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" 323cce16f4SKevin Wolf #include "trace.h" 33585f8587Sbellard 34585f8587Sbellard /* 35585f8587Sbellard Differences with QCOW: 36585f8587Sbellard 37585f8587Sbellard - Support for multiple incremental snapshots. 38585f8587Sbellard - Memory management by reference counts. 39585f8587Sbellard - Clusters which have a reference count of one have the bit 40585f8587Sbellard QCOW_OFLAG_COPIED to optimize write performance. 41585f8587Sbellard - Size of compressed clusters is stored in sectors to reduce bit usage 42585f8587Sbellard in the cluster offsets. 43585f8587Sbellard - Support for storing additional data (such as the VM state) in the 44585f8587Sbellard snapshots. 45585f8587Sbellard - If a backing store is used, the cluster size is not constrained 46585f8587Sbellard (could be backported to QCOW). 47585f8587Sbellard - L2 tables have always a size of one cluster. 48585f8587Sbellard */ 49585f8587Sbellard 509b80ddf3Saliguori 519b80ddf3Saliguori typedef struct { 529b80ddf3Saliguori uint32_t magic; 539b80ddf3Saliguori uint32_t len; 549b80ddf3Saliguori } QCowExtension; 557c80ab3fSJes Sorensen #define QCOW2_EXT_MAGIC_END 0 567c80ab3fSJes Sorensen #define QCOW2_EXT_MAGIC_BACKING_FORMAT 0xE2792ACA 57cfcc4c62SKevin Wolf #define QCOW2_EXT_MAGIC_FEATURE_TABLE 0x6803f857 589b80ddf3Saliguori 597c80ab3fSJes Sorensen static int qcow2_probe(const uint8_t *buf, int buf_size, const char *filename) 60585f8587Sbellard { 61585f8587Sbellard const QCowHeader *cow_header = (const void *)buf; 62585f8587Sbellard 63585f8587Sbellard if (buf_size >= sizeof(QCowHeader) && 64585f8587Sbellard be32_to_cpu(cow_header->magic) == QCOW_MAGIC && 656744cbabSKevin Wolf be32_to_cpu(cow_header->version) >= 2) 66585f8587Sbellard return 100; 67585f8587Sbellard else 68585f8587Sbellard return 0; 69585f8587Sbellard } 70585f8587Sbellard 719b80ddf3Saliguori 729b80ddf3Saliguori /* 739b80ddf3Saliguori * read qcow2 extension and fill bs 749b80ddf3Saliguori * start reading from start_offset 759b80ddf3Saliguori * finish reading upon magic of value 0 or when end_offset reached 769b80ddf3Saliguori * unknown magic is skipped (future extension this version knows nothing about) 779b80ddf3Saliguori * return 0 upon success, non-0 otherwise 789b80ddf3Saliguori */ 797c80ab3fSJes Sorensen static int qcow2_read_extensions(BlockDriverState *bs, uint64_t start_offset, 80cfcc4c62SKevin Wolf uint64_t end_offset, void **p_feature_table) 819b80ddf3Saliguori { 8275bab85cSKevin Wolf BDRVQcowState *s = bs->opaque; 839b80ddf3Saliguori QCowExtension ext; 849b80ddf3Saliguori uint64_t offset; 8575bab85cSKevin Wolf int ret; 869b80ddf3Saliguori 879b80ddf3Saliguori #ifdef DEBUG_EXT 887c80ab3fSJes Sorensen printf("qcow2_read_extensions: start=%ld end=%ld\n", start_offset, end_offset); 899b80ddf3Saliguori #endif 909b80ddf3Saliguori offset = start_offset; 919b80ddf3Saliguori while (offset < end_offset) { 929b80ddf3Saliguori 939b80ddf3Saliguori #ifdef DEBUG_EXT 949b80ddf3Saliguori /* Sanity check */ 959b80ddf3Saliguori if (offset > s->cluster_size) 967c80ab3fSJes Sorensen printf("qcow2_read_extension: suspicious offset %lu\n", offset); 979b80ddf3Saliguori 989b2260cbSDong Xu Wang printf("attempting to read extended header in offset %lu\n", offset); 999b80ddf3Saliguori #endif 1009b80ddf3Saliguori 10166f82ceeSKevin Wolf if (bdrv_pread(bs->file, offset, &ext, sizeof(ext)) != sizeof(ext)) { 1027c80ab3fSJes Sorensen fprintf(stderr, "qcow2_read_extension: ERROR: " 1030bfcd599SBlue Swirl "pread fail from offset %" PRIu64 "\n", 1040bfcd599SBlue Swirl offset); 1059b80ddf3Saliguori return 1; 1069b80ddf3Saliguori } 1079b80ddf3Saliguori be32_to_cpus(&ext.magic); 1089b80ddf3Saliguori be32_to_cpus(&ext.len); 1099b80ddf3Saliguori offset += sizeof(ext); 1109b80ddf3Saliguori #ifdef DEBUG_EXT 1119b80ddf3Saliguori printf("ext.magic = 0x%x\n", ext.magic); 1129b80ddf3Saliguori #endif 11364ca6aeeSKevin Wolf if (ext.len > end_offset - offset) { 11464ca6aeeSKevin Wolf error_report("Header extension too large"); 11564ca6aeeSKevin Wolf return -EINVAL; 11664ca6aeeSKevin Wolf } 11764ca6aeeSKevin Wolf 1189b80ddf3Saliguori switch (ext.magic) { 1197c80ab3fSJes Sorensen case QCOW2_EXT_MAGIC_END: 1209b80ddf3Saliguori return 0; 121f965509cSaliguori 1227c80ab3fSJes Sorensen case QCOW2_EXT_MAGIC_BACKING_FORMAT: 123f965509cSaliguori if (ext.len >= sizeof(bs->backing_format)) { 124f965509cSaliguori fprintf(stderr, "ERROR: ext_backing_format: len=%u too large" 1254c978075Saliguori " (>=%zu)\n", 126f965509cSaliguori ext.len, sizeof(bs->backing_format)); 127f965509cSaliguori return 2; 128f965509cSaliguori } 12966f82ceeSKevin Wolf if (bdrv_pread(bs->file, offset , bs->backing_format, 130f965509cSaliguori ext.len) != ext.len) 131f965509cSaliguori return 3; 132f965509cSaliguori bs->backing_format[ext.len] = '\0'; 133f965509cSaliguori #ifdef DEBUG_EXT 134f965509cSaliguori printf("Qcow2: Got format extension %s\n", bs->backing_format); 135f965509cSaliguori #endif 136f965509cSaliguori break; 137f965509cSaliguori 138cfcc4c62SKevin Wolf case QCOW2_EXT_MAGIC_FEATURE_TABLE: 139cfcc4c62SKevin Wolf if (p_feature_table != NULL) { 140cfcc4c62SKevin Wolf void* feature_table = g_malloc0(ext.len + 2 * sizeof(Qcow2Feature)); 141cfcc4c62SKevin Wolf ret = bdrv_pread(bs->file, offset , feature_table, ext.len); 142cfcc4c62SKevin Wolf if (ret < 0) { 143cfcc4c62SKevin Wolf return ret; 144cfcc4c62SKevin Wolf } 145cfcc4c62SKevin Wolf 146cfcc4c62SKevin Wolf *p_feature_table = feature_table; 147cfcc4c62SKevin Wolf } 148cfcc4c62SKevin Wolf break; 149cfcc4c62SKevin Wolf 1509b80ddf3Saliguori default: 15175bab85cSKevin Wolf /* unknown magic - save it in case we need to rewrite the header */ 15275bab85cSKevin Wolf { 15375bab85cSKevin Wolf Qcow2UnknownHeaderExtension *uext; 15475bab85cSKevin Wolf 15575bab85cSKevin Wolf uext = g_malloc0(sizeof(*uext) + ext.len); 15675bab85cSKevin Wolf uext->magic = ext.magic; 15775bab85cSKevin Wolf uext->len = ext.len; 15875bab85cSKevin Wolf QLIST_INSERT_HEAD(&s->unknown_header_ext, uext, next); 15975bab85cSKevin Wolf 16075bab85cSKevin Wolf ret = bdrv_pread(bs->file, offset , uext->data, uext->len); 16175bab85cSKevin Wolf if (ret < 0) { 16275bab85cSKevin Wolf return ret; 16375bab85cSKevin Wolf } 16475bab85cSKevin Wolf } 1659b80ddf3Saliguori break; 1669b80ddf3Saliguori } 167fd29b4bbSKevin Wolf 168fd29b4bbSKevin Wolf offset += ((ext.len + 7) & ~7); 1699b80ddf3Saliguori } 1709b80ddf3Saliguori 1719b80ddf3Saliguori return 0; 1729b80ddf3Saliguori } 1739b80ddf3Saliguori 17475bab85cSKevin Wolf static void cleanup_unknown_header_ext(BlockDriverState *bs) 17575bab85cSKevin Wolf { 17675bab85cSKevin Wolf BDRVQcowState *s = bs->opaque; 17775bab85cSKevin Wolf Qcow2UnknownHeaderExtension *uext, *next; 17875bab85cSKevin Wolf 17975bab85cSKevin Wolf QLIST_FOREACH_SAFE(uext, &s->unknown_header_ext, next, next) { 18075bab85cSKevin Wolf QLIST_REMOVE(uext, next); 18175bab85cSKevin Wolf g_free(uext); 18275bab85cSKevin Wolf } 18375bab85cSKevin Wolf } 1849b80ddf3Saliguori 185b9531b6eSStefan Weil static void GCC_FMT_ATTR(2, 3) report_unsupported(BlockDriverState *bs, 186b9531b6eSStefan Weil const char *fmt, ...) 1876744cbabSKevin Wolf { 1886744cbabSKevin Wolf char msg[64]; 1896744cbabSKevin Wolf va_list ap; 1906744cbabSKevin Wolf 1916744cbabSKevin Wolf va_start(ap, fmt); 1926744cbabSKevin Wolf vsnprintf(msg, sizeof(msg), fmt, ap); 1936744cbabSKevin Wolf va_end(ap); 1946744cbabSKevin Wolf 1956744cbabSKevin Wolf qerror_report(QERR_UNKNOWN_BLOCK_FORMAT_FEATURE, 1966744cbabSKevin Wolf bs->device_name, "qcow2", msg); 1976744cbabSKevin Wolf } 1986744cbabSKevin Wolf 199cfcc4c62SKevin Wolf static void report_unsupported_feature(BlockDriverState *bs, 200cfcc4c62SKevin Wolf Qcow2Feature *table, uint64_t mask) 201cfcc4c62SKevin Wolf { 202cfcc4c62SKevin Wolf while (table && table->name[0] != '\0') { 203cfcc4c62SKevin Wolf if (table->type == QCOW2_FEAT_TYPE_INCOMPATIBLE) { 204cfcc4c62SKevin Wolf if (mask & (1 << table->bit)) { 205cfcc4c62SKevin Wolf report_unsupported(bs, "%.46s",table->name); 206cfcc4c62SKevin Wolf mask &= ~(1 << table->bit); 207cfcc4c62SKevin Wolf } 208cfcc4c62SKevin Wolf } 209cfcc4c62SKevin Wolf table++; 210cfcc4c62SKevin Wolf } 211cfcc4c62SKevin Wolf 212cfcc4c62SKevin Wolf if (mask) { 213cfcc4c62SKevin Wolf report_unsupported(bs, "Unknown incompatible feature: %" PRIx64, mask); 214cfcc4c62SKevin Wolf } 215cfcc4c62SKevin Wolf } 216cfcc4c62SKevin Wolf 2177c80ab3fSJes Sorensen static int qcow2_open(BlockDriverState *bs, int flags) 218585f8587Sbellard { 219585f8587Sbellard BDRVQcowState *s = bs->opaque; 2206d85a57eSJes Sorensen int len, i, ret = 0; 221585f8587Sbellard QCowHeader header; 2229b80ddf3Saliguori uint64_t ext_end; 223585f8587Sbellard 2246d85a57eSJes Sorensen ret = bdrv_pread(bs->file, 0, &header, sizeof(header)); 2256d85a57eSJes Sorensen if (ret < 0) { 226585f8587Sbellard goto fail; 2276d85a57eSJes Sorensen } 228585f8587Sbellard be32_to_cpus(&header.magic); 229585f8587Sbellard be32_to_cpus(&header.version); 230585f8587Sbellard be64_to_cpus(&header.backing_file_offset); 231585f8587Sbellard be32_to_cpus(&header.backing_file_size); 232585f8587Sbellard be64_to_cpus(&header.size); 233585f8587Sbellard be32_to_cpus(&header.cluster_bits); 234585f8587Sbellard be32_to_cpus(&header.crypt_method); 235585f8587Sbellard be64_to_cpus(&header.l1_table_offset); 236585f8587Sbellard be32_to_cpus(&header.l1_size); 