[net-next-2.6.git] / fs / jffs2 / jffs2_fs_sb.h

/*
 * JFFS2 -- Journalling Flash File System, Version 2.
 *
 * Copyright © 2001-2007 Red Hat, Inc.
 * Copyright © 2004-2010 David Woodhouse <dwmw2@infradead.org>
 *
 * Created by David Woodhouse <dwmw2@infradead.org>
 *
 * For licensing information, see the file 'LICENCE' in this directory.
 *
 */

#ifndef _JFFS2_FS_SB
#define _JFFS2_FS_SB

#include <linux/types.h>
#include <linux/spinlock.h>
#include <linux/workqueue.h>
#include <linux/completion.h>
#include <linux/mutex.h>
#include <linux/timer.h>
#include <linux/wait.h>
#include <linux/list.h>
#include <linux/rwsem.h>

#define JFFS2_SB_FLAG_RO 1
#define JFFS2_SB_FLAG_SCANNING 2 /* Flash scanning is in progress */
#define JFFS2_SB_FLAG_BUILDING 4 /* File system building is in progress */

struct jffs2_inodirty;

/* A struct for the overall file system control.  Pointers to
   jffs2_sb_info structs are named `c' in the source code.
   Nee jffs_control
*/
struct jffs2_sb_info {
	struct mtd_info *mtd;

	uint32_t highest_ino;
	uint32_t checked_ino;

	unsigned int flags;

	struct task_struct *gc_task;	/* GC task struct */
	struct completion gc_thread_start; /* GC thread start completion */
	struct completion gc_thread_exit; /* GC thread exit completion port */

	struct mutex alloc_sem;		/* Used to protect all the following
					   fields, and also to protect against
					   out-of-order writing of nodes. And GC. */
	uint32_t cleanmarker_size;	/* Size of an _inline_ CLEANMARKER
					 (i.e. zero for OOB CLEANMARKER */

	uint32_t flash_size;
	uint32_t used_size;
	uint32_t dirty_size;
	uint32_t wasted_size;
	uint32_t free_size;
	uint32_t erasing_size;
	uint32_t bad_size;
	uint32_t sector_size;
	uint32_t unchecked_size;

	uint32_t nr_free_blocks;
	uint32_t nr_erasing_blocks;

	/* Number of free blocks there must be before we... */
	uint8_t resv_blocks_write;	/* ... allow a normal filesystem write */
	uint8_t resv_blocks_deletion;	/* ... allow a normal filesystem deletion */
	uint8_t resv_blocks_gctrigger;	/* ... wake up the GC thread */
	uint8_t resv_blocks_gcbad;	/* ... pick a block from the bad_list to GC */
	uint8_t resv_blocks_gcmerge;	/* ... merge pages when garbage collecting */
	/* Number of 'very dirty' blocks before we trigger immediate GC */
	uint8_t vdirty_blocks_gctrigger;

	uint32_t nospc_dirty_size;

	uint32_t nr_blocks;
	struct jffs2_eraseblock *blocks;	/* The whole array of blocks. Used for getting blocks
						 * from the offset (blocks[ofs / sector_size]) */
	struct jffs2_eraseblock *nextblock;	/* The block we're currently filling */

	struct jffs2_eraseblock *gcblock;	/* The block we're currently garbage-collecting */

	struct list_head clean_list;		/* Blocks 100% full of clean data */
	struct list_head very_dirty_list;	/* Blocks with lots of dirty space */
	struct list_head dirty_list;		/* Blocks with some dirty space */
	struct list_head erasable_list;		/* Blocks which are completely dirty, and need erasing */
	struct list_head erasable_pending_wbuf_list;	/* Blocks which need erasing but only after the current wbuf is flushed */
	struct list_head erasing_list;		/* Blocks which are currently erasing */
	struct list_head erase_checking_list;	/* Blocks which are being checked and marked */
	struct list_head erase_pending_list;	/* Blocks which need erasing now */
	struct list_head erase_complete_list;	/* Blocks which are erased and need the clean marker written to them */
	struct list_head free_list;		/* Blocks which are free and ready to be used */
	struct list_head bad_list;		/* Bad blocks. */
	struct list_head bad_used_list;		/* Bad blocks with valid data in. */

	spinlock_t erase_completion_lock;	/* Protect free_list and erasing_list
						   against erase completion handler */
	wait_queue_head_t erase_wait;		/* For waiting for erases to complete */

	wait_queue_head_t inocache_wq;
	int inocache_hashsize;
	struct jffs2_inode_cache **inocache_list;
	spinlock_t inocache_lock;

