block: Add blk_new_open()
[qemu/ar7.git] / block / vmdk.c
blob8410a158a23e210d00df8e582209a125e8b8ec09
1 /*
2 * Block driver for the VMDK format
4 * Copyright (c) 2004 Fabrice Bellard
5 * Copyright (c) 2005 Filip Navara
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:
14 * The above copyright notice and this permission notice shall be included in
15 * all copies or substantial portions of the Software.
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.
26 #include "qemu-common.h"
27 #include "block/block_int.h"
28 #include "qemu/module.h"
29 #include "migration/migration.h"
30 #include <zlib.h>
31 #include <glib.h>
33 #define VMDK3_MAGIC (('C' << 24) | ('O' << 16) | ('W' << 8) | 'D')
34 #define VMDK4_MAGIC (('K' << 24) | ('D' << 16) | ('M' << 8) | 'V')
35 #define VMDK4_COMPRESSION_DEFLATE 1
36 #define VMDK4_FLAG_NL_DETECT (1 << 0)
37 #define VMDK4_FLAG_RGD (1 << 1)
38 /* Zeroed-grain enable bit */
39 #define VMDK4_FLAG_ZERO_GRAIN (1 << 2)
40 #define VMDK4_FLAG_COMPRESS (1 << 16)
41 #define VMDK4_FLAG_MARKER (1 << 17)
42 #define VMDK4_GD_AT_END 0xffffffffffffffffULL
44 #define VMDK_GTE_ZEROED 0x1
46 /* VMDK internal error codes */
47 #define VMDK_OK 0
48 #define VMDK_ERROR (-1)
49 /* Cluster not allocated */
50 #define VMDK_UNALLOC (-2)
51 #define VMDK_ZEROED (-3)
53 #define BLOCK_OPT_ZEROED_GRAIN "zeroed_grain"
55 typedef struct {
56 uint32_t version;
57 uint32_t flags;
58 uint32_t disk_sectors;
59 uint32_t granularity;
60 uint32_t l1dir_offset;
61 uint32_t l1dir_size;
62 uint32_t file_sectors;
63 uint32_t cylinders;
64 uint32_t heads;
65 uint32_t sectors_per_track;
66 } QEMU_PACKED VMDK3Header;
68 typedef struct {
69 uint32_t version;
70 uint32_t flags;
71 uint64_t capacity;
72 uint64_t granularity;
73 uint64_t desc_offset;
74 uint64_t desc_size;
75 /* Number of GrainTableEntries per GrainTable */
76 uint32_t num_gtes_per_gt;
77 uint64_t rgd_offset;
78 uint64_t gd_offset;
79 uint64_t grain_offset;
80 char filler[1];
81 char check_bytes[4];
82 uint16_t compressAlgorithm;
83 } QEMU_PACKED VMDK4Header;
85 #define L2_CACHE_SIZE 16
87 typedef struct VmdkExtent {
88 BlockDriverState *file;
89 bool flat;
90 bool compressed;
91 bool has_marker;
92 bool has_zero_grain;
93 int version;
94 int64_t sectors;
95 int64_t end_sector;
96 int64_t flat_start_offset;
97 int64_t l1_table_offset;
98 int64_t l1_backup_table_offset;
99 uint32_t *l1_table;
100 uint32_t *l1_backup_table;
101 unsigned int l1_size;
102 uint32_t l1_entry_sectors;
104 unsigned int l2_size;
105 uint32_t *l2_cache;
106 uint32_t l2_cache_offsets[L2_CACHE_SIZE];
107 uint32_t l2_cache_counts[L2_CACHE_SIZE];
109 int64_t cluster_sectors;
110 int64_t next_cluster_sector;
111 char *type;
112 } VmdkExtent;
114 typedef struct BDRVVmdkState {
115 CoMutex lock;
116 uint64_t desc_offset;
117 bool cid_updated;
118 bool cid_checked;
119 uint32_t cid;
120 uint32_t parent_cid;
121 int num_extents;
122 /* Extent array with num_extents entries, ascend ordered by address */
123 VmdkExtent *extents;
124 Error *migration_blocker;
125 char *create_type;
126 } BDRVVmdkState;
128 typedef struct VmdkMetaData {
129 unsigned int l1_index;
130 unsigned int l2_index;
131 unsigned int l2_offset;
132 int valid;
133 uint32_t *l2_cache_entry;
134 } VmdkMetaData;
136 typedef struct VmdkGrainMarker {
137 uint64_t lba;
138 uint32_t size;
139 uint8_t data[0];
140 } QEMU_PACKED VmdkGrainMarker;
142 enum {
143 MARKER_END_OF_STREAM = 0,
144 MARKER_GRAIN_TABLE = 1,
145 MARKER_GRAIN_DIRECTORY = 2,
146 MARKER_FOOTER = 3,
149 static int vmdk_probe(const uint8_t *buf, int buf_size, const char *filename)
151 uint32_t magic;
153 if (buf_size < 4) {
154 return 0;
156 magic = be32_to_cpu(*(uint32_t *)buf);
157 if (magic == VMDK3_MAGIC ||
158 magic == VMDK4_MAGIC) {
159 return 100;
160 } else {
161 const char *p = (const char *)buf;
162 const char *end = p + buf_size;
163 while (p < end) {
164 if (*p == '#') {
165 /* skip comment line */
166 while (p < end && *p != '\n') {
167 p++;
169 p++;
170 continue;
172 if (*p == ' ') {
173 while (p < end && *p == ' ') {
174 p++;
176 /* skip '\r' if windows line endings used. */
177 if (p < end && *p == '\r') {
178 p++;
180 /* only accept blank lines before 'version=' line */
181 if (p == end || *p != '\n') {
182 return 0;
184 p++;
185 continue;
187 if (end - p >= strlen("version=X\n")) {
188 if (strncmp("version=1\n", p, strlen("version=1\n")) == 0 ||
189 strncmp("version=2\n", p, strlen("version=2\n")) == 0) {
190 return 100;
193 if (end - p >= strlen("version=X\r\n")) {
194 if (strncmp("version=1\r\n", p, strlen("version=1\r\n")) == 0 ||
195 strncmp("version=2\r\n", p, strlen("version=2\r\n")) == 0) {
196 return 100;
199 return 0;
201 return 0;
205 #define SECTOR_SIZE 512
206 #define DESC_SIZE (20 * SECTOR_SIZE) /* 20 sectors of 512 bytes each */
207 #define BUF_SIZE 4096
208 #define HEADER_SIZE 512 /* first sector of 512 bytes */
210 static void vmdk_free_extents(BlockDriverState *bs)
212 int i;
213 BDRVVmdkState *s = bs->opaque;
214 VmdkExtent *e;
216 for (i = 0; i < s->num_extents; i++) {
217 e = &s->extents[i];
218 g_free(e->l1_table);
219 g_free(e->l2_cache);
220 g_free(e->l1_backup_table);
221 g_free(e->type);
222 if (e->file != bs->file) {
223 bdrv_unref(e->file);
226 g_free(s->extents);
229 static void vmdk_free_last_extent(BlockDriverState *bs)
231 BDRVVmdkState *s = bs->opaque;
233 if (s->num_extents == 0) {
234 return;
236 s->num_extents--;
237 s->extents = g_renew(VmdkExtent, s->extents, s->num_extents);
240 static uint32_t vmdk_read_cid(BlockDriverState *bs, int parent)
242 char desc[DESC_SIZE];
243 uint32_t cid = 0xffffffff;
244 const char *p_name, *cid_str;
245 size_t cid_str_size;
246 BDRVVmdkState *s = bs->opaque;
247 int ret;
249 ret = bdrv_pread(bs->file, s->desc_offset, desc, DESC_SIZE);
250 if (ret < 0) {
251 return 0;
254 if (parent) {
255 cid_str = "parentCID";
256 cid_str_size = sizeof("parentCID");
257 } else {
258 cid_str = "CID";
259 cid_str_size = sizeof("CID");
262 desc[DESC_SIZE - 1] = '\0';
263 p_name = strstr(desc, cid_str);
264 if (p_name != NULL) {
265 p_name += cid_str_size;
266 sscanf(p_name, "%" SCNx32, &cid);
269 return cid;
272 static int vmdk_write_cid(BlockDriverState *bs, uint32_t cid)
274 char desc[DESC_SIZE], tmp_desc[DESC_SIZE];
275 char *p_name, *tmp_str;
276 BDRVVmdkState *s = bs->opaque;
277 int ret;
279 ret = bdrv_pread(bs->file, s->desc_offset, desc, DESC_SIZE);
280 if (ret < 0) {
281 return ret;
284 desc[DESC_SIZE - 1] = '\0';
285 tmp_str = strstr(desc, "parentCID");
286 if (tmp_str == NULL) {
287 return -EINVAL;
290 pstrcpy(tmp_desc, sizeof(tmp_desc), tmp_str);
291 p_name = strstr(desc, "CID");
292 if (p_name != NULL) {
293 p_name += sizeof("CID");
294 snprintf(p_name, sizeof(desc) - (p_name - desc), "%" PRIx32 "\n", cid);
295 pstrcat(desc, sizeof(desc), tmp_desc);
298 ret = bdrv_pwrite_sync(bs->file, s->desc_offset, desc, DESC_SIZE);
299 if (ret < 0) {
300 return ret;
303 return 0;
306 static int vmdk_is_cid_valid(BlockDriverState *bs)
308 BDRVVmdkState *s = bs->opaque;
309 BlockDriverState *p_bs = bs->backing_hd;
310 uint32_t cur_pcid;
312 if (!s->cid_checked && p_bs) {
313 cur_pcid = vmdk_read_cid(p_bs, 0);
314 if (s->parent_cid != cur_pcid) {
315 /* CID not valid */
316 return 0;
319 s->cid_checked = true;
320 /* CID valid */
321 return 1;
324 /* Queue extents, if any, for reopen() */
325 static int vmdk_reopen_prepare(BDRVReopenState *state,
326 BlockReopenQueue *queue, Error **errp)
328 BDRVVmdkState *s;
329 int ret = -1;
330 int i;
331 VmdkExtent *e;
333 assert(state != NULL);
334 assert(state->bs != NULL);
336 if (queue == NULL) {
337 error_setg(errp, "No reopen queue for VMDK extents");
338 goto exit;
341 s = state->bs->opaque;
343 assert(s != NULL);
345 for (i = 0; i < s->num_extents; i++) {
346 e = &s->extents[i];
347 if (e->file != state->bs->file) {
348 bdrv_reopen_queue(queue, e->file, state->flags);
351 ret = 0;
353 exit:
354 return ret;
357 static int vmdk_parent_open(BlockDriverState *bs)
359 char *p_name;
360 char desc[DESC_SIZE + 1];
361 BDRVVmdkState *s = bs->opaque;
362 int ret;
364 desc[DESC_SIZE] = '\0';
365 ret = bdrv_pread(bs->file, s->desc_offset, desc, DESC_SIZE);
366 if (ret < 0) {
367 return ret;
370 p_name = strstr(desc, "parentFileNameHint");
371 if (p_name != NULL) {
372 char *end_name;
374 p_name += sizeof("parentFileNameHint") + 1;
375 end_name = strchr(p_name, '\"');
376 if (end_name == NULL) {
377 return -EINVAL;
379 if ((end_name - p_name) > sizeof(bs->backing_file) - 1) {
380 return -EINVAL;
383 pstrcpy(bs->backing_file, end_name - p_name + 1, p_name);
386 return 0;
389 /* Create and append extent to the extent array. Return the added VmdkExtent
390 * address. return NULL if allocation failed. */
391 static int vmdk_add_extent(BlockDriverState *bs,
392 BlockDriverState *file, bool flat, int64_t sectors,
393 int64_t l1_offset, int64_t l1_backup_offset,
394 uint32_t l1_size,
395 int l2_size, uint64_t cluster_sectors,
396 VmdkExtent **new_extent,
397 Error **errp)
399 VmdkExtent *extent;
400 BDRVVmdkState *s = bs->opaque;
401 int64_t nb_sectors;
403 if (cluster_sectors > 0x200000) {
404 /* 0x200000 * 512Bytes = 1GB for one cluster is unrealistic */
405 error_setg(errp, "Invalid granularity, image may be corrupt");
406 return -EFBIG;
408 if (l1_size > 512 * 1024 * 1024) {
409 /* Although with big capacity and small l1_entry_sectors, we can get a
410 * big l1_size, we don't want unbounded value to allocate the table.
