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https://gitlab.com/qemu-project/qemu
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VMware 4 disk images support
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@927 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
bellard
parent
dbda808a4a
commit
05efe46eaa
3 changed files with 169 additions and 62 deletions
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@ -574,6 +574,14 @@ Since holes are used, the displayed size of the COW disk image is not
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the real one. To know it, use the @code{ls -ls} command.
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@end enumerate
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@subsection Convert VMware disk images to raw disk images
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You can use the tool @file{vmdk2raw} to convert VMware disk images to
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raw disk images directly usable by QEMU. The syntax is:
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@example
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vmdk2raw vmware_image output_image
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@end example
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@section Network emulation
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QEMU simulates up to 6 networks cards (NE2000 boards). Each card can
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24
vmdk.h
24
vmdk.h
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@ -32,12 +32,11 @@
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struct cowdisk_header
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{
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char magic[4]; /* COWD */
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uint32_t version;
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uint32_t flags;
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uint32_t disk_sectors;
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uint32_t granularity;
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uint32_t l1dir_sector;
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uint32_t l1dir_offset;
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uint32_t l1dir_size;
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uint32_t file_sectors;
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uint32_t cylinders;
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@ -50,3 +49,24 @@ struct cowdisk_header2
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uint32_t parent_ts;
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uint32_t timestamp;
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};
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/* based on vdk 3.1 10-11-2003 by Ken Kato */
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struct vmdisk_header
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{
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uint32_t version;
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uint32_t flags;
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int64_t capacity;
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int64_t granularity;
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int64_t desc_offset;
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int64_t desc_size;
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int32_t num_gtes_per_gte;
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int64_t rgd_offset;
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int64_t gd_offset;
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int64_t grain_offset;
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char filler[1];
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char check_bytes[4];
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};
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199
vmdk2raw.c
199
vmdk2raw.c
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@ -30,131 +30,210 @@
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#include "vmdk.h"
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#include "config-host.h"
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struct cowdisk_header header;
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struct cowdisk_header2 header2;
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off_t disk_base, disk_limit;
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unsigned int granule_size;
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uint32_t l1dir[L1_SIZE];
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static struct cowdisk_header header;
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static struct vmdisk_header header4;
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static off64_t disk_limit;
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static unsigned int granule_size;
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static uint32_t *l1dir;
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unsigned int cached_l2dir;
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uint32_t l2dir[L2_SIZE];
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static unsigned int cached_l2dir;
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static uint32_t l2dir[L2_SIZE];
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size_t read_physical(int fd, off64_t offset, size_t length, void *buffer)
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static struct vmdk_prm {
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uint32_t grain_table_size;
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uint32_t sectors_per_grain;
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uint32_t sectors_per_table;
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uint32_t directory_size;
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} vdsk;
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static size_t read_physical(int fd, off64_t offset, size_t length, void *buffer)
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{
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size_t n;
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if (lseek64(fd, offset, SEEK_SET) == -1)
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{
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perror("lseek");
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if (lseek64(fd, offset, SEEK_SET) == -1) {
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printf(" error trying to seek lseek to %lld", offset);
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return -1;
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}
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n = read(fd, buffer, length);
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if (n == -1)
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{
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perror("read from disk");
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if (n == -1) {
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printf("read from disk %lld", offset);
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return -1;
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}
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return n;
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}
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size_t copy_virtual(int in_fd, int out_fd, off64_t offset, void *buffer, size_t length)
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static int read_l1dir(int fd, size_t offset, int num)
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{
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unsigned int granule_index, granule_offset;
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unsigned int l1index, l2index;
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l1dir = malloc(sizeof(*l1dir) * num);
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if (!l1dir)
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return -1;
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return read_physical(fd, offset << SECTOR_BITS, sizeof(*l1dir) * num, (char *)l1dir) != (sizeof(*l1dir) * num);
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}
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granule_index = offset / granule_size;
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static int read_l2dir(int fd, size_t offset, int num)
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{
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return read_physical(fd, offset << SECTOR_BITS, sizeof(l2dir[0]) * num, (char *)l2dir) != sizeof(l2dir);
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}
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static size_t copy_virtual(struct vmdk_prm *dsk, int in_fd, int out_fd, off64_t offset, void *buffer, size_t length)
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{
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unsigned int granule_offset;
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unsigned int grain_index;
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unsigned int sector_map_idx;
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granule_offset = offset % granule_size;
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length = MIN(length, granule_size - granule_offset);
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length = MIN(length, disk_limit - offset);
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l1index = (granule_index >> L2_BITS) & L1_MASK;
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l2index = granule_index & L2_MASK;
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if (l1dir[l1index] == 0)
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goto zero_fill;
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if (l1index != cached_l2dir)
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{
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if (read_physical(in_fd, (l1dir[l1index] << SECTOR_BITS), sizeof(l2dir), (char *)l2dir) != sizeof(l2dir))
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return 0;
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cached_l2dir = l1index;
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sector_map_idx = (offset >> SECTOR_BITS) / dsk->sectors_per_table;
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if (sector_map_idx >= dsk->directory_size) {
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fprintf(stderr, "cannot locate grain table for %d in %d\n", sector_map_idx, dsk->directory_size);
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return -1;
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}
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if (l2dir[l2index] == 0)
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if (l1dir[sector_map_idx] == 0)
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goto zero_fill;
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if (sector_map_idx != cached_l2dir) {
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if (read_l2dir(in_fd, l1dir[sector_map_idx], dsk->grain_table_size)) {
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fprintf(stderr, "read failed\n");
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return -1;
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}
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cached_l2dir = sector_map_idx;
