usr/src/sys/miscfs/portal/portal_vfsops.c

/*
 * Copyright (c) 1992, 1993, 1995
 *      The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software donated to Berkeley by
 * Jan-Simon Pendry.
 *
 * %sccs.include.redist.c%
 *
 *      @(#)portal_vfsops.c     8.11 (Berkeley) %G%
 *
 * $Id: portal_vfsops.c,v 1.5 1992/05/30 10:25:27 jsp Exp jsp $
 */

/*
 * Portal Filesystem
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/proc.h>
#include <sys/filedesc.h>
#include <sys/file.h>
#include <sys/vnode.h>
#include <sys/mount.h>
#include <sys/namei.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/protosw.h>
#include <sys/domain.h>
#include <sys/un.h>
#include <miscfs/portal/portal.h>

int
portal_init(vfsp)
        struct vfsconf *vfsp;
{

        return (0);
}

/*
 * Mount the per-process file descriptors (/dev/fd)
 */
int
portal_mount(mp, path, data, ndp, p)
        struct mount *mp;
        char *path;
        caddr_t data;
        struct nameidata *ndp;
        struct proc *p;
{
        struct file *fp;
        struct portal_args args;
        struct portalmount *fmp;
        struct socket *so;
        struct vnode *rvp;
        u_int size;
        int error;

        /*
         * Update is a no-op
         */
        if (mp->mnt_flag & MNT_UPDATE)
                return (EOPNOTSUPP);

        if (error = copyin(data, (caddr_t) &args, sizeof(struct portal_args)))
                return (error);

        if (error = getsock(p->p_fd, args.pa_socket, &fp))
                return (error);
        so = (struct socket *) fp->f_data;
        if (so->so_proto->pr_domain->dom_family != AF_UNIX)
                return (ESOCKTNOSUPPORT);

        error = getnewvnode(VT_PORTAL, mp, portal_vnodeop_p, &rvp); /* XXX */
        if (error)
                return (error);
        MALLOC(rvp->v_data, void *, sizeof(struct portalnode),
                M_TEMP, M_WAITOK);

        fmp = (struct portalmount *) malloc(sizeof(struct portalmount),
                                 M_UFSMNT, M_WAITOK);   /* XXX */
        rvp->v_type = VDIR;
        rvp->v_flag |= VROOT;
        VTOPORTAL(rvp)->pt_arg = 0;
        VTOPORTAL(rvp)->pt_size = 0;
        VTOPORTAL(rvp)->pt_fileid = PORTAL_ROOTFILEID;
        fmp->pm_root = rvp;
        fmp->pm_server = fp; fp->f_count++;

        mp->mnt_flag |= MNT_LOCAL;
        mp->mnt_data = (qaddr_t) fmp;
        vfs_getnewfsid(mp);

        (void)copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN - 1, &size);
        bzero(mp->mnt_stat.f_mntonname + size, MNAMELEN - size);
        (void)copyinstr(args.pa_config,
            mp->mnt_stat.f_mntfromname, MNAMELEN - 1, &size);
        bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);

#ifdef notdef
        bzero(mp->mnt_stat.f_mntfromname, MNAMELEN);
        bcopy("portal", mp->mnt_stat.f_mntfromname, sizeof("portal"));
#endif

        return (0);
}

int
portal_start(mp, flags, p)
        struct mount *mp;
        int flags;
        struct proc *p;
{

        return (0);
}

int
portal_unmount(mp, mntflags, p)
        struct mount *mp;
        int mntflags;
        struct proc *p;
{
        struct vnode *rootvp = VFSTOPORTAL(mp)->pm_root;
        int error, flags = 0;


        if (mntflags & MNT_FORCE)
                flags |= FORCECLOSE;

        /*
         * Clear out buffer cache.  I don't think we
         * ever get anything cached at this level at the
         * moment, but who knows...
         */
#ifdef notyet
        mntflushbuf(mp, 0);
        if (mntinvalbuf(mp, 1))
                return (EBUSY);
#endif
        if (rootvp->v_usecount > 1)
                return (EBUSY);
        if (error = vflush(mp, rootvp, flags))
                return (error);

        /*
         * Release reference on underlying root vnode
         */
        vrele(rootvp);
        /*
         * And blow it away for future re-use
         */
        vgone(rootvp);
        /*
         * Shutdown the socket.  This will cause the select in the
         * daemon to wake up, and then the accept will get ECONNABORTED
         * which it interprets as a request to go and bury itself.
         */
        soshutdown((struct socket *) VFSTOPORTAL(mp)->pm_server->f_data, 2);
        /*
         * Discard reference to underlying file.  Must call closef because
         * this may be the last reference.
         */
        closef(VFSTOPORTAL(mp)->pm_server, (struct proc *) 0);
        /*
         * Finally, throw away the portalmount structure
         */
        free(mp->mnt_data, M_UFSMNT);   /* XXX */
        mp->mnt_data = 0;
        return (0);
}

int
portal_root(mp, vpp)
        struct mount *mp;
        struct vnode **vpp;
{
        struct proc *p = curproc;       /* XXX */
        struct vnode *vp;

        /*
         * Return locked reference to root.
         */
        vp = VFSTOPORTAL(mp)->pm_root;
        VREF(vp);
        vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p);
        *vpp = vp;
        return (0);
}

int
portal_statfs(mp, sbp, p)
        struct mount *mp;
        struct statfs *sbp;
        struct proc *p;
{

        sbp->f_flags = 0;
        sbp->f_bsize = DEV_BSIZE;
        sbp->f_iosize = DEV_BSIZE;
        sbp->f_blocks = 2;              /* 1K to keep df happy */
        sbp->f_bfree = 0;
        sbp->f_bavail = 0;
        sbp->f_files = 1;               /* Allow for "." */
        sbp->f_ffree = 0;               /* See comments above */
        if (sbp != &mp->mnt_stat) {
                sbp->f_type = mp->mnt_vfc->vfc_typenum;
                bcopy(&mp->mnt_stat.f_fsid, &sbp->f_fsid, sizeof(sbp->f_fsid));
                bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN);
                bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN);
        }
        return (0);
}

#define portal_fhtovp ((int (*) __P((struct mount *, struct fid *, \
            struct mbuf *, struct vnode **, int *, struct ucred **)))eopnotsupp)
#define portal_quotactl ((int (*) __P((struct mount *, int, uid_t, caddr_t, \
            struct proc *)))eopnotsupp)
#define portal_sync ((int (*) __P((struct mount *, int, struct ucred *, \
            struct proc *)))nullop)
#define portal_sysctl ((int (*) __P((int *, u_int, void *, size_t *, void *, \
            size_t, struct proc *)))eopnotsupp)
#define portal_vget ((int (*) __P((struct mount *, ino_t, struct vnode **))) \
            eopnotsupp)
#define portal_vptofh ((int (*) __P((struct vnode *, struct fid *)))eopnotsupp)

struct vfsops portal_vfsops = {
        portal_mount,
        portal_start,
        portal_unmount,
        portal_root,
        portal_quotactl,
        portal_statfs,
        portal_sync,
        portal_vget,
        portal_fhtovp,
        portal_vptofh,
        portal_init,
        portal_sysctl,
};