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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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31
drivers/md/dm-io.c
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@@ -201,26 +201,29 @@ static void list_dp_init(struct dpages *dp, struct page_list *pl, unsigned offse
/*
* Functions for getting the pages from a bvec.
*/
static void bvec_get_page(struct dpages *dp,
static void bio_get_page(struct dpages *dp,
struct page **p, unsigned long *len, unsigned *offset)
{
struct bio_vec *bvec = (struct bio_vec *) dp->context_ptr;
*p = bvec->bv_page;
*len = bvec->bv_len;
*offset = bvec->bv_offset;
struct bio *bio = dp->context_ptr;
struct bio_vec bvec = bio_iovec(bio);
*p = bvec.bv_page;
*len = bvec.bv_len;
*offset = bvec.bv_offset;
}
static void bvec_next_page(struct dpages *dp)
static void bio_next_page(struct dpages *dp)
{
struct bio_vec *bvec = (struct bio_vec *) dp->context_ptr;
dp->context_ptr = bvec + 1;
struct bio *bio = dp->context_ptr;
struct bio_vec bvec = bio_iovec(bio);
bio_advance(bio, bvec.bv_len);
}
static void bvec_dp_init(struct dpages *dp, struct bio_vec *bvec)
static void bio_dp_init(struct dpages *dp, struct bio *bio)
{
dp->get_page = bvec_get_page;
dp->next_page = bvec_next_page;
dp->context_ptr = bvec;
dp->get_page = bio_get_page;
dp->next_page = bio_next_page;
dp->context_ptr = bio;
}
/*
@@ -457,8 +460,8 @@ static int dp_init(struct dm_io_request *io_req, struct dpages *dp,
list_dp_init(dp, io_req->mem.ptr.pl, io_req->mem.offset);
break;
case DM_IO_BVEC:
bvec_dp_init(dp, io_req->mem.ptr.bvec);
case DM_IO_BIO:
bio_dp_init(dp, io_req->mem.ptr.bio);
break;
case DM_IO_VMA: