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hw/usb/vt82c686-uhci-pci: Use ISA instead of PCI interrupts
[qemu/armbru.git] / block / vmdk.c
blobd87f6d9aaa0e9380a640f18a02cd46ab3ec30754
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(NULL);
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 GRAPH_RDLOCK
304 vmdk_read_cid(BlockDriverState *bs, int parent, uint32_t *pcid)
305 {
306 char *desc;
307 uint32_t cid;
308 const char *p_name, *cid_str;
309 size_t cid_str_size;
310 BDRVVmdkState *s = bs->opaque;
311 int ret;
312
313 desc = g_malloc0(DESC_SIZE);
314 ret = bdrv_pread(bs->file, s->desc_offset, DESC_SIZE, desc, 0);
315 if (ret < 0) {
316 goto out;
317 }
318
319 if (parent) {
320 cid_str = "parentCID";
321 cid_str_size = sizeof("parentCID");
322 } else {
323 cid_str = "CID";
324 cid_str_size = sizeof("CID");
325 }
326
327 desc[DESC_SIZE - 1] = '\0';
328 p_name = strstr(desc, cid_str);
329 if (p_name == NULL) {
330 ret = -EINVAL;
331 goto out;
332 }
333 p_name += cid_str_size;
334 if (sscanf(p_name, "%" SCNx32, &cid) != 1) {
335 ret = -EINVAL;
336 goto out;
337 }
338 *pcid = cid;
339 ret = 0;
340
341 out:
342 g_free(desc);
343 return ret;
344 }
345
346 static int coroutine_fn GRAPH_RDLOCK
347 vmdk_write_cid(BlockDriverState *bs, uint32_t cid)
348 {
349 char *desc, *tmp_desc;
350 char *p_name, *tmp_str;
351 BDRVVmdkState *s = bs->opaque;
352 int ret = 0;
353
354 desc = g_malloc0(DESC_SIZE);
355 tmp_desc = g_malloc0(DESC_SIZE);
356 ret = bdrv_co_pread(bs->file, s->desc_offset, DESC_SIZE, desc, 0);
357 if (ret < 0) {
358 goto out;
359 }
360
361 desc[DESC_SIZE - 1] = '\0';
362 tmp_str = strstr(desc, "parentCID");
363 if (tmp_str == NULL) {
364 ret = -EINVAL;
365 goto out;
366 }
367
368 pstrcpy(tmp_desc, DESC_SIZE, tmp_str);
369 p_name = strstr(desc, "CID");
370 if (p_name != NULL) {
371 p_name += sizeof("CID");
372 snprintf(p_name, DESC_SIZE - (p_name - desc), "%" PRIx32 "\n", cid);
373 pstrcat(desc, DESC_SIZE, tmp_desc);
374 }
375
376 ret = bdrv_co_pwrite_sync(bs->file, s->desc_offset, DESC_SIZE, desc, 0);
377
378 out:
379 g_free(desc);
380 g_free(tmp_desc);
381 return ret;
382 }
383
384 static int coroutine_fn GRAPH_RDLOCK vmdk_is_cid_valid(BlockDriverState *bs)
385 {
386 BDRVVmdkState *s = bs->opaque;
387 uint32_t cur_pcid;
388
389 if (!s->cid_checked && bs->backing) {
390 BlockDriverState *p_bs = bs->backing->bs;
391
392 if (strcmp(p_bs->drv->format_name, "vmdk")) {
393 /* Backing file is not in vmdk format, so it does not have
394 * a CID, which makes the overlay's parent CID invalid */
395 return 0;
396 }
397
398 if (vmdk_read_cid(p_bs, 0, &cur_pcid) != 0) {
399 /* read failure: report as not valid */
400 return 0;
401 }
402 if (s->parent_cid != cur_pcid) {
403 /* CID not valid */
404 return 0;
405 }
406 }
407 s->cid_checked = true;
408 /* CID valid */
409 return 1;
410 }
411
412 static int vmdk_reopen_prepare(BDRVReopenState *state,
413 BlockReopenQueue *queue, Error **errp)
414 {
415 BDRVVmdkState *s;
416 BDRVVmdkReopenState *rs;
417 int i;
418
419 GLOBAL_STATE_CODE();
420 GRAPH_RDLOCK_GUARD_MAINLOOP();
421
422 assert(state != NULL);
423 assert(state->bs != NULL);
424 assert(state->opaque == NULL);
425
426 s = state->bs->opaque;
427
428 rs = g_new0(BDRVVmdkReopenState, 1);
429 state->opaque = rs;
430
431 /*
432 * Check whether there are any extents stored in bs->file; if bs->file
433 * changes, we will need to update their .file pointers to follow suit
434 */
435 rs->extents_using_bs_file = g_new(bool, s->num_extents);
436 for (i = 0; i < s->num_extents; i++) {
437 rs->extents_using_bs_file[i] = s->extents[i].file == state->bs->file;
438 }
439
440 return 0;
441 }
442
443 static void vmdk_reopen_clean(BDRVReopenState *state)
444 {
445 BDRVVmdkReopenState *rs = state->opaque;
446
447 g_free(rs->extents_using_bs_file);
448 g_free(rs);
449 state->opaque = NULL;
450 }
451
452 static void vmdk_reopen_commit(BDRVReopenState *state)
453 {
454 BDRVVmdkState *s = state->bs->opaque;
455 BDRVVmdkReopenState *rs = state->opaque;
456 int i;
457
458 GLOBAL_STATE_CODE();
459 GRAPH_RDLOCK_GUARD_MAINLOOP();
460
461 for (i = 0; i < s->num_extents; i++) {
462 if (rs->extents_using_bs_file[i]) {
463 s->extents[i].file = state->bs->file;
464 }
465 }
466
467 vmdk_reopen_clean(state);
468 }
469
470 static void vmdk_reopen_abort(BDRVReopenState *state)
471 {
472 vmdk_reopen_clean(state);
473 }
474
475 static int GRAPH_RDLOCK vmdk_parent_open(BlockDriverState *bs)
476 {
477 char *p_name;
478 char *desc;
479 BDRVVmdkState *s = bs->opaque;
480 int ret;
481
482 desc = g_malloc0(DESC_SIZE + 1);
483 ret = bdrv_pread(bs->file, s->desc_offset, DESC_SIZE, desc, 0);
484 if (ret < 0) {
485 goto out;
486 }
487
488 p_name = strstr(desc, "parentFileNameHint");
489 if (p_name != NULL) {
490 char *end_name;
491
492 p_name += sizeof("parentFileNameHint") + 1;
493 end_name = strchr(p_name, '\"');
494 if (end_name == NULL) {
495 ret = -EINVAL;
496 goto out;
497 }
498 if ((end_name - p_name) > sizeof(bs->auto_backing_file) - 1) {
499 ret = -EINVAL;
500 goto out;
501 }
502
503 pstrcpy(bs->auto_backing_file, end_name - p_name + 1, p_name);
504 pstrcpy(bs->backing_file, sizeof(bs->backing_file),
505 bs->auto_backing_file);
506 pstrcpy(bs->backing_format, sizeof(bs->backing_format),
507 "vmdk");
508 }
509
510 out:
511 g_free(desc);
512 return ret;
513 }
514
515 /* Create and append extent to the extent array. Return the added VmdkExtent
516 * address. return NULL if allocation failed. */
517 static int vmdk_add_extent(BlockDriverState *bs,
518 BdrvChild *file, bool flat, int64_t sectors,
519 int64_t l1_offset, int64_t l1_backup_offset,
520 uint32_t l1_size,
521 int l2_size, uint64_t cluster_sectors,
522 VmdkExtent **new_extent,
523 Error **errp)
524 {
525 VmdkExtent *extent;
526 BDRVVmdkState *s = bs->opaque;
527 int64_t nb_sectors;
528
529 if (cluster_sectors > 0x200000) {
530 /* 0x200000 * 512Bytes = 1GB for one cluster is unrealistic */
531 error_setg(errp, "Invalid granularity, image may be corrupt");
532 return -EFBIG;
533 }
534 if (l1_size > 32 * 1024 * 1024) {
535 /*
536 * Although with big capacity and small l1_entry_sectors, we can get a
537 * big l1_size, we don't want unbounded value to allocate the table.
538 * Limit it to 32M, which is enough to store:
539 * 8TB - for both VMDK3 & VMDK4 with
540 * minimal cluster size: 512B
541 * minimal L2 table size: 512 entries
542 * 8 TB is still more than the maximal value supported for
543 * VMDK3 & VMDK4 which is 2TB.
544 * 64TB - for "ESXi seSparse Extent"
545 * minimal cluster size: 512B (default is 4KB)
546 * L2 table size: 4096 entries (const).
547 * 64TB is more than the maximal value supported for
548 * seSparse VMDKs (which is slightly less than 64TB)
549 */
550 error_setg(errp, "L1 size too big");
551 return -EFBIG;
552 }
553
554 nb_sectors = bdrv_nb_sectors(file->bs);
555 if (nb_sectors < 0) {
556 return nb_sectors;
557 }
558
559 s->extents = g_renew(VmdkExtent, s->extents, s->num_extents + 1);
560 extent = &s->extents[s->num_extents];
561 s->num_extents++;
562
563 memset(extent, 0, sizeof(VmdkExtent));
564 extent->file = file;
565 extent->flat = flat;
566 extent->sectors = sectors;
567 extent->l1_table_offset = l1_offset;
568 extent->l1_backup_table_offset = l1_backup_offset;
569 extent->l1_size = l1_size;
570 extent->l1_entry_sectors = l2_size * cluster_sectors;
571 extent->l2_size = l2_size;
572 extent->cluster_sectors = flat ? sectors : cluster_sectors;
573 extent->next_cluster_sector = ROUND_UP(nb_sectors, cluster_sectors);
574 extent->entry_size = sizeof(uint32_t);
575
576 if (s->num_extents > 1) {
577 extent->end_sector = (*(extent - 1)).end_sector + extent->sectors;
578 } else {
579 extent->end_sector = extent->sectors;
580 }
581 bs->total_sectors = extent->end_sector;
582 if (new_extent) {
583 *new_extent = extent;
584 }
585 return 0;
586 }
587
588 static int GRAPH_RDLOCK
589 vmdk_init_tables(BlockDriverState *bs, VmdkExtent *extent, Error **errp)
590 {
591 int ret;
592 size_t l1_size;
593 int i;
594
595 /* read the L1 table */
596 l1_size = extent->l1_size * extent->entry_size;
597 extent->l1_table = g_try_malloc(l1_size);
598 if (l1_size && extent->l1_table == NULL) {
599 return -ENOMEM;
600 }
601
602 ret = bdrv_pread(extent->file, extent->l1_table_offset, l1_size,
603 extent->l1_table, 0);
604 if (ret < 0) {
605 bdrv_refresh_filename(extent->file->bs);
606 error_setg_errno(errp, -ret,
607 "Could not read l1 table from extent '%s'",
608 extent->file->bs->filename);
609 goto fail_l1;
610 }
611 for (i = 0; i < extent->l1_size; i++) {
612 if (extent->entry_size == sizeof(uint64_t)) {
613 le64_to_cpus((uint64_t *)extent->l1_table + i);
614 } else {
615 assert(extent->entry_size == sizeof(uint32_t));
616 le32_to_cpus((uint32_t *)extent->l1_table + i);
617 }
618 }
619
620 if (extent->l1_backup_table_offset) {
621 assert(!extent->sesparse);
622 extent->l1_backup_table = g_try_malloc(l1_size);
623 if (l1_size && extent->l1_backup_table == NULL) {
624 ret = -ENOMEM;
625 goto fail_l1;
626 }
627 ret = bdrv_pread(extent->file, extent->l1_backup_table_offset,
628 l1_size, extent->l1_backup_table, 0);
629 if (ret < 0) {
630 bdrv_refresh_filename(extent->file->bs);
631 error_setg_errno(errp, -ret,
632 "Could not read l1 backup table from extent '%s'",
633 extent->file->bs->filename);
634 goto fail_l1b;
635 }
636 for (i = 0; i < extent->l1_size; i++) {
637 le32_to_cpus(&extent->l1_backup_table[i]);
638 }
639 }
640
641 extent->l2_cache =
642 g_malloc(extent->entry_size * extent->l2_size * L2_CACHE_SIZE);
643 return 0;
644 fail_l1b:
645 g_free(extent->l1_backup_table);
646 fail_l1:
647 g_free(extent->l1_table);
648 return ret;
649 }
650
