1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* AFS client file system 3 * 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_POINTS 16 #include "internal.h" 17 18 MODULE_DESCRIPTION("AFS Client File System"); 19 MODULE_AUTHOR("Red Hat, Inc."); 20 MODULE_LICENSE("GPL"); 21 22 unsigned afs_debug; 23 module_param_named(debug, afs_debug, uint, S_IWUSR | S_IRUGO); 24 MODULE_PARM_DESC(debug, "AFS debugging mask"); 25 26 static char *rootcell; 27 28 module_param(rootcell, charp, 0); 29 MODULE_PARM_DESC(rootcell, "root AFS cell name and VL server IP addr list"); 30 31 struct workqueue_struct *afs_wq; 32 static struct proc_dir_entry *afs_proc_symlink; 33 34 #if defined(CONFIG_ALPHA) 35 const char afs_init_sysname[] = "alpha_linux26"; 36 #elif defined(CONFIG_X86_64) 37 const char afs_init_sysname[] = "amd64_linux26"; 38 #elif defined(CONFIG_ARM) 39 const char afs_init_sysname[] = "arm_linux26"; 40 #elif defined(CONFIG_ARM64) 41 const char afs_init_sysname[] = "aarch64_linux26"; 42 #elif defined(CONFIG_X86_32) 43 const char afs_init_sysname[] = "i386_linux26"; 44 #elif defined(CONFIG_PPC64) 45 const char afs_init_sysname[] = "ppc64_linux26"; 46 #elif defined(CONFIG_PPC32) 47 const char afs_init_sysname[] = "ppc_linux26"; 48 #elif defined(CONFIG_S390) 49 #ifdef CONFIG_64BIT 50 const char afs_init_sysname[] = "s390x_linux26"; 51 #else 52 const char afs_init_sysname[] = "s390_linux26"; 53 #endif 54 #elif defined(CONFIG_SPARC64) 55 const char afs_init_sysname[] = "sparc64_linux26"; 56 #elif defined(CONFIG_SPARC32) 57 const char afs_init_sysname[] = "sparc_linux26"; 58 #else 59 const char afs_init_sysname[] = "unknown_linux26"; 60 #endif 61 62 /* 63 * Initialise an AFS network namespace record. 64 */ 65 static 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_addresses4); 94 INIT_HLIST_HEAD(&net->fs_addresses6); 95 seqlock_init(&net->fs_addr_lock); 96 97 INIT_WORK(&net->fs_manager, afs_manage_servers); 98 timer_setup(&net->fs_timer, afs_servers_timer, 0); 99 INIT_WORK(&net->fs_prober, afs_fs_probe_dispatcher); 100 timer_setup(&net->fs_probe_timer, afs_fs_probe_timer, 0); 101 atomic_set(&net->servers_outstanding, 1); 102 103 ret = -ENOMEM; 104 sysnames = kzalloc(sizeof(*sysnames), GFP_KERNEL); 105 if (!sysnames) 106 goto error_sysnames; 107 sysnames->subs[0] = (char *)&afs_init_sysname; 108 sysnames->nr = 1; 109 refcount_set(&sysnames->usage, 1); 110 net->sysnames = sysnames; 111 rwlock_init(&net->sysnames_lock); 112 113 /* Register the /proc stuff */ 114 ret = afs_proc_init(net); 115 if (ret < 0) 116 goto error_proc; 117 118 /* Initialise the cell DB */ 119 ret = afs_cell_init(net, rootcell); 120 if (ret < 0) 121 goto error_cell_init; 122 123 /* Create the RxRPC transport */ 124 ret = afs_open_socket(net); 125 if (ret < 0) 126 goto error_open_socket; 127 128 return 0; 129 130 error_open_socket: 131 net->live = false; 132 afs_fs_probe_cleanup(net); 133 afs_cell_purge(net); 134 afs_purge_servers(net); 135 error_cell_init: 136 net->live = false; 137 afs_proc_cleanup(net); 138 error_proc: 139 afs_put_sysnames(net->sysnames); 140 error_sysnames: 141 net->live = false; 142 return ret; 143 } 144 145 /* 146 * Clean up and destroy an AFS network namespace record. 147 */ 148 static void __net_exit afs_net_exit(struct net *net_ns) 149 { 150 struct afs_net *net = afs_net(net_ns); 151 152 net->live = false; 153 afs_fs_probe_cleanup(net); 154 afs_cell_purge(net); 155 afs_purge_servers(net); 156 afs_close_socket(net); 157 afs_proc_cleanup(net); 158 afs_put_sysnames(net->sysnames); 159 kfree_rcu(rcu_access_pointer(net->address_prefs), rcu); 160 } 161 162 static struct pernet_operations afs_net_ops = { 163 .init = afs_net_init, 164 .exit = afs_net_exit, 165 .id = &afs_net_id, 166 .size = sizeof(struct afs_net), 167 }; 168 169 /* 170 * initialise the AFS client FS module 171 */ 172 static int __init afs_init(void) 173 { 174 int ret = -ENOMEM; 175 176 printk(KERN_INFO "kAFS: Red Hat AFS client v0.1 registering.\n"); 177 178 afs_wq = alloc_workqueue("afs", 0, 0); 179 if (!afs_wq) 180 goto error_afs_wq; 181 afs_async_calls = alloc_workqueue("kafsd", WQ_MEM_RECLAIM, 0); 182 if (!afs_async_calls) 183 goto error_async; 184 afs_lock_manager = alloc_workqueue("kafs_lockd", WQ_MEM_RECLAIM, 0); 185 if (!afs_lock_manager) 186 goto error_lockmgr; 187 188 ret = register_pernet_device(&afs_net_ops); 189 if (ret < 0) 190 goto error_net; 191 192 /* register the filesystems */ 193 ret = afs_fs_init(); 194 if (ret < 0) 195 goto error_fs; 196 197 afs_proc_symlink = proc_symlink("fs/afs", NULL, "../self/net/afs"); 198 if (!afs_proc_symlink) { 199 ret = -ENOMEM; 200 goto error_proc; 201 } 202 203 return ret; 204 205 error_proc: 206 afs_fs_exit(); 207 error_fs: 208 unregister_pernet_device(&afs_net_ops); 209 error_net: 210 destroy_workqueue(afs_lock_manager); 211 error_lockmgr: 212 destroy_workqueue(afs_async_calls); 213 error_async: 214 destroy_workqueue(afs_wq); 215 error_afs_wq: 216 rcu_barrier(); 217 printk(KERN_ERR "kAFS: failed to register: %d\n", ret); 218 return ret; 219 } 220 221 /* XXX late_initcall is kludgy, but the only alternative seems to create 222 * a transport upon the first mount, which is worse. Or is it? 223 */ 224 late_initcall(afs_init); /* must be called after net/ to create socket */ 225 226 /* 227 * clean up on module removal 228 */ 229 static void __exit afs_exit(void) 230 { 231 printk(KERN_INFO "kAFS: Red Hat AFS client v0.1 unregistering.\n"); 232 233 proc_remove(afs_proc_symlink); 234 afs_fs_exit(); 235 unregister_pernet_device(&afs_net_ops); 236 destroy_workqueue(afs_lock_manager); 237 destroy_workqueue(afs_async_calls); 238 destroy_workqueue(afs_wq); 239 afs_clean_up_permit_cache(); 240 rcu_barrier(); 241 } 242 243 module_exit(afs_exit); 244