/* $NetBSD: amfs_toplvl.c,v 1.4 2005/04/23 18:38:17 christos Exp $ */ /* * Copyright (c) 1997-2005 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. All advertising materials mentioning features or use of this software * must display the following acknowledgment: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. 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. * * * Id: amfs_toplvl.c,v 1.38 2005/04/17 03:05:54 ezk Exp * */ /* * Top-level file system */ #ifdef HAVE_CONFIG_H # include #endif /* HAVE_CONFIG_H */ #include #include /**************************************************************************** *** FORWARD DEFINITIONS *** ****************************************************************************/ /**************************************************************************** *** OPS STRUCTURES *** ****************************************************************************/ am_ops amfs_toplvl_ops = { "toplvl", amfs_generic_match, 0, /* amfs_toplvl_init */ amfs_toplvl_mount, amfs_toplvl_umount, amfs_generic_lookup_child, amfs_generic_mount_child, amfs_generic_readdir, 0, /* amfs_toplvl_readlink */ amfs_generic_mounted, 0, /* amfs_toplvl_umounted */ amfs_generic_find_srvr, 0, /* amfs_toplvl_get_wchan */ FS_MKMNT | FS_NOTIMEOUT | FS_BACKGROUND | FS_AMQINFO | FS_DIRECTORY, /* nfs_fs_flags */ #ifdef HAVE_FS_AUTOFS AUTOFS_TOPLVL_FS_FLAGS, #endif /* HAVE_FS_AUTOFS */ }; /**************************************************************************** *** FUNCTIONS *** ****************************************************************************/ static void set_auto_attrcache_timeout(char *preopts, char *opts) { #ifdef MNTTAB_OPT_NOAC /* * Don't cache attributes - they are changing under the kernel's feet. * For example, IRIX5.2 will dispense with nfs lookup calls and hand stale * filehandles to getattr unless we disable attribute caching on the * automount points. */ if (gopt.auto_attrcache == 0) { sprintf(preopts, ",%s", MNTTAB_OPT_NOAC); strcat(opts, preopts); } #endif /* MNTTAB_OPT_NOAC */ /* * XXX: note that setting these to 0 in the past resulted in an error on * some systems, which is why it's better to use "noac" if possible. For * now, we're setting everything possible, but if this will cause trouble, * then we'll have to condition the remainder of this on OPT_NOAC. */ #ifdef MNTTAB_OPT_ACTIMEO sprintf(preopts, ",%s=%d", MNTTAB_OPT_ACTIMEO, gopt.auto_attrcache); strcat(opts, preopts); #else /* MNTTAB_OPT_ACTIMEO */ # ifdef MNTTAB_OPT_ACDIRMIN sprintf(preopts, ",%s=%d", MNTTAB_OPT_ACTDIRMIN, gopt.auto_attrcache); strcat(opts, preopts); # endif /* MNTTAB_OPT_ACDIRMIN */ # ifdef MNTTAB_OPT_ACDIRMAX sprintf(preopts, ",%s=%d", MNTTAB_OPT_ACTDIRMAX, gopt.auto_attrcache); strcat(opts, preopts); # endif /* MNTTAB_OPT_ACDIRMAX */ # ifdef MNTTAB_OPT_ACREGMIN sprintf(preopts, ",%s=%d", MNTTAB_OPT_ACTREGMIN, gopt.auto_attrcache); strcat(opts, preopts); # endif /* MNTTAB_OPT_ACREGMIN */ # ifdef MNTTAB_OPT_ACREGMAX sprintf(preopts, ",%s=%d", MNTTAB_OPT_ACTREGMAX, gopt.auto_attrcache); strcat(opts, preopts); # endif /* MNTTAB_OPT_ACREGMAX */ #endif /* MNTTAB_OPT_ACTIMEO */ } /* * Mount the top-level */ int amfs_toplvl_mount(am_node *mp, mntfs *mf) { struct stat