d/freebsd-skq
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Commit rough but working code:

Browse Source 
o   The VMDK image can be queried and comverted by qemu-img
o   VMware Fusion finds no errors when recovering using
    'vmware-vdiskmanager -R' and the disk can be added to any
    vortual machine.
This commit is contained in:
marcel 2014-05-15 00:24:49 +00:00
parent fb177229cf
commit 5a1f714ca6
1 changed files with 83 additions and 45 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

128
vmdk.c
View File

@ -41,6 +41,9 @@ __FBSDID("$FreeBSD$");
#include "format.h"
#include "mkimg.h"
#define VMDK_MIN_GRAIN_SIZE 8192
#define VMDK_SECTOR_SIZE 512
struct vmdk_header {
uint32_t magic;
#define VMDK_MAGIC 0x564d444b
@ -61,7 +64,7 @@ struct vmdk_header {
uint64_t gd_offset;
uint64_t overhead;
uint8_t unclean;
uint8_t nl_test[4];
uint32_t nl_test;
#define VMDK_NL_TEST 0x0a200d0a
uint16_t compress;
#define VMDK_COMPRESS_NONE 0
@ -84,60 +87,95 @@ static const char desc_fmt[] =
"ddb.geometry.heads = \"%u\"\n"
"ddb.geometry.sectors = \"%u\"\n";
static int
vmdk_resize(lba_t imgsz __unused)
{
static uint64_t grainsz;
/*
* Caulculate optimal grain size and round image size to
* a multiple of the grain size.
*/
return (ENOSYS);
static int
vmdk_resize(lba_t imgsz)
{
uint64_t imagesz;
imagesz = imgsz * secsz;
grainsz = (blksz < VMDK_MIN_GRAIN_SIZE) ? VMDK_MIN_GRAIN_SIZE : blksz;
imagesz = (imagesz + grainsz - 1) & ~(grainsz - 1);
if (verbose)
fprintf(stderr, "VMDK: image size = %ju, grain size = %ju\n",
(uintmax_t)imagesz, (uintmax_t)grainsz);
grainsz /= VMDK_SECTOR_SIZE;
return (image_set_size(imagesz / secsz));
}
static int
vmdk_write(int fd __unused)
vmdk_write(int fd)
{
struct vmdk_header hdr;
uint32_t *gt, *gd;
char *desc;
lba_t imgsz;
int desc_len;
uint64_t imagesz;
size_t gdsz, gtsz;
uint32_t sec;
int desc_len, n, ngrains, ngts;
imgsz = image_get_size();
desc_len = asprintf(&desc, desc_fmt, 1 /*version*/, 0 /*CID*/,
(uintmax_t)imgsz /*size*/, "mkimg.vmdk" /*name*/,
imagesz = (image_get_size() * secsz) / VMDK_SECTOR_SIZE;
memset(&hdr, 0, sizeof(hdr));
le32enc(&hdr.magic, VMDK_MAGIC);
le32enc(&hdr.version, VMDK_VERSION);
le32enc(&hdr.flags, VMDK_FLAGS_NL_TEST | VMDK_FLAGS_RGT_USED);
le64enc(&hdr.capacity, imagesz);
le64enc(&hdr.grain_size, grainsz);
n = asprintf(&desc, desc_fmt, 1 /*version*/, 0 /*CID*/,
(uintmax_t)imagesz /*size*/, "" /*name*/,
ncyls /*cylinders*/, nheads /*heads*/, nsecs /*sectors*/);
desc_len = (desc_len + 512 - 1) & ~(512 - 1);
desc_len = (n + VMDK_SECTOR_SIZE - 1) & ~(VMDK_SECTOR_SIZE - 1);
desc = realloc(desc, desc_len);
memset(desc + n, 0, desc_len - n);
/*
* Steps:
* 1. create embedded descriptor. We need to know its size upfront.
* 2. create and populate grain directory and tables. This means
* iterating over the written sectors of the image.
* 3. (optional) create and populate redundant directory and
* tables while doing step 2.
* 4. create and write header (512 bytes)
* 5. write descriptor (# x 512 bytes)
* 6. write grain directory and tables (# x 512 bytes)
* 7. (optional) write redundant directory and tables (# x 512 bytes)
* 8. align to grain size.
* 9. create and write grains.
*
* Notes:
* 1. The drain directory is being ignored by some implementations
* so the tables must be at their known/assumed offsets.
* 2. Default grain size is 128 sectors (= 64KB).
* 3. There are 512 entries in a table, each entry being 32-bits.
* Thus, a grain table is 2KB (= 4 sectors).
* 4. Each grain table covers 512 * 128 sectors (= 64K sectors).
* With 512-bytes per sector, this yields 32MB of disk data.
* 5. For smaller images, the grain size can be reduced to avoid
* rounding the output file to 32MB. The minimum grain size is
* 8 sectors (= 4KB). The smallest VMDK file is 2MB without
* overhead (= metadata).
* 6. The capacity is a multiple of the grain size.
*/
return (ENOSYS);
le64enc(&hdr.desc_offset, 1);
le64enc(&hdr.desc_size, desc_len / VMDK_SECTOR_SIZE);
le32enc(&hdr.ngtes, VMDK_NGTES);
sec = desc_len / VMDK_SECTOR_SIZE + 1;
le64enc(&hdr.rgd_offset, sec);
le64enc(&hdr.gd_offset, sec);
ngrains = imagesz / grainsz;
ngts = (ngrains + VMDK_NGTES - 1) / VMDK_NGTES;
gdsz = (ngts * sizeof(uint32_t) + VMDK_SECTOR_SIZE - 1) &
~(VMDK_SECTOR_SIZE - 1);
gd = malloc(gdsz);
memset(gd, 0, gdsz);
sec += gdsz / VMDK_SECTOR_SIZE;
for (n = 0; n < ngts; n++) {
le32enc(gd + n, sec);
sec += VMDK_NGTES * sizeof(uint32_t) / VMDK_SECTOR_SIZE;
}
sec = (sec + grainsz - 1) & ~(grainsz - 1);
if (verbose)
fprintf(stderr, "VMDK: overhead = %ju\n",
(uintmax_t)(sec * VMDK_SECTOR_SIZE));
le64enc(&hdr.overhead, sec);
be32enc(&hdr.nl_test, VMDK_NL_TEST);
gtsz = ngts * VMDK_NGTES * sizeof(uint32_t);
gt = malloc(gtsz);
memset(gt, 0, gtsz);
for (n = 0; n < ngrains; n++)
le32enc(gt + n, sec + n * grainsz);
write(fd, &hdr, VMDK_SECTOR_SIZE);
write(fd, desc, desc_len);
write(fd, gd, gdsz);
write(fd, gt, gtsz);
lseek(fd, sec * VMDK_SECTOR_SIZE, SEEK_SET);
return (image_copyout(fd));
}
static struct mkimg_format vmdk_format = {