diff options
Diffstat (limited to 'include/linux/bio.h')
| -rw-r--r-- | include/linux/bio.h | 69 |
1 files changed, 32 insertions, 37 deletions
diff --git a/include/linux/bio.h b/include/linux/bio.h index 2892b71..5be93f1 100644 --- a/include/linux/bio.h +++ b/include/linux/bio.h @@ -142,56 +142,51 @@ struct bio { * * bit 0 -- data direction * If not set, bio is a read from device. If set, it's a write to device. - * bit 1 -- rw-ahead when set - * bit 2 -- barrier + * bit 1 -- fail fast device errors + * bit 2 -- fail fast transport errors + * bit 3 -- fail fast driver errors + * bit 4 -- rw-ahead when set + * bit 5 -- 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. - * bit 4 -- Unplug the device immediately after submitting this bio. - * bit 5 -- metadata request + * bit 6 -- synchronous I/O hint. + * bit 7 -- Unplug the device immediately after submitting this bio. + * bit 8 -- metadata request * Used for tracing to differentiate metadata and data IO. May also * get some preferential treatment in the IO scheduler - * bit 6 -- discard sectors + * bit 9 -- 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 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 */ -#define BIO_RW_BARRIER 2 -#define BIO_RW_SYNCIO 3 -#define BIO_RW_UNPLUG 4 -#define BIO_RW_META 5 -#define BIO_RW_DISCARD 6 -#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))) +enum bio_rw_flags { + BIO_RW, + BIO_RW_FAILFAST_DEV, + BIO_RW_FAILFAST_TRANSPORT, + BIO_RW_FAILFAST_DRIVER, + /* above flags must match REQ_* */ + BIO_RW_AHEAD, + BIO_RW_BARRIER, + BIO_RW_SYNCIO, + BIO_RW_UNPLUG, + BIO_RW_META, + BIO_RW_DISCARD, + BIO_RW_NOIDLE, +}; /* - * Old defines, these should eventually be replaced by direct usage of - * bio_rw_flagged() + * First four bits must match between bio->bi_rw and rq->cmd_flags, make + * that explicit here. */ -#define bio_barrier(bio) bio_rw_flagged(bio, BIO_RW_BARRIER) -#define bio_sync(bio) bio_rw_flagged(bio, BIO_RW_SYNCIO) -#define bio_unplug(bio) bio_rw_flagged(bio, BIO_RW_UNPLUG) -#define bio_failfast_dev(bio) bio_rw_flagged(bio, BIO_RW_FAILFAST_DEV) -#define bio_failfast_transport(bio) \ - bio_rw_flagged(bio, BIO_RW_FAILFAST_TRANSPORT) -#define bio_failfast_driver(bio) \ - bio_rw_flagged(bio, BIO_RW_FAILFAST_DRIVER) -#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) +#define BIO_RW_RQ_MASK 0xf + +static inline bool bio_rw_flagged(struct bio *bio, enum bio_rw_flags flag) +{ + return (bio->bi_rw & (1 << flag)) != 0; +} /* * upper 16 bits of bi_rw define the io priority of this bio @@ -216,7 +211,7 @@ struct bio { #define bio_offset(bio) bio_iovec((bio))->bv_offset #define bio_segments(bio) ((bio)->bi_vcnt - (bio)->bi_idx) #define bio_sectors(bio) ((bio)->bi_size >> 9) -#define bio_empty_barrier(bio) (bio_barrier(bio) && !bio_has_data(bio) && !bio_discard(bio)) +#define bio_empty_barrier(bio) (bio_rw_flagged(bio, BIO_RW_BARRIER) && !bio_has_data(bio) && !bio_rw_flagged(bio, BIO_RW_DISCARD)) static inline unsigned int bio_cur_bytes(struct bio *bio) { |