Re: [net-next PATCH v5 2/3] sysctl: add proc_do_large_bitmap

["Octavian Purdila" <opurdila@ixiacom.com>]

>
> My test shows it still accepts spaces, e.g.
>
> echo '50000 50003 50005' > ip_local_reserved_ports
>
> works same as
>
> echo '50000,50003,50005' > ip_local_reserved_ports
>
> Is this expected? We will only accept commas, right?
>

Thanks for testing, I didn't saw that comming! I wanted to allow whitespaces in between the commas but it looks like I got overzealous. I can easily fix that. 

But I think its worth to keep the whitespaces in beetween, e.g. allow

$ echo '1, 2 ,3 ' >   ip_local_reserved_ports.

>
> Also, if I write an invalid value, it does reject this, but the previous
> value in that file is cleared, shouldn't we keep the previous one?
>
>

The only way I see to fix this is to return EINVAL if we detect a write with offset.

IMO we should do that for the other proc write routines as well, as otherwise ther result is confusing, e.g.

write("1 2"); write(" 3");

will set first value in the vector to 1, than second value to 2 then *first* value to 3.

I am all for it, but again, this changes userspace ABI.