![Andy Adamson](/assets/img/avatar_default.png)
Use our own async error handler. Mark the layout as failed and retry i/o through the MDS on specified errors. Update the mds_offset in nfs_readpage_retry so that a failed short-read retry to a DS gets correctly resent through the MDS. Signed-off-by: Andy Adamson <andros@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
1718 lines
45 KiB
C
1718 lines
45 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/nfs_idmap.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 "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 "pnfs.h"
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#define OPENOWNER_POOL_SIZE 8
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const nfs4_stateid zero_stateid;
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static LIST_HEAD(nfs4_clientid_list);
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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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unsigned short port;
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int status;
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port = nfs_callback_tcpport;
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if (clp->cl_addr.ss_family == AF_INET6)
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port = 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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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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clp->cl_clientid = clid.clientid;
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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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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_clear_machine_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 = clp->cl_machine_cred;
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clp->cl_machine_cred = NULL;
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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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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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return cred;
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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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/*
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* Back channel returns NFS4ERR_DELAY for new requests when
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* NFS4_SESSION_DRAINING is set so there is no work to be done when draining
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* is ended.
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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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int max_slots;
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if (ses == NULL)
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return;
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if (test_and_clear_bit(NFS4_SESSION_DRAINING, &ses->session_state)) {
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spin_lock(&ses->fc_slot_table.slot_tbl_lock);
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max_slots = ses->fc_slot_table.max_slots;
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while (max_slots--) {
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struct rpc_task *task;
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task = rpc_wake_up_next(&ses->fc_slot_table.
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slot_tbl_waitq);
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if (!task)
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break;
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rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
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}
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spin_unlock(&ses->fc_slot_table.slot_tbl_lock);
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}
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}
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static int nfs4_wait_on_slot_tbl(struct nfs4_slot_table *tbl)
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{
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spin_lock(&tbl->slot_tbl_lock);
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if (tbl->highest_used_slotid != -1) {
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INIT_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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set_bit(NFS4_SESSION_DRAINING, &ses->session_state);
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/* back channel */
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ret = nfs4_wait_on_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_wait_on_slot_tbl(&ses->fc_slot_table);
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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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nfs4_begin_drain_session(clp);
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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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status = nfs4_proc_create_session(clp);
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if (status != 0)
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goto out;
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nfs41_setup_state_renewal(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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struct rpc_cred *nfs4_get_exchange_id_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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#endif /* CONFIG_NFS_V4_1 */
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static struct rpc_cred *
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nfs4_get_setclientid_cred_server(struct nfs_server *server)
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{
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struct nfs_client *clp = server->nfs_client;
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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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spin_lock(&clp->cl_lock);
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pos = rb_first(&server->state_owners);
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if (pos != NULL) {
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sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
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cred = get_rpccred(sp->so_cred);
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}
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spin_unlock(&clp->cl_lock);
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return cred;
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}
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/**
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* nfs4_get_setclientid_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_setclientid_cred(struct nfs_client *clp)
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{
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struct nfs_server *server;
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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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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_setclientid_cred_server(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 nfs_alloc_unique_id_locked(struct rb_root *root,
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struct nfs_unique_id *new,
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__u64 minval, int maxbits)
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{
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struct rb_node **p, *parent;
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struct nfs_unique_id *pos;
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__u64 mask = ~0ULL;
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if (maxbits < 64)
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mask = (1ULL << maxbits) - 1ULL;
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/* Ensure distribution is more or less flat */
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get_random_bytes(&new->id, sizeof(new->id));
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new->id &= mask;
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if (new->id < minval)
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new->id += minval;
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retry:
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p = &root->rb_node;
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parent = NULL;
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while (*p != NULL) {
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parent = *p;
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pos = rb_entry(parent, struct nfs_unique_id, rb_node);
