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 #include <linux/mempool.h> 21 22 #include "gfs2.h" 23 #include "incore.h" 24 #include "super.h" 25 #include "sys.h" 26 #include "util.h" 27 #include "glock.h" 28 #include "quota.h" 29 #include "recovery.h" 30 #include "dir.h" 31 32 struct workqueue_struct *gfs2_control_wq; 33 34 static struct shrinker qd_shrinker = { 35 .shrink = gfs2_shrink_qd_memory, 36 .seeks = DEFAULT_SEEKS, 37 }; 38 39 static void gfs2_init_inode_once(void *foo) 40 { 41 struct gfs2_inode *ip = foo; 42 43 inode_init_once(&ip->i_inode); 44 init_rwsem(&ip->i_rw_mutex); 45 INIT_LIST_HEAD(&ip->i_trunc_list); 46 ip->i_qadata = NULL; 47 ip->i_res = NULL; 48 ip->i_hash_cache = NULL; 49 } 50 51 static void gfs2_init_glock_once(void *foo) 52 { 53 struct gfs2_glock *gl = foo; 54 55 INIT_HLIST_BL_NODE(&gl->gl_list); 56 spin_lock_init(&gl->gl_spin); 57 INIT_LIST_HEAD(&gl->gl_holders); 58 INIT_LIST_HEAD(&gl->gl_lru); 59 INIT_LIST_HEAD(&gl->gl_ail_list); 60 atomic_set(&gl->gl_ail_count, 0); 61 atomic_set(&gl->gl_revokes, 0); 62 } 63 64 static void gfs2_init_gl_aspace_once(void *foo) 65 { 66 struct gfs2_glock *gl = foo; 67 struct address_space *mapping = (struct address_space *)(gl + 1); 68 69 gfs2_init_glock_once(gl); 70 address_space_init_once(mapping); 71 } 72 73 static void *gfs2_bh_alloc(gfp_t mask, void *data) 74 { 75 return alloc_buffer_head(mask); 76 } 77 78 static void gfs2_bh_free(void *ptr, void *data) 79 { 80 return free_buffer_head(ptr); 81 } 82 83 /** 84 * init_gfs2_fs - Register GFS2 as a filesystem 85 * 86 * Returns: 0 on success, error code on failure 87 */ 88 89 static int __init init_gfs2_fs(void) 90 { 91 int error; 92 93 gfs2_str2qstr(&gfs2_qdot, "."); 94 gfs2_str2qstr(&gfs2_qdotdot, ".."); 95 96 error = gfs2_sys_init(); 97 if (error) 98 return error; 99 100 error = gfs2_glock_init(); 101 if (error) 102 goto fail; 103 104 error = -ENOMEM; 105 gfs2_glock_cachep = kmem_cache_create("gfs2_glock", 106 sizeof(struct gfs2_glock), 107 0, 0, 108 gfs2_init_glock_once); 109 if (!gfs2_glock_cachep) 110 goto fail; 111 112 gfs2_glock_aspace_cachep = kmem_cache_create("gfs2_glock(aspace)", 113 sizeof(struct gfs2_glock) + 114 sizeof(struct address_space), 115 0, 0, gfs2_init_gl_aspace_once); 116 117 if (!gfs2_glock_aspace_cachep) 118 goto fail; 119 120 gfs2_inode_cachep = kmem_cache_create("gfs2_inode", 121 sizeof(struct gfs2_inode), 122 0, SLAB_RECLAIM_ACCOUNT| 123 SLAB_MEM_SPREAD, 124 gfs2_init_inode_once); 125 if (!gfs2_inode_cachep) 126 goto fail; 127 128 gfs2_bufdata_cachep = kmem_cache_create("gfs2_bufdata", 129 sizeof(struct gfs2_bufdata), 130 0, 0, NULL); 131 if (!gfs2_bufdata_cachep) 132 goto fail; 133 134 gfs2_rgrpd_cachep = kmem_cache_create("gfs2_rgrpd", 135 sizeof(struct