1 files changed, 0 insertions, 247 deletions
diff --git a/pkg/sentry/fsimpl/host/default_file.go b/pkg/sentry/fsimpl/host/default_file.go
deleted file mode 100644
index 459238603..000000000
--- a/pkg/sentry/fsimpl/host/default_file.go
+++ /dev/null
@@ -1,247 +0,0 @@
-// Copyright 2020 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 host
-
-import (
-	"math"
-	"syscall"
-
-	"golang.org/x/sys/unix"
-	"gvisor.dev/gvisor/pkg/abi/linux"
-	"gvisor.dev/gvisor/pkg/context"
-	"gvisor.dev/gvisor/pkg/fd"
-	"gvisor.dev/gvisor/pkg/safemem"
-	"gvisor.dev/gvisor/pkg/sentry/memmap"
-	"gvisor.dev/gvisor/pkg/sentry/vfs"
-	"gvisor.dev/gvisor/pkg/sync"
-	"gvisor.dev/gvisor/pkg/syserror"
-	"gvisor.dev/gvisor/pkg/usermem"
-)
-
-// defaultFileFD implements FileDescriptionImpl for non-socket, non-TTY files.
-type defaultFileFD struct {
-	fileDescription
-
-	// canMap specifies whether we allow the file to be memory mapped.
-	canMap bool
-
-	// mu protects the fields below.
-	mu sync.Mutex
-
-	// offset specifies the current file offset.
-	offset int64
-}
-
-// TODO(gvisor.dev/issue/1672): Implement Waitable interface.
-
-// PRead implements FileDescriptionImpl.
-func (f *defaultFileFD) PRead(ctx context.Context, dst usermem.IOSequence, offset int64, opts vfs.ReadOptions) (int64, error) {
-	// TODO(b/34716638): Some char devices do support offsets, e.g. /dev/null.
-	if f.inode.isStream {
-		return 0, syserror.ESPIPE
-	}
-
-	return readFromHostFD(ctx, f.inode.hostFD, dst, offset, int(opts.Flags))
-}
-
-// Read implements FileDescriptionImpl.
-func (f *defaultFileFD) Read(ctx context.Context, dst usermem.IOSequence, opts vfs.ReadOptions) (int64, error) {
-	// TODO(b/34716638): Some char devices do support offsets, e.g. /dev/null.
-	if f.inode.isStream {
-		// These files can't be memory mapped, assert this.
-		if f.canMap {
-			panic("files that can return EWOULDBLOCK (sockets, pipes, etc.) cannot be memory mapped")
-		}
-
-		n, err := readFromHostFD(ctx, f.inode.hostFD, dst, -1, int(opts.Flags))
-		if isBlockError(err) {
-			// If we got any data at all, return it as a "completed" partial read
-			// rather than retrying until complete.
-			if n != 0 {
-				err = nil
-			} else {
-				err = syserror.ErrWouldBlock
-			}
-		}
-		return n, err
-	}
-	// TODO(gvisor.dev/issue/1672): Cache pages, when forced to do so.
-	f.mu.Lock()
-	n, err := readFromHostFD(ctx, f.inode.hostFD, dst, f.offset, int(opts.Flags))
-	f.offset += n
-	f.mu.Unlock()
-	return n, err
-}
-
-func readFromHostFD(ctx context.Context, hostFD int, dst usermem.IOSequence, offset int64, flags int) (int64, error) {
-	// TODO(gvisor.dev/issue/1672): Support select preadv2 flags.
-	if flags != 0 {
-		return 0, syserror.EOPNOTSUPP
-	}
-
-	var reader safemem.Reader
-	if offset == -1 {
-		reader = safemem.FromIOReader{fd.NewReadWriter(hostFD)}
-	} else {
-		reader = safemem.FromVecReaderFunc{
-			func(srcs [][]byte) (int64, error) {
-				n, err := unix.Preadv(hostFD, srcs, offset)
-				return int64(n), err
-			},
-		}
-	}
-	n, err := dst.CopyOutFrom(ctx, reader)
-	return int64(n), err
-}
-
-// PWrite implements FileDescriptionImpl.
-func (f *defaultFileFD) PWrite(ctx context.Context, src usermem.IOSequence, offset int64, opts vfs.WriteOptions) (int64, error) {
-	// TODO(b/34716638): Some char devices do support offsets, e.g. /dev/null.
-	if f.inode.isStream {
-		return 0, syserror.ESPIPE
-	}
-	return writeToHostFD(ctx, f.inode.hostFD, src, offset, int(opts.Flags))
-}
-
-// Write implements FileDescriptionImpl.
-func (f *defaultFileFD) Write(ctx context.Context, src usermem.IOSequence, opts vfs.WriteOptions) (int64, error) {
-	// TODO(b/34716638): Some char devices do support offsets, e.g. /dev/null.
