132 lines
5.5 KiB
C
132 lines
5.5 KiB
C
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/****************************************************************************
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* fs/mnemofs/mnemofs_journal.c
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* Journal of mnemofs.
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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* Alternatively, the contents of this file may be used under the terms of
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* the BSD-3-Clause license:
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright (c) 2024 Saurav Pal
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the author nor the names of its contributors may
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* be used to endorse or promote products derived from this software
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS "AS IS" AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* In mnemofs, the journal stores the path, depth and the new location of the
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* CTZ file called logs, and also the location of the master block. The first
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* n blocks of the journal store the logs, while the last two blocks contain
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* master nodes, and the blocks are called as master blocks. The two master
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* blocks are identical copies for backup.
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*
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* Due to LRU, and the structure of mnemofs, the first n blocks of the
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* journal get filled up much faster than the master blocks, and move more.
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* There will be certain point where the entire journal (the n+2 blocks)
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* move, but mostly, its the first n blocks that move.
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*
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* The first block starts with an 8 byte magic sequence, a 2 bytes long
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* number denoting number of blocks in the journal, and then follows up
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* with an array containing the block numbers of all blocks in the journal
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* including the first block. Then the logs start.
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*
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* The logs take up size in multiples of pages. There might be unitilzed
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* space at the end of a log.
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*
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* All logs are followed by a byte-long hash of the log.
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <endian.h>
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#include <nuttx/kmalloc.h>
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#include <nuttx/list.h>
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#include <sys/param.h>
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#include "mnemofs.h"
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/****************************************************************************
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* Private Types
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****************************************************************************/
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/****************************************************************************
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* Private Function Prototypes
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****************************************************************************/
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/****************************************************************************
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* Private Data
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****************************************************************************/
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/****************************************************************************
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* Public Data
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****************************************************************************/
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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int mfs_jrnl_init(FAR struct mfs_sb_s * const sb, mfs_t blk)
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{
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/* TODO */
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return OK;
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}
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void mfs_jrnl_free(FAR struct mfs_sb_s * const sb)
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{
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/* TODO */
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}
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int mfs_jrnl_fmt(FAR struct mfs_sb_s * const sb, mfs_t blk1, mfs_t blk2)
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{
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/* TODO */
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return OK;
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}
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