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_init(void);
  33 static void afs_exit(void);
  34 static int afs_adding_peer(struct rxrpc_peer *peer);
  35 static void afs_discarding_peer(struct rxrpc_peer *peer);
  36
  37 /* XXX late_initcall is kludgy, but the only alternative seems to create
  38  * a transport upon the first mount, which is worse. Or is it?
  39  */
  40 /* module_init(afs_init); */
  41 late_initcall(afs_init);        /* must be called after net/ to create socket */
  42
  43 module_exit(afs_exit);
  44
  45 MODULE_DESCRIPTION("AFS Client File System");
  46 MODULE_AUTHOR("Red Hat, Inc.");
  47 MODULE_LICENSE("GPL");
  48
  49 static char *rootcell;
  50
  51 module_param(rootcell, charp, 0);
  52 MODULE_PARM_DESC(rootcell, "root AFS cell name and VL server IP addr list");
  53
  54
  55 static struct rxrpc_peer_ops afs_peer_ops = {
  56         .adding         = afs_adding_peer,
  57         .discarding     = afs_discarding_peer,
  58 };
  59
  60 struct list_head afs_cb_hash_tbl[AFS_CB_HASH_COUNT];
  61 spinlock_t afs_cb_hash_lock = SPIN_LOCK_UNLOCKED;
  62
  63 #ifdef AFS_CACHING_SUPPORT
  64 static struct cachefs_netfs_operations afs_cache_ops = {
  65         .get_page_cookie        = afs_cache_get_page_cookie,
  66 };
  67
  68 struct cachefs_netfs afs_cache_netfs = {
  69         .name                   = "afs",
  70         .version                = 0,
  71         .ops                    = &afs_cache_ops,
  72 };
  73 #endif
  74
  75 /*****************************************************************************/
  76 /*
  77  * initialise the AFS client FS module
  78  */
  79 static int afs_init(void)
  80 {
  81         int loop, ret;
  82
  83         printk(KERN_INFO "kAFS: Red Hat AFS client v0.1 registering.\n");
  84
  85         /* initialise the callback hash table */
  86         spin_lock_init(&afs_cb_hash_lock);
  87         for (loop = AFS_CB_HASH_COUNT - 1; loop >= 0; loop--)
  88                 INIT_LIST_HEAD(&afs_cb_hash_tbl[loop]);
  89
  90         /* register the /proc stuff */
  91         ret = afs_proc_init();
  92         if (ret < 0)
  93                 return ret;
  94
  95 #ifdef AFS_CACHING_SUPPORT
  96         /* we want to be able to cache */
  97         ret = cachefs_register_netfs(&afs_cache_netfs,
  98                                      &afs_cache_cell_index_def);
  99         if (ret < 0)
 100                 goto error;
 101 #endif
 102
 103 #ifdef CONFIG_KEYS
 104         ret = afs_key_register();
 105         if (ret < 0)
 106                 goto error_cache;
 107 #endif
 108
 109         /* initialise the cell DB */
 110         ret = afs_cell_init(rootcell);
 111         if (ret < 0)
 112                 goto error_keys;
 113
 114         /* start the timeout daemon */
 115         ret = afs_kafstimod_start();
 116         if (ret < 0)
 117                 goto error_keys;
 118
 119         /* start the async operation daemon */
 120         ret = afs_kafsasyncd_start();
 121         if (ret < 0)
 122                 goto error_kafstimod;
 123
 124         /* create the RxRPC transport */
 125         ret = rxrpc_create_transport(7001, &afs_transport);
 126         if (ret < 0)
 127                 goto error_kafsasyncd;
 128
 129         afs_transport->peer_ops = &afs_peer_ops;
 130
 131         /* register the filesystems */
 132         ret = afs_fs_init();
 133         if (ret < 0)
 134                 goto error_transport;
 135
 136         return ret;
 137
 138  error_transport:
 139         rxrpc_put_transport(afs_transport);
 140  error_kafsasyncd:
 141         afs_kafsasyncd_stop();
 142  error_kafstimod:
 143         afs_kafstimod_stop();
 144  error_keys:
 145 #ifdef CONFIG_KEYS
 146         afs_key_unregister();
 147  error_cache:
 148 #endif
 149 #ifdef AFS_CACHING_SUPPORT
 150         cachefs_unregister_netfs(&afs_cache_netfs);
 151  error:
 152 #endif
 153         afs_cell_purge();
 154         afs_proc_cleanup();
 155         printk(KERN_ERR "kAFS: failed to register: %d\n", ret);
 156         return ret;
 157 } /* end afs_init() */
 158
 159 /*****************************************************************************/
 160 /*
 161  * clean up on module removal
 162  */
 163 static void __exit afs_exit(void)
 164 {
 165         printk(KERN_INFO "kAFS: Red Hat AFS client v0.1 unregistering.\n");
 166
 167         afs_fs_exit();
 168         rxrpc_put_transport(afs_transport);
 169         afs_kafstimod_stop();
