2468 lines
64 KiB
C
2468 lines
64 KiB
C
/*
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* fs/nfs/nfs4state.c
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*
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* Client-side XDR for NFSv4.
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*
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* Copyright (c) 2002 The Regents of the University of Michigan.
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* All rights reserved.
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*
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* Kendrick Smith <kmsmith@umich.edu>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
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* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* Implementation of the NFSv4 state model. For the time being,
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* this is minimal, but will be made much more complex in a
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* subsequent patch.
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*/
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/fs.h>
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#include <linux/nfs_fs.h>
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#include <linux/kthread.h>
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#include <linux/module.h>
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#include <linux/random.h>
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#include <linux/ratelimit.h>
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#include <linux/workqueue.h>
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#include <linux/bitops.h>
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#include <linux/jiffies.h>
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#include <linux/sunrpc/clnt.h>
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#include "nfs4_fs.h"
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#include "callback.h"
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#include "delegation.h"
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#include "internal.h"
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#include "nfs4idmap.h"
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#include "nfs4session.h"
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#include "pnfs.h"
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#include "netns.h"
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#define NFSDBG_FACILITY NFSDBG_STATE
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#define OPENOWNER_POOL_SIZE 8
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const nfs4_stateid zero_stateid = {
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{ .data = { 0 } },
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.type = NFS4_SPECIAL_STATEID_TYPE,
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};
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static DEFINE_MUTEX(nfs_clid_init_mutex);
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int nfs4_init_clientid(struct nfs_client *clp, struct rpc_cred *cred)
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{
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struct nfs4_setclientid_res clid = {
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.clientid = clp->cl_clientid,
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.confirm = clp->cl_confirm,
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};
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unsigned short port;
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int status;
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struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
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if (test_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state))
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goto do_confirm;
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port = nn->nfs_callback_tcpport;
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if (clp->cl_addr.ss_family == AF_INET6)
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port = nn->nfs_callback_tcpport6;
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status = nfs4_proc_setclientid(clp, NFS4_CALLBACK, port, cred, &clid);
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if (status != 0)
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goto out;
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clp->cl_clientid = clid.clientid;
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clp->cl_confirm = clid.confirm;
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set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
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do_confirm:
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status = nfs4_proc_setclientid_confirm(clp, &clid, cred);
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if (status != 0)
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goto out;
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clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
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nfs4_schedule_state_renewal(clp);
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out:
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return status;
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}
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/**
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* nfs40_discover_server_trunking - Detect server IP address trunking (mv0)
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*
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* @clp: nfs_client under test
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* @result: OUT: found nfs_client, or clp
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* @cred: credential to use for trunking test
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*
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* Returns zero, a negative errno, or a negative NFS4ERR status.
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* If zero is returned, an nfs_client pointer is planted in
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* "result".
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*
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* Note: The returned client may not yet be marked ready.
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*/
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int nfs40_discover_server_trunking(struct nfs_client *clp,
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struct nfs_client **result,
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struct rpc_cred *cred)
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{
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struct nfs4_setclientid_res clid = {
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.clientid = clp->cl_clientid,
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.confirm = clp->cl_confirm,
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};
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struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
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unsigned short port;
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int status;
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port = nn->nfs_callback_tcpport;
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if (clp->cl_addr.ss_family == AF_INET6)
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port = nn->nfs_callback_tcpport6;
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status = nfs4_proc_setclientid(clp, NFS4_CALLBACK, port, cred, &clid);
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if (status != 0)
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goto out;
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clp->cl_clientid = clid.clientid;
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clp->cl_confirm = clid.confirm;
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status = nfs40_walk_client_list(clp, result, cred);
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if (status == 0) {
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/* Sustain the lease, even if it's empty. If the clientid4
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* goes stale it's of no use for trunking discovery. */
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nfs4_schedule_state_renewal(*result);
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}
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out:
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return status;
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}
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struct rpc_cred *nfs4_get_machine_cred_locked(struct nfs_client *clp)
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{
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struct rpc_cred *cred = NULL;
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if (clp->cl_machine_cred != NULL)
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cred = get_rpccred(clp->cl_machine_cred);
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return cred;
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}
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static void nfs4_root_machine_cred(struct nfs_client *clp)
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{
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struct rpc_cred *cred, *new;
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new = rpc_lookup_machine_cred(NULL);
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spin_lock(&clp->cl_lock);
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cred = clp->cl_machine_cred;
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clp->cl_machine_cred = new;
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spin_unlock(&clp->cl_lock);
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if (cred != NULL)
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put_rpccred(cred);
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}
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static struct rpc_cred *
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nfs4_get_renew_cred_server_locked(struct nfs_server *server)
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{
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struct rpc_cred *cred = NULL;
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struct nfs4_state_owner *sp;
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struct rb_node *pos;
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for (pos = rb_first(&server->state_owners);
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pos != NULL;
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pos = rb_next(pos)) {
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sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
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if (list_empty(&sp->so_states))
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continue;
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cred = get_rpccred(sp->so_cred);
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break;
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}
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return cred;
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}
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/**
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* nfs4_get_renew_cred_locked - Acquire credential for a renew operation
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* @clp: client state handle
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*
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* Returns an rpc_cred with reference count bumped, or NULL.
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* Caller must hold clp->cl_lock.
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*/
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struct rpc_cred *nfs4_get_renew_cred_locked(struct nfs_client *clp)
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{
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struct rpc_cred *cred = NULL;
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struct nfs_server *server;
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/* Use machine credentials if available */
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cred = nfs4_get_machine_cred_locked(clp);
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if (cred != NULL)
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goto out;
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rcu_read_lock();
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list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
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cred = nfs4_get_renew_cred_server_locked(server);
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if (cred != NULL)
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break;
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}
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rcu_read_unlock();
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out:
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return cred;
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}
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static void nfs4_end_drain_slot_table(struct nfs4_slot_table *tbl)
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{
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if (test_and_clear_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state)) {
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spin_lock(&tbl->slot_tbl_lock);
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nfs41_wake_slot_table(tbl);
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spin_unlock(&tbl->slot_tbl_lock);
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}
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}
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static void nfs4_end_drain_session(struct nfs_client *clp)
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{
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struct nfs4_session *ses = clp->cl_session;
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if (clp->cl_slot_tbl) {
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nfs4_end_drain_slot_table(clp->cl_slot_tbl);
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return;
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}
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if (ses != NULL) {
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nfs4_end_drain_slot_table(&ses->bc_slot_table);
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nfs4_end_drain_slot_table(&ses->fc_slot_table);
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}
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}
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static int nfs4_drain_slot_tbl(struct nfs4_slot_table *tbl)
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{
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set_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state);
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spin_lock(&tbl->slot_tbl_lock);
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if (tbl->highest_used_slotid != NFS4_NO_SLOT) {
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reinit_completion(&tbl->complete);
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spin_unlock(&tbl->slot_tbl_lock);
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return wait_for_completion_interruptible(&tbl->complete);
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}
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spin_unlock(&tbl->slot_tbl_lock);
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return 0;
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}
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static int nfs4_begin_drain_session(struct nfs_client *clp)
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{
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struct nfs4_session *ses = clp->cl_session;
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int ret = 0;
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if (clp->cl_slot_tbl)
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return nfs4_drain_slot_tbl(clp->cl_slot_tbl);
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/* back channel */
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ret = nfs4_drain_slot_tbl(&ses->bc_slot_table);
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if (ret)
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return ret;
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/* fore channel */
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return nfs4_drain_slot_tbl(&ses->fc_slot_table);
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}
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#if defined(CONFIG_NFS_V4_1)
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static int nfs41_setup_state_renewal(struct nfs_client *clp)
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{
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int status;
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struct nfs_fsinfo fsinfo;
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if (!test_bit(NFS_CS_CHECK_LEASE_TIME, &clp->cl_res_state)) {
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nfs4_schedule_state_renewal(clp);
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return 0;
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}
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status = nfs4_proc_get_lease_time(clp, &fsinfo);
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if (status == 0) {
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/* Update lease time and schedule renewal */
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spin_lock(&clp->cl_lock);
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clp->cl_lease_time = fsinfo.lease_time * HZ;
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clp->cl_last_renewal = jiffies;
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spin_unlock(&clp->cl_lock);
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nfs4_schedule_state_renewal(clp);
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}
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return status;
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}
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static void nfs41_finish_session_reset(struct nfs_client *clp)
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{
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clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
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clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
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/* create_session negotiated new slot table */
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clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
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nfs41_setup_state_renewal(clp);
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}
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int nfs41_init_clientid(struct nfs_client *clp, struct rpc_cred *cred)
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{
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int status;
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if (test_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state))
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goto do_confirm;
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status = nfs4_proc_exchange_id(clp, cred);
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if (status != 0)
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goto out;
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set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
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do_confirm:
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status = nfs4_proc_create_session(clp, cred);
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if (status != 0)
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goto out;
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nfs41_finish_session_reset(clp);
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nfs_mark_client_ready(clp, NFS_CS_READY);
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out:
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return status;
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}
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/**
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* nfs41_discover_server_trunking - Detect server IP address trunking (mv1)
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*
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* @clp: nfs_client under test
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* @result: OUT: found nfs_client, or clp
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* @cred: credential to use for trunking test
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*
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* Returns NFS4_OK, a negative errno, or a negative NFS4ERR status.
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* If NFS4_OK is returned, an nfs_client pointer is planted in
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* "result".
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*
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* Note: The returned client may not yet be marked ready.
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*/
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int nfs41_discover_server_trunking(struct nfs_client *clp,
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struct nfs_client **result,
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struct rpc_cred *cred)
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{
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int status;
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status = nfs4_proc_exchange_id(clp, cred);
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if (status != NFS4_OK)
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return status;
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status = nfs41_walk_client_list(clp, result, cred);
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if (status < 0)
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return status;
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if (clp != *result)
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return 0;
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/* Purge state if the client id was established in a prior instance */
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if (clp->cl_exchange_flags & EXCHGID4_FLAG_CONFIRMED_R)
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set_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state);
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else
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set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
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nfs4_schedule_state_manager(clp);
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status = nfs_wait_client_init_complete(clp);
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if (status < 0)
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nfs_put_client(clp);
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return status;
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}
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#endif /* CONFIG_NFS_V4_1 */
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|
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/**
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* nfs4_get_clid_cred - Acquire credential for a setclientid operation
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* @clp: client state handle
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*
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* Returns an rpc_cred with reference count bumped, or NULL.
