vfs_hooks.c

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    1 /*      $NetBSD: vfs_hooks.c,v 1.2 2005/12/11 12:24:30 christos 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  * 3. All advertising materials mentioning features or use of this software
   19  *    must display the following acknowledgement:
   20  *      This product includes software developed by the NetBSD
   21  *      Foundation, Inc. and its contributors.
   22  * 4. Neither the name of The NetBSD Foundation nor the names of its
   23  *    contributors may be used to endorse or promote products derived
   24  *    from this software without specific prior written permission.
   25  *
   26  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
   27  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
   28  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   29  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
   30  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   31  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   32  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   33  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   34  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   35  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   36  * POSSIBILITY OF SUCH DAMAGE.
   37  */
   38 
   39 /*
   40  * VFS hooks.
   41  */
   42 
   43 #include <sys/cdefs.h>
   44 __KERNEL_RCSID(0, "$NetBSD: vfs_hooks.c,v 1.2 2005/12/11 12:24:30 christos Exp $");
   45 
   46 #include <sys/param.h>
   47 #include <sys/mount.h>
   48 
   49 /*
   50  * Static list of file system specific hook sets supported by the kernel.
   51  */
   52 __link_set_decl(vfs_hooks, struct vfs_hooks);
   53 
   54 /*
   55  * Initialize a VFS hook set that does nothing.  This is to ensure that
   56  * we have, at the very least, one item in the link set.  Otherwise,
   57  * ld(1) will complain.
   58  */
   59 static struct vfs_hooks null_hooks = {
   60         NULL            /* vh_unmount */
   61 };
   62 VFS_HOOKS_ATTACH(null_hooks);
   63 
   64 /*
   65  * Macro to be used in one of the vfs_hooks_* function for hooks that
   66  * return an error code.  Calls will stop as soon as one of the hooks
   67  * fails.
   68  */
   69 #define VFS_HOOKS_W_ERROR(func, args)                                   \
   70         int error;                                                      \
   71         struct vfs_hooks * const *hp;                                   \
   72                                                                         \
   73         error = 0;                                                      \
   74                                                                         \
   75         __link_set_foreach(hp, vfs_hooks) {                             \
   76                 if ((*hp)-> func != NULL) {                             \
   77                         error = (*hp)-> func args;                      \
   78                         if (error != 0)                                 \
   79                                 break;                                  \
   80                 }                                                       \
   81         }                                                               \
   82                                                                         \
   83         return error;
   84 
   85 /*
   86  * Macro to be used in one of the vfs_hooks_* function for hooks that
   87  * do not return any error code.  All hooks will be executed
   88  * unconditionally.
   89  */
   90 #define VFS_HOOKS_WO_ERROR(func, fargs, hook, hargs)                    \
   91 void                                                                    \
   92 func fargs                                                              \
   93 {                                                                       \
   94         struct vfs_hooks * const *hp;                                   \
   95                                                                         \
   96         __link_set_foreach(hp, vfs_hooks) {                             \
   97                 if ((*hp)-> hook != NULL)                               \
   98                         (*hp)-> hook hargs;                             \
   99         }                                                               \
  100 }
  101 
  102 /*
  103  * Routines to iterate over VFS hooks lists and execute them.
  104  */
  105 
  106 VFS_HOOKS_WO_ERROR(vfs_hooks_unmount, (struct mount *mp), vh_unmount, (mp));
  107 
  108 /*
  109 void
  110 vfs_hooks_unmount(struct mount *mp)
  111 {
  112 
  113         VFS_HOOKS_WO_ERROR(vh_unmount, (mp));
  114 }
  115 */

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

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