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linux/fs/btrfs/tests/qgroup-tests.c
Filipe Manana a2c8d27e5e btrfs: use a structure to pass arguments to backref walking functions 
The public backref walking functions have quite a lot of arguments that
are passed down the call stack to find_parent_nodes(), the core function
of the backref walking code.

The next patches in series will need to add even arguments to these
functions that should be passed not only to find_parent_nodes(), but also
to other functions used by the later (directly or even lower in the call
stack).

So create a structure to hold all these arguments and state used by the
main backref walking function, find_parent_nodes(), and use it as the
argument for the public backref walking functions iterate_extent_inodes(),
btrfs_find_all_leafs() and btrfs_find_all_roots().

Signed-off-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
2022-12-05 18:00:50 +01:00

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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2013 Facebook. All rights reserved.
*/
#include <linux/types.h>
#include "btrfs-tests.h"
#include "../ctree.h"
#include "../transaction.h"
#include "../disk-io.h"
#include "../qgroup.h"
#include "../backref.h"
#include "../fs.h"
#include "../accessors.h"
static int insert_normal_tree_ref(struct btrfs_root *root, u64 bytenr,
u64 num_bytes, u64 parent, u64 root_objectid)
{
struct btrfs_trans_handle trans;
struct btrfs_extent_item *item;
struct btrfs_extent_inline_ref *iref;
struct btrfs_tree_block_info *block_info;
struct btrfs_path *path;
struct extent_buffer *leaf;
struct btrfs_key ins;
u32 size = sizeof(*item) + sizeof(*iref) + sizeof(*block_info);
int ret;
btrfs_init_dummy_trans(&trans, NULL);
ins.objectid = bytenr;
ins.type = BTRFS_EXTENT_ITEM_KEY;
ins.offset = num_bytes;
path = btrfs_alloc_path();
if (!path) {
test_std_err(TEST_ALLOC_ROOT);
return -ENOMEM;
}
ret = btrfs_insert_empty_item(&trans, root, path, &ins, size);
if (ret) {
test_err("couldn't insert ref %d", ret);
btrfs_free_path(path);
return ret;
}
leaf = path->nodes[0];
item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item);
btrfs_set_extent_refs(leaf, item, 1);
btrfs_set_extent_generation(leaf, item, 1);
btrfs_set_extent_flags(leaf, item, BTRFS_EXTENT_FLAG_TREE_BLOCK);
block_info = (struct btrfs_tree_block_info *)(item + 1);
btrfs_set_tree_block_level(leaf, block_info, 0);
iref = (struct btrfs_extent_inline_ref *)(block_info + 1);
if (parent > 0) {
btrfs_set_extent_inline_ref_type(leaf, iref,
BTRFS_SHARED_BLOCK_REF_KEY);
btrfs_set_extent_inline_ref_offset(leaf, iref, parent);
} else {
btrfs_set_extent_inline_ref_type(leaf, iref, BTRFS_TREE_BLOCK_REF_KEY);
btrfs_set_extent_inline_ref_offset(leaf, iref, root_objectid);
}
btrfs_free_path(path);
return 0;
}
static int add_tree_ref(struct btrfs_root *root, u64 bytenr, u64 num_bytes,
u64 parent, u64 root_objectid)
{
struct btrfs_trans_handle trans;
struct btrfs_extent_item *item;
struct btrfs_path *path;
struct btrfs_key key;
u64 refs;
int ret;
btrfs_init_dummy_trans(&trans, NULL);
key.objectid = bytenr;
key.type = BTRFS_EXTENT_ITEM_KEY;
key.offset = num_bytes;
path = btrfs_alloc_path();
if (!path) {
