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block: Convert some code to bio_for_each_segment_all()

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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>
This commit is contained in:
Kent Overstreet
2012-09-05 15:22:02 -07:00
parent d74c6d514f
commit cb34e057ad
5 changed files with 19 additions and 24 deletions
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20
fs/bio.c
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@@ -1548,11 +1548,11 @@ EXPORT_SYMBOL(bio_copy_kern);
*/
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 @@ void bio_set_pages_dirty(struct bio *bio)
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 @@ static void bio_dirty_fn(struct work_struct *work)
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++;
}