staging/lustre/llite: force lvb_data update after layout change

When a file is restored the layout lock is first
associated with the released layout and after restore
it has to be assocaited with the new layout. This patch
forces lvb_data update in ll_layout_fetch() even if one
is present (case for released->normal state change)

Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-3299
Lustre-change: http://review.whamcloud.com/6291Signed-off-by: JC Lafoucriere <jacques-charles.lafoucriere@cea.fr>
Reviewed-by: Jinshan Xiong <jinshan.xiong@intel.com>
Reviewed-by: Johann Lombardi <johann.lombardi@intel.com>
Signed-off-by: Peng Tao <tao.peng@emc.com>
Signed-off-by: Andreas Dilger <andreas.dilger@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/lustre/lustre/llite/file.c

@@ -2941,7 +2941,11 @@ static int ll_layout_fetch(struct inode *inode, struct ldlm_lock *lock)
 	int rc;
 	ENTRY;
 
-	if (lock->l_lvb_data != NULL)
+	CDEBUG(D_INODE, DFID" LVB_READY=%d l_lvb_data=%p l_lvb_len=%d\n",
+	       PFID(ll_inode2fid(inode)), !!(lock->l_flags & LDLM_FL_LVB_READY),
+	       lock->l_lvb_data, lock->l_lvb_len);
+
+	if ((lock->l_lvb_data != NULL) && (lock->l_flags & LDLM_FL_LVB_READY))
 		RETURN(0);
 
 	/* if layout lock was granted right away, the layout is returned
@@ -2977,15 +2981,13 @@ static int ll_layout_fetch(struct inode *inode, struct ldlm_lock *lock)
 
 	memcpy(lvbdata, lmm, lmmsize);
 	lock_res_and_lock(lock);
-	if (lock->l_lvb_data == NULL) {
+	if (lock->l_lvb_data != NULL)
+		OBD_FREE_LARGE(lock->l_lvb_data, lock->l_lvb_len);
+
 	lock->l_lvb_data = lvbdata;
 	lock->l_lvb_len = lmmsize;
-		lvbdata = NULL;
-	}
 	unlock_res_and_lock(lock);
 
-	if (lvbdata != NULL)
-		OBD_FREE_LARGE(lvbdata, lmmsize);
 	EXIT;
 
 out: