On 10/2/20 4:34 PM, Shuah Khan wrote: > All, > > I came across these atomic_inc_return_safe() & atomic_dec_return_safe() > functions that hold the counters at safe values. > > atomic_inc_return_safe() > > If the counter is already 0 it will not be incremented. > If the counter is already at its maximum value returns > -EINVAL without updating it. > > atomic_dec_return_safe() > > Decrement the counter. Return the resulting value, or -EINVAL > > These two routines are static and only used in rbd.c. > > Can these become part of atomic_t ops?
I think you just want to use refcount_t for this use case. They have safe guards for under/overflow. -- Jens Axboe
