6db4831e98
Android 14
693 lines
16 KiB
C
693 lines
16 KiB
C
/* AFS server record management
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*
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* Copyright (C) 2002, 2007 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/sched.h>
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#include <linux/slab.h>
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#include "afs_fs.h"
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#include "internal.h"
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static unsigned afs_server_gc_delay = 10; /* Server record timeout in seconds */
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static unsigned afs_server_update_delay = 30; /* Time till VLDB recheck in secs */
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static void afs_inc_servers_outstanding(struct afs_net *net)
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{
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atomic_inc(&net->servers_outstanding);
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}
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static void afs_dec_servers_outstanding(struct afs_net *net)
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{
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if (atomic_dec_and_test(&net->servers_outstanding))
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wake_up_var(&net->servers_outstanding);
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}
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/*
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* Find a server by one of its addresses.
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*/
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struct afs_server *afs_find_server(struct afs_net *net,
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const struct sockaddr_rxrpc *srx)
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{
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const struct afs_addr_list *alist;
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struct afs_server *server = NULL;
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unsigned int i;
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int seq = 0, diff;
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rcu_read_lock();
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do {
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if (server)
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afs_put_server(net, server);
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server = NULL;
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read_seqbegin_or_lock(&net->fs_addr_lock, &seq);
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if (srx->transport.family == AF_INET6) {
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const struct sockaddr_in6 *a = &srx->transport.sin6, *b;
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hlist_for_each_entry_rcu(server, &net->fs_addresses6, addr6_link) {
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alist = rcu_dereference(server->addresses);
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for (i = alist->nr_ipv4; i < alist->nr_addrs; i++) {
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b = &alist->addrs[i].transport.sin6;
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diff = ((u16 __force)a->sin6_port -
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(u16 __force)b->sin6_port);
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if (diff == 0)
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diff = memcmp(&a->sin6_addr,
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&b->sin6_addr,
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sizeof(struct in6_addr));
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if (diff == 0)
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goto found;
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}
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}
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} else {
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const struct sockaddr_in *a = &srx->transport.sin, *b;
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hlist_for_each_entry_rcu(server, &net->fs_addresses4, addr4_link) {
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alist = rcu_dereference(server->addresses);
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for (i = 0; i < alist->nr_ipv4; i++) {
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b = &alist->addrs[i].transport.sin;
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diff = ((u16 __force)a->sin_port -
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(u16 __force)b->sin_port);
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if (diff == 0)
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diff = ((u32 __force)a->sin_addr.s_addr -
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(u32 __force)b->sin_addr.s_addr);
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if (diff == 0)
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goto found;
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}
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}
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}
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server = NULL;
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found:
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if (server && !atomic_inc_not_zero(&server->usage))
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server = NULL;
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} while (need_seqretry(&net->fs_addr_lock, seq));
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done_seqretry(&net->fs_addr_lock, seq);
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rcu_read_unlock();
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return server;
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}
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/*
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* Look up a server by its UUID
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*/
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struct afs_server *afs_find_server_by_uuid(struct afs_net *net, const uuid_t *uuid)
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{
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struct afs_server *server = NULL;
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struct rb_node *p;
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int diff, seq = 0;
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_enter("%pU", uuid);
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do {
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/* Unfortunately, rbtree walking doesn't give reliable results
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* under just the RCU read lock, so we have to check for
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* changes.
