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 34 struct workqueue_struct *gfs2_control_wq; 35 36 static void gfs2_init_inode_once(void *foo) 37 { 38 struct gfs2_inode *ip = foo; 39 40 inode_init_once(&ip->i_inode); 41 init_rwsem(&ip->i_rw_mutex); 42 INIT_LIST_HEAD(&ip->i_trunc_list); 43 ip->i_res = NULL; 44 ip->i_hash_cache = NULL; 45 } 46 47 static void gfs2_init_glock_once(void *foo) 48 { 49 struct gfs2_glock *gl = foo; 50 51 INIT_HLIST_BL_NODE(&gl->gl_list); 52 spin_lock_init(&gl->gl_spin); 53 INIT_LIST_HEAD(&gl->gl_holders); 54 INIT_LIST_HEAD(&gl->gl_lru); 55 INIT_LIST_HEAD(&gl->gl_ail_list); 56 atomic_set(&gl->gl_ail_count, 0); 57 atomic_set(&gl->gl_revokes, 0); 58 } 59 60 static void gfs2_init_gl_aspace_once(void *foo) 61 { 62 struct gfs2_glock *gl = foo; 63 struct address_space *mapping = (struct address_space *)(gl + 1); 64 65 gfs2_init_glock_once(gl); 66 address_space_init_once(mapping); 67 } 68 69 /** 70 * init_gfs2_fs - Register GFS2 as a filesystem 71 * 72 * Returns: 0 on success, error code on failure 73 */ 74 75 static int __init init_gfs2_fs(void) 76 { 77 int error; 78 79 gfs2_str2qstr(&gfs2_qdot, "."); 80 gfs2_str2qstr(&gfs2_qdotdot, ".."); 81 gfs2_quota_hash_init(); 82 83 error = gfs2_sys_init(); 84 if (error) 85 return error; 86 87 error = list_lru_init(&gfs2_qd_lru); 88 if (error) 89 goto fail_lru; 90 91 error = gfs2_glock_init(); 92 if (error) 93 goto fail; 94 95 error = -ENOMEM; 96 gfs2_glock_cachep = kmem_cache_create("gfs2_glock", 97 sizeof(struct gfs2_glock), 98 0, 0, 99 gfs2_init_glock_once); 100 if (!gfs2_glock_cachep) 101 goto fail; 102 103 gfs2_glock_aspace_cachep = kmem_cache_create("gfs2_glock(aspace)", 104 sizeof(struct gfs2_glock) + 105 sizeof(struct address_space), 106 0, 0, gfs2_init_gl_aspace_once); 107 108 if (!gfs2_glock_aspace_cachep) 109 goto fail; 110 111 gfs2_inode_cachep = kmem_cache_create("gfs2_inode", 112 sizeof(struct gfs2_inode), 113 0, SLAB_RECLAIM_ACCOUNT| 114 SLAB_MEM_SPREAD, 115 gfs2_init_inode_once); 116 if (!gfs2_inode_cachep) 117 goto fail; 118 119 gfs2_bufdata_cachep = kmem_cache_create("gfs2_bufdata", 120 sizeof(struct gfs2_bufdata), 121 0, 0, NULL); 122 if (!gfs2_bufdata_cachep) 123 goto fail; 124 125 gfs2_rgrpd_cachep = kmem_cache_create("gfs2_rgrpd", 126 sizeof(struct gfs2_rgrpd), 127 0, 0, NULL); 128 if (!gfs2_rgrpd_cachep) 129 goto fail; 130 131 gfs2_quotad_cachep = kmem_cache_create("gfs2_quotad", 132 sizeof(struct gfs2_quota_data), 133 0, 0, NULL); 134 if (!gfs2_quotad_cachep) 135 goto fail; 136 137 gfs2_rsrv_cachep = kmem_cache_create("gfs2_mblk", 138 sizeof(struct gfs2_blkreserv), 139 0, 0, NULL); 140 if (!gfs2_rsrv_cachep) 141 goto fail; 142 143 