 170         afs_kafsasyncd_stop();
 171         afs_cell_purge();
 172 #ifdef CONFIG_KEYS
 173         afs_key_unregister();
 174 #endif
 175 #ifdef AFS_CACHING_SUPPORT
 176         cachefs_unregister_netfs(&afs_cache_netfs);
 177 #endif
 178         afs_proc_cleanup();
 179
 180 } /* end afs_exit() */
 181
 182 /*****************************************************************************/
 183 /*
 184  * notification that new peer record is being added
 185  * - called from krxsecd
 186  * - return an error to induce an abort
 187  * - mustn't sleep (caller holds an rwlock)
 188  */
 189 static int afs_adding_peer(struct rxrpc_peer *peer)
 190 {
 191         struct afs_server *server;
 192         int ret;
 193
 194         _debug("kAFS: Adding new peer %08x\n", ntohl(peer->addr.s_addr));
 195
 196         /* determine which server the peer resides in (if any) */
 197         ret = afs_server_find_by_peer(peer, &server);
 198         if (ret < 0)
 199                 return ret; /* none that we recognise, so abort */
 200
 201         _debug("Server %p{u=%d}\n", server, atomic_read(&server->usage));
 202
 203         _debug("Cell %p{u=%d}\n",
 204                server->cell, atomic_read(&server->cell->usage));
 205
 206         /* cross-point the structs under a global lock */
 207         spin_lock(&afs_server_peer_lock);
 208         peer->user = server;
 209         server->peer = peer;
 210         spin_unlock(&afs_server_peer_lock);
 211
 212         afs_put_server(server);
 213
 214         return 0;
 215 } /* end afs_adding_peer() */
 216
 217 /*****************************************************************************/
 218 /*
 219  * notification that a peer record is being discarded
 220  * - called from krxiod or krxsecd
 221  */
 222 static void afs_discarding_peer(struct rxrpc_peer *peer)
 223 {
 224         struct afs_server *server;
 225
 226         _enter("%p",peer);
 227
 228         _debug("Discarding peer %08x (rtt=%lu.%lumS)\n",
 229                ntohl(peer->addr.s_addr),
 230                (long) (peer->rtt / 1000),
 231                (long) (peer->rtt % 1000));
 232
 233         /* uncross-point the structs under a global lock */
 234         spin_lock(&afs_server_peer_lock);
 235         server = peer->user;
 236         if (server) {
 237                 peer->user = NULL;
 238                 server->peer = NULL;
 239         }
 240         spin_unlock(&afs_server_peer_lock);
 241
 242         _leave("");
 243
 244 } /* end afs_discarding_peer() */
 245
 246 /*****************************************************************************/
 247 /*
 248  * clear the dead space between task_struct and kernel stack
 249  * - called by supplying -finstrument-functions to gcc
 250  */
 251 #if 0
 252 void __cyg_profile_func_enter (void *this_fn, void *call_site)
 253 __attribute__((no_instrument_function));
 254
 255 void __cyg_profile_func_enter (void *this_fn, void *call_site)
 256 {
 257        asm volatile("  movl    %%esp,%%edi     \n"
 258                     "  andl    %0,%%edi        \n"
 259                     "  addl    %1,%%edi        \n"
 260                     "  movl    %%esp,%%ecx     \n"
 261                     "  subl    %%edi,%%ecx     \n"
 262                     "  shrl    $2,%%ecx        \n"
 263                     "  movl    $0xedededed,%%eax     \n"
 264                     "  rep stosl               \n"
 265                     :
 266                     : "i"(~(THREAD_SIZE - 1)), "i"(sizeof(struct thread_info))
 267                     : "eax", "ecx", "edi", "memory", "cc"
 268                     );
 269 }
 270
 271 void __cyg_profile_func_exit(void *this_fn, void *call_site)
 272 __attribute__((no_instrument_function));
 273
 274 void __cyg_profile_func_exit(void *this_fn, void *call_site)
 275 {
 276        asm volatile("  movl    %%esp,%%edi     \n"
 277                     "  andl    %0,%%edi        \n"
 278                     "  addl    %1,%%edi        \n"
 279                     "  movl    %%esp,%%ecx     \n"
 280                     "  subl    %%edi,%%ecx     \n"
 281                     "  shrl    $2,%%ecx        \n"
 282                     "  movl    $0xdadadada,%%eax     \n"
 283                     "  rep stosl               \n"
 284                     :
 285                     : "i"(~(THREAD_SIZE - 1)), "i"(sizeof(struct thread_info))
 286                     : "eax", "ecx", "edi", "memory", "cc"
 287                     );
 288 }
 289 #endif