On 2010-12-17 01:07, Christoph Hellwig wrote: > On Thu, Dec 16, 2010 at 11:21:21AM -0500, Matt W. Benjamin wrote: >> Hi, >> >> We have a files implementation which wants to receive LAYOUTCOMMIT when a client is finished with a layout. It was my clear understanding from rfc5661 that we could expect this behavior. > > Care to post it to the list? > I don't know what Matt's server is doing but the fundamental problem is manifested with extending a file with parallel DS writes. Assuming that the DS writes are executed in arbitrary order, exposing the file length before LAYOUTCOMMIT can cause a concurrent reader to read a hole. Although locking can solve this case, day-to-day applications that work well over local filesystem and legacy NFS may break because of this. Benny -- 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
