geom_dev.c revision 92108
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 92108 2002-03-11 21:42:35Z phk $ 3692108Sphk */ 3792108Sphk 3892108Sphk 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> 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> 5292108Sphk 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 = { 6392108Sphk /* open */ g_dev_open, 6492108Sphk /* close */ g_dev_close, 6592108Sphk /* read */ physread, 6692108Sphk /* write */ physwrite, 6792108Sphk /* ioctl */ g_dev_ioctl, 6892108Sphk /* poll */ nopoll, 6992108Sphk /* mmap */ nommap, 7092108Sphk /* strategy */ g_dev_strategy, 7192108Sphk /* name */ "g_dev", 7292108Sphk /* maj */ CDEV_MAJOR, 7392108Sphk /* dump */ nodump, 7492108Sphk /* psize */ g_dev_psize, 7592108Sphk /* flags */ D_DISK | D_CANFREE | D_TRACKCLOSE, 7692108Sphk}; 7792108Sphk 7892108Sphkstatic g_taste_t g_dev_taste; 7992108Sphkstatic g_orphan_t g_dev_orphan; 8092108Sphk 8192108Sphkstatic struct g_method g_dev_method = { 8292108Sphk "DEV-method", 8392108Sphk g_dev_taste, 8492108Sphk NULL, 8592108Sphk g_dev_orphan, 8692108Sphk NULL, 8792108Sphk G_METHOD_INITSTUFF 8892108Sphk}; 8992108Sphk 9092108Sphkstatic void 9192108Sphkg_dev_clone(void *arg, char *name, int namelen, dev_t *dev) 9292108Sphk{ 9392108Sphk struct g_geom *gp; 9492108Sphk 9592108Sphk if (*dev != NODEV) 9692108Sphk return; 9792108Sphk 9892108Sphk g_trace(G_T_TOPOLOGY, "g_dev_clone(%s)", name); 9992108Sphk g_rattle(); 10092108Sphk 10192108Sphk /* XXX: can I drop Giant here ??? */ 10292108Sphk /* g_topology_lock(); */ 10392108Sphk LIST_FOREACH(gp, &g_dev_method.geom, geom) { 10492108Sphk if (strcmp(gp->name, name)) 10592108Sphk continue; 10692108Sphk *dev = gp->softc; 10792108Sphk g_trace(G_T_TOPOLOGY, "g_dev_clone(%s) = %p", name, *dev); 10892108Sphk return; 10992108Sphk } 11092108Sphk /* g_topology_unlock(); */ 11192108Sphk return; 11292108Sphk} 11392108Sphk 11492108Sphkstatic void 11592108Sphkg_dev_register_cloner(void *foo __unused) 11692108Sphk{ 11792108Sphk static int once; 11892108Sphk 11992108Sphk if (!once) { 12092108Sphk if (!once) 12192108Sphk EVENTHANDLER_REGISTER(dev_clone, g_dev_clone, 0, 1000); 12292108Sphk once++; 12392108Sphk } 12492108Sphk} 12592108Sphk 12692108SphkSYSINIT(geomdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE,g_dev_register_cloner,NULL); 12792108Sphk 12892108Sphkstatic struct g_geom * 12992108Sphkg_dev_taste(struct g_method *mp, struct g_provider *pp, struct thread *tp __unused, int insist __unused) 13092108Sphk{ 13192108Sphk struct g_geom *gp; 13292108Sphk struct g_consumer *cp; 13392108Sphk static int unit; 13492108Sphk#if 1 13592108Sphk u_int secsize; 13692108Sphk off_t mediasize; 13792108Sphk int error, j; 13892108Sphk#endif 13992108Sphk dev_t dev; 14092108Sphk 