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1.1 root 1: /*
2: * Block driver for the Virtual Disk Image (VDI) format
3: *
4: * Copyright (c) 2009 Stefan Weil
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"
55:
56: #if defined(CONFIG_UUID)
57: #include <uuid/uuid.h>
58: #else
59: /* TODO: move uuid emulation to some central place in QEMU. */
60: #include "sysemu.h" /* UUID_FMT */
61: typedef unsigned char uuid_t[16];
62: void uuid_generate(uuid_t out);
63: int uuid_is_null(const uuid_t uu);
64: void uuid_unparse(const uuid_t uu, char *out);
65: #endif
66:
67: /* Code configuration options. */
68:
69: /* Enable debug messages. */
70: //~ #define CONFIG_VDI_DEBUG
71:
72: /* Support write operations on VDI images. */
73: #define CONFIG_VDI_WRITE
74:
75: /* Support non-standard block (cluster) size. This is untested.
76: * Maybe it will be needed for very large images.
77: */
78: //~ #define CONFIG_VDI_BLOCK_SIZE
79:
80: /* Support static (fixed, pre-allocated) images. */
81: #define CONFIG_VDI_STATIC_IMAGE
82:
83: /* Command line option for static images. */
84: #define BLOCK_OPT_STATIC "static"
85:
86: #define KiB 1024
87: #define MiB (KiB * KiB)
88:
89: #define SECTOR_SIZE 512
1.1.1.5 ! root 90: #define DEFAULT_CLUSTER_SIZE (1 * MiB)
1.1 root 91:
92: #if defined(CONFIG_VDI_DEBUG)
93: #define logout(fmt, ...) \
94: fprintf(stderr, "vdi\t%-24s" fmt, __func__, ##__VA_ARGS__)
95: #else
96: #define logout(fmt, ...) ((void)0)
97: #endif
98:
99: /* Image signature. */
100: #define VDI_SIGNATURE 0xbeda107f
101:
102: /* Image version. */
103: #define VDI_VERSION_1_1 0x00010001
104:
105: /* Image type. */
106: #define VDI_TYPE_DYNAMIC 1
107: #define VDI_TYPE_STATIC 2
108:
109: /* Innotek / SUN images use these strings in header.text:
110: * "<<< innotek VirtualBox Disk Image >>>\n"
111: * "<<< Sun xVM VirtualBox Disk Image >>>\n"
112: * "<<< Sun VirtualBox Disk Image >>>\n"
113: * The value does not matter, so QEMU created images use a different text.
114: */
115: #define VDI_TEXT "<<< QEMU VM Virtual Disk Image >>>\n"
116:
1.1.1.5 ! root 117: /* Unallocated blocks use this index (no need to convert endianness). */
1.1 root 118: #define VDI_UNALLOCATED UINT32_MAX
119:
120: #if !defined(CONFIG_UUID)
121: void uuid_generate(uuid_t out)
122: {
1.1.1.4 root 123: memset(out, 0, sizeof(uuid_t));
1.1 root 124: }
125:
126: int uuid_is_null(const uuid_t uu)
127: {
128: uuid_t null_uuid = { 0 };
1.1.1.4 root 129: return memcmp(uu, null_uuid, sizeof(uuid_t)) == 0;
1.1 root 130: }
131:
132: void uuid_unparse(const uuid_t uu, char *out)
133: {
134: snprintf(out, 37, UUID_FMT,
135: uu[0], uu[1], uu[2], uu[3], uu[4], uu[5], uu[6], uu[7],
136: uu[8], uu[9], uu[10], uu[11], uu[12], uu[13], uu[14], uu[15]);
137: }
138: #endif
139:
140: typedef struct {
141: BlockDriverAIOCB common;
142: int64_t sector_num;
143: QEMUIOVector *qiov;
144: uint8_t *buf;
145: /* Total number of sectors. */
146: int nb_sectors;
147: /* Number of sectors for current AIO. */
148: int n_sectors;
149: /* New allocated block map entry. */
150: uint32_t bmap_first;
151: uint32_t bmap_last;
152: /* Buffer for new allocated block. */
153: void *block_buffer;
154: void *orig_buf;
1.1.1.5 ! root 155: bool is_write;
1.1 root 156: int header_modified;
157: BlockDriverAIOCB *hd_aiocb;
158: struct iovec hd_iov;
159: QEMUIOVector hd_qiov;
160: QEMUBH *bh;
161: } VdiAIOCB;
162:
163: typedef struct {
164: char text[0x40];
165: uint32_t signature;
166: uint32_t version;
167: uint32_t header_size;
168: uint32_t image_type;
169: uint32_t image_flags;
170: char description[256];
171: uint32_t offset_bmap;
172: uint32_t offset_data;
173: uint32_t cylinders; /* disk geometry, unused here */
174: uint32_t heads; /* disk geometry, unused here */
175: uint32_t sectors; /* disk geometry, unused here */
176: uint32_t sector_size;
177: uint32_t unused1;
178: uint64_t disk_size;
179: uint32_t block_size;
180: uint32_t block_extra; /* unused here */
181: uint32_t blocks_in_image;
182: uint32_t blocks_allocated;
183: uuid_t uuid_image;
184: uuid_t uuid_last_snap;
185: uuid_t uuid_link;
186: uuid_t uuid_parent;
187: uint64_t unused2[7];
188: } VdiHeader;
189:
190: typedef struct {
191: /* The block map entries are little endian (even in memory). */
192: uint32_t *bmap;
193: /* Size of block (bytes). */
194: uint32_t block_size;
195: /* Size of block (sectors). */
196: uint32_t block_sectors;
197: /* First sector of block map. */
198: uint32_t bmap_sector;
1.1.1.5 ! root 199: /* VDI header (converted to host endianness). */
1.1 root 200: VdiHeader header;
201: } BDRVVdiState;
202:
203: /* Change UUID from little endian (IPRT = VirtualBox format) to big endian
204: * format (network byte order, standard, see RFC 4122) and vice versa.
