1 files changed, 0 insertions, 247 deletions
diff --git a/pkg/sentry/fsimpl/proc/tasks.go b/pkg/sentry/fsimpl/proc/tasks.go
deleted file mode 100644
index d203cebd4..000000000
--- a/pkg/sentry/fsimpl/proc/tasks.go
+++ /dev/null
@@ -1,247 +0,0 @@
-// Copyright 2019 The gVisor Authors.
-//
-// 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 proc
-
-import (
-	"bytes"
-	"sort"
-	"strconv"
-
-	"gvisor.dev/gvisor/pkg/abi/linux"
-	"gvisor.dev/gvisor/pkg/context"
-	"gvisor.dev/gvisor/pkg/sentry/fsimpl/kernfs"
-	"gvisor.dev/gvisor/pkg/sentry/kernel"
-	"gvisor.dev/gvisor/pkg/sentry/kernel/auth"
-	"gvisor.dev/gvisor/pkg/sentry/vfs"
-	"gvisor.dev/gvisor/pkg/syserror"
-)
-
-const (
-	selfName       = "self"
-	threadSelfName = "thread-self"
-)
-
-// InoGenerator generates unique inode numbers for a given filesystem.
-type InoGenerator interface {
-	NextIno() uint64
-}
-
-// tasksInode represents the inode for /proc/ directory.
-//
-// +stateify savable
-type tasksInode struct {
-	kernfs.InodeNotSymlink
-	kernfs.InodeDirectoryNoNewChildren
-	kernfs.InodeAttrs
-	kernfs.OrderedChildren
-
-	inoGen InoGenerator
-	pidns  *kernel.PIDNamespace
-
-	// '/proc/self' and '/proc/thread-self' have custom directory offsets in
-	// Linux. So handle them outside of OrderedChildren.
-	selfSymlink       *vfs.Dentry
-	threadSelfSymlink *vfs.Dentry
-
-	// cgroupControllers is a map of controller name to directory in the
-	// cgroup hierarchy. These controllers are immutable and will be listed
-	// in /proc/pid/cgroup if not nil.
-	cgroupControllers map[string]string
-}
-
-var _ kernfs.Inode = (*tasksInode)(nil)
-
-func newTasksInode(inoGen InoGenerator, k *kernel.Kernel, pidns *kernel.PIDNamespace, cgroupControllers map[string]string) (*tasksInode, *kernfs.Dentry) {
-	root := auth.NewRootCredentials(pidns.UserNamespace())
-	contents := map[string]*kernfs.Dentry{
-		"cpuinfo": newDentry(root, inoGen.NextIno(), 0444, newStaticFile(cpuInfoData(k))),
-		//"filesystems": newDentry(root, inoGen.NextIno(), 0444, &filesystemsData{}),
-		"loadavg": newDentry(root, inoGen.NextIno(), 0444, &loadavgData{}),
-		"sys":     newSysDir(root, inoGen, k),
-		"meminfo": newDentry(root, inoGen.NextIno(), 0444, &meminfoData{}),
-		"mounts":  kernfs.NewStaticSymlink(root, inoGen.NextIno(), "self/mounts"),
-		"net":     kernfs.NewStaticSymlink(root, inoGen.NextIno(), "self/net"),
-		"stat":    newDentry(root, inoGen.NextIno(), 0444, &statData{k: k}),
-		"uptime":  newDentry(root, inoGen.NextIno(), 0444, &uptimeData{}),
-		"version": newDentry(root, inoGen.NextIno(), 0444, &versionData{k: k}),
-	}
-
-	inode := &tasksInode{
-		pidns:             pidns,
-		inoGen:            inoGen,
-		selfSymlink:       newSelfSymlink(root, inoGen.NextIno(), 0444, pidns).VFSDentry(),
-		threadSelfSymlink: newThreadSelfSymlink(root, inoGen.NextIno(), 0444, pidns).VFSDentry(),
-		cgroupControllers: cgroupControllers,
-	}
-	inode.InodeAttrs.Init(root, inoGen.NextIno(), linux.ModeDirectory|0555)
-
-	dentry := &kernfs.Dentry{}
-	dentry.Init(inode)
-
-	inode.OrderedChildren.Init(kernfs.OrderedChildrenOptions{})
-	links := inode.OrderedChildren.Populate(dentry, contents)
-	inode.IncLinks(links)
-
-	return inode, dentry
-}
-
-// Lookup implements kernfs.inodeDynamicLookup.
-func (i *tasksInode) Lookup(ctx context.Context, name string) (*vfs.Dentry, error) {
-	// Try to lookup a corresponding task.
-	tid, err := strconv.ParseUint(name, 10, 64)
-	if err != nil {
-		// If it failed to parse, check if it's one of the special handled files.
