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Diffstat (limited to 'fs/bcachefs/bkey_types.h')
| -rw-r--r-- | fs/bcachefs/bkey_types.h | 213 |
1 files changed, 213 insertions, 0 deletions
diff --git a/fs/bcachefs/bkey_types.h b/fs/bcachefs/bkey_types.h new file mode 100644 index 000000000000..c9ae9e42b385 --- /dev/null +++ b/fs/bcachefs/bkey_types.h @@ -0,0 +1,213 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _BCACHEFS_BKEY_TYPES_H +#define _BCACHEFS_BKEY_TYPES_H + +#include "bcachefs_format.h" + +/* + * bkey_i - bkey with inline value + * bkey_s - bkey with split value + * bkey_s_c - bkey with split value, const + */ + +#define bkey_p_next(_k) vstruct_next(_k) + +static inline struct bkey_i *bkey_next(struct bkey_i *k) +{ + return (struct bkey_i *) ((u64 *) k->_data + k->k.u64s); +} + +#define bkey_val_u64s(_k) ((_k)->u64s - BKEY_U64s) + +static inline size_t bkey_val_bytes(const struct bkey *k) +{ + return bkey_val_u64s(k) * sizeof(u64); +} + +static inline void set_bkey_val_u64s(struct bkey *k, unsigned val_u64s) +{ + unsigned u64s = BKEY_U64s + val_u64s; + + BUG_ON(u64s > U8_MAX); + k->u64s = u64s; +} + +static inline void set_bkey_val_bytes(struct bkey *k, unsigned bytes) +{ + set_bkey_val_u64s(k, DIV_ROUND_UP(bytes, sizeof(u64))); +} + +#define bkey_val_end(_k) ((void *) (((u64 *) (_k).v) + bkey_val_u64s((_k).k))) + +#define bkey_deleted(_k) ((_k)->type == KEY_TYPE_deleted) + +#define bkey_whiteout(_k) \ + ((_k)->type == KEY_TYPE_deleted || (_k)->type == KEY_TYPE_whiteout) + +/* bkey with split value, const */ +struct bkey_s_c { + const struct bkey *k; + const struct bch_val *v; +}; + +/* bkey with split value */ +struct bkey_s { + union { + struct { + struct bkey *k; + struct bch_val *v; + }; + struct bkey_s_c s_c; + }; +}; + +#define bkey_s_null ((struct bkey_s) { .k = NULL }) +#define bkey_s_c_null ((struct bkey_s_c) { .k = NULL }) + +#define bkey_s_err(err) ((struct bkey_s) { .k = ERR_PTR(err) }) +#define bkey_s_c_err(err) ((struct bkey_s_c) { .k = ERR_PTR(err) }) + +static inline struct bkey_s bkey_to_s(struct bkey *k) +{ + return (struct bkey_s) { .k = k, .v = NULL }; +} + +static inline struct bkey_s_c bkey_to_s_c(const struct bkey *k) +{ + return (struct bkey_s_c) { .k = k, .v = NULL }; +} + +static inline struct bkey_s bkey_i_to_s(struct bkey_i *k) +{ + return (struct bkey_s) { .k = &k->k, .v = &k->v }; +} + +static inline struct bkey_s_c bkey_i_to_s_c(const struct bkey_i *k) +{ + return (struct bkey_s_c) { .k = &k->k, .v = &k->v }; +} + +/* + * For a given type of value (e.g. struct bch_extent), generates the types for + * bkey + bch_extent - inline, split, split const - and also all the conversion + * functions, which also check that the value is of the correct type. + * + * We use anonymous unions for upcasting - e.g. converting from e.g. a + * bkey_i_extent