8198a1a472
deal with any more. Spotted by: "Darren Freestone" <df@cops.org>
1208 lines
26 KiB
C
1208 lines
26 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_geom.h"
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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/fcntl.h>
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#include <sys/kernel.h>
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#include <sys/kthread.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/mutex.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 <geom/geom.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/swap_pager.h>
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#include <vm/uma.h>
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#define MD_MODVER 1
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#define MD_SHUTDOWN 0x10000 /* Tell worker thread to terminate. */
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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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static MALLOC_DEFINE(M_MD, "MD disk", "Memory Disk");
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static 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(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_ioctl_t mdctlioctl;
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static struct cdevsw mdctl_cdevsw = {
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.d_open = nullopen,
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.d_close = nullclose,
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.d_ioctl = mdctlioctl,
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.d_name = MD_NAME,
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.d_maj = CDEV_MAJOR
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};
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static LIST_HEAD(, md_s) md_softc_list = LIST_HEAD_INITIALIZER(&md_softc_list);
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#define NINDIR (PAGE_SIZE / sizeof(uintptr_t))
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#define NMASK (NINDIR-1)
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static int nshift;
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struct indir {
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uintptr_t *array;
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uint total;
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uint used;
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uint shift;
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};
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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 bio_queue_head bio_queue;
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struct mtx queue_mtx;
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dev_t dev;
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enum md_types type;
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unsigned nsect;
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unsigned opencount;
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unsigned secsize;
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unsigned fwheads;
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unsigned fwsectors;
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unsigned flags;
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char name[20];
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struct proc *procp;
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struct g_geom *gp;
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struct g_provider *pp;
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/* MD_MALLOC related fields */
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struct indir *indir;
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uma_zone_t uma;
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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_SWAP related fields */
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vm_object_t object;
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};
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static int mddestroy(struct md_s *sc, struct thread *td);
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static struct indir *
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new_indir(uint shift)
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{
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struct indir *ip;
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ip = malloc(sizeof *ip, M_MD, M_NOWAIT | M_ZERO);
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if (ip == NULL)
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return (NULL);
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ip->array = malloc(sizeof(uintptr_t) * NINDIR,
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M_MDSECT, M_NOWAIT | M_ZERO);
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if (ip->array == NULL) {
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free(ip, M_MD);
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return (NULL);
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}
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ip->total = NINDIR;
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ip->shift = shift;
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return (ip);
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}
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static void
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del_indir(struct indir *ip)
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{
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free(ip->array, M_MDSECT);
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free(ip, M_MD);
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}
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static void
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destroy_indir(struct md_s *sc, struct indir *ip)
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{
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int i;
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for (i = 0; i < NINDIR; i++) {
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if (!ip->array[i])
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continue;
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if (ip->shift)
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destroy_indir(sc, (struct indir*)(ip->array[i]));
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else if (ip->array[i] > 255)
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uma_zfree(sc->uma, (void *)(ip->array[i]));
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}
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del_indir(ip);
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}
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/*
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* This function does the math and alloctes the top level "indir" structure
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* for a device of "size" sectors.
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*/
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static struct indir *
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dimension(off_t size)
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{
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off_t rcnt;
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struct indir *ip;
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int i, layer;
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rcnt = size;
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layer = 0;
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while (rcnt > NINDIR) {
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rcnt /= NINDIR;
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layer++;
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}
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/* figure out log2(NINDIR) */
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for (i = NINDIR, nshift = -1; i; nshift++)
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i >>= 1;
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/*
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* XXX: the top layer is probably not fully populated, so we allocate
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* too much space for ip->array in here.
