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/slab.h>
  11 #include <linux/spinlock.h>
  12 #include <linux/completion.h>
  13 #include <linux/buffer_head.h>
  14 #include <linux/module.h>
  15 #include <linux/init.h>
  16 #include <linux/gfs2_ondisk.h>
  17 #include <linux/lm_interface.h>
  18 #include <asm/atomic.h>
  19
  20 #include "gfs2.h"
  21 #include "incore.h"
  22 #include "ops_fstype.h"
  23 #include "sys.h"
  24 #include "util.h"
  25 #include "glock.h"
  26
  27 static void gfs2_init_inode_once(void *foo, struct kmem_cache *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, struct kmem_cache *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_HLIST_NODE(&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         error = gfs2_sys_init();
  69         if (error)
  70                 return error;
  71
  72         error = gfs2_glock_init();
  73         if (error)
  74                 goto fail;
  75
  76         error = -ENOMEM;
  77         gfs2_glock_cachep = kmem_cache_create("gfs2_glock",
  78                                               sizeof(struct gfs2_glock),
  79                                               0, 0,
  80                                               gfs2_init_glock_once, NULL);
  81         if (!gfs2_glock_cachep)
  82                 goto fail;
  83
  84         gfs2_inode_cachep = kmem_cache_create("gfs2_inode",
  85                                               sizeof(struct gfs2_inode),
  86                                               0,  SLAB_RECLAIM_ACCOUNT|
  87                                                   SLAB_MEM_SPREAD,
  88                                               gfs2_init_inode_once, NULL);
  89         if (!gfs2_inode_cachep)
  90                 goto fail;
  91
  92         gfs2_bufdata_cachep = kmem_cache_create("gfs2_bufdata",
  93                                                 sizeof(struct gfs2_bufdata),
  94                                                 0, 0, NULL, NULL);
  95         if (!gfs2_bufdata_cachep)
  96                 goto fail;
  97
  98         error = register_filesystem(&gfs2_fs_type);
  99         if (error)
 100                 goto fail;
 101
 102         error = register_filesystem(&gfs2meta_fs_type);
 103         if (error)
 104                 goto fail_unregister;
 105
 106         printk("GFS2 (built %s %s) installed\n", __DATE__, __TIME__);
 107
 108         return 0;
 109
 110 fail_unregister:
 111         unregister_filesystem(&gfs2_fs_type);
 112 fail:
 113         if (gfs2_bufdata_cachep)
 114                 kmem_cache_destroy(gfs2_bufdata_cachep);
 115
 116         if (gfs2_inode_cachep)
 117                 kmem_cache_destroy(gfs2_inode_cachep);
 118
 119         if (gfs2_glock_cachep)
 120                 kmem_cache_destroy(gfs2_glock_cachep);
 121
 122         gfs2_sys_uninit();
 123         return error;
 124 }
 125
 126 /**
 127  * exit_gfs2_fs - Unregister the file system
 128  *
 129  */
 130
 131 static void __exit exit_gfs2_fs(void)
 132 {
 133         unregister_filesystem(&gfs2_fs_type);
 134         unregister_filesystem(&gfs2meta_fs_type);
 135
 136         kmem_cache_destroy(gfs2_bufdata_cachep);
 137         kmem_cache_destroy(gfs2_inode_cachep);
 138         kmem_cache_destroy(gfs2_glock_cachep);
 139
 140         gfs2_sys_uninit();
 141 }
 142
 143 MODULE_DESCRIPTION("Global File System");
 144 MODULE_AUTHOR("Red Hat, Inc.");
 145 MODULE_LICENSE("GPL");
 146
 147 module_init(init_gfs2_fs);
 148 module_exit(exit_gfs2_fs);
 149