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author | Upstream <upstream-import@none> | 1970-01-12 13:46:40 +0000 |
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committer | Upstream <upstream-import@none> | 1970-01-12 13:46:40 +0000 |
commit | 413f05aaf54fa08c0ae7e997327a4f4a473c0a8d (patch) | |
tree | 642d637ab01ee6c54ca27d1fa96cf92a32df8053 /block-vmdk.c | |
download | external_qemu-413f05aaf54fa08c0ae7e997327a4f4a473c0a8d.zip external_qemu-413f05aaf54fa08c0ae7e997327a4f4a473c0a8d.tar.gz external_qemu-413f05aaf54fa08c0ae7e997327a4f4a473c0a8d.tar.bz2 |
external/qemu 0.8.2
Diffstat (limited to 'block-vmdk.c')
-rw-r--r-- | block-vmdk.c | 446 |
1 files changed, 446 insertions, 0 deletions
diff --git a/block-vmdk.c b/block-vmdk.c new file mode 100644 index 0000000..4cc3db8 --- /dev/null +++ b/block-vmdk.c @@ -0,0 +1,446 @@ +/* + * Block driver for the VMDK format + * + * Copyright (c) 2004 Fabrice Bellard + * Copyright (c) 2005 Filip Navara + * + * Permission is hereby granted, free of charge, to any person obtaining a copy + * of this software and associated documentation files (the "Software"), to deal + * in the Software without restriction, including without limitation the rights + * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell + * copies of the Software, and to permit persons to whom the Software is + * furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN + * THE SOFTWARE. + */ +#include "vl.h" +#include "block_int.h" + +#define VMDK3_MAGIC (('C' << 24) | ('O' << 16) | ('W' << 8) | 'D') +#define VMDK4_MAGIC (('K' << 24) | ('D' << 16) | ('M' << 8) | 'V') + +typedef struct { + uint32_t version; + uint32_t flags; + uint32_t disk_sectors; + uint32_t granularity; + uint32_t l1dir_offset; + uint32_t l1dir_size; + uint32_t file_sectors; + uint32_t cylinders; + uint32_t heads; + uint32_t sectors_per_track; +} VMDK3Header; + +typedef struct { + uint32_t version; + uint32_t flags; + int64_t capacity; + int64_t granularity; + int64_t desc_offset; + int64_t desc_size; + int32_t num_gtes_per_gte; + int64_t rgd_offset; + int64_t gd_offset; + int64_t grain_offset; + char filler[1]; + char check_bytes[4]; +} __attribute__((packed)) VMDK4Header; + +#define L2_CACHE_SIZE 16 + +typedef struct BDRVVmdkState { + int fd; + int64_t l1_table_offset; + int64_t l1_backup_table_offset; + uint32_t *l1_table; + uint32_t *l1_backup_table; + unsigned int l1_size; + uint32_t l1_entry_sectors; + + unsigned int l2_size; + uint32_t *l2_cache; + uint32_t l2_cache_offsets[L2_CACHE_SIZE]; + uint32_t l2_cache_counts[L2_CACHE_SIZE]; + + unsigned int cluster_sectors; +} BDRVVmdkState; + +static int vmdk_probe(const uint8_t *buf, int buf_size, const char *filename) +{ + uint32_t magic; + + if (buf_size < 4) + return 0; + magic = be32_to_cpu(*(uint32_t *)buf); + if (magic == VMDK3_MAGIC || + magic == VMDK4_MAGIC) + return 100; + else + return 0; +} + +static int vmdk_open(BlockDriverState *bs, const char *filename) +{ + BDRVVmdkState *s = bs->opaque; + int fd, i; + uint32_t magic; + int l1_size; + + fd = open(filename, O_RDWR | O_BINARY | O_LARGEFILE); + if (fd < 0) { + fd = open(filename, O_RDONLY | O_BINARY | O_LARGEFILE); + if (fd < 0) + return -1; + bs->read_only = 1; + } + if (read(fd, &magic, sizeof(magic)) != sizeof(magic)) + goto