btrfs: Adjust loop in free_extent_buffer
[sfrench/cifs-2.6.git] / fs / btrfs / tests / btrfs-tests.c
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * Copyright (C) 2013 Fusion IO.  All rights reserved.
4  */
5
6 #include <linux/fs.h>
7 #include <linux/mount.h>
8 #include <linux/magic.h>
9 #include "btrfs-tests.h"
10 #include "../ctree.h"
11 #include "../free-space-cache.h"
12 #include "../free-space-tree.h"
13 #include "../transaction.h"
14 #include "../volumes.h"
15 #include "../disk-io.h"
16 #include "../qgroup.h"
17
18 static struct vfsmount *test_mnt = NULL;
19
20 static const struct super_operations btrfs_test_super_ops = {
21         .alloc_inode    = btrfs_alloc_inode,
22         .destroy_inode  = btrfs_test_destroy_inode,
23 };
24
25 static struct dentry *btrfs_test_mount(struct file_system_type *fs_type,
26                                        int flags, const char *dev_name,
27                                        void *data)
28 {
29         return mount_pseudo(fs_type, "btrfs_test:", &btrfs_test_super_ops,
30                             NULL, BTRFS_TEST_MAGIC);
31 }
32
33 static struct file_system_type test_type = {
34         .name           = "btrfs_test_fs",
35         .mount          = btrfs_test_mount,
36         .kill_sb        = kill_anon_super,
37 };
38
39 struct inode *btrfs_new_test_inode(void)
40 {
41         return new_inode(test_mnt->mnt_sb);
42 }
43
44 static int btrfs_init_test_fs(void)
45 {
46         int ret;
47
48         ret = register_filesystem(&test_type);
49         if (ret) {
50                 printk(KERN_ERR "btrfs: cannot register test file system\n");
51                 return ret;
52         }
53
54         test_mnt = kern_mount(&test_type);
55         if (IS_ERR(test_mnt)) {
56                 printk(KERN_ERR "btrfs: cannot mount test file system\n");
57                 unregister_filesystem(&test_type);
58                 return PTR_ERR(test_mnt);
59         }
60         return 0;
61 }
62
63 static void btrfs_destroy_test_fs(void)
64 {
65         kern_unmount(test_mnt);
66         unregister_filesystem(&test_type);
67 }
68
69 struct btrfs_fs_info *btrfs_alloc_dummy_fs_info(u32 nodesize, u32 sectorsize)
70 {
71         struct btrfs_fs_info *fs_info = kzalloc(sizeof(struct btrfs_fs_info),
72                                                 GFP_KERNEL);
73
74         if (!fs_info)
75                 return fs_info;
76         fs_info->fs_devices = kzalloc(sizeof(struct btrfs_fs_devices),
77                                       GFP_KERNEL);
78         if (!fs_info->fs_devices) {
79                 kfree(fs_info);
80                 return NULL;
81         }
82         fs_info->super_copy = kzalloc(sizeof(struct btrfs_super_block),
83                                       GFP_KERNEL);
84         if (!fs_info->super_copy) {
85                 kfree(fs_info->fs_devices);
86                 kfree(fs_info);
87                 return NULL;
88         }
89
90         fs_info->nodesize = nodesize;
91         fs_info->sectorsize = sectorsize;
92
93         if (init_srcu_struct(&fs_info->subvol_srcu)) {
94                 kfree(fs_info->fs_devices);
95                 kfree(fs_info->super_copy);
96                 kfree(fs_info);
97                 return NULL;
98         }
99
100         spin_lock_init(&fs_info->buffer_lock);
101         spin_lock_init(&fs_info->qgroup_lock);
102         spin_lock_init(&fs_info->qgroup_op_lock);
103         spin_lock_init(&fs_info->super_lock);
104         spin_lock_init(&fs_info->fs_roots_radix_lock);
105         spin_lock_init(&fs_info->tree_mod_seq_lock);
106         mutex_init(&fs_info->qgroup_ioctl_lock);
107         mutex_init(&fs_info->qgroup_rescan_lock);
108         rwlock_init(&fs_info->tree_mod_log_lock);
109         fs_info->running_transaction = NULL;
110         fs_info->qgroup_tree = RB_ROOT;
111         fs_info->qgroup_ulist = NULL;
112         atomic64_set(&fs_info->tree_mod_seq, 0);
113         INIT_LIST_HEAD(&fs_info->dirty_qgroups);
114         INIT_LIST_HEAD(&fs_info->dead_roots);
115         INIT_LIST_HEAD(&fs_info->tree_mod_seq_list);
116         INIT_RADIX_TREE(&fs_info->buffer_radix, GFP_ATOMIC);
117         INIT_RADIX_TREE(&fs_info->fs_roots_radix, GFP_ATOMIC);
118         extent_io_tree_init(&fs_info->freed_extents[0], NULL);
119         extent_io_tree_init(&fs_info->freed_extents[1], NULL);
120         fs_info->pinned_extents = &fs_info->freed_extents[0];
121         set_bit(BTRFS_FS_STATE_DUMMY_FS_INFO, &fs_info->fs_state);
122
123         test_mnt->mnt_sb->s_fs_info = fs_info;
124
125         return fs_info;
126 }
127
128 void btrfs_free_dummy_fs_info(struct btrfs_fs_info *fs_info)
129 {
130         struct radix_tree_iter iter;
131         void **slot;
132
133         if (!fs_info)
134                 return;
135
136         if (WARN_ON(!test_bit(BTRFS_FS_STATE_DUMMY_FS_INFO,
137                               &fs_info->fs_state)))
138                 return;
139
140         test_mnt->mnt_sb->s_fs_info = NULL;
141
142         spin_lock(&fs_info->buffer_lock);
143         radix_tree_for_each_slot(slot, &fs_info->buffer_radix, &iter, 0) {
