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cff07e2739
LRUs only have 48 bits for the time field (i.e. LRU order); thus we need overflow checks and guards. Reported-by: syzbot+df3bf3f088dcaa728857@syzkaller.appspotmail.com Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
67 lines
1.6 KiB
C
67 lines
1.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _BCACHEFS_LRU_H
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#define _BCACHEFS_LRU_H
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static inline u64 lru_pos_id(struct bpos pos)
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{
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return pos.inode >> LRU_TIME_BITS;
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}
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static inline u64 lru_pos_time(struct bpos pos)
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{
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return pos.inode & ~(~0ULL << LRU_TIME_BITS);
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}
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static inline struct bpos lru_pos(u16 lru_id, u64 dev_bucket, u64 time)
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{
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struct bpos pos = POS(((u64) lru_id << LRU_TIME_BITS)|time, dev_bucket);
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EBUG_ON(time > LRU_TIME_MAX);
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EBUG_ON(lru_pos_id(pos) != lru_id);
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EBUG_ON(lru_pos_time(pos) != time);
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EBUG_ON(pos.offset != dev_bucket);
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return pos;
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}
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#define BCH_LRU_TYPES() \
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x(read) \
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x(fragmentation)
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enum bch_lru_type {
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#define x(n) BCH_LRU_##n,
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BCH_LRU_TYPES()
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#undef x
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};
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#define BCH_LRU_FRAGMENTATION_START ((1U << 16) - 1)
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static inline enum bch_lru_type lru_type(struct bkey_s_c l)
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{
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u16 lru_id = l.k->p.inode >> 48;
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if (lru_id == BCH_LRU_FRAGMENTATION_START)
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return BCH_LRU_fragmentation;
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return BCH_LRU_read;
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}
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int bch2_lru_invalid(struct bch_fs *, struct bkey_s_c,
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enum bch_validate_flags, struct printbuf *);
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void bch2_lru_to_text(struct printbuf *, struct bch_fs *, struct bkey_s_c);
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void bch2_lru_pos_to_text(struct printbuf *, struct bpos);
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#define bch2_bkey_ops_lru ((struct bkey_ops) { \
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.key_invalid = bch2_lru_invalid, \
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.val_to_text = bch2_lru_to_text, \
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.min_val_size = 8, \
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})
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int bch2_lru_del(struct btree_trans *, u16, u64, u64);
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int bch2_lru_set(struct btree_trans *, u16, u64, u64);
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int bch2_lru_change(struct btree_trans *, u16, u64, u64, u64);
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int bch2_check_lrus(struct bch_fs *);
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#endif /* _BCACHEFS_LRU_H */
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