fail; + magic = be32_to_cpu(magic); + if (magic == VMDK3_MAGIC) { + VMDK3Header header; + if (read(fd, &header, sizeof(header)) != + sizeof(header)) + goto fail; + s->cluster_sectors = le32_to_cpu(header.granularity); + s->l2_size = 1 << 9; + s->l1_size = 1 << 6; + bs->total_sectors = le32_to_cpu(header.disk_sectors); + s->l1_table_offset = le32_to_cpu(header.l1dir_offset) << 9; + s->l1_backup_table_offset = 0; + s->l1_entry_sectors = s->l2_size * s->cluster_sectors; + } else if (magic == VMDK4_MAGIC) { + VMDK4Header header; + + if (read(fd, &header, sizeof(header)) != sizeof(header)) + goto fail; + bs->total_sectors = le64_to_cpu(header.capacity); + s->cluster_sectors = le64_to_cpu(header.granularity); + s->l2_size = le32_to_cpu(header.num_gtes_per_gte); + s->l1_entry_sectors = s->l2_size * s->cluster_sectors; + if (s->l1_entry_sectors <= 0) + goto fail; + s->l1_size = (bs->total_sectors + s->l1_entry_sectors - 1) + / s->l1_entry_sectors; + s->l1_table_offset = le64_to_cpu(header.rgd_offset) << 9; + s->l1_backup_table_offset = le64_to_cpu(header.gd_offset) << 9; + } else { + goto fail; + } + /* read the L1 table */ + l1_size = s->l1_size * sizeof(uint32_t); + s->l1_table = qemu_malloc(l1_size); + if (!s->l1_table) + goto fail; + if (lseek(fd, s->l1_table_offset, SEEK_SET) == -1) + goto fail; + if (read(fd, s->l1_table, l1_size) != l1_size) + goto fail; + for(i = 0; i < s->l1_size; i++) { + le32_to_cpus(&s->l1_table[i]); + } + + if (s->l1_backup_table_offset) { + s->l1_backup_table = qemu_malloc(l1_size); + if (!s->l1_backup_table) + goto fail; + if (lseek(fd, s->l1_backup_table_offset, SEEK_SET) == -1) + goto fail; + if (read(fd, s->l1_backup_table, l1_size) != l1_size) + goto fail; + for(i = 0; i < s->l1_size; i++) { + le32_to_cpus(&s->l1_backup_table[i]); + } + } + + s->l2_cache = qemu_malloc(s->l2_size * L2_CACHE_SIZE * sizeof(uint32_t)); + if (!s->l2_cache) + goto fail; + s->fd = fd; + return 0; + fail: + qemu_free(s->l1_backup_table); + qemu_free(s->l1_table); + qemu_free(s->l2_cache); + close(fd); + return -1; +} + +static uint64_t get_cluster_offset(BlockDriverState *bs, + uint64_t offset, int allocate) +{ + BDRVVmdkState *s = bs->opaque; + unsigned int l1_index, l2_offset, l2_index; + int min_index, i, j; + uint32_t min_count, *l2_table, tmp; + uint64_t cluster_offset; + + l1_index = (offset >> 9) / s->l1_entry_sectors; + if (l1_index >= s->l1_size) + return 0; + l2_offset = s->l1_table[l1_index]; + if (!l2_offset) + return 0; + for(i = 0; i < L2_CACHE_SIZE; i++) { + if (l2_offset == s->l2_cache_offsets[i]) { + /* increment the hit count */ + if (++s->l2_cache_counts[i] == 0xffffffff) { + for(j = 0; j < L2_CACHE_SIZE; j++) { + s->l2_cache_counts[j] >>= 1; + } + } + l2_table = s->l2_cache + (i * s->l2_size); + goto found; + } + } + /* not found: load a new entry in the least used one */ + min_index = 0; + min_count = 0xffffffff; + for(i = 0; i < L2_CACHE_SIZE; i++) { + if (s->l2_cache_counts[i] < min_count) { + min_count = s->l2_cache_counts[i]; + min_index = i; + } + } + l2_table = s->l2_cache + (min_index * s->l2_size); + lseek(s->fd, (int64_t)l2_offset * 512, SEEK_SET); + if (read(s->fd, l2_table, s->l2_size * sizeof(uint32_t)) != + s->l2_size * sizeof(uint32_t)) + return 