Commit rough but working code:
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
parent
fb177229cf
commit
5a1f714ca6
128
vmdk.c
128
vmdk.c
@ -41,6 +41,9 @@ __FBSDID("$FreeBSD$");
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#include "format.h"
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#include "mkimg.h"
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#define VMDK_MIN_GRAIN_SIZE 8192
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#define VMDK_SECTOR_SIZE 512
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struct vmdk_header {
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uint32_t magic;
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#define VMDK_MAGIC 0x564d444b
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@ -61,7 +64,7 @@ struct vmdk_header {
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uint64_t gd_offset;
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uint64_t overhead;
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uint8_t unclean;
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uint8_t nl_test[4];
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uint32_t nl_test;
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#define VMDK_NL_TEST 0x0a200d0a
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uint16_t compress;
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#define VMDK_COMPRESS_NONE 0
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@ -84,60 +87,95 @@ static const char desc_fmt[] =
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"ddb.geometry.heads = \"%u\"\n"
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"ddb.geometry.sectors = \"%u\"\n";
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static int
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vmdk_resize(lba_t imgsz __unused)
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{
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static uint64_t grainsz;
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/*
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* Caulculate optimal grain size and round image size to
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* a multiple of the grain size.
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*/
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return (ENOSYS);
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static int
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vmdk_resize(lba_t imgsz)
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{
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uint64_t imagesz;
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imagesz = imgsz * secsz;
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grainsz = (blksz < VMDK_MIN_GRAIN_SIZE) ? VMDK_MIN_GRAIN_SIZE : blksz;
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imagesz = (imagesz + grainsz - 1) & ~(grainsz - 1);
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if (verbose)
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fprintf(stderr, "VMDK: image size = %ju, grain size = %ju\n",
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(uintmax_t)imagesz, (uintmax_t)grainsz);
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grainsz /= VMDK_SECTOR_SIZE;
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return (image_set_size(imagesz / secsz));
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}
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static int
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vmdk_write(int fd __unused)
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vmdk_write(int fd)
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{
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struct vmdk_header hdr;
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uint32_t *gt, *gd;
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char *desc;
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lba_t imgsz;
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int desc_len;
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uint64_t imagesz;
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size_t gdsz, gtsz;
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uint32_t sec;
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int desc_len, n, ngrains, ngts;
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imgsz = image_get_size();
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desc_len = asprintf(&desc, desc_fmt, 1 /*version*/, 0 /*CID*/,
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(uintmax_t)imgsz /*size*/, "mkimg.vmdk" /*name*/,
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imagesz = (image_get_size() * secsz) / VMDK_SECTOR_SIZE;
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memset(&hdr, 0, sizeof(hdr));
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le32enc(&hdr.magic, VMDK_MAGIC);
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le32enc(&hdr.version, VMDK_VERSION);
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le32enc(&hdr.flags, VMDK_FLAGS_NL_TEST | VMDK_FLAGS_RGT_USED);
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le64enc(&hdr.capacity, imagesz);
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le64enc(&hdr.grain_size, grainsz);
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n = asprintf(&desc, desc_fmt, 1 /*version*/, 0 /*CID*/,
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(uintmax_t)imagesz /*size*/, "" /*name*/,
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ncyls /*cylinders*/, nheads /*heads*/, nsecs /*sectors*/);
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desc_len = (desc_len + 512 - 1) & ~(512 - 1);
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desc_len = (n + VMDK_SECTOR_SIZE - 1) & ~(VMDK_SECTOR_SIZE - 1);
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desc = realloc(desc, desc_len);
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memset(desc + n, 0, desc_len - n);
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/*
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* Steps:
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* 1. create embedded descriptor. We need to know its size upfront.
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* 2. create and populate grain directory and tables. This means
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* iterating over the written sectors of the image.
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* 3. (optional) create and populate redundant directory and
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* tables while doing step 2.
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* 4. create and write header (512 bytes)
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* 5. write descriptor (# x 512 bytes)
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* 6. write grain directory and tables (# x 512 bytes)
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* 7. (optional) write redundant directory and tables (# x 512 bytes)
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* 8. align to grain size.
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* 9. create and write grains.
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*
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* Notes:
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* 1. The drain directory is being ignored by some implementations
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* so the tables must be at their known/assumed offsets.
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* 2. Default grain size is 128 sectors (= 64KB).
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* 3. There are 512 entries in a table, each entry being 32-bits.
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* Thus, a grain table is 2KB (= 4 sectors).
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* 4. Each grain table covers 512 * 128 sectors (= 64K sectors).
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* With 512-bytes per sector, this yields 32MB of disk data.
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* 5. For smaller images, the grain size can be reduced to avoid
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* rounding the output file to 32MB. The minimum grain size is
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* 8 sectors (= 4KB). The smallest VMDK file is 2MB without
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* overhead (= metadata).
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* 6. The capacity is a multiple of the grain size.
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*/
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return (ENOSYS);
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le64enc(&hdr.desc_offset, 1);
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le64enc(&hdr.desc_size, desc_len / VMDK_SECTOR_SIZE);
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le32enc(&hdr.ngtes, VMDK_NGTES);
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sec = desc_len / VMDK_SECTOR_SIZE + 1;
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le64enc(&hdr.rgd_offset, sec);
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le64enc(&hdr.gd_offset, sec);
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ngrains = imagesz / grainsz;
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ngts = (ngrains + VMDK_NGTES - 1) / VMDK_NGTES;
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gdsz = (ngts * sizeof(uint32_t) + VMDK_SECTOR_SIZE - 1) &
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~(VMDK_SECTOR_SIZE - 1);
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gd = malloc(gdsz);
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memset(gd, 0, gdsz);
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sec += gdsz / VMDK_SECTOR_SIZE;
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for (n = 0; n < ngts; n++) {
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le32enc(gd + n, sec);
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sec += VMDK_NGTES * sizeof(uint32_t) / VMDK_SECTOR_SIZE;
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}
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sec = (sec + grainsz - 1) & ~(grainsz - 1);
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if (verbose)
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fprintf(stderr, "VMDK: overhead = %ju\n",
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(uintmax_t)(sec * VMDK_SECTOR_SIZE));
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le64enc(&hdr.overhead, sec);
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be32enc(&hdr.nl_test, VMDK_NL_TEST);
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gtsz = ngts * VMDK_NGTES * sizeof(uint32_t);
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gt = malloc(gtsz);
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memset(gt, 0, gtsz);
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for (n = 0; n < ngrains; n++)
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le32enc(gt + n, sec + n * grainsz);
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write(fd, &hdr, VMDK_SECTOR_SIZE);
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write(fd, desc, desc_len);
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write(fd, gd, gdsz);
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write(fd, gt, gtsz);
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lseek(fd, sec * VMDK_SECTOR_SIZE, SEEK_SET);
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return (image_copyout(fd));
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}
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static struct mkimg_format vmdk_format = {
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