1130b656e5
This will make a number of things easier in the future, as well as (finally!) avoiding the Id-smashing problem which has plagued developers for so long. Boy, I'm glad we're not using sup anymore. This update would have been insane otherwise.
652 lines
16 KiB
C
652 lines
16 KiB
C
/*
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* Copyright (c) 1988 University of Utah.
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* Copyright (c) 1990, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* the Systems Programming Group of the University of Utah Computer
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* Science Department.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* from: Utah Hdr: vn.c 1.13 94/04/02
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*
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* from: @(#)vn.c 8.6 (Berkeley) 4/1/94
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* $FreeBSD$
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*/
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/*
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* Vnode disk driver.
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*
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* Block/character interface to a vnode. Allows one to treat a file
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* as a disk (e.g. build a filesystem in it, mount it, etc.).
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*
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* NOTE 1: This uses the VOP_BMAP/VOP_STRATEGY interface to the vnode
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* instead of a simple VOP_RDWR. We do this to avoid distorting the
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* local buffer cache.
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*
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* NOTE 2: There is a security issue involved with this driver.
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* Once mounted all access to the contents of the "mapped" file via
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* the special file is controlled by the permissions on the special
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* file, the protection of the mapped file is ignored (effectively,
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* by using root credentials in all transactions).
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*
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* NOTE 3: Doesn't interact with leases, should it?
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*/
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#include "vn.h"
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#if NVN > 0
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/* default is to have 8 VN's */
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#if NVN < 8
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#undef NVN
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#define NVN 8
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#endif
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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/namei.h>
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#include <sys/proc.h>
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#include <sys/errno.h>
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#include <sys/buf.h>
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#include <sys/malloc.h>
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#include <sys/ioctl.h>
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#include <sys/mount.h>
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#include <sys/vnode.h>
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#include <sys/file.h>
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#include <sys/uio.h>
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#include <sys/disklabel.h>
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#include <sys/diskslice.h>
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#include <sys/stat.h>
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#include <sys/conf.h>
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#ifdef DEVFS
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#include <sys/devfsext.h>
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#endif /*DEVFS*/
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#include <miscfs/specfs/specdev.h>
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#include <sys/vnioctl.h>
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static d_open_t vnopen;
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static d_close_t vnclose;
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static d_ioctl_t vnioctl;
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static d_dump_t vndump;
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static d_psize_t vnsize;
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static d_strategy_t vnstrategy;
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#define CDEV_MAJOR 43
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#define BDEV_MAJOR 15
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static struct cdevsw vn_cdevsw;
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static struct bdevsw vn_bdevsw =
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{ vnopen, vnclose, vnstrategy, vnioctl, /*15*/
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vndump, vnsize, 0, "vn", &vn_cdevsw, -1 };
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#ifdef DEBUG
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int dovncluster = 1;
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int vndebug = 0x00;
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#define VDB_FOLLOW 0x01
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#define VDB_INIT 0x02
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#define VDB_IO 0x04
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#endif
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#define vnunit(dev) dkunit(dev)
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#define getvnbuf() \
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((struct buf *)malloc(sizeof(struct buf), M_DEVBUF, M_WAITOK))
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#define putvnbuf(bp) \
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free((caddr_t)(bp), M_DEVBUF)
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struct vn_softc {
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int sc_flags; /* flags */
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size_t sc_size; /* size of vn */
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#if defined(DEVFS) && defined(notyet)
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void *sc_bdev; /* devfs token for whole disk */
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void *sc_cdev; /* devfs token for raw whole disk */
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#endif
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struct vnode *sc_vp; /* vnode */
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struct ucred *sc_cred; /* credentials */
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int sc_maxactive; /* max # of active requests */
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struct buf sc_tab; /* transfer queue */
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u_long sc_options; /* options */
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struct diskslices *sc_slices;
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};
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/* sc_flags */
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#define VNF_INITED 0x01
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static struct vn_softc *vn_softc[NVN];
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static u_long vn_options;
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#define IFOPT(vn,opt) if (((vn)->sc_options|vn_options) & (opt))
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static void vniodone (struct buf *bp);
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static int vnsetcred (struct vn_softc *vn, struct ucred *cred);
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static void vnshutdown (int, void *);
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static void vnclear (struct vn_softc *vn);
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static int
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vnclose(dev_t dev, int flags, int mode, struct proc *p)
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{
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struct vn_softc *vn = vn_softc[vnunit(dev)];
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IFOPT(vn, VN_LABELS)
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if (vn->sc_slices != NULL)
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dsclose(dev, mode, vn->sc_slices);
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return (0);
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}
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static int
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vnopen(dev_t dev, int flags, int mode, struct proc *p)
