geom_disk.c revision 110118
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 110118 2003-01-30 19:55:19Z 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> 4792108Sphk#include <sys/malloc.h> 4892108Sphk#include <sys/sysctl.h> 49103284Sphk#include <sys/stdint.h> 5092108Sphk#include <machine/md_var.h> 5192108Sphk 5292108Sphk 5392108Sphk#include <sys/lock.h> 5492108Sphk#include <sys/mutex.h> 5592108Sphk#include <geom/geom.h> 5692108Sphk 5792108Sphkstatic g_access_t g_disk_access; 5892108Sphk 5993248Sphkstruct g_class g_disk_class = { 6097075Sphk "DISK", 6192108Sphk NULL, 6292108Sphk NULL, 6398066Sphk G_CLASS_INITIALIZER 6492108Sphk}; 6592108Sphk 66104936SphkDECLARE_GEOM_CLASS(g_disk_class, g_disk); 67104936Sphk 68110052Sphkstatic void __inline 69110052Sphkg_disk_lock_giant(struct disk *dp) 70110052Sphk{ 71110052Sphk if (!(dp->d_devsw->d_flags & D_NOGIANT)) 72110052Sphk mtx_lock(&Giant); 73110052Sphk} 74110052Sphk 75110052Sphkstatic void __inline 76110052Sphkg_disk_unlock_giant(struct disk *dp) 77110052Sphk{ 78110052Sphk if (!(dp->d_devsw->d_flags & D_NOGIANT)) 79110052Sphk mtx_unlock(&Giant); 80110052Sphk} 81110052Sphk 8292108Sphkstatic int 8392108Sphkg_disk_access(struct g_provider *pp, int r, int w, int e) 8492108Sphk{ 8592108Sphk struct disk *dp; 8692108Sphk dev_t dev; 8792108Sphk int error; 8892108Sphk 8992108Sphk g_trace(G_T_ACCESS, "g_disk_access(%s, %d, %d, %d)", 9092108Sphk pp->name, r, w, e); 9192108Sphk g_topology_assert(); 9292108Sphk r += pp->acr; 9392108Sphk w += pp->acw; 9492108Sphk e += pp->ace; 9592108Sphk dp = pp->geom->softc; 9692108Sphk dev = dp->d_dev; 9792108Sphk if ((pp->acr + pp->acw + pp->ace) == 0 && (r + w + e) > 0) { 98110052Sphk g_disk_lock_giant(dp); 9992108Sphk error = devsw(dev)->d_open(dev, 3, 0, NULL); 10092108Sphk if (error != 0) 10192108Sphk printf("Opened disk %s -> %d\n", pp->name, error); 102110052Sphk g_disk_unlock_giant(dp); 103105551Sphk pp->mediasize = dp->d_mediasize; 104105551Sphk pp->sectorsize = dp->d_sectorsize; 10592108Sphk } else if ((pp->acr + pp->acw + pp->ace) > 0 && (r + w + e) == 0) { 106110052Sphk g_disk_lock_giant(dp); 10792108Sphk error = devsw(dev)->d_close(dev, 3, 0, NULL); 10892108Sphk if (error != 0) 10992108Sphk printf("Closed disk %s -> %d\n", pp->name, error); 110110052Sphk g_disk_unlock_giant(dp); 11192108Sphk } else { 11292108Sphk error = 0; 11392108Sphk } 11492108Sphk return (error); 11592108Sphk} 11692108Sphk 11792108Sphkstatic void 11895038Sphkg_disk_kerneldump(struct bio *bp, struct disk *dp) 11995038Sphk{ 12095038Sphk int error; 12195038Sphk struct g_kerneldump *gkd; 12295038Sphk struct dumperinfo di; 123104450Sphk struct g_geom *gp; 12495038Sphk 12595038Sphk gkd = (struct g_kerneldump*)bp->bio_data; 126104450Sphk gp = bp->bio_to->geom; 127104450Sphk g_trace(G_T_TOPOLOGY, "g_disk_kernedump(%s, %jd, %jd)", 128104450Sphk gp->name, (intmax_t)gkd->offset, (intmax_t)gkd->length); 12995038Sphk di.dumper = (dumper_t *)dp->d_devsw->d_dump; 13095038Sphk di.priv = dp->d_dev; 131103714Sphk di.blocksize = dp->d_sectorsize; 13295038Sphk di.mediaoffset = gkd->offset; 13395038Sphk di.mediasize = gkd->length; 13495038Sphk error = set_dumper(&di); 135104195Sphk g_io_deliver(bp, error); 13695038Sphk} 13795038Sphk 13895038Sphkstatic void 13992108Sphkg_disk_done(struct bio *bp) 14092108Sphk{ 141110052Sphk struct disk *dp; 14292108Sphk 143110052Sphk dp = bp->bio_caller1; 14492108Sphk bp->bio_completed = bp->bio_length - bp->bio_resid; 145110052Sphk if (!