bcachefs: bch_acct_snapshot

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

Author: Kent Overstreet

fs/bcachefs/buckets.c

@@ -778,6 +778,16 @@ static int __trigger_extent(struct btree_trans *trans,
 			return ret;
 	}
 
+	if (acc_replicas_key.replicas.nr_devs && !level && k.k->p.snapshot) {
+		struct disk_accounting_pos acc_snapshot_key = {
+			.type			= BCH_DISK_ACCOUNTING_snapshot,
+			.snapshot.id		= k.k->p.snapshot,
+		};
+		ret = bch2_disk_accounting_mod(trans, &acc_snapshot_key, &replicas_sectors, 1, gc);
+		if (ret)
+			return ret;
+	}
+
 	if (acct_compression_key.compression.type) {
 		if (flags & BTREE_TRIGGER_overwrite)
 			bch2_u64s_neg(compression_acct, ARRAY_SIZE(compression_acct));

fs/bcachefs/disk_accounting.c

@@ -146,6 +146,9 @@ void bch2_accounting_key_to_text(struct printbuf *out, struct disk_accounting_po
 	case BCH_DISK_ACCOUNTING_compression:
 		bch2_prt_compression_type(out, k->compression.type);
 		break;
+	case BCH_DISK_ACCOUNTING_snapshot:
+		prt_printf(out, "id=%u", k->snapshot.id);
+		break;
 	}
 }
 

fs/bcachefs/disk_accounting_format.h

@@ -100,7 +100,8 @@ static inline bool data_type_is_hidden(enum bch_data_type type)
 	x(persistent_reserved,	1)		\
 	x(replicas,		2)		\
 	x(dev_data_type,	3)		\
-	x(compression,		4)
+	x(compression,		4)		\
+	x(snapshot,		5)
 
 enum disk_accounting_type {
 #define x(f, nr)	BCH_DISK_ACCOUNTING_##f	= nr,
@@ -129,6 +130,10 @@ struct bch_acct_compression {
 	__u8			type;
 };
 
+struct bch_acct_snapshot {
+	__u32			id;
+};
+
 struct disk_accounting_pos {
 	union {
 	struct {
@@ -140,6 +145,7 @@ struct disk_accounting_pos {
 		struct bch_dev_data_type	dev_data_type;
 		struct bch_dev_stripe_buckets	dev_stripe_buckets;
 		struct bch_acct_compression	compression;
+		struct bch_acct_snapshot	snapshot;
 		};
 	};
 		struct bpos			_pad;