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 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,0))
39 struct super_block * ll_get_sb(struct file_system_type *fs_type,
40 int flags, const char *devname, void * data)
42 /* calls back in fill super */
43 return get_sb_nodev(fs_type, flags, data, ll_fill_super);
46 static kmem_cache_t *ll_inode_cachep;
48 static struct inode *ll_alloc_inode(struct super_block *sb)
50 struct ll_inode_info *lli;
51 lprocfs_counter_incr((ll_s2sbi(sb))->ll_stats, LPROC_LL_ALLOC_INODE);
52 OBD_SLAB_ALLOC(lli, ll_inode_cachep, SLAB_KERNEL, sizeof *lli);
56 inode_init_once(&lli->lli_vfs_inode);
59 return &lli->lli_vfs_inode;
62 static void ll_destroy_inode(struct inode *inode)
64 struct ll_inode_info *ptr = ll_i2info(inode);
65 OBD_SLAB_FREE(ptr, ll_inode_cachep, sizeof(*ptr));
68 static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags)
70 struct ll_inode_info *lli = foo;
72 if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
73 SLAB_CTOR_CONSTRUCTOR)
74 inode_init_once(&lli->lli_vfs_inode);
77 int ll_init_inodecache(void)
79 ll_inode_cachep = kmem_cache_create("lustre_inode_cache",
80 sizeof(struct ll_inode_info),
81 0, SLAB_HWCACHE_ALIGN,
83 if (ll_inode_cachep == NULL)
88 void ll_destroy_inodecache(void)
90 if (kmem_cache_destroy(ll_inode_cachep))
91 CERROR("ll_inode_cache: not all structures were freed\n");
94 /* exported operations */
95 struct super_operations ll_super_operations =
97 alloc_inode: ll_alloc_inode,
98 destroy_inode: ll_destroy_inode,
99 clear_inode: ll_clear_inode,
100 put_super: ll_put_super,
102 umount_begin: ll_umount_begin
106 struct file_system_type lustre_lite_fs_type = {
107 .owner = THIS_MODULE,
108 .name = "lustre_lite",
110 .kill_sb = kill_anon_super,
113 static int __init init_lustre_lite(void)
116 printk(KERN_INFO "Lustre Lite Client File System; "
117 "info@clusterfs.com\n");
118 rc = ll_init_inodecache();
121 ll_file_data_slab = kmem_cache_create("ll_file_data",
122 sizeof(struct ll_file_data), 0,
123 SLAB_HWCACHE_ALIGN, NULL, NULL);
124 if (ll_file_data_slab == NULL) {
125 ll_destroy_inodecache();
129 proc_lustre_fs_root = proc_lustre_root ?
130 proc_mkdir("llite", proc_lustre_root) : NULL;
132 return register_filesystem(&lustre_lite_fs_type);
135 static void __exit exit_lustre_lite(void)
137 unregister_filesystem(&lustre_lite_fs_type);
138 ll_destroy_inodecache();
139 kmem_cache_destroy(ll_file_data_slab);
140 if (proc_lustre_fs_root) {
141 lprocfs_remove(proc_lustre_fs_root);
142 proc_lustre_fs_root = NULL;
146 MODULE_AUTHOR("Cluster File Systems, Inc. <info@clusterfs.com>");
147 MODULE_DESCRIPTION("Lustre Lite Client File System");
148 MODULE_LICENSE("GPL");
150 module_init(init_lustre_lite);
151 module_exit(exit_lustre_lite);