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NetBSD/sys/dev/vnd.c

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/* $NetBSD: vnd.c,v 1.140 2006/02/04 13:40:38 yamt 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 1.140 2006/02/04 13:40:38 yamt Exp $");
#if defined(_KERNEL_OPT)
#include "fs_nfs.h"
#include "opt_vnd.h"
#endif
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/namei.h>
#include <sys/proc.h>
#include <sys/kthread.h>
#include <sys/errno.h>
#include <sys/buf.h>
#include <sys/bufq.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 <net/zlib.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_buf;
struct vnd_softc *vx_vnd;
};
#define VND_BUFTOXFER(bp) ((struct vndxfer *)(void *)bp)
#define VND_GETXFER(vnd) pool_get(&(vnd)->sc_vxpool, PR_WAITOK)
#define VND_PUTXFER(vnd, vx) pool_put(&(vnd)->sc_vxpool, (vx))
#define VNDLABELDEV(dev) \
(MAKEDISKDEV(major((dev)), vndunit((dev)), RAW_PART))
/* called by main() at boot time (XXX: and the LKM driver) */
void vndattach(int);
static void vndclear(struct vnd_softc *, int);
static int vndsetcred(struct vnd_softc *, struct ucred *);
static void vndthrottle(struct vnd_softc *, struct vnode *);
static void vndiodone(struct buf *);
#if 0
static void vndshutdown(void);
#endif
static void vndgetdefaultlabel(struct vnd_softc *, struct disklabel *);
static void vndgetdisklabel(dev_t, struct vnd_softc *);
static int vndlock(struct vnd_softc *);
static void vndunlock(struct vnd_softc *);
#ifdef VND_COMPRESSION
static void compstrategy(struct buf *, off_t);
static void *vnd_alloc(void *, u_int, u_int);
static void vnd_free(void *, void *);
#endif /* VND_COMPRESSION */
static void vndthread(void *);
static dev_type_open(vndopen);
static dev_type_close(vndclose);
static dev_type_read(vndread);
static dev_type_write(vndwrite);
static dev_type_ioctl(vndioctl);
static dev_type_strategy(vndstrategy);
static dev_type_dump(vnddump);
static 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
};
static int vnd_match(struct device *, struct cfdata *, void *);
static void vnd_attach(struct device *, struct device *, void *);
static int vnd_detach(struct device *, int);
CFATTACH_DECL(vnd, sizeof(struct vnd_softc),
vnd_match, vnd_attach, vnd_detach, NULL);
extern struct cfdriver vnd_cd;
static struct vnd_softc *vnd_spawn(int);
int vnd_destroy(struct device *);
void
vndattach(int num)
{
int error;
error = config_cfattach_attach(vnd_cd.cd_name, &vnd_ca);
if (error)
aprint_error("%s: unable to register cfattach\n",
vnd_cd.cd_name);
}
static int
vnd_match(struct device *self, struct cfdata *cfdata, void *aux)
{
return 1;
}
static void
vnd_attach(struct device *parent, struct device *self, void *aux)
{
struct vnd_softc *sc = (struct vnd_softc *)self;
sc->sc_comp_offsets = NULL;
sc->sc_comp_buff = NULL;
sc->sc_comp_decombuf = NULL;
bufq_alloc(&sc->sc_tab, "disksort", BUFQ_SORT_RAWBLOCK);
pseudo_disk_init(&sc->sc_dkdev);
aprint_normal("%s: vnode disk driver\n", self->dv_xname);
}
static int
vnd_detach(struct device *self, int flags)
{
struct vnd_softc *sc = (struct vnd_softc *)self;
if (sc->sc_flags & VNF_INITED)
return EBUSY;
bufq_free(sc->sc_tab);
return 0;
}
static struct vnd_softc *
vnd_spawn(int unit)
{
struct cfdata *cf;
cf = malloc(sizeof(*cf), M_DEVBUF, M_WAITOK);
cf->cf_name = vnd_cd.cd_name;
cf->cf_atname = vnd_cd.cd_name;
cf->cf_unit = unit;
cf->cf_fstate = FSTATE_STAR;
return (struct vnd_softc *)config_attach_pseudo(cf);
}
int
vnd_destroy(struct device *dev)
{
int error;
struct cfdata *cf;
cf = dev->dv_cfdata;
error = config_detach(dev, 0);
if (error)
return error;
free(cf, M_DEVBUF);
return 0;
}
static int
vndopen(dev_t dev, int flags, int mode, struct lwp *l)
{
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, l);
#endif
sc = device_lookup(&vnd_cd, unit);
if (sc == NULL) {
sc = vnd_spawn(unit);
if (sc == NULL)
return ENOMEM;
}
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 already valid.