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*/
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ip = malloc(sizeof *ip, M_MD, M_WAITOK | M_ZERO);
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ip->array = malloc(sizeof(uintptr_t) * NINDIR,
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M_MDSECT, M_WAITOK | M_ZERO);
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ip->total = NINDIR;
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ip->shift = layer * nshift;
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return (ip);
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}
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/*
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* Read a given sector
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*/
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static uintptr_t
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s_read(struct indir *ip, off_t offset)
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{
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struct indir *cip;
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int idx;
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uintptr_t up;
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if (md_debug > 1)
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printf("s_read(%jd)\n", (intmax_t)offset);
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up = 0;
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for (cip = ip; cip != NULL;) {
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if (cip->shift) {
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idx = (offset >> cip->shift) & NMASK;
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up = cip->array[idx];
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cip = (struct indir *)up;
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continue;
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}
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idx = offset & NMASK;
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return (cip->array[idx]);
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}
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return (0);
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}
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/*
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* Write a given sector, prune the tree if the value is 0
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*/
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static int
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s_write(struct indir *ip, off_t offset, uintptr_t ptr)
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{
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struct indir *cip, *lip[10];
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int idx, li;
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uintptr_t up;
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if (md_debug > 1)
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printf("s_write(%jd, %p)\n", (intmax_t)offset, (void *)ptr);
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up = 0;
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li = 0;
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cip = ip;
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for (;;) {
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lip[li++] = cip;
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if (cip->shift) {
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idx = (offset >> cip->shift) & NMASK;
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up = cip->array[idx];
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if (up != 0) {
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cip = (struct indir *)up;
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continue;
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}
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/* Allocate branch */
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cip->array[idx] =
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(uintptr_t)new_indir(cip->shift - nshift);
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if (cip->array[idx] == 0)
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return (ENOSPC);
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cip->used++;
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up = cip->array[idx];
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cip = (struct indir *)up;
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continue;
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}
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/* leafnode */
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idx = offset & NMASK;
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up = cip->array[idx];
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if (up != 0)
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cip->used--;
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cip->array[idx] = ptr;
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if (ptr != 0)
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cip->used++;
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break;
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}
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if (cip->used != 0 || li == 1)
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return (0);
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li--;
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while (cip->used == 0 && cip != ip) {
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li--;
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idx = (offset >> lip[li]->shift) & NMASK;
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up = lip[li]->array[idx];
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KASSERT(up == (uintptr_t)cip, ("md screwed up"));
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del_indir(cip);
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lip[li]->array[idx] = 0;
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lip[li]->used--;
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cip = lip[li];
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}
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return (0);
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}
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struct g_class g_md_class = {
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.name = "MD",
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};
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static int
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g_md_access(struct g_provider *pp, int r, int w, int e)
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{
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struct md_s *sc;
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sc = pp->geom->softc;
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if (sc == NULL)
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return (ENXIO);
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r += pp->acr;
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w += pp->acw;
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e += pp->ace;
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if ((pp->acr + pp->acw + pp->ace) == 0 && (r + w + e) > 0) {
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sc->opencount = 1;
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} else if ((pp->acr + pp->acw + pp->ace) > 0 && (r + w + e) == 0) {
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sc->opencount = 0;
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}
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return (0);
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}
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static void
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g_md_start(struct bio *bp)
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{
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struct md_s *sc;
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sc = bp->bio_to->geom->softc;
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bp->bio_blkno = bp->bio_offset >> DEV_BSHIFT;
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bp->bio_pblkno = bp->bio_offset / sc->secsize;
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bp->bio_bcount = bp->bio_length;
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mtx_lock(&sc->queue_mtx);
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bioq_disksort(&sc->bio_queue, bp);
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mtx_unlock(&sc->queue_mtx);
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wakeup(sc);
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}
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DECLARE_GEOM_CLASS(g_md_class, g_md);
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static int
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mdstart_malloc(struct md_s *sc, struct bio *bp)
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{
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int i, error;
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u_char *dst;
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unsigned secno, nsec, uc;
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uintptr_t sp, osp;
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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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error = 0;
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while (nsec--) {
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osp = s_read(sc->indir, secno);
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if (bp->bio_cmd == BIO_DELETE) {
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if (osp != 0)
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error = s_write(sc->indir, secno, 0);
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} else if (bp->bio_cmd == BIO_READ) {
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if (osp == 0)
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bzero(dst, sc->secsize);
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else if (osp <= 255)
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for (i = 0; i < sc->secsize; i++)
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dst[i] = osp;
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else
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bcopy((void *)osp, dst, sc->secsize);
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osp = 0;
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} else if (bp->bio_cmd == BIO_WRITE) {
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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 (osp != uc)
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error = s_write(sc->indir, secno, uc);
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} else {
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if (osp <= 255) {
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sp = (uintptr_t) uma_zalloc(
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sc->uma, M_NOWAIT);
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if (sp == 0) {
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error = ENOSPC;
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break;
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}
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bcopy(dst, (void *)sp, sc->secsize);
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error = s_write(sc->indir, secno, sp);
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} else {
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bcopy(dst, (void *)osp, sc->secsize);
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osp = 0;
|
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}
|
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}
|
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} else {
|
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error = EOPNOTSUPP;
|
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}
|
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if (osp > 255)
|
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uma_zfree(sc->uma, (void*)osp);
|
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if (error)
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break;
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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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return (error);
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}
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|
|
static int
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mdstart_preload(struct md_s *sc, struct bio *bp)
|
|
{
|
|
|
|
if (bp->bio_cmd == BIO_DELETE) {
|
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} else if (bp->bio_cmd == BIO_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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bcopy(bp->bio_data, sc->pl_ptr + (bp->bio_pblkno << DEV_BSHIFT), bp->bio_bcount);
|
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}
|
|
bp->bio_resid = 0;
|
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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;
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|
else
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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.
