dm thin: optimize power of two block size
dm-thin will be most likely used with a block size that is a power of two. So it should be optimized for this case. This patch changes division and modulo operations to shifts and bit masks if block size is a power of two. A test that bi_sector is divisible by a block size is removed from io_overlaps_block. Device mapper never sends bios that span a block boundary. Consequently, if we tested that bi_size is equivalent to block size, bi_sector must already be on a block boundary. Signed-off-by:Mikulas Patocka <mpatocka@redhat.com> Signed-off-by:
Alasdair G Kergon <agk@redhat.com>
parent
49296309
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