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- // 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 (
- "bytes"
- "fmt"
- "io/ioutil"
- "os/exec"
- "path"
- "path/filepath"
- "runtime"
- "strconv"
- "syscall"
- "testing"
- "github.com/jacobsa/fuse/fuseops"
- "github.com/jacobsa/fuse/fuseutil"
- "github.com/jacobsa/fuse/samples"
- "github.com/jacobsa/fuse/samples/statfs"
- . "github.com/jacobsa/ogletest"
- )
- func TestStatFS(t *testing.T) { RunTests(t) }
- const fsName = "some_fs_name"
- const volumeName = "Some volume"
- ////////////////////////////////////////////////////////////////////////
- // Helpers
- ////////////////////////////////////////////////////////////////////////
- // Ask `df` for statistics about the file system's capacity and free space,
- // useful for checking that our reading of statfs(2) output matches the
- // system's. The output is not guaranteed to have resolution greater than 2^10
- // (1 KiB).
- func df(dir string) (capacity, used, available uint64, err error) {
- // Call df with a block size of 1024 and capture its output.
- cmd := exec.Command("df", dir)
- cmd.Env = []string{"BLOCKSIZE=1024"}
- output, err := cmd.CombinedOutput()
- if err != nil {
- return
- }
- // Scrape it.
- for _, line := range bytes.Split(output, []byte{'\n'}) {
- // Is this the line we're interested in?
- if !bytes.Contains(line, []byte(dir)) {
- continue
- }
- submatches := gDfOutputRegexp.FindSubmatch(line)
- if submatches == nil {
- err = fmt.Errorf("Unable to parse line: %q", line)
- return
- }
- capacity, err = strconv.ParseUint(string(submatches[1]), 10, 64)
- if err != nil {
- return
- }
- used, err = strconv.ParseUint(string(submatches[2]), 10, 64)
- if err != nil {
- return
- }
- available, err = strconv.ParseUint(string(submatches[3]), 10, 64)
- if err != nil {
- return
- }
- // Scale appropriately based on the BLOCKSIZE set above.
- capacity *= 1024
- used *= 1024
- available *= 1024
- return
- }
- err = fmt.Errorf("Unable to parse df output:\n%s", output)
- return
- }
- ////////////////////////////////////////////////////////////////////////
- // Boilerplate
- ////////////////////////////////////////////////////////////////////////
- type StatFSTest struct {
- samples.SampleTest
- fs statfs.FS
- // t.Dir, with symlinks resolved and redundant path components removed.
- canonicalDir string
- }
- var _ SetUpInterface = &StatFSTest{}
- var _ TearDownInterface = &StatFSTest{}
- func init() { RegisterTestSuite(&StatFSTest{}) }
- func (t *StatFSTest) SetUp(ti *TestInfo) {
- var err error
- // Writeback caching can ruin our measurement of the write sizes the kernel
- // decides to give us, since it causes write acking to race against writes
- // being issued from the client.
- t.MountConfig.DisableWritebackCaching = true
- // Configure names.
- t.MountConfig.FSName = fsName
- t.MountConfig.VolumeName = volumeName
- // Create the file system.
- t.fs = statfs.New()
- t.Server = fuseutil.NewFileSystemServer(t.fs)
- // Mount it.
- t.SampleTest.SetUp(ti)
- // Canonicalize the mount point.
- t.canonicalDir, err = filepath.EvalSymlinks(t.Dir)
- AssertEq(nil, err)
- t.canonicalDir = path.Clean(t.canonicalDir)
- }
- ////////////////////////////////////////////////////////////////////////
- // Tests
- ////////////////////////////////////////////////////////////////////////
- func (t *StatFSTest) CapacityAndFreeSpace() {
- canned := fuseops.StatFSOp{
- Blocks: 1024,
- BlocksFree: 896,
- BlocksAvailable: 768,
- IoSize: 1024, // Shouldn't matter.
- }
- // Check that df agrees with us about a range of block sizes.
- for log2BlockSize := uint(9); log2BlockSize <= 17; log2BlockSize++ {
- bs := uint64(1) << log2BlockSize
- desc := fmt.Sprintf("block size: %d (2^%d)", bs, log2BlockSize)
- // Set up the canned response.
- canned.BlockSize = uint32(bs)
- t.fs.SetStatFSResponse(canned)
- // Call df.
- capacity, used, available, err := df(t.canonicalDir)
- AssertEq(nil, err)
- ExpectEq(bs*canned.Blocks, capacity, "%s", desc)
- ExpectEq(bs*(canned.Blocks-canned.BlocksFree), used, "%s", desc)
- ExpectEq(bs*canned.BlocksAvailable, available, "%s", desc)
- }
- }
- func (t *StatFSTest) WriteSize() {
- var err error
- // Set up a smallish block size.
- canned := fuseops.StatFSOp{
- BlockSize: 8192,
- IoSize: 16384,
- Blocks: 1234,
- BlocksFree: 1234,
- BlocksAvailable: 1234,
- }
- t.fs.SetStatFSResponse(canned)
- // Cause a large amount of date to be written.
- err = ioutil.WriteFile(
- path.Join(t.Dir, "foo"),
- bytes.Repeat([]byte{'x'}, 1<<22),
- 0400)
- AssertEq(nil, err)
- // Despite the small block size, the OS shouldn't have given us pitifully
- // small chunks of data.
- switch runtime.GOOS {
- case "linux":
- ExpectEq(1<<17, t.fs.MostRecentWriteSize())
- case "darwin":
- ExpectEq(1<<20, t.fs.MostRecentWriteSize())
- default:
- AddFailure("Unhandled OS: %s", runtime.GOOS)
- }
- }
- func (t *StatFSTest) StatBlocks() {
- var err error
- var stat syscall.Stat_t
- const fileName = "foo"
- const size = 1 << 22
- err = ioutil.WriteFile(
- path.Join(t.Dir, fileName),
- bytes.Repeat([]byte{'x'}, size),
- 0400)
- AssertEq(nil, err)
- t.fs.SetStatResponse(fuseops.InodeAttributes{
- Size: size,
- })
- err = syscall.Stat(path.Join(t.Dir, fileName), &stat)
- AssertEq(nil, err)
- ExpectEq(size/512, stat.Blocks)
- }
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