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freebsd
GitHub Repository: freebsd/freebsd-src
 Path: blob/main/sys/fs/devfs/devfs_int.h
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/*-

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 * SPDX-License-Identifier: BSD-2-Clause

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 *

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 * Copyright (c) 2005 Poul-Henning Kamp.  All rights reserved.

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 *

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 * Redistribution and use in source and binary forms, with or without

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 * modification, are permitted provided that the following conditions

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 * are met:

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 * 1. Redistributions of source code must retain the above copyright

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 *    notice, this list of conditions and the following disclaimer.

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 * 2. Neither the name of the University nor the names of its contributors

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 *    may be used to endorse or promote products derived from this software

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 *    without specific prior written permission.

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 *

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 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND

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 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

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 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

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 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE

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 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

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 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS

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 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

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 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

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 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY

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 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF

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 * SUCH DAMAGE.

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 */

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/*

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 * This file documents a private interface and it SHALL only be used

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 * by kern/kern_conf.c and fs/devfs/...

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 */

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#ifndef _FS_DEVFS_DEVFS_INT_H_

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#define	_FS_DEVFS_DEVFS_INT_H_

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#include <sys/queue.h>

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struct devfs_dirent;

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struct devfs_mount;

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struct cdev_privdata {

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	struct file		*cdpd_fp;

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	void			*cdpd_data;

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	void			(*cdpd_dtr)(void *);

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	LIST_ENTRY(cdev_privdata) cdpd_list;

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};

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struct cdev_priv {

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	struct cdev		cdp_c;

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	TAILQ_ENTRY(cdev_priv)	cdp_list;

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	u_int			cdp_inode;

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	u_int			cdp_flags;

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#define CDP_ACTIVE		(1 << 0)

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#define CDP_SCHED_DTR		(1 << 1)

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#define	CDP_UNREF_DTR		(1 << 2)

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#define CDP_ON_ACTIVE_LIST	(1 << 3)

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	u_int			cdp_inuse;

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	u_int			cdp_maxdirent;

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	struct devfs_dirent	**cdp_dirents;

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	struct devfs_dirent	*cdp_dirent0;

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	TAILQ_ENTRY(cdev_priv)	cdp_dtr_list;

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	void			(*cdp_dtr_cb)(void *);

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	void			*cdp_dtr_cb_arg;

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	LIST_HEAD(, cdev_privdata) cdp_fdpriv;

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	struct mtx		cdp_threadlock;

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};

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#define	cdev2priv(c)	__containerof(c, struct cdev_priv, cdp_c)

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#ifdef _KERNEL

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struct cdev	*devfs_alloc(int);

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int	devfs_dev_exists(const char *);

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void	devfs_free(struct cdev *);

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void	devfs_create(struct cdev *);

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void	devfs_destroy(struct cdev *);

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void	devfs_destroy_cdevpriv(struct cdev_privdata *);

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int	devfs_dir_find(const char *);

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void	devfs_dir_ref_de(struct devfs_mount *, struct devfs_dirent *);

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void	devfs_dir_unref_de(struct devfs_mount *, struct devfs_dirent *);

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int	devfs_pathpath(const char *, const char *);

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extern struct unrhdr *devfs_inos;

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extern struct mtx devmtx;

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extern struct mtx devfs_de_interlock;

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extern struct mtx cdevpriv_mtx;

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extern TAILQ_HEAD(cdev_priv_list, cdev_priv) cdevp_list;

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#define	dev_lock_assert_locked()	mtx_assert(&devmtx, MA_OWNED)

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#define	dev_lock_assert_unlocked()	mtx_assert(&devmtx, MA_NOTOWNED)

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#endif /* _KERNEL */

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#endif /* !_FS_DEVFS_DEVFS_INT_H_ */

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