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Merge pull request #2256 from kolyshkin/mountinfo-alt 

Use faster mountinfo parser (part 1)
This commit is contained in:
Mrunal Patel 2020-03-27 11:36:51 -07:00 committed by GitHub
parent 75ff40cd28 dd7b34618f
commit 53ad1d5100
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GPG Key ID: 4AEE18F83AFDEB23
18 changed files with 553 additions and 177 deletions
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9
.travis.yml
View File

@ -1,25 +1,24 @@
dist: bionic
language: go
go:
- 1.12.x
- 1.14.x
- 1.13.x
- 1.x
- tip
matrix:
include:
- go: 1.x
- go: 1.13.x
name: "verify-dependencies"
script:
- make verify-dependencies
- go: 1.12.x
- go: 1.13.x
name: "cgroup-systemd"
env:
- RUNC_USE_SYSTEMD=1
script:
- make BUILDTAGS="${BUILDTAGS}" all
- sudo PATH="$PATH" make localintegration RUNC_USE_SYSTEMD=1
- go: 1.12.x
- go: 1.13.x
name: "cgroup-v2"
env:
- VIRTUALBOX_VERSION=6.0

2
Dockerfile
View File

@ -1,4 +1,4 @@
FROM golang:1.12-stretch
FROM golang:1.13-stretch
RUN dpkg --add-architecture armel \
&& dpkg --add-architecture armhf \

1
go.mod
View File

@ -11,6 +11,7 @@ require (
github.com/docker/go-units v0.3.3
github.com/godbus/dbus/v5 v5.0.3
github.com/golang/protobuf v1.0.0
github.com/moby/sys/mountinfo v0.1.0
github.com/mrunalp/fileutils v0.0.0-20171103030105-7d4729fb3618
github.com/opencontainers/runtime-spec v1.0.2-0.20190207185410-29686dbc5559
github.com/opencontainers/selinux v1.3.3

2
go.sum
View File

@ -18,6 +18,8 @@ github.com/golang/protobuf v1.0.0 h1:lsek0oXi8iFE9L+EXARyHIjU5rlWIhhTkjDz3vHhWWQ
github.com/golang/protobuf v1.0.0/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
github.com/konsorten/go-windows-terminal-sequences v1.0.1 h1:mweAR1A6xJ3oS2pRaGiHgQ4OO8tzTaLawm8vnODuwDk=
github.com/konsorten/go-windows-terminal-sequences v1.0.1/go.mod h1:T0+1ngSBFLxvqU3pZ+m/2kptfBszLMUkC4ZK/EgS/cQ=
github.com/moby/sys/mountinfo v0.1.0 h1:r8vMRbMAFEAfiNptYVokP+nfxPJzvRuia5e2vzXtENo=
github.com/moby/sys/mountinfo v0.1.0/go.mod h1:w2t2Avltqx8vE7gX5l+QiBKxODu2TX0+Syr3h52Tw4o=
github.com/mrunalp/fileutils v0.0.0-20171103030105-7d4729fb3618 h1:7InQ7/zrOh6SlFjaXFubv0xX0HsuC9qJsdqm7bNQpYM=
github.com/mrunalp/fileutils v0.0.0-20171103030105-7d4729fb3618/go.mod h1:x8F1gnqOkIEiO4rqoeEEEqQbo7HjGMTvyoq3gej4iT0=
github.com/opencontainers/runtime-spec v1.0.2-0.20190207185410-29686dbc5559 h1:Cef96rKLuXxeGzERI/0ve9yAzIeTpx0qz9JKFDZALYw=

