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 int bch2_backpointer_invalid(const struct bch_fs *, struct bkey_s_c k, 11 enum bkey_invalid_flags, struct printbuf *); 12 void bch2_backpointer_to_text(struct printbuf *, const struct bch_backpointer *); 13 void bch2_backpointer_k_to_text(struct printbuf *, struct bch_fs *, struct bkey_s_c); 14 void bch2_backpointer_swab(struct bkey_s); 15 16 #define bch2_bkey_ops_backpointer ((struct bkey_ops) { \ 17 .key_invalid = bch2_backpointer_invalid, \ 18 .val_to_text = bch2_backpointer_k_to_text, \ 19 .swab = bch2_backpointer_swab, \ 20 .min_val_size = 32, \ 21 }) 22 23 #define MAX_EXTENT_COMPRESS_RATIO_SHIFT 10 24 25 /* 26 * Convert from pos in backpointer btree to pos of corresponding bucket in alloc 27 * btree: 28 */ 29 static inline struct bpos bp_pos_to_bucket(const struct bch_fs *c, 30 struct bpos bp_pos) 31 { 32 struct bch_dev *ca = bch_dev_bkey_exists(c, bp_pos.inode); 33 u64 bucket_sector = bp_pos.offset >> MAX_EXTENT_COMPRESS_RATIO_SHIFT; 34 35 return POS(bp_pos.inode, sector_to_bucket(ca, bucket_sector)); 36 } 37 38 /* 39 * Convert from pos in alloc btree + bucket offset to pos in backpointer btree: 40 */ 41 static inline struct bpos bucket_pos_to_bp(const struct bch_fs *c, 42 struct bpos bucket, 43 u64 bucket_offset) 44 { 45 struct bch_dev *ca = bch_dev_bkey_exists(c, bucket.inode); 46 struct bpos ret; 47 48 ret = POS(bucket.inode, 49 (bucket_to_sector(ca, bucket.offset) << 50 MAX_EXTENT_COMPRESS_RATIO_SHIFT) + bucket_offset); 51 52 EBUG_ON(!bkey_eq(bucket, bp_pos_to_bucket(c, ret))); 53 54 return ret; 55 } 56 57 int bch2_bucket_backpointer_mod_nowritebuffer(struct btree_trans *, struct bkey_i_backpointer *, 58 struct bch_backpointer, struct bkey_s_c, bool); 59 60 static inline int bch2_bucket_backpointer_mod(struct btree_trans *trans, 61 struct bpos bucket, 62 struct bch_backpointer bp, 63 struct bkey_s_c orig_k, 64 bool insert) 65 { 66 struct bch_fs *c = trans->c; 67 struct bkey_i_backpointer *bp_k; 68 int ret; 69 70 bp_k = bch2_trans_kmalloc_nomemzero(trans, sizeof(struct bkey_i_backpointer)); 71 ret = PTR_ERR_OR_ZERO(bp_k); 72 if (ret) 73 return ret; 74 75 bkey_backpointer_init(&bp_k->k_i); 76 bp_k->k.p = bucket_pos_to_bp(c, bucket, bp.bucket_offset); 77 bp_k->v = bp; 78 79 if (!insert) { 80 bp_k->k.type = KEY_TYPE_deleted; 81 set_bkey_val_u64s(&bp_k->k, 0); 82 } 83 84 if (unlikely(bch2_backpointers_no_use_write_buffer)) 85 return bch2_bucket_backpointer_mod_nowritebuffer(trans, bp_k, bp, orig_k, insert); 86 87 return bch2_trans_update_buffered(trans, BTREE_ID_backpointers, &bp_k->k_i); 88 } 89 90 static inline enum bch_data_type bkey_ptr_data_type(enum btree_id btree_id, unsigned level, 91 struct bkey_s_c k, struct extent_ptr_decoded p) 92 { 93 return level ? BCH_DATA_btree : 94 p.has_ec ? BCH_DATA_stripe : 95 BCH_DATA_user; 96 } 97 98 static inline void bch2_extent_ptr_to_bp(struct bch_fs *c, 99 enum btree_id btree_id, unsigned level, 100 struct bkey_s_c k, struct extent_ptr_decoded p, 101 struct bpos *bucket_pos, struct bch_backpointer *bp) 102 { 103 enum bch_data_type data_type = bkey_ptr_data_type(btree_id, level, k, p); 104 s64 sectors = level ? btree_sectors(c) : k.k->size; 105 u32 bucket_offset; 106 107 *bucket_pos = PTR_BUCKET_POS_OFFSET(c, &p.ptr, &bucket_offset); 108 *bp = (struct bch_backpointer) { 109 .btree_id = btree_id, 110 .level = level, 111 .data_type = data_type, 112 .bucket_offset = ((u64) bucket_offset << MAX_EXTENT_COMPRESS_RATIO_SHIFT) + 113 p.crc.offset, 114 .bucket_len = ptr_disk_sectors(sectors, p), 115 .pos = k.k->p, 116 }; 117 } 118 119 int bch2_get_next_backpointer(struct btree_trans *, struct bpos, int, 120 struct bpos *, struct bch_backpointer *, unsigned); 121 struct bkey_s_c bch2_backpointer_get_key(struct btree_trans *, struct btree_iter *, 122 struct bpos, struct bch_backpointer, 123 unsigned); 124 struct btree *bch2_backpointer_get_node(struct btree_trans *, struct btree_iter *, 125 struct bpos, struct bch_backpointer); 126 127 int bch2_check_btree_backpointers(struct bch_fs *); 128 int bch2_check_extents_to_backpointers(struct bch_fs *); 129 int bch2_check_backpointers_to_extents(struct bch_fs *); 130 131 #endif /* _BCACHEFS_BACKPOINTERS_BACKGROUND_H */ 132