geom_slice.c revision 105540
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_slice.c 105540 2002-10-20 18:48:12Z phk $ 3692108Sphk */ 3792108Sphk 3892108Sphk 3992108Sphk#include <sys/param.h> 40105540Sphk#include <sys/stdint.h> 4192108Sphk#ifndef _KERNEL 4292108Sphk#include <stdio.h> 4392108Sphk#include <unistd.h> 4492108Sphk#include <stdlib.h> 4592108Sphk#include <signal.h> 4696952Sphk#include <string.h> 4792108Sphk#include <err.h> 4892108Sphk#else 4992108Sphk#include <sys/systm.h> 5092108Sphk#include <sys/kernel.h> 5192108Sphk#include <sys/malloc.h> 5292108Sphk#include <sys/bio.h> 5392108Sphk#include <sys/sysctl.h> 5492108Sphk#include <sys/proc.h> 5592108Sphk#include <sys/kthread.h> 5692108Sphk#include <sys/lock.h> 5792108Sphk#include <sys/mutex.h> 5892108Sphk#endif 5992108Sphk#include <sys/errno.h> 6092108Sphk#include <sys/sbuf.h> 6192108Sphk#include <geom/geom.h> 6292108Sphk#include <geom/geom_slice.h> 6392108Sphk#include <machine/stdarg.h> 6492108Sphk 6593776Sphkstatic g_orphan_t g_slice_orphan; 6693776Sphkstatic g_access_t g_slice_access; 6793776Sphkstatic g_start_t g_slice_start; 6893776Sphk 6995321Sphkstatic struct g_slicer * 7092108Sphkg_slice_init(unsigned nslice, unsigned scsize) 7192108Sphk{ 7292108Sphk struct g_slicer *gsp; 7392108Sphk 7492371Sphk gsp = g_malloc(sizeof *gsp, M_WAITOK | M_ZERO); 7592371Sphk gsp->softc = g_malloc(scsize, M_WAITOK | M_ZERO); 76104057Sphk gsp->slices = g_malloc(nslice * sizeof(struct g_slice), 77104057Sphk M_WAITOK | M_ZERO); 7892108Sphk gsp->nslice = nslice; 7992108Sphk return (gsp); 8092108Sphk} 8192108Sphk 8293776Sphkstatic int 8392108Sphkg_slice_access(struct g_provider *pp, int dr, int dw, int de) 8492108Sphk{ 8592108Sphk int error, i; 8692108Sphk struct g_geom *gp; 8792108Sphk struct g_consumer *cp; 8892108Sphk struct g_provider *pp2; 8992108Sphk struct g_slicer *gsp; 9092108Sphk struct g_slice *gsl, *gsl2; 9192108Sphk 9292108Sphk gp = pp->geom; 9392108Sphk cp = LIST_FIRST(&gp->consumer); 9492108Sphk KASSERT (cp != NULL, ("g_slice_access but no consumer")); 9592108Sphk gsp = gp->softc; 9692108Sphk gsl = &gsp->slices[pp->index]; 9792108Sphk for (i = 0; i < gsp->nslice; i++) { 9892108Sphk gsl2 = &gsp->slices[i]; 9992108Sphk if (gsl2->length == 0) 10092108Sphk continue; 10192108Sphk if (i == pp->index) 10292108Sphk continue; 10392108Sphk if (gsl->offset + gsl->length <= gsl2->offset) 10492108Sphk continue; 10592108Sphk if (gsl2->offset + gsl2->length <= gsl->offset) 10692108Sphk continue; 10792108Sphk /* overlap */ 10892108Sphk pp2 = gsl2->provider; 10992108Sphk if ((pp->acw + dw) > 0 && pp2->ace > 0) 11092108Sphk return (EPERM); 11192108Sphk if ((pp->ace + de) > 0 && pp2->acw > 0) 11292108Sphk return (EPERM); 11392108Sphk } 11492108Sphk /* On first open, grab an extra "exclusive" bit */ 11592108Sphk if (cp->acr == 0 && cp->acw == 0 && cp->ace == 0) 11692108Sphk de++; 11792108Sphk /* ... and let go of it on last close */ 11892108Sphk if ((cp->acr + dr) == 0 && (cp->acw + dw) == 0 && (cp->ace + de) == 1) 11992108Sphk