geom_dev.c revision 110517
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 110517 2003-02-07 21:09:51Z phk $ 3692108Sphk */ 3792108Sphk 3892108Sphk#include <sys/param.h> 39105540Sphk#include <sys/stdint.h> 4092108Sphk#include <sys/systm.h> 4192108Sphk#include <sys/malloc.h> 4292108Sphk#include <sys/kernel.h> 4392108Sphk#include <sys/conf.h> 4492108Sphk#include <sys/bio.h> 4592108Sphk#include <sys/lock.h> 4692108Sphk#include <sys/mutex.h> 4792108Sphk#include <sys/errno.h> 4892108Sphk#include <sys/time.h> 4992108Sphk#include <sys/disk.h> 5092108Sphk#include <sys/fcntl.h> 5192108Sphk#include <geom/geom.h> 5295323Sphk#include <geom/geom_int.h> 5395038Sphk#include <machine/limits.h> 5492108Sphk 5592108Sphk#define CDEV_MAJOR 4 5692108Sphk 5792108Sphkstatic d_open_t g_dev_open; 5892108Sphkstatic d_close_t g_dev_close; 5992108Sphkstatic d_strategy_t g_dev_strategy; 6092108Sphkstatic d_ioctl_t g_dev_ioctl; 6192108Sphkstatic d_psize_t g_dev_psize; 6292108Sphk 6392108Sphkstatic struct cdevsw g_dev_cdevsw = { 64104087Sphk /* open */ g_dev_open, 65104087Sphk /* close */ g_dev_close, 66104087Sphk /* read */ physread, 67104087Sphk /* write */ physwrite, 68104087Sphk /* ioctl */ g_dev_ioctl, 69104087Sphk /* poll */ nopoll, 70104087Sphk /* mmap */ nommap, 71104087Sphk /* strategy */ g_dev_strategy, 72104087Sphk /* name */ "g_dev", 73104087Sphk /* maj */ CDEV_MAJOR, 74104087Sphk /* dump */ nodump, 75104087Sphk /* psize */ g_dev_psize, 76104087Sphk /* flags */ D_DISK | D_CANFREE | D_TRACKCLOSE, 77104087Sphk /* kqfilter */ nokqfilter 7892108Sphk}; 7992108Sphk 8092108Sphkstatic g_taste_t g_dev_taste; 8192108Sphkstatic g_orphan_t g_dev_orphan; 8292108Sphk 8393248Sphkstatic struct g_class g_dev_class = { 8497075Sphk "DEV", 8592108Sphk g_dev_taste, 8692108Sphk NULL, 8798066Sphk G_CLASS_INITIALIZER 8892108Sphk}; 8992108Sphk 90105947Sphkint 91105947Sphkg_dev_print(void) 92105947Sphk{ 93105947Sphk struct g_geom *gp; 94105947Sphk 95105947Sphk if (LIST_EMPTY(&g_dev_class.geom)) 96105947Sphk return (0); 97105947Sphk printf("List of GEOM disk devices:\n "); 98105947Sphk LIST_FOREACH(gp, &g_dev_class.geom, geom) 99105947Sphk printf(" %s", gp->name); 100105947Sphk printf("\n"); 101105947Sphk return (1); 102105947Sphk} 103105947Sphk 104108294Sphk/* 105108294Sphk * XXX: This is disgusting and wrong in every way imaginable: The only reason 106108294Sphk * XXX: we have a clone function is because of the root-mount hack we currently 107108294Sphk * XXX: employ. An improvment would be to unregister this cloner once we know 108108294Sphk * XXX: we no longer need it. Ideally, root-fs would be mounted through DEVFS 109108294Sphk * XXX: eliminating the need for this hack. 110108294Sphk */ 11192108Sphkstatic void 112104087Sphkg_dev_clone(void *arg __unused, char *name, int namelen __unused, dev_t *dev) 11392108Sphk{ 11492108Sphk struct g_geom *gp; 11592108Sphk 11692108Sphk if (*dev != NODEV) 11792108Sphk