/*
 * Copyright (c) 1990 Jan-Simon Pendry
 * Copyright (c) 1990 Imperial College of Science, Technology & Medicine
 * Copyright (c) 1990, 1993
 *      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.
 */

#include "am.h"

/*
 * 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 will leave a
 * dangling reference to that filesystems, so when the filesystem is
 * finally inherited, an extra "free" must be done on it.
 *
 * This module relies on internal details of other components.  If
 * you change something else make *sure* restart() still works.
 */
void
restart()
{
        /*
         * Read the existing mount table
         */
        mntlist *ml, *mlp;

        /*
         * For each entry, find nfs, ufs or auto mounts
         * and create a partial am_node to represent it.
         */
        for (mlp = ml = read_mtab("restart"); mlp; mlp = mlp->mnext) {
                struct mntent *me = mlp->mnt;
                am_ops *fs_ops = 0;
                if (STREQ(me->mnt_type, "ffs")) {
                        /*
                         * UFS entry
                         */
                        fs_ops = &ufs_ops;
                } else if (STREQ(me->mnt_type, "nfs")) {
                        /*
                         * NFS entry, or possibly an Amd entry...
                         */
                        int au_pid;
                        char *colon = strchr(me->mnt_fsname, ':');
                        if (colon && sscanf(colon, ":(pid%d)", &au_pid) == 1) {
                                plog(XLOG_WARNING, "%s is an existing automount point", me->mnt_dir);
                                fs_ops = &sfs_ops;
                        } else {
                                fs_ops = &nfs_ops;
                        }
                } else if (STREQ(me->mnt_type, "mfs")) {
                        /*
                         * MFS entry.  Fake with a symlink.
                         */
                        fs_ops = &sfs_ops;
                } else {
                        /*
                         * Catch everything else with symlinks to
                         * avoid recursive mounts.  This is debatable...
                         */
                        fs_ops = &sfs_ops;
                }

                /*
                 * If we found something to do
                 */
                if (fs_ops) {
                        mntfs *mf;
                        am_opts mo;
                        char *cp;
                        cp = strchr(me->mnt_fsname, ':');
                        /*
                         * Partially fake up an opts structure
                         */
                        mo.opt_rhost = 0;
                        mo.opt_rfs = 0;
                        if (cp) {
                                *cp = '\0';
                                mo.opt_rhost = strdup(me->mnt_fsname);
                                mo.opt_rfs = strdup(cp+1);
                                *cp = ':';
                        } else if (fs_ops->ffserver == find_nfs_srvr) {
                                /*
                                 * Prototype 4.4 BSD used to end up here -
                                 * might as well keep the workaround for now
                                 */
                                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;
                                /*
                                 * If the restarted type is a link then
                                 * don't time out.
                                 */
                                if (fs_ops == &sfs_ops || fs_ops == &ufs_ops)
                                        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",
                                        me->mnt_fsname, fs_ops->fs_type, me->mnt_dir);
                        } else {
                                /* Something strange happened - two mounts at the same place! */
                                free_mntfs(mf);
                        }
                        /*
                         * Clean up mo
                         */
                        free(mo.opt_rhost);
                        free(mo.opt_rfs);
                }
        }

        /*
         * Free the mount list
         */
        free_mntlist(ml);
}