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