+ for (i = 0; i < ARRAY_SIZE(c->usage); i++)
+ bch2_fs_usage_acc_to_base(c, i);
+
+ for_each_member_device(ca, c, dev) {
+ struct bch_dev_usage *dst = ca->usage_base;
+ struct bch_dev_usage *src = (void *)
+ bch2_acc_percpu_u64s((void *) ca->usage_gc,
+ dev_usage_u64s());
+
+ copy_dev_field(buckets_ec, "buckets_ec");
+ copy_dev_field(buckets_unavailable, "buckets_unavailable");
+
+ for (i = 0; i < BCH_DATA_NR; i++) {
+ copy_dev_field(d[i].buckets, "%s buckets", bch2_data_types[i]);
+ copy_dev_field(d[i].sectors, "%s sectors", bch2_data_types[i]);
+ copy_dev_field(d[i].fragmented, "%s fragmented", bch2_data_types[i]);
+ }
+ };
+
+ {
+ unsigned nr = fs_usage_u64s(c);
+ struct bch_fs_usage *dst = c->usage_base;
+ struct bch_fs_usage *src = (void *)
+ bch2_acc_percpu_u64s((void *) c->usage_gc, nr);
+
+ copy_fs_field(hidden, "hidden");
+ copy_fs_field(btree, "btree");
+
+ if (!metadata_only) {
+ copy_fs_field(data, "data");
+ copy_fs_field(cached, "cached");
+ copy_fs_field(reserved, "reserved");
+ copy_fs_field(nr_inodes,"nr_inodes");
+
+ for (i = 0; i < BCH_REPLICAS_MAX; i++)
+ copy_fs_field(persistent_reserved[i],
+ "persistent_reserved[%i]", i);
+ }
+
+ for (i = 0; i < c->replicas.nr; i++) {
+ struct bch_replicas_entry *e =
+ cpu_replicas_entry(&c->replicas, i);
+
+ if (metadata_only &&
+ (e->data_type == BCH_DATA_user ||
+ e->data_type == BCH_DATA_cached))
+ continue;
+
+ printbuf_reset(&buf);
+ bch2_replicas_entry_to_text(&buf, e);
+
+ copy_fs_field(replicas[i], "%s", buf.buf);
+ }
+ }
+
+#undef copy_fs_field
+#undef copy_dev_field
+#undef copy_stripe_field
+#undef copy_field
+fsck_err:
+ if (ca)
+ percpu_ref_put(&ca->ref);
+ if (ret)
+ bch_err(c, "%s: ret %i", __func__, ret);
+
+ percpu_up_write(&c->mark_lock);
+ printbuf_exit(&buf);
+ return ret;
+}
+
+static int bch2_gc_start(struct bch_fs *c,
+ bool metadata_only)
+{
+ struct bch_dev *ca = NULL;
+ unsigned i;
+
+ BUG_ON(c->usage_gc);
+
+ c->usage_gc = __alloc_percpu_gfp(fs_usage_u64s(c) * sizeof(u64),
+ sizeof(u64), GFP_KERNEL);
+ if (!c->usage_gc) {
+ bch_err(c, "error allocating c->usage_gc");
+ return -ENOMEM;
+ }
+
+ for_each_member_device(ca, c, i) {
+ BUG_ON(ca->buckets_gc);
+ BUG_ON(ca->usage_gc);
+
+ ca->usage_gc = alloc_percpu(struct bch_dev_usage);
+ if (!ca->usage_gc) {
+ bch_err(c, "error allocating ca->usage_gc");
+ percpu_ref_put(&ca->ref);
+ return -ENOMEM;
+ }
+ }
+
+ return 0;
+}
+
+/* returns true if not equal */
+static inline bool bch2_alloc_v4_cmp(struct bch_alloc_v4 l,
+ struct bch_alloc_v4 r)
+{
+ return l.gen != r.gen ||
+ l.oldest_gen != r.oldest_gen ||
+ l.data_type != r.data_type ||
+ l.dirty_sectors != r.dirty_sectors ||
+ l.cached_sectors != r.cached_sectors ||
+ l.stripe_redundancy != r.stripe_redundancy ||
+ l.stripe != r.stripe;
+}
+
+static int bch2_alloc_write_key(struct btree_trans *trans,
+ struct btree_iter *iter,
+ bool metadata_only)
+{
+ struct bch_fs *c = trans->c;
