fs/afs/main.c

   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_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
 129 error_open_socket:
 130         net->live = false;
 131         afs_fs_probe_cleanup(net);
 132         afs_cell_purge(net);
 133         afs_purge_servers(net);
 134 error_cell_init:
 135         net->live = false;
 136         afs_proc_cleanup(net);
 137 error_proc:
 138         afs_put_sysnames(net->sysnames);
 139 error_sysnames:
 140         net->live = false;
 141         return ret;
 142 }
 143
 144 /*
 145  * Clean up and destroy an AFS network namespace record.
 146  */
 147 static 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
 161 static 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 module
 170  */
 171 static 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
 204 error_proc:
 205         afs_fs_exit();
 206 error_fs:
 207         unregister_pernet_device(&afs_net_ops);
 208 error_net:
 209         destroy_workqueue(afs_lock_manager);
 210 error_lockmgr:
 211         destroy_workqueue(afs_async_calls);
 212 error_async:
 213         destroy_workqueue(afs_wq);
 214 error_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 create
 221  * a transport upon the first mount, which is worse. Or is it?
 222  */
 223 late_initcall(afs_init);        /* must be called after net/ to create socket */
 224
 225 /*
 226  * clean up on module removal
 227  */
 228 static 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
 242 module_exit(afs_exit);