On 2011-05-10 13:23, Weston Andros Adamson wrote:
>>From Section 8.4.2.1 of the rfc 5661 - We can determine if a RECLAIM_REBOOT
> can be skipped if the "eir_server_scope" from the exchange_id proc differs from
> previous calls.
>
> Also, in the future server_scope will be useful for determining whether client
> trunking is available
>
> Signed-off-by: Weston Andros Adamson <dros@xxxxxxxxxx>
> ---
>
> Applied comments from Benny. Also, I added a dprintk when server_scope mismatch
> is detected.
ACK, thanks!
Benny
>
>
> fs/nfs/client.c | 1 +
> fs/nfs/nfs4_fs.h | 2 ++
> fs/nfs/nfs4proc.c | 32 ++++++++++++++++++++++++++++++++
> fs/nfs/nfs4state.c | 9 ++++++++-
> fs/nfs/nfs4xdr.c | 8 +++++++-
> include/linux/nfs_fs_sb.h | 3 +++
> include/linux/nfs_xdr.h | 1 +
> 7 files changed, 54 insertions(+), 2 deletions(-)
>
> diff --git a/fs/nfs/client.c b/fs/nfs/client.c
> index 139be96..ba96834 100644
> --- a/fs/nfs/client.c
> +++ b/fs/nfs/client.c
> @@ -291,6 +291,7 @@ static void nfs_free_client(struct nfs_client *clp)
> put_rpccred(clp->cl_machine_cred);
>
> kfree(clp->cl_hostname);
> + kfree(clp->server_scope);
> kfree(clp);
>
> dprintk("<-- nfs_free_client()\n");
> diff --git a/fs/nfs/nfs4_fs.h b/fs/nfs/nfs4_fs.h
> index c4a6983..bfde1c1 100644
> --- a/fs/nfs/nfs4_fs.h
> +++ b/fs/nfs/nfs4_fs.h
> @@ -48,6 +48,7 @@ enum nfs4_client_state {
> NFS4CLNT_SESSION_RESET,
> NFS4CLNT_RECALL_SLOT,
> NFS4CLNT_LEASE_CONFIRM,
> + NFS4CLNT_SERVER_SCOPE_MISMATCH,
> };
>
> enum nfs4_session_state {
> @@ -349,6 +350,7 @@ extern void nfs4_schedule_state_manager(struct nfs_client *);
> extern void nfs4_schedule_stateid_recovery(const struct nfs_server *, struct nfs4_state *);
> extern void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags);
> extern void nfs41_handle_recall_slot(struct nfs_client *clp);
> +extern void nfs41_handle_server_scope(struct nfs_client *, struct server_scope **);
> extern void nfs4_put_lock_state(struct nfs4_lock_state *lsp);
> extern int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl);
> extern void nfs4_copy_stateid(nfs4_stateid *, struct nfs4_state *, fl_owner_t, pid_t);
> diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
> index 69c0f3c..455e7f8 100644
> --- a/fs/nfs/nfs4proc.c
> +++ b/fs/nfs/nfs4proc.c
> @@ -4751,6 +4751,16 @@ out_inval:
> return -NFS4ERR_INVAL;
> }
>
> +static bool
> +nfs41_same_server_scope(struct server_scope *a, struct server_scope *b)
> +{
> + if (a->server_scope_sz == b->server_scope_sz &&
> + memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0)
> + return true;
> +
> + return false;
> +}
> +
> /*
> * nfs4_proc_exchange_id()
> *
> @@ -4793,9 +4803,31 @@ int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
> init_utsname()->domainname,
> clp->cl_rpcclient->cl_auth->au_flavor);
>
> + res.server_scope = kzalloc(sizeof(struct server_scope), GFP_KERNEL);
> + if (unlikely(!res.server_scope))
> + return -ENOMEM;
> +
> status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
> if (!status)
> status = nfs4_check_cl_exchange_flags(clp->cl_exchange_flags);
> +
> + if (!status) {
> + if (clp->server_scope &&
> + !nfs41_same_server_scope(clp->server_scope,
> + res.server_scope)) {
> + dprintk("%s: server_scope mismatch detected\n",
> + __func__);
> + set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
> + kfree(clp->server_scope);
> + clp->server_scope = NULL;
> + }
> +
> + if (!clp->server_scope)
> + clp->server_scope = res.server_scope;
> + else
> + kfree(res.server_scope);
> + }
> +
> dprintk("<-- %s status= %d\n", __func__, status);
> return status;
> }
> diff --git a/fs/nfs/nfs4state.c b/fs/nfs/nfs4state.c
> index 036f5ad..4138453 100644
> --- a/fs/nfs/nfs4state.c
> +++ b/fs/nfs/nfs4state.c
> @@ -1639,7 +1639,14 @@ static void nfs4_state_manager(struct nfs_client *clp)
> goto out_error;
> }
> clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
> - set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
> +
> + if (test_and_clear_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH,
> + &clp->cl_state))
> + nfs4_state_start_reclaim_nograce(clp);
> + else
> + set_bit(NFS4CLNT_RECLAIM_REBOOT,
> + &clp->cl_state);
> +
> pnfs_destroy_all_layouts(clp);
> }
>
> diff --git a/fs/nfs/nfs4xdr.c b/fs/nfs/nfs4xdr.c
> index c3ccd2c..09a19ca 100644
> --- a/fs/nfs/nfs4xdr.c
> +++ b/fs/nfs/nfs4xdr.c
> @@ -4909,11 +4909,17 @@ static int decode_exchange_id(struct xdr_stream *xdr,
> if (unlikely(status))
> return status;
>
> - /* Throw away server_scope */
> + /* Save server_scope */
> status = decode_opaque_inline(xdr, &dummy, &dummy_str);
> if (unlikely(status))
> return status;
>
> + if (unlikely(dummy > NFS4_OPAQUE_LIMIT))
> + return -EIO;
> +
> + memcpy(res->server_scope->server_scope, dummy_str, dummy);
> + res->server_scope->server_scope_sz = dummy;
> +
> /* Throw away Implementation id array */
> status = decode_opaque_inline(xdr, &dummy, &dummy_str);
> if (unlikely(status))
> diff --git a/include/linux/nfs_fs_sb.h b/include/linux/nfs_fs_sb.h
> index 87694ca..f23b188 100644
> --- a/include/linux/nfs_fs_sb.h
> +++ b/include/linux/nfs_fs_sb.h
> @@ -16,6 +16,7 @@ struct nfs4_sequence_args;
> struct nfs4_sequence_res;
> struct nfs_server;
> struct nfs4_minor_version_ops;
> +struct server_scope;
>
> /*
> * The nfs_client identifies our client state to the server.
> @@ -83,6 +84,8 @@ struct nfs_client {
> #ifdef CONFIG_NFS_FSCACHE
> struct fscache_cookie *fscache; /* client index cache cookie */
> #endif
> +
> + struct server_scope *server_scope; /* from exchange_id */
> };
>
> /*
> diff --git a/include/linux/nfs_xdr.h b/include/linux/nfs_xdr.h
> index 890dce2..31d6df4 100644
> --- a/include/linux/nfs_xdr.h
> +++ b/include/linux/nfs_xdr.h
> @@ -1039,6 +1039,7 @@ struct server_scope {
> struct nfs41_exchange_id_res {
> struct nfs_client *client;
> u32 flags;
> + struct server_scope *server_scope;
> };
>
> struct nfs41_create_session_args {
--
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