1 files changed, 2 insertions, 0 deletions

diff --git a/fs/ocfs2/inode.c b/fs/ocfs2/inode.c
index 21a605079c62..58ec54b60038 100644
--- a/fs/ocfs2/inode.c
+++ b/fs/ocfs2/inode.c
@@ -1106,8 +1106,10 @@ struct buffer_head *ocfs2_bread(struct inode *inode,
                 return NULL;
         }
 
+        down_read(&OCFS2_I(inode)->ip_alloc_sem);
         tmperr = ocfs2_extent_map_get_blocks(inode, block, &p_blkno, NULL,
                                              NULL);
+        up_read(&OCFS2_I(inode)->ip_alloc_sem);
         if (tmperr < 0) {
                 mlog_errno(tmperr);
                 goto fail;