InfoMagic Source Code 1993 July/THE_SOURCE_CODE_CD_ROM.iso/bsd_srcs/sys/ufs/mfs_vfsops.c

C/C++ Source or Header | 1991-04-15 | 5.3 KB | 197 lines

/*
 * Copyright (c) 1989, 1990 The Regents of the University of California.
 * All rights reserved.
 *
 * 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 acknowledgement:
 *    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.
 *
 *    @(#)mfs_vfsops.c    7.19 (Berkeley) 4/16/91
 */

#include "param.h"
#include "time.h"
#include "kernel.h"
#include "proc.h"
#include "buf.h"
#include "mount.h"
#include "signalvar.h"
#include "vnode.h"

#include "quota.h"
#include "inode.h"
#include "ufsmount.h"
#include "mfsnode.h"
#include "fs.h"

extern struct vnodeops mfs_vnodeops;

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

struct vfsops mfs_vfsops = {
    mfs_mount,
    mfs_start,
    ufs_unmount,
    ufs_root,
    ufs_quotactl,
    mfs_statfs,
    ufs_sync,
    ufs_fhtovp,
    ufs_vptofh,
    mfs_init,
};

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

    if (mp->mnt_flag & MNT_UPDATE) {
        ump = VFSTOUFS(mp);
        fs = ump->um_fs;
        if (fs->fs_ronly && (mp->mnt_flag & MNT_RDONLY) == 0)
            fs->fs_ronly = 0;
        return (0);
    }
    if (error = copyin(data, (caddr_t)&args, sizeof (struct mfs_args)))
        return (error);
    error = getnewvnode(VT_MFS, (struct mount *)0, &mfs_vnodeops, &devvp);
    if (error)
        return (error);
    devvp->v_type = VBLK;
    if (checkalias(devvp, makedev(255, mfs_minor++), (struct mount *)0))
        panic("mfs_mount: dup dev");
    mfsp = VTOMFS(devvp);
    mfsp->mfs_baseoff = args.base;
    mfsp->mfs_size = args.size;
    mfsp->mfs_vnode = devvp;
    mfsp->mfs_pid = p->p_pid;
    mfsp->mfs_buflist = (struct buf *)0;
    if (error = mountfs(devvp, mp)) {
        mfsp->mfs_buflist = (struct buf *)-1;
        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);
    bcopy((caddr_t)fs->fs_fsmnt, (caddr_t)mp->mnt_stat.f_mntonname,
        MNAMELEN);
    (void) copyinstr(args.name, mp->mnt_stat.f_mntfromname, MNAMELEN - 1,
        &size);
    bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
    (void) mfs_statfs(mp, &mp->mnt_stat);
    return (0);
}

int    mfs_pri = PWAIT | PCATCH;        /* XXX prob. temp */

/*
 * 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, p)
    struct mount *mp;
    int flags;
    struct proc *p;
{
    register struct vnode *vp = VFSTOUFS(mp)->um_devvp;
    register struct mfsnode *mfsp = VTOMFS(vp);
    register struct buf *bp;
    register caddr_t base;
    int error = 0;

    base = mfsp->mfs_baseoff;
    while (mfsp->mfs_buflist != (struct buf *)(-1)) {
        while (bp = mfsp->mfs_buflist) {
            mfsp->mfs_buflist = bp->av_forw;
            mfs_doio(bp, base);
            wakeup((caddr_t)bp);
        }
        /*
         * If a non-ignored signal is received, try to unmount.
         * If that fails, clear the signal (it has been "processed"),
         * otherwise we will loop here, as tsleep will always return
         * EINTR/ERESTART.
         */
        if (error = tsleep((caddr_t)vp, mfs_pri, "mfsidl", 0))
            if (dounmount(mp, MNT_NOFORCE, p) != 0)
                CLRSIG(p, CURSIG(p));
    }
    return (error);
}

/*
 * Get file system statistics.
 */
mfs_statfs(mp, sbp, p)
    struct mount *mp;
    struct statfs *sbp;
    struct proc *p;
{
    int error;

    error = ufs_statfs(mp, sbp, p);
    sbp->f_type = MOUNT_MFS;
    return (error);
}