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freebsd-dev/sys/dev/md/md.c

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/*
* ----------------------------------------------------------------------------
* "THE BEER-WARE LICENSE" (Revision 42):
* <phk@FreeBSD.ORG> wrote this file. As long as you retain this notice you
* can do whatever you want with this stuff. If we meet some day, and you think
* this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp
* ----------------------------------------------------------------------------
*
* $FreeBSD$
*
*/
/*
* The following functions are based in the vn(4) driver: mdstart_swap(),
* mdstart_vnode(), mdcreate_swap(), mdcreate_vnode() and mddestroy(),
* and as such under the following copyright:
*
* 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
*
* from: @(#)vn.c 8.6 (Berkeley) 4/1/94
* From: src/sys/dev/vn/vn.c,v 1.122 2000/12/16 16:06:03
*/
#include "opt_md.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/bio.h>
#include <sys/conf.h>
#include <sys/devicestat.h>
#include <sys/disk.h>
#include <sys/fcntl.h>
#include <sys/kernel.h>
#include <sys/kthread.h>
#include <sys/linker.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/mdioctl.h>
#include <sys/mutex.h>
#include <sys/namei.h>
#include <sys/proc.h>
#include <sys/queue.h>
#include <sys/stdint.h>
#include <sys/sysctl.h>
#include <sys/vnode.h>
#include <vm/vm.h>
#include <vm/vm_object.h>
#include <vm/vm_page.h>
#include <vm/vm_pager.h>
#include <vm/swap_pager.h>
#include <vm/uma.h>
#define MD_MODVER 1
#define MD_SHUTDOWN 0x10000 /* Tell worker thread to terminate. */
#ifndef MD_NSECT
#define MD_NSECT (10000 * 2)
#endif
static MALLOC_DEFINE(M_MD, "MD disk", "Memory Disk");
static MALLOC_DEFINE(M_MDSECT, "MD sectors", "Memory Disk Sectors");
static int md_debug;
SYSCTL_INT(_debug, OID_AUTO, mddebug, CTLFLAG_RW, &md_debug, 0, "");
#if defined(MD_ROOT) && defined(MD_ROOT_SIZE)
/* Image gets put here: */
static u_char mfs_root[MD_ROOT_SIZE*1024] = "MFS Filesystem goes here";
static u_char end_mfs_root[] __unused = "MFS Filesystem had better STOP here";
#endif
static int mdrootready;
static int mdunits;
static dev_t status_dev = 0;
#define CDEV_MAJOR 95
static d_strategy_t mdstrategy;
static d_open_t mdopen;
static d_close_t mdclose;
static d_ioctl_t mdioctl, mdctlioctl;
static struct cdevsw md_cdevsw = {
/* open */ mdopen,
/* close */ mdclose,
/* read */ physread,
/* write */ physwrite,
/* ioctl */ mdioctl,
/* poll */ nopoll,
/* mmap */ nommap,
/* strategy */ mdstrategy,
/* name */ MD_NAME,
/* maj */ CDEV_MAJOR,
/* dump */ nodump,
/* psize */ nopsize,
/* flags */ D_DISK | D_CANFREE | D_MEMDISK,
};
static struct cdevsw mdctl_cdevsw = {
/* open */ nullopen,
/* close */ nullclose,
/* read */ noread,
/* write */ nowrite,
/* ioctl */ mdctlioctl,
/* poll */ nopoll,
/* mmap */ nommap,
/* strategy */ nostrategy,
/* name */ MD_NAME,
/* maj */ CDEV_MAJOR
};
static struct cdevsw mddisk_cdevsw;
static LIST_HEAD(, md_s) md_softc_list = LIST_HEAD_INITIALIZER(&md_softc_list);
#define NINDIR (PAGE_SIZE / sizeof(uintptr_t))
