Branch HEAD

[fs/lustre-release.git] / lustre / osc / osc_io.c

diff --git a/lustre/osc/osc_io.c b/lustre/osc/osc_io.c
index 4b4ae0a..065c808 100644 (file)
--- a/lustre/osc/osc_io.c
+++ b/lustre/osc/osc_io.c
@@ -113,7 +113,8 @@ static void osc_io_unplug(const struct lu_env *env, struct osc_object *osc,
  */
 static int osc_io_submit(const struct lu_env *env,
                          const struct cl_io_slice *ios,
-                         enum cl_req_type crt, struct cl_2queue *queue)
+                         enum cl_req_type crt, struct cl_2queue *queue,
+                         enum cl_req_priority priority)
 {
         struct cl_page    *page;
         struct cl_page    *tmp;
@@ -148,6 +149,8 @@ static int osc_io_submit(const struct lu_env *env,
                 osc = cl2osc(opg->ops_cl.cpl_obj);
                 exp = osc_export(osc);
 
+                if (priority > CRP_NORMAL)
+                        oap->oap_async_flags |= ASYNC_HP;
                 /*
                  * This can be checked without cli->cl_loi_list_lock, because
                  * ->oap_*_item are always manipulated when the page is owned.
@@ -194,6 +197,19 @@ static int osc_io_submit(const struct lu_env *env,
                 /*
                  * Don't keep client_obd_list_lock() for too long.
                  *
+                 * XXX client_obd_list lock has to be unlocked periodically to
+                 * avoid soft-lockups that tend to happen otherwise (see bug
+                 * 16651). On the other hand, osc_io_submit_page() queues a
+                 * page with ASYNC_URGENT flag and so all pages queued up
+                 * until this point are sent out immediately by
+                 * osc_io_unplug() resulting in sub-optimal RPCs (sub-optimal
+                 * RPCs only happen during `warm up' phase when less than
+                 * cl_max_rpcs_in_flight RPCs are in flight). To balance these
+                 * conflicting requirements, one might unplug once enough
+                 * pages to form a large RPC were queued (i.e., use
+                 * cli->cl_max_pages_per_rpc as OSC_QUEUE_GRAIN, see
+                 * lop_makes_rpc()), or ignore soft-lockup issue altogether.
+                 *
                  * XXX lock_need_resched() should be used here, but it is not
                  * available in the older of supported kernels.
                  */
@@ -422,19 +438,23 @@ static int osc_io_trunc_start(const struct lu_env *env,
         struct osc_punch_cbargs *cbargs = &oio->oi_punch_cbarg;
         struct obd_capa         *capa;
         loff_t                   size   = io->u.ci_truncate.tr_size;
-        int                      result;
+        int                      result = 0;
+
 
         memset(oa, 0, sizeof(*oa));
 
         osc_trunc_check(env, io, oio, size);
 
-        cl_object_attr_lock(obj);
-        result = cl_object_attr_get(env, obj, attr);
-        if (result == 0) {
-                attr->cat_size = attr->cat_kms = size;
-                result = cl_object_attr_set(env, obj, attr, CAT_SIZE|CAT_KMS);
+        if (oio->oi_lockless == 0) {
+                cl_object_attr_lock(obj);
+                result = cl_object_attr_get(env, obj, attr);
+                if (result == 0) {
+                        attr->cat_size = attr->cat_kms = size;
+                        result = cl_object_attr_set(env, obj, attr,
+                                                    CAT_SIZE|CAT_KMS);
+                }
+                cl_object_attr_unlock(obj);
         }
-        cl_object_attr_unlock(obj);
 
         if (result == 0) {
                 oa->o_id = loi->loi_id;
@@ -602,19 +622,15 @@ static void osc_req_attr_set(const struct lu_env *env,
                 opg = osc_cl_page_osc(apage);
                 apage = opg->ops_cl.cpl_page; /* now apage is a sub-page */
                 lock = cl_lock_at_page(env, apage->cp_obj, apage, NULL, 1, 1);
-                if (lock != NULL) {
-                        olck = osc_lock_at(lock);
-                        LASSERT(olck != NULL);
-                        /* check for lockless io. */
-                        if (olck->ols_lock != NULL) {
-                                oa->o_handle = olck->ols_lock->l_remote_handle;
-                                oa->o_valid |= OBD_MD_FLHANDLE;
-                        }
-                        cl_lock_put(env, lock);
-                } else {
-                        /* Should only be possible with liblustre */
-                        LASSERT(LIBLUSTRE_CLIENT);
+                LASSERT(lock != NULL);
+                olck = osc_lock_at(lock);
+                LASSERT(olck != NULL);
+                /* check for lockless io. */
+                if (olck->ols_lock != NULL) {
+                        oa->o_handle = olck->ols_lock->l_remote_handle;
+                        oa->o_valid |= OBD_MD_FLHANDLE;
                 }
+                cl_lock_put(env, lock);
         }
 }
 
@@ -641,7 +657,7 @@ int osc_req_init(const struct lu_env *env, struct cl_device *dev,
         struct osc_req *or;
         int result;
 
-        OBD_SLAB_ALLOC_PTR(or, osc_req_kmem);
+        OBD_SLAB_ALLOC_PTR_GFP(or, osc_req_kmem, CFS_ALLOC_IO);
         if (or != NULL) {
                 cl_req_slice_add(req, &or->or_cl, dev, &osc_req_ops);
                 result = 0;