geom_dev.c revision 96987
192108Sphk/*- 292108Sphk * Copyright (c) 2002 Poul-Henning Kamp 392108Sphk * Copyright (c) 2002 Networks Associates Technology, Inc. 492108Sphk * All rights reserved. 592108Sphk * 692108Sphk * This software was developed for the FreeBSD Project by Poul-Henning Kamp 792108Sphk * and NAI Labs, the Security Research Division of Network Associates, Inc. 892108Sphk * under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the 992108Sphk * DARPA CHATS research program. 1092108Sphk * 1192108Sphk * Redistribution and use in source and binary forms, with or without 1292108Sphk * modification, are permitted provided that the following conditions 1392108Sphk * are met: 1492108Sphk * 1. Redistributions of source code must retain the above copyright 1592108Sphk * notice, this list of conditions and the following disclaimer. 1692108Sphk * 2. Redistributions in binary form must reproduce the above copyright 1792108Sphk * notice, this list of conditions and the following disclaimer in the 1892108Sphk * documentation and/or other materials provided with the distribution. 1992108Sphk * 3. The names of the authors may not be used to endorse or promote 2092108Sphk * products derived from this software without specific prior written 2192108Sphk * permission. 2292108Sphk * 2392108Sphk * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 2492108Sphk * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 2592108Sphk * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 2692108Sphk * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 2792108Sphk * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 2892108Sphk * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2992108Sphk * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 3092108Sphk * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 3192108Sphk * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 3292108Sphk * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 3392108Sphk * SUCH DAMAGE. 3492108Sphk * 3592108Sphk * $FreeBSD: head/sys/geom/geom_dev.c 96987 2002-05-20 10:03:15Z phk $ 3692108Sphk */ 3792108Sphk 3892108Sphk#include <sys/param.h> 3992108Sphk#include <sys/systm.h> 4092108Sphk#include <sys/malloc.h> 4192108Sphk#include <sys/kernel.h> 4292108Sphk#include <sys/conf.h> 4392108Sphk#include <sys/bio.h> 4492108Sphk#include <sys/lock.h> 4592108Sphk#include <sys/mutex.h> 4692108Sphk#include <sys/errno.h> 4792108Sphk#include <sys/time.h> 4892108Sphk#include <sys/disk.h> 4992108Sphk#include <sys/fcntl.h> 5092108Sphk#include <geom/geom.h> 5195323Sphk#include <geom/geom_int.h> 5295038Sphk#include <machine/limits.h> 5392108Sphk 5492108Sphk#define CDEV_MAJOR 4 5592108Sphk 5692108Sphkstatic d_open_t g_dev_open; 5792108Sphkstatic d_close_t g_dev_close; 5892108Sphkstatic d_strategy_t g_dev_strategy; 5992108Sphkstatic d_ioctl_t g_dev_ioctl; 6092108Sphkstatic d_psize_t g_dev_psize; 6192108Sphk 6292108Sphkstatic struct cdevsw g_dev_cdevsw = { 6392108Sphk /* open */ g_dev_open, 