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staging: lustre: remove back_to_sleep() 

When 'back_to_sleep()' is passed as the 'timeout' function,
the effect is to wait indefinitely for the event, polling
once after the timeout.
If LWI_ON_SIGNAL_NOOP is given, then after the timeout
we allow fatal signals to interrupt the wait.

Make this more obvious in both places "back_to_sleep()" is
used but using two explicit sleeps.

The code in ptlrpcd_add_req() looks odd - why not just have one
wait_event_idle()?  However I believe this is a faithful
transformation of the existing code.

Reviewed-by: James Simmons <jsimmons@infradead.org>
Signed-off-by: NeilBrown <neilb@suse.com>
Reviewed-by: Patrick Farrell <paf@cray.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
NeilBrown 2018-02-13 10:47:59 +11:00 committed by Greg Kroah-Hartman
parent 4796293a7a
commit cac6e45735
3 changed files with 11 additions and 13 deletions
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4
drivers/staging/lustre/lustre/include/lustre_lib.h
View File

@ -140,10 +140,6 @@ void target_send_reply(struct ptlrpc_request *req, int rc, int fail_id);
* XXX nikita: some ptlrpc daemon threads have races of that sort.
*
*/
static inline int back_to_sleep(void *arg)
{
return 0;
}
#define LWI_ON_SIGNAL_NOOP ((void (*)(void *))(-1))

11
drivers/staging/lustre/lustre/ptlrpc/import.c
View File

@ -1496,7 +1496,6 @@ int ptlrpc_disconnect_import(struct obd_import *imp, int noclose)
}
if (ptlrpc_import_in_recovery(imp)) {
struct l_wait_info lwi;
long timeout;
if (AT_OFF) {
@ -1510,10 +1509,12 @@ int ptlrpc_disconnect_import(struct obd_import *imp, int noclose)
timeout = at_get(&imp->imp_at.iat_service_estimate[idx]) * HZ;
}
lwi = LWI_TIMEOUT_INTR(cfs_timeout_cap(timeout),
back_to_sleep, LWI_ON_SIGNAL_NOOP, NULL);
rc = l_wait_event(imp->imp_recovery_waitq,
!ptlrpc_import_in_recovery(imp), &lwi);
if (wait_event_idle_timeout(imp->imp_recovery_waitq,
!ptlrpc_import_in_recovery(imp),
cfs_timeout_cap(timeout)) == 0)
l_wait_event_abortable(
imp->imp_recovery_waitq,
!ptlrpc_import_in_recovery(imp));
}
spin_lock(&imp->imp_lock);

9
drivers/staging/lustre/lustre/ptlrpc/ptlrpcd.c
View File

@ -230,12 +230,13 @@ void ptlrpcd_add_req(struct ptlrpc_request *req)
spin_lock(&req->rq_lock);
if (req->rq_invalid_rqset) {
struct l_wait_info lwi = LWI_TIMEOUT(5 * HZ,
back_to_sleep, NULL);
req->rq_invalid_rqset = 0;
spin_unlock(&req->rq_lock);
l_wait_event(req->rq_set_waitq, !req->rq_set, &lwi);
if (wait_event_idle_timeout(req->rq_set_waitq,
!req->rq_set,
5 * HZ) == 0)
wait_event_idle(req->rq_set_waitq,
!req->rq_set);
} else if (req->rq_set) {
/* If we have a valid "rq_set", just reuse it to avoid double
* linked.