[PATCH] s390: fstatat64 support

Add fstatat64 support to s390 in order to follow changes with
commit cff2b760096d1e6feaa31948e7af4abbefe47822 .
Also fixes compilation for 31 bit.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

4 files changed, 28 insertions, 6 deletions

diff --git a/arch/s390/kernel/compat_linux.c b/arch/s390/kernel/compat_linux.c
index cc20f0e3a7d3..2d021626c1a6 100644
--- a/arch/s390/kernel/compat_linux.c
+++ b/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
diff --git a/arch/s390/kernel/compat_wrapper.S b/arch/s390/kernel/compat_wrapper.S
index 38a6ef5ec624..dd2d6c3e8df8 100644
--- a/arch/s390/kernel/compat_wrapper.S
+++ b/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:
diff --git a/arch/s390/kernel/syscalls.S b/arch/s390/kernel/syscalls.S
index e86a4debb160..84921fe8d266 100644
--- a/arch/s390/kernel/syscalls.S
+++ b/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)
diff --git a/include/asm-s390/unistd.h b/include/asm-s390/unistd.h
index 0a2f6664c4cf..657d582e8149 100644
--- a/include/asm-s390/unistd.h
+++ b/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