geom_dev.c revision 104087
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 104087 2002-09-28 11:57:20Z 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 = { 63104087Sphk /* open */ g_dev_open, 64104087Sphk /* close */ g_dev_close, 65104087Sphk /* read */ physread, 66104087Sphk /* write */ physwrite, 67104087Sphk /* ioctl */ g_dev_ioctl, 68104087Sphk /* poll */ nopoll, 69104087Sphk /* mmap */ nommap, 70104087Sphk /* strategy */ g_dev_strategy, 71104087Sphk /* name */ "g_dev", 72104087Sphk /* maj */ CDEV_MAJOR, 73104087Sphk /* dump */ nodump, 74104087Sphk /* psize */ g_dev_psize, 75104087Sphk /* flags */ D_DISK | D_CANFREE | D_TRACKCLOSE, 76104087Sphk /* kqfilter */ nokqfilter 7792108Sphk}; 7892108Sphk 7992108Sphkstatic g_taste_t g_dev_taste; 8092108Sphkstatic g_orphan_t g_dev_orphan; 8192108Sphk 8293248Sphkstatic struct g_class g_dev_class = { 8397075Sphk "DEV", 8492108Sphk g_dev_taste, 8592108Sphk NULL, 8698066Sphk G_CLASS_INITIALIZER 8792108Sphk}; 8892108Sphk 8992108Sphkstatic void 90104087Sphkg_dev_clone(void *arg __unused, char *name, int namelen __unused, dev_t *dev) 9192108Sphk{ 9292108Sphk struct g_geom *gp; 9392108Sphk 9492108Sphk if (*dev != NODEV) 9592108Sphk return; 9692108Sphk 9792108Sphk g_trace(G_T_TOPOLOGY, "g_dev_clone(%s)", name); 9898066Sphk g_waitidle(); 9992108Sphk 10092108Sphk /* XXX: can I drop Giant here ??? */ 10192108Sphk /* g_topology_lock(); */ 10293248Sphk LIST_FOREACH(gp, &g_dev_class.geom, geom) { 10392108Sphk if (strcmp(gp->name, name)) 10492108Sphk continue; 10592108Sphk *dev = gp->softc; 10692108Sphk g_trace(G_T_TOPOLOGY, "g_dev_clone(%s) = %p", name, *dev); 10792108Sphk return; 10892108Sphk } 10992108Sphk /* g_topology_unlock(); */ 11092108Sphk return; 11192108Sphk} 11292108Sphk 11392108Sphkstatic void 11492108Sphkg_dev_register_cloner(void *foo __unused) 11592108Sphk{ 11692108Sphk static int once; 11792108Sphk 11896987Sphk /* XXX: why would this happen more than once ?? */ 11992108Sphk if (!once) { 12096987Sphk EVENTHANDLER_REGISTER(dev_clone, g_dev_clone, 0, 1000); 12192108Sphk once++; 12292108Sphk } 12392108Sphk} 12492108Sphk 12592108SphkSYSINIT(geomdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE,g_dev_register_cloner,NULL); 12692108Sphk 12792108Sphkstatic struct g_geom * 12893250Sphkg_dev_taste(struct g_class *mp, struct g_provider *pp, int insist __unused) 12992108Sphk{ 13092108Sphk struct g_geom *gp; 13192108Sphk struct g_consumer *cp; 13292108Sphk static int unit; 13396987Sphk int error; 13492108Sphk dev_t dev; 13592108Sphk 13692108Sphk g_trace(G_T_TOPOLOGY, "dev_taste(%s,%s)", mp->name, pp->name); 13792108Sphk g_topology_assert(); 13892108Sphk LIST_FOREACH(cp, &pp->consumers, consumers) 13993248Sphk if (cp->geom->class == mp) 14092108Sphk return (NULL); 14192108Sphk gp = g_new_geomf(mp, pp->name); 14293776Sphk gp->orphan = g_dev_orphan; 14392108Sphk cp = g_new_consumer(gp); 14496987Sphk error = g_attach(cp, pp); 14596987Sphk KASSERT(error == 0, 14696987Sphk ("g_dev_taste(%s) failed to g_attach, err=%d", pp->name, error)); 14796987Sphk /* 14896987Sphk * XXX: I'm not 100% sure we can call make_dev(9) without Giant 14996987Sphk * yet. Once we can, we don't need to drop topology here either. 