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KVM: Rework VCPU state writeback API
[qemu-kvm/amd-iommu.git] / block / vmdk.c
blob56c28a01038239277e73637018abffd79a15ad57
1 /*
2 * Block driver for the VMDK format
3 *
4 * Copyright (c) 2004 Fabrice Bellard
5 * Copyright (c) 2005 Filip Navara
6 *
7 * Permission is hereby granted, free of charge, to any person obtaining a copy
8 * of this software and associated documentation files (the "Software"), to deal
9 * in the Software without restriction, including without limitation the rights
10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
11 * copies of the Software, and to permit persons to whom the Software is
12 * furnished to do so, subject to the following conditions:
13 *
14 * The above copyright notice and this permission notice shall be included in
15 * all copies or substantial portions of the Software.
16 *
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
20 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
23 * THE SOFTWARE.
24 */
25
26 #include "qemu-common.h"
27 #include "block_int.h"
28 #include "module.h"
29
30 #define VMDK3_MAGIC (('C' << 24) | ('O' << 16) | ('W' << 8) | 'D')
31 #define VMDK4_MAGIC (('K' << 24) | ('D' << 16) | ('M' << 8) | 'V')
32
33 typedef struct {
34 uint32_t version;
35 uint32_t flags;
36 uint32_t disk_sectors;
37 uint32_t granularity;
38 uint32_t l1dir_offset;
39 uint32_t l1dir_size;
40 uint32_t file_sectors;
41 uint32_t cylinders;
42 uint32_t heads;
43 uint32_t sectors_per_track;
44 } VMDK3Header;
45
46 typedef struct {
47 uint32_t version;
48 uint32_t flags;
49 int64_t capacity;
50 int64_t granularity;
51 int64_t desc_offset;
52 int64_t desc_size;
53 int32_t num_gtes_per_gte;
54 int64_t rgd_offset;
55 int64_t gd_offset;
56 int64_t grain_offset;
57 char filler[1];
58 char check_bytes[4];
59 } __attribute__((packed)) VMDK4Header;
60
61 #define L2_CACHE_SIZE 16
62
63 typedef struct BDRVVmdkState {
64 BlockDriverState *hd;
65 int64_t l1_table_offset;
66 int64_t l1_backup_table_offset;
67 uint32_t *l1_table;
68 uint32_t *l1_backup_table;
69 unsigned int l1_size;
70 uint32_t l1_entry_sectors;
71
72 unsigned int l2_size;
73 uint32_t *l2_cache;
74 uint32_t l2_cache_offsets[L2_CACHE_SIZE];
75 uint32_t l2_cache_counts[L2_CACHE_SIZE];
76
77 unsigned int cluster_sectors;
78 uint32_t parent_cid;
79 int is_parent;
80 } BDRVVmdkState;
81
82 typedef struct VmdkMetaData {
83 uint32_t offset;
84 unsigned int l1_index;
85 unsigned int l2_index;
86 unsigned int l2_offset;
87 int valid;
88 } VmdkMetaData;
89
90 typedef struct ActiveBDRVState{
91 BlockDriverState *hd; // active image handler
92 uint64_t cluster_offset; // current write offset
93 }ActiveBDRVState;
94
95 static ActiveBDRVState activeBDRV;
96
97
98 static int vmdk_probe(const uint8_t *buf, int buf_size, const char *filename)
99 {
100 uint32_t magic;
101
102 if (buf_size < 4)
103 return 0;
104 magic = be32_to_cpu(*(uint32_t *)buf);
105 if (magic == VMDK3_MAGIC ||
106 magic == VMDK4_MAGIC)
107 return 100;
108 else
109 return 0;
110 }
111
112 #define CHECK_CID 1
113
114 #define SECTOR_SIZE 512
115 #define DESC_SIZE 20*SECTOR_SIZE // 20 sectors of 512 bytes each
116 #define HEADER_SIZE 512 // first sector of 512 bytes
117
118 static uint32_t vmdk_read_cid(BlockDriverState *bs, int parent)
119 {
120 BDRVVmdkState *s = bs->opaque;
