[S390] Wire up sys_fallocate.

This patch implements support of fallocate system call on s390(x)
platform.  A wrapper is added to address the issue which s390 ABI has with
the arguments of this system call.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 10 insertions, 0 deletions

diff --git a/arch/s390/kernel/compat_wrapper.S b/arch/s390/kernel/compat_wrapper.S
index acc415457b45..6ee1bedbd1bf 100644
--- a/arch/s390/kernel/compat_wrapper.S
+++ b/arch/s390/kernel/compat_wrapper.S
@@ -1710,3 +1710,13 @@ compat_sys_timerfd_wrapper:
 sys_eventfd_wrapper:
         llgfr   %r2,%r2                 # unsigned int
         jg      sys_eventfd
+
+        .globl  sys_fallocate_wrapper
+sys_fallocate_wrapper:
+        lgfr    %r2,%r2                 # int
+        lgfr    %r3,%r3                 # int
+        sllg    %r4,%r4,32              # get high word of 64bit loff_t
+        lr      %r4,%r5                 # get low word of 64bit loff_t
+        sllg    %r5,%r6,32              # get high word of 64bit loff_t
+        l       %r5,164(%r15)           # get low word of 64bit loff_t
+        jg      sys_fallocate