205: */
206: static void uuid_convert(uuid_t uuid)
207: {
208: bswap32s((uint32_t *)&uuid[0]);
209: bswap16s((uint16_t *)&uuid[4]);
210: bswap16s((uint16_t *)&uuid[6]);
211: }
212:
213: static void vdi_header_to_cpu(VdiHeader *header)
214: {
215: le32_to_cpus(&header->signature);
216: le32_to_cpus(&header->version);
217: le32_to_cpus(&header->header_size);
218: le32_to_cpus(&header->image_type);
219: le32_to_cpus(&header->image_flags);
220: le32_to_cpus(&header->offset_bmap);
221: le32_to_cpus(&header->offset_data);
222: le32_to_cpus(&header->cylinders);
223: le32_to_cpus(&header->heads);
224: le32_to_cpus(&header->sectors);
225: le32_to_cpus(&header->sector_size);
226: le64_to_cpus(&header->disk_size);
227: le32_to_cpus(&header->block_size);
228: le32_to_cpus(&header->block_extra);
229: le32_to_cpus(&header->blocks_in_image);
230: le32_to_cpus(&header->blocks_allocated);
231: uuid_convert(header->uuid_image);
232: uuid_convert(header->uuid_last_snap);
233: uuid_convert(header->uuid_link);
234: uuid_convert(header->uuid_parent);
235: }
236:
237: static void vdi_header_to_le(VdiHeader *header)
238: {
239: cpu_to_le32s(&header->signature);
240: cpu_to_le32s(&header->version);
241: cpu_to_le32s(&header->header_size);
242: cpu_to_le32s(&header->image_type);
243: cpu_to_le32s(&header->image_flags);
244: cpu_to_le32s(&header->offset_bmap);
245: cpu_to_le32s(&header->offset_data);
246: cpu_to_le32s(&header->cylinders);
247: cpu_to_le32s(&header->heads);
248: cpu_to_le32s(&header->sectors);
249: cpu_to_le32s(&header->sector_size);
250: cpu_to_le64s(&header->disk_size);
251: cpu_to_le32s(&header->block_size);
252: cpu_to_le32s(&header->block_extra);
253: cpu_to_le32s(&header->blocks_in_image);
254: cpu_to_le32s(&header->blocks_allocated);
255: cpu_to_le32s(&header->blocks_allocated);
256: uuid_convert(header->uuid_image);
257: uuid_convert(header->uuid_last_snap);
258: uuid_convert(header->uuid_link);
259: uuid_convert(header->uuid_parent);
260: }
261:
262: #if defined(CONFIG_VDI_DEBUG)
263: static void vdi_header_print(VdiHeader *header)
264: {
265: char uuid[37];
266: logout("text %s", header->text);
267: logout("signature 0x%04x\n", header->signature);
268: logout("header size 0x%04x\n", header->header_size);
269: logout("image type 0x%04x\n", header->image_type);
270: logout("image flags 0x%04x\n", header->image_flags);
271: logout("description %s\n", header->description);
272: logout("offset bmap 0x%04x\n", header->offset_bmap);
273: logout("offset data 0x%04x\n", header->offset_data);
274: logout("cylinders 0x%04x\n", header->cylinders);
275: logout("heads 0x%04x\n", header->heads);
276: logout("sectors 0x%04x\n", header->sectors);
277: logout("sector size 0x%04x\n", header->sector_size);
278: logout("image size 0x%" PRIx64 " B (%" PRIu64 " MiB)\n",
279: header->disk_size, header->disk_size / MiB);
280: logout("block size 0x%04x\n", header->block_size);
281: logout("block extra 0x%04x\n", header->block_extra);
282: logout("blocks tot. 0x%04x\n", header->blocks_in_image);
283: logout("blocks all. 0x%04x\n", header->blocks_allocated);
284: uuid_unparse(header->uuid_image, uuid);
285: logout("uuid image %s\n", uuid);
286: uuid_unparse(header->uuid_last_snap, uuid);
287: logout("uuid snap %s\n", uuid);
288: uuid_unparse(header->uuid_link, uuid);
289: logout("uuid link %s\n", uuid);