411 * Limit it to 512M, which is 16PB for default cluster and L2 table
412 * size */
413 error_setg(errp, "L1 size too big");
414 return -EFBIG;
417 nb_sectors = bdrv_nb_sectors(file);
418 if (nb_sectors < 0) {
419 return nb_sectors;
422 s->extents = g_renew(VmdkExtent, s->extents, s->num_extents + 1);
423 extent = &s->extents[s->num_extents];
424 s->num_extents++;
426 memset(extent, 0, sizeof(VmdkExtent));
427 extent->file = file;
428 extent->flat = flat;
429 extent->sectors = sectors;
430 extent->l1_table_offset = l1_offset;
431 extent->l1_backup_table_offset = l1_backup_offset;
432 extent->l1_size = l1_size;
433 extent->l1_entry_sectors = l2_size * cluster_sectors;
434 extent->l2_size = l2_size;
435 extent->cluster_sectors = flat ? sectors : cluster_sectors;
436 extent->next_cluster_sector = ROUND_UP(nb_sectors, cluster_sectors);
438 if (s->num_extents > 1) {
439 extent->end_sector = (*(extent - 1)).end_sector + extent->sectors;
440 } else {
441 extent->end_sector = extent->sectors;
443 bs->total_sectors = extent->end_sector;
444 if (new_extent) {
445 *new_extent = extent;
447 return 0;
450 static int vmdk_init_tables(BlockDriverState *bs, VmdkExtent *extent,
451 Error **errp)
453 int ret;
454 int l1_size, i;
456 /* read the L1 table */
457 l1_size = extent->l1_size * sizeof(uint32_t);
458 extent->l1_table = g_try_malloc(l1_size);
459 if (l1_size && extent->l1_table == NULL) {
460 return -ENOMEM;
463 ret = bdrv_pread(extent->file,
464 extent->l1_table_offset,
465 extent->l1_table,
466 l1_size);
467 if (ret < 0) {
468 error_setg_errno(errp, -ret,
469 "Could not read l1 table from extent '%s'",
470 extent->file->filename);
471 goto fail_l1;
473 for (i = 0; i < extent->l1_size; i++) {
474 le32_to_cpus(&extent->l1_table[i]);
477 if (extent->l1_backup_table_offset) {
478 extent->l1_backup_table = g_try_malloc(l1_size);
479 if (l1_size && extent->l1_backup_table == NULL) {
480 ret = -ENOMEM;
481 goto fail_l1;
483 ret = bdrv_pread(extent->file,
484 extent->l1_backup_table_offset,
485 extent->l1_backup_table,
486 l1_size);
487 if (ret < 0) {
488 error_setg_errno(errp, -ret,
489 "Could not read l1 backup table from extent '%s'",
490 extent->file->filename);
491 goto fail_l1b;
493 for (i = 0; i < extent->l1_size; i++) {
494 le32_to_cpus(&extent->l1_backup_table[i]);
498 extent->l2_cache =
499 g_new(uint32_t, extent->l2_size * L2_CACHE_SIZE);
500 return 0;
501 fail_l1b:
502 g_free(extent->l1_backup_table);
503 fail_l1:
504 g_free(extent->l1_table);
505 return ret;
508 static int vmdk_open_vmfs_sparse(BlockDriverState *bs,
509 BlockDriverState *file,
510 int flags, Error **errp)
512 int ret;
513 uint32_t magic;
514 VMDK3Header header;
515 VmdkExtent *extent;
517 ret = bdrv_pread(file, sizeof(magic), &header, sizeof(header));
518 if (ret < 0) {
519 error_setg_errno(errp, -ret,
520 "Could not read header from file '%s'",
521 file->filename);
522 return ret;
524 ret = vmdk_add_extent(bs, file, false,
525 le32_to_cpu(header.disk_sectors),
526 le32_to_cpu(header.l1dir_offset) << 9,
528 le32_to_cpu(header.l1dir_size),
529 4096,
530 le32_to_cpu(header.granularity),
531 &extent,
532 errp);
533 if (ret < 0) {
534 return ret;
536 ret = vmdk_init_tables(bs, extent, errp);
537 if (ret) {
538 /* free extent allocated by vmdk_add_extent */
539 vmdk_free_last_extent(bs);
541 return ret;
544 static int vmdk_open_desc_file(BlockDriverState *bs, int flags, char *buf,
545 Error **errp);
547 static char *vmdk_read_desc(BlockDriverState *file, uint64_t desc_offset,
548 Error **errp)
550 int64_t size;
551 char *buf;
552 int ret;
554 size = bdrv_getlength(file);
555 if (size < 0) {
556 error_setg_errno(errp, -size, "Could not access file");
557 return NULL;
560 if (size < 4) {
561 /* Both descriptor file and sparse image must be much larger than 4
562 * bytes, also callers of vmdk_read_desc want to compare the first 4
563 * bytes with VMDK4_MAGIC, let's error out if less is read. */
564 error_setg(errp, "File is too small, not a valid image");
565 return NULL;
568 size = MIN(size, (1 << 20) - 1); /* avoid unbounded allocation */
569 buf = g_malloc(size + 1);
571 ret = bdrv_pread(file, desc_offset, buf, size);
572 if (ret < 0) {
573 error_setg_errno(errp, -ret, "Could not read from file");
574 g_free(buf);
575 return NULL;
577 buf[ret] = 0;
579 return buf;
582 static int vmdk_open_vmdk4(BlockDriverState *bs,
583 BlockDriverState *file,
584 int flags, Error **errp)
586 int ret;
587 uint32_t magic;
588 uint32_t l1_size, l1_entry_sectors;
589 VMDK4Header header;
590 VmdkExtent *extent;
591 BDRVVmdkState *s = bs->opaque;
592 int64_t l1_backup_offset = 0;
594 ret = bdrv_pread(file, sizeof(magic), &header, sizeof(header));
595 if (ret < 0) {
596 error_setg_errno(errp, -ret,
597 "Could not read header from file '%s'",
598 file->filename);
599 return -EINVAL;
601 if (header.capacity == 0) {
602 uint64_t desc_offset = le64_to_cpu(header.desc_offset);
603 if (desc_offset) {
604 char *buf = vmdk_read_desc(file, desc_offset << 9, errp);
605 if (!buf) {
606 return -EINVAL;
608 ret = vmdk_open_desc_file(bs, flags, buf, errp);
609 g_free(buf);
610 return ret;
614 if (!s->create_type) {
615 s->create_type = g_strdup("monolithicSparse");
618 if (le64_to_cpu(header.gd_offset) == VMDK4_GD_AT_END) {
620 * The footer takes precedence over the header, so read it in. The
621 * footer starts at offset -1024 from the end: One sector for the
622 * footer, and another one for the end-of-stream marker.
