syscallcompat: drop obsolete wrappers

These are now available cross-platform in the unix
package.

internal/fusefrontend/node.go

@@ -287,13 +287,13 @@ func (n *Node) Link(ctx context.Context, target fs.InodeEmbedder, name string, o
 			return
 		}
 		// Create "gocryptfs.longfile." link
-		err = syscallcompat.Linkat(dirfd2, cName2, dirfd, cName, 0)
+		err = unix.Linkat(dirfd2, cName2, dirfd, cName, 0)
 		if err != nil {
 			nametransform.DeleteLongNameAt(dirfd, cName)
 		}
 	} else {
 		// Create regular link
-		err = syscallcompat.Linkat(dirfd2, cName2, dirfd, cName, 0)
+		err = unix.Linkat(dirfd2, cName2, dirfd, cName, 0)
 	}
 	if err != nil {
 		errno = fs.ToErrno(err)

internal/syscallcompat/eintr.go

@@ -2,6 +2,8 @@ package syscallcompat
 
 import (
 	"syscall"
+
+	"golang.org/x/sys/unix"
 )
 
 // retryEINTR executes operation `op` and retries if it gets EINTR.
@@ -43,6 +45,24 @@ func Open(path string, mode int, perm uint32) (fd int, err error) {
 	return fd, err
 }
 
+// Renameat wraps the Renameat syscall.
+// Retries on EINTR.
+func Renameat(olddirfd int, oldpath string, newdirfd int, newpath string) (err error) {
+	err = retryEINTR(func() error {
+		return unix.Renameat(olddirfd, oldpath, newdirfd, newpath)
+	})
+	return err
+}
+
+// Unlinkat syscall.
+// Retries on EINTR.
+func Unlinkat(dirfd int, path string, flags int) (err error) {
+	err = retryEINTR(func() error {
+		return unix.Unlinkat(dirfd, path, flags)
+	})
+	return err
+}
+
 // Flush is a helper for the FUSE command FLUSH.
 // Retries on EINTR.
 func Flush(fd int) error {

internal/syscallcompat/sys_common.go

@@ -66,24 +66,6 @@ func Openat(dirfd int, path string, flags int, mode uint32) (fd int, err error)
 	return fd, err
 }
 
-// Renameat wraps the Renameat syscall.
-// Retries on EINTR.
-func Renameat(olddirfd int, oldpath string, newdirfd int, newpath string) (err error) {
-	err = retryEINTR(func() error {
-		return unix.Renameat(olddirfd, oldpath, newdirfd, newpath)
-	})
-	return err
-}
-
-// Unlinkat syscall.
-// Retries on EINTR.
-func Unlinkat(dirfd int, path string, flags int) (err error) {
-	err = retryEINTR(func() error {
-		return unix.Unlinkat(dirfd, path, flags)
-	})
-	return err
-}
-
 // Fchownat syscall.
 func Fchownat(dirfd int, path string, uid int, gid int, flags int) (err error) {
 	// Why would we ever want to call this without AT_SYMLINK_NOFOLLOW?
@@ -94,21 +76,6 @@ func Fchownat(dirfd int, path string, uid int, gid int, flags int) (err error) {
 	return unix.Fchownat(dirfd, path, uid, gid, flags)
 }
 
-// Linkat exists both in Linux and in MacOS 10.10+.
-func Linkat(olddirfd int, oldpath string, newdirfd int, newpath string, flags int) (err error) {
-	return unix.Linkat(olddirfd, oldpath, newdirfd, newpath, flags)
-}
-
-// Symlinkat syscall.
-func Symlinkat(oldpath string, newdirfd int, newpath string) (err error) {
-	return unix.Symlinkat(oldpath, newdirfd, newpath)
-}
-
-// Mkdirat syscall.
-func Mkdirat(dirfd int, path string, mode uint32) (err error) {
-	return unix.Mkdirat(dirfd, path, mode)
-}
-
 // Fstatat syscall.
 // Retries on EINTR.
 func Fstatat(dirfd int, path string, stat *unix.Stat_t, flags int) (err error) {

internal/syscallcompat/sys_common_test.go

@@ -230,8 +230,10 @@ func symlinkCheckMode(t *testing.T, st syscall.Stat_t) {
 	}
 }
 
