1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 1992, 1993 5 * The Regents of the University of California. All rights reserved. 6 * Copyright (c) 2000 7 * Poul-Henning Kamp. All rights reserved. 8 * Copyright (c) 2002 9 * Dima Dorfman. All rights reserved. 10 * 11 * This code is derived from software donated to Berkeley by 12 * Jan-Simon Pendry. 13 * 14 * Redistribution and use in source and binary forms, with or without 15 * modification, are permitted provided that the following conditions 16 * are met: 17 * 1. Redistributions of source code must retain the above copyright 18 * notice, this list of conditions and the following disclaimer. 19 * 2. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 * @(#)kernfs.h 8.6 (Berkeley) 3/29/95 36 * From: FreeBSD: src/sys/miscfs/kernfs/kernfs.h 1.14 37 * 38 * $FreeBSD$ 39 */ 40 41 #ifndef _FS_DEVFS_DEVFS_H_ 42 #define _FS_DEVFS_DEVFS_H_ 43 44 #define DEVFS_MAGIC 0xdb0a087a 45 46 /* 47 * Identifiers. The ruleset and rule numbers are 16-bit values. The 48 * "rule ID" is a combination of the ruleset and rule number; it 49 * should be able to univocally describe a rule in the system. In 50 * this implementation, the upper 16 bits of the rule ID is the 51 * ruleset number; the lower 16 bits, the rule number within the 52 * aforementioned ruleset. 53 */ 54 typedef uint16_t devfs_rnum; 55 typedef uint16_t devfs_rsnum; 56 typedef uint32_t devfs_rid; 57 58 /* 59 * Identifier manipulators. 60 */ 61 #define rid2rsn(rid) ((rid) >> 16) 62 #define rid2rn(rid) ((rid) & 0xffff) 63 #define mkrid(rsn, rn) ((rn) | ((rsn) << 16)) 64 65 /* 66 * Plain DEVFS rule. This gets shared between kernel and userland 67 * verbatim, so it shouldn't contain any pointers or other kernel- or 68 * userland-specific values. 69 */ 70 struct devfs_rule { 71 uint32_t dr_magic; /* Magic number. */ 72 devfs_rid dr_id; /* Identifier. */ 73 74 /* 75 * Conditions under which this rule should be applied. These 76 * are ANDed together since OR can be simulated by using 77 * multiple rules. dr_icond determines which of the other 78 * variables we should process. 79 */ 80 int dr_icond; 81 #define DRC_DSWFLAGS 0x001 82 #define DRC_PATHPTRN 0x002 83 int dr_dswflags; /* cdevsw flags to match. */ 84 #define DEVFS_MAXPTRNLEN 200 85 char dr_pathptrn[DEVFS_MAXPTRNLEN]; /* Pattern to match path. */ 86 87 /* 88 * Things to change. dr_iacts determines which of the other 89 * variables we should process. 90 */ 91 int dr_iacts; 92 #define DRA_BACTS 0x001 93 #define DRA_UID 0x002 94 #define DRA_GID 0x004 95 #define DRA_MODE 0x008 96 #define DRA_INCSET 0x010 97 int dr_bacts; /* Boolean (on/off) action. */ 98 #define DRB_HIDE 0x001 /* Hide entry (DE_WHITEOUT). */ 99 #define DRB_UNHIDE 0x002 /* Unhide entry. */ 100 uid_t dr_uid; 101 gid_t dr_gid; 102 mode_t dr_mode; 103 devfs_rsnum dr_incset; /* Included ruleset. */ 104 }; 105 106 /* 107 * Rule-related ioctls. 