SAFE public projects git trees. - safe/jmp/linux-2.6/blob - 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         error = gfs2_sys_init();
  69         if (error)
  70                 return error;
  71
  72         error = -ENOMEM;
  73
  74         gfs2_glock_cachep = kmem_cache_create("gfs2_glock",
  75                                               sizeof(struct gfs2_glock),
  76                                               0, 0,
  77                                               gfs2_init_glock_once, NULL);
  78         if (!gfs2_glock_cachep)
  79                 goto fail;
  80
  81         gfs2_inode_cachep = kmem_cache_create("gfs2_inode",
  82                                               sizeof(struct gfs2_inode),
  83                                               0, (SLAB_RECLAIM_ACCOUNT|
  84                                               SLAB_PANIC|SLAB_MEM_SPREAD),
  85                                               gfs2_init_inode_once, NULL);
  86         if (!gfs2_inode_cachep)
  87                 goto fail;
  88
  89         gfs2_bufdata_cachep = kmem_cache_create("gfs2_bufdata",
  90                                                 sizeof(struct gfs2_bufdata),
  91                                                 0, 0, NULL, NULL);
  92         if (!gfs2_bufdata_cachep)
  93                 goto fail;
  94
  95         error = register_filesystem(&gfs2_fs_type);
  96         if (error)
  97                 goto fail;
  98
  99         error = register_filesystem(&gfs2meta_fs_type);
 100         if (error)
 101                 goto fail_unregister;
 102
 103         printk("GFS2 (built %s %s) installed\n", __DATE__, __TIME__);
 104
 105         return 0;
 106
 107 fail_unregister:
 108         unregister_filesystem(&gfs2_fs_type);
 109 fail:
 110         if (gfs2_bufdata_cachep)
 111                 kmem_cache_destroy(gfs2_bufdata_cachep);
 112
 113         if (gfs2_inode_cachep)
 114                 kmem_cache_destroy(gfs2_inode_cachep);
 115
 116         if (gfs2_glock_cachep)
 117                 kmem_cache_destroy(gfs2_glock_cachep);
 118
 119         gfs2_sys_uninit();
 120         return error;
 121 }
 122
 123 /**
 124  * exit_gfs2_fs - Unregister the file system
 125  *
 126  */
 127
 128 static void __exit exit_gfs2_fs(void)
 129 {
 130         unregister_filesystem(&gfs2_fs_type);
 131         unregister_filesystem(&gfs2meta_fs_type);
 132
 133         kmem_cache_destroy(gfs2_bufdata_cachep);
 134         kmem_cache_destroy(gfs2_inode_cachep);
 135         kmem_cache_destroy(gfs2_glock_cachep);
 136
 137         gfs2_sys_uninit();
 138 }
 139
 140 MODULE_DESCRIPTION("Global File System");
 141 MODULE_AUTHOR("Red Hat, Inc.");
 142 MODULE_LICENSE("GPL");
 143
 144 module_init(init_gfs2_fs);
 145 module_exit(exit_gfs2_fs);
 146