1/*-
  2 * SPDX-License-Identifier: BSD-2-Clause
  3 *
  4 * Copyright (c) 2005 Poul-Henning Kamp.  All rights reserved.
  5 *
  6 * Redistribution and use in source and binary forms, with or without
  7 * modification, are permitted provided that the following conditions
  8 * are met:
  9 * 1. Redistributions of source code must retain the above copyright
 10 *    notice, this list of conditions and the following disclaimer.
 11 * 2. Neither the name of the University nor the names of its contributors
 12 *    may be used to endorse or promote products derived from this software
 13 *    without specific prior written permission.
 14 *
 15 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 18 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 25 * SUCH DAMAGE.
 26 */
 27
 28/*
 29 * This file documents a private interface and it SHALL only be used
 30 * by kern/kern_conf.c and fs/devfs/...
 31 */
 32
 33#ifndef _FS_DEVFS_DEVFS_INT_H_
 34#define	_FS_DEVFS_DEVFS_INT_H_
 35
 36#include <sys/queue.h>
 37
 38struct devfs_dirent;
 39struct devfs_mount;
 40
 41struct cdev_privdata {
 42	struct file		*cdpd_fp;
 43	void			*cdpd_data;
 44	void			(*cdpd_dtr)(void *);
 45	LIST_ENTRY(cdev_privdata) cdpd_list;
 46};
 47
 48struct cdev_priv {
 49	struct cdev		cdp_c;
 50	TAILQ_ENTRY(cdev_priv)	cdp_list;
 51
 52	u_int			cdp_inode;
 53
 54	u_int			cdp_flags;
 55#define CDP_ACTIVE		(1 << 0)
 56#define CDP_SCHED_DTR		(1 << 1)
 57#define	CDP_UNREF_DTR		(1 << 2)
 58#define CDP_ON_ACTIVE_LIST	(1 << 3)
 59
 60	u_int			cdp_inuse;
 61	u_int			cdp_maxdirent;
 62	struct devfs_dirent	**cdp_dirents;
 63	struct devfs_dirent	*cdp_dirent0;
 64
 65	TAILQ_ENTRY(cdev_priv)	cdp_dtr_list;
 66	void			(*cdp_dtr_cb)(void *);
 67	void			*cdp_dtr_cb_arg;
 68
 69	LIST_HEAD(, cdev_privdata) cdp_fdpriv;
 70
 71	struct mtx		cdp_threadlock;
 72};
 73
 74#define	cdev2priv(c)	__containerof(c, struct cdev_priv, cdp_c)
 75
 76#ifdef _KERNEL
 77
 78struct cdev	*devfs_alloc(int);
 79int	devfs_dev_exists(const char *);
 80void	devfs_free(struct cdev *);
 81void	devfs_create(struct cdev *);
 82void	devfs_destroy(struct cdev *);
 83void	devfs_destroy_cdevpriv(struct cdev_privdata *);
 84
 85int	devfs_dir_find(const char *);
 86void	devfs_dir_ref_de(struct devfs_mount *, struct devfs_dirent *);
 87void	devfs_dir_unref_de(struct devfs_mount *, struct devfs_dirent *);
 88int	devfs_pathpath(const char *, const char *);
 89
 90extern struct unrhdr *devfs_inos;
 91extern struct mtx devmtx;
 92extern struct mtx devfs_de_interlock;
 93extern struct mtx cdevpriv_mtx;
 94extern TAILQ_HEAD(cdev_priv_list, cdev_priv) cdevp_list;
 95
 96#define	dev_lock_assert_locked()	mtx_assert(&devmtx, MA_OWNED)
 97#define	dev_lock_assert_unlocked()	mtx_assert(&devmtx, MA_NOTOWNED)
 98
 99#endif /* _KERNEL */
100
101#endif /* !_FS_DEVFS_DEVFS_INT_H_ */