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bcachefs: Reduce the scope of gc_lock

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gc_lock is now only for synchronization between check_alloc_info and
interior btree updates - nothing else

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Kent Overstreet 2024-06-13 17:07:36 -04:00
parent 132e1a2380
commit b0d3ab531f
6 changed files with 12 additions and 12 deletions
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3
fs/bcachefs/alloc_background.c
View File

@ -596,8 +596,6 @@ int bch2_alloc_read(struct bch_fs *c)
struct bch_dev *ca = NULL;
int ret;
down_read(&c->gc_lock);
if (c->sb.version_upgrade_complete >= bcachefs_metadata_version_bucket_gens) {
ret = for_each_btree_key(trans, iter, BTREE_ID_bucket_gens, POS_MIN,
BTREE_ITER_prefetch, k, ({
@ -646,7 +644,6 @@ int bch2_alloc_read(struct bch_fs *c)
bch2_dev_put(ca);
bch2_trans_put(trans);
up_read(&c->gc_lock);
bch_err_fn(c, ret);
return ret;

4
fs/bcachefs/bcachefs.h
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@ -538,8 +538,8 @@ struct bch_dev {
/*
* Buckets:
* Per-bucket arrays are protected by c->mark_lock, bucket_lock and
* gc_lock, for device resize - holding any is sufficient for access:
* Or rcu_read_lock(), but only for dev_ptr_stale():
* gc_gens_lock, for device resize - holding any is sufficient for
* access: Or rcu_read_lock(), but only for dev_ptr_stale():
*/
struct bucket_array __rcu *buckets_gc;
struct bucket_gens __rcu *bucket_gens;

7
fs/bcachefs/btree_gc.c
View File

@ -1240,7 +1240,7 @@ int bch2_gc_gens(struct bch_fs *c)
int ret;
/*
* Ideally we would be using state_lock and not gc_lock here, but that
* Ideally we would be using state_lock and not gc_gens_lock here, but that
* introduces a deadlock in the RO path - we currently take the state
* lock at the start of going RO, thus the gc thread may get stuck:
*/
@ -1248,7 +1248,8 @@ int bch2_gc_gens(struct bch_fs *c)
return 0;
trace_and_count(c, gc_gens_start, c);
down_read(&c->gc_lock);
down_read(&c->state_lock);
for_each_member_device(c, ca) {
struct bucket_gens *gens = bucket_gens(ca);
@ -1317,7 +1318,7 @@ err:
ca->oldest_gen = NULL;
}
up_read(&c->gc_lock);
up_read(&c->state_lock);
mutex_unlock(&c->gc_gens_lock);
if (!bch2_err_matches(ret, EROFS))
bch_err_fn(c, ret);

2
fs/bcachefs/buckets.c
View File

@ -1217,7 +1217,6 @@ int bch2_dev_buckets_resize(struct bch_fs *c, struct bch_dev *ca, u64 nbuckets)
bucket_gens->nbuckets - bucket_gens->first_bucket;
if (resize) {
down_write(&c->gc_lock);
down_write(&ca->bucket_lock);
percpu_down_write(&c->mark_lock);
}
@ -1240,7 +1239,6 @@ int bch2_dev_buckets_resize(struct bch_fs *c, struct bch_dev *ca, u64 nbuckets)
if (resize) {
percpu_up_write(&c->mark_lock);
up_write(&ca->bucket_lock);
up_write(&c->gc_lock);
}
ret = 0;

4
fs/bcachefs/buckets.h
View File

@ -85,7 +85,7 @@ static inline struct bucket_array *gc_bucket_array(struct bch_dev *ca)
return rcu_dereference_check(ca->buckets_gc,
!ca->fs ||
percpu_rwsem_is_held(&ca->fs->mark_lock) ||
lockdep_is_held(&ca->fs->gc_lock) ||
lockdep_is_held(&ca->fs->state_lock) ||
lockdep_is_held(&ca->bucket_lock));
}
@ -103,7 +103,7 @@ static inline struct bucket_gens *bucket_gens(struct bch_dev *ca)
return rcu_dereference_check(ca->bucket_gens,
!ca->fs ||
percpu_rwsem_is_held(&ca->fs->mark_lock) ||
lockdep_is_held(&ca->fs->gc_lock) ||
lockdep_is_held(&ca->fs->state_lock) ||
lockdep_is_held(&ca->bucket_lock));
}

4
fs/bcachefs/recovery_passes.c
View File

@ -193,6 +193,8 @@ int bch2_run_online_recovery_passes(struct bch_fs *c)
{
int ret = 0;
down_read(&c->state_lock);
for (unsigned i = 0; i < ARRAY_SIZE(recovery_pass_fns); i++) {
struct recovery_pass_fn *p = recovery_pass_fns + i;
@ -208,6 +210,8 @@ int bch2_run_online_recovery_passes(struct bch_fs *c)
break;
}
up_read(&c->state_lock);
return ret;
}