linux-kernel - [PATCH 17/20] staging/lustre/llite: Add exception entry check after radix

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Date:	Sun,  1 Feb 2015 21:52:16 -0500
From:	green@...uxhacker.ru
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	devel@...verdev.osuosl.org,
	Andreas Dilger <andreas.dilger@...el.com>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Yang Sheng <yang.sheng@...el.com>,
	Oleg Drokin <oleg.drokin@...el.com>
Subject: [PATCH 17/20] staging/lustre/llite: Add exception entry check after radix_tree

From: Yang Sheng <yang.sheng@...el.com>

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

Signed-off-by: Yang Sheng <yang.sheng@...el.com>
Signed-off-by: Oleg Drokin <oleg.drokin@...el.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@...el.com>
Reviewed-by: James Simmons <uja.ornl@...il.com>
---
 drivers/staging/lustre/lustre/llite/dir.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/staging/lustre/lustre/llite/dir.c b/drivers/staging/lustre/lustre/llite/dir.c
index babba60..69a4a63 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);
-- 
2.1.0

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