| /* |
| * 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/nfs_idmap.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 "nfs4session.h" |
| #include "pnfs.h" |
| #include "netns.h" |
| |
| #define NFSDBG_FACILITY NFSDBG_STATE |
| |
| #define OPENOWNER_POOL_SIZE 8 |
| |
| const nfs4_stateid zero_stateid; |
| 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); |
| } |
| 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; |
| } |
| |
| #if defined(CONFIG_NFS_V4_1) |
| |
| static int nfs41_setup_state_renewal(struct nfs_client *clp) |
| { |
| int status; |
| struct nfs_fsinfo fsinfo; |
| |
| if (!test_bit(NFS_CS_CHECK_LEASE_TIME, &clp->cl_res_state)) { |
| nfs4_schedule_state_renewal(clp); |
| return 0; |
| } |
| |
| status = nfs4_proc_get_lease_time(clp, &fsinfo); |
| if (status == 0) { |
| /* Update lease time and schedule renewal */ |
| spin_lock(&clp->cl_lock); |
| clp->cl_lease_time = fsinfo.lease_time * HZ; |
| clp->cl_last_renewal = jiffies; |
| spin_unlock(&clp->cl_lock); |
| |
| nfs4_schedule_state_renewal(clp); |
| } |
| |
| return status; |
| } |
| |
| 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 (ses != NULL) { |
| nfs4_end_drain_slot_table(&ses->bc_slot_table); |
| nfs4_end_drain_slot_table(&ses->fc_slot_table); |
| } |
| } |
| |
| /* |
| * Signal state manager thread if session fore channel is drained |
| */ |
| void nfs4_slot_tbl_drain_complete(struct nfs4_slot_table *tbl) |
| { |
| if (nfs4_slot_tbl_draining(tbl)) |
| complete(&tbl->complete); |
| } |
| |
| 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) { |
| INIT_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 = 0; |
| |
| /* 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); |
| } |
| |
| 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; |
| nfs4_begin_drain_session(clp); |
| 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; |
| set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state); |
| |
| return nfs41_walk_client_list(clp, result, cred); |
| } |
| |
| #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; |
| int err; |
| |
| while (*p != NULL) { |
| parent = *p; |
| sp = rb_entry(parent, struct nfs4_state_owner, so_server_node); |
| |
| if (new->so_cred < sp->so_cred) |
| p = &parent->rb_left; |
| else if (new->so_cred > sp->so_cred) |
| p = &parent->rb_right; |
| else { |
| if (!list_empty(&sp->so_lru)) |
| list_del_init(&sp->so_lru); |
| atomic_inc(&sp->so_count); |
| return sp; |
| } |
| } |
| err = ida_get_new(&server->openowner_id, &new->so_seqid.owner_id); |
| if (err) |
| return ERR_PTR(err); |
| rb_link_node(&new->so_server_node, parent, p); |
| rb_insert_color(&new->so_server_node, &server->state_owners); |
| return new; |
| } |
| |
| static void |
| nfs4_remove_state_owner_locked(struct nfs4_state_owner *sp) |
| { |
| struct nfs_server *server = sp->so_server; |
| |
| if (!RB_EMPTY_NODE(&sp->so_server_node)) |
| rb_erase(&sp->so_server_node, &server->state_owners); |
| ida_remove(&server->openowner_id, sp->so_seqid.owner_id); |
| } |
| |
| static void |
| nfs4_init_seqid_counter(struct nfs_seqid_counter *sc) |
| { |
| sc->create_time = ktime_get(); |
| sc->flags = 0; |
| sc->counter = 0; |
| spin_lock_init(&sc->lock); |
| INIT_LIST_HEAD(&sc->list); |
| rpc_init_wait_queue(&sc->wait, "Seqid_waitqueue"); |
| } |
| |
| static void |
| nfs4_destroy_seqid_counter(struct nfs_seqid_counter *sc) |
| { |
| rpc_destroy_wait_queue(&sc->wait); |
| } |
| |
| /* |
| * nfs4_alloc_state_owner(): this is called on the OPEN or CREATE path to |
| * create a new state_owner. |
| * |
| */ |
| static struct nfs4_state_owner * |
| nfs4_alloc_state_owner(struct nfs_server *server, |
| struct rpc_cred *cred, |
| gfp_t gfp_flags) |
| { |
| struct nfs4_state_owner *sp; |
| |
| sp = kzalloc(sizeof(*sp), gfp_flags); |
| if (!sp) |
| return NULL; |
| sp->so_server = server; |
| sp->so_cred = get_rpccred(cred); |
| spin_lock_init(&sp->so_lock); |
| INIT_LIST_HEAD(&sp->so_states); |
| nfs4_init_seqid_counter(&sp->so_seqid); |
| atomic_set(&sp->so_count, 1); |
| INIT_LIST_HEAD(&sp->so_lru); |
| seqcount_init(&sp->so_reclaim_seqcount); |
| mutex_init(&sp->so_delegreturn_mutex); |
| return sp; |
| } |
| |
| static void |
| nfs4_drop_state_owner(struct nfs4_state_owner *sp) |
| { |
| struct rb_node *rb_node = &sp->so_server_node; |
| |
| if (!RB_EMPTY_NODE(rb_node)) { |
| struct nfs_server *server = sp->so_server; |
| struct nfs_client *clp = server->nfs_client; |
| |
| spin_lock(&clp->cl_lock); |
| if (!RB_EMPTY_NODE(rb_node)) { |
| rb_erase(rb_node, &server->state_owners); |
| RB_CLEAR_NODE(rb_node); |
| } |
| spin_unlock(&clp->cl_lock); |
| } |
| } |
| |
| static void nfs4_free_state_owner(struct nfs4_state_owner *sp) |
| { |
| nfs4_destroy_seqid_counter(&sp->so_seqid); |
| put_rpccred(sp->so_cred); |
| kfree(sp); |
| } |
| |
| static void nfs4_gc_state_owners(struct nfs_server *server) |
| { |
| struct nfs_client *clp = server->nfs_client; |
| struct nfs4_state_owner *sp, *tmp; |
| unsigned long time_min, time_max; |
| LIST_HEAD(doomed); |
| |
| spin_lock(&clp->cl_lock); |
| time_max = jiffies; |
| time_min = (long)time_max - (long)clp->cl_lease_time; |
| list_for_each_entry_safe(sp, tmp, &server->state_owners_lru, so_lru) { |
