fs/afs/main.c

   1 /* AFS client file system
   2  *
   3  * Copyright (C) 2002 Red Hat, Inc. All Rights Reserved.
   4  * Written by David Howells (dhowells@redhat.com)
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License
   8  * as published by the Free Software Foundation; either version
   9  * 2 of the License, or (at your option) any later version.
  10  */
  11
  12 #include <linux/module.h>
  13 #include <linux/moduleparam.h>
  14 #include <linux/init.h>
  15 #include <linux/completion.h>
  16 #include <linux/sched.h>
  17 #include "internal.h"
  18
  19 MODULE_DESCRIPTION("AFS Client File System");
  20 MODULE_AUTHOR("Red Hat, Inc.");
  21 MODULE_LICENSE("GPL");
  22
  23 unsigned afs_debug;
  24 module_param_named(debug, afs_debug, uint, S_IWUSR | S_IRUGO);
  25 MODULE_PARM_DESC(afs_debug, "AFS debugging mask");
  26
  27 static char *rootcell;
  28
  29 module_param(rootcell, charp, 0);
  30 MODULE_PARM_DESC(rootcell, "root AFS cell name and VL server IP addr list");
  31
  32 #ifdef AFS_CACHING_SUPPORT
  33 static struct cachefs_netfs_operations afs_cache_ops = {
  34         .get_page_cookie        = afs_cache_get_page_cookie,
  35 };
  36
  37 struct cachefs_netfs afs_cache_netfs = {
  38         .name                   = "afs",
  39         .version                = 0,
  40         .ops                    = &afs_cache_ops,
  41 };
  42 #endif
  43
  44 struct afs_uuid afs_uuid;
  45
  46 /*
  47  * get a client UUID
  48  */
  49 static int __init afs_get_client_UUID(void)
  50 {
  51         struct timespec ts;
  52         u64 uuidtime;
  53         u16 clockseq;
  54         int ret;
  55
  56         /* read the MAC address of one of the external interfaces and construct
  57          * a UUID from it */
  58         ret = afs_get_MAC_address(afs_uuid.node, sizeof(afs_uuid.node));
  59         if (ret < 0)
  60                 return ret;
  61
  62         getnstimeofday(&ts);
  63         uuidtime = (u64) ts.tv_sec * 1000 * 1000 * 10;
  64         uuidtime += ts.tv_nsec / 100;
  65         uuidtime += AFS_UUID_TO_UNIX_TIME;
  66         afs_uuid.time_low = uuidtime;
  67         afs_uuid.time_mid = uuidtime >> 32;
  68         afs_uuid.time_hi_and_version = (uuidtime >> 48) & AFS_UUID_TIMEHI_MASK;
  69         afs_uuid.time_hi_and_version = AFS_UUID_VERSION_TIME;
  70
  71         get_random_bytes(&clockseq, 2);
  72         afs_uuid.clock_seq_low = clockseq;
  73         afs_uuid.clock_seq_hi_and_reserved =
  74                 (clockseq >> 8) & AFS_UUID_CLOCKHI_MASK;
  75         afs_uuid.clock_seq_hi_and_reserved = AFS_UUID_VARIANT_STD;
  76
  77         _debug("AFS UUID: %08x-%04x-%04x-%02x%02x-%02x%02x%02x%02x%02x%02x",
  78                afs_uuid.time_low,
  79                afs_uuid.time_mid,
  80                afs_uuid.time_hi_and_version,
  81                afs_uuid.clock_seq_hi_and_reserved,
  82                afs_uuid.clock_seq_low,
  83                afs_uuid.node[0], afs_uuid.node[1], afs_uuid.node[2],
  84                afs_uuid.node[3], afs_uuid.node[4], afs_uuid.node[5]);
  85
  86         return 0;
  87 }
  88
  89 /*
  90  * initialise the AFS client FS module
  91  */
  92 static int __init afs_init(void)
  93 {
  94         int ret;
  95
  96         printk(KERN_INFO "kAFS: Red Hat AFS client v0.1 registering.\n");
  97
  98         ret = afs_get_client_UUID();
  99         if (ret < 0)
 100                 return ret;
 101
 102         /* register the /proc stuff */
 103         ret = afs_proc_init();
 104         if (ret < 0)
 105                 return ret;
 106
 107 #ifdef AFS_CACHING_SUPPORT
 108         /* we want to be able to cache */
 109         ret = cachefs_register_netfs(&afs_cache_netfs,
 110                                      &afs_cache_cell_index_def);
 111         if (ret < 0)
 112                 goto error_cache;
 113 #endif
 114
 115         /* initialise the cell DB */
 116         ret = afs_cell_init(rootcell);
 117         if (ret < 0)
 118                 goto error_cell_init;
 119
 120         /* initialise the VL update process */
 121         ret = afs_vlocation_update_init();
 122         if (ret < 0)
 123                 goto error_vl_update_init;
 124
 125         /* initialise the callback update process */
 126         ret = afs_callback_update_init();
 127
 128         /* create the RxRPC transport */
 129         ret = afs_open_socket();
 130         if (ret < 0)
 131                 goto error_open_socket;
 132
 133         /* register the filesystems */
 134         ret = afs_fs_init();
 135         if (ret < 0)
 136                 goto error_fs;
 137
 138         return ret;
 139
 140 error_fs:
 141         afs_close_socket();
 142 error_open_socket:
 143 error_vl_update_init:
 144 error_cell_init:
 145 #ifdef AFS_CACHING_SUPPORT
 146         cachefs_unregister_netfs(&afs_cache_netfs);
 147 error_cache:
 148 #endif
 149         afs_callback_update_kill();
 150         afs_vlocation_purge();
 151         afs_cell_purge();
 152         afs_proc_cleanup();
 153         rcu_barrier();
 154         printk(KERN_ERR "kAFS: failed to register: %d\n", ret);
 155         return ret;
 156 }
 157
 158 /* XXX late_initcall is kludgy, but the only alternative seems to create
 159  * a transport upon the first mount, which is worse. Or is it?
 160  */
 161 late_initcall(afs_init);        /* must be called after net/ to create socket */
 162
 163 /*
 164  * clean up on module removal
 165  */
 166 static void __exit afs_exit(void)
 167 {
 168         printk(KERN_INFO "kAFS: Red Hat AFS client v0.1 unregistering.\n");
 169
 170         afs_fs_exit();
 171         afs_kill_lock_manager();
 172         afs_close_socket();
 173         afs_purge_servers();
 174         afs_callback_update_kill();
 175         afs_vlocation_purge();
 176         flush_scheduled_work();
 177         afs_cell_purge();
 178 #ifdef AFS_CACHING_SUPPORT
 179         cachefs_unregister_netfs(&afs_cache_netfs);
 180 #endif
 181         afs_proc_cleanup();
 182         rcu_barrier();
 183 }
 184
 185 module_exit(afs_exit);