e73453eaf8
associated with the vnode from the buffer cache. This obviates the need to flush the buffer cache manually after ``vnconfig -u''.
1225 lines
29 KiB
C
1225 lines
29 KiB
C
/* $NetBSD: vnd.c,v 1.54 1998/01/26 23:30:44 bad Exp $ */
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|
|
|
/*-
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|
* Copyright (c) 1996, 1997 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
|
|
* This code is derived from software contributed to The NetBSD Foundation
|
|
* by Jason R. Thorpe.
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*
|
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* Redistribution and use in source and binary forms, with or without
|
|
* 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
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by the NetBSD
|
|
* Foundation, Inc. and its contributors.
|
|
* 4. Neither the name of The NetBSD Foundation nor the names of its
|
|
* contributors may be used to endorse or promote products derived
|
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* from this software without specific prior written permission.
|
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*
|
|
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
|
|
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
|
|
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
|
|
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
|
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
|
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
* POSSIBILITY OF SUCH DAMAGE.
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*/
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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
|
|
* Science Department.
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*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by the University of
|
|
* California, Berkeley and its contributors.
|
|
* 4. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* 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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* @(#)vn.c 8.6 (Berkeley) 4/1/94
|
|
*/
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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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*
|
|
* NOTE 2: There is a security issue involved with this driver.
|
|
* Once mounted all access to the contents of the "mapped" file via
|
|
* the special file is controlled by the permissions on the special
|
|
* file, the protection of the mapped file is ignored (effectively,
|
|
* by using root credentials in all transactions).
|
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*
|
|
* NOTE 3: Doesn't interact with leases, should it?
|
|
*/
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#include <sys/param.h>
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#include <sys/systm.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/disklabel.h>
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#include <sys/device.h>
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#include <sys/disk.h>
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#include <sys/stat.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/conf.h>
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|
|
#include <miscfs/specfs/specdev.h>
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|
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#include <dev/vndvar.h>
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|
|
#if defined(VNDDEBUG) && !defined(DEBUG)
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|
#define DEBUG
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|
#endif
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|
|
#ifdef DEBUG
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|
int dovndcluster = 1;
|
|
#define VDB_FOLLOW 0x01
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|
#define VDB_INIT 0x02
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#define VDB_IO 0x04
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#define VDB_LABEL 0x08
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int vnddebug = 0x00;
|
|
#endif
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|
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#define b_cylin b_resid
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|
|
#define vndunit(x) DISKUNIT(x)
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|
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struct vndxfer {
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struct buf *vx_bp; /* Pointer to parent buffer */
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int vx_error;
|
|
int vx_pending; /* # of pending aux buffers */
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|
int vx_flags;
|
|
#define VX_BUSY 1
|
|
};
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|
|
struct vndbuf {
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|
struct buf vb_buf;
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|
struct vndxfer *vb_xfer;
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|
};
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|
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#define getvndxfer() \
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((struct vndxfer *)malloc(sizeof(struct vndxfer), M_DEVBUF, M_WAITOK))
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#define putvndxfer(vnx) \
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free((caddr_t)(vnx), M_DEVBUF)
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#define getvndbuf() \
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((struct vndbuf *)malloc(sizeof(struct vndbuf), M_DEVBUF, M_WAITOK))
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#define putvndbuf(vbp) \
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free((caddr_t)(vbp), M_DEVBUF)
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|
|
struct vnd_softc *vnd_softc;
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|
int numvnd = 0;
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|
|
#define VNDLABELDEV(dev) \
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(MAKEDISKDEV(major((dev)), vndunit((dev)), RAW_PART))
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|
|
/* called by main() at boot time */
|
|
void vndattach __P((int));
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|
|
void vndclear __P((struct vnd_softc *));
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void vndstart __P((struct vnd_softc *));
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int vndsetcred __P((struct vnd_softc *, struct ucred *));
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void vndthrottle __P((struct vnd_softc *, struct vnode *));
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|
void vndiodone __P((struct buf *));
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|
void vndshutdown __P((void));
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|
|
void vndgetdefaultlabel __P((struct vnd_softc *, struct disklabel *));
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|
void vndgetdisklabel __P((dev_t));
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|
|
static int vndlock __P((struct vnd_softc *));
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static void vndunlock __P((struct vnd_softc *));
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|
|
void
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vndattach(num)
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|
int num;
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{
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|
char *mem;
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|
register u_long size;
|
|
|
|
if (num <= 0)
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|
return;
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|
size = num * sizeof(struct vnd_softc);
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|
mem = malloc(size, M_DEVBUF, M_NOWAIT);
|
|
if (mem == NULL) {
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|
printf("WARNING: no memory for vnode disks\n");
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|
return;
|
|
}
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|
bzero(mem, size);
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|
vnd_softc = (struct vnd_softc *)mem;
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|
numvnd = num;
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|
}
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|
int
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|
vndopen(dev, flags, mode, p)
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|
dev_t dev;
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int flags, mode;
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|
struct proc *p;
|
|
{
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|
int unit = vndunit(dev);
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|
struct vnd_softc *sc;
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|
int error = 0, part, pmask;
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|
struct disklabel *lp;
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|
|
#ifdef DEBUG
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if (vnddebug & VDB_FOLLOW)
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|
printf("vndopen(0x%x, 0x%x, 0x%x, %p)\n", dev, flags, mode, p);
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|
#endif
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if (unit >= numvnd)
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return (ENXIO);
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sc = &vnd_softc[unit];
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if ((error = vndlock(sc)) != 0)
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return (error);
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lp = sc->sc_dkdev.dk_label;
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part = DISKPART(dev);
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pmask = (1 << part);
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|
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/*
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* If we're initialized, check to see if there are any other
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* open partitions. If not, then it's safe to update the
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* in-core disklabel.
