[vfs] kernfs: Implement remaining InodeAttr fields.

Added the following fields in kernfs.InodeAttr:
- blockSize
- atime
- mtime
- ctime

Also resolved all TODOs for #1193.

Fixes #1193

PiperOrigin-RevId: 338714527

27 files changed, 299 insertions, 262 deletions

diff --git a/pkg/sentry/fsimpl/devpts/devpts.go b/pkg/sentry/fsimpl/devpts/devpts.go
index d5c5aaa8c..9185877f6 100644
--- a/pkg/sentry/fsimpl/devpts/devpts.go
+++ b/pkg/sentry/fsimpl/devpts/devpts.go
@@ -60,7 +60,7 @@ func (fstype *FilesystemType) GetFilesystem(ctx context.Context, vfsObj *vfs.Vir
 	}
 
 	fstype.initOnce.Do(func() {
-		fs, root, err := fstype.newFilesystem(vfsObj, creds)
+		fs, root, err := fstype.newFilesystem(ctx, vfsObj, creds)
 		if err != nil {
 			fstype.initErr = err
 			return
@@ -93,7 +93,7 @@ type filesystem struct {
 
 // newFilesystem creates a new devpts filesystem with root directory and ptmx
 // master inode. It returns the filesystem and root Dentry.
-func (fstype *FilesystemType) newFilesystem(vfsObj *vfs.VirtualFilesystem, creds *auth.Credentials) (*filesystem, *kernfs.Dentry, error) {
+func (fstype *FilesystemType) newFilesystem(ctx context.Context, vfsObj *vfs.VirtualFilesystem, creds *auth.Credentials) (*filesystem, *kernfs.Dentry, error) {
 	devMinor, err := vfsObj.GetAnonBlockDevMinor()
 	if err != nil {
 		return nil, nil, err
@@ -108,7 +108,7 @@ func (fstype *FilesystemType) newFilesystem(vfsObj *vfs.VirtualFilesystem, creds
 	root := &rootInode{
 		replicas: make(map[uint32]*replicaInode),
 	}
-	root.InodeAttrs.Init(creds, linux.UNNAMED_MAJOR, devMinor, 1, linux.ModeDirectory|0555)
+	root.InodeAttrs.Init(ctx, creds, linux.UNNAMED_MAJOR, devMinor, 1, linux.ModeDirectory|0555)
 	root.OrderedChildren.Init(kernfs.OrderedChildrenOptions{})
 	root.EnableLeakCheck()
 
@@ -120,7 +120,7 @@ func (fstype *FilesystemType) newFilesystem(vfsObj *vfs.VirtualFilesystem, creds
 	master := &masterInode{
 		root: root,
 	}
-	master.InodeAttrs.Init(creds, linux.UNNAMED_MAJOR, devMinor, 2, linux.ModeCharacterDevice|0666)
+	master.InodeAttrs.Init(ctx, creds, linux.UNNAMED_MAJOR, devMinor, 2, linux.ModeCharacterDevice|0666)
 
 	// Add the master as a child of the root.
 	links := root.OrderedChildren.Populate(map[string]kernfs.Inode{
@@ -170,7 +170,7 @@ type rootInode struct {
 var _ kernfs.Inode = (*rootInode)(nil)
 
 // allocateTerminal creates a new Terminal and installs a pts node for it.
-func (i *rootInode) allocateTerminal(creds *auth.Credentials) (*Terminal, error) {
+func (i *rootInode) allocateTerminal(ctx context.Context, creds *auth.Credentials) (*Terminal, error) {
 	i.mu.Lock()
 	defer i.mu.Unlock()
 	if i.nextIdx == math.MaxUint32 {
@@ -192,7 +192,7 @@ func (i *rootInode) allocateTerminal(creds *auth.Credentials) (*Terminal, error)
 	}
 	// Linux always uses pty index + 3 as the inode id. See
 	// fs/devpts/inode.c:devpts_pty_new().
-	replica.InodeAttrs.Init(creds, i.InodeAttrs.DevMajor(), i.InodeAttrs.DevMinor(), uint64(idx+3), linux.ModeCharacterDevice|0600)
+	replica.InodeAttrs.Init(ctx, creds, i.InodeAttrs.DevMajor(), i.InodeAttrs.DevMinor(), uint64(idx+3), linux.ModeCharacterDevice|0600)
 	i.replicas[idx] = replica
 
 	return t, nil
@@ -248,9 +248,10 @@ func (i *rootInode) Lookup(ctx context.Context, name string) (kernfs.Inode, erro
 }
 
 // IterDirents implements kernfs.Inode.IterDirents.
-func (i *rootInode) IterDirents(ctx context.Context, cb vfs.IterDirentsCallback, offset, relOffset int64) (int64, error) {
+func (i *rootInode) IterDirents(ctx context.Context, mnt *vfs.Mount, cb vfs.IterDirentsCallback, offset, relOffset int64) (int64, error) {
 	i.mu.Lock()
 	defer i.mu.Unlock()
+	i.InodeAttrs.TouchAtime(ctx, mnt)
 	ids := make([]int, 0, len(i.replicas))
 	for id := range i.replicas {
 		ids = append(ids, int(id))
diff --git a/pkg/sentry/fsimpl/devpts/master.go b/pkg/sentry/fsimpl/devpts/master.go
index fda30fb93..e91fa26a4 100644
--- a/pkg/sentry/fsimpl/devpts/master.go
+++ b/pkg/sentry/fsimpl/devpts/master.go
@@ -50,7 +50,7 @@ var _ kernfs.Inode = (*masterInode)(nil)
 
 // Open implements kernfs.Inode.Open.
 func (mi *masterInode) Open(ctx context.Context, rp *vfs.ResolvingPath, d *kernfs.Dentry, opts vfs.OpenOptions) (*vfs.FileDescription, error) {
-	t, err := mi.root.allocateTerminal(rp.Credentials())
+	t, err := mi.root.allocateTerminal(ctx, rp.Credentials())
 	if err != nil {
 		return nil, err
 	}
diff --git a/pkg/sentry/fsimpl/fuse/fusefs.go b/pkg/sentry/fsimpl/fuse/fusefs.go
index e39df21c6..e7ef5998e 100644
--- a/pkg/sentry/fsimpl/fuse/fusefs.go
+++ b/pkg/sentry/fsimpl/fuse/fusefs.go
@@ -205,7 +205,7 @@ func (fsType FilesystemType) GetFilesystem(ctx context.Context, vfsObj *vfs.Virt
 	}
 
 	// root is the fusefs root directory.
-	root := fs.newRootInode(creds, fsopts.rootMode)
+	root := fs.newRootInode(ctx, creds, fsopts.rootMode)
 
 	return fs.VFSFilesystem(), root.VFSDentry(), nil
 }
@@ -284,9 +284,9 @@ type inode struct {
 	link string
 }
 
-func (fs *filesystem) newRootInode(creds *auth.Credentials, mode linux.FileMode) *kernfs.Dentry {
+func (fs *filesystem) newRootInode(ctx context.Context, creds *auth.Credentials, mode linux.FileMode) *kernfs.Dentry {
 	i := &inode{fs: fs, nodeID: 1}
-	i.InodeAttrs.Init(creds, linux.UNNAMED_MAJOR, fs.devMinor, 1, linux.ModeDirectory|0755)
+	i.InodeAttrs.Init(ctx, creds, linux.UNNAMED_MAJOR, fs.devMinor, 1, linux.ModeDirectory|0755)
 	i.OrderedChildren.Init(kernfs.OrderedChildrenOptions{})
 	i.EnableLeakCheck()
 
@@ -295,10 +295,10 @@ func (fs *filesystem) newRootInode(creds *auth.Credentials, mode linux.FileMode)
 	return &d
 }
 
-func (fs *filesystem) newInode(nodeID uint64, attr linux.FUSEAttr) kernfs.Inode {
+func (fs *filesystem) newInode(ctx context.Context, nodeID uint64, attr linux.FUSEAttr) kernfs.Inode {
 	i := &inode{fs: fs, nodeID: nodeID}
 	creds := auth.Credentials{EffectiveKGID: auth.KGID(attr.UID), EffectiveKUID: auth.KUID(attr.UID)}
-	i.InodeAttrs.Init(&creds, linux.UNNAMED_MAJOR, fs.devMinor, fs.NextIno(), linux.FileMode(attr.Mode))
+	i.InodeAttrs.Init(ctx, &creds, linux.UNNAMED_MAJOR, fs.devMinor, fs.NextIno(), linux.FileMode(attr.Mode))
 	atomic.StoreUint64(&i.size, attr.Size)
 	i.OrderedChildren.Init(kernfs.OrderedChildrenOptions{})
 	i.EnableLeakCheck()
@@ -424,7 +424,7 @@ func (i *inode) Keep() bool {
 }
 
 // IterDirents implements kernfs.Inode.IterDirents.
-func (*inode) IterDirents(ctx context.Context, callback vfs.IterDirentsCallback, offset, relOffset int64) (int64, error) {
+func (*inode) IterDirents(ctx context.Context, mnt *vfs.Mount, callback vfs.IterDirentsCallback, offset, relOffset int64) (int64, error) {
 	return offset, nil
 }
 
@@ -544,7 +544,7 @@ func (i *inode) newEntry(ctx context.Context, name string, fileType linux.FileMo
 	if opcode != linux.FUSE_LOOKUP && ((out.Attr.Mode&linux.S_IFMT)^uint32(fileType) != 0 || out.NodeID == 0 || out.NodeID == linux.FUSE_ROOT_ID) {
 		return nil, syserror.EIO
 	}
-	child := i.fs.newInode(out.NodeID, out.Attr)
+	child := i.fs.newInode(ctx, out.NodeID, out.Attr)
 	return child, nil
 }
 
@@ -696,7 +696,7 @@ func (i *inode) getAttr(ctx context.Context, fs *vfs.Filesystem, opts vfs.StatOp
 	}
 
 	// Set the metadata of kernfs.InodeAttrs.
-	if err := i.SetInodeStat(ctx, fs, creds, vfs.SetStatOptions{
+	if err := i.InodeAttrs.SetStat(ctx, fs, creds, vfs.SetStatOptions{
 		Stat: statFromFUSEAttr(out.Attr, linux.STATX_ALL, i.fs.devMinor),
 	}); err != nil {
 		return linux.FUSEAttr{}, err
@@ -812,7 +812,7 @@ func (i *inode) setAttr(ctx context.Context, fs *vfs.Filesystem, creds *auth.Cre
 	}
 
 	// Set the metadata of kernfs.InodeAttrs.
-	if err := i.SetInodeStat(ctx, fs, creds, vfs.SetStatOptions{
+	if err := i.InodeAttrs.SetStat(ctx, fs, creds, vfs.SetStatOptions{
 		Stat: statFromFUSEAttr(out.Attr, linux.STATX_ALL, i.fs.devMinor),
 	}); err != nil {
 		return err
diff --git a/pkg/sentry/fsimpl/fuse/read_write.go b/pkg/sentry/fsimpl/fuse/read_write.go
index 625d1547f..2d396e84c 100644
--- a/pkg/sentry/fsimpl/fuse/read_write.go
+++ b/pkg/sentry/fsimpl/fuse/read_write.go
@@ -132,7 +132,7 @@ func (fs *filesystem) ReadCallback(ctx context.Context, fd *regularFileFD, off u
 	// May need to update the signature.
 
 	i := fd.inode()
-	// TODO(gvisor.dev/issue/1193): Invalidate or update atime.
+	i.InodeAttrs.TouchAtime(ctx, fd.vfsfd.Mount())
 
 	// Reached EOF.
 	if sizeRead < size {
@@ -179,6 +179,7 @@ func (fs *filesystem) Write(ctx context.Context, fd *regularFileFD, off uint64,
 		Flags:      fd.statusFlags(),
 	}
 
+	inode := fd.inode()
 	var written uint32
 
 	// This loop is intended for fragmented write where the bytes to write is
@@ -203,7 +204,7 @@ func (fs *filesystem) Write(ctx context.Context, fd *regularFileFD, off uint64,
 		in.Offset = off + uint64(written)
 		in.Size = toWrite
 