+ struct bch_dev *ca = bch_dev_bkey_exists(c, iter->pos.inode);
+ struct bucket gc;
+ struct bkey_s_c k;
+ struct bkey_i_alloc_v4 *a;
+ struct bch_alloc_v4 old, new;
+ int ret;
+
+ k = bch2_btree_iter_peek_slot(iter);
+ ret = bkey_err(k);
+ if (ret)
+ return ret;
+
+ bch2_alloc_to_v4(k, &old);
+ new = old;
+
+ percpu_down_read(&c->mark_lock);
+ gc = *gc_bucket(ca, iter->pos.offset);
+ percpu_up_read(&c->mark_lock);
+
+ if (metadata_only &&
+ gc.data_type != BCH_DATA_sb &&
+ gc.data_type != BCH_DATA_journal &&
+ gc.data_type != BCH_DATA_btree)
+ return 0;
+
+ if (gen_after(old.gen, gc.gen))
+ return 0;
+
+#define copy_bucket_field(_f) \
+ if (fsck_err_on(new._f != gc._f, c, \
+ "bucket %llu:%llu gen %u data type %s has wrong " #_f \
+ ": got %u, should be %u", \
+ iter->pos.inode, iter->pos.offset, \
+ gc.gen, \
+ bch2_data_types[gc.data_type], \
+ new._f, gc._f)) \
+ new._f = gc._f; \
+
+ copy_bucket_field(gen);
+ copy_bucket_field(data_type);
+ copy_bucket_field(dirty_sectors);
+ copy_bucket_field(cached_sectors);
+ copy_bucket_field(stripe_redundancy);
+ copy_bucket_field(stripe);
+#undef copy_bucket_field
+
+ if (!bch2_alloc_v4_cmp(old, new))
+ return 0;
+
+ a = bch2_alloc_to_v4_mut(trans, k);
+ ret = PTR_ERR_OR_ZERO(a);
+ if (ret)
+ return ret;
+
+ a->v = new;
+
+ ret = bch2_trans_update(trans, iter, &a->k_i, BTREE_TRIGGER_NORUN);
+fsck_err:
+ return ret;
+}
+
+static int bch2_gc_alloc_done(struct bch_fs *c, bool metadata_only)
+{
+ struct btree_trans trans;
+ struct btree_iter iter;
+ struct bkey_s_c k;
+ struct bch_dev *ca;
+ unsigned i;
+ int ret = 0;
+
+ bch2_trans_init(&trans, c, 0, 0);
+
+ for_each_member_device(ca, c, i) {
+ for_each_btree_key(&trans, iter, BTREE_ID_alloc,
+ POS(ca->dev_idx, ca->mi.first_bucket),
+ BTREE_ITER_SLOTS|
+ BTREE_ITER_PREFETCH, k, ret) {
+ if (bkey_cmp(iter.pos, POS(ca->dev_idx, ca->mi.nbuckets)) >= 0)
+ break;
+
+ ret = __bch2_trans_do(&trans, NULL, NULL,
+ BTREE_INSERT_LAZY_RW,
+ bch2_alloc_write_key(&trans, &iter,
+ metadata_only));
+ if (ret)
+ break;
+ }
+ bch2_trans_iter_exit(&trans, &iter);
+
+ if (ret) {
+ bch_err(c, "error writing alloc info: %i", ret);
+ percpu_ref_put(&ca->ref);
+ break;
+ }
+ }
+
+ bch2_trans_exit(&trans);
+ return ret;
+}
+
+static int bch2_gc_alloc_start(struct bch_fs *c, bool metadata_only)
+{
+ struct bch_dev *ca;
+ struct btree_trans trans;
+ struct btree_iter iter;
+ struct bkey_s_c k;
+ struct bucket *g;
+ struct bch_alloc_v4 a;
+ unsigned i;
+ int ret;
+
+ for_each_member_device(ca, c, i) {
+ struct bucket_array *buckets = kvpmalloc(sizeof(struct bucket_array) +
+ ca->mi.nbuckets * sizeof(struct bucket),
+ GFP_KERNEL|__GFP_ZERO);
+ if (!buckets) {
+ percpu_ref_put(&ca->ref);
+ bch_err(c, "error allocating ca->buckets[gc]");
+ return -ENOMEM;
+ }
+
+ buckets->first_bucket = ca->mi.first_bucket;
+ buckets->nbuckets = ca->mi.nbuckets;
+ rcu_assign_pointer(ca->buckets_gc, buckets);
+ };