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 static inline struct bch_member *
   8 __bch2_members_v2_get_mut(struct bch_sb_field_members_v2 *mi, unsigned i)
   9 {
  10         return (void *) mi->_members + (i * le16_to_cpu(mi->member_bytes));
  11 }
  12
  13 int bch2_sb_members_v2_init(struct bch_fs *c);
  14 int bch2_sb_members_cpy_v2_v1(struct bch_sb_handle *disk_sb);
  15 struct bch_member *bch2_members_v2_get_mut(struct bch_sb *sb, int i);
  16 struct bch_member bch2_sb_member_get(struct bch_sb *sb, int i);
  17
  18 static inline bool bch2_dev_is_online(struct bch_dev *ca)
  19 {
  20         return !percpu_ref_is_zero(&ca->io_ref);
  21 }
  22
  23 static inline bool bch2_dev_is_readable(struct bch_dev *ca)
  24 {
  25         return bch2_dev_is_online(ca) &&
  26                 ca->mi.state != BCH_MEMBER_STATE_failed;
  27 }
  28
  29 static inline bool bch2_dev_get_ioref(struct bch_dev *ca, int rw)
  30 {
  31         if (!percpu_ref_tryget(&ca->io_ref))
  32                 return false;
  33
  34         if (ca->mi.state == BCH_MEMBER_STATE_rw ||
  35             (ca->mi.state == BCH_MEMBER_STATE_ro && rw == READ))
  36                 return true;
  37
  38         percpu_ref_put(&ca->io_ref);
  39         return false;
  40 }
  41
  42 static inline unsigned dev_mask_nr(const struct bch_devs_mask *devs)
  43 {
  44         return bitmap_weight(devs->d, BCH_SB_MEMBERS_MAX);
  45 }
  46
  47 static inline bool bch2_dev_list_has_dev(struct bch_devs_list devs,
  48                                          unsigned dev)
  49 {
  50         unsigned i;
  51
  52         for (i = 0; i < devs.nr; i++)
  53                 if (devs.devs[i] == dev)
  54                         return true;
  55
  56         return false;
  57 }
  58
  59 static inline void bch2_dev_list_drop_dev(struct bch_devs_list *devs,
  60                                           unsigned dev)
  61 {
  62         unsigned i;
  63
  64         for (i = 0; i < devs->nr; i++)
  65                 if (devs->devs[i] == dev) {
  66                         array_remove_item(devs->devs, devs->nr, i);
  67                         return;
  68                 }
  69 }
  70
  71 static inline void bch2_dev_list_add_dev(struct bch_devs_list *devs,
  72                                          unsigned dev)
  73 {
  74         if (!bch2_dev_list_has_dev(*devs, dev)) {
  75                 BUG_ON(devs->nr >= ARRAY_SIZE(devs->devs));
  76                 devs->devs[devs->nr++] = dev;
  77         }
  78 }
  79
  80 static inline struct bch_devs_list bch2_dev_list_single(unsigned dev)
  81 {
  82         return (struct bch_devs_list) { .nr = 1, .devs[0] = dev };
  83 }
  84
  85 static inline struct bch_dev *__bch2_next_dev(struct bch_fs *c, unsigned *iter,
  86                                               const struct bch_devs_mask *mask)
  87 {
  88         struct bch_dev *ca = NULL;
  89
  90         while ((*iter = mask
  91                 ? find_next_bit(mask->d, c->sb.nr_devices, *iter)
  92                 : *iter) < c->sb.nr_devices &&
  93                !(ca = rcu_dereference_check(c->devs[*iter],
  94                                             lockdep_is_held(&c->state_lock))))
  95                 (*iter)++;
  96
  97         return ca;
  98 }
  99
 100 #define for_each_member_device_rcu(ca, c, iter, mask)                   \
 101         for ((iter) = 0; ((ca) = __bch2_next_dev((c), &(iter), mask)); (iter)++)
 102
 103 static inline struct bch_dev *bch2_get_next_dev(struct bch_fs *c, unsigned *iter)
 104 {
 105         struct bch_dev *ca;
 106
 107         rcu_read_lock();
 108         if ((ca = __bch2_next_dev(c, iter, NULL)))
 109                 percpu_ref_get(&ca->ref);
 110         rcu_read_unlock();
 111
 112         return ca;
 113 }
 114
 115 /*
 116  * If you break early, you must drop your ref on the current device
 117  */
 118 #define for_each_member_device(ca, c, iter)                             \
 119         for ((iter) = 0;                                                \
 120              (ca = bch2_get_next_dev(c, &(iter)));                      \
 121              percpu_ref_put(&ca->ref), (iter)++)
 122
 123 static inline struct bch_dev *bch2_get_next_online_dev(struct bch_fs *c,
