unix: add Syncfs function on Linux

Syncfs is Linux-specific system call to synchronize to disk one
filesystem specified by fd to any of its files.

See http://man7.org/linux/man-pages/man2/syncfs.2.html for details.

Change-Id: Ia2ad6208c3fa0e9c40d5112ce938edd5d374131d
Reviewed-on: https://go-review.googlesource.com/51510
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

unix/syscall_linux.go

@@ -1279,6 +1279,7 @@ func Setgid(uid int) (err error) {
 //sys	Setpriority(which int, who int, prio int) (err error)
 //sys	Setxattr(path string, attr string, data []byte, flags int) (err error)
 //sys	Sync()
+//sys	Syncfs(fd int) (err error)
 //sysnb	Sysinfo(info *Sysinfo_t) (err error)
 //sys	Tee(rfd int, wfd int, len int, flags int) (n int64, err error)
 //sysnb	Tgkill(tgid int, tid int, sig syscall.Signal) (err error)

unix/zsyscall_linux_386.go

@@ -1234,6 +1234,16 @@ func Sync() {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
+func Syncfs(fd int) (err error) {
+	_, _, e1 := Syscall(SYS_SYNCFS, uintptr(fd), 0, 0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
 func Sysinfo(info *Sysinfo_t) (err error) {
 	_, _, e1 := RawSyscall(SYS_SYSINFO, uintptr(unsafe.Pointer(info)), 0, 0)
 	if e1 != 0 {

unix/zsyscall_linux_amd64.go

@@ -1234,6 +1234,16 @@ func Sync() {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
+func Syncfs(fd int) (err error) {
+	_, _, e1 := Syscall(SYS_SYNCFS, uintptr(fd), 0, 0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
 func Sysinfo(info *Sysinfo_t) (err error) {
 	_, _, e1 := RawSyscall(SYS_SYSINFO, uintptr(unsafe.Pointer(info)), 0, 0)
 	if e1 != 0 {

unix/zsyscall_linux_arm.go

@@ -1234,6 +1234,16 @@ func Sync() {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
+func Syncfs(fd int) (err error) {
+	_, _, e1 := Syscall(SYS_SYNCFS, uintptr(fd), 0, 0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
 func Sysinfo(info *Sysinfo_t) (err error) {
 	_, _, e1 := RawSyscall(SYS_SYSINFO, uintptr(unsafe.Pointer(info)), 0, 0)
 	if e1 != 0 {

unix/zsyscall_linux_arm64.go

@@ -1234,6 +1234,16 @@ func Sync() {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
+func Syncfs(fd int) (err error) {
+	_, _, e1 := Syscall(SYS_SYNCFS, uintptr(fd), 0, 0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
 func Sysinfo(info *Sysinfo_t) (err error) {
 	_, _, e1 := RawSyscall(SYS_SYSINFO, uintptr(unsafe.Pointer(info)), 0, 0)
 	if e1 != 0 {

unix/zsyscall_linux_mips.go

@@ -1234,6 +1234,16 @@ func Sync() {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
+func Syncfs(fd int) (err error) {
+	_, _, e1 := Syscall(SYS_SYNCFS, uintptr(fd), 0, 0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
 func Sysinfo(info *Sysinfo_t) (err error) {
 	_, _, e1 := RawSyscall(SYS_SYSINFO, uintptr(unsafe.Pointer(info)), 0, 0)
 	if e1 != 0 {

unix/zsyscall_linux_mips64.go

@@ -1234,6 +1234,16 @@ func Sync() {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
+func Syncfs(fd int) (err error) {
+	_, _, e1 := Syscall(SYS_SYNCFS, uintptr(fd), 0, 0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
 func Sysinfo(info *Sysinfo_t) (err error) {
 	_, _, e1 := RawSyscall(SYS_SYSINFO, uintptr(unsafe.Pointer(info)), 0, 0)
 	if e1 != 0 {

unix/zsyscall_linux_mips64le.go

@@ -1234,6 +1234,16 @@ func Sync() {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
+func Syncfs(fd int) (err error) {
+	_, _, e1 := Syscall(SYS_SYNCFS, uintptr(fd), 0, 0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
 func Sysinfo(info *Sysinfo_t) (err error) {
 	_, _, e1 := RawSyscall(SYS_SYSINFO, uintptr(unsafe.Pointer(info)), 0, 0)
 	if e1 != 0 {

unix/zsyscall_linux_mipsle.go

@@ -1234,6 +1234,16 @@ func Sync() {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
+func Syncfs(fd int) (err error) {
+	_, _, e1 := Syscall(SYS_SYNCFS, uintptr(fd), 0, 0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
 func Sysinfo(info *Sysinfo_t) (err error) {
 	_, _, e1 := RawSyscall(SYS_SYSINFO, uintptr(unsafe.Pointer(info)), 0, 0)
 	if e1 != 0 {

unix/zsyscall_linux_ppc64.go

@@ -1234,6 +1234,16 @@ func Sync() {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
+func Syncfs(fd int) (err error) {
+	_, _, e1 := Syscall(SYS_SYNCFS, uintptr(fd), 0, 0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
 func Sysinfo(info *Sysinfo_t) (err error) {
 	_, _, e1 := RawSyscall(SYS_SYSINFO, uintptr(unsafe.Pointer(info)), 0, 0)
 	if e1 != 0 {

unix/zsyscall_linux_ppc64le.go

@@ -1234,6 +1234,16 @@ func Sync() {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
+func Syncfs(fd int) (err error) {
+	_, _, e1 := Syscall(SYS_SYNCFS, uintptr(fd), 0, 0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
 func Sysinfo(info *Sysinfo_t) (err error) {
 	_, _, e1 := RawSyscall(SYS_SYSINFO, uintptr(unsafe.Pointer(info)), 0, 0)
 	if e1 != 0 {

unix/zsyscall_linux_s390x.go

@@ -1234,6 +1234,16 @@ func Sync() {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
+func Syncfs(fd int) (err error) {
+	_, _, e1 := Syscall(SYS_SYNCFS, uintptr(fd), 0, 0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
 func Sysinfo(info *Sysinfo_t) (err error) {
 	_, _, e1 := RawSyscall(SYS_SYSINFO, uintptr(unsafe.Pointer(info)), 0, 0)
 	if e1 != 0 {