290: uuid_unparse(header->uuid_parent, uuid);
291: logout("uuid parent %s\n", uuid);
292: }
293: #endif
294:
1.1.1.3 root 295: static int vdi_check(BlockDriverState *bs, BdrvCheckResult *res)
1.1 root 296: {
297: /* TODO: additional checks possible. */
298: BDRVVdiState *s = (BDRVVdiState *)bs->opaque;
299: uint32_t blocks_allocated = 0;
300: uint32_t block;
301: uint32_t *bmap;
302: logout("\n");
303:
304: bmap = qemu_malloc(s->header.blocks_in_image * sizeof(uint32_t));
305: memset(bmap, 0xff, s->header.blocks_in_image * sizeof(uint32_t));
306:
307: /* Check block map and value of blocks_allocated. */
308: for (block = 0; block < s->header.blocks_in_image; block++) {
309: uint32_t bmap_entry = le32_to_cpu(s->bmap[block]);
310: if (bmap_entry != VDI_UNALLOCATED) {
311: if (bmap_entry < s->header.blocks_in_image) {
312: blocks_allocated++;
313: if (bmap[bmap_entry] == VDI_UNALLOCATED) {
314: bmap[bmap_entry] = bmap_entry;
315: } else {
316: fprintf(stderr, "ERROR: block index %" PRIu32
317: " also used by %" PRIu32 "\n", bmap[bmap_entry], bmap_entry);
1.1.1.3 root 318: res->corruptions++;
1.1 root 319: }
320: } else {
321: fprintf(stderr, "ERROR: block index %" PRIu32
322: " too large, is %" PRIu32 "\n", block, bmap_entry);
1.1.1.3 root 323: res->corruptions++;
1.1 root 324: }
325: }
326: }
327: if (blocks_allocated != s->header.blocks_allocated) {
328: fprintf(stderr, "ERROR: allocated blocks mismatch, is %" PRIu32
329: ", should be %" PRIu32 "\n",
330: blocks_allocated, s->header.blocks_allocated);
1.1.1.3 root 331: res->corruptions++;
1.1 root 332: }
333:
334: qemu_free(bmap);
335:
1.1.1.3 root 336: return 0;
1.1 root 337: }
338:
339: static int vdi_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
340: {
341: /* TODO: vdi_get_info would be needed for machine snapshots.
342: vm_state_offset is still missing. */
343: BDRVVdiState *s = (BDRVVdiState *)bs->opaque;
344: logout("\n");
345: bdi->cluster_size = s->block_size;
346: bdi->vm_state_offset = 0;
347: return 0;
348: }
349:
350: static int vdi_make_empty(BlockDriverState *bs)
351: {
352: /* TODO: missing code. */
353: logout("\n");
354: /* The return value for missing code must be 0, see block.c. */
355: return 0;
356: }
357:
358: static int vdi_probe(const uint8_t *buf, int buf_size, const char *filename)
359: {
360: const VdiHeader *header = (const VdiHeader *)buf;
361: int result = 0;
362:
363: logout("\n");
364:
365: if (buf_size < sizeof(*header)) {
366: /* Header too small, no VDI. */
367: } else if (le32_to_cpu(header->signature) == VDI_SIGNATURE) {
368: result = 100;
369: }
370:
371: if (result == 0) {
372: logout("no vdi image\n");
373: } else {
374: logout("%s", header->text);
375: }
376:
377: return result;
378: }
379:
1.1.1.3 root 380: static int vdi_open(BlockDriverState *bs, int flags)
1.1 root 381: {
382: BDRVVdiState *s = bs->opaque;
383: VdiHeader header;
384: size_t bmap_size;
385:
386: logout("\n");
387:
1.1.1.3 root 388: if (bdrv_read(bs->file, 0, (uint8_t *)&header, 1) < 0) {
1.1 root 389: goto fail;
390: }
391:
392: vdi_header_to_cpu(&header);
393: #if defined(CONFIG_VDI_DEBUG)
394: vdi_header_print(&header);
395: #endif
396:
1.1.1.2 root 397: if (header.disk_size % SECTOR_SIZE != 0) {
398: /* 'VBoxManage convertfromraw' can create images with odd disk sizes.
