syscall: correct argument order for SyncFileRange syscall on linux/ppc64{,le}

On linux/ppc64{,le} the SYS_SYNC_FILE_RANGE2 syscall is used to
implement SyncFileRange. This syscall has a different argument order
than SYS_SYNC_FILE_RANGE. Apart from that the implementations of both
syscalls are the same, so use a simple wrapper to invoke the syscall
with the correct argument order.

For context see:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=edd5cd4a9424f22b0fa08bef5e299d41befd5622

Updates #27485

Change-Id: Ib94fb98376bf6c879df6f1b68c3bdd11ebcb5a44
Reviewed-on: https://go-review.googlesource.com/133195
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

src/syscall/syscall_linux_ppc64x.go

@@ -45,7 +45,6 @@ const (
 //sys	Splice(rfd int, roff *int64, wfd int, woff *int64, len int, flags int) (n int64, err error)
 //sys	Stat(path string, stat *Stat_t) (err error)
 //sys	Statfs(path string, buf *Statfs_t) (err error)
-//sys	SyncFileRange(fd int, off int64, n int64, flags int) (err error) = SYS_SYNC_FILE_RANGE2
 //sys	Truncate(path string, length int64) (err error)
 //sys	accept(s int, rsa *RawSockaddrAny, addrlen *_Socklen) (fd int, err error)
 //sys	accept4(s int, rsa *RawSockaddrAny, addrlen *_Socklen, flags int) (fd int, err error)
@@ -120,3 +119,11 @@ func (cmsg *Cmsghdr) SetLen(length int) {
 func rawVforkSyscall(trap, a1 uintptr) (r1 uintptr, err Errno) {
 	panic("not implemented")
 }
+
+//sys	syncFileRange2(fd int, flags int, off int64, n int64) (err error) = SYS_SYNC_FILE_RANGE2
+
+func SyncFileRange(fd int, off int64, n int64, flags int) error {
+	// The sync_file_range and sync_file_range2 syscalls differ only in the
+	// order of their arguments.
+	return syncFileRange2(fd, flags, off, n)
+}

src/syscall/zsyscall_linux_ppc64.go

@@ -1504,16 +1504,6 @@ func Statfs(path string, buf *Statfs_t) (err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func SyncFileRange(fd int, off int64, n int64, flags int) (err error) {
-	_, _, e1 := Syscall6(SYS_SYNC_FILE_RANGE2, uintptr(fd), uintptr(off), uintptr(n), uintptr(flags), 0, 0)
-	if e1 != 0 {
-		err = errnoErr(e1)
-	}
-	return
-}
-
-// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
-
 func Truncate(path string, length int64) (err error) {
 	var _p0 *byte
 	_p0, err = BytePtrFromString(path)
@@ -1764,3 +1754,13 @@ func pipe2(p *[2]_C_int, flags int) (err error) {
 	}
 	return
 }
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func syncFileRange2(fd int, flags int, off int64, n int64) (err error) {
+	_, _, e1 := Syscall6(SYS_SYNC_FILE_RANGE2, uintptr(fd), uintptr(flags), uintptr(off), uintptr(n), 0, 0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}

src/syscall/zsyscall_linux_ppc64le.go

@@ -1504,16 +1504,6 @@ func Statfs(path string, buf *Statfs_t) (err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func SyncFileRange(fd int, off int64, n int64, flags int) (err error) {
-	_, _, e1 := Syscall6(SYS_SYNC_FILE_RANGE2, uintptr(fd), uintptr(off), uintptr(n), uintptr(flags), 0, 0)
-	if e1 != 0 {
-		err = errnoErr(e1)
-	}
-	return
-}
-
-// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
-
 func Truncate(path string, length int64) (err error) {
 	var _p0 *byte
 	_p0, err = BytePtrFromString(path)
@@ -1764,3 +1754,13 @@ func pipe2(p *[2]_C_int, flags int) (err error) {
 	}
 	return
 }
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func syncFileRange2(fd int, flags int, off int64, n int64) (err error) {
+	_, _, e1 := Syscall6(SYS_SYNC_FILE_RANGE2, uintptr(fd), uintptr(flags), uintptr(off), uintptr(n), 0, 0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}