The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/fs/devfs/devfs.h

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    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_ */

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