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/ktime.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         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         uuidtime = ktime_divns(ktime_get_real(), 100);
  52         uuidtime += AFS_UUID_TO_UNIX_TIME;
  53         afs_uuid.time_low = uuidtime;
  54         afs_uuid.time_mid = uuidtime >> 32;
  55         afs_uuid.time_hi_and_version = (uuidtime >> 48) & AFS_UUID_TIMEHI_MASK;
  56         afs_uuid.time_hi_and_version |= AFS_UUID_VERSION_TIME;
  57
  58         get_random_bytes(&clockseq, 2);
  59         afs_uuid.clock_seq_low = clockseq;
  60         afs_uuid.clock_seq_hi_and_reserved =
  61                 (clockseq >> 8) & AFS_UUID_CLOCKHI_MASK;
  62         afs_uuid.clock_seq_hi_and_reserved |= AFS_UUID_VARIANT_STD;
  63
  64         _debug("AFS UUID: %08x-%04x-%04x-%02x%02x-%02x%02x%02x%02x%02x%02x",
  65                afs_uuid.time_low,
  66                afs_uuid.time_mid,
  67                afs_uuid.time_hi_and_version,
  68                afs_uuid.clock_seq_hi_and_reserved,
  69                afs_uuid.clock_seq_low,
  70                afs_uuid.node[0], afs_uuid.node[1], afs_uuid.node[2],
  71                afs_uuid.node[3], afs_uuid.node[4], afs_uuid.node[5]);
  72
  73         return 0;
  74 }
  75
  76 /*
  77  * initialise the AFS client FS module
  78  */
  79 static int __init afs_init(void)
  80 {
  81         int ret;
  82
  83         printk(KERN_INFO "kAFS: Red Hat AFS client v0.1 registering.\n");
  84
  85         ret = afs_get_client_UUID();
  86         if (ret < 0)
  87                 return ret;
  88
  89         /* create workqueue */
  90         ret = -ENOMEM;
  91         afs_wq = alloc_workqueue("afs", 0, 0);
  92         if (!afs_wq)
  93                 return ret;
  94
  95         /* register the /proc stuff */
  96         ret = afs_proc_init();
  97         if (ret < 0)
  98                 goto error_proc;
  99
 100 #ifdef CONFIG_AFS_FSCACHE
 101         /* we want to be able to cache */
 102         ret = fscache_register_netfs(&afs_cache_netfs);
 103         if (ret < 0)
 104                 goto error_cache;
 105 #endif
 106
 107         /* initialise the cell DB */
 108         ret = afs_cell_init(rootcell);
 109         if (ret < 0)
 110                 goto error_cell_init;
 111
 112         /* initialise the VL update process */
 113         ret = afs_vlocation_update_init();
 114         if (ret < 0)
 115                 goto error_vl_update_init;
 116
 117         /* initialise the callback update process */
 118         ret = afs_callback_update_init();
 119         if (ret < 0)
 120                 goto error_callback_update_init;
 121
 122         /* create the RxRPC transport */
 123         ret = afs_open_socket();
 124         if (ret < 0)
 125                 goto error_open_socket;
 126
 127         /* register the filesystems */
 128         ret = afs_fs_init();
 129         if (ret < 0)
 130                 goto error_fs;
 131
 132         return ret;
 133
 134 error_fs:
 135         afs_close_socket();
 136 error_open_socket:
 137         afs_callback_update_kill();
 138 error_callback_update_init:
 139         afs_vlocation_purge();
 140 error_vl_update_init:
 141         afs_cell_purge();
 142 error_cell_init:
 143 #ifdef CONFIG_AFS_FSCACHE
 144         fscache_unregister_netfs(&afs_cache_netfs);
 145 error_cache:
 146 #endif
 147         afs_proc_cleanup();
 148 error_proc:
 149         destroy_workqueue(afs_wq);
 150         rcu_barrier();
 151         printk(KERN_ERR "kAFS: failed to register: %d\n", ret);
 152         return ret;
 153 }
 154
 155 /* XXX late_initcall is kludgy, but the only alternative seems to create
 156  * a transport upon the first mount, which is worse. Or is it?
 157  */
 158 late_initcall(afs_init);        /* must be called after net/ to create socket */
 159
 160 /*
 161  * clean up on module removal
 162  */
 163 static void __exit afs_exit(void)
 164 {
 165         printk(KERN_INFO "kAFS: Red Hat AFS client v0.1 unregistering.\n");
 166
 167         afs_fs_exit();
 168         afs_kill_lock_manager();
 169         afs_close_socket();
 170         afs_purge_servers();
 171         afs_callback_update_kill();
 172         afs_vlocation_purge();
 173         destroy_workqueue(afs_wq);
 174         afs_cell_purge();
 175 #ifdef CONFIG_AFS_FSCACHE
 176         fscache_unregister_netfs(&afs_cache_netfs);
 177 #endif
 178         afs_proc_cleanup();
 179         rcu_barrier();
 180 }
 181
 182 module_exit(afs_exit);