121 char desc[DESC_SIZE];
122 uint32_t cid;
123 const char *p_name, *cid_str;
124 size_t cid_str_size;
125
126 /* the descriptor offset = 0x200 */
127 if (bdrv_pread(s->hd, 0x200, desc, DESC_SIZE) != DESC_SIZE)
128 return 0;
129
130 if (parent) {
131 cid_str = "parentCID";
132 cid_str_size = sizeof("parentCID");
133 } else {
134 cid_str = "CID";
135 cid_str_size = sizeof("CID");
136 }
137
138 if ((p_name = strstr(desc,cid_str)) != NULL) {
139 p_name += cid_str_size;
140 sscanf(p_name,"%x",&cid);
141 }
142
143 return cid;
144 }
145
146 static int vmdk_write_cid(BlockDriverState *bs, uint32_t cid)
147 {
148 BDRVVmdkState *s = bs->opaque;
149 char desc[DESC_SIZE], tmp_desc[DESC_SIZE];
150 char *p_name, *tmp_str;
151
152 /* the descriptor offset = 0x200 */
153 if (bdrv_pread(s->hd, 0x200, desc, DESC_SIZE) != DESC_SIZE)
154 return -1;
155
156 tmp_str = strstr(desc,"parentCID");
157 pstrcpy(tmp_desc, sizeof(tmp_desc), tmp_str);
158 if ((p_name = strstr(desc,"CID")) != NULL) {
159 p_name += sizeof("CID");
160 snprintf(p_name, sizeof(desc) - (p_name - desc), "%x\n", cid);
161 pstrcat(desc, sizeof(desc), tmp_desc);
162 }
163
164 if (bdrv_pwrite(s->hd, 0x200, desc, DESC_SIZE) != DESC_SIZE)
165 return -1;
166 return 0;
167 }
168
169 static int vmdk_is_cid_valid(BlockDriverState *bs)
170 {
171 #ifdef CHECK_CID
172 BDRVVmdkState *s = bs->opaque;
173 BlockDriverState *p_bs = bs->backing_hd;
174 uint32_t cur_pcid;
175
176 if (p_bs) {
177 cur_pcid = vmdk_read_cid(p_bs,0);
178 if (s->parent_cid != cur_pcid)
179 // CID not valid
180 return 0;
181 }
182 #endif
183 // CID valid
184 return 1;
185 }
186
187 static int vmdk_snapshot_create(const char *filename, const char *backing_file)
188 {
189 int snp_fd, p_fd;
190 uint32_t p_cid;
191 char *p_name, *gd_buf, *rgd_buf;
192 const char *real_filename, *temp_str;
193 VMDK4Header header;
194 uint32_t gde_entries, gd_size;
195 int64_t gd_offset, rgd_offset, capacity, gt_size;
196 char p_desc[DESC_SIZE], s_desc[DESC_SIZE], hdr[HEADER_SIZE];
197 static const char desc_template[] =
198 "# Disk DescriptorFile\n"
199 "version=1\n"
200 "CID=%x\n"
201 "parentCID=%x\n"
202 "createType=\"monolithicSparse\"\n"
203 "parentFileNameHint=\"%s\"\n"
204 "\n"
205 "# Extent description\n"
206 "RW %u SPARSE \"%s\"\n"
207 "\n"
208 "# The Disk Data Base \n"
209 "#DDB\n"
210 "\n";
211
212 snp_fd = open(filename, O_RDWR | O_CREAT | O_TRUNC | O_BINARY | O_LARGEFILE, 0644);
213 if (snp_fd < 0)
214 return -1;
215 p_fd = open(backing_file, O_RDONLY | O_BINARY | O_LARGEFILE);
216 if (p_fd < 0) {
217 close(snp_fd);
218 return -1;
219 }
220
221 /* read the header */
222 if (lseek(p_fd, 0x0, SEEK_SET) == -1)
223 goto fail;
224 if (read(p_fd, hdr, HEADER_SIZE) != HEADER_SIZE)
225 goto fail;
226
227 /* write the header */
228 if (lseek(snp_fd, 0x0, SEEK_SET) == -1)
229 goto fail;
230 if (write(snp_fd, hdr, HEADER_SIZE) == -1)
231 goto fail;
232
233 memset(&header, 0, sizeof(header));
234 memcpy(&header,&hdr[4], sizeof(header)); // skip the VMDK4_MAGIC
235
236 if (ftruncate(snp_fd, header.grain_offset << 9))
237 goto fail;
238 /* the descriptor offset = 0x200 */
239 if (lseek(p_fd, 0x200, SEEK_SET) == -1)
240 goto fail;
241 if (read(p_fd, p_desc, DESC_SIZE) != DESC_SIZE)
242 goto fail;
243
244 if ((p_name = strstr(p_desc,"CID")) != NULL) {
245 p_name += sizeof("CID");
246 sscanf(p_name,"%x",&p_cid);