| /* NB: LRU is sorted so that oldest is at the head */ |
| if (time_in_range(sp->so_expires, time_min, time_max)) |
| break; |
| list_move(&sp->so_lru, &doomed); |
| nfs4_remove_state_owner_locked(sp); |
| } |
| spin_unlock(&clp->cl_lock); |
| |
| list_for_each_entry_safe(sp, tmp, &doomed, so_lru) { |
| list_del(&sp->so_lru); |
| nfs4_free_state_owner(sp); |
| } |
| } |
| |
| /** |
| * nfs4_get_state_owner - Look up a state owner given a credential |
| * @server: nfs_server to search |
| * @cred: RPC credential to match |
| * |
| * Returns a pointer to an instantiated nfs4_state_owner struct, or NULL. |
| */ |
| struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *server, |
| struct rpc_cred *cred, |
| gfp_t gfp_flags) |
| { |
| struct nfs_client *clp = server->nfs_client; |
| struct nfs4_state_owner *sp, *new; |
| |
| spin_lock(&clp->cl_lock); |
| sp = nfs4_find_state_owner_locked(server, cred); |
| spin_unlock(&clp->cl_lock); |
| if (sp != NULL) |
| goto out; |
| new = nfs4_alloc_state_owner(server, cred, gfp_flags); |
| if (new == NULL) |
| goto out; |
| do { |
| if (ida_pre_get(&server->openowner_id, gfp_flags) == 0) |
| break; |
| spin_lock(&clp->cl_lock); |
| sp = nfs4_insert_state_owner_locked(new); |
| spin_unlock(&clp->cl_lock); |
| } while (sp == ERR_PTR(-EAGAIN)); |
| if (sp != new) |
| nfs4_free_state_owner(new); |
| out: |
| nfs4_gc_state_owners(server); |
| return sp; |
| } |
| |
| /** |
| * nfs4_put_state_owner - Release a nfs4_state_owner |
| * @sp: state owner data to release |
| * |
| * Note that we keep released state owners on an LRU |
| * list. |
| * This caches valid state owners so that they can be |
| * reused, to avoid the OPEN_CONFIRM on minor version 0. |
| * It also pins the uniquifier of dropped state owners for |
| * a while, to ensure that those state owner names are |
| * never reused. |
| */ |
| void nfs4_put_state_owner(struct nfs4_state_owner *sp) |
| { |
| struct nfs_server *server = sp->so_server; |
| struct nfs_client *clp = server->nfs_client; |
| |
| if (!atomic_dec_and_lock(&sp->so_count, &clp->cl_lock)) |
| return; |
| |
| sp->so_expires = jiffies; |
| list_add_tail(&sp->so_lru, &server->state_owners_lru); |
| spin_unlock(&clp->cl_lock); |
| } |
| |
| /** |
| * nfs4_purge_state_owners - Release all cached state owners |
| * @server: nfs_server with cached state owners to release |
| * |
| * Called at umount time. Remaining state owners will be on |
| * the LRU with ref count of zero. |
| */ |
| void nfs4_purge_state_owners(struct nfs_server *server) |
| { |
| struct nfs_client *clp = server->nfs_client; |
| struct nfs4_state_owner *sp, *tmp; |
| LIST_HEAD(doomed); |
| |
| spin_lock(&clp->cl_lock); |
| list_for_each_entry_safe(sp, tmp, &server->state_owners_lru, so_lru) { |
| list_move(&sp->so_lru, &doomed); |
| nfs4_remove_state_owner_locked(sp); |
| } |
| spin_unlock(&clp->cl_lock); |
| |
| list_for_each_entry_safe(sp, tmp, &doomed, so_lru) { |
| list_del(&sp->so_lru); |
| nfs4_free_state_owner(sp); |
| } |
| } |
| |
| static struct nfs4_state * |
| nfs4_alloc_open_state(void) |
| { |
| struct nfs4_state *state; |
| |
| state = kzalloc(sizeof(*state), GFP_NOFS); |
| if (!state) |
| return NULL; |
| atomic_set(&state->count, 1); |
| INIT_LIST_HEAD(&state->lock_states); |
| spin_lock_init(&state->state_lock); |
| seqlock_init(&state->seqlock); |
| return state; |
| } |
| |
| void |
| nfs4_state_set_mode_locked(struct nfs4_state *state, fmode_t fmode) |
| { |
| if (state->state == fmode) |
| return; |
| /* NB! List reordering - see the reclaim code for why. */ |
| if ((fmode & FMODE_WRITE) != (state->state & FMODE_WRITE)) { |
| if (fmode & FMODE_WRITE) |
| list_move(&state->open_states, &state->owner->so_states); |
| else |
| list_move_tail(&state->open_states, &state->owner->so_states); |
| } |
| state->state = fmode; |
| } |
| |
| static struct nfs4_state * |
| __nfs4_find_state_byowner(struct inode *inode, struct nfs4_state_owner *owner) |
| { |
| struct nfs_inode *nfsi = NFS_I(inode); |
| struct nfs4_state *state; |
| |
| list_for_each_entry(state, &nfsi->open_states, inode_states) { |
| if (state->owner != owner) |
| continue; |
| if (!nfs4_valid_open_stateid(state)) |
| continue; |
| if (atomic_inc_not_zero(&state->count)) |
| return state; |
| } |
| return NULL; |
| } |
| |
| static void |
| nfs4_free_open_state(struct nfs4_state *state) |
| { |
| kfree(state); |
| } |
| |
| struct nfs4_state * |
| nfs4_get_open_state(struct inode *inode, struct nfs4_state_owner *owner) |
| { |
| struct nfs4_state *state, *new; |
| struct nfs_inode *nfsi = NFS_I(inode); |
| |
| spin_lock(&inode->i_lock); |
| state = __nfs4_find_state_byowner(inode, owner); |
| spin_unlock(&inode->i_lock); |
| if (state) |
| goto out; |
| new = nfs4_alloc_open_state(); |
| spin_lock(&owner->so_lock); |
| spin_lock(&inode->i_lock); |
| state = __nfs4_find_state_byowner(inode, owner); |
| if (state == NULL && new != NULL) { |
| state = new; |
| state->owner = owner; |
| atomic_inc(&owner->so_count); |
| list_add(&state->inode_states, &nfsi->open_states); |
| ihold(inode); |
| state->inode = inode; |
| spin_unlock(&inode->i_lock); |
| /* Note: The reclaim code dictates that we add stateless |
| * and read-only stateids to the end of the list */ |
