1 files changed, 0 insertions, 225 deletions
diff --git a/pkg/sentry/fsimpl/ext/inode.go b/pkg/sentry/fsimpl/ext/inode.go
deleted file mode 100644
index 24249525c..000000000
--- a/pkg/sentry/fsimpl/ext/inode.go
+++ /dev/null
@@ -1,225 +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 (
-	"fmt"
-	"sync/atomic"
-
-	"gvisor.dev/gvisor/pkg/abi/linux"
-	"gvisor.dev/gvisor/pkg/sentry/fsimpl/ext/disklayout"
-	"gvisor.dev/gvisor/pkg/sentry/kernel/auth"
-	"gvisor.dev/gvisor/pkg/sentry/vfs"
-	"gvisor.dev/gvisor/pkg/syserror"
-)
-
-// inode represents an ext inode.
-//
-// inode uses the same inheritance pattern that pkg/sentry/vfs structures use.
-// This has been done to increase memory locality.
-//
-// Implementations:
-//    inode --
-//           |-- dir
-//           |-- symlink
-//           |-- regular--
-//                       |-- extent file
-//                       |-- block map file
-type inode struct {
-	// refs is a reference count. refs is accessed using atomic memory operations.
-	refs int64
-
-	// fs is the containing filesystem.
-	fs *filesystem
-
-	// inodeNum is the inode number of this inode on disk. This is used to
-	// identify inodes within the ext filesystem.
-	inodeNum uint32
-
-	// blkSize is the fs data block size. Same as filesystem.sb.BlockSize().
-	blkSize uint64
-
-	// diskInode gives us access to the inode struct on disk. Immutable.
-	diskInode disklayout.Inode
-
-	// This is immutable. The first field of the implementations must have inode
-	// as the first field to ensure temporality.
-	impl interface{}
-}
-
-// incRef increments the inode ref count.
-func (in *inode) incRef() {
-	atomic.AddInt64(&in.refs, 1)
-}
-
-// tryIncRef tries to increment the ref count. Returns true if successful.
-func (in *inode) tryIncRef() bool {
-	for {
-		refs := atomic.LoadInt64(&in.refs)
-		if refs == 0 {
-			return false
-		}
-		if atomic.CompareAndSwapInt64(&in.refs, refs, refs+1) {
-			return true
-		}
-	}
-}
-
-// decRef decrements the inode ref count and releases the inode resources if
-// the ref count hits 0.
-//
-// Precondition: Must have locked filesystem.mu.
-func (in *inode) decRef() {
-	if refs := atomic.AddInt64(&in.refs, -1); refs == 0 {
-		delete(in.fs.inodeCache, in.inodeNum)
-	} else if refs < 0 {
-		panic("ext.inode.decRef() called without holding a reference")
-	}
-}
-
-// newInode is the inode constructor. Reads the inode off disk. Identifies
-// inodes based on the absolute inode number on disk.
-func newInode(fs *filesystem, inodeNum uint32) (*inode, error) {
-	if inodeNum == 0 {
-		panic("inode number 0 on ext filesystems is not possible")
-	}
-
-	inodeRecordSize := fs.sb.InodeSize()
-	var diskInode disklayout.Inode
-	if inodeRecordSize == disklayout.OldInodeSize {
-		diskInode = &disklayout.InodeOld{}
-	} else {
-		diskInode = &disklayout.InodeNew{}
-	}
-
-	// Calculate where the inode is actually placed.
-	inodesPerGrp := fs.sb.InodesPerGroup()
-	blkSize := fs.sb.BlockSize()
-	inodeTableOff := fs.bgs[getBGNum(inodeNum, inodesPerGrp)].InodeTable() * blkSize
-	inodeOff := inodeTableOff + uint64(uint32(inodeRecordSize)*getBGOff(inodeNum, inodesPerGrp))
-
-	if err := readFromDisk(fs.dev, int64(inodeOff), diskInode); err != nil {
-		return nil, err
-	}
-
-	// Build the inode based on its type.
