From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Jens Axboe To: linux-fsdevel@vger.kernel.org, linux-block@vger.kernel.org Cc: adilger@dilger.ca, hch@infradead.org, martin.petersen@oracle.com, linux-nvme@lists.infradead.org, Jens Axboe Subject: [PATCH 2/9] block: add support for write hints in a bio Date: Mon, 19 Jun 2017 11:04:55 -0600 Message-Id: <1497891902-25737-3-git-send-email-axboe@kernel.dk> In-Reply-To: <1497891902-25737-1-git-send-email-axboe@kernel.dk> References: <1497891902-25737-1-git-send-email-axboe@kernel.dk> List-ID: No functional changes in this patch, we just set aside 3 bits in the bio/request flags, which can be used to hold a WRITE_LIFE_* life time hint. Ensure that we don't merge requests that have different life time hints assigned to them. Signed-off-by: Jens Axboe --- block/blk-merge.c | 16 ++++++++++++++++ include/linux/blk_types.h | 20 ++++++++++++++++++++ 2 files changed, 36 insertions(+) diff --git a/block/blk-merge.c b/block/blk-merge.c index cea544ec5d96..17cd0c3f872d 100644 --- a/block/blk-merge.c +++ b/block/blk-merge.c @@ -670,6 +670,14 @@ static struct request *attempt_merge(struct request_queue *q, return NULL; /* + * Don't allow merge of different streams, or for a stream with + * non-stream IO. + */ + if ((req->cmd_flags & REQ_WRITE_LIFE_MASK) != + (next->cmd_flags & REQ_WRITE_LIFE_MASK)) + return NULL; + + /* * If we are allowed to merge, then append bio list * from next to rq and release next. merge_requests_fn * will have updated segment counts, update sector @@ -788,6 +796,14 @@ bool blk_rq_merge_ok(struct request *rq, struct bio *bio) !blk_write_same_mergeable(rq->bio, bio)) return false; + /* + * Don't allow merge of different streams, or for a stream with + * non-stream IO. + */ + if ((rq->cmd_flags & REQ_WRITE_LIFE_MASK) != + (bio->bi_opf & REQ_WRITE_LIFE_MASK)) + return false; + return true; } diff --git a/include/linux/blk_types.h b/include/linux/blk_types.h index dcd45b15a3a5..fde216924aa3 100644 --- a/include/linux/blk_types.h +++ b/include/linux/blk_types.h @@ -7,6 +7,7 @@ #include #include +#include struct bio_set; struct bio; @@ -220,6 +221,9 @@ enum req_flag_bits { __REQ_PREFLUSH, /* request for cache flush */ __REQ_RAHEAD, /* read ahead, can fail anytime */ __REQ_BACKGROUND, /* background IO */ + __REQ_WRITE_HINT_SHIFT, /* 3 bits for life time hint */ + __REQ_WRITE_HINT_PAD1, + __REQ_WRITE_HINT_PAD2, /* command specific flags for REQ_OP_WRITE_ZEROES: */ __REQ_NOUNMAP, /* do not free blocks when zeroing */ @@ -240,6 +244,12 @@ enum req_flag_bits { #define REQ_PREFLUSH (1ULL << __REQ_PREFLUSH) #define REQ_RAHEAD (1ULL << __REQ_RAHEAD) #define REQ_BACKGROUND (1ULL << __REQ_BACKGROUND) +#define REQ_WRITE_SHORT (WRITE_LIFE_SHORT << __REQ_WRITE_HINT_SHIFT) +#define REQ_WRITE_MEDIUM (WRITE_LIFE_MEDIUM << __REQ_WRITE_HINT_SHIFT) +#define REQ_WRITE_LONG (WRITE_LIFE_LONG << __REQ_WRITE_HINT_SHIFT) +#define REQ_WRITE_EXTREME (WRITE_LIFE_EXTREME << __REQ_WRITE_HINT_SHIFT) + +#define REQ_WRITE_LIFE_MASK (0x7 << __REQ_WRITE_HINT_SHIFT) #define REQ_NOUNMAP (1ULL << __REQ_NOUNMAP) @@ -331,4 +341,14 @@ struct blk_rq_stat { u64 batch; }; +static inline unsigned int write_hint_to_opf(enum rw_hint hint) +{ + return hint << __REQ_WRITE_HINT_SHIFT; +} + +static inline enum rw_hint opf_to_write_hint(unsigned int opf) +{ + return (opf & REQ_WRITE_LIFE_MASK) >> __REQ_WRITE_HINT_SHIFT; +} + #endif /* __LINUX_BLK_TYPES_H */ -- 2.7.4 From mboxrd@z Thu Jan 1 00:00:00 1970 From: axboe@kernel.dk (Jens Axboe) Date: Mon, 19 Jun 2017 11:04:55 -0600 Subject: [PATCH 2/9] block: add support for write hints in a bio In-Reply-To: <1497891902-25737-1-git-send-email-axboe@kernel.dk> References: <1497891902-25737-1-git-send-email-axboe@kernel.dk> Message-ID: <1497891902-25737-3-git-send-email-axboe@kernel.dk> No functional changes in this patch, we just set aside 3 bits in the bio/request flags, which can be used to hold a WRITE_LIFE_* life time hint. Ensure that we don't merge requests that have different life time hints assigned to them. Signed-off-by: Jens Axboe --- block/blk-merge.c | 16 ++++++++++++++++ include/linux/blk_types.h | 20 ++++++++++++++++++++ 2 files changed, 36 insertions(+) diff --git a/block/blk-merge.c b/block/blk-merge.c index cea544ec5d96..17cd0c3f872d 100644 --- a/block/blk-merge.c +++ b/block/blk-merge.c @@ -670,6 +670,14 @@ static struct request *attempt_merge(struct request_queue *q, return NULL; /* + * Don't allow merge of different streams, or for a stream with + * non-stream IO. + */ + if ((req->cmd_flags & REQ_WRITE_LIFE_MASK) != + (next->cmd_flags & REQ_WRITE_LIFE_MASK)) + return NULL; + + /* * If we are allowed to merge, then append bio list * from next to rq and release next. merge_requests_fn * will have updated segment counts, update sector @@ -788,6 +796,14 @@ bool blk_rq_merge_ok(struct request *rq, struct bio *bio) !blk_write_same_mergeable(rq->bio, bio)) return false; + /* + * Don't allow merge of different streams, or for a stream with + * non-stream IO. + */ + if ((rq->cmd_flags & REQ_WRITE_LIFE_MASK) != + (bio->bi_opf & REQ_WRITE_LIFE_MASK)) + return false; + return true; } diff --git a/include/linux/blk_types.h b/include/linux/blk_types.h index dcd45b15a3a5..fde216924aa3 100644 --- a/include/linux/blk_types.h +++ b/include/linux/blk_types.h @@ -7,6 +7,7 @@ #include #include +#include struct bio_set; struct bio; @@ -220,6 +221,9 @@ enum req_flag_bits { __REQ_PREFLUSH, /* request for cache flush */ __REQ_RAHEAD, /* read ahead, can fail anytime */ __REQ_BACKGROUND, /* background IO */ + __REQ_WRITE_HINT_SHIFT, /* 3 bits for life time hint */ + __REQ_WRITE_HINT_PAD1, + __REQ_WRITE_HINT_PAD2, /* command specific flags for REQ_OP_WRITE_ZEROES: */ __REQ_NOUNMAP, /* do not free blocks when zeroing */ @@ -240,6 +244,12 @@ enum req_flag_bits { #define REQ_PREFLUSH (1ULL << __REQ_PREFLUSH) #define REQ_RAHEAD (1ULL << __REQ_RAHEAD) #define REQ_BACKGROUND (1ULL << __REQ_BACKGROUND) +#define REQ_WRITE_SHORT (WRITE_LIFE_SHORT << __REQ_WRITE_HINT_SHIFT) +#define REQ_WRITE_MEDIUM (WRITE_LIFE_MEDIUM << __REQ_WRITE_HINT_SHIFT) +#define REQ_WRITE_LONG (WRITE_LIFE_LONG << __REQ_WRITE_HINT_SHIFT) +#define REQ_WRITE_EXTREME (WRITE_LIFE_EXTREME << __REQ_WRITE_HINT_SHIFT) + +#define REQ_WRITE_LIFE_MASK (0x7 << __REQ_WRITE_HINT_SHIFT) #define REQ_NOUNMAP (1ULL << __REQ_NOUNMAP) @@ -331,4 +341,14 @@ struct blk_rq_stat { u64 batch; }; +static inline unsigned int write_hint_to_opf(enum rw_hint hint) +{ + return hint << __REQ_WRITE_HINT_SHIFT; +} + +static inline enum rw_hint opf_to_write_hint(unsigned int opf) +{ + return (opf & REQ_WRITE_LIFE_MASK) >> __REQ_WRITE_HINT_SHIFT; +} + #endif /* __LINUX_BLK_TYPES_H */ -- 2.7.4