1 files changed, 0 insertions, 194 deletions
diff --git a/pkg/sentry/fsimpl/gofer/directory.go b/pkg/sentry/fsimpl/gofer/directory.go
deleted file mode 100644
index 5dbfc6250..000000000
--- a/pkg/sentry/fsimpl/gofer/directory.go
+++ /dev/null
@@ -1,194 +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 gofer
-
-import (
-	"sync"
-	"sync/atomic"
-
-	"gvisor.dev/gvisor/pkg/abi/linux"
-	"gvisor.dev/gvisor/pkg/context"
-	"gvisor.dev/gvisor/pkg/p9"
-	"gvisor.dev/gvisor/pkg/sentry/vfs"
-	"gvisor.dev/gvisor/pkg/syserror"
-)
-
-func (d *dentry) isDir() bool {
-	return d.fileType() == linux.S_IFDIR
-}
-
-// Preconditions: d.dirMu must be locked. d.isDir(). fs.opts.interop !=
-// InteropModeShared.
-func (d *dentry) cacheNegativeChildLocked(name string) {
-	if d.negativeChildren == nil {
-		d.negativeChildren = make(map[string]struct{})
-	}
-	d.negativeChildren[name] = struct{}{}
-}
-
-type directoryFD struct {
-	fileDescription
-	vfs.DirectoryFileDescriptionDefaultImpl
-
-	mu      sync.Mutex
-	off     int64
-	dirents []vfs.Dirent
-}
-
-// Release implements vfs.FileDescriptionImpl.Release.
-func (fd *directoryFD) Release() {
-}
-
-// IterDirents implements vfs.FileDescriptionImpl.IterDirents.
-func (fd *directoryFD) IterDirents(ctx context.Context, cb vfs.IterDirentsCallback) error {
-	fd.mu.Lock()
-	defer fd.mu.Unlock()
-
-	if fd.dirents == nil {
-		ds, err := fd.dentry().getDirents(ctx)
-		if err != nil {
-			return err
-		}
-		fd.dirents = ds
-	}
-
-	for fd.off < int64(len(fd.dirents)) {
-		if err := cb.Handle(fd.dirents[fd.off]); err != nil {
-			return err
-		}
-		fd.off++
-	}
-	return nil
-}
-
-// Preconditions: d.isDir(). There exists at least one directoryFD representing d.
-func (d *dentry) getDirents(ctx context.Context) ([]vfs.Dirent, error) {
-	// 9P2000.L's readdir does not specify behavior in the presence of
-	// concurrent mutation of an iterated directory, so implementations may
-	// duplicate or omit entries in this case, which violates POSIX semantics.
-	// Thus we read all directory entries while holding d.dirMu to exclude
-	// directory mutations. (Note that it is impossible for the client to
-	// exclude concurrent mutation from other remote filesystem users. Since
-	// there is no way to detect if the server has incorrectly omitted
-	// directory entries, we simply assume that the server is well-behaved
-	// under InteropModeShared.) This is inconsistent with Linux (which appears
-	// to assume that directory fids have the correct semantics, and translates
-	// struct file_operations::readdir calls directly to readdir RPCs), but is
-	// consistent with VFS1.
-	//
-	// NOTE(b/135560623): In particular, some gofer implementations may not
-	// retain state between calls to Readdir, so may not provide a coherent
-	// directory stream across in the presence of mutation.
-
-	d.fs.renameMu.RLock()
-	defer d.fs.renameMu.RUnlock()
-	d.dirMu.Lock()
-	defer d.dirMu.Unlock()
-	if d.dirents != nil {
-		return d.dirents, nil
-	}
-
-	// It's not clear if 9P2000.L's readdir is expected to return "." and "..",
-	// so we generate them here.
-	parent := d.vfsd.ParentOrSelf().Impl().(*dentry)
-	dirents := []vfs.Dirent{
-		{
-			Name:    ".",
-			Type:    linux.DT_DIR,
-			Ino:     d.ino,
-			NextOff: 1,
-		},
-		{
-			Name:    "..",
-			Type:    uint8(atomic.LoadUint32(&parent.mode) >> 12),
-			Ino:     parent.ino,
-			NextOff: 2,
-		},
-	}
-	off := uint64(0)
-	const count = 64 * 1024 // for consistency with the vfs1 client
-	d.handleMu.RLock()
-	defer d.handleMu.RUnlock()
-	if !d.handleReadable {
-		// This should not be possible because a readable handle should have
-		// been opened when the calling directoryFD was opened.
-		panic("gofer.dentry.getDirents called without a readable handle")
-	}
-	for {
-		p9ds, err := d.handle.file.readdir(ctx, off, count)
-		if err != nil {
-			return nil, err
-		}
-		if len(p9ds) == 0 {
-			// Cache dirents for future directoryFDs if permitted.
-			if d.fs.opts.interop != InteropModeShared {
-				d.dirents = dirents
-			}
-			return dirents, nil
-		}
-		for _, p9d := range p9ds {
-			if p9d.Name == "." || p9d.Name == ".." {
-				continue
-			}
-			dirent := vfs.Dirent{
-				Name:    p9d.Name,
-				Ino:     p9d.QID.Path,
-				NextOff: int64(len(dirents) + 1),
-			}
-			// p9 does not expose 9P2000.U's DMDEVICE, DMNAMEDPIPE, or
-			// DMSOCKET.
-			switch p9d.Type {
-			case p9.TypeSymlink:
-				dirent.Type = linux.DT_LNK
-			case p9.TypeDir:
-				dirent.Type = linux.DT_DIR
-			default:
-				dirent.Type = linux.DT_REG
-			}
-			dirents = append(dirents, dirent)
-		}
-		off = p9ds[len(p9ds)-1].Offset
-	}
-}
-
-// Seek implements vfs.FileDescriptionImpl.Seek.
-func (fd *directoryFD) Seek(ctx context.Context, offset int64, whence int32) (int64, error) {
-	fd.mu.Lock()
-	defer fd.mu.Unlock()
-
-	switch whence {
-	case linux.SEEK_SET:
-		if offset < 0 {
-			return 0, syserror.EINVAL
-		}
-		if offset == 0 {
-			// Ensure that the next call to fd.IterDirents() calls
-			// fd.dentry().getDirents().
-			fd.dirents = nil
-		}
-		fd.off = offset
-		return fd.off, nil
-	case linux.SEEK_CUR:
-		offset += fd.off
-		if offset < 0 {
-			return 0, syserror.EINVAL
-		}
-		// Don't clear fd.dirents in this case, even if offset == 0.
-		fd.off = offset
-		return fd.off, nil
-	default:
-		return 0, syserror.EINVAL
-	}
-}