Revision d5249393 block-cow.c

b/block-cow.c
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    while (nb_sectors > 0) {
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        if (is_changed(s->cow_bitmap, sector_num, nb_sectors, &n)) {
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            lseek64(s->fd, s->cow_sectors_offset + sector_num * 512, SEEK_SET);
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            lseek(s->fd, s->cow_sectors_offset + sector_num * 512, SEEK_SET);
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            ret = read(s->fd, buf, n * 512);
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            if (ret != n * 512)
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                return -1;
......
193 193 
    BDRVCowState *s = bs->opaque;
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    int ret, i;
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    lseek64(s->fd, s->cow_sectors_offset + sector_num * 512, SEEK_SET);
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    lseek(s->fd, s->cow_sectors_offset + sector_num * 512, SEEK_SET);
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    ret = write(s->fd, buf, nb_sectors * 512);
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    if (ret != nb_sectors * 512)
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        return -1;

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