cregit-Linux how code gets into the kernel

Release 4.16 include/linux/bio.h

Directory: include/linux
/*
 * 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/highmem.h>
#include <linux/mempool.h>
#include <linux/ioprio.h>
#include <linux/bug.h>

#ifdef CONFIG_BLOCK

#include <asm/io.h>

/* struct bio, bio_vec and BIO_* flags are defined in blk_types.h */
#include <linux/blk_types.h>


#define BIO_DEBUG

#ifdef BIO_DEBUG

#define BIO_BUG_ON	BUG_ON
#else

#define BIO_BUG_ON
#endif

#ifdef CONFIG_THP_SWAP
#if HPAGE_PMD_NR > 256

#define BIO_MAX_PAGES		HPAGE_PMD_NR
#else

#define BIO_MAX_PAGES		256
#endif
#else

#define BIO_MAX_PAGES		256
#endif


#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 bio_sectors(bio)	((bio)->bi_iter.bi_size >> 9)

#define bio_end_sector(bio)	((bio)->bi_iter.bi_sector + bio_sectors((bio)))

/*
 * Return the data direction, READ or WRITE.
 */

#define bio_data_dir(bio) \
	(op_is_write(bio_op(bio)) ? WRITE : READ)

/*
 * Check whether this bio carries any data or not. A NULL bio is allowed.
 */

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 && bio_op(bio) != REQ_OP_WRITE_ZEROES) return true; return false; }

Contributors

PersonTokensPropCommitsCommitProp
Kent Overstreet3061.22%125.00%
Adrian Hunter714.29%125.00%
Chaitanya Kulkarni714.29%125.00%
Michael Christie510.20%125.00%
Total49100.00%4100.00%


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 || bio_op(bio) == REQ_OP_WRITE_ZEROES; }

Contributors

PersonTokensPropCommitsCommitProp
Michael Christie2765.85%133.33%
Adrian Hunter717.07%133.33%
Chaitanya Kulkarni717.07%133.33%
Total41100.00%3100.00%


static inline bool bio_mergeable(struct bio *bio) { if (bio->bi_opf & REQ_NOMERGE_FLAGS) return false; return true; }

Contributors

PersonTokensPropCommitsCommitProp
Kent Overstreet2596.15%150.00%
Jens Axboe13.85%150.00%
Total26100.00%2100.00%


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; }

Contributors

PersonTokensPropCommitsCommitProp
Jens Axboe2567.57%116.67%
Kent Overstreet616.22%350.00%
David Woodhouse513.51%116.67%
Tejun Heo12.70%116.67%
Total37100.00%6100.00%


static inline void *bio_data(struct bio *bio) { if (bio_has_data(bio)) return page_address(bio_page(bio)) + bio_offset(bio); return NULL; }

Contributors

PersonTokensPropCommitsCommitProp
Jens Axboe3491.89%150.00%
Kent Overstreet38.11%150.00%
Total37100.00%2100.00%

/* * will die */ #define bvec_to_phys(bv) (page_to_phys((bv)->bv_page) + (unsigned long) (bv)->bv_offset) /* * merge helpers etc */ /* Default implementation of BIOVEC_PHYS_MERGEABLE */ #define __BIOVEC_PHYS_MERGEABLE(vec1, vec2) \ ((bvec_to_phys((vec1)) + (vec1)->bv_len) == bvec_to_phys((vec2))) /* * allow arch override, for eg virtualized architectures (put in asm/io.h) */ #ifndef BIOVEC_PHYS_MERGEABLE #define BIOVEC_PHYS_MERGEABLE(vec1, vec2) \ __BIOVEC_PHYS_MERGEABLE(vec1, vec2) #endif #define __BIO_SEG_BOUNDARY(addr1, addr2, mask) \ (((addr1) | (mask)) == (((addr2) - 1) | (mask))) #define BIOVEC_SEG_BOUNDARY(q, b1, b2) \ __BIO_SEG_BOUNDARY(bvec_to_phys((b1)), bvec_to_phys((b2)) + (b2)->bv_len, queue_segment_boundary((q))) /* * drivers should _never_ use the all version - the bio may have been split * before it got to the driver and the driver won't own all of it */ #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 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; iter->bi_done += bytes; } else { bvec_iter_advance(bio->bi_io_vec, iter, bytes); /* TODO: It is reasonable to complete bio with error here. */ } }

