Post Syndicated from corbet original https://lwn.net/Articles/940808/

LWN recently covered a discussion on
file-position locking that demonstrated the hazards that can result
from unexpected concurrency. It turns out that this discussion had not yet
fully run its course. Since that article was written, additional changes
intended to address a performance regression evolved into a core virtual
filesystem (VFS) layer API change to carry out some much-delayed housecleaning.