xref: /freebsd-10.2-release/sys/fs/devfs/devfs.h

/*
 * Copyright (c) 1992, 1993
 *	The Regents of the University of California.  All rights reserved.
 * Copyright (c) 2000
 *	Poul-Henning Kamp.  All rights reserved.
 *
 * This code is derived from software donated to Berkeley by
 * Jan-Simon Pendry.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	@(#)kernfs.h	8.6 (Berkeley) 3/29/95
 * From: FreeBSD: src/sys/miscfs/kernfs/kernfs.h 1.14
 *
 * $FreeBSD: head/sys/fs/devfs/devfs.h 83366 2001-09-12 08:38:13Z julian $
 */

#ifndef _FS_DEVFS_DEVFS_H_
#define _FS_DEVFS_DEVFS_H_

#ifdef _KERNEL	/* No userland stuff in here... */

/*
 * These are default sizes for the DEVFS inode table and the overflow
 * table.  If the default table overflows we allocate the overflow
 * table, the size of which can also be set with a sysctl.  If the
 * overflow table fills you're toast.
 */
#ifndef NDEVFSINO
#define NDEVFSINO 1024
#endif

#ifndef NDEVFSOVERFLOW
#define NDEVFSOVERFLOW 32768
#endif

/*
 * This is the first "per mount" inode, these are used for directories
 * and symlinks and the like.  Must be larger than the number of "true"
 * device nodes and symlinks.  It is.
 */
#define DEVFSINOMOUNT	0x2000000

MALLOC_DECLARE(M_DEVFS);

struct devfs_dirent {
	int	de_inode;
	int	de_flags;
#define	DE_WHITEOUT	0x1
#define	DE_DOT		0x2
#define	DE_DOTDOT	0x4
	struct dirent *de_dirent;
	TAILQ_ENTRY(devfs_dirent) de_list;
	TAILQ_HEAD(, devfs_dirent) de_dlist;
	struct devfs_dirent *de_dir;
	int	de_links;
	mode_t	de_mode;
	uid_t	de_uid;
	gid_t	de_gid;
	struct timespec de_atime;
	struct timespec de_mtime;
	struct timespec de_ctime;
	struct vnode *de_vnode;
	char *	de_symlink;
};

struct devfs_mount {
	struct vnode	*dm_root;	/* Root node */
	struct devfs_dirent *dm_rootdir;
	struct devfs_dirent *dm_basedir;
	unsigned	dm_generation;
	struct devfs_dirent *dm_dirent[NDEVFSINO];
	struct devfs_dirent **dm_overflow;
	int	dm_inode;
	struct lock dm_lock;
};

/*
 * This is what we fill in dm_dirent[N] for a deleted entry.
 */
#define DE_DELETED ((struct devfs_dirent *)sizeof(struct devfs_dirent))

#define VFSTODEVFS(mp)	((struct devfs_mount *)((mp)->mnt_data))

extern vop_t **devfs_vnodeop_p;
extern vop_t **devfs_specop_p;

int devfs_allocv (struct devfs_dirent *de, struct mount *mp, struct vnode **vpp, struct thread *td);
dev_t *devfs_itod (int inode);
struct devfs_dirent **devfs_itode (struct devfs_mount *dm, int inode);
int devfs_populate (struct devfs_mount *dm);
struct devfs_dirent *devfs_newdirent (char *name, int namelen);
void devfs_purge (struct devfs_dirent *dd);
struct devfs_dirent *devfs_vmkdir (char *name, int namelen, struct devfs_dirent *dotdot);

#endif /* _KERNEL */
#endif /* _FS_DEVFS_DEVFS_H_ */