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 *
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35 * $FreeBSD: head/sys/geom/geom_slice.c 94287 2002-04-09 15:43:32Z phk $
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35 * $FreeBSD: head/sys/geom/geom_slice.c 95038 2002-04-19 09:24:12Z phk $ |
36 */ 37 38 39#include <sys/param.h> 40#ifndef _KERNEL 41#include <stdio.h> 42#include <unistd.h> 43#include <stdlib.h> 44#include <signal.h> 45#include <err.h> 46#else 47#include <sys/systm.h> 48#include <sys/kernel.h> 49#include <sys/malloc.h> 50#include <sys/bio.h> 51#include <sys/sysctl.h> 52#include <sys/proc.h> 53#include <sys/kthread.h> 54#include <sys/lock.h> 55#include <sys/mutex.h> 56#endif 57#include <sys/errno.h> 58#include <sys/sbuf.h> 59#include <geom/geom.h> 60#include <geom/geom_slice.h> 61#include <machine/stdarg.h> 62 63static g_orphan_t g_slice_orphan; 64static g_access_t g_slice_access; 65static g_start_t g_slice_start; 66 67struct g_slicer * 68g_slice_init(unsigned nslice, unsigned scsize) 69{ 70 struct g_slicer *gsp; 71 72 gsp = g_malloc(sizeof *gsp, M_WAITOK | M_ZERO); 73 gsp->softc = g_malloc(scsize, M_WAITOK | M_ZERO); 74 gsp->slices = g_malloc(nslice * sizeof(struct g_slice), M_WAITOK | M_ZERO); 75 gsp->nslice = nslice; 76 return (gsp); 77} 78 79static int 80g_slice_access(struct g_provider *pp, int dr, int dw, int de) 81{ 82 int error, i; 83 struct g_geom *gp; 84 struct g_consumer *cp; 85 struct g_provider *pp2; 86 struct g_slicer *gsp; 87 struct g_slice *gsl, *gsl2; 88 89 gp = pp->geom; 90 cp = LIST_FIRST(&gp->consumer); 91 KASSERT (cp != NULL, ("g_slice_access but no consumer")); 92 gsp = gp->softc; 93 gsl = &gsp->slices[pp->index]; 94 for (i = 0; i < gsp->nslice; i++) { 95 gsl2 = &gsp->slices[i]; 96 if (gsl2->length == 0) 97 continue; 98 if (i == pp->index) 99 continue; 100 if (gsl->offset + gsl->length <= gsl2->offset) 101 continue; 102 if (gsl2->offset + gsl2->length <= gsl->offset) 103 continue; 104 /* overlap */ 105 pp2 = gsl2->provider; 106 if ((pp->acw + dw) > 0 && pp2->ace > 0) 107 return (EPERM); 108 if ((pp->ace + de) > 0 && pp2->acw > 0) 109 return (EPERM); 110 } 111 /* On first open, grab an extra "exclusive" bit */ 112 if (cp->acr == 0 && cp->acw == 0 && cp->ace == 0) 113 de++; 114 /* ... and let go of it on last close */ 115 if ((cp->acr + dr) == 0 && (cp->acw + dw) == 0 && (cp->ace + de) == 1) 116 de--; 117 error = g_access_rel(cp, dr, dw, de); 118 pp->mediasize = gsp->slices[pp->index].length; 119 return (error); 120} 121 122static void 123g_slice_start(struct bio *bp) 124{ 125 struct bio *bp2; 126 struct g_provider *pp; 127 struct g_geom *gp; 128 struct g_consumer *cp; 129 struct g_slicer *gsp; 130 struct g_slice *gsl; 131 int index; 132 off_t t; 133 134 pp = bp->bio_to; 135 gp = pp->geom; 136 gsp = gp->softc; 137 cp = LIST_FIRST(&gp->consumer); 138 index = pp->index; 139 gsl = &gsp->slices[index]; 140 switch(bp->bio_cmd) { 141 case BIO_READ: 142 case BIO_WRITE: 143 case BIO_DELETE: 144 if (bp->bio_offset > gsl->length) { 145 bp->bio_error = EINVAL; /* XXX: EWHAT ? */ 146 g_io_deliver(bp); 147 return; 148 } 149 bp2 = g_clone_bio(bp); 150 if (bp2->bio_offset + bp2->bio_length > gsl->length) 151 bp2->bio_length = gsl->length - bp2->bio_offset; 152 bp2->bio_done = g_std_done; 153 bp2->bio_offset += gsl->offset; 154 g_io_request(bp2, cp); 155 return; 156 case BIO_GETATTR: 157 case BIO_SETATTR: 158 /* Give the real method a chance to override */ 159 if (gsp->start(bp)) 160 return; 161 if (g_haveattr_off_t(bp, "GEOM::mediasize", 162 gsp->slices[index].length)) 163 return; 164 if (!strcmp("GEOM::frontstuff", bp->bio_attribute)) { 165 t = gsp->cfrontstuff; 166 if (gsp->frontstuff > t) 167 t = gsp->frontstuff; 168 t -= gsl->offset; 169 if (t < 0) 170 t = 0; 171 if (t > gsl->length) 172 t = gsl->length; 173 g_haveattr_off_t(bp, "GEOM::frontstuff", t); 174 return; 175 }
