On Fri, 2021-08-20 at 17:29 -0400, Jeff Layton wrote: > No, Windows has deny-mode locking at open time, but the kernel's > mandatory locks are enforced during read/write (which is why they are > such a pain). Samba will not miss these at all. > > If we want something to provide windows-like semantics, we'd probably > want to start with something like Pavel Shilovsky's O_DENY_* patches. > > -- Jeff > Doh! It completely slipped my mind about byte-range locks on windows... Those are mandatory and they do block read and write activity to the ranges locked. They have weird semantics vs. POSIX locks (they stack instead of splitting/merging, etc.). Samba emulates these with (advisory) POSIX locks in most cases. Using mandatory locks is probably possible, but I think it would add more potential for deadlock and security issues. -- Jeff Layton <jlayton@xxxxxxxxxx>