399: We accept them but round the disk size to the next multiple of
400: SECTOR_SIZE. */
401: logout("odd disk size %" PRIu64 " B, round up\n", header.disk_size);
402: header.disk_size += SECTOR_SIZE - 1;
403: header.disk_size &= ~(SECTOR_SIZE - 1);
404: }
405:
1.1 root 406: if (header.version != VDI_VERSION_1_1) {
407: logout("unsupported version %u.%u\n",
408: header.version >> 16, header.version & 0xffff);
409: goto fail;
410: } else if (header.offset_bmap % SECTOR_SIZE != 0) {
411: /* We only support block maps which start on a sector boundary. */
412: logout("unsupported block map offset 0x%x B\n", header.offset_bmap);
413: goto fail;
414: } else if (header.offset_data % SECTOR_SIZE != 0) {
415: /* We only support data blocks which start on a sector boundary. */
416: logout("unsupported data offset 0x%x B\n", header.offset_data);
417: goto fail;
418: } else if (header.sector_size != SECTOR_SIZE) {
419: logout("unsupported sector size %u B\n", header.sector_size);
420: goto fail;
421: } else if (header.block_size != 1 * MiB) {
422: logout("unsupported block size %u B\n", header.block_size);
423: goto fail;
1.1.1.2 root 424: } else if (header.disk_size >
1.1 root 425: (uint64_t)header.blocks_in_image * header.block_size) {
1.1.1.2 root 426: logout("unsupported disk size %" PRIu64 " B\n", header.disk_size);
1.1 root 427: goto fail;
428: } else if (!uuid_is_null(header.uuid_link)) {
429: logout("link uuid != 0, unsupported\n");
430: goto fail;
431: } else if (!uuid_is_null(header.uuid_parent)) {
432: logout("parent uuid != 0, unsupported\n");
433: goto fail;
434: }
435:
436: bs->total_sectors = header.disk_size / SECTOR_SIZE;
437:
438: s->block_size = header.block_size;
439: s->block_sectors = header.block_size / SECTOR_SIZE;
440: s->bmap_sector = header.offset_bmap / SECTOR_SIZE;
441: s->header = header;
442:
443: bmap_size = header.blocks_in_image * sizeof(uint32_t);
444: bmap_size = (bmap_size + SECTOR_SIZE - 1) / SECTOR_SIZE;
1.1.1.3 root 445: if (bmap_size > 0) {
446: s->bmap = qemu_malloc(bmap_size * SECTOR_SIZE);
447: }
448: if (bdrv_read(bs->file, s->bmap_sector, (uint8_t *)s->bmap, bmap_size) < 0) {
1.1 root 449: goto fail_free_bmap;
450: }
451:
452: return 0;
453:
454: fail_free_bmap:
455: qemu_free(s->bmap);
456:
457: fail:
458: return -1;
459: }
460:
461: static int vdi_is_allocated(BlockDriverState *bs, int64_t sector_num,
462: int nb_sectors, int *pnum)
463: {
464: /* TODO: Check for too large sector_num (in bdrv_is_allocated or here). */
465: BDRVVdiState *s = (BDRVVdiState *)bs->opaque;
466: size_t bmap_index = sector_num / s->block_sectors;
467: size_t sector_in_block = sector_num % s->block_sectors;
468: int n_sectors = s->block_sectors - sector_in_block;
469: uint32_t bmap_entry = le32_to_cpu(s->bmap[bmap_index]);
470: logout("%p, %" PRId64 ", %d, %p\n", bs, sector_num, nb_sectors, pnum);
471: if (n_sectors > nb_sectors) {
472: n_sectors = nb_sectors;
473: }
474: *pnum = n_sectors;
475: return bmap_entry != VDI_UNALLOCATED;
476: }
477:
478: static void vdi_aio_cancel(BlockDriverAIOCB *blockacb)
479: {
480: /* TODO: This code is untested. How can I get it executed? */
1.1.1.3 root 481: VdiAIOCB *acb = container_of(blockacb, VdiAIOCB, common);
1.1 root 482: logout("\n");
483: if (acb->hd_aiocb) {
484: bdrv_aio_cancel(acb->hd_aiocb);
485: }
486: qemu_aio_release(acb);
487: }
488:
489: static AIOPool vdi_aio_pool = {
490: .aiocb_size = sizeof(VdiAIOCB),
491: .cancel = vdi_aio_cancel,
492: };
493:
494: static VdiAIOCB *vdi_aio_setup(BlockDriverState *bs, int64_t sector_num,
495: QEMUIOVector *qiov, int nb_sectors,
496: BlockDriverCompletionFunc *cb, void *opaque, int is_write)
497: {
498: VdiAIOCB *acb;
