1/* $NetBSD$ */ 2 3/* 4 * Copyright (c) 1997-2014 Erez Zadok 5 * Copyright (c) 1990 Jan-Simon Pendry 6 * Copyright (c) 1990 Imperial College of Science, Technology & Medicine 7 * Copyright (c) 1990 The Regents of the University of California. 8 * All rights reserved. 9 * 10 * This code is derived from software contributed to Berkeley by 11 * Jan-Simon Pendry at Imperial College, London. 12 * 13 * Redistribution and use in source and binary forms, with or without 14 * modification, are permitted provided that the following conditions 15 * are met: 16 * 1. Redistributions of source code must retain the above copyright 17 * notice, this list of conditions and the following disclaimer. 18 * 2. Redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions and the following disclaimer in the 20 * documentation and/or other materials provided with the distribution. 21 * 3. Neither the name of the University nor the names of its contributors 22 * may be used to endorse or promote products derived from this software 23 * without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 35 * SUCH DAMAGE. 36 * 37 * 38 * File: am-utils/amd/amfs_union.c 39 * 40 */ 41 42/* 43 * Union automounter file system 44 */ 45 46#ifdef HAVE_CONFIG_H 47# include <config.h> 48#endif /* HAVE_CONFIG_H */ 49#include <am_defs.h> 50#include <amd.h> 51 52/**************************************************************************** 53 *** FORWARD DEFINITIONS *** 54 ****************************************************************************/ 55static int create_amfs_union_node(char *dir, opaque_t arg); 56static void amfs_union_mounted(mntfs *mf); 57 58 59/**************************************************************************** 60 *** OPS STRUCTURES *** 61 ****************************************************************************/ 62am_ops amfs_union_ops = 63{ 64 "union", 65 amfs_generic_match, 66 0, /* amfs_union_init */ 67 amfs_toplvl_mount, 68 amfs_toplvl_umount, 69 amfs_generic_lookup_child, 70 amfs_generic_mount_child, 71 amfs_generic_readdir, 72 0, /* amfs_union_readlink */ 73 amfs_union_mounted, 74 0, /* amfs_union_umounted */ 75 amfs_generic_find_srvr, 76 0, /* amfs_union_get_wchan */ 77 FS_MKMNT | FS_NOTIMEOUT | FS_BACKGROUND | FS_AMQINFO | FS_DIRECTORY, 78#ifdef HAVE_FS_AUTOFS 79 AUTOFS_UNION_FS_FLAGS, 80#endif /* HAVE_FS_AUTOFS */ 81}; 82 83 84/* 85 * Create a reference to a union'ed entry 86 * XXX: this function may not be used anywhere... 87 */ 88static int 89create_amfs_union_node(char *dir, opaque_t arg) 90{ 91 if (!STREQ(dir, "/defaults")) { 92 int error = 0; 93 am_node *am; 94 am = amfs_generic_lookup_child(arg, dir, &error, VLOOK_CREATE); 95 if (am && error < 0) 96 (void)amfs_generic_mount_child(am, &error); 97 if (error > 0) { 98 errno = error; /* XXX */ 99 plog(XLOG_ERROR, "unionfs: could not mount %s: %m", dir); 100 } 101 return error; 102 } 103 return 0; 104} 105 106 107static void 108amfs_union_mounted(mntfs *mf) 109{ 110 int index; 111 am_node *mp; 112 113 amfs_mkcacheref(mf); 114 115 /* 116 * Having made the union mount point, 117 * populate all the entries... 118 */ 119 for (mp = get_first_exported_ap(&index); 120 mp; 121 mp = get_next_exported_ap(&index)) { 122 if (mp->am_al->al_mnt == mf) { 123 /* return value from create_amfs_union_node is ignored by mapc_keyiter */ 124 (void) mapc_keyiter((mnt_map *) mp->am_al->al_mnt->mf_private, 125 create_amfs_union_node, 126 mp); 127 break; 128 } 129 } 130} 131