118 lines
3.4 KiB
Go
118 lines
3.4 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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"gvisor.dev/gvisor/pkg/abi/linux"
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"gvisor.dev/gvisor/pkg/sentry/kernel/auth"
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"gvisor.dev/gvisor/pkg/sentry/kernel/time"
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)
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const (
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// oldInodeSize is the inode size in ext2/ext3.
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oldInodeSize = 128
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)
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// InodeOld implements Inode interface. It emulates ext2/ext3 inode struct.
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// Inode struct size and record size are both 128 bytes for this.
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//
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// All fields representing time are in seconds since the epoch. Which means that
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// they will overflow in January 2038.
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type InodeOld struct {
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ModeRaw uint16
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UIDLo uint16
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SizeLo uint32
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// The time fields are signed integers because they could be negative to
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// represent time before the epoch.
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AccessTimeRaw int32
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ChangeTimeRaw int32
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ModificationTimeRaw int32
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DeletionTimeRaw int32
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GIDLo uint16
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LinksCountRaw uint16
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BlocksCountLo uint32
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FlagsRaw uint32
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VersionLo uint32 // This is OS dependent.
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BlocksRaw [60]byte
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Generation uint32
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FileACLLo uint32
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SizeHi uint32
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ObsoFaddr uint32
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// OS dependent fields have been inlined here.
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BlocksCountHi uint16
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FileACLHi uint16
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UIDHi uint16
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GIDHi uint16
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ChecksumLo uint16
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_ uint16
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}
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// Compiles only if InodeOld implements Inode.
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var _ Inode = (*InodeOld)(nil)
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// Mode implements Inode.Mode.
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func (in *InodeOld) Mode() linux.FileMode { return linux.FileMode(in.ModeRaw) }
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// UID implements Inode.UID.
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func (in *InodeOld) UID() auth.KUID {
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return auth.KUID((uint32(in.UIDHi) << 16) | uint32(in.UIDLo))
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}
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// GID implements Inode.GID.
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func (in *InodeOld) GID() auth.KGID {
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return auth.KGID((uint32(in.GIDHi) << 16) | uint32(in.GIDLo))
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}
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// Size implements Inode.Size.
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func (in *InodeOld) Size() uint64 {
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// In ext2/ext3, in.SizeHi did not exist, it was instead named in.DirACL.
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return uint64(in.SizeLo)
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}
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// InodeSize implements Inode.InodeSize.
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func (in *InodeOld) InodeSize() uint16 { return oldInodeSize }
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// AccessTime implements Inode.AccessTime.
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func (in *InodeOld) AccessTime() time.Time {
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return time.FromUnix(int64(in.AccessTimeRaw), 0)
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}
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// ChangeTime implements Inode.ChangeTime.
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func (in *InodeOld) ChangeTime() time.Time {
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return time.FromUnix(int64(in.ChangeTimeRaw), 0)
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}
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// ModificationTime implements Inode.ModificationTime.
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func (in *InodeOld) ModificationTime() time.Time {
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return time.FromUnix(int64(in.ModificationTimeRaw), 0)
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}
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// DeletionTime implements Inode.DeletionTime.
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func (in *InodeOld) DeletionTime() time.Time {
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return time.FromUnix(int64(in.DeletionTimeRaw), 0)
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}
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// LinksCount implements Inode.LinksCount.
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func (in *InodeOld) LinksCount() uint16 { return in.LinksCountRaw }
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// Flags implements Inode.Flags.
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func (in *InodeOld) Flags() InodeFlags { return InodeFlagsFromInt(in.FlagsRaw) }
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// Blocks implements Inode.Blocks.
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func (in *InodeOld) Blocks() [60]byte { return in.BlocksRaw }
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