Release 4.12 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


#define BIO_MAX_PAGES		256


#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;
}

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Adrian Hunter 7 14.29% 1 25.00%
Chaitanya Kulkarni 7 14.29% 1 25.00%
Michael Christie 5 10.20% 1 25.00%
Total 49 100.00% 4 100.00%



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;
}

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Michael Christie 27 65.85% 1 33.33%
Chaitanya Kulkarni 7 17.07% 1 33.33%
Adrian Hunter 7 17.07% 1 33.33%
Total 41 100.00% 3 100.00%



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

	return true;
}

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Kent Overstreet 25 96.15% 1 50.00%
Jens Axboe 1 3.85% 1 50.00%
Total 26 100.00% 2 100.00%



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;
}

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Jens Axboe 25 67.57% 1 16.67%
Kent Overstreet 6 16.22% 3 50.00%
David Woodhouse 5 13.51% 1 16.67%
Tejun Heo 1 2.70% 1 16.67%
Total 37 100.00% 6 100.00%



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

	return NULL;
}

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Jens Axboe 34 91.89% 1 50.00%
Kent Overstreet 3 8.11% 1 50.00%
Total 37 100.00% 2 100.00%

/*
 * will die
 */

#define bio_to_phys(bio)	(page_to_phys(bio_page((bio))) + (unsigned long) bio_offset((bio)))

#define bvec_to_phys(bv)	(page_to_phys((bv)->bv_page) + (unsigned long) (bv)->bv_offset)

/*
 * queues that have highmem support enabled may still need to revert to
 * PIO transfers occasionally and thus map high pages temporarily. For
 * permanent PIO fall back, user is probably better off disabling highmem
 * I/O completely on that queue (see ide-dma for example)
 */

#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)

/*
 * 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;
	else
		bvec_iter_advance(bio->bi_io_vec, iter, bytes);
}

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Michael Christie 3 5.66% 1 50.00%
Total 53 100.00% 2 100.00%


#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;
}

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Chaitanya Kulkarni 15 21.74% 1 14.29%
Christoph Hellwig 5 7.25% 1 14.29%
Michael Christie 3 4.35% 1 14.29%
Shaohua Li 2 2.90% 1 14.29%
Adrian Hunter 1 1.45% 1 14.29%
Total 69 100.00% 7 100.00%

/*
 * 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);
}

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Jens Axboe 29 87.88% 1 50.00%
Linus Torvalds 4 12.12% 1 50.00%
Total 33 100.00% 2 100.00%



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);
}

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Jens Axboe 47 100.00% 1 100.00%
Total 47 100.00% 1 100.00%



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

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Jens Axboe 31 100.00% 2 100.00%
Total 31 100.00% 2 100.00%



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

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

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

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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;
}

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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;

	
bio_end_io_t		*bip_end_io;	/* saved I/O completion fn */

	
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;
}

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Jens Axboe 1 3.33% 1 50.00%
Total 30 100.00% 2 100.00%



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;
}

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Martin K. Petersen 40 100.00% 3 100.00%
Total 40 100.00% 3 100.00%



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

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

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#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);
}

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extern struct bio_set *bioset_create(unsigned int, unsigned int);
extern struct bio_set *bioset_create_nobvec(unsigned int, unsigned int);
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);
}

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Dave Olien 4 15.38% 1 25.00%
Jens Axboe 2 7.69% 1 25.00%
Al Viro 1 3.85% 1 25.00%
Total 26 100.00% 4 100.00%



static inline struct bio *bio_clone(struct bio *bio, gfp_t gfp_mask)
{
	return bio_clone_bioset(bio, gfp_mask, fs_bio_set);
}

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

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Linus Torvalds 3 11.54% 1 33.33%
Peter Osterlund 1 3.85% 1 33.33%
Total 26 100.00% 3 100.00%



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

}

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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_error = -EIO;
	bio_endio(bio);
}

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Total 24 100.00% 1 100.00%

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 *,
				    const 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(int rw, unsigned long sectors,
			   struct hd_struct *part);
void generic_end_io_acct(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)
{
}
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#endif

extern void bio_copy_data(struct bio *dst, struct bio *src);
extern int bio_alloc_pages(struct bio *bio, gfp_t gfp);
extern void bio_free_pages(struct bio *bio);

extern struct bio *bio_copy_user_iov(struct request_queue *,
				     struct rq_map_data *,
				     const 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);

#ifdef CONFIG_BLK_CGROUP
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; }
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static inline int bio_associate_current(struct bio *bio) { return -ENOENT; }
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static inline void bio_disassociate_task(struct bio *bio) { }
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static inline void bio_clone_blkcg_association(struct bio *dst,
			struct bio *src) { }
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#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;
}

