block: Convert some code to bio_for_each_segment_all()
More prep work for immutable bvecs:
A few places in the code were either open coding or using the wrong
version - fix.
After we introduce the bvec iter, it'll no longer be possible to modify
the biovec through bio_for_each_segment_all() - it doesn't increment a
pointer to the current bvec, you pass in a struct bio_vec (not a
pointer) which is updated with what the current biovec would be (taking
into account bi_bvec_done and bi_size).
So because of that it's more worthwhile to be consistent about
bio_for_each_segment()/bio_for_each_segment_all() usage.
Signed-off-by: Kent Overstreet <koverstreet@google.com>
CC: Jens Axboe <axboe@kernel.dk>
CC: NeilBrown <neilb@suse.de>
CC: Alasdair Kergon <agk@redhat.com>
CC: dm-devel@redhat.com
CC: Alexander Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/bio.c b/fs/bio.c
index 618f904..fe3aee90 100644
--- a/fs/bio.c
+++ b/fs/bio.c
@@ -1548,11 +1548,11 @@
*/
void bio_set_pages_dirty(struct bio *bio)
{
- struct bio_vec *bvec = bio->bi_io_vec;
+ struct bio_vec *bvec;
int i;
- for (i = 0; i < bio->bi_vcnt; i++) {
- struct page *page = bvec[i].bv_page;
+ bio_for_each_segment_all(bvec, bio, i) {
+ struct page *page = bvec->bv_page;
if (page && !PageCompound(page))
set_page_dirty_lock(page);
@@ -1561,11 +1561,11 @@
static void bio_release_pages(struct bio *bio)
{
- struct bio_vec *bvec = bio->bi_io_vec;
+ struct bio_vec *bvec;
int i;
- for (i = 0; i < bio->bi_vcnt; i++) {
- struct page *page = bvec[i].bv_page;
+ bio_for_each_segment_all(bvec, bio, i) {
+ struct page *page = bvec->bv_page;
if (page)
put_page(page);
@@ -1614,16 +1614,16 @@
void bio_check_pages_dirty(struct bio *bio)
{
- struct bio_vec *bvec = bio->bi_io_vec;
+ struct bio_vec *bvec;
int nr_clean_pages = 0;
int i;
- for (i = 0; i < bio->bi_vcnt; i++) {
- struct page *page = bvec[i].bv_page;
+ bio_for_each_segment_all(bvec, bio, i) {
+ struct page *page = bvec->bv_page;
if (PageDirty(page) || PageCompound(page)) {
page_cache_release(page);
- bvec[i].bv_page = NULL;
+ bvec->bv_page = NULL;
} else {
nr_clean_pages++;
}