From: Trond Myklebust <trond.myklebust@xxxxxxxxxxxxxxx>
When re-exporting a NFSv4.x filesystem through knfsd, we want to ensure
that the individual knfsd threads don't get stuck waiting for the server
in a NFS4ERR_DELAY loop. While it may make sense to have the re-exported
client retry a few times, particularly when the clients are using NFSv3,
ultimately we want to just punt a EAGAIN back to knfsd, so that it can
return NFS4ERR_DELAY/NFS3ERR_JUKEBOX, and free up the thread.
With that in mind, add a client module parameter, 'delay_retrans', that
specifies how many times a 'softerr' mounted NFSv4 filesystem should
retry before returning EAGAIN.
In order to avoid disrupting existing setups, the feature is disabled by
default, however it can be enabled by specifying a positive value for
the new parameter.
Trond Myklebust (2):
NFSv4: Add a parameter to limit the number of retries after
NFS4ERR_DELAY
NFSv4/pnfs: Allow layoutget to return EAGAIN for softerr mounts
.../admin-guide/kernel-parameters.txt | 7 +++
fs/nfs/nfs4_fs.h | 2 +
fs/nfs/nfs4proc.c | 43 +++++++++++++++----
fs/nfs/pnfs.c | 8 +++-
fs/nfs/pnfs.h | 5 ++-
fs/nfs/super.c | 8 +++-
fs/nfs/write.c | 2 +
7 files changed, 63 insertions(+), 12 deletions(-)
--
2.41.0