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{
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int unit = vnunit(dev);
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struct vn_softc *vn;
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if (unit >= NVN) {
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if (vn_options & VN_FOLLOW)
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printf("vnopen(0x%lx, 0x%x, 0x%x, %p)\n",
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dev, flags, mode, p);
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return(ENOENT);
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}
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vn = vn_softc[unit];
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if (!vn) {
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vn = malloc(sizeof *vn, M_DEVBUF, M_WAITOK);
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if (!vn)
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return (ENOMEM);
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bzero(vn, sizeof *vn);
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vn_softc[unit] = vn;
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}
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IFOPT(vn, VN_FOLLOW)
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printf("vnopen(0x%lx, 0x%x, 0x%x, %p)\n", dev, flags, mode, p);
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IFOPT(vn, VN_LABELS) {
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if (vn->sc_flags & VNF_INITED) {
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struct disklabel label;
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/* Build label for whole disk. */
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bzero(&label, sizeof label);
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label.d_secsize = DEV_BSIZE;
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label.d_nsectors = 32;
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label.d_ntracks = 64;
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label.d_ncylinders = vn->sc_size / (32 * 64);
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label.d_secpercyl = 32 * 64;
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label.d_secperunit =
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label.d_partitions[RAW_PART].p_size =
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vn->sc_size;
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return (dsopen("vn", dev, mode, &vn->sc_slices, &label,
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vnstrategy, (ds_setgeom_t *)NULL,
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&vn_bdevsw, &vn_cdevsw));
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}
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if (dkslice(dev) != WHOLE_DISK_SLICE ||
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dkpart(dev) != RAW_PART ||
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mode != S_IFCHR)
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return (ENXIO);
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}
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return(0);
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}
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/*
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* this code does I/O calls through the appropriate VOP entry point...
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* unless a swap_pager I/O request is being done. This strategy (-))
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* allows for coherency with mmap except in the case of paging. This
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* is necessary, because the VOP calls use lots of memory (and actually
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* are not extremely efficient -- but we want to keep semantics correct),
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* and the pageout daemon gets really unhappy (and so does the rest of the
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* system) when it runs out of memory.
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*/
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static void
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vnstrategy(struct buf *bp)
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{
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int unit = vnunit(bp->b_dev);
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register struct vn_softc *vn = vn_softc[unit];
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register daddr_t bn;
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int error;
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long sz;
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struct uio auio;
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struct iovec aiov;
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IFOPT(vn, VN_DEBUG)
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printf("vnstrategy(%p): unit %d\n", bp, unit);
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if ((vn->sc_flags & VNF_INITED) == 0) {
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bp->b_error = ENXIO;
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bp->b_flags |= B_ERROR;
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biodone(bp);
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return;
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}
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IFOPT(vn, VN_LABELS) {
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bp->b_resid = bp->b_bcount;/* XXX best place to set this? */
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if (vn->sc_slices != NULL && dscheck(bp, vn->sc_slices) <= 0) {
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biodone(bp);
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return;
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}
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bn = bp->b_pblkno;
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bp->b_resid = bp->b_bcount;/* XXX best place to set this? */
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} else {
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bn = bp->b_blkno;
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sz = howmany(bp->b_bcount, DEV_BSIZE);
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bp->b_resid = bp->b_bcount;
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if (bn < 0 || bn + sz > vn->sc_size) {
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if (bn != vn->sc_size) {
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bp->b_error = EINVAL;
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bp->b_flags |= B_ERROR;
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}
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biodone(bp);
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return;
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}
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}
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if( (bp->b_flags & B_PAGING) == 0) {
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aiov.iov_base = bp->b_data;
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aiov.iov_len = bp->b_bcount;
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auio.uio_iov = &aiov;
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auio.uio_iovcnt = 1;
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auio.uio_offset = dbtob(bn);
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auio.uio_segflg = UIO_SYSSPACE;
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if( bp->b_flags & B_READ)
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auio.uio_rw = UIO_READ;
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else
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auio.uio_rw = UIO_WRITE;
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auio.uio_resid = bp->b_bcount;
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auio.uio_procp = curproc;
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if( bp->b_flags & B_READ)
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error = VOP_READ(vn->sc_vp, &auio, 0, vn->sc_cred);
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else
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error = VOP_WRITE(vn->sc_vp, &auio, 0, vn->sc_cred);
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bp->b_resid = auio.uio_resid;
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if( error )
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bp->b_flags |= B_ERROR;
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biodone(bp);
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} else {
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long bsize, resid;
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off_t byten;
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int flags;
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caddr_t addr;
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struct buf *nbp;
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nbp = getvnbuf();
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byten = dbtob(bn);
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bsize = vn->sc_vp->v_mount->mnt_stat.f_iosize;
