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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 2011-07-19 08:45:23 +08:00 committed by Kevin Wolf
parent 7fa60fa377
commit f66fd6c383
2 changed files with 275 additions and 229 deletions
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503
block/vmdk.c
View File

@ -156,8 +156,9 @@ static int vmdk_probe(const uint8_t *buf, int buf_size, 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
#define DESC_SIZE (20 * SECTOR_SIZE) /* 20 sectors of 512 bytes each */
#define BUF_SIZE 4096
#define HEADER_SIZE 512 /* first sector of 512 bytes */
static void vmdk_free_extents(BlockDriverState *bs)
{
@ -243,168 +244,6 @@ static int vmdk_is_cid_valid(BlockDriverState *bs)
return 1;
}
static int vmdk_snapshot_create(const char *filename, const char *backing_file)
{
int snp_fd, p_fd;
int ret;
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 -errno;
p_fd = open(backing_file, O_RDONLY | O_BINARY | O_LARGEFILE);
if (p_fd < 0) {
close(snp_fd);
return -errno;
}
/* read the header */
if (lseek(p_fd, 0x0, SEEK_SET) == -1) {
ret = -errno;
goto fail;
}
if (read(p_fd, hdr, HEADER_SIZE) != HEADER_SIZE) {
ret = -errno;
goto fail;
}
/* write the header */
if (lseek(snp_fd, 0x0, SEEK_SET) == -1) {
ret = -errno;
goto fail;
}
if (write(snp_fd, hdr, HEADER_SIZE) == -1) {
ret = -errno;
goto fail;
}
memset(&header, 0, sizeof(header));
memcpy(&header,&hdr[4], sizeof(header)); // skip the VMDK4_MAGIC
if (ftruncate(snp_fd, header.grain_offset << 9)) {
ret = -errno;
goto fail;
}
/* the descriptor offset = 0x200 */
if (lseek(p_fd, 0x200, SEEK_SET) == -1) {
ret = -errno;
goto fail;
}
if (read(p_fd, p_desc, DESC_SIZE) != DESC_SIZE) {
ret = -errno;
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) {
ret = -errno;
goto fail;
}
if (write(snp_fd, s_desc, strlen(s_desc)) == -1) {
ret = -errno;
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) {
ret = -EINVAL;
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) {
ret = -errno;
goto fail_rgd;
}
if (read(p_fd, rgd_buf, gd_size) != gd_size) {
ret = -errno;
goto fail_rgd;
}
if (lseek(snp_fd, rgd_offset, SEEK_SET) == -1) {
ret = -errno;
goto fail_rgd;
}
if (write(snp_fd, rgd_buf, gd_size) == -1) {
ret = -errno;
goto fail_rgd;
}
/* write GD */
gd_buf = qemu_malloc(gd_size);
if (lseek(p_fd, gd_offset, SEEK_SET) == -1) {
ret = -errno;
goto fail_gd;
}
if (read(p_fd, gd_buf, gd_size) != gd_size) {
ret = -errno;
goto fail_gd;
}
if (lseek(snp_fd, gd_offset, SEEK_SET) == -1) {
ret = -errno;
goto fail_gd;
}
if (write(snp_fd, gd_buf, gd_size) == -1) {
ret = -errno;
goto fail_gd;
}
ret = 0;
fail_gd:
qemu_free(gd_buf);
fail_rgd:
qemu_free(rgd_buf);
fail:
close(p_fd);
close(snp_fd);
return ret;
}
static int vmdk_parent_open(BlockDriverState *bs)
{
char *p_name;
@ -1058,68 +897,40 @@ static int vmdk_write(BlockDriverState *bs, int64_t sector_num,
return 0;
}
static int vmdk_create(const char *filename, QEMUOptionParameter *options)
static int vmdk_create_extent(const char *filename, int64_t filesize, bool flat)
{
int fd, i;
int ret, i;
int fd = 0;
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;
int64_t total_size = 0;
const char *backing_file = NULL;
int flags = 0;
int ret;
// Read out options
while (options && options->name) {
if (!strcmp(options->name, BLOCK_OPT_SIZE)) {
total_size = options->value.n / 512;
} else if (!strcmp(options->name, BLOCK_OPT_BACKING_FILE)) {
backing_file = options->value.s;
} else if (!strcmp(options->name, BLOCK_OPT_COMPAT6)) {
flags |= options->value.n ? BLOCK_FLAG_COMPAT6: 0;
}
options++;
}
/* 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)
fd = open(
filename,
O_WRONLY | O_CREAT | O_TRUNC | O_BINARY | O_LARGEFILE,
0644);
if (fd < 0) {
return -errno;
}
if (flat) {
ret = ftruncate(fd, filesize);
if (ret < 0) {
ret = -errno;
}
goto exit;
}
magic = cpu_to_be32(VMDK4_MAGIC);
memset(&header, 0, sizeof(header));
header.version = 1;
header.flags = 3; /* ?? */
header.capacity = total_size;
header.capacity = filesize / 512;
