1 /*
2 * GPL HEADER START
3 *
4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 only,
8 * as published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License version 2 for more details (a copy is included
14 * in the LICENSE file that accompanied this code).
15 *
16 * You should have received a copy of the GNU General Public License
17 * version 2 along with this program; If not, see
18 * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
19 *
20 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
21 * CA 95054 USA or visit www.sun.com if you need additional information or
22 * have any questions.
23 *
24 * GPL HEADER END
25 */
26 /*
27 * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
28 * Use is subject to license terms.
29 *
30 * Copyright (c) 2011, Intel Corporation.
31 */
32 /*
33 * This file is part of Lustre, http://www.lustre.org/
34 * Lustre is a trademark of Sun Microsystems, Inc.
35 */
36
37 #define DEBUG_SUBSYSTEM S_LLITE
38
39 #include <linux/module.h>
40 #include <linux/types.h>
41 #include "../include/lustre_lite.h"
42 #include "../include/lustre_ha.h"
43 #include "../include/lustre_dlm.h"
44 #include <linux/init.h>
45 #include <linux/fs.h>
46 #include "../include/lprocfs_status.h"
47 #include "llite_internal.h"
48
49 static struct kmem_cache *ll_inode_cachep;
50
ll_alloc_inode(struct super_block * sb)51 static struct inode *ll_alloc_inode(struct super_block *sb)
52 {
53 struct ll_inode_info *lli;
54 ll_stats_ops_tally(ll_s2sbi(sb), LPROC_LL_ALLOC_INODE, 1);
55 OBD_SLAB_ALLOC_PTR_GFP(lli, ll_inode_cachep, GFP_NOFS);
56 if (lli == NULL)
57 return NULL;
58
59 inode_init_once(&lli->lli_vfs_inode);
60 return &lli->lli_vfs_inode;
61 }
62
ll_inode_destroy_callback(struct rcu_head * head)63 static void ll_inode_destroy_callback(struct rcu_head *head)
64 {
65 struct inode *inode = container_of(head, struct inode, i_rcu);
66 struct ll_inode_info *ptr = ll_i2info(inode);
67 OBD_SLAB_FREE_PTR(ptr, ll_inode_cachep);
68 }
69
ll_destroy_inode(struct inode * inode)70 static void ll_destroy_inode(struct inode *inode)
71 {
72 call_rcu(&inode->i_rcu, ll_inode_destroy_callback);
73 }
74
75 /* exported operations */
76 struct super_operations lustre_super_operations = {
77 .alloc_inode = ll_alloc_inode,
78 .destroy_inode = ll_destroy_inode,
79 .evict_inode = ll_delete_inode,
80 .put_super = ll_put_super,
81 .statfs = ll_statfs,
82 .umount_begin = ll_umount_begin,
83 .remount_fs = ll_remount_fs,
84 .show_options = ll_show_options,
85 };
86 MODULE_ALIAS_FS("lustre");
87
88 void lustre_register_client_process_config(int (*cpc)(struct lustre_cfg *lcfg));
89
init_lustre_lite(void)90 static int __init init_lustre_lite(void)
91 {
92 struct proc_dir_entry *entry;
93 lnet_process_id_t lnet_id;
94 struct timeval tv;
95 int i, rc, seed[2];
96
97 CLASSERT(sizeof(LUSTRE_VOLATILE_HDR) == LUSTRE_VOLATILE_HDR_LEN + 1);
98
99 /* print an address of _any_ initialized kernel symbol from this
100 * module, to allow debugging with gdb that doesn't support data
101 * symbols from modules.*/
102 CDEBUG(D_INFO, "Lustre client module (%p).\n",
103 &lustre_super_operations);
104
105 rc = -ENOMEM;
106 ll_inode_cachep = kmem_cache_create("lustre_inode_cache",
107 sizeof(struct ll_inode_info),
108 0, SLAB_HWCACHE_ALIGN, NULL);
