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/11.2/sys/geom/geom_sunlabel.c 332640 2018-04-17 02:18:04Z kevans $");
   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 g_sunlabel_once = 0;
   69 
   70 static int
   71 g_sunlabel_modify(struct g_geom *gp, struct g_sunlabel_softc *ms, u_char *sec0)
   72 {
   73         int i, error;
   74         u_int u, v, csize;
   75         struct sun_disklabel sl;
   76         MD5_CTX md5sum;
   77 
   78         error = sunlabel_dec(sec0, &sl);
   79         if (error)
   80                 return (error);
   81 
   82         csize = sl.sl_ntracks * sl.sl_nsectors;
   83 
   84         for (i = 0; i < SUN_NPART; i++) {
   85                 v = sl.sl_part[i].sdkp_cyloffset;
   86                 u = sl.sl_part[i].sdkp_nsectors;
   87                 error = g_slice_config(gp, i, G_SLICE_CONFIG_CHECK,
   88                     ((off_t)v * csize) << 9ULL,
   89                     ((off_t)u) << 9ULL,
   90                     ms->sectorsize,
   91                     "%s%c", gp->name, 'a' + i);
   92                 if (error)
   93                         return (error);
   94         }
   95         for (i = 0; i < SUN_NPART; i++) {
   96                 v = sl.sl_part[i].sdkp_cyloffset;
   97                 u = sl.sl_part[i].sdkp_nsectors;
   98                 g_slice_config(gp, i, G_SLICE_CONFIG_SET,
   99                     ((off_t)v * csize) << 9ULL,
  100                     ((off_t)u) << 9ULL,
  101                     ms->sectorsize,
  102                     "%s%c", gp->name, 'a' + i);
  103         }
  104         ms->nalt = sl.sl_acylinders;
  105         ms->nheads = sl.sl_ntracks;
  106         ms->nsects = sl.sl_nsectors;
  107 
  108         /*
  109          * Calculate MD5 from the first sector and use it for avoiding
  110          * recursive labels creation.
  111          */
  112         MD5Init(&md5sum);
  113         MD5Update(&md5sum, sec0, ms->sectorsize);
  114         MD5Final(ms->labelsum, &md5sum);
  115 
  116         return (0);
  117 }
  118 
  119 static void
  120 g_sunlabel_hotwrite(void *arg, int flag)
  121 {
  122         struct bio *bp;
  123         struct g_geom *gp;
  124         struct g_slicer *gsp;
  125         struct g_slice *gsl;
  126         struct g_sunlabel_softc *ms;
  127         u_char *p;
  128         int error;
  129 
  130         KASSERT(flag != EV_CANCEL, ("g_sunlabel_hotwrite cancelled"));
  131         bp = arg;
  132         gp = bp->bio_to->geom;
  133         gsp = gp->softc;
  134         ms = gsp->softc;
  135         gsl = &gsp->slices[bp->bio_to->index];
  136         /*
  137          * XXX: For all practical purposes, this whould be equvivalent to
  138          * XXX: "p = (u_char *)bp->bio_data;" because the label is always
  139          * XXX: in the first sector and we refuse sectors smaller than the
  140          * XXX: label.
  141          */
  142         p = (u_char *)bp->bio_data - (bp->bio_offset + gsl->offset);
  143 
  144         error = g_sunlabel_modify(gp, ms, p);
  145         if (error) {
  146                 g_io_deliver(bp, EPERM);
  147                 return;
  148         }
  149         g_slice_finish_hot(bp);
  150 }
  151 
  152 static void
  153 g_sunlabel_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, struct g_consumer *cp __unused, struct g_provider *pp)
  154 {
  155         struct g_slicer *gsp;
  156         struct g_sunlabel_softc *ms;
  157 
  158         gsp = gp->softc;
  159         ms = gsp->softc;
  160         g_slice_dumpconf(sb, indent, gp, cp, pp);
  161         if (indent == NULL) {
  162                 sbuf_printf(sb, " sc %u hd %u alt %u",
  163                     ms->nsects, ms->nheads, ms->nalt);
  164         }
  165 }
  166 
  167 struct g_hh01 {
  168         struct g_geom *gp;
  169         struct g_sunlabel_softc *ms;
  170         u_char *label;
  171         int error;
  172 };
  173 
  174 static void
  175 g_sunlabel_callconfig(void *arg, int flag)
  176 {
  177         struct g_hh01 *hp;
  178 
  179         hp = arg;
  180         hp->error = g_sunlabel_modify(hp->gp, hp->ms, hp->label);
  181         if (!hp->error)
  182                 hp->error = g_write_data(LIST_FIRST(&hp->gp->consumer),
  183                     0, hp->label, SUN_SIZE);
  184 }
  185 
  186 /*
  187  * NB! curthread is user process which GCTL'ed.
