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      1 /*
      2  * Copyright (C) 2008 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 #ifndef _DEVMAPPER_H
     18 #define _DEVMAPPER_H
     19 
     20 #include <unistd.h>
     21 #include <linux/dm-ioctl.h>
     22 
     23 class SocketClient;
     24 
     25 class Devmapper {
     26 public:
     27     static int create(const char *name, const char *loopFile, const char *key,
     28                       unsigned long numSectors, char *buffer, size_t len);
     29     static int destroy(const char *name);
     30     static int lookupActive(const char *name, char *buffer, size_t len);
     31     static int dumpState(SocketClient *c);
     32 
     33 private:
     34     static void *_align(void *ptr, unsigned int a);
     35     static void ioctlInit(struct dm_ioctl *io, size_t data_size,
     36                           const char *name, unsigned flags);
     37 };
     38 
     39 #endif
     40