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|
*/
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if ((sc->sc_flags & VNF_INITED) && (sc->sc_dkdev.dk_openmask == 0))
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vndgetdisklabel(dev);
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|
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/* Check that the partitions exists. */
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if (part != RAW_PART) {
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if (((sc->sc_flags & VNF_INITED) == 0) ||
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((part >= lp->d_npartitions) ||
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(lp->d_partitions[part].p_fstype == FS_UNUSED))) {
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|
error = ENXIO;
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goto done;
|
|
}
|
|
}
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|
|
/* Prevent our unit from being unconfigured while open. */
|
|
switch (mode) {
|
|
case S_IFCHR:
|
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sc->sc_dkdev.dk_copenmask |= pmask;
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break;
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case S_IFBLK:
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sc->sc_dkdev.dk_bopenmask |= pmask;
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break;
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}
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sc->sc_dkdev.dk_openmask =
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sc->sc_dkdev.dk_copenmask | sc->sc_dkdev.dk_bopenmask;
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|
|
done:
|
|
vndunlock(sc);
|
|
return (error);
|
|
}
|
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|
|
int
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|
vndclose(dev, flags, mode, p)
|
|
dev_t dev;
|
|
int flags, mode;
|
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struct proc *p;
|
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{
|
|
int unit = vndunit(dev);
|
|
struct vnd_softc *sc;
|
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int error = 0, part;
|
|
|
|
#ifdef DEBUG
|
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if (vnddebug & VDB_FOLLOW)
|
|
printf("vndclose(0x%x, 0x%x, 0x%x, %p)\n", dev, flags, mode, p);
|
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#endif
|
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|
|
if (unit >= numvnd)
|
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return (ENXIO);
|
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sc = &vnd_softc[unit];
|
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|
|
if ((error = vndlock(sc)) != 0)
|
|
return (error);
|
|
|
|
part = DISKPART(dev);
|
|
|
|
/* ...that much closer to allowing unconfiguration... */
|
|
switch (mode) {
|
|
case S_IFCHR:
|
|
sc->sc_dkdev.dk_copenmask &= ~(1 << part);
|
|
break;
|
|
|
|
case S_IFBLK:
|
|
sc->sc_dkdev.dk_bopenmask &= ~(1 << part);
|
|
break;
|
|
}
|
|
sc->sc_dkdev.dk_openmask =
|
|
sc->sc_dkdev.dk_copenmask | sc->sc_dkdev.dk_bopenmask;
|
|
|
|
vndunlock(sc);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Break the request into bsize pieces and submit using VOP_BMAP/VOP_STRATEGY.
|
|
*/
|
|
void
|
|
vndstrategy(bp)
|
|
register struct buf *bp;
|
|
{
|
|
int unit = vndunit(bp->b_dev);
|
|
struct vnd_softc *vnd = &vnd_softc[unit];
|
|
struct vndxfer *vnx;
|
|
int s, bn, bsize, resid;
|
|
caddr_t addr;
|
|
int sz, flags, error, wlabel;
|
|
struct disklabel *lp;
|
|
struct partition *pp;
|
|
|
|
#ifdef DEBUG
|
|
if (vnddebug & VDB_FOLLOW)
|
|
printf("vndstrategy(%p): unit %d\n", bp, unit);
|
|
#endif
|
|
if ((vnd->sc_flags & VNF_INITED) == 0) {
|
|
bp->b_error = ENXIO;
|
|
bp->b_flags |= B_ERROR;
|
|
goto done;
|
|
}
|
|
|
|
/* If it's a nil transfer, wake up the top half now. */
|
|
if (bp->b_bcount == 0)
|
|
goto done;
|
|
|
|
lp = vnd->sc_dkdev.dk_label;
|
|
|
|
/*
|
|
* The transfer must be a whole number of blocks.
|
|
*/
|
|
if ((bp->b_bcount % lp->d_secsize) != 0) {
|
|
bp->b_error = EINVAL;
|
|
bp->b_flags |= B_ERROR;
|
|
goto done;
|
|
}
|
|
|
|
/*
|
|
* Do bounds checking and adjust transfer. If there's an error,
|
|
* the bounds check will flag that for us.
|
|
*/
|
|
wlabel = vnd->sc_flags & (VNF_WLABEL|VNF_LABELLING);
|
|
if (DISKPART(bp->b_dev) != RAW_PART)
|
|
if (bounds_check_with_label(bp, lp, wlabel) <= 0)
|
|
goto done;
|
|
|
|
bp->b_resid = bp->b_bcount;
|
|
|
|
/*
|
|
* Put the block number in terms of the logical blocksize
|
|
* of the "device".
|
|
*/
|
|
bn = bp->b_blkno / (lp->d_secsize / DEV_BSIZE);
|
|
|
|
/*
|
|
* Translate the partition-relative block number to an absolute.
