The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/geom/geom_sunlabel.c

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    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 
   36 #include <sys/cdefs.h>
   37 __FBSDID("$FreeBSD: releng/10.0/sys/geom/geom_sunlabel.c 223921 2011-07-11 05:22:31Z ae $");
   38 
   39 #include <sys/param.h>
   40 #include <sys/endian.h>
   41 #include <sys/systm.h>
   42 #include <sys/sysctl.h>
   43 #include <sys/kernel.h>
   44 #include <sys/conf.h>
   45 #include <sys/bio.h>
   46 #include <sys/malloc.h>
   47 #include <sys/lock.h>
   48 #include <sys/mutex.h>
   49 #include <sys/md5.h>
   50 #include <sys/sbuf.h>
   51 #include <sys/sun_disklabel.h>
   52 #include <geom/geom.h>
   53 #include <geom/geom_slice.h>
   54 #include <machine/endian.h>
   55 
   56 FEATURE(geom_sunlabel, "GEOM Sun/Solaris partitioning support");
   57 
   58 #define SUNLABEL_CLASS_NAME "SUN"
   59 
   60 struct g_sunlabel_softc {
   61         int sectorsize;
   62         int nheads;
   63         int nsects;
   64         int nalt;
   65         u_char labelsum[16];
   66 };
   67 
   68 static int
   69 g_sunlabel_modify(struct g_geom *gp, struct g_sunlabel_softc *ms, u_char *sec0)
   70 {
   71         int i, error;
   72         u_int u, v, csize;
   73         struct sun_disklabel sl;
   74         MD5_CTX md5sum;
   75 
   76         error = sunlabel_dec(sec0, &sl);
   77         if (error)
   78                 return (error);
   79 
   80         csize = sl.sl_ntracks * sl.sl_nsectors;
   81 
   82         for (i = 0; i < SUN_NPART; i++) {
   83                 v = sl.sl_part[i].sdkp_cyloffset;
   84                 u = sl.sl_part[i].sdkp_nsectors;
   85                 error = g_slice_config(gp, i, G_SLICE_CONFIG_CHECK,
   86                     ((off_t)v * csize) << 9ULL,
   87                     ((off_t)u) << 9ULL,
   88                     ms->sectorsize,
   89                     "%s%c", gp->name, 'a' + i);
   90                 if (error)
   91                         return (error);
   92         }
   93         for (i = 0; i < SUN_NPART; i++) {
   94                 v = sl.sl_part[i].sdkp_cyloffset;
   95                 u = sl.sl_part[i].sdkp_nsectors;
   96                 g_slice_config(gp, i, G_SLICE_CONFIG_SET,
   97                     ((off_t)v * csize) << 9ULL,
   98                     ((off_t)u) << 9ULL,
   99                     ms->sectorsize,
  100                     "%s%c", gp->name, 'a' + i);
  101         }
  102         ms->nalt = sl.sl_acylinders;
  103         ms->nheads = sl.sl_ntracks;
  104         ms->nsects = sl.sl_nsectors;
  105 
  106         /*
  107          * Calculate MD5 from the first sector and use it for avoiding
  108          * recursive labels creation.
  109          */
  110         MD5Init(&md5sum);
  111         MD5Update(&md5sum, sec0, ms->sectorsize);
  112         MD5Final(ms->labelsum, &md5sum);
  113 
  114         return (0);
  115 }
  116 
  117 static void
  118 g_sunlabel_hotwrite(void *arg, int flag)
  119 {
  120         struct bio *bp;
  121         struct g_geom *gp;
  122         struct g_slicer *gsp;
  123         struct g_slice *gsl;
  124         struct g_sunlabel_softc *ms;
  125         u_char *p;
  126         int error;
  127 
  128         KASSERT(flag != EV_CANCEL, ("g_sunlabel_hotwrite cancelled"));
  129         bp = arg;
  130         gp = bp->bio_to->geom;
  131         gsp = gp->softc;
  132         ms = gsp->softc;
  133         gsl = &gsp->slices[bp->bio_to->index];
  134         /*
  135          * XXX: For all practical purposes, this whould be equvivalent to
  136          * XXX: "p = (u_char *)bp->bio_data;" because the label is always
  137          * XXX: in the first sector and we refuse sectors smaller than the
  138          * XXX: label.
