949 lines
22 KiB
C
949 lines
22 KiB
C
/*
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* ----------------------------------------------------------------------------
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* "THE BEER-WARE LICENSE" (Revision 42):
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* <phk@FreeBSD.ORG> wrote this file. As long as you retain this notice you
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* can do whatever you want with this stuff. If we meet some day, and you think
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* this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp
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* ----------------------------------------------------------------------------
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*
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* $FreeBSD$
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*
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*/
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/*
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* The following functions are based in the vn(4) driver: mdstart_swap(),
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* mdstart_vnode(), mdcreate_swap(), mdcreate_vnode() and mddestroy(),
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* and as such under the following copyright:
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*
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* Copyright (c) 1988 University of Utah.
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* Copyright (c) 1990, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* the Systems Programming Group of the University of Utah Computer
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* Science Department.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* from: Utah Hdr: vn.c 1.13 94/04/02
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*
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* from: @(#)vn.c 8.6 (Berkeley) 4/1/94
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* From: src/sys/dev/vn/vn.c,v 1.122 2000/12/16 16:06:03
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*/
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#include "opt_mfs.h" /* We have adopted some tasks from MFS */
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#include "opt_md.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/bio.h>
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#include <sys/conf.h>
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#include <sys/devicestat.h>
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#include <sys/disk.h>
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#include <sys/fcntl.h>
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#include <sys/kernel.h>
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#include <sys/linker.h>
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#include <sys/lock.h>
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#include <sys/malloc.h>
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#include <sys/mdioctl.h>
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#include <sys/namei.h>
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#include <sys/proc.h>
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#include <sys/queue.h>
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#include <sys/sysctl.h>
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#include <sys/vnode.h>
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#include <machine/atomic.h>
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#include <vm/vm.h>
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#include <vm/vm_object.h>
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#include <vm/vm_page.h>
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#include <vm/vm_pager.h>
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#include <vm/vm_zone.h>
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#include <vm/swap_pager.h>
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#define MD_MODVER 1
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#ifndef MD_NSECT
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#define MD_NSECT (10000 * 2)
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#endif
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MALLOC_DEFINE(M_MD, "MD disk", "Memory Disk");
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MALLOC_DEFINE(M_MDSECT, "MD sectors", "Memory Disk Sectors");
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static int md_debug;
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SYSCTL_INT(_debug, OID_AUTO, mddebug, CTLFLAG_RW, &md_debug, 0, "");
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#if defined(MFS_ROOT) && !defined(MD_ROOT)
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#define MD_ROOT MFS_ROOT
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#warning "option MFS_ROOT has been superceeded by MD_ROOT"
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#endif
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#if defined(MFS_ROOT_SIZE) && !defined(MD_ROOT_SIZE)
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#define MD_ROOT_SIZE MFS_ROOT_SIZE
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#warning "option MFS_ROOT_SIZE has been superceeded by MD_ROOT_SIZE"
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#endif
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#if defined(MD_ROOT) && defined(MD_ROOT_SIZE)
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/* Image gets put here: */
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static u_char mfs_root[MD_ROOT_SIZE*1024] = "MFS Filesystem goes here";
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static u_char end_mfs_root[] __unused = "MFS Filesystem had better STOP here";
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#endif
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static int mdrootready;
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static int mdunits;
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static dev_t status_dev = 0;
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#define CDEV_MAJOR 95
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static d_strategy_t mdstrategy;
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static d_open_t mdopen;
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static d_ioctl_t mdioctl, mdctlioctl;
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static struct cdevsw md_cdevsw = {
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/* open */ mdopen,
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/* close */ nullclose,
