1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _BCACHEFS_BACKPOINTERS_BACKGROUND_H
3 #define _BCACHEFS_BACKPOINTERS_BACKGROUND_H
5 #include "btree_cache.h"
6 #include "btree_iter.h"
7 #include "btree_update.h"
11 static inline u64 swab40(u64 x)
13 return (((x & 0x00000000ffULL) << 32)|
14 ((x & 0x000000ff00ULL) << 16)|
15 ((x & 0x0000ff0000ULL) >> 0)|
16 ((x & 0x00ff000000ULL) >> 16)|
17 ((x & 0xff00000000ULL) >> 32));
20 int bch2_backpointer_invalid(struct bch_fs *, struct bkey_s_c k,
21 enum bkey_invalid_flags, struct printbuf *);
22 void bch2_backpointer_to_text(struct printbuf *, const struct bch_backpointer *);
23 void bch2_backpointer_k_to_text(struct printbuf *, struct bch_fs *, struct bkey_s_c);
24 void bch2_backpointer_swab(struct bkey_s);
26 #define bch2_bkey_ops_backpointer ((struct bkey_ops) { \
27 .key_invalid = bch2_backpointer_invalid, \
28 .val_to_text = bch2_backpointer_k_to_text, \
29 .swab = bch2_backpointer_swab, \
33 #define MAX_EXTENT_COMPRESS_RATIO_SHIFT 10
36 * Convert from pos in backpointer btree to pos of corresponding bucket in alloc
39 static inline struct bpos bp_pos_to_bucket(const struct bch_fs *c,
42 struct bch_dev *ca = bch_dev_bkey_exists(c, bp_pos.inode);
43 u64 bucket_sector = bp_pos.offset >> MAX_EXTENT_COMPRESS_RATIO_SHIFT;
45 return POS(bp_pos.inode, sector_to_bucket(ca, bucket_sector));
49 * Convert from pos in alloc btree + bucket offset to pos in backpointer btree:
51 static inline struct bpos bucket_pos_to_bp(const struct bch_fs *c,
55 struct bch_dev *ca = bch_dev_bkey_exists(c, bucket.inode);
58 ret = POS(bucket.inode,
59 (bucket_to_sector(ca, bucket.offset) <<
60 MAX_EXTENT_COMPRESS_RATIO_SHIFT) + bucket_offset);
62 EBUG_ON(!bkey_eq(bucket, bp_pos_to_bucket(c, ret)));
67 int bch2_bucket_backpointer_mod_nowritebuffer(struct btree_trans *, struct bpos bucket,
68 struct bch_backpointer, struct bkey_s_c, bool);
70 static inline int bch2_bucket_backpointer_mod(struct btree_trans *trans,
72 struct bch_backpointer bp,
73 struct bkey_s_c orig_k,
76 if (unlikely(bch2_backpointers_no_use_write_buffer))
77 return bch2_bucket_backpointer_mod_nowritebuffer(trans, bucket, bp, orig_k, insert);
79 struct bkey_i_backpointer bp_k;
81 bkey_backpointer_init(&bp_k.k_i);
82 bp_k.k.p = bucket_pos_to_bp(trans->c, bucket, bp.bucket_offset);
86 bp_k.k.type = KEY_TYPE_deleted;
87 set_bkey_val_u64s(&bp_k.k, 0);
90 return bch2_trans_update_buffered(trans, BTREE_ID_backpointers, &bp_k.k_i);
93 static inline enum bch_data_type bch2_bkey_ptr_data_type(struct bkey_s_c k,
94 struct extent_ptr_decoded p,
95 const union bch_extent_entry *entry)
98 case KEY_TYPE_btree_ptr:
99 case KEY_TYPE_btree_ptr_v2:
100 return BCH_DATA_btree;
101 case KEY_TYPE_extent:
102 case KEY_TYPE_reflink_v:
103 return p.has_ec ? BCH_DATA_stripe : BCH_DATA_user;
104 case KEY_TYPE_stripe: {
105 const struct bch_extent_ptr *ptr = &entry->ptr;
106 struct bkey_s_c_stripe s = bkey_s_c_to_stripe(k);
108 BUG_ON(ptr < s.v->ptrs ||
109 ptr >= s.v->ptrs + s.v->nr_blocks);
111 return ptr >= s.v->ptrs + s.v->nr_blocks - s.v->nr_redundant
120 static inline void bch2_extent_ptr_to_bp(struct bch_fs *c,
121 enum btree_id btree_id, unsigned level,
122 struct bkey_s_c k, struct extent_ptr_decoded p,
123 const union bch_extent_entry *entry,
124 struct bpos *bucket_pos, struct bch_backpointer *bp)
126 enum bch_data_type data_type = bch2_bkey_ptr_data_type(k, p, entry);
127 s64 sectors = level ? btree_sectors(c) : k.k->size;
130 *bucket_pos = PTR_BUCKET_POS_OFFSET(c, &p.ptr, &bucket_offset);
131 *bp = (struct bch_backpointer) {
132 .btree_id = btree_id,
134 .data_type = data_type,
135 .bucket_offset = ((u64) bucket_offset << MAX_EXTENT_COMPRESS_RATIO_SHIFT) +
137 .bucket_len = ptr_disk_sectors(sectors, p),
142 int bch2_get_next_backpointer(struct btree_trans *, struct bpos, int,
143 struct bpos *, struct bch_backpointer *, unsigned);
144 struct bkey_s_c bch2_backpointer_get_key(struct btree_trans *, struct btree_iter *,
145 struct bpos, struct bch_backpointer,
147 struct btree *bch2_backpointer_get_node(struct btree_trans *, struct btree_iter *,
148 struct bpos, struct bch_backpointer);
150 int bch2_check_btree_backpointers(struct bch_fs *);
151 int bch2_check_extents_to_backpointers(struct bch_fs *);
152 int bch2_check_backpointers_to_extents(struct bch_fs *);
154 #endif /* _BCACHEFS_BACKPOINTERS_BACKGROUND_H */