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176 if (!strcmp("GEOM::kerneldump", bp->bio_attribute)) { 177 struct g_kerneldump *gkd; 178 179 gkd = (struct g_kerneldump *)bp->bio_data; 180 gkd->offset += gsp->slices[index].offset; 181 if (gkd->length > gsp->slices[index].length) 182 gkd->length = gsp->slices[index].length; 183 /* now, pass it on downwards... */ 184 } |
185 bp2 = g_clone_bio(bp); 186 bp2->bio_done = g_std_done; 187 g_io_request(bp2, cp); 188 break; 189 default: 190 bp->bio_error = EOPNOTSUPP; 191 g_io_deliver(bp); 192 return; 193 } 194} 195 196void 197g_slice_dumpconf(struct sbuf *sb, char *indent, struct g_geom *gp, struct g_consumer *cp __unused, struct g_provider *pp) 198{ 199 struct g_mbr_softc *mp; 200 struct g_slicer *gsp; 201 202 gsp = gp->softc; 203 mp = gsp->softc; 204 if (gp != NULL) { 205 sbuf_printf(sb, "%s<frontstuff>%llu</frontstuff>\n", 206 indent, (unsigned long long)gsp->frontstuff); 207 } 208 if (pp != NULL) { 209 sbuf_printf(sb, "%s<index>%u</index>\n", indent, pp->index); 210 sbuf_printf(sb, "%s<length>%llu</length>\n", 211 indent, (unsigned long long)gsp->slices[pp->index].length); 212 sbuf_printf(sb, "%s<seclength>%llu</seclength>\n", indent, 213 (unsigned long long)gsp->slices[pp->index].length / 512); 214 sbuf_printf(sb, "%s<offset>%llu</offset>\n", indent, 215 (unsigned long long)gsp->slices[pp->index].offset); 216 sbuf_printf(sb, "%s<secoffset>%llu</secoffset>\n", indent, 217 (unsigned long long)gsp->slices[pp->index].offset / 512); 218 } 219} 220 221struct g_provider * 222g_slice_addslice(struct g_geom *gp, int index, off_t offset, off_t length, char *fmt, ...) 223{ 224 struct g_provider *pp; 225 struct g_slicer *gsp; 226 va_list ap; 227 struct sbuf *sb; 228 229 g_trace(G_T_TOPOLOGY, "g_slice_addslice()"); 230 g_topology_lock(); 231 gsp = gp->softc; 232 va_start(ap, fmt); 233 sb = sbuf_new(NULL, NULL, 0, SBUF_AUTOEXTEND); 234 sbuf_vprintf(sb, fmt, ap); 235 sbuf_finish(sb); 236 pp = g_new_providerf(gp, sbuf_data(sb)); 237 238 pp->index = index; 239 gsp->slices[index].length = length; 240 gsp->slices[index].offset = offset; 241 gsp->slices[index].provider = pp; 242 sbuf_delete(sb); 243 g_topology_unlock(); 244 return(pp); 245} 246 247struct g_geom * 248g_slice_new(struct g_class *mp, int slices, struct g_provider *pp, struct g_consumer **cpp, void *extrap, int extra, g_slice_start_t *start) 249{ 250 struct g_geom *gp; 251 struct g_slicer *gsp; 252 struct g_consumer *cp; 253 void **vp; 254 int error, i; 255 256 g_topology_assert(); 257 vp = (void **)extrap; 258 gp = g_new_geomf(mp, "%s", pp->name); 259 gsp = g_slice_init(slices, extra); 260 gsp->start = start; 261 gp->access = g_slice_access; 262 gp->orphan = g_slice_orphan; 263 gp->softc = gsp; 264 gp->start = g_slice_start; 265 gp->spoiled = g_std_spoiled; 266 gp->dumpconf = g_slice_dumpconf; 267 cp = g_new_consumer(gp); 268 g_attach(cp, pp); 269 error = g_access_rel(cp, 1, 0, 0); 270 if (error) { 271 g_dettach(cp); 272 g_destroy_consumer(cp); 273 g_free(gsp->slices); 274 g_free(gp->softc); 275 g_destroy_geom(gp); 276 return (NULL); 277 } 278 /* Find out if there are any magic bytes on the consumer */ 279 i = sizeof gsp->cfrontstuff; 280 error = g_io_getattr("GEOM::frontstuff", cp, &i, &gsp->cfrontstuff); 281 if (error) 282 gsp->cfrontstuff = 0; 283 *vp = gsp->softc; 284 *cpp = cp; 285 return (gp); 286} 287 288static void 289g_slice_orphan(struct g_consumer *cp) 290{ 291 struct g_geom *gp; 292 struct g_provider *pp; 293 int error; 294 295 g_trace(G_T_TOPOLOGY, "g_slice_orphan(%p/%s)", cp, cp->provider->name); 296 g_topology_assert(); 297 KASSERT(cp->provider->error != 0, 298 ("g_slice_orphan with error == 0")); 299 300 gp = cp->geom; 301 gp->flags |= G_GEOM_WITHER; 302 /* First prevent any new requests */ 303 error = cp->provider->error; 304 LIST_FOREACH(pp, &gp->provider, provider) 305 g_orphan_provider(pp, error); 306 307 return; 308}
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