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         .shrink = gfs2_shrink_qd_memory,
  36         .seeks = DEFAULT_SEEKS,
  37 };
  38
  39 static void gfs2_init_inode_once(void *foo)
  40 {
  41         struct gfs2_inode *ip = foo;
  42
  43         inode_init_once(&ip->i_inode);
  44         init_rwsem(&ip->i_rw_mutex);
  45         INIT_LIST_HEAD(&ip->i_trunc_list);
  46         ip->i_qadata = NULL;
  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 static void *gfs2_bh_alloc(gfp_t mask, void *data)
  74 {
  75         return alloc_buffer_head(mask);
  76 }
  77
  78 static void gfs2_bh_free(void *ptr, void *data)
  79 {
  80         return free_buffer_head(ptr);
  81 }
  82
  83 /**
  84  * init_gfs2_fs - Register GFS2 as a filesystem
  85  *
  86  * Returns: 0 on success, error code on failure
  87  */
  88
  89 static int __init init_gfs2_fs(void)
  90 {
  91         int error;
  92
  93         gfs2_str2qstr(&gfs2_qdot, ".");
  94         gfs2_str2qstr(&gfs2_qdotdot, "..");
  95
  96         error = gfs2_sys_init();
  97         if (error)
  98                 return error;
  99
 100         error = gfs2_glock_init();
 101         if (error)
 102                 goto fail;
 103
 104         error = -ENOMEM;
 105         gfs2_glock_cachep = kmem_cache_create("gfs2_glock",
 106                                               sizeof(struct gfs2_glock),
 107                                               0, 0,
 108                                               gfs2_init_glock_once);
 109         if (!gfs2_glock_cachep)
 110                 goto fail;
 111
 112         gfs2_glock_aspace_cachep = kmem_cache_create("gfs2_glock(aspace)",
 113                                         sizeof(struct gfs2_glock) +
 114                                         sizeof(struct address_space),
 115                                         0, 0, gfs2_init_gl_aspace_once);
 116
 117         if (!gfs2_glock_aspace_cachep)
 118                 goto fail;
 119
 120         gfs2_inode_cachep = kmem_cache_create("gfs2_inode",
 121                                               sizeof(struct gfs2_inode),
 122                                               0,  SLAB_RECLAIM_ACCOUNT|
 123                                                   SLAB_MEM_SPREAD,
 124                                               gfs2_init_inode_once);
 125         if (!gfs2_inode_cachep)
 126                 goto fail;
 127
 128         gfs2_bufdata_cachep = kmem_cache_create("gfs2_bufdata",
 129                                                 sizeof(struct gfs2_bufdata),
 130                                                 0, 0, NULL);
 131         if (!gfs2_bufdata_cachep)
 132                 goto fail;
 133
 134         gfs2_rgrpd_cachep = kmem_cache_create("gfs2_rgrpd",
 135                                               sizeof(struct gfs2_rgrpd),
 136                                               0, 0, NULL);
 137         if (!gfs2_rgrpd_cachep)
 138                 goto fail;
 139
 140         gfs2_quotad_cachep = kmem_cache_create("gfs2_quotad",
 141                                                sizeof(struct gfs2_quota_data),
 142                                                0, 0, NULL);
 143         if (!gfs2_quotad_cachep)
 144                 goto fail;
 145
 146         register_shrinker(&qd_shrinker);
 147
 148         error = register_filesystem(&gfs2_fs_type);
 149         if (error)
 150                 goto fail;
 151
 152         error = register_filesystem(&gfs2meta_fs_type);
 153         if (error)
 154                 goto fail_unregister;
 155
 156         error = -ENOMEM;
 157         gfs_recovery_wq = alloc_workqueue("gfs_recovery",
 158                                           WQ_MEM_RECLAIM | WQ_FREEZABLE, 0);
 159         if (!gfs_recovery_wq)
 160                 goto fail_wq;
 161
 162         gfs2_control_wq = alloc_workqueue("gfs2_control",
 163                                WQ_NON_REENTRANT | WQ_UNBOUND | WQ_FREEZABLE, 0);
 164         if (!gfs2_control_wq)
 165                 goto fail_recovery;
 166
 167         gfs2_bh_pool = mempool_create(1024, gfs2_bh_alloc, gfs2_bh_free, NULL);
 168         if (!gfs2_bh_pool)
 169                 goto fail_control;
 170
 171         gfs2_register_debugfs();
 172
 173         printk("GFS2 installed\n");
 174
 175         return 0;
 176
 177 fail_control:
 178         destroy_workqueue(gfs2_control_wq);
 179 fail_recovery:
 180         destroy_workqueue(gfs_recovery_wq);
 181 fail_wq:
 182         unregister_filesystem(&gfs2meta_fs_type);
 183 fail_unregister:
 184         unregister_filesystem(&gfs2_fs_type);
 185 fail:
 186         unregister_shrinker(&qd_shrinker);
 187         gfs2_glock_exit();
 188
 189         if (gfs2_quotad_cachep)
 190                 kmem_cache_destroy(gfs2_quotad_cachep);
 191
 192         if (gfs2_rgrpd_cachep)
 193                 kmem_cache_destroy(gfs2_rgrpd_cachep);
 194
 195         if (gfs2_bufdata_cachep)
 196                 kmem_cache_destroy(gfs2_bufdata_cachep);
 197
 198         if (gfs2_inode_cachep)
 199                 kmem_cache_destroy(gfs2_inode_cachep);
 200
 201         if (gfs2_glock_aspace_cachep)
 202                 kmem_cache_destroy(gfs2_glock_aspace_cachep);
 203
 204         if (gfs2_glock_cachep)
 205                 kmem_cache_destroy(gfs2_glock_cachep);
 206
 207         gfs2_sys_uninit();
 208         return error;
 209 }
 210
 211 /**
 212  * exit_gfs2_fs - Unregister the file system
 213  *
 214  */
 215
 216 static void __exit exit_gfs2_fs(void)
 217 {
 218         unregister_shrinker(&qd_shrinker);
 219         gfs2_glock_exit();
 220         gfs2_unregister_debugfs();
 221         unregister_filesystem(&gfs2_fs_type);
 222         unregister_filesystem(&gfs2meta_fs_type);
 223         destroy_workqueue(gfs_recovery_wq);
 224         destroy_workqueue(gfs2_control_wq);
 225
 226         rcu_barrier();
 227
 228         mempool_destroy(gfs2_bh_pool);
 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