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block.c: adding bdrv_co_delete_file
[qemu/ar7.git] / block / vmdk.c
blob20e909d9979486f8e9e9ac26f7a8cc72a416ac0e
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/osdep.h"
27 #include "qapi/error.h"
28 #include "block/block_int.h"
29 #include "sysemu/block-backend.h"
30 #include "qapi/qmp/qdict.h"
31 #include "qapi/qmp/qerror.h"
32 #include "qemu/error-report.h"
33 #include "qemu/module.h"
34 #include "qemu/option.h"
35 #include "qemu/bswap.h"
36 #include "migration/blocker.h"
37 #include "qemu/cutils.h"
38 #include <zlib.h>
39
40 #define VMDK3_MAGIC (('C' << 24) | ('O' << 16) | ('W' << 8) | 'D')
41 #define VMDK4_MAGIC (('K' << 24) | ('D' << 16) | ('M' << 8) | 'V')
42 #define VMDK4_COMPRESSION_DEFLATE 1
43 #define VMDK4_FLAG_NL_DETECT (1 << 0)
44 #define VMDK4_FLAG_RGD (1 << 1)
45 /* Zeroed-grain enable bit */
46 #define VMDK4_FLAG_ZERO_GRAIN (1 << 2)
47 #define VMDK4_FLAG_COMPRESS (1 << 16)
48 #define VMDK4_FLAG_MARKER (1 << 17)
49 #define VMDK4_GD_AT_END 0xffffffffffffffffULL
50
51 #define VMDK_EXTENT_MAX_SECTORS (1ULL << 32)
52
53 #define VMDK_GTE_ZEROED 0x1
54
55 /* VMDK internal error codes */
56 #define VMDK_OK 0
57 #define VMDK_ERROR (-1)
58 /* Cluster not allocated */
59 #define VMDK_UNALLOC (-2)
60 #define VMDK_ZEROED (-3)
61
62 #define BLOCK_OPT_ZEROED_GRAIN "zeroed_grain"
63
64 typedef struct {
65 uint32_t version;
66 uint32_t flags;
67 uint32_t disk_sectors;
68 uint32_t granularity;
69 uint32_t l1dir_offset;
70 uint32_t l1dir_size;
71 uint32_t file_sectors;
72 uint32_t cylinders;
73 uint32_t heads;
74 uint32_t sectors_per_track;
75 } QEMU_PACKED VMDK3Header;
76
77 typedef struct {
78 uint32_t version;
79 uint32_t flags;
80 uint64_t capacity;
81 uint64_t granularity;
82 uint64_t desc_offset;
83 uint64_t desc_size;
84 /* Number of GrainTableEntries per GrainTable */
85 uint32_t num_gtes_per_gt;
86 uint64_t rgd_offset;
87 uint64_t gd_offset;
88 uint64_t grain_offset;
89 char filler[1];
90 char check_bytes[4];
91 uint16_t compressAlgorithm;
92 } QEMU_PACKED VMDK4Header;
93
94 typedef struct VMDKSESparseConstHeader {
95 uint64_t magic;
96 uint64_t version;
97 uint64_t capacity;
98 uint64_t grain_size;
99 uint64_t grain_table_size;
100 uint64_t flags;
101 uint64_t reserved1;
102 uint64_t reserved2;
103 uint64_t reserved3;
104 uint64_t reserved4;
105 uint64_t volatile_header_offset;
106 uint64_t volatile_header_size;
107 uint64_t journal_header_offset;
108 uint64_t journal_header_size;
109 uint64_t journal_offset;
110 uint64_t journal_size;
111 uint64_t grain_dir_offset;
112 uint64_t grain_dir_size;
113 uint64_t grain_tables_offset;
114 uint64_t grain_tables_size;
115 uint64_t free_bitmap_offset;
116 uint64_t free_bitmap_size;
117 uint64_t backmap_offset;
118 uint64_t backmap_size;
119 uint64_t grains_offset;
120 uint64_t grains_size;
121 uint8_t pad[304];
122 } QEMU_PACKED VMDKSESparseConstHeader;
123
124 typedef struct VMDKSESparseVolatileHeader {
125 uint64_t magic;
126 uint64_t free_gt_number;
127 uint64_t next_txn_seq_number;
128 uint64_t replay_journal;
129 uint8_t pad[480];
130 } QEMU_PACKED VMDKSESparseVolatileHeader;
131
132 #define L2_CACHE_SIZE 16
133
134 typedef struct VmdkExtent {
135 BdrvChild *file;
136 bool flat;
137 bool compressed;
138 bool has_marker;
139 bool has_zero_grain;
140 bool sesparse;
141 uint64_t sesparse_l2_tables_offset;
142 uint64_t sesparse_clusters_offset;
143 int32_t entry_size;
144 int version;
145 int64_t sectors;
146 int64_t end_sector;
147 int64_t flat_start_offset;
148 int64_t l1_table_offset;
149 int64_t l1_backup_table_offset;
150 void *l1_table;
151 uint32_t *l1_backup_table;
152 unsigned int l1_size;
153 uint32_t l1_entry_sectors;
154
155 unsigned int l2_size;
156 void *l2_cache;
157 uint32_t l2_cache_offsets[L2_CACHE_SIZE];
158 uint32_t l2_cache_counts[L2_CACHE_SIZE];
159
160 int64_t cluster_sectors;
161 int64_t next_cluster_sector;
162 char *type;
163 } VmdkExtent;
164
165 typedef struct BDRVVmdkState {
166 CoMutex lock;
167 uint64_t desc_offset;
168 bool cid_updated;
169 bool cid_checked;
170 uint32_t cid;
171 uint32_t parent_cid;
172 int num_extents;
173 /* Extent array with num_extents entries, ascend ordered by address */
174 VmdkExtent *extents;
175 Error *migration_blocker;
176 char *create_type;
177 } BDRVVmdkState;
178
179 typedef struct VmdkMetaData {
180 unsigned int l1_index;
181 unsigned int l2_index;
182 unsigned int l2_offset;
183 int valid;
184 uint32_t *l2_cache_entry;
185 } VmdkMetaData;
186
187 typedef struct VmdkGrainMarker {
188 uint64_t lba;
189 uint32_t size;
190 uint8_t data[0];
191 } QEMU_PACKED VmdkGrainMarker;
192
193 enum {
194 MARKER_END_OF_STREAM = 0,
195 MARKER_GRAIN_TABLE = 1,
196 MARKER_GRAIN_DIRECTORY = 2,
197 MARKER_FOOTER = 3,
198 };
199
200 static int vmdk_probe(const uint8_t *buf, int buf_size, const char *filename)
201 {
202 uint32_t magic;
203
204 if (buf_size < 4) {
205 return 0;
206 }
207 magic = be32_to_cpu(*(uint32_t *)buf);
208 if (magic == VMDK3_MAGIC ||
209 magic == VMDK4_MAGIC) {
210 return 100;
211 } else {
212 const char *p = (const char *)buf;
213 const char *end = p + buf_size;
214 while (p < end) {
215 if (*p == '#') {
216 /* skip comment line */
217 while (p < end && *p != '\n') {
218 p++;
219 }
220 p++;
221 continue;
222 }
223 if (*p == ' ') {
224 while (p < end && *p == ' ') {
225 p++;
226 }
227 /* skip '\r' if windows line endings used. */
228 if (p < end && *p == '\r') {
229 p++;
230 }
231 /* only accept blank lines before 'version=' line */
232 if (p == end || *p != '\n') {
233 return 0;
234 }
235 p++;
236 continue;
237 }
238 if (end - p >= strlen("version=X\n")) {
239 if (strncmp("version=1\n", p, strlen("version=1\n")) == 0 ||
240 strncmp("version=2\n", p, strlen("version=2\n")) == 0 ||
241 strncmp("version=3\n", p, strlen("version=3\n")) == 0) {
242 return 100;
243 }
244 }
245 if (end - p >= strlen("version=X\r\n")) {
246 if (strncmp("version=1\r\n", p, strlen("version=1\r\n")) == 0 ||
247 strncmp("version=2\r\n", p, strlen("version=2\r\n")) == 0 ||
248 strncmp("version=3\r\n", p, strlen("version=3\r\n")) == 0) {
249 return 100;
250 }
251 }
252 return 0;
253 }
254 return 0;
255 }
256 }
257
258 #define SECTOR_SIZE 512
259 #define DESC_SIZE (20 * SECTOR_SIZE) /* 20 sectors of 512 bytes each */
260 #define BUF_SIZE 4096
261 #define HEADER_SIZE 512 /* first sector of 512 bytes */
262
263 static void vmdk_free_extents(BlockDriverState *bs)
264 {
265 int i;
266 BDRVVmdkState *s = bs->opaque;
267 VmdkExtent *e;
268
269 for (i = 0; i < s->num_extents; i++) {
270 e = &s->extents[i];
271 g_free(e->l1_table);
272 g_free(e->l2_cache);
273 g_free(e->l1_backup_table);
274 g_free(e->type);
275 if (e->file != bs->file) {
276 bdrv_unref_child(bs, e->file);
277 }
278 }
279 g_free(s->extents);
280 }
281
282 static void vmdk_free_last_extent(BlockDriverState *bs)
283 {
284 BDRVVmdkState *s = bs->opaque;
285
286 if (s->num_extents == 0) {
287 return;
288 }
289 s->num_extents--;
290 s->extents = g_renew(VmdkExtent, s->extents, s->num_extents);
291 }
292
293 /* Return -ve errno, or 0 on success and write CID into *pcid. */
294 static int vmdk_read_cid(BlockDriverState *bs, int parent, uint32_t *pcid)
295 {
296 char *desc;
297 uint32_t cid;
298 const char *p_name, *cid_str;
299 size_t cid_str_size;
300 BDRVVmdkState *s = bs->opaque;
301 int ret;
302
303 desc = g_malloc0(DESC_SIZE);
304 ret = bdrv_pread(bs->file, s->desc_offset, desc, DESC_SIZE);
305 if (ret < 0) {
306 goto out;
307 }
308
309 if (parent) {
310 cid_str = "parentCID";
311 cid_str_size = sizeof("parentCID");
312 } else {
313 cid_str = "CID";
314 cid_str_size = sizeof("CID");
315 }
316
317 desc[DESC_SIZE - 1] = '\0';
318 p_name = strstr(desc, cid_str);
319 if (p_name == NULL) {
320 ret = -EINVAL;
321 goto out;
322 }
323 p_name += cid_str_size;
324 if (sscanf(p_name, "%" SCNx32, &cid) != 1) {
325 ret = -EINVAL;
326 goto out;
327 }
328 *pcid = cid;
329 ret = 0;
330
331 out:
332 g_free(desc);
333 return ret;
334 }
335
336 static int vmdk_write_cid(BlockDriverState *bs, uint32_t cid)
337 {
338 char *desc, *tmp_desc;
339 char *p_name, *tmp_str;
340 BDRVVmdkState *s = bs->opaque;
341 int ret = 0;
342
343 desc = g_malloc0(DESC_SIZE);
344 tmp_desc = g_malloc0(DESC_SIZE);
345 ret = bdrv_pread(bs->file, s->desc_offset, desc, DESC_SIZE);
346 if (ret < 0) {
347 goto out;
348 }
349
350 desc[DESC_SIZE - 1] = '\0';
351 tmp_str = strstr(desc, "parentCID");
352 if (tmp_str == NULL) {
353 ret = -EINVAL;
354 goto out;
355 }
356
357 pstrcpy(tmp_desc, DESC_SIZE, tmp_str);
358 p_name = strstr(desc, "CID");
359 if (p_name != NULL) {
360 p_name += sizeof("CID");
361 snprintf(p_name, DESC_SIZE - (p_name - desc), "%" PRIx32 "\n", cid);
362 pstrcat(desc, DESC_SIZE, tmp_desc);
363 }
364
365 ret = bdrv_pwrite_sync(bs->file, s->desc_offset, desc, DESC_SIZE);
366
367 out:
368 g_free(desc);
369 g_free(tmp_desc);
370 return ret;
371 }
372
373 static int vmdk_is_cid_valid(BlockDriverState *bs)
374 {
375 BDRVVmdkState *s = bs->opaque;
376 uint32_t cur_pcid;
377
378 if (!s->cid_checked && bs->backing) {
379 BlockDriverState *p_bs = bs->backing->bs;
380
381 if (strcmp(p_bs->drv->format_name, "vmdk")) {
382 /* Backing file is not in vmdk format, so it does not have
383 * a CID, which makes the overlay's parent CID invalid */
384 return 0;
385 }
386
387 if (vmdk_read_cid(p_bs, 0, &cur_pcid) != 0) {
388 /* read failure: report as not valid */
389 return 0;
390 }
391 if (s->parent_cid != cur_pcid) {
392 /* CID not valid */
393 return 0;
394 }
395 }
396 s->cid_checked = true;
397 /* CID valid */
398 return 1;
399 }
400
401 /* We have nothing to do for VMDK reopen, stubs just return success */
402 static int vmdk_reopen_prepare(BDRVReopenState *state,
403 BlockReopenQueue *queue, Error **errp)
404 {
405 assert(state != NULL);
406 assert(state->bs != NULL);
407 return 0;
408 }
409
410 static int vmdk_parent_open(BlockDriverState *bs)
411 {
412 char *p_name;
413 char *desc;
414 BDRVVmdkState *s = bs->opaque;
415 int ret;
416
417 desc = g_malloc0(DESC_SIZE + 1);
418 ret = bdrv_pread(bs->file, s->desc_offset, desc, DESC_SIZE);
419 if (ret < 0) {
420 goto out;
421 }
422 ret = 0;
423
424 p_name = strstr(desc, "parentFileNameHint");
425 if (p_name != NULL) {
426 char *end_name;
427
428 p_name += sizeof("parentFileNameHint") + 1;
429 end_name = strchr(p_name, '\"');
430 if (end_name == NULL) {
431 ret = -EINVAL;
432 goto out;
433 }
434 if ((end_name - p_name) > sizeof(bs->auto_backing_file) - 1) {
435 ret = -EINVAL;
436 goto out;
437 }
438
439 pstrcpy(bs->auto_backing_file, end_name - p_name + 1, p_name);
440 pstrcpy(bs->backing_file, sizeof(bs->backing_file),
441 bs->auto_backing_file);
442 pstrcpy(bs->backing_format, sizeof(bs->backing_format),
443 "vmdk");
444 }
445
446 out:
447 g_free(desc);
448 return ret;
449 }
450
451 /* Create and append extent to the extent array. Return the added VmdkExtent
452 * address. return NULL if allocation failed. */
453 static int vmdk_add_extent(BlockDriverState *bs,
454 BdrvChild *file, bool flat, int64_t sectors,
455 int64_t l1_offset, int64_t l1_backup_offset,
456 uint32_t l1_size,
457 int l2_size, uint64_t cluster_sectors,
458 VmdkExtent **new_extent,
459 Error **errp)
460 {
461 VmdkExtent *extent;
462 BDRVVmdkState *s = bs->opaque;
463 int64_t nb_sectors;
464
465 if (cluster_sectors > 0x200000) {
466 /* 0x200000 * 512Bytes = 1GB for one cluster is unrealistic */
467 error_setg(errp, "Invalid granularity, image may be corrupt");
468 return -EFBIG;
469 }
470 if (l1_size > 32 * 1024 * 1024) {
471 /*
472 * Although with big capacity and small l1_entry_sectors, we can get a
473 * big l1_size, we don't want unbounded value to allocate the table.
