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: releng/5.2/sys/coda/coda_fbsd.c 118047 2003-07-26 07:32:23Z phk $");
   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/ucred.h>
   44 #include <sys/vnode.h>
   45 
   46 #include <vm/vm.h>
   47 #include <vm/vnode_pager.h>
   48 
   49 #include <coda/coda.h>
   50 #include <coda/cnode.h>
   51 #include <coda/coda_vnops.h>
   52 #include <coda/coda_psdev.h>
   53 
   54 /* 
   55    From: "Jordan K. Hubbard" <jkh@time.cdrom.com>
   56    Subject: Re: New 3.0 SNAPshot CDROM about ready for production.. 
   57    To: "Robert.V.Baron" <rvb@GLUCK.CODA.CS.CMU.EDU>
   58    Date: Fri, 20 Feb 1998 15:57:01 -0800
   59 
   60    > Also I need a character device major number. (and might want to reserve
   61    > a block of 10 syscalls.)
   62 
   63    Just one char device number?  No block devices?  Very well, cdev 93 is yours!
   64 */
   65 
   66 #define VC_DEV_NO      93
   67 
   68 static struct cdevsw codadevsw = {
   69         .d_open =       vc_nb_open,
   70         .d_close =      vc_nb_close,
   71         .d_read =       vc_nb_read,
   72         .d_write =      vc_nb_write,
   73         .d_ioctl =      vc_nb_ioctl,
   74         .d_poll =       vc_nb_poll,
   75         .d_name =       "Coda",
   76         .d_maj =        VC_DEV_NO,
   77 };
   78 
   79 int     vcdebug = 1;
   80 #define VCDEBUG if (vcdebug) printf
   81 
   82 static int
   83 codadev_modevent(module_t mod, int type, void *data)
   84 {
   85 
   86         switch (type) {
   87         case MOD_LOAD:
   88                 break;
   89         case MOD_UNLOAD:
   90                 break;
   91         default:
   92                 break;
   93         }
   94         return 0;
   95 }
   96 static moduledata_t codadev_mod = {
   97         "codadev",
   98         codadev_modevent,
   99         NULL
  100 };
  101 DECLARE_MODULE(codadev, codadev_mod, SI_SUB_DRIVERS, SI_ORDER_MIDDLE+VC_DEV_NO);
  102 
  103 int
  104 coda_fbsd_getpages(v)
  105         void *v;
  106 {
  107     struct vop_getpages_args *ap = v;
  108 
  109 #if     1
  110         return vop_stdgetpages(ap);
  111 #else
  112   {
  113     struct vnode *vp = ap->a_vp;
  114     struct cnode *cp = VTOC(vp);
  115     struct vnode *cfvp = cp->c_ovp;
  116     int opened_internally = 0;
  117     struct ucred *cred = (struct ucred *) 0;
  118     struct proc *p = curproc;
  119     int error = 0;
  120         
  121     if (IS_CTL_VP(vp)) {
  122         return(EINVAL);
  123     }
  124 
  125     /* Redirect the request to UFS. */
  126 
  127     if (cfvp == NULL) {
  128         opened_internally = 1;
  129 
  130         error = VOP_OPEN(vp, FREAD,  cred, p, -1);
  131 printf("coda_getp: Internally Opening %p\n", vp);
  132 
  133         if (error) {
  134             printf("coda_getpage: VOP_OPEN on container failed %d\n", error);
  135                 return (error);
  136         }
  137         if (vp->v_type == VREG) {
  138             error = vfs_object_create(vp, p, cred);
  139             if (error != 0) {
  140                 printf("coda_getpage: vfs_object_create() returns %d\n", error);
  141                 vput(vp);
  142                 return(error);
  143             }
  144         }
  145 
  146         cfvp = cp->c_ovp;
  147     } else {
  148 printf("coda_getp: has container %p\n", cfvp);
  149     }
  150 
  151 printf("coda_fbsd_getpages: using container ");
  152 /*
  153     error = vnode_pager_generic_getpages(cfvp, ap->a_m, ap->a_count,
  154         ap->a_reqpage);
  155 */
  156     error = VOP_GETPAGES(cfvp, ap->a_m, ap->a_count,
  157         ap->a_reqpage, ap->a_offset);
  158 printf("error = %d\n", error);
  159 
  160     /* Do an internal close if necessary. */
  161     if (opened_internally) {
  162         (void)VOP_CLOSE(vp, FREAD, cred, p);
  163     }
  164 
  165     return(error);
  166   }
  167 #endif
  168 }
  169 
  170 
  171 /* for DEVFS, using bpf & tun drivers as examples*/
  172 static void coda_fbsd_drvinit(void *unused);
  173 static void coda_fbsd_drvuninit(void *unused);
  174 static void coda_fbsd_clone(void *arg, char *name, int namelen, dev_t *dev);
  175 
  176 static eventhandler_tag clonetag;
  177 
  178 static void coda_fbsd_clone(arg, name, namelen, dev)
  179     void *arg;
  180     char *name;
  181     int namelen;
  182     dev_t *dev;
  183 {
  184     int u;
  185 
  186     if (*dev != NODEV)
  187         return;
  188     if (dev_stdclone(name,NULL,"cfs",&u) != 1)
  189         return;
  190 
  191     *dev = make_dev(&codadevsw,unit2minor(u),UID_ROOT,GID_WHEEL,0600,"cfs%d",u);
  192     coda_mnttbl[unit2minor(u)].dev = *dev;
  193   
  194 }
  195 
  196 static void coda_fbsd_drvinit(unused)
  197     void *unused;
  198 {
  199     int i;
  200 
  201     clonetag = EVENTHANDLER_REGISTER(dev_clone,coda_fbsd_clone,0,1000);
  202     for(i=0;i<NVCODA;i++)
  203         coda_mnttbl[i].dev = NULL; 
  204 }
  205 
  206 static void coda_fbsd_drvuninit(unused)
  207     void *unused;
  208 {
  209     int i;
  210 
  211     EVENTHANDLER_DEREGISTER(dev_clone,clonetag);
  212     for(i=0;i<NVCODA;i++)
  213         if(coda_mnttbl[i].dev)
  214             destroy_dev(coda_mnttbl[i].dev);
  215 }
  216 
  217 SYSINIT(coda_fbsd_dev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+VC_DEV_NO,coda_fbsd_drvinit,NULL);
  218 
  219 SYSUNINIT(coda_fbsd_dev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+VC_DEV_NO,coda_fbsd_drvuninit,NULL);

Cache object: c81e66089b5a13d90683ce112b61ebec


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