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// Copyright 2018 Google Inc.
//
// 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 tty
import (
"sync"
"gvisor.googlesource.com/gvisor/pkg/abi/linux"
"gvisor.googlesource.com/gvisor/pkg/sentry/context"
"gvisor.googlesource.com/gvisor/pkg/sentry/fs"
"gvisor.googlesource.com/gvisor/pkg/sentry/fs/fsutil"
ktime "gvisor.googlesource.com/gvisor/pkg/sentry/kernel/time"
"gvisor.googlesource.com/gvisor/pkg/syserror"
)
// inodeOperations are the base fs.InodeOperations for master and slave Inodes.
//
// inodeOperations does not implement:
//
// * fs.InodeOperations.Release
// * fs.InodeOperations.GetFile
type inodeOperations struct {
fsutil.DeprecatedFileOperations `state:"nosave"`
fsutil.InodeNoExtendedAttributes `state:"nosave"`
fsutil.InodeNotDirectory `state:"nosave"`
fsutil.InodeNotRenameable `state:"nosave"`
fsutil.InodeNotSocket `state:"nosave"`
fsutil.InodeNotSymlink `state:"nosave"`
fsutil.NoMappable `state:"nosave"`
fsutil.NoopWriteOut `state:"nosave"`
// mu protects the fields below.
mu sync.Mutex `state:"nosave"`
// uattr is the inode's UnstableAttr.
uattr fs.UnstableAttr
}
// UnstableAttr implements fs.InodeOperations.UnstableAttr.
func (i *inodeOperations) UnstableAttr(ctx context.Context, inode *fs.Inode) (fs.UnstableAttr, error) {
i.mu.Lock()
defer i.mu.Unlock()
return i.uattr, nil
}
// Check implements fs.InodeOperations.Check.
func (i *inodeOperations) Check(ctx context.Context, inode *fs.Inode, p fs.PermMask) bool {
return fs.ContextCanAccessFile(ctx, inode, p)
}
// SetPermissions implements fs.InodeOperations.SetPermissions
func (i *inodeOperations) SetPermissions(ctx context.Context, inode *fs.Inode, p fs.FilePermissions) bool {
i.mu.Lock()
defer i.mu.Unlock()
i.uattr.Perms = p
i.uattr.StatusChangeTime = ktime.NowFromContext(ctx)
return true
}
// SetOwner implements fs.InodeOperations.SetOwner.
func (i *inodeOperations) SetOwner(ctx context.Context, inode *fs.Inode, owner fs.FileOwner) error {
i.mu.Lock()
defer i.mu.Unlock()
if owner.UID.Ok() {
i.uattr.Owner.UID = owner.UID
}
if owner.GID.Ok() {
i.uattr.Owner.GID = owner.GID
}
return nil
}
// SetTimestamps implements fs.InodeOperations.SetTimestamps.
func (i *inodeOperations) SetTimestamps(ctx context.Context, inode *fs.Inode, ts fs.TimeSpec) error {
if ts.ATimeOmit && ts.MTimeOmit {
return nil
}
i.mu.Lock()
defer i.mu.Unlock()
now := ktime.NowFromContext(ctx)
if !ts.ATimeOmit {
if ts.ATime.IsZero() {
i.uattr.AccessTime = now
} else {
i.uattr.AccessTime = ts.ATime
}
}
if !ts.MTimeOmit {
if ts.MTime.IsZero() {
i.uattr.ModificationTime = now
} else {
i.uattr.ModificationTime = ts.MTime
}
}
i.uattr.StatusChangeTime = now
return nil
}
// Truncate implements fs.InodeOperations.Truncate.
func (i *inodeOperations) Truncate(ctx context.Context, inode *fs.Inode, size int64) error {
return syserror.EINVAL
}
// AddLink implements fs.InodeOperations.AddLink.
func (i *inodeOperations) AddLink() {
}
// DropLink implements fs.InodeOperations.DropLink.
func (i *inodeOperations) DropLink() {
}
// NotifyStatusChange implements fs.InodeOperations.NotifyStatusChange.
func (i *inodeOperations) NotifyStatusChange(ctx context.Context) {
i.mu.Lock()
defer i.mu.Unlock()
i.uattr.StatusChangeTime = ktime.NowFromContext(ctx)
}
// IsVirtual implements fs.InodeOperations.IsVirtual.
func (i *inodeOperations) IsVirtual() bool {
return true
}
// StatFS implements fs.InodeOperations.StatFS.
func (i *inodeOperations) StatFS(ctx context.Context) (fs.Info, error) {
return fs.Info{
Type: linux.DEVPTS_SUPER_MAGIC,
}, nil
}
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