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 */ 240dea43a65SFrediano Ziglio s->cluster_data = qemu_blockalign(bs, QCOW_MAX_CRYPT_CLUSTERS * s->cluster_size 241095a9c58Saliguori + 512); 242585f8587Sbellard s->cluster_cache_offset = -1; 243*06d9260fSAnthony Liguori s->flags = flags; 244585f8587Sbellard 2456d85a57eSJes Sorensen ret = qcow2_refcount_init(bs); 2466d85a57eSJes Sorensen if (ret != 0) { 247585f8587Sbellard goto fail; 2486d85a57eSJes Sorensen } 249585f8587Sbellard 25072cf2d4fSBlue Swirl QLIST_INIT(&s->cluster_allocs); 251f214978aSKevin Wolf 2529b80ddf3Saliguori /* read qcow2 extensions */ 2536d85a57eSJes Sorensen if (header.backing_file_offset) { 2549b80ddf3Saliguori ext_end = header.backing_file_offset; 2556d85a57eSJes Sorensen } else { 2569b80ddf3Saliguori ext_end = s->cluster_size; 2576d85a57eSJes Sorensen } 2586d85a57eSJes Sorensen if (qcow2_read_extensions(bs, sizeof(header), ext_end)) { 2596d85a57eSJes Sorensen ret = -EINVAL; 2609b80ddf3Saliguori goto fail; 2616d85a57eSJes Sorensen } 2629b80ddf3Saliguori 263585f8587Sbellard /* read the backing file name */ 264585f8587Sbellard if (header.backing_file_offset != 0) { 265585f8587Sbellard len = header.backing_file_size; 2666d85a57eSJes Sorensen if (len > 1023) { 267585f8587Sbellard len = 1023; 2686d85a57eSJes Sorensen } 2696d85a57eSJes Sorensen ret = bdrv_pread(bs->file, header.backing_file_offset, 2706d85a57eSJes Sorensen bs->backing_file, len); 2716d85a57eSJes Sorensen if (ret < 0) { 272585f8587Sbellard goto fail; 2736d85a57eSJes Sorensen } 274585f8587Sbellard bs->backing_file[len] = '\0'; 275585f8587Sbellard } 2766d85a57eSJes Sorensen if (qcow2_read_snapshots(bs) < 0) { 2776d85a57eSJes Sorensen ret = -EINVAL; 278585f8587Sbellard goto fail; 2796d85a57eSJes Sorensen } 280585f8587Sbellard 28168d100e9SKevin Wolf /* Initialise locks */ 28268d100e9SKevin Wolf qemu_co_mutex_init(&s->lock); 28368d100e9SKevin Wolf 284585f8587Sbellard #ifdef DEBUG_ALLOC 2856cbc3031SPhilipp Hahn { 2866cbc3031SPhilipp Hahn BdrvCheckResult result = {0}; 2876cbc3031SPhilipp Hahn qcow2_check_refcounts(bs, &result); 2886cbc3031SPhilipp Hahn } 289585f8587Sbellard #endif 2906d85a57eSJes Sorensen return ret; 291585f8587Sbellard 292585f8587Sbellard fail: 293ed6ccf0fSKevin Wolf qcow2_free_snapshots(bs); 294ed6ccf0fSKevin Wolf qcow2_refcount_close(bs); 2957267c094SAnthony Liguori g_free(s->l1_table); 29629c1a730SKevin Wolf if (s->l2_table_cache) { 29729c1a730SKevin Wolf qcow2_cache_destroy(bs, s->l2_table_cache); 29829c1a730SKevin Wolf } 2997267c094SAnthony Liguori g_free(s->cluster_cache); 300dea43a65SFrediano Ziglio qemu_vfree(s->cluster_data); 3016d85a57eSJes Sorensen return ret; 302585f8587Sbellard } 303585f8587Sbellard 3047c80ab3fSJes Sorensen static int qcow2_set_key(BlockDriverState *bs, const char *key) 305585f8587Sbellard { 306585f8587Sbellard BDRVQcowState *s = bs->opaque; 307585f8587Sbellard uint8_t keybuf[16]; 308585f8587Sbellard int len, i; 309585f8587Sbellard 310585f8587Sbellard memset(keybuf, 0, 16); 311585f8587Sbellard len = strlen(key); 312585f8587Sbellard if (len > 16) 313585f8587Sbellard len = 16; 314585f8587Sbellard /* XXX: we could compress the chars to 7 bits to increase 315585f8587Sbellard entropy */ 316585f8587Sbellard for(i = 0;i < len;i++) { 317585f8587Sbellard keybuf[i] = key[i]; 318585f8587Sbellard } 319585f8587Sbellard s->crypt_method = s->crypt_method_header; 320585f8587Sbellard 321585f8587Sbellard if (AES_set_encrypt_key(keybuf, 128, &s->aes_encrypt_key) != 0) 322585f8587Sbellard return -1; 323585f8587Sbellard if (AES_set_decrypt_key(keybuf, 128, &s->aes_decrypt_key) != 0) 324585f8587Sbellard return -1; 325585f8587Sbellard #if 0 326585f8587Sbellard /* test */ 327585f8587Sbellard { 328585f8587Sbellard uint8_t in[16]; 329585f8587Sbellard uint8_t out[16]; 330585f8587Sbellard uint8_t tmp[16]; 331585f8587Sbellard for(i=0;i<16;i++) 332585f8587Sbellard in[i] = i; 333585f8587Sbellard AES_encrypt(in, tmp, &s->aes_encrypt_key); 334585f8587Sbellard AES_decrypt(tmp, out, &s->aes_decrypt_key); 335585f8587Sbellard for(i = 0; i < 16; i++) 336585f8587Sbellard printf(" %02x", tmp[i]); 337585f8587Sbellard printf("\n"); 338585f8587Sbellard for(i = 0; i < 16; i++) 339585f8587Sbellard printf(" %02x", out[i]); 340585f8587Sbellard printf("\n"); 341585f8587Sbellard } 342585f8587Sbellard #endif 343585f8587Sbellard return 0; 344585f8587Sbellard } 345585f8587Sbellard 3467c80ab3fSJes Sorensen static int qcow2_is_allocated(BlockDriverState *bs, int64_t sector_num, 347585f8587Sbellard int nb_sectors, int *pnum) 348585f8587Sbellard { 349585f8587Sbellard uint64_t cluster_offset; 3501c46efaaSKevin Wolf int ret; 351585f8587Sbellard 352095a9c58Saliguori *pnum = nb_sectors; 3531c46efaaSKevin Wolf /* FIXME We can get errors here, but the bdrv_is_allocated interface can't 3541c46efaaSKevin Wolf * pass them on today */ 3551c46efaaSKevin Wolf ret = qcow2_get_cluster_offset(bs, sector_num << 9, pnum, &cluster_offset); 3561c46efaaSKevin Wolf if (ret < 0) { 3571c46efaaSKevin Wolf *pnum = 0; 3581c46efaaSKevin Wolf } 359095a9c58Saliguori 360585f8587Sbellard return (cluster_offset != 0); 361585f8587Sbellard } 362585f8587Sbellard 363a9465922Sbellard /* handle reading after the end of the backing file */ 364bd28f835SKevin Wolf int qcow2_backing_read1(BlockDriverState *bs, QEMUIOVector *qiov, 365bd28f835SKevin Wolf int64_t sector_num, int nb_sectors) 366a9465922Sbellard { 367a9465922Sbellard int n1; 368a9465922Sbellard if ((sector_num + nb_sectors) <= bs->total_sectors) 369a9465922Sbellard return nb_sectors; 370a9465922Sbellard if (sector_num >= bs->total_sectors) 371a9465922Sbellard n1 = 0; 372a9465922Sbellard else 373a9465922Sbellard n1 = bs->total_sectors - sector_num; 374bd28f835SKevin Wolf 375e0d9c6f9SChunqiang Tang qemu_iovec_memset_skip(qiov, 0, 512 * (nb_sectors - n1), 512 * n1); 376bd28f835SKevin Wolf 377a9465922Sbellard return n1; 378a9465922Sbellard } 379a9465922Sbellard 3803fc48d09SFrediano Ziglio static int qcow2_co_readv(BlockDriverState *bs, int64_t sector_num, 3813fc48d09SFrediano Ziglio int remaining_sectors, QEMUIOVector *qiov) 3821490791fSaliguori { 383585f8587Sbellard BDRVQcowState *s = bs->opaque; 384a9465922Sbellard int index_in_cluster, n1; 38568d100e9SKevin Wolf int ret; 386faf575c1SFrediano Ziglio int cur_nr_sectors; /* number of sectors in current iteration */ 387c2bdd990SFrediano