![[BACK]](/cvsweb/icons/back.gif){kind=icon}
Return to vdi.c CVS log ![[TXT]](/cvsweb/icons/text.gif){kind=icon}
![[DIR]](/cvsweb/icons/dir.gif){kind=icon}
Up to [Qemu by Fabrice Bellard] / qemu / block|
Return to vdi.c CVS log | Up to [Qemu by Fabrice Bellard] / qemu / block |
1.1 root 1: /*
2: * Block driver for the Virtual Disk Image (VDI) format
3: *
1.1.1.7 ! root 4: * Copyright (c) 2009, 2012 Stefan Weil
1.1 root 5: *
6: * This program is free software: you can redistribute it and/or modify
7: * it under the terms of the GNU General Public License as published by
8: * the Free Software Foundation, either version 2 of the License, or
9: * (at your option) version 3 or any later version.
10: *
11: * This program is distributed in the hope that it will be useful,
12: * but WITHOUT ANY WARRANTY; without even the implied warranty of
13: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14: * GNU General Public License for more details.
15: *
16: * You should have received a copy of the GNU General Public License
17: * along with this program. If not, see <http://www.gnu.org/licenses/>.
18: *
19: * Reference:
20: * http://forums.virtualbox.org/viewtopic.php?t=8046
21: *
22: * This driver supports create / read / write operations on VDI images.
23: *
24: * Todo (see also TODO in code):
25: *
26: * Some features like snapshots are still missing.
27: *
28: * Deallocation of zero-filled blocks and shrinking images are missing, too
29: * (might be added to common block layer).
30: *
31: * Allocation of blocks could be optimized (less writes to block map and
32: * header).
33: *
34: * Read and write of adjacents blocks could be done in one operation
35: * (current code uses one operation per block (1 MiB).
36: *
37: * The code is not thread safe (missing locks for changes in header and
38: * block table, no problem with current QEMU).
39: *
40: * Hints:
41: *
42: * Blocks (VDI documentation) correspond to clusters (QEMU).
43: * QEMU's backing files could be implemented using VDI snapshot files (TODO).
44: * VDI snapshot files may also contain the complete machine state.
45: * Maybe this machine state can be converted to QEMU PC machine snapshot data.
46: *
47: * The driver keeps a block cache (little endian entries) in memory.
48: * For the standard block size (1 MiB), a 1 TiB disk will use 4 MiB RAM,
49: * so this seems to be reasonable.
50: */
51:
52: #include "qemu-common.h"
53: #include "block_int.h"
54: #include "module.h"
1.1.1.6 root 55: #include "migration.h"
1.1 root 56:
57: #if defined(CONFIG_UUID)
58: #include <uuid/uuid.h>
59: #else
60: /* TODO: move uuid emulation to some central place in QEMU. */
61: #include "sysemu.h" /* UUID_FMT */
62: typedef unsigned char uuid_t[16];
63: void uuid_generate(uuid_t out);
64: int uuid_is_null(const uuid_t uu);
65: void uuid_unparse(const uuid_t uu, char *out);
66: #endif
67:
68: /* Code configuration options. */
69:
70: /* Enable debug messages. */
71: //~ #define CONFIG_VDI_DEBUG
72:
73: /* Support write operations on VDI images. */
74: #define CONFIG_VDI_WRITE
75:
76: /* Support non-standard block (cluster) size. This is untested.
77: * Maybe it will be needed for very large images.
78: */
79: //~ #define CONFIG_VDI_BLOCK_SIZE
80:
81: /* Support static (fixed, pre-allocated) images. */
82: #define CONFIG_VDI_STATIC_IMAGE
83:
84: /* Command line option for static images. */
85: #define BLOCK_OPT_STATIC "static"
86:
87: #define KiB 1024
88: #define MiB (KiB * KiB)
89:
90: #define SECTOR_SIZE 512
1.1.1.5 root 91: #define DEFAULT_CLUSTER_SIZE (1 * MiB)
1.1 root 92:
93: #if defined(CONFIG_VDI_DEBUG)
94: #define logout(fmt, ...) \
95: fprintf(stderr, "vdi\t%-24s" fmt, __func__, ##__VA_ARGS__)
96: #else
97: #define logout(fmt, ...) ((void)0)
98: #endif
99:
100: /* Image signature. */
101: #define VDI_SIGNATURE 0xbeda107f
102:
103: /* Image version. */
104: #define VDI_VERSION_1_1 0x00010001
105:
106: /* Image type. */
107: #define VDI_TYPE_DYNAMIC 1
108: #define VDI_TYPE_STATIC 2
109:
110: /* Innotek / SUN images use these strings in header.text:
111: * "<<< innotek VirtualBox Disk Image >>>\n"
112: * "<<< Sun xVM VirtualBox Disk Image >>>\n"
113: * "<<< Sun VirtualBox Disk Image >>>\n"
114: * The value does not matter, so QEMU created images use a different text.
