59ec9023ca
The vnode-backed md(4) has to map the unmapped bio because VOP_READ() and VOP_WRITE() interfaces do not allow to pass unmapped requests to the filesystem. Vnode-backed md(4) uses pbufs instead of relying on the bio_transient_map, to avoid usual md deadlock. Sponsored by: The FreeBSD Foundation Tested by: pho, scottl
1617 lines
38 KiB
C
1617 lines
38 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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* Copyright (c) 2013 The FreeBSD Foundation
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* 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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* Portions of this software were developed by Konstantin Belousov
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* under sponsorship from the FreeBSD Foundation.
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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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* 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/buf.h>
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#include <sys/conf.h>
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#include <sys/devicestat.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/limits.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/mount.h>
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#include <sys/mutex.h>
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#include <sys/sx.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/rwlock.h>
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#include <sys/sbuf.h>
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#include <sys/sched.h>
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#include <sys/sf_buf.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_param.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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#define MD_EXITING 0x20000 /* Worker thread is exiting. */
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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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"Enable md(4) debug messages");
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static int md_malloc_wait;
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SYSCTL_INT(_vm, OID_AUTO, md_malloc_wait, CTLFLAG_RW, &md_malloc_wait, 0,
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"Allow malloc to wait for memory allocations");
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#if defined(MD_ROOT) && !defined(MD_ROOT_FSTYPE)
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#define MD_ROOT_FSTYPE "ufs"
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#endif
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#if defined(MD_ROOT) && defined(MD_ROOT_SIZE)
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/*
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* Preloaded image gets put here.
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* Applications that patch the object with the image can determine
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* the size looking at the start and end markers (strings),
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* so we want them contiguous.
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*/
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static struct {
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u_char start[MD_ROOT_SIZE*1024];
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u_char end[128];
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} mfs_root = {
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.start = "MFS Filesystem goes here",
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.end = "MFS Filesystem had better STOP here",
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};
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#endif
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static g_init_t g_md_init;
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static g_fini_t g_md_fini;
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static g_start_t g_md_start;
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static g_access_t g_md_access;
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static void g_md_dumpconf(struct sbuf *sb, const char *indent,
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struct g_geom *gp, struct g_consumer *cp __unused, struct g_provider *pp);
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static struct cdev *status_dev = 0;
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static struct sx md_sx;
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static struct unrhdr *md_uh;
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static d_ioctl_t mdctlioctl;
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static struct cdevsw mdctl_cdevsw = {
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.d_version = D_VERSION,
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.d_ioctl = mdctlioctl,
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.d_name = MD_NAME,
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};
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struct g_class g_md_class = {
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.name = "MD",
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.version = G_VERSION,
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.init = g_md_init,
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.fini = g_md_fini,
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.start = g_md_start,
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.access = g_md_access,
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.dumpconf = g_md_dumpconf,
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};
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DECLARE_GEOM_CLASS(g_md_class, g_md);
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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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static int md_vnode_pbuf_freecnt;
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struct indir {
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uintptr_t *array;
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u_int total;
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u_int used;
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u_int 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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struct cdev *dev;
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enum md_types type;
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off_t mediasize;
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unsigned sectorsize;
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unsigned opencount;
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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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int (*start)(struct md_s *sc, struct bio *bp);
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struct devstat *devstat;
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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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size_t pl_len;
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/* MD_VNODE related fields */
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struct vnode *vnode;
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char file[PATH_MAX];
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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 struct indir *
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new_indir(u_int shift)
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{
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struct indir *ip;
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ip = malloc(sizeof *ip, M_MD, (md_malloc_wait ? M_WAITOK : M_NOWAIT)