|
|
*/
|
|
if (DISKPART(bp->b_dev) != RAW_PART) {
|
|
pp = &vnd->sc_dkdev.dk_label->d_partitions[DISKPART(bp->b_dev)];
|
|
bn += pp->p_offset;
|
|
}
|
|
|
|
/* ...and convert to a byte offset within the file. */
|
|
bn *= lp->d_secsize;
|
|
|
|
bsize = vnd->sc_vp->v_mount->mnt_stat.f_iosize;
|
|
addr = bp->b_data;
|
|
flags = bp->b_flags | B_CALL;
|
|
|
|
/* Allocate a header for this transfer and link it to the buffer */
|
|
vnx = getvndxfer();
|
|
vnx->vx_flags = VX_BUSY;
|
|
vnx->vx_error = 0;
|
|
vnx->vx_pending = 0;
|
|
vnx->vx_bp = bp;
|
|
|
|
for (resid = bp->b_resid; resid; resid -= sz) {
|
|
struct vndbuf *nbp;
|
|
struct vnode *vp;
|
|
daddr_t nbn;
|
|
int off, nra, dolock = 0;
|
|
|
|
nra = 0;
|
|
/*
|
|
* XXX check if vnode is already locked, to avoid
|
|
* recursive locking. The real solution is to
|
|
* allow recursive locks here, but the interface
|
|
* doesn't allow it.
|
|
*/
|
|
if (!VOP_ISLOCKED(vnd->sc_vp)) {
|
|
dolock = 1;
|
|
VOP_LOCK(vnd->sc_vp);
|
|
}
|
|
error = VOP_BMAP(vnd->sc_vp, bn / bsize, &vp, &nbn, &nra);
|
|
if (dolock)
|
|
VOP_UNLOCK(vnd->sc_vp);
|
|
|
|
if (error == 0 && (long)nbn == -1)
|
|
error = EIO;
|
|
|
|
/*
|
|
* If there was an error or a hole in the file...punt.
|
|
* Note that we may have to wait for any operations
|
|
* that we have already fired off before releasing
|
|
* the buffer.
|
|
*
|
|
* XXX we could deal with holes here but it would be
|
|
* a hassle (in the write case).
|
|
*/
|
|
if (error) {
|
|
s = splbio();
|
|
vnx->vx_error = error;
|
|
goto out;
|
|
}
|
|
|
|
#ifdef DEBUG
|
|
if (!dovndcluster)
|
|
nra = 0;
|
|
#endif
|
|
|
|
if ((off = bn % bsize) != 0)
|
|
sz = bsize - off;
|
|
else
|
|
sz = (1 + nra) * bsize;
|
|
if (resid < sz)
|
|
sz = resid;
|
|
#ifdef DEBUG
|
|
if (vnddebug & VDB_IO)
|
|
printf("vndstrategy: vp %p/%p bn 0x%x/0x%x sz 0x%x\n",
|
|
vnd->sc_vp, vp, bn, nbn, sz);
|
|
#endif
|
|
|
|
nbp = getvndbuf();
|
|
nbp->vb_buf.b_flags = flags;
|
|
nbp->vb_buf.b_bcount = sz;
|
|
nbp->vb_buf.b_bufsize = bp->b_bufsize;
|
|
nbp->vb_buf.b_error = 0;
|
|
nbp->vb_buf.b_data = addr;
|
|
nbp->vb_buf.b_blkno = nbn + btodb(off);
|
|
nbp->vb_buf.b_proc = bp->b_proc;
|
|
nbp->vb_buf.b_iodone = vndiodone;
|
|
nbp->vb_buf.b_vp = NULLVP;
|
|
nbp->vb_buf.b_rcred = vnd->sc_cred; /* XXX crdup? */
|
|
nbp->vb_buf.b_wcred = vnd->sc_cred; /* XXX crdup? */
|
|
if (bp->b_dirtyend == 0) {
|
|
nbp->vb_buf.b_dirtyoff = 0;
|
|
nbp->vb_buf.b_dirtyend = sz;
|
|
} else {
|
|
nbp->vb_buf.b_dirtyoff =
|
|
max(0, bp->b_dirtyoff - (bp->b_bcount - resid));
|
|
nbp->vb_buf.b_dirtyend =
|
|
min(sz,
|
|
max(0, bp->b_dirtyend - (bp->b_bcount-resid)));
|
|
}
|
|
if (bp->b_validend == 0) {
|
|
nbp->vb_buf.b_validoff = 0;
|
|
nbp->vb_buf.b_validend = sz;
|
|
} else {
|
|
nbp->vb_buf.b_validoff =
|
|
max(0, bp->b_validoff - (bp->b_bcount - resid));
|
|
nbp->vb_buf.b_validend =
|
|
min(sz,
|
|
max(0, bp->b_validend - (bp->b_bcount-resid)));
|
|
}
|
|
|
|
nbp->vb_xfer = vnx;
|
|
|
|
/*
|
|
* Just sort by block number
|
|
*/
|
|
nbp->vb_buf.b_cylin = nbp->vb_buf.b_blkno;
|
|
s = splbio();
|
|
if (vnx->vx_error != 0) {
|
|
putvndbuf(nbp);
|
|
goto out;
|
|
}
|
|
vnx->vx_pending++;
|
|
bgetvp(vp, &nbp->vb_buf);
|
|
disksort(&vnd->sc_tab, &nbp->vb_buf);
|
|
vndstart(vnd);
|
|
splx(s);
|
|
bn += sz;
|
|
addr += sz;
|
|
}
|
|
|
|
s = splbio();
|
|
|
|
out: /* Arrive here at splbio */
|
|
vnx->vx_flags &= ~VX_BUSY;
|
|
if (vnx->vx_pending == 0) {
|
|
if (vnx->vx_error != 0) {
|
|
bp->b_error = vnx->vx_error;
|
|
bp->b_flags |= B_ERROR;
|
|
}
|
|
putvndxfer(vnx);
|
|
biodone(bp);
|
|
}
|
|
splx(s);
|
|
return;
|
|
|
|
done:
|
|
biodone(bp);
|
|
}
|
|
|
|
/*
|
|
* Feed requests sequentially.
