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NetBSD/sys/dev/vnd.c

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/* $NetBSD: vnd.c,v 1.104 2003/10/19 07:41:19 scw Exp $ */
/*-
* Copyright (c) 1996, 1997, 1998 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Jason R. Thorpe.
*
* 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 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
* from this software without specific prior written permission.
*
* 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
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/*
* Copyright (c) 1990, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* the Systems Programming Group of the University of Utah Computer
* Science Department.
*
* 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. 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
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* from: Utah $Hdr: vn.c 1.13 94/04/02$
*
* @(#)vn.c 8.9 (Berkeley) 5/14/95
*/
/*
* Copyright (c) 1988 University of Utah.
*
* This code is derived from software contributed to Berkeley by
* the Systems Programming Group of the University of Utah Computer
* Science Department.
*
* 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
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* from: Utah $Hdr: vn.c 1.13 94/04/02$
*
* @(#)vn.c 8.9 (Berkeley) 5/14/95
*/
/*
* Vnode disk driver.
*
* Block/character interface to a vnode. Allows one to treat a file
* as a disk (e.g. build a filesystem in it, mount it, etc.).
*
* NOTE 1: This uses the VOP_BMAP/VOP_STRATEGY interface to the vnode
* instead of a simple VOP_RDWR. We do this to avoid distorting the
* local buffer cache.
*
* 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).
*
* NOTE 3: Doesn't interact with leases, should it?
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: vnd.c,v 1.104 2003/10/19 07:41:19 scw Exp $");
#if defined(_KERNEL_OPT)
#include "fs_nfs.h"
#endif
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/namei.h>
#include <sys/proc.h>
#include <sys/errno.h>
#include <sys/buf.h>
#include <sys/malloc.h>
#include <sys/ioctl.h>
#include <sys/disklabel.h>
#include <sys/device.h>
#include <sys/disk.h>
#include <sys/stat.h>
#include <sys/mount.h>
#include <sys/vnode.h>
#include <sys/file.h>
#include <sys/uio.h>
#include <sys/conf.h>
#include <miscfs/specfs/specdev.h>
#include <dev/vndvar.h>
#if defined(VNDDEBUG) && !defined(DEBUG)
#define DEBUG
#endif
#ifdef DEBUG
int dovndcluster = 1;
#define VDB_FOLLOW 0x01
#define VDB_INIT 0x02
#define VDB_IO 0x04
#define VDB_LABEL 0x08
int vnddebug = 0x00;
#endif
#define vndunit(x) DISKUNIT(x)
struct vndxfer {
struct buf *vx_bp; /* Pointer to parent buffer */
int vx_error;
int vx_pending; /* # of pending aux buffers */
int vx_flags;
#define VX_BUSY 1
};
struct vndbuf {
struct buf vb_buf;
struct vndxfer *vb_xfer;
};
#define VND_GETXFER(vnd) pool_get(&(vnd)->sc_vxpool, PR_NOWAIT)
#define VND_PUTXFER(vnd, vx) pool_put(&(vnd)->sc_vxpool, (vx))
#define VND_GETBUF(vnd) pool_get(&(vnd)->sc_vbpool, PR_NOWAIT)
#define VND_PUTBUF(vnd, vb) pool_put(&(vnd)->sc_vbpool, (vb))
struct vnd_softc *vnd_softc;
int numvnd = 0;
#define VNDLABELDEV(dev) \
(MAKEDISKDEV(major((dev)), vndunit((dev)), RAW_PART))
/* called by main() at boot time (XXX: and the LKM driver) */
void vndattach __P((int));
int vnddetach __P((void));
void vndclear __P((struct vnd_softc *, int));
void vndstart __P((struct vnd_softc *));
