ext4: Call ext4_jbd2_file_inode() after zeroing block

In data=ordered mode we should call ext4_jbd2_file_inode() so that crash
after the truncate transaction has committed does not expose stall data
in the tail of the block.

Thanks Jan Kara for pointing that out.

Signed-off-by: Lukas Czerner <lczerner@redhat.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>

1 files changed, 4 insertions, 1 deletions

diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 9b3380327ae2..e3d0fb9e78c4 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -3681,8 +3681,11 @@ int ext4_block_zero_page_range(handle_t *handle,
         err = 0;
         if (ext4_should_journal_data(inode)) {
                 err = ext4_handle_dirty_metadata(handle, inode, bh);
-        } else
+        } else {
                 mark_buffer_dirty(bh);
+                if (ext4_test_inode_state(inode, EXT4_STATE_ORDERED_MODE))
+                        err = ext4_jbd2_file_inode(handle, inode);
+        }
 
 unlock:
         unlock_page(page);