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/autofs/autofs.h

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2014 The FreeBSD Foundation
    5  * All rights reserved.
    6  *
    7  * This software was developed by Edward Tomasz Napierala under sponsorship
    8  * from the FreeBSD Foundation.
    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. Redistributions in binary form must reproduce the above copyright
   16  *    notice, this list of conditions and the following disclaimer in the
   17  *    documentation and/or other materials provided with the distribution.
   18  *
   19  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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  * $FreeBSD$
   32  */
   33 
   34 #ifndef AUTOFS_H
   35 #define AUTOFS_H
   36 
   37 #define VFSTOAUTOFS(mp)    ((struct autofs_mount *)((mp)->mnt_data))
   38 
   39 MALLOC_DECLARE(M_AUTOFS);
   40 
   41 extern uma_zone_t autofs_request_zone;
   42 extern uma_zone_t autofs_node_zone;
   43 
   44 extern int autofs_debug;
   45 extern int autofs_mount_on_stat;
   46 
   47 #define AUTOFS_DEBUG(X, ...)                                            \
   48         do {                                                            \
   49                 if (autofs_debug > 1)                                   \
   50                         printf("%s: " X "\n", __func__, ## __VA_ARGS__);\
   51         } while (0)
   52 
   53 #define AUTOFS_WARN(X, ...)                                             \
   54         do {                                                            \
   55                 if (autofs_debug > 0) {                                 \
   56                         printf("WARNING: %s: " X "\n",                  \
   57                             __func__, ## __VA_ARGS__);                  \
   58                 }                                                       \
   59         } while (0)
   60 
   61 #define AUTOFS_SLOCK(X)         sx_slock(&X->am_lock)
   62 #define AUTOFS_XLOCK(X)         sx_xlock(&X->am_lock)
   63 #define AUTOFS_SUNLOCK(X)       sx_sunlock(&X->am_lock)
   64 #define AUTOFS_XUNLOCK(X)       sx_xunlock(&X->am_lock)
   65 #define AUTOFS_ASSERT_LOCKED(X)         sx_assert(&X->am_lock, SA_LOCKED)
   66 #define AUTOFS_ASSERT_XLOCKED(X)        sx_assert(&X->am_lock, SA_XLOCKED)
   67 #define AUTOFS_ASSERT_UNLOCKED(X)       sx_assert(&X->am_lock, SA_UNLOCKED)
   68 
   69 struct autofs_node {
   70         RB_ENTRY(autofs_node)           an_link;
   71         char                            *an_name;
   72         int                             an_fileno;
   73         struct autofs_node              *an_parent;
   74         RB_HEAD(autofs_node_tree,
   75             autofs_node)                an_children;
   76         struct autofs_mount             *an_mount;
   77         struct vnode                    *an_vnode;
   78         struct sx                       an_vnode_lock;
   79         bool                            an_cached;
   80         bool                            an_wildcards;
   81         struct callout                  an_callout;
   82         int                             an_retries;
   83         struct timespec                 an_ctime;
   84 };
   85 
   86 struct autofs_mount {
   87         TAILQ_ENTRY(autofs_mount)       am_next;
   88         struct autofs_node              *am_root;
   89         struct mount                    *am_mp;
   90         struct sx                       am_lock;
   91         char                            am_from[MAXPATHLEN];
   92         char                            am_mountpoint[MAXPATHLEN];
   93         char                            am_options[MAXPATHLEN];
   94         char                            am_prefix[MAXPATHLEN];
   95         int                             am_last_fileno;
   96 };
   97 
   98 struct autofs_request {
   99         TAILQ_ENTRY(autofs_request)     ar_next;
  100         struct autofs_mount             *ar_mount;
  101         int                             ar_id;
  102         bool                            ar_done;
  103         int                             ar_error;
  104         bool                            ar_wildcards;
  105         bool                            ar_in_progress;
  106         char                            ar_from[MAXPATHLEN];
  107         char                            ar_path[MAXPATHLEN];
  108         char                            ar_prefix[MAXPATHLEN];
  109         char                            ar_key[MAXPATHLEN];
  110         char                            ar_options[MAXPATHLEN];
  111         struct timeout_task             ar_task;
  112         volatile u_int                  ar_refcount;
  113 };
  114 
  115 struct autofs_softc {
  116         device_t                        sc_dev;
  117         struct cdev                     *sc_cdev;
  118         struct cv                       sc_cv;
  119         struct sx                       sc_lock;
  120         TAILQ_HEAD(, autofs_request)    sc_requests;
  121         bool                            sc_dev_opened;
  122         pid_t                           sc_dev_sid;
  123         int                             sc_last_request_id;
  124 };
  125 
  126 int     autofs_init(struct vfsconf *vfsp);
  127 int     autofs_uninit(struct vfsconf *vfsp);
  128 int     autofs_trigger(struct autofs_node *anp, const char *component,
  129             int componentlen);
  130 bool    autofs_cached(struct autofs_node *anp, const char *component,
  131             int componentlen);
  132 void    autofs_flush(struct autofs_mount *amp);
  133 bool    autofs_ignore_thread(const struct thread *td);
  134 int     autofs_node_new(struct autofs_node *parent, struct autofs_mount *amp,
  135             const char *name, int namelen, struct autofs_node **anpp);
  136 int     autofs_node_find(struct autofs_node *parent,
  137             const char *name, int namelen, struct autofs_node **anpp);
  138 void    autofs_node_delete(struct autofs_node *anp);
  139 int     autofs_node_vn(struct autofs_node *anp, struct mount *mp,
  140             int flags, struct vnode **vpp);
  141 
  142 RB_PROTOTYPE(autofs_node_tree, autofs_node, an_link, autofs_node_cmp);
  143 
  144 #endif /* !AUTOFS_H */

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