usr/src/usr.sbin/amd/amd/mount_fs.c

/*
 * $Id: mount_fs.c,v 5.2 90/06/23 22:19:42 jsp Rel $
 *
 * 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.
 *
 * %sccs.include.redist.c%
 *
 *      @(#)mount_fs.c  5.1 (Berkeley) %G%
 */

#include "am.h"
#ifdef NFS_3
typedef nfs_fh fhandle_t;
#endif /* NFS_3 */
#include <sys/mount.h>

/*
 * System Vr4 / SunOS 4.1 compatibility
 * - put dev= in the options list
 *
 * From: Brent Callaghan <brent@eng.sun.com>
 */
#define MNTINFO_DEV     "dev"
#include <sys/stat.h>

/*
 * Standard mount flags
 */
#ifdef hpux
/*
 * HP-UX has an annoying feature of printing
 * error msgs on /dev/console
 */
#undef M_NOSUID
#endif /* hpux */

struct opt_tab mnt_flags[] = {
        { "ro", M_RDONLY },
#ifdef M_CACHE
        { "nocache", M_NOCACHE },
#endif /* M_CACHE */
#ifdef M_GRPID
        { "grpid", M_GRPID },
#endif /* M_GRPID */
#ifdef M_MULTI
        { "multi", M_MULTI },
#endif /* M_MULTI */
#ifdef M_NODEV
        { "nodev", M_NODEV },
#endif /* M_NODEV */
#ifdef M_NOEXEC
        { "noexec", M_NOEXEC },
#endif /* M_NOEXEC */
#ifdef M_NOSUB
        { "nosub", M_NOSUB },
#endif /* M_NOSUB */
#ifdef M_NOSUID
        { "nosuid", M_NOSUID },
#endif /* M_NOSUID */
#ifdef M_SYNC
        { "sync", M_SYNC },
#endif /* M_SYNC */
        { 0, 0 }
};

int compute_mount_flags(mnt)
struct mntent *mnt;
{
        struct opt_tab *opt;
        int flags;
#ifdef NFS_4
        flags = M_NEWTYPE;
#else
        flags = 0;
#endif /* NFS_4 */

        /*
         * Crack basic mount options
         */
        for (opt = mnt_flags; opt->opt; opt++)
                flags |= hasmntopt(mnt, opt->opt) ? opt->flag : 0;

        return flags;
}

int mount_fs(mnt, flags, mnt_data, retry, type)
struct mntent *mnt;
int flags;
caddr_t mnt_data;
int retry;
MTYPE_TYPE type;
{
        int error = 0;
        int automount = 0;
#ifdef MNTINFO_DEV
        struct stat stb;
        char *xopts = 0;
#endif /* MNTINFO_DEV */

#ifdef DEBUG
#ifdef NFS_4
        dlog("%s fstype %s (%s) flags %#x (%s)",
                mnt->mnt_dir, type, mnt->mnt_type, flags, mnt->mnt_opts);
#else
        dlog("%s fstype %d (%s) flags %#x (%s)",
                mnt->mnt_dir, type, mnt->mnt_type, flags, mnt->mnt_opts);
#endif /* NFS_4 */
#endif /* DEBUG */

        /*
         * Fake some mount table entries for the automounter
         */
        if (STREQ(mnt->mnt_type, MNTTYPE_AUTO)) {
                automount = 1;
                mnt->mnt_fsname = pid_fsname;
                /*
                 * Try it with the normal name
                 */
#ifdef notdef
                /*
                 * This is notdef'ed because some systems use
                 * the mount table in getwd() (esp. SunOS4) and
                 * if all the mount points are not marked it can
                 * cause major confusion.  This can probably
                 * be changed when no-one is running SunOS 4.0
                 * any more.
                 */
                mnt->mnt_type = MNTTYPE_IGNORE;
#endif /* notdef */
                mnt->mnt_type = MNTTYPE_NFS;
                /*
                 * Background the mount, so that the stat of the
                 * mountpoint is done in a background process.
                 */
                if (background())
                        return 0;
        }

again:
        clock_valid = 0;
        error = MOUNT_TRAP(type, mnt, flags, mnt_data);
        if (error < 0)
                plog(XLOG_ERROR, "%s: mount: %m", mnt->mnt_dir);
        if (error < 0 && --retry > 0) {
                sleep(1);
                goto again;
        }
        if (error < 0) {
                if (automount)
                        going_down(errno);
                return errno;
        }

#ifdef UPDATE_MTAB
#ifdef MNTINFO_DEV
        /*
         * Add the extra dev= field to the mount table.
         */
        if (lstat(mnt->mnt_dir, &stb) == 0) {
                char *zopts = (char *) xmalloc(strlen(mnt->mnt_opts) + 32);
                xopts = mnt->mnt_opts;
                if (sizeof(stb.st_dev) == 2) {
                        /* SunOS 4.1 */
                        sprintf(zopts, "%s,%s=%04lx", xopts, MNTINFO_DEV,
                                        (u_long) stb.st_dev & 0xffff);
                } else {
                        /* System Vr4 */
                        sprintf(zopts, "%s,%s=%08lx", xopts, MNTINFO_DEV,
                                        (u_long) stb.st_dev);
                }
                mnt->mnt_opts = zopts;
        }
#endif /* MNTINFO_DEV */

