1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _BCACHEFS_BACKPOINTERS_BACKGROUND_H 3 #define _BCACHEFS_BACKPOINTERS_BACKGROUND_H 4 5 #include "btree_iter.h" 6 #include "btree_update.h" 7 #include "buckets.h" 8 #include "super.h" 9 10 static inline u64 swab40(u64 x) 11 { 12 return (((x & 0x00000000ffULL) << 32)| 13 ((x & 0x000000ff00ULL) << 16)| 14 ((x & 0x0000ff0000ULL) >> 0)| 15 ((x & 0x00ff000000ULL) >> 16)| 16 ((x & 0xff00000000ULL) >> 32)); 17 } 18 19 int bch2_backpointer_invalid(struct bch_fs *, struct bkey_s_c k, 20 enum bkey_invalid_flags, struct printbuf *); 21 void bch2_backpointer_to_text(struct printbuf *, const struct bch_backpointer *); 22 void bch2_backpointer_k_to_text(struct printbuf *, struct bch_fs *, struct bkey_s_c); 23 void bch2_backpointer_swab(struct bkey_s); 24 25 #define bch2_bkey_ops_backpointer ((struct bkey_ops) { \ 26 .key_invalid = bch2_backpointer_invalid, \ 27 .val_to_text = bch2_backpointer_k_to_text, \ 28 .swab = bch2_backpointer_swab, \ 29 .min_val_size = 32, \ 30 }) 31 32 #define MAX_EXTENT_COMPRESS_RATIO_SHIFT 10 33 34 /* 35 * Convert from pos in backpointer btree to pos of corresponding bucket in alloc 36 * btree: 37 */ 38 static inline struct bpos bp_pos_to_bucket(const struct bch_fs *c, 39 struct bpos bp_pos) 40 { 41 struct bch_dev *ca = bch_dev_bkey_exists(c, bp_pos.inode); 42 u64 bucket_sector = bp_pos.offset >> MAX_EXTENT_COMPRESS_RATIO_SHIFT; 43 44 return POS(bp_pos.inode, sector_to_bucket(ca, bucket_sector)); 45 } 46 47 /* 48 * Convert from pos in alloc btree + bucket offset to pos in backpointer btree: 49 */ 50 static inline struct bpos bucket_pos_to_bp(const struct bch_fs *c, 51 struct bpos bucket, 52 u64 bucket_offset) 53 { 54 struct bch_dev *ca = bch_dev_bkey_exists(c, bucket.inode); 55 struct bpos ret; 56 57 ret = POS(bucket.inode, 58 (bucket_to_sector(ca, bucket.offset) << 59 MAX_EXTENT_COMPRESS_RATIO_SHIFT) + bucket_offset); 60 61 EBUG_ON(!bkey_eq(bucket, bp_pos_to_bucket(c, ret))); 62 63 return ret; 64 } 65 66 int bch2_bucket_backpointer_mod_nowritebuffer(struct btree_trans *, struct bpos bucket, 67 struct bch_backpointer, struct bkey_s_c, bool); 68 69 static inline int bch2_bucket_backpointer_mod(struct btree_trans *trans, 70 struct bpos bucket, 71 struct bch_backpointer bp, 72 struct bkey_s_c orig_k, 73 bool insert) 74 { 75 if (unlikely(bch2_backpointers_no_use_write_buffer)) 76 return bch2_bucket_backpointer_mod_nowritebuffer(trans, bucket, bp, orig_k, insert); 77 78 struct bkey_i_backpointer bp_k; 79 80 bkey_backpointer_init(&bp_k.k_i); 81 bp_k.k.p = bucket_pos_to_bp(trans->c, bucket, bp.bucket_offset); 82 bp_k.v = bp; 83 84 if (!insert) { 85 bp_k.k.type = KEY_TYPE_deleted; 86 set_bkey_val_u64s(&bp_k.k, 0); 87 } 88 89 return bch2_trans_update_buffered(trans, BTREE_ID_backpointers, &bp_k.k_i); 90 } 91 92 static inline enum bch_data_type bkey_ptr_data_type(enum btree_id btree_id, unsigned level, 93 struct bkey_s_c k, struct extent_ptr_decoded p) 94 { 95 return level ? BCH_DATA_btree : 96 p.has_ec ? BCH_DATA_stripe : 97 BCH_DATA_user; 98 } 99 100 static inline void bch2_extent_ptr_to_bp(struct bch_fs *c, 101 enum btree_id btree_id, unsigned level, 102 struct bkey_s_c k, struct extent_ptr_decoded p, 103 struct bpos *bucket_pos, struct bch_backpointer *bp) 104 { 105 enum bch_data_type data_type = bkey_ptr_data_type(btree_id, level, k, p); 106 s64 sectors = level ? btree_sectors(c) : k.k->size; 107 u32 bucket_offset; 108 109 *bucket_pos = PTR_BUCKET_POS_OFFSET(c, &p.ptr, &bucket_offset); 110 *bp = (struct bch_backpointer) { 111 .btree_id = btree_id, 112 .level = level, 113 .data_type = data_type, 114 .bucket_offset = ((u64) bucket_offset << MAX_EXTENT_COMPRESS_RATIO_SHIFT) + 115 p.crc.offset, 116 .bucket_len = ptr_disk_sectors(sectors, p), 117 .pos = k.k->p, 118 }; 119 } 120 121 int bch2_get_next_backpointer(struct btree_trans *, struct bpos, int, 122 struct bpos *, struct bch_backpointer *, unsigned); 123 struct bkey_s_c bch2_backpointer_get_key(struct btree_trans *, struct btree_iter *, 124 struct bpos, struct bch_backpointer, 125 unsigned); 126 struct btree *bch2_backpointer_get_node(struct btree_trans *, struct btree_iter *, 127 struct bpos, struct bch_backpointer); 128 129 int bch2_check_btree_backpointers(struct bch_fs *); 130 int bch2_check_extents_to_backpointers(struct bch_fs *); 131 int bch2_check_backpointers_to_extents(struct bch_fs *); 132 133 #endif /* _BCACHEFS_BACKPOINTERS_BACKGROUND_H */ 134