1585f8587Sbellard /* 2585f8587Sbellard * Block driver for the QCOW version 2 format 3585f8587Sbellard * 4585f8587Sbellard * Copyright (c) 2004-2006 Fabrice Bellard 5585f8587Sbellard * 6585f8587Sbellard * Permission is hereby granted, free of charge, to any person obtaining a copy 7585f8587Sbellard * of this software and associated documentation files (the "Software"), to deal 8585f8587Sbellard * in the Software without restriction, including without limitation the rights 9585f8587Sbellard * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 10585f8587Sbellard * copies of the Software, and to permit persons to whom the Software is 11585f8587Sbellard * furnished to do so, subject to the following conditions: 12585f8587Sbellard * 13585f8587Sbellard * The above copyright notice and this permission notice shall be included in 14585f8587Sbellard * all copies or substantial portions of the Software. 15585f8587Sbellard * 16585f8587Sbellard * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 17585f8587Sbellard * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 18585f8587Sbellard * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 19585f8587Sbellard * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 20585f8587Sbellard * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 21585f8587Sbellard * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 22585f8587Sbellard * THE SOFTWARE. 23585f8587Sbellard */ 24faf07963Spbrook #include "qemu-common.h" 25585f8587Sbellard #include "block_int.h" 265efa9d5aSAnthony Liguori #include "module.h" 27585f8587Sbellard #include <zlib.h> 28585f8587Sbellard #include "aes.h" 29f7d0fe02SKevin Wolf #include "block/qcow2.h" 30a9420734SKevin Wolf #include "qemu-error.h" 31e8cdcec1SKevin Wolf #include "qerror.h" 32585f8587Sbellard 33585f8587Sbellard /* 34585f8587Sbellard Differences with QCOW: 35585f8587Sbellard 36585f8587Sbellard - Support for multiple incremental snapshots. 37585f8587Sbellard - Memory management by reference counts. 38585f8587Sbellard - Clusters which have a reference count of one have the bit 39585f8587Sbellard QCOW_OFLAG_COPIED to optimize write performance. 40585f8587Sbellard - Size of compressed clusters is stored in sectors to reduce bit usage 41585f8587Sbellard in the cluster offsets. 42585f8587Sbellard - Support for storing additional data (such as the VM state) in the 43585f8587Sbellard snapshots. 44585f8587Sbellard - If a backing store is used, the cluster size is not constrained 45585f8587Sbellard (could be backported to QCOW). 46585f8587Sbellard - L2 tables have always a size of one cluster. 47585f8587Sbellard */ 48585f8587Sbellard 499b80ddf3Saliguori 509b80ddf3Saliguori typedef struct { 519b80ddf3Saliguori uint32_t magic; 529b80ddf3Saliguori uint32_t len; 539b80ddf3Saliguori } QCowExtension; 547c80ab3fSJes Sorensen #define QCOW2_EXT_MAGIC_END 0 557c80ab3fSJes Sorensen #define QCOW2_EXT_MAGIC_BACKING_FORMAT 0xE2792ACA 569b80ddf3Saliguori 577c80ab3fSJes Sorensen static int qcow2_probe(const uint8_t *buf, int buf_size, const char *filename) 58585f8587Sbellard { 59585f8587Sbellard const QCowHeader *cow_header = (const void *)buf; 60585f8587Sbellard 61585f8587Sbellard if (buf_size >= sizeof(QCowHeader) && 62585f8587Sbellard be32_to_cpu(cow_header->magic) == QCOW_MAGIC && 63e8cdcec1SKevin Wolf be32_to_cpu(cow_header->version) >= QCOW_VERSION) 64585f8587Sbellard return 100; 65585f8587Sbellard else 66585f8587Sbellard return 0; 67585f8587Sbellard } 68585f8587Sbellard 699b80ddf3Saliguori 709b80ddf3Saliguori /* 719b80ddf3Saliguori * read qcow2 extension and fill bs 729b80ddf3Saliguori * start reading from start_offset 739b80ddf3Saliguori * finish reading upon magic of value 0 or when end_offset reached 749b80ddf3Saliguori * unknown magic is skipped (future extension this version knows nothing about) 759b80ddf3Saliguori * return 0 upon success, non-0 otherwise 769b80ddf3Saliguori */ 777c80ab3fSJes Sorensen static int qcow2_read_extensions(BlockDriverState *bs, uint64_t start_offset, 789b80ddf3Saliguori uint64_t end_offset) 799b80ddf3Saliguori { 809b80ddf3Saliguori QCowExtension ext; 819b80ddf3Saliguori uint64_t offset; 829b80ddf3Saliguori 839b80ddf3Saliguori #ifdef DEBUG_EXT 847c80ab3fSJes Sorensen printf("qcow2_read_extensions: start=%ld end=%ld\n", start_offset, end_offset); 859b80ddf3Saliguori #endif 869b80ddf3Saliguori offset = start_offset; 879b80ddf3Saliguori while (offset < end_offset) { 889b80ddf3Saliguori 899b80ddf3Saliguori #ifdef DEBUG_EXT 906cbc3031SPhilipp Hahn BDRVQcowState *s = bs->opaque; 919b80ddf3Saliguori /* Sanity check */ 929b80ddf3Saliguori if (offset > s->cluster_size) 937c80ab3fSJes Sorensen printf("qcow2_read_extension: suspicious offset %lu\n", offset); 949b80ddf3Saliguori 959b80ddf3Saliguori printf("attemting to read extended header in offset %lu\n", offset); 969b80ddf3Saliguori #endif 979b80ddf3Saliguori 9866f82ceeSKevin Wolf if (bdrv_pread(bs->file, offset, &ext, sizeof(ext)) != sizeof(ext)) { 997c80ab3fSJes Sorensen fprintf(stderr, "qcow2_read_extension: ERROR: " 1000bfcd599SBlue Swirl "pread fail from offset %" PRIu64 "\n", 1010bfcd599SBlue Swirl offset); 1029b80ddf3Saliguori return 1; 1039b80ddf3Saliguori } 1049b80ddf3Saliguori be32_to_cpus(&ext.magic); 1059b80ddf3Saliguori be32_to_cpus(&ext.len); 1069b80ddf3Saliguori offset += sizeof(ext); 1079b80ddf3Saliguori #ifdef DEBUG_EXT 1089b80ddf3Saliguori printf("ext.magic = 0x%x\n", ext.magic); 1099b80ddf3Saliguori #endif 1109b80ddf3Saliguori switch (ext.magic) { 1117c80ab3fSJes Sorensen case QCOW2_EXT_MAGIC_END: 1129b80ddf3Saliguori return 0; 113f965509cSaliguori 1147c80ab3fSJes Sorensen case QCOW2_EXT_MAGIC_BACKING_FORMAT: 115f965509cSaliguori if (ext.len >= sizeof(bs->backing_format)) { 116f965509cSaliguori fprintf(stderr, "ERROR: ext_backing_format: len=%u too large" 1174c978075Saliguori " (>=%zu)\n", 118f965509cSaliguori ext.len, sizeof(bs->backing_format)); 119f965509cSaliguori return 2; 120f965509cSaliguori } 12166f82ceeSKevin Wolf if (bdrv_pread(bs->file, offset , bs->backing_format, 122f965509cSaliguori ext.len) != ext.len) 123f965509cSaliguori return 3; 124f965509cSaliguori bs->backing_format[ext.len] = '\0'; 125f965509cSaliguori #ifdef DEBUG_EXT 126f965509cSaliguori printf("Qcow2: Got format extension %s\n", bs->backing_format); 127f965509cSaliguori #endif 128e1c7f0e3SKevin Wolf offset = ((offset + ext.len + 7) & ~7); 129f965509cSaliguori break; 130f965509cSaliguori 1319b80ddf3Saliguori default: 1329b80ddf3Saliguori /* unknown magic -- just skip it */ 133e1c7f0e3SKevin Wolf offset = ((offset + ext.len + 7) & ~7); 1349b80ddf3Saliguori break; 1359b80ddf3Saliguori } 1369b80ddf3Saliguori } 1379b80ddf3Saliguori 1389b80ddf3Saliguori return 0; 1399b80ddf3Saliguori } 1409b80ddf3Saliguori 1419b80ddf3Saliguori 1427c80ab3fSJes Sorensen static int qcow2_open(BlockDriverState *bs, int flags) 143585f8587Sbellard { 144585f8587Sbellard BDRVQcowState *s = bs->opaque; 1456d85a57eSJes Sorensen int len, i, ret = 0; 146585f8587Sbellard QCowHeader header; 1479b80ddf3Saliguori uint64_t ext_end; 14829c1a730SKevin Wolf bool writethrough; 149585f8587Sbellard 1506d85a57eSJes Sorensen ret = bdrv_pread(bs->file, 0, &header, sizeof(header)); 1516d85a57eSJes Sorensen if (ret < 0) { 152585f8587Sbellard goto fail; 1536d85a57eSJes Sorensen } 154585f8587Sbellard be32_to_cpus(&header.magic); 155585f8587Sbellard be32_to_cpus(&header.version); 156585f8587Sbellard be64_to_cpus(&header.backing_file_offset); 157585f8587Sbellard be32_to_cpus(&header.backing_file_size); 158585f8587Sbellard be64_to_cpus(&header.size); 