14192108Sphk g_trace(G_T_TOPOLOGY, "dev_taste(%s,%s)", mp->name, pp->name); 14292108Sphk g_topology_assert(); 14392108Sphk LIST_FOREACH(cp, &pp->consumers, consumers) 14492108Sphk if (cp->geom->method == mp) 14592108Sphk return (NULL); 14692108Sphk gp = g_new_geomf(mp, pp->name); 14792108Sphk cp = g_new_consumer(gp); 14892108Sphk g_attach(cp, pp); 14992108Sphk#if 1 15092108Sphk error = g_access_rel(cp, 1, 0, 0); 15192108Sphk g_topology_unlock(); 15292108Sphk if (!error) { 15392108Sphk j = sizeof secsize; 15492108Sphk error = g_io_getattr("GEOM::sectorsize", cp, &j, &secsize, tp); 15592108Sphk if (error) { 15692108Sphk secsize = 512; 15792108Sphk printf("g_bsd_taste: error %d Sectors are %d bytes\n", 15892108Sphk error, secsize); 15992108Sphk } 16092108Sphk j = sizeof mediasize; 16192108Sphk error = g_io_getattr("GEOM::mediasize", cp, &j, &mediasize, tp); 16292108Sphk if (error) { 16392108Sphk mediasize = 0; 16492108Sphk printf("g_error %d Mediasize is %lld bytes\n", 16592108Sphk error, mediasize); 16692108Sphk } 16792108Sphk g_topology_lock(); 16892108Sphk g_access_rel(cp, -1, 0, 0); 16992108Sphk g_topology_unlock(); 17092108Sphk } else { 17192108Sphk secsize = 512; 17292108Sphk mediasize = 0; 17392108Sphk } 17492108Sphk#else 17592108Sphk g_topology_unlock(); 17692108Sphk#endif 17792108Sphk mtx_lock(&Giant); 17892108Sphk#if 1 17992108Sphk if (mediasize != 0) 18092108Sphk printf("GEOM: \"%s\" %lld bytes in %lld sectors of %u bytes\n", 18192108Sphk pp->name, mediasize, mediasize / secsize, secsize); 18292108Sphk else 18392108Sphk printf("GEOM: \"%s\" (size unavailable)\n", pp->name); 18492108Sphk#endif 18592108Sphk dev = make_dev(&g_dev_cdevsw, unit++, 18692108Sphk UID_ROOT, GID_WHEEL, 0600, gp->name); 18792108Sphk gp->softc = dev; 18892108Sphk dev->si_drv1 = gp; 18992108Sphk dev->si_drv2 = cp; 19092108Sphk mtx_unlock(&Giant); 19192108Sphk g_topology_lock(); 19292108Sphk return (gp); 19392108Sphk} 19492108Sphk 19592108Sphkstatic int 19692108Sphkg_dev_open(dev_t dev, int flags, int fmt, struct thread *td) 19792108Sphk{ 19892108Sphk struct g_geom *gp; 19992108Sphk struct g_consumer *cp; 20092108Sphk int error, r, w, e; 20192108Sphk 20292108Sphk gp = dev->si_drv1; 20392108Sphk cp = dev->si_drv2; 20492108Sphk if (gp == NULL || cp == NULL) 20592108Sphk return(ENXIO); 20692108Sphk g_trace(G_T_ACCESS, "g_dev_open(%s, %d, %d, %p)", 20792108Sphk gp->name, flags, fmt, td); 20892108Sphk mtx_unlock(&Giant); 20992108Sphk g_topology_lock(); 21092108Sphk g_silence(); 21192108Sphk r = flags & FREAD ? 1 : 0; 21292108Sphk w = flags & FWRITE ? 1 : 0; 21392108Sphk e = flags & O_EXCL ? 