geom_slice.c revision 95321
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 95321 2002-04-23 19:03:03Z phk $ 3692108Sphk */ 3792108Sphk 3892108Sphk 3992108Sphk#include <sys/param.h> 4092108Sphk#ifndef _KERNEL 4192108Sphk#include <stdio.h> 4292108Sphk#include <unistd.h> 4392108Sphk#include <stdlib.h> 4492108Sphk#include <signal.h> 4592108Sphk#include <err.h> 4692108Sphk#else 4792108Sphk#include <sys/systm.h> 4892108Sphk#include <sys/kernel.h> 4992108Sphk#include <sys/malloc.h> 5092108Sphk#include <sys/bio.h> 5192108Sphk#include <sys/sysctl.h> 5292108Sphk#include <sys/proc.h> 5392108Sphk#include <sys/kthread.h> 5492108Sphk#include <sys/lock.h> 5592108Sphk#include <sys/mutex.h> 5692108Sphk#endif 5792108Sphk#include <sys/errno.h> 5892108Sphk#include <sys/sbuf.h> 5992108Sphk#include <geom/geom.h> 6092108Sphk#include <geom/geom_slice.h> 6192108Sphk#include <machine/stdarg.h> 6292108Sphk 6393776Sphkstatic g_orphan_t g_slice_orphan; 6493776Sphkstatic g_access_t g_slice_access; 6593776Sphkstatic g_start_t g_slice_start; 6693776Sphk 6795321Sphkstatic struct g_slicer * 6892108Sphkg_slice_init(unsigned nslice, unsigned scsize) 6992108Sphk{ 7092108Sphk struct g_slicer *gsp; 7192108Sphk 7292371Sphk gsp = g_malloc(sizeof *gsp, M_WAITOK | M_ZERO); 7392371Sphk gsp->softc = g_malloc(scsize, M_WAITOK | M_ZERO); 7492371Sphk gsp->slices = g_malloc(nslice * sizeof(struct g_slice), M_WAITOK | M_ZERO); 7592108Sphk gsp->nslice = nslice; 7692108Sphk return (gsp); 7792108Sphk} 7892108Sphk 7993776Sphkstatic int 8092108Sphkg_slice_access(struct g_provider *pp, int dr, int dw, int de) 8192108Sphk{ 8292108Sphk int error, i; 8392108Sphk struct g_geom *gp; 8492108Sphk struct g_consumer *cp; 8592108Sphk struct g_provider *pp2; 8692108Sphk struct g_slicer *gsp; 8792108Sphk struct g_slice *gsl, *gsl2; 8892108Sphk 8992108Sphk gp = pp->geom; 9092108Sphk cp = LIST_FIRST(&gp->consumer); 9192108Sphk KASSERT (cp != NULL, ("g_slice_access but no consumer")); 9292108Sphk gsp = gp->softc; 9392108Sphk gsl = &gsp->slices[pp->index]; 9492108Sphk for (i = 0; i < gsp->nslice; i++) { 9592108Sphk gsl2 = &gsp->slices[i]; 9692108Sphk if (gsl2->length == 0) 9792108Sphk continue; 9892108Sphk if (i == pp->index) 9992108Sphk continue; 10092108Sphk if (gsl->offset + gsl->length <= gsl2->offset) 10192108Sphk continue; 10292108Sphk if (gsl2->offset + gsl2->length <= gsl->offset) 10392108Sphk continue; 10492108Sphk /* overlap */ 10592108Sphk pp2 = gsl2->provider; 10692108Sphk if ((pp->acw + dw) > 0 && pp2->ace > 0) 10792108Sphk return (EPERM); 10892108Sphk if ((pp->ace + de) > 0 && pp2->acw > 0) 10992108Sphk return (EPERM); 11092108Sphk } 11192108Sphk /* On first open, grab an extra "exclusive" bit */ 11292108Sphk if (cp->acr == 0 && cp->acw == 0 && cp->ace == 0) 11392108Sphk de++; 11492108Sphk /* ... and let go of it on last close */ 11592108Sphk if ((cp->acr + dr) == 0 && (cp->acw + dw) == 0 && (cp->ace + de) == 1) 11692108Sphk de--; 11792108Sphk error = g_access_rel(cp, dr, dw, de); 11893778Sphk pp->mediasize = gsp->slices[pp->index].length; 11992108Sphk return (error); 12092108Sphk} 12192108Sphk 12293776Sphkstatic void 12392108Sphkg_slice_start(struct bio *bp) 12492108Sphk{ 12592108Sphk struct bio *bp2; 12692108Sphk struct g_provider *pp; 12792108Sphk struct g_geom *gp; 12892108Sphk struct g_consumer *cp; 12992108Sphk