|
|
* We do it this way to keep from flooding NFS servers if we are connected
|
|
* to an NFS file. This places the burden on the client rather than the
|
|
* server.
|
|
*/
|
|
void
|
|
vndstart(vnd)
|
|
register struct vnd_softc *vnd;
|
|
{
|
|
struct buf *bp;
|
|
|
|
/*
|
|
* Dequeue now since lower level strategy routine might
|
|
* queue using same links
|
|
*/
|
|
|
|
if ((vnd->sc_flags & VNF_BUSY) != 0)
|
|
return;
|
|
|
|
vnd->sc_flags |= VNF_BUSY;
|
|
|
|
while (vnd->sc_tab.b_active < vnd->sc_maxactive) {
|
|
bp = vnd->sc_tab.b_actf;
|
|
if (bp == NULL)
|
|
break;
|
|
vnd->sc_tab.b_actf = bp->b_actf;
|
|
vnd->sc_tab.b_active++;
|
|
#ifdef DEBUG
|
|
if (vnddebug & VDB_IO)
|
|
printf("vndstart(%ld): bp %p vp %p blkno 0x%x addr %p cnt 0x%lx\n",
|
|
(long) (vnd-vnd_softc), bp, bp->b_vp, bp->b_blkno,
|
|
bp->b_data, bp->b_bcount);
|
|
#endif
|
|
|
|
/* Instrumentation. */
|
|
disk_busy(&vnd->sc_dkdev);
|
|
|
|
if ((bp->b_flags & B_READ) == 0)
|
|
bp->b_vp->v_numoutput++;
|
|
VOP_STRATEGY(bp);
|
|
}
|
|
vnd->sc_flags &= ~VNF_BUSY;
|
|
}
|
|
|
|
void
|
|
vndiodone(bp)
|
|
struct buf *bp;
|
|
{
|
|
register struct vndbuf *vbp = (struct vndbuf *) bp;
|
|
register struct vndxfer *vnx = (struct vndxfer *)vbp->vb_xfer;
|
|
register struct buf *pbp = vnx->vx_bp;
|
|
register struct vnd_softc *vnd = &vnd_softc[vndunit(pbp->b_dev)];
|
|
int s, resid;
|
|
|
|
s = splbio();
|
|
#ifdef DEBUG
|
|
if (vnddebug & VDB_IO)
|
|
printf("vndiodone(%ld): vbp %p vp %p blkno 0x%x addr %p cnt 0x%lx\n",
|
|
(long) (vnd-vnd_softc), vbp, vbp->vb_buf.b_vp,
|
|
vbp->vb_buf.b_blkno, vbp->vb_buf.b_data,
|
|
vbp->vb_buf.b_bcount);
|
|
#endif
|
|
|
|
resid = vbp->vb_buf.b_bcount - vbp->vb_buf.b_resid;
|
|
pbp->b_resid -= resid;
|
|
disk_unbusy(&vnd->sc_dkdev, resid);
|
|
vnx->vx_pending--;
|
|
|
|
if (vbp->vb_buf.b_error) {
|
|
#ifdef DEBUG
|
|
if (vnddebug & VDB_IO)
|
|
printf("vndiodone: vbp %p error %d\n", vbp,
|
|
vbp->vb_buf.b_error);
|
|
#endif
|
|
vnx->vx_error = vbp->vb_buf.b_error;
|
|
}
|
|
|
|
if (vbp->vb_buf.b_vp != NULLVP)
|
|
brelvp(&vbp->vb_buf);
|
|
|
|
putvndbuf(vbp);
|
|
|
|
/*
|
|
* Wrap up this transaction if it has run to completion or, in
|
|
* case of an error, when all auxiliary buffers have returned.
