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