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addr = bp->b_data;
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flags = bp->b_flags | B_CALL;
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for (resid = bp->b_resid; resid; ) {
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struct vnode *vp;
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daddr_t nbn;
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int off, s, nra;
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nra = 0;
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error = VOP_BMAP(vn->sc_vp, (daddr_t)(byten / bsize),
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&vp, &nbn, &nra, NULL);
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if (error == 0 && nbn == -1)
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error = EIO;
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IFOPT(vn, VN_DONTCLUSTER)
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nra = 0;
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off = byten % bsize;
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if (off)
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sz = bsize - off;
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else
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sz = (1 + nra) * bsize;
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if (resid < sz)
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sz = resid;
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if (error) {
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bp->b_resid -= (resid - sz);
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bp->b_flags |= B_ERROR;
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biodone(bp);
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putvnbuf(nbp);
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return;
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}
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IFOPT(vn,VN_IO)
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printf(
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/* XXX no %qx in kernel. Synthesize it. */
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"vnstrategy: vp %p/%p bn 0x%lx%08lx/0x%lx sz 0x%x\n",
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vn->sc_vp, vp, (long)(byten >> 32),
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(u_long)byten, nbn, sz);
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nbp->b_flags = flags;
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nbp->b_bcount = sz;
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nbp->b_bufsize = sz;
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nbp->b_error = 0;
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if (vp->v_type == VBLK || vp->v_type == VCHR)
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nbp->b_dev = vp->v_rdev;
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else
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nbp->b_dev = NODEV;
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nbp->b_data = addr;
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nbp->b_blkno = nbn + btodb(off);
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nbp->b_proc = bp->b_proc;
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nbp->b_iodone = vniodone;
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nbp->b_vp = vp;
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nbp->b_rcred = vn->sc_cred; /* XXX crdup? */
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nbp->b_wcred = vn->sc_cred; /* XXX crdup? */
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nbp->b_dirtyoff = bp->b_dirtyoff;
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nbp->b_dirtyend = bp->b_dirtyend;
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nbp->b_validoff = bp->b_validoff;
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nbp->b_validend = bp->b_validend;
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if ((nbp->b_flags & B_READ) == 0)
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nbp->b_vp->v_numoutput++;
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VOP_STRATEGY(nbp);
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s = splbio();
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while ((nbp->b_flags & B_DONE) == 0) {
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nbp->b_flags |= B_WANTED;
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tsleep(nbp, PRIBIO, "vnwait", 0);
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}
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splx(s);
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if( nbp->b_flags & B_ERROR) {
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bp->b_flags |= B_ERROR;
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bp->b_resid -= (resid - sz);
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biodone(bp);
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putvnbuf(nbp);
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return;
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}
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byten += sz;
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addr += sz;
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resid -= sz;
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}
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biodone(bp);
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putvnbuf(nbp);
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}
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}
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void
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vniodone( struct buf *bp) {
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bp->b_flags |= B_DONE;
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wakeup((caddr_t) bp);
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}
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/* ARGSUSED */
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static int
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vnioctl(dev_t dev, int cmd, caddr_t data, int flag, struct proc *p)
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{
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struct vn_softc *vn = vn_softc[vnunit(dev)];
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struct vn_ioctl *vio;
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struct vattr vattr;
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struct nameidata nd;
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int error;
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u_long *f;
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IFOPT(vn,VN_FOLLOW)
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printf("vnioctl(0x%lx, 0x%x, %p, 0x%x, %p): unit %d\n",
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dev, cmd, data, flag, p, vnunit(dev));
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switch (cmd) {
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case VNIOCATTACH:
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case VNIOCDETACH:
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case VNIOCGSET:
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case VNIOCGCLEAR:
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case VNIOCUSET:
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case VNIOCUCLEAR:
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goto vn_specific;
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}
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IFOPT(vn,VN_LABELS) {
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if (vn->sc_slices != NULL) {
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error = dsioctl("vn", dev, cmd, data, flag,
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&vn->sc_slices, vnstrategy,
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(ds_setgeom_t *)NULL);
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if (error != -1)
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return (error);
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}
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if (dkslice(dev) != WHOLE_DISK_SLICE ||
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dkpart(dev) != RAW_PART)
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return (ENOTTY);
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}
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vn_specific:
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error = suser(p->p_ucred, &p->p_acflag);
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if (error)
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return (error);
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vio = (struct vn_ioctl *)data;
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f = (u_long*)data;
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switch (cmd) {
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case VNIOCATTACH:
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if (vn->sc_flags & VNF_INITED)
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return(EBUSY);
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/*
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* Always open for read and write.