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if (new->id < pos->id)
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p = &(*p)->rb_left;
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else if (new->id > pos->id)
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p = &(*p)->rb_right;
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else
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goto id_exists;
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}
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rb_link_node(&new->rb_node, parent, p);
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rb_insert_color(&new->rb_node, root);
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return;
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id_exists:
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for (;;) {
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new->id++;
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if (new->id < minval || (new->id & mask) != new->id) {
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new->id = minval;
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break;
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}
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parent = rb_next(parent);
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if (parent == NULL)
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break;
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pos = rb_entry(parent, struct nfs_unique_id, rb_node);
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if (new->id < pos->id)
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break;
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}
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goto retry;
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}
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static void nfs_free_unique_id(struct rb_root *root, struct nfs_unique_id *id)
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{
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rb_erase(&id->rb_node, root);
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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, *res = NULL;
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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 (server < sp->so_server) {
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p = &parent->rb_left;
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continue;
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}
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if (server > sp->so_server) {
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p = &parent->rb_right;
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continue;
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}
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if (cred < sp->so_cred)
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p = &parent->rb_left;
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else if (cred > sp->so_cred)
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p = &parent->rb_right;
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else {
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atomic_inc(&sp->so_count);
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res = sp;
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break;
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}
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}
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return res;
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}
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static struct nfs4_state_owner *
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nfs4_insert_state_owner_locked(struct nfs4_state_owner *new)
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{
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struct nfs_server *server = new->so_server;
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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 (new->so_cred < sp->so_cred)
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p = &parent->rb_left;
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else if (new->so_cred > sp->so_cred)
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p = &parent->rb_right;
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else {
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atomic_inc(&sp->so_count);
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return sp;
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}
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}
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nfs_alloc_unique_id_locked(&server->openowner_id,
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&new->so_owner_id, 1, 64);
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rb_link_node(&new->so_server_node, parent, p);
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rb_insert_color(&new->so_server_node, &server->state_owners);
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return new;
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}
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static void
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nfs4_remove_state_owner_locked(struct nfs4_state_owner *sp)
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{
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struct nfs_server *server = sp->so_server;
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if (!RB_EMPTY_NODE(&sp->so_server_node))
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rb_erase(&sp->so_server_node, &server->state_owners);
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nfs_free_unique_id(&server->openowner_id, &sp->so_owner_id);
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}
|
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|
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/*
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* nfs4_alloc_state_owner(): this is called on the OPEN or CREATE path to
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* create a new state_owner.
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*
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*/
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static struct nfs4_state_owner *
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nfs4_alloc_state_owner(void)
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{
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struct nfs4_state_owner *sp;
|
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|
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sp = kzalloc(sizeof(*sp),GFP_NOFS);
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if (!sp)
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return NULL;
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spin_lock_init(&sp->so_lock);
|
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INIT_LIST_HEAD(&sp->so_states);
|
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rpc_init_wait_queue(&sp->so_sequence.wait, "Seqid_waitqueue");
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sp->so_seqid.sequence = &sp->so_sequence;
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spin_lock_init(&sp->so_sequence.lock);
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INIT_LIST_HEAD(&sp->so_sequence.list);
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atomic_set(&sp->so_count, 1);
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return sp;
|
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}
|
|
|
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static void
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nfs4_drop_state_owner(struct nfs4_state_owner *sp)
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{
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if (!RB_EMPTY_NODE(&sp->so_server_node)) {
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struct nfs_server *server = sp->so_server;
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struct nfs_client *clp = server->nfs_client;
|
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|
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spin_lock(&clp->cl_lock);
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rb_erase(&sp->so_server_node, &server->state_owners);
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RB_CLEAR_NODE(&sp->so_server_node);
|
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spin_unlock(&clp->cl_lock);
|
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}
|
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}
|
|
|
|
/**
|
|
* nfs4_get_state_owner - Look up a state owner given a credential
|
|
* @server: nfs_server to search
|
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* @cred: RPC credential to match
|
|
*
|
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* Returns a pointer to an instantiated nfs4_state_owner struct, or NULL.
