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