109 if (ll_inode_cachep == NULL)
110 goto out_cache;
111
112 ll_file_data_slab = kmem_cache_create("ll_file_data",
113 sizeof(struct ll_file_data), 0,
114 SLAB_HWCACHE_ALIGN, NULL);
115 if (ll_file_data_slab == NULL)
116 goto out_cache;
117
118 ll_remote_perm_cachep = kmem_cache_create("ll_remote_perm_cache",
119 sizeof(struct ll_remote_perm),
120 0, 0, NULL);
121 if (ll_remote_perm_cachep == NULL)
122 goto out_cache;
123
124 ll_rmtperm_hash_cachep = kmem_cache_create("ll_rmtperm_hash_cache",
125 REMOTE_PERM_HASHSIZE *
126 sizeof(struct list_head),
127 0, 0, NULL);
128 if (ll_rmtperm_hash_cachep == NULL)
129 goto out_cache;
130
131 entry = lprocfs_register("llite", proc_lustre_root, NULL, NULL);
132 if (IS_ERR(entry)) {
133 rc = PTR_ERR(entry);
134 CERROR("cannot register '/proc/fs/lustre/llite': rc = %d\n",
135 rc);
136 goto out_cache;
137 }
138
139 proc_lustre_fs_root = entry;
140
141 cfs_get_random_bytes(seed, sizeof(seed));
142
143 /* Nodes with small feet have little entropy. The NID for this
144 * node gives the most entropy in the low bits */
145 for (i = 0;; i++) {
146 if (LNetGetId(i, &lnet_id) == -ENOENT)
147 break;
148
149 if (LNET_NETTYP(LNET_NIDNET(lnet_id.nid)) != LOLND)
150 seed[0] ^= LNET_NIDADDR(lnet_id.nid);
151 }
152
153 do_gettimeofday(&tv);
154 cfs_srand(tv.tv_sec ^ seed[0], tv.tv_usec ^ seed[1]);
155 setup_timer(&ll_capa_timer, ll_capa_timer_callback, 0);
156 rc = ll_capa_thread_start();
157 if (rc != 0)
158 goto out_proc;
159
160 rc = vvp_global_init();
161 if (rc != 0)
162 goto out_capa;
163
164 rc = ll_xattr_init();
165 if (rc != 0)
166 goto out_vvp;
167
168 lustre_register_client_fill_super(ll_fill_super);
169 lustre_register_kill_super_cb(ll_kill_super);
170 lustre_register_client_process_config(ll_process_config);
171
172 return 0;
173
174 out_vvp:
175 vvp_global_fini();
176 out_capa:
177 del_timer(&ll_capa_timer);
178 ll_capa_thread_stop();
179 out_proc:
180 lprocfs_remove(&proc_lustre_fs_root);
181 out_cache:
182 if (ll_inode_cachep != NULL)
183 kmem_cache_destroy(ll_inode_cachep);
184
185 if (ll_file_data_slab != NULL)
186 kmem_cache_destroy(ll_file_data_slab);
187
188 if (ll_remote_perm_cachep != NULL)
189 kmem_cache_destroy(ll_remote_perm_cachep);
190
191 if (ll_rmtperm_hash_cachep != NULL)
192 kmem_cache_destroy(ll_rmtperm_hash_cachep);
193
194 return rc;
195 }
196
exit_lustre_lite(void)197 static void __exit exit_lustre_lite(void)
198 {
199 lustre_register_client_fill_super(NULL);
200 lustre_register_kill_super_cb(NULL);
201 lustre_register_client_process_config(NULL);
202
203 lprocfs_remove(&proc_lustre_fs_root);
204
205 ll_xattr_fini();
206 vvp_global_fini();
207 del_timer(&ll_capa_timer);
208 ll_capa_thread_stop();
209 LASSERTF(capa_count[CAPA_SITE_CLIENT] == 0,
210 "client remaining capa count %d\n",
211 capa_count[CAPA_SITE_CLIENT]);
212
213 kmem_cache_destroy(ll_inode_cachep);
214 kmem_cache_destroy(ll_rmtperm_hash_cachep);
215
216 kmem_cache_destroy(ll_remote_perm_cachep);
217
218 kmem_cache_destroy(ll_file_data_slab);
219 }
220
221 MODULE_AUTHOR("Sun Microsystems, Inc. <http://www.lustre.org/>");
222 MODULE_DESCRIPTION("Lustre Lite Client File System");
223 MODULE_LICENSE("GPL");
224
225 module_init(init_lustre_lite);
226 module_exit(exit_lustre_lite);
227