1 files changed, 0 insertions, 159 deletions
diff --git a/pkg/sentry/fsimpl/gofer/special_file.go b/pkg/sentry/fsimpl/gofer/special_file.go
deleted file mode 100644
index 08c691c47..000000000
--- a/pkg/sentry/fsimpl/gofer/special_file.go
+++ /dev/null
@@ -1,159 +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"
-
-	"gvisor.dev/gvisor/pkg/abi/linux"
-	"gvisor.dev/gvisor/pkg/context"
-	"gvisor.dev/gvisor/pkg/safemem"
-	"gvisor.dev/gvisor/pkg/sentry/vfs"
-	"gvisor.dev/gvisor/pkg/syserror"
-	"gvisor.dev/gvisor/pkg/usermem"
-)
-
-// specialFileFD implements vfs.FileDescriptionImpl for files other than
-// regular files, directories, and symlinks: pipes, sockets, etc. It is also
-// used for regular files when filesystemOptions.specialRegularFiles is in
-// effect. specialFileFD differs from regularFileFD by using per-FD handles
-// instead of shared per-dentry handles, and never buffering I/O.
-type specialFileFD struct {
-	fileDescription
-
-	// handle is immutable.
-	handle handle
-
-	// off is the file offset. off is protected by mu. (POSIX 2.9.7 only
-	// requires operations using the file offset to be atomic for regular files
-	// and symlinks; however, since specialFileFD may be used for regular
-	// files, we apply this atomicity unconditionally.)
-	mu  sync.Mutex
-	off int64
-}
-
-// Release implements vfs.FileDescriptionImpl.Release.
-func (fd *specialFileFD) Release() {
-	fd.handle.close(context.Background())
-	fs := fd.vfsfd.Mount().Filesystem().Impl().(*filesystem)
-	fs.syncMu.Lock()
-	delete(fs.specialFileFDs, fd)
-	fs.syncMu.Unlock()
-}
-
-// OnClose implements vfs.FileDescriptionImpl.OnClose.
-func (fd *specialFileFD) OnClose(ctx context.Context) error {
-	if !fd.vfsfd.IsWritable() {
-		return nil
-	}
-	return fd.handle.file.flush(ctx)
-}
-
-// PRead implements vfs.FileDescriptionImpl.PRead.
-func (fd *specialFileFD) PRead(ctx context.Context, dst usermem.IOSequence, offset int64, opts vfs.ReadOptions) (int64, error) {
-	if offset < 0 {
-		return 0, syserror.EINVAL
-	}
-	if opts.Flags != 0 {
-		return 0, syserror.EOPNOTSUPP
-	}
-
-	// Going through dst.CopyOutFrom() holds MM locks around file operations of
-	// unknown duration. For regularFileFD, doing so is necessary to support
-	// mmap due to lock ordering; MM locks precede dentry.dataMu. That doesn't
-	// hold here since specialFileFD doesn't client-cache data. Just buffer the
-	// read instead.
-	if d := fd.dentry(); d.fs.opts.interop != InteropModeShared {
-		d.touchAtime(ctx, fd.vfsfd.Mount())
-	}
-	buf := make([]byte, dst.NumBytes())
-	n, err := fd.handle.readToBlocksAt(ctx, safemem.BlockSeqOf(safemem.BlockFromSafeSlice(buf)), uint64(offset))
-	if n == 0 {
-		return 0, err
-	}
-	if cp, cperr := dst.CopyOut(ctx, buf[:n]); cperr != nil {
-		return int64(cp), cperr
-	}
-	return int64(n), err
-}
-
-// Read implements vfs.FileDescriptionImpl.Read.
-func (fd *specialFileFD) Read(ctx context.Context, dst usermem.IOSequence, opts vfs.ReadOptions) (int64, error) {
-	fd.mu.Lock()
-	n, err := fd.PRead(ctx, dst, fd.off, opts)
-	fd.off += n
-	fd.mu.Unlock()
-	return n, err
-}
-
-// PWrite implements vfs.FileDescriptionImpl.PWrite.
-func (fd *specialFileFD) PWrite(ctx context.Context, src usermem.IOSequence, offset int64, opts vfs.WriteOptions) (int64, error) {
-	if offset < 0 {
-		return 0, syserror.EINVAL
-	}
-	if opts.Flags != 0 {
-		return 0, syserror.EOPNOTSUPP
-	}
-
-	// Do a buffered write. See rationale in PRead.
-	if d := fd.dentry(); d.fs.opts.interop != InteropModeShared {
-		d.touchCMtime(ctx)
-	}
-	buf := make([]byte, src.NumBytes())
-	// Don't do partial writes if we get a partial read from src.
-	if _, err := src.CopyIn(ctx, buf); err != nil {
-		return 0, err
-	}
-	n, err := fd.handle.writeFromBlocksAt(ctx, safemem.BlockSeqOf(safemem.BlockFromSafeSlice(buf)), uint64(offset))
-	return int64(n), err
-}
-
-// Write implements vfs.FileDescriptionImpl.Write.
-func (fd *specialFileFD) Write(ctx context.Context, src usermem.IOSequence, opts vfs.WriteOptions) (int64, error) {
-	fd.mu.Lock()
-	n, err := fd.PWrite(ctx, src, fd.off, opts)
-	fd.off += n
-	fd.mu.Unlock()
-	return n, err
-}
-
-// Seek implements vfs.FileDescriptionImpl.Seek.
-func (fd *specialFileFD) Seek(ctx context.Context, offset int64, whence int32) (int64, error) {
-	fd.mu.Lock()
-	defer fd.mu.Unlock()
-	switch whence {
-	case linux.SEEK_SET:
-		// Use offset as given.
-	case linux.SEEK_CUR:
-		offset += fd.off
-	default:
-		// SEEK_END, SEEK_DATA, and SEEK_HOLE aren't supported since it's not
-		// clear that file size is even meaningful for these files.
-		return 0, syserror.EINVAL
-	}
-	if offset < 0 {
-		return 0, syserror.EINVAL
-	}
-	fd.off = offset
-	return offset, nil
-}
-
-// Sync implements vfs.FileDescriptionImpl.Sync.
-func (fd *specialFileFD) Sync(ctx context.Context) error {
-	if !fd.vfsfd.IsWritable() {
-		return nil
-	}
-	return fd.handle.sync(ctx)
-}