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

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _BCACHEFS_BTREE_IO_H
   3 #define _BCACHEFS_BTREE_IO_H
   4
   5 #include "bset.h"
   6 #include "btree_locking.h"
   7 #include "extents.h"
   8 #include "io_types.h"
   9
  10 struct bch_fs;
  11 struct btree_write;
  12 struct btree;
  13 struct btree_iter;
  14
  15 struct btree_read_bio {
  16         struct bch_fs           *c;
  17         u64                     start_time;
  18         unsigned                have_ioref:1;
  19         struct extent_ptr_decoded       pick;
  20         struct work_struct      work;
  21         struct bio              bio;
  22 };
  23
  24 struct btree_write_bio {
  25         void                    *data;
  26         struct work_struct      work;
  27         struct bch_write_bio    wbio;
  28 };
  29
  30 static inline void btree_node_io_unlock(struct btree *b)
  31 {
  32         EBUG_ON(!btree_node_write_in_flight(b));
  33         clear_btree_node_write_in_flight(b);
  34         wake_up_bit(&b->flags, BTREE_NODE_write_in_flight);
  35 }
  36
  37 static inline void btree_node_io_lock(struct btree *b)
  38 {
  39         wait_on_bit_lock_io(&b->flags, BTREE_NODE_write_in_flight,
  40                             TASK_UNINTERRUPTIBLE);
  41 }
  42
  43 static inline void btree_node_wait_on_io(struct btree *b)
  44 {
  45         wait_on_bit_io(&b->flags, BTREE_NODE_write_in_flight,
  46                        TASK_UNINTERRUPTIBLE);
  47 }
  48
  49 static inline bool btree_node_may_write(struct btree *b)
  50 {
  51         return list_empty_careful(&b->write_blocked) &&
  52                 (!b->written || !b->will_make_reachable);
  53 }
  54
  55 enum compact_mode {
  56         COMPACT_LAZY,
  57         COMPACT_WRITTEN,
  58         COMPACT_WRITTEN_NO_WRITE_LOCK,
  59 };
  60
  61 bool __bch2_compact_whiteouts(struct bch_fs *, struct btree *, enum compact_mode);
  62
  63 static inline unsigned should_compact_bset_lazy(struct btree *b, struct bset_tree *t)
  64 {
  65         unsigned total_u64s = bset_u64s(t);
  66         unsigned dead_u64s = total_u64s - b->nr.bset_u64s[t - b->set];
  67
  68         return dead_u64s > 64 && dead_u64s * 3 > total_u64s;
  69 }
  70
  71 static inline bool bch2_maybe_compact_whiteouts(struct bch_fs *c, struct btree *b)
  72 {
  73         struct bset_tree *t;
  74
  75         for_each_bset(b, t)
  76                 if (should_compact_bset_lazy(b, t))
  77                         return __bch2_compact_whiteouts(c, b, COMPACT_LAZY);
  78
  79         return false;
  80 }
  81
  82 void bch2_btree_sort_into(struct bch_fs *, struct btree *, struct btree *);
  83
  84 void bch2_btree_build_aux_trees(struct btree *);
  85 void bch2_btree_init_next(struct bch_fs *, struct btree *,
  86                          struct btree_iter *);
  87
  88 int bch2_btree_node_read_done(struct bch_fs *, struct btree *, bool);
  89 void bch2_btree_node_read(struct bch_fs *, struct btree *, bool);
  90 int bch2_btree_root_read(struct bch_fs *, enum btree_id,
  91                          const struct bkey_i *, unsigned);
  92
  93 void bch2_btree_complete_write(struct bch_fs *, struct btree *,
  94                               struct btree_write *);
  95 void bch2_btree_write_error_work(struct work_struct *);
  96
  97 void __bch2_btree_node_write(struct bch_fs *, struct btree *,
  98                             enum six_lock_type);
  99 bool bch2_btree_post_write_cleanup(struct bch_fs *, struct btree *);
 100
 101 void bch2_btree_node_write(struct bch_fs *, struct btree *,
 102                           enum six_lock_type);
 103
 104 static inline void btree_node_write_if_need(struct bch_fs *c, struct btree *b)
 105 {
 106         while (b->written &&
 107                btree_node_need_write(b) &&
 108                btree_node_may_write(b)) {
 109                 if (!btree_node_write_in_flight(b)) {
 110                         bch2_btree_node_write(c, b, SIX_LOCK_read);
 111                         break;
 112                 }
 113
 114                 six_unlock_read(&b->lock);
 115                 btree_node_wait_on_io(b);
 116                 btree_node_lock_type(c, b, SIX_LOCK_read);
 117         }
 118 }
 119
 120 #define bch2_btree_node_write_cond(_c, _b, cond)                        \
 121 do {                                                                    \
 122         unsigned long old, new, v = READ_ONCE((_b)->flags);             \
 123                                                                         \
 124         do {                                                            \
 125                 old = new = v;                                          \
 126                                                                         \
 127                 if (!(old & (1 << BTREE_NODE_dirty)) || !(cond))        \
 128                         break;                                          \
 129                                                                         \
 130                 new |= (1 << BTREE_NODE_need_write);                    \
 131         } while ((v = cmpxchg(&(_b)->flags, old, new)) != old);         \
 132                                                                         \
 133         btree_node_write_if_need(_c, _b);                               \
 134 } while (0)
 135
 136 void bch2_btree_flush_all_reads(struct bch_fs *);
 137 void bch2_btree_flush_all_writes(struct bch_fs *);
 138 void bch2_btree_verify_flushed(struct bch_fs *);
 139 ssize_t bch2_dirty_btree_nodes_print(struct bch_fs *, char *);
 140
 141 #endif /* _BCACHEFS_BTREE_IO_H */