VMDK: create different subformats
Add create option 'format', with enums:
monolithicSparse
monolithicFlat
twoGbMaxExtentSparse
twoGbMaxExtentFlat
Each creates a subformat image file. The default is monolithicSparse.
Signed-off-by: Fam Zheng <famcool@gmail.com>
Reviewed-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Fam Zheng
Kevin Wolf
parent
7fa60fa377
commit
f66fd6c383
501
block/vmdk.c
501
block/vmdk.c
@ -156,8 +156,9 @@ static int vmdk_probe(const uint8_t *buf, int buf_size, const char *filename)
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#define CHECK_CID 1
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#define SECTOR_SIZE 512
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#define DESC_SIZE 20*SECTOR_SIZE // 20 sectors of 512 bytes each
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#define HEADER_SIZE 512 // first sector of 512 bytes
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#define DESC_SIZE (20 * SECTOR_SIZE) /* 20 sectors of 512 bytes each */
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#define BUF_SIZE 4096
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#define HEADER_SIZE 512 /* first sector of 512 bytes */
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static void vmdk_free_extents(BlockDriverState *bs)
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{
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@ -243,168 +244,6 @@ static int vmdk_is_cid_valid(BlockDriverState *bs)
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return 1;
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}
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static int vmdk_snapshot_create(const char *filename, const char *backing_file)
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{
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int snp_fd, p_fd;
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int ret;
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uint32_t p_cid;
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char *p_name, *gd_buf, *rgd_buf;
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const char *real_filename, *temp_str;
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VMDK4Header header;
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uint32_t gde_entries, gd_size;
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int64_t gd_offset, rgd_offset, capacity, gt_size;
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char p_desc[DESC_SIZE], s_desc[DESC_SIZE], hdr[HEADER_SIZE];
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static const char desc_template[] =
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"# Disk DescriptorFile\n"
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"version=1\n"
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"CID=%x\n"
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"parentCID=%x\n"
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"createType=\"monolithicSparse\"\n"
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"parentFileNameHint=\"%s\"\n"
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"\n"
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"# Extent description\n"
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"RW %u SPARSE \"%s\"\n"
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"\n"
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"# The Disk Data Base \n"
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"#DDB\n"
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"\n";
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snp_fd = open(filename, O_RDWR | O_CREAT | O_TRUNC | O_BINARY | O_LARGEFILE, 0644);
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if (snp_fd < 0)
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return -errno;
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p_fd = open(backing_file, O_RDONLY | O_BINARY | O_LARGEFILE);
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if (p_fd < 0) {
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close(snp_fd);
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return -errno;
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}
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/* read the header */
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if (lseek(p_fd, 0x0, SEEK_SET) == -1) {
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ret = -errno;
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goto fail;
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}
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if (read(p_fd, hdr, HEADER_SIZE) != HEADER_SIZE) {
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ret = -errno;
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goto fail;
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}
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/* write the header */
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if (lseek(snp_fd, 0x0, SEEK_SET) == -1) {
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ret = -errno;
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goto fail;
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}
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if (write(snp_fd, hdr, HEADER_SIZE) == -1) {
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ret = -errno;
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goto fail;
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}
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memset(&header, 0, sizeof(header));
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memcpy(&header,&hdr[4], sizeof(header)); // skip the VMDK4_MAGIC
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if (ftruncate(snp_fd, header.grain_offset << 9)) {
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ret = -errno;
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goto fail;
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}
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/* the descriptor offset = 0x200 */
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if (lseek(p_fd, 0x200, SEEK_SET) == -1) {
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ret = -errno;
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goto fail;
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}
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if (read(p_fd, p_desc, DESC_SIZE) != DESC_SIZE) {
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ret = -errno;
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goto fail;
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}
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if ((p_name = strstr(p_desc,"CID")) != NULL) {
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p_name += sizeof("CID");
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sscanf(p_name,"%x",&p_cid);
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}
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real_filename = filename;
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if ((temp_str = strrchr(real_filename, '\\')) != NULL)
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real_filename = temp_str + 1;
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if ((temp_str = strrchr(real_filename, '/')) != NULL)
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real_filename = temp_str + 1;