159585f8587Sbellard be32_to_cpus(&header.cluster_bits); 160585f8587Sbellard be32_to_cpus(&header.crypt_method); 161585f8587Sbellard be64_to_cpus(&header.l1_table_offset); 162585f8587Sbellard be32_to_cpus(&header.l1_size); 163585f8587Sbellard be64_to_cpus(&header.refcount_table_offset); 164585f8587Sbellard be32_to_cpus(&header.refcount_table_clusters); 165585f8587Sbellard be64_to_cpus(&header.snapshots_offset); 166585f8587Sbellard be32_to_cpus(&header.nb_snapshots); 167585f8587Sbellard 168e8cdcec1SKevin Wolf if (header.magic != QCOW_MAGIC) { 1696d85a57eSJes Sorensen ret = -EINVAL; 170585f8587Sbellard goto fail; 1716d85a57eSJes Sorensen } 172e8cdcec1SKevin Wolf if (header.version != QCOW_VERSION) { 173e8cdcec1SKevin Wolf char version[64]; 174e8cdcec1SKevin Wolf snprintf(version, sizeof(version), "QCOW version %d", header.version); 175e8cdcec1SKevin Wolf qerror_report(QERR_UNKNOWN_BLOCK_FORMAT_FEATURE, 176e8cdcec1SKevin Wolf bs->device_name, "qcow2", version); 177e8cdcec1SKevin Wolf ret = -ENOTSUP; 178e8cdcec1SKevin Wolf goto fail; 179e8cdcec1SKevin Wolf } 180d191d12dSStefan Weil if (header.cluster_bits < MIN_CLUSTER_BITS || 1816d85a57eSJes Sorensen header.cluster_bits > MAX_CLUSTER_BITS) { 1826d85a57eSJes Sorensen ret = -EINVAL; 183585f8587Sbellard goto fail; 1846d85a57eSJes Sorensen } 1856d85a57eSJes Sorensen if (header.crypt_method > QCOW_CRYPT_AES) { 1866d85a57eSJes Sorensen ret = -EINVAL; 187585f8587Sbellard goto fail; 1886d85a57eSJes Sorensen } 189585f8587Sbellard s->crypt_method_header = header.crypt_method; 1906d85a57eSJes Sorensen if (s->crypt_method_header) { 191585f8587Sbellard bs->encrypted = 1; 1926d85a57eSJes Sorensen } 193585f8587Sbellard s->cluster_bits = header.cluster_bits; 194585f8587Sbellard s->cluster_size = 1 << s->cluster_bits; 195585f8587Sbellard s->cluster_sectors = 1 << (s->cluster_bits - 9); 196585f8587Sbellard s->l2_bits = s->cluster_bits - 3; /* L2 is always one cluster */ 197585f8587Sbellard s->l2_size = 1 << s->l2_bits; 198585f8587Sbellard bs->total_sectors = header.size / 512; 199585f8587Sbellard s->csize_shift = (62 - (s->cluster_bits - 8)); 200585f8587Sbellard s->csize_mask = (1 << (s->cluster_bits - 8)) - 1; 201585f8587Sbellard s->cluster_offset_mask = (1LL << s->csize_shift) - 1; 202585f8587Sbellard s->refcount_table_offset = header.refcount_table_offset; 203585f8587Sbellard s->refcount_table_size = 204585f8587Sbellard header.refcount_table_clusters << (s->cluster_bits - 3); 205585f8587Sbellard 206585f8587Sbellard s->snapshots_offset = header.snapshots_offset; 207585f8587Sbellard s->nb_snapshots = header.nb_snapshots; 208585f8587Sbellard 209585f8587Sbellard /* read the level 1 table */ 210585f8587Sbellard s->l1_size = header.l1_size; 211419b19d9SStefan Hajnoczi s->l1_vm_state_index = size_to_l1(s, header.size); 212585f8587Sbellard /* the L1 table must contain at least enough entries to put 213585f8587Sbellard header.size bytes */ 2146d85a57eSJes Sorensen if (s->l1_size < s->l1_vm_state_index) { 2156d85a57eSJes Sorensen ret = -EINVAL; 216585f8587Sbellard goto fail; 2176d85a57eSJes Sorensen } 218585f8587Sbellard s->l1_table_offset = header.l1_table_offset; 219d191d12dSStefan Weil if (s->l1_size > 0) { 2207267c094SAnthony Liguori s->l1_table = g_malloc0( 2213f6a3ee5SKevin Wolf align_offset(s->l1_size * sizeof(uint64_t), 512)); 2226d85a57eSJes Sorensen ret = bdrv_pread(bs->file, s->l1_table_offset, s->l1_table, 2236d85a57eSJes Sorensen s->l1_size * sizeof(uint64_t)); 2246d85a57eSJes Sorensen if (ret < 0) { 225585f8587Sbellard goto fail; 2266d85a57eSJes Sorensen } 227585f8587Sbellard for(i = 0;i < s->l1_size; i++) { 228585f8587Sbellard be64_to_cpus(&s->l1_table[i]); 229585f8587Sbellard } 230d191d12dSStefan Weil } 23129c1a730SKevin Wolf 23229c1a730SKevin Wolf /* alloc L2 table/refcount block cache */ 233a6599793SChristoph Hellwig writethrough = ((flags & BDRV_O_CACHE_WB) == 0); 23429c1a730SKevin Wolf s->l2_table_cache = qcow2_cache_create(bs, L2_CACHE_SIZE, writethrough); 23529c1a730SKevin Wolf s->refcount_block_cache = qcow2_cache_create(bs, REFCOUNT_CACHE_SIZE, 23629c1a730SKevin Wolf writethrough); 23729c1a730SKevin Wolf 2387267c094SAnthony Liguori s->cluster_cache = g_malloc(s->cluster_size); 239585f8587Sbellard /* one more sector for decompressed data alignment */ 2407267c094SAnthony Liguori s->cluster_data = g_malloc(QCOW_MAX_CRYPT_CLUSTERS * s->cluster_size 241095a9c58Saliguori + 512); 242585f8587Sbellard s->cluster_cache_offset = -1; 243585f8587Sbellard 2446d85a57eSJes Sorensen ret = qcow2_refcount_init(bs); 2456d85a57eSJes Sorensen if (ret != 0) { 246585f8587Sbellard goto fail; 2476d85a57eSJes Sorensen } 248585f8587Sbellard 24972cf2d4fSBlue Swirl QLIST_INIT(&s->cluster_allocs); 250f214978aSKevin Wolf 2519b80ddf3Saliguori /* read qcow2 extensions */ 2526d85a57eSJes Sorensen if (header.backing_file_offset) { 2539b80ddf3Saliguori ext_end = header.backing_file_offset; 2546d85a57eSJes Sorensen } else { 2559b80ddf3Saliguori ext_end = s->cluster_size; 2566d85a57eSJes Sorensen } 2576d85a57eSJes Sorensen if (qcow2_read_extensions(bs, sizeof(header), ext_end)) { 2586d85a57eSJes Sorensen ret = -EINVAL; 2599b80ddf3Saliguori goto fail; 2606d85a57eSJes Sorensen } 2619b80ddf3Saliguori 262585f8587Sbellard /* read the backing file name */ 263585f8587Sbellard if (header.backing_file_offset != 0) { 264585f8587Sbellard len = header.backing_file_size; 2656d85a57eSJes Sorensen if (len > 1023) { 266585f8587Sbellard len = 1023; 2676d85a57eSJes Sorensen } 2686d85a57eSJes Sorensen ret = bdrv_pread(bs->file, header.backing_file_offset, 2696d85a57eSJes Sorensen bs->backing_file, len); 2706d85a57eSJes Sorensen if (ret < 0) { 271585f8587Sbellard goto fail; 2726d85a57eSJes Sorensen } 273585f8587Sbellard bs->backing_file[len] = '\0'; 274585f8587Sbellard } 2756d85a57eSJes Sorensen if (qcow2_read_snapshots(bs) < 0) { 2766d85a57eSJes Sorensen ret = -EINVAL; 277585f8587Sbellard goto fail; 2786d85a57eSJes Sorensen } 279585f8587Sbellard 28068d100e9SKevin Wolf /* Initialise locks */ 28168d100e9SKevin Wolf qemu_co_mutex_init(&s->lock); 28268d100e9SKevin Wolf 283585f8587Sbellard #ifdef DEBUG_ALLOC 2846cbc3031SPhilipp Hahn { 2856cbc3031SPhilipp Hahn BdrvCheckResult result = {0}; 2866cbc3031SPhilipp Hahn qcow2_check_refcounts(bs, &result); 2876cbc3031SPhilipp Hahn } 288585f8587Sbellard #endif 2896d85a57eSJes Sorensen return ret; 290585f8587Sbellard 291585f8587Sbellard fail: 292ed6ccf0fSKevin Wolf qcow2_free_snapshots(bs); 293ed6ccf0fSKevin Wolf qcow2_refcount_close(bs); 2947267c094SAnthony Liguori g_free(s->l1_table); 29529c1a730SKevin Wolf if (s->l2_table_cache) { 29629c1a730SKevin Wolf qcow2_cache_destroy(bs, s->l2_table_cache); 29729c1a730SKevin Wolf } 2987267c094SAnthony Liguori g_free(s->cluster_cache); 2997267c094SAnthony Liguori g_free(s->cluster_data); 3006d85a57eSJes Sorensen return ret; 301585f8587Sbellard } 302585f8587Sbellard 3037c80ab3fSJes Sorensen static int qcow2_set_key(BlockDriverState *bs, const char *key) 304585f8587Sbellard { 305585f8587Sbellard BDRVQcowState *s = bs->opaque; 306585f8587Sbellard uint8_t keybuf[16]; 307585f8587Sbellard int len, i; 308585f8587Sbellard 309585f8587Sbellard memset(keybuf, 0, 16); 310585f8587Sbellard len = strlen(key); 311585f8587Sbellard if (len > 16) 312585f8587Sbellard len = 16; 313585f8587Sbellard /* XXX: we could compress the chars to 7 bits to increase 314585f8587Sbellard entropy */ 315585f8587Sbellard for(i = 0;i < len;i++) { 316585f8587Sbellard keybuf[i] = key[i]; 317585f8587Sbellard } 318585f8587Sbellard s->crypt_method = s->crypt_method_header; 