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_int.h

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2005 Poul-Henning Kamp.  All rights reserved.
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions
    8  * are met:
    9  * 1. Redistributions of source code must retain the above copyright
   10  *    notice, this list of conditions and the following disclaimer.
   11  * 2. Neither the name of the University nor the names of its contributors
   12  *    may be used to endorse or promote products derived from this software
   13  *    without specific prior written permission.
   14  *
   15  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   18  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   25  * SUCH DAMAGE.
   26  *
   27  * $FreeBSD$
   28  */
   29 
   30 /*
   31  * This file documents a private interface and it SHALL only be used
   32  * by kern/kern_conf.c and fs/devfs/...
   33  */
   34 
   35 #ifndef _FS_DEVFS_DEVFS_INT_H_
   36 #define _FS_DEVFS_DEVFS_INT_H_
   37 
   38 #include <sys/queue.h>
   39 
   40 struct devfs_dirent;
   41 struct devfs_mount;
   42 
   43 struct cdev_privdata {
   44         struct file             *cdpd_fp;
   45         void                    *cdpd_data;
   46         void                    (*cdpd_dtr)(void *);
   47         LIST_ENTRY(cdev_privdata) cdpd_list;
   48 };
   49 
   50 struct cdev_priv {
   51         struct cdev             cdp_c;
   52         TAILQ_ENTRY(cdev_priv)  cdp_list;
   53 
   54         u_int                   cdp_inode;
   55 
   56         u_int                   cdp_flags;
   57 #define CDP_ACTIVE              (1 << 0)
   58 #define CDP_SCHED_DTR           (1 << 1)
   59 #define CDP_UNREF_DTR           (1 << 2)
   60 
   61         u_int                   cdp_inuse;
   62         u_int                   cdp_maxdirent;
   63         struct devfs_dirent     **cdp_dirents;
   64         struct devfs_dirent     *cdp_dirent0;
   65 
   66         TAILQ_ENTRY(cdev_priv)  cdp_dtr_list;
   67         void                    (*cdp_dtr_cb)(void *);
   68         void                    *cdp_dtr_cb_arg;
   69 
   70         LIST_HEAD(, cdev_privdata) cdp_fdpriv;
   71 
   72         struct mtx              cdp_threadlock;
   73 };
   74 
   75 #define cdev2priv(c)    __containerof(c, struct cdev_priv, cdp_c)
   76 
   77 #ifdef _KERNEL
   78 
   79 struct cdev     *devfs_alloc(int);
   80 int     devfs_dev_exists(const char *);
   81 void    devfs_free(struct cdev *);
   82 void    devfs_create(struct cdev *);
   83 void    devfs_destroy(struct cdev *);
   84 void    devfs_destroy_cdevpriv(struct cdev_privdata *);
   85 
   86 int     devfs_dir_find(const char *);
   87 void    devfs_dir_ref_de(struct devfs_mount *, struct devfs_dirent *);
   88 void    devfs_dir_unref_de(struct devfs_mount *, struct devfs_dirent *);
   89 int     devfs_pathpath(const char *, const char *);
   90 
   91 extern struct unrhdr *devfs_inos;
   92 extern struct mtx devmtx;
   93 extern struct mtx devfs_de_interlock;
   94 extern struct mtx cdevpriv_mtx;
   95 extern TAILQ_HEAD(cdev_priv_list, cdev_priv) cdevp_list;
   96 
   97 #define dev_lock_assert_locked()        mtx_assert(&devmtx, MA_OWNED)
   98 #define dev_lock_assert_unlocked()      mtx_assert(&devmtx, MA_NOTOWNED)
   99 
  100 #endif /* _KERNEL */
  101 
  102 #endif /* !_FS_DEVFS_DEVFS_INT_H_ */

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