Revision 5fafdf24 block-bochs.c

b/block-bochs.c
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/*
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 * Block driver for the various disk image formats used by Bochs
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 * Currently only for "growing" type in read-only mode
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 * 
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 *
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 * Copyright (c) 2005 Alex Beregszaszi
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 * 
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 *
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 * Permission is hereby granted, free of charge, to any person obtaining a copy
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 * of this software and associated documentation files (the "Software"), to deal
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 * in the Software without restriction, including without limitation the rights
......
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    char subtype[16]; // "Undoable" / "Volatile" / "Growing"
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    uint32_t version;
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    uint32_t header; // size of header
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    union {
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	struct {
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	    uint32_t catalog; // num of entries
......
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    char subtype[16]; // "Undoable" / "Volatile" / "Growing"
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    uint32_t version;
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    uint32_t header; // size of header
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    union {
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	struct {
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	    uint32_t catalog; // num of entries
......
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    uint32_t *catalog_bitmap;
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    int catalog_size;
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    int data_offset;
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    int bitmap_blocks;
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    int extent_blocks;
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    int extent_size;
......
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static int bochs_probe(const uint8_t *buf, int buf_size, const char *filename)
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{
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    const struct bochs_header *bochs = (const void *)buf;
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    if (buf_size < HEADER_SIZE)
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	return 0;
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......
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        if (fd < 0)
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            return -1;
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    }
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    bs->read_only = 1; // no write support yet
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    s->fd = fd;
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    if (read(fd, &bochs, sizeof(bochs)) != sizeof(bochs)) {
......
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    s->bitmap_blocks = 1 + (le32_to_cpu(bochs.extra.redolog.bitmap) - 1) / 512;
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    s->extent_blocks = 1 + (le32_to_cpu(bochs.extra.redolog.extent) - 1) / 512;
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    s->extent_size = le32_to_cpu(bochs.extra.redolog.extent);
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    return 0;
......
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    // seek to sector
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    extent_index = offset / s->extent_size;
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    extent_offset = (offset % s->extent_size) / 512;
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    if (s->catalog_bitmap[extent_index] == 0xffffffff)
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    {
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//	fprintf(stderr, "page not allocated [%x - %x:%x]\n",
......
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    bitmap_offset = s->data_offset + (512 * s->catalog_bitmap[extent_index] *
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	(s->extent_blocks + s->bitmap_blocks));
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    block_offset = bitmap_offset + (512 * (s->bitmap_blocks + extent_offset));
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//    fprintf(stderr, "sect: %x [ext i: %x o: %x] -> %x bitmap: %x block: %x\n",
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//	sector_num, extent_index, extent_offset,
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//	le32_to_cpu(s->catalog_bitmap[extent_index]),
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//	bitmap_offset, block_offset);
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    // read in bitmap for current extent
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    lseek(s->fd, bitmap_offset + (extent_offset / 8), SEEK_SET);
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    read(s->fd, &bitmap_entry, 1);
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    if (!((bitmap_entry >> (extent_offset % 8)) & 1))
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    {
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//	fprintf(stderr, "sector (%x) in bitmap not allocated\n",
......
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    }
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    lseek(s->fd, block_offset, SEEK_SET);
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    return 0;
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}
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static int bochs_read(BlockDriverState *bs, int64_t sector_num, 
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static int bochs_read(BlockDriverState *bs, int64_t sector_num,
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                    uint8_t *buf, int nb_sectors)
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{
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    BDRVBochsState *s = bs->opaque;

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