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 <linux/ktime.h>
  19 #include "internal.h"
  20
  21 MODULE_DESCRIPTION("AFS Client File System");
  22 MODULE_AUTHOR("Red Hat, Inc.");
  23 MODULE_LICENSE("GPL");
  24
  25 unsigned afs_debug;
  26 module_param_named(debug, afs_debug, uint, S_IWUSR | S_IRUGO);
  27 MODULE_PARM_DESC(debug, "AFS debugging mask");
  28
  29 static char *rootcell;
  30
  31 module_param(rootcell, charp, 0);
  32 MODULE_PARM_DESC(rootcell, "root AFS cell name and VL server IP addr list");
  33
  34 struct afs_uuid afs_uuid;
  35 struct workqueue_struct *afs_wq;
  36
  37 /*
  38  * get a client UUID
  39  */
  40 static int __init afs_get_client_UUID(void)
  41 {
  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         uuidtime = ktime_divns(ktime_get_real(), 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         /* create workqueue */
  91         ret = -ENOMEM;
  92         afs_wq = alloc_workqueue("afs", 0, 0);
  93         if (!afs_wq)
  94                 return ret;
  95
  96         /* register the /proc stuff */
  97         ret = afs_proc_init();
  98         if (ret < 0)
  99                 goto error_proc;
 100
 101 #ifdef CONFIG_AFS_FSCACHE
 102         /* we want to be able to cache */
 103         ret = fscache_register_netfs(&afs_cache_netfs);
 104         if (ret < 0)
 105                 goto error_cache;
 106 #endif
 107
 108         /* initialise the cell DB */
 109         ret = afs_cell_init(rootcell);
 110         if (ret < 0)
 111                 goto error_cell_init;
 112
 113         /* initialise the VL update process */
 114         ret = afs_vlocation_update_init();
 115         if (ret < 0)
 116                 goto error_vl_update_init;
 117
 118         /* initialise the callback update process */
 119         ret = afs_callback_update_init();
 120         if (ret < 0)
 121                 goto error_callback_update_init;
 122
 123         /* create the RxRPC transport */
 124         ret = afs_open_socket();
 125         if (ret < 0)
 126                 goto error_open_socket;
 127
 128         /* register the filesystems */
 129         ret = afs_fs_init();
 130         if (ret < 0)
 131                 goto error_fs;
 132
 133         return ret;
 134
 135 error_fs:
 136         afs_close_socket();
 137 error_open_socket:
 138         afs_callback_update_kill();
 139 error_callback_update_init:
 140         afs_vlocation_purge();
 141 error_vl_update_init:
 142         afs_cell_purge();
 143 error_cell_init:
 144 #ifdef CONFIG_AFS_FSCACHE
 145         fscache_unregister_netfs(&afs_cache_netfs);
 146 error_cache:
 147 #endif
 148         afs_proc_cleanup();
 149 error_proc:
 150         destroy_workqueue(afs_wq);
 151         rcu_barrier();
 152         printk(KERN_ERR "kAFS: failed to register: %d\n", ret);
 153         return ret;
 154 }
 155
 156 /* XXX late_initcall is kludgy, but the only alternative seems to create
 157  * a transport upon the first mount, which is worse. Or is it?
 158  */
 159 late_initcall(afs_init);        /* must be called after net/ to create socket */
 160
 161 /*
 162  * clean up on module removal
 163  */
 164 static void __exit afs_exit(void)
 165 {
 166         printk(KERN_INFO "kAFS: Red Hat AFS client v0.1 unregistering.\n");
 167
 168         afs_fs_exit();
 169         afs_kill_lock_manager();
 170         afs_close_socket();
 171         afs_purge_servers();
 172         afs_callback_update_kill();
 173         afs_vlocation_purge();
 174         destroy_workqueue(afs_wq);
 175         afs_cell_purge();
 176 #ifdef CONFIG_AFS_FSCACHE
 177         fscache_unregister_netfs(&afs_cache_netfs);
 178 #endif
 179         afs_proc_cleanup();
 180         rcu_barrier();
 181 }
 182
 183 module_exit(afs_exit);