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 static struct shrinker qd_shrinker = { 32 .shrink = gfs2_shrink_qd_memory, 33 .seeks = DEFAULT_SEEKS, 34 }; 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_alloc = 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 82 error = gfs2_sys_init(); 83 if (error) 84 return error; 85 86 error = gfs2_glock_init(); 87 if (error) 88 goto fail; 89 90 error = -ENOMEM; 91 gfs2_glock_cachep = kmem_cache_create("gfs2_glock", 92 sizeof(struct gfs2_glock), 93 0, 0, 94 gfs2_init_glock_once); 95 if (!gfs2_glock_cachep) 96 goto fail; 97 98 gfs2_glock_aspace_cachep = kmem_cache_create("gfs2_glock(aspace)", 99 sizeof(struct gfs2_glock) + 100 sizeof(struct address_space), 101 0, 0, gfs2_init_gl_aspace_once); 102 103 if (!gfs2_glock_aspace_cachep) 104 goto fail; 105 106 gfs2_inode_cachep = kmem_cache_create("gfs2_inode", 107 sizeof(struct gfs2_inode), 108 0, SLAB_RECLAIM_ACCOUNT| 109 SLAB_MEM_SPREAD, 110 gfs2_init_inode_once); 111 if (!gfs2_inode_cachep) 112 goto fail; 113 114 gfs2_bufdata_cachep = kmem_cache_create("gfs2_bufdata", 115 sizeof(struct gfs2_bufdata), 116 0, 0, NULL); 117 if (!gfs2_bufdata_cachep) 118 goto fail; 119 120 gfs2_rgrpd_cachep = kmem_cache_create("gfs2_rgrpd", 121 sizeof(struct gfs2_rgrpd), 122 0, 0, NULL); 123 if (!gfs2_rgrpd_cachep) 124 goto fail; 125 126 gfs2_quotad_cachep = kmem_cache_create("gfs2_quotad", 127 sizeof(struct gfs2_quota_data), 128 0, 0, NULL); 129 if (!gfs2_quotad_cachep) 130 goto fail; 131 132 register_shrinker(&qd_shrinker); 133 134 error = register_filesystem(&gfs2_fs_type); 135 if (error) 136 goto fail; 137 138 error = register_filesystem(&gfs2meta_fs_type); 139 if (error) 140 goto fail_unregister; 141 142 error = -ENOMEM; 143 gfs_recovery_wq = alloc_workqueue("gfs_recovery", 144 WQ_MEM_RECLAIM | WQ_FREEZABLE, 0); 145 if (!gfs_recovery_wq) 146 goto fail_wq; 147 148 gfs2_register_debugfs(); 149 150 printk("GFS2 installed\n"); 151 152 return 0; 153 154 fail_wq: 155 unregister_filesystem(&gfs2meta_fs_type); 156 fail_unregister: 157 unregister_filesystem(&gfs2_fs_type); 158 fail: 159 unregister_shrinker(&qd_shrinker); 160 gfs2_glock_exit(); 161 162 if (gfs2_quotad_cachep) 163 kmem_cache_destroy(gfs2_quotad_cachep); 164 165 if (gfs2_rgrpd_cachep) 166 kmem_cache_destroy(gfs2_rgrpd_cachep); 167 168 if (gfs2_bufdata_cachep) 169 kmem_cache_destroy(gfs2_bufdata_cachep); 170 171 if (gfs2_inode_cachep) 172 kmem_cache_destroy(gfs2_inode_cachep); 173 174 if (gfs2_glock_aspace_cachep) 175 kmem_cache_destroy(gfs2_glock_aspace_cachep); 176 177 if (gfs2_glock_cachep) 178 kmem_cache_destroy(gfs2_glock_cachep); 179 180 gfs2_sys_uninit(); 181 return error; 182 } 183 184 /** 185 * exit_gfs2_fs - Unregister the file system 186 * 187 */ 188 189 static void __exit exit_gfs2_fs(void) 190 { 191 unregister_shrinker(&qd_shrinker); 192 gfs2_glock_exit(); 193 gfs2_unregister_debugfs(); 194 unregister_filesystem(&gfs2_fs_type); 195 unregister_filesystem(&gfs2meta_fs_type); 196 destroy_workqueue(gfs_recovery_wq); 197 198 rcu_barrier(); 199 200 kmem_cache_destroy(gfs2_quotad_cachep); 201 kmem_cache_destroy(gfs2_rgrpd_cachep); 202 kmem_cache_destroy(gfs2_bufdata_cachep); 203 kmem_cache_destroy(gfs2_inode_cachep); 204 kmem_cache_destroy(gfs2_glock_aspace_cachep); 205 kmem_cache_destroy(gfs2_glock_cachep); 206 207 gfs2_sys_uninit(); 208 } 209 210 MODULE_DESCRIPTION("Global File System"); 211 MODULE_AUTHOR("Red Hat, Inc."); 212 MODULE_LICENSE("GPL"); 213 214 module_init(init_gfs2_fs); 215 module_exit(exit_gfs2_fs); 216 217