/* $NetBSD: srvr_amfs_auto.c,v 1.1.1.3 2015/01/17 16:34:15 christos Exp $ */ /* * Copyright (c) 1997-2014 Erez Zadok * Copyright (c) 1989 Jan-Simon Pendry * Copyright (c) 1989 Imperial College of Science, Technology & Medicine * Copyright (c) 1989 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/srvr_amfs_auto.c * */ /* * Automount FS server ("localhost") modeling */ #ifdef HAVE_CONFIG_H # include #endif /* HAVE_CONFIG_H */ #include #include /* globals */ /* statics */ static qelem amfs_auto_srvr_list = {&amfs_auto_srvr_list, &amfs_auto_srvr_list}; static fserver *localhost; /* * Find an nfs server for the local host */ fserver * amfs_generic_find_srvr(mntfs *mf) { fserver *fs = localhost; if (!fs) { fs = ALLOC(struct fserver); fs->fs_refc = 0; fs->fs_host = xstrdup("localhost"); fs->fs_ip = NULL; fs->fs_cid = 0; fs->fs_pinger = AM_PINGER; fs->fs_flags = FSF_VALID | FSF_PING_UNINIT; fs->fs_type = "local"; fs->fs_private = NULL; fs->fs_prfree = NULL; ins_que(&fs->fs_q, &amfs_auto_srvr_list); srvrlog(fs, "starts up"); localhost = fs; } fs->fs_refc++; return fs; } /***************************************************************************** *** GENERIC ROUTINES FOLLOW *****************************************************************************/ /* * Wakeup anything waiting for this server */ void wakeup_srvr(fserver *fs) { fs->fs_flags &= ~FSF_WANT; wakeup((voidp) fs); } /* * Called when final ttl of server has expired */ static void timeout_srvr(voidp v) { fserver *fs = v; /* * If the reference count is still zero then * we are free to remove this node */ if (fs->fs_refc == 0) { dlog("Deleting file server %s", fs->fs_host); if (fs->fs_flags & FSF_WANT) wakeup_srvr(fs); /* * Remove from queue. */ rem_que(&fs->fs_q); /* * (Possibly) call the private free routine. */ if (fs->fs_private && fs->fs_prfree) (*fs->fs_prfree) (fs->fs_private); /* * Free the net address */ XFREE(fs->fs_ip); /* * Free the host name. */ XFREE(fs->fs_host); /* * Discard the fserver object. */ XFREE(fs); } } /* * Free a file server */ void free_srvr(fserver *fs) { if (--fs->fs_refc == 0) { /* * The reference count is now zero, * so arrange for this node to be * removed in AM_TTL seconds if no * other mntfs is referencing it. */ int ttl = (FSRV_ERROR(fs) || FSRV_ISDOWN(fs)) ? 19 : AM_TTL; dlog("Last hard reference to file server %s - will timeout in %ds", fs->fs_host, ttl); if (fs->fs_cid) { untimeout(fs->fs_cid); /* * Turn off pinging - XXX */ fs->fs_flags &= ~FSF_PINGING; } /* * Keep structure lying around for a while */ fs->fs_cid = timeout(ttl, timeout_srvr, (voidp) fs); /* * Mark the fileserver down and invalid again */ fs->fs_flags &= ~FSF_VALID; fs->fs_flags |= FSF_DOWN; } } /* * Make a duplicate fserver reference */ fserver * dup_srvr(fserver *fs) { fs->fs_refc++; return fs; } /* * Log state change */ void srvrlog(fserver *fs, char *state) { plog(XLOG_INFO, "file server %s, type %s, state %s", fs->fs_host, fs->fs_type, state); }