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 init_rwsem(&ip->i_rw_mutex); 43 INIT_LIST_HEAD(&ip->i_trunc_list); 44 ip->i_qadata = NULL; 45 memset(&ip->i_res, 0, sizeof(ip->i_res)); 46 RB_CLEAR_NODE(&ip->i_res.rs_node); 47 ip->i_hash_cache = NULL; 48 gfs2_holder_mark_uninitialized(&ip->i_iopen_gh); 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_lockref.lock); 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 gfs2_quota_hash_init(); 86 87 error = gfs2_sys_init(); 88 if (error) 89 return error; 90 91 error = list_lru_init(&gfs2_qd_lru); 92 if (error) 93 goto fail_lru; 94 95 error = gfs2_glock_init(); 96 if (error) 97 goto fail; 98 99 error = -ENOMEM; 100 gfs2_glock_cachep = kmem_cache_create("gfs2_glock", 101 sizeof(struct gfs2_glock), 102 0, 0, 103 gfs2_init_glock_once); 104 if (!gfs2_glock_cachep) 105 goto fail; 106 107 gfs2_glock_aspace_cachep = kmem_cache_create("gfs2_glock(aspace)", 108 sizeof(struct gfs2_glock) + 109 sizeof(struct address_space), 110 0, 0, gfs2_init_gl_aspace_once); 111 112 if (!gfs2_glock_aspace_cachep) 113 goto fail; 114 115 gfs2_inode_cachep = kmem_cache_create("gfs2_inode", 116 sizeof(struct gfs2_inode), 117 0, SLAB_RECLAIM_ACCOUNT| 118 SLAB_MEM_SPREAD| 119 SLAB_ACCOUNT, 120 gfs2_init_inode_once); 121 if (!gfs2_inode_cachep) 122 goto fail; 123 124 gfs2_bufdata_cachep = kmem_cache_create("gfs2_bufdata", 125 sizeof(struct gfs2_bufdata), 126 0, 0, NULL); 127 if (!gfs2_bufdata_cachep) 128 goto fail; 129 130 gfs2_rgrpd_cachep = kmem_cache_create("gfs2_rgrpd", 131 sizeof(struct gfs2_rgrpd), 132 0, 0, NULL); 133 if (!gfs2_rgrpd_cachep) 134 goto fail; 135 136 gfs2_quotad_cachep = kmem_cache_create("gfs2_quotad", 137 sizeof(struct gfs2_quota_data), 138 0, 0, NULL); 139 if (!gfs2_quotad_cachep) 140 goto fail; 141 142 gfs2_qadata_cachep = kmem_cache_create("gfs2_qadata", 143 sizeof(struct gfs2_qadata), 144 0, 0, NULL); 145 if (!gfs2_qadata_cachep) 146 goto fail; 147 148 register_shrinker(&gfs2_qd_shrinker); 149 150 error = register_filesystem(&gfs2_fs_type); 151 if (error) 152 goto fail; 153 154 error = register_filesystem(&gfs2meta_fs_type); 155 if (error) 156 goto fail_unregister; 157 158 error = -ENOMEM; 159 gfs_recovery_wq = alloc_workqueue("gfs_recovery", 160 WQ_MEM_RECLAIM | WQ_FREEZABLE, 0); 161 if (!gfs_recovery_wq) 162 goto fail_wq; 163 164 gfs2_control_wq = alloc_workqueue("gfs2_control", 165 WQ_UNBOUND | WQ_FREEZABLE, 0); 166 if (!gfs2_control_wq) 167 goto fail_recovery; 168 169 gfs2_freeze_wq = alloc_workqueue("freeze_workqueue", 0, 0); 170 171 if (!gfs2_freeze_wq) 172 goto fail_control; 173 174 gfs2_page_pool = mempool_create_page_pool(64, 0); 175 if (!gfs2_page_pool) 176 goto fail_freeze; 177 178 gfs2_register_debugfs(); 179 180 pr_info("GFS2 installed\n"); 181 182 return 0; 183 184 fail_freeze: 185 destroy_workqueue(gfs2_freeze_wq); 186 fail_control: 187 destroy_workqueue(gfs2_control_wq); 188 fail_recovery: 189 destroy_workqueue(gfs_recovery_wq); 190 fail_wq: 191 unregister_filesystem(&gfs2meta_fs_type); 192 fail_unregister: 193 unregister_filesystem(&gfs2_fs_type); 194 fail: 195 list_lru_destroy(&gfs2_qd_lru); 196 fail_lru: 197 unregister_shrinker(&gfs2_qd_shrinker); 198 gfs2_glock_exit(); 199 200 if (gfs2_qadata_cachep) 201 kmem_cache_destroy(gfs2_qadata_cachep); 202 203 if (gfs2_quotad_cachep) 204 kmem_cache_destroy(gfs2_quotad_cachep); 205 206 if (gfs2_rgrpd_cachep) 207 kmem_cache_destroy(gfs2_rgrpd_cachep); 208 209 if (gfs2_bufdata_cachep) 210 kmem_cache_destroy(gfs2_bufdata_cachep); 211 212 if (gfs2_inode_cachep) 213 kmem_cache_destroy(gfs2_inode_cachep); 214 215 if (gfs2_glock_aspace_cachep) 216 kmem_cache_destroy(gfs2_glock_aspace_cachep); 217 218 if (gfs2_glock_cachep) 219 kmem_cache_destroy(gfs2_glock_cachep); 220 221 gfs2_sys_uninit(); 222 return error; 223 } 224 225 /** 226 * exit_gfs2_fs - Unregister the file system 227 * 228 */ 229 230 static void __exit exit_gfs2_fs(void) 231 { 232 unregister_shrinker(&gfs2_qd_shrinker); 233 gfs2_glock_exit(); 234 gfs2_unregister_debugfs(); 235 unregister_filesystem(&gfs2_fs_type); 236 unregister_filesystem(&gfs2meta_fs_type); 237 destroy_workqueue(gfs_recovery_wq); 238 destroy_workqueue(gfs2_control_wq); 239 destroy_workqueue(gfs2_freeze_wq); 240 list_lru_destroy(&gfs2_qd_lru); 241 242 rcu_barrier(); 243 244 mempool_destroy(gfs2_page_pool); 245 kmem_cache_destroy(gfs2_qadata_cachep); 246 kmem_cache_destroy(gfs2_quotad_cachep); 247 kmem_cache_destroy(gfs2_rgrpd_cachep); 248 kmem_cache_destroy(gfs2_bufdata_cachep); 249 kmem_cache_destroy(gfs2_inode_cachep); 250 kmem_cache_destroy(gfs2_glock_aspace_cachep); 251 kmem_cache_destroy(gfs2_glock_cachep); 252 253 gfs2_sys_uninit(); 254 } 255 256 MODULE_DESCRIPTION("Global File System"); 257 MODULE_AUTHOR("Red Hat, Inc."); 258 MODULE_LICENSE("GPL"); 259 260 module_init(init_gfs2_fs); 261 module_exit(exit_gfs2_fs); 262 263