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linux-user: Add LoongArch elf support
[qemu/rayw.git] / block / vmdk.c
blob38e5ab380693984b6f10ced5e10dd9150db7aaf8
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 "qemu/memalign.h"
37 #include "migration/blocker.h"
38 #include "qemu/cutils.h"
39 #include <zlib.h>
40
41 #define VMDK3_MAGIC (('C' << 24) | ('O' << 16) | ('W' << 8) | 'D')
42 #define VMDK4_MAGIC (('K' << 24) | ('D' << 16) | ('M' << 8) | 'V')
43 #define VMDK4_COMPRESSION_DEFLATE 1
44 #define VMDK4_FLAG_NL_DETECT (1 << 0)
45 #define VMDK4_FLAG_RGD (1 << 1)
46 /* Zeroed-grain enable bit */
47 #define VMDK4_FLAG_ZERO_GRAIN (1 << 2)
48 #define VMDK4_FLAG_COMPRESS (1 << 16)
49 #define VMDK4_FLAG_MARKER (1 << 17)
50 #define VMDK4_GD_AT_END 0xffffffffffffffffULL
51
52 #define VMDK_EXTENT_MAX_SECTORS (1ULL << 32)
53
54 #define VMDK_GTE_ZEROED 0x1
55
56 /* VMDK internal error codes */
57 #define VMDK_OK 0
58 #define VMDK_ERROR (-1)
59 /* Cluster not allocated */
60 #define VMDK_UNALLOC (-2)
61 #define VMDK_ZEROED (-3)
62
63 #define BLOCK_OPT_ZEROED_GRAIN "zeroed_grain"
64 #define BLOCK_OPT_TOOLSVERSION "toolsversion"
65
66 typedef struct {
67 uint32_t version;
68 uint32_t flags;
69 uint32_t disk_sectors;
70 uint32_t granularity;
71 uint32_t l1dir_offset;
72 uint32_t l1dir_size;
73 uint32_t file_sectors;
74 uint32_t cylinders;
75 uint32_t heads;
76 uint32_t sectors_per_track;
77 } QEMU_PACKED VMDK3Header;
78
79 typedef struct {
80 uint32_t version;
81 uint32_t flags;
82 uint64_t capacity;
83 uint64_t granularity;
84 uint64_t desc_offset;
85 uint64_t desc_size;
86 /* Number of GrainTableEntries per GrainTable */
87 uint32_t num_gtes_per_gt;
88 uint64_t rgd_offset;
89 uint64_t gd_offset;
90 uint64_t grain_offset;
91 char filler[1];
92 char check_bytes[4];
93 uint16_t compressAlgorithm;
94 } QEMU_PACKED VMDK4Header;
95
96 typedef struct VMDKSESparseConstHeader {
97 uint64_t magic;
98 uint64_t version;
99 uint64_t capacity;
100 uint64_t grain_size;
101 uint64_t grain_table_size;
102 uint64_t flags;
103 uint64_t reserved1;
104 uint64_t reserved2;
105 uint64_t reserved3;
106 uint64_t reserved4;
107 uint64_t volatile_header_offset;
108 uint64_t volatile_header_size;
109 uint64_t journal_header_offset;
110 uint64_t journal_header_size;
111 uint64_t journal_offset;
112 uint64_t journal_size;
113 uint64_t grain_dir_offset;
114 uint64_t grain_dir_size;
115 uint64_t grain_tables_offset;
116 uint64_t grain_tables_size;
117 uint64_t free_bitmap_offset;
118 uint64_t free_bitmap_size;
119 uint64_t backmap_offset;
120 uint64_t backmap_size;
121 uint64_t grains_offset;
122 uint64_t grains_size;
123 uint8_t pad[304];
124 } QEMU_PACKED VMDKSESparseConstHeader;
125
126 typedef struct VMDKSESparseVolatileHeader {
127 uint64_t magic;
128 uint64_t free_gt_number;
129 uint64_t next_txn_seq_number;
130 uint64_t replay_journal;
131 uint8_t pad[480];
132 } QEMU_PACKED VMDKSESparseVolatileHeader;
133
134 #define L2_CACHE_SIZE 16
135
136 typedef struct VmdkExtent {
137 BdrvChild *file;
138 bool flat;
139 bool compressed;
140 bool has_marker;
141 bool has_zero_grain;
142 bool sesparse;
143 uint64_t sesparse_l2_tables_offset;
144 uint64_t sesparse_clusters_offset;
145 int32_t entry_size;
146 int version;
147 int64_t sectors;
148 int64_t end_sector;
149 int64_t flat_start_offset;
150 int64_t l1_table_offset;
151 int64_t l1_backup_table_offset;
152 void *l1_table;
153 uint32_t *l1_backup_table;
154 unsigned int l1_size;
155 uint32_t l1_entry_sectors;
156
157 unsigned int l2_size;
158 void *l2_cache;
159 uint32_t l2_cache_offsets[L2_CACHE_SIZE];
160 uint32_t l2_cache_counts[L2_CACHE_SIZE];
161
162 int64_t cluster_sectors;
163 int64_t next_cluster_sector;
164 char *type;
165 } VmdkExtent;
166
167 typedef struct BDRVVmdkState {
168 CoMutex lock;
169 uint64_t desc_offset;
170 bool cid_updated;
171 bool cid_checked;
172 uint32_t cid;
173 uint32_t parent_cid;
174 int num_extents;
175 /* Extent array with num_extents entries, ascend ordered by address */
176 VmdkExtent *extents;
177 Error *migration_blocker;
178 char *create_type;
179 } BDRVVmdkState;
180
181 typedef struct BDRVVmdkReopenState {
182 bool *extents_using_bs_file;
183 } BDRVVmdkReopenState;
184
185 typedef struct VmdkMetaData {
186 unsigned int l1_index;
187 unsigned int l2_index;
188 unsigned int l2_offset;
189 bool new_allocation;
190 uint32_t *l2_cache_entry;
191 } VmdkMetaData;
192
193 typedef struct VmdkGrainMarker {
194 uint64_t lba;
195 uint32_t size;
196 uint8_t data[];
197 } QEMU_PACKED VmdkGrainMarker;
198
199 enum {
200 MARKER_END_OF_STREAM = 0,
201 MARKER_GRAIN_TABLE = 1,
202 MARKER_GRAIN_DIRECTORY = 2,
203 MARKER_FOOTER = 3,
204 };
205
206 static int vmdk_probe(const uint8_t *buf, int buf_size, const char *filename)
207 {
208 uint32_t magic;
209
210 if (buf_size < 4) {
211 return 0;
212 }
213 magic = be32_to_cpu(*(uint32_t *)buf);
214 if (magic == VMDK3_MAGIC ||
215 magic == VMDK4_MAGIC) {
216 return 100;
217 } else {
218 const char *p = (const char *)buf;
219 const char *end = p + buf_size;
220 while (p < end) {
221 if (*p == '#') {
222 /* skip comment line */
223 while (p < end && *p != '\n') {
224 p++;
225 }
226 p++;
227 continue;
228 }
229 if (*p == ' ') {
230 while (p < end && *p == ' ') {
231 p++;
232 }
233 /* skip '\r' if windows line endings used. */
234 if (p < end && *p == '\r') {
235 p++;
236 }
237 /* only accept blank lines before 'version=' line */
238 if (p == end || *p != '\n') {
239 return 0;
240 }
241 p++;
242 continue;
243 }
244 if (end - p >= strlen("version=X\n")) {
245 if (strncmp("version=1\n", p, strlen("version=1\n")) == 0 ||
246 strncmp("version=2\n", p, strlen("version=2\n")) == 0 ||
247 strncmp("version=3\n", p, strlen("version=3\n")) == 0) {
248 return 100;
249 }
250 }
251 if (end - p >= strlen("version=X\r\n")) {
252 if (strncmp("version=1\r\n", p, strlen("version=1\r\n")) == 0 ||
253 strncmp("version=2\r\n", p, strlen("version=2\r\n")) == 0 ||
254 strncmp("version=3\r\n", p, strlen("version=3\r\n")) == 0) {
255 return 100;
256 }
257 }
258 return 0;
259 }
260 return 0;
261 }
262 }
263
264 #define SECTOR_SIZE 512
265 #define DESC_SIZE (20 * SECTOR_SIZE) /* 20 sectors of 512 bytes each */
266 #define BUF_SIZE 4096
267 #define HEADER_SIZE 512 /* first sector of 512 bytes */
268
269 static void vmdk_free_extents(BlockDriverState *bs)
270 {
271 int i;
272 BDRVVmdkState *s = bs->opaque;
273 VmdkExtent *e;
274
275 for (i = 0; i < s->num_extents; i++) {
276 e = &s->extents[i];
277 g_free(e->l1_table);
278 g_free(e->l2_cache);
279 g_free(e->l1_backup_table);
280 g_free(e->type);
281 if (e->file != bs->file) {
282 bdrv_unref_child(bs, e->file);
283 }
284 }
285 g_free(s->extents);
286 }
287
288 static void vmdk_free_last_extent(BlockDriverState *bs)
289 {
290 BDRVVmdkState *s = bs->opaque;
291
292 if (s->num_extents == 0) {
293 return;
294 }
295 s->num_extents--;
296 s->extents = g_renew(VmdkExtent, s->extents, s->num_extents);
297 }
298
299 /* Return -ve errno, or 0 on success and write CID into *pcid. */
300 static int vmdk_read_cid(BlockDriverState *bs, int parent, uint32_t *pcid)
301 {
302 char *desc;
303 uint32_t cid;
304 const char *p_name, *cid_str;
305 size_t cid_str_size;
306 BDRVVmdkState *s = bs->opaque;
307 int ret;
308
309 desc = g_malloc0(DESC_SIZE);
310 ret = bdrv_pread(bs->file, s->desc_offset, desc, DESC_SIZE);
311 if (ret < 0) {
312 goto out;
313 }
314
315 if (parent) {
316 cid_str = "parentCID";
317 cid_str_size = sizeof("parentCID");
318 } else {
319 cid_str = "CID";
320 cid_str_size = sizeof("CID");
321 }
322
323 desc[DESC_SIZE - 1] = '\0';
324 p_name = strstr(desc, cid_str);
325 if (p_name == NULL) {
326 ret = -EINVAL;
327 goto out;
328 }
329 p_name += cid_str_size;
330 if (sscanf(p_name, "%" SCNx32, &cid) != 1) {
331 ret = -EINVAL;
332 goto out;
333 }
334 *pcid = cid;
335 ret = 0;
336
337 out:
338 g_free(desc);
339 return ret;
340 }
341
342 static int vmdk_write_cid(BlockDriverState *bs, uint32_t cid)
343 {
344 char *desc, *tmp_desc;
345 char *p_name, *tmp_str;
346 BDRVVmdkState *s = bs->opaque;
347 int ret = 0;
348
349 desc = g_malloc0(DESC_SIZE);
350 tmp_desc = g_malloc0(DESC_SIZE);
351 ret = bdrv_pread(bs->file, s->desc_offset, desc, DESC_SIZE);
352 if (ret < 0) {
353 goto out;
354 }
355
356 desc[DESC_SIZE - 1] = '\0';
357 tmp_str = strstr(desc, "parentCID");
358 if (tmp_str == NULL) {
359 ret = -EINVAL;
360 goto out;
361 }
362
363 pstrcpy(tmp_desc, DESC_SIZE, tmp_str);
364 p_name = strstr(desc, "CID");
365 if (p_name != NULL) {
366 p_name += sizeof("CID");
367 snprintf(p_name, DESC_SIZE - (p_name - desc), "%" PRIx32 "\n", cid);
368 pstrcat(desc, DESC_SIZE, tmp_desc);
369 }
370
371 ret = bdrv_pwrite_sync(bs->file, s->desc_offset, desc, DESC_SIZE);
372
373 out:
374 g_free(desc);
375 g_free(tmp_desc);
376 return ret;
377 }
378
379 static int vmdk_is_cid_valid(BlockDriverState *bs)
380 {
381 BDRVVmdkState *s = bs->opaque;
382 uint32_t cur_pcid;
383
384 if (!s->cid_checked && bs->backing) {
385 BlockDriverState *p_bs = bs->backing->bs;
386
387 if (strcmp(p_bs->drv->format_name, "vmdk")) {
388 /* Backing file is not in vmdk format, so it does not have
389 * a CID, which makes the overlay's parent CID invalid */
390 return 0;
391 }
392
393 if (vmdk_read_cid(p_bs, 0, &cur_pcid) != 0) {
394 /* read failure: report as not valid */
395 return 0;
396 }
397 if (s->parent_cid != cur_pcid) {
398 /* CID not valid */
399 return 0;
400 }
401 }
402 s->cid_checked = true;
403 /* CID valid */
404 return 1;
405 }
406
407 static int vmdk_reopen_prepare(BDRVReopenState *state,
408 BlockReopenQueue *queue, Error **errp)
409 {
410 BDRVVmdkState *s;
411 BDRVVmdkReopenState *rs;
412 int i;
413
414 assert(state != NULL);
415 assert(state->bs != NULL);
416 assert(state->opaque == NULL);
417
418 s = state->bs->opaque;
419
420 rs = g_new0(BDRVVmdkReopenState, 1);
421 state->opaque = rs;
422
423 /*
424 * Check whether there are any extents stored in bs->file; if bs->file
425 * changes, we will need to update their .file pointers to follow suit
426 */
427 rs->extents_using_bs_file = g_new(bool, s->num_extents);
428 for (i = 0; i < s->num_extents; i++) {
429 rs->extents_using_bs_file[i] = s->extents[i].file == state->bs->file;
430 }
431
432 return 0;
433 }
434
435 static void vmdk_reopen_clean(BDRVReopenState *state)
436 {
437 BDRVVmdkReopenState *rs = state->opaque;
438
439 g_free(rs->extents_using_bs_file);
440 g_free(rs);
441 state->opaque = NULL;
442 }
443
444 static void vmdk_reopen_commit(BDRVReopenState *state)
445 {
446 BDRVVmdkState *s = state->bs->opaque;
447 BDRVVmdkReopenState *rs = state->opaque;
448 int i;
449
450 for (i = 0; i < s->num_extents; i++) {
451 if (rs->extents_using_bs_file[i]) {
452 s->extents[i].file = state->bs->file;
453 }
454 }
455
456 vmdk_reopen_clean(state);
457 }
458
459 static void vmdk_reopen_abort(BDRVReopenState *state)
460 {
461 vmdk_reopen_clean(state);
462 }
463
464 static int vmdk_parent_open(BlockDriverState *bs)
465 {
466 char *p_name;
467 char *desc;
468 BDRVVmdkState *s = bs->opaque;
469 int ret;
470
471 desc = g_malloc0(DESC_SIZE + 1);
472 ret = bdrv_pread(bs->file, s->desc_offset, desc, DESC_SIZE);
473 if (ret < 0) {
474 goto out;
475 }
476 ret = 0;
477
478 p_name = strstr(desc, "parentFileNameHint");
479 if (p_name != NULL) {
480 char *end_name;
481
482 p_name += sizeof("parentFileNameHint") + 1;
483 end_name = strchr(p_name, '\"');
484 if (end_name == NULL) {
485 ret = -EINVAL;
486 goto out;
487 }
488 if ((end_name - p_name) > sizeof(bs->auto_backing_file) - 1) {
489 ret = -EINVAL;
490 goto out;
491 }
492
493 pstrcpy(bs->auto_backing_file, end_name - p_name + 1, p_name);
494 pstrcpy(bs->backing_file, sizeof(bs->backing_file),
495 bs->auto_backing_file);
496 pstrcpy(bs->backing_format, sizeof(bs->backing_format),
497 "vmdk");
498 }
499
500 out:
501 g_free(desc);
502 return ret;
503 }
504
505 /* Create and append extent to the extent array. Return the added VmdkExtent
506 * address. return NULL if allocation failed. */
507 static int vmdk_add_extent(BlockDriverState *bs,
508 BdrvChild *file, bool flat, int64_t sectors,
509 int64_t l1_offset, int64_t l1_backup_offset,
510 uint32_t l1_size,
511 int l2_size, uint64_t cluster_sectors,
512 VmdkExtent **new_extent,
513 Error **errp)
514 {
515 VmdkExtent *extent;
516 BDRVVmdkState *s = bs->opaque;
517 int64_t nb_sectors;
518
519 if (cluster_sectors > 0x200000) {
520 /* 0x200000 * 512Bytes = 1GB for one cluster is unrealistic */
521 error_setg(errp, "Invalid granularity, image may be corrupt");
522 return -EFBIG;
523 }
524 if (l1_size > 32 * 1024 * 1024) {
525 /*
526 * Although with big capacity and small l1_entry_sectors, we can get a
527 * big l1_size, we don't want unbounded value to allocate the table.
