-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Il 19/07/2013 15:21, Eric Blake ha scritto: > Question (more for my understanding, not that you need to change > code): must we blindly return 0 in the presence of a backing file, > or is it possible to recursively query the backing_hd's zero_init > status, allowing us to return 1 iff all files in the chain support > zero_init.
No, it's really blind. bdrv_has_zero_init is like "was the image all zeros at creation time", and the answer is no because the content of the image used to be the same as the backing_hd. Paolo -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.19 (GNU/Linux) Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/ iQIcBAEBAgAGBQJR6T3bAAoJEBvWZb6bTYbyraEP/04nt2HxFsX+na7q/Ax7bGYn Z0RvyP2zTukfv8dM9aJVjmQEvLRnp7ROQlSOXPbxF3gzr2nh67nb27Xi+vF0B3N0 fDQTnnUX/8Zz2jigolDCSSFp0ggDWRtVID+W/olfIQMAJI1PkRdt0VJQp9aeLGZV 7tae/Fl5AQtfZfAW6Ji4FZzJcmLDyM7HoveZxnAawGy9e17opKGFmKUmBNutew0C LoKDkakWRrW/k4IzXB0TJOtQ5hOn5yoG16VjYG1YKblewRqaciFba62T+Z4ClJB0 TKJEr3fuGokI9mPoyPCpuZF0ZPEFFI26Mwocag8TpCS5IYJzJjC7RcGDW5CV4zzC Lzr3fGeTTtEOCJfdF4GtqeSp2S+1QWuagLLr31cV1KpnuKVLItsQ95gDpZMtqjC0 FKLkF7g/BQrE/UgGzJ16YuF4h+Ct8+2Ihiz0BS6OD6ie2g9Ds/u1l/TCn/jfj+ID PJhDUcDPynBqy+i1V475w+ZY7lLpE7oOg1HPJvQLqFgc6XkPTI75EttpWB01NOoO vKfugwxKJBfLFCX/oWbTk04P69dysLJLeb/WedTrqWAdn/to0bhD1aKX2rV+aYx3 Rs+7DescTrGV+n6qcdx2TUEqswCyMrBoStBUwEGuM+S+EVFQ7KitAY83puNUO3zX qAEpAOUWyqE0WXG3s7Ee =ltDY -----END PGP SIGNATURE-----
