[v2,02/17] y2038: Remove newstat family from default syscall set
Commit Message
We have four generations of stat() syscalls:
- the oldstat syscalls that are only used on the older architectures
- the newstat family that is used on all 64-bit architectures but
lacked support for large files on 32-bit architectures.
- the stat64 family that is used mostly on 32-bit architectures to
replace newstat
- statx() to replace all of the above, adding 64-bit timestamps among
other things.
We already compile stat64 only on those architectures that need it,
but newstat is always built, including on those that don't reference
it. This adds a new __ARCH_WANT_NEW_STAT symbol along the lines of
__ARCH_WANT_OLD_STAT and __ARCH_WANT_STAT64 to control compilation of
newstat. All architectures that need it use an explict define, the
others now get a little bit smaller, and future architecture (including
64-bit targets) won't ever see it.
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
arch/alpha/include/asm/unistd.h | 1 +
arch/arm/include/asm/unistd.h | 1 +
arch/arm64/include/uapi/asm/unistd.h | 1 +
arch/ia64/include/asm/unistd.h | 2 ++
arch/m68k/include/asm/unistd.h | 1 +
arch/microblaze/include/asm/unistd.h | 1 +
arch/mips/include/asm/unistd.h | 1 +
arch/parisc/include/asm/unistd.h | 1 +
arch/powerpc/include/asm/unistd.h | 1 +
arch/s390/include/asm/unistd.h | 1 +
arch/sh/include/asm/unistd.h | 1 +
arch/sparc/include/asm/unistd.h | 1 +
arch/x86/include/asm/unistd.h | 1 +
arch/xtensa/include/asm/unistd.h | 1 +
fs/stat.c | 3 +++
15 files changed, 18 insertions(+)
Comments
On Mon, Jul 16, 2018 at 06:10:48PM +0200, Arnd Bergmann wrote:
> We have four generations of stat() syscalls:
> - the oldstat syscalls that are only used on the older architectures
> - the newstat family that is used on all 64-bit architectures but
> lacked support for large files on 32-bit architectures.
> - the stat64 family that is used mostly on 32-bit architectures to
> replace newstat
> - statx() to replace all of the above, adding 64-bit timestamps among
> other things.
>
> We already compile stat64 only on those architectures that need it,
> but newstat is always built, including on those that don't reference
> it. This adds a new __ARCH_WANT_NEW_STAT symbol along the lines of
> __ARCH_WANT_OLD_STAT and __ARCH_WANT_STAT64 to control compilation of
> newstat. All architectures that need it use an explict define, the
> others now get a little bit smaller, and future architecture (including
> 64-bit targets) won't ever see it.
>
> Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Do I read this right that you only want to provide statx by default?
It is a little different from the traditional stat calls, so I'd like
to know this is actually ok from libc folks first.
