diff options
| -rw-r--r-- | qemu-doc.texi | 8 | ||||
| -rw-r--r-- | vmdk.h | 24 | ||||
| -rw-r--r-- | vmdk2raw.c | 195 |
3 files changed, 167 insertions, 60 deletions
diff --git a/qemu-doc.texi b/qemu-doc.texi index dfa3639..5c44879 100644 --- a/qemu-doc.texi +++ b/qemu-doc.texi @@ -574,6 +574,14 @@ Since holes are used, the displayed size of the COW disk image is not the real one. To know it, use the @code{ls -ls} command. @end enumerate +@subsection Convert VMware disk images to raw disk images + +You can use the tool @file{vmdk2raw} to convert VMware disk images to +raw disk images directly usable by QEMU. The syntax is: +@example +vmdk2raw vmware_image output_image +@end example + @section Network emulation QEMU simulates up to 6 networks cards (NE2000 boards). Each card can @@ -32,12 +32,11 @@ struct cowdisk_header { - char magic[4]; /* COWD */ uint32_t version; uint32_t flags; uint32_t disk_sectors; uint32_t granularity; - uint32_t l1dir_sector; + uint32_t l1dir_offset; uint32_t l1dir_size; uint32_t file_sectors; uint32_t cylinders; @@ -50,3 +49,24 @@ struct cowdisk_header2 uint32_t parent_ts; uint32_t timestamp; }; + +/* based on vdk 3.1 10-11-2003 by Ken Kato */ + +struct vmdisk_header +{ + uint32_t version; + uint32_t flags; + + int64_t capacity; + int64_t granularity; + int64_t desc_offset; + int64_t desc_size; + int32_t num_gtes_per_gte; + int64_t rgd_offset; + int64_t gd_offset; + int64_t grain_offset; + + char filler[1]; + + char check_bytes[4]; +}; @@ -30,131 +30,210 @@ #include "vmdk.h" #include "config-host.h" -struct cowdisk_header header; -struct cowdisk_header2 header2; -off_t disk_base, disk_limit; -unsigned int granule_size; -uint32_t l1dir[L1_SIZE]; - -unsigned int cached_l2dir; -uint32_t l2dir[L2_SIZE]; - -size_t read_physical(int fd, off64_t offset, size_t length, void *buffer) +static struct cowdisk_header header; +static struct vmdisk_header header4; +static off64_t disk_limit; +static unsigned int granule_size; +static uint32_t *l1dir; + +static unsigned int cached_l2dir; +static uint32_t l2dir[L2_SIZE]; + +static struct vmdk_prm { + uint32_t grain_table_size; + uint32_t sectors_per_grain; + uint32_t sectors_per_table; + uint32_t directory_size; +} vdsk; + +static size_t read_physical(int fd, off64_t offset, size_t length, void *buffer) { size_t n; - if (lseek64(fd, offset, SEEK_SET) == -1) - { - perror("lseek"); + if (lseek64(fd, offset, SEEK_SET) == -1) { + printf(" error trying to seek lseek to %lld", offset); return -1; } n = read(fd, buffer, length); - if (n == -1) - { - perror("read from disk"); + + if (n == -1) { + printf("read from disk %lld", offset); return -1; } return n; } -size_t copy_virtual(int in_fd, int out_fd, off64_t offset, void *buffer, size_t length) +static int read_l1dir(int fd, size_t offset, int num) +{ + l1dir = malloc(sizeof(*l1dir) * num); + if (!l1dir) + return -1; + return read_physical(fd, offset << SECTOR_BITS, sizeof(*l1dir) * num, (char *)l1dir) != (sizeof(*l1dir) * num); +} + +static int read_l2dir(int fd, size_t offset, int num) { - unsigned int granule_index, granule_offset; - unsigned int l1index, l2index; + return read_physical(fd, offset << SECTOR_BITS, sizeof(l2dir[0]) * num, (char *)l2dir) != sizeof(l2dir); +} - granule_index = offset / granule_size; +static size_t copy_virtual(struct vmdk_prm *dsk, int in_fd, int out_fd, off64_t offset, void *buffer, size_t length) +{ + + unsigned int granule_offset; + unsigned int grain_index; + unsigned int sector_map_idx; + granule_offset = offset % granule_size; length = MIN(length, granule_size - granule_offset); length = MIN(length, disk_limit - offset); - l1index = (granule_index >> L2_BITS) & L1_MASK; - l2index = granule_index & L2_MASK; + sector_map_idx = (offset >> SECTOR_BITS) / dsk->sectors_per_table; + + if (sector_map_idx >= dsk->directory_size) { + fprintf(stderr, "cannot locate grain table for %d in %d\n", sector_map_idx, dsk->directory_size); + return -1; + } - if (l1dir[l1index] == 0) + if (l1dir[sector_map_idx] == 0) goto zero_fill; + + if (sector_map_idx != cached_l2dir) { + if (read_l2dir(in_fd, l1dir[sector_map_idx], dsk->grain_table_size)) { + fprintf(stderr, "read failed\n"); + return -1; + } + cached_l2dir = sector_map_idx; + } - if (l1index != cached_l2dir) - { - if (read_physical(in_fd, (l1dir[l1index] << SECTOR_BITS), sizeof(l2dir), (char *)l2dir) != sizeof(l2dir)) - return 0; - - cached_l2dir = l1index; + grain_index = ((offset >> SECTOR_BITS) % dsk->sectors_per_table) / dsk->sectors_per_grain; + + if (grain_index >= dsk->grain_table_size) { + fprintf(stderr, "grain to large"); + return -1; } - if (l2dir[l2index] == 0) + if (l2dir[grain_index] == 0) goto zero_fill; - if (read_physical(in_fd, (l2dir[l2index] << SECTOR_BITS) + granule_offset, length, buffer) != length) - return 0; - + if (read_physical(in_fd, (l2dir[grain_index] << SECTOR_BITS) + granule_offset, length, buffer) != length) { + fprintf(stderr, "read error 2\n"); + return -1; + } + write(out_fd, buffer, length); return length; zero_fill: /* the last chunk of the file can not be sparse * or the file will be truncated */ - if (offset + length < disk_limit) { - memset(buffer, 0, length); - write(out_fd, buffer, length); + if (offset + length >= disk_limit) { + if (lseek64(out_fd, length-1, SEEK_CUR) == (off_t)-1) + perror("lseek"); + /* write the last NULL byte instead of seeking */ + const char nil = 0; + write(out_fd, &nil, 1); } else { - if (lseek(out_fd, length, SEEK_CUR) == (off_t)-1) + if (lseek64(out_fd, length, SEEK_CUR) == (off_t)-1) perror("lseek"); } return length; } - -int open_vmdk(const char *filename) +static int open_vmdk4(int fd) { - int fd = open(filename, O_RDONLY | O_LARGEFILE); - if (fd == -1) - { - perror(filename); + if (read(fd, &header4, sizeof(header4)) != sizeof(header4)) { + perror("read from disk"); return -1; } + + granule_size = header4.granularity << SECTOR_BITS; + disk_limit = header4.capacity << SECTOR_BITS; + + cached_l2dir = -1; + vdsk.grain_table_size = header4.num_gtes_per_gte; + vdsk.sectors_per_grain = header4.granularity; + vdsk.sectors_per_table = vdsk.grain_table_size * vdsk.sectors_per_grain; + vdsk.directory_size = (header4.capacity + vdsk.sectors_per_table - 1) / vdsk.sectors_per_table + 1; - if (read(fd, &header, sizeof(header)) != sizeof(header)) - { - perror("read from disk"); + if (read_l1dir(fd, header4.rgd_offset, vdsk.directory_size)) return -1; - } + + return 0; + +} - if (memcmp(header.magic, "COWD", 4) != 0) - { - fprintf(stderr, "%s is not a VMware virtual disk image\n", filename); +static int open_vmdk3(int fd) +{ + if (read(fd, &header, sizeof(header)) != sizeof(header)) { + perror("read from disk\n"); return -1; } - granule_size = header.granularity << SECTOR_BITS; - if (read_physical(fd, header.l1dir_sector << SECTOR_BITS, sizeof(l1dir), (char *)l1dir) != sizeof(l1dir)) + vdsk.sectors_per_grain = header.granularity; + vdsk.grain_table_size = L2_SIZE; + vdsk.sectors_per_table = vdsk.grain_table_size * vdsk.sectors_per_grain; + vdsk.directory_size = L1_SIZE; + if (read_l1dir(fd, header.l1dir_offset, L1_SIZE)) return -1; disk_limit = header.disk_sectors << SECTOR_BITS; + return fd; +} + +static int open_vmdk(const char *filename) +{ + int fd = open(filename, O_RDONLY | O_LARGEFILE); + if (fd == -1) { + perror(filename); + return -1; + } + + char magic[4]; + if (read(fd, &magic, sizeof(magic)) != sizeof(magic)) { + perror("read from disk"); + return -1; + } + + if (!memcmp(magic, "KDMV", sizeof(magic))) { + open_vmdk4(fd); + } else if (!memcmp(magic, "COWD", sizeof(magic))) { + open_vmdk3(fd); + } else { + fprintf(stderr, "%s is not a VMware virtual disk image\n", filename); + return -1; + } + cached_l2dir = -1; return fd; } -void help(void) +static void help(void) { printf("vmdk2raw\n" "usage: vmdk2raw vmware_image output_image\n" "\n" - "vmware_image a vmware 2.x/3.x cow image\n" + "vmware_image a vmware cow image\n" "output_image the created disk image\n" ); exit(1); } -#define BUF_SIZE granule_size -void copy_disk(in_fd, out_fd) +#define BUF_SIZE 0x10000 +static void copy_disk(in_fd, out_fd) { char buf[BUF_SIZE]; off64_t i = 0; + int ret; while (i < disk_limit) { - i += copy_virtual(in_fd, out_fd, i, buf, sizeof(buf)); + ret = copy_virtual(&vdsk, in_fd, out_fd, i, buf, sizeof(buf)); + if (ret < 0) { + fprintf(stderr, "copying failed\n"); + exit(-1); + } + i += ret; } } @@ -170,7 +249,7 @@ int main(int argc, char **argv) return -1; } - out_fd = open(argv[2], O_WRONLY | O_CREAT | O_TRUNC, S_IRUSR | S_IWUSR); + out_fd = open(argv[2], O_WRONLY | O_LARGEFILE | O_CREAT | O_TRUNC, S_IRUSR | S_IWUSR); if (out_fd < 0) { perror(argv[2]); return -1; |