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/* read */ physread,
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/* write */ physwrite,
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/* ioctl */ mdioctl,
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/* poll */ nopoll,
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/* mmap */ nommap,
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/* strategy */ mdstrategy,
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/* name */ MD_NAME,
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/* maj */ CDEV_MAJOR,
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/* dump */ nodump,
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/* psize */ nopsize,
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/* flags */ D_DISK | D_CANFREE | D_MEMDISK,
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};
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static struct cdevsw mdctl_cdevsw = {
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/* open */ nullopen,
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/* close */ nullclose,
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/* read */ noread,
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/* write */ nowrite,
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/* ioctl */ mdctlioctl,
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/* poll */ nopoll,
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/* mmap */ nommap,
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/* strategy */ nostrategy,
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/* name */ MD_NAME,
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/* maj */ CDEV_MAJOR
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};
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static struct cdevsw mddisk_cdevsw;
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static LIST_HEAD(, md_s) md_softc_list = LIST_HEAD_INITIALIZER(&md_softc_list);
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struct md_s {
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int unit;
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LIST_ENTRY(md_s) list;
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struct devstat stats;
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struct bio_queue_head bio_queue;
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struct disk disk;
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dev_t dev;
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int busy;
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enum md_types type;
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unsigned nsect;
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unsigned secsize;
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unsigned flags;
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/* MD_MALLOC related fields */
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u_char **secp;
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/* MD_PRELOAD related fields */
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u_char *pl_ptr;
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unsigned pl_len;
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/* MD_VNODE related fields */
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struct vnode *vnode;
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struct ucred *cred;
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/* MD_OBJET related fields */
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vm_object_t object;
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};
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static int
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mdopen(dev_t dev, int flag, int fmt, struct proc *p)
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{
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struct md_s *sc;
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struct disklabel *dl;
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if (md_debug)
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printf("mdopen(%s %x %x %p)\n",
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devtoname(dev), flag, fmt, p);
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sc = dev->si_drv1;
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dl = &sc->disk.d_label;
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bzero(dl, sizeof(*dl));
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dl->d_secsize = sc->secsize;
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dl->d_nsectors = sc->nsect > 63 ? 63 : sc->nsect;
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dl->d_ntracks = 1;
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dl->d_secpercyl = dl->d_nsectors * dl->d_ntracks;
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dl->d_secperunit = sc->nsect;
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dl->d_ncylinders = dl->d_secperunit / dl->d_secpercyl;
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return (0);
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}
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static int
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mdioctl(dev_t dev, u_long cmd, caddr_t addr, int flags, struct proc *p)
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{
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if (md_debug)
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printf("mdioctl(%s %lx %p %x %p)\n",
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devtoname(dev), cmd, addr, flags, p);
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return (ENOIOCTL);
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}
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static void
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mdstart_malloc(struct md_s *sc)
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{
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int i;
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struct bio *bp;
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devstat_trans_flags dop;
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u_char *secp, **secpp, *dst;
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unsigned secno, nsec, secval, uc;
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for (;;) {
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/* XXX: LOCK(unique unit numbers) */
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bp = bioq_first(&sc->bio_queue);
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if (bp)
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bioq_remove(&sc->bio_queue, bp);
