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ba683031fa
We don't really need to clear &state->inode_states inside nfs4_set_mode_locked, and doing so without holding the inode->i_lock would in any case be a bug... Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
971 lines
25 KiB
C
971 lines
25 KiB
C
/*
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* fs/nfs/nfs4state.c
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*
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* Client-side XDR for NFSv4.
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*
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* Copyright (c) 2002 The Regents of the University of Michigan.
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* All rights reserved.
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*
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* Kendrick Smith <kmsmith@umich.edu>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
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* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* Implementation of the NFSv4 state model. For the time being,
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* this is minimal, but will be made much more complex in a
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* subsequent patch.
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*/
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/smp_lock.h>
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#include <linux/nfs_fs.h>
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#include <linux/nfs_idmap.h>
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#include <linux/kthread.h>
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#include <linux/module.h>
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#include <linux/random.h>
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#include <linux/workqueue.h>
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#include <linux/bitops.h>
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#include "nfs4_fs.h"
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#include "callback.h"
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#include "delegation.h"
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#include "internal.h"
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#define OPENOWNER_POOL_SIZE 8
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const nfs4_stateid zero_stateid;
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static LIST_HEAD(nfs4_clientid_list);
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static int nfs4_init_client(struct nfs_client *clp, struct rpc_cred *cred)
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{
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int status = nfs4_proc_setclientid(clp, NFS4_CALLBACK,
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nfs_callback_tcpport, cred);
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if (status == 0)
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status = nfs4_proc_setclientid_confirm(clp, cred);
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if (status == 0)
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nfs4_schedule_state_renewal(clp);
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return status;
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}
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struct rpc_cred *nfs4_get_renew_cred(struct nfs_client *clp)
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{
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struct nfs4_state_owner *sp;
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struct rb_node *pos;
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struct rpc_cred *cred = NULL;
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for (pos = rb_first(&clp->cl_state_owners); pos != NULL; pos = rb_next(pos)) {
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sp = rb_entry(pos, struct nfs4_state_owner, so_client_node);
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if (list_empty(&sp->so_states))
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continue;
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cred = get_rpccred(sp->so_cred);
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break;
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}
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return cred;
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}
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static struct rpc_cred *nfs4_get_setclientid_cred(struct nfs_client *clp)
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{
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struct nfs4_state_owner *sp;
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struct rb_node *pos;
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pos = rb_first(&clp->cl_state_owners);
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if (pos != NULL) {
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sp = rb_entry(pos, struct nfs4_state_owner, so_client_node);
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return get_rpccred(sp->so_cred);
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}
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return NULL;
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}
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static void nfs_alloc_unique_id(struct rb_root *root, struct nfs_unique_id *new,
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__u64 minval, int maxbits)
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{
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struct rb_node **p, *parent;
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struct nfs_unique_id *pos;
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__u64 mask = ~0ULL;
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if (maxbits < 64)
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mask = (1ULL << maxbits) - 1ULL;
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/* Ensure distribution is more or less flat */
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get_random_bytes(&new->id, sizeof(new->id));
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new->id &= mask;
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if (new->id < minval)
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new->id += minval;
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retry:
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p = &root->rb_node;
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parent = NULL;
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while (*p != NULL) {
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parent = *p;
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pos = rb_entry(parent, struct nfs_unique_id, rb_node);
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if (new->id < pos->id)
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p = &(*p)->rb_left;
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else if (new->id > pos->id)
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p = &(*p)->rb_right;
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else
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goto id_exists;
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}
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rb_link_node(&new->rb_node, parent, p);
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rb_insert_color(&new->rb_node, root);
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return;
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id_exists:
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for (;;) {
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new->id++;
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if (new->id < minval || (new->id & mask) != new->id) {
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new->id = minval;
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break;
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}
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parent = rb_next(parent);
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if (parent == NULL)
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break;
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pos = rb_entry(parent, struct nfs_unique_id, rb_node);
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if (new->id < pos->id)
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break;
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}
