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613 lines
15 KiB
C
613 lines
15 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _BCACHEFS_BKEY_H
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#define _BCACHEFS_BKEY_H
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#include <linux/bug.h>
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#include "bcachefs_format.h"
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#include "bkey_types.h"
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#include "btree_types.h"
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#include "util.h"
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#include "vstructs.h"
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enum bch_validate_flags {
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BCH_VALIDATE_write = BIT(0),
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BCH_VALIDATE_commit = BIT(1),
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BCH_VALIDATE_journal = BIT(2),
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BCH_VALIDATE_silent = BIT(3),
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};
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#if 0
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/*
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* compiled unpack functions are disabled, pending a new interface for
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* dynamically allocating executable memory:
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*/
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#ifdef CONFIG_X86_64
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#define HAVE_BCACHEFS_COMPILED_UNPACK 1
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#endif
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#endif
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void bch2_bkey_packed_to_binary_text(struct printbuf *,
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const struct bkey_format *,
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const struct bkey_packed *);
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enum bkey_lr_packed {
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BKEY_PACKED_BOTH,
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BKEY_PACKED_RIGHT,
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BKEY_PACKED_LEFT,
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BKEY_PACKED_NONE,
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};
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#define bkey_lr_packed(_l, _r) \
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((_l)->format + ((_r)->format << 1))
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static inline void bkey_p_copy(struct bkey_packed *dst, const struct bkey_packed *src)
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{
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memcpy_u64s_small(dst, src, src->u64s);
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}
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static inline void bkey_copy(struct bkey_i *dst, const struct bkey_i *src)
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{
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memcpy_u64s_small(dst, src, src->k.u64s);
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}
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struct btree;
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__pure
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unsigned bch2_bkey_greatest_differing_bit(const struct btree *,
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const struct bkey_packed *,
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const struct bkey_packed *);
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__pure
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unsigned bch2_bkey_ffs(const struct btree *, const struct bkey_packed *);
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__pure
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int __bch2_bkey_cmp_packed_format_checked(const struct bkey_packed *,
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const struct bkey_packed *,
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const struct btree *);
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__pure
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int __bch2_bkey_cmp_left_packed_format_checked(const struct btree *,
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const struct bkey_packed *,
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const struct bpos *);
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__pure
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int bch2_bkey_cmp_packed(const struct btree *,
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const struct bkey_packed *,
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const struct bkey_packed *);
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__pure
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int __bch2_bkey_cmp_left_packed(const struct btree *,
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const struct bkey_packed *,
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const struct bpos *);
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static inline __pure
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int bkey_cmp_left_packed(const struct btree *b,
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const struct bkey_packed *l, const struct bpos *r)
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{
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return __bch2_bkey_cmp_left_packed(b, l, r);
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}
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/*
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* The compiler generates better code when we pass bpos by ref, but it's often
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* enough terribly convenient to pass it by val... as much as I hate c++, const
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* ref would be nice here:
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*/
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__pure __flatten
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static inline int bkey_cmp_left_packed_byval(const struct btree *b,
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const struct bkey_packed *l,
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struct bpos r)
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{
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return bkey_cmp_left_packed(b, l, &r);
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}
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static __always_inline bool bpos_eq(struct bpos l, struct bpos r)
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{
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return !((l.inode ^ r.inode) |
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(l.offset ^ r.offset) |
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(l.snapshot ^ r.snapshot));
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}
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static __always_inline bool bpos_lt(struct bpos l, struct bpos r)
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{
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return l.inode != r.inode ? l.inode < r.inode :
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l.offset != r.offset ? l.offset < r.offset :
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l.snapshot != r.snapshot ? l.snapshot < r.snapshot : false;
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}
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static __always_inline bool bpos_le(struct bpos l, struct bpos r)
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{
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return l.inode != r.inode ? l.inode < r.inode :
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l.offset != r.offset ? l.offset < r.offset :
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l.snapshot != r.snapshot ? l.snapshot < r.snapshot : true;
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}
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static __always_inline bool bpos_gt(struct bpos l, struct bpos r)
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{
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return bpos_lt(r, l);
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}
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static __always_inline bool bpos_ge(struct bpos l, struct bpos r)
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{
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return bpos_le(r, l);
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}
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static __always_inline int bpos_cmp(struct bpos l, struct bpos r)
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{
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return cmp_int(l.inode, r.inode) ?:
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cmp_int(l.offset, r.offset) ?:
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cmp_int(l.snapshot, r.snapshot);
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}
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static inline struct bpos bpos_min(struct bpos l, struct bpos r)
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{
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return bpos_lt(l, r) ? l : r;
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}
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static inline struct bpos bpos_max(struct bpos l, struct bpos r)
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{
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return bpos_gt(l, r) ? l : r;
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}
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static __always_inline bool bkey_eq(struct bpos l, struct bpos r)
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{
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return !((l.inode ^ r.inode) |
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(l.offset ^ r.offset));
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}
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static __always_inline bool bkey_lt(struct bpos l, struct bpos r)
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{
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return l.inode != r.inode
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? l.inode < r.inode
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: l.offset < r.offset;
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}
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static __always_inline bool bkey_le(struct bpos l, struct bpos r)
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{
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return l.inode != r.inode
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? l.inode < r.inode
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: l.offset <= r.offset;
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}
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static __always_inline bool bkey_gt(struct bpos l, struct bpos r)
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{
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return bkey_lt(r, l);
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}
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static __always_inline bool bkey_ge(struct bpos l, struct bpos r)
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{
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return bkey_le(r, l);
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}
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static __always_inline int bkey_cmp(struct bpos l, struct bpos r)
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{
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return cmp_int(l.inode, r.inode) ?:
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cmp_int(l.offset, r.offset);
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}
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static inline struct bpos bkey_min(struct bpos l, struct bpos r)
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{
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return bkey_lt(l, r) ? l : r;
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}
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static inline struct bpos bkey_max(struct bpos l, struct bpos r)
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{
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return bkey_gt(l, r) ? l : r;
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}
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static inline bool bkey_and_val_eq(struct bkey_s_c l, struct bkey_s_c r)
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{
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return bpos_eq(l.k->p, r.k->p) &&
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bkey_bytes(l.k) == bkey_bytes(r.k) &&
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!memcmp(l.v, r.v, bkey_val_bytes(l.k));
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}
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void bch2_bpos_swab(struct bpos *);
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void bch2_bkey_swab_key(const struct bkey_format *, struct bkey_packed *);
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static __always_inline int bversion_cmp(struct bversion l, struct bversion r)
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{
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return cmp_int(l.hi, r.hi) ?:
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cmp_int(l.lo, r.lo);
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}
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#define ZERO_VERSION ((struct bversion) { .hi = 0, .lo = 0 })
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#define MAX_VERSION ((struct bversion) { .hi = ~0, .lo = ~0ULL })
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static __always_inline bool bversion_zero(struct bversion v)
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{
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return bversion_cmp(v, ZERO_VERSION) == 0;
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}
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#ifdef CONFIG_BCACHEFS_DEBUG
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/* statement expressions confusing unlikely()? */
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#define bkey_packed(_k) \
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({ EBUG_ON((_k)->format > KEY_FORMAT_CURRENT); \
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(_k)->format != KEY_FORMAT_CURRENT; })
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#else
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#define bkey_packed(_k) ((_k)->format != KEY_FORMAT_CURRENT)
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#endif
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/*
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* It's safe to treat an unpacked bkey as a packed one, but not the reverse
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*/
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static inline struct bkey_packed *bkey_to_packed(struct bkey_i *k)
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{
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return (struct bkey_packed *) k;
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}
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static inline const struct bkey_packed *bkey_to_packed_c(const struct bkey_i *k)
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{
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return (const struct bkey_packed *) k;
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}
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static inline struct bkey_i *packed_to_bkey(struct bkey_packed *k)
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{
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return bkey_packed(k) ? NULL : (struct bkey_i *) k;
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}
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static inline const struct bkey *packed_to_bkey_c(const struct bkey_packed *k)
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{
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return bkey_packed(k) ? NULL : (const struct bkey *) k;
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}
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static inline unsigned bkey_format_key_bits(const struct bkey_format *format)
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{
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return format->bits_per_field[BKEY_FIELD_INODE] +
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format->bits_per_field[BKEY_FIELD_OFFSET] +
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format->bits_per_field[BKEY_FIELD_SNAPSHOT];
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}
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static inline struct bpos bpos_successor(struct bpos p)
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{
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if (!++p.snapshot &&