6492108Sphk /* close */ g_dev_close, 6592108Sphk /* read */ physread, 6692108Sphk /* write */ physwrite, 6792108Sphk /* ioctl */ g_dev_ioctl, 6892108Sphk /* poll */ nopoll, 6992108Sphk /* mmap */ nommap, 7092108Sphk /* strategy */ g_dev_strategy, 7192108Sphk /* name */ "g_dev", 7292108Sphk /* maj */ CDEV_MAJOR, 7392108Sphk /* dump */ nodump, 7492108Sphk /* psize */ g_dev_psize, 7592108Sphk /* flags */ D_DISK | D_CANFREE | D_TRACKCLOSE, 7692108Sphk}; 7792108Sphk 7892108Sphkstatic g_taste_t g_dev_taste; 7992108Sphkstatic g_orphan_t g_dev_orphan; 8092108Sphk 8193248Sphkstatic struct g_class g_dev_class = { 8293248Sphk "DEV-class", 8392108Sphk g_dev_taste, 8492108Sphk NULL, 8593248Sphk G_CLASS_INITSTUFF 8692108Sphk}; 8792108Sphk 8892108Sphkstatic void 8992108Sphkg_dev_clone(void *arg, char *name, int namelen, dev_t *dev) 9092108Sphk{ 9192108Sphk struct g_geom *gp; 9292108Sphk 9392108Sphk if (*dev != NODEV) 9492108Sphk return; 9592108Sphk 9692108Sphk g_trace(G_T_TOPOLOGY, "g_dev_clone(%s)", name); 9792108Sphk g_rattle(); 9892108Sphk 9992108Sphk /* XXX: can I drop Giant here ??? */ 10092108Sphk /* g_topology_lock(); */ 10193248Sphk LIST_FOREACH(gp, &g_dev_class.geom, geom) { 10292108Sphk if (strcmp(gp->name, name)) 10392108Sphk continue; 10492108Sphk *dev = gp->softc; 10592108Sphk g_trace(G_T_TOPOLOGY, "g_dev_clone(%s) = %p", name, *dev); 10692108Sphk return; 10792108Sphk } 10892108Sphk /* g_topology_unlock(); */ 10992108Sphk return; 11092108Sphk} 11192108Sphk 11292108Sphkstatic void 11392108Sphkg_dev_register_cloner(void *foo __unused) 11492108Sphk{ 11592108Sphk static int once; 11692108Sphk 11796987Sphk /* XXX: why would this happen more than once ?? */ 11892108Sphk if (!once) { 11996987Sphk EVENTHANDLER_REGISTER(dev_clone, g_dev_clone, 0, 1000); 12092108Sphk once++; 12192108Sphk } 12292108Sphk} 12392108Sphk 12492108SphkSYSINIT(geomdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE,g_dev_register_cloner,NULL); 12592108Sphk 12692108Sphkstatic struct g_geom * 12793250Sphkg_dev_taste(struct g_class *mp, struct g_provider *pp, int insist __unused) 12892108Sphk{ 12992108Sphk struct g_geom *gp; 13092108Sphk struct g_consumer *cp; 13192108Sphk static int unit; 13296987Sphk int error; 13392108Sphk dev_t dev; 13492108Sphk 13592108Sphk g_trace(G_T_TOPOLOGY, "dev_taste(%s,%s)", mp->name, pp->name); 13692108Sphk g_topology_assert(); 13792108Sphk LIST_FOREACH(cp, &pp->consumers, consumers) 13893248Sphk if (cp->geom->class == mp) 13992108Sphk return (NULL); 14092108Sphk gp = g_new_geomf(mp, pp->name); 14193776Sphk gp->orphan = g_dev_orphan; 14292108Sphk cp = g_new_consumer(gp); 14396987Sphk error = g_attach(cp, pp); 14496987Sphk KASSERT(error == 0, 14596987Sphk ("g_dev_taste(%s) failed to g_attach, err=%d", pp->name, error)); 14696987Sphk /* 14796987Sphk * XXX: I'm not 100% sure we can call make_dev(9) without Giant 14896987Sphk * yet. Once we can, we don't need to drop topology here either. 