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if ((temp_str = strrchr(real_filename, ':')) != NULL)
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real_filename = temp_str + 1;
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snprintf(s_desc, sizeof(s_desc), desc_template, p_cid, p_cid, backing_file,
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(uint32_t)header.capacity, real_filename);
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/* write the descriptor */
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if (lseek(snp_fd, 0x200, SEEK_SET) == -1) {
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ret = -errno;
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goto fail;
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}
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if (write(snp_fd, s_desc, strlen(s_desc)) == -1) {
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ret = -errno;
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goto fail;
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}
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gd_offset = header.gd_offset * SECTOR_SIZE; // offset of GD table
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rgd_offset = header.rgd_offset * SECTOR_SIZE; // offset of RGD table
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capacity = header.capacity * SECTOR_SIZE; // Extent size
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/*
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* Each GDE span 32M disk, means:
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* 512 GTE per GT, each GTE points to grain
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*/
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gt_size = (int64_t)header.num_gtes_per_gte * header.granularity * SECTOR_SIZE;
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if (!gt_size) {
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ret = -EINVAL;
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goto fail;
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}
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gde_entries = (uint32_t)(capacity / gt_size); // number of gde/rgde
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gd_size = gde_entries * sizeof(uint32_t);
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/* write RGD */
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rgd_buf = qemu_malloc(gd_size);
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if (lseek(p_fd, rgd_offset, SEEK_SET) == -1) {
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ret = -errno;
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goto fail_rgd;
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}
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if (read(p_fd, rgd_buf, gd_size) != gd_size) {
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ret = -errno;
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goto fail_rgd;
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}
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if (lseek(snp_fd, rgd_offset, SEEK_SET) == -1) {
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ret = -errno;
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goto fail_rgd;
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}
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if (write(snp_fd, rgd_buf, gd_size) == -1) {
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ret = -errno;
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goto fail_rgd;
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}
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/* write GD */
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gd_buf = qemu_malloc(gd_size);
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if (lseek(p_fd, gd_offset, SEEK_SET) == -1) {
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ret = -errno;
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goto fail_gd;
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}
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if (read(p_fd, gd_buf, gd_size) != gd_size) {
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ret = -errno;
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goto fail_gd;
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}
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if (lseek(snp_fd, gd_offset, SEEK_SET) == -1) {
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ret = -errno;
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goto fail_gd;
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}
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if (write(snp_fd, gd_buf, gd_size) == -1) {
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ret = -errno;
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goto fail_gd;
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}
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ret = 0;
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fail_gd:
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qemu_free(gd_buf);
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fail_rgd:
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qemu_free(rgd_buf);
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fail:
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close(p_fd);
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close(snp_fd);
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return ret;
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}
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static int vmdk_parent_open(BlockDriverState *bs)
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{
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char *p_name;
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@ -1058,68 +897,40 @@ static int vmdk_write(BlockDriverState *bs, int64_t sector_num,
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return 0;
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}
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static int vmdk_create(const char *filename, QEMUOptionParameter *options)
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static int vmdk_create_extent(const char *filename, int64_t filesize, bool flat)
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{
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int fd, i;
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int ret, i;
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int fd = 0;
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VMDK4Header header;
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uint32_t tmp, magic, grains, gd_size, gt_size, gt_count;
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static const char desc_template[] =
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"# Disk DescriptorFile\n"
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"version=1\n"
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"CID=%x\n"
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"parentCID=ffffffff\n"
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"createType=\"monolithicSparse\"\n"
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"\n"
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"# Extent description\n"
