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# sync_file_range ____________________________________________
#
# Why is there a 'sync_file_range' and a 'sync_file_range2'? As the
# man page says:
#
# Some architectures (e.g., PowerPC, ARM) need 64-bit arguments to be
# aligned in a suitable pair of registers. On such architectures, the
# call signature of sync_file_range()... would force a register to be
# be wasted as padding between the 'fd' and 'offset' arguments.
#
# SYSCALL_DEFINE4(sync_file_range, int, fd, loff_t, offset, loff_t, nbytes,
# unsigned int, flags)
# SYSCALL_DEFINE4(sync_file_range2, int, fd, unsigned int, flags,
# loff_t, offset, loff_t, nbytes)
#
# But, sync_file_range2() is just a wrapper around sync_file_range, so
# we can just probe that.
@define _SYSCALL_SYNC_FILE_RANGE_NAME
%(
name = "sync_file_range"
%)
@define _SYSCALL_SYNC_FILE_RANGE_ARGSTR
%(
argstr = sprintf("%d, %d, %d, %s", fd, offset, nbytes, flags_str)
%)
probe syscall.sync_file_range = dw_syscall.sync_file_range !,
nd_syscall.sync_file_range ? {}
probe syscall.sync_file_range.return = dw_syscall.sync_file_range.return !,
nd_syscall.sync_file_range.return ? {}
# dw_sync_file_range _____________________________________________________
probe dw_syscall.sync_file_range = kernel.function("sys_sync_file_range").call ?
{
@_SYSCALL_SYNC_FILE_RANGE_NAME
fd = __int32($fd)
offset = $offset
nbytes = $nbytes
flags = __uint32($flags)
flags_str = _sync_file_range_flags_str(flags)
@_SYSCALL_SYNC_FILE_RANGE_ARGSTR
}
probe dw_syscall.sync_file_range.return =
kernel.function("sys_sync_file_range").return ?
{
@_SYSCALL_SYNC_FILE_RANGE_NAME
@SYSC_RETVALSTR($return)
}
# nd_sync_file_range _____________________________________________________
probe nd_syscall.sync_file_range = nd1_syscall.sync_file_range!, nd2_syscall.sync_file_range!, tp_syscall.sync_file_range
{ }
probe nd1_syscall.sync_file_range = kprobe.function("sys_sync_file_range") ?
{
asmlinkage()
@_SYSCALL_SYNC_FILE_RANGE_NAME
fd = int_arg(1)
%( CONFIG_64BIT == "y" %?
offset = longlong_arg(2)
nbytes = longlong_arg(3)
flags = uint_arg(4)
%:
%( arch == "arm" %?
# arm has some odd rules regarding long long arguments.
offset = longlong_arg(3)
nbytes = longlong_arg(5)
flags = uint_arg(7)
%:
offset = longlong_arg(2)
nbytes = longlong_arg(4)
flags = uint_arg(6)
%)
%)
flags_str = _sync_file_range_flags_str(flags)
@_SYSCALL_SYNC_FILE_RANGE_ARGSTR
}
/* kernel 4.17+ */
probe nd2_syscall.sync_file_range = __nd2_syscall.sync_file_range,
__nd2_syscall.compat_sync_file_range
{
@_SYSCALL_SYNC_FILE_RANGE_NAME
@_SYSCALL_SYNC_FILE_RANGE_ARGSTR
}
probe __nd2_syscall.sync_file_range =
kprobe.function(@arch_syscall_prefix "sys_sync_file_range") ?
{
__set_syscall_pt_regs(pointer_arg(1))
fd = int_arg(1)
offset = longlong_arg(2)
nbytes = longlong_arg(3)
flags = uint_arg(4)
flags_str = _sync_file_range_flags_str(flags)
},
{
%( @_IS_SREG_KERNEL %?
if (@probewrite(fd))
set_int_arg(1, fd)
if (@probewrite(offset))
set_longlong_arg(2, offset)
if (@probewrite(nbytes))
set_longlong_arg(3, nbytes)
if (@probewrite(flags))
set_uint_arg(4, flags)
%)
}
probe __nd2_syscall.compat_sync_file_range =
kprobe.function(@arch_syscall_prefix "compat_sys_x86_sync_file_range") ?
{
__set_syscall_pt_regs(pointer_arg(1))
fd = int_arg(1)
offset = (uint_arg(3) << 32) | uint_arg(2)
nbytes = (uint_arg(5) << 32) | uint_arg(4)
flags = uint_arg(6)
flags_str = _sync_file_range_flags_str(flags)
},
{
%( @_IS_SREG_KERNEL %?
if (@probewrite(fd))
set_int_arg(1, fd)
if (@probewrite(offset)) {
set_uint_arg(2, offset & 0xffffffff)
set_uint_arg(3, offset >> 32)
}
if (@probewrite(nbytes)) {
set_uint_arg(4, nbytes & 0xffffffff)
set_uint_arg(5, nbytes >> 32)
}
if (@probewrite(flags))
set_uint_arg(6, flags)
%)
}
/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.sync_file_range = kernel.trace("sys_enter")
{
__set_syscall_pt_regs($regs)
@__syscall_compat_gate(@const("__NR_sync_file_range"),
@const("__NR_compat_sync_file_range"))
@_SYSCALL_SYNC_FILE_RANGE_NAME
fd = int_arg(1)
if (@__compat_task) {
offset = (uint_arg(3) << 32) | uint_arg(2)
nbytes = (uint_arg(5) << 32) | uint_arg(4)
flags = uint_arg(6)
}
else {
offset = longlong_arg(2)
nbytes = longlong_arg(3)
flags = uint_arg(4)
}
flags_str = _sync_file_range_flags_str(flags)
@_SYSCALL_SYNC_FILE_RANGE_ARGSTR
},
{
%( @_IS_SREG_KERNEL %?
if (@probewrite(fd))
set_int_arg(1, fd)
if (@__compat_task) {
if (@probewrite(offset)) {
set_uint_arg(2, offset & 0xffffffff)
set_uint_arg(3, offset >> 32)
}
if (@probewrite(nbytes)) {
set_uint_arg(4, nbytes & 0xffffffff)
set_uint_arg(5, nbytes >> 32)
}
if (@probewrite(flags))
set_uint_arg(6, flags)
} else {
if (@probewrite(offset))
set_longlong_arg(2, offset)
if (@probewrite(nbytes))
set_longlong_arg(3, nbytes)
if (@probewrite(flags))
set_uint_arg(4, flags)
}
%)
}
probe nd_syscall.sync_file_range.return = nd1_syscall.sync_file_range.return!, nd2_syscall.sync_file_range.return!, tp_syscall.sync_file_range.return
{ }
probe nd1_syscall.sync_file_range.return =
kprobe.function("sys_sync_file_range").return ?
{
@_SYSCALL_SYNC_FILE_RANGE_NAME
@SYSC_RETVALSTR(returnval())
}
/* kernel 4.17+ */
probe nd2_syscall.sync_file_range.return =
kprobe.function(@arch_syscall_prefix "sys_sync_file_range").return ?,
kprobe.function(@arch_syscall_prefix "compat_sys_x86_sync_file_range").return ?
{
@_SYSCALL_SYNC_FILE_RANGE_NAME
@SYSC_RETVALSTR(returnval())
}
/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.sync_file_range.return = kernel.trace("sys_exit")
{
__set_syscall_pt_regs($regs)
@__syscall_compat_gate(@const("__NR_sync_file_range"),
@const("__NR_compat_sync_file_range"))
@_SYSCALL_SYNC_FILE_RANGE_NAME
@SYSC_RETVALSTR($ret)
}