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*/
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struct rpc_cred *nfs4_get_clid_cred(struct nfs_client *clp)
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{
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struct rpc_cred *cred;
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spin_lock(&clp->cl_lock);
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cred = nfs4_get_machine_cred_locked(clp);
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spin_unlock(&clp->cl_lock);
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return cred;
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}
|
|
|
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static struct nfs4_state_owner *
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nfs4_find_state_owner_locked(struct nfs_server *server, struct rpc_cred *cred)
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{
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struct rb_node **p = &server->state_owners.rb_node,
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*parent = NULL;
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struct nfs4_state_owner *sp;
|
|
|
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while (*p != NULL) {
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parent = *p;
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sp = rb_entry(parent, struct nfs4_state_owner, so_server_node);
|
|
|
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if (cred < sp->so_cred)
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p = &parent->rb_left;
|
|
else if (cred > sp->so_cred)
|
|
p = &parent->rb_right;
|
|
else {
|
|
if (!list_empty(&sp->so_lru))
|
|
list_del_init(&sp->so_lru);
|
|
atomic_inc(&sp->so_count);
|
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return sp;
|
|
}
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static struct nfs4_state_owner *
|
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nfs4_insert_state_owner_locked(struct nfs4_state_owner *new)
|
|
{
|
|
struct nfs_server *server = new->so_server;
|
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struct rb_node **p = &server->state_owners.rb_node,
|
|
*parent = NULL;
|
|
struct nfs4_state_owner *sp;
|
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int err;
|
|
|
|
while (*p != NULL) {
|
|
parent = *p;
|
|
sp = rb_entry(parent, struct nfs4_state_owner, so_server_node);
|
|
|
|
if (new->so_cred < sp->so_cred)
|
|
p = &parent->rb_left;
|
|
else if (new->so_cred > sp->so_cred)
|
|
p = &parent->rb_right;
|
|
else {
|
|
if (!list_empty(&sp->so_lru))
|
|
list_del_init(&sp->so_lru);
|
|
atomic_inc(&sp->so_count);
|
|
return sp;
|
|
}
|
|
}
|
|
err = ida_get_new(&server->openowner_id, &new->so_seqid.owner_id);
|
|
if (err)
|
|
return ERR_PTR(err);
|
|
rb_link_node(&new->so_server_node, parent, p);
|
|
rb_insert_color(&new->so_server_node, &server->state_owners);
|
|
return new;
|
|
}
|
|
|
|
static void
|
|
nfs4_remove_state_owner_locked(struct nfs4_state_owner *sp)
|
|
{
|
|
struct nfs_server *server = sp->so_server;
|
|
|
|
if (!RB_EMPTY_NODE(&sp->so_server_node))
|
|
rb_erase(&sp->so_server_node, &server->state_owners);
|
|
ida_remove(&server->openowner_id, sp->so_seqid.owner_id);
|
|
}
|
|
|
|
static void
|
|
nfs4_init_seqid_counter(struct nfs_seqid_counter *sc)
|
|
{
|
|
sc->create_time = ktime_get();
|
|
sc->flags = 0;
|
|
sc->counter = 0;
|
|
spin_lock_init(&sc->lock);
|
|
INIT_LIST_HEAD(&sc->list);
|
|
rpc_init_wait_queue(&sc->wait, "Seqid_waitqueue");
|
|
}
|
|
|
|
static void
|
|
nfs4_destroy_seqid_counter(struct nfs_seqid_counter *sc)
|
|
{
|
|
rpc_destroy_wait_queue(&sc->wait);
|
|
}
|
|
|
|
/*
|
|
* nfs4_alloc_state_owner(): this is called on the OPEN or CREATE path to
|
|
* create a new state_owner.
|
|
*
|
|
*/
|
|
static struct nfs4_state_owner *
|
|
nfs4_alloc_state_owner(struct nfs_server *server,
|
|
struct rpc_cred *cred,
|
|
gfp_t gfp_flags)
|
|
{
|
|
struct nfs4_state_owner *sp;
|
|
|
|
sp = kzalloc(sizeof(*sp), gfp_flags);
|
|
if (!sp)
|
|
return NULL;
|
|
sp->so_server = server;
|
|
sp->so_cred = get_rpccred(cred);
|
|
spin_lock_init(&sp->so_lock);
|
|
INIT_LIST_HEAD(&sp->so_states);
|
|
nfs4_init_seqid_counter(&sp->so_seqid);
|
|
atomic_set(&sp->so_count, 1);
|
|
INIT_LIST_HEAD(&sp->so_lru);
|
|
seqcount_init(&sp->so_reclaim_seqcount);
|
|
mutex_init(&sp->so_delegreturn_mutex);
|
|
return sp;
|
|
}
|
|
|
|
static void
|
|
nfs4_drop_state_owner(struct nfs4_state_owner *sp)
|
|
{
|
|
struct rb_node *rb_node = &sp->so_server_node;
|
|
|
|
if (!RB_EMPTY_NODE(rb_node)) {
|
|
struct nfs_server *server = sp->so_server;
|
|
struct nfs_client *clp = server->nfs_client;
|
|
|
|
spin_lock(&clp->cl_lock);
|
|
if (!RB_EMPTY_NODE(rb_node)) {
|
|
rb_erase(rb_node, &server->state_owners);
|
|
RB_CLEAR_NODE(rb_node);
|
|
}
|
|
spin_unlock(&clp->cl_lock);
|
|
}
|
|
}
|
|
|
|
static void nfs4_free_state_owner(struct nfs4_state_owner *sp)
|
|
{
|
|
nfs4_destroy_seqid_counter(&sp->so_seqid);
|
|
put_rpccred(sp->so_cred);
|
|
kfree(sp);
|
|
}
|
|
|
|
static void nfs4_gc_state_owners(struct nfs_server *server)
|
|
{
|
|
struct nfs_client *clp = server->nfs_client;
|
|
struct nfs4_state_owner *sp, *tmp;
|
|
unsigned long time_min, time_max;
|
|
LIST_HEAD(doomed);
|
|
|
|
spin_lock(&clp->cl_lock);
|
|
time_max = jiffies;
|
|
time_min = (long)time_max - (long)clp->cl_lease_time;
|
|
list_for_each_entry_safe(sp, tmp, &server->state_owners_lru, so_lru) {
|
|
/* NB: LRU is sorted so that oldest is at the head */
|
|
if (time_in_range(sp->so_expires, time_min, time_max))
|
|
break;
|
|
list_move(&sp->so_lru, &doomed);
|
|
nfs4_remove_state_owner_locked(sp);
|
|
}
|
|
spin_unlock(&clp->cl_lock);
|
|
|
|
list_for_each_entry_safe(sp, tmp, &doomed, so_lru) {
|
|
list_del(&sp->so_lru);
|
|
nfs4_free_state_owner(sp);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* nfs4_get_state_owner - Look up a state owner given a credential
|
|
* @server: nfs_server to search
|
|
* @cred: RPC credential to match
|
|
*
|
|
* Returns a pointer to an instantiated nfs4_state_owner struct, or NULL.
|
|
*/
|
|
struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *server,
|
|
struct rpc_cred *cred,
|
|
gfp_t gfp_flags)
|
|
{
|
|
struct nfs_client *clp = server->nfs_client;
|
|
struct nfs4_state_owner *sp, *new;
|
|
|
|
spin_lock(&clp->cl_lock);
|
|
sp = nfs4_find_state_owner_locked(server, cred);
|
|
spin_unlock(&clp->cl_lock);
|
|
if (sp != NULL)
|
|
goto out;
|
|
new = nfs4_alloc_state_owner(server, cred, gfp_flags);
|
|
if (new == NULL)
|
|
goto out;
|
|
do {
|
|
if (ida_pre_get(&server->openowner_id, gfp_flags) == 0)
|
|
break;
|
|
spin_lock(&clp->cl_lock);
|
|
sp = nfs4_insert_state_owner_locked(new);
|
|
spin_unlock(&clp->cl_lock);
|
|
} while (sp == ERR_PTR(-EAGAIN));
|
|
if (sp != new)
|
|
nfs4_free_state_owner(new);
|
|
out:
|
|
nfs4_gc_state_owners(server);
|
|
return sp;
|
|
}
|
|
|
|
/**
|
|
* nfs4_put_state_owner - Release a nfs4_state_owner
|
|
* @sp: state owner data to release
|
|
*
|
|
* Note that we keep released state owners on an LRU
|
|
* list.
|
|
* This caches valid state owners so that they can be
|
|
* reused, to avoid the OPEN_CONFIRM on minor version 0.
|
|
* It also pins the uniquifier of dropped state owners for
|
|
* a while, to ensure that those state owner names are
|
|
* never reused.
|
|
*/
|
|
void nfs4_put_state_owner(struct nfs4_state_owner *sp)
|
|
{
|
|
struct nfs_server *server = sp->so_server;
|
|
struct nfs_client *clp = server->nfs_client;
|
|
|
|
if (!atomic_dec_and_lock(&sp->so_count, &clp->cl_lock))
|
|
return;
|
|
|
|
sp->so_expires = jiffies;
|
|
list_add_tail(&sp->so_lru, &server->state_owners_lru);
|
|
spin_unlock(&clp->cl_lock);
|
|
}
|
|
|
|
/**
|
|
* nfs4_purge_state_owners - Release all cached state owners
|
|
* @server: nfs_server with cached state owners to release
|
|
*
|
|
* Called at umount time. Remaining state owners will be on
|
|
* the LRU with ref count of zero.
|
|
*/
|
|
void nfs4_purge_state_owners(struct nfs_server *server)
|
|
{
|
|
struct nfs_client *clp = server->nfs_client;
|
|
struct nfs4_state_owner *sp, *tmp;
|
|
LIST_HEAD(doomed);
|
|
|
|
spin_lock(&clp->cl_lock);
|
|
list_for_each_entry_safe(sp, tmp, &server->state_owners_lru, so_lru) {
|
|
list_move(&sp->so_lru, &doomed);
|
|
nfs4_remove_state_owner_locked(sp);
|
|
}
|
|
spin_unlock(&clp->cl_lock);
|
|
|
|
list_for_each_entry_safe(sp, tmp, &doomed, so_lru) {
|
|
list_del(&sp->so_lru);
|
|
nfs4_free_state_owner(sp);
|
|
}
|
|
}
|
|
|
|
static struct nfs4_state *
|
|
nfs4_alloc_open_state(void)
|
|
{
|
|
struct nfs4_state *state;
|
|
|
|
state = kzalloc(sizeof(*state), GFP_NOFS);
|
|
if (!state)
|
|
return NULL;
|
|
atomic_set(&state->count, 1);
|
|
INIT_LIST_HEAD(&state->lock_states);
|
|
spin_lock_init(&state->state_lock);
|
|
seqlock_init(&state->seqlock);
|
|
return state;
|
|
}
|
|
|
|
void
|
|
nfs4_state_set_mode_locked(struct nfs4_state *state, fmode_t fmode)
|
|
{
|
|
if (state->state == fmode)
|
|
return;
|
|
/* NB! List reordering - see the reclaim code for why. */
|
|
if ((fmode & FMODE_WRITE) != (state->state & FMODE_WRITE)) {
|
|
if (fmode & FMODE_WRITE)
|
|
list_move(&state->open_states, &state->owner->so_states);
|
|
else
|
|
list_move_tail(&state->open_states, &state->owner->so_states);
|
|
}
|
|
state->state = fmode;
|
|
}
|
|
|
|
static struct nfs4_state *
|
|
__nfs4_find_state_byowner(struct inode *inode, struct nfs4_state_owner *owner)
|
|
{
|
|
struct nfs_inode *nfsi = NFS_I(inode);
|
|
struct nfs4_state *state;
|
|
|
|
list_for_each_entry(state, &nfsi->open_states, inode_states) {
|
|
if (state->owner != owner)
|
|
continue;
|
|
if (!nfs4_valid_open_stateid(state))
|
|
continue;
|
|
if (atomic_inc_not_zero(&state->count))
|
|
return state;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static void
|
|
nfs4_free_open_state(struct nfs4_state *state)
|
|
{
|
|
kfree(state);
|
|
}
|
|
|
|
struct nfs4_state *
|
|
nfs4_get_open_state(struct inode *inode, struct nfs4_state_owner *owner)
|
|
{
|
|
struct nfs4_state *state, *new;
|
|
struct nfs_inode *nfsi = NFS_I(inode);
|
|
|
|
spin_lock(&inode->i_lock);
|
|
state = __nfs4_find_state_byowner(inode, owner);
|
|
spin_unlock(&inode->i_lock);
|
|
if (state)
|
|
goto out;
|
|
new = nfs4_alloc_open_state();
|
|
spin_lock(&owner->so_lock);
|
|
spin_lock(&inode->i_lock);
|
|
state = __nfs4_find_state_byowner(inode, owner);
|
|
if (state == NULL && new != NULL) {
|
|
state = new;
|
|
state->owner = owner;
|
|
atomic_inc(&owner->so_count);
|
|
list_add(&state->inode_states, &nfsi->open_states);
|
|
ihold(inode);
|
|
state->inode = inode;
|
|
spin_unlock(&inode->i_lock);
|
|
/* Note: The reclaim code dictates that we add stateless
|
|
* and read-only stateids to the end of the list */
|
|
list_add_tail(&state->open_states, &owner->so_states);
|
|
spin_unlock(&owner->so_lock);
|
|
} else {
|
|
spin_unlock(&inode->i_lock);
|
|
spin_unlock(&owner->so_lock);
|
|
if (new)
|
|
nfs4_free_open_state(new);
|
|
}
|
|
out:
|
|
return state;
|
|
}
|
|
|
|
void nfs4_put_open_state(struct nfs4_state *state)
|
|
{
|
|
struct inode *inode = state->inode;
|
|
struct nfs4_state_owner *owner = state->owner;
|
|
|
|
if (!atomic_dec_and_lock(&state->count, &owner->so_lock))
|
|
return;
|
|
spin_lock(&inode->i_lock);
|
|
list_del(&state->inode_states);
|
|
list_del(&state->open_states);
|
|
spin_unlock(&inode->i_lock);
|
|
spin_unlock(&owner->so_lock);
|
|
iput(inode);
|
|
nfs4_free_open_state(state);
|
|
nfs4_put_state_owner(owner);
|
|
}
|
|
|
|
/*
|
|
* Close the current file.