528 * Limit it to 32M, which is enough to store:
529 * 8TB - for both VMDK3 & VMDK4 with
530 * minimal cluster size: 512B
531 * minimal L2 table size: 512 entries
532 * 8 TB is still more than the maximal value supported for
533 * VMDK3 & VMDK4 which is 2TB.
534 * 64TB - for "ESXi seSparse Extent"
535 * minimal cluster size: 512B (default is 4KB)
536 * L2 table size: 4096 entries (const).
537 * 64TB is more than the maximal value supported for
538 * seSparse VMDKs (which is slightly less than 64TB)
539 */
540 error_setg(errp, "L1 size too big");
541 return -EFBIG;
542 }
543
544 nb_sectors = bdrv_nb_sectors(file->bs);
545 if (nb_sectors < 0) {
546 return nb_sectors;
547 }
548
549 s->extents = g_renew(VmdkExtent, s->extents, s->num_extents + 1);
550 extent = &s->extents[s->num_extents];
551 s->num_extents++;
552
553 memset(extent, 0, sizeof(VmdkExtent));
554 extent->file = file;
555 extent->flat = flat;
556 extent->sectors = sectors;
557 extent->l1_table_offset = l1_offset;
558 extent->l1_backup_table_offset = l1_backup_offset;
559 extent->l1_size = l1_size;
560 extent->l1_entry_sectors = l2_size * cluster_sectors;
561 extent->l2_size = l2_size;
562 extent->cluster_sectors = flat ? sectors : cluster_sectors;
563 extent->next_cluster_sector = ROUND_UP(nb_sectors, cluster_sectors);
564 extent->entry_size = sizeof(uint32_t);
565
566 if (s->num_extents > 1) {
567 extent->end_sector = (*(extent - 1)).end_sector + extent->sectors;
568 } else {
569 extent->end_sector = extent->sectors;
570 }
571 bs->total_sectors = extent->end_sector;
572 if (new_extent) {
573 *new_extent = extent;
574 }
575 return 0;
576 }
577
578 static int vmdk_init_tables(BlockDriverState *bs, VmdkExtent *extent,
579 Error **errp)
580 {
581 int ret;
582 size_t l1_size;
583 int i;
584
585 /* read the L1 table */
586 l1_size = extent->l1_size * extent->entry_size;
587 extent->l1_table = g_try_malloc(l1_size);
588 if (l1_size && extent->l1_table == NULL) {
589 return -ENOMEM;
590 }
591
592 ret = bdrv_pread(extent->file,
593 extent->l1_table_offset,
594 extent->l1_table,
595 l1_size);
596 if (ret < 0) {
597 bdrv_refresh_filename(extent->file->bs);
598 error_setg_errno(errp, -ret,
599 "Could not read l1 table from extent '%s'",
600 extent->file->bs->filename);
601 goto fail_l1;
602 }
603 for (i = 0; i < extent->l1_size; i++) {
604 if (extent->entry_size == sizeof(uint64_t)) {
605 le64_to_cpus((uint64_t *)extent->l1_table + i);
606 } else {
607 assert(extent->entry_size == sizeof(uint32_t));
608 le32_to_cpus((uint32_t *)extent->l1_table + i);
609 }
610 }
611
612 if (extent->l1_backup_table_offset) {
613 assert(!extent->sesparse);
614 extent->l1_backup_table = g_try_malloc(l1_size);
615 if (l1_size && extent->l1_backup_table == NULL) {
616 ret = -ENOMEM;
617 goto fail_l1;
618 }
619 ret = bdrv_pread(extent->file,
620 extent->l1_backup_table_offset,
621 extent->l1_backup_table,
622 l1_size);
623 if (ret < 0) {
624 bdrv_refresh_filename(extent->file->bs);
625 error_setg_errno(errp, -ret,
626 "Could not read l1 backup table from extent '%s'",
627 extent->file->bs->filename);
628 goto fail_l1b;
629 }
630 for (i = 0; i < extent->l1_size; i++) {
631 le32_to_cpus(&extent->l1_backup_table[i]);
632 }
633 }
634
635 extent->l2_cache =
636 g_malloc(extent->entry_size * extent->l2_size * L2_CACHE_SIZE);
637 return 0;
638 fail_l1b:
639 g_free(extent->l1_backup_table);
640 fail_l1:
641 g_free(extent->l1_table);
642 return ret;
643 }
644
645 static int vmdk_open_vmfs_sparse(BlockDriverState *bs,
646 BdrvChild *file,
647 int flags, Error **errp)
648 {
649 int ret;
650 uint32_t magic;
651 VMDK3Header header;
652 VmdkExtent *extent = NULL;
653
654 ret = bdrv_pread(file, sizeof(magic), &header, sizeof(header));
655 if (ret < 0) {
656 bdrv_refresh_filename(file->bs);
657 error_setg_errno(errp, -ret,
658 "Could not read header from file '%s'",
659 file->bs->filename);
660 return ret;
661 }
662 ret = vmdk_add_extent(bs, file, false,
663 le32_to_cpu(header.disk_sectors),
664 (int64_t)le32_to_cpu(header.l1dir_offset) << 9,
665 0,
666 le32_to_cpu(header.l1dir_size),
667 4096,
668 le32_to_cpu(header.granularity),
669 &extent,
670 errp);
671 if (ret < 0) {
672 return ret;
673 }
674 ret = vmdk_init_tables(bs, extent, errp);
675 if (ret) {
676 /* free extent allocated by vmdk_add_extent */
677 vmdk_free_last_extent(bs);
678 }
679 return ret;
680 }
681
682 #define SESPARSE_CONST_HEADER_MAGIC UINT64_C(0x00000000cafebabe)
683 #define SESPARSE_VOLATILE_HEADER_MAGIC UINT64_C(0x00000000cafecafe)
684
685 /* Strict checks - format not officially documented */
686 static int check_se_sparse_const_header(VMDKSESparseConstHeader *header,
687 Error **errp)
688 {
689 header->magic = le64_to_cpu(header->magic);
690 header->version = le64_to_cpu(header->version);
691 header->grain_size = le64_to_cpu(header->grain_size);
692 header->grain_table_size = le64_to_cpu(header->grain_table_size);
693 header->flags = le64_to_cpu(header->flags);
694 header->reserved1 = le64_to_cpu(header->reserved1);
695 header->reserved2 = le64_to_cpu(header->reserved2);
696 header->reserved3 = le64_to_cpu(header->reserved3);
697 header->reserved4 = le64_to_cpu(header->reserved4);
698
699 header->volatile_header_offset =
700 le64_to_cpu(header->volatile_header_offset);
701 header->volatile_header_size = le64_to_cpu(header->volatile_header_size);
702
703 header->journal_header_offset = le64_to_cpu(header->journal_header_offset);
704 header->journal_header_size = le64_to_cpu(header->journal_header_size);
705
706 header->journal_offset = le64_to_cpu(header->journal_offset);
707 header->journal_size = le64_to_cpu(header->journal_size);
708
709 header->grain_dir_offset = le64_to_cpu(header->grain_dir_offset);
710 header->grain_dir_size = le64_to_cpu(header->grain_dir_size);
711
712 header->grain_tables_offset = le64_to_cpu(header->grain_tables_offset);
713 header->grain_tables_size = le64_to_cpu(header->grain_tables_size);
714
715 header->free_bitmap_offset = le64_to_cpu(header->free_bitmap_offset);
716 header->free_bitmap_size = le64_to_cpu(header->free_bitmap_size);
717
718 header->backmap_offset = le64_to_cpu(header->backmap_offset);
719 header->backmap_size = le64_to_cpu(header->backmap_size);
720
721 header->grains_offset = le64_to_cpu(header->grains_offset);
722 header->grains_size = le64_to_cpu(header->grains_size);
723
724 if (header->magic != SESPARSE_CONST_HEADER_MAGIC) {
725 error_setg(errp, "Bad const header magic: 0x%016" PRIx64,
726 header->magic);
727 return -EINVAL;
728 }
729
730 if (header->version != 0x0000000200000001) {
731 error_setg(errp, "Unsupported version: 0x%016" PRIx64,
732 header->version);
733 return -ENOTSUP;
734 }
735
736 if (header->grain_size != 8) {
737 error_setg(errp, "Unsupported grain size: %" PRIu64,
738 header->grain_size);
739 return -ENOTSUP;
740 }
741
742 if (header->grain_table_size != 64) {
743 error_setg(errp, "Unsupported grain table size: %" PRIu64,
744 header->grain_table_size);
745 return -ENOTSUP;
746 }
747
748 if (header->flags != 0) {
749 error_setg(errp, "Unsupported flags: 0x%016" PRIx64,
750 header->flags);
751 return -ENOTSUP;
752 }
753
754 if (header->reserved1 != 0 || header->reserved2 != 0 ||
755 header->reserved3 != 0 || header->reserved4 != 0) {
756 error_setg(errp, "Unsupported reserved bits:"
757 " 0x%016" PRIx64 " 0x%016" PRIx64
758 " 0x%016" PRIx64 " 0x%016" PRIx64,
759 header->reserved1, header->reserved2,
760 header->reserved3, header->reserved4);
761 return -ENOTSUP;
762 }
763
764 /* check that padding is 0 */
765 if (!buffer_is_zero(header->pad, sizeof(header->pad))) {
766 error_setg(errp, "Unsupported non-zero const header padding");
767 return -ENOTSUP;
768 }
769
770 return 0;
771 }
772
773 static int check_se_sparse_volatile_header(VMDKSESparseVolatileHeader *header,
774 Error **errp)
775 {
776 header->magic = le64_to_cpu(header->magic);
777 header->free_gt_number = le64_to_cpu(header->free_gt_number);
778 header->next_txn_seq_number = le64_to_cpu(header->next_txn_seq_number);
779 header->replay_journal = le64_to_cpu(header->replay_journal);
780
781 if (header->magic != SESPARSE_VOLATILE_HEADER_MAGIC) {
782 error_setg(errp, "Bad volatile header magic: 0x%016" PRIx64,
783 header->magic);
784 return -EINVAL;
785 }
786
787 if (header->replay_journal) {
788 error_setg(errp, "Image is dirty, Replaying journal not supported");
789 return -ENOTSUP;
790 }
791
792 /* check that padding is 0 */
793 if (!buffer_is_zero(header->pad, sizeof(header->pad))) {
794 error_setg(errp, "Unsupported non-zero volatile header padding");
795 return -ENOTSUP;
796 }
797
798 return 0;
799 }
800
801 static int vmdk_open_se_sparse(BlockDriverState *bs,
802 BdrvChild *file,
803 int flags, Error **errp)
804 {
805 int ret;
806 VMDKSESparseConstHeader const_header;
807 VMDKSESparseVolatileHeader volatile_header;
808 VmdkExtent *extent = NULL;
809
810 ret = bdrv_apply_auto_read_only(bs,
811 "No write support for seSparse images available", errp);
812 if (ret < 0) {
813 return ret;
814 }
815
816 assert(sizeof(const_header) == SECTOR_SIZE);
817
818 ret = bdrv_pread(file, 0, &const_header, sizeof(const_header));
819 if (ret < 0) {
820 bdrv_refresh_filename(file->bs);
821 error_setg_errno(errp, -ret,
822 "Could not read const header from file '%s'",
823 file->bs->filename);
824 return ret;
825 }
826
827 /* check const header */
828 ret = check_se_sparse_const_header(&const_header, errp);
829 if (ret < 0) {
830 return ret;
831 }
832
833 assert(sizeof(volatile_header) == SECTOR_SIZE);
834
835 ret = bdrv_pread(file,
836 const_header.volatile_header_offset * SECTOR_SIZE,
837 &volatile_header, sizeof(volatile_header));
838 if (ret < 0) {
839 bdrv_refresh_filename(file->bs);
840 error_setg_errno(errp, -ret,
841 "Could not read volatile header from file '%s'",
842 file->bs->filename);
843 return ret;
844 }
845
846 /* check volatile header */
847 ret = check_se_sparse_volatile_header(&volatile_header, errp);
848 if (ret < 0) {
849 return ret;
850 }
851
852 ret = vmdk_add_extent(bs, file, false,
853 const_header.capacity,
854 const_header.grain_dir_offset * SECTOR_SIZE,
855 0,
856 const_header.grain_dir_size *
857 SECTOR_SIZE / sizeof(uint64_t),
858 const_header.grain_table_size *
859 SECTOR_SIZE / sizeof(uint64_t),
860 const_header.grain_size,
861 &extent,
862 errp);
863 if (ret < 0) {
864 return ret;
865 }
866
867 extent->sesparse = true;
868 extent->sesparse_l2_tables_offset = const_header.grain_tables_offset;
869 extent->sesparse_clusters_offset = const_header.grains_offset;
870 extent->entry_size = sizeof(uint64_t);
871
872 ret = vmdk_init_tables(bs, extent, errp);
873 if (ret) {
874 /* free extent allocated by vmdk_add_extent */
875 vmdk_free_last_extent(bs);
876 }
877
878 return ret;
879 }
880
881 static int vmdk_open_desc_file(BlockDriverState *bs, int flags, char *buf,
882 QDict *options, Error **errp);
883
884 static char *vmdk_read_desc(BdrvChild *file, uint64_t desc_offset, Error **errp)
885 {
886 int64_t size;
887 char *buf;
888 int ret;
889
890 size = bdrv_getlength(file->bs);
891 if (size < 0) {
892 error_setg_errno(errp, -size, "Could not access file");
893 return NULL;
894 }
895
896 if (size < 4) {
897 /* Both descriptor file and sparse image must be much larger than 4
898 * bytes, also callers of vmdk_read_desc want to compare the first 4
899 * bytes with VMDK4_MAGIC, let's error out if less is read. */
900 error_setg(errp, "File is too small, not a valid image");
901 return NULL;
902 }
903
904 size = MIN(size, (1 << 20) - 1); /* avoid unbounded allocation */
905 buf = g_malloc(size + 1);
906
907 ret = bdrv_pread(file, desc_offset, buf, size);
908 if (ret < 0) {
909 error_setg_errno(errp, -ret, "Could not read from file");
910 g_free(buf);
911 return NULL;
912 }
913 buf[ret] = 0;
914
915 return buf;
916 }
917
918 static int vmdk_open_vmdk4(BlockDriverState *bs,
919 BdrvChild *file,
920 int flags, QDict *options, Error **errp)
921 {
922 int ret;
923 uint32_t magic;
924 uint32_t l1_size, l1_entry_sectors;
925 VMDK4Header header;
926 VmdkExtent *extent = NULL;
927 BDRVVmdkState *s = bs->opaque;
928 int64_t l1_backup_offset = 0;
929 bool compressed;
930
931 ret = bdrv_pread(file, sizeof(magic), &header, sizeof(header));
932 if (ret < 0) {
933 bdrv_refresh_filename(file->bs);
934 error_setg_errno(errp, -ret,
935 "Could not read header from file '%s'",
936 file->bs->filename);
937 return -EINVAL;
938 }
939 if (header.capacity == 0) {
940 uint64_t desc_offset = le64_to_cpu(header.desc_offset);
941 if (desc_offset) {
942 char *buf = vmdk_read_desc(file, desc_offset << 9, errp);
943 if (!buf) {
944 return -EINVAL;
945 }
946 ret = vmdk_open_desc_file(bs, flags, buf, options, errp);
947 g_free(buf);
948 return ret;
949 }
950 }
951
952 if (!s->create_type) {
953 s->create_type = g_strdup("monolithicSparse");
954 }
955
956 if (le64_to_cpu(header.gd_offset) == VMDK4_GD_AT_END) {
957 /*
958 * The footer takes precedence over the header, so read it in. The
959 * footer starts at offset -1024 from the end: One sector for the
960 * footer, and another one for the end-of-stream marker.
