The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/geom/part/g_part_apm.c

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    1 /*-
    2  * Copyright (c) 2006-2008 Marcel Moolenaar
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  *
    9  * 1. Redistributions of source code must retain the above copyright
   10  *    notice, this list of conditions and the following disclaimer.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  *
   15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   18  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   25  */
   26 
   27 #include <sys/cdefs.h>
   28 __FBSDID("$FreeBSD: releng/8.0/sys/geom/part/g_part_apm.c 190461 2009-03-27 05:35:12Z marcel $");
   29 
   30 #include <sys/param.h>
   31 #include <sys/apm.h>
   32 #include <sys/bio.h>
   33 #include <sys/diskmbr.h>
   34 #include <sys/endian.h>
   35 #include <sys/kernel.h>
   36 #include <sys/kobj.h>
   37 #include <sys/limits.h>
   38 #include <sys/lock.h>
   39 #include <sys/malloc.h>
   40 #include <sys/mutex.h>
   41 #include <sys/queue.h>
   42 #include <sys/sbuf.h>
   43 #include <sys/systm.h>
   44 #include <geom/geom.h>
   45 #include <geom/part/g_part.h>
   46 
   47 #include "g_part_if.h"
   48 
   49 struct g_part_apm_table {
   50         struct g_part_table     base;
   51         struct apm_ddr          ddr;
   52         struct apm_ent          self;
   53         int                     tivo_series1;
   54 };
   55 
   56 struct g_part_apm_entry {
   57         struct g_part_entry     base;
   58         struct apm_ent          ent;
   59 };
   60 
   61 static int g_part_apm_add(struct g_part_table *, struct g_part_entry *,
   62     struct g_part_parms *);
   63 static int g_part_apm_create(struct g_part_table *, struct g_part_parms *);
   64 static int g_part_apm_destroy(struct g_part_table *, struct g_part_parms *);
   65 static void g_part_apm_dumpconf(struct g_part_table *, struct g_part_entry *,
   66     struct sbuf *, const char *);
   67 static int g_part_apm_dumpto(struct g_part_table *, struct g_part_entry *);
   68 static int g_part_apm_modify(struct g_part_table *, struct g_part_entry *,
   69     struct g_part_parms *);
   70 static const char *g_part_apm_name(struct g_part_table *, struct g_part_entry *,
   71     char *, size_t);
   72 static int g_part_apm_probe(struct g_part_table *, struct g_consumer *);
   73 static int g_part_apm_read(struct g_part_table *, struct g_consumer *);
   74 static const char *g_part_apm_type(struct g_part_table *, struct g_part_entry *,
   75     char *, size_t);
   76 static int g_part_apm_write(struct g_part_table *, struct g_consumer *);
   77 
   78 static kobj_method_t g_part_apm_methods[] = {
   79         KOBJMETHOD(g_part_add,          g_part_apm_add),
   80         KOBJMETHOD(g_part_create,       g_part_apm_create),
   81         KOBJMETHOD(g_part_destroy,      g_part_apm_destroy),
   82         KOBJMETHOD(g_part_dumpconf,     g_part_apm_dumpconf),
   83         KOBJMETHOD(g_part_dumpto,       g_part_apm_dumpto),
   84         KOBJMETHOD(g_part_modify,       g_part_apm_modify),
   85         KOBJMETHOD(g_part_name,         g_part_apm_name),
   86         KOBJMETHOD(g_part_probe,        g_part_apm_probe),
   87         KOBJMETHOD(g_part_read,         g_part_apm_read),
   88         KOBJMETHOD(g_part_type,         g_part_apm_type),
   89         KOBJMETHOD(g_part_write,        g_part_apm_write),
   90         { 0, 0 }
   91 };
   92 
   93 static struct g_part_scheme g_part_apm_scheme = {
   94         "APM",
   95         g_part_apm_methods,
   96         sizeof(struct g_part_apm_table),
   97         .gps_entrysz = sizeof(struct g_part_apm_entry),
   98         .gps_minent = 16,
   99         .gps_maxent = INT_MAX,
  100 };
  101 G_PART_SCHEME_DECLARE(g_part_apm);
  102 
  103 static void
  104 swab(char *buf, size_t bufsz)
  105 {
  106         int i;
  107         char ch;
  108 
  109         for (i = 0; i < bufsz; i += 2) {
  110                 ch = buf[i];
  111                 buf[i] = buf[i + 1];
  112                 buf[i + 1] = ch;
  113         }
  114 }
  115 
  116 static int
  117 apm_parse_type(const char *type, char *buf, size_t bufsz)
  118 {
