On Mon, 4 Feb 2019, Ira Weiny wrote: > On Mon, Feb 04, 2019 at 05:14:19PM +0000, Christopher Lameter wrote: > > Frankly I still think this does not solve anything. > > > > Concurrent write access from two sources to a single page is simply wrong. > > You cannot make this right by allowing long term RDMA pins in a filesystem > > and thus the filesystem can never update part of its files on disk. > > > > Can we just disable RDMA to regular filesystems? Regular filesystems > > should have full control of the write back and dirty status of their > > pages. > > That may be a solution to the corruption/crashes but it is not a solution which > users want to see. RDMA directly to file systems (specifically DAX) is a use > case we have seen customers ask for. DAX is a special file system that does not use writeback for the DAX mappings. Thus it could be an exception. And the pages are already pinned.