14996987Sphk */ 15092108Sphk g_topology_unlock(); 15192108Sphk mtx_lock(&Giant); 15296987Sphk dev = make_dev(&g_dev_cdevsw, unit2minor(unit++), 15392108Sphk UID_ROOT, GID_WHEEL, 0600, gp->name); 15496987Sphk mtx_unlock(&Giant); 15596987Sphk g_topology_lock(); 15696987Sphk 15792108Sphk gp->softc = dev; 15892108Sphk dev->si_drv1 = gp; 15992108Sphk dev->si_drv2 = cp; 16092108Sphk return (gp); 16192108Sphk} 16292108Sphk 16392108Sphkstatic int 16492108Sphkg_dev_open(dev_t dev, int flags, int fmt, struct thread *td) 16592108Sphk{ 16692108Sphk struct g_geom *gp; 16792108Sphk struct g_consumer *cp; 16892108Sphk int error, r, w, e; 16992108Sphk 17092108Sphk gp = dev->si_drv1; 17192108Sphk cp = dev->si_drv2; 17292108Sphk if (gp == NULL || cp == NULL) 17392108Sphk return(ENXIO); 17492108Sphk g_trace(G_T_ACCESS, "g_dev_open(%s, %d, %d, %p)", 17592108Sphk gp->name, flags, fmt, td); 17692479Sphk DROP_GIANT(); 17792108Sphk g_topology_lock(); 17892108Sphk g_silence(); 17992108Sphk r = flags & FREAD ? 1 : 0; 18092108Sphk w = flags & FWRITE ? 1 : 0; 18192108Sphk e = flags & O_EXCL ? 1 : 0; 18292108Sphk error = g_access_rel(cp, r, w, e); 18392108Sphk g_topology_unlock(); 18492479Sphk PICKUP_GIANT(); 18592108Sphk g_rattle(); 18692108Sphk return(error); 18792108Sphk} 18892108Sphk 18992108Sphkstatic int 19092108Sphkg_dev_close(dev_t dev, int flags, int fmt, struct thread *td) 19192108Sphk{ 19292108Sphk struct g_geom *gp; 19392108Sphk struct g_consumer *cp; 19492108Sphk int error, r, w, e; 19592108Sphk 19692108Sphk gp = dev->si_drv1; 19792108Sphk cp = dev->si_drv2; 19892108Sphk if (gp == NULL || cp == NULL) 19992108Sphk return(ENXIO); 20092108Sphk g_trace(G_T_ACCESS, "g_dev_close(%s, %d, %d, %p)", 20192108Sphk gp->name, flags, fmt, td); 20292479Sphk DROP_GIANT(); 20392108Sphk g_topology_lock(); 20492108Sphk g_silence(); 20592108Sphk r = flags & FREAD ? -1 : 0; 20692108Sphk w = flags & FWRITE ? -1 : 0; 20792108Sphk e = flags & O_EXCL ? -1 : 0; 20892108Sphk error = g_access_rel(cp, r, w, e); 20992108Sphk g_topology_unlock(); 21092479Sphk PICKUP_GIANT(); 21192108Sphk g_rattle(); 21292108Sphk return (error); 21392108Sphk} 21492108Sphk 21592108Sphkstatic int 21692108Sphkg_dev_ioctl(dev_t dev, u_long cmd, caddr_t data, int fflag, struct thread *td) 21792108Sphk{ 21895323Sphk struct g_geom *gp, *gp2; 21992108Sphk struct g_consumer *cp; 22095323Sphk struct g_provider *pp2; 22195038Sphk struct g_kerneldump kd; 22292108Sphk int i, error; 22395038Sphk u_int u; 22492403Sphk struct g_ioctl *gio; 22595323Sphk struct sbuf *usb, *sb; 22692108Sphk 22792108Sphk gp = dev->si_drv1; 22892108Sphk cp = dev->si_drv2; 22995323Sphk pp2 = cp->provider; 23095323Sphk gp2 = pp2->geom; 23192108Sphk 23292108Sphk error = 0; 23392479Sphk DROP_GIANT(); 23492403Sphk 23592698Sphk i = IOCPARM_LEN(cmd); 23692698Sphk switch (cmd) { 23792698Sphk case DIOCGSECTORSIZE: 23893250Sphk error = g_io_getattr("GEOM::sectorsize", cp, &i, data); 23992698Sphk break; 24092698Sphk case DIOCGMEDIASIZE: 24193250Sphk error = g_io_getattr("GEOM::mediasize", cp, &i, data); 24292698Sphk break; 