|
|
*/
|
|
if (vnx->vx_error != 0) {
|
|
pbp->b_flags |= B_ERROR;
|
|
pbp->b_error = vnx->vx_error;
|
|
if ((vnx->vx_flags & VX_BUSY) == 0 && vnx->vx_pending == 0) {
|
|
|
|
#ifdef DEBUG
|
|
if (vnddebug & VDB_IO)
|
|
printf("vndiodone: pbp %p iodone: error %d\n",
|
|
pbp, vnx->vx_error);
|
|
#endif
|
|
putvndxfer(vnx);
|
|
biodone(pbp);
|
|
}
|
|
} else if (pbp->b_resid == 0) {
|
|
|
|
#ifdef DIAGNOSTIC
|
|
if (vnx->vx_pending != 0)
|
|
panic("vndiodone: vnx pending: %d", vnx->vx_pending);
|
|
#endif
|
|
|
|
if ((vnx->vx_flags & VX_BUSY) == 0) {
|
|
#ifdef DEBUG
|
|
if (vnddebug & VDB_IO)
|
|
printf("vndiodone: pbp %p iodone\n", pbp);
|
|
#endif
|
|
putvndxfer(vnx);
|
|
biodone(pbp);
|
|
}
|
|
}
|
|
|
|
vnd->sc_tab.b_active--;
|
|
vndstart(vnd);
|
|
splx(s);
|
|
}
|
|
|
|
/* ARGSUSED */
|
|
int
|
|
vndread(dev, uio, flags)
|
|
dev_t dev;
|
|
struct uio *uio;
|
|
int flags;
|
|
{
|
|
int unit = vndunit(dev);
|
|
struct vnd_softc *sc;
|
|
|
|
#ifdef DEBUG
|
|
if (vnddebug & VDB_FOLLOW)
|
|
printf("vndread(0x%x, %p)\n", dev, uio);
|
|
#endif
|
|
|
|
if (unit >= numvnd)
|
|
return (ENXIO);
|
|
sc = &vnd_softc[unit];
|
|
|
|
if ((sc->sc_flags & VNF_INITED) == 0)
|
|
return (ENXIO);
|
|
|
|
return (physio(vndstrategy, NULL, dev, B_READ, minphys, uio));
|
|
}
|
|
|
|
/* ARGSUSED */
|
|
int
|
|
vndwrite(dev, uio, flags)
|
|
dev_t dev;
|
|
struct uio *uio;
|
|
int flags;
|
|
{
|
|
int unit = vndunit(dev);
|
|
struct vnd_softc *sc;
|
|
|
|
#ifdef DEBUG
|
|
if (vnddebug & VDB_FOLLOW)
|
|
printf("vndwrite(0x%x, %p)\n", dev, uio);
|
|
#endif
|
|
|
|
if (unit >= numvnd)
|
|
return (ENXIO);
|
|
sc = &vnd_softc[unit];
|
|
|
|
if ((sc->sc_flags & VNF_INITED) == 0)
|
|
return (ENXIO);
|
|
|
|
return (physio(vndstrategy, NULL, dev, B_WRITE, minphys, uio));
|
|
}
|
|
|
|
/* ARGSUSED */
|
|
int
|
|
vndioctl(dev, cmd, data, flag, p)
|
|
dev_t dev;
|
|
u_long cmd;
|
|
caddr_t data;
|
|
int flag;
|
|
struct proc *p;
|
|
{
|
|
int unit = vndunit(dev);
|
|
register struct vnd_softc *vnd;
|
|
struct vnd_ioctl *vio;
|
|
struct vattr vattr;
|
|
struct nameidata nd;
|
|
int error, part, pmask;
|
|
size_t geomsize;
|
|
|
|
#ifdef DEBUG
|
|
if (vnddebug & VDB_FOLLOW)
|
|
printf("vndioctl(0x%x, 0x%lx, %p, 0x%x, %p): unit %d\n",
|
|
dev, cmd, data, flag, p, unit);
|
|
#endif
|
|
error = suser(p->p_ucred, &p->p_acflag);
|
|
if (error)
|
|
return (error);
|
|
if (unit >= numvnd)
|
|
return (ENXIO);
|
|
|
|
vnd = &vnd_softc[unit];
|
|
vio = (struct vnd_ioctl *)data;
|
|
|
|
/* Must be open for writes for these commands... */
|
|
switch (cmd) {
|
|
case VNDIOCSET:
|
|
case VNDIOCCLR:
|
|
case DIOCSDINFO:
|
|
case DIOCWDINFO:
|
|
case DIOCWLABEL:
|
|
if ((flag & FWRITE) == 0)
|
|
return (EBADF);
|
|
}
|
|
|
|
/* Must be initialized for these... */
|
|
switch (cmd) {
|
|
case VNDIOCCLR:
|
|
case DIOCGDINFO:
|
|
case DIOCSDINFO:
|
|
case DIOCWDINFO:
|
|
case DIOCGPART:
|
|
case DIOCWLABEL:
|
|
case DIOCGDEFLABEL:
|
|
if ((vnd->sc_flags & VNF_INITED) == 0)
|
|
return (ENXIO);
|
|
}
|
|
|
|
switch (cmd) {
|
|
case VNDIOCSET:
|
|
if (vnd->sc_flags & VNF_INITED)
|
|
return (EBUSY);
|
|
|
|
if ((error = vndlock(vnd)) != 0)
|
|
return (error);
|
|
|
|
/*
|
|
* Always open for read and write.
|
|
* This is probably bogus, but it lets vn_open()
|
|
* weed out directories, sockets, etc. so we don't
|
|
* have to worry about them.
|
|
*/
|
|
NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, vio->vnd_file, p);
|
|
if ((error = vn_open(&nd, FREAD|FWRITE, 0)) != 0) {
|
|
vndunlock(vnd);
|
|
return(error);
|
|
}
|
|
error = VOP_GETATTR(nd.ni_vp, &vattr, p->p_ucred, p);
|
|
if (error) {
|
|
VOP_UNLOCK(nd.ni_vp);
|
|
(void) vn_close(nd.ni_vp, FREAD|FWRITE, p->p_ucred, p);
|
|
vndunlock(vnd);
|
|
return(error);
|
|
}
|
|
VOP_UNLOCK(nd.ni_vp);
|
|
vnd->sc_vp = nd.ni_vp;
|
|
vnd->sc_size = btodb(vattr.va_size); /* note truncation */
|
|
|
|
/*
|
|
* Use pseudo-geometry specified. If none was provided,
|
|
* use "standard" Adaptec fictitious geometry.
|
|
*/
|
|
if (vio->vnd_flags & VNDIOF_HASGEOM) {
|
|
|
|
bcopy(&vio->vnd_geom, &vnd->sc_geom,
|
|
sizeof(vio->vnd_geom));
|
|
|
|
/*
|
|
* Sanity-check the sector size.
