On Sat, 2021-02-13 at 09:19 -0500, Steve Dickson wrote: > Hey! > > On 2/12/21 4:49 PM, trondmy@xxxxxxxxxx wrote: > > From: Trond Myklebust <trond.myklebust@xxxxxxxxxxxxxxx> > > > > The following patch series sets up a new mount option > > 'writes=lazy/eager/wait'. The mount option basically controls how > > the > > write() system call works. > > - writes=lazy is the default, and keeps the current behaviour > > - writes=eager means we send off the write immediately as an > > unstable > > write to the server. > > - writes=wait means we send off the write as an unstable write, and > > then > > wait for the reply. > > > > The main motivator for this behaviour is that some applications > > expect > > write() to return ENOSPC. Setting writes=wait should satisfy those > > applications without taking the full overhead of a synchronous > > write. > > > > writes=eager, on the other hand, can be useful for applications > > such as > > re-exporting NFS, since it would allow knfsd on the proxying server > > to > > immediately forward the writes to the original server. > > > > Trond Myklebust (3): > > NFS: 'flags' field should be unsigned in struct nfs_server > > NFS: Add support for eager writes > > NFS: Add mount options supporting eager writes > > > > fs/nfs/file.c | 19 +++++++++++++++++-- > > fs/nfs/fs_context.c | 33 +++++++++++++++++++++++++++++++++ > > fs/nfs/write.c | 17 ++++++++++++----- > > include/linux/nfs_fs_sb.h | 4 +++- > > 4 files changed, 65 insertions(+), 8 deletions(-) > > > Shouldn't something be added to the nfs(5) man page > as well as blurb added to /etc/nfsmount.conf file? > Sure, but I'd like comments/consensus on the kernel bits first. 🙂 Cheers Trond -- Trond Myklebust Linux NFS client maintainer, Hammerspace trond.myklebust@xxxxxxxxxxxxxxx
