git.sesse.net Git - bcachefs-tools-debian/blob - libbcachefs/backpointers.h

   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                              unsigned, 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 })
  21
  22 #define MAX_EXTENT_COMPRESS_RATIO_SHIFT         10
  23
  24 /*
  25  * Convert from pos in backpointer btree to pos of corresponding bucket in alloc
  26  * btree:
  27  */
  28 static inline struct bpos bp_pos_to_bucket(const struct bch_fs *c,
  29                                            struct bpos bp_pos)
  30 {
  31         struct bch_dev *ca = bch_dev_bkey_exists(c, bp_pos.inode);
  32         u64 bucket_sector = bp_pos.offset >> MAX_EXTENT_COMPRESS_RATIO_SHIFT;
  33
  34         return POS(bp_pos.inode, sector_to_bucket(ca, bucket_sector));
  35 }
  36
  37 /*
  38  * Convert from pos in alloc btree + bucket offset to pos in backpointer btree:
  39  */
  40 static inline struct bpos bucket_pos_to_bp(const struct bch_fs *c,
  41                                            struct bpos bucket,
  42                                            u64 bucket_offset)
  43 {
  44         struct bch_dev *ca = bch_dev_bkey_exists(c, bucket.inode);
  45         struct bpos ret;
  46
  47         ret = POS(bucket.inode,
  48                   (bucket_to_sector(ca, bucket.offset) <<
  49                    MAX_EXTENT_COMPRESS_RATIO_SHIFT) + bucket_offset);
  50
  51         BUG_ON(!bkey_eq(bucket, bp_pos_to_bucket(c, ret)));
  52
  53         return ret;
  54 }
  55
  56 bool bch2_bucket_backpointer_del(struct btree_trans *,
  57                                 struct bkey_i_alloc_v4 *,
  58                                 struct bch_backpointer);
  59
  60 int bch2_bucket_backpointer_mod_nowritebuffer(struct btree_trans *,
  61                                 struct bkey_i_alloc_v4 *,
  62                                 struct bch_backpointer, struct bkey_s_c, bool);
  63
  64 static inline int bch2_bucket_backpointer_mod(struct btree_trans *trans,
  65                                 struct bkey_i_alloc_v4 *a,
  66                                 struct bch_backpointer bp,
  67                                 struct bkey_s_c orig_k,
  68                                 bool insert)
  69 {
  70         struct bch_fs *c = trans->c;
  71         struct bkey_i_backpointer *bp_k;
  72         int ret;
  73
  74         if (!insert &&
  75             unlikely(BCH_ALLOC_V4_NR_BACKPOINTERS(&a->v)) &&
  76             bch2_bucket_backpointer_del(trans, a, bp))
  77                 return 0;
  78
  79         if (unlikely(bch2_backpointers_no_use_write_buffer))
  80                 return bch2_bucket_backpointer_mod_nowritebuffer(trans, a, bp, orig_k, insert);
  81
  82         bp_k = bch2_trans_kmalloc_nomemzero(trans, sizeof(struct bkey_i_backpointer));
  83         ret = PTR_ERR_OR_ZERO(bp_k);
  84         if (ret)
  85                 return ret;
  86
  87         bkey_backpointer_init(&bp_k->k_i);
  88         bp_k->k.p = bucket_pos_to_bp(c, a->k.p, bp.bucket_offset);
  89         bp_k->v = bp;
  90
  91         if (!insert) {
  92                 bp_k->k.type = KEY_TYPE_deleted;
  93                 set_bkey_val_u64s(&bp_k->k, 0);
  94         }
  95
  96         return bch2_trans_update_buffered(trans, BTREE_ID_backpointers, &bp_k->k_i);
  97 }
  98
  99 static inline void bch2_extent_ptr_to_bp(struct bch_fs *c,
 100                            enum btree_id btree_id, unsigned level,
 101                            struct bkey_s_c k, struct extent_ptr_decoded p,
 102                            struct bpos *bucket_pos, struct bch_backpointer *bp)
 103 {
 104         enum bch_data_type data_type = level ? BCH_DATA_btree : BCH_DATA_user;
 105         s64 sectors = level ? btree_sectors(c) : k.k->size;
 106         u32 bucket_offset;
 107
 108         *bucket_pos = PTR_BUCKET_POS_OFFSET(c, &p.ptr, &bucket_offset);
 109         *bp = (struct bch_backpointer) {
 110                 .btree_id       = btree_id,
 111                 .level          = level,
 112                 .data_type      = data_type,
 113                 .bucket_offset  = ((u64) bucket_offset << MAX_EXTENT_COMPRESS_RATIO_SHIFT) +
 114                         p.crc.offset,
 115                 .bucket_len     = ptr_disk_sectors(sectors, p),
 116                 .pos            = k.k->p,
 117         };
 118 }
 119
 120 int bch2_get_next_backpointer(struct btree_trans *, struct bpos, int,
 121                               u64 *, struct bch_backpointer *, unsigned);
 122 struct bkey_s_c bch2_backpointer_get_key(struct btree_trans *, struct btree_iter *,
 123                                          struct bpos, u64, struct bch_backpointer);
 124 struct btree *bch2_backpointer_get_node(struct btree_trans *, struct btree_iter *,
 125                                         struct bpos, u64, 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 */