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

   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(u32 sectorsize, u32 nodesize)
  26 {
  27         struct btrfs_fs_info *fs_info;
  28         struct btrfs_path *path = NULL;
  29         struct btrfs_root *root = NULL;
  30         struct extent_buffer *eb;
  31         struct btrfs_item *item;
  32         char *value = "mary had a little lamb";
  33         char *split1 = "mary had a little";
  34         char *split2 = " lamb";
  35         char *split3 = "mary";
  36         char *split4 = " had a little";
  37         char buf[32];
  38         struct btrfs_key key;
  39         u32 value_len = strlen(value);
  40         int ret = 0;
  41
  42         test_msg("Running btrfs_split_item tests\n");
  43
  44         fs_info = btrfs_alloc_dummy_fs_info(nodesize, sectorsize);
  45         if (!fs_info) {
  46                 test_msg("Could not allocate fs_info\n");
  47                 return -ENOMEM;
  48         }
  49
  50         root = btrfs_alloc_dummy_root(fs_info);
  51         if (IS_ERR(root)) {
  52                 test_msg("Could not allocate root\n");
  53                 ret = PTR_ERR(root);
  54                 goto out;
  55         }
  56
  57         path = btrfs_alloc_path();
  58         if (!path) {
  59                 test_msg("Could not allocate path\n");
  60                 ret = -ENOMEM;
  61                 goto out;
  62         }
  63
  64         path->nodes[0] = eb = alloc_dummy_extent_buffer(fs_info, nodesize);
  65         if (!eb) {
  66                 test_msg("Could not allocate dummy buffer\n");
  67                 ret = -ENOMEM;
  68                 goto out;
  69         }
  70         path->slots[0] = 0;
  71
  72         key.objectid = 0;
  73         key.type = BTRFS_EXTENT_CSUM_KEY;
  74         key.offset = 0;
  75
  76         setup_items_for_insert(root, path, &key, &value_len, value_len,
  77                                value_len + sizeof(struct btrfs_item), 1);
  78         item = btrfs_item_nr(0);
  79         write_extent_buffer(eb, value, btrfs_item_ptr_offset(eb, 0),
  80                             value_len);
  81
  82         key.offset = 3;
  83
  84         /*
  85          * Passing NULL trans here should be safe because we have plenty of
  86          * space in this leaf to split the item without having to split the
  87          * leaf.
  88          */
  89         ret = btrfs_split_item(NULL, root, path, &key, 17);
  90         if (ret) {
  91                 test_msg("Split item failed %d\n", ret);
  92                 goto out;
  93         }
  94
  95         /*
  96          * Read the first slot, it should have the original key and contain only
  97          * 'mary had a little'
  98          */
  99         btrfs_item_key_to_cpu(eb, &key, 0);
 100         if (key.objectid != 0 || key.type != BTRFS_EXTENT_CSUM_KEY ||
 101             key.offset != 0) {
 102                 test_msg("Invalid key at slot 0\n");
 103                 ret = -EINVAL;
 104                 goto out;
 105         }
 106
 107         item = btrfs_item_nr(0);
 108         if (btrfs_item_size(eb, item) != strlen(split1)) {
 109                 test_msg("Invalid len in the first split\n");
 110                 ret = -EINVAL;
 111                 goto out;
 112         }
 113
 114         read_extent_buffer(eb, buf, btrfs_item_ptr_offset(eb, 0),
 115                            strlen(split1));
 116         if (memcmp(buf, split1, strlen(split1))) {
 117                 test_msg("Data in the buffer doesn't match what it should "
 118                          "in the first split have='%.*s' want '%s'\n",
 119                          (int)strlen(split1), buf, split1);
 120                 ret = -EINVAL;
 121                 goto out;
 122         }
 123
 124         btrfs_item_key_to_cpu(eb, &key, 1);
 125         if (key.objectid != 0 || key.type != BTRFS_EXTENT_CSUM_KEY ||
 126             key.offset != 3) {
 127                 test_msg("Invalid key at slot 1\n");
 128                 ret = -EINVAL;
 129                 goto out;
 130         }
 131
 132         item = btrfs_item_nr(1);