474 * Limit it to 32M, which is enough to store:
475 * 8TB - for both VMDK3 & VMDK4 with
476 * minimal cluster size: 512B
477 * minimal L2 table size: 512 entries
478 * 8 TB is still more than the maximal value supported for
479 * VMDK3 & VMDK4 which is 2TB.
480 * 64TB - for "ESXi seSparse Extent"
481 * minimal cluster size: 512B (default is 4KB)
482 * L2 table size: 4096 entries (const).
483 * 64TB is more than the maximal value supported for
484 * seSparse VMDKs (which is slightly less than 64TB)
485 */
486 error_setg(errp, "L1 size too big");
487 return -EFBIG;
488 }
489
490 nb_sectors = bdrv_nb_sectors(file->bs);
491 if (nb_sectors < 0) {
492 return nb_sectors;
493 }
494
495 s->extents = g_renew(VmdkExtent, s->extents, s->num_extents + 1);
496 extent = &s->extents[s->num_extents];
497 s->num_extents++;
498
499 memset(extent, 0, sizeof(VmdkExtent));
500 extent->file = file;
501 extent->flat = flat;
502 extent->sectors = sectors;
503 extent->l1_table_offset = l1_offset;
504 extent->l1_backup_table_offset = l1_backup_offset;
505 extent->l1_size = l1_size;
506 extent->l1_entry_sectors = l2_size * cluster_sectors;
507 extent->l2_size = l2_size;
508 extent->cluster_sectors = flat ? sectors : cluster_sectors;
509 extent->next_cluster_sector = ROUND_UP(nb_sectors, cluster_sectors);
510 extent->entry_size = sizeof(uint32_t);
511
512 if (s->num_extents > 1) {
513 extent->end_sector = (*(extent - 1)).end_sector + extent->sectors;
514 } else {
515 extent->end_sector = extent->sectors;
516 }
517 bs->total_sectors = extent->end_sector;
518 if (new_extent) {
519 *new_extent = extent;
520 }
521 return 0;
522 }
523
524 static int vmdk_init_tables(BlockDriverState *bs, VmdkExtent *extent,
525 Error **errp)
526 {
527 int ret;
528 size_t l1_size;
529 int i;
530
531 /* read the L1 table */
532 l1_size = extent->l1_size * extent->entry_size;
533 extent->l1_table = g_try_malloc(l1_size);
534 if (l1_size && extent->l1_table == NULL) {
535 return -ENOMEM;
536 }
537
538 ret = bdrv_pread(extent->file,
539 extent->l1_table_offset,
540 extent->l1_table,
541 l1_size);
542 if (ret < 0) {
543 bdrv_refresh_filename(extent->file->bs);
544 error_setg_errno(errp, -ret,
545 "Could not read l1 table from extent '%s'",
546 extent->file->bs->filename);
547 goto fail_l1;
548 }
549 for (i = 0; i < extent->l1_size; i++) {
550 if (extent->entry_size == sizeof(uint64_t)) {
551 le64_to_cpus((uint64_t *)extent->l1_table + i);
552 } else {
553 assert(extent->entry_size == sizeof(uint32_t));
554 le32_to_cpus((uint32_t *)extent->l1_table + i);
555 }
556 }
557
558 if (extent->l1_backup_table_offset) {
559 assert(!extent->sesparse);
560 extent->l1_backup_table = g_try_malloc(l1_size);
561 if (l1_size && extent->l1_backup_table == NULL) {
562 ret = -ENOMEM;
563 goto fail_l1;
564 }
565 ret = bdrv_pread(extent->file,
566 extent->l1_backup_table_offset,
567 extent->l1_backup_table,
568 l1_size);
569 if (ret < 0) {
570 bdrv_refresh_filename(extent->file->bs);
571 error_setg_errno(errp, -ret,
572 "Could not read l1 backup table from extent '%s'",
573 extent->file->bs->filename);
574 goto fail_l1b;
575 }
576 for (i = 0; i < extent->l1_size; i++) {
577 le32_to_cpus(&extent->l1_backup_table[i]);
578 }
579 }
580
581 extent->l2_cache =
582 g_malloc(extent->entry_size * extent->l2_size * L2_CACHE_SIZE);
583 return 0;
584 fail_l1b:
585 g_free(extent->l1_backup_table);
586 fail_l1:
587 g_free(extent->l1_table);
588 return ret;
589 }
590
591 static int vmdk_open_vmfs_sparse(BlockDriverState *bs,
592 BdrvChild *file,
593 int flags, Error **errp)
594 {
595 int ret;
596 uint32_t magic;
597 VMDK3Header header;
598 VmdkExtent *extent;
599
600 ret = bdrv_pread(file, sizeof(magic), &header, sizeof(header));
601 if (ret < 0) {
602 bdrv_refresh_filename(file->bs);
603 error_setg_errno(errp, -ret,
604 "Could not read header from file '%s'",
605 file->bs->filename);
606 return ret;
607 }
608 ret = vmdk_add_extent(bs, file, false,
609 le32_to_cpu(header.disk_sectors),
610 (int64_t)le32_to_cpu(header.l1dir_offset) << 9,
611 0,
612 le32_to_cpu(header.l1dir_size),
613 4096,
614 le32_to_cpu(header.granularity),
615 &extent,
616 errp);
617 if (ret < 0) {
618 return ret;
619 }
620 ret = vmdk_init_tables(bs, extent, errp);
621 if (ret) {
622 /* free extent allocated by vmdk_add_extent */
623 vmdk_free_last_extent(bs);
624 }
625 return ret;
626 }
627
628 #define SESPARSE_CONST_HEADER_MAGIC UINT64_C(0x00000000cafebabe)
629 #define SESPARSE_VOLATILE_HEADER_MAGIC UINT64_C(0x00000000cafecafe)
630
631 /* Strict checks - format not officially documented */
632 static int check_se_sparse_const_header(VMDKSESparseConstHeader *header,
633 Error **errp)
634 {
635 header->magic = le64_to_cpu(header->magic);
636 header->version = le64_to_cpu(header->version);
637 header->grain_size = le64_to_cpu(header->grain_size);
638 header->grain_table_size = le64_to_cpu(header->grain_table_size);
639 header->flags = le64_to_cpu(header->flags);
640 header->reserved1 = le64_to_cpu(header->reserved1);
641 header->reserved2 = le64_to_cpu(header->reserved2);
642 header->reserved3 = le64_to_cpu(header->reserved3);
643 header->reserved4 = le64_to_cpu(header->reserved4);
644
645 header->volatile_header_offset =
646 le64_to_cpu(header->volatile_header_offset);
647 header->volatile_header_size = le64_to_cpu(header->volatile_header_size);
648
649 header->journal_header_offset = le64_to_cpu(header->journal_header_offset);
650 header->journal_header_size = le64_to_cpu(header->journal_header_size);
651
652 header->journal_offset = le64_to_cpu(header->journal_offset);
653 header->journal_size = le64_to_cpu(header->journal_size);
654
655 header->grain_dir_offset = le64_to_cpu(header->grain_dir_offset);
656 header->grain_dir_size = le64_to_cpu(header->grain_dir_size);
657
658 header->grain_tables_offset = le64_to_cpu(header->grain_tables_offset);
659 header->grain_tables_size = le64_to_cpu(header->grain_tables_size);
660
661 header->free_bitmap_offset = le64_to_cpu(header->free_bitmap_offset);
662 header->free_bitmap_size = le64_to_cpu(header->free_bitmap_size);
663
664 header->backmap_offset = le64_to_cpu(header->backmap_offset);
665 header->backmap_size = le64_to_cpu(header->backmap_size);
666
667 header->grains_offset = le64_to_cpu(header->grains_offset);
668 header->grains_size = le64_to_cpu(header->grains_size);
669
670 if (header->magic != SESPARSE_CONST_HEADER_MAGIC) {
671 error_setg(errp, "Bad const header magic: 0x%016" PRIx64,
672 header->magic);
673 return -EINVAL;
674 }
675
676 if (header->version != 0x0000000200000001) {
677 error_setg(errp, "Unsupported version: 0x%016" PRIx64,
678 header->version);
679 return -ENOTSUP;
680 }
681
682 if (header->grain_size != 8) {
683 error_setg(errp, "Unsupported grain size: %" PRIu64,
684 header->grain_size);
685 return -ENOTSUP;
686 }
687
688 if (header->grain_table_size != 64) {
689 error_setg(errp, "Unsupported grain table size: %" PRIu64,
690 header->grain_table_size);
691 return -ENOTSUP;
692 }
693
694 if (header->flags != 0) {
695 error_setg(errp, "Unsupported flags: 0x%016" PRIx64,
696 header->flags);
697 return -ENOTSUP;
698 }
699
700 if (header->reserved1 != 0 || header->reserved2 != 0 ||
701 header->reserved3 != 0 || header->reserved4 != 0) {
702 error_setg(errp, "Unsupported reserved bits:"
703 " 0x%016" PRIx64 " 0x%016" PRIx64
704 " 0x%016" PRIx64 " 0x%016" PRIx64,
705 header->reserved1, header->reserved2,
706 header->reserved3, header->reserved4);
707 return -ENOTSUP;
708 }
709
710 /* check that padding is 0 */
711 if (!buffer_is_zero(header->pad, sizeof(header->pad))) {
712 error_setg(errp, "Unsupported non-zero const header padding");
713 return -ENOTSUP;
714 }
715
716 return 0;
717 }
718
719 static int check_se_sparse_volatile_header(VMDKSESparseVolatileHeader *header,
720 Error **errp)
721 {
722 header->magic = le64_to_cpu(header->magic);
723 header->free_gt_number = le64_to_cpu(header->free_gt_number);
724 header->next_txn_seq_number = le64_to_cpu(header->next_txn_seq_number);
725 header->replay_journal = le64_to_cpu(header->replay_journal);
726
727 if (header->magic != SESPARSE_VOLATILE_HEADER_MAGIC) {
728 error_setg(errp, "Bad volatile header magic: 0x%016" PRIx64,
729 header->magic);
730 return -EINVAL;
731 }
732
733 if (header->replay_journal) {
734 error_setg(errp, "Image is dirty, Replaying journal not supported");
735 return -ENOTSUP;
736 }
737
738 /* check that padding is 0 */
739 if (!buffer_is_zero(header->pad, sizeof(header->pad))) {
740 error_setg(errp, "Unsupported non-zero volatile header padding");
741 return -ENOTSUP;
742 }
743
744 return 0;
745 }
746
747 static int vmdk_open_se_sparse(BlockDriverState *bs,
748 BdrvChild *file,
749 int flags, Error **errp)
750 {
751 int ret;
752 VMDKSESparseConstHeader const_header;
753 VMDKSESparseVolatileHeader volatile_header;
754 VmdkExtent *extent;
755
756 ret = bdrv_apply_auto_read_only(bs,
757 "No write support for seSparse images available", errp);
758 if (ret < 0) {
759 return ret;
760 }
761
762 assert(sizeof(const_header) == SECTOR_SIZE);
763
764 ret = bdrv_pread(file, 0, &const_header, sizeof(const_header));
765 if (ret < 0) {
766 bdrv_refresh_filename(file->bs);
767 error_setg_errno(errp, -ret,
768 "Could not read const header from file '%s'",
769 file->bs->filename);
770 return ret;
771 }
772
773 /* check const header */
774 ret = check_se_sparse_const_header(&const_header, errp);
775 if (ret < 0) {
776 return ret;
777 }
778
779 assert(sizeof(volatile_header) == SECTOR_SIZE);
780
781 ret = bdrv_pread(file,
782 const_header.volatile_header_offset * SECTOR_SIZE,
783 &volatile_header, sizeof(volatile_header));
784 if (ret < 0) {
785 bdrv_refresh_filename(file->bs);
786 error_setg_errno(errp, -ret,
787 "Could not read volatile header from file '%s'",
788 file->bs->filename);
789 return ret;
790 }
791
792 /* check volatile header */
793 ret = check_se_sparse_volatile_header(&volatile_header, errp);
794 if (ret < 0) {
795 return ret;
796 }
797
798 ret = vmdk_add_extent(bs, file, false,
799 const_header.capacity,
800 const_header.grain_dir_offset * SECTOR_SIZE,
801 0,
802 const_header.grain_dir_size *
803 SECTOR_SIZE / sizeof(uint64_t),
804 const_header.grain_table_size *
805 SECTOR_SIZE / sizeof(uint64_t),
806 const_header.grain_size,
807 &extent,
808 errp);
809 if (ret < 0) {
810 return ret;
811 }
812
813 extent->sesparse = true;
814 extent->sesparse_l2_tables_offset = const_header.grain_tables_offset;
815 extent->sesparse_clusters_offset = const_header.grains_offset;
816 extent->entry_size = sizeof(uint64_t);
817
818 ret = vmdk_init_tables(bs, extent, errp);
819 if (ret) {
820 /* free extent allocated by vmdk_add_extent */
821 vmdk_free_last_extent(bs);
822 }
823
824 return ret;
825 }
826
827 static int vmdk_open_desc_file(BlockDriverState *bs, int flags, char *buf,
828 QDict *options, Error **errp);
829
830 static char *vmdk_read_desc(BdrvChild *file, uint64_t desc_offset, Error **errp)
831 {
832 int64_t size;
833 char *buf;
834 int ret;
835
836 size = bdrv_getlength(file->bs);
837 if (size < 0) {
838 error_setg_errno(errp, -size, "Could not access file");
839 return NULL;
840 }
841
842 if (size < 4) {
843 /* Both descriptor file and sparse image must be much larger than 4
844 * bytes, also callers of vmdk_read_desc want to compare the first 4
845 * bytes with VMDK4_MAGIC, let's error out if less is read. */
846 error_setg(errp, "File is too small, not a valid image");
847 return NULL;
848 }
849
850 size = MIN(size, (1 << 20) - 1); /* avoid unbounded allocation */
851 buf = g_malloc(size + 1);
852
853 ret = bdrv_pread(file, desc_offset, buf, size);
854 if (ret < 0) {
855 error_setg_errno(errp, -ret, "Could not read from file");
856 g_free(buf);
857 return NULL;
858 }
859 buf[ret] = 0;
860
861 return buf;
862 }
863
864 static int vmdk_open_vmdk4(BlockDriverState *bs,
865 BdrvChild *file,
866 int flags, QDict *options, Error **errp)
867 {
868 int ret;
869 uint32_t magic;
870 uint32_t l1_size, l1_entry_sectors;
871 VMDK4Header header;
872 VmdkExtent *extent;
873 BDRVVmdkState *s = bs->opaque;
874 int64_t l1_backup_offset = 0;
875 bool compressed;
876
877 ret = bdrv_pread(file, sizeof(magic), &header, sizeof(header));
878 if (ret < 0) {
879 bdrv_refresh_filename(file->bs);
880 error_setg_errno(errp, -ret,
881 "Could not read header from file '%s'",
882 file->bs->filename);
883 return -EINVAL;
884 }
885 if (header.capacity == 0) {
886 uint64_t desc_offset = le64_to_cpu(header.desc_offset);
887 if (desc_offset) {
888 char *buf = vmdk_read_desc(file, desc_offset << 9, errp);
889 if (!buf) {
890 return -EINVAL;
891 }
892 ret = vmdk_open_desc_file(bs, flags, buf, options, errp);
893 g_free(buf);
894 return ret;
895 }
896 }
897
898 if (!s->create_type) {
899 s->create_type = g_strdup("monolithicSparse");
900 }
901
902 if (le64_to_cpu(header.gd_offset) == VMDK4_GD_AT_END) {
903 /*
904 * The footer takes precedence over the header, so read it in. The
905 * footer starts at offset -1024 from the end: One sector for the
906 * footer, and another one for the end-of-stream marker.
