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/rcupdate.h>
  18 #include <linux/rculist_bl.h>
  19 #include <linux/atomic.h>
  20 #include <linux/mempool.h>
  21
  22 #include "gfs2.h"
  23 #include "incore.h"
  24 #include "super.h"
  25 #include "sys.h"
  26 #include "util.h"
  27 #include "glock.h"
  28 #include "quota.h"
  29 #include "recovery.h"
  30 #include "dir.h"
  31
  32 struct workqueue_struct *gfs2_control_wq;
  33
  34 static struct shrinker qd_shrinker = {
  35         .count_objects = gfs2_qd_shrink_count,
  36         .scan_objects = gfs2_qd_shrink_scan,
  37         .seeks = DEFAULT_SEEKS,
  38 };
  39
  40 static void gfs2_init_inode_once(void *foo)
  41 {
  42         struct gfs2_inode *ip = foo;
  43
  44         inode_init_once(&ip->i_inode);
  45         init_rwsem(&ip->i_rw_mutex);
  46         INIT_LIST_HEAD(&ip->i_trunc_list);
  47         ip->i_res = NULL;
  48         ip->i_hash_cache = NULL;
  49 }
  50
  51 static void gfs2_init_glock_once(void *foo)
  52 {
  53         struct gfs2_glock *gl = foo;
  54
  55         INIT_HLIST_BL_NODE(&gl->gl_list);
  56         spin_lock_init(&gl->gl_spin);
  57         INIT_LIST_HEAD(&gl->gl_holders);
  58         INIT_LIST_HEAD(&gl->gl_lru);
  59         INIT_LIST_HEAD(&gl->gl_ail_list);
  60         atomic_set(&gl->gl_ail_count, 0);
  61         atomic_set(&gl->gl_revokes, 0);
  62 }
  63
  64 static void gfs2_init_gl_aspace_once(void *foo)
  65 {
  66         struct gfs2_glock *gl = foo;
  67         struct address_space *mapping = (struct address_space *)(gl + 1);
  68
  69         gfs2_init_glock_once(gl);
  70         address_space_init_once(mapping);
  71 }
  72
  73 /**
  74  * init_gfs2_fs - Register GFS2 as a filesystem
  75  *
  76  * Returns: 0 on success, error code on failure
  77  */
  78
  79 static int __init init_gfs2_fs(void)
  80 {
  81         int error;
  82
  83         gfs2_str2qstr(&gfs2_qdot, ".");
  84         gfs2_str2qstr(&gfs2_qdotdot, "..");
  85
  86         error = gfs2_sys_init();
  87         if (error)
  88                 return error;
  89
  90         error = gfs2_glock_init();
  91         if (error)
  92                 goto fail;
  93
  94         error = -ENOMEM;
  95         gfs2_glock_cachep = kmem_cache_create("gfs2_glock",
  96                                               sizeof(struct gfs2_glock),
  97                                               0, 0,
  98                                               gfs2_init_glock_once);
  99         if (!gfs2_glock_cachep)
 100                 goto fail;
 101
 102         gfs2_glock_aspace_cachep = kmem_cache_create("gfs2_glock(aspace)",
 103                                         sizeof(struct gfs2_glock) +
 104                                         sizeof(struct address_space),
 105                                         0, 0, gfs2_init_gl_aspace_once);
 106
 107         if (!gfs2_glock_aspace_cachep)
 108                 goto fail;
 109
 110         gfs2_inode_cachep = kmem_cache_create("gfs2_inode",
 111                                               sizeof(struct gfs2_inode),
 112                                               0,  SLAB_RECLAIM_ACCOUNT|
 113                                                   SLAB_MEM_SPREAD,
 114                                               gfs2_init_inode_once);
 115         if (!gfs2_inode_cachep)
 116                 goto fail;
 117
 118         gfs2_bufdata_cachep = kmem_cache_create("gfs2_bufdata",
 119                                                 sizeof(struct gfs2_bufdata),
 120                                                 0, 0, NULL);
 121         if (!gfs2_bufdata_cachep)
 122                 goto fail;
 123
 124         gfs2_rgrpd_cachep = kmem_cache_create("gfs2_rgrpd",
 125                                               sizeof(struct gfs2_rgrpd),
 126                                               0, 0, NULL);
 127         if (!gfs2_rgrpd_cachep)
