1 /* 2 * Copyright (c) 1992, 1993 3 * The Regents of the University of California. All rights reserved. 4 * Copyright (c) 2000 5 * Poul-Henning Kamp. All rights reserved. 6 * 7 * This code is derived from software donated to Berkeley by 8 * Jan-Simon Pendry. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * @(#)kernfs.h 8.6 (Berkeley) 3/29/95 32 * From: FreeBSD: src/sys/miscfs/kernfs/kernfs.h 1.14 33 * 34 * $FreeBSD$ 35 */ 36 37 #ifndef _FS_DEVFS_DEVFS_H_ 38 #define _FS_DEVFS_DEVFS_H_ 39 40 #ifdef _KERNEL /* No userland stuff in here... */ 41 42 /* 43 * These are default sizes for the DEVFS inode table and the overflow 44 * table. If the default table overflows we allocate the overflow 45 * table, the size of which can also be set with a sysctl. If the 46 * overflow table fills you're toast. 47 */ 48 #ifndef NDEVFSINO 49 #define NDEVFSINO 1024 50 #endif 51 52 #ifndef NDEVFSOVERFLOW 53 #define NDEVFSOVERFLOW 32768 54 #endif 55 56 /* 57 * This is the first "per mount" inode, these are used for directories 58 * and symlinks and the like. Must be larger than the number of "true" 59 * device nodes and symlinks. It is. 60 */ 61 #define DEVFSINOMOUNT 0x2000000 62 63 MALLOC_DECLARE(M_DEVFS); 64 65 struct devfs_dirent { 66 int de_inode; 67 int de_flags; 68 #define DE_WHITEOUT 0x1 69 #define DE_DOT 0x2 70 #define DE_DOTDOT 0x4 71 struct dirent *de_dirent; 72 TAILQ_ENTRY(devfs_dirent) de_list; 73 TAILQ_HEAD(, devfs_dirent) de_dlist; 74 struct devfs_dirent *de_dir; 75 int de_links; 76 mode_t de_mode; 77 uid_t de_uid; 78 gid_t de_gid; 79 struct timespec de_atime; 80 struct timespec de_mtime; 81 struct timespec de_ctime; 82 struct vnode *de_vnode; 83 char * de_symlink; 84 }; 85 86 struct devfs_mount { 87 struct vnode *dm_root; /* Root node */ 88 struct devfs_dirent *dm_rootdir; 89 struct devfs_dirent *dm_basedir; 90 unsigned dm_generation; 91 struct devfs_dirent *dm_dirent[NDEVFSINO]; 92 struct devfs_dirent **dm_overflow; 93 int dm_inode; 94 struct lock dm_lock; 95 }; 96 97 /* 98 * This is what we fill in dm_dirent[N] for a deleted entry. 99 */ 100 #define DE_DELETED ((struct devfs_dirent *)sizeof(struct devfs_dirent)) 101 102 #define VFSTODEVFS(mp) ((struct devfs_mount *)((mp)->mnt_data)) 103 104 extern vop_t **devfs_vnodeop_p; 105 extern vop_t **devfs_specop_p; 106 107 int devfs_allocv (struct devfs_dirent *de, struct mount *mp, struct vnode **vpp, struct proc *p); 108 dev_t *devfs_itod (int inode); 109 struct devfs_dirent **devfs_itode (struct devfs_mount *dm, int inode); 110 int devfs_populate (struct devfs_mount *dm); 111 struct devfs_dirent *devfs_newdirent (char *name, int namelen); 112 void devfs_purge (struct devfs_dirent *dd); 113 struct devfs_dirent *devfs_vmkdir (char *name, int namelen, struct devfs_dirent *dotdot); 114 115 #endif /* _KERNEL */ 116 #endif /* _FS_DEVFS_DEVFS_H_ */ 117