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| 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, (md_malloc_wait ? M_WAITOK : 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 allocates 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 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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/*
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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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|
|
|
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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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if (r <= 0 && w <= 0 && e <= 0)
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return (0);
|
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return (ENXIO);
|
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}
|
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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 ((sc->flags & MD_READONLY) != 0 && w > 0)
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return (EROFS);
|
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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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if ((bp->bio_cmd == BIO_READ) || (bp->bio_cmd == BIO_WRITE))
|
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devstat_start_transaction_bio(sc->devstat, bp);
|
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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);
|
|
}
|
|
|
|
#define MD_MALLOC_MOVE_ZERO 1
|
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#define MD_MALLOC_MOVE_FILL 2
|
|
#define MD_MALLOC_MOVE_READ 3
|
|
#define MD_MALLOC_MOVE_WRITE 4
|
|
#define MD_MALLOC_MOVE_CMP 5
|
|
|
|
static int
|
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md_malloc_move(vm_page_t **mp, int *ma_offs, unsigned sectorsize,
|
|
void *ptr, u_char fill, int op)
|
|
{
|
|
struct sf_buf *sf;
|
|
vm_page_t m, *mp1;
|
|
char *p, first;
|
|
off_t *uc;
|
|
unsigned n;
|
|
int error, i, ma_offs1, sz, first_read;
|
|
|
|
m = NULL;
|
|
error = 0;
|
|
sf = NULL;
|
|
/* if (op == MD_MALLOC_MOVE_CMP) { gcc */
|
|
first = 0;
|
|
first_read = 0;
|
|
uc = ptr;
|
|
mp1 = *mp;
|
|
ma_offs1 = *ma_offs;
|
|
/* } */
|
|
sched_pin();
|
|
for (n = sectorsize; n != 0; n -= sz) {
|
|
sz = imin(PAGE_SIZE - *ma_offs, n);
|
|
if (m != **mp) {
|
|
if (sf != NULL)
|
|
sf_buf_free(sf);
|
|
m = **mp;
|
|
sf = sf_buf_alloc(m, SFB_CPUPRIVATE |
|
|
(md_malloc_wait ? 0 : SFB_NOWAIT));
|
|
if (sf == NULL) {
|
|
error = ENOMEM;
|
|
break;
|
|
}
|
|
}
|
|
p = (char *)sf_buf_kva(sf) + *ma_offs;
|
|
switch (op) {
|
|
case MD_MALLOC_MOVE_ZERO:
|
|
bzero(p, sz);
|
|
break;
|
|
case MD_MALLOC_MOVE_FILL:
|
|
memset(p, fill, sz);
|
|
break;
|
|
case MD_MALLOC_MOVE_READ:
|
|
bcopy(ptr, p, sz);
|
|
cpu_flush_dcache(p, sz);
|
|
break;
|
|
case MD_MALLOC_MOVE_WRITE:
|
|
bcopy(p, ptr, sz);
|
|
break;
|
|
case MD_MALLOC_MOVE_CMP:
|
|
for (i = 0; i < sz; i++, p++) {
|
|
if (!first_read) {
|
|
*uc = (u_char)*p;
|
|
first = *p;
|
|
first_read = 1;
|
|
} else if (*p != first) {
|
|
error = EDOOFUS;
|
|
break;
|
|
}
|
|
}
|
|
break;
|
|
default:
|
|
KASSERT(0, ("md_malloc_move unknown op %d\n", op));
|
|
break;
|
|
}
|
|
if (error != 0)
|
|
break;
|
|
*ma_offs += sz;
|
|
*ma_offs %= PAGE_SIZE;
|
|
if (*ma_offs == 0)
|
|
(*mp)++;
|
|
ptr = (char *)ptr + sz;
|
|
}
|
|
|
|
if (sf != NULL)
|
|
sf_buf_free(sf);
|
|
sched_unpin();
|
|
if (op == MD_MALLOC_MOVE_CMP && error != 0) {
|
|
*mp = mp1;
|
|
*ma_offs = ma_offs1;
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
mdstart_malloc(struct md_s *sc, struct bio *bp)
|
|
{
|
|
u_char *dst;
|
|
vm_page_t *m;
|
|
int i, error, error1, ma_offs, notmapped;
|
|
off_t secno, nsec, uc;
|
|
uintptr_t sp, osp;
|
|
|
|
switch (bp->bio_cmd) {
|
|
case BIO_READ:
|
|
case BIO_WRITE:
|
|
case BIO_DELETE:
|
|
break;
|
|
default:
|
|
return (EOPNOTSUPP);
|
|
}
|
|
|
|
notmapped = (bp->bio_flags & BIO_UNMAPPED) != 0;
|
|
if (notmapped) {
|
|
m = bp->bio_ma;
|
|
ma_offs = bp->bio_ma_offset;
|
|
dst = NULL;
|
|
} else {
|
|
dst = bp->bio_data;
|
|
}
|
|
|
|
nsec = bp->bio_length / sc->sectorsize;
|
|
secno = bp->bio_offset / sc->sectorsize;
|
|
error = 0;
|
|
while (nsec--) {
|
|
osp = s_read(sc->indir, secno);
|
|
if (bp->bio_cmd == BIO_DELETE) {
|
|
if (osp != 0)
|
|
error = s_write(sc->indir, secno, 0);
|
|
} else if (bp->bio_cmd == BIO_READ) {
|
|
if (osp == 0) {
|
|
if (notmapped) {
|
|
error = md_malloc_move(&m, &ma_offs,
|
|
sc->sectorsize, NULL, 0,
|
|
MD_MALLOC_MOVE_ZERO);
|
|
} else
|
|
bzero(dst, sc->sectorsize);
|
|
} else if (osp <= 255) {
|
|
if (notmapped) {
|
|
error = md_malloc_move(&m, &ma_offs,
|
|
sc->sectorsize, NULL, osp,
|
|
MD_MALLOC_MOVE_FILL);
|
|
} else
|
|
memset(dst, osp, sc->sectorsize);
|
|
} else {
|
|
if (notmapped) {
|
|
error = md_malloc_move(&m, &ma_offs,
|
|
sc->sectorsize, (void *)osp, 0,
|
|
MD_MALLOC_MOVE_READ);
|
|
} else {
|
|
bcopy((void *)osp, dst, sc->sectorsize);
|
|
cpu_flush_dcache(dst, sc->sectorsize);
|
|
}
|
|
}
|
|
osp = 0;
|
|
} else if (bp->bio_cmd == BIO_WRITE) {
|
|
if (sc->flags & MD_COMPRESS) {
|
|
if (notmapped) {
|
|
error1 = md_malloc_move(&m, &ma_offs,
|
|
sc->sectorsize, &uc, 0,
|
|
MD_MALLOC_MOVE_CMP);
|
|
i = error1 == 0 ? sc->sectorsize : 0;
|
|
} else {
|
|
uc = dst[0];
|
|
for (i = 1; i < sc->sectorsize; i++) {
|
|
if (dst[i] != uc)
|
|
break;
|
|
}
|
|
}
|
|
} else {
|
|
i = 0;
|
|
uc = 0;
|
|
}
|
|
if (i == sc->sectorsize) {
|
|
if (osp != uc)
|
|
error = s_write(sc->indir, secno, uc);
|
|
} else {
|
|
if (osp <= 255) {
|
|
sp = (uintptr_t)uma_zalloc(sc->uma,
|
|
md_malloc_wait ? M_WAITOK :
|
|
M_NOWAIT);
|
|
if (sp == 0) {
|
|
error = ENOSPC;
|
|
break;
|
|
}
|
|
if (notmapped) {
|
|
error = md_malloc_move(&m,
|
|
&ma_offs, sc->sectorsize,
|
|
(void *)sp, 0,
|
|
MD_MALLOC_MOVE_WRITE);
|
|
} else {
|
|
bcopy(dst, (void *)sp,
|
|
sc->sectorsize);
|
|
}
|
|
error = s_write(sc->indir, secno, sp);
|
|
} else {
|
|
if (notmapped) {
|
|
error = md_malloc_move(&m,
|
|
&ma_offs, sc->sectorsize,
|
|
(void *)osp, 0,
|
|
MD_MALLOC_MOVE_WRITE);
|
|
} else {
|
|
bcopy(dst, (void *)osp,
|
|
sc->sectorsize);
|
|
}
|
|
osp = 0;
|
|
}
|
|
}
|
|
} else {
|
|
error = EOPNOTSUPP;
|
|
}
|
|
if (osp > 255)
|
|
uma_zfree(sc->uma, (void*)osp);
|
|
if (error != 0)
|
|
break;
|
|
secno++;
|
|
if (!notmapped)
|
|
dst += sc->sectorsize;
|
|
}
|
|
bp->bio_resid = 0;
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
mdstart_preload(struct md_s *sc, struct bio *bp)
|
|
{
|
|
|
|
switch (bp->bio_cmd) {
|
|
case BIO_READ:
|
|
bcopy(sc->pl_ptr + bp->bio_offset, bp->bio_data,
|
|
bp->bio_length);
|
|
cpu_flush_dcache(bp->bio_data, bp->bio_length);
|
|
break;
|
|
case BIO_WRITE:
|
|
bcopy(bp->bio_data, sc->pl_ptr + bp->bio_offset,
|
|
bp->bio_length);
|
|
break;
|
|
}
|
|
bp->bio_resid = 0;
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mdstart_vnode(struct md_s *sc, struct bio *bp)
|
|
{
|
|
int error;
|
|
struct uio auio;
|
|
struct iovec aiov;
|
|
struct mount *mp;
|
|
struct vnode *vp;
|
|
struct buf *pb;
|
|
struct thread *td;
|
|
off_t end, zerosize;
|
|
|
|
switch (bp->bio_cmd) {
|
|
case BIO_READ:
|
|
case BIO_WRITE:
|
|
case BIO_DELETE:
|
|
case BIO_FLUSH:
|
|
break;
|
|
default:
|
|
return (EOPNOTSUPP);
|
|
}
|
|
|
|
td = curthread;
|
|
vp = sc->vnode;
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
|
|
if (bp->bio_cmd == BIO_FLUSH) {
|
|
(void) vn_start_write(vp, &mp, V_WAIT);
|
|
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
|
|
error = VOP_FSYNC(vp, MNT_WAIT, td);
|
|
VOP_UNLOCK(vp, 0);
|
|
vn_finished_write(mp);
|
|
return (error);
|
|
}
|
|
|
|
bzero(&auio, sizeof(auio));
|
|
|
|
/*
|
|
* Special case for BIO_DELETE. On the surface, this is very
|
|
* similar to BIO_WRITE, except that we write from our own
|
|
* fixed-length buffer, so we have to loop. The net result is
|
|
* that the two cases end up having very little in common.
|
|
*/
|
|
if (bp->bio_cmd == BIO_DELETE) {
|
|
zerosize = ZERO_REGION_SIZE -
|
|
(ZERO_REGION_SIZE % sc->sectorsize);
|
|
auio.uio_iov = &aiov;
|
|
auio.uio_iovcnt = 1;
|
|
auio.uio_offset = (vm_ooffset_t)bp->bio_offset;
|
|
auio.uio_segflg = UIO_SYSSPACE;
|
|
auio.uio_rw = UIO_WRITE;
|
|
auio.uio_td = td;
|
|
end = bp->bio_offset + bp->bio_length;
|
|
(void) vn_start_write(vp, &mp, V_WAIT);
|
|
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
|
|
error = 0;
|
|
while (auio.uio_offset < end) {
|
|
aiov.iov_base = __DECONST(void *, zero_region);
|
|
aiov.iov_len = end - auio.uio_offset;
|
|
if (aiov.iov_len > zerosize)
|
|
aiov.iov_len = zerosize;
|
|
auio.uio_resid = aiov.iov_len;
|
|
error = VOP_WRITE(vp, &auio,
|
|
sc->flags & MD_ASYNC ? 0 : IO_SYNC, sc->cred);
|
|
if (error != 0)
|
|
break;
|
|
}
|
|
VOP_UNLOCK(vp, 0);
|
|
vn_finished_write(mp);
|
|
bp->bio_resid = end - auio.uio_offset;
|
|
return (error);
|
|
}
|
|
|
|
KASSERT(bp->bio_length <= MAXPHYS, ("bio_length %jd",
|
|
(uintmax_t)bp->bio_length));
|
|
if ((bp->bio_flags & BIO_UNMAPPED) == 0) {
|
|
pb = NULL;
|
|
aiov.iov_base = bp->bio_data;
|
|
} else {
|
|
pb = getpbuf(&md_vnode_pbuf_freecnt);
|
|
pmap_qenter((vm_offset_t)pb->b_data, bp->bio_ma, bp->bio_ma_n);
|
|
aiov.iov_base = (void *)((vm_offset_t)pb->b_data +
|
|
bp->bio_ma_offset);
|
|
}
|
|
aiov.iov_len = bp->bio_length;
|
|
auio.uio_iov = &aiov;
|
|
auio.uio_iovcnt = 1;
|
|
auio.uio_offset = (vm_ooffset_t)bp->bio_offset;
|
|
auio.uio_segflg = UIO_SYSSPACE;
|
|
if (bp->bio_cmd == BIO_READ)
|
|
auio.uio_rw = UIO_READ;
|
|
else if (bp->bio_cmd == BIO_WRITE)
|
|
auio.uio_rw = UIO_WRITE;
|
|
else
|
|
panic("wrong BIO_OP in mdstart_vnode");
|
|
auio.uio_resid = bp->bio_length;
|
|
auio.uio_td = td;
|
|
/*
|
|
* 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(vp, LK_EXCLUSIVE | LK_RETRY);
|
|
error = VOP_READ(vp, &auio, IO_DIRECT, sc->cred);
|
|
VOP_UNLOCK(vp, 0);
|
|
} else {
|
|
(void) vn_start_write(vp, &mp, V_WAIT);
|
|
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
|
|
error = VOP_WRITE(vp, &auio, sc->flags & MD_ASYNC ? 0 : IO_SYNC,
|
|
sc->cred);
|
|
VOP_UNLOCK(vp, 0);
|
|
vn_finished_write(mp);
|
|
}
|
|
if ((bp->bio_flags & BIO_UNMAPPED) != 0) {
|
|
pmap_qremove((vm_offset_t)pb->b_data, bp->bio_ma_n);
|
|
relpbuf(pb, &md_vnode_pbuf_freecnt);
|
|
}
|
|
bp->bio_resid = auio.uio_resid;
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
mdstart_swap(struct md_s *sc, struct bio *bp)
|
|
{
|
|
vm_page_t m;
|
|
u_char *p;
|
|
vm_pindex_t i, lastp;
|
|
int rv, ma_offs, offs, len, lastend;
|
|
|
|
switch (bp->bio_cmd) {
|
|
case BIO_READ:
|
|
case BIO_WRITE:
|
|
case BIO_DELETE:
|
|
break;
|
|
default:
|
|
return (EOPNOTSUPP);
|
|
}
|
|
|
|
p = bp->bio_data;
|
|
ma_offs = (bp->bio_flags & BIO_UNMAPPED) == 0 ? 0 : bp->bio_ma_offset;
|
|
|
|
/*
|
|
* offs is the offset at which to start operating on the
|
|
* next (ie, first) page. lastp is the last page on
|
|
* which we're going to operate. lastend is the ending
|
|
* position within that last page (ie, PAGE_SIZE if
|
|
* we're operating on complete aligned pages).
