState *bs, const char *filename, int flags) |
146 | { | |
147 | BDRVQcowState *s = bs->opaque; | |
148 | int len, i, shift, ret; | |
149 | QCowHeader header; | |
9b80ddf3 | 150 | uint64_t ext_end; |
585f8587 | 151 | |
4dc822d7 AL |
152 | /* Performance is terrible right now with cache=writethrough due mainly |
153 | * to reference count updates. If the user does not explicitly specify | |
154 | * a caching type, force to writeback caching. | |
155 | */ | |
156 | if ((flags & BDRV_O_CACHE_DEF)) { | |
157 | flags |= BDRV_O_CACHE_WB; | |
158 | flags &= ~BDRV_O_CACHE_DEF; | |
159 | } | |
b5eff355 | 160 | ret = bdrv_file_open(&s->hd, filename, flags); |
585f8587 FB |
161 | if (ret < 0) |
162 | return ret; | |
163 | if (bdrv_pread(s->hd, 0, &header, sizeof(header)) != sizeof(header)) | |
164 | goto fail; | |
165 | be32_to_cpus(&header.magic); | |
166 | be32_to_cpus(&header.version); | |
167 | be64_to_cpus(&header.backing_file_offset); | |
168 | be32_to_cpus(&header.backing_file_size); | |
169 | be64_to_cpus(&header.size); | |
170 | be32_to_cpus(&header.cluster_bits); | |
171 | be32_to_cpus(&header.crypt_method); | |
172 | be64_to_cpus(&header.l1_table_offset); | |
173 | be32_to_cpus(&header.l1_size); | |
174 | be64_to_cpus(&header.refcount_table_offset); | |
175 | be32_to_cpus(&header.refcount_table_clusters); | |
176 | be64_to_cpus(&header.snapshots_offset); | |
177 | be32_to_cpus(&header.nb_snapshots); | |
3b46e624 | 178 | |
585f8587 FB |
179 | if (header.magic != QCOW_MAGIC || header.version != QCOW_VERSION) |
180 | goto fail; | |
5fafdf24 | 181 | if (header.size <= 1 || |
73c632ed KW |
182 | header.cluster_bits < MIN_CLUSTER_BITS || |
183 | header.cluster_bits > MAX_CLUSTER_BITS) | |
585f8587 FB |
184 | goto fail; |
185 | if (header.crypt_method > QCOW_CRYPT_AES) | |
186 | goto fail; | |
187 | s->crypt_method_header = header.crypt_method; | |
188 | if (s->crypt_method_header) | |
189 | bs->encrypted = 1; | |
190 | s->cluster_bits = header.cluster_bits; | |
191 | s->cluster_size = 1 << s->cluster_bits; | |
192 | s->cluster_sectors = 1 << (s->cluster_bits - 9); | |
193 | s->l2_bits = s->cluster_bits - 3; /* L2 is always one cluster */ | |
194 | s->l2_size = 1 << s->l2_bits; | |
195 | bs->total_sectors = header.size / 512; | |
196 | s->csize_shift = (62 - (s->cluster_bits - 8)); | |
197 | s->csize_mask = (1 << (s->cluster_bits - 8)) - 1; | |
198 | s->cluster_offset_mask = (1LL << s->csize_shift) - 1; | |
199 | s->refcount_table_offset = header.refcount_table_offset; | |
5fafdf24 | 200 | s->refcount_table_size = |
585f8587 FB |
201 | header.refcount_table_clusters << (s->cluster_bits - 3); |
202 | ||
203 | s->snapshots_offset = header.snapshots_offset; | |
204 | s->nb_snapshots = header.nb_snapshots; | |
205 | ||
206 | /* read the level 1 table */ | |
207 | s->l1_size = header.l1_size; | |
208 | shift = s->cluster_bits + s->l2_bits; | |
209 | s->l1_vm_state_index = (header.size + (1LL << shift) - 1) >> shift; | |
210 | /* the L1 table must contain at least enough entries to put | |
211 | header.size bytes */ | |
212 | if (s->l1_size < s->l1_vm_state_index) | |
213 | goto fail; | |
214 | s->l1_table_offset = header.l1_table_offset; | |
215 | s->l1_table = qemu_malloc(s->l1_size * sizeof(uint64_t)); | |
5fafdf24 | 216 | if (bdrv_pread(s->hd, s->l1_table_offset, s->l1_table, s->l1_size * sizeof(uint64_t)) != |
585f8587 FB |
217 | s->l1_size * sizeof(uint64_t)) |
218 | goto fail; | |
219 | for(i = 0;i < s->l1_size; i++) { | |
220 | be64_to_cpus(&s->l1_table[i]); | |
221 | } | |
222 | /* alloc L2 cache */ | |
223 | s->l2_cache = qemu_malloc(s->l2_size * L2_CACHE_SIZE * sizeof(uint64_t)); | |
585f8587 | 224 | s->cluster_cache = qemu_malloc(s->cluster_size); |
585f8587 | 225 | /* one more sector for decompressed data alignment */ |
095a9c58 AL |
226 | s->cluster_data = qemu_malloc(QCOW_MAX_CRYPT_CLUSTERS * s->cluster_size |
227 | + 512); | |
585f8587 | 228 | s->cluster_cache_offset = -1; |
3b46e624 | 229 | |
585f8587 FB |
230 | if (refcount_init(bs) < 0) |
231 | goto fail; | |
232 | ||
9b80ddf3 AL |
233 | /* read qcow2 extensions */ |
234 | if (header.backing_file_offset) | |