|
|
*/
|
|
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, 0, sc->cred);
|
|
vn_finished_write(mp);
|
|
}
|
|
VOP_UNLOCK(sc->vnode, 0, curthread);
|
|
bp->bio_resid = auio.uio_resid;
|
|
return (error);
|
|
}
|
|
|
|
static void
|
|
mddone_swap(struct bio *bp)
|
|
{
|
|
|
|
bp->bio_completed = bp->bio_length - bp->bio_resid;
|
|
g_std_done(bp);
|
|
}
|
|
|
|
static int
|
|
mdstart_swap(struct md_s *sc, struct bio *bp)
|
|
{
|
|
{
|
|
struct bio *bp2;
|
|
|
|
bp2 = g_clone_bio(bp);
|
|
bp2->bio_done = mddone_swap;
|
|
bp2->bio_blkno = bp2->bio_offset >> DEV_BSHIFT;
|
|
bp2->bio_pblkno = bp2->bio_offset / sc->secsize;
|
|
bp2->bio_bcount = bp2->bio_length;
|
|
bp = bp2;
|
|
}
|
|
|
|
bp->bio_resid = 0;
|
|
if ((bp->bio_cmd == BIO_DELETE) && (sc->flags & MD_RESERVE))
|
|
biodone(bp);
|
|
else
|
|
vm_pager_strategy(sc->object, bp);
|
|
return (-1);
|
|
}
|
|
|
|
static void
|
|
md_kthread(void *arg)
|
|
{
|
|
struct md_s *sc;
|
|
struct bio *bp;
|
|
int error, hasgiant;
|
|
|
|
sc = arg;
|
|
curthread->td_base_pri = PRIBIO;
|
|
|
|
switch (sc->type) {
|
|
case MD_SWAP:
|
|
case MD_VNODE:
|
|
mtx_lock(&Giant);
|
|
hasgiant = 1;
|
|
break;
|
|
case MD_MALLOC:
|
|
case MD_PRELOAD:
|
|
default:
|
|
hasgiant = 0;
|
|
break;
|
|
}
|
|
|
|
for (;;) {
|
|
mtx_lock(&sc->queue_mtx);
|
|
bp = bioq_first(&sc->bio_queue);
|
|
if (bp)
|
|
bioq_remove(&sc->bio_queue, bp);
|
|
if (!bp) {
|
|
if (sc->flags & MD_SHUTDOWN) {
|
|
mtx_unlock(&sc->queue_mtx);
|
|
sc->procp = NULL;
|
|
wakeup(&sc->procp);
|
|
if (!hasgiant)
|
|
mtx_lock(&Giant);
|
|
kthread_exit(0);
|
|
}
|
|
msleep(sc, &sc->queue_mtx, PRIBIO | PDROP, "mdwait", 0);
|
|
continue;
|
|
}
|
|
mtx_unlock(&sc->queue_mtx);
|
|
if (bp->bio_cmd == BIO_GETATTR) {
|
|
if (sc->fwsectors && sc->fwheads &&
|
|
(g_handleattr_int(bp, "GEOM::fwsectors",
|
|
sc->fwsectors) ||
|
|
g_handleattr_int(bp, "GEOM::fwheads",
|
|
sc->fwheads)))
|
|
error = -1;
|
|
else
|
|
error = EOPNOTSUPP;
|
|
} else {
|
|
switch (sc->type) {
|
|
case MD_MALLOC:
|
|
error = mdstart_malloc(sc, bp);
|
|
break;
|
|
case MD_PRELOAD:
|
|
error = mdstart_preload(sc, bp);
|
|
break;
|
|
case MD_VNODE:
|
|
error = mdstart_vnode(sc, bp);
|
|
break;
|
|
case MD_SWAP:
|
|
error = mdstart_swap(sc, bp);
|
|
break;
|
|
default:
|
|
panic("Impossible md(type)");
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (error != -1) {
|
|
bp->bio_completed = bp->bio_length;
|
|
g_io_deliver(bp, 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;
|
|
sc = (struct md_s *)malloc(sizeof *sc, M_MD, M_WAITOK | M_ZERO);
|
|
sc->unit = unit;
|
|
bioq_init(&sc->bio_queue);
|
|
mtx_init(&sc->queue_mtx, "md bio queue", NULL, MTX_DEF);
|
|
sprintf(sc->name, "md%d", unit);
|
|
error = kthread_create(md_kthread, sc, &sc->procp, 0, 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)
|
|
{
|
|
|
|