|
|
* XXX Don't allow secsize < DEV_BSIZE. Should
|
|
* XXX we?
|
|
*/
|
|
if (vnd->sc_geom.vng_secsize < DEV_BSIZE ||
|
|
(vnd->sc_geom.vng_secsize % DEV_BSIZE) != 0) {
|
|
(void) vn_close(nd.ni_vp, FREAD|FWRITE,
|
|
p->p_ucred, p);
|
|
vndunlock(vnd);
|
|
return (EINVAL);
|
|
}
|
|
|
|
/*
|
|
* Compute the size (in DEV_BSIZE blocks) specified
|
|
* by the geometry.
|
|
*/
|
|
geomsize = (vnd->sc_geom.vng_nsectors *
|
|
vnd->sc_geom.vng_ntracks *
|
|
vnd->sc_geom.vng_ncylinders) *
|
|
(vnd->sc_geom.vng_secsize / DEV_BSIZE);
|
|
|
|
/*
|
|
* Sanity-check the size against the specified
|
|
* geometry.
|
|
*/
|
|
if (vnd->sc_size < geomsize) {
|
|
(void) vn_close(nd.ni_vp, FREAD|FWRITE,
|
|
p->p_ucred, p);
|
|
vndunlock(vnd);
|
|
return (EINVAL);
|
|
}
|
|
} else {
|
|
/*
|
|
* Size must be at least 2048 DEV_BSIZE blocks
|
|
* (1M) in order to use this geometry.
|
|
*/
|
|
if (vnd->sc_size < (32 * 64)) {
|
|
vndunlock(vnd);
|
|
return (EINVAL);
|
|
}
|
|
|
|
vnd->sc_geom.vng_secsize = DEV_BSIZE;
|
|
vnd->sc_geom.vng_nsectors = 32;
|
|
vnd->sc_geom.vng_ntracks = 64;
|
|
vnd->sc_geom.vng_ncylinders = vnd->sc_size / (64 * 32);
|
|
|
|
/*
|
|
* Compute the actual size allowed by this geometry.
|
|
*/
|
|
geomsize = 32 * 64 * vnd->sc_geom.vng_ncylinders;
|
|
}
|
|
|
|
/*
|
|
* Truncate the size to that specified by
|
|
* the geometry.
|
|
* XXX Should we even bother with this?
|
|
*/
|
|
vnd->sc_size = geomsize;
|
|
|
|
if ((error = vndsetcred(vnd, p->p_ucred)) != 0) {
|
|
(void) vn_close(nd.ni_vp, FREAD|FWRITE, p->p_ucred, p);
|
|
vndunlock(vnd);
|
|
return(error);
|
|
}
|
|
vndthrottle(vnd, vnd->sc_vp);
|
|
vio->vnd_size = dbtob(vnd->sc_size);
|
|
vnd->sc_flags |= VNF_INITED;
|
|
#ifdef DEBUG
|
|
if (vnddebug & VDB_INIT)
|
|
printf("vndioctl: SET vp %p size 0x%lx %d/%d/%d/%d\n",
|
|
vnd->sc_vp, (unsigned long) vnd->sc_size,
|
|
vnd->sc_geom.vng_secsize,
|
|
vnd->sc_geom.vng_nsectors,
|
|
vnd->sc_geom.vng_ntracks,
|
|
vnd->sc_geom.vng_ncylinders);
|
|
#endif
|
|
|
|
/* Attach the disk. */
|
|
bzero(vnd->sc_xname, sizeof(vnd->sc_xname)); /* XXX */
|
|
sprintf(vnd->sc_xname, "vnd%d", unit); /* XXX */
|
|
vnd->sc_dkdev.dk_name = vnd->sc_xname;
|
|
disk_attach(&vnd->sc_dkdev);
|
|
|
|
/* Try and read the disklabel. */
|
|
vndgetdisklabel(dev);
|
|
|
|
vndunlock(vnd);
|
|
|
|
break;
|
|
|
|
case VNDIOCCLR:
|
|
if ((error = vndlock(vnd)) != 0)
|
|
return (error);
|
|
|
|
/*
|
|
* Don't unconfigure if any other partitions are open
|
|
* or if both the character and block flavors of this
|
|
* partition are open.
