62 lines
2.0 KiB
Go
62 lines
2.0 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 disklayout
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import (
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"fmt"
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"gvisor.dev/gvisor/pkg/sentry/fs"
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)
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// DirentNew represents the ext4 directory entry struct. This emulates Linux's
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// ext4_dir_entry_2 struct. The FileName can not be more than 255 bytes so we
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// only need 8 bits to store the NameLength. As a result, NameLength has been
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// shortened and the other 8 bits are used to encode the file type. Use the
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// FileTypeRaw field only if the SbDirentFileType feature is set.
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//
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// Note: This struct can be of variable size on disk. The one described below
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// is of maximum size and the FileName beyond NameLength bytes might contain
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// garbage.
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type DirentNew struct {
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InodeNumber uint32
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RecordLength uint16
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NameLength uint8
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FileTypeRaw uint8
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FileNameRaw [MaxFileName]byte
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}
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// Compiles only if DirentNew implements Dirent.
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var _ Dirent = (*DirentNew)(nil)
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// Inode implements Dirent.Inode.
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func (d *DirentNew) Inode() uint32 { return d.InodeNumber }
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// RecordSize implements Dirent.RecordSize.
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func (d *DirentNew) RecordSize() uint16 { return d.RecordLength }
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// FileName implements Dirent.FileName.
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func (d *DirentNew) FileName() string {
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return string(d.FileNameRaw[:d.NameLength])
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}
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// FileType implements Dirent.FileType.
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func (d *DirentNew) FileType() (fs.InodeType, bool) {
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if inodeType, ok := inodeTypeByFileType[d.FileTypeRaw]; ok {
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return inodeType, true
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}
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panic(fmt.Sprintf("unknown file type %v", d.FileTypeRaw))
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}
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