+++ /dev/null
-/*
- * 2.5 block I/O model
- *
- * Copyright (C) 2001 Jens Axboe <axboe@suse.de>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- *
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public Licens
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-
- */
-#ifndef __LINUX_BIO_H
-#define __LINUX_BIO_H
-
-#include <linux/mempool.h>
-#include <linux/bug.h>
-#include <linux/err.h>
-
-#include <linux/blkdev.h>
-#include <linux/blk_types.h>
-#include <linux/workqueue.h>
-
-#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))
-
-#define bio_iter_page(bio, iter) \
- bvec_iter_page((bio)->bi_io_vec, (iter))
-#define bio_iter_len(bio, iter) \
- bvec_iter_len((bio)->bi_io_vec, (iter))
-#define bio_iter_offset(bio, iter) \
- bvec_iter_offset((bio)->bi_io_vec, (iter))
-
-#define bio_page(bio) bio_iter_page((bio), (bio)->bi_iter)
-#define bio_offset(bio) bio_iter_offset((bio), (bio)->bi_iter)
-#define bio_iovec(bio) bio_iter_iovec((bio), (bio)->bi_iter)
-
-#define bio_multiple_segments(bio) \
- ((bio)->bi_iter.bi_size != bio_iovec(bio).bv_len)
-
-#define bvec_iter_sectors(iter) ((iter).bi_size >> 9)
-#define bvec_iter_end_sector(iter) ((iter).bi_sector + bvec_iter_sectors((iter)))
-
-#define bio_sectors(bio) bvec_iter_sectors((bio)->bi_iter)
-#define bio_end_sector(bio) bvec_iter_end_sector((bio)->bi_iter)
-
-static inline bool bio_has_data(struct bio *bio)
-{
- if (bio &&
- bio->bi_iter.bi_size &&
- 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_no_advance_iter(bio))
- return false;
-
- return true;
-}
-
-static inline bool bio_mergeable(struct bio *bio)
-{
- if (bio->bi_opf & REQ_NOMERGE_FLAGS)
- return false;
-
- return true;
-}
-
-static inline unsigned int bio_cur_bytes(struct bio *bio)
-{
- if (bio_has_data(bio))
- return bio_iovec(bio).bv_len;
- else /* dataless requests such as discard */
- return bio->bi_iter.bi_size;
-}
-
-static inline void *bio_data(struct bio *bio)
-{
- if (bio_has_data(bio))
- return page_address(bio_page(bio)) + bio_offset(bio);
-
- return NULL;
-}
-
-#define __bio_kmap_atomic(bio, iter) \
- (kmap_atomic(bio_iter_iovec((bio), (iter)).bv_page) + \
- bio_iter_iovec((bio), (iter)).bv_offset)
-
-#define __bio_kunmap_atomic(addr) kunmap_atomic(addr)
-
-static inline struct bio_vec *bio_next_segment(const struct bio *bio,
- struct bvec_iter_all *iter)
-{
- if (iter->idx >= bio->bi_vcnt)
- return NULL;
-
- return &bio->bi_io_vec[iter->idx];
-}
-
-#define bio_for_each_segment_all(bvl, bio, iter) \
- for ((iter).idx = 0; (bvl = bio_next_segment((bio), &(iter))); (iter).idx++)
-
-static inline void bio_advance_iter(struct bio *bio, struct bvec_iter *iter,
- unsigned bytes)
-{
- iter->bi_sector += bytes >> 9;
-
- if (bio_no_advance_iter(bio))
- iter->bi_size -= bytes;
- else
- bvec_iter_advance(bio->bi_io_vec, iter, bytes);
-}
-
-#define __bio_for_each_segment(bvl, bio, iter, start) \
- for (iter = (start); \
- (iter).bi_size && \
- ((bvl = bio_iter_iovec((bio), (iter))), 1); \
- bio_advance_iter((bio), &(iter), (bvl).bv_len))
