On Wed, Jun 15, 2016 at 02:52:24PM +0000, Trond Myklebust wrote: > >But XFS allows full parallelism for direct reads and writes as long > >as there is no more pagecache to flush. But if you have pages in > >the pagecache you need the exclusive lock to prevent against new > >pagecache pages being added. > > Exactly. So does this. So let's avoid bloating the inode with another rw_semaphore, and make everyones life easier by using the existing lock. > We don???t use generic_file_* for O_DIRECT; we only use it for buffered I/O. I know - this was just an answer to your reference to the generic_file_* code. -- To unsubscribe from this list: send the line "unsubscribe linux-nfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
