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