| list_add_tail(&state->open_states, &owner->so_states); |
| spin_unlock(&owner->so_lock); |
| } else { |
| spin_unlock(&inode->i_lock); |
| spin_unlock(&owner->so_lock); |
| if (new) |
| nfs4_free_open_state(new); |
| } |
| out: |
| return state; |
| } |
| |
| void nfs4_put_open_state(struct nfs4_state *state) |
| { |
| struct inode *inode = state->inode; |
| struct nfs4_state_owner *owner = state->owner; |
| |
| if (!atomic_dec_and_lock(&state->count, &owner->so_lock)) |
| return; |
| spin_lock(&inode->i_lock); |
| list_del(&state->inode_states); |
| list_del(&state->open_states); |
| spin_unlock(&inode->i_lock); |
| spin_unlock(&owner->so_lock); |
| iput(inode); |
| nfs4_free_open_state(state); |
| nfs4_put_state_owner(owner); |
| } |
| |
| /* |
| * Close the current file. |
| */ |
| static void __nfs4_close(struct nfs4_state *state, |
| fmode_t fmode, gfp_t gfp_mask, int wait) |
| { |
| struct nfs4_state_owner *owner = state->owner; |
| int call_close = 0; |
| fmode_t newstate; |
| |
| atomic_inc(&owner->so_count); |
| /* Protect against nfs4_find_state() */ |
| spin_lock(&owner->so_lock); |
| switch (fmode & (FMODE_READ | FMODE_WRITE)) { |
| case FMODE_READ: |
| state->n_rdonly--; |
| break; |
| case FMODE_WRITE: |
| state->n_wronly--; |
| break; |
| case FMODE_READ|FMODE_WRITE: |
| state->n_rdwr--; |
| } |
| newstate = FMODE_READ|FMODE_WRITE; |
| if (state->n_rdwr == 0) { |
| if (state->n_rdonly == 0) { |
| newstate &= ~FMODE_READ; |
| call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags); |
| call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags); |
| } |
| if (state->n_wronly == 0) { |
| newstate &= ~FMODE_WRITE; |
| call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags); |
| call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags); |
| } |
| if (newstate == 0) |
| clear_bit(NFS_DELEGATED_STATE, &state->flags); |
| } |
| nfs4_state_set_mode_locked(state, newstate); |
| spin_unlock(&owner->so_lock); |
| |
| if (!call_close) { |
| nfs4_put_open_state(state); |
| nfs4_put_state_owner(owner); |
| } else |
| nfs4_do_close(state, gfp_mask, wait); |
| } |
| |
| void nfs4_close_state(struct nfs4_state *state, fmode_t fmode) |
| { |
| __nfs4_close(state, fmode, GFP_NOFS, 0); |
| } |
| |
| void nfs4_close_sync(struct nfs4_state *state, fmode_t fmode) |
| { |
| __nfs4_close(state, fmode, GFP_KERNEL, 1); |
| } |
| |
| /* |
| * Search the state->lock_states for an existing lock_owner |
| * that is compatible with current->files |
| */ |
| static struct nfs4_lock_state * |
| __nfs4_find_lock_state(struct nfs4_state *state, fl_owner_t fl_owner, 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; |
| |
| lsp = kzalloc(sizeof(*lsp), GFP_NOFS); |
| if (lsp == NULL) |
| return NULL; |
| nfs4_init_seqid_counter(&lsp->ls_seqid); |
| atomic_set(&lsp->ls_count, 1); |
| lsp->ls_state = state; |
| lsp->ls_owner.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: |
| goto out_free; |
| } |
| 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, 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(state->owner->so_server, new); |
| return lsp; |
| } |
| |
| /* |
| * Release reference to lock_state, and free it if we see that |
| * it is no longer in use |
| */ |
| void nfs4_put_lock_state(struct nfs4_lock_state *lsp) |
| { |
| struct nfs_server *server; |
| struct nfs4_state *state; |
| |
| if (lsp == NULL) |
| return; |
| state = lsp->ls_state; |
| if (!atomic_dec_and_lock(&lsp->ls_count, &state->state_lock)) |
| return; |
| list_del(&lsp->ls_locks); |
| if (list_empty(&state->lock_states)) |
| clear_bit(LK_STATE_IN_USE, &state->flags); |
| spin_unlock(&state->state_lock); |
| server = state->owner->so_server; |
| if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) { |
| struct nfs_client *clp = server->nfs_client; |
| |
| clp->cl_mvops->free_lock_state(server, lsp); |
| } else |
| nfs4_free_lock_state(server, lsp); |
| } |
| |
| static void nfs4_fl_copy_lock(struct file_lock *dst, struct file_lock *src) |
| { |
| struct nfs4_lock_state *lsp = src->fl_u.nfs4_fl.owner; |
| |
| dst->fl_u.nfs4_fl.owner = lsp; |
| atomic_inc(&lsp->ls_count); |
| } |
| |
| static void nfs4_fl_release_lock(struct file_lock *fl) |
| { |
| nfs4_put_lock_state(fl->fl_u.nfs4_fl.owner); |
| } |
| |
| static const struct file_lock_operations nfs4_fl_lock_ops = { |
| .fl_copy_lock = nfs4_fl_copy_lock, |
| .fl_release_private = nfs4_fl_release_lock, |
| }; |
| |
| int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl) |
| { |
| struct nfs4_lock_state *lsp; |
| |
| if (fl->fl_ops != NULL) |
| return 0; |
| 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, NULL, 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; |
| } |
| |
| static int nfs4_copy_lock_stateid(nfs4_stateid *dst, |
| struct nfs4_state *state, |
| const struct nfs_lockowner *lockowner) |
| { |
| struct nfs4_lock_state *lsp; |
| fl_owner_t fl_owner; |
| pid_t fl_pid; |
| int ret = -ENOENT; |
| |
| |
| if (lockowner == NULL) |
| goto out; |
| |
| if (test_bit(LK_STATE_IN_USE, &state->flags) == 0) |
| goto out; |
| |
| fl_owner = lockowner->l_owner; |
| fl_pid = lockowner->l_pid; |
| spin_lock(&state->state_lock); |
| lsp = __nfs4_find_lock_state(state, fl_owner, fl_pid, NFS4_ANY_LOCK_TYPE); |
