11da177e4SLinus Torvalds /* main.c: AFS client file system 21da177e4SLinus Torvalds * 31da177e4SLinus Torvalds * Copyright (C) 2002 Red Hat, Inc. All Rights Reserved. 41da177e4SLinus Torvalds * Written by David Howells (dhowells@redhat.com) 51da177e4SLinus Torvalds * 61da177e4SLinus Torvalds * This program is free software; you can redistribute it and/or 71da177e4SLinus Torvalds * modify it under the terms of the GNU General Public License 81da177e4SLinus Torvalds * as published by the Free Software Foundation; either version 91da177e4SLinus Torvalds * 2 of the License, or (at your option) any later version. 101da177e4SLinus Torvalds */ 111da177e4SLinus Torvalds 121da177e4SLinus Torvalds #include <linux/module.h> 131da177e4SLinus Torvalds #include <linux/moduleparam.h> 141da177e4SLinus Torvalds #include <linux/init.h> 151da177e4SLinus Torvalds #include <linux/sched.h> 161da177e4SLinus Torvalds #include <linux/completion.h> 171da177e4SLinus Torvalds #include <rxrpc/rxrpc.h> 181da177e4SLinus Torvalds #include <rxrpc/transport.h> 191da177e4SLinus Torvalds #include <rxrpc/call.h> 201da177e4SLinus Torvalds #include <rxrpc/peer.h> 211da177e4SLinus Torvalds #include "cache.h" 221da177e4SLinus Torvalds #include "cell.h" 231da177e4SLinus Torvalds #include "server.h" 241da177e4SLinus Torvalds #include "fsclient.h" 251da177e4SLinus Torvalds #include "cmservice.h" 261da177e4SLinus Torvalds #include "kafstimod.h" 271da177e4SLinus Torvalds #include "kafsasyncd.h" 281da177e4SLinus Torvalds #include "internal.h" 291da177e4SLinus Torvalds 301da177e4SLinus Torvalds struct rxrpc_transport *afs_transport; 311da177e4SLinus Torvalds 321da177e4SLinus Torvalds static int afs_adding_peer(struct rxrpc_peer *peer); 331da177e4SLinus Torvalds static void afs_discarding_peer(struct rxrpc_peer *peer); 341da177e4SLinus Torvalds 351da177e4SLinus Torvalds 361da177e4SLinus Torvalds MODULE_DESCRIPTION("AFS Client File System"); 371da177e4SLinus Torvalds MODULE_AUTHOR("Red Hat, Inc."); 381da177e4SLinus Torvalds MODULE_LICENSE("GPL"); 391da177e4SLinus Torvalds 401da177e4SLinus Torvalds static char *rootcell; 411da177e4SLinus Torvalds 421da177e4SLinus Torvalds module_param(rootcell, charp, 0); 431da177e4SLinus Torvalds MODULE_PARM_DESC(rootcell, "root AFS cell name and VL server IP addr list"); 441da177e4SLinus Torvalds 451da177e4SLinus Torvalds 461da177e4SLinus Torvalds static struct rxrpc_peer_ops afs_peer_ops = { 471da177e4SLinus Torvalds .adding = afs_adding_peer, 481da177e4SLinus Torvalds .discarding = afs_discarding_peer, 491da177e4SLinus Torvalds }; 501da177e4SLinus Torvalds 511da177e4SLinus Torvalds struct list_head afs_cb_hash_tbl[AFS_CB_HASH_COUNT]; 521da177e4SLinus Torvalds DEFINE_SPINLOCK(afs_cb_hash_lock); 531da177e4SLinus Torvalds 541da177e4SLinus Torvalds #ifdef AFS_CACHING_SUPPORT 551da177e4SLinus Torvalds static struct cachefs_netfs_operations afs_cache_ops = { 561da177e4SLinus Torvalds .get_page_cookie = afs_cache_get_page_cookie, 571da177e4SLinus Torvalds }; 581da177e4SLinus Torvalds 591da177e4SLinus Torvalds struct cachefs_netfs afs_cache_netfs = { 601da177e4SLinus Torvalds .name = "afs", 611da177e4SLinus Torvalds .version = 0, 621da177e4SLinus Torvalds .ops = &afs_cache_ops, 631da177e4SLinus Torvalds }; 641da177e4SLinus Torvalds #endif 651da177e4SLinus Torvalds 661da177e4SLinus Torvalds /*****************************************************************************/ 671da177e4SLinus Torvalds /* 681da177e4SLinus Torvalds * initialise the AFS client FS module 691da177e4SLinus Torvalds */ 701da177e4SLinus Torvalds static int __init afs_init(void) 711da177e4SLinus Torvalds { 721da177e4SLinus Torvalds int loop, ret; 731da177e4SLinus Torvalds 741da177e4SLinus Torvalds printk(KERN_INFO "kAFS: Red Hat AFS client v0.1 registering.