907 */
908 struct {
909 struct {
910 uint64_t val;
911 uint32_t size;
912 uint32_t type;
913 uint8_t pad[512 - 16];
914 } QEMU_PACKED footer_marker;
915
916 uint32_t magic;
917 VMDK4Header header;
918 uint8_t pad[512 - 4 - sizeof(VMDK4Header)];
919
920 struct {
921 uint64_t val;
922 uint32_t size;
923 uint32_t type;
924 uint8_t pad[512 - 16];
925 } QEMU_PACKED eos_marker;
926 } QEMU_PACKED footer;
927
928 ret = bdrv_pread(file,
929 bs->file->bs->total_sectors * 512 - 1536,
930 &footer, sizeof(footer));
931 if (ret < 0) {
932 error_setg_errno(errp, -ret, "Failed to read footer");
933 return ret;
934 }
935
936 /* Some sanity checks for the footer */
937 if (be32_to_cpu(footer.magic) != VMDK4_MAGIC ||
938 le32_to_cpu(footer.footer_marker.size) != 0 ||
939 le32_to_cpu(footer.footer_marker.type) != MARKER_FOOTER ||
940 le64_to_cpu(footer.eos_marker.val) != 0 ||
941 le32_to_cpu(footer.eos_marker.size) != 0 ||
942 le32_to_cpu(footer.eos_marker.type) != MARKER_END_OF_STREAM)
943 {
944 error_setg(errp, "Invalid footer");
945 return -EINVAL;
946 }
947
948 header = footer.header;
949 }
950
951 compressed =
952 le16_to_cpu(header.compressAlgorithm) == VMDK4_COMPRESSION_DEFLATE;
953 if (le32_to_cpu(header.version) > 3) {
954 error_setg(errp, "Unsupported VMDK version %" PRIu32,
955 le32_to_cpu(header.version));
956 return -ENOTSUP;
957 } else if (le32_to_cpu(header.version) == 3 && (flags & BDRV_O_RDWR) &&
958 !compressed) {
959 /* VMware KB 2064959 explains that version 3 added support for
960 * persistent changed block tracking (CBT), and backup software can
961 * read it as version=1 if it doesn't care about the changed area
962 * information. So we are safe to enable read only. */
963 error_setg(errp, "VMDK version 3 must be read only");
964 return -EINVAL;
965 }
966
967 if (le32_to_cpu(header.num_gtes_per_gt) > 512) {
968 error_setg(errp, "L2 table size too big");
969 return -EINVAL;
970 }
971
972 l1_entry_sectors = le32_to_cpu(header.num_gtes_per_gt)
973 * le64_to_cpu(header.granularity);
974 if (l1_entry_sectors == 0) {
975 error_setg(errp, "L1 entry size is invalid");
976 return -EINVAL;
977 }
978 l1_size = (le64_to_cpu(header.capacity) + l1_entry_sectors - 1)
979 / l1_entry_sectors;
980 if (le32_to_cpu(header.flags) & VMDK4_FLAG_RGD) {
981 l1_backup_offset = le64_to_cpu(header.rgd_offset) << 9;
982 }
983 if (bdrv_nb_sectors(file->bs) < le64_to_cpu(header.grain_offset)) {
984 error_setg(errp, "File truncated, expecting at least %" PRId64 " bytes",
985 (int64_t)(le64_to_cpu(header.grain_offset)
986 * BDRV_SECTOR_SIZE));
987 return -EINVAL;
988 }
989
990 ret = vmdk_add_extent(bs, file, false,
991 le64_to_cpu(header.capacity),
992 le64_to_cpu(header.gd_offset) << 9,
993 l1_backup_offset,
994 l1_size,
995 le32_to_cpu(header.num_gtes_per_gt),
996 le64_to_cpu(header.granularity),
997 &extent,
998 errp);
999 if (ret < 0) {
1000 return ret;
1001 }
1002 extent->compressed =
1003 le16_to_cpu(header.compressAlgorithm) == VMDK4_COMPRESSION_DEFLATE;
1004 if (extent->compressed) {
1005 g_free(s->create_type);
1006 s->create_type = g_strdup("streamOptimized");
1007 }
1008 extent->has_marker = le32_to_cpu(header.flags) & VMDK4_FLAG_MARKER;
1009 extent->version = le32_to_cpu(header.version);
1010 extent->has_zero_grain = le32_to_cpu(header.flags) & VMDK4_FLAG_ZERO_GRAIN;
1011 ret = vmdk_init_tables(bs, extent, errp);
1012 if (ret) {
1013 /* free extent allocated by vmdk_add_extent */
1014 vmdk_free_last_extent(bs);
1015 }
1016 return ret;
1017 }
1018
1019 /* find an option value out of descriptor file */
1020 static int vmdk_parse_description(const char *desc, const char *opt_name,
1021 char *buf, int buf_size)
1022 {
1023 char *opt_pos, *opt_end;
1024 const char *end = desc + strlen(desc);
1025
1026 opt_pos = strstr(desc, opt_name);
1027 if (!opt_pos) {
1028 return VMDK_ERROR;
1029 }
1030 /* Skip "=\"" following opt_name */
1031 opt_pos += strlen(opt_name) + 2;
1032 if (opt_pos >= end) {
1033 return VMDK_ERROR;
1034 }
1035 opt_end = opt_pos;
1036 while (opt_end < end && *opt_end != '"') {
1037 opt_end++;
1038 }
1039 if (opt_end == end || buf_size < opt_end - opt_pos + 1) {
1040 return VMDK_ERROR;
1041 }
1042 pstrcpy(buf, opt_end - opt_pos + 1, opt_pos);
1043 return VMDK_OK;
1044 }
1045
1046 /* Open an extent file and append to bs array */
1047 static int vmdk_open_sparse(BlockDriverState *bs, BdrvChild *file, int flags,
1048 char *buf, QDict *options, Error **errp)
1049 {
1050 uint32_t magic;
1051
1052 magic = ldl_be_p(buf);
1053 switch (magic) {
1054 case VMDK3_MAGIC:
1055 return vmdk_open_vmfs_sparse(bs, file, flags, errp);
1056 break;
1057 case VMDK4_MAGIC:
1058 return vmdk_open_vmdk4(bs, file, flags, options, errp);
1059 break;
1060 default:
1061 error_setg(errp, "Image not in VMDK format");
1062 return -EINVAL;
1063 break;
1064 }
1065 }
1066
1067 static const char *next_line(const char *s)
1068 {
1069 while (*s) {
1070 if (*s == '\n') {
1071 return s + 1;
1072 }
1073 s++;
1074 }
1075 return s;
1076 }
1077
1078 static int vmdk_parse_extents(const char *desc, BlockDriverState *bs,
1079 QDict *options, Error **errp)
1080 {
1081 int ret;
1082 int matches;
1083 char access[11];
1084 char type[11];
1085 char fname[512];
1086 const char *p, *np;
1087 int64_t sectors = 0;
1088 int64_t flat_offset;
1089 char *desc_file_dir = NULL;
1090 char *extent_path;
1091 BdrvChild *extent_file;
1092 BDRVVmdkState *s = bs->opaque;
1093 VmdkExtent *extent;
1094 char extent_opt_prefix[32];
1095 Error *local_err = NULL;
1096
1097 for (p = desc; *p; p = next_line(p)) {
1098 /* parse extent line in one of below formats:
1099 *
1100 * RW [size in sectors] FLAT "file-name.vmdk" OFFSET
1101 * RW [size in sectors] SPARSE "file-name.vmdk"
1102 * RW [size in sectors] VMFS "file-name.vmdk"
1103 * RW [size in sectors] VMFSSPARSE "file-name.vmdk"
1104 * RW [size in sectors] SESPARSE "file-name.vmdk"
1105 */
1106 flat_offset = -1;
1107 matches = sscanf(p, "%10s %" SCNd64 " %10s \"%511[^\n\r\"]\" %" SCNd64,
1108 access, &sectors, type, fname, &flat_offset);
1109 if (matches < 4 || strcmp(access, "RW")) {
1110 continue;
1111 } else if (!strcmp(type, "FLAT")) {
1112 if (matches != 5 || flat_offset < 0) {
1113 goto invalid;
1114 }
1115 } else if (!strcmp(type, "VMFS")) {
1116 if (matches == 4) {
1117 flat_offset = 0;
1118 } else {
1119 goto invalid;
1120 }
1121 } else if (matches != 4) {
1122 goto invalid;
1123 }
1124
1125 if (sectors <= 0 ||
1126 (strcmp(type, "FLAT") && strcmp(type, "SPARSE") &&
1127 strcmp(type, "VMFS") && strcmp(type, "VMFSSPARSE") &&
1128 strcmp(type, "SESPARSE")) ||
1129 (strcmp(access, "RW"))) {
1130 continue;
1131 }
1132
1133 if (path_is_absolute(fname)) {
1134 extent_path = g_strdup(fname);
1135 } else {
1136 if (!desc_file_dir) {
1137 desc_file_dir = bdrv_dirname(bs->file->bs, errp);
1138 if (!desc_file_dir) {
1139 bdrv_refresh_filename(bs->file->bs);
1140 error_prepend(errp, "Cannot use relative paths with VMDK "
1141 "descriptor file '%s': ",
1142 bs->file->bs->filename);
1143 ret = -EINVAL;
1144 goto out;
1145 }
1146 }
1147
1148 extent_path = g_strconcat(desc_file_dir, fname, NULL);
1149 }
1150
1151 ret = snprintf(extent_opt_prefix, 32, "extents.%d", s->num_extents);
1152 assert(ret < 32);
1153
1154 extent_file = bdrv_open_child(extent_path, options, extent_opt_prefix,
1155 bs, &child_file, false, &local_err);
1156 g_free(extent_path);
1157 if (local_err) {
1158 error_propagate(errp, local_err);
1159 ret = -EINVAL;
1160 goto out;
1161 }
1162
1163 /* save to extents array */
1164 if (!strcmp(type, "FLAT") || !strcmp(type, "VMFS")) {
1165 /* FLAT extent */
1166
1167 ret = vmdk_add_extent(bs, extent_file, true, sectors,
1168 0, 0, 0, 0, 0, &extent, errp);
1169 if (ret < 0) {
1170 bdrv_unref_child(bs, extent_file);
1171 goto out;
1172 }
1173 extent->flat_start_offset = flat_offset << 9;
1174 } else if (!strcmp(type, "SPARSE") || !strcmp(type, "VMFSSPARSE")) {
1175 /* SPARSE extent and VMFSSPARSE extent are both "COWD" sparse file*/
1176 char *buf = vmdk_read_desc(extent_file, 0, errp);
1177 if (!buf) {
1178 ret = -EINVAL;
1179 } else {
1180 ret = vmdk_open_sparse(bs, extent_file, bs->open_flags, buf,
1181 options, errp);
1182 }
1183 g_free(buf);
1184 if (ret) {
1185 bdrv_unref_child(bs, extent_file);
1186 goto out;
1187 }
1188 extent = &s->extents[s->num_extents - 1];
1189 } else if (!strcmp(type, "SESPARSE")) {
1190 ret = vmdk_open_se_sparse(bs, extent_file, bs->open_flags, errp);
1191 if (ret) {
1192 bdrv_unref_child(bs, extent_file);
1193 goto out;
1194 }
1195 extent = &s->extents[s->num_extents - 1];
1196 } else {
1197 error_setg(errp, "Unsupported extent type '%s'", type);
1198 bdrv_unref_child(bs, extent_file);
1199 ret = -ENOTSUP;
1200 goto out;
1201 }
1202 extent->type = g_strdup(type);
1203 }
1204
1205 ret = 0;
1206 goto out;
1207
1208 invalid:
1209 np = next_line(p);
1210 assert(np != p);
1211 if (np[-1] == '\n') {
1212 np--;
1213 }
1214 error_setg(errp, "Invalid extent line: %.*s", (int)(np - p), p);
1215 ret = -EINVAL;
1216
1217 out:
1218 g_free(desc_file_dir);
1219 return ret;
1220 }
1221
1222 static int vmdk_open_desc_file(BlockDriverState *bs, int flags, char *buf,
1223 QDict *options, Error **errp)
1224 {
1225 int ret;
1226 char ct[128];
1227 BDRVVmdkState *s = bs->opaque;
1228
1229 if (vmdk_parse_description(buf, "createType", ct, sizeof(ct))) {
1230 error_setg(errp, "invalid VMDK image descriptor");
1231 ret = -EINVAL;
1232 goto exit;
1233 }
1234 if (strcmp(ct, "monolithicFlat") &&
1235 strcmp(ct, "vmfs") &&
1236 strcmp(ct, "vmfsSparse") &&
1237 strcmp(ct, "seSparse") &&
1238 strcmp(ct, "twoGbMaxExtentSparse") &&
1239 strcmp(ct, "twoGbMaxExtentFlat")) {
1240 error_setg(errp, "Unsupported image type '%s'", ct);
1241 ret = -ENOTSUP;
1242 goto exit;
1243 }
1244 s->create_type = g_strdup(ct);
1245 s->desc_offset = 0;
1246 ret = vmdk_parse_extents(buf, bs, options, errp);
1247 exit:
1248 return ret;
1249 }
1250
1251 static int vmdk_open(BlockDriverState *bs, QDict *options, int flags,
1252 Error **errp)
1253 {
1254 char *buf;
1255 int ret;
1256 BDRVVmdkState *s = bs->opaque;
1257 uint32_t magic;
1258 Error *local_err = NULL;
1259
1260 bs->file = bdrv_open_child(NULL, options, "file", bs, &child_file,
1261 false, errp);
1262 if (!bs->file) {
1263 return -EINVAL;
1264 }
1265
1266 buf = vmdk_read_desc(bs->file, 0, errp);
1267 if (!buf) {
1268 return -EINVAL;
1269 }
1270
1271 magic = ldl_be_p(buf);
1272 switch (magic) {
1273 case VMDK3_MAGIC:
1274 case VMDK4_MAGIC:
1275 ret = vmdk_open_sparse(bs, bs->file, flags, buf, options,
1276 errp);
1277 s->desc_offset = 0x200;
1278 break;
1279 default:
1280 ret = vmdk_open_desc_file(bs, flags, buf, options, errp);
1281 break;
1282 }
1283 if (ret) {
1284 goto fail;
1285 }
1286
1287 /* try to open parent images, if exist */
1288 ret = vmdk_parent_open(bs);
1289 if (ret) {
1290 goto fail;
1291 }
1292 ret = vmdk_read_cid(bs, 0, &s->cid);
1293 if (ret) {
1294 goto fail;
1295 }
1296 ret = vmdk_read_cid(bs, 1, &s->parent_cid);
1297 if (ret) {
1298 goto fail;
1299 }
1300 qemu_co_mutex_init(&s->lock);
1301
1302 /* Disable migration when VMDK images are used */
1303 error_setg(&s->migration_blocker, "The vmdk format used by node '%s' "
1304 "does not support live migration",
1305 bdrv_get_device_or_node_name(bs));
1306 ret = migrate_add_blocker(s->migration_blocker, &local_err);
1307 if (local_err) {
1308 error_propagate(errp, local_err);
1309 error_free(s->migration_blocker);
1310 goto fail;
1311 }
1312
1313 g_free(buf);
1314 return 0;
1315
1316 fail:
1317 g_free(buf);
1318 g_free(s->create_type);
1319 s->create_type = NULL;
1320 vmdk_free_extents(bs);
1321 return ret;
1322 }
1323
1324
1325 static void vmdk_refresh_limits(BlockDriverState *bs, Error **errp)
1326 {
1327 BDRVVmdkState *s = bs->opaque;
1328 int i;
1329
1330 for (i = 0; i < s->num_extents; i++) {
1331 if (!s->extents[i].flat) {
1332 bs->bl.pwrite_zeroes_alignment =
1333 MAX(bs->bl.pwrite_zeroes_alignment,
1334 s->extents[i].cluster_sectors << BDRV_SECTOR_BITS);
1335 }
1336 }
1337 }
1338
1339 /**
1340 * get_whole_cluster
1341 *
1342 * Copy backing file's cluster that covers @sector_num, otherwise write zero,
1343 * to the cluster at @cluster_sector_num.
