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1/* SPDX-License-Identifier: GPL-2.0+ */2/*3 * NILFS meta data file prototype and definitions4 *5 * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.6 *7 * Written by Ryusuke Konishi.8 */9 10#ifndef _NILFS_MDT_H11#define _NILFS_MDT_H12 13#include <linux/buffer_head.h>14#include <linux/blockgroup_lock.h>15#include "nilfs.h"16#include "page.h"17 18/**19 * struct nilfs_shadow_map - shadow mapping of meta data file20 * @bmap_store: shadow copy of bmap state21 * @inode: holder of page caches used in shadow mapping22 * @frozen_buffers: list of frozen buffers23 */24struct nilfs_shadow_map {25 struct nilfs_bmap_store bmap_store;26 struct inode *inode;27 struct list_head frozen_buffers;28};29 30/**31 * struct nilfs_mdt_info - on-memory private data of meta data files32 * @mi_sem: reader/writer semaphore for meta data operations33 * @mi_bgl: per-blockgroup locking34 * @mi_entry_size: size of an entry35 * @mi_first_entry_offset: offset to the first entry36 * @mi_entries_per_block: number of entries in a block37 * @mi_palloc_cache: persistent object allocator cache38 * @mi_shadow: shadow of bmap and page caches39 * @mi_blocks_per_group: number of blocks in a group40 * @mi_blocks_per_desc_block: number of blocks per descriptor block41 */42struct nilfs_mdt_info {43 struct rw_semaphore mi_sem;44 struct blockgroup_lock *mi_bgl;45 unsigned int mi_entry_size;46 unsigned int mi_first_entry_offset;47 unsigned long mi_entries_per_block;48 struct nilfs_palloc_cache *mi_palloc_cache;49 struct nilfs_shadow_map *mi_shadow;50 unsigned long mi_blocks_per_group;51 unsigned long mi_blocks_per_desc_block;52};53 54static inline struct nilfs_mdt_info *NILFS_MDT(const struct inode *inode)55{56 return inode->i_private;57}58 59static inline int nilfs_is_metadata_file_inode(const struct inode *inode)60{61 return inode->i_private != NULL;62}63 64/* Default GFP flags using highmem */65#define NILFS_MDT_GFP (__GFP_RECLAIM | __GFP_IO | __GFP_HIGHMEM)66 67int nilfs_mdt_get_block(struct inode *, unsigned long, int,68 void (*init_block)(struct inode *,69 struct buffer_head *, void *),70 struct buffer_head **);71int nilfs_mdt_find_block(struct inode *inode, unsigned long start,72 unsigned long end, unsigned long *blkoff,73 struct buffer_head **out_bh);74int nilfs_mdt_delete_block(struct inode *, unsigned long);75int nilfs_mdt_forget_block(struct inode *, unsigned long);76int nilfs_mdt_fetch_dirty(struct inode *);77 78int nilfs_mdt_init(struct inode *inode, gfp_t gfp_mask, size_t objsz);79void nilfs_mdt_clear(struct inode *inode);80void nilfs_mdt_destroy(struct inode *inode);81 82void nilfs_mdt_set_entry_size(struct inode *, unsigned int, unsigned int);83 84int nilfs_mdt_setup_shadow_map(struct inode *inode,85 struct nilfs_shadow_map *shadow);86int nilfs_mdt_save_to_shadow_map(struct inode *inode);87void nilfs_mdt_restore_from_shadow_map(struct inode *inode);88void nilfs_mdt_clear_shadow_map(struct inode *inode);89int nilfs_mdt_freeze_buffer(struct inode *inode, struct buffer_head *bh);90struct buffer_head *nilfs_mdt_get_frozen_buffer(struct inode *inode,91 struct buffer_head *bh);92 93static inline void nilfs_mdt_mark_dirty(struct inode *inode)94{95 if (!test_bit(NILFS_I_DIRTY, &NILFS_I(inode)->i_state))96 set_bit(NILFS_I_DIRTY, &NILFS_I(inode)->i_state);97}98 99static inline void nilfs_mdt_clear_dirty(struct inode *inode)100{101 clear_bit(NILFS_I_DIRTY, &NILFS_I(inode)->i_state);102}103 104static inline __u64 nilfs_mdt_cno(struct inode *inode)105{106 return ((struct the_nilfs *)inode->i_sb->s_fs_info)->ns_cno;107}108 109static inline spinlock_t *110nilfs_mdt_bgl_lock(struct inode *inode, unsigned int block_group)111{112 return bgl_lock_ptr(NILFS_MDT(inode)->mi_bgl, block_group);113}114 115#endif /* _NILFS_MDT_H */116