|
|
*/
|
|
part = DISKPART(dev);
|
|
pmask = (1 << part);
|
|
if ((vnd->sc_dkdev.dk_openmask & ~pmask) ||
|
|
((vnd->sc_dkdev.dk_bopenmask & pmask) &&
|
|
(vnd->sc_dkdev.dk_copenmask & pmask))) {
|
|
vndunlock(vnd);
|
|
return (EBUSY);
|
|
}
|
|
|
|
vndclear(vnd);
|
|
#ifdef DEBUG
|
|
if (vnddebug & VDB_INIT)
|
|
printf("vndioctl: CLRed\n");
|
|
#endif
|
|
|
|
/* Detatch the disk. */
|
|
disk_detach(&vnd->sc_dkdev);
|
|
|
|
vndunlock(vnd);
|
|
|
|
break;
|
|
|
|
case DIOCGDINFO:
|
|
*(struct disklabel *)data = *(vnd->sc_dkdev.dk_label);
|
|
break;
|
|
|
|
case DIOCGPART:
|
|
((struct partinfo *)data)->disklab = vnd->sc_dkdev.dk_label;
|
|
((struct partinfo *)data)->part =
|
|
&vnd->sc_dkdev.dk_label->d_partitions[DISKPART(dev)];
|
|
break;
|
|
|
|
case DIOCWDINFO:
|
|
case DIOCSDINFO:
|
|
if ((error = vndlock(vnd)) != 0)
|
|
return (error);
|
|
|
|
vnd->sc_flags |= VNF_LABELLING;
|
|
|
|
error = setdisklabel(vnd->sc_dkdev.dk_label,
|
|
(struct disklabel *)data, 0, vnd->sc_dkdev.dk_cpulabel);
|
|
if (error == 0) {
|
|
if (cmd == DIOCWDINFO)
|
|
error = writedisklabel(VNDLABELDEV(dev),
|
|
vndstrategy, vnd->sc_dkdev.dk_label,
|
|
vnd->sc_dkdev.dk_cpulabel);
|
|
}
|
|
|
|
vnd->sc_flags &= ~VNF_LABELLING;
|
|
|
|
vndunlock(vnd);
|
|
|
|
if (error)
|
|
return (error);
|
|
break;
|
|
|
|
case DIOCWLABEL:
|
|
if (*(int *)data != 0)
|
|
vnd->sc_flags |= VNF_WLABEL;
|
|
else
|
|
vnd->sc_flags &= ~VNF_WLABEL;
|
|
break;
|
|
|
|
case DIOCGDEFLABEL:
|
|
vndgetdefaultlabel(vnd, (struct disklabel *)data);
|
|
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
|
|
vndsetcred(vnd, cred)
|
|
register struct vnd_softc *vnd;
|
|
struct ucred *cred;
|
|
{
|
|
struct uio auio;
|
|
struct iovec aiov;
|
|
char *tmpbuf;
|
|
int error;
|
|
|
|
vnd->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(vnd->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;
|
|
VOP_LOCK(vnd->sc_vp);
|
|
error = VOP_READ(vnd->sc_vp, &auio, 0, vnd->sc_cred);
|
|
if (error == 0) {
|
|
/*
|
|
* Because vnd does all IO directly through the vnode
|
|
* we need to flush (atleast) the buffer from the above
|
|
* VOP_READ from the buffer cache to prevent cache
|
|
* incoherencies. Also, be careful to write dirty
|
|
* buffers back to stable storage.
|
|
*/
|
|
error = vinvalbuf(vnd->sc_vp, V_SAVE, vnd->sc_cred,
|
|
curproc, 0, 0);
|
|
}
|
|
VOP_UNLOCK(vnd->sc_vp);
|
|
|
|
free(tmpbuf, M_TEMP);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Set maxactive based on FS type
|
|
*/
|
|
void
|
|
vndthrottle(vnd, vp)
|
|
register struct vnd_softc *vnd;
|
|
struct vnode *vp;
|
|
{
|
|
#ifdef NFS
|
|
extern int (**nfsv2_vnodeop_p) __P((void *));
|
|
|
|
if (vp->v_op == nfsv2_vnodeop_p)
|
|
vnd->sc_maxactive = 2;
|
|
else
|
|
#endif
|
|
vnd->sc_maxactive = 8;
|
|
|
|
if (vnd->sc_maxactive < 1)
|
|
vnd->sc_maxactive = 1;
|
|
}
|
|
|
|
void
|
|
vndshutdown()
|
|
{
|
|
register struct vnd_softc *vnd;
|
|
|
|
for (vnd = &vnd_softc[0]; vnd < &vnd_softc[numvnd]; vnd++)
|
|
if (vnd->sc_flags & VNF_INITED)
|
|
vndclear(vnd);
|
|
}
|
|
|
|
void
|
|
vndclear(vnd)
|
|
register struct vnd_softc *vnd;
|
|
{
|
|
register struct vnode *vp = vnd->sc_vp;
|
|
struct proc *p = curproc; /* XXX */
|
|
|
|
#ifdef DEBUG
|
|
if (vnddebug & VDB_FOLLOW)
|
|
printf("vndclear(%p): vp %p\n", vnd, vp);
|
|
#endif
|
|
vnd->sc_flags &= ~VNF_INITED;
|
|
if (vp == (struct vnode *)0)
|
|
panic("vndioctl: null vp");
|
|
(void) vn_close(vp, FREAD|FWRITE, vnd->sc_cred, p);
|
|
crfree(vnd->sc_cred);
|
|
vnd->sc_vp = (struct vnode *)0;
|
|
vnd->sc_cred = (struct ucred *)0;
|
|
vnd->sc_size = 0;
|
|
}
|
|
|
|
int
|
|
vndsize(dev)
|
|
dev_t dev;
|
|
{
|
|
struct vnd_softc *sc;
|
|
struct disklabel *lp;
|
|
int part, unit, omask;
|
|
int size;
|
|
|
|
unit = vndunit(dev);
|
|
if (unit >= numvnd)
|
|
return (-1);
|
|
sc = &vnd_softc[unit];
|
|
|
|