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goto retry;
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}
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static void nfs_free_unique_id(struct rb_root *root, struct nfs_unique_id *id)
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{
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rb_erase(&id->rb_node, root);
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}
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static struct nfs4_state_owner *
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nfs4_find_state_owner(struct nfs_server *server, struct rpc_cred *cred)
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{
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struct nfs_client *clp = server->nfs_client;
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struct rb_node **p = &clp->cl_state_owners.rb_node,
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*parent = NULL;
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struct nfs4_state_owner *sp, *res = NULL;
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while (*p != NULL) {
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parent = *p;
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sp = rb_entry(parent, struct nfs4_state_owner, so_client_node);
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if (server < sp->so_server) {
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p = &parent->rb_left;
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continue;
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}
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if (server > sp->so_server) {
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p = &parent->rb_right;
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continue;
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}
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if (cred < sp->so_cred)
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p = &parent->rb_left;
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else if (cred > sp->so_cred)
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p = &parent->rb_right;
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else {
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atomic_inc(&sp->so_count);
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res = sp;
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break;
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}
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}
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return res;
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}
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static struct nfs4_state_owner *
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nfs4_insert_state_owner(struct nfs_client *clp, struct nfs4_state_owner *new)
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{
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struct rb_node **p = &clp->cl_state_owners.rb_node,
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*parent = NULL;
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struct nfs4_state_owner *sp;
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while (*p != NULL) {
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parent = *p;
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sp = rb_entry(parent, struct nfs4_state_owner, so_client_node);
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if (new->so_server < sp->so_server) {
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p = &parent->rb_left;
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continue;
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}
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if (new->so_server > sp->so_server) {
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p = &parent->rb_right;
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continue;
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}
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if (new->so_cred < sp->so_cred)
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p = &parent->rb_left;
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else if (new->so_cred > sp->so_cred)
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p = &parent->rb_right;
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else {
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atomic_inc(&sp->so_count);
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return sp;
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}
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}
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nfs_alloc_unique_id(&clp->cl_openowner_id, &new->so_owner_id, 1, 64);
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rb_link_node(&new->so_client_node, parent, p);
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rb_insert_color(&new->so_client_node, &clp->cl_state_owners);
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return new;
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}
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static void
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nfs4_remove_state_owner(struct nfs_client *clp, struct nfs4_state_owner *sp)
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{
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if (!RB_EMPTY_NODE(&sp->so_client_node))
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rb_erase(&sp->so_client_node, &clp->cl_state_owners);
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nfs_free_unique_id(&clp->cl_openowner_id, &sp->so_owner_id);
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}
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/*
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* nfs4_alloc_state_owner(): this is called on the OPEN or CREATE path to
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* create a new state_owner.
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*
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*/
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static struct nfs4_state_owner *
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nfs4_alloc_state_owner(void)
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{
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struct nfs4_state_owner *sp;
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sp = kzalloc(sizeof(*sp),GFP_KERNEL);
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if (!sp)
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return NULL;
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spin_lock_init(&sp->so_lock);
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INIT_LIST_HEAD(&sp->so_states);
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INIT_LIST_HEAD(&sp->so_delegations);
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rpc_init_wait_queue(&sp->so_sequence.wait, "Seqid_waitqueue");
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sp->so_seqid.sequence = &sp->so_sequence;
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spin_lock_init(&sp->so_sequence.lock);
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INIT_LIST_HEAD(&sp->so_sequence.list);
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atomic_set(&sp->so_count, 1);
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return sp;
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}
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void
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nfs4_drop_state_owner(struct nfs4_state_owner *sp)
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{
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if (!RB_EMPTY_NODE(&sp->so_client_node)) {
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struct nfs_client *clp = sp->so_client;
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spin_lock(&clp->cl_lock);
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rb_erase(&sp->so_client_node, &clp->cl_state_owners);
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RB_CLEAR_NODE(&sp->so_client_node);
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spin_unlock(&clp->cl_lock);
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}
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}
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/*
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* Note: must be called with clp->cl_sem held in order to prevent races
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* with reboot recovery!