651 static int GRAPH_RDLOCK
652 vmdk_open_vmfs_sparse(BlockDriverState *bs, BdrvChild *file, int flags,
653 Error **errp)
654 {
655 int ret;
656 uint32_t magic;
657 VMDK3Header header;
658 VmdkExtent *extent = NULL;
659
660 ret = bdrv_pread(file, sizeof(magic), sizeof(header), &header, 0);
661 if (ret < 0) {
662 bdrv_refresh_filename(file->bs);
663 error_setg_errno(errp, -ret,
664 "Could not read header from file '%s'",
665 file->bs->filename);
666 return ret;
667 }
668 ret = vmdk_add_extent(bs, file, false,
669 le32_to_cpu(header.disk_sectors),
670 (int64_t)le32_to_cpu(header.l1dir_offset) << 9,
671 0,
672 le32_to_cpu(header.l1dir_size),
673 4096,
674 le32_to_cpu(header.granularity),
675 &extent,
676 errp);
677 if (ret < 0) {
678 return ret;
679 }
680 ret = vmdk_init_tables(bs, extent, errp);
681 if (ret) {
682 /* free extent allocated by vmdk_add_extent */
683 vmdk_free_last_extent(bs);
684 }
685 return ret;
686 }
687
688 #define SESPARSE_CONST_HEADER_MAGIC UINT64_C(0x00000000cafebabe)
689 #define SESPARSE_VOLATILE_HEADER_MAGIC UINT64_C(0x00000000cafecafe)
690
691 /* Strict checks - format not officially documented */
692 static int check_se_sparse_const_header(VMDKSESparseConstHeader *header,
693 Error **errp)
694 {
695 header->magic = le64_to_cpu(header->magic);
696 header->version = le64_to_cpu(header->version);
697 header->grain_size = le64_to_cpu(header->grain_size);
698 header->grain_table_size = le64_to_cpu(header->grain_table_size);
699 header->flags = le64_to_cpu(header->flags);
700 header->reserved1 = le64_to_cpu(header->reserved1);
701 header->reserved2 = le64_to_cpu(header->reserved2);
702 header->reserved3 = le64_to_cpu(header->reserved3);
703 header->reserved4 = le64_to_cpu(header->reserved4);
704
705 header->volatile_header_offset =
706 le64_to_cpu(header->volatile_header_offset);
707 header->volatile_header_size = le64_to_cpu(header->volatile_header_size);
708
709 header->journal_header_offset = le64_to_cpu(header->journal_header_offset);
710 header->journal_header_size = le64_to_cpu(header->journal_header_size);
711
712 header->journal_offset = le64_to_cpu(header->journal_offset);
713 header->journal_size = le64_to_cpu(header->journal_size);
714
715 header->grain_dir_offset = le64_to_cpu(header->grain_dir_offset);
716 header->grain_dir_size = le64_to_cpu(header->grain_dir_size);
717
718 header->grain_tables_offset = le64_to_cpu(header->grain_tables_offset);
719 header->grain_tables_size = le64_to_cpu(header->grain_tables_size);
720
721 header->free_bitmap_offset = le64_to_cpu(header->free_bitmap_offset);
722 header->free_bitmap_size = le64_to_cpu(header->free_bitmap_size);
723
724 header->backmap_offset = le64_to_cpu(header->backmap_offset);
725 header->backmap_size = le64_to_cpu(header->backmap_size);
726
727 header->grains_offset = le64_to_cpu(header->grains_offset);
728 header->grains_size = le64_to_cpu(header->grains_size);
729
730 if (header->magic != SESPARSE_CONST_HEADER_MAGIC) {
731 error_setg(errp, "Bad const header magic: 0x%016" PRIx64,
732 header->magic);
733 return -EINVAL;
734 }
735
736 if (header->version != 0x0000000200000001) {
737 error_setg(errp, "Unsupported version: 0x%016" PRIx64,
738 header->version);
739 return -ENOTSUP;
740 }
741
742 if (header->grain_size != 8) {
743 error_setg(errp, "Unsupported grain size: %" PRIu64,
744 header->grain_size);
745 return -ENOTSUP;
746 }
747
748 if (header->grain_table_size != 64) {
749 error_setg(errp, "Unsupported grain table size: %" PRIu64,
750 header->grain_table_size);
751 return -ENOTSUP;
752 }
753
754 if (header->flags != 0) {
755 error_setg(errp, "Unsupported flags: 0x%016" PRIx64,
756 header->flags);
757 return -ENOTSUP;
758 }
759
760 if (header->reserved1 != 0 || header->reserved2 != 0 ||
761 header->reserved3 != 0 || header->reserved4 != 0) {
762 error_setg(errp, "Unsupported reserved bits:"
763 " 0x%016" PRIx64 " 0x%016" PRIx64
764 " 0x%016" PRIx64 " 0x%016" PRIx64,
765 header->reserved1, header->reserved2,
766 header->reserved3, header->reserved4);
767 return -ENOTSUP;
768 }
769
770 /* check that padding is 0 */
771 if (!buffer_is_zero(header->pad, sizeof(header->pad))) {
772 error_setg(errp, "Unsupported non-zero const header padding");
773 return -ENOTSUP;
774 }
775
776 return 0;
777 }
778
779 static int check_se_sparse_volatile_header(VMDKSESparseVolatileHeader *header,
780 Error **errp)
781 {
782 header->magic = le64_to_cpu(header->magic);
783 header->free_gt_number = le64_to_cpu(header->free_gt_number);
784 header->next_txn_seq_number = le64_to_cpu(header->next_txn_seq_number);
785 header->replay_journal = le64_to_cpu(header->replay_journal);
786
787 if (header->magic != SESPARSE_VOLATILE_HEADER_MAGIC) {
788 error_setg(errp, "Bad volatile header magic: 0x%016" PRIx64,
789 header->magic);
790 return -EINVAL;
791 }
792
793 if (header->replay_journal) {
794 error_setg(errp, "Image is dirty, Replaying journal not supported");
795 return -ENOTSUP;
796 }
797
798 /* check that padding is 0 */
799 if (!buffer_is_zero(header->pad, sizeof(header->pad))) {
800 error_setg(errp, "Unsupported non-zero volatile header padding");
801 return -ENOTSUP;
802 }
803
804 return 0;
805 }
806
807 static int GRAPH_RDLOCK
808 vmdk_open_se_sparse(BlockDriverState *bs, BdrvChild *file, int flags,
809 Error **errp)
810 {
811 int ret;
812 VMDKSESparseConstHeader const_header;
813 VMDKSESparseVolatileHeader volatile_header;
814 VmdkExtent *extent = NULL;
815
816 ret = bdrv_apply_auto_read_only(bs,
817 "No write support for seSparse images available", errp);
818 if (ret < 0) {
819 return ret;
820 }
821
822 assert(sizeof(const_header) == SECTOR_SIZE);
823
824 ret = bdrv_pread(file, 0, sizeof(const_header), &const_header, 0);
825 if (ret < 0) {
826 bdrv_refresh_filename(file->bs);
827 error_setg_errno(errp, -ret,
828 "Could not read const header from file '%s'",
829 file->bs->filename);
830 return ret;
831 }
832
833 /* check const header */
834 ret = check_se_sparse_const_header(&const_header, errp);
835 if (ret < 0) {
836 return ret;
837 }
838
839 assert(sizeof(volatile_header) == SECTOR_SIZE);
840
841 ret = bdrv_pread(file, const_header.volatile_header_offset * SECTOR_SIZE,
842 sizeof(volatile_header), &volatile_header, 0);
843 if (ret < 0) {
844 bdrv_refresh_filename(file->bs);
845 error_setg_errno(errp, -ret,
846 "Could not read volatile header from file '%s'",
847 file->bs->filename);
848 return ret;
849 }
850
851 /* check volatile header */
852 ret = check_se_sparse_volatile_header(&volatile_header, errp);
853 if (ret < 0) {
854 return ret;
855 }
856
857 ret = vmdk_add_extent(bs, file, false,
858 const_header.capacity,
859 const_header.grain_dir_offset * SECTOR_SIZE,
860 0,
861 const_header.grain_dir_size *
862 SECTOR_SIZE / sizeof(uint64_t),
863 const_header.grain_table_size *
864 SECTOR_SIZE / sizeof(uint64_t),
865 const_header.grain_size,
866 &extent,
867 errp);
868 if (ret < 0) {
869 return ret;
870 }
871
872 extent->sesparse = true;
873 extent->sesparse_l2_tables_offset = const_header.grain_tables_offset;
874 extent->sesparse_clusters_offset = const_header.grains_offset;
875 extent->entry_size = sizeof(uint64_t);
876
877 ret = vmdk_init_tables(bs, extent, errp);
878 if (ret) {
879 /* free extent allocated by vmdk_add_extent */
880 vmdk_free_last_extent(bs);
881 }
882
883 return ret;
884 }
885
886 static int vmdk_open_desc_file(BlockDriverState *bs, int flags, char *buf,
887 QDict *options, Error **errp);
888
889 static char *vmdk_read_desc(BdrvChild *file, uint64_t desc_offset, Error **errp)
890 {
891 int64_t size;
892 char *buf;
893 int ret;
894
895 size = bdrv_getlength(file->bs);
896 if (size < 0) {
897 error_setg_errno(errp, -size, "Could not access file");
898 return NULL;
899 }
900
901 if (size < 4) {
902 /* Both descriptor file and sparse image must be much larger than 4
903 * bytes, also callers of vmdk_read_desc want to compare the first 4
904 * bytes with VMDK4_MAGIC, let's error out if less is read. */
905 error_setg(errp, "File is too small, not a valid image");
906 return NULL;
907 }
908
909 size = MIN(size, (1 << 20) - 1); /* avoid unbounded allocation */
910 buf = g_malloc(size + 1);
911
912 ret = bdrv_pread(file, desc_offset, size, buf, 0);
913 if (ret < 0) {
914 error_setg_errno(errp, -ret, "Could not read from file");
915 g_free(buf);
916 return NULL;
917 }
918 buf[size] = 0;
919
920 return buf;
921 }
922
923 static int GRAPH_RDLOCK
924 vmdk_open_vmdk4(BlockDriverState *bs, BdrvChild *file, int flags,
925 QDict *options, Error **errp)
926 {
927 int ret;
928 uint32_t magic;
929 uint32_t l1_size, l1_entry_sectors;
930 VMDK4Header header;
931 VmdkExtent *extent = NULL;
932 BDRVVmdkState *s = bs->opaque;
933 int64_t l1_backup_offset = 0;
934 bool compressed;
935
936 ret = bdrv_pread(file, sizeof(magic), sizeof(header), &header, 0);
937 if (ret < 0) {
938 bdrv_refresh_filename(file->bs);
939 error_setg_errno(errp, -ret,
940 "Could not read header from file '%s'",
941 file->bs->filename);
942 return -EINVAL;
943 }
944 if (header.capacity == 0) {
945 uint64_t desc_offset = le64_to_cpu(header.desc_offset);
946 if (desc_offset) {
947 char *buf = vmdk_read_desc(file, desc_offset << 9, errp);
948 if (!buf) {
949 return -EINVAL;
950 }
951 ret = vmdk_open_desc_file(bs, flags, buf, options, errp);
952 g_free(buf);
953 return ret;
954 }
955 }
956
957 if (!s->create_type) {
958 s->create_type = g_strdup("monolithicSparse");
959 }
960
961 if (le64_to_cpu(header.gd_offset) == VMDK4_GD_AT_END) {
962 /*
963 * The footer takes precedence over the header, so read it in. The
964 * footer starts at offset -1024 from the end: One sector for the
965 * footer, and another one for the end-of-stream marker.