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Andrew Morton 49 80.33% 3 42.86%
Jens Axboe 10 16.39% 2 28.57%
Alberto Bertogli 1 1.64% 1 14.29%
Adrian Bunk 1 1.64% 1 14.29%
Total 61 100.00% 7 100.00%



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);
}

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Andrew Morton 39 90.70% 1 20.00%
Jens Axboe 1 2.33% 1 20.00%
Ingo Molnar 1 2.33% 1 20.00%
Adrian Bunk 1 2.33% 1 20.00%
Alberto Bertogli 1 2.33% 1 20.00%
Total 43 100.00% 5 100.00%

#else


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

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Geert Uytterhoeven 24 80.00% 1 33.33%
Andrew Morton 4 13.33% 1 33.33%
Jens Axboe 2 6.67% 1 33.33%
Total 30 100.00% 3 100.00%



static inline void bvec_kunmap_irq(char *buffer, unsigned long *flags)
{
	*flags = 0;
}
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Geert Uytterhoeven 16 76.19% 1 33.33%
Andrew Morton 4 19.05% 1 33.33%
Jens Axboe 1 4.76% 1 33.33%
Total 21 100.00% 3 100.00%

#endif



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);
}
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Jens Axboe 29 80.56% 1 33.33%
Kent Overstreet 6 16.67% 1 33.33%
Adrian Bunk 1 2.78% 1 33.33%
Total 36 100.00% 3 100.00%


#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)

/*
 * 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
Person Tokens Prop Commits CommitProp
Christoph Hellwig 20 100.00% 1 100.00%
Total 20 100.00% 1 100.00%



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

Contributors
Person Tokens Prop Commits CommitProp
Christoph Hellwig 22 100.00% 1 100.00%
Total 22 100.00% 1 100.00%


#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
Person Tokens Prop Commits CommitProp
Christoph Hellwig 35 100.00% 1 100.00%
Total 35 100.00% 1 100.00%



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
Person Tokens Prop Commits CommitProp
Christoph Hellwig 50 100.00% 1 100.00%
Total 50 100.00% 1 100.00%



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
Person Tokens Prop Commits CommitProp
Christoph Hellwig 44 100.00% 1 100.00%
Total 44 100.00% 1 100.00%



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
Person Tokens Prop Commits CommitProp
Christoph Hellwig 58 100.00% 1 100.00%
Total 58 100.00% 1 100.00%



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
Person Tokens Prop Commits CommitProp
Christoph Hellwig 58 100.00% 1 100.00%
Total 58 100.00% 1 100.00%



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

Contributors
Person Tokens Prop Commits CommitProp
Geert Uytterhoeven 19 100.00% 1 100.00%
Total 19 100.00% 1 100.00%



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
Person Tokens Prop Commits CommitProp
Christoph Hellwig 61 100.00% 1 100.00%
Total 61 100.00% 1 100.00%



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

	bl->head = bl->tail = NULL;

	return bio;
}

Contributors
Person Tokens Prop Commits CommitProp
Christoph Hellwig 36 100.00% 1 100.00%
Total 36 100.00% 1 100.00%

/*
 * 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
Person Tokens Prop Commits CommitProp
Mike Snitzer 30 100.00% 1 100.00%
Total 30 100.00% 1 100.00%

/*
 * 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 void bio_integrity_free(struct bio *);
extern int bio_integrity_add_page(struct bio *, struct page *, unsigned int, unsigned int);
extern bool bio_integrity_enabled(struct bio *bio);
extern int bio_integrity_prep(struct bio *);
extern void bio_integrity_endio(struct bio *);
extern void bio_integrity_advance(struct bio *, unsigned int);
extern void bio_integrity_trim(struct bio *, unsigned int, unsigned int);
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
Person Tokens Prop Commits CommitProp
Martin K. Petersen 16 100.00% 3 100.00%
Total 16 100.00% 3 100.00%



static inline bool bio_integrity_enabled(struct bio *bio)
{
	return false;
}

Contributors
Person Tokens Prop Commits CommitProp
Martin K. Petersen 15 100.00% 2 100.00%
Total 15 100.00% 2 100.00%



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

Contributors
Person Tokens Prop Commits CommitProp
Martin K. Petersen 18 100.00% 2 100.00%
Total 18 100.00% 2 100.00%



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

Contributors
Person Tokens Prop Commits CommitProp
Martin K. Petersen 13 100.00% 1 100.00%
Total 13 100.00% 1 100.00%



static inline int bio_integrity_prep(struct bio *bio)
{
	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
Martin K. Petersen 15 100.00% 2 100.00%
Total 15 100.00% 2 100.00%



