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spapr: Clean up local variable shadowing in spapr_dt_cpus()
[qemu/kevin.git] / block / vmdk.c
blobe90649c8bf2692f43727fc6c76ea223767783886
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 bdrv_graph_wrlock(NULL);
276 for (i = 0; i < s->num_extents; i++) {
277 e = &s->extents[i];
278 g_free(e->l1_table);
279 g_free(e->l2_cache);
280 g_free(e->l1_backup_table);
281 g_free(e->type);
282 if (e->file != bs->file) {
283 bdrv_unref_child(bs, e->file);
284 }
285 }
286 bdrv_graph_wrunlock();
287
288 g_free(s->extents);
289 }
290
291 static void vmdk_free_last_extent(BlockDriverState *bs)
292 {
293 BDRVVmdkState *s = bs->opaque;
294
295 if (s->num_extents == 0) {
296 return;
297 }
298 s->num_extents--;
299 s->extents = g_renew(VmdkExtent, s->extents, s->num_extents);
300 }
301
302 /* Return -ve errno, or 0 on success and write CID into *pcid. */
303 static int vmdk_read_cid(BlockDriverState *bs, int parent, uint32_t *pcid)
304 {
305 char *desc;
306 uint32_t cid;
307 const char *p_name, *cid_str;
308 size_t cid_str_size;
309 BDRVVmdkState *s = bs->opaque;
310 int ret;
311
312 desc = g_malloc0(DESC_SIZE);
313 ret = bdrv_pread(bs->file, s->desc_offset, DESC_SIZE, desc, 0);
314 if (ret < 0) {
315 goto out;
316 }
317
318 if (parent) {
319 cid_str = "parentCID";
320 cid_str_size = sizeof("parentCID");
321 } else {
322 cid_str = "CID";
323 cid_str_size = sizeof("CID");
324 }
325
326 desc[DESC_SIZE - 1] = '\0';
327 p_name = strstr(desc, cid_str);
328 if (p_name == NULL) {
329 ret = -EINVAL;
330 goto out;
331 }
332 p_name += cid_str_size;
333 if (sscanf(p_name, "%" SCNx32, &cid) != 1) {
334 ret = -EINVAL;
335 goto out;
336 }
337 *pcid = cid;
338 ret = 0;
339
340 out:
341 g_free(desc);
342 return ret;
343 }
344
345 static int coroutine_fn GRAPH_RDLOCK
346 vmdk_write_cid(BlockDriverState *bs, uint32_t cid)
347 {
348 char *desc, *tmp_desc;
349 char *p_name, *tmp_str;
350 BDRVVmdkState *s = bs->opaque;
351 int ret = 0;
352
353 desc = g_malloc0(DESC_SIZE);
354 tmp_desc = g_malloc0(DESC_SIZE);
355 ret = bdrv_co_pread(bs->file, s->desc_offset, DESC_SIZE, desc, 0);
356 if (ret < 0) {
357 goto out;
358 }
359
360 desc[DESC_SIZE - 1] = '\0';
361 tmp_str = strstr(desc, "parentCID");
362 if (tmp_str == NULL) {
363 ret = -EINVAL;
364 goto out;
365 }
366
367 pstrcpy(tmp_desc, DESC_SIZE, tmp_str);
368 p_name = strstr(desc, "CID");
369 if (p_name != NULL) {
370 p_name += sizeof("CID");
371 snprintf(p_name, DESC_SIZE - (p_name - desc), "%" PRIx32 "\n", cid);
372 pstrcat(desc, DESC_SIZE, tmp_desc);
373 }
374
375 ret = bdrv_co_pwrite_sync(bs->file, s->desc_offset, DESC_SIZE, desc, 0);
376
377 out:
378 g_free(desc);
379 g_free(tmp_desc);
380 return ret;
381 }
382
383 static int coroutine_fn vmdk_is_cid_valid(BlockDriverState *bs)
384 {
385 BDRVVmdkState *s = bs->opaque;
386 uint32_t cur_pcid;
387
388 if (!s->cid_checked && bs->backing) {
389 BlockDriverState *p_bs = bs->backing->bs;
390
391 if (strcmp(p_bs->drv->format_name, "vmdk")) {
392 /* Backing file is not in vmdk format, so it does not have
393 * a CID, which makes the overlay's parent CID invalid */
394 return 0;
395 }
396
397 if (vmdk_read_cid(p_bs, 0, &cur_pcid) != 0) {
398 /* read failure: report as not valid */
399 return 0;
400 }
401 if (s->parent_cid != cur_pcid) {
402 /* CID not valid */
403 return 0;
404 }
405 }
406 s->cid_checked = true;
407 /* CID valid */
408 return 1;
409 }
410
411 static int vmdk_reopen_prepare(BDRVReopenState *state,
412 BlockReopenQueue *queue, Error **errp)
413 {
414 BDRVVmdkState *s;
415 BDRVVmdkReopenState *rs;
416 int i;
417
418 assert(state != NULL);
419 assert(state->bs != NULL);
420 assert(state->opaque == NULL);
421
422 s = state->bs->opaque;
423
424 rs = g_new0(BDRVVmdkReopenState, 1);
425 state->opaque = rs;
426
427 /*
428 * Check whether there are any extents stored in bs->file; if bs->file
429 * changes, we will need to update their .file pointers to follow suit
430 */
431 rs->extents_using_bs_file = g_new(bool, s->num_extents);
432 for (i = 0; i < s->num_extents; i++) {
433 rs->extents_using_bs_file[i] = s->extents[i].file == state->bs->file;
434 }
435
436 return 0;
437 }
438
439 static void vmdk_reopen_clean(BDRVReopenState *state)
440 {
441 BDRVVmdkReopenState *rs = state->opaque;
442
443 g_free(rs->extents_using_bs_file);
444 g_free(rs);
445 state->opaque = NULL;
446 }
447
448 static void vmdk_reopen_commit(BDRVReopenState *state)
449 {
450 BDRVVmdkState *s = state->bs->opaque;
451 BDRVVmdkReopenState *rs = state->opaque;
452 int i;
453
454 for (i = 0; i < s->num_extents; i++) {
455 if (rs->extents_using_bs_file[i]) {
456 s->extents[i].file = state->bs->file;
457 }
458 }
459
460 vmdk_reopen_clean(state);
461 }
462
463 static void vmdk_reopen_abort(BDRVReopenState *state)
464 {
465 vmdk_reopen_clean(state);
466 }
467
468 static int vmdk_parent_open(BlockDriverState *bs)
469 {
470 char *p_name;
471 char *desc;
472 BDRVVmdkState *s = bs->opaque;
473 int ret;
474
475 desc = g_malloc0(DESC_SIZE + 1);
476 ret = bdrv_pread(bs->file, s->desc_offset, DESC_SIZE, desc, 0);
477 if (ret < 0) {
478 goto out;
479 }
480
481 p_name = strstr(desc, "parentFileNameHint");
482 if (p_name != NULL) {
483 char *end_name;
484
485 p_name += sizeof("parentFileNameHint") + 1;
486 end_name = strchr(p_name, '\"');
487 if (end_name == NULL) {
488 ret = -EINVAL;
489 goto out;
490 }
491 if ((end_name - p_name) > sizeof(bs->auto_backing_file) - 1) {
492 ret = -EINVAL;
493 goto out;
494 }
495
496 pstrcpy(bs->auto_backing_file, end_name - p_name + 1, p_name);
497 pstrcpy(bs->backing_file, sizeof(bs->backing_file),
498 bs->auto_backing_file);
499 pstrcpy(bs->backing_format, sizeof(bs->backing_format),
500 "vmdk");
501 }
502
503 out:
504 g_free(desc);
505 return ret;
506 }
507
508 /* Create and append extent to the extent array. Return the added VmdkExtent
509 * address. return NULL if allocation failed. */
510 static int vmdk_add_extent(BlockDriverState *bs,
511 BdrvChild *file, bool flat, int64_t sectors,
512 int64_t l1_offset, int64_t l1_backup_offset,
513 uint32_t l1_size,
514 int l2_size, uint64_t cluster_sectors,
515 VmdkExtent **new_extent,
516 Error **errp)
517 {
518 VmdkExtent *extent;
519 BDRVVmdkState *s = bs->opaque;
520 int64_t nb_sectors;
521
522 if (cluster_sectors > 0x200000) {
523 /* 0x200000 * 512Bytes = 1GB for one cluster is unrealistic */
524 error_setg(errp, "Invalid granularity, image may be corrupt");
525 return -EFBIG;
526 }
527 if (l1_size > 32 * 1024 * 1024) {
528 /*
529 * Although with big capacity and small l1_entry_sectors, we can get a
530 * big l1_size, we don't want unbounded value to allocate the table.
531 * Limit it to 32M, which is enough to store:
532 * 8TB - for both VMDK3 & VMDK4 with
533 * minimal cluster size: 512B
534 * minimal L2 table size: 512 entries
535 * 8 TB is still more than the maximal value supported for
536 * VMDK3 & VMDK4 which is 2TB.
537 * 64TB - for "ESXi seSparse Extent"
538 * minimal cluster size: 512B (default is 4KB)
539 * L2 table size: 4096 entries (const).