 124                                                       unsigned *iter,
 125                                                       int state_mask)
 126 {
 127         struct bch_dev *ca;
 128
 129         rcu_read_lock();
 130         while ((ca = __bch2_next_dev(c, iter, NULL)) &&
 131                (!((1 << ca->mi.state) & state_mask) ||
 132                 !percpu_ref_tryget(&ca->io_ref)))
 133                 (*iter)++;
 134         rcu_read_unlock();
 135
 136         return ca;
 137 }
 138
 139 #define __for_each_online_member(ca, c, iter, state_mask)               \
 140         for ((iter) = 0;                                                \
 141              (ca = bch2_get_next_online_dev(c, &(iter), state_mask));   \
 142              percpu_ref_put(&ca->io_ref), (iter)++)
 143
 144 #define for_each_online_member(ca, c, iter)                             \
 145         __for_each_online_member(ca, c, iter, ~0)
 146
 147 #define for_each_rw_member(ca, c, iter)                                 \
 148         __for_each_online_member(ca, c, iter, 1 << BCH_MEMBER_STATE_rw)
 149
 150 #define for_each_readable_member(ca, c, iter)                           \
 151         __for_each_online_member(ca, c, iter,                           \
 152                 (1 << BCH_MEMBER_STATE_rw)|(1 << BCH_MEMBER_STATE_ro))
 153
 154 /*
 155  * If a key exists that references a device, the device won't be going away and
 156  * we can omit rcu_read_lock():
 157  */
 158 static inline struct bch_dev *bch_dev_bkey_exists(const struct bch_fs *c, unsigned idx)
 159 {
 160         EBUG_ON(idx >= c->sb.nr_devices || !c->devs[idx]);
 161
 162         return rcu_dereference_check(c->devs[idx], 1);
 163 }
 164
 165 static inline struct bch_dev *bch_dev_locked(struct bch_fs *c, unsigned idx)
 166 {
 167         EBUG_ON(idx >= c->sb.nr_devices || !c->devs[idx]);
 168
 169         return rcu_dereference_protected(c->devs[idx],
 170                                          lockdep_is_held(&c->sb_lock) ||
 171                                          lockdep_is_held(&c->state_lock));
 172 }
 173
 174 /* XXX kill, move to struct bch_fs */
 175 static inline struct bch_devs_mask bch2_online_devs(struct bch_fs *c)
 176 {
 177         struct bch_devs_mask devs;
 178         struct bch_dev *ca;
 179         unsigned i;
 180
 181         memset(&devs, 0, sizeof(devs));
 182         for_each_online_member(ca, c, i)
 183                 __set_bit(ca->dev_idx, devs.d);
 184         return devs;
 185 }
 186
 187 extern const struct bch_sb_field_ops bch_sb_field_ops_members_v1;
 188 extern const struct bch_sb_field_ops bch_sb_field_ops_members_v2;
 189
 190 static inline bool bch2_member_exists(struct bch_member *m)
 191 {
 192         return !bch2_is_zero(&m->uuid, sizeof(m->uuid));
 193 }
 194
 195 static inline bool bch2_dev_exists(struct bch_sb *sb, unsigned dev)
 196 {
 197         if (dev < sb->nr_devices) {
 198                 struct bch_member m = bch2_sb_member_get(sb, dev);
 199                 return bch2_member_exists(&m);
 200         }
 201         return false;
 202 }
 203
 204 static inline struct bch_member_cpu bch2_mi_to_cpu(struct bch_member *mi)
 205 {
 206         return (struct bch_member_cpu) {
 207                 .nbuckets       = le64_to_cpu(mi->nbuckets),
 208                 .first_bucket   = le16_to_cpu(mi->first_bucket),
 209                 .bucket_size    = le16_to_cpu(mi->bucket_size),
 210                 .group          = BCH_MEMBER_GROUP(mi),
 211                 .state          = BCH_MEMBER_STATE(mi),
 212                 .discard        = BCH_MEMBER_DISCARD(mi),
 213                 .data_allowed   = BCH_MEMBER_DATA_ALLOWED(mi),
 214                 .durability     = BCH_MEMBER_DURABILITY(mi)
 215                         ? BCH_MEMBER_DURABILITY(mi) - 1
 216                         : 1,
 217                 .freespace_initialized = BCH_MEMBER_FREESPACE_INITIALIZED(mi),
 218                 .valid          = bch2_member_exists(mi),
 219         };
 220 }
 221
 222 void bch2_sb_members_from_cpu(struct bch_fs *);
 223
 224 void bch2_dev_io_errors_to_text(struct printbuf *, struct bch_dev *);
 225 void bch2_dev_errors_reset(struct bch_dev *);
 226
 227 #endif /* _BCACHEFS_SB_MEMBERS_H */