geom_dev.c revision 133318
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 36116196Sobrien#include <sys/cdefs.h> 37116196Sobrien__FBSDID("$FreeBSD: head/sys/geom/geom_dev.c 133318 2004-08-08 07:57:53Z phk $"); 38116196Sobrien 3992108Sphk#include <sys/param.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> 47130712Sphk#include <sys/proc.h> 4892108Sphk#include <sys/errno.h> 4992108Sphk#include <sys/time.h> 5092108Sphk#include <sys/disk.h> 5192108Sphk#include <sys/fcntl.h> 52114216Skan#include <sys/limits.h> 5392108Sphk#include <geom/geom.h> 5495323Sphk#include <geom/geom_int.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 = { 62126080Sphk .d_version = D_VERSION, 63111815Sphk .d_open = g_dev_open, 64111815Sphk .d_close = g_dev_close, 65111815Sphk .d_read = physread, 66111815Sphk .d_write = physwrite, 67111815Sphk .d_ioctl = g_dev_ioctl, 68111815Sphk .d_strategy = g_dev_strategy, 69111815Sphk .d_name = "g_dev", 70111815Sphk .d_maj = GEOM_MAJOR, 71126080Sphk .d_flags = D_DISK | D_TRACKCLOSE, 7292108Sphk}; 7392108Sphk 7492108Sphkstatic g_taste_t g_dev_taste; 7592108Sphkstatic g_orphan_t g_dev_orphan; 7692108Sphk 7793248Sphkstatic struct g_class g_dev_class = { 78112552Sphk .name = "DEV", 79133318Sphk .version = G_VERSION, 80112552Sphk .taste = g_dev_taste, 81133314Sphk .orphan = g_dev_orphan, 8292108Sphk}; 8392108Sphk 84115960Sphkvoid 85105947Sphkg_dev_print(void) 86105947Sphk{ 87105947Sphk struct g_geom *gp; 88115960Sphk char const *p = ""; 89105947Sphk 90115960Sphk LIST_FOREACH(gp, &g_dev_class.geom, geom) { 91115960Sphk printf("%s%s", p, gp->name); 92115960Sphk p = " "; 93115960Sphk } 94105947Sphk printf("\n"); 95105947Sphk} 96105947Sphk 97119593Sphkstruct g_provider * 98130585Sphkg_dev_getprovider(struct cdev *dev) 99119593Sphk{ 100119593Sphk struct g_consumer *cp; 101119593Sphk 102119593Sphk if (dev == NULL) 103119593Sphk return (NULL); 104119593Sphk if (devsw(dev) != &g_dev_cdevsw) 105119593Sphk return (NULL); 106119593Sphk cp = dev->si_drv2; 107119593Sphk return (cp->provider); 108119593Sphk} 109119593Sphk 110119593Sphk 11192108Sphkstatic struct g_geom * 11293250Sphkg_dev_taste(struct g_class *mp, struct g_provider *pp, int insist __unused) 11392108Sphk{ 11492108Sphk struct g_geom *gp; 11592108Sphk struct g_consumer *cp; 116110540Sphk static int unit = GEOM_MINOR_PROVIDERS; 11796987Sphk int error; 118130585Sphk struct cdev *dev; 11992108Sphk 12092108Sphk g_trace(G_T_TOPOLOGY, "dev_taste(%s,%s)", mp->name, pp->name); 12192108Sphk g_topology_assert(); 12292108Sphk LIST_FOREACH(cp, &pp->consumers, consumers) 12393248Sphk if (cp->geom->class == mp) 12492108Sphk return (NULL); 12592108Sphk gp = g_new_geomf(mp, pp->name); 12692108Sphk cp = g_new_consumer(gp); 12796987Sphk error = g_attach(cp, pp); 12896987Sphk KASSERT(error == 0, 12996987Sphk ("g_dev_taste(%s) failed to g_attach, err=%d", pp->name, error)); 13096987Sphk /* 13196987Sphk * XXX: I'm not 100% sure we can call make_dev(9) without Giant 13296987Sphk * yet. Once we can, we don't need to drop topology here either. 