Ziglio uint64_t cluster_offset = 0; 3883fc48d09SFrediano Ziglio uint64_t bytes_done = 0; 3893fc48d09SFrediano Ziglio QEMUIOVector hd_qiov; 3903fc48d09SFrediano Ziglio uint8_t *cluster_data = NULL; 391585f8587Sbellard 3923fc48d09SFrediano Ziglio qemu_iovec_init(&hd_qiov, qiov->niov); 3933fc48d09SFrediano Ziglio 3943fc48d09SFrediano Ziglio qemu_co_mutex_lock(&s->lock); 3953fc48d09SFrediano Ziglio 3963fc48d09SFrediano Ziglio while (remaining_sectors != 0) { 397585f8587Sbellard 398faf575c1SFrediano Ziglio /* prepare next request */ 3993fc48d09SFrediano Ziglio cur_nr_sectors = remaining_sectors; 400bd28f835SKevin Wolf if (s->crypt_method) { 401faf575c1SFrediano Ziglio cur_nr_sectors = MIN(cur_nr_sectors, 402bd28f835SKevin Wolf QCOW_MAX_CRYPT_CLUSTERS * s->cluster_sectors); 403bd28f835SKevin Wolf } 404bd28f835SKevin Wolf 4053fc48d09SFrediano Ziglio ret = qcow2_get_cluster_offset(bs, sector_num << 9, 406c2bdd990SFrediano Ziglio &cur_nr_sectors, &cluster_offset); 4071c46efaaSKevin Wolf if (ret < 0) { 4083fc48d09SFrediano Ziglio goto fail; 4091c46efaaSKevin Wolf } 4101c46efaaSKevin Wolf 4113fc48d09SFrediano Ziglio index_in_cluster = sector_num & (s->cluster_sectors - 1); 412585f8587Sbellard 4133fc48d09SFrediano Ziglio qemu_iovec_reset(&hd_qiov); 4143fc48d09SFrediano Ziglio qemu_iovec_copy(&hd_qiov, qiov, bytes_done, 415faf575c1SFrediano Ziglio cur_nr_sectors * 512); 416bd28f835SKevin Wolf 417c2bdd990SFrediano Ziglio if (!cluster_offset) { 418bd28f835SKevin Wolf 419585f8587Sbellard if (bs->backing_hd) { 420585f8587Sbellard /* read from the base image */ 4213fc48d09SFrediano Ziglio n1 = qcow2_backing_read1(bs->backing_hd, &hd_qiov, 4223fc48d09SFrediano Ziglio sector_num, cur_nr_sectors); 423a9465922Sbellard if (n1 > 0) { 42466f82ceeSKevin Wolf BLKDBG_EVENT(bs->file, BLKDBG_READ_BACKING_AIO); 42568d100e9SKevin Wolf qemu_co_mutex_unlock(&s->lock); 4263fc48d09SFrediano Ziglio ret = bdrv_co_readv(bs->backing_hd, sector_num, 4273fc48d09SFrediano Ziglio n1, &hd_qiov); 42868d100e9SKevin Wolf qemu_co_mutex_lock(&s->lock); 42968d100e9SKevin Wolf if (ret < 0) { 4303fc48d09SFrediano Ziglio goto fail; 4313ab4c7e9SKevin Wolf } 4321490791fSaliguori } 433a9465922Sbellard } else { 434585f8587Sbellard /* Note: in this case, no need to wait */ 4353fc48d09SFrediano Ziglio qemu_iovec_memset(&hd_qiov, 0, 512 * cur_nr_sectors); 4361490791fSaliguori } 437c2bdd990SFrediano Ziglio } else if (cluster_offset & QCOW_OFLAG_COMPRESSED) { 438585f8587Sbellard /* add AIO support for compressed blocks ? */ 439c2bdd990SFrediano Ziglio ret = qcow2_decompress_cluster(bs, cluster_offset); 4408af36488SKevin Wolf if (ret < 0) { 4413fc48d09SFrediano Ziglio goto fail; 4428af36488SKevin Wolf } 443bd28f835SKevin Wolf 4443fc48d09SFrediano Ziglio qemu_iovec_from_buffer(&hd_qiov, 445bd28f835SKevin Wolf s->cluster_cache + index_in_cluster * 512, 446faf575c1SFrediano Ziglio 512 * cur_nr_sectors); 447585f8587Sbellard } else { 448c2bdd990SFrediano Ziglio if ((cluster_offset & 511) != 0) { 4493fc48d09SFrediano Ziglio ret = -EIO; 4503fc48d09SFrediano Ziglio goto fail; 451585f8587Sbellard } 452c87c0672Saliguori 453bd28f835SKevin Wolf if (s->crypt_method) { 454bd28f835SKevin Wolf /* 455bd28f835SKevin Wolf * For encrypted images, read everything into a temporary 456bd28f835SKevin Wolf * contiguous buffer on which the AES functions can work. 457bd28f835SKevin Wolf */ 4583fc48d09SFrediano Ziglio if (!cluster_data) { 4593fc48d09SFrediano Ziglio cluster_data = 460dea43a65SFrediano Ziglio qemu_blockalign(bs, QCOW_MAX_CRYPT_CLUSTERS * s->cluster_size); 461bd28f835SKevin Wolf } 462bd28f835SKevin Wolf 463faf575c1SFrediano Ziglio assert(cur_nr_sectors <= 464bd28f835SKevin Wolf QCOW_MAX_CRYPT_CLUSTERS * s->cluster_sectors); 4653fc48d09SFrediano Ziglio qemu_iovec_reset(&hd_qiov); 4663fc48d09SFrediano Ziglio qemu_iovec_add(&hd_qiov, cluster_data, 467faf575c1SFrediano Ziglio 512 * cur_nr_sectors); 468bd28f835SKevin Wolf } 469bd28f835SKevin Wolf 47066f82ceeSKevin Wolf BLKDBG_EVENT(bs->file, BLKDBG_READ_AIO); 47168d100e9SKevin Wolf qemu_co_mutex_unlock(&s->lock); 47268d100e9SKevin Wolf ret = bdrv_co_readv(bs->file, 473c2bdd990SFrediano Ziglio (cluster_offset >> 9) + index_in_cluster, 4743fc48d09SFrediano Ziglio cur_nr_sectors, &hd_qiov); 47568d100e9SKevin Wolf qemu_co_mutex_lock(&s->lock); 47668d100e9SKevin Wolf if (ret < 0) { 4773fc48d09SFrediano Ziglio goto fail; 478585f8587Sbellard } 479faf575c1SFrediano Ziglio if (s->crypt_method) { 4803fc48d09SFrediano Ziglio qcow2_encrypt_sectors(s, sector_num, cluster_data, 4813fc48d09SFrediano Ziglio cluster_data, cur_nr_sectors, 0, &s->aes_decrypt_key); 4823fc48d09SFrediano Ziglio qemu_iovec_reset(&hd_qiov); 4833fc48d09SFrediano Ziglio qemu_iovec_copy(&hd_qiov, qiov, bytes_done, 484faf575c1SFrediano Ziglio cur_nr_sectors * 512); 4853fc48d09SFrediano Ziglio qemu_iovec_from_buffer(&hd_qiov, cluster_data, 486faf575c1SFrediano Ziglio 512 * cur_nr_sectors); 487171e3d6bSKevin Wolf } 488faf575c1SFrediano Ziglio } 489faf575c1SFrediano Ziglio 4903fc48d09SFrediano Ziglio remaining_sectors -= cur_nr_sectors; 4913fc48d09SFrediano Ziglio sector_num += cur_nr_sectors; 4923fc48d09SFrediano Ziglio bytes_done += cur_nr_sectors * 512; 4935ebaa27eSFrediano Ziglio } 4943fc48d09SFrediano Ziglio ret = 0; 495f141eafeSaliguori 4963fc48d09SFrediano Ziglio fail: 49768d100e9SKevin Wolf qemu_co_mutex_unlock(&s->lock); 49868d100e9SKevin Wolf 4993fc48d09SFrediano Ziglio qemu_iovec_destroy(&hd_qiov); 500dea43a65SFrediano Ziglio qemu_vfree(cluster_data); 50168d100e9SKevin Wolf 50268d100e9SKevin Wolf return ret; 503585f8587Sbellard } 504585f8587Sbellard 50568d100e9SKevin Wolf static void run_dependent_requests(BDRVQcowState *s, QCowL2Meta *m) 506f214978aSKevin Wolf { 507f214978aSKevin Wolf /* Take the request off the list of running requests */ 508f214978aSKevin Wolf if (m->nb_clusters != 0) { 50972cf2d4fSBlue Swirl QLIST_REMOVE(m, next_in_flight); 510f214978aSKevin Wolf } 511f214978aSKevin Wolf 512d4c146f0SStefan Hajnoczi /* Restart all dependent requests */ 51368d100e9SKevin Wolf if (!qemu_co_queue_empty(&m->dependent_requests)) { 51468d100e9SKevin Wolf qemu_co_mutex_unlock(&s->lock); 51568d100e9SKevin Wolf while(qemu_co_queue_next(&m->dependent_requests)); 51668d100e9SKevin Wolf qemu_co_mutex_lock(&s->lock); 51768d100e9SKevin Wolf } 518f214978aSKevin Wolf } 519f214978aSKevin Wolf 5203fc48d09SFrediano