319585f8587Sbellard 320585f8587Sbellard if (AES_set_encrypt_key(keybuf, 128, &s->aes_encrypt_key) != 0) 321585f8587Sbellard return -1; 322585f8587Sbellard if (AES_set_decrypt_key(keybuf, 128, &s->aes_decrypt_key) != 0) 323585f8587Sbellard return -1; 324585f8587Sbellard #if 0 325585f8587Sbellard /* test */ 326585f8587Sbellard { 327585f8587Sbellard uint8_t in[16]; 328585f8587Sbellard uint8_t out[16]; 329585f8587Sbellard uint8_t tmp[16]; 330585f8587Sbellard for(i=0;i<16;i++) 331585f8587Sbellard in[i] = i; 332585f8587Sbellard AES_encrypt(in, tmp, &s->aes_encrypt_key); 333585f8587Sbellard AES_decrypt(tmp, out, &s->aes_decrypt_key); 334585f8587Sbellard for(i = 0; i < 16; i++) 335585f8587Sbellard printf(" %02x", tmp[i]); 336585f8587Sbellard printf("\n"); 337585f8587Sbellard for(i = 0; i < 16; i++) 338585f8587Sbellard printf(" %02x", out[i]); 339585f8587Sbellard printf("\n"); 340585f8587Sbellard } 341585f8587Sbellard #endif 342585f8587Sbellard return 0; 343585f8587Sbellard } 344585f8587Sbellard 3457c80ab3fSJes Sorensen static int qcow2_is_allocated(BlockDriverState *bs, int64_t sector_num, 346585f8587Sbellard int nb_sectors, int *pnum) 347585f8587Sbellard { 348585f8587Sbellard uint64_t cluster_offset; 3491c46efaaSKevin Wolf int ret; 350585f8587Sbellard 351095a9c58Saliguori *pnum = nb_sectors; 3521c46efaaSKevin Wolf /* FIXME We can get errors here, but the bdrv_is_allocated interface can't 3531c46efaaSKevin Wolf * pass them on today */ 3541c46efaaSKevin Wolf ret = qcow2_get_cluster_offset(bs, sector_num << 9, pnum, &cluster_offset); 3551c46efaaSKevin Wolf if (ret < 0) { 3561c46efaaSKevin Wolf *pnum = 0; 3571c46efaaSKevin Wolf } 358095a9c58Saliguori 359585f8587Sbellard return (cluster_offset != 0); 360585f8587Sbellard } 361585f8587Sbellard 362a9465922Sbellard /* handle reading after the end of the backing file */ 363bd28f835SKevin Wolf int qcow2_backing_read1(BlockDriverState *bs, QEMUIOVector *qiov, 364bd28f835SKevin Wolf int64_t sector_num, int nb_sectors) 365a9465922Sbellard { 366a9465922Sbellard int n1; 367a9465922Sbellard if ((sector_num + nb_sectors) <= bs->total_sectors) 368a9465922Sbellard return nb_sectors; 369a9465922Sbellard if (sector_num >= bs->total_sectors) 370a9465922Sbellard n1 = 0; 371a9465922Sbellard else 372a9465922Sbellard n1 = bs->total_sectors - sector_num; 373bd28f835SKevin Wolf 374e0d9c6f9SChunqiang Tang qemu_iovec_memset_skip(qiov, 0, 512 * (nb_sectors - n1), 512 * n1); 375bd28f835SKevin Wolf 376a9465922Sbellard return n1; 377a9465922Sbellard } 378a9465922Sbellard 379*3fc48d09SFrediano Ziglio static int qcow2_co_readv(BlockDriverState *bs, int64_t sector_num, 380*3fc48d09SFrediano Ziglio int remaining_sectors, QEMUIOVector *qiov) 3811490791fSaliguori { 382585f8587Sbellard BDRVQcowState *s = bs->opaque; 383a9465922Sbellard int index_in_cluster, n1; 38468d100e9SKevin Wolf int ret; 385faf575c1SFrediano Ziglio int cur_nr_sectors; /* number of sectors in current iteration */ 386c2bdd990SFrediano Ziglio uint64_t cluster_offset = 0; 387*3fc48d09SFrediano Ziglio uint64_t bytes_done = 0; 388*3fc48d09SFrediano Ziglio QEMUIOVector hd_qiov; 389*3fc48d09SFrediano Ziglio uint8_t *cluster_data = NULL; 390585f8587Sbellard 391*3fc48d09SFrediano Ziglio qemu_iovec_init(&hd_qiov, qiov->niov); 392*3fc48d09SFrediano Ziglio 393*3fc48d09SFrediano Ziglio qemu_co_mutex_lock(&s->lock); 394*3fc48d09SFrediano Ziglio 395*3fc48d09SFrediano Ziglio while (remaining_sectors != 0) { 396585f8587Sbellard 397faf575c1SFrediano Ziglio /* prepare next request */ 398*3fc48d09SFrediano Ziglio cur_nr_sectors = remaining_sectors; 399bd28f835SKevin Wolf if (s->crypt_method) { 400faf575c1SFrediano Ziglio cur_nr_sectors = MIN(cur_nr_sectors, 401bd28f835SKevin Wolf QCOW_MAX_CRYPT_CLUSTERS * s->cluster_sectors); 402bd28f835SKevin Wolf } 403bd28f835SKevin Wolf 404*3fc48d09SFrediano Ziglio ret = qcow2_get_cluster_offset(bs, sector_num << 9, 405c2bdd990SFrediano Ziglio &cur_nr_sectors, &cluster_offset); 4061c46efaaSKevin Wolf if (ret < 0) { 407*3fc48d09SFrediano Ziglio goto fail; 4081c46efaaSKevin Wolf } 4091c46efaaSKevin Wolf 410*3fc48d09SFrediano Ziglio index_in_cluster = sector_num & (s->cluster_sectors - 1); 411585f8587Sbellard 412*3fc48d09SFrediano Ziglio qemu_iovec_reset(&hd_qiov); 413*3fc48d09SFrediano Ziglio qemu_iovec_copy(&hd_qiov, qiov, bytes_done, 414faf575c1SFrediano Ziglio cur_nr_sectors * 512); 415bd28f835SKevin Wolf 416c2bdd990SFrediano Ziglio if (!cluster_offset) { 417bd28f835SKevin Wolf 418585f8587Sbellard if (bs->backing_hd) { 419585f8587Sbellard /* read from the base image */ 420*3fc48d09SFrediano Ziglio n1 = qcow2_backing_read1(bs->backing_hd, &hd_qiov, 421*3fc48d09SFrediano Ziglio sector_num, cur_nr_sectors); 422a9465922Sbellard if (n1 > 0) { 42366f82ceeSKevin Wolf BLKDBG_EVENT(bs->file, BLKDBG_READ_BACKING_AIO); 42468d100e9SKevin Wolf qemu_co_mutex_unlock(&s->lock); 425*3fc48d09SFrediano Ziglio ret = bdrv_co_readv(bs->backing_hd, sector_num, 426*3fc48d09SFrediano Ziglio n1, &hd_qiov); 42768d100e9SKevin Wolf qemu_co_mutex_lock(&s->lock); 42868d100e9SKevin Wolf if (ret < 0) { 429*3fc48d09SFrediano Ziglio goto fail; 4303ab4c7e9SKevin Wolf } 4311490791fSaliguori } 432a9465922Sbellard } else { 433585f8587Sbellard /* Note: in this case, no need to wait */ 434*3fc48d09SFrediano Ziglio qemu_iovec_memset(&hd_qiov, 0, 512 * cur_nr_sectors); 4351490791fSaliguori } 436c2bdd990SFrediano Ziglio } else if (cluster_offset & QCOW_OFLAG_COMPRESSED) { 437585f8587Sbellard /* add AIO support for compressed blocks ? */ 438c2bdd990SFrediano Ziglio ret = qcow2_decompress_cluster(bs, cluster_offset); 4398af36488SKevin Wolf if (ret < 0) { 440*3fc48d09SFrediano Ziglio goto fail; 4418af36488SKevin Wolf } 442bd28f835SKevin Wolf 443*3fc48d09SFrediano Ziglio qemu_iovec_from_buffer(&hd_qiov, 444bd28f835SKevin Wolf s->cluster_cache + index_in_cluster * 512, 445faf575c1SFrediano Ziglio 512 * cur_nr_sectors); 446585f8587Sbellard } else { 447c2bdd990SFrediano Ziglio if ((cluster_offset & 511) != 0) { 448*3fc48d09SFrediano Ziglio ret = -EIO; 449*3fc48d09SFrediano Ziglio goto fail; 450585f8587Sbellard } 451c87c0672Saliguori 452bd28f835SKevin Wolf if (s->crypt_method) { 453bd28f835SKevin Wolf /* 454bd28f835SKevin Wolf * For encrypted images, read everything into a temporary 455bd28f835SKevin Wolf * contiguous buffer on which the AES functions can work. 456bd28f835SKevin Wolf */ 457*3fc48d09SFrediano Ziglio if (!cluster_data) { 458*3fc48d09SFrediano Ziglio cluster_data = 4597267c094SAnthony Liguori g_malloc0(QCOW_MAX_CRYPT_CLUSTERS * s->cluster_size); 460bd28f835SKevin Wolf } 461bd28f835SKevin Wolf 462faf575c1SFrediano Ziglio assert(cur_nr_sectors <= 463bd28f835SKevin Wolf QCOW_MAX_CRYPT_CLUSTERS * s->cluster_sectors); 464*3fc48d09SFrediano Ziglio qemu_iovec_reset(&hd_qiov); 465*3fc48d09SFrediano Ziglio qemu_iovec_add(&hd_qiov, cluster_data, 466faf575c1SFrediano Ziglio 512 * cur_nr_sectors); 467bd28f835SKevin Wolf } 468bd28f835SKevin Wolf 46966f82ceeSKevin Wolf BLKDBG_EVENT(bs->file, BLKDBG_READ_AIO); 47068d100e9SKevin Wolf qemu_co_mutex_unlock(&s->lock); 47168d100e9SKevin Wolf ret = bdrv_co_readv(bs->file, 472c2bdd990SFrediano Ziglio (cluster_offset >> 9) + index_in_cluster, 473*3fc48d09SFrediano Ziglio cur_nr_sectors, &hd_qiov); 47468d100e9SKevin Wolf qemu_co_mutex_lock(&s->lock); 47568d100e9SKevin Wolf if (ret < 0) { 476*3fc48d09SFrediano Ziglio goto fail; 477585f8587Sbellard } 478faf575c1SFrediano Ziglio if (s->crypt_method) { 479*3fc48d09SFrediano Ziglio qcow2_encrypt_sectors(s, sector_num, cluster_data, 480*3fc48d09SFrediano Ziglio cluster_data, cur_nr_sectors, 