fuse/pathfs: inline xattr calls for gccgo.

fuse/pathfs/loopback_linux.go

@@ -32,7 +32,7 @@ func (fs *loopbackFileSystem) ListXAttr(name string, context *fuse.Context) ([]s
 }
 
 func (fs *loopbackFileSystem) RemoveXAttr(name string, attr string, context *fuse.Context) fuse.Status {
-	err := syscall.Removexattr(fs.GetPath(name), attr)
+	err := sysRemovexattr(fs.GetPath(name), attr)
 	return fuse.ToStatus(err)
 }
 

fuse/pathfs/syscall_linux.go

@@ -3,13 +3,16 @@ package pathfs
 import (
 	"bytes"
 	"syscall"
+	"unsafe"
 )
 
+var _zero uintptr
+
 func getXAttr(path string, attr string, dest []byte) (value []byte, err error) {
-	sz, err := syscall.Getxattr(path, attr, dest)
+	sz, err := sysGetxattr(path, attr, dest)
 	for sz > cap(dest) && err == nil {
 		dest = make([]byte, sz)
-		sz, err = syscall.Getxattr(path, attr, dest)
+		sz, err = sysGetxattr(path, attr, dest)
 	}
 
 	if err != nil {
@@ -21,14 +24,14 @@ func getXAttr(path string, attr string, dest []byte) (value []byte, err error) {
 
 func listXAttr(path string) (attributes []string, err error) {
 	dest := make([]byte, 0)
-	sz, err := syscall.Listxattr(path, dest)
+	sz, err := sysListxattr(path, dest)
 	if err != nil {
 		return nil, err
 	}
 
 	for sz > cap(dest) && err == nil {
 		dest = make([]byte, sz)
-		sz, err = syscall.Listxattr(path, dest)
+		sz, err = sysListxattr(path, dest)
 	}
 
 	// -1 to drop the final empty slice.
@@ -40,3 +43,68 @@ func listXAttr(path string) (attributes []string, err error) {
 	}
 	return attributes, err
 }
+
+// Below is cut & paste from std lib syscall, so gccgo 4.8.1 can
+// compile this too.
+func sysGetxattr(path string, attr string, dest []byte) (sz int, err error) {
+	var _p0 *byte
+	_p0, err = syscall.BytePtrFromString(path)
+	if err != nil {
+		return
+	}
+	var _p1 *byte
+	_p1, err = syscall.BytePtrFromString(attr)
+	if err != nil {
+		return
+	}
+	var _p2 unsafe.Pointer
+	if len(dest) > 0 {
+		_p2 = unsafe.Pointer(&dest[0])
+	} else {
+		_p2 = unsafe.Pointer(&_zero)
+	}
+	r0, _, e1 := syscall.Syscall6(syscall.SYS_GETXATTR, uintptr(unsafe.Pointer(_p0)), uintptr(unsafe.Pointer(_p1)), uintptr(_p2), uintptr(len(dest)), 0, 0)
+	sz = int(r0)
+	if e1 != 0 {
+		err = e1
+	}
+	return
+}
+
+func sysRemovexattr(path string, attr string) (err error) {
+	var _p0 *byte
+	_p0, err = syscall.BytePtrFromString(path)
+	if err != nil {
+		return
+	}
+	var _p1 *byte
+	_p1, err = syscall.BytePtrFromString(attr)
+	if err != nil {
+		return
+	}
+	_, _, e1 := syscall.Syscall(syscall.SYS_REMOVEXATTR, uintptr(unsafe.Pointer(_p0)), uintptr(unsafe.Pointer(_p1)), 0)
+	if e1 != 0 {
+		err = e1
+	}
+	return
+}
+
+func sysListxattr(path string, dest []byte) (sz int, err error) {
+	var _p0 *byte
+	_p0, err = syscall.BytePtrFromString(path)
+	if err != nil {
+		return
+	}
+	var _p1 unsafe.Pointer
+	if len(dest) > 0 {
+		_p1 = unsafe.Pointer(&dest[0])
+	} else {
+		_p1 = unsafe.Pointer(&_zero)
+	}
+	r0, _, e1 := syscall.Syscall(syscall.SYS_LISTXATTR, uintptr(unsafe.Pointer(_p0)), uintptr(_p1), uintptr(len(dest)))
+	sz = int(r0)
+	if e1 != 0 {
+		err = e1
+	}
+	return
+}