540 * 64TB is more than the maximal value supported for
541 * seSparse VMDKs (which is slightly less than 64TB)
542 */
543 error_setg(errp, "L1 size too big");
544 return -EFBIG;
545 }
546
547 nb_sectors = bdrv_nb_sectors(file->bs);
548 if (nb_sectors < 0) {
549 return nb_sectors;
550 }
551
552 s->extents = g_renew(VmdkExtent, s->extents, s->num_extents + 1);
553 extent = &s->extents[s->num_extents];
554 s->num_extents++;
555
556 memset(extent, 0, sizeof(VmdkExtent));
557 extent->file = file;
558 extent->flat = flat;
559 extent->sectors = sectors;
560 extent->l1_table_offset = l1_offset;
561 extent->l1_backup_table_offset = l1_backup_offset;
562 extent->l1_size = l1_size;
563 extent->l1_entry_sectors = l2_size * cluster_sectors;
564 extent->l2_size = l2_size;
565 extent->cluster_sectors = flat ? sectors : cluster_sectors;
566 extent->next_cluster_sector = ROUND_UP(nb_sectors, cluster_sectors);
567 extent->entry_size = sizeof(uint32_t);
568
569 if (s->num_extents > 1) {
570 extent->end_sector = (*(extent - 1)).end_sector + extent->sectors;
571 } else {
572 extent->end_sector = extent->sectors;
573 }
574 bs->total_sectors = extent->end_sector;
575 if (new_extent) {
576 *new_extent = extent;
577 }
578 return 0;
579 }
580
581 static int vmdk_init_tables(BlockDriverState *bs, VmdkExtent *extent,
582 Error **errp)
583 {
584 int ret;
585 size_t l1_size;
586 int i;
587
588 /* read the L1 table */
589 l1_size = extent->l1_size * extent->entry_size;
590 extent->l1_table = g_try_malloc(l1_size);
591 if (l1_size && extent->l1_table == NULL) {
592 return -ENOMEM;
593 }
594
595 ret = bdrv_pread(extent->file, extent->l1_table_offset, l1_size,
596 extent->l1_table, 0);
597 if (ret < 0) {
598 bdrv_refresh_filename(extent->file->bs);
599 error_setg_errno(errp, -ret,
600 "Could not read l1 table from extent '%s'",
601 extent->file->bs->filename);
602 goto fail_l1;
603 }
604 for (i = 0; i < extent->l1_size; i++) {
605 if (extent->entry_size == sizeof(uint64_t)) {
606 le64_to_cpus((uint64_t *)extent->l1_table + i);
607 } else {
608 assert(extent->entry_size == sizeof(uint32_t));
609 le32_to_cpus((uint32_t *)extent->l1_table + i);
610 }
611 }
612
613 if (extent->l1_backup_table_offset) {
614 assert(!extent->sesparse);
615 extent->l1_backup_table = g_try_malloc(l1_size);
616 if (l1_size && extent->l1_backup_table == NULL) {
617 ret = -ENOMEM;
618 goto fail_l1;
619 }
620 ret = bdrv_pread(extent->file, extent->l1_backup_table_offset,
621 l1_size, extent->l1_backup_table, 0);
622 if (ret < 0) {
623 bdrv_refresh_filename(extent->file->bs);
624 error_setg_errno(errp, -ret,
625 "Could not read l1 backup table from extent '%s'",
626 extent->file->bs->filename);
627 goto fail_l1b;
628 }
629 for (i = 0; i < extent->l1_size; i++) {
630 le32_to_cpus(&extent->l1_backup_table[i]);
631 }
632 }
633
634 extent->l2_cache =
635 g_malloc(extent->entry_size * extent->l2_size * L2_CACHE_SIZE);
636 return 0;
637 fail_l1b:
638 g_free(extent->l1_backup_table);
639 fail_l1:
640 g_free(extent->l1_table);
641 return ret;
642 }
643
644 static int vmdk_open_vmfs_sparse(BlockDriverState *bs,
645 BdrvChild *file,
646 int flags, Error **errp)
647 {
648 int ret;
649 uint32_t magic;
650 VMDK3Header header;
651 VmdkExtent *extent = NULL;
652
653 ret = bdrv_pread(file, sizeof(magic), sizeof(header), &header, 0);
654 if (ret < 0) {
655 bdrv_refresh_filename(file->bs);
656 error_setg_errno(errp, -ret,
657 "Could not read header from file '%s'",
658 file->bs->filename);
659 return ret;
660 }
661 ret = vmdk_add_extent(bs, file, false,
662 le32_to_cpu(header.disk_sectors),
663 (int64_t)le32_to_cpu(header.l1dir_offset) << 9,
664 0,
665 le32_to_cpu(header.l1dir_size),
666 4096,
667 le32_to_cpu(header.granularity),
668 &extent,
669 errp);
670 if (ret < 0) {
671 return ret;
672 }
673 ret = vmdk_init_tables(bs, extent, errp);
674 if (ret) {
675 /* free extent allocated by vmdk_add_extent */
676 vmdk_free_last_extent(bs);
677 }
678 return ret;
679 }
680
681 #define SESPARSE_CONST_HEADER_MAGIC UINT64_C(0x00000000cafebabe)
682 #define SESPARSE_VOLATILE_HEADER_MAGIC UINT64_C(0x00000000cafecafe)
683
684 /* Strict checks - format not officially documented */
685 static int check_se_sparse_const_header(VMDKSESparseConstHeader *header,
686 Error **errp)
687 {
688 header->magic = le64_to_cpu(header->magic);
689 header->version = le64_to_cpu(header->version);
690 header->grain_size = le64_to_cpu(header->grain_size);
691 header->grain_table_size = le64_to_cpu(header->grain_table_size);
692 header->flags = le64_to_cpu(header->flags);
693 header->reserved1 = le64_to_cpu(header->reserved1);
694 header->reserved2 = le64_to_cpu(header->reserved2);
695 header->reserved3 = le64_to_cpu(header->reserved3);
696 header->reserved4 = le64_to_cpu(header->reserved4);
697
698 header->volatile_header_offset =
699 le64_to_cpu(header->volatile_header_offset);
700 header->volatile_header_size = le64_to_cpu(header->volatile_header_size);
701
702 header->journal_header_offset = le64_to_cpu(header->journal_header_offset);
703 header->journal_header_size = le64_to_cpu(header->journal_header_size);
704
705 header->journal_offset = le64_to_cpu(header->journal_offset);
706 header->journal_size = le64_to_cpu(header->journal_size);
707
708 header->grain_dir_offset = le64_to_cpu(header->grain_dir_offset);
709 header->grain_dir_size = le64_to_cpu(header->grain_dir_size);
710
711 header->grain_tables_offset = le64_to_cpu(header->grain_tables_offset);
712 header->grain_tables_size = le64_to_cpu(header->grain_tables_size);
713
714 header->free_bitmap_offset = le64_to_cpu(header->free_bitmap_offset);
715 header->free_bitmap_size = le64_to_cpu(header->free_bitmap_size);
716
717 header->backmap_offset = le64_to_cpu(header->backmap_offset);
718 header->backmap_size = le64_to_cpu(header->backmap_size);
719
720 header->grains_offset = le64_to_cpu(header->grains_offset);
721 header->grains_size = le64_to_cpu(header->grains_size);
722
723 if (header->magic != SESPARSE_CONST_HEADER_MAGIC) {
724 error_setg(errp, "Bad const header magic: 0x%016" PRIx64,
725 header->magic);
726 return -EINVAL;
727 }
728
729 if (header->version != 0x0000000200000001) {
730 error_setg(errp, "Unsupported version: 0x%016" PRIx64,
731 header->version);
732 return -ENOTSUP;
733 }
734
735 if (header->grain_size != 8) {
736 error_setg(errp, "Unsupported grain size: %" PRIu64,
737 header->grain_size);
738 return -ENOTSUP;
739 }
740
741 if (header->grain_table_size != 64) {
742 error_setg(errp, "Unsupported grain table size: %" PRIu64,
743 header->grain_table_size);
744 return -ENOTSUP;
745 }
746
747 if (header->flags != 0) {
748 error_setg(errp, "Unsupported flags: 0x%016" PRIx64,
749 header->flags);
750 return -ENOTSUP;
751 }
752
753 if (header->reserved1 != 0 || header->reserved2 != 0 ||
754 header->reserved3 != 0 || header->reserved4 != 0) {
755 error_setg(errp, "Unsupported reserved bits:"
756 " 0x%016" PRIx64 " 0x%016" PRIx64
757 " 0x%016" PRIx64 " 0x%016" PRIx64,
758 header->reserved1, header->reserved2,
759 header->reserved3, header->reserved4);
760 return -ENOTSUP;
761 }
762
763 /* check that padding is 0 */
764 if (!buffer_is_zero(header->pad, sizeof(header->pad))) {
765 error_setg(errp, "Unsupported non-zero const header padding");
766 return -ENOTSUP;
767 }
768
769 return 0;
770 }
771
772 static int check_se_sparse_volatile_header(VMDKSESparseVolatileHeader *header,
773 Error **errp)
774 {
775 header->magic = le64_to_cpu(header->magic);
776 header->free_gt_number = le64_to_cpu(header->free_gt_number);
777 header->next_txn_seq_number = le64_to_cpu(header->next_txn_seq_number);
778 header->replay_journal = le64_to_cpu(header->replay_journal);
779
780 if (header->magic != SESPARSE_VOLATILE_HEADER_MAGIC) {
781 error_setg(errp, "Bad volatile header magic: 0x%016" PRIx64,
782 header->magic);
783 return -EINVAL;
784 }
785
786 if (header->replay_journal) {
787 error_setg(errp, "Image is dirty, Replaying journal not supported");
788 return -ENOTSUP;
789 }
790
791 /* check that padding is 0 */
792 if (!buffer_is_zero(header->pad, sizeof(header->pad))) {
793 error_setg(errp, "Unsupported non-zero volatile header padding");
794 return -ENOTSUP;
795 }
796
797 return 0;
798 }
799
800 static int vmdk_open_se_sparse(BlockDriverState *bs,
801 BdrvChild *file,
802 int flags, Error **errp)
803 {
804 int ret;
805 VMDKSESparseConstHeader const_header;
806 VMDKSESparseVolatileHeader volatile_header;
807 VmdkExtent *extent = NULL;
808
809 ret = bdrv_apply_auto_read_only(bs,
810 "No write support for seSparse images available", errp);
811 if (ret < 0) {
812 return ret;
813 }
814
815 assert(sizeof(const_header) == SECTOR_SIZE);
816
817 ret = bdrv_pread(file, 0, sizeof(const_header), &const_header, 0);
818 if (ret < 0) {
819 bdrv_refresh_filename(file->bs);
820 error_setg_errno(errp, -ret,
821 "Could not read const header from file '%s'",
822 file->bs->filename);
823 return ret;
824 }
825
826 /* check const header */
827 ret = check_se_sparse_const_header(&const_header, errp);
828 if (ret < 0) {
829 return ret;
830 }
831
832 assert(sizeof(volatile_header) == SECTOR_SIZE);
833
834 ret = bdrv_pread(file, const_header.volatile_header_offset * SECTOR_SIZE,
835 sizeof(volatile_header), &volatile_header, 0);
836 if (ret < 0) {
837 bdrv_refresh_filename(file->bs);
838 error_setg_errno(errp, -ret,
839 "Could not read volatile header from file '%s'",
840 file->bs->filename);
841 return ret;
842 }
843
844 /* check volatile header */
845 ret = check_se_sparse_volatile_header(&volatile_header, errp);
846 if (ret < 0) {
847 return ret;
848 }
849
850 ret = vmdk_add_extent(bs, file, false,
851 const_header.capacity,
852 const_header.grain_dir_offset * SECTOR_SIZE,
853 0,
854 const_header.grain_dir_size *
855 SECTOR_SIZE / sizeof(uint64_t),
856 const_header.grain_table_size *
857 SECTOR_SIZE / sizeof(uint64_t),
858 const_header.grain_size,
859 &extent,
860 errp);
861 if (ret < 0) {
862 return ret;
863 }
864
865 extent->sesparse = true;
866 extent->sesparse_l2_tables_offset = const_header.grain_tables_offset;
867 extent->sesparse_clusters_offset = const_header.grains_offset;
868 extent->entry_size = sizeof(uint64_t);
869
870 ret = vmdk_init_tables(bs, extent, errp);
871 if (ret) {
872 /* free extent allocated by vmdk_add_extent */
873 vmdk_free_last_extent(bs);
874 }
875
876 return ret;
877 }
878
879 static int vmdk_open_desc_file(BlockDriverState *bs, int flags, char *buf,
880 QDict *options, Error **errp);
881
882 static char *vmdk_read_desc(BdrvChild *file, uint64_t desc_offset, Error **errp)
883 {
884 int64_t size;
885 char *buf;
886 int ret;
887
888 size = bdrv_getlength(file->bs);
889 if (size < 0) {
890 error_setg_errno(errp, -size, "Could not access file");
891 return NULL;
892 }
893
894 if (size < 4) {
895 /* Both descriptor file and sparse image must be much larger than 4
896 * bytes, also callers of vmdk_read_desc want to compare the first 4
897 * bytes with VMDK4_MAGIC, let's error out if less is read. */
898 error_setg(errp, "File is too small, not a valid image");
899 return NULL;
900 }
901
902 size = MIN(size, (1 << 20) - 1); /* avoid unbounded allocation */
903 buf = g_malloc(size + 1);
904
905 ret = bdrv_pread(file, desc_offset, size, buf, 0);
906 if (ret < 0) {
907 error_setg_errno(errp, -ret, "Could not read from file");
908 g_free(buf);
909 return NULL;
910 }
911 buf[size] = 0;
912
913 return buf;
914 }
915
916 static int vmdk_open_vmdk4(BlockDriverState *bs,
917 BdrvChild *file,
918 int flags, QDict *options, Error **errp)
919 {
920 int ret;
921 uint32_t magic;
922 uint32_t l1_size, l1_entry_sectors;
923 VMDK4Header header;
924 VmdkExtent *extent = NULL;
925 BDRVVmdkState *s = bs->opaque;
926 int64_t l1_backup_offset = 0;
927 bool compressed;
928
929 ret = bdrv_pread(file, sizeof(magic), sizeof(header), &header, 0);
930 if (ret < 0) {
931 bdrv_refresh_filename(file->bs);
932 error_setg_errno(errp, -ret,
933 "Could not read header from file '%s'",
934 file->bs->filename);
935 return -EINVAL;
936 }
937 if (header.capacity == 0) {
938 uint64_t desc_offset = le64_to_cpu(header.desc_offset);
939 if (desc_offset) {
940 char *buf = vmdk_read_desc(file, desc_offset << 9, errp);
941 if (!buf) {
942 return -EINVAL;
943 }
944 ret = vmdk_open_desc_file(bs, flags, buf, options, errp);
945 g_free(buf);
946 return ret;
947 }
948 }
949
950 if (!s->create_type) {
951 s->create_type = g_strdup("monolithicSparse");
952 }
953
954 if (le64_to_cpu(header.gd_offset) == VMDK4_GD_AT_END) {
955 /*
956 * The footer takes precedence over the header, so read it in. The
957 * footer starts at offset -1024 from the end: One sector for the
958 * footer, and another one for the end-of-stream marker.