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*/
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if (server)
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afs_put_server(net, server);
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server = NULL;
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read_seqbegin_or_lock(&net->fs_lock, &seq);
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p = net->fs_servers.rb_node;
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while (p) {
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server = rb_entry(p, struct afs_server, uuid_rb);
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diff = memcmp(uuid, &server->uuid, sizeof(*uuid));
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if (diff < 0) {
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p = p->rb_left;
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} else if (diff > 0) {
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p = p->rb_right;
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} else {
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afs_get_server(server);
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break;
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}
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server = NULL;
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}
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} while (need_seqretry(&net->fs_lock, seq));
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done_seqretry(&net->fs_lock, seq);
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_leave(" = %p", server);
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return server;
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}
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/*
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* Install a server record in the namespace tree
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*/
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static struct afs_server *afs_install_server(struct afs_net *net,
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struct afs_server *candidate)
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{
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const struct afs_addr_list *alist;
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struct afs_server *server;
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struct rb_node **pp, *p;
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int ret = -EEXIST, diff;
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_enter("%p", candidate);
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write_seqlock(&net->fs_lock);
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/* Firstly install the server in the UUID lookup tree */
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pp = &net->fs_servers.rb_node;
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p = NULL;
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while (*pp) {
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p = *pp;
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_debug("- consider %p", p);
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server = rb_entry(p, struct afs_server, uuid_rb);
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diff = memcmp(&candidate->uuid, &server->uuid, sizeof(uuid_t));
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if (diff < 0)
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pp = &(*pp)->rb_left;
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else if (diff > 0)
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pp = &(*pp)->rb_right;
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else
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goto exists;
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}
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server = candidate;
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rb_link_node(&server->uuid_rb, p, pp);
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rb_insert_color(&server->uuid_rb, &net->fs_servers);
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hlist_add_head_rcu(&server->proc_link, &net->fs_proc);
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write_seqlock(&net->fs_addr_lock);
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alist = rcu_dereference_protected(server->addresses,
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lockdep_is_held(&net->fs_addr_lock.lock));
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/* Secondly, if the server has any IPv4 and/or IPv6 addresses, install
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* it in the IPv4 and/or IPv6 reverse-map lists.
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*
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* TODO: For speed we want to use something other than a flat list
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* here; even sorting the list in terms of lowest address would help a
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* bit, but anything we might want to do gets messy and memory
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* intensive.
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*/
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if (alist->nr_ipv4 > 0)
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hlist_add_head_rcu(&server->addr4_link, &net->fs_addresses4);
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if (alist->nr_addrs > alist->nr_ipv4)
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hlist_add_head_rcu(&server->addr6_link, &net->fs_addresses6);
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write_sequnlock(&net->fs_addr_lock);
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ret = 0;
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exists:
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afs_get_server(server);
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write_sequnlock(&net->fs_lock);
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return server;
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}
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/*
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* allocate a new server record
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*/
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static struct afs_server *afs_alloc_server(struct afs_net *net,
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const uuid_t *uuid,
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struct afs_addr_list *alist)
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{
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struct afs_server *server;
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_enter("");
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server = kzalloc(sizeof(struct afs_server), GFP_KERNEL);
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if (!server)
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goto enomem;
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atomic_set(&server->usage, 1);
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RCU_INIT_POINTER(server->addresses, alist);
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server->addr_version = alist->version;
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server->uuid = *uuid;
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server->flags = (1UL << AFS_SERVER_FL_NEW);
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server->update_at = ktime_get_real_seconds() + afs_server_update_delay;
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rwlock_init(&server->fs_lock);
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INIT_HLIST_HEAD(&server->cb_volumes);
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rwlock_init(&server->cb_break_lock);
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afs_inc_servers_outstanding(net);
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_leave(" = %p", server);
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return server;
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enomem:
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_leave(" = NULL [nomem]");
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return NULL;
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}
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/*
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* Look up an address record for a server
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*/
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static struct afs_addr_list *afs_vl_lookup_addrs(struct afs_cell *cell,
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struct key *key, const uuid_t *uuid)
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{
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struct afs_addr_cursor ac;
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struct afs_addr_list *alist;
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int ret;
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ret = afs_set_vl_cursor(&ac, cell);
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if (ret < 0)
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return ERR_PTR(ret);
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while (afs_iterate_addresses(&ac)) {
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if (test_bit(ac.index, &ac.alist->yfs))
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alist = afs_yfsvl_get_endpoints(cell->net, &ac, key, uuid);
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else
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alist = afs_vl_get_addrs_u(cell->net, &ac, key, uuid);
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switch (ac.error) {
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case 0:
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afs_end_cursor(&ac);
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return alist;
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case -ECONNABORTED:
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ac.error = afs_abort_to_error(ac.abort_code);
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goto error;
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case -ENOMEM:
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case -ENONET:
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goto error;
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case -ENETUNREACH:
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case -EHOSTUNREACH:
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case -ECONNREFUSED:
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break;
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default:
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ac.error = -EIO;
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goto error;
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}
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}
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error:
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return ERR_PTR(afs_end_cursor(&ac));
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}
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/*
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* Get or create a fileserver record.