0, &s->aes_decrypt_key); 481*3fc48d09SFrediano Ziglio qemu_iovec_reset(&hd_qiov); 482*3fc48d09SFrediano Ziglio qemu_iovec_copy(&hd_qiov, qiov, bytes_done, 483faf575c1SFrediano Ziglio cur_nr_sectors * 512); 484*3fc48d09SFrediano Ziglio qemu_iovec_from_buffer(&hd_qiov, cluster_data, 485faf575c1SFrediano Ziglio 512 * cur_nr_sectors); 486171e3d6bSKevin Wolf } 487faf575c1SFrediano Ziglio } 488faf575c1SFrediano Ziglio 489*3fc48d09SFrediano Ziglio remaining_sectors -= cur_nr_sectors; 490*3fc48d09SFrediano Ziglio sector_num += cur_nr_sectors; 491*3fc48d09SFrediano Ziglio bytes_done += cur_nr_sectors * 512; 4925ebaa27eSFrediano Ziglio } 493*3fc48d09SFrediano Ziglio ret = 0; 494f141eafeSaliguori 495*3fc48d09SFrediano Ziglio fail: 49668d100e9SKevin Wolf qemu_co_mutex_unlock(&s->lock); 49768d100e9SKevin Wolf 498*3fc48d09SFrediano Ziglio qemu_iovec_destroy(&hd_qiov); 49968d100e9SKevin Wolf 50068d100e9SKevin Wolf return ret; 501585f8587Sbellard } 502585f8587Sbellard 50368d100e9SKevin Wolf static void run_dependent_requests(BDRVQcowState *s, QCowL2Meta *m) 504f214978aSKevin Wolf { 505f214978aSKevin Wolf /* Take the request off the list of running requests */ 506f214978aSKevin Wolf if (m->nb_clusters != 0) { 50772cf2d4fSBlue Swirl QLIST_REMOVE(m, next_in_flight); 508f214978aSKevin Wolf } 509f214978aSKevin Wolf 510d4c146f0SStefan Hajnoczi /* Restart all dependent requests */ 51168d100e9SKevin Wolf if (!qemu_co_queue_empty(&m->dependent_requests)) { 51268d100e9SKevin Wolf qemu_co_mutex_unlock(&s->lock); 51368d100e9SKevin Wolf while(qemu_co_queue_next(&m->dependent_requests)); 51468d100e9SKevin Wolf qemu_co_mutex_lock(&s->lock); 51568d100e9SKevin Wolf } 516f214978aSKevin Wolf } 517f214978aSKevin Wolf 518*3fc48d09SFrediano Ziglio static int qcow2_co_writev(BlockDriverState *bs, 519*3fc48d09SFrediano Ziglio int64_t sector_num, 520*3fc48d09SFrediano Ziglio int remaining_sectors, 521*3fc48d09SFrediano Ziglio QEMUIOVector *qiov) 522585f8587Sbellard { 523585f8587Sbellard BDRVQcowState *s = bs->opaque; 524585f8587Sbellard int index_in_cluster; 525095a9c58Saliguori int n_end; 52668d100e9SKevin Wolf int ret; 527faf575c1SFrediano Ziglio int cur_nr_sectors; /* number of sectors in current iteration */ 528c2271403SFrediano Ziglio QCowL2Meta l2meta; 529c2bdd990SFrediano Ziglio uint64_t cluster_offset; 530*3fc48d09SFrediano Ziglio QEMUIOVector hd_qiov; 531*3fc48d09SFrediano Ziglio uint64_t bytes_done = 0; 532*3fc48d09SFrediano Ziglio uint8_t *cluster_data = NULL; 533c2271403SFrediano Ziglio 534c2271403SFrediano Ziglio l2meta.nb_clusters = 0; 535c2271403SFrediano Ziglio qemu_co_queue_init(&l2meta.dependent_requests); 536585f8587Sbellard 537*3fc48d09SFrediano Ziglio qemu_iovec_init(&hd_qiov, qiov->niov); 538585f8587Sbellard 539*3fc48d09SFrediano Ziglio s->cluster_cache_offset = -1; /* disable compressed cache */ 540*3fc48d09SFrediano Ziglio 541*3fc48d09SFrediano Ziglio qemu_co_mutex_lock(&s->lock); 542*3fc48d09SFrediano Ziglio 543*3fc48d09SFrediano Ziglio while (remaining_sectors != 0) { 544*3fc48d09SFrediano Ziglio 545*3fc48d09SFrediano Ziglio index_in_cluster = sector_num & (s->cluster_sectors - 1); 546*3fc48d09SFrediano Ziglio n_end = index_in_cluster + remaining_sectors; 547095a9c58Saliguori if (s->crypt_method && 5485ebaa27eSFrediano Ziglio n_end > QCOW_MAX_CRYPT_CLUSTERS * s->cluster_sectors) { 549095a9c58Saliguori n_end = QCOW_MAX_CRYPT_CLUSTERS * s->cluster_sectors; 5505ebaa27eSFrediano Ziglio } 551095a9c58Saliguori 552*3fc48d09SFrediano Ziglio ret = qcow2_alloc_cluster_offset(bs, sector_num << 9, 553c2271403SFrediano Ziglio index_in_cluster, n_end, &cur_nr_sectors, &l2meta); 554148da7eaSKevin Wolf if (ret < 0) { 555*3fc48d09SFrediano Ziglio goto fail; 556148da7eaSKevin Wolf } 557148da7eaSKevin Wolf 558c2bdd990SFrediano Ziglio cluster_offset = l2meta.cluster_offset; 559c2bdd990SFrediano Ziglio assert((cluster_offset & 511) == 0); 560148da7eaSKevin Wolf 561*3fc48d09SFrediano Ziglio qemu_iovec_reset(&hd_qiov); 562*3fc48d09SFrediano Ziglio qemu_iovec_copy(&hd_qiov, qiov, bytes_done, 563faf575c1SFrediano Ziglio cur_nr_sectors * 512); 5646f5f060bSKevin Wolf 565585f8587Sbellard if (s->crypt_method) { 566*3fc48d09SFrediano Ziglio if (!cluster_data) { 567*3fc48d09SFrediano Ziglio cluster_data = g_malloc0(QCOW_MAX_CRYPT_CLUSTERS * 568095a9c58Saliguori s->cluster_size); 569585f8587Sbellard } 5706f5f060bSKevin Wolf 571*3fc48d09SFrediano Ziglio assert(hd_qiov.size <= 5725ebaa27eSFrediano Ziglio QCOW_MAX_CRYPT_CLUSTERS * s->cluster_size); 573*3fc48d09SFrediano Ziglio qemu_iovec_to_buffer(&hd_qiov, cluster_data); 5746f5f060bSKevin Wolf 575*3fc48d09SFrediano Ziglio qcow2_encrypt_sectors(s, sector_num, cluster_data, 576*3fc48d09SFrediano Ziglio cluster_data, cur_nr_sectors, 1, &s->aes_encrypt_key); 5776f5f060bSKevin Wolf 578*3fc48d09SFrediano Ziglio qemu_iovec_reset(&hd_qiov); 579*3fc48d09SFrediano Ziglio qemu_iovec_add(&hd_qiov, cluster_data, 580faf575c1SFrediano Ziglio cur_nr_sectors * 512); 581585f8587Sbellard } 5826f5f060bSKevin Wolf 58366f82ceeSKevin Wolf BLKDBG_EVENT(bs->file, BLKDBG_WRITE_AIO); 58468d100e9SKevin Wolf qemu_co_mutex_unlock(&s->lock); 58568d100e9SKevin Wolf ret = bdrv_co_writev(bs->file, 586c2bdd990SFrediano Ziglio (cluster_offset >> 9) + index_in_cluster, 587*3fc48d09SFrediano Ziglio cur_nr_sectors, &hd_qiov); 58868d100e9SKevin Wolf qemu_co_mutex_lock(&s->lock); 58968d100e9SKevin Wolf if (ret < 0) { 590*3fc48d09SFrediano Ziglio goto fail; 591171e3d6bSKevin Wolf } 592f141eafeSaliguori 593c2271403SFrediano Ziglio ret = qcow2_alloc_cluster_link_l2(bs, &l2meta); 594faf575c1SFrediano Ziglio 595c2271403SFrediano Ziglio run_dependent_requests(s, &l2meta); 596faf575c1SFrediano Ziglio 597faf575c1SFrediano Ziglio if (ret < 0) { 598*3fc48d09SFrediano Ziglio goto fail; 599faf575c1SFrediano Ziglio } 600faf575c1SFrediano Ziglio 601*3fc48d09SFrediano Ziglio remaining_sectors -= cur_nr_sectors; 602*3fc48d09SFrediano Ziglio sector_num += cur_nr_sectors; 603*3fc48d09SFrediano Ziglio bytes_done += cur_nr_sectors * 512; 6045ebaa27eSFrediano Ziglio } 605*3fc48d09SFrediano Ziglio ret = 0; 606faf575c1SFrediano Ziglio 607*3fc48d09SFrediano Ziglio fail: 60868d100e9SKevin Wolf qemu_co_mutex_unlock(&s->lock); 609585f8587Sbellard 610*3fc48d09SFrediano Ziglio qemu_iovec_destroy(&hd_qiov); 61142496d62SKevin Wolf 61268d100e9SKevin Wolf return ret; 613585f8587Sbellard } 614585f8587Sbellard 6157c80ab3fSJes Sorensen static void qcow2_close(BlockDriverState *bs) 616585f8587Sbellard { 617585f8587Sbellard BDRVQcowState *s = bs->opaque; 6187267c094SAnthony Liguori g_free(s->l1_table); 61929c1a730SKevin Wolf 62029c1a730SKevin Wolf qcow2_cache_flush(bs, s->l2_table_cache); 62129c1a730SKevin Wolf qcow2_cache_flush(bs, s->refcount_block_cache); 62229c1a730SKevin Wolf 62329c1a730SKevin Wolf qcow2_cache_destroy(bs, s->l2_table_cache); 62429c1a730SKevin Wolf qcow2_cache_destroy(bs, s->refcount_block_cache); 62529c1a730SKevin Wolf 6267267c094SAnthony Liguori g_free(s->cluster_cache); 6277267c094SAnthony Liguori g_free(s->cluster_data); 628ed6ccf0fSKevin Wolf qcow2_refcount_close(bs); 629585f8587Sbellard } 630585f8587Sbellard 631756e6736SKevin Wolf /* 632756e6736SKevin Wolf * Updates the variable length parts of the qcow2 header, i.e. the backing file 633756e6736SKevin Wolf * name and all extensions. qcow2 was not designed to allow such changes, so if 634756e6736SKevin Wolf * we run out of space (we can only use the first cluster) this function may 635756e6736SKevin Wolf * fail. 636756e6736SKevin Wolf * 637756e6736SKevin Wolf * Returns 0 on success, -errno in error cases. 