bcachefs: New bucket sector count helpers

This introduces bch2_bucket_sectors() and bch2_bucket_sectors_dirty(),
prep work for separately accounting stripe sectors.
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

fs/bcachefs/alloc_background.c

@@ -261,10 +261,8 @@ int bch2_alloc_v4_invalid(struct bch_fs *c, struct bkey_s_c k,
 	case BCH_DATA_free:
 	case BCH_DATA_need_gc_gens:
 	case BCH_DATA_need_discard:
-		bkey_fsck_err_on(a.v->dirty_sectors ||
-				 a.v->cached_sectors ||
-				 a.v->stripe, c, err,
-				 alloc_key_empty_but_have_data,
+		bkey_fsck_err_on(bch2_bucket_sectors(*a.v) || a.v->stripe,
+				 c, err, alloc_key_empty_but_have_data,
 				 "empty data type free but have data");
 		break;
 	case BCH_DATA_sb:
@@ -272,22 +270,21 @@ int bch2_alloc_v4_invalid(struct bch_fs *c, struct bkey_s_c k,
 	case BCH_DATA_btree:
 	case BCH_DATA_user:
 	case BCH_DATA_parity:
-		bkey_fsck_err_on(!a.v->dirty_sectors, c, err,
-				 alloc_key_dirty_sectors_0,
+		bkey_fsck_err_on(!bch2_bucket_sectors_dirty(*a.v),
+				 c, err, alloc_key_dirty_sectors_0,
 				 "data_type %s but dirty_sectors==0",
 				 bch2_data_types[a.v->data_type]);
 		break;
 	case BCH_DATA_cached:
 		bkey_fsck_err_on(!a.v->cached_sectors ||
-				 a.v->dirty_sectors ||
-				 a.v->stripe, c, err,
-				 alloc_key_cached_inconsistency,
+				 bch2_bucket_sectors_dirty(*a.v) ||
+				 a.v->stripe,
+				 c, err, alloc_key_cached_inconsistency,
 				 "data type inconsistency");
 
 		bkey_fsck_err_on(!a.v->io_time[READ] &&
 				 c->curr_recovery_pass > BCH_RECOVERY_PASS_check_alloc_to_lru_refs,
-				 c, err,
-				 alloc_key_cached_but_read_time_zero,
+				 c, err, alloc_key_cached_but_read_time_zero,
 				 "cached bucket with read_time == 0");
 		break;
 	case BCH_DATA_stripe:
@@ -790,8 +787,7 @@ int bch2_trans_mark_alloc(struct btree_trans *trans,
 
 	new_a->data_type = alloc_data_type(*new_a, new_a->data_type);
 
-	if (new_a->dirty_sectors > old_a->dirty_sectors ||
-	    new_a->cached_sectors > old_a->cached_sectors) {
+	if (bch2_bucket_sectors(*new_a) > bch2_bucket_sectors(*old_a)) {
 		new_a->io_time[READ] = max_t(u64, 1, atomic64_read(&c->io_clock[READ].now));
 		new_a->io_time[WRITE]= max_t(u64, 1, atomic64_read(&c->io_clock[WRITE].now));
 		SET_BCH_ALLOC_V4_NEED_INC_GEN(new_a, true);

fs/bcachefs/alloc_background.h

@@ -71,6 +71,24 @@ static inline enum bch_data_type bucket_data_type(enum bch_data_type data_type)
 	return data_type == BCH_DATA_stripe ? BCH_DATA_user : data_type;
 }
 
+static inline unsigned bch2_bucket_sectors(struct bch_alloc_v4 a)
+{
+	return a.dirty_sectors + a.cached_sectors;
+}
+
+static inline unsigned bch2_bucket_sectors_dirty(struct bch_alloc_v4 a)
+{
+	return a.dirty_sectors;
+}
+
+static inline unsigned bch2_bucket_sectors_fragmented(struct bch_dev *ca,
+						 struct bch_alloc_v4 a)
+{
+	int d = bch2_bucket_sectors_dirty(a);
+
+	return d ? max(0, ca->mi.bucket_size - d) : 0;
+}
+
 static inline u64 alloc_lru_idx_read(struct bch_alloc_v4 a)
 {
 	return a.data_type == BCH_DATA_cached ? a.io_time[READ] : 0;
@@ -90,10 +108,11 @@ static inline u64 alloc_lru_idx_fragmentation(struct bch_alloc_v4 a,
 					      struct bch_dev *ca)
 {
 	if (!data_type_movable(a.data_type) ||
-	    a.dirty_sectors >= ca->mi.bucket_size)
+	    !bch2_bucket_sectors_fragmented(ca, a))
 		return 0;
 