15096987Sphk */ 15192108Sphk g_topology_unlock(); 15292108Sphk mtx_lock(&Giant); 15396987Sphk dev = make_dev(&g_dev_cdevsw, unit2minor(unit++), 15492108Sphk UID_ROOT, GID_WHEEL, 0600, gp->name); 15596987Sphk mtx_unlock(&Giant); 15696987Sphk g_topology_lock(); 15796987Sphk 15892108Sphk gp->softc = dev; 15992108Sphk dev->si_drv1 = gp; 16092108Sphk dev->si_drv2 = cp; 16192108Sphk return (gp); 16292108Sphk} 16392108Sphk 16492108Sphkstatic int 16592108Sphkg_dev_open(dev_t dev, int flags, int fmt, struct thread *td) 16692108Sphk{ 16792108Sphk struct g_geom *gp; 16892108Sphk struct g_consumer *cp; 16992108Sphk int error, r, w, e; 17092108Sphk 17192108Sphk gp = dev->si_drv1; 17292108Sphk cp = dev->si_drv2; 17392108Sphk if (gp == NULL || cp == NULL) 17492108Sphk return(ENXIO); 17592108Sphk g_trace(G_T_ACCESS, "g_dev_open(%s, %d, %d, %p)", 17692108Sphk gp->name, flags, fmt, td); 17792479Sphk DROP_GIANT(); 17892108Sphk g_topology_lock(); 17992108Sphk g_silence(); 18092108Sphk r = flags & FREAD ? 1 : 0; 18192108Sphk w = flags & FWRITE ? 1 : 0; 182103004Sphk#ifdef notyet 18392108Sphk e = flags & O_EXCL ? 1 : 0; 184103004Sphk#else 185103004Sphk e = 0; 186103004Sphk#endif 18792108Sphk error = g_access_rel(cp, r, w, e); 18892108Sphk g_topology_unlock(); 18992479Sphk PICKUP_GIANT(); 19098066Sphk g_waitidle(); 19192108Sphk return(error); 19292108Sphk} 19392108Sphk 19492108Sphkstatic int 19592108Sphkg_dev_close(dev_t dev, int flags, int fmt, struct thread *td) 19692108Sphk{ 19792108Sphk struct g_geom *gp; 19892108Sphk struct g_consumer *cp; 19992108Sphk int error, r, w, e; 20092108Sphk 20192108Sphk gp = dev->si_drv1; 20292108Sphk cp = dev->si_drv2; 20392108Sphk if (gp == NULL || cp == NULL) 20492108Sphk return(ENXIO); 20592108Sphk g_trace(G_T_ACCESS, "g_dev_close(%s, %d, %d, %p)", 20692108Sphk gp->name, flags, fmt, td); 20792479Sphk DROP_GIANT(); 20892108Sphk g_topology_lock(); 20992108Sphk g_silence(); 21092108Sphk r = flags & FREAD ? -1 : 0; 21192108Sphk w = flags & FWRITE ? -1 : 0; 212103004Sphk#ifdef notyet 21392108Sphk e = flags & O_EXCL ? -1 : 0; 214103004Sphk#else 215103004Sphk e = 0; 216103004Sphk#endif 21792108Sphk error = g_access_rel(cp, r, w, e); 21892108Sphk g_topology_unlock(); 21992479Sphk PICKUP_GIANT(); 22098066Sphk g_waitidle(); 22192108Sphk return (error); 22292108Sphk} 22392108Sphk 22492108Sphkstatic int 22592108Sphkg_dev_ioctl(dev_t dev, u_long cmd, caddr_t data, int fflag, struct thread *td) 22692108Sphk{ 22795323Sphk struct g_geom *gp, *gp2; 22892108Sphk struct g_consumer *cp; 22995323Sphk struct g_provider *pp2; 23095038Sphk struct g_kerneldump kd; 23192108Sphk int i, error; 23295038Sphk u_int u; 23392403Sphk struct g_ioctl *gio; 23495323Sphk struct sbuf *usb, *sb; 23592108Sphk 23692108Sphk gp = dev->si_drv1; 23792108Sphk cp = dev->si_drv2; 23895323Sphk pp2 = cp->provider; 23995323Sphk gp2 = pp2->geom; 24092108Sphk 24192108Sphk error = 0; 24292479Sphk DROP_GIANT(); 