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!++p.offset &&
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!++p.inode)
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BUG();
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return p;
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}
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static inline struct bpos bpos_predecessor(struct bpos p)
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{
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if (!p.snapshot-- &&
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!p.offset-- &&
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!p.inode--)
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BUG();
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return p;
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}
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static inline struct bpos bpos_nosnap_successor(struct bpos p)
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{
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p.snapshot = 0;
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if (!++p.offset &&
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!++p.inode)
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BUG();
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return p;
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}
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static inline struct bpos bpos_nosnap_predecessor(struct bpos p)
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{
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p.snapshot = 0;
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if (!p.offset-- &&
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!p.inode--)
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BUG();
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return p;
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}
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static inline u64 bkey_start_offset(const struct bkey *k)
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{
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return k->p.offset - k->size;
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}
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static inline struct bpos bkey_start_pos(const struct bkey *k)
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{
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return (struct bpos) {
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.inode = k->p.inode,
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.offset = bkey_start_offset(k),
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.snapshot = k->p.snapshot,
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};
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}
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/* Packed helpers */
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static inline unsigned bkeyp_key_u64s(const struct bkey_format *format,
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const struct bkey_packed *k)
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{
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return bkey_packed(k) ? format->key_u64s : BKEY_U64s;
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}
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static inline bool bkeyp_u64s_valid(const struct bkey_format *f,
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const struct bkey_packed *k)
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{
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return ((unsigned) k->u64s - bkeyp_key_u64s(f, k) <= U8_MAX - BKEY_U64s);
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}
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static inline unsigned bkeyp_key_bytes(const struct bkey_format *format,
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const struct bkey_packed *k)
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{
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return bkeyp_key_u64s(format, k) * sizeof(u64);
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}
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static inline unsigned bkeyp_val_u64s(const struct bkey_format *format,
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const struct bkey_packed *k)
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{
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return k->u64s - bkeyp_key_u64s(format, k);
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}
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static inline size_t bkeyp_val_bytes(const struct bkey_format *format,
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const struct bkey_packed *k)
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{
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return bkeyp_val_u64s(format, k) * sizeof(u64);
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}
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static inline void set_bkeyp_val_u64s(const struct bkey_format *format,
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struct bkey_packed *k, unsigned val_u64s)
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{
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k->u64s = bkeyp_key_u64s(format, k) + val_u64s;
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}
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#define bkeyp_val(_format, _k) \
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((struct bch_val *) ((u64 *) (_k)->_data + bkeyp_key_u64s(_format, _k)))
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extern const struct bkey_format bch2_bkey_format_current;
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bool bch2_bkey_transform(const struct bkey_format *,
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struct bkey_packed *,
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const struct bkey_format *,
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const struct bkey_packed *);
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struct bkey __bch2_bkey_unpack_key(const struct bkey_format *,
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const struct bkey_packed *);
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#ifndef HAVE_BCACHEFS_COMPILED_UNPACK
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struct bpos __bkey_unpack_pos(const struct bkey_format *,
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const struct bkey_packed *);
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#endif
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bool bch2_bkey_pack_key(struct bkey_packed *, const struct bkey *,
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const struct bkey_format *);
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enum bkey_pack_pos_ret {
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BKEY_PACK_POS_EXACT,
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BKEY_PACK_POS_SMALLER,
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BKEY_PACK_POS_FAIL,
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};
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enum bkey_pack_pos_ret bch2_bkey_pack_pos_lossy(struct bkey_packed *, struct bpos,
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const struct btree *);
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static inline bool bkey_pack_pos(struct bkey_packed *out, struct bpos in,
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const struct btree *b)
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{
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return bch2_bkey_pack_pos_lossy(out, in, b) == BKEY_PACK_POS_EXACT;
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}
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void bch2_bkey_unpack(const struct btree *, struct bkey_i *,
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const struct bkey_packed *);
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bool bch2_bkey_pack(struct bkey_packed *, const struct bkey_i *,
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const struct bkey_format *);
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typedef void (*compiled_unpack_fn)(struct bkey *, const struct bkey_packed *);
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static inline void
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__bkey_unpack_key_format_checked(const struct btree *b,
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struct bkey *dst,
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const struct bkey_packed *src)
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{
