FreeBSD/Linux Kernel Cross Reference
sys/coda/coda_fbsd.c

     /*
      *             Coda: an Experimental Distributed File System
      *                              Release 3.1
      * 
      *           Copyright (c) 1987-1998 Carnegie Mellon University
      *                          All Rights Reserved
      * 
      * Permission  to  use, copy, modify and distribute this software and its
      * documentation is hereby granted,  provided  that  both  the  copyright
     * notice  and  this  permission  notice  appear  in  all  copies  of the
     * software, derivative works or  modified  versions,  and  any  portions
     * thereof, and that both notices appear in supporting documentation, and
     * that credit is given to Carnegie Mellon University  in  all  documents
     * and publicity pertaining to direct or indirect use of this code or its
     * derivatives.
     * 
     * CODA IS AN EXPERIMENTAL SOFTWARE SYSTEM AND IS  KNOWN  TO  HAVE  BUGS,
     * SOME  OF  WHICH MAY HAVE SERIOUS CONSEQUENCES.  CARNEGIE MELLON ALLOWS
     * FREE USE OF THIS SOFTWARE IN ITS "AS IS" CONDITION.   CARNEGIE  MELLON
     * DISCLAIMS  ANY  LIABILITY  OF  ANY  KIND  FOR  ANY  DAMAGES WHATSOEVER
     * RESULTING DIRECTLY OR INDIRECTLY FROM THE USE OF THIS SOFTWARE  OR  OF
     * ANY DERIVATIVE WORK.
     * 
     * Carnegie  Mellon  encourages  users  of  this  software  to return any
     * improvements or extensions that  they  make,  and  to  grant  Carnegie
     * Mellon the rights to redistribute these changes without encumbrance.
     * 
     *      @(#) src/sys/coda/coda_fbsd.cr,v 1.1.1.1 1998/08/29 21:14:52 rvb Exp $
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD: releng/5.3/sys/coda/coda_fbsd.c 132199 2004-07-15 08:26:07Z phk $");
    
    #include "vcoda.h"
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/conf.h>
    #include <sys/fcntl.h>
    #include <sys/kernel.h>
    #include <sys/lock.h>
    #include <sys/malloc.h>
    #include <sys/module.h>
    #include <sys/ucred.h>
    #include <sys/vnode.h>
    
    #include <vm/vm.h>
    #include <vm/vnode_pager.h>
    
    #include <coda/coda.h>
    #include <coda/cnode.h>
    #include <coda/coda_vnops.h>
    #include <coda/coda_psdev.h>
    
    /* 
       From: "Jordan K. Hubbard" <jkh@time.cdrom.com>
       Subject: Re: New 3.0 SNAPshot CDROM about ready for production.. 
       To: "Robert.V.Baron" <rvb@GLUCK.CODA.CS.CMU.EDU>
       Date: Fri, 20 Feb 1998 15:57:01 -0800
    
       > Also I need a character device major number. (and might want to reserve
       > a block of 10 syscalls.)
    
       Just one char device number?  No block devices?  Very well, cdev 93 is yours!
    */
    
    #define VC_DEV_NO      93
    
    static struct cdevsw codadevsw = {
            .d_version =    D_VERSION,
            .d_flags =      D_NEEDGIANT,
            .d_open =       vc_nb_open,
            .d_close =      vc_nb_close,
            .d_read =       vc_nb_read,
            .d_write =      vc_nb_write,
            .d_ioctl =      vc_nb_ioctl,
            .d_poll =       vc_nb_poll,
            .d_name =       "Coda",
            .d_maj =        VC_DEV_NO,
    };
    
    int     vcdebug = 1;
    #define VCDEBUG if (vcdebug) printf
    
    static int
    codadev_modevent(module_t mod, int type, void *data)
    {
    
            switch (type) {
            case MOD_LOAD:
                    break;
            case MOD_UNLOAD:
                    return (EBUSY);
            default:
                    return (EOPNOTSUPP);
            }
            return 0;
    }
    static moduledata_t codadev_mod = {
           "codadev",
           codadev_modevent,
           NULL
   };
   DECLARE_MODULE(codadev, codadev_mod, SI_SUB_DRIVERS, SI_ORDER_MIDDLE+VC_DEV_NO);
   
   int
   coda_fbsd_getpages(v)
           void *v;
   {
       struct vop_getpages_args *ap = v;
   