959 */
960 struct {
961 struct {
962 uint64_t val;
963 uint32_t size;
964 uint32_t type;
965 uint8_t pad[512 - 16];
966 } QEMU_PACKED footer_marker;
967
968 uint32_t magic;
969 VMDK4Header header;
970 uint8_t pad[512 - 4 - sizeof(VMDK4Header)];
971
972 struct {
973 uint64_t val;
974 uint32_t size;
975 uint32_t type;
976 uint8_t pad[512 - 16];
977 } QEMU_PACKED eos_marker;
978 } QEMU_PACKED footer;
979
980 ret = bdrv_pread(file, bs->file->bs->total_sectors * 512 - 1536,
981 sizeof(footer), &footer, 0);
982 if (ret < 0) {
983 error_setg_errno(errp, -ret, "Failed to read footer");
984 return ret;
985 }
986
987 /* Some sanity checks for the footer */
988 if (be32_to_cpu(footer.magic) != VMDK4_MAGIC ||
989 le32_to_cpu(footer.footer_marker.size) != 0 ||
990 le32_to_cpu(footer.footer_marker.type) != MARKER_FOOTER ||
991 le64_to_cpu(footer.eos_marker.val) != 0 ||
992 le32_to_cpu(footer.eos_marker.size) != 0 ||
993 le32_to_cpu(footer.eos_marker.type) != MARKER_END_OF_STREAM)
994 {
995 error_setg(errp, "Invalid footer");
996 return -EINVAL;
997 }
998
999 header = footer.header;
1000 }
1001
1002 compressed =
1003 le16_to_cpu(header.compressAlgorithm) == VMDK4_COMPRESSION_DEFLATE;
1004 if (le32_to_cpu(header.version) > 3) {
1005 error_setg(errp, "Unsupported VMDK version %" PRIu32,
1006 le32_to_cpu(header.version));
1007 return -ENOTSUP;
1008 } else if (le32_to_cpu(header.version) == 3 && (flags & BDRV_O_RDWR) &&
1009 !compressed) {
1010 /* VMware KB 2064959 explains that version 3 added support for
1011 * persistent changed block tracking (CBT), and backup software can
1012 * read it as version=1 if it doesn't care about the changed area
1013 * information. So we are safe to enable read only. */
1014 error_setg(errp, "VMDK version 3 must be read only");
1015 return -EINVAL;
1016 }
1017
1018 if (le32_to_cpu(header.num_gtes_per_gt) > 512) {
1019 error_setg(errp, "L2 table size too big");
1020 return -EINVAL;
1021 }
1022
1023 l1_entry_sectors = le32_to_cpu(header.num_gtes_per_gt)
1024 * le64_to_cpu(header.granularity);
1025 if (l1_entry_sectors == 0) {
1026 error_setg(errp, "L1 entry size is invalid");
1027 return -EINVAL;
1028 }
1029 l1_size = (le64_to_cpu(header.capacity) + l1_entry_sectors - 1)
1030 / l1_entry_sectors;
1031 if (le32_to_cpu(header.flags) & VMDK4_FLAG_RGD) {
1032 l1_backup_offset = le64_to_cpu(header.rgd_offset) << 9;
1033 }
1034 if (bdrv_nb_sectors(file->bs) < le64_to_cpu(header.grain_offset)) {
1035 error_setg(errp, "File truncated, expecting at least %" PRId64 " bytes",
1036 (int64_t)(le64_to_cpu(header.grain_offset)
1037 * BDRV_SECTOR_SIZE));
1038 return -EINVAL;
1039 }
1040
1041 ret = vmdk_add_extent(bs, file, false,
1042 le64_to_cpu(header.capacity),
1043 le64_to_cpu(header.gd_offset) << 9,
1044 l1_backup_offset,
1045 l1_size,
1046 le32_to_cpu(header.num_gtes_per_gt),
1047 le64_to_cpu(header.granularity),
1048 &extent,
1049 errp);
1050 if (ret < 0) {
1051 return ret;
1052 }
1053 extent->compressed =
1054 le16_to_cpu(header.compressAlgorithm) == VMDK4_COMPRESSION_DEFLATE;
1055 if (extent->compressed) {
1056 g_free(s->create_type);
1057 s->create_type = g_strdup("streamOptimized");
1058 }
1059 extent->has_marker = le32_to_cpu(header.flags) & VMDK4_FLAG_MARKER;
1060 extent->version = le32_to_cpu(header.version);
1061 extent->has_zero_grain = le32_to_cpu(header.flags) & VMDK4_FLAG_ZERO_GRAIN;
1062 ret = vmdk_init_tables(bs, extent, errp);
1063 if (ret) {
1064 /* free extent allocated by vmdk_add_extent */
1065 vmdk_free_last_extent(bs);
1066 }
1067 return ret;
1068 }
1069
1070 /* find an option value out of descriptor file */
1071 static int vmdk_parse_description(const char *desc, const char *opt_name,
1072 char *buf, int buf_size)
1073 {
1074 char *opt_pos, *opt_end;
1075 const char *end = desc + strlen(desc);
1076
1077 opt_pos = strstr(desc, opt_name);
1078 if (!opt_pos) {
1079 return VMDK_ERROR;
1080 }
1081 /* Skip "=\"" following opt_name */
1082 opt_pos += strlen(opt_name) + 2;
1083 if (opt_pos >= end) {
1084 return VMDK_ERROR;
1085 }
1086 opt_end = opt_pos;
1087 while (opt_end < end && *opt_end != '"') {
1088 opt_end++;
1089 }
1090 if (opt_end == end || buf_size < opt_end - opt_pos + 1) {
1091 return VMDK_ERROR;
1092 }
1093 pstrcpy(buf, opt_end - opt_pos + 1, opt_pos);
1094 return VMDK_OK;
1095 }
1096
1097 /* Open an extent file and append to bs array */
1098 static int vmdk_open_sparse(BlockDriverState *bs, BdrvChild *file, int flags,
1099 char *buf, QDict *options, Error **errp)
1100 {
1101 uint32_t magic;
1102
1103 magic = ldl_be_p(buf);
1104 switch (magic) {
1105 case VMDK3_MAGIC:
1106 return vmdk_open_vmfs_sparse(bs, file, flags, errp);
1107 case VMDK4_MAGIC:
1108 return vmdk_open_vmdk4(bs, file, flags, options, errp);
1109 default:
1110 error_setg(errp, "Image not in VMDK format");
1111 return -EINVAL;
1112 }
1113 }
1114
1115 static const char *next_line(const char *s)
1116 {
1117 while (*s) {
1118 if (*s == '\n') {
1119 return s + 1;
1120 }
1121 s++;
1122 }
1123 return s;
1124 }
1125
1126 static int vmdk_parse_extents(const char *desc, BlockDriverState *bs,
1127 QDict *options, Error **errp)
1128 {
1129 int ret;
1130 int matches;
1131 char access[11];
1132 char type[11];
1133 char fname[512];
1134 const char *p, *np;
1135 int64_t sectors = 0;
1136 int64_t flat_offset;
1137 char *desc_file_dir = NULL;
1138 char *extent_path;
1139 BdrvChild *extent_file;
1140 BdrvChildRole extent_role;
1141 BDRVVmdkState *s = bs->opaque;
1142 VmdkExtent *extent = NULL;
1143 char extent_opt_prefix[32];
1144 Error *local_err = NULL;
1145
1146 for (p = desc; *p; p = next_line(p)) {
1147 /* parse extent line in one of below formats:
1148 *
1149 * RW [size in sectors] FLAT "file-name.vmdk" OFFSET
1150 * RW [size in sectors] SPARSE "file-name.vmdk"
1151 * RW [size in sectors] VMFS "file-name.vmdk"
1152 * RW [size in sectors] VMFSSPARSE "file-name.vmdk"
1153 * RW [size in sectors] SESPARSE "file-name.vmdk"
1154 */
1155 flat_offset = -1;
1156 matches = sscanf(p, "%10s %" SCNd64 " %10s \"%511[^\n\r\"]\" %" SCNd64,
1157 access, &sectors, type, fname, &flat_offset);
1158 if (matches < 4 || strcmp(access, "RW")) {
1159 continue;
1160 } else if (!strcmp(type, "FLAT")) {
1161 if (matches != 5 || flat_offset < 0) {
1162 goto invalid;
1163 }
1164 } else if (!strcmp(type, "VMFS")) {
1165 if (matches == 4) {
1166 flat_offset = 0;
1167 } else {
1168 goto invalid;
1169 }
1170 } else if (matches != 4) {
1171 goto invalid;
1172 }
1173
1174 if (sectors <= 0 ||
1175 (strcmp(type, "FLAT") && strcmp(type, "SPARSE") &&
1176 strcmp(type, "VMFS") && strcmp(type, "VMFSSPARSE") &&
1177 strcmp(type, "SESPARSE")) ||
1178 (strcmp(access, "RW"))) {
1179 continue;
1180 }
1181
1182 if (path_is_absolute(fname)) {
1183 extent_path = g_strdup(fname);
1184 } else {
1185 if (!desc_file_dir) {
1186 desc_file_dir = bdrv_dirname(bs->file->bs, errp);
1187 if (!desc_file_dir) {
1188 bdrv_refresh_filename(bs->file->bs);
1189 error_prepend(errp, "Cannot use relative paths with VMDK "
1190 "descriptor file '%s': ",
1191 bs->file->bs->filename);
1192 ret = -EINVAL;
1193 goto out;
1194 }
1195 }
1196
1197 extent_path = g_strconcat(desc_file_dir, fname, NULL);
1198 }
1199
1200 ret = snprintf(extent_opt_prefix, 32, "extents.%d", s->num_extents);
1201 assert(ret < 32);
1202
1203 extent_role = BDRV_CHILD_DATA;
1204 if (strcmp(type, "FLAT") != 0 && strcmp(type, "VMFS") != 0) {
1205 /* non-flat extents have metadata */
1206 extent_role |= BDRV_CHILD_METADATA;
1207 }
1208
1209 extent_file = bdrv_open_child(extent_path, options, extent_opt_prefix,
1210 bs, &child_of_bds, extent_role, false,
1211 &local_err);
1212 g_free(extent_path);
1213 if (!extent_file) {
1214 error_propagate(errp, local_err);
1215 ret = -EINVAL;
1216 goto out;
1217 }
1218
1219 /* save to extents array */
1220 if (!strcmp(type, "FLAT") || !strcmp(type, "VMFS")) {
1221 /* FLAT extent */
1222
1223 ret = vmdk_add_extent(bs, extent_file, true, sectors,
1224 0, 0, 0, 0, 0, &extent, errp);
1225 if (ret < 0) {
1226 bdrv_graph_wrlock(NULL);
1227 bdrv_unref_child(bs, extent_file);
1228 bdrv_graph_wrunlock();
1229 goto out;
1230 }
1231 extent->flat_start_offset = flat_offset << 9;
1232 } else if (!strcmp(type, "SPARSE") || !strcmp(type, "VMFSSPARSE")) {
1233 /* SPARSE extent and VMFSSPARSE extent are both "COWD" sparse file*/
1234 char *buf = vmdk_read_desc(extent_file, 0, errp);
1235 if (!buf) {
1236 ret = -EINVAL;
1237 } else {
1238 ret = vmdk_open_sparse(bs, extent_file, bs->open_flags, buf,
1239 options, errp);
1240 }
1241 g_free(buf);
1242 if (ret) {
1243 bdrv_graph_wrlock(NULL);
1244 bdrv_unref_child(bs, extent_file);
1245 bdrv_graph_wrunlock();
1246 goto out;
1247 }
1248 extent = &s->extents[s->num_extents - 1];
1249 } else if (!strcmp(type, "SESPARSE")) {
1250 ret = vmdk_open_se_sparse(bs, extent_file, bs->open_flags, errp);
1251 if (ret) {
1252 bdrv_graph_wrlock(NULL);
1253 bdrv_unref_child(bs, extent_file);
1254 bdrv_graph_wrunlock();
1255 goto out;
1256 }
1257 extent = &s->extents[s->num_extents - 1];
1258 } else {
1259 error_setg(errp, "Unsupported extent type '%s'", type);
1260 bdrv_graph_wrlock(NULL);
1261 bdrv_unref_child(bs, extent_file);
1262 bdrv_graph_wrunlock();
1263 ret = -ENOTSUP;
1264 goto out;
1265 }
1266 extent->type = g_strdup(type);
1267 }
1268
1269 ret = 0;
1270 goto out;
1271
1272 invalid:
1273 np = next_line(p);
1274 assert(np != p);
1275 if (np[-1] == '\n') {
1276 np--;
1277 }
1278 error_setg(errp, "Invalid extent line: %.*s", (int)(np - p), p);
1279 ret = -EINVAL;
1280
1281 out:
1282 g_free(desc_file_dir);
1283 return ret;
1284 }
1285
1286 static int vmdk_open_desc_file(BlockDriverState *bs, int flags, char *buf,
1287 QDict *options, Error **errp)
1288 {
1289 int ret;
1290 char ct[128];
1291 BDRVVmdkState *s = bs->opaque;
1292
1293 if (vmdk_parse_description(buf, "createType", ct, sizeof(ct))) {
1294 error_setg(errp, "invalid VMDK image descriptor");
1295 ret = -EINVAL;
1296 goto exit;
1297 }
1298 if (strcmp(ct, "monolithicFlat") &&
1299 strcmp(ct, "vmfs") &&
1300 strcmp(ct, "vmfsSparse") &&
1301 strcmp(ct, "seSparse") &&
1302 strcmp(ct, "twoGbMaxExtentSparse") &&
1303 strcmp(ct, "twoGbMaxExtentFlat")) {
1304 error_setg(errp, "Unsupported image type '%s'", ct);
1305 ret = -ENOTSUP;
1306 goto exit;
1307 }
1308 s->create_type = g_strdup(ct);
1309 s->desc_offset = 0;
1310 ret = vmdk_parse_extents(buf, bs, options, errp);
1311 exit:
1312 return ret;
1313 }
1314
1315 static int vmdk_open(BlockDriverState *bs, QDict *options, int flags,
1316 Error **errp)
1317 {
1318 char *buf;
1319 int ret;
1320 BDRVVmdkState *s = bs->opaque;
1321 uint32_t magic;
1322
1323 GRAPH_RDLOCK_GUARD_MAINLOOP();
1324
1325 ret = bdrv_open_file_child(NULL, options, "file", bs, errp);
1326 if (ret < 0) {
1327 return ret;
1328 }
1329
1330 buf = vmdk_read_desc(bs->file, 0, errp);
1331 if (!buf) {
1332 return -EINVAL;
1333 }
1334
1335 magic = ldl_be_p(buf);
1336 switch (magic) {
1337 case VMDK3_MAGIC:
1338 case VMDK4_MAGIC:
1339 ret = vmdk_open_sparse(bs, bs->file, flags, buf, options,
1340 errp);
1341 s->desc_offset = 0x200;
1342 break;
1343 default:
1344 /* No data in the descriptor file */
1345 bs->file->role &= ~BDRV_CHILD_DATA;
1346
1347 /* Must succeed because we have given up permissions if anything */
1348 bdrv_child_refresh_perms(bs, bs->file, &error_abort);
1349
1350 ret = vmdk_open_desc_file(bs, flags, buf, options, errp);
1351 break;
1352 }
1353 if (ret) {
1354 goto fail;
1355 }
1356
1357 /* try to open parent images, if exist */
1358 ret = vmdk_parent_open(bs);
1359 if (ret) {
1360 goto fail;
1361 }
1362 ret = vmdk_read_cid(bs, 0, &s->cid);
1363 if (ret) {
1364 goto fail;
1365 }
1366 ret = vmdk_read_cid(bs, 1, &s->parent_cid);
1367 if (ret) {
1368 goto fail;
1369 }
1370 qemu_co_mutex_init(&s->lock);
1371
1372 /* Disable migration when VMDK images are used */
1373 error_setg(&s->migration_blocker, "The vmdk format used by node '%s' "
1374 "does not support live migration",
1375 bdrv_get_device_or_node_name(bs));
1376 ret = migrate_add_blocker(s->migration_blocker, errp);
1377 if (ret < 0) {
1378 error_free(s->migration_blocker);
1379 goto fail;
1380 }
1381
1382 g_free(buf);
1383 return 0;
1384
1385 fail:
1386 g_free(buf);
1387 g_free(s->create_type);
1388 s->create_type = NULL;
1389 vmdk_free_extents(bs);
1390 return ret;
1391 }
1392
1393
1394 static void vmdk_refresh_limits(BlockDriverState *bs, Error **errp)
1395 {
1396 BDRVVmdkState *s = bs->opaque;
1397 int i;
1398
1399 for (i = 0; i < s->num_extents; i++) {
1400 if (!s->extents[i].flat) {
1401 bs->bl.pwrite_zeroes_alignment =
1402 MAX(bs->bl.pwrite_zeroes_alignment,
1403 s->extents[i].cluster_sectors << BDRV_SECTOR_BITS);
1404 }
1405 }
1406 }
1407
1408 /**
1409 * get_whole_cluster
1410 *
1411 * Copy backing file's cluster that covers @sector_num, otherwise write zero,
1412 * to the cluster at @cluster_sector_num. If @zeroed is true, we're overwriting
1413 * a zeroed cluster in the current layer and must not copy data from the
1414 * backing file.