6
libcontainer/factory_linux.go
View File

@ -11,7 +11,8 @@ import (
"runtime/debug"
"strconv"
"github.com/cyphar/filepath-securejoin"
securejoin "github.com/cyphar/filepath-securejoin"
"github.com/moby/sys/mountinfo"
"github.com/opencontainers/runc/libcontainer/cgroups"
"github.com/opencontainers/runc/libcontainer/cgroups/fs"
"github.com/opencontainers/runc/libcontainer/cgroups/fs2"
@ -19,7 +20,6 @@ import (
"github.com/opencontainers/runc/libcontainer/configs"
"github.com/opencontainers/runc/libcontainer/configs/validate"
"github.com/opencontainers/runc/libcontainer/intelrdt"
"github.com/opencontainers/runc/libcontainer/mount"
"github.com/opencontainers/runc/libcontainer/utils"
"github.com/pkg/errors"
@ -137,7 +137,7 @@ func IntelRdtFs(l *LinuxFactory) error {
// TmpfsRoot is an option func to mount LinuxFactory.Root to tmpfs.
func TmpfsRoot(l *LinuxFactory) error {
mounted, err := mount.Mounted(l.Root)
mounted, err := mountinfo.Mounted(l.Root)
if err != nil {
return err
}

29
libcontainer/factory_linux_test.go
View File

@ -9,8 +9,8 @@ import (
"reflect"
"testing"
"github.com/moby/sys/mountinfo"
"github.com/opencontainers/runc/libcontainer/configs"
"github.com/opencontainers/runc/libcontainer/mount"
"github.com/opencontainers/runc/libcontainer/utils"
"github.com/opencontainers/runtime-spec/specs-go"
@ -101,33 +101,28 @@ func TestFactoryNewTmpfs(t *testing.T) {
if factory.Type() != "libcontainer" {
t.Fatalf("unexpected factory type: %q, expected %q", factory.Type(), "libcontainer")
}
mounted, err := mount.Mounted(lfactory.Root)
mounted, err := mountinfo.Mounted(lfactory.Root)
if err != nil {
t.Fatal(err)
}
if !mounted {
t.Fatalf("Factory Root is not mounted")
}
mounts, err := mount.GetMounts()
mounts, err := mountinfo.GetMounts(mountinfo.SingleEntryFilter(lfactory.Root))
if err != nil {
t.Fatal(err)
}
var found bool
for _, m := range mounts {
if m.Mountpoint == lfactory.Root {
if m.Fstype != "tmpfs" {
t.Fatalf("Fstype of root: %s, expected %s", m.Fstype, "tmpfs")
}
if m.Source != "tmpfs" {
t.Fatalf("Source of root: %s, expected %s", m.Source, "tmpfs")
}
found = true
}
}
if !found {
if len(mounts) != 1 {
t.Fatalf("Factory Root is not listed in mounts list")
}
defer unix.Unmount(root, unix.MNT_DETACH)
m := mounts[0]
if m.Fstype != "tmpfs" {
t.Fatalf("Fstype of root: %s, expected %s", m.Fstype, "tmpfs")
}
if m.Source != "tmpfs" {
t.Fatalf("Source of root: %s, expected %s", m.Source, "tmpfs")
}
unix.Unmount(root, unix.MNT_DETACH)
}
func TestFactoryLoadNotExists(t *testing.T) {

23
libcontainer/mount/mount.go
View File

@ -1,23 +0,0 @@
package mount
// GetMounts retrieves a list of mounts for the current running process.
func GetMounts() ([]*Info, error) {
return parseMountTable()
}
// Mounted looks at /proc/self/mountinfo to determine of the specified
// mountpoint has been mounted
func Mounted(mountpoint string) (bool, error) {
entries, err := parseMountTable()
if err != nil {
return false, err
}
// Search the table for the mountpoint
for _, e := range entries {
if e.Mountpoint == mountpoint {
return true, nil
}
}
return false, nil
}