|
|
*/
|
|
offs = bp->bio_offset % PAGE_SIZE;
|
|
lastp = (bp->bio_offset + bp->bio_length - 1) / PAGE_SIZE;
|
|
lastend = (bp->bio_offset + bp->bio_length - 1) % PAGE_SIZE + 1;
|
|
|
|
rv = VM_PAGER_OK;
|
|
VM_OBJECT_WLOCK(sc->object);
|
|
vm_object_pip_add(sc->object, 1);
|
|
for (i = bp->bio_offset / PAGE_SIZE; i <= lastp; i++) {
|
|
len = ((i == lastp) ? lastend : PAGE_SIZE) - offs;
|
|
m = vm_page_grab(sc->object, i, VM_ALLOC_NORMAL |
|
|
VM_ALLOC_RETRY);
|
|
if (bp->bio_cmd == BIO_READ) {
|
|
if (m->valid != VM_PAGE_BITS_ALL)
|
|
rv = vm_pager_get_pages(sc->object, &m, 1, 0);
|
|
if (rv == VM_PAGER_ERROR) {
|
|
vm_page_wakeup(m);
|
|
break;
|
|
} else if (rv == VM_PAGER_FAIL) {
|
|
/*
|
|
* Pager does not have the page. Zero
|
|
* the allocated page, and mark it as
|
|
* valid. Do not set dirty, the page
|
|
* can be recreated if thrown out.
|
|
*/
|
|
pmap_zero_page(m);
|
|
m->valid = VM_PAGE_BITS_ALL;
|
|
}
|
|
if ((bp->bio_flags & BIO_UNMAPPED) != 0) {
|
|
pmap_copy_pages(&m, offs, bp->bio_ma,
|
|
ma_offs, len);
|
|
} else {
|
|
physcopyout(VM_PAGE_TO_PHYS(m) + offs, p, len);
|
|
cpu_flush_dcache(p, len);
|
|
}
|
|
} else if (bp->bio_cmd == BIO_WRITE) {
|
|
if (len != PAGE_SIZE && m->valid != VM_PAGE_BITS_ALL)
|
|
rv = vm_pager_get_pages(sc->object, &m, 1, 0);
|
|
if (rv == VM_PAGER_ERROR) {
|
|
vm_page_wakeup(m);
|
|
break;
|
|
}
|
|
if ((bp->bio_flags & BIO_UNMAPPED) != 0) {
|
|
pmap_copy_pages(bp->bio_ma, ma_offs, &m,
|
|
offs, len);
|
|
} else {
|
|
physcopyin(p, VM_PAGE_TO_PHYS(m) + offs, len);
|
|
}
|
|
m->valid = VM_PAGE_BITS_ALL;
|
|
} else if (bp->bio_cmd == BIO_DELETE) {
|
|
if (len != PAGE_SIZE && m->valid != VM_PAGE_BITS_ALL)
|
|
rv = vm_pager_get_pages(sc->object, &m, 1, 0);
|
|
if (rv == VM_PAGER_ERROR) {
|
|
vm_page_wakeup(m);
|
|
break;
|
|
}
|
|
if (len != PAGE_SIZE) {
|
|
pmap_zero_page_area(m, offs, len);
|
|
vm_page_clear_dirty(m, offs, len);
|
|
m->valid = VM_PAGE_BITS_ALL;
|
|
} else
|
|
vm_pager_page_unswapped(m);
|
|
}
|
|
vm_page_wakeup(m);
|
|
vm_page_lock(m);
|
|
if (bp->bio_cmd == BIO_DELETE && len == PAGE_SIZE)
|
|
vm_page_free(m);
|
|
else
|
|
vm_page_activate(m);
|
|
vm_page_unlock(m);
|
|
if (bp->bio_cmd == BIO_WRITE)
|
|
vm_page_dirty(m);
|
|
|
|
/* Actions on further pages start at offset 0 */
|
|
p += PAGE_SIZE - offs;
|
|
offs = 0;
|
|
ma_offs += len;
|
|
}
|
|
vm_object_pip_subtract(sc->object, 1);
|
|
VM_OBJECT_WUNLOCK(sc->object);
|
|
return (rv != VM_PAGER_ERROR ? 0 : ENOSPC);
|
|
}
|
|
|
|
static void
|
|
md_kthread(void *arg)
|
|
{
|
|
struct md_s *sc;
|
|
struct bio *bp;
|
|
int error;
|
|
|
|
sc = arg;
|
|
thread_lock(curthread);
|
|
sched_prio(curthread, PRIBIO);
|
|
thread_unlock(curthread);
|
|
if (sc->type == MD_VNODE)
|
|
curthread->td_pflags |= TDP_NORUNNINGBUF;
|
|
|
|
for (;;) {
|
|
mtx_lock(&sc->queue_mtx);
|
|
if (sc->flags & MD_SHUTDOWN) {
|
|
sc->flags |= MD_EXITING;
|
|
mtx_unlock(&sc->queue_mtx);
|
|
kproc_exit(0);
|
|
}
|
|
bp = bioq_takefirst(&sc->bio_queue);
|
|
if (!bp) {
|
|
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))) ||
|
|
g_handleattr_int(bp, "GEOM::candelete", 1))
|
|
error = -1;
|
|
else
|
|
error = EOPNOTSUPP;
|
|
} else {
|
|
error = sc->start(sc, bp);
|
|
}
|
|
|
|
if (error != -1) {
|
|
bp->bio_completed = bp->bio_length;
|
|
if ((bp->bio_cmd == BIO_READ) || (bp->bio_cmd == BIO_WRITE))
|
|
devstat_end_transaction_bio(sc->devstat, bp);
|
|
g_io_deliver(bp, error);
|
|
}
|
|
}
|
|
}
|
|
|
|
static struct md_s *
|
|
mdfind(int unit)
|
|
{
|
|
struct md_s *sc;
|
|
|
|
LIST_FOREACH(sc, &md_softc_list, list) {
|
|
if (sc->unit == unit)
|
|
break;
|
|
}
|
|
return (sc);
|
|
}
|
|
|
|
static struct md_s *
|
|
mdnew(int unit, int *errp, enum md_types type)
|
|
{
|
|
struct md_s *sc;
|
|
int error;
|
|
|
|
*errp = 0;
|
|
if (unit == -1)
|
|
unit = alloc_unr(md_uh);
|
|
else
|
|
unit = alloc_unr_specific(md_uh, unit);
|
|
|
|
if (unit == -1) {
|
|
*errp = EBUSY;
|
|
return (NULL);
|
|
}
|
|
|
|
sc = (struct md_s *)malloc(sizeof *sc, M_MD, M_WAITOK | M_ZERO);
|
|
sc->type = type;
|
|
bioq_init(&sc->bio_queue);
|
|
mtx_init(&sc->queue_mtx, "md bio queue", NULL, MTX_DEF);
|
|
sc->unit = unit;
|
|
sprintf(sc->name, "md%d", unit);
|
|
LIST_INSERT_HEAD(&md_softc_list, sc, list);
|
|
error = kproc_create(md_kthread, sc, &sc->procp, 0, 0,"%s", sc->name);
|
|
if (error == 0)
|
|
return (sc);
|
|
LIST_REMOVE(sc, list);
|
|
mtx_destroy(&sc->queue_mtx);
|
|
free_unr(md_uh, sc->unit);
|
|
free(sc, M_MD);
|
|
*errp = error;
|
|
return (NULL);
|
|
}
|
|
|
|
static void
|
|
mdinit(struct md_s *sc)
|
|
{
|
|
struct g_geom *gp;
|
|
struct g_provider *pp;
|
|
|
|
g_topology_lock();
|
|
gp = g_new_geomf(&g_md_class, "md%d", sc->unit);
|
|
gp->softc = sc;
|
|
pp = g_new_providerf(gp, "md%d", sc->unit);
|
|
pp->mediasize = sc->mediasize;
|
|
pp->sectorsize = sc->sectorsize;
|
|
pp->flags |= G_PF_ACCEPT_UNMAPPED;
|
|
sc->gp = gp;
|
|
sc->pp = pp;
|
|
g_error_provider(pp, 0);
|
|
g_topology_unlock();
|
|
sc->devstat = devstat_new_entry("md", sc->unit, sc->sectorsize,
|
|
DEVSTAT_ALL_SUPPORTED, DEVSTAT_TYPE_DIRECT, DEVSTAT_PRIORITY_MAX);
|
|
}
|
|
|
|
static int
|
|
mdcreate_malloc(struct md_s *sc, struct md_ioctl *mdio)
|
|
{
|
|
uintptr_t sp;
|
|
int error;
|
|
off_t u;
|
|
|
|
error = 0;
|
|
if (mdio->md_options & ~(MD_AUTOUNIT | MD_COMPRESS | MD_RESERVE))
|
|
return (EINVAL);
|
|
if (mdio->md_sectorsize != 0 && !powerof2(mdio->md_sectorsize))
|
|
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_fwsectors != 0)
|
|
sc->fwsectors = mdio->md_fwsectors;
|
|
if (mdio->md_fwheads != 0)
|
|
sc->fwheads = mdio->md_fwheads;
|
|
sc->flags = mdio->md_options & (MD_COMPRESS | MD_FORCE);
|
|
sc->indir = dimension(sc->mediasize / sc->sectorsize);
|
|
sc->uma = uma_zcreate(sc->name, sc->sectorsize, NULL, NULL, NULL, NULL,
|
|
0x1ff, 0);
|
|
if (mdio->md_options & MD_RESERVE) {
|
|
off_t nsectors;
|
|
|
|
nsectors = sc->mediasize / sc->sectorsize;
|
|
for (u = 0; u < nsectors; u++) {
|
|
sp = (uintptr_t)uma_zalloc(sc->uma, (md_malloc_wait ?
|
|
M_WAITOK : M_NOWAIT) | M_ZERO);
|
|
if (sp != 0)
|
|
error = s_write(sc->indir, u, sp);
|
|
else
|
|
error = ENOMEM;
|
|
if (error != 0)
|
|
break;
|
|
}
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
|
|
static int
|
|
mdsetcred(struct md_s *sc, struct ucred *cred)
|
|
{
|
|
char *tmpbuf;
|
|
int error = 0;
|
|
|
|
/*
|
|
* Set credits in our softc
|
|
*/
|
|
|
|
if (sc->cred)
|
|
crfree(sc->cred);
|
|
sc->cred = crhold(cred);
|
|
|
|
/*
|
|
* Horrible kludge to establish credentials for NFS XXX.
|
|
*/
|
|
|
|
if (sc->vnode) {
|
|
struct uio auio;
|
|
struct iovec aiov;
|
|
|
|
tmpbuf = malloc(sc->sectorsize, M_TEMP, M_WAITOK);
|
|
bzero(&auio, sizeof(auio));
|
|
|
|
aiov.iov_base = tmpbuf;
|
|
aiov.iov_len = sc->sectorsize;
|
|
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);
|
|
error = VOP_READ(sc->vnode, &auio, 0, sc->cred);
|
|
VOP_UNLOCK(sc->vnode, 0);
|
|
free(tmpbuf, M_TEMP);
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
mdcreate_vnode(struct md_s *sc, struct md_ioctl *mdio, struct thread *td)
|
|
{
|
|
struct vattr vattr;
|
|
struct nameidata nd;
|
|
char *fname;
|
|
int error, flags;
|
|
|
|
/*
|
|
* Kernel-originated requests must have the filename appended
|
|
* to the mdio structure to protect against malicious software.
|
|
*/
|
|
fname = mdio->md_file;
|
|
if ((void *)fname != (void *)(mdio + 1)) {
|
|
error = copyinstr(fname, sc->file, sizeof(sc->file), NULL);
|
|
if (error != 0)
|
|
return (error);
|
|
} else
|
|
strlcpy(sc->file, fname, sizeof(sc->file));
|
|
|
|
/*
|
|
* If the user specified that this is a read only device, don't
|
|
* set the FWRITE mask before trying to open the backing store.
