On Wed, Jun 15, 2016 at 02:36:04PM +0000, Trond Myklebust wrote: > On 6/15/16, 03:16, "Christoph Hellwig" <hch@xxxxxxxxxxxxx> wrote: > > >Explanation of why reads are more special than writes here or in > >general why they are safe? > > > > With the new locking, we already have exclusion between buffered I/O and direct I/O, and so the only remaining use case for inode_dio_wait() is to wait for writes to complete in operations like fsync(). There is no need to wait for pending dio in fsync - fsync is only guarantee to flush out I/O that's alreayd been completed. inode_dio_wait and friends were introduces to protect aio that doesn't hold i_mutex against truncate. -- 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
