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- /*
- * fs/nfs/nfs4state.c
- *
- * Client-side XDR for NFSv4.
- *
- * Copyright (c) 2002 The Regents of the University of Michigan.
- * All rights reserved.
- *
- * Kendrick Smith <kmsmith@umich.edu>
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. Neither the name of the University nor the names of its
- * contributors may be used to endorse or promote products derived
- * from this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
- * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
- * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
- * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
- * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
- * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
- * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
- * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
- * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- *
- * Implementation of the NFSv4 state model. For the time being,
- * this is minimal, but will be made much more complex in a
- * subsequent patch.
- */
- #include <linux/kernel.h>
- #include <linux/slab.h>
- #include <linux/fs.h>
- #include <linux/nfs_fs.h>
- #include <linux/kthread.h>
- #include <linux/module.h>
- #include <linux/random.h>
- #include <linux/ratelimit.h>
- #include <linux/workqueue.h>
- #include <linux/bitops.h>
- #include <linux/jiffies.h>
- #include <linux/sunrpc/clnt.h>
- #include "nfs4_fs.h"
- #include "callback.h"
- #include "delegation.h"
- #include "internal.h"
- #include "nfs4idmap.h"
- #include "nfs4session.h"
- #include "pnfs.h"
- #include "netns.h"
- #define NFSDBG_FACILITY NFSDBG_STATE
- #define OPENOWNER_POOL_SIZE 8
- const nfs4_stateid zero_stateid = {
- { .data = { 0 } },
- .type = NFS4_SPECIAL_STATEID_TYPE,
- };
- const nfs4_stateid invalid_stateid = {
- {
- /* Funky initialiser keeps older gcc versions happy */
- .data = { 0xff, 0xff, 0xff, 0xff, 0 },
- },
- .type = NFS4_INVALID_STATEID_TYPE,
- };
- const nfs4_stateid current_stateid = {
- {
- /* Funky initialiser keeps older gcc versions happy */
- .data = { 0x0, 0x0, 0x0, 0x1, 0 },
- },
- .type = NFS4_SPECIAL_STATEID_TYPE,
- };
- static DEFINE_MUTEX(nfs_clid_init_mutex);
- int nfs4_init_clientid(struct nfs_client *clp, struct rpc_cred *cred)
- {
- struct nfs4_setclientid_res clid = {
- .clientid = clp->cl_clientid,
- .confirm = clp->cl_confirm,
- };
- unsigned short port;
- int status;
- struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
- if (test_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state))
- goto do_confirm;
- port = nn->nfs_callback_tcpport;
- if (clp->cl_addr.ss_family == AF_INET6)
- port = nn->nfs_callback_tcpport6;
- status = nfs4_proc_setclientid(clp, NFS4_CALLBACK, port, cred, &clid);
- if (status != 0)
- goto out;
- clp->cl_clientid = clid.clientid;
- clp->cl_confirm = clid.confirm;
- set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
- do_confirm:
- status = nfs4_proc_setclientid_confirm(clp, &clid, cred);
- if (status != 0)
- goto out;
- clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
- nfs4_schedule_state_renewal(clp);
- out:
- return status;
- }
- /**
- * nfs40_discover_server_trunking - Detect server IP address trunking (mv0)
- *
- * @clp: nfs_client under test
- * @result: OUT: found nfs_client, or clp
- * @cred: credential to use for trunking test
- *
- * Returns zero, a negative errno, or a negative NFS4ERR status.
- * If zero is returned, an nfs_client pointer is planted in
- * "result".
- *
- * Note: The returned client may not yet be marked ready.