|
|
*/
|
|
static void __nfs4_close(struct nfs4_state *state,
|
|
fmode_t fmode, gfp_t gfp_mask, int wait)
|
|
{
|
|
struct nfs4_state_owner *owner = state->owner;
|
|
int call_close = 0;
|
|
fmode_t newstate;
|
|
|
|
atomic_inc(&owner->so_count);
|
|
/* Protect against nfs4_find_state() */
|
|
spin_lock(&owner->so_lock);
|
|
switch (fmode & (FMODE_READ | FMODE_WRITE)) {
|
|
case FMODE_READ:
|
|
state->n_rdonly--;
|
|
break;
|
|
case FMODE_WRITE:
|
|
state->n_wronly--;
|
|
break;
|
|
case FMODE_READ|FMODE_WRITE:
|
|
state->n_rdwr--;
|
|
}
|
|
newstate = FMODE_READ|FMODE_WRITE;
|
|
if (state->n_rdwr == 0) {
|
|
if (state->n_rdonly == 0) {
|
|
newstate &= ~FMODE_READ;
|
|
call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
|
|
call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
|
|
}
|
|
if (state->n_wronly == 0) {
|
|
newstate &= ~FMODE_WRITE;
|
|
call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
|
|
call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
|
|
}
|
|
if (newstate == 0)
|
|
clear_bit(NFS_DELEGATED_STATE, &state->flags);
|
|
}
|
|
nfs4_state_set_mode_locked(state, newstate);
|
|
spin_unlock(&owner->so_lock);
|
|
|
|
if (!call_close) {
|
|
nfs4_put_open_state(state);
|
|
nfs4_put_state_owner(owner);
|
|
} else
|
|
nfs4_do_close(state, gfp_mask, wait);
|
|
}
|
|
|
|
void nfs4_close_state(struct nfs4_state *state, fmode_t fmode)
|
|
{
|
|
__nfs4_close(state, fmode, GFP_NOFS, 0);
|
|
}
|
|
|
|
void nfs4_close_sync(struct nfs4_state *state, fmode_t fmode)
|
|
{
|
|
__nfs4_close(state, fmode, GFP_KERNEL, 1);
|
|
}
|
|
|
|
/*
|
|
* Search the state->lock_states for an existing lock_owner
|
|
* that is compatible with current->files
|
|
*/
|
|
static struct nfs4_lock_state *
|
|
__nfs4_find_lock_state(struct nfs4_state *state, fl_owner_t fl_owner)
|
|
{
|
|
struct nfs4_lock_state *pos;
|
|
list_for_each_entry(pos, &state->lock_states, ls_locks) {
|
|
if (pos->ls_owner != fl_owner)
|
|
continue;
|
|
atomic_inc(&pos->ls_count);
|
|
return pos;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* Return a compatible lock_state. If no initialized lock_state structure
|
|
* exists, return an uninitialized one.
|
|
*
|
|
*/
|
|
static struct nfs4_lock_state *nfs4_alloc_lock_state(struct nfs4_state *state, fl_owner_t fl_owner)
|
|
{
|
|
struct nfs4_lock_state *lsp;
|
|
struct nfs_server *server = state->owner->so_server;
|
|
|
|
lsp = kzalloc(sizeof(*lsp), GFP_NOFS);
|
|
if (lsp == NULL)
|
|
return NULL;
|
|
nfs4_init_seqid_counter(&lsp->ls_seqid);
|
|
atomic_set(&lsp->ls_count, 1);
|
|
lsp->ls_state = state;
|
|
lsp->ls_owner = fl_owner;
|
|
lsp->ls_seqid.owner_id = ida_simple_get(&server->lockowner_id, 0, 0, GFP_NOFS);
|
|
if (lsp->ls_seqid.owner_id < 0)
|
|
goto out_free;
|
|
INIT_LIST_HEAD(&lsp->ls_locks);
|
|
return lsp;
|
|
out_free:
|
|
kfree(lsp);
|
|
return NULL;
|
|
}
|
|
|
|
void nfs4_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp)
|
|
{
|
|
ida_simple_remove(&server->lockowner_id, lsp->ls_seqid.owner_id);
|
|
nfs4_destroy_seqid_counter(&lsp->ls_seqid);
|
|
kfree(lsp);
|
|
}
|
|
|
|
/*
|
|
* Return a compatible lock_state. If no initialized lock_state structure
|
|
* exists, return an uninitialized one.
|
|
*
|
|
*/
|
|
static struct nfs4_lock_state *nfs4_get_lock_state(struct nfs4_state *state, fl_owner_t owner)
|
|
{
|
|
struct nfs4_lock_state *lsp, *new = NULL;
|
|
|
|
for(;;) {
|
|
spin_lock(&state->state_lock);
|
|
lsp = __nfs4_find_lock_state(state, owner);
|
|
if (lsp != NULL)
|
|
break;
|
|
if (new != NULL) {
|
|
list_add(&new->ls_locks, &state->lock_states);
|
|
set_bit(LK_STATE_IN_USE, &state->flags);
|
|
lsp = new;
|
|
new = NULL;
|
|
break;
|
|
}
|
|
spin_unlock(&state->state_lock);
|
|
new = nfs4_alloc_lock_state(state, owner);
|
|
if (new == NULL)
|
|
return NULL;
|
|
}
|
|
spin_unlock(&state->state_lock);
|
|
if (new != NULL)
|
|
nfs4_free_lock_state(state->owner->so_server, new);
|
|
return lsp;
|
|
}
|
|
|
|
/*
|
|
* Release reference to lock_state, and free it if we see that
|
|
* it is no longer in use
|
|
*/
|
|
void nfs4_put_lock_state(struct nfs4_lock_state *lsp)
|
|
{
|
|
struct nfs_server *server;
|
|
struct nfs4_state *state;
|
|
|
|
if (lsp == NULL)
|
|
return;
|
|
state = lsp->ls_state;
|
|
if (!atomic_dec_and_lock(&lsp->ls_count, &state->state_lock))
|
|
return;
|
|
list_del(&lsp->ls_locks);
|
|
if (list_empty(&state->lock_states))
|
|
clear_bit(LK_STATE_IN_USE, &state->flags);
|
|
spin_unlock(&state->state_lock);
|
|
server = state->owner->so_server;
|
|
if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
|
|
struct nfs_client *clp = server->nfs_client;
|
|
|
|
clp->cl_mvops->free_lock_state(server, lsp);
|
|
} else
|
|
nfs4_free_lock_state(server, lsp);
|
|
}
|
|
|
|
static void nfs4_fl_copy_lock(struct file_lock *dst, struct file_lock *src)
|
|
{
|
|
struct nfs4_lock_state *lsp = src->fl_u.nfs4_fl.owner;
|
|
|
|
dst->fl_u.nfs4_fl.owner = lsp;
|
|
atomic_inc(&lsp->ls_count);
|
|
}
|
|
|
|
static void nfs4_fl_release_lock(struct file_lock *fl)
|
|
{
|
|
nfs4_put_lock_state(fl->fl_u.nfs4_fl.owner);
|
|
}
|
|
|
|
static const struct file_lock_operations nfs4_fl_lock_ops = {
|
|
.fl_copy_lock = nfs4_fl_copy_lock,
|
|
.fl_release_private = nfs4_fl_release_lock,
|
|
};
|
|
|
|
int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl)
|
|
{
|
|
struct nfs4_lock_state *lsp;
|
|
|
|
if (fl->fl_ops != NULL)
|
|
return 0;
|
|
lsp = nfs4_get_lock_state(state, fl->fl_owner);
|
|
if (lsp == NULL)
|
|
return -ENOMEM;
|
|
fl->fl_u.nfs4_fl.owner = lsp;
|
|
fl->fl_ops = &nfs4_fl_lock_ops;
|
|
return 0;
|
|
}
|
|
|
|
static int nfs4_copy_lock_stateid(nfs4_stateid *dst,
|
|
struct nfs4_state *state,
|
|
const struct nfs_lockowner *lockowner)
|
|
{
|
|
struct nfs4_lock_state *lsp;
|
|
fl_owner_t fl_owner;
|
|
int ret = -ENOENT;
|
|
|
|
|
|
if (lockowner == NULL)
|
|
goto out;
|
|
|
|
if (test_bit(LK_STATE_IN_USE, &state->flags) == 0)
|
|
goto out;
|
|
|
|
fl_owner = lockowner->l_owner;
|
|
spin_lock(&state->state_lock);
|
|
lsp = __nfs4_find_lock_state(state, fl_owner);
|
|
if (lsp && test_bit(NFS_LOCK_LOST, &lsp->ls_flags))
|
|
ret = -EIO;
|
|
else if (lsp != NULL && test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0) {
|
|
nfs4_stateid_copy(dst, &lsp->ls_stateid);
|
|
ret = 0;
|
|
}
|
|
spin_unlock(&state->state_lock);
|
|
nfs4_put_lock_state(lsp);
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static void nfs4_copy_open_stateid(nfs4_stateid *dst, struct nfs4_state *state)
|
|
{
|
|
const nfs4_stateid *src;
|
|
int seq;
|
|
|
|
do {
|
|
src = &zero_stateid;
|
|
seq = read_seqbegin(&state->seqlock);
|
|
if (test_bit(NFS_OPEN_STATE, &state->flags))
|
|
src = &state->open_stateid;
|
|
nfs4_stateid_copy(dst, src);
|
|
} while (read_seqretry(&state->seqlock, seq));
|
|
}
|
|
|
|
/*
|
|
* Byte-range lock aware utility to initialize the stateid of read/write
|
|
* requests.