#define NMASK (NINDIR-1)
static int nshift;
struct indir {
uintptr_t *array;
uint total;
uint used;
uint shift;
};
struct md_s {
int unit;
LIST_ENTRY(md_s) list;
struct devstat stats;
struct bio_queue_head bio_queue;
struct disk disk;
dev_t dev;
enum md_types type;
unsigned nsect;
unsigned opencount;
unsigned secsize;
unsigned flags;
char name[20];
struct proc *procp;
/* MD_MALLOC related fields */
struct indir *indir;
uma_zone_t uma;
/* MD_PRELOAD related fields */
u_char *pl_ptr;
unsigned pl_len;
/* MD_VNODE related fields */
struct vnode *vnode;
struct ucred *cred;
/* MD_SWAP related fields */
vm_object_t object;
};
static int mddestroy(struct md_s *sc, struct thread *td);
static struct indir *
new_indir(uint shift)
{
struct indir *ip;
ip = malloc(sizeof *ip, M_MD, M_NOWAIT | M_ZERO);
if (ip == NULL)
return (NULL);
ip->array = malloc(sizeof(uintptr_t) * NINDIR,
M_MDSECT, M_NOWAIT | M_ZERO);
if (ip->array == NULL) {
free(ip, M_MD);
return (NULL);
}
ip->total = NINDIR;
ip->shift = shift;
return (ip);
}
static void
del_indir(struct indir *ip)
{
free(ip->array, M_MDSECT);
free(ip, M_MD);
}
static void
destroy_indir(struct md_s *sc, struct indir *ip)
{
int i;
for (i = 0; i < NINDIR; i++) {
if (!ip->array[i])
continue;
if (ip->shift)
destroy_indir(sc, (struct indir*)(ip->array[i]));
else if (ip->array[i] > 255)
uma_zfree(sc->uma, (void *)(ip->array[i]));
}
del_indir(ip);
}
/*
* This function does the math and alloctes the top level "indir" structure
* for a device of "size" sectors.
*/
static struct indir *
dimension(off_t size)
{
off_t rcnt;
struct indir *ip;
int i, layer;
rcnt = size;
layer = 0;
while (rcnt > NINDIR) {
rcnt /= NINDIR;
layer++;
}
/* figure out log2(NINDIR) */
for (i = NINDIR, nshift = -1; i; nshift++)
i >>= 1;
/*
* XXX: the top layer is probably not fully populated, so we allocate
* too much space for ip->array in new_indir() here.
*/
ip = new_indir(layer * nshift);
return (ip);
}
/*
* Read a given sector
*/
static uintptr_t
s_read(struct indir *ip, off_t offset)
{
struct indir *cip;
int idx;
uintptr_t up;
if (md_debug > 1)
printf("s_read(%jd)\n", (intmax_t)offset);
up = 0;
for (cip = ip; cip != NULL;) {
if (cip->shift) {
idx = (offset >> cip->shift) & NMASK;
up = cip->array[idx];
cip = (struct indir *)up;
continue;
}
idx = offset & NMASK;
return (cip->array[idx]);
}
return (0);
}
/*
* Write a given sector, prune the tree if the value is 0
*/
static int
s_write(struct indir *ip, off_t offset, uintptr_t ptr)
{
struct indir *cip, *lip[10];
int idx, li;
uintptr_t up;
if (md_debug > 1)
printf("s_write(%jd, %p)\n", (intmax_t)offset, (void *)ptr);
up = 0;
li = 0;
cip = ip;
for (;;) {
lip[li++] = cip;
if (cip->shift) {
idx = (offset >> cip->shift) & NMASK;
up = cip->array[idx];
if (up != 0) {
cip = (struct indir *)up;
continue;
}
/* Allocate branch */
cip->array[idx] =
(uintptr_t)new_indir(cip->shift - nshift);
if (cip->array[idx] == 0)
return (ENOMEM);
cip->used++;
up = cip->array[idx];
cip = (struct indir *)up;
continue;
}
/* leafnode */
idx = offset & NMASK;
up = cip->array[idx];