1344 *
1345 * If @skip_start_sector < @skip_end_sector, the relative range
1346 * [@skip_start_sector, @skip_end_sector) is not copied or written, and leave
1347 * it for call to write user data in the request.
1348 */
1349 static int get_whole_cluster(BlockDriverState *bs,
1350 VmdkExtent *extent,
1351 uint64_t cluster_offset,
1352 uint64_t offset,
1353 uint64_t skip_start_bytes,
1354 uint64_t skip_end_bytes)
1355 {
1356 int ret = VMDK_OK;
1357 int64_t cluster_bytes;
1358 uint8_t *whole_grain;
1359
1360 /* For COW, align request sector_num to cluster start */
1361 cluster_bytes = extent->cluster_sectors << BDRV_SECTOR_BITS;
1362 offset = QEMU_ALIGN_DOWN(offset, cluster_bytes);
1363 whole_grain = qemu_blockalign(bs, cluster_bytes);
1364
1365 if (!bs->backing) {
1366 memset(whole_grain, 0, skip_start_bytes);
1367 memset(whole_grain + skip_end_bytes, 0, cluster_bytes - skip_end_bytes);
1368 }
1369
1370 assert(skip_end_bytes <= cluster_bytes);
1371 /* we will be here if it's first write on non-exist grain(cluster).
1372 * try to read from parent image, if exist */
1373 if (bs->backing && !vmdk_is_cid_valid(bs)) {
1374 ret = VMDK_ERROR;
1375 goto exit;
1376 }
1377
1378 /* Read backing data before skip range */
1379 if (skip_start_bytes > 0) {
1380 if (bs->backing) {
1381 /* qcow2 emits this on bs->file instead of bs->backing */
1382 BLKDBG_EVENT(extent->file, BLKDBG_COW_READ);
1383 ret = bdrv_pread(bs->backing, offset, whole_grain,
1384 skip_start_bytes);
1385 if (ret < 0) {
1386 ret = VMDK_ERROR;
1387 goto exit;
1388 }
1389 }
1390 BLKDBG_EVENT(extent->file, BLKDBG_COW_WRITE);
1391 ret = bdrv_pwrite(extent->file, cluster_offset, whole_grain,
1392 skip_start_bytes);
1393 if (ret < 0) {
1394 ret = VMDK_ERROR;
1395 goto exit;
1396 }
1397 }
1398 /* Read backing data after skip range */
1399 if (skip_end_bytes < cluster_bytes) {
1400 if (bs->backing) {
1401 /* qcow2 emits this on bs->file instead of bs->backing */
1402 BLKDBG_EVENT(extent->file, BLKDBG_COW_READ);
1403 ret = bdrv_pread(bs->backing, offset + skip_end_bytes,
1404 whole_grain + skip_end_bytes,
1405 cluster_bytes - skip_end_bytes);
1406 if (ret < 0) {
1407 ret = VMDK_ERROR;
1408 goto exit;
1409 }
1410 }
1411 BLKDBG_EVENT(extent->file, BLKDBG_COW_WRITE);
1412 ret = bdrv_pwrite(extent->file, cluster_offset + skip_end_bytes,
1413 whole_grain + skip_end_bytes,
1414 cluster_bytes - skip_end_bytes);
1415 if (ret < 0) {
1416 ret = VMDK_ERROR;
1417 goto exit;
1418 }
1419 }
1420
1421 ret = VMDK_OK;
1422 exit:
1423 qemu_vfree(whole_grain);
1424 return ret;
1425 }
1426
1427 static int vmdk_L2update(VmdkExtent *extent, VmdkMetaData *m_data,
1428 uint32_t offset)
1429 {
1430 offset = cpu_to_le32(offset);
1431 /* update L2 table */
1432 BLKDBG_EVENT(extent->file, BLKDBG_L2_UPDATE);
1433 if (bdrv_pwrite_sync(extent->file,
1434 ((int64_t)m_data->l2_offset * 512)
1435 + (m_data->l2_index * sizeof(offset)),
1436 &offset, sizeof(offset)) < 0) {
1437 return VMDK_ERROR;
1438 }
1439 /* update backup L2 table */
1440 if (extent->l1_backup_table_offset != 0) {
1441 m_data->l2_offset = extent->l1_backup_table[m_data->l1_index];
1442 if (bdrv_pwrite_sync(extent->file,
1443 ((int64_t)m_data->l2_offset * 512)
1444 + (m_data->l2_index * sizeof(offset)),
1445 &offset, sizeof(offset)) < 0) {
1446 return VMDK_ERROR;
1447 }
1448 }
1449 if (m_data->l2_cache_entry) {
1450 *m_data->l2_cache_entry = offset;
1451 }
1452
1453 return VMDK_OK;
1454 }
1455
1456 /**
1457 * get_cluster_offset
1458 *
1459 * Look up cluster offset in extent file by sector number, and store in
1460 * @cluster_offset.
1461 *
1462 * For flat extents, the start offset as parsed from the description file is
1463 * returned.
1464 *
1465 * For sparse extents, look up in L1, L2 table. If allocate is true, return an
1466 * offset for a new cluster and update L2 cache. If there is a backing file,
1467 * COW is done before returning; otherwise, zeroes are written to the allocated
1468 * cluster. Both COW and zero writing skips the sector range
1469 * [@skip_start_sector, @skip_end_sector) passed in by caller, because caller
1470 * has new data to write there.
1471 *
1472 * Returns: VMDK_OK if cluster exists and mapped in the image.
1473 * VMDK_UNALLOC if cluster is not mapped and @allocate is false.
1474 * VMDK_ERROR if failed.
1475 */
1476 static int get_cluster_offset(BlockDriverState *bs,
1477 VmdkExtent *extent,
1478 VmdkMetaData *m_data,
1479 uint64_t offset,
1480 bool allocate,
1481 uint64_t *cluster_offset,
1482 uint64_t skip_start_bytes,
1483 uint64_t skip_end_bytes)
1484 {
1485 unsigned int l1_index, l2_offset, l2_index;
1486 int min_index, i, j;
1487 uint32_t min_count;
1488 void *l2_table;
1489 bool zeroed = false;
1490 int64_t ret;
1491 int64_t cluster_sector;
1492 unsigned int l2_size_bytes = extent->l2_size * extent->entry_size;
1493
1494 if (m_data) {
1495 m_data->valid = 0;
1496 }
1497 if (extent->flat) {
1498 *cluster_offset = extent->flat_start_offset;
1499 return VMDK_OK;
1500 }
1501
1502 offset -= (extent->end_sector - extent->sectors) * SECTOR_SIZE;
1503 l1_index = (offset >> 9) / extent->l1_entry_sectors;
1504 if (l1_index >= extent->l1_size) {
1505 return VMDK_ERROR;
1506 }
1507 if (extent->sesparse) {
1508 uint64_t l2_offset_u64;
1509
1510 assert(extent->entry_size == sizeof(uint64_t));
1511
1512 l2_offset_u64 = ((uint64_t *)extent->l1_table)[l1_index];
1513 if (l2_offset_u64 == 0) {
1514 l2_offset = 0;
1515 } else if ((l2_offset_u64 & 0xffffffff00000000) != 0x1000000000000000) {
1516 /*
1517 * Top most nibble is 0x1 if grain table is allocated.
1518 * strict check - top most 4 bytes must be 0x10000000 since max
1519 * supported size is 64TB for disk - so no more than 64TB / 16MB
1520 * grain directories which is smaller than uint32,
1521 * where 16MB is the only supported default grain table coverage.
1522 */
1523 return VMDK_ERROR;
1524 } else {
1525 l2_offset_u64 = l2_offset_u64 & 0x00000000ffffffff;
1526 l2_offset_u64 = extent->sesparse_l2_tables_offset +
1527 l2_offset_u64 * l2_size_bytes / SECTOR_SIZE;
1528 if (l2_offset_u64 > 0x00000000ffffffff) {
1529 return VMDK_ERROR;
1530 }
1531 l2_offset = (unsigned int)(l2_offset_u64);
1532 }
1533 } else {
1534 assert(extent->entry_size == sizeof(uint32_t));
1535 l2_offset = ((uint32_t *)extent->l1_table)[l1_index];
1536 }
1537 if (!l2_offset) {
1538 return VMDK_UNALLOC;
1539 }
1540 for (i = 0; i < L2_CACHE_SIZE; i++) {
1541 if (l2_offset == extent->l2_cache_offsets[i]) {
1542 /* increment the hit count */
1543 if (++extent->l2_cache_counts[i] == 0xffffffff) {
1544 for (j = 0; j < L2_CACHE_SIZE; j++) {
1545 extent->l2_cache_counts[j] >>= 1;
1546 }
1547 }
1548 l2_table = (char *)extent->l2_cache + (i * l2_size_bytes);
1549 goto found;
1550 }
1551 }
1552 /* not found: load a new entry in the least used one */
1553 min_index = 0;
1554 min_count = 0xffffffff;
1555 for (i = 0; i < L2_CACHE_SIZE; i++) {
1556 if (extent->l2_cache_counts[i] < min_count) {
1557 min_count = extent->l2_cache_counts[i];
1558 min_index = i;
1559 }
1560 }
1561 l2_table = (char *)extent->l2_cache + (min_index * l2_size_bytes);
1562 BLKDBG_EVENT(extent->file, BLKDBG_L2_LOAD);
1563 if (bdrv_pread(extent->file,
1564 (int64_t)l2_offset * 512,
1565 l2_table,
1566 l2_size_bytes
1567 ) != l2_size_bytes) {
1568 return VMDK_ERROR;
1569 }
1570
1571 extent->l2_cache_offsets[min_index] = l2_offset;
1572 extent->l2_cache_counts[min_index] = 1;
1573 found:
1574 l2_index = ((offset >> 9) / extent->cluster_sectors) % extent->l2_size;
1575
1576 if (extent->sesparse) {
1577 cluster_sector = le64_to_cpu(((uint64_t *)l2_table)[l2_index]);
1578 switch (cluster_sector & 0xf000000000000000) {
1579 case 0x0000000000000000:
1580 /* unallocated grain */
1581 if (cluster_sector != 0) {
1582 return VMDK_ERROR;
1583 }
1584 break;
1585 case 0x1000000000000000:
1586 /* scsi-unmapped grain - fallthrough */
1587 case 0x2000000000000000:
1588 /* zero grain */
1589 zeroed = true;
1590 break;
1591 case 0x3000000000000000:
1592 /* allocated grain */
1593 cluster_sector = (((cluster_sector & 0x0fff000000000000) >> 48) |
1594 ((cluster_sector & 0x0000ffffffffffff) << 12));
1595 cluster_sector = extent->sesparse_clusters_offset +
1596 cluster_sector * extent->cluster_sectors;
1597 break;
1598 default:
1599 return VMDK_ERROR;
1600 }
1601 } else {
1602 cluster_sector = le32_to_cpu(((uint32_t *)l2_table)[l2_index]);
1603
1604 if (extent->has_zero_grain && cluster_sector == VMDK_GTE_ZEROED) {
1605 zeroed = true;
1606 }
1607 }
1608
1609 if (!cluster_sector || zeroed) {
1610 if (!allocate) {
1611 return zeroed ? VMDK_ZEROED : VMDK_UNALLOC;
1612 }
1613 assert(!extent->sesparse);
1614
1615 if (extent->next_cluster_sector >= VMDK_EXTENT_MAX_SECTORS) {
1616 return VMDK_ERROR;
1617 }
1618
1619 cluster_sector = extent->next_cluster_sector;
1620 extent->next_cluster_sector += extent->cluster_sectors;
1621
1622 /* First of all we write grain itself, to avoid race condition
1623 * that may to corrupt the image.