 133         if (btrfs_item_size(eb, item) != strlen(split2)) {
 134                 test_msg("Invalid len in the second split\n");
 135                 ret = -EINVAL;
 136                 goto out;
 137         }
 138
 139         read_extent_buffer(eb, buf, btrfs_item_ptr_offset(eb, 1),
 140                            strlen(split2));
 141         if (memcmp(buf, split2, strlen(split2))) {
 142                 test_msg("Data in the buffer doesn't match what it should "
 143                          "in the second split\n");
 144                 ret = -EINVAL;
 145                 goto out;
 146         }
 147
 148         key.offset = 1;
 149         /* Do it again so we test memmoving the other items in the leaf */
 150         ret = btrfs_split_item(NULL, root, path, &key, 4);
 151         if (ret) {
 152                 test_msg("Second split item failed %d\n", ret);
 153                 goto out;
 154         }
 155
 156         btrfs_item_key_to_cpu(eb, &key, 0);
 157         if (key.objectid != 0 || key.type != BTRFS_EXTENT_CSUM_KEY ||
 158             key.offset != 0) {
 159                 test_msg("Invalid key at slot 0\n");
 160                 ret = -EINVAL;
 161                 goto out;
 162         }
 163
 164         item = btrfs_item_nr(0);
 165         if (btrfs_item_size(eb, item) != strlen(split3)) {
 166                 test_msg("Invalid len in the first split\n");
 167                 ret = -EINVAL;
 168                 goto out;
 169         }
 170
 171         read_extent_buffer(eb, buf, btrfs_item_ptr_offset(eb, 0),
 172                            strlen(split3));
 173         if (memcmp(buf, split3, strlen(split3))) {
 174                 test_msg("Data in the buffer doesn't match what it should "
 175                          "in the third split");
 176                 ret = -EINVAL;
 177                 goto out;
 178         }
 179
 180         btrfs_item_key_to_cpu(eb, &key, 1);
 181         if (key.objectid != 0 || key.type != BTRFS_EXTENT_CSUM_KEY ||
 182             key.offset != 1) {
 183                 test_msg("Invalid key at slot 1\n");
 184                 ret = -EINVAL;
 185                 goto out;
 186         }
 187
 188         item = btrfs_item_nr(1);
 189         if (btrfs_item_size(eb, item) != strlen(split4)) {
 190                 test_msg("Invalid len in the second split\n");
 191                 ret = -EINVAL;
 192                 goto out;
 193         }
 194
 195         read_extent_buffer(eb, buf, btrfs_item_ptr_offset(eb, 1),
 196                            strlen(split4));
 197         if (memcmp(buf, split4, strlen(split4))) {
 198                 test_msg("Data in the buffer doesn't match what it should "
 199                          "in the fourth split\n");
 200                 ret = -EINVAL;
 201                 goto out;
 202         }
 203
 204         btrfs_item_key_to_cpu(eb, &key, 2);
 205         if (key.objectid != 0 || key.type != BTRFS_EXTENT_CSUM_KEY ||
 206             key.offset != 3) {
 207                 test_msg("Invalid key at slot 2\n");
 208                 ret = -EINVAL;
 209                 goto out;
 210         }
 211
 212         item = btrfs_item_nr(2);
 213         if (btrfs_item_size(eb, item) != strlen(split2)) {
 214                 test_msg("Invalid len in the second split\n");
 215                 ret = -EINVAL;
 216                 goto out;
 217         }
 218
 219         read_extent_buffer(eb, buf, btrfs_item_ptr_offset(eb, 2),
 220                            strlen(split2));
 221         if (memcmp(buf, split2, strlen(split2))) {
 222                 test_msg("Data in the buffer doesn't match what it should "
 223                          "in the last chunk\n");
 224                 ret = -EINVAL;
 225                 goto out;
 226         }
 227 out:
 228         btrfs_free_path(path);
 229         btrfs_free_dummy_root(root);
 230         btrfs_free_dummy_fs_info(fs_info);
 231         return ret;
 232 }
 233
 234 int btrfs_test_extent_buffer_operations(u32 sectorsize, u32 nodesize)
 235 {
 236         test_msg("Running extent buffer operation tests\n");
 237         return test_btrfs_split_item(sectorsize, nodesize);
 238 }