|
|
*/
|
|
int nfs4_select_rw_stateid(struct nfs4_state *state,
|
|
fmode_t fmode, const struct nfs_lockowner *lockowner,
|
|
nfs4_stateid *dst, struct rpc_cred **cred)
|
|
{
|
|
int ret;
|
|
|
|
if (cred != NULL)
|
|
*cred = NULL;
|
|
ret = nfs4_copy_lock_stateid(dst, state, lockowner);
|
|
if (ret == -EIO)
|
|
/* A lost lock - don't even consider delegations */
|
|
goto out;
|
|
/* returns true if delegation stateid found and copied */
|
|
if (nfs4_copy_delegation_stateid(state->inode, fmode, dst, cred)) {
|
|
ret = 0;
|
|
goto out;
|
|
}
|
|
if (ret != -ENOENT)
|
|
/* nfs4_copy_delegation_stateid() didn't over-write
|
|
* dst, so it still has the lock stateid which we now
|
|
* choose to use.
|
|
*/
|
|
goto out;
|
|
nfs4_copy_open_stateid(dst, state);
|
|
ret = 0;
|
|
out:
|
|
if (nfs_server_capable(state->inode, NFS_CAP_STATEID_NFSV41))
|
|
dst->seqid = 0;
|
|
return ret;
|
|
}
|
|
|
|
struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask)
|
|
{
|
|
struct nfs_seqid *new;
|
|
|
|
new = kmalloc(sizeof(*new), gfp_mask);
|
|
if (new == NULL)
|
|
return ERR_PTR(-ENOMEM);
|
|
new->sequence = counter;
|
|
INIT_LIST_HEAD(&new->list);
|
|
new->task = NULL;
|
|
return new;
|
|
}
|
|
|
|
void nfs_release_seqid(struct nfs_seqid *seqid)
|
|
{
|
|
struct nfs_seqid_counter *sequence;
|
|
|
|
if (seqid == NULL || list_empty(&seqid->list))
|
|
return;
|
|
sequence = seqid->sequence;
|
|
spin_lock(&sequence->lock);
|
|
list_del_init(&seqid->list);
|
|
if (!list_empty(&sequence->list)) {
|
|
struct nfs_seqid *next;
|
|
|
|
next = list_first_entry(&sequence->list,
|
|
struct nfs_seqid, list);
|
|
rpc_wake_up_queued_task(&sequence->wait, next->task);
|
|
}
|
|
spin_unlock(&sequence->lock);
|
|
}
|
|
|
|
void nfs_free_seqid(struct nfs_seqid *seqid)
|
|
{
|
|
nfs_release_seqid(seqid);
|
|
kfree(seqid);
|
|
}
|
|
|
|
/*
|
|
* Increment the seqid if the OPEN/OPEN_DOWNGRADE/CLOSE succeeded, or
|
|
* failed with a seqid incrementing error -
|
|
* see comments nfs4.h:seqid_mutating_error()
|
|
*/
|
|
static void nfs_increment_seqid(int status, struct nfs_seqid *seqid)
|
|
{
|
|
switch (status) {
|
|
case 0:
|
|
break;
|
|
case -NFS4ERR_BAD_SEQID:
|
|
if (seqid->sequence->flags & NFS_SEQID_CONFIRMED)
|
|
return;
|
|
pr_warn_ratelimited("NFS: v4 server returned a bad"
|
|
" sequence-id error on an"
|
|
" unconfirmed sequence %p!\n",
|
|
seqid->sequence);
|
|
case -NFS4ERR_STALE_CLIENTID:
|
|
case -NFS4ERR_STALE_STATEID:
|
|
case -NFS4ERR_BAD_STATEID:
|
|
case -NFS4ERR_BADXDR:
|
|
case -NFS4ERR_RESOURCE:
|
|
case -NFS4ERR_NOFILEHANDLE:
|
|
/* Non-seqid mutating errors */
|
|
return;
|
|
};
|
|
/*
|
|
* Note: no locking needed as we are guaranteed to be first
|
|
* on the sequence list
|
|
*/
|
|
seqid->sequence->counter++;
|
|
}
|
|
|
|
void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid)
|
|
{
|
|
struct nfs4_state_owner *sp;
|
|
|
|
if (seqid == NULL)
|
|
return;
|
|
|
|
sp = container_of(seqid->sequence, struct nfs4_state_owner, so_seqid);
|
|
if (status == -NFS4ERR_BAD_SEQID)
|
|
nfs4_drop_state_owner(sp);
|
|
if (!nfs4_has_session(sp->so_server->nfs_client))
|
|
nfs_increment_seqid(status, seqid);
|
|
}
|
|
|
|
/*
|
|
* Increment the seqid if the LOCK/LOCKU succeeded, or
|
|
* failed with a seqid incrementing error -
|
|
* see comments nfs4.h:seqid_mutating_error()
|
|
*/
|
|
void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid)
|
|
{
|
|
if (seqid != NULL)
|
|
nfs_increment_seqid(status, seqid);
|
|
}
|
|
|
|
int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task)
|
|
{
|
|
struct nfs_seqid_counter *sequence;
|
|
int status = 0;
|
|
|
|
if (seqid == NULL)
|
|
goto out;
|
|
sequence = seqid->sequence;
|
|
spin_lock(&sequence->lock);
|
|
seqid->task = task;
|
|
if (list_empty(&seqid->list))
|
|
list_add_tail(&seqid->list, &sequence->list);
|
|
if (list_first_entry(&sequence->list, struct nfs_seqid, list) == seqid)
|
|
goto unlock;
|
|
rpc_sleep_on(&sequence->wait, task, NULL);
|
|
status = -EAGAIN;
|
|
unlock:
|
|
spin_unlock(&sequence->lock);
|
|
out:
|
|
return status;
|
|
}
|
|
|
|
static int nfs4_run_state_manager(void *);
|
|
|
|
static void nfs4_clear_state_manager_bit(struct nfs_client *clp)
|
|
{
|
|
smp_mb__before_atomic();
|
|
clear_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state);
|
|
smp_mb__after_atomic();
|
|
wake_up_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING);
|
|
rpc_wake_up(&clp->cl_rpcwaitq);
|
|
}
|
|
|
|
/*
|
|
* Schedule the nfs_client asynchronous state management routine
|
|
*/
|
|
void nfs4_schedule_state_manager(struct nfs_client *clp)
|
|
{
|
|
struct task_struct *task;
|
|
char buf[INET6_ADDRSTRLEN + sizeof("-manager") + 1];
|
|
|
|
if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0)
|
|
return;
|
|
__module_get(THIS_MODULE);
|
|
atomic_inc(&clp->cl_count);
|
|
|
|
/* The rcu_read_lock() is not strictly necessary, as the state
|
|
* manager is the only thread that ever changes the rpc_xprt
|
|
* after it's initialized. At this point, we're single threaded. */
|
|
rcu_read_lock();
|
|
snprintf(buf, sizeof(buf), "%s-manager",
|
|
rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR));
|
|
rcu_read_unlock();
|
|
task = kthread_run(nfs4_run_state_manager, clp, "%s", buf);
|
|
if (IS_ERR(task)) {
|
|
printk(KERN_ERR "%s: kthread_run: %ld\n",
|
|
__func__, PTR_ERR(task));
|
|
nfs4_clear_state_manager_bit(clp);
|
|
nfs_put_client(clp);
|
|
module_put(THIS_MODULE);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Schedule a lease recovery attempt
|
|
*/
|
|
void nfs4_schedule_lease_recovery(struct nfs_client *clp)
|
|
{
|
|
if (!clp)
|
|
return;
|
|
if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
|
|
set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
|
|
dprintk("%s: scheduling lease recovery for server %s\n", __func__,
|
|
clp->cl_hostname);
|
|
nfs4_schedule_state_manager(clp);
|
|
}
|
|
EXPORT_SYMBOL_GPL(nfs4_schedule_lease_recovery);
|
|
|
|
/**
|
|
* nfs4_schedule_migration_recovery - trigger migration recovery
|
|
*
|
|
* @server: FSID that is migrating
|
|
*
|
|
* Returns zero if recovery has started, otherwise a negative NFS4ERR
|
|
* value is returned.
|
|
*/
|
|
int nfs4_schedule_migration_recovery(const struct nfs_server *server)
|
|
{
|
|
struct nfs_client *clp = server->nfs_client;
|
|
|
|
if (server->fh_expire_type != NFS4_FH_PERSISTENT) {
|
|
pr_err("NFS: volatile file handles not supported (server %s)\n",
|
|
clp->cl_hostname);
|
|
return -NFS4ERR_IO;
|
|
}
|
|
|
|
if (test_bit(NFS_MIG_FAILED, &server->mig_status))
|
|
return -NFS4ERR_IO;
|
|
|
|
dprintk("%s: scheduling migration recovery for (%llx:%llx) on %s\n",
|
|
__func__,
|
|
(unsigned long long)server->fsid.major,
|
|
(unsigned long long)server->fsid.minor,
|
|
clp->cl_hostname);
|
|
|
|
set_bit(NFS_MIG_IN_TRANSITION,
|
|
&((struct nfs_server *)server)->mig_status);
|
|
set_bit(NFS4CLNT_MOVED, &clp->cl_state);
|
|
|
|
nfs4_schedule_state_manager(clp);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(nfs4_schedule_migration_recovery);
|
|
|
|
/**
|
|
* nfs4_schedule_lease_moved_recovery - start lease-moved recovery
|
|
*
|
|
* @clp: server to check for moved leases
|
|
*
|
|
*/
|
|
void nfs4_schedule_lease_moved_recovery(struct nfs_client *clp)
|
|
{
|
|
dprintk("%s: scheduling lease-moved recovery for client ID %llx on %s\n",
|
|
__func__, clp->cl_clientid, clp->cl_hostname);
|
|
|
|
set_bit(NFS4CLNT_LEASE_MOVED, &clp->cl_state);
|
|
nfs4_schedule_state_manager(clp);
|
|
}
|
|
EXPORT_SYMBOL_GPL(nfs4_schedule_lease_moved_recovery);
|
|
|
|
int nfs4_wait_clnt_recover(struct nfs_client *clp)
|
|
{
|
|
int res;
|
|
|
|
might_sleep();
|
|
|
|
atomic_inc(&clp->cl_count);
|
|
res = wait_on_bit_action(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING,
|
|
nfs_wait_bit_killable, TASK_KILLABLE);
|
|
if (res)
|
|
goto out;
|
|
if (clp->cl_cons_state < 0)
|
|
res = clp->cl_cons_state;
|
|
out:
|
|
nfs_put_client(clp);
|
|
return res;
|
|
}
|
|
|
|
int nfs4_client_recover_expired_lease(struct nfs_client *clp)
|
|
{
|
|
unsigned int loop;
|
|
int ret;
|
|
|
|
for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
|
|
ret = nfs4_wait_clnt_recover(clp);
|
|
if (ret != 0)
|
|
break;
|
|
if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) &&
|
|
!test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state))
|
|
break;
|
|
nfs4_schedule_state_manager(clp);
|
|
ret = -EIO;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* nfs40_handle_cb_pathdown - return all delegations after NFS4ERR_CB_PATH_DOWN
|
|
* @clp: client to process
|
|
*
|
|
* Set the NFS4CLNT_LEASE_EXPIRED state in order to force a
|
|
* resend of the SETCLIENTID and hence re-establish the
|
|
* callback channel. Then return all existing delegations.
