EX-7601 llite: allow aligned DIO with compression

EX-7601 llite: allow aligned DIO with compression

If a DIO is fully aligned to compression chunk boundaries,
it is safe to do on a compressed file, so allow it.

Signed-off-by: Patrick Farrell <pfarrell@whamcloud.com>
Change-Id: If8fa3397c9424254538738f4d77f9f50d1c21129
Reviewed-on: https://review.whamcloud.com/c/ex/lustre-release/+/51529
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Sebastien Buisson <sbuisson@ddn.com>