50 lines
1.7 KiB
Go
50 lines
1.7 KiB
Go
// Copyright 2018 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 host
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import (
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"fmt"
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"syscall"
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"gvisor.dev/gvisor/pkg/sentry/device"
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"gvisor.dev/gvisor/pkg/sentry/fs"
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)
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// afterLoad is invoked by stateify.
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func (i *inodeFileState) afterLoad() {
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// Initialize the descriptor value.
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if err := i.descriptor.initAfterLoad(i.sattr.InodeID, &i.queue); err != nil {
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panic(fmt.Sprintf("failed to load value of descriptor: %v", err))
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}
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// Remap the inode number.
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var s syscall.Stat_t
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if err := syscall.Fstat(i.FD(), &s); err != nil {
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panic(fs.ErrCorruption{fmt.Errorf("failed to get metadata for fd %d: %v", i.FD(), err)})
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}
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key := device.MultiDeviceKey{
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Device: s.Dev,
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Inode: s.Ino,
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}
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if !hostFileDevice.Load(key, i.sattr.InodeID) {
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// This means there was a conflict at s.Dev and s.Ino with
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// another inode mapping: two files that were unique on the
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// saved filesystem are no longer unique on this filesystem.
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// Since this violates the contract that filesystems cannot
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// change across save and restore, error out.
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panic(fs.ErrCorruption{fmt.Errorf("host %s conflict in host device mappings: %s", key, hostFileDevice)})
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}
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}
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