966 */
967 struct {
968 struct {
969 uint64_t val;
970 uint32_t size;
971 uint32_t type;
972 uint8_t pad[512 - 16];
973 } QEMU_PACKED footer_marker;
974
975 uint32_t magic;
976 VMDK4Header header;
977 uint8_t pad[512 - 4 - sizeof(VMDK4Header)];
978
979 struct {
980 uint64_t val;
981 uint32_t size;
982 uint32_t type;
983 uint8_t pad[512 - 16];
984 } QEMU_PACKED eos_marker;
985 } QEMU_PACKED footer;
986
987 ret = bdrv_pread(file, bs->file->bs->total_sectors * 512 - 1536,
988 sizeof(footer), &footer, 0);
989 if (ret < 0) {
990 error_setg_errno(errp, -ret, "Failed to read footer");
991 return ret;
992 }
993
994 /* Some sanity checks for the footer */
995 if (be32_to_cpu(footer.magic) != VMDK4_MAGIC ||
996 le32_to_cpu(footer.footer_marker.size) != 0 ||
997 le32_to_cpu(footer.footer_marker.type) != MARKER_FOOTER ||
998 le64_to_cpu(footer.eos_marker.val) != 0 ||
999 le32_to_cpu(footer.eos_marker.size) != 0 ||
1000 le32_to_cpu(footer.eos_marker.type) != MARKER_END_OF_STREAM)
1001 {
1002 error_setg(errp, "Invalid footer");
1003 return -EINVAL;
1004 }
1005
1006 header = footer.header;
1007 }
1008
1009 compressed =
1010 le16_to_cpu(header.compressAlgorithm) == VMDK4_COMPRESSION_DEFLATE;
1011 if (le32_to_cpu(header.version) > 3) {
1012 error_setg(errp, "Unsupported VMDK version %" PRIu32,
1013 le32_to_cpu(header.version));
1014 return -ENOTSUP;
1015 } else if (le32_to_cpu(header.version) == 3 && (flags & BDRV_O_RDWR) &&
1016 !compressed) {
1017 /* VMware KB 2064959 explains that version 3 added support for
1018 * persistent changed block tracking (CBT), and backup software can
1019 * read it as version=1 if it doesn't care about the changed area
1020 * information. So we are safe to enable read only. */
1021 error_setg(errp, "VMDK version 3 must be read only");
1022 return -EINVAL;
1023 }
1024
1025 if (le32_to_cpu(header.num_gtes_per_gt) > 512) {
1026 error_setg(errp, "L2 table size too big");
1027 return -EINVAL;
1028 }
1029
1030 l1_entry_sectors = le32_to_cpu(header.num_gtes_per_gt)
1031 * le64_to_cpu(header.granularity);
1032 if (l1_entry_sectors == 0) {
1033 error_setg(errp, "L1 entry size is invalid");
1034 return -EINVAL;
1035 }
1036 l1_size = (le64_to_cpu(header.capacity) + l1_entry_sectors - 1)
1037 / l1_entry_sectors;
1038 if (le32_to_cpu(header.flags) & VMDK4_FLAG_RGD) {
1039 l1_backup_offset = le64_to_cpu(header.rgd_offset) << 9;
1040 }
1041 if (bdrv_nb_sectors(file->bs) < le64_to_cpu(header.grain_offset)) {
1042 error_setg(errp, "File truncated, expecting at least %" PRId64 " bytes",
1043 (int64_t)(le64_to_cpu(header.grain_offset)
1044 * BDRV_SECTOR_SIZE));
1045 return -EINVAL;
1046 }
1047
1048 ret = vmdk_add_extent(bs, file, false,
1049 le64_to_cpu(header.capacity),
1050 le64_to_cpu(header.gd_offset) << 9,
1051 l1_backup_offset,
1052 l1_size,
1053 le32_to_cpu(header.num_gtes_per_gt),
1054 le64_to_cpu(header.granularity),
1055 &extent,
1056 errp);
1057 if (ret < 0) {
1058 return ret;
1059 }
1060 extent->compressed =
1061 le16_to_cpu(header.compressAlgorithm) == VMDK4_COMPRESSION_DEFLATE;
1062 if (extent->compressed) {
1063 g_free(s->create_type);
1064 s->create_type = g_strdup("streamOptimized");
1065 }
1066 extent->has_marker = le32_to_cpu(header.flags) & VMDK4_FLAG_MARKER;
1067 extent->version = le32_to_cpu(header.version);
1068 extent->has_zero_grain = le32_to_cpu(header.flags) & VMDK4_FLAG_ZERO_GRAIN;
1069 ret = vmdk_init_tables(bs, extent, errp);
1070 if (ret) {
1071 /* free extent allocated by vmdk_add_extent */
1072 vmdk_free_last_extent(bs);
1073 }
1074 return ret;
1075 }
1076
1077 /* find an option value out of descriptor file */
1078 static int vmdk_parse_description(const char *desc, const char *opt_name,
1079 char *buf, int buf_size)
1080 {
1081 char *opt_pos, *opt_end;
1082 const char *end = desc + strlen(desc);
1083
1084 opt_pos = strstr(desc, opt_name);
1085 if (!opt_pos) {
1086 return VMDK_ERROR;
1087 }
1088 /* Skip "=\"" following opt_name */
1089 opt_pos += strlen(opt_name) + 2;
1090 if (opt_pos >= end) {
1091 return VMDK_ERROR;
1092 }
1093 opt_end = opt_pos;
1094 while (opt_end < end && *opt_end != '"') {
1095 opt_end++;
1096 }
1097 if (opt_end == end || buf_size < opt_end - opt_pos + 1) {
1098 return VMDK_ERROR;
1099 }
1100 pstrcpy(buf, opt_end - opt_pos + 1, opt_pos);
1101 return VMDK_OK;
1102 }
1103
1104 /* Open an extent file and append to bs array */
1105 static int GRAPH_RDLOCK
1106 vmdk_open_sparse(BlockDriverState *bs, BdrvChild *file, int flags,
1107 char *buf, QDict *options, Error **errp)
1108 {
1109 uint32_t magic;
1110
1111 magic = ldl_be_p(buf);
1112 switch (magic) {
1113 case VMDK3_MAGIC:
1114 return vmdk_open_vmfs_sparse(bs, file, flags, errp);
1115 case VMDK4_MAGIC:
1116 return vmdk_open_vmdk4(bs, file, flags, options, errp);
1117 default:
1118 error_setg(errp, "Image not in VMDK format");
1119 return -EINVAL;
1120 }
1121 }
1122
1123 static const char *next_line(const char *s)
1124 {
1125 while (*s) {
1126 if (*s == '\n') {
1127 return s + 1;
1128 }
1129 s++;
1130 }
1131 return s;
1132 }
1133
1134 static int GRAPH_RDLOCK
1135 vmdk_parse_extents(const char *desc, BlockDriverState *bs, QDict *options,
1136 Error **errp)
1137 {
1138 int ret;
1139 int matches;
1140 char access[11];
1141 char type[11];
1142 char fname[512];
1143 const char *p, *np;
1144 int64_t sectors = 0;
1145 int64_t flat_offset;
1146 char *desc_file_dir = NULL;
1147 char *extent_path;
1148 BdrvChild *extent_file;
1149 BdrvChildRole extent_role;
1150 BDRVVmdkState *s = bs->opaque;
1151 VmdkExtent *extent = NULL;
1152 char extent_opt_prefix[32];
1153 Error *local_err = NULL;
1154
1155 GLOBAL_STATE_CODE();
1156
1157 for (p = desc; *p; p = next_line(p)) {
1158 /* parse extent line in one of below formats:
1159 *
1160 * RW [size in sectors] FLAT "file-name.vmdk" OFFSET
1161 * RW [size in sectors] SPARSE "file-name.vmdk"
1162 * RW [size in sectors] VMFS "file-name.vmdk"
1163 * RW [size in sectors] VMFSSPARSE "file-name.vmdk"
1164 * RW [size in sectors] SESPARSE "file-name.vmdk"
1165 */
1166 flat_offset = -1;
1167 matches = sscanf(p, "%10s %" SCNd64 " %10s \"%511[^\n\r\"]\" %" SCNd64,
1168 access, &sectors, type, fname, &flat_offset);
1169 if (matches < 4 || strcmp(access, "RW")) {
1170 continue;
1171 } else if (!strcmp(type, "FLAT")) {
1172 if (matches != 5 || flat_offset < 0) {
1173 goto invalid;
1174 }
1175 } else if (!strcmp(type, "VMFS")) {
1176 if (matches == 4) {
1177 flat_offset = 0;
1178 } else {
1179 goto invalid;
1180 }
1181 } else if (matches != 4) {
1182 goto invalid;
1183 }
1184
1185 if (sectors <= 0 ||
1186 (strcmp(type, "FLAT") && strcmp(type, "SPARSE") &&
1187 strcmp(type, "VMFS") && strcmp(type, "VMFSSPARSE") &&
1188 strcmp(type, "SESPARSE")) ||
1189 (strcmp(access, "RW"))) {
1190 continue;
1191 }
1192
1193 if (path_is_absolute(fname)) {
1194 extent_path = g_strdup(fname);
1195 } else {
1196 if (!desc_file_dir) {
1197 desc_file_dir = bdrv_dirname(bs->file->bs, errp);
1198 if (!desc_file_dir) {
1199 bdrv_refresh_filename(bs->file->bs);
1200 error_prepend(errp, "Cannot use relative paths with VMDK "
1201 "descriptor file '%s': ",
1202 bs->file->bs->filename);
1203 ret = -EINVAL;
1204 goto out;
1205 }
1206 }
1207
1208 extent_path = g_strconcat(desc_file_dir, fname, NULL);
1209 }
1210
1211 ret = snprintf(extent_opt_prefix, 32, "extents.%d", s->num_extents);
1212 assert(ret < 32);
1213
1214 extent_role = BDRV_CHILD_DATA;
1215 if (strcmp(type, "FLAT") != 0 && strcmp(type, "VMFS") != 0) {
1216 /* non-flat extents have metadata */
1217 extent_role |= BDRV_CHILD_METADATA;
1218 }
1219
1220 extent_file = bdrv_open_child(extent_path, options, extent_opt_prefix,
1221 bs, &child_of_bds, extent_role, false,
1222 &local_err);
1223 g_free(extent_path);
1224 if (!extent_file) {
1225 error_propagate(errp, local_err);
1226 ret = -EINVAL;
1227 goto out;
1228 }
1229
1230 /* save to extents array */
1231 if (!strcmp(type, "FLAT") || !strcmp(type, "VMFS")) {
1232 /* FLAT extent */
1233
1234 ret = vmdk_add_extent(bs, extent_file, true, sectors,
1235 0, 0, 0, 0, 0, &extent, errp);
1236 if (ret < 0) {
1237 bdrv_graph_rdunlock_main_loop();
1238 bdrv_graph_wrlock(NULL);
1239 bdrv_unref_child(bs, extent_file);
1240 bdrv_graph_wrunlock(NULL);
1241 bdrv_graph_rdlock_main_loop();
1242 goto out;
1243 }
1244 extent->flat_start_offset = flat_offset << 9;
1245 } else if (!strcmp(type, "SPARSE") || !strcmp(type, "VMFSSPARSE")) {
1246 /* SPARSE extent and VMFSSPARSE extent are both "COWD" sparse file*/
1247 char *buf = vmdk_read_desc(extent_file, 0, errp);
1248 if (!buf) {
1249 ret = -EINVAL;
1250 } else {
1251 ret = vmdk_open_sparse(bs, extent_file, bs->open_flags, buf,
1252 options, errp);
1253 }
1254 g_free(buf);
1255 if (ret) {
1256 bdrv_graph_rdunlock_main_loop();
1257 bdrv_graph_wrlock(NULL);
1258 bdrv_unref_child(bs, extent_file);
1259 bdrv_graph_wrunlock(NULL);
1260 bdrv_graph_rdlock_main_loop();
1261 goto out;
1262 }
1263 extent = &s->extents[s->num_extents - 1];
1264 } else if (!strcmp(type, "SESPARSE")) {
1265 ret = vmdk_open_se_sparse(bs, extent_file, bs->open_flags, errp);
1266 if (ret) {
1267 bdrv_graph_rdunlock_main_loop();
1268 bdrv_graph_wrlock(NULL);
1269 bdrv_unref_child(bs, extent_file);
1270 bdrv_graph_wrunlock(NULL);
1271 bdrv_graph_rdlock_main_loop();
1272 goto out;
1273 }
1274 extent = &s->extents[s->num_extents - 1];
1275 } else {
1276 error_setg(errp, "Unsupported extent type '%s'", type);
1277 bdrv_graph_rdunlock_main_loop();
1278 bdrv_graph_wrlock(NULL);
1279 bdrv_unref_child(bs, extent_file);
1280 bdrv_graph_wrunlock(NULL);
1281 bdrv_graph_rdlock_main_loop();
1282 ret = -ENOTSUP;
1283 goto out;
1284 }
1285 extent->type = g_strdup(type);
1286 }
1287
1288 ret = 0;
1289 goto out;
1290
1291 invalid:
1292 np = next_line(p);
1293 assert(np != p);
1294 if (np[-1] == '\n') {
1295 np--;
1296 }
1297 error_setg(errp, "Invalid extent line: %.*s", (int)(np - p), p);
1298 ret = -EINVAL;
1299
1300 out:
1301 g_free(desc_file_dir);
1302 return ret;
1303 }
1304
1305 static int GRAPH_RDLOCK
1306 vmdk_open_desc_file(BlockDriverState *bs, int flags, char *buf, QDict *options,
1307 Error **errp)
1308 {
1309 int ret;
1310 char ct[128];
1311 BDRVVmdkState *s = bs->opaque;
1312
1313 if (vmdk_parse_description(buf, "createType", ct, sizeof(ct))) {
1314 error_setg(errp, "invalid VMDK image descriptor");
1315 ret = -EINVAL;
1316 goto exit;
1317 }
1318 if (strcmp(ct, "monolithicFlat") &&
1319 strcmp(ct, "vmfs") &&
1320 strcmp(ct, "vmfsSparse") &&
1321 strcmp(ct, "seSparse") &&
1322 strcmp(ct, "twoGbMaxExtentSparse") &&
1323 strcmp(ct, "twoGbMaxExtentFlat")) {
1324 error_setg(errp, "Unsupported image type '%s'", ct);
1325 ret = -ENOTSUP;
1326 goto exit;
1327 }
1328 s->create_type = g_strdup(ct);
1329 s->desc_offset = 0;
1330 ret = vmdk_parse_extents(buf, bs, options, errp);
1331 exit:
1332 return ret;
1333 }
1334
1335 static int vmdk_open(BlockDriverState *bs, QDict *options, int flags,
1336 Error **errp)
1337 {
1338 char *buf;
1339 int ret;
1340 BDRVVmdkState *s = bs->opaque;
1341 uint32_t magic;
1342
1343 GRAPH_RDLOCK_GUARD_MAINLOOP();
1344
1345 ret = bdrv_open_file_child(NULL, options, "file", bs, errp);
1346 if (ret < 0) {
1347 return ret;
1348 }
1349
1350 buf = vmdk_read_desc(bs->file, 0, errp);
1351 if (!buf) {
1352 return -EINVAL;
1353 }
1354
1355 magic = ldl_be_p(buf);
1356 switch (magic) {
1357 case VMDK3_MAGIC:
1358 case VMDK4_MAGIC:
1359 ret = vmdk_open_sparse(bs, bs->file, flags, buf, options,
1360 errp);
1361 s->desc_offset = 0x200;
1362 break;
1363 default:
1364 /* No data in the descriptor file */
1365 bs->file->role &= ~BDRV_CHILD_DATA;
1366
1367 /* Must succeed because we have given up permissions if anything */
1368 bdrv_child_refresh_perms(bs, bs->file, &error_abort);
1369
1370 ret = vmdk_open_desc_file(bs, flags, buf, options, errp);
1371 break;
1372 }
1373 if (ret) {
1374 goto fail;
1375 }
1376
1377 /* try to open parent images, if exist */
1378 ret = vmdk_parent_open(bs);
1379 if (ret) {
1380 goto fail;
1381 }
1382 ret = vmdk_read_cid(bs, 0, &s->cid);
1383 if (ret) {
1384 goto fail;
1385 }
1386 ret = vmdk_read_cid(bs, 1, &s->parent_cid);
1387 if (ret) {
1388 goto fail;
1389 }
1390 qemu_co_mutex_init(&s->lock);
1391
1392 /* Disable migration when VMDK images are used */
1393 error_setg(&s->migration_blocker, "The vmdk format used by node '%s' "
1394 "does not support live migration",
1395 bdrv_get_device_or_node_name(bs));
1396 ret = migrate_add_blocker_normal(&s->migration_blocker, errp);
1397 if (ret < 0) {
1398 goto fail;
1399 }
1400
1401 g_free(buf);
1402 return 0;
1403
1404 fail:
1405 g_free(buf);
1406 g_free(s->create_type);
1407 s->create_type = NULL;
1408 vmdk_free_extents(bs);
1409 return ret;
1410 }
1411
1412
1413 static void vmdk_refresh_limits(BlockDriverState *bs, Error **errp)
1414 {
1415 BDRVVmdkState *s = bs->opaque;
1416 int i;
1417
1418 for (i = 0; i < s->num_extents; i++) {
1419 if (!s->extents[i].flat) {
1420 bs->bl.pwrite_zeroes_alignment =
1421 MAX(bs->bl.pwrite_zeroes_alignment,
1422 s->extents[i].cluster_sectors << BDRV_SECTOR_BITS);
1423 }
1424 }
1425 }
1426
1427 /**
1428 * get_whole_cluster
1429 *
1430 * Copy backing file's cluster that covers @sector_num, otherwise write zero,
1431 * to the cluster at @cluster_sector_num. If @zeroed is true, we're overwriting
1432 * a zeroed cluster in the current layer and must not copy data from the
1433 * backing file.
