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, value_len,
  64                                value_len + sizeof(struct btrfs_item), 1);
  65         item = btrfs_item_nr(0);
  66         write_extent_buffer(eb, value, btrfs_item_ptr_offset(eb, 0),
  67                             value_len);
  68
  69         key.offset = 3;
  70
  71         /*
  72          * Passing NULL trans here should be safe because we have plenty of
  73          * space in this leaf to split the item without having to split the
  74          * leaf.
  75          */
  76         ret = btrfs_split_item(NULL, root, path, &key, 17);
  77         if (ret) {
  78                 test_err("split item failed %d", ret);
  79                 goto out;
  80         }
  81
  82         /*
  83          * Read the first slot, it should have the original key and contain only
  84          * 'mary had a little'
  85          */
  86         btrfs_item_key_to_cpu(eb, &key, 0);
  87         if (key.objectid != 0 || key.type != BTRFS_EXTENT_CSUM_KEY ||
  88             key.offset != 0) {
  89                 test_err("invalid key at slot 0");
  90                 ret = -EINVAL;
  91                 goto out;
  92         }
  93
  94         item = btrfs_item_nr(0);
  95         if (btrfs_item_size(eb, item) != strlen(split1)) {
  96                 test_err("invalid len in the first split");
  97                 ret = -EINVAL;
  98                 goto out;
  99         }
 100
 101         read_extent_buffer(eb, buf, btrfs_item_ptr_offset(eb, 0),
 102                            strlen(split1));
 103         if (memcmp(buf, split1, strlen(split1))) {
 104                 test_err(
 105 "data in the buffer doesn't match what it should in the first split have='%.*s' want '%s'",
 106                          (int)strlen(split1), buf, split1);
 107                 ret = -EINVAL;
 108                 goto out;
 109         }
 110
 111         btrfs_item_key_to_cpu(eb, &key, 1);
 112         if (key.objectid != 0 || key.type != BTRFS_EXTENT_CSUM_KEY ||
 113             key.offset != 3) {
 114                 test_err("invalid key at slot 1");
 115                 ret = -EINVAL;
 116                 goto out;
 117         }
 118
 119         item = btrfs_item_nr(1);
 120         if (btrfs_item_size(eb, item) != strlen(split2)) {
 121                 test_err("invalid len in the second split");
 122                 ret = -EINVAL;
 123                 goto out;
 124         }
 125
 126         read_extent_buffer(eb, buf, btrfs_item_ptr_offset(eb, 1),
 127                            strlen(split2));
 128         if (memcmp(buf, split2, strlen(split2))) {
 129                 test_err(
 130         "data in the buffer doesn't match what it should in the second split");
 131                 ret = -EINVAL;
 132                 goto out;
 133         }
 134
 135         key.offset = 1;
 136         /* Do it again so we test memmoving the other items in the leaf */
 137         ret = btrfs_split_item(NULL, root, path, &key, 4);
 138         if (ret) {
 139                 test_err("second split item failed %d", ret);
 140                 goto out;
 141         }
 142
 143         btrfs_item_key_to_cpu(eb, &key, 0);
 144         if (key.objectid != 0 || key.type != BTRFS_EXTENT_CSUM_KEY ||
 145             key.offset != 0) {
 146                 test_err("invalid key at slot 0");
 147                 ret = -EINVAL;
 148                 goto out;
 149         }
 150
 151         item = btrfs_item_nr(0);
 152         if (btrfs_item_size(eb, item) != 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         item = btrfs_item_nr(1);
 176         if (btrfs_item_size(eb, item) != strlen(split4)) {
 177                 test_err("invalid len in the second split");
 178                 ret = -EINVAL;
 179                 goto out;
 180         }
 181
 182         read_extent_buffer(eb, buf, btrfs_item_ptr_offset(eb, 1),
 183                            strlen(split4));
 184         if (memcmp(buf, split4, strlen(split4))) {
 185                 test_err(
 186         "data in the buffer doesn't match what it should in the fourth split");
 187                 ret = -EINVAL;
 188                 goto out;
 189         }
 190
 191         btrfs_item_key_to_cpu(eb, &key, 2);
 192         if (key.objectid != 0 || key.type != BTRFS_EXTENT_CSUM_KEY ||
 193             key.offset != 3) {
 194                 test_err("invalid key at slot 2");
 195                 ret = -EINVAL;
 196                 goto out;
 197         }
 198
 199         item = btrfs_item_nr(2);
 200         if (btrfs_item_size(eb, item) != strlen(split2)) {
 201                 test_err("invalid len in the second split");
 202                 ret = -EINVAL;
 203                 goto out;
 204         }
 205
 206         read_extent_buffer(eb, buf, btrfs_item_ptr_offset(eb, 2),
 207                            strlen(split2));
 208         if (memcmp(buf, split2, strlen(split2))) {
 209                 test_err(
 210         "data in the buffer doesn't match what it should in the last chunk");
 211                 ret = -EINVAL;
 212                 goto out;
 213         }
 214 out:
 215         btrfs_free_path(path);
 216         btrfs_free_dummy_root(root);
 217         btrfs_free_dummy_fs_info(fs_info);
 218         return ret;
 219 }
 220
 221 int btrfs_test_extent_buffer_operations(u32 sectorsize, u32 nodesize)
 222 {
 223         test_msg("running extent buffer operation tests");
 224         return test_btrfs_split_item(sectorsize, nodesize);
 225 }