499:
500: logout("%p, %" PRId64 ", %p, %d, %p, %p, %d\n",
501: bs, sector_num, qiov, nb_sectors, cb, opaque, is_write);
502:
503: acb = qemu_aio_get(&vdi_aio_pool, bs, cb, opaque);
504: if (acb) {
505: acb->hd_aiocb = NULL;
506: acb->sector_num = sector_num;
507: acb->qiov = qiov;
1.1.1.5 ! root 508: acb->is_write = is_write;
! 509:
1.1 root 510: if (qiov->niov > 1) {
511: acb->buf = qemu_blockalign(bs, qiov->size);
512: acb->orig_buf = acb->buf;
513: if (is_write) {
514: qemu_iovec_to_buffer(qiov, acb->buf);
515: }
516: } else {
517: acb->buf = (uint8_t *)qiov->iov->iov_base;
518: }
519: acb->nb_sectors = nb_sectors;
520: acb->n_sectors = 0;
521: acb->bmap_first = VDI_UNALLOCATED;
522: acb->bmap_last = VDI_UNALLOCATED;
523: acb->block_buffer = NULL;
524: acb->header_modified = 0;
525: }
526: return acb;
527: }
528:
529: static int vdi_schedule_bh(QEMUBHFunc *cb, VdiAIOCB *acb)
530: {
531: logout("\n");
532:
533: if (acb->bh) {
534: return -EIO;
535: }
536:
537: acb->bh = qemu_bh_new(cb, acb);
538: if (!acb->bh) {
539: return -EIO;
540: }
541:
542: qemu_bh_schedule(acb->bh);
543:
544: return 0;
545: }
546:
547: static void vdi_aio_read_cb(void *opaque, int ret);
1.1.1.5 ! root 548: static void vdi_aio_write_cb(void *opaque, int ret);
1.1 root 549:
1.1.1.5 ! root 550: static void vdi_aio_rw_bh(void *opaque)
1.1 root 551: {
552: VdiAIOCB *acb = opaque;
553: logout("\n");
554: qemu_bh_delete(acb->bh);
555: acb->bh = NULL;
1.1.1.5 ! root 556:
! 557: if (acb->is_write) {
! 558: vdi_aio_write_cb(opaque, 0);
! 559: } else {
! 560: vdi_aio_read_cb(opaque, 0);
! 561: }
1.1 root 562: }
563:
564: static void vdi_aio_read_cb(void *opaque, int ret)
565: {
566: VdiAIOCB *acb = opaque;
567: BlockDriverState *bs = acb->common.bs;
568: BDRVVdiState *s = bs->opaque;
569: uint32_t bmap_entry;
570: uint32_t block_index;
571: uint32_t sector_in_block;
572: uint32_t n_sectors;
573:
574: logout("%u sectors read\n", acb->n_sectors);
575:
576: acb->hd_aiocb = NULL;
577:
578: if (ret < 0) {
579: goto done;
580: }
581:
582: acb->nb_sectors -= acb->n_sectors;
583:
584: if (acb->nb_sectors == 0) {
585: /* request completed */
586: ret = 0;
587: goto done;
588: }
589:
590: acb->sector_num += acb->n_sectors;
591: acb->buf += acb->n_sectors * SECTOR_SIZE;
592:
593: block_index = acb->sector_num / s->block_sectors;
594: sector_in_block = acb->sector_num % s->block_sectors;
595: n_sectors = s->block_sectors - sector_in_block;
596: if (n_sectors > acb->nb_sectors) {
597: n_sectors = acb->nb_sectors;
598: }
599:
600: logout("will read %u sectors starting at sector %" PRIu64 "\n",
601: n_sectors, acb->sector_num);
602:
603: /* prepare next AIO request */
604: acb->n_sectors = n_sectors;
605: bmap_entry = le32_to_cpu(s->bmap[block_index]);
606: if (bmap_entry == VDI_UNALLOCATED) {
607: /* Block not allocated, return zeros, no need to wait. */
608: memset(acb->buf, 0, n_sectors * SECTOR_SIZE);
1.1.1.5 ! root 609: ret = vdi_schedule_bh(vdi_aio_rw_bh, acb);
1.1 root 610: if (ret < 0) {
611: goto done;
612: }
613: } else {
614: uint64_t offset = s->header.offset_data / SECTOR_SIZE +
615: (uint64_t)bmap_entry * s->block_sectors +
616: sector_in_block;
617: acb->hd_iov.iov_base = (void *)acb->buf;
618: acb->hd_iov.iov_len = n_sectors * SECTOR_SIZE;
619: qemu_iovec_init_external(&acb->hd_qiov, &acb->hd_iov, 1);
1.1.1.3 root 620: acb->hd_aiocb = bdrv_aio_readv(bs->file, offset, &acb->hd_qiov,
1.1 root 621: n_sectors, vdi_aio_read_cb, acb);
622: if (acb->hd_aiocb == NULL) {
1.1.1.5 ! root 623: ret = -EIO;
1.1 root 624: goto done;
625: }
626: }
627: return;
628: done:
629: if (acb->qiov->niov > 1) {
630: qemu_iovec_from_buffer(acb->qiov, acb->orig_buf, acb->qiov->size);