if (up != 0)
cip->used--;
cip->array[idx] = ptr;
if (ptr != 0)
cip->used++;
break;
}
if (cip->used != 0 || li == 1)
return (0);
li--;
while (cip->used == 0 && cip != ip) {
li--;
idx = (offset >> lip[li]->shift) & NMASK;
up = lip[li]->array[idx];
KASSERT(up == (uintptr_t)cip, ("md screwed up"));
del_indir(cip);
lip[li]->array[idx] = 0;
lip[li]->used--;
cip = lip[li];
}
return (0);
}
static int
mdopen(dev_t dev, int flag, int fmt, struct thread *td)
{
struct md_s *sc;
struct disklabel *dl;
if (md_debug)
printf("mdopen(%s %x %x %p)\n",
devtoname(dev), flag, fmt, td);
sc = dev->si_drv1;
dl = &sc->disk.d_label;
bzero(dl, sizeof(*dl));
dl->d_secsize = sc->secsize;
dl->d_nsectors = sc->nsect > 63 ? 63 : sc->nsect;
dl->d_ntracks = 1;
dl->d_secpercyl = dl->d_nsectors * dl->d_ntracks;
dl->d_secperunit = sc->nsect;
dl->d_ncylinders = dl->d_secperunit / dl->d_secpercyl;
sc->opencount++;
return (0);
}
static int
mdclose(dev_t dev, int flags, int fmt, struct thread *td)
{
struct md_s *sc = dev->si_drv1;
sc->opencount--;
return (0);
}
static int
mdioctl(dev_t dev, u_long cmd, caddr_t addr, int flags, struct thread *td)
{
if (md_debug)
printf("mdioctl(%s %lx %p %x %p)\n",
devtoname(dev), cmd, addr, flags, td);
return (ENOIOCTL);
}
static int
mdstart_malloc(struct md_s *sc, struct bio *bp)
{
int i, error;
u_char *dst;
unsigned secno, nsec, uc;
uintptr_t sp, osp;
nsec = bp->bio_bcount / sc->secsize;
secno = bp->bio_pblkno;
dst = bp->bio_data;
error = 0;
while (nsec--) {
osp = s_read(sc->indir, secno);
if (bp->bio_cmd == BIO_DELETE) {
if (osp != 0)
error = s_write(sc->indir, secno, 0);
} else if (bp->bio_cmd == BIO_READ) {
if (osp == 0)
bzero(dst, sc->secsize);
else if (osp <= 255)
for (i = 0; i < sc->secsize; i++)
dst[i] = osp;
else
bcopy((void *)osp, dst, sc->secsize);
osp = 0;
} else if (bp->bio_cmd == BIO_WRITE) {
if (sc->flags & MD_COMPRESS) {
uc = dst[0];
for (i = 1; i < sc->secsize; i++)
if (dst[i] != uc)
break;
} else {
i = 0;
uc = 0;
}
if (i == sc->secsize) {
if (osp != uc)
error = s_write(sc->indir, secno, uc);
} else {
if (osp <= 255) {
sp = (uintptr_t) uma_zalloc(
sc->uma, M_NOWAIT);
if (sp == 0) {
error = ENOSPC;
break;
}
bcopy(dst, (void *)sp, sc->secsize);
error = s_write(sc->indir, secno, sp);
} else {
bcopy(dst, (void *)osp, sc->secsize);
osp = 0;
}
}
} else {
error = EOPNOTSUPP;
}
if (osp > 255)
uma_zfree(sc->uma, (void*)osp);
if (error)
break;
secno++;
dst += sc->secsize;
}
bp->bio_resid = 0;
return (error);
}
static int
mdstart_preload(struct md_s *sc, struct bio *bp)
{
if (bp->bio_cmd == BIO_DELETE) {
} else if (bp->bio_cmd == BIO_READ) {
bcopy(sc->pl_ptr + (bp->bio_pblkno << DEV_BSHIFT), bp->bio_data, bp->bio_bcount);
} else {
bcopy(bp->bio_data, sc->pl_ptr + (bp->bio_pblkno << DEV_BSHIFT), bp->bio_bcount);
}
bp->bio_resid = 0;
return (0);
}
static int
mdstart_vnode(struct md_s *sc, struct bio *bp)
{
int error;
struct uio auio;
struct iovec aiov;
struct mount *mp;
/*
* VNODE I/O
*
* If an error occurs, we set BIO_ERROR but we do not set
* B_INVAL because (for a write anyway), the buffer is
* still valid.