961 */
962 struct {
963 struct {
964 uint64_t val;
965 uint32_t size;
966 uint32_t type;
967 uint8_t pad[512 - 16];
968 } QEMU_PACKED footer_marker;
969
970 uint32_t magic;
971 VMDK4Header header;
972 uint8_t pad[512 - 4 - sizeof(VMDK4Header)];
973
974 struct {
975 uint64_t val;
976 uint32_t size;
977 uint32_t type;
978 uint8_t pad[512 - 16];
979 } QEMU_PACKED eos_marker;
980 } QEMU_PACKED footer;
981
982 ret = bdrv_pread(file,
983 bs->file->bs->total_sectors * 512 - 1536,
984 &footer, sizeof(footer));
985 if (ret < 0) {
986 error_setg_errno(errp, -ret, "Failed to read footer");
987 return ret;
988 }
989
990 /* Some sanity checks for the footer */
991 if (be32_to_cpu(footer.magic) != VMDK4_MAGIC ||
992 le32_to_cpu(footer.footer_marker.size) != 0 ||
993 le32_to_cpu(footer.footer_marker.type) != MARKER_FOOTER ||
994 le64_to_cpu(footer.eos_marker.val) != 0 ||
995 le32_to_cpu(footer.eos_marker.size) != 0 ||
996 le32_to_cpu(footer.eos_marker.type) != MARKER_END_OF_STREAM)
997 {
998 error_setg(errp, "Invalid footer");
999 return -EINVAL;
1000 }
1001
1002 header = footer.header;
1003 }
1004
1005 compressed =
1006 le16_to_cpu(header.compressAlgorithm) == VMDK4_COMPRESSION_DEFLATE;
1007 if (le32_to_cpu(header.version) > 3) {
1008 error_setg(errp, "Unsupported VMDK version %" PRIu32,
1009 le32_to_cpu(header.version));
1010 return -ENOTSUP;
1011 } else if (le32_to_cpu(header.version) == 3 && (flags & BDRV_O_RDWR) &&
1012 !compressed) {
1013 /* VMware KB 2064959 explains that version 3 added support for
1014 * persistent changed block tracking (CBT), and backup software can
1015 * read it as version=1 if it doesn't care about the changed area
1016 * information. So we are safe to enable read only. */
1017 error_setg(errp, "VMDK version 3 must be read only");
1018 return -EINVAL;
1019 }
1020
1021 if (le32_to_cpu(header.num_gtes_per_gt) > 512) {
1022 error_setg(errp, "L2 table size too big");
1023 return -EINVAL;
1024 }
1025
1026 l1_entry_sectors = le32_to_cpu(header.num_gtes_per_gt)
1027 * le64_to_cpu(header.granularity);
1028 if (l1_entry_sectors == 0) {
1029 error_setg(errp, "L1 entry size is invalid");
1030 return -EINVAL;
1031 }
1032 l1_size = (le64_to_cpu(header.capacity) + l1_entry_sectors - 1)
1033 / l1_entry_sectors;
1034 if (le32_to_cpu(header.flags) & VMDK4_FLAG_RGD) {
1035 l1_backup_offset = le64_to_cpu(header.rgd_offset) << 9;
1036 }
1037 if (bdrv_nb_sectors(file->bs) < le64_to_cpu(header.grain_offset)) {
1038 error_setg(errp, "File truncated, expecting at least %" PRId64 " bytes",
1039 (int64_t)(le64_to_cpu(header.grain_offset)
1040 * BDRV_SECTOR_SIZE));
1041 return -EINVAL;
1042 }
1043
1044 ret = vmdk_add_extent(bs, file, false,
1045 le64_to_cpu(header.capacity),
1046 le64_to_cpu(header.gd_offset) << 9,
1047 l1_backup_offset,
1048 l1_size,
1049 le32_to_cpu(header.num_gtes_per_gt),
1050 le64_to_cpu(header.granularity),
1051 &extent,
1052 errp);
1053 if (ret < 0) {
1054 return ret;
1055 }
1056 extent->compressed =
1057 le16_to_cpu(header.compressAlgorithm) == VMDK4_COMPRESSION_DEFLATE;
1058 if (extent->compressed) {
1059 g_free(s->create_type);
1060 s->create_type = g_strdup("streamOptimized");
1061 }
1062 extent->has_marker = le32_to_cpu(header.flags) & VMDK4_FLAG_MARKER;
1063 extent->version = le32_to_cpu(header.version);
1064 extent->has_zero_grain = le32_to_cpu(header.flags) & VMDK4_FLAG_ZERO_GRAIN;
1065 ret = vmdk_init_tables(bs, extent, errp);
1066 if (ret) {
1067 /* free extent allocated by vmdk_add_extent */
1068 vmdk_free_last_extent(bs);
1069 }
1070 return ret;
1071 }
1072
1073 /* find an option value out of descriptor file */
1074 static int vmdk_parse_description(const char *desc, const char *opt_name,
1075 char *buf, int buf_size)
1076 {
1077 char *opt_pos, *opt_end;
1078 const char *end = desc + strlen(desc);
1079
1080 opt_pos = strstr(desc, opt_name);
1081 if (!opt_pos) {
1082 return VMDK_ERROR;
1083 }
1084 /* Skip "=\"" following opt_name */
1085 opt_pos += strlen(opt_name) + 2;
1086 if (opt_pos >= end) {
1087 return VMDK_ERROR;
1088 }
1089 opt_end = opt_pos;
1090 while (opt_end < end && *opt_end != '"') {
1091 opt_end++;
1092 }
1093 if (opt_end == end || buf_size < opt_end - opt_pos + 1) {
1094 return VMDK_ERROR;
1095 }
1096 pstrcpy(buf, opt_end - opt_pos + 1, opt_pos);
1097 return VMDK_OK;
1098 }
1099
1100 /* Open an extent file and append to bs array */
1101 static int vmdk_open_sparse(BlockDriverState *bs, BdrvChild *file, int flags,
1102 char *buf, QDict *options, Error **errp)
1103 {
1104 uint32_t magic;
1105
1106 magic = ldl_be_p(buf);
1107 switch (magic) {
1108 case VMDK3_MAGIC:
1109 return vmdk_open_vmfs_sparse(bs, file, flags, errp);
1110 case VMDK4_MAGIC:
1111 return vmdk_open_vmdk4(bs, file, flags, options, errp);
1112 default:
1113 error_setg(errp, "Image not in VMDK format");
1114 return -EINVAL;
1115 }
1116 }
1117
1118 static const char *next_line(const char *s)
1119 {
1120 while (*s) {
1121 if (*s == '\n') {
1122 return s + 1;
1123 }
1124 s++;
1125 }
1126 return s;
1127 }
1128
1129 static int vmdk_parse_extents(const char *desc, BlockDriverState *bs,
1130 QDict *options, Error **errp)
1131 {
1132 int ret;
1133 int matches;
1134 char access[11];
1135 char type[11];
1136 char fname[512];
1137 const char *p, *np;
1138 int64_t sectors = 0;
1139 int64_t flat_offset;
1140 char *desc_file_dir = NULL;
1141 char *extent_path;
1142 BdrvChild *extent_file;
1143 BdrvChildRole extent_role;
1144 BDRVVmdkState *s = bs->opaque;
1145 VmdkExtent *extent = NULL;
1146 char extent_opt_prefix[32];
1147 Error *local_err = NULL;
1148
1149 for (p = desc; *p; p = next_line(p)) {
1150 /* parse extent line in one of below formats:
1151 *
1152 * RW [size in sectors] FLAT "file-name.vmdk" OFFSET
1153 * RW [size in sectors] SPARSE "file-name.vmdk"
1154 * RW [size in sectors] VMFS "file-name.vmdk"
1155 * RW [size in sectors] VMFSSPARSE "file-name.vmdk"
1156 * RW [size in sectors] SESPARSE "file-name.vmdk"
1157 */
1158 flat_offset = -1;
1159 matches = sscanf(p, "%10s %" SCNd64 " %10s \"%511[^\n\r\"]\" %" SCNd64,
1160 access, &sectors, type, fname, &flat_offset);
1161 if (matches < 4 || strcmp(access, "RW")) {
1162 continue;
1163 } else if (!strcmp(type, "FLAT")) {
1164 if (matches != 5 || flat_offset < 0) {
1165 goto invalid;
1166 }
1167 } else if (!strcmp(type, "VMFS")) {
1168 if (matches == 4) {
1169 flat_offset = 0;
1170 } else {
1171 goto invalid;
1172 }
1173 } else if (matches != 4) {
1174 goto invalid;
1175 }
1176
1177 if (sectors <= 0 ||
1178 (strcmp(type, "FLAT") && strcmp(type, "SPARSE") &&
1179 strcmp(type, "VMFS") && strcmp(type, "VMFSSPARSE") &&
1180 strcmp(type, "SESPARSE")) ||
1181 (strcmp(access, "RW"))) {
1182 continue;
1183 }
1184
1185 if (path_is_absolute(fname)) {
1186 extent_path = g_strdup(fname);
1187 } else {
1188 if (!desc_file_dir) {
1189 desc_file_dir = bdrv_dirname(bs->file->bs, errp);
1190 if (!desc_file_dir) {
1191 bdrv_refresh_filename(bs->file->bs);
1192 error_prepend(errp, "Cannot use relative paths with VMDK "
1193 "descriptor file '%s': ",
1194 bs->file->bs->filename);
1195 ret = -EINVAL;
1196 goto out;
1197 }
1198 }
1199
1200 extent_path = g_strconcat(desc_file_dir, fname, NULL);
1201 }
1202
1203 ret = snprintf(extent_opt_prefix, 32, "extents.%d", s->num_extents);
1204 assert(ret < 32);
1205
1206 extent_role = BDRV_CHILD_DATA;
1207 if (strcmp(type, "FLAT") != 0 && strcmp(type, "VMFS") != 0) {
1208 /* non-flat extents have metadata */
1209 extent_role |= BDRV_CHILD_METADATA;
1210 }
1211
1212 extent_file = bdrv_open_child(extent_path, options, extent_opt_prefix,
1213 bs, &child_of_bds, extent_role, false,
1214 &local_err);
1215 g_free(extent_path);
1216 if (local_err) {
1217 error_propagate(errp, local_err);
1218 ret = -EINVAL;
1219 goto out;
1220 }
1221
1222 /* save to extents array */
1223 if (!strcmp(type, "FLAT") || !strcmp(type, "VMFS")) {
1224 /* FLAT extent */
1225
1226 ret = vmdk_add_extent(bs, extent_file, true, sectors,
1227 0, 0, 0, 0, 0, &extent, errp);
1228 if (ret < 0) {
1229 bdrv_unref_child(bs, extent_file);
1230 goto out;
1231 }
1232 extent->flat_start_offset = flat_offset << 9;
1233 } else if (!strcmp(type, "SPARSE") || !strcmp(type, "VMFSSPARSE")) {
1234 /* SPARSE extent and VMFSSPARSE extent are both "COWD" sparse file*/
1235 char *buf = vmdk_read_desc(extent_file, 0, errp);
1236 if (!buf) {
1237 ret = -EINVAL;
1238 } else {
1239 ret = vmdk_open_sparse(bs, extent_file, bs->open_flags, buf,
1240 options, errp);
1241 }
1242 g_free(buf);
1243 if (ret) {
1244 bdrv_unref_child(bs, extent_file);
1245 goto out;
1246 }
1247 extent = &s->extents[s->num_extents - 1];
1248 } else if (!strcmp(type, "SESPARSE")) {
1249 ret = vmdk_open_se_sparse(bs, extent_file, bs->open_flags, errp);
1250 if (ret) {
1251 bdrv_unref_child(bs, extent_file);
1252 goto out;
1253 }
1254 extent = &s->extents[s->num_extents - 1];
1255 } else {
1256 error_setg(errp, "Unsupported extent type '%s'", type);
1257 bdrv_unref_child(bs, extent_file);
1258 ret = -ENOTSUP;
1259 goto out;
1260 }
1261 extent->type = g_strdup(type);
1262 }
1263
1264 ret = 0;
1265 goto out;
1266
1267 invalid:
1268 np = next_line(p);
1269 assert(np != p);
1270 if (np[-1] == '\n') {
1271 np--;
1272 }
1273 error_setg(errp, "Invalid extent line: %.*s", (int)(np - p), p);
1274 ret = -EINVAL;
1275
1276 out:
1277 g_free(desc_file_dir);
1278 return ret;
1279 }
1280
1281 static int vmdk_open_desc_file(BlockDriverState *bs, int flags, char *buf,
