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/random.h>
28 #include <linux/version.h>
29 #include <linux/lustre_lite.h>
30 #include <linux/lustre_ha.h>
31 #include <linux/lustre_dlm.h>
32 #include <linux/init.h>
34 #include <linux/lprocfs_status.h>
35 #include "llite_internal.h"
37 struct super_block * ll_get_sb(struct file_system_type *fs_type,
38 int flags, const char *devname, void * data)
40 /* calls back in fill super */
41 return get_sb_nodev(fs_type, flags, data, ll_fill_super);
44 struct super_block * lustre_get_sb(struct file_system_type *fs_type,
45 int flags, const char *devname, void * data)
47 /* calls back in fill super */
48 return get_sb_nodev(fs_type, flags, data, lustre_fill_super);
51 static kmem_cache_t *ll_inode_cachep;
53 static struct inode *ll_alloc_inode(struct super_block *sb)
55 struct ll_inode_info *lli;
56 lprocfs_counter_incr((ll_s2sbi(sb))->ll_stats, LPROC_LL_ALLOC_INODE);
57 OBD_SLAB_ALLOC(lli, ll_inode_cachep, SLAB_KERNEL, sizeof *lli);
61 inode_init_once(&lli->lli_vfs_inode);
64 return &lli->lli_vfs_inode;
67 static void ll_destroy_inode(struct inode *inode)
69 struct ll_inode_info *ptr = ll_i2info(inode);
70 OBD_SLAB_FREE(ptr, ll_inode_cachep, sizeof(*ptr));
73 static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags)
75 struct ll_inode_info *lli = foo;
77 if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
78 SLAB_CTOR_CONSTRUCTOR)
79 inode_init_once(&lli->lli_vfs_inode);
82 int ll_init_inodecache(void)
84 ll_inode_cachep = kmem_cache_create("lustre_inode_cache",
85 sizeof(struct ll_inode_info),
86 0, SLAB_HWCACHE_ALIGN,
88 if (ll_inode_cachep == NULL)
93 void ll_destroy_inodecache(void)
95 if (kmem_cache_destroy(ll_inode_cachep))
96 CERROR("ll_inode_cache: not all structures were freed\n");
99 /* exported operations */
100 struct super_operations lustre_super_operations =
102 alloc_inode: ll_alloc_inode,
103 destroy_inode: ll_destroy_inode,
104 clear_inode: ll_clear_inode,
105 put_super: ll_put_super,
107 umount_begin: ll_umount_begin
111 struct file_system_type lustre_lite_fs_type = {
112 .owner = THIS_MODULE,
113 .name = "lustre_lite",
115 .kill_sb = kill_anon_super,
118 struct file_system_type lustre_fs_type = {
119 .owner = THIS_MODULE,
121 .get_sb = lustre_get_sb,
122 .kill_sb = kill_anon_super,
125 static int __init init_lustre_lite(void)
128 printk(KERN_INFO "Lustre: Lustre Lite Client File System; "
129 "info@clusterfs.com\n");
130 rc = ll_init_inodecache();
133 ll_file_data_slab = kmem_cache_create("ll_file_data",
134 sizeof(struct ll_file_data), 0,
135 SLAB_HWCACHE_ALIGN, NULL, NULL);
136 if (ll_file_data_slab == NULL) {
137 ll_destroy_inodecache();
141 proc_lustre_fs_root = proc_lustre_root ?
142 proc_mkdir("llite", proc_lustre_root) : NULL;
144 rc = register_filesystem(&lustre_lite_fs_type);
146 rc = register_filesystem(&lustre_fs_type);
148 unregister_filesystem(&lustre_fs_type);
153 static void __exit exit_lustre_lite(void)
155 unregister_filesystem(&lustre_fs_type);
156 unregister_filesystem(&lustre_lite_fs_type);
157 ll_destroy_inodecache();
158 kmem_cache_destroy(ll_file_data_slab);
159 if (proc_lustre_fs_root) {
160 lprocfs_remove(proc_lustre_fs_root);
161 proc_lustre_fs_root = NULL;
165 MODULE_AUTHOR("Cluster File Systems, Inc. <info@clusterfs.com>");
166 MODULE_DESCRIPTION("Lustre Lite Client File System");
167 MODULE_LICENSE("GPL");
169 module_init(init_lustre_lite);
170 module_exit(exit_lustre_lite);