  119         const char *alias;
  120 
  121         if (type[0] == '!') {
  122                 type++;
  123                 if (strlen(type) > bufsz)
  124                         return (EINVAL);
  125                 if (!strcmp(type, APM_ENT_TYPE_SELF) ||
  126                     !strcmp(type, APM_ENT_TYPE_UNUSED))
  127                         return (EINVAL);
  128                 strncpy(buf, type, bufsz);
  129                 return (0);
  130         }
  131         alias = g_part_alias_name(G_PART_ALIAS_FREEBSD);
  132         if (!strcasecmp(type, alias)) {
  133                 strcpy(buf, APM_ENT_TYPE_FREEBSD);
  134                 return (0);
  135         }
  136         alias = g_part_alias_name(G_PART_ALIAS_FREEBSD_SWAP);
  137         if (!strcasecmp(type, alias)) {
  138                 strcpy(buf, APM_ENT_TYPE_FREEBSD_SWAP);
  139                 return (0);
  140         }
  141         alias = g_part_alias_name(G_PART_ALIAS_FREEBSD_UFS);
  142         if (!strcasecmp(type, alias)) {
  143                 strcpy(buf, APM_ENT_TYPE_FREEBSD_UFS);
  144                 return (0);
  145         }
  146         alias = g_part_alias_name(G_PART_ALIAS_FREEBSD_VINUM);
  147         if (!strcasecmp(type, alias)) {
  148                 strcpy(buf, APM_ENT_TYPE_FREEBSD_VINUM);
  149                 return (0);
  150         }
  151         alias = g_part_alias_name(G_PART_ALIAS_FREEBSD_ZFS);
  152         if (!strcasecmp(type, alias)) {
  153                 strcpy(buf, APM_ENT_TYPE_FREEBSD_ZFS);
  154                 return (0);
  155         }
  156         return (EINVAL);
  157 }
  158 
  159 static int
  160 apm_read_ent(struct g_consumer *cp, uint32_t blk, struct apm_ent *ent,
  161     int tivo_series1)
  162 {
  163         struct g_provider *pp;
  164         char *buf;
  165         int error;
  166 
  167         pp = cp->provider;
  168         buf = g_read_data(cp, pp->sectorsize * blk, pp->sectorsize, &error);
  169         if (buf == NULL)
  170                 return (error);
  171         if (tivo_series1)
  172                 swab(buf, pp->sectorsize);
  173         ent->ent_sig = be16dec(buf);
  174         ent->ent_pmblkcnt = be32dec(buf + 4);
  175         ent->ent_start = be32dec(buf + 8);
  176         ent->ent_size = be32dec(buf + 12);
  177         bcopy(buf + 16, ent->ent_name, sizeof(ent->ent_name));
  178         bcopy(buf + 48, ent->ent_type, sizeof(ent->ent_type));
  179         g_free(buf);
  180         return (0);
  181 }
  182 
  183 static int
  184 g_part_apm_add(struct g_part_table *basetable, struct g_part_entry *baseentry, 
  185     struct g_part_parms *gpp)
  186 {
  187         struct g_part_apm_entry *entry;
  188         struct g_part_apm_table *table;
  189         int error;
  190 
  191         entry = (struct g_part_apm_entry *)baseentry;
  192         table = (struct g_part_apm_table *)basetable;
  193         entry->ent.ent_sig = APM_ENT_SIG;
  194         entry->ent.ent_pmblkcnt = table->self.ent_pmblkcnt;
  195         entry->ent.ent_start = gpp->gpp_start;
  196         entry->ent.ent_size = gpp->gpp_size;
  197         if (baseentry->gpe_deleted) {
  198                 bzero(entry->ent.ent_type, sizeof(entry->ent.ent_type));
  199                 bzero(entry->ent.ent_name, sizeof(entry->ent.ent_name));
  200         }
  201         error = apm_parse_type(gpp->gpp_type, entry->ent.ent_type,
  202             sizeof(entry->ent.ent_type));
  203         if (error)
  204                 return (error);
  205         if (gpp->gpp_parms & G_PART_PARM_LABEL) {
  206                 if (strlen(gpp->gpp_label) > sizeof(entry->ent.ent_name))
  207                         return (EINVAL);
  208                 strncpy(entry->ent.ent_name, gpp->gpp_label,
  209                     sizeof(entry->ent.ent_name));
  210         }
  211         return (0);
  212 }
  213 
  214 static int
  215 g_part_apm_create(struct g_part_table *basetable, struct g_part_parms *gpp)
  216 {
  217         struct g_provider *pp;
  218         struct g_part_apm_table *table;
  219         uint32_t last;
  220 
  221         /* We don't nest, which means that our depth should be 0. */
  222         if (basetable->gpt_depth != 0)
