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 "error.h"
  10 #include "super.h"
  11
  12 static inline u64 swab40(u64 x)
  13 {
  14         return (((x & 0x00000000ffULL) << 32)|
  15                 ((x & 0x000000ff00ULL) << 16)|
  16                 ((x & 0x0000ff0000ULL) >>  0)|
  17                 ((x & 0x00ff000000ULL) >> 16)|
  18                 ((x & 0xff00000000ULL) >> 32));
  19 }
  20
  21 int bch2_backpointer_validate(struct bch_fs *, struct bkey_s_c k, enum bch_validate_flags);
  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_validate   = bch2_backpointer_validate,    \
  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_dev *ca, struct bpos bp_pos)
  40 {
  41         u64 bucket_sector = bp_pos.offset >> MAX_EXTENT_COMPRESS_RATIO_SHIFT;
  42
  43         return POS(bp_pos.inode, sector_to_bucket(ca, bucket_sector));
  44 }
  45
  46 static inline bool bp_pos_to_bucket_nodev_noerror(struct bch_fs *c, struct bpos bp_pos, struct bpos *bucket)
  47 {
  48         rcu_read_lock();
  49         struct bch_dev *ca = bch2_dev_rcu(c, bp_pos.inode);
  50         if (ca)
  51                 *bucket = bp_pos_to_bucket(ca, bp_pos);
  52         rcu_read_unlock();
  53         return ca != NULL;
  54 }
  55
  56 static inline bool bp_pos_to_bucket_nodev(struct bch_fs *c, struct bpos bp_pos, struct bpos *bucket)
  57 {
  58         return !bch2_fs_inconsistent_on(!bp_pos_to_bucket_nodev_noerror(c, bp_pos, bucket),
  59                                         c, "backpointer for missing device %llu", bp_pos.inode);
  60 }
  61
  62 static inline struct bpos bucket_pos_to_bp_noerror(const struct bch_dev *ca,
  63                                                    struct bpos bucket,
  64                                                    u64 bucket_offset)
  65 {
  66         return POS(bucket.inode,
  67                    (bucket_to_sector(ca, bucket.offset) <<
  68                     MAX_EXTENT_COMPRESS_RATIO_SHIFT) + bucket_offset);
  69 }
  70
  71 /*
  72  * Convert from pos in alloc btree + bucket offset to pos in backpointer btree:
  73  */
  74 static inline struct bpos bucket_pos_to_bp(const struct bch_dev *ca,
  75                                            struct bpos bucket,
  76                                            u64 bucket_offset)
  77 {
  78         struct bpos ret = bucket_pos_to_bp_noerror(ca, bucket, bucket_offset);
  79         EBUG_ON(!bkey_eq(bucket, bp_pos_to_bucket(ca, ret)));
  80         return ret;
  81 }
  82
  83 int bch2_bucket_backpointer_mod_nowritebuffer(struct btree_trans *, struct bch_dev *,
  84                                 struct bpos bucket, struct bch_backpointer, struct bkey_s_c, bool);
  85
  86 static inline int bch2_bucket_backpointer_mod(struct btree_trans *trans,
  87                                 struct bch_dev *ca,
  88                                 struct bpos bucket,
  89                                 struct bch_backpointer bp,
  90                                 struct bkey_s_c orig_k,
  91                                 bool insert)
  92 {
  93         if (unlikely(bch2_backpointers_no_use_write_buffer))
  94                 return bch2_bucket_backpointer_mod_nowritebuffer(trans, ca, bucket, bp, orig_k, insert);
  95
  96         struct bkey_i_backpointer bp_k;
  97
  98         bkey_backpointer_init(&bp_k.k_i);
  99         bp_k.k.p = bucket_pos_to_bp(ca, bucket, bp.bucket_offset);
 100         bp_k.v = bp;
 101
 102         if (!insert) {
 103                 bp_k.k.type = KEY_TYPE_deleted;
 104                 set_bkey_val_u64s(&bp_k.k, 0);
 105         }
 106
