[mirror_ubuntu-artful-kernel.git] / fs / ext4 / extents_status.h

/*
 *  fs/ext4/extents_status.h
 *
 * Written by Yongqiang Yang <xiaoqiangnk@gmail.com>
 * Modified by
 *	Allison Henderson <achender@linux.vnet.ibm.com>
 *	Zheng Liu <wenqing.lz@taobao.com>
 *
 */

#ifndef _EXT4_EXTENTS_STATUS_H
#define _EXT4_EXTENTS_STATUS_H

/*
 * Turn on ES_DEBUG__ to get lots of info about extent status operations.
 */
#ifdef ES_DEBUG__
#define es_debug(fmt, ...)	printk(fmt, ##__VA_ARGS__)
#else
#define es_debug(fmt, ...)	no_printk(fmt, ##__VA_ARGS__)
#endif

/*
 * With ES_AGGRESSIVE_TEST defined, the result of es caching will be
 * checked with old map_block's result.
 */
#define ES_AGGRESSIVE_TEST__

/*
 * These flags live in the high bits of extent_status.es_pblk
 */
#define ES_SHIFT	60

#define EXTENT_STATUS_WRITTEN	(1 << 3)
#define EXTENT_STATUS_UNWRITTEN (1 << 2)
#define EXTENT_STATUS_DELAYED	(1 << 1)
#define EXTENT_STATUS_HOLE	(1 << 0)

#define EXTENT_STATUS_FLAGS	(EXTENT_STATUS_WRITTEN | \
				 EXTENT_STATUS_UNWRITTEN | \
				 EXTENT_STATUS_DELAYED | \
				 EXTENT_STATUS_HOLE)

#define ES_WRITTEN		(1ULL << 63)
#define ES_UNWRITTEN		(1ULL << 62)
#define ES_DELAYED		(1ULL << 61)
#define ES_HOLE			(1ULL << 60)

#define ES_MASK			(ES_WRITTEN | ES_UNWRITTEN | \
				 ES_DELAYED | ES_HOLE)

struct ext4_sb_info;
struct ext4_extent;

struct extent_status {
	struct rb_node rb_node;
	ext4_lblk_t es_lblk;	/* first logical block extent covers */
	ext4_lblk_t es_len;	/* length of extent in block */
	ext4_fsblk_t es_pblk;	/* first physical block */
};

struct ext4_es_tree {
	struct rb_root root;
	struct extent_status *cache_es;	/* recently accessed extent */
};

extern int __init ext4_init_es(void);
extern void ext4_exit_es(void);
extern void ext4_es_init_tree(struct ext4_es_tree *tree);

extern int ext4_es_insert_extent(struct inode *inode, ext4_lblk_t lblk,
				 ext4_lblk_t len, ext4_fsblk_t pblk,
				 unsigned int status);
extern void ext4_es_cache_extent(struct inode *inode, ext4_lblk_t lblk,
				 ext4_lblk_t len, ext4_fsblk_t pblk,
				 unsigned int status);
extern int ext4_es_remove_extent(struct inode *inode, ext4_lblk_t lblk,
				 ext4_lblk_t len);
extern void ext4_es_find_delayed_extent_range(struct inode *inode,
					ext4_lblk_t lblk, ext4_lblk_t end,
					struct extent_status *es);
extern int ext4_es_lookup_extent(struct inode *inode, ext4_lblk_t lblk,
				 struct extent_status *es);

static inline int ext4_es_is_written(struct extent_status *es)
{
	return (es->es_pblk & ES_WRITTEN) != 0;
}

static inline int ext4_es_is_unwritten(struct extent_status *es)
{
	return (es->es_pblk & ES_UNWRITTEN) != 0;
}

static inline int ext4_es_is_delayed(struct extent_status *es)
{
	return (es->es_pblk & ES_DELAYED) != 0;
}

static inline int ext4_es_is_hole(struct extent_status *es)
{
	return (es->es_pblk & ES_HOLE) != 0;
}

static inline unsigned int ext4_es_status(struct extent_status *es)
{
	return es->es_pblk >> ES_SHIFT;
}

static inline ext4_fsblk_t ext4_es_pblock(struct extent_status *es)
{
	return es->es_pblk & ~ES_MASK;
}

static inline void ext4_es_store_pblock(struct extent_status *es,
					ext4_fsblk_t pb)
{
	ext4_fsblk_t block;

	block = (pb & ~ES_MASK) | (es->es_pblk & ES_MASK);
	es->es_pblk = block;
}

static inline void ext4_es_store_status(struct extent_status *es,
					unsigned int status)
{
	es->es_pblk = (((ext4_fsblk_t)
			(status & EXTENT_STATUS_FLAGS) << ES_SHIFT) |
		       (es->es_pblk & ~ES_MASK));
}

extern void ext4_es_register_shrinker(struct ext4_sb_info *sbi);
extern void ext4_es_unregister_shrinker(struct ext4_sb_info *sbi);
extern void ext4_es_lru_add(struct inode *inode);
extern void ext4_es_lru_del(struct inode *inode);

#endif /* _EXT4_EXTENTS_STATUS_H */
Commit	Line	Data
c0677e6d ZL	1	/*
	2	* fs/ext4/extents_status.h
	3	*
	4	* Written by Yongqiang Yang <xiaoqiangnk@gmail.com>
	5	* Modified by
	6	* Allison Henderson <achender@linux.vnet.ibm.com>
	7	* Zheng Liu <wenqing.lz@taobao.com>
	8	*
	9	*/
	10
	11	#ifndef _EXT4_EXTENTS_STATUS_H
	12	#define _EXT4_EXTENTS_STATUS_H
	13
654598be ZL	14	/*
	15	* Turn on ES_DEBUG__ to get lots of info about extent status operations.
	16	*/
	17	#ifdef ES_DEBUG__
	18	#define es_debug(fmt, ...) printk(fmt, ##__VA_ARGS__)
	19	#else
	20	#define es_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__)
	21	#endif
	22
921f266b DM	23	/*
	24	* With ES_AGGRESSIVE_TEST defined, the result of es caching will be
	25	* checked with old map_block's result.
	26	*/
	27	#define ES_AGGRESSIVE_TEST__
	28
8e919d13 TT	29	/*
	30	* These flags live in the high bits of extent_status.es_pblk
	31	*/
3be78c73 TT	32	#define ES_SHIFT 60
	33
	34	#define EXTENT_STATUS_WRITTEN (1 << 3)
	35	#define EXTENT_STATUS_UNWRITTEN (1 << 2)
	36	#define EXTENT_STATUS_DELAYED (1 << 1)
	37	#define EXTENT_STATUS_HOLE (1 << 0)
fdc0212e ZL	38
	39	#define EXTENT_STATUS_FLAGS (EXTENT_STATUS_WRITTEN \| \
	40	EXTENT_STATUS_UNWRITTEN \| \
	41	EXTENT_STATUS_DELAYED \| \
	42	EXTENT_STATUS_HOLE)
	43
3be78c73 TT	44	#define ES_WRITTEN (1ULL << 63)
	45	#define ES_UNWRITTEN (1ULL << 62)
	46	#define ES_DELAYED (1ULL << 61)
	47	#define ES_HOLE (1ULL << 60)
	48
	49	#define ES_MASK (ES_WRITTEN \| ES_UNWRITTEN \| \
	50	ES_DELAYED \| ES_HOLE)
	51
d3922a77	52	struct ext4_sb_info;
adb23551 ZL	53	struct ext4_extent;
adb23551 ZL	54
c0677e6d ZL	55	struct extent_status {
c0677e6d ZL	56	struct rb_node rb_node;
06b0c886 ZL	57	ext4_lblk_t es_lblk; /* first logical block extent covers */
06b0c886 ZL	58	ext4_lblk_t es_len; /* length of extent in block */
fdc0212e	59	ext4_fsblk_t es_pblk; /* first physical block */
c0677e6d ZL	60	};
	61
	62	struct ext4_es_tree {
