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1.1 root 1: /*
2: * Block driver for the QCOW version 2 format
3: *
4: * Copyright (c) 2004-2006 Fabrice Bellard
5: *
6: * Permission is hereby granted, free of charge, to any person obtaining a copy
7: * of this software and associated documentation files (the "Software"), to deal
8: * in the Software without restriction, including without limitation the rights
9: * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10: * copies of the Software, and to permit persons to whom the Software is
11: * furnished to do so, subject to the following conditions:
12: *
13: * The above copyright notice and this permission notice shall be included in
14: * all copies or substantial portions of the Software.
15: *
16: * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17: * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18: * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19: * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20: * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21: * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
22: * THE SOFTWARE.
23: */
24: #include "qemu-common.h"
25: #include "block_int.h"
26: #include "module.h"
27: #include <zlib.h>
28: #include "aes.h"
29: #include "block/qcow2.h"
1.1.1.7 root 30: #include "qemu-error.h"
31: #include "qerror.h"
1.1 root 32:
33: /*
34: Differences with QCOW:
35:
36: - Support for multiple incremental snapshots.
37: - Memory management by reference counts.
38: - Clusters which have a reference count of one have the bit
39: QCOW_OFLAG_COPIED to optimize write performance.
40: - Size of compressed clusters is stored in sectors to reduce bit usage
41: in the cluster offsets.
42: - Support for storing additional data (such as the VM state) in the
43: snapshots.
44: - If a backing store is used, the cluster size is not constrained
45: (could be backported to QCOW).
46: - L2 tables have always a size of one cluster.
47: */
48:
49:
50: typedef struct {
51: uint32_t magic;
52: uint32_t len;
53: } QCowExtension;
1.1.1.7 root 54: #define QCOW2_EXT_MAGIC_END 0
55: #define QCOW2_EXT_MAGIC_BACKING_FORMAT 0xE2792ACA
1.1 root 56:
1.1.1.7 root 57: static int qcow2_probe(const uint8_t *buf, int buf_size, const char *filename)
1.1 root 58: {
59: const QCowHeader *cow_header = (const void *)buf;
60:
61: if (buf_size >= sizeof(QCowHeader) &&
62: be32_to_cpu(cow_header->magic) == QCOW_MAGIC &&
1.1.1.7 root 63: be32_to_cpu(cow_header->version) >= QCOW_VERSION)
1.1 root 64: return 100;
65: else
66: return 0;
67: }
68:
69:
70: /*
71: * read qcow2 extension and fill bs
72: * start reading from start_offset
73: * finish reading upon magic of value 0 or when end_offset reached
74: * unknown magic is skipped (future extension this version knows nothing about)
75: * return 0 upon success, non-0 otherwise
76: */
1.1.1.7 root 77: static int qcow2_read_extensions(BlockDriverState *bs, uint64_t start_offset,
78: uint64_t end_offset)
1.1 root 79: {
80: QCowExtension ext;
81: uint64_t offset;
82:
83: #ifdef DEBUG_EXT
1.1.1.7 root 84: printf("qcow2_read_extensions: start=%ld end=%ld\n", start_offset, end_offset);
1.1 root 85: #endif
86: offset = start_offset;
87: while (offset < end_offset) {
88:
89: #ifdef DEBUG_EXT
1.1.1.9 ! root 90: BDRVQcowState *s = bs->opaque;
1.1 root 91: /* Sanity check */
92: if (offset > s->cluster_size)
1.1.1.7 root 93: printf("qcow2_read_extension: suspicious offset %lu\n", offset);
1.1 root 94:
95: printf("attemting to read extended header in offset %lu\n", offset);
96: #endif
97:
1.1.1.6 root 98: if (bdrv_pread(bs->file, offset, &ext, sizeof(ext)) != sizeof(ext)) {
1.1.1.7 root 99: fprintf(stderr, "qcow2_read_extension: ERROR: "
1.1.1.6 root 100: "pread fail from offset %" PRIu64 "\n",
101: offset);
1.1 root 102: return 1;
103: }
104: be32_to_cpus(&ext.magic);
105: be32_to_cpus(&ext.len);
106: offset += sizeof(ext);
107: #ifdef DEBUG_EXT
108: printf("ext.magic = 0x%x\n", ext.magic);
109: #endif
110: switch (ext.magic) {
1.1.1.7 root 111: case QCOW2_EXT_MAGIC_END:
1.1 root 112: return 0;
113:
1.1.1.7 root 114: case QCOW2_EXT_MAGIC_BACKING_FORMAT:
1.1 root 115: if (ext.len >= sizeof(bs->backing_format)) {
116: fprintf(stderr, "ERROR: ext_backing_format: len=%u too large"
117: " (>=%zu)\n",
118: ext.len, sizeof(bs->backing_format));
119: return 2;
120: }
1.1.1.6 root 121: if (bdrv_pread(bs->file, offset , bs->backing_format,
1.1 root 122: ext.len) != ext.len)
123: return 3;
124: bs->backing_format[ext.len] = '\0';
125: #ifdef DEBUG_EXT
126: printf("Qcow2: Got format extension %s\n", bs->backing_format);
127: #endif
1.1.1.2 root 128: offset = ((offset + ext.len + 7) & ~7);
1.1 root 129: break;
130:
131: default:
132: /* unknown magic -- just skip it */
1.1.1.2 root 133: offset = ((offset + ext.len + 7) & ~7);
1.1 root 134: break;
135: }
136: }
137:
138: return 0;
139: }
140:
141:
1.1.1.7 root 142: static int qcow2_open(BlockDriverState *bs, int flags)
1.1 root 143: {
144: BDRVQcowState *s = bs->opaque;
1.1.1.7 root 145: int len, i, ret = 0;
1.1 root 146: QCowHeader header;
147: uint64_t ext_end;
1.1.1.7 root 148: bool writethrough;
1.1 root 149:
1.1.1.7 root 150: ret = bdrv_pread(bs->file, 0, &header, sizeof(header));
151: if (ret < 0) {
1.1 root 152: goto fail;
1.1.1.7 root 153: }
1.1 root 154: be32_to_cpus(&header.magic);
155: be32_to_cpus(&header.version);
156: be64_to_cpus(&header.backing_file_offset);
157: be32_to_cpus(&header.backing_file_size);
158: be64_to_cpus(&header.size);
159: be32_to_cpus(&header.cluster_bits);
160: be32_to_cpus(&header.crypt_method);
161: be64_to_cpus(&header.l1_table_offset);
162: be32_to_cpus(&header.l1_size);
163: be64_to_cpus(&header.refcount_table_offset);
164: be32_to_cpus(&header.refcount_table_clusters);
165: be64_to_cpus(&header.snapshots_offset);
166: be32_to_cpus(&header.nb_snapshots);
167:
1.1.1.7 root 168: if (header.magic != QCOW_MAGIC) {
169: ret = -EINVAL;
170: goto fail;
171: }
172: if (header.version != QCOW_VERSION) {
173: char version[64];
174: snprintf(version, sizeof(version), "QCOW version %d", header.version);
175: qerror_report(QERR_UNKNOWN_BLOCK_FORMAT_FEATURE,
176: bs->device_name, "qcow2", version);
177: ret = -ENOTSUP;
1.1 root 178: goto fail;
1.1.1.7 root 179: }
1.1.1.2 root 180: if (header.cluster_bits < MIN_CLUSTER_BITS ||
1.1.1.7 root 181: header.cluster_bits > MAX_CLUSTER_BITS) {
182: ret = -EINVAL;
1.1 root 183: goto fail;
1.1.1.7 root 184: }
185: if (header.crypt_method > QCOW_CRYPT_AES) {
186: ret = -EINVAL;
1.1 root 187: goto fail;
1.1.1.7 root 188: }
1.1 root 189: s->crypt_method_header = header.crypt_method;
1.1.1.7 root 190: if (s->crypt_method_header) {
1.1 root 191: bs->encrypted = 1;
1.1.1.7 root 192: }
1.1 root 193: s->cluster_bits = header.cluster_bits;
194: s->cluster_size = 1 << s->cluster_bits;
195: s->cluster_sectors = 1 << (s->cluster_bits - 9);
196: s->l2_bits = s->cluster_bits - 3; /* L2 is always one cluster */
197: s->l2_size = 1 << s->l2_bits;
198: bs->total_sectors = header.size / 512;
199: s->csize_shift = (62 - (s->cluster_bits - 8));
200: s->csize_mask = (1 << (s->cluster_bits - 8)) - 1;
201: s->cluster_offset_mask = (1LL << s->csize_shift) - 1;
202: s->refcount_table_offset = header.refcount_table_offset;
203: s->refcount_table_size =
204: header.refcount_table_clusters << (s->cluster_bits - 3);
205:
206: s->snapshots_offset = header.snapshots_offset;
207: s->nb_snapshots = header.nb_snapshots;
208:
209: /* read the level 1 table */
210: s->l1_size = header.l1_size;
1.1.1.6 root 211: s->l1_vm_state_index = size_to_l1(s, header.size);
1.1 root 212: /* the L1 table must contain at least enough entries to put
213: header.size bytes */
1.1.1.7 root 214: if (s->l1_size < s->l1_vm_state_index) {
215: ret = -EINVAL;
1.1 root 216: goto fail;
1.1.1.7 root 217: }
1.1 root 218: s->l1_table_offset = header.l1_table_offset;
1.1.1.2 root 219: if (s->l1_size > 0) {
1.1.1.9 ! root 220: s->l1_table = g_malloc0(
1.1.1.2 root 221: align_offset(s->l1_size * sizeof(uint64_t), 512));
1.1.1.7 root 222: ret = bdrv_pread(bs->file, s->l1_table_offset, s->l1_table,
223: s->l1_size * sizeof(uint64_t));
224: if (ret < 0) {
1.1.1.2 root 225: goto fail;
1.1.1.7 root 226: }
1.1.1.2 root 227: for(i = 0;i < s->l1_size; i++) {
228: be64_to_cpus(&s->l1_table[i]);
229: }
1.1 root 230: }
1.1.1.7 root 231:
232: /* alloc L2 table/refcount block cache */
1.1.1.8 root 233: writethrough = ((flags & BDRV_O_CACHE_WB) == 0);
1.1.1.7 root 234: s->l2_table_cache = qcow2_cache_create(bs, L2_CACHE_SIZE, writethrough);
235: s->refcount_block_cache = qcow2_cache_create(bs, REFCOUNT_CACHE_SIZE,
236: writethrough);
237:
1.1.1.9 ! root 238: s->cluster_cache = g_malloc(s->cluster_size);
1.1 root 239: /* one more sector for decompressed data alignment */
1.1.1.9 ! root 240: s->cluster_data = qemu_blockalign(bs, QCOW_MAX_CRYPT_CLUSTERS * s->cluster_size
1.1 root 241: + 512);
242: s->cluster_cache_offset = -1;
1.1.1.9 ! root 243: s->flags = flags;
1.1 root 244:
1.1.1.7 root 245: ret = qcow2_refcount_init(bs);
246: if (ret != 0) {
1.1 root 247: goto fail;
1.1.1.7 root 248: }
1.1 root 249:
1.1.1.2 root 250: QLIST_INIT(&s->cluster_allocs);
1.1 root 251:
252: /* read qcow2 extensions */
1.1.1.7 root 253: if (header.backing_file_offset) {
1.1 root 254: ext_end = header.backing_file_offset;
1.1.1.7 root 255: } else {
1.1 root 256: ext_end = s->cluster_size;
1.1.1.7 root 257: }
258: if (qcow2_read_extensions(bs, sizeof(header), ext_end)) {
259: ret = -EINVAL;
1.1 root 260: goto fail;
1.1.1.7 root 261: }
1.1 root 262:
263: /* read the backing file name */
264: if (header.backing_file_offset != 0) {
265: len = header.backing_file_size;
1.1.1.7 root 266: if (len > 1023) {
1.1 root 267: len = 1023;
1.1.1.7 root 268: }
269: ret = bdrv_pread(bs->file, header.backing_file_offset,
270: bs->backing_file, len);
271: if (ret < 0) {
1.1 root 272: goto fail;
1.1.1.7 root 273: }
1.1 root 274: bs->backing_file[len] = '\0';
275: }
1.1.1.7 root 276: if (qcow2_read_snapshots(bs) < 0) {
277: ret = -EINVAL;
1.1 root 278: goto fail;
1.1.1.7 root 279: }
1.1 root 280:
1.1.1.9 ! root 281: /* Initialise locks */
! 282: qemu_co_mutex_init(&s->lock);
! 283:
1.1 root 284: #ifdef DEBUG_ALLOC
1.1.1.9 ! root 285: {
! 286: BdrvCheckResult result = {0};
! 287: qcow2_check_refcounts(bs, &result);
! 288: }
1.1 root 289: #endif
1.1.1.7 root 290: return ret;