|
|
*/
|
|
flags = FREAD | ((mdio->md_options & MD_READONLY) ? 0 : FWRITE);
|
|
NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, sc->file, td);
|
|
error = vn_open(&nd, &flags, 0, NULL);
|
|
if (error != 0)
|
|
return (error);
|
|
NDFREE(&nd, NDF_ONLY_PNBUF);
|
|
if (nd.ni_vp->v_type != VREG) {
|
|
error = EINVAL;
|
|
goto bad;
|
|
}
|
|
error = VOP_GETATTR(nd.ni_vp, &vattr, td->td_ucred);
|
|
if (error != 0)
|
|
goto bad;
|
|
if (VOP_ISLOCKED(nd.ni_vp) != LK_EXCLUSIVE) {
|
|
vn_lock(nd.ni_vp, LK_UPGRADE | LK_RETRY);
|
|
if (nd.ni_vp->v_iflag & VI_DOOMED) {
|
|
/* Forced unmount. */
|
|
error = EBADF;
|
|
goto bad;
|
|
}
|
|
}
|
|
nd.ni_vp->v_vflag |= VV_MD;
|
|
VOP_UNLOCK(nd.ni_vp, 0);
|
|
|
|
if (mdio->md_fwsectors != 0)
|
|
sc->fwsectors = mdio->md_fwsectors;
|
|
if (mdio->md_fwheads != 0)
|
|
sc->fwheads = mdio->md_fwheads;
|
|
sc->flags = mdio->md_options & (MD_FORCE | MD_ASYNC);
|
|
if (!(flags & FWRITE))
|
|
sc->flags |= MD_READONLY;
|
|
sc->vnode = nd.ni_vp;
|
|
|
|
error = mdsetcred(sc, td->td_ucred);
|
|
if (error != 0) {
|
|
sc->vnode = NULL;
|
|
vn_lock(nd.ni_vp, LK_EXCLUSIVE | LK_RETRY);
|
|
nd.ni_vp->v_vflag &= ~VV_MD;
|
|
goto bad;
|
|
}
|
|
return (0);
|
|
bad:
|
|
VOP_UNLOCK(nd.ni_vp, 0);
|
|
(void)vn_close(nd.ni_vp, flags, td->td_ucred, td);
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
mddestroy(struct md_s *sc, struct thread *td)
|
|
{
|
|
|
|
if (sc->gp) {
|
|
sc->gp->softc = NULL;
|
|
g_topology_lock();
|
|
g_wither_geom(sc->gp, ENXIO);
|
|
g_topology_unlock();
|
|
sc->gp = NULL;
|
|
sc->pp = NULL;
|
|
}
|
|
if (sc->devstat) {
|
|
devstat_remove_entry(sc->devstat);
|
|
sc->devstat = NULL;
|
|
}
|
|
mtx_lock(&sc->queue_mtx);
|
|
sc->flags |= MD_SHUTDOWN;
|
|
wakeup(sc);
|
|
while (!(sc->flags & MD_EXITING))
|
|
msleep(sc->procp, &sc->queue_mtx, PRIBIO, "mddestroy", hz / 10);
|
|
mtx_unlock(&sc->queue_mtx);
|
|
mtx_destroy(&sc->queue_mtx);
|
|
if (sc->vnode != NULL) {
|
|
vn_lock(sc->vnode, LK_EXCLUSIVE | LK_RETRY);
|
|
sc->vnode->v_vflag &= ~VV_MD;
|
|
VOP_UNLOCK(sc->vnode, 0);
|
|
(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);
|
|
|
|
LIST_REMOVE(sc, list);
|
|
free_unr(md_uh, sc->unit);
|
|
free(sc, M_MD);
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mdresize(struct md_s *sc, struct md_ioctl *mdio)
|
|
{
|
|
int error, res;
|
|
vm_pindex_t oldpages, newpages;
|
|
|
|
switch (sc->type) {
|
|
case MD_VNODE:
|
|
break;
|
|
case MD_SWAP:
|
|
if (mdio->md_mediasize <= 0 ||
|
|
(mdio->md_mediasize % PAGE_SIZE) != 0)
|
|
return (EDOM);
|
|
oldpages = OFF_TO_IDX(round_page(sc->mediasize));
|
|
newpages = OFF_TO_IDX(round_page(mdio->md_mediasize));
|
|
if (newpages < oldpages) {
|
|
VM_OBJECT_WLOCK(sc->object);
|
|
vm_object_page_remove(sc->object, newpages, 0, 0);
|
|
swap_pager_freespace(sc->object, newpages,
|
|
oldpages - newpages);
|
|
swap_release_by_cred(IDX_TO_OFF(oldpages -
|
|
newpages), sc->cred);
|
|
sc->object->charge = IDX_TO_OFF(newpages);
|
|
sc->object->size = newpages;
|
|
VM_OBJECT_WUNLOCK(sc->object);
|
|
} else if (newpages > oldpages) {
|
|
res = swap_reserve_by_cred(IDX_TO_OFF(newpages -
|
|
oldpages), sc->cred);
|
|
if (!res)
|
|
return (ENOMEM);
|
|
if ((mdio->md_options & MD_RESERVE) ||
|
|
(sc->flags & MD_RESERVE)) {
|
|
error = swap_pager_reserve(sc->object,
|
|
oldpages, newpages - oldpages);
|
|
if (error < 0) {
|
|
swap_release_by_cred(
|
|
IDX_TO_OFF(newpages - oldpages),
|
|
sc->cred);
|
|
return (EDOM);
|
|
}
|
|
}
|
|
VM_OBJECT_WLOCK(sc->object);
|
|
sc->object->charge = IDX_TO_OFF(newpages);
|
|
sc->object->size = newpages;
|
|
VM_OBJECT_WUNLOCK(sc->object);
|
|
}
|
|
break;
|
|
default:
|
|
return (EOPNOTSUPP);
|
|
}
|
|
|
|
sc->mediasize = mdio->md_mediasize;
|
|
g_topology_lock();
|
|
g_resize_provider(sc->pp, sc->mediasize);
|
|
g_topology_unlock();
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mdcreate_swap(struct md_s *sc, struct md_ioctl *mdio, struct thread *td)
|
|
{
|
|
vm_ooffset_t npage;
|
|
int error;
|
|
|
|
/*
|
|
* Range check. Disallow negative sizes or any size less then the
|
|
* size of a page. Then round to a page.
|
|
*/
|
|
if (sc->mediasize <= 0 || (sc->mediasize % PAGE_SIZE) != 0)
|
|
return (EDOM);
|
|
|
|
/*
|
|
* Allocate an OBJT_SWAP object.
