geom_dev.c revision 111815
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 111815 2003-03-03 12:15:54Z 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> 53110541Sphk#include <geom/geom_stats.h> 5495038Sphk#include <machine/limits.h> 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; 6092108Sphk 6192108Sphkstatic struct cdevsw g_dev_cdevsw = { 62111815Sphk .d_open = g_dev_open, 63111815Sphk .d_close = g_dev_close, 64111815Sphk .d_read = physread, 65111815Sphk .d_write = physwrite, 66111815Sphk .d_ioctl = g_dev_ioctl, 67111815Sphk .d_strategy = g_dev_strategy, 68111815Sphk .d_name = "g_dev", 69111815Sphk .d_maj = GEOM_MAJOR, 70111815Sphk .d_flags = D_DISK | D_TRACKCLOSE, 7192108Sphk}; 7292108Sphk 7392108Sphkstatic g_taste_t g_dev_taste; 7492108Sphkstatic g_orphan_t g_dev_orphan; 7592108Sphk 7693248Sphkstatic struct g_class g_dev_class = { 7797075Sphk "DEV", 7892108Sphk g_dev_taste, 7992108Sphk NULL, 8098066Sphk G_CLASS_INITIALIZER 8192108Sphk}; 8292108Sphk 83105947Sphkint 84105947Sphkg_dev_print(void) 85105947Sphk{ 86105947Sphk struct g_geom *gp; 87105947Sphk 88105947Sphk if (LIST_EMPTY(&g_dev_class.geom)) 89105947Sphk return (0); 90105947Sphk printf("List of GEOM disk devices:\n "); 91105947Sphk LIST_FOREACH(gp, &g_dev_class.geom, geom) 92105947Sphk printf(" %s", gp->name); 93105947Sphk printf("\n"); 94105947Sphk return (1); 95105947Sphk} 96105947Sphk 97108294Sphk/* 98108294Sphk * XXX: This is disgusting and wrong in every way imaginable: The only reason 99108294Sphk * XXX: we have a clone function is because of the root-mount hack we currently 100108294Sphk * XXX: employ. An improvment would be to unregister this cloner once we know 101108294Sphk * XXX: we no longer need it. Ideally, root-fs would be mounted through DEVFS 102108294Sphk * XXX: eliminating the need for this hack. 103108294Sphk */ 10492108Sphkstatic void 105104087Sphkg_dev_clone(void *arg __unused, char *name, int namelen __unused, dev_t *dev) 10692108Sphk{ 10792108Sphk struct g_geom *gp; 10892108Sphk 10992108Sphk if (*dev != NODEV) 11092108Sphk return; 11192108Sphk 11298066Sphk g_waitidle(); 11392108Sphk 11492108Sphk /* g_topology_lock(); */ 11593248Sphk LIST_FOREACH(gp, &g_dev_class.geom, geom) { 11692108Sphk if (strcmp(gp->name, name)) 11792108Sphk continue; 11892108Sphk *dev = gp->softc; 11992108Sphk g_trace(G_T_TOPOLOGY, "g_dev_clone(%s) = %p", name, *dev); 12092108Sphk return; 12192108Sphk } 12292108Sphk /* g_topology_unlock(); */ 12392108Sphk return; 12492108Sphk} 12592108Sphk 12692108Sphkstatic void 12792108Sphkg_dev_register_cloner(void *foo __unused) 12892108Sphk{ 12992108Sphk static int once; 13092108Sphk 13196987Sphk /* XXX: why would this happen more than once ?? */ 13292108Sphk if (!once) { 13396987Sphk EVENTHANDLER_REGISTER(dev_clone, g_dev_clone, 0, 1000); 13492108Sphk once++; 13592108Sphk } 13692108Sphk} 13792108Sphk 13892108SphkSYSINIT(geomdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE,g_dev_register_cloner,NULL); 13992108Sphk 14092108Sphkstatic struct g_geom * 14193250Sphkg_dev_taste(struct g_class *mp, struct g_provider *pp, int insist __unused) 14292108Sphk{ 14392108Sphk struct g_geom *gp; 14492108Sphk struct g_consumer *cp; 145110540Sphk static int unit = GEOM_MINOR_PROVIDERS; 14696987Sphk int error; 14792108Sphk dev_t dev; 14892108Sphk 14992108Sphk g_trace(G_T_TOPOLOGY, "dev_taste(%s,%s)", mp->name, pp->name); 15092108Sphk g_topology_assert(); 15192108Sphk