1434 *
1435 * If @skip_start_sector < @skip_end_sector, the relative range
1436 * [@skip_start_sector, @skip_end_sector) is not copied or written, and leave
1437 * it for call to write user data in the request.
1438 */
1439 static int coroutine_fn GRAPH_RDLOCK
1440 get_whole_cluster(BlockDriverState *bs, VmdkExtent *extent,
1441 uint64_t cluster_offset, uint64_t offset,
1442 uint64_t skip_start_bytes, uint64_t skip_end_bytes,
1443 bool zeroed)
1444 {
1445 int ret = VMDK_OK;
1446 int64_t cluster_bytes;
1447 uint8_t *whole_grain;
1448 bool copy_from_backing;
1449
1450 /* For COW, align request sector_num to cluster start */
1451 cluster_bytes = extent->cluster_sectors << BDRV_SECTOR_BITS;
1452 offset = QEMU_ALIGN_DOWN(offset, cluster_bytes);
1453 whole_grain = qemu_blockalign(bs, cluster_bytes);
1454 copy_from_backing = bs->backing && !zeroed;
1455
1456 if (!copy_from_backing) {
1457 memset(whole_grain, 0, skip_start_bytes);
1458 memset(whole_grain + skip_end_bytes, 0, cluster_bytes - skip_end_bytes);
1459 }
1460
1461 assert(skip_end_bytes <= cluster_bytes);
1462 /* we will be here if it's first write on non-exist grain(cluster).
1463 * try to read from parent image, if exist */
1464 if (bs->backing && !vmdk_is_cid_valid(bs)) {
1465 ret = VMDK_ERROR;
1466 goto exit;
1467 }
1468
1469 /* Read backing data before skip range */
1470 if (skip_start_bytes > 0) {
1471 if (copy_from_backing) {
1472 /* qcow2 emits this on bs->file instead of bs->backing */
1473 BLKDBG_CO_EVENT(extent->file, BLKDBG_COW_READ);
1474 ret = bdrv_co_pread(bs->backing, offset, skip_start_bytes,
1475 whole_grain, 0);
1476 if (ret < 0) {
1477 ret = VMDK_ERROR;
1478 goto exit;
1479 }
1480 }
1481 BLKDBG_CO_EVENT(extent->file, BLKDBG_COW_WRITE);
1482 ret = bdrv_co_pwrite(extent->file, cluster_offset, skip_start_bytes,
1483 whole_grain, 0);
1484 if (ret < 0) {
1485 ret = VMDK_ERROR;
1486 goto exit;
1487 }
1488 }
1489 /* Read backing data after skip range */
1490 if (skip_end_bytes < cluster_bytes) {
1491 if (copy_from_backing) {
1492 /* qcow2 emits this on bs->file instead of bs->backing */
1493 BLKDBG_CO_EVENT(extent->file, BLKDBG_COW_READ);
1494 ret = bdrv_co_pread(bs->backing, offset + skip_end_bytes,
1495 cluster_bytes - skip_end_bytes,
1496 whole_grain + skip_end_bytes, 0);
1497 if (ret < 0) {
1498 ret = VMDK_ERROR;
1499 goto exit;
1500 }
1501 }
1502 BLKDBG_CO_EVENT(extent->file, BLKDBG_COW_WRITE);
1503 ret = bdrv_co_pwrite(extent->file, cluster_offset + skip_end_bytes,
1504 cluster_bytes - skip_end_bytes,
1505 whole_grain + skip_end_bytes, 0);
1506 if (ret < 0) {
1507 ret = VMDK_ERROR;
1508 goto exit;
1509 }
1510 }
1511
1512 ret = VMDK_OK;
1513 exit:
1514 qemu_vfree(whole_grain);
1515 return ret;
1516 }
1517
1518 static int coroutine_fn GRAPH_RDLOCK
1519 vmdk_L2update(VmdkExtent *extent, VmdkMetaData *m_data, uint32_t offset)
1520 {
1521 offset = cpu_to_le32(offset);
1522 /* update L2 table */
1523 BLKDBG_CO_EVENT(extent->file, BLKDBG_L2_UPDATE);
1524 if (bdrv_co_pwrite(extent->file,
1525 ((int64_t)m_data->l2_offset * 512)
1526 + (m_data->l2_index * sizeof(offset)),
1527 sizeof(offset), &offset, 0) < 0) {
1528 return VMDK_ERROR;
1529 }
1530 /* update backup L2 table */
1531 if (extent->l1_backup_table_offset != 0) {
1532 m_data->l2_offset = extent->l1_backup_table[m_data->l1_index];
1533 if (bdrv_co_pwrite(extent->file,
1534 ((int64_t)m_data->l2_offset * 512)
1535 + (m_data->l2_index * sizeof(offset)),
1536 sizeof(offset), &offset, 0) < 0) {
1537 return VMDK_ERROR;
1538 }
1539 }
1540 if (bdrv_co_flush(extent->file->bs) < 0) {
1541 return VMDK_ERROR;
1542 }
1543 if (m_data->l2_cache_entry) {
1544 *m_data->l2_cache_entry = offset;
1545 }
1546
1547 return VMDK_OK;
1548 }
1549
1550 /**
1551 * get_cluster_offset
1552 *
1553 * Look up cluster offset in extent file by sector number, and store in
1554 * @cluster_offset.
1555 *
1556 * For flat extents, the start offset as parsed from the description file is
1557 * returned.
1558 *
1559 * For sparse extents, look up in L1, L2 table. If allocate is true, return an
1560 * offset for a new cluster and update L2 cache. If there is a backing file,
1561 * COW is done before returning; otherwise, zeroes are written to the allocated
1562 * cluster. Both COW and zero writing skips the sector range
1563 * [@skip_start_sector, @skip_end_sector) passed in by caller, because caller
1564 * has new data to write there.
1565 *
1566 * Returns: VMDK_OK if cluster exists and mapped in the image.
1567 * VMDK_UNALLOC if cluster is not mapped and @allocate is false.
1568 * VMDK_ERROR if failed.
1569 */
1570 static int coroutine_fn GRAPH_RDLOCK
1571 get_cluster_offset(BlockDriverState *bs, VmdkExtent *extent,
1572 VmdkMetaData *m_data, uint64_t offset, bool allocate,
1573 uint64_t *cluster_offset, uint64_t skip_start_bytes,
1574 uint64_t skip_end_bytes)
1575 {
1576 unsigned int l1_index, l2_offset, l2_index;
1577 int min_index, i, j;
1578 uint32_t min_count;
1579 void *l2_table;
1580 bool zeroed = false;
1581 int64_t ret;
1582 int64_t cluster_sector;
1583 unsigned int l2_size_bytes = extent->l2_size * extent->entry_size;
1584
1585 if (m_data) {
1586 m_data->new_allocation = false;
1587 }
1588 if (extent->flat) {
1589 *cluster_offset = extent->flat_start_offset;
1590 return VMDK_OK;
1591 }
1592
1593 offset -= (extent->end_sector - extent->sectors) * SECTOR_SIZE;
1594 l1_index = (offset >> 9) / extent->l1_entry_sectors;
1595 if (l1_index >= extent->l1_size) {
1596 return VMDK_ERROR;
1597 }
1598 if (extent->sesparse) {
1599 uint64_t l2_offset_u64;
1600
1601 assert(extent->entry_size == sizeof(uint64_t));
1602
1603 l2_offset_u64 = ((uint64_t *)extent->l1_table)[l1_index];
1604 if (l2_offset_u64 == 0) {
1605 l2_offset = 0;
1606 } else if ((l2_offset_u64 & 0xffffffff00000000) != 0x1000000000000000) {
1607 /*
1608 * Top most nibble is 0x1 if grain table is allocated.
1609 * strict check - top most 4 bytes must be 0x10000000 since max
1610 * supported size is 64TB for disk - so no more than 64TB / 16MB
1611 * grain directories which is smaller than uint32,
1612 * where 16MB is the only supported default grain table coverage.
1613 */
1614 return VMDK_ERROR;
1615 } else {
1616 l2_offset_u64 = l2_offset_u64 & 0x00000000ffffffff;
1617 l2_offset_u64 = extent->sesparse_l2_tables_offset +
1618 l2_offset_u64 * l2_size_bytes / SECTOR_SIZE;
1619 if (l2_offset_u64 > 0x00000000ffffffff) {
1620 return VMDK_ERROR;
1621 }
1622 l2_offset = (unsigned int)(l2_offset_u64);
1623 }
1624 } else {
1625 assert(extent->entry_size == sizeof(uint32_t));
1626 l2_offset = ((uint32_t *)extent->l1_table)[l1_index];
1627 }
1628 if (!l2_offset) {
1629 return VMDK_UNALLOC;
1630 }
1631 for (i = 0; i < L2_CACHE_SIZE; i++) {
1632 if (l2_offset == extent->l2_cache_offsets[i]) {
1633 /* increment the hit count */
1634 if (++extent->l2_cache_counts[i] == 0xffffffff) {
1635 for (j = 0; j < L2_CACHE_SIZE; j++) {
1636 extent->l2_cache_counts[j] >>= 1;
1637 }
1638 }
1639 l2_table = (char *)extent->l2_cache + (i * l2_size_bytes);
1640 goto found;
1641 }
1642 }
1643 /* not found: load a new entry in the least used one */
1644 min_index = 0;
1645 min_count = 0xffffffff;
1646 for (i = 0; i < L2_CACHE_SIZE; i++) {
1647 if (extent->l2_cache_counts[i] < min_count) {
1648 min_count = extent->l2_cache_counts[i];
1649 min_index = i;
1650 }
1651 }
1652 l2_table = (char *)extent->l2_cache + (min_index * l2_size_bytes);
1653 BLKDBG_CO_EVENT(extent->file, BLKDBG_L2_LOAD);
1654 if (bdrv_co_pread(extent->file,
1655 (int64_t)l2_offset * 512,
1656 l2_size_bytes,
1657 l2_table, 0
1658 ) < 0) {
1659 return VMDK_ERROR;
1660 }
1661
1662 extent->l2_cache_offsets[min_index] = l2_offset;
1663 extent->l2_cache_counts[min_index] = 1;
1664 found:
1665 l2_index = ((offset >> 9) / extent->cluster_sectors) % extent->l2_size;
1666 if (m_data) {
1667 m_data->l1_index = l1_index;
1668 m_data->l2_index = l2_index;
1669 m_data->l2_offset = l2_offset;
1670 m_data->l2_cache_entry = ((uint32_t *)l2_table) + l2_index;
1671 }
1672
1673 if (extent->sesparse) {
1674 cluster_sector = le64_to_cpu(((uint64_t *)l2_table)[l2_index]);
1675 switch (cluster_sector & 0xf000000000000000) {
1676 case 0x0000000000000000:
1677 /* unallocated grain */
1678 if (cluster_sector != 0) {
1679 return VMDK_ERROR;
1680 }
1681 break;
1682 case 0x1000000000000000:
1683 /* scsi-unmapped grain - fallthrough */
1684 case 0x2000000000000000:
1685 /* zero grain */
1686 zeroed = true;
1687 break;
1688 case 0x3000000000000000:
1689 /* allocated grain */
1690 cluster_sector = (((cluster_sector & 0x0fff000000000000) >> 48) |
1691 ((cluster_sector & 0x0000ffffffffffff) << 12));
1692 cluster_sector = extent->sesparse_clusters_offset +
1693 cluster_sector * extent->cluster_sectors;
1694 break;
1695 default:
1696 return VMDK_ERROR;
1697 }
1698 } else {
1699 cluster_sector = le32_to_cpu(((uint32_t *)l2_table)[l2_index]);
1700
1701 if (extent->has_zero_grain && cluster_sector == VMDK_GTE_ZEROED) {
1702 zeroed = true;
1703 }
1704 }
1705
1706 if (!cluster_sector || zeroed) {
1707 if (!allocate) {
1708 return zeroed ? VMDK_ZEROED : VMDK_UNALLOC;
1709 }
1710 assert(!extent->sesparse);
1711
1712 if (extent->next_cluster_sector >= VMDK_EXTENT_MAX_SECTORS) {
1713 return VMDK_ERROR;
1714 }
1715
1716 cluster_sector = extent->next_cluster_sector;
1717 extent->next_cluster_sector += extent->cluster_sectors;
1718
1719 /* First of all we write grain itself, to avoid race condition
1720 * that may to corrupt the image.
1721 * This problem may occur because of insufficient space on host disk
1722 * or inappropriate VM shutdown.