@@ -6,6 +6,7 @@
#define NR_SYSCALLS 523
+#define __ARCH_WANT_NEW_STAT
#define __ARCH_WANT_OLD_READDIR
#define __ARCH_WANT_STAT64
#define __ARCH_WANT_SYS_GETHOSTNAME
@@ -16,6 +16,7 @@
#include <uapi/asm/unistd.h>
#include <asm/unistd-nr.h>
+#define __ARCH_WANT_NEW_STAT
#define __ARCH_WANT_STAT64
#define __ARCH_WANT_SYS_GETHOSTNAME
#define __ARCH_WANT_SYS_PAUSE
@@ -16,5 +16,6 @@
*/
#define __ARCH_WANT_RENAMEAT
+#define __ARCH_WANT_NEW_STAT
#include <asm-generic/unistd.h>
@@ -28,6 +28,8 @@
#define __IGNORE_vfork /* clone() */
#define __IGNORE_umount2 /* umount() */
+#define __ARCH_WANT_NEW_STAT
+
#if !defined(__ASSEMBLY__) && !defined(ASSEMBLER)
#include <linux/types.h>
@@ -7,6 +7,7 @@
#define NR_syscalls 380
+#define __ARCH_WANT_NEW_STAT
#define __ARCH_WANT_OLD_READDIR
#define __ARCH_WANT_OLD_STAT
#define __ARCH_WANT_STAT64
@@ -15,6 +15,7 @@
/* #define __ARCH_WANT_OLD_READDIR */
/* #define __ARCH_WANT_OLD_STAT */
+#define __ARCH_WANT_NEW_STAT
#define __ARCH_WANT_STAT64
#define __ARCH_WANT_SYS_ALARM
#define __ARCH_WANT_SYS_GETHOSTNAME
@@ -24,6 +24,7 @@
#ifndef __ASSEMBLY__
+#define __ARCH_WANT_NEW_STAT
#define __ARCH_WANT_OLD_READDIR
#define __ARCH_WANT_SYS_ALARM
#define __ARCH_WANT_SYS_GETHOSTNAME
@@ -141,6 +141,7 @@ type name(type1 arg1, type2 arg2, type3 arg3, type4 arg4, type5 arg5) \
return K_INLINE_SYSCALL(name, 5, arg1, arg2, arg3, arg4, arg5); \
}
+#define __ARCH_WANT_NEW_STAT
#define __ARCH_WANT_OLD_READDIR
#define __ARCH_WANT_STAT64
#define __ARCH_WANT_SYS_ALARM
@@ -22,6 +22,7 @@
#include <linux/compiler.h>
#include <linux/linkage.h>
+#define __ARCH_WANT_NEW_STAT
#define __ARCH_WANT_OLD_READDIR
#define __ARCH_WANT_STAT64
#define __ARCH_WANT_SYS_ALARM
@@ -15,6 +15,7 @@
#define __IGNORE_pkey_alloc
#define __IGNORE_pkey_free
+#define __ARCH_WANT_NEW_STAT
#define __ARCH_WANT_OLD_READDIR
#define __ARCH_WANT_SYS_ALARM
#define __ARCH_WANT_SYS_GETHOSTNAME
@@ -5,6 +5,7 @@
# include <asm/unistd_64.h>
# endif
+# define __ARCH_WANT_NEW_STAT
# define __ARCH_WANT_OLD_READDIR
# define __ARCH_WANT_OLD_STAT
# define __ARCH_WANT_STAT64
@@ -21,6 +21,7 @@
#else
#define __NR_time 231 /* Linux sparc32 */
#endif
+#define __ARCH_WANT_NEW_STAT
#define __ARCH_WANT_OLD_READDIR
#define __ARCH_WANT_STAT64
#define __ARCH_WANT_SYS_ALARM
@@ -31,6 +31,7 @@
# endif
+# define __ARCH_WANT_NEW_STAT
# define __ARCH_WANT_OLD_READDIR
# define __ARCH_WANT_OLD_STAT
# define __ARCH_WANT_SYS_ALARM
@@ -5,6 +5,7 @@
#define __ARCH_WANT_SYS_CLONE
#include <uapi/asm/unistd.h>
+#define __ARCH_WANT_NEW_STAT
#define __ARCH_WANT_STAT64
#define __ARCH_WANT_SYS_UTIME
#define __ARCH_WANT_SYS_LLSEEK
@@ -280,6 +280,8 @@ SYSCALL_DEFINE2(fstat, unsigned int, fd, struct __old_kernel_stat __user *, stat
#endif /* __ARCH_WANT_OLD_STAT */
+#ifdef __ARCH_WANT_NEW_STAT
+
#if BITS_PER_LONG == 32
# define choose_32_64(a,b) a
#else
@@ -378,6 +380,7 @@ SYSCALL_DEFINE2(newfstat, unsigned int, fd, struct stat __user *, statbuf)
return error;
}
+#endif
static int do_readlinkat(int dfd, const char __user *pathname,
char __user *buf, int bufsiz)