fs/btrfs/tests/btrfs-tests.c

   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         fs_info->super_copy = kzalloc(sizeof(struct btrfs_super_block),
 124                                       GFP_KERNEL);
 125         if (!fs_info->super_copy) {
 126                 kfree(fs_info->fs_devices);
 127                 kfree(fs_info);
 128                 return NULL;
 129         }
 130
 131         fs_info->nodesize = nodesize;
 132         fs_info->sectorsize = sectorsize;
 133
 134         if (init_srcu_struct(&fs_info->subvol_srcu)) {
 135                 kfree(fs_info->fs_devices);
 136                 kfree(fs_info->super_copy);
 137                 kfree(fs_info);
 138                 return NULL;
 139         }
 140
 141         spin_lock_init(&fs_info->buffer_lock);
 142         spin_lock_init(&fs_info->qgroup_lock);
 143         spin_lock_init(&fs_info->super_lock);
 144         spin_lock_init(&fs_info->fs_roots_radix_lock);
 145         mutex_init(&fs_info->qgroup_ioctl_lock);
 146         mutex_init(&fs_info->qgroup_rescan_lock);
 147         rwlock_init(&fs_info->tree_mod_log_lock);
 148         fs_info->running_transaction = NULL;
 149         fs_info->qgroup_tree = RB_ROOT;
 150         fs_info->qgroup_ulist = NULL;
 151         atomic64_set(&fs_info->tree_mod_seq, 0);
 152         INIT_LIST_HEAD(&fs_info->dirty_qgroups);
 153         INIT_LIST_HEAD(&fs_info->dead_roots);
 154         INIT_LIST_HEAD(&fs_info->tree_mod_seq_list);
 155         INIT_LIST_HEAD(&fs_info->fs_devices->devices);
 156         INIT_RADIX_TREE(&fs_info->buffer_radix, GFP_ATOMIC);
 157         INIT_RADIX_TREE(&fs_info->fs_roots_radix, GFP_ATOMIC);
 158         extent_io_tree_init(fs_info, &fs_info->freed_extents[0],
 159                             IO_TREE_FS_INFO_FREED_EXTENTS0, NULL);
 160         extent_io_tree_init(fs_info, &fs_info->freed_extents[1],
 161                             IO_TREE_FS_INFO_FREED_EXTENTS1, NULL);
 162         extent_map_tree_init(&fs_info->mapping_tree);
 163         fs_info->pinned_extents = &fs_info->freed_extents[0];
 164         set_bit(BTRFS_FS_STATE_DUMMY_FS_INFO, &fs_info->fs_state);
 165
 166         test_mnt->mnt_sb->s_fs_info = fs_info;
 167
 168         return fs_info;
 169 }
 170
 171 void btrfs_free_dummy_fs_info(struct btrfs_fs_info *fs_info)
 172 {
 173         struct radix_tree_iter iter;
 174         void **slot;
 175         struct btrfs_device *dev, *tmp;
 176
 177         if (!fs_info)
 178                 return;
 179
 180         if (WARN_ON(!test_bit(BTRFS_FS_STATE_DUMMY_FS_INFO,
 181                               &fs_info->fs_state)))
 182                 return;
 183
 184         test_mnt->mnt_sb->s_fs_info = NULL;
 185
 186         spin_lock(&fs_info->buffer_lock);
 187         radix_tree_for_each_slot(slot, &fs_info->buffer_radix, &iter, 0) {
 188                 struct extent_buffer *eb;
 189
 190                 eb = radix_tree_deref_slot_protected(slot, &fs_info->buffer_lock);
 191                 if (!eb)
 192                         continue;
 193                 /* Shouldn't happen but that kind of thinking creates CVE's */
 194                 if (radix_tree_exception(eb)) {
 195                         if (radix_tree_deref_retry(eb))
 196                                 slot = radix_tree_iter_retry(&iter);
 197                         continue;
 198                 }
 199                 slot = radix_tree_iter_resume(slot, &iter);
 200                 spin_unlock(&fs_info->buffer_lock);
 201                 free_extent_buffer_stale(eb);
 202                 spin_lock(&fs_info->buffer_lock);
 203         }
 204         spin_unlock(&fs_info->buffer_lock);
 205
 206         btrfs_mapping_tree_free(&fs_info->mapping_tree);
 207         list_for_each_entry_safe(dev, tmp, &fs_info->fs_devices->devices,
 208                                  dev_list) {
 209                 btrfs_free_dummy_device(dev);
 210         }
 211         btrfs_free_qgroup_config(fs_info);
 212         btrfs_free_fs_roots(fs_info);
 213         cleanup_srcu_struct(&fs_info->subvol_srcu);
 214         kfree(fs_info->super_copy);
