242 lines
6.0 KiB
C
242 lines
6.0 KiB
C
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/*
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Coda: an Experimental Distributed File System
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Release 3.1
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Copyright (c) 1987-1998 Carnegie Mellon University
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All Rights Reserved
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Permission to use, copy, modify and distribute this software and its
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documentation is hereby granted, provided that both the copyright
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notice and this permission notice appear in all copies of the
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software, derivative works or modified versions, and any portions
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thereof, and that both notices appear in supporting documentation, and
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that credit is given to Carnegie Mellon University in all documents
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and publicity pertaining to direct or indirect use of this code or its
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derivatives.
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CODA IS AN EXPERIMENTAL SOFTWARE SYSTEM AND IS KNOWN TO HAVE BUGS,
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SOME OF WHICH MAY HAVE SERIOUS CONSEQUENCES. CARNEGIE MELLON ALLOWS
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FREE USE OF THIS SOFTWARE IN ITS "AS IS" CONDITION. CARNEGIE MELLON
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DISCLAIMS ANY LIABILITY OF ANY KIND FOR ANY DAMAGES WHATSOEVER
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RESULTING DIRECTLY OR INDIRECTLY FROM THE USE OF THIS SOFTWARE OR OF
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ANY DERIVATIVE WORK.
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Carnegie Mellon encourages users of this software to return any
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improvements or extensions that they make, and to grant Carnegie
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Mellon the rights to redistribute these changes without encumbrance.
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*/
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/* $Header: /afs/cs/project/coda-src/cvs/coda/kernel-src/vfs/freebsd/cfs/cfs_fbsd.c,v 1.6 1998/08/28 18:12:11 rvb Exp $ */
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/proc.h>
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#include <sys/fcntl.h>
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#include <sys/ucred.h>
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#include <sys/malloc.h>
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#include <vm/vm.h>
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#include <vm/vnode_pager.h>
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#ifdef DEVFS
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#include <sys/devfsext.h>
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#endif
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#include <sys/conf.h>
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#include <sys/vnode.h>
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#include <cfs/coda.h>
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#include <cfs/cnode.h>
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#include <cfs/cfs_vnodeops.h>
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/*
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From: "Jordan K. Hubbard" <jkh@time.cdrom.com>
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Subject: Re: New 3.0 SNAPshot CDROM about ready for production..
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To: "Robert.V.Baron" <rvb@GLUCK.CODA.CS.CMU.EDU>
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Date: Fri, 20 Feb 1998 15:57:01 -0800
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> Also I need a character device major number. (and might want to reserve
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> a block of 10 syscalls.)
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Just one char device number? No block devices? Very well, cdev 93 is yours!
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*/
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#define VC_DEV_NO 93
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#ifdef __FreeBSD_version
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/* Type of device methods. */
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extern d_open_t vc_nb_open;
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extern d_close_t vc_nb_close;
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extern d_read_t vc_nb_read;
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extern d_write_t vc_nb_write;
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extern d_ioctl_t vc_nb_ioctl;
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extern d_poll_t vc_nb_poll;
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static struct cdevsw vccdevsw =
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{
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vc_nb_open, vc_nb_close, vc_nb_read, vc_nb_write, /*93*/
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vc_nb_ioctl, nostop, nullreset, nodevtotty,
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vc_nb_poll, nommap, NULL, "Coda", NULL, -1 };
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#else
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/* Type of device methods. */
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#define D_OPEN_T d_open_t
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#define D_CLOSE_T d_close_t
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#define D_RDWR_T d_rdwr_t
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#define D_READ_T d_read_t
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#define D_WRITE_T d_write_t
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#define D_IOCTL_T d_ioctl_t
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#define D_SELECT_T d_select_t
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/* rvb why */
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D_OPEN_T vc_nb_open; /* was is defined in cfs_FreeBSD.h */
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D_CLOSE_T vc_nb_close;
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D_READ_T vc_nb_read;
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D_WRITE_T vc_nb_write;
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D_IOCTL_T vc_nb_ioctl;
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D_SELECT_T vc_nb_select;
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static struct cdevsw vccdevsw =
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{
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vc_nb_open, vc_nb_close, vc_nb_read, vc_nb_write,
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vc_nb_ioctl, nostop, nullreset, nodevtotty,
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vc_nb_select, nommap, NULL, "Coda", NULL, -1 };
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PSEUDO_SET(vcattach, vc);
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#endif
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void vcattach __P((void));
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static dev_t vccdev;
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int vcdebug = 1;
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#define VCDEBUG if (vcdebug) printf
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void
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vcattach(void)
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{
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/*
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* In case we are an LKM, set up device switch.
