1/* 2 * mdt.h - NILFS meta data file prototype and definitions 3 * 4 * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation. 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License, or 9 * (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program; if not, write to the Free Software 18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA 19 * 20 * Written by Ryusuke Konishi <ryusuke@osrg.net> 21 */ 22 23#ifndef _NILFS_MDT_H 24#define _NILFS_MDT_H 25 26#include <linux/buffer_head.h> 27#include <linux/blockgroup_lock.h> 28#include "nilfs.h" 29#include "page.h" 30 31/** 32 * struct nilfs_mdt_info - on-memory private data of meta data files 33 * @mi_nilfs: back pointer to the_nilfs struct 34 * @mi_sem: reader/writer semaphore for meta data operations 35 * @mi_bgl: per-blockgroup locking 36 * @mi_entry_size: size of an entry 37 * @mi_first_entry_offset: offset to the first entry 38 * @mi_entries_per_block: number of entries in a block 39 * @mi_palloc_cache: persistent object allocator cache 40 * @mi_blocks_per_group: number of blocks in a group 41 * @mi_blocks_per_desc_block: number of blocks per descriptor block 42 */ 43struct nilfs_mdt_info { 44 struct the_nilfs *mi_nilfs; 45 struct rw_semaphore mi_sem; 46 struct blockgroup_lock *mi_bgl; 47 unsigned mi_entry_size; 48 unsigned mi_first_entry_offset; 49 unsigned long mi_entries_per_block; 50 struct nilfs_palloc_cache *mi_palloc_cache; 51 unsigned long mi_blocks_per_group; 52 unsigned long mi_blocks_per_desc_block; 53}; 54 55static inline struct nilfs_mdt_info *NILFS_MDT(const struct inode *inode) 56{ 57 return inode->i_private; 58} 59 60static inline struct the_nilfs *NILFS_I_NILFS(struct inode *inode) 61{ 62 struct super_block *sb = inode->i_sb; 63 64 return sb ? NILFS_SB(sb)->s_nilfs : NILFS_MDT(inode)->mi_nilfs; 65} 66 67/* Default GFP flags using highmem */ 68#define NILFS_MDT_GFP (__GFP_WAIT | __GFP_IO | __GFP_HIGHMEM) 69 70int nilfs_mdt_get_block(struct inode *, unsigned long, int, 71 void (*init_block)(struct inode *, 72 struct buffer_head *, void *), 73 struct buffer_head **); 74int nilfs_mdt_delete_block(struct inode *, unsigned long); 75int nilfs_mdt_forget_block(struct inode *, unsigned long); 76int nilfs_mdt_mark_block_dirty(struct inode *, unsigned long); 77int nilfs_mdt_fetch_dirty(struct inode *); 78 79struct inode *nilfs_mdt_new(struct the_nilfs *, struct super_block *, ino_t, 80 size_t); 81struct inode *nilfs_mdt_new_common(struct the_nilfs *, struct super_block *, 82 ino_t, gfp_t, size_t); 83void nilfs_mdt_destroy(struct inode *); 84void nilfs_mdt_set_entry_size(struct inode *, unsigned, unsigned); 85void nilfs_mdt_set_shadow(struct inode *, struct inode *); 86 87 88#define nilfs_mdt_mark_buffer_dirty(bh) nilfs_mark_buffer_dirty(bh) 89 90static inline void nilfs_mdt_mark_dirty(struct inode *inode) 91{ 92 if (!test_bit(NILFS_I_DIRTY, &NILFS_I(inode)->i_state)) 93 set_bit(NILFS_I_DIRTY, &NILFS_I(inode)->i_state); 94} 95 96static inline void nilfs_mdt_clear_dirty(struct inode *inode) 97{ 98 clear_bit(NILFS_I_DIRTY, &NILFS_I(inode)->i_state); 99} 100 101static inline __u64 nilfs_mdt_cno(struct inode *inode) 102{ 103 return NILFS_MDT(inode)->mi_nilfs->ns_cno; 104} 105 106#define nilfs_mdt_bgl_lock(inode, bg) \ 107 (&NILFS_MDT(inode)->mi_bgl->locks[(bg) & (NR_BG_LOCKS-1)].lock) 108 109#endif /* _NILFS_MDT_H */ 110