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Release 4.14 drivers/md/dm-uevent.c

Directory: drivers/md
/*
 * 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 <linux/dm-ioctl.h>
#include <linux/export.h>

#include "dm.h"
#include "dm-uevent.h"


#define DM_MSG_PREFIX "uevent"

static const struct {
	
enum dm_uevent_type type;
	
enum kobject_action action;
	
char *name;

} _dm_uevent_type_names[] = {
	{DM_UEVENT_PATH_FAILED, KOBJ_CHANGE, "PATH_FAILED"},
	{DM_UEVENT_PATH_REINSTATED, KOBJ_CHANGE, "PATH_REINSTATED"},
};


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;
	
char name[DM_NAME_LEN];
	
char uuid[DM_UUID_LEN];
};


static void dm_uevent_free(struct dm_uevent *event) { kmem_cache_free(_dm_event_cache, event); }

Contributors

PersonTokensPropCommitsCommitProp
Mike Anderson18100.00%1100.00%
Total18100.00%1100.00%


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; }

Contributors

PersonTokensPropCommitsCommitProp
Mike Anderson52100.00%1100.00%
Total52100.00%1100.00%


static struct dm_uevent *dm_build_path_uevent(struct mapped_device *md, struct dm_target *ti, enum kobject_action action, const char *dm_action, const char *path, unsigned nr_valid_paths) { struct dm_uevent *event; event = dm_uevent_alloc(md); if (!event) { DMERR("%s: dm_uevent_alloc() failed", __func__); goto err_nomem; } event->action = action; if (add_uevent_var(&event->ku_env, "DM_TARGET=%s", ti->type->name)) { DMERR("%s: add_uevent_var() for DM_TARGET failed", __func__); goto err_add; } if (add_uevent_var(&event->ku_env, "DM_ACTION=%s", dm_action)) { DMERR("%s: add_uevent_var() for DM_ACTION failed", __func__); goto err_add; } if (add_uevent_var(&event->ku_env, "DM_SEQNUM=%u", dm_next_uevent_seq(md))) { DMERR("%s: add_uevent_var() for DM_SEQNUM failed", __func__); goto err_add; } if (add_uevent_var(&event->ku_env, "DM_PATH=%s", path)) { DMERR("%s: add_uevent_var() for DM_PATH failed", __func__); goto err_add; } if (add_uevent_var(&event->ku_env, "DM_NR_VALID_PATHS=%d", nr_valid_paths)) { DMERR("%s: add_uevent_var() for DM_NR_VALID_PATHS failed", __func__); goto err_add; } return event; err_add: dm_uevent_free(event); err_nomem: return ERR_PTR(-ENOMEM); }

Contributors

PersonTokensPropCommitsCommitProp
Mike Anderson22097.35%150.00%
Harvey Harrison62.65%150.00%
Total226100.00%2100.00%

/** * dm_send_uevents - send uevents for given list * * @events: list of events to send * @kobj: kobject generating event * */
void dm_send_uevents(struct list_head *events, struct kobject *kobj) { int r; struct dm_uevent *event, *next; list_for_each_entry_safe(event, next, events, elist) { list_del_init(&event->elist); /* * When a device is being removed this copy fails and we * discard these unsent events. */ if (dm_copy_name_and_uuid(event->md, event->name, event->uuid)) { DMINFO("%s: skipping sending uevent for lost device", __func__); goto uevent_free; } if (add_uevent_var(&event->ku_env, "DM_NAME=%s", event->name)) { DMERR("%s: add_uevent_var() for DM_NAME failed", __func__); goto uevent_free; } if (add_uevent_var(&event->ku_env, "DM_UUID=%s", event->uuid)) { DMERR("%s: add_uevent_var() for DM_UUID failed", __func__); goto uevent_free; } r = kobject_uevent_env(kobj, event->action, event->ku_env.envp); if (r) DMERR("%s: kobject_uevent_env failed", __func__); uevent_free: dm_uevent_free(event); } }

Contributors

PersonTokensPropCommitsCommitProp
Mike Anderson16095.81%133.33%
Harvey Harrison42.40%133.33%
Mikulas Patocka31.80%133.33%
Total167100.00%3100.00%

EXPORT_SYMBOL_GPL(dm_send_uevents); /** * dm_path_uevent - called to create a new path event and queue it * * @event_type: path event type enum * @ti: pointer to a dm_target * @path: string containing pathname * @nr_valid_paths: number of valid paths remaining * */
void dm_path_uevent(enum dm_uevent_type event_type, struct dm_target *ti, const char *path, unsigned nr_valid_paths) { struct mapped_device *md = dm_table_get_md(ti->table); struct dm_uevent *event; if (event_type >= ARRAY_SIZE(_dm_uevent_type_names)) { DMERR("%s: Invalid event_type %d", __func__, event_type); return; } event = dm_build_path_uevent(md, ti, _dm_uevent_type_names[event_type].action, _dm_uevent_type_names[event_type].name, path, nr_valid_paths); if (IS_ERR(event)) return; dm_uevent_add(md, &event->elist); }

Contributors

PersonTokensPropCommitsCommitProp
Mike Anderson10297.14%133.33%
Kiyoshi Ueda21.90%133.33%
Harvey Harrison10.95%133.33%
Total105100.00%3100.00%

EXPORT_SYMBOL_GPL(dm_path_uevent);
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; }

Contributors

PersonTokensPropCommitsCommitProp
Mike Anderson33100.00%1100.00%
Total33100.00%1100.00%


void dm_uevent_exit(void) { kmem_cache_destroy(_dm_event_cache); }

Contributors

PersonTokensPropCommitsCommitProp
Mike Anderson12100.00%1100.00%
Total12100.00%1100.00%


Overall Contributors

PersonTokensPropCommitsCommitProp
Mike Anderson71097.39%233.33%
Harvey Harrison111.51%116.67%
Paul Gortmaker30.41%116.67%
Mikulas Patocka30.41%116.67%
Kiyoshi Ueda20.27%116.67%
Total729100.00%6100.00%
Directory: drivers/md
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