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 PTR_ERR(test_mnt); 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_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 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 radix_tree_for_each_slot(slot, &fs_info->buffer_radix, &iter, 0) { 141 struct extent_buffer *eb; 142 143 eb = radix_tree_deref_slot_protected(slot, &fs_info->buffer_lock); 144 if (!eb) 145 continue; 146 /* Shouldn't happen but that kind of thinking creates CVE's */ 147 if (radix_tree_exception(eb)) { 148 if (radix_tree_deref_retry(eb)) 149 slot = radix_tree_iter_retry(&iter); 150 continue; 151 } 152 spin_unlock(&fs_info->buffer_lock); 153 free_extent_buffer_stale(eb); 154 spin_lock(&fs_info->buffer_lock); 155 } 156 spin_unlock(&fs_info->buffer_lock); 157 158 btrfs_free_qgroup_config(fs_info); 159 btrfs_free_fs_roots(fs_info); 160 cleanup_srcu_struct(&fs_info->subvol_srcu); 161 kfree(fs_info->super_copy); 162 kfree(fs_info->fs_devices); 163 kfree(fs_info); 164 } 165 166 void btrfs_free_dummy_root(struct btrfs_root *root) 167 { 168 if (!root) 169 return; 170 if (root->node) 171 free_extent_buffer(root->node); 172 if (root->fs_info) 173 btrfs_free_dummy_fs_info(root->fs_info); 174 kfree(root); 175 } 176 177 struct btrfs_block_group_cache * 178 btrfs_alloc_dummy_block_group(unsigned long length, u32 sectorsize) 179 { 180 struct btrfs_block_group_cache *cache; 181 182 cache = kzalloc(sizeof(*cache), GFP_KERNEL); 183 if (!cache) 184 return NULL; 185 cache->free_space_ctl = kzalloc(sizeof(*cache->free_space_ctl), 186 GFP_KERNEL); 187 if (!cache->free_space_ctl) { 188 kfree(cache); 189 return NULL; 190 } 191 192 cache->key.objectid = 0; 193 cache->key.offset = length; 194 cache->key.type = BTRFS_BLOCK_GROUP_ITEM_KEY; 195 cache->sectorsize = sectorsize; 196 cache->full_stripe_len = sectorsize; 197 198 INIT_LIST_HEAD(&cache->list); 199 INIT_LIST_HEAD(&cache->cluster_list); 200 INIT_LIST_HEAD(&cache->bg_list); 201 btrfs_init_free_space_ctl(cache); 202 mutex_init(&cache->free_space_lock); 203 204 return cache; 205 } 206 207 void btrfs_free_dummy_block_group(struct btrfs_block_group_cache *cache) 208 { 209 if (!cache) 210 return; 211 __btrfs_remove_free_space_cache(cache->free_space_ctl); 212 kfree(cache->free_space_ctl); 213 kfree(cache); 214 } 215 216 void btrfs_init_dummy_trans(struct btrfs_trans_handle *trans) 217 { 218 memset(trans, 0, sizeof(*trans)); 219 trans->transid = 1; 220 INIT_LIST_HEAD(&trans->qgroup_ref_list); 221 trans->type = __TRANS_DUMMY; 222 } 223