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/virstor/g_virstor_md.h

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    1 /*-
    2  * Copyright (c) 2005 Ivan Voras <ivoras@gmail.com>
    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/10.3/sys/geom/virstor/g_virstor_md.h 172302 2007-09-23 07:34:23Z pjd $
   27  */
   28 
   29 
   30 #ifndef _G_VIRSTOR_MD_H_
   31 #define _G_VIRSTOR_MD_H_
   32 
   33 /*
   34  * Metadata declaration
   35  */
   36 
   37 #define G_VIRSTOR_MAGIC         "GEOM::VIRSTOR"
   38 #define G_VIRSTOR_VERSION       1
   39 
   40 /* flag: provider is allocated */
   41 #define VIRSTOR_PROVIDER_ALLOCATED      1
   42 /* flag: provider is currently being filled (usually it's the last
   43  * provider with VIRSTOR_PROVIDER_ALLOCATED flag */
   44 #define VIRSTOR_PROVIDER_CURRENT        2
   45 
   46 struct g_virstor_metadata {
   47         /* Data global to the virstor device */
   48         char            md_magic[16];           /* Magic value. */
   49         uint32_t        md_version;             /* Version number. */
   50         char            md_name[16];            /* Device name (e.g. "mydata") */
   51         uint32_t        md_id;                  /* Unique ID. */
   52         uint64_t        md_virsize;             /* Virtual device's size */
   53         uint32_t        md_chunk_size;          /* Chunk size in bytes */
   54         uint16_t        md_count;               /* Total number of providers */
   55 
   56         /* Data local to this provider */
   57         char            provider[16];           /* Hardcoded provider name */
   58         uint16_t        no;                     /* Provider number/index */
   59         uint64_t        provsize;               /* Provider's size */
   60         uint32_t        chunk_count;            /* Number of chunks in this pr. */
   61         uint32_t        chunk_next;             /* Next chunk to allocate */
   62         uint16_t        chunk_reserved;         /* Count of "reserved" chunks */
   63         uint16_t        flags;                  /* Provider's flags */
   64 };
   65 
   66 void virstor_metadata_encode(struct g_virstor_metadata *md, unsigned char *data);
   67 void virstor_metadata_decode(unsigned char *data, struct g_virstor_metadata *md);
   68 
   69 #endif  /* !_G_VIRSTOR_H_ */

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