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}
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grain_index = ((offset >> SECTOR_BITS) % dsk->sectors_per_table) / dsk->sectors_per_grain;
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if (grain_index >= dsk->grain_table_size) {
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fprintf(stderr, "grain to large");
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return -1;
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}
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if (l2dir[grain_index] == 0)
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goto zero_fill;
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if (read_physical(in_fd, (l2dir[l2index] << SECTOR_BITS) + granule_offset, length, buffer) != length)
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return 0;
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if (read_physical(in_fd, (l2dir[grain_index] << SECTOR_BITS) + granule_offset, length, buffer) != length) {
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fprintf(stderr, "read error 2\n");
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return -1;
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}
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write(out_fd, buffer, length);
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return length;
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zero_fill:
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/* the last chunk of the file can not be sparse
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* or the file will be truncated */
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if (offset + length < disk_limit) {
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memset(buffer, 0, length);
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write(out_fd, buffer, length);
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if (offset + length >= disk_limit) {
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if (lseek64(out_fd, length-1, SEEK_CUR) == (off_t)-1)
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perror("lseek");
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/* write the last NULL byte instead of seeking */
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const char nil = 0;
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write(out_fd, &nil, 1);
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} else {
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if (lseek(out_fd, length, SEEK_CUR) == (off_t)-1)
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if (lseek64(out_fd, length, SEEK_CUR) == (off_t)-1)
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perror("lseek");
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}
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return length;
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}
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int open_vmdk(const char *filename)
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static int open_vmdk4(int fd)
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{
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int fd = open(filename, O_RDONLY | O_LARGEFILE);
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if (fd == -1)
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{
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perror(filename);
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return -1;
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}
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if (read(fd, &header, sizeof(header)) != sizeof(header))
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{
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if (read(fd, &header4, sizeof(header4)) != sizeof(header4)) {
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perror("read from disk");
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return -1;
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}
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granule_size = header4.granularity << SECTOR_BITS;
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disk_limit = header4.capacity << SECTOR_BITS;
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cached_l2dir = -1;
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vdsk.grain_table_size = header4.num_gtes_per_gte;
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vdsk.sectors_per_grain = header4.granularity;
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vdsk.sectors_per_table = vdsk.grain_table_size * vdsk.sectors_per_grain;
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vdsk.directory_size = (header4.capacity + vdsk.sectors_per_table - 1) / vdsk.sectors_per_table + 1;
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if (memcmp(header.magic, "COWD", 4) != 0)
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{
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fprintf(stderr, "%s is not a VMware virtual disk image\n", filename);
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if (read_l1dir(fd, header4.rgd_offset, vdsk.directory_size))
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return -1;
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return 0;
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}
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static int open_vmdk3(int fd)
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{
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if (read(fd, &header, sizeof(header)) != sizeof(header)) {
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perror("read from disk\n");
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return -1;
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}
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granule_size = header.granularity << SECTOR_BITS;
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if (read_physical(fd, header.l1dir_sector << SECTOR_BITS, sizeof(l1dir), (char *)l1dir) != sizeof(l1dir))
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vdsk.sectors_per_grain = header.granularity;
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vdsk.grain_table_size = L2_SIZE;
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vdsk.sectors_per_table = vdsk.grain_table_size * vdsk.sectors_per_grain;
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vdsk.directory_size = L1_SIZE;
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if (read_l1dir(fd, header.l1dir_offset, L1_SIZE))
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return -1;
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disk_limit = header.disk_sectors << SECTOR_BITS;
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return fd;
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}
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static int open_vmdk(const char *filename)
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{
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int fd = open(filename, O_RDONLY | O_LARGEFILE);
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if (fd == -1) {
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perror(filename);
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return -1;
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}
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char magic[4];
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if (read(fd, &magic, sizeof(magic)) != sizeof(magic)) {
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perror("read from disk");
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return -1;
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}
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if (!memcmp(magic, "KDMV", sizeof(magic))) {
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open_vmdk4(fd);
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} else if (!memcmp(magic, "COWD", sizeof(magic))) {
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open_vmdk3(fd);
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} else {
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fprintf(stderr, "%s is not a VMware virtual disk image\n", filename);
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return -1;
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}
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cached_l2dir = -1;
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return fd;
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}
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void help(void)
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static void help(void)
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{
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printf("vmdk2raw\n"
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"usage: vmdk2raw vmware_image output_image\n"
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"\n"
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"vmware_image a vmware 2.x/3.x cow image\n"
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"vmware_image a vmware cow image\n"
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"output_image the created disk image\n"
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);
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exit(1);
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}
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#define BUF_SIZE granule_size
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void copy_disk(in_fd, out_fd)
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#define BUF_SIZE 0x10000
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static void copy_disk(in_fd, out_fd)
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{
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char buf[BUF_SIZE];
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off64_t i = 0;
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int ret;
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while (i < disk_limit) {
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i += copy_virtual(in_fd, out_fd, i, buf, sizeof(buf));
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ret = copy_virtual(&vdsk, in_fd, out_fd, i, buf, sizeof(buf));
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if (ret < 0) {
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fprintf(stderr, "copying failed\n");
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exit(-1);
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}
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i += ret;
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}
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}
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@ -170,7 +249,7 @@ int main(int argc, char **argv)
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return -1;
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}
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out_fd = open(argv[2], O_WRONLY | O_CREAT | O_TRUNC, S_IRUSR | S_IWUSR);
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out_fd = open(argv[2], O_WRONLY | O_LARGEFILE | O_CREAT | O_TRUNC, S_IRUSR | S_IWUSR);
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if (out_fd < 0) {
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perror(argv[2]);
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return -1;
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