*/
bzero(&auio, sizeof(auio));
aiov.iov_base = bp->bio_data;
aiov.iov_len = bp->bio_bcount;
auio.uio_iov = &aiov;
auio.uio_iovcnt = 1;
auio.uio_offset = (vm_ooffset_t)bp->bio_pblkno * sc->secsize;
auio.uio_segflg = UIO_SYSSPACE;
if(bp->bio_cmd == BIO_READ)
auio.uio_rw = UIO_READ;
else
auio.uio_rw = UIO_WRITE;
auio.uio_resid = bp->bio_bcount;
auio.uio_td = curthread;
/*
* When reading set IO_DIRECT to try to avoid double-caching
* the data. When writing IO_DIRECT is not optimal, but we
* must set IO_NOWDRAIN to avoid a wdrain deadlock.
*/
if (bp->bio_cmd == BIO_READ) {
vn_lock(sc->vnode, LK_EXCLUSIVE | LK_RETRY, curthread);
error = VOP_READ(sc->vnode, &auio, IO_DIRECT, sc->cred);
} else {
(void) vn_start_write(sc->vnode, &mp, V_WAIT);
vn_lock(sc->vnode, LK_EXCLUSIVE | LK_RETRY, curthread);
error = VOP_WRITE(sc->vnode, &auio, IO_NOWDRAIN, sc->cred);
vn_finished_write(mp);
}
VOP_UNLOCK(sc->vnode, 0, curthread);
bp->bio_resid = auio.uio_resid;
return (error);
}
static int
mdstart_swap(struct md_s *sc, struct bio *bp)
{
if ((bp->bio_cmd == BIO_DELETE) && (sc->flags & MD_RESERVE))
biodone(bp);
else
vm_pager_strategy(sc->object, bp);
return (-1);
}
static void
mdstrategy(struct bio *bp)
{
struct md_s *sc;
if (md_debug > 1)
printf("mdstrategy(%p) %s %x, %lld, %ld, %p)\n",
(void *)bp, devtoname(bp->bio_dev), bp->bio_flags,
(long long)bp->bio_blkno, bp->bio_bcount / DEV_BSIZE,
(void *)bp->bio_data);
sc = bp->bio_dev->si_drv1;
/* XXX: LOCK(sc->lock) */
bioqdisksort(&sc->bio_queue, bp);
/* XXX: UNLOCK(sc->lock) */
wakeup(sc);
}
static void
md_kthread(void *arg)
{
struct md_s *sc;
struct bio *bp;
int error;
sc = arg;
curthread->td_base_pri = PRIBIO;
mtx_lock(&Giant);
for (;;) {
/* XXX: LOCK(unique unit numbers) */
bp = bioq_first(&sc->bio_queue);
if (bp)
bioq_remove(&sc->bio_queue, bp);
/* XXX: UNLOCK(unique unit numbers) */
if (!bp) {
tsleep(sc, PRIBIO, "mdwait", 0);
if (sc->flags & MD_SHUTDOWN) {
sc->procp = NULL;
wakeup(&sc->procp);
kthread_exit(0);
}
continue;
}
switch (sc->type) {
case MD_MALLOC:
devstat_start_transaction(&sc->stats);
error = mdstart_malloc(sc, bp);
break;
case MD_PRELOAD:
devstat_start_transaction(&sc->stats);
error = mdstart_preload(sc, bp);
break;
case MD_VNODE:
devstat_start_transaction(&sc->stats);
error = mdstart_vnode(sc, bp);
break;
case MD_SWAP:
error = mdstart_swap(sc, bp);
break;
default:
panic("Impossible md(type)");
break;
}
if (error != -1)
biofinish(bp, &sc->stats, error);
}
}
static struct md_s *
mdfind(int unit)
{
struct md_s *sc;
/* XXX: LOCK(unique unit numbers) */
LIST_FOREACH(sc, &md_softc_list, list) {
if (sc->unit == unit)
break;
}
/* XXX: UNLOCK(unique unit numbers) */
return (sc);
}
static struct md_s *
mdnew(int unit)
{
struct md_s *sc;
int error, max = -1;
/* XXX: LOCK(unique unit numbers) */
LIST_FOREACH(sc, &md_softc_list, list) {
if (sc->unit == unit) {
/* XXX: UNLOCK(unique unit numbers) */
return (NULL);
