fs/afs/main.c

   1 /* main.c: AFS client file system
   2  *
   3  * Copyright (C) 2002 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/sched.h>
  16 #include <linux/completion.h>
  17 #include <rxrpc/rxrpc.h>
  18 #include <rxrpc/transport.h>
  19 #include <rxrpc/call.h>
  20 #include <rxrpc/peer.h>
  21 #include "cache.h"
  22 #include "cell.h"
  23 #include "server.h"
  24 #include "fsclient.h"
  25 #include "cmservice.h"
  26 #include "kafstimod.h"
  27 #include "kafsasyncd.h"
  28 #include "internal.h"
  29
  30 struct rxrpc_transport *afs_transport;
  31
  32 static int afs_adding_peer(struct rxrpc_peer *peer);
  33 static void afs_discarding_peer(struct rxrpc_peer *peer);
  34
  35
  36 MODULE_DESCRIPTION("AFS Client File System");
  37 MODULE_AUTHOR("Red Hat, Inc.");
  38 MODULE_LICENSE("GPL");
  39
  40 static char *rootcell;
  41
  42 module_param(rootcell, charp, 0);
  43 MODULE_PARM_DESC(rootcell, "root AFS cell name and VL server IP addr list");
  44
  45
  46 static struct rxrpc_peer_ops afs_peer_ops = {
  47         .adding         = afs_adding_peer,
  48         .discarding     = afs_discarding_peer,
  49 };
  50
  51 struct list_head afs_cb_hash_tbl[AFS_CB_HASH_COUNT];
  52 DEFINE_SPINLOCK(afs_cb_hash_lock);
  53
  54 #ifdef AFS_CACHING_SUPPORT
  55 static struct cachefs_netfs_operations afs_cache_ops = {
  56         .get_page_cookie        = afs_cache_get_page_cookie,
  57 };
  58
  59 struct cachefs_netfs afs_cache_netfs = {
  60         .name                   = "afs",
  61         .version                = 0,
  62         .ops                    = &afs_cache_ops,
  63 };
  64 #endif
  65
  66 /*****************************************************************************/
  67 /*
  68  * initialise the AFS client FS module
  69  */
  70 static int __init afs_init(void)
  71 {
  72         int loop, ret;
  73
  74         printk(KERN_INFO "kAFS: Red Hat AFS client v0.1 registering.\n");
  75
  76         /* initialise the callback hash table */
  77         spin_lock_init(&afs_cb_hash_lock);
  78         for (loop = AFS_CB_HASH_COUNT - 1; loop >= 0; loop--)
  79                 INIT_LIST_HEAD(&afs_cb_hash_tbl[loop]);
  80
  81         /* register the /proc stuff */
  82         ret = afs_proc_init();
  83         if (ret < 0)
  84                 return ret;
  85
  86 #ifdef AFS_CACHING_SUPPORT
  87         /* we want to be able to cache */
  88         ret = cachefs_register_netfs(&afs_cache_netfs,
  89                                      &afs_cache_cell_index_def);
  90         if (ret < 0)
  91                 goto error;
  92 #endif
  93
  94 #ifdef CONFIG_KEYS_TURNED_OFF
  95         ret = afs_key_register();
  96         if (ret < 0)
  97                 goto error_cache;
  98 #endif
  99
 100         /* initialise the cell DB */
 101         ret = afs_cell_init(rootcell);
 102         if (ret < 0)
 103                 goto error_keys;
 104
 105         /* start the timeout daemon */
 106         ret = afs_kafstimod_start();
 107         if (ret < 0)
 108                 goto error_keys;
 109
 110         /* start the async operation daemon */
 111         ret = afs_kafsasyncd_start();
 112         if (ret < 0)
 113                 goto error_kafstimod;
 114
 115         /* create the RxRPC transport */
 116         ret = rxrpc_create_transport(7001, &afs_transport);
 117         if (ret < 0)
 118                 goto error_kafsasyncd;
 119
 120         afs_transport->peer_ops = &afs_peer_ops;
 121
 122         /* register the filesystems */
 123         ret = afs_fs_init();
 124         if (ret < 0)
 125                 goto error_transport;
 126
 127         return ret;
 128
 129  error_transport:
 130         rxrpc_put_transport(afs_transport);
 131  error_kafsasyncd:
 132         afs_kafsasyncd_stop();
 133  error_kafstimod:
 134         afs_kafstimod_stop();
 135  error_keys:
 136 #ifdef CONFIG_KEYS_TURNED_OFF
 137         afs_key_unregister();
 138  error_cache:
 139 #endif
 140 #ifdef AFS_CACHING_SUPPORT
 141         cachefs_unregister_netfs(&afs_cache_netfs);
 142  error:
 143 #endif
 144         afs_cell_purge();
 145         afs_proc_cleanup();
 146         printk(KERN_ERR "kAFS: failed to register: %d\n", ret);
 147         return ret;
 148 } /* end afs_init() */
 149
 150 /* XXX late_initcall is kludgy, but the only alternative seems to create
 151  * a transport upon the first mount, which is worse. Or is it?
