On 09/13/2017 12:03 PM, Eric Blake wrote: > During 'qemu-img compare', when we are checking that an allocated > portion of one file is all zeros, we don't need to waste time > computing how many additional sectors after the first non-zero > byte are also non-zero. Create a new helper find_nonzero() to do > the check for a first non-zero sector, and rebase > check_empty_sectors() to use it. > > The new interface intentionally uses bytes in its interface, even > though it still crawls the buffer a sector at a time; it is robust > to a partial sector at the end of the buffer. > > Signed-off-by: Eric Blake <[email protected]>
Reviewed-by: John Snow <[email protected]>