| if (lsp != NULL && test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0) { |
| nfs4_stateid_copy(dst, &lsp->ls_stateid); |
| ret = 0; |
| smp_rmb(); |
| if (!list_empty(&lsp->ls_seqid.list)) |
| ret = -EWOULDBLOCK; |
| } |
| spin_unlock(&state->state_lock); |
| nfs4_put_lock_state(lsp); |
| out: |
| return ret; |
| } |
| |
| static int nfs4_copy_open_stateid(nfs4_stateid *dst, struct nfs4_state *state) |
| { |
| const nfs4_stateid *src; |
| int ret; |
| int seq; |
| |
| do { |
| src = &zero_stateid; |
| seq = read_seqbegin(&state->seqlock); |
| if (test_bit(NFS_OPEN_STATE, &state->flags)) |
| src = &state->open_stateid; |
| nfs4_stateid_copy(dst, src); |
| ret = 0; |
| smp_rmb(); |
| if (!list_empty(&state->owner->so_seqid.list)) |
| ret = -EWOULDBLOCK; |
| } 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(nfs4_stateid *dst, struct nfs4_state *state, |
| fmode_t fmode, const struct nfs_lockowner *lockowner) |
| { |
| int ret = 0; |
| if (nfs4_copy_delegation_stateid(dst, state->inode, fmode)) |
| goto out; |
| ret = nfs4_copy_lock_stateid(dst, state, lockowner); |
| if (ret != -ENOENT) |
| goto out; |
| ret = nfs4_copy_open_stateid(dst, state); |
| 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) { |
| 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 (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 nfs_fs.h:seqid_mutating_error() |
| */ |
| static void nfs_increment_seqid(int status, struct nfs_seqid *seqid) |
| { |
| switch (status) { |
| case 0: |
| break; |
| case -NFS4ERR_BAD_SEQID: |
| if (seqid->sequence->flags & NFS_SEQID_CONFIRMED) |
| return; |
| pr_warn_ratelimited("NFS: v4 server returned a bad" |
| " sequence-id error on an" |
| " unconfirmed sequence %p!\n", |
| seqid->sequence); |
| case -NFS4ERR_STALE_CLIENTID: |
| case -NFS4ERR_STALE_STATEID: |
| case -NFS4ERR_BAD_STATEID: |
| case -NFS4ERR_BADXDR: |
| case -NFS4ERR_RESOURCE: |
| case -NFS4ERR_NOFILEHANDLE: |
| /* Non-seqid mutating errors */ |
| return; |
| }; |
| /* |
| * Note: no locking needed as we are guaranteed to be first |
| * on the sequence list |
| */ |
| seqid->sequence->counter++; |
| } |
| |
| void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid) |
| { |
| struct nfs4_state_owner *sp = 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 nfs_seqid_counter *sequence = seqid->sequence; |
| int status = 0; |
| |
| 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); |
| 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; |
| char buf[INET6_ADDRSTRLEN + sizeof("-manager") + 1]; |
| |
| if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0) |
| return; |
| __module_get(THIS_MODULE); |
| atomic_inc(&clp->cl_count); |
| |
| /* The rcu_read_lock() is not strictly necessary, as the state |
| * manager is the only thread that ever changes the rpc_xprt |
| * after it's initialized. At this point, we're single threaded. */ |
| rcu_read_lock(); |
| snprintf(buf, sizeof(buf), "%s-manager", |
| rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR)); |
| rcu_read_unlock(); |
| task = kthread_run(nfs4_run_state_manager, clp, "%s", buf); |
| if (IS_ERR(task)) { |
| printk(KERN_ERR "%s: kthread_run: %ld\n", |
| __func__, PTR_ERR(task)); |
| nfs4_clear_state_manager_bit(clp); |
| nfs_put_client(clp); |
| module_put(THIS_MODULE); |
| } |
| } |
| |
| /* |
| * Schedule a lease recovery attempt |
| */ |
| void nfs4_schedule_lease_recovery(struct nfs_client *clp) |
| { |
| if (!clp) |
| return; |
| if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) |
| set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state); |
| dprintk("%s: scheduling lease recovery for server %s\n", __func__, |
| clp->cl_hostname); |
| nfs4_schedule_state_manager(clp); |
| } |
| EXPORT_SYMBOL_GPL(nfs4_schedule_lease_recovery); |
| |
| int nfs4_wait_clnt_recover(struct nfs_client *clp) |
| { |
| int res; |
| |
| might_sleep(); |
| |
| res = wait_on_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING, |
| nfs_wait_bit_killable, TASK_KILLABLE); |
| if (res) |
| return res; |
| |
| if (clp->cl_cons_state < 0) |
| return clp->cl_cons_state; |
| return 0; |
| } |
| |
| int nfs4_client_recover_expired_lease(struct nfs_client *clp) |
| { |
| unsigned int loop; |
| int ret; |
| |
| for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) { |
| ret = nfs4_wait_clnt_recover(clp); |
| if (ret != 0) |
| break; |
| if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) && |
| !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state)) |
| break; |
| nfs4_schedule_state_manager(clp); |
| ret = -EIO; |
| } |
| return ret; |
| } |
| |
| /* |
| * nfs40_handle_cb_pathdown - return all delegations after NFS4ERR_CB_PATH_DOWN |
| * @clp: client to process |
| * |
| * Set the NFS4CLNT_LEASE_EXPIRED state in order to force a |
| * resend of the SETCLIENTID and hence re-establish the |
| * callback channel. Then return all existing delegations. |
| */ |
| static void nfs40_handle_cb_pathdown(struct nfs_client *clp) |
| { |
| set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); |
| nfs_expire_all_delegations(clp); |
| dprintk("%s: handling CB_PATHDOWN recovery for server %s\n", __func__, |
| clp->cl_hostname); |
| } |
| |
| void nfs4_schedule_path_down_recovery(struct nfs_client *clp) |
| { |