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

Contributors
Person Tokens Prop Commits CommitProp
Martin K. Petersen 13 100.00% 2 100.00%
Total 13 100.00% 2 100.00%



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

Contributors
Person Tokens Prop Commits CommitProp
Stephen Rothwell 18 78.26% 1 50.00%
Martin K. Petersen 5 21.74% 1 50.00%
Total 23 100.00% 2 100.00%



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

Contributors
Person Tokens Prop Commits CommitProp
Martin K. Petersen 17 100.00% 2 100.00%
Total 17 100.00% 2 100.00%



static inline void bio_integrity_trim(struct bio *bio, unsigned int offset,
				      unsigned int sectors)
{
	return;
}

Contributors
Person Tokens Prop Commits CommitProp
Martin K. Petersen 21 100.00% 2 100.00%
Total 21 100.00% 2 100.00%



static inline void bio_integrity_init(void)
{
	return;
}

Contributors
Person Tokens Prop Commits CommitProp
Martin K. Petersen 10 100.00% 2 100.00%
Total 10 100.00% 2 100.00%



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

Contributors
Person Tokens Prop Commits CommitProp
Martin K. Petersen 19 100.00% 1 100.00%
Total 19 100.00% 1 100.00%



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

Contributors
Person Tokens Prop Commits CommitProp
Keith Busch 27 100.00% 1 100.00%
Total 27 100.00% 1 100.00%



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

Contributors
Person Tokens Prop Commits CommitProp
Keith Busch 28 100.00% 1 100.00%
Total 28 100.00% 1 100.00%

#endif /* CONFIG_BLK_DEV_INTEGRITY */

#endif /* CONFIG_BLOCK */
#endif /* __LINUX_BIO_H */
Overall Contributors
Person Tokens Prop Commits CommitProp
Kent Overstreet 687 21.38% 28 22.40%
Martin K. Petersen 532 16.55% 11 8.80%
Christoph Hellwig 457 14.22% 6 4.80%
Jens Axboe 409 12.73% 21 16.80%
Linus Torvalds 163 5.07% 7 5.60%
Ming Lei 135 4.20% 1 0.80%
Andrew Morton 128 3.98% 4 3.20%
Tejun Heo 93 2.89% 4 3.20%
Keith Busch 90 2.80% 1 0.80%
Geert Uytterhoeven 59 1.84% 2 1.60%
Mike Christie 46 1.43% 3 2.40%
FUJITA Tomonori 44 1.37% 4 3.20%
Michael Christie 40 1.24% 2 1.60%
Gu Zheng 37 1.15% 2 1.60%
Dave Olien 36 1.12% 1 0.80%
Ilya Loginov 36 1.12% 1 0.80%
Mike Snitzer 31 0.96% 1 0.80%
Paolo Valente 30 0.93% 1 0.80%
Chaitanya Kulkarni 29 0.90% 1 0.80%
Stephen Rothwell 18 0.56% 1 0.80%
James Bottomley 16 0.50% 1 0.80%
Adrian Hunter 15 0.47% 1 0.80%
Jun'ichi Nomura 14 0.44% 2 1.60%
Jeremy Fitzhardinge 12 0.37% 1 0.80%
Lei Ming 10 0.31% 1 0.80%
Guoqing Jiang 10 0.31% 1 0.80%
David Howells 6 0.19% 1 0.80%
Al Viro 5 0.16% 3 2.40%
David Woodhouse 5 0.16% 1 0.80%
Peter Osterlund 3 0.09% 1 0.80%
Adrian Bunk 3 0.09% 1 0.80%
Paul Gortmaker 3 0.09% 1 0.80%
Alberto Bertogli 3 0.09% 1 0.80%
Shaohua Li 2 0.06% 1 0.80%
Tom Rini 2 0.06% 1 0.80%
Alexey Dobriyan 1 0.03% 1 0.80%
Dan Carpenter 1 0.03% 1 0.80%
Akinobu Mita 1 0.03% 1 0.80%
Ingo Molnar 1 0.03% 1 0.80%
Américo Wang 1 0.03% 1 0.80%
Total 3214 100.00% 125 100.00%
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.
Person	Tokens	Prop	Commits	CommitProp
Kent Overstreet	30	61.22%	1	25.00%
Adrian Hunter	7	14.29%	1	25.00%
Chaitanya Kulkarni	7	14.29%	1	25.00%
Michael Christie	5	10.20%	1	25.00%
Total	49	100.00%	4	100.00%
cregit-Linux how code gets into the kernel

Release 4.12 include/linux/bio.h

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