1019d6b8fSAnthony Liguori /* 2019d6b8fSAnthony Liguori * Block driver for the QCOW format 3019d6b8fSAnthony Liguori * 4019d6b8fSAnthony Liguori * Copyright (c) 2004-2006 Fabrice Bellard 5019d6b8fSAnthony Liguori * 6019d6b8fSAnthony Liguori * Permission is hereby granted, free of charge, to any person obtaining a copy 7019d6b8fSAnthony Liguori * of this software and associated documentation files (the "Software"), to deal 8019d6b8fSAnthony Liguori * in the Software without restriction, including without limitation the rights 9019d6b8fSAnthony Liguori * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 10019d6b8fSAnthony Liguori * copies of the Software, and to permit persons to whom the Software is 11019d6b8fSAnthony Liguori * furnished to do so, subject to the following conditions: 12019d6b8fSAnthony Liguori * 13019d6b8fSAnthony Liguori * The above copyright notice and this permission notice shall be included in 14019d6b8fSAnthony Liguori * all copies or substantial portions of the Software. 15019d6b8fSAnthony Liguori * 16019d6b8fSAnthony Liguori * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 17019d6b8fSAnthony Liguori * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 18019d6b8fSAnthony Liguori * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 19019d6b8fSAnthony Liguori * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 20019d6b8fSAnthony Liguori * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 21019d6b8fSAnthony Liguori * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 22019d6b8fSAnthony Liguori * THE SOFTWARE. 23019d6b8fSAnthony Liguori */ 2480c71a24SPeter Maydell #include "qemu/osdep.h" 25da34e65cSMarkus Armbruster #include "qapi/error.h" 26019d6b8fSAnthony Liguori #include "qemu-common.h" 27e6ff69bfSDaniel P. Berrange #include "qemu/error-report.h" 28737e150eSPaolo Bonzini #include "block/block_int.h" 296af40160SKevin Wolf #include "sysemu/block-backend.h" 301de7afc9SPaolo Bonzini #include "qemu/module.h" 31019d6b8fSAnthony Liguori #include <zlib.h> 32cc7a8ea7SMarkus Armbruster #include "qapi/qmp/qerror.h" 33f6fa64f6SDaniel P. Berrange #include "crypto/cipher.h" 34caf71f86SPaolo Bonzini #include "migration/migration.h" 35019d6b8fSAnthony Liguori 36019d6b8fSAnthony Liguori /**************************************************************/ 37019d6b8fSAnthony Liguori /* QEMU COW block driver with compression and encryption support */ 38019d6b8fSAnthony Liguori 39019d6b8fSAnthony Liguori #define QCOW_MAGIC (('Q' << 24) | ('F' << 16) | ('I' << 8) | 0xfb) 40019d6b8fSAnthony Liguori #define QCOW_VERSION 1 41019d6b8fSAnthony Liguori 42019d6b8fSAnthony Liguori #define QCOW_CRYPT_NONE 0 43019d6b8fSAnthony Liguori #define QCOW_CRYPT_AES 1 44019d6b8fSAnthony Liguori 45019d6b8fSAnthony Liguori #define QCOW_OFLAG_COMPRESSED (1LL << 63) 46019d6b8fSAnthony Liguori 47019d6b8fSAnthony Liguori typedef struct QCowHeader { 48019d6b8fSAnthony Liguori uint32_t magic; 49019d6b8fSAnthony Liguori uint32_t version; 50019d6b8fSAnthony Liguori uint64_t backing_file_offset; 51019d6b8fSAnthony Liguori uint32_t backing_file_size; 52019d6b8fSAnthony Liguori uint32_t mtime; 53019d6b8fSAnthony Liguori uint64_t size; /* in bytes */ 54019d6b8fSAnthony Liguori uint8_t cluster_bits; 55019d6b8fSAnthony Liguori uint8_t l2_bits; 56ea54feffSKevin Wolf uint16_t padding; 57019d6b8fSAnthony Liguori uint32_t crypt_method; 58019d6b8fSAnthony Liguori uint64_t l1_table_offset; 59ea54feffSKevin Wolf } QEMU_PACKED QCowHeader; 60019d6b8fSAnthony Liguori 61019d6b8fSAnthony Liguori #define L2_CACHE_SIZE 16 62019d6b8fSAnthony Liguori 63019d6b8fSAnthony Liguori typedef struct BDRVQcowState { 64019d6b8fSAnthony Liguori int cluster_bits; 65019d6b8fSAnthony Liguori int cluster_size; 66019d6b8fSAnthony Liguori int cluster_sectors; 67019d6b8fSAnthony Liguori int l2_bits; 68019d6b8fSAnthony Liguori int l2_size; 6946485de0SKevin Wolf unsigned int l1_size; 70019d6b8fSAnthony Liguori uint64_t cluster_offset_mask; 71019d6b8fSAnthony Liguori uint64_t l1_table_offset; 72019d6b8fSAnthony Liguori uint64_t *l1_table; 73019d6b8fSAnthony Liguori uint64_t *l2_cache; 74019d6b8fSAnthony Liguori uint64_t l2_cache_offsets[L2_CACHE_SIZE]; 75019d6b8fSAnthony Liguori uint32_t l2_cache_counts[L2_CACHE_SIZE]; 76019d6b8fSAnthony Liguori uint8_t *cluster_cache; 77019d6b8fSAnthony Liguori uint8_t *cluster_data; 78019d6b8fSAnthony Liguori uint64_t cluster_cache_offset; 79f6fa64f6SDaniel P. Berrange QCryptoCipher *cipher; /* NULL if no key yet */ 80019d6b8fSAnthony Liguori uint32_t crypt_method_header; 8152b8eb60SKevin Wolf CoMutex lock; 82fd9f102cSKevin Wolf Error *migration_blocker; 83019d6b8fSAnthony Liguori } BDRVQcowState; 84019d6b8fSAnthony Liguori 8566f82ceeSKevin Wolf static int decompress_cluster(BlockDriverState *bs, uint64_t cluster_offset); 86019d6b8fSAnthony Liguori 87019d6b8fSAnthony Liguori static int qcow_probe(const uint8_t *buf, int buf_size, const char *filename) 88019d6b8fSAnthony Liguori { 89019d6b8fSAnthony Liguori const QCowHeader *cow_header = (const void *)buf; 90019d6b8fSAnthony Liguori 91019d6b8fSAnthony Liguori if (buf_size >= sizeof(QCowHeader) && 92019d6b8fSAnthony Liguori be32_to_cpu(cow_header->magic) == QCOW_MAGIC && 93019d6b8fSAnthony Liguori be32_to_cpu(cow_header->version) == QCOW_VERSION) 94019d6b8fSAnthony Liguori return 100; 95019d6b8fSAnthony Liguori else 96019d6b8fSAnthony Liguori return 0; 97019d6b8fSAnthony Liguori } 98019d6b8fSAnthony Liguori 99015a1036SMax Reitz static int qcow_open(BlockDriverState *bs, QDict *options, int flags, 100015a1036SMax Reitz Error **errp) 101019d6b8fSAnthony Liguori { 102019d6b8fSAnthony Liguori BDRVQcowState *s = bs->opaque; 103d66e5ceeSKevin Wolf unsigned int len, i, shift; 104d66e5ceeSKevin Wolf int ret; 105019d6b8fSAnthony Liguori QCowHeader header; 106019d6b8fSAnthony Liguori 1079a4f4c31SKevin Wolf ret = bdrv_pread(bs->file->bs, 0, &header, sizeof(header)); 10884b0ec02SLi Zhi Hui if (ret < 0) { 109019d6b8fSAnthony Liguori goto fail; 11084b0ec02SLi Zhi Hui } 111019d6b8fSAnthony Liguori be32_to_cpus(&header.magic); 112019d6b8fSAnthony Liguori be32_to_cpus(&header.version); 113019d6b8fSAnthony Liguori be64_to_cpus(&header.backing_file_offset); 114019d6b8fSAnthony Liguori be32_to_cpus(&header.backing_file_size); 115019d6b8fSAnthony Liguori be32_to_cpus(&header.mtime); 116019d6b8fSAnthony Liguori be64_to_cpus(&header.size); 117019d6b8fSAnthony Liguori be32_to_cpus(&header.crypt_method); 118019d6b8fSAnthony Liguori be64_to_cpus(&header.l1_table_offset); 119019d6b8fSAnthony Liguori 12084b0ec02SLi Zhi Hui if (header.magic != QCOW_MAGIC) { 12176abe407SPaolo Bonzini error_setg(errp, "Image not in qcow format"); 12276abe407SPaolo Bonzini ret = -EINVAL; 