| nfs40_handle_cb_pathdown(clp); |
| nfs4_schedule_state_manager(clp); |
| } |
| |
| static int nfs4_state_mark_reclaim_reboot(struct nfs_client *clp, struct nfs4_state *state) |
| { |
| |
| set_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags); |
| /* Don't recover state that expired before the reboot */ |
| if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) { |
| clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags); |
| return 0; |
| } |
| set_bit(NFS_OWNER_RECLAIM_REBOOT, &state->owner->so_flags); |
| set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state); |
| return 1; |
| } |
| |
| 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; |
| } |
| |
| int nfs4_schedule_stateid_recovery(const struct nfs_server *server, struct nfs4_state *state) |
| { |
| struct nfs_client *clp = server->nfs_client; |
| |
| if (!nfs4_valid_open_stateid(state)) |
| return -EBADF; |
| nfs4_state_mark_reclaim_nograce(clp, state); |
| dprintk("%s: scheduling stateid recovery for server %s\n", __func__, |
| clp->cl_hostname); |
| nfs4_schedule_state_manager(clp); |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(nfs4_schedule_stateid_recovery); |
| |
| void nfs_inode_find_state_and_recover(struct inode *inode, |
| const nfs4_stateid *stateid) |
| { |
| struct nfs_client *clp = NFS_SERVER(inode)->nfs_client; |
| struct nfs_inode *nfsi = NFS_I(inode); |
| struct nfs_open_context *ctx; |
| struct nfs4_state *state; |
| bool found = false; |
| |
| spin_lock(&inode->i_lock); |
| list_for_each_entry(ctx, &nfsi->open_files, list) { |
| state = ctx->state; |
| if (state == NULL) |
| continue; |
| if (!test_bit(NFS_DELEGATED_STATE, &state->flags)) |
| continue; |
| if (!nfs4_stateid_match(&state->stateid, stateid)) |
| continue; |
| nfs4_state_mark_reclaim_nograce(clp, state); |
| found = true; |
| } |
| spin_unlock(&inode->i_lock); |
| if (found) |
| nfs4_schedule_state_manager(clp); |
| } |
| |
| static void nfs4_state_mark_open_context_bad(struct nfs4_state *state) |
| { |
| struct inode *inode = state->inode; |
| struct nfs_inode *nfsi = NFS_I(inode); |
| struct nfs_open_context *ctx; |
| |
| spin_lock(&inode->i_lock); |
| list_for_each_entry(ctx, &nfsi->open_files, list) { |
| if (ctx->state != state) |
| continue; |
| set_bit(NFS_CONTEXT_BAD, &ctx->flags); |
| } |
| spin_unlock(&inode->i_lock); |
| } |
| |
| static void nfs4_state_mark_recovery_failed(struct nfs4_state *state, int error) |
| { |
| set_bit(NFS_STATE_RECOVERY_FAILED, &state->flags); |
| nfs4_state_mark_open_context_bad(state); |
| } |
| |
| |
| static int nfs4_reclaim_locks(struct nfs4_state *state, const struct nfs4_state_recovery_ops *ops) |
| { |
| struct inode *inode = state->inode; |
| struct nfs_inode *nfsi = NFS_I(inode); |
| struct file_lock *fl; |
| int status = 0; |
| |
| 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 */ |
| spin_lock(&inode->i_lock); |
| 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; |
| spin_unlock(&inode->i_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: |
| printk(KERN_ERR "NFS: %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; |
| } |
| spin_lock(&inode->i_lock); |
| } |
| spin_unlock(&inode->i_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); |
| 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) { |
| spin_lock(&state->state_lock); |
| list_for_each_entry(lock, &state->lock_states, ls_locks) { |
| if (!test_bit(NFS_LOCK_INITIALIZED, &lock->ls_flags)) |
| pr_warn_ratelimited("NFS: " |
| "%s: Lock reclaim " |
| "failed!\n", __func__); |
| } |
| spin_unlock(&state->state_lock); |
| nfs4_put_open_state(state); |
| spin_lock(&sp->so_lock); |
| goto restart; |
| } |
| } |
| switch (status) { |
| default: |
| printk(KERN_ERR "NFS: %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. |
| */ |
| nfs4_state_mark_recovery_failed(state, status); |
| break; |
| case -EAGAIN: |
| ssleep(1); |
| case -NFS4ERR_ADMIN_REVOKED: |
| case -NFS4ERR_STALE_STATEID: |
| case -NFS4ERR_BAD_STATEID: |
| case -NFS4ERR_RECLAIM_BAD: |
| case -NFS4ERR_RECLAIM_CONFLICT: |
| nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state); |
| break; |
| case -NFS4ERR_EXPIRED: |
| case -NFS4ERR_NO_GRACE: |
| nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state); |
| case -NFS4ERR_STALE_CLIENTID: |
| case -NFS4ERR_BADSESSION: |
| case -NFS4ERR_BADSLOT: |
| case -NFS4ERR_BAD_HIGH_SLOT: |
| case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: |
| goto out_err; |
| } |
| nfs4_put_open_state(state); |
| spin_lock(&sp->so_lock); |
| goto restart; |
| } |
| 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); |
| write_seqcount_end(&sp->so_reclaim_seqcount); |
| spin_unlock(&sp->so_lock); |
| return status; |
| } |
| |
| static void nfs4_clear_open_state(struct nfs4_state *state) |
| { |
| struct nfs4_lock_state *lock; |
| |
| clear_bit(NFS_DELEGATED_STATE, &state->flags); |
| clear_bit(NFS_O_RDONLY_STATE, &state->flags); |
| clear_bit(NFS_O_WRONLY_STATE, &state->flags); |
| clear_bit(NFS_O_RDWR_STATE, &state->flags); |
| spin_lock(&state->state_lock); |
| list_for_each_entry(lock, &state->lock_states, ls_locks) { |
| lock->ls_seqid.flags = 0; |
| clear_bit(NFS_LOCK_INITIALIZED, &lock->ls_flags); |
| } |
| spin_unlock(&state->state_lock); |
