cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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mdt.h (3662B)

      1/* SPDX-License-Identifier: GPL-2.0+ */
      2/*
      3 * NILFS meta data file prototype and definitions
      4 *
      5 * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.
      6 *
      7 * Written by Ryusuke Konishi.
      8 */
      9
     10#ifndef _NILFS_MDT_H
     11#define _NILFS_MDT_H
     12
     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 file
     20 * @bmap_store: shadow copy of bmap state
     21 * @inode: holder of page caches used in shadow mapping
     22 * @frozen_buffers: list of frozen buffers
     23 */
     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 files
     32 * @mi_sem: reader/writer semaphore for meta data operations
     33 * @mi_bgl: per-blockgroup locking
     34 * @mi_entry_size: size of an entry
     35 * @mi_first_entry_offset: offset to the first entry
     36 * @mi_entries_per_block: number of entries in a block
     37 * @mi_palloc_cache: persistent object allocator cache
     38 * @mi_shadow: shadow of bmap and page caches
     39 * @mi_blocks_per_group: number of blocks in a group
     40 * @mi_blocks_per_desc_block: number of blocks per descriptor block
     41 */
     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 */