On Wed, Jun 9, 2021 at 11:16 PM Enrico Weigelt, metux IT consult
[off-list ref] wrote:

On 08.06.21 14:41, Peng Tao wrote:

Hi,

Hi,

quoted

The initial RFC mail in the thread has a userspace example code. Does
it make sense to you?

Sorry, I had missed that, now found it.

There're some things I don't quite understand:

* it just stores fd's I don't see anything where it is actually returned
   to some open() operation.

The FUSE_DEV_IOC_RESTORE_FD ioctl returns the opened fd to a different process.

* the store is machine wide global - everybody uses the same number
   space, dont see any kind of access conrol ... how about security ?

The idea is that anyone capable of opening /dev/fuse can retrieve the FD.

I don't believe that just storing the fd's somewhere is really helpful
for that purpose - the fuse server shall be able to reply the open()
request with an fd, which then is directly transferred to the client.

Could you describe your use case a bit? How does your client talk to
your server? Through open syscall or through some process-to-process
RPC calls?

Cheers,
Tao
-- 
Into Sth. Rich & Strange