struct g_slicer *gsp; 13092108Sphk struct g_slice *gsl; 13192108Sphk int index; 13294287Sphk off_t t; 13392108Sphk 13492108Sphk pp = bp->bio_to; 13592108Sphk gp = pp->geom; 13692108Sphk gsp = gp->softc; 13792108Sphk cp = LIST_FIRST(&gp->consumer); 13892108Sphk index = pp->index; 13994287Sphk gsl = &gsp->slices[index]; 14092108Sphk switch(bp->bio_cmd) { 14192108Sphk case BIO_READ: 14292108Sphk case BIO_WRITE: 14392108Sphk case BIO_DELETE: 14492108Sphk if (bp->bio_offset > gsl->length) { 14592108Sphk bp->bio_error = EINVAL; /* XXX: EWHAT ? */ 14692108Sphk g_io_deliver(bp); 14792108Sphk return; 14892108Sphk } 14992108Sphk bp2 = g_clone_bio(bp); 15092108Sphk if (bp2->bio_offset + bp2->bio_length > gsl->length) 15192108Sphk bp2->bio_length = gsl->length - bp2->bio_offset; 15292108Sphk bp2->bio_done = g_std_done; 15392108Sphk bp2->bio_offset += gsl->offset; 15492108Sphk g_io_request(bp2, cp); 15592108Sphk return; 15692108Sphk case BIO_GETATTR: 15792108Sphk case BIO_SETATTR: 15894287Sphk /* Give the real method a chance to override */ 15994287Sphk if (gsp->start(bp)) 16094287Sphk return; 16192108Sphk if (g_haveattr_off_t(bp, "GEOM::mediasize", 16292108Sphk gsp->slices[index].length)) 16392108Sphk return; 16494287Sphk if (!strcmp("GEOM::frontstuff", bp->bio_attribute)) { 16594287Sphk t = gsp->cfrontstuff; 16694287Sphk if (gsp->frontstuff > t) 16794287Sphk t = gsp->frontstuff; 16894287Sphk t -= gsl->offset; 16994287Sphk if (t < 0) 17094287Sphk t = 0; 17194287Sphk if (t > gsl->length) 17294287Sphk t = gsl->length; 17394287Sphk g_haveattr_off_t(bp, "GEOM::frontstuff", t); 17492108Sphk return; 17594287Sphk } 17695310Sphk#ifdef _KERNEL 17795038Sphk if (!strcmp("GEOM::kerneldump", bp->bio_attribute)) { 17895038Sphk struct g_kerneldump *gkd; 17995038Sphk 18095038Sphk gkd = (struct g_kerneldump *)bp->bio_data; 18195038Sphk gkd->offset += gsp->slices[index].offset; 18295038Sphk if (gkd->length > gsp->slices[index].length) 18395038Sphk gkd->length = gsp->slices[index].length; 18495038Sphk /* now, pass it on downwards... */ 18595038Sphk } 18695310Sphk#endif 18792108Sphk bp2 = g_clone_bio(bp); 18892108Sphk bp2->bio_done = g_std_done; 18992108Sphk g_io_request(bp2, cp); 19092108Sphk break; 19192108Sphk default: 19292108Sphk bp->bio_error = EOPNOTSUPP; 19392108Sphk g_io_deliver(bp); 19492108Sphk return; 19592108Sphk } 19692108Sphk} 19792108Sphk 19892108Sphkvoid 19992108Sphkg_slice_dumpconf(struct sbuf *sb, char *indent, struct g_geom *gp, struct g_consumer *cp __unused, struct g_provider *pp) 20092108Sphk{ 20192108Sphk struct g_mbr_softc *mp; 20292108Sphk struct g_slicer *gsp; 20392108Sphk 20492108Sphk gsp = gp->softc; 20592108Sphk mp = gsp->softc; 20694287Sphk if (gp != NULL) { 20794287Sphk sbuf_printf(sb, "%s<frontstuff>%llu</frontstuff>\n", 20894287Sphk indent, (unsigned long long)gsp->frontstuff); 20994287Sphk } 21092108Sphk if (pp != NULL) { 21192108Sphk sbuf_printf(sb, "%s<index>%u</index>\n", indent, pp->index); 21292108Sphk sbuf_printf(sb, "%s<length>%llu</length>\n", 21393326Sphk indent, (unsigned long long)gsp->slices[pp->index].length); 21493326Sphk sbuf_printf(sb, "%s<seclength>%llu</seclength>\n", indent, 21593326Sphk (unsigned long long)gsp->slices[pp->index].length / 512); 21693326Sphk sbuf_printf(sb, "%s<offset>%llu</offset>\n", indent, 21793326Sphk (unsigned long long)gsp->slices[pp->index].offset); 21893326Sphk sbuf_printf(sb, "%s<secoffset>%llu</secoffset>\n", indent, 21993326Sphk (unsigned long long)gsp->slices[pp->index].offset / 512); 22092108Sphk } 22192108Sphk} 22292108Sphk 22392108Sphkstruct g_provider * 22492108Sphkg_slice_addslice(struct g_geom *gp, int index, off_t offset, off_t length, char *fmt, ...) 