115: */
116: #define VDI_TEXT "<<< QEMU VM Virtual Disk Image >>>\n"
117:
1.1.1.6 root 118: /* A never-allocated block; semantically arbitrary content. */
119: #define VDI_UNALLOCATED 0xffffffffU
120:
121: /* A discarded (no longer allocated) block; semantically zero-filled. */
122: #define VDI_DISCARDED 0xfffffffeU
123:
124: #define VDI_IS_ALLOCATED(X) ((X) < VDI_DISCARDED)
1.1 root 125:
126: #if !defined(CONFIG_UUID)
127: void uuid_generate(uuid_t out)
128: {
1.1.1.4 root 129: memset(out, 0, sizeof(uuid_t));
1.1 root 130: }
131:
132: int uuid_is_null(const uuid_t uu)
133: {
134: uuid_t null_uuid = { 0 };
1.1.1.4 root 135: return memcmp(uu, null_uuid, sizeof(uuid_t)) == 0;
1.1 root 136: }
137:
138: void uuid_unparse(const uuid_t uu, char *out)
139: {
140: snprintf(out, 37, UUID_FMT,
141: uu[0], uu[1], uu[2], uu[3], uu[4], uu[5], uu[6], uu[7],
142: uu[8], uu[9], uu[10], uu[11], uu[12], uu[13], uu[14], uu[15]);
143: }
144: #endif
145:
146: typedef struct {
147: char text[0x40];
148: uint32_t signature;
149: uint32_t version;
150: uint32_t header_size;
151: uint32_t image_type;
152: uint32_t image_flags;
153: char description[256];
154: uint32_t offset_bmap;
155: uint32_t offset_data;
156: uint32_t cylinders; /* disk geometry, unused here */
157: uint32_t heads; /* disk geometry, unused here */
158: uint32_t sectors; /* disk geometry, unused here */
159: uint32_t sector_size;
160: uint32_t unused1;
161: uint64_t disk_size;
162: uint32_t block_size;
163: uint32_t block_extra; /* unused here */
164: uint32_t blocks_in_image;
165: uint32_t blocks_allocated;
166: uuid_t uuid_image;
167: uuid_t uuid_last_snap;
168: uuid_t uuid_link;
169: uuid_t uuid_parent;
170: uint64_t unused2[7];
171: } VdiHeader;
172:
173: typedef struct {
174: /* The block map entries are little endian (even in memory). */
175: uint32_t *bmap;
176: /* Size of block (bytes). */
177: uint32_t block_size;
178: /* Size of block (sectors). */
179: uint32_t block_sectors;
180: /* First sector of block map. */
181: uint32_t bmap_sector;
1.1.1.5 root 182: /* VDI header (converted to host endianness). */
1.1 root 183: VdiHeader header;
1.1.1.6 root 184:
185: Error *migration_blocker;
1.1 root 186: } BDRVVdiState;
187:
188: /* Change UUID from little endian (IPRT = VirtualBox format) to big endian
189: * format (network byte order, standard, see RFC 4122) and vice versa.
