From: Adam Manzanares <adam.manzanares@xxxxxxx> This is the per-I/O equivalent of the ioprio_set system call. See the following link for performance implications on a SATA HDD: https://lkml.org/lkml/2016/12/6/495 First patch factors ioprio_check_cap function out of ioprio_set system call to also be used by the aio ioprio interface. Second patch converts kiocb ki_hint field to a u16 to avoid kiocb bloat. Third patch passes ioprio hint from aio iocb to kiocb and enables block_dev usage of the per I/O ioprio feature. v2: merge patches use IOCB_FLAG_IOPRIO validate intended use with IOCB_IOPRIO add linux-api and linux-block to cc v3: add ioprio_check_cap function convert kiocb ki_hint to u16 use ioprio_check_cap when adding ioprio to kiocb in aio.c v4: handle IOCB_IOPRIO in aio_prep_rw note patch 3 depends on patch 1 in commit msg Adam Manzanares (3): block: add ioprio_check_cap function fs: Convert kiocb rw_hint from enum to u16 fs: Add aio iopriority support for block_dev block/ioprio.c | 22 ++++++++++++++++------ fs/aio.c | 16 ++++++++++++++++ fs/block_dev.c | 2 ++ include/linux/fs.h | 17 +++++++++++++++-- include/linux/ioprio.h | 2 ++ include/uapi/linux/aio_abi.h | 1 + 6 files changed, 52 insertions(+), 8 deletions(-) -- 2.15.1
