tree df9115b36ef602d0550e9c2626b5c53a705425ac
parent 1da92779e2e8f309d5aecbbed346e7f812b174e8
author Adam Manzanares <adam.manzanares@wdc.com> 1527011537 -0700
committer Al Viro <viro@zeniv.linux.org.uk> 1527778254 -0400

block: add ioprio_check_cap function

Aio per command iopriority support introduces a second interface between
userland and the kernel capable of passing iopriority. The aio interface also
needs the ability to verify that the submitting context has sufficient
privileges to submit IOPRIO_RT commands. This patch creates the
ioprio_check_cap function to be used by the ioprio_set system call and also by
the aio interface.

Signed-off-by: Adam Manzanares <adam.manzanares@wdc.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Jeff Moyer <jmoyer@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>