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/* XXX: UNLOCK(unique unit numbers) */
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if (!bp)
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break;
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devstat_start_transaction(&sc->stats);
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if (bp->bio_cmd == BIO_DELETE)
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dop = DEVSTAT_NO_DATA;
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else if (bp->bio_cmd == BIO_READ)
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dop = DEVSTAT_READ;
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else
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dop = DEVSTAT_WRITE;
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nsec = bp->bio_bcount / sc->secsize;
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secno = bp->bio_pblkno;
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dst = bp->bio_data;
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while (nsec--) {
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secpp = &sc->secp[secno];
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if ((uintptr_t)*secpp > 255) {
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secp = *secpp;
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secval = 0;
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} else {
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secp = NULL;
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secval = (uintptr_t) *secpp;
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}
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if (md_debug > 2)
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printf("%x %p %p %d\n",
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bp->bio_flags, secpp, secp, secval);
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if (bp->bio_cmd == BIO_DELETE) {
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if (!(sc->flags & MD_RESERVE) && secp != NULL) {
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FREE(secp, M_MDSECT);
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*secpp = 0;
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}
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} else if (bp->bio_cmd == BIO_READ) {
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if (secp != NULL) {
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bcopy(secp, dst, sc->secsize);
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} else if (secval) {
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for (i = 0; i < sc->secsize; i++)
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dst[i] = secval;
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} else {
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bzero(dst, sc->secsize);
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}
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} else {
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if (sc->flags & MD_COMPRESS) {
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uc = dst[0];
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for (i = 1; i < sc->secsize; i++)
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if (dst[i] != uc)
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break;
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} else {
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i = 0;
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uc = 0;
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}
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if (i == sc->secsize) {
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if (secp)
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FREE(secp, M_MDSECT);
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*secpp = (u_char *)(uintptr_t)uc;
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} else {
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if (secp == NULL)
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MALLOC(secp, u_char *, sc->secsize, M_MDSECT, M_WAITOK);
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bcopy(dst, secp, sc->secsize);
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*secpp = secp;
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}
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}
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secno++;
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dst += sc->secsize;
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}
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bp->bio_resid = 0;
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biofinish(bp, &sc->stats, 0);
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}
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return;
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}
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static void
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mdstart_preload(struct md_s *sc)
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{
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struct bio *bp;
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devstat_trans_flags dop;
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for (;;) {
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/* XXX: LOCK(unique unit numbers) */
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bp = bioq_first(&sc->bio_queue);
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if (bp)
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bioq_remove(&sc->bio_queue, bp);
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/* XXX: UNLOCK(unique unit numbers) */
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if (!bp)
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break;
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devstat_start_transaction(&sc->stats);
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if (bp->bio_cmd == BIO_DELETE) {
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dop = DEVSTAT_NO_DATA;
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} else if (bp->bio_cmd == BIO_READ) {
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dop = DEVSTAT_READ;
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bcopy(sc->pl_ptr + (bp->bio_pblkno << DEV_BSHIFT), bp->bio_data, bp->bio_bcount);
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} else {
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dop = DEVSTAT_WRITE;
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bcopy(bp->bio_data, sc->pl_ptr + (bp->bio_pblkno << DEV_BSHIFT), bp->bio_bcount);
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}
