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vpc: Round up image size during fixed image creation 

The geometry calculation algorithm from the VHD spec rounds the image
size down if it doesn't exactly match a geometry. During image
conversion, this causes the image to be truncated. For dynamic images,
we already have code in place to round up instead, let's do the same for
fixed images.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Kevin Wolf 2012-02-07 10:15:47 +01:00
parent 24da78dbb5
commit ecd880d9ee
1 changed files with 10 additions and 13 deletions
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23
block/vpc.c
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@ -685,24 +685,21 @@ static int vpc_create(const char *filename, QEMUOptionParameter *options)
return -EIO;
}
/*
* Calculate matching total_size and geometry. Increase the number of
* sectors requested until we get enough (or fail). This ensures that
* qemu-img convert doesn't truncate images, but rather rounds up.
*/
total_sectors = total_size / BDRV_SECTOR_SIZE;
if (disk_type == VHD_DYNAMIC) {
/* Calculate matching total_size and geometry. Increase the number of
sectors requested until we get enough (or fail). */
for (i = 0; total_sectors > (int64_t)cyls * heads * secs_per_cyl;
i++) {
if (calculate_geometry(total_sectors + i,
&cyls, &heads, &secs_per_cyl)) {
ret = -EFBIG;
goto fail;
}
}
} else {
if (calculate_geometry(total_sectors, &cyls, &heads, &secs_per_cyl)) {
for (i = 0; total_sectors > (int64_t)cyls * heads * secs_per_cyl; i++) {
if (calculate_geometry(total_sectors + i, &cyls, &heads,
&secs_per_cyl))
{
ret = -EFBIG;
goto fail;
}
}
total_sectors = (int64_t) cyls * heads * secs_per_cyl;
/* Prepare the Hard Disk Footer */