  223                 return (ENXIO);
  224 
  225         table = (struct g_part_apm_table *)basetable;
  226         pp = gpp->gpp_provider;
  227         if (pp->sectorsize != 512 ||
  228             pp->mediasize < (2 + 2 * basetable->gpt_entries) * pp->sectorsize)
  229                 return (ENOSPC);
  230 
  231         /* APM uses 32-bit LBAs. */
  232         last = MIN(pp->mediasize / pp->sectorsize, 0xffffffff) - 1;
  233 
  234         basetable->gpt_first = 2 + basetable->gpt_entries;
  235         basetable->gpt_last = last;
  236 
  237         table->ddr.ddr_sig = APM_DDR_SIG;
  238         table->ddr.ddr_blksize = pp->sectorsize;
  239         table->ddr.ddr_blkcount = last + 1;
  240 
  241         table->self.ent_sig = APM_ENT_SIG;
  242         table->self.ent_pmblkcnt = basetable->gpt_entries + 1;
  243         table->self.ent_start = 1;
  244         table->self.ent_size = table->self.ent_pmblkcnt;
  245         strcpy(table->self.ent_name, "Apple");
  246         strcpy(table->self.ent_type, APM_ENT_TYPE_SELF);
  247         return (0);
  248 }
  249 
  250 static int
  251 g_part_apm_destroy(struct g_part_table *basetable, struct g_part_parms *gpp)
  252 {
  253 
  254         /* Wipe the first 2 sectors to clear the partitioning. */
  255         basetable->gpt_smhead |= 3;
  256         return (0);
  257 }
  258 
  259 static void
  260 g_part_apm_dumpconf(struct g_part_table *table, struct g_part_entry *baseentry,
  261     struct sbuf *sb, const char *indent)
  262 {
  263         union {
  264                 char name[APM_ENT_NAMELEN + 1];
  265                 char type[APM_ENT_TYPELEN + 1];
  266         } u;
  267         struct g_part_apm_entry *entry;
  268 
  269         entry = (struct g_part_apm_entry *)baseentry;
  270         if (indent == NULL) {
  271                 /* conftxt: libdisk compatibility */
  272                 sbuf_printf(sb, " xs APPLE xt %s", entry->ent.ent_type);
  273         } else if (entry != NULL) {
  274                 /* confxml: partition entry information */
  275                 strncpy(u.name, entry->ent.ent_name, APM_ENT_NAMELEN);
  276                 u.name[APM_ENT_NAMELEN] = '\0';
  277                 sbuf_printf(sb, "%s<label>%s</label>\n", indent, u.name);
  278                 strncpy(u.type, entry->ent.ent_type, APM_ENT_TYPELEN);
  279                 u.type[APM_ENT_TYPELEN] = '\0';
  280                 sbuf_printf(sb, "%s<rawtype>%s</rawtype>\n", indent, u.type);
  281         } else {
  282                 /* confxml: scheme information */
  283         }
  284 }
  285 
  286 static int
  287 g_part_apm_dumpto(struct g_part_table *table, struct g_part_entry *baseentry)
  288 {
  289         struct g_part_apm_entry *entry;
  290 
  291         entry = (struct g_part_apm_entry *)baseentry;
  292         return ((!strcmp(entry->ent.ent_type, APM_ENT_TYPE_FREEBSD_SWAP))
  293             ? 1 : 0);
  294 }
  295 
  296 static int
  297 g_part_apm_modify(struct g_part_table *basetable,
  298     struct g_part_entry *baseentry, struct g_part_parms *gpp)
  299 {
  300         struct g_part_apm_entry *entry;
  301         int error;
  302 
  303         entry = (struct g_part_apm_entry *)baseentry;
  304         if (gpp->gpp_parms & G_PART_PARM_LABEL) {
  305                 if (strlen(gpp->gpp_label) > sizeof(entry->ent.ent_name))
  306                         return (EINVAL);
  307         }
  308         if (gpp->gpp_parms & G_PART_PARM_TYPE) {
  309                 error = apm_parse_type(gpp->gpp_type, entry->ent.ent_type,
  310                     sizeof(entry->ent.ent_type));
  311                 if (error)
  312                         return (error);
  313         }
  314         if (gpp->gpp_parms & G_PART_PARM_LABEL) {
  315                 strncpy(entry->ent.ent_name, gpp->gpp_label,
  316                     sizeof(entry->ent.ent_name));
  317         }
  318         return (0);
  319 }
  320 
  321 static const char *
  322 g_part_apm_name(struct g_part_table *table, struct g_part_entry *baseentry,
  323     char *buf, size_t bufsz)
  324 {
  325 
  326         snprintf(buf, bufsz, "s%d", baseentry->gpe_index + 1);
  327         return (buf);
  328 }
  329 
