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(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(0, 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 }