Contributors

PersonTokensPropCommitsCommitProp
Kent Overstreet5078.12%125.00%
Dmitriy Monakhov1117.19%250.00%
Michael Christie34.69%125.00%
Total64100.00%4100.00%


static inline bool bio_rewind_iter(struct bio *bio, struct bvec_iter *iter, unsigned int bytes) { iter->bi_sector -= bytes >> 9; if (bio_no_advance_iter(bio)) { iter->bi_size += bytes; iter->bi_done -= bytes; return true; } return bvec_iter_rewind(bio->bi_io_vec, iter, bytes); }

Contributors

PersonTokensPropCommitsCommitProp
Dmitriy Monakhov65100.00%1100.00%
Total65100.00%1100.00%

#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_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/write zeroes, because they * interpret bi_size differently: */ switch (bio_op(bio)) { case REQ_OP_DISCARD: case REQ_OP_SECURE_ERASE: case REQ_OP_WRITE_ZEROES: return 0; case REQ_OP_WRITE_SAME: return 1; default: break; } bio_for_each_segment(bv, bio, iter) segs++; return segs; }

Contributors

PersonTokensPropCommitsCommitProp
Kent Overstreet4362.32%228.57%
Chaitanya Kulkarni1521.74%114.29%
Christoph Hellwig57.25%114.29%
Michael Christie34.35%114.29%
Shaohua Li22.90%114.29%
Adrian Hunter11.45%114.29%
Total69100.00%7100.00%

/* * get a reference to a bio, so it won't disappear. the intended use is * something like: * * bio_get(bio); * submit_bio(rw, bio); * if (bio->bi_flags ...) * do_something * bio_put(bio); * * without the bio_get(), it could potentially complete I/O before submit_bio * returns. and then bio would be freed memory when if (bio->bi_flags ...) * runs */
static inline void bio_get(struct bio *bio) { bio->bi_flags |= (1 << BIO_REFFED); smp_mb__before_atomic(); atomic_inc(&bio->__bi_cnt); }

Contributors

PersonTokensPropCommitsCommitProp
Jens Axboe2987.88%150.00%
Linus Torvalds412.12%150.00%
Total33100.00%2100.00%


static inline void bio_cnt_set(struct bio *bio, unsigned int count) { if (count != 1) { bio->bi_flags |= (1 << BIO_REFFED); smp_mb__before_atomic(); } atomic_set(&bio->__bi_cnt, count); }

Contributors

PersonTokensPropCommitsCommitProp
Jens Axboe47100.00%1100.00%
Total47100.00%1100.00%


static inline bool bio_flagged(struct bio *bio, unsigned int bit) { return (bio->bi_flags & (1U << bit)) != 0; }

Contributors

PersonTokensPropCommitsCommitProp
Jens Axboe31100.00%2100.00%
Total31100.00%2100.00%


static inline void bio_set_flag(struct bio *bio, unsigned int bit) { bio->bi_flags |= (1U << bit); }

Contributors

PersonTokensPropCommitsCommitProp
Jens Axboe26100.00%2100.00%
Total26100.00%2100.00%


static inline void bio_clear_flag(struct bio *bio, unsigned int bit) { bio->bi_flags &= ~(1U << bit); }

Contributors

PersonTokensPropCommitsCommitProp
Jens Axboe27100.00%2100.00%
Total27100.00%2100.00%


static inline void bio_get_first_bvec(struct bio *bio, struct bio_vec *bv) { *bv = bio_iovec(bio); }

Contributors

PersonTokensPropCommitsCommitProp
Ming Lei25100.00%1100.00%
Total25100.00%1100.00%


static inline void bio_get_last_bvec(struct bio *bio, struct bio_vec *bv) { struct bvec_iter iter = bio->bi_iter; int idx; if (unlikely(!bio_multiple_segments(bio))) { *bv = bio_iovec(bio); return; } bio_advance_iter(bio, &iter, iter.bi_size); if (!iter.bi_bvec_done) idx = iter.bi_idx - 1; else /* in the middle of bvec */ idx = iter.bi_idx; *bv = bio->bi_io_vec[idx]; /* * iter.bi_bvec_done records actual length of the last bvec * if this bio ends in the middle of one io vector */ if (iter.bi_bvec_done) bv->bv_len = iter.bi_bvec_done; }

