staging: lustre: osc: Allow lock to be canceled at ENQ time

A cl_lock can be canceled when it's in CLS_ENQUEUED state.
We can't unuse this kind of lock in lov_lock_unuse() because
it will bring this lock into CLS_NEW state and then confuse
osc_lock_upcall().

Add a regression test case by Alexander Boyko.

Signed-off-by: Jinshan Xiong <jinshan.xiong@intel.com>
Signed-off-by: Alexander Boyko <alexander_boyko@xyratex.com>
Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-3889
Reviewed-on: http://review.whamcloud.com/8405
Reviewed-by: Bobi Jam <bobijam@gmail.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>
Signed-off-by: James Simmons <jsimmons@infradead.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/lustre/lustre/include/obd_support.h b/drivers/staging/lustre/lustre/include/obd_support.h
index 1358af1..60034d3 100644 (file)
--- a/drivers/staging/lustre/lustre/include/obd_support.h
+++ b/drivers/staging/lustre/lustre/include/obd_support.h
@@ -321,6 +321,7 @@ extern char obd_jobid_var[];
 #define OBD_FAIL_LDLM_AGL_DELAY          0x31a
 #define OBD_FAIL_LDLM_AGL_NOLOCK        0x31b
 #define OBD_FAIL_LDLM_OST_LVB           0x31c
+#define OBD_FAIL_LDLM_ENQUEUE_HANG      0x31d
 
 /* LOCKLESS IO */
 #define OBD_FAIL_LDLM_SET_CONTENTION     0x385

diff --git a/drivers/staging/lustre/lustre/osc/osc_request.c b/drivers/staging/lustre/lustre/osc/osc_request.c
index df06f4f..47417f8 100644 (file)
--- a/drivers/staging/lustre/lustre/osc/osc_request.c
+++ b/drivers/staging/lustre/lustre/osc/osc_request.c
@@ -2201,6 +2201,9 @@ static int osc_enqueue_interpret(const struct lu_env *env,
         */
        ldlm_lock_addref(lockh, mode);
 
+       /* Let cl_lock_state_wait fail with -ERESTARTSYS to unuse sublocks. */
+       OBD_FAIL_TIMEOUT(OBD_FAIL_LDLM_ENQUEUE_HANG, 2);
+
        /* Let CP AST to grant the lock first. */
        OBD_FAIL_TIMEOUT(OBD_FAIL_OSC_CP_ENQ_RACE, 1);