LIST_FOREACH(cp, &pp->consumers, consumers) 15293248Sphk if (cp->geom->class == mp) 15392108Sphk return (NULL); 15492108Sphk gp = g_new_geomf(mp, pp->name); 15593776Sphk gp->orphan = g_dev_orphan; 15692108Sphk cp = g_new_consumer(gp); 15796987Sphk error = g_attach(cp, pp); 15896987Sphk KASSERT(error == 0, 15996987Sphk ("g_dev_taste(%s) failed to g_attach, err=%d", pp->name, error)); 16096987Sphk /* 16196987Sphk * XXX: I'm not 100% sure we can call make_dev(9) without Giant 16296987Sphk * yet. Once we can, we don't need to drop topology here either. 16396987Sphk */ 16492108Sphk g_topology_unlock(); 16592108Sphk mtx_lock(&Giant); 16696987Sphk dev = make_dev(&g_dev_cdevsw, unit2minor(unit++), 167104316Sphk UID_ROOT, GID_OPERATOR, 0640, gp->name); 168110700Sphk if (pp->flags & G_PF_CANDELETE) 169110700Sphk dev->si_flags |= SI_CANDELETE; 17096987Sphk mtx_unlock(&Giant); 17196987Sphk g_topology_lock(); 172110728Sphk dev->si_iosize_max = MAXPHYS; 173110710Sphk dev->si_stripesize = pp->stripesize; 174110710Sphk dev->si_stripeoffset = pp->stripeoffset; 17592108Sphk gp->softc = dev; 17692108Sphk dev->si_drv1 = gp; 17792108Sphk dev->si_drv2 = cp; 17892108Sphk return (gp); 17992108Sphk} 18092108Sphk 18192108Sphkstatic int 18292108Sphkg_dev_open(dev_t dev, int flags, int fmt, struct thread *td) 18392108Sphk{ 18492108Sphk struct g_geom *gp; 18592108Sphk struct g_consumer *cp; 18692108Sphk int error, r, w, e; 18792108Sphk 18892108Sphk gp = dev->si_drv1; 18992108Sphk cp = dev->si_drv2; 19092108Sphk if (gp == NULL || cp == NULL) 19192108Sphk return(ENXIO); 19292108Sphk g_trace(G_T_ACCESS, "g_dev_open(%s, %d, %d, %p)", 19392108Sphk gp->name, flags, fmt, td); 19492479Sphk DROP_GIANT(); 19592108Sphk g_topology_lock(); 19692108Sphk r = flags & FREAD ? 1 : 0; 19792108Sphk w = flags & FWRITE ? 1 : 0; 198103004Sphk#ifdef notyet 19992108Sphk e = flags & O_EXCL ? 1 : 0; 200103004Sphk#else 201103004Sphk e = 0; 202103004Sphk#endif 20392108Sphk error = g_access_rel(cp, r, w, e); 20492108Sphk g_topology_unlock(); 20592479Sphk PICKUP_GIANT(); 20698066Sphk g_waitidle(); 207108552Sphk dev->si_bsize_phys = cp->provider->sectorsize; 20892108Sphk return(error); 20992108Sphk} 21092108Sphk 21192108Sphkstatic int 21292108Sphkg_dev_close(dev_t dev, int flags, int fmt, struct thread *td) 21392108Sphk{ 21492108Sphk struct g_geom *gp; 21592108Sphk struct g_consumer *cp; 21692108Sphk int error, r, w, e; 21792108Sphk 21892108Sphk gp = dev->si_drv1; 21992108Sphk cp = dev->si_drv2; 22092108Sphk if (gp == NULL || cp == NULL) 22192108Sphk return(ENXIO); 22292108Sphk g_trace(G_T_ACCESS, "g_dev_close(%s, %d, %d, %p)", 22392108Sphk gp->name, flags, fmt, td); 22492479Sphk DROP_GIANT(); 22592108Sphk g_topology_lock(); 22692108Sphk r = flags & FREAD ? -1 : 0; 22792108Sphk w = flags & FWRITE ? -1 : 0; 228103004Sphk#ifdef notyet 22992108Sphk e = flags & O_EXCL ? -1 : 0; 230103004Sphk#else 231103004Sphk e = 0; 232103004Sphk#endif 23392108Sphk error = g_access_rel(cp, r, w, e); 23492108Sphk g_topology_unlock(); 23592479Sphk PICKUP_GIANT(); 23698066Sphk g_waitidle(); 23792108Sphk return (error); 23892108Sphk} 23992108Sphk 24092108Sphkstatic int 24192108Sphkg_dev_ioctl(dev_t dev, u_long cmd, caddr_t data, int fflag, struct thread *td) 24292108Sphk{ 24395323Sphk struct g_geom *gp, *gp2; 24492108Sphk struct g_consumer *cp; 24595323Sphk struct g_provider *pp2; 24695038Sphk struct g_kerneldump kd; 24792108Sphk int i, error; 