Contributors

PersonTokensPropCommitsCommitProp
Ming Lei110100.00%1100.00%
Total110100.00%1100.00%


static inline unsigned bio_pages_all(struct bio *bio) { WARN_ON_ONCE(bio_flagged(bio, BIO_CLONED)); return bio->bi_vcnt; }

Contributors

PersonTokensPropCommitsCommitProp
Ming Lei27100.00%1100.00%
Total27100.00%1100.00%


static inline struct bio_vec *bio_first_bvec_all(struct bio *bio) { WARN_ON_ONCE(bio_flagged(bio, BIO_CLONED)); return bio->bi_io_vec; }

Contributors

PersonTokensPropCommitsCommitProp
Ming Lei29100.00%1100.00%
Total29100.00%1100.00%


static inline struct page *bio_first_page_all(struct bio *bio) { return bio_first_bvec_all(bio)->bv_page; }

Contributors

PersonTokensPropCommitsCommitProp
Ming Lei22100.00%1100.00%
Total22100.00%1100.00%


static inline struct bio_vec *bio_last_bvec_all(struct bio *bio) { WARN_ON_ONCE(bio_flagged(bio, BIO_CLONED)); return &bio->bi_io_vec[bio->bi_vcnt - 1]; }

Contributors

PersonTokensPropCommitsCommitProp
Ming Lei37100.00%1100.00%
Total37100.00%1100.00%

enum bip_flags { BIP_BLOCK_INTEGRITY = 1 << 0, /* block layer owns integrity data */ BIP_MAPPED_INTEGRITY = 1 << 1, /* ref tag has been remapped */ BIP_CTRL_NOCHECK = 1 << 2, /* disable HBA integrity checking */ BIP_DISK_NOCHECK = 1 << 3, /* disable disk integrity checking */ BIP_IP_CHECKSUM = 1 << 4, /* IP checksum */ }; /* * bio integrity payload */ struct bio_integrity_payload { struct bio *bip_bio; /* parent bio */ struct bvec_iter bip_iter; unsigned short bip_slab; /* slab the bip came from */ unsigned short bip_vcnt; /* # of integrity bio_vecs */ unsigned short bip_max_vcnt; /* integrity bio_vec slots */ unsigned short bip_flags; /* control flags */ struct work_struct bip_work; /* I/O completion */ struct bio_vec *bip_vec; struct bio_vec bip_inline_vecs[0];/* embedded bvec array */ }; #if defined(CONFIG_BLK_DEV_INTEGRITY)
static inline struct bio_integrity_payload *bio_integrity(struct bio *bio) { if (bio->bi_opf & REQ_INTEGRITY) return bio->bi_integrity; return NULL; }

Contributors

PersonTokensPropCommitsCommitProp
Keith Busch2996.67%150.00%
Jens Axboe13.33%150.00%
Total30100.00%2100.00%


static inline bool bio_integrity_flagged(struct bio *bio, enum bip_flags flag) { struct bio_integrity_payload *bip = bio_integrity(bio); if (bip) return bip->bip_flags & flag; return false; }

Contributors

PersonTokensPropCommitsCommitProp
Martin K. Petersen40100.00%3100.00%
Total40100.00%3100.00%


static inline sector_t bip_get_seed(struct bio_integrity_payload *bip) { return bip->bip_iter.bi_sector; }

Contributors

PersonTokensPropCommitsCommitProp
Martin K. Petersen19100.00%1100.00%
Total19100.00%1100.00%


static inline void bip_set_seed(struct bio_integrity_payload *bip, sector_t seed) { bip->bip_iter.bi_sector = seed; }

Contributors

PersonTokensPropCommitsCommitProp
Martin K. Petersen23100.00%1100.00%
Total23100.00%1100.00%

#endif /* CONFIG_BLK_DEV_INTEGRITY */ extern void bio_trim(struct bio *bio, int offset, int size); extern struct bio *bio_split(struct bio *bio, int sectors, gfp_t gfp, struct bio_set *bs); /** * bio_next_split - get next @sectors from a bio, splitting if necessary * @bio: bio to split * @sectors: number of sectors to split from the front of @bio * @gfp: gfp mask * @bs: bio set to allocate from * * Returns a bio representing the next @sectors of @bio - if the bio is smaller * than @sectors, returns the original bio unchanged. */
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); }