\n"); 751da177e4SLinus Torvalds 761da177e4SLinus Torvalds /* initialise the callback hash table */ 771da177e4SLinus Torvalds spin_lock_init(&afs_cb_hash_lock); 781da177e4SLinus Torvalds for (loop = AFS_CB_HASH_COUNT - 1; loop >= 0; loop--) 791da177e4SLinus Torvalds INIT_LIST_HEAD(&afs_cb_hash_tbl[loop]); 801da177e4SLinus Torvalds 811da177e4SLinus Torvalds /* register the /proc stuff */ 821da177e4SLinus Torvalds ret = afs_proc_init(); 831da177e4SLinus Torvalds if (ret < 0) 841da177e4SLinus Torvalds return ret; 851da177e4SLinus Torvalds 861da177e4SLinus Torvalds #ifdef AFS_CACHING_SUPPORT 871da177e4SLinus Torvalds /* we want to be able to cache */ 881da177e4SLinus Torvalds ret = cachefs_register_netfs(&afs_cache_netfs, 891da177e4SLinus Torvalds &afs_cache_cell_index_def); 901da177e4SLinus Torvalds if (ret < 0) 911da177e4SLinus Torvalds goto error; 921da177e4SLinus Torvalds #endif 931da177e4SLinus Torvalds 941da177e4SLinus Torvalds #ifdef CONFIG_KEYS_TURNED_OFF 951da177e4SLinus Torvalds ret = afs_key_register(); 961da177e4SLinus Torvalds if (ret < 0) 971da177e4SLinus Torvalds goto error_cache; 981da177e4SLinus Torvalds #endif 991da177e4SLinus Torvalds 1001da177e4SLinus Torvalds /* initialise the cell DB */ 1011da177e4SLinus Torvalds ret = afs_cell_init(rootcell); 1021da177e4SLinus Torvalds if (ret < 0) 1031da177e4SLinus Torvalds goto error_keys; 1041da177e4SLinus Torvalds 1051da177e4SLinus Torvalds /* start the timeout daemon */ 1061da177e4SLinus Torvalds ret = afs_kafstimod_start(); 1071da177e4SLinus Torvalds if (ret < 0) 1081da177e4SLinus Torvalds goto error_keys; 1091da177e4SLinus Torvalds 1101da177e4SLinus Torvalds /* start the async operation daemon */ 1111da177e4SLinus Torvalds ret = afs_kafsasyncd_start(); 1121da177e4SLinus Torvalds if (ret < 0) 1131da177e4SLinus Torvalds goto error_kafstimod; 1141da177e4SLinus Torvalds 1151da177e4SLinus Torvalds /* create the RxRPC transport */ 1161da177e4SLinus Torvalds ret = rxrpc_create_transport(7001, &afs_transport); 1171da177e4SLinus Torvalds if (ret < 0) 1181da177e4SLinus Torvalds goto error_kafsasyncd; 1191da177e4SLinus Torvalds 1201da177e4SLinus Torvalds afs_transport->peer_ops = &afs_peer_ops; 1211da177e4SLinus Torvalds 1221da177e4SLinus Torvalds /* register the filesystems */ 1231da177e4SLinus Torvalds ret = afs_fs_init(); 1241da177e4SLinus Torvalds if (ret < 0) 1251da177e4SLinus Torvalds goto error_transport; 1261da177e4SLinus Torvalds 1271da177e4SLinus Torvalds return ret; 1281da177e4SLinus Torvalds 1291da177e4SLinus Torvalds error_transport: 1301da177e4SLinus Torvalds rxrpc_put_transport(afs_transport); 1311da177e4SLinus Torvalds error_kafsasyncd: 1321da177e4SLinus Torvalds afs_kafsasyncd_stop(); 1331da177e4SLinus Torvalds error_kafstimod: 1341da177e4SLinus Torvalds afs_kafstimod_stop(); 1351da177e4SLinus Torvalds error_keys: 1361da177e4SLinus Torvalds #ifdef CONFIG_KEYS_TURNED_OFF 1371da177e4SLinus Torvalds afs_key_unregister(); 1381da177e4SLinus Torvalds error_cache: 1391da177e4SLinus Torvalds #endif 1401da177e4SLinus Torvalds #ifdef AFS_CACHING_SUPPORT 1411da177e4SLinus Torvalds cachefs_unregister_netfs(&afs_cache_netfs); 1421da177e4SLinus Torvalds error: 1431da177e4SLinus Torvalds #endif 1441da177e4SLinus Torvalds afs_cell_purge(); 1451da177e4SLinus Torvalds afs_proc_cleanup(); 1461da177e4SLinus Torvalds printk(KERN_ERR "kAFS: failed to register: %d\n", ret); 1471da177e4SLinus Torvalds return ret; 1481da177e4SLinus Torvalds } /* end afs_init() */ 1491da177e4SLinus Torvalds 1501da177e4SLinus Torvalds /* XXX late_initcall is kludgy, but the only alternative seems to create 1511da177e4SLinus Torvalds * a transport upon the first mount, which is worse. Or is it? 1521da177e4SLinus Torvalds */ 1531da177e4SLinus Torvalds late_initcall(afs_init); /* must be called after net/ to create socket */ 1541da177e4SLinus Torvalds /*****************************************************************************/ 1551da177e4SLinus Torvalds /* 1561da177e4SLinus Torvalds * clean up on module removal 1571da177e4SLinus Torvalds */ 1581da177e4SLinus Torvalds static void __exit afs_exit(void) 1591da177e4SLinus Torvalds { 1601da177e4SLinus Torvalds printk(KERN_INFO "kAFS: Red Hat AFS client v0.1 unregistering.\n"); 1611da177e4SLinus Torvalds 1621da177e4SLinus Torvalds afs_fs_exit(); 1631da177e4SLinus Torvalds rxrpc_put_transport(afs_transport); 1641da177e4SLinus Torvalds afs_kafstimod_stop(); 1651da177e4SLinus Torvalds afs_kafsasyncd_stop(); 1661da177e4SLinus Torvalds afs_cell_purge(); 1671da177e4SLinus Torvalds #ifdef CONFIG_KEYS_TURNED_OFF 1681da177e4SLinus Torvalds afs_key_unregister(); 1691da177e4SLinus Torvalds #endif 1701da177e4SLinus Torvalds #ifdef AFS_CACHING_SUPPORT 1711da177e4SLinus Torvalds cachefs_unregister_netfs(&afs_cache_netfs); 1721da177e4SLinus Torvalds #endif 1731da177e4SLinus Torvalds afs_proc_cleanup(); 1741da177e4SLinus Torvalds 1751da177e4SLinus Torvalds } /* end afs_exit() */ 1761da177e4SLinus Torvalds 1771da177e4SLinus Torvalds module_exit(afs_exit); 1781da177e4SLinus Torvalds 1791da177e4SLinus Torvalds /*****************************************************************************/ 1801da177e4SLinus Torvalds /* 1811da177e4SLinus Torvalds * notification that new peer record is being added 1821da177e4SLinus Torvalds * - called from krxsecd 1831da177e4SLinus Torvalds * - return an error to induce an abort 1841da177e4SLinus Torvalds * - mustn't sleep (caller holds an rwlock) 1851da177e4SLinus Torvalds */ 1861da177e4SLinus Torvalds static int afs_adding_peer(struct rxrpc_peer *peer) 1871da177e4SLinus Torvalds { 1881da177e4SLinus Torvalds struct afs_server *server; 1891da177e4SLinus Torvalds int ret; 1901da177e4SLinus Torvalds 1911da177e4SLinus Torvalds _debug("kAFS: Adding new peer %08x\n", ntohl(peer->addr.s_addr)); 1921da177e4SLinus Torvalds 1931da177e4SLinus Torvalds /* determine which server the peer resides in (if any) */ 1941da177e4SLinus Torvalds ret = afs_server_find_by_peer(peer, &server); 1951da177e4SLinus Torvalds if (ret < 0) 1961da177e4SLinus Torvalds return ret; /* none that we recognise, so abort */ 1971da177e4SLinus Torvalds 1981da177e4SLinus Torvalds _debug("Server %p{u=%d}\n", server, atomic_read(&server->usage)); 1991da177e4SLinus Torvalds 2001da177e4SLinus Torvalds _debug("Cell %p{u=%d}\n", 2011da177e4SLinus Torvalds server->cell, atomic_read(&server->cell->usage)); 2021da177e4SLinus Torvalds 2031da177e4SLinus Torvalds /* cross-point the structs under a global lock */ 2041da177e4SLinus Torvalds spin_lock(&afs_server_peer_lock); 2051da177e4SLinus Torvalds peer->user = server; 2061da177e4SLinus Torvalds server->peer = peer; 2071da177e4SLinus Torvalds spin_unlock(&afs_server_peer_lock); 2081da177e4SLinus Torvalds 2091da177e4SLinus Torvalds afs_put_server(server); 2101da177e4SLinus Torvalds 2111da177e4SLinus Torvalds return 0; 2121da177e4SLinus Torvalds } /* end afs_adding_peer() */ 2131da177e4SLinus Torvalds 2141da177e4SLinus Torvalds /*****************************************************************************/ 2151da177e4SLinus Torvalds /* 2161da177e4SLinus Torvalds * notification that a peer record is being discarded 2171da177e4SLinus Torvalds * - called from krxiod or krxsecd 2181da177e4SLinus Torvalds */ 2191da177e4SLinus Torvalds static void afs_discarding_peer(struct rxrpc_peer *peer) 2201da177e4SLinus Torvalds { 2211da177e4SLinus Torvalds struct afs_server *server; 2221da177e4SLinus Torvalds 2231da177e4SLinus Torvalds _enter("%p",peer); 2241da177e4SLinus Torvalds 2251da177e4SLinus Torvalds _debug("Discarding peer %08x (rtt=%lu.