On Tue 18 Dec 2018 08:57:36 AM CET, Anton Nefedov wrote: > The flag is supposed to indicate that the region of the disk image has > to be sufficiently allocated so it reads as zeroes. > > The call with the flag set must return -ENOTSUP if allocation cannot > be done efficiently. > This has to be made sure of by both > - the drivers that support the flag > - and the common block layer (so it will not fall back to any slowpath > (like writing zero buffers) in case the driver does not support > the flag). > > Signed-off-by: Anton Nefedov <anton.nefe...@virtuozzo.com>
Reviewed-by: Alberto Garcia <be...@igalia.com> Berto