|
|
*/
|
|
static void nfs40_handle_cb_pathdown(struct nfs_client *clp)
|
|
{
|
|
set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
|
|
nfs_expire_all_delegations(clp);
|
|
dprintk("%s: handling CB_PATHDOWN recovery for server %s\n", __func__,
|
|
clp->cl_hostname);
|
|
}
|
|
|
|
void nfs4_schedule_path_down_recovery(struct nfs_client *clp)
|
|
{
|
|
nfs40_handle_cb_pathdown(clp);
|
|
nfs4_schedule_state_manager(clp);
|
|
}
|
|
|
|
static int nfs4_state_mark_reclaim_reboot(struct nfs_client *clp, struct nfs4_state *state)
|
|
{
|
|
|
|
set_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
|
|
/* Don't recover state that expired before the reboot */
|
|
if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) {
|
|
clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
|
|
return 0;
|
|
}
|
|
set_bit(NFS_OWNER_RECLAIM_REBOOT, &state->owner->so_flags);
|
|
set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
|
|
return 1;
|
|
}
|
|
|
|
int nfs4_state_mark_reclaim_nograce(struct nfs_client *clp, struct nfs4_state *state)
|
|
{
|
|
set_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags);
|
|
clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
|
|
set_bit(NFS_OWNER_RECLAIM_NOGRACE, &state->owner->so_flags);
|
|
set_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state);
|
|
return 1;
|
|
}
|
|
|
|
int nfs4_schedule_stateid_recovery(const struct nfs_server *server, struct nfs4_state *state)
|
|
{
|
|
struct nfs_client *clp = server->nfs_client;
|
|
|
|
if (!nfs4_valid_open_stateid(state))
|
|
return -EBADF;
|
|
nfs4_state_mark_reclaim_nograce(clp, state);
|
|
dprintk("%s: scheduling stateid recovery for server %s\n", __func__,
|
|
clp->cl_hostname);
|
|
nfs4_schedule_state_manager(clp);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(nfs4_schedule_stateid_recovery);
|
|
|
|
void nfs_inode_find_state_and_recover(struct inode *inode,
|
|
const nfs4_stateid *stateid)
|
|
{
|
|
struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
|
|
struct nfs_inode *nfsi = NFS_I(inode);
|
|
struct nfs_open_context *ctx;
|
|
struct nfs4_state *state;
|
|
bool found = false;
|
|
|
|
spin_lock(&inode->i_lock);
|
|
list_for_each_entry(ctx, &nfsi->open_files, list) {
|
|
state = ctx->state;
|
|
if (state == NULL)
|
|
continue;
|
|
if (!test_bit(NFS_DELEGATED_STATE, &state->flags))
|
|
continue;
|
|
if (!nfs4_stateid_match(&state->stateid, stateid))
|
|
continue;
|
|
nfs4_state_mark_reclaim_nograce(clp, state);
|
|
found = true;
|
|
}
|
|
spin_unlock(&inode->i_lock);
|
|
if (found)
|
|
nfs4_schedule_state_manager(clp);
|
|
}
|
|
|
|
static void nfs4_state_mark_open_context_bad(struct nfs4_state *state)
|
|
{
|
|
struct inode *inode = state->inode;
|
|
struct nfs_inode *nfsi = NFS_I(inode);
|
|
struct nfs_open_context *ctx;
|
|
|
|
spin_lock(&inode->i_lock);
|
|
list_for_each_entry(ctx, &nfsi->open_files, list) {
|
|
if (ctx->state != state)
|
|
continue;
|
|
set_bit(NFS_CONTEXT_BAD, &ctx->flags);
|
|
}
|
|
spin_unlock(&inode->i_lock);
|
|
}
|
|
|
|
static void nfs4_state_mark_recovery_failed(struct nfs4_state *state, int error)
|
|
{
|
|
set_bit(NFS_STATE_RECOVERY_FAILED, &state->flags);
|
|
nfs4_state_mark_open_context_bad(state);
|
|
}
|
|
|
|
|
|
static int nfs4_reclaim_locks(struct nfs4_state *state, const struct nfs4_state_recovery_ops *ops)
|
|
{
|
|
struct inode *inode = state->inode;
|
|
struct nfs_inode *nfsi = NFS_I(inode);
|
|
struct file_lock *fl;
|
|
int status = 0;
|
|
struct file_lock_context *flctx = inode->i_flctx;
|
|
struct list_head *list;
|
|
|
|
if (flctx == NULL)
|
|
return 0;
|
|
|
|
list = &flctx->flc_posix;
|
|
|
|
/* Guard against delegation returns and new lock/unlock calls */
|
|
down_write(&nfsi->rwsem);
|
|
spin_lock(&flctx->flc_lock);
|
|
restart:
|
|
list_for_each_entry(fl, list, fl_list) {
|
|
if (nfs_file_open_context(fl->fl_file)->state != state)
|
|
continue;
|
|
spin_unlock(&flctx->flc_lock);
|
|
status = ops->recover_lock(state, fl);
|
|
switch (status) {
|
|
case 0:
|
|
break;
|
|
case -ESTALE:
|
|
case -NFS4ERR_ADMIN_REVOKED:
|
|
case -NFS4ERR_STALE_STATEID:
|
|
case -NFS4ERR_BAD_STATEID:
|
|
case -NFS4ERR_EXPIRED:
|
|
case -NFS4ERR_NO_GRACE:
|
|
case -NFS4ERR_STALE_CLIENTID:
|
|
case -NFS4ERR_BADSESSION:
|
|
case -NFS4ERR_BADSLOT:
|
|
case -NFS4ERR_BAD_HIGH_SLOT:
|
|
case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
|
|
goto out;
|
|
default:
|
|
pr_err("NFS: %s: unhandled error %d\n",
|
|
__func__, status);
|
|
case -ENOMEM:
|
|
case -NFS4ERR_DENIED:
|
|
case -NFS4ERR_RECLAIM_BAD:
|
|
case -NFS4ERR_RECLAIM_CONFLICT:
|
|
/* kill_proc(fl->fl_pid, SIGLOST, 1); */
|
|
status = 0;
|
|
}
|
|
spin_lock(&flctx->flc_lock);
|
|
}
|
|
if (list == &flctx->flc_posix) {
|
|
list = &flctx->flc_flock;
|
|
goto restart;
|
|
}
|
|
spin_unlock(&flctx->flc_lock);
|
|
out:
|
|
up_write(&nfsi->rwsem);
|
|
return status;
|
|
}
|
|
|
|
static int nfs4_reclaim_open_state(struct nfs4_state_owner *sp, const struct nfs4_state_recovery_ops *ops)
|
|
{
|
|
struct nfs4_state *state;
|
|
struct nfs4_lock_state *lock;
|
|
int status = 0;
|
|
|
|
/* Note: we rely on the sp->so_states list being ordered
|
|
* so that we always reclaim open(O_RDWR) and/or open(O_WRITE)
|
|
* states first.
|
|
* This is needed to ensure that the server won't give us any
|
|
* read delegations that we have to return if, say, we are
|
|
* recovering after a network partition or a reboot from a
|
|
* server that doesn't support a grace period.
|
|
*/
|
|
spin_lock(&sp->so_lock);
|
|
raw_write_seqcount_begin(&sp->so_reclaim_seqcount);
|
|
restart:
|
|
list_for_each_entry(state, &sp->so_states, open_states) {
|
|
if (!test_and_clear_bit(ops->state_flag_bit, &state->flags))
|
|
continue;
|
|
if (!nfs4_valid_open_stateid(state))
|
|
continue;
|
|
if (state->state == 0)
|
|
continue;
|
|
atomic_inc(&state->count);
|
|
spin_unlock(&sp->so_lock);
|
|
status = ops->recover_open(sp, state);
|
|
if (status >= 0) {
|
|
status = nfs4_reclaim_locks(state, ops);
|
|
if (status >= 0) {
|
|
if (!test_bit(NFS_DELEGATED_STATE, &state->flags)) {
|
|
spin_lock(&state->state_lock);
|
|
list_for_each_entry(lock, &state->lock_states, ls_locks) {
|
|
if (!test_bit(NFS_LOCK_INITIALIZED, &lock->ls_flags))
|
|
pr_warn_ratelimited("NFS: "
|
|
"%s: Lock reclaim "
|
|
"failed!\n", __func__);
|
|
}
|
|
spin_unlock(&state->state_lock);
|
|
}
|
|
nfs4_put_open_state(state);
|
|
clear_bit(NFS_STATE_RECLAIM_NOGRACE,
|
|
&state->flags);
|
|
spin_lock(&sp->so_lock);
|
|
goto restart;
|
|
}
|
|
}
|
|
switch (status) {
|
|
default:
|
|
printk(KERN_ERR "NFS: %s: unhandled error %d\n",
|
|
__func__, status);
|
|
case -ENOENT:
|
|
case -ENOMEM:
|
|
case -ESTALE:
|
|
/* Open state on this file cannot be recovered */
|
|
nfs4_state_mark_recovery_failed(state, status);
|
|
break;
|
|
case -EAGAIN:
|
|
ssleep(1);
|
|
case -NFS4ERR_ADMIN_REVOKED:
|
|
case -NFS4ERR_STALE_STATEID:
|
|
case -NFS4ERR_BAD_STATEID:
|
|
case -NFS4ERR_RECLAIM_BAD:
|
|
case -NFS4ERR_RECLAIM_CONFLICT:
|
|
nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state);
|
|
break;
|
|
case -NFS4ERR_EXPIRED:
|
|
case -NFS4ERR_NO_GRACE:
|
|
nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state);
|
|
case -NFS4ERR_STALE_CLIENTID:
|
|
case -NFS4ERR_BADSESSION:
|
|
case -NFS4ERR_BADSLOT:
|
|
case -NFS4ERR_BAD_HIGH_SLOT:
|
|
case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
|
|
goto out_err;
|
|
}
|
|
nfs4_put_open_state(state);
|
|
spin_lock(&sp->so_lock);
|
|
goto restart;
|
|
}
|
|
raw_write_seqcount_end(&sp->so_reclaim_seqcount);
|
|
spin_unlock(&sp->so_lock);
|
|
return 0;
|
|
out_err:
|
|
nfs4_put_open_state(state);
|
|
spin_lock(&sp->so_lock);
|
|
raw_write_seqcount_end(&sp->so_reclaim_seqcount);
|
|
spin_unlock(&sp->so_lock);
|
|
return status;
|
|
}
|
|
|
|
static void nfs4_clear_open_state(struct nfs4_state *state)
|
|
{
|
|
struct nfs4_lock_state *lock;
|
|
|
|
clear_bit(NFS_DELEGATED_STATE, &state->flags);
|
|
clear_bit(NFS_O_RDONLY_STATE, &state->flags);
|
|
clear_bit(NFS_O_WRONLY_STATE, &state->flags);
|
|
clear_bit(NFS_O_RDWR_STATE, &state->flags);
|
|
spin_lock(&state->state_lock);
|
|
list_for_each_entry(lock, &state->lock_states, ls_locks) {
|
|
lock->ls_seqid.flags = 0;
|
|
clear_bit(NFS_LOCK_INITIALIZED, &lock->ls_flags);
|
|
}
|
|
spin_unlock(&state->state_lock);
|
|
}
|
|
|
|
static void nfs4_reset_seqids(struct nfs_server *server,
|
|
int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state))
|
|
{
|
|
struct nfs_client *clp = server->nfs_client;
|
|
struct nfs4_state_owner *sp;
|
|
struct rb_node *pos;
|
|
struct nfs4_state *state;
|
|
|
|
spin_lock(&clp->cl_lock);
|
|
for (pos = rb_first(&server->state_owners);
|
|
pos != NULL;
|
|