1415 *
1416 * If @skip_start_sector < @skip_end_sector, the relative range
1417 * [@skip_start_sector, @skip_end_sector) is not copied or written, and leave
1418 * it for call to write user data in the request.
1419 */
1420 static int coroutine_fn GRAPH_RDLOCK
1421 get_whole_cluster(BlockDriverState *bs, VmdkExtent *extent,
1422 uint64_t cluster_offset, uint64_t offset,
1423 uint64_t skip_start_bytes, uint64_t skip_end_bytes,
1424 bool zeroed)
1425 {
1426 int ret = VMDK_OK;
1427 int64_t cluster_bytes;
1428 uint8_t *whole_grain;
1429 bool copy_from_backing;
1430
1431 /* For COW, align request sector_num to cluster start */
1432 cluster_bytes = extent->cluster_sectors << BDRV_SECTOR_BITS;
1433 offset = QEMU_ALIGN_DOWN(offset, cluster_bytes);
1434 whole_grain = qemu_blockalign(bs, cluster_bytes);
1435 copy_from_backing = bs->backing && !zeroed;
1436
1437 if (!copy_from_backing) {
1438 memset(whole_grain, 0, skip_start_bytes);
1439 memset(whole_grain + skip_end_bytes, 0, cluster_bytes - skip_end_bytes);
1440 }
1441
1442 assert(skip_end_bytes <= cluster_bytes);
1443 /* we will be here if it's first write on non-exist grain(cluster).
1444 * try to read from parent image, if exist */
1445 if (bs->backing && !vmdk_is_cid_valid(bs)) {
1446 ret = VMDK_ERROR;
1447 goto exit;
1448 }
1449
1450 /* Read backing data before skip range */
1451 if (skip_start_bytes > 0) {
1452 if (copy_from_backing) {
1453 /* qcow2 emits this on bs->file instead of bs->backing */
1454 BLKDBG_CO_EVENT(extent->file, BLKDBG_COW_READ);
1455 ret = bdrv_co_pread(bs->backing, offset, skip_start_bytes,
1456 whole_grain, 0);
1457 if (ret < 0) {
1458 ret = VMDK_ERROR;
1459 goto exit;
1460 }
1461 }
1462 BLKDBG_CO_EVENT(extent->file, BLKDBG_COW_WRITE);
1463 ret = bdrv_co_pwrite(extent->file, cluster_offset, skip_start_bytes,
1464 whole_grain, 0);
1465 if (ret < 0) {
1466 ret = VMDK_ERROR;
1467 goto exit;
1468 }
1469 }
1470 /* Read backing data after skip range */
1471 if (skip_end_bytes < cluster_bytes) {
1472 if (copy_from_backing) {
1473 /* qcow2 emits this on bs->file instead of bs->backing */
1474 BLKDBG_CO_EVENT(extent->file, BLKDBG_COW_READ);
1475 ret = bdrv_co_pread(bs->backing, offset + skip_end_bytes,
1476 cluster_bytes - skip_end_bytes,
1477 whole_grain + skip_end_bytes, 0);
1478 if (ret < 0) {
1479 ret = VMDK_ERROR;
1480 goto exit;
1481 }
1482 }
1483 BLKDBG_CO_EVENT(extent->file, BLKDBG_COW_WRITE);
1484 ret = bdrv_co_pwrite(extent->file, cluster_offset + skip_end_bytes,
1485 cluster_bytes - skip_end_bytes,
1486 whole_grain + skip_end_bytes, 0);
1487 if (ret < 0) {
1488 ret = VMDK_ERROR;
1489 goto exit;
1490 }
1491 }
1492
1493 ret = VMDK_OK;
1494 exit:
1495 qemu_vfree(whole_grain);
1496 return ret;
1497 }
1498
1499 static int coroutine_fn GRAPH_RDLOCK
1500 vmdk_L2update(VmdkExtent *extent, VmdkMetaData *m_data, uint32_t offset)
1501 {
1502 offset = cpu_to_le32(offset);
1503 /* update L2 table */
1504 BLKDBG_CO_EVENT(extent->file, BLKDBG_L2_UPDATE);
1505 if (bdrv_co_pwrite(extent->file,
1506 ((int64_t)m_data->l2_offset * 512)
1507 + (m_data->l2_index * sizeof(offset)),
1508 sizeof(offset), &offset, 0) < 0) {
1509 return VMDK_ERROR;
1510 }
1511 /* update backup L2 table */
1512 if (extent->l1_backup_table_offset != 0) {
1513 m_data->l2_offset = extent->l1_backup_table[m_data->l1_index];
1514 if (bdrv_co_pwrite(extent->file,
1515 ((int64_t)m_data->l2_offset * 512)
1516 + (m_data->l2_index * sizeof(offset)),
1517 sizeof(offset), &offset, 0) < 0) {
1518 return VMDK_ERROR;
1519 }
1520 }
1521 if (bdrv_co_flush(extent->file->bs) < 0) {
1522 return VMDK_ERROR;
1523 }
1524 if (m_data->l2_cache_entry) {
1525 *m_data->l2_cache_entry = offset;
1526 }
1527
1528 return VMDK_OK;
1529 }
1530
1531 /**
1532 * get_cluster_offset
1533 *
1534 * Look up cluster offset in extent file by sector number, and store in
1535 * @cluster_offset.
1536 *
1537 * For flat extents, the start offset as parsed from the description file is
1538 * returned.
1539 *
1540 * For sparse extents, look up in L1, L2 table. If allocate is true, return an
1541 * offset for a new cluster and update L2 cache. If there is a backing file,
1542 * COW is done before returning; otherwise, zeroes are written to the allocated
1543 * cluster. Both COW and zero writing skips the sector range
1544 * [@skip_start_sector, @skip_end_sector) passed in by caller, because caller
1545 * has new data to write there.
1546 *
1547 * Returns: VMDK_OK if cluster exists and mapped in the image.
1548 * VMDK_UNALLOC if cluster is not mapped and @allocate is false.
1549 * VMDK_ERROR if failed.
1550 */
1551 static int coroutine_fn GRAPH_RDLOCK
1552 get_cluster_offset(BlockDriverState *bs, VmdkExtent *extent,
1553 VmdkMetaData *m_data, uint64_t offset, bool allocate,
1554 uint64_t *cluster_offset, uint64_t skip_start_bytes,
1555 uint64_t skip_end_bytes)
1556 {
1557 unsigned int l1_index, l2_offset, l2_index;
1558 int min_index, i, j;
1559 uint32_t min_count;
1560 void *l2_table;
1561 bool zeroed = false;
1562 int64_t ret;
1563 int64_t cluster_sector;
1564 unsigned int l2_size_bytes = extent->l2_size * extent->entry_size;
1565
1566 if (m_data) {
1567 m_data->new_allocation = false;
1568 }
1569 if (extent->flat) {
1570 *cluster_offset = extent->flat_start_offset;
1571 return VMDK_OK;
1572 }
1573
1574 offset -= (extent->end_sector - extent->sectors) * SECTOR_SIZE;
1575 l1_index = (offset >> 9) / extent->l1_entry_sectors;
1576 if (l1_index >= extent->l1_size) {
1577 return VMDK_ERROR;
1578 }
1579 if (extent->sesparse) {
1580 uint64_t l2_offset_u64;
1581
1582 assert(extent->entry_size == sizeof(uint64_t));
1583
1584 l2_offset_u64 = ((uint64_t *)extent->l1_table)[l1_index];
1585 if (l2_offset_u64 == 0) {
1586 l2_offset = 0;
1587 } else if ((l2_offset_u64 & 0xffffffff00000000) != 0x1000000000000000) {
1588 /*
1589 * Top most nibble is 0x1 if grain table is allocated.
1590 * strict check - top most 4 bytes must be 0x10000000 since max
1591 * supported size is 64TB for disk - so no more than 64TB / 16MB
1592 * grain directories which is smaller than uint32,
1593 * where 16MB is the only supported default grain table coverage.
