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Message-ID: <20181204202103.GD3903@fieldses.org>
Date: Tue, 4 Dec 2018 15:21:03 -0500
From: "J. Bruce Fields" <bfields@...ldses.org>
To: NeilBrown <neilb@...e.com>
Cc: Chuck Lever <chuck.lever@...cle.com>,
Jeff Layton <jlayton@...nel.org>,
Trond Myklebust <trond.myklebust@...merspace.com>,
Anna Schumaker <anna.schumaker@...app.com>,
Linux NFS Mailing List <linux-nfs@...r.kernel.org>,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH 00/23 - V5] NFS: Remove generic RPC credentials.
On Mon, Dec 03, 2018 at 11:30:30AM +1100, NeilBrown wrote:
> This is the same series as posted on 07 November, modified slightly
> to match some recent code changes upstream - nothing substantial.
>
> General description:
>
> There doesn't seem to be a maintainer for the 'cred' code, so I don't
> know who to ask to approve the first 4 patches. Maybe if the NFS
> team like them, they can just go to Linus with a note for him to look
> at them if he wants to.
For what it's worth: all my usual tests still pass with this series
applied. And the nfsd (and common) parts are unlikely to conflict with
anything of mine.
Otherwise: sounds like a reasonable idea, but I haven't gotten a chance
to review the patches in any detail.
--b.
>
> The original motivation for this was performance. In some
> circumstances the cred caches can get big and particularly can get
> long chains. The hash function has been changed at least once to
> improve the hashing and it still isn't perfect.
> Rather than improving pruning of the cache, or resizing the hashtable
> etc, it is easiest to just get rid of it.
>
> As well as discarding generic credentials completely (using 'struct
> cred' instead), we also stop storing AUTH_UNIX credentials in a hash
> table - that brings no value. Just allocate as needed and discard
> when finished with.
> So the only hash table will still have is for AUTH_GSS.
> One of the main triggers for hashtable problems was users changing
> groups a lot, so there would be many entries for the one user, each
> with a different set of groups. That doesn't apply for
> AUTH_GSS as the groupids on the client are ignored.
>
> That was the original motivation, but as I worked on it, I realized
> that it was making a log of code simpler.
>
> 44 files changed, 550 insertions(+), 925 deletions(-)
>
> That is sufficient motivation in itself I think.
>
> Thanks,
> NeilBrown
>
>
> ---
>
> NeilBrown (23):
> cred: add cred_fscmp() for comparing creds.
> cred: add get_cred_rcu()
> cred: export get_task_cred().
> cred: allow get_cred() and put_cred() to be given NULL.
> SUNRPC: add 'struct cred *' to auth_cred and rpc_cred
> SUNRPC: remove groupinfo from struct auth_cred.
> SUNRPC: remove uid and gid from struct auth_cred
> SUNRPC: remove machine_cred field from struct auth_cred
> NFSv4: add cl_root_cred for use when machine cred is not available.
> NFSv4: don't require lock for get_renew_cred or get_machine_cred
> SUNRPC: discard RPC_DO_ROOTOVERRIDE()
> NFS/SUNRPC: don't lookup machine credential until rpcauth_bindcred().
> SUNRPC: introduce RPC_TASK_NULLCREDS to request auth_none
> SUNRPC: add side channel to use non-generic cred for rpc call.
> NFS: move credential expiry tracking out of SUNRPC into NFS.
> SUNRPC: remove RPCAUTH_AUTH_NO_CRKEY_TIMEOUT
> NFS: change access cache to use 'struct cred'.
> NFS: struct nfs_open_dir_context: convert rpc_cred pointer to cred.
> NFS/NFSD/SUNRPC: replace generic creds with 'struct cred'.
> SUNRPC: remove generic cred code.
> SUNRPC: remove crbind rpc_cred operation
> SUNRPC: simplify auth_unix.
> SUNRPC discard cr_uid from struct rpc_cred.
>
>
> fs/lockd/clntproc.c | 6 -
> fs/nfs/blocklayout/blocklayout.c | 2
> fs/nfs/client.c | 9 -
> fs/nfs/delegation.c | 28 +--
> fs/nfs/delegation.h | 10 -
> fs/nfs/dir.c | 59 ++----
> fs/nfs/flexfilelayout/flexfilelayout.c | 64 +++---
> fs/nfs/flexfilelayout/flexfilelayout.h | 8 -
> fs/nfs/flexfilelayout/flexfilelayoutdev.c | 16 +-
> fs/nfs/inode.c | 13 +
> fs/nfs/internal.h | 8 -
> fs/nfs/nfs3proc.c | 4
> fs/nfs/nfs4_fs.h | 65 +++---
> fs/nfs/nfs4client.c | 4
> fs/nfs/nfs4proc.c | 150 +++++++--------
> fs/nfs/nfs4renewd.c | 9 -
> fs/nfs/nfs4session.c | 5
> fs/nfs/nfs4state.c | 129 ++++++-------
> fs/nfs/pagelist.c | 2
> fs/nfs/pnfs.c | 14 +
> fs/nfs/pnfs.h | 10 -
> fs/nfs/pnfs_dev.c | 4
> fs/nfs/pnfs_nfs.c | 2
> fs/nfs/proc.c | 2
> fs/nfs/unlink.c | 15 -
> fs/nfs/write.c | 24 ++
> fs/nfsd/nfs4callback.c | 31 +--
> fs/nfsd/state.h | 2
> include/linux/cred.h | 26 ++-
> include/linux/nfs_fs.h | 13 +
> include/linux/nfs_fs_sb.h | 2
> include/linux/nfs_xdr.h | 16 +-
> include/linux/sunrpc/auth.h | 51 -----
> include/linux/sunrpc/clnt.h | 1
> include/linux/sunrpc/sched.h | 6 -
> kernel/cred.c | 58 ++++++
> net/sunrpc/Makefile | 2
> net/sunrpc/auth.c | 116 ++++++-----
> net/sunrpc/auth_generic.c | 293 -----------------------------
> net/sunrpc/auth_gss/auth_gss.c | 47 +----
> net/sunrpc/auth_null.c | 4
> net/sunrpc/auth_unix.c | 110 +++--------
> net/sunrpc/clnt.c | 26 +--
> net/sunrpc/sched.c | 5
> 44 files changed, 551 insertions(+), 920 deletions(-)
> delete mode 100644 net/sunrpc/auth_generic.c
>
> --
> Signature
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