190: */
191: static void uuid_convert(uuid_t uuid)
192: {
193: bswap32s((uint32_t *)&uuid[0]);
194: bswap16s((uint16_t *)&uuid[4]);
195: bswap16s((uint16_t *)&uuid[6]);
196: }
197:
198: static void vdi_header_to_cpu(VdiHeader *header)
199: {
200: le32_to_cpus(&header->signature);
201: le32_to_cpus(&header->version);
202: le32_to_cpus(&header->header_size);
203: le32_to_cpus(&header->image_type);
204: le32_to_cpus(&header->image_flags);
205: le32_to_cpus(&header->offset_bmap);
206: le32_to_cpus(&header->offset_data);
207: le32_to_cpus(&header->cylinders);
208: le32_to_cpus(&header->heads);
209: le32_to_cpus(&header->sectors);
210: le32_to_cpus(&header->sector_size);
211: le64_to_cpus(&header->disk_size);
212: le32_to_cpus(&header->block_size);
213: le32_to_cpus(&header->block_extra);
214: le32_to_cpus(&header->blocks_in_image);
215: le32_to_cpus(&header->blocks_allocated);
216: uuid_convert(header->uuid_image);
217: uuid_convert(header->uuid_last_snap);
218: uuid_convert(header->uuid_link);
219: uuid_convert(header->uuid_parent);
220: }
221:
222: static void vdi_header_to_le(VdiHeader *header)
223: {
224: cpu_to_le32s(&header->signature);
225: cpu_to_le32s(&header->version);
226: cpu_to_le32s(&header->header_size);
227: cpu_to_le32s(&header->image_type);
228: cpu_to_le32s(&header->image_flags);
229: cpu_to_le32s(&header->offset_bmap);
230: cpu_to_le32s(&header->offset_data);
231: cpu_to_le32s(&header->cylinders);
232: cpu_to_le32s(&header->heads);
233: cpu_to_le32s(&header->sectors);
234: cpu_to_le32s(&header->sector_size);
235: cpu_to_le64s(&header->disk_size);
236: cpu_to_le32s(&header->block_size);
237: cpu_to_le32s(&header->block_extra);
238: cpu_to_le32s(&header->blocks_in_image);
239: cpu_to_le32s(&header->blocks_allocated);
240: cpu_to_le32s(&header->blocks_allocated);
241: uuid_convert(header->uuid_image);
242: uuid_convert(header->uuid_last_snap);
243: uuid_convert(header->uuid_link);
244: uuid_convert(header->uuid_parent);
245: }
246:
247: #if defined(CONFIG_VDI_DEBUG)
248: static void vdi_header_print(VdiHeader *header)
249: {
250: char uuid[37];
251: logout("text %s", header->text);
252: logout("signature 0x%04x\n", header->signature);
253: logout("header size 0x%04x\n", header->header_size);
254: logout("image type 0x%04x\n", header->image_type);
255: logout("image flags 0x%04x\n", header->image_flags);
256: logout("description %s\n", header->description);
257: logout("offset bmap 0x%04x\n", header->offset_bmap);
258: logout("offset data 0x%04x\n", header->offset_data);
259: logout("cylinders 0x%04x\n", header->cylinders);
260: logout("heads 0x%04x\n", header->heads);
261: logout("sectors 0x%04x\n", header->sectors);
262: logout("sector size 0x%04x\n", header->sector_size);
263: logout("image size 0x%" PRIx64 " B (%" PRIu64 " MiB)\n",
264: header->disk_size, header->disk_size / MiB);
265: logout("block size 0x%04x\n", header->block_size);
266: logout("block extra 0x%04x\n", header->block_extra);
267: logout("blocks tot. 0x%04x\n", header->blocks_in_image);
268: logout("blocks all. 0x%04x\n", header->blocks_allocated);
269: uuid_unparse(header->uuid_image, uuid);
270: logout("uuid image %s\n", uuid);
271: uuid_unparse(header->uuid_last_snap, uuid);
272: logout("uuid snap %s\n", uuid);
273: uuid_unparse(header->uuid_link, uuid);
274: logout("uuid link %s\n", uuid);