1282 QDict *options, Error **errp)
1283 {
1284 int ret;
1285 char ct[128];
1286 BDRVVmdkState *s = bs->opaque;
1287
1288 if (vmdk_parse_description(buf, "createType", ct, sizeof(ct))) {
1289 error_setg(errp, "invalid VMDK image descriptor");
1290 ret = -EINVAL;
1291 goto exit;
1292 }
1293 if (strcmp(ct, "monolithicFlat") &&
1294 strcmp(ct, "vmfs") &&
1295 strcmp(ct, "vmfsSparse") &&
1296 strcmp(ct, "seSparse") &&
1297 strcmp(ct, "twoGbMaxExtentSparse") &&
1298 strcmp(ct, "twoGbMaxExtentFlat")) {
1299 error_setg(errp, "Unsupported image type '%s'", ct);
1300 ret = -ENOTSUP;
1301 goto exit;
1302 }
1303 s->create_type = g_strdup(ct);
1304 s->desc_offset = 0;
1305 ret = vmdk_parse_extents(buf, bs, options, errp);
1306 exit:
1307 return ret;
1308 }
1309
1310 static int vmdk_open(BlockDriverState *bs, QDict *options, int flags,
1311 Error **errp)
1312 {
1313 char *buf;
1314 int ret;
1315 BDRVVmdkState *s = bs->opaque;
1316 uint32_t magic;
1317
1318 bs->file = bdrv_open_child(NULL, options, "file", bs, &child_of_bds,
1319 BDRV_CHILD_IMAGE, false, errp);
1320 if (!bs->file) {
1321 return -EINVAL;
1322 }
1323
1324 buf = vmdk_read_desc(bs->file, 0, errp);
1325 if (!buf) {
1326 return -EINVAL;
1327 }
1328
1329 magic = ldl_be_p(buf);
1330 switch (magic) {
1331 case VMDK3_MAGIC:
1332 case VMDK4_MAGIC:
1333 ret = vmdk_open_sparse(bs, bs->file, flags, buf, options,
1334 errp);
1335 s->desc_offset = 0x200;
1336 break;
1337 default:
1338 /* No data in the descriptor file */
1339 bs->file->role &= ~BDRV_CHILD_DATA;
1340
1341 /* Must succeed because we have given up permissions if anything */
1342 bdrv_child_refresh_perms(bs, bs->file, &error_abort);
1343
1344 ret = vmdk_open_desc_file(bs, flags, buf, options, errp);
1345 break;
1346 }
1347 if (ret) {
1348 goto fail;
1349 }
1350
1351 /* try to open parent images, if exist */
1352 ret = vmdk_parent_open(bs);
1353 if (ret) {
1354 goto fail;
1355 }
1356 ret = vmdk_read_cid(bs, 0, &s->cid);
1357 if (ret) {
1358 goto fail;
1359 }
1360 ret = vmdk_read_cid(bs, 1, &s->parent_cid);
1361 if (ret) {
1362 goto fail;
1363 }
1364 qemu_co_mutex_init(&s->lock);
1365
1366 /* Disable migration when VMDK images are used */
1367 error_setg(&s->migration_blocker, "The vmdk format used by node '%s' "
1368 "does not support live migration",
1369 bdrv_get_device_or_node_name(bs));
1370 ret = migrate_add_blocker(s->migration_blocker, errp);
1371 if (ret < 0) {
1372 error_free(s->migration_blocker);
1373 goto fail;
1374 }
1375
1376 g_free(buf);
1377 return 0;
1378
1379 fail:
1380 g_free(buf);
1381 g_free(s->create_type);
1382 s->create_type = NULL;
1383 vmdk_free_extents(bs);
1384 return ret;
1385 }
1386
1387
1388 static void vmdk_refresh_limits(BlockDriverState *bs, Error **errp)
1389 {
1390 BDRVVmdkState *s = bs->opaque;
1391 int i;
1392
1393 for (i = 0; i < s->num_extents; i++) {
1394 if (!s->extents[i].flat) {
1395 bs->bl.pwrite_zeroes_alignment =
1396 MAX(bs->bl.pwrite_zeroes_alignment,
1397 s->extents[i].cluster_sectors << BDRV_SECTOR_BITS);
1398 }
1399 }
1400 }
1401
1402 /**
1403 * get_whole_cluster
1404 *
1405 * Copy backing file's cluster that covers @sector_num, otherwise write zero,
1406 * to the cluster at @cluster_sector_num. If @zeroed is true, we're overwriting
1407 * a zeroed cluster in the current layer and must not copy data from the
1408 * backing file.
1409 *
1410 * If @skip_start_sector < @skip_end_sector, the relative range
1411 * [@skip_start_sector, @skip_end_sector) is not copied or written, and leave
1412 * it for call to write user data in the request.
1413 */
1414 static int get_whole_cluster(BlockDriverState *bs,
1415 VmdkExtent *extent,
1416 uint64_t cluster_offset,
1417 uint64_t offset,
1418 uint64_t skip_start_bytes,
1419 uint64_t skip_end_bytes,
1420 bool zeroed)
1421 {
1422 int ret = VMDK_OK;
1423 int64_t cluster_bytes;
1424 uint8_t *whole_grain;
1425 bool copy_from_backing;
1426
1427 /* For COW, align request sector_num to cluster start */
1428 cluster_bytes = extent->cluster_sectors << BDRV_SECTOR_BITS;
1429 offset = QEMU_ALIGN_DOWN(offset, cluster_bytes);
1430 whole_grain = qemu_blockalign(bs, cluster_bytes);
1431 copy_from_backing = bs->backing && !zeroed;
1432
1433 if (!copy_from_backing) {
1434 memset(whole_grain, 0, skip_start_bytes);
1435 memset(whole_grain + skip_end_bytes, 0, cluster_bytes - skip_end_bytes);
1436 }
1437
1438 assert(skip_end_bytes <= cluster_bytes);
1439 /* we will be here if it's first write on non-exist grain(cluster).
1440 * try to read from parent image, if exist */
1441 if (bs->backing && !vmdk_is_cid_valid(bs)) {
1442 ret = VMDK_ERROR;
1443 goto exit;
1444 }
1445
1446 /* Read backing data before skip range */
1447 if (skip_start_bytes > 0) {
1448 if (copy_from_backing) {
1449 /* qcow2 emits this on bs->file instead of bs->backing */
1450 BLKDBG_EVENT(extent->file, BLKDBG_COW_READ);
1451 ret = bdrv_pread(bs->backing, offset, whole_grain,
1452 skip_start_bytes);
1453 if (ret < 0) {
1454 ret = VMDK_ERROR;
1455 goto exit;
1456 }
1457 }
1458 BLKDBG_EVENT(extent->file, BLKDBG_COW_WRITE);
1459 ret = bdrv_pwrite(extent->file, cluster_offset, whole_grain,
1460 skip_start_bytes);
1461 if (ret < 0) {
1462 ret = VMDK_ERROR;
1463 goto exit;
1464 }
1465 }
1466 /* Read backing data after skip range */
1467 if (skip_end_bytes < cluster_bytes) {
1468 if (copy_from_backing) {
1469 /* qcow2 emits this on bs->file instead of bs->backing */
1470 BLKDBG_EVENT(extent->file, BLKDBG_COW_READ);
1471 ret = bdrv_pread(bs->backing, offset + skip_end_bytes,
1472 whole_grain + skip_end_bytes,
1473 cluster_bytes - skip_end_bytes);
1474 if (ret < 0) {
1475 ret = VMDK_ERROR;
1476 goto exit;
1477 }
1478 }
1479 BLKDBG_EVENT(extent->file, BLKDBG_COW_WRITE);
1480 ret = bdrv_pwrite(extent->file, cluster_offset + skip_end_bytes,
1481 whole_grain + skip_end_bytes,
1482 cluster_bytes - skip_end_bytes);
1483 if (ret < 0) {
1484 ret = VMDK_ERROR;
1485 goto exit;
1486 }
1487 }
1488
1489 ret = VMDK_OK;
1490 exit:
1491 qemu_vfree(whole_grain);
1492 return ret;
1493 }
1494
1495 static int vmdk_L2update(VmdkExtent *extent, VmdkMetaData *m_data,
1496 uint32_t offset)
1497 {
1498 offset = cpu_to_le32(offset);
1499 /* update L2 table */
1500 BLKDBG_EVENT(extent->file, BLKDBG_L2_UPDATE);
1501 if (bdrv_pwrite(extent->file,
1502 ((int64_t)m_data->l2_offset * 512)
1503 + (m_data->l2_index * sizeof(offset)),
1504 &offset, sizeof(offset)) < 0) {
1505 return VMDK_ERROR;
1506 }
1507 /* update backup L2 table */
1508 if (extent->l1_backup_table_offset != 0) {
1509 m_data->l2_offset = extent->l1_backup_table[m_data->l1_index];
1510 if (bdrv_pwrite(extent->file,
1511 ((int64_t)m_data->l2_offset * 512)
1512 + (m_data->l2_index * sizeof(offset)),
1513 &offset, sizeof(offset)) < 0) {
1514 return VMDK_ERROR;
1515 }
1516 }
1517 if (bdrv_flush(extent->file->bs) < 0) {
1518 return VMDK_ERROR;
1519 }
1520 if (m_data->l2_cache_entry) {
1521 *m_data->l2_cache_entry = offset;
1522 }
1523
1524 return VMDK_OK;
1525 }
1526
1527 /**
1528 * get_cluster_offset
1529 *
1530 * Look up cluster offset in extent file by sector number, and store in
1531 * @cluster_offset.
1532 *
1533 * For flat extents, the start offset as parsed from the description file is
1534 * returned.
1535 *
1536 * For sparse extents, look up in L1, L2 table. If allocate is true, return an
1537 * offset for a new cluster and update L2 cache. If there is a backing file,
1538 * COW is done before returning; otherwise, zeroes are written to the allocated
1539 * cluster. Both COW and zero writing skips the sector range
1540 * [@skip_start_sector, @skip_end_sector) passed in by caller, because caller
1541 * has new data to write there.
1542 *
1543 * Returns: VMDK_OK if cluster exists and mapped in the image.
1544 * VMDK_UNALLOC if cluster is not mapped and @allocate is false.
1545 * VMDK_ERROR if failed.
1546 */
1547 static int get_cluster_offset(BlockDriverState *bs,
1548 VmdkExtent *extent,
1549 VmdkMetaData *m_data,
1550 uint64_t offset,
1551 bool allocate,
1552 uint64_t *cluster_offset,
1553 uint64_t skip_start_bytes,
1554 uint64_t skip_end_bytes)
1555 {
1556 unsigned int l1_index, l2_offset, l2_index;
1557 int min_index, i, j;
1558 uint32_t min_count;
1559 void *l2_table;
1560 bool zeroed = false;
1561 int64_t ret;
1562 int64_t cluster_sector;
1563 unsigned int l2_size_bytes = extent->l2_size * extent->entry_size;
1564
1565 if (m_data) {
1566 m_data->new_allocation = false;
1567 }
1568 if (extent->flat) {
1569 *cluster_offset = extent->flat_start_offset;
1570 return VMDK_OK;
1571 }
1572
1573 offset -= (extent->end_sector - extent->sectors) * SECTOR_SIZE;
1574 l1_index = (offset >> 9) / extent->l1_entry_sectors;
1575 if (l1_index >= extent->l1_size) {
1576 return VMDK_ERROR;
1577 }
1578 if (extent->sesparse) {
1579 uint64_t l2_offset_u64;
1580
1581 assert(extent->entry_size == sizeof(uint64_t));
1582
1583 l2_offset_u64 = ((uint64_t *)extent->l1_table)[l1_index];
1584 if (l2_offset_u64 == 0) {
1585 l2_offset = 0;
1586 } else if ((l2_offset_u64 & 0xffffffff00000000) != 0x1000000000000000) {
1587 /*
1588 * Top most nibble is 0x1 if grain table is allocated.
1589 * strict check - top most 4 bytes must be 0x10000000 since max
1590 * supported size is 64TB for disk - so no more than 64TB / 16MB
1591 * grain directories which is smaller than uint32,
1592 * where 16MB is the only supported default grain table coverage.