631: qemu_vfree(acb->orig_buf);
632: }
633: acb->common.cb(acb->common.opaque, ret);
634: qemu_aio_release(acb);
635: }
636:
637: static BlockDriverAIOCB *vdi_aio_readv(BlockDriverState *bs,
638: int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
639: BlockDriverCompletionFunc *cb, void *opaque)
640: {
641: VdiAIOCB *acb;
1.1.1.5 ! root 642: int ret;
! 643:
1.1 root 644: logout("\n");
645: acb = vdi_aio_setup(bs, sector_num, qiov, nb_sectors, cb, opaque, 0);
646: if (!acb) {
647: return NULL;
648: }
1.1.1.5 ! root 649:
! 650: ret = vdi_schedule_bh(vdi_aio_rw_bh, acb);
! 651: if (ret < 0) {
! 652: if (acb->qiov->niov > 1) {
! 653: qemu_vfree(acb->orig_buf);
! 654: }
! 655: qemu_aio_release(acb);
! 656: return NULL;
! 657: }
! 658:
1.1 root 659: return &acb->common;
660: }
661:
662: static void vdi_aio_write_cb(void *opaque, int ret)
663: {
664: VdiAIOCB *acb = opaque;
665: BlockDriverState *bs = acb->common.bs;
666: BDRVVdiState *s = bs->opaque;
667: uint32_t bmap_entry;
668: uint32_t block_index;
669: uint32_t sector_in_block;
670: uint32_t n_sectors;
671:
672: acb->hd_aiocb = NULL;
673:
674: if (ret < 0) {
675: goto done;
676: }
677:
678: acb->nb_sectors -= acb->n_sectors;
679: acb->sector_num += acb->n_sectors;
680: acb->buf += acb->n_sectors * SECTOR_SIZE;
681:
682: if (acb->nb_sectors == 0) {
683: logout("finished data write\n");
684: acb->n_sectors = 0;
685: if (acb->header_modified) {
686: VdiHeader *header = acb->block_buffer;
687: logout("now writing modified header\n");
688: assert(acb->bmap_first != VDI_UNALLOCATED);
689: *header = s->header;
690: vdi_header_to_le(header);
691: acb->header_modified = 0;
692: acb->hd_iov.iov_base = acb->block_buffer;
693: acb->hd_iov.iov_len = SECTOR_SIZE;
694: qemu_iovec_init_external(&acb->hd_qiov, &acb->hd_iov, 1);
1.1.1.3 root 695: acb->hd_aiocb = bdrv_aio_writev(bs->file, 0, &acb->hd_qiov, 1,
1.1 root 696: vdi_aio_write_cb, acb);
697: if (acb->hd_aiocb == NULL) {
1.1.1.5 ! root 698: ret = -EIO;
1.1 root 699: goto done;
700: }
701: return;
702: } else if (acb->bmap_first != VDI_UNALLOCATED) {
703: /* One or more new blocks were allocated. */
704: uint64_t offset;
705: uint32_t bmap_first;
706: uint32_t bmap_last;
707: qemu_free(acb->block_buffer);
708: acb->block_buffer = NULL;
709: bmap_first = acb->bmap_first;
710: bmap_last = acb->bmap_last;
711: logout("now writing modified block map entry %u...%u\n",
712: bmap_first, bmap_last);
713: /* Write modified sectors from block map. */
714: bmap_first /= (SECTOR_SIZE / sizeof(uint32_t));
715: bmap_last /= (SECTOR_SIZE / sizeof(uint32_t));
716: n_sectors = bmap_last - bmap_first + 1;
717: offset = s->bmap_sector + bmap_first;
718: acb->bmap_first = VDI_UNALLOCATED;
719: acb->hd_iov.iov_base = (void *)((uint8_t *)&s->bmap[0] +
720: bmap_first * SECTOR_SIZE);
721: acb->hd_iov.iov_len = n_sectors * SECTOR_SIZE;
722: qemu_iovec_init_external(&acb->hd_qiov, &acb->hd_iov, 1);
723: logout("will write %u block map sectors starting from entry %u\n",
724: n_sectors, bmap_first);
1.1.1.3 root 725: acb->hd_aiocb = bdrv_aio_writev(bs->file, offset, &acb->hd_qiov,
1.1 root 726: n_sectors, vdi_aio_write_cb, acb);
727: if (acb->hd_aiocb == NULL) {
1.1.1.5 ! root 728: ret = -EIO;
1.1 root 729: goto done;
730: }
731: return;
732: }
733: ret = 0;
734: goto done;
735: }
736:
737: logout("%u sectors written\n", acb->n_sectors);
738:
739: block_index = acb->sector_num / s->block_sectors;
740: sector_in_block = acb->sector_num % s->block_sectors;
741: n_sectors = s->block_sectors - sector_in_block;
742: if (n_sectors > acb->nb_sectors) {
743: n_sectors = acb->nb_sectors;
744: }
745:
746: logout("will write %u sectors starting at sector %" PRIu64 "\n",