-		req, err := fs.conn.NewRequest(auth.CredentialsFromContext(ctx), uint32(t.ThreadID()), fd.inode().nodeID, linux.FUSE_WRITE, &in)
+		req, err := fs.conn.NewRequest(auth.CredentialsFromContext(ctx), uint32(t.ThreadID()), inode.nodeID, linux.FUSE_WRITE, &in)
 		if err != nil {
 			return 0, err
 		}
@@ -237,6 +238,7 @@ func (fs *filesystem) Write(ctx context.Context, fd *regularFileFD, off uint64,
 			break
 		}
 	}
+	inode.InodeAttrs.TouchCMtime(ctx)
 
 	return written, nil
 }
diff --git a/pkg/sentry/fsimpl/gofer/gofer.go b/pkg/sentry/fsimpl/gofer/gofer.go
index f1dad1b08..8e179539c 100644
--- a/pkg/sentry/fsimpl/gofer/gofer.go
+++ b/pkg/sentry/fsimpl/gofer/gofer.go
@@ -916,10 +916,10 @@ func (d *dentry) statTo(stat *linux.Statx) {
 	// This is consistent with regularFileFD.Seek(), which treats regular files
 	// as having no holes.
 	stat.Blocks = (stat.Size + 511) / 512
-	stat.Atime = statxTimestampFromDentry(atomic.LoadInt64(&d.atime))
-	stat.Btime = statxTimestampFromDentry(atomic.LoadInt64(&d.btime))
-	stat.Ctime = statxTimestampFromDentry(atomic.LoadInt64(&d.ctime))
-	stat.Mtime = statxTimestampFromDentry(atomic.LoadInt64(&d.mtime))
+	stat.Atime = linux.NsecToStatxTimestamp(atomic.LoadInt64(&d.atime))
+	stat.Btime = linux.NsecToStatxTimestamp(atomic.LoadInt64(&d.btime))
+	stat.Ctime = linux.NsecToStatxTimestamp(atomic.LoadInt64(&d.ctime))
+	stat.Mtime = linux.NsecToStatxTimestamp(atomic.LoadInt64(&d.mtime))
 	stat.DevMajor = linux.UNNAMED_MAJOR
 	stat.DevMinor = d.fs.devMinor
 }
@@ -967,10 +967,10 @@ func (d *dentry) setStat(ctx context.Context, creds *auth.Credentials, opts *vfs
 		// Use client clocks for timestamps.
 		now = d.fs.clock.Now().Nanoseconds()
 		if stat.Mask&linux.STATX_ATIME != 0 && stat.Atime.Nsec == linux.UTIME_NOW {
-			stat.Atime = statxTimestampFromDentry(now)
+			stat.Atime = linux.NsecToStatxTimestamp(now)
 		}
 		if stat.Mask&linux.STATX_MTIME != 0 && stat.Mtime.Nsec == linux.UTIME_NOW {
-			stat.Mtime = statxTimestampFromDentry(now)
+			stat.Mtime = linux.NsecToStatxTimestamp(now)
 		}
 	}
 
@@ -1029,11 +1029,11 @@ func (d *dentry) setStat(ctx context.Context, creds *auth.Credentials, opts *vfs
 	// !d.cachedMetadataAuthoritative() then we returned after calling
 	// d.file.setAttr(). For the same reason, now must have been initialized.
 	if stat.Mask&linux.STATX_ATIME != 0 {
-		atomic.StoreInt64(&d.atime, dentryTimestampFromStatx(stat.Atime))
+		atomic.StoreInt64(&d.atime, stat.Atime.ToNsec())
 		atomic.StoreUint32(&d.atimeDirty, 0)
 	}
 	if stat.Mask&linux.STATX_MTIME != 0 {
-		atomic.StoreInt64(&d.mtime, dentryTimestampFromStatx(stat.Mtime))
+		atomic.StoreInt64(&d.mtime, stat.Mtime.ToNsec())
 		atomic.StoreUint32(&d.mtimeDirty, 0)
 	}
 	atomic.StoreInt64(&d.ctime, now)
diff --git a/pkg/sentry/fsimpl/gofer/time.go b/pkg/sentry/fsimpl/gofer/time.go
index 7e825caae..9cbe805b9 100644
--- a/pkg/sentry/fsimpl/gofer/time.go
+++ b/pkg/sentry/fsimpl/gofer/time.go
@@ -17,7 +17,6 @@ package gofer
 import (
 	"sync/atomic"
 
-	"gvisor.dev/gvisor/pkg/abi/linux"
 	"gvisor.dev/gvisor/pkg/sentry/vfs"
 )
 
@@ -25,17 +24,6 @@ func dentryTimestampFromP9(s, ns uint64) int64 {
 	return int64(s*1e9 + ns)
 }
 
-func dentryTimestampFromStatx(ts linux.StatxTimestamp) int64 {
-	return ts.Sec*1e9 + int64(ts.Nsec)
-}
-
-func statxTimestampFromDentry(ns int64) linux.StatxTimestamp {
-	return linux.StatxTimestamp{
-		Sec:  ns / 1e9,
-		Nsec: uint32(ns % 1e9),
-	}
-}
-
 // Preconditions: d.cachedMetadataAuthoritative() == true.
 func (d *dentry) touchAtime(mnt *vfs.Mount) {
 	if mnt.Flags.NoATime || mnt.ReadOnly() {
diff --git a/pkg/sentry/fsimpl/kernfs/BUILD b/pkg/sentry/fsimpl/kernfs/BUILD
index dbb70a875..4de1e6922 100644
--- a/pkg/sentry/fsimpl/kernfs/BUILD
+++ b/pkg/sentry/fsimpl/kernfs/BUILD
@@ -107,6 +107,7 @@ go_library(
         "//pkg/refsvfs2",
         "//pkg/sentry/fs/lock",
         "//pkg/sentry/kernel/auth",
+        "//pkg/sentry/kernel/time",
         "//pkg/sentry/memmap",
         "//pkg/sentry/socket/unix/transport",
         "//pkg/sentry/vfs",
diff --git a/pkg/sentry/fsimpl/kernfs/dynamic_bytes_file.go b/pkg/sentry/fsimpl/kernfs/dynamic_bytes_file.go
index b929118b1..485504995 100644
--- a/pkg/sentry/fsimpl/kernfs/dynamic_bytes_file.go
+++ b/pkg/sentry/fsimpl/kernfs/dynamic_bytes_file.go
@@ -47,11 +47,11 @@ type DynamicBytesFile struct {
 var _ Inode = (*DynamicBytesFile)(nil)
 
 // Init initializes a dynamic bytes file.
-func (f *DynamicBytesFile) Init(creds *auth.Credentials, devMajor, devMinor uint32, ino uint64, data vfs.DynamicBytesSource, perm linux.FileMode) {
+func (f *DynamicBytesFile) Init(ctx context.Context, creds *auth.Credentials, devMajor, devMinor uint32, ino uint64, data vfs.DynamicBytesSource, perm linux.FileMode) {
 	if perm&^linux.PermissionsMask != 0 {
 		panic(fmt.Sprintf("Only permission mask must be set: %x", perm&linux.PermissionsMask))
 	}
-	f.InodeAttrs.Init(creds, devMajor, devMinor, ino, linux.ModeRegular|perm)
+	f.InodeAttrs.Init(ctx, creds, devMajor, devMinor, ino, linux.ModeRegular|perm)
 	f.data = data
 }
 
diff --git a/pkg/sentry/fsimpl/kernfs/fd_impl_util.go b/pkg/sentry/fsimpl/kernfs/fd_impl_util.go
index abf1905d6..38503c90d 100644
--- a/pkg/sentry/fsimpl/kernfs/fd_impl_util.go
+++ b/pkg/sentry/fsimpl/kernfs/fd_impl_util.go
@@ -219,7 +219,7 @@ func (fd *GenericDirectoryFD) IterDirents(ctx context.Context, cb vfs.IterDirent
 
 	var err error
 	relOffset := fd.off - int64(len(fd.children.set)) - 2
-	fd.off, err = fd.inode().IterDirents(ctx, cb, fd.off, relOffset)
+	fd.off, err = fd.inode().IterDirents(ctx, fd.vfsfd.Mount(), cb, fd.off, relOffset)
 	return err
 }
 
diff --git a/pkg/sentry/fsimpl/kernfs/filesystem.go b/pkg/sentry/fsimpl/kernfs/filesystem.go
index 6426a55f6..399895f3e 100644
--- a/pkg/sentry/fsimpl/kernfs/filesystem.go
+++ b/pkg/sentry/fsimpl/kernfs/filesystem.go
@@ -373,7 +373,7 @@ func (fs *Filesystem) MkdirAt(ctx context.Context, rp *vfs.ResolvingPath, opts v
 		if !opts.ForSyntheticMountpoint || err == syserror.EEXIST {
 			return err
 		}
-		childI = newSyntheticDirectory(rp.Credentials(), opts.Mode)
+		childI = newSyntheticDirectory(ctx, rp.Credentials(), opts.Mode)
 	}
 	var child Dentry
 	child.Init(fs, childI)
@@ -517,9 +517,6 @@ afterTrailingSymlink:
 		}
 		var child Dentry
 		child.Init(fs, childI)
-		// FIXME(gvisor.dev/issue/1193): Race between checking existence with
-		// fs.stepExistingLocked and parent.insertChild. If possible, we should hold
-		// dirMu from one to the other.
 		parent.insertChild(pc, &child)
 		// Open may block so we need to unlock fs.mu. IncRef child to prevent
 		// its destruction while fs.mu is unlocked.
diff --git a/pkg/sentry/fsimpl/kernfs/inode_impl_util.go b/pkg/sentry/fsimpl/kernfs/inode_impl_util.go
index 122b10591..d9d76758a 100644
--- a/pkg/sentry/fsimpl/kernfs/inode_impl_util.go
+++ b/pkg/sentry/fsimpl/kernfs/inode_impl_util.go
@@ -21,9 +21,11 @@ import (
 	"gvisor.dev/gvisor/pkg/abi/linux"
 	"gvisor.dev/gvisor/pkg/context"
 	"gvisor.dev/gvisor/pkg/sentry/kernel/auth"
+	ktime "gvisor.dev/gvisor/pkg/sentry/kernel/time"
 	"gvisor.dev/gvisor/pkg/sentry/vfs"
 	"gvisor.dev/gvisor/pkg/sync"
 	"gvisor.dev/gvisor/pkg/syserror"
+	"gvisor.dev/gvisor/pkg/usermem"
 )
 
 // InodeNoopRefCount partially implements the Inode interface, specifically the
@@ -143,7 +145,7 @@ func (InodeNotDirectory) Lookup(ctx context.Context, name string) (Inode, error)
 }
 
 // IterDirents implements Inode.IterDirents.
-func (InodeNotDirectory) IterDirents(ctx context.Context, callback vfs.IterDirentsCallback, offset, relOffset int64) (newOffset int64, err error) {
+func (InodeNotDirectory) IterDirents(ctx context.Context, mnt *vfs.Mount, callback vfs.IterDirentsCallback, offset, relOffset int64) (newOffset int64, err error) {
 	panic("IterDirents called on non-directory inode")
 }
 
@@ -172,17 +174,23 @@ func (InodeNotSymlink) Getlink(context.Context, *vfs.Mount) (vfs.VirtualDentry,
 //
 // +stateify savable
 type InodeAttrs struct {
-	devMajor uint32
-	devMinor uint32
-	ino      uint64
-	mode     uint32
-	uid      uint32
-	gid      uint32
-	nlink    uint32
+	devMajor  uint32
+	devMinor  uint32
+	ino       uint64
+	mode      uint32
+	uid       uint32
+	gid       uint32
+	nlink     uint32
+	blockSize uint32
+
+	// Timestamps, all nsecs from the Unix epoch.
+	atime int64
+	mtime int64
+	ctime int64
 }
 