struct g_geom *gp;
|
|
struct g_provider *pp;
|
|
|
|
DROP_GIANT();
|
|
g_topology_lock();
|
|
gp = g_new_geomf(&g_md_class, "md%d", sc->unit);
|
|
gp->start = g_md_start;
|
|
gp->access = g_md_access;
|
|
gp->softc = sc;
|
|
pp = g_new_providerf(gp, "md%d", sc->unit);
|
|
pp->mediasize = (off_t)sc->nsect * sc->secsize;
|
|
pp->sectorsize = sc->secsize;
|
|
sc->gp = gp;
|
|
sc->pp = pp;
|
|
g_error_provider(pp, 0);
|
|
g_topology_unlock();
|
|
PICKUP_GIANT();
|
|
}
|
|
|
|
/*
|
|
* 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);
|
|
if (mdio->md_secsize != 0 && !powerof2(mdio->md_secsize))
|
|
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;
|
|
if (mdio->md_secsize != 0)
|
|
sc->secsize = mdio->md_secsize;
|
|
else
|
|
sc->secsize = DEV_BSIZE;
|
|
if (mdio->md_fwsectors != 0)
|
|
sc->fwsectors = mdio->md_fwsectors;
|
|
if (mdio->md_fwheads != 0)
|
|
sc->fwheads = mdio->md_fwheads;
|
|
sc->nsect = mdio->md_size;
|
|
sc->nsect /= (sc->secsize / DEV_BSIZE);
|
|
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) {
|
|
mddestroy(sc, NULL);
|
|
return (error);
|
|
}
|
|
mdinit(sc);
|
|
if (!(mdio->md_options & MD_RESERVE))
|
|
sc->pp->flags |= G_PF_CANDELETE;
|
|
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 = 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 void
|
|
md_zapit(void *p, int cancel)
|
|
{
|
|
if (cancel)
|
|
return;
|
|
g_wither_geom(p, ENXIO);
|
|
}
|
|
|
|
static int
|
|
mddestroy(struct md_s *sc, struct thread *td)
|
|
{
|
|
|
|
GIANT_REQUIRED;
|
|
|
|
mtx_destroy(&sc->queue_mtx);
|
|
if (sc->gp) {
|
|
sc->gp->softc = NULL;
|
|
g_waitfor_event(md_zapit, sc->gp, M_WAITOK, sc->gp, NULL);
|
|
sc->gp = NULL;
|
|
sc->pp = NULL;
|
|
}
|
|
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_object_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_object_deallocate(sc->object);
|
|
sc->object = NULL;
|
|
mddestroy(sc, td);
|
|
return (EDOM);
|
|
}
|
|
}
|
|
error = mdsetcred(sc, td->td_ucred);
|
|
if (error) {
|
|
mddestroy(sc, td);
|
|
return (error);
|
|
}
|
|
mdinit(sc);
|
|
if (!(mdio->md_options & MD_RESERVE))
|
|
sc->pp->flags |= G_PF_CANDELETE;
|
|
return (0);
|
|
}
|
|
|
|
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;
|
|
int i;
|
|
|
|
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;
|
|
mdio->md_base = (uint64_t)(intptr_t)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);
|
|
case MDIOCLIST:
|
|
i = 1;
|
|
LIST_FOREACH(sc, &md_softc_list, list) {
|
|
if (i == MDNPAD - 1)
|
|
mdio->md_pad[i] = -1;
|
|
else
|
|
mdio->md_pad[i++] = sc->unit;
|
|
}
|
|
mdio->md_pad[0] = i - 1;
|
|
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 = *(size_t *)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/md0";
|
|
}
|
|
|
|
SYSINIT(md_root, SI_SUB_MOUNT_ROOT, SI_ORDER_FIRST, md_takeroot, NULL);
|
|
#endif /* MD_ROOT */
|