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 inititalizes kiocb ioprio value appropriately when it is not explicitly set. Fourth patch enables the feature for blkdev. Fifth patch enables the feature for iomap direct IO Note: this work is based on top of linux-vfs/for-next 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 v5: rename ki_hint_valid -> ki_hint_validate remove ki_hint_validate comment and whitespace remove IOCB_IOPRIO flag initialize kiocb to have no priority Adam Manzanares (5): block: add ioprio_check_cap function fs: Convert kiocb rw_hint from enum to u16 fs: Add aio iopriority support fs: blkdev set bio prio from kiocb prio fs: iomap dio set bio prio from kiocb prio block/ioprio.c | 22 ++++++++++++++++------ drivers/block/loop.c | 3 +++ fs/aio.c | 16 ++++++++++++++++ fs/block_dev.c | 1 + fs/iomap.c | 1 + include/linux/fs.h | 16 ++++++++++++++-- include/linux/ioprio.h | 2 ++ include/uapi/linux/aio_abi.h | 1 + 8 files changed, 54 insertions(+), 8 deletions(-) -- 2.15.1
