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Based on 1 normalized pattern(s): 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 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 1334 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Richard Fontana <rfontana@redhat.com> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070033.113240726@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
206 lines
4.7 KiB
C
206 lines
4.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Device Mapper Uevent Support (dm-uevent)
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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 <linux/export.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", __func__);
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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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__func__);
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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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__func__);
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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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__func__);
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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", __func__);
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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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__func__);
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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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* When a device is being removed this copy fails and we
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* discard these unsent events.
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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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DMINFO("%s: skipping sending uevent for lost device",
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__func__);
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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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__func__);
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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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__func__);
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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", __func__);
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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", __func__, event_type);
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return;
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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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return;
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dm_uevent_add(md, &event->elist);
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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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