Ziglio static int qcow2_co_writev(BlockDriverState *bs, 5213fc48d09SFrediano Ziglio int64_t sector_num, 5223fc48d09SFrediano Ziglio int remaining_sectors, 5233fc48d09SFrediano Ziglio QEMUIOVector *qiov) 524585f8587Sbellard { 525585f8587Sbellard BDRVQcowState *s = bs->opaque; 526585f8587Sbellard int index_in_cluster; 527095a9c58Saliguori int n_end; 52868d100e9SKevin Wolf int ret; 529faf575c1SFrediano Ziglio int cur_nr_sectors; /* number of sectors in current iteration */ 530c2bdd990SFrediano Ziglio uint64_t cluster_offset; 5313fc48d09SFrediano Ziglio QEMUIOVector hd_qiov; 5323fc48d09SFrediano Ziglio uint64_t bytes_done = 0; 5333fc48d09SFrediano Ziglio uint8_t *cluster_data = NULL; 5348e217d53SKevin Wolf QCowL2Meta l2meta = { 5358e217d53SKevin Wolf .nb_clusters = 0, 5368e217d53SKevin Wolf }; 537c2271403SFrediano Ziglio 538c2271403SFrediano Ziglio qemu_co_queue_init(&l2meta.dependent_requests); 539585f8587Sbellard 5403fc48d09SFrediano Ziglio qemu_iovec_init(&hd_qiov, qiov->niov); 541585f8587Sbellard 5423fc48d09SFrediano Ziglio s->cluster_cache_offset = -1; /* disable compressed cache */ 5433fc48d09SFrediano Ziglio 5443fc48d09SFrediano Ziglio qemu_co_mutex_lock(&s->lock); 5453fc48d09SFrediano Ziglio 5463fc48d09SFrediano Ziglio while (remaining_sectors != 0) { 5473fc48d09SFrediano Ziglio 5483fc48d09SFrediano Ziglio index_in_cluster = sector_num & (s->cluster_sectors - 1); 5493fc48d09SFrediano Ziglio n_end = index_in_cluster + remaining_sectors; 550095a9c58Saliguori if (s->crypt_method && 5515ebaa27eSFrediano Ziglio n_end > QCOW_MAX_CRYPT_CLUSTERS * s->cluster_sectors) { 552095a9c58Saliguori n_end = QCOW_MAX_CRYPT_CLUSTERS * s->cluster_sectors; 5535ebaa27eSFrediano Ziglio } 554095a9c58Saliguori 5553fc48d09SFrediano Ziglio ret = qcow2_alloc_cluster_offset(bs, sector_num << 9, 556c2271403SFrediano Ziglio index_in_cluster, n_end, &cur_nr_sectors, &l2meta); 557148da7eaSKevin Wolf if (ret < 0) { 5583fc48d09SFrediano Ziglio goto fail; 559148da7eaSKevin Wolf } 560148da7eaSKevin Wolf 561c2bdd990SFrediano Ziglio cluster_offset = l2meta.cluster_offset; 562c2bdd990SFrediano Ziglio assert((cluster_offset & 511) == 0); 563148da7eaSKevin Wolf 5643fc48d09SFrediano Ziglio qemu_iovec_reset(&hd_qiov); 5653fc48d09SFrediano Ziglio qemu_iovec_copy(&hd_qiov, qiov, bytes_done, 566faf575c1SFrediano Ziglio cur_nr_sectors * 512); 5676f5f060bSKevin Wolf 568585f8587Sbellard if (s->crypt_method) { 5693fc48d09SFrediano Ziglio if (!cluster_data) { 570dea43a65SFrediano Ziglio cluster_data = qemu_blockalign(bs, QCOW_MAX_CRYPT_CLUSTERS * 571095a9c58Saliguori s->cluster_size); 572585f8587Sbellard } 5736f5f060bSKevin Wolf 5743fc48d09SFrediano Ziglio assert(hd_qiov.size <= 5755ebaa27eSFrediano Ziglio QCOW_MAX_CRYPT_CLUSTERS * s->cluster_size); 5763fc48d09SFrediano Ziglio qemu_iovec_to_buffer(&hd_qiov, cluster_data); 5776f5f060bSKevin Wolf 5783fc48d09SFrediano Ziglio qcow2_encrypt_sectors(s, sector_num, cluster_data, 5793fc48d09SFrediano Ziglio cluster_data, cur_nr_sectors, 1, &s->aes_encrypt_key); 5806f5f060bSKevin Wolf 5813fc48d09SFrediano Ziglio qemu_iovec_reset(&hd_qiov); 5823fc48d09SFrediano Ziglio qemu_iovec_add(&hd_qiov, cluster_data, 583faf575c1SFrediano Ziglio cur_nr_sectors * 512); 584585f8587Sbellard } 5856f5f060bSKevin Wolf 58666f82ceeSKevin Wolf BLKDBG_EVENT(bs->file, BLKDBG_WRITE_AIO); 58768d100e9SKevin Wolf qemu_co_mutex_unlock(&s->lock); 58868d100e9SKevin Wolf ret = bdrv_co_writev(bs->file, 589c2bdd990SFrediano Ziglio (cluster_offset >> 9) + index_in_cluster, 5903fc48d09SFrediano Ziglio cur_nr_sectors, &hd_qiov); 59168d100e9SKevin Wolf qemu_co_mutex_lock(&s->lock); 59268d100e9SKevin Wolf if (ret < 0) { 5933fc48d09SFrediano Ziglio goto fail; 594171e3d6bSKevin Wolf } 595f141eafeSaliguori 596c2271403SFrediano Ziglio ret = qcow2_alloc_cluster_link_l2(bs, &l2meta); 597faf575c1SFrediano Ziglio if (ret < 0) { 5983fc48d09SFrediano Ziglio goto fail; 599faf575c1SFrediano Ziglio } 600faf575c1SFrediano Ziglio 6010fa9131aSKevin Wolf run_dependent_requests(s, &l2meta); 6020fa9131aSKevin Wolf 6033fc48d09SFrediano Ziglio remaining_sectors -= cur_nr_sectors; 6043fc48d09SFrediano Ziglio sector_num += cur_nr_sectors; 6053fc48d09SFrediano Ziglio bytes_done += cur_nr_sectors * 512; 6065ebaa27eSFrediano Ziglio } 6073fc48d09SFrediano Ziglio ret = 0; 608faf575c1SFrediano Ziglio 6093fc48d09SFrediano Ziglio fail: 6100fa9131aSKevin Wolf run_dependent_requests(s, &l2meta); 6110fa9131aSKevin Wolf 61268d100e9SKevin Wolf qemu_co_mutex_unlock(&s->lock); 613585f8587Sbellard 6143fc48d09SFrediano Ziglio qemu_iovec_destroy(&hd_qiov); 615dea43a65SFrediano Ziglio qemu_vfree(cluster_data); 61642496d62SKevin Wolf 61768d100e9SKevin Wolf return ret; 618585f8587Sbellard } 619585f8587Sbellard 6207c80ab3fSJes Sorensen static void qcow2_close(BlockDriverState *bs) 621585f8587Sbellard { 622585f8587Sbellard BDRVQcowState *s = bs->opaque; 6237267c094SAnthony Liguori g_free(s->l1_table); 62429c1a730SKevin Wolf 62529c1a730SKevin Wolf qcow2_cache_flush(bs, s->l2_table_cache); 62629c1a730SKevin Wolf qcow2_cache_flush(bs, s->refcount_block_cache); 62729c1a730SKevin Wolf 62829c1a730SKevin Wolf qcow2_cache_destroy(bs, s->l2_table_cache); 62929c1a730SKevin Wolf qcow2_cache_destroy(bs, s->refcount_block_cache); 63029c1a730SKevin Wolf 6317267c094SAnthony Liguori g_free(s->cluster_cache); 632dea43a65SFrediano Ziglio qemu_vfree(s->cluster_data); 633ed6ccf0fSKevin Wolf qcow2_refcount_close(bs); 634585f8587Sbellard } 635585f8587Sbellard 636*06d9260fSAnthony Liguori static void qcow2_invalidate_cache(BlockDriverState *bs) 637*06d9260fSAnthony Liguori { 638*06d9260fSAnthony Liguori BDRVQcowState *s = bs->opaque; 639*06d9260fSAnthony Liguori int flags = s->flags; 640*06d9260fSAnthony Liguori AES_KEY aes_encrypt_key; 641*06d9260fSAnthony Liguori AES_KEY aes_decrypt_key; 642*06d9260fSAnthony Liguori uint32_t crypt_method = 0; 643*06d9260fSAnthony Liguori 644*06d9260fSAnthony Liguori /* 645*06d9260fSAnthony Liguori * Backing files are read-only which makes all of their metadata immutable, 646*06d9260fSAnthony Liguori * that means we don't have to worry about reopening them here. 647*06d9260fSAnthony Liguori */ 648*06d9260fSAnthony Liguori 649*06d9260fSAnthony Liguori if (s->crypt_method) { 650*06d9260fSAnthony Liguori crypt_method = s->crypt_method; 651*06d9260fSAnthony Liguori memcpy(&aes_encrypt_key, &s->aes_encrypt_key, sizeof(aes_encrypt_key)); 