1 : 0; 21492108Sphk error = g_access_rel(cp, r, w, e); 21592108Sphk g_topology_unlock(); 21692108Sphk mtx_lock(&Giant); 21792108Sphk g_rattle(); 21892108Sphk return(error); 21992108Sphk} 22092108Sphk 22192108Sphkstatic int 22292108Sphkg_dev_close(dev_t dev, int flags, int fmt, struct thread *td) 22392108Sphk{ 22492108Sphk struct g_geom *gp; 22592108Sphk struct g_consumer *cp; 22692108Sphk int error, r, w, e; 22792108Sphk 22892108Sphk gp = dev->si_drv1; 22992108Sphk cp = dev->si_drv2; 23092108Sphk if (gp == NULL || cp == NULL) 23192108Sphk return(ENXIO); 23292108Sphk g_trace(G_T_ACCESS, "g_dev_close(%s, %d, %d, %p)", 23392108Sphk gp->name, flags, fmt, td); 23492108Sphk mtx_unlock(&Giant); 23592108Sphk g_topology_lock(); 23692108Sphk g_silence(); 23792108Sphk r = flags & FREAD ? -1 : 0; 23892108Sphk w = flags & FWRITE ? -1 : 0; 23992108Sphk e = flags & O_EXCL ? -1 : 0; 24092108Sphk error = g_access_rel(cp, r, w, e); 24192108Sphk g_topology_unlock(); 24292108Sphk mtx_lock(&Giant); 24392108Sphk g_rattle(); 24492108Sphk return (error); 24592108Sphk} 24692108Sphk 24792108Sphkstatic int 24892108Sphkg_dev_ioctl(dev_t dev, u_long cmd, caddr_t data, int fflag, struct thread *td) 24992108Sphk{ 25092108Sphk struct g_geom *gp; 25192108Sphk struct g_consumer *cp; 25292108Sphk char *nm; 25392108Sphk int i, error; 25492108Sphk 25592108Sphk gp = dev->si_drv1; 25692108Sphk cp = dev->si_drv2; 25792108Sphk 25892108Sphk error = 0; 25992108Sphk mtx_unlock(&Giant); 26092108Sphk switch (cmd) { 26192108Sphk case DIOCGDINFO: nm = "IOCTL::DIOCGDINFO"; break; 26292108Sphk case DIOCGDVIRGIN: nm = "IOCTL::DIOCGDVIRGIN"; break; 26392108Sphk case DIOCGPART: nm = "IOCTL::DIOCGPART"; break; 26492108Sphk default: nm = "?"; break; 26592108Sphk } 26692108Sphk i = IOCGROUP(cmd); 26792108Sphk if (*nm == '?') { 26892108Sphk printf("IOCTL(0x%lx) \"%s\"", cmd, gp->name); 26992108Sphk if (i > ' ' && i <= '~') 27092108Sphk printf(" '%c'", (int)IOCGROUP(cmd)); 27192108Sphk else 27292108Sphk printf(" 0x%lx", IOCGROUP(cmd)); 27392108Sphk printf("/%ld ", cmd & 0xff); 27492108Sphk if (cmd & IOC_IN) 27592108Sphk printf("I"); 27692108Sphk if (cmd & IOC_OUT) 27792108Sphk printf("O"); 27892108Sphk printf("(%ld)", IOCPARM_LEN(cmd)); 27992108Sphk printf(" \"%s\"\n", nm); 28092108Sphk error = ENOIOCTL; 28192108Sphk } 28292108Sphk if (error == 0) { 28392108Sphk i = IOCPARM_LEN(cmd); 28492108Sphk error = g_io_getattr(nm, cp, &i, data, td); 28592108Sphk if (error != 0 && cmd == DIOCGDVIRGIN) { 28692108Sphk g_topology_lock(); 28792108Sphk gp = g_create_geomf("BSD-method", cp->provider, NULL); 28892108Sphk g_topology_unlock(); 28992108Sphk } 29092108Sphk } 29192108Sphk mtx_lock(&Giant); 29292108Sphk g_rattle(); 29392108Sphk if (error == ENOIOCTL) 29492108Sphk error = ENOTTY; 29592108Sphk return (error); 29692108Sphk} 29792108Sphk 29892108Sphkstatic int 29992108Sphkg_dev_psize(dev_t dev) 30092108Sphk{ 