237585f8587Sbellard be64_to_cpus(&header.refcount_table_offset); 238585f8587Sbellard be32_to_cpus(&header.refcount_table_clusters); 239585f8587Sbellard be64_to_cpus(&header.snapshots_offset); 240585f8587Sbellard be32_to_cpus(&header.nb_snapshots); 241585f8587Sbellard 242e8cdcec1SKevin Wolf if (header.magic != QCOW_MAGIC) { 2436d85a57eSJes Sorensen ret = -EINVAL; 244585f8587Sbellard goto fail; 2456d85a57eSJes Sorensen } 2466744cbabSKevin Wolf if (header.version < 2 || header.version > 3) { 2476744cbabSKevin Wolf report_unsupported(bs, "QCOW version %d", header.version); 248e8cdcec1SKevin Wolf ret = -ENOTSUP; 249e8cdcec1SKevin Wolf goto fail; 250e8cdcec1SKevin Wolf } 2516744cbabSKevin Wolf 2526744cbabSKevin Wolf s->qcow_version = header.version; 2536744cbabSKevin Wolf 2546744cbabSKevin Wolf /* Initialise version 3 header fields */ 2556744cbabSKevin Wolf if (header.version == 2) { 2566744cbabSKevin Wolf header.incompatible_features = 0; 2576744cbabSKevin Wolf header.compatible_features = 0; 2586744cbabSKevin Wolf header.autoclear_features = 0; 2596744cbabSKevin Wolf header.refcount_order = 4; 2606744cbabSKevin Wolf header.header_length = 72; 2616744cbabSKevin Wolf } else { 2626744cbabSKevin Wolf be64_to_cpus(&header.incompatible_features); 2636744cbabSKevin Wolf be64_to_cpus(&header.compatible_features); 2646744cbabSKevin Wolf be64_to_cpus(&header.autoclear_features); 2656744cbabSKevin Wolf be32_to_cpus(&header.refcount_order); 2666744cbabSKevin Wolf be32_to_cpus(&header.header_length); 2676744cbabSKevin Wolf } 2686744cbabSKevin Wolf 2696744cbabSKevin Wolf if (header.header_length > sizeof(header)) { 2706744cbabSKevin Wolf s->unknown_header_fields_size = header.header_length - sizeof(header); 2716744cbabSKevin Wolf s->unknown_header_fields = g_malloc(s->unknown_header_fields_size); 2726744cbabSKevin Wolf ret = bdrv_pread(bs->file, sizeof(header), s->unknown_header_fields, 2736744cbabSKevin Wolf s->unknown_header_fields_size); 2746744cbabSKevin Wolf if (ret < 0) { 2756744cbabSKevin Wolf goto fail; 2766744cbabSKevin Wolf } 2776744cbabSKevin Wolf } 2786744cbabSKevin Wolf 279cfcc4c62SKevin Wolf if (header.backing_file_offset) { 280cfcc4c62SKevin Wolf ext_end = header.backing_file_offset; 281cfcc4c62SKevin Wolf } else { 282cfcc4c62SKevin Wolf ext_end = 1 << header.cluster_bits; 283cfcc4c62SKevin Wolf } 284cfcc4c62SKevin Wolf 2856744cbabSKevin Wolf /* Handle feature bits */ 2866744cbabSKevin Wolf s->incompatible_features = header.incompatible_features; 2876744cbabSKevin Wolf s->compatible_features = header.compatible_features; 2886744cbabSKevin Wolf s->autoclear_features = header.autoclear_features; 2896744cbabSKevin Wolf 2906744cbabSKevin Wolf if (s->incompatible_features != 0) { 291cfcc4c62SKevin Wolf void *feature_table = NULL; 292cfcc4c62SKevin Wolf qcow2_read_extensions(bs, header.header_length, ext_end, 293cfcc4c62SKevin Wolf &feature_table); 294cfcc4c62SKevin Wolf report_unsupported_feature(bs, feature_table, 295cfcc4c62SKevin Wolf s->incompatible_features); 2966744cbabSKevin Wolf ret = -ENOTSUP; 2976744cbabSKevin Wolf goto fail; 2986744cbabSKevin Wolf } 2996744cbabSKevin Wolf 3006744cbabSKevin Wolf /* Check support for various header values */ 3016744cbabSKevin Wolf if (header.refcount_order != 4) { 3026744cbabSKevin Wolf report_unsupported(bs, "%d bit reference counts", 3036744cbabSKevin Wolf 1 << header.refcount_order); 3046744cbabSKevin Wolf ret = -ENOTSUP; 3056744cbabSKevin Wolf goto fail; 3066744cbabSKevin Wolf } 3076744cbabSKevin Wolf 308d191d12dSStefan Weil if (header.cluster_bits < MIN_CLUSTER_BITS || 3096d85a57eSJes Sorensen header.cluster_bits > MAX_CLUSTER_BITS) { 3106d85a57eSJes Sorensen ret = -EINVAL; 311585f8587Sbellard goto fail; 3126d85a57eSJes Sorensen } 3136d85a57eSJes Sorensen if (header.crypt_method > QCOW_CRYPT_AES) { 3146d85a57eSJes Sorensen ret = -EINVAL; 315585f8587Sbellard goto fail; 3166d85a57eSJes Sorensen } 317585f8587Sbellard s->crypt_method_header = header.crypt_method; 3186d85a57eSJes Sorensen if (s->crypt_method_header) { 319585f8587Sbellard bs->encrypted = 1; 3206d85a57eSJes Sorensen } 321585f8587Sbellard s->cluster_bits = header.cluster_bits; 322585f8587Sbellard s->cluster_size = 1 << s->cluster_bits; 323585f8587Sbellard s->cluster_sectors = 1 << (s->cluster_bits - 9); 324585f8587Sbellard s->l2_bits = s->cluster_bits - 3; /* L2 is always one cluster */ 325585f8587Sbellard s->l2_size = 1 << s->l2_bits; 326585f8587Sbellard bs->total_sectors = header.size / 512; 327585f8587Sbellard s->csize_shift = (62 - (s->cluster_bits - 8)); 328585f8587Sbellard s->csize_mask = (1 << (s->cluster_bits - 8)) - 1; 329585f8587Sbellard s->cluster_offset_mask = (1LL << s->csize_shift) - 1; 330585f8587Sbellard s->refcount_table_offset = header.refcount_table_offset; 331585f8587Sbellard s->refcount_table_size = 332585f8587Sbellard header.refcount_table_clusters << (s->cluster_bits - 3); 333585f8587Sbellard 334585f8587Sbellard s->snapshots_offset = header.snapshots_offset; 335585f8587Sbellard s->nb_snapshots = header.nb_snapshots; 336585f8587Sbellard 337585f8587Sbellard /* read the level 1 table */ 338585f8587Sbellard s->l1_size = header.l1_size; 339419b19d9SStefan Hajnoczi s->l1_vm_state_index = size_to_l1(s, header.size); 340585f8587Sbellard /* the L1 table must contain at least enough entries to put 341585f8587Sbellard header.size bytes */ 3426d85a57eSJes Sorensen if (s->l1_size < s->l1_vm_state_index) { 3436d85a57eSJes Sorensen ret = -EINVAL; 344585f8587Sbellard goto fail; 3456d85a57eSJes Sorensen } 346585f8587Sbellard s->l1_table_offset = header.l1_table_offset; 347d191d12dSStefan Weil if (s->l1_size > 0) { 3487267c094SAnthony Liguori s->l1_table = g_malloc0( 3493f6a3ee5SKevin Wolf align_offset(s->l1_size * sizeof(uint64_t), 512)); 3506d85a57eSJes Sorensen ret = bdrv_pread(bs->file, s->l1_table_offset, s->l1_table, 3516d85a57eSJes Sorensen s->l1_size * sizeof(uint64_t)); 3526d85a57eSJes Sorensen if (ret < 0) { 353585f8587Sbellard goto fail; 3546d85a57eSJes Sorensen } 355585f8587Sbellard for(i = 0;i < s->l1_size; i++) { 356585f8587Sbellard be64_to_cpus(&s->l1_table[i]); 357585f8587Sbellard } 358d191d12dSStefan Weil } 35929c1a730SKevin Wolf 36029c1a730SKevin Wolf /* alloc L2 table/refcount block cache */ 3616af4e9eaSPaolo Bonzini s->l2_table_cache = qcow2_cache_create(bs, L2_CACHE_SIZE); 3626af4e9eaSPaolo Bonzini s->refcount_block_cache = qcow2_cache_create(bs, REFCOUNT_CACHE_SIZE); 36329c1a730SKevin Wolf 3647267c094SAnthony Liguori s->cluster_cache = g_malloc(s->cluster_size); 365585f8587Sbellard /* one more sector for decompressed data alignment */ 366dea43a65SFrediano Ziglio s->cluster_data = qemu_blockalign(bs, QCOW_MAX_CRYPT_CLUSTERS * s->cluster_size 367095a9c58Saliguori + 512); 368585f8587Sbellard s->cluster_cache_offset = -1; 36906d9260fSAnthony Liguori s->flags = flags; 370585f8587Sbellard 3716d85a57eSJes Sorensen ret = qcow2_refcount_init(bs); 3726d85a57eSJes Sorensen if (ret != 0) { 373585f8587Sbellard goto fail; 3746d85a57eSJes Sorensen } 375585f8587Sbellard 37672cf2d4fSBlue Swirl QLIST_INIT(&s->cluster_allocs); 377f214978aSKevin Wolf 3789b80ddf3Saliguori /* read qcow2 extensions */ 379cfcc4c62SKevin Wolf if (qcow2_read_extensions(bs, header.header_length, ext_end, NULL)) { 3806d85a57eSJes Sorensen ret = -EINVAL; 3819b80ddf3Saliguori goto fail; 3826d85a57eSJes Sorensen } 3839b80ddf3Saliguori 384585f8587Sbellard /* read the backing file name */ 385585f8587Sbellard if (header.backing_file_offset != 0) { 386585f8587Sbellard len = header.backing_file_size; 3876d85a57eSJes Sorensen if (len > 1023) { 388585f8587Sbellard len = 1023; 3896d85a57eSJes Sorensen } 3906d85a57eSJes Sorensen ret = bdrv_pread(bs->file, header.backing_file_offset, 3916d85a57eSJes Sorensen bs->backing_file, len); 3926d85a57eSJes Sorensen if (ret < 0) { 393585f8587Sbellard goto fail; 3946d85a57eSJes Sorensen } 395585f8587Sbellard bs->backing_file[len] = '\0'; 396585f8587Sbellard } 39742deb29fSKevin Wolf 39842deb29fSKevin Wolf ret = qcow2_read_snapshots(bs); 39942deb29fSKevin Wolf if (ret < 0) { 400585f8587Sbellard goto fail; 4016d85a57eSJes Sorensen } 402585f8587Sbellard 403*af7b708dSStefan Hajnoczi /* Clear unknown autoclear feature bits */ 404*af7b708dSStefan Hajnoczi if (!bs->read_only && s->autoclear_features != 0) { 405*af7b708dSStefan Hajnoczi s->autoclear_features = 0; 406*af7b708dSStefan Hajnoczi ret = qcow2_update_header(bs); 407*af7b708dSStefan Hajnoczi if (ret < 0) { 408*af7b708dSStefan Hajnoczi goto fail; 409*af7b708dSStefan Hajnoczi } 410*af7b708dSStefan Hajnoczi } 411*af7b708dSStefan Hajnoczi 41268d100e9SKevin Wolf /* Initialise locks */ 41368d100e9SKevin Wolf qemu_co_mutex_init(&s->lock); 41468d100e9SKevin Wolf 415585f8587Sbellard #ifdef DEBUG_ALLOC 4166cbc3031SPhilipp Hahn { 4176cbc3031SPhilipp Hahn BdrvCheckResult result = {0}; 4186cbc3031SPhilipp Hahn qcow2_check_refcounts(bs, &result); 4196cbc3031SPhilipp Hahn } 420585f8587Sbellard #endif 4216d85a57eSJes Sorensen return ret; 422585f8587Sbellard 423585f8587Sbellard fail: 4246744cbabSKevin Wolf g_free(s->unknown_header_fields); 42575bab85cSKevin Wolf cleanup_unknown_header_ext(bs); 426ed6ccf0fSKevin Wolf qcow2_free_snapshots(bs); 427ed6ccf0fSKevin Wolf qcow2_refcount_close(bs); 4287267c094SAnthony Liguori g_free(s->l1_table); 42929c1a730SKevin Wolf if (s->l2_table_cache) { 43029c1a730SKevin Wolf qcow2_cache_destroy(bs, s->l2_table_cache); 