vfs_hooks.c revision 1.2.18.2
1 1.2.18.2 yamt /* $NetBSD: vfs_hooks.c,v 1.2.18.2 2006/06/21 15:09:39 yamt Exp $ */ 2 1.2.18.2 yamt 3 1.2.18.2 yamt /*- 4 1.2.18.2 yamt * Copyright (c) 2005 The NetBSD Foundation, Inc. 5 1.2.18.2 yamt * All rights reserved. 6 1.2.18.2 yamt * 7 1.2.18.2 yamt * This code is derived from software contributed to The NetBSD Foundation 8 1.2.18.2 yamt * by Julio M. Merino Vidal. 9 1.2.18.2 yamt * 10 1.2.18.2 yamt * Redistribution and use in source and binary forms, with or without 11 1.2.18.2 yamt * modification, are permitted provided that the following conditions 12 1.2.18.2 yamt * are met: 13 1.2.18.2 yamt * 1. Redistributions of source code must retain the above copyright 14 1.2.18.2 yamt * notice, this list of conditions and the following disclaimer. 15 1.2.18.2 yamt * 2. Redistributions in binary form must reproduce the above copyright 16 1.2.18.2 yamt * notice, this list of conditions and the following disclaimer in the 17 1.2.18.2 yamt * documentation and/or other materials provided with the distribution. 18 1.2.18.2 yamt * 3. All advertising materials mentioning features or use of this software 19 1.2.18.2 yamt * must display the following acknowledgement: 20 1.2.18.2 yamt * This product includes software developed by the NetBSD 21 1.2.18.2 yamt * Foundation, Inc. and its contributors. 22 1.2.18.2 yamt * 4. Neither the name of The NetBSD Foundation nor the names of its 23 1.2.18.2 yamt * contributors may be used to endorse or promote products derived 24 1.2.18.2 yamt * from this software without specific prior written permission. 25 1.2.18.2 yamt * 26 1.2.18.2 yamt * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 1.2.18.2 yamt * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 1.2.18.2 yamt * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 1.2.18.2 yamt * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 1.2.18.2 yamt * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 1.2.18.2 yamt * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 1.2.18.2 yamt * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 1.2.18.2 yamt * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 1.2.18.2 yamt * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 1.2.18.2 yamt * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 1.2.18.2 yamt * POSSIBILITY OF SUCH DAMAGE. 37 1.2.18.2 yamt */ 38 1.2.18.2 yamt 39 1.2.18.2 yamt /* 40 1.2.18.2 yamt * VFS hooks. 41 1.2.18.2 yamt */ 42 1.2.18.2 yamt 43 1.2.18.2 yamt #include <sys/cdefs.h> 44 1.2.18.2 yamt __KERNEL_RCSID(0, "$NetBSD: vfs_hooks.c,v 1.2.18.2 2006/06/21 15:09:39 yamt Exp $"); 45 1.2.18.2 yamt 46 1.2.18.2 yamt #include <sys/param.h> 47 1.2.18.2 yamt #include <sys/mount.h> 48 1.2.18.2 yamt 49 1.2.18.2 yamt /* 50 1.2.18.2 yamt * Static list of file system specific hook sets supported by the kernel. 51 1.2.18.2 yamt */ 52 1.2.18.2 yamt __link_set_decl(vfs_hooks, struct vfs_hooks); 53 1.2.18.2 yamt 54 1.2.18.2 yamt /* 55 1.2.18.2 yamt * Initialize a VFS hook set that does nothing. This is to ensure that 56 1.2.18.2 yamt * we have, at the very least, one item in the link set. Otherwise, 57 1.2.18.2 yamt * ld(1) will complain. 58 1.2.18.2 yamt */ 59 1.2.18.2 yamt static struct vfs_hooks null_hooks = { 60 1.2.18.2 yamt NULL /* vh_unmount */ 61 1.2.18.2 yamt }; 62 1.2.18.2 yamt VFS_HOOKS_ATTACH(null_hooks); 63 1.2.18.2 yamt 64 1.2.18.2 yamt /* 65 1.2.18.2 yamt * Macro to be used in one of the vfs_hooks_* function for hooks that 66 1.2.18.2 yamt * return an error code. Calls will stop as soon as one of the hooks 67 1.2.18.2 yamt * fails. 68 1.2.18.2 yamt */ 69 1.2.18.2 yamt #define VFS_HOOKS_W_ERROR(func, args) \ 70 1.2.18.2 yamt int error; \ 71 1.2.18.2 yamt struct vfs_hooks * const *hp; \ 72 1.2.18.2 yamt \ 73 1.2.18.2 yamt error = 0; \ 74 1.2.18.2 yamt \ 75 1.2.18.2 yamt __link_set_foreach(hp, vfs_hooks) { \ 76 1.2.18.2 yamt if ((*hp)-> func != NULL) { \ 77 1.2.18.2 yamt error = (*hp)-> func args; \ 78 1.2.18.2 yamt if (error != 0) \ 79 1.2.18.2 yamt break; \ 80 1.2.18.2 yamt } \ 81 1.2.18.2 yamt } \ 82 1.2.18.2 yamt \ 83 1.2.18.2 yamt return error; 84 1.2.18.2 yamt 85 1.2.18.2 yamt /* 86 1.2.18.2 yamt * Macro to be used in one of the vfs_hooks_* function for hooks that 87 1.2.18.2 yamt * do not return any error code. All hooks will be executed 88 1.2.18.2 yamt * unconditionally. 89 1.2.18.2 yamt */ 90 1.2.18.2 yamt #define VFS_HOOKS_WO_ERROR(func, fargs, hook, hargs) \ 91 1.2.18.2 yamt void \ 92 1.2.18.2 yamt func fargs \ 93 1.2.18.2 yamt { \ 94 1.2.18.2 yamt struct vfs_hooks * const *hp; \ 95 1.2.18.2 yamt \ 96 1.2.18.2 yamt __link_set_foreach(hp, vfs_hooks) { \ 97 1.2.18.2 yamt if ((*hp)-> hook != NULL) \ 98 1.2.18.2 yamt (*hp)-> hook hargs; \ 99 1.2.18.2 yamt } \ 100 1.2.18.2 yamt } 101 1.2.18.2 yamt 102 1.2.18.2 yamt /* 103 1.2.18.2 yamt * Routines to iterate over VFS hooks lists and execute them. 104 1.2.18.2 yamt */ 105 1.2.18.2 yamt 106 1.2.18.2 yamt VFS_HOOKS_WO_ERROR(vfs_hooks_unmount, (struct mount *mp), vh_unmount, (mp)); 107 1.2.18.2 yamt 108 1.2.18.2 yamt /* 109 1.2.18.2 yamt void 110 1.2.18.2 yamt vfs_hooks_unmount(struct mount *mp) 111 1.2.18.2 yamt { 112 1.2.18.2 yamt 113 1.2.18.2 yamt VFS_HOOKS_WO_ERROR(vh_unmount, (mp)); 114 1.2.18.2 yamt } 115 1.2.18.2 yamt */ 116
Indexes created Tue Sep 23 22:09:46 GMT 2025