638756e6736SKevin Wolf */ 639756e6736SKevin Wolf static int qcow2_update_ext_header(BlockDriverState *bs, 640756e6736SKevin Wolf const char *backing_file, const char *backing_fmt) 641756e6736SKevin Wolf { 642756e6736SKevin Wolf size_t backing_file_len = 0; 643756e6736SKevin Wolf size_t backing_fmt_len = 0; 644756e6736SKevin Wolf BDRVQcowState *s = bs->opaque; 645756e6736SKevin Wolf QCowExtension ext_backing_fmt = {0, 0}; 646756e6736SKevin Wolf int ret; 647756e6736SKevin Wolf 648756e6736SKevin Wolf /* Backing file format doesn't make sense without a backing file */ 649756e6736SKevin Wolf if (backing_fmt && !backing_file) { 650756e6736SKevin Wolf return -EINVAL; 651756e6736SKevin Wolf } 652756e6736SKevin Wolf 653756e6736SKevin Wolf /* Prepare the backing file format extension if needed */ 654756e6736SKevin Wolf if (backing_fmt) { 655756e6736SKevin Wolf ext_backing_fmt.len = cpu_to_be32(strlen(backing_fmt)); 6567c80ab3fSJes Sorensen ext_backing_fmt.magic = cpu_to_be32(QCOW2_EXT_MAGIC_BACKING_FORMAT); 657756e6736SKevin Wolf backing_fmt_len = ((sizeof(ext_backing_fmt) 658756e6736SKevin Wolf + strlen(backing_fmt) + 7) & ~7); 659756e6736SKevin Wolf } 660756e6736SKevin Wolf 661756e6736SKevin Wolf /* Check if we can fit the new header into the first cluster */ 662756e6736SKevin Wolf if (backing_file) { 663756e6736SKevin Wolf backing_file_len = strlen(backing_file); 664756e6736SKevin Wolf } 665756e6736SKevin Wolf 666756e6736SKevin Wolf size_t header_size = sizeof(QCowHeader) + backing_file_len 667756e6736SKevin Wolf + backing_fmt_len; 668756e6736SKevin Wolf 669756e6736SKevin Wolf if (header_size > s->cluster_size) { 670756e6736SKevin Wolf return -ENOSPC; 671756e6736SKevin Wolf } 672756e6736SKevin Wolf 673756e6736SKevin Wolf /* Rewrite backing file name and qcow2 extensions */ 674756e6736SKevin Wolf size_t ext_size = header_size - sizeof(QCowHeader); 675756e6736SKevin Wolf uint8_t buf[ext_size]; 676756e6736SKevin Wolf size_t offset = 0; 677756e6736SKevin Wolf size_t backing_file_offset = 0; 678756e6736SKevin Wolf 679756e6736SKevin Wolf if (backing_file) { 680756e6736SKevin Wolf if (backing_fmt) { 681756e6736SKevin Wolf int padding = backing_fmt_len - 682756e6736SKevin Wolf (sizeof(ext_backing_fmt) + strlen(backing_fmt)); 683756e6736SKevin Wolf 684756e6736SKevin Wolf memcpy(buf + offset, &ext_backing_fmt, sizeof(ext_backing_fmt)); 685756e6736SKevin Wolf offset += sizeof(ext_backing_fmt); 686756e6736SKevin Wolf 687756e6736SKevin Wolf memcpy(buf + offset, backing_fmt, strlen(backing_fmt)); 688756e6736SKevin Wolf offset += strlen(backing_fmt); 689756e6736SKevin Wolf 690756e6736SKevin Wolf memset(buf + offset, 0, padding); 691756e6736SKevin Wolf offset += padding; 692756e6736SKevin Wolf } 693756e6736SKevin Wolf 694756e6736SKevin Wolf memcpy(buf + offset, backing_file, backing_file_len); 695756e6736SKevin Wolf backing_file_offset = sizeof(QCowHeader) + offset; 696756e6736SKevin Wolf } 697756e6736SKevin Wolf 6988b3b7206SKevin Wolf ret = bdrv_pwrite_sync(bs->file, sizeof(QCowHeader), buf, ext_size); 699756e6736SKevin Wolf if (ret < 0) { 700756e6736SKevin Wolf goto fail; 701756e6736SKevin Wolf } 702756e6736SKevin Wolf 703756e6736SKevin Wolf /* Update header fields */ 704756e6736SKevin Wolf uint64_t be_backing_file_offset = cpu_to_be64(backing_file_offset); 705756e6736SKevin Wolf uint32_t be_backing_file_size = cpu_to_be32(backing_file_len); 706756e6736SKevin Wolf 7078b3b7206SKevin Wolf ret = bdrv_pwrite_sync(bs->file, offsetof(QCowHeader, backing_file_offset), 708756e6736SKevin Wolf &be_backing_file_offset, sizeof(uint64_t)); 709756e6736SKevin Wolf if (ret < 0) { 710756e6736SKevin Wolf goto fail; 711756e6736SKevin Wolf } 712756e6736SKevin Wolf 7138b3b7206SKevin Wolf ret = bdrv_pwrite_sync(bs->file, offsetof(QCowHeader, backing_file_size), 714756e6736SKevin Wolf &be_backing_file_size, sizeof(uint32_t)); 715756e6736SKevin Wolf if (ret < 0) { 716756e6736SKevin Wolf goto fail; 717756e6736SKevin Wolf } 718756e6736SKevin Wolf 719756e6736SKevin Wolf ret = 0; 720756e6736SKevin Wolf fail: 721756e6736SKevin Wolf return ret; 722756e6736SKevin Wolf } 723756e6736SKevin Wolf 724756e6736SKevin Wolf static int qcow2_change_backing_file(BlockDriverState *bs, 725756e6736SKevin Wolf const char *backing_file, const char *backing_fmt) 726756e6736SKevin Wolf { 727756e6736SKevin Wolf return qcow2_update_ext_header(bs, backing_file, backing_fmt); 728756e6736SKevin Wolf } 729756e6736SKevin Wolf 730a35e1c17SKevin Wolf static int preallocate(BlockDriverState *bs) 731a35e1c17SKevin Wolf { 732a35e1c17SKevin Wolf uint64_t nb_sectors; 733a35e1c17SKevin Wolf uint64_t offset; 734a35e1c17SKevin Wolf int num; 735148da7eaSKevin Wolf int ret; 736a35e1c17SKevin Wolf QCowL2Meta meta; 737a35e1c17SKevin Wolf 738a35e1c17SKevin Wolf nb_sectors = bdrv_getlength(bs) >> 9; 739a35e1c17SKevin Wolf offset = 0; 74068d100e9SKevin Wolf qemu_co_queue_init(&meta.dependent_requests); 741148da7eaSKevin Wolf meta.cluster_offset = 0; 742a35e1c17SKevin Wolf 743a35e1c17SKevin Wolf while (nb_sectors) { 744a35e1c17SKevin Wolf num = MIN(nb_sectors, INT_MAX >> 9); 745148da7eaSKevin Wolf ret = qcow2_alloc_cluster_offset(bs, offset, 0, num, &num, &meta); 746148da7eaSKevin Wolf if (ret < 0) { 74719dbcbf7SKevin Wolf return ret; 748a35e1c17SKevin Wolf } 749a35e1c17SKevin Wolf 75019dbcbf7SKevin Wolf ret = qcow2_alloc_cluster_link_l2(bs, &meta); 75119dbcbf7SKevin Wolf if (ret < 0) { 752148da7eaSKevin Wolf qcow2_free_any_clusters(bs, meta.cluster_offset, meta.nb_clusters); 75319dbcbf7SKevin Wolf return ret; 754a35e1c17SKevin Wolf } 755a35e1c17SKevin Wolf 756f214978aSKevin Wolf /* There are no dependent requests, but we need to remove our request 757f214978aSKevin Wolf * from the list of in-flight requests */ 75868d100e9SKevin Wolf run_dependent_requests(bs->opaque, &meta); 759f214978aSKevin Wolf 760a35e1c17SKevin Wolf /* TODO Preallocate data if requested */ 761a35e1c17SKevin Wolf 762a35e1c17SKevin Wolf nb_sectors -= num; 763a35e1c17SKevin Wolf offset += num << 9; 764a35e1c17SKevin Wolf } 765a35e1c17SKevin Wolf 766a35e1c17SKevin Wolf /* 767a35e1c17SKevin Wolf * It is expected that the image file is large enough to actually contain 768a35e1c17SKevin Wolf * all of the allocated clusters (otherwise we get failing reads after 769a35e1c17SKevin Wolf * EOF). Extend the image to the last allocated sector. 770a35e1c17SKevin Wolf */ 771148da7eaSKevin Wolf if (meta.cluster_offset != 0) { 772ea80b906SKevin Wolf uint8_t buf[512]; 773ea80b906SKevin Wolf memset(buf, 0, 512); 77419dbcbf7SKevin Wolf ret = bdrv_write(bs->file, (meta.cluster_offset >> 9) + num - 1, buf, 1); 77519dbcbf7SKevin Wolf if (ret < 0) { 77619dbcbf7SKevin Wolf return ret; 77719dbcbf7SKevin Wolf } 778a35e1c17SKevin Wolf } 779a35e1c17SKevin Wolf 780a35e1c17SKevin Wolf return 0; 781a35e1c17SKevin Wolf } 782a35e1c17SKevin Wolf 7837c80ab3fSJes Sorensen static int qcow2_create2(const char *filename, int64_t total_size, 784a9420734SKevin Wolf const char *backing_file, const char *backing_format, 785a9420734SKevin Wolf int flags, size_t cluster_size, int prealloc, 786a9420734SKevin Wolf QEMUOptionParameter *options) 787a9420734SKevin Wolf { 788a9420734SKevin Wolf /* Calulate cluster_bits */ 789a9420734SKevin Wolf int cluster_bits; 790a9420734SKevin Wolf cluster_bits = ffs(cluster_size) - 1; 791a9420734SKevin Wolf if (cluster_bits < MIN_CLUSTER_BITS || cluster_bits > MAX_CLUSTER_BITS || 792a9420734SKevin Wolf (1 << cluster_bits) != cluster_size) 793a9420734SKevin Wolf { 794a9420734SKevin Wolf error_report( 7956daf194dSMarkus Armbruster "Cluster size must be a power of two between %d and %dk", 796a9420734SKevin Wolf 1 << MIN_CLUSTER_BITS, 1 << (MAX_CLUSTER_BITS - 10)); 797a9420734SKevin Wolf return -EINVAL; 798a9420734SKevin Wolf } 799a9420734SKevin Wolf 800a9420734SKevin Wolf /* 801a9420734SKevin Wolf * Open the image file and write a minimal qcow2 header. 