how to commit a directory entry to the disk

[tushar <tushu1232 gmail com>]

hey guys,

        well i am stuck up at a trivial point of committing the directory entry buffer to the disk
  
     i have intialised the values of struct ext3_dir_entry_2 *de and now want to commit it to the disk in the function

EXT3 FS----linux 2.6.18 ----/ext3/inode.c

static int ext33_do_update_inode(handle_t *handle, 
                struct inode *inode, 
                struct ext33_iloc *iloc)

{

--------------- raw inode updation------------------
dentry=list_entry(inode->i_dentry.next,struct dentry,d_alias);
bh1=ext33_find_entry(dentry,&de1);
---please tell me how to commit the de1 to the disk data structures after this point----------

}