Contributors

PersonTokensPropCommitsCommitProp
Kent Overstreet49100.00%1100.00%
Total49100.00%1100.00%

extern struct bio_set *bioset_create(unsigned int, unsigned int, int flags); enum { BIOSET_NEED_BVECS = BIT(0), BIOSET_NEED_RESCUER = BIT(1), }; extern void bioset_free(struct bio_set *); extern mempool_t *biovec_create_pool(int pool_entries); extern struct bio *bio_alloc_bioset(gfp_t, unsigned int, struct bio_set *); extern void bio_put(struct bio *); extern void __bio_clone_fast(struct bio *, struct bio *); extern struct bio *bio_clone_fast(struct bio *, gfp_t, struct bio_set *); extern struct bio *bio_clone_bioset(struct bio *, gfp_t, struct bio_set *bs); extern struct bio_set *fs_bio_set;
static inline struct bio *bio_alloc(gfp_t gfp_mask, unsigned int nr_iovecs) { return bio_alloc_bioset(gfp_mask, nr_iovecs, fs_bio_set); }

Contributors

PersonTokensPropCommitsCommitProp
Kent Overstreet1973.08%125.00%
Dave Olien415.38%125.00%
Jens Axboe27.69%125.00%
Al Viro13.85%125.00%
Total26100.00%4100.00%


static inline struct bio *bio_kmalloc(gfp_t gfp_mask, unsigned int nr_iovecs) { return bio_alloc_bioset(gfp_mask, nr_iovecs, NULL); }

Contributors

PersonTokensPropCommitsCommitProp
Kent Overstreet2284.62%150.00%
Linus Torvalds415.38%150.00%
Total26100.00%2100.00%


static inline struct bio *bio_clone_kmalloc(struct bio *bio, gfp_t gfp_mask) { return bio_clone_bioset(bio, gfp_mask, NULL); }

Contributors

PersonTokensPropCommitsCommitProp
Kent Overstreet27100.00%1100.00%
Total27100.00%1100.00%

extern blk_qc_t submit_bio(struct bio *); extern void bio_endio(struct bio *);
static inline void bio_io_error(struct bio *bio) { bio->bi_status = BLK_STS_IOERR; bio_endio(bio); }

Contributors

PersonTokensPropCommitsCommitProp
Christoph Hellwig23100.00%2100.00%
Total23100.00%2100.00%


static inline void bio_wouldblock_error(struct bio *bio) { bio->bi_status = BLK_STS_AGAIN; bio_endio(bio); }

Contributors

PersonTokensPropCommitsCommitProp
Goldwyn Rodrigues1669.57%150.00%
Christoph Hellwig730.43%150.00%
Total23100.00%2100.00%

struct request_queue; extern int bio_phys_segments(struct request_queue *, struct bio *); extern int submit_bio_wait(struct bio *bio); extern void bio_advance(struct bio *, unsigned); extern void bio_init(struct bio *bio, struct bio_vec *table, unsigned short max_vecs); extern void bio_uninit(struct bio *); extern void bio_reset(struct bio *); void bio_chain(struct bio *, struct bio *); extern int bio_add_page(struct bio *, struct page *, unsigned int,unsigned int); extern int bio_add_pc_page(struct request_queue *, struct bio *, struct page *, unsigned int, unsigned int); int bio_iov_iter_get_pages(struct bio *bio, struct iov_iter *iter); struct rq_map_data; extern struct bio *bio_map_user_iov(struct request_queue *, struct iov_iter *, gfp_t); extern void bio_unmap_user(struct bio *); extern struct bio *bio_map_kern(struct request_queue *, void *, unsigned int, gfp_t); 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); void generic_start_io_acct(struct request_queue *q, int rw, unsigned long sectors, struct hd_struct *part); void generic_end_io_acct(struct request_queue *q, int rw, struct hd_struct *part, unsigned long start_time); #ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE # error "You should define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE for your platform" #endif #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE extern void bio_flush_dcache_pages(struct bio *bi); #else
static inline void bio_flush_dcache_pages(struct bio *bi) { }

Contributors

PersonTokensPropCommitsCommitProp
Ilya Loginov11100.00%1100.00%
Total11100.00%1100.00%

