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 #include "../accessors.h"
  12
  13 static 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         /*
  65          * Passing a NULL trans handle is fine here, we have a dummy root eb
  66          * and the tree is a single node (level 0).
  67          */
  68         btrfs_setup_item_for_insert(NULL, root, path, &key, value_len);
  69         write_extent_buffer(eb, value, btrfs_item_ptr_offset(eb, 0),
  70                             value_len);
  71
  72         key.offset = 3;
  73
  74         /*
  75          * Passing NULL trans here should be safe because we have plenty of
  76          * space in this leaf to split the item without having to split the
  77          * leaf.
  78          */
  79         ret = btrfs_split_item(NULL, root, path, &key, 17);
  80         if (ret) {
  81                 test_err("split item failed %d", ret);
  82                 goto out;
  83         }
  84
  85         /*
  86          * Read the first slot, it should have the original key and contain only
  87          * 'mary had a little'
  88          */
  89         btrfs_item_key_to_cpu(eb, &key, 0);
  90         if (key.objectid != 0 || key.type != BTRFS_EXTENT_CSUM_KEY ||
  91             key.offset != 0) {
  92                 test_err("invalid key at slot 0");
  93                 ret = -EINVAL;
  94                 goto out;
  95         }
  96
  97         if (btrfs_item_size(eb, 0) != strlen(split1)) {
  98                 test_err("invalid len in the first split");
  99                 ret = -EINVAL;
 100                 goto out;
 101         }
 102
 103         read_extent_buffer(eb, buf, btrfs_item_ptr_offset(eb, 0),
 104                            strlen(split1));
 105         if (memcmp(buf, split1, strlen(split1))) {
 106                 test_err(
 107 "data in the buffer doesn't match what it should in the first split have='%.*s' want '%s'",
 108                          (int)strlen(split1), buf, split1);
 109                 ret = -EINVAL;
 110                 goto out;
 111         }
 112
 113         btrfs_item_key_to_cpu(eb, &key, 1);
 114         if (key.objectid != 0 || key.type != BTRFS_EXTENT_CSUM_KEY ||
 115             key.offset != 3) {
 116                 test_err("invalid key at slot 1");
 117                 ret = -EINVAL;
 118                 goto out;
 119         }
 120
 121         if (btrfs_item_size(eb, 1) != strlen(split2)) {
 122                 test_err("invalid len in the second split");
 123                 ret = -EINVAL;
 124                 goto out;
 125         }
 126
 127         read_extent_buffer(eb, buf, btrfs_item_ptr_offset(eb, 1),
 128                            strlen(split2));
 129         if (memcmp(buf, split2, strlen(split2))) {
 130                 test_err(
 131         "data in the buffer doesn't match what it should in the second split");
 132                 ret = -EINVAL;
 133                 goto out;
 134         }
 135
 136         key.offset = 1;
 137         /* Do it again so we test memmoving the other items in the leaf */
 138         ret = btrfs_split_item(NULL, root, path, &key, 4);
 139         if (ret) {
 140                 test_err("second split item failed %d", ret);
 141                 goto out;
 142         }
 143
 144         btrfs_item_key_to_cpu(eb, &key, 0);
 145         if (key.objectid != 0 || key.type != BTRFS_EXTENT_CSUM_KEY ||
 146             key.offset != 0) {
 147                 test_err("invalid key at slot 0");
 148                 ret = -EINVAL;
 149                 goto out;
 150         }
 151
 152         if (btrfs_item_size(eb, 0) != strlen(split3)) {
 153                 test_err("invalid len in the first split");
 154                 ret = -EINVAL;
 155                 goto out;
 156         }
 157
 158         read_extent_buffer(eb, buf, btrfs_item_ptr_offset(eb, 0),
 159                            strlen(split3));
 160         if (memcmp(buf, split3, strlen(split3))) {
 161                 test_err(
 162         "data in the buffer doesn't match what it should in the third split");
 163                 ret = -EINVAL;
 164                 goto out;
 165         }
 166
 167         btrfs_item_key_to_cpu(eb, &key, 1);
 168         if (key.objectid != 0 || key.type != BTRFS_EXTENT_CSUM_KEY ||
 169             key.offset != 1) {
 170                 test_err("invalid key at slot 1");
 171                 ret = -EINVAL;
 172                 goto out;
 173         }
 174
 175         if (btrfs_item_size(eb, 1) != 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         if (btrfs_item_size(eb, 2) != strlen(split2)) {
 199                 test_err("invalid len in the second split");
 200                 ret = -EINVAL;
 201                 goto out;
 202         }
 203
 204         read_extent_buffer(eb, buf, btrfs_item_ptr_offset(eb, 2),
 205                            strlen(split2));
 206         if (memcmp(buf, split2, strlen(split2))) {
 207                 test_err(
 208         "data in the buffer doesn't match what it should in the last chunk");
 209                 ret = -EINVAL;
 210                 goto out;
 211         }
 212 out:
 213         btrfs_free_path(path);
 214         btrfs_free_dummy_root(root);
 215         btrfs_free_dummy_fs_info(fs_info);
 216         return ret;
 217 }
 218
 219 int btrfs_test_extent_buffer_operations(u32 sectorsize, u32 nodesize)
 220 {
 221         test_msg("running extent buffer operation tests");
 222         return test_btrfs_split_item(sectorsize, nodesize);
 223 }