fs/btrfs/tests/extent-buffer-tests.c

Source file repositories/reference/linux-study-clean/fs/btrfs/tests/extent-buffer-tests.c

File Facts

System
Linux kernel
Corpus path
fs/btrfs/tests/extent-buffer-tests.c
Extension
.c
Size
5424 bytes
Lines
224
Domain
Core OS
Bucket
VFS And Filesystem Core
Inferred role
Core OS: implementation source
Status
source implementation candidate

Why This File Exists

Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.

Dependency Surface

Detected Declarations

Annotated Snippet

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

#include <linux/slab.h>
#include "btrfs-tests.h"
#include "../ctree.h"
#include "../extent_io.h"
#include "../disk-io.h"
#include "../accessors.h"

static int test_btrfs_split_item(u32 sectorsize, u32 nodesize)
{
	struct btrfs_fs_info *fs_info;
	struct btrfs_path *path = NULL;
	struct btrfs_root *root = NULL;
	struct extent_buffer *eb;
	char *value = "mary had a little lamb";
	char *split1 = "mary had a little";
	char *split2 = " lamb";
	char *split3 = "mary";
	char *split4 = " had a little";
	char buf[32];
	struct btrfs_key key;
	u32 value_len = strlen(value);
	int ret = 0;

	test_msg("running btrfs_split_item tests");

	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;
	}

	path = btrfs_alloc_path();
	if (!path) {
		test_std_err(TEST_ALLOC_PATH);
		ret = -ENOMEM;
		goto out;
	}

	eb = alloc_dummy_extent_buffer(fs_info, nodesize);
	path->nodes[0] = eb;
	if (!eb) {
		test_std_err(TEST_ALLOC_EXTENT_BUFFER);
		ret = -ENOMEM;
		goto out;
	}
	path->slots[0] = 0;

	key.objectid = 0;
	key.type = BTRFS_EXTENT_CSUM_KEY;
	key.offset = 0;

	/*
	 * Passing a NULL trans handle is fine here, we have a dummy root eb
	 * and the tree is a single node (level 0).
	 */
	btrfs_setup_item_for_insert(NULL, root, path, &key, value_len);
	write_extent_buffer(eb, value, btrfs_item_ptr_offset(eb, 0),
			    value_len);

	key.offset = 3;

	/*
	 * Passing NULL trans here should be safe because we have plenty of
	 * space in this leaf to split the item without having to split the
	 * leaf.
	 */
	ret = btrfs_split_item(NULL, root, path, &key, 17);
	if (ret) {
		test_err("split item failed %d", ret);
		goto out;
	}

	/*
	 * Read the first slot, it should have the original key and contain only
	 * 'mary had a little'
	 */
	btrfs_item_key_to_cpu(eb, &key, 0);
	if (key.objectid != 0 || key.type != BTRFS_EXTENT_CSUM_KEY ||

Annotation

Implementation Notes