I'm proposing this series for v6.2 (for-next). I intend to open this
branch soon, now that the v6.1 merge window is closed.

For quite some time, we've been encouraged to disable filecache
garbage collection for NFSv4 files, and I think I found a surgical
way to do just that. That is presented in "NFSD: Add an NFSD_FILE_GC
flag to enable nfsd_file garbage collection".

The other major change in this set is reworking the file_hashtbl to
resize itself dynamically. This reduces the average size of its
bucket chains, greatly speeding up hash insertion, which holds the
state_lock.

Comments and opinions are welcome.

Changes since v3:
- the new filehandle alias check was still not right

Changes since v2:
- Converted nfs4_file_rhashtbl to nfs4_file_rhltable
- Addressed most or all other review comments


Changes since RFC:
- checking nfs4_files for inode aliases is now done only on hash
insertion
- the nfs4_file reference count is now bumped only while the RCU
read lock is held
- comments and function names have been revised and clarified

---

Chuck Lever (7):
      NFSD: Pass the target nfsd_file to nfsd_commit()
      NFSD: Revert "NFSD: NFSv4 CLOSE should release an nfsd_file immediately"
      NFSD: Add an NFSD_FILE_GC flag to enable nfsd_file garbage collection
      NFSD: Use const pointers as parameters to fh_ helpers
      NFSD: Use rhashtable for managing nfs4_file objects
      NFSD: Clean up nfs4_preprocess_stateid_op() call sites
      NFSD: Trace delegation revocations


 fs/nfsd/filecache.c |  79 +++++++++++-----
 fs/nfsd/filecache.h |   4 +-
 fs/nfsd/nfs3proc.c  |  10 +-
 fs/nfsd/nfs4proc.c  |  42 ++++-----
 fs/nfsd/nfs4state.c | 221 ++++++++++++++++++++++++++++++--------------
 fs/nfsd/nfsfh.h     |  10 +-
 fs/nfsd/state.h     |   5 +-
 fs/nfsd/trace.h     |  58 +++++++++++-
 fs/nfsd/vfs.c       |  19 ++--
 fs/nfsd/vfs.h       |   3 +-
 10 files changed, 305 insertions(+), 146 deletions(-)

--
Chuck Lever