 // Init initializes this InodeAttrs.
-func (a *InodeAttrs) Init(creds *auth.Credentials, devMajor, devMinor uint32, ino uint64, mode linux.FileMode) {
+func (a *InodeAttrs) Init(ctx context.Context, creds *auth.Credentials, devMajor, devMinor uint32, ino uint64, mode linux.FileMode) {
 	if mode.FileType() == 0 {
 		panic(fmt.Sprintf("No file type specified in 'mode' for InodeAttrs.Init(): mode=0%o", mode))
 	}
@@ -198,6 +206,11 @@ func (a *InodeAttrs) Init(creds *auth.Credentials, devMajor, devMinor uint32, in
 	atomic.StoreUint32(&a.uid, uint32(creds.EffectiveKUID))
 	atomic.StoreUint32(&a.gid, uint32(creds.EffectiveKGID))
 	atomic.StoreUint32(&a.nlink, nlink)
+	atomic.StoreUint32(&a.blockSize, usermem.PageSize)
+	now := ktime.NowFromContext(ctx).Nanoseconds()
+	atomic.StoreInt64(&a.atime, now)
+	atomic.StoreInt64(&a.mtime, now)
+	atomic.StoreInt64(&a.ctime, now)
 }
 
 // DevMajor returns the device major number.
@@ -220,12 +233,33 @@ func (a *InodeAttrs) Mode() linux.FileMode {
 	return linux.FileMode(atomic.LoadUint32(&a.mode))
 }
 
+// TouchAtime updates a.atime to the current time.
+func (a *InodeAttrs) TouchAtime(ctx context.Context, mnt *vfs.Mount) {
+	if mnt.Flags.NoATime || mnt.ReadOnly() {
+		return
+	}
+	if err := mnt.CheckBeginWrite(); err != nil {
+		return
+	}
+	atomic.StoreInt64(&a.atime, ktime.NowFromContext(ctx).Nanoseconds())
+	mnt.EndWrite()
+}
+
+// TouchCMtime updates a.{c/m}time to the current time. The caller should
+// synchronize calls to this so that ctime and mtime are updated to the same
+// value.
+func (a *InodeAttrs) TouchCMtime(ctx context.Context) {
+	now := ktime.NowFromContext(ctx).Nanoseconds()
+	atomic.StoreInt64(&a.mtime, now)
+	atomic.StoreInt64(&a.ctime, now)
+}
+
 // Stat partially implements Inode.Stat. Note that this function doesn't provide
 // all the stat fields, and the embedder should consider extending the result
 // with filesystem-specific fields.
 func (a *InodeAttrs) Stat(context.Context, *vfs.Filesystem, vfs.StatOptions) (linux.Statx, error) {
 	var stat linux.Statx
-	stat.Mask = linux.STATX_TYPE | linux.STATX_MODE | linux.STATX_UID | linux.STATX_GID | linux.STATX_INO | linux.STATX_NLINK
+	stat.Mask = linux.STATX_TYPE | linux.STATX_MODE | linux.STATX_UID | linux.STATX_GID | linux.STATX_INO | linux.STATX_NLINK | linux.STATX_ATIME | linux.STATX_MTIME | linux.STATX_CTIME
 	stat.DevMajor = a.devMajor
 	stat.DevMinor = a.devMinor
 	stat.Ino = atomic.LoadUint64(&a.ino)
@@ -233,21 +267,15 @@ func (a *InodeAttrs) Stat(context.Context, *vfs.Filesystem, vfs.StatOptions) (li
 	stat.UID = atomic.LoadUint32(&a.uid)
 	stat.GID = atomic.LoadUint32(&a.gid)
 	stat.Nlink = atomic.LoadUint32(&a.nlink)
-
-	// TODO(gvisor.dev/issue/1193): Implement other stat fields like timestamps.
-
+	stat.Blksize = atomic.LoadUint32(&a.blockSize)
+	stat.Atime = linux.NsecToStatxTimestamp(atomic.LoadInt64(&a.atime))
+	stat.Mtime = linux.NsecToStatxTimestamp(atomic.LoadInt64(&a.mtime))
+	stat.Ctime = linux.NsecToStatxTimestamp(atomic.LoadInt64(&a.ctime))
 	return stat, nil
 }
 
 // SetStat implements Inode.SetStat.
 func (a *InodeAttrs) SetStat(ctx context.Context, fs *vfs.Filesystem, creds *auth.Credentials, opts vfs.SetStatOptions) error {
-	return a.SetInodeStat(ctx, fs, creds, opts)
-}
-
-// SetInodeStat sets the corresponding attributes from opts to InodeAttrs.
-// This function can be used by other kernfs-based filesystem implementation to
-// sets the unexported attributes into InodeAttrs.
-func (a *InodeAttrs) SetInodeStat(ctx context.Context, fs *vfs.Filesystem, creds *auth.Credentials, opts vfs.SetStatOptions) error {
 	if opts.Stat.Mask == 0 {
 		return nil
 	}
@@ -256,9 +284,7 @@ func (a *InodeAttrs) SetInodeStat(ctx context.Context, fs *vfs.Filesystem, creds
 	// inode numbers are immutable after node creation. Setting the size is often
 	// allowed by kernfs files but does not do anything. If some other behavior is
 	// needed, the embedder should consider extending SetStat.
-	//
-	// TODO(gvisor.dev/issue/1193): Implement other stat fields like timestamps.
-	if opts.Stat.Mask&^(linux.STATX_MODE|linux.STATX_UID|linux.STATX_GID|linux.STATX_SIZE) != 0 {
+	if opts.Stat.Mask&^(linux.STATX_MODE|linux.STATX_UID|linux.STATX_GID|linux.STATX_ATIME|linux.STATX_MTIME|linux.STATX_SIZE) != 0 {
 		return syserror.EPERM
 	}
 	if opts.Stat.Mask&linux.STATX_SIZE != 0 && a.Mode().IsDir() {
@@ -286,6 +312,20 @@ func (a *InodeAttrs) SetInodeStat(ctx context.Context, fs *vfs.Filesystem, creds
 		atomic.StoreUint32(&a.gid, stat.GID)
 	}
 
+	now := ktime.NowFromContext(ctx).Nanoseconds()
+	if stat.Mask&linux.STATX_ATIME != 0 {
+		if stat.Atime.Nsec == linux.UTIME_NOW {
+			stat.Atime = linux.NsecToStatxTimestamp(now)
+		}
+		atomic.StoreInt64(&a.atime, stat.Atime.ToNsec())
+	}
+	if stat.Mask&linux.STATX_MTIME != 0 {
+		if stat.Mtime.Nsec == linux.UTIME_NOW {
+			stat.Mtime = linux.NsecToStatxTimestamp(now)
+		}
+		atomic.StoreInt64(&a.mtime, stat.Mtime.ToNsec())
+	}
+
 	return nil
 }
 
@@ -421,7 +461,7 @@ func (o *OrderedChildren) Lookup(ctx context.Context, name string) (Inode, error
 }
 
 // IterDirents implements Inode.IterDirents.
-func (o *OrderedChildren) IterDirents(ctx context.Context, cb vfs.IterDirentsCallback, offset, relOffset int64) (newOffset int64, err error) {
+func (o *OrderedChildren) IterDirents(ctx context.Context, mnt *vfs.Mount, cb vfs.IterDirentsCallback, offset, relOffset int64) (newOffset int64, err error) {
 	// All entries from OrderedChildren have already been handled in
 	// GenericDirectoryFD.IterDirents.
 	return offset, nil
@@ -619,9 +659,9 @@ type StaticDirectory struct {
 var _ Inode = (*StaticDirectory)(nil)
 
 // NewStaticDir creates a new static directory and returns its dentry.
-func NewStaticDir(creds *auth.Credentials, devMajor, devMinor uint32, ino uint64, perm linux.FileMode, children map[string]Inode, fdOpts GenericDirectoryFDOptions) Inode {
+func NewStaticDir(ctx context.Context, creds *auth.Credentials, devMajor, devMinor uint32, ino uint64, perm linux.FileMode, children map[string]Inode, fdOpts GenericDirectoryFDOptions) Inode {
 	inode := &StaticDirectory{}
-	inode.Init(creds, devMajor, devMinor, ino, perm, fdOpts)
+	inode.Init(ctx, creds, devMajor, devMinor, ino, perm, fdOpts)
 	inode.EnableLeakCheck()
 
 	inode.OrderedChildren.Init(OrderedChildrenOptions{})
@@ -632,12 +672,12 @@ func NewStaticDir(creds *auth.Credentials, devMajor, devMinor uint32, ino uint64
 }
 
 // Init initializes StaticDirectory.
-func (s *StaticDirectory) Init(creds *auth.Credentials, devMajor, devMinor uint32, ino uint64, perm linux.FileMode, fdOpts GenericDirectoryFDOptions) {
+func (s *StaticDirectory) Init(ctx context.Context, creds *auth.Credentials, devMajor, devMinor uint32, ino uint64, perm linux.FileMode, fdOpts GenericDirectoryFDOptions) {
 	if perm&^linux.PermissionsMask != 0 {
 		panic(fmt.Sprintf("Only permission mask must be set: %x", perm&linux.PermissionsMask))
 	}
 	s.fdOpts = fdOpts
-	s.InodeAttrs.Init(creds, devMajor, devMinor, ino, linux.ModeDirectory|perm)
+	s.InodeAttrs.Init(ctx, creds, devMajor, devMinor, ino, linux.ModeDirectory|perm)
 }
 
 // Open implements Inode.Open.
diff --git a/pkg/sentry/fsimpl/kernfs/kernfs.go b/pkg/sentry/fsimpl/kernfs/kernfs.go
index 606081e68..25184dbf9 100644
--- a/pkg/sentry/fsimpl/kernfs/kernfs.go
+++ b/pkg/sentry/fsimpl/kernfs/kernfs.go
@@ -267,7 +267,9 @@ func (d *Dentry) OnZeroWatches(context.Context) {}
 // this dentry. This does not update the directory inode, so calling this on its
 // own isn't sufficient to insert a child into a directory.
 //
-// Precondition: d must represent a directory inode.
+// Preconditions:
+// * d must represent a directory inode.
+// * d.fs.mu must be locked for at least reading.
 func (d *Dentry) insertChild(name string, child *Dentry) {
 	d.dirMu.Lock()
 	d.insertChildLocked(name, child)
@@ -280,6 +282,7 @@ func (d *Dentry) insertChild(name string, child *Dentry) {
 // Preconditions:
 // * d must represent a directory inode.
 // * d.dirMu must be locked.
+// * d.fs.mu must be locked for at least reading.
 func (d *Dentry) insertChildLocked(name string, child *Dentry) {
 	if !d.isDir() {
 		panic(fmt.Sprintf("insertChildLocked called on non-directory Dentry: %+v.", d))
@@ -436,7 +439,7 @@ type inodeDirectory interface {
 	// the inode is a directory.
 	//
 	// The child returned by Lookup will be hashed into the VFS dentry tree,
-	// atleast for the duration of the current FS operation.
+	// at least for the duration of the current FS operation.
 	//
 	// Lookup must return the child with an extra reference whose ownership is
 	// transferred to the dentry that is created to point to that inode. If
@@ -454,7 +457,7 @@ type inodeDirectory interface {
 	// inside the entries returned by this IterDirents invocation. In other words,
 	// 'offset' should be used to calculate each vfs.Dirent.NextOff as well as
 	// the return value, while 'relOffset' is the place to start iteration.
-	IterDirents(ctx context.Context, callback vfs.IterDirentsCallback, offset, relOffset int64) (newOffset int64, err error)
+	IterDirents(ctx context.Context, mnt *vfs.Mount, callback vfs.IterDirentsCallback, offset, relOffset int64) (newOffset int64, err error)
 }
 
 type inodeSymlink interface {
diff --git a/pkg/sentry/fsimpl/kernfs/kernfs_test.go b/pkg/sentry/fsimpl/kernfs/kernfs_test.go
index 82fa19c03..2418eec44 100644
--- a/pkg/sentry/fsimpl/kernfs/kernfs_test.go
+++ b/pkg/sentry/fsimpl/kernfs/kernfs_test.go
@@ -36,7 +36,7 @@ const staticFileContent = "This is sample content for a static test file."
 