*/
if ((sc->sc_flags & (VNF_INITED|VNF_VLABEL)) == VNF_INITED &&
sc->sc_dkdev.dk_openmask == 0)
vndgetdisklabel(dev, sc);
/* 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);
}
static int
vndclose(dev_t dev, int flags, int mode, struct lwp *l)
{
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, l);
#endif
sc = device_lookup(&vnd_cd, unit);
if (sc == NULL)
return ENXIO;
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);
if ((sc->sc_flags & VNF_INITED) == 0) {
if ((error = vnd_destroy((struct device *)sc)) != 0) {
aprint_error("%s: unable to detach instance\n",
sc->sc_dev.dv_xname);
return error;
}
}
return (0);
}
/*
* Queue the request, and wakeup the kernel thread to handle it.
*/
static void
vndstrategy(struct buf *bp)
{
int unit = vndunit(bp->b_dev);
struct vnd_softc *vnd =
(struct vnd_softc *)device_lookup(&vnd_cd, unit);
struct disklabel *lp = vnd->sc_dkdev.dk_label;
daddr_t blkno;
int s = splbio();
bp->b_resid = bp->b_bcount;
if ((vnd->sc_flags & VNF_INITED) == 0) {
bp->b_error = ENXIO;
bp->b_flags |= B_ERROR;
goto done;
}
/*
* 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;
}
/*
* 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;
}
/*
* Do bounds checking and adjust transfer. If there's an error,
* the bounds check will flag that for us.
*/
if (DISKPART(bp->b_dev) == RAW_PART) {
if (bounds_check_with_mediasize(bp, DEV_BSIZE,
vnd->sc_size) <= 0)
goto done;
} else {
if (bounds_check_with_label(&vnd->sc_dkdev,
bp, vnd->sc_flags & (VNF_WLABEL|VNF_LABELLING)) <= 0)
goto done;
}
/* If it's a nil transfer, wake up the top half now. */
if (bp->b_bcount == 0)
goto done;
/*
* Put the block number in terms of the logical blocksize
* of the "device".
*/
blkno = bp->b_blkno / (lp->d_secsize / DEV_BSIZE);
/*
* Translate the partition-relative block number to an absolute.
*/
if (DISKPART(bp->b_dev) != RAW_PART) {
struct partition *pp;
pp = &vnd->sc_dkdev.dk_label->d_partitions[
DISKPART(bp->b_dev)];
blkno += pp->p_offset;
}
bp->b_rawblkno = blkno;
#ifdef DEBUG
if (vnddebug & VDB_FOLLOW)
printf("vndstrategy(%p): unit %d\n", bp, unit);
#endif
BUFQ_PUT(vnd->sc_tab, bp);
wakeup(&vnd->sc_tab);
splx(s);
return;
done:
biodone(bp);
splx(s);
}
static void
vndthread(void *arg)
{
struct vnd_softc *vnd = arg;
struct mount *mp;
int s, bsize;
int sz, error;
struct disklabel *lp;
s = splbio();
vnd->sc_flags |= VNF_KTHREAD;
wakeup(&vnd->sc_kthread);
/*
* Dequeue requests, break them into bsize pieces and submit using
* VOP_BMAP/VOP_STRATEGY.
