Copied darwin-specific tests as linux-specific ones.

samples/statfs/statfs_linux_test.go

+// Copyright 2015 Google Inc. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package statfs_test
+
+import (
+	"fmt"
+	"syscall"
+
+	"github.com/jacobsa/fuse/fuseops"
+	. "github.com/jacobsa/ogletest"
+)
+
+////////////////////////////////////////////////////////////////////////
+// Tests
+////////////////////////////////////////////////////////////////////////
+
+func (t *StatFSTest) Syscall_ZeroValues() {
+	var err error
+	var stat syscall.Statfs_t
+
+	// Call without configuring a canned response, meaning the OS will see the
+	// zero value for each field. The assertions below act as documentation for
+	// the OS's behavior in this case.
+	err = syscall.Statfs(t.Dir, &stat)
+	AssertEq(nil, err)
+
+	ExpectEq(4096, stat.Bsize)
+	ExpectEq(65536, stat.Frsize)
+	ExpectEq(0, stat.Blocks)
+	ExpectEq(0, stat.Bfree)
+	ExpectEq(0, stat.Bavail)
+	ExpectEq(0, stat.Files)
+	ExpectEq(0, stat.Ffree)
+}
+
+func (t *StatFSTest) Syscall_NonZeroValues() {
+	var err error
+	var stat syscall.Statfs_t
+
+	// Set up the canned response.
+	canned := fuseops.StatFSOp{
+		BlockSize: 1 << 15,
+
+		Blocks:          1<<51 + 3,
+		BlocksFree:      1<<43 + 5,
+		BlocksAvailable: 1<<41 + 7,
+
+		Inodes:     1<<59 + 11,
+		InodesFree: 1<<58 + 13,
+	}
+
+	t.fs.SetStatFSResponse(canned)
+
+	// Stat.
+	err = syscall.Statfs(t.Dir, &stat)
+	AssertEq(nil, err)
+
+	ExpectEq(canned.BlockSize, stat.Bsize)
+	ExpectEq(canned.BlockSize, stat.Frsize)
+	ExpectEq(canned.Blocks, stat.Blocks)
+	ExpectEq(canned.BlocksFree, stat.Bfree)
+	ExpectEq(canned.BlocksAvailable, stat.Bavail)
+	ExpectEq(canned.Inodes, stat.Files)
+	ExpectEq(canned.InodesFree, stat.Ffree)
+}
+
+func (t *StatFSTest) UnsupportedBlockSizes() {
+	var err error
+
+	// Test a bunch of block sizes that the OS doesn't support faithfully,
+	// checking what it transforms them too.
+	testCases := []struct {
+		fsBlockSize    uint32
+		expectedBsize  uint32
+		expectedFrsize uint32
+	}{
+		0:  {0, 4096, 65536},
+		1:  {1, 512, 512},
+		2:  {3, 512, 512},
+		3:  {511, 512, 512},
+		4:  {513, 1024, 1024},
+		5:  {1023, 1024, 1024},
+		6:  {4095, 4096, 4096},
+		7:  {1<<17 - 1, 1 << 17, 131072},
+		8:  {1<<17 + 1, 1 << 17, 1 << 18},
+		9:  {1<<18 + 1, 1 << 17, 1 << 19},
+		10: {1<<19 + 1, 1 << 17, 1 << 20},
+		11: {1<<20 + 1, 1 << 17, 1 << 20},
+		12: {1 << 21, 1 << 17, 1 << 20},
+		13: {1 << 30, 1 << 17, 1 << 20},
+	}
+
+	for i, tc := range testCases {
+		desc := fmt.Sprintf("Case %d: block size %d", i, tc.fsBlockSize)
+
+		// Set up.
+		canned := fuseops.StatFSOp{
+			BlockSize: tc.fsBlockSize,
+			Blocks:    10,
+		}
+
+		t.fs.SetStatFSResponse(canned)
+
+		// Check.
+		var stat syscall.Statfs_t
+		err = syscall.Statfs(t.Dir, &stat)
+		AssertEq(nil, err)
+
+		ExpectEq(tc.expectedBsize, stat.Bsize, "%s", desc)
+		ExpectEq(tc.expectedFrsize, stat.Frsize, "%s", desc)
+	}
+}