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*/
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struct afs_server *afs_lookup_server(struct afs_cell *cell, struct key *key,
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const uuid_t *uuid)
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{
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struct afs_addr_list *alist;
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struct afs_server *server, *candidate;
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_enter("%p,%pU", cell->net, uuid);
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server = afs_find_server_by_uuid(cell->net, uuid);
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if (server)
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return server;
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alist = afs_vl_lookup_addrs(cell, key, uuid);
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if (IS_ERR(alist))
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return ERR_CAST(alist);
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candidate = afs_alloc_server(cell->net, uuid, alist);
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if (!candidate) {
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afs_put_addrlist(alist);
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return ERR_PTR(-ENOMEM);
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}
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server = afs_install_server(cell->net, candidate);
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if (server != candidate) {
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afs_put_addrlist(alist);
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kfree(candidate);
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}
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_leave(" = %p{%d}", server, atomic_read(&server->usage));
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return server;
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}
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/*
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* Set the server timer to fire after a given delay, assuming it's not already
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* set for an earlier time.
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*/
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static void afs_set_server_timer(struct afs_net *net, time64_t delay)
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{
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if (net->live) {
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afs_inc_servers_outstanding(net);
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if (timer_reduce(&net->fs_timer, jiffies + delay * HZ))
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afs_dec_servers_outstanding(net);
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}
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}
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/*
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* Server management timer. We have an increment on fs_outstanding that we
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* need to pass along to the work item.
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*/
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void afs_servers_timer(struct timer_list *timer)
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{
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struct afs_net *net = container_of(timer, struct afs_net, fs_timer);
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_enter("");
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if (!queue_work(afs_wq, &net->fs_manager))
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afs_dec_servers_outstanding(net);
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}
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/*
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* Release a reference on a server record.
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*/
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void afs_put_server(struct afs_net *net, struct afs_server *server)
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{
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unsigned int usage;
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if (!server)
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return;
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server->put_time = ktime_get_real_seconds();
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usage = atomic_dec_return(&server->usage);
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_enter("{%u}", usage);
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if (likely(usage > 0))
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return;
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afs_set_server_timer(net, afs_server_gc_delay);
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}
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static void afs_server_rcu(struct rcu_head *rcu)
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{
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struct afs_server *server = container_of(rcu, struct afs_server, rcu);
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afs_put_addrlist(rcu_access_pointer(server->addresses));
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kfree(server);
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}
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/*
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* destroy a dead server
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*/
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static void afs_destroy_server(struct afs_net *net, struct afs_server *server)
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{
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struct afs_addr_list *alist = rcu_access_pointer(server->addresses);
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struct afs_addr_cursor ac = {
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.alist = alist,
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.start = alist->index,
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.index = 0,
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.addr = &alist->addrs[alist->index],
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.error = 0,
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};
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_enter("%p", server);
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if (test_bit(AFS_SERVER_FL_MAY_HAVE_CB, &server->flags))
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afs_fs_give_up_all_callbacks(net, server, &ac, NULL);
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call_rcu(&server->rcu, afs_server_rcu);
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afs_dec_servers_outstanding(net);
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}
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/*
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* Garbage collect any expired servers.
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*/
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static void afs_gc_servers(struct afs_net *net, struct afs_server *gc_list)
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{
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struct afs_server *server;
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bool deleted;
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int usage;
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while ((server = gc_list)) {
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gc_list = server->gc_next;
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write_seqlock(&net->fs_lock);
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usage = 1;
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deleted = atomic_try_cmpxchg(&server->usage, &usage, 0);
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if (deleted) {
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rb_erase(&server->uuid_rb, &net->fs_servers);
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hlist_del_rcu(&server->proc_link);
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}
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write_sequnlock(&net->fs_lock);
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if (deleted) {
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write_seqlock(&net->fs_addr_lock);
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if (!hlist_unhashed(&server->addr4_link))
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hlist_del_rcu(&server->addr4_link);
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if (!hlist_unhashed(&server->addr6_link))
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hlist_del_rcu(&server->addr6_link);
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write_sequnlock(&net->fs_addr_lock);
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afs_destroy_server(net, server);
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}
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}
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}
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/*
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* Manage the records of servers known to be within a network namespace. This
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* includes garbage collecting unused servers.
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*
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* Note also that we were given an increment on net->servers_outstanding by
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* whoever queued us that we need to deal with before returning.
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*/
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void afs_manage_servers(struct work_struct *work)
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{
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struct afs_net *net = container_of(work, struct afs_net, fs_manager);
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struct afs_server *gc_list = NULL;
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struct rb_node *cursor;
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time64_t now = ktime_get_real_seconds(), next_manage = TIME64_MAX;
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bool purging = !net->live;
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_enter("");
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/* Trawl the server list looking for servers that have expired from
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* lack of use.