+// We used to have our own wrapper for Symlinkat. The wrapper is gone but the test
+// is still useful.
 func TestSymlinkat(t *testing.T) {
-	err := Symlinkat("/foo/bar/baz", tmpDirFd, "symlink1")
+	err := unix.Symlinkat("/foo/bar/baz", tmpDirFd, "symlink1")
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -242,7 +244,7 @@ func TestSymlinkat(t *testing.T) {
 	}
 	symlinkCheckMode(t, st)
 	// Test with absolute path
-	err = Symlinkat("/foo/bar/baz", -1, tmpDir+"/symlink2")
+	err = unix.Symlinkat("/foo/bar/baz", -1, tmpDir+"/symlink2")
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -253,8 +255,10 @@ func TestSymlinkat(t *testing.T) {
 	symlinkCheckMode(t, st)
 }
 
+// We used to have our own wrapper for Mkdirat. The wrapper is gone but the test
+// is still useful.
 func TestMkdirat(t *testing.T) {
-	err := Mkdirat(tmpDirFd, "mkdirat", 0700)
+	err := unix.Mkdirat(tmpDirFd, "mkdirat", 0700)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -266,7 +270,7 @@ func TestMkdirat(t *testing.T) {
 		t.Fatalf("mkdirat did not create a directory")
 	}
 	// Test with absolute path
-	err = Mkdirat(-1, tmpDir+"/mkdirat2", 0700)
+	err = unix.Mkdirat(-1, tmpDir+"/mkdirat2", 0700)
 	if err != nil {
 		t.Fatal(err)
 	}

internal/syscallcompat/sys_darwin.go

@@ -131,7 +131,7 @@ func SymlinkatUser(oldpath string, newdirfd int, newpath string, context *fuse.C
 		defer pthread_setugid_np(KAUTH_UID_NONE, KAUTH_GID_NONE)
 	}
 
-	return Symlinkat(oldpath, newdirfd, newpath)
+	return unix.Symlinkat(oldpath, newdirfd, newpath)
 }
 
 func MkdiratUser(dirfd int, path string, mode uint32, context *fuse.Context) (err error) {
@@ -146,7 +146,7 @@ func MkdiratUser(dirfd int, path string, mode uint32, context *fuse.Context) (er
 		defer pthread_setugid_np(KAUTH_UID_NONE, KAUTH_GID_NONE)
 	}
 
-	return Mkdirat(dirfd, path, mode)
+	return unix.Mkdirat(dirfd, path, mode)
 }
 
 type attrList struct {

internal/syscallcompat/sys_linux.go

@@ -204,7 +204,7 @@ func FchmodatNofollow(dirfd int, path string, mode uint32) (err error) {
 // See OpenatUser() for how this works.
 func SymlinkatUser(oldpath string, newdirfd int, newpath string, context *fuse.Context) (err error) {
 	f := func() (int, error) {
-		err := Symlinkat(oldpath, newdirfd, newpath)
+		err := unix.Symlinkat(oldpath, newdirfd, newpath)
 		return -1, err
 	}
 	_, err = asUser(f, context)
@@ -217,7 +217,7 @@ func SymlinkatUser(oldpath string, newdirfd int, newpath string, context *fuse.C
 // See OpenatUser() for how this works.
 func MkdiratUser(dirfd int, path string, mode uint32, context *fuse.Context) (err error) {
 	f := func() (int, error) {
-		err := Mkdirat(dirfd, path, mode)
+		err := unix.Mkdirat(dirfd, path, mode)
 		return -1, err
 	}
 	_, err = asUser(f, context)