/* $NetBSD: amfs_union.c,v 1.1.1.3 2015/01/17 16:34:15 christos Exp $ */ /* * Copyright (c) 1997-2014 Erez Zadok * Copyright (c) 1990 Jan-Simon Pendry * Copyright (c) 1990 Imperial College of Science, Technology & Medicine * Copyright (c) 1990 The Regents of the University of California. * All rights reserved. * * This code is derived from software contributed to Berkeley by * Jan-Simon Pendry at Imperial College, London. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * * File: am-utils/amd/amfs_union.c * */ /* * Union automounter file system */ #ifdef HAVE_CONFIG_H # include #endif /* HAVE_CONFIG_H */ #include #include /**************************************************************************** *** FORWARD DEFINITIONS *** ****************************************************************************/ static int create_amfs_union_node(char *dir, opaque_t arg); static void amfs_union_mounted(mntfs *mf); /**************************************************************************** *** OPS STRUCTURES *** ****************************************************************************/ am_ops amfs_union_ops = { "union", amfs_generic_match, 0, /* amfs_union_init */ amfs_toplvl_mount, amfs_toplvl_umount, amfs_generic_lookup_child, amfs_generic_mount_child, amfs_generic_readdir, 0, /* amfs_union_readlink */ amfs_union_mounted, 0, /* amfs_union_umounted */ amfs_generic_find_srvr, 0, /* amfs_union_get_wchan */ FS_MKMNT | FS_NOTIMEOUT | FS_BACKGROUND | FS_AMQINFO | FS_DIRECTORY, #ifdef HAVE_FS_AUTOFS AUTOFS_UNION_FS_FLAGS, #endif /* HAVE_FS_AUTOFS */ }; /* * Create a reference to a union'ed entry * XXX: this function may not be used anywhere... */ static int create_amfs_union_node(char *dir, opaque_t arg) { if (!STREQ(dir, "/defaults")) { int error = 0; am_node *am; am = amfs_generic_lookup_child(arg, dir, &error, VLOOK_CREATE); if (am && error < 0) (void)amfs_generic_mount_child(am, &error); if (error > 0) { errno = error; /* XXX */ plog(XLOG_ERROR, "unionfs: could not mount %s: %m", dir); } return error; } return 0; } static void amfs_union_mounted(mntfs *mf) { int index; am_node *mp; amfs_mkcacheref(mf); /* * Having made the union mount point, * populate all the entries... */ for (mp = get_first_exported_ap(&index); mp; mp = get_next_exported_ap(&index)) { if (mp->am_al->al_mnt == mf) { /* return value from create_amfs_union_node is ignored by mapc_keyiter */ (void) mapc_keyiter((mnt_map *) mp->am_al->al_mnt->mf_private, create_amfs_union_node, mp); break; } } }