Re: [RFC] atomic create+open

From: Miklos Szeredi (miklos_at_szeredi.hu)
Date: 10/07/05

  • Next message: Lee Revell: "Re: 2.6.14-rc3-rt10 - xruns & config questions" 
    To: trond.myklebust@fys.uio.no
Date:	Fri, 07 Oct 2005 19:20:41 +0200

    > As I believe I said earlier, open by inode number/filehandle/... don't
    > exist in the NFSv4 protocol due to the potential for races.

    I must have missed this.

    Yes, open(O_CREAT) has race problems. Plain open() doesn't. So I
    still don't see why you want to use the open-by-name for the
    non-create case.

    > No. There is no race for setattr() etc since they only do one lookup
    > (and they don't set up any state on the server).
    >
    > open() is the only case where we currently have to look things up twice
    > (and I remind you that the second "lookup" is in fact the OPEN
    > operation).

    If NFS cannot do open by filehandle, then ->open_create() interface is
    not enough obviously.

    Miklos

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