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*/
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struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *server, struct rpc_cred *cred)
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{
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struct nfs_client *clp = server->nfs_client;
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struct nfs4_state_owner *sp, *new;
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spin_lock(&clp->cl_lock);
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sp = nfs4_find_state_owner(server, cred);
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spin_unlock(&clp->cl_lock);
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if (sp != NULL)
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return sp;
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new = nfs4_alloc_state_owner();
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if (new == NULL)
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return NULL;
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new->so_client = clp;
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new->so_server = server;
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new->so_cred = cred;
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spin_lock(&clp->cl_lock);
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sp = nfs4_insert_state_owner(clp, new);
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spin_unlock(&clp->cl_lock);
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if (sp == new)
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get_rpccred(cred);
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else
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kfree(new);
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return sp;
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}
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/*
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* Must be called with clp->cl_sem held in order to avoid races
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* with state recovery...
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*/
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void nfs4_put_state_owner(struct nfs4_state_owner *sp)
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{
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struct nfs_client *clp = sp->so_client;
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struct rpc_cred *cred = sp->so_cred;
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if (!atomic_dec_and_lock(&sp->so_count, &clp->cl_lock))
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return;
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nfs4_remove_state_owner(clp, sp);
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spin_unlock(&clp->cl_lock);
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put_rpccred(cred);
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kfree(sp);
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}
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static struct nfs4_state *
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nfs4_alloc_open_state(void)
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{
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struct nfs4_state *state;
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state = kzalloc(sizeof(*state), GFP_KERNEL);
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if (!state)
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return NULL;
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atomic_set(&state->count, 1);
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INIT_LIST_HEAD(&state->lock_states);
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spin_lock_init(&state->state_lock);
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seqlock_init(&state->seqlock);
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return state;
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}
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void
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nfs4_state_set_mode_locked(struct nfs4_state *state, mode_t mode)
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{
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if (state->state == mode)
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return;
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/* NB! List reordering - see the reclaim code for why. */
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if ((mode & FMODE_WRITE) != (state->state & FMODE_WRITE)) {
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if (mode & FMODE_WRITE)
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list_move(&state->open_states, &state->owner->so_states);
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else
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list_move_tail(&state->open_states, &state->owner->so_states);
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}
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state->state = mode;
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}
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static struct nfs4_state *
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__nfs4_find_state_byowner(struct inode *inode, struct nfs4_state_owner *owner)
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{
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struct nfs_inode *nfsi = NFS_I(inode);
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struct nfs4_state *state;
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list_for_each_entry(state, &nfsi->open_states, inode_states) {
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if (state->owner != owner)
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continue;
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if (atomic_inc_not_zero(&state->count))
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return state;
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}
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return NULL;
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}
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static void
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nfs4_free_open_state(struct nfs4_state *state)
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{
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kfree(state);
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}
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struct nfs4_state *
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nfs4_get_open_state(struct inode *inode, struct nfs4_state_owner *owner)
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{
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struct nfs4_state *state, *new;
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struct nfs_inode *nfsi = NFS_I(inode);
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spin_lock(&inode->i_lock);
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state = __nfs4_find_state_byowner(inode, owner);
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spin_unlock(&inode->i_lock);
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if (state)
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goto out;
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new = nfs4_alloc_open_state();
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spin_lock(&owner->so_lock);
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spin_lock(&inode->i_lock);
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state = __nfs4_find_state_byowner(inode, owner);
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if (state == NULL && new != NULL) {
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state = new;
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state->owner = owner;
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atomic_inc(&owner->so_count);
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list_add(&state->inode_states, &nfsi->open_states);
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state->inode = igrab(inode);
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spin_unlock(&inode->i_lock);
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/* Note: The reclaim code dictates that we add stateless
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* and read-only stateids to the end of the list */
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list_add_tail(&state->open_states, &owner->so_states);
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spin_unlock(&owner->so_lock);
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} else {
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spin_unlock(&inode->i_lock);
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spin_unlock(&owner->so_lock);
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if (new)
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nfs4_free_open_state(new);
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}
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out:
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return state;
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}
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|
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/*
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* Beware! Caller must be holding exactly one
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* reference to clp->cl_sem!