235 | ext_end = header.backing_file_offset; | |
236 | else | |
237 | ext_end = s->cluster_size; | |
238 | if (qcow_read_extensions(bs, sizeof(header), ext_end)) | |
239 | goto fail; | |
240 | ||
585f8587 FB |
241 | /* read the backing file name */ |
242 | if (header.backing_file_offset != 0) { | |
243 | len = header.backing_file_size; | |
244 | if (len > 1023) | |
245 | len = 1023; | |
246 | if (bdrv_pread(s->hd, header.backing_file_offset, bs->backing_file, len) != len) | |
247 | goto fail; | |
248 | bs->backing_file[len] = '\0'; | |
249 | } | |
250 | if (qcow_read_snapshots(bs) < 0) | |
251 | goto fail; | |
252 | ||
253 | #ifdef DEBUG_ALLOC | |
254 | check_refcounts(bs); | |
255 | #endif | |
256 | return 0; | |
257 | ||
258 | fail: | |
259 | qcow_free_snapshots(bs); | |
260 | refcount_close(bs); | |
261 | qemu_free(s->l1_table); | |
262 | qemu_free(s->l2_cache); | |
263 | qemu_free(s->cluster_cache); | |
264 | qemu_free(s->cluster_data); | |
265 | bdrv_delete(s->hd); | |
266 | return -1; | |
267 | } | |
268 | ||
269 | static int qcow_set_key(BlockDriverState *bs, const char *key) | |
270 | { | |
271 | BDRVQcowState *s = bs->opaque; | |
272 | uint8_t keybuf[16]; | |
273 | int len, i; | |
3b46e624 | 274 | |
585f8587 FB |
275 | memset(keybuf, 0, 16); |
276 | len = strlen(key); | |
277 | if (len > 16) | |
278 | len = 16; | |
279 | /* XXX: we could compress the chars to 7 bits to increase | |
280 | entropy */ | |
281 | for(i = 0;i < len;i++) { | |
282 | keybuf[i] = key[i]; | |
283 | } | |
284 | s->crypt_method = s->crypt_method_header; | |
285 | ||
286 | if (AES_set_encrypt_key(keybuf, 128, &s->aes_encrypt_key) != 0) | |
287 | return -1; | |
288 | if (AES_set_decrypt_key(keybuf, 128, &s->aes_decrypt_key) != 0) | |
289 | return -1; | |
290 | #if 0 | |
291 | /* test */ | |
292 | { | |
293 | uint8_t in[16]; | |
294 | uint8_t out[16]; | |
295 | uint8_t tmp[16]; | |
296 | for(i=0;i<16;i++) | |
297 | in[i] = i; | |
298 | AES_encrypt(in, tmp, &s->aes_encrypt_key); | |
299 | AES_decrypt(tmp, out, &s->aes_decrypt_key); | |
300 | for(i = 0; i < 16; i++) | |
301 | printf(" %02x", tmp[i]); | |
302 | printf("\n"); | |
303 | for(i = 0; i < 16; i++) | |
304 | printf(" %02x", out[i]); | |
305 | printf("\n"); | |
306 | } | |
307 | #endif | |
308 | return 0; | |
309 | } | |
310 | ||
5fafdf24 | 311 | static int qcow_is_allocated(BlockDriverState *bs, int64_t sector_num, |
585f8587 FB |
312 | int nb_sectors, int *pnum) |
313 | { | |
585f8587 FB |
314 | uint64_t cluster_offset; |
315 | ||
095a9c58 AL |
316 | *pnum = nb_sectors; |
317 | cluster_offset = get_cluster_offset(bs, sector_num << 9, pnum); | |
318 | ||
585f8587 FB |
319 | return (cluster_offset != 0); |
320 | } | |
321 | ||
a9465922 | 322 | /* handle reading after the end of the backing file */ |
45aba42f KW |
323 | int backing_read1(BlockDriverState *bs, |
324 | int64_t sector_num, uint8_t *buf, int nb_sectors) | |
a9465922 FB |
325 | { |
326 | int n1; | |
327 | if ((sector_num + nb_sectors) <= bs->total_sectors) | |
328 | return nb_sectors; | |
329 | if (sector_num >= bs->total_sectors) | |
330 | n1 = 0; | |
331 | else | |
332 | n1 = bs->total_sectors - sector_num; | |
333 | memset(buf + n1 * 512, 0, 512 * (nb_sectors - n1)); | |
334 | return n1; | |
335 | } | |
336 | ||
ce1a14dc PB |
337 | typedef struct QCowAIOCB { |
338 | BlockDriverAIOCB common; | |
585f8587 | 339 | int64_t sector_num; |
f141eafe | 340 | QEMUIOVector *qiov; |
585f8587 | 341 | uint8_t *buf; |
f141eafe | 342 | void *orig_buf; |
585f8587 FB |
343 | int nb_sectors; |
344 | int n; | |
345 | uint64_t cluster_offset; | |
5fafdf24 | 346 | uint8_t *cluster_data; |
585f8587 | 347 | BlockDriverAIOCB *hd_aiocb; |
c87c0672 AL |
348 | struct iovec hd_iov; |
349 | QEMUIOVector hd_qiov; | |
1490791f | 350 | QEMUBH *bh; |
e976c6a1 | 351 | QCowL2Meta l2meta; |
585f8587 FB |
352 | } QCowAIOCB; |
353 | ||
c16b5a2c CH |
354 | static void qcow_aio_cancel(BlockDriverAIOCB *blockacb) |
355 | { | |
356 | QCowAIOCB *acb = (QCowAIOCB *)blockacb; | |
357 | if (acb->hd_aiocb) | |
358 | bdrv_aio_cancel(acb->hd_aiocb); | |
359 | qemu_aio_release(acb); | |
360 | } | |
