diff options
Diffstat (limited to 'block-vmdk.c')
| -rw-r--r-- | block-vmdk.c | 834 |
1 files changed, 834 insertions, 0 deletions
diff --git a/block-vmdk.c b/block-vmdk.c new file mode 100644 index 0000000..8d67c2f --- /dev/null +++ b/block-vmdk.c @@ -0,0 +1,834 @@ +/* + * 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 "qemu-common.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 { + BlockDriverState *hd; + 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; + uint32_t parent_cid; + int is_parent; +} BDRVVmdkState; + +typedef struct VmdkMetaData { + uint32_t offset; + unsigned int l1_index; + unsigned int l2_index; + unsigned int l2_offset; + int valid; +} VmdkMetaData; + +typedef struct ActiveBDRVState{ + BlockDriverState *hd; // active image handler + uint64_t cluster_offset; // current write offset +}ActiveBDRVState; + +static ActiveBDRVState activeBDRV; + + +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; +} + +#define CHECK_CID 1 + +#define SECTOR_SIZE 512 +#define DESC_SIZE 20*SECTOR_SIZE // 20 sectors of 512 bytes each +#define HEADER_SIZE 512 // first sector of 512 bytes + +static uint32_t vmdk_read_cid(BlockDriverState *bs, int parent) +{ + BDRVVmdkState *s = bs->opaque; + char desc[DESC_SIZE]; + uint32_t cid; + const char *p_name, *cid_str; + size_t cid_str_size; + + /* the descriptor offset = 0x200 */ + if (bdrv_pread(s->hd, 0x200, desc, DESC_SIZE) != DESC_SIZE) + return 0; + + if (parent) { + cid_str = "parentCID"; + cid_str_size = sizeof("parentCID"); + } else { + cid_str = "CID"; + cid_str_size = sizeof("CID"); + } + + if ((p_name = strstr(desc,cid_str)) != 0) { + p_name += cid_str_size; + sscanf(p_name,"%x",&cid); + } + + return cid; +} + +static int vmdk_write_cid(BlockDriverState *bs, uint32_t cid) +{ + BDRVVmdkState *s = bs->opaque; + char desc[DESC_SIZE], tmp_desc[DESC_SIZE]; + char *p_name, *tmp_str; + + /* the descriptor offset = 0x200 */ + if (bdrv_pread(s->hd, 0x200, desc, DESC_SIZE) != DESC_SIZE) + return -1; + + tmp_str = strstr(desc,"parentCID"); + pstrcpy(tmp_desc, sizeof(tmp_desc), tmp_str); + if ((p_name = strstr(desc,"CID")) != 0) { + p_name += sizeof("CID"); + snprintf(p_name, sizeof(desc) - (p_name - desc), "%x\n", cid); + pstrcat(desc, sizeof(desc), tmp_desc); + } + + if (bdrv_pwrite(s->hd, 0x200, desc, DESC_SIZE) != DESC_SIZE) + return -1; + return 0; +} + +static int vmdk_is_cid_valid(BlockDriverState *bs) +{ +#ifdef CHECK_CID + BDRVVmdkState *s = bs->opaque; + BlockDriverState *p_bs = s->hd->backing_hd; + uint32_t cur_pcid; + + if (p_bs) { + cur_pcid = vmdk_read_cid(p_bs,0); + if (s->parent_cid != cur_pcid) + // CID not valid + return 0; + } +#endif + // CID valid + return 1; +} + +static int vmdk_snapshot_create(const char *filename, const char *backing_file) +{ + int snp_fd, p_fd; + uint32_t p_cid; + char *p_name, *gd_buf, *rgd_buf; + const char *real_filename, *temp_str; + VMDK4Header header; + uint32_t gde_entries, gd_size; + int64_t gd_offset, rgd_offset, capacity, gt_size; + char p_desc[DESC_SIZE], s_desc[DESC_SIZE], hdr[HEADER_SIZE]; + static const char desc_template[] = + "# Disk DescriptorFile\n" + "version=1\n" + "CID=%x\n" + "parentCID=%x\n" + "createType=\"monolithicSparse\"\n" + "parentFileNameHint=\"%s\"\n" + "\n" + "# Extent description\n" + "RW %u SPARSE \"%s\"\n" + "\n" + "# The Disk Data Base \n" + "#DDB\n" + "\n"; + + snp_fd = open(filename, O_RDWR | O_CREAT | O_TRUNC | O_BINARY | O_LARGEFILE, 0644); + if (snp_fd < 0) + return -1; + p_fd = open(backing_file, O_RDONLY | O_BINARY | O_LARGEFILE); + if (p_fd < 0) { + close(snp_fd); + return -1; + } + + /* read the header */ + if (lseek(p_fd, 0x0, SEEK_SET) == -1) + goto fail; + if (read(p_fd, hdr, HEADER_SIZE) != HEADER_SIZE) + goto fail; + + /* write the header */ + if (lseek(snp_fd, 0x0, SEEK_SET) == -1) + goto fail; + if (write(snp_fd, hdr, HEADER_SIZE) == -1) + goto fail; + + memset(&header, 0, sizeof(header)); + memcpy(&header,&hdr[4], sizeof(header)); // skip the VMDK4_MAGIC + + ftruncate(snp_fd, header.grain_offset << 9); + /* the descriptor offset = 0x200 */ + if (lseek(p_fd, 0x200, SEEK_SET) == -1) + goto fail; + if (read(p_fd, p_desc, DESC_SIZE) != DESC_SIZE) + goto fail; + + if ((p_name = strstr(p_desc,"CID")) != 0) { + p_name += sizeof("CID"); + sscanf(p_name,"%x",&p_cid); + } + + 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; + + snprintf(s_desc, sizeof(s_desc), desc_template, p_cid, p_cid, backing_file, + (uint32_t)header.capacity, real_filename); + + /* write the descriptor */ + if (lseek(snp_fd, 0x200, SEEK_SET) == -1) + goto fail; + if (write(snp_fd, s_desc, strlen(s_desc)) == -1) + goto fail; + + gd_offset = header.gd_offset * SECTOR_SIZE; // offset of GD table + rgd_offset = header.rgd_offset * SECTOR_SIZE; // offset of RGD table + capacity = header.capacity * SECTOR_SIZE; // Extent size + /* + * Each GDE span 32M disk, means: + * 512 GTE per GT, each GTE points to grain + */ + gt_size = (int64_t)header.num_gtes_per_gte * header.granularity * SECTOR_SIZE; + if (!gt_size) + goto fail; + gde_entries = (uint32_t)(capacity / gt_size); // number of gde/rgde + gd_size = gde_entries * sizeof(uint32_t); + + /* write RGD */ + rgd_buf = qemu_malloc(gd_size); + if (!rgd_buf) + goto fail; + if (lseek(p_fd, rgd_offset, SEEK_SET) == -1) + goto fail_rgd; + if (read(p_fd, rgd_buf, gd_size) != gd_size) + goto fail_rgd; + if (lseek(snp_fd, rgd_offset, SEEK_SET) == -1) + goto fail_rgd; + if (write(snp_fd, rgd_buf, gd_size) == -1) + goto fail_rgd; + qemu_free(rgd_buf); + + /* write GD */ + gd_buf = qemu_malloc(gd_size); + if (!gd_buf) + goto fail_rgd; + if (lseek(p_fd, gd_offset, SEEK_SET) == -1) + goto fail_gd; + if (read(p_fd, gd_buf, gd_size) != gd_size) + goto fail_gd; + if (lseek(snp_fd, gd_offset, SEEK_SET) == -1) + goto fail_gd; + if (write(snp_fd, gd_buf, gd_size) == -1) + goto fail_gd; + qemu_free(gd_buf); + + close(p_fd); + close(snp_fd); + return 0; + + fail_gd: + qemu_free(gd_buf); + fail_rgd: + qemu_free(rgd_buf); + fail: + close(p_fd); + close(snp_fd); + return -1; +} + +static void vmdk_parent_close(BlockDriverState *bs) +{ + if (bs->backing_hd) + bdrv_close(bs->backing_hd); +} + +int parent_open = 0; +static int vmdk_parent_open(BlockDriverState *bs, const char * filename) +{ + BDRVVmdkState *s = bs->opaque; + char *p_name; + char desc[DESC_SIZE]; + char parent_img_name[1024]; + + /* the descriptor offset = 0x200 */ + if (bdrv_pread(s->hd, 0x200, desc, DESC_SIZE) != DESC_SIZE) + return -1; + + if ((p_name = strstr(desc,"parentFileNameHint")) != 0) { + char *end_name; + struct stat file_buf; + + p_name += sizeof("parentFileNameHint") + 1; + if ((end_name = strchr(p_name,'\"')) == 0) + return -1; + if ((end_name - p_name) > sizeof (s->hd->backing_file) - 1) + return -1; + + strncpy(s->hd->backing_file, p_name, end_name - p_name); + if (stat(s->hd->backing_file, &file_buf) != 0) { + path_combine(parent_img_name, sizeof(parent_img_name), + filename, s->hd->backing_file); + } else { + pstrcpy(parent_img_name, sizeof(parent_img_name), + s->hd->backing_file); + } + + s->hd->backing_hd = bdrv_new(""); + if (!s->hd->backing_hd) { + failure: + bdrv_close(s->hd); + return -1; + } + parent_open = 1; + if (bdrv_open(s->hd->backing_hd, parent_img_name, BDRV_O_RDONLY) < 0) + goto failure; + parent_open = 0; + } + + return 0; +} + +static int vmdk_open(BlockDriverState *bs, const char *filename, int flags) +{ + BDRVVmdkState *s = bs->opaque; + uint32_t magic; + int l1_size, i, ret; + + if (parent_open) + // Parent must be opened as RO. + flags = BDRV_O_RDONLY; + + ret = bdrv_file_open(&s->hd, filename, flags); + if (ret < 0) + return ret; + if (bdrv_pread(s->hd, 0, &magic, sizeof(magic)) != sizeof(magic)) + goto fail; + + magic = be32_to_cpu(magic); + if (magic == VMDK3_MAGIC) { + VMDK3Header header; + + if (bdrv_pread(s->hd, sizeof(magic), &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 (bdrv_pread(s->hd, sizeof(magic), &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; + + if (parent_open) + s->is_parent = 1; + else + s->is_parent = 0; + + // try to open parent images, if exist + if (vmdk_parent_open(bs, filename) != 0) + goto fail; + // write the CID once after the image creation + s->parent_cid = vmdk_read_cid(bs,1); + } 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 (bdrv_pread(s->hd, s->l1_table_offset, 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 (bdrv_pread(s->hd, s->l1_backup_table_offset, 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; + return 0; + fail: + qemu_free(s->l1_backup_table); + qemu_free(s->l1_table); + qemu_free(s->l2_cache); + bdrv_delete(s->hd); + return -1; +} + +static uint64_t get_cluster_offset(BlockDriverState *bs, VmdkMetaData *m_data, + uint64_t offset, int allocate); + +static int get_whole_cluster(BlockDriverState *bs, uint64_t cluster_offset, + uint64_t offset, int allocate) +{ + uint64_t parent_cluster_offset; + BDRVVmdkState *s = bs->opaque; + uint8_t whole_grain[s->cluster_sectors*512]; // 128 sectors * 512 bytes each = grain size 64KB + + // we will be here if it's first write on non-exist grain(cluster). + // try to read from parent image, if exist + if (s->hd->backing_hd) { + BDRVVmdkState *ps = s->hd->backing_hd->opaque; + + if (!vmdk_is_cid_valid(bs)) + return -1; + + parent_cluster_offset = get_cluster_offset(s->hd->backing_hd, NULL, offset, allocate); + + if (parent_cluster_offset) { + BDRVVmdkState *act_s = activeBDRV.hd->opaque; + + if (bdrv_pread(ps->hd, parent_cluster_offset, whole_grain, ps->cluster_sectors*512) != ps->cluster_sectors*512) + return -1; + + //Write grain only into the active image + if (bdrv_pwrite(act_s->hd, activeBDRV.cluster_offset << 9, whole_grain, sizeof(whole_grain)) != sizeof(whole_grain)) + return -1; + } + } + return 0; +} + +static int vmdk_L2update(BlockDriverState *bs, VmdkMetaData *m_data) +{ + BDRVVmdkState *s = bs->opaque; + + /* update L2 table */ + if (bdrv_pwrite(s->hd, ((int64_t)m_data->l2_offset * 512) + (m_data->l2_index * sizeof(m_data->offset)), + &(m_data->offset), sizeof(m_data->offset)) != sizeof(m_data->offset)) + return -1; + /* update backup L2 table */ + if (s->l1_backup_table_offset != 0) { + m_data->l2_offset = s->l1_backup_table[m_data->l1_index]; + if (bdrv_pwrite(s->hd, ((int64_t)m_data->l2_offset * 512) + (m_data->l2_index * sizeof(m_data->offset)), + &(m_data->offset), sizeof(m_data->offset)) != sizeof(m_data->offset)) + return -1; + } + + return 0; +} + +static uint64_t get_cluster_offset(BlockDriverState *bs, VmdkMetaData *m_data, + 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 = 0; + uint64_t