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*/
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void nfs4_put_open_state(struct nfs4_state *state)
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{
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struct inode *inode = state->inode;
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struct nfs4_state_owner *owner = state->owner;
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if (!atomic_dec_and_lock(&state->count, &owner->so_lock))
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return;
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spin_lock(&inode->i_lock);
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list_del(&state->inode_states);
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list_del(&state->open_states);
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spin_unlock(&inode->i_lock);
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spin_unlock(&owner->so_lock);
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iput(inode);
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nfs4_free_open_state(state);
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nfs4_put_state_owner(owner);
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}
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|
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/*
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* Close the current file.
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*/
|
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void nfs4_close_state(struct path *path, struct nfs4_state *state, mode_t mode)
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{
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struct nfs4_state_owner *owner = state->owner;
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int call_close = 0;
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int newstate;
|
|
|
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atomic_inc(&owner->so_count);
|
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/* Protect against nfs4_find_state() */
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spin_lock(&owner->so_lock);
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switch (mode & (FMODE_READ | FMODE_WRITE)) {
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case FMODE_READ:
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state->n_rdonly--;
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break;
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case FMODE_WRITE:
|
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state->n_wronly--;
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break;
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case FMODE_READ|FMODE_WRITE:
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state->n_rdwr--;
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}
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newstate = FMODE_READ|FMODE_WRITE;
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if (state->n_rdwr == 0) {
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if (state->n_rdonly == 0) {
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newstate &= ~FMODE_READ;
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call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
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call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
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}
|
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if (state->n_wronly == 0) {
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|
newstate &= ~FMODE_WRITE;
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call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
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call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
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}
|
|
if (newstate == 0)
|
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clear_bit(NFS_DELEGATED_STATE, &state->flags);
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}
|
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nfs4_state_set_mode_locked(state, newstate);
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spin_unlock(&owner->so_lock);
|
|
|
|
if (!call_close) {
|
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nfs4_put_open_state(state);
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nfs4_put_state_owner(owner);
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} else
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nfs4_do_close(path, state);
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}
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|
|
|
/*
|
|
* Search the state->lock_states for an existing lock_owner
|
|
* that is compatible with current->files
|
|
*/
|
|
static struct nfs4_lock_state *
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|
__nfs4_find_lock_state(struct nfs4_state *state, fl_owner_t fl_owner)
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|
{
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|
struct nfs4_lock_state *pos;
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list_for_each_entry(pos, &state->lock_states, ls_locks) {
|
|
if (pos->ls_owner != fl_owner)
|
|
continue;
|
|
atomic_inc(&pos->ls_count);
|
|
return pos;
|
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}
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* Return a compatible lock_state. If no initialized lock_state structure
|
|
* exists, return an uninitialized one.
|
|
*
|
|
*/
|
|
static struct nfs4_lock_state *nfs4_alloc_lock_state(struct nfs4_state *state, fl_owner_t fl_owner)
|
|
{
|
|
struct nfs4_lock_state *lsp;
|
|
struct nfs_client *clp = state->owner->so_client;
|
|
|
|
lsp = kzalloc(sizeof(*lsp), GFP_KERNEL);
|
|
if (lsp == NULL)
|
|
return NULL;
|
|
lsp->ls_seqid.sequence = &state->owner->so_sequence;
|
|
atomic_set(&lsp->ls_count, 1);
|
|
lsp->ls_owner = fl_owner;
|
|
spin_lock(&clp->cl_lock);
|
|
nfs_alloc_unique_id(&clp->cl_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_client *clp = lsp->ls_state->owner->so_client;
|
|
|
|
spin_lock(&clp->cl_lock);
|
|
nfs_free_unique_id(&clp->cl_lockowner_id, &lsp->ls_id);
|
|
spin_unlock(&clp->cl_lock);
|
|
kfree(lsp);
|
|
}
|
|
|
|
/*
|
|
* Return a compatible lock_state. If no initialized lock_state structure
|
|
* exists, return an uninitialized one.
