1 /* 2 * Copyright (C) 2013 Fusion IO. All rights reserved. 3 * 4 * This program is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU General Public 6 * License v2 as published by the Free Software Foundation. 7 * 8 * This program is distributed in the hope that it will be useful, 9 * but WITHOUT ANY WARRANTY; without even the implied warranty of 10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 11 * General Public License for more details. 12 * 13 * You should have received a copy of the GNU General Public 14 * License along with this program; if not, write to the 15 * Free Software Foundation, Inc., 59 Temple Place - Suite 330, 16 * Boston, MA 021110-1307, USA. 17 */ 18 19 #include <linux/slab.h> 20 #include "btrfs-tests.h" 21 #include "../ctree.h" 22 #include "../extent_io.h" 23 #include "../disk-io.h" 24 25 static int test_btrfs_split_item(void) 26 { 27 struct btrfs_path *path; 28 struct btrfs_root *root; 29 struct extent_buffer *eb; 30 struct btrfs_item *item; 31 char *value = "mary had a little lamb"; 32 char *split1 = "mary had a little"; 33 char *split2 = " lamb"; 34 char *split3 = "mary"; 35 char *split4 = " had a little"; 36 char buf[32]; 37 struct btrfs_key key; 38 u32 value_len = strlen(value); 39 int ret = 0; 40 41 test_msg("Running btrfs_split_item tests\n"); 42 43 root = btrfs_alloc_dummy_root(); 44 if (IS_ERR(root)) { 45 test_msg("Could not allocate root\n"); 46 return PTR_ERR(root); 47 } 48 49 path = btrfs_alloc_path(); 50 if (!path) { 51 test_msg("Could not allocate path\n"); 52 kfree(root); 53 return -ENOMEM; 54 } 55 56 path->nodes[0] = eb = alloc_dummy_extent_buffer(NULL, 4096); 57 if (!eb) { 58 test_msg("Could not allocate dummy buffer\n"); 59 ret = -ENOMEM; 60 goto out; 61 } 62 path->slots[0] = 0; 63 64 key.objectid = 0; 65 key.type = BTRFS_EXTENT_CSUM_KEY; 66 key.offset = 0; 67 68 setup_items_for_insert(root, path, &key, &value_len, value_len, 69 value_len + sizeof(struct btrfs_item), 1); 70 item = btrfs_item_nr(0); 71 write_extent_buffer(eb, value, btrfs_item_ptr_offset(eb, 0), 72 value_len); 73 74 key.offset = 3; 75 76 /* 77 * Passing NULL trans here should be safe because we have plenty of 78 * space in this leaf to split the item without having to split the 79 * leaf. 80 */ 81 ret = btrfs_split_item(NULL, root, path, &key, 17); 82 if (ret) { 83 test_msg("Split item failed %d\n", ret); 84 goto out; 85 } 86 87 /* 88 * Read the first slot, it should have the original key and contain only 89 * 'mary had a little' 90 */ 91 btrfs_item_key_to_cpu(eb, &key, 0); 92 if (key.objectid != 0 || key.type != BTRFS_EXTENT_CSUM_KEY || 93 key.offset != 0) { 94 test_msg("Invalid key at slot 0\n"); 95 ret = -EINVAL; 96 goto out; 97 } 98 99 item = btrfs_item_nr(0); 100 if (btrfs_item_size(eb, item) != strlen(split1)) { 101 test_msg("Invalid len in the first split\n"); 102 ret = -EINVAL; 103 goto out; 104 } 105 106 read_extent_buffer(eb, buf, btrfs_item_ptr_offset(eb, 0), 107 strlen(split1)); 108 if (memcmp(buf, split1, strlen(split1))) { 109 test_msg("Data in the buffer doesn't match what it should " 110 "in the first split have='%.