1723 */
1724 ret = get_whole_cluster(bs, extent, cluster_sector * BDRV_SECTOR_SIZE,
1725 offset, skip_start_bytes, skip_end_bytes,
1726 zeroed);
1727 if (ret) {
1728 return ret;
1729 }
1730 if (m_data) {
1731 m_data->new_allocation = true;
1732 }
1733 }
1734 *cluster_offset = cluster_sector << BDRV_SECTOR_BITS;
1735 return VMDK_OK;
1736 }
1737
1738 static VmdkExtent *find_extent(BDRVVmdkState *s,
1739 int64_t sector_num, VmdkExtent *start_hint)
1740 {
1741 VmdkExtent *extent = start_hint;
1742
1743 if (!extent) {
1744 extent = &s->extents[0];
1745 }
1746 while (extent < &s->extents[s->num_extents]) {
1747 if (sector_num < extent->end_sector) {
1748 return extent;
1749 }
1750 extent++;
1751 }
1752 return NULL;
1753 }
1754
1755 static inline uint64_t vmdk_find_offset_in_cluster(VmdkExtent *extent,
1756 int64_t offset)
1757 {
1758 uint64_t extent_begin_offset, extent_relative_offset;
1759 uint64_t cluster_size = extent->cluster_sectors * BDRV_SECTOR_SIZE;
1760
1761 extent_begin_offset =
1762 (extent->end_sector - extent->sectors) * BDRV_SECTOR_SIZE;
1763 extent_relative_offset = offset - extent_begin_offset;
1764 return extent_relative_offset % cluster_size;
1765 }
1766
1767 static int coroutine_fn GRAPH_RDLOCK
1768 vmdk_co_block_status(BlockDriverState *bs, bool want_zero,
1769 int64_t offset, int64_t bytes, int64_t *pnum,
1770 int64_t *map, BlockDriverState **file)
1771 {
1772 BDRVVmdkState *s = bs->opaque;
1773 int64_t index_in_cluster, n, ret;
1774 uint64_t cluster_offset;
1775 VmdkExtent *extent;
1776
1777 extent = find_extent(s, offset >> BDRV_SECTOR_BITS, NULL);
1778 if (!extent) {
1779 return -EIO;
1780 }
1781 qemu_co_mutex_lock(&s->lock);
1782 ret = get_cluster_offset(bs, extent, NULL, offset, false, &cluster_offset,
1783 0, 0);
1784 qemu_co_mutex_unlock(&s->lock);
1785
1786 index_in_cluster = vmdk_find_offset_in_cluster(extent, offset);
1787 switch (ret) {
1788 case VMDK_ERROR:
1789 ret = -EIO;
1790 break;
1791 case VMDK_UNALLOC:
1792 ret = 0;
1793 break;
1794 case VMDK_ZEROED:
1795 ret = BDRV_BLOCK_ZERO;
1796 break;
1797 case VMDK_OK:
1798 ret = BDRV_BLOCK_DATA;
1799 if (!extent->compressed) {
1800 ret |= BDRV_BLOCK_OFFSET_VALID;
1801 *map = cluster_offset + index_in_cluster;
1802 if (extent->flat) {
1803 ret |= BDRV_BLOCK_RECURSE;
1804 }
1805 } else {
1806 ret |= BDRV_BLOCK_COMPRESSED;
1807 }
1808 *file = extent->file->bs;
1809 break;
1810 }
1811
1812 n = extent->cluster_sectors * BDRV_SECTOR_SIZE - index_in_cluster;
1813 *pnum = MIN(n, bytes);
1814 return ret;
1815 }
1816
1817 static int coroutine_fn GRAPH_RDLOCK
1818 vmdk_write_extent(VmdkExtent *extent, int64_t cluster_offset,
1819 int64_t offset_in_cluster, QEMUIOVector *qiov,
1820 uint64_t qiov_offset, uint64_t n_bytes,
1821 uint64_t offset)
1822 {
1823 int ret;
1824 VmdkGrainMarker *data = NULL;
1825 uLongf buf_len;
1826 QEMUIOVector local_qiov;
1827 int64_t write_offset;
1828 int64_t write_end_sector;
1829
1830 if (extent->compressed) {
1831 void *compressed_data;
1832
1833 /* Only whole clusters */
1834 if (offset_in_cluster ||
1835 n_bytes > (extent->cluster_sectors * SECTOR_SIZE) ||
1836 (n_bytes < (extent->cluster_sectors * SECTOR_SIZE) &&
1837 offset + n_bytes != extent->end_sector * SECTOR_SIZE))
1838 {
1839 ret = -EINVAL;
1840 goto out;
1841 }
1842
1843 if (!extent->has_marker) {
1844 ret = -EINVAL;
1845 goto out;
1846 }
1847 buf_len = (extent->cluster_sectors << 9) * 2;
1848 data = g_malloc(buf_len + sizeof(VmdkGrainMarker));
1849
1850 compressed_data = g_malloc(n_bytes);
1851 qemu_iovec_to_buf(qiov, qiov_offset, compressed_data, n_bytes);
1852 ret = compress(data->data, &buf_len, compressed_data, n_bytes);
1853 g_free(compressed_data);
1854
1855 if (ret != Z_OK || buf_len == 0) {
1856 ret = -EINVAL;
1857 goto out;
1858 }
1859
1860 data->lba = cpu_to_le64(offset >> BDRV_SECTOR_BITS);
1861 data->size = cpu_to_le32(buf_len);
1862
1863 n_bytes = buf_len + sizeof(VmdkGrainMarker);
1864 qemu_iovec_init_buf(&local_qiov, data, n_bytes);
1865
1866 BLKDBG_CO_EVENT(extent->file, BLKDBG_WRITE_COMPRESSED);
1867 } else {
1868 qemu_iovec_init(&local_qiov, qiov->niov);
1869 qemu_iovec_concat(&local_qiov, qiov, qiov_offset, n_bytes);
1870
1871 BLKDBG_CO_EVENT(extent->file, BLKDBG_WRITE_AIO);
1872 }
1873
1874 write_offset = cluster_offset + offset_in_cluster;
1875 ret = bdrv_co_pwritev(extent->file, write_offset, n_bytes,
1876 &local_qiov, 0);
1877
1878 write_end_sector = DIV_ROUND_UP(write_offset + n_bytes, BDRV_SECTOR_SIZE);
1879
1880 if (extent->compressed) {
1881 extent->next_cluster_sector = write_end_sector;
1882 } else {
1883 extent->next_cluster_sector = MAX(extent->next_cluster_sector,
1884 write_end_sector);
1885 }
1886
1887 if (ret < 0) {
1888 goto out;
1889 }
1890 ret = 0;
1891 out:
1892 g_free(data);
1893 if (!extent->compressed) {
1894 qemu_iovec_destroy(&local_qiov);
1895 }
1896 return ret;
1897 }
1898
1899 static int coroutine_fn GRAPH_RDLOCK
1900 vmdk_read_extent(VmdkExtent *extent, int64_t cluster_offset,
1901 int64_t offset_in_cluster, QEMUIOVector *qiov, int bytes)
1902 {
1903 int ret;
1904 int cluster_bytes, buf_bytes;
1905 uint8_t *cluster_buf, *compressed_data;
1906 uint8_t *uncomp_buf;
1907 uint32_t data_len;
1908 VmdkGrainMarker *marker;
1909 uLongf buf_len;
1910
1911
1912 if (!extent->compressed) {
1913 BLKDBG_CO_EVENT(extent->file, BLKDBG_READ_AIO);
1914 ret = bdrv_co_preadv(extent->file,
1915 cluster_offset + offset_in_cluster, bytes,
1916 qiov, 0);
1917 if (ret < 0) {
1918 return ret;
1919 }
1920 return 0;
1921 }
1922 cluster_bytes = extent->cluster_sectors * 512;
1923 /* Read two clusters in case GrainMarker + compressed data > one cluster */
1924 buf_bytes = cluster_bytes * 2;
1925 cluster_buf = g_malloc(buf_bytes);
1926 uncomp_buf = g_malloc(cluster_bytes);
1927 BLKDBG_CO_EVENT(extent->file, BLKDBG_READ_COMPRESSED);
1928 ret = bdrv_co_pread(extent->file, cluster_offset, buf_bytes, cluster_buf,
1929 0);
1930 if (ret < 0) {
1931 goto out;
1932 }
1933 compressed_data = cluster_buf;
1934 buf_len = cluster_bytes;
1935 data_len = cluster_bytes;
1936 if (extent->has_marker) {
1937 marker = (VmdkGrainMarker *)cluster_buf;
1938 compressed_data = marker->data;
1939 data_len = le32_to_cpu(marker->size);
1940 }
1941 if (!data_len || data_len > buf_bytes) {
1942 ret = -EINVAL;
1943 goto out;
1944 }
1945 ret = uncompress(uncomp_buf, &buf_len, compressed_data, data_len);
1946 if (ret != Z_OK) {
1947 ret = -EINVAL;
1948 goto out;
1949
1950 }
1951 if (offset_in_cluster < 0 ||
1952 offset_in_cluster + bytes > buf_len) {
1953 ret = -EINVAL;
1954 goto out;
1955 }
1956 qemu_iovec_from_buf(qiov, 0, uncomp_buf + offset_in_cluster, bytes);
1957 ret = 0;
1958
1959 out:
1960 g_free(uncomp_buf);
1961 g_free(cluster_buf);
1962 return ret;
1963 }
1964
1965 static int coroutine_fn GRAPH_RDLOCK
1966 vmdk_co_preadv(BlockDriverState *bs, int64_t offset, int64_t bytes,
1967 QEMUIOVector *qiov, BdrvRequestFlags flags)
1968 {
1969 BDRVVmdkState *s = bs->opaque;
1970 int ret;
1971 uint64_t n_bytes, offset_in_cluster;
1972 VmdkExtent *extent = NULL;
1973 QEMUIOVector local_qiov;
1974 uint64_t cluster_offset;
1975 uint64_t bytes_done = 0;
1976
1977 qemu_iovec_init(&local_qiov, qiov->niov);
1978 qemu_co_mutex_lock(&s->lock);
1979
1980 while (bytes > 0) {
1981 extent = find_extent(s, offset >> BDRV_SECTOR_BITS, extent);
1982 if (!extent) {
1983 ret = -EIO;
1984 goto fail;
1985 }
1986 ret = get_cluster_offset(bs, extent, NULL,
1987 offset, false, &cluster_offset, 0, 0);
1988 offset_in_cluster = vmdk_find_offset_in_cluster(extent, offset);
1989
1990 n_bytes = MIN(bytes, extent->cluster_sectors * BDRV_SECTOR_SIZE
1991 - offset_in_cluster);
1992
1993 if (ret != VMDK_OK) {
1994 /* if not allocated, try to read from parent image, if exist */
1995 if (bs->backing && ret != VMDK_ZEROED) {
1996 if (!vmdk_is_cid_valid(bs)) {
1997 ret = -EINVAL;
1998 goto fail;
1999 }
2000
2001 qemu_iovec_reset(&local_qiov);
2002 qemu_iovec_concat(&local_qiov, qiov, bytes_done, n_bytes);
2003
2004 /* qcow2 emits this on bs->file instead of bs->backing */
2005 BLKDBG_CO_EVENT(bs->file, BLKDBG_READ_BACKING_AIO);
2006 ret = bdrv_co_preadv(bs->backing, offset, n_bytes,
2007 &local_qiov, 0);
2008 if (ret < 0) {
2009 goto fail;
2010 }
2011 } else {
2012 qemu_iovec_memset(qiov, bytes_done, 0, n_bytes);
2013 }
2014 } else {
2015 qemu_iovec_reset(&local_qiov);
2016 qemu_iovec_concat(&local_qiov, qiov, bytes_done, n_bytes);
2017
2018 ret = vmdk_read_extent(extent, cluster_offset, offset_in_cluster,
2019 &local_qiov, n_bytes);
2020 if (ret) {
2021 goto fail;
2022 }
2023 }
2024 bytes -= n_bytes;
2025 offset += n_bytes;
2026 bytes_done += n_bytes;
2027 }
2028
2029 ret = 0;
2030 fail:
2031 qemu_co_mutex_unlock(&s->lock);
2032 qemu_iovec_destroy(&local_qiov);
2033
2034 return ret;
2035 }
2036
2037 /**
2038 * vmdk_write:
2039 * @zeroed: buf is ignored (data is zero), use zeroed_grain GTE feature
2040 * if possible, otherwise return -ENOTSUP.
2041 * @zero_dry_run: used for zeroed == true only, don't update L2 table, just try
2042 * with each cluster. By dry run we can find if the zero write
2043 * is possible without modifying image data.
2044 *
2045 * Returns: error code with 0 for success.
2046 */
2047 static int coroutine_fn GRAPH_RDLOCK
2048 vmdk_pwritev(BlockDriverState *bs, uint64_t offset, uint64_t bytes,
2049 QEMUIOVector *qiov, bool zeroed, bool zero_dry_run)
2050 {
2051 BDRVVmdkState *s = bs->opaque;
2052 VmdkExtent *extent = NULL;
2053 int ret;
2054 int64_t offset_in_cluster, n_bytes;
2055 uint64_t cluster_offset;
2056 uint64_t bytes_done = 0;
2057 VmdkMetaData m_data;
2058
2059 if (DIV_ROUND_UP(offset, BDRV_SECTOR_SIZE) > bs->total_sectors) {
2060 error_report("Wrong offset: offset=0x%" PRIx64
2061 " total_sectors=0x%" PRIx64,
2062 offset, bs->total_sectors);
2063 return -EIO;
2064 }
2065
2066 while (bytes > 0) {
2067 extent = find_extent(s, offset >> BDRV_SECTOR_BITS, extent);
2068 if (!extent) {
2069 return -EIO;
2070 }
2071 if (extent->sesparse) {
2072 return -ENOTSUP;
2073 }
2074 offset_in_cluster = vmdk_find_offset_in_cluster(extent, offset);
2075 n_bytes = MIN(bytes, extent->cluster_sectors * BDRV_SECTOR_SIZE
2076 - offset_in_cluster);
2077
2078 ret = get_cluster_offset(bs, extent, &m_data, offset,
2079 !(extent->compressed || zeroed),
2080 &cluster_offset, offset_in_cluster,
2081 offset_in_cluster + n_bytes);
2082 if (extent->compressed) {
2083 if (ret == VMDK_OK) {
2084 /* Refuse write to allocated cluster for streamOptimized */
2085 error_report("Could not write to allocated cluster"
2086 " for streamOptimized");
2087 return -EIO;
2088 } else if (!zeroed) {
2089 /* allocate */
2090 ret = get_cluster_offset(bs, extent, &m_data, offset,
2091 true, &cluster_offset, 0, 0);
2092 }
2093 }
2094 if (ret == VMDK_ERROR) {
2095 return -EINVAL;
2096 }
2097 if (zeroed) {
2098 /* Do zeroed write, buf is ignored */
2099 if (extent->has_zero_grain &&
2100 offset_in_cluster == 0 &&
2101 n_bytes >= extent->cluster_sectors * BDRV_SECTOR_SIZE) {
2102 n_bytes = extent->cluster_sectors * BDRV_SECTOR_SIZE;
2103 if (!zero_dry_run && ret != VMDK_ZEROED) {
2104 /* update L2 tables */
2105 if (vmdk_L2update(extent, &m_data, VMDK_GTE_ZEROED)
2106 != VMDK_OK) {
2107 return -EIO;
2108 }
2109 }
2110 } else {
2111 return -ENOTSUP;
2112 }
2113 } else {
2114 ret = vmdk_write_extent(extent, cluster_offset, offset_in_cluster,
2115 qiov, bytes_done, n_bytes, offset);
2116 if (ret) {
2117 return ret;
2118 }
2119 if (m_data.new_allocation) {
2120 /* update L2 tables */
2121 if (vmdk_L2update(extent, &m_data,
2122 cluster_offset >> BDRV_SECTOR_BITS)
2123 != VMDK_OK) {
2124 return -EIO;
2125 }
2126 }
2127 }
2128 bytes -= n_bytes;
2129 offset += n_bytes;
2130 bytes_done += n_bytes;
2131
2132 /* update CID on the first write every time the virtual disk is
2133 * opened */
2134 if (!s->cid_updated) {
2135 ret = vmdk_write_cid(bs, g_random_int());
2136 if (ret < 0) {
2137 return ret;
2138 }
2139 s->cid_updated = true;
2140 }
2141 }
2142 return 0;
2143 }
2144
2145 static int coroutine_fn GRAPH_RDLOCK
2146 vmdk_co_pwritev(BlockDriverState *bs, int64_t offset, int64_t bytes,
2147 QEMUIOVector *qiov, BdrvRequestFlags flags)
2148 {
2149 int ret;
2150 BDRVVmdkState *s = bs->opaque;
2151 qemu_co_mutex_lock(&s->lock);
2152 ret = vmdk_pwritev(bs, offset, bytes, qiov, false, false);
2153 qemu_co_mutex_unlock(&s->lock);
2154 return ret;
2155 }
2156
2157 static int coroutine_fn GRAPH_RDLOCK
2158 vmdk_co_pwritev_compressed(BlockDriverState *bs, int64_t offset, int64_t bytes,
2159 QEMUIOVector *qiov)
2160 {
2161 if (bytes == 0) {
2162 /* The caller will write bytes 0 to signal EOF.