*/
while ((vnd->sc_flags & VNF_VUNCONF) == 0) {
struct vndxfer *vnx;
off_t offset;
int resid;
int skipped = 0;
off_t bn;
int flags;
struct buf *obp;
struct buf *bp;
obp = BUFQ_GET(vnd->sc_tab);
if (obp == NULL) {
tsleep(&vnd->sc_tab, PRIBIO, "vndbp", 0);
continue;
};
splx(s);
flags = obp->b_flags;
#ifdef DEBUG
if (vnddebug & VDB_FOLLOW)
printf("vndthread(%p\n", obp);
#endif
lp = vnd->sc_dkdev.dk_label;
/* convert to a byte offset within the file. */
bn = obp->b_rawblkno * lp->d_secsize;
if (vnd->sc_vp->v_mount == NULL) {
obp->b_error = ENXIO;
obp->b_flags |= B_ERROR;
goto done;
}
#ifdef VND_COMPRESSION
/* handle a compressed read */
if ((flags & B_READ) != 0 && (vnd->sc_flags & VNF_COMP)) {
compstrategy(obp, bn);
goto done;
}
#endif /* VND_COMPRESSION */
bsize = vnd->sc_vp->v_mount->mnt_stat.f_iosize;
/*
* Allocate a header for this transfer and link it to the
* buffer
*/
s = splbio();
vnx = VND_GETXFER(vnd);
splx(s);
vnx->vx_vnd = vnd;
bp = &vnx->vx_buf;
BUF_INIT(bp);
bp->b_flags = (obp->b_flags & B_READ) | B_CALL;
bp->b_iodone = vndiodone;
bp->b_private = obp;
bp->b_vp = vnd->sc_vp;
bp->b_data = obp->b_data;
bp->b_bcount = bp->b_resid = obp->b_bcount;
BIO_COPYPRIO(bp, obp);
s = splbio();
while (vnd->sc_active >= vnd->sc_maxactive) {
tsleep(&vnd->sc_tab, PRIBIO, "vndac", 0);
}
vnd->sc_active++;
splx(s);
if ((flags & B_READ) == 0) {
s = splbio();
V_INCR_NUMOUTPUT(bp->b_vp);
splx(s);
vn_start_write(vnd->sc_vp, &mp, V_WAIT);
}
/* Instrumentation. */
disk_busy(&vnd->sc_dkdev);
/*
* 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.
*/
error = 0;
for (offset = 0, resid = bp->b_resid; resid;
resid -= sz, offset += sz) {
struct buf *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) {
skipped += resid;
break;
}
#ifdef DEBUG
if (!dovndcluster)
nra = 0;
#endif
off = bn % bsize;
sz = MIN(((off_t)1 + nra) * bsize - off, 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
nbp = getiobuf();
nestiobuf_setup(bp, nbp, offset, sz);
nbp->b_blkno = nbn + btodb(off);
#if 0 /* XXX #ifdef DEBUG */
if (vnddebug & VDB_IO)
printf("vndstart(%ld): bp %p vp %p blkno "
"0x%" PRIx64 " flags %x addr %p cnt 0x%x\n",
(long) (vnd-vnd_softc), &nbp->vb_buf,
nbp->vb_buf.b_vp, nbp->vb_buf.b_blkno,
nbp->vb_buf.b_flags, nbp->vb_buf.b_data,
nbp->vb_buf.b_bcount);
#endif
VOP_STRATEGY(vp, nbp);
bn += sz;
}
nestiobuf_done(bp, skipped, error);
if ((flags & B_READ) == 0)
vn_finished_write(mp, 0);
s = splbio();
continue;
done:
biodone(obp);
s = splbio();
}
vnd->sc_flags &= (~VNF_KTHREAD | VNF_VUNCONF);
wakeup(&vnd->sc_kthread);
splx(s);
kthread_exit(0);
}
static void
vndiodone(struct buf *bp)
{
struct vndxfer *vnx = VND_BUFTOXFER(bp);
struct vnd_softc *vnd = vnx->vx_vnd;
struct buf *obp = bp->b_private;
KASSERT(&vnx->vx_buf == bp);
KASSERT(vnd->sc_active > 0);
#ifdef DEBUG
if (vnddebug & VDB_IO) {
printf("vndiodone1: bp %p iodone: error %d\n",
bp, (bp->b_flags & B_ERROR) != 0 ? bp->b_error : 0);
}
#endif
disk_unbusy(&vnd->sc_dkdev, bp->b_bcount - bp->b_resid,
(bp->b_flags & B_READ));
vnd->sc_active--;
if (vnd->sc_active == 0) {
wakeup(&vnd->sc_tab);
}
obp->b_flags |= bp->b_flags & B_ERROR;
obp->b_error = bp->b_error;
obp->b_resid = bp->b_resid;
VND_PUTXFER(vnd, vnx);
biodone(obp);
}
/* ARGSUSED */
static int
