search for: emulate_zero_with_pwrit

...the right thing to do unless we can guarantee that trimmed data is read back as zeroes. > > + # so nbdkit could call this even if the server doesn't support > > + # zeroing. If this is the case we must emulate. > > + if not h['can_zero']: > > + emulate_zero_with_pwrite(h, count, offset) > > + return > > + > > + # Construct the JSON request for zeroing. > > + buf = json.dumps({'op': "zero", > > + 'offset': offset, > > + 'size': count, >...

...calls, there is no 'can_zero' method > Do you mean h["can_zero"] set in getoptions()? > + # so nbdkit could call this even if the server doesn't support > + # zeroing. If this is the case we must emulate. > + if not h['can_zero']: > + emulate_zero_with_pwrite(h, count, offset) > + return > + > + # Construct the JSON request for zeroing. > + buf = json.dumps({'op': "zero", > + 'offset': offset, > + 'size': count, > + 'fl...

v5 was here: https://www.redhat.com/archives/libguestfs/2018-March/msg00032.html There is only a single patch in this version because the other patches went upstream. This patch adds the virt-v2v -o rhv-upload mode (https://bugzilla.redhat.com/show_bug.cgi?id=1557273). Compared to v5, this adds the ability to make zero, trim and flush requests to the oVirt imageio server

...transfer_service=h['transfer_service'] + + # Unlike the trim and flush calls, there is no 'can_zero' method + # so nbdkit could call this even if the server doesn't support + # zeroing. If this is the case we must emulate. + if not h['can_zero']: + emulate_zero_with_pwrite(h, count, offset) + return + + # Construct the JSON request for zeroing. + buf = json.dumps({'op': "zero", + 'offset': offset, + 'size': count, + 'flush': False}) + + http.putre...