|
|
*
|
|
* Note the truncation.
|
|
*/
|
|
|
|
npage = mdio->md_mediasize / PAGE_SIZE;
|
|
if (mdio->md_fwsectors != 0)
|
|
sc->fwsectors = mdio->md_fwsectors;
|
|
if (mdio->md_fwheads != 0)
|
|
sc->fwheads = mdio->md_fwheads;
|
|
sc->object = vm_pager_allocate(OBJT_SWAP, NULL, PAGE_SIZE * npage,
|
|
VM_PROT_DEFAULT, 0, td->td_ucred);
|
|
if (sc->object == NULL)
|
|
return (ENOMEM);
|
|
sc->flags = mdio->md_options & (MD_FORCE | MD_RESERVE);
|
|
if (mdio->md_options & MD_RESERVE) {
|
|
if (swap_pager_reserve(sc->object, 0, npage) < 0) {
|
|
error = EDOM;
|
|
goto finish;
|
|
}
|
|
}
|
|
error = mdsetcred(sc, td->td_ucred);
|
|
finish:
|
|
if (error != 0) {
|
|
vm_object_deallocate(sc->object);
|
|
sc->object = NULL;
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
|
|
static int
|
|
xmdctlioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flags, struct thread *td)
|
|
{
|
|
struct md_ioctl *mdio;
|
|
struct md_s *sc;
|
|
int error, i;
|
|
unsigned sectsize;
|
|
|
|
if (md_debug)
|
|
printf("mdctlioctl(%s %lx %p %x %p)\n",
|
|
devtoname(dev), cmd, addr, flags, td);
|
|
|
|
mdio = (struct md_ioctl *)addr;
|
|
if (mdio->md_version != MDIOVERSION)
|
|
return (EINVAL);
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
error = 0;
|
|
switch (cmd) {
|
|
case MDIOCATTACH:
|
|
switch (mdio->md_type) {
|
|
case MD_MALLOC:
|
|
case MD_PRELOAD:
|
|
case MD_VNODE:
|
|
case MD_SWAP:
|
|
break;
|
|
default:
|
|
return (EINVAL);
|
|
}
|
|
if (mdio->md_sectorsize == 0)
|
|
sectsize = DEV_BSIZE;
|
|
else
|
|
sectsize = mdio->md_sectorsize;
|
|
if (sectsize > MAXPHYS || mdio->md_mediasize < sectsize)
|
|
return (EINVAL);
|
|
if (mdio->md_options & MD_AUTOUNIT)
|
|
sc = mdnew(-1, &error, mdio->md_type);
|
|
else {
|
|
if (mdio->md_unit > INT_MAX)
|
|
return (EINVAL);
|
|
sc = mdnew(mdio->md_unit, &error, mdio->md_type);
|
|
}
|
|
if (sc == NULL)
|
|
return (error);
|
|
if (mdio->md_options & MD_AUTOUNIT)
|
|
mdio->md_unit = sc->unit;
|
|
sc->mediasize = mdio->md_mediasize;
|
|
sc->sectorsize = sectsize;
|
|
error = EDOOFUS;
|
|
switch (sc->type) {
|
|
case MD_MALLOC:
|
|
sc->start = mdstart_malloc;
|
|
error = mdcreate_malloc(sc, mdio);
|
|
break;
|
|
case MD_PRELOAD:
|
|
/*
|
|
* We disallow attaching preloaded memory disks via
|
|
* ioctl. Preloaded memory disks are automatically
|
|
* attached in g_md_init().
|
|
*/
|
|
error = EOPNOTSUPP;
|
|
break;
|
|
case MD_VNODE:
|
|
sc->start = mdstart_vnode;
|
|
error = mdcreate_vnode(sc, mdio, td);
|
|
break;
|
|
case MD_SWAP:
|
|
sc->start = mdstart_swap;
|
|
error = mdcreate_swap(sc, mdio, td);
|
|
break;
|
|
}
|
|
if (error != 0) {
|
|
mddestroy(sc, td);
|
|
return (error);
|
|
}
|
|
|
|
/* Prune off any residual fractional sector */
|
|
i = sc->mediasize % sc->sectorsize;
|
|
sc->mediasize -= i;
|
|
|
|
mdinit(sc);
|
|
return (0);
|
|
case MDIOCDETACH:
|
|
if (mdio->md_mediasize != 0 ||
|
|
(mdio->md_options & ~MD_FORCE) != 0)
|
|
return (EINVAL);
|
|
|
|
sc = mdfind(mdio->md_unit);
|
|
if (sc == NULL)
|
|
return (ENOENT);
|
|
if (sc->opencount != 0 && !(sc->flags & MD_FORCE) &&
|
|
!(mdio->md_options & MD_FORCE))
|
|
return (EBUSY);
|
|
return (mddestroy(sc, td));
|
|
case MDIOCRESIZE:
|
|
if ((mdio->md_options & ~(MD_FORCE | MD_RESERVE)) != 0)
|
|
return (EINVAL);
|
|
|
|
sc = mdfind(mdio->md_unit);
|
|
if (sc == NULL)
|
|
return (ENOENT);
|
|
if (mdio->md_mediasize < sc->sectorsize)
|
|
return (EINVAL);
|
|
if (mdio->md_mediasize < sc->mediasize &&
|
|
!(sc->flags & MD_FORCE) &&
|
|
!(mdio->md_options & MD_FORCE))
|
|
return (EBUSY);
|
|
return (mdresize(sc, mdio));
|
|
case MDIOCQUERY:
|
|
sc = mdfind(mdio->md_unit);
|
|
if (sc == NULL)
|
|
return (ENOENT);
|
|
mdio->md_type = sc->type;
|
|
mdio->md_options = sc->flags;
|
|
mdio->md_mediasize = sc->mediasize;
|
|
mdio->md_sectorsize = sc->sectorsize;
|
|
if (sc->type == MD_VNODE)
|
|
error = copyout(sc->file, mdio->md_file,
|
|
strlen(sc->file) + 1);
|
|
return (error);
|
|
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);
|
|
};
|
|
}
|
|
|
|
static int
|
|
mdctlioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flags, struct thread *td)