108 */ 109 #define DEVFSIO_RADD _IOWR('D', 0, struct devfs_rule) 110 #define DEVFSIO_RDEL _IOW('D', 1, devfs_rid) 111 #define DEVFSIO_RAPPLY _IOW('D', 2, struct devfs_rule) 112 #define DEVFSIO_RAPPLYID _IOW('D', 3, devfs_rid) 113 #define DEVFSIO_RGETNEXT _IOWR('D', 4, struct devfs_rule) 114 115 #define DEVFSIO_SUSE _IOW('D', 10, devfs_rsnum) 116 #define DEVFSIO_SAPPLY _IOW('D', 11, devfs_rsnum) 117 #define DEVFSIO_SGETNEXT _IOWR('D', 12, devfs_rsnum) 118 119 /* XXX: DEVFSIO_RS_GET_INFO for refcount, active if any, etc. */ 120 121 #ifdef _KERNEL 122 123 #ifdef MALLOC_DECLARE 124 MALLOC_DECLARE(M_DEVFS); 125 #endif 126 127 struct componentname; 128 129 TAILQ_HEAD(devfs_dlist_head, devfs_dirent); 130 131 struct devfs_dirent { 132 struct cdev_priv *de_cdp; 133 int de_inode; 134 int de_flags; 135 #define DE_WHITEOUT 0x01 136 #define DE_DOT 0x02 137 #define DE_DOTDOT 0x04 138 #define DE_DOOMED 0x08 139 #define DE_COVERED 0x10 140 #define DE_USER 0x20 141 int de_holdcnt; 142 struct dirent *de_dirent; 143 TAILQ_ENTRY(devfs_dirent) de_list; 144 struct devfs_dlist_head de_dlist; 145 struct devfs_dirent *de_dir; 146 int de_links; 147 mode_t de_mode; 148 uid_t de_uid; 149 gid_t de_gid; 150 struct label *de_label; 151 struct timespec de_atime; 152 struct timespec de_mtime; 153 struct timespec de_ctime; 154 struct vnode *de_vnode; 155 char *de_symlink; 156 int de_usecount; 157 }; 158 159 struct devfs_mount { 160 u_int dm_idx; 161 struct mount *dm_mount; 162 struct devfs_dirent *dm_rootdir; 163 unsigned dm_generation; 164 int dm_holdcnt; 165 struct sx dm_lock; 166 devfs_rsnum dm_ruleset; 167 }; 168 169 #define DEVFS_ROOTINO 2 170 171 extern unsigned devfs_rule_depth; 172 173 #define VFSTODEVFS(mp) ((struct devfs_mount *)((mp)->mnt_data)) 174 175 #define DEVFS_DE_HOLD(de) ((de)->de_holdcnt++) 176 #define DEVFS_DE_DROP(de) (--(de)->de_holdcnt == 0) 177 178 #define DEVFS_DMP_HOLD(dmp) ((dmp)->dm_holdcnt++) 179 #define DEVFS_DMP_DROP(dmp) (--(dmp)->dm_holdcnt == 0) 180 181 #define DEVFS_DEL_VNLOCKED 0x01 182 #define DEVFS_DEL_NORECURSE 0x02 183 184 void devfs_rules_apply(struct devfs_mount *, struct devfs_dirent *); 185 void devfs_rules_cleanup(struct devfs_mount *); 186 int devfs_rules_ioctl(struct devfs_mount *, u_long, caddr_t, 187 struct thread *); 188 void devfs_ruleset_set(devfs_rsnum rsnum, struct devfs_mount *dm); 189 void devfs_ruleset_apply(struct devfs_mount *dm); 190 int devfs_allocv(struct devfs_dirent *, struct mount *, int, 191 struct vnode **); 192 char *devfs_fqpn(char *, struct devfs_mount *, struct devfs_dirent *, 193 struct componentname *); 194 void devfs_delete(struct devfs_mount *, struct devfs_dirent *, int); 195 void devfs_dirent_free(struct devfs_dirent *); 196 int devfs_populate_needed(struct devfs_mount *dm); 197 void devfs_populate(struct devfs_mount *); 198 void devfs_cleanup(struct devfs_mount *); 199 void devfs_unmount_final(struct devfs_mount *); 200 struct devfs_dirent *devfs_newdirent(char *, int); 201 struct devfs_dirent *devfs_parent_dirent(struct devfs_dirent *); 202 struct devfs_dirent *devfs_vmkdir(struct devfs_mount *, char *, int, 203 struct devfs_dirent *, u_int); 204 struct devfs_dirent *devfs_find(struct devfs_dirent *, const char *, int, 205 int); 206 207 void devfs_ctty_ref(struct vnode *); 208 void devfs_ctty_unref(struct vnode *); 209 int devfs_usecount(struct vnode *); 210 211 #endif /* _KERNEL */ 212 213 #endif /* !_FS_DEVFS_DEVFS_H_ */ 214