82
libcontainer/mount/mount_linux.go
View File

@ -1,82 +0,0 @@
// +build linux
package mount
import (
"bufio"
"fmt"
"io"
"os"
"strings"
)
const (
/* 36 35 98:0 /mnt1 /mnt2 rw,noatime master:1 - ext3 /dev/root rw,errors=continue
(1)(2)(3) (4) (5) (6) (7) (8) (9) (10) (11)
(1) mount ID: unique identifier of the mount (may be reused after umount)
(2) parent ID: ID of parent (or of self for the top of the mount tree)
(3) major:minor: value of st_dev for files on filesystem
(4) root: root of the mount within the filesystem
(5) mount point: mount point relative to the process's root
(6) mount options: per mount options
(7) optional fields: zero or more fields of the form "tag[:value]"
(8) separator: marks the end of the optional fields
(9) filesystem type: name of filesystem of the form "type[.subtype]"
(10) mount source: filesystem specific information or "none"
(11) super options: per super block options*/
mountinfoFormat = "%d %d %d:%d %s %s %s %s"
)
// Parse /proc/self/mountinfo because comparing Dev and ino does not work from
// bind mounts
func parseMountTable() ([]*Info, error) {
f, err := os.Open("/proc/self/mountinfo")
if err != nil {
return nil, err
}
defer f.Close()
return parseInfoFile(f)
}
func parseInfoFile(r io.Reader) ([]*Info, error) {
var (
s = bufio.NewScanner(r)
out = []*Info{}
)
for s.Scan() {
if err := s.Err(); err != nil {
return nil, err
}
var (
p = &Info{}
text = s.Text()
optionalFields string
)
if _, err := fmt.Sscanf(text, mountinfoFormat,
&p.ID, &p.Parent, &p.Major, &p.Minor,
&p.Root, &p.Mountpoint, &p.Opts, &optionalFields); err != nil {
return nil, fmt.Errorf("Scanning '%s' failed: %s", text, err)
}
// Safe as mountinfo encodes mountpoints with spaces as \040.
index := strings.Index(text, " - ")
postSeparatorFields := strings.Fields(text[index+3:])
if len(postSeparatorFields) < 3 {
return nil, fmt.Errorf("Error found less than 3 fields post '-' in %q", text)
}
if optionalFields != "-" {
p.Optional = optionalFields
}
p.Fstype = postSeparatorFields[0]
p.Source = postSeparatorFields[1]
p.VfsOpts = strings.Join(postSeparatorFields[2:], " ")
out = append(out, p)
}
return out, nil
}

67
libcontainer/rootfs_linux.go
View File

@ -14,10 +14,10 @@ import (
"time"
securejoin "github.com/cyphar/filepath-securejoin"
"github.com/moby/sys/mountinfo"
"github.com/mrunalp/fileutils"
"github.com/opencontainers/runc/libcontainer/cgroups"
"github.com/opencontainers/runc/libcontainer/configs"
"github.com/opencontainers/runc/libcontainer/mount"
"github.com/opencontainers/runc/libcontainer/system"
libcontainerUtils "github.com/opencontainers/runc/libcontainer/utils"
"github.com/opencontainers/selinux/go-selinux/label"
@ -661,46 +661,26 @@ func mknodDevice(dest string, node *configs.Device) error {
return unix.Chown(dest, int(node.Uid), int(node.Gid))
}
func getMountInfo(mountinfo []*mount.Info, dir string) *mount.Info {
for _, m := range mountinfo {
if m.Mountpoint == dir {
return m
}
}
return nil
}
// Get the parent mount point of directory passed in as argument. Also return
// optional fields.
func getParentMount(rootfs string) (string, string, error) {
var path string
mountinfos, err := mount.GetMounts()
mi, err := mountinfo.GetMounts(mountinfo.ParentsFilter(rootfs))
if err != nil {
return "", "", err
}
mountinfo := getMountInfo(mountinfos, rootfs)
if mountinfo != nil {
return rootfs, mountinfo.Optional, nil
if len(mi) < 1 {
return "", "", fmt.Errorf("could not find parent mount of %s", rootfs)
}
path = rootfs
for {
path = filepath.Dir(path)
mountinfo = getMountInfo(mountinfos, path)
if mountinfo != nil {
return path, mountinfo.Optional, nil
}
if path == "/" {
break
// find the longest mount point
var idx, maxlen int
for i := range mi {
if len(mi[i].Mountpoint) > maxlen {
maxlen = len(mi[i].Mountpoint)
idx = i
}
}
// If we are here, we did not find parent mount. Something is wrong.
return "", "", fmt.Errorf("Could not find parent mount of %s", rootfs)
return mi[idx].Mountpoint, mi[idx].Optional, nil
}
// Make parent mount private if it was shared
@ -825,25 +805,22 @@ func pivotRoot(rootfs string) error {
}
func msMoveRoot(rootfs string) error {
mountinfos, err := mount.GetMounts()
if err != nil {
return err
}
absRootfs, err := filepath.Abs(rootfs)
mountinfos, err := mountinfo.GetMounts(func(info *mountinfo.Info) (skip, stop bool) {
skip = false
stop = false
// Collect every sysfs and proc file systems, except those under the container rootfs
if (info.Fstype != "proc" && info.Fstype != "sysfs") || strings.HasPrefix(info.Mountpoint, rootfs) {
skip = true
return
}
return
})
if err != nil {
return err
}
for _, info := range mountinfos {
p, err := filepath.Abs(info.Mountpoint)
if err != nil {
return err
}
// Umount every syfs and proc file systems, except those under the container rootfs
if (info.Fstype != "proc" && info.Fstype != "sysfs") || filepath.HasPrefix(p, absRootfs) {
continue
}
p := info.Mountpoint
// Be sure umount events are not propagated to the host.
if err := unix.Mount("", p, "", unix.MS_SLAVE|unix.MS_REC, ""); err != nil {
return err