 // RootDentryFn is a generator function for creating the root dentry of a test
 // filesystem. See newTestSystem.
-type RootDentryFn func(*auth.Credentials, *filesystem) kernfs.Inode
+type RootDentryFn func(context.Context, *auth.Credentials, *filesystem) kernfs.Inode
 
 // newTestSystem sets up a minimal environment for running a test, including an
 // instance of a test filesystem. Tests can control the contents of the
@@ -72,10 +72,10 @@ type file struct {
 	content string
 }
 
-func (fs *filesystem) newFile(creds *auth.Credentials, content string) kernfs.Inode {
+func (fs *filesystem) newFile(ctx context.Context, creds *auth.Credentials, content string) kernfs.Inode {
 	f := &file{}
 	f.content = content
-	f.DynamicBytesFile.Init(creds, 0 /* devMajor */, 0 /* devMinor */, fs.NextIno(), f, 0777)
+	f.DynamicBytesFile.Init(ctx, creds, 0 /* devMajor */, 0 /* devMinor */, fs.NextIno(), f, 0777)
 	return f
 }
 
@@ -105,9 +105,9 @@ type readonlyDir struct {
 	locks vfs.FileLocks
 }
 
-func (fs *filesystem) newReadonlyDir(creds *auth.Credentials, mode linux.FileMode, contents map[string]kernfs.Inode) kernfs.Inode {
+func (fs *filesystem) newReadonlyDir(ctx context.Context, creds *auth.Credentials, mode linux.FileMode, contents map[string]kernfs.Inode) kernfs.Inode {
 	dir := &readonlyDir{}
-	dir.attrs.Init(creds, 0 /* devMajor */, 0 /* devMinor */, fs.NextIno(), linux.ModeDirectory|mode)
+	dir.attrs.Init(ctx, creds, 0 /* devMajor */, 0 /* devMinor */, fs.NextIno(), linux.ModeDirectory|mode)
 	dir.OrderedChildren.Init(kernfs.OrderedChildrenOptions{})
 	dir.EnableLeakCheck()
 	dir.IncLinks(dir.OrderedChildren.Populate(contents))
@@ -142,10 +142,10 @@ type dir struct {
 	fs *filesystem
 }
 
-func (fs *filesystem) newDir(creds *auth.Credentials, mode linux.FileMode, contents map[string]kernfs.Inode) kernfs.Inode {
+func (fs *filesystem) newDir(ctx context.Context, creds *auth.Credentials, mode linux.FileMode, contents map[string]kernfs.Inode) kernfs.Inode {
 	dir := &dir{}
 	dir.fs = fs
-	dir.attrs.Init(creds, 0 /* devMajor */, 0 /* devMinor */, fs.NextIno(), linux.ModeDirectory|mode)
+	dir.attrs.Init(ctx, creds, 0 /* devMajor */, 0 /* devMinor */, fs.NextIno(), linux.ModeDirectory|mode)
 	dir.OrderedChildren.Init(kernfs.OrderedChildrenOptions{Writable: true})
 	dir.EnableLeakCheck()
 
@@ -169,22 +169,24 @@ func (d *dir) DecRef(ctx context.Context) {
 
 func (d *dir) NewDir(ctx context.Context, name string, opts vfs.MkdirOptions) (kernfs.Inode, error) {
 	creds := auth.CredentialsFromContext(ctx)
-	dir := d.fs.newDir(creds, opts.Mode, nil)
+	dir := d.fs.newDir(ctx, creds, opts.Mode, nil)
 	if err := d.OrderedChildren.Insert(name, dir); err != nil {
 		dir.DecRef(ctx)
 		return nil, err
 	}
+	d.TouchCMtime(ctx)
 	d.IncLinks(1)
 	return dir, nil
 }
 
 func (d *dir) NewFile(ctx context.Context, name string, opts vfs.OpenOptions) (kernfs.Inode, error) {
 	creds := auth.CredentialsFromContext(ctx)
-	f := d.fs.newFile(creds, "")
+	f := d.fs.newFile(ctx, creds, "")
 	if err := d.OrderedChildren.Insert(name, f); err != nil {
 		f.DecRef(ctx)
 		return nil, err
 	}
+	d.TouchCMtime(ctx)
 	return f, nil
 }
 
@@ -209,7 +211,7 @@ func (fsType) Release(ctx context.Context) {}
 func (fst fsType) GetFilesystem(ctx context.Context, vfsObj *vfs.VirtualFilesystem, creds *auth.Credentials, source string, opt vfs.GetFilesystemOptions) (*vfs.Filesystem, *vfs.Dentry, error) {
 	fs := &filesystem{}
 	fs.VFSFilesystem().Init(vfsObj, &fst, fs)
-	root := fst.rootFn(creds, fs)
+	root := fst.rootFn(ctx, creds, fs)
 	var d kernfs.Dentry
 	d.Init(&fs.Filesystem, root)
 	return fs.VFSFilesystem(), d.VFSDentry(), nil
@@ -218,9 +220,9 @@ func (fst fsType) GetFilesystem(ctx context.Context, vfsObj *vfs.VirtualFilesyst
 // -------------------- Remainder of the file are test cases --------------------
 
 func TestBasic(t *testing.T) {
-	sys := newTestSystem(t, func(creds *auth.Credentials, fs *filesystem) kernfs.Inode {
-		return fs.newReadonlyDir(creds, 0755, map[string]kernfs.Inode{
-			"file1": fs.newFile(creds, staticFileContent),
+	sys := newTestSystem(t, func(ctx context.Context, creds *auth.Credentials, fs *filesystem) kernfs.Inode {
+		return fs.newReadonlyDir(ctx, creds, 0755, map[string]kernfs.Inode{
+			"file1": fs.newFile(ctx, creds, staticFileContent),
 		})
 	})
 	defer sys.Destroy()
@@ -228,9 +230,9 @@ func TestBasic(t *testing.T) {
 }
 
 func TestMkdirGetDentry(t *testing.T) {
-	sys := newTestSystem(t, func(creds *auth.Credentials, fs *filesystem) kernfs.Inode {
-		return fs.newReadonlyDir(creds, 0755, map[string]kernfs.Inode{
-			"dir1": fs.newDir(creds, 0755, nil),
+	sys := newTestSystem(t, func(ctx context.Context, creds *auth.Credentials, fs *filesystem) kernfs.Inode {
+		return fs.newReadonlyDir(ctx, creds, 0755, map[string]kernfs.Inode{
+			"dir1": fs.newDir(ctx, creds, 0755, nil),
 		})
 	})
 	defer sys.Destroy()
@@ -243,9 +245,9 @@ func TestMkdirGetDentry(t *testing.T) {
 }
 
 func TestReadStaticFile(t *testing.T) {
-	sys := newTestSystem(t, func(creds *auth.Credentials, fs *filesystem) kernfs.Inode {
-		return fs.newReadonlyDir(creds, 0755, map[string]kernfs.Inode{
-			"file1": fs.newFile(creds, staticFileContent),
+	sys := newTestSystem(t, func(ctx context.Context, creds *auth.Credentials, fs *filesystem) kernfs.Inode {
+		return fs.newReadonlyDir(ctx, creds, 0755, map[string]kernfs.Inode{
+			"file1": fs.newFile(ctx, creds, staticFileContent),
 		})
 	})
 	defer sys.Destroy()
@@ -269,9 +271,9 @@ func TestReadStaticFile(t *testing.T) {
 }
 
 func TestCreateNewFileInStaticDir(t *testing.T) {
-	sys := newTestSystem(t, func(creds *auth.Credentials, fs *filesystem) kernfs.Inode {
-		return fs.newReadonlyDir(creds, 0755, map[string]kernfs.Inode{
-			"dir1": fs.newDir(creds, 0755, nil),
+	sys := newTestSystem(t, func(ctx context.Context, creds *auth.Credentials, fs *filesystem) kernfs.Inode {
+		return fs.newReadonlyDir(ctx, creds, 0755, map[string]kernfs.Inode{
+			"dir1": fs.newDir(ctx, creds, 0755, nil),
 		})
 	})
 	defer sys.Destroy()
@@ -296,8 +298,8 @@ func TestCreateNewFileInStaticDir(t *testing.T) {
 }
 
 func TestDirFDReadWrite(t *testing.T) {
-	sys := newTestSystem(t, func(creds *auth.Credentials, fs *filesystem) kernfs.Inode {
-		return fs.newReadonlyDir(creds, 0755, nil)
+	sys := newTestSystem(t, func(ctx context.Context, creds *auth.Credentials, fs *filesystem) kernfs.Inode {
+		return fs.newReadonlyDir(ctx, creds, 0755, nil)
 	})
 	defer sys.Destroy()
 
@@ -320,14 +322,14 @@ func TestDirFDReadWrite(t *testing.T) {
 }
 
 func TestDirFDIterDirents(t *testing.T) {
-	sys := newTestSystem(t, func(creds *auth.Credentials, fs *filesystem) kernfs.Inode {
-		return fs.newReadonlyDir(creds, 0755, map[string]kernfs.Inode{
+	sys := newTestSystem(t, func(ctx context.Context, creds *auth.Credentials, fs *filesystem) kernfs.Inode {
+		return fs.newReadonlyDir(ctx, creds, 0755, map[string]kernfs.Inode{
 			// Fill root with nodes backed by various inode implementations.
-			"dir1": fs.newReadonlyDir(creds, 0755, nil),
-			"dir2": fs.newDir(creds, 0755, map[string]kernfs.Inode{
-				"dir3": fs.newDir(creds, 0755, nil),
+			"dir1": fs.newReadonlyDir(ctx, creds, 0755, nil),
+			"dir2": fs.newDir(ctx, creds, 0755, map[string]kernfs.Inode{
+				"dir3": fs.newDir(ctx, creds, 0755, nil),
 			}),
-			"file1": fs.newFile(creds, staticFileContent),
+			"file1": fs.newFile(ctx, creds, staticFileContent),
 		})
 	})
 	defer sys.Destroy()
diff --git a/pkg/sentry/fsimpl/kernfs/symlink.go b/pkg/sentry/fsimpl/kernfs/symlink.go
index 934cc6c9e..a0736c0d6 100644
--- a/pkg/sentry/fsimpl/kernfs/symlink.go
+++ b/pkg/sentry/fsimpl/kernfs/symlink.go
@@ -38,16 +38,16 @@ type StaticSymlink struct {
 var _ Inode = (*StaticSymlink)(nil)
 
 // NewStaticSymlink creates a new symlink file pointing to 'target'.
-func NewStaticSymlink(creds *auth.Credentials, devMajor, devMinor uint32, ino uint64, target string) Inode {
+func NewStaticSymlink(ctx context.Context, creds *auth.Credentials, devMajor, devMinor uint32, ino uint64, target string) Inode {
 	inode := &StaticSymlink{}
-	inode.Init(creds, devMajor, devMinor, ino, target)
+	inode.Init(ctx, creds, devMajor, devMinor, ino, target)
 	return inode
 }
 
 // Init initializes the instance.
-func (s *StaticSymlink) Init(creds *auth.Credentials, devMajor uint32, devMinor uint32, ino uint64, target string) {
+func (s *StaticSymlink) Init(ctx context.Context, creds *auth.Credentials, devMajor uint32, devMinor uint32, ino uint64, target string) {
 	s.target = target
-	s.InodeAttrs.Init(creds, devMajor, devMinor, ino, linux.ModeSymlink|0777)
+	s.InodeAttrs.Init(ctx, creds, devMajor, devMinor, ino, linux.ModeSymlink|0777)
 }
 
 // Readlink implements Inode.Readlink.
diff --git a/pkg/sentry/fsimpl/kernfs/synthetic_directory.go b/pkg/sentry/fsimpl/kernfs/synthetic_directory.go
index d0ed17b18..463d77d79 100644
--- a/pkg/sentry/fsimpl/kernfs/synthetic_directory.go
+++ b/pkg/sentry/fsimpl/kernfs/synthetic_directory.go
@@ -41,17 +41,17 @@ type syntheticDirectory struct {
 
 var _ Inode = (*syntheticDirectory)(nil)
 
-func newSyntheticDirectory(creds *auth.Credentials, perm linux.FileMode) Inode {
+func newSyntheticDirectory(ctx context.Context, creds *auth.Credentials, perm linux.FileMode) Inode {
 	inode := &syntheticDirectory{}
-	inode.Init(creds, 0 /* devMajor */, 0 /* devMinor */, 0 /* ino */, perm)
+	inode.Init(ctx, creds, 0 /* devMajor */, 0 /* devMinor */, 0 /* ino */, perm)
 	return inode
 }
 
