diff options
| -rw-r--r-- | block/blk-core.c | 2 | ||||
| -rw-r--r-- | block/cfq-iosched.c | 4 | ||||
| -rw-r--r-- | fs/direct-io.c | 2 | ||||
| -rw-r--r-- | include/linux/bio.h | 19 | ||||
| -rw-r--r-- | include/linux/blkdev.h | 3 | ||||
| -rw-r--r-- | include/linux/fs.h | 9 |
6 files changed, 25 insertions, 14 deletions
diff --git a/block/blk-core.c b/block/blk-core.c index c4198f083e5b..25572802dac2 100644 --- a/block/blk-core.c +++ b/block/blk-core.c @@ -1128,6 +1128,8 @@ void init_request_from_bio(struct request *req, struct bio *bio) req->cmd_flags |= REQ_UNPLUG; if (bio_rw_meta(bio)) req->cmd_flags |= REQ_RW_META; + if (bio_noidle(bio)) + req->cmd_flags |= REQ_NOIDLE; req->errors = 0; req->hard_sector = req->sector = bio->bi_sector; diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c index 664ebfd092ec..9e809345f71a 100644 --- a/block/cfq-iosched.c +++ b/block/cfq-iosched.c @@ -1992,8 +1992,10 @@ static void cfq_completed_request(struct request_queue *q, struct request *rq) } if (cfq_slice_used(cfqq) || cfq_class_idle(cfqq)) cfq_slice_expired(cfqd, 1); - else if (sync && RB_EMPTY_ROOT(&cfqq->sort_list)) + else if (sync && !rq_noidle(rq) && + RB_EMPTY_ROOT(&cfqq->sort_list)) { cfq_arm_slice_timer(cfqd); + } } if (!cfqd->rq_in_driver) diff --git a/fs/direct-io.c b/fs/direct-io.c index b6d43908ff7a..da258e7249cc 100644 --- a/fs/direct-io.c +++ b/fs/direct-io.c @@ -1126,7 +1126,7 @@ __blockdev_direct_IO(int rw, struct kiocb *iocb, struct inode *inode, int acquire_i_mutex = 0; if (rw & WRITE) - rw = WRITE_SYNC; + rw = WRITE_ODIRECT; if (bdev) bdev_blkbits = blksize_bits(bdev_hardsect_size(bdev)); diff --git a/include/linux/bio.h b/include/linux/bio.h index b05b1d4d17d2..b900d2c67d29 100644 --- a/include/linux/bio.h +++ b/include/linux/bio.h @@ -145,20 +145,21 @@ struct bio { * bit 2 -- barrier * Insert a serialization point in the IO queue, forcing previously * submitted IO to be completed before this one is issued. - * bit 3 -- synchronous I/O hint: the block layer will unplug immediately - * Note that this does NOT indicate that the IO itself is sync, just - * that the block layer will not postpone issue of this IO by plugging. - * bit 4 -- metadata request + * bit 3 -- synchronous I/O hint. + * bit 4 -- Unplug the device immediately after submitting this bio. + * bit 5 -- metadata request * Used for tracing to differentiate metadata and data IO. May also * get some preferential treatment in the IO scheduler - * bit 5 -- discard sectors + * bit 6 -- discard sectors * Informs the lower level device that this range of sectors is no longer * used by the file system and may thus be freed by the device. Used * for flash based storage. - * bit 6 -- fail fast device errors - * bit 7 -- fail fast transport errors - * bit 8 -- fail fast driver errors + * bit 7 -- fail fast device errors + * bit 8 -- fail fast transport errors + * bit 9 -- fail fast driver errors * Don't want