vfs_hooks.c

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    1 /*      $NetBSD: vfs_hooks.c,v 1.6 2009/03/15 17:14:40 cegger Exp $     */
    2 
    3 /*-
    4  * Copyright (c) 2005 The NetBSD Foundation, Inc.
    5  * All rights reserved.
    6  *
    7  * This code is derived from software contributed to The NetBSD Foundation
    8  * by Julio M. Merino Vidal.
    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 NETBSD FOUNDATION, INC. AND CONTRIBUTORS
   20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
   21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
   23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   29  * POSSIBILITY OF SUCH DAMAGE.
   30  */
   31 
   32 /*
   33  * VFS hooks.
   34  */
   35 
   36 #include <sys/cdefs.h>
   37 __KERNEL_RCSID(0, "$NetBSD: vfs_hooks.c,v 1.6 2009/03/15 17:14:40 cegger Exp $");
   38 
   39 #include <sys/param.h>
   40 #include <sys/queue.h>
   41 #include <sys/mount.h>
   42 #include <sys/mutex.h>
   43 
   44 LIST_HEAD(vfs_hooks_head, vfs_hooks) vfs_hooks_head =
   45     LIST_HEAD_INITIALIZER(vfs_hooks_head);
   46 
   47 kmutex_t vfs_hooks_lock;
   48 
   49 void
   50 vfs_hooks_init(void)
   51 {
   52 
   53         mutex_init(&vfs_hooks_lock, MUTEX_DEFAULT, IPL_NONE);
   54 }
   55 
   56 int
   57 vfs_hooks_attach(struct vfs_hooks *vfs_hooks)
   58 {
   59 
   60         mutex_enter(&vfs_hooks_lock);
   61         LIST_INSERT_HEAD(&vfs_hooks_head, vfs_hooks, vfs_hooks_list);
   62         mutex_exit(&vfs_hooks_lock);
   63 
   64         return (0);
   65 }
   66 
   67 int
   68 vfs_hooks_detach(struct vfs_hooks *vfs_hooks)
   69 {
   70         struct vfs_hooks *hp;
   71         int ret = 0;
   72 
   73         mutex_enter(&vfs_hooks_lock);
   74         LIST_FOREACH(hp, &vfs_hooks_head, vfs_hooks_list) {
   75                 if (hp == vfs_hooks) {
   76                         LIST_REMOVE(hp, vfs_hooks_list);
   77                         break;
   78                 }
   79         }
   80         if (hp == NULL)
   81                 ret = ESRCH;
   82         mutex_exit(&vfs_hooks_lock);
   83 
   84         return (ret);
   85 }
   86 
   87 /*
   88  * Macro to be used in one of the vfs_hooks_* function for hooks that
   89  * return an error code.  Calls will stop as soon as one of the hooks
   90  * fails.
   91  */
   92 #define VFS_HOOKS_W_ERROR(func, fargs, hook, hargs)                     \
   93 int                                                                     \
   94 func fargs                                                              \
   95 {                                                                       \
   96         int error;                                                      \
   97         struct vfs_hooks *hp;                                           \
   98                                                                         \
   99         error = EJUSTRETURN;                                            \
  100                                                                         \
  101         mutex_enter(&vfs_hooks_lock);                                   \
  102         LIST_FOREACH(hp, &vfs_hooks_head, vfs_hooks_list) {             \
  103                 if (hp-> hook != NULL) {                                \
  104                         error = hp-> hook hargs;                        \
  105                         if (error != 0)                                 \
  106                                 break;                                  \
  107                 }                                                       \
  108         }                                                               \
  109         mutex_exit(&vfs_hooks_lock);                                    \
  110                                                                         \
  111         return error;                                                   \
  112 }
  113 
  114 /*
  115  * Macro to be used in one of the vfs_hooks_* function for hooks that
  116  * do not return any error code.  All hooks will be executed
  117  * unconditionally.
  118  */
  119 #define VFS_HOOKS_WO_ERROR(func, fargs, hook, hargs)                    \
  120 void                                                                    \
  121 func fargs                                                              \
  122 {                                                                       \
  123         struct vfs_hooks *hp;                                           \
  124                                                                         \
  125         mutex_enter(&vfs_hooks_lock);                                   \
  126         LIST_FOREACH(hp, &vfs_hooks_head, vfs_hooks_list) {             \
  127                 if (hp-> hook != NULL)                                  \
  128                         hp-> hook hargs;                                \
  129         }                                                               \
  130         mutex_exit(&vfs_hooks_lock);                                    \
  131 }
  132 
  133 /*
  134  * Routines to iterate over VFS hooks lists and execute them.
  135  */
  136 
  137 VFS_HOOKS_WO_ERROR(vfs_hooks_unmount, (struct mount *mp), vh_unmount, (mp));
  138 VFS_HOOKS_W_ERROR(vfs_hooks_reexport, (struct mount *mp, const char *path, void *data), vh_reexport, (mp, path, data));

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FreeBSD/Linux Kernel Cross Reference sys/kern/vfs_hooks.c

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sys/kern/vfs_hooks.c