- */
- int nfs40_discover_server_trunking(struct nfs_client *clp,
- struct nfs_client **result,
- struct rpc_cred *cred)
- {
- struct nfs4_setclientid_res clid = {
- .clientid = clp->cl_clientid,
- .confirm = clp->cl_confirm,
- };
- struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
- unsigned short port;
- int status;
- port = nn->nfs_callback_tcpport;
- if (clp->cl_addr.ss_family == AF_INET6)
- port = nn->nfs_callback_tcpport6;
- status = nfs4_proc_setclientid(clp, NFS4_CALLBACK, port, cred, &clid);
- if (status != 0)
- goto out;
- clp->cl_clientid = clid.clientid;
- clp->cl_confirm = clid.confirm;
- status = nfs40_walk_client_list(clp, result, cred);
- if (status == 0) {
- /* Sustain the lease, even if it's empty. If the clientid4
- * goes stale it's of no use for trunking discovery. */
- nfs4_schedule_state_renewal(*result);
- /* If the client state need to recover, do it. */
- if (clp->cl_state)
- nfs4_schedule_state_manager(clp);
- }
- out:
- return status;
- }
- struct rpc_cred *nfs4_get_machine_cred_locked(struct nfs_client *clp)
- {
- struct rpc_cred *cred = NULL;
- if (clp->cl_machine_cred != NULL)
- cred = get_rpccred(clp->cl_machine_cred);
- return cred;
- }
- static void nfs4_root_machine_cred(struct nfs_client *clp)
- {
- struct rpc_cred *cred, *new;
- new = rpc_lookup_machine_cred(NULL);
- spin_lock(&clp->cl_lock);
- cred = clp->cl_machine_cred;
- clp->cl_machine_cred = new;
- spin_unlock(&clp->cl_lock);
- if (cred != NULL)
- put_rpccred(cred);
- }
- static struct rpc_cred *
- nfs4_get_renew_cred_server_locked(struct nfs_server *server)
- {
- struct rpc_cred *cred = NULL;
- struct nfs4_state_owner *sp;
- struct rb_node *pos;
- 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 (list_empty(&sp->so_states))
- continue;
- cred = get_rpccred(sp->so_cred);
- break;
- }
- return cred;
- }
- /**
- * nfs4_get_renew_cred_locked - Acquire credential for a renew operation
- * @clp: client state handle
- *
- * Returns an rpc_cred with reference count bumped, or NULL.
- * Caller must hold clp->cl_lock.
- */
- struct rpc_cred *nfs4_get_renew_cred_locked(struct nfs_client *clp)
- {
- struct rpc_cred *cred = NULL;
- struct nfs_server *server;
- /* Use machine credentials if available */
- cred = nfs4_get_machine_cred_locked(clp);
- if (cred != NULL)
- goto out;
- rcu_read_lock();
- list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
- cred = nfs4_get_renew_cred_server_locked(server);
- if (cred != NULL)
- break;
- }
- rcu_read_unlock();
- out:
- return cred;
- }
- static void nfs4_end_drain_slot_table(struct nfs4_slot_table *tbl)
- {
- if (test_and_clear_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state)) {
- spin_lock(&tbl->slot_tbl_lock);
- nfs41_wake_slot_table(tbl);
- spin_unlock(&tbl->slot_tbl_lock);
- }
- }
- static void nfs4_end_drain_session(struct nfs_client *clp)
- {
- struct nfs4_session *ses = clp->cl_session;
- if (clp->cl_slot_tbl) {
- nfs4_end_drain_slot_table(clp->cl_slot_tbl);
- return;
- }
- if (ses != NULL) {
- nfs4_end_drain_slot_table(&ses->bc_slot_table);
- nfs4_end_drain_slot_table(&ses->fc_slot_table);
- }
- }
- static int nfs4_drain_slot_tbl(struct nfs4_slot_table *tbl)
- {
- set_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state);
- spin_lock(&tbl->slot_tbl_lock);
- if (tbl->highest_used_slotid != NFS4_NO_SLOT) {
- reinit_completion(&tbl->complete);
- spin_unlock(&tbl->slot_tbl_lock);
- return wait_for_completion_interruptible(&tbl->complete);
- }
- spin_unlock(&tbl->slot_tbl_lock);
- return 0;
- }
- static int nfs4_begin_drain_session(struct nfs_client *clp)
- {
- struct nfs4_session *ses = clp->cl_session;
- int ret;
- if (clp->cl_slot_tbl)
- return nfs4_drain_slot_tbl(clp->cl_slot_tbl);
- /* back channel */
- ret = nfs4_drain_slot_tbl(&ses->bc_slot_table);
- if (ret)
- return ret;
- /* fore channel */
- return nfs4_drain_slot_tbl(&ses->fc_slot_table);
- }
- #if defined(CONFIG_NFS_V4_1)
- static int nfs41_setup_state_renewal(struct nfs_client *clp)
- {
- int status;
- struct nfs_fsinfo fsinfo;
- unsigned long now;
- if (!test_bit(NFS_CS_CHECK_LEASE_TIME, &clp->cl_res_state)) {
