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

     /*-
      * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
      *
      * Copyright (c) 2004-2005 Pawel Jakub Dawidek <pjd@FreeBSD.org>
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     * $FreeBSD$
     */
    
    #ifndef _G_LABEL_H_
    #define _G_LABEL_H_
    
    #include <sys/endian.h>
    #ifdef _KERNEL
    #include <sys/sysctl.h>
    #endif
    
    #define G_LABEL_CLASS_NAME      "LABEL"
    
    #define G_LABEL_MAGIC           "GEOM::LABEL"
    /*
     * Version history:
     * 1 - Initial version number.
     * 2 - Added md_provsize field to metadata.
     */
    #define G_LABEL_VERSION         2
    
    #ifdef _KERNEL
    extern u_int g_label_debug;
    
    #define G_LABEL_DEBUG(lvl, ...) \
        _GEOM_DEBUG("GEOM_LABEL", g_label_debug, (lvl), NULL, __VA_ARGS__)
    
    SYSCTL_DECL(_kern_geom_label);
    
    #define G_LABEL_INIT(kind, label, descr)                                \
            SYSCTL_NODE(_kern_geom_label, OID_AUTO, kind,                   \
                CTLFLAG_RD | CTLFLAG_MPSAFE,                                \
                NULL, "");                                                  \
            SYSCTL_INT(_kern_geom_label_##kind, OID_AUTO, enable,           \
                CTLFLAG_RWTUN, &label.ld_enabled, 1, descr)
    
    typedef void g_label_taste_t (struct g_consumer *cp, char *label, size_t size);
    
    struct g_label_desc {
            g_label_taste_t *ld_taste;
            char            *ld_dirprefix;
            int              ld_enabled;
    };
    
    /* Supported labels. */
    extern struct g_label_desc g_label_ufs_id;
    extern struct g_label_desc g_label_ufs_volume;
    extern struct g_label_desc g_label_iso9660;
    extern struct g_label_desc g_label_msdosfs;
    extern struct g_label_desc g_label_ext2fs;
    extern struct g_label_desc g_label_reiserfs;
    extern struct g_label_desc g_label_ntfs;
    extern struct g_label_desc g_label_gpt;
    extern struct g_label_desc g_label_gpt_uuid;
    extern struct g_label_desc g_label_disk_ident;
    extern struct g_label_desc g_label_flashmap;
    
    extern void g_label_rtrim(char *label, size_t size);
    #endif  /* _KERNEL */
    
    struct g_label_metadata {
            char            md_magic[16];   /* Magic value. */
            uint32_t        md_version;     /* Version number. */
            char            md_label[16];   /* Label. */
            uint64_t        md_provsize;    /* Provider's size. */
    };
    static __inline void
    label_metadata_encode(const struct g_label_metadata *md, u_char *data)
    {
    
            bcopy(md->md_magic, data, sizeof(md->md_magic));
            le32enc(data + 16, md->md_version);
           bcopy(md->md_label, data + 20, sizeof(md->md_label));
           le64enc(data + 36, md->md_provsize);
   }
   static __inline void
   label_metadata_decode(const u_char *data, struct g_label_metadata *md)
   {
   
           bcopy(data, md->md_magic, sizeof(md->md_magic));
           md->md_version = le32dec(data + 16);
           bcopy(data + 20, md->md_label, sizeof(md->md_label));
           md->md_provsize = le64dec(data + 36);
   }
   #endif  /* _G_LABEL_H_ */

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