 215         kfree(fs_info->fs_devices);
 216         kfree(fs_info);
 217 }
 218
 219 void btrfs_free_dummy_root(struct btrfs_root *root)
 220 {
 221         if (!root)
 222                 return;
 223         /* Will be freed by btrfs_free_fs_roots */
 224         if (WARN_ON(test_bit(BTRFS_ROOT_IN_RADIX, &root->state)))
 225                 return;
 226         if (root->node) {
 227                 /* One for allocate_extent_buffer */
 228                 free_extent_buffer(root->node);
 229         }
 230         kfree(root);
 231 }
 232
 233 struct btrfs_block_group *
 234 btrfs_alloc_dummy_block_group(struct btrfs_fs_info *fs_info,
 235                               unsigned long length)
 236 {
 237         struct btrfs_block_group *cache;
 238
 239         cache = kzalloc(sizeof(*cache), GFP_KERNEL);
 240         if (!cache)
 241                 return NULL;
 242         cache->free_space_ctl = kzalloc(sizeof(*cache->free_space_ctl),
 243                                         GFP_KERNEL);
 244         if (!cache->free_space_ctl) {
 245                 kfree(cache);
 246                 return NULL;
 247         }
 248
 249         cache->start = 0;
 250         cache->length = length;
 251         cache->full_stripe_len = fs_info->sectorsize;
 252         cache->fs_info = fs_info;
 253
 254         INIT_LIST_HEAD(&cache->list);
 255         INIT_LIST_HEAD(&cache->cluster_list);
 256         INIT_LIST_HEAD(&cache->bg_list);
 257         btrfs_init_free_space_ctl(cache);
 258         mutex_init(&cache->free_space_lock);
 259
 260         return cache;
 261 }
 262
 263 void btrfs_free_dummy_block_group(struct btrfs_block_group *cache)
 264 {
 265         if (!cache)
 266                 return;
 267         __btrfs_remove_free_space_cache(cache->free_space_ctl);
 268         kfree(cache->free_space_ctl);
 269         kfree(cache);
 270 }
 271
 272 void btrfs_init_dummy_trans(struct btrfs_trans_handle *trans,
 273                             struct btrfs_fs_info *fs_info)
 274 {
 275         memset(trans, 0, sizeof(*trans));
 276         trans->transid = 1;
 277         trans->type = __TRANS_DUMMY;
 278         trans->fs_info = fs_info;
 279 }
 280
 281 int btrfs_run_sanity_tests(void)
 282 {
 283         int ret, i;
 284         u32 sectorsize, nodesize;
 285         u32 test_sectorsize[] = {
 286                 PAGE_SIZE,
 287         };
 288         ret = btrfs_init_test_fs();
 289         if (ret)
 290                 return ret;
 291         for (i = 0; i < ARRAY_SIZE(test_sectorsize); i++) {
 292                 sectorsize = test_sectorsize[i];
 293                 for (nodesize = sectorsize;
 294                      nodesize <= BTRFS_MAX_METADATA_BLOCKSIZE;
 295                      nodesize <<= 1) {
 296                         pr_info("BTRFS: selftest: sectorsize: %u  nodesize: %u\n",
 297                                 sectorsize, nodesize);
 298                         ret = btrfs_test_free_space_cache(sectorsize, nodesize);
 299                         if (ret)
 300                                 goto out;
 301                         ret = btrfs_test_extent_buffer_operations(sectorsize,
 302                                 nodesize);
 303                         if (ret)
 304                                 goto out;
 305                         ret = btrfs_test_extent_io(sectorsize, nodesize);
 306                         if (ret)
 307                                 goto out;
 308                         ret = btrfs_test_inodes(sectorsize, nodesize);
 309                         if (ret)
 310                                 goto out;
 311                         ret = btrfs_test_qgroups(sectorsize, nodesize);
 312                         if (ret)
 313                                 goto out;
 314                         ret = btrfs_test_free_space_tree(sectorsize, nodesize);
 315                         if (ret)
 316                                 goto out;
 317                 }
 318         }
 319         ret = btrfs_test_extent_map();
 320
 321 out:
 322         btrfs_destroy_test_fs();
 323         return ret;
 324 }