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 <asm/atomic.h>
  19
  20 #include "gfs2.h"
  21 #include "lm_interface.h"
  22 #include "incore.h"
  23 #include "ops_fstype.h"
  24 #include "sys.h"
  25 #include "util.h"
  26
  27 static void gfs2_init_inode_once(void *foo, kmem_cache_t *cachep, unsigned long flags)
  28 {
  29         struct gfs2_inode *ip = foo;
  30         if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
  31             SLAB_CTOR_CONSTRUCTOR) {
  32                 inode_init_once(&ip->i_inode);
  33                 spin_lock_init(&ip->i_spin);
  34                 init_rwsem(&ip->i_rw_mutex);
  35                 memset(ip->i_cache, 0, sizeof(ip->i_cache));
  36         }
  37 }
  38
  39 static void gfs2_init_glock_once(void *foo, kmem_cache_t *cachep, unsigned long flags)
  40 {
  41         struct gfs2_glock *gl = foo;
  42         if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
  43             SLAB_CTOR_CONSTRUCTOR) {
  44                 INIT_LIST_HEAD(&gl->gl_list);
  45                 spin_lock_init(&gl->gl_spin);
  46                 INIT_LIST_HEAD(&gl->gl_holders);
  47                 INIT_LIST_HEAD(&gl->gl_waiters1);
  48                 INIT_LIST_HEAD(&gl->gl_waiters2);
  49                 INIT_LIST_HEAD(&gl->gl_waiters3);
  50                 gl->gl_lvb = NULL;
  51                 atomic_set(&gl->gl_lvb_count, 0);
  52                 INIT_LIST_HEAD(&gl->gl_reclaim);
  53                 INIT_LIST_HEAD(&gl->gl_ail_list);
  54                 atomic_set(&gl->gl_ail_count, 0);
  55         }
  56 }
  57
  58 /**
  59  * init_gfs2_fs - Register GFS2 as a filesystem
  60  *
  61  * Returns: 0 on success, error code on failure
  62  */
  63
  64 static int __init init_gfs2_fs(void)
  65 {
  66         int error;
  67
  68         gfs2_init_lmh();
  69
  70         error = gfs2_sys_init();
  71         if (error)
  72                 return error;
  73
  74         error = -ENOMEM;
  75
  76         gfs2_glock_cachep = kmem_cache_create("gfs2_glock",
  77                                               sizeof(struct gfs2_glock),
  78                                               0, 0,
  79                                               gfs2_init_glock_once, NULL);
  80         if (!gfs2_glock_cachep)
  81                 goto fail;
  82
  83         gfs2_inode_cachep = kmem_cache_create("gfs2_inode",
  84                                               sizeof(struct gfs2_inode),
  85                                               0, (SLAB_RECLAIM_ACCOUNT|
  86                                               SLAB_PANIC|SLAB_MEM_SPREAD),
  87                                               gfs2_init_inode_once, NULL);
  88         if (!gfs2_inode_cachep)
  89                 goto fail;
  90
  91         gfs2_bufdata_cachep = kmem_cache_create("gfs2_bufdata",
  92                                                 sizeof(struct gfs2_bufdata),
  93                                                 0, 0, NULL, NULL);
  94         if (!gfs2_bufdata_cachep)
  95                 goto fail;
  96
  97         error = register_filesystem(&gfs2_fs_type);
  98         if (error)
  99                 goto fail;
 100
 101         error = register_filesystem(&gfs2meta_fs_type);
 102         if (error)
 103                 goto fail_unregister;
 104
 105         printk("GFS2 (built %s %s) installed\n", __DATE__, __TIME__);
 106
 107         return 0;
 108
 109 fail_unregister:
 110         unregister_filesystem(&gfs2_fs_type);
 111 fail:
 112         if (gfs2_bufdata_cachep)
 113                 kmem_cache_destroy(gfs2_bufdata_cachep);
 114
 115         if (gfs2_inode_cachep)
 116                 kmem_cache_destroy(gfs2_inode_cachep);
 117
 118         if (gfs2_glock_cachep)
 119                 kmem_cache_destroy(gfs2_glock_cachep);
 120
 121         gfs2_sys_uninit();
 122         return error;
 123 }
 124
 125 /**
 126  * exit_gfs2_fs - Unregister the file system
 127  *
 128  */
 129
 130 static void __exit exit_gfs2_fs(void)
 131 {
 132         unregister_filesystem(&gfs2_fs_type);
 133         unregister_filesystem(&gfs2meta_fs_type);
 134
 135         kmem_cache_destroy(gfs2_bufdata_cachep);
 136         kmem_cache_destroy(gfs2_inode_cachep);
 137         kmem_cache_destroy(gfs2_glock_cachep);
 138
 139         gfs2_sys_uninit();
 140 }
 141
 142 MODULE_DESCRIPTION("Global File System");
 143 MODULE_AUTHOR("Red Hat, Inc.");
 144 MODULE_LICENSE("GPL");
 145
 146 module_init(init_gfs2_fs);
 147 module_exit(exit_gfs2_fs);
 148