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bp->bio_resid = 0;
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biofinish(bp, &sc->stats, 0);
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}
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return;
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}
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static void
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mdstart_vnode(struct md_s *sc)
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{
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int error;
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struct bio *bp;
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struct uio auio;
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struct iovec aiov;
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struct mount *mp;
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/*
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* VNODE I/O
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*
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* If an error occurs, we set BIO_ERROR but we do not set
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* B_INVAL because (for a write anyway), the buffer is
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* still valid.
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*/
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for (;;) {
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/* XXX: LOCK(unique unit numbers) */
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bp = bioq_first(&sc->bio_queue);
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if (bp)
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bioq_remove(&sc->bio_queue, bp);
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/* XXX: UNLOCK(unique unit numbers) */
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if (!bp)
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break;
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devstat_start_transaction(&sc->stats);
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bzero(&auio, sizeof(auio));
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aiov.iov_base = bp->bio_data;
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aiov.iov_len = bp->bio_bcount;
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auio.uio_iov = &aiov;
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auio.uio_iovcnt = 1;
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auio.uio_offset = (vm_ooffset_t)bp->bio_pblkno * sc->secsize;
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auio.uio_segflg = UIO_SYSSPACE;
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if(bp->bio_cmd == BIO_READ)
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auio.uio_rw = UIO_READ;
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else
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auio.uio_rw = UIO_WRITE;
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auio.uio_resid = bp->bio_bcount;
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auio.uio_procp = curproc;
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if (VOP_ISLOCKED(sc->vnode, NULL))
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vprint("unexpected md driver lock", sc->vnode);
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if (bp->bio_cmd == BIO_READ) {
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vn_lock(sc->vnode, LK_EXCLUSIVE | LK_RETRY, curproc);
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error = VOP_READ(sc->vnode, &auio, 0, sc->cred);
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} else {
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(void) vn_start_write(sc->vnode, &mp, V_WAIT);
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vn_lock(sc->vnode, LK_EXCLUSIVE | LK_RETRY, curproc);
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error = VOP_WRITE(sc->vnode, &auio, 0, sc->cred);
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vn_finished_write(mp);
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}
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VOP_UNLOCK(sc->vnode, 0, curproc);
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bp->bio_resid = auio.uio_resid;
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biofinish(bp, &sc->stats, error);
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}
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return;
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}
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static void
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mdstart_swap(struct md_s *sc)
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{
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struct bio *bp;
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for (;;) {
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/* XXX: LOCK(unique unit numbers) */
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bp = bioq_first(&sc->bio_queue);
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if (bp)
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bioq_remove(&sc->bio_queue, bp);
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/* XXX: UNLOCK(unique unit numbers) */
|
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if (!bp)
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break;
|
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|
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#if 0
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devstat_start_transaction(&sc->stats);
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#endif
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|
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if ((bp->bio_cmd == BIO_DELETE) && (sc->flags & MD_RESERVE))
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biodone(bp);
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else
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vm_pager_strategy(sc->object, bp);
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|
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#if 0
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devstat_end_transaction_bio(&sc->stats, bp);
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#endif
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}
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return;
|
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}
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|
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static void
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mdstrategy(struct bio *bp)
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{