| } |
| |
| static void nfs4_reset_seqids(struct nfs_server *server, |
| int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state)) |
| { |
| struct nfs_client *clp = server->nfs_client; |
| struct nfs4_state_owner *sp; |
| struct rb_node *pos; |
| struct nfs4_state *state; |
| |
| spin_lock(&clp->cl_lock); |
| for (pos = rb_first(&server->state_owners); |
| pos != NULL; |
| pos = rb_next(pos)) { |
| sp = rb_entry(pos, struct nfs4_state_owner, so_server_node); |
| sp->so_seqid.flags = 0; |
| spin_lock(&sp->so_lock); |
| list_for_each_entry(state, &sp->so_states, open_states) { |
| if (mark_reclaim(clp, state)) |
| nfs4_clear_open_state(state); |
| } |
| spin_unlock(&sp->so_lock); |
| } |
| spin_unlock(&clp->cl_lock); |
| } |
| |
| static void nfs4_state_mark_reclaim_helper(struct nfs_client *clp, |
| int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state)) |
| { |
| struct nfs_server *server; |
| |
| rcu_read_lock(); |
| list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) |
| nfs4_reset_seqids(server, mark_reclaim); |
| rcu_read_unlock(); |
| } |
| |
| static void nfs4_state_start_reclaim_reboot(struct nfs_client *clp) |
| { |
| /* Mark all delegations for reclaim */ |
| nfs_delegation_mark_reclaim(clp); |
| nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_reboot); |
| } |
| |
| static void nfs4_reclaim_complete(struct nfs_client *clp, |
| const struct nfs4_state_recovery_ops *ops, |
| struct rpc_cred *cred) |
| { |
| /* Notify the server we're done reclaiming our state */ |
| if (ops->reclaim_complete) |
| (void)ops->reclaim_complete(clp, cred); |
| } |
| |
| static void nfs4_clear_reclaim_server(struct nfs_server *server) |
| { |
| struct nfs_client *clp = server->nfs_client; |
| struct nfs4_state_owner *sp; |
| struct rb_node *pos; |
| struct nfs4_state *state; |
| |
| spin_lock(&clp->cl_lock); |
| for (pos = rb_first(&server->state_owners); |
| pos != NULL; |
| pos = rb_next(pos)) { |
| sp = rb_entry(pos, struct nfs4_state_owner, so_server_node); |
| spin_lock(&sp->so_lock); |
| list_for_each_entry(state, &sp->so_states, open_states) { |
| if (!test_and_clear_bit(NFS_STATE_RECLAIM_REBOOT, |
| &state->flags)) |
| continue; |
| nfs4_state_mark_reclaim_nograce(clp, state); |
| } |
| spin_unlock(&sp->so_lock); |
| } |
| spin_unlock(&clp->cl_lock); |
| } |
| |
| static int nfs4_state_clear_reclaim_reboot(struct nfs_client *clp) |
| { |
| struct nfs_server *server; |
| |
| if (!test_and_clear_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) |
| return 0; |
| |
| rcu_read_lock(); |
| list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) |
| nfs4_clear_reclaim_server(server); |
| rcu_read_unlock(); |
| |
| nfs_delegation_reap_unclaimed(clp); |
| return 1; |
| } |
| |
| static void nfs4_state_end_reclaim_reboot(struct nfs_client *clp) |
| { |
| const struct nfs4_state_recovery_ops *ops; |
| struct rpc_cred *cred; |
| |
| if (!nfs4_state_clear_reclaim_reboot(clp)) |
| return; |
| ops = clp->cl_mvops->reboot_recovery_ops; |
| cred = nfs4_get_clid_cred(clp); |
| nfs4_reclaim_complete(clp, ops, cred); |
| put_rpccred(cred); |
| } |
| |
| static void nfs_delegation_clear_all(struct nfs_client *clp) |
| { |
| nfs_delegation_mark_reclaim(clp); |
| nfs_delegation_reap_unclaimed(clp); |
| } |
| |
| static void nfs4_state_start_reclaim_nograce(struct nfs_client *clp) |
| { |
| nfs_delegation_clear_all(clp); |
| nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_nograce); |
| } |
| |
| static int nfs4_recovery_handle_error(struct nfs_client *clp, int error) |
| { |
| switch (error) { |
| case 0: |
| break; |
| case -NFS4ERR_CB_PATH_DOWN: |
| nfs40_handle_cb_pathdown(clp); |
| break; |
| case -NFS4ERR_NO_GRACE: |
| nfs4_state_end_reclaim_reboot(clp); |
| break; |
| case -NFS4ERR_STALE_CLIENTID: |
| 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_SEQ_FALSE_RETRY: |
| case -NFS4ERR_SEQ_MISORDERED: |
| set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state); |
| /* Zero session reset errors */ |
| break; |
| case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: |
| set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state); |
| break; |
| default: |
| dprintk("%s: failed to handle error %d for server %s\n", |
| __func__, error, clp->cl_hostname); |
| return error; |
| } |
| dprintk("%s: handled error %d for server %s\n", __func__, error, |
| clp->cl_hostname); |
| return 0; |
| } |
| |
| static int nfs4_do_reclaim(struct nfs_client *clp, const struct nfs4_state_recovery_ops *ops) |
| { |
| struct nfs4_state_owner *sp; |
| struct nfs_server *server; |
| struct rb_node *pos; |
| int status = 0; |
| |
| restart: |
| rcu_read_lock(); |
| list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { |
| nfs4_purge_state_owners(server); |
| spin_lock(&clp->cl_lock); |
| for (pos = rb_first(&server->state_owners); |
| pos != NULL; |
| pos = rb_next(pos)) { |
| sp = rb_entry(pos, |
| struct nfs4_state_owner, so_server_node); |
| if (!test_and_clear_bit(ops->owner_flag_bit, |
| &sp->so_flags)) |
| continue; |
| 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; |
| |
| /* 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_clear_reclaim_reboot(clp); |
| 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; |
| |