1624 * This problem may occur because of insufficient space on host disk
1625 * or inappropriate VM shutdown.
1626 */
1627 ret = get_whole_cluster(bs, extent, cluster_sector * BDRV_SECTOR_SIZE,
1628 offset, skip_start_bytes, skip_end_bytes);
1629 if (ret) {
1630 return ret;
1631 }
1632 if (m_data) {
1633 m_data->valid = 1;
1634 m_data->l1_index = l1_index;
1635 m_data->l2_index = l2_index;
1636 m_data->l2_offset = l2_offset;
1637 m_data->l2_cache_entry = ((uint32_t *)l2_table) + l2_index;
1638 }
1639 }
1640 *cluster_offset = cluster_sector << BDRV_SECTOR_BITS;
1641 return VMDK_OK;
1642 }
1643
1644 static VmdkExtent *find_extent(BDRVVmdkState *s,
1645 int64_t sector_num, VmdkExtent *start_hint)
1646 {
1647 VmdkExtent *extent = start_hint;
1648
1649 if (!extent) {
1650 extent = &s->extents[0];
1651 }
1652 while (extent < &s->extents[s->num_extents]) {
1653 if (sector_num < extent->end_sector) {
1654 return extent;
1655 }
1656 extent++;
1657 }
1658 return NULL;
1659 }
1660
1661 static inline uint64_t vmdk_find_offset_in_cluster(VmdkExtent *extent,
1662 int64_t offset)
1663 {
1664 uint64_t extent_begin_offset, extent_relative_offset;
1665 uint64_t cluster_size = extent->cluster_sectors * BDRV_SECTOR_SIZE;
1666
1667 extent_begin_offset =
1668 (extent->end_sector - extent->sectors) * BDRV_SECTOR_SIZE;
1669 extent_relative_offset = offset - extent_begin_offset;
1670 return extent_relative_offset % cluster_size;
1671 }
1672
1673 static int coroutine_fn vmdk_co_block_status(BlockDriverState *bs,
1674 bool want_zero,
1675 int64_t offset, int64_t bytes,
1676 int64_t *pnum, int64_t *map,
1677 BlockDriverState **file)
1678 {
1679 BDRVVmdkState *s = bs->opaque;
1680 int64_t index_in_cluster, n, ret;
1681 uint64_t cluster_offset;
1682 VmdkExtent *extent;
1683
1684 extent = find_extent(s, offset >> BDRV_SECTOR_BITS, NULL);
1685 if (!extent) {
1686 return -EIO;
1687 }
1688 qemu_co_mutex_lock(&s->lock);
1689 ret = get_cluster_offset(bs, extent, NULL, offset, false, &cluster_offset,
1690 0, 0);
1691 qemu_co_mutex_unlock(&s->lock);
1692
1693 index_in_cluster = vmdk_find_offset_in_cluster(extent, offset);
1694 switch (ret) {
1695 case VMDK_ERROR:
1696 ret = -EIO;
1697 break;
1698 case VMDK_UNALLOC:
1699 ret = 0;
1700 break;
1701 case VMDK_ZEROED:
1702 ret = BDRV_BLOCK_ZERO;
1703 break;
1704 case VMDK_OK:
1705 ret = BDRV_BLOCK_DATA;
1706 if (!extent->compressed) {
1707 ret |= BDRV_BLOCK_OFFSET_VALID;
1708 *map = cluster_offset + index_in_cluster;
1709 if (extent->flat) {
1710 ret |= BDRV_BLOCK_RECURSE;
1711 }
1712 }
1713 *file = extent->file->bs;
1714 break;
1715 }
1716
1717 n = extent->cluster_sectors * BDRV_SECTOR_SIZE - index_in_cluster;
1718 *pnum = MIN(n, bytes);
1719 return ret;
1720 }
1721
1722 static int vmdk_write_extent(VmdkExtent *extent, int64_t cluster_offset,
1723 int64_t offset_in_cluster, QEMUIOVector *qiov,
1724 uint64_t qiov_offset, uint64_t n_bytes,
1725 uint64_t offset)
1726 {
1727 int ret;
1728 VmdkGrainMarker *data = NULL;
1729 uLongf buf_len;
1730 QEMUIOVector local_qiov;
1731 int64_t write_offset;
1732 int64_t write_end_sector;
1733
1734 if (extent->compressed) {
1735 void *compressed_data;
1736
1737 /* Only whole clusters */
1738 if (offset_in_cluster ||
1739 n_bytes > (extent->cluster_sectors * SECTOR_SIZE) ||
1740 (n_bytes < (extent->cluster_sectors * SECTOR_SIZE) &&
1741 offset + n_bytes != extent->end_sector * SECTOR_SIZE))
1742 {
1743 ret = -EINVAL;
1744 goto out;
1745 }
1746
1747 if (!extent->has_marker) {
1748 ret = -EINVAL;
1749 goto out;
1750 }
1751 buf_len = (extent->cluster_sectors << 9) * 2;
1752 data = g_malloc(buf_len + sizeof(VmdkGrainMarker));
1753
1754 compressed_data = g_malloc(n_bytes);
1755 qemu_iovec_to_buf(qiov, qiov_offset, compressed_data, n_bytes);
1756 ret = compress(data->data, &buf_len, compressed_data, n_bytes);
1757 g_free(compressed_data);
1758
1759 if (ret != Z_OK || buf_len == 0) {
1760 ret = -EINVAL;
1761 goto out;
1762 }
1763
1764 data->lba = cpu_to_le64(offset >> BDRV_SECTOR_BITS);
1765 data->size = cpu_to_le32(buf_len);
1766
1767 n_bytes = buf_len + sizeof(VmdkGrainMarker);
1768 qemu_iovec_init_buf(&local_qiov, data, n_bytes);
1769
1770 BLKDBG_EVENT(extent->file, BLKDBG_WRITE_COMPRESSED);
1771 } else {
1772 qemu_iovec_init(&local_qiov, qiov->niov);
1773 qemu_iovec_concat(&local_qiov, qiov, qiov_offset, n_bytes);
1774
1775 BLKDBG_EVENT(extent->file, BLKDBG_WRITE_AIO);
1776 }
1777
1778 write_offset = cluster_offset + offset_in_cluster;
1779 ret = bdrv_co_pwritev(extent->file, write_offset, n_bytes,
1780 &local_qiov, 0);
1781
1782 write_end_sector = DIV_ROUND_UP(write_offset + n_bytes, BDRV_SECTOR_SIZE);
1783
1784 if (extent->compressed) {
1785 extent->next_cluster_sector = write_end_sector;
1786 } else {
1787 extent->next_cluster_sector = MAX(extent->next_cluster_sector,
1788 write_end_sector);
1789 }
1790
1791 if (ret < 0) {
1792 goto out;
1793 }
1794 ret = 0;
1795 out:
1796 g_free(data);
1797 if (!extent->compressed) {
1798 qemu_iovec_destroy(&local_qiov);
1799 }
1800 return ret;
1801 }
1802
1803 static int vmdk_read_extent(VmdkExtent *extent, int64_t cluster_offset,
1804 int64_t offset_in_cluster, QEMUIOVector *qiov,
1805 int bytes)
1806 {
1807 int ret;
1808 int cluster_bytes, buf_bytes;
1809 uint8_t *cluster_buf, *compressed_data;
1810 uint8_t *uncomp_buf;
1811 uint32_t data_len;
1812 VmdkGrainMarker *marker;
1813 uLongf buf_len;
1814
1815
1816 if (!extent->compressed) {
1817 BLKDBG_EVENT(extent->file, BLKDBG_READ_AIO);
1818 ret = bdrv_co_preadv(extent->file,
1819 cluster_offset + offset_in_cluster, bytes,
1820 qiov, 0);
1821 if (ret < 0) {
1822 return ret;
1823 }
1824 return 0;
1825 }
1826 cluster_bytes = extent->cluster_sectors * 512;
1827 /* Read two clusters in case GrainMarker + compressed data > one cluster */
1828 buf_bytes = cluster_bytes * 2;
1829 cluster_buf = g_malloc(buf_bytes);
1830 uncomp_buf = g_malloc(cluster_bytes);
1831 BLKDBG_EVENT(extent->file, BLKDBG_READ_COMPRESSED);
1832 ret = bdrv_pread(extent->file,
1833 cluster_offset,
1834 cluster_buf, buf_bytes);
1835 if (ret < 0) {
1836 goto out;
1837 }
1838 compressed_data = cluster_buf;
1839 buf_len = cluster_bytes;
1840 data_len = cluster_bytes;
1841 if (extent->has_marker) {
1842 marker = (VmdkGrainMarker *)cluster_buf;
1843 compressed_data = marker->data;
1844 data_len = le32_to_cpu(marker->size);
1845 }
1846 if (!data_len || data_len > buf_bytes) {
1847 ret = -EINVAL;
1848 goto out;
1849 }
1850 ret = uncompress(uncomp_buf, &buf_len, compressed_data, data_len);
1851 if (ret != Z_OK) {
1852 ret = -EINVAL;
1853 goto out;
1854
1855 }
1856 if (offset_in_cluster < 0 ||
1857 offset_in_cluster + bytes > buf_len) {
1858 ret = -EINVAL;
1859 goto out;
1860 }
1861 qemu_iovec_from_buf(qiov, 0, uncomp_buf + offset_in_cluster, bytes);
1862 ret = 0;
1863
1864 out:
1865 g_free(uncomp_buf);
1866 g_free(cluster_buf);
1867 return ret;
1868 }
1869
1870 static int coroutine_fn
1871 vmdk_co_preadv(BlockDriverState *bs, uint64_t offset, uint64_t bytes,
1872 QEMUIOVector *qiov, int flags)
1873 {
1874 BDRVVmdkState *s = bs->opaque;
1875 int ret;
1876 uint64_t n_bytes, offset_in_cluster;
1877 VmdkExtent *extent = NULL;
1878 QEMUIOVector local_qiov;
1879 uint64_t cluster_offset;
1880 uint64_t bytes_done = 0;
1881
1882 qemu_iovec_init(&local_qiov, qiov->niov);
1883 qemu_co_mutex_lock(&s->lock);
1884
1885 while (bytes > 0) {
1886 extent = find_extent(s, offset >> BDRV_SECTOR_BITS, extent);
1887 if (!extent) {
1888 ret = -EIO;
1889 goto fail;
1890 }
1891 ret = get_cluster_offset(bs, extent, NULL,
1892 offset, false, &cluster_offset, 0, 0);
1893 offset_in_cluster = vmdk_find_offset_in_cluster(extent, offset);
1894
1895 n_bytes = MIN(bytes, extent->cluster_sectors * BDRV_SECTOR_SIZE
1896 - offset_in_cluster);
1897
1898 if (ret != VMDK_OK) {
1899 /* if not allocated, try to read from parent image, if exist */
1900 if (bs->backing && ret != VMDK_ZEROED) {
1901 if (!vmdk_is_cid_valid(bs)) {
1902 ret = -EINVAL;
1903 goto fail;
1904 }
1905
1906 qemu_iovec_reset(&local_qiov);
1907 qemu_iovec_concat(&local_qiov, qiov, bytes_done, n_bytes);
1908
1909 /* qcow2 emits this on bs->file instead of bs->backing */
1910 BLKDBG_EVENT(bs->file, BLKDBG_READ_BACKING_AIO);
1911 ret = bdrv_co_preadv(bs->backing, offset, n_bytes,
1912 &local_qiov, 0);
1913 if (ret < 0) {
1914 goto fail;
1915 }
1916 } else {
1917 qemu_iovec_memset(qiov, bytes_done, 0, n_bytes);
1918 }
1919 } else {
1920 qemu_iovec_reset(&local_qiov);
1921 qemu_iovec_concat(&local_qiov, qiov, bytes_done, n_bytes);
1922
1923 ret = vmdk_read_extent(extent, cluster_offset, offset_in_cluster,
1924 &local_qiov, n_bytes);
1925 if (ret) {
1926 goto fail;
1927 }
1928 }
1929 bytes -= n_bytes;
1930 offset += n_bytes;
1931 bytes_done += n_bytes;
1932 }
1933
1934 ret = 0;
1935 fail:
1936 qemu_co_mutex_unlock(&s->lock);
1937 qemu_iovec_destroy(&local_qiov);
1938
1939 return ret;
1940 }
1941
1942 /**
1943 * vmdk_write:
1944 * @zeroed: buf is ignored (data is zero), use zeroed_grain GTE feature
1945 * if possible, otherwise return -ENOTSUP.
1946 * @zero_dry_run: used for zeroed == true only, don't update L2 table, just try
1947 * with each cluster. By dry run we can find if the zero write
1948 * is possible without modifying image data.
1949 *
1950 * Returns: error code with 0 for success.