361 | ||
362 | static AIOPool qcow_aio_pool = { | |
363 | .aiocb_size = sizeof(QCowAIOCB), | |
364 | .cancel = qcow_aio_cancel, | |
365 | }; | |
366 | ||
1490791f AL |
367 | static void qcow_aio_read_cb(void *opaque, int ret); |
368 | static void qcow_aio_read_bh(void *opaque) | |
369 | { | |
370 | QCowAIOCB *acb = opaque; | |
371 | qemu_bh_delete(acb->bh); | |
372 | acb->bh = NULL; | |
373 | qcow_aio_read_cb(opaque, 0); | |
374 | } | |
375 | ||
a32ef786 AL |
376 | static int qcow_schedule_bh(QEMUBHFunc *cb, QCowAIOCB *acb) |
377 | { | |
378 | if (acb->bh) | |
379 | return -EIO; | |
380 | ||
381 | acb->bh = qemu_bh_new(cb, acb); | |
382 | if (!acb->bh) | |
383 | return -EIO; | |
384 | ||
385 | qemu_bh_schedule(acb->bh); | |
386 | ||
387 | return 0; | |
388 | } | |
389 | ||
585f8587 FB |
390 | static void qcow_aio_read_cb(void *opaque, int ret) |
391 | { | |
ce1a14dc PB |
392 | QCowAIOCB *acb = opaque; |
393 | BlockDriverState *bs = acb->common.bs; | |
585f8587 | 394 | BDRVQcowState *s = bs->opaque; |
a9465922 | 395 | int index_in_cluster, n1; |
585f8587 | 396 | |
ce1a14dc | 397 | acb->hd_aiocb = NULL; |
f141eafe AL |
398 | if (ret < 0) |
399 | goto done; | |
585f8587 | 400 | |
585f8587 | 401 | /* post process the read buffer */ |
ce1a14dc | 402 | if (!acb->cluster_offset) { |
585f8587 | 403 | /* nothing to do */ |
ce1a14dc | 404 | } else if (acb->cluster_offset & QCOW_OFLAG_COMPRESSED) { |
585f8587 FB |
405 | /* nothing to do */ |
406 | } else { | |
407 | if (s->crypt_method) { | |
5fafdf24 TS |
408 | encrypt_sectors(s, acb->sector_num, acb->buf, acb->buf, |
409 | acb->n, 0, | |
585f8587 FB |
410 | &s->aes_decrypt_key); |
411 | } | |
412 | } | |
413 | ||
ce1a14dc PB |
414 | acb->nb_sectors -= acb->n; |
415 | acb->sector_num += acb->n; | |
416 | acb->buf += acb->n * 512; | |
585f8587 | 417 | |
ce1a14dc | 418 | if (acb->nb_sectors == 0) { |
585f8587 | 419 | /* request completed */ |
f141eafe AL |
420 | ret = 0; |
421 | goto done; | |
585f8587 | 422 | } |
3b46e624 | 423 | |
585f8587 | 424 | /* prepare next AIO request */ |
095a9c58 AL |
425 | acb->n = acb->nb_sectors; |
426 | acb->cluster_offset = get_cluster_offset(bs, acb->sector_num << 9, &acb->n); | |
ce1a14dc | 427 | index_in_cluster = acb->sector_num & (s->cluster_sectors - 1); |
ce1a14dc PB |
428 | |
429 | if (!acb->cluster_offset) { | |
585f8587 FB |
430 | if (bs->backing_hd) { |
431 | /* read from the base image */ | |
5fafdf24 | 432 | n1 = backing_read1(bs->backing_hd, acb->sector_num, |
ce1a14dc | 433 | acb->buf, acb->n); |
a9465922 | 434 | if (n1 > 0) { |
3f4cb3d3 | 435 | acb->hd_iov.iov_base = (void *)acb->buf; |
c87c0672 AL |
436 | acb->hd_iov.iov_len = acb->n * 512; |
437 | qemu_iovec_init_external(&acb->hd_qiov, &acb->hd_iov, 1); | |
438 | acb->hd_aiocb = bdrv_aio_readv(bs->backing_hd, acb->sector_num, | |
439 | &acb->hd_qiov, acb->n, | |
440 | qcow_aio_read_cb, acb); | |
ce1a14dc | 441 | if (acb->hd_aiocb == NULL) |
f141eafe | 442 | goto done; |
a9465922 | 443 | } else { |
a32ef786 AL |
444 | ret = qcow_schedule_bh(qcow_aio_read_bh, acb); |
445 | if (ret < 0) | |
f141eafe | 446 | goto done; |
a9465922 | 447 | } |
585f8587 FB |
448 | } else { |
449 | /* Note: in this case, no need to wait */ | |
ce1a14dc | 450 | memset(acb->buf, 0, 512 * acb->n); |
a32ef786 AL |
451 | ret = qcow_schedule_bh(qcow_aio_read_bh, acb); |
452 | if (ret < 0) | |
f141eafe | 453 | goto done; |
585f8587 | 454 | } |
ce1a14dc | 455 | } else if (acb->cluster_offset & QCOW_OFLAG_COMPRESSED) { |
585f8587 | 456 | /* add AIO support for compressed blocks ? */ |
ce1a14dc | 457 | if (decompress_cluster(s, acb->cluster_offset) < 0) |
f141eafe | 458 | goto done; |
5fafdf24 | 459 | memcpy(acb->buf, |
ce1a14dc | 460 | s->cluster_cache + index_in_cluster * 512, 512 * acb->n); |
a32ef786 AL |
461 | ret = qcow_schedule_bh(qcow_aio_read_bh, acb); |
462 | if (ret < 0) | |
f141eafe | 463 | goto done; |
585f8587 | 464 | } else { |
ce1a14dc | 465 | if ((acb->cluster_offset & 511) != 0) { |
585f8587 | 466 | ret = -EIO; |
f141eafe | 467 | goto done; |
585f8587 | 468 | } |
c87c0672 | 469 | |
3f4cb3d3 | 470 | acb->hd_iov.iov_base = (void *)acb->buf; |
