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 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 bkey_i_backpointer *,
  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         struct bch_fs *c = trans->c;
  76         struct bkey_i_backpointer *bp_k;
  77         int ret;
  78
  79         bp_k = bch2_trans_kmalloc_nomemzero(trans, sizeof(struct bkey_i_backpointer));
  80         ret = PTR_ERR_OR_ZERO(bp_k);
  81         if (ret)
  82                 return ret;
  83
  84         bkey_backpointer_init(&bp_k->k_i);
  85         bp_k->k.p = bucket_pos_to_bp(c, bucket, bp.bucket_offset);
  86         bp_k->v = bp;
  87
  88         if (!insert) {
  89                 bp_k->k.type = KEY_TYPE_deleted;
  90                 set_bkey_val_u64s(&bp_k->k, 0);
  91         }
  92
  93         if (unlikely(bch2_backpointers_no_use_write_buffer))
  94                 return bch2_bucket_backpointer_mod_nowritebuffer(trans, bp_k, bp, orig_k, insert);
  95
  96         return bch2_trans_update_buffered(trans, BTREE_ID_backpointers, &bp_k->k_i);
  97 }
  98
  99 static inline enum bch_data_type bkey_ptr_data_type(enum btree_id btree_id, unsigned level,
 100                                                     struct bkey_s_c k, struct extent_ptr_decoded p)
 101 {
 102         return  level           ? BCH_DATA_btree :
 103                 p.has_ec        ? BCH_DATA_stripe :
 104                                   BCH_DATA_user;
 105 }
 106
 107 static inline void bch2_extent_ptr_to_bp(struct bch_fs *c,
 108                            enum btree_id btree_id, unsigned level,
 109                            struct bkey_s_c k, struct extent_ptr_decoded p,
 110                            struct bpos *bucket_pos, struct bch_backpointer *bp)
 111 {
 112         enum bch_data_type data_type = bkey_ptr_data_type(btree_id, level, k, p);
 113         s64 sectors = level ? btree_sectors(c) : k.k->size;
 114         u32 bucket_offset;
 115
 116         *bucket_pos = PTR_BUCKET_POS_OFFSET(c, &p.ptr, &bucket_offset);
 117         *bp = (struct bch_backpointer) {
 118                 .btree_id       = btree_id,
 119                 .level          = level,
 120                 .data_type      = data_type,
 121                 .bucket_offset  = ((u64) bucket_offset << MAX_EXTENT_COMPRESS_RATIO_SHIFT) +
 122                         p.crc.offset,
 123                 .bucket_len     = ptr_disk_sectors(sectors, p),
 124                 .pos            = k.k->p,
 125         };
 126 }
 127
 128 int bch2_get_next_backpointer(struct btree_trans *, struct bpos, int,
 129                               struct bpos *, struct bch_backpointer *, unsigned);
 130 struct bkey_s_c bch2_backpointer_get_key(struct btree_trans *, struct btree_iter *,
 131                                          struct bpos, struct bch_backpointer,
 132                                          unsigned);
 133 struct btree *bch2_backpointer_get_node(struct btree_trans *, struct btree_iter *,
 134                                         struct bpos, struct bch_backpointer);
 135
 136 int bch2_check_btree_backpointers(struct bch_fs *);
 137 int bch2_check_extents_to_backpointers(struct bch_fs *);
 138 int bch2_check_backpointers_to_extents(struct bch_fs *);
 139
 140 #endif /* _BCACHEFS_BACKPOINTERS_BACKGROUND_H */