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  * 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  * Copyright (c) 2002
    7  *      Dima Dorfman.  All rights reserved.
    8  *
    9  * This code is derived from software donated to Berkeley by
   10  * Jan-Simon Pendry.
   11  *
   12  * Redistribution and use in source and binary forms, with or without
   13  * modification, are permitted provided that the following conditions
   14  * are met:
   15  * 1. Redistributions of source code must retain the above copyright
   16  *    notice, this list of conditions and the following disclaimer.
   17  * 2. Neither the name of the University nor the names of its contributors
   18  *    may be used to endorse or promote products derived from this software
   19  *    without specific prior written permission.
   20  *
   21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   31  * SUCH DAMAGE.
   32  *
   33  *      @(#)kernfs.h    8.6 (Berkeley) 3/29/95
   34  * From: FreeBSD: src/sys/miscfs/kernfs/kernfs.h 1.14
   35  *
   36  * $FreeBSD$
   37  */
   38 
   39 #ifndef _FS_DEVFS_DEVFS_H_
   40 #define _FS_DEVFS_DEVFS_H_
   41 
   42 #define DEVFS_MAGIC     0xdb0a087a
   43 
   44 /*
   45  * Identifiers.  The ruleset and rule numbers are 16-bit values.  The
   46  * "rule ID" is a combination of the ruleset and rule number; it
   47  * should be able to univocally describe a rule in the system.  In
   48  * this implementation, the upper 16 bits of the rule ID is the
   49  * ruleset number; the lower 16 bits, the rule number within the
   50  * aforementioned ruleset.
   51  */
   52 typedef uint16_t devfs_rnum;
   53 typedef uint16_t devfs_rsnum;
   54 typedef uint32_t devfs_rid;
   55 
   56 /*
   57  * Identifier manipulators.
   58  */
   59 #define rid2rsn(rid)    ((rid) >> 16)
   60 #define rid2rn(rid)     ((rid) & 0xffff)
   61 #define mkrid(rsn, rn)  ((rn) | ((rsn) << 16))
   62 
   63 /*
   64  * Plain DEVFS rule.  This gets shared between kernel and userland
   65  * verbatim, so it shouldn't contain any pointers or other kernel- or
   66  * userland-specific values.
   67  */
   68 struct devfs_rule {
   69         uint32_t dr_magic;                      /* Magic number. */
   70         devfs_rid dr_id;                        /* Identifier. */
   71 
   72         /*
   73          * Conditions under which this rule should be applied.  These
   74          * are ANDed together since OR can be simulated by using
   75          * multiple rules.  dr_icond determines which of the other
   76          * variables we should process.
   77          */
   78         int     dr_icond;
   79 #define DRC_DSWFLAGS    0x001
   80 #define DRC_PATHPTRN    0x002
   81         int     dr_dswflags;                    /* cdevsw flags to match. */
   82 #define DEVFS_MAXPTRNLEN        200
   83         char    dr_pathptrn[DEVFS_MAXPTRNLEN];  /* Pattern to match path. */
   84 
   85         /*
   86          * Things to change.  dr_iacts determines which of the other
   87          * variables we should process.
   88          */
   89         int     dr_iacts;
   90 #define DRA_BACTS       0x001
   91 #define DRA_UID         0x002
   92 #define DRA_GID         0x004
   93 #define DRA_MODE        0x008
   94 #define DRA_INCSET      0x010
   95         int     dr_bacts;                       /* Boolean (on/off) action. */
   96 #define DRB_HIDE        0x001                   /* Hide entry (DE_WHITEOUT). */
   97 #define DRB_UNHIDE      0x002                   /* Unhide entry. */
   98         uid_t   dr_uid;
   99         gid_t   dr_gid;
  100         mode_t  dr_mode;
  101         devfs_rsnum dr_incset;                  /* Included ruleset. */
  102 };
  103 
  104 /*
  105  * Rule-related ioctls.
