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 */ 43 struct 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 55 static inline struct nilfs_mdt_info *NILFS_MDT(const struct inode *inode) 56 { 57 return inode->i_private; 58 } 59 60 static 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 70 int nilfs_mdt_get_block(struct inode *, unsigned long, int, 71 void (*init_block)(struct inode *, 72 struct buffer_head *, void *), 73 struct buffer_head **); 74 int nilfs_mdt_delete_block(struct inode *, unsigned long); 75 int nilfs_mdt_forget_block(struct inode *, unsigned long); 76 int nilfs_mdt_mark_block_dirty(struct inode *, unsigned long); 77 int nilfs_mdt_fetch_dirty(struct inode *); 78 79 int nilfs_mdt_init(struct inode *inode, struct the_nilfs *nilfs, 80 gfp_t gfp_mask, size_t objsz); 81 struct inode *nilfs_mdt_new(struct the_nilfs *, struct super_block *, ino_t, 82 size_t); 83 struct inode *nilfs_mdt_new_common(struct the_nilfs *, struct super_block *, 84 ino_t); 85 void nilfs_mdt_destroy(struct inode *); 86 void nilfs_mdt_set_entry_size(struct inode *, unsigned, unsigned); 87 void nilfs_mdt_set_shadow(struct inode *, struct inode *); 88 89 90 #define nilfs_mdt_mark_buffer_dirty(bh) nilfs_mark_buffer_dirty(bh) 91 92 static inline void nilfs_mdt_mark_dirty(struct inode *inode) 93 { 94 if (!test_bit(NILFS_I_DIRTY, &NILFS_I(inode)->i_state)) 95 set_bit(NILFS_I_DIRTY, &NILFS_I(inode)->i_state); 96 } 97 98 static inline void nilfs_mdt_clear_dirty(struct inode *inode) 99 { 100 clear_bit(NILFS_I_DIRTY, &NILFS_I(inode)->i_state); 101 } 102 103 static inline __u64 nilfs_mdt_cno(struct inode *inode) 104 { 105 return NILFS_MDT(inode)->mi_nilfs->ns_cno; 106 } 107 108 #define nilfs_mdt_bgl_lock(inode, bg) \ 109 (&NILFS_MDT(inode)->mi_bgl->locks[(bg) & (NR_BG_LOCKS-1)].lock) 110 111 #endif /* _NILFS_MDT_H */ 112