   #if     1
           return vop_stdgetpages(ap);
   #else
     {
       struct vnode *vp = ap->a_vp;
       struct cnode *cp = VTOC(vp);
       struct vnode *cfvp = cp->c_ovp;
       int opened_internally = 0;
       struct ucred *cred = (struct ucred *) 0;
       struct proc *p = curproc;
       int error = 0;
           
       if (IS_CTL_VP(vp)) {
           return(EINVAL);
       }
   
       /* Redirect the request to UFS. */
   
       if (cfvp == NULL) {
           opened_internally = 1;
   
           error = VOP_OPEN(vp, FREAD,  cred, p, -1);
   printf("coda_getp: Internally Opening %p\n", vp);
   
           if (error) {
               printf("coda_getpage: VOP_OPEN on container failed %d\n", error);
                   return (error);
           }
           if (vp->v_type == VREG) {
               error = vfs_object_create(vp, p, cred);
               if (error != 0) {
                   printf("coda_getpage: vfs_object_create() returns %d\n", error);
                   vput(vp);
                   return(error);
               }
           }
   
           cfvp = cp->c_ovp;
       } else {
   printf("coda_getp: has container %p\n", cfvp);
       }
   
   printf("coda_fbsd_getpages: using container ");
   /*
       error = vnode_pager_generic_getpages(cfvp, ap->a_m, ap->a_count,
           ap->a_reqpage);
   */
       error = VOP_GETPAGES(cfvp, ap->a_m, ap->a_count,
           ap->a_reqpage, ap->a_offset);
   printf("error = %d\n", error);
   
       /* Do an internal close if necessary. */
       if (opened_internally) {
           (void)VOP_CLOSE(vp, FREAD, cred, p);
       }
   
       return(error);
     }
   #endif
   }
   
   
   /* for DEVFS, using bpf & tun drivers as examples*/
   static void coda_fbsd_drvinit(void *unused);
   static void coda_fbsd_drvuninit(void *unused);
   static void coda_fbsd_clone(void *arg, char *name, int namelen, struct cdev **dev);
   
   static eventhandler_tag clonetag;
   
   static void coda_fbsd_clone(arg, name, namelen, dev)
       void *arg;
       char *name;
       int namelen;
       struct cdev **dev;
   {
       int u;
   
       if (*dev != NULL)
           return;
       if (dev_stdclone(name,NULL,"cfs",&u) != 1)
           return;
   
       *dev = make_dev(&codadevsw,unit2minor(u),UID_ROOT,GID_WHEEL,0600,"cfs%d",u);
       coda_mnttbl[unit2minor(u)].dev = *dev;
     
   }
   
   static void coda_fbsd_drvinit(unused)
       void *unused;
   {
       int i;
   
       clonetag = EVENTHANDLER_REGISTER(dev_clone,coda_fbsd_clone,0,1000);
       for(i=0;i<NVCODA;i++)
           coda_mnttbl[i].dev = NULL; 
   }
   
   static void coda_fbsd_drvuninit(unused)
       void *unused;
   {
       int i;
   
       EVENTHANDLER_DEREGISTER(dev_clone,clonetag);
       for(i=0;i<NVCODA;i++)
           if(coda_mnttbl[i].dev)
               destroy_dev(coda_mnttbl[i].dev);
   }
   
   SYSINIT(coda_fbsd_dev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+VC_DEV_NO,coda_fbsd_drvinit,NULL);
   
   SYSUNINIT(coda_fbsd_dev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+VC_DEV_NO,coda_fbsd_drvuninit,NULL);

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