drivers/md/dm-exception-store.c

   1 /*
   2  * Copyright (C) 2001-2002 Sistina Software (UK) Limited.
   3  * Copyright (C) 2006-2008 Red Hat GmbH
   4  *
   5  * This file is released under the GPL.
   6  */
   7
   8 #include "dm-exception-store.h"
   9
  10 #include <linux/mm.h>
  11 #include <linux/pagemap.h>
  12 #include <linux/vmalloc.h>
  13 #include <linux/slab.h>
  14
  15 #define DM_MSG_PREFIX "snapshot exception stores"
  16
  17 int dm_exception_store_init(void)
  18 {
  19         int r;
  20
  21         r = dm_transient_snapshot_init();
  22         if (r) {
  23                 DMERR("Unable to register transient exception store type.");
  24                 goto transient_fail;
  25         }
  26
  27         r = dm_persistent_snapshot_init();
  28         if (r) {
  29                 DMERR("Unable to register persistent exception store type");
  30                 goto persistent_fail;
  31         }
  32
  33         return 0;
  34
  35 persistent_fail:
  36         dm_persistent_snapshot_exit();
  37 transient_fail:
  38         return r;
  39 }
  40
  41 void dm_exception_store_exit(void)
  42 {
  43         dm_persistent_snapshot_exit();
  44         dm_transient_snapshot_exit();
  45 }