652*06d9260fSAnthony Liguori memcpy(&aes_decrypt_key, &s->aes_decrypt_key, sizeof(aes_decrypt_key)); 653*06d9260fSAnthony Liguori } 654*06d9260fSAnthony Liguori 655*06d9260fSAnthony Liguori qcow2_close(bs); 656*06d9260fSAnthony Liguori 657*06d9260fSAnthony Liguori memset(s, 0, sizeof(BDRVQcowState)); 658*06d9260fSAnthony Liguori qcow2_open(bs, flags); 659*06d9260fSAnthony Liguori 660*06d9260fSAnthony Liguori if (crypt_method) { 661*06d9260fSAnthony Liguori s->crypt_method = crypt_method; 662*06d9260fSAnthony Liguori memcpy(&s->aes_encrypt_key, &aes_encrypt_key, sizeof(aes_encrypt_key)); 663*06d9260fSAnthony Liguori memcpy(&s->aes_decrypt_key, &aes_decrypt_key, sizeof(aes_decrypt_key)); 664*06d9260fSAnthony Liguori } 665*06d9260fSAnthony Liguori } 666*06d9260fSAnthony Liguori 667756e6736SKevin Wolf /* 668756e6736SKevin Wolf * Updates the variable length parts of the qcow2 header, i.e. the backing file 669756e6736SKevin Wolf * name and all extensions. qcow2 was not designed to allow such changes, so if 670756e6736SKevin Wolf * we run out of space (we can only use the first cluster) this function may 671756e6736SKevin Wolf * fail. 672756e6736SKevin Wolf * 673756e6736SKevin Wolf * Returns 0 on success, -errno in error cases. 674756e6736SKevin Wolf */ 675756e6736SKevin Wolf static int qcow2_update_ext_header(BlockDriverState *bs, 676756e6736SKevin Wolf const char *backing_file, const char *backing_fmt) 677756e6736SKevin Wolf { 678756e6736SKevin Wolf size_t backing_file_len = 0; 679756e6736SKevin Wolf size_t backing_fmt_len = 0; 680756e6736SKevin Wolf BDRVQcowState *s = bs->opaque; 681756e6736SKevin Wolf QCowExtension ext_backing_fmt = {0, 0}; 682756e6736SKevin Wolf int ret; 683756e6736SKevin Wolf 684756e6736SKevin Wolf /* Backing file format doesn't make sense without a backing file */ 685756e6736SKevin Wolf if (backing_fmt && !backing_file) { 686756e6736SKevin Wolf return -EINVAL; 687756e6736SKevin Wolf } 688756e6736SKevin Wolf 689756e6736SKevin Wolf /* Prepare the backing file format extension if needed */ 690756e6736SKevin Wolf if (backing_fmt) { 691756e6736SKevin Wolf ext_backing_fmt.len = cpu_to_be32(strlen(backing_fmt)); 6927c80ab3fSJes Sorensen ext_backing_fmt.magic = cpu_to_be32(QCOW2_EXT_MAGIC_BACKING_FORMAT); 693756e6736SKevin Wolf backing_fmt_len = ((sizeof(ext_backing_fmt) 694756e6736SKevin Wolf + strlen(backing_fmt) + 7) & ~7); 695756e6736SKevin Wolf } 696756e6736SKevin Wolf 697756e6736SKevin Wolf /* Check if we can fit the new header into the first cluster */ 698756e6736SKevin Wolf if (backing_file) { 699756e6736SKevin Wolf backing_file_len = strlen(backing_file); 700756e6736SKevin Wolf } 701756e6736SKevin Wolf 702756e6736SKevin Wolf size_t header_size = sizeof(QCowHeader) + backing_file_len 703756e6736SKevin Wolf + backing_fmt_len; 704756e6736SKevin Wolf 705756e6736SKevin Wolf if (header_size > s->cluster_size) { 706756e6736SKevin Wolf return -ENOSPC; 707756e6736SKevin Wolf } 708756e6736SKevin Wolf 709756e6736SKevin Wolf /* Rewrite backing file name and qcow2 extensions */ 710756e6736SKevin Wolf size_t ext_size = header_size - sizeof(QCowHeader); 711756e6736SKevin Wolf uint8_t buf[ext_size]; 712756e6736SKevin Wolf size_t offset = 0; 713756e6736SKevin Wolf size_t backing_file_offset = 0; 714756e6736SKevin Wolf 715756e6736SKevin Wolf if (backing_file) { 716756e6736SKevin Wolf if (backing_fmt) { 717756e6736SKevin Wolf int padding = backing_fmt_len - 718756e6736SKevin Wolf (sizeof(ext_backing_fmt) + strlen(backing_fmt)); 719756e6736SKevin Wolf 720756e6736SKevin Wolf memcpy(buf + offset, &ext_backing_fmt, sizeof(ext_backing_fmt)); 721756e6736SKevin Wolf offset += sizeof(ext_backing_fmt); 722756e6736SKevin Wolf 723756e6736SKevin Wolf memcpy(buf + offset, backing_fmt, strlen(backing_fmt)); 724756e6736SKevin Wolf offset += strlen(backing_fmt); 725756e6736SKevin Wolf 726756e6736SKevin Wolf memset(buf + offset, 0, padding); 727756e6736SKevin Wolf offset += padding; 728756e6736SKevin Wolf } 729756e6736SKevin Wolf 730756e6736SKevin Wolf memcpy(buf + offset, backing_file, backing_file_len); 731756e6736SKevin Wolf backing_file_offset = sizeof(QCowHeader) + offset; 732756e6736SKevin Wolf } 733756e6736SKevin Wolf 7348b3b7206SKevin Wolf ret = bdrv_pwrite_sync(bs->file, sizeof(QCowHeader), buf, ext_size); 735756e6736SKevin Wolf if (ret < 0) { 736756e6736SKevin Wolf goto fail; 737756e6736SKevin Wolf } 738756e6736SKevin Wolf 739756e6736SKevin Wolf /* Update header fields */ 740756e6736SKevin Wolf uint64_t be_backing_file_offset = cpu_to_be64(backing_file_offset); 741756e6736SKevin Wolf uint32_t be_backing_file_size = cpu_to_be32(backing_file_len); 742756e6736SKevin Wolf 7438b3b7206SKevin Wolf ret = bdrv_pwrite_sync(bs->file, offsetof(QCowHeader, backing_file_offset), 744756e6736SKevin Wolf &be_backing_file_offset, sizeof(uint64_t)); 745756e6736SKevin Wolf if (ret < 0) { 746756e6736SKevin Wolf goto fail; 747756e6736SKevin Wolf } 748756e6736SKevin Wolf 7498b3b7206SKevin Wolf ret = bdrv_pwrite_sync(bs->file, offsetof(QCowHeader, backing_file_size), 750756e6736SKevin Wolf &be_backing_file_size, sizeof(uint32_t)); 751756e6736SKevin Wolf if (ret < 0) { 752756e6736SKevin Wolf goto fail; 753756e6736SKevin Wolf } 754756e6736SKevin Wolf 755756e6736SKevin Wolf ret = 0; 756756e6736SKevin Wolf fail: 757756e6736SKevin Wolf return ret; 758756e6736SKevin Wolf } 759756e6736SKevin Wolf 760756e6736SKevin Wolf static int qcow2_change_backing_file(BlockDriverState *bs, 761756e6736SKevin Wolf const char *backing_file, const char *backing_fmt) 762756e6736SKevin Wolf { 763756e6736SKevin Wolf return qcow2_update_ext_header(bs, backing_file, backing_fmt); 764756e6736SKevin Wolf } 765756e6736SKevin Wolf 766a35e1c17SKevin Wolf static int preallocate(BlockDriverState *bs) 767a35e1c17SKevin Wolf { 768a35e1c17SKevin Wolf uint64_t nb_sectors; 769a35e1c17SKevin Wolf uint64_t offset; 770a35e1c17SKevin Wolf int num; 771148da7eaSKevin Wolf int ret; 772a35e1c17SKevin Wolf QCowL2Meta meta; 773a35e1c17SKevin Wolf 774a35e1c17SKevin Wolf nb_sectors = bdrv_getlength(bs) >> 9; 775a35e1c17SKevin Wolf offset = 0; 77668d100e9SKevin Wolf qemu_co_queue_init(&meta.dependent_requests); 777148da7eaSKevin Wolf meta.cluster_offset = 0; 778a35e1c17SKevin Wolf 779a35e1c17SKevin Wolf while (nb_sectors) { 780a35e1c17SKevin Wolf num = MIN(nb_sectors, INT_MAX >> 9); 781148da7eaSKevin Wolf ret = qcow2_alloc_cluster_offset(bs, offset, 0, num, &num, &meta); 782148da7eaSKevin Wolf if (ret < 0) { 78319dbcbf7SKevin Wolf return ret; 784a35e1c17SKevin Wolf } 785a35e1c17SKevin Wolf 78619dbcbf7SKevin Wolf ret = qcow2_alloc_cluster_link_l2(bs, &meta); 78719dbcbf7SKevin Wolf if (ret < 0) { 788148da7eaSKevin Wolf qcow2_free_any_clusters(bs, meta.cluster_offset, meta.nb_clusters); 78919dbcbf7SKevin Wolf return ret; 790a35e1c17SKevin Wolf } 791a35e1c17SKevin Wolf 792f214978aSKevin Wolf /* There are no dependent requests, but we need to remove our request 793f214978aSKevin Wolf * from the list of in-flight requests */ 79468d100e9SKevin Wolf run_dependent_requests(bs->opaque, &meta); 795f214978aSKevin Wolf 796a35e1c17SKevin Wolf /* TODO Preallocate data if requested */ 797a35e1c17SKevin Wolf 798a35e1c17SKevin Wolf nb_sectors -= num; 799a35e1c17SKevin Wolf offset += num << 9; 800a35e1c17SKevin Wolf } 801a35e1c17SKevin Wolf 802a35e1c17SKevin Wolf /* 803a35e1c17SKevin Wolf * It is expected that the image file is large enough to actually contain 804a35e1c17SKevin Wolf * all of the allocated clusters (otherwise we get failing reads after 805a35e1c17SKevin Wolf * EOF). Extend the image to the last allocated sector. 806a35e1c17SKevin Wolf */ 807148da7eaSKevin Wolf if (meta.cluster_offset != 0) { 808ea80b906SKevin Wolf uint8_t buf[512]; 809ea80b906SKevin Wolf memset(buf, 0, 512); 81019dbcbf7SKevin Wolf ret = bdrv_write(bs->file, (meta.cluster_offset >> 9) + num - 1, buf, 1); 81119dbcbf7SKevin Wolf if (ret < 0) { 81219dbcbf7SKevin Wolf return ret; 81319dbcbf7SKevin Wolf } 814a35e1c17SKevin Wolf } 815a35e1c17SKevin Wolf 816a35e1c17SKevin Wolf return 0; 817a35e1c17SKevin Wolf } 818a35e1c17SKevin Wolf 8197c80ab3fSJes Sorensen static int qcow2_create2(const char *filename, int64_t total_size, 820a9420734SKevin Wolf const char *backing_file, const char *backing_format, 821a9420734SKevin Wolf int flags, size_t cluster_size, int prealloc, 822a9420734SKevin Wolf QEMUOptionParameter *options) 823a9420734SKevin Wolf { 824a9420734SKevin Wolf /* Calulate cluster_bits */ 825a9420734SKevin Wolf int cluster_bits; 826a9420734SKevin Wolf cluster_bits = ffs(cluster_size) - 1; 827a9420734SKevin Wolf if (cluster_bits < MIN_CLUSTER_BITS || cluster_bits > MAX_CLUSTER_BITS || 828a9420734SKevin Wolf (1 << cluster_bits) != cluster_size) 829a9420734SKevin Wolf { 830a9420734SKevin Wolf error_report( 8316daf194dSMarkus Armbruster "Cluster size must be a power of two between %d and %dk", 832a9420734SKevin Wolf 1 << MIN_CLUSTER_BITS, 1 << (MAX_CLUSTER_BITS - 10)); 833a9420734SKevin Wolf return -EINVAL; 834a9420734SKevin Wolf } 835a9420734SKevin Wolf 836a9420734SKevin Wolf /* 837a9420734SKevin Wolf * Open the image file and write a minimal qcow2 header. 838a9420734SKevin Wolf * 839a9420734SKevin Wolf * We keep things simple and start with a zero-sized image. We also 840a9420734SKevin Wolf * do without refcount blocks or a L1 table for now. We'll fix the 841a9420734SKevin Wolf * inconsistency later. 842a9420734SKevin Wolf * 843a9420734SKevin Wolf * We do need a refcount table because growing the refcount table means 844a9420734SKevin Wolf * allocating two new refcount blocks - the seconds of which would be at 845a9420734SKevin Wolf * 2 GB for 64k clusters, and we don't want to have a 2 GB initial file 846a9420734SKevin Wolf * size for any qcow2 image. 847a9420734SKevin Wolf */ 848a9420734SKevin Wolf BlockDriverState* bs; 849a9420734SKevin Wolf QCowHeader header; 850a9420734SKevin Wolf uint8_t* refcount_table; 851a9420734SKevin Wolf int ret; 852a9420734SKevin Wolf 853a9420734SKevin Wolf ret = bdrv_create_file(filename, options); 854a9420734SKevin Wolf if (ret < 0) { 855a9420734SKevin Wolf return ret; 856a9420734SKevin Wolf } 857a9420734SKevin Wolf 858a9420734SKevin Wolf ret = bdrv_file_open(&bs, filename, BDRV_O_RDWR); 859a9420734SKevin Wolf if (ret < 0) { 860a9420734SKevin Wolf return ret; 861a9420734SKevin Wolf } 862a9420734SKevin Wolf 863a9420734SKevin Wolf /* Write the header */ 864a9420734SKevin Wolf memset(&header, 0, sizeof(header)); 865a9420734SKevin Wolf header.magic = cpu_to_be32(QCOW_MAGIC); 866a9420734SKevin Wolf header.version = cpu_to_be32(QCOW_VERSION); 867a9420734SKevin Wolf header.cluster_bits = cpu_to_be32(cluster_bits); 868a9420734SKevin Wolf header.size = cpu_to_be64(0); 869a9420734SKevin Wolf header.l1_table_offset = cpu_to_be64(0); 870a9420734SKevin Wolf header.l1_size = cpu_to_be32(0); 871a9420734SKevin Wolf header.refcount_table_offset = cpu_to_be64(cluster_size); 872a9420734SKevin Wolf header.refcount_table_clusters = cpu_to_be32(1); 873a9420734SKevin Wolf 874a9420734SKevin Wolf if (flags & BLOCK_FLAG_ENCRYPT) { 875a9420734SKevin Wolf header.crypt_method = cpu_to_be32(QCOW_CRYPT_AES); 876a9420734SKevin Wolf } else { 877a9420734SKevin Wolf header.crypt_method = cpu_to_be32(QCOW_CRYPT_NONE); 878a9420734SKevin Wolf } 879a9420734SKevin Wolf 880a9420734SKevin Wolf ret = bdrv_pwrite(bs, 0, &header, sizeof(header)); 881a9420734SKevin Wolf if (ret < 0) { 882a9420734SKevin Wolf goto out; 883a9420734SKevin Wolf } 884a9420734SKevin Wolf 885a9420734SKevin Wolf /* Write an empty refcount table */ 8867267c094SAnthony Liguori refcount_table = g_malloc0(cluster_size); 887a9420734SKevin Wolf ret = bdrv_pwrite(bs, cluster_size, refcount_table, cluster_size); 8887267c094SAnthony Liguori g_free(refcount_table); 889a9420734SKevin Wolf 890a9420734SKevin Wolf if (ret < 0) { 891a9420734SKevin Wolf goto out; 892a9420734SKevin Wolf } 893a9420734SKevin Wolf 894a9420734SKevin Wolf bdrv_close(bs); 895a9420734SKevin Wolf 896a9420734SKevin Wolf /* 897a9420734SKevin Wolf * And now open the image and make it consistent first (i.e. increase the 898a9420734SKevin Wolf * refcount of the cluster that is occupied by the header and the refcount 899a9420734SKevin Wolf * table) 900a9420734SKevin Wolf */ 901a9420734SKevin Wolf BlockDriver* drv = bdrv_find_format("qcow2"); 902a9420734SKevin Wolf assert(drv != NULL); 903e1a7107fSKevin Wolf ret = bdrv_open(bs, filename, 904e1a7107fSKevin Wolf BDRV_O_RDWR | BDRV_O_CACHE_WB | BDRV_O_NO_FLUSH, drv); 905a9420734SKevin Wolf if (ret < 0) { 906a9420734SKevin Wolf goto out; 907a9420734SKevin Wolf } 908a9420734SKevin Wolf 909a9420734SKevin Wolf ret = qcow2_alloc_clusters(bs, 2 * cluster_size); 910a9420734SKevin Wolf if (ret < 0) { 911a9420734SKevin Wolf goto out; 912a9420734SKevin Wolf 913a9420734SKevin Wolf } else if (ret != 0) { 914a9420734SKevin Wolf error_report("Huh, first cluster in empty image is already in use?"); 915a9420734SKevin Wolf abort(); 916a9420734SKevin Wolf } 917a9420734SKevin Wolf 918a9420734SKevin Wolf /* Okay, now that we have a valid image, let's give it the right size */ 919a9420734SKevin Wolf ret = bdrv_truncate(bs, total_size * BDRV_SECTOR_SIZE); 920a9420734SKevin Wolf if (ret < 0) { 921a9420734SKevin Wolf goto out; 922a9420734SKevin Wolf } 923a9420734SKevin Wolf 924a9420734SKevin Wolf /* Want a backing file? There you go.