/* * 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 "nfs4_fs.h" #include "callback.h" #include "delegation.h" #include "internal.h" #include "pnfs.h" #define OPENOWNER_POOL_SIZE 8 const nfs4_stateid zero_stateid; static LIST_HEAD(nfs4_clientid_list); int nfs4_init_clientid(struct nfs_client *clp, struct rpc_cred *cred) { struct nfs4_setclientid_res clid; unsigned short port; int status; port = nfs_callback_tcpport; if (clp->cl_addr.ss_family == AF_INET6) port = nfs_callback_tcpport6; status = nfs4_proc_setclientid(clp, NFS4_CALLBACK, port, cred, &clid); if (status != 0) goto out; status = nfs4_proc_setclientid_confirm(clp, &clid, cred); if (status != 0) goto out; clp->cl_clientid = clid.clientid; nfs4_schedule_state_renewal(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_clear_machine_cred(struct nfs_client *clp) { struct rpc_cred *cred; spin_lock(&clp->cl_lock); cred = clp->cl_machine_cred; clp->cl_machine_cred = NULL; 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; 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(); return cred; } #if defined(CONFIG_NFS_V4_1) static int nfs41_setup_state_renewal(struct nfs_client *clp) { int status; struct nfs_fsinfo fsinfo; 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; } /* * Back channel returns NFS4ERR_DELAY for new requests when * NFS4_SESSION_DRAINING is set so there is no work to be done when draining * is ended. */ static void nfs4_end_drain_session(struct nfs_client *clp) { struct nfs4_session *ses = clp->cl_session; int max_slots; if (ses == NULL) return; if (test_and_clear_bit(NFS4_SESSION_DRAINING, &ses->session_state)) { spin_lock(&ses->fc_slot_table.slot_tbl_lock); max_slots = ses->fc_slot_table.max_slots; while (max_slots--) { struct rpc_task *task; task = rpc_wake_up_next(&ses->fc_slot_table. slot_tbl_waitq); if (!task) break; rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED); } spin_unlock(&ses->fc_slot_table.slot_tbl_lock); } } static int nfs4_wait_on_slot_tbl(struct nfs4_slot_table *tbl) { spin_lock(&tbl->slot_tbl_lock); if (tbl->highest_used_slotid != -1) { 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; set_bit(NFS4_SESSION_DRAINING, &ses->session_state); /* back channel */ ret = nfs4_wait_on_slot_tbl(&ses->bc_slot_table); if (ret) return ret; /* fore channel */ return nfs4_wait_on_slot_tbl(&ses->fc_slot_table); } int nfs41_init_clientid(struct nfs_client *clp, struct rpc_cred *cred) { int status; nfs4_begin_drain_session(clp); status = nfs4_proc_exchange_id(clp, cred); if (status != 0) goto out; status = nfs4_proc_create_session(clp); if (status != 0) goto out; nfs41_setup_state_renewal(clp); nfs_mark_client_ready(clp, NFS_CS_READY); out: return status; } struct rpc_cred *nfs4_get_exchange_id_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; } #endif /* CONFIG_NFS_V4_1 */ static struct rpc_cred * nfs4_get_setclientid_cred_server(struct nfs_server *server) { struct nfs_client *clp = server->nfs_client; struct rpc_cred *cred = NULL; struct nfs4_state_owner *sp; struct rb_node *pos; spin_lock(&clp->cl_lock); pos = rb_first(&server->state_owners); if (pos != NULL) { sp = rb_entry(pos, struct nfs4_state_owner, so_server_node); cred = get_rpccred(sp->so_cred); } spin_unlock(&clp->cl_lock); return cred; } /** * nfs4_get_setclientid_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_setclientid_cred(struct nfs_client *clp) { struct nfs_server *server; struct rpc_cred *cred; spin_lock(&clp->cl_lock); cred = nfs4_get_machine_cred_locked(clp); spin_unlock(&clp->cl_lock); if (cred != NULL) goto out; rcu_read_lock(); list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { cred = nfs4_get_setclientid_cred_server(server); if (cred != NULL) break; } rcu_read_unlock(); out: return cred; } static void nfs_alloc_unique_id_locked(struct rb_root *root, struct nfs_unique_id *new, __u64 minval, int maxbits) { struct rb_node **p, *parent; struct nfs_unique_id *pos; __u64 mask = ~0ULL; if (maxbits < 64) mask = (1ULL << maxbits) - 1ULL; /* Ensure distribution is more or less flat */ get_random_bytes(&new->id, sizeof(new->id)); new->id &= mask; if (new->id < minval) new->id += minval; retry: p = &root->rb_node; parent = NULL; while (*p != NULL) { parent = *p; pos = rb_entry(parent, struct nfs_unique_id, rb_node); if (new->id < pos->id) p = &(*p)->rb_left; else if (new->id > pos->id) p = &(*p)->rb_right; else goto id_exists; } rb_link_node(&new->rb_node, parent, p); rb_insert_color(&new->rb_node, root); return; id_exists: for (;;) { new->id++; if (new->id < minval || (new->id & mask) != new->id) { new->id = minval; break; } parent = rb_next(parent); if (parent == NULL) break; pos = rb_entry(parent, struct nfs_unique_id, rb_node); if (new->id < pos->id) break; } goto retry; } static void nfs_free_unique_id(struct rb_root *root, struct nfs_unique_id *id) { rb_erase(&id->rb_node, root); } 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, *res = NULL; while (*p != NULL) { parent = *p; sp = rb_entry(parent, struct nfs4_state_owner, so_server_node); if (server < sp->so_server) { p = &parent->rb_left; continue; } if (server > sp->so_server) { p = &parent->rb_right; continue; } if (cred < sp->so_cred) p = &parent->rb_left; else if (cred > sp->so_cred) p = &parent->rb_right; else { atomic_inc(&sp->so_count); res = sp; break; } } return res; } 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 { atomic_inc(&sp->so_count); return sp; } } nfs_alloc_unique_id_locked(&server->openowner_id, &new->so_owner_id, 1, 64); 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); nfs_free_unique_id(&server->openowner_id, &sp->so_owner_id); } /* * 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(void) { struct nfs4_state_owner *sp; sp = kzalloc(sizeof(*sp),GFP_NOFS); if (!sp) return NULL; spin_lock_init(&sp->so_lock); INIT_LIST_HEAD(&sp->so_states); rpc_init_wait_queue(&sp->so_sequence.wait, "Seqid_waitqueue"); sp->so_seqid.sequence = &sp->so_sequence; spin_lock_init(&sp->so_sequence.lock); INIT_LIST_HEAD(&sp->so_sequence.list); atomic_set(&sp->so_count, 1); return sp; } static void nfs4_drop_state_owner(struct nfs4_state_owner *sp) { if (!RB_EMPTY_NODE(&sp->so_server_node)) { struct nfs_server *server = sp->so_server; struct nfs_client *clp = server->nfs_client; spin_lock(&clp->cl_lock); rb_erase(&sp->so_server_node, &server->state_owners); RB_CLEAR_NODE(&sp->so_server_node); spin_unlock(&clp->cl_lock); } } /** * 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) { 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) return sp; new = nfs4_alloc_state_owner(); if (new == NULL) return NULL; new->so_server = server; new->so_cred = cred; spin_lock(&clp->cl_lock); sp = nfs4_insert_state_owner_locked(new); spin_unlock(&clp->cl_lock); if (sp == new) get_rpccred(cred); else { rpc_destroy_wait_queue(&new->so_sequence.wait); kfree(new); } return sp; } /** * nfs4_put_state_owner - Release a nfs4_state_owner * @sp: state owner data to release * */ void nfs4_put_state_owner(struct nfs4_state_owner *sp) { struct nfs_client *clp = sp->so_server->nfs_client; struct rpc_cred *cred = sp->so_cred; if (!atomic_dec_and_lock(&sp->so_count, &clp->cl_lock)) return; nfs4_remove_state_owner_locked(sp); spin_unlock(&clp->cl_lock); rpc_destroy_wait_queue(&sp->so_sequence.wait); put_rpccred(cred); kfree(sp); } static struct nfs4_state * nfs4_alloc_open_state(void) { struct nfs4_state *state; state = kzalloc(sizeof(*state), GFP_NOFS); if (!state) return NULL; atomic_set(&state->count, 1); INIT_LIST_HEAD(&state->lock_states); spin_lock_init(&state->state_lock); seqlock_init(&state->seqlock); return state; } void nfs4_state_set_mode_locked(struct nfs4_state *state, fmode_t fmode) { if (state->state == fmode) return; /* NB! List reordering - see the reclaim code for why. */ if ((fmode & FMODE_WRITE) != (state->state & FMODE_WRITE)) { if (fmode & FMODE_WRITE) list_move(&state->open_states, &state->owner->so_states); else list_move_tail(&state->open_states, &state->owner->so_states); } state->state = fmode; } static struct nfs4_state * __nfs4_find_state_byowner(struct inode *inode, struct nfs4_state_owner *owner) { struct nfs_inode *nfsi = NFS_I(inode); struct nfs4_state *state; list_for_each_entry(state, &nfsi->open_states, inode_states) { if (state->owner != owner) continue; if (atomic_inc_not_zero(&state->count)) return state; } return NULL; } static void nfs4_free_open_state(struct nfs4_state *state) { kfree(state); } struct nfs4_state * nfs4_get_open_state(struct inode *inode, struct nfs4_state_owner *owner) { struct nfs4_state *state, *new; struct nfs_inode *nfsi = NFS_I(inode); spin_lock(&inode->i_lock); state = __nfs4_find_state_byowner(inode, owner); spin_unlock(&inode->i_lock); if (state) goto out; new = nfs4_alloc_open_state(); spin_lock(&owner->so_lock); spin_lock(&inode->i_lock); state = __nfs4_find_state_byowner(inode, owner); if (state == NULL && new != NULL) { state = new; state->owner = owner; atomic_inc(&owner->so_count); list_add(&state->inode_states, &nfsi->open_states); state->inode = igrab(inode); spin_unlock(&inode->i_lock); /* Note: The reclaim code dictates that we add stateless * and read-only stateids to the end of the list */ list_add_tail(&state->open_states, &owner->so_states); spin_unlock(&owner->so_lock); } else { spin_unlock(&inode->i_lock); spin_unlock(&owner->so_lock); if (new) nfs4_free_open_state(new); } out: return state; } void nfs4_put_open_state(struct nfs4_state *state) { struct inode *inode = state->inode; struct nfs4_state_owner *owner = state->owner; if (!atomic_dec_and_lock(&state->count, &owner->so_lock)) return; spin_lock(&inode->i_lock); list_del(&state->inode_states); list_del(&state->open_states); spin_unlock(&inode->i_lock); spin_unlock(&owner->so_lock); iput(inode); nfs4_free_open_state(state); nfs4_put_state_owner(owner); } /* * Close the current file. */ static void __nfs4_close(struct path *path, struct nfs4_state *state, fmode_t fmode, gfp_t gfp_mask, int wait) { struct nfs4_state_owner *owner = state->owner; int call_close = 0; fmode_t newstate; atomic_inc(&owner->so_count); /* Protect against nfs4_find_state() */ spin_lock(&owner->so_lock); switch (fmode & (FMODE_READ | FMODE_WRITE)) { case FMODE_READ: state->n_rdonly--; break; case FMODE_WRITE: state->n_wronly--; break; case FMODE_READ|FMODE_WRITE: state->n_rdwr--; } newstate = FMODE_READ|FMODE_WRITE; if (state->n_rdwr == 0) { if (state->n_rdonly == 0) { newstate &= ~FMODE_READ; call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags); call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags); } if (state->n_wronly == 0) { newstate &= ~FMODE_WRITE; call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags); call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags); } if (newstate == 0) clear_bit(NFS_DELEGATED_STATE, &state->flags); } nfs4_state_set_mode_locked(state, newstate); spin_unlock(&owner->so_lock); if (!call_close) { nfs4_put_open_state(state); nfs4_put_state_owner(owner); } else { bool roc = pnfs_roc(state->inode); nfs4_do_close(path, state, gfp_mask, wait, roc); } } void nfs4_close_state(struct path *path, struct nfs4_state *state, fmode_t fmode) { __nfs4_close(path, state, fmode, GFP_NOFS, 0); } void nfs4_close_sync(struct path *path, struct nfs4_state *state, fmode_t fmode) { __nfs4_close(path, state, fmode, GFP_KERNEL, 1); } /* * Search the state->lock_states for an existing lock_owner * that is compatible with current->files */ static struct nfs4_lock_state * __nfs4_find_lock_state(struct nfs4_state *state, fl_owner_t fl_owner, pid_t fl_pid, unsigned int type) { struct nfs4_lock_state *pos; list_for_each_entry(pos, &state->lock_states, ls_locks) { if (type != NFS4_ANY_LOCK_TYPE && pos->ls_owner.lo_type != type) continue; switch (pos->ls_owner.lo_type) { case NFS4_POSIX_LOCK_TYPE: if (pos->ls_owner.lo_u.posix_owner != fl_owner) continue; break; case NFS4_FLOCK_LOCK_TYPE: if (pos->ls_owner.lo_u.flock_owner != fl_pid) continue; } atomic_inc(&pos->ls_count); return pos; } return NULL; } /* * Return a compatible lock_state. If no initialized lock_state structure * exists, return an uninitialized one. * */ static struct nfs4_lock_state *nfs4_alloc_lock_state(struct nfs4_state *state, fl_owner_t fl_owner, pid_t fl_pid, unsigned int type) { struct nfs4_lock_state *lsp; struct nfs_server *server = state->owner->so_server; struct nfs_client *clp = server->nfs_client; lsp = kzalloc(sizeof(*lsp), GFP_NOFS); if (lsp == NULL) return NULL; rpc_init_wait_queue(&lsp->ls_sequence.wait, "lock_seqid_waitqueue"); spin_lock_init(&lsp->ls_sequence.lock); INIT_LIST_HEAD(&lsp->ls_sequence.list); lsp->ls_seqid.sequence = &lsp->ls_sequence; atomic_set(&lsp->ls_count, 1); lsp->ls_state = state; lsp->ls_owner.lo_type = type; switch (lsp->ls_owner.lo_type) { case NFS4_FLOCK_LOCK_TYPE: lsp->ls_owner.lo_u.flock_owner = fl_pid; break; case NFS4_POSIX_LOCK_TYPE: lsp->ls_owner.lo_u.posix_owner = fl_owner; break; default: kfree(lsp); return NULL; } spin_lock(&clp->cl_lock); nfs_alloc_unique_id_locked(&server->lockowner_id, &lsp->ls_id, 1, 64); spin_unlock(&clp->cl_lock); INIT_LIST_HEAD(&lsp->ls_locks); return lsp; } static void nfs4_free_lock_state(struct nfs4_lock_state *lsp) { struct nfs_server *server = lsp->ls_state->owner->so_server; struct nfs_client *clp = server->nfs_client; spin_lock(&clp->cl_lock); nfs_free_unique_id(&server->lockowner_id, &lsp->ls_id); spin_unlock(&clp->cl_lock); rpc_destroy_wait_queue(&lsp->ls_sequence.wait); kfree(lsp); } /* * Return a compatible lock_state. If no initialized lock_state structure * exists, return an uninitialized one. * */ static struct nfs4_lock_state *nfs4_get_lock_state(struct nfs4_state *state, fl_owner_t owner, pid_t pid, unsigned int type) { struct nfs4_lock_state *lsp, *new = NULL; for(;;) { spin_lock(&state->state_lock); lsp = __nfs4_find_lock_state(state, owner, pid, type); if (lsp != NULL) break; if (new != NULL) { list_add(&new->ls_locks, &state->lock_states); set_bit(LK_STATE_IN_USE, &state->flags); lsp = new; new = NULL; break; } spin_unlock(&state->state_lock); new = nfs4_alloc_lock_state(state, owner, pid, type); if (new == NULL) return NULL; } spin_unlock(&state->state_lock); if (new != NULL) nfs4_free_lock_state(new); return lsp; } /* * Release reference to lock_state, and free it if we see that * it is no longer in use */ void nfs4_put_lock_state(struct nfs4_lock_state *lsp) { struct nfs4_state *state; if (lsp == NULL) return; state = lsp->ls_state; if (!atomic_dec_and_lock(&lsp->ls_count, &state->state_lock)) return; list_del(&lsp->ls_locks); if (list_empty(&state->lock_states)) clear_bit(LK_STATE_IN_USE, &state->flags); spin_unlock(&state->state_lock); if (lsp->ls_flags & NFS_LOCK_INITIALIZED) nfs4_release_lockowner(lsp); nfs4_free_lock_state(lsp); } static void nfs4_fl_copy_lock(struct file_lock *dst, struct file_lock *src) { struct nfs4_lock_state *lsp = src->fl_u.nfs4_fl.owner; dst->fl_u.nfs4_fl.owner = lsp; atomic_inc(&lsp->ls_count); } static void nfs4_fl_release_lock(struct file_lock *fl) { nfs4_put_lock_state(fl->fl_u.nfs4_fl.owner); } static const struct file_lock_operations nfs4_fl_lock_ops = { .fl_copy_lock = nfs4_fl_copy_lock, .fl_release_private = nfs4_fl_release_lock, }; int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl) { struct nfs4_lock_state *lsp; if (fl->fl_ops != NULL) return 0; if (fl->fl_flags & FL_POSIX) lsp = nfs4_get_lock_state(state, fl->fl_owner, 0, NFS4_POSIX_LOCK_TYPE); else if (fl->fl_flags & FL_FLOCK) lsp = nfs4_get_lock_state(state, 0, fl->fl_pid, NFS4_FLOCK_LOCK_TYPE); else return -EINVAL; if (lsp == NULL) return -ENOMEM; fl->fl_u.nfs4_fl.owner = lsp; fl->fl_ops = &nfs4_fl_lock_ops; return 0; } /* * Byte-range lock aware utility to initialize the stateid of read/write * requests. */ void nfs4_copy_stateid(nfs4_stateid *dst, struct nfs4_state *state, fl_owner_t fl_owner, pid_t fl_pid) { struct nfs4_lock_state *lsp; int seq; do { seq = read_seqbegin(&state->seqlock); memcpy(dst, &state->stateid, sizeof(*dst)); } while (read_seqretry(&state->seqlock, seq)); if (test_bit(LK_STATE_IN_USE, &state->flags) == 0) return; spin_lock(&state->state_lock); lsp = __nfs4_find_lock_state(state, fl_owner, fl_pid, NFS4_ANY_LOCK_TYPE); if (lsp != NULL && (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0) memcpy(dst, &lsp->ls_stateid, sizeof(*dst)); spin_unlock(&state->state_lock); nfs4_put_lock_state(lsp); } struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask) { struct nfs_seqid *new; new = kmalloc(sizeof(*new), gfp_mask); if (new != NULL) { new->sequence = counter; INIT_LIST_HEAD(&new->list); } return new; } void nfs_release_seqid(struct nfs_seqid *seqid) { if (!list_empty(&seqid->list)) { struct rpc_sequence *sequence = seqid->sequence->sequence; spin_lock(&sequence->lock); list_del_init(&seqid->list); spin_unlock(&sequence->lock); rpc_wake_up(&sequence->wait); } } void nfs_free_seqid(struct nfs_seqid *seqid) { nfs_release_seqid(seqid); kfree(seqid); } /* * Increment the seqid if the OPEN/OPEN_DOWNGRADE/CLOSE succeeded, or * failed with a seqid incrementing error - * see comments nfs_fs.h:seqid_mutating_error() */ static void nfs_increment_seqid(int status, struct nfs_seqid *seqid) { BUG_ON(list_first_entry(&seqid->sequence->sequence->list, struct nfs_seqid, list) != seqid); switch (status) { case 0: break; case -NFS4ERR_BAD_SEQID: if (seqid->sequence->flags & NFS_SEQID_CONFIRMED) return; printk(KERN_WARNING "NFS: v4 server returned a bad" " sequence-id error on an" " unconfirmed sequence %p!