vndread(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
sc = device_lookup(&vnd_cd, unit);
if (sc == NULL)
return ENXIO;
if ((sc->sc_flags & VNF_INITED) == 0)
return (ENXIO);
return (physio(vndstrategy, NULL, dev, B_READ, minphys, uio));
}
/* ARGSUSED */
static int
vndwrite(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
sc = device_lookup(&vnd_cd, unit);
if (sc == NULL)
return ENXIO;
if ((sc->sc_flags & VNF_INITED) == 0)
return (ENXIO);
return (physio(vndstrategy, NULL, dev, B_WRITE, minphys, uio));
}
static int
vnd_cget(struct lwp *l, int unit, int *un, struct vattr *va)
{
struct vnd_softc *vnd;
if (*un == -1)
*un = unit;
if (*un < 0)
return EINVAL;
vnd = device_lookup(&vnd_cd, *un);
if (vnd == NULL)
return (*un >= vnd_cd.cd_ndevs) ? ENXIO : -1;
if ((vnd->sc_flags & VNF_INITED) == 0)
return -1;
return VOP_GETATTR(vnd->sc_vp, va, l->l_proc->p_ucred, l);
}
/* ARGSUSED */
static int
vndioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct lwp *l)
{
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;
struct proc *p = (l != NULL) ? l->l_proc : NULL;
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
vnd = device_lookup(&vnd_cd, unit);
if (vnd == NULL &&
#ifdef COMPAT_30
cmd != VNDIOOCGET &&
#endif
cmd != VNDIOCGET)
return ENXIO;
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, l);
if ((error = vn_open(&nd, fflags, 0)) != 0)
goto unlock_and_exit;
error = VOP_GETATTR(nd.ni_vp, &vattr, l->l_proc->p_ucred, l);
if (!error && nd.ni_vp->v_type != VREG)
error = EOPNOTSUPP;
if (error) {
VOP_UNLOCK(nd.ni_vp, 0);
goto close_and_exit;
}
/* If using a compressed file, initialize its info */
/* (or abort with an error if kernel has no compression) */
if (vio->vnd_flags & VNF_COMP) {
#ifdef VND_COMPRESSION
struct vnd_comp_header *ch;
int i;
u_int32_t comp_size;
u_int32_t comp_maxsize;
/* allocate space for compresed file header */
ch = malloc(sizeof(struct vnd_comp_header),
M_TEMP, M_WAITOK);
/* read compressed file header */
error = vn_rdwr(UIO_READ, nd.ni_vp, (caddr_t)ch,
sizeof(struct vnd_comp_header), 0, UIO_SYSSPACE,
IO_UNIT|IO_NODELOCKED, p->p_ucred, NULL, NULL);
if(error) {
free(ch, M_TEMP);
VOP_UNLOCK(nd.ni_vp, 0);
goto close_and_exit;
}
/* save some header info */
vnd->sc_comp_blksz = ntohl(ch->block_size);
/* note last offset is the file byte size */
vnd->sc_comp_numoffs = ntohl(ch->num_blocks)+1;
free(ch, M_TEMP);
if(vnd->sc_comp_blksz % DEV_BSIZE !=0) {
VOP_UNLOCK(nd.ni_vp, 0);
error = EINVAL;
goto close_and_exit;
}
if(sizeof(struct vnd_comp_header) +
sizeof(u_int64_t) * vnd->sc_comp_numoffs >
vattr.va_size) {
VOP_UNLOCK(nd.ni_vp, 0);
error = EINVAL;
goto close_and_exit;
}
/* set decompressed file size */
vattr.va_size =
(vnd->sc_comp_numoffs - 1) * vnd->sc_comp_blksz;
/* allocate space for all the compressed offsets */
vnd->sc_comp_offsets =
malloc(sizeof(u_int64_t) * vnd->sc_comp_numoffs,
M_DEVBUF, M_WAITOK);
/* read in the offsets */
error = vn_rdwr(UIO_READ, nd.ni_vp,
(caddr_t)vnd->sc_comp_offsets,
sizeof(u_int64_t) * vnd->sc_comp_numoffs,
sizeof(struct vnd_comp_header), UIO_SYSSPACE,
IO_UNIT|IO_NODELOCKED, p->p_ucred, NULL, NULL);
if(error) {
VOP_UNLOCK(nd.ni_vp, 0);
goto close_and_exit;
}
/*
* find largest block size (used for allocation limit).