24895038Sphk u_int u; 24992403Sphk struct g_ioctl *gio; 25092108Sphk 25192108Sphk gp = dev->si_drv1; 25292108Sphk cp = dev->si_drv2; 25395323Sphk pp2 = cp->provider; 25495323Sphk gp2 = pp2->geom; 255104602Sphk gio = NULL; 25692108Sphk 25792108Sphk error = 0; 25892479Sphk DROP_GIANT(); 25992403Sphk 260109253Sphk gio = NULL; 26192698Sphk i = IOCPARM_LEN(cmd); 26292698Sphk switch (cmd) { 26392698Sphk case DIOCGSECTORSIZE: 264105551Sphk *(u_int *)data = cp->provider->sectorsize; 265105551Sphk if (*(u_int *)data == 0) 266105180Snjl error = ENOENT; 26792698Sphk break; 26892698Sphk case DIOCGMEDIASIZE: 269105551Sphk *(off_t *)data = cp->provider->mediasize; 270105551Sphk if (*(off_t *)data == 0) 271105180Snjl error = ENOENT; 27292698Sphk break; 27392698Sphk case DIOCGFWSECTORS: 27493250Sphk error = g_io_getattr("GEOM::fwsectors", cp, &i, data); 275105180Snjl if (error == 0 && *(u_int *)data == 0) 276105180Snjl error = ENOENT; 27792698Sphk break; 27892698Sphk case DIOCGFWHEADS: 27993250Sphk error = g_io_getattr("GEOM::fwheads", cp, &i, data); 280105180Snjl if (error == 0 && *(u_int *)data == 0) 281105180Snjl error = ENOENT; 28292698Sphk break; 28394287Sphk case DIOCGFRONTSTUFF: 28494287Sphk error = g_io_getattr("GEOM::frontstuff", cp, &i, data); 28594287Sphk break; 28695038Sphk case DIOCSKERNELDUMP: 28795038Sphk u = *((u_int *)data); 28895038Sphk if (!u) { 28995038Sphk set_dumper(NULL); 29095038Sphk error = 0; 29195038Sphk break; 29295038Sphk } 29395038Sphk kd.offset = 0; 29495038Sphk kd.length = OFF_MAX; 29595038Sphk i = sizeof kd; 29695038Sphk error = g_io_getattr("GEOM::kerneldump", cp, &i, &kd); 29795038Sphk if (!error) 29895038Sphk dev->si_flags |= SI_DUMPDEV; 29995038Sphk break; 300104602Sphk 30192698Sphk default: 302111119Simp gio = g_malloc(sizeof *gio, M_WAITOK | M_ZERO); 30392698Sphk gio->cmd = cmd; 30492698Sphk gio->data = data; 30592698Sphk gio->fflag = fflag; 30692698Sphk gio->td = td; 30792698Sphk i = sizeof *gio; 308109176Sphk /* 309109176Sphk * We always issue ioctls as getattr since the direction of data 310109176Sphk * movement in ioctl is no indication of the ioctl being a "set" 311109176Sphk * or "get" type ioctl or if such simplistic terms even apply 312109176Sphk */ 313109176Sphk error = g_io_getattr("GEOM::ioctl", cp, &i, gio); 31492698Sphk break; 31592698Sphk } 31692403Sphk 31792479Sphk PICKUP_GIANT(); 318104602Sphk if (error == EDIRIOCTL) { 319104602Sphk KASSERT(gio != NULL, ("NULL gio but EDIRIOCTL")); 320104602Sphk KASSERT(gio->func != NULL, ("NULL function but EDIRIOCTL")); 321104602Sphk error = (gio->func)(gio->dev, cmd, data, fflag, td); 322104602Sphk } 32398066Sphk g_waitidle(); 324109253Sphk if (gio != NULL && (error == EOPNOTSUPP || error == ENOIOCTL)) { 325104357Sphk if (g_debugflags & G_T_TOPOLOGY) { 326104357Sphk i = IOCGROUP(cmd); 327104357Sphk printf("IOCTL(0x%lx) \"%s\"", cmd, gp->name); 328104357Sphk if (i > ' ' && i <= '~') 329104357Sphk printf(" '%c'", (int)IOCGROUP(cmd)); 330104357Sphk else 331104357Sphk printf(" 0x%lx", IOCGROUP(cmd)); 332104357Sphk printf("/%ld ", cmd & 0xff); 333104357Sphk if (cmd & IOC_IN) 334104357Sphk printf("I"); 335104357Sphk if (cmd & IOC_OUT) 336104357Sphk printf("O"); 337104357Sphk printf("(%ld) = ENOIOCTL\n", IOCPARM_LEN(cmd)); 338104357Sphk } 33992403Sphk error = ENOTTY; 34092108Sphk } 341109253Sphk if (gio != NULL) 342109253Sphk g_free(gio); 34392108Sphk return (error); 34492108Sphk} 34592108Sphk 