247 }
248
249 real_filename = filename;
250 if ((temp_str = strrchr(real_filename, '\\')) != NULL)
251 real_filename = temp_str + 1;
252 if ((temp_str = strrchr(real_filename, '/')) != NULL)
253 real_filename = temp_str + 1;
254 if ((temp_str = strrchr(real_filename, ':')) != NULL)
255 real_filename = temp_str + 1;
256
257 snprintf(s_desc, sizeof(s_desc), desc_template, p_cid, p_cid, backing_file,
258 (uint32_t)header.capacity, real_filename);
259
260 /* write the descriptor */
261 if (lseek(snp_fd, 0x200, SEEK_SET) == -1)
262 goto fail;
263 if (write(snp_fd, s_desc, strlen(s_desc)) == -1)
264 goto fail;
265
266 gd_offset = header.gd_offset * SECTOR_SIZE; // offset of GD table
267 rgd_offset = header.rgd_offset * SECTOR_SIZE; // offset of RGD table
268 capacity = header.capacity * SECTOR_SIZE; // Extent size
269 /*
270 * Each GDE span 32M disk, means:
271 * 512 GTE per GT, each GTE points to grain
272 */
273 gt_size = (int64_t)header.num_gtes_per_gte * header.granularity * SECTOR_SIZE;
274 if (!gt_size)
275 goto fail;
276 gde_entries = (uint32_t)(capacity / gt_size); // number of gde/rgde
277 gd_size = gde_entries * sizeof(uint32_t);
278
279 /* write RGD */
280 rgd_buf = qemu_malloc(gd_size);
281 if (lseek(p_fd, rgd_offset, SEEK_SET) == -1)
282 goto fail_rgd;
283 if (read(p_fd, rgd_buf, gd_size) != gd_size)
284 goto fail_rgd;
285 if (lseek(snp_fd, rgd_offset, SEEK_SET) == -1)
286 goto fail_rgd;
287 if (write(snp_fd, rgd_buf, gd_size) == -1)
288 goto fail_rgd;
289 qemu_free(rgd_buf);
290
291 /* write GD */
292 gd_buf = qemu_malloc(gd_size);
293 if (lseek(p_fd, gd_offset, SEEK_SET) == -1)
294 goto fail_gd;
295 if (read(p_fd, gd_buf, gd_size) != gd_size)
296 goto fail_gd;
297 if (lseek(snp_fd, gd_offset, SEEK_SET) == -1)
298 goto fail_gd;
299 if (write(snp_fd, gd_buf, gd_size) == -1)
300 goto fail_gd;
301 qemu_free(gd_buf);
302
303 close(p_fd);
304 close(snp_fd);
305 return 0;
306
307 fail_gd:
308 qemu_free(gd_buf);
309 fail_rgd:
310 qemu_free(rgd_buf);
311 fail:
312 close(p_fd);
313 close(snp_fd);
314 return -1;
315 }
316
317 static void vmdk_parent_close(BlockDriverState *bs)
318 {
319 if (bs->backing_hd)
320 bdrv_close(bs->backing_hd);
321 }
322
323 static int parent_open = 0;
324 static int vmdk_parent_open(BlockDriverState *bs, const char * filename)
325 {
326 BDRVVmdkState *s = bs->opaque;
327 char *p_name;
328 char desc[DESC_SIZE];
329 char parent_img_name[1024];
330
331 /* the descriptor offset = 0x200 */
332 if (bdrv_pread(s->hd, 0x200, desc, DESC_SIZE) != DESC_SIZE)
333 return -1;
334
335 if ((p_name = strstr(desc,"parentFileNameHint")) != NULL) {
336 char *end_name;
337 struct stat file_buf;
338
339 p_name += sizeof("parentFileNameHint") + 1;
340 if ((end_name = strchr(p_name,'\"')) == NULL)
341 return -1;
342 if ((end_name - p_name) > sizeof (bs->backing_file) - 1)
343 return -1;
344
345 pstrcpy(bs->backing_file, end_name - p_name + 1, p_name);
346 if (stat(bs->backing_file, &file_buf) != 0) {
347 path_combine(parent_img_name, sizeof(parent_img_name),
348 filename, bs->backing_file);
349 } else {
350 pstrcpy(parent_img_name, sizeof(parent_img_name),
351 bs->backing_file);
352 }
353
354 bs->backing_hd = bdrv_new("");
355 if (!bs->backing_hd) {
356 failure:
357 bdrv_close(s->hd);
358 return -1;
359 }
360 parent_open = 1;
361 if (bdrv_open(bs->backing_hd, parent_img_name, 0) < 0)
