bio_copy_data_iter

Name:bio_copy_data_iter

Proto:void bio_copy_data_iter(struct bio *dst, struct bvec_iter *dst_iter, struct bio *src, struct bvec_iter *src_iter)

Type:void

Parameter:

Type	Parameter	Name
struct bio *	dst
struct bvec_iter *	dst_iter
struct bio *	src
struct bvec_iter *	src_iter

1060

When residual I/O count && residual I/O count cycle

1061

src_bv = bio_iter_iovec(src, * src_iter)

1062

dst_bv = bio_iter_iovec(dst, * dst_iter)

1064

bytes = min - return minimum of two values of the same or compatible types*@x: first value*@y: second value(bv_len, bv_len)

1066

src_p = kmap_atomic(bv_page)

1067

dst_p = kmap_atomic(bv_page)

1069

memcpy(dst_p + bv_offset, src_p + bv_offset, bytes)

1073

Prevent people trying to call kunmap_atomic() as if it were kunmap()* kunmap_atomic() should get the return value of kmap_atomic, not the page.(dst_p)

1074

Prevent people trying to call kunmap_atomic() as if it were kunmap()* kunmap_atomic() should get the return value of kmap_atomic, not the page.(src_p)

1076

flush_dcache_page(bv_page)

1078

bio_advance_iter(src, src_iter, bytes)

1079

bio_advance_iter(dst, dst_iter, bytes)

**Caller**
Name	Describe
bio_copy_data	_copy_data - copy contents of data buffers from one bio to another@src: source bio@dst: destination bio* 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).
bio_list_copy_data	_list_copy_data - copy contents of data buffers from one chain of bios to* another@src: source bio list@dst: destination bio list* Stops when it reaches the end of either the @src list or @dst list - that is,* copies min(src->bi_size, dst->bi_size)

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