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

   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
  12 static int test_btrfs_split_item(u32 sectorsize, u32 nodesize)
  13 {
  14         struct btrfs_fs_info *fs_info;
  15         struct btrfs_path *path = NULL;
  16         struct btrfs_root *root = NULL;
  17         struct extent_buffer *eb;
  18         struct btrfs_item *item;
  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         path->nodes[0] = eb = alloc_dummy_extent_buffer(fs_info, nodesize);
  52         if (!eb) {
  53                 test_std_err(TEST_ALLOC_EXTENT_BUFFER);
  54                 ret = -ENOMEM;
  55                 goto out;
  56         }
  57         path->slots[0] = 0;
  58
  59         key.objectid = 0;
  60         key.type = BTRFS_EXTENT_CSUM_KEY;
  61         key.offset = 0;
  62
  63         setup_items_for_insert(root, path, &key, &value_len, 1);
  64         item = btrfs_item_nr(0);
  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         item = btrfs_item_nr(0);
  94         if (btrfs_item_size(eb, item) != strlen(split1)) {
  95                 test_err("invalid len in the first split");
  96                 ret = -EINVAL;
  97                 goto out;
  98         }
  99
 100         read_extent_buffer(eb, buf, btrfs_item_ptr_offset(eb, 0),
 101                            strlen(split1));
 102         if (memcmp(buf, split1, strlen(split1))) {
 103                 test_err(
 104 "data in the buffer doesn't match what it should in the first split have='%.*s' want '%s'",
 105                          (int)strlen(split1), buf, split1);
 106                 ret = -EINVAL;
 107                 goto out;
 108         }
 109
 110         btrfs_item_key_to_cpu(eb, &key, 1);
 111         if (key.objectid != 0 || key.type != BTRFS_EXTENT_CSUM_KEY ||
 112             key.offset != 3) {
 113                 test_err("invalid key at slot 1");
 114                 ret = -EINVAL;
 115                 goto out;
 116         }
 117
 118         item = btrfs_item_nr(1);
 119         if (btrfs_item_size(eb, item) != strlen(split2)) {
 120                 test_err("invalid len in the second split");
 121                 ret = -EINVAL;
 122                 goto out;
 123         }
 124
 125         read_extent_buffer(eb, buf, btrfs_item_ptr_offset(eb, 1),
 126                            strlen(split2));
 127         if (memcmp(buf, split2, strlen(split2))) {
 128                 test_err(
 129         "data in the buffer doesn't match what it should in the second split");
 130                 ret = -EINVAL;
 131                 goto out;
 132         }
 133
 134         key.offset = 1;
 135         /* Do it again so we test memmoving the other items in the leaf */
 136         ret = btrfs_split_item(NULL, root, path, &key, 4);
 137         if (ret) {
 138                 test_err("second split item failed %d", ret);
 139                 goto out;
 140         }
 141
 142         btrfs_item_key_to_cpu(eb, &key, 0);
 143         if (key.objectid != 0 || key.type != BTRFS_EXTENT_CSUM_KEY ||
 144             key.offset != 0) {
 145                 test_err("invalid key at slot 0");
 146                 ret = -EINVAL;
 147                 goto out;
 148         }
 149
 150         item = btrfs_item_nr(0);
 151         if (btrfs_item_size(eb, item) != strlen(split3)) {
 152                 test_err("invalid len in the first split");
 153                 ret = -EINVAL;
 154                 goto out;
 155         }
 156
 157         read_extent_buffer(eb, buf, btrfs_item_ptr_offset(eb, 0),
 158                            strlen(split3));
 159         if (memcmp(buf, split3, strlen(split3))) {
 160                 test_err(
 161         "data in the buffer doesn't match what it should in the third split");
 162                 ret = -EINVAL;
 163                 goto out;
 164         }
 165
 166         btrfs_item_key_to_cpu(eb, &key, 1);
 167         if (key.objectid != 0 || key.type != BTRFS_EXTENT_CSUM_KEY ||
 168             key.offset != 1) {
 169                 test_err("invalid key at slot 1");
 170                 ret = -EINVAL;
 171                 goto out;
 172         }
 173
 174         item = btrfs_item_nr(1);
 175         if (btrfs_item_size(eb, item) != strlen(split4)) {
 176                 test_err("invalid len in the second split");
 177                 ret = -EINVAL;
 178                 goto out;
 179         }
 180
 181         read_extent_buffer(eb, buf, btrfs_item_ptr_offset(eb, 1),
 182                            strlen(split4));
 183         if (memcmp(buf, split4, strlen(split4))) {
 184                 test_err(
 185         "data in the buffer doesn't match what it should in the fourth split");
 186                 ret = -EINVAL;
 187                 goto out;
 188         }
 189
 190         btrfs_item_key_to_cpu(eb, &key, 2);
 191         if (key.objectid != 0 || key.type != BTRFS_EXTENT_CSUM_KEY ||
 192             key.offset != 3) {
 193                 test_err("invalid key at slot 2");
 194                 ret = -EINVAL;
 195                 goto out;
 196         }
 197
 198         item = btrfs_item_nr(2);
 199         if (btrfs_item_size(eb, item) != strlen(split2)) {
 200                 test_err("invalid len in the second split");
 201                 ret = -EINVAL;
 202                 goto out;
 203         }
 204
 205         read_extent_buffer(eb, buf, btrfs_item_ptr_offset(eb, 2),
 206                            strlen(split2));
 207         if (memcmp(buf, split2, strlen(split2))) {
 208                 test_err(
 209         "data in the buffer doesn't match what it should in the last chunk");
 210                 ret = -EINVAL;
 211                 goto out;
 212         }
 213 out:
 214         btrfs_free_path(path);
 215         btrfs_free_dummy_root(root);
 216         btrfs_free_dummy_fs_info(fs_info);
 217         return ret;
 218 }
 219
 220 int btrfs_test_extent_buffer_operations(u32 sectorsize, u32 nodesize)
 221 {
 222         test_msg("running extent buffer operation tests");
 223         return test_btrfs_split_item(sectorsize, nodesize);
 224 }