1 files changed, 286 insertions, 0 deletions

diff --git a/fs/afs/main.c b/fs/afs/main.c
new file mode 100644
index 000000000000..913c689bdb35
--- /dev/null
+++ b/fs/afs/main.c
@@ -0,0 +1,286 @@
+/* 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