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