1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (C) 2013 Fusion IO. All rights reserved. 4 */ 5 6 #include <linux/fs.h> 7 #include <linux/mount.h> 8 #include <linux/pseudo_fs.h> 9 #include <linux/magic.h> 10 #include "btrfs-tests.h" 11 #include "../ctree.h" 12 #include "../free-space-cache.h" 13 #include "../free-space-tree.h" 14 #include "../transaction.h" 15 #include "../volumes.h" 16 #include "../disk-io.h" 17 #include "../qgroup.h" 18 #include "../block-group.h" 19 20 static struct vfsmount *test_mnt = NULL; 21 22 const char *test_error[] = { 23 [TEST_ALLOC_FS_INFO] = "cannot allocate fs_info", 24 [TEST_ALLOC_ROOT] = "cannot allocate root", 25 [TEST_ALLOC_EXTENT_BUFFER] = "cannot extent buffer", 26 [TEST_ALLOC_PATH] = "cannot allocate path", 27 [TEST_ALLOC_INODE] = "cannot allocate inode", 28 [TEST_ALLOC_BLOCK_GROUP] = "cannot allocate block group", 29 [TEST_ALLOC_EXTENT_MAP] = "cannot allocate extent map", 30 }; 31 32 static const struct super_operations btrfs_test_super_ops = { 33 .alloc_inode = btrfs_alloc_inode, 34 .destroy_inode = btrfs_test_destroy_inode, 35 }; 36 37 38 static int btrfs_test_init_fs_context(struct fs_context *fc) 39 { 40 struct pseudo_fs_context *ctx = init_pseudo(fc, BTRFS_TEST_MAGIC); 41 if (!ctx) 42 return -ENOMEM; 43 ctx->ops = &btrfs_test_super_ops; 44 return 0; 45 } 46 47 static struct file_system_type test_type = { 48 .name = "btrfs_test_fs", 49 .init_fs_context = btrfs_test_init_fs_context, 50 .kill_sb = kill_anon_super, 51 }; 52 53 struct inode *btrfs_new_test_inode(void) 54 { 55 struct inode *inode; 56 57 inode = new_inode(test_mnt->mnt_sb); 58 if (inode) 59 inode_init_owner(inode, NULL, S_IFREG); 60 61 return inode; 62 } 63 64 static int btrfs_init_test_fs(void) 65 { 66 int ret; 67 68 ret = register_filesystem(&test_type); 69 if (ret) { 70 printk(KERN_ERR "btrfs: cannot register test file system\n"); 71 return ret; 72 } 73 74 test_mnt = kern_mount(&test_type); 75 if (IS_ERR(test_mnt)) { 76 printk(KERN_ERR "btrfs: cannot mount test file system\n"); 77 unregister_filesystem(&test_type); 78 return PTR_ERR(test_mnt); 79 } 80 return 0; 81 } 82 83 static void btrfs_destroy_test_fs(void) 84 { 85 kern_unmount(test_mnt); 86 unregister_filesystem(&test_type); 87 } 88 89 struct btrfs_device *btrfs_alloc_dummy_device(struct btrfs_fs_info *fs_info) 90 { 91 struct btrfs_device *dev; 92 93 dev = kzalloc(sizeof(*dev), GFP_KERNEL); 94 if (!dev) 95 return ERR_PTR(-ENOMEM); 96 97 extent_io_tree_init(NULL, &dev->alloc_state, 0, NULL); 98 INIT_LIST_HEAD(&dev->dev_list); 99 list_add(&dev->dev_list, &fs_info->fs_devices->devices); 100 101 return dev; 102 } 103 104 static void btrfs_free_dummy_device(struct btrfs_device *dev) 105 { 106 extent_io_tree_release(&dev->alloc_state); 107 kfree(dev); 108 } 109 110 struct btrfs_fs_info *btrfs_alloc_dummy_fs_info(u32 nodesize, u32 sectorsize) 111 { 112 struct btrfs_fs_info *fs_info = kzalloc(sizeof(struct btrfs_fs_info), 113 GFP_KERNEL); 114 115 if (!fs_info) 116 return fs_info; 117 fs_info->fs_devices = kzalloc(sizeof(struct btrfs_fs_devices), 118 GFP_KERNEL); 119 if (!fs_info->fs_devices) { 120 kfree(fs_info); 121 return NULL; 122 } 123 INIT_LIST_HEAD(&fs_info->fs_devices->devices); 124 125 fs_info->super_copy = kzalloc(sizeof(struct btrfs_super_block), 126 GFP_KERNEL); 127 if (!fs_info->super_copy) { 128 kfree(fs_info->fs_devices); 129 kfree(fs_info); 130 return NULL; 131 } 132 133 btrfs_init_fs_info(fs_info); 134 135 fs_info->nodesize = nodesize; 136 fs_info->sectorsize = sectorsize; 137 138 if (init_srcu_struct(&fs_info->subvol_srcu)) { 139 kfree(fs_info->fs_devices); 140 kfree(fs_info->super_copy); 141 kfree(fs_info); 142 return NULL; 143 } 144 145 set_bit(BTRFS_FS_STATE_DUMMY_FS_INFO, &fs_info->fs_state); 146 147 test_mnt->mnt_sb->s_fs_info = fs_info; 148 149 return fs_info; 150 } 151 152 void btrfs_free_dummy_fs_info(struct btrfs_fs_info *fs_info) 153 { 154 struct radix_tree_iter iter; 155 void **slot; 156 struct