#include <linux/math64.h>
-static inline size_t sector_to_bucket(const struct bch_dev *ca, sector_t s)
-{
- return div_u64(s, ca->mi.bucket_size);
-}
-
-static inline sector_t bucket_to_sector(const struct bch_dev *ca, size_t b)
-{
- return ((sector_t) b) * ca->mi.bucket_size;
-}
-
-static inline sector_t bucket_remainder(const struct bch_dev *ca, sector_t s)
-{
- u32 remainder;
-
- div_u64_rem(s, ca->mi.bucket_size, &remainder);
- return remainder;
-}
-
-static inline size_t sector_to_bucket_and_offset(const struct bch_dev *ca, sector_t s,
- u32 *offset)
-{
- return div_u64_rem(s, ca->mi.bucket_size, offset);
-}
-
-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;
-}
-
-static inline bool is_superblock_bucket(struct bch_dev *ca, u64 b)
-{
- struct bch_sb_layout *layout = &ca->disk_sb.sb->layout;
- u64 b_offset = bucket_to_sector(ca, b);
- u64 b_end = bucket_to_sector(ca, b + 1);
- unsigned i;
-
- if (!b)
- return true;
-
- for (i = 0; i < layout->nr_superblocks; i++) {
- u64 offset = le64_to_cpu(layout->sb_offset[i]);
- u64 end = offset + (1 << layout->sb_max_size_bits);
-
- if (!(offset >= b_end || end <= b_offset))
- return true;
- }
-
- return false;
-}
-
struct bch_fs *bch2_dev_to_fs(dev_t);
struct bch_fs *bch2_uuid_to_fs(__uuid_t);
projects / bcachefs-tools-debian / blobdiff