ext4: Make fsync sync new parent directories in no-journal mode

Add a new ext4 state to tell us when a file has been newly created; use
that state in ext4_sync_file in no-journal mode to tell us when we need
to sync the parent directory as well as the inode and data itself.  This
fixes a problem in which a panic or power failure may lose the entire
file even when using fsync, since the parent directory entry is lost.

Addresses-Google-Bug: #2480057

Signed-off-by: Frank Mayhar <fmayhar@google.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

1 files changed, 2 insertions, 0 deletions

diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
index 83be743c8d1f..a43e6617b351 100644
--- a/fs/ext4/namei.c
+++ b/fs/ext4/namei.c
@@ -1517,6 +1517,8 @@ static int ext4_add_entry(handle_t *handle, struct dentry *dentry,
         de->rec_len = ext4_rec_len_to_disk(blocksize, blocksize);
         retval = add_dirent_to_buf(handle, dentry, inode, de, bh);
         brelse(bh);
+        if (retval == 0)
+                ext4_set_inode_state(inode, EXT4_STATE_NEWENTRY);
         return retval;
 }