+++ /dev/null
-/*
- * 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)) != NULL) {
- 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")) != NULL) {
- 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")) != NULL) {
- 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")) != NULL) {
- char *end_name;
- struct stat file_buf;
-
- p_name += sizeof("parentFileNameHint") + 1;
- if ((end_name = strchr(p_name,'\"')) == NULL)
- return -1;
- if ((end_name - p_name) > sizeof (s->hd->backing_file) - 1)
- return -1;
-
- pstrcpy(s->hd->backing_file, end_name - p_name + 1, 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 (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 (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 %" 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 = {
- .format_name = "vmdk",
- .instance_size = sizeof(BDRVVmdkState),
- .bdrv_probe = vmdk_probe,
- .bdrv_open = vmdk_open,
- .bdrv_read = vmdk_read,
- .bdrv_write = vmdk_write,
- .bdrv_close = vmdk_close,
- .bdrv_create = vmdk_create,
- .bdrv_flush = vmdk_flush,
- .bdrv_is_allocated = vmdk_is_allocated,
-};
projects / qemu / blobdiff