24392403Sphk 24492698Sphk i = IOCPARM_LEN(cmd); 24592698Sphk switch (cmd) { 24692698Sphk case DIOCGSECTORSIZE: 24793250Sphk error = g_io_getattr("GEOM::sectorsize", cp, &i, data); 24892698Sphk break; 24992698Sphk case DIOCGMEDIASIZE: 25093250Sphk error = g_io_getattr("GEOM::mediasize", cp, &i, data); 25192698Sphk break; 25292698Sphk case DIOCGFWSECTORS: 25393250Sphk error = g_io_getattr("GEOM::fwsectors", cp, &i, data); 25492698Sphk break; 25592698Sphk case DIOCGFWHEADS: 25693250Sphk error = g_io_getattr("GEOM::fwheads", cp, &i, data); 25792698Sphk break; 25894287Sphk case DIOCGFRONTSTUFF: 25994287Sphk error = g_io_getattr("GEOM::frontstuff", cp, &i, data); 26094287Sphk break; 26195038Sphk case DIOCSKERNELDUMP: 26295038Sphk u = *((u_int *)data); 26395038Sphk if (!u) { 26495038Sphk set_dumper(NULL); 26595038Sphk error = 0; 26695038Sphk break; 26795038Sphk } 26895038Sphk kd.offset = 0; 26995038Sphk kd.length = OFF_MAX; 27095038Sphk i = sizeof kd; 27195038Sphk error = g_io_getattr("GEOM::kerneldump", cp, &i, &kd); 27295038Sphk if (!error) 27395038Sphk dev->si_flags |= SI_DUMPDEV; 27495038Sphk break; 27595323Sphk case GEOMGETCONF: 27695323Sphk /* we bogusly pass cp to avoid getting any consumers listed */ 27795323Sphk sb = g_conf_specific(gp2->class, gp2, pp2, cp); 27895323Sphk usb = (struct sbuf *)data; 27995323Sphk if (usb->s_size - 1 < sbuf_len(sb)) 28095323Sphk error = ENOMEM; 28195323Sphk else 28295323Sphk error = copyout(sbuf_data(sb), usb->s_buf, sbuf_len(sb) + 1); 28395323Sphk if (!error) 28495323Sphk usb->s_len = sbuf_len(sb); 28595323Sphk break; 28692698Sphk default: 28792698Sphk gio = g_malloc(sizeof *gio, M_WAITOK); 28892698Sphk gio->cmd = cmd; 28992698Sphk gio->data = data; 29092698Sphk gio->fflag = fflag; 29192698Sphk gio->td = td; 29292698Sphk i = sizeof *gio; 29392698Sphk if (cmd & IOC_IN) 29493250Sphk error = g_io_setattr("GEOM::ioctl", cp, i, gio); 29592698Sphk else 29693250Sphk error = g_io_getattr("GEOM::ioctl", cp, &i, gio); 29792698Sphk g_free(gio); 29892698Sphk break; 29992698Sphk } 30092403Sphk 30192479Sphk PICKUP_GIANT(); 30298066Sphk g_waitidle(); 30392403Sphk if (error == ENOIOCTL) { 30492403Sphk i = IOCGROUP(cmd); 30592108Sphk printf("IOCTL(0x%lx) \"%s\"", cmd, gp->name); 30692108Sphk if (i > ' ' && i <= '~') 30792108Sphk printf(" '%c'", (int)IOCGROUP(cmd)); 30892108Sphk else 30992108Sphk printf(" 0x%lx", IOCGROUP(cmd)); 31092108Sphk printf("/%ld ", cmd & 0xff); 31192108Sphk if (cmd & IOC_IN) 31292108Sphk printf("I"); 31392108Sphk if (cmd & IOC_OUT) 31492108Sphk printf("O"); 31592403Sphk printf("(%ld) = ENOIOCTL\n", IOCPARM_LEN(cmd)); 31692403Sphk error = ENOTTY; 31792108Sphk } 31892108Sphk return (error); 31992108Sphk} 32092108Sphk 32192108Sphkstatic int 32292108Sphkg_dev_psize(dev_t dev) 32392108Sphk{ 32492108Sphk struct g_consumer *cp; 32592108Sphk int i, error; 32692108Sphk off_t mediasize; 32792108Sphk 32892108Sphk cp = dev->si_drv2; 32992108Sphk 33092108Sphk i = sizeof mediasize; 33193250Sphk error = g_io_getattr("GEOM::mediasize", cp, &i, &mediasize); 33292108Sphk if (error) 