/*
* 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
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
-#include "vl.h"
-#include "block_int.h"
-/* XXX: this code is untested */
-/* XXX: add write support */
+#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')
int64_t grain_offset;
char filler[1];
char check_bytes[4];
-} VMDK4Header;
+} __attribute__((packed)) VMDK4Header;
#define L2_CACHE_SIZE 16
typedef struct BDRVVmdkState {
- int fd;
+ 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;
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;
return 0;
}
-static int vmdk_open(BlockDriverState *bs, const char *filename)
+#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;
- int fd, i;
- uint32_t magic;
- int l1_size;
+ char desc[DESC_SIZE];
+ uint32_t cid;
+ const char *p_name, *cid_str;
+ size_t cid_str_size;
- fd = open(filename, O_RDONLY | O_BINARY | O_LARGEFILE);
- if (fd < 0)
+ /* 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 (read(fd, &magic, sizeof(magic)) != sizeof(magic))
+
+ 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 (read(fd, &header, sizeof(header)) !=
- sizeof(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) * 512;
+ 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))
+
+ if (bdrv_pread(s->hd, sizeof(magic), &header, sizeof(header)) != sizeof(header))
goto fail;
- bs->total_sectors = le32_to_cpu(header.capacity);
- s->cluster_sectors = le32_to_cpu(header.granularity);
+ 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_size = (bs->total_sectors + s->l1_entry_sectors - 1)
/ s->l1_entry_sectors;
- s->l1_table_offset = le64_to_cpu(header.rgd_offset) * 512;
+ 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 (lseek(fd, s->l1_table_offset, SEEK_SET) == -1)
- goto fail;
- if (read(fd, s->l1_table, l1_size) != 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));
- if (!s->l2_cache)
- goto fail;
- s->fd = fd;
- /* XXX: currently only read only */
- bs->read_only = 1;
return 0;
fail:
+ qemu_free(s->l1_backup_table);
qemu_free(s->l1_table);
qemu_free(s->l2_cache);
- close(fd);
+ bdrv_delete(s->hd);
return -1;
}
-static uint64_t get_cluster_offset(BlockDriverState *bs,
- uint64_t offset)
+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;
+ 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 */
}
}
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))
+ 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,
+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);
+ 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)
return (cluster_offset != 0);
}
-static int vmdk_read(BlockDriverState *bs, int64_t sector_num,
+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;
+ int index_in_cluster, n, ret;
uint64_t cluster_offset;
-
+
while (nb_sectors > 0) {
- cluster_offset = get_cluster_offset(bs, sector_num << 9);
+ 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) {
- memset(buf, 0, 512 * n);
+ // 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 {
- lseek(s->fd, cluster_offset + index_in_cluster * 512, SEEK_SET);
- ret = read(s->fd, buf, n * 512);
- if (ret != n * 512)
+ if(bdrv_pread(s->hd, cluster_offset + index_in_cluster * 512, buf, n * 512) != n * 512)
return -1;
}
nb_sectors -= n;
return 0;
}
-static int vmdk_write(BlockDriverState *bs, int64_t sector_num,
+static int vmdk_write(BlockDriverState *bs, int64_t sector_num,
const uint8_t *buf, int nb_sectors)
{
- return -1;
+ 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);
- close(s->fd);
+ // 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,
- NULL, /* no create yet */
- vmdk_is_allocated,
+ .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