* Also convert offset to native byte order.
*/
comp_maxsize = 0;
for (i = 0; i < vnd->sc_comp_numoffs - 1; i++) {
vnd->sc_comp_offsets[i] =
be64toh(vnd->sc_comp_offsets[i]);
comp_size = be64toh(vnd->sc_comp_offsets[i + 1])
- vnd->sc_comp_offsets[i];
if (comp_size > comp_maxsize)
comp_maxsize = comp_size;
}
vnd->sc_comp_offsets[vnd->sc_comp_numoffs - 1] =
be64toh(vnd->sc_comp_offsets[vnd->sc_comp_numoffs - 1]);
/* create compressed data buffer */
vnd->sc_comp_buff = malloc(comp_maxsize,
M_DEVBUF, M_WAITOK);
/* create decompressed buffer */
vnd->sc_comp_decombuf = malloc(vnd->sc_comp_blksz,
M_DEVBUF, M_WAITOK);
vnd->sc_comp_buffblk = -1;
/* Initialize decompress stream */
bzero(&vnd->sc_comp_stream, sizeof(z_stream));
vnd->sc_comp_stream.zalloc = vnd_alloc;
vnd->sc_comp_stream.zfree = vnd_free;
error = inflateInit2(&vnd->sc_comp_stream, MAX_WBITS);
if(error) {
if(vnd->sc_comp_stream.msg)
printf("vnd%d: compressed file, %s\n",
unit, vnd->sc_comp_stream.msg);
VOP_UNLOCK(nd.ni_vp, 0);
error = EINVAL;
goto close_and_exit;
}
vnd->sc_flags |= VNF_COMP | VNF_READONLY;
#else /* !VND_COMPRESSION */
VOP_UNLOCK(nd.ni_vp, 0);
error = EOPNOTSUPP;
goto close_and_exit;
#endif /* VND_COMPRESSION */
}
VOP_UNLOCK(nd.ni_vp, 0);
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 if (vnd->sc_size >= (32 * 64)) {
/*
* Size must be at least 2048 DEV_BSIZE blocks
* (1M) in order to use this geometry.
*/
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);
} else {
vnd->sc_geom.vng_secsize = DEV_BSIZE;
vnd->sc_geom.vng_nsectors = 1;
vnd->sc_geom.vng_ntracks = 1;
vnd->sc_geom.vng_ncylinders = vnd->sc_size;
}
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;
/* create the kernel thread, wait for it to be up */
error = kthread_create1(vndthread, vnd, &vnd->sc_kthread,
vnd->sc_dev.dv_xname);
if (error)
goto close_and_exit;
while ((vnd->sc_flags & VNF_KTHREAD) == 0) {
tsleep(&vnd->sc_kthread, PRIBIO, "vndthr", 0);
}
#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. */
vnd->sc_dkdev.dk_name = vnd->sc_dev.dv_xname;
pseudo_disk_attach(&vnd->sc_dkdev);
/* Initialize the xfer and buffer pools. */
pool_init(&vnd->sc_vxpool, sizeof(struct vndxfer), 0,
0, 0, "vndxpl", NULL);
/* Try and read the disklabel. */
vndgetdisklabel(dev, vnd);
vndunlock(vnd);
break;
close_and_exit:
(void) vn_close(nd.ni_vp, fflags, p->p_ucred, l);
unlock_and_exit:
#ifdef VND_COMPRESSION
/* free any allocated memory (for compressed file) */
if(vnd->sc_comp_offsets) {
free(vnd->sc_comp_offsets, M_DEVBUF);
vnd->sc_comp_offsets = NULL;
}
if(vnd->sc_comp_buff) {
free(vnd->sc_comp_buff, M_DEVBUF);
vnd->sc_comp_buff = NULL;
}
if(vnd->sc_comp_decombuf) {
free(vnd->sc_comp_decombuf, M_DEVBUF);
vnd->sc_comp_decombuf = NULL;
}
#endif /* VND_COMPRESSION */
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);
/* Detatch the disk. */
pseudo_disk_detach(&vnd->sc_dkdev);
break;
#ifdef COMPAT_30
case VNDIOOCGET: {
struct vnd_ouser *vnu;
struct vattr va;
vnu = (struct vnd_ouser *)data;
switch (error = vnd_cget(l, unit, &vnu->vnu_unit, &va)) {
case 0:
vnu->vnu_dev = va.va_fsid;
vnu->vnu_ino = va.va_fileid;
break;
case -1:
/* unused is not an error */
vnu->vnu_dev = 0;
vnu->vnu_ino = 0;
break;
default:
return error;
}
break;
}
#endif
case VNDIOCGET: {
struct vnd_user *vnu;
struct vattr va;
vnu = (struct vnd_user *)data;
switch (error = vnd_cget(l, unit, &vnu->vnu_unit, &va)) {
case 0:
vnu->vnu_dev = va.va_fsid;
vnu->vnu_ino = va.va_fileid;
break;
case -1:
/* unused is not an error */
vnu->vnu_dev = 0;
vnu->vnu_ino = 0;
break;
default:
return error;
}
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).