stb; char opts[256], preopts[256]; int error; /* * Mounting the automounter. * Make sure the mount directory exists, construct * the mount options and call the mount_amfs_toplvl routine. */ if (stat(mp->am_path, &stb) < 0) { return errno; } else if ((stb.st_mode & S_IFMT) != S_IFDIR) { plog(XLOG_WARNING, "%s is not a directory", mp->am_path); return ENOTDIR; } /* * Construct some mount options: * * Tack on magic map= option in mtab to emulate * SunOS automounter behavior. */ #ifdef HAVE_FS_AUTOFS if (mf->mf_flags & MFF_IS_AUTOFS) { autofs_get_opts(opts, mp->am_autofs_fh); } else #endif /* HAVE_FS_AUTOFS */ { preopts[0] = '\0'; #ifdef MNTTAB_OPT_INTR strlcat(preopts, MNTTAB_OPT_INTR, sizeof(preopts)); strlcat(preopts, ",", sizeof(preopts)); #endif /* MNTTAB_OPT_INTR */ #ifdef MNTTAB_OPT_IGNORE strlcat(preopts, MNTTAB_OPT_IGNORE, sizeof(preopts)); strlcat(preopts, ",", sizeof(preopts)); #endif /* MNTTAB_OPT_IGNORE */ #ifdef WANT_TIMEO_AND_RETRANS_ON_TOPLVL sprintf(opts, "%s%s,%s=%d,%s=%d,%s=%d,%s,map=%s", #else /* WANT_TIMEO_AND_RETRANS_ON_TOPLVL */ sprintf(opts, "%s%s,%s=%d,%s,map=%s", #endif /* WANT_TIMEO_AND_RETRANS_ON_TOPLVL */ preopts, MNTTAB_OPT_RW, MNTTAB_OPT_PORT, nfs_port, #ifdef WANT_TIMEO_AND_RETRANS_ON_TOPLVL /* note: TIMEO+RETRANS for toplvl are only "udp" currently */ MNTTAB_OPT_TIMEO, gopt.amfs_auto_timeo[AMU_TYPE_UDP], MNTTAB_OPT_RETRANS, gopt.amfs_auto_retrans[AMU_TYPE_UDP], #endif /* WANT_TIMEO_AND_RETRANS_ON_TOPLVL */ mf->mf_ops->fs_type, mf->mf_info); #ifdef MNTTAB_OPT_NOAC if (gopt.auto_attrcache == 0) { strcat(opts, ","); strcat(opts, MNTTAB_OPT_NOAC); } else #endif /* MNTTAB_OPT_NOAC */ set_auto_attrcache_timeout(preopts, opts); } /* now do the mount */ error = amfs_mount(mp, mf, opts); if (error) { errno = error; plog(XLOG_FATAL, "amfs_toplvl_mount: amfs_mount failed: %m"); return error; } return 0; } /* * Unmount a top-level automount node */ int amfs_toplvl_umount(am_node *mp, mntfs *mf) { struct stat stb; int on_autofs = mf->mf_flags & MFF_ON_AUTOFS; int error; again: /* * The lstat is needed if this mount is type=direct. * When that happens, the kernel cache gets confused * between the underlying type (dir) and the mounted * type (link) and so needs to be re-synced before * the unmount. This is all because the unmount system * call follows links and so can't actually unmount * a link (stupid!). It was noted that doing an ls -ld * of the mount point to see why things were not working * actually fixed the problem - so simulate an ls -ld here. */ if (lstat(mp->am_path, &stb) < 0) { error = errno; dlog("lstat(%s): %m", mp->am_path); goto out; } if ((stb.st_mode & S_IFMT) != S_IFDIR) { plog(XLOG_ERROR, "amfs_toplvl_umount: %s is not a directory, aborting.", mp->am_path); error = ENOTDIR; goto out; } error = UMOUNT_FS(mp->am_path, mnttab_file_name, on_autofs); if (error == EBUSY) { #ifdef HAVE_FS_AUTOFS /* * autofs mounts are "in place", so it is possible * that we can't just unmount our mount points and go away. * If that's the case, just give up. */ if (mf->mf_flags & MFF_IS_AUTOFS) return error; #endif /* HAVE_FS_AUTOFS */ plog(XLOG_WARNING, "amfs_toplvl_unmount retrying %s in 1s", mp->am_path); sleep(1); /* XXX */ goto again; } out: return error; }