- */
-static struct lu_object *lu_object_find_try(const struct lu_env *env,
- struct lu_device *dev,
- const struct lu_fid *f,
- const struct lu_object_conf *conf,
- wait_queue_t *waiter)
-{
- struct lu_object *o;
- struct lu_object *shadow;
- struct lu_site *s;
- struct cfs_hash *hs;
- struct cfs_hash_bd bd;
- __u64 version = 0;
-
- /*
- * This uses standard index maintenance protocol:
- *
- * - search index under lock, and return object if found;
- * - otherwise, unlock index, allocate new object;
- * - lock index and search again;
- * - if nothing is found (usual case), insert newly created
- * object into index;
- * - otherwise (race: other thread inserted object), free
- * object just allocated.
- * - unlock index;
- * - return object.
- *
- * For "LOC_F_NEW" case, we are sure the object is new established.
- * It is unnecessary to perform lookup-alloc-lookup-insert, instead,
- * just alloc and insert directly.
- *
- * If dying object is found during index search, add @waiter to the
- * site wait-queue and return ERR_PTR(-EAGAIN).
- */
- if (conf != NULL && conf->loc_flags & LOC_F_NEW)
- return lu_object_new(env, dev, f, conf);
-
- s = dev->ld_site;
- hs = s->ls_obj_hash;
- cfs_hash_bd_get_and_lock(hs, (void *)f, &bd, 1);
- o = htable_lookup(s, &bd, f, waiter, &version);
- cfs_hash_bd_unlock(hs, &bd, 1);
- if (!IS_ERR(o) || PTR_ERR(o) != -ENOENT)
- return o;
-
- /*
- * Allocate new object. This may result in rather complicated
- * operations, including fld queries, inode loading, etc.
- */
- o = lu_object_alloc(env, dev, f, conf);
- if (unlikely(IS_ERR(o)))
- return o;
-
- LASSERT(lu_fid_eq(lu_object_fid(o), f));
-
- cfs_hash_bd_lock(hs, &bd, 1);
-
- shadow = htable_lookup(s, &bd, f, waiter, &version);
- if (likely(IS_ERR(shadow) && PTR_ERR(shadow) == -ENOENT)) {
- cfs_hash_bd_add_locked(hs, &bd, &o->lo_header->loh_hash);
- cfs_hash_bd_unlock(hs, &bd, 1);
-
- lu_object_limit(env, dev);
-
- return o;
- }
-
- lprocfs_counter_incr(s->ls_stats, LU_SS_CACHE_RACE);
- cfs_hash_bd_unlock(hs, &bd, 1);
- lu_object_free(env, o);
- return shadow;
-}
-
-/**