Quelle  btrfs-tests.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (C) 2013 Fusion IO.  All rights reserved.
 */

#include <linux/fs.h>
#include <linux/mount.h>
#include <linux/pseudo_fs.h>
#include <linux/magic.h>
#include "btrfs-tests.h"
#include "../ctree.h"
#include "../free-space-cache.h"
#include "../free-space-tree.h"
#include "../transaction.h"
#include "../volumes.h"
#include "../disk-io.h"
#include "../qgroup.h"
#include "../block-group.h"
#include "../fs.h"

static struct vfsmount *test_mnt = NULL;

const char *test_error[] = {
 [TEST_ALLOC_FS_INFO]      = "cannot allocate fs_info",
 [TEST_ALLOC_ROOT]      = "cannot allocate root",
 [TEST_ALLOC_EXTENT_BUFFER]   = "cannot extent buffer",
 [TEST_ALLOC_PATH]      = "cannot allocate path",
 [TEST_ALLOC_INODE]      = "cannot allocate inode",
 [TEST_ALLOC_BLOCK_GROUP]     = "cannot allocate block group",
 [TEST_ALLOC_EXTENT_MAP]      = "cannot allocate extent map",
 [TEST_ALLOC_CHUNK_MAP]       = "cannot allocate chunk map",
 [TEST_ALLOC_IO_CONTEXT]      = "cannot allocate io context",
 [TEST_ALLOC_TRANSACTION]     = "cannot allocate transaction",
};

static const struct super_operations btrfs_test_super_ops = {
 .alloc_inode = btrfs_alloc_inode,
 .destroy_inode = btrfs_test_destroy_inode,
};


static int btrfs_test_init_fs_context(struct fs_context *fc)
{
 struct pseudo_fs_context *ctx = init_pseudo(fc, BTRFS_TEST_MAGIC);
 if (!ctx)
  return -ENOMEM;
 ctx->ops = &btrfs_test_super_ops;
 return 0;
}

static struct file_system_type test_type = {
 .name  = "btrfs_test_fs",
 .init_fs_context = btrfs_test_init_fs_context,
 .kill_sb = kill_anon_super,
};

struct inode *btrfs_new_test_inode(void)
{
 struct inode *inode;

 inode = new_inode(test_mnt->mnt_sb);
 if (!inode)
  return NULL;

 inode->i_mode = S_IFREG;
 btrfs_set_inode_number(BTRFS_I(inode), BTRFS_FIRST_FREE_OBJECTID);
 inode_init_owner(&nop_mnt_idmap, inode, NULL, S_IFREG);

 return inode;
}

static int btrfs_init_test_fs(void)
{
 int ret;

 ret = register_filesystem(&test_type);
 if (ret) {
  printk(KERN_ERR "btrfs: cannot register test file system\n");
  return ret;
 }

 test_mnt = kern_mount(&test_type);
 if (IS_ERR(test_mnt)) {
  printk(KERN_ERR "btrfs: cannot mount test file system\n");
  unregister_filesystem(&test_type);
  return PTR_ERR(test_mnt);
 }
 return 0;
}

static void btrfs_destroy_test_fs(void)
{
 kern_unmount(test_mnt);
 unregister_filesystem(&test_type);
}

struct btrfs_device *btrfs_alloc_dummy_device(struct btrfs_fs_info *fs_info)
{
 struct btrfs_device *dev;

 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
 if (!dev)
  return ERR_PTR(-ENOMEM);

 btrfs_extent_io_tree_init(fs_info, &dev->alloc_state, 0);
 INIT_LIST_HEAD(&dev->dev_list);
 list_add(&dev->dev_list, &fs_info->fs_devices->devices);

 return dev;
}

static void btrfs_free_dummy_device(struct btrfs_device *dev)
{
 btrfs_extent_io_tree_release(&dev->alloc_state);
 kfree(dev);
}

struct btrfs_fs_info *btrfs_alloc_dummy_fs_info(u32 nodesize, u32 sectorsize)
{
 struct btrfs_fs_info *fs_info = kzalloc(sizeof(struct btrfs_fs_info),
      GFP_KERNEL);

 if (!fs_info)
  return fs_info;
 fs_info->fs_devices = kzalloc(sizeof(struct btrfs_fs_devices),
          GFP_KERNEL);
 if (!fs_info->fs_devices) {
  kfree(fs_info);
  return NULL;
 }
 INIT_LIST_HEAD(&fs_info->fs_devices->devices);

 fs_info->super_copy = kzalloc(sizeof(struct btrfs_super_block),
          GFP_KERNEL);
 if (!fs_info->super_copy) {
  kfree(fs_info->fs_devices);
  kfree(fs_info);
  return NULL;
 }

 btrfs_init_fs_info(fs_info);

 fs_info->nodesize = nodesize;
 fs_info->sectorsize = sectorsize;
 fs_info->sectorsize_bits = ilog2(sectorsize);

 /* CRC32C csum size. */
 fs_info->csum_size = 4;
 fs_info->csums_per_leaf = BTRFS_MAX_ITEM_SIZE(fs_info) /
  fs_info->csum_size;
 set_bit(BTRFS_FS_STATE_DUMMY_FS_INFO, &fs_info->fs_state);

 test_mnt->mnt_sb->s_fs_info = fs_info;

 return fs_info;
}

void btrfs_free_dummy_fs_info(struct btrfs_fs_info *fs_info)
{
 struct btrfs_device *dev, *tmp;
 struct extent_buffer *eb;
 unsigned long index;

 if (!fs_info)
  return;

 if (WARN_ON(!btrfs_is_testing(fs_info)))
  return;

 test_mnt->mnt_sb->s_fs_info = NULL;

 xa_lock_irq(&fs_info->buffer_tree);
 xa_for_each(&fs_info->buffer_tree, index, eb) {
  xa_unlock_irq(&fs_info->buffer_tree);
  free_extent_buffer(eb);
  xa_lock_irq(&fs_info->buffer_tree);
 }
 xa_unlock_irq(&fs_info->buffer_tree);

 btrfs_mapping_tree_free(fs_info);
 list_for_each_entry_safe(dev, tmp, &fs_info->fs_devices->devices,
     dev_list) {
  btrfs_free_dummy_device(dev);
 }
 btrfs_free_qgroup_config(fs_info);
 btrfs_free_fs_roots(fs_info);
 kfree(fs_info->super_copy);
 btrfs_check_leaked_roots(fs_info);
 btrfs_extent_buffer_leak_debug_check(fs_info);
 kfree(fs_info->fs_devices);
 kfree(fs_info);
}

void btrfs_free_dummy_root(struct btrfs_root *root)
{
 if (IS_ERR_OR_NULL(root))
  return;
 /* Will be freed by btrfs_free_fs_roots */
 if (WARN_ON(test_bit(BTRFS_ROOT_IN_RADIX, &root->state)))
  return;
 btrfs_global_root_delete(root);
 btrfs_put_root(root);
}

struct btrfs_block_group *
btrfs_alloc_dummy_block_group(struct btrfs_fs_info *fs_info,
         unsigned long length)
{
 struct btrfs_block_group *cache;

 cache = kzalloc(sizeof(*cache), GFP_KERNEL);
 if (!cache)
  return NULL;
 cache->free_space_ctl = kzalloc(sizeof(*cache->free_space_ctl),
     GFP_KERNEL);
 if (!cache->free_space_ctl) {
  kfree(cache);
  return NULL;
 }

 cache->start = 0;
 cache->length = length;
 cache->full_stripe_len = fs_info->sectorsize;
 cache->fs_info = fs_info;

 INIT_LIST_HEAD(&cache->list);
 INIT_LIST_HEAD(&cache->cluster_list);
 INIT_LIST_HEAD(&cache->bg_list);
 btrfs_init_free_space_ctl(cache, cache->free_space_ctl);
 mutex_init(&cache->free_space_lock);

 return cache;
}

void btrfs_free_dummy_block_group(struct btrfs_block_group *cache)
{
 if (!cache)
  return;
 btrfs_remove_free_space_cache(cache);
 kfree(cache->free_space_ctl);
 kfree(cache);
}

void btrfs_init_dummy_transaction(struct btrfs_transaction *trans, struct btrfs_fs_info *fs_info)
{
 memset(trans, 0, sizeof(*trans));
 trans->fs_info = fs_info;
 xa_init(&trans->delayed_refs.head_refs);
 xa_init(&trans->delayed_refs.dirty_extents);
 spin_lock_init(&trans->delayed_refs.lock);
}

void btrfs_init_dummy_trans(struct btrfs_trans_handle *trans,
       struct btrfs_fs_info *fs_info)
{
 memset(trans, 0, sizeof(*trans));
 trans->transid = 1;
 trans->type = __TRANS_DUMMY;
 trans->fs_info = fs_info;
}

int btrfs_run_sanity_tests(void)
{
 int ret, i;
 u32 sectorsize, nodesize;
 u32 test_sectorsize[] = {
  PAGE_SIZE,
 };
 ret = btrfs_init_test_fs();
 if (ret)
  return ret;
 for (i = 0; i < ARRAY_SIZE(test_sectorsize); i++) {
  sectorsize = test_sectorsize[i];
  for (nodesize = sectorsize;
       nodesize <= BTRFS_MAX_METADATA_BLOCKSIZE;
       nodesize <<= 1) {
   pr_info("BTRFS: selftest: sectorsize: %u nodesize: %u\n",
    sectorsize, nodesize);
   ret = btrfs_test_free_space_cache(sectorsize, nodesize);
   if (ret)
    goto out;
   ret = btrfs_test_extent_buffer_operations(sectorsize,
    nodesize);
   if (ret)
    goto out;
   ret = btrfs_test_extent_io(sectorsize, nodesize);
   if (ret)
    goto out;
   ret = btrfs_test_inodes(sectorsize, nodesize);
   if (ret)
    goto out;
   ret = btrfs_test_qgroups(sectorsize, nodesize);
   if (ret)
    goto out;
   ret = btrfs_test_free_space_tree(sectorsize, nodesize);
   if (ret)
    goto out;
   ret = btrfs_test_raid_stripe_tree(sectorsize, nodesize);
   if (ret)
    goto out;
   ret = btrfs_test_delayed_refs(sectorsize, nodesize);
   if (ret)
    goto out;
  }
 }
 ret = btrfs_test_extent_map();

out:
 btrfs_destroy_test_fs();
 return ret;
}