int vndsetcred __P((struct vnd_softc *, struct ucred *));
void vndthrottle __P((struct vnd_softc *, struct vnode *));
void vndiodone __P((struct buf *));
#if 0
void vndshutdown __P((void));
#endif
void vndgetdefaultlabel __P((struct vnd_softc *, struct disklabel *));
void vndgetdisklabel __P((dev_t));
static int vndlock __P((struct vnd_softc *));
static void vndunlock __P((struct vnd_softc *));
dev_type_open(vndopen);
dev_type_close(vndclose);
dev_type_read(vndread);
dev_type_write(vndwrite);
dev_type_ioctl(vndioctl);
dev_type_strategy(vndstrategy);
dev_type_dump(vnddump);
dev_type_size(vndsize);
const struct bdevsw vnd_bdevsw = {
vndopen, vndclose, vndstrategy, vndioctl, vnddump, vndsize, D_DISK
};
const struct cdevsw vnd_cdevsw = {
vndopen, vndclose, vndread, vndwrite, vndioctl,
nostop, notty, nopoll, nommap, nokqfilter, D_DISK
};
int vndattached = 0;
void
vndattach(num)
int num;
{
int i;
char *mem;
if (vndattached)
return;
vndattached = 1;
if (num <= 0)
return;
i = num * sizeof(struct vnd_softc);
mem = malloc(i, M_DEVBUF, M_NOWAIT|M_ZERO);
if (mem == NULL) {
printf("WARNING: no memory for vnode disks\n");
return;
}
vnd_softc = (struct vnd_softc *)mem;
numvnd = num;
for (i = 0; i < numvnd; i++) {
vnd_softc[i].sc_unit = i;
bufq_alloc(&vnd_softc[i].sc_tab,
BUFQ_DISKSORT|BUFQ_SORT_RAWBLOCK);
}
}
int
vnddetach()
{
int i;
/* First check we aren't in use. */
for (i = 0; i < numvnd; i++)
if (vnd_softc[i].sc_flags & VNF_INITED)
return (EBUSY);
for (i = 0; i < numvnd; i++)
bufq_free(&vnd_softc[i].sc_tab);
free(vnd_softc, M_DEVBUF);
vndattached = 0;
return (0);
}
int
vndopen(dev, flags, mode, p)
dev_t dev;
int flags, mode;
struct proc *p;
{
int unit = vndunit(dev);
struct vnd_softc *sc;
int error = 0, part, pmask;
struct disklabel *lp;
#ifdef DEBUG
if (vnddebug & VDB_FOLLOW)
printf("vndopen(0x%x, 0x%x, 0x%x, %p)\n", dev, flags, mode, p);
#endif
if (unit >= numvnd)
return (ENXIO);
sc = &vnd_softc[unit];
if ((error = vndlock(sc)) != 0)
return (error);
lp = sc->sc_dkdev.dk_label;
part = DISKPART(dev);
pmask = (1 << part);
/*
* If we're initialized, check to see if there are any other
* open partitions. If not, then it's safe to update the
* in-core disklabel. Only read the disklabel if it is
* not realdy valid.
*/
if ((sc->sc_flags & (VNF_INITED|VNF_VLABEL)) == VNF_INITED &&
sc->sc_dkdev.dk_openmask == 0)
vndgetdisklabel(dev);
/* Check that the partitions exists. */
if (part != RAW_PART) {
if (((sc->sc_flags & VNF_INITED) == 0) ||
((part >= lp->d_npartitions) ||
(lp->d_partitions[part].p_fstype == FS_UNUSED))) {
error = ENXIO;
goto done;
}
}
/* Prevent our unit from being unconfigured while open. */
switch (mode) {
case S_IFCHR:
sc->sc_dkdev.dk_copenmask |= pmask;
break;
case S_IFBLK:
sc->sc_dkdev.dk_bopenmask |= pmask;
break;
}
sc->sc_dkdev.dk_openmask =
sc->sc_dkdev.dk_copenmask | sc->sc_dkdev.dk_bopenmask;
done:
vndunlock(sc);
return (error);
}
int
vndclose(dev, flags, mode, p)
dev_t dev;
int flags, mode;
struct proc *p;
{
int unit = vndunit(dev);
struct vnd_softc *sc;
int error = 0, part;
#ifdef DEBUG
if (vnddebug & VDB_FOLLOW)
printf("vndclose(0x%x, 0x%x, 0x%x, %p)\n", dev, flags, mode, p);
#endif
if (unit >= numvnd)
return (ENXIO);
sc = &vnd_softc[unit];
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;
if (sc->sc_dkdev.dk_openmask == 0) {
if ((sc->sc_flags & VNF_KLABEL) == 0)
sc->sc_flags &= ~VNF_VLABEL;
}
vndunlock(sc);
return (0);
}
/*
* Break the request into bsize pieces and submit using VOP_BMAP/VOP_STRATEGY.
