1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _BCACHEFS_SB_MEMBERS_H
3 #define _BCACHEFS_SB_MEMBERS_H
7 extern char * const bch2_member_error_strs[];
9 static inline struct bch_member *
10 __bch2_members_v2_get_mut(struct bch_sb_field_members_v2 *mi, unsigned i)
12 return (void *) mi->_members + (i * le16_to_cpu(mi->member_bytes));
15 int bch2_sb_members_v2_init(struct bch_fs *c);
16 int bch2_sb_members_cpy_v2_v1(struct bch_sb_handle *disk_sb);
17 struct bch_member *bch2_members_v2_get_mut(struct bch_sb *sb, int i);
18 struct bch_member bch2_sb_member_get(struct bch_sb *sb, int i);
20 static inline bool bch2_dev_is_online(struct bch_dev *ca)
22 return !percpu_ref_is_zero(&ca->io_ref);
25 static inline bool bch2_dev_is_readable(struct bch_dev *ca)
27 return bch2_dev_is_online(ca) &&
28 ca->mi.state != BCH_MEMBER_STATE_failed;
31 static inline bool bch2_dev_get_ioref(struct bch_dev *ca, int rw)
33 if (!percpu_ref_tryget(&ca->io_ref))
36 if (ca->mi.state == BCH_MEMBER_STATE_rw ||
37 (ca->mi.state == BCH_MEMBER_STATE_ro && rw == READ))
40 percpu_ref_put(&ca->io_ref);
44 static inline unsigned dev_mask_nr(const struct bch_devs_mask *devs)
46 return bitmap_weight(devs->d, BCH_SB_MEMBERS_MAX);
49 static inline bool bch2_dev_list_has_dev(struct bch_devs_list devs,
52 darray_for_each(devs, i)
58 static inline void bch2_dev_list_drop_dev(struct bch_devs_list *devs,
61 darray_for_each(*devs, i)
63 darray_remove_item(devs, i);
68 static inline void bch2_dev_list_add_dev(struct bch_devs_list *devs,
71 if (!bch2_dev_list_has_dev(*devs, dev)) {
72 BUG_ON(devs->nr >= ARRAY_SIZE(devs->data));
73 devs->data[devs->nr++] = dev;
77 static inline struct bch_devs_list bch2_dev_list_single(unsigned dev)
79 return (struct bch_devs_list) { .nr = 1, .data[0] = dev };
82 static inline struct bch_dev *__bch2_next_dev_idx(struct bch_fs *c, unsigned idx,
83 const struct bch_devs_mask *mask)
85 struct bch_dev *ca = NULL;
88 ? find_next_bit(mask->d, c->sb.nr_devices, idx)
89 : idx) < c->sb.nr_devices &&
90 !(ca = rcu_dereference_check(c->devs[idx],
91 lockdep_is_held(&c->state_lock))))
97 static inline struct bch_dev *__bch2_next_dev(struct bch_fs *c, struct bch_dev *ca,
98 const struct bch_devs_mask *mask)
100 return __bch2_next_dev_idx(c, ca ? ca->dev_idx + 1 : 0, mask);
103 #define for_each_member_device_rcu(_c, _ca, _mask) \
104 for (struct bch_dev *_ca = NULL; \
105 (_ca = __bch2_next_dev((_c), _ca, (_mask)));)
107 static inline struct bch_dev *bch2_get_next_dev(struct bch_fs *c, struct bch_dev *ca)
110 percpu_ref_put(&ca->ref);
113 if ((ca = __bch2_next_dev(c, ca, NULL)))
114 percpu_ref_get(&ca->ref);
121 * If you break early, you must drop your ref on the current device
123 #define __for_each_member_device(_c, _ca) \
124 for (; (_ca = bch2_get_next_dev(_c, _ca));)
126 #define for_each_member_device(_c, _ca) \
127 for (struct bch_dev *_ca = NULL; \
