aboutsummaryrefslogtreecommitdiff
path: root/fs/afs/main.c
diff options
context:
space:
mode:
Diffstat (limited to 'fs/afs/main.c')
-rw-r--r--fs/afs/main.c286
1 files changed, 286 insertions, 0 deletions
diff --git a/fs/afs/main.c b/fs/afs/main.c
new file mode 100644
index 00000000000..913c689bdb3
--- /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
generated by cgit v1.2.3-18-g5258 (git 2.32.0) at 2024-11-24 09:41:06 +0000