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