123019d6b8fSAnthony Liguori goto fail; 12484b0ec02SLi Zhi Hui } 12584b0ec02SLi Zhi Hui if (header.version != QCOW_VERSION) { 126a55448b3SMax Reitz error_setg(errp, "Unsupported qcow version %" PRIu32, header.version); 12784b0ec02SLi Zhi Hui ret = -ENOTSUP; 128019d6b8fSAnthony Liguori goto fail; 12984b0ec02SLi Zhi Hui } 13084b0ec02SLi Zhi Hui 1317159a45bSKevin Wolf if (header.size <= 1) { 1327159a45bSKevin Wolf error_setg(errp, "Image size is too small (must be at least 2 bytes)"); 13384b0ec02SLi Zhi Hui ret = -EINVAL; 134019d6b8fSAnthony Liguori goto fail; 13584b0ec02SLi Zhi Hui } 1367159a45bSKevin Wolf if (header.cluster_bits < 9 || header.cluster_bits > 16) { 1377159a45bSKevin Wolf error_setg(errp, "Cluster size must be between 512 and 64k"); 1387159a45bSKevin Wolf ret = -EINVAL; 1397159a45bSKevin Wolf goto fail; 1407159a45bSKevin Wolf } 1417159a45bSKevin Wolf 14242eb5817SKevin Wolf /* l2_bits specifies number of entries; storing a uint64_t in each entry, 14342eb5817SKevin Wolf * so bytes = num_entries << 3. */ 14442eb5817SKevin Wolf if (header.l2_bits < 9 - 3 || header.l2_bits > 16 - 3) { 14542eb5817SKevin Wolf error_setg(errp, "L2 table size must be between 512 and 64k"); 14642eb5817SKevin Wolf ret = -EINVAL; 14742eb5817SKevin Wolf goto fail; 14842eb5817SKevin Wolf } 14942eb5817SKevin Wolf 15084b0ec02SLi Zhi Hui if (header.crypt_method > QCOW_CRYPT_AES) { 151b6d5066dSPaolo Bonzini error_setg(errp, "invalid encryption method in qcow header"); 15284b0ec02SLi Zhi Hui ret = -EINVAL; 15384b0ec02SLi Zhi Hui goto fail; 15484b0ec02SLi Zhi Hui } 155f6fa64f6SDaniel P. Berrange if (!qcrypto_cipher_supports(QCRYPTO_CIPHER_ALG_AES_128)) { 156f6fa64f6SDaniel P. Berrange error_setg(errp, "AES cipher not available"); 157f6fa64f6SDaniel P. Berrange ret = -EINVAL; 158f6fa64f6SDaniel P. Berrange goto fail; 159f6fa64f6SDaniel P. Berrange } 160019d6b8fSAnthony Liguori s->crypt_method_header = header.crypt_method; 16184b0ec02SLi Zhi Hui if (s->crypt_method_header) { 162e6ff69bfSDaniel P. Berrange if (bdrv_uses_whitelist() && 163e6ff69bfSDaniel P. Berrange s->crypt_method_header == QCOW_CRYPT_AES) { 164e6ff69bfSDaniel P. Berrange error_report("qcow built-in AES encryption is deprecated"); 165e6ff69bfSDaniel P. Berrange error_printf("Support for it will be removed in a future release.\n" 166e6ff69bfSDaniel P. Berrange "You can use 'qemu-img convert' to switch to an\n" 167e6ff69bfSDaniel P. Berrange "unencrypted qcow image, or a LUKS raw image.\n"); 168e6ff69bfSDaniel P. Berrange } 169e6ff69bfSDaniel P. Berrange 170019d6b8fSAnthony Liguori bs->encrypted = 1; 17184b0ec02SLi Zhi Hui } 172019d6b8fSAnthony Liguori s->cluster_bits = header.cluster_bits; 173019d6b8fSAnthony Liguori s->cluster_size = 1 << s->cluster_bits; 174019d6b8fSAnthony Liguori s->cluster_sectors = 1 << (s->cluster_bits - 9); 175019d6b8fSAnthony Liguori s->l2_bits = header.l2_bits; 176019d6b8fSAnthony Liguori s->l2_size = 1 << s->l2_bits; 177019d6b8fSAnthony Liguori bs->total_sectors = header.size / 512; 178019d6b8fSAnthony Liguori s->cluster_offset_mask = (1LL << (63 - s->cluster_bits)) - 1; 179019d6b8fSAnthony Liguori 180019d6b8fSAnthony Liguori /* read the level 1 table */ 181019d6b8fSAnthony Liguori shift = s->cluster_bits + s->l2_bits; 18246485de0SKevin Wolf if (header.size > UINT64_MAX - (1LL << shift)) { 18346485de0SKevin Wolf error_setg(errp, "Image too large"); 18446485de0SKevin Wolf ret = -EINVAL; 18546485de0SKevin Wolf goto fail; 18646485de0SKevin Wolf } else { 18746485de0SKevin Wolf uint64_t l1_size = (header.size + (1LL << shift) - 1) >> shift; 18846485de0SKevin Wolf if (l1_size > INT_MAX / sizeof(uint64_t)) { 18946485de0SKevin Wolf error_setg(errp, "Image too large"); 19046485de0SKevin Wolf ret = -EINVAL; 19146485de0SKevin Wolf goto fail; 19246485de0SKevin Wolf } 19346485de0SKevin Wolf s->l1_size = l1_size; 19446485de0SKevin Wolf } 195019d6b8fSAnthony Liguori 196019d6b8fSAnthony Liguori s->l1_table_offset = header.l1_table_offset; 1975839e53bSMarkus Armbruster s->l1_table = g_try_new(uint64_t, s->l1_size); 1980df93305SKevin Wolf if (s->l1_table == NULL) { 1990df93305SKevin Wolf error_setg(errp, "Could not allocate memory for L1 table"); 2000df93305SKevin Wolf ret = -ENOMEM; 2010df93305SKevin Wolf goto fail; 2020df93305SKevin Wolf } 20384b0ec02SLi Zhi Hui 2049a4f4c31SKevin Wolf ret = bdrv_pread(bs->file->bs, s->l1_table_offset, s->l1_table, 20584b0ec02SLi Zhi Hui s->l1_size * sizeof(uint64_t)); 20684b0ec02SLi Zhi Hui if (ret < 0) { 207019d6b8fSAnthony Liguori goto fail; 20884b0ec02SLi Zhi Hui } 20984b0ec02SLi Zhi Hui 210019d6b8fSAnthony Liguori for(i = 0;i < s->l1_size; i++) { 211019d6b8fSAnthony Liguori be64_to_cpus(&s->l1_table[i]); 212019d6b8fSAnthony Liguori } 2130df93305SKevin Wolf 2140df93305SKevin Wolf /* alloc L2 cache (max. 64k * 16 * 8 = 8 MB) */ 2150df93305SKevin Wolf s->l2_cache = 2169a4f4c31SKevin Wolf qemu_try_blockalign(bs->file->bs, 2170df93305SKevin Wolf s->l2_size * L2_CACHE_SIZE * sizeof(uint64_t)); 2180df93305SKevin Wolf if (s->l2_cache == NULL) { 2190df93305SKevin Wolf error_setg(errp, "Could not allocate L2 table cache"); 2200df93305SKevin Wolf ret = -ENOMEM; 2210df93305SKevin Wolf goto fail; 2220df93305SKevin Wolf } 2237267c094SAnthony Liguori s->cluster_cache = g_malloc(s->cluster_size); 2247267c094SAnthony Liguori s->cluster_data = g_malloc(s->cluster_size); 225019d6b8fSAnthony Liguori s->cluster_cache_offset = -1; 226019d6b8fSAnthony Liguori 227019d6b8fSAnthony Liguori /* read the backing file name */ 228019d6b8fSAnthony Liguori if (header.backing_file_offset != 0) { 229019d6b8fSAnthony Liguori len = header.backing_file_size; 230e729fa6aSJeff Cody if (len > 1023 || len >= sizeof(bs->backing_file)) { 231d66e5ceeSKevin Wolf error_setg(errp, "Backing file name too long"); 232d66e5ceeSKevin Wolf ret = -EINVAL; 233d66e5ceeSKevin Wolf goto fail; 23484b0ec02SLi Zhi Hui } 2359a4f4c31SKevin Wolf ret = bdrv_pread(bs->file->bs, header.backing_file_offset, 23684b0ec02SLi Zhi Hui bs->backing_file, len); 23784b0ec02SLi Zhi Hui if (ret < 0) { 238019d6b8fSAnthony Liguori goto fail; 23984b0ec02SLi Zhi Hui } 240019d6b8fSAnthony Liguori bs->backing_file[len] = '\0'; 241019d6b8fSAnthony Liguori } 242de33b1f3SScott Wood 243fd9f102cSKevin Wolf /* Disable migration when qcow images are used */ 24481e5f78aSAlberto Garcia error_setg(&s->migration_blocker, "The qcow format used by node '%s' " 24581e5f78aSAlberto Garcia "does not support live migration", 24681e5f78aSAlberto Garcia bdrv_get_device_or_node_name(bs)); 247fd9f102cSKevin Wolf migrate_add_blocker(s->migration_blocker); 248fd9f102cSKevin Wolf 249de33b1f3SScott Wood qemu_co_mutex_init(&s->lock); 250019d6b8fSAnthony Liguori return 0; 251019d6b8fSAnthony Liguori 