Re: GlusterFS API to manipulate open file descriptor - glfs_fcntl?

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It would be great if you can point at the requirements, or new additions you are talking about.


On Tue, Oct 15, 2019 at 12:26 PM Anoop C S <anoopcs@xxxxxxxxxxxxx> wrote:
Hi all,

This is to check and confirm whether we have an API(or an internal
implementation which can be exposed as API) to perform operations on an
open file descriptor as a wrapper around existing fcntl() system call.
We do have specific APIs for locks(glfs_posix_lock) and file descriptor
duplication(glfs_dup) which are important among those operations listed
as per man fcntl(2). 

At present we have a requirement(very recent) from Samba to set file
descriptor flags through its VFS layer which would need a corresponding
mechanism inside GlusterFS. Due to its absence, VFS module for
GlusterFS inside Samba will have to workaround with the hack of
creating fake local file descriptors outside GlusterFS.

Thoughts and suggestions are welcome.


If there is a need have a feature, it makes sense to extend fd_t structure and provide it inside. If my memory serve right, we didn't support fcntl() behavior in gluster as there was no fcntl() through fuse when we started.. 

Would be good to understand what is needed, and then start working on design discussions. (if it makes sense).

-Amar
 
Anoop C S.

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