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

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _BCACHEFS_SB_MEMBERS_H
   3 #define _BCACHEFS_SB_MEMBERS_H
   4
   5 extern char * const bch2_member_error_strs[];
   6
   7 int bch2_sb_members_v2_init(struct bch_fs *c);
   8 int bch2_sb_members_cpy_v2_v1(struct bch_sb_handle *disk_sb);
   9 struct bch_member *bch2_members_v2_get_mut(struct bch_sb *sb, int i);
  10 struct bch_member bch2_sb_member_get(struct bch_sb *sb, int i);
  11
  12 static inline bool bch2_dev_is_online(struct bch_dev *ca)
  13 {
  14         return !percpu_ref_is_zero(&ca->io_ref);
  15 }
  16
  17 static inline bool bch2_dev_is_readable(struct bch_dev *ca)
  18 {
  19         return bch2_dev_is_online(ca) &&
  20                 ca->mi.state != BCH_MEMBER_STATE_failed;
  21 }
  22
  23 static inline bool bch2_dev_get_ioref(struct bch_dev *ca, int rw)
  24 {
  25         if (!percpu_ref_tryget(&ca->io_ref))
  26                 return false;
  27
  28         if (ca->mi.state == BCH_MEMBER_STATE_rw ||
  29             (ca->mi.state == BCH_MEMBER_STATE_ro && rw == READ))
  30                 return true;
  31
  32         percpu_ref_put(&ca->io_ref);
  33         return false;
  34 }
  35
  36 static inline unsigned dev_mask_nr(const struct bch_devs_mask *devs)
  37 {
  38         return bitmap_weight(devs->d, BCH_SB_MEMBERS_MAX);
  39 }
  40
  41 static inline bool bch2_dev_list_has_dev(struct bch_devs_list devs,
  42                                          unsigned dev)
  43 {
  44         unsigned i;
  45
  46         for (i = 0; i < devs.nr; i++)
  47                 if (devs.devs[i] == dev)
  48                         return true;
  49
  50         return false;
  51 }
  52
  53 static inline void bch2_dev_list_drop_dev(struct bch_devs_list *devs,
  54                                           unsigned dev)
  55 {
  56         unsigned i;
  57
  58         for (i = 0; i < devs->nr; i++)
  59                 if (devs->devs[i] == dev) {
  60                         array_remove_item(devs->devs, devs->nr, i);
  61                         return;
  62                 }
  63 }
  64
  65 static inline void bch2_dev_list_add_dev(struct bch_devs_list *devs,
  66                                          unsigned dev)
  67 {
  68         if (!bch2_dev_list_has_dev(*devs, dev)) {
  69                 BUG_ON(devs->nr >= ARRAY_SIZE(devs->devs));
  70                 devs->devs[devs->nr++] = dev;
  71         }
  72 }
  73
  74 static inline struct bch_devs_list bch2_dev_list_single(unsigned dev)
  75 {
  76         return (struct bch_devs_list) { .nr = 1, .devs[0] = dev };
  77 }
  78
  79 static inline struct bch_dev *__bch2_next_dev(struct bch_fs *c, unsigned *iter,
  80                                               const struct bch_devs_mask *mask)
  81 {
  82         struct bch_dev *ca = NULL;
  83
  84         while ((*iter = mask
  85                 ? find_next_bit(mask->d, c->sb.nr_devices, *iter)
  86                 : *iter) < c->sb.nr_devices &&
  87                !(ca = rcu_dereference_check(c->devs[*iter],
  88                                             lockdep_is_held(&c->state_lock))))
  89                 (*iter)++;
  90
  91         return ca;
  92 }
  93
  94 #define for_each_member_device_rcu(ca, c, iter, mask)                   \
  95         for ((iter) = 0; ((ca) = __bch2_next_dev((c), &(iter), mask)); (iter)++)
  96
  97 static inline struct bch_dev *bch2_get_next_dev(struct bch_fs *c, unsigned *iter)
  98 {
  99         struct bch_dev *ca;
 100
 101         rcu_read_lock();
 102         if ((ca = __bch2_next_dev(c, iter, NULL)))
 103                 percpu_ref_get(&ca->ref);
 104         rcu_read_unlock();
 105
 106         return ca;
 107 }
 108
 109 /*
 110  * If you break early, you must drop your ref on the current device
 111  */
 112 #define for_each_member_device(ca, c, iter)                             \
 113         for ((iter) = 0;                                                \
 114              (ca = bch2_get_next_dev(c, &(iter)));                      \
 115              percpu_ref_put(&ca->ref), (iter)++)
 116
 117 static inline struct bch_dev *bch2_get_next_online_dev(struct bch_fs *c,
