diff options
Diffstat (limited to 'pkg/sentry/fsimpl/proc/tasks.go')
| -rw-r--r-- | pkg/sentry/fsimpl/proc/tasks.go | 56 |
1 files changed, 28 insertions, 28 deletions
diff --git a/pkg/sentry/fsimpl/proc/tasks.go b/pkg/sentry/fsimpl/proc/tasks.go index d8f5dd509..3259c3732 100644 --- a/pkg/sentry/fsimpl/proc/tasks.go +++ b/pkg/sentry/fsimpl/proc/tasks.go @@ -38,10 +38,11 @@ const ( // +stateify savable type tasksInode struct { implStatFS - kernfs.AlwaysValid + kernfs.InodeAlwaysValid kernfs.InodeAttrs kernfs.InodeDirectoryNoNewChildren kernfs.InodeNotSymlink + kernfs.InodeTemporary // This holds no meaning as this inode can't be Looked up and is always valid. kernfs.OrderedChildren tasksInodeRefs @@ -52,8 +53,6 @@ type tasksInode struct { // '/proc/self' and '/proc/thread-self' have custom directory offsets in // Linux. So handle them outside of OrderedChildren. - selfSymlink *kernfs.Dentry - threadSelfSymlink *kernfs.Dentry // cgroupControllers is a map of controller name to directory in the // cgroup hierarchy. These controllers are immutable and will be listed @@ -63,52 +62,53 @@ type tasksInode struct { var _ kernfs.Inode = (*tasksInode)(nil) -func (fs *filesystem) newTasksInode(k *kernel.Kernel, pidns *kernel.PIDNamespace, cgroupControllers map[string]string) (*tasksInode, *kernfs.Dentry) { +func (fs *filesystem) newTasksInode(k *kernel.Kernel, pidns *kernel.PIDNamespace, cgroupControllers map[string]string) *tasksInode { root := auth.NewRootCredentials(pidns.UserNamespace()) - contents := map[string]*kernfs.Dentry{ - "cpuinfo": fs.newDentry(root, fs.NextIno(), 0444, newStaticFileSetStat(cpuInfoData(k))), - "filesystems": fs.newDentry(root, fs.NextIno(), 0444, &filesystemsData{}), - "loadavg": fs.newDentry(root, fs.NextIno(), 0444, &loadavgData{}), + contents := map[string]kernfs.Inode{ + "cpuinfo": fs.newInode(root, 0444, newStaticFileSetStat(cpuInfoData(k))), + "filesystems": fs.newInode(root, 0444, &filesystemsData{}), + "loadavg": fs.newInode(root, 0444, &loadavgData{}), "sys": fs.newSysDir(root, k), - "meminfo": fs.newDentry(root, fs.NextIno(), 0444, &meminfoData{}), + "meminfo": fs.newInode(root, 0444, &meminfoData{}), "mounts": kernfs.NewStaticSymlink(root, linux.UNNAMED_MAJOR, fs.devMinor, fs.NextIno(), "self/mounts"), "net": kernfs.NewStaticSymlink(root, linux.UNNAMED_MAJOR, fs.devMinor, fs.NextIno(), "self/net"), - "stat": fs.newDentry(root, fs.NextIno(), 0444, &statData{}), - "uptime": fs.newDentry(root, fs.NextIno(), 0444, &uptimeData{}), - "version": fs.newDentry(root, fs.NextIno(), 0444, &versionData{}), + "stat": fs.newInode(root, 0444, &statData{}), + "uptime": fs.newInode(root, 0444, &uptimeData{}), + "version": fs.newInode(root, 0444, &versionData{}), } inode := &tasksInode{ pidns: pidns, fs: fs, - selfSymlink: fs.newSelfSymlink(root, fs.NextIno(), pidns), - threadSelfSymlink: fs.newThreadSelfSymlink(root, fs.NextIno(), pidns), cgroupControllers: cgroupControllers, } inode.InodeAttrs.Init(root, linux.UNNAMED_MAJOR, fs.devMinor, fs.NextIno(), linux.ModeDirectory|0555) inode.EnableLeakCheck() - dentry := &kernfs.Dentry{} - dentry.Init(inode) - inode.OrderedChildren.Init(kernfs.OrderedChildrenOptions{}) - links := inode.OrderedChildren.Populate(dentry, contents) + links := inode.OrderedChildren.Populate(contents) inode.IncLinks(links) - return inode, dentry + return inode } -// Lookup implements kernfs.inodeDynamicLookup.Lookup. -func (i *tasksInode) Lookup(ctx context.Context, name string) (*kernfs.Dentry, error) { - // Try to lookup a corresponding task. +// Lookup implements kernfs.inodeDirectory.Lookup. +func (i *tasksInode) Lookup(ctx context.Context, name string) (kernfs.Inode, error) { + // Check if a static entry was looked up. + if d, err := i.OrderedChildren.Lookup(ctx, name); err == nil { + return d, nil + } + + // Not a static entry. Try to lookup a corresponding task. tid, err := strconv.ParseUint(name, 10, 64) if err != nil { + root := auth.NewRootCredentials(i.pidns.UserNamespace()) // If it failed to parse, check if it's one of the special handled files. switch name { case selfName: - return i.selfSymlink, nil + return i.newSelfSymlink(root), nil case threadSelfName: - return i.threadSelfSymlink, nil + return i.newThreadSelfSymlink(root), nil } return nil, syserror.ENOENT } @@ -118,10 +118,10 @@ func (i *tasksInode) Lookup(ctx context.Context, name string) (*kernfs.Dentry, e return nil, syserror.ENOENT } - return i.fs.newTaskInode(task, i.pidns, true, i.cgroupControllers), nil + return i.fs.newTaskInode(task, i.pidns, true, i.cgroupControllers) } -// IterDirents implements kernfs.inodeDynamicLookup.IterDirents. +// IterDirents implements kernfs.inodeDirectory.IterDirents. 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 @@ -229,8 +229,8 @@ func (i *tasksInode) Stat(ctx context.Context, vsfs *vfs.Filesystem, opts vfs.St } // DecRef implements kernfs.Inode.DecRef. -func (i *tasksInode) DecRef(context.Context) { - i.tasksInodeRefs.DecRef(i.Destroy) +func (i *tasksInode) DecRef(ctx context.Context) { + i.tasksInodeRefs.DecRef(func() { i.Destroy(ctx) }) } // staticFileSetStat implements a special static file that allows inode |