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 #include <linux/slab.h> 11 #include <linux/spinlock.h> 12 #include <linux/completion.h> 13 #include <linux/buffer_head.h> 14 #include <linux/module.h> 15 #include <linux/init.h> 16 #include <linux/gfs2_ondisk.h> 17 #include <linux/rcupdate.h> 18 #include <linux/rculist_bl.h> 19 #include <linux/atomic.h> 20 21 #include "gfs2.h" 22 #include "incore.h" 23 #include "super.h" 24 #include "sys.h" 25 #include "util.h" 26 #include "glock.h" 27 #include "quota.h" 28 #include "recovery.h" 29 #include "dir.h" 30 31 struct workqueue_struct *gfs2_control_wq; 32 33 static struct shrinker qd_shrinker = { 34 .shrink = gfs2_shrink_qd_memory, 35 .seeks = DEFAULT_SEEKS, 36 }; 37 38 static void gfs2_init_inode_once(void *foo) 39 { 40 struct gfs2_inode *ip = foo; 41 42 inode_init_once(&ip->i_inode); 43 init_rwsem(&ip->i_rw_mutex); 44 INIT_LIST_HEAD(&ip->i_trunc_list); 45 ip->i_qadata = NULL; 46 ip->i_res = NULL; 47 ip->i_hash_cache = NULL; 48 } 49 50 static void gfs2_init_glock_once(void *foo) 51 { 52 struct gfs2_glock *gl = foo; 53 54 INIT_HLIST_BL_NODE(&gl->gl_list); 55 spin_lock_init(&gl->gl_spin); 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 85 error = gfs2_sys_init(); 86 if (error) 87 return error; 88 89 error = gfs2_glock_init(); 90 if (error) 91 goto fail; 92 93 error = -ENOMEM; 94 gfs2_glock_cachep = kmem_cache_create("gfs2_glock", 95 sizeof(struct gfs2_glock), 96 0, 0, 97 gfs2_init_glock_once); 98 if (!gfs2_glock_cachep) 99 goto fail; 100 101 gfs2_glock_aspace_cachep = kmem_cache_create("gfs2_glock(aspace)", 102 sizeof(struct gfs2_glock) + 103 sizeof(struct address_space), 104 0, 0, gfs2_init_gl_aspace_once); 105 106 if (!gfs2_glock_aspace_cachep) 107 goto fail; 108 109 gfs2_inode_cachep = kmem_cache_create("gfs2_inode", 110 sizeof(struct gfs2_inode), 111 0, SLAB_RECLAIM_ACCOUNT| 112 SLAB_MEM_SPREAD, 113 gfs2_init_inode_once); 114 if (!gfs2_inode_cachep) 115 goto fail; 116 117 gfs2_bufdata_cachep = kmem_cache_create("gfs2_bufdata", 118 sizeof(struct gfs2_bufdata), 119 0, 0, NULL); 120 if (!gfs2_bufdata_cachep) 121 goto fail; 122 123 gfs2_rgrpd_cachep = kmem_cache_create("gfs2_rgrpd", 124 sizeof(struct gfs2_rgrpd), 125 0, 0, NULL); 126 if (!gfs2_rgrpd_cachep) 127 goto fail; 128 129 gfs2_quotad_cachep = kmem_cache_create("gfs2_quotad", 130 sizeof(struct gfs2_quota_data), 131 0, 0, NULL); 132 if (!gfs2_quotad_cachep) 133 goto fail; 134 135 register_shrinker(&qd_shrinker); 136 137 error = register_filesystem(&gfs2_fs_type); 138 if (error) 139 goto fail; 140 141 error = register_filesystem(&gfs2meta_fs_type); 142 if (error) 143 goto fail_unregister; 144 145 error = -ENOMEM; 146 gfs_recovery_wq = alloc_workqueue("gfs_recovery", 147 WQ_MEM_RECLAIM | WQ_FREEZABLE, 0); 148 if (!gfs_recovery_wq) 149 goto fail_wq; 150 151 gfs2_control_wq = alloc_workqueue("gfs2_control", 152 WQ_NON_REENTRANT | WQ_UNBOUND | WQ_FREEZABLE, 0); 153 if (!gfs2_control_wq) 154 goto fail_control; 155 156 gfs2_register_debugfs(); 157 158 printk("GFS2 installed\n"); 159 160 return 0; 161 162 fail_control: 163 destroy_workqueue(gfs_recovery_wq); 164 fail_wq: 165 unregister_filesystem(&gfs2meta_fs_type); 166 fail_unregister: 167 unregister_filesystem(&gfs2_fs_type); 168 fail: 169 unregister_shrinker(&qd_shrinker); 170 gfs2_glock_exit(); 171 172 if (gfs2_quotad_cachep) 173 kmem_cache_destroy(gfs2_quotad_cachep); 174 175 if (gfs2_rgrpd_cachep) 176 kmem_cache_destroy(gfs2_rgrpd_cachep); 177 178 if (gfs2_bufdata_cachep) 179 kmem_cache_destroy(gfs2_bufdata_cachep); 180 181 if (gfs2_inode_cachep) 182 kmem_cache_destroy(gfs2_inode_cachep); 183 184 if (gfs2_glock_aspace_cachep) 185 kmem_cache_destroy(gfs2_glock_aspace_cachep); 186 187 if (gfs2_glock_cachep) 188 kmem_cache_destroy(gfs2_glock_cachep); 189 190 gfs2_sys_uninit(); 191 return error; 192 } 193 194 /** 195 * exit_gfs2_fs - Unregister the file system 196 * 197 */ 198 199 static void __exit exit_gfs2_fs(void) 200 { 201 unregister_shrinker(&qd_shrinker); 202 gfs2_glock_exit(); 203 gfs2_unregister_debugfs(); 204 unregister_filesystem(&gfs2_fs_type); 205 unregister_filesystem(&gfs2meta_fs_type); 206 destroy_workqueue(gfs_recovery_wq); 207 destroy_workqueue(gfs2_control_wq); 208 209 rcu_barrier(); 210 211 kmem_cache_destroy(gfs2_quotad_cachep); 212 kmem_cache_destroy(gfs2_rgrpd_cachep); 213 kmem_cache_destroy(gfs2_bufdata_cachep); 214 kmem_cache_destroy(gfs2_inode_cachep); 215 kmem_cache_destroy(gfs2_glock_aspace_cachep); 216 kmem_cache_destroy(gfs2_glock_cachep); 217 218 gfs2_sys_uninit(); 219 } 220 221 MODULE_DESCRIPTION("Global File System"); 222 MODULE_AUTHOR("Red Hat, Inc."); 223 MODULE_LICENSE("GPL"); 224 225 module_init(init_gfs2_fs); 226 module_exit(exit_gfs2_fs); 227 228