g_label_gpt.c

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    1 /*-
    2  * Copyright (c) 2008 Marius Nuennerich
    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  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  */
   26 
   27 #include <sys/cdefs.h>
   28 __FBSDID("$FreeBSD: releng/11.0/sys/geom/label/g_label_gpt.c 223921 2011-07-11 05:22:31Z ae $");
   29 
   30 #include <sys/param.h>
   31 #include <sys/systm.h>
   32 #include <sys/kernel.h>
   33 #include <sys/malloc.h>
   34 #include <sys/kobj.h>
   35 #include <sys/gpt.h>
   36 #include <sys/sbuf.h>
   37 
   38 #include <geom/geom.h>
   39 #include <geom/label/g_label.h>
   40 #include <geom/part/g_part.h>
   41 
   42 #define PART_CLASS_NAME "PART"
   43 #define SCHEME_NAME     "GPT"
   44 
   45 #define G_LABEL_GPT_VOLUME_DIR  "gpt"
   46 #define G_LABEL_GPT_ID_DIR      "gptid"
   47 
   48 /* XXX: Also defined in geom/part/g_part_gpt.c */
   49 struct g_part_gpt_entry {
   50         struct g_part_entry     base;
   51         struct gpt_ent          ent;
   52 };
   53 
   54 /* XXX: Shamelessly stolen from g_part_gpt.c */
   55 static void
   56 sbuf_nprintf_utf16(struct sbuf *sb, uint16_t *str, size_t len)
   57 {
   58         u_int bo;
   59         uint32_t ch;
   60         uint16_t c;
   61 
   62         bo = LITTLE_ENDIAN;     /* GPT is little-endian */
   63         while (len > 0 && *str != 0) {
   64                 ch = (bo == BIG_ENDIAN) ? be16toh(*str) : le16toh(*str);
   65                 str++, len--;
   66                 if ((ch & 0xf800) == 0xd800) {
   67                         if (len > 0) {
   68                                 c = (bo == BIG_ENDIAN) ? be16toh(*str)
   69                                     : le16toh(*str);
   70                                 str++, len--;
   71                         } else
   72                                 c = 0xfffd;
   73                         if ((ch & 0x400) == 0 && (c & 0xfc00) == 0xdc00) {
   74                                 ch = ((ch & 0x3ff) << 10) + (c & 0x3ff);
   75                                 ch += 0x10000;
   76                         } else
   77                                 ch = 0xfffd;
   78                 } else if (ch == 0xfffe) { /* BOM (U+FEFF) swapped. */
   79                         bo = (bo == BIG_ENDIAN) ? LITTLE_ENDIAN : BIG_ENDIAN;
   80                         continue;
   81                 } else if (ch == 0xfeff) /* BOM (U+FEFF) unswapped. */
   82                         continue;
   83 
   84                 /* Write the Unicode character in UTF-8 */
   85                 if (ch < 0x80)
   86                         sbuf_printf(sb, "%c", ch);
   87                 else if (ch < 0x800)
   88                         sbuf_printf(sb, "%c%c", 0xc0 | (ch >> 6),
   89                             0x80 | (ch & 0x3f));
   90                 else if (ch < 0x10000)
   91                         sbuf_printf(sb, "%c%c%c", 0xe0 | (ch >> 12),
   92                             0x80 | ((ch >> 6) & 0x3f), 0x80 | (ch & 0x3f));
   93                 else if (ch < 0x200000)
   94                         sbuf_printf(sb, "%c%c%c%c", 0xf0 | (ch >> 18),
   95                             0x80 | ((ch >> 12) & 0x3f),
   96                             0x80 | ((ch >> 6) & 0x3f), 0x80 | (ch & 0x3f));
   97         }
   98 }
   99 
  100 static void
  101 g_label_gpt_taste(struct g_consumer *cp, char *label, size_t size)
  102 {
  103         struct g_provider *pp;
  104         struct g_part_table *tp;
  105         struct g_part_gpt_entry *part_gpt_entry;
  106         struct sbuf *lbl;
  107 
  108         g_topology_assert_not();
  109         pp = cp->provider;
  110         tp = (struct g_part_table *)pp->geom->softc;
  111         label[0] = '\0';
  112 
  113         /* We taste only partitions handled by GPART */
  114         if (strncmp(pp->geom->class->name, PART_CLASS_NAME, sizeof(PART_CLASS_NAME)))
  115                 return;
  116         /* and only GPT */
  117         if (strncmp(tp->gpt_scheme->name, SCHEME_NAME, sizeof(SCHEME_NAME)))
  118                 return;
  119 
  120         part_gpt_entry = (struct g_part_gpt_entry *)pp->private;
  121 
  122         /*
  123          * Create sbuf with biggest possible size.
  124          * We need max. 4 bytes for every 2-byte utf16 char.
  125          */
  126         lbl = sbuf_new(NULL, NULL, sizeof(part_gpt_entry->ent.ent_name) << 1, SBUF_FIXEDLEN);
  127         /* Size is the number of characters, not bytes */
  128         sbuf_nprintf_utf16(lbl, part_gpt_entry->ent.ent_name, sizeof(part_gpt_entry->ent.ent_name) >> 1);
  129         sbuf_finish(lbl);
  130         strlcpy(label, sbuf_data(lbl), size);
  131         sbuf_delete(lbl);
  132 }
  133 
  134 static void
  135 g_label_gpt_uuid_taste(struct g_consumer *cp, char *label, size_t size)
  136 {
  137         struct g_provider *pp;
  138         struct g_part_table *tp;
  139         struct g_part_gpt_entry *part_gpt_entry;
  140 
  141         g_topology_assert_not();
  142         pp = cp->provider;
  143         tp = (struct g_part_table *)pp->geom->softc;
  144         label[0] = '\0';
  145 
  146         /* We taste only partitions handled by GPART */
  147         if (strncmp(pp->geom->class->name, PART_CLASS_NAME, sizeof(PART_CLASS_NAME)))
  148                 return;
  149         /* and only GPT */
  150         if (strncmp(tp->gpt_scheme->name, SCHEME_NAME, sizeof(SCHEME_NAME)))
  151                 return;
  152 
  153         part_gpt_entry = (struct g_part_gpt_entry *)pp->private;
  154         snprintf_uuid(label, size, &part_gpt_entry->ent.ent_uuid);
  155 }
  156 
  157 struct g_label_desc g_label_gpt = {
  158         .ld_taste = g_label_gpt_taste,
  159         .ld_dir = G_LABEL_GPT_VOLUME_DIR,
  160         .ld_enabled = 1
  161 };
  162 
  163 struct g_label_desc g_label_gpt_uuid = {
  164         .ld_taste = g_label_gpt_uuid_taste,
  165         .ld_dir = G_LABEL_GPT_ID_DIR,
  166         .ld_enabled = 1
  167 };
  168 
  169 G_LABEL_INIT(gpt, g_label_gpt, "Create device nodes for GPT labels");
  170 G_LABEL_INIT(gptid, g_label_gpt_uuid, "Create device nodes for GPT UUIDs");

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FreeBSD/Linux Kernel Cross Reference sys/geom/label/g_label_gpt.c

FreeBSD/Linux Kernel Cross Reference
sys/geom/label/g_label_gpt.c