affs_fs_i.h

ARM 嵌入式 系统 设计与实例开发 实验教材 二源码

#ifndef _AFFS_FS_I
#define _AFFS_FS_I

#include <linux/a.out.h>

// move this to linux/coda.h!!!
#include <linux/time.h>

#define AFFS_CACHE_SIZE		PAGE_SIZE
//#define AFFS_CACHE_SIZE		(4*4)

#define AFFS_MAX_PREALLOC	32
#define AFFS_LC_SIZE		(AFFS_CACHE_SIZE/sizeof(u32)/2)
#define AFFS_AC_SIZE		(AFFS_CACHE_SIZE/sizeof(struct affs_ext_key)/2)
#define AFFS_AC_MASK		(AFFS_AC_SIZE-1)

struct affs_ext_key {
	u32	ext;				/* idx of the extended block */
	u32	key;				/* block number */
};

/*
 * affs fs inode data in memory
 */
struct affs_inode_info {
	u32	 i_opencnt;
	struct semaphore i_link_lock;		/* Protects internal inode access. */
	struct semaphore i_ext_lock;		/* Protects internal inode access. */
#define i_hash_lock i_ext_lock
	u32	 i_blkcnt;			/* block count */
	u32	 i_extcnt;			/* extended block count */
	u32	*i_lc;				/* linear cache of extended blocks */
	u32	 i_lc_size;
	u32	 i_lc_shift;
	u32	 i_lc_mask;
	struct affs_ext_key *i_ac;		/* associative cache of extended blocks */
	u32	 i_ext_last;			/* last accessed extended block */
	struct buffer_head *i_ext_bh;		/* bh of last extended block */
	unsigned long mmu_private;
	u32	 i_protect;			/* unused attribute bits */
	u32	 i_lastalloc;			/* last allocated block */
	int	 i_pa_cnt;			/* number of preallocated blocks */
#if 0
	s32	 i_original;			/* if != 0, this is the key of the original */
	u32	 i_data[AFFS_MAX_PREALLOC];	/* preallocated blocks */
	int	 i_cache_users;			/* Cache cannot be freed while > 0 */
	unsigned char i_hlink;			/* This is a fake */
	unsigned char i_pad;
	s32	 i_parent;			/* parent ino */
#endif
};

/* short cut to get to the affs specific inode data */
#define AFFS_INODE	(&inode->u.affs_i)
#define AFFS_DIR	(&dir->u.affs_i)

#endif