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"RW %" PRId64 " SPARSE \"%s\"\n"
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"\n"
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"# The Disk Data Base \n"
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"#DDB\n"
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"\n"
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"ddb.virtualHWVersion = \"%d\"\n"
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"ddb.geometry.cylinders = \"%" PRId64 "\"\n"
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"ddb.geometry.heads = \"16\"\n"
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"ddb.geometry.sectors = \"63\"\n"
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"ddb.adapterType = \"ide\"\n";
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char desc[1024];
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const char *real_filename, *temp_str;
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int64_t total_size = 0;
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const char *backing_file = NULL;
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int flags = 0;
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int ret;
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// Read out options
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while (options && options->name) {
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if (!strcmp(options->name, BLOCK_OPT_SIZE)) {
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total_size = options->value.n / 512;
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} else if (!strcmp(options->name, BLOCK_OPT_BACKING_FILE)) {
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backing_file = options->value.s;
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} else if (!strcmp(options->name, BLOCK_OPT_COMPAT6)) {
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flags |= options->value.n ? BLOCK_FLAG_COMPAT6: 0;
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}
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options++;
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}
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/* XXX: add support for backing file */
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if (backing_file) {
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return vmdk_snapshot_create(filename, backing_file);
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}
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fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY | O_LARGEFILE,
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fd = open(
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filename,
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O_WRONLY | O_CREAT | O_TRUNC | O_BINARY | O_LARGEFILE,
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0644);
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if (fd < 0)
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if (fd < 0) {
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return -errno;
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}
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if (flat) {
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ret = ftruncate(fd, filesize);
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if (ret < 0) {
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ret = -errno;
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}
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goto exit;
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}
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magic = cpu_to_be32(VMDK4_MAGIC);
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memset(&header, 0, sizeof(header));
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header.version = 1;
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header.flags = 3; /* ?? */
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header.capacity = total_size;
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header.capacity = filesize / 512;
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header.granularity = 128;
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header.num_gtes_per_gte = 512;
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grains = (total_size + header.granularity - 1) / header.granularity;
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grains = (filesize / 512 + header.granularity - 1) / header.granularity;
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gt_size = ((header.num_gtes_per_gte * sizeof(uint32_t)) + 511) >> 9;
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gt_count = (grains + header.num_gtes_per_gte - 1) / header.num_gtes_per_gte;
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gt_count =
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(grains + header.num_gtes_per_gte - 1) / header.num_gtes_per_gte;
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gd_size = (gt_count * sizeof(uint32_t) + 511) >> 9;
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header.desc_offset = 1;
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@ -1130,7 +941,6 @@ static int vmdk_create(const char *filename, QEMUOptionParameter *options)
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((header.gd_offset + gd_size + (gt_size * gt_count) +
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header.granularity - 1) / header.granularity) *
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header.granularity;
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/* swap endianness for all header fields */
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header.version = cpu_to_le32(header.version);
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header.flags = cpu_to_le32(header.flags);
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@ -1188,27 +998,255 @@ static int vmdk_create(const char *filename, QEMUOptionParameter *options)
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}
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}
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/* compose the descriptor */
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real_filename = filename;
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if ((temp_str = strrchr(real_filename, '\\')) != NULL)
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real_filename = temp_str + 1;
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if ((temp_str = strrchr(real_filename, '/')) != NULL)
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real_filename = temp_str + 1;
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if ((temp_str = strrchr(real_filename, ':')) != NULL)
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real_filename = temp_str + 1;
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snprintf(desc, sizeof(desc), desc_template, (unsigned int)time(NULL),
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total_size, real_filename,
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(flags & BLOCK_FLAG_COMPAT6 ? 6 : 4),
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total_size / (int64_t)(63 * 16));
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ret = 0;
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exit:
