268 lines
8.7 KiB
C
268 lines
8.7 KiB
C
/* $NetBSD: amfs_toplvl.c,v 1.4 2005/04/23 18:38:17 christos Exp $ */
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/*
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* Copyright (c) 1997-2005 Erez Zadok
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* Copyright (c) 1990 Jan-Simon Pendry
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* Copyright (c) 1990 Imperial College of Science, Technology & Medicine
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* Copyright (c) 1990 The Regents of the University of California.
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Jan-Simon Pendry at Imperial College, London.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgment:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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*
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* Id: amfs_toplvl.c,v 1.38 2005/04/17 03:05:54 ezk Exp
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*
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*/
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/*
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* Top-level file system
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*/
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif /* HAVE_CONFIG_H */
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#include <am_defs.h>
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#include <amd.h>
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/****************************************************************************
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*** FORWARD DEFINITIONS ***
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****************************************************************************/
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/****************************************************************************
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*** OPS STRUCTURES ***
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****************************************************************************/
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am_ops amfs_toplvl_ops =
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{
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"toplvl",
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amfs_generic_match,
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0, /* amfs_toplvl_init */
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amfs_toplvl_mount,
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amfs_toplvl_umount,
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amfs_generic_lookup_child,
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amfs_generic_mount_child,
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amfs_generic_readdir,
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0, /* amfs_toplvl_readlink */
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amfs_generic_mounted,
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0, /* amfs_toplvl_umounted */
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amfs_generic_find_srvr,
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0, /* amfs_toplvl_get_wchan */
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FS_MKMNT | FS_NOTIMEOUT | FS_BACKGROUND |
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FS_AMQINFO | FS_DIRECTORY, /* nfs_fs_flags */
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#ifdef HAVE_FS_AUTOFS
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AUTOFS_TOPLVL_FS_FLAGS,
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#endif /* HAVE_FS_AUTOFS */
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};
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/****************************************************************************
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*** FUNCTIONS ***
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****************************************************************************/
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static void
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set_auto_attrcache_timeout(char *preopts, char *opts)
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{
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#ifdef MNTTAB_OPT_NOAC
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/*
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* Don't cache attributes - they are changing under the kernel's feet.
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* For example, IRIX5.2 will dispense with nfs lookup calls and hand stale
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* filehandles to getattr unless we disable attribute caching on the
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* automount points.
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*/
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if (gopt.auto_attrcache == 0) {
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sprintf(preopts, ",%s", MNTTAB_OPT_NOAC);
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strcat(opts, preopts);
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}
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#endif /* MNTTAB_OPT_NOAC */
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/*
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* XXX: note that setting these to 0 in the past resulted in an error on
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* some systems, which is why it's better to use "noac" if possible. For
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* now, we're setting everything possible, but if this will cause trouble,
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* then we'll have to condition the remainder of this on OPT_NOAC.
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*/
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#ifdef MNTTAB_OPT_ACTIMEO
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sprintf(preopts, ",%s=%d", MNTTAB_OPT_ACTIMEO, gopt.auto_attrcache);
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strcat(opts, preopts);
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#else /* MNTTAB_OPT_ACTIMEO */
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# ifdef MNTTAB_OPT_ACDIRMIN
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sprintf(preopts, ",%s=%d", MNTTAB_OPT_ACTDIRMIN, gopt.auto_attrcache);
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strcat(opts, preopts);
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# endif /* MNTTAB_OPT_ACDIRMIN */
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# ifdef MNTTAB_OPT_ACDIRMAX
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sprintf(preopts, ",%s=%d", MNTTAB_OPT_ACTDIRMAX, gopt.auto_attrcache);
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strcat(opts, preopts);
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# endif /* MNTTAB_OPT_ACDIRMAX */
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# ifdef MNTTAB_OPT_ACREGMIN
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sprintf(preopts, ",%s=%d", MNTTAB_OPT_ACTREGMIN, gopt.auto_attrcache);
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strcat(opts, preopts);
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# endif /* MNTTAB_OPT_ACREGMIN */
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# ifdef MNTTAB_OPT_ACREGMAX
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sprintf(preopts, ",%s=%d", MNTTAB_OPT_ACTREGMAX, gopt.auto_attrcache);
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strcat(opts, preopts);
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# endif /* MNTTAB_OPT_ACREGMAX */
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#endif /* MNTTAB_OPT_ACTIMEO */
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}
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/*
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* Mount the top-level
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*/
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int
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amfs_toplvl_mount(am_node *mp, mntfs *mf)
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{
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struct stat stb;
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char opts[256], preopts[256];
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int error;
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/*
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* Mounting the automounter.
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* Make sure the mount directory exists, construct
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* the mount options and call the mount_amfs_toplvl routine.
