ref: 53b4f91981f5898473830d53c24c27e17f83a8a1
dir: /include/ext4_journal.h/
/*
* Copyright (c) 2015 Grzegorz Kostka (kostka.grzegorz@gmail.com)
* Copyright (c) 2015 Kaho Ng (ngkaho1234@gmail.com)
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* - The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/** @addtogroup lwext4
* @{
*/
/**
* @file ext4_journal.h
* @brief Journal handle functions
*/
#ifndef EXT4_JOURNAL_H_
#define EXT4_JOURNAL_H_
#ifdef __cplusplus
extern "C" {
#endif
#include "ext4_config.h"
#include "ext4_types.h"
#include "misc/queue.h"
#include "misc/tree.h"
struct jbd_fs {
/* If journal block device is used, bdev will be non-null */
struct ext4_blockdev *bdev;
struct ext4_inode_ref inode_ref;
struct jbd_sb sb;
bool dirty;
};
struct jbd_buf {
uint64_t jbd_lba;
struct ext4_block block;
struct jbd_trans *trans;
struct jbd_block_rec *block_rec;
TAILQ_ENTRY(jbd_buf) buf_node;
TAILQ_ENTRY(jbd_buf) dirty_buf_node;
};
struct jbd_revoke_rec {
ext4_fsblk_t lba;
LIST_ENTRY(jbd_revoke_rec) revoke_node;
};
struct jbd_block_rec {
ext4_fsblk_t lba;
struct ext4_buf *buf;
struct jbd_trans *trans;
RB_ENTRY(jbd_block_rec) block_rec_node;
LIST_ENTRY(jbd_block_rec) tbrec_node;
TAILQ_HEAD(jbd_buf_dirty, jbd_buf) dirty_buf_queue;
};
struct jbd_trans {
uint32_t trans_id;
uint32_t start_iblock;
int alloc_blocks;
int data_cnt;
uint32_t data_csum;
int written_cnt;
int error;
struct jbd_journal *journal;
TAILQ_HEAD(jbd_trans_buf, jbd_buf) buf_queue;
LIST_HEAD(jbd_revoke_list, jbd_revoke_rec) revoke_list;
LIST_HEAD(jbd_trans_block_rec, jbd_block_rec) tbrec_list;
TAILQ_ENTRY(jbd_trans) trans_node;
};
struct jbd_journal {
uint32_t first;
uint32_t start;
uint32_t last;
uint32_t trans_id;
uint32_t alloc_trans_id;
uint32_t block_size;
TAILQ_HEAD(jbd_trans_queue, jbd_trans) trans_queue;
TAILQ_HEAD(jbd_cp_queue, jbd_trans) cp_queue;
RB_HEAD(jbd_block, jbd_block_rec) block_rec_root;
struct jbd_fs *jbd_fs;
};
int jbd_get_fs(struct ext4_fs *fs,
struct jbd_fs *jbd_fs);
int jbd_put_fs(struct jbd_fs *jbd_fs);
int jbd_inode_bmap(struct jbd_fs *jbd_fs,
ext4_lblk_t iblock,
ext4_fsblk_t *fblock);
int jbd_recover(struct jbd_fs *jbd_fs);
int jbd_journal_start(struct jbd_fs *jbd_fs,
struct jbd_journal *journal);
int jbd_journal_stop(struct jbd_journal *journal);
struct jbd_trans *jbd_journal_new_trans(struct jbd_journal *journal);
int jbd_trans_get_access(struct jbd_journal *journal,
struct jbd_trans *trans,
struct ext4_block *block);
int jbd_trans_set_block_dirty(struct jbd_trans *trans,
struct ext4_block *block);
int jbd_trans_revoke_block(struct jbd_trans *trans,
ext4_fsblk_t lba);
int jbd_trans_try_revoke_block(struct jbd_trans *trans,
ext4_fsblk_t lba);
void jbd_journal_free_trans(struct jbd_journal *journal,
struct jbd_trans *trans,
bool abort);
int jbd_journal_commit_trans(struct jbd_journal *journal,
struct jbd_trans *trans);
#ifdef __cplusplus
}
#endif
#endif /* EXT4_JOURNAL_H_ */
/**
* @}
*/