c87c0672 AL |
471 | acb->hd_iov.iov_len = acb->n * 512; |
472 | qemu_iovec_init_external(&acb->hd_qiov, &acb->hd_iov, 1); | |
473 | acb->hd_aiocb = bdrv_aio_readv(s->hd, | |
5fafdf24 | 474 | (acb->cluster_offset >> 9) + index_in_cluster, |
c87c0672 | 475 | &acb->hd_qiov, acb->n, qcow_aio_read_cb, acb); |
ce1a14dc | 476 | if (acb->hd_aiocb == NULL) |
f141eafe AL |
477 | goto done; |
478 | } | |
479 | ||
480 | return; | |
481 | done: | |
482 | if (acb->qiov->niov > 1) { | |
483 | qemu_iovec_from_buffer(acb->qiov, acb->orig_buf, acb->qiov->size); | |
484 | qemu_vfree(acb->orig_buf); | |
585f8587 | 485 | } |
f141eafe AL |
486 | acb->common.cb(acb->common.opaque, ret); |
487 | qemu_aio_release(acb); | |
585f8587 FB |
488 | } |
489 | ||
ce1a14dc | 490 | static QCowAIOCB *qcow_aio_setup(BlockDriverState *bs, |
f141eafe AL |
491 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, |
492 | BlockDriverCompletionFunc *cb, void *opaque, int is_write) | |
585f8587 | 493 | { |
ce1a14dc PB |
494 | QCowAIOCB *acb; |
495 | ||
c16b5a2c | 496 | acb = qemu_aio_get(&qcow_aio_pool, bs, cb, opaque); |
ce1a14dc PB |
497 | if (!acb) |
498 | return NULL; | |
499 | acb->hd_aiocb = NULL; | |
500 | acb->sector_num = sector_num; | |
f141eafe AL |
501 | acb->qiov = qiov; |
502 | if (qiov->niov > 1) { | |
e268ca52 | 503 | acb->buf = acb->orig_buf = qemu_blockalign(bs, qiov->size); |
f141eafe AL |
504 | if (is_write) |
505 | qemu_iovec_to_buffer(qiov, acb->buf); | |
3f4cb3d3 BS |
506 | } else { |
507 | acb->buf = (uint8_t *)qiov->iov->iov_base; | |
508 | } | |
ce1a14dc PB |
509 | acb->nb_sectors = nb_sectors; |
510 | acb->n = 0; | |
511 | acb->cluster_offset = 0; | |
e976c6a1 | 512 | acb->l2meta.nb_clusters = 0; |
ce1a14dc PB |
513 | return acb; |
514 | } | |
515 | ||
f141eafe AL |
516 | static BlockDriverAIOCB *qcow_aio_readv(BlockDriverState *bs, |
517 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
ce1a14dc PB |
518 | BlockDriverCompletionFunc *cb, void *opaque) |
519 | { | |
520 | QCowAIOCB *acb; | |
521 | ||
f141eafe | 522 | acb = qcow_aio_setup(bs, sector_num, qiov, nb_sectors, cb, opaque, 0); |
ce1a14dc PB |
523 | if (!acb) |
524 | return NULL; | |
585f8587 FB |
525 | |
526 | qcow_aio_read_cb(acb, 0); | |
ce1a14dc | 527 | return &acb->common; |
585f8587 FB |
528 | } |
529 | ||
530 | static void qcow_aio_write_cb(void *opaque, int ret) | |
531 | { | |
ce1a14dc PB |
532 | QCowAIOCB *acb = opaque; |
533 | BlockDriverState *bs = acb->common.bs; | |
585f8587 | 534 | BDRVQcowState *s = bs->opaque; |
585f8587 | 535 | int index_in_cluster; |
585f8587 | 536 | const uint8_t *src_buf; |
095a9c58 | 537 | int n_end; |
ce1a14dc PB |
538 | |
539 | acb->hd_aiocb = NULL; | |
540 | ||
f141eafe AL |
541 | if (ret < 0) |
542 | goto done; | |
585f8587 | 543 | |
e976c6a1 AL |
544 | if (alloc_cluster_link_l2(bs, acb->cluster_offset, &acb->l2meta) < 0) { |
545 | free_any_clusters(bs, acb->cluster_offset, acb->l2meta.nb_clusters); | |
f141eafe | 546 | goto done; |
e976c6a1 AL |
547 | } |
548 | ||
ce1a14dc PB |
549 | acb->nb_sectors -= acb->n; |
550 | acb->sector_num += acb->n; | |
551 | acb->buf += acb->n * 512; | |
585f8587 | 552 | |
ce1a14dc | 553 | if (acb->nb_sectors == 0) { |
585f8587 | 554 | /* request completed */ |
f141eafe AL |
555 | ret = 0; |
556 | goto done; | |
585f8587 | 557 | } |
3b46e624 | 558 | |
ce1a14dc | 559 | index_in_cluster = acb->sector_num & (s->cluster_sectors - 1); |
095a9c58 AL |
560 | n_end = index_in_cluster + acb->nb_sectors; |
561 | if (s->crypt_method && | |
562 | n_end > QCOW_MAX_CRYPT_CLUSTERS * s->cluster_sectors) | |
563 | n_end = QCOW_MAX_CRYPT_CLUSTERS * s->cluster_sectors; | |
564 | ||
e976c6a1 | 565 | acb->cluster_offset = alloc_cluster_offset(bs, acb->sector_num << 9, |
05203524 | 566 | index_in_cluster, |
e976c6a1 AL |
567 | n_end, &acb->n, &acb->l2meta); |
568 | if (!acb->cluster_offset || (acb->cluster_offset & 511) != 0) { | |
585f8587 | 569 | ret = -EIO; |
f141eafe | 570 | goto done; |
585f8587 FB |
571 | } |
572 | if (s->crypt_method) { | |
ce1a14dc | 573 | if (!acb->cluster_data) { |
095a9c58 AL |
574 | acb->cluster_data = qemu_mallocz(QCOW_MAX_CRYPT_CLUSTERS * |