pos = rb_next(pos)) {
|
|
sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
|
|
sp->so_seqid.flags = 0;
|
|
spin_lock(&sp->so_lock);
|
|
list_for_each_entry(state, &sp->so_states, open_states) {
|
|
if (mark_reclaim(clp, state))
|
|
nfs4_clear_open_state(state);
|
|
}
|
|
spin_unlock(&sp->so_lock);
|
|
}
|
|
spin_unlock(&clp->cl_lock);
|
|
}
|
|
|
|
static void nfs4_state_mark_reclaim_helper(struct nfs_client *clp,
|
|
int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state))
|
|
{
|
|
struct nfs_server *server;
|
|
|
|
rcu_read_lock();
|
|
list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
|
|
nfs4_reset_seqids(server, mark_reclaim);
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
static void nfs4_state_start_reclaim_reboot(struct nfs_client *clp)
|
|
{
|
|
/* Mark all delegations for reclaim */
|
|
nfs_delegation_mark_reclaim(clp);
|
|
nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_reboot);
|
|
}
|
|
|
|
static void nfs4_reclaim_complete(struct nfs_client *clp,
|
|
const struct nfs4_state_recovery_ops *ops,
|
|
struct rpc_cred *cred)
|
|
{
|
|
/* Notify the server we're done reclaiming our state */
|
|
if (ops->reclaim_complete)
|
|
(void)ops->reclaim_complete(clp, cred);
|
|
}
|
|
|
|
static void nfs4_clear_reclaim_server(struct nfs_server *server)
|
|
{
|
|
struct nfs_client *clp = server->nfs_client;
|
|
struct nfs4_state_owner *sp;
|
|
struct rb_node *pos;
|
|
struct nfs4_state *state;
|
|
|
|
spin_lock(&clp->cl_lock);
|
|
for (pos = rb_first(&server->state_owners);
|
|
pos != NULL;
|
|
pos = rb_next(pos)) {
|
|
sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
|
|
spin_lock(&sp->so_lock);
|
|
list_for_each_entry(state, &sp->so_states, open_states) {
|
|
if (!test_and_clear_bit(NFS_STATE_RECLAIM_REBOOT,
|
|
&state->flags))
|
|
continue;
|
|
nfs4_state_mark_reclaim_nograce(clp, state);
|
|
}
|
|
spin_unlock(&sp->so_lock);
|
|
}
|
|
spin_unlock(&clp->cl_lock);
|
|
}
|
|
|
|
static int nfs4_state_clear_reclaim_reboot(struct nfs_client *clp)
|
|
{
|
|
struct nfs_server *server;
|
|
|
|
if (!test_and_clear_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state))
|
|
return 0;
|
|
|
|
rcu_read_lock();
|
|
list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
|
|
nfs4_clear_reclaim_server(server);
|
|
rcu_read_unlock();
|
|
|
|
nfs_delegation_reap_unclaimed(clp);
|
|
return 1;
|
|
}
|
|
|
|
static void nfs4_state_end_reclaim_reboot(struct nfs_client *clp)
|
|
{
|
|
const struct nfs4_state_recovery_ops *ops;
|
|
struct rpc_cred *cred;
|
|
|
|
if (!nfs4_state_clear_reclaim_reboot(clp))
|
|
return;
|
|
ops = clp->cl_mvops->reboot_recovery_ops;
|
|
cred = nfs4_get_clid_cred(clp);
|
|
nfs4_reclaim_complete(clp, ops, cred);
|
|
put_rpccred(cred);
|
|
}
|
|
|
|
static void nfs_delegation_clear_all(struct nfs_client *clp)
|
|
{
|
|
nfs_delegation_mark_reclaim(clp);
|
|
nfs_delegation_reap_unclaimed(clp);
|
|
}
|
|
|
|
static void nfs4_state_start_reclaim_nograce(struct nfs_client *clp)
|
|
{
|
|
nfs_delegation_clear_all(clp);
|
|
nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_nograce);
|
|
}
|
|
|
|
static int nfs4_recovery_handle_error(struct nfs_client *clp, int error)
|
|
{
|
|
switch (error) {
|
|
case 0:
|
|
break;
|
|
case -NFS4ERR_CB_PATH_DOWN:
|
|
nfs40_handle_cb_pathdown(clp);
|
|
break;
|
|
case -NFS4ERR_NO_GRACE:
|
|
nfs4_state_end_reclaim_reboot(clp);
|
|
break;
|
|
case -NFS4ERR_STALE_CLIENTID:
|
|
set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
|
|
nfs4_state_clear_reclaim_reboot(clp);
|
|
nfs4_state_start_reclaim_reboot(clp);
|
|
break;
|
|
case -NFS4ERR_EXPIRED:
|
|
set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
|
|
nfs4_state_start_reclaim_nograce(clp);
|
|
break;
|
|
case -NFS4ERR_BADSESSION:
|
|
case -NFS4ERR_BADSLOT:
|
|
case -NFS4ERR_BAD_HIGH_SLOT:
|
|
case -NFS4ERR_DEADSESSION:
|
|
case -NFS4ERR_SEQ_FALSE_RETRY:
|
|
case -NFS4ERR_SEQ_MISORDERED:
|
|
set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
|
|
/* Zero session reset errors */
|
|
break;
|
|
case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
|
|
set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
|
|
break;
|
|
default:
|
|
dprintk("%s: failed to handle error %d for server %s\n",
|
|
__func__, error, clp->cl_hostname);
|
|
return error;
|
|
}
|
|
dprintk("%s: handled error %d for server %s\n", __func__, error,
|
|
clp->cl_hostname);
|
|
return 0;
|
|
}
|
|
|
|
static int nfs4_do_reclaim(struct nfs_client *clp, const struct nfs4_state_recovery_ops *ops)
|
|
{
|
|
struct nfs4_state_owner *sp;
|
|
struct nfs_server *server;
|
|
struct rb_node *pos;
|
|
int status = 0;
|
|
|
|
restart:
|
|
rcu_read_lock();
|
|
list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
|
|
nfs4_purge_state_owners(server);
|
|
spin_lock(&clp->cl_lock);
|
|
for (pos = rb_first(&server->state_owners);
|
|
pos != NULL;
|
|
pos = rb_next(pos)) {
|
|
sp = rb_entry(pos,
|
|
struct nfs4_state_owner, so_server_node);
|
|
if (!test_and_clear_bit(ops->owner_flag_bit,
|
|
&sp->so_flags))
|
|
continue;
|
|
if (!atomic_inc_not_zero(&sp->so_count))
|
|
continue;
|
|
spin_unlock(&clp->cl_lock);
|
|
rcu_read_unlock();
|
|
|
|
status = nfs4_reclaim_open_state(sp, ops);
|
|
if (status < 0) {
|
|
set_bit(ops->owner_flag_bit, &sp->so_flags);
|
|
nfs4_put_state_owner(sp);
|
|
status = nfs4_recovery_handle_error(clp, status);
|
|
return (status != 0) ? status : -EAGAIN;
|
|
}
|
|
|
|
nfs4_put_state_owner(sp);
|
|
goto restart;
|
|
}
|
|
spin_unlock(&clp->cl_lock);
|
|
}
|
|
rcu_read_unlock();
|
|
return 0;
|
|
}
|
|
|
|
static int nfs4_check_lease(struct nfs_client *clp)
|
|
{
|
|
struct rpc_cred *cred;
|
|
const struct nfs4_state_maintenance_ops *ops =
|
|
clp->cl_mvops->state_renewal_ops;
|
|
int status;
|
|
|
|
/* Is the client already known to have an expired lease? */
|
|
if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
|
|
return 0;
|
|
spin_lock(&clp->cl_lock);
|
|
cred = ops->get_state_renewal_cred_locked(clp);
|
|
spin_unlock(&clp->cl_lock);
|
|
if (cred == NULL) {
|
|
cred = nfs4_get_clid_cred(clp);
|
|
status = -ENOKEY;
|
|
if (cred == NULL)
|
|
goto out;
|
|
}
|
|
status = ops->renew_lease(clp, cred);
|
|
put_rpccred(cred);
|
|
if (status == -ETIMEDOUT) {
|
|
set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
|
|
return 0;
|
|
}
|
|
out:
|
|
return nfs4_recovery_handle_error(clp, status);
|
|
}
|
|
|
|
/* Set NFS4CLNT_LEASE_EXPIRED and reclaim reboot state for all v4.0 errors
|
|
* and for recoverable errors on EXCHANGE_ID for v4.1
|
|
*/
|
|
static int nfs4_handle_reclaim_lease_error(struct nfs_client *clp, int status)
|
|
{
|
|
switch (status) {
|
|
case -NFS4ERR_SEQ_MISORDERED:
|
|
if (test_and_set_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state))
|
|
return -ESERVERFAULT;
|
|
/* Lease confirmation error: retry after purging the lease */
|
|
ssleep(1);
|
|
clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
|
|
break;
|
|
case -NFS4ERR_STALE_CLIENTID:
|
|
clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
|
|
nfs4_state_start_reclaim_reboot(clp);
|
|
break;
|
|
case -NFS4ERR_CLID_INUSE:
|
|
pr_err("NFS: Server %s reports our clientid is in use\n",
|
|
clp->cl_hostname);
|
|
nfs_mark_client_ready(clp, -EPERM);
|
|
clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
|
|
return -EPERM;
|
|
case -EACCES:
|
|
case -NFS4ERR_DELAY:
|
|
case -ETIMEDOUT:
|
|
case -EAGAIN:
|
|
ssleep(1);
|
|
break;
|
|
|
|
case -NFS4ERR_MINOR_VERS_MISMATCH:
|
|
if (clp->cl_cons_state == NFS_CS_SESSION_INITING)
|
|
nfs_mark_client_ready(clp, -EPROTONOSUPPORT);
|
|
dprintk("%s: exit with error %d for server %s\n",
|
|
__func__, -EPROTONOSUPPORT, clp->cl_hostname);
|
|
return -EPROTONOSUPPORT;
|
|
case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery
|
|
* in nfs4_exchange_id */
|
|
default:
|
|
dprintk("%s: exit with error %d for server %s\n", __func__,
|
|
status, clp->cl_hostname);
|
|
return status;
|
|
}
|
|
set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
|
|
dprintk("%s: handled error %d for server %s\n", __func__, status,
|
|
clp->cl_hostname);
|
|
return 0;
|
|
}
|
|
|
|
static int nfs4_establish_lease(struct nfs_client *clp)
|
|
{
|
|
struct rpc_cred *cred;
|
|
const struct nfs4_state_recovery_ops *ops =
|
|
clp->cl_mvops->reboot_recovery_ops;
|
|
int status;
|
|
|
|
nfs4_begin_drain_session(clp);
|
|
cred = nfs4_get_clid_cred(clp);
|
|
if (cred == NULL)
|
|
return -ENOENT;
|
|
status = ops->establish_clid(clp, cred);
|
|
put_rpccred(cred);
|
|
if (status != 0)
|
|
return status;
|
|
pnfs_destroy_all_layouts(clp);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Returns zero or a negative errno. NFS4ERR values are converted
|
|
* to local errno values.