22592108Sphk{ 22692108Sphk struct g_provider *pp; 22792108Sphk struct g_slicer *gsp; 22892108Sphk va_list ap; 22992108Sphk struct sbuf *sb; 23092108Sphk 23192108Sphk g_trace(G_T_TOPOLOGY, "g_slice_addslice()"); 23292108Sphk g_topology_lock(); 23392108Sphk gsp = gp->softc; 23492108Sphk va_start(ap, fmt); 23592108Sphk sb = sbuf_new(NULL, NULL, 0, SBUF_AUTOEXTEND); 23692108Sphk sbuf_vprintf(sb, fmt, ap); 23792108Sphk sbuf_finish(sb); 23892108Sphk pp = g_new_providerf(gp, sbuf_data(sb)); 23992108Sphk 24092108Sphk pp->index = index; 24192108Sphk gsp->slices[index].length = length; 24292108Sphk gsp->slices[index].offset = offset; 24392108Sphk gsp->slices[index].provider = pp; 24492108Sphk sbuf_delete(sb); 24592108Sphk g_topology_unlock(); 24692108Sphk return(pp); 24792108Sphk} 24892108Sphk 24992108Sphkstruct g_geom * 25093248Sphkg_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) 25192108Sphk{ 25292108Sphk struct g_geom *gp; 25392108Sphk struct g_slicer *gsp; 25492108Sphk struct g_consumer *cp; 25592108Sphk void **vp; 25694287Sphk int error, i; 25792108Sphk 25892108Sphk g_topology_assert(); 25992108Sphk vp = (void **)extrap; 26092108Sphk gp = g_new_geomf(mp, "%s", pp->name); 26192108Sphk gsp = g_slice_init(slices, extra); 26292108Sphk gsp->start = start; 26393776Sphk gp->access = g_slice_access; 26493776Sphk gp->orphan = g_slice_orphan; 26592108Sphk gp->softc = gsp; 26692108Sphk gp->start = g_slice_start; 26792108Sphk gp->spoiled = g_std_spoiled; 26892108Sphk gp->dumpconf = g_slice_dumpconf; 26992108Sphk cp = g_new_consumer(gp); 27092108Sphk g_attach(cp, pp); 27192108Sphk error = g_access_rel(cp, 1, 0, 0); 27292108Sphk if (error) { 27392108Sphk g_dettach(cp); 27492108Sphk g_destroy_consumer(cp); 27592371Sphk g_free(gsp->slices); 27692108Sphk g_free(gp->softc); 27792108Sphk g_destroy_geom(gp); 27892108Sphk return (NULL); 27992108Sphk } 28094287Sphk /* Find out if there are any magic bytes on the consumer */ 28194287Sphk i = sizeof gsp->cfrontstuff; 28294287Sphk error = g_io_getattr("GEOM::frontstuff", cp, &i, &gsp->cfrontstuff); 28394287Sphk if (error) 28494287Sphk gsp->cfrontstuff = 0; 28592108Sphk *vp = gsp->softc; 28692108Sphk *cpp = cp; 28792108Sphk return (gp); 28892108Sphk} 28992108Sphk 29093776Sphkstatic void 29193250Sphkg_slice_orphan(struct g_consumer *cp) 29292108Sphk{ 29392108Sphk struct g_geom *gp; 29492108Sphk struct g_provider *pp; 29592108Sphk int error; 29692108Sphk 29792108Sphk g_trace(G_T_TOPOLOGY, "g_slice_orphan(%p/%s)", cp, cp->provider->name); 29892108Sphk g_topology_assert(); 29992108Sphk KASSERT(cp->provider->error != 0, 30092108Sphk ("g_slice_orphan with error == 0")); 30192108Sphk 30292108Sphk gp = cp->geom; 30392108Sphk gp->flags |= G_GEOM_WITHER; 30492108Sphk /* First prevent any new requests */ 30592108Sphk error = cp->provider->error; 30692108Sphk LIST_FOREACH(pp, &gp->provider, provider) 30792108Sphk g_orphan_provider(pp, error); 30892108Sphk 30992108Sphk return; 31092108Sphk} 311