I'm trying to get my head around the officially proper way of writing to NFS files (not just what works today, and what I think is supposed to work, since I was misunderstanding things about that recently). Is it correct to say that when writing data to NFS files, the only sequence of operations that Linux NFS clients officially support is the following: - all processes on all client machines close() the file - one machine (a client or the fileserver) opens() the file, writes to it, and close()s again - processes on client machines can now open() the file again for reading Other sequences of operations may work in some particular kernel version or under some circumstances, but are not guaranteed to work over kernel version changes or in general. In an official 'we guarantee that if you do this, things will work' sense, how does taking NFS locks interact with this required sequence? Do NFS locks make some part of it unnecessary, or does it remain necessary and NFS locks are just there to let you coordinate who has a magic 'you can write' token and you still officially need to close and open and so on? Thanks in advance. - cks