  139          */
  140         p = (u_char *)bp->bio_data - (bp->bio_offset + gsl->offset);
  141 
  142         error = g_sunlabel_modify(gp, ms, p);
  143         if (error) {
  144                 g_io_deliver(bp, EPERM);
  145                 return;
  146         }
  147         g_slice_finish_hot(bp);
  148 }
  149 
  150 static void
  151 g_sunlabel_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, struct g_consumer *cp __unused, struct g_provider *pp)
  152 {
  153         struct g_slicer *gsp;
  154         struct g_sunlabel_softc *ms;
  155 
  156         gsp = gp->softc;
  157         ms = gsp->softc;
  158         g_slice_dumpconf(sb, indent, gp, cp, pp);
  159         if (indent == NULL) {
  160                 sbuf_printf(sb, " sc %u hd %u alt %u",
  161                     ms->nsects, ms->nheads, ms->nalt);
  162         }
  163 }
  164 
  165 struct g_hh01 {
  166         struct g_geom *gp;
  167         struct g_sunlabel_softc *ms;
  168         u_char *label;
  169         int error;
  170 };
  171 
  172 static void
  173 g_sunlabel_callconfig(void *arg, int flag)
  174 {
  175         struct g_hh01 *hp;
  176 
  177         hp = arg;
  178         hp->error = g_sunlabel_modify(hp->gp, hp->ms, hp->label);
  179         if (!hp->error)
  180                 hp->error = g_write_data(LIST_FIRST(&hp->gp->consumer),
  181                     0, hp->label, SUN_SIZE);
  182 }
  183 
  184 /*
  185  * NB! curthread is user process which GCTL'ed.
  186  */
  187 static void
  188 g_sunlabel_config(struct gctl_req *req, struct g_class *mp, const char *verb)
  189 {
  190         u_char *label;
  191         int error, i;
  192         struct g_hh01 h0h0;
  193         struct g_slicer *gsp;
  194         struct g_geom *gp;
  195         struct g_consumer *cp;
  196 
  197         g_topology_assert();
  198         gp = gctl_get_geom(req, mp, "geom");
  199         if (gp == NULL)
  200                 return;
  201         cp = LIST_FIRST(&gp->consumer);
  202         gsp = gp->softc;
  203         if (!strcmp(verb, "write label")) {
  204                 label = gctl_get_paraml(req, "label", SUN_SIZE);
  205                 if (label == NULL)
  206                         return;
  207                 h0h0.gp = gp;
  208                 h0h0.ms = gsp->softc;
  209                 h0h0.label = label;
  210                 h0h0.error = -1;
  211                 /* XXX: Does this reference register with our selfdestruct code ? */
  212                 error = g_access(cp, 1, 1, 1);
  213                 if (error) {
  214                         gctl_error(req, "could not access consumer");
  215                         return;
  216                 }
  217                 g_sunlabel_callconfig(&h0h0, 0);
  218                 g_access(cp, -1, -1, -1);
  219         } else if (!strcmp(verb, "write bootcode")) {
  220                 label = gctl_get_paraml(req, "bootcode", SUN_BOOTSIZE);
  221                 if (label == NULL)
  222                         return;
  223                 /* XXX: Does this reference register with our selfdestruct code ? */
  224                 error = g_access(cp, 1, 1, 1);
  225                 if (error) {
  226                         gctl_error(req, "could not access consumer");
  227                         return;
  228                 }
  229                 for (i = 0; i < SUN_NPART; i++) {
  230                         if (gsp->slices[i].length <= SUN_BOOTSIZE)
  231                                 continue;
  232                         g_write_data(cp,
