FreeBSD/Linux Kernel Cross Reference
sys/fs/devfs/devfs_vfsops.c

     /*
      * Copyright (c) 1992, 1993, 1995
      *      The Regents of the University of California.  All rights reserved.
      * Copyright (c) 2000
      *      Poul-Henning Kamp.  All rights reserved.
      *
      * This code is derived from software donated to Berkeley by
      * Jan-Simon Pendry.
      *
     * 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. 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.
     *
     *      @(#)kernfs_vfsops.c     8.10 (Berkeley) 5/14/95
     * From: FreeBSD: src/sys/miscfs/kernfs/kernfs_vfsops.c 1.36
     *
     * $FreeBSD: releng/5.0/sys/fs/devfs/devfs_vfsops.c 107698 2002-12-09 03:44:28Z rwatson $
     */
    
    #include "opt_devfs.h"
    #include "opt_mac.h"
    #ifndef NODEVFS
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/kernel.h>
    #include <sys/lock.h>
    #include <sys/mac.h>
    #include <sys/malloc.h>
    #include <sys/mount.h>
    #include <sys/proc.h>
    #include <sys/vnode.h>
    
    #include <fs/devfs/devfs.h>
    
    MALLOC_DEFINE(M_DEVFS, "DEVFS", "DEVFS data");
    
    static vfs_nmount_t     devfs_nmount;
    static vfs_unmount_t    devfs_unmount;
    static vfs_root_t       devfs_root;
    static vfs_statfs_t     devfs_statfs;
    
    /*
     * Mount the filesystem
     */
    static int
    devfs_nmount(mp, ndp, td)
            struct mount *mp;
            struct nameidata *ndp;
            struct thread *td;
    {
            int error;
            struct devfs_mount *fmp;
            struct vnode *rvp;
    
            error = 0;
            /*
             * XXX: flag changes.
             */
            if (mp->mnt_flag & MNT_UPDATE)
                    return (EOPNOTSUPP);
    
            MALLOC(fmp, struct devfs_mount *, sizeof(struct devfs_mount),
                M_DEVFS, M_WAITOK | M_ZERO);
            MALLOC(fmp->dm_dirent, struct devfs_dirent **,
                sizeof(struct devfs_dirent *) * NDEVFSINO,
                M_DEVFS, M_WAITOK | M_ZERO);
            lockinit(&fmp->dm_lock, PVFS, "devfs", 0, LK_NOPAUSE);
    
            mp->mnt_flag |= MNT_LOCAL;
    #ifdef MAC
            mp->mnt_flag |= MNT_MULTILABEL;
    #endif
            fmp->dm_mount = mp;
            mp->mnt_data = (qaddr_t) fmp;
            vfs_getnewfsid(mp);
    
            fmp->dm_inode = DEVFSINOMOUNT;
    
            fmp->dm_rootdir = devfs_vmkdir("(root)", 6, NULL);
            fmp->dm_rootdir->de_inode = 2;
    #ifdef MAC
           mac_create_devfs_directory(mp, "", 0, fmp->dm_rootdir);
   #endif
           fmp->dm_basedir = fmp->dm_rootdir;
           devfs_rules_newmount(fmp, td);
   
           error = devfs_root(mp, &rvp);
           if (error) {
                   lockdestroy(&fmp->dm_lock);
                   FREE(fmp, M_DEVFS);
                   return (error);
           }
           VOP_UNLOCK(rvp, 0, td);
   
           bzero(mp->mnt_stat.f_mntfromname, MNAMELEN);
           bcopy("devfs", mp->mnt_stat.f_mntfromname, sizeof("devfs"));
           (void)devfs_statfs(mp, &mp->mnt_stat, td);
   
           return (0);
   }
   
   static int
   devfs_unmount(mp, mntflags, td)
           struct mount *mp;
           int mntflags;
           struct thread *td;
   {
           int error;
           int flags = 0;
           struct devfs_mount *fmp;
   
           fmp = VFSTODEVFS(mp);
           if (mntflags & MNT_FORCE)
                   flags |= FORCECLOSE;
           /* There is 1 extra root vnode reference from devfs_mount(). */
           error = vflush(mp, 1, flags);
           if (error)
                   return (error);
           devfs_purge(fmp->dm_rootdir);
           mp->mnt_data = 0;
           lockdestroy(&fmp->dm_lock);
           free(fmp->dm_dirent, M_DEVFS);
           free(fmp, M_DEVFS);
           return 0;
   }
   
   /* Return locked reference to root.  */
   
   static int
   devfs_root(mp, vpp)
           struct mount *mp;
           struct vnode **vpp;
   {
           int error;
           struct thread *td;
           struct vnode *vp;
           struct devfs_mount *dmp;
   
           td = curthread;                                 /* XXX */
           dmp = VFSTODEVFS(mp);
           error = devfs_allocv(dmp->dm_rootdir, mp, &vp, td);
           if (error)
                   return (error);
           vp->v_vflag |= VV_ROOT;
           *vpp = vp;
           return (0);
   }
   
   static int
   devfs_statfs(mp, sbp, td)
           struct mount *mp;
           struct statfs *sbp;
           struct thread *td;
   {
   
           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 = 0;
           sbp->f_ffree = 0;
           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);
   }
   
   static struct vfsops devfs_vfsops = {
           NULL,
           vfs_stdstart,
           devfs_unmount,
           devfs_root,
           vfs_stdquotactl,
           devfs_statfs,
           vfs_stdsync,
           vfs_stdvget,
           vfs_stdfhtovp,
           vfs_stdcheckexp,
           vfs_stdvptofh,
           vfs_stdinit,
           vfs_stduninit,
           vfs_stdextattrctl,
           devfs_nmount,
   };
   
   VFS_SET(devfs_vfsops, devfs, VFCF_SYNTHETIC);
   #endif

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