362 goto failure;
363 parent_open = 0;
364 }
365
366 return 0;
367 }
368
369 static int vmdk_open(BlockDriverState *bs, const char *filename, int flags)
370 {
371 BDRVVmdkState *s = bs->opaque;
372 uint32_t magic;
373 int l1_size, i, ret;
374
375 if (parent_open) {
376 /* Parent must be opened as RO, no RDWR. */
377 flags = 0;
378 }
379
380 ret = bdrv_file_open(&s->hd, filename, flags);
381 if (ret < 0)
382 return ret;
383 if (bdrv_pread(s->hd, 0, &magic, sizeof(magic)) != sizeof(magic))
384 goto fail;
385
386 magic = be32_to_cpu(magic);
387 if (magic == VMDK3_MAGIC) {
388 VMDK3Header header;
389
390 if (bdrv_pread(s->hd, sizeof(magic), &header, sizeof(header)) != sizeof(header))
391 goto fail;
392 s->cluster_sectors = le32_to_cpu(header.granularity);
393 s->l2_size = 1 << 9;
394 s->l1_size = 1 << 6;
395 bs->total_sectors = le32_to_cpu(header.disk_sectors);
396 s->l1_table_offset = le32_to_cpu(header.l1dir_offset) << 9;
397 s->l1_backup_table_offset = 0;
398 s->l1_entry_sectors = s->l2_size * s->cluster_sectors;
399 } else if (magic == VMDK4_MAGIC) {
400 VMDK4Header header;
401
402 if (bdrv_pread(s->hd, sizeof(magic), &header, sizeof(header)) != sizeof(header))
403 goto fail;
404 bs->total_sectors = le64_to_cpu(header.capacity);
405 s->cluster_sectors = le64_to_cpu(header.granularity);
406 s->l2_size = le32_to_cpu(header.num_gtes_per_gte);
407 s->l1_entry_sectors = s->l2_size * s->cluster_sectors;
408 if (s->l1_entry_sectors <= 0)
409 goto fail;
410 s->l1_size = (bs->total_sectors + s->l1_entry_sectors - 1)
411 / s->l1_entry_sectors;
412 s->l1_table_offset = le64_to_cpu(header.rgd_offset) << 9;
413 s->l1_backup_table_offset = le64_to_cpu(header.gd_offset) << 9;
414
415 if (parent_open)
416 s->is_parent = 1;
417 else
418 s->is_parent = 0;
419
420 // try to open parent images, if exist
421 if (vmdk_parent_open(bs, filename) != 0)
422 goto fail;
423 // write the CID once after the image creation
424 s->parent_cid = vmdk_read_cid(bs,1);
425 } else {
426 goto fail;
427 }
428
429 /* read the L1 table */
430 l1_size = s->l1_size * sizeof(uint32_t);
431 s->l1_table = qemu_malloc(l1_size);
432 if (bdrv_pread(s->hd, s->l1_table_offset, s->l1_table, l1_size) != l1_size)
433 goto fail;
434 for(i = 0; i < s->l1_size; i++) {
435 le32_to_cpus(&s->l1_table[i]);
436 }
437
438 if (s->l1_backup_table_offset) {
439 s->l1_backup_table = qemu_malloc(l1_size);
440 if (bdrv_pread(s->hd, s->l1_backup_table_offset, s->l1_backup_table, l1_size) != l1_size)
441 goto fail;
442 for(i = 0; i < s->l1_size; i++) {
443 le32_to_cpus(&s->l1_backup_table[i]);
444 }
445 }
446
447 s->l2_cache = qemu_malloc(s->l2_size * L2_CACHE_SIZE * sizeof(uint32_t));
448 return 0;
449 fail:
450 qemu_free(s->l1_backup_table);
451 qemu_free(s->l1_table);
452 qemu_free(s->l2_cache);
453 bdrv_delete(s->hd);
454 return -1;
455 }
456
457 static uint64_t get_cluster_offset(BlockDriverState *bs, VmdkMetaData *m_data,
458 uint64_t offset, int allocate);
459
460 static int get_whole_cluster(BlockDriverState *bs, uint64_t cluster_offset,
461 uint64_t offset, int allocate)
462 {
463 uint64_t parent_cluster_offset;
464 BDRVVmdkState *s = bs->opaque;
465 uint8_t whole_grain[s->cluster_sectors*512]; // 128 sectors * 512 bytes each = grain size 64KB
466
467 // we will be here if it's first write on non-exist grain(cluster).
