release/src-rt-6.x.4708/linux/linux-2.6.36/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 "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(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 struct afs_uuid afs_uuid;
  33
  34 /*
  35  * get a client UUID
  36  */
  37 static int __init afs_get_client_UUID(void)
  38 {
  39         struct timespec ts;
  40         u64 uuidtime;
  41         u16 clockseq;
  42         int ret;
  43
  44         /* read the MAC address of one of the external interfaces and construct
  45          * a UUID from it */
  46         ret = afs_get_MAC_address(afs_uuid.node, sizeof(afs_uuid.node));
  47         if (ret < 0)
  48                 return ret;
  49
  50         getnstimeofday(&ts);
  51         uuidtime = (u64) ts.tv_sec * 1000 * 1000 * 10;
  52         uuidtime += ts.tv_nsec / 100;
  53         uuidtime += AFS_UUID_TO_UNIX_TIME;
  54         afs_uuid.time_low = uuidtime;
  55         afs_uuid.time_mid = uuidtime >> 32;
  56         afs_uuid.time_hi_and_version = (uuidtime >> 48) & AFS_UUID_TIMEHI_MASK;
  57         afs_uuid.time_hi_and_version = AFS_UUID_VERSION_TIME;
  58
  59         get_random_bytes(&clockseq, 2);
  60         afs_uuid.clock_seq_low = clockseq;
  61         afs_uuid.clock_seq_hi_and_reserved =
  62                 (clockseq >> 8) & AFS_UUID_CLOCKHI_MASK;
  63         afs_uuid.clock_seq_hi_and_reserved = AFS_UUID_VARIANT_STD;
  64
  65         _debug("AFS UUID: %08x-%04x-%04x-%02x%02x-%02x%02x%02x%02x%02x%02x",
  66                afs_uuid.time_low,
  67                afs_uuid.time_mid,
  68                afs_uuid.time_hi_and_version,
  69                afs_uuid.clock_seq_hi_and_reserved,
  70                afs_uuid.clock_seq_low,
  71                afs_uuid.node[0], afs_uuid.node[1], afs_uuid.node[2],
  72                afs_uuid.node[3], afs_uuid.node[4], afs_uuid.node[5]);
  73
  74         return 0;
  75 }
  76
  77 /*
  78  * initialise the AFS client FS module
  79  */
  80 static int __init afs_init(void)
  81 {
  82         int ret;
  83
  84         printk(KERN_INFO "kAFS: Red Hat AFS client v0.1 registering.\n");
  85
  86         ret = afs_get_client_UUID();
  87         if (ret < 0)
  88                 return ret;
  89
  90         /* register the /proc stuff */
  91         ret = afs_proc_init();
  92         if (ret < 0)
  93                 return ret;
  94
  95 #ifdef CONFIG_AFS_FSCACHE
  96         /* we want to be able to cache */
  97         ret = fscache_register_netfs(&afs_cache_netfs);
  98         if (ret < 0)
  99                 goto error_cache;
 100 #endif
 101
 102         /* initialise the cell DB */
 103         ret = afs_cell_init(rootcell);
 104         if (ret < 0)
 105                 goto error_cell_init;
 106
 107         /* initialise the VL update process */
 108         ret = afs_vlocation_update_init();
 109         if (ret < 0)
 110                 goto error_vl_update_init;
 111
 112         /* initialise the callback update process */
 113         ret = afs_callback_update_init();
 114         if (ret < 0)
 115                 goto error_callback_update_init;
 116
 117         /* create the RxRPC transport */
 118         ret = afs_open_socket();
 119         if (ret < 0)
 120                 goto error_open_socket;
 121
 122         /* register the filesystems */
 123         ret = afs_fs_init();
 124         if (ret < 0)
 125                 goto error_fs;
 126
 127         return ret;
 128
 129 error_fs:
 130         afs_close_socket();
 131 error_open_socket:
 132         afs_callback_update_kill();
 133 error_callback_update_init:
 134         afs_vlocation_purge();
 135 error_vl_update_init:
 136         afs_cell_purge();
 137 error_cell_init:
 138 #ifdef CONFIG_AFS_FSCACHE
 139         fscache_unregister_netfs(&afs_cache_netfs);
 140 error_cache:
 141 #endif
 142         afs_proc_cleanup();
 143         rcu_barrier();
 144         printk(KERN_ERR "kAFS: failed to register: %d\n", ret);
 145         return ret;
 146 }
 147
 148 late_initcall(afs_init);        /* must be called after net/ to create socket */
 149
 150 /*
 151  * clean up on module removal
 152  */
 153 static void __exit afs_exit(void)
 154 {
 155         printk(KERN_INFO "kAFS: Red Hat AFS client v0.1 unregistering.\n");
 156
 157         afs_fs_exit();
 158         afs_kill_lock_manager();
 159         afs_close_socket();
 160         afs_purge_servers();
 161         afs_callback_update_kill();
 162         afs_vlocation_purge();
 163         flush_scheduled_work();
 164         afs_cell_purge();
 165 #ifdef CONFIG_AFS_FSCACHE
 166         fscache_unregister_netfs(&afs_cache_netfs);
 167 #endif
 168         afs_proc_cleanup();
 169         rcu_barrier();
 170 }
 171
 172 module_exit(afs_exit);