|
|
*/
|
|
static int nfs4_reclaim_lease(struct nfs_client *clp)
|
|
{
|
|
int status;
|
|
|
|
status = nfs4_establish_lease(clp);
|
|
if (status < 0)
|
|
return nfs4_handle_reclaim_lease_error(clp, status);
|
|
if (test_and_clear_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state))
|
|
nfs4_state_start_reclaim_nograce(clp);
|
|
if (!test_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state))
|
|
set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
|
|
clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
|
|
clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
|
|
return 0;
|
|
}
|
|
|
|
static int nfs4_purge_lease(struct nfs_client *clp)
|
|
{
|
|
int status;
|
|
|
|
status = nfs4_establish_lease(clp);
|
|
if (status < 0)
|
|
return nfs4_handle_reclaim_lease_error(clp, status);
|
|
clear_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state);
|
|
set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
|
|
nfs4_state_start_reclaim_nograce(clp);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Try remote migration of one FSID from a source server to a
|
|
* destination server. The source server provides a list of
|
|
* potential destinations.
|
|
*
|
|
* Returns zero or a negative NFS4ERR status code.
|
|
*/
|
|
static int nfs4_try_migration(struct nfs_server *server, struct rpc_cred *cred)
|
|
{
|
|
struct nfs_client *clp = server->nfs_client;
|
|
struct nfs4_fs_locations *locations = NULL;
|
|
struct inode *inode;
|
|
struct page *page;
|
|
int status, result;
|
|
|
|
dprintk("--> %s: FSID %llx:%llx on \"%s\"\n", __func__,
|
|
(unsigned long long)server->fsid.major,
|
|
(unsigned long long)server->fsid.minor,
|
|
clp->cl_hostname);
|
|
|
|
result = 0;
|
|
page = alloc_page(GFP_KERNEL);
|
|
locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
|
|
if (page == NULL || locations == NULL) {
|
|
dprintk("<-- %s: no memory\n", __func__);
|
|
goto out;
|
|
}
|
|
|
|
inode = d_inode(server->super->s_root);
|
|
result = nfs4_proc_get_locations(inode, locations, page, cred);
|
|
if (result) {
|
|
dprintk("<-- %s: failed to retrieve fs_locations: %d\n",
|
|
__func__, result);
|
|
goto out;
|
|
}
|
|
|
|
result = -NFS4ERR_NXIO;
|
|
if (!(locations->fattr.valid & NFS_ATTR_FATTR_V4_LOCATIONS)) {
|
|
dprintk("<-- %s: No fs_locations data, migration skipped\n",
|
|
__func__);
|
|
goto out;
|
|
}
|
|
|
|
nfs4_begin_drain_session(clp);
|
|
|
|
status = nfs4_replace_transport(server, locations);
|
|
if (status != 0) {
|
|
dprintk("<-- %s: failed to replace transport: %d\n",
|
|
__func__, status);
|
|
goto out;
|
|
}
|
|
|
|
result = 0;
|
|
dprintk("<-- %s: migration succeeded\n", __func__);
|
|
|
|
out:
|
|
if (page != NULL)
|
|
__free_page(page);
|
|
kfree(locations);
|
|
if (result) {
|
|
pr_err("NFS: migration recovery failed (server %s)\n",
|
|
clp->cl_hostname);
|
|
set_bit(NFS_MIG_FAILED, &server->mig_status);
|
|
}
|
|
return result;
|
|
}
|
|
|
|
/*
|
|
* Returns zero or a negative NFS4ERR status code.
|
|
*/
|
|
static int nfs4_handle_migration(struct nfs_client *clp)
|
|
{
|
|
const struct nfs4_state_maintenance_ops *ops =
|
|
clp->cl_mvops->state_renewal_ops;
|
|
struct nfs_server *server;
|
|
struct rpc_cred *cred;
|
|
|
|
dprintk("%s: migration reported on \"%s\"\n", __func__,
|
|
clp->cl_hostname);
|
|
|
|
spin_lock(&clp->cl_lock);
|
|
cred = ops->get_state_renewal_cred_locked(clp);
|
|
spin_unlock(&clp->cl_lock);
|
|
if (cred == NULL)
|
|
return -NFS4ERR_NOENT;
|
|
|
|
clp->cl_mig_gen++;
|
|
restart:
|
|
rcu_read_lock();
|
|
list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
|
|
int status;
|
|
|
|
if (server->mig_gen == clp->cl_mig_gen)
|
|
continue;
|
|
server->mig_gen = clp->cl_mig_gen;
|
|
|
|
if (!test_and_clear_bit(NFS_MIG_IN_TRANSITION,
|
|
&server->mig_status))
|
|
continue;
|
|
|
|
rcu_read_unlock();
|
|
status = nfs4_try_migration(server, cred);
|
|
if (status < 0) {
|
|
put_rpccred(cred);
|
|
return status;
|
|
}
|
|
goto restart;
|
|
}
|
|
rcu_read_unlock();
|
|
put_rpccred(cred);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Test each nfs_server on the clp's cl_superblocks list to see
|
|
* if it's moved to another server. Stop when the server no longer
|
|
* returns NFS4ERR_LEASE_MOVED.
|
|
*/
|
|
static int nfs4_handle_lease_moved(struct nfs_client *clp)
|
|
{
|
|
const struct nfs4_state_maintenance_ops *ops =
|
|
clp->cl_mvops->state_renewal_ops;
|
|
struct nfs_server *server;
|
|
struct rpc_cred *cred;
|
|
|
|
dprintk("%s: lease moved reported on \"%s\"\n", __func__,
|
|
clp->cl_hostname);
|
|
|
|
spin_lock(&clp->cl_lock);
|
|
cred = ops->get_state_renewal_cred_locked(clp);
|
|
spin_unlock(&clp->cl_lock);
|
|
if (cred == NULL)
|
|
return -NFS4ERR_NOENT;
|
|
|
|
clp->cl_mig_gen++;
|
|
restart:
|
|
rcu_read_lock();
|
|
list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
|
|
struct inode *inode;
|
|
int status;
|
|
|
|
if (server->mig_gen == clp->cl_mig_gen)
|
|
continue;
|
|
server->mig_gen = clp->cl_mig_gen;
|
|
|
|
rcu_read_unlock();
|
|
|
|
inode = d_inode(server->super->s_root);
|
|
status = nfs4_proc_fsid_present(inode, cred);
|
|
if (status != -NFS4ERR_MOVED)
|
|
goto restart; /* wasn't this one */
|
|
if (nfs4_try_migration(server, cred) == -NFS4ERR_LEASE_MOVED)
|
|
goto restart; /* there are more */
|
|
goto out;
|
|
}
|
|
rcu_read_unlock();
|
|
|
|
out:
|
|
put_rpccred(cred);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* nfs4_discover_server_trunking - Detect server IP address trunking
|
|
*
|
|
* @clp: nfs_client under test
|
|
* @result: OUT: found nfs_client, or clp
|
|
*
|
|
* Returns zero or a negative errno. If zero is returned,
|
|
* an nfs_client pointer is planted in "result".
|
|
*
|
|
* Note: since we are invoked in process context, and
|
|
* not from inside the state manager, we cannot use
|
|
* nfs4_handle_reclaim_lease_error().
|
|
*/
|
|
int nfs4_discover_server_trunking(struct nfs_client *clp,
|
|
struct nfs_client **result)
|
|
{
|
|
const struct nfs4_state_recovery_ops *ops =
|
|
clp->cl_mvops->reboot_recovery_ops;
|
|
struct rpc_clnt *clnt;
|
|
struct rpc_cred *cred;
|
|
int i, status;
|
|
|
|
dprintk("NFS: %s: testing '%s'\n", __func__, clp->cl_hostname);
|
|
|
|
clnt = clp->cl_rpcclient;
|
|
i = 0;
|
|
|
|
mutex_lock(&nfs_clid_init_mutex);
|
|
again:
|
|
status = -ENOENT;
|
|
cred = nfs4_get_clid_cred(clp);
|
|
if (cred == NULL)
|
|
goto out_unlock;
|
|
|
|
status = ops->detect_trunking(clp, result, cred);
|
|
put_rpccred(cred);
|
|
switch (status) {
|
|
case 0:
|
|
break;
|
|
case -ETIMEDOUT:
|
|
if (clnt->cl_softrtry)
|
|
break;
|
|
case -NFS4ERR_DELAY:
|
|
case -EAGAIN:
|
|
ssleep(1);
|
|
case -NFS4ERR_STALE_CLIENTID:
|
|
dprintk("NFS: %s after status %d, retrying\n",
|
|
__func__, status);
|
|
goto again;
|
|
case -EACCES:
|
|
if (i++ == 0) {
|
|
nfs4_root_machine_cred(clp);
|
|
goto again;
|
|
}
|
|
if (clnt->cl_auth->au_flavor == RPC_AUTH_UNIX)
|
|
break;
|
|
case -NFS4ERR_CLID_INUSE:
|
|
case -NFS4ERR_WRONGSEC:
|
|
/* No point in retrying if we already used RPC_AUTH_UNIX */
|
|
if (clnt->cl_auth->au_flavor == RPC_AUTH_UNIX) {
|
|
status = -EPERM;
|
|
break;
|
|
}
|
|
clnt = rpc_clone_client_set_auth(clnt, RPC_AUTH_UNIX);
|
|
if (IS_ERR(clnt)) {
|
|
status = PTR_ERR(clnt);
|
|
break;
|
|
}
|
|
/* Note: this is safe because we haven't yet marked the
|
|
* client as ready, so we are the only user of
|
|
* clp->cl_rpcclient
|
|
*/
|
|
clnt = xchg(&clp->cl_rpcclient, clnt);
|
|
rpc_shutdown_client(clnt);
|
|
clnt = clp->cl_rpcclient;
|
|
goto again;
|
|
|
|
case -NFS4ERR_MINOR_VERS_MISMATCH:
|
|
status = -EPROTONOSUPPORT;
|
|
break;
|
|
|
|
case -EKEYEXPIRED:
|
|
case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery
|
|
* in nfs4_exchange_id */
|
|
status = -EKEYEXPIRED;
|
|
break;
|
|
default:
|
|
pr_warn("NFS: %s unhandled error %d. Exiting with error EIO\n",
|
|
__func__, status);
|
|
status = -EIO;
|
|
}
|
|
|
|
out_unlock:
|
|
mutex_unlock(&nfs_clid_init_mutex);
|
|
dprintk("NFS: %s: status = %d\n", __func__, status);
|
|
return status;
|
|
}
|
|
|
|
#ifdef CONFIG_NFS_V4_1
|
|
void nfs4_schedule_session_recovery(struct nfs4_session *session, int err)
|
|
{
|
|
struct nfs_client *clp = session->clp;
|
|
|
|
switch (err) {
|
|
default:
|
|
set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
|
|
break;
|
|
case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
|
|
set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
|
|
}
|
|
nfs4_schedule_lease_recovery(clp);
|
|
}
|
|
EXPORT_SYMBOL_GPL(nfs4_schedule_session_recovery);
|
|
|
|
void nfs41_notify_server(struct nfs_client *clp)
|
|
{
|
|
/* Use CHECK_LEASE to ping the server with a SEQUENCE */
|
|
set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
|
|
nfs4_schedule_state_manager(clp);
|
|
}
|
|
|
|
static void nfs4_reset_all_state(struct nfs_client *clp)
|
|
{
|
|
if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) {
|
|
set_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state);
|
|
clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
|
|
nfs4_state_start_reclaim_nograce(clp);
|
|
dprintk("%s: scheduling reset of all state for server %s!\n",
|
|
__func__, clp->cl_hostname);
|
|
nfs4_schedule_state_manager(clp);
|
|
}
|
|
}
|
|
|
|
static void nfs41_handle_server_reboot(struct nfs_client *clp)
|
|
{
|
|
if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) {
|
|
nfs4_state_start_reclaim_reboot(clp);
|
|
dprintk("%s: server %s rebooted!\n", __func__,
|
|
clp->cl_hostname);
|
|
nfs4_schedule_state_manager(clp);
|
|
}
|
|
}
|
|
|
|
static void nfs41_handle_all_state_revoked(struct nfs_client *clp)
|
|
{
|
|
nfs4_reset_all_state(clp);
|
|
dprintk("%s: state revoked on server %s\n", __func__, clp->cl_hostname);
|
|
}
|
|
|
|
static void nfs41_handle_some_state_revoked(struct nfs_client *clp)
|
|
{
|
|
nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_nograce);
|
|
nfs4_schedule_state_manager(clp);
|
|
|
|
dprintk("%s: state revoked on server %s\n", __func__, clp->cl_hostname);
|
|
}
|
|
|
|
static void nfs41_handle_recallable_state_revoked(struct nfs_client *clp)
|
|
{
|
|
/* FIXME: For now, we destroy all layouts. */
|
|
pnfs_destroy_all_layouts(clp);
|
|
/* FIXME: For now, we test all delegations+open state+locks. */
|
|
nfs41_handle_some_state_revoked(clp);
|
|
dprintk("%s: Recallable state revoked on server %s!\n", __func__,
|
|
clp->cl_hostname);
|
|
}
|
|
|
|
static void nfs41_handle_backchannel_fault(struct nfs_client *clp)
|
|
{
|
|
set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
|
|
nfs4_schedule_state_manager(clp);
|
|
|
|
dprintk("%s: server %s declared a backchannel fault\n", __func__,
|
|
clp->cl_hostname);
|
|
}
|
|
|
|
static void nfs41_handle_cb_path_down(struct nfs_client *clp)
|
|
{
|
|
if (test_and_set_bit(NFS4CLNT_BIND_CONN_TO_SESSION,
|
|
&clp->cl_state) == 0)
|
|
nfs4_schedule_state_manager(clp);
|
|
}
|
|
|
|
void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags)
|
|
{
|
|
if (!flags)
|
|
return;
|
|
|
|
dprintk("%s: \"%s\" (client ID %llx) flags=0x%08x\n",
|
|
__func__, clp->cl_hostname, clp->cl_clientid, flags);
|
|
|
|
if (flags & SEQ4_STATUS_RESTART_RECLAIM_NEEDED)
|
|
nfs41_handle_server_reboot(clp);
|
|
if (flags & (SEQ4_STATUS_EXPIRED_ALL_STATE_REVOKED))
|
|
nfs41_handle_all_state_revoked(clp);
|
|
if (flags & (SEQ4_STATUS_EXPIRED_SOME_STATE_REVOKED |
|
|
SEQ4_STATUS_ADMIN_STATE_REVOKED))
|
|
nfs41_handle_some_state_revoked(clp);
|
|
if (flags & SEQ4_STATUS_LEASE_MOVED)
|
|
nfs4_schedule_lease_moved_recovery(clp);
|
|
if (flags & SEQ4_STATUS_RECALLABLE_STATE_REVOKED)
|
|
nfs41_handle_recallable_state_revoked(clp);
|
|
if (flags & SEQ4_STATUS_BACKCHANNEL_FAULT)
|
|
nfs41_handle_backchannel_fault(clp);
|
|
else if (flags & (SEQ4_STATUS_CB_PATH_DOWN |
|
|
SEQ4_STATUS_CB_PATH_DOWN_SESSION))
|
|
nfs41_handle_cb_path_down(clp);
|
|
}
|
|
|
|
static int nfs4_reset_session(struct nfs_client *clp)
|
|
{
|
|
struct rpc_cred *cred;
|
|
int status;
|
|
|
|
if (!nfs4_has_session(clp))
|
|
return 0;
|
|
nfs4_begin_drain_session(clp);
|
|
cred = nfs4_get_clid_cred(clp);
|
|
status = nfs4_proc_destroy_session(clp->cl_session, cred);
|
|
switch (status) {
|
|
case 0:
|
|
case -NFS4ERR_BADSESSION:
|
|
case -NFS4ERR_DEADSESSION:
|
|
break;
|
|
case -NFS4ERR_BACK_CHAN_BUSY:
|
|
case -NFS4ERR_DELAY:
|
|
set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
|
|
status = 0;
|
|
ssleep(1);
|
|
goto out;
|
|
default:
|
|
status = nfs4_recovery_handle_error(clp, status);
|
|
goto out;
|
|
}
|
|
|
|
memset(clp->cl_session->sess_id.data, 0, NFS4_MAX_SESSIONID_LEN);
|
|
status = nfs4_proc_create_session(clp, cred);
|
|
if (status) {
|
|
dprintk("%s: session reset failed with status %d for server %s!\n",
|
|
__func__, status, clp->cl_hostname);
|
|
status = nfs4_handle_reclaim_lease_error(clp, status);
|
|
goto out;
|
|
}
|
|
nfs41_finish_session_reset(clp);
|
|
dprintk("%s: session reset was successful for server %s!\n",
|
|
__func__, clp->cl_hostname);
|
|
out:
|
|
if (cred)
|
|
put_rpccred(cred);
|
|
return status;
|
|
}
|
|
|
|
static int nfs4_bind_conn_to_session(struct nfs_client *clp)
|
|
{
|
|
struct rpc_cred *cred;
|
|
int ret;
|
|
|
|
if (!nfs4_has_session(clp))
|
|
return 0;
|
|
nfs4_begin_drain_session(clp);
|
|
cred = nfs4_get_clid_cred(clp);
|
|
ret = nfs4_proc_bind_conn_to_session(clp, cred);
|
|
if (cred)
|
|
put_rpccred(cred);
|
|
clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
|
|
switch (ret) {
|
|
case 0:
|
|
dprintk("%s: bind_conn_to_session was successful for server %s!\n",
|
|
__func__, clp->cl_hostname);
|
|
break;
|
|
case -NFS4ERR_DELAY:
|
|
ssleep(1);
|
|
set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
|
|
break;
|
|
default:
|
|
return nfs4_recovery_handle_error(clp, ret);
|
|
}
|
|
return 0;
|
|
}
|
|
#else /* CONFIG_NFS_V4_1 */
|
|
static int nfs4_reset_session(struct nfs_client *clp) { return 0; }
|
|
|
|
static int nfs4_bind_conn_to_session(struct nfs_client *clp)
|
|
{
|
|
return 0;
|
|
}
|
|
#endif /* CONFIG_NFS_V4_1 */
|
|
|
|
static void nfs4_state_manager(struct nfs_client *clp)
|
|
{
|
|
int status = 0;
|
|
const char *section = "", *section_sep = "";
|
|
|
|
/* Ensure exclusive access to NFSv4 state */
|
|
do {
|
|
if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
|
|
section = "purge state";
|
|
status = nfs4_purge_lease(clp);
|
|
if (status < 0)
|
|
goto out_error;
|
|
continue;
|
|
}
|
|
|
|
if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) {
|
|
section = "lease expired";
|
|
/* We're going to have to re-establish a clientid */
|
|
status = nfs4_reclaim_lease(clp);
|
|
if (status < 0)
|
|
goto out_error;
|
|
continue;
|
|
}
|
|
|
|
/* Initialize or reset the session */
|
|
if (test_and_clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state)) {
|
|
section = "reset session";
|
|
status = nfs4_reset_session(clp);
|
|
if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
|
|
continue;
|
|
if (status < 0)
|
|
goto out_error;
|
|
}
|
|
|
|
/* Send BIND_CONN_TO_SESSION */
|
|
if (test_and_clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION,
|
|
&clp->cl_state)) {
|
|
section = "bind conn to session";
|
|
status = nfs4_bind_conn_to_session(clp);
|
|
if (status < 0)
|
|
goto out_error;
|
|
continue;
|
|
}
|
|
|
|
if (test_and_clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state)) {
|
|
section = "check lease";
|
|
status = nfs4_check_lease(clp);
|
|
if (status < 0)
|
|
goto out_error;
|
|
continue;
|
|
}
|
|
|
|
if (test_and_clear_bit(NFS4CLNT_MOVED, &clp->cl_state)) {
|
|
section = "migration";
|
|
status = nfs4_handle_migration(clp);
|
|
if (status < 0)
|
|
goto out_error;
|
|
}
|
|
|
|
if (test_and_clear_bit(NFS4CLNT_LEASE_MOVED, &clp->cl_state)) {
|
|
section = "lease moved";
|
|
status = nfs4_handle_lease_moved(clp);
|
|
if (status < 0)
|
|
goto out_error;
|
|
}
|
|
|
|
/* First recover reboot state... */
|
|
if (test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) {
|
|
section = "reclaim reboot";
|
|
status = nfs4_do_reclaim(clp,
|
|
clp->cl_mvops->reboot_recovery_ops);
|
|
if (status == -EAGAIN)
|
|
continue;
|
|
if (status < 0)
|
|
goto out_error;
|
|
nfs4_state_end_reclaim_reboot(clp);
|
|
}
|
|
|
|
/* Now recover expired state... */
|
|
if (test_and_clear_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state)) {
|
|
section = "reclaim nograce";
|
|
status = nfs4_do_reclaim(clp,
|
|
clp->cl_mvops->nograce_recovery_ops);
|
|
if (status == -EAGAIN)
|
|
continue;
|
|
if (status < 0)
|
|
goto out_error;
|
|
}
|
|
|
|
nfs4_end_drain_session(clp);
|
|
if (test_and_clear_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state)) {
|
|
nfs_client_return_marked_delegations(clp);
|
|
continue;
|
|
}
|
|
|
|
nfs4_clear_state_manager_bit(clp);
|
|
/* Did we race with an attempt to give us more work? */
|
|
if (clp->cl_state == 0)
|
|
break;
|
|
if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0)
|
|
break;
|
|
} while (atomic_read(&clp->cl_count) > 1);
|
|
return;
|
|
out_error:
|
|
if (strlen(section))
|
|
section_sep = ": ";
|
|
pr_warn_ratelimited("NFS: state manager%s%s failed on NFSv4 server %s"
|
|
" with error %d\n", section_sep, section,
|
|
clp->cl_hostname, -status);
|
|
ssleep(1);
|
|
nfs4_end_drain_session(clp);
|
|
nfs4_clear_state_manager_bit(clp);
|
|
}
|
|
|
|
static int nfs4_run_state_manager(void *ptr)
|
|
{
|
|
struct nfs_client *clp = ptr;
|
|
|
|
allow_signal(SIGKILL);
|
|
nfs4_state_manager(clp);
|
|
nfs_put_client(clp);
|
|
module_put_and_exit(0);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Local variables:
|
|
* c-basic-offset: 8
|
|
* End:
|
|
*/
|