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         .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 bpos,
  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         if (unlikely(bch2_backpointers_no_use_write_buffer))
  71                 return bch2_bucket_backpointer_mod_nowritebuffer(trans, bucket, bp, orig_k, insert);
  72
  73         bp_k = bch2_trans_kmalloc_nomemzero(trans, sizeof(struct bkey_i_backpointer));
  74         ret = PTR_ERR_OR_ZERO(bp_k);
  75         if (ret)
  76                 return ret;
  77
  78         bkey_backpointer_init(&bp_k->k_i);
  79         bp_k->k.p = bucket_pos_to_bp(c, bucket, bp.bucket_offset);
  80         bp_k->v = bp;
  81
  82         if (!insert) {
  83                 bp_k->k.type = KEY_TYPE_deleted;
  84                 set_bkey_val_u64s(&bp_k->k, 0);
  85         }
  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 */