}
if (sc->unit > max)
max = sc->unit;
}
if (unit == -1)
unit = max + 1;
if (unit > DKMAXUNIT)
return (NULL);
sc = (struct md_s *)malloc(sizeof *sc, M_MD, M_WAITOK | M_ZERO);
sc->unit = unit;
sprintf(sc->name, "md%d", unit);
error = kthread_create(md_kthread, sc, &sc->procp, 0, "%s", sc->name);
if (error) {
free(sc, M_MD);
return (NULL);
}
LIST_INSERT_HEAD(&md_softc_list, sc, list);
/* XXX: UNLOCK(unique unit numbers) */
return (sc);
}
static void
mdinit(struct md_s *sc)
{
bioq_init(&sc->bio_queue);
devstat_add_entry(&sc->stats, MD_NAME, sc->unit, sc->secsize,
DEVSTAT_NO_ORDERED_TAGS,
DEVSTAT_TYPE_DIRECT | DEVSTAT_TYPE_IF_OTHER,
DEVSTAT_PRIORITY_OTHER);
sc->dev = disk_create(sc->unit, &sc->disk, 0, &md_cdevsw, &mddisk_cdevsw);
sc->dev->si_drv1 = sc;
}
/*
* XXX: we should check that the range they feed us is mapped.
* XXX: we should implement read-only.
*/
static int
mdcreate_preload(struct md_ioctl *mdio)
{
struct md_s *sc;
if (mdio->md_size == 0)
return (EINVAL);
if (mdio->md_options & ~(MD_AUTOUNIT))
return (EINVAL);
if (mdio->md_options & MD_AUTOUNIT) {
sc = mdnew(-1);
if (sc == NULL)
return (ENOMEM);
mdio->md_unit = sc->unit;
} else {
sc = mdnew(mdio->md_unit);
if (sc == NULL)
return (EBUSY);
}
sc->type = MD_PRELOAD;
sc->secsize = DEV_BSIZE;
sc->nsect = mdio->md_size;
sc->flags = mdio->md_options & MD_FORCE;
/* Cast to pointer size, then to pointer to avoid warning */
sc->pl_ptr = (u_char *)(uintptr_t)mdio->md_base;
sc->pl_len = (mdio->md_size << DEV_BSHIFT);
mdinit(sc);
return (0);
}
static int
mdcreate_malloc(struct md_ioctl *mdio)
{
struct md_s *sc;
off_t u;
uintptr_t sp;
int error;
error = 0;
if (mdio->md_size == 0)
return (EINVAL);
if (mdio->md_options & ~(MD_AUTOUNIT | MD_COMPRESS | MD_RESERVE))
return (EINVAL);
/* Compression doesn't make sense if we have reserved space */
if (mdio->md_options & MD_RESERVE)
mdio->md_options &= ~MD_COMPRESS;
if (mdio->md_options & MD_AUTOUNIT) {
sc = mdnew(-1);
if (sc == NULL)
return (ENOMEM);
mdio->md_unit = sc->unit;
} else {
sc = mdnew(mdio->md_unit);
if (sc == NULL)
return (EBUSY);
}
sc->type = MD_MALLOC;
sc->secsize = DEV_BSIZE;
sc->nsect = mdio->md_size;
sc->flags = mdio->md_options & (MD_COMPRESS | MD_FORCE);
sc->indir = dimension(sc->nsect);
sc->uma = uma_zcreate(sc->name, sc->secsize,
NULL, NULL, NULL, NULL, 0x1ff, 0);
if (mdio->md_options & MD_RESERVE) {
for (u = 0; u < sc->nsect; u++) {
sp = (uintptr_t) uma_zalloc(sc->uma, M_NOWAIT | M_ZERO);
if (sp != 0)
error = s_write(sc->indir, u, sp);
else
error = ENOMEM;
if (error)
break;
}
}
if (!error) {
printf("%s%d: Malloc disk\n", MD_NAME, sc->unit);
mdinit(sc);
} else
mddestroy(sc, NULL);
return (error);
}
static int
mdsetcred(struct md_s *sc, struct ucred *cred)
{
char *tmpbuf;
int error = 0;
/*
* Set credits in our softc
*/
if (sc->cred)
crfree(sc->cred);
sc->cred = crhold(cred);
/*
* Horrible kludge to establish credentials for NFS XXX.
