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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  11
  12 #include <linux/slab.h>
  13 #include <linux/spinlock.h>
  14 #include <linux/completion.h>
  15 #include <linux/buffer_head.h>
  16 #include <linux/module.h>
  17 #include <linux/init.h>
  18 #include <linux/gfs2_ondisk.h>
  19 #include <linux/rcupdate.h>
  20 #include <linux/rculist_bl.h>
  21 #include <linux/atomic.h>
  22 #include <linux/mempool.h>
  23
  24 #include "gfs2.h"
  25 #include "incore.h"
  26 #include "super.h"
  27 #include "sys.h"
  28 #include "util.h"
  29 #include "glock.h"
  30 #include "quota.h"
  31 #include "recovery.h"
  32 #include "dir.h"
  33 #include "glops.h"
  34
  35 struct workqueue_struct *gfs2_control_wq;
  36
  37 static void gfs2_init_inode_once(void *foo)
  38 {
  39         struct gfs2_inode *ip = foo;
  40
  41         inode_init_once(&ip->i_inode);
  42         atomic_set(&ip->i_sizehint, 0);
  43         init_rwsem(&ip->i_rw_mutex);
  44         INIT_LIST_HEAD(&ip->i_trunc_list);
  45         ip->i_qadata = NULL;
  46         gfs2_holder_mark_uninitialized(&ip->i_rgd_gh);
  47         memset(&ip->i_res, 0, sizeof(ip->i_res));
  48         RB_CLEAR_NODE(&ip->i_res.rs_node);
  49         ip->i_hash_cache = NULL;
  50         gfs2_holder_mark_uninitialized(&ip->i_iopen_gh);
  51 }
  52
  53 static void gfs2_init_glock_once(void *foo)
  54 {
  55         struct gfs2_glock *gl = foo;
  56
  57         spin_lock_init(&gl->gl_lockref.lock);
  58         INIT_LIST_HEAD(&gl->gl_holders);
  59         INIT_LIST_HEAD(&gl->gl_lru);
  60         INIT_LIST_HEAD(&gl->gl_ail_list);
  61         atomic_set(&gl->gl_ail_count, 0);
  62         atomic_set(&gl->gl_revokes, 0);
  63 }
  64
  65 static void gfs2_init_gl_aspace_once(void *foo)
  66 {
  67         struct gfs2_glock *gl = foo;
  68         struct address_space *mapping = (struct address_space *)(gl + 1);
  69
  70         gfs2_init_glock_once(gl);
  71         address_space_init_once(mapping);
  72 }
  73
  74 /**
  75  * init_gfs2_fs - Register GFS2 as a filesystem
  76  *
  77  * Returns: 0 on success, error code on failure
  78  */
  79
  80 static int __init init_gfs2_fs(void)
  81 {
  82         int error;
  83
  84         gfs2_str2qstr(&gfs2_qdot, ".");
  85         gfs2_str2qstr(&gfs2_qdotdot, "..");
  86         gfs2_quota_hash_init();
  87
  88         error = gfs2_sys_init();
  89         if (error)
  90                 return error;
  91
  92         error = list_lru_init(&gfs2_qd_lru);
  93         if (error)
  94                 goto fail_lru;
  95
  96         error = gfs2_glock_init();
  97         if (error)
  98                 goto fail_glock;
  99
 100         error = -ENOMEM;
 101         gfs2_glock_cachep = kmem_cache_create("gfs2_glock",
 102                                               sizeof(struct gfs2_glock),
 103                                               0, 0,
 104                                               gfs2_init_glock_once);
 105         if (!gfs2_glock_cachep)
 106                 goto fail_cachep1;
 107
 108         gfs2_glock_aspace_cachep = kmem_cache_create("gfs2_glock(aspace)",
 109                                         sizeof(struct gfs2_glock) +
 110                                         sizeof(struct address_space),
 111                                         0, 0, gfs2_init_gl_aspace_once);
 112
 113         if (!gfs2_glock_aspace_cachep)
 114                 goto fail_cachep2;
 115
 116         gfs2_inode_cachep = kmem_cache_create("gfs2_inode",
 117                                               sizeof(struct gfs2_inode),
 118                                               0,  SLAB_RECLAIM_ACCOUNT|
 119                                                   SLAB_MEM_SPREAD|
 120                                                   SLAB_ACCOUNT,
 121                                               gfs2_init_inode_once);
 122         if (!gfs2_inode_cachep)
 123                 goto fail_cachep3;
 124
 125         gfs2_bufdata_cachep = kmem_cache_create("gfs2_bufdata",
 126                                                 sizeof(struct gfs2_bufdata),
 127                                                 0, 0, NULL);
 128         if (!gfs2_bufdata_cachep)
 129                 goto fail_cachep4;
 130
 131         gfs2_rgrpd_cachep = kmem_cache_create("gfs2_rgrpd",
 132                                               sizeof(struct gfs2_rgrpd),