header.granularity = 128;
header.num_gtes_per_gte = 512;
grains = (total_size + header.granularity - 1) / header.granularity;
grains = (filesize / 512 + 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;
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;
@ -1130,7 +941,6 @@ static int vmdk_create(const char *filename, QEMUOptionParameter *options)
((header.gd_offset + gd_size + (gt_size * gt_count) +
header.granularity - 1) / header.granularity) *
header.granularity;
/* swap endianness for all header fields */
header.version = cpu_to_le32(header.version);
header.flags = cpu_to_le32(header.flags);
@ -1188,27 +998,255 @@ static int vmdk_create(const char *filename, QEMUOptionParameter *options)
}
}
/* 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));
ret = 0;
exit:
close(fd);
return ret;
}
/* write the descriptor */
lseek(fd, le64_to_cpu(header.desc_offset) << 9, SEEK_SET);
static int filename_decompose(const char *filename, char *path, char *prefix,
char *postfix, size_t buf_len)
{
const char *p, *q;
if (filename == NULL || !strlen(filename)) {
fprintf(stderr, "Vmdk: no filename provided.\n");
return -1;
}
p = strrchr(filename, '/');
if (p == NULL) {
p = strrchr(filename, '\\');
}
if (p == NULL) {
p = strrchr(filename, ':');
}
if (p != NULL) {
p++;
if (p - filename >= buf_len) {
return -1;
}
pstrcpy(path, p - filename + 1, filename);
} else {
p = filename;
path[0] = '\0';
}
q = strrchr(p, '.');
if (q == NULL) {
pstrcpy(prefix, buf_len, p);
postfix[0] = '\0';
} else {
if (q - p >= buf_len) {
return -1;
}
pstrcpy(prefix, q - p + 1, p);
pstrcpy(postfix, buf_len, q);
}
return 0;
}
static int relative_path(char *dest, int dest_size,
const char *base, const char *target)
{
int i = 0;
int n = 0;
const char *p, *q;
#ifdef _WIN32
const char *sep = "\\";
#else
const char *sep = "/";
#endif
if (!(dest && base && target)) {
return -1;
}
if (path_is_absolute(target)) {
dest[dest_size - 1] = '\0';
strncpy(dest, target, dest_size - 1);
return 0;
}
while (base[i] == target[i]) {
i++;
}
p = &base[i];
q = &target[i];
while (*p) {
if (*p == *sep) {
n++;
}
p++;
}
dest[0] = '\0';
for (; n; n--) {
pstrcat(dest, dest_size, "..");
pstrcat(dest, dest_size, sep);
}
pstrcat(dest, dest_size, q);
return 0;
}
static int vmdk_create(const char *filename, QEMUOptionParameter *options)
{
int fd, idx = 0;
char desc[BUF_SIZE];
int64_t total_size = 0, filesize;
const char *backing_file = NULL;
const char *fmt = NULL;
int flags = 0;
int ret = 0;
bool flat, split;
char ext_desc_lines[BUF_SIZE] = "";
char path[PATH_MAX], prefix[PATH_MAX], postfix[PATH_MAX];
const int64_t split_size = 0x80000000; /* VMDK has constant split size */
const char *desc_extent_line;
char parent_desc_line[BUF_SIZE] = "";
uint32_t parent_cid = 0xffffffff;
const char desc_template[] =
"# Disk DescriptorFile\n"
"version=1\n"
"CID=%x\n"
"parentCID=%x\n"
"createType=\"%s\"\n"
"%s"
"\n"
"# Extent description\n"
"%s"
"\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";
if (filename_decompose(filename, path, prefix, postfix, PATH_MAX)) {
return -EINVAL;
}
/* Read out options */
while (options && options->name) {
if (!strcmp(options->name, BLOCK_OPT_SIZE)) {
total_size = options->value.n;
} else if (!strcmp(options->name, BLOCK_OPT_BACKING_FILE)) {
backing_file = options->value.s;
} else if (!strcmp(options->name, BLOCK_OPT_COMPAT6)) {
flags |= options->value.n ? BLOCK_FLAG_COMPAT6 : 0;
} else if (!strcmp(options->name, BLOCK_OPT_SUBFMT)) {
fmt = options->value.s;
}
options++;
}
if (!fmt) {
/* Default format to monolithicSparse */
fmt = "monolithicSparse";
} else if (strcmp(fmt, "monolithicFlat") &&
strcmp(fmt, "monolithicSparse") &&
strcmp(fmt, "twoGbMaxExtentSparse") &&
strcmp(fmt, "twoGbMaxExtentFlat")) {
fprintf(stderr, "VMDK: Unknown subformat: %s\n", fmt);
return -EINVAL;
}
split = !(strcmp(fmt, "twoGbMaxExtentFlat") &&
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 }
};

1
block_int.h
View File

@ -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);