forked from Minki/linux
a33d62662d
The proc_symlink() function returns NULL on error, it doesn't return
error pointers.
Fixes: 5b86d4ff5d ("afs: Implement network namespacing")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: David Howells <dhowells@redhat.com>
cc: linux-afs@lists.infradead.org
Link: https://lore.kernel.org/r/YLjMRKX40pTrJvgf@mwanda/
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
259 lines
6.3 KiB
C
259 lines
6.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/* AFS client file system
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*
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* Copyright (C) 2002,5 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*/
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/init.h>
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#include <linux/completion.h>
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#include <linux/sched.h>
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#include <linux/random.h>
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#include <linux/proc_fs.h>
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#define CREATE_TRACE_POINTS
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#include "internal.h"
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MODULE_DESCRIPTION("AFS Client File System");
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MODULE_AUTHOR("Red Hat, Inc.");
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MODULE_LICENSE("GPL");
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unsigned afs_debug;
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module_param_named(debug, afs_debug, uint, S_IWUSR | S_IRUGO);
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MODULE_PARM_DESC(debug, "AFS debugging mask");
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static char *rootcell;
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module_param(rootcell, charp, 0);
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MODULE_PARM_DESC(rootcell, "root AFS cell name and VL server IP addr list");
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struct workqueue_struct *afs_wq;
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static struct proc_dir_entry *afs_proc_symlink;
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#if defined(CONFIG_ALPHA)
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const char afs_init_sysname[] = "alpha_linux26";
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#elif defined(CONFIG_X86_64)
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const char afs_init_sysname[] = "amd64_linux26";
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#elif defined(CONFIG_ARM)
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const char afs_init_sysname[] = "arm_linux26";
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#elif defined(CONFIG_ARM64)
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const char afs_init_sysname[] = "aarch64_linux26";
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#elif defined(CONFIG_X86_32)
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const char afs_init_sysname[] = "i386_linux26";
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#elif defined(CONFIG_IA64)
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const char afs_init_sysname[] = "ia64_linux26";
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#elif defined(CONFIG_PPC64)
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const char afs_init_sysname[] = "ppc64_linux26";
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#elif defined(CONFIG_PPC32)
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const char afs_init_sysname[] = "ppc_linux26";
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#elif defined(CONFIG_S390)
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#ifdef CONFIG_64BIT
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const char afs_init_sysname[] = "s390x_linux26";
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#else
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const char afs_init_sysname[] = "s390_linux26";
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#endif
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#elif defined(CONFIG_SPARC64)
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const char afs_init_sysname[] = "sparc64_linux26";
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#elif defined(CONFIG_SPARC32)
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const char afs_init_sysname[] = "sparc_linux26";
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#else
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const char afs_init_sysname[] = "unknown_linux26";
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#endif
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/*
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* Initialise an AFS network namespace record.
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*/
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static int __net_init afs_net_init(struct net *net_ns)
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{
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struct afs_sysnames *sysnames;
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struct afs_net *net = afs_net(net_ns);
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int ret;
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net->net = net_ns;
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net->live = true;
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generate_random_uuid((unsigned char *)&net->uuid);
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INIT_WORK(&net->charge_preallocation_work, afs_charge_preallocation);
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mutex_init(&net->socket_mutex);
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net->cells = RB_ROOT;
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init_rwsem(&net->cells_lock);
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INIT_WORK(&net->cells_manager, afs_manage_cells);
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timer_setup(&net->cells_timer, afs_cells_timer, 0);
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mutex_init(&net->cells_alias_lock);
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mutex_init(&net->proc_cells_lock);
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INIT_HLIST_HEAD(&net->proc_cells);
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seqlock_init(&net->fs_lock);
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net->fs_servers = RB_ROOT;
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INIT_LIST_HEAD(&net->fs_probe_fast);
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INIT_LIST_HEAD(&net->fs_probe_slow);
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INIT_HLIST_HEAD(&net->fs_proc);
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INIT_HLIST_HEAD(&net->fs_addresses4);
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INIT_HLIST_HEAD(&net->fs_addresses6);
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seqlock_init(&net->fs_addr_lock);
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INIT_WORK(&net->fs_manager, afs_manage_servers);
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timer_setup(&net->fs_timer, afs_servers_timer, 0);
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INIT_WORK(&net->fs_prober, afs_fs_probe_dispatcher);
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timer_setup(&net->fs_probe_timer, afs_fs_probe_timer, 0);
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atomic_set(&net->servers_outstanding, 1);
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ret = -ENOMEM;
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sysnames = kzalloc(sizeof(*sysnames), GFP_KERNEL);
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if (!sysnames)
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goto error_sysnames;
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sysnames->subs[0] = (char *)&afs_init_sysname;
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sysnames->nr = 1;
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refcount_set(&sysnames->usage, 1);
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net->sysnames = sysnames;
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rwlock_init(&net->sysnames_lock);
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/* Register the /proc stuff */
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ret = afs_proc_init(net);
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if (ret < 0)
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goto error_proc;
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/* Initialise the cell DB */
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ret = afs_cell_init(net, rootcell);
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if (ret < 0)
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goto error_cell_init;
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/* Create the RxRPC transport */
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ret = afs_open_socket(net);
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if (ret < 0)
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goto error_open_socket;
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return 0;
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error_open_socket:
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net->live = false;
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afs_fs_probe_cleanup(net);
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afs_cell_purge(net);
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afs_purge_servers(net);
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error_cell_init:
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net->live = false;
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afs_proc_cleanup(net);
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error_proc:
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afs_put_sysnames(net->sysnames);
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error_sysnames:
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net->live = false;
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return ret;
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}
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/*
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* Clean up and destroy an AFS network namespace record.