468 // try to read from parent image, if exist
469 if (bs->backing_hd) {
470 BDRVVmdkState *ps = bs->backing_hd->opaque;
471
472 if (!vmdk_is_cid_valid(bs))
473 return -1;
474
475 parent_cluster_offset = get_cluster_offset(bs->backing_hd, NULL,
476 offset, allocate);
477
478 if (parent_cluster_offset) {
479 BDRVVmdkState *act_s = activeBDRV.hd->opaque;
480
481 if (bdrv_pread(ps->hd, parent_cluster_offset, whole_grain, ps->cluster_sectors*512) != ps->cluster_sectors*512)
482 return -1;
483
484 //Write grain only into the active image
485 if (bdrv_pwrite(act_s->hd, activeBDRV.cluster_offset << 9, whole_grain, sizeof(whole_grain)) != sizeof(whole_grain))
486 return -1;
487 }
488 }
489 return 0;
490 }
491
492 static int vmdk_L2update(BlockDriverState *bs, VmdkMetaData *m_data)
493 {
494 BDRVVmdkState *s = bs->opaque;
495
496 /* update L2 table */
497 if (bdrv_pwrite(s->hd, ((int64_t)m_data->l2_offset * 512) + (m_data->l2_index * sizeof(m_data->offset)),
498 &(m_data->offset), sizeof(m_data->offset)) != sizeof(m_data->offset))
499 return -1;
500 /* update backup L2 table */
501 if (s->l1_backup_table_offset != 0) {
502 m_data->l2_offset = s->l1_backup_table[m_data->l1_index];
503 if (bdrv_pwrite(s->hd, ((int64_t)m_data->l2_offset * 512) + (m_data->l2_index * sizeof(m_data->offset)),
504 &(m_data->offset), sizeof(m_data->offset)) != sizeof(m_data->offset))
505 return -1;
506 }
507
508 return 0;
509 }
510
511 static uint64_t get_cluster_offset(BlockDriverState *bs, VmdkMetaData *m_data,
512 uint64_t offset, int allocate)
513 {
514 BDRVVmdkState *s = bs->opaque;
515 unsigned int l1_index, l2_offset, l2_index;
516 int min_index, i, j;
517 uint32_t min_count, *l2_table, tmp = 0;
518 uint64_t cluster_offset;
519
520 if (m_data)
521 m_data->valid = 0;
522
523 l1_index = (offset >> 9) / s->l1_entry_sectors;
524 if (l1_index >= s->l1_size)
525 return 0;
526 l2_offset = s->l1_table[l1_index];
527 if (!l2_offset)
528 return 0;
529 for(i = 0; i < L2_CACHE_SIZE; i++) {
530 if (l2_offset == s->l2_cache_offsets[i]) {
531 /* increment the hit count */
532 if (++s->l2_cache_counts[i] == 0xffffffff) {
533 for(j = 0; j < L2_CACHE_SIZE; j++) {
534 s->l2_cache_counts[j] >>= 1;
535 }
536 }
537 l2_table = s->l2_cache + (i * s->l2_size);
538 goto found;
539 }
540 }
541 /* not found: load a new entry in the least used one */
542 min_index = 0;
543 min_count = 0xffffffff;
544 for(i = 0; i < L2_CACHE_SIZE; i++) {
545 if (s->l2_cache_counts[i] < min_count) {
546 min_count = s->l2_cache_counts[i];
547 min_index = i;
548 }
549 }
550 l2_table = s->l2_cache + (min_index * s->l2_size);
551 if (bdrv_pread(s->hd, (int64_t)l2_offset * 512, l2_table, s->l2_size * sizeof(uint32_t)) !=
552 s->l2_size * sizeof(uint32_t))
553 return 0;
554
555 s->l2_cache_offsets[min_index] = l2_offset;
556 s->l2_cache_counts[min_index] = 1;
557 found:
558 l2_index = ((offset >> 9) / s->cluster_sectors) % s->l2_size;
559 cluster_offset = le32_to_cpu(l2_table[l2_index]);
560
561 if (!cluster_offset) {
562 if (!allocate)
563 return 0;
564 // Avoid the L2 tables update for the images that have snapshots.