-		switch name {
-		case selfName:
-			return i.selfSymlink, nil
-		case threadSelfName:
-			return i.threadSelfSymlink, nil
-		}
-		return nil, syserror.ENOENT
-	}
-
-	task := i.pidns.TaskWithID(kernel.ThreadID(tid))
-	if task == nil {
-		return nil, syserror.ENOENT
-	}
-
-	taskDentry := newTaskInode(i.inoGen, task, i.pidns, true, i.cgroupControllers)
-	return taskDentry.VFSDentry(), nil
-}
-
-// Valid implements kernfs.inodeDynamicLookup.
-func (i *tasksInode) Valid(ctx context.Context) bool {
-	return true
-}
-
-// IterDirents implements kernfs.inodeDynamicLookup.
-func (i *tasksInode) IterDirents(ctx context.Context, cb vfs.IterDirentsCallback, offset, _ int64) (int64, error) {
-	// fs/proc/internal.h: #define FIRST_PROCESS_ENTRY 256
-	const FIRST_PROCESS_ENTRY = 256
-
-	// Use maxTaskID to shortcut searches that will result in 0 entries.
-	const maxTaskID = kernel.TasksLimit + 1
-	if offset >= maxTaskID {
-		return offset, nil
-	}
-
-	// According to Linux (fs/proc/base.c:proc_pid_readdir()), process directories
-	// start at offset FIRST_PROCESS_ENTRY with '/proc/self', followed by
-	// '/proc/thread-self' and then '/proc/[pid]'.
-	if offset < FIRST_PROCESS_ENTRY {
-		offset = FIRST_PROCESS_ENTRY
-	}
-
-	if offset == FIRST_PROCESS_ENTRY {
-		dirent := vfs.Dirent{
-			Name:    selfName,
-			Type:    linux.DT_LNK,
-			Ino:     i.inoGen.NextIno(),
-			NextOff: offset + 1,
-		}
-		if err := cb.Handle(dirent); err != nil {
-			return offset, err
-		}
-		offset++
-	}
-	if offset == FIRST_PROCESS_ENTRY+1 {
-		dirent := vfs.Dirent{
-			Name:    threadSelfName,
-			Type:    linux.DT_LNK,
-			Ino:     i.inoGen.NextIno(),
-			NextOff: offset + 1,
-		}
-		if err := cb.Handle(dirent); err != nil {
-			return offset, err
-		}
-		offset++
-	}
-
-	// Collect all tasks that TGIDs are greater than the offset specified. Per
-	// Linux we only include in directory listings if it's the leader. But for
-	// whatever crazy reason, you can still walk to the given node.
-	var tids []int
-	startTid := offset - FIRST_PROCESS_ENTRY - 2
-	for _, tg := range i.pidns.ThreadGroups() {
-		tid := i.pidns.IDOfThreadGroup(tg)
-		if int64(tid) < startTid {
-			continue
-		}
-		if leader := tg.Leader(); leader != nil {
-			tids = append(tids, int(tid))
-		}
-	}
-
-	if len(tids) == 0 {
-		return offset, nil
-	}
-
-	sort.Ints(tids)
-	for _, tid := range tids {
-		dirent := vfs.Dirent{
-			Name:    strconv.FormatUint(uint64(tid), 10),
-			Type:    linux.DT_DIR,
-			Ino:     i.inoGen.NextIno(),
-			NextOff: FIRST_PROCESS_ENTRY + 2 + int64(tid) + 1,
-		}
-		if err := cb.Handle(dirent); err != nil {
-			return offset, err
-		}
-		offset++
-	}
-	return maxTaskID, nil
-}
-
-// Open implements kernfs.Inode.
-func (i *tasksInode) Open(rp *vfs.ResolvingPath, vfsd *vfs.Dentry, opts vfs.OpenOptions) (*vfs.FileDescription, error) {
-	fd := &kernfs.GenericDirectoryFD{}
-	fd.Init(rp.Mount(), vfsd, &i.OrderedChildren, &opts)
-	return fd.VFSFileDescription(), nil
-}
-
-func (i *tasksInode) Stat(vsfs *vfs.Filesystem, opts vfs.StatOptions) (linux.Statx, error) {
-	stat, err := i.InodeAttrs.Stat(vsfs, opts)
-	if err != nil {
-		return linux.Statx{}, err
-	}
-
-	if opts.Mask&linux.STATX_NLINK != 0 {
-		// Add dynamic children to link count.
-		for _, tg := range i.pidns.ThreadGroups() {
-			if leader := tg.Leader(); leader != nil {
-				stat.Nlink++
-			}
-		}
-	}
-
-	return stat, nil
-}
-
-func cpuInfoData(k *kernel.Kernel) string {
-	features := k.FeatureSet()
-	if features == nil {
-		// Kernel is always initialized with a FeatureSet.
-		panic("cpuinfo read with nil FeatureSet")
-	}
-	var buf bytes.Buffer
-	for i, max := uint(0), k.ApplicationCores(); i < max; i++ {
-		features.WriteCPUInfoTo(i, &buf)
-	}
-	return buf.String()
-}
-
-func shmData(v uint64) dynamicInode {
-	return newStaticFile(strconv.FormatUint(v, 10))
-}