1 files changed, 2 insertions, 2 deletions

diff --git a/fs/ext4/ioctl.c b/fs/ext4/ioctl.c
index e7f894bdb420..c0e5b8cf635c 100644
--- a/fs/ext4/ioctl.c
+++ b/fs/ext4/ioctl.c
@@ -199,7 +199,7 @@ flags_err:
                  * need to allocate reservation structure for this inode
                  * before set the window size
                  */
-                mutex_lock(&ei->truncate_mutex);
+                down_write(&ei->i_data_sem);
                 if (!ei->i_block_alloc_info)
                         ext4_init_block_alloc_info(inode);
 
@@ -207,7 +207,7 @@ flags_err:
                         struct ext4_reserve_window_node *rsv = &ei->i_block_alloc_info->rsv_window_node;
                         rsv->rsv_goal_size = rsv_window_size;
                 }
-                mutex_unlock(&ei->truncate_mutex);
+                up_write(&ei->i_data_sem);
                 return 0;
         }
         case EXT4_IOC_GROUP_EXTEND: {