624 struct {
625 struct {
626 uint64_t val;
627 uint32_t size;
628 uint32_t type;
629 uint8_t pad[512 - 16];
630 } QEMU_PACKED footer_marker;
632 uint32_t magic;
633 VMDK4Header header;
634 uint8_t pad[512 - 4 - sizeof(VMDK4Header)];
636 struct {
637 uint64_t val;
638 uint32_t size;
639 uint32_t type;
640 uint8_t pad[512 - 16];
641 } QEMU_PACKED eos_marker;
642 } QEMU_PACKED footer;
644 ret = bdrv_pread(file,
645 bs->file->total_sectors * 512 - 1536,
646 &footer, sizeof(footer));
647 if (ret < 0) {
648 error_setg_errno(errp, -ret, "Failed to read footer");
649 return ret;
652 /* Some sanity checks for the footer */
653 if (be32_to_cpu(footer.magic) != VMDK4_MAGIC ||
654 le32_to_cpu(footer.footer_marker.size) != 0 ||
655 le32_to_cpu(footer.footer_marker.type) != MARKER_FOOTER ||
656 le64_to_cpu(footer.eos_marker.val) != 0 ||
657 le32_to_cpu(footer.eos_marker.size) != 0 ||
658 le32_to_cpu(footer.eos_marker.type) != MARKER_END_OF_STREAM)
660 error_setg(errp, "Invalid footer");
661 return -EINVAL;
664 header = footer.header;
667 if (le32_to_cpu(header.version) > 3) {
668 char buf[64];
669 snprintf(buf, sizeof(buf), "VMDK version %" PRId32,
670 le32_to_cpu(header.version));
671 error_set(errp, QERR_UNKNOWN_BLOCK_FORMAT_FEATURE,
672 bdrv_get_device_name(bs), "vmdk", buf);
673 return -ENOTSUP;
674 } else if (le32_to_cpu(header.version) == 3 && (flags & BDRV_O_RDWR)) {
675 /* VMware KB 2064959 explains that version 3 added support for
676 * persistent changed block tracking (CBT), and backup software can
677 * read it as version=1 if it doesn't care about the changed area
678 * information. So we are safe to enable read only. */
679 error_setg(errp, "VMDK version 3 must be read only");
680 return -EINVAL;
683 if (le32_to_cpu(header.num_gtes_per_gt) > 512) {
684 error_setg(errp, "L2 table size too big");
685 return -EINVAL;
688 l1_entry_sectors = le32_to_cpu(header.num_gtes_per_gt)
689 * le64_to_cpu(header.granularity);
690 if (l1_entry_sectors == 0) {
691 error_setg(errp, "L1 entry size is invalid");
692 return -EINVAL;
694 l1_size = (le64_to_cpu(header.capacity) + l1_entry_sectors - 1)
695 / l1_entry_sectors;
696 if (le32_to_cpu(header.flags) & VMDK4_FLAG_RGD) {
697 l1_backup_offset = le64_to_cpu(header.rgd_offset) << 9;
699 if (bdrv_nb_sectors(file) < le64_to_cpu(header.grain_offset)) {
700 error_setg(errp, "File truncated, expecting at least %" PRId64 " bytes",
701 (int64_t)(le64_to_cpu(header.grain_offset)
702 * BDRV_SECTOR_SIZE));
703 return -EINVAL;
706 ret = vmdk_add_extent(bs, file, false,
707 le64_to_cpu(header.capacity),
708 le64_to_cpu(header.gd_offset) << 9,
709 l1_backup_offset,
710 l1_size,
711 le32_to_cpu(header.num_gtes_per_gt),
712 le64_to_cpu(header.granularity),
713 &extent,
714 errp);
715 if (ret < 0) {
716 return ret;
718 extent->compressed =
719 le16_to_cpu(header.compressAlgorithm) == VMDK4_COMPRESSION_DEFLATE;
720 if (extent->compressed) {
721 g_free(s->create_type);
722 s->create_type = g_strdup("streamOptimized");
724 extent->has_marker = le32_to_cpu(header.flags) & VMDK4_FLAG_MARKER;
725 extent->version = le32_to_cpu(header.version);
726 extent->has_zero_grain = le32_to_cpu(header.flags) & VMDK4_FLAG_ZERO_GRAIN;
727 ret = vmdk_init_tables(bs, extent, errp);
728 if (ret) {
729 /* free extent allocated by vmdk_add_extent */
730 vmdk_free_last_extent(bs);
732 return ret;
735 /* find an option value out of descriptor file */
736 static int vmdk_parse_description(const char *desc, const char *opt_name,
737 char *buf, int buf_size)
739 char *opt_pos, *opt_end;
740 const char *end = desc + strlen(desc);
742 opt_pos = strstr(desc, opt_name);
743 if (!opt_pos) {
744 return VMDK_ERROR;
746 /* Skip "=\"" following opt_name */
747 opt_pos += strlen(opt_name) + 2;
748 if (opt_pos >= end) {
749 return VMDK_ERROR;
751 opt_end = opt_pos;
752 while (opt_end < end && *opt_end != '"') {
753 opt_end++;
755 if (opt_end == end || buf_size < opt_end - opt_pos + 1) {
756 return VMDK_ERROR;
758 pstrcpy(buf, opt_end - opt_pos + 1, opt_pos);
759 return VMDK_OK;
762 /* Open an extent file and append to bs array */
763 static int vmdk_open_sparse(BlockDriverState *bs,
764 BlockDriverState *file, int flags,
765 char *buf, Error **errp)
767 uint32_t magic;
769 magic = ldl_be_p(buf);
770 switch (magic) {
771 case VMDK3_MAGIC:
772 return vmdk_open_vmfs_sparse(bs, file, flags, errp);
773 break;
774 case VMDK4_MAGIC:
775 return vmdk_open_vmdk4(bs, file, flags, errp);
776 break;
777 default:
778 error_setg(errp, "Image not in VMDK format");
779 return -EINVAL;
780 break;
784 static int vmdk_parse_extents(const char *desc, BlockDriverState *bs,
785 const char *desc_file_path, Error **errp)
787 int ret;
788 int matches;
789 char access[11];
790 char type[11];
791 char fname[512];
792 const char *p = desc;
793 int64_t sectors = 0;
794 int64_t flat_offset;
795 char *extent_path;
796 BlockDriverState *extent_file;
797 BDRVVmdkState *s = bs->opaque;
798 VmdkExtent *extent;
800 while (*p) {
801 /* parse extent line in one of below formats:
803 * RW [size in sectors] FLAT "file-name.vmdk" OFFSET
804 * RW [size in sectors] SPARSE "file-name.vmdk"
805 * RW [size in sectors] VMFS "file-name.vmdk"
806 * RW [size in sectors] VMFSSPARSE "file-name.vmdk"
808 flat_offset = -1;
809 matches = sscanf(p, "%10s %" SCNd64 " %10s \"%511[^\n\r\"]\" %" SCNd64,
810 access, &sectors, type, fname, &flat_offset);
811 if (matches < 4 || strcmp(access, "RW")) {
812 goto next_line;
813 } else if (!strcmp(type, "FLAT")) {
814 if (matches != 5 || flat_offset < 0) {
815 error_setg(errp, "Invalid extent lines: \n%s", p);
816 return -EINVAL;
818 } else if (!strcmp(type, "VMFS")) {
819 if (matches == 4) {
820 flat_offset = 0;
821 } else {
822 error_setg(errp, "Invalid extent lines:\n%s", p);
823 return -EINVAL;
825 } else if (matches != 4) {
826 error_setg(errp, "Invalid extent lines:\n%s", p);
827 return -EINVAL;
830 if (sectors <= 0 ||
831 (strcmp(type, "FLAT") && strcmp(type, "SPARSE") &&
832 strcmp(type, "VMFS") && strcmp(type, "VMFSSPARSE")) ||
833 (strcmp(access, "RW"))) {
834 goto next_line;
837 if (!path_is_absolute(fname) && !path_has_protocol(fname) &&
838 !desc_file_path[0])
840 error_setg(errp, "Cannot use relative extent paths with VMDK "
841 "descriptor file '%s'", bs->file->filename);
842 return -EINVAL;
845 extent_path = g_malloc0(PATH_MAX);
846 path_combine(extent_path, PATH_MAX, desc_file_path, fname);
847 extent_file = NULL;
848 ret = bdrv_open(&extent_file, extent_path, NULL, NULL,
849 bs->open_flags | BDRV_O_PROTOCOL, NULL, errp);
850 g_free(extent_path);
851 if (ret) {
852 return ret;
855 /* save to extents array */
856 if (!strcmp(type, "FLAT") || !strcmp(type, "VMFS")) {
857 /* FLAT extent */
859 ret = vmdk_add_extent(bs, extent_file, true, sectors,
860 0, 0, 0, 0, 0, &extent, errp);
861 if (ret < 0) {
862 bdrv_unref(extent_file);
863 return ret;
865 extent->flat_start_offset = flat_offset << 9;
866 } else if (!strcmp(type, "SPARSE") || !strcmp(type, "VMFSSPARSE")) {
867 /* SPARSE extent and VMFSSPARSE extent are both "COWD" sparse file*/
868 char *buf = vmdk_read_desc(extent_file, 0, errp);
869 if (!buf) {
870 ret = -EINVAL;
871 } else {
872 ret = vmdk_open_sparse(bs, extent_file, bs->open_flags, buf, errp);
874 g_free(buf);
875 if (ret) {
876 bdrv_unref(extent_file);
877 return ret;
879 extent = &s->extents[s->num_extents - 1];
880 } else {
881 error_setg(errp, "Unsupported extent type '%s'", type);
882 bdrv_unref(extent_file);
883 return -ENOTSUP;
885 extent->type = g_strdup(type);
886 next_line:
887 /* move to next line */
888 while (*p) {
889 if (*p == '\n') {
890 p++;
891 break;
893 p++;
896 return 0;
899 static int vmdk_open_desc_file(BlockDriverState *bs, int flags, char *buf,
900 Error **errp)
902 int ret;
903 char ct[128];
904 BDRVVmdkState *s = bs->opaque;
906 if (vmdk_parse_description(buf, "createType", ct, sizeof(ct))) {
907 error_setg(errp, "invalid VMDK image descriptor");
908 ret = -EINVAL;
909 goto exit;
911 if (strcmp(ct, "monolithicFlat") &&
912 strcmp(ct, "vmfs") &&
913 strcmp(ct, "vmfsSparse") &&
914 strcmp(ct, "twoGbMaxExtentSparse") &&
915 strcmp(ct, "twoGbMaxExtentFlat")) {
916 error_setg(errp, "Unsupported image type '%s'", ct);
917 ret = -ENOTSUP;
918 goto exit;
920 s->create_type = g_strdup(ct);
921 s->desc_offset = 0;
922 ret = vmdk_parse_extents(buf, bs, bs->file->exact_filename, errp);
923 exit:
924 return ret;
927 static int vmdk_open(BlockDriverState *bs, QDict *options, int flags,
928 Error **errp)
930 char *buf;
931 int ret;
932 BDRVVmdkState *s = bs->opaque;
933 uint32_t magic;
935 buf = vmdk_read_desc(bs->file, 0, errp);
936 if (!buf) {
937 return -EINVAL;
940 magic = ldl_be_p(buf);
941 switch (magic) {
942 case VMDK3_MAGIC:
943 case VMDK4_MAGIC:
944 ret = vmdk_open_sparse(bs, bs->file, flags, buf, errp);
945 s->desc_offset = 0x200;
946 break;
947 default:
948 ret = vmdk_open_desc_file(bs, flags, buf, errp);
949 break;
951 if (ret) {
952 goto fail;
955 /* try to open parent images, if exist */
956 ret = vmdk_parent_open(bs);
957 if (ret) {
958 goto fail;
960 s->cid = vmdk_read_cid(bs, 0);
961 s->parent_cid = vmdk_read_cid(bs, 1);
962 qemu_co_mutex_init(&s->lock);
964 /* Disable migration when VMDK images are used */
965 error_set(&s->migration_blocker,
966 QERR_BLOCK_FORMAT_FEATURE_NOT_SUPPORTED,
967 "vmdk", bdrv_get_device_name(bs), "live migration");
968 migrate_add_blocker(s->migration_blocker);
969 g_free(buf);
970 return 0;
972 fail:
973 g_free(buf);
974 g_free(s->create_type);
975 s->create_type = NULL;
976 vmdk_free_extents(bs);
977 return ret;
981 static void vmdk_refresh_limits(BlockDriverState *bs, Error **errp)
983 BDRVVmdkState *s = bs->opaque;
984 int i;
986 for (i = 0; i < s->num_extents; i++) {
987 if (!s->extents[i].flat) {
988 bs->bl.write_zeroes_alignment =
989 MAX(bs->bl.write_zeroes_alignment,
990 s->extents[i].cluster_sectors);
996 * get_whole_cluster
998 * Copy backing file's cluster that covers @sector_num, otherwise write zero,
999 * to the cluster at @cluster_sector_num.
