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#ifndef _NILFS_MDT_H
#define _NILFS_MDT_H
#include <linux/buffer_head.h>
#include <linux/blockgroup_lock.h>
#include "nilfs.h"
#include "page.h"
struct nilfs_shadow_map {
struct nilfs_bmap_store bmap_store;
struct address_space frozen_data;
struct address_space frozen_btnodes;
struct list_head frozen_buffers;
};
struct nilfs_mdt_info {
struct rw_semaphore mi_sem;
struct blockgroup_lock *mi_bgl;
unsigned mi_entry_size;
unsigned mi_first_entry_offset;
unsigned long mi_entries_per_block;
struct nilfs_palloc_cache *mi_palloc_cache;
struct nilfs_shadow_map *mi_shadow;
unsigned long mi_blocks_per_group;
unsigned long mi_blocks_per_desc_block;
};
static inline struct nilfs_mdt_info *NILFS_MDT(const struct inode *inode)
{
return inode->i_private;
}
#define NILFS_MDT_GFP (__GFP_WAIT | __GFP_IO | __GFP_HIGHMEM)
int nilfs_mdt_get_block(struct inode *, unsigned long, int,
void (*init_block)(struct inode *,
struct buffer_head *, void *),
struct buffer_head **);
int nilfs_mdt_delete_block(struct inode *, unsigned long);
int nilfs_mdt_forget_block(struct inode *, unsigned long);
int nilfs_mdt_mark_block_dirty(struct inode *, unsigned long);
int nilfs_mdt_fetch_dirty(struct inode *);
int nilfs_mdt_init(struct inode *inode, gfp_t gfp_mask, size_t objsz);
void nilfs_mdt_set_entry_size(struct inode *, unsigned, unsigned);
int nilfs_mdt_setup_shadow_map(struct inode *inode,
struct nilfs_shadow_map *shadow);
int nilfs_mdt_save_to_shadow_map(struct inode *inode);
void nilfs_mdt_restore_from_shadow_map(struct inode *inode);
void nilfs_mdt_clear_shadow_map(struct inode *inode);
int nilfs_mdt_freeze_buffer(struct inode *inode, struct buffer_head *bh);
struct buffer_head *nilfs_mdt_get_frozen_buffer(struct inode *inode,
struct buffer_head *bh);
static inline void nilfs_mdt_mark_dirty(struct inode *inode)
{
if (!test_bit(NILFS_I_DIRTY, &NILFS_I(inode)->i_state))
set_bit(NILFS_I_DIRTY, &NILFS_I(inode)->i_state);
}
static inline void nilfs_mdt_clear_dirty(struct inode *inode)
{
clear_bit(NILFS_I_DIRTY, &NILFS_I(inode)->i_state);
}
static inline __u64 nilfs_mdt_cno(struct inode *inode)
{
return ((struct the_nilfs *)inode->i_sb->s_fs_info)->ns_cno;
}
#define nilfs_mdt_bgl_lock(inode, bg) \
(&NILFS_MDT(inode)->mi_bgl->locks[(bg) & (NR_BG_LOCKS-1)].lock)
#endif /* _NILFS_MDT_H */
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