return; 11892108Sphk 11998066Sphk g_waitidle(); 12092108Sphk 12192108Sphk /* g_topology_lock(); */ 12293248Sphk LIST_FOREACH(gp, &g_dev_class.geom, geom) { 12392108Sphk if (strcmp(gp->name, name)) 12492108Sphk continue; 12592108Sphk *dev = gp->softc; 12692108Sphk g_trace(G_T_TOPOLOGY, "g_dev_clone(%s) = %p", name, *dev); 12792108Sphk return; 12892108Sphk } 12992108Sphk /* g_topology_unlock(); */ 13092108Sphk return; 13192108Sphk} 13292108Sphk 13392108Sphkstatic void 13492108Sphkg_dev_register_cloner(void *foo __unused) 13592108Sphk{ 13692108Sphk static int once; 13792108Sphk 13896987Sphk /* XXX: why would this happen more than once ?? */ 13992108Sphk if (!once) { 14096987Sphk EVENTHANDLER_REGISTER(dev_clone, g_dev_clone, 0, 1000); 14192108Sphk once++; 14292108Sphk } 14392108Sphk} 14492108Sphk 14592108SphkSYSINIT(geomdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE,g_dev_register_cloner,NULL); 14692108Sphk 14792108Sphkstatic struct g_geom * 14893250Sphkg_dev_taste(struct g_class *mp, struct g_provider *pp, int insist __unused) 14992108Sphk{ 15092108Sphk struct g_geom *gp; 15192108Sphk struct g_consumer *cp; 15292108Sphk static int unit; 15396987Sphk int error; 15492108Sphk dev_t dev; 15592108Sphk 15692108Sphk g_trace(G_T_TOPOLOGY, "dev_taste(%s,%s)", mp->name, pp->name); 15792108Sphk g_topology_assert(); 15892108Sphk LIST_FOREACH(cp, &pp->consumers, consumers) 15993248Sphk if (cp->geom->class == mp) 16092108Sphk return (NULL); 16192108Sphk gp = g_new_geomf(mp, pp->name); 16293776Sphk gp->orphan = g_dev_orphan; 16392108Sphk cp = g_new_consumer(gp); 16496987Sphk error = g_attach(cp, pp); 16596987Sphk KASSERT(error == 0, 16696987Sphk ("g_dev_taste(%s) failed to g_attach, err=%d", pp->name, error)); 16796987Sphk /* 16896987Sphk * XXX: I'm not 100% sure we can call make_dev(9) without Giant 16996987Sphk * yet. Once we can, we don't need to drop topology here either. 17096987Sphk */ 17192108Sphk g_topology_unlock(); 17292108Sphk mtx_lock(&Giant); 17396987Sphk dev = make_dev(&g_dev_cdevsw, unit2minor(unit++), 174104316Sphk UID_ROOT, GID_OPERATOR, 0640, gp->name); 17596987Sphk mtx_unlock(&Giant); 17696987Sphk g_topology_lock(); 17796987Sphk 17892108Sphk gp->softc = dev; 17992108Sphk dev->si_drv1 = gp; 18092108Sphk dev->si_drv2 = cp; 18192108Sphk return (gp); 18292108Sphk} 18392108Sphk 18492108Sphkstatic int 18592108Sphkg_dev_open(dev_t dev, int flags, int fmt, struct thread *td) 18692108Sphk{ 18792108Sphk struct g_geom *gp; 18892108Sphk struct g_consumer *cp; 18992108Sphk int error, r, w, e; 19092108Sphk 19192108Sphk gp = dev->si_drv1; 19292108Sphk cp = dev->si_drv2; 19392108Sphk if (gp == NULL || cp == NULL) 19492108Sphk return(ENXIO); 19592108Sphk g_trace(G_T_ACCESS, "g_dev_open(%s, %d, %d, %p)", 19692108Sphk gp->name, flags, fmt, td); 19792479Sphk DROP_GIANT(); 19892108Sphk g_topology_lock(); 19992108Sphk r = flags & FREAD ? 1 : 0; 20092108Sphk w = flags & FWRITE ? 