On 2018-01-26 15:59, Alberto Garcia wrote: > qcow2_get_cluster_offset() checks how many contiguous bytes are > available at a given offset. The returned number of bytes is limited > by the amount that can be addressed without having to load more than > one L2 table. > > Since we'll be loading L2 slices instead of full tables this patch > changes the limit accordingly using the size of the L2 slice for the > calculations instead of the full table size. > > One consequence of this is that with small L2 slices operations such > as 'qemu-img map' will need to iterate in more steps because each > qcow2_get_cluster_offset() call will potentially return a smaller > number. However the code is already prepared for that so this doesn't > break semantics. > > The l2_table variable is also renamed to l2_slice to reflect this, and > offset_to_l2_index() is replaced with offset_to_l2_slice_index(). > > Signed-off-by: Alberto Garcia <be...@igalia.com> > Reviewed-by: Eric Blake <ebl...@redhat.com> > --- > block/qcow2-cluster.c | 30 +++++++++++++++--------------- > 1 file changed, 15 insertions(+), 15 deletions(-)
Reviewed-by: Max Reitz <mre...@redhat.com>
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