202
vendor/github.com/moby/sys/mountinfo/LICENSE generated vendored Normal file
View File

@ -0,0 +1,202 @@
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3
vendor/github.com/moby/sys/mountinfo/go.mod generated vendored Normal file
View File

@ -0,0 +1,3 @@
module github.com/moby/sys/mountinfo
go 1.14

19
libcontainer/mount/mountinfo.go → vendor/github.com/moby/sys/mountinfo/mountinfo.go generated vendored
View File

@ -1,4 +1,21 @@
package mount
package mountinfo
// GetMounts retrieves a list of mounts for the current running process,
// with an optional filter applied (use nil for no filter).
func GetMounts(f FilterFunc) ([]*Info, error) {
return parseMountTable(f)
}
// Mounted determines if a specified mountpoint has been mounted.
// On Linux it looks at /proc/self/mountinfo.
func Mounted(mountpoint string) (bool, error) {
entries, err := GetMounts(SingleEntryFilter(mountpoint))
if err != nil {
return false, err
}
return len(entries) > 0, nil
}
// Info reveals information about a particular mounted filesystem. This
// struct is populated from the content in the /proc/<pid>/mountinfo file.

56
vendor/github.com/moby/sys/mountinfo/mountinfo_filters.go generated vendored Normal file
View File

@ -0,0 +1,56 @@
package mountinfo
import "strings"
// FilterFunc is a type defining a callback function for GetMount(),
// used to filter out mountinfo entries we're not interested in.
//
// It takes a pointer to the Info struct (not fully populated,
// currently only Mountpoint is filled in), and returns two booleans:
//
// - skip: true if the entry should be skipped
// - stop: true if parsing should be stopped after the entry
type FilterFunc func(*Info) (skip, stop bool)
// PrefixFilter discards all entries whose mount points
// do not start with a specific prefix
func PrefixFilter(prefix string) FilterFunc {
return func(m *Info) (bool, bool) {
skip := !strings.HasPrefix(m.Mountpoint, prefix)
return skip, false
}
}
// SingleEntryFilter looks for a specific entry
func SingleEntryFilter(mp string) FilterFunc {
return func(m *Info) (bool, bool) {
if m.Mountpoint == mp {
return false, true // don't skip, stop now
}
return true, false // skip, keep going
}
}
// ParentsFilter returns all entries whose mount points
// can be parents of a path specified, discarding others.
//
// For example, given `/var/lib/docker/something`, entries
// like `/var/lib/docker`, `/var` and `/` are returned.
func ParentsFilter(path string) FilterFunc {
return func(m *Info) (bool, bool) {
skip := !strings.HasPrefix(path, m.Mountpoint)
return skip, false
}
}
// FstypeFilter returns all entries that match provided fstype(s).
func FstypeFilter(fstype ...string) FilterFunc {
return func(m *Info) (bool, bool) {
for _, t := range fstype {
if m.Fstype == t {
return false, false // don't skeep, keep going
}
}
return true, false // skip, keep going
}
}

