60 lines
1.8 KiB
Go
60 lines
1.8 KiB
Go
// Copyright 2019 The gVisor Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package tmpfs
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import (
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"gvisor.dev/gvisor/pkg/abi/linux"
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"gvisor.dev/gvisor/pkg/context"
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"gvisor.dev/gvisor/pkg/sentry/kernel/auth"
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"gvisor.dev/gvisor/pkg/sentry/kernel/pipe"
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"gvisor.dev/gvisor/pkg/sentry/vfs"
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"gvisor.dev/gvisor/pkg/usermem"
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)
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type namedPipe struct {
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inode inode
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pipe *pipe.VFSPipe
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}
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// Preconditions:
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// * fs.mu must be locked.
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// * rp.Mount().CheckBeginWrite() has been called successfully.
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func (fs *filesystem) newNamedPipe(creds *auth.Credentials, mode linux.FileMode) *inode {
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file := &namedPipe{pipe: pipe.NewVFSPipe(pipe.DefaultPipeSize, usermem.PageSize)}
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file.inode.init(file, fs, creds, linux.S_IFIFO|mode)
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file.inode.nlink = 1 // Only the parent has a link.
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return &file.inode
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}
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// namedPipeFD implements vfs.FileDescriptionImpl. Methods are implemented
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// entirely via struct embedding.
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type namedPipeFD struct {
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fileDescription
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*pipe.VFSPipeFD
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}
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func newNamedPipeFD(ctx context.Context, np *namedPipe, rp *vfs.ResolvingPath, vfsd *vfs.Dentry, flags uint32) (*vfs.FileDescription, error) {
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var err error
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var fd namedPipeFD
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fd.VFSPipeFD, err = np.pipe.NewVFSPipeFD(ctx, vfsd, &fd.vfsfd, flags)
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if err != nil {
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return nil, err
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}
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fd.vfsfd.Init(&fd, flags, rp.Mount(), vfsd, &vfs.FileDescriptionOptions{})
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return &fd.vfsfd, nil
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}
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