geom_disk.c revision 110230
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_disk.c 110230 2003-02-02 11:59:54Z phk $ 3692108Sphk */ 3792108Sphk 38104519Sphk#include "opt_geom.h" 39104519Sphk 4092108Sphk#include <sys/param.h> 4192108Sphk#include <sys/systm.h> 4292108Sphk#include <sys/kernel.h> 4392108Sphk#include <sys/sysctl.h> 4492108Sphk#include <sys/bio.h> 4592108Sphk#include <sys/conf.h> 4692108Sphk#include <sys/disk.h> 47110119Sphk#include <sys/fcntl.h> 4892108Sphk#include <sys/malloc.h> 4992108Sphk#include <sys/sysctl.h> 50103284Sphk#include <sys/stdint.h> 5192108Sphk#include <machine/md_var.h> 5292108Sphk 5392108Sphk 5492108Sphk#include <sys/lock.h> 5592108Sphk#include <sys/mutex.h> 5692108Sphk#include <geom/geom.h> 5792108Sphk 5892108Sphkstatic g_access_t g_disk_access; 5992108Sphk 6093248Sphkstruct g_class g_disk_class = { 6197075Sphk "DISK", 6292108Sphk NULL, 6392108Sphk NULL, 6498066Sphk G_CLASS_INITIALIZER 6592108Sphk}; 6692108Sphk 67104936SphkDECLARE_GEOM_CLASS(g_disk_class, g_disk); 68104936Sphk 69110052Sphkstatic void __inline 70110052Sphkg_disk_lock_giant(struct disk *dp) 71110052Sphk{ 72110119Sphk if (dp->d_flags & DISKFLAG_NOGIANT) 73110119Sphk return; 74110119Sphk mtx_lock(&Giant); 75110052Sphk} 76110052Sphk 77110052Sphkstatic void __inline 78110052Sphkg_disk_unlock_giant(struct disk *dp) 79110052Sphk{ 80110119Sphk if (dp->d_flags & DISKFLAG_NOGIANT) 81110119Sphk return; 82110119Sphk mtx_unlock(&Giant); 83110052Sphk} 84110052Sphk 8592108Sphkstatic int 8692108Sphkg_disk_access(struct g_provider *pp, int r, int w, int e) 8792108Sphk{ 8892108Sphk struct disk *dp; 8992108Sphk dev_t dev; 9092108Sphk int error; 9192108Sphk 9292108Sphk g_trace(G_T_ACCESS, "g_disk_access(%s, %d, %d, %d)", 9392108Sphk pp->name, r, w, e); 9492108Sphk g_topology_assert(); 9592108Sphk r += pp->acr; 9692108Sphk w += pp->acw; 9792108Sphk e += pp->ace; 9892108Sphk dp = pp->geom->softc; 9992108Sphk dev = dp->d_dev; 100110119Sphk error = 0; 10192108Sphk if ((pp->acr + pp->acw + pp->ace) == 0 && (r + w + e) > 0) { 102110119Sphk if (dp->d_open != NULL) { 103110119Sphk g_disk_lock_giant(dp); 104110119Sphk error = dp->d_open(dev, FREAD | FWRITE, 0, NULL); 105110119Sphk if (error != 0) 106110119Sphk printf("Opened disk %s -> %d\n", 107110119Sphk pp->name, error); 108110119Sphk g_disk_unlock_giant(dp); 109110119Sphk } 110105551Sphk pp->mediasize = dp->d_mediasize; 111105551Sphk pp->sectorsize = dp->d_sectorsize; 112110119Sphk dp->d_flags |= DISKFLAG_OPEN; 11392108Sphk } else if ((pp->acr + pp->acw + pp->ace) > 0 && (r + w + e) == 0) { 114110119Sphk if (dp->d_close != NULL) { 115110119Sphk g_disk_lock_giant(dp); 116110119Sphk error = dp->d_close(dev, FREAD | FWRITE, 0, NULL); 117110119Sphk if (error != 0) 118110119Sphk printf("Closed disk %s -> %d\n", 119110119Sphk pp->name, error); 120110119Sphk g_disk_unlock_giant(dp); 121110119Sphk } 122110119Sphk dp->d_flags &= ~DISKFLAG_OPEN; 12392108Sphk } 12492108Sphk return (error); 12592108Sphk} 12692108Sphk 12792108Sphkstatic void 12895038Sphkg_disk_kerneldump(struct bio *bp, struct disk *dp) 12995038Sphk{ 13095038Sphk int error; 13195038Sphk struct g_kerneldump *gkd; 13295038Sphk struct dumperinfo di; 133104450Sphk struct g_geom *gp; 13495038Sphk 13595038Sphk gkd = (struct g_kerneldump*)bp->bio_data; 136104450Sphk gp = bp->bio_to->geom; 137104450Sphk g_trace(G_T_TOPOLOGY, "g_disk_kernedump(%s, %jd, %jd)", 138104450Sphk gp->name, (intmax_t)gkd->offset, (intmax_t)gkd->length); 139110119Sphk di.dumper = dp->d_dump; 14095038Sphk di.priv = dp->d_dev; 141103714Sphk di.blocksize = dp->d_sectorsize; 14295038Sphk di.mediaoffset = gkd->offset; 14395038Sphk di.mediasize = gkd->length; 14495038Sphk error = set_dumper(&di); 145104195Sphk g_io_deliver(bp, error); 14695038Sphk} 14795038Sphk 14895038Sphkstatic void 14992108Sphkg_disk_done(struct bio *bp) 15092108Sphk{ 151110052Sphk struct disk *dp; 15292108Sphk 153110230Sphk dp = bp->bio_disk; 15492108Sphk bp->bio_completed = bp->bio_length - bp->bio_resid; 155110119Sphk if (!(dp->d_flags & DISKFLAG_NOGIANT)) { 156110052Sphk DROP_GIANT(); 157110052Sphk g_std_done(bp); 158110052Sphk PICKUP_GIANT(); 159110052Sphk } else { 160110052Sphk g_std_done(bp); 161110052Sphk } 16292108Sphk} 16392108Sphk 16492108Sphkstatic void 16592108Sphkg_disk_start(struct bio *bp) 16692108Sphk{ 16792108Sphk struct bio *bp2; 16892108Sphk dev_t dev; 16992108Sphk struct disk *dp; 17092403Sphk struct g_ioctl *gio; 17192403Sphk int error; 17292108Sphk 17392108Sphk dp = bp->bio_to->geom->softc; 17492108Sphk dev = dp->d_dev; 175104609Sphk error = EJUSTRETURN; 17692108Sphk switch(bp->bio_cmd) { 177104609Sphk case BIO_DELETE: 178110119Sphk if (!(dp->d_flags & DISKFLAG_CANDELETE)) { 179104609Sphk error = 0; 180104609Sphk break; 181104609Sphk } 182104609Sphk /* fall-through */ 18392108Sphk case BIO_READ: 18492108Sphk case BIO_WRITE: 18592108Sphk bp2 = g_clone_bio(bp); 18692108Sphk bp2->bio_done = g_disk_done; 18792108Sphk bp2->bio_blkno = bp2->bio_offset >> DEV_BSHIFT; 188104609Sphk bp2->bio_pblkno = bp2->bio_offset / dp->d_sectorsize; 18992108Sphk bp2->bio_bcount = bp2->bio_length; 19092108Sphk bp2->bio_dev = dev; 191110230Sphk bp2->bio_disk = dp; 192110052Sphk g_disk_lock_giant(dp); 193110119Sphk dp->d_strategy(bp2); 194110052Sphk g_disk_unlock_giant(dp); 19592108Sphk break; 19692108Sphk case BIO_GETATTR: 197105551Sphk if (g_handleattr_int(bp, "GEOM::fwsectors", dp->d_fwsectors)) 19892403Sphk break; 199103714Sphk else if (g_handleattr_int(bp, "GEOM::fwheads", dp->d_fwheads)) 20092403Sphk break; 20198066Sphk else if (g_handleattr_off_t(bp, "GEOM::frontstuff", 0)) 20294287Sphk break; 20395038Sphk else if (!strcmp(bp->bio_attribute, "GEOM::kerneldump")) 20495038Sphk g_disk_kerneldump(bp, dp); 205110119Sphk else if (dp->d_ioctl != NULL && 206110119Sphk !strcmp(bp->bio_attribute, "GEOM::ioctl") && 20792403Sphk bp->bio_length == sizeof *gio) { 208104602Sphk gio = (struct g_ioctl *)bp->bio_data; 209110119Sphk gio->func = dp->d_ioctl; 210104602Sphk gio->dev = dp->d_dev; 211104602Sphk error = EDIRIOCTL; 21292403Sphk } else 21392403Sphk error = ENOIOCTL; 21492403Sphk break; 215104542Sphk case BIO_SETATTR: 216104542Sphk if (!strcmp(bp->bio_attribute, "GEOM::ioctl") && 217104542Sphk bp->bio_length == sizeof *gio) { 218104602Sphk gio = (struct g_ioctl *)bp->bio_data; 219104602Sphk gio->func = devsw(dp->d_dev)->d_ioctl; 220104602Sphk gio->dev = dp->d_dev; 221104602Sphk error = EDIRIOCTL; 222104542Sphk } else 223104542Sphk error = ENOIOCTL; 224104542Sphk break; 22592108Sphk default: 22692403Sphk error = EOPNOTSUPP; 22792403Sphk break; 22892403Sphk } 229104609Sphk if (error != EJUSTRETURN) 230104195Sphk g_io_deliver(bp, error); 23192403Sphk return; 23292108Sphk} 23392108Sphk 234104936Sphkstatic void 235107953Sphkg_disk_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, struct g_consumer *cp, struct g_provider *pp) 236105537Sphk{ 237105537Sphk struct disk *dp; 238105537Sphk 239105537Sphk dp = gp->softc; 240106101Sphk if (indent == NULL) { 241106101Sphk sbuf_printf(sb, " hd %u", dp->d_fwheads); 242106101Sphk sbuf_printf(sb, " sc %u", dp->d_fwsectors); 243106101Sphk return; 244106101Sphk } 245105539Sphk if (pp != NULL) { 246105537Sphk sbuf_printf(sb, "%s<fwheads>%u</fwheads>\n", 247105537Sphk indent, dp->d_fwheads); 248105537Sphk sbuf_printf(sb, "%s<fwsectors>%u</fwsectors>\n", 249105537Sphk indent, dp->d_fwsectors); 250105537Sphk } 251105537Sphk} 252105537Sphk 253105537Sphkstatic void 254104936Sphkg_disk_create(void *arg) 25592108Sphk{ 25692108Sphk struct g_geom *gp; 25792108Sphk struct g_provider *pp; 25892108Sphk dev_t dev; 25992108Sphk 260104936Sphk g_topology_assert(); 261104936Sphk dev = arg; 262104936Sphk gp = g_new_geomf(&g_disk_class, dev->si_name); 263104936Sphk gp->start = g_disk_start; 264104936Sphk gp->access = g_disk_access; 265104936Sphk gp->softc = dev->si_disk; 266105537Sphk gp->dumpconf = g_disk_dumpconf; 267104936Sphk dev->si_disk->d_softc = gp; 268104936Sphk pp = g_new_providerf(gp, "%s", gp->name); 269105551Sphk pp->mediasize = dev->si_disk->d_mediasize; 270105551Sphk pp->sectorsize = dev->si_disk->d_sectorsize; 271104936Sphk g_error_provider(pp, 0); 272105957Sphk if (bootverbose) 273105957Sphk printf("GEOM: new disk %s\n", gp->name); 274104936Sphk} 275104936Sphk 276104936Sphk 277104936Sphk 278104936Sphkdev_t 279110119Sphkdisk_create(int