kernel/drivers/staging/lustre/lustre/llite/super25.c

   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
  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
  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
  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
  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
 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);