Revision 7454d600

b/block/qcow2-refcount.c
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                        nb_csectors = ((offset >> s->csize_shift) &
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                                       s->csize_mask) + 1;
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                        if (addend != 0) {
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                            int ret;
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                            ret = update_refcount(bs,
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                                (offset & s->cluster_offset_mask) & ~511,
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                                nb_csectors * 512, addend,

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