geom_disk.c revision 104542
1/*- 2 * Copyright (c) 2002 Poul-Henning Kamp 3 * Copyright (c) 2002 Networks Associates Technology, Inc. 4 * All rights reserved. 5 * 6 * This software was developed for the FreeBSD Project by Poul-Henning Kamp 7 * and NAI Labs, the Security Research Division of Network Associates, Inc. 8 * under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the 9 * DARPA CHATS research program. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. The names of the authors may not be used to endorse or promote 20 * products derived from this software without specific prior written 21 * permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 * $FreeBSD: head/sys/geom/geom_disk.c 104542 2002-10-05 21:55:31Z phk $ 36 */ 37 38#include "opt_geom.h" 39#ifndef NO_GEOM 40 41#include <sys/param.h> 42#include <sys/systm.h> 43#include <sys/kernel.h> 44#include <sys/sysctl.h> 45#include <sys/bio.h> 46#include <sys/conf.h> 47#include <sys/disk.h> 48#include <sys/diskslice.h> 49#include <sys/disklabel.h> 50#include <sys/malloc.h> 51#include <sys/sysctl.h> 52#include <sys/stdint.h> 53#include <machine/md_var.h> 54 55 56#include <sys/lock.h> 57#include <sys/mutex.h> 58#include <geom/geom.h> 59 60static g_access_t g_disk_access; 61 62struct g_class g_disk_class = { 63 "DISK", 64 NULL, 65 NULL, 66 G_CLASS_INITIALIZER 67}; 68 69static int 70g_disk_access(struct g_provider *pp, int r, int w, int e) 71{ 72 struct disk *dp; 73 dev_t dev; 74 int error; 75 76 g_trace(G_T_ACCESS, "g_disk_access(%s, %d, %d, %d)", 77 pp->name, r, w, e); 78 g_topology_assert(); 79 r += pp->acr; 80 w += pp->acw; 81 e += pp->ace; 82 dp = pp->geom->softc; 83 dev = dp->d_dev; 84 if ((pp->acr + pp->acw + pp->ace) == 0 && (r + w + e) > 0) { 85 mtx_lock(&Giant); 86 error = devsw(dev)->d_open(dev, 3, 0, NULL); 87 if (error != 0) 88 printf("Opened disk %s -> %d\n", pp->name, error); 89 mtx_unlock(&Giant); 90 } else if ((pp->acr + pp->acw + pp->ace) > 0 && (r + w + e) == 0) { 91 mtx_lock(&Giant); 92 error = devsw(dev)->d_close(dev, 3, 0, NULL); 93 if (error != 0) 94 printf("Closed disk %s -> %d\n", pp->name, error); 95 mtx_unlock(&Giant); 96 } else { 97 error = 0; 98 } 99 pp->mediasize = dp->d_mediasize; 100 return (error); 101} 102 103static void 104g_disk_kerneldump(struct bio *bp, struct disk *dp) 105{ 106 int error; 107 struct g_kerneldump *gkd; 108 struct dumperinfo di; 109 struct g_geom *gp; 110 111 gkd = (struct g_kerneldump*)bp->bio_data; 112 gp = bp->bio_to->geom; 113 g_trace(G_T_TOPOLOGY, "g_disk_kernedump(%s, %jd, %jd)", 114 gp->name, (intmax_t)gkd->offset, (intmax_t)gkd->length); 115 di.dumper = (dumper_t *)dp->d_devsw->d_dump; 116 di.priv = dp->d_dev; 117 di.blocksize = dp->d_sectorsize; 118 di.mediaoffset = gkd->offset; 119 di.mediasize = gkd->length; 120 error = set_dumper(&di); 121 g_io_deliver(bp, error); 122} 123 124static void 125g_disk_done(struct bio *bp) 126{ 127 128 mtx_unlock(&Giant); 129 bp->bio_completed = bp->bio_length - bp->bio_resid; 130 g_std_done(bp); 131 mtx_lock(&Giant); 132} 133 134static void 135g_disk_ioctl(void *arg) 136{ 137 struct bio *bp; 138 dev_t dev; 139 struct disk *dp; 140 struct g_ioctl *gio; 141 int error; 142 143 bp = arg; 144 dp = bp->bio_to->geom->softc; 145 dev = dp->d_dev; 146 gio = (struct g_ioctl *)bp->bio_data; 147 mtx_lock(&Giant); 148 error = devsw(dev)->d_ioctl(dev, gio->cmd, 149 gio->data, gio->fflag, gio->td); 150 mtx_unlock(&Giant); 151 g_io_deliver(bp, error); 152} 153 154static void 155g_disk_start(struct bio *bp) 156{ 157 struct bio *bp2; 158 dev_t dev; 159 struct disk *dp; 160 struct g_ioctl *gio; 161 int error; 162 163 dp = bp->bio_to->geom->softc; 164 dev = dp->d_dev; 165 error = 0; 166 switch(bp->bio_cmd) { 167 case BIO_READ: 168 case BIO_WRITE: 169 bp2 = g_clone_bio(bp); 170 bp2->bio_done = g_disk_done; 171 bp2->bio_blkno = bp2->bio_offset >> DEV_BSHIFT; 172 bp2->bio_pblkno = bp2->bio_blkno; 173 bp2->bio_bcount = bp2->bio_length; 174 bp2->bio_dev = dev; 175 mtx_lock(&Giant); 176 devsw(dev)->d_strategy(bp2); 177 mtx_unlock(&Giant); 178 break; 179 case BIO_GETATTR: 180 if (g_handleattr_int(bp, "GEOM::sectorsize", dp->d_sectorsize)) 181 break; 182 else if (g_handleattr_int(bp, "GEOM::fwsectors", dp->d_fwsectors)) 183 break; 184 else if (g_handleattr_int(bp, "GEOM::fwheads", dp->d_fwheads)) 185 break; 186 else if (g_handleattr_off_t(bp, "GEOM::mediasize", dp->d_mediasize)) 187 break; 188 else if (g_handleattr_off_t(bp, "GEOM::frontstuff", 0)) 189 break; 190 else if (!strcmp(bp->bio_attribute, "GEOM::kerneldump")) 191 g_disk_kerneldump(bp, dp); 192 else if (!strcmp(bp->bio_attribute, "GEOM::ioctl") && 193 bp->bio_length == sizeof *gio) { 194 g_call_me(g_disk_ioctl, bp); 195 return; 196 } else 197 error = ENOIOCTL; 198 break; 199 case BIO_SETATTR: 200 if (!strcmp(bp->bio_attribute, "GEOM::ioctl") && 201 bp->bio_length == sizeof *gio) { 202 g_call_me(g_disk_ioctl, bp); 203 return; 204 } else 205 error = ENOIOCTL; 206 break; 207 default: 208 error = EOPNOTSUPP; 209 break; 210 } 211 if (error) { 212 g_io_deliver(bp, error); 213 } 214 return; 215} 216 217dev_t 218disk_create(int unit, struct disk *dp, int flags, struct cdevsw *cdevsw, struct cdevsw *proto) 219{ 220 static int once; 221 struct g_geom *gp; 222 struct g_provider *pp; 223 dev_t dev; 224 225 mtx_unlock(&Giant); 226 if (!once) { 227 g_add_class(&g_disk_class); 228 once++; 229 } 230 dev = g_malloc(sizeof *dev, M_WAITOK | M_ZERO); 231 dp->d_dev = dev; 232 dp->d_devsw = cdevsw; 233 dev->si_devsw = cdevsw; 234 dev->si_disk = dp; 235 dev->si_udev = dkmakeminor(unit, WHOLE_DISK_SLICE, RAW_PART); 236 g_topology_lock(); 237 gp = g_new_geomf(&g_disk_class, "%s%d", cdevsw->d_name, unit); 238 strcpy(dev->si_name, gp->name); 239 gp->start = g_disk_start; 240 gp->access = g_disk_access; 241 gp->softc = dp; 242 dp->d_softc = gp; 243 pp = g_new_providerf(gp, "%s", gp->name); 244 g_error_provider(pp, 0); 245 g_topology_unlock(); 246 mtx_lock(&Giant); 247 return (dev); 248} 249 250void disk_dev_synth(dev_t dev); 251 252void 253disk_dev_synth(dev_t dev) 254{ 255 256 return; 257} 258 259void 260disk_destroy(dev_t dev) 261{ 262 struct disk *dp; 263 struct g_geom *gp; 264 265 dp = dev->si_disk; 266 gp = dp->d_softc; 267 g_free(dev); 268 gp->flags |= G_GEOM_WITHER; 269 g_orphan_provider(LIST_FIRST(&gp->provider), ENXIO); 270} 271 272void 273disk_invalidate (struct disk *disk) 274{ 275} 276 277static void 278g_kern_disks(void *p) 279{ 280 struct sbuf *sb; 281 struct g_geom *gp; 282 char *sp; 283 284 sb = p; 285 sp = ""; 286 g_topology_assert(); 287 LIST_FOREACH(gp, &g_disk_class.geom, geom) { 288 sbuf_printf(sb, "%s%s", sp, gp->name); 289 sp = " "; 290 } 291 sbuf_finish(sb); 292 wakeup(sb); 293} 294 295static int 296sysctl_disks(SYSCTL_HANDLER_ARGS) 297{ 298 int error; 299 struct sbuf *sb; 300 301 sb = sbuf_new(NULL, NULL, 0, SBUF_AUTOEXTEND); 302 sbuf_clear(sb); 303 g_call_me(g_kern_disks, sb); 304 do { 305 tsleep(sb, PZERO, "kern.disks", hz); 306 } while(!sbuf_done(sb)); 307 error = SYSCTL_OUT(req, sbuf_data(sb), sbuf_len(sb)); 308 sbuf_delete(sb); 309 return error; 310} 311 312SYSCTL_PROC(_kern, OID_AUTO, disks, CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_NOLOCK, 0, 0, 313 sysctl_disks, "A", "names of available disks"); 314 315#endif 316