54
vendor/github.com/moby/sys/mountinfo/mountinfo_freebsd.go generated vendored Normal file
View File

@ -0,0 +1,54 @@
package mountinfo
/*
#include <sys/param.h>
#include <sys/ucred.h>
#include <sys/mount.h>
*/
import "C"
import (
"fmt"
"reflect"
"unsafe"
)
// parseMountTable returns information about mounted filesystems
func parseMountTable(filter FilterFunc) ([]*Info, error) {
var rawEntries *C.struct_statfs
count := int(C.getmntinfo(&rawEntries, C.MNT_WAIT))
if count == 0 {
return nil, fmt.Errorf("Failed to call getmntinfo")
}
var entries []C.struct_statfs
header := (*reflect.SliceHeader)(unsafe.Pointer(&entries))
header.Cap = count
header.Len = count
header.Data = uintptr(unsafe.Pointer(rawEntries))
var out []*Info
for _, entry := range entries {
var mountinfo Info
var skip, stop bool
mountinfo.Mountpoint = C.GoString(&entry.f_mntonname[0])
mountinfo.Fstype = C.GoString(&entry.f_fstypename[0])
if filter != nil {
// filter out entries we're not interested in
skip, stop = filter(&mountinfo)
if skip {
continue
}
}
mountinfo.Source = C.GoString(&entry.f_mntfromname[0])
out = append(out, &mountinfo)
if stop {
break
}
}
return out, nil
}