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if (IS_ENABLED(HAVE_BCACHEFS_COMPILED_UNPACK)) {
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compiled_unpack_fn unpack_fn = b->aux_data;
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unpack_fn(dst, src);
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if (IS_ENABLED(CONFIG_BCACHEFS_DEBUG) &&
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bch2_expensive_debug_checks) {
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struct bkey dst2 = __bch2_bkey_unpack_key(&b->format, src);
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BUG_ON(memcmp(dst, &dst2, sizeof(*dst)));
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}
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} else {
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*dst = __bch2_bkey_unpack_key(&b->format, src);
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}
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}
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static inline struct bkey
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bkey_unpack_key_format_checked(const struct btree *b,
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const struct bkey_packed *src)
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{
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struct bkey dst;
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__bkey_unpack_key_format_checked(b, &dst, src);
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return dst;
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}
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static inline void __bkey_unpack_key(const struct btree *b,
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struct bkey *dst,
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const struct bkey_packed *src)
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{
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if (likely(bkey_packed(src)))
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__bkey_unpack_key_format_checked(b, dst, src);
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else
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*dst = *packed_to_bkey_c(src);
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}
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/**
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* bkey_unpack_key -- unpack just the key, not the value
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*/
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static inline struct bkey bkey_unpack_key(const struct btree *b,
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const struct bkey_packed *src)
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{
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return likely(bkey_packed(src))
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? bkey_unpack_key_format_checked(b, src)
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: *packed_to_bkey_c(src);
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}
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static inline struct bpos
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bkey_unpack_pos_format_checked(const struct btree *b,
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const struct bkey_packed *src)
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{
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#ifdef HAVE_BCACHEFS_COMPILED_UNPACK
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return bkey_unpack_key_format_checked(b, src).p;
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#else
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return __bkey_unpack_pos(&b->format, src);
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#endif
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}
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static inline struct bpos bkey_unpack_pos(const struct btree *b,
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const struct bkey_packed *src)
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{
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return likely(bkey_packed(src))
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? bkey_unpack_pos_format_checked(b, src)
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: packed_to_bkey_c(src)->p;
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}
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/* Disassembled bkeys */
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static inline struct bkey_s_c bkey_disassemble(const struct btree *b,
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const struct bkey_packed *k,
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struct bkey *u)
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{
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__bkey_unpack_key(b, u, k);
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return (struct bkey_s_c) { u, bkeyp_val(&b->format, k), };
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}
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/* non const version: */
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static inline struct bkey_s __bkey_disassemble(const struct btree *b,
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struct bkey_packed *k,
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struct bkey *u)
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{
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__bkey_unpack_key(b, u, k);
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return (struct bkey_s) { .k = u, .v = bkeyp_val(&b->format, k), };
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}
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static inline u64 bkey_field_max(const struct bkey_format *f,
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enum bch_bkey_fields nr)
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{
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return f->bits_per_field[nr] < 64
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? (le64_to_cpu(f->field_offset[nr]) +
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~(~0ULL << f->bits_per_field[nr]))
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: U64_MAX;
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}
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#ifdef HAVE_BCACHEFS_COMPILED_UNPACK
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int bch2_compile_bkey_format(const struct bkey_format *, void *);
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#else
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static inline int bch2_compile_bkey_format(const struct bkey_format *format,
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void *out) { return 0; }
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#endif
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static inline void bkey_reassemble(struct bkey_i *dst,
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struct bkey_s_c src)
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{
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dst->k = *src.k;
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memcpy_u64s_small(&dst->v, src.v, bkey_val_u64s(src.k));
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}
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/* byte order helpers */
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#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
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static inline unsigned high_word_offset(const struct bkey_format *f)
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{
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return f->key_u64s - 1;
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}
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#define high_bit_offset 0
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#define nth_word(p, n) ((p) - (n))
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#elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
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static inline unsigned high_word_offset(const struct bkey_format *f)
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{
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return 0;
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}
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#define high_bit_offset KEY_PACKED_BITS_START
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#define nth_word(p, n) ((p) + (n))
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#else
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#error edit for your odd byteorder.
