LU-32 osd: keep root node BH ref of IAM container

[fs/lustre-release.git] / lustre / osd-ldiskfs / osd_iam.c

diff --git a/lustre/osd-ldiskfs/osd_iam.c b/lustre/osd-ldiskfs/osd_iam.c
index 7655f50..98cde18 100644 (file)
--- a/lustre/osd-ldiskfs/osd_iam.c
+++ b/lustre/osd-ldiskfs/osd_iam.c
@@ -116,7 +116,6 @@
 #include "osd_internal.h"
 
 #include "xattr.h"
-#include "iopen.h"
 #include "acl.h"
 
 /*
@@ -191,6 +190,8 @@ EXPORT_SYMBOL(iam_container_setup);
  */
 void iam_container_fini(struct iam_container *c)
 {
+        brelse(c->ic_root_bh);
+        c->ic_root_bh = NULL;
 }
 EXPORT_SYMBOL(iam_container_fini);
 
@@ -269,6 +270,18 @@ int iam_node_read(struct iam_container *c, iam_ptr_t ptr,
 {
         int result = 0;
 
+        /* NB: it can be called by iam_lfix_guess() which is still at
+         * very early stage, c->ic_root_bh and c->ic_descr->id_ops
+         * haven't been intialized yet.
+         * Also, we don't have this for IAM dir.
+         */
+        if (c->ic_root_bh != NULL &&
+            c->ic_descr->id_ops->id_root_ptr(c) == ptr) {
+                get_bh(c->ic_root_bh);
+                *bh = c->ic_root_bh;
+                return 0;
+        }
+
         *bh = ldiskfs_bread(h, c->ic_object, (int)ptr, 0, &result);
         if (*bh == NULL)
                 result = -EIO;