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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 (
"golang.org/x/sys/unix"
"gvisor.dev/gvisor/pkg/abi/linux"
"gvisor.dev/gvisor/pkg/sentry/vfs"
)
func dentryTimestamp(t linux.StatxTimestamp) int64 {
return t.ToNsec()
}
func dentryTimestampFromUnix(t unix.Timespec) int64 {
return dentryTimestamp(linux.StatxTimestamp{Sec: t.Sec, Nsec: uint32(t.Nsec)})
}
// Preconditions: d.cachedMetadataAuthoritative() == true.
func (d *dentry) touchAtime(mnt *vfs.Mount) {
if opts := mnt.Options(); opts.Flags.NoATime || opts.ReadOnly {
return
}
if err := mnt.CheckBeginWrite(); err != nil {
return
}
now := d.fs.clock.Now().Nanoseconds()
d.metadataMu.Lock()
d.atime.Store(now)
d.atimeDirty.Store(1)
d.metadataMu.Unlock()
mnt.EndWrite()
}
// Preconditions: d.metadataMu is locked. d.cachedMetadataAuthoritative() == true.
func (d *dentry) touchAtimeLocked(mnt *vfs.Mount) {
if opts := mnt.Options(); opts.Flags.NoATime || opts.ReadOnly {
return
}
if err := mnt.CheckBeginWrite(); err != nil {
return
}
now := d.fs.clock.Now().Nanoseconds()
d.atime.Store(now)
d.atimeDirty.Store(1)
mnt.EndWrite()
}
// Preconditions:
// - d.cachedMetadataAuthoritative() == true.
// - The caller has successfully called vfs.Mount.CheckBeginWrite().
func (d *dentry) touchCtime() {
now := d.fs.clock.Now().Nanoseconds()
d.metadataMu.Lock()
d.ctime.Store(now)
d.metadataMu.Unlock()
}
// Preconditions:
// - d.cachedMetadataAuthoritative() == true.
// - The caller has successfully called vfs.Mount.CheckBeginWrite().
func (d *dentry) touchCMtime() {
now := d.fs.clock.Now().Nanoseconds()
d.metadataMu.Lock()
d.mtime.Store(now)
d.ctime.Store(now)
d.mtimeDirty.Store(1)
d.metadataMu.Unlock()
}
// Preconditions:
// - d.cachedMetadataAuthoritative() == true.
// - The caller has locked d.metadataMu.
func (d *dentry) touchCMtimeLocked() {
now := d.fs.clock.Now().Nanoseconds()
d.mtime.Store(now)
d.ctime.Store(now)
d.mtimeDirty.Store(1)
}
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