  330 static int
  331 g_part_apm_probe(struct g_part_table *basetable, struct g_consumer *cp)
  332 {
  333         struct g_provider *pp;
  334         struct g_part_apm_table *table;
  335         char *buf;
  336         int error;
  337 
  338         /* We don't nest, which means that our depth should be 0. */
  339         if (basetable->gpt_depth != 0)
  340                 return (ENXIO);
  341 
  342         table = (struct g_part_apm_table *)basetable;
  343         table->tivo_series1 = 0;
  344         pp = cp->provider;
  345 
  346         /* Sanity-check the provider. */
  347         if (pp->mediasize < 4 * pp->sectorsize)
  348                 return (ENOSPC);
  349 
  350         /* Check that there's a Driver Descriptor Record (DDR). */
  351         buf = g_read_data(cp, 0L, pp->sectorsize, &error);
  352         if (buf == NULL)
  353                 return (error);
  354         if (be16dec(buf) == be16toh(APM_DDR_SIG)) {
  355                 /* Normal Apple DDR */
  356                 table->ddr.ddr_sig = be16dec(buf);
  357                 table->ddr.ddr_blksize = be16dec(buf + 2);
  358                 table->ddr.ddr_blkcount = be32dec(buf + 4);
  359                 g_free(buf);
  360                 if (table->ddr.ddr_blksize != pp->sectorsize)
  361                         return (ENXIO);
  362         } else {
  363                 /*
  364                  * Check for Tivo drives, which have no DDR and a different
  365                  * signature.  Those whose first two bytes are 14 92 are
  366                  * Series 2 drives, and aren't supported.  Those that start
  367                  * with 92 14 are series 1 drives and are supported.
  368                  */
  369                 if (be16dec(buf) != 0x9214) {
  370                         /* If this is 0x1492 it could be a series 2 drive */
  371                         g_free(buf);
  372                         return (ENXIO);
  373                 }
  374                 table->ddr.ddr_sig = APM_DDR_SIG;               /* XXX */
  375                 table->ddr.ddr_blksize = pp->sectorsize;        /* XXX */
  376                 table->ddr.ddr_blkcount = pp->mediasize / pp->sectorsize;/* XXX */
  377                 table->tivo_series1 = 1;
  378                 g_free(buf);
  379         }
  380 
  381         /* Check that there's a Partition Map. */
  382         error = apm_read_ent(cp, 1, &table->self, table->tivo_series1);
  383         if (error)
  384                 return (error);
  385         if (table->self.ent_sig != APM_ENT_SIG)
  386                 return (ENXIO);
  387         if (strcmp(table->self.ent_type, APM_ENT_TYPE_SELF))
  388                 return (ENXIO);
  389         if (table->self.ent_pmblkcnt >= table->ddr.ddr_blkcount)
  390                 return (ENXIO);
  391         return (G_PART_PROBE_PRI_NORM);
  392 }
  393 
  394 static int
  395 g_part_apm_read(struct g_part_table *basetable, struct g_consumer *cp)
  396 {
  397         struct apm_ent ent;
  398         struct g_part_apm_entry *entry;
  399         struct g_part_apm_table *table;
  400         int error, index;
  401 
  402         table = (struct g_part_apm_table *)basetable;
  403 
  404         basetable->gpt_first = table->self.ent_pmblkcnt + 1;
  405         basetable->gpt_last = table->ddr.ddr_blkcount - 1;
  406         basetable->gpt_entries = table->self.ent_pmblkcnt - 1;
  407 
  408         for (index = table->self.ent_pmblkcnt - 1; index > 0; index--) {
  409                 error = apm_read_ent(cp, index + 1, &ent, table->tivo_series1);
  410                 if (error)
  411                         continue;
  412                 if (!strcmp(ent.ent_type, APM_ENT_TYPE_UNUSED))
  413                         continue;
  414                 entry = (struct g_part_apm_entry *)g_part_new_entry(basetable,
  415                     index, ent.ent_start, ent.ent_start + ent.ent_size - 1);
  416                 entry->ent = ent;
  417         }
  418 
  419         return (0);
  420 }
  421 
  422 static const char *
  423 g_part_apm_type(struct g_part_table *basetable, struct g_part_entry *baseentry,
  424     char *buf, size_t bufsz)
  425 {
