linux/fs/nilfs2/mdt.h

/* SPDX-License-Identifier: GPL-2.0+ */
/*
 * 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
 * @inode: holder of page caches used in shadow mapping
 * @frozen_buffers: list of frozen buffers
 */
struct nilfs_shadow_map { … };

/**
 * 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 { … };

static inline struct nilfs_mdt_info *NILFS_MDT(const struct inode *inode)
{ … }

static inline int nilfs_is_metadata_file_inode(const struct inode *inode)
{ … }

/* Default GFP flags using highmem */
#define NILFS_MDT_GFP …

int nilfs_mdt_get_block(struct inode *, unsigned long, int,
			void (*init_block)(struct inode *,
					   struct buffer_head *, void *),
			struct buffer_head **);
int nilfs_mdt_find_block(struct inode *inode, unsigned long start,
			 unsigned long end, unsigned long *blkoff,
			 struct buffer_head **out_bh);
int nilfs_mdt_delete_block(struct inode *, unsigned long);
int nilfs_mdt_forget_block(struct inode *, unsigned long);
int nilfs_mdt_fetch_dirty(struct inode *);

int nilfs_mdt_init(struct inode *inode, gfp_t gfp_mask, size_t objsz);
void nilfs_mdt_clear(struct inode *inode);
void nilfs_mdt_destroy(struct inode *inode);

void nilfs_mdt_set_entry_size(struct inode *, unsigned int, unsigned int);

int nilfs_mdt_setup_shadow_map(struct inode *inode,
			       struct nilfs_shadow_map *shadow);
int nilfs_mdt_save_to_shadow_map(struct inode *inode);
void nilfs_mdt_restore_from_shadow_map(struct inode *inode);
void nilfs_mdt_clear_shadow_map(struct inode *inode);
int nilfs_mdt_freeze_buffer(struct inode *inode, struct buffer_head *bh);
struct buffer_head *nilfs_mdt_get_frozen_buffer(struct inode *inode,
						struct buffer_head *bh);

static inline void nilfs_mdt_mark_dirty(struct inode *inode)
{ … }

static inline void nilfs_mdt_clear_dirty(struct inode *inode)
{ … }

static inline __u64 nilfs_mdt_cno(struct inode *inode)
{ … }

static inline spinlock_t *
nilfs_mdt_bgl_lock(struct inode *inode, unsigned int block_group)
{ … }

#endif /* _NILFS_MDT_H */