275: uuid_unparse(header->uuid_parent, uuid);
276: logout("uuid parent %s\n", uuid);
277: }
278: #endif
279:
1.1.1.3 root 280: static int vdi_check(BlockDriverState *bs, BdrvCheckResult *res)
1.1 root 281: {
282: /* TODO: additional checks possible. */
283: BDRVVdiState *s = (BDRVVdiState *)bs->opaque;
284: uint32_t blocks_allocated = 0;
285: uint32_t block;
286: uint32_t *bmap;
287: logout("\n");
288:
1.1.1.6 root 289: bmap = g_malloc(s->header.blocks_in_image * sizeof(uint32_t));
1.1 root 290: memset(bmap, 0xff, s->header.blocks_in_image * sizeof(uint32_t));
291:
292: /* Check block map and value of blocks_allocated. */
293: for (block = 0; block < s->header.blocks_in_image; block++) {
294: uint32_t bmap_entry = le32_to_cpu(s->bmap[block]);
1.1.1.6 root 295: if (VDI_IS_ALLOCATED(bmap_entry)) {
1.1 root 296: if (bmap_entry < s->header.blocks_in_image) {
297: blocks_allocated++;
1.1.1.6 root 298: if (!VDI_IS_ALLOCATED(bmap[bmap_entry])) {
1.1 root 299: bmap[bmap_entry] = bmap_entry;
300: } else {
301: fprintf(stderr, "ERROR: block index %" PRIu32
302: " also used by %" PRIu32 "\n", bmap[bmap_entry], bmap_entry);
1.1.1.3 root 303: res->corruptions++;
1.1 root 304: }
305: } else {
306: fprintf(stderr, "ERROR: block index %" PRIu32
307: " too large, is %" PRIu32 "\n", block, bmap_entry);
1.1.1.3 root 308: res->corruptions++;
1.1 root 309: }
310: }
311: }
312: if (blocks_allocated != s->header.blocks_allocated) {
313: fprintf(stderr, "ERROR: allocated blocks mismatch, is %" PRIu32
314: ", should be %" PRIu32 "\n",
315: blocks_allocated, s->header.blocks_allocated);
1.1.1.3 root 316: res->corruptions++;
1.1 root 317: }
318:
1.1.1.6 root 319: g_free(bmap);
1.1 root 320:
1.1.1.3 root 321: return 0;
1.1 root 322: }
323:
324: static int vdi_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
325: {
326: /* TODO: vdi_get_info would be needed for machine snapshots.
327: vm_state_offset is still missing. */
328: BDRVVdiState *s = (BDRVVdiState *)bs->opaque;
329: logout("\n");
330: bdi->cluster_size = s->block_size;
331: bdi->vm_state_offset = 0;
332: return 0;
333: }
334:
335: static int vdi_make_empty(BlockDriverState *bs)
336: {
337: /* TODO: missing code. */
338: logout("\n");
339: /* The return value for missing code must be 0, see block.c. */
340: return 0;
341: }
342:
343: static int vdi_probe(const uint8_t *buf, int buf_size, const char *filename)
344: {
345: const VdiHeader *header = (const VdiHeader *)buf;
346: int result = 0;
347:
348: logout("\n");
349:
350: if (buf_size < sizeof(*header)) {
351: /* Header too small, no VDI. */
352: } else if (le32_to_cpu(header->signature) == VDI_SIGNATURE) {
353: result = 100;
354: }
355:
356: if (result == 0) {
357: logout("no vdi image\n");
358: } else {
359: logout("%s", header->text);
360: }
361:
362: return result;
363: }
364:
1.1.1.3 root 365: static int vdi_open(BlockDriverState *bs, int flags)
1.1 root 366: {
367: BDRVVdiState *s = bs->opaque;
368: VdiHeader header;
369: size_t bmap_size;
370:
371: logout("\n");
372:
1.1.1.3 root 373: if (bdrv_read(bs->file, 0, (uint8_t *)&header, 1) < 0) {
1.1 root 374: goto fail;
375: }
376:
377: vdi_header_to_cpu(&header);
378: #if defined(CONFIG_VDI_DEBUG)
379: vdi_header_print(&header);
380: #endif
381:
1.1.1.2 root 382: if (header.disk_size % SECTOR_SIZE != 0) {
383: /* 'VBoxManage convertfromraw' can create images with odd disk sizes.