test_std_err(TEST_ALLOC_ROOT);
return -ENOMEM;
}
ret = btrfs_search_slot(&trans, root, &key, path, 0, 1);
if (ret) {
test_err("couldn't find extent ref");
btrfs_free_path(path);
return ret;
}
item = btrfs_item_ptr(path->nodes[0], path->slots[0],
struct btrfs_extent_item);
refs = btrfs_extent_refs(path->nodes[0], item);
btrfs_set_extent_refs(path->nodes[0], item, refs + 1);
btrfs_release_path(path);
key.objectid = bytenr;
if (parent) {
key.type = BTRFS_SHARED_BLOCK_REF_KEY;
key.offset = parent;
} else {
key.type = BTRFS_TREE_BLOCK_REF_KEY;
key.offset = root_objectid;
}
ret = btrfs_insert_empty_item(&trans, root, path, &key, 0);
if (ret)
test_err("failed to insert backref");
btrfs_free_path(path);
return ret;
}
static int remove_extent_item(struct btrfs_root *root, u64 bytenr,
u64 num_bytes)
{
struct btrfs_trans_handle trans;
struct btrfs_key key;
struct btrfs_path *path;
int ret;
btrfs_init_dummy_trans(&trans, NULL);
key.objectid = bytenr;
key.type = BTRFS_EXTENT_ITEM_KEY;
key.offset = num_bytes;
path = btrfs_alloc_path();
if (!path) {
test_std_err(TEST_ALLOC_ROOT);
return -ENOMEM;
}
ret = btrfs_search_slot(&trans, root, &key, path, -1, 1);
if (ret) {
test_err("didn't find our key %d", ret);
btrfs_free_path(path);
return ret;
}
btrfs_del_item(&trans, root, path);
btrfs_free_path(path);
return 0;
}
static int remove_extent_ref(struct btrfs_root *root, u64 bytenr,
u64 num_bytes, u64 parent, u64 root_objectid)
{
struct btrfs_trans_handle trans;
struct btrfs_extent_item *item;
struct btrfs_path *path;
struct btrfs_key key;
u64 refs;
int ret;
btrfs_init_dummy_trans(&trans, NULL);
key.objectid = bytenr;
key.type = BTRFS_EXTENT_ITEM_KEY;
key.offset = num_bytes;
path = btrfs_alloc_path();
if (!path) {
test_std_err(TEST_ALLOC_ROOT);
return -ENOMEM;
}
ret = btrfs_search_slot(&trans, root, &key, path, 0, 1);
if (ret) {
test_err("couldn't find extent ref");
btrfs_free_path(path);
return ret;
}
item = btrfs_item_ptr(path->nodes[0], path->slots[0],
struct btrfs_extent_item);
refs = btrfs_extent_refs(path->nodes[0], item);
btrfs_set_extent_refs(path->nodes[0], item, refs - 1);
btrfs_release_path(path);
key.objectid = bytenr;
if (parent) {
key.type = BTRFS_SHARED_BLOCK_REF_KEY;
key.offset = parent;
} else {
key.type = BTRFS_TREE_BLOCK_REF_KEY;
key.offset = root_objectid;
}
ret = btrfs_search_slot(&trans, root, &key, path, -1, 1);
if (ret) {
test_err("couldn't find backref %d", ret);
btrfs_free_path(path);
return ret;
}
btrfs_del_item(&trans, root, path);
btrfs_free_path(path);
return ret;
}
static int test_no_shared_qgroup(struct btrfs_root *root,
u32 sectorsize, u32 nodesize)
{
struct btrfs_backref_walk_ctx ctx = { 0 };
struct btrfs_trans_handle trans;
struct btrfs_fs_info *fs_info = root->fs_info;
struct ulist *old_roots = NULL;
struct ulist *new_roots = NULL;
int ret;
btrfs_init_dummy_trans(&trans, fs_info);
test_msg("running qgroup add/remove tests");
ret = btrfs_create_qgroup(&trans, BTRFS_FS_TREE_OBJECTID);
if (ret) {
test_err("couldn't create a qgroup %d", ret);
return ret;
}
ctx.bytenr = nodesize;
ctx.trans = &trans;
ctx.fs_info = fs_info;
/*
* Since the test trans doesn't have the complicated delayed refs,
* we can only call btrfs_qgroup_account_extent() directly to test
* quota.
