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_res = NULL; 45 ip->i_hash_cache = NULL; 46 } 47 48 static void gfs2_init_glock_once(void *foo) 49 { 50 struct gfs2_glock *gl = foo; 51 52 INIT_HLIST_BL_NODE(&gl->gl_list); 53 spin_lock_init(&gl->gl_lockref.lock); 54 INIT_LIST_HEAD(&gl->gl_holders); 55 INIT_LIST_HEAD(&gl->gl_lru); 56 INIT_LIST_HEAD(&gl->gl_ail_list); 57 atomic_set(&gl->gl_ail_count, 0); 58 atomic_set(&gl->gl_revokes, 0); 59 } 60 61 static void gfs2_init_gl_aspace_once(void *foo) 62 { 63 struct gfs2_glock *gl = foo; 64 struct address_space *mapping = (struct address_space *)(gl + 1); 65 66 gfs2_init_glock_once(gl); 67 address_space_init_once(mapping); 68 } 69 70 /** 71 * init_gfs2_fs - Register GFS2 as a filesystem 72 * 73 * Returns: 0 on success, error code on failure 74 */ 75 76 static int __init init_gfs2_fs(void) 77 { 78 int error; 79 80 gfs2_str2qstr(&gfs2_qdot, "."); 81 gfs2_str2qstr(&gfs2_qdotdot, ".."); 82 gfs2_quota_hash_init(); 83 84 error = gfs2_sys_init(); 85 if (error) 86 return error; 87 88 error = list_lru_init(&gfs2_qd_lru); 89 if (error) 90 goto fail_lru; 91 92 error = gfs2_glock_init(); 93 if (error) 94 goto fail; 95 96 error = -ENOMEM; 97 gfs2_glock_cachep = kmem_cache_create("gfs2_glock", 98 sizeof(struct gfs2_glock), 99 0, 0, 100 gfs2_init_glock_once); 101 if (!gfs2_glock_cachep) 102 goto fail; 103 104 gfs2_glock_aspace_cachep = kmem_cache_create("gfs2_glock(aspace)", 105 sizeof(struct gfs2_glock) + 106 sizeof(struct address_space), 107 0, 0, gfs2_init_gl_aspace_once); 108 109 if (!gfs2_glock_aspace_cachep) 110 goto fail; 111 112 gfs2_inode_cachep = kmem_cache_create("gfs2_inode", 113 sizeof(struct gfs2_inode), 114 0, SLAB_RECLAIM_ACCOUNT| 115 SLAB_MEM_SPREAD, 116 gfs2_init_inode_once); 117 if (!gfs2_inode_cachep) 118 goto fail; 119 120 gfs2_bufdata_cachep = kmem_cache_create("gfs2_bufdata", 121 sizeof(struct gfs2_bufdata), 122 0, 0, NULL); 123 if (!gfs2_bufdata_cachep) 124 goto fail; 125 126 gfs2_rgrpd_cachep = kmem_cache_create("gfs2_rgrpd", 127 sizeof(struct gfs2_rgrpd), 128 0, 0, NULL); 129 if (!gfs2_rgrpd_cachep) 130 goto fail; 131 132 gfs2_quotad_cachep = kmem_cache_create("gfs2_quotad", 133 sizeof(struct gfs2_quota_data), 134 0, 0, NULL); 135 if (!gfs2_quotad_cachep) 136 goto fail; 137 138 gfs2_rsrv_cachep = kmem_cache_create("gfs2_mblk", 139 sizeof(struct gfs2_blkreserv), 140 0, 0, NULL); 141 if (!gfs2_rsrv_cachep) 142 goto fail; 143 144 register_shrinker(&gfs2_qd_shrinker); 145 146 error = register_filesystem(&gfs2_fs_type); 147 if (error) 148 goto fail; 149 150 error = register_filesystem(&gfs2meta_fs_type); 151 if (error) 152 goto fail_unregister; 153 154 error = -ENOMEM; 