1 files changed, 142 insertions, 0 deletions
diff --git a/fs/bcachefs/super-io.h b/fs/bcachefs/super-io.h
new file mode 100644
index 000000000000..1ea91f71f3b0
--- /dev/null
+++ b/fs/bcachefs/super-io.h
@@ -0,0 +1,142 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _BCACHEFS_SUPER_IO_H
+#define _BCACHEFS_SUPER_IO_H
+
+#include "extents.h"
+#include "eytzinger.h"
+#include "super_types.h"
+#include "super.h"
+
+#include <asm/byteorder.h>
+
+struct bch_sb_field *bch2_sb_field_get(struct bch_sb *, enum bch_sb_field_type);
+struct bch_sb_field *bch2_sb_field_resize(struct bch_sb_handle *,
+					  enum bch_sb_field_type, unsigned);
+
+#define field_to_type(_f, _name)					\
+	container_of_or_null(_f, struct bch_sb_field_##_name, field)
+
+#define x(_name, _nr)							\
+static inline struct bch_sb_field_##_name *				\
+bch2_sb_get_##_name(struct bch_sb *sb)					\
+{									\
+	return field_to_type(bch2_sb_field_get(sb,			\
+				BCH_SB_FIELD_##_name), _name);		\
+}									\
+									\
+static inline struct bch_sb_field_##_name *				\
+bch2_sb_resize_##_name(struct bch_sb_handle *sb, unsigned u64s)	\
+{									\
+	return field_to_type(bch2_sb_field_resize(sb,			\
+				BCH_SB_FIELD_##_name, u64s), _name);	\
+}
+
+BCH_SB_FIELDS()
+#undef x
+
+extern const char * const bch2_sb_fields[];
+
+struct bch_sb_field_ops {
+	const char *	(*validate)(struct bch_sb *, struct bch_sb_field *);
+	size_t		(*to_text)(char *, size_t, struct bch_sb *,
+				   struct bch_sb_field *);
+};
+
+static inline bool bch2_sb_test_feature(struct bch_sb *sb,
+					enum bch_sb_features f)
+{
+	unsigned w = f / 64;
+	unsigned b = f % 64;
+
+	return le64_to_cpu(sb->features[w]) & (1ULL << b);
+}
+
+static inline void bch2_sb_set_feature(struct bch_sb *sb,
+				       enum bch_sb_features f)
+{
+	if (!bch2_sb_test_feature(sb, f)) {
+		unsigned w = f / 64;
+		unsigned b = f % 64;
+
+		le64_add_cpu(&sb->features[w], 1ULL << b);
+	}
+}
+
+static inline __le64 bch2_sb_magic(struct bch_fs *c)
+{
+	__le64 ret;
+	memcpy(&ret, &c->sb.uuid, sizeof(ret));
+	return ret;
+}
+
+static inline __u64 jset_magic(struct bch_fs *c)
+{
+	return __le64_to_cpu(bch2_sb_magic(c) ^ JSET_MAGIC);
+}
+
+static inline __u64 bset_magic(struct bch_fs *c)
+{
+	return __le64_to_cpu(bch2_sb_magic(c) ^ BSET_MAGIC);
+}
+
+int bch2_sb_to_fs(struct bch_fs *, struct bch_sb *);
+int bch2_sb_from_fs(struct bch_fs *, struct bch_dev *);
+
+void bch2_free_super(struct bch_sb_handle *);
+int bch2_sb_realloc(struct bch_sb_handle *, unsigned);
+
+const char *bch2_sb_validate(struct bch_sb_handle *);
+
+int bch2_read_super(const char *, struct bch_opts *, struct bch_sb_handle *);
+void bch2_write_super(struct bch_fs *);
+
+/* BCH_SB_FIELD_journal: */
+
+static inline unsigned bch2_nr_journal_buckets(struct bch_sb_field_journal *j)
+{
+	return j
+		? (__le64 *) vstruct_end(&j->field) - j->buckets
+		: 0;
+}
+
+/* BCH_SB_FIELD_members: */
+
+static inline bool bch2_member_exists(struct bch_member *m)
+{
+	return !bch2_is_zero(&m->uuid, sizeof(m->uuid));
+}
+
+static inline bool bch2_dev_exists(struct bch_sb *sb,
+				   struct bch_sb_field_members *mi,
+				   unsigned dev)
+{
+	return dev < sb->nr_devices &&
+		bch2_member_exists(&mi->members[dev]);
+}
+
+static inline struct bch_member_cpu bch2_mi_to_cpu(struct bch_member *mi)
+{
+	return (struct bch_member_cpu) {
+		.nbuckets	= le64_to_cpu(mi->nbuckets),
+		.first_bucket	= le16_to_cpu(mi->first_bucket),
+		.bucket_size	= le16_to_cpu(mi->bucket_size),
+		.group		= BCH_MEMBER_GROUP(mi),
+		.state		= BCH_MEMBER_STATE(mi),
+		.replacement	= BCH_MEMBER_REPLACEMENT(mi),
+		.discard	= BCH_MEMBER_DISCARD(mi),
+		.data_allowed	= BCH_MEMBER_DATA_ALLOWED(mi),
+		.durability	= BCH_MEMBER_DURABILITY(mi)
+			? BCH_MEMBER_DURABILITY(mi) - 1
+			: 1,
+		.valid		= bch2_member_exists(mi),
+	};
+}
+
+/* BCH_SB_FIELD_clean: */
+
+void bch2_fs_mark_clean(struct bch_fs *, bool);
+
+size_t bch2_sb_field_to_text(char *, size_t, struct bch_sb *,
+			     struct bch_sb_field *);
+
+#endif /* _BCACHEFS_SUPER_IO_H */