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TOMOYO Linux Cross Reference
Linux/fs/nilfs2/mdt.h

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  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_shadow_map - shadow mapping of meta data file
 33  * @bmap_store: shadow copy of bmap state
 34  * @frozen_data: shadowed dirty data pages
 35  * @frozen_btnodes: shadowed dirty b-tree nodes' pages
 36  * @frozen_buffers: list of frozen buffers
 37  */
 38 struct nilfs_shadow_map {
 39         struct nilfs_bmap_store bmap_store;
 40         struct address_space frozen_data;
 41         struct address_space frozen_btnodes;
 42         struct list_head frozen_buffers;
 43 };
 44 
 45 /**
 46  * struct nilfs_mdt_info - on-memory private data of meta data files
 47  * @mi_sem: reader/writer semaphore for meta data operations
 48  * @mi_bgl: per-blockgroup locking
 49  * @mi_entry_size: size of an entry
 50  * @mi_first_entry_offset: offset to the first entry
 51  * @mi_entries_per_block: number of entries in a block
 52  * @mi_palloc_cache: persistent object allocator cache
 53  * @mi_shadow: shadow of bmap and page caches
 54  * @mi_blocks_per_group: number of blocks in a group
 55  * @mi_blocks_per_desc_block: number of blocks per descriptor block
 56  */
 57 struct nilfs_mdt_info {
 58         struct rw_semaphore     mi_sem;
 59         struct blockgroup_lock *mi_bgl;
 60         unsigned                mi_entry_size;
 61         unsigned                mi_first_entry_offset;
 62         unsigned long           mi_entries_per_block;
 63         struct nilfs_palloc_cache *mi_palloc_cache;
 64         struct nilfs_shadow_map *mi_shadow;
 65         unsigned long           mi_blocks_per_group;
 66         unsigned long           mi_blocks_per_desc_block;
 67 };
 68 
 69 static inline struct nilfs_mdt_info *NILFS_MDT(const struct inode *inode)
 70 {
 71         return inode->i_private;
 72 }
 73 
 74 /* Default GFP flags using highmem */
 75 #define NILFS_MDT_GFP      (__GFP_RECLAIM | __GFP_IO | __GFP_HIGHMEM)
 76 
 77 int nilfs_mdt_get_block(struct inode *, unsigned long, int,
 78                         void (*init_block)(struct inode *,
 79                                            struct buffer_head *, void *),
 80                         struct buffer_head **);
 81 int nilfs_mdt_find_block(struct inode *inode, unsigned long start,
 82                          unsigned long end, unsigned long *blkoff,
 83                          struct buffer_head **out_bh);
 84 int nilfs_mdt_delete_block(struct inode *, unsigned long);
 85 int nilfs_mdt_forget_block(struct inode *, unsigned long);
 86 int nilfs_mdt_mark_block_dirty(struct inode *, unsigned long);
 87 int nilfs_mdt_fetch_dirty(struct inode *);
 88 
 89 int nilfs_mdt_init(struct inode *inode, gfp_t gfp_mask, size_t objsz);
 90 void nilfs_mdt_set_entry_size(struct inode *, unsigned, unsigned);
 91 
 92 int nilfs_mdt_setup_shadow_map(struct inode *inode,
 93                                struct nilfs_shadow_map *shadow);
 94 int nilfs_mdt_save_to_shadow_map(struct inode *inode);
 95 void nilfs_mdt_restore_from_shadow_map(struct inode *inode);
 96 void nilfs_mdt_clear_shadow_map(struct inode *inode);
 97 int nilfs_mdt_freeze_buffer(struct inode *inode, struct buffer_head *bh);
 98 struct buffer_head *nilfs_mdt_get_frozen_buffer(struct inode *inode,
 99                                                 struct buffer_head *bh);
100 
101 static inline void nilfs_mdt_mark_dirty(struct inode *inode)
102 {
103         if (!test_bit(NILFS_I_DIRTY, &NILFS_I(inode)->i_state))
104                 set_bit(NILFS_I_DIRTY, &NILFS_I(inode)->i_state);
105 }
106 
107 static inline void nilfs_mdt_clear_dirty(struct inode *inode)
108 {
109         clear_bit(NILFS_I_DIRTY, &NILFS_I(inode)->i_state);
110 }
111 
112 static inline __u64 nilfs_mdt_cno(struct inode *inode)
113 {
114         return ((struct the_nilfs *)inode->i_sb->s_fs_info)->ns_cno;
115 }
116 
117 static inline spinlock_t *
118 nilfs_mdt_bgl_lock(struct inode *inode, unsigned int block_group)
119 {
120         return bgl_lock_ptr(NILFS_MDT(inode)->mi_bgl, block_group);
121 }
122 
123 #endif /* _NILFS_MDT_H */
124 

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