 133                                               0, 0, NULL);
 134         if (!gfs2_rgrpd_cachep)
 135                 goto fail_cachep5;
 136
 137         gfs2_quotad_cachep = kmem_cache_create("gfs2_quotad",
 138                                                sizeof(struct gfs2_quota_data),
 139                                                0, 0, NULL);
 140         if (!gfs2_quotad_cachep)
 141                 goto fail_cachep6;
 142
 143         gfs2_qadata_cachep = kmem_cache_create("gfs2_qadata",
 144                                                sizeof(struct gfs2_qadata),
 145                                                0, 0, NULL);
 146         if (!gfs2_qadata_cachep)
 147                 goto fail_cachep7;
 148
 149         error = register_shrinker(&gfs2_qd_shrinker);
 150         if (error)
 151                 goto fail_shrinker;
 152
 153         error = register_filesystem(&gfs2_fs_type);
 154         if (error)
 155                 goto fail_fs1;
 156
 157         error = register_filesystem(&gfs2meta_fs_type);
 158         if (error)
 159                 goto fail_fs2;
 160
 161         error = -ENOMEM;
 162         gfs_recovery_wq = alloc_workqueue("gfs_recovery",
 163                                           WQ_MEM_RECLAIM | WQ_FREEZABLE, 0);
 164         if (!gfs_recovery_wq)
 165                 goto fail_wq1;
 166
 167         gfs2_control_wq = alloc_workqueue("gfs2_control",
 168                                           WQ_UNBOUND | WQ_FREEZABLE, 0);
 169         if (!gfs2_control_wq)
 170                 goto fail_wq2;
 171
 172         gfs2_freeze_wq = alloc_workqueue("freeze_workqueue", 0, 0);
 173
 174         if (!gfs2_freeze_wq)
 175                 goto fail_wq3;
 176
 177         gfs2_page_pool = mempool_create_page_pool(64, 0);
 178         if (!gfs2_page_pool)
 179                 goto fail_mempool;
 180
 181         error = gfs2_register_debugfs();
 182         if (error)
 183                 goto fail_debugfs;
 184
 185         pr_info("GFS2 installed\n");
 186
 187         return 0;
 188
 189 fail_debugfs:
 190         mempool_destroy(gfs2_page_pool);
 191 fail_mempool:
 192         destroy_workqueue(gfs2_freeze_wq);
 193 fail_wq3:
 194         destroy_workqueue(gfs2_control_wq);
 195 fail_wq2:
 196         destroy_workqueue(gfs_recovery_wq);
 197 fail_wq1:
 198         unregister_filesystem(&gfs2meta_fs_type);
 199 fail_fs2:
 200         unregister_filesystem(&gfs2_fs_type);
 201 fail_fs1:
 202         unregister_shrinker(&gfs2_qd_shrinker);
 203 fail_shrinker:
 204         kmem_cache_destroy(gfs2_qadata_cachep);
 205 fail_cachep7:
 206         kmem_cache_destroy(gfs2_quotad_cachep);
 207 fail_cachep6:
 208         kmem_cache_destroy(gfs2_rgrpd_cachep);
 209 fail_cachep5:
 210         kmem_cache_destroy(gfs2_bufdata_cachep);
 211 fail_cachep4:
 212         kmem_cache_destroy(gfs2_inode_cachep);
 213 fail_cachep3:
 214         kmem_cache_destroy(gfs2_glock_aspace_cachep);
 215 fail_cachep2:
 216         kmem_cache_destroy(gfs2_glock_cachep);
 217 fail_cachep1:
 218         gfs2_glock_exit();
 219 fail_glock:
 220         list_lru_destroy(&gfs2_qd_lru);
 221 fail_lru:
 222         gfs2_sys_uninit();
 223         return error;
 224 }
 225
 226 /**
 227  * exit_gfs2_fs - Unregister the file system
 228  *
 229  */
 230
 231 static void __exit exit_gfs2_fs(void)
 232 {
 233         unregister_shrinker(&gfs2_qd_shrinker);
 234         gfs2_glock_exit();
 235         gfs2_unregister_debugfs();
 236         unregister_filesystem(&gfs2_fs_type);
 237         unregister_filesystem(&gfs2meta_fs_type);
 238         destroy_workqueue(gfs_recovery_wq);
 239         destroy_workqueue(gfs2_control_wq);
 240         destroy_workqueue(gfs2_freeze_wq);
 241         list_lru_destroy(&gfs2_qd_lru);
 242
 243         rcu_barrier();
 244
 245         mempool_destroy(gfs2_page_pool);
 246         kmem_cache_destroy(gfs2_qadata_cachep);
 247         kmem_cache_destroy(gfs2_quotad_cachep);
 248         kmem_cache_destroy(gfs2_rgrpd_cachep);
 249         kmem_cache_destroy(gfs2_bufdata_cachep);
 250         kmem_cache_destroy(gfs2_inode_cachep);
 251         kmem_cache_destroy(gfs2_glock_aspace_cachep);
 252         kmem_cache_destroy(gfs2_glock_cachep);
 253
 254         gfs2_sys_uninit();
 255 }
 256
 257 MODULE_DESCRIPTION("Global File System");
 258 MODULE_AUTHOR("Red Hat, Inc.");
 259 MODULE_LICENSE("GPL");
 260
 261 module_init(init_gfs2_fs);
 262 module_exit(exit_gfs2_fs);
 263