384: We accept them but round the disk size to the next multiple of
385: SECTOR_SIZE. */
386: logout("odd disk size %" PRIu64 " B, round up\n", header.disk_size);
387: header.disk_size += SECTOR_SIZE - 1;
388: header.disk_size &= ~(SECTOR_SIZE - 1);
389: }
390:
1.1 root 391: if (header.version != VDI_VERSION_1_1) {
392: logout("unsupported version %u.%u\n",
393: header.version >> 16, header.version & 0xffff);
394: goto fail;
395: } else if (header.offset_bmap % SECTOR_SIZE != 0) {
396: /* We only support block maps which start on a sector boundary. */
397: logout("unsupported block map offset 0x%x B\n", header.offset_bmap);
398: goto fail;
399: } else if (header.offset_data % SECTOR_SIZE != 0) {
400: /* We only support data blocks which start on a sector boundary. */
401: logout("unsupported data offset 0x%x B\n", header.offset_data);
402: goto fail;
403: } else if (header.sector_size != SECTOR_SIZE) {
404: logout("unsupported sector size %u B\n", header.sector_size);
405: goto fail;
406: } else if (header.block_size != 1 * MiB) {
407: logout("unsupported block size %u B\n", header.block_size);
408: goto fail;
1.1.1.2 root 409: } else if (header.disk_size >
1.1 root 410: (uint64_t)header.blocks_in_image * header.block_size) {
1.1.1.2 root 411: logout("unsupported disk size %" PRIu64 " B\n", header.disk_size);
1.1 root 412: goto fail;
413: } else if (!uuid_is_null(header.uuid_link)) {
414: logout("link uuid != 0, unsupported\n");
415: goto fail;
416: } else if (!uuid_is_null(header.uuid_parent)) {
417: logout("parent uuid != 0, unsupported\n");
418: goto fail;
419: }
420:
421: bs->total_sectors = header.disk_size / SECTOR_SIZE;
422:
423: s->block_size = header.block_size;
424: s->block_sectors = header.block_size / SECTOR_SIZE;
425: s->bmap_sector = header.offset_bmap / SECTOR_SIZE;
426: s->header = header;
427:
428: bmap_size = header.blocks_in_image * sizeof(uint32_t);
429: bmap_size = (bmap_size + SECTOR_SIZE - 1) / SECTOR_SIZE;
1.1.1.3 root 430: if (bmap_size > 0) {
1.1.1.6 root 431: s->bmap = g_malloc(bmap_size * SECTOR_SIZE);
1.1.1.3 root 432: }
433: if (bdrv_read(bs->file, s->bmap_sector, (uint8_t *)s->bmap, bmap_size) < 0) {
1.1 root 434: goto fail_free_bmap;
435: }
436:
1.1.1.6 root 437: /* Disable migration when vdi images are used */
438: error_set(&s->migration_blocker,
439: QERR_BLOCK_FORMAT_FEATURE_NOT_SUPPORTED,
440: "vdi", bs->device_name, "live migration");
441: migrate_add_blocker(s->migration_blocker);
442:
1.1 root 443: return 0;
444:
445: fail_free_bmap:
1.1.1.6 root 446: g_free(s->bmap);
1.1 root 447:
448: fail:
449: return -1;
450: }
451:
1.1.1.7 ! root 452: static int coroutine_fn vdi_co_is_allocated(BlockDriverState *bs,
! 453: int64_t sector_num, int nb_sectors, int *pnum)
1.1 root 454: {
455: /* TODO: Check for too large sector_num (in bdrv_is_allocated or here). */
456: BDRVVdiState *s = (BDRVVdiState *)bs->opaque;
457: size_t bmap_index = sector_num / s->block_sectors;
458: size_t sector_in_block = sector_num % s->block_sectors;
459: int n_sectors = s->block_sectors - sector_in_block;
460: uint32_t bmap_entry = le32_to_cpu(s->bmap[bmap_index]);
461: logout("%p, %" PRId64 ", %d, %p\n", bs, sector_num, nb_sectors, pnum);
462: if (n_sectors > nb_sectors) {
463: n_sectors = nb_sectors;
464: }
465: *pnum = n_sectors;
1.1.1.6 root 466: return VDI_IS_ALLOCATED(bmap_entry);
1.1 root 467: }
468:
1.1.1.7 ! root 469: static int vdi_co_read(BlockDriverState *bs,
! 470: int64_t sector_num, uint8_t *buf, int nb_sectors)
1.1 root 471: {
472: BDRVVdiState *s = bs->opaque;
473: uint32_t bmap_entry;
474: uint32_t block_index;
475: uint32_t sector_in_block;
476: uint32_t n_sectors;
1.1.1.7 ! root 477: int ret = 0;
1.1 root 478:
1.1.1.7 ! root 479: logout("\n");
1.1 root 480:
1.1.1.7 ! root 481: while (ret >= 0 && nb_sectors > 0) {
! 482: block_index = sector_num / s->block_sectors;
! 483: sector_in_block = sector_num % s->block_sectors;
! 484: n_sectors = s->block_sectors - sector_in_block;
! 485: if (n_sectors > nb_sectors) {
! 486: n_sectors = nb_sectors;
1.1 root 487: }
1.1.1.5 root 488:
1.1.1.7 ! root 489: logout("will read %u sectors starting at sector %" PRIu64 "\n",
! 490: n_sectors, sector_num);
1.1.1.5 root 491:
1.1.1.7 ! root 492: /* prepare next AIO request */
! 493: bmap_entry = le32_to_cpu(s->bmap[block_index]);
! 494: if (!VDI_IS_ALLOCATED(bmap_entry)) {
! 495: /* Block not allocated, return zeros, no need to wait. */
! 496: memset(buf, 0, n_sectors * SECTOR_SIZE);
! 497: ret = 0;
! 498: } else {
! 499: uint64_t offset = s->header.offset_data / SECTOR_SIZE +
! 500: (uint64_t)bmap_entry * s->block_sectors +
! 501: sector_in_block;
! 502: ret = bdrv_read(bs->file, offset, buf, n_sectors);
1.1.1.5 root 503: }
1.1.1.7 ! root 504: logout("%u sectors read\n", n_sectors);
! 505:
! 506: nb_sectors -= n_sectors;
! 507: sector_num += n_sectors;
! 508: buf += n_sectors * SECTOR_SIZE;
1.1.1.5 root 509: }
510:
1.1.1.7 ! root 511: return ret;
1.1 root 512: }
513:
1.1.1.7 ! root 514: static int vdi_co_write(BlockDriverState *bs,
! 515: int64_t sector_num, const uint8_t *buf, int nb_sectors)
1.1 root 516: {
517: BDRVVdiState *s = bs->opaque;
518: uint32_t bmap_entry;
519: uint32_t block_index;
520: uint32_t sector_in_block;
521: uint32_t n_sectors;
1.1.1.7 ! root 522: uint32_t bmap_first = VDI_UNALLOCATED;
! 523: uint32_t bmap_last = VDI_UNALLOCATED;
! 524: uint8_t *block = NULL;
! 525: int ret = 0;
1.1 root 526:
1.1.1.7 ! root 527: logout("\n");
1.1 root 528:
1.1.1.7 ! root 529: while (ret >= 0 && nb_sectors > 0) {
! 530: block_index = sector_num / s->block_sectors;
! 531: sector_in_block = sector_num % s->block_sectors;
! 532: n_sectors = s->block_sectors - sector_in_block;
! 533: if (n_sectors > nb_sectors) {
! 534: n_sectors = nb_sectors;
! 535: }
1.1 root 536:
1.1.1.7 ! root 537: logout("will write %u sectors starting at sector %" PRIu64 "\n",
! 538: n_sectors, sector_num);
! 539:
! 540: /* prepare next AIO request */
! 541: bmap_entry = le32_to_cpu(s->bmap[block_index]);
! 542: if (!VDI_IS_ALLOCATED(bmap_entry)) {
! 543: /* Allocate new block and write to it. */
1.1 root 544: uint64_t offset;
1.1.1.7 ! root 545: bmap_entry = s->header.blocks_allocated;
! 546: s->bmap[block_index] = cpu_to_le32(bmap_entry);
! 547: s->header.blocks_allocated++;
! 548: offset = s->header.offset_data / SECTOR_SIZE +
! 549: (uint64_t)bmap_entry * s->block_sectors;
! 550: if (block == NULL) {
! 551: block = g_malloc(s->block_size);
! 552: bmap_first = block_index;
1.1 root 553: }
1.1.1.7 ! root 554: bmap_last = block_index;
! 555: /* Copy data to be written to new block and zero unused parts. */
! 556: memset(block, 0, sector_in_block * SECTOR_SIZE);
! 557: memcpy(block + sector_in_block * SECTOR_SIZE,
! 558: buf, n_sectors * SECTOR_SIZE);
