fs/gfs2/main.c

   1 /*
   2  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
   3  * Copyright (C) 2004-2006 Red Hat, Inc.  All rights reserved.
   4  *
   5  * This copyrighted material is made available to anyone wishing to use,
   6  * modify, copy, or redistribute it subject to the terms and conditions
   7  * of the GNU General Public License version 2.
   8  */
   9
  10 #include <linux/sched.h>
  11 #include <linux/slab.h>
  12 #include <linux/spinlock.h>
  13 #include <linux/completion.h>
  14 #include <linux/buffer_head.h>
  15 #include <linux/module.h>
  16 #include <linux/init.h>
  17 #include <linux/gfs2_ondisk.h>
  18 #include <linux/lm_interface.h>
  19 #include <asm/atomic.h>
  20
  21 #include "gfs2.h"
  22 #include "incore.h"
  23 #include "ops_fstype.h"
  24 #include "sys.h"
  25 #include "util.h"
  26 #include "glock.h"
  27
  28 static void gfs2_init_inode_once(void *foo, kmem_cache_t *cachep, unsigned long flags)
  29 {
  30         struct gfs2_inode *ip = foo;
  31         if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
  32             SLAB_CTOR_CONSTRUCTOR) {
  33                 inode_init_once(&ip->i_inode);
  34                 spin_lock_init(&ip->i_spin);
  35                 init_rwsem(&ip->i_rw_mutex);
  36                 memset(ip->i_cache, 0, sizeof(ip->i_cache));
  37         }
  38 }
  39
  40 static void gfs2_init_glock_once(void *foo, kmem_cache_t *cachep, unsigned long flags)
  41 {
  42         struct gfs2_glock *gl = foo;
  43         if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
  44             SLAB_CTOR_CONSTRUCTOR) {
  45                 INIT_HLIST_NODE(&gl->gl_list);
  46                 spin_lock_init(&gl->gl_spin);
  47                 INIT_LIST_HEAD(&gl->gl_holders);
  48                 INIT_LIST_HEAD(&gl->gl_waiters1);
  49                 INIT_LIST_HEAD(&gl->gl_waiters2);
  50                 INIT_LIST_HEAD(&gl->gl_waiters3);
  51                 gl->gl_lvb = NULL;
  52                 atomic_set(&gl->gl_lvb_count, 0);
  53                 INIT_LIST_HEAD(&gl->gl_reclaim);
  54                 INIT_LIST_HEAD(&gl->gl_ail_list);
  55                 atomic_set(&gl->gl_ail_count, 0);
  56         }
  57 }
  58
  59 /**
  60  * init_gfs2_fs - Register GFS2 as a filesystem
  61  *
  62  * Returns: 0 on success, error code on failure
  63  */
  64
  65 static int __init init_gfs2_fs(void)
  66 {
  67         int error;
  68
  69         error = gfs2_sys_init();
  70         if (error)
  71                 return error;
  72
  73         error = gfs2_glock_init();
  74         if (error)
  75                 goto fail;
  76
  77         error = -ENOMEM;
  78         gfs2_glock_cachep = kmem_cache_create("gfs2_glock",
  79                                               sizeof(struct gfs2_glock),
  80                                               0, 0,
  81                                               gfs2_init_glock_once, NULL);
  82         if (!gfs2_glock_cachep)
  83                 goto fail;
  84
  85         gfs2_inode_cachep = kmem_cache_create("gfs2_inode",
  86                                               sizeof(struct gfs2_inode),
  87                                               0, (SLAB_RECLAIM_ACCOUNT|
  88                                               SLAB_PANIC|SLAB_MEM_SPREAD),
  89                                               gfs2_init_inode_once, NULL);
  90         if (!gfs2_inode_cachep)
  91                 goto fail;
  92
  93         gfs2_bufdata_cachep = kmem_cache_create("gfs2_bufdata",
  94                                                 sizeof(struct gfs2_bufdata),
  95                                                 0, 0, NULL, NULL);
  96         if (!gfs2_bufdata_cachep)
  97                 goto fail;
  98
  99         error = register_filesystem(&gfs2_fs_type);
 100         if (error)
 101                 goto fail;
 102
 103         error = register_filesystem(&gfs2meta_fs_type);
 104         if (error)
 105                 goto fail_unregister;
 106
 107         printk("GFS2 (built %s %s) installed\n", __DATE__, __TIME__);
 108
 109         return 0;
 110
 111 fail_unregister:
 112         unregister_filesystem(&gfs2_fs_type);
 113 fail:
 114         if (gfs2_bufdata_cachep)
 115                 kmem_cache_destroy(gfs2_bufdata_cachep);
 116
 117         if (gfs2_inode_cachep)
 118                 kmem_cache_destroy(gfs2_inode_cachep);
 119
 120         if (gfs2_glock_cachep)
 121                 kmem_cache_destroy(gfs2_glock_cachep);
 122
 123         gfs2_sys_uninit();
 124         return error;
 125 }
 126
 127 /**
 128  * exit_gfs2_fs - Unregister the file system
 129  *
 130  */
 131
 132 static void __exit exit_gfs2_fs(void)
 133 {
 134         unregister_filesystem(&gfs2_fs_type);
 135         unregister_filesystem(&gfs2meta_fs_type);
 136
 137         kmem_cache_destroy(gfs2_bufdata_cachep);
 138         kmem_cache_destroy(gfs2_inode_cachep);
 139         kmem_cache_destroy(gfs2_glock_cachep);
 140
 141         gfs2_sys_uninit();
 142 }
 143
 144 MODULE_DESCRIPTION("Global File System");
 145 MODULE_AUTHOR("Red Hat, Inc.");
 146 MODULE_LICENSE("GPL");
 147
 148 module_init(init_gfs2_fs);
 149 module_exit(exit_gfs2_fs);
 150