1594 */
1595 return VMDK_ERROR;
1596 } else {
1597 l2_offset_u64 = l2_offset_u64 & 0x00000000ffffffff;
1598 l2_offset_u64 = extent->sesparse_l2_tables_offset +
1599 l2_offset_u64 * l2_size_bytes / SECTOR_SIZE;
1600 if (l2_offset_u64 > 0x00000000ffffffff) {
1601 return VMDK_ERROR;
1602 }
1603 l2_offset = (unsigned int)(l2_offset_u64);
1604 }
1605 } else {
1606 assert(extent->entry_size == sizeof(uint32_t));
1607 l2_offset = ((uint32_t *)extent->l1_table)[l1_index];
1608 }
1609 if (!l2_offset) {
1610 return VMDK_UNALLOC;
1611 }
1612 for (i = 0; i < L2_CACHE_SIZE; i++) {
1613 if (l2_offset == extent->l2_cache_offsets[i]) {
1614 /* increment the hit count */
1615 if (++extent->l2_cache_counts[i] == 0xffffffff) {
1616 for (j = 0; j < L2_CACHE_SIZE; j++) {
1617 extent->l2_cache_counts[j] >>= 1;
1618 }
1619 }
1620 l2_table = (char *)extent->l2_cache + (i * l2_size_bytes);
1621 goto found;
1622 }
1623 }
1624 /* not found: load a new entry in the least used one */
1625 min_index = 0;
1626 min_count = 0xffffffff;
1627 for (i = 0; i < L2_CACHE_SIZE; i++) {
1628 if (extent->l2_cache_counts[i] < min_count) {
1629 min_count = extent->l2_cache_counts[i];
1630 min_index = i;
1631 }
1632 }
1633 l2_table = (char *)extent->l2_cache + (min_index * l2_size_bytes);
1634 BLKDBG_CO_EVENT(extent->file, BLKDBG_L2_LOAD);
1635 if (bdrv_co_pread(extent->file,
1636 (int64_t)l2_offset * 512,
1637 l2_size_bytes,
1638 l2_table, 0
1639 ) < 0) {
1640 return VMDK_ERROR;
1641 }
1642
1643 extent->l2_cache_offsets[min_index] = l2_offset;
1644 extent->l2_cache_counts[min_index] = 1;
1645 found:
1646 l2_index = ((offset >> 9) / extent->cluster_sectors) % extent->l2_size;
1647 if (m_data) {
1648 m_data->l1_index = l1_index;
1649 m_data->l2_index = l2_index;
1650 m_data->l2_offset = l2_offset;
1651 m_data->l2_cache_entry = ((uint32_t *)l2_table) + l2_index;
1652 }
1653
1654 if (extent->sesparse) {
1655 cluster_sector = le64_to_cpu(((uint64_t *)l2_table)[l2_index]);
1656 switch (cluster_sector & 0xf000000000000000) {
1657 case 0x0000000000000000:
1658 /* unallocated grain */
1659 if (cluster_sector != 0) {
1660 return VMDK_ERROR;
1661 }
1662 break;
1663 case 0x1000000000000000:
1664 /* scsi-unmapped grain - fallthrough */
1665 case 0x2000000000000000:
1666 /* zero grain */
1667 zeroed = true;
1668 break;
1669 case 0x3000000000000000:
1670 /* allocated grain */
1671 cluster_sector = (((cluster_sector & 0x0fff000000000000) >> 48) |
1672 ((cluster_sector & 0x0000ffffffffffff) << 12));
1673 cluster_sector = extent->sesparse_clusters_offset +
1674 cluster_sector * extent->cluster_sectors;
1675 break;
1676 default:
1677 return VMDK_ERROR;
1678 }
1679 } else {
1680 cluster_sector = le32_to_cpu(((uint32_t *)l2_table)[l2_index]);
1681
1682 if (extent->has_zero_grain && cluster_sector == VMDK_GTE_ZEROED) {
1683 zeroed = true;
1684 }
1685 }
1686
1687 if (!cluster_sector || zeroed) {
1688 if (!allocate) {
1689 return zeroed ? VMDK_ZEROED : VMDK_UNALLOC;
1690 }
1691 assert(!extent->sesparse);
1692
1693 if (extent->next_cluster_sector >= VMDK_EXTENT_MAX_SECTORS) {
1694 return VMDK_ERROR;
1695 }
1696
1697 cluster_sector = extent->next_cluster_sector;
1698 extent->next_cluster_sector += extent->cluster_sectors;
1699
1700 /* First of all we write grain itself, to avoid race condition
1701 * that may to corrupt the image.
1702 * This problem may occur because of insufficient space on host disk
1703 * or inappropriate VM shutdown.
1704 */
1705 ret = get_whole_cluster(bs, extent, cluster_sector * BDRV_SECTOR_SIZE,
1706 offset, skip_start_bytes, skip_end_bytes,
1707 zeroed);
1708 if (ret) {
1709 return ret;
1710 }
1711 if (m_data) {
1712 m_data->new_allocation = true;
1713 }
1714 }
1715 *cluster_offset = cluster_sector << BDRV_SECTOR_BITS;
1716 return VMDK_OK;
1717 }
1718
1719 static VmdkExtent *find_extent(BDRVVmdkState *s,
1720 int64_t sector_num, VmdkExtent *start_hint)
1721 {
1722 VmdkExtent *extent = start_hint;
1723
1724 if (!extent) {
1725 extent = &s->extents[0];
1726 }
1727 while (extent < &s->extents[s->num_extents]) {
1728 if (sector_num < extent->end_sector) {
1729 return extent;
1730 }
1731 extent++;
1732 }
1733 return NULL;
1734 }
1735
1736 static inline uint64_t vmdk_find_offset_in_cluster(VmdkExtent *extent,
1737 int64_t offset)
1738 {
1739 uint64_t extent_begin_offset, extent_relative_offset;
1740 uint64_t cluster_size = extent->cluster_sectors * BDRV_SECTOR_SIZE;
1741
1742 extent_begin_offset =
1743 (extent->end_sector - extent->sectors) * BDRV_SECTOR_SIZE;
1744 extent_relative_offset = offset - extent_begin_offset;
1745 return extent_relative_offset % cluster_size;
1746 }
1747
1748 static int coroutine_fn GRAPH_RDLOCK
1749 vmdk_co_block_status(BlockDriverState *bs, bool want_zero,
1750 int64_t offset, int64_t bytes, int64_t *pnum,
1751 int64_t *map, 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 } else {
1787 ret |= BDRV_BLOCK_COMPRESSED;
1788 }
1789 *file = extent->file->bs;
1790 break;
1791 }
1792
1793 n = extent->cluster_sectors * BDRV_SECTOR_SIZE - index_in_cluster;
1794 *pnum = MIN(n, bytes);
1795 return ret;
1796 }
1797
1798 static int coroutine_fn GRAPH_RDLOCK
1799 vmdk_write_extent(VmdkExtent *extent, int64_t cluster_offset,
1800 int64_t offset_in_cluster, QEMUIOVector *qiov,
1801 uint64_t qiov_offset, uint64_t n_bytes,
1802 uint64_t offset)
1803 {
1804 int ret;
1805 VmdkGrainMarker *data = NULL;
1806 uLongf buf_len;
1807 QEMUIOVector local_qiov;
1808 int64_t write_offset;
1809 int64_t write_end_sector;
1810
1811 if (extent->compressed) {
1812 void *compressed_data;
1813
1814 /* Only whole clusters */
1815 if (offset_in_cluster ||
1816 n_bytes > (extent->cluster_sectors * SECTOR_SIZE) ||
1817 (n_bytes < (extent->cluster_sectors * SECTOR_SIZE) &&
1818 offset + n_bytes != extent->end_sector * SECTOR_SIZE))
1819 {
1820 ret = -EINVAL;
1821 goto out;
1822 }
1823
1824 if (!extent->has_marker) {
1825 ret = -EINVAL;
1826 goto out;
1827 }
1828 buf_len = (extent->cluster_sectors << 9) * 2;
1829 data = g_malloc(buf_len + sizeof(VmdkGrainMarker));
1830
1831 compressed_data = g_malloc(n_bytes);
1832 qemu_iovec_to_buf(qiov, qiov_offset, compressed_data, n_bytes);
1833 ret = compress(data->data, &buf_len, compressed_data, n_bytes);
1834 g_free(compressed_data);
1835
1836 if (ret != Z_OK || buf_len == 0) {
1837 ret = -EINVAL;
1838 goto out;
1839 }
1840
1841 data->lba = cpu_to_le64(offset >> BDRV_SECTOR_BITS);
1842 data->size = cpu_to_le32(buf_len);
1843
1844 n_bytes = buf_len + sizeof(VmdkGrainMarker);
1845 qemu_iovec_init_buf(&local_qiov, data, n_bytes);
1846
1847 BLKDBG_CO_EVENT(extent->file, BLKDBG_WRITE_COMPRESSED);
1848 } else {
1849 qemu_iovec_init(&local_qiov, qiov->niov);
1850 qemu_iovec_concat(&local_qiov, qiov, qiov_offset, n_bytes);
1851
1852 BLKDBG_CO_EVENT(extent->file, BLKDBG_WRITE_AIO);
1853 }
1854
1855 write_offset = cluster_offset + offset_in_cluster;
1856 ret = bdrv_co_pwritev(extent->file, write_offset, n_bytes,
1857 &local_qiov, 0);
1858
1859 write_end_sector = DIV_ROUND_UP(write_offset + n_bytes, BDRV_SECTOR_SIZE);
1860
1861 if (extent->compressed) {
1862 extent->next_cluster_sector = write_end_sector;
1863 } else {
1864 extent->next_cluster_sector = MAX(extent->next_cluster_sector,
1865 write_end_sector);
1866 }
1867
1868 if (ret < 0) {
1869 goto out;
1870 }
1871 ret = 0;
1872 out:
1873 g_free(data);
1874 if (!extent->compressed) {
1875 qemu_iovec_destroy(&local_qiov);
1876 }
1877 return ret;
1878 }
1879
1880 static int coroutine_fn GRAPH_RDLOCK
1881 vmdk_read_extent(VmdkExtent *extent, int64_t cluster_offset,
1882 int64_t offset_in_cluster, QEMUIOVector *qiov, int bytes)
1883 {
1884 int ret;
1885 int cluster_bytes, buf_bytes;
1886 uint8_t *cluster_buf, *compressed_data;
1887 uint8_t *uncomp_buf;
1888 uint32_t data_len;
1889 VmdkGrainMarker *marker;
1890 uLongf buf_len;
1891
1892
1893 if (!extent->compressed) {
1894 BLKDBG_CO_EVENT(extent->file, BLKDBG_READ_AIO);
1895 ret = bdrv_co_preadv(extent->file,
1896 cluster_offset + offset_in_cluster, bytes,
1897 qiov, 0);
1898 if (ret < 0) {
1899 return ret;
1900 }
1901 return 0;
1902 }
1903 cluster_bytes = extent->cluster_sectors * 512;
1904 /* Read two clusters in case GrainMarker + compressed data > one cluster */
1905 buf_bytes = cluster_bytes * 2;
1906 cluster_buf = g_malloc(buf_bytes);
1907 uncomp_buf = g_malloc(cluster_bytes);
1908 BLKDBG_CO_EVENT(extent->file, BLKDBG_READ_COMPRESSED);
1909 ret = bdrv_co_pread(extent->file, cluster_offset, buf_bytes, cluster_buf,
1910 0);
1911 if (ret < 0) {
1912 goto out;
1913 }
1914 compressed_data = cluster_buf;
1915 buf_len = cluster_bytes;
1916 data_len = cluster_bytes;
1917 if (extent->has_marker) {
1918 marker = (VmdkGrainMarker *)cluster_buf;
1919 compressed_data = marker->data;
1920 data_len = le32_to_cpu(marker->size);
1921 }
1922 if (!data_len || data_len > buf_bytes) {
1923 ret = -EINVAL;
1924 goto out;
1925 }
1926 ret = uncompress(uncomp_buf, &buf_len, compressed_data, data_len);
1927 if (ret != Z_OK) {
1928 ret = -EINVAL;
1929 goto out;
1930
1931 }
1932 if (offset_in_cluster < 0 ||
1933 offset_in_cluster + bytes > buf_len) {
1934 ret = -EINVAL;
1935 goto out;
1936 }
1937 qemu_iovec_from_buf(qiov, 0, uncomp_buf + offset_in_cluster, bytes);
1938 ret = 0;
1939
1940 out:
1941 g_free(uncomp_buf);
1942 g_free(cluster_buf);
1943 return ret;
1944 }
1945
1946 static int coroutine_fn GRAPH_RDLOCK
1947 vmdk_co_preadv(BlockDriverState *bs, int64_t offset, int64_t bytes,
1948 QEMUIOVector *qiov, BdrvRequestFlags flags)
1949 {
1950 BDRVVmdkState *s = bs->opaque;
1951 int ret;
1952 uint64_t n_bytes, offset_in_cluster;
1953 VmdkExtent *extent = NULL;
1954 QEMUIOVector local_qiov;
1955 uint64_t cluster_offset;
1956 uint64_t bytes_done = 0;
1957
1958 qemu_iovec_init(&local_qiov, qiov->niov);
1959 qemu_co_mutex_lock(&s->lock);
1960
1961 while (bytes > 0) {
1962 extent = find_extent(s, offset >> BDRV_SECTOR_BITS, extent);
1963 if (!extent) {
1964 ret = -EIO;
1965 goto fail;
1966 }
1967 ret = get_cluster_offset(bs, extent, NULL,
1968 offset, false, &cluster_offset, 0, 0);
1969 offset_in_cluster = vmdk_find_offset_in_cluster(extent, offset);
1970
1971 n_bytes = MIN(bytes, extent->cluster_sectors * BDRV_SECTOR_SIZE
1972 - offset_in_cluster);
1973
1974 if (ret != VMDK_OK) {
1975 /* if not allocated, try to read from parent image, if exist */
1976 if (bs->backing && ret != VMDK_ZEROED) {
1977 if (!vmdk_is_cid_valid(bs)) {
1978 ret = -EINVAL;
1979 goto fail;
1980 }
1981
1982 qemu_iovec_reset(&local_qiov);
1983 qemu_iovec_concat(&local_qiov, qiov, bytes_done, n_bytes);
1984
1985 /* qcow2 emits this on bs->file instead of bs->backing */
1986 BLKDBG_CO_EVENT(bs->file, BLKDBG_READ_BACKING_AIO);
1987 ret = bdrv_co_preadv(bs->backing, offset, n_bytes,
1988 &local_qiov, 0);
1989 if (ret < 0) {
1990 goto fail;
1991 }
1992 } else {
1993 qemu_iovec_memset(qiov, bytes_done, 0, n_bytes);
1994 }
1995 } else {
1996 qemu_iovec_reset(&local_qiov);
1997 qemu_iovec_concat(&local_qiov, qiov, bytes_done, n_bytes);
1998
1999 ret = vmdk_read_extent(extent, cluster_offset, offset_in_cluster,
2000 &local_qiov, n_bytes);
2001 if (ret) {
2002 goto fail;
2003 }
2004 }
2005 bytes -= n_bytes;
2006 offset += n_bytes;
2007 bytes_done += n_bytes;
2008 }
2009
2010 ret = 0;
2011 fail:
2012 qemu_co_mutex_unlock(&s->lock);
2013 qemu_iovec_destroy(&local_qiov);
2014
2015 return ret;
2016 }
2017
2018 /**
2019 * vmdk_write:
2020 * @zeroed: buf is ignored (data is zero), use zeroed_grain GTE feature
2021 * if possible, otherwise return -ENOTSUP.