1001 * If @skip_start_sector < @skip_end_sector, the relative range
1002 * [@skip_start_sector, @skip_end_sector) is not copied or written, and leave
1003 * it for call to write user data in the request.
1005 static int get_whole_cluster(BlockDriverState *bs,
1006 VmdkExtent *extent,
1007 uint64_t cluster_sector_num,
1008 uint64_t sector_num,
1009 uint64_t skip_start_sector,
1010 uint64_t skip_end_sector)
1012 int ret = VMDK_OK;
1013 int64_t cluster_bytes;
1014 uint8_t *whole_grain;
1016 /* For COW, align request sector_num to cluster start */
1017 sector_num = QEMU_ALIGN_DOWN(sector_num, extent->cluster_sectors);
1018 cluster_bytes = extent->cluster_sectors << BDRV_SECTOR_BITS;
1019 whole_grain = qemu_blockalign(bs, cluster_bytes);
1021 if (!bs->backing_hd) {
1022 memset(whole_grain, 0, skip_start_sector << BDRV_SECTOR_BITS);
1023 memset(whole_grain + (skip_end_sector << BDRV_SECTOR_BITS), 0,
1024 cluster_bytes - (skip_end_sector << BDRV_SECTOR_BITS));
1027 assert(skip_end_sector <= extent->cluster_sectors);
1028 /* we will be here if it's first write on non-exist grain(cluster).
1029 * try to read from parent image, if exist */
1030 if (bs->backing_hd && !vmdk_is_cid_valid(bs)) {
1031 ret = VMDK_ERROR;
1032 goto exit;
1035 /* Read backing data before skip range */
1036 if (skip_start_sector > 0) {
1037 if (bs->backing_hd) {
1038 ret = bdrv_read(bs->backing_hd, sector_num,
1039 whole_grain, skip_start_sector);
1040 if (ret < 0) {
1041 ret = VMDK_ERROR;
1042 goto exit;
1045 ret = bdrv_write(extent->file, cluster_sector_num, whole_grain,
1046 skip_start_sector);
1047 if (ret < 0) {
1048 ret = VMDK_ERROR;
1049 goto exit;
1052 /* Read backing data after skip range */
1053 if (skip_end_sector < extent->cluster_sectors) {
1054 if (bs->backing_hd) {
1055 ret = bdrv_read(bs->backing_hd, sector_num + skip_end_sector,
1056 whole_grain + (skip_end_sector << BDRV_SECTOR_BITS),
1057 extent->cluster_sectors - skip_end_sector);
1058 if (ret < 0) {
1059 ret = VMDK_ERROR;
1060 goto exit;
1063 ret = bdrv_write(extent->file, cluster_sector_num + skip_end_sector,
1064 whole_grain + (skip_end_sector << BDRV_SECTOR_BITS),
1065 extent->cluster_sectors - skip_end_sector);
1066 if (ret < 0) {
1067 ret = VMDK_ERROR;
1068 goto exit;
1072 exit:
1073 qemu_vfree(whole_grain);
1074 return ret;
1077 static int vmdk_L2update(VmdkExtent *extent, VmdkMetaData *m_data,
1078 uint32_t offset)
1080 offset = cpu_to_le32(offset);
1081 /* update L2 table */
1082 if (bdrv_pwrite_sync(
1083 extent->file,
1084 ((int64_t)m_data->l2_offset * 512)
1085 + (m_data->l2_index * sizeof(offset)),
1086 &offset, sizeof(offset)) < 0) {
1087 return VMDK_ERROR;
1089 /* update backup L2 table */
1090 if (extent->l1_backup_table_offset != 0) {
1091 m_data->l2_offset = extent->l1_backup_table[m_data->l1_index];
1092 if (bdrv_pwrite_sync(
1093 extent->file,
1094 ((int64_t)m_data->l2_offset * 512)
1095 + (m_data->l2_index * sizeof(offset)),
1096 &offset, sizeof(offset)) < 0) {
1097 return VMDK_ERROR;
1100 if (m_data->l2_cache_entry) {
1101 *m_data->l2_cache_entry = offset;
1104 return VMDK_OK;
1108 * get_cluster_offset
1110 * Look up cluster offset in extent file by sector number, and store in
1111 * @cluster_offset.
1113 * For flat extents, the start offset as parsed from the description file is
1114 * returned.
1116 * For sparse extents, look up in L1, L2 table. If allocate is true, return an
1117 * offset for a new cluster and update L2 cache. If there is a backing file,
1118 * COW is done before returning; otherwise, zeroes are written to the allocated
1119 * cluster. Both COW and zero writing skips the sector range
1120 * [@skip_start_sector, @skip_end_sector) passed in by caller, because caller
1121 * has new data to write there.
1123 * Returns: VMDK_OK if cluster exists and mapped in the image.
1124 * VMDK_UNALLOC if cluster is not mapped and @allocate is false.
1125 * VMDK_ERROR if failed.
1127 static int get_cluster_offset(BlockDriverState *bs,
1128 VmdkExtent *extent,
1129 VmdkMetaData *m_data,
1130 uint64_t offset,
1131 bool allocate,
1132 uint64_t *cluster_offset,
1133 uint64_t skip_start_sector,
1134 uint64_t skip_end_sector)
1136 unsigned int l1_index, l2_offset, l2_index;
1137 int min_index, i, j;
1138 uint32_t min_count, *l2_table;
1139 bool zeroed = false;
1140 int64_t ret;
1141 int64_t cluster_sector;
1143 if (m_data) {
1144 m_data->valid = 0;
1146 if (extent->flat) {
1147 *cluster_offset = extent->flat_start_offset;
1148 return VMDK_OK;
1151 offset -= (extent->end_sector - extent->sectors) * SECTOR_SIZE;
1152 l1_index = (offset >> 9) / extent->l1_entry_sectors;
1153 if (l1_index >= extent->l1_size) {
1154 return VMDK_ERROR;
1156 l2_offset = extent->l1_table[l1_index];
1157 if (!l2_offset) {
1158 return VMDK_UNALLOC;
1160 for (i = 0; i < L2_CACHE_SIZE; i++) {
1161 if (l2_offset == extent->l2_cache_offsets[i]) {
1162 /* increment the hit count */
1163 if (++extent->l2_cache_counts[i] == 0xffffffff) {
1164 for (j = 0; j < L2_CACHE_SIZE; j++) {
1165 extent->l2_cache_counts[j] >>= 1;
1168 l2_table = extent->l2_cache + (i * extent->l2_size);
1169 goto found;
1172 /* not found: load a new entry in the least used one */
1173 min_index = 0;
1174 min_count = 0xffffffff;
1175 for (i = 0; i < L2_CACHE_SIZE; i++) {
1176 if (extent->l2_cache_counts[i] < min_count) {
1177 min_count = extent->l2_cache_counts[i];
1178 min_index = i;
1181 l2_table = extent->l2_cache + (min_index * extent->l2_size);
1182 if (bdrv_pread(
1183 extent->file,
1184 (int64_t)l2_offset * 512,
1185 l2_table,
1186 extent->l2_size * sizeof(uint32_t)
1187 ) != extent->l2_size * sizeof(uint32_t)) {
1188 return VMDK_ERROR;
1191 extent->l2_cache_offsets[min_index] = l2_offset;
1192 extent->l2_cache_counts[min_index] = 1;
1193 found:
1194 l2_index = ((offset >> 9) / extent->cluster_sectors) % extent->l2_size;
1195 cluster_sector = le32_to_cpu(l2_table[l2_index]);
1197 if (m_data) {
1198 m_data->valid = 1;
1199 m_data->l1_index = l1_index;
1200 m_data->l2_index = l2_index;
1201 m_data->l2_offset = l2_offset;
1202 m_data->l2_cache_entry = &l2_table[l2_index];
1204 if (extent->has_zero_grain && cluster_sector == VMDK_GTE_ZEROED) {
1205 zeroed = true;
1208 if (!cluster_sector || zeroed) {
1209 if (!allocate) {
1210 return zeroed ? VMDK_ZEROED : VMDK_UNALLOC;
1213 cluster_sector = extent->next_cluster_sector;
1214 extent->next_cluster_sector += extent->cluster_sectors;
1216 /* First of all we write grain itself, to avoid race condition
1217 * that may to corrupt the image.
