btrfs/tests/btrfs-tests.c

0001 // SPDX-License-Identifier: GPL-2.0
0002 /*
0003  * Copyright (C) 2013 Fusion IO.  All rights reserved.
0004  */
0005
0006 #include <linux/fs.h>
0007 #include <linux/mount.h>
0008 #include <linux/pseudo_fs.h>
0009 #include <linux/magic.h>
0010 #include "btrfs-tests.h"
0011 #include "../ctree.h"
0012 #include "../free-space-cache.h"
0013 #include "../free-space-tree.h"
0014 #include "../transaction.h"
0015 #include "../volumes.h"
0016 #include "../disk-io.h"
0017 #include "../qgroup.h"
0018 #include "../block-group.h"
0019
0020 static struct vfsmount *test_mnt = NULL;
0021
0022 const char *test_error[] = {
0023     [TEST_ALLOC_FS_INFO]         = "cannot allocate fs_info",
0024     [TEST_ALLOC_ROOT]        = "cannot allocate root",
0025     [TEST_ALLOC_EXTENT_BUFFER]   = "cannot extent buffer",
0026     [TEST_ALLOC_PATH]        = "cannot allocate path",
0027     [TEST_ALLOC_INODE]       = "cannot allocate inode",
0028     [TEST_ALLOC_BLOCK_GROUP]     = "cannot allocate block group",
0029     [TEST_ALLOC_EXTENT_MAP]      = "cannot allocate extent map",
0030 };
0031
0032 static const struct super_operations btrfs_test_super_ops = {
0033     .alloc_inode    = btrfs_alloc_inode,
0034     .destroy_inode  = btrfs_test_destroy_inode,
0035 };
0036
0037
0038 static int btrfs_test_init_fs_context(struct fs_context *fc)
0039 {
0040     struct pseudo_fs_context *ctx = init_pseudo(fc, BTRFS_TEST_MAGIC);
0041     if (!ctx)
0042         return -ENOMEM;
0043     ctx->ops = &btrfs_test_super_ops;
0044     return 0;
0045 }
0046
0047 static struct file_system_type test_type = {
0048     .name       = "btrfs_test_fs",
0049     .init_fs_context = btrfs_test_init_fs_context,
0050     .kill_sb    = kill_anon_super,
0051 };
0052
0053 struct inode *btrfs_new_test_inode(void)
0054 {
0055     struct inode *inode;
0056
0057     inode = new_inode(test_mnt->mnt_sb);
0058     if (!inode)
0059         return NULL;
0060
0061     inode->i_mode = S_IFREG;
0062     inode->i_ino = BTRFS_FIRST_FREE_OBJECTID;
0063     BTRFS_I(inode)->location.type = BTRFS_INODE_ITEM_KEY;
0064     BTRFS_I(inode)->location.objectid = BTRFS_FIRST_FREE_OBJECTID;
0065     BTRFS_I(inode)->location.offset = 0;
0066     inode_init_owner(&init_user_ns, inode, NULL, S_IFREG);
0067
0068     return inode;
0069 }
0070
0071 static int btrfs_init_test_fs(void)
0072 {
0073     int ret;
0074
0075     ret = register_filesystem(&test_type);
0076     if (ret) {
0077         printk(KERN_ERR "btrfs: cannot register test file system\n");
0078         return ret;
0079     }
0080
0081     test_mnt = kern_mount(&test_type);
0082     if (IS_ERR(test_mnt)) {
0083         printk(KERN_ERR "btrfs: cannot mount test file system\n");
0084         unregister_filesystem(&test_type);
0085         return PTR_ERR(test_mnt);
0086     }
0087     return 0;
0088 }
0089
0090 static void btrfs_destroy_test_fs(void)
0091 {
0092     kern_unmount(test_mnt);
0093     unregister_filesystem(&test_type);
0094 }
0095
0096 struct btrfs_device *btrfs_alloc_dummy_device(struct btrfs_fs_info *fs_info)
0097 {
0098     struct btrfs_device *dev;
0099
0100     dev = kzalloc(sizeof(*dev), GFP_KERNEL);
0101     if (!dev)
0102         return ERR_PTR(-ENOMEM);
0103
0104     extent_io_tree_init(NULL, &dev->alloc_state, 0, NULL);
0105     INIT_LIST_HEAD(&dev->dev_list);
0106     list_add(&dev->dev_list, &fs_info->fs_devices->devices);
0107
0108     return dev;
0109 }
0110
0111 static void btrfs_free_dummy_device(struct btrfs_device *dev)
0112 {
0113     extent_io_tree_release(&dev->alloc_state);
0114     kfree(dev);
0115 }
0116
0117 struct btrfs_fs_info *btrfs_alloc_dummy_fs_info(u32 nodesize, u32 sectorsize)
0118 {
0119     struct btrfs_fs_info *fs_info = kzalloc(sizeof(struct btrfs_fs_info),
0120                         GFP_KERNEL);
0121
0122     if (!fs_info)
0123         return fs_info;
0124     fs_info->fs_devices = kzalloc(sizeof(struct btrfs_fs_devices),
0125                       GFP_KERNEL);
0126     if (!fs_info->fs_devices) {
0127         kfree(fs_info);
0128         return NULL;
0129     }
0130     INIT_LIST_HEAD(&fs_info->fs_devices->devices);
0131
0132     fs_info->super_copy = kzalloc(sizeof(struct btrfs_super_block),
0133                       GFP_KERNEL);
0134     if (!fs_info->super_copy) {
0135         kfree(fs_info->fs_devices);
0136         kfree(fs_info);
0137         return NULL;
0138     }
0139
0140     btrfs_init_fs_info(fs_info);
0141
0142     fs_info->nodesize = nodesize;
0143     fs_info->sectorsize = sectorsize;
0144     fs_info->sectorsize_bits = ilog2(sectorsize);
0145     set_bit(BTRFS_FS_STATE_DUMMY_FS_INFO, &fs_info->fs_state);
0146
0147     test_mnt->mnt_sb->s_fs_info = fs_info;
0148
0149     return fs_info;
0150 }
0151
0152 void btrfs_free_dummy_fs_info(struct btrfs_fs_info *fs_info)
0153 {
0154     struct radix_tree_iter iter;
0155     void **slot;
0156     struct btrfs_device *dev, *tmp;
0157
0158     if (!fs_info)
0159         return;
0160
0161     if (WARN_ON(!test_bit(BTRFS_FS_STATE_DUMMY_FS_INFO,
0162                   &fs_info->fs_state)))
0163         return;
0164
0165     test_mnt->mnt_sb->s_fs_info = NULL;
0166
0167     spin_lock(&fs_info->buffer_lock);
0168     radix_tree_for_each_slot(slot, &fs_info->buffer_radix, &iter, 0) {
0169         struct extent_buffer *eb;
0170
0171         eb = radix_tree_deref_slot_protected(slot, &fs_info->buffer_lock);
0172         if (!eb)
0173             continue;
0174         /* Shouldn't happen but that kind of thinking creates CVE's */
0175         if (radix_tree_exception(eb)) {
0176             if (radix_tree_deref_retry(eb))
0177                 slot = radix_tree_iter_retry(&iter);
0178             continue;
0179         }
0180         slot = radix_tree_iter_resume(slot, &iter);
0181         spin_unlock(&fs_info->buffer_lock);
0182         free_extent_buffer_stale(eb);
0183         spin_lock(&fs_info->buffer_lock);
0184     }
0185     spin_unlock(&fs_info->buffer_lock);
0186
0187     btrfs_mapping_tree_free(&fs_info->mapping_tree);
0188     list_for_each_entry_safe(dev, tmp, &fs_info->fs_devices->devices,
0189                  dev_list) {
0190         btrfs_free_dummy_device(dev);
0191     }
0192     btrfs_free_qgroup_config(fs_info);
0193     btrfs_free_fs_roots(fs_info);
0194     kfree(fs_info->super_copy);
0195     btrfs_check_leaked_roots(fs_info);
0196     btrfs_extent_buffer_leak_debug_check(fs_info);
0197     kfree(fs_info->fs_devices);
0198     kfree(fs_info);
0199 }
0200
0201 void btrfs_free_dummy_root(struct btrfs_root *root)
0202 {
0203     if (!root)
0204         return;
0205     /* Will be freed by btrfs_free_fs_roots */
0206     if (WARN_ON(test_bit(BTRFS_ROOT_IN_RADIX, &root->state)))
0207         return;
0208     btrfs_global_root_delete(root);
0209     btrfs_put_root(root);
0210 }
0211
0212 struct btrfs_block_group *
0213 btrfs_alloc_dummy_block_group(struct btrfs_fs_info *fs_info,
0214                   unsigned long length)
0215 {
0216     struct btrfs_block_group *cache;
0217
0218     cache = kzalloc(sizeof(*cache), GFP_KERNEL);
0219     if (!cache)
0220         return NULL;
0221     cache->free_space_ctl = kzalloc(sizeof(*cache->free_space_ctl),
0222                     GFP_KERNEL);
0223     if (!cache->free_space_ctl) {
0224         kfree(cache);
0225         return NULL;
0226     }
0227
0228     cache->start = 0;
0229     cache->length = length;
0230     cache->full_stripe_len = fs_info->sectorsize;
0231     cache->fs_info = fs_info;
0232
0233     INIT_LIST_HEAD(&cache->list);
0234     INIT_LIST_HEAD(&cache->cluster_list);
0235     INIT_LIST_HEAD(&cache->bg_list);
0236     btrfs_init_free_space_ctl(cache, cache->free_space_ctl);
0237     mutex_init(&cache->free_space_lock);
0238
0239     return cache;
0240 }
0241
0242 void btrfs_free_dummy_block_group(struct btrfs_block_group *cache)
0243 {
0244     if (!cache)
0245         return;
0246     __btrfs_remove_free_space_cache(cache->free_space_ctl);
0247     kfree(cache->free_space_ctl);
0248     kfree(cache);
0249 }
0250
0251 void btrfs_init_dummy_trans(struct btrfs_trans_handle *trans,
0252                 struct btrfs_fs_info *fs_info)
0253 {
0254     memset(trans, 0, sizeof(*trans));
0255     trans->transid = 1;
0256     trans->type = __TRANS_DUMMY;
0257     trans->fs_info = fs_info;
0258 }
0259
0260 int btrfs_run_sanity_tests(void)
0261 {
0262     int ret, i;
0263     u32 sectorsize, nodesize;
0264     u32 test_sectorsize[] = {
0265         PAGE_SIZE,
0266     };
0267     ret = btrfs_init_test_fs();
0268     if (ret)
0269         return ret;
0270     for (i = 0; i < ARRAY_SIZE(test_sectorsize); i++) {
0271         sectorsize = test_sectorsize[i];
0272         for (nodesize = sectorsize;
0273              nodesize <= BTRFS_MAX_METADATA_BLOCKSIZE;
0274              nodesize <<= 1) {
0275             pr_info("BTRFS: selftest: sectorsize: %u  nodesize: %u\n",
0276                 sectorsize, nodesize);
0277             ret = btrfs_test_free_space_cache(sectorsize, nodesize);
0278             if (ret)
0279                 goto out;
0280             ret = btrfs_test_extent_buffer_operations(sectorsize,
0281                 nodesize);
0282             if (ret)
0283                 goto out;
0284             ret = btrfs_test_extent_io(sectorsize, nodesize);
0285             if (ret)
0286                 goto out;
0287             ret = btrfs_test_inodes(sectorsize, nodesize);
0288             if (ret)
0289                 goto out;
0290             ret = btrfs_test_qgroups(sectorsize, nodesize);
0291             if (ret)
0292                 goto out;
0293             ret = btrfs_test_free_space_tree(sectorsize, nodesize);
0294             if (ret)
0295                 goto out;
0296         }
0297     }
0298     ret = btrfs_test_extent_map();
0299
0300 out:
0301     btrfs_destroy_test_fs();
0302     return ret;
0303 }