1593 */
1594 return VMDK_ERROR;
1595 } else {
1596 l2_offset_u64 = l2_offset_u64 & 0x00000000ffffffff;
1597 l2_offset_u64 = extent->sesparse_l2_tables_offset +
1598 l2_offset_u64 * l2_size_bytes / SECTOR_SIZE;
1599 if (l2_offset_u64 > 0x00000000ffffffff) {
1600 return VMDK_ERROR;
1601 }
1602 l2_offset = (unsigned int)(l2_offset_u64);
1603 }
1604 } else {
1605 assert(extent->entry_size == sizeof(uint32_t));
1606 l2_offset = ((uint32_t *)extent->l1_table)[l1_index];
1607 }
1608 if (!l2_offset) {
1609 return VMDK_UNALLOC;
1610 }
1611 for (i = 0; i < L2_CACHE_SIZE; i++) {
1612 if (l2_offset == extent->l2_cache_offsets[i]) {
1613 /* increment the hit count */
1614 if (++extent->l2_cache_counts[i] == 0xffffffff) {
1615 for (j = 0; j < L2_CACHE_SIZE; j++) {
1616 extent->l2_cache_counts[j] >>= 1;
1617 }
1618 }
1619 l2_table = (char *)extent->l2_cache + (i * l2_size_bytes);
1620 goto found;
1621 }
1622 }
1623 /* not found: load a new entry in the least used one */
1624 min_index = 0;
1625 min_count = 0xffffffff;
1626 for (i = 0; i < L2_CACHE_SIZE; i++) {
1627 if (extent->l2_cache_counts[i] < min_count) {
1628 min_count = extent->l2_cache_counts[i];
1629 min_index = i;
1630 }
1631 }
1632 l2_table = (char *)extent->l2_cache + (min_index * l2_size_bytes);
1633 BLKDBG_EVENT(extent->file, BLKDBG_L2_LOAD);
1634 if (bdrv_pread(extent->file,
1635 (int64_t)l2_offset * 512,
1636 l2_table,
1637 l2_size_bytes
1638 ) != l2_size_bytes) {
1639 return VMDK_ERROR;
1640 }
1641
1642 extent->l2_cache_offsets[min_index] = l2_offset;
1643 extent->l2_cache_counts[min_index] = 1;
1644 found:
1645 l2_index = ((offset >> 9) / extent->cluster_sectors) % extent->l2_size;
1646 if (m_data) {
1647 m_data->l1_index = l1_index;
1648 m_data->l2_index = l2_index;
1649 m_data->l2_offset = l2_offset;
1650 m_data->l2_cache_entry = ((uint32_t *)l2_table) + l2_index;
1651 }
1652
1653 if (extent->sesparse) {
1654 cluster_sector = le64_to_cpu(((uint64_t *)l2_table)[l2_index]);
1655 switch (cluster_sector & 0xf000000000000000) {
1656 case 0x0000000000000000:
1657 /* unallocated grain */
1658 if (cluster_sector != 0) {
1659 return VMDK_ERROR;
1660 }
1661 break;
1662 case 0x1000000000000000:
1663 /* scsi-unmapped grain - fallthrough */
1664 case 0x2000000000000000:
1665 /* zero grain */
1666 zeroed = true;
1667 break;
1668 case 0x3000000000000000:
1669 /* allocated grain */
1670 cluster_sector = (((cluster_sector & 0x0fff000000000000) >> 48) |
1671 ((cluster_sector & 0x0000ffffffffffff) << 12));
1672 cluster_sector = extent->sesparse_clusters_offset +
1673 cluster_sector * extent->cluster_sectors;
1674 break;
1675 default:
1676 return VMDK_ERROR;
1677 }
1678 } else {
1679 cluster_sector = le32_to_cpu(((uint32_t *)l2_table)[l2_index]);
1680
1681 if (extent->has_zero_grain && cluster_sector == VMDK_GTE_ZEROED) {
1682 zeroed = true;
1683 }
1684 }
1685
1686 if (!cluster_sector || zeroed) {
1687 if (!allocate) {
1688 return zeroed ? VMDK_ZEROED : VMDK_UNALLOC;
1689 }
1690 assert(!extent->sesparse);
1691
1692 if (extent->next_cluster_sector >= VMDK_EXTENT_MAX_SECTORS) {
1693 return VMDK_ERROR;
1694 }
1695
1696 cluster_sector = extent->next_cluster_sector;
1697 extent->next_cluster_sector += extent->cluster_sectors;
1698
1699 /* First of all we write grain itself, to avoid race condition
1700 * that may to corrupt the image.
1701 * This problem may occur because of insufficient space on host disk
1702 * or inappropriate VM shutdown.
1703 */
1704 ret = get_whole_cluster(bs, extent, cluster_sector * BDRV_SECTOR_SIZE,
1705 offset, skip_start_bytes, skip_end_bytes,
1706 zeroed);
1707 if (ret) {
1708 return ret;
1709 }
1710 if (m_data) {
1711 m_data->new_allocation = true;
1712 }
1713 }
1714 *cluster_offset = cluster_sector << BDRV_SECTOR_BITS;
1715 return VMDK_OK;
1716 }
1717
1718 static VmdkExtent *find_extent(BDRVVmdkState *s,
1719 int64_t sector_num, VmdkExtent *start_hint)
1720 {
1721 VmdkExtent *extent = start_hint;
1722
1723 if (!extent) {
1724 extent = &s->extents[0];
1725 }
1726 while (extent < &s->extents[s->num_extents]) {
1727 if (sector_num < extent->end_sector) {
1728 return extent;
1729 }
1730 extent++;
1731 }
1732 return NULL;
1733 }
1734
1735 static inline uint64_t vmdk_find_offset_in_cluster(VmdkExtent *extent,
1736 int64_t offset)
1737 {
1738 uint64_t extent_begin_offset, extent_relative_offset;
1739 uint64_t cluster_size = extent->cluster_sectors * BDRV_SECTOR_SIZE;
1740
1741 extent_begin_offset =
1742 (extent->end_sector - extent->sectors) * BDRV_SECTOR_SIZE;
1743 extent_relative_offset = offset - extent_begin_offset;
1744 return extent_relative_offset % cluster_size;
1745 }
1746
1747 static int coroutine_fn vmdk_co_block_status(BlockDriverState *bs,
1748 bool want_zero,
1749 int64_t offset, int64_t bytes,
1750 int64_t *pnum, int64_t *map,
1751 BlockDriverState **file)
1752 {
1753 BDRVVmdkState *s = bs->opaque;
1754 int64_t index_in_cluster, n, ret;
1755 uint64_t cluster_offset;
1756 VmdkExtent *extent;
1757
1758 extent = find_extent(s, offset >> BDRV_SECTOR_BITS, NULL);
1759 if (!extent) {
1760 return -EIO;
1761 }
1762 qemu_co_mutex_lock(&s->lock);
1763 ret = get_cluster_offset(bs, extent, NULL, offset, false, &cluster_offset,
1764 0, 0);
1765 qemu_co_mutex_unlock(&s->lock);
1766
1767 index_in_cluster = vmdk_find_offset_in_cluster(extent, offset);
1768 switch (ret) {
1769 case VMDK_ERROR:
1770 ret = -EIO;
1771 break;
1772 case VMDK_UNALLOC:
1773 ret = 0;
1774 break;
1775 case VMDK_ZEROED:
1776 ret = BDRV_BLOCK_ZERO;
1777 break;
1778 case VMDK_OK:
1779 ret = BDRV_BLOCK_DATA;
1780 if (!extent->compressed) {
1781 ret |= BDRV_BLOCK_OFFSET_VALID;
1782 *map = cluster_offset + index_in_cluster;
1783 if (extent->flat) {
1784 ret |= BDRV_BLOCK_RECURSE;
1785 }
1786 }
1787 *file = extent->file->bs;
1788 break;
1789 }
1790
1791 n = extent->cluster_sectors * BDRV_SECTOR_SIZE - index_in_cluster;
1792 *pnum = MIN(n, bytes);
1793 return ret;
1794 }
1795
1796 static int vmdk_write_extent(VmdkExtent *extent, int64_t cluster_offset,
1797 int64_t offset_in_cluster, QEMUIOVector *qiov,
1798 uint64_t qiov_offset, uint64_t n_bytes,
1799 uint64_t offset)
1800 {
1801 int ret;
1802 VmdkGrainMarker *data = NULL;
1803 uLongf buf_len;
1804 QEMUIOVector local_qiov;
1805 int64_t write_offset;
1806 int64_t write_end_sector;
1807
1808 if (extent->compressed) {
1809 void *compressed_data;
1810
1811 /* Only whole clusters */
1812 if (offset_in_cluster ||
1813 n_bytes > (extent->cluster_sectors * SECTOR_SIZE) ||
1814 (n_bytes < (extent->cluster_sectors * SECTOR_SIZE) &&
1815 offset + n_bytes != extent->end_sector * SECTOR_SIZE))
1816 {
1817 ret = -EINVAL;
1818 goto out;
1819 }
1820
1821 if (!extent->has_marker) {
1822 ret = -EINVAL;
1823 goto out;
1824 }
1825 buf_len = (extent->cluster_sectors << 9) * 2;
1826 data = g_malloc(buf_len + sizeof(VmdkGrainMarker));
1827
1828 compressed_data = g_malloc(n_bytes);
1829 qemu_iovec_to_buf(qiov, qiov_offset, compressed_data, n_bytes);
1830 ret = compress(data->data, &buf_len, compressed_data, n_bytes);
1831 g_free(compressed_data);
1832
1833 if (ret != Z_OK || buf_len == 0) {
1834 ret = -EINVAL;
1835 goto out;
1836 }
1837
1838 data->lba = cpu_to_le64(offset >> BDRV_SECTOR_BITS);
1839 data->size = cpu_to_le32(buf_len);
1840
1841 n_bytes = buf_len + sizeof(VmdkGrainMarker);
1842 qemu_iovec_init_buf(&local_qiov, data, n_bytes);
1843
1844 BLKDBG_EVENT(extent->file, BLKDBG_WRITE_COMPRESSED);
1845 } else {
1846 qemu_iovec_init(&local_qiov, qiov->niov);
1847 qemu_iovec_concat(&local_qiov, qiov, qiov_offset, n_bytes);
1848
1849 BLKDBG_EVENT(extent->file, BLKDBG_WRITE_AIO);
1850 }
1851
1852 write_offset = cluster_offset + offset_in_cluster;
1853 ret = bdrv_co_pwritev(extent->file, write_offset, n_bytes,
1854 &local_qiov, 0);
1855
1856 write_end_sector = DIV_ROUND_UP(write_offset + n_bytes, BDRV_SECTOR_SIZE);
1857
1858 if (extent->compressed) {
1859 extent->next_cluster_sector = write_end_sector;
1860 } else {
1861 extent->next_cluster_sector = MAX(extent->next_cluster_sector,
1862 write_end_sector);
1863 }
1864
1865 if (ret < 0) {
1866 goto out;
1867 }
1868 ret = 0;
1869 out:
1870 g_free(data);
1871 if (!extent->compressed) {
1872 qemu_iovec_destroy(&local_qiov);
1873 }
1874 return ret;
1875 }
1876
1877 static int vmdk_read_extent(VmdkExtent *extent, int64_t cluster_offset,
1878 int64_t offset_in_cluster, QEMUIOVector *qiov,
1879 int bytes)
1880 {
1881 int ret;
1882 int cluster_bytes, buf_bytes;
1883 uint8_t *cluster_buf, *compressed_data;
1884 uint8_t *uncomp_buf;
1885 uint32_t data_len;
1886 VmdkGrainMarker *marker;
1887 uLongf buf_len;
1888
1889
1890 if (!extent->compressed) {
1891 BLKDBG_EVENT(extent->file, BLKDBG_READ_AIO);
1892 ret = bdrv_co_preadv(extent->file,
1893 cluster_offset + offset_in_cluster, bytes,
1894 qiov, 0);
1895 if (ret < 0) {
1896 return ret;
1897 }
1898 return 0;
1899 }
1900 cluster_bytes = extent->cluster_sectors * 512;
1901 /* Read two clusters in case GrainMarker + compressed data > one cluster */
1902 buf_bytes = cluster_bytes * 2;
1903 cluster_buf = g_malloc(buf_bytes);
1904 uncomp_buf = g_malloc(cluster_bytes);
1905 BLKDBG_EVENT(extent->file, BLKDBG_READ_COMPRESSED);
1906 ret = bdrv_pread(extent->file,
1907 cluster_offset,
1908 cluster_buf, buf_bytes);
1909 if (ret < 0) {
1910 goto out;
1911 }
1912 compressed_data = cluster_buf;
1913 buf_len = cluster_bytes;
1914 data_len = cluster_bytes;
1915 if (extent->has_marker) {
1916 marker = (VmdkGrainMarker *)cluster_buf;
1917 compressed_data = marker->data;
1918 data_len = le32_to_cpu(marker->size);
1919 }
1920 if (!data_len || data_len > buf_bytes) {
1921 ret = -EINVAL;
1922 goto out;
1923 }
1924 ret = uncompress(uncomp_buf, &buf_len, compressed_data, data_len);
1925 if (ret != Z_OK) {
1926 ret = -EINVAL;
1927 goto out;
1928
1929 }
1930 if (offset_in_cluster < 0 ||
1931 offset_in_cluster + bytes > buf_len) {
1932 ret = -EINVAL;
1933 goto out;
1934 }
1935 qemu_iovec_from_buf(qiov, 0, uncomp_buf + offset_in_cluster, bytes);
1936 ret = 0;
1937
1938 out:
1939 g_free(uncomp_buf);
1940 g_free(cluster_buf);
1941 return ret;
1942 }
1943
1944 static int coroutine_fn
1945 vmdk_co_preadv(BlockDriverState *bs, int64_t offset, int64_t bytes,
1946 QEMUIOVector *qiov, BdrvRequestFlags flags)
1947 {
1948 BDRVVmdkState *s = bs->opaque;
1949 int ret;
1950 uint64_t n_bytes, offset_in_cluster;
1951 VmdkExtent *extent = NULL;
1952 QEMUIOVector local_qiov;
1953 uint64_t cluster_offset;
1954 uint64_t bytes_done = 0;
1955
1956 qemu_iovec_init(&local_qiov, qiov->niov);
1957 qemu_co_mutex_lock(&s->lock);
1958
1959 while (bytes > 0) {
1960 extent = find_extent(s, offset >> BDRV_SECTOR_BITS, extent);
1961 if (!extent) {
1962 ret = -EIO;
1963 goto fail;
1964 }
1965 ret = get_cluster_offset(bs, extent, NULL,
1966 offset, false, &cluster_offset, 0, 0);
1967 offset_in_cluster = vmdk_find_offset_in_cluster(extent, offset);
1968
1969 n_bytes = MIN(bytes, extent->cluster_sectors * BDRV_SECTOR_SIZE
1970 - offset_in_cluster);
1971
1972 if (ret != VMDK_OK) {
1973 /* if not allocated, try to read from parent image, if exist */
1974 if (bs->backing && ret != VMDK_ZEROED) {
1975 if (!vmdk_is_cid_valid(bs)) {
1976 ret = -EINVAL;
1977 goto fail;
1978 }
1979
1980 qemu_iovec_reset(&local_qiov);
1981 qemu_iovec_concat(&local_qiov, qiov, bytes_done, n_bytes);
1982
1983 /* qcow2 emits this on bs->file instead of bs->backing */
1984 BLKDBG_EVENT(bs->file, BLKDBG_READ_BACKING_AIO);
1985 ret = bdrv_co_preadv(bs->backing, offset, n_bytes,
1986 &local_qiov, 0);
1987 if (ret < 0) {
1988 goto fail;
1989 }
1990 } else {
1991 qemu_iovec_memset(qiov, bytes_done, 0, n_bytes);
1992 }
1993 } else {
1994 qemu_iovec_reset(&local_qiov);
1995 qemu_iovec_concat(&local_qiov, qiov, bytes_done, n_bytes);
1996
1997 ret = vmdk_read_extent(extent, cluster_offset, offset_in_cluster,
1998 &local_qiov, n_bytes);
1999 if (ret) {
2000 goto fail;
2001 }
2002 }
2003 bytes -= n_bytes;
2004 offset += n_bytes;
2005 bytes_done += n_bytes;
2006 }
2007
2008 ret = 0;
2009 fail:
2010 qemu_co_mutex_unlock(&s->lock);
2011 qemu_iovec_destroy(&local_qiov);
2012
2013 return ret;
2014 }
2015
2016 /**
2017 * vmdk_write:
2018 * @zeroed: buf is ignored (data is zero), use zeroed_grain GTE feature
2019 * if possible, otherwise return -ENOTSUP.
