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 spin_lock_init(&gl->gl_lockref.lock); 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 gfs2_quota_hash_init(); 85 86 error = gfs2_sys_init(); 87 if (error) 88 return error; 89 90 error = list_lru_init(&gfs2_qd_lru); 91 if (error) 92 goto fail_lru; 93 94 error = gfs2_glock_init(); 95 if (error) 96 goto fail_glock; 97 98 error = -ENOMEM; 99 gfs2_glock_cachep = kmem_cache_create("gfs2_glock", 100 sizeof(struct gfs2_glock), 101 0, 0, 102 gfs2_init_glock_once); 103 if (!gfs2_glock_cachep) 104 goto fail_cachep1; 105 106 gfs2_glock_aspace_cachep = kmem_cache_create("gfs2_glock(aspace)", 107 sizeof(struct gfs2_glock) + 108 sizeof(struct address_space), 109 0, 0, gfs2_init_gl_aspace_once); 110 111 if (!gfs2_glock_aspace_cachep) 112 goto fail_cachep2; 113 114 gfs2_inode_cachep = kmem_cache_create("gfs2_inode", 115 sizeof(struct gfs2_inode), 116 0, SLAB_RECLAIM_ACCOUNT| 117 SLAB_MEM_SPREAD| 118 SLAB_ACCOUNT, 119 gfs2_init_inode_once); 120 if (!gfs2_inode_cachep) 121 goto fail_cachep3; 122 123 gfs2_bufdata_cachep = kmem_cache_create("gfs2_bufdata", 124 sizeof(struct gfs2_bufdata), 125 0, 0, NULL); 126 if (!gfs2_bufdata_cachep) 127 goto fail_cachep4; 128 129 gfs2_rgrpd_cachep = kmem_cache_create("gfs2_rgrpd", 130 sizeof(struct gfs2_rgrpd), 131 0, 0, NULL); 132 if (!gfs2_rgrpd_cachep) 133 goto fail_cachep5; 134 135 gfs2_quotad_cachep = kmem_cache_create("gfs2_quotad", 136 sizeof(struct gfs2_quota_data), 137 0, 0, NULL); 138 if (!gfs2_quotad_cachep) 139 goto fail_cachep6; 140 141 gfs2_qadata_cachep = kmem_cache_create("gfs2_qadata", 142 sizeof(struct gfs2_qadata), 143 0, 0, NULL); 144 if (!gfs2_qadata_cachep) 145 goto fail_cachep7; 146 147 error = register_shrinker(&gfs2_qd_shrinker); 148 if (error) 149 goto fail_shrinker; 150 151 error = register_filesystem(&gfs2_fs_type); 152 if (error) 153 goto fail_fs1; 154 155 error = register_filesystem(&gfs2meta_fs_type); 156 if (error) 157 goto fail_fs2; 158 159 error = -ENOMEM; 160 gfs_recovery_wq = alloc_workqueue("gfs_recovery", 161 WQ_MEM_RECLAIM | WQ_FREEZABLE, 0); 162 if (!gfs_recovery_wq) 163 goto fail_wq1; 164 165 gfs2_control_wq = alloc_workqueue("gfs2_control", 166 WQ_UNBOUND | WQ_FREEZABLE, 0); 167 if (!gfs2_control_wq) 168 goto fail_wq2; 169 170 gfs2_freeze_wq = alloc_workqueue("freeze_workqueue", 0, 0); 171 172 if (!gfs2_freeze_wq) 173 goto fail_wq3; 174 175 gfs2_page_pool = mempool_create_page_pool(64, 0); 176 if (!gfs2_page_pool) 177 goto fail_mempool; 178 179 error = gfs2_register_debugfs(); 180 if (error) 181 goto fail_debugfs; 182 183 pr_info("GFS2 installed\n"); 184 185 return 0; 186 187 fail_debugfs: 188 mempool_destroy(gfs2_page_pool); 189 fail_mempool: 190 destroy_workqueue(gfs2_freeze_wq); 191 fail_wq3: 192 destroy_workqueue(gfs2_control_wq); 193 fail_wq2: 194 destroy_workqueue(gfs_recovery_wq); 195 fail_wq1: 196 unregister_filesystem(&gfs2meta_fs_type); 197 fail_fs2: 198 unregister_filesystem(&gfs2_fs_type); 199 fail_fs1: 200 unregister_shrinker(&gfs2_qd_shrinker); 201 fail_shrinker: 202 kmem_cache_destroy(gfs2_qadata_cachep); 203 fail_cachep7: 204 kmem_cache_destroy(gfs2_quotad_cachep); 205 fail_cachep6: 206 kmem_cache_destroy(gfs2_rgrpd_cachep); 207 fail_cachep5: 208 kmem_cache_destroy(gfs2_bufdata_cachep); 209 fail_cachep4: 210 kmem_cache_destroy(gfs2_inode_cachep); 211 fail_cachep3: 212 kmem_cache_destroy(gfs2_glock_aspace_cachep); 213 fail_cachep2: 214 kmem_cache_destroy(gfs2_glock_cachep); 215 fail_cachep1: 216 gfs2_glock_exit(); 217 fail_glock: 218 list_lru_destroy(&gfs2_qd_lru); 219 fail_lru: 220 gfs2_sys_uninit(); 221 return error; 222 } 223 224 /** 225 * exit_gfs2_fs - Unregister the file system 226 * 227 */ 228 229 static void __exit exit_gfs2_fs(void) 230 { 231 unregister_shrinker(&gfs2_qd_shrinker); 232 gfs2_glock_exit(); 233 gfs2_unregister_debugfs(); 234 unregister_filesystem(&gfs2_fs_type); 235 unregister_filesystem(&gfs2meta_fs_type); 236 destroy_workqueue(gfs_recovery_wq); 237 destroy_workqueue(gfs2_control_wq); 238 destroy_workqueue(gfs2_freeze_wq); 239 list_lru_destroy(&gfs2_qd_lru); 240 241 rcu_barrier(); 242 243 mempool_destroy(gfs2_page_pool); 244 kmem_cache_destroy(gfs2_qadata_cachep); 245 kmem_cache_destroy(gfs2_quotad_cachep); 246 kmem_cache_destroy(gfs2_rgrpd_cachep); 247 kmem_cache_destroy(gfs2_bufdata_cachep); 248 kmem_cache_destroy(gfs2_inode_cachep); 249 kmem_cache_destroy(gfs2_glock_aspace_cachep); 250 kmem_cache_destroy(gfs2_glock_cachep); 251 252 gfs2_sys_uninit(); 253 } 254 255 MODULE_DESCRIPTION("Global File System"); 256 MODULE_AUTHOR("Red Hat, Inc."); 257 MODULE_LICENSE("GPL"); 258 259 module_init(init_gfs2_fs); 260 module_exit(exit_gfs2_fs); 261 262