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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _BCACHEFS_SB_MEMBERS_H
#define _BCACHEFS_SB_MEMBERS_H
struct bch_member bch2_sb_member_get(struct bch_sb *sb, int i);
static inline bool bch2_dev_is_online(struct bch_dev *ca)
{
return !percpu_ref_is_zero(&ca->io_ref);
}
static inline bool bch2_dev_is_readable(struct bch_dev *ca)
{
return bch2_dev_is_online(ca) &&
ca->mi.state != BCH_MEMBER_STATE_failed;
}
static inline bool bch2_dev_get_ioref(struct bch_dev *ca, int rw)
{
if (!percpu_ref_tryget(&ca->io_ref))
return false;
if (ca->mi.state == BCH_MEMBER_STATE_rw ||
(ca->mi.state == BCH_MEMBER_STATE_ro && rw == READ))
return true;
percpu_ref_put(&ca->io_ref);
return false;
}
static inline unsigned dev_mask_nr(const struct bch_devs_mask *devs)
{
return bitmap_weight(devs->d, BCH_SB_MEMBERS_MAX);
}
static inline bool bch2_dev_list_has_dev(struct bch_devs_list devs,
unsigned dev)
{
unsigned i;
for (i = 0; i < devs.nr; i++)
if (devs.devs[i] == dev)
return true;
return false;
}
static inline void bch2_dev_list_drop_dev(struct bch_devs_list *devs,
unsigned dev)
{
unsigned i;
for (i = 0; i < devs->nr; i++)
if (devs->devs[i] == dev) {
array_remove_item(devs->devs, devs->nr, i);
return;
}
}
static inline void bch2_dev_list_add_dev(struct bch_devs_list *devs,
unsigned dev)
{
if (!bch2_dev_list_has_dev(*devs, dev)) {
BUG_ON(devs->nr >= ARRAY_SIZE(devs->devs));
devs->devs[devs->nr++] = dev;
}
}
static inline struct bch_devs_list bch2_dev_list_single(unsigned dev)
{
return (struct bch_devs_list) { .nr = 1, .devs[0] = dev };
}
static inline struct bch_dev *__bch2_next_dev(struct bch_fs *c, unsigned *iter,
const struct bch_devs_mask *mask)
{
struct bch_dev *ca = NULL;
while ((*iter = mask
? find_next_bit(mask->d, c->sb.nr_devices, *iter)
: *iter) < c->sb.nr_devices &&
!(ca = rcu_dereference_check(c->devs[*iter],
lockdep_is_held(&c->state_lock))))
(*iter)++;
return ca;
}
#define for_each_member_device_rcu(ca, c, iter, mask) \
for ((iter) = 0; ((ca) = __bch2_next_dev((c), &(iter), mask)); (iter)++)
static inline struct bch_dev *bch2_get_next_dev(struct bch_fs *c, unsigned *iter)
{
struct bch_dev *ca;
rcu_read_lock();
if ((ca = __bch2_next_dev(c, iter, NULL)))
percpu_ref_get(&ca->ref);
rcu_read_unlock();
return ca;
}
/*
* If you break early, you must drop your ref on the current device
*/
#define for_each_member_device(ca, c, iter) \
for ((iter) = 0; \
(ca = bch2_get_next_dev(c, &(iter))); \
percpu_ref_put(&ca->ref), (iter)++)
static inline struct bch_dev *bch2_get_next_online_dev(struct bch_fs *c,
unsigned *iter,
int state_mask)
{
struct bch_dev *ca;
rcu_read_lock();
while ((ca = __bch2_next_dev(c, iter, NULL)) &&
(!((1 << ca->mi.state) & state_mask) ||
!percpu_ref_tryget(&ca->io_ref)))
(*iter)++;
rcu_read_unlock();
return ca;
}
#define __for_each_online_member(ca, c, iter, state_mask) \
for ((iter) = 0; \
(ca = bch2_get_next_online_dev(c, &(iter), state_mask)); \
percpu_ref_put(&ca->io_ref), (iter)++)
#define for_each_online_member(ca, c, iter) \
__for_each_online_member(ca, c, iter, ~0)
#define for_each_rw_member(ca, c, iter) \
__for_each_online_member(ca, c, iter, 1 << BCH_MEMBER_STATE_rw)
#define for_each_readable_member(ca, c, iter) \
__for_each_online_member(ca, c, iter, \
(1 << BCH_MEMBER_STATE_rw)|(1 << BCH_MEMBER_STATE_ro))
/*
* If a key exists that references a device, the device won't be going away and
* we can omit rcu_read_lock():
*/
static inline struct bch_dev *bch_dev_bkey_exists(const struct bch_fs *c, unsigned idx)
{
EBUG_ON(idx >= c->sb.nr_devices || !c->devs[idx]);
return rcu_dereference_check(c->devs[idx], 1);
}
static inline struct bch_dev *bch_dev_locked(struct bch_fs *c, unsigned idx)
{
EBUG_ON(idx >= c->sb.nr_devices || !c->devs[idx]);
return rcu_dereference_protected(c->devs[idx],
lockdep_is_held(&c->sb_lock) ||
lockdep_is_held(&c->state_lock));
}
/* XXX kill, move to struct bch_fs */
static inline struct bch_devs_mask bch2_online_devs(struct bch_fs *c)
{
struct bch_devs_mask devs;
struct bch_dev *ca;
unsigned i;
memset(&devs, 0, sizeof(devs));
for_each_online_member(ca, c, i)
__set_bit(ca->dev_idx, devs.d);
return devs;
}
extern const struct bch_sb_field_ops bch_sb_field_ops_members;
#endif /* _BCACHEFS_SB_MEMBERS_H */
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