1.1 root 291:
292: fail:
293: qcow2_free_snapshots(bs);
294: qcow2_refcount_close(bs);
1.1.1.9 ! root 295: g_free(s->l1_table);
1.1.1.7 root 296: if (s->l2_table_cache) {
297: qcow2_cache_destroy(bs, s->l2_table_cache);
298: }
1.1.1.9 ! root 299: g_free(s->cluster_cache);
! 300: qemu_vfree(s->cluster_data);
1.1.1.7 root 301: return ret;
1.1 root 302: }
303:
1.1.1.7 root 304: static int qcow2_set_key(BlockDriverState *bs, const char *key)
1.1 root 305: {
306: BDRVQcowState *s = bs->opaque;
307: uint8_t keybuf[16];
308: int len, i;
309:
310: memset(keybuf, 0, 16);
311: len = strlen(key);
312: if (len > 16)
313: len = 16;
314: /* XXX: we could compress the chars to 7 bits to increase
315: entropy */
316: for(i = 0;i < len;i++) {
317: keybuf[i] = key[i];
318: }
319: s->crypt_method = s->crypt_method_header;
320:
321: if (AES_set_encrypt_key(keybuf, 128, &s->aes_encrypt_key) != 0)
322: return -1;
323: if (AES_set_decrypt_key(keybuf, 128, &s->aes_decrypt_key) != 0)
324: return -1;
325: #if 0
326: /* test */
327: {
328: uint8_t in[16];
329: uint8_t out[16];
330: uint8_t tmp[16];
331: for(i=0;i<16;i++)
332: in[i] = i;
333: AES_encrypt(in, tmp, &s->aes_encrypt_key);
334: AES_decrypt(tmp, out, &s->aes_decrypt_key);
335: for(i = 0; i < 16; i++)
336: printf(" %02x", tmp[i]);
337: printf("\n");
338: for(i = 0; i < 16; i++)
339: printf(" %02x", out[i]);
340: printf("\n");
341: }
342: #endif
343: return 0;
344: }
345:
1.1.1.7 root 346: static int qcow2_is_allocated(BlockDriverState *bs, int64_t sector_num,
347: int nb_sectors, int *pnum)
1.1 root 348: {
349: uint64_t cluster_offset;
1.1.1.6 root 350: int ret;
1.1 root 351:
352: *pnum = nb_sectors;
1.1.1.6 root 353: /* FIXME We can get errors here, but the bdrv_is_allocated interface can't
354: * pass them on today */
355: ret = qcow2_get_cluster_offset(bs, sector_num << 9, pnum, &cluster_offset);
356: if (ret < 0) {
357: *pnum = 0;
358: }
1.1 root 359:
360: return (cluster_offset != 0);
361: }
362:
363: /* handle reading after the end of the backing file */
1.1.1.7 root 364: int qcow2_backing_read1(BlockDriverState *bs, QEMUIOVector *qiov,
365: int64_t sector_num, int nb_sectors)
1.1 root 366: {
367: int n1;
368: if ((sector_num + nb_sectors) <= bs->total_sectors)
369: return nb_sectors;
370: if (sector_num >= bs->total_sectors)
371: n1 = 0;
372: else
373: n1 = bs->total_sectors - sector_num;
1.1.1.7 root 374:
375: qemu_iovec_memset_skip(qiov, 0, 512 * (nb_sectors - n1), 512 * n1);
376:
1.1 root 377: return n1;
378: }
379:
1.1.1.9 ! root 380: static int qcow2_co_readv(BlockDriverState *bs, int64_t sector_num,
! 381: int remaining_sectors, QEMUIOVector *qiov)
1.1 root 382: {
383: BDRVQcowState *s = bs->opaque;
384: int index_in_cluster, n1;
1.1.1.9 ! root 385: int ret;
! 386: int cur_nr_sectors; /* number of sectors in current iteration */
! 387: uint64_t cluster_offset = 0;
! 388: uint64_t bytes_done = 0;
! 389: QEMUIOVector hd_qiov;
! 390: uint8_t *cluster_data = NULL;
1.1 root 391:
1.1.1.9 ! root 392: qemu_iovec_init(&hd_qiov, qiov->niov);
1.1 root 393:
1.1.1.9 ! root 394: qemu_co_mutex_lock(&s->lock);
1.1 root 395:
1.1.1.9 ! root 396: while (remaining_sectors != 0) {
1.1 root 397:
1.1.1.9 ! root 398: /* prepare next request */
! 399: cur_nr_sectors = remaining_sectors;
! 400: if (s->crypt_method) {
! 401: cur_nr_sectors = MIN(cur_nr_sectors,
! 402: QCOW_MAX_CRYPT_CLUSTERS * s->cluster_sectors);
! 403: }
1.1.1.7 root 404:
1.1.1.9 ! root 405: ret = qcow2_get_cluster_offset(bs, sector_num << 9,
! 406: &cur_nr_sectors, &cluster_offset);
! 407: if (ret < 0) {
! 408: goto fail;
! 409: }
1.1.1.6 root 410:
1.1.1.9 ! root 411: index_in_cluster = sector_num & (s->cluster_sectors - 1);
1.1 root 412:
1.1.1.9 ! root 413: qemu_iovec_reset(&hd_qiov);
! 414: qemu_iovec_copy(&hd_qiov, qiov, bytes_done,
! 415: cur_nr_sectors * 512);
! 416:
! 417: if (!cluster_offset) {
! 418:
! 419: if (bs->backing_hd) {
! 420: /* read from the base image */
! 421: n1 = qcow2_backing_read1(bs->backing_hd, &hd_qiov,
! 422: sector_num, cur_nr_sectors);
! 423: if (n1 > 0) {
! 424: BLKDBG_EVENT(bs->file, BLKDBG_READ_BACKING_AIO);
! 425: qemu_co_mutex_unlock(&s->lock);
! 426: ret = bdrv_co_readv(bs->backing_hd, sector_num,
! 427: n1, &hd_qiov);
! 428: qemu_co_mutex_lock(&s->lock);
! 429: if (ret < 0) {
! 430: goto fail;
! 431: }
1.1.1.7 root 432: }
1.1 root 433: } else {
1.1.1.9 ! root 434: /* Note: in this case, no need to wait */
! 435: qemu_iovec_memset(&hd_qiov, 0, 512 * cur_nr_sectors);
! 436: }
! 437: } else if (cluster_offset & QCOW_OFLAG_COMPRESSED) {
! 438: /* add AIO support for compressed blocks ? */
! 439: ret = qcow2_decompress_cluster(bs, cluster_offset);
! 440: if (ret < 0) {
! 441: goto fail;
1.1 root 442: }
1.1.1.7 root 443:
1.1.1.9 ! root 444: qemu_iovec_from_buffer(&hd_qiov,
! 445: s->cluster_cache + index_in_cluster * 512,
! 446: 512 * cur_nr_sectors);
! 447: } else {
! 448: if ((cluster_offset & 511) != 0) {
! 449: ret = -EIO;
! 450: goto fail;
! 451: }
1.1.1.7 root 452:
1.1.1.9 ! root 453: if (s->crypt_method) {
! 454: /*
! 455: * For encrypted images, read everything into a temporary
! 456: * contiguous buffer on which the AES functions can work.
