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? steved.