-func (dir *syntheticDirectory) Init(creds *auth.Credentials, devMajor, devMinor uint32, ino uint64, perm linux.FileMode) {
+func (dir *syntheticDirectory) Init(ctx context.Context, creds *auth.Credentials, devMajor, devMinor uint32, ino uint64, perm linux.FileMode) {
 	if perm&^linux.PermissionsMask != 0 {
 		panic(fmt.Sprintf("perm contains non-permission bits: %#o", perm))
 	}
-	dir.InodeAttrs.Init(creds, devMajor, devMinor, ino, linux.S_IFDIR|perm)
+	dir.InodeAttrs.Init(ctx, creds, devMajor, devMinor, ino, linux.S_IFDIR|perm)
 	dir.OrderedChildren.Init(OrderedChildrenOptions{
 		Writable: true,
 	})
@@ -76,11 +76,12 @@ func (dir *syntheticDirectory) NewDir(ctx context.Context, name string, opts vfs
 	if !opts.ForSyntheticMountpoint {
 		return nil, syserror.EPERM
 	}
-	subdirI := newSyntheticDirectory(auth.CredentialsFromContext(ctx), opts.Mode&linux.PermissionsMask)
+	subdirI := newSyntheticDirectory(ctx, auth.CredentialsFromContext(ctx), opts.Mode&linux.PermissionsMask)
 	if err := dir.OrderedChildren.Insert(name, subdirI); err != nil {
 		subdirI.DecRef(ctx)
 		return nil, err
 	}
+	dir.TouchCMtime(ctx)
 	return subdirI, nil
 }
 
diff --git a/pkg/sentry/fsimpl/proc/filesystem.go b/pkg/sentry/fsimpl/proc/filesystem.go
index fd70a07de..ba809b92d 100644
--- a/pkg/sentry/fsimpl/proc/filesystem.go
+++ b/pkg/sentry/fsimpl/proc/filesystem.go
@@ -74,7 +74,7 @@ func (ft FilesystemType) GetFilesystem(ctx context.Context, vfsObj *vfs.VirtualF
 		cgroups = data.Cgroups
 	}
 
-	inode := procfs.newTasksInode(k, pidns, cgroups)
+	inode := procfs.newTasksInode(ctx, k, pidns, cgroups)
 	var dentry kernfs.Dentry
 	dentry.Init(&procfs.Filesystem, inode)
 	return procfs.VFSFilesystem(), dentry.VFSDentry(), nil
@@ -94,11 +94,11 @@ type dynamicInode interface {
 	kernfs.Inode
 	vfs.DynamicBytesSource
 
-	Init(creds *auth.Credentials, devMajor, devMinor uint32, ino uint64, data vfs.DynamicBytesSource, perm linux.FileMode)
+	Init(ctx context.Context, creds *auth.Credentials, devMajor, devMinor uint32, ino uint64, data vfs.DynamicBytesSource, perm linux.FileMode)
 }
 
-func (fs *filesystem) newInode(creds *auth.Credentials, perm linux.FileMode, inode dynamicInode) dynamicInode {
-	inode.Init(creds, linux.UNNAMED_MAJOR, fs.devMinor, fs.NextIno(), inode, perm)
+func (fs *filesystem) newInode(ctx context.Context, creds *auth.Credentials, perm linux.FileMode, inode dynamicInode) dynamicInode {
+	inode.Init(ctx, creds, linux.UNNAMED_MAJOR, fs.devMinor, fs.NextIno(), inode, perm)
 	return inode
 }
 
@@ -114,8 +114,8 @@ func newStaticFile(data string) *staticFile {
 	return &staticFile{StaticData: vfs.StaticData{Data: data}}
 }
 
-func (fs *filesystem) newStaticDir(creds *auth.Credentials, children map[string]kernfs.Inode) kernfs.Inode {
-	return kernfs.NewStaticDir(creds, linux.UNNAMED_MAJOR, fs.devMinor, fs.NextIno(), 0555, children, kernfs.GenericDirectoryFDOptions{
+func (fs *filesystem) newStaticDir(ctx context.Context, creds *auth.Credentials, children map[string]kernfs.Inode) kernfs.Inode {
+	return kernfs.NewStaticDir(ctx, creds, linux.UNNAMED_MAJOR, fs.devMinor, fs.NextIno(), 0555, children, kernfs.GenericDirectoryFDOptions{
 		SeekEnd: kernfs.SeekEndZero,
 	})
 }
diff --git a/pkg/sentry/fsimpl/proc/subtasks.go b/pkg/sentry/fsimpl/proc/subtasks.go
index bad2fab4f..cb3c5e0fd 100644
--- a/pkg/sentry/fsimpl/proc/subtasks.go
+++ b/pkg/sentry/fsimpl/proc/subtasks.go
@@ -58,7 +58,7 @@ func (fs *filesystem) newSubtasks(task *kernel.Task, pidns *kernel.PIDNamespace,
 		cgroupControllers: cgroupControllers,
 	}
 	// Note: credentials are overridden by taskOwnedInode.
-	subInode.InodeAttrs.Init(task.Credentials(), linux.UNNAMED_MAJOR, fs.devMinor, fs.NextIno(), linux.ModeDirectory|0555)
+	subInode.InodeAttrs.Init(task, task.Credentials(), linux.UNNAMED_MAJOR, fs.devMinor, fs.NextIno(), linux.ModeDirectory|0555)
 	subInode.OrderedChildren.Init(kernfs.OrderedChildrenOptions{})
 	subInode.EnableLeakCheck()
 
@@ -84,7 +84,7 @@ func (i *subtasksInode) Lookup(ctx context.Context, name string) (kernfs.Inode,
 }
 
 // IterDirents implements kernfs.inodeDirectory.IterDirents.
-func (i *subtasksInode) IterDirents(ctx context.Context, cb vfs.IterDirentsCallback, offset, relOffset int64) (int64, error) {
+func (i *subtasksInode) IterDirents(ctx context.Context, mnt *vfs.Mount, cb vfs.IterDirentsCallback, offset, relOffset int64) (int64, error) {
 	tasks := i.task.ThreadGroup().MemberIDs(i.pidns)
 	if len(tasks) == 0 {
 		return offset, syserror.ENOENT
diff --git a/pkg/sentry/fsimpl/proc/task.go b/pkg/sentry/fsimpl/proc/task.go
index b63a4eca0..57cf8ce26 100644
--- a/pkg/sentry/fsimpl/proc/task.go
+++ b/pkg/sentry/fsimpl/proc/task.go
@@ -89,7 +89,7 @@ func (fs *filesystem) newTaskInode(task *kernel.Task, pidns *kernel.PIDNamespace
 
 	taskInode := &taskInode{task: task}
 	// Note: credentials are overridden by taskOwnedInode.
-	taskInode.InodeAttrs.Init(task.Credentials(), linux.UNNAMED_MAJOR, fs.devMinor, fs.NextIno(), linux.ModeDirectory|0555)
+	taskInode.InodeAttrs.Init(task, task.Credentials(), linux.UNNAMED_MAJOR, fs.devMinor, fs.NextIno(), linux.ModeDirectory|0555)
 	taskInode.EnableLeakCheck()
 
 	inode := &taskOwnedInode{Inode: taskInode, owner: task}
@@ -144,7 +144,7 @@ var _ kernfs.Inode = (*taskOwnedInode)(nil)
 
 func (fs *filesystem) newTaskOwnedInode(task *kernel.Task, ino uint64, perm linux.FileMode, inode dynamicInode) kernfs.Inode {
 	// Note: credentials are overridden by taskOwnedInode.
-	inode.Init(task.Credentials(), linux.UNNAMED_MAJOR, fs.devMinor, ino, inode, perm)
+	inode.Init(task, task.Credentials(), linux.UNNAMED_MAJOR, fs.devMinor, ino, inode, perm)
 
 	return &taskOwnedInode{Inode: inode, owner: task}
 }
@@ -152,7 +152,7 @@ func (fs *filesystem) newTaskOwnedInode(task *kernel.Task, ino uint64, perm linu
 func (fs *filesystem) newTaskOwnedDir(task *kernel.Task, ino uint64, perm linux.FileMode, children map[string]kernfs.Inode) kernfs.Inode {
 	// Note: credentials are overridden by taskOwnedInode.
 	fdOpts := kernfs.GenericDirectoryFDOptions{SeekEnd: kernfs.SeekEndZero}
-	dir := kernfs.NewStaticDir(task.Credentials(), linux.UNNAMED_MAJOR, fs.devMinor, ino, perm, children, fdOpts)
+	dir := kernfs.NewStaticDir(task, task.Credentials(), linux.UNNAMED_MAJOR, fs.devMinor, ino, perm, children, fdOpts)
 
 	return &taskOwnedInode{Inode: dir, owner: task}
 }
diff --git a/pkg/sentry/fsimpl/proc/task_fds.go b/pkg/sentry/fsimpl/proc/task_fds.go
index 2c80ac5c2..d268b44be 100644
--- a/pkg/sentry/fsimpl/proc/task_fds.go
+++ b/pkg/sentry/fsimpl/proc/task_fds.go
@@ -64,7 +64,7 @@ type fdDir struct {
 }
 
 // IterDirents implements kernfs.inodeDirectory.IterDirents.
-func (i *fdDir) IterDirents(ctx context.Context, cb vfs.IterDirentsCallback, offset, relOffset int64) (int64, error) {
+func (i *fdDir) IterDirents(ctx context.Context, mnt *vfs.Mount, cb vfs.IterDirentsCallback, offset, relOffset int64) (int64, error) {
 	var fds []int32
 	i.task.WithMuLocked(func(t *kernel.Task) {
 		if fdTable := t.FDTable(); fdTable != nil {
@@ -127,15 +127,15 @@ func (fs *filesystem) newFDDirInode(task *kernel.Task) kernfs.Inode {
 			produceSymlink: true,
 		},
 	}
-	inode.InodeAttrs.Init(task.Credentials(), linux.UNNAMED_MAJOR, fs.devMinor, fs.NextIno(), linux.ModeDirectory|0555)
+	inode.InodeAttrs.Init(task, task.Credentials(), linux.UNNAMED_MAJOR, fs.devMinor, fs.NextIno(), linux.ModeDirectory|0555)
 	inode.EnableLeakCheck()
 	inode.OrderedChildren.Init(kernfs.OrderedChildrenOptions{})
 	return inode
 }
 
 // IterDirents implements kernfs.inodeDirectory.IterDirents.
-func (i *fdDirInode) IterDirents(ctx context.Context, cb vfs.IterDirentsCallback, offset, relOffset int64) (int64, error) {
-	return i.fdDir.IterDirents(ctx, cb, offset, relOffset)
+func (i *fdDirInode) IterDirents(ctx context.Context, mnt *vfs.Mount, cb vfs.IterDirentsCallback, offset, relOffset int64) (int64, error) {
+	return i.fdDir.IterDirents(ctx, mnt, cb, offset, relOffset)
 }
 
 // Lookup implements kernfs.inodeDirectory.Lookup.
@@ -209,7 +209,7 @@ func (fs *filesystem) newFDSymlink(task *kernel.Task, fd int32, ino uint64) kern
 		task: task,
 		fd:   fd,
 	}
-	inode.Init(task.Credentials(), linux.UNNAMED_MAJOR, fs.devMinor, ino, linux.ModeSymlink|0777)
+	inode.Init(task, task.Credentials(), linux.UNNAMED_MAJOR, fs.devMinor, ino, linux.ModeSymlink|0777)
 	return inode
 }
 
@@ -264,7 +264,7 @@ func (fs *filesystem) newFDInfoDirInode(task *kernel.Task) kernfs.Inode {
 			task: task,
 		},
 	}
-	inode.InodeAttrs.Init(task.Credentials(), linux.UNNAMED_MAJOR, fs.devMinor, fs.NextIno(), linux.ModeDirectory|0555)
+	inode.InodeAttrs.Init(task, task.Credentials(), linux.UNNAMED_MAJOR, fs.devMinor, fs.NextIno(), linux.ModeDirectory|0555)
 	inode.EnableLeakCheck()
 	inode.OrderedChildren.Init(kernfs.OrderedChildrenOptions{})
 	return inode
@@ -288,8 +288,8 @@ func (i *fdInfoDirInode) Lookup(ctx context.Context, name string) (kernfs.Inode,
 }
 
