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.c

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    1 /*-
    2  * Copyright (c) 2005 Ivan Voras <ivoras@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 
   27 #include <sys/cdefs.h>
   28 __FBSDID("$FreeBSD$");
   29 
   30 #include <sys/param.h>
   31 #include <sys/endian.h>
   32 
   33 #include <geom/virstor/g_virstor_md.h>
   34 #include <geom/virstor/binstream.h>
   35 
   36 /*
   37  * Encode data from g_virstor_metadata structure into a endian-independant
   38  * byte stream.
   39  */
   40 void
   41 virstor_metadata_encode(struct g_virstor_metadata *md, unsigned char *data)
   42 {
   43         bin_stream_t bs;
   44 
   45         bs_open(&bs, data);
   46 
   47         bs_write_buf(&bs, md->md_magic, sizeof(md->md_magic));
   48         bs_write_u32(&bs, md->md_version);
   49         bs_write_buf(&bs, md->md_name, sizeof(md->md_name));
   50         bs_write_u64(&bs, md->md_virsize);
   51         bs_write_u32(&bs, md->md_chunk_size);
   52         bs_write_u32(&bs, md->md_id);
   53         bs_write_u16(&bs, md->md_count);
   54 
   55         bs_write_buf(&bs, md->provider, sizeof(md->provider));
   56         bs_write_u16(&bs, md->no);
   57         bs_write_u64(&bs, md->provsize);
   58         bs_write_u32(&bs, md->chunk_count);
   59         bs_write_u32(&bs, md->chunk_next);
   60         bs_write_u16(&bs, md->chunk_reserved);
   61         bs_write_u16(&bs, md->flags);
   62 }
   63 
   64 
   65 /*
   66  * Decode data from endian-independant byte stream into g_virstor_metadata
   67  * structure.
   68  */
   69 void
   70 virstor_metadata_decode(unsigned char *data, struct g_virstor_metadata *md)
   71 {
   72         bin_stream_t bs;
   73 
   74         bs_open(&bs, (char *)(data));
   75 
   76         bs_read_buf(&bs, md->md_magic, sizeof(md->md_magic));
   77         md->md_version = bs_read_u32(&bs);
   78         bs_read_buf(&bs, md->md_name, sizeof(md->md_name));
   79         md->md_virsize = bs_read_u64(&bs);
   80         md->md_chunk_size = bs_read_u32(&bs);
   81         md->md_id = bs_read_u32(&bs);
   82         md->md_count = bs_read_u16(&bs);
   83 
   84         bs_read_buf(&bs, md->provider, sizeof(md->provider));
   85         md->no = bs_read_u16(&bs);
   86         md->provsize = bs_read_u64(&bs);
   87         md->chunk_count = bs_read_u32(&bs);
   88         md->chunk_next = bs_read_u32(&bs);
   89         md->chunk_reserved = bs_read_u16(&bs);
   90         md->flags = bs_read_u16(&bs);
   91 }

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