2022 * @zero_dry_run: used for zeroed == true only, don't update L2 table, just try
2023 * with each cluster. By dry run we can find if the zero write
2024 * is possible without modifying image data.
2025 *
2026 * Returns: error code with 0 for success.
2027 */
2028 static int coroutine_fn GRAPH_RDLOCK
2029 vmdk_pwritev(BlockDriverState *bs, uint64_t offset, uint64_t bytes,
2030 QEMUIOVector *qiov, bool zeroed, bool zero_dry_run)
2031 {
2032 BDRVVmdkState *s = bs->opaque;
2033 VmdkExtent *extent = NULL;
2034 int ret;
2035 int64_t offset_in_cluster, n_bytes;
2036 uint64_t cluster_offset;
2037 uint64_t bytes_done = 0;
2038 VmdkMetaData m_data;
2039
2040 if (DIV_ROUND_UP(offset, BDRV_SECTOR_SIZE) > bs->total_sectors) {
2041 error_report("Wrong offset: offset=0x%" PRIx64
2042 " total_sectors=0x%" PRIx64,
2043 offset, bs->total_sectors);
2044 return -EIO;
2045 }
2046
2047 while (bytes > 0) {
2048 extent = find_extent(s, offset >> BDRV_SECTOR_BITS, extent);
2049 if (!extent) {
2050 return -EIO;
2051 }
2052 if (extent->sesparse) {
2053 return -ENOTSUP;
2054 }
2055 offset_in_cluster = vmdk_find_offset_in_cluster(extent, offset);
2056 n_bytes = MIN(bytes, extent->cluster_sectors * BDRV_SECTOR_SIZE
2057 - offset_in_cluster);
2058
2059 ret = get_cluster_offset(bs, extent, &m_data, offset,
2060 !(extent->compressed || zeroed),
2061 &cluster_offset, offset_in_cluster,
2062 offset_in_cluster + n_bytes);
2063 if (extent->compressed) {
2064 if (ret == VMDK_OK) {
2065 /* Refuse write to allocated cluster for streamOptimized */
2066 error_report("Could not write to allocated cluster"
2067 " for streamOptimized");
2068 return -EIO;
2069 } else if (!zeroed) {
2070 /* allocate */
2071 ret = get_cluster_offset(bs, extent, &m_data, offset,
2072 true, &cluster_offset, 0, 0);
2073 }
2074 }
2075 if (ret == VMDK_ERROR) {
2076 return -EINVAL;
2077 }
2078 if (zeroed) {
2079 /* Do zeroed write, buf is ignored */
2080 if (extent->has_zero_grain &&
2081 offset_in_cluster == 0 &&
2082 n_bytes >= extent->cluster_sectors * BDRV_SECTOR_SIZE) {
2083 n_bytes = extent->cluster_sectors * BDRV_SECTOR_SIZE;
2084 if (!zero_dry_run && ret != VMDK_ZEROED) {
2085 /* update L2 tables */
2086 if (vmdk_L2update(extent, &m_data, VMDK_GTE_ZEROED)
2087 != VMDK_OK) {
2088 return -EIO;
2089 }
2090 }
2091 } else {
2092 return -ENOTSUP;
2093 }
2094 } else {
2095 ret = vmdk_write_extent(extent, cluster_offset, offset_in_cluster,
2096 qiov, bytes_done, n_bytes, offset);
2097 if (ret) {
2098 return ret;
2099 }
2100 if (m_data.new_allocation) {
2101 /* update L2 tables */
2102 if (vmdk_L2update(extent, &m_data,
2103 cluster_offset >> BDRV_SECTOR_BITS)
2104 != VMDK_OK) {
2105 return -EIO;
2106 }
2107 }
2108 }
2109 bytes -= n_bytes;
2110 offset += n_bytes;
2111 bytes_done += n_bytes;
2112
2113 /* update CID on the first write every time the virtual disk is
2114 * opened */
2115 if (!s->cid_updated) {
2116 ret = vmdk_write_cid(bs, g_random_int());
2117 if (ret < 0) {
2118 return ret;
2119 }
2120 s->cid_updated = true;
2121 }
2122 }
2123 return 0;
2124 }
2125
2126 static int coroutine_fn GRAPH_RDLOCK
2127 vmdk_co_pwritev(BlockDriverState *bs, int64_t offset, int64_t bytes,
2128 QEMUIOVector *qiov, BdrvRequestFlags flags)
2129 {
2130 int ret;
2131 BDRVVmdkState *s = bs->opaque;
2132 qemu_co_mutex_lock(&s->lock);
2133 ret = vmdk_pwritev(bs, offset, bytes, qiov, false, false);
2134 qemu_co_mutex_unlock(&s->lock);
2135 return ret;
2136 }
2137
2138 static int coroutine_fn GRAPH_RDLOCK
2139 vmdk_co_pwritev_compressed(BlockDriverState *bs, int64_t offset, int64_t bytes,
2140 QEMUIOVector *qiov)
2141 {
2142 if (bytes == 0) {
2143 /* The caller will write bytes 0 to signal EOF.
2144 * When receive it, we align EOF to a sector boundary. */
2145 BDRVVmdkState *s = bs->opaque;
2146 int i, ret;
2147 int64_t length;
2148
2149 for (i = 0; i < s->num_extents; i++) {
2150 length = bdrv_co_getlength(s->extents[i].file->bs);
2151 if (length < 0) {
2152 return length;
2153 }
2154 length = QEMU_ALIGN_UP(length, BDRV_SECTOR_SIZE);
2155 ret = bdrv_co_truncate(s->extents[i].file, length, false,
2156 PREALLOC_MODE_OFF, 0, NULL);
2157 if (ret < 0) {
2158 return ret;
2159 }
2160 }
2161 return 0;
2162 }
2163 return vmdk_co_pwritev(bs, offset, bytes, qiov, 0);
2164 }
2165
2166 static int coroutine_fn GRAPH_RDLOCK
2167 vmdk_co_pwrite_zeroes(BlockDriverState *bs, int64_t offset, int64_t bytes,
2168 BdrvRequestFlags flags)
2169 {
2170 int ret;
2171 BDRVVmdkState *s = bs->opaque;
2172
2173 qemu_co_mutex_lock(&s->lock);
2174 /* write zeroes could fail if sectors not aligned to cluster, test it with
2175 * dry_run == true before really updating image */
2176 ret = vmdk_pwritev(bs, offset, bytes, NULL, true, true);
2177 if (!ret) {
2178 ret = vmdk_pwritev(bs, offset, bytes, NULL, true, false);
2179 }
2180 qemu_co_mutex_unlock(&s->lock);
2181 return ret;
2182 }
2183
2184 static int coroutine_fn GRAPH_UNLOCKED
2185 vmdk_init_extent(BlockBackend *blk, int64_t filesize, bool flat, bool compress,
2186 bool zeroed_grain, 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_co_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_co_pwrite(blk, 0, sizeof(magic), &magic, 0);
2248 if (ret < 0) {
2249 error_setg(errp, QERR_IO_ERROR);
2250 goto exit;
2251 }
2252 ret = blk_co_pwrite(blk, sizeof(magic), sizeof(header), &header, 0);
2253 if (ret < 0) {
2254 error_setg(errp, QERR_IO_ERROR);
2255 goto exit;
2256 }
2257
2258 ret = blk_co_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_co_pwrite(blk, le64_to_cpu(header.rgd_offset) * BDRV_SECTOR_SIZE,
2272 gd_buf_size, gd_buf, 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_co_pwrite(blk, le64_to_cpu(header.gd_offset) * BDRV_SECTOR_SIZE,
2284 gd_buf_size, gd_buf, 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 coroutine_fn GRAPH_UNLOCKED
2296 vmdk_create_extent(const char *filename, int64_t filesize, bool flat,
2297 bool compress, bool zeroed_grain, BlockBackend **pbb,
2298 QemuOpts *opts, Error **errp)
2299 {
2300 int ret;
2301 BlockBackend *blk = NULL;
2302
2303 ret = bdrv_co_create_file(filename, opts, errp);
2304 if (ret < 0) {
2305 goto exit;
2306 }
2307
2308 blk = blk_co_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_co_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 * coroutine_fn GRAPH_UNLOCKED_PTR
2377 (*vmdk_create_extent_fn)(int64_t size, int idx, bool flat, bool split,
2378 bool compress, bool zeroed_grain, void *opaque,
2379 Error **errp);
2380
2381 static void vmdk_desc_add_extent(GString *desc,
2382 const char *extent_line_fmt,
2383 int64_t size, const char *filename)
2384 {
2385 char *basename = g_path_get_basename(filename);
2386
2387 g_string_append_printf(desc, extent_line_fmt,
2388 DIV_ROUND_UP(size, BDRV_SECTOR_SIZE), basename);
2389 g_free(basename);
2390 }
2391
2392 static int coroutine_fn GRAPH_UNLOCKED
2393 vmdk_co_do_create(int64_t size,
2394 BlockdevVmdkSubformat subformat,
2395 BlockdevVmdkAdapterType adapter_type,
2396 const char *backing_file,
2397 const char *hw_version,
2398 const char *toolsversion,
2399 bool compat6,
2400 bool zeroed_grain,
2401 vmdk_create_extent_fn extent_fn,
2402 void *opaque,
2403 Error **errp)
2404 {
2405 int extent_idx;
2406 BlockBackend *blk = NULL;
2407 BlockBackend *extent_blk;
2408 Error *local_err = NULL;
2409 char *desc = NULL;
2410 int ret = 0;
2411 bool flat, split, compress;
2412 GString *ext_desc_lines;
2413 const int64_t split_size = 0x80000000; /* VMDK has constant split size */
2414 int64_t extent_size;
2415 int64_t created_size = 0;
2416 const char *extent_line_fmt;
2417 char *parent_desc_line = g_malloc0(BUF_SIZE);
2418 uint32_t parent_cid = 0xffffffff;
2419 uint32_t number_heads = 16;
2420 uint32_t desc_offset = 0, desc_len;
2421 const char desc_template[] =
2422 "# Disk DescriptorFile\n"
2423 "version=1\n"
2424 "CID=%" PRIx32 "\n"
2425 "parentCID=%" PRIx32 "\n"
2426 "createType=\"%s\"\n"
2427 "%s"
2428 "\n"
2429 "# Extent description\n"
2430 "%s"
2431 "\n"
2432 "# The Disk Data Base\n"
2433 "#DDB\n"
2434 "\n"
2435 "ddb.virtualHWVersion = \"%s\"\n"
2436 "ddb.geometry.cylinders = \"%" PRId64 "\"\n"
2437 "ddb.geometry.heads = \"%" PRIu32 "\"\n"
2438 "ddb.geometry.sectors = \"63\"\n"
2439 "ddb.adapterType = \"%s\"\n"
2440 "ddb.toolsVersion = \"%s\"\n";
2441
2442 ext_desc_lines = g_string_new(NULL);
2443
2444 /* Read out options */
2445 if (compat6) {
2446 if (hw_version) {
2447 error_setg(errp,
2448 "compat6 cannot be enabled with hwversion set");
2449 ret = -EINVAL;
2450 goto exit;
2451 }
2452 hw_version = "6";
2453 }
2454 if (!hw_version) {
2455 hw_version = "4";
2456 }
2457 if (!toolsversion) {
2458 toolsversion = "2147483647";
2459 }
2460
2461 if (adapter_type != BLOCKDEV_VMDK_ADAPTER_TYPE_IDE) {
2462 /* that's the number of heads with which vmware operates when
2463 creating, exporting, etc. vmdk files with a non-ide adapter type */
2464 number_heads = 255;
2465 }
2466 split = (subformat == BLOCKDEV_VMDK_SUBFORMAT_TWOGBMAXEXTENTFLAT) ||
2467 (subformat == BLOCKDEV_VMDK_SUBFORMAT_TWOGBMAXEXTENTSPARSE);
2468 flat = (subformat == BLOCKDEV_VMDK_SUBFORMAT_MONOLITHICFLAT) ||
2469 (subformat == BLOCKDEV_VMDK_SUBFORMAT_TWOGBMAXEXTENTFLAT);
2470 compress = subformat == BLOCKDEV_VMDK_SUBFORMAT_STREAMOPTIMIZED;
2471
2472 if (flat) {
2473 extent_line_fmt = "RW %" PRId64 " FLAT \"%s\" 0\n";
2474 } else {
2475 extent_line_fmt = "RW %" PRId64 " SPARSE \"%s\"\n";
2476 }
2477 if (flat && backing_file) {
2478 error_setg(errp, "Flat image can't have backing file");