! 457: */
! 458: if (!cluster_data) {
! 459: cluster_data =
! 460: qemu_blockalign(bs, QCOW_MAX_CRYPT_CLUSTERS * s->cluster_size);
! 461: }
1.1 root 462:
1.1.1.9 ! root 463: assert(cur_nr_sectors <=
! 464: QCOW_MAX_CRYPT_CLUSTERS * s->cluster_sectors);
! 465: qemu_iovec_reset(&hd_qiov);
! 466: qemu_iovec_add(&hd_qiov, cluster_data,
! 467: 512 * cur_nr_sectors);
1.1.1.7 root 468: }
469:
1.1.1.9 ! root 470: BLKDBG_EVENT(bs->file, BLKDBG_READ_AIO);
! 471: qemu_co_mutex_unlock(&s->lock);
! 472: ret = bdrv_co_readv(bs->file,
! 473: (cluster_offset >> 9) + index_in_cluster,
! 474: cur_nr_sectors, &hd_qiov);
! 475: qemu_co_mutex_lock(&s->lock);
! 476: if (ret < 0) {
! 477: goto fail;
! 478: }
! 479: if (s->crypt_method) {
! 480: qcow2_encrypt_sectors(s, sector_num, cluster_data,
! 481: cluster_data, cur_nr_sectors, 0, &s->aes_decrypt_key);
! 482: qemu_iovec_reset(&hd_qiov);
! 483: qemu_iovec_copy(&hd_qiov, qiov, bytes_done,
! 484: cur_nr_sectors * 512);
! 485: qemu_iovec_from_buffer(&hd_qiov, cluster_data,
! 486: 512 * cur_nr_sectors);
! 487: }
1.1.1.7 root 488: }
489:
1.1.1.9 ! root 490: remaining_sectors -= cur_nr_sectors;
! 491: sector_num += cur_nr_sectors;
! 492: bytes_done += cur_nr_sectors * 512;
1.1 root 493: }
1.1.1.9 ! root 494: ret = 0;
1.1 root 495:
1.1.1.9 ! root 496: fail:
! 497: qemu_co_mutex_unlock(&s->lock);
1.1 root 498:
1.1.1.9 ! root 499: qemu_iovec_destroy(&hd_qiov);
! 500: qemu_vfree(cluster_data);
1.1.1.8 root 501:
1.1.1.9 ! root 502: return ret;
1.1 root 503: }
504:
1.1.1.9 ! root 505: static void run_dependent_requests(BDRVQcowState *s, QCowL2Meta *m)
1.1 root 506: {
507: /* Take the request off the list of running requests */
508: if (m->nb_clusters != 0) {
1.1.1.2 root 509: QLIST_REMOVE(m, next_in_flight);
1.1 root 510: }
511:
1.1.1.6 root 512: /* Restart all dependent requests */
1.1.1.9 ! root 513: if (!qemu_co_queue_empty(&m->dependent_requests)) {
! 514: qemu_co_mutex_unlock(&s->lock);
! 515: while(qemu_co_queue_next(&m->dependent_requests));
! 516: qemu_co_mutex_lock(&s->lock);
1.1 root 517: }
518: }
519:
1.1.1.9 ! root 520: static int qcow2_co_writev(BlockDriverState *bs,
! 521: int64_t sector_num,
! 522: int remaining_sectors,
! 523: QEMUIOVector *qiov)
1.1 root 524: {
525: BDRVQcowState *s = bs->opaque;
526: int index_in_cluster;
527: int n_end;
1.1.1.9 ! root 528: int ret;
! 529: int cur_nr_sectors; /* number of sectors in current iteration */
! 530: uint64_t cluster_offset;
! 531: QEMUIOVector hd_qiov;
! 532: uint64_t bytes_done = 0;
! 533: uint8_t *cluster_data = NULL;
! 534: QCowL2Meta l2meta = {
! 535: .nb_clusters = 0,
! 536: };
1.1 root 537:
1.1.1.9 ! root 538: qemu_co_queue_init(&l2meta.dependent_requests);
1.1 root 539:
1.1.1.9 ! root 540: qemu_iovec_init(&hd_qiov, qiov->niov);
1.1 root 541:
1.1.1.9 ! root 542: s->cluster_cache_offset = -1; /* disable compressed cache */
1.1 root 543:
1.1.1.9 ! root 544: qemu_co_mutex_lock(&s->lock);
1.1 root 545:
1.1.1.9 ! root 546: while (remaining_sectors != 0) {
1.1 root 547:
1.1.1.9 ! root 548: index_in_cluster = sector_num & (s->cluster_sectors - 1);
! 549: n_end = index_in_cluster + remaining_sectors;
! 550: if (s->crypt_method &&
! 551: n_end > QCOW_MAX_CRYPT_CLUSTERS * s->cluster_sectors) {
! 552: n_end = QCOW_MAX_CRYPT_CLUSTERS * s->cluster_sectors;
! 553: }
1.1.1.3 root 554:
1.1.1.9 ! root 555: ret = qcow2_alloc_cluster_offset(bs, sector_num << 9,
! 556: index_in_cluster, n_end, &cur_nr_sectors, &l2meta);
! 557: if (ret < 0) {
! 558: goto fail;
! 559: }
1.1 root 560:
1.1.1.9 ! root 561: cluster_offset = l2meta.cluster_offset;
! 562: assert((cluster_offset & 511) == 0);
1.1 root 563:
1.1.1.9 ! root 564: qemu_iovec_reset(&hd_qiov);
! 565: qemu_iovec_copy(&hd_qiov, qiov, bytes_done,
! 566: cur_nr_sectors * 512);
1.1.1.3 root 567:
1.1.1.9 ! root 568: if (s->crypt_method) {
! 569: if (!cluster_data) {
! 570: cluster_data = qemu_blockalign(bs, QCOW_MAX_CRYPT_CLUSTERS *
! 571: s->cluster_size);
! 572: }
1.1.1.7 root 573:
1.1.1.9 ! root 574: assert(hd_qiov.size <=
! 575: QCOW_MAX_CRYPT_CLUSTERS * s->cluster_size);
! 576: qemu_iovec_to_buffer(&hd_qiov, cluster_data);
! 577:
! 578: qcow2_encrypt_sectors(s, sector_num, cluster_data,
! 579: cluster_data, cur_nr_sectors, 1, &s->aes_encrypt_key);
! 580:
! 581: qemu_iovec_reset(&hd_qiov);
! 582: qemu_iovec_add(&hd_qiov, cluster_data,
! 583: cur_nr_sectors * 512);
! 584: }
! 585:
! 586: BLKDBG_EVENT(bs->file, BLKDBG_WRITE_AIO);
! 587: qemu_co_mutex_unlock(&s->lock);
! 588: ret = bdrv_co_writev(bs->file,
! 589: (cluster_offset >> 9) + index_in_cluster,
! 590: cur_nr_sectors, &hd_qiov);
! 591: qemu_co_mutex_lock(&s->lock);
! 592: if (ret < 0) {
! 593: goto fail;
1.1 root 594: }
1.1.1.7 root 595:
1.1.1.9 ! root 596: ret = qcow2_alloc_cluster_link_l2(bs, &l2meta);
! 597: if (ret < 0) {
! 598: goto fail;
! 599: }
1.1.1.7 root 600:
1.1.1.9 ! root 601: run_dependent_requests(s, &l2meta);
1.1.1.7 root 602:
1.1.1.9 ! root 603: remaining_sectors -= cur_nr_sectors;
! 604: sector_num += cur_nr_sectors;
! 605: bytes_done += cur_nr_sectors * 512;
1.1.1.4 root 606: }
1.1.1.9 ! root 607: ret = 0;
1.1 root 608:
1.1.1.4 root 609: fail:
1.1.1.9 ! root 610: run_dependent_requests(s, &l2meta);
1.1 root 611:
1.1.1.9 ! root 612: qemu_co_mutex_unlock(&s->lock);
1.1 root 613:
1.1.1.9 ! root 614: qemu_iovec_destroy(&hd_qiov);
! 615: qemu_vfree(cluster_data);
1.1.1.8 root 616:
1.1.1.9 ! root 617: return ret;
1.1 root 618: }
619:
1.1.1.7 root 620: static void qcow2_close(BlockDriverState *bs)
1.1 root 621: {
622: BDRVQcowState *s = bs->opaque;
1.1.1.9 ! root 623: g_free(s->l1_table);
1.1.1.7 root 624:
625: qcow2_cache_flush(bs, s->l2_table_cache);
626: qcow2_cache_flush(bs, s->refcount_block_cache);
627:
628: qcow2_cache_destroy(bs, s->l2_table_cache);
629: qcow2_cache_destroy(bs, s->refcount_block_cache);
630:
1.1.1.9 ! root 631: g_free(s->cluster_cache);
! 632: qemu_vfree(s->cluster_data);
1.1 root 633: qcow2_refcount_close(bs);
1.1.1.6 root 634: }
635:
1.1.1.9 ! root 636: static void qcow2_invalidate_cache(BlockDriverState *bs)
! 637: {
! 638: BDRVQcowState *s = bs->opaque;
! 639: int flags = s->flags;
! 640: AES_KEY aes_encrypt_key;
! 641: AES_KEY aes_decrypt_key;
! 642: uint32_t crypt_method = 0;
! 643:
! 644: /*
! 645: * Backing files are read-only which makes all of their metadata immutable,
! 646: * that means we don't have to worry about reopening them here.
