fs/afs/main.c

   1 /* AFS client file system
   2  *
   3  * Copyright (C) 2002,5 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 <linux/random.h>
  18 #include "internal.h"
  19
  20 MODULE_DESCRIPTION("AFS Client File System");
  21 MODULE_AUTHOR("Red Hat, Inc.");
  22 MODULE_LICENSE("GPL");
  23
  24 unsigned afs_debug;
  25 module_param_named(debug, afs_debug, uint, S_IWUSR | S_IRUGO);
  26 MODULE_PARM_DESC(debug, "AFS debugging mask");
  27
  28 static char *rootcell;
  29
  30 module_param(rootcell, charp, 0);
  31 MODULE_PARM_DESC(rootcell, "root AFS cell name and VL server IP addr list");
  32
  33 struct afs_uuid afs_uuid;
  34 struct workqueue_struct *afs_wq;
  35
  36 /*
  37  * get a client UUID
  38  */
  39 static int __init afs_get_client_UUID(void)
  40 {
  41         struct timespec ts;
  42         u64 uuidtime;
  43         u16 clockseq;
  44         int ret;
  45
  46         /* read the MAC address of one of the external interfaces and construct
  47          * a UUID from it */
  48         ret = afs_get_MAC_address(afs_uuid.node, sizeof(afs_uuid.node));
  49         if (ret < 0)
  50                 return ret;
  51
  52         getnstimeofday(&ts);
  53         uuidtime = (u64) ts.tv_sec * 1000 * 1000 * 10;
  54         uuidtime += ts.tv_nsec / 100;
  55         uuidtime += AFS_UUID_TO_UNIX_TIME;
  56         afs_uuid.time_low = uuidtime;
  57         afs_uuid.time_mid = uuidtime >> 32;
  58         afs_uuid.time_hi_and_version = (uuidtime >> 48) & AFS_UUID_TIMEHI_MASK;
  59         afs_uuid.time_hi_and_version |= AFS_UUID_VERSION_TIME;
  60
  61         get_random_bytes(&clockseq, 2);
  62         afs_uuid.clock_seq_low = clockseq;
  63         afs_uuid.clock_seq_hi_and_reserved =
  64                 (clockseq >> 8) & AFS_UUID_CLOCKHI_MASK;
  65         afs_uuid.clock_seq_hi_and_reserved |= AFS_UUID_VARIANT_STD;
  66
  67         _debug("AFS UUID: %08x-%04x-%04x-%02x%02x-%02x%02x%02x%02x%02x%02x",
  68                afs_uuid.time_low,
  69                afs_uuid.time_mid,
  70                afs_uuid.time_hi_and_version,
  71                afs_uuid.clock_seq_hi_and_reserved,
  72                afs_uuid.clock_seq_low,
  73                afs_uuid.node[0], afs_uuid.node[1], afs_uuid.node[2],
  74                afs_uuid.node[3], afs_uuid.node[4], afs_uuid.node[5]);
  75
  76         return 0;
  77 }
  78
  79 /*
  80  * initialise the AFS client FS module
  81  */
  82 static int __init afs_init(void)
  83 {
  84         int ret;
  85
  86         printk(KERN_INFO "kAFS: Red Hat AFS client v0.1 registering.\n");
  87
  88         ret = afs_get_client_UUID();
  89         if (ret < 0)
  90                 return ret;
  91
  92         /* create workqueue */
  93         ret = -ENOMEM;
  94         afs_wq = alloc_workqueue("afs", 0, 0);
  95         if (!afs_wq)
  96                 return ret;
  97
  98         /* register the /proc stuff */
  99         ret = afs_proc_init();
 100         if (ret < 0)
 101                 goto error_proc;
 102
 103 #ifdef CONFIG_AFS_FSCACHE
 104         /* we want to be able to cache */
 105         ret = fscache_register_netfs(&afs_cache_netfs);
 106         if (ret < 0)
 107                 goto error_cache;
 108 #endif
 109
 110         /* initialise the cell DB */
 111         ret = afs_cell_init(rootcell);
 112         if (ret < 0)
 113                 goto error_cell_init;
 114
 115         /* initialise the VL update process */
 116         ret = afs_vlocation_update_init();
 117         if (ret < 0)
 118                 goto error_vl_update_init;
 119
 120         /* initialise the callback update process */
 121         ret = afs_callback_update_init();
 122         if (ret < 0)
 123                 goto error_callback_update_init;
 124
 125         /* create the RxRPC transport */
 126         ret = afs_open_socket();
 127         if (ret < 0)
 128                 goto error_open_socket;
 129
 130         /* register the filesystems */
 131         ret = afs_fs_init();
 132         if (ret < 0)
 133                 goto error_fs;
 134
 135         return ret;
 136
 137 error_fs:
 138         afs_close_socket();
 139 error_open_socket:
 140         afs_callback_update_kill();
 141 error_callback_update_init:
 142         afs_vlocation_purge();
 143 error_vl_update_init:
 144         afs_cell_purge();
 145 error_cell_init:
 146 #ifdef CONFIG_AFS_FSCACHE
 147         fscache_unregister_netfs(&afs_cache_netfs);
 148 error_cache:
 149 #endif
 150         afs_proc_cleanup();
 151 error_proc:
 152         destroy_workqueue(afs_wq);
 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         destroy_workqueue(afs_wq);
 177         afs_cell_purge();
 178 #ifdef CONFIG_AFS_FSCACHE
 179         fscache_unregister_netfs(&afs_cache_netfs);
 180 #endif
 181         afs_proc_cleanup();
 182         rcu_barrier();
 183 }
 184
 185 module_exit(afs_exit);