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bcachefs: Add an assert to bch2_bucket_nocow_unlock()

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Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Kent Overstreet 2023-01-26 13:36:30 -05:00
parent 3482dd6a25
commit 01efebd8f1
1 changed files with 4 additions and 0 deletions
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4
fs/bcachefs/nocow_locking.c
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@ -18,6 +18,8 @@ bool bch2_bucket_nocow_is_locked(struct bucket_nocow_lock_table *t, struct bpos
return false;
}
#define sign(v) (v < 0 ? -1 : v > 0 ? 1 : 0)
void bch2_bucket_nocow_unlock(struct bucket_nocow_lock_table *t, struct bpos bucket, int flags)
{
u64 dev_bucket = bucket_to_u64(bucket);
@ -27,6 +29,8 @@ void bch2_bucket_nocow_unlock(struct bucket_nocow_lock_table *t, struct bpos buc
for (i = 0; i < ARRAY_SIZE(l->b); i++)
if (l->b[i] == dev_bucket) {
BUG_ON(sign(atomic_read(&l->l[i])) != lock_val);
if (!atomic_sub_return(lock_val, &l->l[i]))
closure_wake_up(&l->wait);
return;