  188  */
  189 static void
  190 g_sunlabel_config(struct gctl_req *req, struct g_class *mp, const char *verb)
  191 {
  192         u_char *label;
  193         int error, i;
  194         struct g_hh01 h0h0;
  195         struct g_slicer *gsp;
  196         struct g_geom *gp;
  197         struct g_consumer *cp;
  198 
  199         g_topology_assert();
  200         gp = gctl_get_geom(req, mp, "geom");
  201         if (gp == NULL)
  202                 return;
  203         cp = LIST_FIRST(&gp->consumer);
  204         gsp = gp->softc;
  205         if (!strcmp(verb, "write label")) {
  206                 label = gctl_get_paraml(req, "label", SUN_SIZE);
  207                 if (label == NULL)
  208                         return;
  209                 h0h0.gp = gp;
  210                 h0h0.ms = gsp->softc;
  211                 h0h0.label = label;
  212                 h0h0.error = -1;
  213                 /* XXX: Does this reference register with our selfdestruct code ? */
  214                 error = g_access(cp, 1, 1, 1);
  215                 if (error) {
  216                         gctl_error(req, "could not access consumer");
  217                         return;
  218                 }
  219                 g_sunlabel_callconfig(&h0h0, 0);
  220                 g_access(cp, -1, -1, -1);
  221         } else if (!strcmp(verb, "write bootcode")) {
  222                 label = gctl_get_paraml(req, "bootcode", SUN_BOOTSIZE);
  223                 if (label == NULL)
  224                         return;
  225                 /* XXX: Does this reference register with our selfdestruct code ? */
  226                 error = g_access(cp, 1, 1, 1);
  227                 if (error) {
  228                         gctl_error(req, "could not access consumer");
  229                         return;
  230                 }
  231                 for (i = 0; i < SUN_NPART; i++) {
  232                         if (gsp->slices[i].length <= SUN_BOOTSIZE)
  233                                 continue;
  234                         g_write_data(cp,
  235                             gsp->slices[i].offset + SUN_SIZE, label + SUN_SIZE,
  236                             SUN_BOOTSIZE - SUN_SIZE);
  237                 }
  238                 g_access(cp, -1, -1, -1);
  239         } else {
  240                 gctl_error(req, "Unknown verb parameter");
  241         }
  242 }
  243 
  244 static int
  245 g_sunlabel_start(struct bio *bp)
  246 {
  247         struct g_sunlabel_softc *mp;
  248         struct g_slicer *gsp;
  249 
  250         gsp = bp->bio_to->geom->softc;
  251         mp = gsp->softc;
  252         if (bp->bio_cmd == BIO_GETATTR) {
  253                 if (g_handleattr(bp, "SUN::labelsum", mp->labelsum,
  254                     sizeof(mp->labelsum)))
  255                         return (1);
  256         }
  257         return (0);
  258 }
  259 
  260 static struct g_geom *
  261 g_sunlabel_taste(struct g_class *mp, struct g_provider *pp, int flags)
  262 {
  263         struct g_geom *gp;
  264         struct g_consumer *cp;
  265         struct g_sunlabel_softc *ms;
  266         struct g_slicer *gsp;
  267         u_char *buf, hash[16];
  268         MD5_CTX md5sum;
  269         int error;
  270 
  271         g_trace(G_T_TOPOLOGY, "g_sunlabel_taste(%s,%s)", mp->name, pp->name);
  272         g_topology_assert();
  273         if (flags == G_TF_NORMAL &&
  274             !strcmp(pp->geom->class->name, SUNLABEL_CLASS_NAME))
  275                 return (NULL);
  276         gp = g_slice_new(mp, 8, pp, &cp, &ms, sizeof *ms, g_sunlabel_start);
  277         if (gp == NULL)
  278                 return (NULL);
  279         gsp = gp->softc;
  280         do {
  281                 ms->sectorsize = cp->provider->sectorsize;
  282                 if (ms->sectorsize < 512)
  283                         break;
  284                 g_topology_unlock();
  285                 buf = g_read_data(cp, 0, ms->sectorsize, NULL);
  286                 g_topology_lock();
  287                 if (buf == NULL)
  288                         break;
  289 
  290                 /*
  291                  * Calculate MD5 from the first sector and use it for avoiding
  292                  * recursive labels creation.
  293                  */
  294                 MD5Init(&md5sum);
  295                 MD5Update(&md5sum, buf, ms->sectorsize);
  296                 MD5Final(ms->labelsum, &md5sum);
  297  
  298                 error = g_getattr("SUN::labelsum", cp, &hash);
  299                 if (!error && !bcmp(ms->labelsum, hash, sizeof(hash))) {
  300                         g_free(buf);
  301                         break;
  302                 }
  303 
  304                 g_sunlabel_modify(gp, ms, buf);
  305                 g_free(buf);
  306 
  307                 break;
  308         } while (0);
  309         g_access(cp, -1, 0, 0);
  310         if (LIST_EMPTY(&gp->provider)) {
  311                 g_slice_spoiled(cp);
  312                 return (NULL);
  313         }
  314         g_slice_conf_hot(gp, 0, 0, SUN_SIZE,
  315             G_SLICE_HOT_ALLOW, G_SLICE_HOT_DENY, G_SLICE_HOT_CALL);
  316         gsp->hot = g_sunlabel_hotwrite;
  317         if (!g_sunlabel_once) {
  318                 g_sunlabel_once = 1;
  319                 printf(
  320                     "WARNING: geom_sunlabel (geom %s) is deprecated, "
  321                     "use gpart instead.\n", gp->name);
  322         }
  323         return (gp);
  324 }
  325 
  326 static struct g_class g_sunlabel_class = {
  327         .name = SUNLABEL_CLASS_NAME,
  328         .version = G_VERSION,
  329         .taste = g_sunlabel_taste,
  330         .ctlreq = g_sunlabel_config,
  331         .dumpconf = g_sunlabel_dumpconf,
  332 };
  333 
  334 DECLARE_GEOM_CLASS(g_sunlabel_class, g_sunlabel);
  335 MODULE_VERSION(geom_sunlabel, 0);

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