Messages in this thread | | | Date | Mon, 20 Jan 2014 13:56:26 +0400 | Subject | Re: [PATCH v7 0/7] Add O_DENY* support for VFS and CIFS/NFS | From | Pavel Shilovsky <> |
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2014/1/17 Frank Filz <ffilzlnx@mindspring.com>: > This looks wonderful and will be useful to the Ganesha user space NFS server > also. > > I do have a couple questions. > > 1. How will this interact with the idea of private locks from the patch set > Jeff Layton has been pushing?
They don't touch each other.
> > 2. If a process opens multiple file descriptors with deny modes, will they > conflict with each other (which is the behavior we will want for Ganesha).
Yes, a deny mode is associated with file descriptor - so, it will conflict with any other access/deny modes of file descriptors from any process.
> > 3. Is there any functionality to upgrade or downgrade the access and deny > modes (thinking in terms of NFS v4 support of OPEN upgrade and > OPEN_DOWNGRADE operations).
The proposed patchset doesn't allow to change deny modes after an open is done. But we can add a functionality to let flock syscall change deny modes as on option.
-- Best regards, Pavel Shilovsky.
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