 118                                                       unsigned *iter,
 119                                                       int state_mask)
 120 {
 121         struct bch_dev *ca;
 122
 123         rcu_read_lock();
 124         while ((ca = __bch2_next_dev(c, iter, NULL)) &&
 125                (!((1 << ca->mi.state) & state_mask) ||
 126                 !percpu_ref_tryget(&ca->io_ref)))
 127                 (*iter)++;
 128         rcu_read_unlock();
 129
 130         return ca;
 131 }
 132
 133 #define __for_each_online_member(ca, c, iter, state_mask)               \
 134         for ((iter) = 0;                                                \
 135              (ca = bch2_get_next_online_dev(c, &(iter), state_mask));   \
 136              percpu_ref_put(&ca->io_ref), (iter)++)
 137
 138 #define for_each_online_member(ca, c, iter)                             \
 139         __for_each_online_member(ca, c, iter, ~0)
 140
 141 #define for_each_rw_member(ca, c, iter)                                 \
 142         __for_each_online_member(ca, c, iter, 1 << BCH_MEMBER_STATE_rw)
 143
 144 #define for_each_readable_member(ca, c, iter)                           \
 145         __for_each_online_member(ca, c, iter,                           \
 146                 (1 << BCH_MEMBER_STATE_rw)|(1 << BCH_MEMBER_STATE_ro))
 147
 148 /*
 149  * If a key exists that references a device, the device won't be going away and
 150  * we can omit rcu_read_lock():
 151  */
 152 static inline struct bch_dev *bch_dev_bkey_exists(const struct bch_fs *c, unsigned idx)
 153 {
 154         EBUG_ON(idx >= c->sb.nr_devices || !c->devs[idx]);
 155
 156         return rcu_dereference_check(c->devs[idx], 1);
 157 }
 158
 159 static inline struct bch_dev *bch_dev_locked(struct bch_fs *c, unsigned idx)
 160 {
 161         EBUG_ON(idx >= c->sb.nr_devices || !c->devs[idx]);
 162
 163         return rcu_dereference_protected(c->devs[idx],
 164                                          lockdep_is_held(&c->sb_lock) ||
 165                                          lockdep_is_held(&c->state_lock));
 166 }
 167
 168 /* XXX kill, move to struct bch_fs */
 169 static inline struct bch_devs_mask bch2_online_devs(struct bch_fs *c)
 170 {
 171         struct bch_devs_mask devs;
 172         struct bch_dev *ca;
 173         unsigned i;
 174
 175         memset(&devs, 0, sizeof(devs));
 176         for_each_online_member(ca, c, i)
 177                 __set_bit(ca->dev_idx, devs.d);
 178         return devs;
 179 }
 180
 181 extern const struct bch_sb_field_ops bch_sb_field_ops_members_v1;
 182 extern const struct bch_sb_field_ops bch_sb_field_ops_members_v2;
 183
 184 static inline bool bch2_member_exists(struct bch_member *m)
 185 {
 186         return !bch2_is_zero(&m->uuid, sizeof(m->uuid));
 187 }
 188
 189 static inline bool bch2_dev_exists(struct bch_sb *sb,
 190                                    unsigned dev)
 191 {
 192         if (dev < sb->nr_devices) {
 193         struct bch_member m = bch2_sb_member_get(sb, dev);
 194                 return bch2_member_exists(&m);
 195         }
 196         return false;
 197 }
 198
 199 static inline struct bch_member_cpu bch2_mi_to_cpu(struct bch_member *mi)
 200 {
 201         return (struct bch_member_cpu) {
 202                 .nbuckets       = le64_to_cpu(mi->nbuckets),
 203                 .first_bucket   = le16_to_cpu(mi->first_bucket),
 204                 .bucket_size    = le16_to_cpu(mi->bucket_size),
 205                 .group          = BCH_MEMBER_GROUP(mi),
 206                 .state          = BCH_MEMBER_STATE(mi),
 207                 .discard        = BCH_MEMBER_DISCARD(mi),
 208                 .data_allowed   = BCH_MEMBER_DATA_ALLOWED(mi),
 209                 .durability     = BCH_MEMBER_DURABILITY(mi)
 210                         ? BCH_MEMBER_DURABILITY(mi) - 1
 211                         : 1,
 212                 .freespace_initialized = BCH_MEMBER_FREESPACE_INITIALIZED(mi),
 213                 .valid          = bch2_member_exists(mi),
 214         };
 215 }
 216
 217 void bch2_sb_members_from_cpu(struct bch_fs *);
 218
 219 void bch2_dev_io_errors_to_text(struct printbuf *, struct bch_dev *);
 220 void bch2_dev_errors_reset(struct bch_dev *);
 221
 222 #endif /* _BCACHEFS_SB_MEMBERS_H */