1 /* 2 * Copyright (C) 2013 Fusion IO. All rights reserved. 3 * 4 * This program is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU General Public 6 * License v2 as published by the Free Software Foundation. 7 * 8 * This program is distributed in the hope that it will be useful, 9 * but WITHOUT ANY WARRANTY; without even the implied warranty of 10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 11 * General Public License for more details. 12 * 13 * You should have received a copy of the GNU General Public 14 * License along with this program; if not, write to the 15 * Free Software Foundation, Inc., 59 Temple Place - Suite 330, 16 * Boston, MA 021110-1307, USA. 17 */ 18 19 #include <linux/fs.h> 20 #include <linux/mount.h> 21 #include <linux/magic.h> 22 #include "btrfs-tests.h" 23 #include "../ctree.h" 24 #include "../free-space-cache.h" 25 #include "../free-space-tree.h" 26 #include "../transaction.h" 27 #include "../volumes.h" 28 #include "../disk-io.h" 29 #include "../qgroup.h" 30 31 static struct vfsmount *test_mnt = NULL; 32 33 static const struct super_operations btrfs_test_super_ops = { 34 .alloc_inode = btrfs_alloc_inode, 35 .destroy_inode = btrfs_test_destroy_inode, 36 }; 37 38 static struct dentry *btrfs_test_mount(struct file_system_type *fs_type, 39 int flags, const char *dev_name, 40 void *data) 41 { 42 return mount_pseudo(fs_type, "btrfs_test:", &btrfs_test_super_ops, 43 NULL, BTRFS_TEST_MAGIC); 44 } 45 46 static struct file_system_type test_type = { 47 .name = "btrfs_test_fs", 48 .mount = btrfs_test_mount, 49 .kill_sb = kill_anon_super, 50 }; 51 52 struct inode *btrfs_new_test_inode(void) 53 { 54 return new_inode(test_mnt->mnt_sb); 55 } 56 57 static int btrfs_init_test_fs(void) 58 { 59 int ret; 60 61 ret = register_filesystem(&test_type); 62 if (ret) { 63 printk(KERN_ERR "btrfs: cannot register test file system\n"); 64 return ret; 65 } 66 67 test_mnt = kern_mount(&test_type); 68 if (IS_ERR(test_mnt)) { 69 printk(KERN_ERR "btrfs: cannot mount test file system\n"); 70 unregister_filesystem(&test_type); 71 return PTR_ERR(test_mnt); 72 } 73 return 0; 74 } 75 76 static void btrfs_destroy_test_fs(void) 77 { 78 kern_unmount(test_mnt); 79 unregister_filesystem(&test_type); 80 } 81 82 struct btrfs_fs_info *btrfs_alloc_dummy_fs_info(u32 nodesize, u32 sectorsize) 83 { 84 struct btrfs_fs_info *fs_info = kzalloc(sizeof(struct btrfs_fs_info), 85 GFP_KERNEL); 86 87 if (!fs_info) 88 return fs_info; 89 fs_info->fs_devices = kzalloc(sizeof(struct btrfs_fs_devices), 90 GFP_KERNEL); 91 if (!fs_info->fs_devices) { 92 kfree(fs_info); 93 return NULL; 94 } 95 fs_info->super_copy = kzalloc(sizeof(struct btrfs_super_block), 96 GFP_KERNEL); 97 if (!fs_info->super_copy) { 98 kfree(fs_info->fs_devices); 99 kfree(fs_info); 100 return NULL; 101 } 102 103 fs_info->nodesize = nodesize; 104 fs_info->sectorsize = sectorsize; 105 106 if (init_srcu_struct(&fs_info->subvol_srcu)) { 107 kfree(fs_info->fs_devices); 108 kfree(fs_info->super_copy); 109 kfree(fs_info); 110 return NULL; 111 } 112 113 spin_lock_init(&fs_info->buffer_lock); 114 spin_lock_init(&fs_info->qgroup_lock); 115 spin_lock_init(&fs_info->qgroup_op_lock); 116 spin_lock_init(&fs_info->super_lock); 117 spin_lock_init(&fs_info->fs_roots_radix_lock); 118 spin_lock_init(&fs_info->tree_mod_seq_lock); 119 mutex_init(&fs_info->qgroup_ioctl_lock); 120 mutex_init(&fs_info->qgroup_rescan_lock); 121 rwlock_init(&fs_info->tree_mod_log_lock); 122 fs_info->running_transaction = NULL; 123 fs_info->qgroup_tree = RB_ROOT; 124 fs_info->qgroup_ulist = NULL; 125 atomic64_set(&fs_info->tree_mod_seq, 0); 126 INIT_LIST_HEAD(&fs_info->dirty_qgroups); 127 INIT_LIST_HEAD(&fs_info->dead_roots); 128 INIT_LIST_HEAD(&fs_info->tree_mod_seq_list); 129 INIT_RADIX_TREE(&fs_info->buffer_radix, GFP_ATOMIC); 130 INIT_RADIX_TREE(&fs_info->fs_roots_radix, GFP_ATOMIC); 131 extent_io_tree_init(&fs_info->freed_extents[0], NULL); 132 extent_io_tree_init(&fs_info->freed_extents[1], NULL); 133 fs_info->pinned_extents = &fs_info->freed_extents[0]; 134 set_bit(BTRFS_FS_STATE_DUMMY_FS_INFO, &fs_info->fs_state); 135 136 test_mnt->mnt_sb->s_fs_info = fs_info; 137 138 return fs_info; 139 } 140 141 void btrfs_free_dummy_fs_info(struct btrfs_fs_info *fs_info) 142 { 143 struct radix_tree_iter iter; 144 void **slot; 145 146 if (!fs_info) 147 return; 148 149 if (WARN_ON(!test_bit(BTRFS_FS_STATE_DUMMY_FS_INFO, 150 &fs_info->fs_state))) 151 return; 152 153 test_mnt->mnt_sb->s_fs_info = NULL; 154 155 spin_lock(&fs_info->buffer_lock); 156 radix_tree_for_each_slot(slot, &fs_info->buffer_radix, &iter, 0) { 157 struct extent_buffer *eb; 158 159 eb = radix_tree_deref_slot_protected(slot, &fs_info->buffer_lock); 160 if (!eb) 161 continue; 162 /* Shouldn't happen but that kind of thinking creates CVE's */ 163 if (radix_tree_exception(eb)) { 164 if (radix_tree_deref_retry(eb)) 165 slot = radix_tree_iter_retry(&iter); 166 continue; 167 } 168 slot = radix_tree_iter_resume(slot, &iter); 169 spin_unlock(&fs_info->buffer_lock); 170 free_extent_buffer_stale(eb); 171 spin_lock(&fs_info->buffer_lock); 172 } 173 spin_unlock(&fs_info->buffer_lock); 174 175 btrfs_free_qgroup_config(fs_info); 176 btrfs_free_fs_roots(fs_info); 177 cleanup_srcu_struct(&fs_info->subvol_srcu); 178 kfree(fs_info->super_copy); 179 kfree(fs_info->fs_devices); 180 kfree(fs_info); 181 } 182 183 void btrfs_free_dummy_root(struct btrfs_root *root) 184 { 185 if (!root) 186 return; 187 /* Will be freed by btrfs_free_fs_roots */ 188 if (WARN_ON(test_bit(BTRFS_ROOT_IN_RADIX, &root->state))) 189 return; 190 if (root->node) 191 free_extent_buffer(root->node); 192 kfree(root); 193 } 194 195 struct btrfs_block_group_cache * 196 btrfs_alloc_dummy_block_group(struct btrfs_fs_info *fs_info, 197 unsigned long length) 198 { 199 struct btrfs_block_group_cache *cache; 200 201 cache = kzalloc(sizeof(*cache), GFP_KERNEL); 202 if (!cache) 203 return NULL; 204 cache->free_space_ctl = kzalloc(sizeof(*cache->free_space_ctl), 205 GFP_KERNEL); 206 if (!cache->free_space_ctl) { 207 kfree(cache); 208 return NULL; 209 } 210 211 cache->key.objectid = 0; 212 cache->key.offset = length; 213 cache->key.type = BTRFS_BLOCK_GROUP_ITEM_KEY; 214 cache->sectorsize = fs_info->sectorsize; 215 cache->full_stripe_len = fs_info->sectorsize; 216 cache->fs_info = fs_info; 217 218 INIT_LIST_HEAD(&cache->list); 219 INIT_LIST_HEAD(&cache->cluster_list); 220 INIT_LIST_HEAD(&cache->bg_list); 221 btrfs_init_free_space_ctl(cache); 222 mutex_init(&cache->free_space_lock); 223 224 return cache; 225 } 226 227 void btrfs_free_dummy_block_group(struct btrfs_block_group_cache *cache) 228 { 229 if (!cache) 230 return; 231 __btrfs_remove_free_space_cache(cache->free_space_ctl); 232 kfree(cache->free_space_ctl); 233 kfree(cache); 234 } 235 236 void btrfs_init_dummy_trans(struct btrfs_trans_handle *trans) 237 { 238 memset(trans, 0, sizeof(*trans)); 239 trans->transid = 1; 240 trans->type = __TRANS_DUMMY; 241 } 242 243 int btrfs_run_sanity_tests(void) 244 { 245 int ret, i; 246 u32 sectorsize, nodesize; 247 u32 test_sectorsize[] = { 248 PAGE_SIZE, 249 }; 250 ret = btrfs_init_test_fs(); 251 if (ret) 252 return ret; 253 for (i = 0; i < ARRAY_SIZE(test_sectorsize); i++) { 254 sectorsize = test_sectorsize[i]; 255 for (nodesize = sectorsize; 256 nodesize <= BTRFS_MAX_METADATA_BLOCKSIZE; 257 nodesize <<= 1) { 258 pr_info("BTRFS: selftest: sectorsize: %u nodesize: %u\n", 259 sectorsize, nodesize); 260 ret = btrfs_test_free_space_cache(sectorsize, nodesize); 261 if (ret) 262 goto out; 263 ret = btrfs_test_extent_buffer_operations(sectorsize, 264 nodesize); 265 if (ret) 266 goto out; 267 ret = btrfs_test_extent_io(sectorsize, nodesize); 268 if (ret) 269 goto out; 270 ret = btrfs_test_inodes(sectorsize, nodesize); 271 if (ret) 272 goto out; 273 ret = btrfs_test_qgroups(sectorsize, nodesize); 274 if (ret) 275 goto out; 276 ret = btrfs_test_free_space_tree(sectorsize, nodesize); 277 if (ret) 278 goto out; 279 } 280 } 281 out: 282 btrfs_destroy_test_fs(); 283 return ret; 284 } 285