*/
void
vndstrategy(bp)
struct buf *bp;
{
int unit = vndunit(bp->b_dev);
struct vnd_softc *vnd = &vnd_softc[unit];
struct vndxfer *vnx;
struct mount *mp;
int s, bsize, resid;
off_t bn;
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(&vnd->sc_dkdev, bp, wlabel) <= 0)
goto done;
/*
* check if we're read-only.
*/
if ((vnd->sc_flags & VNF_READONLY) && !(bp->b_flags & B_READ)) {
bp->b_error = EACCES;
bp->b_flags |= B_ERROR;
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;
if (vnd->sc_vp->v_mount == NULL) {
bp->b_error = ENXIO;
bp->b_flags |= B_ERROR;
goto done;
}
bsize = vnd->sc_vp->v_mount->mnt_stat.f_iosize;
addr = bp->b_data;
flags = (bp->b_flags & (B_READ|B_ASYNC)) | B_CALL;
/* Allocate a header for this transfer and link it to the buffer */
s = splbio();
vnx = VND_GETXFER(vnd);
splx(s);
vnx->vx_flags = VX_BUSY;
vnx->vx_error = 0;
vnx->vx_pending = 0;
vnx->vx_bp = bp;
if ((flags & B_READ) == 0)
vn_start_write(vnd->sc_vp, &mp, V_WAIT);
for (resid = bp->b_resid; resid; resid -= sz) {
struct vndbuf *nbp;
struct vnode *vp;
daddr_t nbn;
int off, nra;
nra = 0;
vn_lock(vnd->sc_vp, LK_EXCLUSIVE | LK_RETRY | LK_CANRECURSE);
error = VOP_BMAP(vnd->sc_vp, bn / bsize, &vp, &nbn, &nra);
VOP_UNLOCK(vnd->sc_vp, 0);
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%qx/0x%" PRIx64
" sz 0x%x\n",
vnd->sc_vp, vp, (long long)bn, nbn, sz);
#endif
s = splbio();
nbp = VND_GETBUF(vnd);
splx(s);
BUF_INIT(&nbp->vb_buf);
nbp->vb_buf.b_flags = flags;
nbp->vb_buf.b_bcount = sz;
nbp->vb_buf.b_bufsize = round_page((ulong)addr + sz)
- trunc_page((ulong) addr);
nbp->vb_buf.b_error = 0;
nbp->vb_buf.b_data = addr;
nbp->vb_buf.b_blkno = nbp->vb_buf.b_rawblkno = 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_xfer = vnx;
/*
* Just sort by block number
*/
s = splbio();
if (vnx->vx_error != 0) {
VND_PUTBUF(vnd, nbp);
goto out;
}
vnx->vx_pending++;
bgetvp(vp, &nbp->vb_buf);
BUFQ_PUT(&vnd->sc_tab, &nbp->vb_buf);
vndstart(vnd);
splx(s);
bn += sz;
addr += sz;
}
s = splbio();
out: /* Arrive here at splbio */
if ((flags & B_READ) == 0)
vn_finished_write(mp, 0);
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;
}
VND_PUTXFER(vnd, 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)
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_active < vnd->sc_maxactive) {
bp = BUFQ_GET(&vnd->sc_tab);
if (bp == NULL)
break;
vnd->sc_active++;
#ifdef DEBUG
if (vnddebug & VDB_IO)
printf("vndstart(%ld): bp %p vp %p blkno 0x%" PRIx64
" flags %lx addr %p cnt 0x%lx\n",
(long) (vnd-vnd_softc), bp, bp->b_vp, bp->b_blkno,
bp->b_flags, 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;
{
struct vndbuf *vbp = (struct vndbuf *) bp;
struct vndxfer *vnx = (struct vndxfer *)vbp->vb_xfer;
struct buf *pbp = vnx->vx_bp;
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%" PRIx64
" 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, (pbp->b_flags & B_READ));
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);
VND_PUTBUF(vnd, 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
VND_PUTXFER(vnd, 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
VND_PUTXFER(vnd, vnx);
biodone(pbp);
}
}
vnd->sc_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);
struct vnd_softc *vnd;
struct vnd_ioctl *vio;
struct vattr vattr;
struct nameidata nd;
int error, part, pmask;
size_t geomsize;
int fflags;