-	if f.inode.isStream {
-		// These files can't be memory mapped, assert this.
-		if f.canMap {
-			panic("files that can return EWOULDBLOCK (sockets, pipes, etc.) cannot be memory mapped")
-		}
-
-		n, err := writeToHostFD(ctx, f.inode.hostFD, src, -1, int(opts.Flags))
-		if isBlockError(err) {
-			err = syserror.ErrWouldBlock
-		}
-		return n, err
-	}
-	// TODO(gvisor.dev/issue/1672): Cache pages, when forced to do so.
-	// TODO(gvisor.dev/issue/1672): Write to end of file and update offset if O_APPEND is set on this file.
-	f.mu.Lock()
-	n, err := writeToHostFD(ctx, f.inode.hostFD, src, f.offset, int(opts.Flags))
-	f.offset += n
-	f.mu.Unlock()
-	return n, err
-}
-
-func writeToHostFD(ctx context.Context, hostFD int, src usermem.IOSequence, offset int64, flags int) (int64, error) {
-	// TODO(gvisor.dev/issue/1672): Support select pwritev2 flags.
-	if flags != 0 {
-		return 0, syserror.EOPNOTSUPP
-	}
-
-	limit, err := vfs.CheckLimit(ctx, offset, src.NumBytes())
-	if err != nil {
-		return 0, err
-	}
-	src = src.TakeFirst64(limit)
-
-	var writer safemem.Writer
-	if offset == -1 {
-		writer = safemem.FromIOWriter{fd.NewReadWriter(hostFD)}
-	} else {
-		writer = safemem.FromVecWriterFunc{
-			func(srcs [][]byte) (int64, error) {
-				n, err := unix.Pwritev(hostFD, srcs, offset)
-				return int64(n), err
-			},
-		}
-	}
-	n, err := src.CopyInTo(ctx, writer)
-	return int64(n), err
-}
-
-// Seek implements FileDescriptionImpl.
-//
-// Note that we do not support seeking on directories, since we do not even
-// allow directory fds to be imported at all.
-func (f *defaultFileFD) Seek(_ context.Context, offset int64, whence int32) (int64, error) {
-	// TODO(b/34716638): Some char devices do support seeking, e.g. /dev/null.
-	if f.inode.isStream {
-		return 0, syserror.ESPIPE
-	}
-
-	f.mu.Lock()
-	defer f.mu.Unlock()
-
-	switch whence {
-	case linux.SEEK_SET:
-		if offset < 0 {
-			return f.offset, syserror.EINVAL
-		}
-		f.offset = offset
-
-	case linux.SEEK_CUR:
-		// Check for overflow. Note that underflow cannot occur, since f.offset >= 0.
-		if offset > math.MaxInt64-f.offset {
-			return f.offset, syserror.EOVERFLOW
-		}
-		if f.offset+offset < 0 {
-			return f.offset, syserror.EINVAL
-		}
-		f.offset += offset
-
-	case linux.SEEK_END:
-		var s syscall.Stat_t
-		if err := syscall.Fstat(f.inode.hostFD, &s); err != nil {
-			return f.offset, err
-		}
-		size := s.Size
-
-		// Check for overflow. Note that underflow cannot occur, since size >= 0.
-		if offset > math.MaxInt64-size {
-			return f.offset, syserror.EOVERFLOW
-		}
-		if size+offset < 0 {
-			return f.offset, syserror.EINVAL
-		}
-		f.offset = size + offset
-
-	case linux.SEEK_DATA, linux.SEEK_HOLE:
-		// Modifying the offset in the host file table should not matter, since
-		// this is the only place where we use it.
-		//
-		// For reading and writing, we always rely on our internal offset.
-		n, err := unix.Seek(f.inode.hostFD, offset, int(whence))
-		if err != nil {
-			return f.offset, err
-		}
-		f.offset = n
-
-	default:
-		// Invalid whence.
-		return f.offset, syserror.EINVAL
-	}
-
-	return f.offset, nil
-}
-
-// Sync implements FileDescriptionImpl.
-func (f *defaultFileFD) Sync(context.Context) error {
-	// TODO(gvisor.dev/issue/1672): Currently we do not support the SyncData optimization, so we always sync everything.
-	return unix.Fsync(f.inode.hostFD)
-}
-
-// ConfigureMMap implements FileDescriptionImpl.
-func (f *defaultFileFD) ConfigureMMap(_ context.Context, opts *memmap.MMapOpts) error {
-	if !f.canMap {
-		return syserror.ENODEV
-	}
-	// TODO(gvisor.dev/issue/1672): Implement ConfigureMMap and Mappable interface.
-	return syserror.ENODEV
-}