- nfs4_schedule_state_renewal(clp);
- return 0;
- }
- now = jiffies;
- status = nfs4_proc_get_lease_time(clp, &fsinfo);
- if (status == 0) {
- nfs4_set_lease_period(clp, fsinfo.lease_time * HZ, now);
- nfs4_schedule_state_renewal(clp);
- }
- return status;
- }
- static void nfs41_finish_session_reset(struct nfs_client *clp)
- {
- clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
- clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
- /* create_session negotiated new slot table */
- clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
- nfs41_setup_state_renewal(clp);
- }
- int nfs41_init_clientid(struct nfs_client *clp, struct rpc_cred *cred)
- {
- int status;
- if (test_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state))
- goto do_confirm;
- status = nfs4_proc_exchange_id(clp, cred);
- if (status != 0)
- goto out;
- set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
- do_confirm:
- status = nfs4_proc_create_session(clp, cred);
- if (status != 0)
- goto out;
- nfs41_finish_session_reset(clp);
- nfs_mark_client_ready(clp, NFS_CS_READY);
- out:
- return status;
- }
- /**
- * nfs41_discover_server_trunking - Detect server IP address trunking (mv1)
- *
- * @clp: nfs_client under test
- * @result: OUT: found nfs_client, or clp
- * @cred: credential to use for trunking test
- *
- * Returns NFS4_OK, a negative errno, or a negative NFS4ERR status.
- * If NFS4_OK is returned, an nfs_client pointer is planted in
- * "result".
- *
- * Note: The returned client may not yet be marked ready.
- */
- int nfs41_discover_server_trunking(struct nfs_client *clp,
- struct nfs_client **result,
- struct rpc_cred *cred)
- {
- int status;
- status = nfs4_proc_exchange_id(clp, cred);
- if (status != NFS4_OK)
- return status;
- status = nfs41_walk_client_list(clp, result, cred);
- if (status < 0)
- return status;
- if (clp != *result)
- return 0;
- /*
- * Purge state if the client id was established in a prior
- * instance and the client id could not have arrived on the
- * server via Transparent State Migration.
- */
- if (clp->cl_exchange_flags & EXCHGID4_FLAG_CONFIRMED_R) {
- if (!test_bit(NFS_CS_TSM_POSSIBLE, &clp->cl_flags))
- set_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state);
- else
- set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
- }
- nfs4_schedule_state_manager(clp);
- status = nfs_wait_client_init_complete(clp);
- if (status < 0)
- nfs_put_client(clp);
- return status;
- }
- #endif /* CONFIG_NFS_V4_1 */
- /**
- * nfs4_get_clid_cred - Acquire credential for a setclientid operation
- * @clp: client state handle
- *
- * Returns an rpc_cred with reference count bumped, or NULL.
- */
- struct rpc_cred *nfs4_get_clid_cred(struct nfs_client *clp)
- {
- struct rpc_cred *cred;
- spin_lock(&clp->cl_lock);
- cred = nfs4_get_machine_cred_locked(clp);
- spin_unlock(&clp->cl_lock);
- return cred;
- }
- static struct nfs4_state_owner *
- nfs4_find_state_owner_locked(struct nfs_server *server, struct rpc_cred *cred)
- {
- struct rb_node **p = &server->state_owners.rb_node,
- *parent = NULL;
- struct nfs4_state_owner *sp;
- while (*p != NULL) {
- parent = *p;
- sp = rb_entry(parent, struct nfs4_state_owner, so_server_node);
- if (cred < sp->so_cred)
- 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);
- return sp;
- }
- }
- return NULL;
- }
- static struct nfs4_state_owner *
- nfs4_insert_state_owner_locked(struct nfs4_state_owner *new)
- {
- struct nfs_server *server = new->so_server;
- struct rb_node **p = &server->state_owners.rb_node,
- *parent = NULL;
- struct nfs4_state_owner *sp;
- 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;
- }
- }
- 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);
- }
- 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_seqid.owner_id = ida_simple_get(&server->openowner_id, 0, 0,
- gfp_flags);
- if (sp->so_seqid.owner_id < 0) {
- kfree(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_reset_state_owner(struct nfs4_state_owner *sp)
- {
- /* This state_owner is no longer usable, but must
- * remain in place so that state recovery can find it
- * and the opens associated with it.
