Paul Menage wrote:
> On 7/20/07, Balbir Singh <[email protected]> wrote:
>> +
>> +ssize_t res_counter_read(struct res_counter *counter, int member,
>> + const char __user *userbuf, size_t nbytes, loff_t *pos)
>> +{
>> + unsigned long *val;
>> + char buf[64], *s;
>> +
>> + s = buf;
>> + val = res_counter_member(counter, member);
>> + s += sprintf(s, "%lu\n", *val);
>> + return simple_read_from_buffer((void __user *)userbuf, nbytes,
>> + pos, buf, s - buf);
>> +}
>
> I think it should be possible to use the support built-in to task
> containers to export a uint64 rather than having to create a separate
> function here.
>
That sounds like an easy thing to do, but that means we need to standardize
on the uint64 data type for all platforms.
>> +
>> +ssize_t res_counter_write(struct res_counter *counter, int member,
>> + const char __user *userbuf, size_t nbytes, loff_t *pos)
>> +{
>> + int ret;
>> + char *buf, *end;
>> + unsigned long tmp, *val;
>> +
>> + buf = kmalloc(nbytes + 1, GFP_KERNEL);
>> + ret = -ENOMEM;
>> + if (buf == NULL)
>> + goto out;
>> +
>> + buf[nbytes] = '\0';
>> + ret = -EFAULT;
>> + if (copy_from_user(buf, userbuf, nbytes))
>> + goto out_free;
>> +
>> + ret = -EINVAL;
>> + tmp = simple_strtoul(buf, &end, 10);
>> + if (*end != '\0')
>> + goto out_free;
>> +
>> + val = res_counter_member(counter, member);
>> + *val = tmp;
>> + ret = nbytes;
>> +out_free:
>> + kfree(buf);
>> +out:
>> + return ret;
>> +}
>
> I should probably add a generic "write uint64" wraper to task
> containers as well.
>
Sounds good, that will be really helpful.
> Paul
>
> --
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--
Warm Regards,
Balbir Singh
Linux Technology Center
IBM, ISTL
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