2479 ret = -ENOTSUP;
2480 goto exit;
2481 }
2482 if (flat && zeroed_grain) {
2483 error_setg(errp, "Flat image can't enable zeroed grain");
2484 ret = -ENOTSUP;
2485 goto exit;
2486 }
2487
2488 /* Create extents */
2489 if (split) {
2490 extent_size = split_size;
2491 } else {
2492 extent_size = size;
2493 }
2494 if (!split && !flat) {
2495 created_size = extent_size;
2496 } else {
2497 created_size = 0;
2498 }
2499 /* Get the descriptor file BDS */
2500 blk = extent_fn(created_size, 0, flat, split, compress, zeroed_grain,
2501 opaque, errp);
2502 if (!blk) {
2503 ret = -EIO;
2504 goto exit;
2505 }
2506 if (!split && !flat) {
2507 vmdk_desc_add_extent(ext_desc_lines, extent_line_fmt, created_size,
2508 blk_bs(blk)->filename);
2509 }
2510
2511 if (backing_file) {
2512 BlockBackend *backing;
2513 char *full_backing =
2514 bdrv_get_full_backing_filename_from_filename(blk_bs(blk)->filename,
2515 backing_file,
2516 &local_err);
2517 if (local_err) {
2518 error_propagate(errp, local_err);
2519 ret = -ENOENT;
2520 goto exit;
2521 }
2522 assert(full_backing);
2523
2524 backing = blk_co_new_open(full_backing, NULL, NULL,
2525 BDRV_O_NO_BACKING, errp);
2526 g_free(full_backing);
2527 if (backing == NULL) {
2528 ret = -EIO;
2529 goto exit;
2530 }
2531 if (strcmp(blk_bs(backing)->drv->format_name, "vmdk")) {
2532 error_setg(errp, "Invalid backing file format: %s. Must be vmdk",
2533 blk_bs(backing)->drv->format_name);
2534 blk_co_unref(backing);
2535 ret = -EINVAL;
2536 goto exit;
2537 }
2538 ret = vmdk_read_cid(blk_bs(backing), 0, &parent_cid);
2539 blk_co_unref(backing);
2540 if (ret) {
2541 error_setg(errp, "Failed to read parent CID");
2542 goto exit;
2543 }
2544 snprintf(parent_desc_line, BUF_SIZE,
2545 "parentFileNameHint=\"%s\"", backing_file);
2546 }
2547 extent_idx = 1;
2548 while (created_size < size) {
2549 int64_t cur_size = MIN(size - created_size, extent_size);
2550 extent_blk = extent_fn(cur_size, extent_idx, flat, split, compress,
2551 zeroed_grain, opaque, errp);
2552 if (!extent_blk) {
2553 ret = -EINVAL;
2554 goto exit;
2555 }
2556 vmdk_desc_add_extent(ext_desc_lines, extent_line_fmt, cur_size,
2557 blk_bs(extent_blk)->filename);
2558 created_size += cur_size;
2559 extent_idx++;
2560 blk_co_unref(extent_blk);
2561 }
2562
2563 /* Check whether we got excess extents */
2564 extent_blk = extent_fn(-1, extent_idx, flat, split, compress, zeroed_grain,
2565 opaque, NULL);
2566 if (extent_blk) {
2567 blk_co_unref(extent_blk);
2568 error_setg(errp, "List of extents contains unused extents");
2569 ret = -EINVAL;
2570 goto exit;
2571 }
2572
2573 /* generate descriptor file */
2574 desc = g_strdup_printf(desc_template,
2575 g_random_int(),
2576 parent_cid,
2577 BlockdevVmdkSubformat_str(subformat),
2578 parent_desc_line,
2579 ext_desc_lines->str,
2580 hw_version,
2581 size /
2582 (int64_t)(63 * number_heads * BDRV_SECTOR_SIZE),
2583 number_heads,
2584 BlockdevVmdkAdapterType_str(adapter_type),
2585 toolsversion);
2586 desc_len = strlen(desc);
2587 /* the descriptor offset = 0x200 */
2588 if (!split && !flat) {
2589 desc_offset = 0x200;
2590 }
2591
2592 ret = blk_co_pwrite(blk, desc_offset, desc_len, desc, 0);
2593 if (ret < 0) {
2594 error_setg_errno(errp, -ret, "Could not write description");
2595 goto exit;
2596 }
2597 /* bdrv_pwrite write padding zeros to align to sector, we don't need that
2598 * for description file */
2599 if (desc_offset == 0) {
2600 ret = blk_co_truncate(blk, desc_len, false, PREALLOC_MODE_OFF, 0, errp);
2601 if (ret < 0) {
2602 goto exit;
2603 }
2604 }
2605 ret = 0;
2606 exit:
2607 if (blk) {
2608 blk_co_unref(blk);
2609 }
2610 g_free(desc);
2611 g_free(parent_desc_line);
2612 g_string_free(ext_desc_lines, true);
2613 return ret;
2614 }
2615
2616 typedef struct {
2617 char *path;
2618 char *prefix;
2619 char *postfix;
2620 QemuOpts *opts;
2621 } VMDKCreateOptsData;
2622
2623 static BlockBackend * coroutine_fn GRAPH_UNLOCKED
2624 vmdk_co_create_opts_cb(int64_t size, int idx, bool flat, bool split,
2625 bool compress, bool zeroed_grain, void *opaque,
2626 Error **errp)
2627 {
2628 BlockBackend *blk = NULL;
2629 BlockDriverState *bs = NULL;
2630 VMDKCreateOptsData *data = opaque;
2631 char *ext_filename = NULL;
2632 char *rel_filename = NULL;
2633
2634 /* We're done, don't create excess extents. */
2635 if (size == -1) {
2636 assert(errp == NULL);
2637 return NULL;
2638 }
2639
2640 if (idx == 0) {
2641 rel_filename = g_strdup_printf("%s%s", data->prefix, data->postfix);
2642 } else if (split) {
2643 rel_filename = g_strdup_printf("%s-%c%03d%s",
2644 data->prefix,
2645 flat ? 'f' : 's', idx, data->postfix);
2646 } else {
2647 assert(idx == 1);
2648 rel_filename = g_strdup_printf("%s-flat%s", data->prefix, data->postfix);
2649 }
2650
2651 ext_filename = g_strdup_printf("%s%s", data->path, rel_filename);
2652 g_free(rel_filename);
2653
2654 if (vmdk_create_extent(ext_filename, size,
2655 flat, compress, zeroed_grain, &blk, data->opts,
2656 errp)) {
2657 goto exit;
2658 }
2659 bdrv_co_unref(bs);
2660 exit:
2661 g_free(ext_filename);
2662 return blk;
2663 }
2664
2665 static int coroutine_fn GRAPH_UNLOCKED
2666 vmdk_co_create_opts(BlockDriver *drv, const char *filename,
2667 QemuOpts *opts, Error **errp)
2668 {
2669 Error *local_err = NULL;
2670 char *desc = NULL;
2671 int64_t total_size = 0;
2672 char *adapter_type = NULL;
2673 BlockdevVmdkAdapterType adapter_type_enum;
2674 char *backing_file = NULL;
2675 char *hw_version = NULL;
2676 char *toolsversion = NULL;
2677 char *fmt = NULL;
2678 BlockdevVmdkSubformat subformat;
2679 int ret = 0;
2680 char *path = g_malloc0(PATH_MAX);
2681 char *prefix = g_malloc0(PATH_MAX);
2682 char *postfix = g_malloc0(PATH_MAX);
2683 char *desc_line = g_malloc0(BUF_SIZE);
2684 char *ext_filename = g_malloc0(PATH_MAX);
2685 char *desc_filename = g_malloc0(PATH_MAX);
2686 char *parent_desc_line = g_malloc0(BUF_SIZE);
2687 bool zeroed_grain;
2688 bool compat6;
2689 VMDKCreateOptsData data;
2690 char *backing_fmt = NULL;
2691
2692 backing_fmt = qemu_opt_get_del(opts, BLOCK_OPT_BACKING_FMT);
2693 if (backing_fmt && strcmp(backing_fmt, "vmdk") != 0) {
2694 error_setg(errp, "backing_file must be a vmdk image");
2695 ret = -EINVAL;
2696 goto exit;
2697 }
2698
2699 if (filename_decompose(filename, path, prefix, postfix, PATH_MAX, errp)) {
2700 ret = -EINVAL;
2701 goto exit;
2702 }
2703 /* Read out options */
2704 total_size = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0),
2705 BDRV_SECTOR_SIZE);
2706 adapter_type = qemu_opt_get_del(opts, BLOCK_OPT_ADAPTER_TYPE);
2707 backing_file = qemu_opt_get_del(opts, BLOCK_OPT_BACKING_FILE);
2708 hw_version = qemu_opt_get_del(opts, BLOCK_OPT_HWVERSION);
2709 toolsversion = qemu_opt_get_del(opts, BLOCK_OPT_TOOLSVERSION);
2710 compat6 = qemu_opt_get_bool_del(opts, BLOCK_OPT_COMPAT6, false);
2711 if (strcmp(hw_version, "undefined") == 0) {
2712 g_free(hw_version);
2713 hw_version = NULL;
2714 }
2715 fmt = qemu_opt_get_del(opts, BLOCK_OPT_SUBFMT);
2716 zeroed_grain = qemu_opt_get_bool_del(opts, BLOCK_OPT_ZEROED_GRAIN, false);
2717
2718 if (adapter_type) {
2719 adapter_type_enum = qapi_enum_parse(&BlockdevVmdkAdapterType_lookup,
2720 adapter_type,
2721 BLOCKDEV_VMDK_ADAPTER_TYPE_IDE,
2722 &local_err);
2723 if (local_err) {
2724 error_propagate(errp, local_err);
2725 ret = -EINVAL;
2726 goto exit;
2727 }
2728 } else {
2729 adapter_type_enum = BLOCKDEV_VMDK_ADAPTER_TYPE_IDE;
2730 }
2731
2732 if (!fmt) {
2733 /* Default format to monolithicSparse */
2734 subformat = BLOCKDEV_VMDK_SUBFORMAT_MONOLITHICSPARSE;
2735 } else {
2736 subformat = qapi_enum_parse(&BlockdevVmdkSubformat_lookup,
2737 fmt,
2738 BLOCKDEV_VMDK_SUBFORMAT_MONOLITHICSPARSE,
2739 &local_err);
2740 if (local_err) {
2741 error_propagate(errp, local_err);
2742 ret = -EINVAL;
2743 goto exit;
2744 }
2745 }
2746 data = (VMDKCreateOptsData){
2747 .prefix = prefix,
2748 .postfix = postfix,
2749 .path = path,
2750 .opts = opts,
2751 };
2752 ret = vmdk_co_do_create(total_size, subformat, adapter_type_enum,
2753 backing_file, hw_version, toolsversion, compat6,
2754 zeroed_grain, vmdk_co_create_opts_cb, &data, errp);
2755
2756 exit:
2757 g_free(backing_fmt);
2758 g_free(adapter_type);
2759 g_free(backing_file);
2760 g_free(hw_version);
2761 g_free(toolsversion);
2762 g_free(fmt);
2763 g_free(desc);
2764 g_free(path);
2765 g_free(prefix);
2766 g_free(postfix);
2767 g_free(desc_line);
2768 g_free(ext_filename);
2769 g_free(desc_filename);
2770 g_free(parent_desc_line);
2771 return ret;
2772 }
2773
2774 static BlockBackend * coroutine_fn GRAPH_UNLOCKED
2775 vmdk_co_create_cb(int64_t size, int idx, bool flat, bool split, bool compress,
2776 bool zeroed_grain, void *opaque, Error **errp)
2777 {
2778 int ret;
2779 BlockDriverState *bs;
2780 BlockBackend *blk;
2781 BlockdevCreateOptionsVmdk *opts = opaque;
2782
2783 if (idx == 0) {
2784 bs = bdrv_co_open_blockdev_ref(opts->file, errp);
2785 } else {
2786 int i;
2787 BlockdevRefList *list = opts->extents;
2788 for (i = 1; i < idx; i++) {
2789 if (!list || !list->next) {
2790 error_setg(errp, "Extent [%d] not specified", i);
2791 return NULL;
2792 }
2793 list = list->next;
2794 }
2795 if (!list) {
2796 error_setg(errp, "Extent [%d] not specified", idx - 1);
2797 return NULL;
2798 }
2799 bs = bdrv_co_open_blockdev_ref(list->value, errp);
2800 }
2801 if (!bs) {
2802 return NULL;
2803 }
2804 blk = blk_co_new_with_bs(bs,
2805 BLK_PERM_CONSISTENT_READ | BLK_PERM_WRITE |
