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

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _BCACHEFS_SUPER_H
   3 #define _BCACHEFS_SUPER_H
   4
   5 #include "extents.h"
   6
   7 #include "bcachefs_ioctl.h"
   8
   9 #include <linux/math64.h>
  10
  11 static inline size_t sector_to_bucket(const struct bch_dev *ca, sector_t s)
  12 {
  13         return div_u64(s, ca->mi.bucket_size);
  14 }
  15
  16 static inline sector_t bucket_to_sector(const struct bch_dev *ca, size_t b)
  17 {
  18         return ((sector_t) b) * ca->mi.bucket_size;
  19 }
  20
  21 static inline sector_t bucket_remainder(const struct bch_dev *ca, sector_t s)
  22 {
  23         u32 remainder;
  24
  25         div_u64_rem(s, ca->mi.bucket_size, &remainder);
  26         return remainder;
  27 }
  28
  29 static inline size_t sector_to_bucket_and_offset(const struct bch_dev *ca, sector_t s,
  30                                                  u32 *offset)
  31 {
  32         return div_u64_rem(s, ca->mi.bucket_size, offset);
  33 }
  34
  35 static inline bool bch2_dev_is_online(struct bch_dev *ca)
  36 {
  37         return !percpu_ref_is_zero(&ca->io_ref);
  38 }
  39
  40 static inline bool bch2_dev_is_readable(struct bch_dev *ca)
  41 {
  42         return bch2_dev_is_online(ca) &&
  43                 ca->mi.state != BCH_MEMBER_STATE_failed;
  44 }
  45
  46 static inline bool bch2_dev_get_ioref(struct bch_dev *ca, int rw)
  47 {
  48         if (!percpu_ref_tryget(&ca->io_ref))
  49                 return false;
  50
  51         if (ca->mi.state == BCH_MEMBER_STATE_rw ||
  52             (ca->mi.state == BCH_MEMBER_STATE_ro && rw == READ))
  53                 return true;
  54
  55         percpu_ref_put(&ca->io_ref);
  56         return false;
  57 }
  58
  59 static inline unsigned dev_mask_nr(const struct bch_devs_mask *devs)
  60 {
  61         return bitmap_weight(devs->d, BCH_SB_MEMBERS_MAX);
  62 }
  63
  64 static inline bool bch2_dev_list_has_dev(struct bch_devs_list devs,
  65                                          unsigned dev)
  66 {
  67         unsigned i;
  68
  69         for (i = 0; i < devs.nr; i++)
  70                 if (devs.devs[i] == dev)
  71                         return true;
  72
  73         return false;
  74 }
  75
  76 static inline void bch2_dev_list_drop_dev(struct bch_devs_list *devs,
  77                                           unsigned dev)
  78 {
  79         unsigned i;
  80
  81         for (i = 0; i < devs->nr; i++)
  82                 if (devs->devs[i] == dev) {
  83                         array_remove_item(devs->devs, devs->nr, i);
  84                         return;
  85                 }
  86 }
  87
  88 static inline void bch2_dev_list_add_dev(struct bch_devs_list *devs,
  89                                          unsigned dev)
  90 {
  91         if (!bch2_dev_list_has_dev(*devs, dev)) {
  92                 BUG_ON(devs->nr >= ARRAY_SIZE(devs->devs));
  93                 devs->devs[devs->nr++] = dev;
  94         }
  95 }
  96
  97 static inline struct bch_devs_list bch2_dev_list_single(unsigned dev)
  98 {
  99         return (struct bch_devs_list) { .nr = 1, .devs[0] = dev };
 100 }
 101
 102 static inline struct bch_dev *__bch2_next_dev(struct bch_fs *c, unsigned *iter,
 103                                               const struct bch_devs_mask *mask)
 104 {
 105         struct bch_dev *ca = NULL;
 106
 107         while ((*iter = mask
 108                 ? find_next_bit(mask->d, c->sb.nr_devices, *iter)
 109                 : *iter) < c->sb.nr_devices &&
 110                !(ca = rcu_dereference_check(c->devs[*iter],
 111                                             lockdep_is_held(&c->state_lock))))
 112                 (*iter)++;
 113
 114         return ca;
 115 }
 116
 117 #define for_each_member_device_rcu(ca, c, iter, mask)                   \
 118         for ((iter) = 0; ((ca) = __bch2_next_dev((c), &(iter), mask)); (iter)++)
 119
 120 static inline struct bch_dev *bch2_get_next_dev(struct bch_fs *c, unsigned *iter)
 121 {
 122         struct bch_dev *ca;
 123
 124         rcu_read_lock();
 125         if ((ca = __bch2_next_dev(c, iter, NULL)))
 126                 percpu_ref_get(&ca->ref);
 127         rcu_read_unlock();
 128
 129         return ca;
 130 }
 131
 132 /*
 133  * If you break early, you must drop your ref on the current device
 134  */
 135 #define for_each_member_device(ca, c, iter)                             \
 136         for ((iter) = 0;                                                \
 137              (ca = bch2_get_next_dev(c, &(iter)));                      \
 138              percpu_ref_put(&ca->ref), (iter)++)
 139
 140 static inline struct bch_dev *bch2_get_next_online_dev(struct bch_fs *c,
 141                                                       unsigned *iter,
