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_idx(struct bch_fs *c, unsigned idx,
  86                                                   const struct bch_devs_mask *mask)
  87 {
  88         struct bch_dev *ca = NULL;
  89
  90         while ((idx = mask
  91                 ? find_next_bit(mask->d, c->sb.nr_devices, idx)
  92                 : idx) < c->sb.nr_devices &&
  93                !(ca = rcu_dereference_check(c->devs[idx],
  94                                             lockdep_is_held(&c->state_lock))))
  95                 idx++;
  96
  97         return ca;
  98 }
  99
 100 static inline struct bch_dev *__bch2_next_dev(struct bch_fs *c, struct bch_dev *ca,
 101                                               const struct bch_devs_mask *mask)
 102 {
 103         return __bch2_next_dev_idx(c, ca ? ca->dev_idx + 1 : 0, mask);
 104 }
 105
 106 #define for_each_member_device_rcu(_c, _ca, _mask)                      \
 107         for (struct bch_dev *_ca = NULL;                                \
 108              (_ca = __bch2_next_dev((_c), _ca, (_mask)));)
 109
 110 static inline struct bch_dev *bch2_get_next_dev(struct bch_fs *c, struct bch_dev *ca)
 111 {
 112         if (ca)
 113                 percpu_ref_put(&ca->ref);
 114
 115         rcu_read_lock();
 116         if ((ca = __bch2_next_dev(c, ca, NULL)))
 117                 percpu_ref_get(&ca->ref);
 118         rcu_read_unlock();
 119
 120         return ca;
 121 }
 122
 123 /*
 124  * If you break early, you must drop your ref on the current device
 125  */
 126 #define __for_each_member_device(_c, _ca)                               \
 127         for (;  (_ca = bch2_get_next_dev(_c, _ca));)
 128
 129 #define for_each_member_device(_c, _ca)                                 \
 130         for (struct bch_dev *_ca = NULL;                                \
 131              (_ca = bch2_get_next_dev(_c, _ca));)
 132
 133 static inline struct bch_dev *bch2_get_next_online_dev(struct bch_fs *c,
 134                                                        struct bch_dev *ca,
 135                                                        unsigned state_mask)
 136 {
 137         if (ca)
 138                 percpu_ref_put(&ca->io_ref);
 139
 140         rcu_read_lock();
 141         while ((ca = __bch2_next_dev(c, ca, NULL)) &&
 142                (!((1 << ca->mi.state) & state_mask) ||
 143                 !percpu_ref_tryget(&ca->io_ref)))
 144                 ;
 145         rcu_read_unlock();
 146
 147         return ca;
 148 }
 149
 150 #define __for_each_online_member(_c, _ca, state_mask)                   \
 151         for (struct bch_dev *_ca = NULL;                                \
 152              (_ca = bch2_get_next_online_dev(_c, _ca, state_mask));)
 153
 154 #define for_each_online_member(c, ca)                                   \
 155         __for_each_online_member(c, ca, ~0)
 156
 157 #define for_each_rw_member(c, ca)                                       \
 158         __for_each_online_member(c, ca, BIT(BCH_MEMBER_STATE_rw))
 159
 160 #define for_each_readable_member(c, ca)                         \
 161         __for_each_online_member(c, ca, BIT( BCH_MEMBER_STATE_rw)|BIT(BCH_MEMBER_STATE_ro))
 162
 163 /*
 164  * If a key exists that references a device, the device won't be going away and
 165  * we can omit rcu_read_lock():
 166  */
 167 static inline struct bch_dev *bch_dev_bkey_exists(const struct bch_fs *c, unsigned idx)
 168 {
 169         EBUG_ON(idx >= c->sb.nr_devices || !c->devs[idx]);
 170
 171         return rcu_dereference_check(c->devs[idx], 1);
 172 }
 173
 174 static inline struct bch_dev *bch_dev_locked(struct bch_fs *c, unsigned idx)
 175 {
 176         EBUG_ON(idx >= c->sb.nr_devices || !c->devs[idx]);
 177
 178         return rcu_dereference_protected(c->devs[idx],
 179                                          lockdep_is_held(&c->sb_lock) ||
 180                                          lockdep_is_held(&c->state_lock));
 181 }
 182
 183 /* XXX kill, move to struct bch_fs */
 184 static inline struct bch_devs_mask bch2_online_devs(struct bch_fs *c)
 185 {
 186         struct bch_devs_mask devs;
 187
 188         memset(&devs, 0, sizeof(devs));
 189         for_each_online_member(c, ca)
 190                 __set_bit(ca->dev_idx, devs.d);
 191         return devs;
 192 }
 193
 194 extern const struct bch_sb_field_ops bch_sb_field_ops_members_v1;
 195 extern const struct bch_sb_field_ops bch_sb_field_ops_members_v2;
 196
 197 static inline bool bch2_member_exists(struct bch_member *m)
 198 {
 199         return !bch2_is_zero(&m->uuid, sizeof(m->uuid));
 200 }
 201
 202 static inline bool bch2_dev_exists(struct bch_sb *sb, unsigned dev)
 203 {
 204         if (dev < sb->nr_devices) {
 205                 struct bch_member m = bch2_sb_member_get(sb, dev);
 206                 return bch2_member_exists(&m);
 207         }
 208         return false;
 209 }
 210
 211 static inline struct bch_member_cpu bch2_mi_to_cpu(struct bch_member *mi)
 212 {
 213         return (struct bch_member_cpu) {
 214                 .nbuckets       = le64_to_cpu(mi->nbuckets),
 215                 .first_bucket   = le16_to_cpu(mi->first_bucket),
 216                 .bucket_size    = le16_to_cpu(mi->bucket_size),
 217                 .group          = BCH_MEMBER_GROUP(mi),
 218                 .state          = BCH_MEMBER_STATE(mi),
 219                 .discard        = BCH_MEMBER_DISCARD(mi),
 220                 .data_allowed   = BCH_MEMBER_DATA_ALLOWED(mi),
 221                 .durability     = BCH_MEMBER_DURABILITY(mi)
 222                         ? BCH_MEMBER_DURABILITY(mi) - 1
 223                         : 1,
 224                 .freespace_initialized = BCH_MEMBER_FREESPACE_INITIALIZED(mi),
 225                 .valid          = bch2_member_exists(mi),
 226         };
 227 }
 228
 229 void bch2_sb_members_from_cpu(struct bch_fs *);
 230
 231 void bch2_dev_io_errors_to_text(struct printbuf *, struct bch_dev *);
 232 void bch2_dev_errors_reset(struct bch_dev *);
 233
 234 #endif /* _BCACHEFS_SB_MEMBERS_H */