1// SPDX-License-Identifier: GPL-2.0
  2/*
  3 * Copyright (C) 2013 Fusion IO.  All rights reserved.
  4 */
  5
  6#include <linux/slab.h>
  7#include "btrfs-tests.h"
  8#include "../ctree.h"
  9#include "../extent_io.h"
 10#include "../disk-io.h"
 11#include "../accessors.h"
 12
 13static int test_btrfs_split_item(u32 sectorsize, u32 nodesize)
 14{
 15	struct btrfs_fs_info *fs_info;
 16	struct btrfs_path *path = NULL;
 17	struct btrfs_root *root = NULL;
 18	struct extent_buffer *eb;
 19	char *value = "mary had a little lamb";
 20	char *split1 = "mary had a little";
 21	char *split2 = " lamb";
 22	char *split3 = "mary";
 23	char *split4 = " had a little";
 24	char buf[32];
 25	struct btrfs_key key;
 26	u32 value_len = strlen(value);
 27	int ret = 0;
 28
 29	test_msg("running btrfs_split_item tests");
 30
 31	fs_info = btrfs_alloc_dummy_fs_info(nodesize, sectorsize);
 32	if (!fs_info) {
 33		test_std_err(TEST_ALLOC_FS_INFO);
 34		return -ENOMEM;
 35	}
 36
 37	root = btrfs_alloc_dummy_root(fs_info);
 38	if (IS_ERR(root)) {
 39		test_std_err(TEST_ALLOC_ROOT);
 40		ret = PTR_ERR(root);
 41		goto out;
 42	}
 43
 44	path = btrfs_alloc_path();
 45	if (!path) {
 46		test_std_err(TEST_ALLOC_PATH);
 47		ret = -ENOMEM;
 48		goto out;
 49	}
 50
 51	eb = alloc_dummy_extent_buffer(fs_info, nodesize);
 52	path->nodes[0] = eb;
 53	if (!eb) {
 54		test_std_err(TEST_ALLOC_EXTENT_BUFFER);
 55		ret = -ENOMEM;
 56		goto out;
 57	}
 58	path->slots[0] = 0;
 59
 60	key.objectid = 0;
 61	key.type = BTRFS_EXTENT_CSUM_KEY;
 62	key.offset = 0;
 63
 64	btrfs_setup_item_for_insert(root, path, &key, value_len);
 65	write_extent_buffer(eb, value, btrfs_item_ptr_offset(eb, 0),
 66			    value_len);
 67
 68	key.offset = 3;
 69
 70	/*
 71	 * Passing NULL trans here should be safe because we have plenty of
 72	 * space in this leaf to split the item without having to split the
 73	 * leaf.
 74	 */
 75	ret = btrfs_split_item(NULL, root, path, &key, 17);
 76	if (ret) {
 77		test_err("split item failed %d", ret);
 78		goto out;
 79	}
 80
 81	/*
 82	 * Read the first slot, it should have the original key and contain only
 83	 * 'mary had a little'
 84	 */
 85	btrfs_item_key_to_cpu(eb, &key, 0);
 86	if (key.objectid != 0 || key.type != BTRFS_EXTENT_CSUM_KEY ||
 87	    key.offset != 0) {
 88		test_err("invalid key at slot 0");
 89		ret = -EINVAL;
 90		goto out;
 91	}
 92
 93	if (btrfs_item_size(eb, 0) != strlen(split1)) {
 94		test_err("invalid len in the first split");
 95		ret = -EINVAL;
 96		goto out;
 97	}
 98
 99	read_extent_buffer(eb, buf, btrfs_item_ptr_offset(eb, 0),
100			   strlen(split1));
101	if (memcmp(buf, split1, strlen(split1))) {
102		test_err(
103"data in the buffer doesn't match what it should in the first split have='%.*s' want '%s'",
104			 (int)strlen(split1), buf, split1);
105		ret = -EINVAL;
106		goto out;
107	}
108
109	btrfs_item_key_to_cpu(eb, &key, 1);
110	if (key.objectid != 0 || key.type != BTRFS_EXTENT_CSUM_KEY ||
111	    key.offset != 3) {