*/
ret = btrfs_find_all_roots(&ctx, false);
if (ret) {
test_err("couldn't find old roots: %d", ret);
return ret;
}
old_roots = ctx.roots;
ctx.roots = NULL;
ret = insert_normal_tree_ref(root, nodesize, nodesize, 0,
BTRFS_FS_TREE_OBJECTID);
if (ret) {
ulist_free(old_roots);
return ret;
}
ret = btrfs_find_all_roots(&ctx, false);
if (ret) {
ulist_free(old_roots);
test_err("couldn't find old roots: %d", ret);
return ret;
}
new_roots = ctx.roots;
ctx.roots = NULL;
ret = btrfs_qgroup_account_extent(&trans, nodesize, nodesize, old_roots,
new_roots);
if (ret) {
test_err("couldn't account space for a qgroup %d", ret);
return ret;
}
/* btrfs_qgroup_account_extent() always frees the ulists passed to it. */
old_roots = NULL;
new_roots = NULL;
if (btrfs_verify_qgroup_counts(fs_info, BTRFS_FS_TREE_OBJECTID,
nodesize, nodesize)) {
test_err("qgroup counts didn't match expected values");
return -EINVAL;
}
ret = btrfs_find_all_roots(&ctx, false);
if (ret) {
test_err("couldn't find old roots: %d", ret);
return ret;
}
old_roots = ctx.roots;
ctx.roots = NULL;
ret = remove_extent_item(root, nodesize, nodesize);
if (ret) {
ulist_free(old_roots);
return -EINVAL;
}
ret = btrfs_find_all_roots(&ctx, false);
if (ret) {
ulist_free(old_roots);
test_err("couldn't find old roots: %d", ret);
return ret;
}
new_roots = ctx.roots;
ctx.roots = NULL;
ret = btrfs_qgroup_account_extent(&trans, nodesize, nodesize, old_roots,
new_roots);
if (ret) {
test_err("couldn't account space for a qgroup %d", ret);
return -EINVAL;
}
if (btrfs_verify_qgroup_counts(fs_info, BTRFS_FS_TREE_OBJECTID, 0, 0)) {
test_err("qgroup counts didn't match expected values");
return -EINVAL;
}
return 0;
}
/*
* Add a ref for two different roots to make sure the shared value comes out
* right, also remove one of the roots and make sure the exclusive count is
* adjusted properly.
*/
static int test_multiple_refs(struct btrfs_root *root,
u32 sectorsize, u32 nodesize)
{
struct btrfs_backref_walk_ctx ctx = { 0 };
struct btrfs_trans_handle trans;
struct btrfs_fs_info *fs_info = root->fs_info;
struct ulist *old_roots = NULL;
struct ulist *new_roots = NULL;
int ret;
btrfs_init_dummy_trans(&trans, fs_info);
test_msg("running qgroup multiple refs test");
/*
* We have BTRFS_FS_TREE_OBJECTID created already from the
* previous test.
*/
ret = btrfs_create_qgroup(&trans, BTRFS_FIRST_FREE_OBJECTID);
if (ret) {
test_err("couldn't create a qgroup %d", ret);
return ret;
}
ctx.bytenr = nodesize;
ctx.trans = &trans;
ctx.fs_info = fs_info;
ret = btrfs_find_all_roots(&ctx, false);
if (ret) {
test_err("couldn't find old roots: %d", ret);
return ret;
}
old_roots = ctx.roots;
ctx.roots = NULL;
ret = insert_normal_tree_ref(root, nodesize, nodesize, 0,
BTRFS_FS_TREE_OBJECTID);
if (ret) {
ulist_free(old_roots);
return ret;
}
ret = btrfs_find_all_roots(&ctx, false);
if (ret) {
ulist_free(old_roots);
test_err("couldn't find old roots: %d", ret);
return ret;
}
new_roots = ctx.roots;
ctx.roots = NULL;
ret = btrfs_qgroup_account_extent(&trans, nodesize, nodesize, old_roots,
new_roots);
if (ret) {
test_err("couldn't account space for a qgroup %d", ret);
return ret;
}
if (btrfs_verify_qgroup_counts(fs_info, BTRFS_FS_TREE_OBJECTID,
nodesize, nodesize)) {
test_err("qgroup counts didn't match expected values");
return -EINVAL;
}
ret = btrfs_find_all_roots(&ctx, false);
if (ret) {
test_err("couldn't find old roots: %d", ret);
return ret;
}
old_roots = ctx.roots;
ctx.roots = NULL;
ret = add_tree_ref(root, nodesize, nodesize, 0,
BTRFS_FIRST_FREE_OBJECTID);
if (ret) {
ulist_free(old_roots);
return ret;
}
ret = btrfs_find_all_roots(&ctx, false);
if (ret) {
ulist_free(old_roots);
test_err("couldn't find old roots: %d", ret);
return ret;
}
new_roots = ctx.roots;