33392108Sphk return (-1); 33492108Sphk return (mediasize >> DEV_BSHIFT); 33592108Sphk} 33692108Sphk 33792108Sphkstatic void 33892108Sphkg_dev_done(struct bio *bp2) 33992108Sphk{ 34092108Sphk struct bio *bp; 34192108Sphk 34292108Sphk bp = bp2->bio_linkage; 34392108Sphk bp->bio_error = bp2->bio_error; 34492108Sphk if (bp->bio_error != 0) { 34592108Sphk g_trace(G_T_BIO, "g_dev_done(%p) had error %d", 34692108Sphk bp2, bp->bio_error); 34792108Sphk bp->bio_flags |= BIO_ERROR; 34892108Sphk } else { 34992108Sphk g_trace(G_T_BIO, "g_dev_done(%p/%p) resid %ld completed %lld", 35092108Sphk bp2, bp, bp->bio_resid, bp2->bio_completed); 35192108Sphk } 35292108Sphk bp->bio_resid = bp->bio_bcount - bp2->bio_completed; 35392108Sphk g_destroy_bio(bp2); 35492108Sphk mtx_lock(&Giant); 35592108Sphk biodone(bp); 35692108Sphk mtx_unlock(&Giant); 35792108Sphk} 35892108Sphk 35992108Sphkstatic void 36092108Sphkg_dev_strategy(struct bio *bp) 36192108Sphk{ 36292108Sphk struct g_geom *gp; 36392108Sphk struct g_consumer *cp; 36492108Sphk struct bio *bp2; 36592108Sphk dev_t dev; 36692108Sphk 36792108Sphk dev = bp->bio_dev; 36892108Sphk gp = dev->si_drv1; 36992108Sphk cp = dev->si_drv2; 37092108Sphk bp2 = g_clone_bio(bp); 37192108Sphk bp2->bio_offset = (off_t)bp->bio_blkno << DEV_BSHIFT; 37292108Sphk bp2->bio_length = (off_t)bp->bio_bcount; 37392108Sphk bp2->bio_done = g_dev_done; 37492108Sphk g_trace(G_T_BIO, 37592108Sphk "g_dev_strategy(%p/%p) offset %lld length %lld data %p cmd %d", 37692108Sphk bp, bp2, bp->bio_offset, bp2->bio_length, bp2->bio_data, 37792108Sphk bp2->bio_cmd); 37892108Sphk g_io_request(bp2, cp); 37992108Sphk} 38092108Sphk 38196987Sphk/* 38296987Sphk * g_dev_orphan() 38396987Sphk * 38496987Sphk * Called from below when the provider orphaned us. It is our responsibility 38596987Sphk * to get the access counts back to zero, until we do so the stack below will 38696987Sphk * not unravel. We must clear the kernel-dump settings, if this is the 38796987Sphk * current dumpdev. We call destroy_dev(9) to send our dev_t the way of 38896987Sphk * punched cards and if we have non-zero access counts, we call down with 38996987Sphk * them negated before we detattch and selfdestruct. 39096987Sphk */ 39192108Sphk 39292108Sphkstatic void 39393250Sphkg_dev_orphan(struct g_consumer *cp) 39492108Sphk{ 39592108Sphk struct g_geom *gp; 39692108Sphk dev_t dev; 39792108Sphk 39892108Sphk gp = cp->geom; 39992108Sphk g_trace(G_T_TOPOLOGY, "g_dev_orphan(%p(%s))", cp, gp->name); 40092108Sphk g_topology_assert(); 40192108Sphk if (cp->biocount > 0) 40292108Sphk return; 40392108Sphk dev = gp->softc; 40495038Sphk if (dev->si_flags & SI_DUMPDEV) 40595038Sphk set_dumper(NULL); 40696987Sphk /* XXX: we may need Giant for now */ 40792108Sphk destroy_dev(dev); 40892108Sphk if (cp->acr > 0 || cp->acw > 0 || cp->ace > 0) 40992108Sphk g_access_rel(cp, -cp->acr, -cp->acw, -cp->ace); 41098066Sphk g_detach(cp); 41192108Sphk g_destroy_consumer(cp); 41292108Sphk g_destroy_geom(gp); 41392108Sphk} 41492108Sphk 41596987SphkDECLARE_GEOM_CLASS(g_dev_class, g_dev); 416