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*/
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if (stat(mp->am_path, &stb) < 0) {
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return errno;
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} else if ((stb.st_mode & S_IFMT) != S_IFDIR) {
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plog(XLOG_WARNING, "%s is not a directory", mp->am_path);
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return ENOTDIR;
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}
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/*
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* Construct some mount options:
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*
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* Tack on magic map=<mapname> option in mtab to emulate
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* SunOS automounter behavior.
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*/
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#ifdef HAVE_FS_AUTOFS
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if (mf->mf_flags & MFF_IS_AUTOFS) {
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autofs_get_opts(opts, mp->am_autofs_fh);
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} else
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#endif /* HAVE_FS_AUTOFS */
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{
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preopts[0] = '\0';
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#ifdef MNTTAB_OPT_INTR
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strlcat(preopts, MNTTAB_OPT_INTR, sizeof(preopts));
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strlcat(preopts, ",", sizeof(preopts));
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#endif /* MNTTAB_OPT_INTR */
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#ifdef MNTTAB_OPT_IGNORE
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strlcat(preopts, MNTTAB_OPT_IGNORE, sizeof(preopts));
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strlcat(preopts, ",", sizeof(preopts));
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#endif /* MNTTAB_OPT_IGNORE */
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#ifdef WANT_TIMEO_AND_RETRANS_ON_TOPLVL
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sprintf(opts, "%s%s,%s=%d,%s=%d,%s=%d,%s,map=%s",
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#else /* WANT_TIMEO_AND_RETRANS_ON_TOPLVL */
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sprintf(opts, "%s%s,%s=%d,%s,map=%s",
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#endif /* WANT_TIMEO_AND_RETRANS_ON_TOPLVL */
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preopts,
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MNTTAB_OPT_RW,
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MNTTAB_OPT_PORT, nfs_port,
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#ifdef WANT_TIMEO_AND_RETRANS_ON_TOPLVL
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/* note: TIMEO+RETRANS for toplvl are only "udp" currently */
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MNTTAB_OPT_TIMEO, gopt.amfs_auto_timeo[AMU_TYPE_UDP],
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MNTTAB_OPT_RETRANS, gopt.amfs_auto_retrans[AMU_TYPE_UDP],
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#endif /* WANT_TIMEO_AND_RETRANS_ON_TOPLVL */
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mf->mf_ops->fs_type, mf->mf_info);
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#ifdef MNTTAB_OPT_NOAC
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if (gopt.auto_attrcache == 0) {
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strcat(opts, ",");
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strcat(opts, MNTTAB_OPT_NOAC);
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} else
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#endif /* MNTTAB_OPT_NOAC */
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set_auto_attrcache_timeout(preopts, opts);
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}
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/* now do the mount */
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error = amfs_mount(mp, mf, opts);
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if (error) {
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errno = error;
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plog(XLOG_FATAL, "amfs_toplvl_mount: amfs_mount failed: %m");
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return error;
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}
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return 0;
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}
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/*
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* Unmount a top-level automount node
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*/
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int
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amfs_toplvl_umount(am_node *mp, mntfs *mf)
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{
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struct stat stb;
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int on_autofs = mf->mf_flags & MFF_ON_AUTOFS;
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int error;
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again:
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/*
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* The lstat is needed if this mount is type=direct.
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* When that happens, the kernel cache gets confused
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* between the underlying type (dir) and the mounted
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* type (link) and so needs to be re-synced before
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* the unmount. This is all because the unmount system
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* call follows links and so can't actually unmount
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* a link (stupid!). It was noted that doing an ls -ld
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* of the mount point to see why things were not working
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* actually fixed the problem - so simulate an ls -ld here.
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*/
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if (lstat(mp->am_path, &stb) < 0) {
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error = errno;
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dlog("lstat(%s): %m", mp->am_path);
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goto out;
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}
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if ((stb.st_mode & S_IFMT) != S_IFDIR) {
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plog(XLOG_ERROR, "amfs_toplvl_umount: %s is not a directory, aborting.", mp->am_path);
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error = ENOTDIR;
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goto out;
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}
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error = UMOUNT_FS(mp->am_path, mnttab_file_name, on_autofs);
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if (error == EBUSY) {
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#ifdef HAVE_FS_AUTOFS
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/*
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* autofs mounts are "in place", so it is possible
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* that we can't just unmount our mount points and go away.
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* If that's the case, just give up.
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*/
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if (mf->mf_flags & MFF_IS_AUTOFS)
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return error;
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#endif /* HAVE_FS_AUTOFS */
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plog(XLOG_WARNING, "amfs_toplvl_unmount retrying %s in 1s", mp->am_path);
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sleep(1); /* XXX */
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goto again;
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}
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out:
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return error;
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}
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