On Wed, Jan 08, 2014 at 02:17:13AM +0100, Jan Kara wrote: > Well, I was specifically worried about i_mutex locking. In particular: > Before we report appending IO completion we need to update i_size. > To update i_size we need to grab i_mutex. > > Now this is unpleasant because inode_dio_wait() happens under i_mutex so > the above would create lock inversion. And we cannot really do > inode_dio_done() before grabbing i_mutex as that would open interesting > races between truncate decreasing i_size and DIO increasing it.
Yeah, XFS splits this between the ilock and iolock, which just makes life in this area a whole lot easier. -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