1 : 0; 201103004Sphk#ifdef notyet 20292108Sphk e = flags & O_EXCL ? 1 : 0; 203103004Sphk#else 204103004Sphk e = 0; 205103004Sphk#endif 20692108Sphk error = g_access_rel(cp, r, w, e); 20792108Sphk g_topology_unlock(); 20892479Sphk PICKUP_GIANT(); 20998066Sphk g_waitidle(); 210108552Sphk dev->si_bsize_phys = cp->provider->sectorsize; 21192108Sphk return(error); 21292108Sphk} 21392108Sphk 21492108Sphkstatic int 21592108Sphkg_dev_close(dev_t dev, int flags, int fmt, struct thread *td) 21692108Sphk{ 21792108Sphk struct g_geom *gp; 21892108Sphk struct g_consumer *cp; 21992108Sphk int error, r, w, e; 22092108Sphk 22192108Sphk gp = dev->si_drv1; 22292108Sphk cp = dev->si_drv2; 22392108Sphk if (gp == NULL || cp == NULL) 22492108Sphk return(ENXIO); 22592108Sphk g_trace(G_T_ACCESS, "g_dev_close(%s, %d, %d, %p)", 22692108Sphk gp->name, flags, fmt, td); 22792479Sphk DROP_GIANT(); 22892108Sphk g_topology_lock(); 22992108Sphk r = flags & FREAD ? -1 : 0; 23092108Sphk w = flags & FWRITE ? -1 : 0; 231103004Sphk#ifdef notyet 23292108Sphk e = flags & O_EXCL ? -1 : 0; 233103004Sphk#else 234103004Sphk e = 0; 235103004Sphk#endif 23692108Sphk error = g_access_rel(cp, r, w, e); 23792108Sphk g_topology_unlock(); 23892479Sphk PICKUP_GIANT(); 23998066Sphk g_waitidle(); 24092108Sphk return (error); 24192108Sphk} 24292108Sphk 24392108Sphkstatic int 24492108Sphkg_dev_ioctl(dev_t dev, u_long cmd, caddr_t data, int fflag, struct thread *td) 24592108Sphk{ 24695323Sphk struct g_geom *gp, *gp2; 24792108Sphk struct g_consumer *cp; 24895323Sphk struct g_provider *pp2; 24995038Sphk struct g_kerneldump kd; 25092108Sphk int i, error; 25195038Sphk u_int u; 25292403Sphk struct g_ioctl *gio; 25392108Sphk 25492108Sphk gp = dev->si_drv1; 25592108Sphk cp = dev->si_drv2; 25695323Sphk pp2 = cp->provider; 25795323Sphk gp2 = pp2->geom; 258104602Sphk gio = NULL; 25992108Sphk 26092108Sphk error = 0; 26192479Sphk DROP_GIANT(); 26292403Sphk 263109253Sphk gio = NULL; 26492698Sphk i = IOCPARM_LEN(cmd); 26592698Sphk switch (cmd) { 26692698Sphk case DIOCGSECTORSIZE: 267105551Sphk *(u_int *)data = cp->provider->sectorsize; 268105551Sphk if (*(u_int *)data == 0) 269105180Snjl error = ENOENT; 27092698Sphk break; 27192698Sphk case DIOCGMEDIASIZE: 272105551Sphk *(off_t *)data = cp->provider->mediasize; 273105551Sphk if (*(off_t *)data == 0) 274105180Snjl error = ENOENT; 27592698Sphk break; 27692698Sphk case DIOCGFWSECTORS: 27793250Sphk error = g_io_getattr("GEOM::fwsectors", cp, &i, data); 278105180Snjl if (error == 0 && *(u_int *)data == 0) 279105180Snjl error = ENOENT; 28092698Sphk break; 28192698Sphk case DIOCGFWHEADS: 28293250Sphk error = g_io_getattr("GEOM::fwheads", cp, &i, data); 283105180Snjl if (error == 0 && *(u_int *)data == 0) 284105180Snjl error = ENOENT; 28592698Sphk break; 28694287Sphk case DIOCGFRONTSTUFF: 28794287Sphk error = g_io_getattr("GEOM::frontstuff", cp, &i, data); 28894287Sphk break; 28995038Sphk case