|
|
*
|
|
* The caller must be holding clp->cl_sem
|
|
*/
|
|
static struct nfs4_lock_state *nfs4_get_lock_state(struct nfs4_state *state, fl_owner_t owner)
|
|
{
|
|
struct nfs4_lock_state *lsp, *new = NULL;
|
|
|
|
for(;;) {
|
|
spin_lock(&state->state_lock);
|
|
lsp = __nfs4_find_lock_state(state, owner);
|
|
if (lsp != NULL)
|
|
break;
|
|
if (new != NULL) {
|
|
new->ls_state = state;
|
|
list_add(&new->ls_locks, &state->lock_states);
|
|
set_bit(LK_STATE_IN_USE, &state->flags);
|
|
lsp = new;
|
|
new = NULL;
|
|
break;
|
|
}
|
|
spin_unlock(&state->state_lock);
|
|
new = nfs4_alloc_lock_state(state, owner);
|
|
if (new == NULL)
|
|
return NULL;
|
|
}
|
|
spin_unlock(&state->state_lock);
|
|
if (new != NULL)
|
|
nfs4_free_lock_state(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);
|
|
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 struct file_lock_operations nfs4_fl_lock_ops = {
|
|
.fl_copy_lock = nfs4_fl_copy_lock,
|
|
.fl_release_private = nfs4_fl_release_lock,
|
|
};
|
|
|
|
int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl)
|
|
{
|
|
struct nfs4_lock_state *lsp;
|
|
|
|
if (fl->fl_ops != NULL)
|
|
return 0;
|
|
lsp = nfs4_get_lock_state(state, fl->fl_owner);
|
|
if (lsp == NULL)
|
|
return -ENOMEM;
|
|
fl->fl_u.nfs4_fl.owner = lsp;
|
|
fl->fl_ops = &nfs4_fl_lock_ops;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* 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)
|
|
{
|
|
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);
|
|
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)
|
|
{
|
|
struct rpc_sequence *sequence = counter->sequence;
|
|
struct nfs_seqid *new;
|
|
|
|
new = kmalloc(sizeof(*new), GFP_KERNEL);
|
|
if (new != NULL) {
|
|
new->sequence = counter;
|
|
spin_lock(&sequence->lock);
|
|
list_add_tail(&new->list, &sequence->list);
|
|
spin_unlock(&sequence->lock);
|
|
}
|
|
return new;
|
|
}
|
|
|
|
void nfs_free_seqid(struct nfs_seqid *seqid)
|
|
{
|
|
struct rpc_sequence *sequence = seqid->sequence->sequence;
|
|
|
|
spin_lock(&sequence->lock);
|
|
list_del(&seqid->list);
|
|
spin_unlock(&sequence->lock);
|
|
rpc_wake_up(&sequence->wait);
|
|
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;
|
|
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)
|
|
{
|
|
if (status == -NFS4ERR_BAD_SEQID) {
|
|
struct nfs4_state_owner *sp = container_of(seqid->sequence,
|
|
struct nfs4_state_owner, so_seqid);
|
|
nfs4_drop_state_owner(sp);
|
|
}
|
|
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;
|
|
|
|
if (sequence->list.next == &seqid->list)
|
|
goto out;
|
|
spin_lock(&sequence->lock);
|
|
if (sequence->list.next != &seqid->list) {
|
|
rpc_sleep_on(&sequence->wait, task, NULL, NULL);
|
|
status = -EAGAIN;
|
|
}
|
|
spin_unlock(&sequence->lock);
|
|
out:
|
|
return status;
|
|
}
|
|
|
|
static int reclaimer(void *);
|
|
|
|
static inline void nfs4_clear_recover_bit(struct nfs_client *clp)
|
|
{
|
|
smp_mb__before_clear_bit();
|
|
