Hi, > I recently found that in EXT4 with delayed block the Ordered mode does not > bahave same as in EXT3. > I found a patch for this at http://lwn.net/Articles/324023/, but it has some > journal block estimation problem resulting into deadlock. > > I would like to know if it has been solved. > If not, is it possible to solve it? What are the complexities involved? It has not been solved. The problem is that to commit data on transaction commit (which is what data=ordered mode has historically done), you have to allocate space for these blocks. But that allocation needs to modify a filesystem and thus journal more blocks... And that is tricky - we would have to reserve space in the current transaction for allocation of delayed data. So it gets a bit messy... Why exactly do you need the old data=ordered guarantees? Honza -- Jan Kara <jack@xxxxxxx> SuSE CR Labs -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