34692108Sphkstatic void 34792108Sphkg_dev_done(struct bio *bp2) 34892108Sphk{ 34992108Sphk struct bio *bp; 35092108Sphk 351110517Sphk bp = bp2->bio_parent; 35292108Sphk bp->bio_error = bp2->bio_error; 35392108Sphk if (bp->bio_error != 0) { 35492108Sphk g_trace(G_T_BIO, "g_dev_done(%p) had error %d", 35592108Sphk bp2, bp->bio_error); 35692108Sphk bp->bio_flags |= BIO_ERROR; 35792108Sphk } else { 358105540Sphk g_trace(G_T_BIO, "g_dev_done(%p/%p) resid %ld completed %jd", 359105540Sphk bp2, bp, bp->bio_resid, (intmax_t)bp2->bio_completed); 36092108Sphk } 36192108Sphk bp->bio_resid = bp->bio_bcount - bp2->bio_completed; 36292108Sphk g_destroy_bio(bp2); 36392108Sphk mtx_lock(&Giant); 36492108Sphk biodone(bp); 36592108Sphk mtx_unlock(&Giant); 36692108Sphk} 36792108Sphk 36892108Sphkstatic void 36992108Sphkg_dev_strategy(struct bio *bp) 37092108Sphk{ 37192108Sphk struct g_geom *gp; 37292108Sphk struct g_consumer *cp; 37392108Sphk struct bio *bp2; 37492108Sphk dev_t dev; 37592108Sphk 376106300Sphk KASSERT(bp->bio_cmd == BIO_READ || 377106300Sphk bp->bio_cmd == BIO_WRITE || 378106300Sphk bp->bio_cmd == BIO_DELETE, 379106300Sphk ("Wrong bio_cmd bio=%p cmd=%d", bp, bp->bio_cmd)); 38092108Sphk dev = bp->bio_dev; 38192108Sphk gp = dev->si_drv1; 38292108Sphk cp = dev->si_drv2; 38392108Sphk bp2 = g_clone_bio(bp); 384107834Sphk KASSERT(bp2 != NULL, ("XXX: ENOMEM in a bad place")); 38592108Sphk bp2->bio_offset = (off_t)bp->bio_blkno << DEV_BSHIFT; 386107834Sphk KASSERT(bp2->bio_offset >= 0, 387107834Sphk ("Negative bio_offset (%jd) on bio %p", 388107834Sphk (intmax_t)bp2->bio_offset, bp)); 38992108Sphk bp2->bio_length = (off_t)bp->bio_bcount; 39092108Sphk bp2->bio_done = g_dev_done; 39192108Sphk g_trace(G_T_BIO, 392105540Sphk "g_dev_strategy(%p/%p) offset %jd length %jd data %p cmd %d", 393105540Sphk bp, bp2, (intmax_t)bp->bio_offset, (intmax_t)bp2->bio_length, 394105540Sphk bp2->bio_data, bp2->bio_cmd); 39592108Sphk g_io_request(bp2, cp); 39692108Sphk} 39792108Sphk 39896987Sphk/* 39996987Sphk * g_dev_orphan() 40096987Sphk * 40196987Sphk * Called from below when the provider orphaned us. It is our responsibility 40296987Sphk * to get the access counts back to zero, until we do so the stack below will 40396987Sphk * not unravel. We must clear the kernel-dump settings, if this is the 40496987Sphk * current dumpdev. We call destroy_dev(9) to send our dev_t the way of 40596987Sphk * punched cards and if we have non-zero access counts, we call down with 40696987Sphk * them negated before we detattch and selfdestruct. 40796987Sphk */ 40892108Sphk 40992108Sphkstatic void 41093250Sphkg_dev_orphan(struct g_consumer *cp) 41192108Sphk{ 41292108Sphk struct g_geom *gp; 41392108Sphk dev_t dev; 41492108Sphk 41592108Sphk gp = cp->geom; 41692108Sphk g_trace(G_T_TOPOLOGY, "g_dev_orphan(%p(%s))", cp, gp->name); 41792108Sphk g_topology_assert(); 418110541Sphk if (cp->stat->nop != cp->stat->nend) /* XXX ? */ 41992108Sphk return; 42092108Sphk dev = gp->softc; 42195038Sphk if (dev->si_flags & SI_DUMPDEV) 42295038Sphk set_dumper(NULL); 42396987Sphk /* XXX: we may need Giant for now */ 42492108Sphk destroy_dev(dev); 42592108Sphk if (cp->acr > 0 || cp->acw > 0 || cp->ace > 0) 42692108Sphk g_access_rel(cp, -cp->acr, -cp->acw, -cp->ace); 42798066Sphk g_detach(cp); 42892108Sphk g_destroy_consumer(cp); 42992108Sphk g_destroy_geom(gp); 43092108Sphk} 43192108Sphk 43296987SphkDECLARE_GEOM_CLASS(g_dev_class, g_dev); 433