On Mon, Jan 13, 2020 at 02:03:00PM +0800, Ian Kent wrote: > Oh wait, for systemd I was actually looking at: > https://github.com/systemd/systemd/blob/master/src/shared/switch-root.c > > > > > Mind you, that's not the actual systemd repo. either I probably > > need to look a lot deeper (and at the actual systemd repo) to > > work out what's actually being called. > > > > > Sigh... Guess I'll have to dig that Fedora KVM image out and > > > try to see what it's about... ;-/ Here comes a couple of hours > > > of build... D'oh... And yes, that would've been a bisect hazard - switch to path_lookupat() later in the series gets rid of that. Incremental (to be foldede, of course): diff --git a/fs/namei.c b/fs/namei.c index 1793661c3342..204677c37751 100644 --- a/fs/namei.c +++ b/fs/namei.c @@ -2634,7 +2634,7 @@ path_mountpoint(struct nameidata *nd, unsigned flags, struct path *path) (err = lookup_last(nd)) > 0) { s = trailing_symlink(nd); } - if (!err) + if (!err && (nd->flags & LOOKUP_RCU)) err = unlazy_walk(nd); if (!err) err = handle_lookup_down(nd);
