122 lines
2.9 KiB
C
122 lines
2.9 KiB
C
/*
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* Copyright (C) 2008 Red Hat, Inc., Eric Paris <eparis@redhat.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU 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
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* along with this program; see the file COPYING. If not, write to
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* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/fs.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/list.h>
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#include <linux/mount.h>
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#include <linux/mutex.h>
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#include <linux/namei.h>
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#include <linux/path.h>
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#include <linux/slab.h>
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#include <linux/spinlock.h>
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#include <asm/atomic.h>
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#include <linux/fsnotify_backend.h>
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#include "fsnotify.h"
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static struct kmem_cache *fsnotify_event_cachep;
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void fsnotify_get_event(struct fsnotify_event *event)
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{
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atomic_inc(&event->refcnt);
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}
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void fsnotify_put_event(struct fsnotify_event *event)
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{
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if (!event)
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return;
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if (atomic_dec_and_test(&event->refcnt)) {
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if (event->data_type == FSNOTIFY_EVENT_PATH)
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path_put(&event->path);
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kmem_cache_free(fsnotify_event_cachep, event);
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}
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}
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/*
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* Allocate a new event which will be sent to each group's handle_event function
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* if the group was interested in this particular event.
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*/
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struct fsnotify_event *fsnotify_create_event(struct inode *to_tell, __u32 mask,
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void *data, int data_type)
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{
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struct fsnotify_event *event;
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event = kmem_cache_alloc(fsnotify_event_cachep, GFP_KERNEL);
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if (!event)
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return NULL;
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atomic_set(&event->refcnt, 1);
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spin_lock_init(&event->lock);
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event->path.dentry = NULL;
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event->path.mnt = NULL;
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event->inode = NULL;
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event->to_tell = to_tell;
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switch (data_type) {
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case FSNOTIFY_EVENT_FILE: {
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struct file *file = data;
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struct path *path = &file->f_path;
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event->path.dentry = path->dentry;
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event->path.mnt = path->mnt;
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path_get(&event->path);
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event->data_type = FSNOTIFY_EVENT_PATH;
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break;
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}
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case FSNOTIFY_EVENT_PATH: {
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struct path *path = data;
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event->path.dentry = path->dentry;
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event->path.mnt = path->mnt;
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path_get(&event->path);
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event->data_type = FSNOTIFY_EVENT_PATH;
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break;
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}
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case FSNOTIFY_EVENT_INODE:
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event->inode = data;
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event->data_type = FSNOTIFY_EVENT_INODE;
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break;
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case FSNOTIFY_EVENT_NONE:
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event->inode = NULL;
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event->path.dentry = NULL;
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event->path.mnt = NULL;
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break;
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default:
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BUG();
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}
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event->mask = mask;
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return event;
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}
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__init int fsnotify_notification_init(void)
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{
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fsnotify_event_cachep = KMEM_CACHE(fsnotify_event, SLAB_PANIC);
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return 0;
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}
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subsys_initcall(fsnotify_notification_init);
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