drivers/md/dm-uevent.c

   1 /*
   2  * Device Mapper Uevent Support (dm-uevent)
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms of the GNU General Public License as published by the
   6  * Free Software Foundation; either version 2 of the License, or (at your
   7  * option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along
  15  * with this program; if not, write to the Free Software Foundation, Inc.,
  16  * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  17  *
  18  * Copyright IBM Corporation, 2007
  19  *      Author: Mike Anderson <andmike@linux.vnet.ibm.com>
  20  */
  21 #include <linux/list.h>
  22 #include <linux/slab.h>
  23 #include <linux/kobject.h>
  24
  25 #include "dm.h"
  26 #include "dm-uevent.h"
  27
  28 #define DM_MSG_PREFIX "uevent"
  29
  30 static struct kmem_cache *_dm_event_cache;
  31
  32 struct dm_uevent {
  33         struct mapped_device *md;
  34         enum kobject_action action;
  35         struct kobj_uevent_env ku_env;
  36         struct list_head elist;
  37 };
  38
  39 static void dm_uevent_free(struct dm_uevent *event)
  40 {
  41         kmem_cache_free(_dm_event_cache, event);
  42 }
  43
  44 static struct dm_uevent *dm_uevent_alloc(struct mapped_device *md)
  45 {
  46         struct dm_uevent *event;
  47
  48         event = kmem_cache_zalloc(_dm_event_cache, GFP_ATOMIC);
  49         if (!event)
  50                 return NULL;
  51
  52         INIT_LIST_HEAD(&event->elist);
  53         event->md = md;
  54
  55         return event;
  56 }
  57
  58 int dm_uevent_init(void)
  59 {
  60         _dm_event_cache = KMEM_CACHE(dm_uevent, 0);
  61         if (!_dm_event_cache)
  62                 return -ENOMEM;
  63
  64         DMINFO("version 1.0.3");
  65
  66         return 0;
  67 }
  68
  69 void dm_uevent_exit(void)
  70 {
  71         kmem_cache_destroy(_dm_event_cache);
  72 }