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NetBSD/sys/dev/vnd.c

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/* $NetBSD: vnd.c,v 1.41 1997/06/23 21:03:55 thorpej Exp $ */
/*-
* Copyright (c) 1996, 1997 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 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.
*/
/*
* Copyright (c) 1988 University of Utah.
* 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. 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 8.6 (Berkeley) 4/1/94
*/
/*
* 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/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 b_cylin b_resid
#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 */
};
struct vndbuf {
struct buf vb_buf;
struct vndxfer *vb_xfer;
};
#define getvndxfer() \
((struct vndxfer *)malloc(sizeof(struct vndxfer), M_DEVBUF, M_WAITOK))
#define putvndxfer(vnx) \
free((caddr_t)(vnx), M_DEVBUF)
#define getvndbuf() \
((struct vndbuf *)malloc(sizeof(struct vndbuf), M_DEVBUF, M_WAITOK))
#define putvndbuf(vbp) \
free((caddr_t)(vbp), M_DEVBUF)
struct vnd_softc *vnd_softc;
int numvnd = 0;
#define VNDLABELDEV(dev) \
(MAKEDISKDEV(major((dev)), vndunit((dev)), RAW_PART))
/* called by main() at boot time */
void vndattach __P((int));
void vndclear __P((struct vnd_softc *));
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 *));
void vndshutdown __P((void));
void vndgetdisklabel __P((dev_t));
static int vndlock __P((struct vnd_softc *));
static void vndunlock __P((struct vnd_softc *));
void
vndattach(num)
int num;
{
char *mem;
register u_long size;
if (num <= 0)
return;
size = num * sizeof(struct vnd_softc);
mem = malloc(size, M_DEVBUF, M_NOWAIT);
if (mem == NULL) {
printf("WARNING: no memory for vnode disks\n");
return;
}
bzero(mem, size);
vnd_softc = (struct vnd_softc *)mem;
numvnd = num;
}
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(%x, %x, %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.
*/
if ((sc->sc_flags & 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(%x, %x, %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;
vndunlock(sc);
return (0);
}
/*
* Break the request into bsize pieces and submit using VOP_BMAP/VOP_STRATEGY.
* Note that this driver can only be used for swapping over NFS on the hp
* since nfs_strategy on the vax cannot handle u-areas and page tables.
*/
void
vndstrategy(bp)
register struct buf *bp;
{
int unit = vndunit(bp->b_dev);
struct vnd_softc *vnd = &vnd_softc[unit];
struct vndbuf *nbp;
struct vndxfer *vnx;
int 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_error = 0;
vnx->vx_pending = 0;
vnx->vx_bp = bp;
for (resid = bp->b_resid; resid; resid -= sz) {
struct vnode *vp;
daddr_t nbn;
int off, s, nra;
nra = 0;
VOP_LOCK(vnd->sc_vp);
error = VOP_BMAP(vnd->sc_vp, bn / bsize, &vp, &nbn, &nra);
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) {
vnx->vx_error = error;
s = splbio();
if (vnx->vx_pending == 0) {
bp->b_error = error;
bp->b_flags |= B_ERROR;
putvndxfer(vnx);
goto done;
}
splx(s);
return;
}
#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 %x/%x sz %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;
if (vp->v_type == VBLK || vp->v_type == VCHR)
nbp->vb_buf.b_dev = vp->v_rdev;
else
nbp->vb_buf.b_dev = NODEV;
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 = vp;
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();
vnx->vx_pending++;
disksort(&vnd->sc_tab, &nbp->vb_buf);
if (vnd->sc_tab.b_active < vnd->sc_maxactive) {
vnd->sc_tab.b_active++;
vndstart(vnd);
}
splx(s);
bn += sz;
addr += sz;
}
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;
{
register struct buf *bp;
/*
* Dequeue now since lower level strategy routine might
* queue using same links
*/
bp = vnd->sc_tab.b_actf;
vnd->sc_tab.b_actf = bp->b_actf;
#ifdef DEBUG
if (vnddebug & VDB_IO)
printf("vndstart(%ld): bp %p vp %p blkno %x addr %p cnt %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);
}
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 %x addr %p cnt %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;
}
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 (pbp->b_resid == 0 || (vnx->vx_error && vnx->vx_pending == 0)) {
if (vnx->vx_error != 0) {
pbp->b_flags |= B_ERROR;
pbp->b_error = vnx->vx_error;
}
putvndxfer(vnx);
#ifdef DEBUG
if (vnddebug & VDB_IO)
printf("vndiodone: pbp %p iodone\n", pbp);
#endif
biodone(pbp);
}
if (vnd->sc_tab.b_actf)
vndstart(vnd);
else
vnd->sc_tab.b_active--;
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(%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(%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(%x, %lx, %p, %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;
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))
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 %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 ((vnd->sc_flags & VNF_INITED) == 0)
return (ENXIO);
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:
if ((vnd->sc_flags & VNF_INITED) == 0)
return (ENXIO);
*(struct disklabel *)data = *(vnd->sc_dkdev.dk_label);
break;
case DIOCGPART:
if ((vnd->sc_flags & VNF_INITED) == 0)
return (ENXIO);
((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 ((vnd->sc_flags & VNF_INITED) == 0)
return (ENXIO);
if ((flag & FWRITE) == 0)
return (EBADF);
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 ((vnd->sc_flags & VNF_INITED) == 0)
return (ENXIO);
if ((flag & FWRITE) == 0)
return (EBADF);
if (*(int *)data != 0)
vnd->sc_flags |= VNF_WLABEL;
else
vnd->sc_flags &= ~VNF_WLABEL;
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);
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;
}
/*
* 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;
struct vndgeom *vng = &sc->sc_geom;
struct partition *pp;
int i;
bzero(lp, sizeof(*lp));
bzero(clp, sizeof(*clp));
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);
/*
* 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++) {
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));
}
}
/*
* 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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