112		test_err("invalid key at slot 1");
113		ret = -EINVAL;
114		goto out;
115	}
116
117	if (btrfs_item_size(eb, 1) != strlen(split2)) {
118		test_err("invalid len in the second split");
119		ret = -EINVAL;
120		goto out;
121	}
122
123	read_extent_buffer(eb, buf, btrfs_item_ptr_offset(eb, 1),
124			   strlen(split2));
125	if (memcmp(buf, split2, strlen(split2))) {
126		test_err(
127	"data in the buffer doesn't match what it should in the second split");
128		ret = -EINVAL;
129		goto out;
130	}
131
132	key.offset = 1;
133	/* Do it again so we test memmoving the other items in the leaf */
134	ret = btrfs_split_item(NULL, root, path, &key, 4);
135	if (ret) {
136		test_err("second split item failed %d", ret);
137		goto out;
138	}
139
140	btrfs_item_key_to_cpu(eb, &key, 0);
141	if (key.objectid != 0 || key.type != BTRFS_EXTENT_CSUM_KEY ||
142	    key.offset != 0) {
143		test_err("invalid key at slot 0");
144		ret = -EINVAL;
145		goto out;
146	}
147
148	if (btrfs_item_size(eb, 0) != strlen(split3)) {
149		test_err("invalid len in the first split");
150		ret = -EINVAL;
151		goto out;
152	}
153
154	read_extent_buffer(eb, buf, btrfs_item_ptr_offset(eb, 0),
155			   strlen(split3));
156	if (memcmp(buf, split3, strlen(split3))) {
157		test_err(
158	"data in the buffer doesn't match what it should in the third split");
159		ret = -EINVAL;
160		goto out;
161	}
162
163	btrfs_item_key_to_cpu(eb, &key, 1);
164	if (key.objectid != 0 || key.type != BTRFS_EXTENT_CSUM_KEY ||
165	    key.offset != 1) {
166		test_err("invalid key at slot 1");
167		ret = -EINVAL;
168		goto out;
169	}
170
171	if (btrfs_item_size(eb, 1) != strlen(split4)) {
172		test_err("invalid len in the second split");
173		ret = -EINVAL;
174		goto out;
175	}
176
177	read_extent_buffer(eb, buf, btrfs_item_ptr_offset(eb, 1),
178			   strlen(split4));
179	if (memcmp(buf, split4, strlen(split4))) {
180		test_err(
181	"data in the buffer doesn't match what it should in the fourth split");
182		ret = -EINVAL;
183		goto out;
184	}
185
186	btrfs_item_key_to_cpu(eb, &key, 2);
187	if (key.objectid != 0 || key.type != BTRFS_EXTENT_CSUM_KEY ||
188	    key.offset != 3) {
189		test_err("invalid key at slot 2");
190		ret = -EINVAL;
191		goto out;
192	}
193
194	if (btrfs_item_size(eb, 2) != strlen(split2)) {
195		test_err("invalid len in the second split");
196		ret = -EINVAL;
197		goto out;
198	}
199
200	read_extent_buffer(eb, buf, btrfs_item_ptr_offset(eb, 2),
201			   strlen(split2));
202	if (memcmp(buf, split2, strlen(split2))) {
203		test_err(
204	"data in the buffer doesn't match what it should in the last chunk");
205		ret = -EINVAL;
206		goto out;
207	}
208out:
209	btrfs_free_path(path);
210	btrfs_free_dummy_root(root);
211	btrfs_free_dummy_fs_info(fs_info);
212	return ret;
213}
214
215int btrfs_test_extent_buffer_operations(u32 sectorsize, u32 nodesize)
216{
217	test_msg("running extent buffer operation tests");
218	return test_btrfs_split_item(sectorsize, nodesize);
219}