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/label/g_label.h

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    1 /*-
    2  * Copyright (c) 2004-2005 Pawel Jakub Dawidek <pjd@FreeBSD.org>
    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 AUTHORS 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 AUTHORS 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  * $FreeBSD: releng/10.0/sys/geom/label/g_label.h 249508 2013-04-15 16:09:24Z ivoras $
   27  */
   28 
   29 #ifndef _G_LABEL_H_
   30 #define _G_LABEL_H_
   31 
   32 #include <sys/endian.h>
   33 #ifdef _KERNEL
   34 #include <sys/sysctl.h>
   35 #endif
   36 
   37 #define G_LABEL_CLASS_NAME      "LABEL"
   38 
   39 #define G_LABEL_MAGIC           "GEOM::LABEL"
   40 /*
   41  * Version history:
   42  * 1 - Initial version number.
   43  * 2 - Added md_provsize field to metadata.
   44  */
   45 #define G_LABEL_VERSION         2
   46 #define G_LABEL_DIR             "label"
   47 
   48 #ifdef _KERNEL
   49 extern u_int g_label_debug;
   50 
   51 #define G_LABEL_DEBUG(lvl, ...) do {                                    \
   52         if (g_label_debug >= (lvl)) {                                   \
   53                 printf("GEOM_LABEL");                                   \
   54                 if (g_label_debug > 0)                                  \
   55                         printf("[%u]", lvl);                            \
   56                 printf(": ");                                           \
   57                 printf(__VA_ARGS__);                                    \
   58                 printf("\n");                                           \
   59         }                                                               \
   60 } while (0)
   61 
   62 SYSCTL_DECL(_kern_geom_label);
   63 
   64 #define G_LABEL_INIT(kind, label, descr)                                \
   65         SYSCTL_NODE(_kern_geom_label, OID_AUTO, kind, CTLFLAG_RD,       \
   66             NULL, "");                                                  \
   67         SYSCTL_INT(_kern_geom_label_##kind, OID_AUTO, enable,           \
   68             CTLFLAG_RW, &label.ld_enabled, 1, descr);                   \
   69         TUNABLE_INT("kern.geom.label." __XSTRING(kind) ".enable",       \
   70             &label.ld_enabled)
   71 
   72 typedef void g_label_taste_t (struct g_consumer *cp, char *label, size_t size);
   73 
   74 struct g_label_desc {
   75         g_label_taste_t *ld_taste;
   76         char            *ld_dir;
   77         int              ld_enabled;
   78 };
   79 
   80 /* Supported labels. */
   81 extern struct g_label_desc g_label_ufs_id;
   82 extern struct g_label_desc g_label_ufs_volume;
   83 extern struct g_label_desc g_label_iso9660;
   84 extern struct g_label_desc g_label_msdosfs;
   85 extern struct g_label_desc g_label_ext2fs;
   86 extern struct g_label_desc g_label_reiserfs;
   87 extern struct g_label_desc g_label_ntfs;
   88 extern struct g_label_desc g_label_gpt;
   89 extern struct g_label_desc g_label_gpt_uuid;
   90 extern struct g_label_desc g_label_disk_ident;
   91 #endif  /* _KERNEL */
   92 
   93 struct g_label_metadata {
   94         char            md_magic[16];   /* Magic value. */
   95         uint32_t        md_version;     /* Version number. */
   96         char            md_label[16];   /* Label. */
   97         uint64_t        md_provsize;    /* Provider's size. */
   98 };
   99 static __inline void
  100 label_metadata_encode(const struct g_label_metadata *md, u_char *data)
  101 {
  102 
  103         bcopy(md->md_magic, data, sizeof(md->md_magic));
  104         le32enc(data + 16, md->md_version);
  105         bcopy(md->md_label, data + 20, sizeof(md->md_label));
  106         le64enc(data + 36, md->md_provsize);
  107 }
  108 static __inline void
  109 label_metadata_decode(const u_char *data, struct g_label_metadata *md)
  110 {
  111 
  112         bcopy(data, md->md_magic, sizeof(md->md_magic));
  113         md->md_version = le32dec(data + 16);
  114         bcopy(data + 20, md->md_label, sizeof(md->md_label));
  115         md->md_provsize = le64dec(data + 36);
  116 }
  117 #endif  /* _G_LABEL_H_ */

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