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