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block: Add bio_copy_data_iter(), zero_fill_bio_iter()

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Add versions that take bvec_iter args instead of using bio->bi_iter - to
be used by bcachefs.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Kent Overstreet 2018-05-08 21:33:53 -04:00 committed by Jens Axboe
parent f4f8154a08
commit 38a72dac48
2 changed files with 39 additions and 23 deletions
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44
block/bio.c
View File

@ -530,20 +530,20 @@ struct bio *bio_alloc_bioset(gfp_t gfp_mask, unsigned int nr_iovecs,
}
EXPORT_SYMBOL(bio_alloc_bioset);
void zero_fill_bio(struct bio *bio)
void zero_fill_bio_iter(struct bio *bio, struct bvec_iter start)
{
unsigned long flags;
struct bio_vec bv;
struct bvec_iter iter;
bio_for_each_segment(bv, bio, iter) {
__bio_for_each_segment(bv, bio, iter, start) {
char *data = bvec_kmap_irq(&bv, &flags);
memset(data, 0, bv.bv_len);
flush_dcache_page(bv.bv_page);
bvec_kunmap_irq(data, &flags);
}
}
EXPORT_SYMBOL(zero_fill_bio);
EXPORT_SYMBOL(zero_fill_bio_iter);
/**
* bio_put - release a reference to a bio
@ -971,28 +971,13 @@ void bio_advance(struct bio *bio, unsigned bytes)
}
EXPORT_SYMBOL(bio_advance);
/**
* bio_copy_data - copy contents of data buffers from one chain of bios to
* another
* @src: source bio list
* @dst: destination bio list
*
* If @src and @dst are single bios, bi_next must be NULL - otherwise, treats
* @src and @dst as linked lists of bios.
*
* Stops when it reaches the end of either @src or @dst - that is, copies
* min(src->bi_size, dst->bi_size) bytes (or the equivalent for lists of bios).
*/
void bio_copy_data(struct bio *dst, struct bio *src)
void bio_copy_data_iter(struct bio *dst, struct bvec_iter dst_iter,
struct bio *src, struct bvec_iter src_iter)
{
struct bvec_iter src_iter, dst_iter;
struct bio_vec src_bv, dst_bv;
void *src_p, *dst_p;
unsigned bytes;
src_iter = src->bi_iter;
dst_iter = dst->bi_iter;
while (1) {
if (!src_iter.bi_size) {
src = src->bi_next;
@ -1029,6 +1014,25 @@ void bio_copy_data(struct bio *dst, struct bio *src)
bio_advance_iter(dst, &dst_iter, bytes);
}
}
EXPORT_SYMBOL(bio_copy_data_iter);
/**
* bio_copy_data - copy contents of data buffers from one chain of bios to
* another
* @src: source bio list
* @dst: destination bio list
*
* If @src and @dst are single bios, bi_next must be NULL - otherwise, treats
* @src and @dst as linked lists of bios.
*
* Stops when it reaches the end of either @src or @dst - that is, copies
* min(src->bi_size, dst->bi_size) bytes (or the equivalent for lists of bios).
*/
void bio_copy_data(struct bio *dst, struct bio *src)
{
bio_copy_data_iter(dst, dst->bi_iter,
src, src->bi_iter);
}
EXPORT_SYMBOL(bio_copy_data);
struct bio_map_data {

18
include/linux/bio.h
View File

@ -67,8 +67,12 @@
#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)))
#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)
/*
* Return the data direction, READ or WRITE.
@ -501,6 +505,8 @@ static inline void bio_flush_dcache_pages(struct bio *bi)
}
#endif
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);
extern void bio_free_pages(struct bio *bio);
@ -509,7 +515,13 @@ extern struct bio *bio_copy_user_iov(struct request_queue *,
struct iov_iter *,
gfp_t);
extern int bio_uncopy_user(struct bio *);
void zero_fill_bio(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);
}
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);