[PATCH] fstatat64 support

The *at patches introduced fstatat and, due to inusfficient research, I
used the newfstat functions generally as the guideline.  The result is that
on 32-bit platforms we don't have all the information needed to implement
fstatat64.

This patch modifies the code to pass up 64-bit information if
__ARCH_WANT_STAT64 is defined.  I renamed the syscall entry point to make
this clear.  Other archs will continue to use the existing code.  On x86-64
the compat code is implemented using a new sys32_ function.  this is what
is done for the other stat syscalls as well.

This patch might break some other archs (those which define
__ARCH_WANT_STAT64 and which already wired up the syscall).  Yet others
might need changes to accomodate the compatibility mode.  I really don't
want to do that work because all this stat handling is a mess (more so in
glibc, but the kernel is also affected).  It should be done by the arch
maintainers.  I'll provide some stand-alone test shortly.  Those who are
eager could compile glibc and run 'make check' (no installation needed).

The patch below has been tested on x86 and x86-64.

Signed-off-by: Ulrich Drepper <drepper@redhat.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Andi Kleen <ak@muc.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

3 files changed, 4 insertions, 2 deletions

diff --git a/include/asm-i386/unistd.h b/include/asm-i386/unistd.h
index cf6f2cd9c514..dc81a55dd94d 100644
--- a/include/asm-i386/unistd.h
+++ b/include/asm-i386/unistd.h
@@ -305,7 +305,7 @@
 #define __NR_mknodat            297
 #define __NR_fchownat           298
 #define __NR_futimesat          299
-#define __NR_newfstatat         300
+#define __NR_fstatat64          300
 #define __NR_unlinkat           301
 #define __NR_renameat           302
 #define __NR_linkat             303
diff --git a/include/asm-x86_64/ia32_unistd.h b/include/asm-x86_64/ia32_unistd.h
index 20468983d453..eeb2bcd635de 100644
--- a/include/asm-x86_64/ia32_unistd.h
+++ b/include/asm-x86_64/ia32_unistd.h
@@ -305,7 +305,7 @@
 #define __NR_ia32_mknodat               297
 #define __NR_ia32_fchownat              298
 #define __NR_ia32_futimesat             299
-#define __NR_ia32_newfstatat            300
+#define __NR_ia32_fstatat64             300
 #define __NR_ia32_unlinkat              301
 #define __NR_ia32_renameat              302
 #define __NR_ia32_linkat                303
diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h
index 3877209d23c3..d73501ba7e44 100644
--- a/include/linux/syscalls.h
+++ b/include/linux/syscalls.h
@@ -557,6 +557,8 @@ asmlinkage long sys_openat(int dfd, const char __user *filename, int flags,
                            int mode);
 asmlinkage long sys_newfstatat(int dfd, char __user *filename,
                                struct stat __user *statbuf, int flag);
+asmlinkage long sys_fstatat64(int dfd, char __user *filename,
+                               struct stat64 __user *statbuf, int flag);
 asmlinkage long sys_readlinkat(int dfd, const char __user *path, char __user *buf,
                                int bufsiz);
 asmlinkage long compat_sys_futimesat(unsigned int dfd, char __user *filename,