 152  */
 153 late_initcall(afs_init);        /* must be called after net/ to create socket */
 154 /*****************************************************************************/
 155 /*
 156  * clean up on module removal
 157  */
 158 static void __exit afs_exit(void)
 159 {
 160         printk(KERN_INFO "kAFS: Red Hat AFS client v0.1 unregistering.\n");
 161
 162         afs_fs_exit();
 163         rxrpc_put_transport(afs_transport);
 164         afs_kafstimod_stop();
 165         afs_kafsasyncd_stop();
 166         afs_cell_purge();
 167 #ifdef CONFIG_KEYS_TURNED_OFF
 168         afs_key_unregister();
 169 #endif
 170 #ifdef AFS_CACHING_SUPPORT
 171         cachefs_unregister_netfs(&afs_cache_netfs);
 172 #endif
 173         afs_proc_cleanup();
 174
 175 } /* end afs_exit() */
 176
 177 module_exit(afs_exit);
 178
 179 /*****************************************************************************/
 180 /*
 181  * notification that new peer record is being added
 182  * - called from krxsecd
 183  * - return an error to induce an abort
 184  * - mustn't sleep (caller holds an rwlock)
 185  */
 186 static int afs_adding_peer(struct rxrpc_peer *peer)
 187 {
 188         struct afs_server *server;
 189         int ret;
 190
 191         _debug("kAFS: Adding new peer %08x\n", ntohl(peer->addr.s_addr));
 192
 193         /* determine which server the peer resides in (if any) */
 194         ret = afs_server_find_by_peer(peer, &server);
 195         if (ret < 0)
 196                 return ret; /* none that we recognise, so abort */
 197
 198         _debug("Server %p{u=%d}\n", server, atomic_read(&server->usage));
 199
 200         _debug("Cell %p{u=%d}\n",
 201                server->cell, atomic_read(&server->cell->usage));
 202
 203         /* cross-point the structs under a global lock */
 204         spin_lock(&afs_server_peer_lock);
 205         peer->user = server;
 206         server->peer = peer;
 207         spin_unlock(&afs_server_peer_lock);
 208
 209         afs_put_server(server);
 210
 211         return 0;
 212 } /* end afs_adding_peer() */
 213
 214 /*****************************************************************************/
 215 /*
 216  * notification that a peer record is being discarded
 217  * - called from krxiod or krxsecd
 218  */
 219 static void afs_discarding_peer(struct rxrpc_peer *peer)
 220 {
 221         struct afs_server *server;
 222
 223         _enter("%p",peer);
 224
 225         _debug("Discarding peer %08x (rtt=%lu.%lumS)\n",
 226                ntohl(peer->addr.s_addr),
 227                (long) (peer->rtt / 1000),
 228                (long) (peer->rtt % 1000));
 229
 230         /* uncross-point the structs under a global lock */
 231         spin_lock(&afs_server_peer_lock);
 232         server = peer->user;
 233         if (server) {
 234                 peer->user = NULL;
 235                 server->peer = NULL;
 236         }
 237         spin_unlock(&afs_server_peer_lock);
 238
 239         _leave("");
 240
 241 } /* end afs_discarding_peer() */
 242
 243 /*****************************************************************************/
 244 /*
 245  * clear the dead space between task_struct and kernel stack
 246  * - called by supplying -finstrument-functions to gcc
 247  */
 248 #if 0
 249 void __cyg_profile_func_enter (void *this_fn, void *call_site)
 250 __attribute__((no_instrument_function));
 251
 252 void __cyg_profile_func_enter (void *this_fn, void *call_site)
 253 {
 254        asm volatile("  movl    %%esp,%%edi     \n"
 255                     "  andl    %0,%%edi        \n"
 256                     "  addl    %1,%%edi        \n"
 257                     "  movl    %%esp,%%ecx     \n"
 258                     "  subl    %%edi,%%ecx     \n"
 259                     "  shrl    $2,%%ecx        \n"
 260                     "  movl    $0xedededed,%%eax     \n"
 261                     "  rep stosl               \n"
 262                     :
 263                     : "i"(~(THREAD_SIZE - 1)), "i"(sizeof(struct thread_info))
 264                     : "eax", "ecx", "edi", "memory", "cc"
 265                     );
 266 }
 267
 268 void __cyg_profile_func_exit(void *this_fn, void *call_site)
 269 __attribute__((no_instrument_function));
 270
 271 void __cyg_profile_func_exit(void *this_fn, void *call_site)
 272 {
 273        asm volatile("  movl    %%esp,%%edi     \n"
 274                     "  andl    %0,%%edi        \n"
 275                     "  addl    %1,%%edi        \n"
 276                     "  movl    %%esp,%%ecx     \n"
 277                     "  subl    %%edi,%%ecx     \n"
 278                     "  shrl    $2,%%ecx        \n"
 279                     "  movl    $0xdadadada,%%eax     \n"
 280                     "  rep stosl               \n"
 281                     :
 282                     : "i"(~(THREAD_SIZE - 1)), "i"(sizeof(struct thread_info))
 283                     : "eax", "ecx", "edi", "memory", "cc"
 284                     );
 285 }
 286 #endif