565 if (!s->is_parent) {
566 cluster_offset = bdrv_getlength(s->hd);
567 bdrv_truncate(s->hd, cluster_offset + (s->cluster_sectors << 9));
568
569 cluster_offset >>= 9;
570 tmp = cpu_to_le32(cluster_offset);
571 l2_table[l2_index] = tmp;
572 // Save the active image state
573 activeBDRV.cluster_offset = cluster_offset;
574 activeBDRV.hd = bs;
575 }
576 /* First of all we write grain itself, to avoid race condition
577 * that may to corrupt the image.
578 * This problem may occur because of insufficient space on host disk
579 * or inappropriate VM shutdown.
580 */
581 if (get_whole_cluster(bs, cluster_offset, offset, allocate) == -1)
582 return 0;
583
584 if (m_data) {
585 m_data->offset = tmp;
586 m_data->l1_index = l1_index;
587 m_data->l2_index = l2_index;
588 m_data->l2_offset = l2_offset;
589 m_data->valid = 1;
590 }
591 }
592 cluster_offset <<= 9;
593 return cluster_offset;
594 }
595
596 static int vmdk_is_allocated(BlockDriverState *bs, int64_t sector_num,
597 int nb_sectors, int *pnum)
598 {
599 BDRVVmdkState *s = bs->opaque;
600 int index_in_cluster, n;
601 uint64_t cluster_offset;
602
603 cluster_offset = get_cluster_offset(bs, NULL, sector_num << 9, 0);
604 index_in_cluster = sector_num % s->cluster_sectors;
605 n = s->cluster_sectors - index_in_cluster;
606 if (n > nb_sectors)
607 n = nb_sectors;
608 *pnum = n;
609 return (cluster_offset != 0);
610 }
611
612 static int vmdk_read(BlockDriverState *bs, int64_t sector_num,
613 uint8_t *buf, int nb_sectors)
614 {
615 BDRVVmdkState *s = bs->opaque;
616 int index_in_cluster, n, ret;
617 uint64_t cluster_offset;
618
619 while (nb_sectors > 0) {
620 cluster_offset = get_cluster_offset(bs, NULL, sector_num << 9, 0);
621 index_in_cluster = sector_num % s->cluster_sectors;
622 n = s->cluster_sectors - index_in_cluster;
623 if (n > nb_sectors)
624 n = nb_sectors;
625 if (!cluster_offset) {
626 // try to read from parent image, if exist
627 if (bs->backing_hd) {
628 if (!vmdk_is_cid_valid(bs))
629 return -1;
630 ret = bdrv_read(bs->backing_hd, sector_num, buf, n);
631 if (ret < 0)
632 return -1;
633 } else {
634 memset(buf, 0, 512 * n);
635 }
636 } else {
637 if(bdrv_pread(s->hd, cluster_offset + index_in_cluster * 512, buf, n * 512) != n * 512)
638 return -1;
639 }
640 nb_sectors -= n;
641 sector_num += n;
642 buf += n * 512;
643 }
644 return 0;
645 }
646
647 static int vmdk_write(BlockDriverState *bs, int64_t sector_num,
648 const uint8_t *buf, int nb_sectors)
649 {
650 BDRVVmdkState *s = bs->opaque;
651 VmdkMetaData m_data;
652 int index_in_cluster, n;
653 uint64_t cluster_offset;
654 static int cid_update = 0;
655
656 if (sector_num > bs->total_sectors) {
657 fprintf(stderr,
658 "(VMDK) Wrong offset: sector_num=0x%" PRIx64
659 " total_sectors=0x%" PRIx64 "\n",
660 sector_num, bs->total_sectors);
661 return -1;
662 }
663
664 while (nb_sectors > 0) {
665 index_in_cluster = sector_num & (s->cluster_sectors - 1);
666 n = s->cluster_sectors - index_in_cluster;
667 if (n > nb_sectors)
668 n = nb_sectors;
669 cluster_offset = get_cluster_offset(bs, &m_data, sector_num << 9, 1);
670 if (!cluster_offset)
671 return -1;
672
673 if (bdrv_pwrite(s->hd, cluster_offset + index_in_cluster * 512, buf, n * 512) != n * 512)
