1 files changed, 9 insertions, 3 deletions

diff --git a/fs/ocfs2/file.c b/fs/ocfs2/file.c
index 4979b6675717..566f9b70ec91 100644
--- a/fs/ocfs2/file.c
+++ b/fs/ocfs2/file.c
@@ -326,9 +326,6 @@ static int ocfs2_truncate_file(struct inode *inode,
                    (unsigned long long)OCFS2_I(inode)->ip_blkno,
                    (unsigned long long)new_i_size);
 
-        unmap_mapping_range(inode->i_mapping, new_i_size + PAGE_SIZE - 1, 0, 1);
-        truncate_inode_pages(inode->i_mapping, new_i_size);
-
         fe = (struct ocfs2_dinode *) di_bh->b_data;
         if (!OCFS2_IS_VALID_DINODE(fe)) {
                 OCFS2_RO_ON_INVALID_DINODE(inode->i_sb, fe);
@@ -363,16 +360,23 @@ static int ocfs2_truncate_file(struct inode *inode,
         if (new_i_size == le64_to_cpu(fe->i_size))
                 goto bail;
 
+        down_write(&OCFS2_I(inode)->ip_alloc_sem);
+
         /* This forces other nodes to sync and drop their pages. Do
          * this even if we have a truncate without allocation change -
          * ocfs2 cluster sizes can be much greater than page size, so
          * we have to truncate them anyway.  */
         status = ocfs2_data_lock(inode, 1);
         if (status < 0) {
+                up_write(&OCFS2_I(inode)->ip_alloc_sem);
+
                 mlog_errno(status);
                 goto bail;
         }
 
+        unmap_mapping_range(inode->i_mapping, new_i_size + PAGE_SIZE - 1, 0, 1);
+        truncate_inode_pages(inode->i_mapping, new_i_size);
+
         /* alright, we're going to need to do a full blown alloc size
          * change. Orphan the inode so that recovery can complete the
          * truncate if necessary. This does the task of marking
@@ -399,6 +403,8 @@ static int ocfs2_truncate_file(struct inode *inode,
 bail_unlock_data:
         ocfs2_data_unlock(inode, 1);
 
+        up_write(&OCFS2_I(inode)->ip_alloc_sem);
+
 bail:
 
         mlog_exit(status);