[lustre-devel] [PATCH 09/28] staging/lustre/ptlrpc: Early Reply vs Reply MDunlink

[Oleg Drokin]

From: Vitaly Fertman <vitaly.fertman at seagate.com>

A race between unregister_reply & early reply.
When buffers are busy for the early transfer, they cannon be unlinked
by unregister_reply, so the RPC gets into UNREGISTERING state. The
coming reply_in_callback for the early RPC already has unlinked flag
set due to previous mdunlink attempt, but we handle it properly only
for UNILNK event, whereas this is PUT in this case.

Signed-off-by: Vitaly Fertman <vitaly.fertman at seagate.com>
Seagate-bug-id: MRP-3323
Reviewed-by: Alexey Leonidovich Lyashkov <alexey.lyashkov at seagate.com>
Reviewed-by: Andriy Skulysh <andriy.skulysh at seagate.com>
Tested-by: Parinay Vijayprakash Kondekar <parinay.kondekar at seagate.com>
Reviewed-on: http://review.whamcloud.com/18934
Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-7434
Reviewed-by: Chris Horn <hornc at cray.com>
Reviewed-by: Andreas Dilger <andreas.dilger at intel.com>
Signed-off-by: Oleg Drokin <green at linuxhacker.ru>
---
 drivers/staging/lustre/lustre/ptlrpc/events.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/staging/lustre/lustre/ptlrpc/events.c b/drivers/staging/lustre/lustre/ptlrpc/events.c
index a243342..b1ce725 100644
--- a/drivers/staging/lustre/lustre/ptlrpc/events.c
+++ b/drivers/staging/lustre/lustre/ptlrpc/events.c
@@ -137,7 +137,8 @@ void reply_in_callback(lnet_event_t *ev)
 
 		req->rq_early_count++; /* number received, client side */
 
-		if (req->rq_replied)   /* already got the real reply */
+		/* already got the real reply or buffers are already unlinked */
+		if (req->rq_replied || req->rq_reply_unlinked == 1)
 			goto out_wake;
 
 		req->rq_early = 1;
-- 
2.7.4