#endif extern void bio_copy_data(struct bio *dst, struct bio *src); extern void bio_free_pages(struct bio *bio); extern struct bio *bio_copy_user_iov(struct request_queue *, struct rq_map_data *, struct iov_iter *, gfp_t); extern int bio_uncopy_user(struct bio *); void zero_fill_bio(struct bio *bio); extern struct bio_vec *bvec_alloc(gfp_t, int, unsigned long *, mempool_t *); extern void bvec_free(mempool_t *, struct bio_vec *, unsigned int); extern unsigned int bvec_nr_vecs(unsigned short idx); extern const char *bio_devname(struct bio *bio, char *buffer); #define bio_set_dev(bio, bdev) \ do { \ if ((bio)->bi_disk != (bdev)->bd_disk) \ bio_clear_flag(bio, BIO_THROTTLED);\ (bio)->bi_disk = (bdev)->bd_disk; \ (bio)->bi_partno = (bdev)->bd_partno; \ } while (0) #define bio_copy_dev(dst, src) \ do { \ (dst)->bi_disk = (src)->bi_disk; \ (dst)->bi_partno = (src)->bi_partno; \ } while (0) #define bio_dev(bio) \ disk_devt((bio)->bi_disk) #ifdef CONFIG_BLK_CGROUP int bio_associate_blkcg(struct bio *bio, struct cgroup_subsys_state *blkcg_css); 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; }

Contributors

PersonTokensPropCommitsCommitProp
Tejun Heo20100.00%1100.00%
Total20100.00%1100.00%


static inline void bio_disassociate_task(struct bio *bio) { }

Contributors

PersonTokensPropCommitsCommitProp
Tejun Heo11100.00%1100.00%
Total11100.00%1100.00%


static inline void bio_clone_blkcg_association(struct bio *dst, struct bio *src) { }

Contributors

PersonTokensPropCommitsCommitProp
Paolo Valente16100.00%1100.00%
Total16100.00%1100.00%

#endif /* CONFIG_BLK_CGROUP */ #ifdef CONFIG_HIGHMEM /* * remember never ever reenable interrupts between a bvec_kmap_irq and * bvec_kunmap_irq! */
static inline char *bvec_kmap_irq(struct bio_vec *bvec, unsigned long *flags) { unsigned long addr; /* * might not be a highmem page, but the preempt/irq count * balancing is a lot nicer this way */ local_irq_save(*flags); addr = (unsigned long) kmap_atomic(bvec->bv_page); BUG_ON(addr & ~PAGE_MASK); return (char *) addr + bvec->bv_offset; }

Contributors

PersonTokensPropCommitsCommitProp
Andrew Morton4980.33%342.86%
Jens Axboe1016.39%228.57%
Alberto Bertogli11.64%114.29%
Adrian Bunk11.64%114.29%
Total61100.00%7100.00%


static inline void bvec_kunmap_irq(char *buffer, unsigned long *flags) { unsigned long ptr = (unsigned long) buffer & PAGE_MASK; kunmap_atomic((void *) ptr); local_irq_restore(*flags); }

Contributors

PersonTokensPropCommitsCommitProp
Andrew Morton3990.70%120.00%
Alberto Bertogli12.33%120.00%
Adrian Bunk12.33%120.00%
Ingo Molnar12.33%120.00%
Jens Axboe12.33%120.00%
Total43100.00%5100.00%

#else
static inline char *bvec_kmap_irq(struct bio_vec *bvec, unsigned long *flags) { return page_address(bvec->bv_page) + bvec->bv_offset; }

Contributors

PersonTokensPropCommitsCommitProp
Geert Uytterhoeven2480.00%133.33%
Andrew Morton413.33%133.33%
Jens Axboe26.67%133.33%
Total30100.00%3100.00%


static inline void bvec_kunmap_irq(char *buffer, unsigned long *flags) { *flags = 0; }

Contributors

PersonTokensPropCommitsCommitProp
Geert Uytterhoeven1676.19%133.33%
Andrew Morton419.05%133.33%
Jens Axboe14.76%133.33%
Total21100.00%3100.00%

#endif /* * BIO list management for use by remapping drivers (e.g. DM or MD) and loop. * * A bio_list anchors a singly-linked list of bios chained through the bi_next * member of the bio. The bio_list also caches the last list member to allow * fast access to the tail. */ struct bio_list { struct bio *head; struct bio *tail; };
static inline int bio_list_empty(const struct bio_list *bl) { return bl->head == NULL; }