#ifdef __HAVE_OLD_DISKLABEL
struct disklabel newlabel;
#endif
#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
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:
#ifdef __HAVE_OLD_DISKLABEL
case ODIOCSDINFO:
case ODIOCWDINFO:
#endif
case DIOCKLABEL:
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 DIOCKLABEL:
case DIOCWLABEL:
case DIOCGDEFLABEL:
#ifdef __HAVE_OLD_DISKLABEL
case ODIOCGDINFO:
case ODIOCSDINFO:
case ODIOCWDINFO:
case ODIOCGDEFLABEL:
#endif
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);
fflags = FREAD;
if ((vio->vnd_flags & VNDIOF_READONLY) == 0)
fflags |= FWRITE;
NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, vio->vnd_file, p);
if ((error = vn_open(&nd, fflags, 0)) != 0)
goto unlock_and_exit;
error = VOP_GETATTR(nd.ni_vp, &vattr, p->p_ucred, p);
VOP_UNLOCK(nd.ni_vp, 0);
if (!error && nd.ni_vp->v_type != VREG)
error = EOPNOTSUPP;
if (error)
goto close_and_exit;
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) {
memcpy(&vnd->sc_geom, &vio->vnd_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 ||
vnd->sc_geom.vng_ncylinders == 0 ||
(vnd->sc_geom.vng_ntracks *
vnd->sc_geom.vng_nsectors) == 0) {
error = EINVAL;
goto close_and_exit;
}
/*
* 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) {
error = EINVAL;
goto close_and_exit;
}
} else {
/*
* Size must be at least 2048 DEV_BSIZE blocks
* (1M) in order to use this geometry.
*/
if (vnd->sc_size < (32 * 64)) {
error = EINVAL;
goto close_and_exit;
}
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);
}
if (vio->vnd_flags & VNDIOF_READONLY) {
vnd->sc_flags |= VNF_READONLY;
}
if ((error = vndsetcred(vnd, p->p_ucred)) != 0)
goto close_and_exit;
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. */
memset(vnd->sc_xname, 0, 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);
/* Initialize the xfer and buffer pools. */
pool_init(&vnd->sc_vxpool, sizeof(struct vndxfer), 0,
0, 0, "vndxpl", NULL);
pool_init(&vnd->sc_vbpool, sizeof(struct vndbuf), 0,
0, 0, "vndbpl", NULL);
/* Try and read the disklabel. */
vndgetdisklabel(dev);
vndunlock(vnd);
break;
close_and_exit:
(void) vn_close(nd.ni_vp, fflags, p->p_ucred, p);
unlock_and_exit:
vndunlock(vnd);
return (error);
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))) &&
!(vio->vnd_flags & VNDIOF_FORCE)) {
vndunlock(vnd);
return (EBUSY);
}
/*
* XXX vndclear() might call vndclose() implicitely;
* release lock to avoid recursion
*/
vndunlock(vnd);
vndclear(vnd, minor(dev));
#ifdef DEBUG
if (vnddebug & VDB_INIT)
printf("vndioctl: CLRed\n");
#endif
/* Destroy the xfer and buffer pools. */
pool_destroy(&vnd->sc_vxpool);
pool_destroy(&vnd->sc_vbpool);
/* Detatch the disk. */
disk_detach(&vnd->sc_dkdev);
break;
case VNDIOCGET: {
struct vnd_user *vnu;
struct vattr va;
vnu = (struct vnd_user *)data;
if (vnu->vnu_unit == -1)
vnu->vnu_unit = unit;
if (vnu->vnu_unit >= numvnd)
return (ENXIO);
if (vnu->vnu_unit < 0)
return (EINVAL);
vnd = &vnd_softc[vnu->vnu_unit];
if (vnd->sc_flags & VNF_INITED) {
error = VOP_GETATTR(vnd->sc_vp, &va, p->p_ucred, p);
if (error)
return (error);
vnu->vnu_dev = va.va_fsid;
vnu->vnu_ino = va.va_fileid;
}
else {
/* unused is not an error */
vnu->vnu_dev = 0;
vnu->vnu_ino = 0;
}
break;
}
case DIOCGDINFO:
*(struct disklabel *)data = *(vnd->sc_dkdev.dk_label);
break;
#ifdef __HAVE_OLD_DISKLABEL