%lumS)\n", 2261da177e4SLinus Torvalds ntohl(peer->addr.s_addr), 2271da177e4SLinus Torvalds (long) (peer->rtt / 1000), 2281da177e4SLinus Torvalds (long) (peer->rtt % 1000)); 2291da177e4SLinus Torvalds 2301da177e4SLinus Torvalds /* uncross-point the structs under a global lock */ 2311da177e4SLinus Torvalds spin_lock(&afs_server_peer_lock); 2321da177e4SLinus Torvalds server = peer->user; 2331da177e4SLinus Torvalds if (server) { 2341da177e4SLinus Torvalds peer->user = NULL; 2351da177e4SLinus Torvalds server->peer = NULL; 2361da177e4SLinus Torvalds } 2371da177e4SLinus Torvalds spin_unlock(&afs_server_peer_lock); 2381da177e4SLinus Torvalds 2391da177e4SLinus Torvalds _leave(""); 2401da177e4SLinus Torvalds 2411da177e4SLinus Torvalds } /* end afs_discarding_peer() */ 2421da177e4SLinus Torvalds 2431da177e4SLinus Torvalds /*****************************************************************************/ 2441da177e4SLinus Torvalds /* 2451da177e4SLinus Torvalds * clear the dead space between task_struct and kernel stack 2461da177e4SLinus Torvalds * - called by supplying -finstrument-functions to gcc 2471da177e4SLinus Torvalds */ 2481da177e4SLinus Torvalds #if 0 2491da177e4SLinus Torvalds void __cyg_profile_func_enter (void *this_fn, void *call_site) 2501da177e4SLinus Torvalds __attribute__((no_instrument_function)); 2511da177e4SLinus Torvalds 2521da177e4SLinus Torvalds void __cyg_profile_func_enter (void *this_fn, void *call_site) 2531da177e4SLinus Torvalds { 2541da177e4SLinus Torvalds asm volatile(" movl %%esp,%%edi \n" 2551da177e4SLinus Torvalds " andl %0,%%edi \n" 2561da177e4SLinus Torvalds " addl %1,%%edi \n" 2571da177e4SLinus Torvalds " movl %%esp,%%ecx \n" 2581da177e4SLinus Torvalds " subl %%edi,%%ecx \n" 2591da177e4SLinus Torvalds " shrl $2,%%ecx \n" 2601da177e4SLinus Torvalds " movl $0xedededed,%%eax \n" 2611da177e4SLinus Torvalds " rep stosl \n" 2621da177e4SLinus Torvalds : 2631da177e4SLinus Torvalds : "i"(~(THREAD_SIZE - 1)), "i"(sizeof(struct thread_info)) 2641da177e4SLinus Torvalds : "eax", "ecx", "edi", "memory", "cc" 2651da177e4SLinus Torvalds ); 2661da177e4SLinus Torvalds } 2671da177e4SLinus Torvalds 2681da177e4SLinus Torvalds void __cyg_profile_func_exit(void *this_fn, void *call_site) 2691da177e4SLinus Torvalds __attribute__((no_instrument_function)); 2701da177e4SLinus Torvalds 2711da177e4SLinus Torvalds void __cyg_profile_func_exit(void *this_fn, void *call_site) 2721da177e4SLinus Torvalds { 2731da177e4SLinus Torvalds asm volatile(" movl %%esp,%%edi \n" 2741da177e4SLinus Torvalds " andl %0,%%edi \n" 2751da177e4SLinus Torvalds " addl %1,%%edi \n" 2761da177e4SLinus Torvalds " movl %%esp,%%ecx \n" 2771da177e4SLinus Torvalds " subl %%edi,%%ecx \n" 2781da177e4SLinus Torvalds " shrl $2,%%ecx \n" 2791da177e4SLinus Torvalds " movl $0xdadadada,%%eax \n" 2801da177e4SLinus Torvalds " rep stosl \n" 2811da177e4SLinus Torvalds : 2821da177e4SLinus Torvalds : "i"(~(THREAD_SIZE - 1)), "i"(sizeof(struct thread_info)) 2831da177e4SLinus Torvalds : "eax", "ecx", "edi", "memory", "cc" 2841da177e4SLinus Torvalds ); 2851da177e4SLinus Torvalds } 2861da177e4SLinus Torvalds #endif 287