| 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; |
| } |
| |
| /** |
| * nfs4_discover_server_trunking - Detect server IP address trunking |
| * |
| * @clp: nfs_client under test |
| * @result: OUT: found nfs_client, or clp |
| * |
| * Returns zero or a negative errno. If zero is returned, |
| * an nfs_client pointer is planted in "result". |
| * |
| * Note: since we are invoked in process context, and |
| * not from inside the state manager, we cannot use |
| * nfs4_handle_reclaim_lease_error(). |
| */ |
| int nfs4_discover_server_trunking(struct nfs_client *clp, |
| struct nfs_client **result) |
| { |
| const struct nfs4_state_recovery_ops *ops = |
| clp->cl_mvops->reboot_recovery_ops; |
| struct rpc_clnt *clnt; |
| struct rpc_cred *cred; |
| int i, status; |
| |
| dprintk("NFS: %s: testing '%s'\n", __func__, clp->cl_hostname); |
| |
| clnt = clp->cl_rpcclient; |
| i = 0; |
| |
| mutex_lock(&nfs_clid_init_mutex); |
| again: |
| status = -ENOENT; |
| cred = nfs4_get_clid_cred(clp); |
| if (cred == NULL) |
| goto out_unlock; |
| |
| status = ops->detect_trunking(clp, result, cred); |
| put_rpccred(cred); |
| switch (status) { |
| case 0: |
| break; |
| case -NFS4ERR_DELAY: |
| case -ETIMEDOUT: |
| case -EAGAIN: |
| ssleep(1); |
| case -NFS4ERR_STALE_CLIENTID: |
| dprintk("NFS: %s after status %d, retrying\n", |
| __func__, status); |
| goto again; |
| case -EACCES: |
| if (i++ == 0) { |
| nfs4_root_machine_cred(clp); |
| goto again; |
| } |
| if (i > 2) |
| break; |
| case -NFS4ERR_CLID_INUSE: |
| case -NFS4ERR_WRONGSEC: |
| clnt = rpc_clone_client_set_auth(clnt, RPC_AUTH_UNIX); |
| if (IS_ERR(clnt)) { |
| status = PTR_ERR(clnt); |
| break; |
| } |
| /* Note: this is safe because we haven't yet marked the |
| * client as ready, so we are the only user of |
| * clp->cl_rpcclient |
| */ |
| clnt = xchg(&clp->cl_rpcclient, clnt); |
| rpc_shutdown_client(clnt); |
| clnt = clp->cl_rpcclient; |
| goto again; |
| |
| case -NFS4ERR_MINOR_VERS_MISMATCH: |
| status = -EPROTONOSUPPORT; |
| break; |
| |
| case -EKEYEXPIRED: |
| case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery |
| * in nfs4_exchange_id */ |
| status = -EKEYEXPIRED; |
| break; |
| default: |
| pr_warn("NFS: %s unhandled error %d. Exiting with error EIO\n", |
| __func__, status); |
| status = -EIO; |
| } |
| |
| out_unlock: |
| mutex_unlock(&nfs_clid_init_mutex); |
| dprintk("NFS: %s: status = %d\n", __func__, status); |
| return status; |
| } |
| |
| #ifdef CONFIG_NFS_V4_1 |
| void nfs4_schedule_session_recovery(struct nfs4_session *session, int err) |
| { |
| struct nfs_client *clp = session->clp; |
| |
| switch (err) { |
| default: |
| set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state); |
| break; |
| case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: |
| set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state); |
| } |
| nfs4_schedule_lease_recovery(clp); |
| } |
| EXPORT_SYMBOL_GPL(nfs4_schedule_session_recovery); |
| |
| static void nfs41_ping_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); |
| } |
| |
| void nfs41_server_notify_target_slotid_update(struct nfs_client *clp) |
| { |
| nfs41_ping_server(clp); |
| } |
| |
| void nfs41_server_notify_highest_slotid_update(struct nfs_client *clp) |
| { |
| nfs41_ping_server(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_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_recallable_state_revoked(struct nfs_client *clp) |
| { |
| /* This will need to handle layouts too */ |
| nfs_expire_all_delegations(clp); |
| dprintk("%s: Recallable state revoked on server %s!\n", __func__, |
| clp->cl_hostname); |
| } |
| |
| static void nfs41_handle_backchannel_fault(struct nfs_client *clp) |
| { |
| nfs_expire_all_delegations(clp); |
| if (test_and_set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state) == 0) |
| nfs4_schedule_state_manager(clp); |
| dprintk("%s: server %s declared a backchannel fault\n", __func__, |
| clp->cl_hostname); |
| } |
| |
| static void nfs41_handle_cb_path_down(struct nfs_client *clp) |
| { |
| if (test_and_set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, |
| &clp->cl_state) == 0) |
| nfs4_schedule_state_manager(clp); |
| } |
| |
| void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags) |
| { |
| if (!flags) |
| return; |
| |
| dprintk("%s: \"%s\" (client ID %llx) flags=0x%08x\n", |
| __func__, clp->cl_hostname, clp->cl_clientid, flags); |
| |
| if (flags & SEQ4_STATUS_RESTART_RECLAIM_NEEDED) |
| nfs41_handle_server_reboot(clp); |
| if (flags & (SEQ4_STATUS_EXPIRED_ALL_STATE_REVOKED | |
| SEQ4_STATUS_EXPIRED_SOME_STATE_REVOKED | |
| SEQ4_STATUS_ADMIN_STATE_REVOKED | |
| SEQ4_STATUS_LEASE_MOVED)) |
| nfs41_handle_state_revoked(clp); |
| if (flags & SEQ4_STATUS_RECALLABLE_STATE_REVOKED) |
| nfs41_handle_recallable_state_revoked(clp); |
| if (flags & SEQ4_STATUS_BACKCHANNEL_FAULT) |
| nfs41_handle_backchannel_fault(clp); |
| else if (flags & (SEQ4_STATUS_CB_PATH_DOWN | |
| SEQ4_STATUS_CB_PATH_DOWN_SESSION)) |
| nfs41_handle_cb_path_down(clp); |
| } |
| |
| static int nfs4_reset_session(struct nfs_client *clp) |
| { |
| struct rpc_cred *cred; |
| int status; |
| |
| if (!nfs4_has_session(clp)) |
| return 0; |
| nfs4_begin_drain_session(clp); |
| cred = nfs4_get_clid_cred(clp); |
