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