gfs2_rgrpd), 136 0, 0, NULL); 137 if (!gfs2_rgrpd_cachep) 138 goto fail; 139 140 gfs2_quotad_cachep = kmem_cache_create("gfs2_quotad", 141 sizeof(struct gfs2_quota_data), 142 0, 0, NULL); 143 if (!gfs2_quotad_cachep) 144 goto fail; 145 146 register_shrinker(&qd_shrinker); 147 148 error = register_filesystem(&gfs2_fs_type); 149 if (error) 150 goto fail; 151 152 error = register_filesystem(&gfs2meta_fs_type); 153 if (error) 154 goto fail_unregister; 155 156 error = -ENOMEM; 157 gfs_recovery_wq = alloc_workqueue("gfs_recovery", 158 WQ_MEM_RECLAIM | WQ_FREEZABLE, 0); 159 if (!gfs_recovery_wq) 160 goto fail_wq; 161 162 gfs2_control_wq = alloc_workqueue("gfs2_control", 163 WQ_NON_REENTRANT | WQ_UNBOUND | WQ_FREEZABLE, 0); 164 if (!gfs2_control_wq) 165 goto fail_recovery; 166 167 gfs2_bh_pool = mempool_create(1024, gfs2_bh_alloc, gfs2_bh_free, NULL); 168 if (!gfs2_bh_pool) 169 goto fail_control; 170 171 gfs2_register_debugfs(); 172 173 printk("GFS2 installed\n"); 174 175 return 0; 176 177 fail_control: 178 destroy_workqueue(gfs2_control_wq); 179 fail_recovery: 180 destroy_workqueue(gfs_recovery_wq); 181 fail_wq: 182 unregister_filesystem(&gfs2meta_fs_type); 183 fail_unregister: 184 unregister_filesystem(&gfs2_fs_type); 185 fail: 186 unregister_shrinker(&qd_shrinker); 187 gfs2_glock_exit(); 188 189 if (gfs2_quotad_cachep) 190 kmem_cache_destroy(gfs2_quotad_cachep); 191 192 if (gfs2_rgrpd_cachep) 193 kmem_cache_destroy(gfs2_rgrpd_cachep); 194 195 if (gfs2_bufdata_cachep) 196 kmem_cache_destroy(gfs2_bufdata_cachep); 197 198 if (gfs2_inode_cachep) 199 kmem_cache_destroy(gfs2_inode_cachep); 200 201 if (gfs2_glock_aspace_cachep) 202 kmem_cache_destroy(gfs2_glock_aspace_cachep); 203 204 if (gfs2_glock_cachep) 205 kmem_cache_destroy(gfs2_glock_cachep); 206 207 gfs2_sys_uninit(); 208 return error; 209 } 210 211 /** 212 * exit_gfs2_fs - Unregister the file system 213 * 214 */ 215 216 static void __exit exit_gfs2_fs(void) 217 { 218 unregister_shrinker(&qd_shrinker); 219 gfs2_glock_exit(); 220 gfs2_unregister_debugfs(); 221 unregister_filesystem(&gfs2_fs_type); 222 unregister_filesystem(&gfs2meta_fs_type); 223 destroy_workqueue(gfs_recovery_wq); 224 destroy_workqueue(gfs2_control_wq); 225 226 rcu_barrier(); 227 228 mempool_destroy(gfs2_bh_pool); 229 kmem_cache_destroy(gfs2_quotad_cachep); 230 kmem_cache_destroy(gfs2_rgrpd_cachep); 231 kmem_cache_destroy(gfs2_bufdata_cachep); 232 kmem_cache_destroy(gfs2_inode_cachep); 233 kmem_cache_destroy(gfs2_glock_aspace_cachep); 234 kmem_cache_destroy(gfs2_glock_cachep); 235 236 gfs2_sys_uninit(); 237 } 238 239 MODULE_DESCRIPTION("Global File System"); 240 MODULE_AUTHOR("Red Hat, Inc."); 241 MODULE_LICENSE("GPL"); 242 243 module_init(init_gfs2_fs); 244 module_exit(exit_gfs2_fs); 245 246