	/* Sem to allow jffs2_garbage_collect_deletion_dirent to
	   drop the erase_completion_lock while it's holding a pointer
	   to an obsoleted node. I don't like this. Alternatives welcomed. */
	struct mutex erase_free_sem;

	uint32_t wbuf_pagesize; /* 0 for NOR and other flashes with no wbuf */

#ifdef CONFIG_JFFS2_FS_WBUF_VERIFY
	unsigned char *wbuf_verify; /* read-back buffer for verification */
#endif
#ifdef CONFIG_JFFS2_FS_WRITEBUFFER
	unsigned char *wbuf; /* Write-behind buffer for NAND flash */
	uint32_t wbuf_ofs;
	uint32_t wbuf_len;
	struct jffs2_inodirty *wbuf_inodes;
	struct rw_semaphore wbuf_sem;	/* Protects the write buffer */

	unsigned char *oobbuf;
	int oobavail; /* How many bytes are available for JFFS2 in OOB */
#endif

	struct jffs2_summary *summary;		/* Summary information */

#ifdef CONFIG_JFFS2_FS_XATTR
#define XATTRINDEX_HASHSIZE	(57)
	uint32_t highest_xid;
	uint32_t highest_xseqno;
	struct list_head xattrindex[XATTRINDEX_HASHSIZE];
	struct list_head xattr_unchecked;
	struct list_head xattr_dead_list;
	struct jffs2_xattr_ref *xref_dead_list;
	struct jffs2_xattr_ref *xref_temp;
	struct rw_semaphore xattr_sem;
	uint32_t xdatum_mem_usage;
	uint32_t xdatum_mem_threshold;
#endif
	/* OS-private pointer for getting back to master superblock info */
	void *os_priv;
};