43129c1a730SKevin Wolf } 4327267c094SAnthony Liguori g_free(s->cluster_cache); 433dea43a65SFrediano Ziglio qemu_vfree(s->cluster_data); 4346d85a57eSJes Sorensen return ret; 435585f8587Sbellard } 436585f8587Sbellard 4377c80ab3fSJes Sorensen static int qcow2_set_key(BlockDriverState *bs, const char *key) 438585f8587Sbellard { 439585f8587Sbellard BDRVQcowState *s = bs->opaque; 440585f8587Sbellard uint8_t keybuf[16]; 441585f8587Sbellard int len, i; 442585f8587Sbellard 443585f8587Sbellard memset(keybuf, 0, 16); 444585f8587Sbellard len = strlen(key); 445585f8587Sbellard if (len > 16) 446585f8587Sbellard len = 16; 447585f8587Sbellard /* XXX: we could compress the chars to 7 bits to increase 448585f8587Sbellard entropy */ 449585f8587Sbellard for(i = 0;i < len;i++) { 450585f8587Sbellard keybuf[i] = key[i]; 451585f8587Sbellard } 452585f8587Sbellard s->crypt_method = s->crypt_method_header; 453585f8587Sbellard 454585f8587Sbellard if (AES_set_encrypt_key(keybuf, 128, &s->aes_encrypt_key) != 0) 455585f8587Sbellard return -1; 456585f8587Sbellard if (AES_set_decrypt_key(keybuf, 128, &s->aes_decrypt_key) != 0) 457585f8587Sbellard return -1; 458585f8587Sbellard #if 0 459585f8587Sbellard /* test */ 460585f8587Sbellard { 461585f8587Sbellard uint8_t in[16]; 462585f8587Sbellard uint8_t out[16]; 463585f8587Sbellard uint8_t tmp[16]; 464585f8587Sbellard for(i=0;i<16;i++) 465585f8587Sbellard in[i] = i; 466585f8587Sbellard AES_encrypt(in, tmp, &s->aes_encrypt_key); 467585f8587Sbellard AES_decrypt(tmp, out, &s->aes_decrypt_key); 468585f8587Sbellard for(i = 0; i < 16; i++) 469585f8587Sbellard printf(" %02x", tmp[i]); 470585f8587Sbellard printf("\n"); 471585f8587Sbellard for(i = 0; i < 16; i++) 472585f8587Sbellard printf(" %02x", out[i]); 473585f8587Sbellard printf("\n"); 474585f8587Sbellard } 475585f8587Sbellard #endif 476585f8587Sbellard return 0; 477585f8587Sbellard } 478585f8587Sbellard 479f8a2e5e3SStefan Hajnoczi static int coroutine_fn qcow2_co_is_allocated(BlockDriverState *bs, 480f8a2e5e3SStefan Hajnoczi int64_t sector_num, int nb_sectors, int *pnum) 481585f8587Sbellard { 482f8a2e5e3SStefan Hajnoczi BDRVQcowState *s = bs->opaque; 483585f8587Sbellard uint64_t cluster_offset; 4841c46efaaSKevin Wolf int ret; 485585f8587Sbellard 486095a9c58Saliguori *pnum = nb_sectors; 487f8a2e5e3SStefan Hajnoczi /* FIXME We can get errors here, but the bdrv_co_is_allocated interface 488f8a2e5e3SStefan Hajnoczi * can't pass them on today */ 489f8a2e5e3SStefan Hajnoczi qemu_co_mutex_lock(&s->lock); 4901c46efaaSKevin Wolf ret = qcow2_get_cluster_offset(bs, sector_num << 9, pnum, &cluster_offset); 491f8a2e5e3SStefan Hajnoczi qemu_co_mutex_unlock(&s->lock); 4921c46efaaSKevin Wolf if (ret < 0) { 4931c46efaaSKevin Wolf *pnum = 0; 4941c46efaaSKevin Wolf } 495095a9c58Saliguori 496585f8587Sbellard return (cluster_offset != 0); 497585f8587Sbellard } 498585f8587Sbellard 499a9465922Sbellard /* handle reading after the end of the backing file */ 500bd28f835SKevin Wolf int qcow2_backing_read1(BlockDriverState *bs, QEMUIOVector *qiov, 501bd28f835SKevin Wolf int64_t sector_num, int nb_sectors) 502a9465922Sbellard { 503a9465922Sbellard int n1; 504a9465922Sbellard if ((sector_num + nb_sectors) <= bs->total_sectors) 505a9465922Sbellard return nb_sectors; 506a9465922Sbellard if (sector_num >= bs->total_sectors) 507a9465922Sbellard n1 = 0; 508a9465922Sbellard else 509a9465922Sbellard n1 = bs->total_sectors - sector_num; 510bd28f835SKevin Wolf 511e0d9c6f9SChunqiang Tang qemu_iovec_memset_skip(qiov, 0, 512 * (nb_sectors - n1), 512 * n1); 512bd28f835SKevin Wolf 513a9465922Sbellard return n1; 514a9465922Sbellard } 515a9465922Sbellard 516a968168cSDong Xu Wang static coroutine_fn int qcow2_co_readv(BlockDriverState *bs, int64_t sector_num, 5173fc48d09SFrediano Ziglio int remaining_sectors, QEMUIOVector *qiov) 5181490791fSaliguori { 519585f8587Sbellard BDRVQcowState *s = bs->opaque; 520a9465922Sbellard int index_in_cluster, n1; 52168d100e9SKevin Wolf int ret; 522faf575c1SFrediano Ziglio int cur_nr_sectors; /* number of sectors in current iteration */ 523c2bdd990SFrediano Ziglio uint64_t cluster_offset = 0; 5243fc48d09SFrediano Ziglio uint64_t bytes_done = 0; 5253fc48d09SFrediano Ziglio QEMUIOVector hd_qiov; 5263fc48d09SFrediano Ziglio uint8_t *cluster_data = NULL; 527585f8587Sbellard 5283fc48d09SFrediano Ziglio qemu_iovec_init(&hd_qiov, qiov->niov); 5293fc48d09SFrediano Ziglio 5303fc48d09SFrediano Ziglio qemu_co_mutex_lock(&s->lock); 5313fc48d09SFrediano Ziglio 5323fc48d09SFrediano Ziglio while (remaining_sectors != 0) { 533585f8587Sbellard 534faf575c1SFrediano Ziglio /* prepare next request */ 5353fc48d09SFrediano Ziglio cur_nr_sectors = remaining_sectors; 536bd28f835SKevin Wolf if (s->crypt_method) { 537faf575c1SFrediano Ziglio cur_nr_sectors = MIN(cur_nr_sectors, 538bd28f835SKevin Wolf QCOW_MAX_CRYPT_CLUSTERS * s->cluster_sectors); 539bd28f835SKevin Wolf } 540bd28f835SKevin Wolf 5413fc48d09SFrediano Ziglio ret = qcow2_get_cluster_offset(bs, sector_num << 9, 542c2bdd990SFrediano Ziglio &cur_nr_sectors, &cluster_offset); 5431c46efaaSKevin Wolf if (ret < 0) { 5443fc48d09SFrediano Ziglio goto fail; 5451c46efaaSKevin Wolf } 5461c46efaaSKevin Wolf 5473fc48d09SFrediano Ziglio index_in_cluster = sector_num & (s->cluster_sectors - 1); 548585f8587Sbellard 5493fc48d09SFrediano Ziglio qemu_iovec_reset(&hd_qiov); 5503fc48d09SFrediano Ziglio qemu_iovec_copy(&hd_qiov, qiov, bytes_done, 551faf575c1SFrediano Ziglio cur_nr_sectors * 512); 552bd28f835SKevin Wolf 55368d000a3SKevin Wolf switch (ret) { 55468d000a3SKevin Wolf case QCOW2_CLUSTER_UNALLOCATED: 555bd28f835SKevin Wolf 556585f8587Sbellard if (bs->backing_hd) { 557585f8587Sbellard /* read from the base image */ 5583fc48d09SFrediano Ziglio n1 = qcow2_backing_read1(bs->backing_hd, &hd_qiov, 5593fc48d09SFrediano Ziglio sector_num, cur_nr_sectors); 560a9465922Sbellard if (n1 > 0) { 56166f82ceeSKevin Wolf BLKDBG_EVENT(bs->file, BLKDBG_READ_BACKING_AIO); 56268d100e9SKevin Wolf qemu_co_mutex_unlock(&s->lock); 5633fc48d09SFrediano Ziglio ret = bdrv_co_readv(bs->backing_hd, sector_num, 5643fc48d09SFrediano Ziglio n1, &hd_qiov); 56568d100e9SKevin Wolf qemu_co_mutex_lock(&s->lock); 56668d100e9SKevin Wolf if (ret < 0) { 5673fc48d09SFrediano Ziglio goto fail; 5683ab4c7e9SKevin Wolf } 5691490791fSaliguori } 570a9465922Sbellard } else { 571585f8587Sbellard /* Note: in this case, no need to wait */ 5723fc48d09SFrediano Ziglio qemu_iovec_memset(&hd_qiov, 0, 512 * cur_nr_sectors); 5731490791fSaliguori } 57468d000a3SKevin Wolf break; 57568d000a3SKevin Wolf 5766377af48SKevin Wolf case QCOW2_CLUSTER_ZERO: 5776377af48SKevin Wolf if (s->qcow_version < 3) { 5786377af48SKevin Wolf ret = -EIO; 5796377af48SKevin Wolf goto fail; 5806377af48SKevin Wolf } 5816377af48SKevin Wolf qemu_iovec_memset(&hd_qiov, 0, 512 * cur_nr_sectors); 5826377af48SKevin Wolf break; 5836377af48SKevin Wolf 58468d000a3SKevin Wolf case QCOW2_CLUSTER_COMPRESSED: 585585f8587Sbellard /* add AIO support for compressed blocks ? */ 586c2bdd990SFrediano Ziglio ret = qcow2_decompress_cluster(bs, cluster_offset); 5878af36488SKevin Wolf if (ret < 0) { 5883fc48d09SFrediano Ziglio goto fail; 5898af36488SKevin Wolf } 590bd28f835SKevin Wolf 5913fc48d09SFrediano Ziglio qemu_iovec_from_buffer(&hd_qiov, 592bd28f835SKevin Wolf s->cluster_cache + index_in_cluster * 512, 593faf575c1SFrediano Ziglio 512 * cur_nr_sectors); 59468d000a3SKevin Wolf break; 59568d000a3SKevin Wolf 59668d000a3SKevin Wolf case QCOW2_CLUSTER_NORMAL: 597c2bdd990SFrediano Ziglio if ((cluster_offset & 511) != 0) { 5983fc48d09SFrediano Ziglio ret = -EIO; 5993fc48d09SFrediano Ziglio goto fail; 600585f8587Sbellard } 601c87c0672Saliguori 602bd28f835SKevin Wolf if (s->crypt_method) { 603bd28f835SKevin Wolf /* 604bd28f835SKevin Wolf * For encrypted images, read everything into a temporary 605bd28f835SKevin Wolf * contiguous buffer on which the AES functions can work. 606bd28f835SKevin Wolf */ 6073fc48d09SFrediano Ziglio if (!cluster_data) { 6083fc48d09SFrediano Ziglio cluster_data = 609dea43a65SFrediano Ziglio qemu_blockalign(bs, QCOW_MAX_CRYPT_CLUSTERS * s->cluster_size); 610bd28f835SKevin Wolf } 611bd28f835SKevin Wolf 612faf575c1SFrediano Ziglio assert(cur_nr_sectors <= 613bd28f835SKevin Wolf QCOW_MAX_CRYPT_CLUSTERS * s->cluster_sectors); 6143fc48d09SFrediano Ziglio qemu_iovec_reset(&hd_qiov); 6153fc48d09SFrediano Ziglio qemu_iovec_add(&hd_qiov, cluster_data, 616faf575c1SFrediano Ziglio 512 * cur_nr_sectors); 617bd28f835SKevin Wolf } 618bd28f835SKevin Wolf 61966f82ceeSKevin Wolf BLKDBG_EVENT(bs->file, BLKDBG_READ_AIO); 62068d100e9SKevin Wolf qemu_co_mutex_unlock(&s->lock); 62168d100e9SKevin Wolf ret = bdrv_co_readv(bs->file, 622c2bdd990SFrediano Ziglio (cluster_offset >> 9) + index_in_cluster, 6233fc48d09SFrediano Ziglio cur_nr_sectors, &hd_qiov); 62468d100e9SKevin Wolf qemu_co_mutex_lock(&s->lock); 62568d100e9SKevin Wolf if (ret < 0) { 6263fc48d09SFrediano Ziglio goto fail; 627585f8587Sbellard } 628faf575c1SFrediano Ziglio if (s->crypt_method) { 6293fc48d09SFrediano Ziglio qcow2_encrypt_sectors(s, sector_num, cluster_data, 6303fc48d09SFrediano Ziglio cluster_data, cur_nr_sectors, 0, &s->aes_decrypt_key); 6313fc48d09SFrediano Ziglio qemu_iovec_reset(&hd_qiov); 6323fc48d09SFrediano Ziglio qemu_iovec_copy(&hd_qiov, qiov, bytes_done, 633faf575c1SFrediano Ziglio cur_nr_sectors * 512); 6343fc48d09SFrediano Ziglio