geom_disk.c revision 104451
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 104451 2002-10-04 10:15:26Z phk $ 36 */ 37 38#include <sys/param.h> 39#include <sys/systm.h> 40#include <sys/kernel.h> 41#include <sys/sysctl.h> 42#include <sys/bio.h> 43#include <sys/conf.h> 44#include <sys/disk.h> 45#include <sys/diskslice.h> 46#include <sys/disklabel.h> 47#include <sys/malloc.h> 48#include <sys/sysctl.h> 49#include <sys/stdint.h> 50#include <machine/md_var.h> 51 52 53#include <sys/lock.h> 54#include <sys/mutex.h> 55#include <geom/geom.h> 56 57static g_access_t g_disk_access; 58 59struct g_class g_disk_class = { 60 "DISK", 61 NULL, 62 NULL, 63 G_CLASS_INITIALIZER 64}; 65 66static int 67g_disk_access(struct g_provider *pp, int r, int w, int e) 68{ 69 struct disk *dp; 70 dev_t dev; 71 int error; 72 73 g_trace(G_T_ACCESS, "g_disk_access(%s, %d, %d, %d)", 74 pp->name, r, w, e); 75 g_topology_assert(); 76 r += pp->acr; 77 w += pp->acw; 78 e += pp->ace; 79 dp = pp->geom->softc; 80 dev = dp->d_dev; 81 if ((pp->acr + pp->acw + pp->ace) == 0 && (r + w + e) > 0) { 82 mtx_lock(&Giant); 83 error = devsw(dev)->d_open(dev, 3, 0, NULL); 84 if (error != 0) 85 printf("Opened disk %s -> %d\n", pp->name, error); 86 mtx_unlock(&Giant); 87 } else if ((pp->acr + pp->acw + pp->ace) > 0 && (r + w + e) == 0) { 88 mtx_lock(&Giant); 89 error = devsw(dev)->d_close(dev, 3, 0, NULL); 90 if (error != 0) 91 printf("Closed disk %s -> %d\n", pp->name, error); 92 mtx_unlock(&Giant); 93 } else { 94 error = 0; 95 } 96 pp->mediasize = dp->d_mediasize; 97 return (error); 98} 99 100static void 101g_disk_kerneldump(struct bio *bp, struct disk *dp) 102{ 103 int error; 104 struct g_kerneldump *gkd; 105 struct dumperinfo di; 106 struct g_geom *gp; 107 108 gkd = (struct g_kerneldump*)bp->bio_data; 109 gp = bp->bio_to->geom; 110 g_trace(G_T_TOPOLOGY, "g_disk_kernedump(%s, %jd, %jd)", 111 gp->name, (intmax_t)gkd->offset, (intmax_t)gkd->length); 112 di.dumper = (dumper_t *)dp->d_devsw->d_dump; 113 di.priv = dp->d_dev; 114 di.blocksize = dp->d_sectorsize; 115 di.mediaoffset = gkd->offset; 116 di.mediasize = gkd->length; 117 error = set_dumper(&di); 118 g_io_deliver(bp, error); 119} 120 121static void 122g_disk_done(struct bio *bp) 123{ 124 125 mtx_unlock(&Giant); 126 bp->bio_completed = bp->bio_length - bp->bio_resid; 127 g_std_done(bp); 128 mtx_lock(&Giant); 129} 130 131static void 132g_disk_ioctl(void *arg) 133{ 134 struct bio *bp; 135 dev_t dev; 136 struct disk *dp; 137 struct g_ioctl *gio; 138 int error; 139 140 bp = arg; 141 dp = bp->bio_to->geom->softc; 142 dev = dp->d_dev; 143 gio = (struct g_ioctl *)bp->bio_data; 144 mtx_lock(&Giant); 145 error = devsw(dev)->d_ioctl(dev, gio->cmd, 146 gio->data, gio->fflag, gio->td); 147 mtx_unlock(&Giant); 148 g_io_deliver(bp, error); 149} 150 151static void 152g_disk_start(struct bio *bp) 153{ 154 struct bio *bp2; 155 dev_t dev; 156 struct disk *dp; 157 struct g_ioctl *gio; 158 int error; 159 160 dp = bp->bio_to->geom->softc; 161 dev = dp->d_dev; 162 error = 0; 163 switch(bp->bio_cmd) { 164 case BIO_READ: 165 case BIO_WRITE: 166 bp2 = g_clone_bio(bp); 167 bp2->bio_done = g_disk_done; 168 bp2->bio_blkno = bp2->bio_offset >> DEV_BSHIFT; 169 bp2->bio_pblkno = bp2->bio_blkno; 170 bp2->bio_bcount = bp2->bio_length; 171 bp2->bio_dev = dev; 172 mtx_lock(&Giant); 173 devsw(dev)->d_strategy(bp2); 174 mtx_unlock(&Giant); 