[PATCH 05/11] block: add helpers for setting/checking write hint validity
From: Jens Axboe <axboe@kernel.dk>
Date: 2017-06-15 03:45:30
Also in:
linux-fsdevel
Subsystem:
block layer, the rest · Maintainers:
Jens Axboe, Linus Torvalds
We map the RWF_WRITE_* life time flags to the internal flags. Drivers can then, in turn, map those flags to a suitable stream type. Signed-off-by: Jens Axboe <axboe@kernel.dk> --- block/bio.c | 16 ++++++++++++++++ include/linux/bio.h | 1 + include/linux/blk_types.h | 5 +++++ 3 files changed, 22 insertions(+)
diff --git a/block/bio.c b/block/bio.c
index 888e7801c638..8804439945b2 100644
--- a/block/bio.c
+++ b/block/bio.c@@ -2082,6 +2082,22 @@ void bio_clone_blkcg_association(struct bio *dst, struct bio *src) #endif /* CONFIG_BLK_CGROUP */ +static const unsigned int rwf_write_to_opf_flag[] = { + 0, REQ_WRITE_SHORT, REQ_WRITE_MEDIUM, REQ_WRITE_LONG, REQ_WRITE_EXTREME +}; + +/* + * 'stream_flags' is one of RWF_WRITE_LIFE_* values + */ +unsigned int bio_op_write_hint(unsigned int rwf_flags) +{ + if (WARN_ON_ONCE(rwf_flags >= ARRAY_SIZE(rwf_write_to_opf_flag))) + return 0; + + return rwf_write_to_opf_flag[rwf_flags]; +} +EXPORT_SYMBOL_GPL(bio_op_write_hint); + static void __init biovec_init_slabs(void) { int i;
diff --git a/include/linux/bio.h b/include/linux/bio.h
index d1b04b0e99cf..debd60d641dd 100644
--- a/include/linux/bio.h
+++ b/include/linux/bio.h@@ -443,6 +443,7 @@ extern struct bio *bio_copy_kern(struct request_queue *, void *, unsigned int, gfp_t, int); extern void bio_set_pages_dirty(struct bio *bio); extern void bio_check_pages_dirty(struct bio *bio); +extern unsigned int bio_op_write_hint(unsigned int rwf_flags); void generic_start_io_acct(int rw, unsigned long sectors, struct hd_struct *part);
diff --git a/include/linux/blk_types.h b/include/linux/blk_types.h
index 57d1eb530799..23646eb433e7 100644
--- a/include/linux/blk_types.h
+++ b/include/linux/blk_types.h@@ -323,4 +323,9 @@ struct blk_rq_stat { u64 batch; }; +static inline bool op_write_hint_valid(unsigned int opf) +{ + return (opf & REQ_WRITE_LIFE_MASK) != 0; +} + #endif /* __LINUX_BLK_TYPES_H */
--
2.7.4