> On Jul 31, 2019, at 1:45 AM, Edgar Fuß <[email protected]> wrote: > > NetBSD design error (or so Taylor says) that a vnode lock may be held accross > I/O
100% NetBSD's VFS locking protocol needs a serious overhaul. At least one other BSD-family VFS (the one in XNU) completely eliminated locking of vnodes at the VFS layer (it's all pushed into the file system back-ends who now have more control over their own locking requirements). It does have some additional complexities around reference / busy counting and vnode identity, but it works very well in practice. I don't know what FreeBSD has done in this area. -- thorpej