qemu_iovec_from_buffer(&hd_qiov, cluster_data, 635faf575c1SFrediano Ziglio 512 * cur_nr_sectors); 636171e3d6bSKevin Wolf } 63768d000a3SKevin Wolf break; 63868d000a3SKevin Wolf 63968d000a3SKevin Wolf default: 64068d000a3SKevin Wolf g_assert_not_reached(); 64168d000a3SKevin Wolf ret = -EIO; 64268d000a3SKevin Wolf goto fail; 643faf575c1SFrediano Ziglio } 644faf575c1SFrediano Ziglio 6453fc48d09SFrediano Ziglio remaining_sectors -= cur_nr_sectors; 6463fc48d09SFrediano Ziglio sector_num += cur_nr_sectors; 6473fc48d09SFrediano Ziglio bytes_done += cur_nr_sectors * 512; 6485ebaa27eSFrediano Ziglio } 6493fc48d09SFrediano Ziglio ret = 0; 650f141eafeSaliguori 6513fc48d09SFrediano Ziglio fail: 65268d100e9SKevin Wolf qemu_co_mutex_unlock(&s->lock); 65368d100e9SKevin Wolf 6543fc48d09SFrediano Ziglio qemu_iovec_destroy(&hd_qiov); 655dea43a65SFrediano Ziglio qemu_vfree(cluster_data); 65668d100e9SKevin Wolf 65768d100e9SKevin Wolf return ret; 658585f8587Sbellard } 659585f8587Sbellard 66068d100e9SKevin Wolf static void run_dependent_requests(BDRVQcowState *s, QCowL2Meta *m) 661f214978aSKevin Wolf { 662f214978aSKevin Wolf /* Take the request off the list of running requests */ 663f214978aSKevin Wolf if (m->nb_clusters != 0) { 66472cf2d4fSBlue Swirl QLIST_REMOVE(m, next_in_flight); 665f214978aSKevin Wolf } 666f214978aSKevin Wolf 667d4c146f0SStefan Hajnoczi /* Restart all dependent requests */ 66868d100e9SKevin Wolf if (!qemu_co_queue_empty(&m->dependent_requests)) { 66968d100e9SKevin Wolf qemu_co_mutex_unlock(&s->lock); 670e8ee5e4cSStefan Hajnoczi qemu_co_queue_restart_all(&m->dependent_requests); 67168d100e9SKevin Wolf qemu_co_mutex_lock(&s->lock); 67268d100e9SKevin Wolf } 673f214978aSKevin Wolf } 674f214978aSKevin Wolf 675a968168cSDong Xu Wang static coroutine_fn int qcow2_co_writev(BlockDriverState *bs, 6763fc48d09SFrediano Ziglio int64_t sector_num, 6773fc48d09SFrediano Ziglio int remaining_sectors, 6783fc48d09SFrediano Ziglio QEMUIOVector *qiov) 679585f8587Sbellard { 680585f8587Sbellard BDRVQcowState *s = bs->opaque; 681585f8587Sbellard int index_in_cluster; 682095a9c58Saliguori int n_end; 68368d100e9SKevin Wolf int ret; 684faf575c1SFrediano Ziglio int cur_nr_sectors; /* number of sectors in current iteration */ 685c2bdd990SFrediano Ziglio uint64_t cluster_offset; 6863fc48d09SFrediano Ziglio QEMUIOVector hd_qiov; 6873fc48d09SFrediano Ziglio uint64_t bytes_done = 0; 6883fc48d09SFrediano Ziglio uint8_t *cluster_data = NULL; 6898e217d53SKevin Wolf QCowL2Meta l2meta = { 6908e217d53SKevin Wolf .nb_clusters = 0, 6918e217d53SKevin Wolf }; 692c2271403SFrediano Ziglio 6933cce16f4SKevin Wolf trace_qcow2_writev_start_req(qemu_coroutine_self(), sector_num, 6943cce16f4SKevin Wolf remaining_sectors); 6953cce16f4SKevin Wolf 696c2271403SFrediano Ziglio qemu_co_queue_init(&l2meta.dependent_requests); 697585f8587Sbellard 6983fc48d09SFrediano Ziglio qemu_iovec_init(&hd_qiov, qiov->niov); 699585f8587Sbellard 7003fc48d09SFrediano Ziglio s->cluster_cache_offset = -1; /* disable compressed cache */ 7013fc48d09SFrediano Ziglio 7023fc48d09SFrediano Ziglio qemu_co_mutex_lock(&s->lock); 7033fc48d09SFrediano Ziglio 7043fc48d09SFrediano Ziglio while (remaining_sectors != 0) { 7053fc48d09SFrediano Ziglio 7063cce16f4SKevin Wolf trace_qcow2_writev_start_part(qemu_coroutine_self()); 7073fc48d09SFrediano Ziglio index_in_cluster = sector_num & (s->cluster_sectors - 1); 7083fc48d09SFrediano Ziglio n_end = index_in_cluster + remaining_sectors; 709095a9c58Saliguori if (s->crypt_method && 7105ebaa27eSFrediano Ziglio n_end > QCOW_MAX_CRYPT_CLUSTERS * s->cluster_sectors) { 711095a9c58Saliguori n_end = QCOW_MAX_CRYPT_CLUSTERS * s->cluster_sectors; 7125ebaa27eSFrediano Ziglio } 713095a9c58Saliguori 7143fc48d09SFrediano Ziglio ret = qcow2_alloc_cluster_offset(bs, sector_num << 9, 715c2271403SFrediano Ziglio index_in_cluster, n_end, &cur_nr_sectors, &l2meta); 716148da7eaSKevin Wolf if (ret < 0) { 7173fc48d09SFrediano Ziglio goto fail; 718148da7eaSKevin Wolf } 719148da7eaSKevin Wolf 720c2bdd990SFrediano Ziglio cluster_offset = l2meta.cluster_offset; 721c2bdd990SFrediano Ziglio assert((cluster_offset & 511) == 0); 722148da7eaSKevin Wolf 7233fc48d09SFrediano Ziglio qemu_iovec_reset(&hd_qiov); 7243fc48d09SFrediano Ziglio qemu_iovec_copy(&hd_qiov, qiov, bytes_done, 725faf575c1SFrediano Ziglio cur_nr_sectors * 512); 7266f5f060bSKevin Wolf 727585f8587Sbellard if (s->crypt_method) { 7283fc48d09SFrediano Ziglio if (!cluster_data) { 729dea43a65SFrediano Ziglio cluster_data = qemu_blockalign(bs, QCOW_MAX_CRYPT_CLUSTERS * 730095a9c58Saliguori s->cluster_size); 731585f8587Sbellard } 7326f5f060bSKevin Wolf 7333fc48d09SFrediano Ziglio assert(hd_qiov.size <= 7345ebaa27eSFrediano Ziglio QCOW_MAX_CRYPT_CLUSTERS * s->cluster_size); 7353fc48d09SFrediano Ziglio qemu_iovec_to_buffer(&hd_qiov, cluster_data); 7366f5f060bSKevin Wolf 7373fc48d09SFrediano Ziglio qcow2_encrypt_sectors(s, sector_num, cluster_data, 7383fc48d09SFrediano Ziglio cluster_data, cur_nr_sectors, 1, &s->aes_encrypt_key); 7396f5f060bSKevin Wolf 7403fc48d09SFrediano Ziglio qemu_iovec_reset(&hd_qiov); 7413fc48d09SFrediano Ziglio qemu_iovec_add(&hd_qiov, cluster_data, 742faf575c1SFrediano Ziglio cur_nr_sectors * 512); 743585f8587Sbellard } 7446f5f060bSKevin Wolf 74566f82ceeSKevin Wolf BLKDBG_EVENT(bs->file, BLKDBG_WRITE_AIO); 74668d100e9SKevin Wolf qemu_co_mutex_unlock(&s->lock); 7473cce16f4SKevin Wolf trace_qcow2_writev_data(qemu_coroutine_self(), 7483cce16f4SKevin Wolf (cluster_offset >> 9) + index_in_cluster); 74968d100e9SKevin Wolf ret = bdrv_co_writev(bs->file, 750c2bdd990SFrediano Ziglio (cluster_offset >> 9) + index_in_cluster, 7513fc48d09SFrediano Ziglio cur_nr_sectors, &hd_qiov); 75268d100e9SKevin Wolf qemu_co_mutex_lock(&s->lock); 75368d100e9SKevin Wolf if (ret < 0) { 7543fc48d09SFrediano Ziglio goto fail; 755171e3d6bSKevin Wolf } 756f141eafeSaliguori 757c2271403SFrediano Ziglio ret = qcow2_alloc_cluster_link_l2(bs, &l2meta); 758faf575c1SFrediano Ziglio if (ret < 0) { 7593fc48d09SFrediano Ziglio goto fail; 760faf575c1SFrediano Ziglio } 761faf575c1SFrediano Ziglio 7620fa9131aSKevin Wolf run_dependent_requests(s, &l2meta); 7630fa9131aSKevin Wolf 7643fc48d09SFrediano Ziglio remaining_sectors -= cur_nr_sectors; 7653fc48d09SFrediano Ziglio sector_num += cur_nr_sectors; 7663fc48d09SFrediano Ziglio bytes_done += cur_nr_sectors * 512; 7673cce16f4SKevin Wolf trace_qcow2_writev_done_part(qemu_coroutine_self(), cur_nr_sectors); 7685ebaa27eSFrediano Ziglio } 7693fc48d09SFrediano Ziglio ret = 0; 770faf575c1SFrediano Ziglio 7713fc48d09SFrediano Ziglio fail: 7720fa9131aSKevin Wolf run_dependent_requests(s, &l2meta); 7730fa9131aSKevin Wolf 77468d100e9SKevin Wolf qemu_co_mutex_unlock(&s->lock); 775585f8587Sbellard 7763fc48d09SFrediano Ziglio qemu_iovec_destroy(&hd_qiov); 777dea43a65SFrediano Ziglio qemu_vfree(cluster_data); 7783cce16f4SKevin Wolf trace_qcow2_writev_done_req(qemu_coroutine_self(), ret); 77942496d62SKevin Wolf 78068d100e9SKevin Wolf return ret; 781585f8587Sbellard } 782585f8587Sbellard 7837c80ab3fSJes Sorensen static void qcow2_close(BlockDriverState *bs) 784585f8587Sbellard { 785585f8587Sbellard BDRVQcowState *s = bs->opaque; 7867267c094SAnthony Liguori g_free(s->l1_table); 78729c1a730SKevin Wolf 78829c1a730SKevin Wolf qcow2_cache_flush(bs, s->l2_table_cache); 78929c1a730SKevin Wolf qcow2_cache_flush(bs, s->refcount_block_cache); 79029c1a730SKevin Wolf 79129c1a730SKevin Wolf qcow2_cache_destroy(bs, s->l2_table_cache); 79229c1a730SKevin Wolf qcow2_cache_destroy(bs, s->refcount_block_cache); 79329c1a730SKevin Wolf 7946744cbabSKevin Wolf g_free(s->unknown_header_fields); 79575bab85cSKevin Wolf cleanup_unknown_header_ext(bs); 7966744cbabSKevin Wolf 7977267c094SAnthony Liguori g_free(s->cluster_cache); 798dea43a65SFrediano Ziglio qemu_vfree(s->cluster_data); 799ed6ccf0fSKevin Wolf qcow2_refcount_close(bs); 80028c1202bSLi Zhi Hui qcow2_free_snapshots(bs); 801585f8587Sbellard } 802585f8587Sbellard 80306d9260fSAnthony Liguori static void qcow2_invalidate_cache(BlockDriverState *bs) 80406d9260fSAnthony Liguori { 80506d9260fSAnthony Liguori BDRVQcowState *s = bs->opaque; 80606d9260fSAnthony Liguori int flags = s->flags; 80706d9260fSAnthony Liguori AES_KEY aes_encrypt_key; 80806d9260fSAnthony Liguori AES_KEY aes_decrypt_key; 80906d9260fSAnthony Liguori uint32_t crypt_method = 0; 81006d9260fSAnthony Liguori 81106d9260fSAnthony Liguori /* 81206d9260fSAnthony Liguori * Backing files are read-only which makes all of their metadata immutable, 81306d9260fSAnthony Liguori * that means we don't have to worry about reopening them here. 81406d9260fSAnthony Liguori */ 81506d9260fSAnthony Liguori 81606d9260fSAnthony Liguori if (s->crypt_method) { 81706d9260fSAnthony Liguori crypt_method = s->crypt_method; 81806d9260fSAnthony Liguori memcpy(&aes_encrypt_key, &s->aes_encrypt_key, sizeof(aes_encrypt_key)); 81906d9260fSAnthony Liguori memcpy(&aes_decrypt_key, &s->aes_decrypt_key, sizeof(aes_decrypt_key)); 82006d9260fSAnthony Liguori } 82106d9260fSAnthony Liguori 82206d9260fSAnthony Liguori qcow2_close(bs); 82306d9260fSAnthony Liguori 82406d9260fSAnthony Liguori memset(s, 0, sizeof(BDRVQcowState)); 82506d9260fSAnthony Liguori qcow2_open(bs, flags); 82606d9260fSAnthony Liguori 82706d9260fSAnthony Liguori if (crypt_method) { 82806d9260fSAnthony Liguori s->crypt_method = crypt_method; 82906d9260fSAnthony Liguori