2163 * When receive it, we align EOF to a sector boundary. */
2164 BDRVVmdkState *s = bs->opaque;
2165 int i, ret;
2166 int64_t length;
2167
2168 for (i = 0; i < s->num_extents; i++) {
2169 length = bdrv_co_getlength(s->extents[i].file->bs);
2170 if (length < 0) {
2171 return length;
2172 }
2173 length = QEMU_ALIGN_UP(length, BDRV_SECTOR_SIZE);
2174 ret = bdrv_co_truncate(s->extents[i].file, length, false,
2175 PREALLOC_MODE_OFF, 0, NULL);
2176 if (ret < 0) {
2177 return ret;
2178 }
2179 }
2180 return 0;
2181 }
2182 return vmdk_co_pwritev(bs, offset, bytes, qiov, 0);
2183 }
2184
2185 static int coroutine_fn GRAPH_RDLOCK
2186 vmdk_co_pwrite_zeroes(BlockDriverState *bs, int64_t offset, int64_t bytes,
2187 BdrvRequestFlags flags)
2188 {
2189 int ret;
2190 BDRVVmdkState *s = bs->opaque;
2191
2192 qemu_co_mutex_lock(&s->lock);
2193 /* write zeroes could fail if sectors not aligned to cluster, test it with
2194 * dry_run == true before really updating image */
2195 ret = vmdk_pwritev(bs, offset, bytes, NULL, true, true);
2196 if (!ret) {
2197 ret = vmdk_pwritev(bs, offset, bytes, NULL, true, false);
2198 }
2199 qemu_co_mutex_unlock(&s->lock);
2200 return ret;
2201 }
2202
2203 static int coroutine_fn GRAPH_UNLOCKED
2204 vmdk_init_extent(BlockBackend *blk, int64_t filesize, bool flat, bool compress,
2205 bool zeroed_grain, Error **errp)
2206 {
2207 int ret, i;
2208 VMDK4Header header;
2209 uint32_t tmp, magic, grains, gd_sectors, gt_size, gt_count;
2210 uint32_t *gd_buf = NULL;
2211 int gd_buf_size;
2212
2213 if (flat) {
2214 ret = blk_co_truncate(blk, filesize, false, PREALLOC_MODE_OFF, 0, errp);
2215 goto exit;
2216 }
2217 magic = cpu_to_be32(VMDK4_MAGIC);
2218 memset(&header, 0, sizeof(header));
2219 if (compress) {
2220 header.version = 3;
2221 } else if (zeroed_grain) {
2222 header.version = 2;
2223 } else {
2224 header.version = 1;
2225 }
2226 header.flags = VMDK4_FLAG_RGD | VMDK4_FLAG_NL_DETECT
2227 | (compress ? VMDK4_FLAG_COMPRESS | VMDK4_FLAG_MARKER : 0)
2228 | (zeroed_grain ? VMDK4_FLAG_ZERO_GRAIN : 0);
2229 header.compressAlgorithm = compress ? VMDK4_COMPRESSION_DEFLATE : 0;
2230 header.capacity = filesize / BDRV_SECTOR_SIZE;
2231 header.granularity = 128;
2232 header.num_gtes_per_gt = BDRV_SECTOR_SIZE;
2233
2234 grains = DIV_ROUND_UP(filesize / BDRV_SECTOR_SIZE, header.granularity);
2235 gt_size = DIV_ROUND_UP(header.num_gtes_per_gt * sizeof(uint32_t),
2236 BDRV_SECTOR_SIZE);
2237 gt_count = DIV_ROUND_UP(grains, header.num_gtes_per_gt);
2238 gd_sectors = DIV_ROUND_UP(gt_count * sizeof(uint32_t), BDRV_SECTOR_SIZE);
2239
2240 header.desc_offset = 1;
2241 header.desc_size = 20;
2242 header.rgd_offset = header.desc_offset + header.desc_size;
2243 header.gd_offset = header.rgd_offset + gd_sectors + (gt_size * gt_count);
2244 header.grain_offset =
2245 ROUND_UP(header.gd_offset + gd_sectors + (gt_size * gt_count),
2246 header.granularity);
2247 /* swap endianness for all header fields */
2248 header.version = cpu_to_le32(header.version);
2249 header.flags = cpu_to_le32(header.flags);
2250 header.capacity = cpu_to_le64(header.capacity);
2251 header.granularity = cpu_to_le64(header.granularity);
2252 header.num_gtes_per_gt = cpu_to_le32(header.num_gtes_per_gt);
2253 header.desc_offset = cpu_to_le64(header.desc_offset);
2254 header.desc_size = cpu_to_le64(header.desc_size);
2255 header.rgd_offset = cpu_to_le64(header.rgd_offset);
2256 header.gd_offset = cpu_to_le64(header.gd_offset);
2257 header.grain_offset = cpu_to_le64(header.grain_offset);
2258 header.compressAlgorithm = cpu_to_le16(header.compressAlgorithm);
2259
2260 header.check_bytes[0] = 0xa;
2261 header.check_bytes[1] = 0x20;
2262 header.check_bytes[2] = 0xd;
2263 header.check_bytes[3] = 0xa;
2264
2265 /* write all the data */
2266 ret = blk_co_pwrite(blk, 0, sizeof(magic), &magic, 0);
2267 if (ret < 0) {
2268 error_setg(errp, QERR_IO_ERROR);
2269 goto exit;
2270 }
2271 ret = blk_co_pwrite(blk, sizeof(magic), sizeof(header), &header, 0);
2272 if (ret < 0) {
2273 error_setg(errp, QERR_IO_ERROR);
2274 goto exit;
2275 }
2276
2277 ret = blk_co_truncate(blk, le64_to_cpu(header.grain_offset) << 9, false,
2278 PREALLOC_MODE_OFF, 0, errp);
2279 if (ret < 0) {
2280 goto exit;
2281 }
2282
2283 /* write grain directory */
2284 gd_buf_size = gd_sectors * BDRV_SECTOR_SIZE;
2285 gd_buf = g_malloc0(gd_buf_size);
2286 for (i = 0, tmp = le64_to_cpu(header.rgd_offset) + gd_sectors;
2287 i < gt_count; i++, tmp += gt_size) {
2288 gd_buf[i] = cpu_to_le32(tmp);
2289 }
2290 ret = blk_co_pwrite(blk, le64_to_cpu(header.rgd_offset) * BDRV_SECTOR_SIZE,
2291 gd_buf_size, gd_buf, 0);
2292 if (ret < 0) {
2293 error_setg(errp, QERR_IO_ERROR);
2294 goto exit;
2295 }
2296
2297 /* write backup grain directory */
2298 for (i = 0, tmp = le64_to_cpu(header.gd_offset) + gd_sectors;
2299 i < gt_count; i++, tmp += gt_size) {
2300 gd_buf[i] = cpu_to_le32(tmp);
2301 }
2302 ret = blk_co_pwrite(blk, le64_to_cpu(header.gd_offset) * BDRV_SECTOR_SIZE,
2303 gd_buf_size, gd_buf, 0);
2304 if (ret < 0) {
2305 error_setg(errp, QERR_IO_ERROR);
2306 }
2307
2308 ret = 0;
2309 exit:
2310 g_free(gd_buf);
2311 return ret;
2312 }
2313
2314 static int coroutine_fn GRAPH_UNLOCKED
2315 vmdk_create_extent(const char *filename, int64_t filesize, bool flat,
2316 bool compress, bool zeroed_grain, BlockBackend **pbb,
2317 QemuOpts *opts, Error **errp)
2318 {
2319 int ret;
2320 BlockBackend *blk = NULL;
2321
2322 ret = bdrv_co_create_file(filename, opts, errp);
2323 if (ret < 0) {
2324 goto exit;
2325 }
2326
2327 blk = blk_co_new_open(filename, NULL, NULL,
2328 BDRV_O_RDWR | BDRV_O_RESIZE | BDRV_O_PROTOCOL,
2329 errp);
2330 if (blk == NULL) {
2331 ret = -EIO;
2332 goto exit;
2333 }
2334
2335 blk_set_allow_write_beyond_eof(blk, true);
2336
2337 ret = vmdk_init_extent(blk, filesize, flat, compress, zeroed_grain, errp);
2338 exit:
2339 if (blk) {
2340 if (pbb) {
2341 *pbb = blk;
2342 } else {
2343 blk_co_unref(blk);
2344 blk = NULL;
2345 }
2346 }
2347 return ret;
2348 }
2349
2350 static int filename_decompose(const char *filename, char *path, char *prefix,
2351 char *postfix, size_t buf_len, Error **errp)
2352 {
2353 const char *p, *q;
2354
2355 if (filename == NULL || !strlen(filename)) {
2356 error_setg(errp, "No filename provided");
2357 return VMDK_ERROR;
2358 }
2359 p = strrchr(filename, '/');
2360 if (p == NULL) {
2361 p = strrchr(filename, '\\');
2362 }
2363 if (p == NULL) {
2364 p = strrchr(filename, ':');
2365 }
2366 if (p != NULL) {
2367 p++;
2368 if (p - filename >= buf_len) {
2369 return VMDK_ERROR;
2370 }
2371 pstrcpy(path, p - filename + 1, filename);
2372 } else {
2373 p = filename;
2374 path[0] = '\0';
2375 }
2376 q = strrchr(p, '.');
2377 if (q == NULL) {
2378 pstrcpy(prefix, buf_len, p);
2379 postfix[0] = '\0';
2380 } else {
2381 if (q - p >= buf_len) {
2382 return VMDK_ERROR;
2383 }
2384 pstrcpy(prefix, q - p + 1, p);
2385 pstrcpy(postfix, buf_len, q);
2386 }
2387 return VMDK_OK;
2388 }
2389
2390 /*
2391 * idx == 0: get or create the descriptor file (also the image file if in a
2392 * non-split format.