 142                                                       int state_mask)
 143 {
 144         struct bch_dev *ca;
 145
 146         rcu_read_lock();
 147         while ((ca = __bch2_next_dev(c, iter, NULL)) &&
 148                (!((1 << ca->mi.state) & state_mask) ||
 149                 !percpu_ref_tryget(&ca->io_ref)))
 150                 (*iter)++;
 151         rcu_read_unlock();
 152
 153         return ca;
 154 }
 155
 156 #define __for_each_online_member(ca, c, iter, state_mask)               \
 157         for ((iter) = 0;                                                \
 158              (ca = bch2_get_next_online_dev(c, &(iter), state_mask));   \
 159              percpu_ref_put(&ca->io_ref), (iter)++)
 160
 161 #define for_each_online_member(ca, c, iter)                             \
 162         __for_each_online_member(ca, c, iter, ~0)
 163
 164 #define for_each_rw_member(ca, c, iter)                                 \
 165         __for_each_online_member(ca, c, iter, 1 << BCH_MEMBER_STATE_rw)
 166
 167 #define for_each_readable_member(ca, c, iter)                           \
 168         __for_each_online_member(ca, c, iter,                           \
 169                 (1 << BCH_MEMBER_STATE_rw)|(1 << BCH_MEMBER_STATE_ro))
 170
 171 /*
 172  * If a key exists that references a device, the device won't be going away and
 173  * we can omit rcu_read_lock():
 174  */
 175 static inline struct bch_dev *bch_dev_bkey_exists(const struct bch_fs *c, unsigned idx)
 176 {
 177         EBUG_ON(idx >= c->sb.nr_devices || !c->devs[idx]);
 178
 179         return rcu_dereference_check(c->devs[idx], 1);
 180 }
 181
 182 static inline struct bch_dev *bch_dev_locked(struct bch_fs *c, unsigned idx)
 183 {
 184         EBUG_ON(idx >= c->sb.nr_devices || !c->devs[idx]);
 185
 186         return rcu_dereference_protected(c->devs[idx],
 187                                          lockdep_is_held(&c->sb_lock) ||
 188                                          lockdep_is_held(&c->state_lock));
 189 }
 190
 191 /* XXX kill, move to struct bch_fs */
 192 static inline struct bch_devs_mask bch2_online_devs(struct bch_fs *c)
 193 {
 194         struct bch_devs_mask devs;
 195         struct bch_dev *ca;
 196         unsigned i;
 197
 198         memset(&devs, 0, sizeof(devs));
 199         for_each_online_member(ca, c, i)
 200                 __set_bit(ca->dev_idx, devs.d);
 201         return devs;
 202 }
 203
 204 static inline bool is_superblock_bucket(struct bch_dev *ca, u64 b)
 205 {
 206         struct bch_sb_layout *layout = &ca->disk_sb.sb->layout;
 207         u64 b_offset    = bucket_to_sector(ca, b);
 208         u64 b_end       = bucket_to_sector(ca, b + 1);
 209         unsigned i;
 210
 211         if (!b)
 212                 return true;
 213
 214         for (i = 0; i < layout->nr_superblocks; i++) {
 215                 u64 offset = le64_to_cpu(layout->sb_offset[i]);
 216                 u64 end = offset + (1 << layout->sb_max_size_bits);
 217
 218                 if (!(offset >= b_end || end <= b_offset))
 219                         return true;
 220         }
 221
 222         return false;
 223 }
 224
 225 struct bch_fs *bch2_dev_to_fs(dev_t);
 226 struct bch_fs *bch2_uuid_to_fs(__uuid_t);
 227
 228 bool bch2_dev_state_allowed(struct bch_fs *, struct bch_dev *,
 229                            enum bch_member_state, int);
 230 int __bch2_dev_set_state(struct bch_fs *, struct bch_dev *,
 231                         enum bch_member_state, int);
 232 int bch2_dev_set_state(struct bch_fs *, struct bch_dev *,
 233                       enum bch_member_state, int);
 234
 235 int bch2_dev_fail(struct bch_dev *, int);
 236 int bch2_dev_remove(struct bch_fs *, struct bch_dev *, int);
 237 int bch2_dev_add(struct bch_fs *, const char *);
 238 int bch2_dev_online(struct bch_fs *, const char *);
 239 int bch2_dev_offline(struct bch_fs *, struct bch_dev *, int);
 240 int bch2_dev_resize(struct bch_fs *, struct bch_dev *, u64);
 241 struct bch_dev *bch2_dev_lookup(struct bch_fs *, const char *);
 242
 243 bool bch2_fs_emergency_read_only(struct bch_fs *);
 244 void bch2_fs_read_only(struct bch_fs *);
 245
 246 int bch2_fs_read_write(struct bch_fs *);
 247 int bch2_fs_read_write_early(struct bch_fs *);
 248
 249 /*
 250  * Only for use in the recovery/fsck path:
 251  */
 252 static inline void bch2_fs_lazy_rw(struct bch_fs *c)
 253 {
 254         if (!test_bit(BCH_FS_RW, &c->flags) &&
 255             !test_bit(BCH_FS_WAS_RW, &c->flags))
 256                 bch2_fs_read_write_early(c);
 257 }
 258
 259 void __bch2_fs_stop(struct bch_fs *);
 260 void bch2_fs_free(struct bch_fs *);
 261 void bch2_fs_stop(struct bch_fs *);
 262
 263 int bch2_fs_start(struct bch_fs *);
 264 struct bch_fs *bch2_fs_open(char * const *, unsigned, struct bch_opts);
 265
 266 #endif /* _BCACHEFS_SUPER_H */