- * It may also be used for new 'open' request to
- * return a delegation to the server.
- * So update the 'create_time' so that it looks like
- * a new state_owner. This will cause the server to
- * request an OPEN_CONFIRM to start a new sequence.
- */
- sp->so_seqid.create_time = ktime_get();
- }
- static void nfs4_free_state_owner(struct nfs4_state_owner *sp)
- {
- nfs4_destroy_seqid_counter(&sp->so_seqid);
- put_rpccred(sp->so_cred);
- ida_simple_remove(&sp->so_server->openowner_id, sp->so_seqid.owner_id);
- 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;
- spin_lock(&clp->cl_lock);
- sp = nfs4_insert_state_owner_locked(new);
- spin_unlock(&clp->cl_lock);
- 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
- * @head: resulting list of state owners
- *
- * Called at umount time. Remaining state owners will be on
- * the LRU with ref count of zero.
- * Note that the state owners are not freed, but are added
- * to the list @head, which can later be used as an argument
- * to nfs4_free_state_owners.
- */
- void nfs4_purge_state_owners(struct nfs_server *server, struct list_head *head)
- {
- struct nfs_client *clp = server->nfs_client;
- struct nfs4_state_owner *sp, *tmp;
- spin_lock(&clp->cl_lock);
- list_for_each_entry_safe(sp, tmp, &server->state_owners_lru, so_lru) {
- list_move(&sp->so_lru, head);
- nfs4_remove_state_owner_locked(sp);
- }
- spin_unlock(&clp->cl_lock);
- }
- /**
- * nfs4_purge_state_owners - Release all cached state owners
- * @head: resulting list of state owners
- *
- * Frees a list of state owners that was generated by
- * nfs4_purge_state_owners
- */
- void nfs4_free_state_owners(struct list_head *head)
- {
- struct nfs4_state_owner *sp, *tmp;
- list_for_each_entry_safe(sp, tmp, head, 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);
- init_waitqueue_head(&state->waitq);
- 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 either of the given owners.
- * If the second is non-zero, then the first refers to a Posix-lock
- * owner (current->files) and the second refers to a flock/OFD
- * owner (struct file*). In that case, prefer a match for the first
- * owner.
- * If both sorts of locks are held on the one file we cannot know
- * which stateid was intended to be used, so a "correct" choice cannot
- * be made. Failing that, a "consistent" choice is preferable. The
- * consistent choice we make is to prefer the first owner, that of a
- * Posix lock.
- */
- static struct nfs4_lock_state *
- __nfs4_find_lock_state(struct nfs4_state *state,
- fl_owner_t fl_owner, fl_owner_t fl_owner2)
- {
- struct nfs4_lock_state *pos, *ret = NULL;
- list_for_each_entry(pos, &state->lock_states, ls_locks) {
- if (pos->ls_owner == fl_owner) {
- ret = pos;
- break;
- }
- if (pos->ls_owner == fl_owner2)
- ret = pos;
- }
- if (ret)
- refcount_inc(&ret->ls_count);
- return ret;
- }
- /*
- * 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);
- refcount_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, NULL);
- 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 (!refcount_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;
- refcount_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_lock_context *l_ctx)
- {
- struct nfs4_lock_state *lsp;
- fl_owner_t fl_owner, fl_flock_owner;
- int ret = -ENOENT;
- if (l_ctx == NULL)
- goto out;
- if (test_bit(LK_STATE_IN_USE, &state->flags) == 0)
- goto out;
- fl_owner = l_ctx->lockowner;
- fl_flock_owner = l_ctx->open_context->flock_owner;
- spin_lock(&state->state_lock);
- lsp = __nfs4_find_lock_state(state, fl_owner, fl_flock_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;
- }
- bool nfs4_refresh_open_stateid(nfs4_stateid *dst, struct nfs4_state *state)
- {
- bool ret;
- int seq;
- do {
- ret = false;
- seq = read_seqbegin(&state->seqlock);
- if (nfs4_state_match_open_stateid_other(state, dst)) {
- dst->seqid = state->open_stateid.seqid;
- ret = true;
- }
- } while (read_seqretry(&state->seqlock, seq));
- return ret;
- }
- bool nfs4_copy_open_stateid(nfs4_stateid *dst, struct nfs4_state *state)
- {
- bool ret;
- const nfs4_stateid *src;
- int seq;
