Re: [PATCH 00/17] VFS: Filesystem information and notifications [ver #17]

On 3/3/20 12:02 PM, Jeff Layton wrote:

Basically, all you'd need to do is keep a pointer to struct file in the
internal state for the chain. Then, allow userland to specify some magic
fd value for subsequent chained operations that says to use that instead
of consulting the fdtable. Maybe use -4096 (-MAX_ERRNO - 1)?

BTW, I think we need two magics here. One that says "result from
previous is fd for next", and one that says "fd from previous is fd for
next". The former allows inheritance from open -> read, the latter from
read -> write.

-- 
Jens Axboe