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 "preferred" ordering of arguments in this system call (i.e. int, int, loff_t, loff_t). I will request s390 experts to please review this code and verify if this patch is correct. Thanks! Signed-off-by: Amit Arora <aarora@xxxxxxxxxx> --- arch/s390/kernel/compat_wrapper.S | 10 ++++++++++ arch/s390/kernel/sys_s390.c | 10 ++++++++++ arch/s390/kernel/syscalls.S | 1 + include/asm-s390/unistd.h | 3 ++- 4 files changed, 23 insertions(+), 1 deletion(-) Index: linux-2.6.21/arch/s390/kernel/compat_wrapper.S =================================================================== --- linux-2.6.21.orig/arch/s390/kernel/compat_wrapper.S +++ linux-2.6.21/arch/s390/kernel/compat_wrapper.S @@ -1682,3 +1682,13 @@ compat_sys_utimes_wrapper: llgtr %r2,%r2 # char * llgtr %r3,%r3 # struct compat_timeval * jg compat_sys_utimes + + .globl s390_fallocate_wrapper +s390_fallocate_wrapper: + lgfr %r2,%r2 # int + sllg %r3,%r3,32 # get high word of 64bit loff_t + or %r3,%r4 # get low word of 64bit loff_t + sllg %r4,%r5,32 # get high word of 64bit loff_t + or %r4,%r6 # get low word of 64bit loff_t + llgf %r5,164(%r15) # unsigned int + jg s390_fallocate Index: linux-2.6.21/arch/s390/kernel/sys_s390.c =================================================================== --- linux-2.6.21.orig/arch/s390/kernel/sys_s390.c +++ linux-2.6.21/arch/s390/kernel/sys_s390.c @@ -268,6 +268,16 @@ s390_fadvise64_64(struct fadvise64_64_ar } /* + * This is a wrapper to call sys_fallocate(). Since s390 ABI has a problem + * with the int, int, loff_t, loff_t ordering of arguments, this wrapper + * is required. + */ +asmlinkage long s390_fallocate(int fd, loff_t offset, loff_t len, int mode) +{ + return sys_fallocate(fd, mode, offset, len); +} + +/* * Do a system call from kernel instead of calling sys_execve so we * end up with proper pt_regs. */ Index: linux-2.6.21/arch/s390/kernel/syscalls.S =================================================================== --- linux-2.6.21.orig/arch/s390/kernel/syscalls.S +++ linux-2.6.21/arch/s390/kernel/syscalls.S @@ -322,3 +322,4 @@ 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) +SYSCALL(s390_fallocate,s390_fallocate,s390_fallocate_wrapper) Index: linux-2.6.21/include/asm-s390/unistd.h =================================================================== --- linux-2.6.21.orig/include/asm-s390/unistd.h +++ linux-2.6.21/include/asm-s390/unistd.h @@ -251,8 +251,9 @@ #define __NR_getcpu 311 #define __NR_epoll_pwait 312 #define __NR_utimes 313 +#define __NR_fallocate 314 -#define NR_syscalls 314 +#define NR_syscalls 315 /* * There are some system calls that are not present on 64 bit, some - To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html