252019d6b8fSAnthony Liguori fail: 2537267c094SAnthony Liguori g_free(s->l1_table); 2540df93305SKevin Wolf qemu_vfree(s->l2_cache); 2557267c094SAnthony Liguori g_free(s->cluster_cache); 2567267c094SAnthony Liguori g_free(s->cluster_data); 25784b0ec02SLi Zhi Hui return ret; 258019d6b8fSAnthony Liguori } 259019d6b8fSAnthony Liguori 260d177692eSJeff Cody 261d177692eSJeff Cody /* We have nothing to do for QCOW reopen, stubs just return 262d177692eSJeff Cody * success */ 263d177692eSJeff Cody static int qcow_reopen_prepare(BDRVReopenState *state, 264d177692eSJeff Cody BlockReopenQueue *queue, Error **errp) 265d177692eSJeff Cody { 266d177692eSJeff Cody return 0; 267d177692eSJeff Cody } 268d177692eSJeff Cody 269019d6b8fSAnthony Liguori static int qcow_set_key(BlockDriverState *bs, const char *key) 270019d6b8fSAnthony Liguori { 271019d6b8fSAnthony Liguori BDRVQcowState *s = bs->opaque; 272019d6b8fSAnthony Liguori uint8_t keybuf[16]; 273019d6b8fSAnthony Liguori int len, i; 274f6fa64f6SDaniel P. Berrange Error *err; 275019d6b8fSAnthony Liguori 276019d6b8fSAnthony Liguori memset(keybuf, 0, 16); 277019d6b8fSAnthony Liguori len = strlen(key); 278019d6b8fSAnthony Liguori if (len > 16) 279019d6b8fSAnthony Liguori len = 16; 280019d6b8fSAnthony Liguori /* XXX: we could compress the chars to 7 bits to increase 281019d6b8fSAnthony Liguori entropy */ 282019d6b8fSAnthony Liguori for(i = 0;i < len;i++) { 283019d6b8fSAnthony Liguori keybuf[i] = key[i]; 284019d6b8fSAnthony Liguori } 2858336aafaSDaniel P. Berrange assert(bs->encrypted); 286019d6b8fSAnthony Liguori 287f6fa64f6SDaniel P. Berrange qcrypto_cipher_free(s->cipher); 288f6fa64f6SDaniel P. Berrange s->cipher = qcrypto_cipher_new( 289f6fa64f6SDaniel P. Berrange QCRYPTO_CIPHER_ALG_AES_128, 290f6fa64f6SDaniel P. Berrange QCRYPTO_CIPHER_MODE_CBC, 291f6fa64f6SDaniel P. Berrange keybuf, G_N_ELEMENTS(keybuf), 292f6fa64f6SDaniel P. Berrange &err); 293f6fa64f6SDaniel P. Berrange 294f6fa64f6SDaniel P. Berrange if (!s->cipher) { 295f6fa64f6SDaniel P. Berrange /* XXX would be nice if errors in this method could 296f6fa64f6SDaniel P. Berrange * be properly propagate to the caller. Would need 297f6fa64f6SDaniel P. Berrange * the bdrv_set_key() API signature to be fixed. */ 298f6fa64f6SDaniel P. Berrange error_free(err); 299019d6b8fSAnthony Liguori return -1; 300f6fa64f6SDaniel P. Berrange } 301019d6b8fSAnthony Liguori return 0; 302019d6b8fSAnthony Liguori } 303019d6b8fSAnthony Liguori 304019d6b8fSAnthony Liguori /* The crypt function is compatible with the linux cryptoloop 305019d6b8fSAnthony Liguori algorithm for < 4 GB images. NOTE: out_buf == in_buf is 306019d6b8fSAnthony Liguori supported */ 307f6fa64f6SDaniel P. Berrange static int encrypt_sectors(BDRVQcowState *s, int64_t sector_num, 308019d6b8fSAnthony Liguori uint8_t *out_buf, const uint8_t *in_buf, 309f6fa64f6SDaniel P. Berrange int nb_sectors, bool enc, Error **errp) 310019d6b8fSAnthony Liguori { 311019d6b8fSAnthony Liguori union { 312019d6b8fSAnthony Liguori uint64_t ll[2]; 313019d6b8fSAnthony Liguori uint8_t b[16]; 314019d6b8fSAnthony Liguori } ivec; 315019d6b8fSAnthony Liguori int i; 316f6fa64f6SDaniel P. Berrange int ret; 317019d6b8fSAnthony Liguori 318019d6b8fSAnthony Liguori for(i = 0; i < nb_sectors; i++) { 319019d6b8fSAnthony Liguori ivec.ll[0] = cpu_to_le64(sector_num); 320019d6b8fSAnthony Liguori ivec.ll[1] = 0; 321f6fa64f6SDaniel P. Berrange if (qcrypto_cipher_setiv(s->cipher, 322f6fa64f6SDaniel P. Berrange ivec.b, G_N_ELEMENTS(ivec.b), 323f6fa64f6SDaniel P. Berrange errp) < 0) { 324f6fa64f6SDaniel P. Berrange return -1; 325f6fa64f6SDaniel P. Berrange } 326f6fa64f6SDaniel P. Berrange if (enc) { 327f6fa64f6SDaniel P. Berrange ret = qcrypto_cipher_encrypt(s->cipher, 328f6fa64f6SDaniel P. Berrange in_buf, 329f6fa64f6SDaniel P. Berrange out_buf, 330f6fa64f6SDaniel P. Berrange 512, 331f6fa64f6SDaniel P. Berrange errp); 332f6fa64f6SDaniel P. Berrange } else { 333f6fa64f6SDaniel P. Berrange ret = qcrypto_cipher_decrypt(s->cipher, 334f6fa64f6SDaniel P. Berrange in_buf, 335f6fa64f6SDaniel P. Berrange out_buf, 336f6fa64f6SDaniel P. Berrange 512, 337f6fa64f6SDaniel P. Berrange errp); 338f6fa64f6SDaniel P. Berrange } 339f6fa64f6SDaniel P. Berrange if (ret < 0) { 340f6fa64f6SDaniel P. Berrange return -1; 341f6fa64f6SDaniel P. Berrange } 342019d6b8fSAnthony Liguori sector_num++; 343019d6b8fSAnthony Liguori in_buf += 512; 344019d6b8fSAnthony Liguori out_buf += 512; 345019d6b8fSAnthony Liguori } 346f6fa64f6SDaniel P. Berrange return 0; 347019d6b8fSAnthony Liguori } 348019d6b8fSAnthony Liguori 349019d6b8fSAnthony Liguori /* 'allocate' is: 350019d6b8fSAnthony Liguori * 351019d6b8fSAnthony Liguori * 0 to not allocate. 352019d6b8fSAnthony Liguori * 353019d6b8fSAnthony Liguori * 1 to allocate a normal cluster (for sector indexes 'n_start' to 354019d6b8fSAnthony Liguori * 'n_end') 355019d6b8fSAnthony Liguori * 356019d6b8fSAnthony Liguori * 2 to allocate a compressed cluster of size 357019d6b8fSAnthony Liguori * 'compressed_size'. 'compressed_size' must be > 0 and < 358019d6b8fSAnthony Liguori * cluster_size 359019d6b8fSAnthony Liguori * 360019d6b8fSAnthony Liguori * return 0 if not allocated. 361019d6b8fSAnthony Liguori */ 362019d6b8fSAnthony Liguori static uint64_t get_cluster_offset(BlockDriverState *bs, 363019d6b8fSAnthony Liguori uint64_t offset, int allocate, 364019d6b8fSAnthony Liguori int compressed_size, 365019d6b8fSAnthony Liguori int n_start, int n_end) 366019d6b8fSAnthony Liguori { 367019d6b8fSAnthony Liguori BDRVQcowState *s = bs->opaque; 368019d6b8fSAnthony Liguori int min_index, i, j, l1_index, l2_index; 369019d6b8fSAnthony Liguori uint64_t l2_offset, *l2_table, cluster_offset, tmp; 370019d6b8fSAnthony Liguori uint32_t min_count; 371019d6b8fSAnthony Liguori int new_l2_table; 372019d6b8fSAnthony Liguori 373019d6b8fSAnthony Liguori l1_index = offset >> (s->l2_bits + s->cluster_bits); 374019d6b8fSAnthony Liguori l2_offset = s->l1_table[l1_index]; 375019d6b8fSAnthony Liguori new_l2_table = 0; 376019d6b8fSAnthony Liguori if (!l2_offset) { 377019d6b8fSAnthony Liguori if (!allocate) 378019d6b8fSAnthony Liguori return 0; 379019d6b8fSAnthony Liguori /* allocate a new l2 entry */ 3809a4f4c31SKevin Wolf l2_offset = bdrv_getlength(bs->file->bs); 381019d6b8fSAnthony Liguori /* round to cluster size */ 382019d6b8fSAnthony Liguori l2_offset = (l2_offset + s->cluster_size - 1) & ~(s->cluster_size - 1); 383019d6b8fSAnthony Liguori /* update the L1 entry */ 384019d6b8fSAnthony Liguori s->l1_table[l1_index] = l2_offset; 385019d6b8fSAnthony Liguori tmp = cpu_to_be64(l2_offset); 3869a4f4c31SKevin Wolf if (bdrv_pwrite_sync(bs->file->bs, 3875e5557d9SKevin Wolf s->l1_table_offset + l1_index * sizeof(tmp), 