memcpy(&s->aes_encrypt_key, &aes_encrypt_key, sizeof(aes_encrypt_key)); 83006d9260fSAnthony Liguori memcpy(&s->aes_decrypt_key, &aes_decrypt_key, sizeof(aes_decrypt_key)); 83106d9260fSAnthony Liguori } 83206d9260fSAnthony Liguori } 83306d9260fSAnthony Liguori 834e24e49e6SKevin Wolf static size_t header_ext_add(char *buf, uint32_t magic, const void *s, 835e24e49e6SKevin Wolf size_t len, size_t buflen) 836756e6736SKevin Wolf { 837e24e49e6SKevin Wolf QCowExtension *ext_backing_fmt = (QCowExtension*) buf; 838e24e49e6SKevin Wolf size_t ext_len = sizeof(QCowExtension) + ((len + 7) & ~7); 839756e6736SKevin Wolf 840e24e49e6SKevin Wolf if (buflen < ext_len) { 841756e6736SKevin Wolf return -ENOSPC; 842756e6736SKevin Wolf } 843756e6736SKevin Wolf 844e24e49e6SKevin Wolf *ext_backing_fmt = (QCowExtension) { 845e24e49e6SKevin Wolf .magic = cpu_to_be32(magic), 846e24e49e6SKevin Wolf .len = cpu_to_be32(len), 847e24e49e6SKevin Wolf }; 848e24e49e6SKevin Wolf memcpy(buf + sizeof(QCowExtension), s, len); 849756e6736SKevin Wolf 850e24e49e6SKevin Wolf return ext_len; 851756e6736SKevin Wolf } 852756e6736SKevin Wolf 853e24e49e6SKevin Wolf /* 854e24e49e6SKevin Wolf * Updates the qcow2 header, including the variable length parts of it, i.e. 855e24e49e6SKevin Wolf * the backing file name and all extensions. qcow2 was not designed to allow 856e24e49e6SKevin Wolf * such changes, so if we run out of space (we can only use the first cluster) 857e24e49e6SKevin Wolf * this function may fail. 858e24e49e6SKevin Wolf * 859e24e49e6SKevin Wolf * Returns 0 on success, -errno in error cases. 860e24e49e6SKevin Wolf */ 861e24e49e6SKevin Wolf int qcow2_update_header(BlockDriverState *bs) 862e24e49e6SKevin Wolf { 863e24e49e6SKevin Wolf BDRVQcowState *s = bs->opaque; 864e24e49e6SKevin Wolf QCowHeader *header; 865e24e49e6SKevin Wolf char *buf; 866e24e49e6SKevin Wolf size_t buflen = s->cluster_size; 867e24e49e6SKevin Wolf int ret; 868e24e49e6SKevin Wolf uint64_t total_size; 869e24e49e6SKevin Wolf uint32_t refcount_table_clusters; 8706744cbabSKevin Wolf size_t header_length; 87175bab85cSKevin Wolf Qcow2UnknownHeaderExtension *uext; 872e24e49e6SKevin Wolf 873e24e49e6SKevin Wolf buf = qemu_blockalign(bs, buflen); 874e24e49e6SKevin Wolf 875e24e49e6SKevin Wolf /* Header structure */ 876e24e49e6SKevin Wolf header = (QCowHeader*) buf; 877e24e49e6SKevin Wolf 878e24e49e6SKevin Wolf if (buflen < sizeof(*header)) { 879e24e49e6SKevin Wolf ret = -ENOSPC; 880e24e49e6SKevin Wolf goto fail; 881756e6736SKevin Wolf } 882756e6736SKevin Wolf 8836744cbabSKevin Wolf header_length = sizeof(*header) + s->unknown_header_fields_size; 884e24e49e6SKevin Wolf total_size = bs->total_sectors * BDRV_SECTOR_SIZE; 885e24e49e6SKevin Wolf refcount_table_clusters = s->refcount_table_size >> (s->cluster_bits - 3); 886e24e49e6SKevin Wolf 887e24e49e6SKevin Wolf *header = (QCowHeader) { 8886744cbabSKevin Wolf /* Version 2 fields */ 889e24e49e6SKevin Wolf .magic = cpu_to_be32(QCOW_MAGIC), 8906744cbabSKevin Wolf .version = cpu_to_be32(s->qcow_version), 891e24e49e6SKevin Wolf .backing_file_offset = 0, 892e24e49e6SKevin Wolf .backing_file_size = 0, 893e24e49e6SKevin Wolf .cluster_bits = cpu_to_be32(s->cluster_bits), 894e24e49e6SKevin Wolf .size = cpu_to_be64(total_size), 895e24e49e6SKevin Wolf .crypt_method = cpu_to_be32(s->crypt_method_header), 896e24e49e6SKevin Wolf .l1_size = cpu_to_be32(s->l1_size), 897e24e49e6SKevin Wolf .l1_table_offset = cpu_to_be64(s->l1_table_offset), 898e24e49e6SKevin Wolf .refcount_table_offset = cpu_to_be64(s->refcount_table_offset), 899e24e49e6SKevin Wolf .refcount_table_clusters = cpu_to_be32(refcount_table_clusters), 900e24e49e6SKevin Wolf .nb_snapshots = cpu_to_be32(s->nb_snapshots), 901e24e49e6SKevin Wolf .snapshots_offset = cpu_to_be64(s->snapshots_offset), 9026744cbabSKevin Wolf 9036744cbabSKevin Wolf /* Version 3 fields */ 9046744cbabSKevin Wolf .incompatible_features = cpu_to_be64(s->incompatible_features), 9056744cbabSKevin Wolf .compatible_features = cpu_to_be64(s->compatible_features), 9066744cbabSKevin Wolf .autoclear_features = cpu_to_be64(s->autoclear_features), 9076744cbabSKevin Wolf .refcount_order = cpu_to_be32(3 + REFCOUNT_SHIFT), 9086744cbabSKevin Wolf .header_length = cpu_to_be32(header_length), 909e24e49e6SKevin Wolf }; 910e24e49e6SKevin Wolf 9116744cbabSKevin Wolf /* For older versions, write a shorter header */ 9126744cbabSKevin Wolf switch (s->qcow_version) { 9136744cbabSKevin Wolf case 2: 9146744cbabSKevin Wolf ret = offsetof(QCowHeader, incompatible_features); 9156744cbabSKevin Wolf break; 9166744cbabSKevin Wolf case 3: 9176744cbabSKevin Wolf ret = sizeof(*header); 9186744cbabSKevin Wolf break; 9196744cbabSKevin Wolf default: 920b6c14762SJim Meyering ret = -EINVAL; 921b6c14762SJim Meyering goto fail; 9226744cbabSKevin Wolf } 9236744cbabSKevin Wolf 9246744cbabSKevin Wolf buf += ret; 9256744cbabSKevin Wolf buflen -= ret; 9266744cbabSKevin Wolf memset(buf, 0, buflen); 9276744cbabSKevin Wolf 9286744cbabSKevin Wolf /* Preserve any unknown field in the header */ 9296744cbabSKevin Wolf if (s->unknown_header_fields_size) { 9306744cbabSKevin Wolf if (buflen < s->unknown_header_fields_size) { 9316744cbabSKevin Wolf ret = -ENOSPC; 9326744cbabSKevin Wolf goto fail; 9336744cbabSKevin Wolf } 9346744cbabSKevin Wolf 9356744cbabSKevin Wolf memcpy(buf, s->unknown_header_fields, s->unknown_header_fields_size); 9366744cbabSKevin Wolf buf += s->unknown_header_fields_size; 9376744cbabSKevin Wolf buflen -= s->unknown_header_fields_size; 9386744cbabSKevin Wolf } 939e24e49e6SKevin Wolf 940e24e49e6SKevin Wolf /* Backing file format header extension */ 941e24e49e6SKevin Wolf if (*bs->backing_format) { 942e24e49e6SKevin Wolf ret = header_ext_add(buf, QCOW2_EXT_MAGIC_BACKING_FORMAT, 943e24e49e6SKevin Wolf bs->backing_format, strlen(bs->backing_format), 944e24e49e6SKevin Wolf buflen); 945756e6736SKevin Wolf if (ret < 0) { 946756e6736SKevin Wolf goto fail; 947756e6736SKevin Wolf } 948756e6736SKevin Wolf 949e24e49e6SKevin Wolf buf += ret; 950e24e49e6SKevin Wolf buflen -= ret; 951e24e49e6SKevin Wolf } 952756e6736SKevin Wolf 953cfcc4c62SKevin Wolf /* Feature table */ 954cfcc4c62SKevin Wolf Qcow2Feature features[] = { 955cfcc4c62SKevin Wolf /* no feature defined yet */ 956cfcc4c62SKevin Wolf }; 957cfcc4c62SKevin Wolf 958cfcc4c62SKevin Wolf ret = header_ext_add(buf, QCOW2_EXT_MAGIC_FEATURE_TABLE, 959cfcc4c62SKevin Wolf features, sizeof(features), buflen); 960cfcc4c62SKevin Wolf if (ret < 0) { 961cfcc4c62SKevin Wolf goto fail; 962cfcc4c62SKevin Wolf } 963cfcc4c62SKevin Wolf buf += ret; 964cfcc4c62SKevin Wolf buflen -= ret; 965cfcc4c62SKevin Wolf 96675bab85cSKevin Wolf /* Keep unknown header extensions */ 96775bab85cSKevin Wolf QLIST_FOREACH(uext, &s->unknown_header_ext, next) { 96875bab85cSKevin Wolf ret = header_ext_add(buf, uext->magic, uext->data, uext->len, buflen); 96975bab85cSKevin Wolf if (ret < 0) { 97075bab85cSKevin Wolf goto fail; 97175bab85cSKevin Wolf } 97275bab85cSKevin Wolf 97375bab85cSKevin Wolf buf += ret; 97475bab85cSKevin Wolf buflen -= ret; 97575bab85cSKevin Wolf } 97675bab85cSKevin Wolf 977e24e49e6SKevin Wolf /* End of header extensions */ 978e24e49e6SKevin Wolf ret = header_ext_add(buf, QCOW2_EXT_MAGIC_END, NULL, 0, buflen); 979756e6736SKevin Wolf if (ret < 0) { 980756e6736SKevin Wolf goto fail; 981756e6736SKevin Wolf } 982756e6736SKevin Wolf 983e24e49e6SKevin Wolf buf += ret; 984e24e49e6SKevin Wolf buflen -= ret; 985e24e49e6SKevin Wolf 986e24e49e6SKevin Wolf /* Backing file name */ 987e24e49e6SKevin Wolf if (*bs->backing_file) { 988e24e49e6SKevin Wolf size_t backing_file_len = strlen(bs->backing_file); 989e24e49e6SKevin Wolf 990e24e49e6SKevin Wolf if (buflen < backing_file_len) { 991e24e49e6SKevin Wolf ret = -ENOSPC; 992e24e49e6SKevin Wolf goto fail; 993e24e49e6SKevin Wolf } 994e24e49e6SKevin Wolf 995e24e49e6SKevin Wolf strncpy(buf, bs->backing_file, buflen); 996e24e49e6SKevin Wolf 997e24e49e6SKevin Wolf header->backing_file_offset = cpu_to_be64(buf - ((char*) header)); 998e24e49e6SKevin Wolf header->backing_file_size = cpu_to_be32(backing_file_len); 999e24e49e6SKevin Wolf } 1000e24e49e6SKevin Wolf 1001e24e49e6SKevin Wolf /* Write the new header */ 1002e24e49e6SKevin Wolf ret = bdrv_pwrite(bs->file, 0, header, s->cluster_size); 1003756e6736SKevin Wolf if (ret < 0) { 1004756e6736SKevin Wolf goto fail; 1005756e6736SKevin Wolf } 1006756e6736SKevin Wolf 1007756e6736SKevin Wolf ret = 0; 1008756e6736SKevin Wolf fail: 1009e24e49e6SKevin Wolf qemu_vfree(header); 1010756e6736SKevin Wolf return ret; 1011756e6736SKevin Wolf } 1012756e6736SKevin Wolf 1013756e6736SKevin Wolf static int qcow2_change_backing_file(BlockDriverState *bs, 1014756e6736SKevin Wolf const char *backing_file, const char *backing_fmt) 1015756e6736SKevin Wolf { 1016e24e49e6SKevin Wolf pstrcpy(bs->backing_file, sizeof(bs->backing_file), backing_file ?: ""); 1017e24e49e6SKevin Wolf pstrcpy(bs->backing_format, sizeof(bs->backing_format), backing_fmt ?: ""); 1018e24e49e6SKevin Wolf 1019e24e49e6SKevin Wolf return qcow2_update_header(bs); 1020756e6736SKevin Wolf } 1021756e6736SKevin Wolf 1022a35e1c17SKevin Wolf static int preallocate(BlockDriverState *bs) 1023a35e1c17SKevin Wolf { 1024a35e1c17SKevin Wolf uint64_t nb_sectors; 1025a35e1c17SKevin Wolf uint64_t offset; 1026a35e1c17SKevin Wolf int num; 1027148da7eaSKevin Wolf int ret; 1028a35e1c17SKevin Wolf QCowL2Meta meta; 1029a35e1c17SKevin Wolf 1030a35e1c17SKevin Wolf