155 gfs_recovery_wq = alloc_workqueue("gfs_recovery", 156 WQ_MEM_RECLAIM | WQ_FREEZABLE, 0); 157 if (!gfs_recovery_wq) 158 goto fail_wq; 159 160 gfs2_control_wq = alloc_workqueue("gfs2_control", 161 WQ_UNBOUND | WQ_FREEZABLE, 0); 162 if (!gfs2_control_wq) 163 goto fail_recovery; 164 165 gfs2_freeze_wq = alloc_workqueue("freeze_workqueue", 0, 0); 166 167 if (!gfs2_freeze_wq) 168 goto fail_control; 169 170 gfs2_page_pool = mempool_create_page_pool(64, 0); 171 if (!gfs2_page_pool) 172 goto fail_freeze; 173 174 gfs2_register_debugfs(); 175 176 pr_info("GFS2 installed\n"); 177 178 return 0; 179 180 fail_freeze: 181 destroy_workqueue(gfs2_freeze_wq); 182 fail_control: 183 destroy_workqueue(gfs2_control_wq); 184 fail_recovery: 185 destroy_workqueue(gfs_recovery_wq); 186 fail_wq: 187 unregister_filesystem(&gfs2meta_fs_type); 188 fail_unregister: 189 unregister_filesystem(&gfs2_fs_type); 190 fail: 191 list_lru_destroy(&gfs2_qd_lru); 192 fail_lru: 193 unregister_shrinker(&gfs2_qd_shrinker); 194 gfs2_glock_exit(); 195 196 if (gfs2_rsrv_cachep) 197 kmem_cache_destroy(gfs2_rsrv_cachep); 198 199 if (gfs2_quotad_cachep) 200 kmem_cache_destroy(gfs2_quotad_cachep); 201 202 if (gfs2_rgrpd_cachep) 203 kmem_cache_destroy(gfs2_rgrpd_cachep); 204 205 if (gfs2_bufdata_cachep) 206 kmem_cache_destroy(gfs2_bufdata_cachep); 207 208 if (gfs2_inode_cachep) 209 kmem_cache_destroy(gfs2_inode_cachep); 210 211 if (gfs2_glock_aspace_cachep) 212 kmem_cache_destroy(gfs2_glock_aspace_cachep); 213 214 if (gfs2_glock_cachep) 215 kmem_cache_destroy(gfs2_glock_cachep); 216 217 gfs2_sys_uninit(); 218 return error; 219 } 220 221 /** 222 * exit_gfs2_fs - Unregister the file system 223 * 224 */ 225 226 static void __exit exit_gfs2_fs(void) 227 { 228 unregister_shrinker(&gfs2_qd_shrinker); 229 gfs2_glock_exit(); 230 gfs2_unregister_debugfs(); 231 unregister_filesystem(&gfs2_fs_type); 232 unregister_filesystem(&gfs2meta_fs_type); 233 destroy_workqueue(gfs_recovery_wq); 234 destroy_workqueue(gfs2_control_wq); 235 destroy_workqueue(gfs2_freeze_wq); 236 list_lru_destroy(&gfs2_qd_lru); 237 238 rcu_barrier(); 239 240 mempool_destroy(gfs2_page_pool); 241 kmem_cache_destroy(gfs2_rsrv_cachep); 242 kmem_cache_destroy(gfs2_quotad_cachep); 243 kmem_cache_destroy(gfs2_rgrpd_cachep); 244 kmem_cache_destroy(gfs2_bufdata_cachep); 245 kmem_cache_destroy(gfs2_inode_cachep); 246 kmem_cache_destroy(gfs2_glock_aspace_cachep); 247 kmem_cache_destroy(gfs2_glock_cachep); 248 249 gfs2_sys_uninit(); 250 } 251 252 MODULE_DESCRIPTION("Global File System"); 253 MODULE_AUTHOR("Red Hat, Inc."); 254 MODULE_LICENSE("GPL"); 255 256 module_init(init_gfs2_fs); 257 module_exit(exit_gfs2_fs); 258 259