fs/bcachefs/lru.c

   1 // SPDX-License-Identifier: GPL-2.0
   2
   3 #include "bcachefs.h"
   4 #include "alloc_background.h"
   5 #include "btree_iter.h"
   6 #include "btree_update.h"
   7 #include "btree_write_buffer.h"
   8 #include "error.h"
   9 #include "lru.h"
  10 #include "recovery.h"
  11
  12 /* KEY_TYPE_lru is obsolete: */
  13 int bch2_lru_invalid(struct bch_fs *c, struct bkey_s_c k,
  14                      enum bch_validate_flags flags,
  15                      struct printbuf *err)
  16 {
  17         int ret = 0;
  18
  19         bkey_fsck_err_on(!lru_pos_time(k.k->p), c, err,
  20                          lru_entry_at_time_0,
  21                          "lru entry at time=0");
  22 fsck_err:
  23         return ret;
  24 }
  25
  26 void bch2_lru_to_text(struct printbuf *out, struct bch_fs *c,
  27                       struct bkey_s_c k)
  28 {
  29         const struct bch_lru *lru = bkey_s_c_to_lru(k).v;
  30
  31         prt_printf(out, "idx %llu", le64_to_cpu(lru->idx));
  32 }
  33
  34 void bch2_lru_pos_to_text(struct printbuf *out, struct bpos lru)
  35 {
  36         prt_printf(out, "%llu:%llu -> %llu:%llu",
  37                    lru_pos_id(lru),
  38                    lru_pos_time(lru),
  39                    u64_to_bucket(lru.offset).inode,
  40                    u64_to_bucket(lru.offset).offset);
  41 }
  42
  43 static int __bch2_lru_set(struct btree_trans *trans, u16 lru_id,
  44                           u64 dev_bucket, u64 time, bool set)
  45 {
  46         return time
  47                 ? bch2_btree_bit_mod_buffered(trans, BTREE_ID_lru,
  48                                               lru_pos(lru_id, dev_bucket, time), set)
  49                 : 0;
  50 }
  51
  52 int bch2_lru_del(struct btree_trans *trans, u16 lru_id, u64 dev_bucket, u64 time)
  53 {
  54         return __bch2_lru_set(trans, lru_id, dev_bucket, time, KEY_TYPE_deleted);
  55 }
  56
  57 int bch2_lru_set(struct btree_trans *trans, u16 lru_id, u64 dev_bucket, u64 time)
  58 {
  59         return __bch2_lru_set(trans, lru_id, dev_bucket, time, KEY_TYPE_set);
  60 }
  61
  62 int bch2_lru_change(struct btree_trans *trans,
  63                     u16 lru_id, u64 dev_bucket,
  64                     u64 old_time, u64 new_time)
  65 {
  66         if (old_time == new_time)
  67                 return 0;
  68
  69         return  bch2_lru_del(trans, lru_id, dev_bucket, old_time) ?:
  70                 bch2_lru_set(trans, lru_id, dev_bucket, new_time);
  71 }
  72
  73 static const char * const bch2_lru_types[] = {
  74 #define x(n) #n,
  75         BCH_LRU_TYPES()
  76 #undef x
  77         NULL
  78 };
  79
  80 static int bch2_check_lru_key(struct btree_trans *trans,
  81                               struct btree_iter *lru_iter,
  82                               struct bkey_s_c lru_k,
  83                               struct bpos *last_flushed_pos)
  84 {
  85         struct bch_fs *c = trans->c;
  86         struct btree_iter iter;
  87         struct bkey_s_c k;
  88         struct bch_alloc_v4 a_convert;
  89         const struct bch_alloc_v4 *a;
  90         struct printbuf buf1 = PRINTBUF;
  91         struct printbuf buf2 = PRINTBUF;
  92         enum bch_lru_type type = lru_type(lru_k);
  93         struct bpos alloc_pos = u64_to_bucket(lru_k.k->p.offset);
  94         u64 idx;
  95         int ret;
  96
  97         if (fsck_err_on(!bch2_dev_bucket_exists(c, alloc_pos), c,
  98                         lru_entry_to_invalid_bucket,
  99                         "lru key points to nonexistent device:bucket %llu:%llu",
 100                         alloc_pos.inode, alloc_pos.offset))
 101                 return bch2_btree_delete_at(trans, lru_iter, 0);
 102
 103         k = bch2_bkey_get_iter(trans, &iter, BTREE_ID_alloc, alloc_pos, 0);
 104         ret = bkey_err(k);
 105         if (ret)
 106                 goto err;
 107
 108         a = bch2_alloc_to_v4(k, &a_convert);
 109
 110         switch (type) {
 111         case BCH_LRU_read:
 112                 idx = alloc_lru_idx_read(*a);
 113                 break;
 114         case BCH_LRU_fragmentation:
 115                 idx = a->fragmentation_lru;
 116                 break;
 117         }
 118
 119         if (lru_k.k->type != KEY_TYPE_set ||
 120             lru_pos_time(lru_k.k->p) != idx) {
 121                 if (!bpos_eq(*last_flushed_pos, lru_k.k->p)) {
 122                         *last_flushed_pos = lru_k.k->p;
 123                         ret = bch2_btree_write_buffer_flush_sync(trans) ?:
 124                                 -BCH_ERR_transaction_restart_write_buffer_flush;
 125                         goto out;
 126                 }
 127
 128                 if (fsck_err(c, lru_entry_bad,
 129                              "incorrect lru entry: lru %s time %llu\n"
 130                              "  %s\n"
 131                              "  for %s",
 132                              bch2_lru_types[type],
 133                              lru_pos_time(lru_k.k->p),
 134                              (bch2_bkey_val_to_text(&buf1, c, lru_k), buf1.buf),
 135                              (bch2_bkey_val_to_text(&buf2, c, k), buf2.buf)))
 136                         ret = bch2_btree_delete_at(trans, lru_iter, 0);
 137         }
 138 out:
 139 err:
 140 fsck_err:
 141         bch2_trans_iter_exit(trans, &iter);
 142         printbuf_exit(&buf2);
 143         printbuf_exit(&buf1);
 144         return ret;
 145 }
 146
 147 int bch2_check_lrus(struct bch_fs *c)
 148 {
 149         struct bpos last_flushed_pos = POS_MIN;
 150         int ret = bch2_trans_run(c,
 151                 for_each_btree_key_commit(trans, iter,
 152                                 BTREE_ID_lru, POS_MIN, BTREE_ITER_prefetch, k,
 153                                 NULL, NULL, BCH_TRANS_COMMIT_no_enospc|BCH_TRANS_COMMIT_lazy_rw,
 154                         bch2_check_lru_key(trans, &iter, k, &last_flushed_pos)));
 155         bch_err_fn(c, ret);
 156         return ret;
 157
 158 }