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Implement differencing VHD support in vhd_format_sectors

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This commit is contained in:
shermp
2019-01-03 09:34:59 +13:00
parent 47fa861bab
commit d314b5ee70
1 changed files with 10 additions and 2 deletions
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12
minivhd.c
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@@ -743,6 +743,10 @@ int vhd_write_sectors(VHDMeta *vhdm, FILE *f, int offset, int nr_sectors, void *
}
return 0;
}
/* Fill specified sectors with zero bytes.
Note, this is potentially very expensive for differencing VHD
images, and can lead to the differencing VHD ballooning in size. */
int vhd_format_sectors(VHDMeta *vhdm, FILE *f, int offset, int nr_sectors)
{
int transfer_sectors = nr_sectors;
@@ -753,7 +757,7 @@ int vhd_format_sectors(VHDMeta *vhdm, FILE *f, int offset, int nr_sectors)
transfer_sectors = total_sectors - offset;
}
if (vhdm->type == VHD_DYNAMIC)
if (vhdm->type != VHD_FIXED)
{
int sbsz = VHD_SECT_BM_SIZE / VHD_SECTOR_SZ;
int prev_blk, curr_blk;
@@ -763,7 +767,11 @@ int vhd_format_sectors(VHDMeta *vhdm, FILE *f, int offset, int nr_sectors)
for (s = offset; s <= ls; s++)
{
curr_blk = s / vhdm->sparse_spb;
if (vhdm->sparse_bat_arr[curr_blk] != VHD_SPARSE_BLK)
if (vhdm->sparse_bat_arr[curr_blk] == VHD_SPARSE_BLK && vhdm->type == VHD_DIFF)
{
vhd_create_blk(vhdm, f, curr_blk);
}
if (vhdm->sparse_bat_arr[curr_blk] != VHD_SPARSE_BLK || vhdm->type == VHD_DIFF)
{
if (curr_blk != prev_blk)
{