! 559: memset(block + (sector_in_block + n_sectors) * SECTOR_SIZE, 0,
! 560: (s->block_sectors - n_sectors - sector_in_block) * SECTOR_SIZE);
! 561: ret = bdrv_write(bs->file, offset, block, s->block_sectors);
! 562: } else {
! 563: uint64_t offset = s->header.offset_data / SECTOR_SIZE +
! 564: (uint64_t)bmap_entry * s->block_sectors +
! 565: sector_in_block;
! 566: ret = bdrv_write(bs->file, offset, buf, n_sectors);
1.1 root 567: }
568:
1.1.1.7 ! root 569: nb_sectors -= n_sectors;
! 570: sector_num += n_sectors;
! 571: buf += n_sectors * SECTOR_SIZE;
1.1 root 572:
1.1.1.7 ! root 573: logout("%u sectors written\n", n_sectors);
1.1 root 574: }
575:
1.1.1.7 ! root 576: logout("finished data write\n");
! 577: if (ret < 0) {
! 578: return ret;
1.1 root 579: }
580:
1.1.1.7 ! root 581: if (block) {
! 582: /* One or more new blocks were allocated. */
! 583: VdiHeader *header = (VdiHeader *) block;
! 584: uint8_t *base;
! 585: uint64_t offset;
1.1 root 586:
1.1.1.7 ! root 587: logout("now writing modified header\n");
! 588: assert(VDI_IS_ALLOCATED(bmap_first));
! 589: *header = s->header;
! 590: vdi_header_to_le(header);
! 591: ret = bdrv_write(bs->file, 0, block, 1);
! 592: g_free(block);
! 593: block = NULL;
1.1.1.5 root 594:
1.1.1.7 ! root 595: if (ret < 0) {
! 596: return ret;
1.1.1.5 root 597: }
1.1.1.7 ! root 598:
! 599: logout("now writing modified block map entry %u...%u\n",
! 600: bmap_first, bmap_last);
! 601: /* Write modified sectors from block map. */
! 602: bmap_first /= (SECTOR_SIZE / sizeof(uint32_t));
! 603: bmap_last /= (SECTOR_SIZE / sizeof(uint32_t));
! 604: n_sectors = bmap_last - bmap_first + 1;
! 605: offset = s->bmap_sector + bmap_first;
! 606: base = ((uint8_t *)&s->bmap[0]) + bmap_first * SECTOR_SIZE;
! 607: logout("will write %u block map sectors starting from entry %u\n",
! 608: n_sectors, bmap_first);
! 609: ret = bdrv_write(bs->file, offset, base, n_sectors);
1.1.1.5 root 610: }
611:
1.1.1.7 ! root 612: return ret;
1.1 root 613: }
614:
615: static int vdi_create(const char *filename, QEMUOptionParameter *options)
616: {
617: int fd;
618: int result = 0;
619: uint64_t bytes = 0;
620: uint32_t blocks;
1.1.1.5 root 621: size_t block_size = DEFAULT_CLUSTER_SIZE;
1.1 root 622: uint32_t image_type = VDI_TYPE_DYNAMIC;
623: VdiHeader header;
624: size_t i;
625: size_t bmap_size;
626: uint32_t *bmap;
627:
628: logout("\n");
629:
630: /* Read out options. */
631: while (options && options->name) {
632: if (!strcmp(options->name, BLOCK_OPT_SIZE)) {
633: bytes = options->value.n;
634: #if defined(CONFIG_VDI_BLOCK_SIZE)
635: } else if (!strcmp(options->name, BLOCK_OPT_CLUSTER_SIZE)) {
636: if (options->value.n) {
637: /* TODO: Additional checks (SECTOR_SIZE * 2^n, ...). */
638: block_size = options->value.n;
639: }
640: #endif
641: #if defined(CONFIG_VDI_STATIC_IMAGE)
642: } else if (!strcmp(options->name, BLOCK_OPT_STATIC)) {
643: if (options->value.n) {
644: image_type = VDI_TYPE_STATIC;
645: }
646: #endif
647: }
648: options++;
649: }
650:
651: fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY | O_LARGEFILE,
652: 0644);
653: if (fd < 0) {
654: return -errno;
655: }
656:
1.1.1.2 root 657: /* We need enough blocks to store the given disk size,
658: so always round up. */
659: blocks = (bytes + block_size - 1) / block_size;
660:
1.1 root 661: bmap_size = blocks * sizeof(uint32_t);