*/ 925a9420734SKevin Wolf if (backing_file) { 926a9420734SKevin Wolf ret = bdrv_change_backing_file(bs, backing_file, backing_format); 927a9420734SKevin Wolf if (ret < 0) { 928a9420734SKevin Wolf goto out; 929a9420734SKevin Wolf } 930a9420734SKevin Wolf } 931a9420734SKevin Wolf 932a9420734SKevin Wolf /* And if we're supposed to preallocate metadata, do that now */ 933a9420734SKevin Wolf if (prealloc) { 934a9420734SKevin Wolf ret = preallocate(bs); 935a9420734SKevin Wolf if (ret < 0) { 936a9420734SKevin Wolf goto out; 937a9420734SKevin Wolf } 938a9420734SKevin Wolf } 939a9420734SKevin Wolf 940a9420734SKevin Wolf ret = 0; 941a9420734SKevin Wolf out: 942a9420734SKevin Wolf bdrv_delete(bs); 943a9420734SKevin Wolf return ret; 944a9420734SKevin Wolf } 945de5f3f40SKevin Wolf 9467c80ab3fSJes Sorensen static int qcow2_create(const char *filename, QEMUOptionParameter *options) 947de5f3f40SKevin Wolf { 948de5f3f40SKevin Wolf const char *backing_file = NULL; 949de5f3f40SKevin Wolf const char *backing_fmt = NULL; 950de5f3f40SKevin Wolf uint64_t sectors = 0; 951de5f3f40SKevin Wolf int flags = 0; 95299cce9faSKevin Wolf size_t cluster_size = DEFAULT_CLUSTER_SIZE; 953de5f3f40SKevin Wolf int prealloc = 0; 954de5f3f40SKevin Wolf 955de5f3f40SKevin Wolf /* Read out options */ 956de5f3f40SKevin Wolf while (options && options->name) { 957de5f3f40SKevin Wolf if (!strcmp(options->name, BLOCK_OPT_SIZE)) { 958de5f3f40SKevin Wolf sectors = options->value.n / 512; 959de5f3f40SKevin Wolf } else if (!strcmp(options->name, BLOCK_OPT_BACKING_FILE)) { 960de5f3f40SKevin Wolf backing_file = options->value.s; 961de5f3f40SKevin Wolf } else if (!strcmp(options->name, BLOCK_OPT_BACKING_FMT)) { 962de5f3f40SKevin Wolf backing_fmt = options->value.s; 963de5f3f40SKevin Wolf } else if (!strcmp(options->name, BLOCK_OPT_ENCRYPT)) { 964de5f3f40SKevin Wolf flags |= options->value.n ? BLOCK_FLAG_ENCRYPT : 0; 965de5f3f40SKevin Wolf } else if (!strcmp(options->name, BLOCK_OPT_CLUSTER_SIZE)) { 966de5f3f40SKevin Wolf if (options->value.n) { 967de5f3f40SKevin Wolf cluster_size = options->value.n; 968de5f3f40SKevin Wolf } 969de5f3f40SKevin Wolf } else if (!strcmp(options->name, BLOCK_OPT_PREALLOC)) { 970de5f3f40SKevin Wolf if (!options->value.s || !strcmp(options->value.s, "off")) { 971de5f3f40SKevin Wolf prealloc = 0; 972de5f3f40SKevin Wolf } else if (!strcmp(options->value.s, "metadata")) { 973de5f3f40SKevin Wolf prealloc = 1; 974de5f3f40SKevin Wolf } else { 975de5f3f40SKevin Wolf fprintf(stderr, "Invalid preallocation mode: '%s'\n", 976de5f3f40SKevin Wolf options->value.s); 977de5f3f40SKevin Wolf return -EINVAL; 978de5f3f40SKevin Wolf } 979de5f3f40SKevin Wolf } 980de5f3f40SKevin Wolf options++; 981de5f3f40SKevin Wolf } 982de5f3f40SKevin Wolf 983de5f3f40SKevin Wolf if (backing_file && prealloc) { 984de5f3f40SKevin Wolf fprintf(stderr, "Backing file and preallocation cannot be used at " 985de5f3f40SKevin Wolf "the same time\n"); 986de5f3f40SKevin Wolf return -EINVAL; 987de5f3f40SKevin Wolf } 988de5f3f40SKevin Wolf 9897c80ab3fSJes Sorensen return qcow2_create2(filename, sectors, backing_file, backing_fmt, flags, 990a9420734SKevin Wolf cluster_size, prealloc, options); 991de5f3f40SKevin Wolf } 992de5f3f40SKevin Wolf 9937c80ab3fSJes Sorensen static int qcow2_make_empty(BlockDriverState *bs) 99420d97356SBlue Swirl { 99520d97356SBlue Swirl #if 0 99620d97356SBlue Swirl /* XXX: not correct */ 99720d97356SBlue Swirl BDRVQcowState *s = bs->opaque; 99820d97356SBlue Swirl uint32_t l1_length = s->l1_size * sizeof(uint64_t); 99920d97356SBlue Swirl int ret; 100020d97356SBlue Swirl 100120d97356SBlue Swirl memset(s->l1_table, 0, l1_length); 100266f82ceeSKevin Wolf if (bdrv_pwrite(bs->file, s->l1_table_offset, s->l1_table, l1_length) < 0) 100320d97356SBlue Swirl return -1; 100466f82ceeSKevin Wolf ret = bdrv_truncate(bs->file, s->l1_table_offset + l1_length); 100520d97356SBlue Swirl if (ret < 0) 100620d97356SBlue Swirl return ret; 100720d97356SBlue Swirl 100820d97356SBlue Swirl l2_cache_reset(bs); 100920d97356SBlue Swirl #endif 101020d97356SBlue Swirl return 0; 101120d97356SBlue Swirl } 101220d97356SBlue Swirl 10136db39ae2SPaolo Bonzini static coroutine_fn int qcow2_co_discard(BlockDriverState *bs, 10146db39ae2SPaolo Bonzini int64_t sector_num, int nb_sectors) 10155ea929e3SKevin Wolf { 10166db39ae2SPaolo Bonzini int ret; 10176db39ae2SPaolo Bonzini BDRVQcowState *s = bs->opaque; 10186db39ae2SPaolo Bonzini 10196db39ae2SPaolo Bonzini qemu_co_mutex_lock(&s->lock); 10206db39ae2SPaolo Bonzini ret = qcow2_discard_clusters(bs, sector_num << BDRV_SECTOR_BITS, 10215ea929e3SKevin Wolf nb_sectors); 10226db39ae2SPaolo Bonzini qemu_co_mutex_unlock(&s->lock); 10236db39ae2SPaolo Bonzini return ret; 10245ea929e3SKevin Wolf } 10255ea929e3SKevin Wolf 1026419b19d9SStefan Hajnoczi static int qcow2_truncate(BlockDriverState *bs, int64_t offset) 1027419b19d9SStefan Hajnoczi { 1028419b19d9SStefan Hajnoczi BDRVQcowState *s = bs->opaque; 1029419b19d9SStefan Hajnoczi int ret, new_l1_size; 1030419b19d9SStefan Hajnoczi 1031419b19d9SStefan Hajnoczi if (offset & 511) { 1032419b19d9SStefan Hajnoczi return -EINVAL; 1033419b19d9SStefan Hajnoczi } 1034419b19d9SStefan Hajnoczi 1035419b19d9SStefan Hajnoczi /* cannot proceed if image has snapshots */ 1036419b19d9SStefan Hajnoczi if (s->nb_snapshots) { 1037419b19d9SStefan Hajnoczi return -ENOTSUP; 1038419b19d9SStefan Hajnoczi } 1039419b19d9SStefan Hajnoczi 1040419b19d9SStefan Hajnoczi /* shrinking is currently not supported */ 1041419b19d9SStefan Hajnoczi if (offset < bs->total_sectors * 512) { 1042419b19d9SStefan Hajnoczi return -ENOTSUP; 1043419b19d9SStefan Hajnoczi } 1044419b19d9SStefan Hajnoczi 1045419b19d9SStefan Hajnoczi new_l1_size = size_to_l1(s, offset); 