Revision 0aa217e4 block/qcow2.c

b/block/qcow2.c
145 145 
    QCowHeader header;
146 146 
    uint64_t ext_end;
147 147 

  		





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    /* Performance is terrible right now with cache=writethrough due mainly


  		





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     * to reference count updates.  If the user does not explicitly specify


  		





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     * a caching type, force to writeback caching.


  		





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     */


  		





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    if ((flags & BDRV_O_CACHE_DEF)) {


  		





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        flags |= BDRV_O_CACHE_WB;


  		





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        flags &= ~BDRV_O_CACHE_DEF;


  		





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    }


  		





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    ret = bdrv_file_open(&s->hd, filename, flags);


  		





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    if (ret < 0)


  		





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        return ret;


  		












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