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close(fd);
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return ret;
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}
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/* write the descriptor */
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lseek(fd, le64_to_cpu(header.desc_offset) << 9, SEEK_SET);
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static int filename_decompose(const char *filename, char *path, char *prefix,
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char *postfix, size_t buf_len)
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{
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const char *p, *q;
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if (filename == NULL || !strlen(filename)) {
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fprintf(stderr, "Vmdk: no filename provided.\n");
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return -1;
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}
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p = strrchr(filename, '/');
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if (p == NULL) {
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p = strrchr(filename, '\\');
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}
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if (p == NULL) {
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p = strrchr(filename, ':');
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}
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if (p != NULL) {
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p++;
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if (p - filename >= buf_len) {
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return -1;
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}
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pstrcpy(path, p - filename + 1, filename);
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} else {
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p = filename;
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path[0] = '\0';
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}
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q = strrchr(p, '.');
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if (q == NULL) {
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pstrcpy(prefix, buf_len, p);
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postfix[0] = '\0';
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} else {
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if (q - p >= buf_len) {
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return -1;
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}
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pstrcpy(prefix, q - p + 1, p);
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pstrcpy(postfix, buf_len, q);
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}
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return 0;
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}
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static int relative_path(char *dest, int dest_size,
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const char *base, const char *target)
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{
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int i = 0;
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int n = 0;
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const char *p, *q;
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#ifdef _WIN32
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const char *sep = "\\";
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#else
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const char *sep = "/";
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#endif
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if (!(dest && base && target)) {
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return -1;
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}
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if (path_is_absolute(target)) {
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dest[dest_size - 1] = '\0';
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strncpy(dest, target, dest_size - 1);
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return 0;
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}
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while (base[i] == target[i]) {
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i++;
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}
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p = &base[i];
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q = &target[i];
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while (*p) {
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if (*p == *sep) {
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n++;
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}
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p++;
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}
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dest[0] = '\0';
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for (; n; n--) {
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pstrcat(dest, dest_size, "..");
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pstrcat(dest, dest_size, sep);
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}
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pstrcat(dest, dest_size, q);
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return 0;
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}
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static int vmdk_create(const char *filename, QEMUOptionParameter *options)
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{
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int fd, idx = 0;
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char desc[BUF_SIZE];
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int64_t total_size = 0, filesize;
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const char *backing_file = NULL;
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const char *fmt = NULL;
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int flags = 0;
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int ret = 0;
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bool flat, split;
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char ext_desc_lines[BUF_SIZE] = "";
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char path[PATH_MAX], prefix[PATH_MAX], postfix[PATH_MAX];
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const int64_t split_size = 0x80000000; /* VMDK has constant split size */
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const char *desc_extent_line;
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char parent_desc_line[BUF_SIZE] = "";
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uint32_t parent_cid = 0xffffffff;
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const char desc_template[] =
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"# Disk DescriptorFile\n"
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"version=1\n"
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"CID=%x\n"