unit, struct disk *dp, int flags, struct cdevsw *cdevsw, void * unused __unused) 280104936Sphk{ 281104936Sphk dev_t dev; 282104936Sphk 283109623Salfred dev = g_malloc(sizeof *dev, M_ZERO); 28492108Sphk dp->d_dev = dev; 285110119Sphk dp->d_flags = flags; 28693642Sphk dp->d_devsw = cdevsw; 28792108Sphk dev->si_devsw = cdevsw; 288110119Sphk if (cdevsw != NULL) { 289110119Sphk dp->d_open = cdevsw->d_open; 290110119Sphk dp->d_close = cdevsw->d_close; 291110119Sphk dp->d_strategy = cdevsw->d_strategy; 292110119Sphk dp->d_ioctl = cdevsw->d_ioctl; 293110119Sphk dp->d_dump = (dumper_t *)cdevsw->d_dump; 294110119Sphk dp->d_name = cdevsw->d_name; 295110119Sphk } 296110119Sphk KASSERT(dp->d_strategy != NULL, ("disk_create need d_strategy")); 297110119Sphk KASSERT(dp->d_name != NULL, ("disk_create need d_name")); 298110119Sphk KASSERT(*dp->d_name != 0, ("disk_create need d_name")); 29992108Sphk dev->si_disk = dp; 300110118Sphk dev->si_udev = 0x10002; /* XXX: Needed ? */ 301110119Sphk sprintf(dev->si_name, "%s%d", dp->d_name, unit); 302104936Sphk g_call_me(g_disk_create, dev); 30392108Sphk return (dev); 30492108Sphk} 30592108Sphk 30692108Sphkvoid 30792108Sphkdisk_destroy(dev_t dev) 30892108Sphk{ 30992108Sphk struct disk *dp; 31092108Sphk struct g_geom *gp; 31192108Sphk 31292108Sphk dp = dev->si_disk; 31392108Sphk gp = dp->d_softc; 31492108Sphk g_free(dev); 31592108Sphk gp->flags |= G_GEOM_WITHER; 316110119Sphk gp->softc = NULL; 31792108Sphk g_orphan_provider(LIST_FIRST(&gp->provider), ENXIO); 31892108Sphk} 31992108Sphk 320104451Sphkstatic void 321104451Sphkg_kern_disks(void *p) 322104451Sphk{ 323104451Sphk struct sbuf *sb; 324104451Sphk struct g_geom *gp; 325104451Sphk char *sp; 326104451Sphk 327104451Sphk sb = p; 328104451Sphk sp = ""; 329104451Sphk g_topology_assert(); 330104451Sphk LIST_FOREACH(gp, &g_disk_class.geom, geom) { 331104451Sphk sbuf_printf(sb, "%s%s", sp, gp->name); 332104451Sphk sp = " "; 333104451Sphk } 334104451Sphk sbuf_finish(sb); 335104451Sphk wakeup(sb); 336104451Sphk} 337104451Sphk 338104451Sphkstatic int 339104451Sphksysctl_disks(SYSCTL_HANDLER_ARGS) 340104451Sphk{ 341104451Sphk int error; 342104451Sphk struct sbuf *sb; 343104451Sphk 344104451Sphk sb = sbuf_new(NULL, NULL, 0, SBUF_AUTOEXTEND); 345104451Sphk sbuf_clear(sb); 346104451Sphk g_call_me(g_kern_disks, sb); 347104451Sphk do { 348104451Sphk tsleep(sb, PZERO, "kern.disks", hz); 349104451Sphk } while(!sbuf_done(sb)); 350105350Sphk error = SYSCTL_OUT(req, sbuf_data(sb), sbuf_len(sb) + 1); 351104451Sphk sbuf_delete(sb); 352104451Sphk return error; 353104451Sphk} 354104451Sphk 355104451SphkSYSCTL_PROC(_kern, OID_AUTO, disks, CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_NOLOCK, 0, 0, 356104451Sphk sysctl_disks, "A", "names of available disks"); 357104519Sphk 358