main.c

Go to the documentation of this file.

/*
 * 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/rcupdate.h>
#include <linux/rculist_bl.h>
#include <linux/atomic.h>
#include <linux/mempool.h>

#include "gfs2.h"
#include "incore.h"
#include "super.h"
#include "sys.h"
#include "util.h"
#include "glock.h"
#include "quota.h"
#include "recovery.h"
#include "dir.h"

struct workqueue_struct *gfs2_control_wq;

static struct shrinker qd_shrinker = {
    .shrink = gfs2_shrink_qd_memory,
    .seeks = DEFAULT_SEEKS,
};

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);
    INIT_LIST_HEAD(&ip->i_trunc_list);
    ip->i_res = NULL;
    ip->i_hash_cache = NULL;
}

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

    INIT_HLIST_BL_NODE(&gl->gl_list);
    spin_lock_init(&gl->gl_spin);
    INIT_LIST_HEAD(&gl->gl_holders);
    INIT_LIST_HEAD(&gl->gl_lru);
    INIT_LIST_HEAD(&gl->gl_ail_list);
    atomic_set(&gl->gl_ail_count, 0);
    atomic_set(&gl->gl_revokes, 0);
}

static void gfs2_init_gl_aspace_once(void *foo)
{
    struct gfs2_glock *gl = foo;
    struct address_space *mapping = (struct address_space *)(gl + 1);

    gfs2_init_glock_once(gl);
    address_space_init_once(mapping);
}

static int __init init_gfs2_fs(void)
{
    int error;

    gfs2_str2qstr(&gfs2_qdot, ".");
    gfs2_str2qstr(&gfs2_qdotdot, "..");

    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_glock_aspace_cachep = kmem_cache_create("gfs2_glock(aspace)",
                    sizeof(struct gfs2_glock) +
                    sizeof(struct address_space),
                    0, 0, gfs2_init_gl_aspace_once);

    if (!gfs2_glock_aspace_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;

    gfs2_quotad_cachep = kmem_cache_create("gfs2_quotad",
                           sizeof(struct gfs2_quota_data),
                           0, 0, NULL);
    if (!gfs2_quotad_cachep)
        goto fail;

    gfs2_rsrv_cachep = kmem_cache_create("gfs2_mblk",
                         sizeof(struct gfs2_blkreserv),
                           0, 0, NULL);
    if (!gfs2_rsrv_cachep)
        goto fail;

    register_shrinker(&qd_shrinker);

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

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

    error = -ENOMEM;
    gfs_recovery_wq = alloc_workqueue("gfs_recovery",
                      WQ_MEM_RECLAIM | WQ_FREEZABLE, 0);
    if (!gfs_recovery_wq)
        goto fail_wq;

    gfs2_control_wq = alloc_workqueue("gfs2_control",
                   WQ_NON_REENTRANT | WQ_UNBOUND | WQ_FREEZABLE, 0);
    if (!gfs2_control_wq)
        goto fail_recovery;

    gfs2_page_pool = mempool_create_page_pool(64, 0);
    if (!gfs2_page_pool)
        goto fail_control;

    gfs2_register_debugfs();

    printk("GFS2 installed\n");

    return 0;

fail_control:
    destroy_workqueue(gfs2_control_wq);
fail_recovery:
    destroy_workqueue(gfs_recovery_wq);
fail_wq:
    unregister_filesystem(&gfs2meta_fs_type);
fail_unregister:
    unregister_filesystem(&gfs2_fs_type);
fail:
    unregister_shrinker(&qd_shrinker);
    gfs2_glock_exit();

    if (gfs2_rsrv_cachep)
        kmem_cache_destroy(gfs2_rsrv_cachep);

    if (gfs2_quotad_cachep)
        kmem_cache_destroy(gfs2_quotad_cachep);

    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_aspace_cachep)
        kmem_cache_destroy(gfs2_glock_aspace_cachep);

    if (gfs2_glock_cachep)
        kmem_cache_destroy(gfs2_glock_cachep);

    gfs2_sys_uninit();
    return error;
}

static void __exit exit_gfs2_fs(void)
{
    unregister_shrinker(&qd_shrinker);
    gfs2_glock_exit();
    gfs2_unregister_debugfs();
    unregister_filesystem(&gfs2_fs_type);
    unregister_filesystem(&gfs2meta_fs_type);
    destroy_workqueue(gfs_recovery_wq);
    destroy_workqueue(gfs2_control_wq);

    rcu_barrier();

    mempool_destroy(gfs2_page_pool);
    kmem_cache_destroy(gfs2_rsrv_cachep);
    kmem_cache_destroy(gfs2_quotad_cachep);
    kmem_cache_destroy(gfs2_rgrpd_cachep);
    kmem_cache_destroy(gfs2_bufdata_cachep);
    kmem_cache_destroy(gfs2_inode_cachep);
    kmem_cache_destroy(gfs2_glock_aspace_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);