575 | s->cluster_size); | |
585f8587 | 576 | } |
5fafdf24 | 577 | encrypt_sectors(s, acb->sector_num, acb->cluster_data, acb->buf, |
ce1a14dc PB |
578 | acb->n, 1, &s->aes_encrypt_key); |
579 | src_buf = acb->cluster_data; | |
585f8587 | 580 | } else { |
ce1a14dc | 581 | src_buf = acb->buf; |
585f8587 | 582 | } |
c87c0672 AL |
583 | acb->hd_iov.iov_base = (void *)src_buf; |
584 | acb->hd_iov.iov_len = acb->n * 512; | |
585 | qemu_iovec_init_external(&acb->hd_qiov, &acb->hd_iov, 1); | |
586 | acb->hd_aiocb = bdrv_aio_writev(s->hd, | |
587 | (acb->cluster_offset >> 9) + index_in_cluster, | |
588 | &acb->hd_qiov, acb->n, | |
589 | qcow_aio_write_cb, acb); | |
ce1a14dc | 590 | if (acb->hd_aiocb == NULL) |
f141eafe AL |
591 | goto done; |
592 | ||
593 | return; | |
594 | ||
595 | done: | |
596 | if (acb->qiov->niov > 1) | |
597 | qemu_vfree(acb->orig_buf); | |
598 | acb->common.cb(acb->common.opaque, ret); | |
599 | qemu_aio_release(acb); | |
585f8587 FB |
600 | } |
601 | ||
f141eafe AL |
602 | static BlockDriverAIOCB *qcow_aio_writev(BlockDriverState *bs, |
603 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
ce1a14dc | 604 | BlockDriverCompletionFunc *cb, void *opaque) |
585f8587 | 605 | { |
585f8587 | 606 | BDRVQcowState *s = bs->opaque; |
ce1a14dc | 607 | QCowAIOCB *acb; |
3b46e624 | 608 | |
585f8587 FB |
609 | s->cluster_cache_offset = -1; /* disable compressed cache */ |
610 | ||
f141eafe | 611 | acb = qcow_aio_setup(bs, sector_num, qiov, nb_sectors, cb, opaque, 1); |
ce1a14dc PB |
612 | if (!acb) |
613 | return NULL; | |
3b46e624 | 614 | |
585f8587 | 615 | qcow_aio_write_cb(acb, 0); |
ce1a14dc | 616 | return &acb->common; |
585f8587 FB |
617 | } |
618 | ||
585f8587 FB |
619 | static void qcow_close(BlockDriverState *bs) |
620 | { | |
621 | BDRVQcowState *s = bs->opaque; | |
622 | qemu_free(s->l1_table); | |
623 | qemu_free(s->l2_cache); | |
624 | qemu_free(s->cluster_cache); | |
625 | qemu_free(s->cluster_data); | |
626 | refcount_close(bs); | |
627 | bdrv_delete(s->hd); | |
628 | } | |
629 | ||
73c632ed KW |
630 | static int get_bits_from_size(size_t size) |
631 | { | |
632 | int res = 0; | |
633 | ||
634 | if (size == 0) { | |
635 | return -1; | |
636 | } | |
637 | ||
638 | while (size != 1) { | |
639 | /* Not a power of two */ | |
640 | if (size & 1) { | |
641 | return -1; | |
642 | } | |
643 | ||
644 | size >>= 1; | |
645 | res++; | |
646 | } | |
647 | ||
648 | return res; | |
649 | } | |
650 | ||
f965509c AL |
651 | static int qcow_create2(const char *filename, int64_t total_size, |
652 | const char *backing_file, const char *backing_format, | |
73c632ed | 653 | int flags, size_t cluster_size) |
585f8587 | 654 | { |
f965509c | 655 | |
585f8587 | 656 | int fd, header_size, backing_filename_len, l1_size, i, shift, l2_bits; |
2d2431f0 | 657 | int ref_clusters, backing_format_len = 0; |
585f8587 FB |
658 | QCowHeader header; |
659 | uint64_t tmp, offset; | |
660 | QCowCreateState s1, *s = &s1; | |
f965509c AL |
661 | QCowExtension ext_bf = {0, 0}; |
662 | ||
3b46e624 | 663 | |
585f8587 FB |
664 | memset(s, 0, sizeof(*s)); |
665 | ||
666 | fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY, 0644); | |
667 | if (fd < 0) | |
668 | return -1; | |
669 | memset(&header, 0, sizeof(header)); | |
670 | header.magic = cpu_to_be32(QCOW_MAGIC); | |
671 | header.version = cpu_to_be32(QCOW_VERSION); | |
672 | header.size = cpu_to_be64(total_size * 512); | |
673 | header_size = sizeof(header); | |
674 | backing_filename_len = 0; | |
675 | if (backing_file) { | |
f965509c AL |
676 | if (backing_format) { |
677 | ext_bf.magic = QCOW_EXT_MAGIC_BACKING_FORMAT; | |
678 | backing_format_len = strlen(backing_format); | |
679 | ext_bf.len = (backing_format_len + 7) & ~7; | |
680 | header_size += ((sizeof(ext_bf) + ext_bf.len + 7) & ~7); | |
681 | } | |
585f8587 FB |
682 | header.backing_file_offset = cpu_to_be64(header_size); |
683 | backing_filename_len = strlen(backing_file); | |
684 | header.backing_file_size = cpu_to_be32(backing_filename_len); | |
685 | header_size += backing_filename_len; | |
686 | } | |
73c632ed KW |
687 | |
