[PATCH 32/37] staging/lustre: use 64-bit times for exp_last_request_time

[Drokin, Oleg]

On Sep 23, 2015, at 3:13 PM, Arnd Bergmann wrote:

> The last request time is stored as an 'unsigned long', which is
> good enough until 2106, but it is then converted to 'long' in
> some places, which overflows in 2038.
> 
> This changes the type to time64_t to avoid those problems.

Hm…
All this code is actually only making sense on server and is unused otherwise,
so it's probably best to drop ping_evictor_start, ping_evictor_main, exp_expired,
class_disconnect_export_list (and two places where it's called from) functions
and exp_last_request_time field.
And with ping evictor gone, we should also drop ptlrpc_update_export_timer.

While clients do retain the request handling code (to process server-originated
requests like lock callbacks), they are not going to evict the servers because
the server have not talked to us in a while or anything of the sort.