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NetBSD/dist/am-utils/amd/restart.c

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/* $NetBSD: restart.c,v 1.1.1.9 2005/09/20 17:14:53 rpaulo 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.
*
*
* File: am-utils/amd/restart.c
*
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif /* HAVE_CONFIG_H */
#include <am_defs.h>
#include <amd.h>
static void
restart_fake_mntfs(mntent_t *me, am_ops *fs_ops)
{
mntfs *mf;
am_opts mo;
char *cp;
/*
* Partially fake up an opts structure
*/
memset(&mo, 0, sizeof(mo));
mo.opt_rhost = 0;
mo.opt_rfs = 0;
cp = strchr(me->mnt_fsname, ':');
if (cp) {
*cp = '\0';
mo.opt_rhost = strdup(me->mnt_fsname);
mo.opt_rfs = strdup(cp + 1);
*cp = ':';
} else if (STREQ(me->mnt_type, MNTTAB_TYPE_NFS)) {
/*
* Hacky workaround for mnttab NFS entries that only list the server
*/
plog(XLOG_WARNING, "NFS server entry assumed to be %s:/", me->mnt_fsname);
mo.opt_rhost = strdup(me->mnt_fsname);
mo.opt_rfs = strdup("/");
me->mnt_fsname = str3cat(me->mnt_fsname, mo.opt_rhost, ":", "/");
}
mo.opt_fs = me->mnt_dir;
mo.opt_opts = me->mnt_opts;
/*
* Make a new mounted filesystem
*/
mf = find_mntfs(fs_ops, &mo, me->mnt_dir,
me->mnt_fsname, "", me->mnt_opts, "");
if (mf->mf_refc == 1) {
mf->mf_flags |= MFF_RESTART | MFF_MOUNTED;
mf->mf_error = 0; /* Already mounted correctly */
mf->mf_fo = 0;
/*
* Only timeout non-NFS entries
*/
if (!STREQ(me->mnt_type, MNTTAB_TYPE_NFS))
mf->mf_flags |= MFF_RSTKEEP;
if (fs_ops->fs_init) {
/*
* Don't care whether this worked since
* it is checked again when the fs is
* inherited.
*/
(void) (*fs_ops->fs_init) (mf);
}
plog(XLOG_INFO, "%s restarted fstype %s on %s, flags 0x%x",
me->mnt_fsname, fs_ops->fs_type, me->mnt_dir, mf->mf_flags);
} else {
/* Something strange happened - two mounts at the same place! */
free_mntfs(mf);
}
/*
* Clean up mo
*/
if (mo.opt_rhost)
XFREE(mo.opt_rhost);
if (mo.opt_rfs)
XFREE(mo.opt_rfs);
}
/*
* Handle an amd restart.
*
* Scan through the mount list finding all "interesting" mount points.
* Next hack up partial data structures and add the mounted file
* system to the list of known filesystems.
*
* This module relies on internal details of other components. If
* you change something else make *sure* restart() still works.
*/
void
restart(void)
{
mntlist *ml, *mlp;
/*
* Read the existing mount table. For each entry, find nfs, ufs or auto
* mounts and create a partial am_node to represent it.
*/
for (mlp = ml = read_mtab("restart", mnttab_file_name);
mlp;
mlp = mlp->mnext) {
mntent_t *me = mlp->mnt;
am_ops *fs_ops = 0;
if (STREQ(me->mnt_type, MNTTAB_TYPE_NFS)) {
/*
* NFS entry, or possibly an Amd entry...
* The mnt_fsname for daemon mount points is
* host:(pidXXX)
* or (seen on Solaris)
* host:daemon(pidXXX)
*/
char *colon = strchr(me->mnt_fsname, ':');
if (colon && strstr(colon, "(pid"))
continue;
}
/* Search for the correct filesystem ops */
fs_ops = ops_search(me->mnt_type);
/*
* Catch everything else with symlinks to
* avoid recursive mounts. This is debatable...
*/
if (!fs_ops)
fs_ops = &amfs_link_ops;
restart_fake_mntfs(me, fs_ops);
}
/*
* Free the mount list
*/
free_mntlist(ml);
}
/*
* Handle an amd restart for amd's own mount points.
*
* Scan through the mount list finding all daemon mount points
* (determined by the presence of a pid inside the mount info).
* Next hack up partial data structures and add the mounted file
* system to the list of known filesystems.
*
* This module relies on internal details of other components. If
* you change something else make *sure* restart() still works.
*/
void
restart_automounter_nodes(void)
{
mntlist *ml, *mlp;
/* reasonably sized list of restarted nfs ports */
u_short old_ports[256];
memset((voidp) &old_ports, 0, sizeof(u_short) * 256);
/*
* Read the existing mount table. For each entry, find nfs, ufs or auto
* mounts and create a partial am_node to represent it.
*/
for (mlp = ml = read_mtab("restart", mnttab_file_name);
mlp;
mlp = mlp->mnext) {
mntent_t *me = mlp->mnt;
am_ops *fs_ops = 0;
char *colon;
long pid;
u_short port;
int err;
if (!STREQ(me->mnt_type, MNTTAB_TYPE_NFS))
continue; /* to next mlp */
/*
* NFS entry, or possibly an Amd entry...
* The mnt_fsname for daemon mount points is
* host:(pidXXX)
* or (seen on Solaris)
* host:daemon(pidXXX)
*/
colon = strchr(me->mnt_fsname, ':');
if (!colon || !strstr(colon, "(pid"))
continue;
/* if got here, then we matched an existing Amd mount point */
err = 1;
plog(XLOG_WARNING, "%s is an existing automount point", me->mnt_dir);
/* Is the old automounter still alive? */
if (sscanf(colon, "%*[^(](pid%ld%*[,)]", &pid) != 1) {
plog(XLOG_WARNING, "Can't parse pid in %s", me->mnt_fsname);
goto give_up;
}
if (kill(pid, 0) != -1 || errno != ESRCH) {
plog(XLOG_WARNING, "Automounter (pid: %ld) still alive", pid);
goto give_up;
}
/*
* Do we have a map for this mount point? Who cares, we'll restart
* anyway -- getting ESTALE is way better than hanging.
*/
/* Can we restart it? Only if it tells us what port it was using... */
if (sscanf(colon, "%*[^,],port%hu)", &port) != 1) {
plog(XLOG_WARNING, "No port specified for %s", me->mnt_fsname);
goto give_up;
}
/* Maybe we already own that port... */
if (port != nfs_port) {
int i;
for (i = 0; i < 256; i++) {
if (old_ports[i] == port ||
old_ports[i] == 0)
break;
}
if (i == 256) {
plog(XLOG_WARNING, "Too many open ports (256)");
goto give_up;
}
if (old_ports[i] == 0) {
int soNFS;
SVCXPRT *nfsxprt;
if (create_nfs_service(&soNFS, &port, &nfsxprt, nfs_program_2) != 0) {
plog(XLOG_WARNING, "Can't bind to port %u", port);
goto give_up;
}
old_ports[i] = nfs_port = port;
}
}
err = 0;
give_up:
if (err) {
plog(XLOG_WARNING, "Can't restart %s, leaving it alone", me->mnt_dir);
fs_ops = &amfs_link_ops;
} else {
fs_ops = &amfs_toplvl_ops;
}
restart_fake_mntfs(me, fs_ops);
} /* end of "for (mlp" */
/* free the mount list */
free_mntlist(ml);
}
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