de--; 12092108Sphk error = g_access_rel(cp, dr, dw, de); 12193778Sphk pp->mediasize = gsp->slices[pp->index].length; 12292108Sphk return (error); 12392108Sphk} 12492108Sphk 12593776Sphkstatic void 12692108Sphkg_slice_start(struct bio *bp) 12792108Sphk{ 12892108Sphk struct bio *bp2; 12992108Sphk struct g_provider *pp; 13092108Sphk struct g_geom *gp; 13192108Sphk struct g_consumer *cp; 13292108Sphk struct g_slicer *gsp; 13392108Sphk struct g_slice *gsl; 13492108Sphk int index; 13594287Sphk off_t t; 13692108Sphk 13792108Sphk pp = bp->bio_to; 13892108Sphk gp = pp->geom; 13992108Sphk gsp = gp->softc; 14092108Sphk cp = LIST_FIRST(&gp->consumer); 14192108Sphk index = pp->index; 14294287Sphk gsl = &gsp->slices[index]; 14392108Sphk switch(bp->bio_cmd) { 14492108Sphk case BIO_READ: 14592108Sphk case BIO_WRITE: 14692108Sphk case BIO_DELETE: 14792108Sphk if (bp->bio_offset > gsl->length) { 148104195Sphk g_io_deliver(bp, EINVAL); /* XXX: EWHAT ? */ 14992108Sphk return; 15092108Sphk } 15192108Sphk bp2 = g_clone_bio(bp); 152104057Sphk if (bp2 == NULL) { 153104195Sphk g_io_deliver(bp, ENOMEM); 154104057Sphk return; 155104057Sphk } 15692108Sphk if (bp2->bio_offset + bp2->bio_length > gsl->length) 15792108Sphk bp2->bio_length = gsl->length - bp2->bio_offset; 15892108Sphk bp2->bio_done = g_std_done; 15992108Sphk bp2->bio_offset += gsl->offset; 16092108Sphk g_io_request(bp2, cp); 16192108Sphk return; 16292108Sphk case BIO_GETATTR: 16392108Sphk case BIO_SETATTR: 16494287Sphk /* Give the real method a chance to override */ 16594287Sphk if (gsp->start(bp)) 16694287Sphk return; 16798066Sphk if (g_handleattr_off_t(bp, "GEOM::mediasize", 16892108Sphk gsp->slices[index].length)) 16992108Sphk return; 17094287Sphk if (!strcmp("GEOM::frontstuff", bp->bio_attribute)) { 17194287Sphk t = gsp->cfrontstuff; 17294287Sphk if (gsp->frontstuff > t) 17394287Sphk t = gsp->frontstuff; 17494287Sphk t -= gsl->offset; 17594287Sphk if (t < 0) 17694287Sphk t = 0; 17794287Sphk if (t > gsl->length) 17894287Sphk t = gsl->length; 17998066Sphk g_handleattr_off_t(bp, "GEOM::frontstuff", t); 18092108Sphk return; 18194287Sphk } 18295310Sphk#ifdef _KERNEL 18395038Sphk if (!strcmp("GEOM::kerneldump", bp->bio_attribute)) { 18495038Sphk struct g_kerneldump *gkd; 18595038Sphk 18695038Sphk gkd = (struct g_kerneldump *)bp->bio_data; 18795038Sphk gkd->offset += gsp->slices[index].offset; 18895038Sphk if (gkd->length > gsp->slices[index].length) 18995038Sphk gkd->length = gsp->slices[index].length; 19095038Sphk /* now, pass it on downwards... */ 19195038Sphk } 19295310Sphk#endif 19392108Sphk bp2 = g_clone_bio(bp); 194104081Sphk if (bp2 == NULL) { 195104195Sphk g_io_deliver(bp, ENOMEM); 196104081Sphk return; 197104081Sphk } 19892108Sphk bp2->bio_done = g_std_done; 19992108Sphk g_io_request(bp2, cp); 20092108Sphk break; 20192108Sphk default: 202104195Sphk g_io_deliver(bp, EOPNOTSUPP); 20392108Sphk return; 20492108Sphk } 20592108Sphk} 20692108Sphk 20792108Sphkvoid 208104087Sphkg_slice_dumpconf(struct sbuf *sb, char *indent, struct