  233                             gsp->slices[i].offset + SUN_SIZE, label + SUN_SIZE,
  234                             SUN_BOOTSIZE - SUN_SIZE);
  235                 }
  236                 g_access(cp, -1, -1, -1);
  237         } else {
  238                 gctl_error(req, "Unknown verb parameter");
  239         }
  240 }
  241 
  242 static int
  243 g_sunlabel_start(struct bio *bp)
  244 {
  245         struct g_sunlabel_softc *mp;
  246         struct g_slicer *gsp;
  247 
  248         gsp = bp->bio_to->geom->softc;
  249         mp = gsp->softc;
  250         if (bp->bio_cmd == BIO_GETATTR) {
  251                 if (g_handleattr(bp, "SUN::labelsum", mp->labelsum,
  252                     sizeof(mp->labelsum)))
  253                         return (1);
  254         }
  255         return (0);
  256 }
  257 
  258 static struct g_geom *
  259 g_sunlabel_taste(struct g_class *mp, struct g_provider *pp, int flags)
  260 {
  261         struct g_geom *gp;
  262         struct g_consumer *cp;
  263         struct g_sunlabel_softc *ms;
  264         struct g_slicer *gsp;
  265         u_char *buf, hash[16];
  266         MD5_CTX md5sum;
  267         int error;
  268 
  269         g_trace(G_T_TOPOLOGY, "g_sunlabel_taste(%s,%s)", mp->name, pp->name);
  270         g_topology_assert();
  271         if (flags == G_TF_NORMAL &&
  272             !strcmp(pp->geom->class->name, SUNLABEL_CLASS_NAME))
  273                 return (NULL);
  274         gp = g_slice_new(mp, 8, pp, &cp, &ms, sizeof *ms, g_sunlabel_start);
  275         if (gp == NULL)
  276                 return (NULL);
  277         gsp = gp->softc;
  278         do {
  279                 ms->sectorsize = cp->provider->sectorsize;
  280                 if (ms->sectorsize < 512)
  281                         break;
  282                 g_topology_unlock();
  283                 buf = g_read_data(cp, 0, ms->sectorsize, NULL);
  284                 g_topology_lock();
  285                 if (buf == NULL)
  286                         break;
  287 
  288                 /*
  289                  * Calculate MD5 from the first sector and use it for avoiding
  290                  * recursive labels creation.
  291                  */
  292                 MD5Init(&md5sum);
  293                 MD5Update(&md5sum, buf, ms->sectorsize);
  294                 MD5Final(ms->labelsum, &md5sum);
  295  
  296                 error = g_getattr("SUN::labelsum", cp, &hash);
  297                 if (!error && !bcmp(ms->labelsum, hash, sizeof(hash))) {
  298                         g_free(buf);
  299                         break;
  300                 }
  301 
  302                 g_sunlabel_modify(gp, ms, buf);
  303                 g_free(buf);
  304 
  305                 break;
  306         } while (0);
  307         g_access(cp, -1, 0, 0);
  308         if (LIST_EMPTY(&gp->provider)) {
  309                 g_slice_spoiled(cp);
  310                 return (NULL);
  311         }
  312         g_slice_conf_hot(gp, 0, 0, SUN_SIZE,
  313             G_SLICE_HOT_ALLOW, G_SLICE_HOT_DENY, G_SLICE_HOT_CALL);
  314         gsp->hot = g_sunlabel_hotwrite;
  315         return (gp);
  316 }
  317 
  318 static struct g_class g_sunlabel_class = {
  319         .name = SUNLABEL_CLASS_NAME,
  320         .version = G_VERSION,
  321         .taste = g_sunlabel_taste,
  322         .ctlreq = g_sunlabel_config,
  323         .dumpconf = g_sunlabel_dumpconf,
  324 };
  325 
  326 DECLARE_GEOM_CLASS(g_sunlabel_class, g_sunlabel);

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