1/* $Id: jffs2_fs_sb.h,v 1.1.1.1 2008/10/15 03:27:30 james26_jang Exp $ */
2
3#ifndef _JFFS2_FS_SB
4#define _JFFS2_FS_SB
5
6#include <linux/types.h>
7#include <linux/spinlock.h>
8#include <linux/completion.h>
9#include <asm/semaphore.h>
10#include <linux/list.h>
11
12#define INOCACHE_HASHSIZE 1
13
14#define JFFS2_SB_FLAG_RO 1
15#define JFFS2_SB_FLAG_MOUNTING 2
16
17/* A struct for the overall file system control.  Pointers to
18   jffs2_sb_info structs are named `c' in the source code.
19   Nee jffs_control
20*/
21struct jffs2_sb_info {
22	struct mtd_info *mtd;
23
24	__u32 highest_ino;
25	unsigned int flags;
26	spinlock_t nodelist_lock;
27
28	//	pid_t thread_pid;		/* GC thread's PID */
29	struct task_struct *gc_task;	/* GC task struct */
30	struct semaphore gc_thread_start; /* GC thread start mutex */
31	struct completion gc_thread_exit; /* GC thread exit completion port */
32	//	__u32 gc_minfree_threshold;	/* GC trigger thresholds */
33	//	__u32 gc_maxdirty_threshold;
34
35	struct semaphore alloc_sem;	/* Used to protect all the following
36					   fields, and also to protect against
37					   out-of-order writing of nodes.
38					   And GC.
39					*/
40	__u32 flash_size;
41	__u32 used_size;
42	__u32 dirty_size;
43	__u32 free_size;
44	__u32 erasing_size;
45	__u32 bad_size;
46	__u32 sector_size;
47	//	__u32 min_free_size;
48	//	__u32 max_chunk_size;
49
50	__u32 nr_free_blocks;
51	__u32 nr_erasing_blocks;
52
53	__u32 nr_blocks;
54	struct jffs2_eraseblock *blocks;	/* The whole array of blocks. Used for getting blocks
55						 * from the offset (blocks[ofs / sector_size]) */
56	struct jffs2_eraseblock *nextblock;	/* The block we're currently filling */
57
58	struct jffs2_eraseblock *gcblock;	/* The block we're currently garbage-collecting */
59
60	struct list_head clean_list;		/* Blocks 100% full of clean data */
61	struct list_head dirty_list;		/* Blocks with some dirty space */
62	struct list_head erasing_list;		/* Blocks which are currently erasing */
63	struct list_head erase_pending_list;	/* Blocks which need erasing */
64	struct list_head erase_complete_list;	/* Blocks which are erased and need the clean marker written to them */
65	struct list_head free_list;		/* Blocks which are free and ready to be used */
66	struct list_head bad_list;		/* Bad blocks. */
67	struct list_head bad_used_list;		/* Bad blocks with valid data in. */
68
69	spinlock_t erase_completion_lock;	/* Protect free_list and erasing_list
70						   against erase completion handler */
71	wait_queue_head_t erase_wait;		/* For waiting for erases to complete */
72	struct jffs2_inode_cache *inocache_list[INOCACHE_HASHSIZE];
73	spinlock_t inocache_lock;
74};
75
76#ifdef JFFS2_OUT_OF_KERNEL
77#define JFFS2_SB_INFO(sb) ((struct jffs2_sb_info *) &(sb)->u)
78#else
79#define JFFS2_SB_INFO(sb) (&sb->u.jffs2_sb)
80#endif
81
82#define OFNI_BS_2SFFJ(c)  ((struct super_block *) ( ((char *)c) - ((char *)(&((struct super_block *)NULL)->u)) ) )
83
84#endif /* _JFFS2_FB_SB */
85