[PATCH] s390: fstatat64 support

Add fstatat64 support to s390 in order to follow changes with
commit cff2b760 .
Also fixes compilation for 31 bit.
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

arch/s390/kernel/compat_linux.c

@@ -905,6 +905,26 @@ asmlinkage long sys32_fstat64(unsigned long fd, struct stat64_emu31 __user * sta
 	return ret;
 }
 
+asmlinkage long sys32_fstatat(unsigned int dfd, char __user *filename,
+			      struct stat64_emu31 __user* statbuf, int flag)
+{
+	struct kstat stat;
+	int error = -EINVAL;
+
+	if ((flag & ~AT_SYMLINK_NOFOLLOW) != 0)
+		goto out;
+
+	if (flag & AT_SYMLINK_NOFOLLOW)
+		error = vfs_lstat_fd(dfd, filename, &stat);
+	else
+		error = vfs_stat_fd(dfd, filename, &stat);
+
+	if (!error)
+		error = cp_stat64(statbuf, &stat);
+out:
+	return error;
+}
+
 /*
  * Linux/i386 didn't use to be able to handle more than
  * 4 system call parameters, so these system calls used a memory

arch/s390/kernel/compat_wrapper.S

@@ -1523,13 +1523,13 @@ compat_sys_futimesat_wrapper:
 	llgtr	%r4,%r4			# struct timeval *
 	jg	compat_sys_futimesat
 
-	.globl compat_sys_newfstatat_wrapper
-compat_sys_newfstatat_wrapper:
+	.globl sys32_fstatat_wrapper
+sys32_fstatat_wrapper:
 	llgfr	%r2,%r2			# unsigned int
 	llgtr	%r3,%r3			# char *
-	llgtr	%r4,%r4			# struct stat *
+	llgtr	%r4,%r4			# struct stat64 *
 	lgfr	%r5,%r5			# int
-	jg	compat_sys_newfstatat
+	jg	sys32_fstatat
 
 	.globl sys_unlinkat_wrapper
 sys_unlinkat_wrapper:

arch/s390/kernel/syscalls.S

@@ -301,7 +301,7 @@ SYSCALL(sys_mkdirat,sys_mkdirat,sys_mkdirat_wrapper)
 SYSCALL(sys_mknodat,sys_mknodat,sys_mknodat_wrapper)	/* 290 */
 SYSCALL(sys_fchownat,sys_fchownat,sys_fchownat_wrapper)
 SYSCALL(sys_futimesat,sys_futimesat,compat_sys_futimesat_wrapper)
-SYSCALL(sys_newfstatat,sys_newfstatat,compat_sys_newfstatat_wrapper)
+SYSCALL(sys_fstatat64,sys_newfstatat,sys32_fstatat_wrapper)
 SYSCALL(sys_unlinkat,sys_unlinkat,sys_unlinkat_wrapper)
 SYSCALL(sys_renameat,sys_renameat,sys_renameat_wrapper)	/* 295 */
 SYSCALL(sys_linkat,sys_linkat,sys_linkat_wrapper)

include/asm-s390/unistd.h

@@ -285,7 +285,7 @@
 #define __NR_mknodat		290
 #define __NR_fchownat		291
 #define __NR_futimesat		292
-#define __NR_newfstatat		293
+#define __NR_fstatat64		293
 #define __NR_unlinkat		294
 #define __NR_renameat		295
 #define __NR_linkat		296
@@ -359,6 +359,7 @@
 #undef  __NR_fcntl64
 #undef  __NR_sendfile64
 #undef  __NR_fadvise64_64
+#undef  __NR_fstatat64
 
 #define __NR_select		142
 #define __NR_getrlimit		191	/* SuS compliant getrlimit */
@@ -381,6 +382,7 @@
 #define __NR_setgid  		214
 #define __NR_setfsuid  		215
 #define __NR_setfsgid  		216
+#define __NR_newfstatat		293
 
 #endif