1218 * This problem may occur because of insufficient space on host disk
1219 * or inappropriate VM shutdown.
1221 ret = get_whole_cluster(bs, extent,
1222 cluster_sector,
1223 offset >> BDRV_SECTOR_BITS,
1224 skip_start_sector, skip_end_sector);
1225 if (ret) {
1226 return ret;
1229 *cluster_offset = cluster_sector << BDRV_SECTOR_BITS;
1230 return VMDK_OK;
1233 static VmdkExtent *find_extent(BDRVVmdkState *s,
1234 int64_t sector_num, VmdkExtent *start_hint)
1236 VmdkExtent *extent = start_hint;
1238 if (!extent) {
1239 extent = &s->extents[0];
1241 while (extent < &s->extents[s->num_extents]) {
1242 if (sector_num < extent->end_sector) {
1243 return extent;
1245 extent++;
1247 return NULL;
1250 static int64_t coroutine_fn vmdk_co_get_block_status(BlockDriverState *bs,
1251 int64_t sector_num, int nb_sectors, int *pnum)
1253 BDRVVmdkState *s = bs->opaque;
1254 int64_t index_in_cluster, n, ret;
1255 uint64_t offset;
1256 VmdkExtent *extent;
1258 extent = find_extent(s, sector_num, NULL);
1259 if (!extent) {
1260 return 0;
1262 qemu_co_mutex_lock(&s->lock);
1263 ret = get_cluster_offset(bs, extent, NULL,
1264 sector_num * 512, false, &offset,
1265 0, 0);
1266 qemu_co_mutex_unlock(&s->lock);
1268 switch (ret) {
1269 case VMDK_ERROR:
1270 ret = -EIO;
1271 break;
1272 case VMDK_UNALLOC:
1273 ret = 0;
1274 break;
1275 case VMDK_ZEROED:
1276 ret = BDRV_BLOCK_ZERO;
1277 break;
1278 case VMDK_OK:
1279 ret = BDRV_BLOCK_DATA;
1280 if (extent->file == bs->file && !extent->compressed) {
1281 ret |= BDRV_BLOCK_OFFSET_VALID | offset;
1284 break;
1287 index_in_cluster = sector_num % extent->cluster_sectors;
1288 n = extent->cluster_sectors - index_in_cluster;
1289 if (n > nb_sectors) {
1290 n = nb_sectors;
1292 *pnum = n;
1293 return ret;
1296 static int vmdk_write_extent(VmdkExtent *extent, int64_t cluster_offset,
1297 int64_t offset_in_cluster, const uint8_t *buf,
1298 int nb_sectors, int64_t sector_num)
1300 int ret;
1301 VmdkGrainMarker *data = NULL;
1302 uLongf buf_len;
1303 const uint8_t *write_buf = buf;
1304 int write_len = nb_sectors * 512;
1306 if (extent->compressed) {
1307 if (!extent->has_marker) {
1308 ret = -EINVAL;
1309 goto out;
1311 buf_len = (extent->cluster_sectors << 9) * 2;
1312 data = g_malloc(buf_len + sizeof(VmdkGrainMarker));
1313 if (compress(data->data, &buf_len, buf, nb_sectors << 9) != Z_OK ||
1314 buf_len == 0) {
1315 ret = -EINVAL;
1316 goto out;
1318 data->lba = sector_num;
1319 data->size = buf_len;
1320 write_buf = (uint8_t *)data;
1321 write_len = buf_len + sizeof(VmdkGrainMarker);
1323 ret = bdrv_pwrite(extent->file,
1324 cluster_offset + offset_in_cluster,
1325 write_buf,
1326 write_len);
1327 if (ret != write_len) {
1328 ret = ret < 0 ? ret : -EIO;
1329 goto out;
1331 ret = 0;
1332 out:
1333 g_free(data);
1334 return ret;
1337 static int vmdk_read_extent(VmdkExtent *extent, int64_t cluster_offset,
1338 int64_t offset_in_cluster, uint8_t *buf,
1339 int nb_sectors)
1341 int ret;
1342 int cluster_bytes, buf_bytes;
1343 uint8_t *cluster_buf, *compressed_data;
1344 uint8_t *uncomp_buf;
1345 uint32_t data_len;
1346 VmdkGrainMarker *marker;
1347 uLongf buf_len;
1350 if (!extent->compressed) {
1351 ret = bdrv_pread(extent->file,
1352 cluster_offset + offset_in_cluster,
1353 buf, nb_sectors * 512);
1354 if (ret == nb_sectors * 512) {
1355 return 0;
1356 } else {
1357 return -EIO;
1360 cluster_bytes = extent->cluster_sectors * 512;
1361 /* Read two clusters in case GrainMarker + compressed data > one cluster */
1362 buf_bytes = cluster_bytes * 2;
1363 cluster_buf = g_malloc(buf_bytes);
1364 uncomp_buf = g_malloc(cluster_bytes);
1365 ret = bdrv_pread(extent->file,
1366 cluster_offset,
1367 cluster_buf, buf_bytes);
1368 if (ret < 0) {
1369 goto out;
1371 compressed_data = cluster_buf;
1372 buf_len = cluster_bytes;
1373 data_len = cluster_bytes;
1374 if (extent->has_marker) {
1375 marker = (VmdkGrainMarker *)cluster_buf;
1376 compressed_data = marker->data;
1377 data_len = le32_to_cpu(marker->size);
1379 if (!data_len || data_len > buf_bytes) {
1380 ret = -EINVAL;
1381 goto out;
1383 ret = uncompress(uncomp_buf, &buf_len, compressed_data, data_len);
1384 if (ret != Z_OK) {
1385 ret = -EINVAL;
1386 goto out;
1389 if (offset_in_cluster < 0 ||
1390 offset_in_cluster + nb_sectors * 512 > buf_len) {
1391 ret = -EINVAL;
1392 goto out;
1394 memcpy(buf, uncomp_buf + offset_in_cluster, nb_sectors * 512);
1395 ret = 0;
1397 out:
1398 g_free(uncomp_buf);
1399 g_free(cluster_buf);
1400 return ret;
1403 static int vmdk_read(BlockDriverState *bs, int64_t sector_num,
1404 uint8_t *buf, int nb_sectors)
1406 BDRVVmdkState *s = bs->opaque;
1407 int ret;
1408 uint64_t n, index_in_cluster;
1409 uint64_t extent_begin_sector, extent_relative_sector_num;
1410 VmdkExtent *extent = NULL;
1411 uint64_t cluster_offset;
1413 while (nb_sectors > 0) {
1414 extent = find_extent(s, sector_num, extent);
1415 if (!extent) {
1416 return -EIO;
1418 ret = get_cluster_offset(bs, extent, NULL,
1419 sector_num << 9, false, &cluster_offset,
1420 0, 0);
1421 extent_begin_sector = extent->end_sector - extent->sectors;
1422 extent_relative_sector_num = sector_num - extent_begin_sector;
1423 index_in_cluster = extent_relative_sector_num % extent->cluster_sectors;
1424 n = extent->cluster_sectors - index_in_cluster;
1425 if (n > nb_sectors) {
1426 n = nb_sectors;
1428 if (ret != VMDK_OK) {
1429 /* if not allocated, try to read from parent image, if exist */
1430 if (bs->backing_hd && ret != VMDK_ZEROED) {
1431 if (!vmdk_is_cid_valid(bs)) {
1432 return -EINVAL;
1434 ret = bdrv_read(bs->backing_hd, sector_num, buf, n);
1435 if (ret < 0) {
1436 return ret;
1438 } else {
1439 memset(buf, 0, 512 * n);
1441 } else {
1442 ret = vmdk_read_extent(extent,
1443 cluster_offset, index_in_cluster * 512,
1444 buf, n);
1445 if (ret) {
1446 return ret;
1449 nb_sectors -= n;
1450 sector_num += n;
1451 buf += n * 512;
1453 return 0;
1456 static coroutine_fn int vmdk_co_read(BlockDriverState *bs, int64_t sector_num,
1457 uint8_t *buf, int nb_sectors)
1459 int ret;
1460 BDRVVmdkState *s = bs->opaque;
1461 qemu_co_mutex_lock(&s->lock);
1462 ret = vmdk_read(bs, sector_num, buf, nb_sectors);
1463 qemu_co_mutex_unlock(&s->lock);
1464 return ret;
1468 * vmdk_write:
1469 * @zeroed: buf is ignored (data is zero), use zeroed_grain GTE feature
1470 * if possible, otherwise return -ENOTSUP.
1471 * @zero_dry_run: used for zeroed == true only, don't update L2 table, just try
1472 * with each cluster. By dry run we can find if the zero write
1473 * is possible without modifying image data.
1475 * Returns: error code with 0 for success.