DIOCSKERNELDUMP: 29095038Sphk u = *((u_int *)data); 29195038Sphk if (!u) { 29295038Sphk set_dumper(NULL); 29395038Sphk error = 0; 29495038Sphk break; 29595038Sphk } 29695038Sphk kd.offset = 0; 29795038Sphk kd.length = OFF_MAX; 29895038Sphk i = sizeof kd; 29995038Sphk error = g_io_getattr("GEOM::kerneldump", cp, &i, &kd); 30095038Sphk if (!error) 30195038Sphk dev->si_flags |= SI_DUMPDEV; 30295038Sphk break; 303104602Sphk 30492698Sphk default: 305109623Salfred gio = g_malloc(sizeof *gio, M_ZERO); 30692698Sphk gio->cmd = cmd; 30792698Sphk gio->data = data; 30892698Sphk gio->fflag = fflag; 30992698Sphk gio->td = td; 31092698Sphk i = sizeof *gio; 311109176Sphk /* 312109176Sphk * We always issue ioctls as getattr since the direction of data 313109176Sphk * movement in ioctl is no indication of the ioctl being a "set" 314109176Sphk * or "get" type ioctl or if such simplistic terms even apply 315109176Sphk */ 316109176Sphk error = g_io_getattr("GEOM::ioctl", cp, &i, gio); 31792698Sphk break; 31892698Sphk } 31992403Sphk 32092479Sphk PICKUP_GIANT(); 321104602Sphk if (error == EDIRIOCTL) { 322104602Sphk KASSERT(gio != NULL, ("NULL gio but EDIRIOCTL")); 323104602Sphk KASSERT(gio->func != NULL, ("NULL function but EDIRIOCTL")); 324104602Sphk error = (gio->func)(gio->dev, cmd, data, fflag, td); 325104602Sphk } 32698066Sphk g_waitidle(); 327109253Sphk if (gio != NULL && (error == EOPNOTSUPP || error == ENOIOCTL)) { 328104357Sphk if (g_debugflags & G_T_TOPOLOGY) { 329104357Sphk i = IOCGROUP(cmd); 330104357Sphk printf("IOCTL(0x%lx) \"%s\"", cmd, gp->name); 331104357Sphk if (i > ' ' && i <= '~') 332104357Sphk printf(" '%c'", (int)IOCGROUP(cmd)); 333104357Sphk else 334104357Sphk printf(" 0x%lx", IOCGROUP(cmd)); 335104357Sphk printf("/%ld ", cmd & 0xff); 336104357Sphk if (cmd & IOC_IN) 337104357Sphk printf("I"); 338104357Sphk if (cmd & IOC_OUT) 339104357Sphk printf("O"); 340104357Sphk printf("(%ld) = ENOIOCTL\n", IOCPARM_LEN(cmd)); 341104357Sphk } 34292403Sphk error = ENOTTY; 34392108Sphk } 344109253Sphk if (gio != NULL) 345109253Sphk g_free(gio); 34692108Sphk return (error); 34792108Sphk} 34892108Sphk 34992108Sphkstatic int 35092108Sphkg_dev_psize(dev_t dev) 35192108Sphk{ 35292108Sphk struct g_consumer *cp; 35392108Sphk off_t mediasize; 35492108Sphk 35592108Sphk cp = dev->si_drv2; 35692108Sphk 357105551Sphk mediasize = cp->provider->mediasize; 35892108Sphk return (mediasize >> DEV_BSHIFT); 35992108Sphk} 36092108Sphk 36192108Sphkstatic void 36292108Sphkg_dev_done(struct bio *bp2) 36392108Sphk{ 36492108Sphk struct bio *bp; 36592108Sphk 366110517Sphk bp = bp2->bio_parent; 36792108Sphk bp->bio_error = bp2->bio_error; 36892108Sphk if (bp->bio_error != 0) { 36992108Sphk g_trace(G_T_BIO, "g_dev_done(%p) had error %d", 37092108Sphk bp2, bp->bio_error); 37192108Sphk bp->bio_flags |= BIO_ERROR; 37292108Sphk } else { 373105540Sphk g_trace(G_T_BIO, "g_dev_done(%p/%p) resid %ld completed %jd", 374105540Sphk