|
|
{
|
|
int error;
|
|
|
|
sx_xlock(&md_sx);
|
|
error = xmdctlioctl(dev, cmd, addr, flags, td);
|
|
sx_xunlock(&md_sx);
|
|
return (error);
|
|
}
|
|
|
|
static void
|
|
md_preloaded(u_char *image, size_t length, const char *name)
|
|
{
|
|
struct md_s *sc;
|
|
int error;
|
|
|
|
sc = mdnew(-1, &error, MD_PRELOAD);
|
|
if (sc == NULL)
|
|
return;
|
|
sc->mediasize = length;
|
|
sc->sectorsize = DEV_BSIZE;
|
|
sc->pl_ptr = image;
|
|
sc->pl_len = length;
|
|
sc->start = mdstart_preload;
|
|
#ifdef MD_ROOT
|
|
if (sc->unit == 0)
|
|
rootdevnames[0] = MD_ROOT_FSTYPE ":/dev/md0";
|
|
#endif
|
|
mdinit(sc);
|
|
if (name != NULL) {
|
|
printf("%s%d: Preloaded image <%s> %zd bytes at %p\n",
|
|
MD_NAME, sc->unit, name, length, image);
|
|
}
|
|
}
|
|
|
|
static void
|
|
g_md_init(struct g_class *mp __unused)
|
|
{
|
|
caddr_t mod;
|
|
u_char *ptr, *name, *type;
|
|
unsigned len;
|
|
int i;
|
|
|
|
/* figure out log2(NINDIR) */
|
|
for (i = NINDIR, nshift = -1; i; nshift++)
|
|
i >>= 1;
|
|
|
|
mod = NULL;
|
|
sx_init(&md_sx, "MD config lock");
|
|
g_topology_unlock();
|
|
md_uh = new_unrhdr(0, INT_MAX, NULL);
|
|
#ifdef MD_ROOT_SIZE
|
|
sx_xlock(&md_sx);
|
|
md_preloaded(mfs_root.start, sizeof(mfs_root.start), NULL);
|
|
sx_xunlock(&md_sx);
|
|
#endif
|
|
/* XXX: are preload_* static or do they need Giant ? */
|
|
while ((mod = preload_search_next_name(mod)) != NULL) {
|
|
name = (char *)preload_search_info(mod, MODINFO_NAME);
|
|
if (name == NULL)
|
|
continue;
|
|
type = (char *)preload_search_info(mod, MODINFO_TYPE);
|
|
if (type == NULL)
|
|
continue;
|
|
if (strcmp(type, "md_image") && strcmp(type, "mfs_root"))
|
|
continue;
|
|
ptr = preload_fetch_addr(mod);
|
|
len = preload_fetch_size(mod);
|
|
if (ptr != NULL && len != 0) {
|
|
sx_xlock(&md_sx);
|
|
md_preloaded(ptr, len, name);
|
|
sx_xunlock(&md_sx);
|
|
}
|
|
}
|
|
md_vnode_pbuf_freecnt = nswbuf / 10;
|
|
status_dev = make_dev(&mdctl_cdevsw, INT_MAX, UID_ROOT, GID_WHEEL,
|
|
0600, MDCTL_NAME);
|
|
g_topology_lock();
|
|
}
|
|
|
|
static void
|
|
g_md_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp,
|
|
struct g_consumer *cp __unused, struct g_provider *pp)
|
|
{
|
|
struct md_s *mp;
|
|
char *type;
|
|
|
|
mp = gp->softc;
|
|
if (mp == NULL)
|
|
return;
|
|
|
|
switch (mp->type) {
|
|
case MD_MALLOC:
|
|
type = "malloc";
|
|
break;
|
|
case MD_PRELOAD:
|
|
type = "preload";
|
|
break;
|
|
case MD_VNODE:
|
|
type = "vnode";
|
|
break;
|
|
case MD_SWAP:
|
|
type = "swap";
|
|
break;
|
|
default:
|
|
type = "unknown";
|
|
break;
|
|
}
|
|
|
|
if (pp != NULL) {
|
|
if (indent == NULL) {
|
|
sbuf_printf(sb, " u %d", mp->unit);
|
|
sbuf_printf(sb, " s %ju", (uintmax_t) mp->sectorsize);
|
|
sbuf_printf(sb, " f %ju", (uintmax_t) mp->fwheads);
|
|
sbuf_printf(sb, " fs %ju", (uintmax_t) mp->fwsectors);
|
|
sbuf_printf(sb, " l %ju", (uintmax_t) mp->mediasize);
|
|
sbuf_printf(sb, " t %s", type);
|
|
if (mp->type == MD_VNODE && mp->vnode != NULL)
|
|
sbuf_printf(sb, " file %s", mp->file);
|
|
} else {
|
|
sbuf_printf(sb, "%s<unit>%d</unit>\n", indent,
|
|
mp->unit);
|
|
sbuf_printf(sb, "%s<sectorsize>%ju</sectorsize>\n",
|
|
indent, (uintmax_t) mp->sectorsize);
|
|
sbuf_printf(sb, "%s<fwheads>%ju</fwheads>\n",
|
|
indent, (uintmax_t) mp->fwheads);
|
|
sbuf_printf(sb, "%s<fwsectors>%ju</fwsectors>\n",
|
|
indent, (uintmax_t) mp->fwsectors);
|
|
sbuf_printf(sb, "%s<length>%ju</length>\n",
|
|
indent, (uintmax_t) mp->mediasize);
|
|
sbuf_printf(sb, "%s<compression>%s</compression>\n", indent,
|
|
(mp->flags & MD_COMPRESS) == 0 ? "off": "on");
|
|
sbuf_printf(sb, "%s<access>%s</access>\n", indent,
|
|
(mp->flags & MD_READONLY) == 0 ? "read-write":
|
|
"read-only");
|
|
sbuf_printf(sb, "%s<type>%s</type>\n", indent,
|
|
type);
|
|
if (mp->type == MD_VNODE && mp->vnode != NULL)
|
|
sbuf_printf(sb, "%s<file>%s</file>\n",
|
|
indent, mp->file);
|
|
}
|
|
}
|
|
}
|
|
|
|
static void
|
|
g_md_fini(struct g_class *mp __unused)
|
|
{
|
|
|
|
sx_destroy(&md_sx);
|
|
if (status_dev != NULL)
|
|
destroy_dev(status_dev);
|
|
delete_unrhdr(md_uh);
|
|
}
|