versions/v1_4_0/mynewt-core/fs/nffs/test/src/testcases/corrupt_block_test.c

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 * 
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

#include "nffs_test_utils.h"

TEST_CASE(nffs_test_corrupt_block)
{
    struct nffs_block block;
    struct fs_file *fs_file;
    struct nffs_file *file;
    uint32_t flash_offset;
    uint32_t area_offset;
    uint8_t area_idx;
    uint8_t off;    /* offset to corrupt */
    int rc;
    struct nffs_disk_block ndb;

    /*** Setup. */
    rc = nffs_format(nffs_current_area_descs);
    TEST_ASSERT(rc == 0);

    rc = fs_mkdir("/mydir");
    TEST_ASSERT(rc == 0);

    nffs_test_util_create_file("/mydir/a", "aaaa", 4);
    nffs_test_util_create_file("/mydir/b", "bbbb", 4);
    nffs_test_util_create_file("/mydir/c", "cccc", 4);

    /* Add a second block to the 'b' file. */
    nffs_test_util_append_file("/mydir/b", "1234", 4);

    /* Corrupt the 'b' file; overwrite the second block's magic number. */
    rc = fs_open("/mydir/b", FS_ACCESS_READ, &fs_file);
    TEST_ASSERT(rc == 0);
    file = (struct nffs_file *)fs_file;

    rc = nffs_block_from_hash_entry(&block,
                                   file->nf_inode_entry->nie_last_block_entry);
    TEST_ASSERT(rc == 0);

    nffs_flash_loc_expand(block.nb_hash_entry->nhe_flash_loc, &area_idx,
                         &area_offset);
    flash_offset = nffs_areas[area_idx].na_offset + area_offset;

    /*
     * Overwriting the reserved16 field should invalidate the CRC
     */
    off = (char*)&ndb.reserved16 - (char*)&ndb;
    rc = flash_native_memset(flash_offset + off, 0x43, 1);

    TEST_ASSERT(rc == 0);

    /* Write a fourth file. This file should get restored even though the
     * previous object has an invalid magic number.
     */
    nffs_test_util_create_file("/mydir/d", "dddd", 4);

    rc = nffs_misc_reset();
    TEST_ASSERT(rc == 0);
    rc = nffs_detect(nffs_current_area_descs);
    TEST_ASSERT(rc == 0);

    /* The entire second block should be removed; the file should only contain
     * the first block.
     */
    struct nffs_test_file_desc *expected_system =
        (struct nffs_test_file_desc[]) { {
            .filename = "",
            .is_dir = 1,
            .children = (struct nffs_test_file_desc[]) { {
                .filename = "mydir",
                .is_dir = 1,
                .children = (struct nffs_test_file_desc[]) { {
                    .filename = "a",
                    .contents = "aaaa",
                    .contents_len = 4,
#if 0
                /*
                 * In the newer implementation without the find_file_ends
                 * corrupted inodes are deleted rather than retained with
                 * partial contents
                 */
                }, {
                    .filename = "b",
                    .contents = "bbbb",
                    .contents_len = 4,
#endif
                }, {
                    .filename = "c",
                    .contents = "cccc",
                    .contents_len = 4,
                }, {
                    .filename = "d",
                    .contents = "dddd",
                    .contents_len = 4,
                }, {
                    .filename = NULL,
                } },
            }, {
                .filename = NULL,
            } },
    } };

    nffs_test_assert_system(expected_system, nffs_current_area_descs);
}