| status = nfs4_proc_destroy_session(clp->cl_session, cred); |
| switch (status) { |
| case 0: |
| case -NFS4ERR_BADSESSION: |
| case -NFS4ERR_DEADSESSION: |
| break; |
| case -NFS4ERR_BACK_CHAN_BUSY: |
| case -NFS4ERR_DELAY: |
| set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state); |
| status = 0; |
| ssleep(1); |
| goto out; |
| default: |
| status = nfs4_recovery_handle_error(clp, status); |
| goto out; |
| } |
| |
| memset(clp->cl_session->sess_id.data, 0, NFS4_MAX_SESSIONID_LEN); |
| status = nfs4_proc_create_session(clp, cred); |
| if (status) { |
| dprintk("%s: session reset failed with status %d for server %s!\n", |
| __func__, status, clp->cl_hostname); |
| status = nfs4_handle_reclaim_lease_error(clp, status); |
| goto out; |
| } |
| nfs41_finish_session_reset(clp); |
| dprintk("%s: session reset was successful for server %s!\n", |
| __func__, clp->cl_hostname); |
| out: |
| if (cred) |
| put_rpccred(cred); |
| return status; |
| } |
| |
| static int nfs4_bind_conn_to_session(struct nfs_client *clp) |
| { |
| struct rpc_cred *cred; |
| int ret; |
| |
| if (!nfs4_has_session(clp)) |
| return 0; |
| nfs4_begin_drain_session(clp); |
| cred = nfs4_get_clid_cred(clp); |
| ret = nfs4_proc_bind_conn_to_session(clp, cred); |
| if (cred) |
| put_rpccred(cred); |
| clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state); |
| switch (ret) { |
| case 0: |
| dprintk("%s: bind_conn_to_session was successful for server %s!\n", |
| __func__, clp->cl_hostname); |
| break; |
| case -NFS4ERR_DELAY: |
| ssleep(1); |
| set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state); |
| break; |
| default: |
| return nfs4_recovery_handle_error(clp, ret); |
| } |
| return 0; |
| } |
| #else /* CONFIG_NFS_V4_1 */ |
| static int nfs4_reset_session(struct nfs_client *clp) { return 0; } |
| static void nfs4_end_drain_session(struct nfs_client *clp) { } |
| |
| static int nfs4_bind_conn_to_session(struct nfs_client *clp) |
| { |
| return 0; |
| } |
| #endif /* CONFIG_NFS_V4_1 */ |
| |
| static void nfs4_state_manager(struct nfs_client *clp) |
| { |
| int status = 0; |
| const char *section = "", *section_sep = ""; |
| |
| /* Ensure exclusive access to NFSv4 state */ |
| do { |
| if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) { |
| section = "purge state"; |
| status = nfs4_purge_lease(clp); |
| if (status < 0) |
| goto out_error; |
| continue; |
| } |
| |
| if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) { |
| section = "lease expired"; |
| /* We're going to have to re-establish a clientid */ |
| status = nfs4_reclaim_lease(clp); |
| if (status < 0) |
| goto out_error; |
| continue; |
| } |
| |
| /* Initialize or reset the session */ |
| if (test_and_clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state)) { |
| section = "reset session"; |
| status = nfs4_reset_session(clp); |
| if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) |
| continue; |
| if (status < 0) |
| goto out_error; |
| } |
| |
| /* Send BIND_CONN_TO_SESSION */ |
| if (test_and_clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION, |
| &clp->cl_state)) { |
| section = "bind conn to session"; |
| status = nfs4_bind_conn_to_session(clp); |
| if (status < 0) |
| goto out_error; |
| continue; |
| } |
| |
| if (test_and_clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state)) { |
| section = "check lease"; |
| status = nfs4_check_lease(clp); |
| if (status < 0) |
| goto out_error; |
| continue; |
| } |
| |
| /* 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 (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) || |
| test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state)) |
| continue; |
| nfs4_state_end_reclaim_reboot(clp); |
| if (test_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state)) |
| continue; |
| if (status < 0) |
| goto out_error; |
| } |
| |
| /* 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 (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) || |
| test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state) || |
| test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) |
| continue; |
| if (status < 0) |
| goto out_error; |
| } |
| |
| nfs4_end_drain_session(clp); |
| if (test_and_clear_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state)) { |
| nfs_client_return_marked_delegations(clp); |
| continue; |
| } |
| |
| nfs4_clear_state_manager_bit(clp); |
| /* Did we race with an attempt to give us more work? */ |
| if (clp->cl_state == 0) |
| break; |
| if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0) |
| break; |
| } while (atomic_read(&clp->cl_count) > 1); |
| return; |
| out_error: |
| if (strlen(section)) |
| section_sep = ": "; |
| pr_warn_ratelimited("NFS: state manager%s%s failed on NFSv4 server %s" |
| " with error %d\n", section_sep, section, |
| clp->cl_hostname, -status); |
| ssleep(1); |
| nfs4_end_drain_session(clp); |
| nfs4_clear_state_manager_bit(clp); |
| } |
| |
| static int nfs4_run_state_manager(void *ptr) |
| { |
| struct nfs_client *clp = ptr; |
| |
| allow_signal(SIGKILL); |
| nfs4_state_manager(clp); |
| nfs_put_client(clp); |
| module_put_and_exit(0); |
| return 0; |
| } |
| |
| /* |
| * Local variables: |
| * c-basic-offset: 8 |
| * End: |
| */ |