747: n_sectors, acb->sector_num);
748:
749: /* prepare next AIO request */
750: acb->n_sectors = n_sectors;
751: bmap_entry = le32_to_cpu(s->bmap[block_index]);
752: if (bmap_entry == VDI_UNALLOCATED) {
753: /* Allocate new block and write to it. */
754: uint64_t offset;
755: uint8_t *block;
756: bmap_entry = s->header.blocks_allocated;
757: s->bmap[block_index] = cpu_to_le32(bmap_entry);
758: s->header.blocks_allocated++;
759: offset = s->header.offset_data / SECTOR_SIZE +
760: (uint64_t)bmap_entry * s->block_sectors;
761: block = acb->block_buffer;
762: if (block == NULL) {
763: block = qemu_mallocz(s->block_size);
764: acb->block_buffer = block;
765: acb->bmap_first = block_index;
766: assert(!acb->header_modified);
767: acb->header_modified = 1;
768: }
769: acb->bmap_last = block_index;
770: memcpy(block + sector_in_block * SECTOR_SIZE,
771: acb->buf, n_sectors * SECTOR_SIZE);
772: acb->hd_iov.iov_base = (void *)block;
773: acb->hd_iov.iov_len = s->block_size;
774: qemu_iovec_init_external(&acb->hd_qiov, &acb->hd_iov, 1);
1.1.1.3 root 775: acb->hd_aiocb = bdrv_aio_writev(bs->file, offset,
1.1 root 776: &acb->hd_qiov, s->block_sectors,
777: vdi_aio_write_cb, acb);
778: if (acb->hd_aiocb == NULL) {
1.1.1.5 ! root 779: ret = -EIO;
1.1 root 780: goto done;
781: }
782: } else {
783: uint64_t offset = s->header.offset_data / SECTOR_SIZE +
784: (uint64_t)bmap_entry * s->block_sectors +
785: sector_in_block;
786: acb->hd_iov.iov_base = (void *)acb->buf;
787: acb->hd_iov.iov_len = n_sectors * SECTOR_SIZE;
788: qemu_iovec_init_external(&acb->hd_qiov, &acb->hd_iov, 1);
1.1.1.3 root 789: acb->hd_aiocb = bdrv_aio_writev(bs->file, offset, &acb->hd_qiov,
1.1 root 790: n_sectors, vdi_aio_write_cb, acb);
791: if (acb->hd_aiocb == NULL) {
1.1.1.5 ! root 792: ret = -EIO;
1.1 root 793: goto done;
794: }
795: }
796:
797: return;
798:
799: done:
800: if (acb->qiov->niov > 1) {
801: qemu_vfree(acb->orig_buf);
802: }
803: acb->common.cb(acb->common.opaque, ret);
804: qemu_aio_release(acb);
805: }
806:
807: static BlockDriverAIOCB *vdi_aio_writev(BlockDriverState *bs,
808: int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
809: BlockDriverCompletionFunc *cb, void *opaque)
810: {
811: VdiAIOCB *acb;
1.1.1.5 ! root 812: int ret;
! 813:
1.1 root 814: logout("\n");
815: acb = vdi_aio_setup(bs, sector_num, qiov, nb_sectors, cb, opaque, 1);
816: if (!acb) {
817: return NULL;
818: }
1.1.1.5 ! root 819:
! 820: ret = vdi_schedule_bh(vdi_aio_rw_bh, acb);
! 821: if (ret < 0) {
! 822: if (acb->qiov->niov > 1) {
! 823: qemu_vfree(acb->orig_buf);
! 824: }
! 825: qemu_aio_release(acb);
! 826: return NULL;
! 827: }
! 828:
1.1 root 829: return &acb->common;
830: }
831:
832: static int vdi_create(const char *filename, QEMUOptionParameter *options)
833: {
834: int fd;
835: int result = 0;
836: uint64_t bytes = 0;
837: uint32_t blocks;
1.1.1.5 ! root 838: size_t block_size = DEFAULT_CLUSTER_SIZE;
1.1 root 839: uint32_t image_type = VDI_TYPE_DYNAMIC;
840: VdiHeader header;
841: size_t i;
842: size_t bmap_size;
843: uint32_t *bmap;
844:
845: logout("\n");
846:
847: /* Read out options. */
848: while (options && options->name) {
849: if (!strcmp(options->name, BLOCK_OPT_SIZE)) {
850: bytes = options->value.n;
851: #if defined(CONFIG_VDI_BLOCK_SIZE)
852: } else if (!strcmp(options->name, BLOCK_OPT_CLUSTER_SIZE)) {
853: if (options->value.n) {
854: /* TODO: Additional checks (SECTOR_SIZE * 2^n, ...). */
855: block_size = options->value.n;
856: }
857: #endif
858: #if defined(CONFIG_VDI_STATIC_IMAGE)
859: } else if (!strcmp(options->name, BLOCK_OPT_STATIC)) {
860: if (options->value.n) {
861: image_type = VDI_TYPE_STATIC;
862: }
863: #endif
864: }