688 | /* Cluster size */ | |
689 | s->cluster_bits = get_bits_from_size(cluster_size); | |
690 | if (s->cluster_bits < MIN_CLUSTER_BITS || | |
691 | s->cluster_bits > MAX_CLUSTER_BITS) | |
692 | { | |
693 | fprintf(stderr, "Cluster size must be a power of two between " | |
694 | "%d and %dk\n", | |
695 | 1 << MIN_CLUSTER_BITS, | |
696 | 1 << (MAX_CLUSTER_BITS - 10)); | |
697 | return -EINVAL; | |
698 | } | |
585f8587 | 699 | s->cluster_size = 1 << s->cluster_bits; |
73c632ed | 700 | |
585f8587 FB |
701 | header.cluster_bits = cpu_to_be32(s->cluster_bits); |
702 | header_size = (header_size + 7) & ~7; | |
ec36ba14 | 703 | if (flags & BLOCK_FLAG_ENCRYPT) { |
585f8587 FB |
704 | header.crypt_method = cpu_to_be32(QCOW_CRYPT_AES); |
705 | } else { | |
706 | header.crypt_method = cpu_to_be32(QCOW_CRYPT_NONE); | |
707 | } | |
708 | l2_bits = s->cluster_bits - 3; | |
709 | shift = s->cluster_bits + l2_bits; | |
710 | l1_size = (((total_size * 512) + (1LL << shift) - 1) >> shift); | |
711 | offset = align_offset(header_size, s->cluster_size); | |
712 | s->l1_table_offset = offset; | |
713 | header.l1_table_offset = cpu_to_be64(s->l1_table_offset); | |
714 | header.l1_size = cpu_to_be32(l1_size); | |
15e6690a | 715 | offset += align_offset(l1_size * sizeof(uint64_t), s->cluster_size); |
585f8587 FB |
716 | |
717 | s->refcount_table = qemu_mallocz(s->cluster_size); | |
3b46e624 | 718 | |
585f8587 FB |
719 | s->refcount_table_offset = offset; |
720 | header.refcount_table_offset = cpu_to_be64(offset); | |
721 | header.refcount_table_clusters = cpu_to_be32(1); | |
722 | offset += s->cluster_size; | |
585f8587 | 723 | s->refcount_block_offset = offset; |
2d2431f0 AL |
724 | |
725 | /* count how many refcount blocks needed */ | |
726 | tmp = offset >> s->cluster_bits; | |
727 | ref_clusters = (tmp >> (s->cluster_bits - REFCOUNT_SHIFT)) + 1; | |
728 | for (i=0; i < ref_clusters; i++) { | |
729 | s->refcount_table[i] = cpu_to_be64(offset); | |
730 | offset += s->cluster_size; | |
731 | } | |
732 | ||
733 | s->refcount_block = qemu_mallocz(ref_clusters * s->cluster_size); | |
585f8587 FB |
734 | |
735 | /* update refcounts */ | |
736 | create_refcount_update(s, 0, header_size); | |
15e6690a | 737 | create_refcount_update(s, s->l1_table_offset, l1_size * sizeof(uint64_t)); |
585f8587 | 738 | create_refcount_update(s, s->refcount_table_offset, s->cluster_size); |
2d2431f0 | 739 | create_refcount_update(s, s->refcount_block_offset, ref_clusters * s->cluster_size); |
3b46e624 | 740 | |
585f8587 FB |
741 | /* write all the data */ |
742 | write(fd, &header, sizeof(header)); | |
743 | if (backing_file) { | |
f965509c AL |
744 | if (backing_format_len) { |
745 | char zero[16]; | |
746 | int d = ext_bf.len - backing_format_len; | |
747 | ||
748 | memset(zero, 0, sizeof(zero)); | |
749 | cpu_to_be32s(&ext_bf.magic); | |
750 | cpu_to_be32s(&ext_bf.len); | |
751 | write(fd, &ext_bf, sizeof(ext_bf)); | |
752 | write(fd, backing_format, backing_format_len); | |
753 | if (d>0) { | |
754 | write(fd, zero, d); | |
755 | } | |
756 | } | |
585f8587 FB |
757 | write(fd, backing_file, backing_filename_len); |
758 | } | |
759 | lseek(fd, s->l1_table_offset, SEEK_SET); | |
760 | tmp = 0; | |
761 | for(i = 0;i < l1_size; i++) { | |
762 | write(fd, &tmp, sizeof(tmp)); | |
763 | } | |
764 | lseek(fd, s->refcount_table_offset, SEEK_SET); | |
765 | write(fd, s->refcount_table, s->cluster_size); | |
3b46e624 | 766 | |
585f8587 | 767 | lseek(fd, s->refcount_block_offset, SEEK_SET); |
2d2431f0 | 768 | write(fd, s->refcount_block, ref_clusters * s->cluster_size); |
585f8587 FB |
769 | |
770 | qemu_free(s->refcount_table); | |
771 | qemu_free(s->refcount_block); | |
772 | close(fd); | |
773 | return 0; | |
585f8587 FB |
774 | } |
775 | ||
0e7e1989 KW |
776 | static int qcow_create(const char *filename, QEMUOptionParameter *options) |
777 | { | |
778 | const char *backing_file = NULL; | |
779 | const char *backing_fmt = NULL; | |
780 | uint64_t sectors = 0; | |
781 | int flags = 0; | |
9ccb258e | 782 | size_t cluster_size = 65536; |
0e7e1989 KW |
783 | |
784 | /* Read out options */ | |