*/
if (sc->vnode) {
struct uio auio;
struct iovec aiov;
tmpbuf = malloc(sc->secsize, M_TEMP, M_WAITOK);
bzero(&auio, sizeof(auio));
aiov.iov_base = tmpbuf;
aiov.iov_len = sc->secsize;
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(sc->vnode, LK_EXCLUSIVE | LK_RETRY, curthread);
error = VOP_READ(sc->vnode, &auio, 0, sc->cred);
VOP_UNLOCK(sc->vnode, 0, curthread);
free(tmpbuf, M_TEMP);
}
return (error);
}
static int
mdcreate_vnode(struct md_ioctl *mdio, struct thread *td)
{
struct md_s *sc;
struct vattr vattr;
struct nameidata nd;
int error, flags;
flags = FREAD|FWRITE;
NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, mdio->md_file, td);
error = vn_open(&nd, &flags, 0);
if (error) {
if (error != EACCES && error != EPERM && error != EROFS)
return (error);
flags &= ~FWRITE;
NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, mdio->md_file, td);
error = vn_open(&nd, &flags, 0);
if (error)
return (error);
}
NDFREE(&nd, NDF_ONLY_PNBUF);
if (nd.ni_vp->v_type != VREG ||
(error = VOP_GETATTR(nd.ni_vp, &vattr, td->td_ucred, td))) {
VOP_UNLOCK(nd.ni_vp, 0, td);
(void) vn_close(nd.ni_vp, flags, td->td_ucred, td);
return (error ? error : EINVAL);
}
VOP_UNLOCK(nd.ni_vp, 0, td);
if (mdio->md_options & MD_AUTOUNIT) {
sc = mdnew(-1);
mdio->md_unit = sc->unit;
} else {
sc = mdnew(mdio->md_unit);
}
if (sc == NULL) {
(void) vn_close(nd.ni_vp, flags, td->td_ucred, td);
return (EBUSY);
}
sc->type = MD_VNODE;
sc->flags = mdio->md_options & MD_FORCE;
if (!(flags & FWRITE))
sc->flags |= MD_READONLY;
sc->secsize = DEV_BSIZE;
sc->vnode = nd.ni_vp;
/*
* If the size is specified, override the file attributes.
*/
if (mdio->md_size)
sc->nsect = mdio->md_size;
else
sc->nsect = vattr.va_size / sc->secsize; /* XXX: round up ? */
if (sc->nsect == 0) {
mddestroy(sc, td);
return (EINVAL);
}
error = mdsetcred(sc, td->td_ucred);
if (error) {
mddestroy(sc, td);
return (error);
}
mdinit(sc);
return (0);
}
static int
mddestroy(struct md_s *sc, struct thread *td)
{
GIANT_REQUIRED;
if (sc->dev != NULL) {
devstat_remove_entry(&sc->stats);
disk_destroy(sc->dev);
}
sc->flags |= MD_SHUTDOWN;
wakeup(sc);
while (sc->procp != NULL)
tsleep(&sc->procp, PRIBIO, "mddestroy", hz / 10);
if (sc->vnode != NULL)
(void)vn_close(sc->vnode, sc->flags & MD_READONLY ?