|
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*/
|
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struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *server,
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struct rpc_cred *cred)
|
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{
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struct nfs_client *clp = server->nfs_client;
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struct nfs4_state_owner *sp, *new;
|
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|
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spin_lock(&clp->cl_lock);
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sp = nfs4_find_state_owner_locked(server, cred);
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spin_unlock(&clp->cl_lock);
|
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if (sp != NULL)
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return sp;
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new = nfs4_alloc_state_owner();
|
|
if (new == NULL)
|
|
return NULL;
|
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new->so_server = server;
|
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new->so_cred = cred;
|
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spin_lock(&clp->cl_lock);
|
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sp = nfs4_insert_state_owner_locked(new);
|
|
spin_unlock(&clp->cl_lock);
|
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if (sp == new)
|
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get_rpccred(cred);
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else {
|
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rpc_destroy_wait_queue(&new->so_sequence.wait);
|
|
kfree(new);
|
|
}
|
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return sp;
|
|
}
|
|
|
|
/**
|
|
* nfs4_put_state_owner - Release a nfs4_state_owner
|
|
* @sp: state owner data to release
|
|
*
|
|
*/
|
|
void nfs4_put_state_owner(struct nfs4_state_owner *sp)
|
|
{
|
|
struct nfs_client *clp = sp->so_server->nfs_client;
|
|
struct rpc_cred *cred = sp->so_cred;
|
|
|
|
if (!atomic_dec_and_lock(&sp->so_count, &clp->cl_lock))
|
|
return;
|
|
nfs4_remove_state_owner_locked(sp);
|
|
spin_unlock(&clp->cl_lock);
|
|
rpc_destroy_wait_queue(&sp->so_sequence.wait);
|
|
put_rpccred(cred);
|
|
kfree(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 (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);
|
|
state->inode = igrab(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 path *path, 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 {
|
|
bool roc = pnfs_roc(state->inode);
|
|
|
|
nfs4_do_close(path, state, gfp_mask, wait, roc);
|
|
}
|
|
}
|
|
|
|
void nfs4_close_state(struct path *path, struct nfs4_state *state, fmode_t fmode)
|
|
{
|
|
__nfs4_close(path, state, fmode, GFP_NOFS, 0);
|
|
}
|
|
|
|
void nfs4_close_sync(struct path *path, struct nfs4_state *state, fmode_t fmode)
|
|
{
|
|
__nfs4_close(path, 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, pid_t fl_pid, unsigned int type)
|
|
{
|
|
struct nfs4_lock_state *pos;
|
|
list_for_each_entry(pos, &state->lock_states, ls_locks) {
|
|
if (type != NFS4_ANY_LOCK_TYPE && pos->ls_owner.lo_type != type)
|
|
continue;
|
|
switch (pos->ls_owner.lo_type) {
|
|
case NFS4_POSIX_LOCK_TYPE:
|
|
if (pos->ls_owner.lo_u.posix_owner != fl_owner)
|
|
continue;
|
|
break;
|
|
case NFS4_FLOCK_LOCK_TYPE:
|
|
if (pos->ls_owner.lo_u.flock_owner != fl_pid)
|
|
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, pid_t fl_pid, unsigned int type)
|
|
{
|
|
struct nfs4_lock_state *lsp;
|
|
struct nfs_server *server = state->owner->so_server;
|
|
struct nfs_client *clp = server->nfs_client;
|
|
|
|
lsp = kzalloc(sizeof(*lsp), GFP_NOFS);
|
|
if (lsp == NULL)
|
|
return NULL;
|
|
