^^&&^^

Edit File: sysc_fstatfs.stp

# fstatfs ____________________________________________________
# long sys_fstatfs(unsigned int fd, struct statfs __user * buf)
# long compat_sys_fstatfs(unsigned int fd, struct compat_statfs __user *buf)
#

@define _SYSCALL_FSTATFS_NAME
%(
	name = "fstatfs"
%)

@define _SYSCALL_FSTATFS_ARGSTR
%(
	argstr = sprintf("%d, %p", fd, buf_uaddr)
%)

@define _SYSCALL_FSTATFS_REGARGS
%(
	fd = int_arg(1)
	buf_uaddr = pointer_arg(2)
%)

probe syscall.fstatfs = dw_syscall.fstatfs !, nd_syscall.fstatfs ? {}
probe syscall.fstatfs.return = dw_syscall.fstatfs.return !, nd_syscall.fstatfs.return ? {}

# dw_fstatfs _____________________________________________________

probe dw_syscall.fstatfs = kernel.function("compat_sys_fstatfs").call ?,
                        kernel.function("sys_fstatfs").call
{
	@_SYSCALL_FSTATFS_NAME
	fd = __int32($fd)
	buf_uaddr = $buf
	@_SYSCALL_FSTATFS_ARGSTR
}
probe dw_syscall.fstatfs.return = kernel.function("compat_sys_fstatfs").return ?,
                               kernel.function("sys_fstatfs").return
{
	@_SYSCALL_FSTATFS_NAME
	@SYSC_RETVALSTR($return)
}

# nd_fstatfs _____________________________________________________

probe nd_syscall.fstatfs = nd1_syscall.fstatfs!, nd2_syscall.fstatfs!, tp_syscall.fstatfs
  { }

probe nd1_syscall.fstatfs = kprobe.function("compat_sys_fstatfs") ?,
                            kprobe.function("sys_fstatfs") ?
{
	@_SYSCALL_FSTATFS_NAME
	asmlinkage()
	@_SYSCALL_FSTATFS_REGARGS
	@_SYSCALL_FSTATFS_ARGSTR
}

/* kernel 4.17+ */
probe nd2_syscall.fstatfs = kprobe.function(@arch_syscall_prefix "compat_sys_fstatfs") ?,
                            kprobe.function(@arch_syscall_prefix "sys_fstatfs") ?
{
	__set_syscall_pt_regs(pointer_arg(1))
	@_SYSCALL_FSTATFS_NAME
	@_SYSCALL_FSTATFS_REGARGS
	@_SYSCALL_FSTATFS_ARGSTR
}

/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.fstatfs = kernel.trace("sys_enter")
{
	__set_syscall_pt_regs($regs)
	@__syscall_compat_gate(@const("__NR_fstatfs"), @const("__NR_compat_fstatfs"))
	@_SYSCALL_FSTATFS_NAME
	@_SYSCALL_FSTATFS_REGARGS
	@_SYSCALL_FSTATFS_ARGSTR
}

probe nd_syscall.fstatfs.return = nd1_syscall.fstatfs.return!, nd2_syscall.fstatfs.return!, tp_syscall.fstatfs.return
  { }

probe nd1_syscall.fstatfs.return = kprobe.function("compat_sys_fstatfs").return ?,
                                   kprobe.function("sys_fstatfs").return ?
{
	@_SYSCALL_FSTATFS_NAME
	@SYSC_RETVALSTR(returnval())
}

/* kernel 4.17+ */
probe nd2_syscall.fstatfs.return = kprobe.function(@arch_syscall_prefix "compat_sys_fstatfs").return ?,
                                   kprobe.function(@arch_syscall_prefix "sys_fstatfs").return ?
{
	@_SYSCALL_FSTATFS_NAME
	@SYSC_RETVALSTR(returnval())
}

/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.fstatfs.return = kernel.trace("sys_exit")
{
	__set_syscall_pt_regs($regs)
	@__syscall_compat_gate(@const("__NR_fstatfs"), @const("__NR_compat_fstatfs"))
	@_SYSCALL_FSTATFS_NAME
	@SYSC_RETVALSTR($ret)
}