/* main.c: AFS client file system
*
* Copyright (C) 2002 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (dhowells@redhat.com)
*
* 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/sched.h>
#include <linux/completion.h>
#include <rxrpc/rxrpc.h>
#include <rxrpc/transport.h>
#include <rxrpc/call.h>
#include <rxrpc/peer.h>
#include "cache.h"
#include "cell.h"
#include "server.h"
#include "fsclient.h"
#include "cmservice.h"
#include "kafstimod.h"
#include "kafsasyncd.h"
#include "internal.h"
struct rxrpc_transport *afs_transport;
static int afs_adding_peer(struct rxrpc_peer *peer);
static void afs_discarding_peer(struct rxrpc_peer *peer);
MODULE_DESCRIPTION("AFS Client File System");
MODULE_AUTHOR("Red Hat, Inc.");
MODULE_LICENSE("GPL");
static char *rootcell;
module_param(rootcell, charp, 0);
MODULE_PARM_DESC(rootcell, "root AFS cell name and VL server IP addr list");
static struct rxrpc_peer_ops afs_peer_ops = {
.adding = afs_adding_peer,
.discarding = afs_discarding_peer,
};
struct list_head afs_cb_hash_tbl[AFS_CB_HASH_COUNT];
DEFINE_SPINLOCK(afs_cb_hash_lock);
#ifdef AFS_CACHING_SUPPORT
static struct cachefs_netfs_operations afs_cache_ops = {
.get_page_cookie = afs_cache_get_page_cookie,
};
struct cachefs_netfs afs_cache_netfs = {
.name = "afs",
.version = 0,
.ops = &afs_cache_ops,
};
#endif
/*****************************************************************************/
/*
* initialise the AFS client FS module
*/
static int __init afs_init(void)
{
int loop, ret;
printk(KERN_INFO "kAFS: Red Hat AFS client v0.1 registering.\n");
/* initialise the callback hash table */
spin_lock_init(&afs_cb_hash_lock);
for (loop = AFS_CB_HASH_COUNT - 1; loop >= 0; loop--)
INIT_LIST_HEAD(&afs_cb_hash_tbl[loop]);
/* register the /proc stuff */
ret = afs_proc_init();
if (ret < 0)
return ret;
#ifdef AFS_CACHING_SUPPORT
/* we want to be able to cache */
ret = cachefs_register_netfs(&afs_cache_netfs,
&afs_cache_cell_index_def);
if (ret < 0)
goto error;
#endif
#ifdef CONFIG_KEYS_TURNED_OFF
ret = afs_key_register();
if (ret < 0)
goto error_cache;
#endif
/* initialise the cell DB */
ret = afs_cell_init(rootcell);
if (ret < 0)
goto error_keys;
/* start the timeout daemon */
ret = afs_kafstimod_start();
if (ret < 0)
goto error_keys;
/* start the async operation daemon */
ret = afs_kafsasyncd_start();
if (ret < 0)
goto error_kafstimod;
/* create the RxRPC transport */
ret = rxrpc_create_transport(7001, &afs_transport);
if (ret < 0)
goto error_kafsasyncd;
afs_transport->peer_ops = &afs_peer_ops;
/* register the filesystems */
ret = afs_fs_init();
if (ret < 0)
goto error_transport;
return ret;
error_transport:
rxrpc_put_transport(afs_transport);
error_kafsasyncd:
afs_kafsasyncd_stop();
error_kafstimod:
afs_kafstimod_stop();
error_keys:
#ifdef CONFIG_KEYS_TURNED_OFF
afs_key_unregister();
error_cache:
#endif
#ifdef AFS_CACHING_SUPPORT
cachefs_unregister_netfs(&afs_cache_netfs);
error:
#endif
afs_cell_purge();
afs_proc_cleanup();
printk(KERN_ERR "kAFS: failed to register: %d\n", ret);
return ret;
} /* end afs_init() */
/* 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();
rxrpc_put_transport(afs_transport);
afs_kafstimod_stop();
afs_kafsasyncd_stop();
afs_cell_purge();
#ifdef CONFIG_KEYS_TURNED_OFF
afs_key_unregister();
#endif
#ifdef AFS_CACHING_SUPPORT
cachefs_unregister_netfs(&afs_cache_netfs);
#endif
afs_proc_cleanup();
} /* end afs_exit() */
module_exit(afs_exit);
/*****************************************************************************/
/*
* notification that new peer record is being added
* - called from krxsecd
* - return an error to induce an abort
* - mustn't sleep (caller holds an rwlock)
*/
static int afs_adding_peer(struct rxrpc_peer *peer)
{
struct afs_server *server;
int ret;
_debug("kAFS: Adding new peer %08x\n", ntohl(peer->addr.s_addr));
/* determine which server the peer resides in (if any) */
ret = afs_server_find_by_peer(peer, &server);
if (ret < 0)
return ret; /* none that we recognise, so abort */
_debug("Server %p{u=%d}\n", server, atomic_read(&server->usage));
_debug("Cell %p{u=%d}\n",
server->cell, atomic_read(&server->cell->usage));
/* cross-point the structs under a global lock */
spin_lock(&afs_server_peer_lock);
peer->user = server;
server->peer = peer;
spin_unlock(&afs_server_peer_lock);
afs_put_server(server);
return 0;
} /* end afs_adding_peer() */
/*****************************************************************************/
/*
* notification that a peer record is being discarded
* - called from krxiod or krxsecd
*/
static void afs_discarding_peer(struct rxrpc_peer *peer)
{
struct afs_server *server;
_enter("%p",peer);
_debug("Discarding peer %08x (rtt=%lu.%lumS)\n",
ntohl(peer->addr.s_addr),
(long) (peer->rtt / 1000),
(long) (peer->rtt % 1000));
/* uncross-point the structs under a global lock */
spin_lock(&afs_server_peer_lock);
server = peer->user;
if (server) {
peer->user = NULL;
server->peer = NULL;
}
spin_unlock(&afs_server_peer_lock);
_leave("");
} /* end afs_discarding_peer() */
/*****************************************************************************/
/*
* clear the dead space between task_struct and kernel stack
* - called by supplying -finstrument-functions to gcc
*/
#if 0
void __cyg_profile_func_enter (void *this_fn, void *call_site)
__attribute__((no_instrument_function));
void __cyg_profile_func_enter (void *this_fn, void *call_site)
{
asm volatile(" movl %%esp,%%edi \n"
" andl %0,%%edi \n"
" addl %1,%%edi \n"
" movl %%esp,%%ecx \n"
" subl %%edi,%%ecx \n"
" shrl $2,%%ecx \n"
" movl $0xedededed,%%eax \n"
" rep stosl \n"
:
: "i"(~(THREAD_SIZE - 1)), "i"(sizeof(struct thread_info))
: "eax", "ecx", "edi", "memory", "cc"
);
}
void __cyg_profile_func_exit(void *this_fn, void *call_site)
__attribute__((no_instrument_function));
void __cyg_profile_func_exit(void *this_fn, void *call_site)
{
asm volatile(" movl %%esp,%%edi \n"
" andl %0,%%edi \n"
" addl %1,%%edi \n"
" movl %%esp,%%ecx \n"
" subl %%edi,%%ecx \n"
" shrl $2,%%ecx \n"
" movl $0xdadadada,%%eax \n"
" rep stosl \n"
:
: "i"(~(THREAD_SIZE - 1)), "i"(sizeof(struct thread_info))
: "eax", "ecx", "edi", "memory", "cc"
);
}
#endif
