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: src/sys/geom/label/g_label.h,v 1.3.2.1 2005/03/01 14:22:30 pjd Exp $
   27  */
   28 
   29 #ifndef _G_LABEL_H_
   30 #define _G_LABEL_H_
   31 
   32 #include <sys/endian.h>
   33 
   34 #define G_LABEL_CLASS_NAME      "LABEL"
   35 
   36 #define G_LABEL_MAGIC           "GEOM::LABEL"
   37 /*
   38  * Version history:
   39  * 1 - Initial version number.
   40  * 2 - Added md_provsize field to metadata.
   41  */
   42 #define G_LABEL_VERSION         2
   43 #define G_LABEL_DIR             "label"
   44 
   45 #ifdef _KERNEL
   46 extern u_int g_label_debug;
   47 
   48 #define G_LABEL_DEBUG(lvl, ...) do {                                    \
   49         if (g_label_debug >= (lvl)) {                                   \
   50                 printf("GEOM_LABEL");                                   \
   51                 if (g_label_debug > 0)                                  \
   52                         printf("[%u]", lvl);                            \
   53                 printf(": ");                                           \
   54                 printf(__VA_ARGS__);                                    \
   55                 printf("\n");                                           \
   56         }                                                               \
   57 } while (0)
   58 
   59 typedef void g_label_taste_t (struct g_consumer *cp, char *label, size_t size);
   60 
   61 struct g_label_desc {
   62         g_label_taste_t *ld_taste;
   63         char            *ld_dir;
   64 };
   65 
   66 /* Supported labels. */
   67 extern const struct g_label_desc g_label_ufs;
   68 extern const struct g_label_desc g_label_iso9660;
   69 extern const struct g_label_desc g_label_msdosfs;
   70 #endif  /* _KERNEL */
   71 
   72 struct g_label_metadata {
   73         char            md_magic[16];   /* Magic value. */
   74         uint32_t        md_version;     /* Version number. */
   75         char            md_label[16];   /* Label. */
   76         uint64_t        md_provsize;    /* Provider's size. */
   77 };
   78 static __inline void
   79 label_metadata_encode(const struct g_label_metadata *md, u_char *data)
   80 {
   81 
   82         bcopy(md->md_magic, data, sizeof(md->md_magic));
   83         le32enc(data + 16, md->md_version);
   84         bcopy(md->md_label, data + 20, sizeof(md->md_label));
   85         le64enc(data + 36, md->md_provsize);
   86 }
   87 static __inline void
   88 label_metadata_decode(const u_char *data, struct g_label_metadata *md)
   89 {
   90 
   91         bcopy(data, md->md_magic, sizeof(md->md_magic));
   92         md->md_version = le32dec(data + 16);
   93         bcopy(data + 20, md->md_label, sizeof(md->md_label));
   94         md->md_provsize = le64dec(data + 36);
   95 }
   96 #endif  /* _G_LABEL_H_ */

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