linux-imx

/* SPDX-License-Identifier: GPL-2.0+ */

/*

 * mdt.h - NILFS meta data file prototype and definitions

 *

 * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.

 *

 * Written by Ryusuke Konishi.

 */

​

#ifndef _NILFS_MDT_H

#define _NILFS_MDT_H

​

#include <linux/buffer_head.h>

#include <linux/blockgroup_lock.h>

#include "nilfs.h"

#include "page.h"

​

/**

 * struct nilfs_shadow_map - shadow mapping of meta data file

 * @bmap_store: shadow copy of bmap state

 * @frozen_data: shadowed dirty data pages

 * @frozen_btnodes: shadowed dirty b-tree nodes' pages

 * @frozen_buffers: list of frozen buffers

 */

struct nilfs_shadow_map {

    struct nilfs_bmap_store bmap_store;

    struct address_space frozen_data;

    struct address_space frozen_btnodes;

    struct list_head frozen_buffers;

};

​

/**

 * struct nilfs_mdt_info - on-memory private data of meta data files

 * @mi_sem: reader/writer semaphore for meta data operations

 * @mi_bgl: per-blockgroup locking

 * @mi_entry_size: size of an entry

 * @mi_first_entry_offset: offset to the first entry

 * @mi_entries_per_block: number of entries in a block

 * @mi_palloc_cache: persistent object allocator cache

 * @mi_shadow: shadow of bmap and page caches

 * @mi_blocks_per_group: number of blocks in a group

 * @mi_blocks_per_desc_block: number of blocks per descriptor block

 */

struct nilfs_mdt_info {

    struct rw_semaphore mi_sem;

    struct blockgroup_lock *mi_bgl;

    unsigned int        mi_entry_size;

    unsigned int        mi_first_entry_offset;

    unsigned long       mi_entries_per_block;

    struct nilfs_palloc_cache *mi_palloc_cache;

    struct nilfs_shadow_map *mi_shadow;

    unsigned long       mi_blocks_per_group;

    unsigned long       mi_blocks_per_desc_block;

};

​

static inline struct nilfs_mdt_info *NILFS_MDT(const struct inode *inode)

{

    return inode->i_private;

}

​

static inline int nilfs_is_metadata_file_inode(const struct inode *inode)

{

    return inode->i_private != NULL;