linux/fs/afs/main.c
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   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
  19MODULE_DESCRIPTION("AFS Client File System");
  20MODULE_AUTHOR("Red Hat, Inc.");
  21MODULE_LICENSE("GPL");
  22
  23unsigned afs_debug;
  24module_param_named(debug, afs_debug, uint, S_IWUSR | S_IRUGO);
  25MODULE_PARM_DESC(debug, "AFS debugging mask");
  26
  27static char *rootcell;
  28
  29module_param(rootcell, charp, 0);
  30MODULE_PARM_DESC(rootcell, "root AFS cell name and VL server IP addr list");
  31
  32struct afs_uuid afs_uuid;
  33struct workqueue_struct *afs_wq;
  34
  35/*
  36 * get a client UUID
  37 */
  38static 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 */
  81static 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
 136error_fs:
 137        afs_close_socket();
 138error_open_socket:
 139        afs_callback_update_kill();
 140error_callback_update_init:
 141        afs_vlocation_purge();
 142error_vl_update_init:
 143        afs_cell_purge();
 144error_cell_init:
 145#ifdef CONFIG_AFS_FSCACHE
 146        fscache_unregister_netfs(&afs_cache_netfs);
 147error_cache:
 148#endif
 149        afs_proc_cleanup();
 150error_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 */
 160late_initcall(afs_init);        /* must be called after net/ to create socket */
 161
 162/*
 163 * clean up on module removal
 164 */
 165static 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
 184module_exit(afs_exit);
 185
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