fs/btrfs/tests/btrfs-tests.c

   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         struct inode *inode;
  55
  56         inode = new_inode(test_mnt->mnt_sb);
  57         if (inode)
  58                 inode_init_owner(inode, NULL, S_IFREG);
  59
  60         return inode;
  61 }
  62
  63 static int btrfs_init_test_fs(void)
  64 {
  65         int ret;
  66
  67         ret = register_filesystem(&test_type);
  68         if (ret) {
  69                 printk(KERN_ERR "btrfs: cannot register test file system\n");
  70                 return ret;
  71         }
  72
  73         test_mnt = kern_mount(&test_type);
  74         if (IS_ERR(test_mnt)) {
  75                 printk(KERN_ERR "btrfs: cannot mount test file system\n");
  76                 unregister_filesystem(&test_type);
  77                 return PTR_ERR(test_mnt);
  78         }
  79         return 0;
  80 }
  81
  82 static void btrfs_destroy_test_fs(void)
  83 {
  84         kern_unmount(test_mnt);
  85         unregister_filesystem(&test_type);
  86 }
  87
  88 struct btrfs_fs_info *btrfs_alloc_dummy_fs_info(u32 nodesize, u32 sectorsize)
  89 {
  90         struct btrfs_fs_info *fs_info = kzalloc(sizeof(struct btrfs_fs_info),
  91                                                 GFP_KERNEL);
  92
  93         if (!fs_info)
  94                 return fs_info;
  95         fs_info->fs_devices = kzalloc(sizeof(struct btrfs_fs_devices),
  96                                       GFP_KERNEL);
  97         if (!fs_info->fs_devices) {
  98                 kfree(fs_info);
  99                 return NULL;
 100         }
 101         fs_info->super_copy = kzalloc(sizeof(struct btrfs_super_block),
 102                                       GFP_KERNEL);
 103         if (!fs_info->super_copy) {
 104                 kfree(fs_info->fs_devices);
 105                 kfree(fs_info);
 106                 return NULL;
 107         }
 108
 109         fs_info->nodesize = nodesize;
 110         fs_info->sectorsize = sectorsize;
 111
 112         if (init_srcu_struct(&fs_info->subvol_srcu)) {
 113                 kfree(fs_info->fs_devices);
 114                 kfree(fs_info->super_copy);
 115                 kfree(fs_info);
 116                 return NULL;
 117         }
 118
 119         spin_lock_init(&fs_info->buffer_lock);
 120         spin_lock_init(&fs_info->qgroup_lock);
 121         spin_lock_init(&fs_info->qgroup_op_lock);
 122         spin_lock_init(&fs_info->super_lock);
 123         spin_lock_init(&fs_info->fs_roots_radix_lock);
 124         mutex_init(&fs_info->qgroup_ioctl_lock);
 125         mutex_init(&fs_info->qgroup_rescan_lock);
 126         rwlock_init(&fs_info->tree_mod_log_lock);
 127         fs_info->running_transaction = NULL;
 128         fs_info->qgroup_tree = RB_ROOT;
 129         fs_info->qgroup_ulist = NULL;
 130         atomic64_set(&fs_info->tree_mod_seq, 0);
 131         INIT_LIST_HEAD(&fs_info->dirty_qgroups);
 132         INIT_LIST_HEAD(&fs_info->dead_roots);
 133         INIT_LIST_HEAD(&fs_info->tree_mod_seq_list);
 134         INIT_RADIX_TREE(&fs_info->buffer_radix, GFP_ATOMIC);
 135         INIT_RADIX_TREE(&fs_info->fs_roots_radix, GFP_ATOMIC);
 136         extent_io_tree_init(&fs_info->freed_extents[0], NULL);
 137         extent_io_tree_init(&fs_info->freed_extents[1], NULL);
 138         fs_info->pinned_extents = &fs_info->freed_extents[0];
 139         set_bit(BTRFS_FS_STATE_DUMMY_FS_INFO, &fs_info->fs_state);
 140
 141         test_mnt->mnt_sb->s_fs_info = fs_info;
 142
 143         return fs_info;
 144 }
 145
 146 void btrfs_free_dummy_fs_info(struct btrfs_fs_info *fs_info)
 147 {
 148         struct radix_tree_iter iter;
 149         void **slot;
 150
 151         if (!fs_info)
 152                 return;
 153
 154         if (WARN_ON(!test_bit(BTRFS_FS_STATE_DUMMY_FS_INFO,
 155                               &fs_info->fs_state)))
 156                 return;
 157
 158         test_mnt->mnt_sb->s_fs_info = NULL;
 159
 160         spin_lock(&fs_info->buffer_lock);
 161         radix_tree_for_each_slot(slot, &fs_info->buffer_radix, &iter, 0) {
 162                 struct extent_buffer *eb;
 163
 164                 eb = radix_tree_deref_slot_protected(slot, &fs_info->buffer_lock);
 165                 if (!eb)
 166                         continue;
 167                 /* Shouldn't happen but that kind of thinking creates CVE's */
 168                 if (radix_tree_exception(eb)) {
 169                         if (radix_tree_deref_retry(eb))
 170                                 slot = radix_tree_iter_retry(&iter);
