sys/vfs/autofs/autofs.h

   1 /*-
   2  * Copyright (c) 2016 The DragonFly Project
   3  * Copyright (c) 2014 The FreeBSD Foundation
   4  * All rights reserved.
   5  *
   6  * This software was developed by Edward Tomasz Napierala under sponsorship
   7  * from the FreeBSD Foundation.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in the
  16  *    documentation and/or other materials provided with the distribution.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  19  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  21  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  22  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  23  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  24  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  25  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  26  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  27  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  28  * SUCH DAMAGE.
  29  *
  30  * $FreeBSD$
  31  */
  32
  33 #ifndef AUTOFS_H
  34 #define AUTOFS_H
  35
  36 #include <sys/kernel.h>
  37 #include <sys/module.h>
  38 #include <sys/types.h>
  39 #include <sys/systm.h>
  40 #include <sys/malloc.h>
  41 #include <sys/objcache.h>
  42 #include <sys/tree.h>
  43 #include <sys/lock.h>
  44 #include <sys/mutex2.h>
  45 #include <sys/condvar.h>
  46 #include <sys/mount.h>
  47 #include <sys/vnode.h>
  48 #include <sys/timespec.h>
  49 #include <sys/callout.h>
  50 #include <sys/taskqueue.h>
  51 #include <sys/conf.h>
  52 #include <sys/bus.h>
  53
  54 #define AUTOFS_ROOTINO  ((ino_t)1)
  55 #define VFSTOAUTOFS(mp) ((struct autofs_mount *)((mp)->mnt_data))
  56 #define VTOI(vp)        ((struct autofs_node *)((vp)->v_data))
  57
  58 MALLOC_DECLARE(M_AUTOFS);
  59
  60 extern struct objcache *autofs_request_objcache;
  61 extern struct objcache *autofs_node_objcache;
  62
  63 extern struct vop_ops autofs_vnode_vops;
  64
  65 extern int autofs_debug;
  66 extern int autofs_mount_on_stat;
  67
  68 #define AUTOFS_DEBUG(X, ...)                            \
  69         do {                                            \
  70                 if (autofs_debug > 1)                   \
  71                         kprintf("%s: " X "\n",          \
  72                             __func__, ## __VA_ARGS__);  \
  73         } while (0)
  74
  75 #define AUTOFS_WARN(X, ...)                             \
  76         do {                                            \
  77                 if (autofs_debug > 0) {                 \
  78                         kprintf("WARNING: %s: " X "\n", \
  79                             __func__, ## __VA_ARGS__);  \
  80                 }                                       \
  81         } while (0)
  82
  83 #define AUTOFS_FATAL(X, ...)                            \
  84         kprintf("FATAL: %s: " X "\n", __func__, ## __VA_ARGS__)
  85
  86 /*
  87  * APRINTF is only for debugging.
  88  */
  89 #define APRINTF(X, ...)                                 \
  90         kprintf("### %s(%s): " X,                       \
  91             __func__, curproc->p_comm, ## __VA_ARGS__)
  92
  93 struct autofs_node {
  94         RB_ENTRY(autofs_node)           an_link;
  95         char                            *an_name;
  96         ino_t                           an_ino;
  97         struct autofs_node              *an_parent;
  98         RB_HEAD(autofs_node_tree,
  99             autofs_node)                an_children;
 100         struct autofs_mount             *an_mount;
 101         struct vnode                    *an_vnode;
 102         mtx_t                           an_vnode_lock;
 103         bool                            an_cached;
 104         bool                            an_wildcards;
 105         struct callout                  an_callout;
 106         int                             an_retries;
 107         struct timespec                 an_ctime;
 108 };
 109
 110 struct autofs_mount {
 111         TAILQ_ENTRY(autofs_mount)       am_next;
 112         struct autofs_node              *am_root;
 113         struct mount                    *am_mp;
 114         mtx_t                           am_lock;
 115         char                            am_from[MAXPATHLEN];
 116         char                            am_on[MAXPATHLEN];
 117         char                            am_options[MAXPATHLEN];
 118         char                            am_prefix[MAXPATHLEN];
 119         ino_t                           am_last_ino;
 120 };
 121
 122 struct autofs_request {
 123         TAILQ_ENTRY(autofs_request)     ar_next;
 124         struct autofs_mount             *ar_mount;
 125         int                             ar_id;
 126         bool                            ar_done;
 127         int                             ar_error;
 128         bool                            ar_wildcards;
 129         bool                            ar_in_progress;
 130         char                            ar_from[MAXPATHLEN];
 131         char                            ar_path[MAXPATHLEN];
 132         char                            ar_prefix[MAXPATHLEN];
 133         char                            ar_key[MAXPATHLEN];
 134         char                            ar_options[MAXPATHLEN];
 135         struct timeout_task             ar_task;
 136         volatile u_int                  ar_refcount;
 137 };
 138
 139 struct autofs_softc {
 140         device_t                        sc_dev;
 141         struct cdev                     *sc_cdev;
 142         struct cv                       sc_cv;
 143         struct lock                     sc_lock;
 144         TAILQ_HEAD(, autofs_request)    sc_requests;
 145         bool                            sc_dev_opened;
 146         pid_t                           sc_dev_sid;
 147         int                             sc_last_request_id;
 148 };
 149
 150 int     autofs_init(struct vfsconf *vfsp);
 151 int     autofs_uninit(struct vfsconf *vfsp);
 152 int     autofs_trigger(struct autofs_node *anp, const char *component,
 153             int componentlen);
 154 bool    autofs_cached(struct autofs_node *anp, const char *component,
 155             int componentlen);
 156 char*   autofs_path(struct autofs_node *anp);
 157 void    autofs_flush(struct autofs_mount *amp);
 158 bool    autofs_ignore_thread(void);
 159 int     autofs_node_new(struct autofs_node *parent, struct autofs_mount *amp,
 160             const char *name, int namelen, struct autofs_node **anpp);
 161 int     autofs_node_find(struct autofs_node *parent,
 162             const char *name, int namelen, struct autofs_node **anpp);
 163 void    autofs_node_delete(struct autofs_node *anp);
 164 int     autofs_node_vn(struct autofs_node *anp, struct mount *mp,
 165             int flags, struct vnode **vpp);
 166
 167 static __inline void
 168 autofs_node_cache(struct autofs_node *anp)
 169 {
 170         anp->an_cached = true;
 171 }
 172
 173 static __inline void
 174 autofs_node_uncache(struct autofs_node *anp)
 175 {
 176         anp->an_cached = false;
 177 }
 178
 179 RB_PROTOTYPE(autofs_node_tree, autofs_node, an_link, autofs_node_cmp);
 180
 181 #endif /* !AUTOFS_H */