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* This is probably bogus, but it lets vn_open()
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* weed out directories, sockets, etc. so we don't
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* have to worry about them.
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*/
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NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, vio->vn_file, p);
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error = vn_open(&nd, FREAD|FWRITE, 0);
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if (error)
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return(error);
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error = VOP_GETATTR(nd.ni_vp, &vattr, p->p_ucred, p);
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if (error) {
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VOP_UNLOCK(nd.ni_vp);
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(void) vn_close(nd.ni_vp, FREAD|FWRITE, p->p_ucred, p);
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return(error);
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}
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VOP_UNLOCK(nd.ni_vp);
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vn->sc_vp = nd.ni_vp;
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vn->sc_size = btodb(vattr.va_size); /* note truncation */
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error = vnsetcred(vn, p->p_ucred);
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if (error) {
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(void) vn_close(nd.ni_vp, FREAD|FWRITE, p->p_ucred, p);
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return(error);
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}
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vio->vn_size = dbtob(vn->sc_size);
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vn->sc_flags |= VNF_INITED;
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IFOPT(vn, VN_LABELS) {
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/*
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* Reopen so that `ds' knows which devices are open.
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* If this is the first VNIOCSET, then we've
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* guaranteed that the device is the cdev and that
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* no other slices or labels are open. Otherwise,
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* we rely on VNIOCCLR not being abused.
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*/
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error = vnopen(dev, flag, S_IFCHR, p);
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if (error)
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vnclear(vn);
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}
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IFOPT(vn, VN_FOLLOW)
|
|
printf("vnioctl: SET vp %p size %x\n",
|
|
vn->sc_vp, vn->sc_size);
|
|
break;
|
|
|
|
case VNIOCDETACH:
|
|
if ((vn->sc_flags & VNF_INITED) == 0)
|
|
return(ENXIO);
|
|
/*
|
|
* XXX handle i/o in progress. Return EBUSY, or wait, or
|
|
* flush the i/o.
|
|
* XXX handle multiple opens of the device. Return EBUSY,
|
|
* or revoke the fd's.
|
|
* How are these problems handled for removable and failing
|
|
* hardware devices?
|
|
*/
|
|
vnclear(vn);
|
|
IFOPT(vn, VN_FOLLOW)
|
|
printf("vnioctl: CLRed\n");
|
|
break;
|
|
|
|
case VNIOCGSET:
|
|
vn_options |= *f;
|
|
*f = vn_options;
|
|
break;
|
|
|
|
case VNIOCGCLEAR:
|
|
vn_options &= ~(*f);
|
|
*f = vn_options;
|
|
break;
|
|
|
|
case VNIOCUSET:
|
|
vn->sc_options |= *f;
|
|
*f = vn->sc_options;
|
|
break;
|
|
|
|
case VNIOCUCLEAR:
|
|
vn->sc_options &= ~(*f);
|
|
*f = vn->sc_options;
|
|
break;
|
|
|
|
default:
|
|
return (ENOTTY);
|
|
}
|
|
return(0);
|
|
}
|
|
|
|
/*
|
|
* Duplicate the current processes' credentials. Since we are called only
|
|
* as the result of a SET ioctl and only root can do that, any future access
|
|
* to this "disk" is essentially as root. Note that credentials may change
|
|
* if some other uid can write directly to the mapped file (NFS).