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*/
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if (0 == (vccdev = makedev(VC_DEV_NO, 0)))
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VCDEBUG("makedev returned null\n");
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else
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VCDEBUG("makedev OK.\n");
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cdevsw_add(&vccdev, &vccdevsw, NULL);
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VCDEBUG("cfs: vccdevsw entry installed at %d.\n", major(vccdev));
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}
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void
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cvref(vp)
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struct vnode *vp;
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{
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if (vp->v_usecount <= 0)
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panic("vref used where vget required");
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vp->v_usecount++;
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}
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#ifdef __FreeBSD_version
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static vc_devsw_installed = 0;
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static void vc_drvinit __P((void *unused));
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static void
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vc_drvinit(void *unused)
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{
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dev_t dev;
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if( ! vc_devsw_installed ) {
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dev = makedev(VC_DEV_NO, 0);
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cdevsw_add(&dev,&vccdevsw, NULL);
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vc_devsw_installed = 1;
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}
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}
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int
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cfs_fbsd_getpages(v)
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void *v;
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{
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struct vop_getpages_args *ap = v;
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struct vnode *vp = ap->a_vp;
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struct cnode *cp = VTOC(vp);
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int ret = 0;
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#if 1
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/*??? a_offset */
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ret = vnode_pager_generic_getpages(ap->a_vp, ap->a_m, ap->a_count,
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ap->a_reqpage);
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return ret;
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#else
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{
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struct vnode *vp = ap->a_vp;
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struct cnode *cp = VTOC(vp);
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struct vnode *cfvp = cp->c_ovp;
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int opened_internally = 0;
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struct ucred *cred = (struct ucred *) 0;
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struct proc *p = curproc;
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int error = 0;
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if (IS_CTL_VP(vp)) {
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return(EINVAL);
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}
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/* Redirect the request to UFS. */
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if (cfvp == NULL) {
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opened_internally = 1;
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error = VOP_OPEN(vp, FREAD, cred, p);
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printf("cfs_getp: Internally Opening %p\n", vp);
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if (error) {
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printf("cfs_getpage: VOP_OPEN on container failed %d\n", error);
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return (error);
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}
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if (vp->v_type == VREG) {
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error = vfs_object_create(vp, p, cred, 1);
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if (error != 0) {
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printf("cfs_getpage: vfs_object_create() returns %d\n", error);
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vput(vp);
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return(error);
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}
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}
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cfvp = cp->c_ovp;
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} else {
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printf("cfs_getp: has container %p\n", cfvp);
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}
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printf("cfs_fbsd_getpages: using container ");
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/*
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error = vnode_pager_generic_getpages(cfvp, ap->a_m, ap->a_count,
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ap->a_reqpage);
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*/
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error = VOP_GETPAGES(cfvp, ap->a_m, ap->a_count,
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ap->a_reqpage, ap->a_offset);
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printf("error = %d\n", error);
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/* Do an internal close if necessary. */
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if (opened_internally) {
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(void)VOP_CLOSE(vp, FREAD, cred, p);
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}
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return(error);
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}
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#endif
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}
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int
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cfs_fbsd_putpages(v)
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void *v;
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{
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struct vop_putpages_args *ap = v;
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/*??? a_offset */
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return vnode_pager_generic_putpages(ap->a_vp, ap->a_m, ap->a_count,
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ap->a_sync, ap->a_rtvals);
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}
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SYSINIT(vccdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+VC_DEV_NO,vc_drvinit,NULL)
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#endif
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