- do {
- ret = false;
- src = &zero_stateid;
- seq = read_seqbegin(&state->seqlock);
- if (test_bit(NFS_OPEN_STATE, &state->flags)) {
- src = &state->open_stateid;
- ret = true;
- }
- nfs4_stateid_copy(dst, src);
- } while (read_seqretry(&state->seqlock, seq));
- return ret;
- }
- /*
- * 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_lock_context *l_ctx,
- nfs4_stateid *dst, struct rpc_cred **cred)
- {
- int ret;
- if (!nfs4_valid_open_stateid(state))
- return -EIO;
- if (cred != NULL)
- *cred = NULL;
- ret = nfs4_copy_lock_stateid(dst, state, l_ctx);
- 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:
- case -NFS4ERR_MOVED:
- /* 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_reset_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];
- set_bit(NFS4CLNT_RUN_MANAGER, &clp->cl_state);
- if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0)
- return;
- __module_get(THIS_MODULE);
- refcount_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();
- refcount_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)
- {
- if (!nfs4_valid_open_stateid(state))
- return 0;
- 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)
- {
- if (!nfs4_valid_open_stateid(state))
- return 0;
- 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_state_mark_reclaim_nograce(clp, state))
- return -EBADF;
- nfs_inode_find_delegation_state_and_recover(state->inode,
- &state->stateid);
- 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);
- static struct nfs4_lock_state *
- nfs_state_find_lock_state_by_stateid(struct nfs4_state *state,
- const nfs4_stateid *stateid)
- {
- struct nfs4_lock_state *pos;
- list_for_each_entry(pos, &state->lock_states, ls_locks) {
- if (!test_bit(NFS_LOCK_INITIALIZED, &pos->ls_flags))
- continue;
- if (nfs4_stateid_match_other(&pos->ls_stateid, stateid))
- return pos;
- }
- return NULL;
- }
- static bool nfs_state_lock_state_matches_stateid(struct nfs4_state *state,
- const nfs4_stateid *stateid)
- {
- bool found = false;
- if (test_bit(LK_STATE_IN_USE, &state->flags)) {
- spin_lock(&state->state_lock);
- if (nfs_state_find_lock_state_by_stateid(state, stateid))
- found = true;
- spin_unlock(&state->state_lock);
- }
- return found;
- }
- 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 (nfs4_stateid_match_other(&state->stateid, stateid) &&
- nfs4_state_mark_reclaim_nograce(clp, state)) {
- found = true;
- continue;
- }
- if (nfs4_stateid_match_other(&state->open_stateid, stateid) &&
- nfs4_state_mark_reclaim_nograce(clp, state)) {
- found = true;
- continue;
- }
- if (nfs_state_lock_state_matches_stateid(state, stateid) &&
- nfs4_state_mark_reclaim_nograce(clp, state))
- found = true;
- }
- spin_unlock(&inode->i_lock);
- nfs_inode_find_delegation_state_and_recover(inode, stateid);
- 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;
- struct nfs4_lock_state *lsp;
- 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);
- /* Fall through */
- case -ENOMEM:
- case -NFS4ERR_DENIED:
- case -NFS4ERR_RECLAIM_BAD:
- case -NFS4ERR_RECLAIM_CONFLICT:
- lsp = fl->fl_u.nfs4_fl.owner;
- if (lsp)
- set_bit(NFS_LOCK_LOST, &lsp->ls_flags);
- 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);
- }
- clear_bit(NFS_STATE_RECLAIM_NOGRACE,
- &state->flags);
- #ifdef CONFIG_NFS_V4_2
- if (test_bit(NFS_CLNT_DST_SSC_COPY_STATE, &state->flags)) {
- struct nfs4_copy_state *copy;
- spin_lock(&sp->so_server->nfs_client->cl_lock);
- list_for_each_entry(copy, &sp->so_server->ss_copies, copies) {
- if (memcmp(&state->stateid.other, ©->parent_state->stateid.other, NFS4_STATEID_SIZE))
- continue;
- copy->flags = 1;
- complete(©->completion);
- printk("AGLO: server rebooted waking up the copy\n");
- break;
- }
- spin_unlock(&sp->so_server->nfs_client->cl_lock);
- }
- #endif /* CONFIG_NFS_V4_2 */
- nfs4_put_open_state(state);
- spin_lock(&sp->so_lock);
- goto restart;
- }
- }
- switch (status) {
- default:
- printk(KERN_ERR "NFS: %s: unhandled error %d\n",
- __func__, status);
- /* Fall through */
- case -ENOENT:
- case -ENOMEM:
- case -EACCES:
- case -EROFS:
- case -EIO:
- case -ESTALE:
- /* Open state on this file cannot be recovered */
- nfs4_state_mark_recovery_failed(state, status);
- break;
- case -EAGAIN:
- ssleep(1);
- /* Fall through */
- case -NFS4ERR_ADMIN_REVOKED:
- case -NFS4ERR_STALE_STATEID:
- case -NFS4ERR_OLD_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 int 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)
- return ops->reclaim_complete(clp, cred);
- return 0;
- }
- 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;
- int err;
- if (!nfs4_state_clear_reclaim_reboot(clp))
- return;
- ops = clp->cl_mvops->reboot_recovery_ops;
- cred = nfs4_get_clid_cred(clp);
- err = nfs4_reclaim_complete(clp, ops, cred);
- put_rpccred(cred);
- if (err == -NFS4ERR_CONN_NOT_BOUND_TO_SESSION)
- set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
- }
- static void nfs4_state_start_reclaim_nograce(struct nfs_client *clp)
- {
- nfs_mark_test_expired_all_delegations(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_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;
- LIST_HEAD(freeme);
- int status = 0;
- restart:
- rcu_read_lock();
- list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
- nfs4_purge_state_owners(server, &freeme);
- 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();
- nfs4_free_state_owners(&freeme);
- 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;
- status = nfs4_begin_drain_session(clp);
- if (status != 0)
- return status;
- 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;
- }
- status = nfs4_begin_drain_session(clp);
- if (status != 0)
- return status;
- 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:
- case -EINTR:
- case -ERESTARTSYS:
- break;
- case -ETIMEDOUT:
- if (clnt->cl_softrtry)
- break;
- /* Fall through */
- case -NFS4ERR_DELAY:
- case -EAGAIN:
- ssleep(1);
- /* Fall through */
- 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;
- /* Fall through */
- 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_state_manager(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_start_reclaim_nograce(clp);
- 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,
- bool recovery)
- {
- if (!flags)
- return;
- dprintk("%s: \"%s\" (client ID %llx) flags=0x%08x\n",
- __func__, clp->cl_hostname, clp->cl_clientid, flags);
- /*
- * If we're called from the state manager thread, then assume we're
- * already handling the RECLAIM_NEEDED and/or STATE_REVOKED.
- * Those flags are expected to remain set until we're done
- * recovering (see RFC5661, section 18.46.3).
- */
- if (recovery)
- goto out_recovery;
- 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);
- out_recovery:
- 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;
- status = nfs4_begin_drain_session(clp);
- if (status != 0)
- return status;
- 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;
- ret = nfs4_begin_drain_session(clp);
- if (ret != 0)
- return ret;
- 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 {
- clear_bit(NFS4CLNT_RUN_MANAGER, &clp->cl_state);
- 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);
- }
- /* Detect expired delegations... */
- if (test_and_clear_bit(NFS4CLNT_DELEGATION_EXPIRED, &clp->cl_state)) {
- section = "detect expired delegations";
- nfs_reap_expired_delegations(clp);
- continue;
- }
- /* 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);
- nfs4_clear_state_manager_bit(clp);
- if (!test_and_set_bit(NFS4CLNT_DELEGRETURN_RUNNING, &clp->cl_state)) {
- if (test_and_clear_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state)) {
- nfs_client_return_marked_delegations(clp);
- set_bit(NFS4CLNT_RUN_MANAGER, &clp->cl_state);
- }
- clear_bit(NFS4CLNT_DELEGRETURN_RUNNING, &clp->cl_state);
- }
- /* Did we race with an attempt to give us more work? */
- if (!test_bit(NFS4CLNT_RUN_MANAGER, &clp->cl_state))
- return;
- if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0)
- return;
- } while (refcount_read(&clp->cl_count) > 1 && !signalled());
- goto out_drain;
- 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);
- out_drain:
- 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:
- */
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