 // IterDirents implements Inode.IterDirents.
-func (i *fdInfoDirInode) IterDirents(ctx context.Context, cb vfs.IterDirentsCallback, offset, relOffset int64) (newOffset int64, err error) {
-	return i.fdDir.IterDirents(ctx, cb, offset, relOffset)
+func (i *fdInfoDirInode) IterDirents(ctx context.Context, mnt *vfs.Mount, cb vfs.IterDirentsCallback, offset, relOffset int64) (newOffset int64, err error) {
+	return i.fdDir.IterDirents(ctx, mnt, cb, offset, relOffset)
 }
 
 // Open implements kernfs.Inode.Open.
diff --git a/pkg/sentry/fsimpl/proc/task_files.go b/pkg/sentry/fsimpl/proc/task_files.go
index 79f8b7e9f..d3f4e259b 100644
--- a/pkg/sentry/fsimpl/proc/task_files.go
+++ b/pkg/sentry/fsimpl/proc/task_files.go
@@ -249,7 +249,7 @@ type commInode struct {
 
 func (fs *filesystem) newComm(task *kernel.Task, ino uint64, perm linux.FileMode) kernfs.Inode {
 	inode := &commInode{task: task}
-	inode.DynamicBytesFile.Init(task.Credentials(), linux.UNNAMED_MAJOR, fs.devMinor, ino, &commData{task: task}, perm)
+	inode.DynamicBytesFile.Init(task, task.Credentials(), linux.UNNAMED_MAJOR, fs.devMinor, ino, &commData{task: task}, perm)
 	return inode
 }
 
@@ -657,7 +657,7 @@ var _ kernfs.Inode = (*exeSymlink)(nil)
 
 func (fs *filesystem) newExeSymlink(task *kernel.Task, ino uint64) kernfs.Inode {
 	inode := &exeSymlink{task: task}
-	inode.Init(task.Credentials(), linux.UNNAMED_MAJOR, fs.devMinor, ino, linux.ModeSymlink|0777)
+	inode.Init(task, task.Credentials(), linux.UNNAMED_MAJOR, fs.devMinor, ino, linux.ModeSymlink|0777)
 	return inode
 }
 
@@ -733,7 +733,7 @@ var _ kernfs.Inode = (*cwdSymlink)(nil)
 
 func (fs *filesystem) newCwdSymlink(task *kernel.Task, ino uint64) kernfs.Inode {
 	inode := &cwdSymlink{task: task}
-	inode.Init(task.Credentials(), linux.UNNAMED_MAJOR, fs.devMinor, ino, linux.ModeSymlink|0777)
+	inode.Init(task, task.Credentials(), linux.UNNAMED_MAJOR, fs.devMinor, ino, linux.ModeSymlink|0777)
 	return inode
 }
 
@@ -850,7 +850,7 @@ func (fs *filesystem) newNamespaceSymlink(task *kernel.Task, ino uint64, ns stri
 
 	inode := &namespaceSymlink{task: task}
 	// Note: credentials are overridden by taskOwnedInode.
-	inode.Init(task.Credentials(), linux.UNNAMED_MAJOR, fs.devMinor, ino, target)
+	inode.Init(task, task.Credentials(), linux.UNNAMED_MAJOR, fs.devMinor, ino, target)
 
 	taskInode := &taskOwnedInode{Inode: inode, owner: task}
 	return taskInode
@@ -872,8 +872,10 @@ func (s *namespaceSymlink) Getlink(ctx context.Context, mnt *vfs.Mount) (vfs.Vir
 
 	// Create a synthetic inode to represent the namespace.
 	fs := mnt.Filesystem().Impl().(*filesystem)
+	nsInode := &namespaceInode{}
+	nsInode.Init(ctx, auth.CredentialsFromContext(ctx), linux.UNNAMED_MAJOR, fs.devMinor, fs.NextIno(), 0444)
 	dentry := &kernfs.Dentry{}
-	dentry.Init(&fs.Filesystem, &namespaceInode{})
+	dentry.Init(&fs.Filesystem, nsInode)
 	vd := vfs.MakeVirtualDentry(mnt, dentry.VFSDentry())
 	// Only IncRef vd.Mount() because vd.Dentry() already holds a ref of 1.
 	mnt.IncRef()
@@ -897,11 +899,11 @@ type namespaceInode struct {
 var _ kernfs.Inode = (*namespaceInode)(nil)
 
 // Init initializes a namespace inode.
-func (i *namespaceInode) Init(creds *auth.Credentials, devMajor, devMinor uint32, ino uint64, perm linux.FileMode) {
+func (i *namespaceInode) Init(ctx context.Context, creds *auth.Credentials, devMajor, devMinor uint32, ino uint64, perm linux.FileMode) {
 	if perm&^linux.PermissionsMask != 0 {
 		panic(fmt.Sprintf("Only permission mask must be set: %x", perm&linux.PermissionsMask))
 	}
-	i.InodeAttrs.Init(creds, devMajor, devMinor, ino, linux.ModeRegular|perm)
+	i.InodeAttrs.Init(ctx, creds, devMajor, devMinor, ino, linux.ModeRegular|perm)
 }
 
 // Open implements kernfs.Inode.Open.
diff --git a/pkg/sentry/fsimpl/proc/task_net.go b/pkg/sentry/fsimpl/proc/task_net.go
index 3425e8698..5a9ee111f 100644
--- a/pkg/sentry/fsimpl/proc/task_net.go
+++ b/pkg/sentry/fsimpl/proc/task_net.go
@@ -57,33 +57,33 @@ func (fs *filesystem) newTaskNetDir(task *kernel.Task) kernfs.Inode {
 		// TODO(gvisor.dev/issue/1833): Make sure file contents reflect the task
 		// network namespace.
 		contents = map[string]kernfs.Inode{
-			"dev":  fs.newInode(root, 0444, &netDevData{stack: stack}),
-			"snmp": fs.newInode(root, 0444, &netSnmpData{stack: stack}),
+			"dev":  fs.newInode(task, root, 0444, &netDevData{stack: stack}),
+			"snmp": fs.newInode(task, root, 0444, &netSnmpData{stack: stack}),
 
 			// The following files are simple stubs until they are implemented in
 			// netstack, if the file contains a header the stub is just the header
 			// otherwise it is an empty file.
-			"arp":       fs.newInode(root, 0444, newStaticFile(arp)),
-			"netlink":   fs.newInode(root, 0444, newStaticFile(netlink)),
-			"netstat":   fs.newInode(root, 0444, &netStatData{}),
-			"packet":    fs.newInode(root, 0444, newStaticFile(packet)),
-			"protocols": fs.newInode(root, 0444, newStaticFile(protocols)),
+			"arp":       fs.newInode(task, root, 0444, newStaticFile(arp)),
+			"netlink":   fs.newInode(task, root, 0444, newStaticFile(netlink)),
+			"netstat":   fs.newInode(task, root, 0444, &netStatData{}),
+			"packet":    fs.newInode(task, root, 0444, newStaticFile(packet)),
+			"protocols": fs.newInode(task, root, 0444, newStaticFile(protocols)),
 
 			// Linux sets psched values to: nsec per usec, psched tick in ns, 1000000,
 			// high res timer ticks per sec (ClockGetres returns 1ns resolution).
-			"psched": fs.newInode(root, 0444, newStaticFile(psched)),
-			"ptype":  fs.newInode(root, 0444, newStaticFile(ptype)),
-			"route":  fs.newInode(root, 0444, &netRouteData{stack: stack}),
-			"tcp":    fs.newInode(root, 0444, &netTCPData{kernel: k}),
-			"udp":    fs.newInode(root, 0444, &netUDPData{kernel: k}),
-			"unix":   fs.newInode(root, 0444, &netUnixData{kernel: k}),
+			"psched": fs.newInode(task, root, 0444, newStaticFile(psched)),
+			"ptype":  fs.newInode(task, root, 0444, newStaticFile(ptype)),
+			"route":  fs.newInode(task, root, 0444, &netRouteData{stack: stack}),
+			"tcp":    fs.newInode(task, root, 0444, &netTCPData{kernel: k}),
+			"udp":    fs.newInode(task, root, 0444, &netUDPData{kernel: k}),
+			"unix":   fs.newInode(task, root, 0444, &netUnixData{kernel: k}),
 		}
 
 		if stack.SupportsIPv6() {
-			contents["if_inet6"] = fs.newInode(root, 0444, &ifinet6{stack: stack})
-			contents["ipv6_route"] = fs.newInode(root, 0444, newStaticFile(""))
-			contents["tcp6"] = fs.newInode(root, 0444, &netTCP6Data{kernel: k})
-			contents["udp6"] = fs.newInode(root, 0444, newStaticFile(upd6))
+			contents["if_inet6"] = fs.newInode(task, root, 0444, &ifinet6{stack: stack})
+			contents["ipv6_route"] = fs.newInode(task, root, 0444, newStaticFile(""))
+			contents["tcp6"] = fs.newInode(task, root, 0444, &netTCP6Data{kernel: k})
+			contents["udp6"] = fs.newInode(task, root, 0444, newStaticFile(upd6))
 		}
 	}
 
diff --git a/pkg/sentry/fsimpl/proc/tasks.go b/pkg/sentry/fsimpl/proc/tasks.go
index 3259c3732..b81ea14bf 100644
--- a/pkg/sentry/fsimpl/proc/tasks.go
+++ b/pkg/sentry/fsimpl/proc/tasks.go
@@ -62,19 +62,19 @@ type tasksInode struct {
 
 var _ kernfs.Inode = (*tasksInode)(nil)
 
-func (fs *filesystem) newTasksInode(k *kernel.Kernel, pidns *kernel.PIDNamespace, cgroupControllers map[string]string) *tasksInode {
+func (fs *filesystem) newTasksInode(ctx context.Context, k *kernel.Kernel, pidns *kernel.PIDNamespace, cgroupControllers map[string]string) *tasksInode {
 	root := auth.NewRootCredentials(pidns.UserNamespace())
 	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.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.newInode(root, 0444, &statData{}),
-		"uptime":      fs.newInode(root, 0444, &uptimeData{}),
-		"version":     fs.newInode(root, 0444, &versionData{}),
+		"cpuinfo":     fs.newInode(ctx, root, 0444, newStaticFileSetStat(cpuInfoData(k))),
+		"filesystems": fs.newInode(ctx, root, 0444, &filesystemsData{}),
+		"loadavg":     fs.newInode(ctx, root, 0444, &loadavgData{}),
+		"sys":         fs.newSysDir(ctx, root, k),
+		"meminfo":     fs.newInode(ctx, root, 0444, &meminfoData{}),
+		"mounts":      kernfs.NewStaticSymlink(ctx, root, linux.UNNAMED_MAJOR, fs.devMinor, fs.NextIno(), "self/mounts"),
+		"net":         kernfs.NewStaticSymlink(ctx, root, linux.UNNAMED_MAJOR, fs.devMinor, fs.NextIno(), "self/net"),
+		"stat":        fs.newInode(ctx, root, 0444, &statData{}),
+		"uptime":      fs.newInode(ctx, root, 0444, &uptimeData{}),
+		"version":     fs.newInode(ctx, root, 0444, &versionData{}),
 	}
 
 	inode := &tasksInode{
@@ -82,7 +82,7 @@ func (fs *filesystem) newTasksInode(k *kernel.Kernel, pidns *kernel.PIDNamespace
 		fs:                fs,
 		cgroupControllers: cgroupControllers,
 	}
-	inode.InodeAttrs.Init(root, linux.UNNAMED_MAJOR, fs.devMinor, fs.NextIno(), linux.ModeDirectory|0555)
+	inode.InodeAttrs.Init(ctx, root, linux.UNNAMED_MAJOR, fs.devMinor, fs.NextIno(), linux.ModeDirectory|0555)
 	inode.EnableLeakCheck()
 
 	inode.OrderedChildren.Init(kernfs.OrderedChildrenOptions{})
@@ -106,9 +106,9 @@ func (i *tasksInode) Lookup(ctx context.Context, name string) (kernfs.Inode, err
 		// If it failed to parse, check if it's one of the special handled files.
 		switch name {
 		case selfName:
-			return i.newSelfSymlink(root), nil
+			return i.newSelfSymlink(ctx, root), nil
 		case threadSelfName:
-			return i.newThreadSelfSymlink(root), nil
+			return i.newThreadSelfSymlink(ctx, root), nil
 		}
 		return nil, syserror.ENOENT
 	}
@@ -122,7 +122,7 @@ func (i *tasksInode) Lookup(ctx context.Context, name string) (kernfs.Inode, err
 }
 