ctx.roots = NULL;
ret = btrfs_qgroup_account_extent(&trans, nodesize, nodesize, old_roots,
new_roots);
if (ret) {
test_err("couldn't account space for a qgroup %d", ret);
return ret;
}
if (btrfs_verify_qgroup_counts(fs_info, BTRFS_FS_TREE_OBJECTID,
nodesize, 0)) {
test_err("qgroup counts didn't match expected values");
return -EINVAL;
}
if (btrfs_verify_qgroup_counts(fs_info, BTRFS_FIRST_FREE_OBJECTID,
nodesize, 0)) {
test_err("qgroup counts didn't match expected values");
return -EINVAL;
}
ret = btrfs_find_all_roots(&ctx, false);
if (ret) {
test_err("couldn't find old roots: %d", ret);
return ret;
}
old_roots = ctx.roots;
ctx.roots = NULL;
ret = remove_extent_ref(root, nodesize, nodesize, 0,
BTRFS_FIRST_FREE_OBJECTID);
if (ret) {
ulist_free(old_roots);
return ret;
}
ret = btrfs_find_all_roots(&ctx, false);
if (ret) {
ulist_free(old_roots);
test_err("couldn't find old roots: %d", ret);
return ret;
}
new_roots = ctx.roots;
ctx.roots = NULL;
ret = btrfs_qgroup_account_extent(&trans, nodesize, nodesize, old_roots,
new_roots);
if (ret) {
test_err("couldn't account space for a qgroup %d", ret);
return ret;
}
if (btrfs_verify_qgroup_counts(fs_info, BTRFS_FIRST_FREE_OBJECTID,
0, 0)) {
test_err("qgroup counts didn't match expected values");
return -EINVAL;
}
if (btrfs_verify_qgroup_counts(fs_info, BTRFS_FS_TREE_OBJECTID,
nodesize, nodesize)) {
test_err("qgroup counts didn't match expected values");
return -EINVAL;
}
return 0;
}
int btrfs_test_qgroups(u32 sectorsize, u32 nodesize)
{
struct btrfs_fs_info *fs_info = NULL;
struct btrfs_root *root;
struct btrfs_root *tmp_root;
int ret = 0;
fs_info = btrfs_alloc_dummy_fs_info(nodesize, sectorsize);
if (!fs_info) {
test_std_err(TEST_ALLOC_FS_INFO);
return -ENOMEM;
}
root = btrfs_alloc_dummy_root(fs_info);
if (IS_ERR(root)) {
test_std_err(TEST_ALLOC_ROOT);
ret = PTR_ERR(root);
goto out;
}
/* We are using this root as our extent root */
root->root_key.objectid = BTRFS_EXTENT_TREE_OBJECTID;
root->root_key.type = BTRFS_ROOT_ITEM_KEY;
root->root_key.offset = 0;
btrfs_global_root_insert(root);
/*
* Some of the paths we test assume we have a filled out fs_info, so we
* just need to add the root in there so we don't panic.
*/
root->fs_info->tree_root = root;
root->fs_info->quota_root = root;
set_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags);
/*
* Can't use bytenr 0, some things freak out
* *cough*backref walking code*cough*
*/
root->node = alloc_test_extent_buffer(root->fs_info, nodesize);
if (IS_ERR(root->node)) {
test_err("couldn't allocate dummy buffer");
ret = PTR_ERR(root->node);
goto out;
}
btrfs_set_header_level(root->node, 0);
btrfs_set_header_nritems(root->node, 0);
root->alloc_bytenr += 2 * nodesize;
tmp_root = btrfs_alloc_dummy_root(fs_info);
if (IS_ERR(tmp_root)) {
test_std_err(TEST_ALLOC_ROOT);
ret = PTR_ERR(tmp_root);
goto out;
}
tmp_root->root_key.objectid = BTRFS_FS_TREE_OBJECTID;
root->fs_info->fs_root = tmp_root;
ret = btrfs_insert_fs_root(root->fs_info, tmp_root);
if (ret) {
test_err("couldn't insert fs root %d", ret);
goto out;
}
btrfs_put_root(tmp_root);
tmp_root = btrfs_alloc_dummy_root(fs_info);
if (IS_ERR(tmp_root)) {
test_std_err(TEST_ALLOC_ROOT);
ret = PTR_ERR(tmp_root);
goto out;
}
tmp_root->root_key.objectid = BTRFS_FIRST_FREE_OBJECTID;
ret = btrfs_insert_fs_root(root->fs_info, tmp_root);
if (ret) {
test_err("couldn't insert fs root %d", ret);
goto out;
}
btrfs_put_root(tmp_root);
test_msg("running qgroup tests");
ret = test_no_shared_qgroup(root, sectorsize, nodesize);
if (ret)
goto out;
ret = test_multiple_refs(root, sectorsize, nodesize);
out:
btrfs_free_dummy_root(root);
btrfs_free_dummy_fs_info(fs_info);
return ret;
}
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