The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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

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    1 /*-
    2  *             Coda: an Experimental Distributed File System
    3  *                              Release 3.1
    4  * 
    5  *           Copyright (c) 1987-1998 Carnegie Mellon University
    6  *                          All Rights Reserved
    7  * 
    8  * Permission  to  use, copy, modify and distribute this software and its
    9  * documentation is hereby granted,  provided  that  both  the  copyright
   10  * notice  and  this  permission  notice  appear  in  all  copies  of the
   11  * software, derivative works or  modified  versions,  and  any  portions
   12  * thereof, and that both notices appear in supporting documentation, and
   13  * that credit is given to Carnegie Mellon University  in  all  documents
   14  * and publicity pertaining to direct or indirect use of this code or its
   15  * derivatives.
   16  * 
   17  * CODA IS AN EXPERIMENTAL SOFTWARE SYSTEM AND IS  KNOWN  TO  HAVE  BUGS,
   18  * SOME  OF  WHICH MAY HAVE SERIOUS CONSEQUENCES.  CARNEGIE MELLON ALLOWS
   19  * FREE USE OF THIS SOFTWARE IN ITS "AS IS" CONDITION.   CARNEGIE  MELLON
   20  * DISCLAIMS  ANY  LIABILITY  OF  ANY  KIND  FOR  ANY  DAMAGES WHATSOEVER
   21  * RESULTING DIRECTLY OR INDIRECTLY FROM THE USE OF THIS SOFTWARE  OR  OF
   22  * ANY DERIVATIVE WORK.
   23  * 
   24  * Carnegie  Mellon  encourages  users  of  this  software  to return any
   25  * improvements or extensions that  they  make,  and  to  grant  Carnegie
   26  * Mellon the rights to redistribute these changes without encumbrance.
   27  * 
   28  *      @(#) src/sys/coda/coda_fbsd.cr,v 1.1.1.1 1998/08/29 21:14:52 rvb Exp $
   29  */
   30 
   31 #include <sys/cdefs.h>
   32 __FBSDID("$FreeBSD$");
   33 
   34 #include "vcoda.h"
   35 
   36 #include <sys/param.h>
   37 #include <sys/systm.h>
   38 #include <sys/conf.h>
   39 #include <sys/fcntl.h>
   40 #include <sys/kernel.h>
   41 #include <sys/lock.h>
   42 #include <sys/malloc.h>
   43 #include <sys/module.h>
   44 #include <sys/ucred.h>
   45 #include <sys/vnode.h>
   46 
   47 #include <vm/vm.h>
   48 #include <vm/vnode_pager.h>
   49 
   50 #include <coda/coda.h>
   51 #include <coda/cnode.h>
   52 #include <coda/coda_vnops.h>
   53 #include <coda/coda_psdev.h>
   54 
   55 /* 
   56    From: "Jordan K. Hubbard" <jkh@time.cdrom.com>
   57    Subject: Re: New 3.0 SNAPshot CDROM about ready for production.. 
   58    To: "Robert.V.Baron" <rvb@GLUCK.CODA.CS.CMU.EDU>
   59    Date: Fri, 20 Feb 1998 15:57:01 -0800
   60 
   61    > Also I need a character device major number. (and might want to reserve
   62    > a block of 10 syscalls.)
   63 
   64    Just one char device number?  No block devices?  Very well, cdev 93 is yours!
   65 */
   66 
   67 #define VC_DEV_NO      93
   68 
   69 static struct cdevsw codadevsw = {
   70         .d_version =    D_VERSION,
   71         .d_flags =      D_NEEDGIANT,
   72         .d_open =       vc_nb_open,
   73         .d_close =      vc_nb_close,
   74         .d_read =       vc_nb_read,
   75         .d_write =      vc_nb_write,
   76         .d_ioctl =      vc_nb_ioctl,
   77         .d_poll =       vc_nb_poll,
   78         .d_name =       "Coda",
   79         .d_maj =        VC_DEV_NO,
   80 };
   81 
   82 int     vcdebug = 1;
   83 #define VCDEBUG if (vcdebug) printf
   84 
   85 static int
   86 codadev_modevent(module_t mod, int type, void *data)
   87 {
   88 
   89         switch (type) {
   90         case MOD_LOAD:
   91                 break;
   92         case MOD_UNLOAD:
   93                 return (EBUSY);
   94         default:
   95                 return (EOPNOTSUPP);
   96         }
   97         return 0;
   98 }
   99 static moduledata_t codadev_mod = {
