s390/uapi: cover statfs padding by growing f_spare

pahole says:

struct compat_statfs64 {
...
u32 f_spare[4]; /* 68 16 */
/* size: 88, cachelines: 1, members: 12 */
/* padding: 4 */

struct statfs {
...
unsigned int f_spare[4]; /* 68 16 */
/* size: 88, cachelines: 1, members: 12 */
/* padding: 4 */

struct statfs64 {
...
unsigned int f_spare[4]; /* 68 16 */
/* size: 88, cachelines: 1, members: 12 */
/* padding: 4 */

One has to keep the existence of padding in mind when working with
these structs. Grow f_spare arrays to 5 in order to simplify things.

Acked-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Link: https://lore.kernel.org/r/20230504144021.808932-3-iii@linux.ibm.com
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>

License cleanup: add SPDX license identifier to uapi header files with no license

Many user space API headers are missing licensing information, which
makes it hard for compliance tools to determine the correct license.

By default are files without license information under the default
license of the kernel, which is GPLV2. Marking them GPLV2 would exclude
them from being included in non GPLV2 code, which is obviously not
intended. The user space API headers fall under the syscall exception
which is in the kernels COPYING file:

NOTE! This copyright does *not* cover user programs that use kernel
services by normal system calls - this is merely considered normal use
of the kernel, and does *not* fall under the heading of "derived work".

otherwise syscall usage would not be possible.

Update the files which contain no license information with an SPDX
license identifier. The chosen identifier is 'GPL-2.0 WITH
Linux-syscall-note' which is the officially assigned identifier for the
Linux syscall exception. SPDX license identifiers are a legally binding
shorthand, which can be used instead of the full boiler plate text.

This patch is based on work done by Thomas Gleixner and Kate Stewart and
Philippe Ombredanne. See the previous patch in this series for the
methodology of how this patch was researched.

Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org>
Reviewed-by: Philippe Ombredanne <pombredanne@nexb.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

s390/uapi: fix struct statfs64 definition

With b8668fd0a7e1b59f "s390/uapi: change struct statfs[64] member types
to unsigned values" the size of a couple of struct statfs64 member got
incorrectly changed from 64 to 32 bit for 32 bit builds.

Fix this by changing the type of couple of struct statfs64 members from
unsigned long to unsigned long long.
The definition of struct compat_statfs64 was correct however.

Cc: stable@vger.kernel.org # v3.10+
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

s390/uapi: change struct statfs[64] member types to unsigned values

Kay Sievers reported that coreutils' stat tool has a problem with
s390's statfs[64] definition:

> The definition of struct statfs::f_type needs a fix. s390 is the only
> architecture in the kernel that uses an int and expects magic
> constants lager than INT_MAX to fit into.
>
> A fix is needed to make Fedora boot on s390, it currently fails to do
> so. Userspace does not want to add code to paper-over this issue.

[...]

> Even coreutils cannot handle it:
> #define RAMFS_MAGIC 0x858458f6
> # stat -f -c%t /
> ffffffff858458f6
>
> #define BTRFS_SUPER_MAGIC 0x9123683E
> # stat -f -c%t /mnt
> ffffffff9123683e

The bug is caused by an implicit sign extension within the stat tool:

out_uint_x (pformat, prefix_len, statfsbuf->f_type);

where the format finally will be "%lx".
A similar problem can be found in the 'tail' tool.
s390 is the only architecture which has an int type f_type member in
struct statfs[64]. Other architectures have either unsigned ints or
long values, so that the problem doesn't occur there.

Therefore change the type of the f_type member to unsigned int, so
that we get zero extension instead of sign extension when assignment to
a long value happens.

This patch changes the s390 uapi struct stafs[64] definition in the kernel
to contain only unsigned values.
This was true for 32 bit builds anyway, since we use the generic uapi
header file in that case. So lets not include conditionally the generic
uapi header file but have the s390 implementation completely independent.

Also fix the types of struct compat_stafs to match reality and move the
definition of struct compat_statfs64 to asm/compat.h since it is not part
of the api.

Reported-by: Kay Sievers <kay@vrfy.org>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

UAPI: (Scripted) Disintegrate arch/s390/include/asm

Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Michael Kerrisk <mtk.manpages@gmail.com>
Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Acked-by: Dave Jones <davej@redhat.com>