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block: Convert drivers to immutable biovecs

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Now that we've got a mechanism for immutable biovecs -
bi_iter.bi_bvec_done - we need to convert drivers to use primitives that
respect it instead of using the bvec array directly.

Signed-off-by: Kent Overstreet <kmo@daterainc.com>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: NeilBrown <neilb@suse.de>
Cc: Alasdair Kergon <agk@redhat.com>
Cc: dm-devel@redhat.com
This commit is contained in:
Kent Overstreet
2013-10-11 15:45:43 -07:00
parent 458b76ed2f
commit 003b5c5719
7 changed files with 88 additions and 118 deletions
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14
fs/bio.c
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@@ -525,8 +525,17 @@ EXPORT_SYMBOL(bio_phys_segments);
*/
void __bio_clone(struct bio *bio, struct bio *bio_src)
{
memcpy(bio->bi_io_vec, bio_src->bi_io_vec,
bio_src->bi_max_vecs * sizeof(struct bio_vec));
if (bio_is_rw(bio_src)) {
struct bio_vec bv;
struct bvec_iter iter;
bio_for_each_segment(bv, bio_src, iter)
bio->bi_io_vec[bio->bi_vcnt++] = bv;
} else if (bio_has_data(bio_src)) {
memcpy(bio->bi_io_vec, bio_src->bi_io_vec,
bio_src->bi_max_vecs * sizeof(struct bio_vec));
bio->bi_vcnt = bio_src->bi_vcnt;
}
/*
* most users will be overriding ->bi_bdev with a new target,
@@ -535,7 +544,6 @@ void __bio_clone(struct bio *bio, struct bio *bio_src)
bio->bi_bdev = bio_src->bi_bdev;
bio->bi_flags |= 1 << BIO_CLONED;
bio->bi_rw = bio_src->bi_rw;
bio->bi_vcnt = bio_src->bi_vcnt;
bio->bi_iter = bio_src->bi_iter;
}
EXPORT_SYMBOL(__bio_clone);