btrfs_device *dev, *tmp; 157 158 if (!fs_info) 159 return; 160 161 if (WARN_ON(!test_bit(BTRFS_FS_STATE_DUMMY_FS_INFO, 162 &fs_info->fs_state))) 163 return; 164 165 test_mnt->mnt_sb->s_fs_info = NULL; 166 167 spin_lock(&fs_info->buffer_lock); 168 radix_tree_for_each_slot(slot, &fs_info->buffer_radix, &iter, 0) { 169 struct extent_buffer *eb; 170 171 eb = radix_tree_deref_slot_protected(slot, &fs_info->buffer_lock); 172 if (!eb) 173 continue; 174 /* Shouldn't happen but that kind of thinking creates CVE's */ 175 if (radix_tree_exception(eb)) { 176 if (radix_tree_deref_retry(eb)) 177 slot = radix_tree_iter_retry(&iter); 178 continue; 179 } 180 slot = radix_tree_iter_resume(slot, &iter); 181 spin_unlock(&fs_info->buffer_lock); 182 free_extent_buffer_stale(eb); 183 spin_lock(&fs_info->buffer_lock); 184 } 185 spin_unlock(&fs_info->buffer_lock); 186 187 btrfs_mapping_tree_free(&fs_info->mapping_tree); 188 list_for_each_entry_safe(dev, tmp, &fs_info->fs_devices->devices, 189 dev_list) { 190 btrfs_free_dummy_device(dev); 191 } 192 btrfs_free_qgroup_config(fs_info); 193 btrfs_free_fs_roots(fs_info); 194 cleanup_srcu_struct(&fs_info->subvol_srcu); 195 kfree(fs_info->super_copy); 196 kfree(fs_info->fs_devices); 197 kfree(fs_info); 198 } 199 200 void btrfs_free_dummy_root(struct btrfs_root *root) 201 { 202 if (!root) 203 return; 204 /* Will be freed by btrfs_free_fs_roots */ 205 if (WARN_ON(test_bit(BTRFS_ROOT_IN_RADIX, &root->state))) 206 return; 207 if (root->node) { 208 /* One for allocate_extent_buffer */ 209 free_extent_buffer(root->node); 210 } 211 btrfs_put_fs_root(root); 212 } 213 214 struct btrfs_block_group * 215 btrfs_alloc_dummy_block_group(struct btrfs_fs_info *fs_info, 216 unsigned long length) 217 { 218 struct btrfs_block_group *cache; 219 220 cache = kzalloc(sizeof(*cache), GFP_KERNEL); 221 if (!cache) 222 return NULL; 223 cache->free_space_ctl = kzalloc(sizeof(*cache->free_space_ctl), 224 GFP_KERNEL); 225 if (!cache->free_space_ctl) { 226 kfree(cache); 227 return NULL; 228 } 229 230 cache->start = 0; 231 cache->length = length; 232 cache->full_stripe_len = fs_info->sectorsize; 233 cache->fs_info = fs_info; 234 235 INIT_LIST_HEAD(&cache->list); 236 INIT_LIST_HEAD(&cache->cluster_list); 237 INIT_LIST_HEAD(&cache->bg_list); 238 btrfs_init_free_space_ctl(cache); 239 mutex_init(&cache->free_space_lock); 240 241 return cache; 242 } 243 244 void btrfs_free_dummy_block_group(struct btrfs_block_group *cache) 245 { 246 if (!cache) 247 return; 248 __btrfs_remove_free_space_cache(cache->free_space_ctl); 249 kfree(cache->free_space_ctl); 250 kfree(cache); 251 } 252 253 void btrfs_init_dummy_trans(struct btrfs_trans_handle *trans, 254 struct btrfs_fs_info *fs_info) 255 { 256 memset(trans, 0, sizeof(*trans)); 257 trans->transid = 1; 258 trans->type = __TRANS_DUMMY; 259 trans->fs_info = fs_info; 260 } 261 262 int btrfs_run_sanity_tests(void) 263 { 264 int ret, i; 265 u32 sectorsize, nodesize; 266 u32 test_sectorsize[] = { 267 PAGE_SIZE, 268 }; 269 ret = btrfs_init_test_fs(); 270 if (ret) 271 return ret; 272 for (i = 0; i < ARRAY_SIZE(test_sectorsize); i++) { 273 sectorsize = test_sectorsize[i]; 274 for (nodesize = sectorsize; 275 nodesize <= BTRFS_MAX_METADATA_BLOCKSIZE; 276 nodesize <<= 1) { 277 pr_info("BTRFS: selftest: sectorsize: %u nodesize: %u\n", 278 sectorsize, nodesize); 279 ret = btrfs_test_free_space_cache(sectorsize, nodesize); 280 if (ret) 281 goto out; 282 ret = btrfs_test_extent_buffer_operations(sectorsize, 283 nodesize); 284 if (ret) 285 goto out; 286 ret = btrfs_test_extent_io(sectorsize, nodesize); 287 if (ret) 288 goto out; 289 ret = btrfs_test_inodes(sectorsize, nodesize); 290 if (ret) 291 goto out; 292 ret = btrfs_test_qgroups(sectorsize, nodesize); 293 if (ret) 294 goto out; 295 ret = btrfs_test_free_space_tree(sectorsize, nodesize); 296 if (ret) 297 goto out; 298 } 299 } 300 ret = btrfs_test_extent_map(); 301 302 out: 303 btrfs_destroy_test_fs(); 304 return ret; 305 } 306