Contributors

PersonTokensPropCommitsCommitProp
Christoph Hellwig20100.00%1100.00%
Total20100.00%1100.00%


static inline void bio_list_init(struct bio_list *bl) { bl->head = bl->tail = NULL; }

Contributors

PersonTokensPropCommitsCommitProp
Christoph Hellwig22100.00%1100.00%
Total22100.00%1100.00%

#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; }

Contributors

PersonTokensPropCommitsCommitProp
Christoph Hellwig35100.00%1100.00%
Total35100.00%1100.00%


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; }

Contributors

PersonTokensPropCommitsCommitProp
Christoph Hellwig50100.00%1100.00%
Total50100.00%1100.00%


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; }

Contributors

PersonTokensPropCommitsCommitProp
Christoph Hellwig44100.00%1100.00%
Total44100.00%1100.00%


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; }

Contributors

PersonTokensPropCommitsCommitProp
Christoph Hellwig58100.00%1100.00%
Total58100.00%1100.00%


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; }

Contributors

PersonTokensPropCommitsCommitProp
Christoph Hellwig58100.00%1100.00%
Total58100.00%1100.00%


static inline struct bio *bio_list_peek(struct bio_list *bl) { return bl->head; }

Contributors

PersonTokensPropCommitsCommitProp
Geert Uytterhoeven19100.00%1100.00%
Total19100.00%1100.00%


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; }

Contributors

PersonTokensPropCommitsCommitProp
Christoph Hellwig61100.00%1100.00%
Total61100.00%1100.00%


static inline struct bio *bio_list_get(struct bio_list *bl) { struct bio *bio = bl->head; bl->head = bl->tail = NULL; return bio; }

Contributors

PersonTokensPropCommitsCommitProp
Christoph Hellwig36100.00%1100.00%
Total36100.00%1100.00%

/* * 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); }

Contributors

PersonTokensPropCommitsCommitProp
Mike Snitzer30100.00%1100.00%
Total30100.00%1100.00%

/* * 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 struct bio_set { struct kmem_cache *bio_slab; unsigned int front_pad; mempool_t *bio_pool; mempool_t *bvec_pool; #if defined(CONFIG_BLK_DEV_INTEGRITY) mempool_t *bio_integrity_pool; mempool_t *bvec_integrity_pool; #endif /* * Deadlock avoidance for stacking block drivers: see comments in * bio_alloc_bioset() for details */ spinlock_t rescue_lock; struct bio_list rescue_list; struct work_struct rescue_work; struct workqueue_struct *rescue_workqueue; }; struct biovec_slab { int nr_vecs; char *name; struct kmem_cache *slab; }; /* * a small number of entries is fine, not going to be performance critical. * basically we just need to survive */ #define BIO_SPLIT_ENTRIES 2 #if defined(CONFIG_BLK_DEV_INTEGRITY) #define bip_for_each_vec(bvl, bip, iter) \ for_each_bvec(bvl, (bip)->bip_vec, iter, (bip)->bip_iter) #define bio_for_each_integrity_vec(_bvl, _bio, _iter) \ for_each_bio(_bio) \ bip_for_each_vec(_bvl, _bio->bi_integrity, _iter) extern struct bio_integrity_payload *bio_integrity_alloc(struct bio *, gfp_t, unsigned int); extern int bio_integrity_add_page(struct bio *, struct page *, unsigned int, unsigned int); extern bool bio_integrity_prep(struct bio *); extern void bio_integrity_advance(struct bio *, unsigned int); extern void bio_integrity_trim(struct bio *); extern int bio_integrity_clone(struct bio *, struct bio *, gfp_t); extern int bioset_integrity_create(struct bio_set *, int); extern void bioset_integrity_free(struct bio_set *); extern void bio_integrity_init(void); #else /* CONFIG_BLK_DEV_INTEGRITY */
static inline void *bio_integrity(struct bio *bio) { return NULL; }