785 | while (options && options->name) { | |
786 | if (!strcmp(options->name, BLOCK_OPT_SIZE)) { | |
787 | sectors = options->value.n / 512; | |
788 | } else if (!strcmp(options->name, BLOCK_OPT_BACKING_FILE)) { | |
789 | backing_file = options->value.s; | |
790 | } else if (!strcmp(options->name, BLOCK_OPT_BACKING_FMT)) { | |
791 | backing_fmt = options->value.s; | |
792 | } else if (!strcmp(options->name, BLOCK_OPT_ENCRYPT)) { | |
793 | flags |= options->value.n ? BLOCK_FLAG_ENCRYPT : 0; | |
73c632ed KW |
794 | } else if (!strcmp(options->name, BLOCK_OPT_CLUSTER_SIZE)) { |
795 | if (options->value.n) { | |
796 | cluster_size = options->value.n; | |
797 | } | |
0e7e1989 KW |
798 | } |
799 | options++; | |
800 | } | |
801 | ||
73c632ed KW |
802 | return qcow_create2(filename, sectors, backing_file, backing_fmt, flags, |
803 | cluster_size); | |
f965509c AL |
804 | } |
805 | ||
585f8587 FB |
806 | static int qcow_make_empty(BlockDriverState *bs) |
807 | { | |
808 | #if 0 | |
809 | /* XXX: not correct */ | |
810 | BDRVQcowState *s = bs->opaque; | |
811 | uint32_t l1_length = s->l1_size * sizeof(uint64_t); | |
812 | int ret; | |
813 | ||
814 | memset(s->l1_table, 0, l1_length); | |
815 | if (bdrv_pwrite(s->hd, s->l1_table_offset, s->l1_table, l1_length) < 0) | |
ac674887 | 816 | return -1; |
585f8587 FB |
817 | ret = bdrv_truncate(s->hd, s->l1_table_offset + l1_length); |
818 | if (ret < 0) | |
819 | return ret; | |
3b46e624 | 820 | |
585f8587 FB |
821 | l2_cache_reset(bs); |
822 | #endif | |
823 | return 0; | |
824 | } | |
825 | ||
826 | /* XXX: put compressed sectors first, then all the cluster aligned | |
827 | tables to avoid losing bytes in alignment */ | |
5fafdf24 | 828 | static int qcow_write_compressed(BlockDriverState *bs, int64_t sector_num, |
585f8587 FB |
829 | const uint8_t *buf, int nb_sectors) |
830 | { | |
831 | BDRVQcowState *s = bs->opaque; | |
832 | z_stream strm; | |
833 | int ret, out_len; | |
834 | uint8_t *out_buf; | |
835 | uint64_t cluster_offset; | |
836 | ||
837 | if (nb_sectors == 0) { | |
838 | /* align end of file to a sector boundary to ease reading with | |
839 | sector based I/Os */ | |
840 | cluster_offset = bdrv_getlength(s->hd); | |
841 | cluster_offset = (cluster_offset + 511) & ~511; | |
842 | bdrv_truncate(s->hd, cluster_offset); | |
843 | return 0; | |
844 | } | |
845 | ||
846 | if (nb_sectors != s->cluster_sectors) | |
847 | return -EINVAL; | |
848 | ||
849 | out_buf = qemu_malloc(s->cluster_size + (s->cluster_size / 1000) + 128); | |
585f8587 FB |
850 | |
851 | /* best compression, small window, no zlib header */ | |
852 | memset(&strm, 0, sizeof(strm)); | |
853 | ret = deflateInit2(&strm, Z_DEFAULT_COMPRESSION, | |
5fafdf24 | 854 | Z_DEFLATED, -12, |
585f8587 FB |
855 | 9, Z_DEFAULT_STRATEGY); |
856 | if (ret != 0) { | |
857 | qemu_free(out_buf); | |
858 | return -1; | |
859 | } | |
860 | ||
861 | strm.avail_in = s->cluster_size; | |
862 | strm.next_in = (uint8_t *)buf; | |
863 | strm.avail_out = s->cluster_size; | |
864 | strm.next_out = out_buf; | |
865 | ||
866 | ret = deflate(&strm, Z_FINISH); | |
867 | if (ret != Z_STREAM_END && ret != Z_OK) { | |
868 | qemu_free(out_buf); | |
869 | deflateEnd(&strm); | |
870 | return -1; | |
871 | } | |
872 | out_len = strm.next_out - out_buf; | |
873 | ||
874 | deflateEnd(&strm); | |
875 | ||
876 | if (ret != Z_STREAM_END || out_len >= s->cluster_size) { | |
877 | /* could not compress: write normal cluster */ | |
ade40677 | 878 | bdrv_write(bs, sector_num, buf, s->cluster_sectors); |
585f8587 | 879 | } else { |
52d893ec AL |
880 | cluster_offset = alloc_compressed_cluster_offset(bs, sector_num << 9, |
881 | out_len); | |
882 | if (!cluster_offset) | |
883 | return -1; | |
585f8587 FB |
884 | cluster_offset &= s->cluster_offset_mask; |
885 | if (bdrv_pwrite(s->hd, cluster_offset, out_buf, out_len) != out_len) { | |
886 | qemu_free(out_buf); | |
887 | return -1; | |
888 | } | |
889 | } | |
3b46e624 | 890 | |
585f8587 FB |
891 | qemu_free(out_buf); |
892 | return 0; | |
893 | } | |
894 | ||
895 | static void qcow_flush(BlockDriverState *bs) | |
896 | { | |
897 | BDRVQcowState *s = bs->opaque; | |
