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 error = register_shrinker(&gfs2_qd_shrinker); 149 if (error) 150 goto fail; 151 152 error = register_filesystem(&gfs2_fs_type); 153 if (error) 154 goto fail; 155 156 error = register_filesystem(&gfs2meta_fs_type); 157 if (error) 158 goto fail_unregister; 159 160 error = -ENOMEM; 161 gfs_recovery_wq = alloc_workqueue("gfs_recovery", 162 WQ_MEM_RECLAIM | WQ_FREEZABLE, 0); 163 if (!gfs_recovery_wq) 164 goto fail_wq; 165 166 gfs2_control_wq = alloc_workqueue("gfs2_control", 167 WQ_UNBOUND | WQ_FREEZABLE, 0); 168 if (!gfs2_control_wq) 169 goto fail_recovery; 170 171 gfs2_freeze_wq = alloc_workqueue("freeze_workqueue", 0, 0); 172 173 if (!gfs2_freeze_wq) 174 goto fail_control; 175 176 gfs2_page_pool = mempool_create_page_pool(64, 0); 177 if (!gfs2_page_pool) 178 goto fail_freeze; 179 180 gfs2_register_debugfs(); 181 182 pr_info("GFS2 installed\n"); 183 184 return 0; 185 186 fail_freeze: 187 destroy_workqueue(gfs2_freeze_wq); 188 fail_control: 189 destroy_workqueue(gfs2_control_wq); 190 fail_recovery: 191 destroy_workqueue(gfs_recovery_wq); 192 fail_wq: 193 unregister_filesystem(&gfs2meta_fs_type); 194 fail_unregister: 195 unregister_filesystem(&gfs2_fs_type); 196 fail: 197 list_lru_destroy(&gfs2_qd_lru); 198 fail_lru: 199 unregister_shrinker(&gfs2_qd_shrinker); 200 gfs2_glock_exit(); 201 202 if (gfs2_qadata_cachep) 203 kmem_cache_destroy(gfs2_qadata_cachep); 204 205 if (gfs2_quotad_cachep) 206 kmem_cache_destroy(gfs2_quotad_cachep); 207 208 if (gfs2_rgrpd_cachep) 209 kmem_cache_destroy(gfs2_rgrpd_cachep); 210 211 if (gfs2_bufdata_cachep) 212 kmem_cache_destroy(gfs2_bufdata_cachep); 213 214 if (gfs2_inode_cachep) 215 kmem_cache_destroy(gfs2_inode_cachep); 216 217 if (gfs2_glock_aspace_cachep) 218 kmem_cache_destroy(gfs2_glock_aspace_cachep); 219 220 if (gfs2_glock_cachep) 221 kmem_cache_destroy(gfs2_glock_cachep); 222 223 gfs2_sys_uninit(); 224 return error; 225 } 226 227 /** 228 * exit_gfs2_fs - Unregister the file system 229 * 230 */ 231 232 static void __exit exit_gfs2_fs(void) 233 { 234 unregister_shrinker(&gfs2_qd_shrinker); 235 gfs2_glock_exit(); 236 gfs2_unregister_debugfs(); 237 unregister_filesystem(&gfs2_fs_type); 238 unregister_filesystem(&gfs2meta_fs_type); 239 destroy_workqueue(gfs_recovery_wq); 240 destroy_workqueue(gfs2_control_wq); 241 destroy_workqueue(gfs2_freeze_wq); 242 list_lru_destroy(&gfs2_qd_lru); 243 244 rcu_barrier(); 245 246 mempool_destroy(gfs2_page_pool); 247 kmem_cache_destroy(gfs2_qadata_cachep); 248 kmem_cache_destroy(gfs2_quotad_cachep); 249 kmem_cache_destroy(gfs2_rgrpd_cachep); 250 kmem_cache_destroy(gfs2_bufdata_cachep); 251 kmem_cache_destroy(gfs2_inode_cachep); 252 kmem_cache_destroy(gfs2_glock_aspace_cachep); 253 kmem_cache_destroy(gfs2_glock_cachep); 254 255 gfs2_sys_uninit(); 256 } 257 258 MODULE_DESCRIPTION("Global File System"); 259 MODULE_AUTHOR("Red Hat, Inc."); 260 MODULE_LICENSE("GPL"); 261 262 module_init(init_gfs2_fs); 263 module_exit(exit_gfs2_fs); 264 265