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1// SPDX-License-Identifier: GPL-2.0-or-later2/* AFS client file system3 *4 * Copyright (C) 2002,5 Red Hat, Inc. All Rights Reserved.5 * Written by David Howells (dhowells@redhat.com)6 */7 8#include <linux/module.h>9#include <linux/moduleparam.h>10#include <linux/init.h>11#include <linux/completion.h>12#include <linux/sched.h>13#include <linux/random.h>14#include <linux/proc_fs.h>15#define CREATE_TRACE_POINTS16#include "internal.h"17 18MODULE_DESCRIPTION("AFS Client File System");19MODULE_AUTHOR("Red Hat, Inc.");20MODULE_LICENSE("GPL");21 22unsigned afs_debug;23module_param_named(debug, afs_debug, uint, S_IWUSR | S_IRUGO);24MODULE_PARM_DESC(debug, "AFS debugging mask");25 26static char *rootcell;27 28module_param(rootcell, charp, 0);29MODULE_PARM_DESC(rootcell, "root AFS cell name and VL server IP addr list");30 31struct workqueue_struct *afs_wq;32static struct proc_dir_entry *afs_proc_symlink;33 34#if defined(CONFIG_ALPHA)35const char afs_init_sysname[] = "alpha_linux26";36#elif defined(CONFIG_X86_64)37const char afs_init_sysname[] = "amd64_linux26";38#elif defined(CONFIG_ARM)39const char afs_init_sysname[] = "arm_linux26";40#elif defined(CONFIG_ARM64)41const char afs_init_sysname[] = "aarch64_linux26";42#elif defined(CONFIG_X86_32)43const char afs_init_sysname[] = "i386_linux26";44#elif defined(CONFIG_PPC64)45const char afs_init_sysname[] = "ppc64_linux26";46#elif defined(CONFIG_PPC32)47const char afs_init_sysname[] = "ppc_linux26";48#elif defined(CONFIG_S390)49#ifdef CONFIG_64BIT50const char afs_init_sysname[] = "s390x_linux26";51#else52const char afs_init_sysname[] = "s390_linux26";53#endif54#elif defined(CONFIG_SPARC64)55const char afs_init_sysname[] = "sparc64_linux26";56#elif defined(CONFIG_SPARC32)57const char afs_init_sysname[] = "sparc_linux26";58#else59const char afs_init_sysname[] = "unknown_linux26";60#endif61 62/*63 * Initialise an AFS network namespace record.64 */65static int __net_init afs_net_init(struct net *net_ns)66{67	struct afs_sysnames *sysnames;68	struct afs_net *net = afs_net(net_ns);69	int ret;70 71	net->net = net_ns;72	net->live = true;73	generate_random_uuid((unsigned char *)&net->uuid);74 75	INIT_WORK(&net->charge_preallocation_work, afs_charge_preallocation);76	mutex_init(&net->socket_mutex);77 78	net->cells = RB_ROOT;79	init_rwsem(&net->cells_lock);80	INIT_WORK(&net->cells_manager, afs_manage_cells);81	timer_setup(&net->cells_timer, afs_cells_timer, 0);82 83	mutex_init(&net->cells_alias_lock);84	mutex_init(&net->proc_cells_lock);85	INIT_HLIST_HEAD(&net->proc_cells);86 87	seqlock_init(&net->fs_lock);88	net->fs_servers = RB_ROOT;89	INIT_LIST_HEAD(&net->fs_probe_fast);90	INIT_LIST_HEAD(&net->fs_probe_slow);91	INIT_HLIST_HEAD(&net->fs_proc);92 93	INIT_HLIST_HEAD(&net->fs_addresses);94	seqlock_init(&net->fs_addr_lock);95 96	INIT_WORK(&net->fs_manager, afs_manage_servers);97	timer_setup(&net->fs_timer, afs_servers_timer, 0);98	INIT_WORK(&net->fs_prober, afs_fs_probe_dispatcher);99	timer_setup(&net->fs_probe_timer, afs_fs_probe_timer, 0);100	atomic_set(&net->servers_outstanding, 1);101 102	ret = -ENOMEM;103	sysnames = kzalloc(sizeof(*sysnames), GFP_KERNEL);104	if (!sysnames)105		goto error_sysnames;106	sysnames->subs[0] = (char *)&afs_init_sysname;107	