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

   1 #ifndef _BCACHEFS_BTREE_IO_H
   2 #define _BCACHEFS_BTREE_IO_H
   3
   4 #include "bset.h"
   5 #include "btree_locking.h"
   6 #include "extents.h"
   7 #include "io_types.h"
   8
   9 struct bch_fs;
  10 struct btree_write;
  11 struct btree;
  12 struct btree_iter;
  13
  14 struct btree_read_bio {
  15         struct bch_fs           *c;
  16         u64                     start_time;
  17         unsigned                have_ioref:1;
  18         struct extent_ptr_decoded       pick;
  19         struct work_struct      work;
  20         struct bio              bio;
  21 };
  22
  23 struct btree_write_bio {
  24         void                    *data;
  25         struct work_struct      work;
  26         struct bch_write_bio    wbio;
  27 };
  28
  29 static inline void btree_node_io_unlock(struct btree *b)
  30 {
  31         EBUG_ON(!btree_node_write_in_flight(b));
  32         clear_btree_node_write_in_flight(b);
  33         wake_up_bit(&b->flags, BTREE_NODE_write_in_flight);
  34 }
  35
  36 static inline void btree_node_io_lock(struct btree *b)
  37 {
  38         wait_on_bit_lock_io(&b->flags, BTREE_NODE_write_in_flight,
  39                             TASK_UNINTERRUPTIBLE);
  40 }
  41
  42 static inline void btree_node_wait_on_io(struct btree *b)
  43 {
  44         wait_on_bit_io(&b->flags, BTREE_NODE_write_in_flight,
  45                        TASK_UNINTERRUPTIBLE);
  46 }
  47
  48 static inline bool btree_node_may_write(struct btree *b)
  49 {
  50         return list_empty_careful(&b->write_blocked) &&
  51                 (!b->written || !b->will_make_reachable);
  52 }
  53
  54 enum compact_mode {
  55         COMPACT_LAZY,
  56         COMPACT_WRITTEN,
  57         COMPACT_WRITTEN_NO_WRITE_LOCK,
  58 };
  59
  60 bool __bch2_compact_whiteouts(struct bch_fs *, struct btree *, enum compact_mode);
  61
  62 static inline unsigned should_compact_bset_lazy(struct btree *b, struct bset_tree *t)
  63 {
  64         unsigned bset_u64s = le16_to_cpu(bset(b, t)->u64s);
  65         unsigned dead_u64s = bset_u64s - b->nr.bset_u64s[t - b->set];
  66
  67         return dead_u64s > 128 && dead_u64s * 3 > bset_u64s;
  68 }
  69
  70 static inline bool bch2_maybe_compact_whiteouts(struct bch_fs *c, struct btree *b)
  71 {
  72         struct bset_tree *t;
  73
  74         for_each_bset(b, t)
  75                 if (should_compact_bset_lazy(b, t))
  76                         return __bch2_compact_whiteouts(c, b, COMPACT_LAZY);
  77
  78         return false;
  79 }
  80
  81 void bch2_btree_sort_into(struct bch_fs *, struct btree *, struct btree *);
  82
  83 void bch2_btree_build_aux_trees(struct btree *);
  84 void bch2_btree_init_next(struct bch_fs *, struct btree *,
  85                          struct btree_iter *);
  86
  87 int bch2_btree_node_read_done(struct bch_fs *, struct btree *, bool);
  88 void bch2_btree_node_read(struct bch_fs *, struct btree *, bool);
  89 int bch2_btree_root_read(struct bch_fs *, enum btree_id,
  90                          const struct bkey_i *, unsigned);
  91
  92 void bch2_btree_complete_write(struct bch_fs *, struct btree *,
  93                               struct btree_write *);
  94 void bch2_btree_write_error_work(struct work_struct *);
  95
  96 void __bch2_btree_node_write(struct bch_fs *, struct btree *,
  97                             enum six_lock_type);
  98 bool bch2_btree_post_write_cleanup(struct bch_fs *, struct btree *);
  99
 100 void bch2_btree_node_write(struct bch_fs *, struct btree *,
 101                           enum six_lock_type);
 102
 103 static inline void btree_node_write_if_need(struct bch_fs *c, struct btree *b)
 104 {
 105         while (b->written &&
 106                btree_node_need_write(b) &&
 107                btree_node_may_write(b)) {
 108                 if (!btree_node_write_in_flight(b)) {
 109                         bch2_btree_node_write(c, b, SIX_LOCK_read);
 110                         break;
 111                 }
 112
 113                 six_unlock_read(&b->lock);
 114                 btree_node_wait_on_io(b);
 115                 btree_node_lock_type(c, b, SIX_LOCK_read);
 116         }
 117 }
 118
 119 #define bch2_btree_node_write_cond(_c, _b, cond)                        \
 120 do {                                                                    \
 121         unsigned long old, new, v = READ_ONCE((_b)->flags);             \
 122                                                                         \
 123         do {                                                            \
 124                 old = new = v;                                          \
 125                                                                         \
 126                 if (!(old & (1 << BTREE_NODE_dirty)) || !(cond))        \
 127                         break;                                          \
 128                                                                         \
 129                 new |= (1 << BTREE_NODE_need_write);                    \
 130         } while ((v = cmpxchg(&(_b)->flags, old, new)) != old);         \
 131                                                                         \
 132         btree_node_write_if_need(_c, _b);                               \
 133 } while (0)
 134
 135 void bch2_btree_flush_all_reads(struct bch_fs *);
 136 void bch2_btree_flush_all_writes(struct bch_fs *);
 137 void bch2_btree_verify_flushed(struct bch_fs *);
 138 ssize_t bch2_dirty_btree_nodes_print(struct bch_fs *, char *);
 139
 140 #endif /* _BCACHEFS_BTREE_IO_H */