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block: Convert bio_copy_data() to bvec_iter 

Our fancy new bvec iterator makes code like this much easier to write.

Signed-off-by: Kent Overstreet <kmo@daterainc.com>
Cc: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Kent Overstreet 2013-08-07 14:26:39 -07:00
parent 4550dd6c6b
commit 1cb9dda4f4
1 changed files with 25 additions and 35 deletions
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60
fs/bio.c
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@ -852,58 +852,48 @@ EXPORT_SYMBOL(bio_alloc_pages);
*/
void bio_copy_data(struct bio *dst, struct bio *src)
{
struct bio_vec *src_bv, *dst_bv;
unsigned src_offset, dst_offset, bytes;
struct bvec_iter src_iter, dst_iter;
struct bio_vec src_bv, dst_bv;
void *src_p, *dst_p;
unsigned bytes;
src_bv = __bio_iovec(src);
dst_bv = __bio_iovec(dst);
src_offset = src_bv->bv_offset;
dst_offset = dst_bv->bv_offset;
src_iter = src->bi_iter;
dst_iter = dst->bi_iter;
while (1) {
if (src_offset == src_bv->bv_offset + src_bv->bv_len) {
src_bv++;
if (src_bv == bio_iovec_idx(src, src->bi_vcnt)) {
src = src->bi_next;
if (!src)
break;
if (!src_iter.bi_size) {
src = src->bi_next;
if (!src)
break;
src_bv = __bio_iovec(src);
}
src_offset = src_bv->bv_offset;
src_iter = src->bi_iter;
}
if (dst_offset == dst_bv->bv_offset + dst_bv->bv_len) {
dst_bv++;
if (dst_bv == bio_iovec_idx(dst, dst->bi_vcnt)) {
dst = dst->bi_next;
if (!dst)
break;
if (!dst_iter.bi_size) {
dst = dst->bi_next;
if (!dst)
break;
dst_bv = __bio_iovec(dst);
}
dst_offset = dst_bv->bv_offset;
dst_iter = dst->bi_iter;
}
bytes = min(dst_bv->bv_offset + dst_bv->bv_len - dst_offset,
src_bv->bv_offset + src_bv->bv_len - src_offset);
src_bv = bio_iter_iovec(src, src_iter);
dst_bv = bio_iter_iovec(dst, dst_iter);
src_p = kmap_atomic(src_bv->bv_page);
dst_p = kmap_atomic(dst_bv->bv_page);
bytes = min(src_bv.bv_len, dst_bv.bv_len);
memcpy(dst_p + dst_offset,
src_p + src_offset,
src_p = kmap_atomic(src_bv.bv_page);
dst_p = kmap_atomic(dst_bv.bv_page);
memcpy(dst_p + dst_bv.bv_offset,
src_p + src_bv.bv_offset,
bytes);
kunmap_atomic(dst_p);
kunmap_atomic(src_p);
src_offset += bytes;
dst_offset += bytes;
bio_advance_iter(src, &src_iter, bytes);
bio_advance_iter(dst, &dst_iter, bytes);
}
}
EXPORT_SYMBOL(bio_copy_data);