rpc_init_wait_queue(&lsp->ls_sequence.wait, "lock_seqid_waitqueue");
|
|
spin_lock_init(&lsp->ls_sequence.lock);
|
|
INIT_LIST_HEAD(&lsp->ls_sequence.list);
|
|
lsp->ls_seqid.sequence = &lsp->ls_sequence;
|
|
atomic_set(&lsp->ls_count, 1);
|
|
lsp->ls_state = state;
|
|
lsp->ls_owner.lo_type = type;
|
|
switch (lsp->ls_owner.lo_type) {
|
|
case NFS4_FLOCK_LOCK_TYPE:
|
|
lsp->ls_owner.lo_u.flock_owner = fl_pid;
|
|
break;
|
|
case NFS4_POSIX_LOCK_TYPE:
|
|
lsp->ls_owner.lo_u.posix_owner = fl_owner;
|
|
break;
|
|
default:
|
|
kfree(lsp);
|
|
return NULL;
|
|
}
|
|
spin_lock(&clp->cl_lock);
|
|
nfs_alloc_unique_id_locked(&server->lockowner_id, &lsp->ls_id, 1, 64);
|
|
spin_unlock(&clp->cl_lock);
|
|
INIT_LIST_HEAD(&lsp->ls_locks);
|
|
return lsp;
|
|
}
|
|
|
|
static void nfs4_free_lock_state(struct nfs4_lock_state *lsp)
|
|
{
|
|
struct nfs_server *server = lsp->ls_state->owner->so_server;
|
|
struct nfs_client *clp = server->nfs_client;
|
|
|
|
spin_lock(&clp->cl_lock);
|
|
nfs_free_unique_id(&server->lockowner_id, &lsp->ls_id);
|
|
spin_unlock(&clp->cl_lock);
|
|
rpc_destroy_wait_queue(&lsp->ls_sequence.wait);
|
|
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, pid_t pid, unsigned int type)
|
|
{
|
|
struct nfs4_lock_state *lsp, *new = NULL;
|
|
|
|
for(;;) {
|
|
spin_lock(&state->state_lock);
|
|
lsp = __nfs4_find_lock_state(state, owner, pid, type);
|
|
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, pid, type);
|
|
if (new == NULL)
|
|
return NULL;
|
|
}
|
|
spin_unlock(&state->state_lock);
|
|
if (new != NULL)
|
|
nfs4_free_lock_state(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 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);
|
|
if (lsp->ls_flags & NFS_LOCK_INITIALIZED)
|
|
nfs4_release_lockowner(lsp);
|
|
nfs4_free_lock_state(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;
|
|
if (fl->fl_flags & FL_POSIX)
|
|
lsp = nfs4_get_lock_state(state, fl->fl_owner, 0, NFS4_POSIX_LOCK_TYPE);
|
|
else if (fl->fl_flags & FL_FLOCK)
|
|
lsp = nfs4_get_lock_state(state, 0, fl->fl_pid, NFS4_FLOCK_LOCK_TYPE);
|
|
else
|
|
return -EINVAL;
|
|
if (lsp == NULL)
|
|
return -ENOMEM;
|
|
fl->fl_u.nfs4_fl.owner = lsp;
|
|
fl->fl_ops = &nfs4_fl_lock_ops;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Byte-range lock aware utility to initialize the stateid of read/write
|
|
* requests.
|
|
*/
|
|
void nfs4_copy_stateid(nfs4_stateid *dst, struct nfs4_state *state, fl_owner_t fl_owner, pid_t fl_pid)
|
|
{
|
|
struct nfs4_lock_state *lsp;
|
|
int seq;
|
|
|
|
do {
|
|
seq = read_seqbegin(&state->seqlock);
|
|
memcpy(dst, &state->stateid, sizeof(*dst));
|
|
} while (read_seqretry(&state->seqlock, seq));
|
|
if (test_bit(LK_STATE_IN_USE, &state->flags) == 0)
|
|
return;
|
|
|
|
spin_lock(&state->state_lock);
|
|
lsp = __nfs4_find_lock_state(state, fl_owner, fl_pid, NFS4_ANY_LOCK_TYPE);
|
|
if (lsp != NULL && (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0)
|
|
memcpy(dst, &lsp->ls_stateid, sizeof(*dst));
|
|
spin_unlock(&state->state_lock);
|
|
nfs4_put_lock_state(lsp);
|
|
}
|
|
|
|
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) {
|
|
new->sequence = counter;
|
|
INIT_LIST_HEAD(&new->list);
|
|
}
|
|
return new;
|
|
}
|
|
|
|
void nfs_release_seqid(struct nfs_seqid *seqid)
|
|
{
|
|
if (!list_empty(&seqid->list)) {
|
|
struct rpc_sequence *sequence = seqid->sequence->sequence;
|
|
|
|
spin_lock(&sequence->lock);
|
|
list_del_init(&seqid->list);
|
|
spin_unlock(&sequence->lock);
|
|
rpc_wake_up(&sequence->wait);
|
|
}
|
|
}
|
|
|
|
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 nfs_fs.h:seqid_mutating_error()
|
|
*/
|
|
static void nfs_increment_seqid(int status, struct nfs_seqid *seqid)
|
|
{
|
|
BUG_ON(list_first_entry(&seqid->sequence->sequence->list, struct nfs_seqid, list) != seqid);
|
|
switch (status) {
|
|
case 0:
|
|
break;
|
|
