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 atomic_set(&ip->i_sizehint, 0); 43 init_rwsem(&ip->i_rw_mutex); 44 INIT_LIST_HEAD(&ip->i_trunc_list); 45 ip->i_qadata = NULL; 46 gfs2_holder_mark_uninitialized(&ip->i_rgd_gh); 47 memset(&ip->i_res, 0, sizeof(ip->i_res)); 48 RB_CLEAR_NODE(&ip->i_res.rs_node); 49 ip->i_hash_cache = NULL; 50 gfs2_holder_mark_uninitialized(&ip->i_iopen_gh); 51 } 52 53 static void gfs2_init_glock_once(void *foo) 54 { 55 struct gfs2_glock *gl = foo; 56 57 spin_lock_init(&gl->gl_lockref.lock); 58 INIT_LIST_HEAD(&gl->gl_holders); 59 INIT_LIST_HEAD(&gl->gl_lru); 60 INIT_LIST_HEAD(&gl->gl_ail_list); 61 atomic_set(&gl->gl_ail_count, 0); 62 atomic_set(&gl->gl_revokes, 0); 63 } 64 65 static void gfs2_init_gl_aspace_once(void *foo) 66 { 67 struct gfs2_glock *gl = foo; 68 struct address_space *mapping = (struct address_space *)(gl + 1); 69 70 gfs2_init_glock_once(gl); 71 address_space_init_once(mapping); 72 } 73 74 /** 75 * init_gfs2_fs - Register GFS2 as a filesystem 76 * 77 * Returns: 0 on success, error code on failure 78 */ 79 80 static int __init init_gfs2_fs(void) 81 { 82 int error; 83 84 gfs2_str2qstr(&gfs2_qdot, "."); 85 gfs2_str2qstr(&gfs2_qdotdot, ".."); 86 gfs2_quota_hash_init(); 87 88 error = gfs2_sys_init(); 89 if (error) 90 return error; 91 92 error = list_lru_init(&gfs2_qd_lru); 93 if (error) 94 goto fail_lru; 95 96 error = gfs2_glock_init(); 97 if (error) 98 goto fail_glock; 99 100 error = -ENOMEM; 101 gfs2_glock_cachep = kmem_cache_create("gfs2_glock", 102 sizeof(struct gfs2_glock), 103 0, 0, 104 gfs2_init_glock_once); 105 if (!gfs2_glock_cachep) 106 goto fail_cachep1; 107 108 gfs2_glock_aspace_cachep = kmem_cache_create("gfs2_glock(aspace)", 109 sizeof(struct gfs2_glock) + 110 sizeof(struct address_space), 111 0, 0, gfs2_init_gl_aspace_once); 112 113 if (!gfs2_glock_aspace_cachep) 114 goto fail_cachep2; 115 116 gfs2_inode_cachep = kmem_cache_create("gfs2_inode", 117 sizeof(struct gfs2_inode), 118 0, SLAB_RECLAIM_ACCOUNT| 119 SLAB_MEM_SPREAD| 120 SLAB_ACCOUNT, 121 gfs2_init_inode_once); 122 if (!gfs2_inode_cachep) 123 goto fail_cachep3; 124 125 gfs2_bufdata_cachep = kmem_cache_create("gfs2_bufdata", 126 sizeof(struct gfs2_bufdata), 127 0, 0, NULL); 128 if (!gfs2_bufdata_cachep) 129 goto fail_cachep4; 130 131 gfs2_rgrpd_cachep = kmem_cache_create("gfs2_rgrpd", 132 sizeof(struct gfs2_rgrpd), 133 0, 0, NULL); 134 if (!gfs2_rgrpd_cachep) 135 goto fail_cachep5; 136 137 gfs2_quotad_cachep = kmem_cache_create("gfs2_quotad", 138 sizeof(struct gfs2_quota_data), 139 0, 0, NULL); 140 if (!gfs2_quotad_cachep) 141 goto fail_cachep6; 142 143 gfs2_qadata_cachep = kmem_cache_create("gfs2_qadata", 144 sizeof(struct gfs2_qadata), 145 0, 0, NULL); 146 if (!gfs2_qadata_cachep) 147 goto fail_cachep7; 148 149 error = register_shrinker(&gfs2_qd_shrinker); 150 if (error) 151 goto fail_shrinker; 152 153 error = register_filesystem(&gfs2_fs_type); 154 if (error) 155 goto fail_fs1; 156 157 error = register_filesystem(&gfs2meta_fs_type); 158 if (error) 159 goto fail_fs2; 160 161 error = -ENOMEM; 162 gfs_recovery_wq = alloc_workqueue("gfs_recovery", 163 WQ_MEM_RECLAIM | WQ_FREEZABLE, 0); 164 if (!gfs_recovery_wq) 165 goto fail_wq1; 166 167 gfs2_control_wq = alloc_workqueue("gfs2_control", 168 WQ_UNBOUND | WQ_FREEZABLE, 0); 169 if (!gfs2_control_wq) 170 goto fail_wq2; 171 172 gfs2_freeze_wq = alloc_workqueue("freeze_workqueue", 0, 0); 173 174 if (!gfs2_freeze_wq) 175 goto fail_wq3; 176 177 gfs2_page_pool = mempool_create_page_pool(64, 0); 178 if (!gfs2_page_pool) 179 goto fail_mempool; 180 181 error = gfs2_register_debugfs(); 182 if (error) 183 goto fail_debugfs; 184 185 pr_info("GFS2 installed\n"); 186 187 return 0; 188 189 fail_debugfs: 190 mempool_destroy(gfs2_page_pool); 191 fail_mempool: 192 destroy_workqueue(gfs2_freeze_wq); 193 fail_wq3: 194 destroy_workqueue(gfs2_control_wq); 195 fail_wq2: 196 destroy_workqueue(gfs_recovery_wq); 197 fail_wq1: 198 unregister_filesystem(&gfs2meta_fs_type); 199 fail_fs2: 200 unregister_filesystem(&gfs2_fs_type); 201 fail_fs1: 202 unregister_shrinker(&gfs2_qd_shrinker); 203 fail_shrinker: 204 kmem_cache_destroy(gfs2_qadata_cachep); 205 fail_cachep7: 206 kmem_cache_destroy(gfs2_quotad_cachep); 207 fail_cachep6: 208 kmem_cache_destroy(gfs2_rgrpd_cachep); 209 fail_cachep5: 210 kmem_cache_destroy(gfs2_bufdata_cachep); 211 fail_cachep4: 212 kmem_cache_destroy(gfs2_inode_cachep); 213 fail_cachep3: 214 kmem_cache_destroy(gfs2_glock_aspace_cachep); 215 fail_cachep2: 216 kmem_cache_destroy(gfs2_glock_cachep); 217 fail_cachep1: 218 gfs2_glock_exit(); 219 fail_glock: 220 list_lru_destroy(&gfs2_qd_lru); 221 fail_lru: 222 gfs2_sys_uninit(); 223 return error; 224 } 225 226 /** 227 * exit_gfs2_fs - Unregister the file system 228 * 229 */ 230 231 static void __exit exit_gfs2_fs(void) 232 { 233 unregister_shrinker(&gfs2_qd_shrinker); 234 gfs2_glock_exit(); 235 gfs2_unregister_debugfs(); 236 unregister_filesystem(&gfs2_fs_type); 237 unregister_filesystem(&gfs2meta_fs_type); 238 destroy_workqueue(gfs_recovery_wq); 239 destroy_workqueue(gfs2_control_wq); 240 destroy_workqueue(gfs2_freeze_wq); 241 list_lru_destroy(&gfs2_qd_lru); 242 243 rcu_barrier(); 244 245 mempool_destroy(gfs2_page_pool); 246 kmem_cache_destroy(gfs2_qadata_cachep); 247 kmem_cache_destroy(gfs2_quotad_cachep); 248 kmem_cache_destroy(gfs2_rgrpd_cachep); 249 kmem_cache_destroy(gfs2_bufdata_cachep); 250 kmem_cache_destroy(gfs2_inode_cachep); 251 kmem_cache_destroy(gfs2_glock_aspace_cachep); 252 kmem_cache_destroy(gfs2_glock_cachep); 253 254 gfs2_sys_uninit(); 255 } 256 257 MODULE_DESCRIPTION("Global File System"); 258 MODULE_AUTHOR("Red Hat, Inc."); 259 MODULE_LICENSE("GPL"); 260 261 module_init(init_gfs2_fs); 262 module_exit(exit_gfs2_fs); 263 264