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// 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 anon implements an anonymous inode, useful for implementing
// inodes for pseudo filesystems.
package anon
import (
"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"
"gvisor.googlesource.com/gvisor/pkg/sentry/usermem"
)
// NewInode constructs an anonymous Inode that is not associated
// with any real filesystem. Some types depend on completely pseudo
// "anon" inodes (eventfds, epollfds, etc).
func NewInode(ctx context.Context) *fs.Inode {
return fs.NewInode(fsutil.NewSimpleInodeOperations(fsutil.InodeSimpleAttributes{
FSType: linux.ANON_INODE_FS_MAGIC,
UAttr: fs.WithCurrentTime(ctx, fs.UnstableAttr{
Owner: fs.FileOwnerFromContext(ctx),
Perms: fs.FilePermissions{
User: fs.PermMask{Read: true, Write: true},
},
Links: 1,
}),
}), fs.NewNonCachingMountSource(nil, fs.MountSourceFlags{}), fs.StableAttr{
Type: fs.Anonymous,
DeviceID: PseudoDevice.DeviceID(),
InodeID: PseudoDevice.NextIno(),
BlockSize: usermem.PageSize,
})
}
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