802a9420734SKevin Wolf * 803a9420734SKevin Wolf * We keep things simple and start with a zero-sized image. We also 804a9420734SKevin Wolf * do without refcount blocks or a L1 table for now. We'll fix the 805a9420734SKevin Wolf * inconsistency later. 806a9420734SKevin Wolf * 807a9420734SKevin Wolf * We do need a refcount table because growing the refcount table means 808a9420734SKevin Wolf * allocating two new refcount blocks - the seconds of which would be at 809a9420734SKevin Wolf * 2 GB for 64k clusters, and we don't want to have a 2 GB initial file 810a9420734SKevin Wolf * size for any qcow2 image. 811a9420734SKevin Wolf */ 812a9420734SKevin Wolf BlockDriverState* bs; 813a9420734SKevin Wolf QCowHeader header; 814a9420734SKevin Wolf uint8_t* refcount_table; 815a9420734SKevin Wolf int ret; 816a9420734SKevin Wolf 817a9420734SKevin Wolf ret = bdrv_create_file(filename, options); 818a9420734SKevin Wolf if (ret < 0) { 819a9420734SKevin Wolf return ret; 820a9420734SKevin Wolf } 821a9420734SKevin Wolf 822a9420734SKevin Wolf ret = bdrv_file_open(&bs, filename, BDRV_O_RDWR); 823a9420734SKevin Wolf if (ret < 0) { 824a9420734SKevin Wolf return ret; 825a9420734SKevin Wolf } 826a9420734SKevin Wolf 827a9420734SKevin Wolf /* Write the header */ 828a9420734SKevin Wolf memset(&header, 0, sizeof(header)); 829a9420734SKevin Wolf header.magic = cpu_to_be32(QCOW_MAGIC); 830a9420734SKevin Wolf header.version = cpu_to_be32(QCOW_VERSION); 831a9420734SKevin Wolf header.cluster_bits = cpu_to_be32(cluster_bits); 832a9420734SKevin Wolf header.size = cpu_to_be64(0); 833a9420734SKevin Wolf header.l1_table_offset = cpu_to_be64(0); 834a9420734SKevin Wolf header.l1_size = cpu_to_be32(0); 835a9420734SKevin Wolf header.refcount_table_offset = cpu_to_be64(cluster_size); 836a9420734SKevin Wolf header.refcount_table_clusters = cpu_to_be32(1); 837a9420734SKevin Wolf 838a9420734SKevin Wolf if (flags & BLOCK_FLAG_ENCRYPT) { 839a9420734SKevin Wolf header.crypt_method = cpu_to_be32(QCOW_CRYPT_AES); 840a9420734SKevin Wolf } else { 841a9420734SKevin Wolf header.crypt_method = cpu_to_be32(QCOW_CRYPT_NONE); 842a9420734SKevin Wolf } 843a9420734SKevin Wolf 844a9420734SKevin Wolf ret = bdrv_pwrite(bs, 0, &header, sizeof(header)); 845a9420734SKevin Wolf if (ret < 0) { 846a9420734SKevin Wolf goto out; 847a9420734SKevin Wolf } 848a9420734SKevin Wolf 849a9420734SKevin Wolf /* Write an empty refcount table */ 8507267c094SAnthony Liguori refcount_table = g_malloc0(cluster_size); 851a9420734SKevin Wolf ret = bdrv_pwrite(bs, cluster_size, refcount_table, cluster_size); 8527267c094SAnthony Liguori g_free(refcount_table); 853a9420734SKevin Wolf 854a9420734SKevin Wolf if (ret < 0) { 855a9420734SKevin Wolf goto out; 856a9420734SKevin Wolf } 857a9420734SKevin Wolf 858a9420734SKevin Wolf bdrv_close(bs); 859a9420734SKevin Wolf 860a9420734SKevin Wolf /* 861a9420734SKevin Wolf * And now open the image and make it consistent first (i.e. increase the 862a9420734SKevin Wolf * refcount of the cluster that is occupied by the header and the refcount 863a9420734SKevin Wolf * table) 864a9420734SKevin Wolf */ 865a9420734SKevin Wolf BlockDriver* drv = bdrv_find_format("qcow2"); 866a9420734SKevin Wolf assert(drv != NULL); 867e1a7107fSKevin Wolf ret = bdrv_open(bs, filename, 868e1a7107fSKevin Wolf BDRV_O_RDWR | BDRV_O_CACHE_WB | BDRV_O_NO_FLUSH, drv); 869a9420734SKevin Wolf if (ret < 0) { 870a9420734SKevin Wolf goto out; 871a9420734SKevin Wolf } 872a9420734SKevin Wolf 873a9420734SKevin Wolf ret = qcow2_alloc_clusters(bs, 2 * cluster_size); 874a9420734SKevin Wolf if (ret < 0) { 875a9420734SKevin Wolf goto out; 876a9420734SKevin Wolf 877a9420734SKevin Wolf } else if (ret != 0) { 878a9420734SKevin Wolf error_report("Huh, first cluster in empty image is already in use?"); 879a9420734SKevin Wolf abort(); 880a9420734SKevin Wolf } 881a9420734SKevin Wolf 882a9420734SKevin Wolf /* Okay, now that we have a valid image, let's give it the right size */ 883a9420734SKevin Wolf ret = bdrv_truncate(bs, total_size * BDRV_SECTOR_SIZE); 884a9420734SKevin Wolf if (ret < 0) { 885a9420734SKevin Wolf goto out; 886a9420734SKevin Wolf } 887a9420734SKevin Wolf 888a9420734SKevin Wolf /* Want a backing file? There you go.*/ 889a9420734SKevin Wolf if (backing_file) { 890a9420734SKevin Wolf ret = bdrv_change_backing_file(bs, backing_file, backing_format); 891a9420734SKevin Wolf if (ret < 0) { 892a9420734SKevin Wolf goto out; 893a9420734SKevin Wolf } 894a9420734SKevin Wolf } 895a9420734SKevin Wolf 896a9420734SKevin Wolf /* And if we're supposed to preallocate metadata, do that now */ 897a9420734SKevin Wolf if (prealloc) { 898a9420734SKevin Wolf ret = preallocate(bs); 899a9420734SKevin Wolf if (ret < 0) { 900a9420734SKevin Wolf goto out; 901a9420734SKevin Wolf } 902a9420734SKevin Wolf } 903a9420734SKevin Wolf 904a9420734SKevin Wolf ret = 0; 905a9420734SKevin Wolf out: 906a9420734SKevin Wolf bdrv_delete(bs); 907a9420734SKevin Wolf return ret; 908a9420734SKevin Wolf } 909de5f3f40SKevin Wolf 9107c80ab3fSJes Sorensen static int qcow2_create(const char *filename, QEMUOptionParameter *options) 911de5f3f40SKevin Wolf { 912de5f3f40SKevin Wolf const char *backing_file = NULL; 913de5f3f40SKevin Wolf const char *backing_fmt = NULL; 914de5f3f40SKevin Wolf uint64_t sectors = 0; 915de5f3f40SKevin Wolf int flags = 0; 91699cce9faSKevin Wolf size_t cluster_size = DEFAULT_CLUSTER_SIZE; 917de5f3f40SKevin Wolf int prealloc = 0; 918de5f3f40SKevin Wolf 919de5f3f40SKevin Wolf /* Read out options */ 920de5f3f40SKevin Wolf while (options && options->name) { 921de5f3f40SKevin Wolf if (!strcmp(options->name, BLOCK_OPT_SIZE)) { 922de5f3f40SKevin Wolf sectors = options->value.n / 512; 923de5f3f40SKevin Wolf } else if (!strcmp(options->name, BLOCK_OPT_BACKING_FILE)) { 924de5f3f40SKevin Wolf backing_file = options->value.s; 925de5f3f40SKevin Wolf } else if (!strcmp(options->name, BLOCK_OPT_BACKING_FMT)) { 926de5f3f40SKevin Wolf backing_fmt = options->value.s; 927de5f3f40SKevin Wolf } else if (!strcmp(options->name, BLOCK_OPT_ENCRYPT)) { 928de5f3f40SKevin Wolf flags |= options->value.n ? BLOCK_FLAG_ENCRYPT : 0; 929de5f3f40SKevin Wolf } else if (!strcmp(options->name, BLOCK_OPT_CLUSTER_SIZE)) { 930de5f3f40SKevin Wolf if (options->value.n) { 931de5f3f40SKevin Wolf cluster_size = options->value.n; 932de5f3f40SKevin Wolf } 933de5f3f40SKevin Wolf } else if (!strcmp(options->name, BLOCK_OPT_PREALLOC)) { 934de5f3f40SKevin Wolf if (!options->value.s || !strcmp(options->value.s, "off")) { 935de5f3f40SKevin Wolf prealloc = 0; 936de5f3f40SKevin Wolf } else if (!strcmp(options->value.s, "metadata")) { 937de5f3f40SKevin Wolf prealloc = 1; 938de5f3f40SKevin Wolf } else { 939de5f3f40SKevin Wolf fprintf(stderr, "Invalid preallocation mode: '%s'\n", 940de5f3f40SKevin Wolf options->value.s); 941de5f3f40SKevin Wolf return -EINVAL; 942de5f3f40SKevin Wolf } 943de5f3f40SKevin Wolf } 944de5f3f40SKevin Wolf options++; 945de5f3f40SKevin Wolf } 946de5f3f40SKevin Wolf 947de5f3f40SKevin Wolf if (backing_file && prealloc) { 948de5f3f40SKevin Wolf fprintf(stderr, "Backing file and preallocation cannot be used at " 949de5f3f40SKevin Wolf "the same time\n"); 950de5f3f40SKevin Wolf return -EINVAL; 951de5f3f40SKevin Wolf } 952de5f3f40SKevin Wolf 