128 (_ca = bch2_get_next_dev(_c, _ca));)
130 static inline struct bch_dev *bch2_get_next_online_dev(struct bch_fs *c,
135 percpu_ref_put(&ca->io_ref);
138 while ((ca = __bch2_next_dev(c, ca, NULL)) &&
139 (!((1 << ca->mi.state) & state_mask) ||
140 !percpu_ref_tryget(&ca->io_ref)))
147 #define __for_each_online_member(_c, _ca, state_mask) \
148 for (struct bch_dev *_ca = NULL; \
149 (_ca = bch2_get_next_online_dev(_c, _ca, state_mask));)
151 #define for_each_online_member(c, ca) \
152 __for_each_online_member(c, ca, ~0)
154 #define for_each_rw_member(c, ca) \
155 __for_each_online_member(c, ca, BIT(BCH_MEMBER_STATE_rw))
157 #define for_each_readable_member(c, ca) \
158 __for_each_online_member(c, ca, BIT( BCH_MEMBER_STATE_rw)|BIT(BCH_MEMBER_STATE_ro))
161 * If a key exists that references a device, the device won't be going away and
162 * we can omit rcu_read_lock():
164 static inline struct bch_dev *bch_dev_bkey_exists(const struct bch_fs *c, unsigned idx)
166 EBUG_ON(idx >= c->sb.nr_devices || !c->devs[idx]);
168 return rcu_dereference_check(c->devs[idx], 1);
171 static inline struct bch_dev *bch_dev_locked(struct bch_fs *c, unsigned idx)
173 EBUG_ON(idx >= c->sb.nr_devices || !c->devs[idx]);
175 return rcu_dereference_protected(c->devs[idx],
176 lockdep_is_held(&c->sb_lock) ||
177 lockdep_is_held(&c->state_lock));
180 /* XXX kill, move to struct bch_fs */
181 static inline struct bch_devs_mask bch2_online_devs(struct bch_fs *c)
183 struct bch_devs_mask devs;
185 memset(&devs, 0, sizeof(devs));
186 for_each_online_member(c, ca)
187 __set_bit(ca->dev_idx, devs.d);
191 extern const struct bch_sb_field_ops bch_sb_field_ops_members_v1;
192 extern const struct bch_sb_field_ops bch_sb_field_ops_members_v2;
194 static inline bool bch2_member_exists(struct bch_member *m)
196 return !bch2_is_zero(&m->uuid, sizeof(m->uuid));
199 static inline bool bch2_dev_exists(struct bch_sb *sb, unsigned dev)
201 if (dev < sb->nr_devices) {
202 struct bch_member m = bch2_sb_member_get(sb, dev);
203 return bch2_member_exists(&m);
208 static inline struct bch_member_cpu bch2_mi_to_cpu(struct bch_member *mi)
210 return (struct bch_member_cpu) {
211 .nbuckets = le64_to_cpu(mi->nbuckets),
212 .first_bucket = le16_to_cpu(mi->first_bucket),
213 .bucket_size = le16_to_cpu(mi->bucket_size),
214 .group = BCH_MEMBER_GROUP(mi),
215 .state = BCH_MEMBER_STATE(mi),
216 .discard = BCH_MEMBER_DISCARD(mi),
217 .data_allowed = BCH_MEMBER_DATA_ALLOWED(mi),
218 .durability = BCH_MEMBER_DURABILITY(mi)
219 ? BCH_MEMBER_DURABILITY(mi) - 1
221 .freespace_initialized = BCH_MEMBER_FREESPACE_INITIALIZED(mi),
222 .valid = bch2_member_exists(mi),
226 void bch2_sb_members_from_cpu(struct bch_fs *);
228 void bch2_dev_io_errors_to_text(struct printbuf *, struct bch_dev *);
229 void bch2_dev_errors_reset(struct bch_dev *);
231 #endif /* _BCACHEFS_SB_MEMBERS_H */