cluster_offset; + + if (m_data) + m_data->valid = 0; + + 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); + if (bdrv_pread(s->hd, (int64_t)l2_offset * 512, 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; + // Avoid the L2 tables update for the images that have snapshots. + if (!s->is_parent) { + cluster_offset = bdrv_getlength(s->hd); + bdrv_truncate(s->hd, cluster_offset + (s->cluster_sectors << 9)); + + cluster_offset >>= 9; + tmp = cpu_to_le32(cluster_offset); + l2_table[l2_index] = tmp; + // Save the active image state + activeBDRV.cluster_offset = cluster_offset; + activeBDRV.hd = bs; + } + /* First of all we write grain itself, to avoid race condition + * that may to corrupt the image. + * This problem may occur because of insufficient space on host disk + * or inappropriate VM shutdown. + */ + if (get_whole_cluster(bs, cluster_offset, offset, allocate) == -1) + return 0; + + if (m_data) { + m_data->offset = tmp; + m_data->l1_index = l1_index; + m_data->l2_index = l2_index; + m_data->l2_offset = l2_offset; + m_data->valid = 1; + } + } + 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, NULL, 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 index_in_cluster, n, ret; + uint64_t cluster_offset; + + while (nb_sectors > 0) { + cluster_offset = get_cluster_offset(bs, NULL, 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) { + // try to read from parent image, if exist + if (s->hd->backing_hd) { + if (!vmdk_is_cid_valid(bs)) + return -1; + ret = bdrv_read(s->hd->backing_hd, sector_num, buf, n); + if (ret < 0) + return -1; + } else { + memset(buf, 0, 512 * n); + } + } else { + if(bdrv_pread(s->hd, cluster_offset + index_in_cluster * 512, buf, n * 512) != 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; + VmdkMetaData m_data; + int index_in_cluster, n; + uint64_t cluster_offset; + static int cid_update = 0; + + if (sector_num > bs->total_sectors) { + fprintf(stderr, + "(VMDK) Wrong offset: sector_num=0x%" PRIx64 + " total_sectors=0x%" PRIx64 "\n", + sector_num, bs->total_sectors); + return -1; + } + + 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, &m_data, sector_num << 9, 1); + if (!cluster_offset) + return -1; + + if (bdrv_pwrite(s->hd, cluster_offset + index_in_cluster * 512, buf, n * 512) != n * 512) + return -1; + if (m_data.valid) { + /* update L2 tables */ + if (vmdk_L2update(bs, &m_data) == -1) + return -1; + } + nb_sectors -= n; + sector_num += n; + buf += n * 512; + + // update CID on the first write every time the virtual disk is opened + if (!cid_update) { + vmdk_write_cid(bs, time(NULL)); + cid_update++; + } + } + 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; + static const 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 = \"%d\"\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 */ + if (backing_file) { + return vmdk_snapshot_create(filename, 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; + snprintf(desc, sizeof(desc), desc_template, (unsigned int)time(NULL), + (unsigned long)total_size, real_filename, + (flags & BLOCK_FLAG_COMPAT6 ? 6 : 4), 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); + // try to close parent image, if exist + vmdk_parent_close(s->hd); + bdrv_delete(s->hd); +} + +static void vmdk_flush(BlockDriverState *bs) +{ + BDRVVmdkState *s = bs->opaque; + bdrv_flush(s->hd); +} + +BlockDriver bdrv_vmdk = { + "vmdk", + sizeof(BDRVVmdkState), + vmdk_probe, + vmdk_open, + vmdk_read, + vmdk_write, + vmdk_close, + vmdk_create, + vmdk_flush, + vmdk_is_allocated, +}; |