\n", seqid->sequence); case -NFS4ERR_STALE_CLIENTID: case -NFS4ERR_STALE_STATEID: case -NFS4ERR_BAD_STATEID: case -NFS4ERR_BADXDR: case -NFS4ERR_RESOURCE: case -NFS4ERR_NOFILEHANDLE: /* Non-seqid mutating errors */ return; }; /* * Note: no locking needed as we are guaranteed to be first * on the sequence list */ seqid->sequence->counter++; } void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid) { struct nfs4_state_owner *sp = container_of(seqid->sequence, struct nfs4_state_owner, so_seqid); struct nfs_server *server = sp->so_server; if (status == -NFS4ERR_BAD_SEQID) nfs4_drop_state_owner(sp); if (!nfs4_has_session(server->nfs_client)) nfs_increment_seqid(status, seqid); } /* * Increment the seqid if the LOCK/LOCKU succeeded, or * failed with a seqid incrementing error - * see comments nfs_fs.h:seqid_mutating_error() */ void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid) { nfs_increment_seqid(status, seqid); } int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task) { struct rpc_sequence *sequence = seqid->sequence->sequence; int status = 0; spin_lock(&sequence->lock); if (list_empty(&seqid->list)) list_add_tail(&seqid->list, &sequence->list); if (list_first_entry(&sequence->list, struct nfs_seqid, list) == seqid) goto unlock; rpc_sleep_on(&sequence->wait, task, NULL); status = -EAGAIN; unlock: spin_unlock(&sequence->lock); return status; } static int nfs4_run_state_manager(void *); static void nfs4_clear_state_manager_bit(struct nfs_client *clp) { smp_mb__before_clear_bit(); clear_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state); smp_mb__after_clear_bit(); wake_up_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING); rpc_wake_up(&clp->cl_rpcwaitq); } /* * Schedule the nfs_client asynchronous state management routine */ void nfs4_schedule_state_manager(struct nfs_client *clp) { struct task_struct *task; if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0) return; __module_get(THIS_MODULE); atomic_inc(&clp->cl_count); task = kthread_run(nfs4_run_state_manager, clp, "%s-manager", rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR)); if (!IS_ERR(task)) return; nfs4_clear_state_manager_bit(clp); nfs_put_client(clp); module_put(THIS_MODULE); } /* * Schedule a state recovery attempt */ void nfs4_schedule_state_recovery(struct nfs_client *clp) { if (!clp) return; if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state); nfs4_schedule_state_manager(clp); } int nfs4_state_mark_reclaim_reboot(struct nfs_client *clp, struct nfs4_state *state) { set_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags); /* Don't recover state that expired before the reboot */ if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) { clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags); return 0; } set_bit(NFS_OWNER_RECLAIM_REBOOT, &state->owner->so_flags); set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state); return 1; } int nfs4_state_mark_reclaim_nograce(struct nfs_client *clp, struct nfs4_state *state) { set_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags); clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags); set_bit(NFS_OWNER_RECLAIM_NOGRACE, &state->owner->so_flags); set_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state); return 1; } static int nfs4_reclaim_locks(struct nfs4_state *state, const struct nfs4_state_recovery_ops *ops) { struct inode *inode = state->inode; struct nfs_inode *nfsi = NFS_I(inode); struct file_lock *fl; int status = 0; if (inode->i_flock == NULL) return 0; /* Guard against delegation returns and new lock/unlock calls */ down_write(&nfsi->rwsem); /* Protect inode->i_flock using the BKL */ lock_flocks(); for (fl = inode->i_flock; fl != NULL; fl = fl->fl_next) { if (!(fl->fl_flags & (FL_POSIX|FL_FLOCK))) continue; if (nfs_file_open_context(fl->fl_file)->state != state) continue; unlock_flocks(); status = ops->recover_lock(state, fl); switch (status) { case 0: break; case -ESTALE: case -NFS4ERR_ADMIN_REVOKED: case -NFS4ERR_STALE_STATEID: case -NFS4ERR_BAD_STATEID: case -NFS4ERR_EXPIRED: case -NFS4ERR_NO_GRACE: case -NFS4ERR_STALE_CLIENTID: case -NFS4ERR_BADSESSION: case -NFS4ERR_BADSLOT: case -NFS4ERR_BAD_HIGH_SLOT: case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: goto out; default: printk(KERN_ERR "%s: unhandled error %d. Zeroing state\n", __func__, status); case -ENOMEM: case -NFS4ERR_DENIED: case -NFS4ERR_RECLAIM_BAD: case -NFS4ERR_RECLAIM_CONFLICT: /* kill_proc(fl->fl_pid, SIGLOST, 1); */ status = 0; } lock_flocks(); } unlock_flocks(); out: up_write(&nfsi->rwsem); return status; } static int nfs4_reclaim_open_state(struct nfs4_state_owner *sp, const struct nfs4_state_recovery_ops *ops) { struct nfs4_state *state; struct nfs4_lock_state *lock; int status = 0; /* Note: we rely on the sp->so_states list being ordered * so that we always reclaim open(O_RDWR) and/or open(O_WRITE) * states first. * This is needed to ensure that the server won't give us any * read delegations that we have to return if, say, we are * recovering after a network partition or a reboot from a * server that doesn't support a grace period. */ restart: spin_lock(&sp->so_lock); list_for_each_entry(state, &sp->so_states, open_states) { if (!test_and_clear_bit(ops->state_flag_bit, &state->flags)) continue; if (state->state == 0) continue; atomic_inc(&state->count); spin_unlock(&sp->so_lock); status = ops->recover_open(sp, state); if (status >= 0) { status = nfs4_reclaim_locks(state, ops); if (status >= 0) { list_for_each_entry(lock, &state->lock_states, ls_locks) { if (!