	63	struct rb_root root;
	64	struct extent_status cache_es; / recently accessed extent */
	65	};
	66
654598be ZL	67	extern int __init ext4_init_es(void);
	68	extern void ext4_exit_es(void);
	69	extern void ext4_es_init_tree(struct ext4_es_tree *tree);
	70
06b0c886	71	extern int ext4_es_insert_extent(struct inode *inode, ext4_lblk_t lblk,
fdc0212e	72	ext4_lblk_t len, ext4_fsblk_t pblk,
3be78c73	73	unsigned int status);
107a7bd3 TT	74	extern void ext4_es_cache_extent(struct inode *inode, ext4_lblk_t lblk,
	75	ext4_lblk_t len, ext4_fsblk_t pblk,
	76	unsigned int status);
06b0c886	77	extern int ext4_es_remove_extent(struct inode *inode, ext4_lblk_t lblk,
654598be	78	ext4_lblk_t len);
e30b5dca YZ	79	extern void ext4_es_find_delayed_extent_range(struct inode *inode,
e30b5dca YZ	80	ext4_lblk_t lblk, ext4_lblk_t end,
be401363	81	struct extent_status *es);
d100eef2 ZL	82	extern int ext4_es_lookup_extent(struct inode *inode, ext4_lblk_t lblk,
d100eef2 ZL	83	struct extent_status *es);
654598be	84
fdc0212e ZL	85	static inline int ext4_es_is_written(struct extent_status *es)
fdc0212e ZL	86	{
3be78c73	87	return (es->es_pblk & ES_WRITTEN) != 0;
fdc0212e ZL	88	}
	89
	90	static inline int ext4_es_is_unwritten(struct extent_status *es)
	91	{
3be78c73	92	return (es->es_pblk & ES_UNWRITTEN) != 0;
fdc0212e ZL	93	}
	94
	95	static inline int ext4_es_is_delayed(struct extent_status *es)
	96	{
3be78c73	97	return (es->es_pblk & ES_DELAYED) != 0;
fdc0212e ZL	98	}
	99
	100	static inline int ext4_es_is_hole(struct extent_status *es)
	101	{
3be78c73	102	return (es->es_pblk & ES_HOLE) != 0;
fdc0212e ZL	103	}
fdc0212e ZL	104
3be78c73	105	static inline unsigned int ext4_es_status(struct extent_status *es)
fdc0212e	106	{
3be78c73	107	return es->es_pblk >> ES_SHIFT;
fdc0212e ZL	108	}
	109
	110	static inline ext4_fsblk_t ext4_es_pblock(struct extent_status *es)
	111	{
3be78c73	112	return es->es_pblk & ~ES_MASK;
fdc0212e ZL	113	}
	114
	115	static inline void ext4_es_store_pblock(struct extent_status *es,
	116	ext4_fsblk_t pb)
	117	{
	118	ext4_fsblk_t block;
	119
3be78c73	120	block = (pb & ~ES_MASK) \| (es->es_pblk & ES_MASK);
fdc0212e ZL	121	es->es_pblk = block;
	122	}
	123
	124	static inline void ext4_es_store_status(struct extent_status *es,
3be78c73	125	unsigned int status)
fdc0212e	126	{
3be78c73 TT	127	es->es_pblk = (((ext4_fsblk_t)
	128	(status & EXTENT_STATUS_FLAGS) << ES_SHIFT) \|
	129	(es->es_pblk & ~ES_MASK));
fdc0212e ZL	130	}
fdc0212e ZL	131
d3922a77 ZL	132	extern void ext4_es_register_shrinker(struct ext4_sb_info *sbi);
d3922a77 ZL	133	extern void ext4_es_unregister_shrinker(struct ext4_sb_info *sbi);
74cd15cd ZL	134	extern void ext4_es_lru_add(struct inode *inode);
	135	extern void ext4_es_lru_del(struct inode *inode);
	136
c0677e6d	137	#endif /* _EXT4_EXTENTS_STATUS_H */