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// Copyright 2019 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 (
"sync/atomic"
"gvisor.dev/gvisor/pkg/abi/linux"
"gvisor.dev/gvisor/pkg/context"
ktime "gvisor.dev/gvisor/pkg/sentry/kernel/time"
"gvisor.dev/gvisor/pkg/sentry/vfs"
)
func dentryTimestampFromP9(s, ns uint64) int64 {
return int64(s*1e9 + ns)
}
func dentryTimestampFromStatx(ts linux.StatxTimestamp) int64 {
return ts.Sec*1e9 + int64(ts.Nsec)
}
func statxTimestampFromDentry(ns int64) linux.StatxTimestamp {
return linux.StatxTimestamp{
Sec: ns / 1e9,
Nsec: uint32(ns % 1e9),
}
}
func nowFromContext(ctx context.Context) (int64, bool) {
if clock := ktime.RealtimeClockFromContext(ctx); clock != nil {
return clock.Now().Nanoseconds(), true
}
return 0, false
}
// Preconditions: fs.interop != InteropModeShared.
func (d *dentry) touchAtime(ctx context.Context, mnt *vfs.Mount) {
if err := mnt.CheckBeginWrite(); err != nil {
return
}
now, ok := nowFromContext(ctx)
if !ok {
mnt.EndWrite()
return
}
d.metadataMu.Lock()
atomic.StoreInt64(&d.atime, now)
d.metadataMu.Unlock()
mnt.EndWrite()
}
// Preconditions: fs.interop != InteropModeShared. The caller has successfully
// called vfs.Mount.CheckBeginWrite().
func (d *dentry) touchCMtime(ctx context.Context) {
now, ok := nowFromContext(ctx)
if !ok {
return
}
d.metadataMu.Lock()
atomic.StoreInt64(&d.mtime, now)
atomic.StoreInt64(&d.ctime, now)
d.metadataMu.Unlock()
}
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