1 files changed, 0 insertions, 308 deletions
diff --git a/pkg/sentry/fsimpl/ext/directory.go b/pkg/sentry/fsimpl/ext/directory.go
deleted file mode 100644
index 0b471d121..000000000
--- a/pkg/sentry/fsimpl/ext/directory.go
+++ /dev/null
@@ -1,308 +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 ext
-
-import (
-	"sync"
-
-	"gvisor.dev/gvisor/pkg/abi/linux"
-	"gvisor.dev/gvisor/pkg/binary"
-	"gvisor.dev/gvisor/pkg/log"
-	"gvisor.dev/gvisor/pkg/sentry/context"
-	"gvisor.dev/gvisor/pkg/sentry/fs"
-	"gvisor.dev/gvisor/pkg/sentry/fsimpl/ext/disklayout"
-	"gvisor.dev/gvisor/pkg/sentry/memmap"
-	"gvisor.dev/gvisor/pkg/sentry/vfs"
-	"gvisor.dev/gvisor/pkg/syserror"
-)
-
-// directory represents a directory inode. It holds the childList in memory.
-type directory struct {
-	inode inode
-
-	// mu serializes the changes to childList.
-	// Lock Order (outermost locks must be taken first):
-	//   directory.mu
-	//     filesystem.mu
-	mu sync.Mutex
-
-	// childList is a list containing (1) child dirents and (2) fake dirents
-	// (with diskDirent == nil) that represent the iteration position of
-	// directoryFDs. childList is used to support directoryFD.IterDirents()
-	// efficiently. childList is protected by mu.
-	childList direntList
-
-	// childMap maps the child's filename to the dirent structure stored in
-	// childList. This adds some data replication but helps in faster path
-	// traversal. For consistency, key == childMap[key].diskDirent.FileName().
-	// Immutable.
-	childMap map[string]*dirent
-}
-
-// newDirectroy is the directory constructor.
-func newDirectroy(inode inode, newDirent bool) (*directory, error) {
-	file := &directory{inode: inode, childMap: make(map[string]*dirent)}
-	file.inode.impl = file
-
-	// Initialize childList by reading dirents from the underlying file.
-	if inode.diskInode.Flags().Index {
-		// TODO(b/134676337): Support hash tree directories. Currently only the '.'
-		// and '..' entries are read in.
-
-		// Users cannot navigate this hash tree directory yet.
-		log.Warningf("hash tree directory being used which is unsupported")
-		return file, nil
-	}
-
-	// The dirents are organized in a linear array in the file data.
-	// Extract the file data and decode the dirents.
-	regFile, err := newRegularFile(inode)
-	if err != nil {
-		return nil, err
-	}
-
-	// buf is used as scratch space for reading in dirents from disk and
-	// unmarshalling them into dirent structs.
-	buf := make([]byte, disklayout.DirentSize)
-	size := inode.diskInode.Size()
-	for off, inc := uint64(0), uint64(0); off < size; off += inc {
-		toRead := size - off
-		if toRead > disklayout.DirentSize {
-			toRead = disklayout.DirentSize
-		}
-		if n, err := regFile.impl.ReadAt(buf[:toRead], int64(off)); uint64(n) < toRead {
-			return nil, err
-		}
-
-		var curDirent dirent
-		if newDirent {
-			curDirent.diskDirent = &disklayout.DirentNew{}
-		} else {
-			curDirent.diskDirent = &disklayout.DirentOld{}
-		}
-		binary.Unmarshal(buf, binary.LittleEndian, curDirent.diskDirent)
-
-		if curDirent.diskDirent.Inode() != 0 && len(curDirent.diskDirent.FileName()) != 0 {
-			// Inode number and name length fields being set to 0 is used to indicate
-			// an unused dirent.
-			file.childList.PushBack(&curDirent)
-			file.childMap[curDirent.diskDirent.FileName()] = &curDirent
-		}
-
-		// The next dirent is placed exactly after this dirent record on disk.
-		inc = uint64(curDirent.diskDirent.RecordSize())
-	}
-
-	return file, nil
-}
-
-func (i *inode) isDir() bool {
-	_, ok := i.impl.(*directory)
-	return ok
-}
-
-// dirent is the directory.childList node.
-type dirent struct {
-	diskDirent disklayout.Dirent
-
-	// direntEntry links dirents into their parent directory.childList.
-	direntEntry
-}
-
-// directoryFD represents a directory file description. It implements
-// vfs.FileDescriptionImpl.
-type directoryFD struct {
-	fileDescription
-	vfs.DirectoryFileDescriptionDefaultImpl
-
-	// Protected by directory.mu.
-	iter *dirent
-	off  int64
-}
-
-// Compiles only if directoryFD implements vfs.FileDescriptionImpl.
-var _ vfs.FileDescriptionImpl = (*directoryFD)(nil)
-
-// Release implements vfs.FileDescriptionImpl.Release.
-func (fd *directoryFD) Release() {
-	if fd.iter == nil {
-		return
-	}
-
-	dir := fd.inode().impl.(*directory)
-	dir.mu.Lock()
-	dir.childList.Remove(fd.iter)
-	dir.mu.Unlock()
-	fd.iter = nil
-}
-
-// IterDirents implements vfs.FileDescriptionImpl.IterDirents.
