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// Copyright 2018 The gVisor Authors.
//
// 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 gofer
import (
"fmt"
"gvisor.dev/gvisor/pkg/p9"
"gvisor.dev/gvisor/pkg/sentry/context"
"gvisor.dev/gvisor/pkg/sentry/fs"
"gvisor.dev/gvisor/pkg/unet"
)
// beforeSave is invoked by stateify.
func (s *session) beforeSave() {
if s.endpoints != nil {
if err := s.fillPathMap(); err != nil {
panic("failed to save paths to endpoint map before saving" + err.Error())
}
}
}
// afterLoad is invoked by stateify.
func (s *session) afterLoad() {
// The restore environment contains the 9p connection of this mount.
fsys := filesystem{}
env, ok := fs.CurrentRestoreEnvironment()
if !ok {
panic("failed to find restore environment")
}
mounts, ok := env.MountSources[fsys.Name()]
if !ok {
panic("failed to find mounts for filesystem type " + fsys.Name())
}
var args fs.MountArgs
var found bool
for _, mount := range mounts {
if mount.Dev == s.connID {
args = mount
found = true
}
}
if !found {
panic(fmt.Sprintf("no connection for connection id %q", s.connID))
}
// Validate the mount flags and options.
opts, err := options(args.DataString)
if err != nil {
panic("failed to parse mount options: " + err.Error())
}
if opts.msize != s.msize {
panic(fmt.Sprintf("new message size %v, want %v", opts.msize, s.msize))
}
if opts.version != s.version {
panic(fmt.Sprintf("new version %v, want %v", opts.version, s.version))
}
if opts.policy != s.cachePolicy {
panic(fmt.Sprintf("new cache policy %v, want %v", opts.policy, s.cachePolicy))
}
if opts.aname != s.aname {
panic(fmt.Sprintf("new attach name %v, want %v", opts.aname, s.aname))
}
// Check if endpointMaps exist when uds sockets are enabled
// (only pathmap will actualy have been saved).
if opts.privateunixsocket != (s.endpoints != nil) {
panic(fmt.Sprintf("new privateunixsocket option %v, want %v", opts.privateunixsocket, s.endpoints != nil))
}
if args.Flags != s.superBlockFlags {
panic(fmt.Sprintf("new mount flags %v, want %v", args.Flags, s.superBlockFlags))
}
// Manually restore the connection.
conn, err := unet.NewSocket(opts.fd)
if err != nil {
panic(fmt.Sprintf("failed to create Socket for FD %d: %v", opts.fd, err))
}
// Manually restore the client.
s.client, err = p9.NewClient(conn, s.msize, s.version)
if err != nil {
panic(fmt.Sprintf("failed to connect client to server: %v", err))
}
// Manually restore the attach point.
s.attach.file, err = s.client.Attach(s.aname)
if err != nil {
panic(fmt.Sprintf("failed to attach to aname: %v", err))
}
// If private unix sockets are enabled, create and fill the session's endpoint
// maps.
if opts.privateunixsocket {
// TODO(b/38173783): Context is not plumbed to save/restore.
ctx := &dummyClockContext{context.Background()}
if err = s.restoreEndpointMaps(ctx); err != nil {
panic("failed to restore endpoint maps: " + err.Error())
}
}
}
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