[PATCH 10/19] staging: lustre: simplify waiting in ptlrpc_invalidate_import()

NeilBrown
2018-01-08T03:30:23Z

This waiter currently wakes up every second to re-test if
imp_flight is zero. If we ensure wakeup is called whenever
imp_flight is decremented to zero, we can just have a simple
wait_event_idle_timeout().

So add a wake_up_all to the one place it is missing, and simplify
the wait_event.

Signed-off-by: NeilBrown <neilb@suse.com>
---
drivers/staging/lustre/lustre/ptlrpc/client.c | 3 ++-
drivers/staging/lustre/lustre/ptlrpc/import.c | 21 ++++++++-------------
2 files changed, 10 insertions(+), 14 deletions(-)

diff --git a/drivers/staging/lustre/lustre/ptlrpc/client.c b/drivers/staging/lustre/lustre/ptlrpc/client.c
index 0ab13f8e5993..81b7a7046d82 100644
--- a/drivers/staging/lustre/lustre/ptlrpc/client.c
+++ b/drivers/staging/lustre/lustre/ptlrpc/client.c
@@ -1588,7 +1588,8 @@ static int ptlrpc_send_new_req(struct ptlrpc_request *req)
spin_lock(&imp->imp_lock);
if (!list_empty(&req->rq_list)) {
list_del_init(&req->rq_list);
- atomic_dec(&req->rq_import->imp_inflight);
+ if (atomic_dec_and_test(&req->rq_import->imp_inflight))
+ wake_up_all(&req->rq_import->imp_recovery_waitq);
}
spin_unlock(&imp->imp_lock);
ptlrpc_rqphase_move(req, RQ_PHASE_NEW);
diff --git a/drivers/staging/lustre/lustre/ptlrpc/import.c b/drivers/staging/lustre/lustre/ptlrpc/import.c
index ed210550f61f..5d62c9de27eb 100644
--- a/drivers/staging/lustre/lustre/ptlrpc/import.c
+++ b/drivers/staging/lustre/lustre/ptlrpc/import.c
@@ -265,7 +265,6 @@ void ptlrpc_invalidate_import(struct obd_import *imp)
{
struct list_head *tmp, *n;
struct ptlrpc_request *req;
- struct l_wait_info lwi;
unsigned int timeout;
int rc;

@@ -306,19 +305,15 @@ void ptlrpc_invalidate_import(struct obd_import *imp)
* callbacks. Cap it at obd_timeout -- these should all
* have been locally cancelled by ptlrpc_abort_inflight.
*/
- lwi = LWI_TIMEOUT_INTERVAL(
- cfs_timeout_cap(timeout * HZ),
- (timeout > 1) ? HZ :
- HZ / 2,
- NULL, NULL);
- rc = l_wait_event(imp->imp_recovery_waitq,
- (atomic_read(&imp->imp_inflight) == 0),
- &lwi);
- if (rc) {
+ rc = wait_event_idle_timeout(imp->imp_recovery_waitq,
+ atomic_read(&imp->imp_inflight) == 0,
+ obd_timeout * HZ);
+
+ if (rc == 0) {
const char *cli_tgt = obd2cli_tgt(imp->imp_obd);

- CERROR("%s: rc = %d waiting for callback (%d != 0)\n",
- cli_tgt, rc,
+ CERROR("%s: timeout waiting for callback (%d != 0)\n",
+ cli_tgt,
atomic_read(&imp->imp_inflight));

spin_lock(&imp->imp_lock);
@@ -365,7 +360,7 @@ void ptlrpc_invalidate_import(struct obd_import *imp)
}
spin_unlock(&imp->imp_lock);
}
- } while (rc != 0);
+ } while (rc == 0);

/*
* Let's additionally check that no new rpcs added to import in