fs/bcachefs/sb-counters.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include "bcachefs.h"
   3 #include "super-io.h"
   4 #include "sb-counters.h"
   5
   6 /* BCH_SB_FIELD_counters */
   7
   8 static const char * const bch2_counter_names[] = {
   9 #define x(t, n, ...) (#t),
  10         BCH_PERSISTENT_COUNTERS()
  11 #undef x
  12         NULL
  13 };
  14
  15 static size_t bch2_sb_counter_nr_entries(struct bch_sb_field_counters *ctrs)
  16 {
  17         if (!ctrs)
  18                 return 0;
  19
  20         return (__le64 *) vstruct_end(&ctrs->field) - &ctrs->d[0];
  21 };
  22
  23 static int bch2_sb_counters_validate(struct bch_sb *sb, struct bch_sb_field *f,
  24                                 enum bch_validate_flags flags, struct printbuf *err)
  25 {
  26         return 0;
  27 };
  28
  29 static void bch2_sb_counters_to_text(struct printbuf *out, struct bch_sb *sb,
  30                               struct bch_sb_field *f)
  31 {
  32         struct bch_sb_field_counters *ctrs = field_to_type(f, counters);
  33         unsigned int nr = bch2_sb_counter_nr_entries(ctrs);
  34
  35         for (unsigned i = 0; i < nr; i++)
  36                 prt_printf(out, "%s \t%llu\n",
  37                            i < BCH_COUNTER_NR ? bch2_counter_names[i] : "(unknown)",
  38                            le64_to_cpu(ctrs->d[i]));
  39 };
  40
  41 int bch2_sb_counters_to_cpu(struct bch_fs *c)
  42 {
  43         struct bch_sb_field_counters *ctrs = bch2_sb_field_get(c->disk_sb.sb, counters);
  44         unsigned int i;
  45         unsigned int nr = bch2_sb_counter_nr_entries(ctrs);
  46         u64 val = 0;
  47
  48         for (i = 0; i < BCH_COUNTER_NR; i++)
  49                 c->counters_on_mount[i] = 0;
  50
  51         for (i = 0; i < min_t(unsigned int, nr, BCH_COUNTER_NR); i++) {
  52                 val = le64_to_cpu(ctrs->d[i]);
  53                 percpu_u64_set(&c->counters[i], val);
  54                 c->counters_on_mount[i] = val;
  55         }
  56         return 0;
  57 };
  58
  59 int bch2_sb_counters_from_cpu(struct bch_fs *c)
  60 {
  61         struct bch_sb_field_counters *ctrs = bch2_sb_field_get(c->disk_sb.sb, counters);
  62         struct bch_sb_field_counters *ret;
  63         unsigned int i;
  64         unsigned int nr = bch2_sb_counter_nr_entries(ctrs);
  65
  66         if (nr < BCH_COUNTER_NR) {
  67                 ret = bch2_sb_field_resize(&c->disk_sb, counters,
  68                                                sizeof(*ctrs) / sizeof(u64) + BCH_COUNTER_NR);
  69
  70                 if (ret) {
  71                         ctrs = ret;
  72                         nr = bch2_sb_counter_nr_entries(ctrs);
  73                 }
  74         }
  75
  76
  77         for (i = 0; i < min_t(unsigned int, nr, BCH_COUNTER_NR); i++)
  78                 ctrs->d[i] = cpu_to_le64(percpu_u64_get(&c->counters[i]));
  79         return 0;
  80 }
  81
  82 void bch2_fs_counters_exit(struct bch_fs *c)
  83 {
  84         free_percpu(c->counters);
  85 }
  86
  87 int bch2_fs_counters_init(struct bch_fs *c)
  88 {
  89         c->counters = __alloc_percpu(sizeof(u64) * BCH_COUNTER_NR, sizeof(u64));
  90         if (!c->counters)
  91                 return -BCH_ERR_ENOMEM_fs_counters_init;
  92
  93         return bch2_sb_counters_to_cpu(c);
  94 }
  95
  96 const struct bch_sb_field_ops bch_sb_field_ops_counters = {
  97         .validate       = bch2_sb_counters_validate,
  98         .to_text        = bch2_sb_counters_to_text,
  99 };