lustre/llite/super25.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  * Lustre Light Super operations
   5  *
   6  *  Copyright (c) 2002, 2003 Cluster File Systems, Inc.
   7  *
   8  *   This file is part of Lustre, http://www.lustre.org.
   9  *
  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.
  13  *
  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.
  18  *
  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.
  22  */
  23
  24 #define DEBUG_SUBSYSTEM S_LLITE
  25
  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>
  34 #include <linux/fs.h>
  35 #include <lprocfs_status.h>
  36 #include "llite_internal.h"
  37
  38 static kmem_cache_t *ll_inode_cachep;
  39
  40 static struct inode *ll_alloc_inode(struct super_block *sb)
  41 {
  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);
  45         if (lli == NULL)
  46                 return NULL;
  47
  48         inode_init_once(&lli->lli_vfs_inode);
  49         ll_lli_init(lli);
  50
  51         return &lli->lli_vfs_inode;
  52 }
  53
  54 static void ll_destroy_inode(struct inode *inode)
  55 {
  56         struct ll_inode_info *ptr = ll_i2info(inode);
  57         OBD_SLAB_FREE(ptr, ll_inode_cachep, sizeof(*ptr));
  58 }
  59
  60 static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags)
  61 {
  62         struct ll_inode_info *lli = foo;
  63
  64         if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
  65             SLAB_CTOR_CONSTRUCTOR)
  66                 inode_init_once(&lli->lli_vfs_inode);
  67 }
  68
  69 int ll_init_inodecache(void)
  70 {
  71         ll_inode_cachep = kmem_cache_create("lustre_inode_cache",
  72                                             sizeof(struct ll_inode_info),
  73                                             0, SLAB_HWCACHE_ALIGN,
  74                                             init_once, NULL);
  75         if (ll_inode_cachep == NULL)
  76                 return -ENOMEM;
  77         return 0;
  78 }
  79
  80 void ll_destroy_inodecache(void)
  81 {
  82         int rc;
  83
  84         rc = kmem_cache_destroy(ll_inode_cachep);
  85         LASSERTF(rc == 0, "ll_inode_cache: not all structures were freed\n");
  86 }
  87
  88 /* exported operations */
  89 struct super_operations lustre_super_operations =
  90 {
  91         .alloc_inode   = ll_alloc_inode,
  92         .destroy_inode = ll_destroy_inode,
  93         .clear_inode   = ll_clear_inode,
  94         .delete_inode  = ll_delete_inode,
  95         .put_super     = ll_put_super,
  96         .statfs        = ll_statfs,
  97         .umount_begin  = ll_umount_begin,
  98         .remount_fs    = ll_remount_fs,
  99 };
 100
 101
 102 static int __init init_lustre_lite(void)
 103 {
 104         int rc, seed[2];
 105         printk(KERN_INFO "Lustre: Lustre Client File System; "
 106                "info@clusterfs.com\n");
 107         rc = ll_init_inodecache();
 108         if (rc)
 109                 return -ENOMEM;
 110         ll_file_data_slab = kmem_cache_create("ll_file_data",
 111                                               sizeof(struct ll_file_data), 0,
 112                                               SLAB_HWCACHE_ALIGN, NULL, NULL);
 113         if (ll_file_data_slab == NULL) {
 114                 ll_destroy_inodecache();
 115                 return -ENOMEM;
 116         }
 117
 118         proc_lustre_fs_root = proc_lustre_root ?
 119                               proc_mkdir("llite", proc_lustre_root) : NULL;
 120
 121         ll_register_cache(&ll_cache_definition);
 122
 123         lustre_register_client_fill_super(ll_fill_super);
 124
 125         get_random_bytes(seed, sizeof(seed));
 126         ll_srand(seed[0], seed[1]);
 127
 128         return rc;
 129 }
 130
 131 static void __exit exit_lustre_lite(void)
 132 {
 133         int rc;
 134
 135         lustre_register_client_fill_super(NULL);
 136
 137         ll_unregister_cache(&ll_cache_definition);
 138
 139         ll_destroy_inodecache();
 140         rc = kmem_cache_destroy(ll_file_data_slab);
 141         LASSERTF(rc == 0, "couldn't destroy ll_file_data slab\n");
 142         if (ll_async_page_slab) {
 143                 rc = kmem_cache_destroy(ll_async_page_slab);
 144                 LASSERTF(rc == 0, "couldn't destroy ll_async_page slab\n");
 145         }
 146
 147         if (proc_lustre_fs_root) {
 148                 lprocfs_remove(proc_lustre_fs_root);
 149                 proc_lustre_fs_root = NULL;
 150         }
 151 }
 152
 153 MODULE_AUTHOR("Cluster File Systems, Inc. <info@clusterfs.com>");
 154 MODULE_DESCRIPTION("Lustre Lite Client File System");
 155 MODULE_LICENSE("GPL");
 156
 157 module_init(init_lustre_lite);
 158 module_exit(exit_lustre_lite);