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(void) 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 if (init_srcu_struct(&fs_info->subvol_srcu)) { 104 kfree(fs_info->fs_devices); 105 kfree(fs_info->super_copy); 106 kfree(fs_info); 107 return NULL; 108 } 109 110 spin_lock_init(&fs_info->buffer_lock); 111 spin_lock_init(&fs_info->qgroup_lock); 112 spin_lock_init(&fs_info->qgroup_op_lock); 113 spin_lock_init(&fs_info->super_lock); 114 spin_lock_init(&fs_info->fs_roots_radix_lock); 115 spin_lock_init(&fs_info->tree_mod_seq_lock); 116 mutex_init(&fs_info->qgroup_ioctl_lock); 117 mutex_init(&fs_info->qgroup_rescan_lock); 118 rwlock_init(&fs_info->tree_mod_log_lock); 119 fs_info->running_transaction = NULL; 120 fs_info->qgroup_tree = RB_ROOT; 121 fs_info->qgroup_ulist = NULL; 122 atomic64_set(&fs_info->tree_mod_seq, 0); 123 INIT_LIST_HEAD(&fs_info->dirty_qgroups); 124 INIT_LIST_HEAD(&fs_info->dead_roots); 125 INIT_LIST_HEAD(&fs_info->tree_mod_seq_list); 126 INIT_RADIX_TREE(&fs_info->buffer_radix, GFP_ATOMIC); 127 INIT_RADIX_TREE(&fs_info->fs_roots_radix, GFP_ATOMIC); 128 extent_io_tree_init(&fs_info->freed_extents[0], NULL); 129 extent_io_tree_init(&fs_info->freed_extents[1], NULL); 130 fs_info->pinned_extents = &fs_info->freed_extents[0]; 131 set_bit(BTRFS_FS_STATE_DUMMY_FS_INFO, &fs_info->fs_state); 132 133 test_mnt->mnt_sb->s_fs_info = fs_info; 134 135 return fs_info; 136 } 137 138 void btrfs_free_dummy_fs_info(struct btrfs_fs_info *fs_info) 139 { 140 struct radix_tree_iter iter; 141 void **slot; 142 143 if (!fs_info) 144 return; 145 146 if (WARN_ON(!test_bit(BTRFS_FS_STATE_DUMMY_FS_INFO, 147 &fs_info->fs_state))) 148 return; 149 150 test_mnt->mnt_sb->s_fs_info = NULL; 151 152 spin_lock(&fs_info->buffer_lock); 153 radix_tree_for_each_slot(slot, &fs_info->buffer_radix, &iter, 0) { 154 struct extent_buffer *eb; 155 156 eb = radix_tree_deref_slot_protected(slot, &fs_info->buffer_lock); 157 if (!eb) 158 continue; 159 /* Shouldn't happen but that kind of thinking creates CVE's */ 160 if (radix_tree_exception(eb)) { 161 if (radix_tree_deref_retry(eb)) 162 slot = radix_tree_iter_retry(&iter); 163 continue; 164 } 165 spin_unlock(&fs_info->buffer_lock); 166 free_extent_buffer_stale(eb); 167 spin_lock(&fs_info->buffer_lock); 168 } 169 spin_unlock(&fs_info->buffer_lock); 170 171 btrfs_free_qgroup_config(fs_info); 172 btrfs_free_fs_roots(fs_info); 173 cleanup_srcu_struct(&fs_info->subvol_srcu); 174 kfree(fs_info->super_copy); 175 kfree(fs_info->fs_devices); 176 kfree(fs_info); 177 } 178 179 void btrfs_free_dummy_root(struct btrfs_root *root) 180 { 181 if (!root) 182 return; 183 /* Will be freed by btrfs_free_fs_roots */ 184 if (WARN_ON(test_bit(BTRFS_ROOT_IN_RADIX, &root->state))) 185 return; 186 if (root->node) 187 free_extent_buffer(root->node); 188 kfree(root); 189 } 190 191 struct btrfs_block_group_cache * 192 btrfs_alloc_dummy_block_group(unsigned long length, u32 sectorsize) 193 { 194 struct btrfs_block_group_cache *cache; 195 196 cache = kzalloc(sizeof(*cache), GFP_KERNEL); 197 if (!cache) 198 return NULL; 199 cache->free_space_ctl = kzalloc(sizeof(*cache->free_space_ctl), 200 GFP_KERNEL); 201 if (!cache->free_space_ctl) { 202 kfree(cache); 203 return NULL; 204 } 205 206 cache->key.objectid = 0; 207 cache->key.offset = length; 208 cache->key.type = BTRFS_BLOCK_GROUP_ITEM_KEY; 209 cache->sectorsize = sectorsize; 210 cache->full_stripe_len = sectorsize; 211 212 INIT_LIST_HEAD(&cache->list); 213 INIT_LIST_HEAD(&cache->cluster_list); 214 INIT_LIST_HEAD(&cache->bg_list); 215 btrfs_init_free_space_ctl(cache); 216 mutex_init(&cache->free_space_lock); 217 218 return cache; 219 } 220 221 void btrfs_free_dummy_block_group(struct btrfs_block_group_cache *cache) 222 { 223 if (!cache) 224 return; 225 __btrfs_remove_free_space_cache(cache->free_space_ctl); 226 kfree(cache->free_space_ctl); 227 kfree(cache); 228 } 229 230 void btrfs_init_dummy_trans(struct btrfs_trans_handle *trans) 231 { 232 memset(trans, 0, sizeof(*trans)); 233 trans->transid = 1; 234 INIT_LIST_HEAD(&trans->qgroup_ref_list); 235 trans->type = __TRANS_DUMMY; 236 } 237 238 int btrfs_run_sanity_tests(void) 239 { 240 int ret, i; 241 u32 sectorsize, nodesize; 242 u32 test_sectorsize[] = { 243 PAGE_SIZE, 244 }; 245 ret = btrfs_init_test_fs(); 246 if (ret) 247 return ret; 248 for (i = 0; i < ARRAY_SIZE(test_sectorsize); i++) { 249 sectorsize = test_sectorsize[i]; 250 for (nodesize = sectorsize; 251 nodesize <= BTRFS_MAX_METADATA_BLOCKSIZE; 252 nodesize <<= 1) { 253 pr_info("BTRFS: selftest: sectorsize: %u nodesize: %u\n", 254 sectorsize, nodesize); 255 ret = btrfs_test_free_space_cache(sectorsize, nodesize); 256 if (ret) 257 goto out; 258 ret = btrfs_test_extent_buffer_operations(sectorsize, 259 nodesize); 260 if (ret) 261 goto out; 262 ret = btrfs_test_extent_io(sectorsize, nodesize); 263 if (ret) 264 goto out; 265 ret = btrfs_test_inodes(sectorsize, nodesize); 266 if (ret) 267 goto out; 268 ret = btrfs_test_qgroups(sectorsize, nodesize); 269 if (ret) 270 goto out; 271 ret = btrfs_test_free_space_tree(sectorsize, nodesize); 272 if (ret) 273 goto out; 274 } 275 } 276 out: 277 btrfs_destroy_test_fs(); 278 return ret; 279 } 280