13396987Sphk */ 13492108Sphk g_topology_unlock(); 13592108Sphk mtx_lock(&Giant); 13696987Sphk dev = make_dev(&g_dev_cdevsw, unit2minor(unit++), 137104316Sphk UID_ROOT, GID_OPERATOR, 0640, gp->name); 138110700Sphk if (pp->flags & G_PF_CANDELETE) 139110700Sphk dev->si_flags |= SI_CANDELETE; 14096987Sphk mtx_unlock(&Giant); 14196987Sphk g_topology_lock(); 142110728Sphk dev->si_iosize_max = MAXPHYS; 143110710Sphk dev->si_stripesize = pp->stripesize; 144110710Sphk dev->si_stripeoffset = pp->stripeoffset; 14592108Sphk gp->softc = dev; 14692108Sphk dev->si_drv1 = gp; 14792108Sphk dev->si_drv2 = cp; 14892108Sphk return (gp); 14992108Sphk} 15092108Sphk 15192108Sphkstatic int 152130585Sphkg_dev_open(struct cdev *dev, int flags, int fmt, struct thread *td) 15392108Sphk{ 15492108Sphk struct g_geom *gp; 15592108Sphk struct g_consumer *cp; 15692108Sphk int error, r, w, e; 15792108Sphk 15892108Sphk gp = dev->si_drv1; 15992108Sphk cp = dev->si_drv2; 160112978Sphk if (gp == NULL || cp == NULL || gp->softc != dev) 161112978Sphk return(ENXIO); /* g_dev_taste() not done yet */ 162112978Sphk 16392108Sphk g_trace(G_T_ACCESS, "g_dev_open(%s, %d, %d, %p)", 16492108Sphk gp->name, flags, fmt, td); 165130712Sphk 16692108Sphk r = flags & FREAD ? 1 : 0; 16792108Sphk w = flags & FWRITE ? 1 : 0; 168103004Sphk#ifdef notyet 16992108Sphk e = flags & O_EXCL ? 1 : 0; 170103004Sphk#else 171103004Sphk e = 0; 172103004Sphk#endif 173130712Sphk if (w) { 174130712Sphk /* 175130712Sphk * When running in very secure mode, do not allow 176130712Sphk * opens for writing of any disks. 177130712Sphk */ 178130712Sphk error = securelevel_ge(td->td_ucred, 2); 179130712Sphk if (error) 180130712Sphk return (error); 181130712Sphk } 182112978Sphk g_topology_lock(); 183112978Sphk if (dev->si_devsw == NULL) 184112978Sphk error = ENXIO; /* We were orphaned */ 185112978Sphk else 186125755Sphk error = g_access(cp, r, w, e); 18792108Sphk g_topology_unlock(); 18898066Sphk g_waitidle(); 189112978Sphk if (!error) 190112978Sphk dev->si_bsize_phys = cp->provider->sectorsize; 19192108Sphk return(error); 19292108Sphk} 19392108Sphk 19492108Sphkstatic int 195130585Sphkg_dev_close(struct cdev *dev, int flags, int fmt, struct thread *td) 19692108Sphk{ 19792108Sphk struct g_geom *gp; 19892108Sphk struct g_consumer *cp; 199114864Sphk int error, r, w, e, i; 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); 20792108Sphk r = flags & FREAD ? -1 : 0; 20892108Sphk w = flags & FWRITE ? -1 : 0; 209103004Sphk#ifdef notyet 21092108Sphk e = flags & O_EXCL ? -1 : 0; 211103004Sphk#else 212103004Sphk e = 0; 213103004Sphk#endif 214112978Sphk g_topology_lock(); 215112978Sphk if (dev->si_devsw == NULL) 216112978Sphk error = ENXIO; /* We were orphaned */ 217112978Sphk else 218125755Sphk error = g_access(cp, r, w, e); 219114864Sphk for (i = 0; i < 10 * hz;) { 220114864Sphk if (cp->acr != 0 || cp->acw != 0) 221114864Sphk break; 222114864Sphk if (cp->nstart == cp->nend) 223114864Sphk break; 224114864Sphk tsleep(&i, PRIBIO, "gdevwclose", hz / 10); 225114864Sphk i += hz / 10; 226114864Sphk } 227114864Sphk if (cp->acr == 0 && cp->acw == 0 && cp->nstart != cp->nend) { 228124880Sphk printf("WARNING: Final close of geom_dev(%s) %s %s\n", 229114864Sphk gp->name, 230114864Sphk "still has outstanding I/O after 10 seconds.", 231114864Sphk "Completing close anyway, panic may happen later."); 232114864Sphk } 23392108Sphk g_topology_unlock(); 23498066Sphk g_waitidle(); 23592108Sphk return (error); 23692108Sphk} 23792108Sphk 238112978Sphk/* 239112978Sphk * XXX: Until we have unmessed the ioctl situation, there is a race against 240112978Sphk * XXX: a concurrent orphanization. We cannot close it by holding topology 241112978Sphk * XXX: since that would prevent us from doing our job, and stalling events 242112978Sphk * XXX: will break (actually: stall) the BSD disklabel hacks. 243112978Sphk */ 24492108Sphkstatic int 245130585Sphkg_dev_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag, struct thread *td) 24692108Sphk{ 247115515Sphk struct g_geom *gp; 24892108Sphk struct g_consumer *cp; 24995038Sphk struct g_kerneldump kd; 25092108Sphk int i, error; 25195038Sphk u_int u; 25292108Sphk 25392108Sphk gp = dev->si_drv1; 25492108Sphk cp = dev->si_drv2; 25592108Sphk 25692108Sphk error = 0; 257112978Sphk KASSERT(cp->acr || cp->acw, 258112978Sphk ("Consumer with zero access count in g_dev_ioctl")); 25992403Sphk 26092698Sphk i = IOCPARM_LEN(cmd); 26192698Sphk switch (cmd) { 26292698Sphk case DIOCGSECTORSIZE: 263105551Sphk *(u_int *)data = cp->provider->sectorsize; 264105551Sphk if (*(u_int *)data == 0) 265105180Snjl error = ENOENT; 26692698Sphk break; 26792698Sphk case DIOCGMEDIASIZE: 268105551Sphk *(off_t *)data = cp->provider->mediasize; 269105551Sphk if (*(off_t *)data == 0) 270105180Snjl error = ENOENT; 27192698Sphk break; 27292698Sphk case DIOCGFWSECTORS: 27393250Sphk error = g_io_getattr("GEOM::fwsectors", cp, &i, data); 274105180Snjl if (error == 0 && *(u_int *)data == 0) 275105180Snjl error = ENOENT; 27692698Sphk break; 27792698Sphk case DIOCGFWHEADS: 27893250Sphk error = g_io_getattr("GEOM::fwheads", cp, &i, data); 279105180Snjl if (error == 0 && *(u_int *)data == 0) 280105180Snjl error = ENOENT; 28192698Sphk break; 28294287Sphk case DIOCGFRONTSTUFF: 28394287Sphk error = g_io_getattr("GEOM::frontstuff", cp, &i, data); 28494287Sphk break; 28595038Sphk case DIOCSKERNELDUMP: 28695038Sphk u = *((u_int *)data); 28795038Sphk if (!u) { 28895038Sphk set_dumper(NULL); 28995038Sphk error = 0; 29095038Sphk break; 29195038Sphk } 29295038Sphk kd.offset = 0; 29395038Sphk kd.length = OFF_MAX; 29495038Sphk i = sizeof kd; 29595038Sphk error = g_io_getattr("GEOM::kerneldump", cp, &i, &kd); 29695038Sphk if (!error) 29795038Sphk dev->si_flags |= SI_DUMPDEV; 29895038Sphk break; 299104602Sphk 30092698Sphk default: 301119660Sphk if (cp->provider->geom->ioctl != NULL) { 302119660Sphk error = cp->provider->geom->ioctl(cp->provider, cmd, data, td); 303119749Sphk } else { 304119749Sphk error = ENOIOCTL; 305119660Sphk } 30692698Sphk } 30792403Sphk 30898066Sphk g_waitidle(); 30992108Sphk return (error); 31092108Sphk} 31192108Sphk 31292108Sphkstatic void 31392108Sphkg_dev_done(struct bio *bp2) 31492108Sphk{ 31592108Sphk struct bio *bp; 31692108Sphk 317110517Sphk bp = bp2->bio_parent; 31892108Sphk bp->bio_error = bp2->bio_error; 31992108Sphk if (bp->bio_error != 0) { 32092108Sphk g_trace(G_T_BIO, "g_dev_done(%p) had error %d", 32192108Sphk bp2, bp->bio_error); 32292108Sphk bp->bio_flags |= BIO_ERROR; 32392108Sphk } else { 324105540Sphk g_trace(G_T_BIO, "g_dev_done(%p/%p) resid %ld completed %jd", 325105540Sphk bp2, bp, bp->bio_resid, (intmax_t)bp2->bio_completed); 32692108Sphk } 32792108Sphk bp->bio_resid = bp->bio_bcount - bp2->bio_completed; 32892108Sphk g_destroy_bio(bp2); 