geom_dev.c revision 94287
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 94287 2002-04-09 15:43:32Z 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> 5192108Sphk 5292108Sphk#define CDEV_MAJOR 4 5392108Sphk 5492108Sphkstatic d_open_t g_dev_open; 5592108Sphkstatic d_close_t g_dev_close; 5692108Sphkstatic d_strategy_t g_dev_strategy; 5792108Sphkstatic d_ioctl_t g_dev_ioctl; 5892108Sphkstatic d_psize_t g_dev_psize; 5992108Sphk 6092108Sphkstatic struct cdevsw g_dev_cdevsw = { 6192108Sphk /* open */ g_dev_open, 6292108Sphk /* close */ g_dev_close, 6392108Sphk /* read */ physread, 6492108Sphk /* write */ physwrite, 6592108Sphk /* ioctl */ g_dev_ioctl, 6692108Sphk /* poll */ nopoll, 6792108Sphk /* mmap */ nommap, 6892108Sphk /* strategy */ g_dev_strategy, 6992108Sphk /* name */ "g_dev", 7092108Sphk /* maj */ CDEV_MAJOR, 7192108Sphk /* dump */ nodump, 7292108Sphk /* psize */ g_dev_psize, 7392108Sphk /* flags */ D_DISK | D_CANFREE | D_TRACKCLOSE, 7492108Sphk}; 7592108Sphk 7692108Sphkstatic g_taste_t g_dev_taste; 7792108Sphkstatic g_orphan_t g_dev_orphan; 7892108Sphk 7993248Sphkstatic struct g_class g_dev_class = { 8093248Sphk "DEV-class", 8192108Sphk g_dev_taste, 8292108Sphk NULL, 8393248Sphk G_CLASS_INITSTUFF 8492108Sphk}; 8592108Sphk 8692108Sphkstatic void 8792108Sphkg_dev_clone(void *arg, char *name, int namelen, dev_t *dev) 8892108Sphk{ 8992108Sphk struct g_geom *gp; 9092108Sphk 9192108Sphk if (*dev != NODEV) 9292108Sphk return; 9392108Sphk 9492108Sphk g_trace(G_T_TOPOLOGY, "g_dev_clone(%s)", name); 9592108Sphk g_rattle(); 9692108Sphk 9792108Sphk /* XXX: can I drop Giant here ??? */ 9892108Sphk /* g_topology_lock(); */ 9993248Sphk LIST_FOREACH(gp, &g_dev_class.geom, geom) { 10092108Sphk if (strcmp(gp->name, name)) 10192108Sphk continue; 10292108Sphk *dev = gp->softc; 10392108Sphk g_trace(G_T_TOPOLOGY, "g_dev_clone(%s) = %p", name, *dev); 10492108Sphk return; 10592108Sphk } 10692108Sphk /* g_topology_unlock(); */ 10792108Sphk return; 10892108Sphk} 10992108Sphk 11092108Sphkstatic void 11192108Sphkg_dev_register_cloner(void *foo __unused) 11292108Sphk{ 11392108Sphk static int once; 11492108Sphk 11592108Sphk if (!once) { 11692108Sphk if (!once) 11792108Sphk EVENTHANDLER_REGISTER(dev_clone, g_dev_clone, 0, 1000); 11892108Sphk once++; 11992108Sphk } 12092108Sphk} 12192108Sphk 12292108SphkSYSINIT(geomdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE,g_dev_register_cloner,NULL); 12392108Sphk 12492108Sphkstatic struct g_geom * 12593250Sphkg_dev_taste(struct g_class *mp, struct g_provider *pp, int insist __unused) 12692108Sphk{ 12792108Sphk struct g_geom *gp; 12892108Sphk struct g_consumer *cp; 12992108Sphk static int unit; 13092108Sphk u_int secsize; 13192108Sphk off_t mediasize; 13292108Sphk int error, j; 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); 14392108Sphk g_attach(cp, pp); 14492108Sphk error = g_access_rel(cp, 1, 0, 0); 14592108Sphk g_topology_unlock(); 14692108Sphk if (!error) { 14792108Sphk j = sizeof secsize; 14893250Sphk error = g_io_getattr("GEOM::sectorsize", cp, &j, &secsize); 14992108Sphk if (error) { 15092108Sphk secsize = 512; 15194285Sphk printf("g_dev_taste: error %d Sectors are %d bytes\n", 15292108Sphk error, secsize); 15392108Sphk } 15492108Sphk j = sizeof mediasize; 15593250Sphk error = g_io_getattr("GEOM::mediasize", cp, &j, &mediasize); 15692108Sphk if (error) { 15792108Sphk mediasize = 0; 15894287Sphk printf("g_dev_taste: error %d Mediasize is %lld bytes\n", 15993326Sphk error, (long long)mediasize); 16092108Sphk } 16192108Sphk g_topology_lock(); 16292108Sphk