block: fix physical_block_size calculation
Both SCSI and virtio expect the physical block size relative to the
logical block size. So get the factor first before calculating the
log2.
Reported-by: Mike Cao <bcao@redhat.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
diff --git a/block_int.h b/block_int.h
index e3bfd19..b64a009 100644
--- a/block_int.h
+++ b/block_int.h
@@ -224,7 +224,9 @@
{
unsigned int exp = 0, size;
- for (size = conf->physical_block_size; size > 512; size >>= 1) {
+ for (size = conf->physical_block_size;
+ size > conf->logical_block_size;
+ size >>= 1) {
exp++;
}
