From: Yang Sheng <yang.sheng@intel.com>
Date: Mon, 2 Feb 2015 02:52:16 +0000 (-0500)
Subject: staging/lustre/llite: Add exception entry check after radix_tree
X-Git-Tag: firefly_0821_release~176^2~2320^2~14
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=437dfb201a55ff73954ae7455ef3d17be4b1c0f6;p=firefly-linux-kernel-4.4.55.git

staging/lustre/llite: Add exception entry check after radix_tree

We need to check for an exception entry after radix_tree lookup.

Signed-off-by: Yang Sheng <yang.sheng@intel.com>
Signed-off-by: Oleg Drokin <oleg.drokin@intel.com>
Reviewed-on: http://review.whamcloud.com/10709
Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-5162
Reviewed-by: Bob Glossman <bob.glossman@intel.com>
Reviewed-by: James Simmons <uja.ornl@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/staging/lustre/lustre/llite/dir.c b/drivers/staging/lustre/lustre/llite/dir.c
index babba60a88bf..69a4a63e1d8f 100644
--- a/drivers/staging/lustre/lustre/llite/dir.c
+++ b/drivers/staging/lustre/lustre/llite/dir.c
@@ -278,7 +278,7 @@ static struct page *ll_dir_page_locate(struct inode *dir, __u64 *hash,
 	spin_lock_irq(&mapping->tree_lock);
 	found = radix_tree_gang_lookup(&mapping->page_tree,
 				       (void **)&page, offset, 1);
-	if (found > 0) {
+	if (found > 0 && !radix_tree_exceptional_entry(page)) {
 		struct lu_dirpage *dp;
 
 		page_cache_get(page);