*/
static int
vndsetcred(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,
curlwp, 0, 0);
}
VOP_UNLOCK(vnd->sc_vp, 0);
free(tmpbuf, M_TEMP);
return (error);
}
/*
* Set maxactive based on FS type
*/
static void
vndthrottle(struct vnd_softc *vnd, struct vnode *vp)
{
#ifdef NFS
extern int (**nfsv2_vnodeop_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
static void
vndshutdown(void)
{
struct vnd_softc *vnd;
for (vnd = &vnd_softc[0]; vnd < &vnd_softc[numvnd]; vnd++)
if (vnd->sc_flags & VNF_INITED)
vndclear(vnd);
}
#endif
static void
vndclear(struct vnd_softc *vnd, int myminor)
{
struct vnode *vp = vnd->sc_vp;
struct lwp *l = curlwp;
int fflags = FREAD;
int bmaj, cmaj, i, mn;
int s;
#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_dev.dv_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;
s = splbio();
bufq_drain(vnd->sc_tab);
splx(s);
vnd->sc_flags |= VNF_VUNCONF;
wakeup(&vnd->sc_tab);
while (vnd->sc_flags & VNF_KTHREAD)
tsleep(&vnd->sc_kthread, PRIBIO, "vnthr", 0);
#ifdef VND_COMPRESSION
/* free the compressed file buffers */
if(vnd->sc_flags & VNF_COMP) {
if(vnd->sc_comp_offsets) {
free(vnd->sc_comp_offsets, M_DEVBUF);
vnd->sc_comp_offsets = NULL;
}
if(vnd->sc_comp_buff) {
free(vnd->sc_comp_buff, M_DEVBUF);
vnd->sc_comp_buff = NULL;
}
if(vnd->sc_comp_decombuf) {
free(vnd->sc_comp_decombuf, M_DEVBUF);
vnd->sc_comp_decombuf = NULL;
}
}
#endif /* VND_COMPRESSION */
vnd->sc_flags &=
~(VNF_INITED | VNF_READONLY | VNF_VLABEL
| VNF_VUNCONF | VNF_COMP);
if (vp == (struct vnode *)0)
panic("vndclear: null vp");
(void) vn_close(vp, fflags, vnd->sc_cred, l);
crfree(vnd->sc_cred);
vnd->sc_vp = (struct vnode *)0;
vnd->sc_cred = (struct ucred *)0;
vnd->sc_size = 0;
}
static int
vndsize(dev_t dev)
{
struct vnd_softc *sc;
struct disklabel *lp;
int part, unit, omask;
int size;
unit = vndunit(dev);
sc = (struct vnd_softc *)device_lookup(&vnd_cd, unit);
if (sc == NULL)
return -1;
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, curlwp)) /* XXX */
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, curlwp)) /* XXX */
return (-1);
return (size);
}
static int
vnddump(dev_t dev, daddr_t blkno, caddr_t va, size_t size)
{
/* Not implemented. */
return ENXIO;
}
static void
vndgetdefaultlabel(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.