FREAD : (FREAD|FWRITE), sc->cred, td);
if (sc->cred != NULL)
crfree(sc->cred);
if (sc->object != NULL) {
vm_pager_deallocate(sc->object);
}
if (sc->indir)
destroy_indir(sc, sc->indir);
if (sc->uma)
uma_zdestroy(sc->uma);
/* XXX: LOCK(unique unit numbers) */
LIST_REMOVE(sc, list);
/* XXX: UNLOCK(unique unit numbers) */
free(sc, M_MD);
return (0);
}
static int
mdcreate_swap(struct md_ioctl *mdio, struct thread *td)
{
int error;
struct md_s *sc;
GIANT_REQUIRED;
if (mdio->md_options & MD_AUTOUNIT) {
sc = mdnew(-1);
mdio->md_unit = sc->unit;
} else {
sc = mdnew(mdio->md_unit);
}
if (sc == NULL)
return (EBUSY);
sc->type = MD_SWAP;
/*
* Range check. Disallow negative sizes or any size less then the
* size of a page. Then round to a page.
*/
if (mdio->md_size == 0) {
mddestroy(sc, td);
return (EDOM);
}
/*
* Allocate an OBJT_SWAP object.
*
* sc_secsize is PAGE_SIZE'd
*
* mdio->size is in DEV_BSIZE'd chunks.
* Note the truncation.
*/
sc->secsize = PAGE_SIZE;
sc->nsect = mdio->md_size / (PAGE_SIZE / DEV_BSIZE);
sc->object = vm_pager_allocate(OBJT_SWAP, NULL, sc->secsize * (vm_offset_t)sc->nsect, VM_PROT_DEFAULT, 0);
sc->flags = mdio->md_options & MD_FORCE;
if (mdio->md_options & MD_RESERVE) {
if (swap_pager_reserve(sc->object, 0, sc->nsect) < 0) {
vm_pager_deallocate(sc->object);
sc->object = NULL;
mddestroy(sc, td);
return (EDOM);
}
}
error = mdsetcred(sc, td->td_ucred);
if (error)
mddestroy(sc, td);
else
mdinit(sc);
return (error);
}
static int
mddetach(int unit, struct thread *td)
{
struct md_s *sc;
sc = mdfind(unit);
if (sc == NULL)
return (ENOENT);
if (sc->opencount != 0 && !(sc->flags & MD_FORCE))
return (EBUSY);
switch(sc->type) {
case MD_VNODE:
case MD_SWAP:
case MD_MALLOC:
case MD_PRELOAD:
return (mddestroy(sc, td));
default:
return (EOPNOTSUPP);
}
}
static int
mdctlioctl(dev_t dev, u_long cmd, caddr_t addr, int flags, struct thread *td)
{
struct md_ioctl *mdio;
struct md_s *sc;
if (md_debug)
printf("mdctlioctl(%s %lx %p %x %p)\n",
devtoname(dev), cmd, addr, flags, td);
/*
* We assert the version number in the individual ioctl
* handlers instead of out here because (a) it is possible we
* may add another ioctl in the future which doesn't read an
* mdio, and (b) the correct return value for an unknown ioctl
* is ENOIOCTL, not EINVAL.
