bcache: Use standard utility code
Some of bcache's utility code has made it into the rest of the kernel,
so drop the bcache versions.
Bcache used to have a workaround for allocating from a bio set under
generic_make_request() (if you allocated more than once, the bios you
already allocated would get stuck on current->bio_list when you
submitted, and you'd risk deadlock) - bcache would mask out __GFP_WAIT
when allocating bios under generic_make_request() so that allocation
could fail and it could retry from workqueue. But bio_alloc_bioset() has
a workaround now, so we can drop this hack and the associated error
handling.
Signed-off-by: Kent Overstreet <koverstreet@google.com>
diff --git a/drivers/md/bcache/request.c b/drivers/md/bcache/request.c
index bcdf1f7..b6e74d3 100644
--- a/drivers/md/bcache/request.c
+++ b/drivers/md/bcache/request.c
@@ -509,10 +509,6 @@
goto err;
n = bch_bio_split(bio, KEY_SIZE(k), GFP_NOIO, split);
- if (!n) {
- __bkey_put(op->c, k);
- continue_at(cl, bch_insert_data_loop, bcache_wq);
- }
n->bi_end_io = bch_insert_data_endio;
n->bi_private = cl;
@@ -821,53 +817,13 @@
*/
if (s->op.cache_bio) {
- struct bio_vec *src, *dst;
- unsigned src_offset, dst_offset, bytes;
- void *dst_ptr;
-
bio_reset(s->op.cache_bio);
s->op.cache_bio->bi_sector = s->cache_miss->bi_sector;
s->op.cache_bio->bi_bdev = s->cache_miss->bi_bdev;
s->op.cache_bio->bi_size = s->cache_bio_sectors << 9;
bch_bio_map(s->op.cache_bio, NULL);
- src = bio_iovec(s->op.cache_bio);
- dst = bio_iovec(s->cache_miss);
- src_offset = src->bv_offset;
- dst_offset = dst->bv_offset;
- dst_ptr = kmap(dst->bv_page);
-
- while (1) {
- if (dst_offset == dst->bv_offset + dst->bv_len) {
- kunmap(dst->bv_page);
- dst++;
- if (dst == bio_iovec_idx(s->cache_miss,
- s->cache_miss->bi_vcnt))
- break;
-
- dst_offset = dst->bv_offset;
- dst_ptr = kmap(dst->bv_page);
- }
-
- if (src_offset == src->bv_offset + src->bv_len) {
- src++;
- if (src == bio_iovec_idx(s->op.cache_bio,
- s->op.cache_bio->bi_vcnt))
- BUG();
-
- src_offset = src->bv_offset;
- }
-
- bytes = min(dst->bv_offset + dst->bv_len - dst_offset,
- src->bv_offset + src->bv_len - src_offset);
-
- memcpy(dst_ptr + dst_offset,
- page_address(src->bv_page) + src_offset,
- bytes);
-
- src_offset += bytes;
- dst_offset += bytes;
- }
+ bio_copy_data(s->cache_miss, s->op.cache_bio);
bio_put(s->cache_miss);
s->cache_miss = NULL;
@@ -912,9 +868,6 @@
struct bio *miss;
miss = bch_bio_split(bio, sectors, GFP_NOIO, s->d->bio_split);
- if (!miss)
- return -EAGAIN;
-
if (miss == bio)
s->op.lookup_done = true;
@@ -933,8 +886,9 @@
reada = min(dc->readahead >> 9,
sectors - bio_sectors(miss));
- if (bio_end(miss) + reada > bdev_sectors(miss->bi_bdev))
- reada = bdev_sectors(miss->bi_bdev) - bio_end(miss);
+ if (bio_end_sector(miss) + reada > bdev_sectors(miss->bi_bdev))
+ reada = bdev_sectors(miss->bi_bdev) -
+ bio_end_sector(miss);
}
s->cache_bio_sectors = bio_sectors(miss) + reada;
@@ -958,7 +912,7 @@
goto out_put;
bch_bio_map(s->op.cache_bio, NULL);
- if (bch_bio_alloc_pages(s->op.cache_bio, __GFP_NOWARN|GFP_NOIO))
+ if (bio_alloc_pages(s->op.cache_bio, __GFP_NOWARN|GFP_NOIO))
goto out_put;
s->cache_miss = miss;
@@ -1002,7 +956,7 @@
struct bio *bio = &s->bio.bio;
struct bkey start, end;
start = KEY(dc->disk.id, bio->bi_sector, 0);
- end = KEY(dc->disk.id, bio_end(bio), 0);
+ end = KEY(dc->disk.id, bio_end_sector(bio), 0);
bch_keybuf_check_overlapping(&s->op.c->moving_gc_keys, &start, &end);
@@ -1176,7 +1130,7 @@
if (i->sequential + bio->bi_size > i->sequential)
i->sequential += bio->bi_size;
- i->last = bio_end(bio);
+ i->last = bio_end_sector(bio);
i->jiffies = jiffies + msecs_to_jiffies(5000);
s->task->sequential_io = i->sequential;
@@ -1294,30 +1248,25 @@
static int flash_dev_cache_miss(struct btree *b, struct search *s,
struct bio *bio, unsigned sectors)
{
+ struct bio_vec *bv;
+ int i;
+
/* Zero fill bio */
- while (bio->bi_idx != bio->bi_vcnt) {
- struct bio_vec *bv = bio_iovec(bio);
+ bio_for_each_segment(bv, bio, i) {
unsigned j = min(bv->bv_len >> 9, sectors);
void *p = kmap(bv->bv_page);
memset(p + bv->bv_offset, 0, j << 9);
kunmap(bv->bv_page);
- bv->bv_len -= j << 9;
- bv->bv_offset += j << 9;
-
- if (bv->bv_len)
- return 0;
-
- bio->bi_sector += j;
- bio->bi_size -= j << 9;
-
- bio->bi_idx++;
- sectors -= j;
+ sectors -= j;
}
- s->op.lookup_done = true;
+ bio_advance(bio, min(sectors << 9, bio->bi_size));
+
+ if (!bio->bi_size)
+ s->op.lookup_done = true;
return 0;
}
@@ -1344,8 +1293,8 @@
closure_call(&s->op.cl, btree_read_async, NULL, cl);
} else if (bio_has_data(bio) || s->op.skip) {
bch_keybuf_check_overlapping(&s->op.c->moving_gc_keys,
- &KEY(d->id, bio->bi_sector, 0),
- &KEY(d->id, bio_end(bio), 0));
+ &KEY(d->id, bio->bi_sector, 0),
+ &KEY(d->id, bio_end_sector(bio), 0));
s->writeback = true;
s->op.cache_bio = bio;