case -NFS4ERR_BAD_SEQID:
|
|
if (seqid->sequence->flags & NFS_SEQID_CONFIRMED)
|
|
return;
|
|
printk(KERN_WARNING "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 = container_of(seqid->sequence,
|
|
struct nfs4_state_owner, so_seqid);
|
|
struct nfs_server *server = sp->so_server;
|
|
|
|
if (status == -NFS4ERR_BAD_SEQID)
|
|
nfs4_drop_state_owner(sp);
|
|
if (!nfs4_has_session(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 nfs_fs.h:seqid_mutating_error()
|
|
*/
|
|
void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid)
|
|
{
|
|
nfs_increment_seqid(status, seqid);
|
|
}
|
|
|
|
int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task)
|
|
{
|
|
struct rpc_sequence *sequence = seqid->sequence->sequence;
|
|
int status = 0;
|
|
|
|
spin_lock(&sequence->lock);
|
|
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);
|
|
return status;
|
|
}
|
|
|
|
static int nfs4_run_state_manager(void *);
|
|
|
|
static void nfs4_clear_state_manager_bit(struct nfs_client *clp)
|
|
{
|
|
smp_mb__before_clear_bit();
|
|
clear_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state);
|
|
smp_mb__after_clear_bit();
|
|
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;
|
|
|
|
if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0)
|
|
return;
|
|
__module_get(THIS_MODULE);
|
|
atomic_inc(&clp->cl_count);
|
|
task = kthread_run(nfs4_run_state_manager, clp, "%s-manager",
|
|
rpc_peeraddr2str(clp->cl_rpcclient,
|
|
RPC_DISPLAY_ADDR));
|
|
if (!IS_ERR(task))
|
|
return;
|
|
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);
|
|
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;
|
|
}
|
|
|
|
static 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;
|
|
}
|
|
|
|
void nfs4_schedule_stateid_recovery(const struct nfs_server *server, struct nfs4_state *state)
|
|
{
|
|
struct nfs_client *clp = server->nfs_client;
|
|
|
|
nfs4_state_mark_reclaim_nograce(clp, state);
|
|
nfs4_schedule_state_manager(clp);
|
|
}
|
|
|
|
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;
|
|
|
|
if (inode->i_flock == NULL)
|
|
return 0;
|
|
|
|
/* Guard against delegation returns and new lock/unlock calls */
|
|
down_write(&nfsi->rwsem);
|
|
/* Protect inode->i_flock using the BKL */
|
|
lock_flocks();
|
|
for (fl = inode->i_flock; fl != NULL; fl = fl->fl_next) {
|
|
if (!(fl->fl_flags & (FL_POSIX|FL_FLOCK)))
|
|
continue;
|
|
if (nfs_file_open_context(fl->fl_file)->state != state)
|
|
continue;
|
|
unlock_flocks();
|
|
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:
|
|
printk(KERN_ERR "%s: unhandled error %d. Zeroing state\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;
|
|
}
|
|
lock_flocks();
|
|
}
|
|
unlock_flocks();
|
|
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.
|
|
*/
|
|
restart:
|
|
spin_lock(&sp->so_lock);
|
|
list_for_each_entry(state, &sp->so_states, open_states) {
|
|
if (!test_and_clear_bit(ops->state_flag_bit, &state->flags))
|
|
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) {
|
|
list_for_each_entry(lock, &state->lock_states, ls_locks) {
|
|
if (!(lock->ls_flags & NFS_LOCK_INITIALIZED))
|
|
printk("%s: Lock reclaim failed!\n",
|
|
__func__);
|
|
}
|
|
nfs4_put_open_state(state);
|
|
goto restart;
|
|
}
|
|
}
|
|
switch (status) {
|
|
default:
|
|
printk(KERN_ERR "%s: unhandled error %d. Zeroing state\n",
|
|
__func__, status);
|
|
case -ENOENT:
|
|
case -ENOMEM:
|
|
case -ESTALE:
|
|
/*
|
|
* Open state on this file cannot be recovered
|
|
* All we can do is revert to using the zero stateid.
|
|
*/
|
|
memset(state->stateid.data, 0,
|
|
sizeof(state->stateid.data));
|
|
/* Mark the file as being 'closed' */
|
|
state->state = 0;
|
|
break;
|
|
case -EKEYEXPIRED:
|
|
/*
|
|
* User RPCSEC_GSS context has expired.
|
|
* We cannot recover this stateid now, so
|
|
* skip it and allow recovery thread to
|
|
* proceed.