nb_sectors = bdrv_getlength(bs) >> 9; 1031a35e1c17SKevin Wolf offset = 0; 103268d100e9SKevin Wolf qemu_co_queue_init(&meta.dependent_requests); 1033148da7eaSKevin Wolf meta.cluster_offset = 0; 1034a35e1c17SKevin Wolf 1035a35e1c17SKevin Wolf while (nb_sectors) { 1036a35e1c17SKevin Wolf num = MIN(nb_sectors, INT_MAX >> 9); 1037148da7eaSKevin Wolf ret = qcow2_alloc_cluster_offset(bs, offset, 0, num, &num, &meta); 1038148da7eaSKevin Wolf if (ret < 0) { 103919dbcbf7SKevin Wolf return ret; 1040a35e1c17SKevin Wolf } 1041a35e1c17SKevin Wolf 104219dbcbf7SKevin Wolf ret = qcow2_alloc_cluster_link_l2(bs, &meta); 104319dbcbf7SKevin Wolf if (ret < 0) { 1044148da7eaSKevin Wolf qcow2_free_any_clusters(bs, meta.cluster_offset, meta.nb_clusters); 104519dbcbf7SKevin Wolf return ret; 1046a35e1c17SKevin Wolf } 1047a35e1c17SKevin Wolf 1048f214978aSKevin Wolf /* There are no dependent requests, but we need to remove our request 1049f214978aSKevin Wolf * from the list of in-flight requests */ 105068d100e9SKevin Wolf run_dependent_requests(bs->opaque, &meta); 1051f214978aSKevin Wolf 1052a35e1c17SKevin Wolf /* TODO Preallocate data if requested */ 1053a35e1c17SKevin Wolf 1054a35e1c17SKevin Wolf nb_sectors -= num; 1055a35e1c17SKevin Wolf offset += num << 9; 1056a35e1c17SKevin Wolf } 1057a35e1c17SKevin Wolf 1058a35e1c17SKevin Wolf /* 1059a35e1c17SKevin Wolf * It is expected that the image file is large enough to actually contain 1060a35e1c17SKevin Wolf * all of the allocated clusters (otherwise we get failing reads after 1061a35e1c17SKevin Wolf * EOF). Extend the image to the last allocated sector. 1062a35e1c17SKevin Wolf */ 1063148da7eaSKevin Wolf if (meta.cluster_offset != 0) { 1064ea80b906SKevin Wolf uint8_t buf[512]; 1065ea80b906SKevin Wolf memset(buf, 0, 512); 106619dbcbf7SKevin Wolf ret = bdrv_write(bs->file, (meta.cluster_offset >> 9) + num - 1, buf, 1); 106719dbcbf7SKevin Wolf if (ret < 0) { 106819dbcbf7SKevin Wolf return ret; 106919dbcbf7SKevin Wolf } 1070a35e1c17SKevin Wolf } 1071a35e1c17SKevin Wolf 1072a35e1c17SKevin Wolf return 0; 1073a35e1c17SKevin Wolf } 1074a35e1c17SKevin Wolf 10757c80ab3fSJes Sorensen static int qcow2_create2(const char *filename, int64_t total_size, 1076a9420734SKevin Wolf const char *backing_file, const char *backing_format, 1077a9420734SKevin Wolf int flags, size_t cluster_size, int prealloc, 10786744cbabSKevin Wolf QEMUOptionParameter *options, int version) 1079a9420734SKevin Wolf { 10809b2260cbSDong Xu Wang /* Calculate cluster_bits */ 1081a9420734SKevin Wolf int cluster_bits; 1082a9420734SKevin Wolf cluster_bits = ffs(cluster_size) - 1; 1083a9420734SKevin Wolf if (cluster_bits < MIN_CLUSTER_BITS || cluster_bits > MAX_CLUSTER_BITS || 1084a9420734SKevin Wolf (1 << cluster_bits) != cluster_size) 1085a9420734SKevin Wolf { 1086a9420734SKevin Wolf error_report( 10876daf194dSMarkus Armbruster "Cluster size must be a power of two between %d and %dk", 1088a9420734SKevin Wolf 1 << MIN_CLUSTER_BITS, 1 << (MAX_CLUSTER_BITS - 10)); 1089a9420734SKevin Wolf return -EINVAL; 1090a9420734SKevin Wolf } 1091a9420734SKevin Wolf 1092a9420734SKevin Wolf /* 1093a9420734SKevin Wolf * Open the image file and write a minimal qcow2 header. 1094a9420734SKevin Wolf * 1095a9420734SKevin Wolf * We keep things simple and start with a zero-sized image. We also 1096a9420734SKevin Wolf * do without refcount blocks or a L1 table for now. We'll fix the 1097a9420734SKevin Wolf * inconsistency later. 1098a9420734SKevin Wolf * 1099a9420734SKevin Wolf * We do need a refcount table because growing the refcount table means 1100a9420734SKevin Wolf * allocating two new refcount blocks - the seconds of which would be at 1101a9420734SKevin Wolf * 2 GB for 64k clusters, and we don't want to have a 2 GB initial file 1102a9420734SKevin Wolf * size for any qcow2 image. 1103a9420734SKevin Wolf */ 1104a9420734SKevin Wolf BlockDriverState* bs; 1105a9420734SKevin Wolf QCowHeader header; 1106a9420734SKevin Wolf uint8_t* refcount_table; 1107a9420734SKevin Wolf int ret; 1108a9420734SKevin Wolf 1109a9420734SKevin Wolf ret = bdrv_create_file(filename, options); 1110a9420734SKevin Wolf if (ret < 0) { 1111a9420734SKevin Wolf return ret; 1112a9420734SKevin Wolf } 1113a9420734SKevin Wolf 1114a9420734SKevin Wolf ret = bdrv_file_open(&bs, filename, BDRV_O_RDWR); 1115a9420734SKevin Wolf if (ret < 0) { 1116a9420734SKevin Wolf return ret; 1117a9420734SKevin Wolf } 1118a9420734SKevin Wolf 1119a9420734SKevin Wolf /* Write the header */ 1120a9420734SKevin Wolf memset(&header, 0, sizeof(header)); 1121a9420734SKevin Wolf header.magic = cpu_to_be32(QCOW_MAGIC); 11226744cbabSKevin Wolf header.version = cpu_to_be32(version); 1123a9420734SKevin Wolf header.cluster_bits = cpu_to_be32(cluster_bits); 1124a9420734SKevin Wolf header.size = cpu_to_be64(0); 1125a9420734SKevin Wolf header.l1_table_offset = cpu_to_be64(0); 1126a9420734SKevin Wolf header.l1_size = cpu_to_be32(0); 1127a9420734SKevin Wolf header.refcount_table_offset = cpu_to_be64(cluster_size); 1128a9420734SKevin Wolf header.refcount_table_clusters = cpu_to_be32(1); 11296744cbabSKevin Wolf header.refcount_order = cpu_to_be32(3 + REFCOUNT_SHIFT); 11306744cbabSKevin Wolf header.header_length = cpu_to_be32(sizeof(header)); 1131a9420734SKevin Wolf 1132a9420734SKevin Wolf if (flags & BLOCK_FLAG_ENCRYPT) { 1133a9420734SKevin Wolf header.crypt_method = cpu_to_be32(QCOW_CRYPT_AES); 1134a9420734SKevin Wolf } else { 1135a9420734SKevin Wolf header.crypt_method = cpu_to_be32(QCOW_CRYPT_NONE); 1136a9420734SKevin Wolf } 1137a9420734SKevin Wolf 1138a9420734SKevin Wolf ret = bdrv_pwrite(bs, 0, &header, sizeof(header)); 1139a9420734SKevin Wolf if (ret < 0) { 1140a9420734SKevin Wolf goto out; 1141a9420734SKevin Wolf } 1142a9420734SKevin Wolf 1143a9420734SKevin Wolf /* Write an empty refcount table */ 11447267c094SAnthony Liguori refcount_table = g_malloc0(cluster_size); 1145a9420734SKevin Wolf ret = bdrv_pwrite(bs, cluster_size, refcount_table, cluster_size); 11467267c094SAnthony Liguori g_free(refcount_table); 1147a9420734SKevin Wolf 1148a9420734SKevin Wolf if (ret < 0) { 1149a9420734SKevin Wolf goto out; 1150a9420734SKevin Wolf } 1151a9420734SKevin Wolf 1152a9420734SKevin Wolf bdrv_close(bs); 1153a9420734SKevin Wolf 1154a9420734SKevin Wolf /* 1155a9420734SKevin Wolf * And now open the image and make it consistent first (i.e. increase the 1156a9420734SKevin Wolf * refcount of the cluster that is occupied by the header and the refcount 1157a9420734SKevin Wolf * table) 1158a9420734SKevin Wolf */ 1159a9420734SKevin Wolf BlockDriver* drv = bdrv_find_format("qcow2"); 1160a9420734SKevin Wolf assert(drv != NULL); 1161e1a7107fSKevin Wolf ret = bdrv_open(bs, filename, 1162e1a7107fSKevin Wolf BDRV_O_RDWR | BDRV_O_CACHE_WB | BDRV_O_NO_FLUSH, drv); 1163a9420734SKevin Wolf if (ret < 0) { 1164a9420734SKevin Wolf goto out; 1165a9420734SKevin Wolf } 1166a9420734SKevin Wolf 1167a9420734SKevin Wolf ret = qcow2_alloc_clusters(bs, 2 * cluster_size); 1168a9420734SKevin Wolf if (ret < 0) { 1169a9420734SKevin Wolf goto out; 1170a9420734SKevin Wolf 1171a9420734SKevin Wolf } else if (ret != 0) { 1172a9420734SKevin Wolf error_report("Huh, first cluster in empty image is already in use?"); 1173a9420734SKevin Wolf abort(); 1174a9420734SKevin Wolf } 1175a9420734SKevin Wolf 1176a9420734SKevin Wolf /* Okay, now that we have a valid image, let's give it the right size */ 1177a9420734SKevin Wolf ret = bdrv_truncate(bs, total_size * BDRV_SECTOR_SIZE); 1178a9420734SKevin Wolf if (ret < 0) { 1179a9420734SKevin Wolf goto out; 1180a9420734SKevin Wolf } 1181a9420734SKevin Wolf 1182a9420734SKevin Wolf /* Want a backing file? There you go.*/ 1183a9420734SKevin Wolf if (backing_file) { 1184a9420734SKevin Wolf ret = bdrv_change_backing_file(bs, backing_file, backing_format); 1185a9420734SKevin Wolf if (ret < 0) { 1186a9420734SKevin Wolf goto out; 1187a9420734SKevin Wolf } 1188a9420734SKevin Wolf } 1189a9420734SKevin Wolf 1190a9420734SKevin Wolf /* And if we're supposed to preallocate metadata, do that now */ 1191a9420734SKevin Wolf if (prealloc) { 119215552c4aSZhi Yong Wu BDRVQcowState *s = bs->opaque; 119315552c4aSZhi Yong Wu qemu_co_mutex_lock(&s->lock); 1194a9420734SKevin Wolf ret = preallocate(bs); 119515552c4aSZhi Yong Wu qemu_co_mutex_unlock(&s->lock); 1196a9420734SKevin Wolf if (ret < 0) { 1197a9420734SKevin Wolf goto out; 1198a9420734SKevin Wolf } 1199a9420734SKevin Wolf } 1200a9420734SKevin Wolf 1201a9420734SKevin Wolf ret = 0; 1202a9420734SKevin Wolf out: 1203a9420734SKevin Wolf bdrv_delete(bs); 1204a9420734SKevin Wolf return ret; 1205a9420734SKevin Wolf } 1206de5f3f40SKevin Wolf 12077c80ab3fSJes Sorensen static int qcow2_create(const char *filename, QEMUOptionParameter *options) 1208de5f3f40SKevin Wolf { 1209de5f3f40SKevin Wolf const char *backing_file = NULL; 1210de5f3f40SKevin Wolf const char *backing_fmt = NULL; 1211de5f3f40SKevin Wolf uint64_t sectors = 0; 1212de5f3f40SKevin Wolf int flags = 0; 121399cce9faSKevin Wolf size_t cluster_size = DEFAULT_CLUSTER_SIZE; 1214de5f3f40SKevin Wolf int prealloc = 0; 12156744cbabSKevin Wolf int version = 2; 1216de5f3f40SKevin Wolf 1217de5f3f40SKevin Wolf /* Read out options */ 1218de5f3f40SKevin Wolf while (options && options->name) { 1219de5f3f40SKevin Wolf if (!strcmp(options->name, BLOCK_OPT_SIZE)) { 1220de5f3f40SKevin Wolf sectors = options->value.n / 512; 1221de5f3f40SKevin Wolf } else if (!strcmp(options->name, BLOCK_OPT_BACKING_FILE)) { 1222de5f3f40SKevin Wolf backing_file = options->value.s; 1223de5f3f40SKevin Wolf } else if (!strcmp(options->name, BLOCK_OPT_BACKING_FMT)) { 1224de5f3f40SKevin Wolf backing_fmt = options->value.s; 1225de5f3f40SKevin Wolf } else if (!strcmp(options->name, BLOCK_OPT_ENCRYPT)) { 1226de5f3f40SKevin Wolf flags |= options->value.n ? BLOCK_FLAG_ENCRYPT : 0; 1227de5f3f40SKevin Wolf } else if (!strcmp(options->name, BLOCK_OPT_CLUSTER_SIZE)) { 1228de5f3f40SKevin Wolf if (options->value.n) { 1229de5f3f40SKevin Wolf cluster_size = options->value.n; 1230de5f3f40SKevin Wolf } 1231de5f3f40SKevin Wolf } else if (!strcmp(options->name, BLOCK_OPT_PREALLOC)) { 1232de5f3f40SKevin Wolf if (!options->value.s || !strcmp(options->value.s, "off")) { 1233de5f3f40SKevin Wolf prealloc = 0; 1234de5f3f40SKevin Wolf } else if (!strcmp(options->value.s, "metadata")) { 1235de5f3f40SKevin Wolf prealloc = 1; 1236de5f3f40SKevin Wolf } else { 1237de5f3f40SKevin Wolf fprintf(stderr, "Invalid preallocation mode: '%s'\n", 1238de5f3f40SKevin Wolf options->value.s); 1239de5f3f40SKevin Wolf return -EINVAL; 1240de5f3f40SKevin Wolf } 12416744cbabSKevin Wolf } else if (!strcmp(options->name, BLOCK_OPT_COMPAT_LEVEL)) { 12426744cbabSKevin Wolf if (!options->value.s || !strcmp(options->value.s, "0.10")) { 12436744cbabSKevin Wolf version = 2; 12446744cbabSKevin Wolf } else if (!strcmp(options->value.s, "1.1")) { 12456744cbabSKevin Wolf version = 3; 12466744cbabSKevin Wolf } else { 12476744cbabSKevin Wolf fprintf(stderr, "Invalid compatibility level: '%s'\n", 12486744cbabSKevin Wolf options->value.s); 12496744cbabSKevin Wolf return -EINVAL; 12506744cbabSKevin Wolf } 1251de5f3f40SKevin Wolf } 1252de5f3f40SKevin Wolf options++; 1253de5f3f40SKevin Wolf } 1254de5f3f40SKevin Wolf 1255de5f3f40SKevin Wolf if (backing_file && prealloc) { 1256de5f3f40SKevin Wolf fprintf(stderr, "Backing file and preallocation cannot be used at " 1257de5f3f40SKevin Wolf "the same time\n"); 1258de5f3f40SKevin Wolf return -EINVAL; 1259de5f3f40SKevin Wolf } 1260de5f3f40SKevin Wolf 12617c80ab3fSJes Sorensen return qcow2_create2(filename, sectors, backing_file, backing_fmt, flags, 12626744cbabSKevin Wolf cluster_size, prealloc, options, version); 1263de5f3f40SKevin Wolf } 1264de5f3f40SKevin Wolf 12657c80ab3fSJes Sorensen static int qcow2_make_empty(BlockDriverState *bs) 126620d97356SBlue Swirl { 126720d97356SBlue Swirl #if 0 126820d97356SBlue Swirl /* XXX: not correct */ 126920d97356SBlue Swirl BDRVQcowState *s = bs->opaque; 127020d97356SBlue Swirl uint32_t l1_length = s->l1_size * sizeof(uint64_t); 127120d97356SBlue Swirl int ret; 127220d97356SBlue Swirl 127320d97356SBlue Swirl memset(s->l1_table, 0, l1_length); 127466f82ceeSKevin Wolf if (bdrv_pwrite(bs->file, s->l1_table_offset, s->l1_table, l1_length) < 0) 127520d97356SBlue Swirl return -1; 127666f82ceeSKevin Wolf ret = bdrv_truncate(bs->file, s->l1_table_offset + l1_length); 127720d97356SBlue Swirl if (ret < 0) 127820d97356SBlue Swirl return ret; 127920d97356SBlue Swirl 128020d97356SBlue Swirl l2_cache_reset(bs); 128120d97356SBlue Swirl #endif 128220d97356SBlue Swirl return 0; 128320d97356SBlue Swirl } 128420d97356SBlue Swirl 1285621f0589SKevin Wolf static coroutine_fn int qcow2_co_write_zeroes(BlockDriverState *bs, 1286621f0589SKevin Wolf int64_t sector_num, int nb_sectors) 1287621f0589SKevin Wolf { 1288621f0589SKevin Wolf int ret; 1289621f0589SKevin Wolf BDRVQcowState *s = bs->opaque; 1290621f0589SKevin Wolf 1291621f0589SKevin Wolf /* Emulate misaligned zero writes */ 1292621f0589SKevin Wolf if (sector_num % s->cluster_sectors || nb_sectors % s->cluster_sectors) { 1293621f0589SKevin Wolf return -ENOTSUP; 1294621f0589SKevin Wolf } 1295621f0589SKevin Wolf 1296621f0589SKevin Wolf /* Whatever is left can use real zero clusters */ 1297621f0589SKevin Wolf qemu_co_mutex_lock(&s->lock); 1298621f0589SKevin Wolf ret = qcow2_zero_clusters(bs, sector_num << BDRV_SECTOR_BITS, 1299621f0589SKevin Wolf nb_sectors); 1300621f0589SKevin Wolf qemu_co_mutex_unlock(&s->lock); 1301621f0589SKevin Wolf 1302621f0589SKevin Wolf return ret; 1303621f0589SKevin Wolf } 1304621f0589SKevin Wolf 13056db39ae2SPaolo Bonzini static coroutine_fn int qcow2_co_discard(BlockDriverState *bs, 13066db39ae2SPaolo Bonzini int64_t sector_num, int nb_sectors) 13075ea929e3SKevin Wolf { 13086db39ae2SPaolo Bonzini int ret; 13096db39ae2SPaolo Bonzini BDRVQcowState *s = bs->opaque; 13106db39ae2SPaolo Bonzini 13116db39ae2SPaolo Bonzini qemu_co_mutex_lock(&s->lock); 13126db39ae2SPaolo Bonzini ret = qcow2_discard_clusters(bs, sector_num << BDRV_SECTOR_BITS, 13135ea929e3SKevin Wolf nb_sectors); 13146db39ae2SPaolo Bonzini qemu_co_mutex_unlock(&s->lock); 13156db39ae2SPaolo Bonzini return ret; 13165ea929e3SKevin Wolf } 13175ea929e3SKevin Wolf 1318419b19d9SStefan Hajnoczi static int qcow2_truncate(BlockDriverState *bs, int64_t offset) 1319419b19d9SStefan Hajnoczi { 1320419b19d9SStefan Hajnoczi BDRVQcowState *s = bs->opaque; 1321419b19d9SStefan Hajnoczi int ret, new_l1_size; 1322419b19d9SStefan Hajnoczi 1323419b19d9SStefan Hajnoczi if (offset & 511) { 1324259b2173SKevin Wolf error_report("The new size must be a multiple of 512"); 1325419b19d9SStefan Hajnoczi return -EINVAL; 1326419b19d9SStefan Hajnoczi } 1327419b19d9SStefan Hajnoczi 1328419b19d9SStefan Hajnoczi /* cannot proceed if image has snapshots */ 1329419b19d9SStefan Hajnoczi if (s->nb_snapshots) { 1330259b2173SKevin Wolf error_report("Can't resize an image which has snapshots"); 1331419b19d9SStefan Hajnoczi return -ENOTSUP; 1332419b19d9SStefan Hajnoczi } 1333419b19d9SStefan Hajnoczi 1334419b19d9SStefan Hajnoczi /* shrinking is currently not supported */ 1335419b19d9SStefan Hajnoczi if (offset < bs->total_sectors * 512) { 1336259b2173SKevin Wolf error_report("qcow2 doesn't support shrinking images yet"); 1337419b19d9SStefan Hajnoczi return -ENOTSUP; 1338419b19d9SStefan Hajnoczi } 1339419b19d9SStefan Hajnoczi 1340419b19d9SStefan Hajnoczi new_l1_size = size_to_l1(s, offset); 134172893756SStefan Hajnoczi ret = qcow2_grow_l1_table(bs, new_l1_size, true); 1342419b19d9SStefan Hajnoczi if (ret < 0) { 1343419b19d9SStefan Hajnoczi return ret; 1344419b19d9SStefan Hajnoczi } 1345419b19d9SStefan Hajnoczi 1346419b19d9SStefan Hajnoczi /* write updated header.size */ 1347419b19d9SStefan Hajnoczi offset = cpu_to_be64(offset); 13488b3b7206SKevin Wolf ret = bdrv_pwrite_sync(bs->file, offsetof(QCowHeader, size), 1349419b19d9SStefan Hajnoczi &offset, sizeof(uint64_t)); 1350419b19d9SStefan Hajnoczi if (ret < 0) { 1351419b19d9SStefan Hajnoczi return ret; 1352419b19d9SStefan Hajnoczi } 1353419b19d9SStefan Hajnoczi 1354419b19d9SStefan Hajnoczi s->l1_vm_state_index = new_l1_size; 1355419b19d9SStefan Hajnoczi return 0; 1356419b19d9SStefan Hajnoczi } 1357419b19d9SStefan Hajnoczi 135820d97356SBlue Swirl /* XXX: put compressed sectors first, then all the cluster aligned 135920d97356SBlue Swirl tables to avoid losing bytes in alignment */ 13607c80ab3fSJes Sorensen static int qcow2_write_compressed(BlockDriverState *bs, int64_t sector_num, 136120d97356SBlue Swirl const uint8_t *buf, int nb_sectors) 136220d97356SBlue Swirl { 136320d97356SBlue Swirl BDRVQcowState *s = bs->opaque; 136420d97356SBlue Swirl z_stream strm; 136520d97356SBlue Swirl int ret, out_len; 136620d97356SBlue Swirl uint8_t *out_buf; 136720d97356SBlue Swirl uint64_t cluster_offset; 136820d97356SBlue Swirl 136920d97356SBlue Swirl if (nb_sectors == 0) { 137020d97356SBlue Swirl /* align end of file to a sector boundary to ease reading with 137120d97356SBlue Swirl sector based I/Os */ 137266f82ceeSKevin Wolf cluster_offset = bdrv_getlength(bs->file); 137320d97356SBlue Swirl cluster_offset = (cluster_offset + 511) & ~511; 137466f82ceeSKevin Wolf bdrv_truncate(bs->file, cluster_offset); 137520d97356SBlue Swirl return 0; 137620d97356SBlue Swirl } 137720d97356SBlue Swirl 137820d97356SBlue Swirl if (nb_sectors != s->cluster_sectors) 137920d97356SBlue Swirl return -EINVAL; 138020d97356SBlue Swirl 13817267c094SAnthony Liguori out_buf = g_malloc(s->cluster_size + (s->cluster_size / 1000) + 128); 138220d97356SBlue Swirl 138320d97356SBlue Swirl /* best compression, small window, no zlib header */ 138420d97356SBlue Swirl memset(&strm, 0, sizeof(strm)); 138520d97356SBlue Swirl ret = deflateInit2(&strm, Z_DEFAULT_COMPRESSION, 138620d97356SBlue Swirl Z_DEFLATED, -12, 138720d97356SBlue Swirl 9, Z_DEFAULT_STRATEGY); 138820d97356SBlue Swirl if (ret != 0) { 13898f1efd00SKevin Wolf ret = -EINVAL; 13908f1efd00SKevin Wolf goto fail; 139120d97356SBlue Swirl } 139220d97356SBlue Swirl 139320d97356SBlue Swirl strm.avail_in = s->cluster_size; 139420d97356SBlue Swirl strm.next_in = (uint8_t *)buf; 139520d97356SBlue Swirl strm.avail_out = s->cluster_size; 139620d97356SBlue Swirl strm.next_out = out_buf; 139720d97356SBlue Swirl 139820d97356SBlue Swirl ret = deflate(&strm, Z_FINISH); 139920d97356SBlue Swirl if (ret != Z_STREAM_END && ret != Z_OK) { 140020d97356SBlue Swirl deflateEnd(&strm); 14018f1efd00SKevin Wolf ret = -EINVAL; 14028f1efd00SKevin Wolf goto fail; 140320d97356SBlue Swirl } 140420d97356SBlue Swirl out_len = strm.next_out - out_buf; 140520d97356SBlue Swirl 140620d97356SBlue Swirl deflateEnd(&strm); 140720d97356SBlue Swirl 140820d97356SBlue Swirl if (ret != Z_STREAM_END || out_len >= s->cluster_size) { 140920d97356SBlue Swirl /* could not compress: write normal cluster */ 