-	inode := inode{
-		fs:        fs,
-		inodeNum:  inodeNum,
-		blkSize:   blkSize,
-		diskInode: diskInode,
-	}
-
-	switch diskInode.Mode().FileType() {
-	case linux.ModeSymlink:
-		f, err := newSymlink(inode)
-		if err != nil {
-			return nil, err
-		}
-		return &f.inode, nil
-	case linux.ModeRegular:
-		f, err := newRegularFile(inode)
-		if err != nil {
-			return nil, err
-		}
-		return &f.inode, nil
-	case linux.ModeDirectory:
-		f, err := newDirectroy(inode, fs.sb.IncompatibleFeatures().DirentFileType)
-		if err != nil {
-			return nil, err
-		}
-		return &f.inode, nil
-	default:
-		// TODO(b/134676337): Return appropriate errors for sockets, pipes and devices.
-		return nil, syserror.EINVAL
-	}
-}
-
-// open creates and returns a file description for the dentry passed in.
-func (in *inode) open(rp *vfs.ResolvingPath, vfsd *vfs.Dentry, flags uint32) (*vfs.FileDescription, error) {
-	ats := vfs.AccessTypesForOpenFlags(flags)
-	if err := in.checkPermissions(rp.Credentials(), ats); err != nil {
-		return nil, err
-	}
-	mnt := rp.Mount()
-	switch in.impl.(type) {
-	case *regularFile:
-		var fd regularFileFD
-		fd.flags = flags
-		mnt.IncRef()
-		vfsd.IncRef()
-		fd.vfsfd.Init(&fd, mnt, vfsd)
-		return &fd.vfsfd, nil
-	case *directory:
-		// Can't open directories writably. This check is not necessary for a read
-		// only filesystem but will be required when write is implemented.
-		if ats&vfs.MayWrite != 0 {
-			return nil, syserror.EISDIR
-		}
-		var fd directoryFD
-		fd.flags = flags
-		mnt.IncRef()
-		vfsd.IncRef()
-		fd.vfsfd.Init(&fd, mnt, vfsd)
-		return &fd.vfsfd, nil
-	case *symlink:
-		if flags&linux.O_PATH == 0 {
-			// Can't open symlinks without O_PATH.
-			return nil, syserror.ELOOP
-		}
-		var fd symlinkFD
-		fd.flags = flags
-		mnt.IncRef()
-		vfsd.IncRef()
-		fd.vfsfd.Init(&fd, mnt, vfsd)
-		return &fd.vfsfd, nil
-	default:
-		panic(fmt.Sprintf("unknown inode type: %T", in.impl))
-	}
-}
-
-func (in *inode) checkPermissions(creds *auth.Credentials, ats vfs.AccessTypes) error {
-	return vfs.GenericCheckPermissions(creds, ats, in.isDir(), uint16(in.diskInode.Mode()), in.diskInode.UID(), in.diskInode.GID())
-}
-
-// statTo writes the statx fields to the output parameter.
-func (in *inode) statTo(stat *linux.Statx) {
-	stat.Mask = linux.STATX_TYPE | linux.STATX_MODE | linux.STATX_NLINK |
-		linux.STATX_UID | linux.STATX_GID | linux.STATX_INO | linux.STATX_SIZE |
-		linux.STATX_ATIME | linux.STATX_CTIME | linux.STATX_MTIME
-	stat.Blksize = uint32(in.blkSize)
-	stat.Mode = uint16(in.diskInode.Mode())
-	stat.Nlink = uint32(in.diskInode.LinksCount())
-	stat.UID = uint32(in.diskInode.UID())
-	stat.GID = uint32(in.diskInode.GID())
-	stat.Ino = uint64(in.inodeNum)
-	stat.Size = in.diskInode.Size()
-	stat.Atime = in.diskInode.AccessTime().StatxTimestamp()
-	stat.Ctime = in.diskInode.ChangeTime().StatxTimestamp()
-	stat.Mtime = in.diskInode.ModificationTime().StatxTimestamp()
-	// TODO(b/134676337): Set stat.Blocks which is the number of 512 byte blocks
-	// (including metadata blocks) required to represent this file.
-}
-
-// getBGNum returns the block group number that a given inode belongs to.
-func getBGNum(inodeNum uint32, inodesPerGrp uint32) uint32 {
-	return (inodeNum - 1) / inodesPerGrp
-}
-
-// getBGOff returns the offset at which the given inode lives in the block
-// group's inode table, i.e. the index of the inode in the inode table.
-func getBGOff(inodeNum uint32, inodesPerGrp uint32) uint32 {
-	return (inodeNum - 1) % inodesPerGrp
-}