|
|
*/
|
|
int
|
|
vnsetcred(struct vn_softc *vn, struct ucred *cred)
|
|
{
|
|
struct uio auio;
|
|
struct iovec aiov;
|
|
char *tmpbuf;
|
|
int error;
|
|
|
|
vn->sc_cred = crdup(cred);
|
|
tmpbuf = malloc(DEV_BSIZE, M_TEMP, M_WAITOK);
|
|
|
|
/* XXX: Horrible kludge to establish credentials for NFS */
|
|
aiov.iov_base = tmpbuf;
|
|
aiov.iov_len = min(DEV_BSIZE, dbtob(vn->sc_size));
|
|
auio.uio_iov = &aiov;
|
|
auio.uio_iovcnt = 1;
|
|
auio.uio_offset = 0;
|
|
auio.uio_rw = UIO_READ;
|
|
auio.uio_segflg = UIO_SYSSPACE;
|
|
auio.uio_resid = aiov.iov_len;
|
|
error = VOP_READ(vn->sc_vp, &auio, 0, vn->sc_cred);
|
|
|
|
free(tmpbuf, M_TEMP);
|
|
return (error);
|
|
}
|
|
|
|
void
|
|
vnshutdown(int howto, void *ignored)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < NVN; i++)
|
|
if (vn_softc[i] && vn_softc[i]->sc_flags & VNF_INITED)
|
|
vnclear(vn_softc[i]);
|
|
}
|
|
|
|
void
|
|
vnclear(struct vn_softc *vn)
|
|
{
|
|
register struct vnode *vp = vn->sc_vp;
|
|
struct proc *p = curproc; /* XXX */
|
|
|
|
IFOPT(vn, VN_FOLLOW)
|
|
printf("vnclear(%p): vp=%p\n", vn, vp);
|
|
vn->sc_flags &= ~VNF_INITED;
|
|
if (vp == (struct vnode *)0)
|
|
panic("vnclear: null vp");
|
|
(void) vn_close(vp, FREAD|FWRITE, vn->sc_cred, p);
|
|
crfree(vn->sc_cred);
|
|
vn->sc_vp = (struct vnode *)0;
|
|
vn->sc_cred = (struct ucred *)0;
|
|
vn->sc_size = 0;
|
|
if (vn->sc_slices != NULL)
|
|
dsgone(&vn->sc_slices);
|
|
}
|
|
|
|
static int
|
|
vnsize(dev_t dev)
|
|
{
|
|
int unit = vnunit(dev);
|
|
|
|
if (unit >= NVN || (!vn_softc[unit]) ||
|
|
(vn_softc[unit]->sc_flags & VNF_INITED) == 0)
|
|
return(-1);
|
|
return(vn_softc[unit]->sc_size);
|
|
}
|
|
|
|
static int
|
|
vndump(dev_t dev)
|
|
{
|
|
return (ENODEV);
|
|
}
|
|
static vn_devsw_installed = 0;
|
|
|
|
static void
|
|
vn_drvinit(void *unused)
|
|
{
|
|
#ifdef DEVFS
|
|
int mynor;
|
|
int unit;
|
|
struct vn_softc *vn;
|
|
#endif
|
|
|
|
if( ! vn_devsw_installed ) {
|
|
if (at_shutdown(&vnshutdown, NULL, SHUTDOWN_POST_SYNC)) {
|
|
printf("vn: could not install shutdown hook\n");
|
|
return;
|
|
}
|
|
bdevsw_add_generic(BDEV_MAJOR, CDEV_MAJOR, &vn_bdevsw);
|
|
#ifdef DEVFS
|
|
for (unit = 0; unit < NVN; unit++) {
|
|
vn = vn_softc[unit];
|
|
mynor = dkmakeminor(unit, WHOLE_DISK_SLICE, RAW_PART);
|
|
/*
|
|
* XXX not saving tokens yet. The vn devices don't
|
|
* exist until after they have been opened :-).
|
|
*/
|
|
devfs_add_devswf(&vn_bdevsw, mynor, DV_BLK,
|
|
UID_ROOT, GID_OPERATOR, 0640,
|
|
"vn%d", unit);
|
|
devfs_add_devswf(&vn_cdevsw, mynor, DV_CHR,
|
|
UID_ROOT, GID_OPERATOR, 0640,
|
|
"rvn%d", unit);
|
|
}
|
|
#endif
|
|
vn_devsw_installed = 1;
|
|
}
|
|
}
|
|
|
|
SYSINIT(vndev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR,vn_drvinit,NULL)
|
|
|
|
|
|
#endif
|