3885e5557d9SKevin Wolf &tmp, sizeof(tmp)) < 0) 389019d6b8fSAnthony Liguori return 0; 390019d6b8fSAnthony Liguori new_l2_table = 1; 391019d6b8fSAnthony Liguori } 392019d6b8fSAnthony Liguori for(i = 0; i < L2_CACHE_SIZE; i++) { 393019d6b8fSAnthony Liguori if (l2_offset == s->l2_cache_offsets[i]) { 394019d6b8fSAnthony Liguori /* increment the hit count */ 395019d6b8fSAnthony Liguori if (++s->l2_cache_counts[i] == 0xffffffff) { 396019d6b8fSAnthony Liguori for(j = 0; j < L2_CACHE_SIZE; j++) { 397019d6b8fSAnthony Liguori s->l2_cache_counts[j] >>= 1; 398019d6b8fSAnthony Liguori } 399019d6b8fSAnthony Liguori } 400019d6b8fSAnthony Liguori l2_table = s->l2_cache + (i << s->l2_bits); 401019d6b8fSAnthony Liguori goto found; 402019d6b8fSAnthony Liguori } 403019d6b8fSAnthony Liguori } 404019d6b8fSAnthony Liguori /* not found: load a new entry in the least used one */ 405019d6b8fSAnthony Liguori min_index = 0; 406019d6b8fSAnthony Liguori min_count = 0xffffffff; 407019d6b8fSAnthony Liguori for(i = 0; i < L2_CACHE_SIZE; i++) { 408019d6b8fSAnthony Liguori if (s->l2_cache_counts[i] < min_count) { 409019d6b8fSAnthony Liguori min_count = s->l2_cache_counts[i]; 410019d6b8fSAnthony Liguori min_index = i; 411019d6b8fSAnthony Liguori } 412019d6b8fSAnthony Liguori } 413019d6b8fSAnthony Liguori l2_table = s->l2_cache + (min_index << s->l2_bits); 414019d6b8fSAnthony Liguori if (new_l2_table) { 415019d6b8fSAnthony Liguori memset(l2_table, 0, s->l2_size * sizeof(uint64_t)); 4169a4f4c31SKevin Wolf if (bdrv_pwrite_sync(bs->file->bs, l2_offset, l2_table, 4175e5557d9SKevin Wolf s->l2_size * sizeof(uint64_t)) < 0) 418019d6b8fSAnthony Liguori return 0; 419019d6b8fSAnthony Liguori } else { 4209a4f4c31SKevin Wolf if (bdrv_pread(bs->file->bs, l2_offset, l2_table, 4219a4f4c31SKevin Wolf s->l2_size * sizeof(uint64_t)) != 422019d6b8fSAnthony Liguori s->l2_size * sizeof(uint64_t)) 423019d6b8fSAnthony Liguori return 0; 424019d6b8fSAnthony Liguori } 425019d6b8fSAnthony Liguori s->l2_cache_offsets[min_index] = l2_offset; 426019d6b8fSAnthony Liguori s->l2_cache_counts[min_index] = 1; 427019d6b8fSAnthony Liguori found: 428019d6b8fSAnthony Liguori l2_index = (offset >> s->cluster_bits) & (s->l2_size - 1); 429019d6b8fSAnthony Liguori cluster_offset = be64_to_cpu(l2_table[l2_index]); 430019d6b8fSAnthony Liguori if (!cluster_offset || 431019d6b8fSAnthony Liguori ((cluster_offset & QCOW_OFLAG_COMPRESSED) && allocate == 1)) { 432019d6b8fSAnthony Liguori if (!allocate) 433019d6b8fSAnthony Liguori return 0; 434019d6b8fSAnthony Liguori /* allocate a new cluster */ 435019d6b8fSAnthony Liguori if ((cluster_offset & QCOW_OFLAG_COMPRESSED) && 436019d6b8fSAnthony Liguori (n_end - n_start) < s->cluster_sectors) { 437019d6b8fSAnthony Liguori /* if the cluster is already compressed, we must 438019d6b8fSAnthony Liguori decompress it in the case it is not completely 439019d6b8fSAnthony Liguori overwritten */ 44066f82ceeSKevin Wolf if (decompress_cluster(bs, cluster_offset) < 0) 441019d6b8fSAnthony Liguori return 0; 4429a4f4c31SKevin Wolf cluster_offset = bdrv_getlength(bs->file->bs); 443019d6b8fSAnthony Liguori cluster_offset = (cluster_offset + s->cluster_size - 1) & 444019d6b8fSAnthony Liguori ~(s->cluster_size - 1); 445019d6b8fSAnthony Liguori /* write the cluster content */ 4469a4f4c31SKevin Wolf if (bdrv_pwrite(bs->file->bs, cluster_offset, s->cluster_cache, 4479a4f4c31SKevin Wolf s->cluster_size) != 448019d6b8fSAnthony Liguori s->cluster_size) 449019d6b8fSAnthony Liguori return -1; 450019d6b8fSAnthony Liguori } else { 4519a4f4c31SKevin Wolf cluster_offset = bdrv_getlength(bs->file->bs); 452019d6b8fSAnthony Liguori if (allocate == 1) { 453019d6b8fSAnthony Liguori /* round to cluster size */ 454019d6b8fSAnthony Liguori cluster_offset = (cluster_offset + s->cluster_size - 1) & 455019d6b8fSAnthony Liguori ~(s->cluster_size - 1); 4569a4f4c31SKevin Wolf bdrv_truncate(bs->file->bs, cluster_offset + s->cluster_size); 457019d6b8fSAnthony Liguori /* if encrypted, we must initialize the cluster 458019d6b8fSAnthony Liguori content which won't be written */ 4598336aafaSDaniel P. Berrange if (bs->encrypted && 460019d6b8fSAnthony Liguori (n_end - n_start) < s->cluster_sectors) { 461019d6b8fSAnthony Liguori uint64_t start_sect; 462f6fa64f6SDaniel P. Berrange assert(s->cipher); 463019d6b8fSAnthony Liguori start_sect = (offset & ~(s->cluster_size - 1)) >> 9; 464019d6b8fSAnthony Liguori memset(s->cluster_data + 512, 0x00, 512); 465019d6b8fSAnthony Liguori for(i = 0; i < s->cluster_sectors; i++) { 466019d6b8fSAnthony Liguori if (i < n_start || i >= n_end) { 467f6fa64f6SDaniel P. Berrange Error *err = NULL; 468f6fa64f6SDaniel P. Berrange if (encrypt_sectors(s, start_sect + i, 469019d6b8fSAnthony Liguori s->cluster_data, 470f6fa64f6SDaniel P. Berrange s->cluster_data + 512, 1, 471f6fa64f6SDaniel P. Berrange true, &err) < 0) { 472f6fa64f6SDaniel P. Berrange error_free(err); 473f6fa64f6SDaniel P. Berrange errno = EIO; 474f6fa64f6SDaniel P. Berrange return -1; 475f6fa64f6SDaniel P. Berrange } 4769a4f4c31SKevin Wolf if (bdrv_pwrite(bs->file->bs, 4779a4f4c31SKevin Wolf cluster_offset + i * 512, 478019d6b8fSAnthony Liguori s->cluster_data, 512) != 512) 479019d6b8fSAnthony Liguori return -1; 480019d6b8fSAnthony Liguori } 481019d6b8fSAnthony Liguori } 482019d6b8fSAnthony Liguori } 483019d6b8fSAnthony Liguori } else if (allocate == 2) { 484019d6b8fSAnthony Liguori cluster_offset |= QCOW_OFLAG_COMPRESSED | 485019d6b8fSAnthony Liguori (uint64_t)compressed_size << (63 - s->cluster_bits); 486019d6b8fSAnthony Liguori } 487019d6b8fSAnthony Liguori } 488019d6b8fSAnthony Liguori /* update L2 table */ 489019d6b8fSAnthony Liguori tmp = cpu_to_be64(cluster_offset); 490019d6b8fSAnthony Liguori l2_table[l2_index] = tmp; 4919a4f4c31SKevin Wolf if (bdrv_pwrite_sync(bs->file->bs, l2_offset + l2_index * sizeof(tmp), 4925e5557d9SKevin Wolf &tmp, sizeof(tmp)) < 0) 493019d6b8fSAnthony Liguori return 0; 494019d6b8fSAnthony Liguori } 495019d6b8fSAnthony Liguori return cluster_offset; 496019d6b8fSAnthony Liguori } 497019d6b8fSAnthony Liguori 498b6b8a333SPaolo Bonzini static int64_t coroutine_fn qcow_co_get_block_status(BlockDriverState *bs, 49967a0fd2aSFam Zheng int64_t sector_num, int nb_sectors, int *pnum, BlockDriverState **file) 500019d6b8fSAnthony Liguori { 501019d6b8fSAnthony Liguori BDRVQcowState *s = bs->opaque; 502019d6b8fSAnthony Liguori int index_in_cluster, n; 503019d6b8fSAnthony Liguori uint64_t cluster_offset; 504019d6b8fSAnthony Liguori 505f8a2e5e3SStefan Hajnoczi qemu_co_mutex_lock(&s->lock); 506019d6b8fSAnthony Liguori cluster_offset = get_cluster_offset(bs, sector_num << 9, 0, 0, 0, 0); 507f8a2e5e3SStefan Hajnoczi qemu_co_mutex_unlock(&s->lock); 508019d6b8fSAnthony