1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
4 * Lustre Light Super operations
6 * Copyright (c) 2002, 2003 Cluster File Systems, Inc.
8 * This file is part of Lustre, http://www.lustre.org.
10 * Lustre is free software; you can redistribute it and/or
11 * modify it under the terms of version 2 of the GNU General Public
12 * License as published by the Free Software Foundation.
14 * Lustre is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with Lustre; if not, write to the Free Software
21 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 #define DEBUG_SUBSYSTEM S_LLITE
26 #include <linux/module.h>
27 #include <linux/types.h>
28 #include <linux/random.h>
29 #include <linux/version.h>
30 #include <lustre_lite.h>
31 #include <lustre_ha.h>
32 #include <lustre_dlm.h>
33 #include <linux/init.h>
35 #include <lprocfs_status.h>
36 #include "llite_internal.h"
38 static kmem_cache_t *ll_inode_cachep;
40 static struct inode *ll_alloc_inode(struct super_block *sb)
42 struct ll_inode_info *lli;
43 lprocfs_counter_incr((ll_s2sbi(sb))->ll_stats, LPROC_LL_ALLOC_INODE);
44 OBD_SLAB_ALLOC(lli, ll_inode_cachep, SLAB_KERNEL, sizeof *lli);
48 inode_init_once(&lli->lli_vfs_inode);
51 return &lli->lli_vfs_inode;
54 static void ll_destroy_inode(struct inode *inode)
56 struct ll_inode_info *ptr = ll_i2info(inode);
57 OBD_SLAB_FREE(ptr, ll_inode_cachep, sizeof(*ptr));
60 static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags)
62 struct ll_inode_info *lli = foo;
64 if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
65 SLAB_CTOR_CONSTRUCTOR)
66 inode_init_once(&lli->lli_vfs_inode);
69 int ll_init_inodecache(void)
71 ll_inode_cachep = kmem_cache_create("lustre_inode_cache",
72 sizeof(struct ll_inode_info),
73 0, SLAB_HWCACHE_ALIGN,
75 if (ll_inode_cachep == NULL)
80 void ll_destroy_inodecache(void)
82 #ifdef HAVE_KMEM_CACHE_DESTROY_INT
85 rc = kmem_cache_destroy(ll_inode_cachep);
86 LASSERTF(rc == 0, "ll_inode_cache: not all structures were freed\n");
88 kmem_cache_destroy(ll_inode_cachep);
92 /* exported operations */
93 struct super_operations lustre_super_operations =
95 .alloc_inode = ll_alloc_inode,
96 .destroy_inode = ll_destroy_inode,
97 .clear_inode = ll_clear_inode,
98 .put_super = ll_put_super,
100 .umount_begin = ll_umount_begin,
101 .remount_fs = ll_remount_fs,
105 void lustre_register_client_process_config(int (*cpc)(struct lustre_cfg *lcfg));
107 static int __init init_lustre_lite(void)
111 lnet_process_id_t lnet_id;
113 printk(KERN_INFO "Lustre: Lustre Client File System; "
114 "info@clusterfs.com\n");
115 rc = ll_init_inodecache();
118 ll_file_data_slab = kmem_cache_create("ll_file_data",
119 sizeof(struct ll_file_data), 0,
120 SLAB_HWCACHE_ALIGN, NULL, NULL);
121 if (ll_file_data_slab == NULL) {
122 ll_destroy_inodecache();
126 proc_lustre_fs_root = proc_lustre_root ?
127 proc_mkdir("llite", proc_lustre_root) : NULL;
129 ll_register_cache(&ll_cache_definition);
131 lustre_register_client_fill_super(ll_fill_super);
132 lustre_register_client_process_config(ll_process_config);
134 get_random_bytes(seed, sizeof(seed));
136 /* Nodes with small feet have little entropy
137 * the NID for this node gives the most entropy in the low bits */
139 if (LNetGetId(i, &lnet_id) == -ENOENT) {
142 if (LNET_NETTYP(LNET_NIDNET(lnet_id.nid)) != LOLND) {
143 seed[0] ^= LNET_NIDADDR(lnet_id.nid);
147 do_gettimeofday(&tv);
148 ll_srand(tv.tv_sec ^ seed[0], tv.tv_usec ^ seed[1]);
153 static void __exit exit_lustre_lite(void)
155 #ifdef HAVE_KMEM_CACHE_DESTROY_INT
159 lustre_register_client_fill_super(NULL);
160 lustre_register_client_process_config(NULL);
162 ll_unregister_cache(&ll_cache_definition);
164 ll_destroy_inodecache();
165 #ifdef HAVE_KMEM_CACHE_DESTROY_INT
166 rc = kmem_cache_destroy(ll_file_data_slab);
167 LASSERTF(rc == 0, "couldn't destroy ll_file_data slab\n");
169 kmem_cache_destroy(ll_file_data_slab);
171 if (ll_async_page_slab) {
172 #ifdef HAVE_KMEM_CACHE_DESTROY_INT
173 rc = kmem_cache_destroy(ll_async_page_slab);
174 LASSERTF(rc == 0, "couldn't destroy ll_async_page slab\n");
176 kmem_cache_destroy(ll_async_page_slab);
180 if (proc_lustre_fs_root)
181 lprocfs_remove(&proc_lustre_fs_root);
184 MODULE_AUTHOR("Cluster File Systems, Inc. <info@clusterfs.com>");
185 MODULE_DESCRIPTION("Lustre Lite Client File System");
186 MODULE_LICENSE("GPL");
188 module_init(init_lustre_lite);
189 module_exit(exit_lustre_lite);