vfs: fix up ENOIOCTLCMD error handling

We're doing some odd things there, which already messes up various users
(see the net/socket.c code that this removes), and it was going to add
yet more crud to the block layer because of the incorrect error code
translation.

ENOIOCTLCMD is not an error return that should be returned to user mode
from the "ioctl()" system call, but it should *not* be translated as
EINVAL ("Invalid argument").  It should be translated as ENOTTY
("Inappropriate ioctl for device").

That EINVAL confusion has apparently so permeated some code that the
block layer actually checks for it, which is sad.  We continue to do so
for now, but add a big comment about how wrong that is, and we should
remove it entirely eventually.  In the meantime, this tries to keep the
changes localized to just the EINVAL -> ENOTTY fix, and removing code
that makes it harder to do the right thing.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

net/socket.c

@@ -2883,7 +2883,7 @@ static int bond_ioctl(struct net *net, unsigned int cmd,
 
 		return dev_ioctl(net, cmd, uifr);
 	default:
-		return -EINVAL;
+		return -ENOIOCTLCMD;
 	}
 }
 
@@ -3210,20 +3210,6 @@ static int compat_sock_ioctl_trans(struct file *file, struct socket *sock,
 		return sock_do_ioctl(net, sock, cmd, arg);
 	}
 
-	/* Prevent warning from compat_sys_ioctl, these always
-	 * result in -EINVAL in the native case anyway. */
-	switch (cmd) {
-	case SIOCRTMSG:
-	case SIOCGIFCOUNT:
-	case SIOCSRARP:
-	case SIOCGRARP:
-	case SIOCDRARP:
-	case SIOCSIFLINK:
-	case SIOCGIFSLAVE:
-	case SIOCSIFSLAVE:
-		return -EINVAL;
-	}
-
 	return -ENOIOCTLCMD;
 }