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*/
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static void __net_exit afs_net_exit(struct net *net_ns)
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{
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struct afs_net *net = afs_net(net_ns);
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net->live = false;
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afs_fs_probe_cleanup(net);
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afs_cell_purge(net);
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afs_purge_servers(net);
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afs_close_socket(net);
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afs_proc_cleanup(net);
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afs_put_sysnames(net->sysnames);
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}
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static struct pernet_operations afs_net_ops = {
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.init = afs_net_init,
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.exit = afs_net_exit,
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.id = &afs_net_id,
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.size = sizeof(struct afs_net),
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};
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/*
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* initialise the AFS client FS module
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*/
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static int __init afs_init(void)
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{
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int ret = -ENOMEM;
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printk(KERN_INFO "kAFS: Red Hat AFS client v0.1 registering.\n");
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afs_wq = alloc_workqueue("afs", 0, 0);
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if (!afs_wq)
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goto error_afs_wq;
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afs_async_calls = alloc_workqueue("kafsd", WQ_MEM_RECLAIM, 0);
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if (!afs_async_calls)
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goto error_async;
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afs_lock_manager = alloc_workqueue("kafs_lockd", WQ_MEM_RECLAIM, 0);
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if (!afs_lock_manager)
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goto error_lockmgr;
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#ifdef CONFIG_AFS_FSCACHE
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/* we want to be able to cache */
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ret = fscache_register_netfs(&afs_cache_netfs);
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if (ret < 0)
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goto error_cache;
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#endif
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ret = register_pernet_device(&afs_net_ops);
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if (ret < 0)
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goto error_net;
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/* register the filesystems */
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ret = afs_fs_init();
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if (ret < 0)
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goto error_fs;
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afs_proc_symlink = proc_symlink("fs/afs", NULL, "../self/net/afs");
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if (!afs_proc_symlink) {
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ret = -ENOMEM;
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goto error_proc;
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}
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return ret;
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error_proc:
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afs_fs_exit();
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error_fs:
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unregister_pernet_device(&afs_net_ops);
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error_net:
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#ifdef CONFIG_AFS_FSCACHE
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fscache_unregister_netfs(&afs_cache_netfs);
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error_cache:
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#endif
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destroy_workqueue(afs_lock_manager);
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error_lockmgr:
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destroy_workqueue(afs_async_calls);
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error_async:
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destroy_workqueue(afs_wq);
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error_afs_wq:
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rcu_barrier();
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printk(KERN_ERR "kAFS: failed to register: %d\n", ret);
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return ret;
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}
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/* XXX late_initcall is kludgy, but the only alternative seems to create
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* a transport upon the first mount, which is worse. Or is it?
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*/
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late_initcall(afs_init); /* must be called after net/ to create socket */
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/*
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* clean up on module removal
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*/
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static void __exit afs_exit(void)
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{
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printk(KERN_INFO "kAFS: Red Hat AFS client v0.1 unregistering.\n");
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proc_remove(afs_proc_symlink);
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afs_fs_exit();
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unregister_pernet_device(&afs_net_ops);
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#ifdef CONFIG_AFS_FSCACHE
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fscache_unregister_netfs(&afs_cache_netfs);
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#endif
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destroy_workqueue(afs_lock_manager);
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destroy_workqueue(afs_async_calls);
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destroy_workqueue(afs_wq);
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afs_clean_up_permit_cache();
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rcu_barrier();
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}
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module_exit(afs_exit);
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