 // IterDirents implements kernfs.inodeDirectory.IterDirents.
-func (i *tasksInode) IterDirents(ctx context.Context, cb vfs.IterDirentsCallback, offset, _ int64) (int64, error) {
+func (i *tasksInode) IterDirents(ctx context.Context, mnt *vfs.Mount, cb vfs.IterDirentsCallback, offset, _ int64) (int64, error) {
 	// fs/proc/internal.h: #define FIRST_PROCESS_ENTRY 256
 	const FIRST_PROCESS_ENTRY = 256
 
diff --git a/pkg/sentry/fsimpl/proc/tasks_files.go b/pkg/sentry/fsimpl/proc/tasks_files.go
index 07c27cdd9..01b7a6678 100644
--- a/pkg/sentry/fsimpl/proc/tasks_files.go
+++ b/pkg/sentry/fsimpl/proc/tasks_files.go
@@ -43,9 +43,9 @@ type selfSymlink struct {
 
 var _ kernfs.Inode = (*selfSymlink)(nil)
 
-func (i *tasksInode) newSelfSymlink(creds *auth.Credentials) kernfs.Inode {
+func (i *tasksInode) newSelfSymlink(ctx context.Context, creds *auth.Credentials) kernfs.Inode {
 	inode := &selfSymlink{pidns: i.pidns}
-	inode.Init(creds, linux.UNNAMED_MAJOR, i.fs.devMinor, i.fs.NextIno(), linux.ModeSymlink|0777)
+	inode.Init(ctx, creds, linux.UNNAMED_MAJOR, i.fs.devMinor, i.fs.NextIno(), linux.ModeSymlink|0777)
 	return inode
 }
 
@@ -84,9 +84,9 @@ type threadSelfSymlink struct {
 
 var _ kernfs.Inode = (*threadSelfSymlink)(nil)
 
-func (i *tasksInode) newThreadSelfSymlink(creds *auth.Credentials) kernfs.Inode {
+func (i *tasksInode) newThreadSelfSymlink(ctx context.Context, creds *auth.Credentials) kernfs.Inode {
 	inode := &threadSelfSymlink{pidns: i.pidns}
-	inode.Init(creds, linux.UNNAMED_MAJOR, i.fs.devMinor, i.fs.NextIno(), linux.ModeSymlink|0777)
+	inode.Init(ctx, creds, linux.UNNAMED_MAJOR, i.fs.devMinor, i.fs.NextIno(), linux.ModeSymlink|0777)
 	return inode
 }
 
diff --git a/pkg/sentry/fsimpl/proc/tasks_sys.go b/pkg/sentry/fsimpl/proc/tasks_sys.go
index 95420368d..7c7afdcfa 100644
--- a/pkg/sentry/fsimpl/proc/tasks_sys.go
+++ b/pkg/sentry/fsimpl/proc/tasks_sys.go
@@ -40,93 +40,93 @@ const (
 )
 
 // newSysDir returns the dentry corresponding to /proc/sys directory.
-func (fs *filesystem) newSysDir(root *auth.Credentials, k *kernel.Kernel) kernfs.Inode {
-	return fs.newStaticDir(root, map[string]kernfs.Inode{
-		"kernel": fs.newStaticDir(root, map[string]kernfs.Inode{
-			"hostname": fs.newInode(root, 0444, &hostnameData{}),
-			"shmall":   fs.newInode(root, 0444, shmData(linux.SHMALL)),
-			"shmmax":   fs.newInode(root, 0444, shmData(linux.SHMMAX)),
-			"shmmni":   fs.newInode(root, 0444, shmData(linux.SHMMNI)),
+func (fs *filesystem) newSysDir(ctx context.Context, root *auth.Credentials, k *kernel.Kernel) kernfs.Inode {
+	return fs.newStaticDir(ctx, root, map[string]kernfs.Inode{
+		"kernel": fs.newStaticDir(ctx, root, map[string]kernfs.Inode{
+			"hostname": fs.newInode(ctx, root, 0444, &hostnameData{}),
+			"shmall":   fs.newInode(ctx, root, 0444, shmData(linux.SHMALL)),
+			"shmmax":   fs.newInode(ctx, root, 0444, shmData(linux.SHMMAX)),
+			"shmmni":   fs.newInode(ctx, root, 0444, shmData(linux.SHMMNI)),
 		}),
-		"vm": fs.newStaticDir(root, map[string]kernfs.Inode{
-			"mmap_min_addr":     fs.newInode(root, 0444, &mmapMinAddrData{k: k}),
-			"overcommit_memory": fs.newInode(root, 0444, newStaticFile("0\n")),
+		"vm": fs.newStaticDir(ctx, root, map[string]kernfs.Inode{
+			"mmap_min_addr":     fs.newInode(ctx, root, 0444, &mmapMinAddrData{k: k}),
+			"overcommit_memory": fs.newInode(ctx, root, 0444, newStaticFile("0\n")),
 		}),
-		"net": fs.newSysNetDir(root, k),
+		"net": fs.newSysNetDir(ctx, root, k),
 	})
 }
 
 // newSysNetDir returns the dentry corresponding to /proc/sys/net directory.
-func (fs *filesystem) newSysNetDir(root *auth.Credentials, k *kernel.Kernel) kernfs.Inode {
+func (fs *filesystem) newSysNetDir(ctx context.Context, root *auth.Credentials, k *kernel.Kernel) kernfs.Inode {
 	var contents map[string]kernfs.Inode
 
 	// TODO(gvisor.dev/issue/1833): Support for using the network stack in the
 	// network namespace of the calling process.
 	if stack := k.RootNetworkNamespace().Stack(); stack != nil {
 		contents = map[string]kernfs.Inode{
-			"ipv4": fs.newStaticDir(root, map[string]kernfs.Inode{
-				"tcp_recovery": fs.newInode(root, 0644, &tcpRecoveryData{stack: stack}),
-				"tcp_rmem":     fs.newInode(root, 0644, &tcpMemData{stack: stack, dir: tcpRMem}),
-				"tcp_sack":     fs.newInode(root, 0644, &tcpSackData{stack: stack}),
-				"tcp_wmem":     fs.newInode(root, 0644, &tcpMemData{stack: stack, dir: tcpWMem}),
-				"ip_forward":   fs.newInode(root, 0444, &ipForwarding{stack: stack}),
+			"ipv4": fs.newStaticDir(ctx, root, map[string]kernfs.Inode{
+				"tcp_recovery": fs.newInode(ctx, root, 0644, &tcpRecoveryData{stack: stack}),
+				"tcp_rmem":     fs.newInode(ctx, root, 0644, &tcpMemData{stack: stack, dir: tcpRMem}),
+				"tcp_sack":     fs.newInode(ctx, root, 0644, &tcpSackData{stack: stack}),
+				"tcp_wmem":     fs.newInode(ctx, root, 0644, &tcpMemData{stack: stack, dir: tcpWMem}),
+				"ip_forward":   fs.newInode(ctx, root, 0444, &ipForwarding{stack: stack}),
 
 				// The following files are simple stubs until they are implemented in
 				// netstack, most of these files are configuration related. We use the
 				// value closest to the actual netstack behavior or any empty file, all
 				// of these files will have mode 0444 (read-only for all users).
-				"ip_local_port_range":     fs.newInode(root, 0444, newStaticFile("16000   65535")),
-				"ip_local_reserved_ports": fs.newInode(root, 0444, newStaticFile("")),
-				"ipfrag_time":             fs.newInode(root, 0444, newStaticFile("30")),
-				"ip_nonlocal_bind":        fs.newInode(root, 0444, newStaticFile("0")),
-				"ip_no_pmtu_disc":         fs.newInode(root, 0444, newStaticFile("1")),
+				"ip_local_port_range":     fs.newInode(ctx, root, 0444, newStaticFile("16000   65535")),
+				"ip_local_reserved_ports": fs.newInode(ctx, root, 0444, newStaticFile("")),
+				"ipfrag_time":             fs.newInode(ctx, root, 0444, newStaticFile("30")),
+				"ip_nonlocal_bind":        fs.newInode(ctx, root, 0444, newStaticFile("0")),
+				"ip_no_pmtu_disc":         fs.newInode(ctx, root, 0444, newStaticFile("1")),
 
 				// tcp_allowed_congestion_control tell the user what they are able to
 				// do as an unprivledged process so we leave it empty.
-				"tcp_allowed_congestion_control":   fs.newInode(root, 0444, newStaticFile("")),
-				"tcp_available_congestion_control": fs.newInode(root, 0444, newStaticFile("reno")),
-				"tcp_congestion_control":           fs.newInode(root, 0444, newStaticFile("reno")),
+				"tcp_allowed_congestion_control":   fs.newInode(ctx, root, 0444, newStaticFile("")),
+				"tcp_available_congestion_control": fs.newInode(ctx, root, 0444, newStaticFile("reno")),
+				"tcp_congestion_control":           fs.newInode(ctx, root, 0444, newStaticFile("reno")),
 
 				// Many of the following stub files are features netstack doesn't
 				// support. The unsupported features return "0" to indicate they are
 				// disabled.
-				"tcp_base_mss":              fs.newInode(root, 0444, newStaticFile("1280")),
-				"tcp_dsack":                 fs.newInode(root, 0444, newStaticFile("0")),
-				"tcp_early_retrans":         fs.newInode(root, 0444, newStaticFile("0")),
-				"tcp_fack":                  fs.newInode(root, 0444, newStaticFile("0")),
-				"tcp_fastopen":              fs.newInode(root, 0444, newStaticFile("0")),
-				"tcp_fastopen_key":          fs.newInode(root, 0444, newStaticFile("")),
-				"tcp_invalid_ratelimit":     fs.newInode(root, 0444, newStaticFile("0")),
-				"tcp_keepalive_intvl":       fs.newInode(root, 0444, newStaticFile("0")),
-				"tcp_keepalive_probes":      fs.newInode(root, 0444, newStaticFile("0")),
-				"tcp_keepalive_time":        fs.newInode(root, 0444, newStaticFile("7200")),
-				"tcp_mtu_probing":           fs.newInode(root, 0444, newStaticFile("0")),
-				"tcp_no_metrics_save":       fs.newInode(root, 0444, newStaticFile("1")),
-				"tcp_probe_interval":        fs.newInode(root, 0444, newStaticFile("0")),
-				"tcp_probe_threshold":       fs.newInode(root, 0444, newStaticFile("0")),
-				"tcp_retries1":              fs.newInode(root, 0444, newStaticFile("3")),
-				"tcp_retries2":              fs.newInode(root, 0444, newStaticFile("15")),
-				"tcp_rfc1337":               fs.newInode(root, 0444, newStaticFile("1")),
-				"tcp_slow_start_after_idle": fs.newInode(root, 0444, newStaticFile("1")),
-				"tcp_synack_retries":        fs.newInode(root, 0444, newStaticFile("5")),
-				"tcp_syn_retries":           fs.newInode(root, 0444, newStaticFile("3")),
-				"tcp_timestamps":            fs.newInode(root, 0444, newStaticFile("1")),
+				"tcp_base_mss":              fs.newInode(ctx, root, 0444, newStaticFile("1280")),
+				"tcp_dsack":                 fs.newInode(ctx, root, 0444, newStaticFile("0")),
+				"tcp_early_retrans":         fs.newInode(ctx, root, 0444, newStaticFile("0")),
+				"tcp_fack":                  fs.newInode(ctx, root, 0444, newStaticFile("0")),
+				"tcp_fastopen":              fs.newInode(ctx, root, 0444, newStaticFile("0")),
+				"tcp_fastopen_key":          fs.newInode(ctx, root, 0444, newStaticFile("")),
+				"tcp_invalid_ratelimit":     fs.newInode(ctx, root, 0444, newStaticFile("0")),
+				"tcp_keepalive_intvl":       fs.newInode(ctx, root, 0444, newStaticFile("0")),
+				"tcp_keepalive_probes":      fs.newInode(ctx, root, 0444, newStaticFile("0")),
+				"tcp_keepalive_time":        fs.newInode(ctx, root, 0444, newStaticFile("7200")),
+				"tcp_mtu_probing":           fs.newInode(ctx, root, 0444, newStaticFile("0")),
+				"tcp_no_metrics_save":       fs.newInode(ctx, root, 0444, newStaticFile("1")),
+				"tcp_probe_interval":        fs.newInode(ctx, root, 0444, newStaticFile("0")),
+				"tcp_probe_threshold":       fs.newInode(ctx, root, 0444, newStaticFile("0")),
+				"tcp_retries1":              fs.newInode(ctx, root, 0444, newStaticFile("3")),
+				"tcp_retries2":              fs.newInode(ctx, root, 0444, newStaticFile("15")),
+				"tcp_rfc1337":               fs.newInode(ctx, root, 0444, newStaticFile("1")),
+				"tcp_slow_start_after_idle": fs.newInode(ctx, root, 0444, newStaticFile("1")),
+				"tcp_synack_retries":        fs.newInode(ctx, root, 0444, newStaticFile("5")),
+				"tcp_syn_retries":           fs.newInode(ctx, root, 0444, newStaticFile("3")),
+				"tcp_timestamps":            fs.newInode(ctx, root, 0444, newStaticFile("1")),
 			}),
-			"core": fs.newStaticDir(root, map[string]kernfs.Inode{
-				"default_qdisc": fs.newInode(root, 0444, newStaticFile("pfifo_fast")),
-				"message_burst": fs.newInode(root, 0444, newStaticFile("10")),
-				"message_cost":  fs.newInode(root, 0444, newStaticFile("5")),
-				"optmem_max":    fs.newInode(root, 0444, newStaticFile("0")),
-				"rmem_default":  fs.newInode(root, 0444, newStaticFile("212992")),
-				"rmem_max":      fs.newInode(root, 0444, newStaticFile("212992")),
-				"somaxconn":     fs.newInode(root, 0444, newStaticFile("128")),
-				"wmem_default":  fs.newInode(root, 0444, newStaticFile("212992")),
-				"wmem_max":      fs.newInode(root, 0444, newStaticFile("212992")),
+			"core": fs.newStaticDir(ctx, root, map[string]kernfs.Inode{
+				"default_qdisc": fs.newInode(ctx, root, 0444, newStaticFile("pfifo_fast")),
+				"message_burst": fs.newInode(ctx, root, 0444, newStaticFile("10")),
+				"message_cost":  fs.newInode(ctx, root, 0444, newStaticFile("5")),
+				"optmem_max":    fs.newInode(ctx, root, 0444, newStaticFile("0")),
+				"rmem_default":  fs.newInode(ctx, root, 0444, newStaticFile("212992")),
+				"rmem_max":      fs.newInode(ctx, root, 0444, newStaticFile("212992")),
+				"somaxconn":     fs.newInode(ctx, root, 0444, newStaticFile("128")),
+				"wmem_default":  fs.newInode(ctx, root, 0444, newStaticFile("212992")),
+				"wmem_max":      fs.newInode(ctx, root, 0444, newStaticFile("212992")),
 			}),
 		}
 	}
 