|
|
*/
|
|
break;
|
|
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);
|
|
goto restart;
|
|
}
|
|
spin_unlock(&sp->so_lock);
|
|
return 0;
|
|
out_err:
|
|
nfs4_put_open_state(state);
|
|
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);
|
|
list_for_each_entry(lock, &state->lock_states, ls_locks) {
|
|
lock->ls_seqid.flags = 0;
|
|
lock->ls_flags &= ~NFS_LOCK_INITIALIZED;
|
|
}
|
|
}
|
|
|
|
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)
|
|
{
|
|
/* Notify the server we're done reclaiming our state */
|
|
if (ops->reclaim_complete)
|
|
(void)ops->reclaim_complete(clp);
|
|
}
|
|
|
|
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)
|
|
{
|
|
if (!nfs4_state_clear_reclaim_reboot(clp))
|
|
return;
|
|
nfs4_reclaim_complete(clp, clp->cl_mvops->reboot_recovery_ops);
|
|
}
|
|
|
|
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 void nfs4_warn_keyexpired(const char *s)
|
|
{
|
|
printk_ratelimited(KERN_WARNING "Error: state manager"
|
|
" encountered RPCSEC_GSS session"
|
|
" expired against NFSv4 server %s.\n",
|
|
s);
|
|
}
|
|
|
|
static int nfs4_recovery_handle_error(struct nfs_client *clp, int error)
|
|
{
|
|
switch (error) {
|
|
case -NFS4ERR_CB_PATH_DOWN:
|
|
nfs_handle_cb_pathdown(clp);
|
|
return 0;
|
|
case -NFS4ERR_NO_GRACE:
|
|
nfs4_state_end_reclaim_reboot(clp);
|
|
return 0;
|
|
case -NFS4ERR_STALE_CLIENTID:
|
|
case -NFS4ERR_LEASE_MOVED:
|
|
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_CONN_NOT_BOUND_TO_SESSION:
|
|
case -NFS4ERR_SEQ_FALSE_RETRY:
|
|
case -NFS4ERR_SEQ_MISORDERED:
|
|
set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
|
|
/* Zero session reset errors */
|
|
return 0;
|
|
case -EKEYEXPIRED:
|
|
/* Nothing we can do */
|
|
nfs4_warn_keyexpired(clp->cl_hostname);
|
|
return 0;
|
|
}
|
|
return error;
|
|
}
|
|
|
|
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) {
|
|
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;
|
|
atomic_inc(&sp->so_count);
|
|
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);
|
|
return nfs4_recovery_handle_error(clp, status);
|
|
}
|
|
|
|
nfs4_put_state_owner(sp);
|
|
goto restart;
|
|
}
|
|
spin_unlock(&clp->cl_lock);
|
|
}
|
|
rcu_read_unlock();
|
|
return status;
|
|
}
|
|
|
|
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 = -NFS4ERR_EXPIRED;
|
|
|
|
/* 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_setclientid_cred(clp);
|
|
if (cred == NULL)
|
|
goto out;
|
|
}
|
|
status = ops->renew_lease(clp, cred);
|
|
put_rpccred(cred);
|
|
out:
|
|
return nfs4_recovery_handle_error(clp, status);
|
|
}
|
|
|
|
static int nfs4_reclaim_lease(struct nfs_client *clp)
|
|
{
|
|
struct rpc_cred *cred;
|
|
const struct nfs4_state_recovery_ops *ops =
|
|
clp->cl_mvops->reboot_recovery_ops;
|
|
int status = -ENOENT;
|
|
|
|
cred = ops->get_clid_cred(clp);
|
|
if (cred != NULL) {
|
|
status = ops->establish_clid(clp, cred);
|
|
put_rpccred(cred);
|
|
/* Handle case where the user hasn't set up machine creds */
|
|
if (status == -EACCES && cred == clp->cl_machine_cred) {
|
|
nfs4_clear_machine_cred(clp);
|
|
status = -EAGAIN;
|
|
}
|
|
if (status == -NFS4ERR_MINOR_VERS_MISMATCH)
|
|
status = -EPROTONOSUPPORT;
|
|
}
|
|
return status;
|
|
}
|
|
|
|
#ifdef CONFIG_NFS_V4_1
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void nfs4_schedule_session_recovery(struct nfs4_session *session)
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{
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nfs4_schedule_lease_recovery(session->clp);
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}
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EXPORT_SYMBOL_GPL(nfs4_schedule_session_recovery);
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void nfs41_handle_recall_slot(struct nfs_client *clp)
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{
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set_bit(NFS4CLNT_RECALL_SLOT, &clp->cl_state);
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nfs4_schedule_state_manager(clp);
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}
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static void nfs4_reset_all_state(struct nfs_client *clp)
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{
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if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) {
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clp->cl_boot_time = CURRENT_TIME;
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nfs4_state_start_reclaim_nograce(clp);
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nfs4_schedule_state_manager(clp);
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}
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}
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static void nfs41_handle_server_reboot(struct nfs_client *clp)
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{
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if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) {
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nfs4_state_start_reclaim_reboot(clp);
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nfs4_schedule_state_manager(clp);
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}
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}
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static void nfs41_handle_state_revoked(struct nfs_client *clp)
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{
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/* Temporary */
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nfs4_reset_all_state(clp);
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}
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static void nfs41_handle_recallable_state_revoked(struct nfs_client *clp)
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{
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/* This will need to handle layouts too */
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nfs_expire_all_delegations(clp);
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}
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static void nfs41_handle_cb_path_down(struct nfs_client *clp)
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{
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nfs_expire_all_delegations(clp);
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if (test_and_set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state) == 0)
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nfs4_schedule_state_manager(clp);
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}
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void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags)
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{
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if (!flags)
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return;
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else if (flags & SEQ4_STATUS_RESTART_RECLAIM_NEEDED)
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nfs41_handle_server_reboot(clp);
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else if (flags & (SEQ4_STATUS_EXPIRED_ALL_STATE_REVOKED |
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SEQ4_STATUS_EXPIRED_SOME_STATE_REVOKED |
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SEQ4_STATUS_ADMIN_STATE_REVOKED |
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SEQ4_STATUS_LEASE_MOVED))
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nfs41_handle_state_revoked(clp);
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else if (flags & SEQ4_STATUS_RECALLABLE_STATE_REVOKED)