865: options++;
866: }
867:
868: fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY | O_LARGEFILE,
869: 0644);
870: if (fd < 0) {
871: return -errno;
872: }
873:
1.1.1.2 root 874: /* We need enough blocks to store the given disk size,
875: so always round up. */
876: blocks = (bytes + block_size - 1) / block_size;
877:
1.1 root 878: bmap_size = blocks * sizeof(uint32_t);
879: bmap_size = ((bmap_size + SECTOR_SIZE - 1) & ~(SECTOR_SIZE -1));
880:
881: memset(&header, 0, sizeof(header));
882: pstrcpy(header.text, sizeof(header.text), VDI_TEXT);
883: header.signature = VDI_SIGNATURE;
884: header.version = VDI_VERSION_1_1;
885: header.header_size = 0x180;
886: header.image_type = image_type;
887: header.offset_bmap = 0x200;
888: header.offset_data = 0x200 + bmap_size;
889: header.sector_size = SECTOR_SIZE;
890: header.disk_size = bytes;
891: header.block_size = block_size;
892: header.blocks_in_image = blocks;
893: if (image_type == VDI_TYPE_STATIC) {
894: header.blocks_allocated = blocks;
895: }
896: uuid_generate(header.uuid_image);
897: uuid_generate(header.uuid_last_snap);
898: /* There is no need to set header.uuid_link or header.uuid_parent here. */
899: #if defined(CONFIG_VDI_DEBUG)
900: vdi_header_print(&header);
901: #endif
902: vdi_header_to_le(&header);
903: if (write(fd, &header, sizeof(header)) < 0) {
904: result = -errno;
905: }
906:
1.1.1.3 root 907: bmap = NULL;
908: if (bmap_size > 0) {
909: bmap = (uint32_t *)qemu_mallocz(bmap_size);
910: }
1.1 root 911: for (i = 0; i < blocks; i++) {
912: if (image_type == VDI_TYPE_STATIC) {
913: bmap[i] = i;
914: } else {
915: bmap[i] = VDI_UNALLOCATED;
916: }
917: }
918: if (write(fd, bmap, bmap_size) < 0) {
919: result = -errno;
920: }
921: qemu_free(bmap);
922: if (image_type == VDI_TYPE_STATIC) {
923: if (ftruncate(fd, sizeof(header) + bmap_size + blocks * block_size)) {
924: result = -errno;
925: }
926: }
927:
928: if (close(fd) < 0) {
929: result = -errno;
930: }
931:
932: return result;
933: }
934:
935: static void vdi_close(BlockDriverState *bs)
936: {
937: }
938:
1.1.1.4 root 939: static int vdi_flush(BlockDriverState *bs)
1.1 root 940: {
941: logout("\n");
1.1.1.4 root 942: return bdrv_flush(bs->file);
1.1 root 943: }
944:
945:
946: static QEMUOptionParameter vdi_create_options[] = {
947: {
948: .name = BLOCK_OPT_SIZE,
949: .type = OPT_SIZE,
950: .help = "Virtual disk size"
951: },
952: #if defined(CONFIG_VDI_BLOCK_SIZE)
953: {
954: .name = BLOCK_OPT_CLUSTER_SIZE,
955: .type = OPT_SIZE,
1.1.1.5 ! root 956: .help = "VDI cluster (block) size",
! 957: .value = { .n = DEFAULT_CLUSTER_SIZE },
1.1 root 958: },
959: #endif
960: #if defined(CONFIG_VDI_STATIC_IMAGE)
961: {
962: .name = BLOCK_OPT_STATIC,
963: .type = OPT_FLAG,
964: .help = "VDI static (pre-allocated) image"
965: },
966: #endif
967: /* TODO: An additional option to set UUID values might be useful. */
968: { NULL }
969: };
970:
971: static BlockDriver bdrv_vdi = {
972: .format_name = "vdi",
973: .instance_size = sizeof(BDRVVdiState),
974: .bdrv_probe = vdi_probe,
975: .bdrv_open = vdi_open,
976: .bdrv_close = vdi_close,
977: .bdrv_create = vdi_create,
978: .bdrv_flush = vdi_flush,
979: .bdrv_is_allocated = vdi_is_allocated,
980: .bdrv_make_empty = vdi_make_empty,
981:
982: .bdrv_aio_readv = vdi_aio_readv,
983: #if defined(CONFIG_VDI_WRITE)
984: .bdrv_aio_writev = vdi_aio_writev,
985: #endif
986:
987: .bdrv_get_info = vdi_get_info,
988:
989: .create_options = vdi_create_options,
990: .bdrv_check = vdi_check,
991: };
992:
993: static void bdrv_vdi_init(void)
994: {
995: logout("\n");
996: bdrv_register(&bdrv_vdi);
997: }
998:
999: block_init(bdrv_vdi_init);
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