2393 * idx >= 1: get the n-th extent if in a split subformat
2394 */
2395 typedef BlockBackend * coroutine_fn GRAPH_UNLOCKED_PTR
2396 (*vmdk_create_extent_fn)(int64_t size, int idx, bool flat, bool split,
2397 bool compress, bool zeroed_grain, void *opaque,
2398 Error **errp);
2399
2400 static void vmdk_desc_add_extent(GString *desc,
2401 const char *extent_line_fmt,
2402 int64_t size, const char *filename)
2403 {
2404 char *basename = g_path_get_basename(filename);
2405
2406 g_string_append_printf(desc, extent_line_fmt,
2407 DIV_ROUND_UP(size, BDRV_SECTOR_SIZE), basename);
2408 g_free(basename);
2409 }
2410
2411 static int coroutine_fn GRAPH_UNLOCKED
2412 vmdk_co_do_create(int64_t size,
2413 BlockdevVmdkSubformat subformat,
2414 BlockdevVmdkAdapterType adapter_type,
2415 const char *backing_file,
2416 const char *hw_version,
2417 const char *toolsversion,
2418 bool compat6,
2419 bool zeroed_grain,
2420 vmdk_create_extent_fn extent_fn,
2421 void *opaque,
2422 Error **errp)
2423 {
2424 int extent_idx;
2425 BlockBackend *blk = NULL;
2426 BlockBackend *extent_blk;
2427 Error *local_err = NULL;
2428 char *desc = NULL;
2429 int ret = 0;
2430 bool flat, split, compress;
2431 GString *ext_desc_lines;
2432 const int64_t split_size = 0x80000000; /* VMDK has constant split size */
2433 int64_t extent_size;
2434 int64_t created_size = 0;
2435 const char *extent_line_fmt;
2436 char *parent_desc_line = g_malloc0(BUF_SIZE);
2437 uint32_t parent_cid = 0xffffffff;
2438 uint32_t number_heads = 16;
2439 uint32_t desc_offset = 0, desc_len;
2440 const char desc_template[] =
2441 "# Disk DescriptorFile\n"
2442 "version=1\n"
2443 "CID=%" PRIx32 "\n"
2444 "parentCID=%" PRIx32 "\n"
2445 "createType=\"%s\"\n"
2446 "%s"
2447 "\n"
2448 "# Extent description\n"
2449 "%s"
2450 "\n"
2451 "# The Disk Data Base\n"
2452 "#DDB\n"
2453 "\n"
2454 "ddb.virtualHWVersion = \"%s\"\n"
2455 "ddb.geometry.cylinders = \"%" PRId64 "\"\n"
2456 "ddb.geometry.heads = \"%" PRIu32 "\"\n"
2457 "ddb.geometry.sectors = \"63\"\n"
2458 "ddb.adapterType = \"%s\"\n"
2459 "ddb.toolsVersion = \"%s\"\n";
2460
2461 ext_desc_lines = g_string_new(NULL);
2462
2463 /* Read out options */
2464 if (compat6) {
2465 if (hw_version) {
2466 error_setg(errp,
2467 "compat6 cannot be enabled with hwversion set");
2468 ret = -EINVAL;
2469 goto exit;
2470 }
2471 hw_version = "6";
2472 }
2473 if (!hw_version) {
2474 hw_version = "4";
2475 }
2476 if (!toolsversion) {
2477 toolsversion = "2147483647";
2478 }
2479
2480 if (adapter_type != BLOCKDEV_VMDK_ADAPTER_TYPE_IDE) {
2481 /* that's the number of heads with which vmware operates when
2482 creating, exporting, etc. vmdk files with a non-ide adapter type */
2483 number_heads = 255;
2484 }
2485 split = (subformat == BLOCKDEV_VMDK_SUBFORMAT_TWOGBMAXEXTENTFLAT) ||
2486 (subformat == BLOCKDEV_VMDK_SUBFORMAT_TWOGBMAXEXTENTSPARSE);
2487 flat = (subformat == BLOCKDEV_VMDK_SUBFORMAT_MONOLITHICFLAT) ||
2488 (subformat == BLOCKDEV_VMDK_SUBFORMAT_TWOGBMAXEXTENTFLAT);
2489 compress = subformat == BLOCKDEV_VMDK_SUBFORMAT_STREAMOPTIMIZED;
2490
2491 if (flat) {
2492 extent_line_fmt = "RW %" PRId64 " FLAT \"%s\" 0\n";
2493 } else {
2494 extent_line_fmt = "RW %" PRId64 " SPARSE \"%s\"\n";
2495 }
2496 if (flat && backing_file) {
2497 error_setg(errp, "Flat image can't have backing file");
2498 ret = -ENOTSUP;
2499 goto exit;
2500 }
2501 if (flat && zeroed_grain) {
2502 error_setg(errp, "Flat image can't enable zeroed grain");
2503 ret = -ENOTSUP;
2504 goto exit;
2505 }
2506
2507 /* Create extents */
2508 if (split) {
2509 extent_size = split_size;
2510 } else {
2511 extent_size = size;
2512 }
2513 if (!split && !flat) {
2514 created_size = extent_size;
2515 } else {
2516 created_size = 0;
2517 }
2518 /* Get the descriptor file BDS */
2519 blk = extent_fn(created_size, 0, flat, split, compress, zeroed_grain,
2520 opaque, errp);
2521 if (!blk) {
2522 ret = -EIO;
2523 goto exit;
2524 }
2525 if (!split && !flat) {
2526 vmdk_desc_add_extent(ext_desc_lines, extent_line_fmt, created_size,
2527 blk_bs(blk)->filename);
2528 }
2529
2530 if (backing_file) {
2531 BlockBackend *backing;
2532 char *full_backing =
2533 bdrv_get_full_backing_filename_from_filename(blk_bs(blk)->filename,
2534 backing_file,
2535 &local_err);
2536 if (local_err) {
2537 error_propagate(errp, local_err);
2538 ret = -ENOENT;
2539 goto exit;
2540 }
2541 assert(full_backing);
2542
2543 backing = blk_co_new_open(full_backing, NULL, NULL,
2544 BDRV_O_NO_BACKING, errp);
2545 g_free(full_backing);
2546 if (backing == NULL) {
2547 ret = -EIO;
2548 goto exit;
2549 }
2550 if (strcmp(blk_bs(backing)->drv->format_name, "vmdk")) {
2551 error_setg(errp, "Invalid backing file format: %s. Must be vmdk",
2552 blk_bs(backing)->drv->format_name);
2553 blk_co_unref(backing);
2554 ret = -EINVAL;
2555 goto exit;
2556 }
2557
2558 bdrv_graph_co_rdlock();
2559 ret = vmdk_read_cid(blk_bs(backing), 0, &parent_cid);
2560 bdrv_graph_co_rdunlock();
2561 blk_co_unref(backing);
2562 if (ret) {
2563 error_setg(errp, "Failed to read parent CID");
2564 goto exit;
2565 }
2566 snprintf(parent_desc_line, BUF_SIZE,
2567 "parentFileNameHint=\"%s\"", backing_file);
2568 }
2569 extent_idx = 1;
2570 while (created_size < size) {
2571 int64_t cur_size = MIN(size - created_size, extent_size);
2572 extent_blk = extent_fn(cur_size, extent_idx, flat, split, compress,
2573 zeroed_grain, opaque, errp);
2574 if (!extent_blk) {
2575 ret = -EINVAL;
2576 goto exit;
2577 }
2578 vmdk_desc_add_extent(ext_desc_lines, extent_line_fmt, cur_size,
2579 blk_bs(extent_blk)->filename);
2580 created_size += cur_size;
2581 extent_idx++;
2582 blk_co_unref(extent_blk);
2583 }
2584
2585 /* Check whether we got excess extents */
2586 extent_blk = extent_fn(-1, extent_idx, flat, split, compress, zeroed_grain,
2587 opaque, NULL);
2588 if (extent_blk) {
2589 blk_co_unref(extent_blk);
2590 error_setg(errp, "List of extents contains unused extents");
2591 ret = -EINVAL;
2592 goto exit;
2593 }
2594
2595 /* generate descriptor file */
2596 desc = g_strdup_printf(desc_template,
2597 g_random_int(),
2598 parent_cid,
2599 BlockdevVmdkSubformat_str(subformat),
2600 parent_desc_line,
2601 ext_desc_lines->str,
2602 hw_version,
2603 size /
2604 (int64_t)(63 * number_heads * BDRV_SECTOR_SIZE),
2605 number_heads,
2606 BlockdevVmdkAdapterType_str(adapter_type),
2607 toolsversion);
2608 desc_len = strlen(desc);
2609 /* the descriptor offset = 0x200 */
2610 if (!split && !flat) {
2611 desc_offset = 0x200;
2612 }
2613
2614 ret = blk_co_pwrite(blk, desc_offset, desc_len, desc, 0);
2615 if (ret < 0) {
2616 error_setg_errno(errp, -ret, "Could not write description");
2617 goto exit;
2618 }
2619 /* bdrv_pwrite write padding zeros to align to sector, we don't need that
2620 * for description file */
2621 if (desc_offset == 0) {
2622 ret = blk_co_truncate(blk, desc_len, false, PREALLOC_MODE_OFF, 0, errp);
2623 if (ret < 0) {
2624 goto exit;
2625 }
2626 }
2627 ret = 0;
2628 exit:
2629 if (blk) {
2630 blk_co_unref(blk);
2631 }
2632 g_free(desc);
2633 g_free(parent_desc_line);
2634 g_string_free(ext_desc_lines, true);
2635 return ret;
2636 }
2637
2638 typedef struct {
2639 char *path;
2640 char *prefix;
2641 char *postfix;
2642 QemuOpts *opts;
2643 } VMDKCreateOptsData;
2644
2645 static BlockBackend * coroutine_fn GRAPH_UNLOCKED
2646 vmdk_co_create_opts_cb(int64_t size, int idx, bool flat, bool split,
2647 bool compress, bool zeroed_grain, void *opaque,
2648 Error **errp)
2649 {
2650 BlockBackend *blk = NULL;
2651 BlockDriverState *bs = NULL;
2652 VMDKCreateOptsData *data = opaque;
2653 char *ext_filename = NULL;
2654 char *rel_filename = NULL;
2655
2656 /* We're done, don't create excess extents. */
2657 if (size == -1) {
2658 assert(errp == NULL);
2659 return NULL;
2660 }
2661
2662 if (idx == 0) {
2663 rel_filename = g_strdup_printf("%s%s", data->prefix, data->postfix);
2664 } else if (split) {
2665 rel_filename = g_strdup_printf("%s-%c%03d%s",
2666 data->prefix,
2667 flat ? 'f' : 's', idx, data->postfix);
2668 } else {
2669 assert(idx == 1);
2670 rel_filename = g_strdup_printf("%s-flat%s", data->prefix, data->postfix);
2671 }
2672
2673 ext_filename = g_strdup_printf("%s%s", data->path, rel_filename);
2674 g_free(rel_filename);
2675
2676 if (vmdk_create_extent(ext_filename, size,
2677 flat, compress, zeroed_grain, &blk, data->opts,
2678 errp)) {
2679 goto exit;
2680 }
2681 bdrv_co_unref(bs);
2682 exit:
2683 g_free(ext_filename);
2684 return blk;
2685 }
2686
2687 static int coroutine_fn GRAPH_UNLOCKED
2688 vmdk_co_create_opts(BlockDriver *drv, const char *filename,
2689 QemuOpts *opts, Error **errp)
2690 {
2691 Error *local_err = NULL;
2692 char *desc = NULL;
2693 int64_t total_size = 0;
2694 char *adapter_type = NULL;
2695 BlockdevVmdkAdapterType adapter_type_enum;
2696 char *backing_file = NULL;
2697 char *hw_version = NULL;
2698 char *toolsversion = NULL;
2699 char *fmt = NULL;
2700 BlockdevVmdkSubformat subformat;
2701 int ret = 0;
2702 char *path = g_malloc0(PATH_MAX);
2703 char *prefix = g_malloc0(PATH_MAX);
2704 char *postfix = g_malloc0(PATH_MAX);
2705 char *desc_line = g_malloc0(BUF_SIZE);
2706 char *ext_filename = g_malloc0(PATH_MAX);
2707 char *desc_filename = g_malloc0(PATH_MAX);
2708 char *parent_desc_line = g_malloc0(BUF_SIZE);
2709 bool zeroed_grain;
2710 bool compat6;
2711 VMDKCreateOptsData data;
2712 char *backing_fmt = NULL;
2713
2714 backing_fmt = qemu_opt_get_del(opts, BLOCK_OPT_BACKING_FMT);
2715 if (backing_fmt && strcmp(backing_fmt, "vmdk") != 0) {
2716 error_setg(errp, "backing_file must be a vmdk image");
2717 ret = -EINVAL;
2718 goto exit;
2719 }
2720
2721 if (filename_decompose(filename, path, prefix, postfix, PATH_MAX, errp)) {
2722 ret = -EINVAL;
2723 goto exit;
2724 }
2725 /* Read out options */
2726 total_size = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0),
2727 BDRV_SECTOR_SIZE);
2728 adapter_type = qemu_opt_get_del(opts, BLOCK_OPT_ADAPTER_TYPE);
2729 backing_file = qemu_opt_get_del(opts, BLOCK_OPT_BACKING_FILE);
2730 hw_version = qemu_opt_get_del(opts, BLOCK_OPT_HWVERSION);
2731 toolsversion = qemu_opt_get_del(opts, BLOCK_OPT_TOOLSVERSION);
2732 compat6 = qemu_opt_get_bool_del(opts, BLOCK_OPT_COMPAT6, false);
2733 if (strcmp(hw_version, "undefined") == 0) {
2734 g_free(hw_version);
2735 hw_version = NULL;
2736 }
2737 fmt = qemu_opt_get_del(opts, BLOCK_OPT_SUBFMT);
2738 zeroed_grain = qemu_opt_get_bool_del(opts, BLOCK_OPT_ZEROED_GRAIN, false);
2739
2740 if (adapter_type) {
2741 adapter_type_enum = qapi_enum_parse(&BlockdevVmdkAdapterType_lookup,
2742 adapter_type,
2743 BLOCKDEV_VMDK_ADAPTER_TYPE_IDE,
2744 &local_err);
2745 if (local_err) {
2746 error_propagate(errp, local_err);
2747 ret = -EINVAL;
2748 goto exit;
2749 }
2750 } else {
2751 adapter_type_enum = BLOCKDEV_VMDK_ADAPTER_TYPE_IDE;
2752 }
2753
2754 if (!fmt) {
2755 /* Default format to monolithicSparse */
2756 subformat = BLOCKDEV_VMDK_SUBFORMAT_MONOLITHICSPARSE;
2757 } else {
2758 subformat = qapi_enum_parse(&BlockdevVmdkSubformat_lookup,
2759 fmt,
2760 BLOCKDEV_VMDK_SUBFORMAT_MONOLITHICSPARSE,
2761 &local_err);
2762 if (local_err) {
2763 error_propagate(errp, local_err);
2764 ret = -EINVAL;