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nfs41_handle_recallable_state_revoked(clp);
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else if (flags & (SEQ4_STATUS_CB_PATH_DOWN |
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SEQ4_STATUS_BACKCHANNEL_FAULT |
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SEQ4_STATUS_CB_PATH_DOWN_SESSION))
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nfs41_handle_cb_path_down(clp);
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}
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static int nfs4_reset_session(struct nfs_client *clp)
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{
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int status;
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nfs4_begin_drain_session(clp);
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status = nfs4_proc_destroy_session(clp->cl_session);
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if (status && status != -NFS4ERR_BADSESSION &&
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status != -NFS4ERR_DEADSESSION) {
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status = nfs4_recovery_handle_error(clp, status);
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goto out;
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}
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memset(clp->cl_session->sess_id.data, 0, NFS4_MAX_SESSIONID_LEN);
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status = nfs4_proc_create_session(clp);
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if (status) {
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status = nfs4_recovery_handle_error(clp, status);
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goto out;
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}
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/* create_session negotiated new slot table */
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clear_bit(NFS4CLNT_RECALL_SLOT, &clp->cl_state);
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/* Let the state manager reestablish state */
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if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
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nfs41_setup_state_renewal(clp);
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out:
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return status;
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}
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static int nfs4_recall_slot(struct nfs_client *clp)
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{
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struct nfs4_slot_table *fc_tbl = &clp->cl_session->fc_slot_table;
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struct nfs4_channel_attrs *fc_attrs = &clp->cl_session->fc_attrs;
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struct nfs4_slot *new, *old;
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int i;
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nfs4_begin_drain_session(clp);
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new = kmalloc(fc_tbl->target_max_slots * sizeof(struct nfs4_slot),
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GFP_NOFS);
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if (!new)
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return -ENOMEM;
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spin_lock(&fc_tbl->slot_tbl_lock);
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for (i = 0; i < fc_tbl->target_max_slots; i++)
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new[i].seq_nr = fc_tbl->slots[i].seq_nr;
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old = fc_tbl->slots;
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fc_tbl->slots = new;
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fc_tbl->max_slots = fc_tbl->target_max_slots;
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fc_tbl->target_max_slots = 0;
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fc_attrs->max_reqs = fc_tbl->max_slots;
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spin_unlock(&fc_tbl->slot_tbl_lock);
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kfree(old);
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nfs4_end_drain_session(clp);
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return 0;
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}
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#else /* CONFIG_NFS_V4_1 */
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static int nfs4_reset_session(struct nfs_client *clp) { return 0; }
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static int nfs4_end_drain_session(struct nfs_client *clp) { return 0; }
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static int nfs4_recall_slot(struct nfs_client *clp) { return 0; }
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#endif /* CONFIG_NFS_V4_1 */
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/* Set NFS4CLNT_LEASE_EXPIRED for all v4.0 errors and for recoverable errors
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* on EXCHANGE_ID for v4.1
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*/
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static void nfs4_set_lease_expired(struct nfs_client *clp, int status)
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{
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if (nfs4_has_session(clp)) {
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switch (status) {
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case -NFS4ERR_DELAY:
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case -NFS4ERR_CLID_INUSE:
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case -EAGAIN:
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break;
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case -EKEYEXPIRED:
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nfs4_warn_keyexpired(clp->cl_hostname);
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case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery
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* in nfs4_exchange_id */
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default:
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return;
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}
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}
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set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
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}
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static void nfs4_state_manager(struct nfs_client *clp)
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{
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int status = 0;
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/* Ensure exclusive access to NFSv4 state */
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for(;;) {
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if (test_and_clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) {
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/* We're going to have to re-establish a clientid */
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status = nfs4_reclaim_lease(clp);
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if (status) {
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nfs4_set_lease_expired(clp, status);
