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[66.29.164.166]) by smtp.gmail.com with ESMTPSA id f71sm2532627pfd.98.2017.06.14.20.45.27 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Wed, 14 Jun 2017 20:45:28 -0700 (PDT) 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, Jens Axboe Subject: [PATCH 05/11] block: add helpers for setting/checking write hint validity Date: Wed, 14 Jun 2017 21:45:06 -0600 Message-Id: <1497498312-17704-6-git-send-email-axboe@kernel.dk> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1497498312-17704-1-git-send-email-axboe@kernel.dk> References: <1497498312-17704-1-git-send-email-axboe@kernel.dk> Sender: linux-block-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP 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 --- 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 */