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 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 ret;
  72         }
  73         return 0;
  74 }
  75
  76 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(void)
  83 {
  84         struct btrfs_fs_info *fs_info = kzalloc(sizeof(struct btrfs_fs_info),
  85                                                 GFP_NOFS);
  86
  87         if (!fs_info)
  88                 return fs_info;
  89         fs_info->fs_devices = kzalloc(sizeof(struct btrfs_fs_devices),
  90                                       GFP_NOFS);
  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_NOFS);
  97         if (!fs_info->super_copy) {
  98                 kfree(fs_info->fs_devices);
  99                 kfree(fs_info);
 100                 return NULL;
 101         }
 102
 103         if (init_srcu_struct(&fs_info->subvol_srcu)) {
 104                 kfree(fs_info->fs_devices);
 105                 kfree(fs_info->super_copy);
 106                 kfree(fs_info);
 107                 return NULL;
 108         }
 109
 110         spin_lock_init(&fs_info->buffer_lock);
 111         spin_lock_init(&fs_info->qgroup_lock);
 112         spin_lock_init(&fs_info->qgroup_op_lock);
 113         spin_lock_init(&fs_info->super_lock);
 114         spin_lock_init(&fs_info->fs_roots_radix_lock);
 115         spin_lock_init(&fs_info->tree_mod_seq_lock);
 116         mutex_init(&fs_info->qgroup_ioctl_lock);
 117         mutex_init(&fs_info->qgroup_rescan_lock);
 118         rwlock_init(&fs_info->tree_mod_log_lock);
 119         fs_info->running_transaction = NULL;
 120         fs_info->qgroup_tree = RB_ROOT;
 121         fs_info->qgroup_ulist = NULL;
 122         atomic64_set(&fs_info->tree_mod_seq, 0);
 123         INIT_LIST_HEAD(&fs_info->dirty_qgroups);
 124         INIT_LIST_HEAD(&fs_info->dead_roots);
 125         INIT_LIST_HEAD(&fs_info->tree_mod_seq_list);
 126         INIT_RADIX_TREE(&fs_info->buffer_radix, GFP_ATOMIC);
 127         INIT_RADIX_TREE(&fs_info->fs_roots_radix, GFP_ATOMIC);
 128         extent_io_tree_init(&fs_info->freed_extents[0], NULL);
 129         extent_io_tree_init(&fs_info->freed_extents[1], NULL);
 130         fs_info->pinned_extents = &fs_info->freed_extents[0];
 131         return fs_info;
 132 }
 133
 134 static void btrfs_free_dummy_fs_info(struct btrfs_fs_info *fs_info)
 135 {
 136         struct radix_tree_iter iter;
 137         void **slot;
 138
 139         spin_lock(&fs_info->buffer_lock);
 140 restart:
 141         radix_tree_for_each_slot(slot, &fs_info->buffer_radix, &iter, 0) {
 142                 struct extent_buffer *eb;
 143
 144                 eb = radix_tree_deref_slot_protected(slot, &fs_info->buffer_lock);
 145                 if (!eb)
 146                         continue;
 147                 /* Shouldn't happen but that kind of thinking creates CVE's */
 148                 if (radix_tree_exception(eb)) {
 149                         if (radix_tree_deref_retry(eb))
 150                                 goto restart;
 151                         continue;
 152                 }
 153                 spin_unlock(&fs_info->buffer_lock);
 154                 free_extent_buffer_stale(eb);
 155                 spin_lock(&fs_info->buffer_lock);
 156         }
 157         spin_unlock(&fs_info->buffer_lock);
 158
 159         btrfs_free_qgroup_config(fs_info);
 160         btrfs_free_fs_roots(fs_info);
 161         cleanup_srcu_struct(&fs_info->subvol_srcu);
 162         kfree(fs_info->super_copy);
 163         kfree(fs_info->fs_devices);
 164         kfree(fs_info);
 165 }
 166
 167 void btrfs_free_dummy_root(struct btrfs_root *root)
 168 {
 169         if (!root)
 170                 return;
 171         if (root->node)
 172                 free_extent_buffer(root->node);
 173         if (root->fs_info)
 174                 btrfs_free_dummy_fs_info(root->fs_info);
 175         kfree(root);
 176 }
 177
 178 struct btrfs_block_group_cache *
 179 btrfs_alloc_dummy_block_group(unsigned long length)
 180 {
 181         struct btrfs_block_group_cache *cache;
 182
 183         cache = kzalloc(sizeof(*cache), GFP_NOFS);
 184         if (!cache)
 185                 return NULL;
 186         cache->free_space_ctl = kzalloc(sizeof(*cache->free_space_ctl),
 187                                         GFP_NOFS);
 188         if (!cache->free_space_ctl) {
 189                 kfree(cache);
 190                 return NULL;
 191         }
 192         cache->fs_info = btrfs_alloc_dummy_fs_info();
 193         if (!cache->fs_info) {
 194                 kfree(cache->free_space_ctl);
 195                 kfree(cache);
 196                 return NULL;
 197         }
 198
 199         cache->key.objectid = 0;
 200         cache->key.offset = length;
 201         cache->key.type = BTRFS_BLOCK_GROUP_ITEM_KEY;
 202         cache->sectorsize = 4096;
 203         cache->full_stripe_len = 4096;
 204
 205         INIT_LIST_HEAD(&cache->list);
 206         INIT_LIST_HEAD(&cache->cluster_list);
 207         INIT_LIST_HEAD(&cache->bg_list);
 208         btrfs_init_free_space_ctl(cache);
 209         mutex_init(&cache->free_space_lock);
 210
 211         return cache;
 212 }
 213
 214 void btrfs_free_dummy_block_group(struct btrfs_block_group_cache *cache)
 215 {
 216         if (!cache)
 217                 return;
 218         __btrfs_remove_free_space_cache(cache->free_space_ctl);
 219         kfree(cache->free_space_ctl);
 220         kfree(cache);
 221 }
 222
 223 void btrfs_init_dummy_trans(struct btrfs_trans_handle *trans)
 224 {
 225         memset(trans, 0, sizeof(*trans));
 226         trans->transid = 1;
 227         INIT_LIST_HEAD(&trans->qgroup_ref_list);
 228         trans->type = __TRANS_DUMMY;
 229 }