LU-365 Update copyright for files modified by Whamcloud

[fs/lustre-release.git] / lustre / osc / osc_cl_internal.h

diff --git a/lustre/osc/osc_cl_internal.h b/lustre/osc/osc_cl_internal.h
index b8e56eb..6478c26 100644 (file)
--- a/lustre/osc/osc_cl_internal.h
+++ b/lustre/osc/osc_cl_internal.h
@@ -26,7 +26,7 @@
  * GPL HEADER END
  */
 /*
- * Copyright  2008 Sun Microsystems, Inc. All rights reserved
+ * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
  * Use is subject to license terms.
  */
 /*
@@ -196,6 +196,17 @@ struct osc_lock {
         struct lustre_handle     ols_handle;
         struct ldlm_enqueue_info ols_einfo;
         enum osc_lock_state      ols_state;
+
+        /**
+         * How many pages are using this lock for io, currently only used by
+         * read-ahead. If non-zero, the underlying dlm lock won't be cancelled
+         * during recovery to avoid deadlock. see bz16774.
+         *
+         * \see osc_page::ops_lock
+         * \see osc_page_addref_lock(), osc_page_putref_lock()
+         */
+        cfs_atomic_t             ols_pageref;
+
         /**
          * true, if ldlm_lock_addref() was called against
          * osc_lock::ols_lock. This is used for sanity checking.
@@ -301,6 +312,16 @@ struct osc_page {
          * Submit time - the time when the page is starting RPC. For debugging.
          */
         cfs_time_t            ops_submit_time;
+
+        /**
+         * A lock of which we hold a reference covers this page. Only used by
+         * read-ahead: for a readahead page, we hold it's covering lock to
+         * prevent it from being canceled during recovery.
+         *
+         * \see osc_lock::ols_pageref
+         * \see osc_page_addref_lock(), osc_page_putref_lock().
+         */
+        struct cl_lock       *ops_lock;
 };
 
 extern cfs_mem_cache_t *osc_page_kmem;