 171                         continue;
 172                 }
 173                 slot = radix_tree_iter_resume(slot, &iter);
 174                 spin_unlock(&fs_info->buffer_lock);
 175                 free_extent_buffer_stale(eb);
 176                 spin_lock(&fs_info->buffer_lock);
 177         }
 178         spin_unlock(&fs_info->buffer_lock);
 179
 180         btrfs_free_qgroup_config(fs_info);
 181         btrfs_free_fs_roots(fs_info);
 182         cleanup_srcu_struct(&fs_info->subvol_srcu);
 183         kfree(fs_info->super_copy);
 184         kfree(fs_info->fs_devices);
 185         kfree(fs_info);
 186 }
 187
 188 void btrfs_free_dummy_root(struct btrfs_root *root)
 189 {
 190         if (!root)
 191                 return;
 192         /* Will be freed by btrfs_free_fs_roots */
 193         if (WARN_ON(test_bit(BTRFS_ROOT_IN_RADIX, &root->state)))
 194                 return;
 195         if (root->node)
 196                 free_extent_buffer(root->node);
 197         kfree(root);
 198 }
 199
 200 struct btrfs_block_group_cache *
 201 btrfs_alloc_dummy_block_group(struct btrfs_fs_info *fs_info,
 202                               unsigned long length)
 203 {
 204         struct btrfs_block_group_cache *cache;
 205
 206         cache = kzalloc(sizeof(*cache), GFP_KERNEL);
 207         if (!cache)
 208                 return NULL;
 209         cache->free_space_ctl = kzalloc(sizeof(*cache->free_space_ctl),
 210                                         GFP_KERNEL);
 211         if (!cache->free_space_ctl) {
 212                 kfree(cache);
 213                 return NULL;
 214         }
 215
 216         cache->key.objectid = 0;
 217         cache->key.offset = length;
 218         cache->key.type = BTRFS_BLOCK_GROUP_ITEM_KEY;
 219         cache->full_stripe_len = fs_info->sectorsize;
 220         cache->fs_info = fs_info;
 221
 222         INIT_LIST_HEAD(&cache->list);
 223         INIT_LIST_HEAD(&cache->cluster_list);
 224         INIT_LIST_HEAD(&cache->bg_list);
 225         btrfs_init_free_space_ctl(cache);
 226         mutex_init(&cache->free_space_lock);
 227
 228         return cache;
 229 }
 230
 231 void btrfs_free_dummy_block_group(struct btrfs_block_group_cache *cache)
 232 {
 233         if (!cache)
 234                 return;
 235         __btrfs_remove_free_space_cache(cache->free_space_ctl);
 236         kfree(cache->free_space_ctl);
 237         kfree(cache);
 238 }
 239
 240 void btrfs_init_dummy_trans(struct btrfs_trans_handle *trans)
 241 {
 242         memset(trans, 0, sizeof(*trans));
 243         trans->transid = 1;
 244         trans->type = __TRANS_DUMMY;
 245 }
 246
 247 int btrfs_run_sanity_tests(void)
 248 {
 249         int ret, i;
 250         u32 sectorsize, nodesize;
 251         u32 test_sectorsize[] = {
 252                 PAGE_SIZE,
 253         };
 254         ret = btrfs_init_test_fs();
 255         if (ret)
 256                 return ret;
 257         for (i = 0; i < ARRAY_SIZE(test_sectorsize); i++) {
 258                 sectorsize = test_sectorsize[i];
 259                 for (nodesize = sectorsize;
 260                      nodesize <= BTRFS_MAX_METADATA_BLOCKSIZE;
 261                      nodesize <<= 1) {
 262                         pr_info("BTRFS: selftest: sectorsize: %u  nodesize: %u\n",
 263                                 sectorsize, nodesize);
 264                         ret = btrfs_test_free_space_cache(sectorsize, nodesize);
 265                         if (ret)
 266                                 goto out;
 267                         ret = btrfs_test_extent_buffer_operations(sectorsize,
 268                                 nodesize);
 269                         if (ret)
 270                                 goto out;
 271                         ret = btrfs_test_extent_io(sectorsize, nodesize);
 272                         if (ret)
 273                                 goto out;
 274                         ret = btrfs_test_inodes(sectorsize, nodesize);
 275                         if (ret)
 276                                 goto out;
 277                         ret = btrfs_test_qgroups(sectorsize, nodesize);
 278                         if (ret)
 279                                 goto out;
 280                         ret = btrfs_test_free_space_tree(sectorsize, nodesize);
 281                         if (ret)
 282                                 goto out;
 283                 }
 284         }
 285 out:
 286         btrfs_destroy_test_fs();
 287         return ret;
 288 }