mirror of
https://github.com/ceph/ceph-csi.git
synced 2024-11-10 08:20:23 +00:00
41 lines
1.1 KiB
Go
41 lines
1.1 KiB
Go
|
// Copyright 2023 The Go Authors. All rights reserved.
|
||
|
|
// Use of this source code is governed by a BSD-style
|
||
|
|
// license that can be found in the LICENSE file.
|
||
|
|
|
||
|
|
//go:build linux
|
||
|
|
// +build linux
|
||
|
|
|
||
|
|
package unix
|
||
|
|
|
||
|
|
import "unsafe"
|
||
|
|
|
||
|
|
type mremapMmapper struct {
|
||
|
|
mmapper
|
||
|
|
mremap func(oldaddr uintptr, oldlength uintptr, newlength uintptr, flags int, newaddr uintptr) (xaddr uintptr, err error)
|
||
|
|
}
|
||
|
|
|
||
|
|
func (m *mremapMmapper) Mremap(oldData []byte, newLength int, flags int) (data []byte, err error) {
|
||
|
|
if newLength <= 0 || len(oldData) == 0 || len(oldData) != cap(oldData) || flags&MREMAP_FIXED != 0 {
|
||
|
|
return nil, EINVAL
|
||
|
|
}
|
||
|
|
|
||
|
|
pOld := &oldData[cap(oldData)-1]
|
||
|
|
m.Lock()
|
||
|
|
defer m.Unlock()
|
||
|
|
bOld := m.active[pOld]
|
||
|
|
if bOld == nil || &bOld[0] != &oldData[0] {
|
||
|
|
return nil, EINVAL
|
||
|
|
}
|
||
|
|
newAddr, errno := m.mremap(uintptr(unsafe.Pointer(&bOld[0])), uintptr(len(bOld)), uintptr(newLength), flags, 0)
|
||
|
|
if errno != nil {
|
||
|
|
return nil, errno
|
||
|
|
}
|
||
|
|
bNew := unsafe.Slice((*byte)(unsafe.Pointer(newAddr)), newLength)
|
||
|
|
pNew := &bNew[cap(bNew)-1]
|
||
|
|
if flags&MREMAP_DONTUNMAP == 0 {
|
||
|
|
delete(m.active, pOld)
|
||
|
|
}
|
||
|
|
m.active[pNew] = bNew
|
||
|
|
return bNew, nil
|
||
|
|
}
|