2806 BLK_PERM_RESIZE,
2807 BLK_PERM_ALL,
2808 errp);
2809 if (!blk) {
2810 return NULL;
2811 }
2812 blk_set_allow_write_beyond_eof(blk, true);
2813 bdrv_co_unref(bs);
2814
2815 if (size != -1) {
2816 ret = vmdk_init_extent(blk, size, flat, compress, zeroed_grain, errp);
2817 if (ret) {
2818 blk_co_unref(blk);
2819 blk = NULL;
2820 }
2821 }
2822 return blk;
2823 }
2824
2825 static int coroutine_fn GRAPH_UNLOCKED
2826 vmdk_co_create(BlockdevCreateOptions *create_options, Error **errp)
2827 {
2828 BlockdevCreateOptionsVmdk *opts;
2829
2830 opts = &create_options->u.vmdk;
2831
2832 /* Validate options */
2833 if (!QEMU_IS_ALIGNED(opts->size, BDRV_SECTOR_SIZE)) {
2834 error_setg(errp, "Image size must be a multiple of 512 bytes");
2835 return -EINVAL;
2836 }
2837
2838 return vmdk_co_do_create(opts->size,
2839 opts->subformat,
2840 opts->adapter_type,
2841 opts->backing_file,
2842 opts->hwversion,
2843 opts->toolsversion,
2844 false,
2845 opts->zeroed_grain,
2846 vmdk_co_create_cb,
2847 opts, errp);
2848 }
2849
2850 static void vmdk_close(BlockDriverState *bs)
2851 {
2852 BDRVVmdkState *s = bs->opaque;
2853
2854 vmdk_free_extents(bs);
2855 g_free(s->create_type);
2856
2857 migrate_del_blocker(s->migration_blocker);
2858 error_free(s->migration_blocker);
2859 }
2860
2861 static int64_t coroutine_fn GRAPH_RDLOCK
2862 vmdk_co_get_allocated_file_size(BlockDriverState *bs)
2863 {
2864 int i;
2865 int64_t ret = 0;
2866 int64_t r;
2867 BDRVVmdkState *s = bs->opaque;
2868
2869 ret = bdrv_co_get_allocated_file_size(bs->file->bs);
2870 if (ret < 0) {
2871 return ret;
2872 }
2873 for (i = 0; i < s->num_extents; i++) {
2874 if (s->extents[i].file == bs->file) {
2875 continue;
2876 }
2877 r = bdrv_co_get_allocated_file_size(s->extents[i].file->bs);
2878 if (r < 0) {
2879 return r;
2880 }
2881 ret += r;
2882 }
2883 return ret;
2884 }
2885
2886 static int vmdk_has_zero_init(BlockDriverState *bs)
2887 {
2888 int i;
2889 BDRVVmdkState *s = bs->opaque;
2890
2891 /* If has a flat extent and its underlying storage doesn't have zero init,
2892 * return 0. */
2893 for (i = 0; i < s->num_extents; i++) {
2894 if (s->extents[i].flat) {
2895 if (!bdrv_has_zero_init(s->extents[i].file->bs)) {
2896 return 0;
2897 }
2898 }
2899 }
2900 return 1;
2901 }
2902
2903 static VmdkExtentInfo *vmdk_get_extent_info(VmdkExtent *extent)
2904 {
2905 VmdkExtentInfo *info = g_new0(VmdkExtentInfo, 1);
2906
2907 bdrv_refresh_filename(extent->file->bs);
2908 *info = (VmdkExtentInfo){
2909 .filename = g_strdup(extent->file->bs->filename),
2910 .format = g_strdup(extent->type),
2911 .virtual_size = extent->sectors * BDRV_SECTOR_SIZE,
2912 .compressed = extent->compressed,
2913 .has_compressed = extent->compressed,
2914 .cluster_size = extent->cluster_sectors * BDRV_SECTOR_SIZE,
2915 .has_cluster_size = !extent->flat,
2916 };
2917
2918 return info;
2919 }
2920
2921 static int coroutine_fn GRAPH_RDLOCK
2922 vmdk_co_check(BlockDriverState *bs, BdrvCheckResult *result, BdrvCheckMode fix)
2923 {
2924 BDRVVmdkState *s = bs->opaque;
2925 VmdkExtent *extent = NULL;
2926 int64_t sector_num = 0;
2927 int64_t total_sectors = bdrv_co_nb_sectors(bs);
2928 int ret;
2929 uint64_t cluster_offset;
2930
2931 if (fix) {
2932 return -ENOTSUP;
2933 }
2934
2935 for (;;) {
2936 if (sector_num >= total_sectors) {
2937 return 0;
2938 }
2939 extent = find_extent(s, sector_num, extent);
2940 if (!extent) {
2941 fprintf(stderr,
2942 "ERROR: could not find extent for sector %" PRId64 "\n",
2943 sector_num);
2944 ret = -EINVAL;
2945 break;
2946 }
2947 ret = get_cluster_offset(bs, extent, NULL,
2948 sector_num << BDRV_SECTOR_BITS,
2949 false, &cluster_offset, 0, 0);
2950 if (ret == VMDK_ERROR) {
2951 fprintf(stderr,
2952 "ERROR: could not get cluster_offset for sector %"
2953 PRId64 "\n", sector_num);
2954 break;
2955 }
2956 if (ret == VMDK_OK) {
2957 int64_t extent_len = bdrv_co_getlength(extent->file->bs);
2958 if (extent_len < 0) {
2959 fprintf(stderr,
2960 "ERROR: could not get extent file length for sector %"
2961 PRId64 "\n", sector_num);
2962 ret = extent_len;
2963 break;
2964 }
2965 if (cluster_offset >= extent_len) {
2966 fprintf(stderr,
2967 "ERROR: cluster offset for sector %"
2968 PRId64 " points after EOF\n", sector_num);
2969 ret = -EINVAL;
2970 break;
2971 }
2972 }
2973 sector_num += extent->cluster_sectors;
2974 }
2975
2976 result->corruptions++;
2977 return ret;
2978 }
2979
2980 static ImageInfoSpecific *vmdk_get_specific_info(BlockDriverState *bs,
2981 Error **errp)
2982 {
2983 int i;
2984 BDRVVmdkState *s = bs->opaque;
2985 ImageInfoSpecific *spec_info = g_new0(ImageInfoSpecific, 1);
2986 VmdkExtentInfoList **tail;
2987
2988 *spec_info = (ImageInfoSpecific){
2989 .type = IMAGE_INFO_SPECIFIC_KIND_VMDK,
2990 .u = {
2991 .vmdk.data = g_new0(ImageInfoSpecificVmdk, 1),
2992 },
2993 };
2994
2995 *spec_info->u.vmdk.data = (ImageInfoSpecificVmdk) {
2996 .create_type = g_strdup(s->create_type),
2997 .cid = s->cid,
2998 .parent_cid = s->parent_cid,
2999 };
3000
3001 tail = &spec_info->u.vmdk.data->extents;
3002 for (i = 0; i < s->num_extents; i++) {
3003 QAPI_LIST_APPEND(tail, vmdk_get_extent_info(&s->extents[i]));
3004 }
3005
3006 return spec_info;
3007 }
3008
3009 static bool vmdk_extents_type_eq(const VmdkExtent *a, const VmdkExtent *b)
3010 {
3011 return a->flat == b->flat &&
3012 a->compressed == b->compressed &&
3013 (a->flat || a->cluster_sectors == b->cluster_sectors);
3014 }
3015
3016 static int coroutine_fn
3017 vmdk_co_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
3018 {
3019 int i;
3020 BDRVVmdkState *s = bs->opaque;
3021 assert(s->num_extents);
3022
3023 /* See if we have multiple extents but they have different cases */
3024 for (i = 1; i < s->num_extents; i++) {
3025 if (!vmdk_extents_type_eq(&s->extents[0], &s->extents[i])) {
3026 return -ENOTSUP;
3027 }
3028 }
3029 bdi->needs_compressed_writes = s->extents[0].compressed;
3030 if (!s->extents[0].flat) {
3031 bdi->cluster_size = s->extents[0].cluster_sectors << BDRV_SECTOR_BITS;
3032 }
3033 return 0;
3034 }
3035
3036 static void vmdk_gather_child_options(BlockDriverState *bs, QDict *target,
3037 bool backing_overridden)
3038 {
3039 /* No children but file and backing can be explicitly specified (TODO) */
3040 qdict_put(target, "file",
3041 qobject_ref(bs->file->bs->full_open_options));
3042
3043 if (backing_overridden) {
3044 if (bs->backing) {
3045 qdict_put(target, "backing",
3046 qobject_ref(bs->backing->bs->full_open_options));
3047 } else {
3048 qdict_put_null(target, "backing");
3049 }
3050 }
3051 }
3052
3053 static QemuOptsList vmdk_create_opts = {
3054 .name = "vmdk-create-opts",
3055 .head = QTAILQ_HEAD_INITIALIZER(vmdk_create_opts.head),
3056 .desc = {
3057 {
3058 .name = BLOCK_OPT_SIZE,
3059 .type = QEMU_OPT_SIZE,
3060 .help = "Virtual disk size"
3061 },
3062 {
3063 .name = BLOCK_OPT_ADAPTER_TYPE,
3064 .type = QEMU_OPT_STRING,
3065 .help = "Virtual adapter type, can be one of "
3066 "ide (default), lsilogic, buslogic or legacyESX"
3067 },
3068 {
3069 .name = BLOCK_OPT_BACKING_FILE,
3070 .type = QEMU_OPT_STRING,
3071 .help = "File name of a base image"
3072 },
3073 {
3074 .name = BLOCK_OPT_BACKING_FMT,
3075 .type = QEMU_OPT_STRING,
3076 .help = "Must be 'vmdk' if present",
3077 },
3078 {
3079 .name = BLOCK_OPT_COMPAT6,
3080 .type = QEMU_OPT_BOOL,
3081 .help = "VMDK version 6 image",
3082 .def_value_str = "off"
3083 },
3084 {
3085 .name = BLOCK_OPT_HWVERSION,
3086 .type = QEMU_OPT_STRING,
3087 .help = "VMDK hardware version",
3088 .def_value_str = "undefined"
3089 },
3090 {
3091 .name = BLOCK_OPT_TOOLSVERSION,
3092 .type = QEMU_OPT_STRING,
3093 .help = "VMware guest tools version",
3094 },
3095 {
3096 .name = BLOCK_OPT_SUBFMT,
3097 .type = QEMU_OPT_STRING,
3098 .help =
3099 "VMDK flat extent format, can be one of "
3100 "{monolithicSparse (default) | monolithicFlat | twoGbMaxExtentSparse | twoGbMaxExtentFlat | streamOptimized} "
3101 },
3102 {
3103 .name = BLOCK_OPT_ZEROED_GRAIN,
3104 .type = QEMU_OPT_BOOL,
3105 .help = "Enable efficient zero writes "
3106 "using the zeroed-grain GTE feature"
3107 },
3108 { /* end of list */ }
3109 }
3110 };
3111
3112 static BlockDriver bdrv_vmdk = {
3113 .format_name = "vmdk",
3114 .instance_size = sizeof(BDRVVmdkState),
3115 .bdrv_probe = vmdk_probe,
3116 .bdrv_open = vmdk_open,
3117 .bdrv_co_check = vmdk_co_check,
3118 .bdrv_reopen_prepare = vmdk_reopen_prepare,
3119 .bdrv_reopen_commit = vmdk_reopen_commit,
3120 .bdrv_reopen_abort = vmdk_reopen_abort,
3121 .bdrv_child_perm = bdrv_default_perms,
3122 .bdrv_co_preadv = vmdk_co_preadv,
3123 .bdrv_co_pwritev = vmdk_co_pwritev,
3124 .bdrv_co_pwritev_compressed = vmdk_co_pwritev_compressed,
3125 .bdrv_co_pwrite_zeroes = vmdk_co_pwrite_zeroes,
3126 .bdrv_close = vmdk_close,
3127 .bdrv_co_create_opts = vmdk_co_create_opts,
3128 .bdrv_co_create = vmdk_co_create,
3129 .bdrv_co_block_status = vmdk_co_block_status,
3130 .bdrv_co_get_allocated_file_size = vmdk_co_get_allocated_file_size,
3131 .bdrv_has_zero_init = vmdk_has_zero_init,
3132 .bdrv_get_specific_info = vmdk_get_specific_info,
3133 .bdrv_refresh_limits = vmdk_refresh_limits,
3134 .bdrv_co_get_info = vmdk_co_get_info,
3135 .bdrv_gather_child_options = vmdk_gather_child_options,
3136
3137 .is_format = true,
3138 .supports_backing = true,
3139 .create_opts = &vmdk_create_opts,
3140 };
3141
3142 static void bdrv_vmdk_init(void)
3143 {
3144 bdrv_register(&bdrv_vmdk);
3145 }
3146
3147 block_init(bdrv_vmdk_init);
Random patches