-	return div_u64((u64) a.dirty_sectors * (1ULL << 31), ca->mi.bucket_size);
+	u64 d = bch2_bucket_sectors_dirty(a);
+	return div_u64(d * (1ULL << 31), ca->mi.bucket_size);
 }
 
 static inline u64 alloc_freespace_genbits(struct bch_alloc_v4 a)

fs/bcachefs/buckets.c

@@ -277,14 +277,6 @@ void bch2_dev_usage_init(struct bch_dev *ca)
 	ca->usage_base->d[BCH_DATA_free].buckets = ca->mi.nbuckets - ca->mi.first_bucket;
 }
 
-static inline int bucket_sectors_fragmented(struct bch_dev *ca,
-					    struct bch_alloc_v4 a)
-{
-	return a.dirty_sectors
-		? max(0, (int) ca->mi.bucket_size - (int) a.dirty_sectors)
-		: 0;
-}
-
 static void bch2_dev_usage_update(struct bch_fs *c, struct bch_dev *ca,
 				  struct bch_alloc_v4 old,
 				  struct bch_alloc_v4 new,
@@ -306,41 +298,40 @@ static void bch2_dev_usage_update(struct bch_fs *c, struct bch_dev *ca,
 	u->d[old.data_type].buckets--;
 	u->d[new.data_type].buckets++;
 
-	u->buckets_ec -= (int) !!old.stripe;
-	u->buckets_ec += (int) !!new.stripe;
+	u->buckets_ec -= !!old.stripe;
+	u->buckets_ec += !!new.stripe;
 
-	u->d[old.data_type].sectors -= old.dirty_sectors;
-	u->d[new.data_type].sectors += new.dirty_sectors;
+	u->d[old.data_type].sectors -= bch2_bucket_sectors_dirty(old);
+	u->d[new.data_type].sectors += bch2_bucket_sectors_dirty(new);
 
 	u->d[BCH_DATA_cached].sectors += new.cached_sectors;
 	u->d[BCH_DATA_cached].sectors -= old.cached_sectors;
 
-	u->d[old.data_type].fragmented -= bucket_sectors_fragmented(ca, old);
-	u->d[new.data_type].fragmented += bucket_sectors_fragmented(ca, new);
+	u->d[old.data_type].fragmented -= bch2_bucket_sectors_fragmented(ca, old);
+	u->d[new.data_type].fragmented += bch2_bucket_sectors_fragmented(ca, new);
 
 	preempt_enable();
 }
 
+static inline struct bch_alloc_v4 bucket_m_to_alloc(struct bucket b)
+{
+	return (struct bch_alloc_v4) {
+		.gen		= b.gen,
+		.data_type	= b.data_type,
+		.dirty_sectors	= b.dirty_sectors,
+		.cached_sectors	= b.cached_sectors,
+		.stripe		= b.stripe,
+	};
+}
+
 static void bch2_dev_usage_update_m(struct bch_fs *c, struct bch_dev *ca,
 				    struct bucket old, struct bucket new,
 				    u64 journal_seq, bool gc)
 {
-	struct bch_alloc_v4 old_a = {
-		.gen		= old.gen,
-		.data_type	= old.data_type,
-		.dirty_sectors	= old.dirty_sectors,
-		.cached_sectors	= old.cached_sectors,
-		.stripe		= old.stripe,
-	};
-	struct bch_alloc_v4 new_a = {
-		.gen		= new.gen,
-		.data_type	= new.data_type,
-		.dirty_sectors	= new.dirty_sectors,
-		.cached_sectors	= new.cached_sectors,
-		.stripe		= new.stripe,
-	};
-
-	bch2_dev_usage_update(c, ca, old_a, new_a, journal_seq, gc);
+	bch2_dev_usage_update(c, ca,
+			      bucket_m_to_alloc(old),
+			      bucket_m_to_alloc(new),
+			      journal_seq, gc);
 }
 
 static inline int __update_replicas(struct bch_fs *c,
@@ -640,7 +631,6 @@ int bch2_mark_metadata_bucket(struct bch_fs *c, struct bch_dev *ca,
 		goto err;
 	}
 
-
 	g->data_type = data_type;
 	g->dirty_sectors += sectors;
 	new = *g;

fs/bcachefs/move.c

@@ -677,7 +677,7 @@ int __bch2_evacuate_bucket(struct moving_context *ctxt,
 	}
 
 	a = bch2_alloc_to_v4(k, &a_convert);
-	dirty_sectors = a->dirty_sectors;
+	dirty_sectors = bch2_bucket_sectors_dirty(*a);
 	bucket_size = bch_dev_bkey_exists(c, bucket.inode)->mi.bucket_size;
 	fragmentation = a->fragmentation_lru;
 

fs/bcachefs/movinggc.c

@@ -91,7 +91,7 @@ static int bch2_bucket_is_movable(struct btree_trans *trans,
 
 	a = bch2_alloc_to_v4(k, &_a);
 	b->k.gen	= a->gen;
-	b->sectors	= a->dirty_sectors;
+	b->sectors	= bch2_bucket_sectors_dirty(*a);
 
 	ret = data_type_movable(a->data_type) &&
 		a->fragmentation_lru &&