674 return -1;
675 if (m_data.valid) {
676 /* update L2 tables */
677 if (vmdk_L2update(bs, &m_data) == -1)
678 return -1;
679 }
680 nb_sectors -= n;
681 sector_num += n;
682 buf += n * 512;
683
684 // update CID on the first write every time the virtual disk is opened
685 if (!cid_update) {
686 vmdk_write_cid(bs, time(NULL));
687 cid_update++;
688 }
689 }
690 return 0;
691 }
692
693 static int vmdk_create(const char *filename, QEMUOptionParameter *options)
694 {
695 int fd, i;
696 VMDK4Header header;
697 uint32_t tmp, magic, grains, gd_size, gt_size, gt_count;
698 static const char desc_template[] =
699 "# Disk DescriptorFile\n"
700 "version=1\n"
701 "CID=%x\n"
702 "parentCID=ffffffff\n"
703 "createType=\"monolithicSparse\"\n"
704 "\n"
705 "# Extent description\n"
706 "RW %" PRId64 " SPARSE \"%s\"\n"
707 "\n"
708 "# The Disk Data Base \n"
709 "#DDB\n"
710 "\n"
711 "ddb.virtualHWVersion = \"%d\"\n"
712 "ddb.geometry.cylinders = \"%" PRId64 "\"\n"
713 "ddb.geometry.heads = \"16\"\n"
714 "ddb.geometry.sectors = \"63\"\n"
715 "ddb.adapterType = \"ide\"\n";
716 char desc[1024];
717 const char *real_filename, *temp_str;
718 int64_t total_size = 0;
719 const char *backing_file = NULL;
720 int flags = 0;
721 int ret;
722
723 // Read out options
724 while (options && options->name) {
725 if (!strcmp(options->name, BLOCK_OPT_SIZE)) {
726 total_size = options->value.n / 512;
727 } else if (!strcmp(options->name, BLOCK_OPT_BACKING_FILE)) {
728 backing_file = options->value.s;
729 } else if (!strcmp(options->name, BLOCK_OPT_COMPAT6)) {
730 flags |= options->value.n ? BLOCK_FLAG_COMPAT6: 0;
731 }
732 options++;
733 }
734
735 /* XXX: add support for backing file */
736 if (backing_file) {
737 return vmdk_snapshot_create(filename, backing_file);
738 }
739
740 fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY | O_LARGEFILE,
741 0644);
742 if (fd < 0)
743 return -1;
744 magic = cpu_to_be32(VMDK4_MAGIC);
745 memset(&header, 0, sizeof(header));
746 header.version = cpu_to_le32(1);
747 header.flags = cpu_to_le32(3); /* ?? */
748 header.capacity = cpu_to_le64(total_size);
749 header.granularity = cpu_to_le64(128);
750 header.num_gtes_per_gte = cpu_to_le32(512);
751
752 grains = (total_size + header.granularity - 1) / header.granularity;
753 gt_size = ((header.num_gtes_per_gte * sizeof(uint32_t)) + 511) >> 9;
754 gt_count = (grains + header.num_gtes_per_gte - 1) / header.num_gtes_per_gte;
755 gd_size = (gt_count * sizeof(uint32_t) + 511) >> 9;
756
757 header.desc_offset = 1;
758 header.desc_size = 20;
759 header.rgd_offset = header.desc_offset + header.desc_size;
760 header.gd_offset = header.rgd_offset + gd_size + (gt_size * gt_count);
761 header.grain_offset =
762 ((header.gd_offset + gd_size + (gt_size * gt_count) +
763 header.granularity - 1) / header.granularity) *
764 header.granularity;
765
766 header.desc_offset = cpu_to_le64(header.desc_offset);
767 header.desc_size = cpu_to_le64(header.desc_size);
768 header.rgd_offset = cpu_to_le64(header.rgd_offset);
769 header.gd_offset = cpu_to_le64(header.gd_offset);
770 header.grain_offset = cpu_to_le64(header.grain_offset);
771
772 header.check_bytes[0] = 0xa;
773 header.check_bytes[1] = 0x20;
774 header.check_bytes[2] = 0xd;