1477 static int vmdk_write(BlockDriverState *bs, int64_t sector_num,
1478 const uint8_t *buf, int nb_sectors,
1479 bool zeroed, bool zero_dry_run)
1481 BDRVVmdkState *s = bs->opaque;
1482 VmdkExtent *extent = NULL;
1483 int ret;
1484 int64_t index_in_cluster, n;
1485 uint64_t extent_begin_sector, extent_relative_sector_num;
1486 uint64_t cluster_offset;
1487 VmdkMetaData m_data;
1489 if (sector_num > bs->total_sectors) {
1490 error_report("Wrong offset: sector_num=0x%" PRIx64
1491 " total_sectors=0x%" PRIx64 "\n",
1492 sector_num, bs->total_sectors);
1493 return -EIO;
1496 while (nb_sectors > 0) {
1497 extent = find_extent(s, sector_num, extent);
1498 if (!extent) {
1499 return -EIO;
1501 extent_begin_sector = extent->end_sector - extent->sectors;
1502 extent_relative_sector_num = sector_num - extent_begin_sector;
1503 index_in_cluster = extent_relative_sector_num % extent->cluster_sectors;
1504 n = extent->cluster_sectors - index_in_cluster;
1505 if (n > nb_sectors) {
1506 n = nb_sectors;
1508 ret = get_cluster_offset(bs, extent, &m_data, sector_num << 9,
1509 !(extent->compressed || zeroed),
1510 &cluster_offset,
1511 index_in_cluster, index_in_cluster + n);
1512 if (extent->compressed) {
1513 if (ret == VMDK_OK) {
1514 /* Refuse write to allocated cluster for streamOptimized */
1515 error_report("Could not write to allocated cluster"
1516 " for streamOptimized");
1517 return -EIO;
1518 } else {
1519 /* allocate */
1520 ret = get_cluster_offset(bs, extent, &m_data, sector_num << 9,
1521 true, &cluster_offset, 0, 0);
1524 if (ret == VMDK_ERROR) {
1525 return -EINVAL;
1527 if (zeroed) {
1528 /* Do zeroed write, buf is ignored */
1529 if (extent->has_zero_grain &&
1530 index_in_cluster == 0 &&
1531 n >= extent->cluster_sectors) {
1532 n = extent->cluster_sectors;
1533 if (!zero_dry_run) {
1534 /* update L2 tables */
1535 if (vmdk_L2update(extent, &m_data, VMDK_GTE_ZEROED)
1536 != VMDK_OK) {
1537 return -EIO;
1540 } else {
1541 return -ENOTSUP;
1543 } else {
1544 ret = vmdk_write_extent(extent,
1545 cluster_offset, index_in_cluster * 512,
1546 buf, n, sector_num);
1547 if (ret) {
1548 return ret;
1550 if (m_data.valid) {
1551 /* update L2 tables */
1552 if (vmdk_L2update(extent, &m_data,
1553 cluster_offset >> BDRV_SECTOR_BITS)
1554 != VMDK_OK) {
1555 return -EIO;
1559 nb_sectors -= n;
1560 sector_num += n;
1561 buf += n * 512;
1563 /* update CID on the first write every time the virtual disk is
1564 * opened */
1565 if (!s->cid_updated) {
1566 ret = vmdk_write_cid(bs, g_random_int());
1567 if (ret < 0) {
1568 return ret;
1570 s->cid_updated = true;
1573 return 0;
1576 static coroutine_fn int vmdk_co_write(BlockDriverState *bs, int64_t sector_num,
1577 const uint8_t *buf, int nb_sectors)
1579 int ret;
1580 BDRVVmdkState *s = bs->opaque;
1581 qemu_co_mutex_lock(&s->lock);
1582 ret = vmdk_write(bs, sector_num, buf, nb_sectors, false, false);
1583 qemu_co_mutex_unlock(&s->lock);
1584 return ret;
1587 static int vmdk_write_compressed(BlockDriverState *bs,
1588 int64_t sector_num,
1589 const uint8_t *buf,
1590 int nb_sectors)
1592 BDRVVmdkState *s = bs->opaque;
1593 if (s->num_extents == 1 && s->extents[0].compressed) {
1594 return vmdk_write(bs, sector_num, buf, nb_sectors, false, false);
1595 } else {
1596 return -ENOTSUP;
1600 static int coroutine_fn vmdk_co_write_zeroes(BlockDriverState *bs,
1601 int64_t sector_num,
1602 int nb_sectors,
1603 BdrvRequestFlags flags)
1605 int ret;
1606 BDRVVmdkState *s = bs->opaque;
1607 qemu_co_mutex_lock(&s->lock);
1608 /* write zeroes could fail if sectors not aligned to cluster, test it with
1609 * dry_run == true before really updating image */
1610 ret = vmdk_write(bs, sector_num, NULL, nb_sectors, true, true);
1611 if (!ret) {
1612 ret = vmdk_write(bs, sector_num, NULL, nb_sectors, true, false);
1614 qemu_co_mutex_unlock(&s->lock);
1615 return ret;
1618 static int vmdk_create_extent(const char *filename, int64_t filesize,
1619 bool flat, bool compress, bool zeroed_grain,
1620 QemuOpts *opts, Error **errp)
1622 int ret, i;
1623 BlockDriverState *bs = NULL;
1624 VMDK4Header header;
1625 Error *local_err = NULL;
1626 uint32_t tmp, magic, grains, gd_sectors, gt_size, gt_count;
1627 uint32_t *gd_buf = NULL;
1628 int gd_buf_size;
1630 ret = bdrv_create_file(filename, opts, &local_err);
1631 if (ret < 0) {
1632 error_propagate(errp, local_err);
1633 goto exit;
1636 assert(bs == NULL);
1637 ret = bdrv_open(&bs, filename, NULL, NULL, BDRV_O_RDWR | BDRV_O_PROTOCOL,
1638 NULL, &local_err);
1639 if (ret < 0) {
1640 error_propagate(errp, local_err);
1641 goto exit;
1644 if (flat) {
1645 ret = bdrv_truncate(bs, filesize);
1646 if (ret < 0) {
1647 error_setg_errno(errp, -ret, "Could not truncate file");
1649 goto exit;
1651 magic = cpu_to_be32(VMDK4_MAGIC);
1652 memset(&header, 0, sizeof(header));
1653 header.version = zeroed_grain ? 2 : 1;
1654 header.flags = VMDK4_FLAG_RGD | VMDK4_FLAG_NL_DETECT
1655 | (compress ? VMDK4_FLAG_COMPRESS | VMDK4_FLAG_MARKER : 0)
1656 | (zeroed_grain ? VMDK4_FLAG_ZERO_GRAIN : 0);
1657 header.compressAlgorithm = compress ? VMDK4_COMPRESSION_DEFLATE : 0;
1658 header.capacity = filesize / BDRV_SECTOR_SIZE;
1659 header.granularity = 128;
1660 header.num_gtes_per_gt = BDRV_SECTOR_SIZE;
1662 grains = DIV_ROUND_UP(filesize / BDRV_SECTOR_SIZE, header.granularity);
1663 gt_size = DIV_ROUND_UP(header.num_gtes_per_gt * sizeof(uint32_t),
1664 BDRV_SECTOR_SIZE);
1665 gt_count = DIV_ROUND_UP(grains, header.num_gtes_per_gt);
1666 gd_sectors = DIV_ROUND_UP(gt_count * sizeof(uint32_t), BDRV_SECTOR_SIZE);
1668 header.desc_offset = 1;
1669 header.desc_size = 20;
1670 header.rgd_offset = header.desc_offset + header.desc_size;
1671 header.gd_offset = header.rgd_offset + gd_sectors + (gt_size * gt_count);
1672 header.grain_offset =
1673 ROUND_UP(header.gd_offset + gd_sectors + (gt_size * gt_count),
1674 header.granularity);
1675 /* swap endianness for all header fields */
1676 header.version = cpu_to_le32(header.version);
1677 header.flags = cpu_to_le32(header.flags);
1678 header.capacity = cpu_to_le64(header.capacity);
1679 header.granularity = cpu_to_le64(header.granularity);
1680 header.num_gtes_per_gt = cpu_to_le32(header.num_gtes_per_gt);
1681 header.desc_offset = cpu_to_le64(header.desc_offset);
1682 header.desc_size = cpu_to_le64(header.desc_size);
1683 header.rgd_offset = cpu_to_le64(header.rgd_offset);
1684 header.gd_offset = cpu_to_le64(header.gd_offset);
1685 header.grain_offset = cpu_to_le64(header.grain_offset);
1686 header.compressAlgorithm = cpu_to_le16(header.compressAlgorithm);
1688 header.check_bytes[0] = 0xa;
1689 header.check_bytes[1] = 0x20;
1690 header.check_bytes[2] = 0xd;
1691 header.check_bytes[3] = 0xa;
1693 /* write all the data */
1694 ret = bdrv_pwrite(bs, 0, &magic, sizeof(magic));
1695 if (ret < 0) {
1696 error_set(errp, QERR_IO_ERROR);
1697 goto exit;
1699 ret = bdrv_pwrite(bs, sizeof(magic), &header, sizeof(header));
1700 if (ret < 0) {
1701 error_set(errp, QERR_IO_ERROR);
1702 goto exit;
1705 ret = bdrv_truncate(bs, le64_to_cpu(header.grain_offset) << 9);
1706 if (ret < 0) {
1707 error_setg_errno(errp, -ret, "Could not truncate file");
1708 goto exit;
1711 /* write grain directory */
1712 gd_buf_size = gd_sectors * BDRV_SECTOR_SIZE;
1713 gd_buf = g_malloc0(gd_buf_size);
1714 for (i = 0, tmp = le64_to_cpu(header.rgd_offset) + gd_sectors;
1715 i < gt_count; i++, tmp += gt_size) {
1716 gd_buf[i] = cpu_to_le32(tmp);
1718 ret = bdrv_pwrite(bs, le64_to_cpu(header.rgd_offset) * BDRV_SECTOR_SIZE,
1719 gd_buf, gd_buf_size);
1720 if (ret < 0) {
1721 error_set(errp, QERR_IO_ERROR);
1722 goto exit;
1725 /* write backup grain directory */
1726 for (i = 0, tmp = le64_to_cpu(header.gd_offset) + gd_sectors;
