LXR linux/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
  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;
  33
  34/*
  35 * get a client UUID
  36 */
  37static int __init afs_get_client_UUID(void)
  38{
  39        struct timespec ts;
  40        u64 uuidtime;
  41        u16 clockseq;
  42        int ret;
  43
  44        /* read the MAC address of one of the external interfaces and construct
  45         * a UUID from it */
  46        ret = afs_get_MAC_address(afs_uuid.node, sizeof(afs_uuid.node));
  47        if (ret < 0)
  48                return ret;
  49
  50        getnstimeofday(&ts);
  51        uuidtime = (u64) ts.tv_sec * 1000 * 1000 * 10;
  52        uuidtime += ts.tv_nsec / 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 */
  80static 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        /* register the /proc stuff */
  91        ret = afs_proc_init();
  92        if (ret < 0)
  93                return ret;
  94
  95#ifdef CONFIG_AFS_FSCACHE
  96        /* we want to be able to cache */
  97        ret = fscache_register_netfs(&afs_cache_netfs);
  98        if (ret < 0)
  99                goto error_cache;
 100#endif
 101
 102        /* initialise the cell DB */
 103        ret = afs_cell_init(rootcell);
 104        if (ret < 0)
 105                goto error_cell_init;
 106
 107        /* initialise the VL update process */
 108        ret = afs_vlocation_update_init();
 109        if (ret < 0)
 110                goto error_vl_update_init;
 111
 112        /* initialise the callback update process */
 113        ret = afs_callback_update_init();
 114
 115        /* create the RxRPC transport */
 116        ret = afs_open_socket();
 117        if (ret < 0)
 118                goto error_open_socket;
 119
 120        /* register the filesystems */
 121        ret = afs_fs_init();
 122        if (ret < 0)
 123                goto error_fs;
 124
 125        return ret;
 126
 127error_fs:
 128        afs_close_socket();
 129error_open_socket:
 130error_vl_update_init:
 131error_cell_init:
 132#ifdef CONFIG_AFS_FSCACHE
 133        fscache_unregister_netfs(&afs_cache_netfs);
 134error_cache:
 135#endif
 136        afs_callback_update_kill();
 137        afs_vlocation_purge();
 138        afs_cell_purge();
 139        afs_proc_cleanup();
 140        rcu_barrier();
 141        printk(KERN_ERR "kAFS: failed to register: %d\n", ret);
 142        return ret;
 143}
 144
 145/* XXX late_initcall is kludgy, but the only alternative seems to create
 146 * a transport upon the first mount, which is worse. Or is it?
 147 */
 148late_initcall(afs_init);        /* must be called after net/ to create socket */
 149
 150/*
 151 * clean up on module removal
 152 */
 153static void __exit afs_exit(void)
 154{
 155        printk(KERN_INFO "kAFS: Red Hat AFS client v0.1 unregistering.\n");
 156
 157        afs_fs_exit();
 158        afs_kill_lock_manager();
 159        afs_close_socket();
 160        afs_purge_servers();
 161        afs_callback_update_kill();
 162        afs_vlocation_purge();
 163        flush_scheduled_work();
 164        afs_cell_purge();
 165#ifdef CONFIG_AFS_FSCACHE
 166        fscache_unregister_netfs(&afs_cache_netfs);
 167#endif
 168        afs_proc_cleanup();
 169        rcu_barrier();
 170}
 171
 172module_exit(afs_exit);
 173