9537c80ab3fSJes Sorensen return qcow2_create2(filename, sectors, backing_file, backing_fmt, flags, 954a9420734SKevin Wolf cluster_size, prealloc, options); 955de5f3f40SKevin Wolf } 956de5f3f40SKevin Wolf 9577c80ab3fSJes Sorensen static int qcow2_make_empty(BlockDriverState *bs) 95820d97356SBlue Swirl { 95920d97356SBlue Swirl #if 0 96020d97356SBlue Swirl /* XXX: not correct */ 96120d97356SBlue Swirl BDRVQcowState *s = bs->opaque; 96220d97356SBlue Swirl uint32_t l1_length = s->l1_size * sizeof(uint64_t); 96320d97356SBlue Swirl int ret; 96420d97356SBlue Swirl 96520d97356SBlue Swirl memset(s->l1_table, 0, l1_length); 96666f82ceeSKevin Wolf if (bdrv_pwrite(bs->file, s->l1_table_offset, s->l1_table, l1_length) < 0) 96720d97356SBlue Swirl return -1; 96866f82ceeSKevin Wolf ret = bdrv_truncate(bs->file, s->l1_table_offset + l1_length); 96920d97356SBlue Swirl if (ret < 0) 97020d97356SBlue Swirl return ret; 97120d97356SBlue Swirl 97220d97356SBlue Swirl l2_cache_reset(bs); 97320d97356SBlue Swirl #endif 97420d97356SBlue Swirl return 0; 97520d97356SBlue Swirl } 97620d97356SBlue Swirl 9775ea929e3SKevin Wolf static int qcow2_discard(BlockDriverState *bs, int64_t sector_num, 9785ea929e3SKevin Wolf int nb_sectors) 9795ea929e3SKevin Wolf { 9805ea929e3SKevin Wolf return qcow2_discard_clusters(bs, sector_num << BDRV_SECTOR_BITS, 9815ea929e3SKevin Wolf nb_sectors); 9825ea929e3SKevin Wolf } 9835ea929e3SKevin Wolf 984419b19d9SStefan Hajnoczi static int qcow2_truncate(BlockDriverState *bs, int64_t offset) 985419b19d9SStefan Hajnoczi { 986419b19d9SStefan Hajnoczi BDRVQcowState *s = bs->opaque; 987419b19d9SStefan Hajnoczi int ret, new_l1_size; 988419b19d9SStefan Hajnoczi 989419b19d9SStefan Hajnoczi if (offset & 511) { 990419b19d9SStefan Hajnoczi return -EINVAL; 991419b19d9SStefan Hajnoczi } 992419b19d9SStefan Hajnoczi 993419b19d9SStefan Hajnoczi /* cannot proceed if image has snapshots */ 994419b19d9SStefan Hajnoczi if (s->nb_snapshots) { 995419b19d9SStefan Hajnoczi return -ENOTSUP; 996419b19d9SStefan Hajnoczi } 997419b19d9SStefan Hajnoczi 998419b19d9SStefan Hajnoczi /* shrinking is currently not supported */ 999419b19d9SStefan Hajnoczi if (offset < bs->total_sectors * 512) { 1000419b19d9SStefan Hajnoczi return -ENOTSUP; 1001419b19d9SStefan Hajnoczi } 1002419b19d9SStefan Hajnoczi 1003419b19d9SStefan Hajnoczi new_l1_size = size_to_l1(s, offset); 100472893756SStefan Hajnoczi ret = qcow2_grow_l1_table(bs, new_l1_size, true); 1005419b19d9SStefan Hajnoczi if (ret < 0) { 1006419b19d9SStefan Hajnoczi return ret; 1007419b19d9SStefan Hajnoczi } 1008419b19d9SStefan Hajnoczi 1009419b19d9SStefan Hajnoczi /* write updated header.size */ 1010419b19d9SStefan Hajnoczi offset = cpu_to_be64(offset); 10118b3b7206SKevin Wolf ret = bdrv_pwrite_sync(bs->file, offsetof(QCowHeader, size), 1012419b19d9SStefan Hajnoczi &offset, sizeof(uint64_t)); 1013419b19d9SStefan Hajnoczi if (ret < 0) { 1014419b19d9SStefan Hajnoczi return ret; 1015419b19d9SStefan Hajnoczi } 1016419b19d9SStefan Hajnoczi 1017419b19d9SStefan Hajnoczi s->l1_vm_state_index = new_l1_size; 1018419b19d9SStefan Hajnoczi return 0; 1019419b19d9SStefan Hajnoczi } 1020419b19d9SStefan Hajnoczi 102120d97356SBlue Swirl /* XXX: put compressed sectors first, then all the cluster aligned 102220d97356SBlue Swirl tables to avoid losing bytes in alignment */ 10237c80ab3fSJes Sorensen static int qcow2_write_compressed(BlockDriverState *bs, int64_t sector_num, 102420d97356SBlue Swirl const uint8_t *buf, int nb_sectors) 102520d97356SBlue Swirl { 102620d97356SBlue Swirl BDRVQcowState *s = bs->opaque; 102720d97356SBlue Swirl z_stream strm; 102820d97356SBlue Swirl int ret, out_len; 102920d97356SBlue Swirl uint8_t *out_buf; 103020d97356SBlue Swirl uint64_t cluster_offset; 103120d97356SBlue Swirl 103220d97356SBlue Swirl if (nb_sectors == 0) { 103320d97356SBlue Swirl /* align end of file to a sector boundary to ease reading with 103420d97356SBlue Swirl sector based I/Os */ 103566f82ceeSKevin Wolf cluster_offset = bdrv_getlength(bs->file); 103620d97356SBlue Swirl cluster_offset = (cluster_offset + 511) & ~511; 103766f82ceeSKevin Wolf bdrv_truncate(bs->file, cluster_offset); 103820d97356SBlue Swirl return 0; 103920d97356SBlue Swirl } 104020d97356SBlue Swirl 104120d97356SBlue Swirl if (nb_sectors != s->cluster_sectors) 104220d97356SBlue Swirl return -EINVAL; 104320d97356SBlue Swirl 10447267c094SAnthony Liguori out_buf = g_malloc(s->cluster_size + (s->cluster_size / 1000) + 128); 104520d97356SBlue Swirl 104620d97356SBlue Swirl /* best compression, small window, no zlib header */ 104720d97356SBlue Swirl memset(&strm, 0, sizeof(strm)); 104820d97356SBlue Swirl ret = deflateInit2(&strm, Z_DEFAULT_COMPRESSION, 104920d97356SBlue Swirl Z_DEFLATED, -12, 105020d97356SBlue Swirl 9, Z_DEFAULT_STRATEGY); 105120d97356SBlue Swirl if (ret != 0) { 10527267c094SAnthony Liguori g_free(out_buf); 105320d97356SBlue Swirl return -1; 105420d97356SBlue Swirl } 105520d97356SBlue Swirl 105620d97356SBlue Swirl strm.avail_in = s->cluster_size; 105720d97356SBlue Swirl strm.next_in = (uint8_t *)buf; 105820d97356SBlue Swirl strm.avail_out = s->cluster_size; 105920d97356SBlue Swirl strm.next_out = out_buf; 106020d97356SBlue Swirl 106120d97356SBlue Swirl ret = deflate(&strm, Z_FINISH); 106220d97356SBlue Swirl if (ret != Z_STREAM_END && ret != Z_OK) { 10637267c094SAnthony Liguori g_free(out_buf); 106420d97356SBlue Swirl deflateEnd(&strm); 106520d97356SBlue Swirl return -1; 106620d97356SBlue Swirl } 106720d97356SBlue Swirl out_len = strm.next_out - out_buf; 106820d97356SBlue Swirl 106920d97356SBlue Swirl deflateEnd(&strm); 107020d97356SBlue Swirl 107120d97356SBlue Swirl if (ret != Z_STREAM_END || out_len >= s->cluster_size) { 107220d97356SBlue Swirl /* could not compress: write normal cluster */ 107320d97356SBlue Swirl bdrv_write(bs, sector_num, buf, s->cluster_sectors); 107420d97356SBlue Swirl } else { 107520d97356SBlue Swirl cluster_offset = qcow2_alloc_compressed_cluster_offset(bs, 107620d97356SBlue Swirl sector_num << 9, out_len); 107720d97356SBlue Swirl if (!cluster_offset) 107820d97356SBlue Swirl return -1; 107920d97356SBlue Swirl cluster_offset &= s->cluster_offset_mask; 108066f82ceeSKevin Wolf BLKDBG_EVENT(bs->file, BLKDBG_WRITE_COMPRESSED); 108166f82ceeSKevin Wolf if (bdrv_pwrite(bs->file, cluster_offset, out_buf, out_len) != out_len) { 10827267c094SAnthony Liguori g_free(out_buf); 108320d97356SBlue Swirl return -1; 108420d97356SBlue Swirl } 108520d97356SBlue Swirl } 108620d97356SBlue Swirl 10877267c094SAnthony Liguori g_free(out_buf); 108820d97356SBlue Swirl return 0; 108920d97356SBlue Swirl } 109020d97356SBlue Swirl 10917c80ab3fSJes Sorensen static int qcow2_flush(BlockDriverState *bs) 109220d97356SBlue Swirl { 109329c1a730SKevin Wolf BDRVQcowState *s = bs->opaque; 109429c1a730SKevin Wolf int ret; 109529c1a730SKevin Wolf 109629c1a730SKevin Wolf ret = qcow2_cache_flush(bs, s->l2_table_cache); 109729c1a730SKevin Wolf if (ret < 0) { 109829c1a730SKevin Wolf return ret; 109929c1a730SKevin Wolf } 110029c1a730SKevin Wolf 110129c1a730SKevin Wolf ret = qcow2_cache_flush(bs, s->refcount_block_cache); 110229c1a730SKevin Wolf if (ret < 0) { 110329c1a730SKevin Wolf return ret; 110429c1a730SKevin Wolf } 110529c1a730SKevin Wolf 1106205ef796SKevin Wolf return bdrv_flush(bs->file); 110720d97356SBlue Swirl } 110820d97356SBlue Swirl 11097c80ab3fSJes Sorensen static BlockDriverAIOCB *qcow2_aio_flush(BlockDriverState *bs, 11107c80ab3fSJes Sorensen BlockDriverCompletionFunc *cb, 11117c80ab3fSJes Sorensen void *opaque) 111220d97356SBlue Swirl { 111329c1a730SKevin Wolf