(dp->d_devsw->d_flags & D_NOGIANT)) { 146110052Sphk DROP_GIANT(); 147110052Sphk g_std_done(bp); 148110052Sphk PICKUP_GIANT(); 149110052Sphk } else { 150110052Sphk g_std_done(bp); 151110052Sphk } 15292108Sphk} 15392108Sphk 15492108Sphkstatic void 15592108Sphkg_disk_start(struct bio *bp) 15692108Sphk{ 15792108Sphk struct bio *bp2; 15892108Sphk dev_t dev; 15992108Sphk struct disk *dp; 16092403Sphk struct g_ioctl *gio; 16192403Sphk int error; 16292108Sphk 16392108Sphk dp = bp->bio_to->geom->softc; 16492108Sphk dev = dp->d_dev; 165104609Sphk error = EJUSTRETURN; 16692108Sphk switch(bp->bio_cmd) { 167104609Sphk case BIO_DELETE: 168104609Sphk if (!(devsw(dev)->d_flags & D_CANFREE)) { 169104609Sphk error = 0; 170104609Sphk break; 171104609Sphk } 172104609Sphk /* fall-through */ 17392108Sphk case BIO_READ: 17492108Sphk case BIO_WRITE: 17592108Sphk bp2 = g_clone_bio(bp); 17692108Sphk bp2->bio_done = g_disk_done; 17792108Sphk bp2->bio_blkno = bp2->bio_offset >> DEV_BSHIFT; 178104609Sphk bp2->bio_pblkno = bp2->bio_offset / dp->d_sectorsize; 17992108Sphk bp2->bio_bcount = bp2->bio_length; 18092108Sphk bp2->bio_dev = dev; 181110052Sphk bp2->bio_caller1 = dp; 182110052Sphk g_disk_lock_giant(dp); 18392108Sphk devsw(dev)->d_strategy(bp2); 184110052Sphk g_disk_unlock_giant(dp); 18592108Sphk break; 18692108Sphk case BIO_GETATTR: 187105551Sphk if (g_handleattr_int(bp, "GEOM::fwsectors", dp->d_fwsectors)) 18892403Sphk break; 189103714Sphk else if (g_handleattr_int(bp, "GEOM::fwheads", dp->d_fwheads)) 19092403Sphk break; 19198066Sphk else if (g_handleattr_off_t(bp, "GEOM::frontstuff", 0)) 19294287Sphk break; 19395038Sphk else if (!strcmp(bp->bio_attribute, "GEOM::kerneldump")) 19495038Sphk g_disk_kerneldump(bp, dp); 19592403Sphk else if (!strcmp(bp->bio_attribute, "GEOM::ioctl") && 19692403Sphk bp->bio_length == sizeof *gio) { 197104602Sphk gio = (struct g_ioctl *)bp->bio_data; 198104602Sphk gio->func = devsw(dp->d_dev)->d_ioctl; 199104602Sphk gio->dev = dp->d_dev; 200104602Sphk error = EDIRIOCTL; 20192403Sphk } else 20292403Sphk error = ENOIOCTL; 20392403Sphk break; 204104542Sphk case BIO_SETATTR: 205104542Sphk if (!strcmp(bp->bio_attribute, "GEOM::ioctl") && 206104542Sphk bp->bio_length == sizeof *gio) { 207104602Sphk gio = (struct g_ioctl *)bp->bio_data; 208104602Sphk gio->func = devsw(dp->d_dev)->d_ioctl; 209104602Sphk gio->dev = dp->d_dev; 210104602Sphk error = EDIRIOCTL; 211104542Sphk } else 212104542Sphk error = ENOIOCTL; 213104542Sphk break; 21492108Sphk default: 21592403Sphk error = EOPNOTSUPP; 21692403Sphk break; 21792403Sphk } 218104609Sphk if (error != EJUSTRETURN) 219104195Sphk g_io_deliver(bp, error); 22092403Sphk return; 22192108Sphk} 22292108Sphk 223104936Sphkstatic void 224107953Sphkg_disk_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, struct g_consumer *cp, struct g_provider *pp) 225105537Sphk{ 226105537Sphk struct disk *dp; 227105537Sphk 228105537Sphk dp = gp->softc; 229106101Sphk if (indent == NULL) { 230106101Sphk sbuf_printf(sb, " hd %u", dp->d_fwheads); 231106101Sphk sbuf_printf(sb, " sc %u", dp->d_fwsectors); 232106101Sphk return; 233106101Sphk } 234105539Sphk if (pp != NULL) { 