0; + s->l2_cache_offsets[min_index] = l2_offset; + s->l2_cache_counts[min_index] = 1; + found: + l2_index = ((offset >> 9) / s->cluster_sectors) % s->l2_size; + cluster_offset = le32_to_cpu(l2_table[l2_index]); + if (!cluster_offset) { + if (!allocate) + return 0; + cluster_offset = lseek(s->fd, 0, SEEK_END); + ftruncate(s->fd, cluster_offset + (s->cluster_sectors << 9)); + cluster_offset >>= 9; + /* update L2 table */ + tmp = cpu_to_le32(cluster_offset); + l2_table[l2_index] = tmp; + lseek(s->fd, ((int64_t)l2_offset * 512) + (l2_index * sizeof(tmp)), SEEK_SET); + if (write(s->fd, &tmp, sizeof(tmp)) != sizeof(tmp)) + return 0; + /* update backup L2 table */ + if (s->l1_backup_table_offset != 0) { + l2_offset = s->l1_backup_table[l1_index]; + lseek(s->fd, ((int64_t)l2_offset * 512) + (l2_index * sizeof(tmp)), SEEK_SET); + if (write(s->fd, &tmp, sizeof(tmp)) != sizeof(tmp)) + return 0; + } + } + cluster_offset <<= 9; + return cluster_offset; +} + +static int vmdk_is_allocated(BlockDriverState *bs, int64_t sector_num, + int nb_sectors, int *pnum) +{ + BDRVVmdkState *s = bs->opaque; + int index_in_cluster, n; + uint64_t cluster_offset; + + cluster_offset = get_cluster_offset(bs, sector_num << 9, 0); + index_in_cluster = sector_num % s->cluster_sectors; + n = s->cluster_sectors - index_in_cluster; + if (n > nb_sectors) + n = nb_sectors; + *pnum = n; + return (cluster_offset != 0); +} + +static int vmdk_read(BlockDriverState *bs, int64_t sector_num, + uint8_t *buf, int nb_sectors) +{ + BDRVVmdkState *s = bs->opaque; + int ret, index_in_cluster, n; + uint64_t cluster_offset; + + while (nb_sectors > 0) { + cluster_offset = get_cluster_offset(bs, sector_num << 9, 0); + index_in_cluster = sector_num % s->cluster_sectors; + n = s->cluster_sectors - index_in_cluster; + if (n > nb_sectors) + n = nb_sectors; + if (!cluster_offset) { + memset(buf, 0, 512 * n); + } else { + lseek(s->fd, cluster_offset + index_in_cluster * 512, SEEK_SET); + ret = read(s->fd, buf, n * 512); + if (ret != n * 512) + return -1; + } + nb_sectors -= n; + sector_num += n; + buf += n * 512; + } + return 0; +} + +static int vmdk_write(BlockDriverState *bs, int64_t sector_num, + const uint8_t *buf, int nb_sectors) +{ + BDRVVmdkState *s = bs->opaque; + int ret, index_in_cluster, n; + uint64_t cluster_offset; + + while (nb_sectors > 0) { + index_in_cluster = sector_num & (s->cluster_sectors - 1); + n = s->cluster_sectors - index_in_cluster; + if (n > nb_sectors) + n = nb_sectors; + cluster_offset = get_cluster_offset(bs, sector_num << 9, 1); + if (!cluster_offset) + return -1; + lseek(s->fd, cluster_offset + index_in_cluster * 512, SEEK_SET); + ret = write(s->fd, buf, n * 512); + if (ret != n * 512) + return -1; + nb_sectors -= n; + sector_num += n; + buf += n * 512; + } + return 0; +} + +static int vmdk_create(const char *filename, int64_t total_size, + const char *backing_file, int flags) +{ + int fd, i; + VMDK4Header header; + uint32_t tmp, magic, grains, gd_size, gt_size, gt_count; + char *desc_template = + "# Disk DescriptorFile\n" + "version=1\n" + "CID=%x\n" + "parentCID=ffffffff\n" + "createType=\"monolithicSparse\"\n" + "\n" + "# Extent description\n" + "RW %lu SPARSE \"%s\"\n" + "\n" + "# The Disk Data Base \n" + "#DDB\n" + "\n" + "ddb.virtualHWVersion = \"3\"\n" + "ddb.geometry.cylinders = \"%lu\"\n" + "ddb.geometry.heads = \"16\"\n" + "ddb.geometry.sectors = \"63\"\n" + "ddb.adapterType = \"ide\"\n"; + char desc[1024]; + const char *real_filename, *temp_str; + + /* XXX: add support for backing file */ + + fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY | O_LARGEFILE, + 0644); + if (fd < 0) + return -1; + magic = cpu_to_be32(VMDK4_MAGIC); + memset(&header, 0, sizeof(header)); + header.version = cpu_to_le32(1); + header.flags = cpu_to_le32(3); /* ?? */ + header.capacity = cpu_to_le64(total_size); + header.granularity = cpu_to_le64(128); + header.num_gtes_per_gte = cpu_to_le32(512); + + grains = (total_size + header.granularity - 1) / header.granularity; + gt_size = ((header.num_gtes_per_gte * sizeof(uint32_t)) + 511) >> 9; + gt_count = (grains + header.num_gtes_per_gte - 1) / header.num_gtes_per_gte; + gd_size = (gt_count * sizeof(uint32_t) + 511) >> 9; + + header.desc_offset = 1; + header.desc_size = 20; + header.rgd_offset = header.desc_offset + header.desc_size; + header.gd_offset = header.rgd_offset + gd_size + (gt_size * gt_count); + header.grain_offset = + ((header.gd_offset + gd_size + (gt_size * gt_count) + + header.granularity - 1) / header.granularity) * + header.granularity; + + header.desc_offset = cpu_to_le64(header.desc_offset); + header.desc_size = cpu_to_le64(header.desc_size); + header.rgd_offset = cpu_to_le64(header.rgd_offset); + header.gd_offset = cpu_to_le64(header.gd_offset); + header.grain_offset = cpu_to_le64(header.grain_offset); + + header.check_bytes[0] = 0xa; + header.check_bytes[1] = 0x20; + header.check_bytes[2] = 0xd; + header.check_bytes[3] = 0xa; + + /* write all the data */ + write(fd, &magic, sizeof(magic)); + write(fd, &header, sizeof(header)); + + ftruncate(fd, header.grain_offset << 9); + + /* write grain directory */ + lseek(fd, le64_to_cpu(header.rgd_offset) << 9, SEEK_SET); + for (i = 0, tmp = header.rgd_offset + gd_size; + i < gt_count; i++, tmp += gt_size) + write(fd, &tmp, sizeof(tmp)); + + /* write backup grain directory */ + lseek(fd, le64_to_cpu(header.gd_offset) << 9, SEEK_SET); + for (i = 0, tmp = header.gd_offset + gd_size; + i < gt_count; i++, tmp += gt_size) + write(fd, &tmp, sizeof(tmp)); + + /* compose the descriptor */ + real_filename = filename; + if ((temp_str = strrchr(real_filename, '\\')) != NULL) + real_filename = temp_str + 1; + if ((temp_str = strrchr(real_filename, '/')) != NULL) + real_filename = temp_str + 1; + if ((temp_str = strrchr(real_filename, ':')) != NULL) + real_filename = temp_str + 1; + sprintf(desc, desc_template, time(NULL), (unsigned long)total_size, + real_filename, total_size / (63 * 16)); + + /* write the descriptor */ + lseek(fd, le64_to_cpu(header.desc_offset) << 9, SEEK_SET); + write(fd, desc, strlen(desc)); + + close(fd); + return 0; +} + +static void vmdk_close(BlockDriverState *bs) +{ + BDRVVmdkState *s = bs->opaque; + qemu_free(s->l1_table); + qemu_free(s->l2_cache); + close(s->fd); +} + +static void vmdk_flush(BlockDriverState *bs) +{ + BDRVVmdkState *s = bs->opaque; + fsync(s->fd); +} + +BlockDriver bdrv_vmdk = { + "vmdk", + sizeof(BDRVVmdkState), + vmdk_probe, + vmdk_open, + vmdk_read, + vmdk_write, + vmdk_close, + vmdk_create, + vmdk_flush, + vmdk_is_allocated, +}; |