g_access_rel(cp, -1, 0, 0); 16392108Sphk g_topology_unlock(); 16492108Sphk } else { 16592108Sphk secsize = 512; 16692108Sphk mediasize = 0; 16792108Sphk } 16892108Sphk mtx_lock(&Giant); 16992108Sphk if (mediasize != 0) 17092108Sphk printf("GEOM: \"%s\" %lld bytes in %lld sectors of %u bytes\n", 17193326Sphk pp->name, (long long)mediasize, 17293326Sphk (long long)mediasize / secsize, secsize); 17392108Sphk else 17492108Sphk printf("GEOM: \"%s\" (size unavailable)\n", pp->name); 17592108Sphk dev = make_dev(&g_dev_cdevsw, unit++, 17692108Sphk UID_ROOT, GID_WHEEL, 0600, gp->name); 17792108Sphk gp->softc = dev; 17892108Sphk dev->si_drv1 = gp; 17992108Sphk dev->si_drv2 = cp; 18092108Sphk mtx_unlock(&Giant); 18192108Sphk g_topology_lock(); 18292108Sphk return (gp); 18392108Sphk} 18492108Sphk 18592108Sphkstatic int 18692108Sphkg_dev_open(dev_t dev, int flags, int fmt, struct thread *td) 18792108Sphk{ 18892108Sphk struct g_geom *gp; 18992108Sphk struct g_consumer *cp; 19092108Sphk int error, r, w, e; 19192108Sphk 19292108Sphk gp = dev->si_drv1; 19392108Sphk cp = dev->si_drv2; 19492108Sphk if (gp == NULL || cp == NULL) 19592108Sphk return(ENXIO); 19692108Sphk g_trace(G_T_ACCESS, "g_dev_open(%s, %d, %d, %p)", 19792108Sphk gp->name, flags, fmt, td); 19892479Sphk DROP_GIANT(); 19992108Sphk g_topology_lock(); 20092108Sphk g_silence(); 20192108Sphk r = flags & FREAD ? 1 : 0; 20292108Sphk w = flags & FWRITE ? 1 : 0; 20392108Sphk e = flags & O_EXCL ? 1 : 0; 20492108Sphk error = g_access_rel(cp, r, w, e); 20592108Sphk g_topology_unlock(); 20692479Sphk PICKUP_GIANT(); 20792108Sphk g_rattle(); 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 g_silence(); 22792108Sphk r = flags & FREAD ? -1 : 0; 22892108Sphk w = flags & FWRITE ? -1 : 0; 22992108Sphk e = flags & O_EXCL ? -1 : 0; 23092108Sphk error = g_access_rel(cp, r, w, e); 23192108Sphk g_topology_unlock(); 23292479Sphk PICKUP_GIANT(); 23392108Sphk g_rattle(); 23492108Sphk return (error); 23592108Sphk} 23692108Sphk 23792108Sphkstatic int 23892108Sphkg_dev_ioctl(dev_t dev, u_long cmd, caddr_t data, int fflag, struct thread *td) 23992108Sphk{ 24092108Sphk struct g_geom *gp; 24192108Sphk struct g_consumer *cp; 24292108Sphk int i, error; 24392403Sphk struct g_ioctl *gio; 24492108Sphk 24592108Sphk gp = dev->si_drv1; 24692108Sphk cp = dev->si_drv2; 24792108Sphk 24892108Sphk error = 0; 24992479Sphk DROP_GIANT(); 25092403Sphk 25192698Sphk i = IOCPARM_LEN(cmd); 25292698Sphk switch (cmd) { 25392698Sphk case DIOCGSECTORSIZE: 25493250Sphk error = g_io_getattr("GEOM::sectorsize", cp, &i, data); 25592698Sphk break; 25692698Sphk case DIOCGMEDIASIZE: 25793250Sphk error = g_io_getattr("GEOM::mediasize", cp, &i, data); 25892698Sphk break; 25992698Sphk case DIOCGFWSECTORS: 26093250Sphk error = g_io_getattr("GEOM::fwsectors", cp, &i, data); 26192698Sphk break; 26292698Sphk case DIOCGFWHEADS: 26393250Sphk error = g_io_getattr("GEOM::fwheads", cp, &i, data); 26492698Sphk break; 26594287Sphk case DIOCGFRONTSTUFF: 26694287Sphk error = g_io_getattr("GEOM::frontstuff", cp, &i, data); 26794287Sphk break; 26892698Sphk default: 26992698Sphk gio = g_malloc(sizeof *gio, M_WAITOK); 27092698Sphk gio->cmd = cmd; 27192698Sphk gio->data = data; 27292698Sphk gio->fflag = fflag; 27392698Sphk gio->td = td; 27492698Sphk i = sizeof *gio; 27592698Sphk if (cmd & IOC_IN) 27693250Sphk error = g_io_setattr("GEOM::ioctl", cp, i, gio); 27792698Sphk else 27893250Sphk error = g_io_getattr("GEOM::ioctl", cp, &i, gio); 27992698Sphk g_free(gio); 28092698Sphk break; 28192698Sphk } 28292403Sphk 28392408Sphk if (error != 0 && cmd == DIOCGDVIRGIN) { 28492408Sphk g_topology_lock(); 28593248Sphk gp = g_create_geomf("BSD-class", cp->provider, NULL); 28692408Sphk g_topology_unlock(); 28792108Sphk } 28892479Sphk PICKUP_GIANT(); 28992403Sphk g_rattle(); 29092403Sphk if (error == ENOIOCTL) { 29192403Sphk i = IOCGROUP(cmd); 29292108Sphk printf("IOCTL(0x%lx) \"%s\"", cmd, gp->name); 29392108Sphk if (i > ' ' && i <= '~') 29492108Sphk printf(" '%c'", (int)IOCGROUP(cmd)); 29592108Sphk else 29692108Sphk printf(" 0x%lx", IOCGROUP(cmd)); 29792108Sphk printf("/%ld ", cmd & 0xff); 29892108Sphk if (cmd & IOC_IN) 29992108Sphk printf("I"); 30092108Sphk if (cmd & IOC_OUT) 30192108Sphk printf("O"); 30292403Sphk printf("(%ld) = ENOIOCTL\n", IOCPARM_LEN(cmd)); 30392403Sphk error = ENOTTY; 30492108Sphk } 30592108Sphk return (error); 30692108Sphk} 30792108Sphk 30892108Sphkstatic int 30992108Sphkg_dev_psize(dev_t dev) 31092108Sphk{ 31192108Sphk struct g_consumer *cp; 31292108Sphk int i, error; 31392108Sphk off_t mediasize; 31492108Sphk 31592108Sphk cp = dev->si_drv2; 31692108Sphk 31792108Sphk i = sizeof mediasize; 31893250Sphk error = g_io_getattr("GEOM::mediasize", cp, &i, &mediasize); 31992108Sphk if (error) 32092108Sphk return (-1); 32192108Sphk return (mediasize >> DEV_BSHIFT); 32292108Sphk} 32392108Sphk 32492108Sphkstatic void 32592108Sphkg_dev_done(struct bio *bp2) 32692108Sphk{ 32792108Sphk struct bio *bp; 32892108Sphk 32992108Sphk bp = bp2->bio_linkage; 33092108Sphk bp->bio_error = bp2->bio_error; 33192108Sphk if (bp->bio_error != 0) { 33292108Sphk g_trace(G_T_BIO, "g_dev_done(%p) had error %d", 33392108Sphk bp2, bp->bio_error); 33492108Sphk bp->bio_flags |= BIO_ERROR; 33592108Sphk } else { 33692108Sphk g_trace(G_T_BIO, "g_dev_done(%p/%p) resid %ld completed %lld", 33792108Sphk bp2, bp, bp->bio_resid, bp2->bio_completed); 33892108Sphk } 33992108Sphk bp->bio_resid = bp->bio_bcount - bp2->bio_completed; 34092108Sphk g_destroy_bio(bp2); 34192108Sphk mtx_lock(&Giant); 34292108Sphk biodone(bp); 34392108Sphk mtx_unlock(&Giant); 34492108Sphk} 34592108Sphk 34692108Sphkstatic void 34792108Sphkg_dev_strategy(struct bio *bp) 34892108Sphk{ 34992108Sphk struct g_geom *gp; 35092108Sphk struct g_consumer *cp; 35192108Sphk struct bio *bp2; 35292108Sphk dev_t dev; 35392108Sphk 35492108Sphk dev = bp->bio_dev; 35592108Sphk gp = dev->si_drv1; 35692108Sphk cp = dev->si_drv2; 35792108Sphk bp2 = g_clone_bio(bp); 35892108Sphk bp2->bio_offset = (off_t)bp->bio_blkno << DEV_BSHIFT; 35992108Sphk bp2->bio_length = (off_t)bp->bio_bcount; 36092108Sphk bp2->bio_done = g_dev_done; 36192108Sphk g_trace(G_T_BIO, 36292108Sphk "g_dev_strategy(%p/%p) offset %lld length %lld data %p cmd %d", 36392108Sphk bp, bp2, bp->bio_offset, bp2->bio_length, bp2->bio_data, 36492108Sphk bp2->bio_cmd); 36592108Sphk g_io_request(bp2, cp); 36692108Sphk} 36792108Sphk 36892108Sphk 36992108Sphkstatic void 37093250Sphkg_dev_orphan(struct g_consumer *cp) 37192108Sphk{ 37292108Sphk struct g_geom *gp; 37392108Sphk dev_t dev; 37492108Sphk 37592108Sphk gp = cp->geom; 37692108Sphk g_trace(G_T_TOPOLOGY, "g_dev_orphan(%p(%s))", cp, gp->name); 37792108Sphk g_topology_assert(); 37892108Sphk if (cp->biocount > 0) 37992108Sphk return; 38092108Sphk dev = gp->softc; 38192108Sphk destroy_dev(dev); 38292108Sphk if (cp->acr > 0 || cp->acw > 0 || cp->ace > 0) 38392108Sphk g_access_rel(cp, -cp->acr, -cp->acw, -cp->ace); 38492108Sphk g_dettach(cp); 38592108Sphk g_destroy_consumer(cp); 38692108Sphk g_destroy_geom(gp); 38792108Sphk} 38892108Sphk 38993248SphkDECLARE_GEOM_CLASS(g_dev_class, g_dev) 39092108Sphk 391