diff options
Diffstat (limited to 'include/linux/bio.h')
| -rw-r--r-- | include/linux/bio.h | 109 |
1 files changed, 35 insertions, 74 deletions
diff --git a/include/linux/bio.h b/include/linux/bio.h index 6b7481f62218..23ddf4b46a9b 100644 --- a/include/linux/bio.h +++ b/include/linux/bio.h @@ -41,44 +41,9 @@ #endif #define BIO_MAX_PAGES 256 -#define BIO_MAX_SIZE (BIO_MAX_PAGES << PAGE_SHIFT) -#define BIO_MAX_SECTORS (BIO_MAX_SIZE >> 9) -/* - * upper 16 bits of bi_rw define the io priority of this bio - */ -#define BIO_PRIO_SHIFT (8 * sizeof(unsigned long) - IOPRIO_BITS) -#define bio_prio(bio) ((bio)->bi_rw >> BIO_PRIO_SHIFT) -#define bio_prio_valid(bio) ioprio_valid(bio_prio(bio)) - -#define bio_set_prio(bio, prio) do { \ - WARN_ON(prio >= (1 << IOPRIO_BITS)); \ - (bio)->bi_rw &= ((1UL << BIO_PRIO_SHIFT) - 1); \ - (bio)->bi_rw |= ((unsigned long) (prio) << BIO_PRIO_SHIFT); \ -} while (0) - -/* - * various member access, note that bio_data should of course not be used - * on highmem page vectors - */ -#define __bvec_iter_bvec(bvec, iter) (&(bvec)[(iter).bi_idx]) - -#define bvec_iter_page(bvec, iter) \ - (__bvec_iter_bvec((bvec), (iter))->bv_page) - -#define bvec_iter_len(bvec, iter) \ - min((iter).bi_size, \ - __bvec_iter_bvec((bvec), (iter))->bv_len - (iter).bi_bvec_done) - -#define bvec_iter_offset(bvec, iter) \ - (__bvec_iter_bvec((bvec), (iter))->bv_offset + (iter).bi_bvec_done) - -#define bvec_iter_bvec(bvec, iter) \ -((struct bio_vec) { \ - .bv_page = bvec_iter_page((bvec), (iter)), \ - .bv_len = bvec_iter_len((bvec), (iter)), \ - .bv_offset = bvec_iter_offset((bvec), (iter)), \ -}) +#define bio_prio(bio) (bio)->bi_ioprio +#define bio_set_prio(bio, prio) ((bio)->bi_ioprio = prio) #define bio_iter_iovec(bio, iter) \ bvec_iter_bvec((bio)->bi_io_vec, (iter)) @@ -106,18 +71,26 @@ static inline bool bio_has_data(struct bio *bio) { if (bio && bio->bi_iter.bi_size && - !(bio->bi_rw & REQ_DISCARD)) + bio_op(bio) != REQ_OP_DISCARD && + bio_op(bio) != REQ_OP_SECURE_ERASE) return true; return false; } +static inline bool bio_no_advance_iter(struct bio *bio) +{ + return bio_op(bio) == REQ_OP_DISCARD || + bio_op(bio) == REQ_OP_SECURE_ERASE || + bio_op(bio) == REQ_OP_WRITE_SAME; +} + static inline bool bio_is_rw(struct bio *bio) { if (!bio_has_data(bio)) return false; - if (bio->bi_rw & BIO_NO_ADVANCE_ITER_MASK) + if (bio_no_advance_iter(bio)) return false; return true; @@ -125,7 +98,7 @@ static inline bool bio_is_rw(struct bio *bio) static inline bool bio_mergeable(struct bio *bio) { - if (bio->bi_rw & REQ_NOMERGE_FLAGS) + if (bio->bi_opf & REQ_NOMERGE_FLAGS) return false; return true; @@ -193,39 +166,12 @@ static inline void *bio_data(struct bio *bio) #define bio_for_each_segment_all(bvl, bio, i) \ for (i = 0, bvl = (bio)->bi_io_vec; i < (bio)->bi_vcnt; i++, bvl++) -static inline void bvec_iter_advance(struct bio_vec *bv, struct bvec_iter *iter, - unsigned bytes) -{ - WARN_ONCE(bytes > iter->bi_size, - "Attempted to advance past end of bvec iter\n"); - - while (bytes) { - unsigned len = min(bytes, bvec_iter_len(bv, *iter)); - - bytes -= len; - iter->bi_size -= len; - iter->bi_bvec_done += len; - - if (iter->bi_bvec_done == __bvec_iter_bvec(bv, *iter)->bv_len) { - iter->bi_bvec_done = 0; - iter->bi_idx++; - } - } -} - -#define for_each_bvec(bvl, bio_vec, iter, start) \ - for (iter = (start); \ - (iter).bi_size && \ - ((bvl = bvec_iter_bvec((bio_vec), (iter))), 1); \ - bvec_iter_advance((bio_vec), &(iter), (bvl).bv_len)) - - static inline void bio_advance_iter(struct bio *bio, struct bvec_iter *iter, unsigned bytes) { iter->bi_sector += bytes >> 9; - if (bio->bi_rw & BIO_NO_ADVANCE_ITER_MASK) + if (bio_no_advance_iter(bio)) iter->bi_size -= bytes; else bvec_iter_advance(bio->bi_io_vec, iter, bytes); @@ -253,10 +199,13 @@ static inline unsigned bio_segments(struct bio *bio) * differently: */ - if (bio->bi_rw & REQ_DISCARD) + if (bio_op(bio) == REQ_OP_DISCARD) return 1; - if (bio->bi_rw & REQ_WRITE_SAME) + if (bio_op(bio) == REQ_OP_SECURE_ERASE) + return 1; + + if (bio_op(bio) == REQ_OP_WRITE_SAME) return 1; bio_for_each_segment(bv, bio, iter) @@ -375,7 +324,7 @@ struct bio_integrity_payload { static inline struct bio_integrity_payload *bio_integrity(struct bio *bio) { - if (bio->bi_rw & REQ_INTEGRITY) + if (bio->bi_opf & REQ_INTEGRITY) return bio->bi_integrity; return NULL; @@ -473,7 +422,7 @@ static inline void bio_io_error(struct bio *bio) struct request_queue; extern int bio_phys_segments(struct request_queue *, struct bio *); -extern int submit_bio_wait(int rw, struct bio *bio); +extern int submit_bio_wait(struct bio *bio); extern void bio_advance(struct bio *, unsigned); extern void bio_init(struct bio *); @@ -527,11 +476,14 @@ extern unsigned int bvec_nr_vecs(unsigned short idx); int bio_associate_blkcg(struct bio *bio, struct cgroup_subsys_state *blkcg_css); int bio_associate_current(struct bio *bio); void bio_disassociate_task(struct bio *bio); +void bio_clone_blkcg_association(struct bio *dst, struct bio *src); #else /* CONFIG_BLK_CGROUP */ static inline int bio_associate_blkcg(struct bio *bio, struct cgroup_subsys_state *blkcg_css) { return 0; } static inline int bio_associate_current(struct bio *bio) { return -ENOENT; } static inline void bio_disassociate_task(struct bio *bio) { } +static inline void bio_clone_blkcg_association(struct bio *dst, + struct bio *src) { } #endif /* CONFIG_BLK_CGROUP */ #ifdef CONFIG_HIGHMEM @@ -703,14 +655,23 @@ static inline struct bio *bio_list_get(struct bio_list *bl) } /* + * Increment chain count for the bio. Make sure the CHAIN flag update + * is visible before the raised count. + */ +static inline void bio_inc_remaining(struct bio *bio) +{ + bio_set_flag(bio, BIO_CHAIN); + smp_mb__before_atomic(); + atomic_inc(&bio->__bi_remaining); +} + +/* * bio_set is used to allow other portions of the IO system to * allocate their own private memory pools for bio and iovec structures. * These memory pools in turn all allocate from the bio_slab * and the bvec_slabs[]. */ #define BIO_POOL_SIZE 2 -#define BIOVEC_NR_POOLS 6 -#define BIOVEC_MAX_IDX (BIOVEC_NR_POOLS - 1) struct bio_set { struct kmem_cache *bio_slab; |