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/*
* Copyright (C) 2008 Red Hat, Inc., Eric Paris <eparis@redhat.com>
*
* 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, 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; see the file COPYING. If not, write to
* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <linux/fs.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/mount.h>
#include <linux/mutex.h>
#include <linux/namei.h>
#include <linux/path.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <asm/atomic.h>
#include <linux/fsnotify_backend.h>
#include "fsnotify.h"
static struct kmem_cache *fsnotify_event_cachep;
void fsnotify_get_event(struct fsnotify_event *event)
{
atomic_inc(&event->refcnt);
}
void fsnotify_put_event(struct fsnotify_event *event)
{
if (!event)
return;
if (atomic_dec_and_test(&event->refcnt)) {
if (event->data_type == FSNOTIFY_EVENT_PATH)
path_put(&event->path);
kmem_cache_free(fsnotify_event_cachep, event);
}
}
/*
* Allocate a new event which will be sent to each group's handle_event function
* if the group was interested in this particular event.
*/
struct fsnotify_event *fsnotify_create_event(struct inode *to_tell, __u32 mask,
void *data, int data_type)
{
struct fsnotify_event *event;
event = kmem_cache_alloc(fsnotify_event_cachep, GFP_KERNEL);
if (!event)
return NULL;
atomic_set(&event->refcnt, 1);
spin_lock_init(&event->lock);
event->path.dentry = NULL;
event->path.mnt = NULL;
event->inode = NULL;
event->to_tell = to_tell;
switch (data_type) {
case FSNOTIFY_EVENT_FILE: {
struct file *file = data;
struct path *path = &file->f_path;
event->path.dentry = path->dentry;
event->path.mnt = path->mnt;
path_get(&event->path);
event->data_type = FSNOTIFY_EVENT_PATH;
break;
}
case FSNOTIFY_EVENT_PATH: {
struct path *path = data;
event->path.dentry = path->dentry;
event->path.mnt = path->mnt;
path_get(&event->path);
event->data_type = FSNOTIFY_EVENT_PATH;
break;
}
case FSNOTIFY_EVENT_INODE:
event->inode = data;
event->data_type = FSNOTIFY_EVENT_INODE;
break;
case FSNOTIFY_EVENT_NONE:
event->inode = NULL;
event->path.dentry = NULL;
event->path.mnt = NULL;
break;
default:
BUG();
}
event->mask = mask;
return event;
}
__init int fsnotify_notification_init(void)
{
fsnotify_event_cachep = KMEM_CACHE(fsnotify_event, SLAB_PANIC);
return 0;
}
subsys_initcall(fsnotify_notification_init);
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