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dm: add uevent to core

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This patch adds a uevent skeleton to device-mapper.

Signed-off-by: Mike Anderson <andmike@linux.vnet.ibm.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
This commit is contained in:
Mike Anderson 2007-10-19 22:48:00 +01:00 committed by Alasdair G Kergon
parent 96a1f7dba6
commit 51e5b2bd34
5 changed files with 133 additions and 0 deletions
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6
drivers/md/Kconfig
View file

@ -282,4 +282,10 @@ config DM_DELAY
If unsure, say N.
config DM_UEVENT
bool "DM uevents (EXPERIMENTAL)"
depends on BLK_DEV_DM && EXPERIMENTAL
---help---
Generate udev events for DM events.
endif # MD

4
drivers/md/Makefile
View file

@ -50,6 +50,10 @@ ifeq ($(CONFIG_ALTIVEC),y)
altivec_flags := -maltivec -mabi=altivec
endif
ifeq ($(CONFIG_DM_UEVENT),y)
dm-mod-objs += dm-uevent.o
endif
targets += raid6int1.c
$(obj)/raid6int1.c: UNROLL := 1
$(obj)/raid6int1.c: $(src)/raid6int.uc $(src)/unroll.pl FORCE

72
drivers/md/dm-uevent.c Normal file
View file

@ -0,0 +1,72 @@
/*
* Device Mapper Uevent Support (dm-uevent)
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* Copyright IBM Corporation, 2007
* Author: Mike Anderson <andmike@linux.vnet.ibm.com>
*/
#include <linux/list.h>
#include <linux/slab.h>
#include <linux/kobject.h>
#include "dm.h"
#include "dm-uevent.h"
#define DM_MSG_PREFIX "uevent"
static struct kmem_cache *_dm_event_cache;
struct dm_uevent {
struct mapped_device *md;
enum kobject_action action;
struct kobj_uevent_env ku_env;
struct list_head elist;
};
static void dm_uevent_free(struct dm_uevent *event)
{
kmem_cache_free(_dm_event_cache, event);
}
static struct dm_uevent *dm_uevent_alloc(struct mapped_device *md)
{
struct dm_uevent *event;
event = kmem_cache_zalloc(_dm_event_cache, GFP_ATOMIC);
if (!event)
return NULL;
INIT_LIST_HEAD(&event->elist);
event->md = md;
return event;
}
int dm_uevent_init(void)
{
_dm_event_cache = KMEM_CACHE(dm_uevent, 0);
if (!_dm_event_cache)
return -ENOMEM;
DMINFO("version 1.0.3");
return 0;
}
void dm_uevent_exit(void)
{
kmem_cache_destroy(_dm_event_cache);
}

41
drivers/md/dm-uevent.h Normal file
View file

@ -0,0 +1,41 @@
/*
* Device Mapper Uevent Support
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* Copyright IBM Corporation, 2007
* Author: Mike Anderson <andmike@linux.vnet.ibm.com>
*/
#ifndef DM_UEVENT_H
#define DM_UEVENT_H
#ifdef CONFIG_DM_UEVENT
extern int dm_uevent_init(void);
extern void dm_uevent_exit(void);
#else
static inline int dm_uevent_init(void)
{
return 0;
}
static inline void dm_uevent_exit(void)
{
}
#endif /* CONFIG_DM_UEVENT */
#endif /* DM_UEVENT_H */

10
drivers/md/dm.c
View file

@ -7,6 +7,7 @@
#include "dm.h"
#include "dm-bio-list.h"
#include "dm-uevent.h"
#include <linux/init.h>
#include <linux/module.h>
@ -143,11 +144,19 @@ static int __init local_init(void)
return -ENOMEM;
}
r = dm_uevent_init();
if (r) {
kmem_cache_destroy(_tio_cache);
kmem_cache_destroy(_io_cache);
return r;
}
_major = major;
r = register_blkdev(_major, _name);
if (r < 0) {
kmem_cache_destroy(_tio_cache);
kmem_cache_destroy(_io_cache);
dm_uevent_exit();
return r;
}
@ -162,6 +171,7 @@ static void local_exit(void)
kmem_cache_destroy(_tio_cache);
kmem_cache_destroy(_io_cache);
unregister_blkdev(_major, _name);
dm_uevent_exit();
_major = 0;