static uint64_t
vhd_resize(uint64_t origsz)
{
struct vhd_geom geom;
uint64_t newsz;
/*
* Round the image size to the pre-determined geometry that
* matches the image size. This circular dependency implies
* that we need to loop to handle boundary conditions.
* The first time, newsz equals origsz and the geometry will
* typically yield a new size that's smaller. We keep adding
* cylinder's worth of sectors to the new size until its
* larger or equal or origsz. But during those iterations,
* the geometry can change, so we need to account for that.
*/
newsz = origsz;
while (1) {
vhd_geometry(newsz, &geom);
newsz = (int64_t)geom.cylinders * geom.heads *
geom.sectors * VHD_SECTOR_SIZE;
if (newsz >= origsz)
break;
newsz += geom.heads * geom.sectors * VHD_SECTOR_SIZE;
}
return (newsz);
}
static int
vhd_fix_resize(lba_t imgsz)
{
struct vhd_geom geom;
int64_t imagesz;
/*
* Round the image size to the pre-determined geometry that
* matches the image size. This circular dependency implies
* that we need to loop to handle boundary conditions.
*/
imgsz *= secsz;
imagesz = imgsz;
while (1) {
vhd_geometry(imagesz, &geom);
imagesz = (int64_t)geom.cylinders * geom.heads *
geom.sectors * VHD_SECTOR_SIZE;
if (imagesz >= imgsz)
break;
imagesz += geom.heads * geom.sectors * VHD_SECTOR_SIZE;
}
/*
* Azure demands that images are a whole number of megabytes.
*/
imagesz = (imagesz + 0xfffffULL) & ~0xfffffULL;
return (image_set_size(imagesz / secsz));
}
static void
vhd_make_footer(struct vhd_footer *footer, uint64_t image_size,
uint32_t disk_type, uint64_t data_offset)
{
uuid_t id;
memset(footer, 0, sizeof(*footer));
be64enc(&footer->cookie, VHD_FOOTER_COOKIE);
be32enc(&footer->features, VHD_FEATURES_RESERVED);
be32enc(&footer->version, VHD_VERSION);
be64enc(&footer->data_offset, data_offset);
be32enc(&footer->timestamp, vhd_timestamp());
be32enc(&footer->creator_tool, VHD_CREATOR_TOOL);
be32enc(&footer->creator_version, VHD_CREATOR_VERSION);
be32enc(&footer->creator_os, VHD_CREATOR_OS);
be64enc(&footer->original_size, image_size);
be64enc(&footer->current_size, image_size);
vhd_geometry(footer, image_size);
be32enc(&footer->disk_type, disk_type);
mkimg_uuid(&id);
vhd_uuid_enc(&footer->id, &id);
be32enc(&footer->checksum, vhd_checksum(footer, sizeof(*footer)));
}