case ODIOCGDINFO:
newlabel = *(vnd->sc_dkdev.dk_label);
if (newlabel.d_npartitions > OLDMAXPARTITIONS)
return ENOTTY;
memcpy(data, &newlabel, sizeof (struct olddisklabel));
break;
#endif
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:
#ifdef __HAVE_OLD_DISKLABEL
case ODIOCWDINFO:
case ODIOCSDINFO:
#endif
{
struct disklabel *lp;
if ((error = vndlock(vnd)) != 0)
return (error);
vnd->sc_flags |= VNF_LABELLING;
#ifdef __HAVE_OLD_DISKLABEL
if (cmd == ODIOCSDINFO || cmd == ODIOCWDINFO) {
memset(&newlabel, 0, sizeof newlabel);
memcpy(&newlabel, data, sizeof (struct olddisklabel));
lp = &newlabel;
} else
#endif
lp = (struct disklabel *)data;
error = setdisklabel(vnd->sc_dkdev.dk_label,
lp, 0, vnd->sc_dkdev.dk_cpulabel);
if (error == 0) {
if (cmd == DIOCWDINFO
#ifdef __HAVE_OLD_DISKLABEL
|| cmd == ODIOCWDINFO
#endif
)
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 DIOCKLABEL:
if (*(int *)data != 0)
vnd->sc_flags |= VNF_KLABEL;
else
vnd->sc_flags &= ~VNF_KLABEL;
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;
#ifdef __HAVE_OLD_DISKLABEL
case ODIOCGDEFLABEL:
vndgetdefaultlabel(vnd, &newlabel);
if (newlabel.d_npartitions > OLDMAXPARTITIONS)
return ENOTTY;
memcpy(data, &newlabel, sizeof (struct olddisklabel));
break;
#endif
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)
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;
vn_lock(vnd->sc_vp, LK_EXCLUSIVE | LK_RETRY);
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 (at least) 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, 0);
free(tmpbuf, M_TEMP);
return (error);
}
/*
* Set maxactive based on FS type
*/
void
vndthrottle(vnd, vp)
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;
}
#if 0
void
vndshutdown()
{
struct vnd_softc *vnd;
for (vnd = &vnd_softc[0]; vnd < &vnd_softc[numvnd]; vnd++)
if (vnd->sc_flags & VNF_INITED)
vndclear(vnd);
}
#endif
void
vndclear(vnd, myminor)
struct vnd_softc *vnd;
int myminor;
{
struct vnode *vp = vnd->sc_vp;
struct proc *p = curproc; /* XXX */
int fflags = FREAD;
int bmaj, cmaj, i, mn;
#ifdef DEBUG
if (vnddebug & VDB_FOLLOW)
printf("vndclear(%p): vp %p\n", vnd, vp);
#endif
/* locate the major number */
bmaj = bdevsw_lookup_major(&vnd_bdevsw);
cmaj = cdevsw_lookup_major(&vnd_cdevsw);
/* Nuke the vnodes for any open instances */
for (i = 0; i < MAXPARTITIONS; i++) {
mn = DISKMINOR(vnd->sc_unit, i);
vdevgone(bmaj, mn, mn, VBLK);
if (mn != myminor) /* XXX avoid to kill own vnode */
vdevgone(cmaj, mn, mn, VCHR);
}
if ((vnd->sc_flags & VNF_READONLY) == 0)
fflags |= FWRITE;
vnd->sc_flags &= ~(VNF_INITED | VNF_READONLY | VNF_VLABEL);
if (vp == (struct vnode *)0)
panic("vndioctl: null vp");
(void) vn_close(vp, fflags, 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;
memset(lp, 0, 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)];
const char *errstring;
struct disklabel *lp = sc->sc_dkdev.dk_label;
struct cpu_disklabel *clp = sc->sc_dkdev.dk_cpulabel;
int i;
memset(clp, 0, 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_size != 0)
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_npartitions = MAXPARTITIONS;
lp->d_checksum = dkcksum(lp);
}
/* In-core label now valid. */
sc->sc_flags |= VNF_VLABEL;
}
/*
* 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);
}
}
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