! 647: */
! 648:
! 649: if (s->crypt_method) {
! 650: crypt_method = s->crypt_method;
! 651: memcpy(&aes_encrypt_key, &s->aes_encrypt_key, sizeof(aes_encrypt_key));
! 652: memcpy(&aes_decrypt_key, &s->aes_decrypt_key, sizeof(aes_decrypt_key));
! 653: }
! 654:
! 655: qcow2_close(bs);
! 656:
! 657: memset(s, 0, sizeof(BDRVQcowState));
! 658: qcow2_open(bs, flags);
! 659:
! 660: if (crypt_method) {
! 661: s->crypt_method = crypt_method;
! 662: memcpy(&s->aes_encrypt_key, &aes_encrypt_key, sizeof(aes_encrypt_key));
! 663: memcpy(&s->aes_decrypt_key, &aes_decrypt_key, sizeof(aes_decrypt_key));
! 664: }
! 665: }
! 666:
1.1.1.6 root 667: /*
668: * Updates the variable length parts of the qcow2 header, i.e. the backing file
669: * name and all extensions. qcow2 was not designed to allow such changes, so if
670: * we run out of space (we can only use the first cluster) this function may
671: * fail.
672: *
673: * Returns 0 on success, -errno in error cases.
674: */
675: static int qcow2_update_ext_header(BlockDriverState *bs,
676: const char *backing_file, const char *backing_fmt)
677: {
678: size_t backing_file_len = 0;
679: size_t backing_fmt_len = 0;
680: BDRVQcowState *s = bs->opaque;
681: QCowExtension ext_backing_fmt = {0, 0};
682: int ret;
683:
684: /* Backing file format doesn't make sense without a backing file */
685: if (backing_fmt && !backing_file) {
686: return -EINVAL;
687: }
688:
689: /* Prepare the backing file format extension if needed */
690: if (backing_fmt) {
691: ext_backing_fmt.len = cpu_to_be32(strlen(backing_fmt));
1.1.1.7 root 692: ext_backing_fmt.magic = cpu_to_be32(QCOW2_EXT_MAGIC_BACKING_FORMAT);
1.1.1.6 root 693: backing_fmt_len = ((sizeof(ext_backing_fmt)
694: + strlen(backing_fmt) + 7) & ~7);
695: }
696:
697: /* Check if we can fit the new header into the first cluster */
698: if (backing_file) {
699: backing_file_len = strlen(backing_file);
700: }
701:
702: size_t header_size = sizeof(QCowHeader) + backing_file_len
703: + backing_fmt_len;
704:
705: if (header_size > s->cluster_size) {
706: return -ENOSPC;
707: }
708:
709: /* Rewrite backing file name and qcow2 extensions */
710: size_t ext_size = header_size - sizeof(QCowHeader);
711: uint8_t buf[ext_size];
712: size_t offset = 0;
713: size_t backing_file_offset = 0;
714:
715: if (backing_file) {
716: if (backing_fmt) {
717: int padding = backing_fmt_len -
718: (sizeof(ext_backing_fmt) + strlen(backing_fmt));
719:
720: memcpy(buf + offset, &ext_backing_fmt, sizeof(ext_backing_fmt));
721: offset += sizeof(ext_backing_fmt);
722:
723: memcpy(buf + offset, backing_fmt, strlen(backing_fmt));
724: offset += strlen(backing_fmt);
725:
726: memset(buf + offset, 0, padding);
727: offset += padding;
728: }
729:
730: memcpy(buf + offset, backing_file, backing_file_len);
731: backing_file_offset = sizeof(QCowHeader) + offset;
732: }
733:
734: ret = bdrv_pwrite_sync(bs->file, sizeof(QCowHeader), buf, ext_size);
735: if (ret < 0) {
736: goto fail;
737: }
738:
739: /* Update header fields */
740: uint64_t be_backing_file_offset = cpu_to_be64(backing_file_offset);
741: uint32_t be_backing_file_size = cpu_to_be32(backing_file_len);
742:
743: ret = bdrv_pwrite_sync(bs->file, offsetof(QCowHeader, backing_file_offset),
744: &be_backing_file_offset, sizeof(uint64_t));
745: if (ret < 0) {
746: goto fail;
747: }
748:
749: ret = bdrv_pwrite_sync(bs->file, offsetof(QCowHeader, backing_file_size),
750: &be_backing_file_size, sizeof(uint32_t));
751: if (ret < 0) {
752: goto fail;
753: }
754:
755: ret = 0;
756: fail:
757: return ret;
758: }
759:
760: static int qcow2_change_backing_file(BlockDriverState *bs,
761: const char *backing_file, const char *backing_fmt)
762: {
763: return qcow2_update_ext_header(bs, backing_file, backing_fmt);
1.1 root 764: }
765:
1.1.1.2 root 766: static int preallocate(BlockDriverState *bs)
767: {
768: uint64_t nb_sectors;
769: uint64_t offset;
770: int num;
1.1.1.3 root 771: int ret;
1.1.1.2 root 772: QCowL2Meta meta;
773:
774: nb_sectors = bdrv_getlength(bs) >> 9;
775: offset = 0;
1.1.1.9 ! root 776: qemu_co_queue_init(&meta.dependent_requests);
1.1.1.3 root 777: meta.cluster_offset = 0;
1.1.1.2 root 778:
779: while (nb_sectors) {
780: num = MIN(nb_sectors, INT_MAX >> 9);
1.1.1.3 root 781: ret = qcow2_alloc_cluster_offset(bs, offset, 0, num, &num, &meta);
782: if (ret < 0) {
1.1.1.6 root 783: return ret;
1.1.1.2 root 784: }
785:
1.1.1.6 root 786: ret = qcow2_alloc_cluster_link_l2(bs, &meta);
787: if (ret < 0) {
1.1.1.3 root 788: qcow2_free_any_clusters(bs, meta.cluster_offset, meta.nb_clusters);
1.1.1.6 root 789: return ret;
1.1.1.2 root 790: }
791:
792: /* There are no dependent requests, but we need to remove our request
793: * from the list of in-flight requests */
1.1.1.9 ! root 794: run_dependent_requests(bs->opaque, &meta);
1.1.1.2 root 795:
796: /* TODO Preallocate data if requested */
797:
798: nb_sectors -= num;
799: offset += num << 9;
800: }
801:
802: /*
803: * It is expected that the image file is large enough to actually contain
804: * all of the allocated clusters (otherwise we get failing reads after
805: * EOF). Extend the image to the last allocated sector.