30192108Sphk struct g_consumer *cp; 30292108Sphk int i, error; 30392108Sphk off_t mediasize; 30492108Sphk 30592108Sphk cp = dev->si_drv2; 30692108Sphk 30792108Sphk i = sizeof mediasize; 30892108Sphk error = g_io_getattr("GEOM::mediasize", cp, &i, &mediasize, NULL); 30992108Sphk if (error) 31092108Sphk return (-1); 31192108Sphk return (mediasize >> DEV_BSHIFT); 31292108Sphk} 31392108Sphk 31492108Sphkstatic void 31592108Sphkg_dev_done(struct bio *bp2) 31692108Sphk{ 31792108Sphk struct bio *bp; 31892108Sphk 31992108Sphk bp = bp2->bio_linkage; 32092108Sphk bp->bio_error = bp2->bio_error; 32192108Sphk if (bp->bio_error != 0) { 32292108Sphk g_trace(G_T_BIO, "g_dev_done(%p) had error %d", 32392108Sphk bp2, bp->bio_error); 32492108Sphk bp->bio_flags |= BIO_ERROR; 32592108Sphk } else { 32692108Sphk g_trace(G_T_BIO, "g_dev_done(%p/%p) resid %ld completed %lld", 32792108Sphk bp2, bp, bp->bio_resid, bp2->bio_completed); 32892108Sphk } 32992108Sphk bp->bio_resid = bp->bio_bcount - bp2->bio_completed; 33092108Sphk g_destroy_bio(bp2); 33192108Sphk mtx_lock(&Giant); 33292108Sphk biodone(bp); 33392108Sphk mtx_unlock(&Giant); 33492108Sphk} 33592108Sphk 33692108Sphkstatic void 33792108Sphkg_dev_strategy(struct bio *bp) 33892108Sphk{ 33992108Sphk struct g_geom *gp; 34092108Sphk struct g_consumer *cp; 34192108Sphk struct bio *bp2; 34292108Sphk dev_t dev; 34392108Sphk 34492108Sphk mtx_unlock(&Giant); 34592108Sphk dev = bp->bio_dev; 34692108Sphk gp = dev->si_drv1; 34792108Sphk cp = dev->si_drv2; 34892108Sphk bp2 = g_clone_bio(bp); 34992108Sphk bp2->bio_offset = (off_t)bp->bio_blkno << DEV_BSHIFT; 35092108Sphk bp2->bio_length = (off_t)bp->bio_bcount; 35192108Sphk bp2->bio_done = g_dev_done; 35292108Sphk g_trace(G_T_BIO, 35392108Sphk "g_dev_strategy(%p/%p) offset %lld length %lld data %p cmd %d", 35492108Sphk bp, bp2, bp->bio_offset, bp2->bio_length, bp2->bio_data, 35592108Sphk bp2->bio_cmd); 35692108Sphk g_io_request(bp2, cp); 35792108Sphk mtx_lock(&Giant); 35892108Sphk} 35992108Sphk 36092108Sphk 36192108Sphkstatic void 36292108Sphkg_dev_orphan(struct g_consumer *cp, struct thread *tp) 36392108Sphk{ 36492108Sphk struct g_geom *gp; 36592108Sphk dev_t dev; 36692108Sphk 36792108Sphk gp = cp->geom; 36892108Sphk g_trace(G_T_TOPOLOGY, "g_dev_orphan(%p(%s))", cp, gp->name); 36992108Sphk g_topology_assert(); 37092108Sphk if (cp->biocount > 0) 37192108Sphk return; 37292108Sphk dev = gp->softc; 37392108Sphk destroy_dev(dev); 37492108Sphk if (cp->acr > 0 || cp->acw > 0 || cp->ace > 0) 37592108Sphk g_access_rel(cp, -cp->acr, -cp->acw, -cp->ace); 37692108Sphk g_dettach(cp); 37792108Sphk g_destroy_consumer(cp); 37892108Sphk g_destroy_geom(gp); 37992108Sphk} 38092108Sphk 38192108SphkDECLARE_GEOM_METHOD(g_dev_method, g_dev) 38292108Sphk 383