154
vendor/github.com/moby/sys/mountinfo/mountinfo_linux.go generated vendored Normal file
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@ -0,0 +1,154 @@
// +build go1.13
package mountinfo
import (
"bufio"
"fmt"
"io"
"os"
"strconv"
"strings"
)
func parseInfoFile(r io.Reader, filter FilterFunc) ([]*Info, error) {
s := bufio.NewScanner(r)
out := []*Info{}
var err error
for s.Scan() {
if err = s.Err(); err != nil {
return nil, err
}
/*
See http://man7.org/linux/man-pages/man5/proc.5.html
36 35 98:0 /mnt1 /mnt2 rw,noatime master:1 - ext3 /dev/root rw,errors=continue
(1)(2)(3) (4) (5) (6) (7) (8) (9) (10) (11)
(1) mount ID: unique identifier of the mount (may be reused after umount)
(2) parent ID: ID of parent (or of self for the top of the mount tree)
(3) major:minor: value of st_dev for files on filesystem
(4) root: root of the mount within the filesystem
(5) mount point: mount point relative to the process's root
(6) mount options: per mount options
(7) optional fields: zero or more fields of the form "tag[:value]"
(8) separator: marks the end of the optional fields
(9) filesystem type: name of filesystem of the form "type[.subtype]"
(10) mount source: filesystem specific information or "none"
(11) super options: per super block options
In other words, we have:
* 6 mandatory fields (1)..(6)
* 0 or more optional fields (7)
* a separator field (8)
* 3 mandatory fields (9)..(11)
*/
text := s.Text()
fields := strings.Split(text, " ")
numFields := len(fields)
if numFields < 10 {
// should be at least 10 fields
return nil, fmt.Errorf("Parsing '%s' failed: not enough fields (%d)", text, numFields)
}
// separator field
sepIdx := numFields - 4
// In Linux <= 3.9 mounting a cifs with spaces in a share
// name (like "//srv/My Docs") _may_ end up having a space
// in the last field of mountinfo (like "unc=//serv/My Docs").
// Since kernel 3.10-rc1, cifs option "unc=" is ignored,
// so spaces should not appear.
//
// Check for a separator, and work around the spaces bug
for fields[sepIdx] != "-" {
sepIdx--
if sepIdx == 5 {
return nil, fmt.Errorf("Parsing '%s' failed: missing - separator", text)
}
}
p := &Info{}
// Fill in the fields that a filter might check
// (currently only Mountpoint and Fstype)
p.Mountpoint, err = strconv.Unquote(`"` + fields[4] + `"`)
if err != nil {
return nil, fmt.Errorf("Parsing '%s' failed: unable to unquote mount point field: %w", fields[4], err)
}
p.Fstype = fields[sepIdx+1]
// Run a filter soon so we can skip parsing/adding entries
// the caller is not interested in
var skip, stop bool
if filter != nil {
skip, stop = filter(p)
if skip {
continue
}
}
// Fill in the rest of the fields
// ignore any numbers parsing errors, as there should not be any
p.ID, _ = strconv.Atoi(fields[0])
p.Parent, _ = strconv.Atoi(fields[1])
mm := strings.Split(fields[2], ":")
if len(mm) != 2 {
return nil, fmt.Errorf("Parsing '%s' failed: unexpected minor:major pair %s", text, mm)
}
p.Major, _ = strconv.Atoi(mm[0])
p.Minor, _ = strconv.Atoi(mm[1])
p.Root, err = strconv.Unquote(`"` + fields[3] + `"`)
if err != nil {
return nil, fmt.Errorf("Parsing '%s' failed: unable to unquote root field: %w", fields[3], err)
}
p.Opts = fields[5]
// zero or more optional fields
switch {
case sepIdx == 6:
// zero, do nothing
case sepIdx == 7:
p.Optional = fields[6]
default:
p.Optional = strings.Join(fields[6:sepIdx-1], " ")
}
p.Source = fields[sepIdx+2]
p.VfsOpts = fields[sepIdx+3]
out = append(out, p)
if stop {
break
}
}
return out, nil
}
// Parse /proc/self/mountinfo because comparing Dev and ino does not work from
// bind mounts
func parseMountTable(filter FilterFunc) ([]*Info, error) {
f, err := os.Open("/proc/self/mountinfo")
if err != nil {
return nil, err
}
defer f.Close()
return parseInfoFile(f, filter)
}
// PidMountInfo collects the mounts for a specific process ID. If the process
// ID is unknown, it is better to use `GetMounts` which will inspect
// "/proc/self/mountinfo" instead.
func PidMountInfo(pid int) ([]*Info, error) {
f, err := os.Open(fmt.Sprintf("/proc/%d/mountinfo", pid))
if err != nil {
return nil, err
}
defer f.Close()
return parseInfoFile(f, nil)
}

12
vendor/github.com/moby/sys/mountinfo/mountinfo_unsupported.go generated vendored Normal file
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@ -0,0 +1,12 @@
// +build !windows,!linux,!freebsd freebsd,!cgo
package mountinfo
import (
"fmt"
"runtime"
)
func parseMountTable(f FilterFunc) ([]*Info, error) {
return nil, fmt.Errorf("mount.parseMountTable is not implemented on %s/%s", runtime.GOOS, runtime.GOARCH)
}

6
vendor/github.com/moby/sys/mountinfo/mountinfo_windows.go generated vendored Normal file
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@ -0,0 +1,6 @@
package mountinfo
func parseMountTable(f FilterFunc) ([]*Info, error) {
// Do NOT return an error!
return nil, nil
}

3
vendor/modules.txt vendored
View File

@ -28,6 +28,9 @@ github.com/godbus/dbus/v5
github.com/golang/protobuf/proto
# github.com/konsorten/go-windows-terminal-sequences v1.0.1
github.com/konsorten/go-windows-terminal-sequences
# github.com/moby/sys/mountinfo v0.1.0
## explicit
github.com/moby/sys/mountinfo
# github.com/mrunalp/fileutils v0.0.0-20171103030105-7d4729fb3618
## explicit
github.com/mrunalp/fileutils