1951 */
1952 static int vmdk_pwritev(BlockDriverState *bs, uint64_t offset,
1953 uint64_t bytes, QEMUIOVector *qiov,
1954 bool zeroed, bool zero_dry_run)
1955 {
1956 BDRVVmdkState *s = bs->opaque;
1957 VmdkExtent *extent = NULL;
1958 int ret;
1959 int64_t offset_in_cluster, n_bytes;
1960 uint64_t cluster_offset;
1961 uint64_t bytes_done = 0;
1962 VmdkMetaData m_data;
1963
1964 if (DIV_ROUND_UP(offset, BDRV_SECTOR_SIZE) > bs->total_sectors) {
1965 error_report("Wrong offset: offset=0x%" PRIx64
1966 " total_sectors=0x%" PRIx64,
1967 offset, bs->total_sectors);
1968 return -EIO;
1969 }
1970
1971 while (bytes > 0) {
1972 extent = find_extent(s, offset >> BDRV_SECTOR_BITS, extent);
1973 if (!extent) {
1974 return -EIO;
1975 }
1976 if (extent->sesparse) {
1977 return -ENOTSUP;
1978 }
1979 offset_in_cluster = vmdk_find_offset_in_cluster(extent, offset);
1980 n_bytes = MIN(bytes, extent->cluster_sectors * BDRV_SECTOR_SIZE
1981 - offset_in_cluster);
1982
1983 ret = get_cluster_offset(bs, extent, &m_data, offset,
1984 !(extent->compressed || zeroed),
1985 &cluster_offset, offset_in_cluster,
1986 offset_in_cluster + n_bytes);
1987 if (extent->compressed) {
1988 if (ret == VMDK_OK) {
1989 /* Refuse write to allocated cluster for streamOptimized */
1990 error_report("Could not write to allocated cluster"
1991 " for streamOptimized");
1992 return -EIO;
1993 } else {
1994 /* allocate */
1995 ret = get_cluster_offset(bs, extent, &m_data, offset,
1996 true, &cluster_offset, 0, 0);
1997 }
1998 }
1999 if (ret == VMDK_ERROR) {
2000 return -EINVAL;
2001 }
2002 if (zeroed) {
2003 /* Do zeroed write, buf is ignored */
2004 if (extent->has_zero_grain &&
2005 offset_in_cluster == 0 &&
2006 n_bytes >= extent->cluster_sectors * BDRV_SECTOR_SIZE) {
2007 n_bytes = extent->cluster_sectors * BDRV_SECTOR_SIZE;
2008 if (!zero_dry_run) {
2009 /* update L2 tables */
2010 if (vmdk_L2update(extent, &m_data, VMDK_GTE_ZEROED)
2011 != VMDK_OK) {
2012 return -EIO;
2013 }
2014 }
2015 } else {
2016 return -ENOTSUP;
2017 }
2018 } else {
2019 ret = vmdk_write_extent(extent, cluster_offset, offset_in_cluster,
2020 qiov, bytes_done, n_bytes, offset);
2021 if (ret) {
2022 return ret;
2023 }
2024 if (m_data.valid) {
2025 /* update L2 tables */
2026 if (vmdk_L2update(extent, &m_data,
2027 cluster_offset >> BDRV_SECTOR_BITS)
2028 != VMDK_OK) {
2029 return -EIO;
2030 }
2031 }
2032 }
2033 bytes -= n_bytes;
2034 offset += n_bytes;
2035 bytes_done += n_bytes;
2036
2037 /* update CID on the first write every time the virtual disk is
2038 * opened */
2039 if (!s->cid_updated) {
2040 ret = vmdk_write_cid(bs, g_random_int());
2041 if (ret < 0) {
2042 return ret;
2043 }
2044 s->cid_updated = true;
2045 }
2046 }
2047 return 0;
2048 }
2049
2050 static int coroutine_fn
2051 vmdk_co_pwritev(BlockDriverState *bs, uint64_t offset, uint64_t bytes,
2052 QEMUIOVector *qiov, int flags)
2053 {
2054 int ret;
2055 BDRVVmdkState *s = bs->opaque;
2056 qemu_co_mutex_lock(&s->lock);
2057 ret = vmdk_pwritev(bs, offset, bytes, qiov, false, false);
2058 qemu_co_mutex_unlock(&s->lock);
2059 return ret;
2060 }
2061
2062 static int coroutine_fn
2063 vmdk_co_pwritev_compressed(BlockDriverState *bs, uint64_t offset,
2064 uint64_t bytes, QEMUIOVector *qiov)
2065 {
2066 if (bytes == 0) {
2067 /* The caller will write bytes 0 to signal EOF.
2068 * When receive it, we align EOF to a sector boundary. */
2069 BDRVVmdkState *s = bs->opaque;
2070 int i, ret;
2071 int64_t length;
2072
2073 for (i = 0; i < s->num_extents; i++) {
2074 length = bdrv_getlength(s->extents[i].file->bs);
2075 if (length < 0) {
2076 return length;
2077 }
2078 length = QEMU_ALIGN_UP(length, BDRV_SECTOR_SIZE);
2079 ret = bdrv_truncate(s->extents[i].file, length, false,
2080 PREALLOC_MODE_OFF, NULL);
2081 if (ret < 0) {
2082 return ret;
2083 }
2084 }
2085 return 0;
2086 }
2087 return vmdk_co_pwritev(bs, offset, bytes, qiov, 0);
2088 }
2089
2090 static int coroutine_fn vmdk_co_pwrite_zeroes(BlockDriverState *bs,
2091 int64_t offset,
2092 int bytes,
2093 BdrvRequestFlags flags)
2094 {
2095 int ret;
2096 BDRVVmdkState *s = bs->opaque;
2097
2098 qemu_co_mutex_lock(&s->lock);
2099 /* write zeroes could fail if sectors not aligned to cluster, test it with
2100 * dry_run == true before really updating image */
2101 ret = vmdk_pwritev(bs, offset, bytes, NULL, true, true);
2102 if (!ret) {
2103 ret = vmdk_pwritev(bs, offset, bytes, NULL, true, false);
2104 }
2105 qemu_co_mutex_unlock(&s->lock);
2106 return ret;
2107 }
2108
2109 static int vmdk_init_extent(BlockBackend *blk,
2110 int64_t filesize, bool flat,
2111 bool compress, bool zeroed_grain,
2112 Error **errp)
2113 {
2114 int ret, i;
2115 VMDK4Header header;
2116 uint32_t tmp, magic, grains, gd_sectors, gt_size, gt_count;
2117 uint32_t *gd_buf = NULL;
2118 int gd_buf_size;
2119
2120 if (flat) {
2121 ret = blk_truncate(blk, filesize, false, PREALLOC_MODE_OFF, errp);
2122 goto exit;
2123 }
2124 magic = cpu_to_be32(VMDK4_MAGIC);
2125 memset(&header, 0, sizeof(header));
2126 if (compress) {
2127 header.version = 3;
2128 } else if (zeroed_grain) {
2129 header.version = 2;
2130 } else {
2131 header.version = 1;
2132 }
2133 header.flags = VMDK4_FLAG_RGD | VMDK4_FLAG_NL_DETECT
2134 | (compress ? VMDK4_FLAG_COMPRESS | VMDK4_FLAG_MARKER : 0)
2135 | (zeroed_grain ? VMDK4_FLAG_ZERO_GRAIN : 0);
2136 header.compressAlgorithm = compress ? VMDK4_COMPRESSION_DEFLATE : 0;
2137 header.capacity = filesize / BDRV_SECTOR_SIZE;
2138 header.granularity = 128;
2139 header.num_gtes_per_gt = BDRV_SECTOR_SIZE;
2140
2141 grains = DIV_ROUND_UP(filesize / BDRV_SECTOR_SIZE, header.granularity);
2142 gt_size = DIV_ROUND_UP(header.num_gtes_per_gt * sizeof(uint32_t),
2143 BDRV_SECTOR_SIZE);
2144 gt_count = DIV_ROUND_UP(grains, header.num_gtes_per_gt);
2145 gd_sectors = DIV_ROUND_UP(gt_count * sizeof(uint32_t), BDRV_SECTOR_SIZE);
2146
2147 header.desc_offset = 1;
2148 header.desc_size = 20;
2149 header.rgd_offset = header.desc_offset + header.desc_size;
2150 header.gd_offset = header.rgd_offset + gd_sectors + (gt_size * gt_count);
2151 header.grain_offset =
2152 ROUND_UP(header.gd_offset + gd_sectors + (gt_size * gt_count),
2153 header.granularity);
2154 /* swap endianness for all header fields */
2155 header.version = cpu_to_le32(header.version);
2156 header.flags = cpu_to_le32(header.flags);
2157 header.capacity = cpu_to_le64(header.capacity);
2158 header.granularity = cpu_to_le64(header.granularity);
2159 header.num_gtes_per_gt = cpu_to_le32(header.num_gtes_per_gt);
2160 header.desc_offset = cpu_to_le64(header.desc_offset);
2161 header.desc_size = cpu_to_le64(header.desc_size);
2162 header.rgd_offset = cpu_to_le64(header.rgd_offset);
2163 header.gd_offset = cpu_to_le64(header.gd_offset);
2164 header.grain_offset = cpu_to_le64(header.grain_offset);
2165 header.compressAlgorithm = cpu_to_le16(header.compressAlgorithm);
2166
2167 header.check_bytes[0] = 0xa;
2168 header.check_bytes[1] = 0x20;
2169 header.check_bytes[2] = 0xd;
2170 header.check_bytes[3] = 0xa;
2171
2172 /* write all the data */
2173 ret = blk_pwrite(blk, 0, &magic, sizeof(magic), 0);
2174 if (ret < 0) {
2175 error_setg(errp, QERR_IO_ERROR);
2176 goto exit;
2177 }
2178 ret = blk_pwrite(blk, sizeof(magic), &header, sizeof(header), 0);
2179 if (ret < 0) {
2180 error_setg(errp, QERR_IO_ERROR);
2181 goto exit;
2182 }
2183
2184 ret = blk_truncate(blk, le64_to_cpu(header.grain_offset) << 9, false,
2185 PREALLOC_MODE_OFF, errp);
2186 if (ret < 0) {
2187 goto exit;
2188 }
2189
2190 /* write grain directory */
2191 gd_buf_size = gd_sectors * BDRV_SECTOR_SIZE;
2192 gd_buf = g_malloc0(gd_buf_size);
2193 for (i = 0, tmp = le64_to_cpu(header.rgd_offset) + gd_sectors;
2194 i < gt_count; i++, tmp += gt_size) {
2195 gd_buf[i] = cpu_to_le32(tmp);
2196 }
2197 ret = blk_pwrite(blk, le64_to_cpu(header.rgd_offset) * BDRV_SECTOR_SIZE,
2198 gd_buf, gd_buf_size, 0);
2199 if (ret < 0) {
2200 error_setg(errp, QERR_IO_ERROR);
2201 goto exit;
2202 }
2203
2204 /* write backup grain directory */
2205 for (i = 0, tmp = le64_to_cpu(header.gd_offset) + gd_sectors;
2206 i < gt_count; i++, tmp += gt_size) {
2207 gd_buf[i] = cpu_to_le32(tmp);
2208 }
2209 ret = blk_pwrite(blk, le64_to_cpu(header.gd_offset) * BDRV_SECTOR_SIZE,
2210 gd_buf, gd_buf_size, 0);
2211 if (ret < 0) {
2212 error_setg(errp, QERR_IO_ERROR);
2213 }
2214
2215 ret = 0;
2216 exit:
2217 g_free(gd_buf);
2218 return ret;
2219 }
2220
2221 static int vmdk_create_extent(const char *filename, int64_t filesize,
2222 bool flat, bool compress, bool zeroed_grain,
2223 BlockBackend **pbb,
2224 QemuOpts *opts, Error **errp)
2225 {
2226 int ret;
2227 BlockBackend *blk = NULL;
2228 Error *local_err = NULL;
2229
2230 ret = bdrv_create_file(filename, opts, &local_err);
2231 if (ret < 0) {
2232 error_propagate(errp, local_err);
2233 goto exit;
2234 }
2235
2236 blk = blk_new_open(filename, NULL, NULL,
2237 BDRV_O_RDWR | BDRV_O_RESIZE | BDRV_O_PROTOCOL,
2238 &local_err);
2239 if (blk == NULL) {
2240 error_propagate(errp, local_err);
2241 ret = -EIO;
2242 goto exit;
2243 }
2244
2245 blk_set_allow_write_beyond_eof(blk, true);
2246
2247 ret = vmdk_init_extent(blk, filesize, flat, compress, zeroed_grain, errp);
2248 exit:
2249 if (blk) {
2250 if (pbb) {
2251 *pbb = blk;
2252 } else {
2253 blk_unref(blk);
2254 blk = NULL;
2255 }
2256 }
2257 return ret;
2258 }
2259
2260 static int filename_decompose(const char *filename, char *path, char *prefix,
2261 char *postfix, size_t buf_len, Error **errp)
2262 {
2263 const char *p, *q;
2264
2265 if (filename == NULL || !strlen(filename)) {
2266 error_setg(errp, "No filename provided");
2267 return VMDK_ERROR;
2268 }
2269 p = strrchr(filename, '/');
2270 if (p == NULL) {
2271 p = strrchr(filename, '\\');
2272 }
2273 if (p == NULL) {
2274 p = strrchr(filename, ':');
2275 }
2276 if (p != NULL) {
2277 p++;
2278 if (p - filename >= buf_len) {
2279 return VMDK_ERROR;
2280 }
2281 pstrcpy(path, p - filename + 1, filename);
2282 } else {
2283 p = filename;
2284 path[0] = '\0';
2285 }
2286 q = strrchr(p, '.');
2287 if (q == NULL) {
2288 pstrcpy(prefix, buf_len, p);
2289 postfix[0] = '\0';
2290 } else {
2291 if (q - p >= buf_len) {
2292 return VMDK_ERROR;
2293 }
2294 pstrcpy(prefix, q - p + 1, p);
2295 pstrcpy(postfix, buf_len, q);
2296 }
2297 return VMDK_OK;
2298 }
2299
2300 /*
2301 * idx == 0: get or create the descriptor file (also the image file if in a
2302 * non-split format.
