bcachefs-tools/libbcache/super-io.h

#ifndef _BCACHE_SUPER_IO_H
#define _BCACHE_SUPER_IO_H

#include "extents.h"
#include "super_types.h"

#include <asm/byteorder.h>

struct bch_sb_field *bch_sb_field_get(struct bch_sb *, enum bch_sb_field_types);

#define BCH_SB_FIELD_TYPE(_name)				\
static inline struct bch_sb_field_##_name *			\
bch_sb_get_##_name(struct bch_sb *sb)				\
{								\
	struct bch_sb_field *f =				\
		bch_sb_field_get(sb, BCH_SB_FIELD_##_name);	\
								\
	return container_of_or_null(f, struct bch_sb_field_##_name, field);\
}

BCH_SB_FIELD_TYPE(journal);
BCH_SB_FIELD_TYPE(members);
BCH_SB_FIELD_TYPE(crypt);

static inline bool bch_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 bch_sb_set_feature(struct bch_sb *sb,
				      enum bch_sb_features f)
{
	if (!bch_sb_test_feature(sb, f)) {
		unsigned w = f / 64;
		unsigned b = f % 64;

		le64_add_cpu(&sb->features[w], 1ULL << b);
	}
}

static inline __le64 bch_sb_magic(struct cache_set *c)
{
	__le64 ret;
	memcpy(&ret, &c->sb.uuid, sizeof(ret));
	return ret;
}

static inline __u64 jset_magic(struct cache_set *c)
{
	return __le64_to_cpu(bch_sb_magic(c) ^ JSET_MAGIC);
}

static inline __u64 pset_magic(struct cache_set *c)
{
	return __le64_to_cpu(bch_sb_magic(c) ^ PSET_MAGIC);
}

static inline __u64 bset_magic(struct cache_set *c)
{
	return __le64_to_cpu(bch_sb_magic(c) ^ BSET_MAGIC);
}

static inline struct cache_member_cpu cache_mi_to_cpu_mi(struct bch_member *mi)
{
	return (struct cache_member_cpu) {
		.nbuckets	= le64_to_cpu(mi->nbuckets),
		.first_bucket	= le16_to_cpu(mi->first_bucket),
		.bucket_size	= le16_to_cpu(mi->bucket_size),
		.state		= BCH_MEMBER_STATE(mi),
		.tier		= BCH_MEMBER_TIER(mi),
		.has_metadata	= BCH_MEMBER_HAS_METADATA(mi),
		.has_data	= BCH_MEMBER_HAS_DATA(mi),
		.replacement	= BCH_MEMBER_REPLACEMENT(mi),
		.discard	= BCH_MEMBER_DISCARD(mi),
		.valid		= !bch_is_zero(mi->uuid.b, sizeof(uuid_le)),
	};
}

int bch_cache_set_mi_update(struct cache_set *, struct bch_member *, unsigned);

int bch_sb_to_cache_set(struct cache_set *, struct bch_sb *);
int bch_sb_from_cache_set(struct cache_set *, struct cache *);

struct bch_sb_field *bch_fs_sb_field_resize(struct cache_set *,
				struct bch_sb_field *, unsigned);
struct bch_sb_field *bch_dev_sb_field_resize(struct bcache_superblock *,
				struct bch_sb_field *, unsigned);

void bch_free_super(struct bcache_superblock *);
int bch_super_realloc(struct bcache_superblock *, unsigned);

const char *bch_validate_cache_super(struct bcache_superblock *);

const char *bch_read_super(struct bcache_superblock *,
			   struct cache_set_opts, const char *);
void bch_write_super(struct cache_set *);

void bch_check_mark_super_slowpath(struct cache_set *,
				   const struct bkey_i *, bool);

#define cache_member_info_get(_c)					\
	(rcu_read_lock(), rcu_dereference((_c)->members))

#define cache_member_info_put()	rcu_read_unlock()

static inline bool bch_check_super_marked(struct cache_set *c,
					  const struct bkey_i *k, bool meta)
{
	struct bkey_s_c_extent e = bkey_i_to_s_c_extent(k);
	const struct bch_extent_ptr *ptr;
	struct cache_member_cpu *mi = cache_member_info_get(c)->m;
	bool ret = true;

	extent_for_each_ptr(e, ptr)
		if (!ptr->cached &&
		    !(meta
		      ? mi[ptr->dev].has_metadata
		      : mi[ptr->dev].has_data)) {
			ret = false;
			break;
		}

	cache_member_info_put();

	return ret;
}

static inline void bch_check_mark_super(struct cache_set *c,
					const struct bkey_i *k, bool meta)
{
	if (bch_check_super_marked(c, k, meta))
		return;

	bch_check_mark_super_slowpath(c, k, meta);
}

#endif /* _BCACHE_SUPER_IO_H */