(lock->ls_flags & NFS_LOCK_INITIALIZED)) printk("%s: Lock reclaim failed!\n", __func__); } nfs4_put_open_state(state); goto restart; } } switch (status) { default: printk(KERN_ERR "%s: unhandled error %d. Zeroing state\n", __func__, status); case -ENOENT: case -ENOMEM: case -ESTALE: /* * Open state on this file cannot be recovered * All we can do is revert to using the zero stateid. */ memset(state->stateid.data, 0, sizeof(state->stateid.data)); /* Mark the file as being 'closed' */ state->state = 0; break; case -EKEYEXPIRED: /* * User RPCSEC_GSS context has expired. * We cannot recover this stateid now, so * skip it and allow recovery thread to * proceed. */ break; case -NFS4ERR_ADMIN_REVOKED: case -NFS4ERR_STALE_STATEID: case -NFS4ERR_BAD_STATEID: case -NFS4ERR_RECLAIM_BAD: case -NFS4ERR_RECLAIM_CONFLICT: nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state); break; case -NFS4ERR_EXPIRED: case -NFS4ERR_NO_GRACE: nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state); case -NFS4ERR_STALE_CLIENTID: case -NFS4ERR_BADSESSION: case -NFS4ERR_BADSLOT: case -NFS4ERR_BAD_HIGH_SLOT: case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: goto out_err; } nfs4_put_open_state(state); goto restart; } spin_unlock(&sp->so_lock); return 0; out_err: nfs4_put_open_state(state); return status; } static void nfs4_clear_open_state(struct nfs4_state *state) { struct nfs4_lock_state *lock; clear_bit(NFS_DELEGATED_STATE, &state->flags); clear_bit(NFS_O_RDONLY_STATE, &state->flags); clear_bit(NFS_O_WRONLY_STATE, &state->flags); clear_bit(NFS_O_RDWR_STATE, &state->flags); list_for_each_entry(lock, &state->lock_states, ls_locks) { lock->ls_seqid.flags = 0; lock->ls_flags &= ~NFS_LOCK_INITIALIZED; } } static void nfs4_reset_seqids(struct nfs_server *server, int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state)) { struct nfs_client *clp = server->nfs_client; struct nfs4_state_owner *sp; struct rb_node *pos; struct nfs4_state *state; spin_lock(&clp->cl_lock); for (pos = rb_first(&server->state_owners); pos != NULL; pos = rb_next(pos)) { sp = rb_entry(pos, struct nfs4_state_owner, so_server_node); sp->so_seqid.flags = 0; spin_lock(&sp->so_lock); list_for_each_entry(state, &sp->so_states, open_states) { if (mark_reclaim(clp, state)) nfs4_clear_open_state(state); } spin_unlock(&sp->so_lock); } spin_unlock(&clp->cl_lock); } static void nfs4_state_mark_reclaim_helper(struct nfs_client *clp, int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state)) { struct nfs_server *server; rcu_read_lock(); list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) nfs4_reset_seqids(server, mark_reclaim); rcu_read_unlock(); } static void nfs4_state_start_reclaim_reboot(struct nfs_client *clp) { /* Mark all delegations for reclaim */ nfs_delegation_mark_reclaim(clp); nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_reboot); } static void nfs4_reclaim_complete(struct nfs_client *clp, const struct nfs4_state_recovery_ops *ops) { /* Notify the server we're done reclaiming our state */ if (ops->reclaim_complete) (void)ops->reclaim_complete(clp); } static void nfs4_clear_reclaim_server(struct nfs_server *server) { struct nfs_client *clp = server->nfs_client; struct nfs4_state_owner *sp; struct rb_node *pos; struct nfs4_state *state; spin_lock(&clp->cl_lock); for (pos = rb_first(&server->state_owners); pos != NULL; pos = rb_next(pos)) { sp = rb_entry(pos, struct nfs4_state_owner, so_server_node); spin_lock(&sp->so_lock); list_for_each_entry(state, &sp->so_states, open_states) { if (!test_and_clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags)) continue; nfs4_state_mark_reclaim_nograce(clp, state); } spin_unlock(&sp->so_lock); } spin_unlock(&clp->cl_lock); } static int nfs4_state_clear_reclaim_reboot(struct nfs_client *clp) { struct nfs_server *server; if (!test_and_clear_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) return 0; rcu_read_lock(); list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) nfs4_clear_reclaim_server(server); rcu_read_unlock(); nfs_delegation_reap_unclaimed(clp); return 1; } static void nfs4_state_end_reclaim_reboot(struct nfs_client *clp) { if (!nfs4_state_clear_reclaim_reboot(clp)) return; nfs4_reclaim_complete(clp, clp->cl_mvops->reboot_recovery_ops); } static void nfs_delegation_clear_all(struct nfs_client *clp) { nfs_delegation_mark_reclaim(clp); nfs_delegation_reap_unclaimed(clp); } static void nfs4_state_start_reclaim_nograce(struct nfs_client *clp) { nfs_delegation_clear_all(clp); nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_nograce); } static void nfs4_warn_keyexpired(const char *s) { printk_ratelimited(KERN_WARNING "Error: state manager" " encountered RPCSEC_GSS session" " expired against NFSv4 server %s.