  100         "codadev",
  101         codadev_modevent,
  102         NULL
  103 };
  104 DECLARE_MODULE(codadev, codadev_mod, SI_SUB_DRIVERS, SI_ORDER_MIDDLE+VC_DEV_NO);
  105 
  106 int
  107 coda_fbsd_getpages(v)
  108         void *v;
  109 {
  110     struct vop_getpages_args *ap = v;
  111 
  112 #if     1
  113         return vop_stdgetpages(ap);
  114 #else
  115   {
  116     struct vnode *vp = ap->a_vp;
  117     struct cnode *cp = VTOC(vp);
  118     struct vnode *cfvp = cp->c_ovp;
  119     int opened_internally = 0;
  120     struct ucred *cred = (struct ucred *) 0;
  121     struct proc *p = curproc;
  122     int error = 0;
  123         
  124     if (IS_CTL_VP(vp)) {
  125         return(EINVAL);
  126     }
  127 
  128     /* Redirect the request to UFS. */
  129 
  130     if (cfvp == NULL) {
  131         opened_internally = 1;
  132 
  133         error = VOP_OPEN(vp, FREAD,  cred, p, -1);
  134 printf("coda_getp: Internally Opening %p\n", vp);
  135 
  136         if (error) {
  137             printf("coda_getpage: VOP_OPEN on container failed %d\n", error);
  138                 return (error);
  139         }
  140         if (vp->v_type == VREG) {
  141             error = vfs_object_create(vp, p, cred);
  142             if (error != 0) {
  143                 printf("coda_getpage: vfs_object_create() returns %d\n", error);
  144                 vput(vp);
  145                 return(error);
  146             }
  147         }
  148 
  149         cfvp = cp->c_ovp;
  150     } else {
  151 printf("coda_getp: has container %p\n", cfvp);
  152     }
  153 
  154 printf("coda_fbsd_getpages: using container ");
  155 /*
  156     error = vnode_pager_generic_getpages(cfvp, ap->a_m, ap->a_count,
  157         ap->a_reqpage);
  158 */
  159     error = VOP_GETPAGES(cfvp, ap->a_m, ap->a_count,
  160         ap->a_reqpage, ap->a_offset);
  161 printf("error = %d\n", error);
  162 
  163     /* Do an internal close if necessary. */
  164     if (opened_internally) {
  165         (void)VOP_CLOSE(vp, FREAD, cred, p);
  166     }
  167 
  168     return(error);
  169   }
  170 #endif
  171 }
  172 
  173 
  174 /* for DEVFS, using bpf & tun drivers as examples*/
  175 static void coda_fbsd_drvinit(void *unused);
  176 static void coda_fbsd_drvuninit(void *unused);
  177 static void coda_fbsd_clone(void *arg, char *name, int namelen, struct cdev **dev);
  178 
  179 static eventhandler_tag clonetag;
  180 
  181 static void coda_fbsd_clone(arg, name, namelen, dev)
  182     void *arg;
  183     char *name;
  184     int namelen;
  185     struct cdev **dev;
  186 {
  187     int u;
  188 
  189     if (*dev != NULL)
  190         return;
  191     if (dev_stdclone(name,NULL,"cfs",&u) != 1)
  192         return;
  193 
  194     *dev = make_dev(&codadevsw,unit2minor(u),UID_ROOT,GID_WHEEL,0600,"cfs%d",u);
  195     coda_mnttbl[unit2minor(u)].dev = *dev;
  196   
  197 }
  198 
  199 static void coda_fbsd_drvinit(unused)
  200     void *unused;
  201 {
  202     int i;
  203 
  204     clonetag = EVENTHANDLER_REGISTER(dev_clone,coda_fbsd_clone,0,1000);
  205     for(i=0;i<NVCODA;i++)
  206         coda_mnttbl[i].dev = NULL; 
  207 }
  208 
  209 static void coda_fbsd_drvuninit(unused)
  210     void *unused;
  211 {
  212     int i;
  213 
  214     EVENTHANDLER_DEREGISTER(dev_clone,clonetag);
  215     for(i=0;i<NVCODA;i++)
  216         if(coda_mnttbl[i].dev)
  217             destroy_dev(coda_mnttbl[i].dev);
  218 }
  219 
  220 SYSINIT(coda_fbsd_dev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+VC_DEV_NO,coda_fbsd_drvinit,NULL);
  221 
  222 SYSUNINIT(coda_fbsd_dev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+VC_DEV_NO,coda_fbsd_drvuninit,NULL);

Cache object: 4f7db5ff4a2dc39f8b203fb14fe24a7a


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