if ((sc->sc_flags & VNF_INITED) == 0)
|
|
return (-1);
|
|
|
|
part = DISKPART(dev);
|
|
omask = sc->sc_dkdev.dk_openmask & (1 << part);
|
|
lp = sc->sc_dkdev.dk_label;
|
|
|
|
if (omask == 0 && vndopen(dev, 0, S_IFBLK, curproc))
|
|
return (-1);
|
|
|
|
if (lp->d_partitions[part].p_fstype != FS_SWAP)
|
|
size = -1;
|
|
else
|
|
size = lp->d_partitions[part].p_size *
|
|
(lp->d_secsize / DEV_BSIZE);
|
|
|
|
if (omask == 0 && vndclose(dev, 0, S_IFBLK, curproc))
|
|
return (-1);
|
|
|
|
return (size);
|
|
}
|
|
|
|
int
|
|
vnddump(dev, blkno, va, size)
|
|
dev_t dev;
|
|
daddr_t blkno;
|
|
caddr_t va;
|
|
size_t size;
|
|
{
|
|
|
|
/* Not implemented. */
|
|
return ENXIO;
|
|
}
|
|
|
|
void
|
|
vndgetdefaultlabel(sc, lp)
|
|
struct vnd_softc *sc;
|
|
struct disklabel *lp;
|
|
{
|
|
struct vndgeom *vng = &sc->sc_geom;
|
|
struct partition *pp;
|
|
|
|
bzero(lp, sizeof(*lp));
|
|
|
|
lp->d_secperunit = sc->sc_size / (vng->vng_secsize / DEV_BSIZE);
|
|
lp->d_secsize = vng->vng_secsize;
|
|
lp->d_nsectors = vng->vng_nsectors;
|
|
lp->d_ntracks = vng->vng_ntracks;
|
|
lp->d_ncylinders = vng->vng_ncylinders;
|
|
lp->d_secpercyl = lp->d_ntracks * lp->d_nsectors;
|
|
|
|
strncpy(lp->d_typename, "vnd", sizeof(lp->d_typename));
|
|
lp->d_type = DTYPE_VND;
|
|
strncpy(lp->d_packname, "fictitious", sizeof(lp->d_packname));
|
|
lp->d_rpm = 3600;
|
|
lp->d_interleave = 1;
|
|
lp->d_flags = 0;
|
|
|
|
pp = &lp->d_partitions[RAW_PART];
|
|
pp->p_offset = 0;
|
|
pp->p_size = lp->d_secperunit;
|
|
pp->p_fstype = FS_UNUSED;
|
|
lp->d_npartitions = RAW_PART + 1;
|
|
|
|
lp->d_magic = DISKMAGIC;
|
|
lp->d_magic2 = DISKMAGIC;
|
|
lp->d_checksum = dkcksum(lp);
|
|
}
|
|
|
|
/*
|
|
* Read the disklabel from a vnd. If one is not present, create a fake one.
|
|
*/
|
|
void
|
|
vndgetdisklabel(dev)
|
|
dev_t dev;
|
|
{
|
|
struct vnd_softc *sc = &vnd_softc[vndunit(dev)];
|
|
char *errstring;
|
|
struct disklabel *lp = sc->sc_dkdev.dk_label;
|
|
struct cpu_disklabel *clp = sc->sc_dkdev.dk_cpulabel;
|
|
int i;
|
|
|
|
bzero(clp, sizeof(*clp));
|
|
|
|
vndgetdefaultlabel(sc, lp);
|
|
|
|
/*
|
|
* Call the generic disklabel extraction routine.
|
|
*/
|
|
errstring = readdisklabel(VNDLABELDEV(dev), vndstrategy, lp, clp);
|
|
if (errstring) {
|
|
/*
|
|
* Lack of disklabel is common, but we print the warning
|
|
* anyway, since it might contain other useful information.
|
|
*/
|
|
printf("%s: %s\n", sc->sc_xname, errstring);
|
|
|
|
/*
|
|
* For historical reasons, if there's no disklabel
|
|
* present, all partitions must be FS_BSDFFS and
|
|
* occupy the entire disk.
|
|
*/
|
|
for (i = 0; i < MAXPARTITIONS; i++) {
|
|
/*
|
|
* Don't wipe out port specific hack (such as
|
|
* dos partition hack of i386 port).
|
|
*/
|
|
if (lp->d_partitions[i].p_fstype != FS_UNUSED)
|
|
continue;
|
|
|
|
lp->d_partitions[i].p_size = lp->d_secperunit;
|
|
lp->d_partitions[i].p_offset = 0;
|
|
lp->d_partitions[i].p_fstype = FS_BSDFFS;
|
|
}
|
|
|
|
strncpy(lp->d_packname, "default label",
|
|
sizeof(lp->d_packname));
|
|
|
|
lp->d_checksum = dkcksum(lp);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Wait interruptibly for an exclusive lock.
|
|
*
|
|
* XXX
|
|
* Several drivers do this; it should be abstracted and made MP-safe.
|
|
*/
|
|
static int
|
|
vndlock(sc)
|
|
struct vnd_softc *sc;
|
|
{
|
|
int error;
|
|
|
|
while ((sc->sc_flags & VNF_LOCKED) != 0) {
|
|
sc->sc_flags |= VNF_WANTED;
|
|
if ((error = tsleep(sc, PRIBIO | PCATCH, "vndlck", 0)) != 0)
|
|
return (error);
|
|
}
|
|
sc->sc_flags |= VNF_LOCKED;
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Unlock and wake up any waiters.
|
|
*/
|
|
static void
|
|
vndunlock(sc)
|
|
struct vnd_softc *sc;
|
|
{
|
|
|
|
sc->sc_flags &= ~VNF_LOCKED;
|
|
if ((sc->sc_flags & VNF_WANTED) != 0) {
|
|
sc->sc_flags &= ~VNF_WANTED;
|
|
wakeup(sc);
|
|
}
|
|
}
|