662: bmap_size = ((bmap_size + SECTOR_SIZE - 1) & ~(SECTOR_SIZE -1));
663:
664: memset(&header, 0, sizeof(header));
665: pstrcpy(header.text, sizeof(header.text), VDI_TEXT);
666: header.signature = VDI_SIGNATURE;
667: header.version = VDI_VERSION_1_1;
668: header.header_size = 0x180;
669: header.image_type = image_type;
670: header.offset_bmap = 0x200;
671: header.offset_data = 0x200 + bmap_size;
672: header.sector_size = SECTOR_SIZE;
673: header.disk_size = bytes;
674: header.block_size = block_size;
675: header.blocks_in_image = blocks;
676: if (image_type == VDI_TYPE_STATIC) {
677: header.blocks_allocated = blocks;
678: }
679: uuid_generate(header.uuid_image);
680: uuid_generate(header.uuid_last_snap);
681: /* There is no need to set header.uuid_link or header.uuid_parent here. */
682: #if defined(CONFIG_VDI_DEBUG)
683: vdi_header_print(&header);
684: #endif
685: vdi_header_to_le(&header);
686: if (write(fd, &header, sizeof(header)) < 0) {
687: result = -errno;
688: }
689:
1.1.1.3 root 690: bmap = NULL;
691: if (bmap_size > 0) {
1.1.1.6 root 692: bmap = (uint32_t *)g_malloc0(bmap_size);
1.1.1.3 root 693: }
1.1 root 694: for (i = 0; i < blocks; i++) {
695: if (image_type == VDI_TYPE_STATIC) {
696: bmap[i] = i;
697: } else {
698: bmap[i] = VDI_UNALLOCATED;
699: }
700: }
701: if (write(fd, bmap, bmap_size) < 0) {
702: result = -errno;
703: }
1.1.1.6 root 704: g_free(bmap);
1.1 root 705: if (image_type == VDI_TYPE_STATIC) {
706: if (ftruncate(fd, sizeof(header) + bmap_size + blocks * block_size)) {
707: result = -errno;
708: }
709: }
710:
711: if (close(fd) < 0) {
712: result = -errno;
713: }
714:
715: return result;
716: }
717:
718: static void vdi_close(BlockDriverState *bs)
719: {
1.1.1.6 root 720: BDRVVdiState *s = bs->opaque;
721:
722: g_free(s->bmap);
723:
724: migrate_del_blocker(s->migration_blocker);
725: error_free(s->migration_blocker);
1.1 root 726: }
727:
728: static QEMUOptionParameter vdi_create_options[] = {
729: {
730: .name = BLOCK_OPT_SIZE,
731: .type = OPT_SIZE,
732: .help = "Virtual disk size"
733: },
734: #if defined(CONFIG_VDI_BLOCK_SIZE)
735: {
736: .name = BLOCK_OPT_CLUSTER_SIZE,
737: .type = OPT_SIZE,
1.1.1.5 root 738: .help = "VDI cluster (block) size",
739: .value = { .n = DEFAULT_CLUSTER_SIZE },
1.1 root 740: },
741: #endif
742: #if defined(CONFIG_VDI_STATIC_IMAGE)
743: {
744: .name = BLOCK_OPT_STATIC,
745: .type = OPT_FLAG,
746: .help = "VDI static (pre-allocated) image"
747: },
748: #endif
749: /* TODO: An additional option to set UUID values might be useful. */
750: { NULL }
751: };
752:
753: static BlockDriver bdrv_vdi = {
754: .format_name = "vdi",
755: .instance_size = sizeof(BDRVVdiState),
756: .bdrv_probe = vdi_probe,
757: .bdrv_open = vdi_open,
758: .bdrv_close = vdi_close,
759: .bdrv_create = vdi_create,
1.1.1.7 ! root 760: .bdrv_co_is_allocated = vdi_co_is_allocated,
1.1 root 761: .bdrv_make_empty = vdi_make_empty,
762:
1.1.1.7 ! root 763: .bdrv_read = vdi_co_read,
1.1 root 764: #if defined(CONFIG_VDI_WRITE)
1.1.1.7 ! root 765: .bdrv_write = vdi_co_write,
1.1 root 766: #endif
767:
768: .bdrv_get_info = vdi_get_info,
769:
770: .create_options = vdi_create_options,
771: .bdrv_check = vdi_check,
772: };
773:
774: static void bdrv_vdi_init(void)
775: {
776: logout("\n");
777: bdrv_register(&bdrv_vdi);
778: }
779:
780: block_init(bdrv_vdi_init);
This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.