geom_disk.c revision 105350
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 105350 2002-10-17 19:27:02Z 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 69DECLARE_GEOM_CLASS(g_disk_class, g_disk); 70 71static int 72g_disk_access(struct g_provider *pp, int r, int w, int e) 73{ 74 struct disk *dp; 75 dev_t dev; 76 int error; 77 78 g_trace(G_T_ACCESS, "g_disk_access(%s, %d, %d, %d)", 79 pp->name, r, w, e); 80 g_topology_assert(); 81 r += pp->acr; 82 w += pp->acw; 83 e += pp->ace; 84 dp = pp->geom->softc; 85 dev = dp->d_dev; 86 if ((pp->acr + pp->acw + pp->ace) == 0 && (r + w + e) > 0) { 87 mtx_lock(&Giant); 88 error = devsw(dev)->d_open(dev, 3, 0, NULL); 89 if (error != 0) 90 printf("Opened disk %s -> %d\n", pp->name, error); 91 mtx_unlock(&Giant); 92 } else if ((pp->acr + pp->acw + pp->ace) > 0 && (r + w + e) == 0) { 93 mtx_lock(&Giant); 94 error = devsw(dev)->d_close(dev, 3, 0, NULL); 95 if (error != 0) 96 printf("Closed disk %s -> %d\n", pp->name, error); 97 mtx_unlock(&Giant); 98 } else { 99 error = 0; 100 } 101 pp->mediasize = dp->d_mediasize; 102 return (error); 103} 104 105static void 106g_disk_kerneldump(struct bio *bp, struct disk *dp) 107{ 108 int error; 109 struct g_kerneldump *gkd; 110 struct dumperinfo di; 111 struct g_geom *gp; 112 113 gkd = (struct g_kerneldump*)bp->bio_data; 114 gp = bp->bio_to->geom; 115 g_trace(G_T_TOPOLOGY, "g_disk_kernedump(%s, %jd, %jd)", 116 gp->name, (intmax_t)gkd->offset, (intmax_t)gkd->length); 117 di.dumper = (dumper_t *)dp->d_devsw->d_dump; 118 di.priv = dp->d_dev; 119 di.blocksize = dp->d_sectorsize; 120 di.mediaoffset = gkd->offset; 121 di.mediasize = gkd->length; 122 error = set_dumper(&di); 123 g_io_deliver(bp, error); 124} 125 126static void 127g_disk_done(struct bio *bp) 128{ 129 130 mtx_unlock(&Giant); 131 bp->bio_completed = bp->bio_length - bp->bio_resid; 132 g_std_done(bp); 133 mtx_lock(&Giant); 134} 135 136static void 137g_disk_start(struct bio *bp) 138{ 139 struct bio *bp2; 140 dev_t dev; 141 struct disk *dp; 142 struct g_ioctl *gio; 143 int error; 144 145 dp = bp->bio_to->geom->softc; 146 dev = dp->d_dev; 147 error = EJUSTRETURN; 148 switch(bp->bio_cmd) { 149 case BIO_DELETE: 150 if (!(devsw(dev)->d_flags & D_CANFREE)) { 151 error = 0; 152 break; 153 } 154 /* fall-through */ 155 case BIO_READ: 156 case BIO_WRITE: 157 bp2 = g_clone_bio(bp); 158 bp2->bio_done = g_disk_done; 159 bp2->bio_blkno = bp2->bio_offset >> DEV_BSHIFT; 160 bp2->bio_pblkno = bp2->bio_offset / dp->d_sectorsize; 161 bp2->bio_bcount = bp2->bio_length; 162 bp2->bio_dev = dev; 163 mtx_lock(&Giant); 164 devsw(dev)->d_strategy(bp2); 165 mtx_unlock(&Giant); 166 break; 167 case BIO_GETATTR: 168 if (g_handleattr_int(bp, "GEOM::sectorsize", dp->d_sectorsize)) 169 break; 170 else if (g_handleattr_int(bp, "GEOM::fwsectors", dp->d_fwsectors)) 171 break; 172 else if (g_handleattr_int(bp, "GEOM::fwheads", dp->d_fwheads)) 173 break; 174 else if (g_handleattr_off_t(bp, "GEOM::mediasize", dp->d_mediasize)) 175 break; 176 else if (g_handleattr_off_t(bp, "GEOM::frontstuff", 0)) 177 break; 178 else if (!strcmp(bp->bio_attribute, "GEOM::kerneldump")) 179 g_disk_kerneldump(bp, dp); 180 else if (!strcmp(bp->bio_attribute, "GEOM::ioctl") && 181 bp->bio_length == sizeof *gio) { 182 gio = (struct g_ioctl *)bp->bio_data; 183 gio->func = devsw(dp->d_dev)->d_ioctl; 184 gio->dev = dp->d_dev; 185 error = EDIRIOCTL; 186 } else 187 error = ENOIOCTL; 188 break; 189 case BIO_SETATTR: 190 if (!strcmp(bp->bio_attribute, "GEOM::ioctl") && 191 bp->bio_length == sizeof *gio) { 192 gio = (struct g_ioctl *)bp->bio_data; 193 gio->func = devsw(dp->d_dev)->d_ioctl; 194 gio->dev = dp->d_dev; 195 error = EDIRIOCTL; 196 } else 197 error = ENOIOCTL; 198 break; 199 default: 200 error = EOPNOTSUPP; 201 break; 202 } 203 if (error != EJUSTRETURN) 204 g_io_deliver(bp, error); 205 return; 206} 207 208static void 209g_disk_create(void *arg) 210{ 211 struct g_geom *gp; 212 struct g_provider *pp; 213 dev_t dev; 214 215 g_topology_assert(); 216 dev = arg; 217 gp = g_new_geomf(&g_disk_class, dev->si_name); 218 gp->start = g_disk_start; 219 gp->access = g_disk_access; 220 gp->softc = dev->si_disk; 221 dev->si_disk->d_softc = gp; 222 pp = g_new_providerf(gp, "%s", gp->name); 223 g_error_provider(pp, 0); 224} 225 226 227 228dev_t 229disk_create(int unit, struct disk *dp, int flags, struct cdevsw *cdevsw, struct cdevsw *proto) 230{ 231 dev_t dev; 232 233 dev = g_malloc(sizeof *dev, M_WAITOK | M_ZERO); 234 dp->d_dev = dev; 235 dp->d_devsw = cdevsw; 236 dev->si_devsw = cdevsw; 237 dev->si_disk = dp; 238 dev->si_udev = dkmakeminor(unit, WHOLE_DISK_SLICE, RAW_PART); 239 sprintf(dev->si_name, "%s%d", cdevsw->d_name, unit); 240 g_call_me(g_disk_create, dev); 241 return (dev); 242} 243 244void disk_dev_synth(dev_t dev); 245 246void 247disk_dev_synth(dev_t dev) 248{ 249 250 return; 251} 252 253void 254disk_destroy(dev_t dev) 255{ 256 struct disk *dp; 257 struct g_geom *gp; 258 259 dp = dev->si_disk; 260 gp = dp->d_softc; 261 g_free(dev); 262 gp->flags |= G_GEOM_WITHER; 263 g_orphan_provider(LIST_FIRST(&gp->provider), ENXIO); 264} 265 266void 267disk_invalidate (struct disk *disk) 268{ 269} 270 271static void 272g_kern_disks(void *p) 273{ 274 struct sbuf *sb; 275 struct g_geom *gp; 276 char *sp; 277 278 sb = p; 279 sp = ""; 280 g_topology_assert(); 281 LIST_FOREACH(gp, &g_disk_class.geom, geom) { 282 sbuf_printf(sb, "%s%s", sp, gp->name); 283 sp = " "; 284 } 285 sbuf_finish(sb); 286 wakeup(sb); 287} 288 289static int 290sysctl_disks(SYSCTL_HANDLER_ARGS) 291{ 292 int error; 293 struct sbuf *sb; 294 295 sb = sbuf_new(NULL, NULL, 0, SBUF_AUTOEXTEND); 296 sbuf_clear(sb); 297 g_call_me(g_kern_disks, sb); 298 do { 299 tsleep(sb, PZERO, "kern.disks", hz); 300 } while(!sbuf_done(sb)); 301 error = SYSCTL_OUT(req, sbuf_data(sb), sbuf_len(sb) + 1); 302 sbuf_delete(sb); 303 return error; 304} 305 306SYSCTL_PROC(_kern, OID_AUTO, disks, CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_NOLOCK, 0, 0, 307 sysctl_disks, "A", "names of available disks"); 308 309#endif 310