 107         return bch2_trans_update_buffered(trans, BTREE_ID_backpointers, &bp_k.k_i);
 108 }
 109
 110 static inline enum bch_data_type bch2_bkey_ptr_data_type(struct bkey_s_c k,
 111                                                          struct extent_ptr_decoded p,
 112                                                          const union bch_extent_entry *entry)
 113 {
 114         switch (k.k->type) {
 115         case KEY_TYPE_btree_ptr:
 116         case KEY_TYPE_btree_ptr_v2:
 117                 return BCH_DATA_btree;
 118         case KEY_TYPE_extent:
 119         case KEY_TYPE_reflink_v:
 120                 return p.has_ec ? BCH_DATA_stripe : BCH_DATA_user;
 121         case KEY_TYPE_stripe: {
 122                 const struct bch_extent_ptr *ptr = &entry->ptr;
 123                 struct bkey_s_c_stripe s = bkey_s_c_to_stripe(k);
 124
 125                 BUG_ON(ptr < s.v->ptrs ||
 126                        ptr >= s.v->ptrs + s.v->nr_blocks);
 127
 128                 return ptr >= s.v->ptrs + s.v->nr_blocks - s.v->nr_redundant
 129                         ? BCH_DATA_parity
 130                         : BCH_DATA_user;
 131         }
 132         default:
 133                 BUG();
 134         }
 135 }
 136
 137 static inline void __bch2_extent_ptr_to_bp(struct bch_fs *c, struct bch_dev *ca,
 138                            enum btree_id btree_id, unsigned level,
 139                            struct bkey_s_c k, struct extent_ptr_decoded p,
 140                            const union bch_extent_entry *entry,
 141                            struct bpos *bucket_pos, struct bch_backpointer *bp,
 142                            u64 sectors)
 143 {
 144         u32 bucket_offset;
 145         *bucket_pos = PTR_BUCKET_POS_OFFSET(ca, &p.ptr, &bucket_offset);
 146         *bp = (struct bch_backpointer) {
 147                 .btree_id       = btree_id,
 148                 .level          = level,
 149                 .data_type      = bch2_bkey_ptr_data_type(k, p, entry),
 150                 .bucket_offset  = ((u64) bucket_offset << MAX_EXTENT_COMPRESS_RATIO_SHIFT) +
 151                         p.crc.offset,
 152                 .bucket_len     = sectors,
 153                 .pos            = k.k->p,
 154         };
 155 }
 156
 157 static inline void bch2_extent_ptr_to_bp(struct bch_fs *c, struct bch_dev *ca,
 158                            enum btree_id btree_id, unsigned level,
 159                            struct bkey_s_c k, struct extent_ptr_decoded p,
 160                            const union bch_extent_entry *entry,
 161                            struct bpos *bucket_pos, struct bch_backpointer *bp)
 162 {
 163         u64 sectors = ptr_disk_sectors(level ? btree_sectors(c) : k.k->size, p);
 164
 165         __bch2_extent_ptr_to_bp(c, ca, btree_id, level, k, p, entry, bucket_pos, bp, sectors);
 166 }
 167
 168 int bch2_get_next_backpointer(struct btree_trans *, struct bch_dev *ca, struct bpos, int,
 169                               struct bpos *, struct bch_backpointer *, unsigned);
 170 struct bkey_s_c bch2_backpointer_get_key(struct btree_trans *, struct btree_iter *,
 171                                          struct bpos, struct bch_backpointer,
 172                                          unsigned);
 173 struct btree *bch2_backpointer_get_node(struct btree_trans *, struct btree_iter *,
 174                                         struct bpos, struct bch_backpointer);
 175
 176 int bch2_check_btree_backpointers(struct bch_fs *);
 177 int bch2_check_extents_to_backpointers(struct bch_fs *);
 178 int bch2_check_backpointers_to_extents(struct bch_fs *);
 179
 180 #endif /* _BCACHEFS_BACKPOINTERS_BACKGROUND_H */