to a bkey_i - since that's always safe, instead of conversion + * functions. + */ +#define x(name, ...) \ +struct bkey_i_##name { \ + union { \ + struct bkey k; \ + struct bkey_i k_i; \ + }; \ + struct bch_##name v; \ +}; \ + \ +struct bkey_s_c_##name { \ + union { \ + struct { \ + const struct bkey *k; \ + const struct bch_##name *v; \ + }; \ + struct bkey_s_c s_c; \ + }; \ +}; \ + \ +struct bkey_s_##name { \ + union { \ + struct { \ + struct bkey *k; \ + struct bch_##name *v; \ + }; \ + struct bkey_s_c_##name c; \ + struct bkey_s s; \ + struct bkey_s_c s_c; \ + }; \ +}; \ + \ +static inline struct bkey_i_##name *bkey_i_to_##name(struct bkey_i *k) \ +{ \ + EBUG_ON(!IS_ERR_OR_NULL(k) && k->k.type != KEY_TYPE_##name); \ + return container_of(&k->k, struct bkey_i_##name, k); \ +} \ + \ +static inline const struct bkey_i_##name * \ +bkey_i_to_##name##_c(const struct bkey_i *k) \ +{ \ + EBUG_ON(!IS_ERR_OR_NULL(k) && k->k.type != KEY_TYPE_##name); \ + return container_of(&k->k, struct bkey_i_##name, k); \ +} \ + \ +static inline struct bkey_s_##name bkey_s_to_##name(struct bkey_s k) \ +{ \ + EBUG_ON(!IS_ERR_OR_NULL(k.k) && k.k->type != KEY_TYPE_##name); \ + return (struct bkey_s_##name) { \ + .k = k.k, \ + .v = container_of(k.v, struct bch_##name, v), \ + }; \ +} \ + \ +static inline struct bkey_s_c_##name bkey_s_c_to_##name(struct bkey_s_c k)\ +{ \ + EBUG_ON(!IS_ERR_OR_NULL(k.k) && k.k->type != KEY_TYPE_##name); \ + return (struct bkey_s_c_##name) { \ + .k = k.k, \ + .v = container_of(k.v, struct bch_##name, v), \ + }; \ +} \ + \ +static inline struct bkey_s_##name name##_i_to_s(struct bkey_i_##name *k)\ +{ \ + return (struct bkey_s_##name) { \ + .k = &k->k, \ + .v = &k->v, \ + }; \ +} \ + \ +static inline struct bkey_s_c_##name \ +name##_i_to_s_c(const struct bkey_i_##name *k) \ +{ \ + return (struct bkey_s_c_##name) { \ + .k = &k->k, \ + .v = &k->v, \ + }; \ +} \ + \ +static inline struct bkey_s_##name bkey_i_to_s_##name(struct bkey_i *k) \ +{ \ + EBUG_ON(!IS_ERR_OR_NULL(k) && k->k.type != KEY_TYPE_##name); \ + return (struct bkey_s_##name) { \ + .k = &k->k, \ + .v = container_of(&k->v, struct bch_##name, v), \ + }; \ +} \ + \ +static inline struct bkey_s_c_##name \ +bkey_i_to_s_c_##name(const struct bkey_i *k) \ +{ \ + EBUG_ON(!IS_ERR_OR_NULL(k) && k->k.type != KEY_TYPE_##name); \ + return (struct bkey_s_c_##name) { \ + .k = &k->k, \ + .v = container_of(&k->v, struct bch_##name, v), \ + }; \ +} \ + \ +static inline struct bkey_i_##name *bkey_##name##_init(struct bkey_i *_k)\ +{ \ + struct bkey_i_##name *k = \ + container_of(&_k->k, struct bkey_i_##name, k); \ + \ + bkey_init(&k->k); \ + memset(&k->v, 0, sizeof(k->v)); \ + k->k.type = KEY_TYPE_##name; \ + set_bkey_val_bytes(&k->k, sizeof(k->v)); \ + \ + return k; \ +} + +BCH_BKEY_TYPES(); +#undef x + +#endif /* _BCACHEFS_BKEY_TYPES_H */ |