bcache: Zero less memory
Another minor performance optimization
Signed-off-by: Kent Overstreet <kmo@daterainc.com>
diff --git a/drivers/md/bcache/request.c b/drivers/md/bcache/request.c
index 59b3d6d..cce02f1 100644
--- a/drivers/md/bcache/request.c
+++ b/drivers/md/bcache/request.c
@@ -597,14 +597,12 @@
/* Stack frame for bio_complete */
struct closure cl;
- struct bcache_device *d;
-
struct bbio bio;
struct bio *orig_bio;
struct bio *cache_miss;
+ struct bcache_device *d;
unsigned insert_bio_sectors;
-
unsigned recoverable:1;
unsigned write:1;
unsigned read_dirty_data:1;
@@ -712,10 +710,13 @@
{
struct search *s = container_of(cl, struct search, iop.cl);
struct bio *bio = &s->bio.bio;
+ int ret;
- int ret = bch_btree_map_keys(&s->op, s->iop.c,
- &KEY(s->iop.inode, bio->bi_iter.bi_sector, 0),
- cache_lookup_fn, MAP_END_KEY);
+ bch_btree_op_init(&s->op, -1);
+
+ ret = bch_btree_map_keys(&s->op, s->iop.c,
+ &KEY(s->iop.inode, bio->bi_iter.bi_sector, 0),
+ cache_lookup_fn, MAP_END_KEY);
if (ret == -EAGAIN)
continue_at(cl, cache_lookup, bcache_wq);
@@ -756,12 +757,12 @@
}
}
-static void do_bio_hook(struct search *s)
+static void do_bio_hook(struct search *s, struct bio *orig_bio)
{
struct bio *bio = &s->bio.bio;
bio_init(bio);
- __bio_clone_fast(bio, s->orig_bio);
+ __bio_clone_fast(bio, orig_bio);
bio->bi_end_io = request_endio;
bio->bi_private = &s->cl;
@@ -780,26 +781,32 @@
mempool_free(s, s->d->c->search);
}
-static struct search *search_alloc(struct bio *bio, struct bcache_device *d)
+static inline struct search *search_alloc(struct bio *bio,
+ struct bcache_device *d)
{
struct search *s;
s = mempool_alloc(d->c->search, GFP_NOIO);
- memset(s, 0, offsetof(struct search, iop.insert_keys));
- __closure_init(&s->cl, NULL);
+ closure_init(&s->cl, NULL);
+ do_bio_hook(s, bio);
- s->iop.inode = d->id;
- s->iop.c = d->c;
- s->d = d;
- s->op.lock = -1;
- s->iop.write_point = hash_long((unsigned long) current, 16);
s->orig_bio = bio;
- s->write = (bio->bi_rw & REQ_WRITE) != 0;
- s->iop.flush_journal = (bio->bi_rw & (REQ_FLUSH|REQ_FUA)) != 0;
+ s->cache_miss = NULL;
+ s->d = d;
s->recoverable = 1;
+ s->write = (bio->bi_rw & REQ_WRITE) != 0;
+ s->read_dirty_data = 0;
s->start_time = jiffies;
- do_bio_hook(s);
+
+ s->iop.c = d->c;
+ s->iop.bio = NULL;
+ s->iop.inode = d->id;
+ s->iop.write_point = hash_long((unsigned long) current, 16);
+ s->iop.write_prio = 0;
+ s->iop.error = 0;
+ s->iop.flags = 0;
+ s->iop.flush_journal = (bio->bi_rw & (REQ_FLUSH|REQ_FUA)) != 0;
return s;
}
@@ -845,7 +852,7 @@
trace_bcache_read_retry(s->orig_bio);
s->iop.error = 0;
- do_bio_hook(s);
+ do_bio_hook(s, s->orig_bio);
/* XXX: invalidate cache */