bcache: Don't use op->insert_collision

When we convert bch_btree_insert() to bch_btree_map_leaf_nodes(), we
won't be passing struct btree_op to bch_btree_insert() anymore - so we
need a different way of returning whether there was a collision (really,
a replace collision).
Signed-off-by: Kent Overstreet <kmo@daterainc.com>

drivers/md/bcache/btree.c

@@ -2227,6 +2227,9 @@ int bch_btree_insert(struct btree_op *op, struct cache_set *c,
 		}
 	}
 
+	if (op->insert_collision)
+		return -ESRCH;
+
 	return ret;
 }
 

drivers/md/bcache/movinggc.c

@@ -52,7 +52,7 @@ static void write_moving_finish(struct closure *cl)
 	bio_for_each_segment_all(bv, bio, i)
 		__free_page(bv->bv_page);
 
-	if (io->s.op.insert_collision)
+	if (io->s.insert_collision)
 		trace_bcache_gc_copy_collision(&io->w->key);
 
 	bch_keybuf_del(&io->s.c->moving_gc_keys, io->w);

drivers/md/bcache/request.c

@@ -218,6 +218,7 @@ static void bch_data_insert_keys(struct closure *cl)
 	struct search *s = container_of(cl, struct search, btree);
 	atomic_t *journal_ref = NULL;
 	struct bkey *replace_key = s->replace ? &s->replace_key : NULL;
+	int ret;
 
 	/*
 	 * If we're looping, might already be waiting on
@@ -236,8 +237,11 @@ static void bch_data_insert_keys(struct closure *cl)
 					  s->flush_journal
 					  ? &s->cl : NULL);
 
-	if (bch_btree_insert(&s->op, s->c, &s->insert_keys,
-			     journal_ref, replace_key)) {
+	ret = bch_btree_insert(&s->op, s->c, &s->insert_keys,
+			       journal_ref, replace_key);
+	if (ret == -ESRCH) {
+		s->insert_collision = true;
+	} else if (ret) {
 		s->error		= -ENOMEM;
 		s->insert_data_done	= true;
 	}
@@ -977,7 +981,7 @@ static void cached_dev_cache_miss_done(struct closure *cl)
 {
 	struct search *s = container_of(cl, struct search, cl);
 
-	if (s->op.insert_collision)
+	if (s->insert_collision)
 		bch_mark_cache_miss_collision(s);
 
 	if (s->cache_bio) {

drivers/md/bcache/request.h

@@ -34,6 +34,7 @@ struct search {
 
 	unsigned		insert_data_done:1;
 	unsigned		replace:1;
+	unsigned		insert_collision:1;
 
 	uint16_t		write_prio;
 

drivers/md/bcache/writeback.c

@@ -142,6 +142,7 @@ static void write_dirty_finish(struct closure *cl)
 		unsigned i;
 		struct btree_op op;
 		struct keylist keys;
+		int ret;
 
 		bch_btree_op_init(&op, -1);
 		bch_keylist_init(&keys);
@@ -153,12 +154,12 @@ static void write_dirty_finish(struct closure *cl)
 		for (i = 0; i < KEY_PTRS(&w->key); i++)
 			atomic_inc(&PTR_BUCKET(dc->disk.c, &w->key, i)->pin);
 
-		bch_btree_insert(&op, dc->disk.c, &keys, NULL, &w->key);
+		ret = bch_btree_insert(&op, dc->disk.c, &keys, NULL, &w->key);
 
-		if (op.insert_collision)
+		if (ret)
 			trace_bcache_writeback_collision(&w->key);
 
-		atomic_long_inc(op.insert_collision
+		atomic_long_inc(ret
 				? &dc->disk.c->writeback_keys_failed
 				: &dc->disk.c->writeback_keys_done);
 	}