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*/
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read_seqlock_excl(&net->fs_lock);
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for (cursor = rb_first(&net->fs_servers); cursor; cursor = rb_next(cursor)) {
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struct afs_server *server =
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rb_entry(cursor, struct afs_server, uuid_rb);
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int usage = atomic_read(&server->usage);
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_debug("manage %pU %u", &server->uuid, usage);
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ASSERTCMP(usage, >=, 1);
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ASSERTIFCMP(purging, usage, ==, 1);
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if (usage == 1) {
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time64_t expire_at = server->put_time;
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if (!test_bit(AFS_SERVER_FL_VL_FAIL, &server->flags) &&
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!test_bit(AFS_SERVER_FL_NOT_FOUND, &server->flags))
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expire_at += afs_server_gc_delay;
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if (purging || expire_at <= now) {
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server->gc_next = gc_list;
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gc_list = server;
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} else if (expire_at < next_manage) {
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next_manage = expire_at;
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}
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}
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}
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read_sequnlock_excl(&net->fs_lock);
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/* Update the timer on the way out. We have to pass an increment on
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* servers_outstanding in the namespace that we are in to the timer or
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* the work scheduler.
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*/
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if (!purging && next_manage < TIME64_MAX) {
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now = ktime_get_real_seconds();
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if (next_manage - now <= 0) {
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if (queue_work(afs_wq, &net->fs_manager))
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afs_inc_servers_outstanding(net);
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} else {
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afs_set_server_timer(net, next_manage - now);
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}
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}
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afs_gc_servers(net, gc_list);
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afs_dec_servers_outstanding(net);
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_leave(" [%d]", atomic_read(&net->servers_outstanding));
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}
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static void afs_queue_server_manager(struct afs_net *net)
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{
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afs_inc_servers_outstanding(net);
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if (!queue_work(afs_wq, &net->fs_manager))
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afs_dec_servers_outstanding(net);
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}
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/*
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* Purge list of servers.
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*/
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void afs_purge_servers(struct afs_net *net)
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{
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_enter("");
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if (del_timer_sync(&net->fs_timer))
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atomic_dec(&net->servers_outstanding);
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afs_queue_server_manager(net);
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_debug("wait");
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wait_var_event(&net->servers_outstanding,
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!atomic_read(&net->servers_outstanding));
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_leave("");
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}
|
|
|
|
/*
|
|
* Probe a fileserver to find its capabilities.
|
|
*
|
|
* TODO: Try service upgrade.
|
|
*/
|
|
static bool afs_do_probe_fileserver(struct afs_fs_cursor *fc)
|
|
{
|
|
_enter("");
|
|
|
|
fc->ac.addr = NULL;
|
|
fc->ac.start = READ_ONCE(fc->ac.alist->index);
|
|
fc->ac.index = fc->ac.start;
|
|
fc->ac.error = 0;
|
|
fc->ac.begun = false;
|
|
|
|
while (afs_iterate_addresses(&fc->ac)) {
|
|
afs_fs_get_capabilities(afs_v2net(fc->vnode), fc->cbi->server,
|
|
&fc->ac, fc->key);
|
|
switch (fc->ac.error) {
|
|
case 0:
|
|
afs_end_cursor(&fc->ac);
|
|
set_bit(AFS_SERVER_FL_PROBED, &fc->cbi->server->flags);
|
|
return true;
|
|
case -ECONNABORTED:
|
|
fc->ac.error = afs_abort_to_error(fc->ac.abort_code);
|
|
goto error;
|
|
case -ENOMEM:
|
|
case -ENONET:
|
|
goto error;
|
|
case -ENETUNREACH:
|
|
case -EHOSTUNREACH:
|
|
case -ECONNREFUSED:
|
|
case -ETIMEDOUT:
|
|
case -ETIME:
|
|
break;
|
|
default:
|
|
fc->ac.error = -EIO;
|
|
goto error;
|
|
}
|
|
}
|
|
|
|
error:
|
|
afs_end_cursor(&fc->ac);
|
|
return false;
|
|
}
|
|
|
|
/*
|
|
* If we haven't already, try probing the fileserver to get its capabilities.
|
|
* We try not to instigate parallel probes, but it's possible that the parallel
|
|
* probes will fail due to authentication failure when ours would succeed.
|
|
*
|
|
* TODO: Try sending an anonymous probe if an authenticated probe fails.