-func (fd *directoryFD) IterDirents(ctx context.Context, cb vfs.IterDirentsCallback) error {
-	extfs := fd.filesystem()
-	dir := fd.inode().impl.(*directory)
-
-	dir.mu.Lock()
-	defer dir.mu.Unlock()
-
-	// Ensure that fd.iter exists and is not linked into dir.childList.
-	var child *dirent
-	if fd.iter == nil {
-		// Start iteration at the beginning of dir.
-		child = dir.childList.Front()
-		fd.iter = &dirent{}
-	} else {
-		// Continue iteration from where we left off.
-		child = fd.iter.Next()
-		dir.childList.Remove(fd.iter)
-	}
-	for ; child != nil; child = child.Next() {
-		// Skip other directoryFD iterators.
-		if child.diskDirent != nil {
-			childType, ok := child.diskDirent.FileType()
-			if !ok {
-				// We will need to read the inode off disk. Do not increment
-				// ref count here because this inode is not being added to the
-				// dentry tree.
-				extfs.mu.Lock()
-				childInode, err := extfs.getOrCreateInodeLocked(child.diskDirent.Inode())
-				extfs.mu.Unlock()
-				if err != nil {
-					// Usage of the file description after the error is
-					// undefined. This implementation would continue reading
-					// from the next dirent.
-					fd.off++
-					dir.childList.InsertAfter(child, fd.iter)
-					return err
-				}
-				childType = fs.ToInodeType(childInode.diskInode.Mode().FileType())
-			}
-
-			if !cb.Handle(vfs.Dirent{
-				Name:    child.diskDirent.FileName(),
-				Type:    fs.ToDirentType(childType),
-				Ino:     uint64(child.diskDirent.Inode()),
-				NextOff: fd.off + 1,
-			}) {
-				dir.childList.InsertBefore(child, fd.iter)
-				return nil
-			}
-			fd.off++
-		}
-	}
-	dir.childList.PushBack(fd.iter)
-	return nil
-}
-
-// Seek implements vfs.FileDescriptionImpl.Seek.
-func (fd *directoryFD) Seek(ctx context.Context, offset int64, whence int32) (int64, error) {
-	if whence != linux.SEEK_SET && whence != linux.SEEK_CUR {
-		return 0, syserror.EINVAL
-	}
-
-	dir := fd.inode().impl.(*directory)
-
-	dir.mu.Lock()
-	defer dir.mu.Unlock()
-
-	// Find resulting offset.
-	if whence == linux.SEEK_CUR {
-		offset += fd.off
-	}
-
-	if offset < 0 {
-		// lseek(2) specifies that EINVAL should be returned if the resulting offset
-		// is negative.
-		return 0, syserror.EINVAL
-	}
-
-	n := int64(len(dir.childMap))
-	realWantOff := offset
-	if realWantOff > n {
-		realWantOff = n
-	}
-	realCurOff := fd.off
-	if realCurOff > n {
-		realCurOff = n
-	}
-
-	// Ensure that fd.iter exists and is linked into dir.childList so we can
-	// intelligently seek from the optimal position.
-	if fd.iter == nil {
-		fd.iter = &dirent{}
-		dir.childList.PushFront(fd.iter)
-	}
-
-	// Guess that iterating from the current position is optimal.
-	child := fd.iter
-	diff := realWantOff - realCurOff // Shows direction and magnitude of travel.
-
-	// See if starting from the beginning or end is better.
-	abDiff := diff
-	if diff < 0 {
-		abDiff = -diff
-	}
-	if abDiff > realWantOff {
-		// Starting from the beginning is best.
-		child = dir.childList.Front()
-		diff = realWantOff
-	} else if abDiff > (n - realWantOff) {
-		// Starting from the end is best.
-		child = dir.childList.Back()
-		// (n - 1) because the last non-nil dirent represents the (n-1)th offset.
-		diff = realWantOff - (n - 1)
-	}
-
-	for child != nil {
-		// Skip other directoryFD iterators.
-		if child.diskDirent != nil {
-			if diff == 0 {
-				if child != fd.iter {
-					dir.childList.Remove(fd.iter)
-					dir.childList.InsertBefore(child, fd.iter)
-				}
-
-				fd.off = offset
-				return offset, nil
-			}
-
-			if diff < 0 {
-				diff++
-				child = child.Prev()
-			} else {
-				diff--
-				child = child.Next()
-			}
-			continue
-		}
-
-		if diff < 0 {
-			child = child.Prev()
-		} else {
-			child = child.Next()
-		}
-	}
-
-	// Reaching here indicates that the offset is beyond the end of the childList.
-	dir.childList.Remove(fd.iter)
-	dir.childList.PushBack(fd.iter)
-	fd.off = offset
-	return offset, nil
-}
-
-// IterDirents implements vfs.FileDescriptionImpl.IterDirents.
-func (fd *directoryFD) ConfigureMMap(ctx context.Context, opts memmap.MMapOpts) error {
-	// mmap(2) specifies that EACCESS should be returned for non-regular file fds.
-	return syserror.EACCES
-}