[patch 9/9] Wire up sys_fallocate.

Martin Schwidefsky
2007-07-23T08:45:57Z

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From: Martin Schwidefsky <schwidefsky@de.ibm.com>

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>
---

arch/s390/kernel/compat_wrapper.S | 10 ++++++++++
arch/s390/kernel/sys_s390.c | 20 ++++++++++++++++++++
arch/s390/kernel/syscalls.S | 2 +-
include/asm-s390/unistd.h | 2 +-
4 files changed, 32 insertions(+), 2 deletions(-)

Index: quilt-2.6/arch/s390/kernel/compat_wrapper.S
===================================================================
--- quilt-2.6.orig/arch/s390/kernel/compat_wrapper.S
+++ quilt-2.6/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
Index: quilt-2.6/arch/s390/kernel/syscalls.S
===================================================================
--- quilt-2.6.orig/arch/s390/kernel/syscalls.S
+++ quilt-2.6/arch/s390/kernel/syscalls.S
@@ -322,7 +322,7 @@ NI_SYSCALL /* 310 sys_move_pages *
SYSCALL(sys_getcpu,sys_getcpu,sys_getcpu_wrapper)
SYSCALL(sys_epoll_pwait,sys_epoll_pwait,compat_sys_epoll_pwait_wrapper)
SYSCALL(sys_utimes,sys_utimes,compat_sys_utimes_wrapper)
-NI_SYSCALL /* 314 sys_fallocate */
+SYSCALL(s390_fallocate,sys_fallocate,sys_fallocate_wrapper)
SYSCALL(sys_utimensat,sys_utimensat,compat_sys_utimensat_wrapper) /* 315 */
SYSCALL(sys_signalfd,sys_signalfd,compat_sys_signalfd_wrapper)
SYSCALL(sys_timerfd,sys_timerfd,compat_sys_timerfd_wrapper)
Index: quilt-2.6/arch/s390/kernel/sys_s390.c
===================================================================
--- quilt-2.6.orig/arch/s390/kernel/sys_s390.c
+++ quilt-2.6/arch/s390/kernel/sys_s390.c
@@ -265,3 +265,23 @@ s390_fadvise64_64(struct fadvise64_64_ar
return -EFAULT;
return sys_fadvise64_64(a.fd, a.offset, a.len, a.advice);
}
+
+#ifndef CONFIG_64BIT
+/*
+ * This is a wrapper to call sys_fallocate(). For 31 bit s390 the last
+ * 64 bit argument "len" is split into the upper and lower 32 bits. The
+ * system call wrapper in the user space loads the value to %r6/%r7.
+ * The code in entry.S keeps the values in %r2 - %r6 where they are and
+ * stores %r7 to 96(%r15). But the standard C linkage requires that
+ * the whole 64 bit value for len is stored on the stack and doesn't
+ * use %r6 at all. So s390_fallocate has to convert the arguments from
+ * %r2: fd, %r3: mode, %r4/%r5: offset, %r6/96(%r15)-99(%r15): len
+ * to
+ * %r2: fd, %r3: mode, %r4/%r5: offset, 96(%r15)-103(%r15): len
+ */
+asmlinkage long s390_fallocate(int fd, int mode, loff_t offset,
+ u32 len_high, u32 len_low)
+{
+ return sys_fallocate(fd, mode, offset, ((u64)len_high << 32) | len_low);
+}
+#endif
Index: quilt-2.6/include/asm-s390/unistd.h
===================================================================
--- quilt-2.6.orig/include/asm-s390/unistd.h
+++ quilt-2.6/include/asm-s390/unistd.h
@@ -251,7 +251,7 @@
#define __NR_getcpu 311
#define __NR_epoll_pwait 312
#define __NR_utimes 313
-/* Number 314 is reserved for new sys_fallocate */
+#define __NR_fallocate 314
#define __NR_utimensat 315
#define __NR_signalfd 316
#define __NR_timerfd 317