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 "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(afs_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 #ifdef AFS_CACHING_SUPPORT
  32 static struct cachefs_netfs_operations afs_cache_ops = {
  33         .get_page_cookie        = afs_cache_get_page_cookie,
  34 };
  35
  36 struct cachefs_netfs afs_cache_netfs = {
  37         .name                   = "afs",
  38         .version                = 0,
  39         .ops                    = &afs_cache_ops,
  40 };
  41 #endif
  42
  43 struct afs_uuid afs_uuid;
  44
  45 /*
  46  * get a client UUID
  47  */
  48 static int __init afs_get_client_UUID(void)
  49 {
  50         struct timespec ts;
  51         u64 uuidtime;
  52         u16 clockseq;
  53         int ret;
  54
  55         /* read the MAC address of one of the external interfaces and construct
  56          * a UUID from it */
  57         ret = afs_get_MAC_address(afs_uuid.node, sizeof(afs_uuid.node));
  58         if (ret < 0)
  59                 return ret;
  60
  61         getnstimeofday(&ts);
  62         uuidtime = (u64) ts.tv_sec * 1000 * 1000 * 10;
  63         uuidtime += ts.tv_nsec / 100;
  64         uuidtime += AFS_UUID_TO_UNIX_TIME;
  65         afs_uuid.time_low = uuidtime;
  66         afs_uuid.time_mid = uuidtime >> 32;
  67         afs_uuid.time_hi_and_version = (uuidtime >> 48) & AFS_UUID_TIMEHI_MASK;
  68         afs_uuid.time_hi_and_version = AFS_UUID_VERSION_TIME;
  69
  70         get_random_bytes(&clockseq, 2);
  71         afs_uuid.clock_seq_low = clockseq;
  72         afs_uuid.clock_seq_hi_and_reserved =
  73                 (clockseq >> 8) & AFS_UUID_CLOCKHI_MASK;
  74         afs_uuid.clock_seq_hi_and_reserved = AFS_UUID_VARIANT_STD;
  75
  76         _debug("AFS UUID: %08x-%04x-%04x-%02x%02x-%02x%02x%02x%02x%02x%02x",
  77                afs_uuid.time_low,
  78                afs_uuid.time_mid,
  79                afs_uuid.time_hi_and_version,
  80                afs_uuid.clock_seq_hi_and_reserved,
  81                afs_uuid.clock_seq_low,
  82                afs_uuid.node[0], afs_uuid.node[1], afs_uuid.node[2],
  83                afs_uuid.node[3], afs_uuid.node[4], afs_uuid.node[5]);
  84
  85         return 0;
  86 }
  87
  88 /*
  89  * initialise the AFS client FS module
  90  */
  91 static int __init afs_init(void)
  92 {
  93         int ret;
  94
  95         printk(KERN_INFO "kAFS: Red Hat AFS client v0.1 registering.\n");
  96
  97         ret = afs_get_client_UUID();
  98         if (ret < 0)
  99                 return ret;
 100
 101         /* register the /proc stuff */
 102         ret = afs_proc_init();
 103         if (ret < 0)
 104                 return ret;
 105
 106 #ifdef AFS_CACHING_SUPPORT
 107         /* we want to be able to cache */
 108         ret = cachefs_register_netfs(&afs_cache_netfs,
 109                                      &afs_cache_cell_index_def);
 110         if (ret < 0)
 111                 goto error_cache;
 112 #endif
 113
 114         /* initialise the cell DB */
 115         ret = afs_cell_init(rootcell);
 116         if (ret < 0)
 117                 goto error_cell_init;
 118
 119         /* initialise the VL update process */
 120         ret = afs_vlocation_update_init();
 121         if (ret < 0)
 122                 goto error_vl_update_init;
 123
 124         /* initialise the callback update process */
 125         ret = afs_callback_update_init();
 126
 127         /* create the RxRPC transport */
 128         ret = afs_open_socket();
 129         if (ret < 0)
 130                 goto error_open_socket;
 131
 132         /* register the filesystems */
 133         ret = afs_fs_init();
 134         if (ret < 0)
 135                 goto error_fs;
 136
 137         return ret;
 138
 139 error_fs:
 140         afs_close_socket();
 141 error_open_socket:
 142 error_vl_update_init:
 143 error_cell_init:
 144 #ifdef AFS_CACHING_SUPPORT
 145         cachefs_unregister_netfs(&afs_cache_netfs);
 146 error_cache:
 147 #endif
 148         afs_callback_update_kill();
 149         afs_vlocation_purge();
 150         afs_cell_purge();
 151         afs_proc_cleanup();
 152         rcu_barrier();
 153         printk(KERN_ERR "kAFS: failed to register: %d\n", ret);
 154         return ret;
 155 }
 156
 157 /* XXX late_initcall is kludgy, but the only alternative seems to create
 158  * a transport upon the first mount, which is worse. Or is it?
 159  */
 160 late_initcall(afs_init);        /* must be called after net/ to create socket */
 161
 162 /*
 163  * clean up on module removal
 164  */
 165 static void __exit afs_exit(void)
 166 {
 167         printk(KERN_INFO "kAFS: Red Hat AFS client v0.1 unregistering.\n");
 168
 169         afs_fs_exit();
 170         afs_close_socket();
 171         afs_purge_servers();
 172         afs_callback_update_kill();
 173         afs_vlocation_purge();
 174         flush_scheduled_work();
 175         afs_cell_purge();
 176 #ifdef AFS_CACHING_SUPPORT
 177         cachefs_unregister_netfs(&afs_cache_netfs);
 178 #endif
 179         afs_proc_cleanup();
 180         rcu_barrier();
 181 }
 182
 183 module_exit(afs_exit);