2303 * idx >= 1: get the n-th extent if in a split subformat
2304 */
2305 typedef BlockBackend *(*vmdk_create_extent_fn)(int64_t size,
2306 int idx,
2307 bool flat,
2308 bool split,
2309 bool compress,
2310 bool zeroed_grain,
2311 void *opaque,
2312 Error **errp);
2313
2314 static void vmdk_desc_add_extent(GString *desc,
2315 const char *extent_line_fmt,
2316 int64_t size, const char *filename)
2317 {
2318 char *basename = g_path_get_basename(filename);
2319
2320 g_string_append_printf(desc, extent_line_fmt,
2321 DIV_ROUND_UP(size, BDRV_SECTOR_SIZE), basename);
2322 g_free(basename);
2323 }
2324
2325 static int coroutine_fn vmdk_co_do_create(int64_t size,
2326 BlockdevVmdkSubformat subformat,
2327 BlockdevVmdkAdapterType adapter_type,
2328 const char *backing_file,
2329 const char *hw_version,
2330 bool compat6,
2331 bool zeroed_grain,
2332 vmdk_create_extent_fn extent_fn,
2333 void *opaque,
2334 Error **errp)
2335 {
2336 int extent_idx;
2337 BlockBackend *blk = NULL;
2338 BlockBackend *extent_blk;
2339 Error *local_err = NULL;
2340 char *desc = NULL;
2341 int ret = 0;
2342 bool flat, split, compress;
2343 GString *ext_desc_lines;
2344 const int64_t split_size = 0x80000000; /* VMDK has constant split size */
2345 int64_t extent_size;
2346 int64_t created_size = 0;
2347 const char *extent_line_fmt;
2348 char *parent_desc_line = g_malloc0(BUF_SIZE);
2349 uint32_t parent_cid = 0xffffffff;
2350 uint32_t number_heads = 16;
2351 uint32_t desc_offset = 0, desc_len;
2352 const char desc_template[] =
2353 "# Disk DescriptorFile\n"
2354 "version=1\n"
2355 "CID=%" PRIx32 "\n"
2356 "parentCID=%" PRIx32 "\n"
2357 "createType=\"%s\"\n"
2358 "%s"
2359 "\n"
2360 "# Extent description\n"
2361 "%s"
2362 "\n"
2363 "# The Disk Data Base\n"
2364 "#DDB\n"
2365 "\n"
2366 "ddb.virtualHWVersion = \"%s\"\n"
2367 "ddb.geometry.cylinders = \"%" PRId64 "\"\n"
2368 "ddb.geometry.heads = \"%" PRIu32 "\"\n"
2369 "ddb.geometry.sectors = \"63\"\n"
2370 "ddb.adapterType = \"%s\"\n";
2371
2372 ext_desc_lines = g_string_new(NULL);
2373
2374 /* Read out options */
2375 if (compat6) {
2376 if (hw_version) {
2377 error_setg(errp,
2378 "compat6 cannot be enabled with hwversion set");
2379 ret = -EINVAL;
2380 goto exit;
2381 }
2382 hw_version = "6";
2383 }
2384 if (!hw_version) {
2385 hw_version = "4";
2386 }
2387
2388 if (adapter_type != BLOCKDEV_VMDK_ADAPTER_TYPE_IDE) {
2389 /* that's the number of heads with which vmware operates when
2390 creating, exporting, etc. vmdk files with a non-ide adapter type */
2391 number_heads = 255;
2392 }
2393 split = (subformat == BLOCKDEV_VMDK_SUBFORMAT_TWOGBMAXEXTENTFLAT) ||
2394 (subformat == BLOCKDEV_VMDK_SUBFORMAT_TWOGBMAXEXTENTSPARSE);
2395 flat = (subformat == BLOCKDEV_VMDK_SUBFORMAT_MONOLITHICFLAT) ||
2396 (subformat == BLOCKDEV_VMDK_SUBFORMAT_TWOGBMAXEXTENTFLAT);
2397 compress = subformat == BLOCKDEV_VMDK_SUBFORMAT_STREAMOPTIMIZED;
2398
2399 if (flat) {
2400 extent_line_fmt = "RW %" PRId64 " FLAT \"%s\" 0\n";
2401 } else {
2402 extent_line_fmt = "RW %" PRId64 " SPARSE \"%s\"\n";
2403 }
2404 if (flat && backing_file) {
2405 error_setg(errp, "Flat image can't have backing file");
2406 ret = -ENOTSUP;
2407 goto exit;
2408 }
2409 if (flat && zeroed_grain) {
2410 error_setg(errp, "Flat image can't enable zeroed grain");
2411 ret = -ENOTSUP;
2412 goto exit;
2413 }
2414
2415 /* Create extents */
2416 if (split) {
2417 extent_size = split_size;
2418 } else {
2419 extent_size = size;
2420 }
2421 if (!split && !flat) {
2422 created_size = extent_size;
2423 } else {
2424 created_size = 0;
2425 }
2426 /* Get the descriptor file BDS */
2427 blk = extent_fn(created_size, 0, flat, split, compress, zeroed_grain,
2428 opaque, errp);
2429 if (!blk) {
2430 ret = -EIO;
2431 goto exit;
2432 }
2433 if (!split && !flat) {
2434 vmdk_desc_add_extent(ext_desc_lines, extent_line_fmt, created_size,
2435 blk_bs(blk)->filename);
2436 }
2437
2438 if (backing_file) {
2439 BlockBackend *backing;
2440 char *full_backing =
2441 bdrv_get_full_backing_filename_from_filename(blk_bs(blk)->filename,
2442 backing_file,
2443 &local_err);
2444 if (local_err) {
2445 error_propagate(errp, local_err);
2446 ret = -ENOENT;
2447 goto exit;
2448 }
2449 assert(full_backing);
2450
2451 backing = blk_new_open(full_backing, NULL, NULL,
2452 BDRV_O_NO_BACKING, errp);
2453 g_free(full_backing);
2454 if (backing == NULL) {
2455 ret = -EIO;
2456 goto exit;
2457 }
2458 if (strcmp(blk_bs(backing)->drv->format_name, "vmdk")) {
2459 error_setg(errp, "Invalid backing file format: %s. Must be vmdk",
2460 blk_bs(backing)->drv->format_name);
2461 blk_unref(backing);
2462 ret = -EINVAL;
2463 goto exit;
2464 }
2465 ret = vmdk_read_cid(blk_bs(backing), 0, &parent_cid);
2466 blk_unref(backing);
2467 if (ret) {
2468 error_setg(errp, "Failed to read parent CID");
2469 goto exit;
2470 }
2471 snprintf(parent_desc_line, BUF_SIZE,
2472 "parentFileNameHint=\"%s\"", backing_file);
2473 }
2474 extent_idx = 1;
2475 while (created_size < size) {
2476 int64_t cur_size = MIN(size - created_size, extent_size);
2477 extent_blk = extent_fn(cur_size, extent_idx, flat, split, compress,
2478 zeroed_grain, opaque, errp);
2479 if (!extent_blk) {
2480 ret = -EINVAL;
2481 goto exit;
2482 }
2483 vmdk_desc_add_extent(ext_desc_lines, extent_line_fmt, cur_size,
2484 blk_bs(extent_blk)->filename);
2485 created_size += cur_size;
2486 extent_idx++;
2487 blk_unref(extent_blk);
2488 }
2489
2490 /* Check whether we got excess extents */
2491 extent_blk = extent_fn(-1, extent_idx, flat, split, compress, zeroed_grain,
2492 opaque, NULL);
2493 if (extent_blk) {
2494 blk_unref(extent_blk);
2495 error_setg(errp, "List of extents contains unused extents");
2496 ret = -EINVAL;
2497 goto exit;
2498 }
2499
2500 /* generate descriptor file */
2501 desc = g_strdup_printf(desc_template,
2502 g_random_int(),
2503 parent_cid,
2504 BlockdevVmdkSubformat_str(subformat),
2505 parent_desc_line,
2506 ext_desc_lines->str,
2507 hw_version,
2508 size /
2509 (int64_t)(63 * number_heads * BDRV_SECTOR_SIZE),
2510 number_heads,
2511 BlockdevVmdkAdapterType_str(adapter_type));
2512 desc_len = strlen(desc);
2513 /* the descriptor offset = 0x200 */
2514 if (!split && !flat) {
2515 desc_offset = 0x200;
2516 }
2517
2518 ret = blk_pwrite(blk, desc_offset, desc, desc_len, 0);
2519 if (ret < 0) {
2520 error_setg_errno(errp, -ret, "Could not write description");
2521 goto exit;
2522 }
2523 /* bdrv_pwrite write padding zeros to align to sector, we don't need that
2524 * for description file */
2525 if (desc_offset == 0) {
2526 ret = blk_truncate(blk, desc_len, false, PREALLOC_MODE_OFF, errp);
2527 if (ret < 0) {
2528 goto exit;
2529 }
2530 }
2531 ret = 0;
2532 exit:
2533 if (blk) {
2534 blk_unref(blk);
2535 }
2536 g_free(desc);
2537 g_free(parent_desc_line);
2538 g_string_free(ext_desc_lines, true);
2539 return ret;
2540 }
2541
2542 typedef struct {
2543 char *path;
2544 char *prefix;
2545 char *postfix;
2546 QemuOpts *opts;
2547 } VMDKCreateOptsData;
2548
2549 static BlockBackend *vmdk_co_create_opts_cb(int64_t size, int idx,
2550 bool flat, bool split, bool compress,
2551 bool zeroed_grain, void *opaque,
2552 Error **errp)
2553 {
2554 BlockBackend *blk = NULL;
2555 BlockDriverState *bs = NULL;
2556 VMDKCreateOptsData *data = opaque;
2557 char *ext_filename = NULL;
2558 char *rel_filename = NULL;
2559
2560 /* We're done, don't create excess extents. */
2561 if (size == -1) {
2562 assert(errp == NULL);
2563 return NULL;
2564 }
2565
2566 if (idx == 0) {
2567 rel_filename = g_strdup_printf("%s%s", data->prefix, data->postfix);
2568 } else if (split) {
2569 rel_filename = g_strdup_printf("%s-%c%03d%s",
2570 data->prefix,
2571 flat ? 'f' : 's', idx, data->postfix);
2572 } else {
2573 assert(idx == 1);
2574 rel_filename = g_strdup_printf("%s-flat%s", data->prefix, data->postfix);
2575 }
2576
2577 ext_filename = g_strdup_printf("%s%s", data->path, rel_filename);
2578 g_free(rel_filename);
2579
2580 if (vmdk_create_extent(ext_filename, size,
2581 flat, compress, zeroed_grain, &blk, data->opts,
2582 errp)) {
2583 goto exit;
2584 }
2585 bdrv_unref(bs);
2586 exit:
2587 g_free(ext_filename);
2588 return blk;
2589 }
2590
2591 static int coroutine_fn vmdk_co_create_opts(const char *filename, QemuOpts *opts,
2592 Error **errp)
2593 {
2594 Error *local_err = NULL;
2595 char *desc = NULL;
2596 int64_t total_size = 0;
2597 char *adapter_type = NULL;
2598 BlockdevVmdkAdapterType adapter_type_enum;
2599 char *backing_file = NULL;
2600 char *hw_version = NULL;
2601 char *fmt = NULL;
2602 BlockdevVmdkSubformat subformat;
2603 int ret = 0;
2604 char *path = g_malloc0(PATH_MAX);
2605 char *prefix = g_malloc0(PATH_MAX);
2606 char *postfix = g_malloc0(PATH_MAX);
2607 char *desc_line = g_malloc0(BUF_SIZE);
2608 char *ext_filename = g_malloc0(PATH_MAX);
2609 char *desc_filename = g_malloc0(PATH_MAX);
2610 char *parent_desc_line = g_malloc0(BUF_SIZE);
2611 bool zeroed_grain;
2612 bool compat6;
2613 VMDKCreateOptsData data;
2614
2615 if (filename_decompose(filename, path, prefix, postfix, PATH_MAX, errp)) {
2616 ret = -EINVAL;
2617 goto exit;
2618 }
2619 /* Read out options */
2620 total_size = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0),
2621 BDRV_SECTOR_SIZE);
2622 adapter_type = qemu_opt_get_del(opts, BLOCK_OPT_ADAPTER_TYPE);
2623 backing_file = qemu_opt_get_del(opts, BLOCK_OPT_BACKING_FILE);
2624 hw_version = qemu_opt_get_del(opts, BLOCK_OPT_HWVERSION);
2625 compat6 = qemu_opt_get_bool_del(opts, BLOCK_OPT_COMPAT6, false);
2626 if (strcmp(hw_version, "undefined") == 0) {
2627 g_free(hw_version);
2628 hw_version = NULL;
2629 }
2630 fmt = qemu_opt_get_del(opts, BLOCK_OPT_SUBFMT);
2631 zeroed_grain = qemu_opt_get_bool_del(opts, BLOCK_OPT_ZEROED_GRAIN, false);
2632
2633 if (adapter_type) {
2634 adapter_type_enum = qapi_enum_parse(&BlockdevVmdkAdapterType_lookup,
2635 adapter_type,
2636 BLOCKDEV_VMDK_ADAPTER_TYPE_IDE,
2637 &local_err);
2638 if (local_err) {
2639 error_propagate(errp, local_err);
2640 ret = -EINVAL;
2641 goto exit;
2642 }
2643 } else {
2644 adapter_type_enum = BLOCKDEV_VMDK_ADAPTER_TYPE_IDE;
2645 }
2646
2647 if (!fmt) {
2648 /* Default format to monolithicSparse */
2649 subformat = BLOCKDEV_VMDK_SUBFORMAT_MONOLITHICSPARSE;
2650 } else {
2651 subformat = qapi_enum_parse(&BlockdevVmdkSubformat_lookup,
2652 fmt,
2653 BLOCKDEV_VMDK_SUBFORMAT_MONOLITHICSPARSE,
2654 &local_err);
2655 if (local_err) {
2656 error_propagate(errp, local_err);
2657 ret = -EINVAL;
2658 goto exit;
2659 }
2660 }
2661 data = (VMDKCreateOptsData){
2662 .prefix = prefix,
2663 .postfix = postfix,
2664 .path = path,
2665 .opts = opts,
2666 };
2667 ret = vmdk_co_do_create(total_size, subformat, adapter_type_enum,
2668 backing_file, hw_version, compat6, zeroed_grain,
2669 vmdk_co_create_opts_cb, &data, errp);