1727 i < gt_count; i++, tmp += gt_size) {
1728 gd_buf[i] = cpu_to_le32(tmp);
1730 ret = bdrv_pwrite(bs, le64_to_cpu(header.gd_offset) * BDRV_SECTOR_SIZE,
1731 gd_buf, gd_buf_size);
1732 if (ret < 0) {
1733 error_set(errp, QERR_IO_ERROR);
1734 goto exit;
1737 ret = 0;
1738 exit:
1739 if (bs) {
1740 bdrv_unref(bs);
1742 g_free(gd_buf);
1743 return ret;
1746 static int filename_decompose(const char *filename, char *path, char *prefix,
1747 char *postfix, size_t buf_len, Error **errp)
1749 const char *p, *q;
1751 if (filename == NULL || !strlen(filename)) {
1752 error_setg(errp, "No filename provided");
1753 return VMDK_ERROR;
1755 p = strrchr(filename, '/');
1756 if (p == NULL) {
1757 p = strrchr(filename, '\\');
1759 if (p == NULL) {
1760 p = strrchr(filename, ':');
1762 if (p != NULL) {
1763 p++;
1764 if (p - filename >= buf_len) {
1765 return VMDK_ERROR;
1767 pstrcpy(path, p - filename + 1, filename);
1768 } else {
1769 p = filename;
1770 path[0] = '\0';
1772 q = strrchr(p, '.');
1773 if (q == NULL) {
1774 pstrcpy(prefix, buf_len, p);
1775 postfix[0] = '\0';
1776 } else {
1777 if (q - p >= buf_len) {
1778 return VMDK_ERROR;
1780 pstrcpy(prefix, q - p + 1, p);
1781 pstrcpy(postfix, buf_len, q);
1783 return VMDK_OK;
1786 static int vmdk_create(const char *filename, QemuOpts *opts, Error **errp)
1788 int idx = 0;
1789 BlockDriverState *new_bs = NULL;
1790 Error *local_err = NULL;
1791 char *desc = NULL;
1792 int64_t total_size = 0, filesize;
1793 char *adapter_type = NULL;
1794 char *backing_file = NULL;
1795 char *fmt = NULL;
1796 int flags = 0;
1797 int ret = 0;
1798 bool flat, split, compress;
1799 GString *ext_desc_lines;
1800 char *path = g_malloc0(PATH_MAX);
1801 char *prefix = g_malloc0(PATH_MAX);
1802 char *postfix = g_malloc0(PATH_MAX);
1803 char *desc_line = g_malloc0(BUF_SIZE);
1804 char *ext_filename = g_malloc0(PATH_MAX);
1805 char *desc_filename = g_malloc0(PATH_MAX);
1806 const int64_t split_size = 0x80000000; /* VMDK has constant split size */
1807 const char *desc_extent_line;
1808 char *parent_desc_line = g_malloc0(BUF_SIZE);
1809 uint32_t parent_cid = 0xffffffff;
1810 uint32_t number_heads = 16;
1811 bool zeroed_grain = false;
1812 uint32_t desc_offset = 0, desc_len;
1813 const char desc_template[] =
1814 "# Disk DescriptorFile\n"
1815 "version=1\n"
1816 "CID=%" PRIx32 "\n"
1817 "parentCID=%" PRIx32 "\n"
1818 "createType=\"%s\"\n"
1819 "%s"
1820 "\n"
1821 "# Extent description\n"
1822 "%s"
1823 "\n"
1824 "# The Disk Data Base\n"
1825 "#DDB\n"
1826 "\n"
1827 "ddb.virtualHWVersion = \"%d\"\n"
1828 "ddb.geometry.cylinders = \"%" PRId64 "\"\n"
1829 "ddb.geometry.heads = \"%" PRIu32 "\"\n"
1830 "ddb.geometry.sectors = \"63\"\n"
1831 "ddb.adapterType = \"%s\"\n";
1833 ext_desc_lines = g_string_new(NULL);
1835 if (filename_decompose(filename, path, prefix, postfix, PATH_MAX, errp)) {
1836 ret = -EINVAL;
1837 goto exit;
1839 /* Read out options */
1840 total_size = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0),
1841 BDRV_SECTOR_SIZE);
1842 adapter_type = qemu_opt_get_del(opts, BLOCK_OPT_ADAPTER_TYPE);
1843 backing_file = qemu_opt_get_del(opts, BLOCK_OPT_BACKING_FILE);
1844 if (qemu_opt_get_bool_del(opts, BLOCK_OPT_COMPAT6, false)) {
1845 flags |= BLOCK_FLAG_COMPAT6;
1847 fmt = qemu_opt_get_del(opts, BLOCK_OPT_SUBFMT);
1848 if (qemu_opt_get_bool_del(opts, BLOCK_OPT_ZEROED_GRAIN, false)) {
1849 zeroed_grain = true;
1852 if (!adapter_type) {
1853 adapter_type = g_strdup("ide");
1854 } else if (strcmp(adapter_type, "ide") &&
1855 strcmp(adapter_type, "buslogic") &&
1856 strcmp(adapter_type, "lsilogic") &&
1857 strcmp(adapter_type, "legacyESX")) {
1858 error_setg(errp, "Unknown adapter type: '%s'", adapter_type);
1859 ret = -EINVAL;
1860 goto exit;
1862 if (strcmp(adapter_type, "ide") != 0) {
1863 /* that's the number of heads with which vmware operates when
1864 creating, exporting, etc. vmdk files with a non-ide adapter type */
1865 number_heads = 255;
1867 if (!fmt) {
1868 /* Default format to monolithicSparse */
1869 fmt = g_strdup("monolithicSparse");
1870 } else if (strcmp(fmt, "monolithicFlat") &&
1871 strcmp(fmt, "monolithicSparse") &&
1872 strcmp(fmt, "twoGbMaxExtentSparse") &&
1873 strcmp(fmt, "twoGbMaxExtentFlat") &&
1874 strcmp(fmt, "streamOptimized")) {
1875 error_setg(errp, "Unknown subformat: '%s'", fmt);
1876 ret = -EINVAL;
1877 goto exit;
1879 split = !(strcmp(fmt, "twoGbMaxExtentFlat") &&
1880 strcmp(fmt, "twoGbMaxExtentSparse"));
1881 flat = !(strcmp(fmt, "monolithicFlat") &&
1882 strcmp(fmt, "twoGbMaxExtentFlat"));
1883 compress = !strcmp(fmt, "streamOptimized");
1884 if (flat) {
1885 desc_extent_line = "RW %" PRId64 " FLAT \"%s\" 0\n";
1886 } else {
1887 desc_extent_line = "RW %" PRId64 " SPARSE \"%s\"\n";
1889 if (flat && backing_file) {
1890 error_setg(errp, "Flat image can't have backing file");
1891 ret = -ENOTSUP;
1892 goto exit;
1894 if (flat && zeroed_grain) {
1895 error_setg(errp, "Flat image can't enable zeroed grain");
1896 ret = -ENOTSUP;
1897 goto exit;
1899 if (backing_file) {
1900 BlockDriverState *bs = NULL;
1901 char *full_backing = g_new0(char, PATH_MAX);
1902 bdrv_get_full_backing_filename_from_filename(filename, backing_file,
1903 full_backing, PATH_MAX,
1904 &local_err);
1905 if (local_err) {
1906 g_free(full_backing);
1907 error_propagate(errp, local_err);
1908 ret = -ENOENT;
1909 goto exit;
1911 ret = bdrv_open(&bs, full_backing, NULL, NULL, BDRV_O_NO_BACKING, NULL,
1912 errp);
1913 g_free(full_backing);
1914 if (ret != 0) {
1915 goto exit;
1917 if (strcmp(bs->drv->format_name, "vmdk")) {
1918 bdrv_unref(bs);
1919 ret = -EINVAL;
1920 goto exit;
1922 parent_cid = vmdk_read_cid(bs, 0);
1923 bdrv_unref(bs);
1924 snprintf(parent_desc_line, BUF_SIZE,
1925 "parentFileNameHint=\"%s\"", backing_file);
1928 /* Create extents */
1929 filesize = total_size;
1930 while (filesize > 0) {
1931 int64_t size = filesize;
1933 if (split && size > split_size) {
1934 size = split_size;
1936 if (split) {
1937 snprintf(desc_filename, PATH_MAX, "%s-%c%03d%s",
1938 prefix, flat ? 'f' : 's', ++idx, postfix);
1939 } else if (flat) {
1940 snprintf(desc_filename, PATH_MAX, "%s-flat%s", prefix, postfix);
1941 } else {
1942 snprintf(desc_filename, PATH_MAX, "%s%s", prefix, postfix);
1944 snprintf(ext_filename, PATH_MAX, "%s%s", path, desc_filename);
1946 if (vmdk_create_extent(ext_filename, size,
1947 flat, compress, zeroed_grain, opts, errp)) {
1948 ret = -EINVAL;
1949 goto exit;
1951 filesize -= size;
1953 /* Format description line */
1954 snprintf(desc_line, BUF_SIZE,
1955 desc_extent_line, size / BDRV_SECTOR_SIZE, desc_filename);
1956 g_string_append(ext_desc_lines, desc_line);
1958 /* generate descriptor file */
1959 desc = g_strdup_printf(desc_template,
1960 g_random_int(),
1961 parent_cid,
1962 fmt,
1963 parent_desc_line,
1964 ext_desc_lines->str,
1965 (flags & BLOCK_FLAG_COMPAT6 ? 6 : 4),
1966 total_size /
1967 (int64_t)(63 * number_heads * BDRV_SECTOR_SIZE),
1968 number_heads,
1969 adapter_type);
1970 desc_len = strlen(desc);
1971 /* the descriptor offset = 0x200 */
1972 if (!split && !flat) {
1973 desc_offset = 0x200;
1974 } else {
1975 ret = bdrv_create_file(filename, opts, &local_err);
1976 if (ret < 0) {
1977 error_propagate(errp, local_err);
1978 goto exit;
1981 assert(new_bs == NULL);
1982 ret = bdrv_open(&new_bs, filename, NULL, NULL,
1983 BDRV_O_RDWR | BDRV_O_PROTOCOL, NULL, &local_err);
1984 if (ret < 0) {
1985 error_propagate(errp, local_err);
1986 goto exit;
1988 ret = bdrv_pwrite(new_bs, desc_offset, desc, desc_len);
1989 if (ret < 0) {
1990 error_setg_errno(errp, -ret, "Could not write description");
1991 goto exit;
1993 /* bdrv_pwrite write padding zeros to align to sector, we don't need that