|
|
*/
|
|
bool afs_probe_fileserver(struct afs_fs_cursor *fc)
|
|
{
|
|
bool success;
|
|
int ret, retries = 0;
|
|
|
|
_enter("");
|
|
|
|
retry:
|
|
if (test_bit(AFS_SERVER_FL_PROBED, &fc->cbi->server->flags)) {
|
|
_leave(" = t");
|
|
return true;
|
|
}
|
|
|
|
if (!test_and_set_bit_lock(AFS_SERVER_FL_PROBING, &fc->cbi->server->flags)) {
|
|
success = afs_do_probe_fileserver(fc);
|
|
clear_bit_unlock(AFS_SERVER_FL_PROBING, &fc->cbi->server->flags);
|
|
wake_up_bit(&fc->cbi->server->flags, AFS_SERVER_FL_PROBING);
|
|
_leave(" = t");
|
|
return success;
|
|
}
|
|
|
|
_debug("wait");
|
|
ret = wait_on_bit(&fc->cbi->server->flags, AFS_SERVER_FL_PROBING,
|
|
TASK_INTERRUPTIBLE);
|
|
if (ret == -ERESTARTSYS) {
|
|
fc->ac.error = ret;
|
|
_leave(" = f [%d]", ret);
|
|
return false;
|
|
}
|
|
|
|
retries++;
|
|
if (retries == 4) {
|
|
fc->ac.error = -ESTALE;
|
|
_leave(" = f [stale]");
|
|
return false;
|
|
}
|
|
_debug("retry");
|
|
goto retry;
|
|
}
|
|
|
|
/*
|
|
* Get an update for a server's address list.
|
|
*/
|
|
static noinline bool afs_update_server_record(struct afs_fs_cursor *fc, struct afs_server *server)
|
|
{
|
|
struct afs_addr_list *alist, *discard;
|
|
|
|
_enter("");
|
|
|
|
alist = afs_vl_lookup_addrs(fc->vnode->volume->cell, fc->key,
|
|
&server->uuid);
|
|
if (IS_ERR(alist)) {
|
|
fc->ac.error = PTR_ERR(alist);
|
|
_leave(" = f [%d]", fc->ac.error);
|
|
return false;
|
|
}
|
|
|
|
discard = alist;
|
|
if (server->addr_version != alist->version) {
|
|
write_lock(&server->fs_lock);
|
|
discard = rcu_dereference_protected(server->addresses,
|
|
lockdep_is_held(&server->fs_lock));
|
|
rcu_assign_pointer(server->addresses, alist);
|
|
server->addr_version = alist->version;
|
|
write_unlock(&server->fs_lock);
|
|
}
|
|
|
|
server->update_at = ktime_get_real_seconds() + afs_server_update_delay;
|
|
afs_put_addrlist(discard);
|
|
_leave(" = t");
|
|
return true;
|
|
}
|
|
|
|
/*
|
|
* See if a server's address list needs updating.
|
|
*/
|
|
bool afs_check_server_record(struct afs_fs_cursor *fc, struct afs_server *server)
|
|
{
|
|
time64_t now = ktime_get_real_seconds();
|
|
long diff;
|
|
bool success;
|
|
int ret, retries = 0;
|
|
|
|
_enter("");
|
|
|
|
ASSERT(server);
|
|
|
|
retry:
|
|
diff = READ_ONCE(server->update_at) - now;
|
|
if (diff > 0) {
|
|
_leave(" = t [not now %ld]", diff);
|
|
return true;
|
|
}
|
|
|
|
if (!test_and_set_bit_lock(AFS_SERVER_FL_UPDATING, &server->flags)) {
|
|
success = afs_update_server_record(fc, server);
|
|
clear_bit_unlock(AFS_SERVER_FL_UPDATING, &server->flags);
|
|
wake_up_bit(&server->flags, AFS_SERVER_FL_UPDATING);
|
|
_leave(" = %d", success);
|
|
return success;
|
|
}
|
|
|
|
ret = wait_on_bit(&server->flags, AFS_SERVER_FL_UPDATING,
|
|
TASK_INTERRUPTIBLE);
|
|
if (ret == -ERESTARTSYS) {
|
|
fc->ac.error = ret;
|
|
_leave(" = f [intr]");
|
|
return false;
|
|
}
|
|
|
|
retries++;
|
|
if (retries == 4) {
|
|
_leave(" = f [stale]");
|
|
ret = -ESTALE;
|
|
return false;
|
|
}
|
|
goto retry;
|
|
}
|