register_shrinker(&gfs2_qd_shrinker); 144 145 error = register_filesystem(&gfs2_fs_type); 146 if (error) 147 goto fail; 148 149 error = register_filesystem(&gfs2meta_fs_type); 150 if (error) 151 goto fail_unregister; 152 153 error = -ENOMEM; 154 gfs_recovery_wq = alloc_workqueue("gfs_recovery", 155 WQ_MEM_RECLAIM | WQ_FREEZABLE, 0); 156 if (!gfs_recovery_wq) 157 goto fail_wq; 158 159 gfs2_control_wq = alloc_workqueue("gfs2_control", 160 WQ_UNBOUND | WQ_FREEZABLE, 0); 161 if (!gfs2_control_wq) 162 goto fail_recovery; 163 164 gfs2_page_pool = mempool_create_page_pool(64, 0); 165 if (!gfs2_page_pool) 166 goto fail_control; 167 168 gfs2_register_debugfs(); 169 170 pr_info("GFS2 installed\n"); 171 172 return 0; 173 174 fail_control: 175 destroy_workqueue(gfs2_control_wq); 176 fail_recovery: 177 destroy_workqueue(gfs_recovery_wq); 178 fail_wq: 179 unregister_filesystem(&gfs2meta_fs_type); 180 fail_unregister: 181 unregister_filesystem(&gfs2_fs_type); 182 fail: 183 list_lru_destroy(&gfs2_qd_lru); 184 fail_lru: 185 unregister_shrinker(&gfs2_qd_shrinker); 186 gfs2_glock_exit(); 187 188 if (gfs2_rsrv_cachep) 189 kmem_cache_destroy(gfs2_rsrv_cachep); 190 191 if (gfs2_quotad_cachep) 192 kmem_cache_destroy(gfs2_quotad_cachep); 193 194 if (gfs2_rgrpd_cachep) 195 kmem_cache_destroy(gfs2_rgrpd_cachep); 196 197 if (gfs2_bufdata_cachep) 198 kmem_cache_destroy(gfs2_bufdata_cachep); 199 200 if (gfs2_inode_cachep) 201 kmem_cache_destroy(gfs2_inode_cachep); 202 203 if (gfs2_glock_aspace_cachep) 204 kmem_cache_destroy(gfs2_glock_aspace_cachep); 205 206 if (gfs2_glock_cachep) 207 kmem_cache_destroy(gfs2_glock_cachep); 208 209 gfs2_sys_uninit(); 210 return error; 211 } 212 213 /** 214 * exit_gfs2_fs - Unregister the file system 215 * 216 */ 217 218 static void __exit exit_gfs2_fs(void) 219 { 220 unregister_shrinker(&gfs2_qd_shrinker); 221 gfs2_glock_exit(); 222 gfs2_unregister_debugfs(); 223 unregister_filesystem(&gfs2_fs_type); 224 unregister_filesystem(&gfs2meta_fs_type); 225 destroy_workqueue(gfs_recovery_wq); 226 destroy_workqueue(gfs2_control_wq); 227 list_lru_destroy(&gfs2_qd_lru); 228 229 rcu_barrier(); 230 231 mempool_destroy(gfs2_page_pool); 232 kmem_cache_destroy(gfs2_rsrv_cachep); 233 kmem_cache_destroy(gfs2_quotad_cachep); 234 kmem_cache_destroy(gfs2_rgrpd_cachep); 235 kmem_cache_destroy(gfs2_bufdata_cachep); 236 kmem_cache_destroy(gfs2_inode_cachep); 237 kmem_cache_destroy(gfs2_glock_aspace_cachep); 238 kmem_cache_destroy(gfs2_glock_cachep); 239 240 gfs2_sys_uninit(); 241 } 242 243 MODULE_DESCRIPTION("Global File System"); 244 MODULE_AUTHOR("Red Hat, Inc."); 245 MODULE_LICENSE("GPL"); 246 247 module_init(init_gfs2_fs); 248 module_exit(exit_gfs2_fs); 249 250