*s' want '%s'\n", 111 (int)strlen(split1), buf, split1); 112 ret = -EINVAL; 113 goto out; 114 } 115 116 btrfs_item_key_to_cpu(eb, &key, 1); 117 if (key.objectid != 0 || key.type != BTRFS_EXTENT_CSUM_KEY || 118 key.offset != 3) { 119 test_msg("Invalid key at slot 1\n"); 120 ret = -EINVAL; 121 goto out; 122 } 123 124 item = btrfs_item_nr(1); 125 if (btrfs_item_size(eb, item) != strlen(split2)) { 126 test_msg("Invalid len in the second split\n"); 127 ret = -EINVAL; 128 goto out; 129 } 130 131 read_extent_buffer(eb, buf, btrfs_item_ptr_offset(eb, 1), 132 strlen(split2)); 133 if (memcmp(buf, split2, strlen(split2))) { 134 test_msg("Data in the buffer doesn't match what it should " 135 "in the second split\n"); 136 ret = -EINVAL; 137 goto out; 138 } 139 140 key.offset = 1; 141 /* Do it again so we test memmoving the other items in the leaf */ 142 ret = btrfs_split_item(NULL, root, path, &key, 4); 143 if (ret) { 144 test_msg("Second split item failed %d\n", ret); 145 goto out; 146 } 147 148 btrfs_item_key_to_cpu(eb, &key, 0); 149 if (key.objectid != 0 || key.type != BTRFS_EXTENT_CSUM_KEY || 150 key.offset != 0) { 151 test_msg("Invalid key at slot 0\n"); 152 ret = -EINVAL; 153 goto out; 154 } 155 156 item = btrfs_item_nr(0); 157 if (btrfs_item_size(eb, item) != strlen(split3)) { 158 test_msg("Invalid len in the first split\n"); 159 ret = -EINVAL; 160 goto out; 161 } 162 163 read_extent_buffer(eb, buf, btrfs_item_ptr_offset(eb, 0), 164 strlen(split3)); 165 if (memcmp(buf, split3, strlen(split3))) { 166 test_msg("Data in the buffer doesn't match what it should " 167 "in the third split"); 168 ret = -EINVAL; 169 goto out; 170 } 171 172 btrfs_item_key_to_cpu(eb, &key, 1); 173 if (key.objectid != 0 || key.type != BTRFS_EXTENT_CSUM_KEY || 174 key.offset != 1) { 175 test_msg("Invalid key at slot 1\n"); 176 ret = -EINVAL; 177 goto out; 178 } 179 180 item = btrfs_item_nr(1); 181 if (btrfs_item_size(eb, item) != strlen(split4)) { 182 test_msg("Invalid len in the second split\n"); 183 ret = -EINVAL; 184 goto out; 185 } 186 187 read_extent_buffer(eb, buf, btrfs_item_ptr_offset(eb, 1), 188 strlen(split4)); 189 if (memcmp(buf, split4, strlen(split4))) { 190 test_msg("Data in the buffer doesn't match what it should " 191 "in the fourth split\n"); 192 ret = -EINVAL; 193 goto out; 194 } 195 196 btrfs_item_key_to_cpu(eb, &key, 2); 197 if (key.objectid != 0 || key.type != BTRFS_EXTENT_CSUM_KEY || 198 key.offset != 3) { 199 test_msg("Invalid key at slot 2\n"); 200 ret = -EINVAL; 201 goto out; 202 } 203 204 item = btrfs_item_nr(2); 205 if (btrfs_item_size(eb, item) != strlen(split2)) { 206 test_msg("Invalid len in the second split\n"); 207 ret = -EINVAL; 208 goto out; 209 } 210 211 read_extent_buffer(eb, buf, btrfs_item_ptr_offset(eb, 2), 212 strlen(split2)); 213 if (memcmp(buf, split2, strlen(split2))) { 214 test_msg("Data in the buffer doesn't match what it should " 215 "in the last chunk\n"); 216 ret = -EINVAL; 217 goto out; 218 } 219 out: 220 btrfs_free_path(path); 221 kfree(root); 222 return ret; 223 } 224 225 int btrfs_test_extent_buffer_operations(void) 226 { 227 test_msg("Running extent buffer operation tests"); 228 return test_btrfs_split_item(); 229 } 230