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struct md_s *sc;
|
|
|
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if (md_debug > 1)
|
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printf("mdstrategy(%p) %s %x, %d, %ld, %p)\n",
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bp, devtoname(bp->bio_dev), bp->bio_flags, bp->bio_blkno,
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bp->bio_bcount / DEV_BSIZE, bp->bio_data);
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|
|
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sc = bp->bio_dev->si_drv1;
|
|
|
|
/* XXX: LOCK(sc->lock) */
|
|
bioqdisksort(&sc->bio_queue, bp);
|
|
/* XXX: UNLOCK(sc->lock) */
|
|
|
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if (atomic_cmpset_int(&sc->busy, 0, 1) == 0)
|
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return;
|
|
|
|
switch (sc->type) {
|
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case MD_MALLOC:
|
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mdstart_malloc(sc);
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break;
|
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case MD_PRELOAD:
|
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mdstart_preload(sc);
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break;
|
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case MD_VNODE:
|
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mdstart_vnode(sc);
|
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break;
|
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case MD_SWAP:
|
|
mdstart_swap(sc);
|
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break;
|
|
default:
|
|
panic("Impossible md(type)");
|
|
break;
|
|
}
|
|
sc->busy = 0;
|
|
}
|
|
|
|
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 *
|
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mdnew(int unit)
|
|
{
|
|
struct md_s *sc;
|
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int 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);
|
|
MALLOC(sc, struct md_s *,sizeof(*sc), M_MD, M_WAITOK | M_ZERO);
|
|
sc->unit = unit;
|
|
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;
|
|
/* 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;
|
|
unsigned u;
|
|
|
|
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;
|
|
MALLOC(sc->secp, u_char **, sc->nsect * sizeof(u_char *), M_MD, M_WAITOK | M_ZERO);
|
|
if (mdio->md_options & MD_RESERVE) {
|
|
for (u = 0; u < sc->nsect; u++)
|
|
MALLOC(sc->secp[u], u_char *, DEV_BSIZE, M_MDSECT, M_WAITOK | M_ZERO);
|
|
}
|
|
printf("%s%d: Malloc disk\n", MD_NAME, sc->unit);
|
|
mdinit(sc);
|
|
return (0);
|
|
}
|
|
|
|
|
|
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 = crdup(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, curproc);
|
|
error = VOP_READ(sc->vnode, &auio, 0, sc->cred);
|
|
VOP_UNLOCK(sc->vnode, 0, curproc);
|
|
free(tmpbuf, M_TEMP);
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
mdcreate_vnode(struct md_ioctl *mdio, struct proc *p)
|
|
{
|
|
struct md_s *sc;
|
|
struct vattr vattr;
|
|
struct nameidata nd;
|
|
int error, flags;
|
|
|
|
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_VNODE;
|
|
|
|
flags = FREAD|FWRITE;
|
|
NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, mdio->md_file, p);
|
|
error = vn_open(&nd, &flags, 0);
|
|
if (error) {
|
|
if (error != EACCES && error != EPERM && error != EROFS)
|
|
return (error);
|
|
flags &= ~FWRITE;
|
|
sc->flags |= MD_READONLY;
|
|
NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, mdio->md_file, p);
|
|
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, p->p_ucred, p))) {
|
|
VOP_UNLOCK(nd.ni_vp, 0, p);
|
|
(void) vn_close(nd.ni_vp, flags, p->p_ucred, p);
|
|
return (error ? error : EINVAL);
|
|
}
|
|
VOP_UNLOCK(nd.ni_vp, 0, p);
|
|
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 ? */
|
|
error = mdsetcred(sc, p->p_ucred);
|
|
if (error) {
|
|
(void) vn_close(nd.ni_vp, flags, p->p_ucred, p);
|
|
return(error);
|
|
}
|
|
mdinit(sc);
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mddestroy(struct md_s *sc, struct md_ioctl *mdio, struct proc *p)
|
|
{
|
|
unsigned u;
|
|
|
|
if (sc->dev != NULL) {
|
|
devstat_remove_entry(&sc->stats);
|
|
disk_destroy(sc->dev);
|
|
}
|
|
if (sc->vnode != NULL)
|
|
(void)vn_close(sc->vnode, sc->flags & MD_READONLY ? FREAD : (FREAD|FWRITE), sc->cred, p);
|
|
if (sc->cred != NULL)
|
|
crfree(sc->cred);
|
|
if (sc->object != NULL)
|
|
vm_pager_deallocate(sc->object);
|
|
if (sc->secp != NULL) {
|
|
for (u = 0; u < sc->nsect; u++)
|
|
if ((uintptr_t)sc->secp[u] > 255)
|
|
FREE(sc->secp[u], M_MDSECT);
|
|
FREE(sc->secp, M_MD);
|
|
}
|
|
|
|
/* 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 proc *p)
|
|
{
|
|
int error;
|
|
struct md_s *sc;
|
|
|
|
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, mdio, p);
|
|
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);
|
|
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, mdio, p);
|
|
return(EDOM);
|
|
}
|
|
}
|
|
error = mdsetcred(sc, p->p_ucred);
|
|
if (error)
|
|
mddestroy(sc, mdio, p);
|
|
else
|
|
mdinit(sc);
|
|
return(error);
|
|
}
|
|
|
|
static int
|
|
mdctlioctl(dev_t dev, u_long cmd, caddr_t addr, int flags, struct proc *p)
|
|
{
|
|
struct md_ioctl *mdio;
|
|
struct md_s *sc;
|
|
|
|
if (md_debug)
|
|
printf("mdctlioctl(%s %lx %p %x %p)\n",
|
|
devtoname(dev), cmd, addr, flags, p);
|
|
|
|
mdio = (struct md_ioctl *)addr;
|
|
switch (cmd) {
|
|
case MDIOCATTACH:
|
|
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, p));
|
|
case MD_SWAP:
|
|
return(mdcreate_swap(mdio, p));
|
|
default:
|
|
return (EINVAL);
|
|
}
|
|
case MDIOCDETACH:
|
|
if (mdio->md_file != NULL)
|
|
return(EINVAL);
|
|
if (mdio->md_size != 0)
|
|
return(EINVAL);
|
|
if (mdio->md_options != 0)
|
|
return(EINVAL);
|
|
sc = mdfind(mdio->md_unit);
|
|
if (sc == NULL)
|
|
return (ENOENT);
|
|
switch(sc->type) {
|
|
case MD_VNODE:
|
|
case MD_SWAP:
|
|
case MD_MALLOC:
|
|
case MD_PRELOAD:
|
|
return(mddestroy(sc, mdio, p));
|
|
default:
|
|
return (EOPNOTSUPP);
|
|
}
|
|
case MDIOCQUERY:
|
|
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("md%d: Preloaded image <%s> %d bytes at %p\n",
|
|
mdunits, name, len, ptr);
|
|
md_preloaded(ptr, len);
|
|
}
|
|
status_dev = make_dev(&mdctl_cdevsw, 0xffff00ff, UID_ROOT, GID_WHEEL, 0600, "mdctl");
|
|
}
|
|
|
|
static int
|
|
md_modevent(module_t mod, int type, void *data)
|
|
{
|
|
switch (type) {
|
|
case MOD_LOAD:
|
|
md_drvinit(NULL);
|
|
break;
|
|
case MOD_UNLOAD:
|
|
if (!LIST_EMPTY(&md_softc_list))
|
|
return EBUSY;
|
|
if (status_dev)
|
|
destroy_dev(status_dev);
|
|
status_dev = 0;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static moduledata_t md_mod = {
|
|
"md",
|
|
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
|
|
|