[Ocfs2-devel] [PATCH 1/1] Ocfs2: __ocfs2_find_path() needs to treat hole correctly.

[Tristan Ye]

Currently, __ocfs2_find_path() was lack of a mechanism to detect
a hole between two extent blocks if the cpos we want to search is
within the hole, as a result, the last rec will be returned incorrectly.

This patch attempts to detect a hole, and return the rightmost
extent block preceding the hole.

Signed-off-by: Tristan Ye <tristan.ye at oracle.com>
---
 fs/ocfs2/alloc.c |   11 +++++++++++
 1 files changed, 11 insertions(+), 0 deletions(-)

diff --git a/fs/ocfs2/alloc.c b/fs/ocfs2/alloc.c
index 9f8bd91..2638a18 100644
--- a/fs/ocfs2/alloc.c
+++ b/fs/ocfs2/alloc.c
@@ -1841,6 +1841,17 @@ static int __ocfs2_find_path(struct ocfs2_caching_info *ci,
 				ocfs2_rec_clusters(el, rec);
 			if (cpos >= le32_to_cpu(rec->e_cpos) && cpos < range)
 			    break;
+
+			/*
+			 * Return the rightmost extent block leftly adjacent
+			 * to a hole if there is any between two extent blocks.
+			 *
+			 * Otherwise, we get the last rec of this block unexpectly.
+			 */
+			if (cpos < le32_to_cpu(rec->e_cpos)) {
+				i--;
+				break;
+			}
 		}
 
 		blkno = le64_to_cpu(el->l_recs[i].e_blkno);
-- 
1.5.5