144                 struct extent_buffer *eb;
145
146                 eb = radix_tree_deref_slot_protected(slot, &fs_info->buffer_lock);
147                 if (!eb)
148                         continue;
149                 /* Shouldn't happen but that kind of thinking creates CVE's */
150                 if (radix_tree_exception(eb)) {
151                         if (radix_tree_deref_retry(eb))
152                                 slot = radix_tree_iter_retry(&iter);
153                         continue;
154                 }
155                 slot = radix_tree_iter_resume(slot, &iter);
156                 spin_unlock(&fs_info->buffer_lock);
157                 free_extent_buffer_stale(eb);
158                 spin_lock(&fs_info->buffer_lock);
159         }
160         spin_unlock(&fs_info->buffer_lock);
161
162         btrfs_free_qgroup_config(fs_info);
163         btrfs_free_fs_roots(fs_info);
164         cleanup_srcu_struct(&fs_info->subvol_srcu);
165         kfree(fs_info->super_copy);
166         kfree(fs_info->fs_devices);
167         kfree(fs_info);
168 }
169
170 void btrfs_free_dummy_root(struct btrfs_root *root)
171 {
172         if (!root)
173                 return;
174         /* Will be freed by btrfs_free_fs_roots */
175         if (WARN_ON(test_bit(BTRFS_ROOT_IN_RADIX, &root->state)))
176                 return;
177         if (root->node) {
178                 /* One for allocate_extent_buffer */
179                 free_extent_buffer(root->node);
180         }
181         kfree(root);
182 }
183
184 struct btrfs_block_group_cache *
185 btrfs_alloc_dummy_block_group(struct btrfs_fs_info *fs_info,
186                               unsigned long length)
187 {
188         struct btrfs_block_group_cache *cache;
189
190         cache = kzalloc(sizeof(*cache), GFP_KERNEL);
191         if (!cache)
192                 return NULL;
193         cache->free_space_ctl = kzalloc(sizeof(*cache->free_space_ctl),
194                                         GFP_KERNEL);
195         if (!cache->free_space_ctl) {
196                 kfree(cache);
197                 return NULL;
198         }
199
200         cache->key.objectid = 0;
201         cache->key.offset = length;
202         cache->key.type = BTRFS_BLOCK_GROUP_ITEM_KEY;
203         cache->full_stripe_len = fs_info->sectorsize;
204         cache->fs_info = fs_info;
205
206         INIT_LIST_HEAD(&cache->list);
207         INIT_LIST_HEAD(&cache->cluster_list);
208         INIT_LIST_HEAD(&cache->bg_list);
209         btrfs_init_free_space_ctl(cache);
210         mutex_init(&cache->free_space_lock);
211
212         return cache;
213 }
214
215 void btrfs_free_dummy_block_group(struct btrfs_block_group_cache *cache)
216 {
217         if (!cache)
218                 return;
219         __btrfs_remove_free_space_cache(cache->free_space_ctl);
220         kfree(cache->free_space_ctl);
221         kfree(cache);
222 }
223
224 void btrfs_init_dummy_trans(struct btrfs_trans_handle *trans,
225                             struct btrfs_fs_info *fs_info)
226 {
227         memset(trans, 0, sizeof(*trans));
228         trans->transid = 1;
229         trans->type = __TRANS_DUMMY;
230         trans->fs_info = fs_info;
231 }
232
233 int btrfs_run_sanity_tests(void)
234 {
235         int ret, i;
236         u32 sectorsize, nodesize;
237         u32 test_sectorsize[] = {
238                 PAGE_SIZE,
239         };
240         ret = btrfs_init_test_fs();
241         if (ret)
242                 return ret;
243         for (i = 0; i < ARRAY_SIZE(test_sectorsize); i++) {
244                 sectorsize = test_sectorsize[i];
245                 for (nodesize = sectorsize;
246                      nodesize <= BTRFS_MAX_METADATA_BLOCKSIZE;
247                      nodesize <<= 1) {
248                         pr_info("BTRFS: selftest: sectorsize: %u  nodesize: %u\n",
249                                 sectorsize, nodesize);
250                         ret = btrfs_test_free_space_cache(sectorsize, nodesize);
251                         if (ret)
252                                 goto out;
253                         ret = btrfs_test_extent_buffer_operations(sectorsize,
254                                 nodesize);
255                         if (ret)
256                                 goto out;
257                         ret = btrfs_test_extent_io(sectorsize, nodesize);
258                         if (ret)
259                                 goto out;
260                         ret = btrfs_test_inodes(sectorsize, nodesize);
261                         if (ret)
262                                 goto out;
263                         ret = btrfs_test_qgroups(sectorsize, nodesize);
264                         if (ret)
265                                 goto out;
266                         ret = btrfs_test_free_space_tree(sectorsize, nodesize);
267                         if (ret)
268                                 goto out;
269                 }
270         }
271         ret = btrfs_test_extent_map();
272
273 out:
274         btrfs_destroy_test_fs();
275         return ret;
276 }