g_label.h

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2004-2005 Pawel Jakub Dawidek <pjd@FreeBSD.org>
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  *
   16  * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
   17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
   20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   26  * SUCH DAMAGE.
   27  *
   28  * $FreeBSD$
   29  */
   30 
   31 #ifndef _G_LABEL_H_
   32 #define _G_LABEL_H_
   33 
   34 #include <sys/endian.h>
   35 #ifdef _KERNEL
   36 #include <sys/sysctl.h>
   37 #endif
   38 
   39 #define G_LABEL_CLASS_NAME      "LABEL"
   40 
   41 #define G_LABEL_MAGIC           "GEOM::LABEL"
   42 /*
   43  * Version history:
   44  * 1 - Initial version number.
   45  * 2 - Added md_provsize field to metadata.
   46  */
   47 #define G_LABEL_VERSION         2
   48 #define G_LABEL_DIR             "label"
   49 
   50 #ifdef _KERNEL
   51 extern u_int g_label_debug;
   52 
   53 #define G_LABEL_DEBUG(lvl, ...) do {                                    \
   54         if (g_label_debug >= (lvl)) {                                   \
   55                 printf("GEOM_LABEL");                                   \
   56                 if (g_label_debug > 0)                                  \
   57                         printf("[%u]", lvl);                            \
   58                 printf(": ");                                           \
   59                 printf(__VA_ARGS__);                                    \
   60                 printf("\n");                                           \
   61         }                                                               \
   62 } while (0)
   63 
   64 SYSCTL_DECL(_kern_geom_label);
   65 
   66 #define G_LABEL_INIT(kind, label, descr)                                \
   67         SYSCTL_NODE(_kern_geom_label, OID_AUTO, kind, CTLFLAG_RD,       \
   68             NULL, "");                                                  \
   69         SYSCTL_INT(_kern_geom_label_##kind, OID_AUTO, enable,           \
   70             CTLFLAG_RWTUN, &label.ld_enabled, 1, descr)
   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 extern struct g_label_desc g_label_flashmap;
   92 
   93 extern void g_label_rtrim(char *label, size_t size);
   94 #endif  /* _KERNEL */
   95 
   96 struct g_label_metadata {
   97         char            md_magic[16];   /* Magic value. */
   98         uint32_t        md_version;     /* Version number. */
   99         char            md_label[16];   /* Label. */
  100         uint64_t        md_provsize;    /* Provider's size. */
  101 };
  102 static __inline void
  103 label_metadata_encode(const struct g_label_metadata *md, u_char *data)
  104 {
  105 
  106         bcopy(md->md_magic, data, sizeof(md->md_magic));
  107         le32enc(data + 16, md->md_version);
  108         bcopy(md->md_label, data + 20, sizeof(md->md_label));
  109         le64enc(data + 36, md->md_provsize);
  110 }
  111 static __inline void
  112 label_metadata_decode(const u_char *data, struct g_label_metadata *md)
  113 {
  114 
  115         bcopy(data, md->md_magic, sizeof(md->md_magic));
  116         md->md_version = le32dec(data + 16);
  117         bcopy(data + 20, md->md_label, sizeof(md->md_label));
  118         md->md_provsize = le64dec(data + 36);
  119 }
  120 #endif  /* _G_LABEL_H_ */

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FreeBSD/Linux Kernel Cross Reference sys/geom/label/g_label.h

FreeBSD/Linux Kernel Cross Reference
sys/geom/label/g_label.h