dbuf.patch

diff --git a/module/zfs/dbuf.c b/module/zfs/dbuf.c
index 9be69b5..1238fcd 100644
--- a/module/zfs/dbuf.c
+++ b/module/zfs/dbuf.c
@@ -1763,8 +1763,13 @@ dbuf_create(dnode_t *dn, uint8_t level, uint64_t blkid,
 
 	ASSERT(RW_LOCK_HELD(&dn->dn_struct_rwlock));
 	ASSERT(dn->dn_type != DMU_OT_NONE);
-
+#ifdef _KERNEL
+	printk_once("sizeof dbuf=%lu\n", sizeof (dmu_buf_impl_t));
+	db = (dmu_buf_impl_t *)__get_free_page(GFP_KERNEL);
+	dbuf_cons(db, NULL, 0);
+#else
 	db = kmem_cache_alloc(dbuf_cache, KM_SLEEP);
+#endif
 
 	db->db_objset = os;
 	db->db.db_object = dn->dn_object;
@@ -1814,7 +1819,12 @@ dbuf_create(dnode_t *dn, uint8_t level, uint64_t blkid,
 	db->db_state = DB_EVICTING;
 	if ((odb = dbuf_hash_insert(db)) != NULL) {
 		/* someone else inserted it first */
+#ifdef _KERNEL
+		dbuf_dest(db, NULL);
+		free_page((unsigned long)db);
+#else
 		kmem_cache_free(dbuf_cache, db);
+#endif
 		mutex_exit(&dn->dn_dbufs_mtx);
 		return (odb);
 	}
@@ -1900,8 +1910,12 @@ dbuf_destroy(dmu_buf_impl_t *db)
 	ASSERT(db->db_hash_next == NULL);
 	ASSERT(db->db_blkptr == NULL);
 	ASSERT(db->db_data_pending == NULL);
-
+#ifdef _KERNEL
+	dbuf_dest(db, NULL);
+	free_page((unsigned long)db);
+#else
 	kmem_cache_free(dbuf_cache, db);
+#endif
 	arc_space_return(sizeof (dmu_buf_impl_t), ARC_SPACE_OTHER);
 }