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// 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 fuse
import (
"sync/atomic"
"gvisor.dev/gvisor/pkg/abi/linux"
"gvisor.dev/gvisor/pkg/context"
"gvisor.dev/gvisor/pkg/errors/linuxerr"
"gvisor.dev/gvisor/pkg/sentry/kernel"
"gvisor.dev/gvisor/pkg/sentry/kernel/auth"
"gvisor.dev/gvisor/pkg/sentry/vfs"
"gvisor.dev/gvisor/pkg/usermem"
)
type directoryFD struct {
fileDescription
}
// Allocate implements directoryFD.Allocate.
func (*directoryFD) Allocate(ctx context.Context, mode, offset, length uint64) error {
return linuxerr.EISDIR
}
// PRead implements vfs.FileDescriptionImpl.PRead.
func (*directoryFD) PRead(ctx context.Context, dst usermem.IOSequence, offset int64, opts vfs.ReadOptions) (int64, error) {
return 0, linuxerr.EISDIR
}
// Read implements vfs.FileDescriptionImpl.Read.
func (*directoryFD) Read(ctx context.Context, dst usermem.IOSequence, opts vfs.ReadOptions) (int64, error) {
return 0, linuxerr.EISDIR
}
// PWrite implements vfs.FileDescriptionImpl.PWrite.
func (*directoryFD) PWrite(ctx context.Context, src usermem.IOSequence, offset int64, opts vfs.WriteOptions) (int64, error) {
return 0, linuxerr.EISDIR
}
// Write implements vfs.FileDescriptionImpl.Write.
func (*directoryFD) Write(ctx context.Context, src usermem.IOSequence, opts vfs.WriteOptions) (int64, error) {
return 0, linuxerr.EISDIR
}
// IterDirents implements vfs.FileDescriptionImpl.IterDirents.
func (dir *directoryFD) IterDirents(ctx context.Context, callback vfs.IterDirentsCallback) error {
fusefs := dir.inode().fs
task, creds := kernel.TaskFromContext(ctx), auth.CredentialsFromContext(ctx)
in := linux.FUSEReadIn{
Fh: dir.Fh,
Offset: uint64(atomic.LoadInt64(&dir.off)),
Size: linux.FUSE_PAGE_SIZE,
Flags: dir.statusFlags(),
}
// TODO(gVisor.dev/issue/3404): Support FUSE_READDIRPLUS.
req := fusefs.conn.NewRequest(creds, uint32(task.ThreadID()), dir.inode().nodeID, linux.FUSE_READDIR, &in)
res, err := fusefs.conn.Call(task, req)
if err != nil {
return err
}
if err := res.Error(); err != nil {
return err
}
var out linux.FUSEDirents
if err := res.UnmarshalPayload(&out); err != nil {
return err
}
for _, fuseDirent := range out.Dirents {
nextOff := int64(fuseDirent.Meta.Off)
dirent := vfs.Dirent{
Name: fuseDirent.Name,
Type: uint8(fuseDirent.Meta.Type),
Ino: fuseDirent.Meta.Ino,
NextOff: nextOff,
}
if err := callback.Handle(dirent); err != nil {
return err
}
atomic.StoreInt64(&dir.off, nextOff)
}
return nil
}
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