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Subject: [PATCH RFC 0/8] Make NFSv4 OPEN(CREATE) less brittle
From:   Chuck Lever <chuck.lever@oracle.com>
To:     linux-nfs@vger.kernel.org, linux-fsdevel@vger.kernel.org
Date:   Wed, 20 Apr 2022 14:28:34 -0400
Message-ID: <165047903719.1829.18357114060053600197.stgit@manet.1015granger.net>
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Attempt to address occasional reports of test failures caused by
NFSv4 OPEN(CREATE) having failing internally after the target
file object has been created.

The basic approach is to re-organize the NFSv4 OPEN code path so
that common failure modes occur /before/ the call to vfs_create()
rather than afterwards. In addition, the file is opened and created
atomically so that another client can't race and de-permit the
file just after it was created but before the server has opened it.

So far I haven't found any regressions. However I have not been
able to reproduce the original failures.


---

Chuck Lever (8):
      NFSD: Clean up nfsd3_proc_create()
      NFSD: Avoid calling fh_drop_write() twice in do_nfsd_create()
      NFSD: Refactor nfsd_create_setattr()
      NFSD: Refactor NFSv3 CREATE
      NFSD: Refactor NFSv4 OPEN(CREATE)
      NFSD: Remove do_nfsd_create()
      NFSD: Clean up nfsd_open_verified()
      NFSD: Instantiate a struct file when creating a regular NFSv4 file


 fs/nfsd/filecache.c |  51 +++++++--
 fs/nfsd/filecache.h |   2 +
 fs/nfsd/nfs3proc.c  | 141 +++++++++++++++++++++----
 fs/nfsd/nfs4proc.c  | 197 +++++++++++++++++++++++++++++++++--
 fs/nfsd/nfs4state.c |  16 ++-
 fs/nfsd/vfs.c       | 245 ++++++++++----------------------------------
 fs/nfsd/vfs.h       |  14 +--
 fs/nfsd/xdr4.h      |   1 +
 fs/open.c           |  44 ++++++++
 include/linux/fs.h  |   2 +
 10 files changed, 471 insertions(+), 242 deletions(-)

--
Chuck Lever