775 header.check_bytes[3] = 0xa;
776
777 /* write all the data */
778 ret = qemu_write_full(fd, &magic, sizeof(magic));
779 if (ret != sizeof(magic)) {
780 ret = -1;
781 goto exit;
782 }
783 ret = qemu_write_full(fd, &header, sizeof(header));
784 if (ret != sizeof(header)) {
785 ret = -1;
786 goto exit;
787 }
788
789 ret = ftruncate(fd, header.grain_offset << 9);
790 if (ret < 0) {
791 ret = -1;
792 goto exit;
793 }
794
795 /* write grain directory */
796 lseek(fd, le64_to_cpu(header.rgd_offset) << 9, SEEK_SET);
797 for (i = 0, tmp = header.rgd_offset + gd_size;
798 i < gt_count; i++, tmp += gt_size) {
799 ret = qemu_write_full(fd, &tmp, sizeof(tmp));
800 if (ret != sizeof(tmp)) {
801 ret = -1;
802 goto exit;
803 }
804 }
805
806 /* write backup grain directory */
807 lseek(fd, le64_to_cpu(header.gd_offset) << 9, SEEK_SET);
808 for (i = 0, tmp = header.gd_offset + gd_size;
809 i < gt_count; i++, tmp += gt_size) {
810 ret = qemu_write_full(fd, &tmp, sizeof(tmp));
811 if (ret != sizeof(tmp)) {
812 ret = -1;
813 goto exit;
814 }
815 }
816
817 /* compose the descriptor */
818 real_filename = filename;
819 if ((temp_str = strrchr(real_filename, '\\')) != NULL)
820 real_filename = temp_str + 1;
821 if ((temp_str = strrchr(real_filename, '/')) != NULL)
822 real_filename = temp_str + 1;
823 if ((temp_str = strrchr(real_filename, ':')) != NULL)
824 real_filename = temp_str + 1;
825 snprintf(desc, sizeof(desc), desc_template, (unsigned int)time(NULL),
826 total_size, real_filename,
827 (flags & BLOCK_FLAG_COMPAT6 ? 6 : 4),
828 total_size / (int64_t)(63 * 16));
829
830 /* write the descriptor */
831 lseek(fd, le64_to_cpu(header.desc_offset) << 9, SEEK_SET);
832 ret = qemu_write_full(fd, desc, strlen(desc));
833 if (ret != strlen(desc)) {
834 ret = -1;
835 goto exit;
836 }
837
838 ret = 0;
839 exit:
840 close(fd);
841 return ret;
842 }
843
844 static void vmdk_close(BlockDriverState *bs)
845 {
846 BDRVVmdkState *s = bs->opaque;
847
848 qemu_free(s->l1_table);
849 qemu_free(s->l2_cache);
850 // try to close parent image, if exist
851 vmdk_parent_close(s->hd);
852 bdrv_delete(s->hd);
853 }
854
855 static void vmdk_flush(BlockDriverState *bs)
856 {
857 BDRVVmdkState *s = bs->opaque;
858 bdrv_flush(s->hd);
859 }
860
861
862 static QEMUOptionParameter vmdk_create_options[] = {
863 {
864 .name = BLOCK_OPT_SIZE,
865 .type = OPT_SIZE,
866 .help = "Virtual disk size"
867 },
868 {
869 .name = BLOCK_OPT_BACKING_FILE,
870 .type = OPT_STRING,
871 .help = "File name of a base image"
872 },
873 {
874 .name = BLOCK_OPT_COMPAT6,
875 .type = OPT_FLAG,
876 .help = "VMDK version 6 image"
877 },
878 { NULL }
879 };
880
881 static BlockDriver bdrv_vmdk = {
882 .format_name = "vmdk",
883 .instance_size = sizeof(BDRVVmdkState),
884 .bdrv_probe = vmdk_probe,
885 .bdrv_open = vmdk_open,
886 .bdrv_read = vmdk_read,
887 .bdrv_write = vmdk_write,
888 .bdrv_close = vmdk_close,
889 .bdrv_create = vmdk_create,
890 .bdrv_flush = vmdk_flush,
891 .bdrv_is_allocated = vmdk_is_allocated,
892
893 .create_options = vmdk_create_options,
894 };
895
896 static void bdrv_vmdk_init(void)
897 {
898 bdrv_register(&bdrv_vmdk);
899 }
900
901 block_init(bdrv_vmdk_init);
AMD IOMMU emulation for KVM