Liguori index_in_cluster = sector_num & (s->cluster_sectors - 1); 509019d6b8fSAnthony Liguori n = s->cluster_sectors - index_in_cluster; 510019d6b8fSAnthony Liguori if (n > nb_sectors) 511019d6b8fSAnthony Liguori n = nb_sectors; 512019d6b8fSAnthony Liguori *pnum = n; 5134bc74be9SPaolo Bonzini if (!cluster_offset) { 5144bc74be9SPaolo Bonzini return 0; 5154bc74be9SPaolo Bonzini } 516f6fa64f6SDaniel P. Berrange if ((cluster_offset & QCOW_OFLAG_COMPRESSED) || s->cipher) { 5174bc74be9SPaolo Bonzini return BDRV_BLOCK_DATA; 5184bc74be9SPaolo Bonzini } 5194bc74be9SPaolo Bonzini cluster_offset |= (index_in_cluster << BDRV_SECTOR_BITS); 5203064bf6fSFam Zheng *file = bs->file->bs; 5214bc74be9SPaolo Bonzini return BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID | cluster_offset; 522019d6b8fSAnthony Liguori } 523019d6b8fSAnthony Liguori 524019d6b8fSAnthony Liguori static int decompress_buffer(uint8_t *out_buf, int out_buf_size, 525019d6b8fSAnthony Liguori const uint8_t *buf, int buf_size) 526019d6b8fSAnthony Liguori { 527019d6b8fSAnthony Liguori z_stream strm1, *strm = &strm1; 528019d6b8fSAnthony Liguori int ret, out_len; 529019d6b8fSAnthony Liguori 530019d6b8fSAnthony Liguori memset(strm, 0, sizeof(*strm)); 531019d6b8fSAnthony Liguori 532019d6b8fSAnthony Liguori strm->next_in = (uint8_t *)buf; 533019d6b8fSAnthony Liguori strm->avail_in = buf_size; 534019d6b8fSAnthony Liguori strm->next_out = out_buf; 535019d6b8fSAnthony Liguori strm->avail_out = out_buf_size; 536019d6b8fSAnthony Liguori 537019d6b8fSAnthony Liguori ret = inflateInit2(strm, -12); 538019d6b8fSAnthony Liguori if (ret != Z_OK) 539019d6b8fSAnthony Liguori return -1; 540019d6b8fSAnthony Liguori ret = inflate(strm, Z_FINISH); 541019d6b8fSAnthony Liguori out_len = strm->next_out - out_buf; 542019d6b8fSAnthony Liguori if ((ret != Z_STREAM_END && ret != Z_BUF_ERROR) || 543019d6b8fSAnthony Liguori out_len != out_buf_size) { 544019d6b8fSAnthony Liguori inflateEnd(strm); 545019d6b8fSAnthony Liguori return -1; 546019d6b8fSAnthony Liguori } 547019d6b8fSAnthony Liguori inflateEnd(strm); 548019d6b8fSAnthony Liguori return 0; 549019d6b8fSAnthony Liguori } 550019d6b8fSAnthony Liguori 55166f82ceeSKevin Wolf static int decompress_cluster(BlockDriverState *bs, uint64_t cluster_offset) 552019d6b8fSAnthony Liguori { 55366f82ceeSKevin Wolf BDRVQcowState *s = bs->opaque; 554019d6b8fSAnthony Liguori int ret, csize; 555019d6b8fSAnthony Liguori uint64_t coffset; 556019d6b8fSAnthony Liguori 557019d6b8fSAnthony Liguori coffset = cluster_offset & s->cluster_offset_mask; 558019d6b8fSAnthony Liguori if (s->cluster_cache_offset != coffset) { 559019d6b8fSAnthony Liguori csize = cluster_offset >> (63 - s->cluster_bits); 560019d6b8fSAnthony Liguori csize &= (s->cluster_size - 1); 5619a4f4c31SKevin Wolf ret = bdrv_pread(bs->file->bs, coffset, s->cluster_data, csize); 562019d6b8fSAnthony Liguori if (ret != csize) 563019d6b8fSAnthony Liguori return -1; 564019d6b8fSAnthony Liguori if (decompress_buffer(s->cluster_cache, s->cluster_size, 565019d6b8fSAnthony Liguori s->cluster_data, csize) < 0) { 566019d6b8fSAnthony Liguori return -1; 567019d6b8fSAnthony Liguori } 568019d6b8fSAnthony Liguori s->cluster_cache_offset = coffset; 569019d6b8fSAnthony Liguori } 570019d6b8fSAnthony Liguori return 0; 571019d6b8fSAnthony Liguori } 572019d6b8fSAnthony Liguori 573a968168cSDong Xu Wang static coroutine_fn int qcow_co_readv(BlockDriverState *bs, int64_t sector_num, 57427deebe8SFrediano Ziglio int nb_sectors, QEMUIOVector *qiov) 575ad53089bSChristoph Hellwig { 576019d6b8fSAnthony Liguori BDRVQcowState *s = bs->opaque; 577019d6b8fSAnthony Liguori int index_in_cluster; 57827deebe8SFrediano Ziglio int ret = 0, n; 57943ca85b5SFrediano Ziglio uint64_t cluster_offset; 580430bbaaaSFrediano Ziglio struct iovec hd_iov; 581430bbaaaSFrediano Ziglio QEMUIOVector hd_qiov; 58227deebe8SFrediano Ziglio uint8_t *buf; 58327deebe8SFrediano Ziglio void *orig_buf; 584f6fa64f6SDaniel P. Berrange Error *err = NULL; 585019d6b8fSAnthony Liguori 58627deebe8SFrediano Ziglio if (qiov->niov > 1) { 5870df93305SKevin Wolf buf = orig_buf = qemu_try_blockalign(bs, qiov->size); 5880df93305SKevin Wolf if (buf == NULL) { 5890df93305SKevin Wolf return -ENOMEM; 5900df93305SKevin Wolf } 59127deebe8SFrediano Ziglio } else { 59227deebe8SFrediano Ziglio orig_buf = NULL; 59327deebe8SFrediano Ziglio buf = (uint8_t *)qiov->iov->iov_base; 594019d6b8fSAnthony Liguori } 595019d6b8fSAnthony Liguori 59627deebe8SFrediano Ziglio qemu_co_mutex_lock(&s->lock); 59727deebe8SFrediano Ziglio 59827deebe8SFrediano Ziglio while (nb_sectors != 0) { 59943ca85b5SFrediano Ziglio /* prepare next request */ 60027deebe8SFrediano Ziglio cluster_offset = get_cluster_offset(bs, sector_num << 9, 601019d6b8fSAnthony Liguori 0, 0, 0, 0); 60227deebe8SFrediano Ziglio index_in_cluster = sector_num & (s->cluster_sectors - 1); 603430bbaaaSFrediano Ziglio n = s->cluster_sectors - index_in_cluster; 60427deebe8SFrediano Ziglio if (n > nb_sectors) { 60527deebe8SFrediano Ziglio n = nb_sectors; 606430bbaaaSFrediano Ziglio } 607019d6b8fSAnthony Liguori 608430bbaaaSFrediano Ziglio if (!cluster_offset) { 609760e0063SKevin Wolf if (bs->backing) { 610019d6b8fSAnthony Liguori /* read from the base image */ 61127deebe8SFrediano Ziglio hd_iov.iov_base = (void *)buf; 612430bbaaaSFrediano Ziglio hd_iov.iov_len = n * 512; 613430bbaaaSFrediano Ziglio qemu_iovec_init_external(&hd_qiov, &hd_iov, 1); 61452b8eb60SKevin Wolf qemu_co_mutex_unlock(&s->lock); 615760e0063SKevin Wolf ret = bdrv_co_readv(bs->backing->bs, sector_num, 616430bbaaaSFrediano Ziglio n, &hd_qiov); 61752b8eb60SKevin Wolf qemu_co_mutex_lock(&s->lock); 61852b8eb60SKevin Wolf if (ret < 0) { 61927deebe8SFrediano Ziglio goto fail; 6205614c188SStefan Weil } 621019d6b8fSAnthony Liguori } else { 622019d6b8fSAnthony Liguori /* Note: in this case, no need to wait */ 62327deebe8SFrediano Ziglio memset(buf, 0, 512 * n); 624019d6b8fSAnthony Liguori } 625430bbaaaSFrediano Ziglio } else if (cluster_offset & QCOW_OFLAG_COMPRESSED) { 626019d6b8fSAnthony Liguori /* add AIO support for compressed blocks ? */ 627430bbaaaSFrediano Ziglio if (decompress_cluster(bs, cluster_offset) < 0) { 62827deebe8SFrediano Ziglio goto fail; 6295614c188SStefan Weil } 63027deebe8SFrediano Ziglio memcpy(buf, 631430bbaaaSFrediano Ziglio s->cluster_cache + index_in_cluster * 512, 512 * n); 632019d6b8fSAnthony Liguori } else { 633430bbaaaSFrediano Ziglio if ((cluster_offset & 511) != 0) { 63427deebe8SFrediano Ziglio goto fail; 635019d6b8fSAnthony Liguori } 63627deebe8SFrediano Ziglio hd_iov.iov_base = (void *)buf; 637430bbaaaSFrediano Ziglio hd_iov.iov_len = n * 512; 638430bbaaaSFrediano Ziglio qemu_iovec_init_external(&hd_qiov, &hd_iov, 