235105537Sphk sbuf_printf(sb, "%s<fwheads>%u</fwheads>\n", 236105537Sphk indent, dp->d_fwheads); 237105537Sphk sbuf_printf(sb, "%s<fwsectors>%u</fwsectors>\n", 238105537Sphk indent, dp->d_fwsectors); 239105537Sphk } 240105537Sphk} 241105537Sphk 242105537Sphkstatic void 243104936Sphkg_disk_create(void *arg) 24492108Sphk{ 24592108Sphk struct g_geom *gp; 24692108Sphk struct g_provider *pp; 24792108Sphk dev_t dev; 24892108Sphk 249104936Sphk g_topology_assert(); 250104936Sphk dev = arg; 251104936Sphk gp = g_new_geomf(&g_disk_class, dev->si_name); 252104936Sphk gp->start = g_disk_start; 253104936Sphk gp->access = g_disk_access; 254104936Sphk gp->softc = dev->si_disk; 255105537Sphk gp->dumpconf = g_disk_dumpconf; 256104936Sphk dev->si_disk->d_softc = gp; 257104936Sphk pp = g_new_providerf(gp, "%s", gp->name); 258105551Sphk pp->mediasize = dev->si_disk->d_mediasize; 259105551Sphk pp->sectorsize = dev->si_disk->d_sectorsize; 260104936Sphk g_error_provider(pp, 0); 261105957Sphk if (bootverbose) 262105957Sphk printf("GEOM: new disk %s\n", gp->name); 263104936Sphk} 264104936Sphk 265104936Sphk 266104936Sphk 267104936Sphkdev_t 268110081Sphkdisk_create(int unit, struct disk *dp, int flags, struct cdevsw *cdevsw, void *unused) 269104936Sphk{ 270104936Sphk dev_t dev; 271104936Sphk 272109623Salfred dev = g_malloc(sizeof *dev, M_ZERO); 27392108Sphk dp->d_dev = dev; 27493642Sphk dp->d_devsw = cdevsw; 27592108Sphk dev->si_devsw = cdevsw; 27692108Sphk dev->si_disk = dp; 277110118Sphk dev->si_udev = 0x10002; /* XXX: Needed ? */ 278104936Sphk sprintf(dev->si_name, "%s%d", cdevsw->d_name, unit); 279104936Sphk g_call_me(g_disk_create, dev); 28092108Sphk return (dev); 28192108Sphk} 28292108Sphk 28392108Sphkvoid 28492108Sphkdisk_destroy(dev_t dev) 28592108Sphk{ 28692108Sphk struct disk *dp; 28792108Sphk struct g_geom *gp; 28892108Sphk 28992108Sphk dp = dev->si_disk; 29092108Sphk gp = dp->d_softc; 29192108Sphk g_free(dev); 29292108Sphk gp->flags |= G_GEOM_WITHER; 29392108Sphk g_orphan_provider(LIST_FIRST(&gp->provider), ENXIO); 29492108Sphk} 29592108Sphk 296104451Sphkstatic void 297104451Sphkg_kern_disks(void *p) 298104451Sphk{ 299104451Sphk struct sbuf *sb; 300104451Sphk struct g_geom *gp; 301104451Sphk char *sp; 302104451Sphk 303104451Sphk sb = p; 304104451Sphk sp = ""; 305104451Sphk g_topology_assert(); 306104451Sphk LIST_FOREACH(gp, &g_disk_class.geom, geom) { 307104451Sphk sbuf_printf(sb, "%s%s", sp, gp->name); 308104451Sphk sp = " "; 309104451Sphk } 310104451Sphk sbuf_finish(sb); 311104451Sphk wakeup(sb); 312104451Sphk} 313104451Sphk 314104451Sphkstatic int 315104451Sphksysctl_disks(SYSCTL_HANDLER_ARGS) 316104451Sphk{ 317104451Sphk int error; 318104451Sphk struct sbuf *sb; 319104451Sphk 320104451Sphk sb = sbuf_new(NULL, NULL, 0, SBUF_AUTOEXTEND); 321104451Sphk sbuf_clear(sb); 322104451Sphk g_call_me(g_kern_disks, sb); 323104451Sphk do { 324104451Sphk tsleep(sb, PZERO, "kern.disks", hz); 325104451Sphk } while(!sbuf_done(sb)); 326105350Sphk error = SYSCTL_OUT(req, sbuf_data(sb), sbuf_len(sb) + 1); 327104451Sphk sbuf_delete(sb); 328104451Sphk return error; 329104451Sphk} 330104451Sphk 331104451SphkSYSCTL_PROC(_kern, OID_AUTO, disks, CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_NOLOCK, 0, 0, 332104451Sphk sysctl_disks, "A", "names of available disks"); 333104519Sphk 334