Contributors

PersonTokensPropCommitsCommitProp
Martin K. Petersen16100.00%3100.00%
Total16100.00%3100.00%


static inline int bioset_integrity_create(struct bio_set *bs, int pool_size) { return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Martin K. Petersen18100.00%2100.00%
Total18100.00%2100.00%


static inline void bioset_integrity_free (struct bio_set *bs) { return; }

Contributors

PersonTokensPropCommitsCommitProp
Martin K. Petersen13100.00%1100.00%
Total13100.00%1100.00%


static inline bool bio_integrity_prep(struct bio *bio) { return true; }

Contributors

PersonTokensPropCommitsCommitProp
Martin K. Petersen1386.67%266.67%
Dmitriy Monakhov213.33%133.33%
Total15100.00%3100.00%


static inline int bio_integrity_clone(struct bio *bio, struct bio *bio_src, gfp_t gfp_mask) { return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Stephen Rothwell1878.26%150.00%
Martin K. Petersen521.74%150.00%
Total23100.00%2100.00%


static inline void bio_integrity_advance(struct bio *bio, unsigned int bytes_done) { return; }

Contributors

PersonTokensPropCommitsCommitProp
Martin K. Petersen17100.00%2100.00%
Total17100.00%2100.00%


static inline void bio_integrity_trim(struct bio *bio) { return; }

Contributors

PersonTokensPropCommitsCommitProp
Martin K. Petersen13100.00%2100.00%
Total13100.00%2100.00%


static inline void bio_integrity_init(void) { return; }

Contributors

PersonTokensPropCommitsCommitProp
Martin K. Petersen10100.00%2100.00%
Total10100.00%2100.00%


static inline bool bio_integrity_flagged(struct bio *bio, enum bip_flags flag) { return false; }

Contributors

PersonTokensPropCommitsCommitProp
Martin K. Petersen19100.00%1100.00%
Total19100.00%1100.00%


static inline void *bio_integrity_alloc(struct bio * bio, gfp_t gfp, unsigned int nr) { return ERR_PTR(-EINVAL); }

Contributors

PersonTokensPropCommitsCommitProp
Keith Busch27100.00%1100.00%
Total27100.00%1100.00%


static inline int bio_integrity_add_page(struct bio *bio, struct page *page, unsigned int len, unsigned int offset) { return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Keith Busch28100.00%1100.00%
Total28100.00%1100.00%

#endif /* CONFIG_BLK_DEV_INTEGRITY */ #endif /* CONFIG_BLOCK */ #endif /* __LINUX_BIO_H */

Overall Contributors

PersonTokensPropCommitsCommitProp
Kent Overstreet63819.45%2719.71%
Christoph Hellwig49014.93%85.84%
Martin K. Petersen45513.87%118.03%
Jens Axboe36611.16%2417.52%
Ming Lei2507.62%21.46%
Linus Torvalds1474.48%85.84%
Andrew Morton1243.78%42.92%
Keith Busch902.74%10.73%
Dmitriy Monakhov782.38%32.19%
Tejun Heo682.07%42.92%
Geert Uytterhoeven591.80%21.46%
FUJITA Tomonori441.34%42.92%
Mike Christie441.34%32.19%
Michael Christie401.22%21.46%
Gu Zheng371.13%21.46%
Ilya Loginov361.10%10.73%
Dave Olien331.01%10.73%
Mike Snitzer310.94%10.73%
Paolo Valente300.91%10.73%
Chaitanya Kulkarni290.88%10.73%
Huang Ying240.73%10.73%
Neil Brown180.55%21.46%
Stephen Rothwell180.55%10.73%
Jiufei (Joyce) Xue160.49%10.73%
James Bottomley160.49%10.73%
Goldwyn Rodrigues160.49%10.73%
Adrian Hunter150.46%10.73%
Jeremy Fitzhardinge120.37%10.73%
Guoqing Jiang100.30%10.73%
Lei Ming100.30%10.73%
Jun'ichi Nomura60.18%21.46%
David Howells60.18%10.73%
David Woodhouse50.15%10.73%
Paul Gortmaker30.09%10.73%
Al Viro30.09%21.46%
Alberto Bertogli30.09%10.73%
Shaohua Li30.09%21.46%
Tom Rini20.06%10.73%
Adrian Bunk20.06%10.73%
Akinobu Mita10.03%10.73%
Dan Carpenter10.03%10.73%
Ingo Molnar10.03%10.73%
Alexey Dobriyan10.03%10.73%
Total3281100.00%137100.00%
Directory: include/linux
Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
Created with cregit.