1); 63952b8eb60SKevin Wolf qemu_co_mutex_unlock(&s->lock); 6409a4f4c31SKevin Wolf ret = bdrv_co_readv(bs->file->bs, 641430bbaaaSFrediano Ziglio (cluster_offset >> 9) + index_in_cluster, 642430bbaaaSFrediano Ziglio n, &hd_qiov); 64352b8eb60SKevin Wolf qemu_co_mutex_lock(&s->lock); 64452b8eb60SKevin Wolf if (ret < 0) { 64527deebe8SFrediano Ziglio break; 646019d6b8fSAnthony Liguori } 6478336aafaSDaniel P. Berrange if (bs->encrypted) { 648f6fa64f6SDaniel P. Berrange assert(s->cipher); 649f6fa64f6SDaniel P. Berrange if (encrypt_sectors(s, sector_num, buf, buf, 650f6fa64f6SDaniel P. Berrange n, false, &err) < 0) { 651f6fa64f6SDaniel P. Berrange goto fail; 652f6fa64f6SDaniel P. Berrange } 65343ca85b5SFrediano Ziglio } 65443ca85b5SFrediano Ziglio } 65527deebe8SFrediano Ziglio ret = 0; 65643ca85b5SFrediano Ziglio 65727deebe8SFrediano Ziglio nb_sectors -= n; 65827deebe8SFrediano Ziglio sector_num += n; 65927deebe8SFrediano Ziglio buf += n * 512; 66052b8eb60SKevin Wolf } 661019d6b8fSAnthony Liguori 66227deebe8SFrediano Ziglio done: 66352b8eb60SKevin Wolf qemu_co_mutex_unlock(&s->lock); 66452b8eb60SKevin Wolf 66527deebe8SFrediano Ziglio if (qiov->niov > 1) { 66603396148SMichael Tokarev qemu_iovec_from_buf(qiov, 0, orig_buf, qiov->size); 66727deebe8SFrediano Ziglio qemu_vfree(orig_buf); 668019d6b8fSAnthony Liguori } 66952b8eb60SKevin Wolf 67052b8eb60SKevin Wolf return ret; 67127deebe8SFrediano Ziglio 67227deebe8SFrediano Ziglio fail: 673f6fa64f6SDaniel P. Berrange error_free(err); 67427deebe8SFrediano Ziglio ret = -EIO; 67527deebe8SFrediano Ziglio goto done; 676019d6b8fSAnthony Liguori } 677019d6b8fSAnthony Liguori 678a968168cSDong Xu Wang static coroutine_fn int qcow_co_writev(BlockDriverState *bs, int64_t sector_num, 67927deebe8SFrediano Ziglio int nb_sectors, QEMUIOVector *qiov) 680019d6b8fSAnthony Liguori { 681019d6b8fSAnthony Liguori BDRVQcowState *s = bs->opaque; 682019d6b8fSAnthony Liguori int index_in_cluster; 683019d6b8fSAnthony Liguori uint64_t cluster_offset; 684019d6b8fSAnthony Liguori const uint8_t *src_buf; 68527deebe8SFrediano Ziglio int ret = 0, n; 686430bbaaaSFrediano Ziglio uint8_t *cluster_data = NULL; 687430bbaaaSFrediano Ziglio struct iovec hd_iov; 688430bbaaaSFrediano Ziglio QEMUIOVector hd_qiov; 68927deebe8SFrediano Ziglio uint8_t *buf; 69027deebe8SFrediano Ziglio void *orig_buf; 691019d6b8fSAnthony Liguori 69227deebe8SFrediano Ziglio s->cluster_cache_offset = -1; /* disable compressed cache */ 69327deebe8SFrediano Ziglio 69427deebe8SFrediano Ziglio if (qiov->niov > 1) { 6950df93305SKevin Wolf buf = orig_buf = qemu_try_blockalign(bs, qiov->size); 6960df93305SKevin Wolf if (buf == NULL) { 6970df93305SKevin Wolf return -ENOMEM; 6980df93305SKevin Wolf } 699d5e6b161SMichael Tokarev qemu_iovec_to_buf(qiov, 0, buf, qiov->size); 70027deebe8SFrediano Ziglio } else { 70127deebe8SFrediano Ziglio orig_buf = NULL; 70227deebe8SFrediano Ziglio buf = (uint8_t *)qiov->iov->iov_base; 703019d6b8fSAnthony Liguori } 704019d6b8fSAnthony Liguori 70527deebe8SFrediano Ziglio qemu_co_mutex_lock(&s->lock); 70627deebe8SFrediano Ziglio 70727deebe8SFrediano Ziglio while (nb_sectors != 0) { 70827deebe8SFrediano Ziglio 70927deebe8SFrediano Ziglio index_in_cluster = sector_num & (s->cluster_sectors - 1); 710430bbaaaSFrediano Ziglio n = s->cluster_sectors - index_in_cluster; 71127deebe8SFrediano Ziglio if (n > nb_sectors) { 71227deebe8SFrediano Ziglio n = nb_sectors; 713430bbaaaSFrediano Ziglio } 71427deebe8SFrediano Ziglio cluster_offset = get_cluster_offset(bs, sector_num << 9, 1, 0, 715019d6b8fSAnthony Liguori index_in_cluster, 716430bbaaaSFrediano Ziglio index_in_cluster + n); 717019d6b8fSAnthony Liguori if (!cluster_offset || (cluster_offset & 511) != 0) { 71827deebe8SFrediano Ziglio ret = -EIO; 71927deebe8SFrediano Ziglio break; 720019d6b8fSAnthony Liguori } 7218336aafaSDaniel P. Berrange if (bs->encrypted) { 722f6fa64f6SDaniel P. Berrange Error *err = NULL; 723f6fa64f6SDaniel P. Berrange assert(s->cipher); 724430bbaaaSFrediano Ziglio if (!cluster_data) { 725430bbaaaSFrediano Ziglio cluster_data = g_malloc0(s->cluster_size); 726019d6b8fSAnthony Liguori } 727f6fa64f6SDaniel P. Berrange if (encrypt_sectors(s, sector_num, cluster_data, buf, 728f6fa64f6SDaniel P. Berrange n, true, &err) < 0) { 729f6fa64f6SDaniel P. Berrange error_free(err); 730f6fa64f6SDaniel P. Berrange ret = -EIO; 731f6fa64f6SDaniel P. Berrange break; 732f6fa64f6SDaniel P. Berrange } 733430bbaaaSFrediano Ziglio src_buf = cluster_data; 734019d6b8fSAnthony Liguori } else { 73527deebe8SFrediano Ziglio src_buf = buf; 736019d6b8fSAnthony Liguori } 737019d6b8fSAnthony Liguori 738430bbaaaSFrediano Ziglio hd_iov.iov_base = (void *)src_buf; 739430bbaaaSFrediano Ziglio hd_iov.iov_len = n * 512; 740430bbaaaSFrediano Ziglio qemu_iovec_init_external(&hd_qiov, &hd_iov, 1); 74152b8eb60SKevin Wolf qemu_co_mutex_unlock(&s->lock); 7429a4f4c31SKevin Wolf ret = bdrv_co_writev(bs->file->bs, 743019d6b8fSAnthony Liguori (cluster_offset >> 9) + index_in_cluster, 744430bbaaaSFrediano Ziglio n, &hd_qiov); 74552b8eb60SKevin Wolf qemu_co_mutex_lock(&s->lock); 74652b8eb60SKevin Wolf if (ret < 0) { 74727deebe8SFrediano Ziglio break; 7485614c188SStefan Weil } 74927deebe8SFrediano Ziglio ret = 0; 75043ca85b5SFrediano Ziglio 75127deebe8SFrediano Ziglio nb_sectors -= n; 75227deebe8SFrediano Ziglio sector_num += n; 75327deebe8SFrediano Ziglio buf += n * 512; 754019d6b8fSAnthony Liguori } 75552b8eb60SKevin Wolf qemu_co_mutex_unlock(&s->lock); 756019d6b8fSAnthony Liguori 75727deebe8SFrediano Ziglio if (qiov->niov > 1) { 75827deebe8SFrediano Ziglio qemu_vfree(orig_buf); 759b11a24deSKevin Wolf } 760add8d262SStefan Weil g_free(cluster_data); 761b11a24deSKevin Wolf 76252b8eb60SKevin Wolf return ret; 763019d6b8fSAnthony Liguori } 764019d6b8fSAnthony Liguori 765019d6b8fSAnthony Liguori static void qcow_close(BlockDriverState *bs) 766019d6b8fSAnthony Liguori { 767019d6b8fSAnthony Liguori BDRVQcowState *s = bs->opaque; 768fd9f102cSKevin Wolf 769f6fa64f6SDaniel P. Berrange qcrypto_cipher_free(s->cipher); 770f6fa64f6SDaniel P. Berrange s->cipher = NULL; 7717267c094SAnthony Liguori g_free(s->l1_table); 7720df93305SKevin Wolf qemu_vfree(s->l2_cache); 7737267c094SAnthony Liguori g_free(s->cluster_cache); 7747267c094SAnthony Liguori g_free(s->cluster_data); 775fd9f102cSKevin Wolf 776fd9f102cSKevin Wolf migrate_del_blocker(s->migration_blocker); 777fd9f102cSKevin Wolf error_free(s->migration_blocker); 778019d6b8fSAnthony Liguori } 779019d6b8fSAnthony Liguori 78016d12159SChunyan Liu static int qcow_create(const char *filename, QemuOpts *opts, Error **errp) 781019d6b8fSAnthony Liguori { 7822b16c9ffSLi Zhi Hui int header_size, backing_filename_len, l1_size, shift, i; 