  426         struct g_part_apm_entry *entry;
  427         const char *type;
  428         size_t len;
  429 
  430         entry = (struct g_part_apm_entry *)baseentry;
  431         type = entry->ent.ent_type;
  432         if (!strcmp(type, APM_ENT_TYPE_FREEBSD))
  433                 return (g_part_alias_name(G_PART_ALIAS_FREEBSD));
  434         if (!strcmp(type, APM_ENT_TYPE_FREEBSD_SWAP))
  435                 return (g_part_alias_name(G_PART_ALIAS_FREEBSD_SWAP));
  436         if (!strcmp(type, APM_ENT_TYPE_FREEBSD_UFS))
  437                 return (g_part_alias_name(G_PART_ALIAS_FREEBSD_UFS));
  438         if (!strcmp(type, APM_ENT_TYPE_FREEBSD_VINUM))
  439                 return (g_part_alias_name(G_PART_ALIAS_FREEBSD_VINUM));
  440         if (!strcmp(type, APM_ENT_TYPE_FREEBSD_ZFS))
  441                 return (g_part_alias_name(G_PART_ALIAS_FREEBSD_ZFS));
  442         buf[0] = '!';
  443         len = MIN(sizeof(entry->ent.ent_type), bufsz - 2);
  444         bcopy(type, buf + 1, len);
  445         buf[len + 1] = '\0';
  446         return (buf);
  447 }
  448 
  449 static int
  450 g_part_apm_write(struct g_part_table *basetable, struct g_consumer *cp)
  451 {
  452         char buf[512];
  453         struct g_part_entry *baseentry;
  454         struct g_part_apm_entry *entry;
  455         struct g_part_apm_table *table;
  456         int error, index;
  457 
  458         table = (struct g_part_apm_table *)basetable;
  459         /*
  460          * Tivo Series 1 disk partitions are currently read-only.
  461          */
  462         if (table->tivo_series1)
  463                 return (EOPNOTSUPP);
  464         bzero(buf, sizeof(buf));
  465 
  466         /* Write the DDR and 'self' entry only when we're newly created. */
  467         if (basetable->gpt_created) {
  468                 be16enc(buf, table->ddr.ddr_sig);
  469                 be16enc(buf + 2, table->ddr.ddr_blksize);
  470                 be32enc(buf + 4, table->ddr.ddr_blkcount);
  471                 error = g_write_data(cp, 0, buf, sizeof(buf));
  472                 if (error)
  473                         return (error);
  474         }
  475 
  476         be16enc(buf, table->self.ent_sig);
  477         be16enc(buf + 2, 0);
  478         be32enc(buf + 4, table->self.ent_pmblkcnt);
  479 
  480         if (basetable->gpt_created) {
  481                 be32enc(buf + 8, table->self.ent_start);
  482                 be32enc(buf + 12, table->self.ent_size);
  483                 bcopy(table->self.ent_name, buf + 16,
  484                     sizeof(table->self.ent_name));
  485                 bcopy(table->self.ent_type, buf + 48,
  486                     sizeof(table->self.ent_type));
  487                 error = g_write_data(cp, 512, buf, sizeof(buf));
  488                 if (error)
  489                         return (error);
  490         }
  491 
  492         baseentry = LIST_FIRST(&basetable->gpt_entry);
  493         for (index = 1; index <= basetable->gpt_entries; index++) {
  494                 entry = (baseentry != NULL && index == baseentry->gpe_index)
  495                     ? (struct g_part_apm_entry *)baseentry : NULL;
  496                 if (entry != NULL && !baseentry->gpe_deleted) {
  497                         be32enc(buf + 8, entry->ent.ent_start);
  498                         be32enc(buf + 12, entry->ent.ent_size);
  499                         bcopy(entry->ent.ent_name, buf + 16,
  500                             sizeof(entry->ent.ent_name));
  501                         bcopy(entry->ent.ent_type, buf + 48,
  502                             sizeof(entry->ent.ent_type));
  503                 } else {
  504                         bzero(buf + 8, 4 + 4 + 32 + 32);
  505                         strcpy(buf + 48, APM_ENT_TYPE_UNUSED);
  506                 }
  507                 error = g_write_data(cp, (index + 1) * 512, buf, sizeof(buf));
  508                 if (error)
  509                         return (error);
  510                 if (entry != NULL)
  511                         baseentry = LIST_NEXT(baseentry, gpe_entry);
  512         }
  513 
  514         return (0);
  515 }

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