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"parentCID=%x\n"
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"createType=\"%s\"\n"
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"%s"
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"\n"
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"# Extent description\n"
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"%s"
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"\n"
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"# The Disk Data Base\n"
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"#DDB\n"
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"\n"
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"ddb.virtualHWVersion = \"%d\"\n"
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"ddb.geometry.cylinders = \"%" PRId64 "\"\n"
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"ddb.geometry.heads = \"16\"\n"
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"ddb.geometry.sectors = \"63\"\n"
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"ddb.adapterType = \"ide\"\n";
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if (filename_decompose(filename, path, prefix, postfix, PATH_MAX)) {
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return -EINVAL;
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}
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/* Read out options */
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while (options && options->name) {
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if (!strcmp(options->name, BLOCK_OPT_SIZE)) {
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total_size = options->value.n;
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} else if (!strcmp(options->name, BLOCK_OPT_BACKING_FILE)) {
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backing_file = options->value.s;
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} else if (!strcmp(options->name, BLOCK_OPT_COMPAT6)) {
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flags |= options->value.n ? BLOCK_FLAG_COMPAT6 : 0;
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} else if (!strcmp(options->name, BLOCK_OPT_SUBFMT)) {
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fmt = options->value.s;
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}
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options++;
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}
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if (!fmt) {
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/* Default format to monolithicSparse */
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fmt = "monolithicSparse";
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} else if (strcmp(fmt, "monolithicFlat") &&
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strcmp(fmt, "monolithicSparse") &&
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strcmp(fmt, "twoGbMaxExtentSparse") &&
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strcmp(fmt, "twoGbMaxExtentFlat")) {
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fprintf(stderr, "VMDK: Unknown subformat: %s\n", fmt);
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return -EINVAL;
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}
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split = !(strcmp(fmt, "twoGbMaxExtentFlat") &&
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strcmp(fmt, "twoGbMaxExtentSparse"));
|
||||
flat = !(strcmp(fmt, "monolithicFlat") &&
|
||||
strcmp(fmt, "twoGbMaxExtentFlat"));
|
||||
if (flat) {
|
||||
desc_extent_line = "RW %lld FLAT \"%s\" 0\n";
|
||||
} else {
|
||||
desc_extent_line = "RW %lld SPARSE \"%s\"\n";
|
||||
}
|
||||
if (flat && backing_file) {
|
||||
/* not supporting backing file for flat image */
|
||||
return -ENOTSUP;
|
||||
}
|
||||
if (backing_file) {
|
||||
char parent_filename[PATH_MAX];
|
||||
BlockDriverState *bs = bdrv_new("");
|
||||
ret = bdrv_open(bs, backing_file, 0, NULL);
|
||||
if (ret != 0) {
|
||||
bdrv_delete(bs);
|
||||
return ret;
|
||||
}
|
||||
if (strcmp(bs->drv->format_name, "vmdk")) {
|
||||
bdrv_delete(bs);
|
||||
return -EINVAL;
|
||||
}
|
||||
filesize = bdrv_getlength(bs);
|
||||
parent_cid = vmdk_read_cid(bs, 0);
|
||||
bdrv_delete(bs);
|
||||
relative_path(parent_filename, sizeof(parent_filename),
|
||||
filename, backing_file);
|
||||
snprintf(parent_desc_line, sizeof(parent_desc_line),
|
||||
"parentFileNameHint=\"%s\"", parent_filename);
|
||||
}
|
||||
|
||||
/* Create extents */
|
||||
filesize = total_size;
|
||||
while (filesize > 0) {
|
||||
char desc_line[BUF_SIZE];
|
||||
char ext_filename[PATH_MAX];
|
||||
char desc_filename[PATH_MAX];
|
||||
int64_t size = filesize;
|
||||
|
||||
if (split && size > split_size) {
|
||||
size = split_size;
|
||||
}
|
||||
if (split) {
|
||||
snprintf(desc_filename, sizeof(desc_filename), "%s-%c%03d%s",
|
||||
prefix, flat ? 'f' : 's', ++idx, postfix);
|
||||
} else if (flat) {
|
||||
snprintf(desc_filename, sizeof(desc_filename), "%s-flat%s",
|
||||
prefix, postfix);
|
||||
} else {
|
||||
snprintf(desc_filename, sizeof(desc_filename), "%s%s",
|
||||
prefix, postfix);
|
||||
}
|
||||
snprintf(ext_filename, sizeof(ext_filename), "%s%s",
|
||||
path, desc_filename);
|
||||
|
||||
if (vmdk_create_extent(ext_filename, size, flat)) {
|
||||
return -EINVAL;
|
||||
}
|
||||
filesize -= size;
|
||||
|
||||
/* Format description line */
|
||||
snprintf(desc_line, sizeof(desc_line),
|
||||
desc_extent_line, size / 512, desc_filename);
|
||||
pstrcat(ext_desc_lines, sizeof(ext_desc_lines), desc_line);
|
||||
}
|
||||
/* generate descriptor file */
|
||||
snprintf(desc, sizeof(desc), desc_template,
|
||||
(unsigned int)time(NULL),
|
||||
parent_cid,
|
||||
fmt,
|
||||
parent_desc_line,
|
||||
ext_desc_lines,
|
||||
(flags & BLOCK_FLAG_COMPAT6 ? 6 : 4),
|
||||
total_size / (int64_t)(63 * 16 * 512));
|
||||
if (split || flat) {
|
||||
fd = open(
|
||||
filename,
|
||||
O_WRONLY | O_CREAT | O_TRUNC | O_BINARY | O_LARGEFILE,
|
||||
0644);
|
||||
} else {
|
||||
fd = open(
|
||||
filename,
|
||||
O_WRONLY | O_BINARY | O_LARGEFILE,
|
||||
0644);
|
||||
}
|
||||
if (fd < 0) {
|
||||
return -errno;
|
||||
}
|
||||
/* the descriptor offset = 0x200 */
|
||||
if (!split && !flat && 0x200 != lseek(fd, 0x200, SEEK_SET)) {
|
||||
ret = -errno;
|
||||
goto exit;
|
||||
}
|
||||
ret = qemu_write_full(fd, desc, strlen(desc));
|
||||
if (ret != strlen(desc)) {
|
||||
ret = -errno;
|
||||
goto exit;
|
||||
}
|
||||
|
||||
ret = 0;
|
||||
exit:
|
||||
close(fd);
|
||||
@ -1252,6 +1290,13 @@ static QEMUOptionParameter vmdk_create_options[] = {
|
||||
.type = OPT_FLAG,
|
||||
.help = "VMDK version 6 image"
|
||||
},
|
||||
{
|
||||
.name = BLOCK_OPT_SUBFMT,
|
||||
.type = OPT_STRING,
|
||||
.help =
|
||||
"VMDK flat extent format, can be one of "
|
||||
"{monolithicSparse (default) | monolithicFlat | twoGbMaxExtentSparse | twoGbMaxExtentFlat} "
|
||||
},
|
||||
{ NULL }
|
||||
};
|
||||
|
||||
|
||||
@ -39,6 +39,7 @@
|
||||
#define BLOCK_OPT_CLUSTER_SIZE "cluster_size"
|
||||
#define BLOCK_OPT_TABLE_SIZE "table_size"
|
||||
#define BLOCK_OPT_PREALLOC "preallocation"
|
||||
#define BLOCK_OPT_SUBFMT "subformat"
|
||||
|
||||
typedef struct AIOPool {
|
||||
void (*cancel)(BlockDriverAIOCB *acb);
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user