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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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7a8c3d3b92
This patch adds support for the dm_path_event dm_send_event functions which create and send udev events. Signed-off-by: Mike Anderson <andmike@linux.vnet.ibm.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
223 lines
5.4 KiB
C
223 lines
5.4 KiB
C
/*
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* Device Mapper Uevent Support (dm-uevent)
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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* Copyright IBM Corporation, 2007
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* Author: Mike Anderson <andmike@linux.vnet.ibm.com>
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*/
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#include <linux/list.h>
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#include <linux/slab.h>
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#include <linux/kobject.h>
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#include <linux/dm-ioctl.h>
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#include "dm.h"
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#include "dm-uevent.h"
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#define DM_MSG_PREFIX "uevent"
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static const struct {
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enum dm_uevent_type type;
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enum kobject_action action;
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char *name;
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} _dm_uevent_type_names[] = {
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{DM_UEVENT_PATH_FAILED, KOBJ_CHANGE, "PATH_FAILED"},
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{DM_UEVENT_PATH_REINSTATED, KOBJ_CHANGE, "PATH_REINSTATED"},
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};
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static struct kmem_cache *_dm_event_cache;
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struct dm_uevent {
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struct mapped_device *md;
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enum kobject_action action;
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struct kobj_uevent_env ku_env;
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struct list_head elist;
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char name[DM_NAME_LEN];
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char uuid[DM_UUID_LEN];
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};
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static void dm_uevent_free(struct dm_uevent *event)
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{
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kmem_cache_free(_dm_event_cache, event);
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}
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static struct dm_uevent *dm_uevent_alloc(struct mapped_device *md)
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{
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struct dm_uevent *event;
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event = kmem_cache_zalloc(_dm_event_cache, GFP_ATOMIC);
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if (!event)
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return NULL;
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INIT_LIST_HEAD(&event->elist);
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event->md = md;
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return event;
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}
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static struct dm_uevent *dm_build_path_uevent(struct mapped_device *md,
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struct dm_target *ti,
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enum kobject_action action,
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const char *dm_action,
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const char *path,
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unsigned nr_valid_paths)
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{
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struct dm_uevent *event;
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event = dm_uevent_alloc(md);
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if (!event) {
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DMERR("%s: dm_uevent_alloc() failed", __FUNCTION__);
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goto err_nomem;
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}
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event->action = action;
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if (add_uevent_var(&event->ku_env, "DM_TARGET=%s", ti->type->name)) {
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DMERR("%s: add_uevent_var() for DM_TARGET failed",
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__FUNCTION__);
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goto err_add;
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}
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if (add_uevent_var(&event->ku_env, "DM_ACTION=%s", dm_action)) {
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DMERR("%s: add_uevent_var() for DM_ACTION failed",
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__FUNCTION__);
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goto err_add;
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}
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if (add_uevent_var(&event->ku_env, "DM_SEQNUM=%u",
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dm_next_uevent_seq(md))) {
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DMERR("%s: add_uevent_var() for DM_SEQNUM failed",
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__FUNCTION__);
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goto err_add;
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}
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if (add_uevent_var(&event->ku_env, "DM_PATH=%s", path)) {
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DMERR("%s: add_uevent_var() for DM_PATH failed", __FUNCTION__);
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goto err_add;
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}
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if (add_uevent_var(&event->ku_env, "DM_NR_VALID_PATHS=%d",
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nr_valid_paths)) {
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DMERR("%s: add_uevent_var() for DM_NR_VALID_PATHS failed",
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__FUNCTION__);
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goto err_add;
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}
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return event;
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err_add:
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dm_uevent_free(event);
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err_nomem:
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return ERR_PTR(-ENOMEM);
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}
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/**
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* dm_send_uevents - send uevents for given list
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*
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* @events: list of events to send
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* @kobj: kobject generating event
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*
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*/
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void dm_send_uevents(struct list_head *events, struct kobject *kobj)
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{
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int r;
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struct dm_uevent *event, *next;
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list_for_each_entry_safe(event, next, events, elist) {
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list_del_init(&event->elist);
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/*
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* Need to call dm_copy_name_and_uuid from here for now.
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* Context of previous var adds and locking used for
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* hash_cell not compatable.
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*/
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if (dm_copy_name_and_uuid(event->md, event->name,
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event->uuid)) {
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DMERR("%s: dm_copy_name_and_uuid() failed",
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__FUNCTION__);
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goto uevent_free;
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}
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if (add_uevent_var(&event->ku_env, "DM_NAME=%s", event->name)) {
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DMERR("%s: add_uevent_var() for DM_NAME failed",
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__FUNCTION__);
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goto uevent_free;
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}
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if (add_uevent_var(&event->ku_env, "DM_UUID=%s", event->uuid)) {
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DMERR("%s: add_uevent_var() for DM_UUID failed",
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__FUNCTION__);
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goto uevent_free;
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}
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r = kobject_uevent_env(kobj, event->action, event->ku_env.envp);
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if (r)
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DMERR("%s: kobject_uevent_env failed", __FUNCTION__);
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uevent_free:
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dm_uevent_free(event);
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}
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}
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EXPORT_SYMBOL_GPL(dm_send_uevents);
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/**
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* dm_path_uevent - called to create a new path event and queue it
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*
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* @event_type: path event type enum
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* @ti: pointer to a dm_target
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* @path: string containing pathname
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* @nr_valid_paths: number of valid paths remaining
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*
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*/
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void dm_path_uevent(enum dm_uevent_type event_type, struct dm_target *ti,
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const char *path, unsigned nr_valid_paths)
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{
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struct mapped_device *md = dm_table_get_md(ti->table);
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struct dm_uevent *event;
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if (event_type >= ARRAY_SIZE(_dm_uevent_type_names)) {
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DMERR("%s: Invalid event_type %d", __FUNCTION__, event_type);
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goto out;
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}
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event = dm_build_path_uevent(md, ti,
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_dm_uevent_type_names[event_type].action,
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_dm_uevent_type_names[event_type].name,
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path, nr_valid_paths);
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if (IS_ERR(event))
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goto out;
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dm_uevent_add(md, &event->elist);
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out:
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dm_put(md);
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}
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EXPORT_SYMBOL_GPL(dm_path_uevent);
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int dm_uevent_init(void)
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{
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_dm_event_cache = KMEM_CACHE(dm_uevent, 0);
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if (!_dm_event_cache)
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return -ENOMEM;
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DMINFO("version 1.0.3");
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return 0;
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}
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void dm_uevent_exit(void)
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{
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kmem_cache_destroy(_dm_event_cache);
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}
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