14108f1efd00SKevin Wolf ret = bdrv_write(bs, sector_num, buf, s->cluster_sectors); 14118f1efd00SKevin Wolf if (ret < 0) { 14128f1efd00SKevin Wolf goto fail; 14138f1efd00SKevin Wolf } 141420d97356SBlue Swirl } else { 141520d97356SBlue Swirl cluster_offset = qcow2_alloc_compressed_cluster_offset(bs, 141620d97356SBlue Swirl sector_num << 9, out_len); 14178f1efd00SKevin Wolf if (!cluster_offset) { 14188f1efd00SKevin Wolf ret = -EIO; 14198f1efd00SKevin Wolf goto fail; 14208f1efd00SKevin Wolf } 142120d97356SBlue Swirl cluster_offset &= s->cluster_offset_mask; 142266f82ceeSKevin Wolf BLKDBG_EVENT(bs->file, BLKDBG_WRITE_COMPRESSED); 14238f1efd00SKevin Wolf ret = bdrv_pwrite(bs->file, cluster_offset, out_buf, out_len); 14248f1efd00SKevin Wolf if (ret < 0) { 14258f1efd00SKevin Wolf goto fail; 142620d97356SBlue Swirl } 142720d97356SBlue Swirl } 142820d97356SBlue Swirl 14298f1efd00SKevin Wolf ret = 0; 14308f1efd00SKevin Wolf fail: 14317267c094SAnthony Liguori g_free(out_buf); 14328f1efd00SKevin Wolf return ret; 143320d97356SBlue Swirl } 143420d97356SBlue Swirl 1435a968168cSDong Xu Wang static coroutine_fn int qcow2_co_flush_to_os(BlockDriverState *bs) 143620d97356SBlue Swirl { 143729c1a730SKevin Wolf BDRVQcowState *s = bs->opaque; 143829c1a730SKevin Wolf int ret; 143929c1a730SKevin Wolf 14408b94ff85SPaolo Bonzini qemu_co_mutex_lock(&s->lock); 144129c1a730SKevin Wolf ret = qcow2_cache_flush(bs, s->l2_table_cache); 144229c1a730SKevin Wolf if (ret < 0) { 1443c95de7e2SDong Xu Wang qemu_co_mutex_unlock(&s->lock); 14448b94ff85SPaolo Bonzini return ret; 144529c1a730SKevin Wolf } 144629c1a730SKevin Wolf 144729c1a730SKevin Wolf ret = qcow2_cache_flush(bs, s->refcount_block_cache); 144829c1a730SKevin Wolf if (ret < 0) { 1449c95de7e2SDong Xu Wang qemu_co_mutex_unlock(&s->lock); 14508b94ff85SPaolo Bonzini return ret; 145129c1a730SKevin Wolf } 14528b94ff85SPaolo Bonzini qemu_co_mutex_unlock(&s->lock); 145329c1a730SKevin Wolf 1454eb489bb1SKevin Wolf return 0; 1455eb489bb1SKevin Wolf } 1456eb489bb1SKevin Wolf 14577c80ab3fSJes Sorensen static int64_t qcow2_vm_state_offset(BDRVQcowState *s) 145820d97356SBlue Swirl { 145920d97356SBlue Swirl return (int64_t)s->l1_vm_state_index << (s->cluster_bits + s->l2_bits); 146020d97356SBlue Swirl } 146120d97356SBlue Swirl 14627c80ab3fSJes Sorensen static int qcow2_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) 146320d97356SBlue Swirl { 146420d97356SBlue Swirl BDRVQcowState *s = bs->opaque; 146520d97356SBlue Swirl bdi->cluster_size = s->cluster_size; 14667c80ab3fSJes Sorensen bdi->vm_state_offset = qcow2_vm_state_offset(s); 146720d97356SBlue Swirl return 0; 146820d97356SBlue Swirl } 146920d97356SBlue Swirl 147020d97356SBlue Swirl 14714534ff54SKevin Wolf static int qcow2_check(BlockDriverState *bs, BdrvCheckResult *result, 14724534ff54SKevin Wolf BdrvCheckMode fix) 147320d97356SBlue Swirl { 1474166acf54SKevin Wolf return qcow2_check_refcounts(bs, result, fix); 147520d97356SBlue Swirl } 147620d97356SBlue Swirl 147720d97356SBlue Swirl #if 0 147820d97356SBlue Swirl static void dump_refcounts(BlockDriverState *bs) 147920d97356SBlue Swirl { 148020d97356SBlue Swirl BDRVQcowState *s = bs->opaque; 148120d97356SBlue Swirl int64_t nb_clusters, k, k1, size; 148220d97356SBlue Swirl int refcount; 148320d97356SBlue Swirl 148466f82ceeSKevin Wolf size = bdrv_getlength(bs->file); 148520d97356SBlue Swirl nb_clusters = size_to_clusters(s, size); 148620d97356SBlue Swirl for(k = 0; k < nb_clusters;) { 148720d97356SBlue Swirl k1 = k; 148820d97356SBlue Swirl refcount = get_refcount(bs, k); 148920d97356SBlue Swirl k++; 149020d97356SBlue Swirl while (k < nb_clusters && get_refcount(bs, k) == refcount) 149120d97356SBlue Swirl k++; 14920bfcd599SBlue Swirl printf("%" PRId64 ": refcount=%d nb=%" PRId64 "\n", k, refcount, 14930bfcd599SBlue Swirl k - k1); 149420d97356SBlue Swirl } 149520d97356SBlue Swirl } 149620d97356SBlue Swirl #endif 149720d97356SBlue Swirl 14987c80ab3fSJes Sorensen static int qcow2_save_vmstate(BlockDriverState *bs, const uint8_t *buf, 149920d97356SBlue Swirl int64_t pos, int size) 150020d97356SBlue Swirl { 150120d97356SBlue Swirl BDRVQcowState *s = bs->opaque; 150220d97356SBlue Swirl int growable = bs->growable; 150320d97356SBlue Swirl int ret; 150420d97356SBlue Swirl 150566f82ceeSKevin Wolf BLKDBG_EVENT(bs->file, BLKDBG_VMSTATE_SAVE); 150620d97356SBlue Swirl bs->growable = 1; 15077c80ab3fSJes Sorensen ret = bdrv_pwrite(bs, qcow2_vm_state_offset(s) + pos, buf, size); 150820d97356SBlue Swirl bs->growable = growable; 150920d97356SBlue Swirl 151020d97356SBlue Swirl return ret; 151120d97356SBlue Swirl } 151220d97356SBlue Swirl 15137c80ab3fSJes Sorensen static int qcow2_load_vmstate(BlockDriverState *bs, uint8_t *buf, 151420d97356SBlue Swirl int64_t pos, int size) 151520d97356SBlue Swirl { 151620d97356SBlue Swirl BDRVQcowState *s = bs->opaque; 151720d97356SBlue Swirl int growable = bs->growable; 151820d97356SBlue Swirl int ret; 151920d97356SBlue Swirl 152066f82ceeSKevin Wolf BLKDBG_EVENT(bs->file, BLKDBG_VMSTATE_LOAD); 152120d97356SBlue Swirl bs->growable = 1; 15227c80ab3fSJes Sorensen ret = bdrv_pread(bs, qcow2_vm_state_offset(s) + pos, buf, size); 152320d97356SBlue Swirl bs->growable = growable; 152420d97356SBlue Swirl 152520d97356SBlue Swirl return ret; 152620d97356SBlue Swirl } 152720d97356SBlue Swirl 15287c80ab3fSJes Sorensen static QEMUOptionParameter qcow2_create_options[] = { 152920d97356SBlue Swirl { 153020d97356SBlue Swirl .name = BLOCK_OPT_SIZE, 153120d97356SBlue Swirl .type = OPT_SIZE, 153220d97356SBlue Swirl .help = "Virtual disk size" 153320d97356SBlue Swirl }, 153420d97356SBlue Swirl { 15356744cbabSKevin Wolf .name = BLOCK_OPT_COMPAT_LEVEL, 15366744cbabSKevin Wolf .type = OPT_STRING, 15376744cbabSKevin Wolf .help = "Compatibility level (0.10 or 1.1)" 15386744cbabSKevin Wolf }, 15396744cbabSKevin Wolf { 154020d97356SBlue Swirl .name = BLOCK_OPT_BACKING_FILE, 154120d97356SBlue Swirl .type = OPT_STRING, 154220d97356SBlue Swirl .help = "File name of a base image" 154320d97356SBlue Swirl }, 154420d97356SBlue Swirl { 154520d97356SBlue Swirl .name = BLOCK_OPT_BACKING_FMT, 154620d97356SBlue Swirl .type = OPT_STRING, 154720d97356SBlue Swirl .help = "Image format of the base image" 154820d97356SBlue Swirl }, 154920d97356SBlue Swirl { 155020d97356SBlue Swirl .name = BLOCK_OPT_ENCRYPT, 155120d97356SBlue Swirl .type = OPT_FLAG, 155220d97356SBlue Swirl .help = "Encrypt the image" 155320d97356SBlue Swirl }, 155420d97356SBlue Swirl { 155520d97356SBlue Swirl .name = BLOCK_OPT_CLUSTER_SIZE, 155620d97356SBlue Swirl .type = OPT_SIZE, 155799cce9faSKevin Wolf .help = "qcow2 cluster size", 155899cce9faSKevin Wolf .value = { .n = DEFAULT_CLUSTER_SIZE }, 155920d97356SBlue Swirl }, 156020d97356SBlue Swirl { 156120d97356SBlue Swirl .name = BLOCK_OPT_PREALLOC, 156220d97356SBlue Swirl .type = OPT_STRING, 156320d97356SBlue Swirl .help = "Preallocation mode (allowed values: off, metadata)" 156420d97356SBlue Swirl }, 156520d97356SBlue Swirl { NULL } 156620d97356SBlue Swirl }; 156720d97356SBlue Swirl 156820d97356SBlue Swirl static BlockDriver bdrv_qcow2 = { 156920d97356SBlue Swirl .format_name = "qcow2", 157020d97356SBlue Swirl .instance_size = sizeof(BDRVQcowState), 15717c80ab3fSJes Sorensen .bdrv_probe = qcow2_probe, 15727c80ab3fSJes Sorensen .bdrv_open = qcow2_open, 15737c80ab3fSJes Sorensen .bdrv_close = qcow2_close, 15747c80ab3fSJes Sorensen .bdrv_create = qcow2_create, 1575f8a2e5e3SStefan Hajnoczi .bdrv_co_is_allocated = qcow2_co_is_allocated, 15767c80ab3fSJes Sorensen .bdrv_set_key = qcow2_set_key, 15777c80ab3fSJes Sorensen .bdrv_make_empty = qcow2_make_empty, 157820d97356SBlue Swirl 157968d100e9SKevin Wolf .bdrv_co_readv = qcow2_co_readv, 158068d100e9SKevin Wolf .bdrv_co_writev = qcow2_co_writev, 1581eb489bb1SKevin Wolf .bdrv_co_flush_to_os = qcow2_co_flush_to_os, 1582419b19d9SStefan Hajnoczi 1583621f0589SKevin Wolf .bdrv_co_write_zeroes = qcow2_co_write_zeroes, 15846db39ae2SPaolo Bonzini .bdrv_co_discard = qcow2_co_discard, 1585419b19d9SStefan Hajnoczi .bdrv_truncate = qcow2_truncate, 15867c80ab3fSJes Sorensen .bdrv_write_compressed = qcow2_write_compressed, 158720d97356SBlue Swirl 158820d97356SBlue Swirl .bdrv_snapshot_create = qcow2_snapshot_create, 158920d97356SBlue Swirl .bdrv_snapshot_goto = qcow2_snapshot_goto, 159020d97356SBlue Swirl .bdrv_snapshot_delete = qcow2_snapshot_delete, 159120d97356SBlue Swirl .bdrv_snapshot_list = qcow2_snapshot_list, 159251ef6727Sedison .bdrv_snapshot_load_tmp = qcow2_snapshot_load_tmp, 15937c80ab3fSJes Sorensen .bdrv_get_info = qcow2_get_info, 159420d97356SBlue Swirl 15957c80ab3fSJes Sorensen .bdrv_save_vmstate = qcow2_save_vmstate, 15967c80ab3fSJes Sorensen .bdrv_load_vmstate = qcow2_load_vmstate, 159720d97356SBlue Swirl 159820d97356SBlue Swirl .bdrv_change_backing_file = qcow2_change_backing_file, 159920d97356SBlue Swirl 160006d9260fSAnthony Liguori .bdrv_invalidate_cache = qcow2_invalidate_cache, 160106d9260fSAnthony Liguori 16027c80ab3fSJes Sorensen .create_options = qcow2_create_options, 16037c80ab3fSJes Sorensen .bdrv_check = qcow2_check, 160420d97356SBlue Swirl }; 160520d97356SBlue Swirl 16065efa9d5aSAnthony Liguori static void bdrv_qcow2_init(void) 16075efa9d5aSAnthony Liguori { 16085efa9d5aSAnthony Liguori bdrv_register(&bdrv_qcow2); 16095efa9d5aSAnthony Liguori } 16105efa9d5aSAnthony Liguori 16115efa9d5aSAnthony Liguori block_init(bdrv_qcow2_init); 1612