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_zalloc(ll_inode_cachep, GFP_NOFS);
  57         if (!lli)
  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          */
 104         CDEBUG(D_INFO, "Lustre client module (%p).\n",
 105                &lustre_super_operations);
 106
 107         rc = -ENOMEM;
 108         ll_inode_cachep = kmem_cache_create("lustre_inode_cache",
 109                                             sizeof(struct ll_inode_info),
 110                                             0, SLAB_HWCACHE_ALIGN|SLAB_ACCOUNT,
 111                                             NULL);
 112         if (!ll_inode_cachep)
 113                 goto out_cache;
 114
 115         ll_file_data_slab = kmem_cache_create("ll_file_data",
 116                                               sizeof(struct ll_file_data), 0,
 117                                               SLAB_HWCACHE_ALIGN, NULL);
 118         if (!ll_file_data_slab)
 119                 goto out_cache;
 120
 121         ll_remote_perm_cachep = kmem_cache_create("ll_remote_perm_cache",
 122                                                   sizeof(struct ll_remote_perm),
 123                                                       0, 0, NULL);
 124         if (!ll_remote_perm_cachep)
 125                 goto out_cache;
 126
 127         ll_rmtperm_hash_cachep = kmem_cache_create("ll_rmtperm_hash_cache",
 128                                                    REMOTE_PERM_HASHSIZE *
 129                                                    sizeof(struct list_head),
 130                                                    0, 0, NULL);
 131         if (!ll_rmtperm_hash_cachep)
 132                 goto out_cache;
 133
 134         llite_root = debugfs_create_dir("llite", debugfs_lustre_root);
 135         if (IS_ERR_OR_NULL(llite_root)) {
 136                 rc = llite_root ? PTR_ERR(llite_root) : -ENOMEM;
 137                 llite_root = NULL;
 138                 goto out_cache;
 139         }
 140
 141         llite_kset = kset_create_and_add("llite", NULL, lustre_kobj);
 142         if (!llite_kset) {
 143                 rc = -ENOMEM;
 144                 goto out_debugfs;
 145         }
 146
 147         cfs_get_random_bytes(seed, sizeof(seed));
 148
 149         /* Nodes with small feet have little entropy. The NID for this
 150          * node gives the most entropy in the low bits
 151          */
 152         for (i = 0;; i++) {
 153                 if (LNetGetId(i, &lnet_id) == -ENOENT)
 154                         break;
 155
 156                 if (LNET_NETTYP(LNET_NIDNET(lnet_id.nid)) != LOLND)
 157                         seed[0] ^= LNET_NIDADDR(lnet_id.nid);
 158         }
 159
 160         ktime_get_ts64(&ts);
 161         cfs_srand(ts.tv_sec ^ seed[0], ts.tv_nsec ^ seed[1]);
 162
 163         rc = vvp_global_init();
 164         if (rc != 0)
 165                 goto out_sysfs;
 166
 167         rc = ll_xattr_init();
 168         if (rc != 0)
 169                 goto out_vvp;
 170
 171         lustre_register_client_fill_super(ll_fill_super);
 172         lustre_register_kill_super_cb(ll_kill_super);
 173         lustre_register_client_process_config(ll_process_config);
 174
 175         return 0;
 176
 177 out_vvp:
 178         vvp_global_fini();
 179 out_sysfs:
 180         kset_unregister(llite_kset);
 181 out_debugfs:
 182         debugfs_remove(llite_root);
 183 out_cache:
 184         kmem_cache_destroy(ll_inode_cachep);
 185         kmem_cache_destroy(ll_file_data_slab);
 186         kmem_cache_destroy(ll_remote_perm_cachep);
 187         kmem_cache_destroy(ll_rmtperm_hash_cachep);
 188         return rc;
 189 }
 190
 191 static void __exit exit_lustre_lite(void)
 192 {
 193         lustre_register_client_fill_super(NULL);
 194         lustre_register_kill_super_cb(NULL);
 195         lustre_register_client_process_config(NULL);
 196
 197         debugfs_remove(llite_root);
 198         kset_unregister(llite_kset);
 199
 200         ll_xattr_fini();
 201         vvp_global_fini();
 202
 203         kmem_cache_destroy(ll_inode_cachep);
 204         kmem_cache_destroy(ll_rmtperm_hash_cachep);
 205
 206         kmem_cache_destroy(ll_remote_perm_cachep);
 207
 208         kmem_cache_destroy(ll_file_data_slab);
 209 }
 210
 211 MODULE_AUTHOR("OpenSFS, Inc. <http://www.lustre.org/>");
 212 MODULE_DESCRIPTION("Lustre Lite Client File System");
 213 MODULE_VERSION(LUSTRE_VERSION_STRING);
 214 MODULE_LICENSE("GPL");
 215
 216 module_init(init_lustre_lite);
 217 module_exit(exit_lustre_lite);