32992108Sphk biodone(bp); 33092108Sphk} 33192108Sphk 33292108Sphkstatic void 33392108Sphkg_dev_strategy(struct bio *bp) 33492108Sphk{ 33592108Sphk struct g_consumer *cp; 33692108Sphk struct bio *bp2; 337130585Sphk struct cdev *dev; 33892108Sphk 339106300Sphk KASSERT(bp->bio_cmd == BIO_READ || 340106300Sphk bp->bio_cmd == BIO_WRITE || 341106300Sphk bp->bio_cmd == BIO_DELETE, 342106300Sphk ("Wrong bio_cmd bio=%p cmd=%d", bp, bp->bio_cmd)); 34392108Sphk dev = bp->bio_dev; 34492108Sphk cp = dev->si_drv2; 345112978Sphk KASSERT(cp->acr || cp->acw, 346112978Sphk ("Consumer with zero access count in g_dev_strategy")); 347112978Sphk 348118869Sphk for (;;) { 349118869Sphk /* 350118869Sphk * XXX: This is not an ideal solution, but I belive it to 351118869Sphk * XXX: deadlock safe, all things considered. 352118869Sphk */ 353118869Sphk bp2 = g_clone_bio(bp); 354118869Sphk if (bp2 != NULL) 355118869Sphk break; 356118869Sphk tsleep(&bp, PRIBIO, "gdstrat", hz / 10); 357118869Sphk } 358107834Sphk KASSERT(bp2 != NULL, ("XXX: ENOMEM in a bad place")); 35992108Sphk bp2->bio_length = (off_t)bp->bio_bcount; 36092108Sphk bp2->bio_done = g_dev_done; 36192108Sphk g_trace(G_T_BIO, 362105540Sphk "g_dev_strategy(%p/%p) offset %jd length %jd data %p cmd %d", 363105540Sphk bp, bp2, (intmax_t)bp->bio_offset, (intmax_t)bp2->bio_length, 364105540Sphk bp2->bio_data, bp2->bio_cmd); 36592108Sphk g_io_request(bp2, cp); 366112978Sphk KASSERT(cp->acr || cp->acw, 367112978Sphk ("g_dev_strategy raced with g_dev_close and lost")); 368112978Sphk 36992108Sphk} 37092108Sphk 37196987Sphk/* 37296987Sphk * g_dev_orphan() 37396987Sphk * 374112024Sphk * Called from below when the provider orphaned us. 375112024Sphk * - Clear any dump settings. 376130585Sphk * - Destroy the struct cdev *to prevent any more request from coming in. The 377112024Sphk * provider is already marked with an error, so anything which comes in 378112024Sphk * in the interrim will be returned immediately. 379112024Sphk * - Wait for any outstanding I/O to finish. 380112024Sphk * - Set our access counts to zero, whatever they were. 381112024Sphk * - Detach and self-destruct. 38296987Sphk */ 38392108Sphk 38492108Sphkstatic void 38593250Sphkg_dev_orphan(struct g_consumer *cp) 38692108Sphk{ 38792108Sphk struct g_geom *gp; 388130585Sphk struct cdev *dev; 38992108Sphk 390112024Sphk g_topology_assert(); 39192108Sphk gp = cp->geom; 392112024Sphk dev = gp->softc; 39392108Sphk g_trace(G_T_TOPOLOGY, "g_dev_orphan(%p(%s))", cp, gp->name); 394112024Sphk 395112024Sphk /* Reset any dump-area set on this device */ 39695038Sphk if (dev->si_flags & SI_DUMPDEV) 39795038Sphk set_dumper(NULL); 398112024Sphk 399130585Sphk /* Destroy the struct cdev *so we get no more requests */ 40092108Sphk destroy_dev(dev); 401112024Sphk 402112024Sphk /* Wait for the cows to come home */ 403112024Sphk while (cp->nstart != cp->nend) 404112978Sphk msleep(&dev, NULL, PRIBIO, "gdevorphan", hz / 10); 405112024Sphk 40692108Sphk if (cp->acr > 0 || cp->acw > 0 || cp->ace > 0) 407125755Sphk g_access(cp, -cp->acr, -cp->acw, -cp->ace); 408112024Sphk 40998066Sphk g_detach(cp); 41092108Sphk g_destroy_consumer(cp); 41192108Sphk g_destroy_geom(gp); 41292108Sphk} 41392108Sphk 41496987SphkDECLARE_GEOM_CLASS(g_dev_class, g_dev); 415