24392698Sphk case DIOCGFWSECTORS: 24493250Sphk error = g_io_getattr("GEOM::fwsectors", cp, &i, data); 24592698Sphk break; 24692698Sphk case DIOCGFWHEADS: 24793250Sphk error = g_io_getattr("GEOM::fwheads", cp, &i, data); 24892698Sphk break; 24994287Sphk case DIOCGFRONTSTUFF: 25094287Sphk error = g_io_getattr("GEOM::frontstuff", cp, &i, data); 25194287Sphk break; 25295038Sphk case DIOCSKERNELDUMP: 25395038Sphk u = *((u_int *)data); 25495038Sphk if (!u) { 25595038Sphk set_dumper(NULL); 25695038Sphk error = 0; 25795038Sphk break; 25895038Sphk } 25995038Sphk kd.offset = 0; 26095038Sphk kd.length = OFF_MAX; 26195038Sphk i = sizeof kd; 26295038Sphk error = g_io_getattr("GEOM::kerneldump", cp, &i, &kd); 26395038Sphk if (!error) 26495038Sphk dev->si_flags |= SI_DUMPDEV; 26595038Sphk break; 26695323Sphk case GEOMGETCONF: 26795323Sphk /* we bogusly pass cp to avoid getting any consumers listed */ 26895323Sphk sb = g_conf_specific(gp2->class, gp2, pp2, cp); 26995323Sphk usb = (struct sbuf *)data; 27095323Sphk if (usb->s_size - 1 < sbuf_len(sb)) 27195323Sphk error = ENOMEM; 27295323Sphk else 27395323Sphk error = copyout(sbuf_data(sb), usb->s_buf, sbuf_len(sb) + 1); 27495323Sphk if (!error) 27595323Sphk usb->s_len = sbuf_len(sb); 27695323Sphk break; 27792698Sphk default: 27892698Sphk gio = g_malloc(sizeof *gio, M_WAITOK); 27992698Sphk gio->cmd = cmd; 28092698Sphk gio->data = data; 28192698Sphk gio->fflag = fflag; 28292698Sphk gio->td = td; 28392698Sphk i = sizeof *gio; 28492698Sphk if (cmd & IOC_IN) 28593250Sphk error = g_io_setattr("GEOM::ioctl", cp, i, gio); 28692698Sphk else 28793250Sphk error = g_io_getattr("GEOM::ioctl", cp, &i, gio); 28892698Sphk g_free(gio); 28992698Sphk break; 29092698Sphk } 29192403Sphk 29292408Sphk if (error != 0 && cmd == DIOCGDVIRGIN) { 29392408Sphk g_topology_lock(); 29493248Sphk gp = g_create_geomf("BSD-class", cp->provider, NULL); 29592408Sphk g_topology_unlock(); 29692108Sphk } 29792479Sphk PICKUP_GIANT(); 29892403Sphk g_rattle(); 29992403Sphk if (error == ENOIOCTL) { 30092403Sphk i = IOCGROUP(cmd); 30192108Sphk printf("IOCTL(0x%lx) \"%s\"", cmd, gp->name); 30292108Sphk if (i > ' ' && i <= '~') 30392108Sphk printf(" '%c'", (int)IOCGROUP(cmd)); 30492108Sphk else 30592108Sphk printf(" 0x%lx", IOCGROUP(cmd)); 30692108Sphk printf("/%ld ", cmd & 0xff); 30792108Sphk if (cmd & IOC_IN) 30892108Sphk printf("I"); 30992108Sphk if (cmd & IOC_OUT) 31092108Sphk printf("O"); 31192403Sphk printf("(%ld) = ENOIOCTL\n", IOCPARM_LEN(cmd)); 31292403Sphk error = ENOTTY; 31392108Sphk } 31492108Sphk return (error); 31592108Sphk} 31692108Sphk 31792108Sphkstatic int 31892108Sphkg_dev_psize(dev_t dev) 31992108Sphk{ 32092108Sphk struct g_consumer *cp; 32192108Sphk int i, error; 32292108Sphk off_t mediasize; 32392108Sphk 32492108Sphk cp = dev->si_drv2; 32592108Sphk 32692108Sphk i = sizeof mediasize; 32793250Sphk error = g_io_getattr("GEOM::mediasize", cp, &i, &mediasize); 32892108Sphk if (error) 32992108Sphk return (-1); 33092108Sphk return (mediasize >> DEV_BSHIFT); 33192108Sphk} 33292108Sphk 33392108Sphkstatic void 33492108Sphkg_dev_done(struct bio *bp2) 33592108Sphk{ 33692108Sphk struct bio *bp; 33792108Sphk 33892108Sphk bp = bp2->bio_linkage; 33992108Sphk bp->bio_error = bp2->bio_error; 34092108Sphk if (bp->bio_error != 0) { 34192108Sphk g_trace(G_T_BIO, "g_dev_done(%p) had error %d", 34292108Sphk bp2, bp->bio_error); 34392108Sphk bp->bio_flags |= BIO_ERROR; 34492108Sphk } else { 34592108Sphk g_trace(G_T_BIO, "g_dev_done(%p/%p) resid %ld completed %lld", 34692108Sphk bp2, bp, bp->bio_resid, bp2->bio_completed); 34792108Sphk } 34892108Sphk bp->bio_resid = bp->bio_bcount - bp2->bio_completed; 34992108Sphk g_destroy_bio(bp2); 35092108Sphk mtx_lock(&Giant); 35192108Sphk biodone(bp); 35292108Sphk mtx_unlock(&Giant); 35392108Sphk} 35492108Sphk 35592108Sphkstatic void 35692108Sphkg_dev_strategy(struct bio *bp) 35792108Sphk{ 35892108Sphk struct g_geom *gp; 35992108Sphk struct g_consumer *cp; 36092108Sphk struct bio *bp2; 36192108Sphk dev_t dev; 36292108Sphk 36392108Sphk dev = bp->bio_dev; 36492108Sphk gp = dev->si_drv1; 36592108Sphk cp = dev->si_drv2; 36692108Sphk bp2 = g_clone_bio(bp); 36792108Sphk bp2->bio_offset = (off_t)bp->bio_blkno << DEV_BSHIFT; 36892108Sphk bp2->bio_length = (off_t)bp->bio_bcount; 36992108Sphk bp2->bio_done = g_dev_done; 37092108Sphk g_trace(G_T_BIO, 37192108Sphk "g_dev_strategy(%p/%p) offset %lld length %lld data %p cmd %d", 37292108Sphk bp, bp2, bp->bio_offset, bp2->bio_length, bp2->bio_data, 37392108Sphk bp2->bio_cmd); 37492108Sphk g_io_request(bp2, cp); 37592108Sphk} 37692108Sphk 37796987Sphk/* 37896987Sphk * g_dev_orphan() 37996987Sphk * 38096987Sphk * Called from below when the provider orphaned us. It is our responsibility 38196987Sphk * to get the access counts back to zero, until we do so the stack below will 38296987Sphk * not unravel. We must clear the kernel-dump settings, if this is the 38396987Sphk * current dumpdev. We call destroy_dev(9) to send our dev_t the way of 38496987Sphk * punched cards and if we have non-zero access counts, we call down with 38596987Sphk * them negated before we detattch and selfdestruct. 38696987Sphk */ 38792108Sphk 38892108Sphkstatic void 38993250Sphkg_dev_orphan(struct g_consumer *cp) 39092108Sphk{ 39192108Sphk struct g_geom *gp; 39292108Sphk dev_t dev; 39392108Sphk 39492108Sphk gp = cp->geom; 39592108Sphk g_trace(G_T_TOPOLOGY, "g_dev_orphan(%p(%s))", cp, gp->name); 39692108Sphk g_topology_assert(); 39792108Sphk if (cp->biocount > 0) 39892108Sphk return; 39992108Sphk dev = gp->softc; 40095038Sphk if (dev->si_flags & SI_DUMPDEV) 40195038Sphk set_dumper(NULL); 40296987Sphk /* XXX: we may need Giant for now */ 40392108Sphk destroy_dev(dev); 40492108Sphk if (cp->acr > 0 || cp->acw > 0 || cp->ace > 0) 40592108Sphk g_access_rel(cp, -cp->acr, -cp->acw, -cp->ace); 40692108Sphk g_dettach(cp); 40792108Sphk g_destroy_consumer(cp); 40892108Sphk g_destroy_geom(gp); 40992108Sphk} 41092108Sphk 41196987SphkDECLARE_GEOM_CLASS(g_dev_class, g_dev); 412