104672893756SStefan Hajnoczi ret = qcow2_grow_l1_table(bs, new_l1_size, true); 1047419b19d9SStefan Hajnoczi if (ret < 0) { 1048419b19d9SStefan Hajnoczi return ret; 1049419b19d9SStefan Hajnoczi } 1050419b19d9SStefan Hajnoczi 1051419b19d9SStefan Hajnoczi /* write updated header.size */ 1052419b19d9SStefan Hajnoczi offset = cpu_to_be64(offset); 10538b3b7206SKevin Wolf ret = bdrv_pwrite_sync(bs->file, offsetof(QCowHeader, size), 1054419b19d9SStefan Hajnoczi &offset, sizeof(uint64_t)); 1055419b19d9SStefan Hajnoczi if (ret < 0) { 1056419b19d9SStefan Hajnoczi return ret; 1057419b19d9SStefan Hajnoczi } 1058419b19d9SStefan Hajnoczi 1059419b19d9SStefan Hajnoczi s->l1_vm_state_index = new_l1_size; 1060419b19d9SStefan Hajnoczi return 0; 1061419b19d9SStefan Hajnoczi } 1062419b19d9SStefan Hajnoczi 106320d97356SBlue Swirl /* XXX: put compressed sectors first, then all the cluster aligned 106420d97356SBlue Swirl tables to avoid losing bytes in alignment */ 10657c80ab3fSJes Sorensen static int qcow2_write_compressed(BlockDriverState *bs, int64_t sector_num, 106620d97356SBlue Swirl const uint8_t *buf, int nb_sectors) 106720d97356SBlue Swirl { 106820d97356SBlue Swirl BDRVQcowState *s = bs->opaque; 106920d97356SBlue Swirl z_stream strm; 107020d97356SBlue Swirl int ret, out_len; 107120d97356SBlue Swirl uint8_t *out_buf; 107220d97356SBlue Swirl uint64_t cluster_offset; 107320d97356SBlue Swirl 107420d97356SBlue Swirl if (nb_sectors == 0) { 107520d97356SBlue Swirl /* align end of file to a sector boundary to ease reading with 107620d97356SBlue Swirl sector based I/Os */ 107766f82ceeSKevin Wolf cluster_offset = bdrv_getlength(bs->file); 107820d97356SBlue Swirl cluster_offset = (cluster_offset + 511) & ~511; 107966f82ceeSKevin Wolf bdrv_truncate(bs->file, cluster_offset); 108020d97356SBlue Swirl return 0; 108120d97356SBlue Swirl } 108220d97356SBlue Swirl 108320d97356SBlue Swirl if (nb_sectors != s->cluster_sectors) 108420d97356SBlue Swirl return -EINVAL; 108520d97356SBlue Swirl 10867267c094SAnthony Liguori out_buf = g_malloc(s->cluster_size + (s->cluster_size / 1000) + 128); 108720d97356SBlue Swirl 108820d97356SBlue Swirl /* best compression, small window, no zlib header */ 108920d97356SBlue Swirl memset(&strm, 0, sizeof(strm)); 109020d97356SBlue Swirl ret = deflateInit2(&strm, Z_DEFAULT_COMPRESSION, 109120d97356SBlue Swirl Z_DEFLATED, -12, 109220d97356SBlue Swirl 9, Z_DEFAULT_STRATEGY); 109320d97356SBlue Swirl if (ret != 0) { 10948f1efd00SKevin Wolf ret = -EINVAL; 10958f1efd00SKevin Wolf goto fail; 109620d97356SBlue Swirl } 109720d97356SBlue Swirl 109820d97356SBlue Swirl strm.avail_in = s->cluster_size; 109920d97356SBlue Swirl strm.next_in = (uint8_t *)buf; 110020d97356SBlue Swirl strm.avail_out = s->cluster_size; 110120d97356SBlue Swirl strm.next_out = out_buf; 110220d97356SBlue Swirl 110320d97356SBlue Swirl ret = deflate(&strm, Z_FINISH); 110420d97356SBlue Swirl if (ret != Z_STREAM_END && ret != Z_OK) { 110520d97356SBlue Swirl deflateEnd(&strm); 11068f1efd00SKevin Wolf ret = -EINVAL; 11078f1efd00SKevin Wolf goto fail; 110820d97356SBlue Swirl } 110920d97356SBlue Swirl out_len = strm.next_out - out_buf; 111020d97356SBlue Swirl 111120d97356SBlue Swirl deflateEnd(&strm); 111220d97356SBlue Swirl 111320d97356SBlue Swirl if (ret != Z_STREAM_END || out_len >= s->cluster_size) { 111420d97356SBlue Swirl /* could not compress: write normal cluster */ 11158f1efd00SKevin Wolf ret = bdrv_write(bs, sector_num, buf, s->cluster_sectors); 11168f1efd00SKevin Wolf if (ret < 0) { 11178f1efd00SKevin Wolf goto fail; 11188f1efd00SKevin Wolf } 111920d97356SBlue Swirl } else { 112020d97356SBlue Swirl cluster_offset = qcow2_alloc_compressed_cluster_offset(bs, 112120d97356SBlue Swirl sector_num << 9, out_len); 11228f1efd00SKevin Wolf if (!cluster_offset) { 11238f1efd00SKevin Wolf ret = -EIO; 11248f1efd00SKevin Wolf goto fail; 11258f1efd00SKevin Wolf } 112620d97356SBlue Swirl cluster_offset &= s->cluster_offset_mask; 112766f82ceeSKevin Wolf BLKDBG_EVENT(bs->file, BLKDBG_WRITE_COMPRESSED); 11288f1efd00SKevin Wolf ret = bdrv_pwrite(bs->file, cluster_offset, out_buf, out_len); 11298f1efd00SKevin Wolf if (ret < 0) { 11308f1efd00SKevin Wolf goto fail; 113120d97356SBlue Swirl } 113220d97356SBlue Swirl } 113320d97356SBlue Swirl 11348f1efd00SKevin Wolf ret = 0; 11358f1efd00SKevin Wolf fail: 11367267c094SAnthony Liguori g_free(out_buf); 11378f1efd00SKevin Wolf return ret; 113820d97356SBlue Swirl } 113920d97356SBlue Swirl 1140eb489bb1SKevin Wolf static int qcow2_co_flush_to_os(BlockDriverState *bs) 114120d97356SBlue Swirl { 114229c1a730SKevin Wolf BDRVQcowState *s = bs->opaque; 114329c1a730SKevin Wolf int ret; 114429c1a730SKevin Wolf 11458b94ff85SPaolo Bonzini qemu_co_mutex_lock(&s->lock); 114629c1a730SKevin Wolf ret = qcow2_cache_flush(bs, s->l2_table_cache); 114729c1a730SKevin Wolf if (ret < 0) { 1148c95de7e2SDong Xu Wang qemu_co_mutex_unlock(&s->lock); 11498b94ff85SPaolo Bonzini return ret; 115029c1a730SKevin Wolf } 115129c1a730SKevin Wolf 115229c1a730SKevin Wolf ret = qcow2_cache_flush(bs, s->refcount_block_cache); 115329c1a730SKevin Wolf if (ret < 0) { 1154c95de7e2SDong Xu Wang qemu_co_mutex_unlock(&s->lock); 11558b94ff85SPaolo Bonzini return ret; 115629c1a730SKevin Wolf } 11578b94ff85SPaolo Bonzini qemu_co_mutex_unlock(&s->lock); 115829c1a730SKevin Wolf 1159eb489bb1SKevin Wolf return 0; 1160eb489bb1SKevin Wolf } 1161eb489bb1SKevin Wolf 1162eb489bb1SKevin Wolf static int qcow2_co_flush_to_disk(BlockDriverState *bs) 1163eb489bb1SKevin Wolf { 11648b94ff85SPaolo Bonzini return bdrv_co_flush(bs->file); 116520d97356SBlue Swirl } 116620d97356SBlue Swirl 11677c80ab3fSJes Sorensen static int64_t qcow2_vm_state_offset(BDRVQcowState *s) 116820d97356SBlue Swirl { 116920d97356SBlue Swirl return (int64_t)s->l1_vm_state_index << (s->cluster_bits + s->l2_bits); 117020d97356SBlue Swirl } 117120d97356SBlue Swirl 11727c80ab3fSJes Sorensen static int qcow2_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) 117320d97356SBlue Swirl { 117420d97356SBlue Swirl BDRVQcowState *s = bs->opaque; 117520d97356SBlue Swirl bdi->cluster_size = s->cluster_size; 11767c80ab3fSJes Sorensen bdi->vm_state_offset = qcow2_vm_state_offset(s); 117720d97356SBlue Swirl return 0; 117820d97356SBlue Swirl } 117920d97356SBlue Swirl 118020d97356SBlue Swirl 11817c80ab3fSJes Sorensen static int qcow2_check(BlockDriverState *bs, BdrvCheckResult *result) 118220d97356SBlue Swirl { 11839ac228e0SKevin Wolf return qcow2_check_refcounts(bs, result); 118420d97356SBlue Swirl } 118520d97356SBlue Swirl 118620d97356SBlue Swirl #if 0 118720d97356SBlue Swirl static void dump_refcounts(BlockDriverState *bs) 118820d97356SBlue Swirl { 118920d97356SBlue Swirl BDRVQcowState *s = bs->opaque; 119020d97356SBlue Swirl int64_t nb_clusters, k, k1, size; 119120d97356SBlue Swirl int refcount; 119220d97356SBlue Swirl 119366f82ceeSKevin Wolf size = bdrv_getlength(bs->file); 119420d97356SBlue Swirl nb_clusters = size_to_clusters(s, size); 119520d97356SBlue Swirl for(k = 0; k < nb_clusters;) { 119620d97356SBlue Swirl k1 = k; 119720d97356SBlue Swirl refcount = get_refcount(bs, k); 119820d97356SBlue Swirl k++; 119920d97356SBlue Swirl while (k < nb_clusters && get_refcount(bs, k) == refcount) 120020d97356SBlue Swirl k++; 12010bfcd599SBlue Swirl printf("%" PRId64 ": refcount=%d nb=%" PRId64 "\n", k, refcount, 12020bfcd599SBlue Swirl k - k1); 120320d97356SBlue Swirl } 120420d97356SBlue Swirl } 120520d97356SBlue Swirl #endif 120620d97356SBlue Swirl 12077c80ab3fSJes Sorensen static int qcow2_save_vmstate(BlockDriverState *bs, const uint8_t *buf, 120820d97356SBlue Swirl int64_t pos, int size) 120920d97356SBlue Swirl { 121020d97356SBlue Swirl BDRVQcowState *s = bs->opaque; 121120d97356SBlue Swirl int growable = bs->growable; 121220d97356SBlue Swirl int ret; 121320d97356SBlue Swirl 121466f82ceeSKevin Wolf BLKDBG_EVENT(bs->file, BLKDBG_VMSTATE_SAVE); 121520d97356SBlue Swirl bs->growable = 1; 12167c80ab3fSJes Sorensen ret = bdrv_pwrite(bs, qcow2_vm_state_offset(s) + pos, buf, size); 121720d97356SBlue Swirl bs->growable = growable; 121820d97356SBlue Swirl 121920d97356SBlue Swirl return ret; 122020d97356SBlue Swirl } 122120d97356SBlue Swirl 12227c80ab3fSJes Sorensen static int qcow2_load_vmstate(BlockDriverState *bs, uint8_t *buf, 122320d97356SBlue Swirl int64_t pos, int size) 122420d97356SBlue Swirl { 122520d97356SBlue Swirl BDRVQcowState *s = bs->opaque; 122620d97356SBlue Swirl int growable = bs->growable; 122720d97356SBlue Swirl int ret; 122820d97356SBlue Swirl 122966f82ceeSKevin Wolf BLKDBG_EVENT(bs->file, BLKDBG_VMSTATE_LOAD); 123020d97356SBlue Swirl bs->growable = 1; 12317c80ab3fSJes Sorensen ret = bdrv_pread(bs, qcow2_vm_state_offset(s) + pos, buf, size); 123220d97356SBlue Swirl bs->growable = growable; 123320d97356SBlue Swirl 123420d97356SBlue Swirl return ret; 123520d97356SBlue Swirl } 123620d97356SBlue Swirl 12377c80ab3fSJes Sorensen static QEMUOptionParameter qcow2_create_options[] = { 123820d97356SBlue Swirl { 123920d97356SBlue Swirl .name = BLOCK_OPT_SIZE, 124020d97356SBlue Swirl .type = OPT_SIZE, 124120d97356SBlue Swirl .help = "Virtual disk size" 124220d97356SBlue Swirl }, 124320d97356SBlue Swirl { 124420d97356SBlue Swirl .name = BLOCK_OPT_BACKING_FILE, 124520d97356SBlue Swirl .type = OPT_STRING, 124620d97356SBlue Swirl .help = "File name of a base image" 124720d97356SBlue Swirl }, 124820d97356SBlue Swirl { 124920d97356SBlue Swirl .name = BLOCK_OPT_BACKING_FMT, 125020d97356SBlue Swirl .type = OPT_STRING, 125120d97356SBlue Swirl .help = "Image format of the base image" 125220d97356SBlue Swirl }, 125320d97356SBlue Swirl { 125420d97356SBlue Swirl .name = BLOCK_OPT_ENCRYPT, 125520d97356SBlue Swirl .type = OPT_FLAG, 125620d97356SBlue Swirl .help = "Encrypt the image" 125720d97356SBlue Swirl }, 125820d97356SBlue Swirl { 125920d97356SBlue Swirl .name = BLOCK_OPT_CLUSTER_SIZE, 126020d97356SBlue Swirl .type = OPT_SIZE, 126199cce9faSKevin Wolf .help = "qcow2 cluster size", 126299cce9faSKevin Wolf .value = { .n = DEFAULT_CLUSTER_SIZE }, 126320d97356SBlue Swirl }, 126420d97356SBlue Swirl { 126520d97356SBlue Swirl .name = BLOCK_OPT_PREALLOC, 126620d97356SBlue Swirl .type = OPT_STRING, 126720d97356SBlue Swirl .help = "Preallocation mode (allowed values: off, metadata)" 126820d97356SBlue Swirl }, 126920d97356SBlue Swirl { NULL } 127020d97356SBlue Swirl }; 127120d97356SBlue Swirl 127220d97356SBlue Swirl static BlockDriver bdrv_qcow2 = { 127320d97356SBlue Swirl .format_name = "qcow2", 127420d97356SBlue Swirl .instance_size = sizeof(BDRVQcowState), 12757c80ab3fSJes Sorensen .bdrv_probe = qcow2_probe, 12767c80ab3fSJes Sorensen .bdrv_open = qcow2_open, 12777c80ab3fSJes Sorensen .bdrv_close = qcow2_close, 12787c80ab3fSJes Sorensen .bdrv_create = qcow2_create, 12797c80ab3fSJes Sorensen .bdrv_is_allocated = qcow2_is_allocated, 12807c80ab3fSJes Sorensen .bdrv_set_key = qcow2_set_key, 12817c80ab3fSJes Sorensen .bdrv_make_empty = qcow2_make_empty, 128220d97356SBlue Swirl 128368d100e9SKevin Wolf .bdrv_co_readv = qcow2_co_readv, 128468d100e9SKevin Wolf .bdrv_co_writev = qcow2_co_writev, 1285eb489bb1SKevin Wolf .bdrv_co_flush_to_os = qcow2_co_flush_to_os, 1286eb489bb1SKevin Wolf .bdrv_co_flush_to_disk = qcow2_co_flush_to_disk, 1287419b19d9SStefan Hajnoczi 12886db39ae2SPaolo Bonzini .bdrv_co_discard = qcow2_co_discard, 1289419b19d9SStefan Hajnoczi .bdrv_truncate = qcow2_truncate, 12907c80ab3fSJes Sorensen .bdrv_write_compressed = qcow2_write_compressed, 129120d97356SBlue Swirl 129220d97356SBlue Swirl .bdrv_snapshot_create = qcow2_snapshot_create, 129320d97356SBlue Swirl .bdrv_snapshot_goto = qcow2_snapshot_goto, 129420d97356SBlue Swirl .bdrv_snapshot_delete = qcow2_snapshot_delete, 129520d97356SBlue Swirl .bdrv_snapshot_list = qcow2_snapshot_list, 129651ef6727Sedison .bdrv_snapshot_load_tmp = qcow2_snapshot_load_tmp, 12977c80ab3fSJes Sorensen .bdrv_get_info = qcow2_get_info, 129820d97356SBlue Swirl 12997c80ab3fSJes Sorensen .bdrv_save_vmstate = qcow2_save_vmstate, 13007c80ab3fSJes Sorensen .bdrv_load_vmstate = qcow2_load_vmstate, 130120d97356SBlue Swirl 130220d97356SBlue Swirl .bdrv_change_backing_file = qcow2_change_backing_file, 130320d97356SBlue Swirl 1304*06d9260fSAnthony Liguori .bdrv_invalidate_cache = qcow2_invalidate_cache, 1305*06d9260fSAnthony Liguori 13067c80ab3fSJes Sorensen .create_options = qcow2_create_options, 13077c80ab3fSJes Sorensen .bdrv_check = qcow2_check, 130820d97356SBlue Swirl }; 130920d97356SBlue Swirl 13105efa9d5aSAnthony Liguori static void bdrv_qcow2_init(void) 13115efa9d5aSAnthony Liguori { 13125efa9d5aSAnthony Liguori bdrv_register(&bdrv_qcow2); 13135efa9d5aSAnthony Liguori } 13145efa9d5aSAnthony Liguori 13155efa9d5aSAnthony Liguori block_init(bdrv_qcow2_init); 1316