Remove fs.Handle, ramfs.Entry, and all the DeprecatedFileOperations.

More helper structs have been added to the fsutil package to make it easier to
implement fs.InodeOperations and fs.FileOperations.

PiperOrigin-RevId: 229305982
Change-Id: Ib6f8d3862f4216745116857913dbfa351530223b

1 files changed, 0 insertions, 150 deletions

diff --git a/pkg/sentry/fs/ramfs/file.go b/pkg/sentry/fs/ramfs/file.go
deleted file mode 100644
index b7fc98ffc..000000000
--- a/pkg/sentry/fs/ramfs/file.go
+++ /dev/null
@@ -1,150 +0,0 @@
-// Copyright 2018 Google LLC
-//
-// 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 ramfs
-
-import (
-	"io"
-	"sync"
-
-	"gvisor.googlesource.com/gvisor/pkg/secio"
-	"gvisor.googlesource.com/gvisor/pkg/sentry/context"
-	"gvisor.googlesource.com/gvisor/pkg/sentry/fs"
-	"gvisor.googlesource.com/gvisor/pkg/sentry/safemem"
-	"gvisor.googlesource.com/gvisor/pkg/sentry/usermem"
-	"gvisor.googlesource.com/gvisor/pkg/syserror"
-)
-
-// File represents a unique file.  It uses a simple byte slice as storage, and
-// thus should only be used for small files.
-//
-// A File is not mappable.
-//
-// +stateify savable
-type File struct {
-	Entry
-
-	// mu protects the fields below.
-	mu sync.Mutex `state:"nosave"`
-
-	// data tracks backing data for the file.
-	data []byte
-}
-
-// InitFile initializes a file.
-func (f *File) InitFile(ctx context.Context, owner fs.FileOwner, perms fs.FilePermissions) {
-	f.InitEntry(ctx, owner, perms)
-}
-
-// UnstableAttr returns unstable attributes of this ramfs file.
-func (f *File) UnstableAttr(ctx context.Context, inode *fs.Inode) (fs.UnstableAttr, error) {
-	f.mu.Lock()
-	defer f.mu.Unlock()
-
-	uattr, _ := f.Entry.UnstableAttr(ctx, inode)
-	uattr.Size = int64(len(f.data))
-	uattr.Usage = f.usageLocked()
-
-	return uattr, nil
-}
-
-// usageLocked returns the disk usage. Caller must hold f.mu.
-func (f *File) usageLocked() int64 {
-	return int64(len(f.data))
-}
-
-// Append appends the given data. This is for internal use.
-func (f *File) Append(data []byte) {
-	f.mu.Lock()
-	defer f.mu.Unlock()
-	f.data = append(f.data, data...)
-}
-
-// Truncate truncates this node.
-func (f *File) Truncate(ctx context.Context, inode *fs.Inode, l int64) error {
-	f.mu.Lock()
-	defer f.mu.Unlock()
-	if l < int64(len(f.data)) {
-		// Remove excess bytes.
-		f.data = f.data[:l]
-		return nil
-	} else if l > int64(len(f.data)) {
-		// Create a new slice with size l, and copy f.data into it.
-		d := make([]byte, l)
-		copy(d, f.data)
-		f.data = d
-	}
-	f.Entry.NotifyModification(ctx)
-	return nil
-}
-
-// ReadAt implements io.ReaderAt.
-func (f *File) ReadAt(data []byte, offset int64) (int, error) {
-	if offset < 0 {
-		return 0, ErrInvalidOp
-	}
-	if offset >= int64(len(f.data)) {
-		return 0, io.EOF
-	}
-	n := copy(data, f.data[offset:])
-	// Did we read past the end?
-	if offset+int64(len(data)) >= int64(len(f.data)) {
-		return n, io.EOF
-	}
-	return n, nil
-}
-
-// DeprecatedPreadv reads into a collection of slices from a given offset.
-func (f *File) DeprecatedPreadv(ctx context.Context, dst usermem.IOSequence, offset int64) (int64, error) {
-	f.mu.Lock()
-	defer f.mu.Unlock()
-	if offset >= int64(len(f.data)) {
-		return 0, io.EOF
-	}
-	n, err := dst.CopyOut(ctx, f.data[offset:])
-	if n > 0 {
-		f.Entry.NotifyAccess(ctx)
-	}
-	return int64(n), err
-}
-
-// WriteAt implements io.WriterAt.
-func (f *File) WriteAt(data []byte, offset int64) (int, error) {
-	if offset < 0 {
-		return 0, ErrInvalidOp
-	}
-	newLen := offset + int64(len(data))
-	if newLen < 0 {
-		// Overflow.
-		return 0, syserror.EINVAL
-	}
-	if newLen > int64(len(f.data)) {
-		// Copy f.data into new slice with expanded length.
-		d := make([]byte, newLen)
-		copy(d, f.data)
-		f.data = d
-	}
-	return copy(f.data[offset:], data), nil
-}
-
-// DeprecatedPwritev writes from a collection of slices at a given offset.
-func (f *File) DeprecatedPwritev(ctx context.Context, src usermem.IOSequence, offset int64) (int64, error) {
-	f.mu.Lock()
-	defer f.mu.Unlock()
-	n, err := src.CopyInTo(ctx, safemem.FromIOWriter{secio.NewOffsetWriter(f, offset)})
-	if n > 0 {
-		f.Entry.NotifyModification(ctx)
-	}
-	return n, err
-}