2020 * @zero_dry_run: used for zeroed == true only, don't update L2 table, just try
2021 * with each cluster. By dry run we can find if the zero write
2022 * is possible without modifying image data.
2023 *
2024 * Returns: error code with 0 for success.
2025 */
2026 static int vmdk_pwritev(BlockDriverState *bs, uint64_t offset,
2027 uint64_t bytes, QEMUIOVector *qiov,
2028 bool zeroed, bool zero_dry_run)
2029 {
2030 BDRVVmdkState *s = bs->opaque;
2031 VmdkExtent *extent = NULL;
2032 int ret;
2033 int64_t offset_in_cluster, n_bytes;
2034 uint64_t cluster_offset;
2035 uint64_t bytes_done = 0;
2036 VmdkMetaData m_data;
2037
2038 if (DIV_ROUND_UP(offset, BDRV_SECTOR_SIZE) > bs->total_sectors) {
2039 error_report("Wrong offset: offset=0x%" PRIx64
2040 " total_sectors=0x%" PRIx64,
2041 offset, bs->total_sectors);
2042 return -EIO;
2043 }
2044
2045 while (bytes > 0) {
2046 extent = find_extent(s, offset >> BDRV_SECTOR_BITS, extent);
2047 if (!extent) {
2048 return -EIO;
2049 }
2050 if (extent->sesparse) {
2051 return -ENOTSUP;
2052 }
2053 offset_in_cluster = vmdk_find_offset_in_cluster(extent, offset);
2054 n_bytes = MIN(bytes, extent->cluster_sectors * BDRV_SECTOR_SIZE
2055 - offset_in_cluster);
2056
2057 ret = get_cluster_offset(bs, extent, &m_data, offset,
2058 !(extent->compressed || zeroed),
2059 &cluster_offset, offset_in_cluster,
2060 offset_in_cluster + n_bytes);
2061 if (extent->compressed) {
2062 if (ret == VMDK_OK) {
2063 /* Refuse write to allocated cluster for streamOptimized */
2064 error_report("Could not write to allocated cluster"
2065 " for streamOptimized");
2066 return -EIO;
2067 } else if (!zeroed) {
2068 /* allocate */
2069 ret = get_cluster_offset(bs, extent, &m_data, offset,
2070 true, &cluster_offset, 0, 0);
2071 }
2072 }
2073 if (ret == VMDK_ERROR) {
2074 return -EINVAL;
2075 }
2076 if (zeroed) {
2077 /* Do zeroed write, buf is ignored */
2078 if (extent->has_zero_grain &&
2079 offset_in_cluster == 0 &&
2080 n_bytes >= extent->cluster_sectors * BDRV_SECTOR_SIZE) {
2081 n_bytes = extent->cluster_sectors * BDRV_SECTOR_SIZE;
2082 if (!zero_dry_run && ret != VMDK_ZEROED) {
2083 /* update L2 tables */
2084 if (vmdk_L2update(extent, &m_data, VMDK_GTE_ZEROED)
2085 != VMDK_OK) {
2086 return -EIO;
2087 }
2088 }
2089 } else {
2090 return -ENOTSUP;
2091 }
2092 } else {
2093 ret = vmdk_write_extent(extent, cluster_offset, offset_in_cluster,
2094 qiov, bytes_done, n_bytes, offset);
2095 if (ret) {
2096 return ret;
2097 }
2098 if (m_data.new_allocation) {
2099 /* update L2 tables */
2100 if (vmdk_L2update(extent, &m_data,
2101 cluster_offset >> BDRV_SECTOR_BITS)
2102 != VMDK_OK) {
2103 return -EIO;
2104 }
2105 }
2106 }
2107 bytes -= n_bytes;
2108 offset += n_bytes;
2109 bytes_done += n_bytes;
2110
2111 /* update CID on the first write every time the virtual disk is
2112 * opened */
2113 if (!s->cid_updated) {
2114 ret = vmdk_write_cid(bs, g_random_int());
2115 if (ret < 0) {
2116 return ret;
2117 }
2118 s->cid_updated = true;
2119 }
2120 }
2121 return 0;
2122 }
2123
2124 static int coroutine_fn
2125 vmdk_co_pwritev(BlockDriverState *bs, int64_t offset, int64_t bytes,
2126 QEMUIOVector *qiov, BdrvRequestFlags flags)
2127 {
2128 int ret;
2129 BDRVVmdkState *s = bs->opaque;
2130 qemu_co_mutex_lock(&s->lock);
2131 ret = vmdk_pwritev(bs, offset, bytes, qiov, false, false);
2132 qemu_co_mutex_unlock(&s->lock);
2133 return ret;
2134 }
2135
2136 static int coroutine_fn
2137 vmdk_co_pwritev_compressed(BlockDriverState *bs, int64_t offset, int64_t bytes,
2138 QEMUIOVector *qiov)
2139 {
2140 if (bytes == 0) {
2141 /* The caller will write bytes 0 to signal EOF.
2142 * When receive it, we align EOF to a sector boundary. */
2143 BDRVVmdkState *s = bs->opaque;
2144 int i, ret;
2145 int64_t length;
2146
2147 for (i = 0; i < s->num_extents; i++) {
2148 length = bdrv_getlength(s->extents[i].file->bs);
2149 if (length < 0) {
2150 return length;
2151 }
2152 length = QEMU_ALIGN_UP(length, BDRV_SECTOR_SIZE);
2153 ret = bdrv_truncate(s->extents[i].file, length, false,
2154 PREALLOC_MODE_OFF, 0, NULL);
2155 if (ret < 0) {
2156 return ret;
2157 }
2158 }
2159 return 0;
2160 }
2161 return vmdk_co_pwritev(bs, offset, bytes, qiov, 0);
2162 }
2163
2164 static int coroutine_fn vmdk_co_pwrite_zeroes(BlockDriverState *bs,
2165 int64_t offset,
2166 int64_t bytes,
2167 BdrvRequestFlags flags)
2168 {
2169 int ret;
2170 BDRVVmdkState *s = bs->opaque;
2171
2172 qemu_co_mutex_lock(&s->lock);
2173 /* write zeroes could fail if sectors not aligned to cluster, test it with
2174 * dry_run == true before really updating image */
2175 ret = vmdk_pwritev(bs, offset, bytes, NULL, true, true);
2176 if (!ret) {
2177 ret = vmdk_pwritev(bs, offset, bytes, NULL, true, false);
2178 }
2179 qemu_co_mutex_unlock(&s->lock);
2180 return ret;
2181 }
2182
2183 static int vmdk_init_extent(BlockBackend *blk,
2184 int64_t filesize, bool flat,
2185 bool compress, bool zeroed_grain,
2186 Error **errp)
2187 {
2188 int ret, i;
2189 VMDK4Header header;
2190 uint32_t tmp, magic, grains, gd_sectors, gt_size, gt_count;
2191 uint32_t *gd_buf = NULL;
2192 int gd_buf_size;
2193
2194 if (flat) {
2195 ret = blk_truncate(blk, filesize, false, PREALLOC_MODE_OFF, 0, errp);
2196 goto exit;
2197 }
2198 magic = cpu_to_be32(VMDK4_MAGIC);
2199 memset(&header, 0, sizeof(header));
2200 if (compress) {
2201 header.version = 3;
2202 } else if (zeroed_grain) {
2203 header.version = 2;
2204 } else {
2205 header.version = 1;
2206 }
2207 header.flags = VMDK4_FLAG_RGD | VMDK4_FLAG_NL_DETECT
2208 | (compress ? VMDK4_FLAG_COMPRESS | VMDK4_FLAG_MARKER : 0)
2209 | (zeroed_grain ? VMDK4_FLAG_ZERO_GRAIN : 0);
2210 header.compressAlgorithm = compress ? VMDK4_COMPRESSION_DEFLATE : 0;
2211 header.capacity = filesize / BDRV_SECTOR_SIZE;
2212 header.granularity = 128;
2213 header.num_gtes_per_gt = BDRV_SECTOR_SIZE;
2214
2215 grains = DIV_ROUND_UP(filesize / BDRV_SECTOR_SIZE, header.granularity);
2216 gt_size = DIV_ROUND_UP(header.num_gtes_per_gt * sizeof(uint32_t),
2217 BDRV_SECTOR_SIZE);
2218 gt_count = DIV_ROUND_UP(grains, header.num_gtes_per_gt);
2219 gd_sectors = DIV_ROUND_UP(gt_count * sizeof(uint32_t), BDRV_SECTOR_SIZE);
2220
2221 header.desc_offset = 1;
2222 header.desc_size = 20;
2223 header.rgd_offset = header.desc_offset + header.desc_size;
2224 header.gd_offset = header.rgd_offset + gd_sectors + (gt_size * gt_count);
2225 header.grain_offset =
2226 ROUND_UP(header.gd_offset + gd_sectors + (gt_size * gt_count),
2227 header.granularity);
2228 /* swap endianness for all header fields */
2229 header.version = cpu_to_le32(header.version);
2230 header.flags = cpu_to_le32(header.flags);
2231 header.capacity = cpu_to_le64(header.capacity);
2232 header.granularity = cpu_to_le64(header.granularity);
2233 header.num_gtes_per_gt = cpu_to_le32(header.num_gtes_per_gt);
2234 header.desc_offset = cpu_to_le64(header.desc_offset);
2235 header.desc_size = cpu_to_le64(header.desc_size);
2236 header.rgd_offset = cpu_to_le64(header.rgd_offset);
2237 header.gd_offset = cpu_to_le64(header.gd_offset);
2238 header.grain_offset = cpu_to_le64(header.grain_offset);
2239 header.compressAlgorithm = cpu_to_le16(header.compressAlgorithm);
2240
2241 header.check_bytes[0] = 0xa;
2242 header.check_bytes[1] = 0x20;
2243 header.check_bytes[2] = 0xd;
2244 header.check_bytes[3] = 0xa;
2245
2246 /* write all the data */
2247 ret = blk_pwrite(blk, 0, &magic, sizeof(magic), 0);
2248 if (ret < 0) {
2249 error_setg(errp, QERR_IO_ERROR);
2250 goto exit;
2251 }
2252 ret = blk_pwrite(blk, sizeof(magic), &header, sizeof(header), 0);
2253 if (ret < 0) {
2254 error_setg(errp, QERR_IO_ERROR);
2255 goto exit;
2256 }
2257
2258 ret = blk_truncate(blk, le64_to_cpu(header.grain_offset) << 9, false,
2259 PREALLOC_MODE_OFF, 0, errp);
2260 if (ret < 0) {
2261 goto exit;
2262 }
2263
2264 /* write grain directory */
2265 gd_buf_size = gd_sectors * BDRV_SECTOR_SIZE;
2266 gd_buf = g_malloc0(gd_buf_size);
2267 for (i = 0, tmp = le64_to_cpu(header.rgd_offset) + gd_sectors;
2268 i < gt_count; i++, tmp += gt_size) {
2269 gd_buf[i] = cpu_to_le32(tmp);
2270 }
2271 ret = blk_pwrite(blk, le64_to_cpu(header.rgd_offset) * BDRV_SECTOR_SIZE,
2272 gd_buf, gd_buf_size, 0);
2273 if (ret < 0) {
2274 error_setg(errp, QERR_IO_ERROR);
2275 goto exit;
2276 }
2277
2278 /* write backup grain directory */
2279 for (i = 0, tmp = le64_to_cpu(header.gd_offset) + gd_sectors;
2280 i < gt_count; i++, tmp += gt_size) {
2281 gd_buf[i] = cpu_to_le32(tmp);
2282 }
2283 ret = blk_pwrite(blk, le64_to_cpu(header.gd_offset) * BDRV_SECTOR_SIZE,
2284 gd_buf, gd_buf_size, 0);
2285 if (ret < 0) {
2286 error_setg(errp, QERR_IO_ERROR);
2287 }
2288
2289 ret = 0;
2290 exit:
2291 g_free(gd_buf);
2292 return ret;
2293 }
2294
2295 static int vmdk_create_extent(const char *filename, int64_t filesize,
2296 bool flat, bool compress, bool zeroed_grain,
2297 BlockBackend **pbb,
2298 QemuOpts *opts, Error **errp)
2299 {
2300 int ret;
2301 BlockBackend *blk = NULL;
2302
2303 ret = bdrv_create_file(filename, opts, errp);
2304 if (ret < 0) {
2305 goto exit;
2306 }
2307
2308 blk = blk_new_open(filename, NULL, NULL,
2309 BDRV_O_RDWR | BDRV_O_RESIZE | BDRV_O_PROTOCOL,
2310 errp);
2311 if (blk == NULL) {
2312 ret = -EIO;
2313 goto exit;
2314 }
2315
2316 blk_set_allow_write_beyond_eof(blk, true);
2317
2318 ret = vmdk_init_extent(blk, filesize, flat, compress, zeroed_grain, errp);
2319 exit:
2320 if (blk) {
2321 if (pbb) {
2322 *pbb = blk;
2323 } else {
2324 blk_unref(blk);
2325 blk = NULL;
2326 }
2327 }
2328 return ret;
2329 }
2330
2331 static int filename_decompose(const char *filename, char *path, char *prefix,
2332 char *postfix, size_t buf_len, Error **errp)
2333 {
2334 const char *p, *q;
2335
2336 if (filename == NULL || !strlen(filename)) {
2337 error_setg(errp, "No filename provided");
2338 return VMDK_ERROR;
2339 }
2340 p = strrchr(filename, '/');
2341 if (p == NULL) {
2342 p = strrchr(filename, '\\');
2343 }
2344 if (p == NULL) {
2345 p = strrchr(filename, ':');
2346 }
2347 if (p != NULL) {
2348 p++;
2349 if (p - filename >= buf_len) {
2350 return VMDK_ERROR;
2351 }
2352 pstrcpy(path, p - filename + 1, filename);
2353 } else {
2354 p = filename;
2355 path[0] = '\0';
2356 }
2357 q = strrchr(p, '.');
2358 if (q == NULL) {
2359 pstrcpy(prefix, buf_len, p);
2360 postfix[0] = '\0';
2361 } else {
2362 if (q - p >= buf_len) {
2363 return VMDK_ERROR;
2364 }
2365 pstrcpy(prefix, q - p + 1, p);
2366 pstrcpy(postfix, buf_len, q);
2367 }
2368 return VMDK_OK;
2369 }
2370
2371 /*
2372 * idx == 0: get or create the descriptor file (also the image file if in a
2373 * non-split format.
