root/fs/gfs2/main.c

DEFINITIONS

1. gfs2_init_inode_once
2. gfs2_init_glock_once
3. init_gfs2_fs
4. exit_gfs2_fs

/*
 * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
 * Copyright (C) 2004-2006 Red Hat, Inc.  All rights reserved.
 *
 * This copyrighted material is made available to anyone wishing to use,
 * modify, copy, or redistribute it subject to the terms and conditions
 * of the GNU General Public License version 2.
 */

#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/completion.h>
#include <linux/buffer_head.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/gfs2_ondisk.h>
#include <linux/lm_interface.h>
#include <asm/atomic.h>

#include "gfs2.h"
#include "incore.h"
#include "ops_fstype.h"
#include "sys.h"
#include "util.h"
#include "glock.h"

static void gfs2_init_inode_once(void *foo)
{
        struct gfs2_inode *ip = foo;

        inode_init_once(&ip->i_inode);
        init_rwsem(&ip->i_rw_mutex);
        ip->i_alloc = NULL;
}

static void gfs2_init_glock_once(void *foo)
{
        struct gfs2_glock *gl = foo;

        INIT_HLIST_NODE(&gl->gl_list);
        spin_lock_init(&gl->gl_spin);
        INIT_LIST_HEAD(&gl->gl_holders);
        gl->gl_lvb = NULL;
        atomic_set(&gl->gl_lvb_count, 0);
        INIT_LIST_HEAD(&gl->gl_reclaim);
        INIT_LIST_HEAD(&gl->gl_ail_list);
        atomic_set(&gl->gl_ail_count, 0);
}

/**
 * init_gfs2_fs - Register GFS2 as a filesystem
 *
 * Returns: 0 on success, error code on failure
 */

static int __init init_gfs2_fs(void)
{
        int error;

        error = gfs2_sys_init();
        if (error)
                return error;

        error = gfs2_glock_init();
        if (error)
                goto fail;

        error = -ENOMEM;
        gfs2_glock_cachep = kmem_cache_create("gfs2_glock",
                                              sizeof(struct gfs2_glock),
                                              0, 0,
                                              gfs2_init_glock_once);
        if (!gfs2_glock_cachep)
                goto fail;

        gfs2_inode_cachep = kmem_cache_create("gfs2_inode",
                                              sizeof(struct gfs2_inode),
                                              0,  SLAB_RECLAIM_ACCOUNT|
                                                  SLAB_MEM_SPREAD,
                                              gfs2_init_inode_once);
        if (!gfs2_inode_cachep)
                goto fail;

        gfs2_bufdata_cachep = kmem_cache_create("gfs2_bufdata",
                                                sizeof(struct gfs2_bufdata),
                                                0, 0, NULL);
        if (!gfs2_bufdata_cachep)
                goto fail;

        gfs2_rgrpd_cachep = kmem_cache_create("gfs2_rgrpd",
                                              sizeof(struct gfs2_rgrpd),
                                              0, 0, NULL);
        if (!gfs2_rgrpd_cachep)
                goto fail;

        error = register_filesystem(&gfs2_fs_type);
        if (error)
                goto fail;

        error = register_filesystem(&gfs2meta_fs_type);
        if (error)
                goto fail_unregister;

        gfs2_register_debugfs();

        printk("GFS2 (built %s %s) installed\n", __DATE__, __TIME__);

        return 0;

fail_unregister:
        unregister_filesystem(&gfs2_fs_type);
fail:
        gfs2_glock_exit();

        if (gfs2_rgrpd_cachep)
                kmem_cache_destroy(gfs2_rgrpd_cachep);

        if (gfs2_bufdata_cachep)
                kmem_cache_destroy(gfs2_bufdata_cachep);

        if (gfs2_inode_cachep)
                kmem_cache_destroy(gfs2_inode_cachep);

        if (gfs2_glock_cachep)
                kmem_cache_destroy(gfs2_glock_cachep);

        gfs2_sys_uninit();
        return error;
}

/**
 * exit_gfs2_fs - Unregister the file system
 *
 */

static void __exit exit_gfs2_fs(void)
{
        gfs2_glock_exit();
        gfs2_unregister_debugfs();
        unregister_filesystem(&gfs2_fs_type);
        unregister_filesystem(&gfs2meta_fs_type);

        kmem_cache_destroy(gfs2_rgrpd_cachep);
        kmem_cache_destroy(gfs2_bufdata_cachep);
        kmem_cache_destroy(gfs2_inode_cachep);
        kmem_cache_destroy(gfs2_glock_cachep);

        gfs2_sys_uninit();
}

MODULE_DESCRIPTION("Global File System");
MODULE_AUTHOR("Red Hat, Inc.");
MODULE_LICENSE("GPL");

module_init(init_gfs2_fs);
module_exit(exit_gfs2_fs);