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#endif
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#define high_word(f, k) ((u64 *) (k)->_data + high_word_offset(f))
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#define next_word(p) nth_word(p, 1)
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#define prev_word(p) nth_word(p, -1)
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#ifdef CONFIG_BCACHEFS_DEBUG
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void bch2_bkey_pack_test(void);
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#else
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static inline void bch2_bkey_pack_test(void) {}
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#endif
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#define bkey_fields() \
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x(BKEY_FIELD_INODE, p.inode) \
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x(BKEY_FIELD_OFFSET, p.offset) \
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x(BKEY_FIELD_SNAPSHOT, p.snapshot) \
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x(BKEY_FIELD_SIZE, size) \
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x(BKEY_FIELD_VERSION_HI, bversion.hi) \
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x(BKEY_FIELD_VERSION_LO, bversion.lo)
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struct bkey_format_state {
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u64 field_min[BKEY_NR_FIELDS];
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u64 field_max[BKEY_NR_FIELDS];
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};
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void bch2_bkey_format_init(struct bkey_format_state *);
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static inline void __bkey_format_add(struct bkey_format_state *s, unsigned field, u64 v)
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{
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s->field_min[field] = min(s->field_min[field], v);
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s->field_max[field] = max(s->field_max[field], v);
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}
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/*
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* Changes @format so that @k can be successfully packed with @format
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*/
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static inline void bch2_bkey_format_add_key(struct bkey_format_state *s, const struct bkey *k)
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{
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#define x(id, field) __bkey_format_add(s, id, k->field);
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bkey_fields()
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#undef x
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}
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void bch2_bkey_format_add_pos(struct bkey_format_state *, struct bpos);
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struct bkey_format bch2_bkey_format_done(struct bkey_format_state *);
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static inline bool bch2_bkey_format_field_overflows(struct bkey_format *f, unsigned i)
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{
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unsigned f_bits = f->bits_per_field[i];
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unsigned unpacked_bits = bch2_bkey_format_current.bits_per_field[i];
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u64 unpacked_mask = ~((~0ULL << 1) << (unpacked_bits - 1));
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u64 field_offset = le64_to_cpu(f->field_offset[i]);
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if (f_bits > unpacked_bits)
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return true;
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if ((f_bits == unpacked_bits) && field_offset)
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return true;
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u64 f_mask = f_bits
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? ~((~0ULL << (f_bits - 1)) << 1)
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: 0;
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if (((field_offset + f_mask) & unpacked_mask) < field_offset)
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return true;
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return false;
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}
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int bch2_bkey_format_invalid(struct bch_fs *, struct bkey_format *,
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enum bch_validate_flags, struct printbuf *);
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void bch2_bkey_format_to_text(struct printbuf *, const struct bkey_format *);
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#endif /* _BCACHEFS_BKEY_H */
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