783019d6b8fSAnthony Liguori QCowHeader header; 7842b16c9ffSLi Zhi Hui uint8_t *tmp; 7850e7e1989SKevin Wolf int64_t total_size = 0; 78616d12159SChunyan Liu char *backing_file = NULL; 7870e7e1989SKevin Wolf int flags = 0; 78834b5d2c6SMax Reitz Error *local_err = NULL; 7893e1a8134SKirill A. Shutemov int ret; 7906af40160SKevin Wolf BlockBackend *qcow_blk; 7910e7e1989SKevin Wolf 7920e7e1989SKevin Wolf /* Read out options */ 793180e9526SHu Tao total_size = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0), 794c2eb918eSHu Tao BDRV_SECTOR_SIZE); 79516d12159SChunyan Liu backing_file = qemu_opt_get_del(opts, BLOCK_OPT_BACKING_FILE); 79616d12159SChunyan Liu if (qemu_opt_get_bool_del(opts, BLOCK_OPT_ENCRYPT, false)) { 79716d12159SChunyan Liu flags |= BLOCK_FLAG_ENCRYPT; 7980e7e1989SKevin Wolf } 799019d6b8fSAnthony Liguori 800c282e1fdSChunyan Liu ret = bdrv_create_file(filename, opts, &local_err); 8012b16c9ffSLi Zhi Hui if (ret < 0) { 802b6d5066dSPaolo Bonzini error_propagate(errp, local_err); 80316d12159SChunyan Liu goto cleanup; 8042b16c9ffSLi Zhi Hui } 8052b16c9ffSLi Zhi Hui 806efaa7c4eSMax Reitz qcow_blk = blk_new_open(filename, NULL, NULL, 80772e775c7SKevin Wolf BDRV_O_RDWR | BDRV_O_PROTOCOL, &local_err); 8086af40160SKevin Wolf if (qcow_blk == NULL) { 809b6d5066dSPaolo Bonzini error_propagate(errp, local_err); 8106af40160SKevin Wolf ret = -EIO; 81116d12159SChunyan Liu goto cleanup; 8122b16c9ffSLi Zhi Hui } 8132b16c9ffSLi Zhi Hui 8146af40160SKevin Wolf blk_set_allow_write_beyond_eof(qcow_blk, true); 8156af40160SKevin Wolf 8166af40160SKevin Wolf ret = blk_truncate(qcow_blk, 0); 8172b16c9ffSLi Zhi Hui if (ret < 0) { 8182b16c9ffSLi Zhi Hui goto exit; 8192b16c9ffSLi Zhi Hui } 8202b16c9ffSLi Zhi Hui 821019d6b8fSAnthony Liguori memset(&header, 0, sizeof(header)); 822019d6b8fSAnthony Liguori header.magic = cpu_to_be32(QCOW_MAGIC); 823019d6b8fSAnthony Liguori header.version = cpu_to_be32(QCOW_VERSION); 824180e9526SHu Tao header.size = cpu_to_be64(total_size); 825019d6b8fSAnthony Liguori header_size = sizeof(header); 826019d6b8fSAnthony Liguori backing_filename_len = 0; 827019d6b8fSAnthony Liguori if (backing_file) { 828019d6b8fSAnthony Liguori if (strcmp(backing_file, "fat:")) { 829019d6b8fSAnthony Liguori header.backing_file_offset = cpu_to_be64(header_size); 830019d6b8fSAnthony Liguori backing_filename_len = strlen(backing_file); 831019d6b8fSAnthony Liguori header.backing_file_size = cpu_to_be32(backing_filename_len); 832019d6b8fSAnthony Liguori header_size += backing_filename_len; 833019d6b8fSAnthony Liguori } else { 834019d6b8fSAnthony Liguori /* special backing file for vvfat */ 835019d6b8fSAnthony Liguori backing_file = NULL; 836019d6b8fSAnthony Liguori } 837019d6b8fSAnthony Liguori header.cluster_bits = 9; /* 512 byte cluster to avoid copying 838dc6fb73dSDeepak Kathayat unmodified sectors */ 839019d6b8fSAnthony Liguori header.l2_bits = 12; /* 32 KB L2 tables */ 840019d6b8fSAnthony Liguori } else { 841019d6b8fSAnthony Liguori header.cluster_bits = 12; /* 4 KB clusters */ 842019d6b8fSAnthony Liguori header.l2_bits = 9; /* 4 KB L2 tables */ 843019d6b8fSAnthony Liguori } 844019d6b8fSAnthony Liguori header_size = (header_size + 7) & ~7; 845019d6b8fSAnthony Liguori shift = header.cluster_bits + header.l2_bits; 846180e9526SHu Tao l1_size = (total_size + (1LL << shift) - 1) >> shift; 847019d6b8fSAnthony Liguori 848019d6b8fSAnthony Liguori header.l1_table_offset = cpu_to_be64(header_size); 849019d6b8fSAnthony Liguori if (flags & BLOCK_FLAG_ENCRYPT) { 850019d6b8fSAnthony Liguori header.crypt_method = cpu_to_be32(QCOW_CRYPT_AES); 851019d6b8fSAnthony Liguori } else { 852019d6b8fSAnthony Liguori header.crypt_method = cpu_to_be32(QCOW_CRYPT_NONE); 853019d6b8fSAnthony Liguori } 854019d6b8fSAnthony Liguori 855019d6b8fSAnthony Liguori /* write all the data */ 856*8341f00dSEric Blake ret = blk_pwrite(qcow_blk, 0, &header, sizeof(header), 0); 8573e1a8134SKirill A. Shutemov if (ret != sizeof(header)) { 8583e1a8134SKirill A. Shutemov goto exit; 8593e1a8134SKirill A. Shutemov } 8603e1a8134SKirill A. Shutemov 861019d6b8fSAnthony Liguori if (backing_file) { 8626af40160SKevin Wolf ret = blk_pwrite(qcow_blk, sizeof(header), 863*8341f00dSEric Blake backing_file, backing_filename_len, 0); 8643e1a8134SKirill A. Shutemov if (ret != backing_filename_len) { 8653e1a8134SKirill A. Shutemov goto exit; 866019d6b8fSAnthony Liguori } 8673e1a8134SKirill A. Shutemov } 8683e1a8134SKirill A. Shutemov 8692b16c9ffSLi Zhi Hui tmp = g_malloc0(BDRV_SECTOR_SIZE); 8702b16c9ffSLi Zhi Hui for (i = 0; i < ((sizeof(uint64_t)*l1_size + BDRV_SECTOR_SIZE - 1)/ 8712b16c9ffSLi Zhi Hui BDRV_SECTOR_SIZE); i++) { 872*8341f00dSEric Blake ret = blk_pwrite(qcow_blk, header_size + BDRV_SECTOR_SIZE * i, 873*8341f00dSEric Blake tmp, BDRV_SECTOR_SIZE, 0); 8742b16c9ffSLi Zhi Hui if (ret != BDRV_SECTOR_SIZE) { 8752b16c9ffSLi Zhi Hui g_free(tmp); 8762b16c9ffSLi Zhi Hui goto exit; 8772b16c9ffSLi Zhi Hui } 8782b16c9ffSLi Zhi Hui } 8792b16c9ffSLi Zhi Hui 8802b16c9ffSLi Zhi Hui g_free(tmp); 8813e1a8134SKirill A. Shutemov ret = 0; 8823e1a8134SKirill A. Shutemov exit: 8836af40160SKevin Wolf blk_unref(qcow_blk); 88416d12159SChunyan Liu cleanup: 88516d12159SChunyan Liu g_free(backing_file); 8863e1a8134SKirill A. Shutemov return ret; 887019d6b8fSAnthony Liguori } 888019d6b8fSAnthony Liguori 889019d6b8fSAnthony Liguori static int qcow_make_empty(BlockDriverState *bs) 890019d6b8fSAnthony Liguori { 891019d6b8fSAnthony Liguori BDRVQcowState *s = bs->opaque; 892019d6b8fSAnthony Liguori uint32_t l1_length = s->l1_size * sizeof(uint64_t); 893019d6b8fSAnthony Liguori int ret; 894019d6b8fSAnthony Liguori 895019d6b8fSAnthony Liguori memset(s->l1_table, 0, l1_length); 8969a4f4c31SKevin Wolf if (bdrv_pwrite_sync(bs->file->bs, s->l1_table_offset, s->l1_table, 8975e5557d9SKevin Wolf l1_length) < 0) 898019d6b8fSAnthony Liguori return -1; 8999a4f4c31SKevin Wolf ret = bdrv_truncate(bs->file->bs, s->l1_table_offset + l1_length); 900019d6b8fSAnthony Liguori if (ret < 0) 901019d6b8fSAnthony Liguori return ret; 902019d6b8fSAnthony Liguori 903019d6b8fSAnthony Liguori memset(s->l2_cache, 0, s->l2_size * L2_CACHE_SIZE * sizeof(uint64_t)); 904019d6b8fSAnthony Liguori memset(s->l2_cache_offsets, 0, L2_CACHE_SIZE * sizeof(uint64_t)); 905019d6b8fSAnthony Liguori memset(s->l2_cache_counts, 0, L2_CACHE_SIZE * sizeof(uint32_t)); 906019d6b8fSAnthony Liguori 907019d6b8fSAnthony Liguori return 0; 908019d6b8fSAnthony Liguori } 909019d6b8fSAnthony Liguori 910019d6b8fSAnthony Liguori /* XXX: put compressed sectors first, then all the cluster aligned 911019d6b8fSAnthony Liguori tables to avoid losing bytes in alignment */ 912019d6b8fSAnthony Liguori static int qcow_write_compressed(BlockDriverState *bs, int64_t sector_num, 913019d6b8fSAnthony Liguori const uint8_t *buf, int nb_sectors) 914019d6b8fSAnthony Liguori { 915019d6b8fSAnthony Liguori BDRVQcowState *s = bs->opaque; 916019d6b8fSAnthony Liguori z_stream strm; 917019d6b8fSAnthony Liguori int ret, out_len; 918019d6b8fSAnthony Liguori uint8_t *out_buf; 919019d6b8fSAnthony Liguori uint64_t cluster_offset; 920019d6b8fSAnthony Liguori 92116b3c5cdSStefan Hajnoczi if (nb_sectors != s->cluster_sectors) { 92216b3c5cdSStefan Hajnoczi ret = -EINVAL; 92316b3c5cdSStefan Hajnoczi 92416b3c5cdSStefan Hajnoczi /* Zero-pad last write if image size is not cluster aligned */ 92516b3c5cdSStefan Hajnoczi if (sector_num + nb_sectors == bs->total_sectors && 92616b3c5cdSStefan Hajnoczi nb_sectors < s->cluster_sectors) { 92716b3c5cdSStefan Hajnoczi uint8_t *pad_buf = qemu_blockalign(bs, s->cluster_size); 92816b3c5cdSStefan Hajnoczi memset(pad_buf, 0, s->cluster_size); 92916b3c5cdSStefan Hajnoczi memcpy(pad_buf, buf, nb_sectors * BDRV_SECTOR_SIZE); 93016b3c5cdSStefan Hajnoczi ret = qcow_write_compressed(bs, sector_num, 93116b3c5cdSStefan Hajnoczi pad_buf, s->cluster_sectors); 93216b3c5cdSStefan Hajnoczi qemu_vfree(pad_buf); 93316b3c5cdSStefan Hajnoczi } 93416b3c5cdSStefan Hajnoczi return ret; 93516b3c5cdSStefan Hajnoczi } 936019d6b8fSAnthony Liguori 9377267c094SAnthony Liguori out_buf = g_malloc(s->cluster_size + (s->cluster_size / 1000) + 128); 938019d6b8fSAnthony Liguori 939019d6b8fSAnthony Liguori /* best compression, small window, no zlib header */ 940019d6b8fSAnthony Liguori memset(&strm, 0, sizeof(strm)); 941019d6b8fSAnthony Liguori ret = deflateInit2(&strm, Z_DEFAULT_COMPRESSION, 942019d6b8fSAnthony Liguori Z_DEFLATED, -12, 943019d6b8fSAnthony Liguori 9, Z_DEFAULT_STRATEGY); 944019d6b8fSAnthony Liguori if (ret != 0) { 94564ebe71aSKevin Wolf ret = -EINVAL; 94664ebe71aSKevin Wolf goto fail; 947019d6b8fSAnthony Liguori } 948019d6b8fSAnthony Liguori 949019d6b8fSAnthony Liguori strm.avail_in = s->cluster_size; 950019d6b8fSAnthony Liguori strm.next_in = (uint8_t *)buf; 951019d6b8fSAnthony Liguori strm.avail_out = s->cluster_size; 952019d6b8fSAnthony Liguori strm.next_out = out_buf; 953019d6b8fSAnthony Liguori 954019d6b8fSAnthony Liguori ret = deflate(&strm, Z_FINISH); 955019d6b8fSAnthony Liguori if (ret != Z_STREAM_END && ret != Z_OK) { 956019d6b8fSAnthony Liguori deflateEnd(&strm); 95764ebe71aSKevin Wolf ret = -EINVAL; 95864ebe71aSKevin Wolf goto fail; 959019d6b8fSAnthony Liguori } 960019d6b8fSAnthony Liguori out_len = strm.next_out - out_buf; 961019d6b8fSAnthony Liguori 962019d6b8fSAnthony Liguori deflateEnd(&strm); 963019d6b8fSAnthony Liguori 964019d6b8fSAnthony Liguori if (ret != Z_STREAM_END || out_len >= s->cluster_size) { 965019d6b8fSAnthony Liguori /* could not compress: write normal cluster */ 96664ebe71aSKevin Wolf ret = bdrv_write(bs, sector_num, buf, s->cluster_sectors); 96764ebe71aSKevin Wolf if (ret < 0) { 96864ebe71aSKevin Wolf goto fail; 96964ebe71aSKevin Wolf } 970019d6b8fSAnthony Liguori } else { 971019d6b8fSAnthony Liguori cluster_offset = get_cluster_offset(bs, sector_num << 9, 2, 972019d6b8fSAnthony Liguori out_len, 0, 0); 97364ebe71aSKevin Wolf if (cluster_offset == 0) { 97464ebe71aSKevin Wolf ret = -EIO; 97564ebe71aSKevin Wolf goto fail; 97664ebe71aSKevin Wolf } 97764ebe71aSKevin Wolf 978019d6b8fSAnthony Liguori cluster_offset &= s->cluster_offset_mask; 9799a4f4c31SKevin Wolf ret = bdrv_pwrite(bs->file->bs, cluster_offset, out_buf, out_len); 98064ebe71aSKevin Wolf if (ret < 0) { 98164ebe71aSKevin Wolf goto fail; 982019d6b8fSAnthony Liguori } 983019d6b8fSAnthony Liguori } 984019d6b8fSAnthony Liguori 98564ebe71aSKevin Wolf ret = 0; 98664ebe71aSKevin Wolf fail: 9877267c094SAnthony Liguori g_free(out_buf); 98864ebe71aSKevin Wolf return ret; 989019d6b8fSAnthony Liguori } 990019d6b8fSAnthony Liguori 991019d6b8fSAnthony Liguori static int qcow_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) 992019d6b8fSAnthony Liguori { 993019d6b8fSAnthony Liguori BDRVQcowState *s = bs->opaque; 994019d6b8fSAnthony Liguori bdi->cluster_size = s->cluster_size; 995019d6b8fSAnthony Liguori return 0; 996019d6b8fSAnthony Liguori } 997019d6b8fSAnthony Liguori 99816d12159SChunyan Liu static QemuOptsList qcow_create_opts = { 99916d12159SChunyan Liu .name = "qcow-create-opts", 100016d12159SChunyan Liu .head = QTAILQ_HEAD_INITIALIZER(qcow_create_opts.head), 100116d12159SChunyan Liu .desc = { 1002db08adf5SKevin Wolf { 1003db08adf5SKevin Wolf .name = BLOCK_OPT_SIZE, 100416d12159SChunyan Liu .type = QEMU_OPT_SIZE, 1005db08adf5SKevin Wolf .help = "Virtual disk size" 1006db08adf5SKevin Wolf }, 1007db08adf5SKevin Wolf { 1008db08adf5SKevin Wolf .name = BLOCK_OPT_BACKING_FILE, 100916d12159SChunyan Liu .type = QEMU_OPT_STRING, 1010db08adf5SKevin Wolf .help = "File name of a base image" 1011db08adf5SKevin Wolf }, 1012db08adf5SKevin Wolf { 1013db08adf5SKevin Wolf .name = BLOCK_OPT_ENCRYPT, 101416d12159SChunyan Liu .type = QEMU_OPT_BOOL, 101516d12159SChunyan Liu .help = "Encrypt the image", 101616d12159SChunyan Liu .def_value_str = "off" 1017db08adf5SKevin Wolf }, 101816d12159SChunyan Liu { /* end of list */ } 101916d12159SChunyan Liu } 10200e7e1989SKevin Wolf }; 10210e7e1989SKevin Wolf 1022019d6b8fSAnthony Liguori static BlockDriver bdrv_qcow = { 1023019d6b8fSAnthony Liguori .format_name = "qcow", 1024019d6b8fSAnthony Liguori .instance_size = sizeof(BDRVQcowState), 1025019d6b8fSAnthony Liguori .bdrv_probe = qcow_probe, 1026019d6b8fSAnthony Liguori .bdrv_open = qcow_open, 1027019d6b8fSAnthony Liguori .bdrv_close = qcow_close, 1028d177692eSJeff Cody .bdrv_reopen_prepare = qcow_reopen_prepare, 1029c282e1fdSChunyan Liu .bdrv_create = qcow_create, 10303ac21627SPeter Lieven .bdrv_has_zero_init = bdrv_has_zero_init_1, 10318ee79e70SKevin Wolf .supports_backing = true, 1032c68b89acSKevin Wolf 103352b8eb60SKevin Wolf .bdrv_co_readv = qcow_co_readv, 103452b8eb60SKevin Wolf .bdrv_co_writev = qcow_co_writev, 1035b6b8a333SPaolo Bonzini .bdrv_co_get_block_status = qcow_co_get_block_status, 1036c68b89acSKevin Wolf 1037c68b89acSKevin Wolf .bdrv_set_key = qcow_set_key, 1038c68b89acSKevin Wolf .bdrv_make_empty = qcow_make_empty, 1039019d6b8fSAnthony Liguori .bdrv_write_compressed = qcow_write_compressed, 1040019d6b8fSAnthony Liguori .bdrv_get_info = qcow_get_info, 10410e7e1989SKevin Wolf 104216d12159SChunyan Liu .create_opts = &qcow_create_opts, 1043019d6b8fSAnthony Liguori }; 1044019d6b8fSAnthony Liguori 1045019d6b8fSAnthony Liguori static void bdrv_qcow_init(void) 1046019d6b8fSAnthony Liguori { 1047019d6b8fSAnthony Liguori bdrv_register(&bdrv_qcow); 1048019d6b8fSAnthony Liguori } 1049019d6b8fSAnthony Liguori 1050019d6b8fSAnthony Liguori block_init(bdrv_qcow_init); 1051