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if (test_bit(NFS4CLNT_LEASE_EXPIRED,
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&clp->cl_state))
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continue;
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if (clp->cl_cons_state ==
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NFS_CS_SESSION_INITING)
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nfs_mark_client_ready(clp, status);
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goto out_error;
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}
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clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
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set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
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pnfs_destroy_all_layouts(clp);
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}
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if (test_and_clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state)) {
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status = nfs4_check_lease(clp);
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if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
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continue;
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if (status < 0 && status != -NFS4ERR_CB_PATH_DOWN)
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goto out_error;
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}
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/* Initialize or reset the session */
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if (test_and_clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state)
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&& nfs4_has_session(clp)) {
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status = nfs4_reset_session(clp);
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if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
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continue;
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if (status < 0)
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goto out_error;
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}
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/* First recover reboot state... */
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if (test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) {
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status = nfs4_do_reclaim(clp,
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clp->cl_mvops->reboot_recovery_ops);
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if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) ||
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test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state))
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continue;
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nfs4_state_end_reclaim_reboot(clp);
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if (test_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state))
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continue;
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if (status < 0)
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goto out_error;
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}
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/* Now recover expired state... */
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if (test_and_clear_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state)) {
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status = nfs4_do_reclaim(clp,
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clp->cl_mvops->nograce_recovery_ops);
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if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) ||
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test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state) ||
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test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state))
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continue;
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if (status < 0)
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goto out_error;
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}
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nfs4_end_drain_session(clp);
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if (test_and_clear_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state)) {
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nfs_client_return_marked_delegations(clp);
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continue;
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}
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/* Recall session slots */
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if (test_and_clear_bit(NFS4CLNT_RECALL_SLOT, &clp->cl_state)
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&& nfs4_has_session(clp)) {
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status = nfs4_recall_slot(clp);
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if (status < 0)
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goto out_error;
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continue;
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}
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nfs4_clear_state_manager_bit(clp);
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/* Did we race with an attempt to give us more work? */
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if (clp->cl_state == 0)
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break;
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if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0)
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break;
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}
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return;
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out_error:
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printk(KERN_WARNING "Error: state manager failed on NFSv4 server %s"
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" with error %d\n", clp->cl_hostname, -status);
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nfs4_end_drain_session(clp);
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nfs4_clear_state_manager_bit(clp);
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}
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static int nfs4_run_state_manager(void *ptr)
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{
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struct nfs_client *clp = ptr;
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allow_signal(SIGKILL);
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nfs4_state_manager(clp);
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nfs_put_client(clp);
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module_put_and_exit(0);
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return 0;
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}
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/*
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* Local variables:
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* c-basic-offset: 8
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* End:
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*/
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