-
-#define bio_for_each_segment(bvl, bio, iter) \
- __bio_for_each_segment(bvl, bio, iter, (bio)->bi_iter)
-
-#define __bio_for_each_bvec(bvl, bio, iter, start) \
- __bio_for_each_segment(bvl, bio, iter, start)
-
-#define bio_iter_last(bvec, iter) ((iter).bi_size == (bvec).bv_len)
-
-static inline unsigned bio_segments(struct bio *bio)
-{
- unsigned segs = 0;
- struct bio_vec bv;
- struct bvec_iter iter;
-
- /*
- * We special case discard/write same, because they interpret bi_size
- * differently:
- */
-
- if (bio_op(bio) == REQ_OP_DISCARD)
- return 1;
-
- 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)
- segs++;
-
- return segs;
-}
-
-static inline void bio_get(struct bio *bio)
-{
- bio->bi_flags |= (1 << BIO_REFFED);
- smp_mb__before_atomic();
- atomic_inc(&bio->__bi_cnt);
-}
-
-static inline bool bio_flagged(struct bio *bio, unsigned int bit)
-{
- return (bio->bi_flags & (1U << bit)) != 0;
-}
-
-static inline void bio_set_flag(struct bio *bio, unsigned int bit)
-{
- bio->bi_flags |= (1U << bit);
-}
-
-static inline void bio_clear_flag(struct bio *bio, unsigned int bit)
-{
- bio->bi_flags &= ~(1U << bit);
-}
-
-extern struct bio *bio_split(struct bio *bio, int sectors,
- gfp_t gfp, struct bio_set *bs);
-
-static inline struct bio *bio_next_split(struct bio *bio, int sectors,
- gfp_t gfp, struct bio_set *bs)
-{
- if (sectors >= bio_sectors(bio))
- return bio;
-
- return bio_split(bio, sectors, gfp, bs);
-}
-
-struct bio_set {
- unsigned int front_pad;
- unsigned int back_pad;
- mempool_t bio_pool;
- mempool_t bvec_pool;
-};
-
-
-static inline void bioset_free(struct bio_set *bs)
-{
- kfree(bs);
-}
-
-void bioset_exit(struct bio_set *);
-int bioset_init(struct bio_set *, unsigned, unsigned, int);
-
-extern struct bio_set *bioset_create(unsigned int, unsigned int);
-extern struct bio_set *bioset_create_nobvec(unsigned int, unsigned int);
-enum {
- BIOSET_NEED_BVECS = 1 << 0,
- BIOSET_NEED_RESCUER = 1 << 1,
-};
-
-struct bio *bio_alloc_bioset(struct block_device *, unsigned,
- blk_opf_t, gfp_t, struct bio_set *);
-extern void bio_put(struct bio *);
-
-int bio_add_page(struct bio *, struct page *, unsigned, unsigned);
-
-struct bio *bio_alloc_clone(struct block_device *, struct bio *,
- gfp_t, struct bio_set *);
-
-struct bio *bio_kmalloc(unsigned int, gfp_t);
-
-extern void bio_endio(struct bio *);
-
-extern void bio_advance(struct bio *, unsigned);
-
-extern void bio_reset(struct bio *, struct block_device *, unsigned);
-void bio_chain(struct bio *, struct bio *);
-
-extern void bio_copy_data_iter(struct bio *dst, struct bvec_iter *dst_iter,
- struct bio *src, struct bvec_iter *src_iter);
-extern void bio_copy_data(struct bio *dst, struct bio *src);
-
-void bio_free_pages(struct bio *bio);
-
-void zero_fill_bio_iter(struct bio *bio, struct bvec_iter iter);
-
-static inline void zero_fill_bio(struct bio *bio)
-{
- zero_fill_bio_iter(bio, bio->bi_iter);
-}
-
-#define bio_set_dev(bio, bdev) \
-do { \
- (bio)->bi_bdev = (bdev); \
-} while (0)
-
-#define bio_copy_dev(dst, src) \
