usr/src/sys/ufs/mfs/mfs_vfsops.c

/*
 * Copyright (c) 1989 The Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms are permitted
 * provided that the above copyright notice and this paragraph are
 * duplicated in all such forms and that any documentation,
 * advertising materials, and other materials related to such
 * distribution and use acknowledge that the software was developed
 * by the University of California, Berkeley.  The name of the
 * University may not be used to endorse or promote products derived
 * from this software without specific prior written permission.
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 *
 *      @(#)mfs_vfsops.c        7.2 (Berkeley) %G%
 */

#include "param.h"
#include "buf.h"
#include "mount.h"
#include "time.h"
#include "vnode.h"
#include "../ufs/ufsmount.h"
#include "../ufs/inode.h"
#include "../ufs/fs.h"

extern struct vnodeops mfs_vnodeops;

/*
 * mfs vfs operations.
 */
int mfs_mount();
int mfs_start();
int ufs_unmount();
int ufs_root();
int ufs_statfs();
int ufs_sync();
int ufs_fhtovp();
int ufs_vptofh();

struct vfsops mfs_vfsops = {
        mfs_mount,
        mfs_start,
        ufs_unmount,
        ufs_root,
        ufs_statfs,
        ufs_sync,
        ufs_fhtovp,
        ufs_vptofh,
};

/*
 * VFS Operations.
 *
 * mount system call
 */
mfs_mount(mp, path, data, ndp)
        struct mount *mp;
        char *path;
        caddr_t data;
        struct nameidata *ndp;
{
        struct vnode *devvp;
        struct mfs_args args;
        struct ufsmount *ump;
        register struct fs *fs;
        static int mfs_minor;
        u_int size;
        int error;

        if (error = copyin(data, (caddr_t)&args, sizeof (struct mfs_args)))
                return (error);
        if ((error = bdevvp(NODEV, &devvp)) != 0)
                return (error);
        devvp->v_op = &mfs_vnodeops;
        devvp->v_rdev = makedev(255, mfs_minor++);
        VTOI(devvp)->i_diroff = (long)args.base;
        VTOI(devvp)->i_endoff = args.size;
        error = mountfs(devvp, mp);
        if (error) {
                vrele(devvp);
                return (error);
        }
        ump = VFSTOUFS(mp);
        fs = ump->um_fs;
        (void) copyinstr(path, fs->fs_fsmnt, sizeof(fs->fs_fsmnt) - 1, &size);
        bzero(fs->fs_fsmnt + size, sizeof(fs->fs_fsmnt) - size);
        (void) copyinstr(args.name, ump->um_mntname, MNAMELEN - 1, &size);
        bzero(ump->um_mntname + size, MNAMELEN - size);
        return (0);
}

/*
 * Used to grab the process and keep it in the kernel to service
 * memory filesystem I/O requests.
 *
 * Loop servicing I/O requests.
 * Copy the requested data into or out of the memory filesystem
 * address space.
 */
/* ARGSUSED */
mfs_start(mp, flags)
        struct mount *mp;
        int flags;
{
        register struct vnode *vp = VFSTOUFS(mp)->um_devvp;
        register struct inode *ip = VTOI(vp);
        register struct buf *bp;
        register caddr_t base;

        sleep((caddr_t)vp, PRIBIO);
        base = (caddr_t)ip->i_diroff;
        while (bp = (struct buf *)ip->i_spare[0]) {
                mfs_doio(bp, base);
                wakeup((caddr_t)bp);
                sleep((caddr_t)vp, PRIBIO);
        }
        return (0);
}