clear_bit(NFS4CLNT_STATE_RECOVER, &clp->cl_state);
|
|
smp_mb__after_clear_bit();
|
|
wake_up_bit(&clp->cl_state, NFS4CLNT_STATE_RECOVER);
|
|
rpc_wake_up(&clp->cl_rpcwaitq);
|
|
}
|
|
|
|
/*
|
|
* State recovery routine
|
|
*/
|
|
static void nfs4_recover_state(struct nfs_client *clp)
|
|
{
|
|
struct task_struct *task;
|
|
|
|
__module_get(THIS_MODULE);
|
|
atomic_inc(&clp->cl_count);
|
|
task = kthread_run(reclaimer, clp, "%u.%u.%u.%u-reclaim",
|
|
NIPQUAD(clp->cl_addr.sin_addr));
|
|
if (!IS_ERR(task))
|
|
return;
|
|
nfs4_clear_recover_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_and_set_bit(NFS4CLNT_STATE_RECOVER, &clp->cl_state) == 0)
|
|
nfs4_recover_state(clp);
|
|
}
|
|
|
|
static int nfs4_reclaim_locks(struct nfs4_state_recovery_ops *ops, struct nfs4_state *state)
|
|
{
|
|
struct inode *inode = state->inode;
|
|
struct file_lock *fl;
|
|
int status = 0;
|
|
|
|
for (fl = inode->i_flock; fl != 0; fl = fl->fl_next) {
|
|
if (!(fl->fl_flags & (FL_POSIX|FL_FLOCK)))
|
|
continue;
|
|
if (((struct nfs_open_context *)fl->fl_file->private_data)->state != state)
|
|
continue;
|
|
status = ops->recover_lock(state, fl);
|
|
if (status >= 0)
|
|
continue;
|
|
switch (status) {
|
|
default:
|
|
printk(KERN_ERR "%s: unhandled error %d. Zeroing state\n",
|
|
__FUNCTION__, status);
|
|
case -NFS4ERR_EXPIRED:
|
|
case -NFS4ERR_NO_GRACE:
|
|
case -NFS4ERR_RECLAIM_BAD:
|
|
case -NFS4ERR_RECLAIM_CONFLICT:
|
|
/* kill_proc(fl->fl_pid, SIGLOST, 1); */
|
|
break;
|
|
case -NFS4ERR_STALE_CLIENTID:
|
|
goto out_err;
|
|
}
|
|
}
|
|
return 0;
|
|
out_err:
|
|
return status;
|
|
}
|
|
|
|
static int nfs4_reclaim_open_state(struct nfs4_state_recovery_ops *ops, struct nfs4_state_owner *sp)
|
|
{
|
|
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.
|
|
*/
|
|
list_for_each_entry(state, &sp->so_states, open_states) {
|
|
if (state->state == 0)
|
|
continue;
|
|
status = ops->recover_open(sp, state);
|
|
if (status >= 0) {
|
|
status = nfs4_reclaim_locks(ops, state);
|
|
if (status < 0)
|
|
goto out_err;
|
|
list_for_each_entry(lock, &state->lock_states, ls_locks) {
|
|
if (!(lock->ls_flags & NFS_LOCK_INITIALIZED))
|
|
printk("%s: Lock reclaim failed!\n",
|
|
__FUNCTION__);
|
|
}
|
|
continue;
|
|
}
|
|
switch (status) {
|
|
default:
|
|
printk(KERN_ERR "%s: unhandled error %d. Zeroing state\n",
|
|
__FUNCTION__, status);
|
|
case -ENOENT:
|
|
case -NFS4ERR_RECLAIM_BAD:
|
|
case -NFS4ERR_RECLAIM_CONFLICT:
|
|
/*
|
|
* 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 -NFS4ERR_EXPIRED:
|
|
case -NFS4ERR_NO_GRACE:
|
|
case -NFS4ERR_STALE_CLIENTID:
|
|
goto out_err;
|
|
}
|
|
}
|
|
return 0;
|
|
out_err:
|
|
return status;
|
|
}
|
|
|
|
static void nfs4_state_mark_reclaim(struct nfs_client *clp)
|
|
{
|
|
struct nfs4_state_owner *sp;
|
|
struct rb_node *pos;
|
|
struct nfs4_state *state;
|
|
struct nfs4_lock_state *lock;
|
|
|
|
/* Reset all sequence ids to zero */
|
|
for (pos = rb_first(&clp->cl_state_owners); pos != NULL; pos = rb_next(pos)) {