g_geom *gp, struct g_consumer *cp, struct g_provider *pp) 20992108Sphk{ 21092108Sphk struct g_slicer *gsp; 21192108Sphk 21292108Sphk gsp = gp->softc; 21395323Sphk if (gp != NULL && (pp == NULL && cp == NULL)) { 214105540Sphk sbuf_printf(sb, "%s<frontstuff>%ju</frontstuff>\n", 215105540Sphk indent, (intmax_t)gsp->frontstuff); 21694287Sphk } 21792108Sphk if (pp != NULL) { 21892108Sphk sbuf_printf(sb, "%s<index>%u</index>\n", indent, pp->index); 219105540Sphk sbuf_printf(sb, "%s<length>%ju</length>\n", 220105540Sphk indent, (uintmax_t)gsp->slices[pp->index].length); 221105540Sphk sbuf_printf(sb, "%s<seclength>%ju</seclength>\n", indent, 222105540Sphk (uintmax_t)gsp->slices[pp->index].length / 512); 223105540Sphk sbuf_printf(sb, "%s<offset>%ju</offset>\n", indent, 224105540Sphk (uintmax_t)gsp->slices[pp->index].offset); 225105540Sphk sbuf_printf(sb, "%s<secoffset>%ju</secoffset>\n", indent, 226105540Sphk (uintmax_t)gsp->slices[pp->index].offset / 512); 22792108Sphk } 22892108Sphk} 22992108Sphk 230104064Sphkint 231104064Sphkg_slice_config(struct g_geom *gp, int index, int how, off_t offset, off_t length, char *fmt, ...) 232104064Sphk{ 233104064Sphk struct g_provider *pp; 234104064Sphk struct g_slicer *gsp; 235104064Sphk struct g_slice *gsl; 236104064Sphk va_list ap; 237104064Sphk struct sbuf *sb; 238104064Sphk int error, acc; 239104064Sphk 240104195Sphk g_trace(G_T_TOPOLOGY, "g_slice_config(%s, %d, %d)", 241104195Sphk gp->name, index, how); 242104064Sphk g_topology_assert(); 243104064Sphk gsp = gp->softc; 244104064Sphk error = 0; 245104064Sphk if (index >= gsp->nslice) 246104064Sphk return(EINVAL); 247104064Sphk gsl = &gsp->slices[index]; 248104064Sphk pp = gsl->provider; 249104064Sphk if (pp != NULL) 250104064Sphk acc = pp->acr + pp->acw + pp->ace; 251104064Sphk else 252104064Sphk acc = 0; 253104064Sphk if (acc != 0 && how != G_SLICE_CONFIG_FORCE) { 254104064Sphk if (length < gsl->length) 255104064Sphk return(EBUSY); 256104064Sphk if (offset != gsl->offset) 257104064Sphk return(EBUSY); 258104064Sphk } 259104064Sphk /* XXX: check offset + length <= MEDIASIZE */ 260104064Sphk if (how == G_SLICE_CONFIG_CHECK) 261104064Sphk return (0); 262104064Sphk gsl->length = length; 263104064Sphk gsl->offset = offset; 264104064Sphk if (length != 0 && pp != NULL) 265104064Sphk return (0); 266104064Sphk if (length == 0 && pp == NULL) 267104064Sphk return (0); 268104064Sphk if (length == 0 && pp != NULL) { 269104064Sphk g_orphan_provider(pp, ENXIO); 270104064Sphk gsl->provider = NULL; 271104064Sphk gsp->nprovider--; 272104064Sphk return (0); 273104064Sphk } 274104064Sphk va_start(ap, fmt); 275104064Sphk sb = sbuf_new(NULL, NULL, 0, SBUF_AUTOEXTEND); 276104064Sphk sbuf_vprintf(sb, fmt, ap); 277104064Sphk sbuf_finish(sb); 278104064Sphk pp = g_new_providerf(gp, sbuf_data(sb)); 279104064Sphk pp->index = index; 280104064Sphk gsl->provider = pp; 281104064Sphk gsp->nprovider++; 282104064Sphk g_error_provider(pp, 0); 283104064Sphk sbuf_delete(sb); 284104064Sphk return(0); 285104064Sphk} 286104064Sphk 28792108Sphkstruct g_provider * 28892108Sphkg_slice_addslice(struct g_geom *gp, int index, off_t offset, off_t length, char *fmt, ...) 