*/
static void
vndgetdisklabel(dev_t dev, struct vnd_softc *sc)
{
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_dev.dv_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(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(struct vnd_softc *sc)
{
sc->sc_flags &= ~VNF_LOCKED;
if ((sc->sc_flags & VNF_WANTED) != 0) {
sc->sc_flags &= ~VNF_WANTED;
wakeup(sc);
}
}
#ifdef VND_COMPRESSION
/* compressed file read */
static void
compstrategy(struct buf *bp, off_t bn)
{
int error;
int unit = vndunit(bp->b_dev);
struct vnd_softc *vnd =
(struct vnd_softc *)device_lookup(&vnd_cd, unit);
u_int32_t comp_block;
struct uio auio;
caddr_t addr;
int s;
/* set up constants for data move */
auio.uio_rw = UIO_READ;
auio.uio_segflg = UIO_SYSSPACE;
/* read, and transfer the data */
addr = bp->b_data;
s = splbio();
while (bp->b_resid > 0) {
unsigned length;
size_t length_in_buffer;
u_int32_t offset_in_buffer;
struct iovec aiov;
/* calculate the compressed block number */
comp_block = bn / (off_t)vnd->sc_comp_blksz;
/* check for good block number */
if (comp_block >= vnd->sc_comp_numoffs) {
bp->b_error = EINVAL;
bp->b_flags |= B_ERROR;
splx(s);
return;
}
/* read in the compressed block, if not in buffer */
if (comp_block != vnd->sc_comp_buffblk) {
length = vnd->sc_comp_offsets[comp_block + 1] -
vnd->sc_comp_offsets[comp_block];
vn_lock(vnd->sc_vp, LK_EXCLUSIVE | LK_RETRY);
error = vn_rdwr(UIO_READ, vnd->sc_vp, vnd->sc_comp_buff,
length, vnd->sc_comp_offsets[comp_block],
UIO_SYSSPACE, IO_UNIT, vnd->sc_cred, NULL, NULL);
if (error) {
bp->b_error = error;
bp->b_flags |= B_ERROR;
VOP_UNLOCK(vnd->sc_vp, 0);
splx(s);
return;
}
/* uncompress the buffer */
vnd->sc_comp_stream.next_in = vnd->sc_comp_buff;
vnd->sc_comp_stream.avail_in = length;
vnd->sc_comp_stream.next_out = vnd->sc_comp_decombuf;
vnd->sc_comp_stream.avail_out = vnd->sc_comp_blksz;
inflateReset(&vnd->sc_comp_stream);
error = inflate(&vnd->sc_comp_stream, Z_FINISH);
if (error != Z_STREAM_END) {
if (vnd->sc_comp_stream.msg)
printf("%s: compressed file, %s\n",
vnd->sc_dev.dv_xname,
vnd->sc_comp_stream.msg);
bp->b_error = EBADMSG;
bp->b_flags |= B_ERROR;
VOP_UNLOCK(vnd->sc_vp, 0);
splx(s);
return;
}
vnd->sc_comp_buffblk = comp_block;
VOP_UNLOCK(vnd->sc_vp, 0);
}
/* transfer the usable uncompressed data */
offset_in_buffer = bn % (off_t)vnd->sc_comp_blksz;
length_in_buffer = vnd->sc_comp_blksz - offset_in_buffer;
if (length_in_buffer > bp->b_resid)
length_in_buffer = bp->b_resid;
auio.uio_iov = &aiov;
auio.uio_iovcnt = 1;
aiov.iov_base = addr;
aiov.iov_len = length_in_buffer;
auio.uio_resid = aiov.iov_len;
auio.uio_offset = 0;
error = uiomove(vnd->sc_comp_decombuf + offset_in_buffer,
length_in_buffer, &auio);
if (error) {
bp->b_error = error;
bp->b_flags |= B_ERROR;
splx(s);
return;
}
bn += length_in_buffer;
addr += length_in_buffer;
bp->b_resid -= length_in_buffer;
}
splx(s);
}
/* compression memory allocation routines */
static void *
vnd_alloc(void *aux, u_int items, u_int siz)
{
return malloc(items * siz, M_TEMP, M_NOWAIT);
}
static void
vnd_free(void *aux, void *ptr)
{
free(ptr, M_TEMP);
}
#endif /* VND_COMPRESSION */
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