1 files changed, 6 insertions, 0 deletions

diff --git a/fs/ext4/xattr.c b/fs/ext4/xattr.c
index 0ae3668520f8..93a00d89a220 100644
--- a/fs/ext4/xattr.c
+++ b/fs/ext4/xattr.c
@@ -820,8 +820,14 @@ inserted:
                         if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)))
                                 goal = goal & EXT4_MAX_BLOCK_FILE_PHYS;
 
+                        /*
+                         * take i_data_sem because we will test
+                         * i_delalloc_reserved_flag in ext4_mb_new_blocks
+                         */
+                        down_read((&EXT4_I(inode)->i_data_sem));
                         block = ext4_new_meta_blocks(handle, inode, goal, 0,
                                                      NULL, &error);
+                        up_read((&EXT4_I(inode)->i_data_sem));
                         if (error)
                                 goto cleanup;