Re: [PATCH RFC] fuse: add generic file store

[Peng Tao <bergwolf@gmail.com>]

On Mon, Jun 7, 2021 at 11:34 PM Enrico Weigelt, metux IT consult
<lkml@metux.net> wrote:
>
> On 02.06.21 17:50, Alessio Balsini wrote:
>
> >> A possible use case is fuse fd passthrough being developed
> >> by Alessio Balsini [1] where underlying file system fd can be saved in
> >> this file store.
>
> oh, this could be quite what I'm currently intending do implement
> (just considered 9p instead of fuse as it looks simpler to me):
>
> I'd like the server being able to directly send an already opened fd to
> the client (in response to it calling open()), quite like we can send
> fd's via unix sockets.
>
> The primary use case of that is sending already prepared fd's (eg. an
> active network connection, locked-down file fd, a device that the client
> can't open himself, etc).
>
> Is that what you're working on ?
If the server and client run on the same kernel, then yes, the current
RFC supports your use case as well, E.g.,
1. the server opens a file, saves the FD to the kernel, and passes the
IDR to the client.
2. the client retrieves the FD from the kernel

Does it match your use case?

Cheers,
Tao

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