898 | bdrv_flush(s->hd); | |
899 | } | |
900 | ||
901 | static int qcow_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) | |
902 | { | |
903 | BDRVQcowState *s = bs->opaque; | |
904 | bdi->cluster_size = s->cluster_size; | |
5fafdf24 | 905 | bdi->vm_state_offset = (int64_t)s->l1_vm_state_index << |
585f8587 FB |
906 | (s->cluster_bits + s->l2_bits); |
907 | return 0; | |
908 | } | |
909 | ||
585f8587 | 910 | |
e97fc193 AL |
911 | static int qcow_check(BlockDriverState *bs) |
912 | { | |
913 | return check_refcounts(bs); | |
585f8587 FB |
914 | } |
915 | ||
916 | #if 0 | |
917 | static void dump_refcounts(BlockDriverState *bs) | |
918 | { | |
919 | BDRVQcowState *s = bs->opaque; | |
920 | int64_t nb_clusters, k, k1, size; | |
921 | int refcount; | |
922 | ||
923 | size = bdrv_getlength(s->hd); | |
6db6c638 | 924 | nb_clusters = size_to_clusters(s, size); |
585f8587 FB |
925 | for(k = 0; k < nb_clusters;) { |
926 | k1 = k; | |
927 | refcount = get_refcount(bs, k); | |
928 | k++; | |
929 | while (k < nb_clusters && get_refcount(bs, k) == refcount) | |
930 | k++; | |
931 | printf("%lld: refcount=%d nb=%lld\n", k, refcount, k - k1); | |
932 | } | |
933 | } | |
934 | #endif | |
585f8587 | 935 | |
178e08a5 AL |
936 | static int qcow_put_buffer(BlockDriverState *bs, const uint8_t *buf, |
937 | int64_t pos, int size) | |
938 | { | |
939 | int growable = bs->growable; | |
940 | ||
941 | bs->growable = 1; | |
942 | bdrv_pwrite(bs, pos, buf, size); | |
943 | bs->growable = growable; | |
944 | ||
945 | return size; | |
946 | } | |
947 | ||
948 | static int qcow_get_buffer(BlockDriverState *bs, uint8_t *buf, | |
949 | int64_t pos, int size) | |
950 | { | |
951 | int growable = bs->growable; | |
952 | int ret; | |
953 | ||
954 | bs->growable = 1; | |
955 | ret = bdrv_pread(bs, pos, buf, size); | |
956 | bs->growable = growable; | |
957 | ||
958 | return ret; | |
959 | } | |
960 | ||
0e7e1989 | 961 | static QEMUOptionParameter qcow_create_options[] = { |
db08adf5 KW |
962 | { |
963 | .name = BLOCK_OPT_SIZE, | |
964 | .type = OPT_SIZE, | |
965 | .help = "Virtual disk size" | |
966 | }, | |
967 | { | |
968 | .name = BLOCK_OPT_BACKING_FILE, | |
969 | .type = OPT_STRING, | |
970 | .help = "File name of a base image" | |
971 | }, | |
972 | { | |
973 | .name = BLOCK_OPT_BACKING_FMT, | |
974 | .type = OPT_STRING, | |
975 | .help = "Image format of the base image" | |
976 | }, | |
977 | { | |
978 | .name = BLOCK_OPT_ENCRYPT, | |
979 | .type = OPT_FLAG, | |
980 | .help = "Encrypt the image" | |
981 | }, | |
982 | { | |
983 | .name = BLOCK_OPT_CLUSTER_SIZE, | |
984 | .type = OPT_SIZE, | |
985 | .help = "qcow2 cluster size" | |
986 | }, | |
0e7e1989 KW |
987 | { NULL } |
988 | }; | |
989 | ||
5efa9d5a | 990 | static BlockDriver bdrv_qcow2 = { |
e60f469c AJ |
991 | .format_name = "qcow2", |
992 | .instance_size = sizeof(BDRVQcowState), | |
993 | .bdrv_probe = qcow_probe, | |
994 | .bdrv_open = qcow_open, | |
995 | .bdrv_close = qcow_close, | |
996 | .bdrv_create = qcow_create, | |
997 | .bdrv_flush = qcow_flush, | |
998 | .bdrv_is_allocated = qcow_is_allocated, | |
999 | .bdrv_set_key = qcow_set_key, | |
1000 | .bdrv_make_empty = qcow_make_empty, | |
1001 | ||
f141eafe AL |
1002 | .bdrv_aio_readv = qcow_aio_readv, |
1003 | .bdrv_aio_writev = qcow_aio_writev, | |
585f8587 FB |
1004 | .bdrv_write_compressed = qcow_write_compressed, |
1005 | ||
1006 | .bdrv_snapshot_create = qcow_snapshot_create, | |
e60f469c | 1007 | .bdrv_snapshot_goto = qcow_snapshot_goto, |
585f8587 | 1008 | .bdrv_snapshot_delete = qcow_snapshot_delete, |
e60f469c AJ |
1009 | .bdrv_snapshot_list = qcow_snapshot_list, |
1010 | .bdrv_get_info = qcow_get_info, | |
f965509c | 1011 | |
178e08a5 AL |
1012 | .bdrv_put_buffer = qcow_put_buffer, |
1013 | .bdrv_get_buffer = qcow_get_buffer, | |
1014 | ||
0e7e1989 | 1015 | .create_options = qcow_create_options, |
e97fc193 | 1016 | .bdrv_check = qcow_check, |
585f8587 | 1017 | }; |
5efa9d5a AL |
1018 | |
1019 | static void bdrv_qcow2_init(void) | |
1020 | { | |
1021 | bdrv_register(&bdrv_qcow2); | |
1022 | } | |
1023 | ||
1024 | block_init(bdrv_qcow2_init); |