*/
mdio = (struct md_ioctl *)addr;
switch (cmd) {
case MDIOCATTACH:
if (mdio->md_version != MDIOVERSION)
return (EINVAL);
switch (mdio->md_type) {
case MD_MALLOC:
return (mdcreate_malloc(mdio));
case MD_PRELOAD:
return (mdcreate_preload(mdio));
case MD_VNODE:
return (mdcreate_vnode(mdio, td));
case MD_SWAP:
return (mdcreate_swap(mdio, td));
default:
return (EINVAL);
}
case MDIOCDETACH:
if (mdio->md_version != MDIOVERSION)
return (EINVAL);
if (mdio->md_file != NULL || mdio->md_size != 0 ||
mdio->md_options != 0)
return (EINVAL);
return (mddetach(mdio->md_unit, td));
case MDIOCQUERY:
if (mdio->md_version != MDIOVERSION)
return (EINVAL);
sc = mdfind(mdio->md_unit);
if (sc == NULL)
return (ENOENT);
mdio->md_type = sc->type;
mdio->md_options = sc->flags;
switch (sc->type) {
case MD_MALLOC:
mdio->md_size = sc->nsect;
break;
case MD_PRELOAD:
mdio->md_size = sc->nsect;
(u_char *)(uintptr_t)mdio->md_base = sc->pl_ptr;
break;
case MD_SWAP:
mdio->md_size = sc->nsect * (PAGE_SIZE / DEV_BSIZE);
break;
case MD_VNODE:
mdio->md_size = sc->nsect;
/* XXX fill this in */
mdio->md_file = NULL;
break;
}
return (0);
default:
return (ENOIOCTL);
};
return (ENOIOCTL);
}
static void
md_preloaded(u_char *image, unsigned length)
{
struct md_s *sc;
sc = mdnew(-1);
if (sc == NULL)
return;
sc->type = MD_PRELOAD;
sc->secsize = DEV_BSIZE;
sc->nsect = length / DEV_BSIZE;
sc->pl_ptr = image;
sc->pl_len = length;
if (sc->unit == 0)
mdrootready = 1;
mdinit(sc);
}
static void
md_drvinit(void *unused)
{
caddr_t mod;
caddr_t c;
u_char *ptr, *name, *type;
unsigned len;
#ifdef MD_ROOT_SIZE
md_preloaded(mfs_root, MD_ROOT_SIZE*1024);
#endif
mod = NULL;
while ((mod = preload_search_next_name(mod)) != NULL) {
name = (char *)preload_search_info(mod, MODINFO_NAME);
type = (char *)preload_search_info(mod, MODINFO_TYPE);
if (name == NULL)
continue;
if (type == NULL)
continue;
if (strcmp(type, "md_image") && strcmp(type, "mfs_root"))
continue;
c = preload_search_info(mod, MODINFO_ADDR);
ptr = *(u_char **)c;
c = preload_search_info(mod, MODINFO_SIZE);
len = *(unsigned *)c;
printf("%s%d: Preloaded image <%s> %d bytes at %p\n",
MD_NAME, mdunits, name, len, ptr);
md_preloaded(ptr, len);
}
status_dev = make_dev(&mdctl_cdevsw, 0xffff00ff, UID_ROOT, GID_WHEEL,
0600, MDCTL_NAME);
}
static int
md_modevent(module_t mod, int type, void *data)
{
int error;
struct md_s *sc;
switch (type) {
case MOD_LOAD:
md_drvinit(NULL);
break;
case MOD_UNLOAD:
LIST_FOREACH(sc, &md_softc_list, list) {
error = mddetach(sc->unit, curthread);
if (error != 0)
return (error);
}
if (status_dev)
destroy_dev(status_dev);
status_dev = 0;
break;
default:
break;
}
return (0);
}
static moduledata_t md_mod = {
MD_NAME,
md_modevent,
NULL
};
DECLARE_MODULE(md, md_mod, SI_SUB_DRIVERS, SI_ORDER_MIDDLE+CDEV_MAJOR);
MODULE_VERSION(md, MD_MODVER);
#ifdef MD_ROOT
static void
md_takeroot(void *junk)
{
if (mdrootready)
rootdevnames[0] = "ufs:/dev/md0c";
}
SYSINIT(md_root, SI_SUB_MOUNT_ROOT, SI_ORDER_FIRST, md_takeroot, NULL);
#endif
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