1994 * for description file */
1995 if (desc_offset == 0) {
1996 ret = bdrv_truncate(new_bs, desc_len);
1997 if (ret < 0) {
1998 error_setg_errno(errp, -ret, "Could not truncate file");
2001 exit:
2002 if (new_bs) {
2003 bdrv_unref(new_bs);
2005 g_free(adapter_type);
2006 g_free(backing_file);
2007 g_free(fmt);
2008 g_free(desc);
2009 g_free(path);
2010 g_free(prefix);
2011 g_free(postfix);
2012 g_free(desc_line);
2013 g_free(ext_filename);
2014 g_free(desc_filename);
2015 g_free(parent_desc_line);
2016 g_string_free(ext_desc_lines, true);
2017 return ret;
2020 static void vmdk_close(BlockDriverState *bs)
2022 BDRVVmdkState *s = bs->opaque;
2024 vmdk_free_extents(bs);
2025 g_free(s->create_type);
2027 migrate_del_blocker(s->migration_blocker);
2028 error_free(s->migration_blocker);
2031 static coroutine_fn int vmdk_co_flush(BlockDriverState *bs)
2033 BDRVVmdkState *s = bs->opaque;
2034 int i, err;
2035 int ret = 0;
2037 for (i = 0; i < s->num_extents; i++) {
2038 err = bdrv_co_flush(s->extents[i].file);
2039 if (err < 0) {
2040 ret = err;
2043 return ret;
2046 static int64_t vmdk_get_allocated_file_size(BlockDriverState *bs)
2048 int i;
2049 int64_t ret = 0;
2050 int64_t r;
2051 BDRVVmdkState *s = bs->opaque;
2053 ret = bdrv_get_allocated_file_size(bs->file);
2054 if (ret < 0) {
2055 return ret;
2057 for (i = 0; i < s->num_extents; i++) {
2058 if (s->extents[i].file == bs->file) {
2059 continue;
2061 r = bdrv_get_allocated_file_size(s->extents[i].file);
2062 if (r < 0) {
2063 return r;
2065 ret += r;
2067 return ret;
2070 static int vmdk_has_zero_init(BlockDriverState *bs)
2072 int i;
2073 BDRVVmdkState *s = bs->opaque;
2075 /* If has a flat extent and its underlying storage doesn't have zero init,
2076 * return 0. */
2077 for (i = 0; i < s->num_extents; i++) {
2078 if (s->extents[i].flat) {
2079 if (!bdrv_has_zero_init(s->extents[i].file)) {
2080 return 0;
2084 return 1;
2087 static ImageInfo *vmdk_get_extent_info(VmdkExtent *extent)
2089 ImageInfo *info = g_new0(ImageInfo, 1);
2091 *info = (ImageInfo){
2092 .filename = g_strdup(extent->file->filename),
2093 .format = g_strdup(extent->type),
2094 .virtual_size = extent->sectors * BDRV_SECTOR_SIZE,
2095 .compressed = extent->compressed,
2096 .has_compressed = extent->compressed,
2097 .cluster_size = extent->cluster_sectors * BDRV_SECTOR_SIZE,
2098 .has_cluster_size = !extent->flat,
2101 return info;
2104 static int vmdk_check(BlockDriverState *bs, BdrvCheckResult *result,
2105 BdrvCheckMode fix)
2107 BDRVVmdkState *s = bs->opaque;
2108 VmdkExtent *extent = NULL;
2109 int64_t sector_num = 0;
2110 int64_t total_sectors = bdrv_nb_sectors(bs);
2111 int ret;
2112 uint64_t cluster_offset;
2114 if (fix) {
2115 return -ENOTSUP;
2118 for (;;) {
2119 if (sector_num >= total_sectors) {
2120 return 0;
2122 extent = find_extent(s, sector_num, extent);
2123 if (!extent) {
2124 fprintf(stderr,
2125 "ERROR: could not find extent for sector %" PRId64 "\n",
2126 sector_num);
2127 break;
2129 ret = get_cluster_offset(bs, extent, NULL,
2130 sector_num << BDRV_SECTOR_BITS,
2131 false, &cluster_offset, 0, 0);
2132 if (ret == VMDK_ERROR) {
2133 fprintf(stderr,
2134 "ERROR: could not get cluster_offset for sector %"
2135 PRId64 "\n", sector_num);
2136 break;
2138 if (ret == VMDK_OK && cluster_offset >= bdrv_getlength(extent->file)) {
2139 fprintf(stderr,
2140 "ERROR: cluster offset for sector %"
2141 PRId64 " points after EOF\n", sector_num);
2142 break;
2144 sector_num += extent->cluster_sectors;
2147 result->corruptions++;
2148 return 0;
2151 static ImageInfoSpecific *vmdk_get_specific_info(BlockDriverState *bs)
2153 int i;
2154 BDRVVmdkState *s = bs->opaque;
2155 ImageInfoSpecific *spec_info = g_new0(ImageInfoSpecific, 1);
2156 ImageInfoList **next;
2158 *spec_info = (ImageInfoSpecific){
2159 .kind = IMAGE_INFO_SPECIFIC_KIND_VMDK,
2161 .vmdk = g_new0(ImageInfoSpecificVmdk, 1),
2165 *spec_info->vmdk = (ImageInfoSpecificVmdk) {
2166 .create_type = g_strdup(s->create_type),
2167 .cid = s->cid,
2168 .parent_cid = s->parent_cid,
2171 next = &spec_info->vmdk->extents;
2172 for (i = 0; i < s->num_extents; i++) {
2173 *next = g_new0(ImageInfoList, 1);
2174 (*next)->value = vmdk_get_extent_info(&s->extents[i]);
2175 (*next)->next = NULL;
2176 next = &(*next)->next;
2179 return spec_info;
2182 static bool vmdk_extents_type_eq(const VmdkExtent *a, const VmdkExtent *b)
2184 return a->flat == b->flat &&
2185 a->compressed == b->compressed &&
2186 (a->flat || a->cluster_sectors == b->cluster_sectors);
2189 static int vmdk_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
2191 int i;
2192 BDRVVmdkState *s = bs->opaque;
2193 assert(s->num_extents);
2195 /* See if we have multiple extents but they have different cases */
2196 for (i = 1; i < s->num_extents; i++) {
2197 if (!vmdk_extents_type_eq(&s->extents[0], &s->extents[i])) {
2198 return -ENOTSUP;
2201 bdi->needs_compressed_writes = s->extents[0].compressed;
2202 if (!s->extents[0].flat) {
2203 bdi->cluster_size = s->extents[0].cluster_sectors << BDRV_SECTOR_BITS;
2205 return 0;
2208 static void vmdk_detach_aio_context(BlockDriverState *bs)
2210 BDRVVmdkState *s = bs->opaque;
2211 int i;
2213 for (i = 0; i < s->num_extents; i++) {
2214 bdrv_detach_aio_context(s->extents[i].file);
2218 static void vmdk_attach_aio_context(BlockDriverState *bs,
2219 AioContext *new_context)
2221 BDRVVmdkState *s = bs->opaque;
2222 int i;
2224 for (i = 0; i < s->num_extents; i++) {
2225 bdrv_attach_aio_context(s->extents[i].file, new_context);
2229 static QemuOptsList vmdk_create_opts = {
2230 .name = "vmdk-create-opts",
2231 .head = QTAILQ_HEAD_INITIALIZER(vmdk_create_opts.head),
2232 .desc = {
2234 .name = BLOCK_OPT_SIZE,
2235 .type = QEMU_OPT_SIZE,
2236 .help = "Virtual disk size"
2239 .name = BLOCK_OPT_ADAPTER_TYPE,
2240 .type = QEMU_OPT_STRING,
2241 .help = "Virtual adapter type, can be one of "
2242 "ide (default), lsilogic, buslogic or legacyESX"
2245 .name = BLOCK_OPT_BACKING_FILE,
2246 .type = QEMU_OPT_STRING,
2247 .help = "File name of a base image"
2250 .name = BLOCK_OPT_COMPAT6,
2251 .type = QEMU_OPT_BOOL,
2252 .help = "VMDK version 6 image",
2253 .def_value_str = "off"
2256 .name = BLOCK_OPT_SUBFMT,
2257 .type = QEMU_OPT_STRING,
2258 .help =
2259 "VMDK flat extent format, can be one of "
2260 "{monolithicSparse (default) | monolithicFlat | twoGbMaxExtentSparse | twoGbMaxExtentFlat | streamOptimized} "
2263 .name = BLOCK_OPT_ZEROED_GRAIN,
2264 .type = QEMU_OPT_BOOL,
2265 .help = "Enable efficient zero writes "
2266 "using the zeroed-grain GTE feature"
2268 { /* end of list */ }
2272 static BlockDriver bdrv_vmdk = {
2273 .format_name = "vmdk",
2274 .instance_size = sizeof(BDRVVmdkState),
2275 .bdrv_probe = vmdk_probe,
2276 .bdrv_open = vmdk_open,
2277 .bdrv_check = vmdk_check,
2278 .bdrv_reopen_prepare = vmdk_reopen_prepare,
2279 .bdrv_read = vmdk_co_read,
2280 .bdrv_write = vmdk_co_write,
2281 .bdrv_write_compressed = vmdk_write_compressed,
2282 .bdrv_co_write_zeroes = vmdk_co_write_zeroes,
2283 .bdrv_close = vmdk_close,
2284 .bdrv_create = vmdk_create,
2285 .bdrv_co_flush_to_disk = vmdk_co_flush,
2286 .bdrv_co_get_block_status = vmdk_co_get_block_status,
2287 .bdrv_get_allocated_file_size = vmdk_get_allocated_file_size,
2288 .bdrv_has_zero_init = vmdk_has_zero_init,
2289 .bdrv_get_specific_info = vmdk_get_specific_info,
2290 .bdrv_refresh_limits = vmdk_refresh_limits,
2291 .bdrv_get_info = vmdk_get_info,
2292 .bdrv_detach_aio_context = vmdk_detach_aio_context,
2293 .bdrv_attach_aio_context = vmdk_attach_aio_context,
2295 .supports_backing = true,
2296 .create_opts = &vmdk_create_opts,
2299 static void bdrv_vmdk_init(void)
2301 bdrv_register(&bdrv_vmdk);
2304 block_init(bdrv_vmdk_init);