806: */
1.1.1.3 root 807: if (meta.cluster_offset != 0) {
1.1.1.2 root 808: uint8_t buf[512];
809: memset(buf, 0, 512);
1.1.1.6 root 810: ret = bdrv_write(bs->file, (meta.cluster_offset >> 9) + num - 1, buf, 1);
811: if (ret < 0) {
812: return ret;
813: }
1.1.1.2 root 814: }
815:
816: return 0;
817: }
818:
1.1.1.7 root 819: static int qcow2_create2(const char *filename, int64_t total_size,
820: const char *backing_file, const char *backing_format,
821: int flags, size_t cluster_size, int prealloc,
822: QEMUOptionParameter *options)
823: {
824: /* Calulate cluster_bits */
825: int cluster_bits;
826: cluster_bits = ffs(cluster_size) - 1;
827: if (cluster_bits < MIN_CLUSTER_BITS || cluster_bits > MAX_CLUSTER_BITS ||
828: (1 << cluster_bits) != cluster_size)
829: {
830: error_report(
1.1.1.8 root 831: "Cluster size must be a power of two between %d and %dk",
1.1.1.7 root 832: 1 << MIN_CLUSTER_BITS, 1 << (MAX_CLUSTER_BITS - 10));
833: return -EINVAL;
834: }
1.1 root 835:
1.1.1.7 root 836: /*
837: * Open the image file and write a minimal qcow2 header.
838: *
839: * We keep things simple and start with a zero-sized image. We also
840: * do without refcount blocks or a L1 table for now. We'll fix the
841: * inconsistency later.
842: *
843: * We do need a refcount table because growing the refcount table means
844: * allocating two new refcount blocks - the seconds of which would be at
845: * 2 GB for 64k clusters, and we don't want to have a 2 GB initial file
846: * size for any qcow2 image.
847: */
848: BlockDriverState* bs;
1.1 root 849: QCowHeader header;
1.1.1.7 root 850: uint8_t* refcount_table;
1.1.1.6 root 851: int ret;
1.1 root 852:
1.1.1.7 root 853: ret = bdrv_create_file(filename, options);
854: if (ret < 0) {
855: return ret;
856: }
857:
858: ret = bdrv_file_open(&bs, filename, BDRV_O_RDWR);
859: if (ret < 0) {
860: return ret;
861: }
1.1 root 862:
1.1.1.7 root 863: /* Write the header */
1.1 root 864: memset(&header, 0, sizeof(header));
865: header.magic = cpu_to_be32(QCOW_MAGIC);
866: header.version = cpu_to_be32(QCOW_VERSION);
1.1.1.7 root 867: header.cluster_bits = cpu_to_be32(cluster_bits);
868: header.size = cpu_to_be64(0);
869: header.l1_table_offset = cpu_to_be64(0);
870: header.l1_size = cpu_to_be32(0);
871: header.refcount_table_offset = cpu_to_be64(cluster_size);
872: header.refcount_table_clusters = cpu_to_be32(1);
1.1 root 873:
874: if (flags & BLOCK_FLAG_ENCRYPT) {
875: header.crypt_method = cpu_to_be32(QCOW_CRYPT_AES);
876: } else {
877: header.crypt_method = cpu_to_be32(QCOW_CRYPT_NONE);
878: }
1.1.1.7 root 879:
880: ret = bdrv_pwrite(bs, 0, &header, sizeof(header));
881: if (ret < 0) {
882: goto out;
883: }
884:
885: /* Write an empty refcount table */
1.1.1.9 ! root 886: refcount_table = g_malloc0(cluster_size);
1.1.1.7 root 887: ret = bdrv_pwrite(bs, cluster_size, refcount_table, cluster_size);
1.1.1.9 ! root 888: g_free(refcount_table);
1.1.1.7 root 889:
890: if (ret < 0) {
891: goto out;
892: }
893:
894: bdrv_close(bs);
895:
896: /*
897: * And now open the image and make it consistent first (i.e. increase the
898: * refcount of the cluster that is occupied by the header and the refcount
899: * table)
900: */
901: BlockDriver* drv = bdrv_find_format("qcow2");
902: assert(drv != NULL);
903: ret = bdrv_open(bs, filename,
904: BDRV_O_RDWR | BDRV_O_CACHE_WB | BDRV_O_NO_FLUSH, drv);
905: if (ret < 0) {
906: goto out;
907: }
908:
909: ret = qcow2_alloc_clusters(bs, 2 * cluster_size);
910: if (ret < 0) {
911: goto out;
912:
913: } else if (ret != 0) {
914: error_report("Huh, first cluster in empty image is already in use?");
915: abort();
916: }
917:
918: /* Okay, now that we have a valid image, let's give it the right size */
919: ret = bdrv_truncate(bs, total_size * BDRV_SECTOR_SIZE);
920: if (ret < 0) {
921: goto out;
1.1.1.6 root 922: }
1.1.1.7 root 923:
924: /* Want a backing file? There you go.*/
1.1 root 925: if (backing_file) {
1.1.1.7 root 926: ret = bdrv_change_backing_file(bs, backing_file, backing_format);
927: if (ret < 0) {
928: goto out;
1.1 root 929: }
1.1.1.6 root 930: }
1.1 root 931:
1.1.1.7 root 932: /* And if we're supposed to preallocate metadata, do that now */
933: if (prealloc) {
1.1.1.6 root 934: ret = preallocate(bs);
1.1.1.7 root 935: if (ret < 0) {
936: goto out;
937: }
1.1.1.2 root 938: }
939:
1.1.1.7 root 940: ret = 0;
941: out:
942: bdrv_delete(bs);
1.1.1.6 root 943: return ret;
1.1 root 944: }
945:
1.1.1.7 root 946: static int qcow2_create(const char *filename, QEMUOptionParameter *options)
1.1 root 947: {
948: const char *backing_file = NULL;
949: const char *backing_fmt = NULL;
950: uint64_t sectors = 0;
951: int flags = 0;
1.1.1.8 root 952: size_t cluster_size = DEFAULT_CLUSTER_SIZE;
1.1.1.2 root 953: int prealloc = 0;
1.1 root 954:
955: /* Read out options */
956: while (options && options->name) {
957: if (!strcmp(options->name, BLOCK_OPT_SIZE)) {
958: sectors = options->value.n / 512;
959: } else if (!strcmp(options->name, BLOCK_OPT_BACKING_FILE)) {
960: backing_file = options->value.s;
961: } else if (!strcmp(options->name, BLOCK_OPT_BACKING_FMT)) {
962: backing_fmt = options->value.s;
963: } else if (!strcmp(options->name, BLOCK_OPT_ENCRYPT)) {
964: flags |= options->value.n ? BLOCK_FLAG_ENCRYPT : 0;
965: } else if (!strcmp(options->name, BLOCK_OPT_CLUSTER_SIZE)) {
966: if (options->value.n) {
967: cluster_size = options->value.n;
968: }
1.1.1.2 root 969: } else if (!strcmp(options->name, BLOCK_OPT_PREALLOC)) {