#ifdef hpux
        /*
         * Yet another gratuitously incompatible change in HP-UX
         */
        mnt->mnt_time = clocktime();
#endif /* hpux */
        write_mntent(mnt);
#ifdef MNTINFO_DEV
        if (xopts) {
                free(mnt->mnt_opts);
                mnt->mnt_opts = xopts;
        }
#endif /* MNTINFO_DEV */
#endif /* UPDATE_MTAB */

        /*
         * Needed this way since mnt may contain a pointer
         * to a local variable in this stack frame.
         */
        if (automount)
                going_down(0);
        return 0;
}

#ifdef NEED_MNTOPT_PARSER
/*
 * Some systems don't provide these to the user,
 * but amd needs them, so...
 *
 * From: Piete Brooks <pb@cl.cam.ac.uk>
 */

#include <ctype.h>

static char *nextmntopt(p)
char **p;
{
        char *cp = *p;
        char *rp;
        /*
         * Skip past white space
         */
        while (*cp && isspace(*cp))
                cp++;
        /*
         * Word starts here
         */
        rp = cp;
        /*
         * Scan to send of string or separator
         */
        while (*cp && *cp != ',')
                cp++;
        /*
         * If separator found the overwrite with nul char.
         */
        if (*cp) {
                *cp = '\0';
                cp++;
        }
        /*
         * Return value for next call
         */
        *p = cp;
        return rp;
}

char *hasmntopt(mnt, opt)
struct mntent *mnt;
char *opt;
{
        char t[MNTMAXSTR];
        char *f;
        char *o = t;
        int l = strlen(opt);
        strcpy(t, mnt->mnt_opts);

        while (*(f = nextmntopt(&o)))
                if (strncmp(opt, f, l) == 0)
                        return f - t + mnt->mnt_opts;

        return 0;
}
#endif /* NEED_MNTOPT_PARSER */

#ifdef MOUNT_AIX3

#include "aix3-nfs.h"

static int aix3_mkvp(p, gfstype, flags, object, stub, host, info, info_size, args)
char *p;
int gfstype;
int flags;
char *object;
char *stub;
char *host;
char *info;
int info_size;
char *args;
{
        struct vmount *vp = (struct vmount *) p;
        bzero((voidp) vp, sizeof(*vp));
        /*
         * Fill in standard fields
         */
        vp->vmt_revision = VMT_REVISION;
        vp->vmt_flags = flags;
        vp->vmt_gfstype = gfstype;

#define VMT_ROUNDUP(len) (4 * ((len + 3) / 4))
#define VMT_ASSIGN(vp, idx, data, size) \
        vp->vmt_data[idx].vmt_off = p - (char *) vp; \
        vp->vmt_data[idx].vmt_size = size; \
        bcopy(data, p, size); \
        p += VMT_ROUNDUP(size);

        /*
         * Fill in all variable length data
         */
        p += sizeof(*vp);

        VMT_ASSIGN(vp, VMT_OBJECT, object, strlen(object) + 1);
        VMT_ASSIGN(vp, VMT_STUB, stub, strlen(stub) + 1);
        VMT_ASSIGN(vp, VMT_HOST, host, strlen(host) + 1);
        VMT_ASSIGN(vp, VMT_HOSTNAME, host, strlen(host) + 1);
        VMT_ASSIGN(vp, VMT_INFO, info, info_size);
        VMT_ASSIGN(vp, VMT_ARGS, args, strlen(args) + 1);

#undef VMT_ASSIGN
#undef VMT_ROUNDUP

        /*
         * Return length
         */
        return vp->vmt_length = p - (char *) vp;
}

/*
 * Map from conventional mount arguments
 * to AIX 3-style arguments.
 */
aix3_mount(fsname, dir, flags, type, data, args)
char *fsname;
char *dir;
int flags;
int type;
void *data;
char *args;
{
        char buf[4096];
        int size;

#ifdef DEBUG
        dlog("aix3_mount: fsname %s, dir %s, type %d", fsname, dir, type);
#endif /* DEBUG */

/* aix3_mkvp(p, gfstype, flags, object, stub, host, info, info_size, args) */

        switch (type) {

        case MOUNT_TYPE_NFS: {
                char *host = strdup(fsname);
                char *rfs = strchr(host, ':');
                *rfs++ = '\0';

                size = aix3_mkvp(buf, type, flags, rfs, dir, host, data, sizeof(struct nfs_args), args);
                free(host);

                } break;

        case MOUNT_TYPE_UFS:
                /* Need to open block device and extract log device info from sblk. */
                return EINVAL;

        default:
                return EINVAL;
        }
#ifdef DEBUG
        /*dlog("aix3_mkvp: flags %#x, size %d, args %s", flags, size, args);*/
#endif /* DEBUG */

        return vmount(buf, size);
}
#endif /* MOUNT_AIX3 */