2670
2671 exit:
2672 g_free(adapter_type);
2673 g_free(backing_file);
2674 g_free(hw_version);
2675 g_free(fmt);
2676 g_free(desc);
2677 g_free(path);
2678 g_free(prefix);
2679 g_free(postfix);
2680 g_free(desc_line);
2681 g_free(ext_filename);
2682 g_free(desc_filename);
2683 g_free(parent_desc_line);
2684 return ret;
2685 }
2686
2687 static BlockBackend *vmdk_co_create_cb(int64_t size, int idx,
2688 bool flat, bool split, bool compress,
2689 bool zeroed_grain, void *opaque,
2690 Error **errp)
2691 {
2692 int ret;
2693 BlockDriverState *bs;
2694 BlockBackend *blk;
2695 BlockdevCreateOptionsVmdk *opts = opaque;
2696
2697 if (idx == 0) {
2698 bs = bdrv_open_blockdev_ref(opts->file, errp);
2699 } else {
2700 int i;
2701 BlockdevRefList *list = opts->extents;
2702 for (i = 1; i < idx; i++) {
2703 if (!list || !list->next) {
2704 error_setg(errp, "Extent [%d] not specified", i);
2705 return NULL;
2706 }
2707 list = list->next;
2708 }
2709 if (!list) {
2710 error_setg(errp, "Extent [%d] not specified", idx - 1);
2711 return NULL;
2712 }
2713 bs = bdrv_open_blockdev_ref(list->value, errp);
2714 }
2715 if (!bs) {
2716 return NULL;
2717 }
2718 blk = blk_new(bdrv_get_aio_context(bs),
2719 BLK_PERM_CONSISTENT_READ | BLK_PERM_WRITE | BLK_PERM_RESIZE,
2720 BLK_PERM_ALL);
2721 if (blk_insert_bs(blk, bs, errp)) {
2722 bdrv_unref(bs);
2723 return NULL;
2724 }
2725 blk_set_allow_write_beyond_eof(blk, true);
2726 bdrv_unref(bs);
2727
2728 if (size != -1) {
2729 ret = vmdk_init_extent(blk, size, flat, compress, zeroed_grain, errp);
2730 if (ret) {
2731 blk_unref(blk);
2732 blk = NULL;
2733 }
2734 }
2735 return blk;
2736 }
2737
2738 static int coroutine_fn vmdk_co_create(BlockdevCreateOptions *create_options,
2739 Error **errp)
2740 {
2741 int ret;
2742 BlockdevCreateOptionsVmdk *opts;
2743
2744 opts = &create_options->u.vmdk;
2745
2746 /* Validate options */
2747 if (!QEMU_IS_ALIGNED(opts->size, BDRV_SECTOR_SIZE)) {
2748 error_setg(errp, "Image size must be a multiple of 512 bytes");
2749 ret = -EINVAL;
2750 goto out;
2751 }
2752
2753 ret = vmdk_co_do_create(opts->size,
2754 opts->subformat,
2755 opts->adapter_type,
2756 opts->backing_file,
2757 opts->hwversion,
2758 false,
2759 opts->zeroed_grain,
2760 vmdk_co_create_cb,
2761 opts, errp);
2762 return ret;
2763
2764 out:
2765 return ret;
2766 }
2767
2768 static void vmdk_close(BlockDriverState *bs)
2769 {
2770 BDRVVmdkState *s = bs->opaque;
2771
2772 vmdk_free_extents(bs);
2773 g_free(s->create_type);
2774
2775 migrate_del_blocker(s->migration_blocker);
2776 error_free(s->migration_blocker);
2777 }
2778
2779 static coroutine_fn int vmdk_co_flush(BlockDriverState *bs)
2780 {
2781 BDRVVmdkState *s = bs->opaque;
2782 int i, err;
2783 int ret = 0;
2784
2785 for (i = 0; i < s->num_extents; i++) {
2786 err = bdrv_co_flush(s->extents[i].file->bs);
2787 if (err < 0) {
2788 ret = err;
2789 }
2790 }
2791 return ret;
2792 }
2793
2794 static int64_t vmdk_get_allocated_file_size(BlockDriverState *bs)
2795 {
2796 int i;
2797 int64_t ret = 0;
2798 int64_t r;
2799 BDRVVmdkState *s = bs->opaque;
2800
2801 ret = bdrv_get_allocated_file_size(bs->file->bs);
2802 if (ret < 0) {
2803 return ret;
2804 }
2805 for (i = 0; i < s->num_extents; i++) {
2806 if (s->extents[i].file == bs->file) {
2807 continue;
2808 }
2809 r = bdrv_get_allocated_file_size(s->extents[i].file->bs);
2810 if (r < 0) {
2811 return r;
2812 }
2813 ret += r;
2814 }
2815 return ret;
2816 }
2817
2818 static int vmdk_has_zero_init(BlockDriverState *bs)
2819 {
2820 int i;
2821 BDRVVmdkState *s = bs->opaque;
2822
2823 /* If has a flat extent and its underlying storage doesn't have zero init,
2824 * return 0. */
2825 for (i = 0; i < s->num_extents; i++) {
2826 if (s->extents[i].flat) {
2827 if (!bdrv_has_zero_init(s->extents[i].file->bs)) {
2828 return 0;
2829 }
2830 }
2831 }
2832 return 1;
2833 }
2834
2835 static ImageInfo *vmdk_get_extent_info(VmdkExtent *extent)
2836 {
2837 ImageInfo *info = g_new0(ImageInfo, 1);
2838
2839 bdrv_refresh_filename(extent->file->bs);
2840 *info = (ImageInfo){
2841 .filename = g_strdup(extent->file->bs->filename),
2842 .format = g_strdup(extent->type),
2843 .virtual_size = extent->sectors * BDRV_SECTOR_SIZE,
2844 .compressed = extent->compressed,
2845 .has_compressed = extent->compressed,
2846 .cluster_size = extent->cluster_sectors * BDRV_SECTOR_SIZE,
2847 .has_cluster_size = !extent->flat,
2848 };
2849
2850 return info;
2851 }
2852
2853 static int coroutine_fn vmdk_co_check(BlockDriverState *bs,
2854 BdrvCheckResult *result,
2855 BdrvCheckMode fix)
2856 {
2857 BDRVVmdkState *s = bs->opaque;
2858 VmdkExtent *extent = NULL;
2859 int64_t sector_num = 0;
2860 int64_t total_sectors = bdrv_nb_sectors(bs);
2861 int ret;
2862 uint64_t cluster_offset;
2863
2864 if (fix) {
2865 return -ENOTSUP;
2866 }
2867
2868 for (;;) {
2869 if (sector_num >= total_sectors) {
2870 return 0;
2871 }
2872 extent = find_extent(s, sector_num, extent);
2873 if (!extent) {
2874 fprintf(stderr,
2875 "ERROR: could not find extent for sector %" PRId64 "\n",
2876 sector_num);
2877 ret = -EINVAL;
2878 break;
2879 }
2880 ret = get_cluster_offset(bs, extent, NULL,
2881 sector_num << BDRV_SECTOR_BITS,
2882 false, &cluster_offset, 0, 0);
2883 if (ret == VMDK_ERROR) {
2884 fprintf(stderr,
2885 "ERROR: could not get cluster_offset for sector %"
2886 PRId64 "\n", sector_num);
2887 break;
2888 }
2889 if (ret == VMDK_OK) {
2890 int64_t extent_len = bdrv_getlength(extent->file->bs);
2891 if (extent_len < 0) {
2892 fprintf(stderr,
2893 "ERROR: could not get extent file length for sector %"
2894 PRId64 "\n", sector_num);
2895 ret = extent_len;
2896 break;
2897 }
2898 if (cluster_offset >= extent_len) {
2899 fprintf(stderr,
2900 "ERROR: cluster offset for sector %"
2901 PRId64 " points after EOF\n", sector_num);
2902 ret = -EINVAL;
2903 break;
2904 }
2905 }
2906 sector_num += extent->cluster_sectors;
2907 }
2908
2909 result->corruptions++;
2910 return ret;
2911 }
2912
2913 static ImageInfoSpecific *vmdk_get_specific_info(BlockDriverState *bs,
2914 Error **errp)
2915 {
2916 int i;
2917 BDRVVmdkState *s = bs->opaque;
2918 ImageInfoSpecific *spec_info = g_new0(ImageInfoSpecific, 1);
2919 ImageInfoList **next;
2920
2921 *spec_info = (ImageInfoSpecific){
2922 .type = IMAGE_INFO_SPECIFIC_KIND_VMDK,
2923 .u = {
2924 .vmdk.data = g_new0(ImageInfoSpecificVmdk, 1),
2925 },
2926 };
2927
2928 *spec_info->u.vmdk.data = (ImageInfoSpecificVmdk) {
2929 .create_type = g_strdup(s->create_type),
2930 .cid = s->cid,
2931 .parent_cid = s->parent_cid,
2932 };
2933
2934 next = &spec_info->u.vmdk.data->extents;
2935 for (i = 0; i < s->num_extents; i++) {
2936 *next = g_new0(ImageInfoList, 1);
2937 (*next)->value = vmdk_get_extent_info(&s->extents[i]);
2938 (*next)->next = NULL;
2939 next = &(*next)->next;
2940 }
2941
2942 return spec_info;
2943 }
2944
2945 static bool vmdk_extents_type_eq(const VmdkExtent *a, const VmdkExtent *b)
2946 {
2947 return a->flat == b->flat &&
2948 a->compressed == b->compressed &&
2949 (a->flat || a->cluster_sectors == b->cluster_sectors);
2950 }
2951
2952 static int vmdk_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
2953 {
2954 int i;
2955 BDRVVmdkState *s = bs->opaque;
2956 assert(s->num_extents);
2957
2958 /* See if we have multiple extents but they have different cases */
2959 for (i = 1; i < s->num_extents; i++) {
2960 if (!vmdk_extents_type_eq(&s->extents[0], &s->extents[i])) {
2961 return -ENOTSUP;
2962 }
2963 }
2964 bdi->needs_compressed_writes = s->extents[0].compressed;
2965 if (!s->extents[0].flat) {
2966 bdi->cluster_size = s->extents[0].cluster_sectors << BDRV_SECTOR_BITS;
2967 }
2968 return 0;
2969 }
2970
2971 static void vmdk_gather_child_options(BlockDriverState *bs, QDict *target,
2972 bool backing_overridden)
2973 {
2974 /* No children but file and backing can be explicitly specified (TODO) */
2975 qdict_put(target, "file",
2976 qobject_ref(bs->file->bs->full_open_options));
2977
2978 if (backing_overridden) {
2979 if (bs->backing) {
2980 qdict_put(target, "backing",
2981 qobject_ref(bs->backing->bs->full_open_options));
2982 } else {
2983 qdict_put_null(target, "backing");
2984 }
2985 }
2986 }
2987
2988 static QemuOptsList vmdk_create_opts = {
2989 .name = "vmdk-create-opts",
2990 .head = QTAILQ_HEAD_INITIALIZER(vmdk_create_opts.head),
2991 .desc = {
2992 {
2993 .name = BLOCK_OPT_SIZE,
2994 .type = QEMU_OPT_SIZE,
2995 .help = "Virtual disk size"
2996 },
2997 {
2998 .name = BLOCK_OPT_ADAPTER_TYPE,
2999 .type = QEMU_OPT_STRING,
3000 .help = "Virtual adapter type, can be one of "
3001 "ide (default), lsilogic, buslogic or legacyESX"
3002 },
3003 {
3004 .name = BLOCK_OPT_BACKING_FILE,
3005 .type = QEMU_OPT_STRING,
3006 .help = "File name of a base image"
3007 },
3008 {
3009 .name = BLOCK_OPT_COMPAT6,
3010 .type = QEMU_OPT_BOOL,
3011 .help = "VMDK version 6 image",
3012 .def_value_str = "off"
3013 },
3014 {
3015 .name = BLOCK_OPT_HWVERSION,
3016 .type = QEMU_OPT_STRING,
3017 .help = "VMDK hardware version",
3018 .def_value_str = "undefined"
3019 },
3020 {
3021 .name = BLOCK_OPT_SUBFMT,
3022 .type = QEMU_OPT_STRING,
3023 .help =
3024 "VMDK flat extent format, can be one of "
3025 "{monolithicSparse (default) | monolithicFlat | twoGbMaxExtentSparse | twoGbMaxExtentFlat | streamOptimized} "
3026 },
3027 {
3028 .name = BLOCK_OPT_ZEROED_GRAIN,
3029 .type = QEMU_OPT_BOOL,
3030 .help = "Enable efficient zero writes "
3031 "using the zeroed-grain GTE feature"
3032 },
3033 { /* end of list */ }
3034 }
3035 };
3036
3037 static BlockDriver bdrv_vmdk = {
3038 .format_name = "vmdk",
3039 .instance_size = sizeof(BDRVVmdkState),
3040 .bdrv_probe = vmdk_probe,
3041 .bdrv_open = vmdk_open,
3042 .bdrv_co_check = vmdk_co_check,
3043 .bdrv_reopen_prepare = vmdk_reopen_prepare,
3044 .bdrv_child_perm = bdrv_format_default_perms,
3045 .bdrv_co_preadv = vmdk_co_preadv,
3046 .bdrv_co_pwritev = vmdk_co_pwritev,
3047 .bdrv_co_pwritev_compressed = vmdk_co_pwritev_compressed,
3048 .bdrv_co_pwrite_zeroes = vmdk_co_pwrite_zeroes,
3049 .bdrv_close = vmdk_close,
3050 .bdrv_co_create_opts = vmdk_co_create_opts,
3051 .bdrv_co_create = vmdk_co_create,
3052 .bdrv_co_flush_to_disk = vmdk_co_flush,
3053 .bdrv_co_block_status = vmdk_co_block_status,
3054 .bdrv_get_allocated_file_size = vmdk_get_allocated_file_size,
3055 .bdrv_has_zero_init = vmdk_has_zero_init,
3056 .bdrv_get_specific_info = vmdk_get_specific_info,
3057 .bdrv_refresh_limits = vmdk_refresh_limits,
3058 .bdrv_get_info = vmdk_get_info,
3059 .bdrv_gather_child_options = vmdk_gather_child_options,
3060
3061 .supports_backing = true,
3062 .create_opts = &vmdk_create_opts,
3063 };
3064
3065 static void bdrv_vmdk_init(void)
3066 {
3067 bdrv_register(&bdrv_vmdk);
3068 }
3069
3070 block_init(bdrv_vmdk_init);
AR7 emulation for QEMU