-do { \
- (dst)->bi_bdev = (src)->bi_bdev; \
-} while (0)
-
-static inline char *bvec_kmap_irq(struct bio_vec *bvec, unsigned long *flags)
-{
- return page_address(bvec->bv_page) + bvec->bv_offset;
-}
-
-static inline void bvec_kunmap_irq(char *buffer, unsigned long *flags)
-{
- *flags = 0;
-}
-
-static inline char *__bio_kmap_irq(struct bio *bio, struct bvec_iter iter,
- unsigned long *flags)
-{
- return bvec_kmap_irq(&bio_iter_iovec(bio, iter), flags);
-}
-#define __bio_kunmap_irq(buf, flags) bvec_kunmap_irq(buf, flags)
-
-#define bio_kmap_irq(bio, flags) \
- __bio_kmap_irq((bio), (bio)->bi_iter, (flags))
-#define bio_kunmap_irq(buf,flags) __bio_kunmap_irq(buf, flags)
-
-struct bio_list {
- struct bio *head;
- struct bio *tail;
-};
-
-static inline int bio_list_empty(const struct bio_list *bl)
-{
- return bl->head == NULL;
-}
-
-static inline void bio_list_init(struct bio_list *bl)
-{
- bl->head = bl->tail = NULL;
-}
-
-#define BIO_EMPTY_LIST { NULL, NULL }
-
-#define bio_list_for_each(bio, bl) \
- for (bio = (bl)->head; bio; bio = bio->bi_next)
-
-static inline unsigned bio_list_size(const struct bio_list *bl)
-{
- unsigned sz = 0;
- struct bio *bio;
-
- bio_list_for_each(bio, bl)
- sz++;
-
- return sz;
-}
-
-static inline void bio_list_add(struct bio_list *bl, struct bio *bio)
-{
- bio->bi_next = NULL;
-
- if (bl->tail)
- bl->tail->bi_next = bio;
- else
- bl->head = bio;
-
- bl->tail = bio;
-}
-
-static inline void bio_list_add_head(struct bio_list *bl, struct bio *bio)
-{
- bio->bi_next = bl->head;
-
- bl->head = bio;
-
- if (!bl->tail)
- bl->tail = bio;
-}
-
-static inline void bio_list_merge(struct bio_list *bl, struct bio_list *bl2)
-{
- if (!bl2->head)
- return;
-
- if (bl->tail)
- bl->tail->bi_next = bl2->head;
- else
- bl->head = bl2->head;
-
- bl->tail = bl2->tail;
-}
-
-static inline void bio_list_merge_head(struct bio_list *bl,
- struct bio_list *bl2)
-{
- if (!bl2->head)
- return;
-
- if (bl->head)
- bl2->tail->bi_next = bl->head;
- else
- bl->tail = bl2->tail;
-
- bl->head = bl2->head;
-}
-
-static inline struct bio *bio_list_peek(struct bio_list *bl)
-{
- return bl->head;
-}
-
-static inline struct bio *bio_list_pop(struct bio_list *bl)
-{
- struct bio *bio = bl->head;
-
- if (bio) {
- bl->head = bl->head->bi_next;
- if (!bl->head)
- bl->tail = NULL;
-
- bio->bi_next = NULL;
- }
-
- return bio;
-}
-
-static inline struct bio *bio_list_get(struct bio_list *bl)
-{
- struct bio *bio = bl->head;
-
- bl->head = bl->tail = NULL;
-
- return bio;
-}
-
-/*
- * 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);
-}
-
-static inline void bio_init(struct bio *bio,
- struct block_device *bdev,
- struct bio_vec *table,
- unsigned short max_vecs,
- unsigned int opf)
-{
- memset(bio, 0, sizeof(*bio));
- bio->bi_bdev = bdev;
- bio->bi_opf = opf;
- atomic_set(&bio->__bi_remaining, 1);
- atomic_set(&bio->__bi_cnt, 1);
-
- bio->bi_io_vec = table;
- bio->bi_max_vecs = max_vecs;
-}
-
-#endif /* __LINUX_BIO_H */
projects / bcachefs-tools-debian / blobdiff