\n", s); } static int nfs4_recovery_handle_error(struct nfs_client *clp, int error) { switch (error) { case -NFS4ERR_CB_PATH_DOWN: nfs_handle_cb_pathdown(clp); return 0; case -NFS4ERR_NO_GRACE: nfs4_state_end_reclaim_reboot(clp); return 0; case -NFS4ERR_STALE_CLIENTID: case -NFS4ERR_LEASE_MOVED: set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); nfs4_state_clear_reclaim_reboot(clp); nfs4_state_start_reclaim_reboot(clp); break; case -NFS4ERR_EXPIRED: set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); nfs4_state_start_reclaim_nograce(clp); break; case -NFS4ERR_BADSESSION: case -NFS4ERR_BADSLOT: case -NFS4ERR_BAD_HIGH_SLOT: case -NFS4ERR_DEADSESSION: case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: case -NFS4ERR_SEQ_FALSE_RETRY: case -NFS4ERR_SEQ_MISORDERED: set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state); /* Zero session reset errors */ return 0; case -EKEYEXPIRED: /* Nothing we can do */ nfs4_warn_keyexpired(clp->cl_hostname); return 0; } return error; } static int nfs4_do_reclaim(struct nfs_client *clp, const struct nfs4_state_recovery_ops *ops) { struct nfs4_state_owner *sp; struct nfs_server *server; struct rb_node *pos; int status = 0; restart: rcu_read_lock(); list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { spin_lock(&clp->cl_lock); for (pos = rb_first(&server->state_owners); pos != NULL; pos = rb_next(pos)) { sp = rb_entry(pos, struct nfs4_state_owner, so_server_node); if (!test_and_clear_bit(ops->owner_flag_bit, &sp->so_flags)) continue; atomic_inc(&sp->so_count); spin_unlock(&clp->cl_lock); rcu_read_unlock(); status = nfs4_reclaim_open_state(sp, ops); if (status < 0) { set_bit(ops->owner_flag_bit, &sp->so_flags); nfs4_put_state_owner(sp); return nfs4_recovery_handle_error(clp, status); } nfs4_put_state_owner(sp); goto restart; } spin_unlock(&clp->cl_lock); } rcu_read_unlock(); return status; } static int nfs4_check_lease(struct nfs_client *clp) { struct rpc_cred *cred; const struct nfs4_state_maintenance_ops *ops = clp->cl_mvops->state_renewal_ops; int status = -NFS4ERR_EXPIRED; /* Is the client already known to have an expired lease? */ if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) return 0; spin_lock(&clp->cl_lock); cred = ops->get_state_renewal_cred_locked(clp); spin_unlock(&clp->cl_lock); if (cred == NULL) { cred = nfs4_get_setclientid_cred(clp); if (cred == NULL) goto out; } status = ops->renew_lease(clp, cred); put_rpccred(cred); out: return nfs4_recovery_handle_error(clp, status); } static int nfs4_reclaim_lease(struct nfs_client *clp) { struct rpc_cred *cred; const struct nfs4_state_recovery_ops *ops = clp->cl_mvops->reboot_recovery_ops; int status = -ENOENT; cred = ops->get_clid_cred(clp); if (cred != NULL) { status = ops->establish_clid(clp, cred); put_rpccred(cred); /* Handle case where the user hasn't set up machine creds */ if (status == -EACCES && cred == clp->cl_machine_cred) { nfs4_clear_machine_cred(clp); status = -EAGAIN; } if (status == -NFS4ERR_MINOR_VERS_MISMATCH) status = -EPROTONOSUPPORT; } return status; } #ifdef CONFIG_NFS_V4_1 void nfs41_handle_recall_slot(struct nfs_client *clp) { set_bit(NFS4CLNT_RECALL_SLOT, &clp->cl_state); nfs4_schedule_state_recovery(clp); } static void nfs4_reset_all_state(struct nfs_client *clp) { if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) { clp->cl_boot_time = CURRENT_TIME; nfs4_state_start_reclaim_nograce(clp); nfs4_schedule_state_recovery(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); nfs4_schedule_state_recovery(clp); } } static void nfs41_handle_state_revoked(struct nfs_client *clp) { /* Temporary */ nfs4_reset_all_state(clp); } static void nfs41_handle_recallable_state_revoked(struct nfs_client *clp) { /* This will need to handle layouts too */ nfs_expire_all_delegations(clp); } static void nfs41_handle_cb_path_down(struct nfs_client *clp) { nfs_expire_all_delegations(clp); if (test_and_set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state) == 0) nfs4_schedule_state_recovery(clp); } void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags) { if (!flags) return; else if (flags & SEQ4_STATUS_RESTART_RECLAIM_NEEDED) nfs41_handle_server_reboot(clp); else 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); else if (flags & SEQ4_STATUS_RECALLABLE_STATE_REVOKED) nfs41_handle_recallable_state_revoked(clp); else if (flags & (SEQ4_STATUS_CB_PATH_DOWN | SEQ4_STATUS_BACKCHANNEL_FAULT | SEQ4_STATUS_CB_PATH_DOWN_SESSION)) nfs41_handle_cb_path_down(clp); } static int nfs4_reset_session(struct nfs_client *clp) { int status; nfs4_begin_drain_session(clp); status = nfs4_proc_destroy_session(clp->cl_session); if (status && status != -NFS4ERR_BADSESSION && status != -NFS4ERR_DEADSESSION) { 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); if (status) { status = nfs4_recovery_handle_error(clp, status); goto out; } /* create_session negotiated new slot table */ clear_bit(NFS4CLNT_RECALL_SLOT, &clp->cl_state); /* Let the state manager reestablish state */ if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) nfs41_setup_state_renewal(clp); out: return status; } static int nfs4_recall_slot(struct nfs_client *clp) { struct nfs4_slot_table *fc_tbl = &clp->cl_session->fc_slot_table; struct nfs4_channel_attrs *fc_attrs = &clp->cl_session->fc_attrs; struct nfs4_slot *new, *old; int i; nfs4_begin_drain_session(clp); new = kmalloc(fc_tbl->target_max_slots * sizeof(struct nfs4_slot), GFP_NOFS); if (!new) return -ENOMEM; spin_lock(&fc_tbl->slot_tbl_lock); for (i = 0; i < fc_tbl->target_max_slots; i++) new[i].seq_nr = fc_tbl->slots[i].seq_nr; old = fc_tbl->slots; fc_tbl->slots = new; fc_tbl->max_slots = fc_tbl->target_max_slots; fc_tbl->target_max_slots = 0; fc_attrs->max_reqs = fc_tbl->max_slots; spin_unlock(&fc_tbl->slot_tbl_lock); kfree(old); nfs4_end_drain_session(clp); return 0; } #else /* CONFIG_NFS_V4_1 */ static int nfs4_reset_session(struct nfs_client *clp) { return 0; } static int nfs4_end_drain_session(struct nfs_client *clp) { return 0; } static int nfs4_recall_slot(struct nfs_client *clp) { return 0; } #endif /* CONFIG_NFS_V4_1 */ /* Set NFS4CLNT_LEASE_EXPIRED for all v4.0 errors and for recoverable errors * on EXCHANGE_ID for v4.1 */ static void nfs4_set_lease_expired(struct nfs_client *clp, int status) { if (nfs4_has_session(clp)) { switch (status) { case -NFS4ERR_DELAY: case -NFS4ERR_CLID_INUSE: case -EAGAIN: break; case -EKEYEXPIRED: nfs4_warn_keyexpired(clp->cl_hostname); case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery * in nfs4_exchange_id */ default: return; } } set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); } static void nfs4_state_manager(struct nfs_client *clp) { int status = 0; /* Ensure exclusive access to NFSv4 state */ for(;;) { if (test_and_clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) { /* We're going to have to re-establish a clientid */ status = nfs4_reclaim_lease(clp); if (status) { nfs4_set_lease_expired(clp, status); if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) continue; if (clp->cl_cons_state == NFS_CS_SESSION_INITING) nfs_mark_client_ready(clp, status); goto out_error; } clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state); set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state); pnfs_destroy_all_layouts(clp); } if (test_and_clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state)) { status = nfs4_check_lease(clp); if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) continue; if (status < 0 && status != -NFS4ERR_CB_PATH_DOWN) goto out_error; } /* Initialize or reset the session */ if (test_and_clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state) && nfs4_has_session(clp)) { status = nfs4_reset_session(clp); if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) continue; if (status < 0) goto out_error; } /* First recover reboot state... */ if (test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) { 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)) { 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; } /* Recall session slots */ if (test_and_clear_bit(NFS4CLNT_RECALL_SLOT, &clp->cl_state) && nfs4_has_session(clp)) { status = nfs4_recall_slot(clp); if (status < 0) goto out_error; 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; } return; out_error: printk(KERN_WARNING "Error: state manager failed on NFSv4 server %s" " with error %d\n", clp->cl_hostname, -status); 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: */