2374 * idx >= 1: get the n-th extent if in a split subformat
2375 */
2376 typedef BlockBackend *(*vmdk_create_extent_fn)(int64_t size,
2377 int idx,
2378 bool flat,
2379 bool split,
2380 bool compress,
2381 bool zeroed_grain,
2382 void *opaque,
2383 Error **errp);
2384
2385 static void vmdk_desc_add_extent(GString *desc,
2386 const char *extent_line_fmt,
2387 int64_t size, const char *filename)
2388 {
2389 char *basename = g_path_get_basename(filename);
2390
2391 g_string_append_printf(desc, extent_line_fmt,
2392 DIV_ROUND_UP(size, BDRV_SECTOR_SIZE), basename);
2393 g_free(basename);
2394 }
2395
2396 static int coroutine_fn vmdk_co_do_create(int64_t size,
2397 BlockdevVmdkSubformat subformat,
2398 BlockdevVmdkAdapterType adapter_type,
2399 const char *backing_file,
2400 const char *hw_version,
2401 const char *toolsversion,
2402 bool compat6,
2403 bool zeroed_grain,
2404 vmdk_create_extent_fn extent_fn,
2405 void *opaque,
2406 Error **errp)
2407 {
2408 int extent_idx;
2409 BlockBackend *blk = NULL;
2410 BlockBackend *extent_blk;
2411 Error *local_err = NULL;
2412 char *desc = NULL;
2413 int ret = 0;
2414 bool flat, split, compress;
2415 GString *ext_desc_lines;
2416 const int64_t split_size = 0x80000000; /* VMDK has constant split size */
2417 int64_t extent_size;
2418 int64_t created_size = 0;
2419 const char *extent_line_fmt;
2420 char *parent_desc_line = g_malloc0(BUF_SIZE);
2421 uint32_t parent_cid = 0xffffffff;
2422 uint32_t number_heads = 16;
2423 uint32_t desc_offset = 0, desc_len;
2424 const char desc_template[] =
2425 "# Disk DescriptorFile\n"
2426 "version=1\n"
2427 "CID=%" PRIx32 "\n"
2428 "parentCID=%" PRIx32 "\n"
2429 "createType=\"%s\"\n"
2430 "%s"
2431 "\n"
2432 "# Extent description\n"
2433 "%s"
2434 "\n"
2435 "# The Disk Data Base\n"
2436 "#DDB\n"
2437 "\n"
2438 "ddb.virtualHWVersion = \"%s\"\n"
2439 "ddb.geometry.cylinders = \"%" PRId64 "\"\n"
2440 "ddb.geometry.heads = \"%" PRIu32 "\"\n"
2441 "ddb.geometry.sectors = \"63\"\n"
2442 "ddb.adapterType = \"%s\"\n"
2443 "ddb.toolsVersion = \"%s\"\n";
2444
2445 ext_desc_lines = g_string_new(NULL);
2446
2447 /* Read out options */
2448 if (compat6) {
2449 if (hw_version) {
2450 error_setg(errp,
2451 "compat6 cannot be enabled with hwversion set");
2452 ret = -EINVAL;
2453 goto exit;
2454 }
2455 hw_version = "6";
2456 }
2457 if (!hw_version) {
2458 hw_version = "4";
2459 }
2460 if (!toolsversion) {
2461 toolsversion = "2147483647";
2462 }
2463
2464 if (adapter_type != BLOCKDEV_VMDK_ADAPTER_TYPE_IDE) {
2465 /* that's the number of heads with which vmware operates when
2466 creating, exporting, etc. vmdk files with a non-ide adapter type */
2467 number_heads = 255;
2468 }
2469 split = (subformat == BLOCKDEV_VMDK_SUBFORMAT_TWOGBMAXEXTENTFLAT) ||
2470 (subformat == BLOCKDEV_VMDK_SUBFORMAT_TWOGBMAXEXTENTSPARSE);
2471 flat = (subformat == BLOCKDEV_VMDK_SUBFORMAT_MONOLITHICFLAT) ||
2472 (subformat == BLOCKDEV_VMDK_SUBFORMAT_TWOGBMAXEXTENTFLAT);
2473 compress = subformat == BLOCKDEV_VMDK_SUBFORMAT_STREAMOPTIMIZED;
2474
2475 if (flat) {
2476 extent_line_fmt = "RW %" PRId64 " FLAT \"%s\" 0\n";
2477 } else {
2478 extent_line_fmt = "RW %" PRId64 " SPARSE \"%s\"\n";
2479 }
2480 if (flat && backing_file) {
2481 error_setg(errp, "Flat image can't have backing file");
2482 ret = -ENOTSUP;
2483 goto exit;
2484 }
2485 if (flat && zeroed_grain) {
2486 error_setg(errp, "Flat image can't enable zeroed grain");
2487 ret = -ENOTSUP;
2488 goto exit;
2489 }
2490
2491 /* Create extents */
2492 if (split) {
2493 extent_size = split_size;
2494 } else {
2495 extent_size = size;
2496 }
2497 if (!split && !flat) {
2498 created_size = extent_size;
2499 } else {
2500 created_size = 0;
2501 }
2502 /* Get the descriptor file BDS */
2503 blk = extent_fn(created_size, 0, flat, split, compress, zeroed_grain,
2504 opaque, errp);
2505 if (!blk) {
2506 ret = -EIO;
2507 goto exit;
2508 }
2509 if (!split && !flat) {
2510 vmdk_desc_add_extent(ext_desc_lines, extent_line_fmt, created_size,
2511 blk_bs(blk)->filename);
2512 }
2513
2514 if (backing_file) {
2515 BlockBackend *backing;
2516 char *full_backing =
2517 bdrv_get_full_backing_filename_from_filename(blk_bs(blk)->filename,
2518 backing_file,
2519 &local_err);
2520 if (local_err) {
2521 error_propagate(errp, local_err);
2522 ret = -ENOENT;
2523 goto exit;
2524 }
2525 assert(full_backing);
2526
2527 backing = blk_new_open(full_backing, NULL, NULL,
2528 BDRV_O_NO_BACKING, errp);
2529 g_free(full_backing);
2530 if (backing == NULL) {
2531 ret = -EIO;
2532 goto exit;
2533 }
2534 if (strcmp(blk_bs(backing)->drv->format_name, "vmdk")) {
2535 error_setg(errp, "Invalid backing file format: %s. Must be vmdk",
2536 blk_bs(backing)->drv->format_name);
2537 blk_unref(backing);
2538 ret = -EINVAL;
2539 goto exit;
2540 }
2541 ret = vmdk_read_cid(blk_bs(backing), 0, &parent_cid);
2542 blk_unref(backing);
2543 if (ret) {
2544 error_setg(errp, "Failed to read parent CID");
2545 goto exit;
2546 }
2547 snprintf(parent_desc_line, BUF_SIZE,
2548 "parentFileNameHint=\"%s\"", backing_file);
2549 }
2550 extent_idx = 1;
2551 while (created_size < size) {
2552 int64_t cur_size = MIN(size - created_size, extent_size);
2553 extent_blk = extent_fn(cur_size, extent_idx, flat, split, compress,
2554 zeroed_grain, opaque, errp);
2555 if (!extent_blk) {
2556 ret = -EINVAL;
2557 goto exit;
2558 }
2559 vmdk_desc_add_extent(ext_desc_lines, extent_line_fmt, cur_size,
2560 blk_bs(extent_blk)->filename);
2561 created_size += cur_size;
2562 extent_idx++;
2563 blk_unref(extent_blk);
2564 }
2565
2566 /* Check whether we got excess extents */
2567 extent_blk = extent_fn(-1, extent_idx, flat, split, compress, zeroed_grain,
2568 opaque, NULL);
2569 if (extent_blk) {
2570 blk_unref(extent_blk);
2571 error_setg(errp, "List of extents contains unused extents");
2572 ret = -EINVAL;
2573 goto exit;
2574 }
2575
2576 /* generate descriptor file */
2577 desc = g_strdup_printf(desc_template,
2578 g_random_int(),
2579 parent_cid,
2580 BlockdevVmdkSubformat_str(subformat),
2581 parent_desc_line,
2582 ext_desc_lines->str,
2583 hw_version,
2584 size /
2585 (int64_t)(63 * number_heads * BDRV_SECTOR_SIZE),
2586 number_heads,
2587 BlockdevVmdkAdapterType_str(adapter_type),
2588 toolsversion);
2589 desc_len = strlen(desc);
2590 /* the descriptor offset = 0x200 */
2591 if (!split && !flat) {
2592 desc_offset = 0x200;
2593 }
2594
2595 ret = blk_pwrite(blk, desc_offset, desc, desc_len, 0);
2596 if (ret < 0) {
2597 error_setg_errno(errp, -ret, "Could not write description");
2598 goto exit;
2599 }
2600 /* bdrv_pwrite write padding zeros to align to sector, we don't need that
2601 * for description file */
2602 if (desc_offset == 0) {
2603 ret = blk_truncate(blk, desc_len, false, PREALLOC_MODE_OFF, 0, errp);
2604 if (ret < 0) {
2605 goto exit;
2606 }
2607 }
2608 ret = 0;
2609 exit:
2610 if (blk) {
2611 blk_unref(blk);
2612 }
2613 g_free(desc);
2614 g_free(parent_desc_line);
2615 g_string_free(ext_desc_lines, true);
2616 return ret;
2617 }
2618
2619 typedef struct {
2620 char *path;
2621 char *prefix;
2622 char *postfix;
2623 QemuOpts *opts;
2624 } VMDKCreateOptsData;
2625
2626 static BlockBackend *vmdk_co_create_opts_cb(int64_t size, int idx,
2627 bool flat, bool split, bool compress,
2628 bool zeroed_grain, void *opaque,
2629 Error **errp)
2630 {
2631 BlockBackend *blk = NULL;
2632 BlockDriverState *bs = NULL;
2633 VMDKCreateOptsData *data = opaque;
2634 char *ext_filename = NULL;
2635 char *rel_filename = NULL;
2636
2637 /* We're done, don't create excess extents. */
2638 if (size == -1) {
2639 assert(errp == NULL);
2640 return NULL;
2641 }
2642
2643 if (idx == 0) {
2644 rel_filename = g_strdup_printf("%s%s", data->prefix, data->postfix);
2645 } else if (split) {
2646 rel_filename = g_strdup_printf("%s-%c%03d%s",
2647 data->prefix,
2648 flat ? 'f' : 's', idx, data->postfix);
2649 } else {
2650 assert(idx == 1);
2651 rel_filename = g_strdup_printf("%s-flat%s", data->prefix, data->postfix);
2652 }
2653
2654 ext_filename = g_strdup_printf("%s%s", data->path, rel_filename);
2655 g_free(rel_filename);
2656
2657 if (vmdk_create_extent(ext_filename, size,
2658 flat, compress, zeroed_grain, &blk, data->opts,
2659 errp)) {
2660 goto exit;
2661 }
2662 bdrv_unref(bs);
2663 exit:
2664 g_free(ext_filename);
2665 return blk;
2666 }
2667
2668 static int coroutine_fn vmdk_co_create_opts(BlockDriver *drv,
2669 const char *filename,
2670 QemuOpts *opts,
2671 Error **errp)
2672 {
2673 Error *local_err = NULL;
2674 char *desc = NULL;
2675 int64_t total_size = 0;
2676 char *adapter_type = NULL;
2677 BlockdevVmdkAdapterType adapter_type_enum;
2678 char *backing_file = NULL;
2679 char *hw_version = NULL;
2680 char *toolsversion = NULL;
2681 char *fmt = NULL;
2682 BlockdevVmdkSubformat subformat;
2683 int ret = 0;
2684 char *path = g_malloc0(PATH_MAX);
2685 char *prefix = g_malloc0(PATH_MAX);
2686 char *postfix = g_malloc0(PATH_MAX);
2687 char *desc_line = g_malloc0(BUF_SIZE);
2688 char *ext_filename = g_malloc0(PATH_MAX);
2689 char *desc_filename = g_malloc0(PATH_MAX);
2690 char *parent_desc_line = g_malloc0(BUF_SIZE);
2691 bool zeroed_grain;
2692 bool compat6;
2693 VMDKCreateOptsData data;
2694 char *backing_fmt = NULL;
2695
2696 backing_fmt = qemu_opt_get_del(opts, BLOCK_OPT_BACKING_FMT);
2697 if (backing_fmt && strcmp(backing_fmt, "vmdk") != 0) {
2698 error_setg(errp, "backing_file must be a vmdk image");
2699 ret = -EINVAL;
2700 goto exit;
2701 }
2702
2703 if (filename_decompose(filename, path, prefix, postfix, PATH_MAX, errp)) {
2704 ret = -EINVAL;
2705 goto exit;
2706 }
2707 /* Read out options */
2708 total_size = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0),
2709 BDRV_SECTOR_SIZE);
2710 adapter_type = qemu_opt_get_del(opts, BLOCK_OPT_ADAPTER_TYPE);
2711 backing_file = qemu_opt_get_del(opts, BLOCK_OPT_BACKING_FILE);
2712 hw_version = qemu_opt_get_del(opts, BLOCK_OPT_HWVERSION);
2713 toolsversion = qemu_opt_get_del(opts, BLOCK_OPT_TOOLSVERSION);
2714 compat6 = qemu_opt_get_bool_del(opts, BLOCK_OPT_COMPAT6, false);
2715 if (strcmp(hw_version, "undefined") == 0) {
2716 g_free(hw_version);
2717 hw_version = NULL;
2718 }
2719 fmt = qemu_opt_get_del(opts, BLOCK_OPT_SUBFMT);
2720 zeroed_grain = qemu_opt_get_bool_del(opts, BLOCK_OPT_ZEROED_GRAIN, false);
2721
2722 if (adapter_type) {
2723 adapter_type_enum = qapi_enum_parse(&BlockdevVmdkAdapterType_lookup,
2724 adapter_type,
2725 BLOCKDEV_VMDK_ADAPTER_TYPE_IDE,
2726 &local_err);
2727 if (local_err) {
2728 error_propagate(errp, local_err);
2729 ret = -EINVAL;
2730 goto exit;
2731 }
2732 } else {
2733 adapter_type_enum = BLOCKDEV_VMDK_ADAPTER_TYPE_IDE;
2734 }
2735
2736 if (!fmt) {
2737 /* Default format to monolithicSparse */
2738 subformat = BLOCKDEV_VMDK_SUBFORMAT_MONOLITHICSPARSE;
2739 } else {
2740 subformat = qapi_enum_parse(&BlockdevVmdkSubformat_lookup,
2741 fmt,
2742 BLOCKDEV_VMDK_SUBFORMAT_MONOLITHICSPARSE,
2743 &local_err);
2744 if (local_err) {
2745 error_propagate(errp, local_err);
2746 ret = -EINVAL;
2747 goto exit;
2748 }