|
|
sp = rb_entry(pos, struct nfs4_state_owner, so_client_node);
|
|
sp->so_seqid.counter = 0;
|
|
sp->so_seqid.flags = 0;
|
|
spin_lock(&sp->so_lock);
|
|
list_for_each_entry(state, &sp->so_states, open_states) {
|
|
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.counter = 0;
|
|
lock->ls_seqid.flags = 0;
|
|
lock->ls_flags &= ~NFS_LOCK_INITIALIZED;
|
|
}
|
|
}
|
|
spin_unlock(&sp->so_lock);
|
|
}
|
|
}
|
|
|
|
static int reclaimer(void *ptr)
|
|
{
|
|
struct nfs_client *clp = ptr;
|
|
struct nfs4_state_owner *sp;
|
|
struct rb_node *pos;
|
|
struct nfs4_state_recovery_ops *ops;
|
|
struct rpc_cred *cred;
|
|
int status = 0;
|
|
|
|
allow_signal(SIGKILL);
|
|
|
|
/* Ensure exclusive access to NFSv4 state */
|
|
lock_kernel();
|
|
down_write(&clp->cl_sem);
|
|
/* Are there any NFS mounts out there? */
|
|
if (list_empty(&clp->cl_superblocks))
|
|
goto out;
|
|
restart_loop:
|
|
ops = &nfs4_network_partition_recovery_ops;
|
|
/* Are there any open files on this volume? */
|
|
cred = nfs4_get_renew_cred(clp);
|
|
if (cred != NULL) {
|
|
/* Yes there are: try to renew the old lease */
|
|
status = nfs4_proc_renew(clp, cred);
|
|
switch (status) {
|
|
case 0:
|
|
case -NFS4ERR_CB_PATH_DOWN:
|
|
put_rpccred(cred);
|
|
goto out;
|
|
case -NFS4ERR_STALE_CLIENTID:
|
|
case -NFS4ERR_LEASE_MOVED:
|
|
ops = &nfs4_reboot_recovery_ops;
|
|
}
|
|
} else {
|
|
/* "reboot" to ensure we clear all state on the server */
|
|
clp->cl_boot_time = CURRENT_TIME;
|
|
cred = nfs4_get_setclientid_cred(clp);
|
|
}
|
|
/* We're going to have to re-establish a clientid */
|
|
nfs4_state_mark_reclaim(clp);
|
|
status = -ENOENT;
|
|
if (cred != NULL) {
|
|
status = nfs4_init_client(clp, cred);
|
|
put_rpccred(cred);
|
|
}
|
|
if (status)
|
|
goto out_error;
|
|
/* Mark all delegations for reclaim */
|
|
nfs_delegation_mark_reclaim(clp);
|
|
/* Note: list is protected by exclusive lock on cl->cl_sem */
|
|
for (pos = rb_first(&clp->cl_state_owners); pos != NULL; pos = rb_next(pos)) {
|
|
sp = rb_entry(pos, struct nfs4_state_owner, so_client_node);
|
|
status = nfs4_reclaim_open_state(ops, sp);
|
|
if (status < 0) {
|
|
if (status == -NFS4ERR_NO_GRACE) {
|
|
ops = &nfs4_network_partition_recovery_ops;
|
|
status = nfs4_reclaim_open_state(ops, sp);
|
|
}
|
|
if (status == -NFS4ERR_STALE_CLIENTID)
|
|
goto restart_loop;
|
|
if (status == -NFS4ERR_EXPIRED)
|
|
goto restart_loop;
|
|
}
|
|
}
|
|
nfs_delegation_reap_unclaimed(clp);
|
|
out:
|
|
up_write(&clp->cl_sem);
|
|
unlock_kernel();
|
|
if (status == -NFS4ERR_CB_PATH_DOWN)
|
|
nfs_handle_cb_pathdown(clp);
|
|
nfs4_clear_recover_bit(clp);
|
|
nfs_put_client(clp);
|
|
module_put_and_exit(0);
|
|
return 0;
|
|
out_error:
|
|
printk(KERN_WARNING "Error: state recovery failed on NFSv4 server %u.%u.%u.%u with error %d\n",
|
|
NIPQUAD(clp->cl_addr.sin_addr), -status);
|
|
set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* Local variables:
|
|
* c-basic-offset: 8
|
|
* End:
|
|
*/
|