main.c

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/* AFS client file system
 *
 * Copyright (C) 2002,5 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells ([email protected])
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version
 * 2 of the License, or (at your option) any later version.
 */

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/init.h>
#include <linux/completion.h>
#include <linux/sched.h>
#include "internal.h"

MODULE_DESCRIPTION("AFS Client File System");
MODULE_AUTHOR("Red Hat, Inc.");
MODULE_LICENSE("GPL");

unsigned afs_debug;
module_param_named(debug, afs_debug, uint, S_IWUSR | S_IRUGO);
MODULE_PARM_DESC(debug, "AFS debugging mask");

static char *rootcell;

module_param(rootcell, charp, 0);
MODULE_PARM_DESC(rootcell, "root AFS cell name and VL server IP addr list");

struct afs_uuid afs_uuid;
struct workqueue_struct *afs_wq;

/*
 * get a client UUID
 */
static int __init afs_get_client_UUID(void)
{
    struct timespec ts;
    u64 uuidtime;
    u16 clockseq;
    int ret;

    /* read the MAC address of one of the external interfaces and construct
     * a UUID from it */
    ret = afs_get_MAC_address(afs_uuid.node, sizeof(afs_uuid.node));
    if (ret < 0)
        return ret;

    getnstimeofday(&ts);
    uuidtime = (u64) ts.tv_sec * 1000 * 1000 * 10;
    uuidtime += ts.tv_nsec / 100;
    uuidtime += AFS_UUID_TO_UNIX_TIME;
    afs_uuid.time_low = uuidtime;
    afs_uuid.time_mid = uuidtime >> 32;
    afs_uuid.time_hi_and_version = (uuidtime >> 48) & AFS_UUID_TIMEHI_MASK;
    afs_uuid.time_hi_and_version = AFS_UUID_VERSION_TIME;

    get_random_bytes(&clockseq, 2);
    afs_uuid.clock_seq_low = clockseq;
    afs_uuid.clock_seq_hi_and_reserved =
        (clockseq >> 8) & AFS_UUID_CLOCKHI_MASK;
    afs_uuid.clock_seq_hi_and_reserved = AFS_UUID_VARIANT_STD;

    _debug("AFS UUID: %08x-%04x-%04x-%02x%02x-%02x%02x%02x%02x%02x%02x",
           afs_uuid.time_low,
           afs_uuid.time_mid,
           afs_uuid.time_hi_and_version,
           afs_uuid.clock_seq_hi_and_reserved,
           afs_uuid.clock_seq_low,
           afs_uuid.node[0], afs_uuid.node[1], afs_uuid.node[2],
           afs_uuid.node[3], afs_uuid.node[4], afs_uuid.node[5]);

    return 0;
}

/*
 * initialise the AFS client FS module
 */
static int __init afs_init(void)
{
    int ret;

    printk(KERN_INFO "kAFS: Red Hat AFS client v0.1 registering.\n");

    ret = afs_get_client_UUID();
    if (ret < 0)
        return ret;

    /* create workqueue */
    ret = -ENOMEM;
    afs_wq = alloc_workqueue("afs", 0, 0);
    if (!afs_wq)
        return ret;

    /* register the /proc stuff */
    ret = afs_proc_init();
    if (ret < 0)
        goto error_proc;

#ifdef CONFIG_AFS_FSCACHE
    /* we want to be able to cache */
    ret = fscache_register_netfs(&afs_cache_netfs);
    if (ret < 0)
        goto error_cache;
#endif

    /* initialise the cell DB */
    ret = afs_cell_init(rootcell);
    if (ret < 0)
        goto error_cell_init;

    /* initialise the VL update process */
    ret = afs_vlocation_update_init();
    if (ret < 0)
        goto error_vl_update_init;

    /* initialise the callback update process */
    ret = afs_callback_update_init();
    if (ret < 0)
        goto error_callback_update_init;

    /* create the RxRPC transport */
    ret = afs_open_socket();
    if (ret < 0)
        goto error_open_socket;

    /* register the filesystems */
    ret = afs_fs_init();
    if (ret < 0)
        goto error_fs;

    return ret;

error_fs:
    afs_close_socket();
error_open_socket:
    afs_callback_update_kill();
error_callback_update_init:
    afs_vlocation_purge();
error_vl_update_init:
    afs_cell_purge();
error_cell_init:
#ifdef CONFIG_AFS_FSCACHE
    fscache_unregister_netfs(&afs_cache_netfs);
error_cache:
#endif
    afs_proc_cleanup();
error_proc:
    destroy_workqueue(afs_wq);
    rcu_barrier();
    printk(KERN_ERR "kAFS: failed to register: %d\n", ret);
    return ret;
}

/* XXX late_initcall is kludgy, but the only alternative seems to create
 * a transport upon the first mount, which is worse. Or is it?
 */
late_initcall(afs_init);    /* must be called after net/ to create socket */

/*
 * clean up on module removal
 */
static void __exit afs_exit(void)
{
    printk(KERN_INFO "kAFS: Red Hat AFS client v0.1 unregistering.\n");

    afs_fs_exit();
    afs_kill_lock_manager();
    afs_close_socket();
    afs_purge_servers();
    afs_callback_update_kill();
    afs_vlocation_purge();
    destroy_workqueue(afs_wq);
    afs_cell_purge();
#ifdef CONFIG_AFS_FSCACHE
    fscache_unregister_netfs(&afs_cache_netfs);
#endif
    afs_proc_cleanup();
    rcu_barrier();
}

module_exit(afs_exit);