175 break; 176 case BIO_GETATTR: 177 if (g_handleattr_int(bp, "GEOM::sectorsize", dp->d_sectorsize)) 178 break; 179 else if (g_handleattr_int(bp, "GEOM::fwsectors", dp->d_fwsectors)) 180 break; 181 else if (g_handleattr_int(bp, "GEOM::fwheads", dp->d_fwheads)) 182 break; 183 else if (g_handleattr_off_t(bp, "GEOM::mediasize", dp->d_mediasize)) 184 break; 185 else if (g_handleattr_off_t(bp, "GEOM::frontstuff", 0)) 186 break; 187 else if (!strcmp(bp->bio_attribute, "GEOM::kerneldump")) 188 g_disk_kerneldump(bp, dp); 189 else if (!strcmp(bp->bio_attribute, "GEOM::ioctl") && 190 bp->bio_length == sizeof *gio) { 191 g_call_me(g_disk_ioctl, bp); 192 return; 193 } else 194 error = ENOIOCTL; 195 break; 196 default: 197 error = EOPNOTSUPP; 198 break; 199 } 200 if (error) { 201 g_io_deliver(bp, error); 202 } 203 return; 204} 205 206dev_t 207disk_create(int unit, struct disk *dp, int flags, struct cdevsw *cdevsw, struct cdevsw *proto) 208{ 209 static int once; 210 struct g_geom *gp; 211 struct g_provider *pp; 212 dev_t dev; 213 214 mtx_unlock(&Giant); 215 if (!once) { 216 g_add_class(&g_disk_class); 217 once++; 218 } 219 dev = g_malloc(sizeof *dev, M_WAITOK | M_ZERO); 220 dp->d_dev = dev; 221 dp->d_devsw = cdevsw; 222 dev->si_devsw = cdevsw; 223 dev->si_disk = dp; 224 dev->si_udev = dkmakeminor(unit, WHOLE_DISK_SLICE, RAW_PART); 225 g_topology_lock(); 226 gp = g_new_geomf(&g_disk_class, "%s%d", cdevsw->d_name, unit); 227 strcpy(dev->si_name, gp->name); 228 gp->start = g_disk_start; 229 gp->access = g_disk_access; 230 gp->softc = dp; 231 dp->d_softc = gp; 232 pp = g_new_providerf(gp, "%s", gp->name); 233 g_error_provider(pp, 0); 234 g_topology_unlock(); 235 mtx_lock(&Giant); 236 return (dev); 237} 238 239void disk_dev_synth(dev_t dev); 240 241void 242disk_dev_synth(dev_t dev) 243{ 244 245 return; 246} 247 248void 249disk_destroy(dev_t dev) 250{ 251 struct disk *dp; 252 struct g_geom *gp; 253 254 dp = dev->si_disk; 255 gp = dp->d_softc; 256 g_free(dev); 257 gp->flags |= G_GEOM_WITHER; 258 g_orphan_provider(LIST_FIRST(&gp->provider), ENXIO); 259} 260 261void 262disk_invalidate (struct disk *disk) 263{ 264} 265 266SYSCTL_INT(_debug_sizeof, OID_AUTO, disklabel, CTLFLAG_RD, 267 0, sizeof(struct disklabel), "sizeof(struct disklabel)"); 268 269SYSCTL_INT(_debug_sizeof, OID_AUTO, diskslices, CTLFLAG_RD, 270 0, sizeof(struct diskslices), "sizeof(struct diskslices)"); 271 272SYSCTL_INT(_debug_sizeof, OID_AUTO, disk, CTLFLAG_RD, 273 0, sizeof(struct disk), "sizeof(struct disk)"); 274 275static void 276g_kern_disks(void *p) 277{ 278 struct sbuf *sb; 279 struct g_geom *gp; 280 char *sp; 281 282 sb = p; 283 sp = ""; 284 g_topology_assert(); 285 LIST_FOREACH(gp, &g_disk_class.geom, geom) { 286 sbuf_printf(sb, "%s%s", sp, gp->name); 287 sp = " "; 288 } 289 sbuf_finish(sb); 290 wakeup(sb); 291} 292 293static int 294sysctl_disks(SYSCTL_HANDLER_ARGS) 295{ 296 int error; 297 struct sbuf *sb; 298 299 sb = sbuf_new(NULL, NULL, 0, SBUF_AUTOEXTEND); 300 sbuf_clear(sb); 301 g_call_me(g_kern_disks, sb); 302 do { 303 tsleep(sb, PZERO, "kern.disks", hz); 304 } while(!sbuf_done(sb)); 305 error = SYSCTL_OUT(req, sbuf_data(sb), sbuf_len(sb)); 306 sbuf_delete(sb); 307 return error; 308} 309 310SYSCTL_PROC(_kern, OID_AUTO, disks, CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_NOLOCK, 0, 0, 311 sysctl_disks, "A", "names of available disks"); 312