970: if (!options->value.s || !strcmp(options->value.s, "off")) {
971: prealloc = 0;
972: } else if (!strcmp(options->value.s, "metadata")) {
973: prealloc = 1;
974: } else {
975: fprintf(stderr, "Invalid preallocation mode: '%s'\n",
976: options->value.s);
977: return -EINVAL;
978: }
1.1 root 979: }
980: options++;
981: }
982:
1.1.1.2 root 983: if (backing_file && prealloc) {
984: fprintf(stderr, "Backing file and preallocation cannot be used at "
985: "the same time\n");
986: return -EINVAL;
987: }
988:
1.1.1.7 root 989: return qcow2_create2(filename, sectors, backing_file, backing_fmt, flags,
990: cluster_size, prealloc, options);
1.1 root 991: }
992:
1.1.1.7 root 993: static int qcow2_make_empty(BlockDriverState *bs)
1.1 root 994: {
995: #if 0
996: /* XXX: not correct */
997: BDRVQcowState *s = bs->opaque;
998: uint32_t l1_length = s->l1_size * sizeof(uint64_t);
999: int ret;
1000:
1001: memset(s->l1_table, 0, l1_length);
1.1.1.6 root 1002: if (bdrv_pwrite(bs->file, s->l1_table_offset, s->l1_table, l1_length) < 0)
1.1 root 1003: return -1;
1.1.1.6 root 1004: ret = bdrv_truncate(bs->file, s->l1_table_offset + l1_length);
1.1 root 1005: if (ret < 0)
1006: return ret;
1007:
1008: l2_cache_reset(bs);
1009: #endif
1010: return 0;
1011: }
1012:
1.1.1.9 ! root 1013: static coroutine_fn int qcow2_co_discard(BlockDriverState *bs,
! 1014: int64_t sector_num, int nb_sectors)
1.1.1.7 root 1015: {
1.1.1.9 ! root 1016: int ret;
! 1017: BDRVQcowState *s = bs->opaque;
! 1018:
! 1019: qemu_co_mutex_lock(&s->lock);
! 1020: ret = qcow2_discard_clusters(bs, sector_num << BDRV_SECTOR_BITS,
1.1.1.7 root 1021: nb_sectors);
1.1.1.9 ! root 1022: qemu_co_mutex_unlock(&s->lock);
! 1023: return ret;
1.1.1.7 root 1024: }
1025:
1.1.1.6 root 1026: static int qcow2_truncate(BlockDriverState *bs, int64_t offset)
1027: {
1028: BDRVQcowState *s = bs->opaque;
1029: int ret, new_l1_size;
1030:
1031: if (offset & 511) {
1032: return -EINVAL;
1033: }
1034:
1035: /* cannot proceed if image has snapshots */
1036: if (s->nb_snapshots) {
1037: return -ENOTSUP;
1038: }
1039:
1040: /* shrinking is currently not supported */
1041: if (offset < bs->total_sectors * 512) {
1042: return -ENOTSUP;
1043: }
1044:
1045: new_l1_size = size_to_l1(s, offset);
1.1.1.7 root 1046: ret = qcow2_grow_l1_table(bs, new_l1_size, true);
1.1.1.6 root 1047: if (ret < 0) {
1048: return ret;
1049: }
1050:
1051: /* write updated header.size */
1052: offset = cpu_to_be64(offset);
1053: ret = bdrv_pwrite_sync(bs->file, offsetof(QCowHeader, size),
1054: &offset, sizeof(uint64_t));
1055: if (ret < 0) {
1056: return ret;
1057: }
1058:
1059: s->l1_vm_state_index = new_l1_size;
1060: return 0;
1061: }
1062:
1.1 root 1063: /* XXX: put compressed sectors first, then all the cluster aligned
1064: tables to avoid losing bytes in alignment */
1.1.1.7 root 1065: static int qcow2_write_compressed(BlockDriverState *bs, int64_t sector_num,
1066: const uint8_t *buf, int nb_sectors)
1.1 root 1067: {
1068: BDRVQcowState *s = bs->opaque;
1069: z_stream strm;
1070: int ret, out_len;
1071: uint8_t *out_buf;
1072: uint64_t cluster_offset;
1073:
1074: if (nb_sectors == 0) {
1075: /* align end of file to a sector boundary to ease reading with
1076: sector based I/Os */
1.1.1.6 root 1077: cluster_offset = bdrv_getlength(bs->file);
1.1 root 1078: cluster_offset = (cluster_offset + 511) & ~511;
1.1.1.6 root 1079: bdrv_truncate(bs->file, cluster_offset);
1.1 root 1080: return 0;
1081: }
1082:
1083: if (nb_sectors != s->cluster_sectors)
1084: return -EINVAL;
1085:
1.1.1.9 ! root 1086: out_buf = g_malloc(s->cluster_size + (s->cluster_size / 1000) + 128);
1.1 root 1087:
1088: /* best compression, small window, no zlib header */
1089: memset(&strm, 0, sizeof(strm));
1090: ret = deflateInit2(&strm, Z_DEFAULT_COMPRESSION,
1091: Z_DEFLATED, -12,
1092: 9, Z_DEFAULT_STRATEGY);
1093: if (ret != 0) {
1.1.1.9 ! root 1094: ret = -EINVAL;
! 1095: goto fail;
1.1 root 1096: }
1097:
1098: strm.avail_in = s->cluster_size;
1099: strm.next_in = (uint8_t *)buf;
1100: strm.avail_out = s->cluster_size;
1101: strm.next_out = out_buf;
1102:
1103: ret = deflate(&strm, Z_FINISH);
1104: if (ret != Z_STREAM_END && ret != Z_OK) {
1105: deflateEnd(&strm);
1.1.1.9 ! root 1106: ret = -EINVAL;
! 1107: goto fail;
1.1 root 1108: }
1109: out_len = strm.next_out - out_buf;
1110:
1111: deflateEnd(&strm);
1112:
1113: if (ret != Z_STREAM_END || out_len >= s->cluster_size) {
1114: /* could not compress: write normal cluster */
1.1.1.9 ! root 1115: ret = bdrv_write(bs, sector_num, buf, s->cluster_sectors);
! 1116: if (ret < 0) {
! 1117: goto fail;
! 1118: }
1.1 root 1119: } else {
1120: cluster_offset = qcow2_alloc_compressed_cluster_offset(bs,
1121: sector_num << 9, out_len);
1.1.1.9 ! root 1122: if (!cluster_offset) {
! 1123: ret = -EIO;
! 1124: goto fail;
! 1125: }
1.1 root 1126: cluster_offset &= s->cluster_offset_mask;
1.1.1.6 root 1127: BLKDBG_EVENT(bs->file, BLKDBG_WRITE_COMPRESSED);
1.1.1.9 ! root 1128: ret = bdrv_pwrite(bs->file, cluster_offset, out_buf, out_len);
! 1129: if (ret < 0) {
! 1130: goto fail;
1.1 root 1131: }
1132: }
1133:
1.1.1.9 ! root 1134: ret = 0;
! 1135: fail:
! 1136: g_free(out_buf);
! 1137: return ret;
1.1 root 1138: }
1139:
1.1.1.9 ! root 1140: static int qcow2_co_flush_to_os(BlockDriverState *bs)
1.1 root 1141: {
1.1.1.7 root 1142: BDRVQcowState *s = bs->opaque;
1143: int ret;
1144:
1.1.1.9 ! root 1145: qemu_co_mutex_lock(&s->lock);
1.1.1.7 root 1146: ret = qcow2_cache_flush(bs, s->l2_table_cache);
1147: if (ret < 0) {