-	return fs.newStaticDir(root, contents)
+	return fs.newStaticDir(ctx, root, contents)
 }
 
 // mmapMinAddrData implements vfs.DynamicBytesSource for
diff --git a/pkg/sentry/fsimpl/sockfs/sockfs.go b/pkg/sentry/fsimpl/sockfs/sockfs.go
index cf91ea36c..fda1fa942 100644
--- a/pkg/sentry/fsimpl/sockfs/sockfs.go
+++ b/pkg/sentry/fsimpl/sockfs/sockfs.go
@@ -108,13 +108,13 @@ func (i *inode) StatFS(ctx context.Context, fs *vfs.Filesystem) (linux.Statfs, e
 // NewDentry constructs and returns a sockfs dentry.
 //
 // Preconditions: mnt.Filesystem() must have been returned by NewFilesystem().
-func NewDentry(creds *auth.Credentials, mnt *vfs.Mount) *vfs.Dentry {
+func NewDentry(ctx context.Context, mnt *vfs.Mount) *vfs.Dentry {
 	fs := mnt.Filesystem().Impl().(*filesystem)
 
 	// File mode matches net/socket.c:sock_alloc.
 	filemode := linux.FileMode(linux.S_IFSOCK | 0600)
 	i := &inode{}
-	i.InodeAttrs.Init(creds, linux.UNNAMED_MAJOR, fs.devMinor, fs.Filesystem.NextIno(), filemode)
+	i.InodeAttrs.Init(ctx, auth.CredentialsFromContext(ctx), linux.UNNAMED_MAJOR, fs.devMinor, fs.Filesystem.NextIno(), filemode)
 
 	d := &kernfs.Dentry{}
 	d.Init(&fs.Filesystem, i)
diff --git a/pkg/sentry/fsimpl/sys/kcov.go b/pkg/sentry/fsimpl/sys/kcov.go
index 31a361029..b13f141a8 100644
--- a/pkg/sentry/fsimpl/sys/kcov.go
+++ b/pkg/sentry/fsimpl/sys/kcov.go
@@ -29,7 +29,7 @@ import (
 
 func (fs *filesystem) newKcovFile(ctx context.Context, creds *auth.Credentials) kernfs.Inode {
 	k := &kcovInode{}
-	k.InodeAttrs.Init(creds, 0, 0, fs.NextIno(), linux.S_IFREG|0600)
+	k.InodeAttrs.Init(ctx, creds, 0, 0, fs.NextIno(), linux.S_IFREG|0600)
 	return k
 }
 
diff --git a/pkg/sentry/fsimpl/sys/sys.go b/pkg/sentry/fsimpl/sys/sys.go
index 1ad679830..54fa5eced 100644
--- a/pkg/sentry/fsimpl/sys/sys.go
+++ b/pkg/sentry/fsimpl/sys/sys.go
@@ -67,23 +67,23 @@ func (fsType FilesystemType) GetFilesystem(ctx context.Context, vfsObj *vfs.Virt
 	}
 	fs.VFSFilesystem().Init(vfsObj, &fsType, fs)
 
-	root := fs.newDir(creds, defaultSysDirMode, map[string]kernfs.Inode{
-		"block": fs.newDir(creds, defaultSysDirMode, nil),
-		"bus":   fs.newDir(creds, defaultSysDirMode, nil),
-		"class": fs.newDir(creds, defaultSysDirMode, map[string]kernfs.Inode{
-			"power_supply": fs.newDir(creds, defaultSysDirMode, nil),
+	root := fs.newDir(ctx, creds, defaultSysDirMode, map[string]kernfs.Inode{
+		"block": fs.newDir(ctx, creds, defaultSysDirMode, nil),
+		"bus":   fs.newDir(ctx, creds, defaultSysDirMode, nil),
+		"class": fs.newDir(ctx, creds, defaultSysDirMode, map[string]kernfs.Inode{
+			"power_supply": fs.newDir(ctx, creds, defaultSysDirMode, nil),
 		}),
-		"dev": fs.newDir(creds, defaultSysDirMode, nil),
-		"devices": fs.newDir(creds, defaultSysDirMode, map[string]kernfs.Inode{
-			"system": fs.newDir(creds, defaultSysDirMode, map[string]kernfs.Inode{
+		"dev": fs.newDir(ctx, creds, defaultSysDirMode, nil),
+		"devices": fs.newDir(ctx, creds, defaultSysDirMode, map[string]kernfs.Inode{
+			"system": fs.newDir(ctx, creds, defaultSysDirMode, map[string]kernfs.Inode{
 				"cpu": cpuDir(ctx, fs, creds),
 			}),
 		}),
-		"firmware": fs.newDir(creds, defaultSysDirMode, nil),
-		"fs":       fs.newDir(creds, defaultSysDirMode, nil),
+		"firmware": fs.newDir(ctx, creds, defaultSysDirMode, nil),
+		"fs":       fs.newDir(ctx, creds, defaultSysDirMode, nil),
 		"kernel":   kernelDir(ctx, fs, creds),
-		"module":   fs.newDir(creds, defaultSysDirMode, nil),
-		"power":    fs.newDir(creds, defaultSysDirMode, nil),
+		"module":   fs.newDir(ctx, creds, defaultSysDirMode, nil),
+		"power":    fs.newDir(ctx, creds, defaultSysDirMode, nil),
 	})
 	var rootD kernfs.Dentry
 	rootD.Init(&fs.Filesystem, root)
@@ -94,14 +94,14 @@ func cpuDir(ctx context.Context, fs *filesystem, creds *auth.Credentials) kernfs
 	k := kernel.KernelFromContext(ctx)
 	maxCPUCores := k.ApplicationCores()
 	children := map[string]kernfs.Inode{
-		"online":   fs.newCPUFile(creds, maxCPUCores, linux.FileMode(0444)),
-		"possible": fs.newCPUFile(creds, maxCPUCores, linux.FileMode(0444)),
-		"present":  fs.newCPUFile(creds, maxCPUCores, linux.FileMode(0444)),
+		"online":   fs.newCPUFile(ctx, creds, maxCPUCores, linux.FileMode(0444)),
+		"possible": fs.newCPUFile(ctx, creds, maxCPUCores, linux.FileMode(0444)),
+		"present":  fs.newCPUFile(ctx, creds, maxCPUCores, linux.FileMode(0444)),
 	}
 	for i := uint(0); i < maxCPUCores; i++ {
-		children[fmt.Sprintf("cpu%d", i)] = fs.newDir(creds, linux.FileMode(0555), nil)
+		children[fmt.Sprintf("cpu%d", i)] = fs.newDir(ctx, creds, linux.FileMode(0555), nil)
 	}
-	return fs.newDir(creds, defaultSysDirMode, children)
+	return fs.newDir(ctx, creds, defaultSysDirMode, children)
 }
 
 func kernelDir(ctx context.Context, fs *filesystem, creds *auth.Credentials) kernfs.Inode {
@@ -111,12 +111,12 @@ func kernelDir(ctx context.Context, fs *filesystem, creds *auth.Credentials) ker
 	var children map[string]kernfs.Inode
 	if coverage.KcovAvailable() {
 		children = map[string]kernfs.Inode{
-			"debug": fs.newDir(creds, linux.FileMode(0700), map[string]kernfs.Inode{
+			"debug": fs.newDir(ctx, creds, linux.FileMode(0700), map[string]kernfs.Inode{
 				"kcov": fs.newKcovFile(ctx, creds),
 			}),
 		}
 	}
-	return fs.newDir(creds, defaultSysDirMode, children)
+	return fs.newDir(ctx, creds, defaultSysDirMode, children)
 }
 
 // Release implements vfs.FilesystemImpl.Release.
@@ -140,9 +140,9 @@ type dir struct {
 	locks vfs.FileLocks
 }
 
-func (fs *filesystem) newDir(creds *auth.Credentials, mode linux.FileMode, contents map[string]kernfs.Inode) kernfs.Inode {
+func (fs *filesystem) newDir(ctx context.Context, creds *auth.Credentials, mode linux.FileMode, contents map[string]kernfs.Inode) kernfs.Inode {
 	d := &dir{}
-	d.InodeAttrs.Init(creds, linux.UNNAMED_MAJOR, fs.devMinor, fs.NextIno(), linux.ModeDirectory|0755)
+	d.InodeAttrs.Init(ctx, creds, linux.UNNAMED_MAJOR, fs.devMinor, fs.NextIno(), linux.ModeDirectory|0755)
 	d.OrderedChildren.Init(kernfs.OrderedChildrenOptions{})
 	d.EnableLeakCheck()
 	d.IncLinks(d.OrderedChildren.Populate(contents))
@@ -191,9 +191,9 @@ func (c *cpuFile) Generate(ctx context.Context, buf *bytes.Buffer) error {
 	return nil
 }
 
-func (fs *filesystem) newCPUFile(creds *auth.Credentials, maxCores uint, mode linux.FileMode) kernfs.Inode {
+func (fs *filesystem) newCPUFile(ctx context.Context, creds *auth.Credentials, maxCores uint, mode linux.FileMode) kernfs.Inode {
 	c := &cpuFile{maxCores: maxCores}
-	c.DynamicBytesFile.Init(creds, linux.UNNAMED_MAJOR, fs.devMinor, fs.NextIno(), c, mode)
+	c.DynamicBytesFile.Init(ctx, creds, linux.UNNAMED_MAJOR, fs.devMinor, fs.NextIno(), c, mode)
 	return c
 }