bp2, bp, bp->bio_resid, (intmax_t)bp2->bio_completed); 37592108Sphk } 37692108Sphk bp->bio_resid = bp->bio_bcount - bp2->bio_completed; 37792108Sphk g_destroy_bio(bp2); 37892108Sphk mtx_lock(&Giant); 37992108Sphk biodone(bp); 38092108Sphk mtx_unlock(&Giant); 38192108Sphk} 38292108Sphk 38392108Sphkstatic void 38492108Sphkg_dev_strategy(struct bio *bp) 38592108Sphk{ 38692108Sphk struct g_geom *gp; 38792108Sphk struct g_consumer *cp; 38892108Sphk struct bio *bp2; 38992108Sphk dev_t dev; 39092108Sphk 391106300Sphk KASSERT(bp->bio_cmd == BIO_READ || 392106300Sphk bp->bio_cmd == BIO_WRITE || 393106300Sphk bp->bio_cmd == BIO_DELETE, 394106300Sphk ("Wrong bio_cmd bio=%p cmd=%d", bp, bp->bio_cmd)); 39592108Sphk dev = bp->bio_dev; 39692108Sphk gp = dev->si_drv1; 39792108Sphk cp = dev->si_drv2; 39892108Sphk bp2 = g_clone_bio(bp); 399107834Sphk KASSERT(bp2 != NULL, ("XXX: ENOMEM in a bad place")); 40092108Sphk bp2->bio_offset = (off_t)bp->bio_blkno << DEV_BSHIFT; 401107834Sphk KASSERT(bp2->bio_offset >= 0, 402107834Sphk ("Negative bio_offset (%jd) on bio %p", 403107834Sphk (intmax_t)bp2->bio_offset, bp)); 40492108Sphk bp2->bio_length = (off_t)bp->bio_bcount; 40592108Sphk bp2->bio_done = g_dev_done; 40692108Sphk g_trace(G_T_BIO, 407105540Sphk "g_dev_strategy(%p/%p) offset %jd length %jd data %p cmd %d", 408105540Sphk bp, bp2, (intmax_t)bp->bio_offset, (intmax_t)bp2->bio_length, 409105540Sphk bp2->bio_data, bp2->bio_cmd); 41092108Sphk g_io_request(bp2, cp); 41192108Sphk} 41292108Sphk 41396987Sphk/* 41496987Sphk * g_dev_orphan() 41596987Sphk * 41696987Sphk * Called from below when the provider orphaned us. It is our responsibility 41796987Sphk * to get the access counts back to zero, until we do so the stack below will 41896987Sphk * not unravel. We must clear the kernel-dump settings, if this is the 41996987Sphk * current dumpdev. We call destroy_dev(9) to send our dev_t the way of 42096987Sphk * punched cards and if we have non-zero access counts, we call down with 42196987Sphk * them negated before we detattch and selfdestruct. 42296987Sphk */ 42392108Sphk 42492108Sphkstatic void 42593250Sphkg_dev_orphan(struct g_consumer *cp) 42692108Sphk{ 42792108Sphk struct g_geom *gp; 42892108Sphk dev_t dev; 42992108Sphk 43092108Sphk gp = cp->geom; 43192108Sphk g_trace(G_T_TOPOLOGY, "g_dev_orphan(%p(%s))", cp, gp->name); 43292108Sphk g_topology_assert(); 43392108Sphk if (cp->biocount > 0) 43492108Sphk return; 43592108Sphk dev = gp->softc; 43695038Sphk if (dev->si_flags & SI_DUMPDEV) 43795038Sphk set_dumper(NULL); 43896987Sphk /* XXX: we may need Giant for now */ 43992108Sphk destroy_dev(dev); 44092108Sphk if (cp->acr > 0 || cp->acw > 0 || cp->ace > 0) 44192108Sphk g_access_rel(cp, -cp->acr, -cp->acw, -cp->ace); 44298066Sphk g_detach(cp); 44392108Sphk g_destroy_consumer(cp); 44492108Sphk g_destroy_geom(gp); 44592108Sphk} 44692108Sphk 44796987SphkDECLARE_GEOM_CLASS(g_dev_class, g_dev); 448