1.1.1.9 ! root 1148: qemu_co_mutex_unlock(&s->lock);
1.1.1.7 root 1149: return ret;
1150: }
1151:
1152: ret = qcow2_cache_flush(bs, s->refcount_block_cache);
1153: if (ret < 0) {
1.1.1.9 ! root 1154: qemu_co_mutex_unlock(&s->lock);
1.1.1.7 root 1155: return ret;
1156: }
1.1.1.9 ! root 1157: qemu_co_mutex_unlock(&s->lock);
1.1.1.7 root 1158:
1.1.1.9 ! root 1159: return 0;
1.1.1.6 root 1160: }
1161:
1.1.1.9 ! root 1162: static int qcow2_co_flush_to_disk(BlockDriverState *bs)
1.1.1.6 root 1163: {
1.1.1.9 ! root 1164: return bdrv_co_flush(bs->file);
1.1 root 1165: }
1166:
1.1.1.7 root 1167: static int64_t qcow2_vm_state_offset(BDRVQcowState *s)
1.1 root 1168: {
1169: return (int64_t)s->l1_vm_state_index << (s->cluster_bits + s->l2_bits);
1170: }
1171:
1.1.1.7 root 1172: static int qcow2_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
1.1 root 1173: {
1174: BDRVQcowState *s = bs->opaque;
1175: bdi->cluster_size = s->cluster_size;
1.1.1.7 root 1176: bdi->vm_state_offset = qcow2_vm_state_offset(s);
1.1 root 1177: return 0;
1178: }
1179:
1180:
1.1.1.7 root 1181: static int qcow2_check(BlockDriverState *bs, BdrvCheckResult *result)
1.1 root 1182: {
1.1.1.6 root 1183: return qcow2_check_refcounts(bs, result);
1.1 root 1184: }
1185:
1186: #if 0
1187: static void dump_refcounts(BlockDriverState *bs)
1188: {
1189: BDRVQcowState *s = bs->opaque;
1190: int64_t nb_clusters, k, k1, size;
1191: int refcount;
1192:
1.1.1.6 root 1193: size = bdrv_getlength(bs->file);
1.1 root 1194: nb_clusters = size_to_clusters(s, size);
1195: for(k = 0; k < nb_clusters;) {
1196: k1 = k;
1197: refcount = get_refcount(bs, k);
1198: k++;
1199: while (k < nb_clusters && get_refcount(bs, k) == refcount)
1200: k++;
1.1.1.6 root 1201: printf("%" PRId64 ": refcount=%d nb=%" PRId64 "\n", k, refcount,
1202: k - k1);
1.1 root 1203: }
1204: }
1205: #endif
1206:
1.1.1.7 root 1207: static int qcow2_save_vmstate(BlockDriverState *bs, const uint8_t *buf,
1208: int64_t pos, int size)
1.1 root 1209: {
1210: BDRVQcowState *s = bs->opaque;
1211: int growable = bs->growable;
1.1.1.3 root 1212: int ret;
1.1 root 1213:
1.1.1.6 root 1214: BLKDBG_EVENT(bs->file, BLKDBG_VMSTATE_SAVE);
1.1 root 1215: bs->growable = 1;
1.1.1.7 root 1216: ret = bdrv_pwrite(bs, qcow2_vm_state_offset(s) + pos, buf, size);
1.1 root 1217: bs->growable = growable;
1218:
1.1.1.3 root 1219: return ret;
1.1 root 1220: }
1221:
1.1.1.7 root 1222: static int qcow2_load_vmstate(BlockDriverState *bs, uint8_t *buf,
1223: int64_t pos, int size)
1.1 root 1224: {
1225: BDRVQcowState *s = bs->opaque;
1226: int growable = bs->growable;
1227: int ret;
1228:
1.1.1.6 root 1229: BLKDBG_EVENT(bs->file, BLKDBG_VMSTATE_LOAD);
1.1 root 1230: bs->growable = 1;
1.1.1.7 root 1231: ret = bdrv_pread(bs, qcow2_vm_state_offset(s) + pos, buf, size);
1.1 root 1232: bs->growable = growable;
1233:
1234: return ret;
1235: }
1236:
1.1.1.7 root 1237: static QEMUOptionParameter qcow2_create_options[] = {
1.1 root 1238: {
1239: .name = BLOCK_OPT_SIZE,
1240: .type = OPT_SIZE,
1241: .help = "Virtual disk size"
1242: },
1243: {
1244: .name = BLOCK_OPT_BACKING_FILE,
1245: .type = OPT_STRING,
1246: .help = "File name of a base image"
1247: },
1248: {
1249: .name = BLOCK_OPT_BACKING_FMT,
1250: .type = OPT_STRING,
1251: .help = "Image format of the base image"
1252: },
1253: {
1254: .name = BLOCK_OPT_ENCRYPT,
1255: .type = OPT_FLAG,
1256: .help = "Encrypt the image"
1257: },
1258: {
1259: .name = BLOCK_OPT_CLUSTER_SIZE,
1260: .type = OPT_SIZE,
1.1.1.8 root 1261: .help = "qcow2 cluster size",
1262: .value = { .n = DEFAULT_CLUSTER_SIZE },
1.1 root 1263: },
1.1.1.2 root 1264: {
1265: .name = BLOCK_OPT_PREALLOC,
1266: .type = OPT_STRING,
1267: .help = "Preallocation mode (allowed values: off, metadata)"
1268: },
1.1 root 1269: { NULL }
1270: };
1271:
1272: static BlockDriver bdrv_qcow2 = {
1.1.1.7 root 1273: .format_name = "qcow2",
1274: .instance_size = sizeof(BDRVQcowState),
1275: .bdrv_probe = qcow2_probe,
1276: .bdrv_open = qcow2_open,
1277: .bdrv_close = qcow2_close,
1278: .bdrv_create = qcow2_create,
1279: .bdrv_is_allocated = qcow2_is_allocated,
1280: .bdrv_set_key = qcow2_set_key,
1281: .bdrv_make_empty = qcow2_make_empty,
1282:
1.1.1.9 ! root 1283: .bdrv_co_readv = qcow2_co_readv,
! 1284: .bdrv_co_writev = qcow2_co_writev,
! 1285: .bdrv_co_flush_to_os = qcow2_co_flush_to_os,
! 1286: .bdrv_co_flush_to_disk = qcow2_co_flush_to_disk,
1.1.1.6 root 1287:
1.1.1.9 ! root 1288: .bdrv_co_discard = qcow2_co_discard,
1.1.1.6 root 1289: .bdrv_truncate = qcow2_truncate,
1.1.1.7 root 1290: .bdrv_write_compressed = qcow2_write_compressed,
1.1 root 1291:
1292: .bdrv_snapshot_create = qcow2_snapshot_create,
1293: .bdrv_snapshot_goto = qcow2_snapshot_goto,
1294: .bdrv_snapshot_delete = qcow2_snapshot_delete,
1295: .bdrv_snapshot_list = qcow2_snapshot_list,
1.1.1.7 root 1296: .bdrv_snapshot_load_tmp = qcow2_snapshot_load_tmp,
1297: .bdrv_get_info = qcow2_get_info,
1.1 root 1298:
1.1.1.7 root 1299: .bdrv_save_vmstate = qcow2_save_vmstate,
1300: .bdrv_load_vmstate = qcow2_load_vmstate,
1.1 root 1301:
1.1.1.6 root 1302: .bdrv_change_backing_file = qcow2_change_backing_file,
1303:
1.1.1.9 ! root 1304: .bdrv_invalidate_cache = qcow2_invalidate_cache,
! 1305:
1.1.1.7 root 1306: .create_options = qcow2_create_options,
1307: .bdrv_check = qcow2_check,
1.1 root 1308: };
1309:
1310: static void bdrv_qcow2_init(void)
1311: {
1312: bdrv_register(&bdrv_qcow2);
1313: }
1314:
1315: block_init(bdrv_qcow2_init);
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