LXR linux/fs/afs/main.c

   1/* AFS client file system
   2 *
   3 * Copyright (C) 2002 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
  32#ifdef AFS_CACHING_SUPPORT
  33static struct cachefs_netfs_operations afs_cache_ops = {
  34        .get_page_cookie        = afs_cache_get_page_cookie,
  35};
  36
  37struct cachefs_netfs afs_cache_netfs = {
  38        .name                   = "afs",
  39        .version                = 0,
  40        .ops                    = &afs_cache_ops,
  41};
  42#endif
  43
  44struct afs_uuid afs_uuid;
  45
  46/*
  47 * get a client UUID
  48 */
  49static int __init afs_get_client_UUID(void)
  50{
  51        struct timespec ts;
  52        u64 uuidtime;
  53        u16 clockseq;
  54        int ret;
  55
  56        /* read the MAC address of one of the external interfaces and construct
  57         * a UUID from it */
  58        ret = afs_get_MAC_address(afs_uuid.node, sizeof(afs_uuid.node));
  59        if (ret < 0)
  60                return ret;
  61
  62        getnstimeofday(&ts);
  63        uuidtime = (u64) ts.tv_sec * 1000 * 1000 * 10;
  64        uuidtime += ts.tv_nsec / 100;
  65        uuidtime += AFS_UUID_TO_UNIX_TIME;
  66        afs_uuid.time_low = uuidtime;
  67        afs_uuid.time_mid = uuidtime >> 32;
  68        afs_uuid.time_hi_and_version = (uuidtime >> 48) & AFS_UUID_TIMEHI_MASK;
  69        afs_uuid.time_hi_and_version = AFS_UUID_VERSION_TIME;
  70
  71        get_random_bytes(&clockseq, 2);
  72        afs_uuid.clock_seq_low = clockseq;
  73        afs_uuid.clock_seq_hi_and_reserved =
  74                (clockseq >> 8) & AFS_UUID_CLOCKHI_MASK;
  75        afs_uuid.clock_seq_hi_and_reserved = AFS_UUID_VARIANT_STD;
  76
  77        _debug("AFS UUID: %08x-%04x-%04x-%02x%02x-%02x%02x%02x%02x%02x%02x",
  78               afs_uuid.time_low,
  79               afs_uuid.time_mid,
  80               afs_uuid.time_hi_and_version,
  81               afs_uuid.clock_seq_hi_and_reserved,
  82               afs_uuid.clock_seq_low,
  83               afs_uuid.node[0], afs_uuid.node[1], afs_uuid.node[2],
  84               afs_uuid.node[3], afs_uuid.node[4], afs_uuid.node[5]);
  85
  86        return 0;
  87}
  88
  89/*
  90 * initialise the AFS client FS module
  91 */
  92static int __init afs_init(void)
  93{
  94        int ret;
  95
  96        printk(KERN_INFO "kAFS: Red Hat AFS client v0.1 registering.\n");
  97
  98        ret = afs_get_client_UUID();
  99        if (ret < 0)
 100                return ret;
 101
 102        /* register the /proc stuff */
 103        ret = afs_proc_init();
 104        if (ret < 0)
 105                return ret;
 106
 107#ifdef AFS_CACHING_SUPPORT
 108        /* we want to be able to cache */
 109        ret = cachefs_register_netfs(&afs_cache_netfs,
 110                                     &afs_cache_cell_index_def);
 111        if (ret < 0)
 112                goto error_cache;
 113#endif
 114
 115        /* initialise the cell DB */
 116        ret = afs_cell_init(rootcell);
 117        if (ret < 0)
 118                goto error_cell_init;
 119
 120        /* initialise the VL update process */
 121        ret = afs_vlocation_update_init();
 122        if (ret < 0)
 123                goto error_vl_update_init;
 124
 125        /* initialise the callback update process */
 126        ret = afs_callback_update_init();
 127
 128        /* create the RxRPC transport */
 129        ret = afs_open_socket();
 130        if (ret < 0)
 131                goto error_open_socket;
 132
 133        /* register the filesystems */
 134        ret = afs_fs_init();
 135        if (ret < 0)
 136                goto error_fs;
 137
 138        return ret;
 139
 140error_fs:
 141        afs_close_socket();
 142error_open_socket:
 143error_vl_update_init:
 144error_cell_init:
 145#ifdef AFS_CACHING_SUPPORT
 146        cachefs_unregister_netfs(&afs_cache_netfs);
 147error_cache:
 148#endif
 149        afs_callback_update_kill();
 150        afs_vlocation_purge();
 151        afs_cell_purge();
 152        afs_proc_cleanup();
 153        rcu_barrier();
 154        printk(KERN_ERR "kAFS: failed to register: %d\n", ret);
 155        return ret;
 156}
 157
 158/* XXX late_initcall is kludgy, but the only alternative seems to create
 159 * a transport upon the first mount, which is worse. Or is it?
 160 */
 161late_initcall(afs_init);        /* must be called after net/ to create socket */
 162
 163/*
 164 * clean up on module removal
 165 */
 166static void __exit afs_exit(void)
 167{
 168        printk(KERN_INFO "kAFS: Red Hat AFS client v0.1 unregistering.\n");
 169
 170        afs_fs_exit();
 171        afs_kill_lock_manager();
 172        afs_close_socket();
 173        afs_purge_servers();
 174        afs_callback_update_kill();
 175        afs_vlocation_purge();
 176        flush_scheduled_work();
 177        afs_cell_purge();
 178#ifdef AFS_CACHING_SUPPORT
 179        cachefs_unregister_netfs(&afs_cache_netfs);
 180#endif
 181        afs_proc_cleanup();
 182        rcu_barrier();
 183}
 184
 185module_exit(afs_exit);
 186