BDRVQcowState *s = bs->opaque; 111429c1a730SKevin Wolf int ret; 111529c1a730SKevin Wolf 111629c1a730SKevin Wolf ret = qcow2_cache_flush(bs, s->l2_table_cache); 111729c1a730SKevin Wolf if (ret < 0) { 111829c1a730SKevin Wolf return NULL; 111929c1a730SKevin Wolf } 112029c1a730SKevin Wolf 112129c1a730SKevin Wolf ret = qcow2_cache_flush(bs, s->refcount_block_cache); 112229c1a730SKevin Wolf if (ret < 0) { 112329c1a730SKevin Wolf return NULL; 112429c1a730SKevin Wolf } 112529c1a730SKevin Wolf 112666f82ceeSKevin Wolf return bdrv_aio_flush(bs->file, cb, opaque); 112720d97356SBlue Swirl } 112820d97356SBlue Swirl 11297c80ab3fSJes Sorensen static int64_t qcow2_vm_state_offset(BDRVQcowState *s) 113020d97356SBlue Swirl { 113120d97356SBlue Swirl return (int64_t)s->l1_vm_state_index << (s->cluster_bits + s->l2_bits); 113220d97356SBlue Swirl } 113320d97356SBlue Swirl 11347c80ab3fSJes Sorensen static int qcow2_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) 113520d97356SBlue Swirl { 113620d97356SBlue Swirl BDRVQcowState *s = bs->opaque; 113720d97356SBlue Swirl bdi->cluster_size = s->cluster_size; 11387c80ab3fSJes Sorensen bdi->vm_state_offset = qcow2_vm_state_offset(s); 113920d97356SBlue Swirl return 0; 114020d97356SBlue Swirl } 114120d97356SBlue Swirl 114220d97356SBlue Swirl 11437c80ab3fSJes Sorensen static int qcow2_check(BlockDriverState *bs, BdrvCheckResult *result) 114420d97356SBlue Swirl { 11459ac228e0SKevin Wolf return qcow2_check_refcounts(bs, result); 114620d97356SBlue Swirl } 114720d97356SBlue Swirl 114820d97356SBlue Swirl #if 0 114920d97356SBlue Swirl static void dump_refcounts(BlockDriverState *bs) 115020d97356SBlue Swirl { 115120d97356SBlue Swirl BDRVQcowState *s = bs->opaque; 115220d97356SBlue Swirl int64_t nb_clusters, k, k1, size; 115320d97356SBlue Swirl int refcount; 115420d97356SBlue Swirl 115566f82ceeSKevin Wolf size = bdrv_getlength(bs->file); 115620d97356SBlue Swirl nb_clusters = size_to_clusters(s, size); 115720d97356SBlue Swirl for(k = 0; k < nb_clusters;) { 115820d97356SBlue Swirl k1 = k; 115920d97356SBlue Swirl refcount = get_refcount(bs, k); 116020d97356SBlue Swirl k++; 116120d97356SBlue Swirl while (k < nb_clusters && get_refcount(bs, k) == refcount) 116220d97356SBlue Swirl k++; 11630bfcd599SBlue Swirl printf("%" PRId64 ": refcount=%d nb=%" PRId64 "\n", k, refcount, 11640bfcd599SBlue Swirl k - k1); 116520d97356SBlue Swirl } 116620d97356SBlue Swirl } 116720d97356SBlue Swirl #endif 116820d97356SBlue Swirl 11697c80ab3fSJes Sorensen static int qcow2_save_vmstate(BlockDriverState *bs, const uint8_t *buf, 117020d97356SBlue Swirl int64_t pos, int size) 117120d97356SBlue Swirl { 117220d97356SBlue Swirl BDRVQcowState *s = bs->opaque; 117320d97356SBlue Swirl int growable = bs->growable; 117420d97356SBlue Swirl int ret; 117520d97356SBlue Swirl 117666f82ceeSKevin Wolf BLKDBG_EVENT(bs->file, BLKDBG_VMSTATE_SAVE); 117720d97356SBlue Swirl bs->growable = 1; 11787c80ab3fSJes Sorensen ret = bdrv_pwrite(bs, qcow2_vm_state_offset(s) + pos, buf, size); 117920d97356SBlue Swirl bs->growable = growable; 118020d97356SBlue Swirl 118120d97356SBlue Swirl return ret; 118220d97356SBlue Swirl } 118320d97356SBlue Swirl 11847c80ab3fSJes Sorensen static int qcow2_load_vmstate(BlockDriverState *bs, uint8_t *buf, 118520d97356SBlue Swirl int64_t pos, int size) 118620d97356SBlue Swirl { 118720d97356SBlue Swirl BDRVQcowState *s = bs->opaque; 118820d97356SBlue Swirl int growable = bs->growable; 118920d97356SBlue Swirl int ret; 119020d97356SBlue Swirl 119166f82ceeSKevin Wolf BLKDBG_EVENT(bs->file, BLKDBG_VMSTATE_LOAD); 119220d97356SBlue Swirl bs->growable = 1; 11937c80ab3fSJes Sorensen ret = bdrv_pread(bs, qcow2_vm_state_offset(s) + pos, buf, size); 119420d97356SBlue Swirl bs->growable = growable; 119520d97356SBlue Swirl 119620d97356SBlue Swirl return ret; 119720d97356SBlue Swirl } 119820d97356SBlue Swirl 11997c80ab3fSJes Sorensen static QEMUOptionParameter qcow2_create_options[] = { 120020d97356SBlue Swirl { 120120d97356SBlue Swirl .name = BLOCK_OPT_SIZE, 120220d97356SBlue Swirl .type = OPT_SIZE, 120320d97356SBlue Swirl .help = "Virtual disk size" 120420d97356SBlue Swirl }, 120520d97356SBlue Swirl { 120620d97356SBlue Swirl .name = BLOCK_OPT_BACKING_FILE, 120720d97356SBlue Swirl .type = OPT_STRING, 120820d97356SBlue Swirl .help = "File name of a base image" 120920d97356SBlue Swirl }, 121020d97356SBlue Swirl { 121120d97356SBlue Swirl .name = BLOCK_OPT_BACKING_FMT, 121220d97356SBlue Swirl .type = OPT_STRING, 121320d97356SBlue Swirl .help = "Image format of the base image" 121420d97356SBlue Swirl }, 121520d97356SBlue Swirl { 121620d97356SBlue Swirl .name = BLOCK_OPT_ENCRYPT, 121720d97356SBlue Swirl .type = OPT_FLAG, 121820d97356SBlue Swirl .help = "Encrypt the image" 121920d97356SBlue Swirl }, 122020d97356SBlue Swirl { 122120d97356SBlue Swirl .name = BLOCK_OPT_CLUSTER_SIZE, 122220d97356SBlue Swirl .type = OPT_SIZE, 122399cce9faSKevin Wolf .help = "qcow2 cluster size", 122499cce9faSKevin Wolf .value = { .n = DEFAULT_CLUSTER_SIZE }, 122520d97356SBlue Swirl }, 122620d97356SBlue Swirl { 122720d97356SBlue Swirl .name = BLOCK_OPT_PREALLOC, 122820d97356SBlue Swirl .type = OPT_STRING, 122920d97356SBlue Swirl .help = "Preallocation mode (allowed values: off, metadata)" 123020d97356SBlue Swirl }, 123120d97356SBlue Swirl { NULL } 123220d97356SBlue Swirl }; 123320d97356SBlue Swirl 123420d97356SBlue Swirl static BlockDriver bdrv_qcow2 = { 123520d97356SBlue Swirl .format_name = "qcow2", 123620d97356SBlue Swirl .instance_size = sizeof(BDRVQcowState), 12377c80ab3fSJes Sorensen .bdrv_probe = qcow2_probe, 12387c80ab3fSJes Sorensen .bdrv_open = qcow2_open, 12397c80ab3fSJes Sorensen .bdrv_close = qcow2_close, 12407c80ab3fSJes Sorensen .bdrv_create = qcow2_create, 12417c80ab3fSJes Sorensen .bdrv_flush = qcow2_flush, 12427c80ab3fSJes Sorensen .bdrv_is_allocated = qcow2_is_allocated, 12437c80ab3fSJes Sorensen .bdrv_set_key = qcow2_set_key, 12447c80ab3fSJes Sorensen .bdrv_make_empty = qcow2_make_empty, 124520d97356SBlue Swirl 124668d100e9SKevin Wolf .bdrv_co_readv = qcow2_co_readv, 124768d100e9SKevin Wolf .bdrv_co_writev = qcow2_co_writev, 12487c80ab3fSJes Sorensen .bdrv_aio_flush = qcow2_aio_flush, 1249419b19d9SStefan Hajnoczi 12505ea929e3SKevin Wolf .bdrv_discard = qcow2_discard, 1251419b19d9SStefan Hajnoczi .bdrv_truncate = qcow2_truncate, 12527c80ab3fSJes Sorensen .bdrv_write_compressed = qcow2_write_compressed, 125320d97356SBlue Swirl 125420d97356SBlue Swirl .bdrv_snapshot_create = qcow2_snapshot_create, 125520d97356SBlue Swirl .bdrv_snapshot_goto = qcow2_snapshot_goto, 125620d97356SBlue Swirl .bdrv_snapshot_delete = qcow2_snapshot_delete, 125720d97356SBlue Swirl .bdrv_snapshot_list = qcow2_snapshot_list, 125851ef6727Sedison .bdrv_snapshot_load_tmp = qcow2_snapshot_load_tmp, 12597c80ab3fSJes Sorensen .bdrv_get_info = qcow2_get_info, 126020d97356SBlue Swirl 12617c80ab3fSJes Sorensen .bdrv_save_vmstate = qcow2_save_vmstate, 12627c80ab3fSJes Sorensen .bdrv_load_vmstate = qcow2_load_vmstate, 126320d97356SBlue Swirl 126420d97356SBlue Swirl .bdrv_change_backing_file = qcow2_change_backing_file, 126520d97356SBlue Swirl 12667c80ab3fSJes Sorensen .create_options = qcow2_create_options, 12677c80ab3fSJes Sorensen .bdrv_check = qcow2_check, 126820d97356SBlue Swirl }; 126920d97356SBlue Swirl 12705efa9d5aSAnthony Liguori static void bdrv_qcow2_init(void) 12715efa9d5aSAnthony Liguori { 12725efa9d5aSAnthony Liguori bdrv_register(&bdrv_qcow2); 12735efa9d5aSAnthony Liguori } 12745efa9d5aSAnthony Liguori 12755efa9d5aSAnthony Liguori block_init(bdrv_qcow2_init); 1276