1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _BCACHEFS_SB_MEMBERS_H
3 #define _BCACHEFS_SB_MEMBERS_H
5 extern char * const bch2_member_error_strs[];
7 static inline struct bch_member *
8 __bch2_members_v2_get_mut(struct bch_sb_field_members_v2 *mi, unsigned i)
10 return (void *) mi->_members + (i * le16_to_cpu(mi->member_bytes));
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);
18 static inline bool bch2_dev_is_online(struct bch_dev *ca)
20 return !percpu_ref_is_zero(&ca->io_ref);
23 static inline bool bch2_dev_is_readable(struct bch_dev *ca)
25 return bch2_dev_is_online(ca) &&
26 ca->mi.state != BCH_MEMBER_STATE_failed;
29 static inline bool bch2_dev_get_ioref(struct bch_dev *ca, int rw)
31 if (!percpu_ref_tryget(&ca->io_ref))
34 if (ca->mi.state == BCH_MEMBER_STATE_rw ||
35 (ca->mi.state == BCH_MEMBER_STATE_ro && rw == READ))
38 percpu_ref_put(&ca->io_ref);
42 static inline unsigned dev_mask_nr(const struct bch_devs_mask *devs)
44 return bitmap_weight(devs->d, BCH_SB_MEMBERS_MAX);
47 static inline bool bch2_dev_list_has_dev(struct bch_devs_list devs,
52 for (i = 0; i < devs.nr; i++)
53 if (devs.devs[i] == dev)
59 static inline void bch2_dev_list_drop_dev(struct bch_devs_list *devs,
64 for (i = 0; i < devs->nr; i++)
65 if (devs->devs[i] == dev) {
66 array_remove_item(devs->devs, devs->nr, i);
71 static inline void bch2_dev_list_add_dev(struct bch_devs_list *devs,
74 if (!bch2_dev_list_has_dev(*devs, dev)) {
75 BUG_ON(devs->nr >= ARRAY_SIZE(devs->devs));
76 devs->devs[devs->nr++] = dev;
80 static inline struct bch_devs_list bch2_dev_list_single(unsigned dev)
82 return (struct bch_devs_list) { .nr = 1, .devs[0] = dev };
85 static inline struct bch_dev *__bch2_next_dev(struct bch_fs *c, unsigned *iter,
86 const struct bch_devs_mask *mask)
88 struct bch_dev *ca = NULL;
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))))
100 #define for_each_member_device_rcu(ca, c, iter, mask) \
101 for ((iter) = 0; ((ca) = __bch2_next_dev((c), &(iter), mask)); (iter)++)
103 static inline struct bch_dev *bch2_get_next_dev(struct bch_fs *c, unsigned *iter)
108 if ((ca = __bch2_next_dev(c, iter, NULL)))
109 percpu_ref_get(&ca->ref);
116 * If you break early, you must drop your ref on the current device
118 #define for_each_member_device(ca, c, iter) \
120 (ca = bch2_get_next_dev(c, &(iter))); \
121 percpu_ref_put(&ca->ref), (iter)++)
123 static inline struct bch_dev *bch2_get_next_online_dev(struct bch_fs *c,
130 while ((ca = __bch2_next_dev(c, iter, NULL)) &&
131 (!((1 << ca->mi.state) & state_mask) ||
132 !percpu_ref_tryget(&ca->io_ref)))
139 #define __for_each_online_member(ca, c, iter, state_mask) \
141 (ca = bch2_get_next_online_dev(c, &(iter), state_mask)); \
142 percpu_ref_put(&ca->io_ref), (iter)++)
144 #define for_each_online_member(ca, c, iter) \
145 __for_each_online_member(ca, c, iter, ~0)
147 #define for_each_rw_member(ca, c, iter) \
148 __for_each_online_member(ca, c, iter, 1 << BCH_MEMBER_STATE_rw)
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))
155 * If a key exists that references a device, the device won't be going away and
156 * we can omit rcu_read_lock():
158 static inline struct bch_dev *bch_dev_bkey_exists(const struct bch_fs *c, unsigned idx)
160 EBUG_ON(idx >= c->sb.nr_devices || !c->devs[idx]);
162 return rcu_dereference_check(c->devs[idx], 1);
165 static inline struct bch_dev *bch_dev_locked(struct bch_fs *c, unsigned idx)
167 EBUG_ON(idx >= c->sb.nr_devices || !c->devs[idx]);
169 return rcu_dereference_protected(c->devs[idx],
170 lockdep_is_held(&c->sb_lock) ||
171 lockdep_is_held(&c->state_lock));
174 /* XXX kill, move to struct bch_fs */
175 static inline struct bch_devs_mask bch2_online_devs(struct bch_fs *c)
177 struct bch_devs_mask devs;
181 memset(&devs, 0, sizeof(devs));
182 for_each_online_member(ca, c, i)
183 __set_bit(ca->dev_idx, devs.d);
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;
190 static inline bool bch2_member_exists(struct bch_member *m)
192 return !bch2_is_zero(&m->uuid, sizeof(m->uuid));
195 static inline bool bch2_dev_exists(struct bch_sb *sb, unsigned dev)
197 if (dev < sb->nr_devices) {
198 struct bch_member m = bch2_sb_member_get(sb, dev);
199 return bch2_member_exists(&m);
204 static inline struct bch_member_cpu bch2_mi_to_cpu(struct bch_member *mi)
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
217 .freespace_initialized = BCH_MEMBER_FREESPACE_INITIALIZED(mi),
218 .valid = bch2_member_exists(mi),
222 void bch2_sb_members_from_cpu(struct bch_fs *);
224 void bch2_dev_io_errors_to_text(struct printbuf *, struct bch_dev *);
225 void bch2_dev_errors_reset(struct bch_dev *);
227 #endif /* _BCACHEFS_SB_MEMBERS_H */