fs/bcachefs/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_cache.h"
   6 #include "btree_iter.h"
   7 #include "btree_update.h"
   8 #include "buckets.h"
   9 #include "super.h"
  10
  11 static inline u64 swab40(u64 x)
  12 {
  13         return (((x & 0x00000000ffULL) << 32)|
  14                 ((x & 0x000000ff00ULL) << 16)|
  15                 ((x & 0x0000ff0000ULL) >>  0)|
  16                 ((x & 0x00ff000000ULL) >> 16)|
  17                 ((x & 0xff00000000ULL) >> 32));
  18 }
  19
  20 int bch2_backpointer_invalid(struct bch_fs *, struct bkey_s_c k,
  21                              enum bkey_invalid_flags, struct printbuf *);
  22 void bch2_backpointer_to_text(struct printbuf *, const struct bch_backpointer *);
  23 void bch2_backpointer_k_to_text(struct printbuf *, struct bch_fs *, struct bkey_s_c);
  24 void bch2_backpointer_swab(struct bkey_s);
  25
  26 #define bch2_bkey_ops_backpointer ((struct bkey_ops) {  \
  27         .key_invalid    = bch2_backpointer_invalid,     \
  28         .val_to_text    = bch2_backpointer_k_to_text,   \
  29         .swab           = bch2_backpointer_swab,        \
  30         .min_val_size   = 32,                           \
  31 })
  32
  33 #define MAX_EXTENT_COMPRESS_RATIO_SHIFT         10
  34
  35 /*
  36  * Convert from pos in backpointer btree to pos of corresponding bucket in alloc
  37  * btree:
  38  */
  39 static inline struct bpos bp_pos_to_bucket(const struct bch_fs *c,
  40                                            struct bpos bp_pos)
  41 {
  42         struct bch_dev *ca = bch_dev_bkey_exists(c, bp_pos.inode);
  43         u64 bucket_sector = bp_pos.offset >> MAX_EXTENT_COMPRESS_RATIO_SHIFT;
  44
  45         return POS(bp_pos.inode, sector_to_bucket(ca, bucket_sector));
  46 }
  47
  48 /*
  49  * Convert from pos in alloc btree + bucket offset to pos in backpointer btree:
  50  */
  51 static inline struct bpos bucket_pos_to_bp(const struct bch_fs *c,
  52                                            struct bpos bucket,
  53                                            u64 bucket_offset)
  54 {
  55         struct bch_dev *ca = bch_dev_bkey_exists(c, bucket.inode);
  56         struct bpos ret;
  57
  58         ret = POS(bucket.inode,
  59                   (bucket_to_sector(ca, bucket.offset) <<
  60                    MAX_EXTENT_COMPRESS_RATIO_SHIFT) + bucket_offset);
  61
  62         EBUG_ON(!bkey_eq(bucket, bp_pos_to_bucket(c, ret)));
  63
  64         return ret;
  65 }
  66
  67 int bch2_bucket_backpointer_mod_nowritebuffer(struct btree_trans *, struct bpos bucket,
  68                                 struct bch_backpointer, struct bkey_s_c, bool);
  69
  70 static inline int bch2_bucket_backpointer_mod(struct btree_trans *trans,
  71                                 struct bpos bucket,
  72                                 struct bch_backpointer bp,
  73                                 struct bkey_s_c orig_k,
  74                                 bool insert)
  75 {
  76         if (unlikely(bch2_backpointers_no_use_write_buffer))
  77                 return bch2_bucket_backpointer_mod_nowritebuffer(trans, bucket, bp, orig_k, insert);
  78
  79         struct bkey_i_backpointer bp_k;
  80
  81         bkey_backpointer_init(&bp_k.k_i);
  82         bp_k.k.p = bucket_pos_to_bp(trans->c, bucket, bp.bucket_offset);
  83         bp_k.v = bp;
  84
  85         if (!insert) {
  86                 bp_k.k.type = KEY_TYPE_deleted;
  87                 set_bkey_val_u64s(&bp_k.k, 0);
  88         }
  89
  90         return bch2_trans_update_buffered(trans, BTREE_ID_backpointers, &bp_k.k_i);
  91 }
  92
  93 static inline enum bch_data_type bch2_bkey_ptr_data_type(struct bkey_s_c k,
  94                                                          struct extent_ptr_decoded p,
  95                                                          const union bch_extent_entry *entry)
  96 {
  97         switch (k.k->type) {
  98         case KEY_TYPE_btree_ptr:
  99         case KEY_TYPE_btree_ptr_v2:
 100                 return BCH_DATA_btree;
 101         case KEY_TYPE_extent:
 102         case KEY_TYPE_reflink_v:
 103                 return p.has_ec ? BCH_DATA_stripe : BCH_DATA_user;
 104         case KEY_TYPE_stripe: {
 105                 const struct bch_extent_ptr *ptr = &entry->ptr;
 106                 struct bkey_s_c_stripe s = bkey_s_c_to_stripe(k);
 107
 108                 BUG_ON(ptr < s.v->ptrs ||
 109                        ptr >= s.v->ptrs + s.v->nr_blocks);
 110
 111                 return ptr >= s.v->ptrs + s.v->nr_blocks - s.v->nr_redundant
 112                         ? BCH_DATA_parity
 113                         : BCH_DATA_user;
 114         }
 115         default:
 116                 BUG();
 117         }
 118 }
 119
 120 static inline void bch2_extent_ptr_to_bp(struct bch_fs *c,
 121                            enum btree_id btree_id, unsigned level,
 122                            struct bkey_s_c k, struct extent_ptr_decoded p,
 123                            const union bch_extent_entry *entry,
 124                            struct bpos *bucket_pos, struct bch_backpointer *bp)
 125 {
 126         enum bch_data_type data_type = bch2_bkey_ptr_data_type(k, p, entry);
 127         s64 sectors = level ? btree_sectors(c) : k.k->size;
 128         u32 bucket_offset;
 129
 130         *bucket_pos = PTR_BUCKET_POS_OFFSET(c, &p.ptr, &bucket_offset);
 131         *bp = (struct bch_backpointer) {
 132                 .btree_id       = btree_id,
 133                 .level          = level,
 134                 .data_type      = data_type,
 135                 .bucket_offset  = ((u64) bucket_offset << MAX_EXTENT_COMPRESS_RATIO_SHIFT) +
 136                         p.crc.offset,
 137                 .bucket_len     = ptr_disk_sectors(sectors, p),
 138                 .pos            = k.k->p,
 139         };
 140 }
 141
 142 int bch2_get_next_backpointer(struct btree_trans *, struct bpos, int,
 143                               struct bpos *, struct bch_backpointer *, unsigned);
 144 struct bkey_s_c bch2_backpointer_get_key(struct btree_trans *, struct btree_iter *,
 145                                          struct bpos, struct bch_backpointer,
 146                                          unsigned);
 147 struct btree *bch2_backpointer_get_node(struct btree_trans *, struct btree_iter *,
 148                                         struct bpos, struct bch_backpointer);
 149
 150 int bch2_check_btree_backpointers(struct bch_fs *);
 151 int bch2_check_extents_to_backpointers(struct bch_fs *);
 152 int bch2_check_backpointers_to_extents(struct bch_fs *);
 153
 154 #endif /* _BCACHEFS_BACKPOINTERS_BACKGROUND_H */