#endif /* _JFFS2_FB_SB */
Commit	Line	Data
c00c310e DW	1	/*
	2	* JFFS2 -- Journalling Flash File System, Version 2.
	3	*
	4	* Copyright © 2001-2007 Red Hat, Inc.
6088c058	5	* Copyright © 2004-2010 David Woodhouse <dwmw2@infradead.org>
c00c310e DW	6	*
	7	* Created by David Woodhouse <dwmw2@infradead.org>
	8	*
	9	* For licensing information, see the file 'LICENCE' in this directory.
	10	*
	11	*/
1da177e4 LT	12
	13	#ifndef _JFFS2_FS_SB
	14	#define _JFFS2_FS_SB
	15
	16	#include <linux/types.h>
	17	#include <linux/spinlock.h>
	18	#include <linux/workqueue.h>
	19	#include <linux/completion.h>
ced22070	20	#include <linux/mutex.h>
1da177e4 LT	21	#include <linux/timer.h>
	22	#include <linux/wait.h>
	23	#include <linux/list.h>
	24	#include <linux/rwsem.h>
	25
	26	#define JFFS2_SB_FLAG_RO 1
31fbdf7a AB	27	#define JFFS2_SB_FLAG_SCANNING 2 /* Flash scanning is in progress */
31fbdf7a AB	28	#define JFFS2_SB_FLAG_BUILDING 4 /* File system building is in progress */
1da177e4 LT	29
	30	struct jffs2_inodirty;
	31
	32	/* A struct for the overall file system control. Pointers to
182ec4ee	33	jffs2_sb_info structs are named `c' in the source code.
1da177e4 LT	34	Nee jffs_control
	35	*/
	36	struct jffs2_sb_info {
	37	struct mtd_info *mtd;
	38
	39	uint32_t highest_ino;
	40	uint32_t checked_ino;
	41
	42	unsigned int flags;
	43
	44	struct task_struct gc_task; / GC task struct */
fff7afd7	45	struct completion gc_thread_start; /* GC thread start completion */
1da177e4 LT	46	struct completion gc_thread_exit; /* GC thread exit completion port */
1da177e4 LT	47
ced22070	48	struct mutex alloc_sem; /* Used to protect all the following
1da177e4 LT	49	fields, and also to protect against
	50	out-of-order writing of nodes. And GC. */
	51	uint32_t cleanmarker_size; /* Size of an _inline_ CLEANMARKER
	52	(i.e. zero for OOB CLEANMARKER */
	53
	54	uint32_t flash_size;
	55	uint32_t used_size;
	56	uint32_t dirty_size;
	57	uint32_t wasted_size;
	58	uint32_t free_size;
	59	uint32_t erasing_size;
	60	uint32_t bad_size;
	61	uint32_t sector_size;
	62	uint32_t unchecked_size;
	63
	64	uint32_t nr_free_blocks;
	65	uint32_t nr_erasing_blocks;
	66
	67	/* Number of free blocks there must be before we... */
	68	uint8_t resv_blocks_write; /* ... allow a normal filesystem write */
	69	uint8_t resv_blocks_deletion; /* ... allow a normal filesystem deletion */
	70	uint8_t resv_blocks_gctrigger; /* ... wake up the GC thread */
	71	uint8_t resv_blocks_gcbad; /* ... pick a block from the bad_list to GC */
	72	uint8_t resv_blocks_gcmerge; /* ... merge pages when garbage collecting */
8fb870df DW	73	/* Number of 'very dirty' blocks before we trigger immediate GC */
8fb870df DW	74	uint8_t vdirty_blocks_gctrigger;
1da177e4 LT	75
	76	uint32_t nospc_dirty_size;
	77
	78	uint32_t nr_blocks;
182ec4ee	79	struct jffs2_eraseblock blocks; / The whole array of blocks. Used for getting blocks
1da177e4 LT	80	* from the offset (blocks[ofs / sector_size]) */
	81	struct jffs2_eraseblock nextblock; / The block we're currently filling */
	82
	83	struct jffs2_eraseblock gcblock; / The block we're currently garbage-collecting */
	84
	85	struct list_head clean_list; /* Blocks 100% full of clean data */
	86	struct list_head very_dirty_list; /* Blocks with lots of dirty space */
	87	struct list_head dirty_list; /* Blocks with some dirty space */
	88	struct list_head erasable_list; /* Blocks which are completely dirty, and need erasing */
	89	struct list_head erasable_pending_wbuf_list; /* Blocks which need erasing but only after the current wbuf is flushed */
	90	struct list_head erasing_list; /* Blocks which are currently erasing */
e2bc322b	91	struct list_head erase_checking_list; /* Blocks which are being checked and marked */
1da177e4 LT	92	struct list_head erase_pending_list; /* Blocks which need erasing now */
	93	struct list_head erase_complete_list; /* Blocks which are erased and need the clean marker written to them */
	94	struct list_head free_list; /* Blocks which are free and ready to be used */
	95	struct list_head bad_list; /* Bad blocks. */
	96	struct list_head bad_used_list; /* Bad blocks with valid data in. */
	97
182ec4ee	98	spinlock_t erase_completion_lock; /* Protect free_list and erasing_list
1da177e4 LT	99	against erase completion handler */
	100	wait_queue_head_t erase_wait; /* For waiting for erases to complete */
	101
	102	wait_queue_head_t inocache_wq;
65e5a0e1	103	int inocache_hashsize;
1da177e4 LT	104	struct jffs2_inode_cache **inocache_list;
1da177e4 LT	105	spinlock_t inocache_lock;
182ec4ee	106
1da177e4	107	/* Sem to allow jffs2_garbage_collect_deletion_dirent to
182ec4ee	108	drop the erase_completion_lock while it's holding a pointer
1da177e4	109	to an obsoleted node. I don't like this. Alternatives welcomed. */
ced22070	110	struct mutex erase_free_sem;
1da177e4	111
733802d9	112	uint32_t wbuf_pagesize; /* 0 for NOR and other flashes with no wbuf */
182ec4ee	113
a6bc432e DW	114	#ifdef CONFIG_JFFS2_FS_WBUF_VERIFY
	115	unsigned char wbuf_verify; / read-back buffer for verification */
	116	#endif
2f82ce1e	117	#ifdef CONFIG_JFFS2_FS_WRITEBUFFER
a7a6ace1	118	unsigned char wbuf; / Write-behind buffer for NAND flash */
1da177e4 LT	119	uint32_t wbuf_ofs;
1da177e4 LT	120	uint32_t wbuf_len;
1da177e4	121	struct jffs2_inodirty *wbuf_inodes;
1da177e4 LT	122	struct rw_semaphore wbuf_sem; /* Protects the write buffer */
1da177e4 LT	123
a7a6ace1 AB	124	unsigned char *oobbuf;
a7a6ace1 AB	125	int oobavail; /* How many bytes are available for JFFS2 in OOB */
1da177e4 LT	126	#endif
1da177e4 LT	127
e631ddba FH	128	struct jffs2_summary summary; / Summary information */
e631ddba FH	129
aa98d7cf KK	130	#ifdef CONFIG_JFFS2_FS_XATTR
	131	#define XATTRINDEX_HASHSIZE (57)
	132	uint32_t highest_xid;
c9f700f8	133	uint32_t highest_xseqno;
aa98d7cf	134	struct list_head xattrindex[XATTRINDEX_HASHSIZE];
aa98d7cf	135	struct list_head xattr_unchecked;
c9f700f8 KK	136	struct list_head xattr_dead_list;
c9f700f8 KK	137	struct jffs2_xattr_ref *xref_dead_list;
8f2b6f49	138	struct jffs2_xattr_ref *xref_temp;
aa98d7cf KK	139	struct rw_semaphore xattr_sem;
	140	uint32_t xdatum_mem_usage;
	141	uint32_t xdatum_mem_threshold;
	142	#endif
1da177e4 LT	143	/* OS-private pointer for getting back to master superblock info */
	144	void *os_priv;
	145	};
	146
	147	#endif /* _JFFS2_FB_SB */