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/condvar.h>
  45 #include <sys/mount.h>
  46 #include <sys/vnode.h>
  47 #include <sys/timespec.h>
  48 #include <sys/callout.h>
  49 #include <sys/taskqueue.h>
  50 #include <sys/conf.h>
  51 #include <sys/bus.h>
  52
  53 #define AUTOFS_ROOTINO  ((ino_t)1)
  54 #define VFSTOAUTOFS(mp) ((struct autofs_mount *)((mp)->mnt_data))
  55 #define VTOI(vp)        ((struct autofs_node *)((vp)->v_data))
  56
  57 MALLOC_DECLARE(M_AUTOFS);
  58
  59 extern struct objcache *autofs_request_objcache;
  60 extern struct objcache *autofs_node_objcache;
  61
  62 extern struct vop_ops autofs_vnode_vops;
  63
  64 extern int autofs_debug;
  65 extern int autofs_mount_on_stat;
  66
  67 #define AUTOFS_DEBUG(X, ...)                            \
  68         do {                                            \
  69                 if (autofs_debug > 1)                   \
  70                         kprintf("%s: " X "\n",          \
  71                             __func__, ## __VA_ARGS__);  \
  72         } while (0)
  73
  74 #define AUTOFS_WARN(X, ...)                             \
  75         do {                                            \
  76                 if (autofs_debug > 0) {                 \
  77                         kprintf("WARNING: %s: " X "\n", \
  78                             __func__, ## __VA_ARGS__);  \
  79                 }                                       \
  80         } while (0)
  81
  82 #define AUTOFS_FATAL(X, ...)                            \
  83         kprintf("FATAL: %s: " X "\n", __func__, ## __VA_ARGS__)
  84
  85 /*
  86  * APRINTF is only for debugging.
  87  */
  88 #define APRINTF(X, ...)                                 \
  89         kprintf("### %s(%s): " X,                       \
  90             __func__, curproc->p_comm, ## __VA_ARGS__)
  91
  92 #define AUTOFS_LOCK_STATUS(lock)        (lockstatus((lock), curthread))
  93 #define AUTOFS_ASSERT_LOCKED(X)                         \
  94         KKASSERT(AUTOFS_LOCK_STATUS(&(X)->am_lock) & (LK_EXCLUSIVE | LK_SHARED))
  95 #define AUTOFS_ASSERT_XLOCKED(X)                        \
  96         KKASSERT(AUTOFS_LOCK_STATUS(&(X)->am_lock) == LK_EXCLUSIVE)
  97 #define AUTOFS_ASSERT_UNLOCKED(X)                       \
  98         KKASSERT(AUTOFS_LOCK_STATUS(&(X)->am_lock) == 0)
  99
 100 struct autofs_node {
 101         RB_ENTRY(autofs_node)           an_link;
 102         char                            *an_name;
 103         ino_t                           an_ino;
 104         struct autofs_node              *an_parent;
 105         RB_HEAD(autofs_node_tree,
 106             autofs_node)                an_children;
 107         struct autofs_mount             *an_mount;
 108         struct vnode                    *an_vnode;
 109         struct lock                     an_vnode_lock;
 110         bool                            an_cached;
 111         bool                            an_wildcards;
 112         struct callout                  an_callout;
 113         int                             an_retries;
 114         struct timespec                 an_ctime;
 115 };
 116
 117 struct autofs_mount {
 118         TAILQ_ENTRY(autofs_mount)       am_next;
 119         struct autofs_node              *am_root;
 120         struct mount                    *am_mp;
 121         struct lock                     am_lock;
 122         char                            am_from[MAXPATHLEN];
 123         char                            am_on[MAXPATHLEN];
 124         char                            am_options[MAXPATHLEN];
 125         char                            am_prefix[MAXPATHLEN];
 126         ino_t                           am_last_ino;
 127 #if 0
 128         struct netexport                am_export;
 129 #endif
 130 };
 131
 132 struct autofs_request {
 133         TAILQ_ENTRY(autofs_request)     ar_next;
 134         struct autofs_mount             *ar_mount;
 135         int                             ar_id;
 136         bool                            ar_done;
 137         int                             ar_error;
 138         bool                            ar_wildcards;
 139         bool                            ar_in_progress;
 140         char                            ar_from[MAXPATHLEN];
 141         char                            ar_path[MAXPATHLEN];
 142         char                            ar_prefix[MAXPATHLEN];
 143         char                            ar_key[MAXPATHLEN];
 144         char                            ar_options[MAXPATHLEN];
 145         struct timeout_task             ar_task;
 146         volatile u_int                  ar_refcount;
 147 };
 148
 149 struct autofs_softc {
 150         device_t                        sc_dev;
 151         struct cdev                     *sc_cdev;
 152         struct cv                       sc_cv;
 153         struct lock                     sc_lock;
 154         TAILQ_HEAD(, autofs_request)    sc_requests;
 155         bool                            sc_dev_opened;
 156         pid_t                           sc_dev_sid;
 157         int                             sc_last_request_id;
 158 };
 159
 160 int     autofs_init(struct vfsconf *vfsp);
 161 int     autofs_uninit(struct vfsconf *vfsp);
 162 int     autofs_trigger(struct autofs_node *anp, const char *component,
 163             int componentlen);
 164 bool    autofs_cached(struct autofs_node *anp, const char *component,
 165             int componentlen);
 166 char*   autofs_path(struct autofs_node *anp);
 167 void    autofs_flush(struct autofs_mount *amp);
 168 bool    autofs_ignore_thread(void);
 169 int     autofs_node_new(struct autofs_node *parent, struct autofs_mount *amp,
 170             const char *name, int namelen, struct autofs_node **anpp);
 171 int     autofs_node_find(struct autofs_node *parent,
 172             const char *name, int namelen, struct autofs_node **anpp);
 173 void    autofs_node_delete(struct autofs_node *anp);
 174 int     autofs_node_vn(struct autofs_node *anp, struct mount *mp,
 175             int flags, struct vnode **vpp);
 176
 177 static __inline void
 178 autofs_node_cache(struct autofs_node *anp)
 179 {
 180         anp->an_cached = true;
 181 }
 182
 183 static __inline void
 184 autofs_node_uncache(struct autofs_node *anp)
 185 {
 186         anp->an_cached = false;
 187 }
 188
 189 RB_PROTOTYPE(autofs_node_tree, autofs_node, an_link, autofs_node_cmp);
 190
 191 #endif /* !AUTOFS_H */