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
55 ll_stats_ops_tally(ll_s2sbi(sb), LPROC_LL_ALLOC_INODE, 1);
56 lli = kmem_cache_alloc(ll_inode_cachep, GFP_NOFS | __GFP_ZERO);
57 if (lli == NULL)
58 return NULL;
59
60 inode_init_once(&lli->lli_vfs_inode);
61 return &lli->lli_vfs_inode;
62 }
63
ll_inode_destroy_callback(struct rcu_head * head)64 static void ll_inode_destroy_callback(struct rcu_head *head)
65 {
66 struct inode *inode = container_of(head, struct inode, i_rcu);
67 struct ll_inode_info *ptr = ll_i2info(inode);
68
69 kmem_cache_free(ll_inode_cachep, ptr);
70 }
71
ll_destroy_inode(struct inode * inode)72 static void ll_destroy_inode(struct inode *inode)
73 {
74 call_rcu(&inode->i_rcu, ll_inode_destroy_callback);
75 }
76
77 /* exported operations */
78 struct super_operations lustre_super_operations = {
79 .alloc_inode = ll_alloc_inode,
80 .destroy_inode = ll_destroy_inode,
81 .evict_inode = ll_delete_inode,
82 .put_super = ll_put_super,
83 .statfs = ll_statfs,
84 .umount_begin = ll_umount_begin,
85 .remount_fs = ll_remount_fs,
86 .show_options = ll_show_options,
87 };
88 MODULE_ALIAS_FS("lustre");
89
90 void lustre_register_client_process_config(int (*cpc)(struct lustre_cfg *lcfg));
91
init_lustre_lite(void)92 static int __init init_lustre_lite(void)
93 {
94 lnet_process_id_t lnet_id;
95 struct timespec64 ts;
96 int i, rc, seed[2];
97
98 CLASSERT(sizeof(LUSTRE_VOLATILE_HDR) == LUSTRE_VOLATILE_HDR_LEN + 1);
99
100 /* print an address of _any_ initialized kernel symbol from this
101 * module, to allow debugging with gdb that doesn't support data
102 * symbols from modules.*/
103 CDEBUG(D_INFO, "Lustre client module (%p).\n",
104 &lustre_super_operations);
105
106 rc = -ENOMEM;
107 ll_inode_cachep = kmem_cache_create("lustre_inode_cache",
108 sizeof(struct ll_inode_info),
109 0, SLAB_HWCACHE_ALIGN, NULL);
110 if (ll_inode_cachep == NULL)
111 goto out_cache;
112
113 ll_file_data_slab = kmem_cache_create("ll_file_data",
114 sizeof(struct ll_file_data), 0,
115 SLAB_HWCACHE_ALIGN, NULL);
116 if (ll_file_data_slab == NULL)
117 goto out_cache;
118
119 ll_remote_perm_cachep = kmem_cache_create("ll_remote_perm_cache",
120 sizeof(struct ll_remote_perm),
121 0, 0, NULL);
122 if (ll_remote_perm_cachep == NULL)
123 goto out_cache;
124
125 ll_rmtperm_hash_cachep = kmem_cache_create("ll_rmtperm_hash_cache",
126 REMOTE_PERM_HASHSIZE *
127 sizeof(struct list_head),
128 0, 0, NULL);
129 if (ll_rmtperm_hash_cachep == NULL)
130 goto out_cache;
131
132 llite_root = debugfs_create_dir("llite", debugfs_lustre_root);
133 if (IS_ERR_OR_NULL(llite_root)) {
134 rc = llite_root ? PTR_ERR(llite_root) : -ENOMEM;
135 llite_root = NULL;
136 goto out_cache;
137 }
138
139 llite_kset = kset_create_and_add("llite", NULL, lustre_kobj);
140 if (!llite_kset) {
141 rc = -ENOMEM;
142 goto out_debugfs;
143 }
144
145 cfs_get_random_bytes(seed, sizeof(seed));
146
147 /* Nodes with small feet have little entropy. The NID for this
148 * node gives the most entropy in the low bits */
149 for (i = 0;; i++) {
150 if (LNetGetId(i, &lnet_id) == -ENOENT)
151 break;
152
153 if (LNET_NETTYP(LNET_NIDNET(lnet_id.nid)) != LOLND)
154 seed[0] ^= LNET_NIDADDR(lnet_id.nid);
155 }
156
157 ktime_get_ts64(&ts);
158 cfs_srand(ts.tv_sec ^ seed[0], ts.tv_nsec ^ seed[1]);
159
160 rc = vvp_global_init();
161 if (rc != 0)
162 goto out_sysfs;
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_sysfs:
177 kset_unregister(llite_kset);
178 out_debugfs:
179 debugfs_remove(llite_root);
180 out_cache:
181 kmem_cache_destroy(ll_inode_cachep);
182 kmem_cache_destroy(ll_file_data_slab);
183 kmem_cache_destroy(ll_remote_perm_cachep);
184 kmem_cache_destroy(ll_rmtperm_hash_cachep);
185 return rc;
186 }
187
exit_lustre_lite(void)188 static void __exit exit_lustre_lite(void)
189 {
190 lustre_register_client_fill_super(NULL);
191 lustre_register_kill_super_cb(NULL);
192 lustre_register_client_process_config(NULL);
193
194 debugfs_remove(llite_root);
195 kset_unregister(llite_kset);
196
197 ll_xattr_fini();
198 vvp_global_fini();
199
200 kmem_cache_destroy(ll_inode_cachep);
201 kmem_cache_destroy(ll_rmtperm_hash_cachep);
202
203 kmem_cache_destroy(ll_remote_perm_cachep);
204
205 kmem_cache_destroy(ll_file_data_slab);
206 }
207
208 MODULE_AUTHOR("Sun Microsystems, Inc. <http://www.lustre.org/>");
209 MODULE_DESCRIPTION("Lustre Lite Client File System");
210 MODULE_LICENSE("GPL");
211
212 module_init(init_lustre_lite);
213 module_exit(exit_lustre_lite);
214