sysnames->nr = 1;108	refcount_set(&sysnames->usage, 1);109	net->sysnames = sysnames;110	rwlock_init(&net->sysnames_lock);111 112	/* Register the /proc stuff */113	ret = afs_proc_init(net);114	if (ret < 0)115		goto error_proc;116 117	/* Initialise the cell DB */118	ret = afs_cell_init(net, rootcell);119	if (ret < 0)120		goto error_cell_init;121 122	/* Create the RxRPC transport */123	ret = afs_open_socket(net);124	if (ret < 0)125		goto error_open_socket;126 127	return 0;128 129error_open_socket:130	net->live = false;131	afs_fs_probe_cleanup(net);132	afs_cell_purge(net);133	afs_purge_servers(net);134error_cell_init:135	net->live = false;136	afs_proc_cleanup(net);137error_proc:138	afs_put_sysnames(net->sysnames);139error_sysnames:140	net->live = false;141	return ret;142}143 144/*145 * Clean up and destroy an AFS network namespace record.146 */147static void __net_exit afs_net_exit(struct net *net_ns)148{149	struct afs_net *net = afs_net(net_ns);150 151	net->live = false;152	afs_fs_probe_cleanup(net);153	afs_cell_purge(net);154	afs_purge_servers(net);155	afs_close_socket(net);156	afs_proc_cleanup(net);157	afs_put_sysnames(net->sysnames);158	kfree_rcu(rcu_access_pointer(net->address_prefs), rcu);159}160 161static struct pernet_operations afs_net_ops = {162	.init	= afs_net_init,163	.exit	= afs_net_exit,164	.id	= &afs_net_id,165	.size	= sizeof(struct afs_net),166};167 168/*169 * initialise the AFS client FS module170 */171static int __init afs_init(void)172{173	int ret = -ENOMEM;174 175	printk(KERN_INFO "kAFS: Red Hat AFS client v0.1 registering.\n");176 177	afs_wq = alloc_workqueue("afs", 0, 0);178	if (!afs_wq)179		goto error_afs_wq;180	afs_async_calls = alloc_workqueue("kafsd", WQ_MEM_RECLAIM, 0);181	if (!afs_async_calls)182		goto error_async;183	afs_lock_manager = alloc_workqueue("kafs_lockd", WQ_MEM_RECLAIM, 0);184	if (!afs_lock_manager)185		goto error_lockmgr;186 187	ret = register_pernet_device(&afs_net_ops);188	if (ret < 0)189		goto error_net;190 191	/* register the filesystems */192	ret = afs_fs_init();193	if (ret < 0)194		goto error_fs;195 196	afs_proc_symlink = proc_symlink("fs/afs", NULL, "../self/net/afs");197	if (!afs_proc_symlink) {198		ret = -ENOMEM;199		goto error_proc;200	}201 202	return ret;203 204error_proc:205	afs_fs_exit();206error_fs:207	unregister_pernet_device(&afs_net_ops);208error_net:209	destroy_workqueue(afs_lock_manager);210error_lockmgr:211	destroy_workqueue(afs_async_calls);212error_async:213	destroy_workqueue(afs_wq);214error_afs_wq:215	rcu_barrier();216	printk(KERN_ERR "kAFS: failed to register: %d\n", ret);217	return ret;218}219 220/* XXX late_initcall is kludgy, but the only alternative seems to create221 * a transport upon the first mount, which is worse. Or is it?222 */223late_initcall(afs_init);	/* must be called after net/ to create socket */224 225/*226 * clean up on module removal227 */228static void __exit afs_exit(void)229{230	printk(KERN_INFO "kAFS: Red Hat AFS client v0.1 unregistering.\n");231 232	proc_remove(afs_proc_symlink);233	afs_fs_exit();234	unregister_pernet_device(&afs_net_ops);235	destroy_workqueue(afs_lock_manager);236	destroy_workqueue(afs_async_calls);237	destroy_workqueue(afs_wq);238	afs_clean_up_permit_cache();239	rcu_barrier();240}241 242module_exit(afs_exit);243