  106  */
  107 #define DEVFSIO_RADD            _IOWR('D', 0, struct devfs_rule)
  108 #define DEVFSIO_RDEL            _IOW('D', 1, devfs_rid)
  109 #define DEVFSIO_RAPPLY          _IOW('D', 2, struct devfs_rule)
  110 #define DEVFSIO_RAPPLYID        _IOW('D', 3, devfs_rid)
  111 #define DEVFSIO_RGETNEXT        _IOWR('D', 4, struct devfs_rule)
  112 
  113 #define DEVFSIO_SUSE            _IOW('D', 10, devfs_rsnum)
  114 #define DEVFSIO_SAPPLY          _IOW('D', 11, devfs_rsnum)
  115 #define DEVFSIO_SGETNEXT        _IOWR('D', 12, devfs_rsnum)
  116 
  117 /* XXX: DEVFSIO_RS_GET_INFO for refcount, active if any, etc. */
  118 
  119 #ifdef _KERNEL
  120 
  121 #ifdef MALLOC_DECLARE
  122 MALLOC_DECLARE(M_DEVFS);
  123 #endif
  124 
  125 struct devfs_dirent {
  126         struct cdev_priv        *de_cdp;
  127         int                     de_inode;
  128         int                     de_flags;
  129 #define DE_WHITEOUT     0x1
  130 #define DE_DOT          0x2
  131 #define DE_DOTDOT       0x4
  132 #define DE_DOOMED       0x8
  133         int                     de_holdcnt;
  134         struct dirent           *de_dirent;
  135         TAILQ_ENTRY(devfs_dirent) de_list;
  136         TAILQ_HEAD(, devfs_dirent) de_dlist;
  137         struct devfs_dirent     *de_dir;
  138         int                     de_links;
  139         mode_t                  de_mode;
  140         uid_t                   de_uid;
  141         gid_t                   de_gid;
  142         struct label            *de_label;
  143         struct timespec         de_atime;
  144         struct timespec         de_mtime;
  145         struct timespec         de_ctime;
  146         struct vnode            *de_vnode;
  147         char                    *de_symlink;
  148 };
  149 
  150 struct devfs_mount {
  151         u_int                   dm_idx;
  152         struct mount            *dm_mount;
  153         struct devfs_dirent     *dm_rootdir;
  154         unsigned                dm_generation;
  155         int                     dm_holdcnt;
  156         struct sx               dm_lock;
  157         devfs_rsnum             dm_ruleset;
  158 };
  159 
  160 #define DEVFS_ROOTINO 2
  161 
  162 extern unsigned devfs_rule_depth;
  163 
  164 #define VFSTODEVFS(mp)  ((struct devfs_mount *)((mp)->mnt_data))
  165 
  166 #define DEVFS_DE_HOLD(de)       ((de)->de_holdcnt++)
  167 #define DEVFS_DE_DROP(de)       (--(de)->de_holdcnt == 0)
  168 
  169 #define DEVFS_DMP_HOLD(dmp)     ((dmp)->dm_holdcnt++)
  170 #define DEVFS_DMP_DROP(dmp)     (--(dmp)->dm_holdcnt == 0)
  171 
  172 void devfs_rules_apply(struct devfs_mount *dm, struct devfs_dirent *de);
  173 void devfs_rules_cleanup (struct devfs_mount *dm);
  174 int devfs_rules_ioctl(struct devfs_mount *dm, u_long cmd, caddr_t data, struct thread *td);
  175 int devfs_allocv (struct devfs_dirent *de, struct mount *mp, struct vnode **vpp, struct thread *td);
  176 void devfs_delete(struct devfs_mount *dm, struct devfs_dirent *de, int vp_locked);
  177 void devfs_dirent_free(struct devfs_dirent *de);
  178 void devfs_populate (struct devfs_mount *dm);
  179 void devfs_cleanup (struct devfs_mount *dm);
  180 void devfs_unmount_final(struct devfs_mount *mp);
  181 struct devfs_dirent *devfs_newdirent (char *name, int namelen);
  182 struct devfs_dirent *devfs_vmkdir (struct devfs_mount *, char *name, int namelen, struct devfs_dirent *dotdot, u_int inode);
  183 struct devfs_dirent *devfs_find (struct devfs_dirent *dd, const char *name, int namelen);
  184 
  185 #endif /* _KERNEL */
  186 
  187 #endif /* !_FS_DEVFS_DEVFS_H_ */

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