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