| /* |
| * 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 = bs->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 (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 (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); |
| } |
| |
| static 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 (bs->backing_file) - 1) |
| return -1; |
| |
| pstrcpy(bs->backing_file, end_name - p_name + 1, p_name); |
| if (stat(bs->backing_file, &file_buf) != 0) { |
| path_combine(parent_img_name, sizeof(parent_img_name), |
| filename, bs->backing_file); |
| } else { |
| pstrcpy(parent_img_name, sizeof(parent_img_name), |
| bs->backing_file); |
| } |
| |
| bs->backing_hd = bdrv_new(""); |
| if (!bs->backing_hd) { |
| failure: |
| bdrv_close(s->hd); |
| return -1; |
| } |
| parent_open = 1; |
| if (bdrv_open(bs->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 (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 (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)); |
| 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 (bs->backing_hd) { |
| BDRVVmdkState *ps = bs->backing_hd->opaque; |
| |
| if (!vmdk_is_cid_valid(bs)) |
| return -1; |
| |
| parent_cluster_offset = get_cluster_offset(bs->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 (bs->backing_hd) { |
| if (!vmdk_is_cid_valid(bs)) |
| return -1; |
| ret = bdrv_read(bs->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 %" PRId64 " SPARSE \"%s\"\n" |
| "\n" |
| "# The Disk Data Base \n" |
| "#DDB\n" |
| "\n" |
| "ddb.virtualHWVersion = \"%d\"\n" |
| "ddb.geometry.cylinders = \"%" PRId64 "\"\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), |
| total_size, real_filename, |
| (flags & BLOCK_FLAG_COMPAT6 ? 6 : 4), |
| total_size / (int64_t)(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, |
| }; |