2765 goto exit;
2766 }
2767 }
2768 data = (VMDKCreateOptsData){
2769 .prefix = prefix,
2770 .postfix = postfix,
2771 .path = path,
2772 .opts = opts,
2773 };
2774 ret = vmdk_co_do_create(total_size, subformat, adapter_type_enum,
2775 backing_file, hw_version, toolsversion, compat6,
2776 zeroed_grain, vmdk_co_create_opts_cb, &data, errp);
2777
2778 exit:
2779 g_free(backing_fmt);
2780 g_free(adapter_type);
2781 g_free(backing_file);
2782 g_free(hw_version);
2783 g_free(toolsversion);
2784 g_free(fmt);
2785 g_free(desc);
2786 g_free(path);
2787 g_free(prefix);
2788 g_free(postfix);
2789 g_free(desc_line);
2790 g_free(ext_filename);
2791 g_free(desc_filename);
2792 g_free(parent_desc_line);
2793 return ret;
2794 }
2795
2796 static BlockBackend * coroutine_fn GRAPH_UNLOCKED
2797 vmdk_co_create_cb(int64_t size, int idx, bool flat, bool split, bool compress,
2798 bool zeroed_grain, void *opaque, Error **errp)
2799 {
2800 int ret;
2801 BlockDriverState *bs;
2802 BlockBackend *blk;
2803 BlockdevCreateOptionsVmdk *opts = opaque;
2804
2805 if (idx == 0) {
2806 bs = bdrv_co_open_blockdev_ref(opts->file, errp);
2807 } else {
2808 int i;
2809 BlockdevRefList *list = opts->extents;
2810 for (i = 1; i < idx; i++) {
2811 if (!list || !list->next) {
2812 error_setg(errp, "Extent [%d] not specified", i);
2813 return NULL;
2814 }
2815 list = list->next;
2816 }
2817 if (!list) {
2818 error_setg(errp, "Extent [%d] not specified", idx - 1);
2819 return NULL;
2820 }
2821 bs = bdrv_co_open_blockdev_ref(list->value, errp);
2822 }
2823 if (!bs) {
2824 return NULL;
2825 }
2826 blk = blk_co_new_with_bs(bs,
2827 BLK_PERM_CONSISTENT_READ | BLK_PERM_WRITE |
2828 BLK_PERM_RESIZE,
2829 BLK_PERM_ALL,
2830 errp);
2831 if (!blk) {
2832 return NULL;
2833 }
2834 blk_set_allow_write_beyond_eof(blk, true);
2835 bdrv_co_unref(bs);
2836
2837 if (size != -1) {
2838 ret = vmdk_init_extent(blk, size, flat, compress, zeroed_grain, errp);
2839 if (ret) {
2840 blk_co_unref(blk);
2841 blk = NULL;
2842 }
2843 }
2844 return blk;
2845 }
2846
2847 static int coroutine_fn GRAPH_UNLOCKED
2848 vmdk_co_create(BlockdevCreateOptions *create_options, Error **errp)
2849 {
2850 BlockdevCreateOptionsVmdk *opts;
2851
2852 opts = &create_options->u.vmdk;
2853
2854 /* Validate options */
2855 if (!QEMU_IS_ALIGNED(opts->size, BDRV_SECTOR_SIZE)) {
2856 error_setg(errp, "Image size must be a multiple of 512 bytes");
2857 return -EINVAL;
2858 }
2859
2860 return vmdk_co_do_create(opts->size,
2861 opts->subformat,
2862 opts->adapter_type,
2863 opts->backing_file,
2864 opts->hwversion,
2865 opts->toolsversion,
2866 false,
2867 opts->zeroed_grain,
2868 vmdk_co_create_cb,
2869 opts, errp);
2870 }
2871
2872 static void vmdk_close(BlockDriverState *bs)
2873 {
2874 BDRVVmdkState *s = bs->opaque;
2875
2876 vmdk_free_extents(bs);
2877 g_free(s->create_type);
2878
2879 migrate_del_blocker(&s->migration_blocker);
2880 }
2881
2882 static int64_t coroutine_fn GRAPH_RDLOCK
2883 vmdk_co_get_allocated_file_size(BlockDriverState *bs)
2884 {
2885 int i;
2886 int64_t ret = 0;
2887 int64_t r;
2888 BDRVVmdkState *s = bs->opaque;
2889
2890 ret = bdrv_co_get_allocated_file_size(bs->file->bs);
2891 if (ret < 0) {
2892 return ret;
2893 }
2894 for (i = 0; i < s->num_extents; i++) {
2895 if (s->extents[i].file == bs->file) {
2896 continue;
2897 }
2898 r = bdrv_co_get_allocated_file_size(s->extents[i].file->bs);
2899 if (r < 0) {
2900 return r;
2901 }
2902 ret += r;
2903 }
2904 return ret;
2905 }
2906
2907 static int GRAPH_RDLOCK vmdk_has_zero_init(BlockDriverState *bs)
2908 {
2909 int i;
2910 BDRVVmdkState *s = bs->opaque;
2911
2912 /* If has a flat extent and its underlying storage doesn't have zero init,
2913 * return 0. */
2914 for (i = 0; i < s->num_extents; i++) {
2915 if (s->extents[i].flat) {
2916 if (!bdrv_has_zero_init(s->extents[i].file->bs)) {
2917 return 0;
2918 }
2919 }
2920 }
2921 return 1;
2922 }
2923
2924 static VmdkExtentInfo * GRAPH_RDLOCK vmdk_get_extent_info(VmdkExtent *extent)
2925 {
2926 VmdkExtentInfo *info = g_new0(VmdkExtentInfo, 1);
2927
2928 bdrv_refresh_filename(extent->file->bs);
2929 *info = (VmdkExtentInfo){
2930 .filename = g_strdup(extent->file->bs->filename),
2931 .format = g_strdup(extent->type),
2932 .virtual_size = extent->sectors * BDRV_SECTOR_SIZE,
2933 .compressed = extent->compressed,
2934 .has_compressed = extent->compressed,
2935 .cluster_size = extent->cluster_sectors * BDRV_SECTOR_SIZE,
2936 .has_cluster_size = !extent->flat,
2937 };
2938
2939 return info;
2940 }
2941
2942 static int coroutine_fn GRAPH_RDLOCK
2943 vmdk_co_check(BlockDriverState *bs, BdrvCheckResult *result, BdrvCheckMode fix)
2944 {
2945 BDRVVmdkState *s = bs->opaque;
2946 VmdkExtent *extent = NULL;
2947 int64_t sector_num = 0;
2948 int64_t total_sectors = bdrv_co_nb_sectors(bs);
2949 int ret;
2950 uint64_t cluster_offset;
2951
2952 if (fix) {
2953 return -ENOTSUP;
2954 }
2955
2956 for (;;) {
2957 if (sector_num >= total_sectors) {
2958 return 0;
2959 }
2960 extent = find_extent(s, sector_num, extent);
2961 if (!extent) {
2962 fprintf(stderr,
2963 "ERROR: could not find extent for sector %" PRId64 "\n",
2964 sector_num);
2965 ret = -EINVAL;
2966 break;
2967 }
2968 ret = get_cluster_offset(bs, extent, NULL,
2969 sector_num << BDRV_SECTOR_BITS,
2970 false, &cluster_offset, 0, 0);
2971 if (ret == VMDK_ERROR) {
2972 fprintf(stderr,
2973 "ERROR: could not get cluster_offset for sector %"
2974 PRId64 "\n", sector_num);
2975 break;
2976 }
2977 if (ret == VMDK_OK) {
2978 int64_t extent_len = bdrv_co_getlength(extent->file->bs);
2979 if (extent_len < 0) {
2980 fprintf(stderr,
2981 "ERROR: could not get extent file length for sector %"
2982 PRId64 "\n", sector_num);
2983 ret = extent_len;
2984 break;
2985 }
2986 if (cluster_offset >= extent_len) {
2987 fprintf(stderr,
2988 "ERROR: cluster offset for sector %"
2989 PRId64 " points after EOF\n", sector_num);
2990 ret = -EINVAL;
2991 break;
2992 }
2993 }
2994 sector_num += extent->cluster_sectors;
2995 }
2996
2997 result->corruptions++;
2998 return ret;
2999 }
3000
3001 static ImageInfoSpecific * GRAPH_RDLOCK
3002 vmdk_get_specific_info(BlockDriverState *bs, Error **errp)
3003 {
3004 int i;
3005 BDRVVmdkState *s = bs->opaque;
3006 ImageInfoSpecific *spec_info = g_new0(ImageInfoSpecific, 1);
3007 VmdkExtentInfoList **tail;
3008
3009 *spec_info = (ImageInfoSpecific){
3010 .type = IMAGE_INFO_SPECIFIC_KIND_VMDK,
3011 .u = {
3012 .vmdk.data = g_new0(ImageInfoSpecificVmdk, 1),
3013 },
3014 };
3015
3016 *spec_info->u.vmdk.data = (ImageInfoSpecificVmdk) {
3017 .create_type = g_strdup(s->create_type),
3018 .cid = s->cid,
3019 .parent_cid = s->parent_cid,
3020 };
3021
3022 tail = &spec_info->u.vmdk.data->extents;
3023 for (i = 0; i < s->num_extents; i++) {
3024 QAPI_LIST_APPEND(tail, vmdk_get_extent_info(&s->extents[i]));
3025 }
3026
3027 return spec_info;
3028 }
3029
3030 static bool vmdk_extents_type_eq(const VmdkExtent *a, const VmdkExtent *b)
3031 {
3032 return a->flat == b->flat &&
3033 a->compressed == b->compressed &&
3034 (a->flat || a->cluster_sectors == b->cluster_sectors);
3035 }
3036
3037 static int coroutine_fn
3038 vmdk_co_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
3039 {
3040 int i;
3041 BDRVVmdkState *s = bs->opaque;
3042 assert(s->num_extents);
3043
3044 /* See if we have multiple extents but they have different cases */
3045 for (i = 1; i < s->num_extents; i++) {
3046 if (!vmdk_extents_type_eq(&s->extents[0], &s->extents[i])) {
3047 return -ENOTSUP;
3048 }
3049 }
3050 bdi->needs_compressed_writes = s->extents[0].compressed;
3051 if (!s->extents[0].flat) {
3052 bdi->cluster_size = s->extents[0].cluster_sectors << BDRV_SECTOR_BITS;
3053 }
3054 return 0;
3055 }
3056
3057 static void GRAPH_RDLOCK
3058 vmdk_gather_child_options(BlockDriverState *bs, QDict *target,
3059 bool backing_overridden)
3060 {
3061 /* No children but file and backing can be explicitly specified (TODO) */
3062 qdict_put(target, "file",
3063 qobject_ref(bs->file->bs->full_open_options));
3064
3065 if (backing_overridden) {
3066 if (bs->backing) {
3067 qdict_put(target, "backing",
3068 qobject_ref(bs->backing->bs->full_open_options));
3069 } else {
3070 qdict_put_null(target, "backing");
3071 }
3072 }
3073 }
3074
3075 static QemuOptsList vmdk_create_opts = {
3076 .name = "vmdk-create-opts",
3077 .head = QTAILQ_HEAD_INITIALIZER(vmdk_create_opts.head),
3078 .desc = {
3079 {
3080 .name = BLOCK_OPT_SIZE,
3081 .type = QEMU_OPT_SIZE,
3082 .help = "Virtual disk size"
3083 },
3084 {
3085 .name = BLOCK_OPT_ADAPTER_TYPE,
3086 .type = QEMU_OPT_STRING,
3087 .help = "Virtual adapter type, can be one of "
3088 "ide (default), lsilogic, buslogic or legacyESX"
3089 },
3090 {
3091 .name = BLOCK_OPT_BACKING_FILE,
3092 .type = QEMU_OPT_STRING,
3093 .help = "File name of a base image"
3094 },
3095 {
3096 .name = BLOCK_OPT_BACKING_FMT,
3097 .type = QEMU_OPT_STRING,
3098 .help = "Must be 'vmdk' if present",
3099 },
3100 {
3101 .name = BLOCK_OPT_COMPAT6,
3102 .type = QEMU_OPT_BOOL,
3103 .help = "VMDK version 6 image",
3104 .def_value_str = "off"
3105 },
3106 {
3107 .name = BLOCK_OPT_HWVERSION,
3108 .type = QEMU_OPT_STRING,
3109 .help = "VMDK hardware version",
3110 .def_value_str = "undefined"
3111 },
3112 {
3113 .name = BLOCK_OPT_TOOLSVERSION,
3114 .type = QEMU_OPT_STRING,
3115 .help = "VMware guest tools version",
3116 },
3117 {
3118 .name = BLOCK_OPT_SUBFMT,
3119 .type = QEMU_OPT_STRING,
3120 .help =
3121 "VMDK flat extent format, can be one of "
3122 "{monolithicSparse (default) | monolithicFlat | twoGbMaxExtentSparse | twoGbMaxExtentFlat | streamOptimized} "
3123 },
3124 {
3125 .name = BLOCK_OPT_ZEROED_GRAIN,
3126 .type = QEMU_OPT_BOOL,
3127 .help = "Enable efficient zero writes "
3128 "using the zeroed-grain GTE feature"
3129 },
3130 { /* end of list */ }
3131 }
3132 };
3133
3134 static BlockDriver bdrv_vmdk = {
3135 .format_name = "vmdk",
3136 .instance_size = sizeof(BDRVVmdkState),
3137 .bdrv_probe = vmdk_probe,
3138 .bdrv_open = vmdk_open,
3139 .bdrv_co_check = vmdk_co_check,
3140 .bdrv_reopen_prepare = vmdk_reopen_prepare,
3141 .bdrv_reopen_commit = vmdk_reopen_commit,
3142 .bdrv_reopen_abort = vmdk_reopen_abort,
3143 .bdrv_child_perm = bdrv_default_perms,
3144 .bdrv_co_preadv = vmdk_co_preadv,
3145 .bdrv_co_pwritev = vmdk_co_pwritev,
3146 .bdrv_co_pwritev_compressed = vmdk_co_pwritev_compressed,
3147 .bdrv_co_pwrite_zeroes = vmdk_co_pwrite_zeroes,
3148 .bdrv_close = vmdk_close,
3149 .bdrv_co_create_opts = vmdk_co_create_opts,
3150 .bdrv_co_create = vmdk_co_create,
3151 .bdrv_co_block_status = vmdk_co_block_status,
3152 .bdrv_co_get_allocated_file_size = vmdk_co_get_allocated_file_size,
3153 .bdrv_has_zero_init = vmdk_has_zero_init,
3154 .bdrv_get_specific_info = vmdk_get_specific_info,
3155 .bdrv_refresh_limits = vmdk_refresh_limits,
3156 .bdrv_co_get_info = vmdk_co_get_info,
3157 .bdrv_gather_child_options = vmdk_gather_child_options,
3158
3159 .is_format = true,
3160 .supports_backing = true,
3161 .create_opts = &vmdk_create_opts,
3162 };
3163
3164 static void bdrv_vmdk_init(void)
3165 {
3166 bdrv_register(&bdrv_vmdk);
3167 }
3168
3169 block_init(bdrv_vmdk_init);
armbru's QEMU hackery