 128                 goto fail;
 129
 130         gfs2_quotad_cachep = kmem_cache_create("gfs2_quotad",
 131                                                sizeof(struct gfs2_quota_data),
 132                                                0, 0, NULL);
 133         if (!gfs2_quotad_cachep)
 134                 goto fail;
 135
 136         gfs2_rsrv_cachep = kmem_cache_create("gfs2_mblk",
 137                                              sizeof(struct gfs2_blkreserv),
 138                                                0, 0, NULL);
 139         if (!gfs2_rsrv_cachep)
 140                 goto fail;
 141
 142         register_shrinker(&qd_shrinker);
 143
 144         error = register_filesystem(&gfs2_fs_type);
 145         if (error)
 146                 goto fail;
 147
 148         error = register_filesystem(&gfs2meta_fs_type);
 149         if (error)
 150                 goto fail_unregister;
 151
 152         error = -ENOMEM;
 153         gfs_recovery_wq = alloc_workqueue("gfs_recovery",
 154                                           WQ_MEM_RECLAIM | WQ_FREEZABLE, 0);
 155         if (!gfs_recovery_wq)
 156                 goto fail_wq;
 157
 158         gfs2_control_wq = alloc_workqueue("gfs2_control",
 159                                           WQ_UNBOUND | WQ_FREEZABLE, 0);
 160         if (!gfs2_control_wq)
 161                 goto fail_recovery;
 162
 163         gfs2_page_pool = mempool_create_page_pool(64, 0);
 164         if (!gfs2_page_pool)
 165                 goto fail_control;
 166
 167         gfs2_register_debugfs();
 168
 169         printk("GFS2 installed\n");
 170
 171         return 0;
 172
 173 fail_control:
 174         destroy_workqueue(gfs2_control_wq);
 175 fail_recovery:
 176         destroy_workqueue(gfs_recovery_wq);
 177 fail_wq:
 178         unregister_filesystem(&gfs2meta_fs_type);
 179 fail_unregister:
 180         unregister_filesystem(&gfs2_fs_type);
 181 fail:
 182         unregister_shrinker(&qd_shrinker);
 183         gfs2_glock_exit();
 184
 185         if (gfs2_rsrv_cachep)
 186                 kmem_cache_destroy(gfs2_rsrv_cachep);
 187
 188         if (gfs2_quotad_cachep)
 189                 kmem_cache_destroy(gfs2_quotad_cachep);
 190
 191         if (gfs2_rgrpd_cachep)
 192                 kmem_cache_destroy(gfs2_rgrpd_cachep);
 193
 194         if (gfs2_bufdata_cachep)
 195                 kmem_cache_destroy(gfs2_bufdata_cachep);
 196
 197         if (gfs2_inode_cachep)
 198                 kmem_cache_destroy(gfs2_inode_cachep);
 199
 200         if (gfs2_glock_aspace_cachep)
 201                 kmem_cache_destroy(gfs2_glock_aspace_cachep);
 202
 203         if (gfs2_glock_cachep)
 204                 kmem_cache_destroy(gfs2_glock_cachep);
 205
 206         gfs2_sys_uninit();
 207         return error;
 208 }
 209
 210 /**
 211  * exit_gfs2_fs - Unregister the file system
 212  *
 213  */
 214
 215 static void __exit exit_gfs2_fs(void)
 216 {
 217         unregister_shrinker(&qd_shrinker);
 218         gfs2_glock_exit();
 219         gfs2_unregister_debugfs();
 220         unregister_filesystem(&gfs2_fs_type);
 221         unregister_filesystem(&gfs2meta_fs_type);
 222         destroy_workqueue(gfs_recovery_wq);
 223         destroy_workqueue(gfs2_control_wq);
 224
 225         rcu_barrier();
 226
 227         mempool_destroy(gfs2_page_pool);
 228         kmem_cache_destroy(gfs2_rsrv_cachep);
 229         kmem_cache_destroy(gfs2_quotad_cachep);
 230         kmem_cache_destroy(gfs2_rgrpd_cachep);
 231         kmem_cache_destroy(gfs2_bufdata_cachep);
 232         kmem_cache_destroy(gfs2_inode_cachep);
 233         kmem_cache_destroy(gfs2_glock_aspace_cachep);
 234         kmem_cache_destroy(gfs2_glock_cachep);
 235
 236         gfs2_sys_uninit();
 237 }
 238
 239 MODULE_DESCRIPTION("Global File System");
 240 MODULE_AUTHOR("Red Hat, Inc.");
 241 MODULE_LICENSE("GPL");
 242
 243 module_init(init_gfs2_fs);
 244 module_exit(exit_gfs2_fs);
 245