will add sys_getublimit().Add the following system calls for UB management:
1. sys_getluid - get current UB id
2. sys_setluid - changes exec_ and fork_ UBs on current
3. sys_setublimit - set limits for resources consumtions
Why not have another system call for getting the current limits?
But as I said in previous mail, configfs seems like a better choice forCheck another email about interfaces. I have arguments against it :/
user interface. That way user has to go to one place to read/write
limits, see the current usage and other stats.
any idea what exact action to add here?Signed-Off-By: Pavel Emelianov <xemul@xxxxx>
Signed-Off-By: Kirill Korotaev <dev@xxxxx>
...<snip>...
+
+/*
+ * The setbeanlimit syscall
+ */
+asmlinkage long sys_setublimit(uid_t uid, unsigned long resource,
+ unsigned long *limits)
+{
+ ub = beancounter_findcreate(uid, NULL, 0);
+ if (ub == NULL)
+ goto out;
+
+ spin_lock_irqsave(&ub->ub_lock, flags);
+ ub->ub_parms[resource].barrier = new_limits[0];
+ ub->ub_parms[resource].limit = new_limits[1];
+ spin_unlock_irqrestore(&ub->ub_lock, flags);
+
I think there should be a check here for seeing if the new limits are
lower than the current usage of a resource. If so then take appropriate
action.