28992108Sphk{ 29092108Sphk struct g_provider *pp; 29192108Sphk struct g_slicer *gsp; 29292108Sphk va_list ap; 29392108Sphk struct sbuf *sb; 29492108Sphk 29592108Sphk g_trace(G_T_TOPOLOGY, "g_slice_addslice()"); 296104064Sphk g_topology_assert(); 29792108Sphk gsp = gp->softc; 29892108Sphk va_start(ap, fmt); 29992108Sphk sb = sbuf_new(NULL, NULL, 0, SBUF_AUTOEXTEND); 30092108Sphk sbuf_vprintf(sb, fmt, ap); 30192108Sphk sbuf_finish(sb); 30292108Sphk pp = g_new_providerf(gp, sbuf_data(sb)); 30392108Sphk 30492108Sphk pp->index = index; 30592108Sphk gsp->slices[index].length = length; 30692108Sphk gsp->slices[index].offset = offset; 30792108Sphk gsp->slices[index].provider = pp; 30892108Sphk sbuf_delete(sb); 30992108Sphk return(pp); 31092108Sphk} 31192108Sphk 31292108Sphkstruct g_geom * 31393248Sphkg_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) 31492108Sphk{ 31592108Sphk struct g_geom *gp; 31692108Sphk struct g_slicer *gsp; 31792108Sphk struct g_consumer *cp; 31892108Sphk void **vp; 31994287Sphk int error, i; 32092108Sphk 32192108Sphk g_topology_assert(); 32292108Sphk vp = (void **)extrap; 32392108Sphk gp = g_new_geomf(mp, "%s", pp->name); 32492108Sphk gsp = g_slice_init(slices, extra); 32592108Sphk gsp->start = start; 32693776Sphk gp->access = g_slice_access; 32793776Sphk gp->orphan = g_slice_orphan; 32892108Sphk gp->softc = gsp; 32992108Sphk gp->start = g_slice_start; 33092108Sphk gp->spoiled = g_std_spoiled; 33192108Sphk gp->dumpconf = g_slice_dumpconf; 33292108Sphk cp = g_new_consumer(gp); 33392108Sphk g_attach(cp, pp); 33492108Sphk error = g_access_rel(cp, 1, 0, 0); 33592108Sphk if (error) { 33698066Sphk g_detach(cp); 33792108Sphk g_destroy_consumer(cp); 33892371Sphk g_free(gsp->slices); 33992108Sphk g_free(gp->softc); 34092108Sphk g_destroy_geom(gp); 34192108Sphk return (NULL); 34292108Sphk } 34394287Sphk /* Find out if there are any magic bytes on the consumer */ 34494287Sphk i = sizeof gsp->cfrontstuff; 34594287Sphk error = g_io_getattr("GEOM::frontstuff", cp, &i, &gsp->cfrontstuff); 34694287Sphk if (error) 34794287Sphk gsp->cfrontstuff = 0; 34892108Sphk *vp = gsp->softc; 34992108Sphk *cpp = cp; 35092108Sphk return (gp); 35192108Sphk} 35292108Sphk 35393776Sphkstatic void 35493250Sphkg_slice_orphan(struct g_consumer *cp) 35592108Sphk{ 35692108Sphk struct g_geom *gp; 35792108Sphk struct g_provider *pp; 35892108Sphk int error; 35992108Sphk 36092108Sphk g_trace(G_T_TOPOLOGY, "g_slice_orphan(%p/%s)", cp, cp->provider->name); 36192108Sphk g_topology_assert(); 36292108Sphk KASSERT(cp->provider->error != 0, 36392108Sphk ("g_slice_orphan with error == 0")); 36492108Sphk 36592108Sphk gp = cp->geom; 36692108Sphk gp->flags |= G_GEOM_WITHER; 36792108Sphk error = cp->provider->error; 36892108Sphk LIST_FOREACH(pp, &gp->provider, provider) 36992108Sphk g_orphan_provider(pp, error); 37092108Sphk return; 37192108Sphk} 372