2749 }
2750 data = (VMDKCreateOptsData){
2751 .prefix = prefix,
2752 .postfix = postfix,
2753 .path = path,
2754 .opts = opts,
2755 };
2756 ret = vmdk_co_do_create(total_size, subformat, adapter_type_enum,
2757 backing_file, hw_version, toolsversion, compat6,
2758 zeroed_grain, vmdk_co_create_opts_cb, &data, errp);
2759
2760 exit:
2761 g_free(backing_fmt);
2762 g_free(adapter_type);
2763 g_free(backing_file);
2764 g_free(hw_version);
2765 g_free(toolsversion);
2766 g_free(fmt);
2767 g_free(desc);
2768 g_free(path);
2769 g_free(prefix);
2770 g_free(postfix);
2771 g_free(desc_line);
2772 g_free(ext_filename);
2773 g_free(desc_filename);
2774 g_free(parent_desc_line);
2775 return ret;
2776 }
2777
2778 static BlockBackend *vmdk_co_create_cb(int64_t size, int idx,
2779 bool flat, bool split, bool compress,
2780 bool zeroed_grain, void *opaque,
2781 Error **errp)
2782 {
2783 int ret;
2784 BlockDriverState *bs;
2785 BlockBackend *blk;
2786 BlockdevCreateOptionsVmdk *opts = opaque;
2787
2788 if (idx == 0) {
2789 bs = bdrv_open_blockdev_ref(opts->file, errp);
2790 } else {
2791 int i;
2792 BlockdevRefList *list = opts->extents;
2793 for (i = 1; i < idx; i++) {
2794 if (!list || !list->next) {
2795 error_setg(errp, "Extent [%d] not specified", i);
2796 return NULL;
2797 }
2798 list = list->next;
2799 }
2800 if (!list) {
2801 error_setg(errp, "Extent [%d] not specified", idx - 1);
2802 return NULL;
2803 }
2804 bs = bdrv_open_blockdev_ref(list->value, errp);
2805 }
2806 if (!bs) {
2807 return NULL;
2808 }
2809 blk = blk_new_with_bs(bs,
2810 BLK_PERM_CONSISTENT_READ | BLK_PERM_WRITE | BLK_PERM_RESIZE,
2811 BLK_PERM_ALL, errp);
2812 if (!blk) {
2813 return NULL;
2814 }
2815 blk_set_allow_write_beyond_eof(blk, true);
2816 bdrv_unref(bs);
2817
2818 if (size != -1) {
2819 ret = vmdk_init_extent(blk, size, flat, compress, zeroed_grain, errp);
2820 if (ret) {
2821 blk_unref(blk);
2822 blk = NULL;
2823 }
2824 }
2825 return blk;
2826 }
2827
2828 static int coroutine_fn vmdk_co_create(BlockdevCreateOptions *create_options,
2829 Error **errp)
2830 {
2831 int ret;
2832 BlockdevCreateOptionsVmdk *opts;
2833
2834 opts = &create_options->u.vmdk;
2835
2836 /* Validate options */
2837 if (!QEMU_IS_ALIGNED(opts->size, BDRV_SECTOR_SIZE)) {
2838 error_setg(errp, "Image size must be a multiple of 512 bytes");
2839 ret = -EINVAL;
2840 goto out;
2841 }
2842
2843 ret = vmdk_co_do_create(opts->size,
2844 opts->subformat,
2845 opts->adapter_type,
2846 opts->backing_file,
2847 opts->hwversion,
2848 opts->toolsversion,
2849 false,
2850 opts->zeroed_grain,
2851 vmdk_co_create_cb,
2852 opts, errp);
2853 return ret;
2854
2855 out:
2856 return ret;
2857 }
2858
2859 static void vmdk_close(BlockDriverState *bs)
2860 {
2861 BDRVVmdkState *s = bs->opaque;
2862
2863 vmdk_free_extents(bs);
2864 g_free(s->create_type);
2865
2866 migrate_del_blocker(s->migration_blocker);
2867 error_free(s->migration_blocker);
2868 }
2869
2870 static int64_t vmdk_get_allocated_file_size(BlockDriverState *bs)
2871 {
2872 int i;
2873 int64_t ret = 0;
2874 int64_t r;
2875 BDRVVmdkState *s = bs->opaque;
2876
2877 ret = bdrv_get_allocated_file_size(bs->file->bs);
2878 if (ret < 0) {
2879 return ret;
2880 }
2881 for (i = 0; i < s->num_extents; i++) {
2882 if (s->extents[i].file == bs->file) {
2883 continue;
2884 }
2885 r = bdrv_get_allocated_file_size(s->extents[i].file->bs);
2886 if (r < 0) {
2887 return r;
2888 }
2889 ret += r;
2890 }
2891 return ret;
2892 }
2893
2894 static int vmdk_has_zero_init(BlockDriverState *bs)
2895 {
2896 int i;
2897 BDRVVmdkState *s = bs->opaque;
2898
2899 /* If has a flat extent and its underlying storage doesn't have zero init,
2900 * return 0. */
2901 for (i = 0; i < s->num_extents; i++) {
2902 if (s->extents[i].flat) {
2903 if (!bdrv_has_zero_init(s->extents[i].file->bs)) {
2904 return 0;
2905 }
2906 }
2907 }
2908 return 1;
2909 }
2910
2911 static ImageInfo *vmdk_get_extent_info(VmdkExtent *extent)
2912 {
2913 ImageInfo *info = g_new0(ImageInfo, 1);
2914
2915 bdrv_refresh_filename(extent->file->bs);
2916 *info = (ImageInfo){
2917 .filename = g_strdup(extent->file->bs->filename),
2918 .format = g_strdup(extent->type),
2919 .virtual_size = extent->sectors * BDRV_SECTOR_SIZE,
2920 .compressed = extent->compressed,
2921 .has_compressed = extent->compressed,
2922 .cluster_size = extent->cluster_sectors * BDRV_SECTOR_SIZE,
2923 .has_cluster_size = !extent->flat,
2924 };
2925
2926 return info;
2927 }
2928
2929 static int coroutine_fn vmdk_co_check(BlockDriverState *bs,
2930 BdrvCheckResult *result,
2931 BdrvCheckMode fix)
2932 {
2933 BDRVVmdkState *s = bs->opaque;
2934 VmdkExtent *extent = NULL;
2935 int64_t sector_num = 0;
2936 int64_t total_sectors = bdrv_nb_sectors(bs);
2937 int ret;
2938 uint64_t cluster_offset;
2939
2940 if (fix) {
2941 return -ENOTSUP;
2942 }
2943
2944 for (;;) {
2945 if (sector_num >= total_sectors) {
2946 return 0;
2947 }
2948 extent = find_extent(s, sector_num, extent);
2949 if (!extent) {
2950 fprintf(stderr,
2951 "ERROR: could not find extent for sector %" PRId64 "\n",
2952 sector_num);
2953 ret = -EINVAL;
2954 break;
2955 }
2956 ret = get_cluster_offset(bs, extent, NULL,
2957 sector_num << BDRV_SECTOR_BITS,
2958 false, &cluster_offset, 0, 0);
2959 if (ret == VMDK_ERROR) {
2960 fprintf(stderr,
2961 "ERROR: could not get cluster_offset for sector %"
2962 PRId64 "\n", sector_num);
2963 break;
2964 }
2965 if (ret == VMDK_OK) {
2966 int64_t extent_len = bdrv_getlength(extent->file->bs);
2967 if (extent_len < 0) {
2968 fprintf(stderr,
2969 "ERROR: could not get extent file length for sector %"
2970 PRId64 "\n", sector_num);
2971 ret = extent_len;
2972 break;
2973 }
2974 if (cluster_offset >= extent_len) {
2975 fprintf(stderr,
2976 "ERROR: cluster offset for sector %"
2977 PRId64 " points after EOF\n", sector_num);
2978 ret = -EINVAL;
2979 break;
2980 }
2981 }
2982 sector_num += extent->cluster_sectors;
2983 }
2984
2985 result->corruptions++;
2986 return ret;
2987 }
2988
2989 static ImageInfoSpecific *vmdk_get_specific_info(BlockDriverState *bs,
2990 Error **errp)
2991 {
2992 int i;
2993 BDRVVmdkState *s = bs->opaque;
2994 ImageInfoSpecific *spec_info = g_new0(ImageInfoSpecific, 1);
2995 ImageInfoList **tail;
2996
2997 *spec_info = (ImageInfoSpecific){
2998 .type = IMAGE_INFO_SPECIFIC_KIND_VMDK,
2999 .u = {
3000 .vmdk.data = g_new0(ImageInfoSpecificVmdk, 1),
3001 },
3002 };
3003
3004 *spec_info->u.vmdk.data = (ImageInfoSpecificVmdk) {
3005 .create_type = g_strdup(s->create_type),
3006 .cid = s->cid,
3007 .parent_cid = s->parent_cid,
3008 };
3009
3010 tail = &spec_info->u.vmdk.data->extents;
3011 for (i = 0; i < s->num_extents; i++) {
3012 QAPI_LIST_APPEND(tail, vmdk_get_extent_info(&s->extents[i]));
3013 }
3014
3015 return spec_info;
3016 }
3017
3018 static bool vmdk_extents_type_eq(const VmdkExtent *a, const VmdkExtent *b)
3019 {
3020 return a->flat == b->flat &&
3021 a->compressed == b->compressed &&
3022 (a->flat || a->cluster_sectors == b->cluster_sectors);
3023 }
3024
3025 static int vmdk_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
3026 {
3027 int i;
3028 BDRVVmdkState *s = bs->opaque;
3029 assert(s->num_extents);
3030
3031 /* See if we have multiple extents but they have different cases */
3032 for (i = 1; i < s->num_extents; i++) {
3033 if (!vmdk_extents_type_eq(&s->extents[0], &s->extents[i])) {
3034 return -ENOTSUP;
3035 }
3036 }
3037 bdi->needs_compressed_writes = s->extents[0].compressed;
3038 if (!s->extents[0].flat) {
3039 bdi->cluster_size = s->extents[0].cluster_sectors << BDRV_SECTOR_BITS;
3040 }
3041 return 0;
3042 }
3043
3044 static void vmdk_gather_child_options(BlockDriverState *bs, QDict *target,
3045 bool backing_overridden)
3046 {
3047 /* No children but file and backing can be explicitly specified (TODO) */
3048 qdict_put(target, "file",
3049 qobject_ref(bs->file->bs->full_open_options));
3050
3051 if (backing_overridden) {
3052 if (bs->backing) {
3053 qdict_put(target, "backing",
3054 qobject_ref(bs->backing->bs->full_open_options));
3055 } else {
3056 qdict_put_null(target, "backing");
3057 }
3058 }
3059 }
3060
3061 static QemuOptsList vmdk_create_opts = {
3062 .name = "vmdk-create-opts",
3063 .head = QTAILQ_HEAD_INITIALIZER(vmdk_create_opts.head),
3064 .desc = {
3065 {
3066 .name = BLOCK_OPT_SIZE,
3067 .type = QEMU_OPT_SIZE,
3068 .help = "Virtual disk size"
3069 },
3070 {
3071 .name = BLOCK_OPT_ADAPTER_TYPE,
3072 .type = QEMU_OPT_STRING,
3073 .help = "Virtual adapter type, can be one of "
3074 "ide (default), lsilogic, buslogic or legacyESX"
3075 },
3076 {
3077 .name = BLOCK_OPT_BACKING_FILE,
3078 .type = QEMU_OPT_STRING,
3079 .help = "File name of a base image"
3080 },
3081 {
3082 .name = BLOCK_OPT_BACKING_FMT,
3083 .type = QEMU_OPT_STRING,
3084 .help = "Must be 'vmdk' if present",
3085 },
3086 {
3087 .name = BLOCK_OPT_COMPAT6,
3088 .type = QEMU_OPT_BOOL,
3089 .help = "VMDK version 6 image",
3090 .def_value_str = "off"
3091 },
3092 {
3093 .name = BLOCK_OPT_HWVERSION,
3094 .type = QEMU_OPT_STRING,
3095 .help = "VMDK hardware version",
3096 .def_value_str = "undefined"
3097 },
3098 {
3099 .name = BLOCK_OPT_TOOLSVERSION,
3100 .type = QEMU_OPT_STRING,
3101 .help = "VMware guest tools version",
3102 },
3103 {
3104 .name = BLOCK_OPT_SUBFMT,
3105 .type = QEMU_OPT_STRING,
3106 .help =
3107 "VMDK flat extent format, can be one of "
3108 "{monolithicSparse (default) | monolithicFlat | twoGbMaxExtentSparse | twoGbMaxExtentFlat | streamOptimized} "
3109 },
3110 {
3111 .name = BLOCK_OPT_ZEROED_GRAIN,
3112 .type = QEMU_OPT_BOOL,
3113 .help = "Enable efficient zero writes "
3114 "using the zeroed-grain GTE feature"
3115 },
3116 { /* end of list */ }
3117 }
3118 };
3119
3120 static BlockDriver bdrv_vmdk = {
3121 .format_name = "vmdk",
3122 .instance_size = sizeof(BDRVVmdkState),
3123 .bdrv_probe = vmdk_probe,
3124 .bdrv_open = vmdk_open,
3125 .bdrv_co_check = vmdk_co_check,
3126 .bdrv_reopen_prepare = vmdk_reopen_prepare,
3127 .bdrv_reopen_commit = vmdk_reopen_commit,
3128 .bdrv_reopen_abort = vmdk_reopen_abort,
3129 .bdrv_child_perm = bdrv_default_perms,
3130 .bdrv_co_preadv = vmdk_co_preadv,
3131 .bdrv_co_pwritev = vmdk_co_pwritev,
3132 .bdrv_co_pwritev_compressed = vmdk_co_pwritev_compressed,
3133 .bdrv_co_pwrite_zeroes = vmdk_co_pwrite_zeroes,
3134 .bdrv_close = vmdk_close,
3135 .bdrv_co_create_opts = vmdk_co_create_opts,
3136 .bdrv_co_create = vmdk_co_create,
3137 .bdrv_co_block_status = vmdk_co_block_status,
3138 .bdrv_get_allocated_file_size = vmdk_get_allocated_file_size,
3139 .bdrv_has_zero_init = vmdk_has_zero_init,
3140 .bdrv_get_specific_info = vmdk_get_specific_info,
3141 .bdrv_refresh_limits = vmdk_refresh_limits,
3142 .bdrv_get_info = vmdk_get_info,
3143 .bdrv_gather_child_options = vmdk_gather_child_options,
3144
3145 .is_format = true,
3146 .supports_backing = true,
3147 .create_opts = &vmdk_create_opts,
3148 };
3149
3150 static void bdrv_vmdk_init(void)
3151 {
3152 bdrv_register(&bdrv_vmdk);
3153 }
3154
3155 block_init(bdrv_vmdk_init);
Ray Wang's QEMU Repository