driver retries for any fast fail whatever the reason. + * bit 10 -- Tell the IO scheduler not to wait for more requests after this + one has been submitted, even if it is a SYNC request. */ #define BIO_RW 0 /* Must match RW in req flags (blkdev.h) */ #define BIO_RW_AHEAD 1 /* Must match FAILFAST in req flags */ @@ -170,6 +171,7 @@ struct bio { #define BIO_RW_FAILFAST_DEV 7 #define BIO_RW_FAILFAST_TRANSPORT 8 #define BIO_RW_FAILFAST_DRIVER 9 +#define BIO_RW_NOIDLE 10 #define bio_rw_flagged(bio, flag) ((bio)->bi_rw & (1 << (flag))) @@ -188,6 +190,7 @@ struct bio { #define bio_rw_ahead(bio) bio_rw_flagged(bio, BIO_RW_AHEAD) #define bio_rw_meta(bio) bio_rw_flagged(bio, BIO_RW_META) #define bio_discard(bio) bio_rw_flagged(bio, BIO_RW_DISCARD) +#define bio_noidle(bio) bio_rw_flagged(bio, BIO_RW_NOIDLE) /* * upper 16 bits of bi_rw define the io priority of this bio diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index 67dae3bd881c..e03660964e02 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -118,6 +118,7 @@ enum rq_flag_bits { __REQ_COPY_USER, /* contains copies of user pages */ __REQ_INTEGRITY, /* integrity metadata has been remapped */ __REQ_UNPLUG, /* unplug queue on submission */ + __REQ_NOIDLE, /* Don't anticipate more IO after this one */ __REQ_NR_BITS, /* stops here */ }; @@ -145,6 +146,7 @@ enum rq_flag_bits { #define REQ_COPY_USER (1 << __REQ_COPY_USER) #define REQ_INTEGRITY (1 << __REQ_INTEGRITY) #define REQ_UNPLUG (1 << __REQ_UNPLUG) +#define REQ_NOIDLE (1 << __REQ_NOIDLE) #define BLK_MAX_CDB 16 @@ -633,6 +635,7 @@ static inline bool rq_is_sync(struct request *rq) } #define rq_is_meta(rq) ((rq)->cmd_flags & REQ_RW_META) +#define rq_noidle(rq) ((rq)->cmd_flags & REQ_NOIDLE) static inline int blk_queue_full(struct request_queue *q, int sync) { diff --git a/include/linux/fs.h b/include/linux/fs.h index ea0510978f76..cae5720f431c 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -95,11 +95,12 @@ struct inodes_stat_t { #define SWRITE 3 /* for ll_rw_block() - wait for buffer lock */ #define READ_SYNC (READ | (1 << BIO_RW_SYNCIO) | (1 << BIO_RW_UNPLUG)) #define READ_META (READ | (1 << BIO_RW_META)) -#define WRITE_SYNC (WRITE | (1 << BIO_RW_SYNCIO) | (1 << BIO_RW_UNPLUG)) -#define WRITE_SYNC_PLUG (WRITE | (1 << BIO_RW_SYNCIO)) -#define SWRITE_SYNC (SWRITE | (1 << BIO_RW_SYNCIO) | (1 << BIO_RW_UNPLUG)) +#define WRITE_SYNC_PLUG (WRITE | (1 << BIO_RW_SYNCIO) | (1 << BIO_RW_NOIDLE)) +#define WRITE_SYNC (WRITE_SYNC_PLUG | (1 << BIO_RW_UNPLUG)) +#define WRITE_ODIRECT (WRITE | (1 << BIO_RW_SYNCIO) | (1 << BIO_RW_UNPLUG)) #define SWRITE_SYNC_PLUG \ - (SWRITE | (1 << BIO_RW_SYNCIO)) + (SWRITE | (1 << BIO_RW_SYNCIO) | (1 << BIO_RW_NOIDLE)) +#define SWRITE_SYNC (SWRITE_SYNC_PLUG | (1 << BIO_RW_UNPLUG)) #define WRITE_BARRIER (WRITE | (1 << BIO_RW_BARRIER)) #define DISCARD_NOBARRIER (1 << BIO_RW_DISCARD) #define DISCARD_BARRIER ((1 << BIO_RW_DISCARD) | (1 << BIO_RW_BARRIER)) |